JPH0516073A - Blasting device - Google Patents

Abstract

PURPOSE:To prevent blinding of a filter plate by providing a filter plate for filtering the burr horizontally in an oscillation type filter container provided continuously to the lower part of a blast chamber, and forming a burr exhaust port in the peripheral wall of the filter container just over the filter plate, and connecting the lower part of the filter container to an abrasive recovery pipe. CONSTITUTION:A filter container 20 of an oscillation type filter element 9 is provided continuously to the hoper-shape lower end of a blast chamber 5. A filter plate 22 is arranged horizontally in the filter chamber 20 to filter the abrasive and the burr. A burr exhaust port 24 is formed in the peripheral wall of the container 20 just over the filter plate 22 to exhaust the separated burr to the outside of the container 20. The lower part of the container 20 is connected to an abrasive recovery pipe 10, and while a bypass pipeline 28, which passes through the central part of the container 20 and of which upper end is communicated with the blast chamber 5 and of which lower end is communicated with the abrasive recovery pipe 10, is provided. With this structure, pressure inside of an abrasive storage chamber 4 is set at a negative pressure by a suction blower 16 to suck the burr, which is filtered for elimination, with the negative pressure for recovery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blasting device, and more specifically, while continuously operating the blasting device, it removes unnecessary dust such as burrs that are scraped from the work by the blasting process and mixed into the abrasive material. The present invention relates to a structure that can be effectively removed from the abrasive.

[0002]

2. Description of the Related Art A blast treatment carried out by placing a granular cleaning agent on a high-speed air stream and jetting it from a blast nozzle is used to form an underlayer of metal material, satin finish, or
It is widely used for deburring resin molded products and metal molded products. As the abrasive material, those having various hardness and various particle diameters are appropriately selected according to the kind of the work, the purpose of the blast treatment, and the like. This type of blasting device includes a blast chamber and a blast nozzle arranged in the blast chamber. The blast nozzle has an air supply hose introduced from an external air supply source and a blast chamber. A polishing / cleaning material supply hose for supplying the polishing / cleaning material from the polishing / cleaning material storage chamber provided in the upper part is connected. Then, when a high-speed air flow is introduced from the air supply hose, inside the blast nozzle, the polishing / cleaning material supplied from the polishing / cleaning material supply hose is mixed with the air flow and is jetted from the nozzle tip. There is.

For example, in a blasting device for deburring a molded product, when continuously deburring the molded product, a work conveyor is arranged in a penetrating manner in the blast chamber. The blast nozzle is configured to inject a high-speed air stream mixed with a polishing and cleaning material toward a workpiece that is continuously carried into the blast chamber by riding on the. The abrasive cleaning material sprayed from the blast nozzle and working on the workpiece and then falling to the lower part of the blast chamber is usually collected in the abrasive cleaning material storage chamber and used for circulation. The polishing / cleaning material dropped to the lower part of the blast chamber is sucked into the polishing / cleaning material recovery pipe by using a negative suction pressure, and is transported to the polishing / cleaning material storage chamber to be recovered.

By the way, when the deburring process of the above-mentioned molded product is performed by blasting, the burrs scraped from the work by the blasting material sprayed from the blast nozzle are mixed with the blasting material and fall to the lower part of the blast chamber. To do. When the abrasive cleaning material with such burrs mixed in is circulated,
Such burrs cause inconveniences such as clogging in the blast nozzle and clogging in the abrasive cleaning material conveyance path. In addition, the hard burr is sprayed onto the work together with the abrasive, which causes a problem that the work is scratched. Therefore, it is necessary to remove burrs mixed in the abrasive.

