JPH05183B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a blasting device.

(Prior Art) Conventionally, a circulation type blasting device as shown in FIG. 5 has been proposed (Utility Model Application Publication No. 48-95289). This blasting device is equipped with an abrasive material injection nozzle 2 in a blast chamber 11 in a cabinet 1, and a collection circulation mechanism 3 is connected to the bottom of the blast chamber 11, and the abrasive material collected by the mechanism 3 is is supplied to the injection nozzle 2. Further, a dust collection chamber 64 equipped with a filter 63 is connected to the back of the blast chamber 11 via a filter 40, and an exhaust device 7 is provided at the outlet of the dust collection chamber to exhaust the filtrated air. It is discharged from the port 71 to the outside.

In the above-mentioned blasting device, the abrasive material is stopped by the filter 40, falls into the recovery circulation mechanism 3, and is re-supplied to the injection nozzle 2. In addition, fine abrasive material crushed by colliding with the object to be polished and rust scraped off from the object to be polished (hereinafter referred to as dust) pass through the filter 40 and then into the dust collection chamber 6.
4 and will be collected and disposed of.

(Problem to be solved) However, with the advancement of metal surface treatment technology in recent years, fine abrasive materials are sometimes used, and under these circumstances, the blasting equipment shown in Figure 5 The following problems arose.

That is, conventionally, the abrasive material was relatively coarse, but by equipping the filter 40 with an appropriate fineness, it is possible to almost completely separate the reusable abrasive material from dust, and the abrasive material can be removed. I was able to reuse it.

However, due to the miniaturization of abrasive materials, the fine abrasive materials flow together with the airflow, easily pass through the filter 40, and reach the dust collection chamber 64. Dust collection chamber 64
In this case, the abrasive material remained on the surface of the filter 63 together with the dust, fell into a hopper provided below the dust collection chamber, and was disposed of together with the dust. Therefore, the consumption of expensive abrasive materials is significant, resulting in high costs.

To solve this problem, it is possible to make the filter 40 finer, but since such a filter gets clogged after being used for a short time, the filter must be replaced frequently, making continuous operation impossible. I had a problem that didn't exist.

An object of the present invention is to provide a blasting device that can increase the reuse rate of abrasive materials even when using fine abrasive materials, and does not require frequent filter replacement as in the past. It is.

(Means for Solving the Problem) In order to achieve the above object, the applicant has tried various modifications to the blasting device, and as a result, the applicant has developed a new screen support for the screen device for separating the abrasive material and dust. The present invention was successfully completed by adopting this structure and successfully separating the dust deposited on the surface of the screen by inverting the screen.

That is, in a general filter structure, the filter is fixed in a chamber, and the flow of exhaust gas through the filter is only one direction, and the exhaust gas does not flow backwards. However, in the present invention, Instead of a fixed filter, the blast chamber was equipped with a reversible screen so that the exhaust flow before and after reversal was in the opposite direction to the screen.

In the circulating blasting apparatus according to the present invention, a reversible screen 41 is provided in the blast chamber 11 to allow the passage of dust in the chamber and prevent the passage of abrasive materials, and the screen 41 is provided with a reversing mechanism. 5
It is connected to. Further, an exhaust path formed at the rear of the screen 11 is connected to the dust collector 6.

(Function) The abrasive material injected into the blasting chamber 11 does not pass through the screen 41 and is transferred to the recovery circulation mechanism 3.
It is supplied to the injection nozzle 2 through the. On the other hand, the dust in the blast chamber 11 passes through the screen 41 and is collected by the dust collector 6.

Dust adheres and accumulates on the upper surface of the screen 41,
When a situation arises that poses a problem to overaction, the reversing mechanism 5 is operated to reverse the screen 41. As a result, the surface to which dust has adhered is reversed from the blast chamber 11 side to the dust collector side 6. Therefore, the exhaust flow passing through the screen 41 separates the dust from the filter surface and sends it to a dust collector for collection.

(Effects of the Invention) According to the blasting device according to the present invention, even when the screen 41 is equipped with a fine mesh to match the fine abrasive material, the mesh of the screen 41 can be adjusted by reversing the screen 41 at the appropriate time. Clogging can be prevented in advance. Therefore, there is no need for frequent filter replacement as in the past, and a high abrasive material utilization rate can be achieved.

(Embodiment) FIGS. 1 to 4 show an embodiment of a circulating blasting apparatus according to the present invention.

The examples are for illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing its scope.

As shown in FIG. 1, the front of the work cabinet 1 is provided with a viewing window 12 for observing the cleaning state and a pair of work cuffs 13 for inserting both hands into the blasting chamber 11. There is.

An exhaust passage 15 is formed at the back of the work cabinet 1 with a partition wall in between, and a dust collector 6 is further provided at the back of the exhaust passage 15.

In the blasting chamber 11, the injection nozzle 2 is supported by a height-adjustable support member 21, and at the bottom of the blasting chamber 11, a table 14 is installed on which an object to be polished is placed. The table 14 is provided with holes of appropriate size in a grid pattern so as to allow the abrasive material to pass through, but to catch relatively large flakes generated by the abrasive cleaning.

A recovery circulation mechanism 3 is connected below the table 14. The mechanism 3 connects a blast tank 32 to the lower end of a chute 31 as shown in FIG.
An air supply main pipe 9 connected to an air compressor (not shown) is connected to the upper part of the blast tank 32, and the abrasive material in the tank is lowered in pressure by pressurized air.

Further, an abrasive discharge port provided at the lower end of the blast tank 32 and a pressure air pipe 91 branched from the air supply main pipe 9 are connected to each other by a mixing valve 33, and a An abrasive supply hose 22 is connected. The supply hose 22 is connected to the injection nozzle 2 of the blast chamber 11 .

