CN108828131B - Blanking mechanism and blanking method for elemental analyzer - Google Patents
Blanking mechanism and blanking method for elemental analyzer Download PDFInfo
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- CN108828131B CN108828131B CN201810525508.1A CN201810525508A CN108828131B CN 108828131 B CN108828131 B CN 108828131B CN 201810525508 A CN201810525508 A CN 201810525508A CN 108828131 B CN108828131 B CN 108828131B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 69
- 239000001301 oxygen Substances 0.000 claims abstract description 69
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 238000011010 flushing procedure Methods 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 210000001503 joint Anatomy 0.000 claims abstract description 19
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 238000012840 feeding operation Methods 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 16
- 239000003245 coal Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a blanking mechanism for an elemental analyzer, which comprises a fixed seat, wherein a sample falling channel penetrating through and abutting a sample tray and a test container for feeding is arranged in the fixed seat; the feeding opening and closing component is arranged on the feeding pipe, the feeding port is used for sealing the sample falling channel or enabling the feeding port of the sample falling channel to be in butt joint with the sample tray for feeding; and an oxygen flushing assembly for, when the sample falling channel is in butt joint with the sample tray for feeding, an upward flow of oxygen is established in the sample fall path to remove air entrained in the sample feed. The invention also discloses a blanking method based on the blanking mechanism for the elemental analyzer, which comprises the following steps: s01, firstly, closing a feed opening and closing assembly to seal a feed inlet of a sample falling channel; s02 the oxygen flushing assembly forms an upward blowing oxygen flow in the sample falling channel; s03 the feeding opening and closing assembly is opened to butt-joint a feeding port of the sample falling channel with the sample tray so as to carry out feeding operation. The mechanism and the method of the invention have the advantages of improving the test precision and the like.
Description
Technical Field
The invention mainly relates to the technical field of analysis of element content in combustible substances, in particular to a blanking mechanism and a blanking method for an element analyzer.
Background
The combustible material contains organic matters except partial mineral impurities and water. The organic substances in the coal mainly comprise carbon, hydrogen, oxygen, nitrogen, sulfur and other elements, which are one of indexes of coal scientific classification, and can also be used for calculating the calorific value of the coal, estimating and predicting the low-temperature carbonization products of the coal, thus being a basic basis for evaluating the combustible substance quantity. All measuring instruments for analysing the elemental content of combustible substances are collectively referred to as elemental analyzers.
At present, the sample falling port is not in a fully sealed state during sample falling, a combustion furnace is in contact with air during sample falling, and gases such as nitrogen, carbon dioxide and the like in the air during sample falling are brought into the combustion furnace along with the sample, so that accuracy of experimental results is affected.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a blanking mechanism and a blanking method for an elemental analyzer, which ensure a pure oxygen testing environment and improve testing precision.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a blanking mechanism for elemental analyzer includes
The fixing seat is internally provided with a sample falling channel which penetrates through and is connected with the sample tray and the test container in a butt joint manner so as to feed;
the feeding opening and closing assembly is arranged on the fixed seat and is used for sealing a feeding hole of the sample falling channel or enabling the feeding hole of the sample falling channel to be in butt joint with the sample tray for feeding; and
and the oxygen flushing assembly is used for forming upward blowing oxygen flow in the sample falling channel when the sample falling channel is in butt joint with the sample tray for feeding so as to discharge air carried during feeding of the sample.
As a further improvement of the above technical scheme:
the inside sample that falls of fixing base is provided with opens and close the subassembly for shutoff sample passageway when the feeding makes the sample shutoff in the sample passageway that falls so that oxygen washes the subassembly and carries out air cleaning, and opens the sample passageway that falls after wasing and so that the sample gets into in the test container.
The sample falling opening and closing assembly is arranged in an installation cavity of the fixed seat and comprises a pull rod, a baffle plate, an elastic piece, an electromagnet and a pull rod seat, one end of the pull rod is connected with the baffle plate, one end of the pull rod extends into the electromagnet, an annular step is arranged at one end of the pull rod, and the elastic piece is sleeved on the pull rod between the annular step and the electromagnet; the pull rod moves under the drive of the elastic piece to drive the baffle to extend into the sample falling channel so as to block the sample; one end of the pull rod seat extends into the other end of the electromagnet and attracts the pull rod to move when the electromagnet is electrified so as to pull the baffle out of the sample falling channel.
