JPH08361B2 - Sandblasting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is used for dirt on concrete surface, cleaning for removing previous coating for painting, surface treatment for roughening concrete surface, rust for iron products and cleaning for removing previous painting. The present invention relates to a sandblasting device.

[0002]

2. Description of the Related Art The conventional sandblasting apparatus described above is
For example, it is composed of a hopper that stores dry sand, a pump that pressurizes and supplies water in a water storage tank, and a nozzle that supplies dry sand from the hopper and that supplies water from the pump. A valve for adjusting the amount of sand supplied, for starting the supply of sand, and for stopping the supply of sand is provided between and.

When sandblasting is carried out by the sandblasting apparatus thus constructed, the valve is adjusted to adjust the amount of sand supplied to the nozzle, and the pump is operated to supply water of a predetermined pressure to the nozzle. Inside, water and sand are mixed and discharged from the nozzle. Therefore, water and sand discharged from the nozzle are sprayed on the concrete surface, for example, to stain the concrete surface, cleaning to remove the previous paint for painting, surface treatment to roughen the concrete surface, spraying on the surface of iron products. It is possible to perform sandblasting such as rust and cleaning to remove the previous paint.

[0004]

The conventional sandblasting apparatus is constructed so as to supply the sand from the hopper to the nozzle by utilizing the fluidity of the sand. Therefore, since wet sand cannot be used to secure the fluidity of sand, it is necessary to always prepare dry sand, which requires a space for storing the sand while drying it. Further, since the sand and the water are mixed by the nozzle, there is a disadvantage that the sand does not get wet and scatters out of the working range.

The present invention has been made in order to solve the above-mentioned inconvenience, and does not require management of sand, can be used even with wet sand, and does not scatter sand out of the working range. The present invention provides a sandblasting device that can be continuously used even though it is a batch system.

[0006]

SUMMARY OF THE INVENTION A sandblasting apparatus according to the present invention supplies a pressure water to a first tank which has an inlet closed and stores sand in a state where sand is precipitated in water. A first water supply pipe and an inflow port connected to the outflow port of the first tank are closed, and a second tank for accommodating sand from the first tank in a state of being precipitated in water, and a pressure for the second tank A second water supply pipe for supplying water, a third water supply pipe for supplying pressurized water to the outlet of the second tank, a compressed air supply pipe for supplying compressed air, and sand from the outlet of the second tank, Supply water and water from the third water supply pipe to the compressed air supply pipe,
It is provided with a valve for stopping the supply to the compressed air supply pipe, and a pressure resistant hose having one end connected to the connecting portion of the compressed air supply pipe and the valve and the nozzle connected to the other end.

[0007]

The sandblasting device according to the present invention has a second
While supplying pressurized water to the second tank with the water supply pipe,
When pressure water is supplied to the outlet of the second tank by the water supply pipe and the valve is opened, sand and water flow out from the outlet of the second tank and water is supplied to the outlet, so that compression is performed. When compressed air is supplied to the air supply pipe, the sand and water are sent to the nozzle in the pressure resistant hose by the compressed air and discharged.
Then, before the sand in the second tank is exhausted, pressure water is supplied to the first tank by the first water supply pipe to make the pressures of the first tank and the second tank the same, and the inlet of the second tank is opened,
Sand and water from the first tank flow into the second tank.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a sandblasting apparatus which is an embodiment of the present invention. In FIG. 1, 1 is a water supply main pipe for supplying water, 2 is a water supply pipe connecting the water supply main pipe 1 and a sprinkler nozzle 6 provided in a hopper 4 described later, and this water supply pipe 2 is of a manual type. A first valve 3 is provided.

Reference numeral 4 denotes a hopper, and 5 denotes a wire net provided in the hopper 4. The wire net 5 selects the particle size of the sand put in the hopper 4 and regulates the entry of sand and foreign matters having a certain size or more. It is a thing. Reference numeral 6 denotes a water spray nozzle provided in the hopper 4, which is for pouring sand in the hopper 4 into an inflow port 7i of a first tank 7 described later. 7 is the first
A tank is shown, and a second manual valve 8 for opening the inflow port 7i to allow the sand and water from the hopper 4 to flow in and closing the inflow port 7i to stop the inflow of the sand and water from the hopper 4 is provided. It is provided at the inlet 7i.

