JP4798882B2 - Powder and particle feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a granular material supply device that supplies granular material from a storage unit to a target device. More specifically, the present invention provides a granular material supply device capable of stable supply and a wide control of the supply amount in a blasting device that supplies various granular materials from a reservoir to an injection nozzle. .
[0002]
[Prior art]
Various types of powder and particle supply devices from the storage unit have been known, such as those using a rotary valve or screw conveyor, and those supplied through two rollers in contact with each other. Has disadvantages. The present applicant has also proposed a screw screw type (Japanese Patent Laid-Open No. 11-254329). This method is suitable for relatively fine particles and allows fine adjustment of the flow rate, but has a limit that the supply amount of particles cannot be increased so much. Further, there is also disclosed one that collects and circulates a granular material from the gap between the granular material supply tube and the air supply tube (Japanese Patent Laid-Open No. 6-79630). In the case of this method, a large amount of powder particles can be recovered in the direction of coarse particles, but in the case of fine particles, the supply amount fluctuation due to pulsation becomes large, which is not suitable. In other words, since there is no moving part in this method, due to moisture or the like, the powder particles are in close contact with each other in the vicinity of the gap, resulting in a decrease in fluidity or fluctuation in flow rate, causing pulsation or blockage However, there was a technical problem that stable quantitative supply was hindered. This problem could not be solved by preventing a rathole by installing a stirring blade in the hopper or storage tank or applying vibration. In particular, once the gaps are clogged due to the formation of particles in the particles due to moisture, etc., or the particles adhering to the outer surface of the tube, since there is no drive unit, all the particles are discharged to break up the particles. The troublesome work that was required.
[0003]
[Problems to be solved by the invention]
As described above, the conventional powder supply devices each have advantages and disadvantages, and a stable and wide supply amount can be obtained for both fine and coarse particles. It has been difficult to find an easy-to-use powder supply apparatus. The present invention has been developed in view of such a state of the art, and can reliably eliminate problems caused by agglomeration of particles and the like, and can stably supply a wide range of quantitative quantities regardless of the particle size. An object of the present invention is to provide a powder and granular material supply device capable of performing the above.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention includes a powder supply pipe that opens into the powder storage section, and a gas supply pipe that is disposed between the powder supply pipe and an appropriate gap. In the granular material supply apparatus configured to send the granular material flowing from the gap into the granular material supply tube by a gas flow flowing from the gas supply tube to the granular material supply tube, the granular material Technical means was adopted in which a stirring member is rotatably provided on the outer periphery of the gas supply pipe or the granular material supply pipe so as to stir the gap between the supply pipe and the gas supply pipe or the vicinity thereof. By this technical means, the mass of the granular material in the vicinity of the gap is crushed and disintegrated and stirred by the rotating stirring member, so that the fluidity of the granular material in that portion is improved and a stable supply state is possible. Therefore, a stable and wide-ranging quantitative supply with little fluctuation is possible. Further, since the fluidity of the reduced granular material in the vicinity of the gap is improved, stable quantitative supply is possible even for those that are likely to be hardened. It is also integrally attached to the front Symbol stirring member the gas supply pipe or granular material supply pipe itself is configured to be rotatable. Furthermore, it is also possible to adopt a technical means in which at least one of the gas supply pipe and the granular material supply pipe is configured to be rotatable and an uneven portion is provided at an end of the rotatable tube. . By this technical means, the granular material around the tube including the vicinity of the gap can be gradually fluidized without adhering the granular material to the rotating tube. And it is also possible to supply stably little by little by the uneven | corrugated | grooved part of an edge part irrespective of the size of a particle diameter. The concavo-convex portion may be constituted by, for example, a parallel groove or a spiral groove. In addition, it cannot be overemphasized that you may comprise so that the clearance gap between the above granular material supply pipe | tube and a gas supply pipe | tube can be adjusted.