Conventionally, the simplest structure attached to remove unnecessary substances such as burrs mixed in the abrasive material in the blasting device is such that only the abrasive material can be transmitted to the lower part of the blast chamber. The mesh plate has a mesh or a punching metal or the like having a large number of through holes that allow only the cleaning material to pass therethrough. In the case of a configuration in which such a mesh plate or a sieving plate such as punching metal is provided, the sieving plate is slidably attached to the lower part of the blast chamber. When such a sieving plate is provided, burrs mixed in the polishing and cleaning material are sieved by the sieving plate, and only the polishing and cleaning material passes through such a sieving plate and is circulated and used.

[0006]

However, during continuous operation of the blasting device, the amount of burrs accumulated in the shape of the sieving plate gradually increases, and eventually even the abrasive material becomes difficult to permeate. Therefore, it is necessary to stop the operation of the blasting device itself at regular intervals, pull out the pull-out type sieve plate to the outside, and discharge the burr accumulated on it. For this reason,
The continuity of the continuous deburring device is impaired, the deburring efficiency is reduced, and manpower is required to discharge the burrs on the sieve plate as described above at regular intervals, resulting in good workability. Not really.

The present invention has been devised under the above circumstances, and solves the above-mentioned problems of the prior art and automatically removes the abrasive material without impairing the continuity of the operation of the blasting device. It is an object of the present invention to provide a new blasting device configured to effectively discharge mixed burrs and prevent clogging of the sieving plate.

[0008]

In order to solve the above problems, the present invention takes the following technical means. That is, the present invention, the blast chamber, the abrasive cleaning agent storage chamber provided in the upper portion of the blast chamber, is disposed inside the blast chamber,
Equipped with a blast nozzle that mixes the air sent from the air supply means with the abrasive cleaning material sent from the abrasive cleaning material storage chamber and injects it, and recovers the abrasive cleaning material that has fallen below the blast chamber. In a blasting device configured to collect in the abrasive cleaning material storage chamber by suction negative pressure via a pipe, a predetermined vibration is given by an oscillating means, and an upper part can relatively vibrate relative to a lower part of the blasting chamber. A sieving container connected to
It is horizontally stretched in this sieving container, and is provided with a sieving plate for sieving the burr mixed with the cleaning and cleaning material, and is provided on the side wall of the sieving container just above the peripheral edge of the sieving plate, and is screened by the sieving plate. Equipped with a burr discharge port for discharging burr,
While discharging the burr that has fallen on the sieving plate to the outside of the sieving container, a vibrating sieving device that sucks the polishing and cleaning material that has fallen below the sieving plate into the polishing and cleaning material recovery pipe is provided at the bottom of the blast chamber. On the other hand, while being provided, an upper end portion is made to communicate with the blast chamber and a lower end portion is made to communicate with the polishing and cleaning material recovery pipe, and at least an air bypass pipe line that does not suck the burr is provided.

[0009]

The burr scraped off from the work during the operation of the blast device is mixed with the abrasive cleaning material sprayed from the blast nozzle and drops on the sieve plate in the sieve container.
Since the sieving plate is in a vibrating state, the cleaning material immediately passes through the sieving plate and falls, and as a result, the burr is
Effectively sifted on a sieving plate.

By the way, the three-dimensional vibration given to the sieve plate by the vibrating type sieving apparatus causes the object on the sieve plate to behave like parts in a so-called circular part feeder. That is, the burrs and the like screened on the sieving plate are spirally moved to the peripheral portion by the three-dimensional vibration of the sieving plate as described above, and the burrs and the like moved to the peripheral portion are sieve containers. Can be moved along the inner surface of the. The burr that moves while vibrating along the peripheral portion of the sieve plate is automatically and continuously discharged to the outside from the burr discharge port provided on the side wall of the sieve container by the movement caused by the vibration.