The elastic piece is a compression spring.
The oxygen flushing assembly comprises an oxygen source and an air source channel, and the air source channel is positioned in the fixing seat and used for communicating the oxygen source with the installation cavity.
The air source channel is connected with one end of the mounting cavity, which is far away from the sample falling channel.
The feeding start-stop assembly comprises a sliding block and a first driving piece; the sliding block is driven by the first driving piece to slide on the fixing seat, so that the piston seals the feeding inlet of the sample falling channel or the sample falling channel is in butt joint with the sample tray through the sample receiving hopper to perform feeding operation.
And a pressing component for driving the piston to move downwards to press and seal the feeding hole of the sample falling channel is arranged in the sliding block.
The sliding block is internally provided with a cavity for installing the piston, a sealing cavity is formed between the periphery of the piston and the cavity so as to form a sealing cavity between the piston and the cavity, the compression assembly comprises a nitrogen source, and the nitrogen source is communicated with the sealing cavity.
The feeding start-stop assembly comprises a sliding block and a first driving piece; the sliding block is driven by the first driving piece to slide on the fixed seat, so that the piston seals a feeding hole of the sample falling channel or the sample falling channel is in butt joint with the sample tray through the sample receiving hopper to perform feeding operation; the oxygen source is introduced below the piston to lift the piston and separate from the fixed seat so as to be convenient for moving.
A flow equalizing mechanism is arranged between the discharge port of the sample falling channel and the test container, and comprises a vent pipe communicated with an oxygen source, wherein the vent pipe comprises an inner ring and an outer ring, and the middle of the inner ring is in butt joint with the sample falling channel; the annular gap between the inner ring and the outer ring forms an annular air passage for enabling the air to form annular air flow; the upper portion of annular air flue is provided with the air inlet, the lower terminal surface opening of annular air flue forms annular gas outlet to stretch into in the test container.
The upper end face of the vent pipe is provided with a first pipe seat, and a first air inlet channel is arranged on the first pipe seat; the upper part of the vent pipe is provided with a second pipe seat in a ring manner, an L-shaped second air inlet channel is arranged on the second pipe seat, one end of the second pipe seat is connected with the first air inlet channel, and the other end of the second pipe seat is connected with the air inlet; the first tube seat is connected with the second tube seat through a fastener.
The invention also discloses a blanking method based on the blanking mechanism for the elemental analyzer, which comprises the following steps:
s01, firstly, closing a feed opening and closing assembly to seal a feed inlet of a sample falling channel;
s02, an oxygen flushing assembly forms upward blowing oxygen flow in the sample falling channel;
s03, the feeding opening and closing assembly is opened to butt joint a feeding hole of the sample falling channel with the sample tray so as to carry out feeding operation.
As a further improvement of the above technical scheme:
the specific process of the step S03 is as follows:
s31, blocking the sample falling channel during feeding to enable the sample to be blocked in the sample falling channel until feeding is completed;
s32, continuously working the oxygen flushing assembly until the air carried by the sample is cleaned when the sample falls off;
s33, closing a feed opening and closing assembly to seal a feed inlet of the sample falling channel;
s34, closing the oxygen flushing assembly, and conveying the sample blocked in the sample falling channel into the test container.
Compared with the prior art, the invention has the advantages that:
according to the blanking mechanism for the elemental analyzer, the feeding opening and closing assembly can seal the feeding port of the sample falling channel, so that the sample is ensured to be in a sealed environment and not influenced by external environment during testing, and the accuracy of a test result is improved; in addition, when feeding, the oxygen flushing assembly forms upward blowing air flow in the sample falling channel, so that air carried by the sample when falling is discharged from a feeding port above the sample, the sample is tested in a fully-sealed pure oxygen environment, and the accuracy of the test is further improved.