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is suitable for a relatively low-pressure blasting apparatus that requires supply of a large amount of abrasive, and a blasting apparatus that involves changing the type and particle diameter of the abrasive, but is not limited thereto. It can be widely applied as a feeding device. The gas is generally air, but may be any gas that can function as a carrier gas for the granular material. Moreover, what was heated in order to improve the drying function of a granular material may be used. Regarding the rotating means of the agitating member, it may be configured to rotate by being attached to a gas supply pipe or a granular material supply pipe that is configured to be rotatable, or to supply the gas supply pipe or the granular material. You may comprise so that it may provide in the outer peripheral part of a pipe | tube via a bearing and it may rotate with the drive source provided separately. In addition, you may comprise so that a gas supply pipe | tube side may be rotated like the following examples, or you may comprise so that a granular material supply pipe | tube side may be rotated, those gas supply pipes and You may comprise so that both of a granular material supply pipe may rotate with a reverse direction or a speed difference. Further, the embodiment according to claim 1 and the embodiment according to claim 3 are combined, and an uneven portion is provided at an end of a gas supply tube or a granular material supply tube configured to be rotatable, and a gap between both tubes is provided in the tube. You may provide a stirring member so that a part or its vicinity may be stirred. Furthermore, both the gas supply pipe and the powder supply pipe can be configured to be rotatable, an uneven portion is provided at the end of one pipe, and a stirring member can be attached to the other pipe. Moreover, it is not necessary to make the pipe diameter of a gas supply pipe and a granular material supply pipe the same, and a narrower pipe | tube may be inserted in a thicker pipe | tube.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is a right side view of FIG. As shown in the figure, in this embodiment, several mm to between the granular material supply pipe 3 opened in the granular material storage part 2 formed in the lower part of the hopper 1 and the granular material supply pipe 3. The gas supply pipe 4 arranged through an appropriate gap G of about 10 mm is provided, and the gas supply pipe 4 side is configured to rotate. And it has the characteristics at the point comprised so that it could rotate by attaching the stirring member 5 so that the said gap | interval G might be enclosed by the gas supply pipe | tube 4 side. In this embodiment, the gas supply pipe 4 is rotatably supported by a bearing 6 such as a bearing, and is configured to be rotationally driven by a drive motor (not shown) via a pulley 7 and the like. A sprocket 8 is integrally formed on the pulley 7, and an appropriate number of gas supply pipes 4 arranged side by side via the chain 9 can also be configured to rotate at the same time. Moreover, it is also possible to comprise so that the rotation speed of the gas supply pipe | tube 4 can be adjusted by rotation control etc. of a drive motor. Further, the gas supply pipe 4 is connected to the gas introduction pipe 11 with the rotary joint 10 or the like interposed therebetween, and the introduction amount thereof can be adjusted by the valve 12. In the figure, 13 is a stirring blade disposed in the hopper 1, 14 is a heater for heating attached to the outer surface of the hopper 1, and 15 is a communication portion to the granular material storage unit 2 provided in the lower part of the hopper 1. is there. In the present embodiment, as shown in FIG. 3, the case where three powder body supply pipes 3 a to 3 c are provided is shown. In accordance with the three powder supply pipes 3a to 3c, the powder storage unit 2 disposed below the stirring blade 13 of the hopper 1 is also divided into three independent storage spaces. In each storage space, three sets of gas supply pipes 4 and stirring members 5 are arranged corresponding to the powder and granular material supply pipes 3a to 3c. The three granular material supply pipes 3 a to 3 c are linked to each other by the chain 9 and are configured to be driven to rotate simultaneously through the sprocket 8.