The inlet 9i is an outlet 7 of the first tank 7.
showing the second tank connected to o, the inlet 9i is opened to allow the sand and water from the first tank 7 to flow in, and the inlet 9i
A first electromagnetic valve 10 that closes i to stop the inflow of sand and water from the first tank 7 is provided at the inflow port 9i. Reference numeral 11 denotes a second solenoid valve connected to the outlet 9o of the second tank 9, which controls the amount of sand and water from the second tank 9 and / or the amount of water flowing out from the third water supply pipe 12C. is there.

12A, 12B, 12C and 12D are the first,
The second, third and fourth water supply pipes are shown, and the first water supply pipe 12A
Connects the main water supply pipe 1 and the first tank 7, and connects the second water supply pipe 1
2B connects the 1st water supply pipe 12A and the 2nd tank 9, and the 3rd water supply pipe 12C is the 2nd via the flow control valve 20 mentioned later.
Connect the water supply pipe 12B and the outlet 9o of the second tank 9,
The fourth water supply pipe 12D connects the water supply main pipe 1 and a compressed air supply pipe 23 described later.

Reference numeral 13 denotes a pump, which is a first water supply pipe 12A.
Is provided between the connection point with the second water supply pipe 12B and the connection point with the water supply main pipe 1. Reference numeral 14 denotes a third solenoid valve, which is provided closer to the first tank 7 than the connection point between the first water supply pipe 12A and the second water supply pipe 12B. Reference numeral 15 is a first water pressure adjusting valve provided in the first water supply pipe 12A closer to the first tank 7 than the third solenoid valve 14, and 16 is a first water pressure gauge connected to the first water pressure adjusting valve 15.

Numeral 17 is a fourth provided on the second water supply pipe 12B.
An electromagnetic valve, 18 is a second water pressure adjusting valve provided in the second water supply pipe 12B closer to the second tank 9 than the fourth electromagnetic valve 17, and 19 is a second water pressure gauge connected to the second water pressure adjusting valve 18. Show. Two
Reference numeral 0 denotes a flow rate adjusting valve provided in the second water supply pipe 12B closer to the second tank 9 than the second water pressure adjusting valve 18, and is the amount of water supplied to the second tank 9 and the amount of water supplied to the third water supply pipe 12C. To adjust.

Reference numeral 21 denotes a fifth portion provided on the fourth water supply pipe 12D .
Indicates a solenoid valve. Reference numeral 22 is a compressor, and 23 is a compressed air supply pipe. This compressed air supply pipe 23 is the compressor 2
The compressed air supplied from 2 is supplied to the outflow side of the second solenoid valve 11. Reference numeral 24 is a manual third valve provided in the compressed air supply pipe 23, 25 is a pressure adjusting valve provided in the compressed air supply pipe 23 closer to the second solenoid valve 11 than the third valve 24, and 26 is a pressure adjusting device. A pressure gauge connected to the valve 25, and 27 a sixth solenoid valve provided in the compressed air supply pipe 23 on the second solenoid valve 11 side of the pressure adjusting valve 25.

Reference numeral 28 is the second solenoid valve 11 and the compressed air supply pipe 2.
A pressure resistant hose whose one end is connected to the connection point with 3, and 29 is a nozzle connected to the other end of the pressure resistant hose 22. Reference numeral 30 denotes an operation unit having a remote control function, 31 denotes a display unit, 32 denotes a control unit, and the control unit 32 is the operation unit 30.
Each part is controlled as described later on the basis of the input from.

