WO2012066687A1 - Shot blasting device - Google Patents
Shot blasting device Download PDFInfo
- Publication number
- WO2012066687A1 WO2012066687A1 PCT/JP2010/071971 JP2010071971W WO2012066687A1 WO 2012066687 A1 WO2012066687 A1 WO 2012066687A1 JP 2010071971 W JP2010071971 W JP 2010071971W WO 2012066687 A1 WO2012066687 A1 WO 2012066687A1
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- WO
- WIPO (PCT)
- Prior art keywords
- shot blasting
- workpiece
- partition member
- processed
- blasting apparatus
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C11/00—Selection of abrasive materials or additives for abrasive blasts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
- B24C9/003—Removing abrasive powder out of the blasting machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
- B24C9/006—Treatment of used abrasive material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Definitions
- 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.
- Patent Document 1 there is an apparatus as described in Patent Document 1 as a shot blasting apparatus that removes an oxide film, burrs, and the like attached to an object to be polished (hereinafter also referred to as “object to be processed”).
- 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.
- 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.
- An object of the present invention is to provide a shot blasting apparatus that realizes a safe polishing process for a die-cast product that is highly likely to cause a dust explosion.
- a shot blasting apparatus 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.
- 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 generate a dust explosion.
- 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
- 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
- drive means 14a and 14b that rotationally drive partition member 12 and hanger member 13.
- 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).
- the housing 11 has 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
- 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 °.
- the abrasive grain projector 3 is disposed on the left half portion 16 a of the back wall portion 16.
- the abrasive grain projector 3 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.
- 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.
- the partition member 12 is configured such that a plurality (two in FIG. 4) of plate-like members are arranged 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.
- 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).
- 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.
- 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.
- the partition member 12 seals the space on the side where the abrasive grains can be projected by the abrasive grain projector when the rubber member 12d is positioned at a predetermined position in the rotational direction so as to contact the contact portions 17a and 18a.
- abrasion station the position S1 where the sealed space shown in FIG. 4 or the like is located
- work station the position S2 where the space on the opposite side of the loading / unloading port 7 is located.
- 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.
- Rk indicates the polishing range
- D ⁇ b> 1 indicates the abrasive grain projection direction by the abrasive grain projector 3.
- the hanger member 13 is provided so as to be located in each of the two spaces partitioned by the partition member 12 as shown in FIG.
- 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.
- the hanger member 13 may not be 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.
- 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.
- 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.
- 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. .
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- the abrasive grain projector 3 has an impeller 27, a distributor 28, and a control gauge 29 as shown in FIG.
- 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.
- 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, and burrs
- 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).
- the bucket elevator 32 has a bucket 34 made of conductive nylon and a belt 35 that drives the bucket 34.
- 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
- 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.
- the air cleaned by the S-shaped impeller 44 is drained by the drain plate 43 and discharged from the outlet nozzle 41.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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 1 ⁇ 4 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.
- the explosion-dissipating mechanism has, for example, a panel member and a fitting nozzle portion that fits and holds the panel member in a normal state. When the blast is blown, the panel member is released from the fitting by the blast and the nozzle portion is opened. It may be a so-called detachment panel type radiation mechanism that is operated.
- 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.
- a blast buffer damper 51 which is a backflow prevention valve, is provided 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 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 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 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 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 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 inside the
- 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.
- 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.
- a workpiece to be processed such as a magnesium alloy die cast or an aluminum alloy die cast
- the abrasive grain projected from the abrasive grain projector 3 is a zinc-based projection material.
- the abrasive grain projected from the abrasive grain projector 3 is an aluminum-based projection. It is a material.
- 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.
- the arrow shown in FIG. 3 represents the flow direction of the air containing dust.
- 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.
- 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.
- 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.
- the shot blasting apparatus 1 not only the motor is a safety explosion-proof type but also the secondary side wiring is a safety 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.
- 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.
- 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. 2 to 4 and FIG.
