JP5569528B2 - Shot blasting equipment - Google Patents

Description

  The present invention relates to a shot blasting apparatus for projecting abrasive grains onto an object to be polished such as a metal part having an oxide film or burrs and removing the oxide film, burrs and the like from the object to be polished.

  Conventionally, as a shot blasting apparatus that removes an oxide film, burrs, and the like attached to an object to be cleaned (hereinafter also referred to as “object to be processed”), there is an apparatus described in Patent Document 1, for example. This shot blasting device is a device that carries an object to be processed into a storage body, projects and polishes abrasive grains by a shot projector (abrasive grain projector), and carries out the processed object from the storage body. is there.

Japanese Patent Publication No. 60-23947

  However, since this apparatus does not consider the processing of dust generated by scouring, the scouring process is not necessarily performed sufficiently safely on a die-cast product with a high possibility of dust explosion. A safe shot blasting apparatus is desired in order to perform a polishing process on a die-cast product that is highly likely to generate a dust explosion.

  The objective of this invention is providing the shot blasting apparatus which implement | achieves performing a sharpening process safely with respect to the die-cast product with high possibility of generating dust explosion.

  A shot blasting apparatus according to the present invention has a processing object carry-in / out port, and stores a processing object storage body that surrounds the processing object, and the processing object stored in the processing object storage body. From the abrasive grain projector for projecting abrasive grains to the object, the abrasive recovery mechanism for collecting the abrasive grains after projection in the object storage body and sending them to the abrasive grain projector, and the object storage body A wet dust collector that is connected via a conductive pipe and collects dust generated by projection of abrasive grains.

  The present invention realizes a safe polishing process for a die-cast product that is highly likely to cause a dust explosion.

It is a front view of a shot blasting device to which the present invention is applied. It is a top view of the shot blasting apparatus of FIG. It is a right view of the shot blasting apparatus of FIG. FIG. 2 is a view for explaining a polishing station S1 and a work station S2 in the shot blasting apparatus, and is a plan sectional view of a workpiece storage body. It is a figure for demonstrating the partition member for partitioning a cleaning station and a work station, and is a front view of a partition member. It is sectional drawing of the abrasive grain projector which comprises this shot blasting apparatus. It is sectional drawing of the bucket elevator of the abrasive grain collection | recovery mechanism which comprises this shot blasting apparatus. It is sectional drawing of the wet dust collector which comprises this shot blasting apparatus, and the backflow prevention valve provided in the inlet side of a wet dust collector. It is sectional drawing of the degassing valve provided in the upper part of a wet dust collector.

  Hereinafter, a shot blasting apparatus 1 to which the present invention is applied will be described with reference to the drawings. This shot blasting apparatus 1 is an apparatus for projecting and polishing abrasive grains onto an object to be polished such as an oxide film or a metal part having burrs, and removing the oxide film, burrs and the like from the object to be polished.

  The shot blasting apparatus 1 shown in FIGS. 1 to 3 includes a workpiece storage body 2, an abrasive projection machine 3, an abrasive collection mechanism 4, and a wet dust collector 5. The workpiece storage body 2 has a loading / unloading port 7 for a workpiece (not shown), and stores the workpiece to surround the workpiece. The abrasive grain projector 3 projects abrasive grains onto the object to be processed stored in the object storage body 2. The abrasive grain collection mechanism 4 collects the projected abrasive grains in the workpiece storage body 2 and sends them to the abrasive grain projector 3. The wet dust collector 5 is connected to the workpiece storage body 2 via a pipe 53 that is a conductive pipe, and collects dust generated by the projection of abrasive grains.

  The object storage body 2 includes a housing 11 that encloses the object to be processed, a partition member 12 that partitions the interior of the housing 11 into two or more spaces, and each space partitioned by the partition member 12. Hanger member 13 that suspends and holds the object to be processed, and drive means 14a and 14b that rotationally drive partition member 12 and hanger member 13. When the partition member 12 is brought to a predetermined position in the rotation direction, the partition member 12 and the casing 11 seal at least a space for projecting abrasive grains by the abrasive grain projector 3. Here, the sealing means that the dust generated in the space by the projection is sealed to the extent that it does not flow out of the space. When abrasive grains are projected by the abrasive grain projector 3 onto an object to be processed stored in one of the spaces partitioned by the partition member 12 (here, a sealed space), another space is projected. The aforementioned loading / unloading port 7 is provided at a position where the workpiece can be loaded / unloaded with respect to (a space other than the sealed space).

