JP2008063106A - Powder and granular material input device, and powder and granular material bridge preventing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powder and granular material input device, capable of smoothly supplying even a powder and granular material easy to consolidate such as a sponge blast medium from a storage part while preventing occurrence of a bridge phenomenon, and a powder and granular material bridge preventing method. <P>SOLUTION: In this device, inclined plates 36 and 38 are tiltably disposed within a connecting pipe 34 connecting the storage tank to a projection tank. The plates are tilted by motors 100 and 102 and controlled by a controller 104 so that the speed thereof is slow at the time of upward tiling, and a descending acceleration of the tips of the inclined plates 36 and 38 is a speed exceeding 1G at the time of downward tilting. Since the inclined plates 36 and 38 can give a force to the blast medium 40 at bottom positions thereof, consolidation of the blast medium 40 within the connecting pipe 34 can be prevented. Since occurrence of bridge within the connecting pipe 34 can be prevented according to this input device 26, the blast medium 40 can be smoothly supplied from the storage tank 28 to the projection tank. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a granular material charging apparatus and a granular material bridging prevention method, and in particular, a sponge piece-like blast medium (a granular material) in which an abrasive is fixed in a porous elastic body is transferred from a storage portion to a charging portion. TECHNICAL FIELD The present invention relates to an apparatus for charging powder and a method for preventing bridging of the powder.

  As a preliminary work when repainting the painted wall, blasting is performed by grinding the paint film on the wall and roughening the painted surface to adjust the substrate, but recently, instead of the sandblasting method, the abrasive material is porous. A so-called sponge blasting method using a piece of sponge blasting medium fixed in a material elastic body has attracted attention from the viewpoint of improving the working environment.

  According to this sponge blasting method, when the sponge blasting medium sprayed with high-speed air from the nozzle collides with the painted surface, the blasting medium becomes flat, and the mixed abrasive material directly collides with the painted surface at high speed. In addition, the coating film can be ground and removed. Further, since the generated dust is taken into the sponge, there is an advantage that the working environment is improved.

  By the way, the sponge blasting medium has a characteristic that many sponge blasting media consolidate into a lump because the sponge itself is sticky and has poor fluidity. For this reason, when the sponge blast medium stored in the storage tank (storage section) is put into the projection tank (input section) of the sponge blasting device, the sponge blast medium is connected in a connecting pipe that connects the storage tank and the projection tank. This causes a bridging phenomenon and a problem that the sponge blast medium cannot be smoothly put into the projection tank.

Patent Document 1 discloses a powder supply apparatus in which a large number of diaphragms are arranged in a hopper, and vibrations are applied to the powder in the hopper to prevent the bridge phenomenon from occurring. ing.
JP-A-9-253476

  However, when the powder supply device of Patent Document 1 using a vibration plate is applied to a powder and particle feeding device using a sponge blast medium, the sponge blast medium is compacted by the vibration, so that the reverse is true for the sponge blast medium. There was a drawback of being effective.

  The present invention has been made in view of such circumstances, and even if it is a powder body that is easily consolidated, such as a sponge blast medium, the occurrence of a bridging phenomenon is prevented and the powder body is introduced from the storage section. It is an object of the present invention to provide a granular material charging device and a granular material bridging prevention method that can be smoothly supplied to a section.

  In order to achieve the above object, the invention according to claim 1 is that the storage part in which the granular material is stored and the granular material stored in the storage part are dropped by the dead weight of the granular material. The charging unit, the storage unit, and the charging unit are connected to each other, and the connecting pipe through which the powder particles that fall are passed, and the connecting pipe are tiltably provided and pass through the connecting pipe. An inclined plate that contacts the granular material, a drive unit that tilts the inclined plate upward and downward, and a speed when the inclined plate is tilted downward by controlling the drive unit is higher than a speed when tilted upward And a control unit for controlling the descending acceleration at the tip of the inclined plate to a speed exceeding 1 G.

  According to the first aspect of the present invention, the mass of the granular material stored in the storage portion acts intensively at a predetermined position in the connecting pipe that connects the storage portion and the input portion, so that the granular material is fixed. Focusing on the phenomenon of tying, an inclined plate is tiltably arranged above the consolidation position, and the inclined plate is tilted by the drive unit, and the speed when tilting downward is controlled by the control unit. Control is faster than speed. That is, after the inclined plate is slowly inclined upward, the downward acceleration at the tip of the inclined plate is inclined downward at a speed (preferably about 2G) exceeding 1 G (gravity acceleration). As a result, the inclined plate acts like a “deer” made of bamboo cylinders and vigorously tilts downward, and force is applied to the granular material from the inclined plate at its lowest position. It is possible to prevent ligation, and even if the powder tends to consolidate, it can prevent the granular material from being compacted. Therefore, since bridge | bridging can be prevented as a result, a granular material can be smoothly supplied from a storage part to an input part.