- the workpiece is attached to the hanger member 13 at the work station S2.
- 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.
- the polishing station S1 the abrasive is projected onto the object to be processed by the abrasive grain projector 3 to perform the cleaning.
- the work piece S2 is attached and detached in parallel at the work station S2.
- the partition member 12 is kept waiting for a predetermined time (ventilation 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- a non-ferrous material was appropriately selected in order to prevent heat generation due to rubbing between irons and friction.
- 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. .
- the working environment of the worker is improved and the blasting process can be performed safely.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
Description
砥粒投射機3をこのように配置することにより、砥粒投射機3を被処理物に正対させることが可能になり(図4参照)、被処理物に対し適正な照射角度で砥粒を投射することができる(右半分部分16bを傾斜させても同様)。さらに、背面壁部16の右半分部分16b側に後述のバケットエレベータ32を設けるスペースが得られるので、装置の小型化を図ることができる。
右側壁部18には、図3に示すように点検用扉18bが設けられる。正面壁部15には、搬入出口7が設けられている。尚、搬入出口7には、筐体11内を密閉可能なような開閉扉を設けるように構成してもよい。しかし、ここで説明する研掃ステーションS1と作業ステーションS2から成る2ステーション方式においては、後述のように研掃ステーションS1側のみが密閉されていればよく、作業ステーションS2側は常に外気側に開放されている。換言すると、仕切り部材12が後述のように研掃ステーションS1を密閉するので、搬入出口7に対して被処理物の取り付けや取り外しをしやすいように作業ステーションS2と同等の大きさの開口を設けることが可能になる。 Specifically, as shown in FIGS. 1 to 4, the
By disposing the
The
天井板部19は、仕切り部材12とともに回転させるように構成してもよい。ここでは、天井板部19は、回転しないように構成した例について説明する。仕切り部材12の上端縁部にはゴム部材12eが設けられており、このゴム部材12eが天井板部19と摺接することにより、仕切り部材12と天井板部19の隙間が密閉される。
さらに、仕切り部材12と底板部材20とが一緒に回転するように構成されており、そのため、一体化するように構成されていてもよいが、ここでは、仕切り部材12の下部側も図示しないゴム部材が設けられるようにされており、このゴム部材により下方側も密閉している。 As shown in FIGS. 4 and 5, both end portions of the
You may comprise the
Further, the
一方、駆動手段14bは、ハンガー部材13に接続される図示しない回転軸と、基台21に設けられる図示しない減速機付モータと、回転軸及び減速機付モータを連結する図示しないローラーチェーンとを有する。駆動手段14bは、このモータによりローラーチェーン及び回転軸を介して、ハンガー部材13を仕切り部材12から独立に回転させる。
従って、仕切り部材12で研掃ステーションを密閉した状態で、ハンガー部材13に取り付けた被処理物を回転させながら砥粒投射機3で砥粒を投射し、均一な研掃処理を行なうことができる。 The driving
On the other hand, the driving means 14b includes a rotation shaft (not shown) connected to the
Therefore, in a state where the polishing station is hermetically sealed with the
これに対し、1ステーション方式のショットブラスト装置では、扉を開けて研掃済みの被処理物を取り出し、次いで被処理物を取付け、さらに扉を密閉した後に研掃を行うという動作を繰り返す必要がある。従って、この発明の2ステーション方式は、1ステーション方式と比べてサイクルタイムを短縮できるとともに作業者の労力を低減することができる。 In the
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.
