JP6720731B2 - Shot blasting equipment - Google Patents

Description

The present invention relates to a shot blasting device.

The tire manufacturing method includes a preforming step of obtaining an unvulcanized raw cover and a vulcanizing step of placing the raw cover in a mold and vulcanizing it. In this vulcanization step, the raw cover is vulcanized to obtain a tire. The surface of this tire is molded following the cavity surface of the mold. This mold is used repeatedly.

The mold is regularly repaired to ensure that it does not degrade the appearance of the tire. In this repair, flaws and the like on the cavity surface are polished. Such repair changes the surface condition of the cavity surface such as surface roughness. This change in the surface condition causes a so-called shininess or the like having a gloss different from that of other portions on the tire surface.

Shot blasting is sometimes used to repair this mold. Shot blasting is a method of processing the surface of a workpiece by colliding a granular material called a shot material with the workpiece. Japanese Unexamined Patent Publication No. 2015-136886 describes a device for shot blasting the cavity surface of a tire mold. In this device, the projection material is blown onto the cavity surface with compressed air to process the cavity surface. In the present invention, the device for spraying the projection material with compressed air in this way is called a shot blasting device.

JP, 2005-136886, A

An object of the present invention is to provide a shot blasting device that can be carried and that can collect the shot material.

The shot blasting apparatus according to the present invention includes a tank having a stock room for storing shot material, a mixing room communicating with the stock room, a first air pipe for supplying air to the mixing room, and the mixing room. It is provided with a nozzle that communicates, a cover that covers the periphery of the nozzle, a recovery pipe that communicates with the cover, and a second air pipe that supplies air to the flow path of the recovery pipe. The nozzle includes an injection port that injects the shot material and the air supplied by the first air pipe. The cover has an opening. The opening of the cover is opened in a direction in which the shot material is jetted from the jet port of the nozzle. The cover is located upstream of the flow path of the recovery pipe. The second air pipe has an opening. The opening of the second air pipe is located in the flow path of the recovery pipe. The opening of the second air pipe opens toward the downstream of the flow path of the recovery pipe.

Preferably, the cross-sectional area of the flow path of the second air pipe is gradually reduced toward the opening of the second air pipe.

Preferably, at the position of the opening of the second air pipe, the intersection angle between the center line of the flow passage of the recovery pipe extending from the cover and the center line of the flow passage of the second air pipe is an acute angle. There is.

Preferably, the tank is equipped with a partition plate. The partition plate partitions the storage chamber into a first chamber that communicates with the mixing chamber and a second chamber that communicates with the recovery pipe. The partition plate is located on the front side in a direction in which air flows from the recovery pipe into the second chamber.

Preferably, the partition plate includes a communication port that connects the first chamber and the second chamber.

Preferably, the shot blasting device comprises a filter. The filter includes an inflow port that communicates with the recovery pipe, an outflow port that communicates with the tank, and a filter body that allows air to pass therethrough. The filter body forms a flow path from the inflow port to the outflow port. The cross-sectional area of the flow path formed by the filter body is larger than the cross-sectional area of the flow path of the recovery pipe.

Preferably, the cover includes a cover body and an elastic cover. The elastic cover is attached to the front of the cover body.

Preferably, the elastic cover is made of sponge.

Preferably, the cover includes a rear wall that covers the rear of the periphery of the nozzle, and an outer peripheral wall that continuously covers the outer periphery of the periphery of the nozzle. At least a part of the rear wall and the outer peripheral wall is made of a transparent material through which the opening of the cover can be seen.

Preferably, the shot blasting device comprises a body. The tank is integrally attached and fixed to the main body. The main body and the tank are integrally portable.

In the shot blasting device according to the present invention, since the periphery of the nozzle is covered with the cover, scattering of the shot material is suppressed. The projection material in the cover is collected in the collection pipe by the air in the second air pipe. This shot blasting device is excellent in the recovery efficiency of the shot material. By reusing this collected shot material, the amount of shot material stored in the tank can be reduced as compared with the conventional case. This shot blasting device can be reduced in size and weight. This shot blasting device can be made portable.