According to the blanking mechanism for the elemental analyzer, the sample falling opening and closing assembly is arranged on the fixed seat to catch the sample entering from the feeding port, and after the whole feeding of the sample is completed, the sample falling channel is subjected to oxygen flushing through the oxygen flushing assembly, so that the pure oxygen environment of the sample falling channel is ensured; and then the feeding port of the feeding opening and closing assembly is sealed, and the sample falling channel is opened to enable the sample to fall into the crucible, so that the pure oxygen tightness of the testing environment is ensured.
According to the sample falling method, when feeding, the oxygen flushing assembly forms upward blowing air flow in the sample falling channel, so that air carried by a sample when falling is discharged from the feeding port above, the sample is tested in a fully-sealed pure oxygen environment, and the accuracy of the test is further improved. When feeding, the sample falling from the feeding hole is received, and after the whole feeding of the sample is completed, the sample falling channel is subjected to oxygen flushing through the oxygen flushing assembly, so that the pure oxygen environment of the sample falling channel is ensured; then the feeding opening of the feeding opening and closing assembly is sealed, and then the sample falling channel is opened to enable the sample to fall into the crucible, so that the pure oxygen environment and the tightness of the testing environment are ensured.
Drawings
Fig. 1 is a schematic cross-sectional view of the initial state of the present invention.
FIG. 2 is a schematic cross-sectional view of the feed state of the present invention.
Fig. 3 is a schematic cross-sectional view of the blanking state of the present invention.
Fig. 4 is a schematic cross-sectional structure of the current equalizing mechanism in the present invention.
Fig. 5 is a schematic top view of the current equalizing mechanism in the present invention.
The reference numerals in the figures denote: 1. a sample tray; 2. a fixing seat; 201. a sample falling channel; 202. an air path; 3. a feed start-stop assembly; 301. a slide block; 302. a piston; 3021. a seal; 303. a receiving hopper; 304. a slide block fixing seat; 305. a first driving member; 306. a compression assembly; 3061. a nitrogen source; 4. a sample falling opening and closing assembly; 401. a pull rod; 402. a baffle; 403. an elastic member; 404. a pull rod seat; 405. an electromagnet; 406. installing a cavity; 5. an oxygen flushing assembly; 501. an oxygen source; 502. an air source channel; 6. a flow equalizing mechanism; 61. a vent pipe; 6101. an inner ring; 6102. an outer ring; 6103. a feed channel; 6104. an annular airway; 6105. an air inlet; 6106. an air outlet; 62. a first tube holder; 6201. a first air intake passage; 6202. a fastener; 63. a second tube holder; 6301. a second intake passage; 64. a seal assembly; 7. a gas-permeable crucible; 8. a U-shaped tube; 9. and (3) a sample.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
As shown in fig. 1 to 5, the blanking mechanism for elemental analyzer of the present embodiment is installed between a sample tray 1 and a test container (such as a crucible, etc.), and specifically comprises
A sample falling channel 201 which penetrates through the upper sample tray 1 and the lower test container from top to bottom and is used for feeding is arranged in the fixed seat 2, a feed inlet is arranged above the sample falling channel 201, and a discharge outlet is arranged below the sample falling channel 201;
the feeding start-stop assembly 3 is arranged on the upper end surface of the fixed seat 2 and is used for sealing a feeding hole of the sample falling channel 201 or enabling the feeding hole of the sample falling channel 201 to be in butt joint with the sample tray 1 for feeding; and
the oxygen flushing assembly 5 is used for forming upward blowing oxygen flow in the sample falling channel 201 to discharge air carried by feeding the sample 9 or air remained in the sample falling channel 201 when the feeding port of the sample falling channel 201 is in butt joint with the sample tray 1 for feeding.
According to the blanking mechanism for the elemental analyzer, the feeding opening and closing assembly 3 can seal the feeding port of the sample falling channel 201, so that the sample 9 is ensured to be in a sealed environment and not influenced by external environment during testing, and the accuracy of a test result is improved; in addition, during feeding, the oxygen flushing assembly 5 forms upward blowing air flow in the sample falling channel 201, so that air carried by the sample 9 during falling is discharged from a feeding hole above, the sample 9 is tested in a fully-sealed pure oxygen environment, and the testing accuracy is further improved.