On the other hand, the polishing material which has passed through the sieving plate falls to the bottom of the sieving container. Then, the polishing / cleaning material is collected in the polishing / cleaning material storage chamber arranged in the upper part of the blast chamber by suction negative pressure through the polishing / cleaning material recovery pipe connected to the lower portion of the sieving container. However, in the blasting device having the above configuration, the negative suction pressure of the abrasive cleaning material recovery pipe acts on the surface of the sieving plate, thereby generating a relatively large air flow from the upper portion to the lower portion inside the sieving container. .. Therefore, if no measures are taken, even if the sieve plate is vibrating, the burrs screened by the sieve plate by the sieve plate will be spread on the sieve plate by the air flow from above to below. There is a case in which the spiral movement, which is expected by vibrating the sieve plate, is not generated due to the pressing.

However, in the blast device according to the present invention, the upper end portion is made to communicate with the blast device and the lower end portion is made to communicate with the abrasive cleaning material recovery pipe, and at least the bypass pipe line which does not suck the burr is provided. It is provided. By providing the bypass conduit, the air in the blast chamber is mainly sucked into the abrasive cleaning material recovery pipe through the bypass conduit. Therefore, the air flow passing from the upper side to the lower side of the sieving plate is not so large as to hinder the movement of the burr on the sieving plate. As a result, there is no problem that the sifted burr adheres to the sieving plate and causes clogging of the sieving plate.
On the other hand, since a large amount of air can flow in the polishing / cleaning material recovery pipe, the polishing / cleaning material can be smoothly transported.
Moreover, the bypass pipe is configured so that at least the burr is not sucked by providing a filter or the like at the suction port portion communicating with the blast chamber. Therefore, there is no fear that the burr will be sucked into the above-mentioned polishing / cleaning material recovery pipe together with the polishing / cleaning material.

As described above, according to the blasting apparatus of the present invention, it is possible to efficiently remove unnecessary substances such as burrs mixed in the polishing and cleaning material while continuing the continuous operation of the apparatus. The processing efficiency of blasting, blasting efficiency, etc. can be dramatically improved compared to the conventional method, and the labor of removing burrs accumulated on the sieving plate at regular intervals is completely unnecessary, reducing the work cost. Has been
It is clear that this greatly contributes to the reduction of product cost.

[0014]

Description of Embodiments Embodiments of the present invention will be specifically described below with reference to FIGS. 1 to 8. 1 to 5,
The 1st Example of the blasting apparatus which concerns on this invention is shown. FIG. 1 shows the overall configuration of a blasting device 1 according to this embodiment. The inside of the main body container 3 which is supported and installed by a plurality of legs 2 is divided into an upper abrasive cleaning material storage chamber 4 and a lower blast chamber 5. The bottom of the abrasive cleaning material storage chamber 4 and the bottom of the blast chamber 5 are both hopper-shaped, and the abrasive cleaning material existing in both chambers 4 and 5 is centered at the bottom of each chamber 4 and 5 due to gravity. It is configured to be collected in.

A blast nozzle 6 is disposed inside the blast chamber 5, and the blast nozzle 6 has a base end portion which is connected to a lower portion of the blast material storage chamber 4 and has one end connected thereto. The hose 7 and an air supply hose 8 connected to an external air supply source (not shown) are connected. As the external air supply source, a compressor that generates compressed air or a low-pressure blower such as a roots blower that generates a low-pressure large-flow airflow is used.

The interior of the blast nozzle 6 is constructed so that the high-speed air stream flowing from the air supply hose 8 to the nozzle hole is mixed with the polishing / cleaning material supplied via the polishing / cleaning material supply hose 7. Therefore, in the operating state in which the air supply hose 8 is supplying the air flow to the blast nozzle 6, the high-speed air flow mixed with the polishing and cleaning material is jetted from the tip of the blast nozzle 6. The work to be blasted is, for example, blasted by the blast nozzle while being held in the blast chamber by the hand of an operator who is inserted through a work opening (not shown) opened in the blast chamber 5 or the blast chamber is laterally moved. A conveyor mechanism (not shown) is arranged so as to penetrate through, and the blast processing by the blast nozzle 6 is performed on the work continuously carried into the blast chamber by such a conveyor mechanism.