[0007]
The granular material supply pipe 3 is configured to be fixed by a tightening screw 18 of a fixing portion 17 installed on the wall portion 16 of the granular material storage unit 2, and the slide is made by loosening the tightening screw 18. By doing so, the gap G with the gas supply pipe 4 can be adjusted. The downstream side of the granular material supply pipe 3 is connected to an injection nozzle 19. In the injection nozzle 19, the granular material from the granular material supply tube 3 is injected together with the suction action when the pressurized gas supplied through the pressurized gas supply tube 20 is injected. . In this embodiment, a gas introduction pipe 21 is further connected in the middle of the granular material supply pipe 3 so that the amount of gas introduced can be adjusted by the valve 22. That is, when supplying a small amount of granular material, the supply amount can be reduced if the valve 12 is throttled, but if the amount is excessively reduced, the gas flow rate in the granular material supply pipe 3 is also reduced. Since the body is not transported to the injection nozzle 19 and is clogged in the tube, the gas flow rate in the granular material supply tube 3 can be adjusted by the valve 22. Needless to say, a pressurized gas can be supplied by connecting a compressor or the like to the other end of the gas introduction tube 11 as necessary.
[0008]
Thus, in this embodiment, the granular material stored in the hopper 1 is dried by the heater 14 while being stirred by the stirring blade 13, and sequentially passes through the communicating portion 15 to be in the lower granular material storing portion 2. Flow down. The granular material stored in the granular material storage part 2 flows into the granular material supply pipe 3 through a gap G formed between the granular material supply pipe 3 and the gas supply pipe 4. However, in that case, the gas flow flowing from the gas supply pipe 4 to the granular material supply pipe 3 acts so as to draw the granular material into the granular material supply pipe 3, and the granular particles of the granular material. Inflow into the body supply pipe 3 is promoted. Further, the gas flow flowing from the gas supply pipe 4 to the granular material supply pipe 3 functions as a carrier gas, and the conveyance of the granular material in the granular material supply pipe 3 to the target device such as the injection nozzle 19 is promoted. Is done. Basically, the setting relating to the supply amount of the granular material from the granular material supply pipe 3 to the target device is the tightening screw 18 of the fixing portion 17 installed on the wall portion 16 of the granular material storage unit 2. Is performed by sliding the granular material supply pipe 3 and adjusting the size of the gap G with the gas supply pipe 4. Further, the supply amount of the granular material can also be adjusted by adjusting the flow rate of the gas supply pipe 4 with the valve 12 or adjusting the flow rate of the gas introduction pipe 21 with the valve 22. That is, the supply amount of the granular material can be set by adjusting the size of the gap G between the granular material supply tube 3 and the gas supply tube 4, the flow rate of the gas supply tube 4, and the flow rate of the gas introduction tube 21. it can. In the case of a multiple configuration as shown in FIG. 3, the amount of powder supplied to each injection nozzle 19 is independently adjusted by each gap G, each valve 12, and each valve 22. it can. Thereby, even when a pressurized gas supply source is the same, the influence on the other injection nozzle 19 can be avoided. Moreover, it is also possible to comprise so that the rotation speed of each gas supply pipe | tube 4 can be adjusted independently by providing a drive motor with respect to each gas supply pipe | tube 4, respectively. Furthermore, it is also possible to perform air cleaning on the workpiece by fully closing the valve 12 to stop the supply of powder and injecting only the gas from the injection nozzle 19.
[0009]
As shown in the figure, in this embodiment, the inner surface of the end of the powder supply pipe 3 is chamfered in a tapered shape, and the outer surface of the end of the gas supply pipe 4 is chamfered in a tapered shape, and a gap G formed therebetween. Is formed in a tapered shape toward the inside of the powder supply pipe 3, the powder flowing in through the gap G is smoothly guided into the powder supply pipe 3. Further, since the stirring member 5 is attached to the gas supply pipe 4 so as to surround the gap G as described above, the gas supply pipe 4 is rotated via the pulley 7 continuously or intermittently or when necessary. As a result, the stirring member 5 rotates. By the rotation of the stirring member 5, the lump of the granular material in the vicinity of the gap G, the granular material attached to the outer surface of the granular material supply pipe 3 is crushed and broken, and the vicinity thereof is stirred. Therefore, troubles in which the gap G is blocked by a lump of the granular material or a granular material adhering to the outer surface of the granular material supply pipe 3 can be accurately solved, and the fluidity of the granular material in the vicinity of the gap G can be eliminated. Therefore, a stable supply state is maintained, and a stable and wide quantitative supply with little fluctuation is possible. In addition, since a stable supply state is possible even for those that are likely to be wet and easily lumpy, the range of application to the particle diameter is expanded. As shown in FIG. 4, the stirring member 5 is composed of a comb-like cylindrical body in which a plurality of parallel grooves 23 are formed.