FIG. 1 is a structural explanatory view of a shot blasting apparatus according to an embodiment of the present invention. FIG. 2 is an explanatory view of the structure around the nozzle of the shot blasting apparatus of FIG. FIG. 3 is an external view of the shot blasting apparatus of FIG.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

The shot blasting device 2 of FIG. 1 includes a tank 4, a supply pipe 6, an air pipe 8 as a first air pipe, a mixing chamber 10, a nozzle 12, a cover 14, a recovery pipe 18, a filter 20, and an air as a second air pipe. A pipe 22, an air pipe 24 as a connection pipe, and a connection port 26 are provided. The leftward in the left-right direction in FIG. 1 will be described as the forward facing in the front-back direction of the shot blasting device 2.

The tank 4 includes a stock room 28. Projection materials are stored in the storage room 28. Examples of the shot material include fine particles such as glass and resin. The tank 4 includes a partition plate 30. The partition plate 30 divides the storage room 28 into a first room 32 and a second room 34. The first chamber 32 and the second chamber 34 communicate with each other through a communication port 36. The projection material can be supplied from the second chamber 34 to the first chamber 32 through the communication port 36.

One end of the supply pipe 6 is connected to the first chamber 32 of the tank 4. The other end of the supply pipe 6 is connected to the mixing chamber 10. The tank 4 and the mixing chamber 10 communicate with each other through the supply pipe 6. The projection material can be supplied from the tank 4 to the mixing chamber 10 through the supply pipe 6. The tank 4 is located upstream of the supply pipe 6, and the mixing chamber 10 is located downstream of the supply pipe 6. In the present invention, the direction in which the blast material and the air flow is referred to as the upstream, and the direction in which the blast material and the air flow is referred to as the downstream in the flow path through which the blast material and the air flow. A regulating valve 38 is attached to the supply pipe 6. The adjusting valve 38 can adjust the supply amount of the shot material flowing through the supply pipe 6.

One end of the air pipe 8 is connected to the mixing chamber 10. The other end of the air pipe 8 is connected to the air pipe 24. The air pipe 8 forms a flow path of compressed air. The mixing chamber 10 is located downstream of the air pipe 8 and the air pipe 24 is located upstream of the air pipe 8. A switching valve 40 and a regulating valve 42 are attached to the air pipe 8. The switching valve 40 can be switched between a closed state in which the air flow path is blocked and an open state in which the air flow path is opened. The switching valve 40 is normally closed by the bias of the elastic body. It is possible to switch to the open state by an external force against the biasing force of the elastic body. The adjustment valve 42 can adjust the flow rate of air flowing through the air pipe 8.

The supply pipe 6 and the air pipe 8 are connected to the rear of the mixing chamber 10. A nozzle 12 is connected to the front of the mixing chamber 10. The nozzle 12 is located downstream of the mixing chamber 10. Air can be fed into the mixing chamber 10 through the air pipe 8. When the air flows into the mixing chamber 10, the projection material in the tank 4 is sucked through the supply pipe 6. In this mixing chamber 10, air and blast material can be mixed. The mixed air and projection material can be sent to the nozzle 12. Although not shown, the cross-sectional area of the flow path of the air pipe 8 may be gradually reduced toward the opening located in the mixing chamber 10. In the present invention, the cross-sectional area of the flow channel is measured in a cross section perpendicular to the flow direction of the flow channel.

The nozzle 12 has a projection port 44. The projection port 44 is open forward. The cross-sectional area of the flow path of the nozzle 12 gradually decreases toward the projection port 44. Air and shot material may flow into the nozzle 12 from the mixing chamber 10. The air and the projection material can be projected forward from the projection port 44.