A vibrating sieving device 9 is connected to the hopper-shaped lower end of the blast chamber 5 to continuously remove unnecessary burrs from the polishing material mixed with burrs scraped from the work by blasting. It is like this. The vibrating sieving device 9 and its peripheral structure are essential parts of the present invention, and will be described later in detail. The abrasive cleaning material from which unnecessary burrs have been removed by the vibrating sieving apparatus 9 is recovered in the abrasive cleaning material storage chamber 4 via an abrasive cleaning material recovery pipe 10 connected to a lower portion of the vibrating sieving apparatus 9. .. The recovery of such a cleaning material is carried out by air conveyance using the negative pressure generated by the dust collector 11 arranged on the side of the main body container 3.

That is, the dust collecting pipe 12 connected to the dust collecting device 11 is connected to the upper end of the polishing / cleaning material storage chamber 4, while the side wall of the polishing / cleaning material storage chamber 4 and the vibrating screen device are connected. The abrasive cleaning material recovery pipe 10 is connected to the pipe 9. Therefore, the negative pressure generated by the dust collecting device 11 acts on the lower end connection portion of the vibrating screen device 9 via the dust collecting pipe 12, the polishing / cleaning material storage chamber 4, and the polishing / cleaning material recovery pipe 10. As a result, the polishing / cleaning material dropped below the vibrating type sieving device 9 is conveyed to the above-mentioned polishing / cleaning material storage chamber 4 via the polishing / cleaning material recovery pipe 10 with a suction force by negative pressure.

By the way, the polishing / cleaning material storage chamber 4 in the present embodiment is constructed so as to efficiently separate the dust from the polishing / cleaning material containing the dust and send it to the dust collector 11. There is. That is, the baffle 13 hanging from the ceiling
Is provided in the vicinity of the connection portion of the abrasive cleaning material recovery pipe 10,
Thereby, when the air flow introduced from the polishing / cleaning material recovery pipe 10 into the polishing / cleaning material storage chamber 4 passes below the baffle plate 13, the flow cross section is greatly expanded. There is. Thus, the rapid expansion of the flow cross section of the air flow passing below the baffle plate 13 means that the velocity of the air flow is greatly reduced when passing below the baffle plate 13, whereby the polishing is performed. Even if the flow rate of the air sent to the dust collector 11 through the material recovery pipe 10 is relatively large, the abrasive material is not sent to the dust collector 11 via the dust pipe 12 while floating in the air. .. As a result, the abrasive cleaning material surely falls due to gravity and drops to the bottom of the hopper-shaped abrasive cleaning material storage chamber 4, while only fine dust mixed with the burr by the blasting device into the abrasive cleaning material is removed. It is carried by the air flow flowing through the material storage chamber 4 and sent to the dust collector 11.

The dust collecting device 11 has a structure in which a dust collecting element 15 is supported inside the container 14 by a partition wall that divides the upper part and the lower part, and a suction blower 16 is arranged on the upper part of the container 14. The dust-mixed air introduced from the dust collecting tube 12 into the lower chamber of the container is sucked by the suction blower 16 by the suction force.
Dust is removed as it passes through the dust collection element 15. Note that, in FIG. 1, the reference numeral 17 indicates that relatively heavy dust or the like that is not removed by the dust collecting element 15 and accumulates in the lower portion of the container is stored outside the container of the dust collecting device 11 while maintaining a negative pressure. A so-called rotary valve for discharging to is shown.

The vibrating type sieving apparatus 9 according to this embodiment includes a cylindrical sieving container 20 having a vertical axis supported by a plurality of elastic springs 19 with respect to a base plate 18. In this embodiment, a space between the upper end of the sieving container 20 and the lower end of the lower hopper of the blast chamber 5 is covered with the abrasive cleaning material scattering prevention member 21. The scattering prevention member 21 is made of a flexible sheet material because the main body container 3 forming the blast chamber 5 is fixedly instructed and the vibrating screen device 9 is in a vibrating state. ing. In addition, the above-mentioned abrasive cleaning material scattering prevention member 21,
It may be formed by using a flexible mesh or the like having a fine mesh that is impermeable to the abrasive, and may be configured so that the burr sieving action inside the sieving container 20 can be visually confirmed and inspected from above. it can.