Next, the operation will be described. In the initial state, the first to third valves 3, 8 and 24, the first to third valves
Sixth electromagnetic valve 10, 11, 14, 17, 21 and 2
7 is closed. Also, each adjusting valve 15, 18
The pressures of 25 and 25 are set to predetermined pressures. First,
As a preparatory step, after putting a predetermined amount of sand in the hopper 4, the first
When the second valve 3, 8 and the first electromagnetic valve 10 are opened and water is sprinkled from the sprinkling nozzle 6, the sand passes through the mesh of the wire mesh 5 and flows into the first tank 7 through the inflow port 7i while getting wet. To do. Then, the sand flows into the second tank 9 through the outflow port 7o and the inflow port 9i and settles in the second tank 9.

Next, when a predetermined amount of sand is supplied into the second tank 9 and water overflows into the second tank 9, the first and second sands are filled.
The valves 3 and 8 and the first solenoid valve 10 are closed. And
After putting a certain amount of sand into the hopper 4 again, the first and second
When the valves 3 and 8 are opened and water is sprinkled from the sprinkling nozzle 6, the sand passes through the mesh of the wire mesh 5 while getting wet and the inflow port 7
Since it flows into the first tank 7 from i and precipitates in the first tank 7, for example, when water overflows from the hopper 4, the first and second valves 3 and 8 are closed.

In this state, when the start button of the operation unit 30 is operated to activate it, the control unit 32 operates the pump 13 and the compressor 22, so that the third valve 24 is opened and the compressed air of the compressor 22 is compressed. Supply pipe 2
3 to feed. At this time, the water pressurized by the pump 13 is supplied to the third and fourth solenoid valves 14 and 17.

With the preparation thus prepared, the operation unit 3
When the work button of 0 is operated to perform sandblasting, the control unit 32 opens the second, fourth, and sixth electromagnetic valves 11, 17 and 27, so that the second control valve 20 is opened in accordance with the adjustment state of the flow rate adjustment valve 20. Since the amount of water supplied to the tank 9 and the amount of water supplied to the third water supply pipe 12C are determined, the pressure in the second tank 9 is kept constant by the pressure of the second water pressure adjusting valve 18, and the pressure The sand and water flow out through the outlet 9o.

Therefore, the sand mixed water in which the proportion of sand is adjusted according to the amount of water from the third water supply pipe 12C is the second solenoid valve 1
1 is supplied to the outflow side. The proportion of sand in the sand-mixed water decreases as the amount of water from the third water supply pipe 12C increases, and increases as the amount of water from the third water supply pipe 12C decreases. Further, the sand mixed water supplied to the outflow side of the second solenoid valve 11 is compressed by the compressed air into the pressure-resistant hose 28 inside the nozzle 2.
9, the discharge state is adjusted by operating the nozzle 29, and the sand ratio is confirmed.

If the proportion of sand is small, the operating portion 3
Every time the 0 increase button is operated, the control unit 32 controls the flow rate adjusting valve 20 to reduce the amount of water supplied to the third water supply pipe 12C. Therefore, by operating the increase button of the operation unit 30, the proportion of sand Can be increased. If the proportion of sand is large, the control unit 32 controls the flow rate adjusting valve 20 to increase the amount of water supplied to the third water supply pipe 12C each time the reduction button of the operation unit 30 is operated.
By operating the weight reduction button of 0, the proportion of sand can be reduced.

In the process of sandblasting by adjusting the sand ratio of the sand-mixed water in this way, the control unit 32 calculates the sand consumption amount based on the sandblast amount (sand amount) and time, 2 Before the sand in the tank 9 is exhausted, the first and third solenoid valves 10 and 14 are opened for a predetermined period of time so that the first
The pressurized water is supplied into the tank 7, and the sand in the first tank 7 is moved to the second tank 9. Then, when the replenishment of the sand to the second tank 9 is completed, the display 31 indicates that the first tank 7 is to be replenished with the sand, and the first and third solenoid valves 10 and 14 are closed.

Therefore, after confirming the display on the display unit 31 indicating that the first tank 7 is to be refilled with sand, the hopper 4 is again filled with a predetermined amount of sand, and then the first and second valves 3 and 8 are opened. When water is sprinkled from the water sprinkling nozzle 6, the sand passes through the mesh of the wire mesh 5 while flowing into the first tank 7 through the inflow port 7i and settles in the first tank 7. Once inside the tank 7, the first and second valves 3, 8
To close. When the sand replenishment completion button of the operation unit 30 is operated, the control unit 32 causes the first tank 7 of the display unit 31 to operate.
Stop the indication to refill the sand.