[0010]
FIG. 5 is a sectional view showing the main part of the second embodiment of the present invention. This embodiment is a modification of the first embodiment, and is characterized in that a coil-like stirring member 24 is used instead of the stirring member 5 as shown in the figure. It is the same as that of an Example. This agitating member 24 is similar to the agitating member 5 in that the agglomerates in the vicinity of the gap G between the granular material supply pipe 3 and the gas supply pipe 4 and the powder adhered to the outer surface of the granular material supply pipe 3. Granules and the like are crushed and disintegrated, and have an effect of improving the fluidity of the granular material that has been lowered by stirring in the vicinity thereof.
[0011]
FIG. 6 is a cross-sectional view showing the main part of the third embodiment of the present invention, and FIG. 7 is a view taken along the line AA of the same embodiment. As shown in the figure, the present embodiment is characterized in that an uneven portion 26 is provided at the end of the gas supply pipe 25 itself configured to be rotationally driven in the same manner as in the above-described embodiment. As shown in FIG. 7, the concavo-convex portion 26 includes a spiral groove 27 formed in a spiral shape, and the granular material flowing into the gap G with the granular material supply pipe 28 is guided along the spiral groove 27. At the same time, the powder particles in the vicinity thereof are agitated. Therefore, the mass and adhering portion of the granular material in the vicinity of the gap G are crushed and broken, and the fluidity of the granular material is improved. In addition, in the case of the present embodiment, since the concavo-convex portion 26 is constituted by the spiral groove 27, when rotating in the normal rotation direction shown in FIG. It is actively sent into the body supply pipe 28. On the other hand, when the spiral groove 27 is rotated in the reverse rotation direction, it acts in a direction to exclude the powder particles to the outside. That is, when the spiral groove 27 is rotated in the reverse rotation direction, the granular material is subjected to an agitation action while being excluded to the outside, and through a gap near the granular material supply pipe 28 away from the spiral groove 27. Will flow in. From the above, in the case of the present embodiment, the inflow amount of the granular material from the gap G is adjusted by controlling the rotation speed and the rotation direction of the concavo-convex portion 26, that is, the spiral groove 27 via the gas supply pipe 25. It is also possible. In addition, it is also possible to comprise the said uneven | corrugated | grooved part 26 from a parallel groove. Furthermore, as another modification, a protrusion may be provided integrally on the outer peripheral surface of one or both ends of the gas supply pipe 25 or the powder supply pipe 28.
[0012]
FIG. 8 is a sectional view showing an essential part of a fourth embodiment of the present invention. In this embodiment, the stirring member 5 of the first embodiment is combined with the third embodiment. That is, the stirring member 5 is attached to the outer peripheral portion of the gas supply pipe 25 in addition to the concavo-convex portion 26 formed by the spiral groove 27 provided at the end of the gas supply pipe 25 itself. . In the case of the present embodiment, the action of the uneven portion 26 described above and the stirring action of the stirring member 5 can be combined to more reliably pulverize and disintegrate the lump or adhering portion of the granular material near the gap G. Thus, the fluidity of a wider range of powder particles is more reliably improved. Note that the rotational speed of the gas supply pipe 25 described above in the forward rotation or reverse rotation direction detects the supply amount of the powder flowing in the powder supply pipe 28 and compares the detected value with the set supply amount. Then, by closing the result to the rotation control of the drive motor that rotationally drives the gas supply pipe 25, closed loop control can be performed. It is also possible to measure the relationship between the rotation speed of the gas supply pipe 25 and the supply amount in advance and control the rotation speed according to the required supply amount. Furthermore, as described above, it is also possible to adjust the flow rate from the gas introduction tube 11 by the valve 12 and the flow rate adjustment from the gas introduction tube 21 by the valve 22 to adjust the supply amount of the granular material.