Therefore, from the blast tank 32 to the mixing valve 3
The abrasive material supplied to the spray nozzle 3 is mixed with pressurized air at the mixing valve 33, and is force-fed to the injection nozzle 2 via the supply hose 22.

The recovery circulation mechanism 3 is also equipped with a control mechanism 81 for controlling the supply of abrasive material to the injection nozzle 2, and by depressing a foot pedal 8 provided on the control mechanism, the abrasive material and It is possible to set an ON state in which a mixed flow with pressurized air is supplied to the injection nozzle, a STOP state in which only pressure air is supplied, and an OFF state in which the supply of both the abrasive material and pressurized air is stopped.

As shown in FIGS. 1 to 4, the blast chamber 11
A screen device 4 is disposed above the screen. The screen device 4 includes a flat rectangular overscreen 41 at a lower opening of a rectangular parallelepiped housing 42.
A shaft 52 fixed to the center of the screen 41 is rotatably installed on the cabinet wall. Therefore, the screen 41 can be turned around the shaft 52 by 180 degrees. Further, band-shaped rubber seal members 45, 45 that can come into contact with the tip of the screen 41 are attached to the opening edge of the housing 42. Note that the screen 41 is made of fine mesh so that only air and fine dust can pass therethrough, and abrasive material having a particle size that can be reused is blocked from passing through.

One end of the shaft 52 is connected to an air motor 51 provided on the side of the work cabinet 1 as shown in FIG. 3, and the screen 41 can be reversed by driving and controlling the air motor. The control circuit of the air motor 51 uses a timer to periodically issue a reversal command, or detects the differential pressure between the over chamber 43 and the blast chamber 11, and issues a reversal command when the differential pressure exceeds a predetermined value. It is configured to emit.

An exhaust duct 44 is connected to the upper part of the housing 42 .

A dust collector 6 having a bag filter 61 and a hopper 62 is provided at the back of the work cabinet 1, and the lower opening of the exhaust passage 15 communicates with the inlet of the bag filter 61.

Furthermore, an exhaust device 7 is disposed above the dust collector 6 to exhaust air that has passed through the bag filter 61 to the outside through an exhaust port 71.

By the operation of the exhaust device 7, the exhaust gas from the blast chamber 11 is guided to the dust collector 6 through the screen device 4, the exhaust duct 44, and the exhaust path 15. At this time, the screen device 4 is attached to the ceiling wall of the blast chamber 11 in the direction opposite to the direction in which the abrasive is injected, and the opening of the housing 42 is connected to the exhaust duct 4.
4, and the flow velocity of the exhaust gas sucked into the housing is set relatively low, so that only the dust floating in the blasting chamber is guided towards the screen device 4, and the reusable polishing Most of the scavenging material falls into the chute 31 below.

When some of the reusable fine abrasive materials in the blast chamber 11 get on the exhaust flow toward the screen device 4, these abrasive materials are bounced off the screen 41 and are collected by the recovery circulation mechanism 3. It will be collected.

In addition, the exhaust gas containing dust that has passed through the screen 41 increases its speed in the exhaust duct 44 and flows through the exhaust path 15.
After flowing downward, the direction of flow is reversed upward and heads toward the dust collector 6. During the change of direction, heavy dust falls into the hopper 62. Although light dust rises along with the exhaust flow, it is stopped by the bag filter 61, and only the air that has passed through the bag filter 61 is discharged to the outside.

In the above-mentioned blasting device, the reuse rate of the abrasive material is high as mentioned above, and since the screen 41 is automatically reversed and clogging of the screen 41 is prevented, there is no need to replace the screen. , can be operated continuously for a long period of time.

The drawings and the description of the above embodiments are for illustrating the present invention, and should not be construed to limit or reduce the scope of the invention described in the claims.

Further, the configuration of each part of the present invention is not limited to the above embodiments,
Of course, various modifications are possible within the technical scope of the claims.

For example, the abrasive collection and circulation mechanism 3 includes not only a system in which the abrasive material in the blast tank 32 is pumped to the mixing valve 33 using air pressure, but also a suction system in which an ejector is provided in place of the mixing valve 33. Recruitment is possible.

Further, the screen device 4 is connected to the work cabinet 1.
It is also possible to install it detachably.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a main part of the blasting device according to the present invention broken away, FIG. 2 is an enlarged sectional view of the screen device, FIG. 3 is a front view of the blasting device shown in FIG. 1, and FIG. 4 5 is a partially cutaway side view of the blasting device, and FIG. 5 is a sectional view of the conventional device. 1...Work cabinet, 11...Blast chamber, 2...Injection nozzle, 3...Recovery circulation mechanism, 4
...Screen device, 41...Screen, 6...
...Dust collector, 71...Exhaust port.

Claims (1)

[Claims] 1 Blast chamber 1 provided in work cabinet 1
1 is equipped with an abrasive material injection nozzle 2 and is connected to an abrasive material recovery circulation mechanism 3, and the abrasive material collected by the mechanism 3 is force-fed to the injection nozzle 2, and the abrasive material is discharged from the blast chamber 11. is sent to the dust collector 6 In the circulation type blasting device, the blasting chamber 11 includes:
A screen 41 that allows indoor dust to pass through and blocks the abrasive material from passing through is reversibly provided, and the screen 41 is connected to the reversing mechanism 5, and the exhaust path formed at the rear of the screen 11 serves as a dust collector. 6, and is characterized in that by reversing the screen 41 at appropriate times, dust adhering to the screen is separated by an exhaust flow.