In the portion above the sieving container 20 from above,
A sieving plate 22 having a mesh of a size that allows only the polishing material to pass therethrough and that does not allow dust such as burrs larger than that to pass through is stretched in the horizontal direction. Also,
As shown in FIGS. 1, 2 and 4, the blast chamber 5
A guide curtain 23 is hung from the lower end of the hopper so as to surround the abrasive cleaning material drop opening 31 to the vicinity of the upper surface of the central portion of the sieving plate 22. This is to prevent the polishing / cleaning material containing burrs falling from the polishing / cleaning material drop port 31 from being scattered along the entire upper surface of the sieving plate 22 and being discharged together with the burrs. Further, on the side wall of the sieving container 20, immediately above the sieving plate 22, there is provided a burr discharge port 24 for discharging burrs to be sieved on the sieving plate 22.

On the other hand, the polishing / cleaning material recovery pipe 10 is connected to the bottom wall of the sieving container 20, and the polishing / cleaning material which has passed through the sieving plate 22 and dropped downward is guided by a sloped guide 25. After being collected on one side of the lower part of the sieving container 20, it is sucked into the polishing / cleaning material recovery pipe 10 through the polishing / cleaning material suction port 26 formed so as to rise on the inner surface of the sloped guide 25, and It is configured to be transported to the material storage chamber 4. Further, there are various forms of the vibrating body for applying a predetermined three-dimensional vibration to the sieving container 20 or the sieving plate 22 arranged inside the sieving container 20.
In this embodiment, the oscillating body 27 driven by a motor is directly attached to the outer wall portion of the sieving container 20.

Further, in this embodiment, the central portion of the sieving container 20 extends vertically in a communicating manner, the upper end of which is projected into the blast chamber 5, and the lower end of which is the abrasive cleaning material recovery pipe 10. A bypass line 28 is provided that communicates with the. As shown in FIG. 2, the bypass conduit 28 has an upper bypass conduit 29 having an upper end, which is made to have its tip portion projected into the blast chamber 5 and which guides air in the blast chamber to the upper surface of the sieving plate 22. And a lower bypass pipe line 30 that is connected to the upper bypass pipe line 29 via the sieving plate 22 and has a lower end portion connected to the abrasive cleaning material recovery pipe 10 connected to the lower part of the sieving container 20. It is equipped with.

As shown in FIG. 3, the upper bypass conduit 29 is mounted on the side wall of the abrasive cleaning material drop port 31 provided at the lower end of the blast chamber 5 via a mounting bracket 32. A suction pipe 33 fixed to the container body 3, and a suction pipe provided at an upper end portion of the suction pipe 33 and covered with a mesh wire mesh or the like so as not to suck at least burrs generated in the blast chamber. It is provided with a mouth 34 and a guide pipe 35 that hangs below the suction pipe 33 and guides the air in the blast chamber sucked from the suction port 34 to the upper surface of the sieving plate 22. On the other hand, the lower bypass conduit 30 is provided with a rising pipe 37 extending upward from a sloped guide 25 provided in the sieve container 20 of the vibrating screen device 9 and an upper end portion of the rising pipe 37. The lower end portion is fixed in a sleeve-like shape and is extended upward, and the upper end portion is provided with a guide pipe 38 abutting against the lower surface of the sieving plate 22. As shown in FIGS. 2 and 5, the lower end portion of the rising pipe 37 penetrates the sloped guide 25 and the polishing / cleaning material recovery pipe 1
0, and the sloped guide 2
The polishing / cleaning material suction port 26 formed on one side of the upper surface of 5 is also communicated with the above-mentioned polishing / cleaning material recovery pipe 10, so that the polishing / cleaning material dropped on the upper surface of the inclined guide 25 can be sucked. Is configured.