Specifically, as illustrated in FIGS. 1 to 4, the housing 11 includes a wall portion including a front wall portion 15, a back wall portion 16, a left wall portion 17, and a right wall portion 18, and these The ceiling board part 19 which obstruct | occludes the upper part of this wall part, and the bottom board member 20 provided facing the ceiling board part 19 below the wall part. As shown in FIG. 4, the left half portion 16a of the back wall portion 16 is inclined with respect to the right half portion 16b. The angle formed by the left half portion 16a and the right half portion 16b is larger than 90 ° and smaller than 180 °. As shown in FIG. 2, the abrasive grain projector 3 is disposed on the left half portion 16 a of the back wall portion 16.
By disposing the abrasive grain projector 3 in this way, the abrasive grain projector 3 can be directly opposed to the object to be processed (see FIG. 4), and the abrasive grains can be irradiated at an appropriate irradiation angle with respect to the object to be processed. Can be projected (even if the right half portion 16b is inclined). Furthermore, since a space for providing a later-described bucket elevator 32 on the right half portion 16b side of the back wall 16 is obtained, the apparatus can be reduced in size.
The right side wall 18 is provided with an inspection door 18b as shown in FIG. The front wall portion 15 is provided with a carry-in / out port 7. The loading / unloading port 7 may be provided with an opening / closing door capable of sealing the inside of the housing 11. However, in the two-station system consisting of the scouring station S1 and the work station S2 described here, only the scouring station S1 side needs to be sealed as described later, and the working station S2 side is always open to the outside air side. Has been. In other words, since the partition member 12 seals the blasting station S1 as will be described later, an opening having the same size as the work station S2 is provided to the loading / unloading port 7 so that the workpiece can be easily attached and detached. It becomes possible.

  For example, as shown in FIG. 4, the partition member 12 is configured by arranging a plurality (two in FIG. 4) of plate-like members in a direction substantially orthogonal to the flat cross section in the flat cross section of the apparatus. Each plate-like member has a V-shaped portion on both sides (hereinafter referred to as “second portion 12b” and “third portion 12c”, respectively) with respect to the central portion (hereinafter referred to as “first portion 12a”). It is formed by being bent in directions close to each other. Moreover, the partition member 12 composed of a plurality of plate-like members is integrated with the first portion 12a so as to be symmetric with respect to the main rotation axis (not shown). Furthermore, the partition member 12 is provided with a reinforcing member 12f for giving a predetermined strength enough to prevent deformation of the second portion 12b and the third portion 12c formed as described above.

As shown in FIGS. 4 and 5, both end portions of the partition member 12, that is, the vertical side edges of the second portion 12b and the third portion 12c, are plate-like in sliding contact with the housing 11 toward the outside. A rubber member 12d is attached. On the housing 11 side, abutting portions 17a and 18a that abut against the rubber member 12d at a predetermined position in the rotation direction and seal the gap between the inner wall surface of the housing 11 and the partition member 12 are the left side wall portion 17 and the right side wall. It is provided so as to extend from the inner surface of the portion 18.
You may comprise the ceiling board part 19 so that it may rotate with the partition member 12. FIG. Here, an example in which the ceiling board portion 19 is configured not to rotate will be described. A rubber member 12 e is provided at the upper edge of the partition member 12, and when the rubber member 12 e is in sliding contact with the ceiling plate portion 19, a gap between the partition member 12 and the ceiling plate portion 19 is sealed.
Further, the partition member 12 and the bottom plate member 20 are configured to rotate together. Therefore, the partition member 12 and the bottom plate member 20 may be configured to be integrated, but here, the lower side of the partition member 12 is not illustrated. A member is provided, and the lower side is also sealed by this rubber member.

  When the partition member 12 is positioned at a predetermined position in the rotation direction such that the rubber member 12d contacts the contact portions 17a and 18a, the partition member 12 seals the space on the side where the abrasive grains can be projected by the abrasive projector. Hereinafter, the position S1 where the sealed space shown in FIG. 4 or the like is located is referred to as “abrasion station”, and the position S2 where the space on the opposite side of the loading / unloading port 7 is located is referred to as “work station”. Here, an example in which the partition member 12 partitions the inside of the housing 11 into two spaces, that is, the space serving as the blasting station S1 and the space serving as the work station S2, has been described. You may comprise so that it may partition into space. In FIG. 4, Rk indicates the polishing range, and D <b> 1 indicates the abrasive grain projection direction by the abrasive grain projector 3.

