JPH0443707B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an air-flow type crushing section, a classification section that separates the material to be processed from the crushing section into fine powder and coarse powder, and a The present invention relates to a crushing and classifying device provided with a conveying means for returning and supplying powder particles to the crushing section.

[Prior Art] Conventionally, the conveying means has been configured to be, for example, a dead weight drop type so that the entire amount of coarse powder from the classification section is immediately supplied to the air-flow crushing section [for example, Japanese Patent Application Laid-Open No. 1983-1992
-Refer to Publication No. 135052].

[Problem that the invention seeks to solve]

However, if the material to be processed is something difficult to crush, such as a metal, the amount of coarse particles from the classification section tends to increase, and if a large amount of coarse particles is immediately reduced and supplied from the classification section to the crushing section, The amount of reduced coarse powder particles that are difficult to crush rapidly increases, and the crushing efficiency due to the airflow in the crushing section is greatly reduced, and the airflow type crushing section is more likely to become clogged, leaving room for further improvement.

The purpose of the first invention is to prevent coarse powder particles from the classification section from being excessively supplied to the pneumatic crushing section, and to prevent operation failure due to an increase in the amount of reduced coarse powder particles. The point is to make it preventable.

An object of the second invention is to automatically and reliably achieve prevention of excessive supply of reduced coarse particles to the pneumatic pulverizer and prevention of inoperability due to an increase in the amount of reduced coarse particles.

[Means for solving problems]

The characteristic configuration of the first invention is that the conveying means for returning and supplying the coarse powder particles from the classification section to the pneumatic crushing section includes a retention section for coarse powder particles, a measuring means for measuring the amount of coarse powder particles in the retention section; In addition, a discharge means is provided to take out the excess coarse powder from the system, and its effects are as follows.

[Effect]

In other words, the coarse powder particles from the classification section are temporarily retained in the retention section and then fed to the airflow type crushing section in appropriate amounts by means of conveyance, so even if the amount of coarse particles from the classification section increases, the airflow type Excess reduced coarse powder particles are not supplied to the crushing section, and efficient crushing processing in the air flow crushing section can be reliably continued.

In addition, the amount of coarse particles in the retention area is detected by a measuring means,
If the detected amount exceeds the set amount and it becomes impossible to continue good operation due to the increase in the amount of coarse particles, the excess amount of coarse particles can be taken out of the system using the discharge means. It is possible to reliably prevent troubles in which operation becomes impossible due to an increase in the amount of powder particles.

〔Effect of the invention〕

As a result, it is possible to provide a crushing and classifying device that is even more superior in terms of versatility and performance, and can reliably continue efficient crushing over a long period of time, even for materials that are difficult to crush with air flow crushing, such as metals. It became like that.

[Means for solving problems]

In addition to the characteristic structure of the first invention, a characteristic configuration of the second invention includes a controller that automatically adjusts the amount taken out of the discharge means so as to maintain the measured value by the measurement means within a set range. The functions and effects are as follows.

[Effect]

In other words, as in the first invention, the action of the retention section can prevent excessive coarse powder from being returned to the pneumatic crushing section;
In addition, a measuring means, a controller,
Since it can be automatically maintained within the set range by the cooperation of the discharge means, it is possible to prevent operation failure due to an increase in the amount of coarse particles in a highly reliable state and advantageously in terms of management.

〔Effect of the invention〕

As a result, it has become possible to provide an extremely excellent pulverizing and classifying apparatus as a whole, which is excellent in versatility and performance as in the first invention, and even more excellent in terms of reliability and management.

〔Example〕

Next, an example will be shown with reference to FIGS. 1 and 2.

To form the pneumatic crushing section A, an annular collision surface 1
A ring 1 forming a casing 2 can be freely rotated.
A nozzle 4 is provided in the interior of the container and is configured to blow off the material to be processed from the fixed-rate raw material feeder 3 from a pressure gas jetting nozzle 4a toward the collision surface 1a with a high-speed airflow, thereby imparting an impact force by the high-speed airflow. The object to be processed is pulverized by application of impact force by the collision surface 1a.

