JPS6351827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that reliably opens and closes an abrasive recovery valve of a blasting device.

In the blasting device, a recovery tank 3 is arranged above a blast tank 1, and the polished abrasive material is stored in the recovery tank 3. The blast tank 1 is connected to the communication port 10 between the recovery tank 3 and the blast tank 1.
A recovery valve is provided with an umbrella-shaped valve body 4 arranged vertically movably on the side, and the valve body 4 is connected to the communication port 10 by the pressure difference between the negative pressure of the recovery tank 3 and the high pressure of the blast tank 1.
is in pressure contact with the valve seat. In addition, the release valve 11 is opened at a suitable time to return atmospheric pressure to the blast tank 1, and the decrease in pressure difference between the blast tank 1 and the recovery tank 3 and the weight of the abrasive material in the recovery tank 3 cause the valve body 4 to be removed from the valve seat. The abrasive material in the recovery tank 3 is transferred to the blast tank 1.

In order to collect the abrasive material into the collection tank 3, the tank is equipped with an intake port 30 that communicates with the intake device 2 to maintain negative pressure in the tank, and the base end of the collection hose is connected tangentially to the wall of the collection section of the tank. The abrasive material is sucked in through the collection hose, and the suction airflow that flows tangentially into the collection tank is circulated through the collection section of the tank, separating the abrasive material and sending it into the suction cylinder 32.
The abrasive material rises inside and is discharged from the intake port 30, and only the abrasive material remains in the collection tank 3 and is stored there.

However, since the recovery tank 3 is always in communication with the intake device through the intake port 30 and maintained at negative pressure, the release valve 11 is used to transfer the recovered abrasive material to the blast tank 1.
Even if you open the tank, if the pressure difference between tanks 1 and 3 is greater than the weight of the abrasive material in the recovery tank,
The valve body 4 remained pressed against the valve seat of the communication port 10 and did not come off, making it difficult to transfer the abrasive material.

The reason why it is impossible to transfer the abrasive material stored in the recovery tank to the blast tank is because there is a large pressure difference between the two tanks, and the pressure that presses the valve body against the valve seat overcomes the weight of the abrasive material. It is.

In the present invention, when transferring the abrasive material, the collection tank 3
By temporarily blocking the intake port 30 to the intake device, the pressure in the recovery tank 3 is raised to atmospheric pressure through the recovery hose, thereby eliminating the pressure difference between the two tanks 1 and 3.

The present invention provides an intake port 30 through which the recovery tank 3 communicates with the intake device 2 with a regulation valve 5 that normally leaves the intake port 30 open, and an actuation device 6 that forcibly brings the regulation valve 5 into pressure contact with the intake port 30. It is characterized by what it did.

By keeping the regulation valve 5 apart from the intake port 30 at all times, the recovery tank is communicated with the intake device 2 and maintained at negative pressure, and the abrasive material is recovered.

When transferring the abrasive material, the inside of the recovery tank 3 is temporarily cut off from the air intake device 2 by operating the regulation valve 5 and blocking the intake port 30, and the inside of the recovery tank becomes atmospheric pressure through the recovery hose. The pressure difference between the two tanks disappears, and the valve body 4 can be dropped from the valve seat by the weight of the abrasive material.

According to the present invention, the abrasive material can be reliably transferred to the blast tank by separating the valve body 4 from the communication port 10.

1 to 3b show one embodiment of the present invention, in which the recovery tank 3 and the blast tank 1 are the same as those of a conventional sandblasting device.

An intake port 30 through which the recovery tank 3 communicates with the intake device 2
The present invention is characterized in that a regulating valve 5 and an actuating device 6 are provided in the control valve 5 and the actuating device 6.

A regulating valve 5 is disposed in an intake chamber 20 communicating with the intake device 2 so as to be movable up and down with respect to an intake port 30 opening in the upper wall 34 of the abrasive material separation section 33 of the recovery tank 3,
A bracket 35 is provided on the upper part of the intake pipe 32 hanging down from the upper wall 34, and a spring 60 is interposed between the regulation valve 5 and the bracket 35, so that the regulation valve 5 is always connected to the intake port 3.
The recovery tank is communicated with the intake device 2 by being pushed up from a valve seat 36 protruding from the surrounding area. Intake port 2
0, a cylinder 62 is installed opposite to the intake port 30, a piston 61 that slidably fits into the cylinder 62 is provided on the upper surface of the regulating valve 5, and a compressed air supply port is provided on the end surface of the cylinder 62. 64 is connected to constitute an actuating device 6 for the regulating valve 5.

However, during the blasting operation, the regulating valve 5 is pushed up by the spring 60 and separated from the intake port 30 as shown in FIG. The abrasive material flowing out from the outflow valve 12 at the bottom of the tank is mixed with the air flow communicating with the pressure air pipe 13, and becomes a blast air flow to be sent to a blast nozzle (not shown).
I'm making it gush more.

