JPS5863630A - Granular powder quantitative supply apparatus - Google Patents

Abstract

PURPOSE:To provide a quantitative supply apparatus which can supply granular powder by a constant weight from a measuring cylinder by loading transported granular powder on the measuring cylinder rotated coaxially with transporting means and directly detecting a change in weight to control the speed of revolution of the transporting means and the measuring cylinder. CONSTITUTION:A storing bath 25 for powder from a hopper is mounted on the upper portion of a shaft 22 rotated by a motor 23, the base thereof being connected to a quantitative cylinder 27. The cylinder 27 is adapted to quantitatively divide powder supplied from the storing bath and transfer same to be fed out from an outlet 30. A measuring cylinder 31 is adapted to keep the weight of powder transported from the cylinder 27 constant, while discharging powder. A load converter 49 is adapted to convert displacement in proportion to the weight of the cylinder 31 to an electric output by means of a strain gauge. The electric output is transmitted to the motor 23 to control the speed of the motor, so as to control the speed of revolution of the shaft 22 and a rotary table 31b. The rotation of the table 31b is controlled to keep constant the weight of powder discharged from the cylinder 31 to a take-out portion 48 per the unit hour.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quantitative feeding device for powder and granular material, in which the feeding device continuously supplies a constant weight of powder and granular material. The powder is transferred from the source by a rotating transfer means to a measuring tube that rotates coaxially with the source, the powder or granular material is directly weighed by this measuring tube, and the measured value is detected to control the rotational speed of the transfer means and measuring tube. , the supply weight of powder and granules is kept constant.

For example, in KTL, which synthesizes polyester, which is the raw material for polyester synthetic fibers, it is possible to continuously supply a reaction component and a reactant component made of a substance such as terephthalic acid to a reaction tank in a constant weight ratio and react little by little. It will be done. This means that the reaction components and reacted components are quickly mixed,
This is because the reaction temperature is also controlled in the container. In addition, when adding various additives to resin powder such as vinyl chloride resin, it is also possible to mix the additives efficiently by feeding the resin powder and additives little by little into a stirring tank and stirring and mixing. The test will be carried out.

This,') rc8. Conventionally, for example, a supply device shown in FIG. 1(a)K has been used to continuously supply i* in a constant amount. That is, the powder contained in the storage tank IK is stirred by the stirring blade 2 and guided to the guide cylinder 3,
Further, by sliding the output amount adjusting body 4 upward, the liquid is supplied onto the turntable 5.

The powder on the turntable 5 is sequentially scraped off by a scraper 6 after making one rotation, is supplied to a duct 8 through a chute 7, is conveyed by a belt conveyor 9 in this duct 8, and is discharged from an outlet 10 to the outside. Supplied. In addition, 11Fi casing and 12 are reduction gears.

By the way, in the above-mentioned apparatus, although the volume of powder discharged from the chute 7 can be kept constant,
look! For powders such as terephthalic acid, which have a large difference between the 1-line specific gravity and the true specific gravity, the powder may become clogged or coarsely clogged depending on the way the powder is filled in the storage tank IK, so use the chute as described above. Even if a constant volume of powder is discharged from the 7, the discharged weight per unit may vary. Therefore, the weight of the powder discharged from the chute 7 is measured. For example, as shown in Figure 1 (a) K, the chute 7 and duct 8 are
The duct 8 and the powder and the belt conveyor 9 are connected together by a scale 14 to facilitate vertical movement, and the weight of the powder to be taken out from the outlet 10 can be checked.

Then, based on this check, the reducer 12 is controlled,
The rotational speed of the turntable 5 is adjusted so that the weight of the powder supplied from the outlet 10 remains constant.

However, powder and granular materials, especially those such as terephthalic acid, which have thin particles and easily slip between each other, are supplied from the chute 7 to the duct 8 and further conveyed through the duct 8, in which case some of the particles may slip. Since the parts are suspended in the air, if the air flows under the influence of the operation of the belt conveyor 9, it will flow together with the air and behave as if it were a fluid. Furthermore, since this behavior varies depending on the surrounding conditions such as the air, the measured value also fluctuates, causing a measuring error.

Furthermore, since the powder adheres to the duct 8 and the belt conveyor 9, this also causes a measurement error. The problem with conveying such powder is that a screw shaft 9' is provided in the duct 8' as shown in FIG. However, this problem cannot be solved even when taking out from the crystal opening 1σ. In addition, in the apparatus shown in FIGS. These actions are because the response time until reaching the measured value becomes longer, and the control of the turntable 5, the result of that control, and the foot 9 are driven separately.