詳しくは、砥粒投射機3による砥粒の投射が終了した後、研掃ステーションS1内に残留する粉塵を湿式集塵機5で捕集するための時間が必要である。このため、投射完了後直ちに仕切り部材12を回転させると作業ステーションS2側に粉塵が漏出する。
そこで、例えば、(i)砥粒投射機3や湿式集塵機5の能力(集塵風量や研掃ステーションS1の密閉空間の体積も含む)からシミュレーションにより、投射終了後に湿式集塵機5による捕集が十分に行われる時間を割り出し、(ii)シミュレーションした時間を基に試運転調整時に実際の待機時間を決定し、(iii)この実際の待機時間を制御部25内の記憶部に入力することで、作業ステーションS2への粉塵漏れを大幅に減少することを実現する。尚、この待機時間の設定に換えて若しくは設定に加えて、研掃ステーションS1内にセンサを設けて、このセンサからの出力に基づいて制御部25が仕切り部材12の回転動作を制御するようにしてもよい。 Further, the
In detail, after the projection of the abrasive grains by the
Therefore, for example, (i) the collection by the
また、手動の1ステーション方式の装置の場合、開閉扉を研掃作業中に誤って開けたとき粉塵が漏出するという問題があった。仕切り部材12の回転動作をタイマー管理で制御することにより、この問題も解決できる。 As described above, by controlling the rotation operation of the
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
ここで、バケットエレベータ32は、図7に示すように、導電性ナイロン製のバケット34と、このバケット34を駆動するベルト35とを有している。砥粒回収機構4は、導電性ナイロン製バケット34を用いていることから、ベルト35が緩んでバケット34が鉄製のケーシング36に接触しても火花が出ない構造とされている。これにより、研掃によってダイカスト製品または砥粒から発生した粉塵に起因する粉塵爆発が防止される。 As shown in FIG. 3, the abrasive
Here, as shown in FIG. 7, the
S字インペラー部44は、空気に含まれる粉塵が水と激しく交じり合うときの衝突と、遠心力とにより、効率の良い集塵部として機能する。S字インペラー部44で捕集された粉塵は、スラリーとして集塵機本体45の下部の水槽に沈殿する。一方S字インペラー部44で洗浄された空気は、水切板43で水切りされて出口ノズル41より排出される。
尚、図8中、集塵機本体45の中心部分付近に設けられたノズル45a,45bには、点検蓋45c,45dが設けられる。また、矢印は空気の流動方向を表す。 As shown in FIG. 8, the
The S-shaped
In FIG. 8,
ガス抜き弁46を有するショットブラスト装置1は、研掃処理時に粉塵爆発の発生する可能性が高く、しかもこの粉塵が水と反応することにより水素ガスが発生するダイカスト製品、例えばマグネシウム合金やアルミニウム合金製のダイカスト製品を安全に研掃処理することができる。また、ショットブラスト装置1の湿式集塵機5は、屋外に配置されており、ガス抜き弁46から排出された水素ガスが屋内に充満することを防止している。 Moreover, the
The
ガス抜き弁46に加えて破裂板49を有するショットブラスト装置1は、研掃処理時に粉塵爆発の発生する可能性が高く、しかもこの粉塵が水と反応することにより水素ガスが発生するダイカスト製品、例えばマグネシウム合金やアルミニウム合金製のダイカスト製品を安全に研掃処理することができる。
尚、爆発放散機構は、破裂板49に限られるものではなく、例えば、所定の重りが付加されるかその自重により通常時は閉とされるドア部材と、このドア部材を回動自在に保持する蝶番部材とを有し、爆発時には、ドア部材が爆風により開動作される所謂蝶番ドア式放散機構でもよい。また、爆発放散機構は、例えば、パネル部材と、通常時はこのパネル部材を嵌め込み保持する嵌合ノズル部とを有し、爆風時には、パネル部材が爆風により嵌め込みが解除されてこのノズル部分が開動作される所謂離脱パネル式放散機構でもよい。また、この破裂板49等の爆発放散機構は、集塵機本体45の上部に設けられるに限られるものではなく、例えば、側面部に設けるようにしてもよい。すなわち側面部のノズル又はそのノズルに接続されるとともに上方に向けられた配管中に設けるようにしてそこから上方に向けて爆風を放散するようにしてもよい。 Further, the
The
The explosion-dissipating mechanism is not limited to the
逆流防止弁である爆風緩衝ダンパ51を有するショットブラスト装置1は、被処理物収納体2側が爆風により破壊されることを防止することができるため、研掃処理時に粉塵爆発の発生する可能性が高く、しかもこの粉塵が水と反応することにより水素ガスが発生するダイカスト製品、例えばマグネシウム合金やアルミニウム合金製のダイカスト製品を安全に研掃処理することができる。