In the above structure, the lower bypass conduit 30 vibrates together with the vibrating sieving device 9, while the upper bypass conduit 29 is fixedly supported by the main body container 3. Therefore, the guide pipes 35 and 38 arranged above and below the sieving plate 9 are made of flexible rubber or the like, and are elastic to the sieving plate 22 even when the vibrating sieving device 9 is in operation. The upper bypass conduit 29 and the upper bypass conduit 30 are brought into contact with each other and can communicate with each other.

The operation of the blasting device having the above structure will be described below. The dust collecting device 11 and the vibrating sieving device 9 are put into an operating state by activating the suction blower 16 and the vibrating body 27, and the air supply hose 8 is connected to the blast nozzle 6 by the operation of the external air supply source. The continuous flow of high velocity air flow through the blasting machine keeps the entire blasting machine in operation. Then, the polishing / cleaning material sent through the polishing / cleaning material supply hose 7 is mixed with the high-speed air stream and is sprayed from the tip of the blast nozzle 6, and is introduced or carried into the blast chamber by the spray of this polishing / cleaning material. Blast processing is performed on the work.

The vibrating sieving device 9 in the operating state is three-dimensionally vibrated by the vibrating body 27. This three-dimensional vibration causes burrs and the like to be sieved on the sieving plate 22 as shown in FIG.
It is set so that it can be spirally moved from the central portion toward the peripheral portion as shown in FIG. When the apparatus is in the operating state, in the conventional blasting apparatus, the abrasive cleaning material recovery pipe 10
A negative pressure generated by the suction blower 16 of the dust collector 11 acts on the bottom of the sieving container 20 via the. In the present embodiment, the central portion of the sieving container 20 extends vertically through the sieving plate 22 so that the upper end of the sieving container 20 is projected into the blast chamber 5 and the lower end of the sieving / cleaning material recovery is obtained. Since the bypass line 28 communicated with the pipe 10 is provided, the negative pressure in the abrasive cleaning material recovery pipe causes
The air in the blast chamber is mainly used in this bypass line 28.
And is sucked into the polishing / cleaning material recovery pipe 10. Therefore, in the inner space of the sieving container outside the bypass conduit 28, a strong air flow passing through the sieving plate 22 from top to bottom does not occur. Therefore, the burr-containing abrasive cleaning material dropped from the blast chamber 5 through the inside of the guide curtain 23 onto the sieving plate 22 is promptly combined with the fact that the sieving plate 22 is three-dimensionally vibrated. Then, only burrs are sieved so that only the burr remains on the sieving plate 22. The burr thus screened on the sieving plate 22 does not come into close contact with the sieving plate 22 by the air flow flowing from the top to the bottom. And is continuously discharged from the burr discharge port 24 to the outside.

In addition, in the present embodiment, as described above, the guide curtain 23 is hung from the peripheral portion of the abrasive cleaning material dropping port 31 of the blast chamber 5 and the abrasive cleaning material is dropped only on the central portion of the sieve plate 22. Is configured as follows. Therefore, the abrasive material does not scatter all over the sieving plate 22 and is discharged to the outside from the burr discharge port 24 together with the screened burrs. In addition, in the present embodiment, FIG.
And, as shown in FIG. 4, the guide curtain 23,
A guide wall 39 is provided between the burr discharge port 24 and the burr discharge port 24 to prevent the burr on the sieve plate from directly moving outward in the radial direction. This more reliably prevents the polishing and cleaning material from being accidentally discharged from the burr discharge port 24. The polishing / cleaning material that has passed through the sieve plate 22 is mainly collected on one side of the bottom wall along the sloped guide 25, and then from the polishing / cleaning material suction port 26 formed on one side of the bottom wall. Abrasive material recovery pipe 1
It is sucked into 0 and conveyed to the abrasive cleaning material storage chamber 4.