Therefore, in view of the present invention, as described above, the conventional powder supply device cannot accurately measure the continuously supplied powder, and in view of accurately controlling the supply of a constant weight of powder, these points have been modified. In order to improve the quality of the product, the powder and granules transferred by the transfer means are loaded onto a measuring tube that rotates coaxially with the transfer means, and changes in the weight of this measuring tube are directly detected to determine the rotational speed of the transfer means and the measuring tube. A measuring tube that enables control and has a compact structure.The measuring tube is loaded with C11 on one side, rotates, and discharges the loaded powder and granular material from the other side, and the powder and granular material loaded in this measuring tube. A load conversion means detects the weight and generates an electric output proportional to this weight, and the rotational speed of the measuring tube is controlled based on the detected value of the load conversion means to calculate the weight of the powder and granular material discharged per unit time. The transfer means and the measuring cylinder are driven on the same axis to sequentially transfer a fixed amount of powder or granules from the measuring cylinder to the needle measuring cylinder, and from this measuring cylinder, a constant weight of powder or granules is transferred from the measuring cylinder to the needle measuring cylinder. It is characterized by sequentially supplying.

Next, one embodiment of the present invention will be described based on FIGS. 2 to 5.

Figure 2 is a book! ! Fig. 3 is a sectional view of the device of one embodiment of the sensor, Fig. 3 is a sectional view of 11(-IIIa), Fig. 6144 is a sectional view of Fig. 3, and Fig. 5 is a plan view of the link device of the main device. ,!6 is a sectional view taken along the line Vl-VI in FIG. 5, and FIG. 7 is a diagram showing the control circuit of this device.

In FIG. 3, a shaft 22 is provided at the center of the machine base 21 in the vertical direction, and this shaft 22 is a trap that can be freely rotated via a transmission mechanism 24 by a motor 23 that is controlled by a circuit that will be described later. A cylindrical storage tank 25 with a bottom is provided at the upper part of the shaft 22, the bottom K1-1 of which passes through the shaft 22, and a stirring blade 26 is attached to the tip thereof. Further, a bottomed cylindrical metering tube 27 is connected to the bottom of the storage tank 25, and the two are communicated through a supply port 25a formed at the bottom of the storage tank 25. Metering tube 27
The method quantitatively separates and transports powder so that it can be measured in masses. This metering cylinder 27 is provided with a rotating blade 28 . That is, in this rotary blade 28, an annular body 2B is connected to an electromagnetic clutch 29 that can be freely engaged and separated, and the annular body 28aK, blades 28b, 28b, . . . are provided protruding radially at equal intervals. It is something. A large number of square-shaped sections are formed between the annular body 28m, the blades 28b, 28b, and the inner wall of the metering tube 27, and each section is provided with the above-mentioned space from the center and K around which the rotary blade 28 rotates. The powder supplied from the supply port 25m is divided into respective compartments and stored, and then transferred along with the rotation of the rotary vane 28, and sent out from the other side of the metering cylinder 27, for example, from the delivery port 30 shown in the second NK. It looks like this.

Further, 31 is a measuring cylinder. The measuring tube 31 is used to maintain the weight of the powder transferred from the metering tube 27 at a constant value while discharging the powder, and is designed as a trap so that the entire body moves up and down according to the amount of powder supplied. ing. This measuring tube 31
is composed of a bottomed cylindrical outer tube 31a and a rotary table 31b provided inside the outer tube 31a. The outer cylinder 31m has a shaft 22 loosely fitted into its bottom center hole, and a base plate 3 whose bottom part is supported and fixed to the machine base 21.
It is supported on the shaft 22 by springs 33 at three locations on the same circumference at equal intervals, and its upper end is closed by a cover plate 34 passing through the shaft 22.

The lid plate 34 is provided with an inlet port 34& opposite the outlet port 30, and the outlet port 30 and the inlet port 341L are connected by a flexible chute 35. This 7 lexipulchute 35 is connected to the metering cylinder 2.
It forms a passage for introducing the powder from 7.
The needle measuring cylinder 31 freely expands and contracts by vertical movement, and this expansion and contraction causes no vertical load on the measuring cylinder 31! It has no effect on On the other hand, the rotating Q and pull 31b are connected to a table plate 36 which is rotatably supported by a bearing part 31eK- at the center of the bottom of the outer cylinder 31a, and this tape plate 36.
A circle is provided at a distance from the inner wall of the outer cylinder 31m.
It is composed of a cylindrical inner tube 37, an outer tube 31 m,
An annular passage 38 is defined between the table plate 36 and the inner cylinder 37.