In this embodiment, the fixing base 2 is internally provided with a sample opening and closing component 4, which is used for blocking the sample falling channel 201 during feeding so that the sample 9 is blocked in the sample falling channel 201, thereby facilitating the oxygen flushing component 5 to perform air cleaning, and opening the sample falling channel 201 after cleaning is completed so that the sample 9 enters the test container. The sample falling opening and closing assembly 4 is arranged on the fixed seat 2 to receive the sample 9 coming from the feeding inlet, and after the whole feeding of the sample 9 is completed, the sample falling channel 201 is subjected to oxygen flushing through the oxygen flushing assembly 5, so that the pure oxygen environment of the sample falling channel 201 is ensured; then the feeding opening and closing assembly 3 is sealed through the feeding opening and closing assembly, and then the sample falling channel 201 is opened to enable the sample 9 to fall into the crucible, so that the pure oxygen tightness of the testing environment is ensured.
As shown in fig. 1 to 3, in this embodiment, the sample falling opening and closing assembly 4 is mounted in a strip mounting cavity 406 of the fixing seat 2, and specifically includes a pull rod 401, an electromagnet 405, an elastic member 403 and a pull rod seat 404, wherein one end of the pull rod 401 is connected with a baffle 402, the other end of the pull rod 401 is inserted into the electromagnet 405, one end of the pull rod seat 404 is inserted into the other end of the electromagnet 405, one end of the pull rod 401 at the baffle 402 is provided with an annular step, and the elastic member 403 (such as a compression spring) is located on the pull rod 401 between the annular step and the electromagnet 405; when the electromagnet 405 is not electrified, the pull rod 401 moves rightward under the elasticity of the compression spring, so that the baffle 402 stretches into the sample falling channel 201 to catch the sample 9; when the electromagnet 405 is energized, the pull rod seat 404 generates magnetic force to attract the pull rod 401 to the right, so that the baffle 402 is pulled out of the sample falling channel 201, and the sample 9 falls down into the crucible.
As shown in fig. 1 to 3, in the present embodiment, the oxygen flushing assembly 5 includes an oxygen source 501 and a gas source channel 502, and the gas source channel 502 is located in the fixing base 2 and is used for communicating the oxygen source 501 with the mounting cavity 406. Wherein the air source channel 502 is connected to an end (point a in fig. 1) of the mounting cavity 406 away from the sample falling channel 201, so as to ensure that the mounting cavity 406 in communication with the sample falling channel 201 is also in a pure oxygen environment. Specifically, the oxygen source 501 and the gas source channel 502 are connected through a pipeline, and a pipe valve is arranged on the pipeline; when the oxygen source 501 and the pipe valve are opened, oxygen enters the installation cavity 406 after passing through the pipeline and the air source channel 502 in sequence, air in the installation cavity 406 passes through a gap between the pull rod 401 and the installation cavity 406, enters the sample falling channel 201 through a gap at the baffle 402, and is discharged upwards through the feed inlet.
As shown in fig. 1 to 3, in this embodiment, the feed start and stop assembly 3 includes a slider 301 and a first driving member 305 (such as a cylinder or an oil cylinder); a piston 302 and a receiving hopper 303 are arranged in the sliding block 301, the sliding block 301 slides on the upper surface of the fixed seat 2 under the drive of the first driving piece 305, so that the piston 302 seals the feeding hole of the sample falling channel 201 or the sample falling channel 201 is in butt joint with the sample tray 1 through the receiving hopper 303 to carry out feeding operation; i.e. the sample falling channel 201 is sealed during testing; during feeding, the sample falling channel 201 is in butt joint with the sample tray 1 through the receiving hopper 303, so that the quick switching between the sealing state and the feeding state is realized, and the device is simple in structure, convenient to operate and easy to realize.