  According to a second aspect of the present invention, in the first aspect, the connecting pipe is provided with a plurality of the inclined plates at a predetermined interval in the vertical direction. It is characterized by being synchronized and synchronized with the control unit.

  According to the invention described in claim 2, by arranging a plurality of inclined plates, a space is formed on the lower side of the inclined plate, and thereby the thickness in the height direction of the granular material sliding down along the inclined plate is increased. Since it becomes small, that is, the mass of the powder particles sliding down along the inclined plate can be reduced, consolidation can be prevented and the occurrence of bridges can also be prevented.

  According to a third aspect of the present invention, in the first or second aspect, the connection pipe is provided with a first air supply nozzle facing the inclined plate, and the connection pipe and the input portion are connected to each other. A second air supply nozzle is provided to face the horizontal opening surface.

  According to the invention described in claim 3, when the high-pressure air is sprayed from the first air supply nozzle to the powder particles sliding along the inclined plate, the powder particles are agitated in the air and charged into the charging unit. Is done. Thereby, since a granular material is isolate | separated separately and charged, solidification can be prevented reliably and generation | occurrence | production of a bridge | bridging can also be prevented reliably. Moreover, it can prevent that a granular material adheres to an inclination board by supplying the air from a 1st air supply nozzle so that the upper surface of an inclination board may be wiped. On the other hand, by supplying high-pressure air from the second air supply nozzle to the horizontal opening surface connecting the connecting pipe and the charging portion, the powder particles adhering to the vicinity of the horizontal opening surface due to the ejector effect are attracted to the charging portion. can do.

  According to a fourth aspect of the present invention, in the third aspect, the first air supply nozzle is provided in the connecting pipe so as to be adjustable in angle.

  According to the fourth aspect of the present invention, the angle with respect to the horizontal line is increased in the case of a granular material that is easily consolidated, and the angle with respect to the horizontal line is decreased in the case of a granular material that is difficult to consolidate.

  The invention of a method for preventing bridging of a granular material according to claim 5 is characterized in that the granular material charging device according to any one of claims 1, 2, 3 or 4 is used.

  According to the invention described in claim 5, the bridging phenomenon of the powder can be prevented by the powder input device according to claim 1, 2, 3 or 4.

  According to the granular material charging device and the granular material bridging prevention method according to the present invention, the inclined plate is tiltably disposed in the connecting pipe that connects the storage unit and the charging unit, and the inclined plate is tilted by the driving unit. At the same time, the control unit controls the speed when tilting downward to be higher than the speed when tilting upward, and the descending acceleration at the tip of the tilting plate is controlled to a speed exceeding 1 G, so that solidification of the granular material can be prevented, Moreover, even if it is consolidated, it can be loosened. Therefore, since bridge | bridging can be prevented as a result, a granular material can be smoothly supplied from a storage part to an input part.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a granular material charging device and a granular material bridging prevention method according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is an overall configuration diagram of a sponge blasting apparatus 10 to which the granular material charging apparatus according to the embodiment is applied.

  The sponge blasting device 10 includes a nozzle 12 that ejects a sponge piece-shaped blasting medium, a self-propelled collecting device 14 that sucks and collects the blasting medium ejected from the nozzle 12, and a blasting medium that is sucked and collected by the self-propelling collecting device 14. Solid-gas separation tank 16 that sorts into a reusable blast medium and a non-reusable blast medium, a blower 18 that applies a suction force to the self-propelled recovery device 14 via the solid-gas separation tank 16, and a suction force of the blower 18 The bag filter 20 that removes dust in the exhaust air exhausted from the solid-gas separation tank 16 by the air, the blower 24 that air-transports the reusable blast medium selected by the solid-gas separation tank 16 to the cyclone 22, and the cyclone 22 From a charging device (powder material charging device) 26 or the like for charging the blast medium separated by solid and gas by the nozzle 12 side for injection It is made.

  The input device 26 includes a storage tank (storage unit) 28 in which the blast medium from the cyclone 22 is temporarily stored, and two projection tanks (input units) 30 and 32 in which the blast medium stored in the storage tank 28 is input. The connecting tank 34 connects the storage tank 28 and the projection tanks 30 and 32. Further, inclined plates 36 and 38 are disposed in the connecting pipe 34 so as to be tiltable up and down. The charging device 26 will be described later.