Rotary table: 11bti, the inner cylinder 37 and shaft 22 are linked to a link device 39 shown in FIGS. 5 and 6.
They are connected by , receive rotational force only in the horizontal direction, and can move freely in the vertical direction. That is, the ring 40 fixed to the shaft 22 and the inner cylinder 3
Arms 41, 42 are protruded at the same level position of each of the arms 41, 42, and cylindrical engagement protrusions 41m, 42 are protruded upward from each arm 41, 42, and these engagement protrusions A connecting piece 44 is connected to 41m and 42a by fitting rings 44a and 44a' formed at both ends thereof. The engagement protrusion 41m is connected to the ring 44 & 11
It is fitted tightly and rotatably, and is loosely fitted into the engaging protrusion 42 & 51, No. 1, No. 14, No. 14, No. 14, /, and when making contact, it is a line contact. It has become. In addition, 4
1.degree. 42 is formed to have a circular cross section so that the upper surface can be in line contact with the lower surface of the rings 44a, 44a.

・In addition, in FIG. 4, a discharge port 45 is provided at a position #de shifted by one rotation from the position corresponding to the inlet port 34a J/C on the side of the outer cylinder 31a. A baffle plate 46 is attached, and the rotary table 31b
The powder transferred by the rotation of is discharged from the discharge port 45 with the flow wI blocked by the baffle plate 46. In addition, 46' in FIG. 3 is an outer cylinder, a 31 m long anti-rotation bottle.

Further, 47 is a casing surrounding the needle metering tube 31. The discharge port 45 of this casing 47
A 1ft48 takeout is provided at a portion corresponding to the area.
・゛It is also a 49Fi load transformer. This load converter 49Fi converts the displacement of the measuring cylinder 31 supplied with powder, which is proportional to the load, into an electrical output using a strain gauge,
The pressure receiving portions 49& of the pressure receiving portions 49& are in contact with the outside of the bottom portion of the outer cylinder 31a. FIG. 7 shows two other load transducers 49'.

49' is shown. and these load converters 49
The electrical output of 4C1, 49' is transmitted to the motor (M) 23 according to the circuit shown in FIG. 7', and the speed of this motor 23 is controlled to adjust the rotation speed of the shaft 22. The rotation speed of the rotary table 31b is adjusted by K.

In the circuit shown in FIG. 7, a tacho generator 50 is connected to the motor 23 that drives the shaft 22, and a voltage EA generated by the tacho generator 50 is applied to a grounded resistor R. In addition, load converters 49 and 49' are provided at the three locations mentioned above.

49' is connected to the computing unit 51, and the respective output voltages are connected to this computing unit 5. It is added by l and becomes EB. This adder 51! A motor (m, ) 52 is connected to c, and this motor 52 rotates in proportion to the voltage EB, and 1c!
The contact 53 is rotated by one rotation, and the contact 53° is stopped by a distance tK corresponding to the resistance R. The above payment in VC seconds is divided according to EBk, so at point a, Em
A voltage of Ea is obtained. This voltage EAX El is transmitted to a comparator 54, which converts the power supply voltage E into a resistor R.
It is compared with the reference voltage Eo which is divided by 1. Then, the motor (ra) 55 rotates forward in proportion to the deviation voltage, and the rotary accumulator 56 is operated accordingly, and its output is further amplified by the amplifier 57. The speed ft of the induction motor - the number of revolutions as a controlled variable is obtained. This determines the rotation speed of the motor 23'.

Note that 58 is a power source.

Next, the operation of this embodiment will be explained.

