JPH0435873A - Blasting device - Google Patents

Abstract

PURPOSE:To prevent the feeding route of abrasives from wearing by providing a blasting means of abrasives together with pressurizing gas to the work surface with the back pressure caused by the flow of the pressurizing gas, at the ends of the work side of abrasives feeding pass and pressurizing gas feeding pass. CONSTITUTION:Abrasives 12 are fed to a blasting means 28 via an abrasives feeding pass 22 and also a pressurizing gas A is fed to the blasting means 28 via a pressurizing gas feeding pass 41. The abrasives 12 are blasted to a work W with its suction by the negative pressure caused at the time when this pressurizing gas A is blasted with its direction for the work W and the polishing of the work W surface is performed by those.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a blasting device that polishes the surface of a workpiece by injecting an abrasive material together with pressurized gas onto the surface of the workpiece.

[Prior Art] For example, the present applicant has proposed a method of blasting in which particles such as sand are injected together with pressurized gas onto the surface of the molded product in order to remove the mold release agent adhering to the surface of the molded product taken out from the mold. It is proposed that the mold release agent be removed using a device.

In this blasting device, an abrasive material made of particles such as sand is normally injected onto the surface of the molded body from an injection nozzle together with pressurized gas through a supply pipe.

Further, when the polishing work is completed, the abrasive material attached to the molded body surface is removed by injecting only pressurized gas onto the surface of the molded body.

[Problems to be Solved by the Invention] Incidentally, since the abrasive material is forced to be fed through the supply pipe by pressurized gas, it causes wear and tear on the supply pipe.

Moreover, the spray nozzle and other parts connected to the supply pipe are also worn out by the abrasive material, which inconveniently reduces the functionality of the blasting device.

Therefore, in order to prevent wear and tear on the supply pipes, etc., it is conceivable to use reinforced materials, but this cannot be said to be an essential solution.

On the other hand, a blasting device that can switch between polishing work and abrasive removal work requires a supply pipe, an injection nozzle, etc. for guiding the pressurized gas to the surface of the molded article, and this has the disadvantage of complicating the configuration.

The present invention has been made in view of the above problems, and includes:
A first object of the present invention is to provide a blasting device that can prevent wear and tear on an abrasive supply path.

Furthermore, the present invention can effectively supply pressurized gas to the work surface, and can switch between the abrasive and pressurized gas injection operation and the pressurized gas only injection operation using an extremely simple mechanism. The second object is to provide a blasting device that can perform the following steps.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an abrasive supply path for supplying an abrasive to the workpiece side for polishing the surface of the workpiece, and a pressurized gas to the workpiece side. a pressurized gas supply path, and a pressurized gas supply path provided at the end of the workpiece side of the abrasive material supply path and the pressurized gas supply path, and pressurizes the abrasive material by back pressure generated by the flow of the pressurized gas. The present invention is characterized by comprising: an injection means for injecting the gas together with the workpiece surface.

Further, the present invention is characterized in that the abrasive supply path is provided with an atmosphere opening means that is selectively opened to the atmosphere.

[Operation] In the blasting device according to the present invention, the abrasive is supplied to the injection means via the abrasive supply path, and pressurized gas is supplied to the injection means via the pressurized gas supply path, so that the pressurized The abrasive material is sucked by the negative pressure generated when the gas is injected toward the workpiece and is injected onto the workpiece, thereby polishing the surface of the workpiece.

Further, in the blasting apparatus according to the present invention, the abrasive supply path is opened to the atmosphere by operating the atmosphere release means, and the pressurized gas is injected toward the workpiece via the pressurized gas supply path. Atmospheric air is also sucked from the abrasive material supply path by the negative pressure generated at the time and is injected onto the workpiece, and the abrasive material on the surface of the workpiece is removed by this pressurized gas.

Embodiment FIG. 1 is an overall configuration diagram showing an embodiment of a blasting apparatus according to the present invention. This blasting device 10 includes an abrasive supply section 14 that supplies an abrasive 12 such as sand, and an abrasive 12 such as sand.
2 onto the workpiece W.