As shown in FIG. 2, the cover 14 includes a cover body 46 and a sponge 48 as an elastic cover. Examples of the material of the sponge 48 include resin, rubber, natural materials and the like. The cover body 46 includes a rear wall 46a and an outer peripheral wall 46b. The rear wall 46a extends from the outer peripheral surface of the nozzle 12 to the outer peripheral wall 46b. The rear wall 46a is connected to the outer peripheral surface of the nozzle 12 without any gap. In this way, the outer wall 46a covers the rear of the periphery of the nozzle 12. The rear wall 46a is made of transparent resin, for example. The outer peripheral wall 46b covers the outer peripheral surface of the nozzle 12 with a space provided between the outer peripheral wall 46b and the outer peripheral surface of the nozzle 12. In other words, the outer peripheral wall 46b covers the outer periphery around the nozzle 12.

The sponge 48 is attached to the front of the cover body 46. A through hole 50 is formed in the sponge 48. A front opening 48a and a rear opening 48b are formed in the sponge 48 by the through hole 50. The front opening 48a is located in front of the projection port 44 of the nozzle 12. The front opening 48a opens forward. The front opening 48 opens in the same direction as the projection port 44 of the nozzle 12. The opening area of the front opening 48 a is larger than the opening area of the projection port 44 of the nozzle 12. The rear opening 48b is located behind the projection port 44 of the nozzle 12. The rear opening 48b may be located in front of the projection port 44 of the nozzle 12. The rear opening 48b opens rearward. The cross-sectional area of the through hole 50 gradually decreases from the rear opening 48b toward the front opening 48a.

The dashed-dotted line L1 in FIG. 2 represents the line of sight of the operator who operates the shot blasting device 2. The projection 14 of the nozzle 12 and the front opening 48a of the cover 14 can be visually confirmed from the rear of the cover 14 through the rear wall 46a. Although the transparent resin material has been described as an example here, the rear wall 46a may be made of a transparent material that allows the front opening 48a to be visible from the rear side thereof. Although the rear wall 46a is described here as an example, the outer peripheral wall 46b may be made of a visible transparent material. It suffices that the projection port 44 and the front opening 48a can be visually confirmed from the rear of the cover 14, and any one of the rear wall 46a and the outer peripheral wall 46b may be made of a visible transparent material. ..

As shown in FIG. 1, one end of the recovery pipe 18 is connected to the cover body 46. The other end of the recovery pipe 18 is connected to the tank 4 with the filter 20 in between. The recovery pipe 18 communicates with the tank 4 via a filter 20. The cover 14 is located upstream of the recovery pipe 18, and the filter 20 and the tank 4 are located downstream of the recovery pipe 18. It is preferable that the recovery pipe 18 is made of a lightweight material having excellent durability. The recovery pipe 18 is made of, for example, an aluminum alloy.

The filter 20 includes an inflow port 20a, an outflow port 20b, and a filter body 20c. The inflow port 20a opens at one end of the filter body 20c. The inflow port 20a is connected to the other end of the recovery pipe 18. The outlet 20b opens at the other end of the filter body 20c. The outlet 20b is connected to the tank 4. In the tank 4, the outflow port 20b is connected to the second chamber 34.

The filter body 20c forms a flow path between the recovery pipe 18 and the tank 4. The filter body 20c forms the outer wall of this flow path. The filter body 20c is made of a gas permeable material capable of discharging air to the outside from the flow path formed by the filter body 20c. The entire filter body 20c is made of a breathable material. As the filter body 20c, for example, a mesh filter made of cloth or paper is used. The filter body 20c has a mesh that allows air to flow from the flow path and does not allow the projection material to pass therethrough. The filter body 20c can be expanded and contracted. In the expanded state of the filter body 20c, the cross-sectional area of the flow passage is larger than the cross-sectional area of the flow passage of the recovery pipe 18. A commercially available filter used in a vacuum cleaner may be used as the filter body 20c.

One end of the air pipe 22 is connected to the recovery pipe 18 between the cover body 46, the tank 4 and the filter 20. The other end of the air pipe 22 is connected to the air pipe 24. The air pipe 22 forms a flow path of compressed air. The air pipe 24 is located upstream of the air pipe 22, and the recovery pipe 18 is located downstream of the air pipe 22. A regulating valve 52 is attached to the air pipe 22. The adjusting valve 52 can adjust the flow rate of the air flowing through the air pipe 22.