First, powder is stored in a hopper (not shown) in the storage reservoir 25. Next, the rotation speed of the motor 2j is determined by manually operating the rotation speed setting device 5'6 in FIG. , the motor 23 is operated.This causes the shaft 22 to rotate, the stirring blade 26 to rotate, and the powder to be supplied to the metering tube 27, where it is limited to a constant volume.
Then, it is injected from the flexible chute 35 into the annular passage 38 of the metering cylinder 31. In the measuring tube 31-, the rotary table 31b is rotated by the shaft 22-, and the supplied powder is discharged from the outlet 45 by the baffle plate 46 and taken out from the take-out portion 48. In this manner, when the rotating gear 31b rotates at a constant speed, a constant voltage E
is generated from the tacho generator 50, and this EA is applied to the resistive island. - On three sides, the motor 52 is operated by the output from the computing unit 51, and the contactor 53 is connected to the resistance R.
8, thereby leaving points a, i E', and x EB. -This results in a voltage proportional to the powder flow rate. Here, assume that the position of the contactor 53 is adjusted in advance so that the current position is E, XEB key E. In this state, if powder is supplied to the measuring tube 31 with an apparent small specific gravity due to differences in the way the powder is packed, that is, with a light weight per constant volume, then the load converters 49, 49 ' , 49
Since the weight value detected in ' becomes small, the output of the computing unit 51 becomes small, and the motor 52 is operated thereby.
The contact 53 moves to the ground side. This result EAxEB
ii become smaller. If this is made lower than the reference voltage ER, the motor 55 is activated, the rotation speed setting unit 56 is activated, and the frequency from the amplifier 57 is made higher than before.
The rotation speed of the motor 23 increases. This increases the voltage generated by the tacho generator 50. On the other hand, although more powder is supplied to the rotary table 31b, the amount discharged at the same time also increases, so the load converters 49, 49'.

The detected value 49' does not vary depending on the rotational speed of the rotary table 31b. As a result, EA xEl becomes larger than before, and the difference between EA x EB and the island becomes smaller.

Then, due to this deviation voltage, the motor 2
The speed of 3 is increased, but since EAxEB becomes larger than K, it approaches EIL even more. This is repeated until EAX El = gR. When K is reached like this, the monitor 23Fi becomes constant speed, and the amount of powder discharged increases more than before. In this case, the rotational speed of the percentage meter 23 is controlled so that the apparent specific gravity of the supplied powder is compensated for by the rotational speed of the rotary table 31b and the discharge weight per unit time is constant. do.

In contrast to the above, when a powder having a large specific gravity and a large weight per constant volume is supplied to the rotary table 31bK,
Unlike the above, since the output of the reverse pressure calculator 51' becomes larger, the contact '53Fi moves to the side opposite to the ground. This is EAxE4ti larger than K. Since this is larger than E, contrary to the above, the rotation setting device 56 is operated by the motor 55 to decrease the rotation speed, and the rotation speed of the motor 23' is decreased. This will give Takojiene one ta (TG)
The output voltage from 50 will be smaller than before EAxEB. The same thing is repeated and EAX E
B=E.

As a result, the rotary table 31b is slowed down, the amount of powder discharged is reduced, and the apparent variation in specific gravity is compensated for by the amount of discharge, so that the amount of discharged powder is controlled to be constant. I'm in the middle of the day.

Next, another embodiment will be described based on FIG.

FIG. 8 shows a measuring tube 31' corresponding to the measuring tube 31 in FIG.
The same symbol indicates the same component. In the figure, 31b' is a rotor blade, and this rotor blade 3
11 (H1) Of the configuration of the rotary table 31b shown in FIG. ', and vane plates 59, 59, etc., like the rotating blades 28, are provided radially at regular intervals on this inner cylinder 31. Also, 60 is a discharge port, The outlet 60 is provided at the bottom of the outer tube 311L at a position corresponding to the baffle plate 461C shown in FIG. 4.The measuring tube 31' configured in this way does not require the baffle plate 46 shown in FIG. As explained in the previous embodiment, the powder supplied from the inlet 34a is transferred by the rotation of the rotary blade 31b' and is discharged from the outlet 60. In this way, the powder supplied from the inlet 341L is The powder is taken off as weighed in a mass, while the weight of the measuring tube 31' is transferred to the load transducer 49-.49'.

4g, the rotation of the measuring tube 31b' is controlled according to the rotation times wrK shown in FIG. 7, and the weight of the powder supplied is controlled to be constant.

In addition, in any of the above embodiments, the load converter 49
, 49', When performing zero adjustment of the 4-seat, disconnect the electromagnetic clutch 29 from the rear shaft 22 and remove the rotary table 3.
1b or I'a (can be adjusted by discharging all the powder from the bottom).

Furthermore, although the flexible chute 35 was used in the above embodiment, if the outlet port 30 and the inlet port 34m are placed close to each other,
The powder can be smoothly transferred to the rotary table 31b.