The abrasive supply unit 14 includes an abrasive holding tank 18 that holds the abrasive 12 and an abrasive recovery tank 20 that collects the abrasive 12 from the work W side, and these are integrally constructed. An abrasive supply pipe 22 for supplying the abrasive 12 to the plastic part 16 is connected to the abrasive holding tank 18 . Further, an abrasive recovery pipe 24 for recovering the abrasive 12 from the plastic part 16 side is connected to the abrasive recovery tank 20 .

The blast section 16 has a blast chamber 30 surrounded by a casing 26 and in which a spray nozzle 28 is disposed, and a workpiece W held by a holder 32 is placed above the blast chamber 30 . The abrasive recovery pipe 24 is connected to the lower part of the blasting chamber 30, and the abrasive recovery tank 20 in the abrasive supply section 14 is connected via the abrasive recovery pipe 24. Furthermore, a nozzle drive section 34 for displacing or supplementary movement of the injection nozzle 28 is arranged on the side of the casing 26 .

The nozzle drive unit 34 includes a connecting pipe 3 through which compressed air A flows.
6 is provided at one end. The other end of the connecting pipe 36 enters the blast chamber 30 via the casing 26, and a plurality of injection nozzles 28 are arranged at predetermined positions in the blast chamber 30 so as to face the workpiece W. In this case, the connecting pipe 36 can be supplemented and displaced in the direction of the arrow by motors 38 and 40 provided in the nozzle drive section 34. Compressed air A is supplied to the connecting pipe 36 from the compressed air supply pipe 41 via the stop valve 37 and the switching valve 39.

Here, the detailed configuration of the injection nozzle 28 and its surroundings is shown in FIG. That is, the injection nozzle 2B is connected to a compressed air introduction pipe 42 connected to the connecting pipe 36 and an abrasive material supply pipe 44, and also connected to the compressed air introduction pipe 4.
2, a mixing section 48 that mixes the compressed air from the compressed air introduction pipe 42 and the abrasive material 12 from the abrasive material supply pipe 44, and a nozzle 50 attached to the mixer 848.

On the other hand, the abrasive holding tank 18 in the abrasive supply section 14
The abrasive supply pipe 22 connected to the blast chamber 30 and the abrasive supply pipe 44 connected to the injection nozzle 28 in the blast chamber 30 are configured to be connectable or separable by an atmosphere opening mechanism 52.

That is, the atmosphere release mechanism 52 includes brackets 54 and 56 that hold each end of the abrasive supply pipes 22 and 44, and cylinders 58 and 60 for joining the bracket 54 to the bracket 56 or separating them from each other. In this case, compressed air A is supplied to each cylinder 58, 60 via a switching valve 62.

The blasting device 10 according to this embodiment is basically configured as described above, and its operation will be explained next.

First, the case where the surface of the workpiece W is polished will be explained.

The operator opens the stop valve 37 to supply compressed air A to the compressed air supply pipe 41. In this case, compressed air A drives the cylinders 58, 60 through the switching valve 62 and connects the abrasive supply pipes 22 and 44 by joining the brackets 54 and 56.

Further, the compressed air A is supplied from the compressed air supply pipe 41 to the switching valve 3.
After being supplied to the connecting pipe 36 via the injection nozzle 28
The compressed air is introduced from the compressed air introduction pipe 42 into the mixing section 48 and is injected toward the workpiece W from the nozzle 50.

On the other hand, the abrasive holding tank 18 in the abrasive supply section 14
The abrasive material 12 held in the abrasive material 12 is introduced into the mixing section 48 in the injection nozzle 28 via the abrasive material supply pipe 22 and the abrasive material supply pipe 44 connected by the atmosphere opening mechanism 52. In this case, a negative pressure is generated in the mixing section 48 by the compressed air A injected from the compressed air introduction pipe 42. Therefore, the abrasive material 12 is sucked by the negative pressure, and is injected toward the workpiece W from the nozzle 50 together with compressed air.

In this way, the abrasive material 12 mixed with the compressed air A is injected onto the work W to polish the surface or remove the mold release agent. Incidentally, since the injection nozzle 28 is swung and translated by the motors 38 and 40 in the nozzle drive unit 34, operations such as polishing can be effectively performed.