The air pipe 22 includes a pipe body 54 and an air nozzle 56. The air nozzle 56 is attached to one end of the pipe body 54. The air nozzle 56 constitutes one end of the air pipe 22. The air nozzle 56 has an opening 58. The cross-sectional area of the flow path of the air nozzle 56 gradually decreases toward the opening 58. The cross-sectional area of the opening 58 is smaller than the cross-sectional area of the flow path of the pipe body 54. The opening 58 is located in the flow path of the recovery pipe 18.

The dashed-dotted line L2 in FIG. 1 represents the center line of the flow path of the recovery pipe 18 from the cover 14 toward the confluence of the air pipes 22. The alternate long and short dash line L3 represents the center line of the flow path of the air pipe 22. The one-dot chain line L3 is also the center line of the air nozzle 56. Further, it is also the center line of the flow path of the recovery pipe 18 toward the tank 4 at the position of the opening 58. The angle θ represents an intersection angle between the flow path of the recovery pipe 18 and the flow path of the air pipe 22. In this shot blasting device 2, the direction of the opening 58 of the air nozzle 56 is the same as the direction of the flow path of the recovery pipe 18 toward the tank 4 and the filter 20 at the position of the opening 58.

The air pipe 8 and the air pipe 22 are connected to one end of the air pipe 24. At one end of the air pipe 24, the air pipe 8 and the air pipe 22 are branched. A connection port 26 is attached to the other end of the air pipe 24. The connection port 26 can be connected to a compressed air supply pipe.

FIG. 3 shows the appearance of the shot blasting device 2. An arrow X in FIG. 3 indicates forward and backward of the shot blasting device 2, an arrow Y indicates leftward and rightward, and an arrow Z indicates upward and downward.

As shown in FIG. 3, the shot blasting device 2 includes a body 60, a grip 62, a lever 64, and an auxiliary grip 66. The main body 60 extends rearward from the cover 14. The grip 62 projects downward from the rear of the main body 60. The auxiliary grip 66 projects leftward from the front of the main body. A lever 64 is attached to the grip 62.

Although not shown, the mixing chamber 10, a part of the air pipe 8 and the switching valve 40 are housed inside the main body 60 and the grip 62. The lever 64 is attached to the grip 62 so as to be movable in the front-rear direction. By pulling the lever 64 backward, the switching valve 40 can be switched to the open state against the biasing force of the elastic body. By removing the external force that pulls the lever 64 rearward, the switching valve 40 can be switched from the open state to the closed state by the urging force of the elastic body.

In this shot blasting device 2, the tank 4 is attached and fixed to the main body 60. A supply pipe 6 extends from the tank 4 to the mixing chamber 10 housed in the main body 60. The cover 14 is attached to the front of the main body 60. The nozzle 12 is arranged inside the cover 14. The recovery pipe 18 extends from the cover 14 to the filter 20. The filter 20 is connected to the tank 4. In this shot blasting device 2, the tank 4, the supply pipe 6, the mixing chamber 10, the nozzle 12, the cover 14, the recovery pipe 18, the filter 20, and the switching valve 40 are integrated with the main body 60.

In the tire vulcanization step, the surface of the tire is molded following the cavity surface of the mold. This mold is used repeatedly. Deposits and scratches may occur on the cavity surface of the mold that is repeatedly used. These deposits and flaws reduce the appearance quality of the tire. The mold is regularly repaired to maintain the visual quality of the tire.

Here, a mold repair method using the shot blasting device 2 will be described. This mold repair method includes a cleaning process, a repair process, and a recleaning process. The mold is cleaned in the cleaning process. In this cleaning process, foreign matters such as adhered substances are removed. In the repair process, adhered substances that cannot be removed in the cleaning process and flaws generated on the cavity surface are polished. In this way the mold is repaired.

The shot blasting device 2 is prepared in the recleaning step. The connection port 26 is connected to the compressed air supply pipe. The operator holds the grip 62 with the right hand. The finger of the right hand is placed on the lever 64. The auxiliary grip 66 is gripped with the left hand. In this way, the shot blasting device 2 is held and operated by the operator.