As shown in FIG. 2, the nozzle 4 is arranged with respect to the collision surface 1a so that the object to be treated that bounces off the collision surface 1a revolves around the annular passage 5 around the ring 1, and the object to be treated is moved around the center P. It is configured so that it can be rotated.

The ring 1 is continuously rotated at a slow speed by a drive device,
Uneven wear of the ring 1 due to the object to be treated is prevented.

A cyclone type classification section B is provided below the crushing section A to separate the material to be processed, which falls while rotating from the crushing section A, into fine powder and coarse powder. An upward differential discharge passage 8 formed by a cylindrical body 7 whose vertical position can be freely adjusted is connected to the center of the classification chamber 6, and a conical discharge passage 8 is connected to the center of the classification chamber 6. The body 9 forms an annular coarse powder discharge passage 10.

In other words, the to-be-treated material falling from the annular passage 5 is separated into fine powder and coarse powder in the classification chamber 6 by inertial swirl flow, the fine powder is sent to the fine powder discharge passage 8 by air current conveyance, and the coarse powder is reduced to coarse powder by falling under its own weight. It is configured to be sent to a discharge path 10.

A swirling airflow chamber 11 extends around the entire outer circumference of the classification chamber 6.
The swirling airflow chamber 11 is connected to the entire circumference of the annular coarse powder discharge passage 10, and the gas that swirls in the swirling airflow chamber 11 as it is ejected from the air supply pipe 12 is coarsened in an inertial swirling flow state. The powder is configured to be supplied into the classification chamber 6 from the powder discharge path 10.

That is, the swirling air current blows up the fine powder in the coarse powder particles and sends it to the fine powder discharge path 8, and the fine powder can be transported by air current.

A fine powder collector 13 and an exhaust fan 14 are connected to the fine powder discharge path 8, and the fine powder transported by the airflow is transferred to the fine powder collector 1.
3, it is configured so that it can be separated and recovered from the gas.

A conveyance means C is provided to return and supply the coarse powder particles from the classification section B to the crushing section A, and to form the conveyance means C, a retention section 15 for coarse powder particles connected to the coarse particle discharge path 10 is formed. A hopper 16 is formed separately from the upper casing 3, and a load cell 17 for measuring the amount of coarse particles in the retention section 15 is provided at the support part of the hopper 16, and pressurization from the air supply path 18 is provided. Air flow conveying means 18 and 19 are separately formed and connected to the bottom of the hopper 16 for supplying the coarse powder that falls quantitatively from the hopper 16 with gas to the crushing section A through the pipe line 19. , a screw conveyor 20 is provided to take out excess coarse powder in the retention section 15 to the outside of the system, and a conical valve body 21 is provided to adjust the amount of coarse powder supplied from the hopper 16 to the air flow conveying means 18 and 19. It is provided. A sealing material 22a or 2 made of rubber, resin, cloth, etc. is installed between the casing 2 and the hopper 16, and between the hopper 16 and the air flow conveying means 18, 19, respectively.
2b is provided to prevent coarse powder particles from leaking out while enabling load detection by the load cell 17.

The electric motor M of the screw conveyor 20 is automatically operated based on the information from the load cell 17.
A controller 23 is provided to automatically open and close the valve _V1 of the conduit 19 in addition to the stop operation, and is configured so that the amount of coarse particles in the retention section 15 is automatically adjusted as follows. .

(a) When the measured weight W of the load cell 17 is less than the set lower limit value W ₁ at the start of operation.

The valve V ₁ is closed to stop the reduction supply of the coarse powder particles by the air flow conveying means 18 and 19, the screw conveyor 20 is stopped, and the coarse powder particles are retained in the retention section 15.

(b) When the measured weight W is greater than or equal to the set lower limit value W ₁ and less than the set upper limit value W ₂ .

The valve _V1 is opened to quantitatively reduce and supply the coarse powder to the crushing section A, and the coarse powder is re-pulverized, and the screw conveyor 20 is kept stopped.

(c) When the measured weight W exceeds the set upper limit value _W2 .

Valve _V1 is kept open and the screw conveyor 20 is operated to reduce the amount of coarse particles in the retention section 15 to below the set upper limit.

(d) When the measured weight W decreases to less than the set lower limit value _W1 .