Here, the abrasive material 12 passes through the abrasive material supply pipes 22 and 44 at a low speed, and then is accelerated in the mixing section 48 of the injection nozzle 28 by the negative pressure generated by the compressed air A and is injected onto the workpiece W. Therefore, the passage of the abrasive material 12 from the abrasive material holding tank 18 to the injection nozzle 28 will not be worn out by the abrasive material 12, resulting in decreased functionality or damage, and the life of the blasting device 10 can be extended. can get.

Next, the operation of removing the abrasive material 12 attached to the surface of the workpiece W will be explained.

First, after stopping the supply of the abrasive material 12 from the abrasive material holding tank 18, the switching valve 62 is switched, and the cylinders 58 and 60 are driven to close the bracket 5 of the atmosphere opening mechanism 52.
4.56 apart. Next, compressed air is supplied to the injection nozzle 28 from the compressed air supply pipe 41 via the switching valve 39 . Compressed air A is supplied to the nozzle 5 as in the case described above.
It is injected from zero toward the workpiece W.

On the other hand, the negative pressure generated in the mixing section 48 by the compressed air A sucks the abrasive material 12 remaining in the abrasive material supply pipe 44 and injects it toward the workpiece W, and then the atmospheric release mechanism 52
Atmospheric air is sucked in through the opening of the brackets 54 and 56, and is injected toward the workpiece W together with compressed air.

In this way, the mold release agent and the like adhering to the surface of the workpiece W are removed. In this case, the workpiece W is supplied not only with the compressed air A but also with the atmosphere from the atmosphere release mechanism 52, so that extremely efficient removal work is performed due to the synergistic effect.

Moreover, since the injection nozzle 28 is used not only for the polishing operation described above, but also for the removal operation of the abrasive material 12, the overall configuration of the blasting device 10 is simplified.

[Effects of the Invention] As described above, according to the present invention, the abrasive is supplied to the injection means through the abrasive supply path, and the pressurized gas is supplied to the injection means through the pressurized gas supply path. The abrasive material is sucked by the negative pressure generated when the pressurized gas is injected toward the workpiece and is injected onto the workpiece, thereby polishing the surface of the workpiece.

In this case, since the abrasive is accelerated in the injection means and not in the preceding stage, the abrasive supply path is not worn out by the flow of the abrasive, and therefore the durability of the apparatus is improved.

Further, in the present invention, the abrasive supply path is opened to the atmosphere by operating the atmosphere release means, and the negative pressure generated when pressurized gas is injected toward the workpiece via the pressurized gas supply path. The atmosphere is sucked in from the abrasive material supply path and injected onto the workpiece, and the abrasive material on the surface of the workpiece is removed by this gas.

In this case, the removal operation of the abrasive material is performed extremely efficiently. Further, since the spraying means is used for both the polishing operation and the abrasive removal operation, and the atmosphere opening means can switch between these operations, the overall structure of the apparatus can be simplified.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a blasting device according to the present invention, and FIG. 2 is a cross-sectional diagram showing an embodiment of an injection means in the blasting device of FIG. ... Blasting device ... Abrasive material ... Abrasive material supply section ... Plast section ... Abrasive material holding tank 20 ... Abrasive material recovery tank 22.44 ... Abrasive material supply pipe 24 ... - Abrasive material recovery pipe 28...Injection nozzle 30...Blast chamber 34...Nozzle drive section 39.62...Switching valve 42...Compressed air introduction pipe 48...Mixing section 52... Atmospheric release mechanism

Claims (2)

[Claims] (1) An abrasive supply path that supplies an abrasive to the workpiece for polishing the surface of the workpiece; a pressurized gas supply path that supplies pressurized gas to the workpiece; the abrasive supply path and the pressurized gas a blasting means disposed at the end of the supply path on the workpiece side, and for injecting the abrasive material together with the pressurized gas onto the surface of the workpiece by a back pressure generated by the flow of the pressurized gas. Device. (2) The blasting apparatus according to claim 1, wherein the abrasive supply path is provided with an atmosphere opening means that is selectively opened to the atmosphere.