In addition, since the abrasive material that has been sprayed and abrasive from the object to be processed is deposited on the floor of the processing area, it flows into the separation section 33 of the recovery tank 3 through a recovery hose (not shown) and is removed from the air. The air flow is separated from the intake cylinder 3.
2. The abrasive material is discharged to the outside through the intake port 30 and stored in a recovery tank.

To transfer the abrasive material to the blast tank 1, open the release valve 11, return the inside of the blast tank to atmospheric pressure, and force compressed air into the cylinder 62 from the air supply port 64 of the actuating device 6 to move the piston 61. It is pushed down against the spring 60 to press the regulating valve 5 into contact with the valve seat 36, temporarily shutting off the recovery tank 3 from the intake device 2 (Fig. 3b).

Therefore, the recovery tank 3 becomes atmospheric pressure through the recovery hose, and the pressure difference with the blast tank 1 disappears, so the valve body 4 that was blocking the communication port 10 moves away from the communication port 10 due to the weight of the abrasive material, and the abrasive This allows the cleaning material to flow into the blast tank 1.

After the abrasive material has been transferred, the release valve 11 is closed, and compressed air is blown out from the air pipe 14 to blow the valve body 4 up to the communication port 10 and press the valve body 4, increasing the pressure in the blast tank 1. At the same time, the actuating device 6 air outlet 6
4 is switched to the atmosphere, the regulating valve 5 is pushed up by the spring 60 to return to its original state, and the blasting work can be started again.

FIGS. 4a and 4b are cross-sectional views showing other embodiments of the present invention. A stretchable membrane valve body 65 made of rubber or synthetic resin is disposed on the upper wall 21 of the intake chamber 20, facing the intake port 30 to the intake device. The operating device 6 is configured such that the peripheral edge is airtightly fixed to the upper wall 21 and a compressed air inlet 64 is provided between the upper surface of the valve body 65 and the upper wall 21.

Normally, the valve body 65 is separated from the intake port 30 by its own elastic force, as shown in FIG. 4a.

When transferring the abrasive material, compressed air is ejected from the air supply port 64 to expand the valve body 65 and bring it into close contact with the periphery of the intake port 30, thereby temporarily blocking the recovery tank 3 from the air intake device 2. Therefore, the abrasive material can be transferred to the blast tank 1 as described above (Fig. 4b).

The supply of compressed air to the air supply port 64 is stopped, and the upper wall 2
When the airtight space between the valve body 1 and the valve body 65 is returned to atmospheric pressure, the valve body 65 returns to its original shape, and the blasting operation and collection of the abrasive material are performed again.

Further, the actuating device 6 is not limited to the injection of compressed air, and may include a solenoid valve, a liquid cylinder, etc.
Of course, the intake port 30 can be closed by electrically or mechanically operating the regulating valve 5 by connecting to the regulator.

[Brief explanation of drawings]

Figure 1 is a front view of the entire blasting device, Figure 2 is a sectional view taken along the line - in Figure 1, Figure 3a, Figure 3.
FIG. b is an enlarged sectional view of a regulating valve and an actuating device according to the present invention, and FIGS. 4a and 4b are enlarged sectional views of a regulating valve and an actuating device according to other embodiments of the present invention. 1...Blast tank, 10...Communication port, 2...
... Intake device, 3 ... Recovery tank, 30 ... Intake port, 33 ... Separation section, 4 ... Valve body, 5 ... Regulation valve, 6 ... Actuation device.

Claims (1)

[Claims] 1. A recovery tank 3 communicating with an intake device 2 and equipped with a recovery hose is disposed above the blast tank 1 connected to an exhaust valve 11, and a communication port 10 between the recovery tank 3 and the blast tank 1 is arranged. When the valve body 4 of the recovery valve is disposed on the blast tank 1 side so as to be movable up and down, the tip of the pressure air pipe 14 is communicated with the inside of the blast tank 1 by penetrating the wall surface of the blast tank 1, and the communication port 10 is opened. In the blasting device which opens the release valve 11 to communicate the blast tank 1 with the atmosphere, the recovery tank 3 is connected to the intake port 30 which communicates with the intake device 2. An opening/closing device for an abrasive material recovery valve of a blasting device, characterized in that an actuating device 6 is provided for forcibly bringing a valve 5 into pressure contact with an intake port 30. 2. The regulation valve 5 is connected to a spring 60 that urges the intake port 30 away from the intake port 30 to keep the intake port 30 open at all times. 2. The device according to claim 1, wherein the actuating device 6 is constituted by a cylinder 62 in which a piston shaft mounted on a wall is slidably fitted, and a compressed air supply pipe 63 connected to the cylinder 62. 3. The regulation valve 5 is a stretchable elastic valve plate that is stretched apart from the intake port 30 and whose peripheral edge is fixed to the recovery tank wall, and the air supply pipe 63 is connected to the recovery tank wall opposite to the back surface of the elastic valve plate. Apparatus according to claim 1 connected thereto.