The operator matches the direction of the nozzle 12 with the repair location where the flaws and the like on the cavity surface are polished. The operator visually confirms the projection port 44 and the front opening 48a of the nozzle 12 and the repaired place through the cover 14. In this way, the nozzle 12 is directed to the repair location on the cavity surface. The shot blasting device 2 is pressed against the cavity surface. Complex irregularities are formed on the cavity surface to form the shape of the outer surface of the tire. The sponge 48 elastically deforms along the complicated uneven shape.

The operator pulls the lever 64. When the lever 64 is pulled, the switching valve 40 changes from the closed state to the open state. Compressed air is sent to the mixing chamber 10 through the air pipe 8 and further blown onto the cavity surface from the nozzle 12. The projection material is sucked from the tank 4 through the supply pipe 6 by the compressed air. The suctioned shot material is mixed with compressed air. The mixed shot material is projected on the cavity surface together with the compressed air. As a result, the surface condition such as the surface roughness of the cavity surface is adjusted. As a result, the difference in surface state between the repaired portion of the cavity surface and other portions is alleviated. The mold that has undergone the recleaning step is used again in the tire vulcanization step.

In this mold repair method, the surface of the repaired portion of the cavity surface is prepared by including the re-cleaning step. In the mold repaired by this mold repairing method, generation of shine on the tire surface is suppressed. This mold repair method contributes to the improvement of the appearance quality of the tire. Further, the visual inspection of the tire after the vulcanization process reduces the repair work of shine. This repair method contributes to reducing the number of man-hours required for the visual inspection of the tire after the vulcanization process.

Since the shot blasting device 2 includes the cover 14, scattering of the shot material is suppressed. The shot blasting device 2 includes a recovery pipe 18 that recovers the shot material projected from the nozzle 12. Compressed air is sent to the recovery pipe 18 by an air pipe 22. Thereby, the shot material is recovered from the cover 14 to the tank 4 through the recovery pipe 18. The opening 58 of the air nozzle 56 is oriented toward the flow path toward the tank 4 at the position of the opening 58. The projection material and air are sucked from the cover 14 by the compressed air. By providing this air pipe 22, the shot material is efficiently collected.

In this shot blasting device 2, since the shot material can be efficiently collected, the amount of the shot material to be prepared can be reduced. In this shot blasting device 2, the tank 4 can be downsized. The shot blasting device 2 can be reduced in size and weight. This shot blasting device 2 is suitable for carrying.

The tire mold has a weight of, for example, 300 kg. Forklifts and overhead cranes are required to carry this mold. Transporting such heavy objects requires a lot of man-hours including setup. This shot blasting device 2 can be easily carried by a worker. The shot blasting device 2 can perform shot blasting without moving the mold. In this shot blasting device 2, it is possible to prevent the productivity from being lowered due to the transportation of the heavy work piece.

In this shot blasting device 2, the cross-sectional area of the flow path of the air nozzle 56 of the air pipe 22 is gradually reduced toward the opening 58. The compressed air in the air pipe 22 is blown into the recovery pipe 18 through the air nozzle 56. The flow velocity of the air flowing through the air pipe 22 gradually increases toward the opening 58 of the air nozzle 56. A negative pressure is generated around the opening 58 of the air nozzle 56 by increasing the flow velocity of the compressed air. By this negative pressure, the projection material and the air are further sucked from the cover 14. By providing the air nozzle 56, the shot material can be collected more efficiently.

By making the intersecting angle θ between the flow passage of the recovery pipe 18 and the flow passage of the air pipe 22 an acute angle, the projection material and the air are easily sucked. From the viewpoint of improving the suction effect of the shot material and air, the intersecting angle θ is preferably less than 90°, more preferably 45° or less, and particularly preferably 30° or less.

In this tank 4, a partition plate 30 partitions the storage chamber 28 into a first chamber 32 and a second chamber 34. The partition plate 30 is arranged in front of the outlet 20b of the filter 20. The partition plate 30 is arranged so that the air and the shot material blown into the tank 4 from the outlet 20 are sprayed onto the partition plate 30. The provision of the partition plate 30 prevents the projection material in the first chamber 32 from rising up by the air blown into the tank 4. Since the rise of the shot material is suppressed, a predetermined amount of the shot material can be stably supplied from the first chamber 32.