  First, the sponge blasting method using the sponge blasting apparatus 10 will be described.

  The blasting medium used in this construction method is one in which a grinding material of a different material (steel grit, alumina, starlight, urea resin, etc.) is fixed to a sponge piece according to the application. It sprays on the coating film of the workpiece 42, grinds the coating film and roughens the painted surface to adjust the substrate.

  According to this sponge blasting method, when the blast medium 40 collides with the coating film, the blast medium 40 becomes flat and the fixed abrasive directly collides with the coating film at high speed. Thereby, a coating film can be ground like a sandblasting method. In addition, since dust that normally floats in the air is taken into the sponge piece and falls as it is, dust scattering can also be prevented. Further, since the repulsive force is also absorbed by the sponge piece, the blast medium 40 is rebounded very little.

  The solid-gas separation tank 16 includes a suction part 46 connected to the suction hose 44 of the self-propelled recovery apparatus 14, a suction part 46 and a tank body 48, and a vertical rise pipe 50 and a vertical rise pipe provided in the vertical direction. 50, the urethane plate 52 disposed opposite to the upper outlet, and the blasting medium 40 that has collided with the urethane plate 52 and has fallen in speed falls to vibrate the reusable blasting medium and the non-reusable blasting medium. And a reusable blast medium 40 take-out device 56 selected by the sieve 54, a non-reusable blast medium 40 take-out device 58, and the like.

  The used blast medium 40 sucked through the suction hose 44 is introduced into the suction part 46 which is the inlet of the solid-gas separation tank 16, and relatively large dust sucked together with the blast medium 40 is sucked. They are separated by a mesh (not shown) built in the unit 46. The blast medium 40 that has passed through the mesh is lowered in speed by moving up the vertical ascending pipe 50 by the suction force of the blower 18, and is jetted upward from the outlet of the vertical ascending pipe 50. As a result, the blast medium 40 collides with the urethane plate 52 to further reduce the speed, and is supplied to the solid-gas separation chamber 60 having a large volume of the tank body 48. Here, the blasting medium 40 falls below the final speed and falls freely, and falls on the sieve 54 installed in the solid-gas separation chamber 60.

  The inclination angle of the sieve 54 is set to an optimum angle according to various conditions such as the type of the blast medium 40 and the suction force of the blower 18. Further, a pressurized air type vibrator 62 is attached to a substantially central portion of the lower surface of the sieve 54, and the entire sieve 54 is vibrated by the vibrator 62. Therefore, the non-reusable blast medium 40 among the blast medium 40 that has fallen on the sieve 54 passes through the sieve 54 by the vibrating sieve 54 and falls on the hopper-shaped storage portion 64 formed below the sieve 54. Stored. Then, the rotary feeder 66 connected to the hopper-shaped storage portion 64 constituting the take-out device 58 is driven, and is discharged into the waste container 68.

  On the other hand, the reusable blast medium 40 of the blast medium 40 that has fallen on the sieve 54 falls along the vibrating sieve 54 without passing through the sieve 54 and is stored in a hopper-like storage provided at the rear stage of the tank body 48. It slides down to the part 70 and is stored.

  Since the blast medium 40 stored in the hopper-shaped storage unit 70 becomes a lump due to its own moisture, it cannot be supplied to the charging device 26 in this state. Therefore, in the embodiment, the take-out device 56 is dropped on the unwinding device 72 and is loosened finely here. The blast medium 40 loosened by the loosening device 72 is supplied to the positive pressure supply pipe 76 via the double damper 74, and is supplied to the cyclone 22 by the compressed air of the blower 24 connected to the positive pressure supply pipe 76. The air is conveyed toward.

  In addition, a part of the blast medium 40 dropped from the loosening device 72 is sent to the particle size measuring device 80 by opening the valve 78, where the particle size is measured, and the blast medium 40 Life expectancy is estimated.

  On the other hand, as shown in FIG. 1, the exhaust air exhausted from the solid-gas separation tank 16 by the suction force of the blower 18 is introduced into the bag filter 20 through a duct 82. Here, the waste air passes through the filters 84 and 84 of the bag filter 20 to remove dust of the blast medium, other dust, and the like contained in the exhaust air, and is released to the atmosphere.

  By the way, the blasting medium 40 conveyed by air to the positive pressure supply pipe 76 is charged into the cyclone 22 installed on the upstream side of the charging device 26, where it is separated from the air.