  As shown in FIG. 4, the hanger member 13 is provided so as to be positioned in each of the two spaces partitioned by the partition member 12 described above. The hanger member 13 includes a column member 13a formed upright from the bottom plate member 20, a hanging member 13b formed so as to extend horizontally or obliquely upward from the column member, and the like. The hanger member 13 is a jig for attaching the object to be processed and may be any structure that can be attached so as to hold the object to be processed.

  In addition, although the thing of the system which provides the hanger member 13 as the to-be-processed object storage body 2 which comprises the shot blasting apparatus 1 was demonstrated here, you may comprise so that the hanger member 13 may not be provided. In the case where the hanger member is not provided, a table member for placing the object to be processed may be provided. The table member may be the bottom plate member 20 described above, but may be configured separately from the bottom plate member 20.

The driving unit 14 includes a driving unit 14 a that rotationally drives the partition member 12 and a driving unit 14 b that rotationally drives the hanger member 13. As shown in FIG. 1, the drive unit 14 a is configured to connect a motor 23 with a speed reducer provided on the base 21, a main rotating shaft (not shown) of the workpiece storage body 2, and a motor 23 with a speed reducer. It has a belt (not shown) and a bearing 22 through which the main rotating shaft passes. A roller chain may be used instead of the timing belt. The driving unit 14a rotates the bottom plate member 20 and the partition member 12 of the workpiece storage body 2 via the timing belt and the main rotation shaft by the motor 23.
On the other hand, the driving means 14b includes a rotation shaft (not shown) connected to the hanger member 13, a motor with a reduction gear (not shown) provided on the base 21, and a roller chain (not shown) that connects the rotation shaft and the motor with a reduction gear. Have. The driving means 14b rotates the hanger member 13 independently from the partition member 12 via the roller chain and the rotating shaft by this motor.
Therefore, in a state where the polishing station is hermetically sealed with the partition member 12, the abrasive grains are projected by the abrasive grain projector 3 while rotating the workpiece attached to the hanger member 13, and uniform polishing treatment can be performed. .

In the workpiece storage body 2 according to the present invention, abrasive grains are projected from the abrasive grain projector 3 to the workpiece at the polishing station S1, and the workpiece to be polished has been cleaned from the loading / unloading port 7 that is always open at the work station S2. The processing object is taken out and the object to be cleaned next is attached. That is, in the two-station system composed of the blasting station S1 and the work station S2, the work piece S2 can be removed and attached in parallel with the blasting process in the blasting station S1.
On the other hand, in a one-station type shot blasting apparatus, it is necessary to repeat the operations of opening the door, taking out the object to be cleaned, attaching the object to be processed, and further performing the cleaning after sealing the door. is there. Therefore, the 2-station system of the present invention can shorten the cycle time and reduce the labor of the operator as compared with the 1-station system.

Further, the shot blasting apparatus 1 is provided with a control unit 25 for controlling the driving means 14a for rotationally driving the partition member 12 in the control panel 26, and this control unit 25 is controlled by the timer management. Controls the rotation of the.
In detail, after the projection of the abrasive grains by the abrasive grain projector 3 is completed, time is required for collecting the dust remaining in the polishing station S1 by the wet dust collector 5. For this reason, if the partition member 12 is rotated immediately after the completion of projection, dust leaks out to the work station S2.
Therefore, for example, (i) the collection by the wet dust collector 5 is sufficient after the projection by simulation from the capability of the abrasive grain projector 3 and the wet dust collector 5 (including the dust collection air volume and the volume of the sealed space of the blasting station S1). (Ii) determine the actual standby time during trial run adjustment based on the simulated time, and (iii) input the actual standby time to the storage unit in the control unit 25 to It is possible to greatly reduce the dust leakage to the station S2. In addition to or in addition to the setting of the waiting time, a sensor is provided in the blasting station S1, and the control unit 25 controls the rotation operation of the partition member 12 based on the output from the sensor. May be.