The first chamber 32 and the second chamber 34 communicate with each other through a communication port 36. As a result, the shot material is supplied from the second chamber 34 to the first chamber 32 through the communication port 36. In the shot blasting device 2, the shot material projected on the mold is collected in the tank 4 and repeatedly projected from the nozzle 12. In this shot blasting device 2, the shot material can be projected for a longer time than before with a smaller amount of shot material than before. Since it can be used with a small amount of projection material, the tank 4 can be further downsized. The shot blasting device 2 can be further reduced in size and weight. This shot blasting device 2 is further suitable for carrying.

Since the filter 20 is provided between the tank 4 and the recovery pipe 18, air is discharged through the filter 20. As a result, the pressure of the air flowing into the tank 4 is reduced. Thereby, the projection material is easily sucked from the cover 14 to the recovery pipe 18. Further, the projection material is suppressed from rising in the tank 4. Since the cross-sectional area of the flow path of the filter body 20c is larger than that of the recovery pipe 18, the air discharge property is excellent. Further, clogging due to the shot material is also suppressed.

The filter body 20c is preferably made of a material that can be expanded and contracted by air. Since the filter body 20c is made of such a material that expands and contracts, the filter body 20c can be easily deformed. By deforming the filter body 20c, the projection material attached to the filter body 20 can be shaken off. A cloth or paper filter may be used as the expandable and contractible filter body 20c. By using cloth or paper filters used in commercial vacuum cleaners, the cost of filter replacement can be reduced.

In this shot blasting device 2, the sponge 48 is deformed along the cavity surface, and the cover 14 covers the periphery of the nozzle 12. Thereby, scattering of the shot material is suppressed. In particular, the projection material is easily scattered on the cavity surface having complicated irregularities. In particular, the sponge 48 is easily deformed along a complicated uneven shape. Since the shot blasting device 2 includes the sponge 48, scattering of the shot material is suppressed. With this shot blasting device 2, the shot material can be easily collected. From this point of view, the thickness of the sponge 48 in the front-rear direction may be any thickness as long as it can be deformed along the uneven shape of the workpiece.

The sponge 48 has a porous sponge shape and may be an open-cell type porous elastic body in which cells are continuously connected. The open-cell type sponge 48 has excellent air permeability. Thereby, the air blown from the nozzle 12 can be discharged through the sponge 48. The increase in air pressure around the front opening 48a is suppressed. Thereby, the projection material can be efficiently projected onto the cavity surface together with the air. From these viewpoints, the elastic cover 48 of the cover 14 may be made of a porous elastic body having excellent air permeability.

In this shot blasting device 2, the front opening 48a, the nozzle 12 and the cavity surface can be visually confirmed through the rear wall 46a of the cover 14. As a result, it is possible to accurately project the projection material at the intended position on the cavity surface. The shot blasting device 2 can efficiently perform shot blasting.

In the shot blasting device 2, the tank 4 and the cover 14 are attached and fixed to the main body 60. A recovery pipe 18 is attached and fixed to the cover 14. The tank 4, the cover 14, and the recovery pipe 18 are integrally attached to the main body 60 directly or indirectly. In this shot blasting device 2, the tank 4, the cover 14, and the recovery pipe 8 can be carried together with the main body 60.

In this shot blasting device 2, the connection port 26 is used by being connected to a compressed air supply pipe. The shot blasting device 2 can be used anywhere if compressed air is prepared. The shot blasting device 2 can be reduced in size and weight because only compressed air is required as a power source. The shot blasting device 2 can be used in various work environments because it can be made compact and lightweight and can be used only with compressed air.