  The blast medium 40 separated from the air is stored in the storage tank 28 via double dampers 86 and 88 provided in the lower hopper of the cyclone 22.

  Switching to guide the blast medium 40 from the cyclone 22 to the two tanks 30 and 32 so that the blast medium 40 is put into one of the two tanks 30 and 32. The blast medium 40 stored in the projection tank 30 (32) is alternately switched between the valves 90 and 92 and the two projection tanks 30 and 32, and the blower 94 and the like are continuously supplied to the nozzle 12.

  As shown in FIG. 2, the charging device 26 according to the embodiment includes a storage tank 28, two projection tanks 30 and 32, a connecting pipe 34, two inclined plates 36 and 38, and a tilting motor (see FIG. 3: drive). Part) 100 and 102, and a motor controller (see FIG. 3: control part) 104 and the like.

  The blast medium 40 stored in the storage tank 28 falls due to the weight of the blast medium 40 and is put into the projection tank 30 or 32 of the switching valve 90 or 92 that is open among the switching valves 90 and 92.

  The connecting pipe 34 connects the storage tank 28 and the projection tanks 30 and 32 in the vertical direction, and the blast medium 40 falling from the storage tank 28 passes therethrough.

  The inclined plates 36 and 38 are disposed opposite to each other in the connecting pipe 34 while being shifted in height, and are provided so as to be tiltable via hinges 106 and 106. The inclined plates 36 and 38 are brought into contact with the blast medium 40 passing through the connecting pipe 34 by being tilted.

  The output shafts of the tilting motors 100 and 102 shown in FIG. 3 are connected to the rotating shaft of the hinge 106 so that power can be transmitted. These motors 100 and 102 are controlled by motor controller 104 to switch between forward and reverse rotations at a predetermined timing, so that the inclined plates 36 and 38 have a downward inclined position indicated by a solid line in FIG. It is tilted in conjunction with the upward tilt position indicated by. The inclined plates 36 and 38 are controlled by the motor controller 104 so that the speed when tilted upward is slow, and the speed when tilted downward is higher than the speed when tilted upward. The descending acceleration at the tips of 36 and 38 is controlled to a speed exceeding 1 G (preferably about 2 G).

  Next, the operation of the granular material charging device 26 configured as described above will be described.

  First, as shown in the schematic diagram of FIG. 5, the present invention provides the storage tank 28 with a predetermined position (position of the stacking height h) in the connecting pipe 34 that connects the storage tank 28 and the projection tanks 30 and 32. Paying attention to the fact that the mass of the stored blast medium 40 acts intensively to consolidate the blast medium 40, and the inclined plates 36 and 38 are disposed in a freely tiltable manner above the consolidation position as shown in FIG. The tilt plates 36 and 38 are tilted by the motors 100 and 102, and the controller 104 controls the speed when tilted downward to be higher than the speed when tilted upward, and the descending acceleration of the tips of the tilt plates 36 and 38 is 2G. To control.

  That is, after the inclined plates 36 and 38 are slowly inclined upward, the downward acceleration at the tips of the inclined plates 36 and 38 is rapidly inclined downward at a speed of about 2G. As a result, the inclined plates 36 and 38 act like a “deer” made of bamboo cylinders and vigorously tilt downward, and force is applied to the blast medium 40 from the inclined plates 36 and 38 at the lowest position. This operation prevents the blast medium 40 from consolidating at the consolidation position, and prevents the blast medium 40 from being compacted by the above-described tilting operation of the inclined plates 36 and 38 even if the blast medium 40 tends to consolidate on the upper side. it can. Therefore, according to the charging device 26, the occurrence of a bridge in the connecting pipe 34 can be prevented, and the blast medium 40 can be smoothly supplied from the storage tank 28 to the projection tanks 30 and 32.

Further, as shown in FIG. 3, the two inclined plates 36 and 38 are arranged at intervals above and below, so that spaces 108 and 108 are formed below the inclined plates 36 and 38. Thus, since the height direction of the thickness h ₁ of the blast media 40 to slide down along the inclined plate 38 decreases as shown in FIG. 4, i.e., it is possible to reduce the mass of the blasting medium 40 sliding down along the inclined plate 38 It is possible to prevent caking and to prevent the occurrence of bridging.

  FIG. 5 is a cross-sectional view showing another embodiment of the dosing device 126. In the charging device 126, air supply nozzles (first air supply nozzles) 128 and 130 are provided in the connection pipe 34 so as to face the inclined plates 36 and 38, and the connection pipe 34 and the projection tanks 30 and 32 are connected to each other. Air supply nozzles (second air supply nozzles) 136 and 138 are provided to face the horizontal opening surfaces 132 and 134.