As described above, by controlling the rotation operation of the partition member 12 by timer management, it is possible to reduce the dust leakage of S2 from the polishing station S1 to the work station.
In addition, in the case of a manual one-station system, there is a problem that dust is leaked when the door is accidentally opened during the cleaning operation. This problem can also be solved by controlling the rotation operation of the partition member 12 by timer management.

  As shown in FIG. 6, the abrasive grain projector 3 includes an impeller 27, a distributor 28, and a control gauge 29. The control gauge 29, which is a fixed part, is made of beryllium copper, and is configured such that no sparks are produced even when it comes into contact with the impeller 27 and distributor 28 of the rotating part. The shot blasting apparatus 1 including the control gauge 29 prevents the occurrence of sparks due to the collision of metals in the conventional abrasive grain projector 3.

As shown in FIG. 3, the abrasive grain recovery mechanism 4 includes a screw conveyor 31, a bucket elevator 32, and a wind-selective separator 33. The screw conveyor 31 is provided at the bottom of the shot blasting apparatus 1 from the front side to the back side when viewed from the operator. The bucket elevator 32 is provided along the back wall 16 of the shot blasting apparatus 1 and is formed to rise from the carry-out port of the screw conveyor 31. The wind-selective separator 33 is attached to the carry-out port of the bucket elevator 32 at the upper part of the shot blasting apparatus 1, and removes foreign matters such as dust generated from die-cast products or abrasive grains by grinding, crushed abrasive grains, oxide film, burrs and the like. The abrasive grains are separated by wind power, and the separated abrasive grains are guided to the abrasive projector 3 by a guide tube (not shown).
Here, as shown in FIG. 7, the bucket elevator 32 has a bucket 34 made of conductive nylon and a belt 35 that drives the bucket 34. Since the abrasive grain recovery mechanism 4 uses the conductive nylon bucket 34, the spark 35 does not appear even if the belt 35 is loosened and the bucket 34 comes into contact with the iron casing 36. Thereby, the dust explosion resulting from the dust which generate | occur | produced from the die-cast product or the abrasive grain by polishing is prevented.

As shown in FIG. 8, the wet dust collector 5 is provided with a blower 42 at the outlet nozzle 41, and has a draining plate (eliminator) 43 and an S-shaped impeller portion 44. Air containing dust that has flowed into the wet dust collector 5 by the blower 42 passes through the water film 44a of the S-shaped impeller portion 44, and is collected by the cleaning action and centrifugal force.
The S-shaped impeller portion 44 functions as an efficient dust collecting portion due to a collision when the dust contained in the air violently mixes with water and the centrifugal force. The dust collected by the S-shaped impeller 44 is deposited in the water tank below the dust collector main body 45 as a slurry. On the other hand, the air cleaned by the S-shaped impeller 44 is drained by the drain plate 43 and discharged from the outlet nozzle 41.
In FIG. 8, inspection lids 45 c and 45 d are provided on the nozzles 45 a and 45 b provided near the center portion of the dust collector main body 45. Moreover, the arrow represents the flow direction of air.

  The fan impeller (blade part) constituting the blower 42 of the wet dust collector 5 is made of aluminum. The shot blasting apparatus 1 having an aluminum fan impeller prevents the occurrence of sparks due to collision between metals. This prevents dust explosion caused by the dust generated from the die-cast product or abrasive grains by polishing and the explosion of hydrogen gas generated by the reaction between the dust and water.

Moreover, the wet dust collector 5 has the gas vent valve 46 provided in the upper part of the dust collector main body 45, as shown in FIG. The gas vent valve 46 includes a spring member 47 that urges the valve body 48 toward the outside of the wet dust collector 5 (the side that opens the gas vent valve 46). The valve body 48 is closed against the urging force of the spring member 47 by the negative pressure, and the valve body 48 is opened while the blower 42 is stopped. As a result, even when hydrogen gas is generated when the blower 42 is stopped, the gas vent valve 46 reliably discharges hydrogen to the outside and prevents the wet dust collector 5 from being filled with hydrogen. it can. The spring member 47 is attached to an attachment member 46 b that is passed into the upper nozzle portion 46 a of the dust collector main body 45 and biases the valve body 48 toward the outside of the wet dust collector 5.
The shot blasting apparatus 1 having the gas vent valve 46 has a high possibility of dust explosion during the blasting process, and also die-cast products in which hydrogen gas is generated when the dust reacts with water, such as magnesium alloy and aluminum alloy. Die-cast products made of steel can be safely polished. In addition, the wet dust collector 5 of the shot blasting apparatus 1 is disposed outdoors and prevents the hydrogen gas discharged from the gas vent valve 46 from being filled indoors.