The valve _V1 is kept open, the screw conveyor 20 is kept in a stopped state, and the process waits until the amount of coarse particles in the retention section 15 increases beyond the set lower limit.

In short, the amount taken out of the screw conveyor 20 is automatically adjusted by the controller 23 so that the value measured by the load cell 17 is maintained within a set range (W<W ₂ ).

[Another example]

Next, another embodiment will be described.

The specific configuration of the pneumatic crushing section A can be changed as appropriate, and for example, the following configuration can be used.

(a) The ring 1 is formed into a polygonal shape, or formed so that it can be rotated intermittently by driving force or artificial force. Further, instead of the ring 1, a fixed member is used to form the collision surface 1a.

(b) A plurality of nozzles 4 may be provided, or a dedicated nozzle for reducing coarse powder particles may be provided.

(c) The annular passage 5 is omitted.

The specific configuration of the classification section B can be changed as appropriate, and for example, the following configuration can be used.

(a) A screen and a rotatable classification impeller are installed at the entrance of the fine powder discharge path 8.

(b) A second classifier is added between the classification chamber 6 and the fine powder collector 13 to enable two-stage classification or multi-stage classification.

(c) The classification chamber 6 is arranged above or to the side of the crushing section A, and the material to be processed is sent from the crushing section A to the classification chamber 6 using a suitable transportation means such as an air flow transport pipe.

The conveying means C for reducing and supplying coarse powder particles can be appropriately modified in its system and specific configuration, and for example, the following configuration can be used.

(b) Use appropriate conveyors such as belt conveyors, bucket conveyors, screw conveyors, etc. singly or in combination.

(b) Adjust the vertical position of the valve body 21 using an air cylinder.
The valve body 21 may be configured to be operated by a suitable drive device such as a hydraulic cylinder or an electric motor, or by manual operation, or the valve body 21 may be fixed.

(c) Instead of the load cell 17, an optical means for detecting the level of the stored coarse particles or other suitable means for measuring the amount of coarse particles can be used, and these are collectively referred to as the measuring means 17.

(d) In place of the screw conveyor 20, it is possible to use a suitable means for taking out coarse particles, such as an air flow conveying pipe 24 with a valve _V2 shown in FIG. . Further, the coarse powder particles are transferred to the raw material feeder 3 by the discharge means 20 and 24.
It may also be configured so that it is reduced and supplied.

In the first invention, the brake device 23 is omitted,
A display for the measured value by the measuring means 17 may be provided, and the discharge means 20, 24 and the valve _V1 may be manually operated based on the display.

In the second invention, the operation mode of the discharge means 20, 24 by the controller 23 can be changed appropriately. For example, when the discharge means 20, 24 are of the air flow conveyance type as shown in FIG. The valve _V2 may be opened only when the value is above the set value to maintain the measured value below the set value.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a view taken along the - arrow in FIG. FIG. 3 is a sectional view showing another embodiment of the present invention. A...Crushing section, B...Classifying section, C...Transporting means, 15...Retention section, 17...Measuring means, 20,
24...Discharge means, 23...Controller.

Claims (1)

[Scope of Claims] 1. Airflow crushing section A, a classification section B that separates the material to be processed from the crushing section A into fine powder and coarse powder, and a classification section B that separates the coarse powder from the classification section B into the above-mentioned crushing section A. A pulverizing and classifying device is provided with a conveying means C for reducing and supplying
The conveyance means C includes a retention section 15 for coarse powder particles, a measuring means 17 for measuring the amount of coarse powder particles in the retention section 15, and a discharge means 2 for taking out an excess amount of coarse powder particles out of the system.
A crushing and classifying device equipped with 0,24. 2. Air flow crushing section A, a classifying section B that separates the material to be processed from the crushing section A into fine powder and coarse powder, and a conveying means for returning and supplying the coarse powder from the classifying section B to the crushing section A. A crushing and classifying device equipped with C,
The conveyance means C includes a retention section 15 for coarse powder particles, a measuring means 17 for measuring the amount of coarse powder particles in the retention section 15, and a discharge means 2 for taking out an excess amount of coarse powder particles out of the system.
0, 24, and the ejecting means 2
A crushing and classifying device equipped with a controller 23 that automatically adjusts the amount of 0 and 24 taken out.