In this embodiment, specifically, a cavity for installing the piston 302 is provided in the slider 301, the circumferential side of the piston 302 and the cavity are sealed by a sealing member 3021 (such as an O-ring) so as to form a closed cavity between the piston 302 and the inner wall of the cavity, and in addition, a sealing ring is also provided at the bottom of the piston 302, so as to ensure the sealing reliability of the feed inlet; a pressing component 306 for driving the piston 302 to move downwards to press the feeding hole of the sealing sample falling channel 201 is arranged in the sliding block 301, so that the sealing reliability is further improved; specifically, compression assembly 306 includes a nitrogen source 3061, wherein nitrogen source 3061 communicates with the closed cavity through an air hole (not shown) in slider 301. Wherein one side of slider 301 is provided with slider fixing base 304, and nitrogen gas source 3061 is linked together through the air flue of pipeline and slider fixing base 304, and when piston 302 is located the feed inlet position and seals the feed inlet, nitrogen gas source 3061 opens, and nitrogen gas gets into airtight cavity in proper order through pipeline, the air flue in the slider fixing base 304 to make piston 302 extrudeed downwards, in order to effectively seal the feed inlet. In addition, the fixing seat 2 is further provided with an air passage 202, one end of the air passage 202 is communicated with the mounting cavity 406, the other end penetrates through the fixing seat 2, and an opening of the air passage 202 is positioned between the piston 302 and the fixing seat 2; when the piston 302 needs to be unsealed, the nitrogen source 3061 is closed, and the oxygen source 501 is used for enabling gas to enter the lower surface of the piston 302 through the air channel, so that the piston 302 is lifted downwards, the piston 302 can slide along with the sliding block 301 conveniently, and damage to the sealing element 3021 when the sealing element 3021 below the piston 302 is prevented from being adhered to the fixing seat 2 and then moves left and right.
In this embodiment, a flow equalizing mechanism 6 is disposed between the discharge port of the sample falling channel 201 and the test container, and specifically includes a vent pipe 61 that is communicated with an oxygen source 501 (shared with the oxygen flushing assembly 5, or of course, may be independently disposed), where the vent pipe 61 includes an inner ring 6101 and an outer ring 6102, and a feed channel 6103 in the middle of the inner ring 6101 is in butt joint with the sample falling channel 201; the annular gap between the inner ring 6101 and the outer ring 6102 forms an annular gas flow 6104 for forming a gas into an annular gas flow; the upper part of the annular air channel 6104 is provided with an air inlet 6105, and the lower end surface of the annular air channel 6104 is opened to form an annular air outlet 6106 and extends into the test container (such as the air permeable crucible 7). Through an annular air passage 6104 formed by an inner ring 6101 and an outer ring 6102 in the vent pipe 61, the introduced gas forms annular air flow, the sample 9 in the middle of the annular air flow is isolated from the outside air, and the sample 9 is ensured to be fully combusted in a pure oxygen environment; the lower end of the vent pipe 61 is directly inserted into the ventilation crucible 7, so that the splashing of the sample 9 during sample adding can be avoided; in addition, the gas generated after the sample 9 is burnt is directly taken out from the bottom of the ventilation crucible 7 through the oxygen flow, so that the residue of experimental gas in the crucible can be avoided, and the experimental precision is improved.
In this embodiment, the upper end surface of the annular air passage 6104 is closed, and a plurality of air inlets 6105 are uniformly distributed on the peripheral side of the upper portion of the outer ring 6102.
In this embodiment, the upper end surface of the vent pipe 61 is provided with a n-shaped first pipe seat 62, the first pipe seat 62 covers the vent pipe 61, the first pipe seat 62 is provided with a plurality of first air inlet channels 6201, as shown in fig. 5, the first air inlet channels 6201 are uniformly distributed on the first pipe seat 62 in a ring shape; the upper part Zhou Cehuan of the breather pipe 61 is provided with a second pipe seat 63, an L-shaped second air inlet channel 6301 is arranged on the second pipe seat 63, one end of the second air inlet channel 6301 is connected with the first air inlet channel 6201, and the other end of the second air inlet channel is connected with the air inlet 6105, and the uniformity of air flow is ensured due to the adoption of a plurality of evenly-arranged air inlet channels; the first tube holder 62 and the second tube holder 63 are connected by a fastening member 6202 (such as a fastening screw), and as shown in fig. 5, the annular peripheral side of the first tube holder 62 and the second tube holder 63 are fastened by a plurality of uniformly distributed fastening screws. In addition, seal assemblies 64 (such as annular gaskets) are arranged between the first tube seat 62 and the outer ring 6102, and between the second tube seat 63 and the outer ring 6102, so as to ensure the tightness of the intake passage.