Further, the wet dust collector 5 has a rupturable plate 49 as an explosion-dissipating mechanism that is provided on the upper portion of the dust collector main body 45 and is activated and opened when the pressure in the dust collector main body 45 becomes a certain level or more. The rupturable plate 49 is made of, for example, SUS, and prevents the wet dust collector 5 from being destroyed by radiating a blast by bursting the plate in the event of an explosion. The strength of the rupturable plate 49 is ¼ or less of the design pressure resistance of the apparatus main body.
The shot blasting apparatus 1 having the rupture disc 49 in addition to the gas vent valve 46 is highly likely to generate a dust explosion during the cleaning process, and further, a die casting product in which hydrogen gas is generated by the reaction of the dust with water, For example, die casting products made of magnesium alloy or aluminum alloy can be safely polished.
The explosion-dissipating mechanism is not limited to the rupturable plate 49. For example, a door member to which a predetermined weight is added or normally closed by its own weight, and the door member is rotatably held. It is also possible to use a so-called hinged door-type radiation mechanism in which the door member is opened by a blast during an explosion. In addition, the explosion-dissipating mechanism has, for example, a panel member and a fitting nozzle portion for fitting and holding the panel member in a normal state. It may be a so-called detachment panel type radiation mechanism that is operated. Further, the explosion-dissipating mechanism such as the rupturable plate 49 is not limited to being provided at the upper portion of the dust collector main body 45, and may be provided at, for example, the side surface portion. In other words, it may be provided in the nozzle on the side surface or in the pipe connected to the nozzle and directed upward, and the blast may be diffused upward from there.

Inside the inlet nozzle 50 of the wet dust collector 5, as shown in FIG. 8, a blast buffer damper 51, which is a backflow prevention valve, is provided. The blast buffer damper 51 has a damper member 52 that is normally opened and is closed when a reverse flow such as a blast occurs. In the event of an explosion, the blast buffer damper 51 prevents the blast from flowing from the wet dust collector 5 to the workpiece storage body 2 when the damper member 52 is closed.
Since the shot blasting apparatus 1 having the blast buffer damper 51 that is a backflow prevention valve can prevent the workpiece storage body 2 side from being destroyed by the blast, there is a possibility that a dust explosion may occur during the blasting process. In addition, die casting products that generate hydrogen gas when the dust reacts with water, for example, die casting products made of magnesium alloy or aluminum alloy can be safely polished.
The installation location of the blast buffer damper 51 is not limited to the inside of the inlet nozzle 50 of the wet dust collector 5. For example, if the wet dust collector 5 and the workpiece storage body 2 are provided, the workpiece storage body 2 can be protected. If it is provided between the wet dust collector 5 and a settling chamber 55 described later, the settling chamber 55 can also be protected.

  The shot blasting apparatus 1 includes a gas vent valve 46, a rupture plate 49, and a blast buffer damper 51, thereby projecting abrasive grains onto a workpiece to be processed such as a magnesium alloy die cast or an aluminum alloy die cast, and the surface of the workpiece to be processed. This is particularly effective when processing. In the case of magnesium alloy die casting, the abrasive grain projected from the abrasive grain projector 3 is a zinc-based projection material. In the case of aluminum alloy die casting, the abrasive grain projected from the abrasive grain projector 3 is an aluminum-based projection. It is a material.

As shown in FIG. 3, a settling chamber 55 is provided in the middle of a pipe 53 extending from the workpiece storage body 2 to the wet dust collector 5. In addition, the arrow shown in FIG. 3 represents the flow direction of the air containing dust.
In the upper part of the settling chamber 55, an inlet 55a and an outlet 55b are provided on the side close to the workpiece storage body 2 and the side close to the wet dust collector 5, respectively. In addition, a barrier member 56 that extends downward from the top plate 55c is provided inside the settling chamber 55. The barrier member 56 has a function of earning a residence time by diverting the flow of air including dust flowing in from the inlet 55a to the lower side and guiding it to the outlet side. Further, the barrier member 56 is provided at a position closer to the inlet 55a than the middle between the inlet 55a and the outlet 55b. Thereby, the flow velocity of the upward flow toward the outlet 55b becomes slower than the flow velocity of the downward flow from the inlet 55a. As a result, burrs or the like that are heavier than the dust are separated from the air containing the dust flowing into the wet dust collector 5 and fall, and are discharged from the lower discharge port 55d.