尚、爆風緩衝ダンパ51の設置場所は、湿式集塵機5の入口ノズル50の内部に限られない。例えば湿式集塵機5と被処理物収納体2との間に設けられていれば、被処理物収納体2を保護することができる。湿式集塵機5と後述のセトリングチャンバ55との間に設けられていれば、セトリングチャンバ55をも保護することができる。 Inside the
Since the
The installation location of the
セトリングチャンバ55の上部には、被処理物収納体2に近い側、及び湿式集塵機5に近い側のそれぞれに、入口55a、及び出口55bが設けられている。また、セトリングチャンバ55の内部には、天板55cから下方に向けて延び出す障壁部材56が設けられている。障壁部材56は、入口55aから流入した粉塵を含む空気の流れを下方側に迂回させて出口側に導くことで、滞留時間を稼ぐという機能がある。また、障壁部材56は、入口55aと出口55bとの中間より入口55aに近接した位置に設けられている。これにより、出口55bへ向かう上昇流の流速の方が、入口55aからの下降流の流速より遅くなる。この結果、湿式集塵機5に流入する粉塵を含む空気から、粉塵よりも重量が大きいバリ等が分離されて落下し、下方側の排出口55dから排出される。 As shown in FIG. 3, a settling
In the upper part of the settling
なお、湿式集塵機5による集塵は、研掃及び換気時間中のみ行ってもよいし、ショットブラスト装置1の稼働中連続して行ってもよい。 A shot blasting method using the
Note that the dust collection by the
2 被処理物収納体
3 砥粒投射機
4 砥粒回収機構
5 湿式集塵機 DESCRIPTION OF
Claims (11)
- 被処理物の搬入出口を有し、該被処理物を包囲するように収納する被処理物収納体と、
該被処理物収納体に収納された該被処理物に対して砥粒を投射する砥粒投射機と、
前記被処理物収納体内の投射後の砥粒を回収して砥粒投射機に送る砥粒回収機構と、
前記被処理物収納体から導通配管を介して接続され砥粒の投射により発生した粉塵を捕集する湿式集塵機とを備えるショットブラスト装置。 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;
A shot blasting apparatus comprising: a wet dust collector connected to the workpiece storage body via a conductive pipe and collecting dust generated by the projection of abrasive grains. - 前記湿式集塵機は、集塵機本体の上部に設けられ、送風機運転中は閉とされ、送風機停止中に開とされるガス抜き弁を有する請求項1記載のショットブラスト装置。 The shot blasting apparatus according to claim 1, wherein the wet dust collector is provided on an upper portion of the dust collector body, and has a gas vent valve that is closed when the blower is in operation and opened when the blower is stopped.
- 前記湿式集塵機は、集塵機本体に取り付けられ、集塵機本体内の圧力が一定以上になったときに作動して開放する放散機構を有する請求項2記載のショットブラスト装置。 3. The shot blasting apparatus according to claim 2, wherein the wet dust collector is attached to a dust collector main body and has a diffusion mechanism that is activated and opened when a pressure in the dust collector main body becomes a predetermined level or more.
- 前記湿式集塵機の入口側には、逆流防止弁が設けられている請求項3記載のショットブラスト装置。 The shot blasting apparatus according to claim 3, wherein a backflow prevention valve is provided on an inlet side of the wet dust collector.