In this embodiment, the abrasive cleaning material suction port 2 is used.
As shown in FIGS. 2 and 5, 6 is configured to be able to suck the polishing material in the direction along the surface of the sloped guide 25, and is dropped onto the sloped guide 25. It is possible to smoothly inhale the cleaning agent. As described above, as a result of the blast treatment, dust such as burrs larger than the particle diameter of the abrasive cleaning material that is scraped off from the work and mixed in the abrasive cleaning material has the above-described vibrating screen device 9 that the blasting device of the present invention particularly has. Surely and quickly screened and discharged to the outside. Since such dust and the like is continuously discharged at all times, a fixed installation type sieving plate is provided so that the entire device is removed at regular intervals like a conventional blasting device for sieving burrs and the like. The necessity of stopping and cleaning the sieve plate is completely unnecessary, and the continuity of the blast treatment is dramatically improved.

FIG. 6 shows a second embodiment of the present invention. In the blasting apparatus according to the present embodiment, the lower end of the upper bypass conduit 29 and the upper end of the lower bypass conduit 30 that extend vertically through the central portion of the sieving container 20 are interposed between them. The plate 22 and the plate 22 are fastened together by bolts 41. Therefore, the upper bypass conduit 29 is not fixed to the container body 3 as in the first embodiment, but is vibrated together with the vibrating screen device 9. Therefore, unlike the first embodiment, it is not necessary to provide the flexible guide pipe 35 in the upper bypass conduit 29. Further, the suction port 3 provided at the upper end of the upper bypass conduit 29
Since 4 is vibrated together with the sieving plate 22, there is no fear that the cleaning material or the like will be clogged with the wire net or the like of the suction port 34, and the air in the blast chamber can be smoothly sucked.

7 and 8 show a third embodiment according to the present invention. In this embodiment, the polishing / cleaning material which has passed through the sieve plate 22 and dropped downward is collected in the central portion of the sieve container 20 by a funnel-shaped guide 25a and sucked into the polishing / cleaning material recovery pipe 10. It was done. Also in the present embodiment, the central portion of the sieving container 20 extends in communication with the sieving plate 22, the upper end of the sieving container 20 is projected into the blast chamber 5, and the lower end of the sieving / cleaning material recovery pipe 10 is provided. A bypass line 28 is provided that is in communication with each other. In the present embodiment, a plurality of brackets 40 extending outward in the radial direction are provided on the outer peripheral portion of the rising pipe 37 of the bypass conduit 28, and the tip end of the bracket 40 is the inner surface of the funnel-shaped guide 25a. The lower end of the rising pipe 37 is supported at the center of the sieving container 20 by being fixed to an appropriate portion by welding or the like. Further, the lower end portion of the rising pipe 37 of the present embodiment is projected into the inside of the outlet opening 26a of the funnel-shaped guide 25a, and the outer peripheral portion of the rising pipe 37 and the inner peripheral portion of the outlet opening 26a. The polishing / cleaning material is configured to be sucked into the polishing / cleaning material recovery pipe 10 through a gap 28a formed between the cleaning and cleaning material.