  Further, in the shot blasting apparatus 1, not only the motor is a safety-enhanced explosion-proof type but also the secondary side wiring is a safety-enhanced explosion-proof wiring. Furthermore, in the shot blasting apparatus 1, the limit switch, the proximity sensor, and the like are configured to pass through a barrier relay, and have an intrinsically safe explosion-proof structure. Here, the intrinsically safe explosion-proof structure means a structure that has been confirmed by an ignition test or the like in a public engine so that the explosive gas is not ignited by a spark or a high-temperature part that is generated in a normal state or an accident. To do. Furthermore, in the shot blasting apparatus 1, the control panel 26 has a dust-proof structure and is configured to pressurize the inside of the control panel with air (air purge) and be separated from the apparatus main body (such as a polishing station). Therefore, a safe polishing process is realized.

A shot blasting method using the shot blasting apparatus 1 as described above will be described with reference to FIGS. First, the workpiece is attached to the hanger member 13 at the work station S2. Next, by rotating the partition member 12 and the hanger member 13 around the main rotation axis, the attached workpiece is positioned on the blast station S1 side, and the space on the blast station S1 side is sealed. Next, at the polishing station S1, the abrasive is projected onto the object to be processed by the abrasive grain projector 3 to perform the cleaning. At this time, the work piece S2 is attached and detached in parallel at the work station S2. After the projection is stopped, the partition member 12 is kept waiting for a predetermined time (ventilation time). After a lapse of a predetermined time, the partition member 12 and the hanger member 13 are rotated around the main rotation shaft, and the object to be processed after the polishing process is sent to the work station S2. The projected abrasive grains are sent to the abrasive grain projector 3 by the abrasive grain collection mechanism 4, and air containing dust mixed with the abrasive grains is conveyed to the wet dust collector 5 through the pipe 53. In the wet dust collector 5, dust in the air is collected by the water film 44 a, the collected dust is precipitated in a slurry state, and the air after dust collection is discharged from the outlet nozzle 41 by the blower 42.
Note that the dust collection by the wet dust collector 5 may be performed only during the cleaning and ventilation time or continuously during the operation of the shot blasting apparatus 1.

  The shot blasting apparatus 1 to which the present invention is applied includes a workpiece storage body 2, an abrasive grain projector 3, an abrasive grain recovery mechanism 4, and a wet dust collector 5 as described above. Achieving safe polishing for die casting products that are likely to occur.

  In the shot blasting apparatus 1, the wet dust collector 5 includes a gas vent valve 46, a rupture plate 49 as a diffusion mechanism, and a blast buffer damper 51 as a backflow prevention valve, so that there is a high possibility that a dust explosion will occur. In addition, it is possible to safely perform a blast treatment on a die-cast product in which hydrogen gas is generated when this dust reacts with water, for example, a die-cast product made of magnesium alloy or aluminum alloy.

  Further, when the workpiece storage body 2 of the shot blasting apparatus 1 has a housing 11, a partition member 12, a hanger member 13, a driving means 14 and the like, and the partition member 12 is at a predetermined position in the rotation direction, the partition member 12 is a so-called multi-station system (in the above-described two-station system) in which at least one sealed space surrounded by the housing 11 and the housing 11 is formed. Since the workpiece can be removed and attached at the station, the cycle time is shortened. In addition, since two or more stations are provided when compared with the same cycle time as the one-station method, it is possible to set a sufficient dust collection time in the station that performs the polishing process, resulting in a dust. The removal rate can be increased. That is, the shot blasting apparatus 1 has a higher production capacity than the one-station polishing apparatus and enables a careful surface finish. Moreover, since the shot blasting apparatus 1 is configured to manage the rotation of the partition member 12 by the control unit, it is possible to reduce dust leakage from the polishing station to the work station.