Further, in the link device 39, the engaging protrusion 41a is brought into close contact with the resig 44a', but it may be moved away.

As explained above, according to the present invention, the powder and granules are sequentially transferred by the transfer means, and the transferred powder and granules are placed on the measuring tube KMM which is driven by the same axis as the transfer means. A load converting means is provided to detect the weight value of the powder to be sequentially supplied from this measuring tube, and based on this, the (b) of the measuring tube is
Since the transfer control is carried out, the transferred powder is guided to the measuring tube through the shortest distance to reduce the influence of air behavior on the powder and granules.Moreover, the load conversion means with high detection accuracy allows the transfer of powder to be guided to the measuring tube over the shortest distance. can directly detect weight changes. Based on this detected value, the rotation control of the transfer means and the measuring tube for transferring the powder or granular material is performed on the same axis, which makes the control easier. Further, since the transfer means and the measuring tube can be assembled in advance into a compact structure using the same mechanism, the actual installation work is also easy.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional quantitative supply device for powder and granular materials, a plan view of an apparatus according to an embodiment of the present invention, and Fig. 3 is a sectional view of a conventional quantitative supply device for powder and granular materials.
-■ Line sectional view, Figure 4 Company Figure 3 ■-1V line sectional view, Figure 5
The figure is a plan view of the link device of this device, and Figure 6 is its ■-V
lli! #A side view, Figure 7 is a diagram showing the control circuit of this device,
158m is a diagram showing a main part of another embodiment of the present invention. , In the figure, l, 25 are storage tanks 1, 2, 26 are stirring blades, 3t
lGuidance 4. 5 is the output adjustment body, 5 is the turntable 1.6
is a scraper, 7 is a chute, 8.8' is a duct, 9 is a belt conveyor, 9' is a sleeve screw shaft, 10 is an outlet, 11.47 is a casing, 12 is a reducer, 13F
i flexible tube, 21 is machine base, 22#i shaft, 23 is motor (M), 24 is before transmission, 25a#i
Supply port, 27 is a metering cylinder, 28 is a rotating blade, 28& is an annular body, %28bFi blade, 29 is an electromagnetic clutch, 30 is a delivery port, 31.31' is a measuring cylinder, 31m is an outer cylinder, 31b
is a rotary table, 3l b'R rotary blade, 31c is a bearing part, 32 is a base plate, 33I/i spring, 34Fi is a cover plate, 34a is an inlet port, 35#i flexible chute,
36 is a table plate, 37 and 37' are inner cylinders, 39 is a link device, 40t:1 ring, 41.42Fi arm,
41a, 42 are engagement protrusions, 44 is a connecting piece, 44 m
, 44 a' is phosphorus. 45.60 is the discharge port, 48tj extraction 1 part, 49°4
d, 4f is a load converter, 50Fi tachometer generator (T
Gλ5] is a computing unit, and 52 is a motor (m, ). 53 #i contact, child, 54 I/i comparator, 55 is motor (
- input 56 #i rotation speed setting device, 57 is an amplifier, 58 is a power supply, Rs, Rt are resistors, EFi power supply voltage, EAti tachogenerator output voltage, El is the output voltage of the arithmetic unit,
EIll is the reference voltage, 59 employee board. October 8, 1981 Inventor: Toshiyuki Hayashi Patent applicant: Eikioie Tsune, Toshiyuki Hayashi; Figure 8

Claims (1)

[Claims] (1) A storage tank for powder and granular material, a metering cylinder that has a rotating transfer means and divides the powder and granular material continuously supplied from the storage tank into fixed volumes and sequentially transfers them, and this metering cylinder. A measuring cylinder which is sequentially supplied with the transferred powder and granular material, which is sequentially loaded with the supplied powder and granular material from one side, rotates, and discharges the loaded powder and granular material from the other side, and this measuring cylinder. a load conversion means that detects the weight of the powder and granules loaded on it and generates a good electrical output in proportion to this weight; The apparatus further comprises a control means for keeping the weight of the powder and granules discharged per unit time constant, and the transfer means and the measuring cylinder are driven on the same axis to measure a constant volume of powder or granular material t--next from the measuring cylinder. A quantitative supply device for powder and granular material, characterized in that the powder and granular material is transferred to a cylinder and is primarily supplied with a fixed weight of powder and granular material from this measuring cylinder.