[0013]
【The invention's effect】
According to the present invention, the agitation member or unevenness of the rotating granular material or the mass of the granular material adhering to or near the gap portion between the gas supply tube and the granular material supply tube for flowing the granular material rotate Since crushing and disintegration is accurately performed by the part, clogging due to the adhering part of the granular material and the aggregation of the granular material is accurately eliminated, and the fluidity of the granular material in the gap or in the vicinity thereof is improved. The Therefore, stable quantitative supply is possible even in the case of fine particles that were difficult in the past, and stable and wide-ranging quantitative supply is possible regardless of the size of the particle size and the amount of supply. , Its applicable range can be expanded.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention.
FIG. 2 is a partially enlarged view showing a cross section of the main part of the first embodiment.
FIG. 3 is a right side view of FIG. 2;
FIG. 4 is a half sectional view showing a stirring member.
FIG. 5 is a cross-sectional view showing a main part of a second embodiment of the present invention.
FIG. 6 is a sectional view showing a main part of a third embodiment of the present invention.
FIG. 7 is an AA arrow view of the third embodiment.
FIG. 8 is a cross-sectional view showing a main part of a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hopper, 2 ... Granule body storage part, 3 ... Powder body supply pipe, 4 ... Gas supply pipe, 5 ... Stirring member, 6 ... Bearing, 7 ... Pulley, 8 ... Sprocket, 9 ... Chain, 10 ... Rotary Joint, 11 ... Gas introduction pipe, 12 ... Valve, 13 ... Stirrer blade, 14 ... Heater, 15 ... Communication part, 16 ... Wall part, 17 ... Fixing part, 18 ... Fastening screw, 19 ... Injection nozzle, 20 DESCRIPTION OF SYMBOLS ... Pressurized gas supply pipe, 21 ... Gas introduction pipe, 22 ... Valve, 23 ... Parallel groove, 24 ... Stirring member, 25 ... Gas supply pipe, 26 ... Irregularity part, 27 ... Spiral groove, 28 ... Granule supply pipe

Claims (6)

A granular material supply pipe that opens into the granular material storage unit, and a gas supply pipe that is disposed between the granular material supply pipe with an appropriate gap between the granular material supply pipe and the granular material supply pipe. the gas in the powder or granular material feeding apparatus of the granular material flowing from the gap and configured so as to go sent to the powder or granular material supplied pipe by the gas stream flowing, the stirring member to stir the gap or the vicinity thereof to A granular material supply device, wherein the granular material supply device is rotatably provided on the outer periphery of the supply tube or granular material supply tube . The granular material supply apparatus according to claim 1, wherein the stirring member is integrally attached to the gas supply pipe or the granular material supply pipe configured to be rotatable by itself.   A granular material supply pipe that opens into the granular material storage unit, and a gas supply pipe that is disposed between the granular material supply pipe with an appropriate gap between the granular material supply pipe and the granular material supply pipe. In the granular material supply device configured to send the granular material flowing from the gap into the granular material supply pipe by the gas flow flowing to the at least one of the gas supply pipe and the granular material supply pipe A powder and particle supply device characterized in that an uneven portion is provided at an end of a tube that is configured to be rotatable and configured to be rotatable. The granular material supply apparatus according to claim 3 , wherein the uneven portion is formed of a spiral groove. The granular material supply apparatus as described in any one of Claims 2-4 comprised so that adjustment of the rotation speed of the pipe | tube comprised so that rotation was possible was possible. The granular material supply apparatus according to any one of claims 1 to 5 , wherein the gap is configured to be adjustable.

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