- 前記被処理物収納体は、該被処理物を囲むように収納する筐体と、
該筐体内部を二以上の空間に仕切る仕切り部材と、
該仕切り部材により仕切られた各空間のそれぞれに設けられ、被処理物を吊って保持するハンガー部材と、
前記仕切り部材及び前記ハンガー部材を回転駆動する駆動手段とを有し、
前記仕切り部材が回転方向の所定位置にされたとき、前記仕切り部材と前記筐体は、少なくとも前記砥粒投射機により砥粒を投射する空間を密閉し、
前記仕切り部材によって仕切られた空間の内の前記密閉された空間に収納された被処理物に対して前記砥粒投射機により砥粒を投射している際に、前記密閉された空間以外の空間に対して被処理物の搬入出を行える位置に前記搬入出口が設けられている請求項4記載のショットブラスト装置。 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 apparatus according to claim 4, wherein the loading / unloading port is provided at a position where the workpiece can be loaded / unloaded. - 前記被処理物収納体は、該被処理物を囲むように収納する筐体と、
該筐体内部を二以上の空間に仕切る仕切り部材と、
前記筐体と一体に又は別体に設けられ、被処理物を載置するテーブル部材と、
前記仕切り部材及びテーブル部材を回転駆動する駆動手段とを有し、
前記仕切り部材が回転方向の所定位置にされたとき、前記仕切り部材と前記筐体は、少なくとも前記砥粒投射機により砥粒を投射する空間を密閉し、
前記仕切り部材によって仕切られた空間の内の前記密閉された空間に収納された被処理物に対して前記砥粒投射機により砥粒を投射している際に、前記密閉された空間以外の空間に対して被処理物の搬入出を行える位置に前記搬入出口が設けられている請求項4記載のショットブラスト装置。 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 apparatus according to claim 4, wherein the loading / unloading port is provided at a position where the workpiece can be loaded / unloaded. - 前記砥粒投射機を構成するコントロールゲージは、ベリリウム銅製である請求項5または6記載のショットブラスト装置。 The shot blasting apparatus according to claim 5 or 6, wherein the control gauge constituting the abrasive grain projector is made of beryllium copper.
- 前記砥粒回収機構を構成するバケットエレベータは、導電性ナイロン製バケットを用いている請求項7記載のショットブラスト装置。 The shot blasting apparatus according to claim 7, wherein the bucket elevator constituting the abrasive grain recovery mechanism uses a conductive nylon bucket.
- 前記湿式集塵機を構成するファンインペラーは、アルミ製である請求項8記載のショットブラスト装置。 The shot blasting apparatus according to claim 8, wherein the fan impeller constituting the wet dust collector is made of aluminum.
- 当該ショットブラスト装置は、マグネシウム合金ダイカストである被処理物に砥粒を投射して、該マグネシウム合金ダイカストの表面処理をする装置であり、
前記砥粒投射機から投射される砥粒は、亜鉛系投射材である請求項1乃至請求項9の内いずれか1項に記載のショットブラスト装置。 The shot blasting apparatus is an apparatus 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 shot blasting apparatus according to any one of claims 1 to 9, wherein the abrasive grains projected from the abrasive grain projector are zinc-based projection materials. - 当該ショットブラスト装置は、アルミニウム合金ダイカストである被処理物に砥粒を投射して、該アルミニウム合金ダイカストの表面処理をする装置であり、
前記砥粒投射機から投射される砥粒は、アルミニウム系投射材である請求項1乃至請求項9の内いずれか1項に記載のショットブラスト装置。 The shot blasting device is a device for projecting abrasive grains onto an object to be processed which is an aluminum alloy die casting, and performing a surface treatment of the aluminum alloy die casting,
The shot blasting apparatus according to any one of claims 1 to 9, wherein the abrasive grains projected from the abrasive grain projector are aluminum-based projection materials.
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CN108942688A (en) * | 2018-07-17 | 2018-12-07 | 安徽理工大学 | A kind of friction stir welding surface abrasive gas Jet Polishing method of magnesium alloy |
WO2019110964A1 (en) * | 2017-12-05 | 2019-06-13 | Semblant Limited | Method and apparatus for cleaning a plasma processing apparatus |
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