The main principle of the flow equalizing mechanism 6 is as follows: oxygen flows into the annular air passage 6104 of the vent pipe 61 through the first air inlet passage 6201 on the first pipe seat 62 and the second air inlet passage 6301 on the second pipe seat 63, then flows into the annular air passage 6104 of the vent pipe 61 through the air inlet 6102 on the peripheral side of the outer ring 6102 of the vent pipe 61, and the oxygen is uniformly diffused to the analysis sample 9 in the gas-permeable crucible 7 through the flow guiding of the annular air passage 6104, and forms an annular oxygen cover around the analysis sample 9 to isolate surrounding gas, so that the analysis sample 9 is fully contacted with oxygen and completely combusted, and the combusted gas of the analysis sample 9 is dispersed out through the bottom of the gas-permeable crucible 7 and flows into the test gas path, thereby reducing gas residues.
The invention also discloses a blanking method based on the blanking mechanism for the elemental analyzer, which comprises the following steps:
s01, firstly, the feeding opening and closing assembly 3 is closed to seal the feeding port of the sample falling channel 201;
s02, the oxygen flushing assembly 5 forms an upward blowing oxygen flow in the sample falling channel 201;
s03, the feeding opening and closing assembly 3 is opened to butt the feeding hole of the sample falling channel 201 with the sample tray 1 so as to perform feeding operation.
According to the sample falling method, when feeding, the oxygen flushing assembly 5 forms upward blowing air flow in the sample falling channel 201, so that air carried by the sample 9 when falling is discharged from the feeding hole above, the sample 9 is tested in a fully-sealed pure oxygen environment, and the accuracy of the test is further improved.
In this embodiment, the specific process of step S03 is as follows:
s31, blocking the sample falling channel 201 during feeding so that the sample 9 is blocked in the sample falling channel 201 until feeding is completed;
s32, the oxygen flushing assembly 5 continuously works until the air carried by the sample 9 is cleaned when the sample falls off;
s33 the feeding opening and closing assembly 3 is closed to seal the feeding port of the sample falling channel 201;
s34, closing the oxygen flushing assembly 5 and conveying the sample 9 blocked in the sample falling channel 201 into the test container.
When feeding, the sample 9 falling from the feeding hole is received, and after the whole feeding of the sample 9 is completed, the sample falling channel 201 is subjected to oxygen flushing through the oxygen flushing assembly 5, so that the pure oxygen environment of the sample falling channel 201 is ensured; then the feeding opening and closing assembly 3 is sealed through the feeding opening and closing assembly, and then the sample falling channel 201 is opened to enable the sample 9 to fall into the crucible, so that the pure oxygen environment and the tightness of the testing environment are ensured.
The sample dropping method is further described below by combining a blanking mechanism:
initial state before sample falling: the piston 302 in the slide block 301 is arranged at the position of the feed inlet, the nitrogen valve is opened, gas passes through the slide block fixing seat 304 and then enters a closed cavity formed by the slide block 301, the piston 302 and the sealing ring, and the air pressure presses the piston 302 downwards, so that the sealing ring at the bottom of the piston 302 seals the feed inlet to be isolated from the outside;
then the oxygen source 501 is opened, oxygen enters from the fixed seat 2 and then is divided into two paths, one path enters the interlayer of the vent pipe 61 and is diffused into the U-shaped pipe 8 outside the vent pipe 61, the other path enters the mounting cavity 406 through the air source channel 502, passes through the gap between the pull rod 401 and the mounting cavity 406, and then is diffused into the sample falling channel 201 through the gap at the baffle 402;
sample 9 feed status: the oxygen source 501 is continuously opened, the nitrogen valve is closed, the sealing state of the sealing ring at the bottom of the piston 302 and the upper surface of the fixed seat 2 is released, the cylinder drives the piston 302 in the sliding block 301 to move leftwards to a sample falling position, the sample 9 falls onto the baffle 402 in the sample falling channel 201 from the sample tray 1 through the receiving hopper 303, and in the process of deblocking the piston 302 and falling with the sample 9, oxygen forms continuous air flow, and the oxygen flows upwards into the external air from the baffle 402 of the sample falling channel 201, so that the external air is prevented from entering an experimental air path during sample injection;