  According to this charging device 126, when high-pressure air is sprayed from the air supply nozzles 128 and 130 onto the blast medium sliding along the inclined plates 36 and 38, the blast medium is agitated into the projection tanks 30 and 32. It is thrown. Accordingly, since the blast medium is separated and put in pieces, solidification can be surely prevented and occurrence of a bridge can also be reliably prevented.

  Further, by supplying air from the air supply nozzles 128 and 130 so as to wipe the upper surfaces of the inclined plates 36 and 38, the blast medium is prevented from adhering to the inclined plates 36 and 38 and causing a bridge. it can.

  On the other hand, by supplying high-pressure air from the air supply nozzles 136 and 138 to the horizontal opening surfaces 132 and 134 connecting the connecting pipe 34 and the projection tanks 30 and 32, the air supply nozzles 136 and 138 adhere to the vicinity of the horizontal opening surfaces 132 and 134 due to the ejector effect. The blasting medium can be attracted to the projection tanks 30 and 32.

  Further, these air supply nozzles 128, 130, 136, and 138 are attached to the connecting pipes via spherical bearings 140, respectively, and the injection angle can be adjusted. Accordingly, in the case of a blast medium that is easily consolidated, the angle with respect to the horizontal line is set to about 40 °, and in the case of a blast medium that is difficult to be consolidated, the angle with respect to the horizontal line is brought close to 0 °.

  Furthermore, by mounting the input devices 26 and 126 of the embodiment on the sponge blast device 10, the bridging phenomenon of the blast medium 40 that has occurred in the connecting pipe 34 can be reliably prevented.

  In the embodiment, the example in which the two inclined plates 36 and 38 are provided has been described, but one or three or more may be used.

  Moreover, a powder body is not limited to a sponge blast medium, It is applicable to a sand blast medium and other powder bodies.

Overall configuration diagram of the sponge blasting apparatus of the embodiment 1 is a longitudinal sectional view of a charging device applied to the sponge blasting device of FIG. Schematic diagram of the main part of the dosing device used to explain the mechanism that can prevent the bridging phenomenon Schematic diagram of the dosing device used to explain the mechanism by which the bridging phenomenon occurs Longitudinal sectional view showing another embodiment of the charging device to which the air supply nozzle is attached

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Sponge blasting device, 12 ... Nozzle, 14 ... Self-propelled collection device, 16 ... Solid-gas separation tank, 18 ... Blower, 20 ... Bag filter, 22 ... Cyclone, 24 ... Blower, 26 ... Dosing device, 28 ... Storage tank , 30, 32 ... projection tank, 34 ... connecting pipe, 36, 38 ... inclined plate, 40 ... blast medium, 90, 92 ... switching valve, 100, 102 ... motor for tilting, 104 ... motor controller, 108 ... space, 126 ... Loading device, 128, 130 ... Air supply nozzle, 132, 134 ... Horizontal opening surface, 136, 138 ... Air supply nozzle

Claims (5)

A reservoir for storing the powder,
An input unit that is charged by dropping the granular material stored in the storage unit by its own weight;
While connecting the storage unit and the input unit, a connecting tube through which the powder particles that fall,
An inclined plate that is provided in the connecting pipe so as to be freely tiltable, and is in contact with the granular material passing through the connecting pipe;
A drive unit for tilting the tilt plate upward and downward;
A control unit that controls the drive unit to control the speed when the tilt plate is tilted downward to be higher than the speed when the tilt plate is tilted upward, and to control the descending acceleration at the tip of the tilt plate to a speed exceeding 1G;
A granular material charging device characterized by comprising:   The connecting pipe is provided with a plurality of the inclined plates at a predetermined interval in the vertical direction, and the plurality of inclined plates are synchronized with each other by the driving unit and the control unit. The granular material injection | throwing-in apparatus of Claim 1 to do.   The connecting pipe is provided with a first air supply nozzle facing the inclined plate, and a second air supply nozzle facing the horizontal opening surface connecting the connecting pipe and the charging portion. The granular material charging device according to claim 1, wherein the powder particle charging device is provided.   The granular material charging device according to claim 3, wherein the first air supply nozzle is provided in the connecting pipe so as to be adjustable in angle.   A method for preventing bridging of a granular material using the granular material charging device according to any one of claims 1, 2, 3, and 4.

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