Further, in this embodiment, as shown in FIG. 7, the horizontal portion of the abrasive cleaning material recovery pipe 10 extending from the lower end portion of the sieving container 20 is branched into two in the middle and branched upward. The pipe 10a is connected to the abrasive cleaning material storage chamber 4 as in the conventional case, while the branch pipe 10b extending in the horizontal direction is connected to the dust collector 14. Further, a branch portion of the branch pipe 10b toward the dust collector 14 has a mesh that does not allow the polishing / cleaning material conveyed in the polishing / cleaning recovery tube 10 to pass through but allows dust to pass through that is smaller than the polishing / cleaning material. A separation filter 42 is provided. By providing the separation filter 42, it becomes possible to efficiently remove fine dust in the abrasive cleaning material collected from the sieving container 20, and cooperate with the baffle plate 13 of the abrasive cleaning material storage chamber 4 in cooperation with the baffle plate 13. Therefore, it is possible to efficiently prevent the performance of the abrasive material from being deteriorated due to the mixing of fine dust. Moreover, by providing the separation filter 42 obliquely with respect to the horizontal direction as shown in FIG. 7, after the polishing / cleaning material flowing through the polishing / cleaning material recovery pipe 10 collides with the separation filter 42 once, It is configured to be conveyed upward. The collision of the polishing and cleaning material with the separation filter 42 causes the separation filter 42 to vibrate slightly, and the fine dust mixed in the polishing and cleaning material can be further efficiently separated. The scope of the present invention is not limited to the above embodiments. For example, in the above-described embodiment, as the vibrating body for generating the three-dimensional vibration in the sieving container 20, a type in which the oscillating body 27 is directly attached to the partition wall of the sieving container 20 is adopted. Granules sieved by 22
It may be any one as long as it can give a three-dimensional vibration that is sent to the peripheral portion while making a spiral motion, and another vibrating body may be adopted as a mechanism for generating such a three-dimensional vibration.

Further, in the embodiment, the bypass pipe 28 is formed so as to extend vertically through the central portion of the sieving container 20, but it is formed so as to extend outside the sieving container 20 and the blasting is performed. The polishing agent recovery pipe 10 can be communicated with the chamber 5. Further, in the embodiment, the upper bypass pipeline 29 and the lower bypass pipeline 30 are provided above and below the sieve plate 22 as the bypass pipeline 28, but the upper bypass pipeline and the lower bypass pipeline are integrally formed. However, a sieving plate may be stretched between the outer peripheral portion of this bypass conduit and the inner peripheral portion of the sieving container 20.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an overall configuration of a preferred embodiment of the present invention.

FIG. 2 is an enlarged view of a main part in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV in FIG.

FIG. 6 is a side sectional view showing another embodiment according to the present invention.

FIG. 7 is a side sectional view showing a third embodiment according to the present invention.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blasting device 4 Abrasive cleaning material storage chamber 5 Blasting chamber 6 Blast nozzle 9 Vibratory sieving device 10 Abrasive cleaning material recovery pipe 20 Sieve container 22 Sieve plate 24 Burr discharge port 27 Vibratory body 28 Bypass pipe line

Claims (1)

Claim: What is claimed is: 1. A blast chamber, a polishing and cleaning agent storage chamber provided at an upper portion of the blast chamber, and the polishing and cleaning agent for the air that is disposed inside the blast chamber and is sent from an air supply means. Equipped with a blast nozzle that mixes and injects the abrasive cleaning agent sent from the storage chamber, and stores the abrasive cleaning agent dropped to the lower part of the blast chamber by suction negative pressure through the abrasive cleaning agent recovery pipe. In a blasting device configured to be collected in a chamber, a vibrating means applies a predetermined vibration, and an upper part is connected to the lower part of the blast chamber so as to be capable of relative vibration, and A baffle that is stretched horizontally and sifts burrs mixed in the cleaning and cleaning material, and a burr that is provided immediately above the periphery of the sieving plate on the side wall of the sieving container and discharges the burrs screened by the sieving plate. With outlet A vibratory sieving device is installed at the bottom of the blast chamber to discharge the burr that has fallen on the sieving plate to the outside of the sieving container, and to suck the blasting and cleaning material that has dropped below the sieving plate into the blasting and cleaning material recovery pipe. On the other hand, a blasting device characterized in that an upper end portion is made to communicate with the blast chamber and a lower end portion is made to communicate with the abrasive cleaning material recovery pipe, and at least an air bypass pipe line that does not suck the burr is provided.