sample 9 was dropped into the gas permeable crucible 7 state: the oxygen valve is continuously opened, air brought in when the sample 9 falls is flushed clean after the sample 9 falls, then the air cylinder drives the piston 302 in the sliding block 301 to move rightwards to an initial position, the nitrogen valve is opened, a sealing ring at the bottom of the piston 302 is sealed with a feed inlet, the electromagnet 405 is opened under the fully-sealed pure oxygen environment, the baffle 402 on the pull rod 401 moves leftwards, the sample 9 falls into the ventilation crucible 7 to be burnt, the electromagnet 405 is closed, the compression spring drives the baffle 402 on the pull rod 401 to reset, and sample falling is completed.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (11)
1. A blanking mechanism for elemental analyzer, characterized by comprising
A sample falling channel (201) penetrating and abutting the sample tray (1) and the test container for feeding is arranged in the fixed seat (2);
the feeding start-stop assembly (3) is arranged on the fixed seat (2) and is used for sealing a feeding hole of the sample falling channel (201) or enabling the feeding hole of the sample falling channel (201) to be in butt joint with the sample tray (1) for feeding; and
an oxygen flushing assembly (5) for forming an upward blowing oxygen flow in the sample falling channel (201) to discharge air carried by the feeding of the sample (9) when the sample falling channel (201) is in butt joint with the sample tray (1) for feeding;
the sample falling opening and closing assembly (4) is arranged in the fixed seat (2) and is used for blocking the sample falling channel (201) when feeding so that the sample (9) is blocked in the sample falling channel (201) to facilitate the oxygen flushing assembly (5) to perform air cleaning, and opening the sample falling channel (201) after the cleaning is finished so that the sample (9) enters the test container;
the flow equalizing mechanism (6) is arranged between the discharge port of the sample falling channel (201) and the test container;
the sample falling opening and closing assembly (4) is arranged in an installation cavity (406) of the fixed seat (2);
the oxygen flushing assembly (5) comprises an oxygen source (501) and a gas source channel (502), wherein the gas source channel (502) is positioned in the fixing seat (2) and is used for communicating the oxygen source (501) with the mounting cavity (406).
2. The blanking mechanism for an elemental analyzer according to claim 1, wherein the sample falling opening and closing assembly (4) comprises a pull rod (401), a baffle plate (402), an elastic member (403), an electromagnet (405) and a pull rod seat (404), one end of the pull rod (401) is connected with the baffle plate (402), one end of the pull rod (401) extends into the electromagnet (405), one end of the pull rod (401) at the baffle plate (402) is provided with an annular step, and the elastic member (403) is sleeved on the pull rod (401) between the annular step and the electromagnet (405); the pull rod (401) is driven by the elastic piece (403) to move so as to drive the baffle (402) to extend into the sample falling channel (201) to block the sample (9); one end of the pull rod seat (404) extends into the other end of the electromagnet (405) and attracts the pull rod (401) to move when the electromagnet (405) is powered so as to pull the baffle plate (402) out of the sample falling channel (201).
3. Blanking mechanism for elemental analyzer according to claim 2, characterized in that the elastic member (403) is a compression spring.
4. A blanking mechanism for an elemental analyzer according to claim 3 wherein the air supply channel (502) is connected to an end of the mounting cavity (406) remote from the sample dropping channel (201).
5. A blanking mechanism for an elemental analyzer according to any one of claims 1 to 3, wherein the feed start and stop assembly (3) comprises a slider (301) and a first drive member (305); the sliding block (301) is provided with a piston (302) and a receiving hopper (303), the sliding block (301) slides on the fixing seat (2) under the driving of the first driving piece (305), so that the piston (302) seals a feeding hole of the sample falling channel (201) or the sample falling channel (201) is in butt joint with the sample tray (1) through the receiving hopper (303) to perform feeding operation.
6. Blanking mechanism for elemental analyzer according to claim 5, characterized in that a compression assembly (306) is provided in the slide (301) for driving the piston (302) downwards for compressing and sealing the feed opening of the sample fall channel (201).