In this shot blasting device 2, the flow rate of the air blown from the nozzle 12 is adjusted by the adjusting valve 42. Moreover, the flow rate of the air blown from the air nozzle 56 is adjusted by the adjustment valve 52. The suction force of the recovery pipe 18 can be adjusted by the adjustment valve 52. If the suction force of the recovery pipe 18 is too strong, the projection material will not be sufficiently projected onto the cavity surface. On the other hand, if the suction force of the recovery pipe 18 is too weak, the recovery rate of the shot material decreases. In this shot blasting device 2, the flow rate of the air blown from the nozzle 12 and the flow rate of the air blown from the air nozzle 56 can be appropriately adjusted by adjusting the adjusting valve 42 and the adjusting valve 52.

The shot blasting device 2 described above can be widely used for shot blasting. The shot blasting device 2 is suitable for use when the work piece to be shot blasted is a heavy object that is difficult to move or the surface to be shot blasted has irregularities. The shot blasting device 2 is particularly suitable for shot blasting a tire mold.

2... Shot blasting device 4... Tanks 8, 22, 24... Air piping 10... Mixing chamber 12... Nozzle 14... Cover 18... Recovery piping 20... Filter 20a・・・Inflow port 20b ・・・Outflow port 20c ・・・Filter body 28 ・・・Storage room 30 ・・・Partition plate 32 ・・・First chamber 34 ・・・Second chamber 36 ・・・Communication port 44 ... Projection port 46 ... Cover main body 46a ... Rear wall 46b ... Outer peripheral wall 48 ... Sponge 56 ... Air nozzle 58 ... Opening 60 ... Main body

Claims (9)

A tank including a stock room for storing shot material, a mixing room communicating with the stock room, a first air pipe for supplying air to the mixing room, a nozzle communicating with the mix room, and the nozzle A cover for covering the periphery of, a recovery pipe in communication with the cover, and a second air pipe for supplying air to the flow path of the recovery pipe,
The nozzle has an injection port for injecting the projection material and the air supplied by the first air pipe,
The cover has an opening, the opening of the cover is opened in a direction in which the projection material is ejected from the ejection port of the nozzle,
The cover is located upstream of the flow path of the recovery pipe,
The second air pipe has an opening,
The opening of the second air pipe is located in the flow path of the recovery pipe, and opens toward the downstream of the flow path of the recovery pipe ,
Equipped with a filter,
The filter includes an inflow port communicating with the recovery pipe, an outflow port communicating with the tank, and a filter body that allows air to pass therethrough,
The filter body forms a flow path from the inflow port to the outflow port,
A shot blasting device in which the cross-sectional area of the flow path formed by the filter body is larger than the cross-sectional area of the flow path of the recovery pipe . The shot blasting apparatus according to claim 1, wherein the cross-sectional area of the flow path of the second air pipe is gradually reduced toward the opening of the second air pipe. The intersection angle between the center line of the flow passage of the recovery pipe extending from the cover and the center line of the flow passage of the second air pipe is an acute angle at the position of the opening of the second air pipe. Or the shot blasting apparatus according to 2. The tank is equipped with a partition plate,
The partition plate divides the storage chamber into a first chamber communicating with the mixing chamber and a second chamber communicating with the recovery pipe,
The shot blasting apparatus according to any one of claims 1 to 3, wherein the partition plate is located on the front side in a direction in which air flows from the recovery pipe into the second chamber. The shot blasting apparatus according to claim 4, wherein the partition plate includes a communication port that communicates the first chamber and the second chamber. The cover includes a cover body and an elastic cover,
Shot blasting apparatus according to any one of claims 1-5 in which the elastic cover is attached to the front of the cover body. The shot blasting apparatus according to claim 6 , wherein the elastic cover is made of sponge. The cover has a rear wall that covers the rear of the periphery of the nozzle, and an outer peripheral wall that continuously covers the outer periphery of the periphery of the nozzle to the rear wall,
Shot blasting device according to any one of claims 1 to 7 in which at least a portion of said rear wall and said outer peripheral wall has an opening in the cover through which a portion from the visible capable permeable material. It has a body,
The tank is integrally attached and fixed to the main body,
Shot blasting device according to any one of claims 1 to 8, and the main body and the tank is to be portable integrally.

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