  In the shot blasting apparatus 1, a non-ferrous material was appropriately selected in order to prevent heat generation due to rubbing between irons and friction. For example, since the material for preventing the occurrence of sparks is used for the control gauge 29, the bucket 34 of the bucket elevator 32, and the fan impeller of the blower 42, a safe polishing process can be performed without impairing the function of the apparatus. . Furthermore, since it is possible to minimize the explosion damage by the wet dust collector 5, the working environment of the worker is improved and the blasting process can be performed safely.

DESCRIPTION OF SYMBOLS 1 Shot blasting apparatus 2 To-be-processed object storage body 3 Abrasive grain projector 4 Abrasive grain collection | recovery mechanism 5 Wet dust collector

Claims (9)

A workpiece storage body having a loading / unloading port for the workpiece, and storing the workpiece to surround the workpiece;
An abrasive projector for projecting abrasive grains to the object to be processed stored in the object to be processed;
An abrasive recovery mechanism for recovering the abrasive grains after projection in the workpiece storage body and sending them to an abrasive projector;
While being a shot blasting device provided with a wet dust collector that collects dust generated by projection of abrasive grains connected from the workpiece storage body through a conductive pipe ,
On the inlet side of the wet dust collector, a blast buffer damper is provided,
The shot blasting device is a device for projecting abrasive grains on a workpiece to be processed by magnesium alloy die casting, and performing surface treatment of the magnesium alloy die casting,
The abrasive grains projected from the abrasive grain projector are zinc-based projectiles,
Shot blasting device . A workpiece storage body having a loading / unloading port for the workpiece, and storing the workpiece to surround the workpiece;
An abrasive projector for projecting abrasive grains to the object to be processed stored in the object to be processed;
An abrasive recovery mechanism for recovering the abrasive grains after projection in the workpiece storage body and sending them to an abrasive projector;
While being a shot blasting device provided with a wet dust collector that collects dust generated by projection of abrasive grains connected from the workpiece storage body through a conductive pipe ,
On the inlet side of the wet dust collector, a blast buffer damper is provided,
The shot blasting apparatus is an apparatus for projecting abrasive grains onto an object to be processed which is an aluminum alloy die casting, and performing surface treatment of the aluminum alloy die casting,
The abrasive grains projected from the abrasive grain projector are aluminum-based projection materials.
Shot blasting device . The shot blasting apparatus according to claim 1 or 2, wherein the control gauge constituting the abrasive grain projector is made of beryllium copper. The shot blasting device according to any one of claims 1 to 3, wherein the bucket elevator constituting the abrasive grain recovery mechanism uses a conductive nylon bucket. The shot blasting device according to any one of claims 1 to 4, wherein the fan impeller constituting the wet dust collector is made of aluminum. The shot according to any one of claims 1 to 5, wherein the wet dust collector is provided on an upper portion of a dust collector body, and has a degassing valve that is closed during operation of the blower and opened when the blower is stopped. Blasting device. The shot blast according to any one of claims 1 to 6, wherein the wet dust collector is attached to the dust collector main body, and has a diffusion mechanism that is activated and opened when a pressure in the dust collector main body exceeds a certain level. apparatus. The object storage body includes a housing for storing the object to be processed,
A partition member for partitioning the inside of the housing into two or more spaces;
A hanger member that is provided in each of the spaces partitioned by the partition member and suspends and holds the workpiece;
Drive means for rotationally driving the partition member and the hanger member;
When the partition member is set to a predetermined position in the rotation direction, the partition member and the housing seal at least a space for projecting abrasive grains by the abrasive grain projector,
A space other than the sealed space when the abrasive grain is projected onto the workpiece stored in the sealed space among the spaces partitioned by the partition member. The shot blasting device according to any one of claims 1 to 7 , wherein the loading / unloading port is provided at a position where the workpiece can be loaded / unloaded. The object storage body includes a housing for storing the object to be processed,
A partition member for partitioning the inside of the housing into two or more spaces;
A table member that is provided integrally with or separately from the housing and on which the object to be processed is placed;
Driving means for rotationally driving the partition member and the table member;
When the partition member is set to a predetermined position in the rotation direction, the partition member and the housing seal at least a space for projecting abrasive grains by the abrasive grain projector,
A space other than the sealed space when the abrasive grain is projected onto the workpiece stored in the sealed space among the spaces partitioned by the partition member. The shot blasting device according to any one of claims 1 to 7 , wherein the loading / unloading port is provided at a position where the workpiece can be loaded / unloaded.

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