7. The blanking mechanism for an elemental analyzer as claimed in claim 6, wherein a cavity for mounting a piston (302) is provided in the slider (301), a circumferential side of the piston (302) is sealed from the cavity to form a closed cavity between the piston (302) and the cavity, and the compression assembly (306) includes a nitrogen source (3061), the nitrogen source (3061) being in communication with the closed cavity.
8. A blanking mechanism for an elemental analyzer according to claim 3, wherein the feed start and stop assembly (3) comprises a slide (301) and a first drive member (305); the sliding block (301) is provided with a piston (302) and a receiving hopper (303), the sliding block (301) slides on the fixed seat (2) under the drive of the first driving piece (305), so that the piston (302) seals a feeding hole of the sample falling channel (201) or the sample falling channel (201) is in butt joint with the sample tray (1) through the receiving hopper (303) to perform feeding operation; the air channel (202) is arranged in the fixed seat (2), one end of the air channel (202) is connected with the mounting cavity (406), and the other end of the air channel is positioned between the piston (302) and the fixed seat (2) and used for introducing an oxygen source (501) to the lower part of the piston (302) so as to lift the piston (302) and separate from the fixed seat (2) to facilitate movement.
9. A blanking mechanism for an elemental analyzer according to any one of claims 1 to 3, wherein the flow equalizer (6) comprises a vent pipe (61) in communication with an oxygen source (501), the vent pipe (61) comprising an inner ring (6101) and an outer ring (6102), the middle of the inner ring (6101) being in abutment with the sample drop channel (201); the annular gap between the inner ring (6101) and the outer ring (6102) forms an annular gas passage (6104) for forming a gas into an annular gas flow; the upper portion of annular air flue (6104) is provided with air inlet (6105), the lower terminal surface opening of annular air flue (6104) forms annular gas outlet (6106) to stretch into in the test container.
10. The blanking mechanism for an elemental analyzer according to claim 9, wherein an upper end face of the vent pipe (61) is provided with a first pipe seat (62), and a first air intake passage (6201) is provided on the first pipe seat (62); the upper part of the vent pipe (61) is annularly provided with a second pipe seat (63), an L-shaped second air inlet channel (6301) is arranged on the second pipe seat (63), one end of the second pipe seat is connected with the first air inlet channel (6201), and the other end of the second pipe seat is connected with an air inlet (6105); the first tube seat (62) and the second tube seat (63) are connected through a fastener (6202).
11. A blanking method based on the blanking mechanism for an elemental analyzer according to any one of claims 1 to 10, characterized by comprising the steps of:
s01, firstly, closing a feed opening and closing assembly (3) to seal a feed inlet of a sample falling channel (201);
s02, an oxygen flushing assembly (5) forms upward blowing oxygen flow in the sample falling channel (201);
s03, a feeding opening and closing assembly (3) is opened to butt joint a feeding port of the sample falling channel (201) with the sample tray (1) so as to perform feeding operation;
the specific process of the step S03 is as follows:
s31, blocking the sample falling channel (201) during feeding so that the sample (9) is blocked in the sample falling channel (201) until feeding is completed;
s32, continuously working the oxygen flushing assembly (5) until the air carried by the sample (9) is cleaned when the sample falls off;
s33, closing a feeding opening and closing assembly (3) to seal a feeding port of the sample falling channel (201);
s34, closing the oxygen flushing assembly (5) and conveying the sample (9) blocked in the sample falling channel (201) into the test container.
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| CN201810525508.1A CN108828131B (en) | 2018-05-28 | 2018-05-28 | Blanking mechanism and blanking method for elemental analyzer |
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| CN201810525508.1A CN108828131B (en) | 2018-05-28 | 2018-05-28 | Blanking mechanism and blanking method for elemental analyzer |
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| CN110164748B (en) * | 2019-06-21 | 2025-02-07 | 中国科学技术大学 | A sampling device |
| CN111003479A (en) * | 2019-12-20 | 2020-04-14 | 济南海能仪器股份有限公司 | Feeding slide block and full-automatic sample feeding device |
| CN115128203B (en) * | 2022-07-08 | 2024-08-16 | 北京捷思达仪分析仪器研发中心 | Automatic sample injection device for thermal cracking chromatograph |
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