Next, when the standby state button of the operation unit 30 is operated to finish the sandblasting after the sandblasting, the control unit 32 closes the second, fourth and sixth solenoid valves 11, 17 and 27. As a result, the ready state described above is achieved. When sandblasting is performed again, sandblasting can be performed by repeating the above operation.

After the sand blasting is finished, when the cleaning button of the operation unit 30 is operated to perform the cleaning for discharging the sand remaining in the pressure resistant hose 28 from the above-mentioned ready state, the control unit 32 causes the fifth operation. And the sixth solenoid valve 2
Since 1 and 27 are opened, the compressed air is supplied to the compressed air supply pipe 23, and the water is supplied from the fourth water supply pipe 12D to the compressed air supply pipe 23.
The water from D is sent to the nozzle 29 in the pressure resistant hose 28 by compressed air and discharged.

Then, the control unit 32 closes the fifth solenoid valve 21 to discharge the water in the pressure-resistant hose 28 after performing the above-described water supply and compressed air supply for a predetermined time, and then performs the sixth operation.
The electromagnetic valve 27 is closed to stop the pump 13 and the compressor 22, and the control is ended. After this,
The third valve 24 is closed. Therefore, the pressure resistant hose 2
It is possible to perform cleaning for discharging the sand remaining inside 8.

As described above, according to the embodiment of the present invention, since the sand is supplied from the second tank 9 under the pressure of water, wet sand can be used and the sand is well wetted. Therefore, even if the sand is discharged from the nozzle 29, the sand will not be scattered outside the working range. Further, since wet sand can be used, the recovered sand can be reused, which is economical. And, since there is sand in the water, the sand can be made to flow smoothly due to the fluidity of the water.

Furthermore, since the ratio of sand to water can be changed by changing the amount of water to the second tank 9 and the outlet 9o of the second tank 9, the strength and weakness of sandblasting can be continuously changed. Can be adjusted. In addition, the sand that passes through the nozzle 29 has a good fluidity due to water, and wear resistance to the nozzle 29 is reduced, so that the life of the nozzle 29 is extended. Then, since the sand can be replenished from the first tank 7 to the second tank 9 by setting the pressures of the first and second tanks 7 and 9 to be the same, it is possible to continuously perform sandblasting while being a batch type.

Although the above-mentioned first, second and third valves 3, 8 and 24 are of the manual type, these are also control section 3
The solenoid valve that can be controlled by 2 can be configured to be fully automated.

[0030]

As described above, according to the present invention, since the sand is supplied from the tank by the pressure of water, wet sand can be used and the sand is well wetted.
Even if it is discharged from the nozzle, the sand will not scatter outside the working range. Further, since wet sand can be used, the recovered sand can be reused, which is economical.

Since there is sand in the water, the sand can be made to flow smoothly due to the fluidity of the water. In addition, the sand that passes through the nozzle has a good fluidity due to water, which reduces wear resistance to the nozzle, thus prolonging the life of the nozzle. Further, since the sand can be replenished from the first tank to the second tank by setting the pressures of the first and second tanks to be the same, sand blasting can be continuously performed even though it is a batch type.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a sandblasting apparatus that is an embodiment of the present invention.

[Explanation of symbols]

 7 1st tank 7i inflow port 7o outflow port 8 2nd valve 9 2nd tank 9i inflow port 9o outflow port 10 1st solenoid valve 11 2nd solenoid valve 12A 1st water supply pipe 12B 2nd water supply pipe 12C 3rd water supply pipe 13 Pump 22 Compressor 23 Compressed air supply pipe 28 Pressure resistant hose 29 Nozzle

Claims (1)

[Claims] 1. A first tank which closes an inlet and accommodates sand in a state of being precipitated in water, a first water supply pipe for supplying pressurized water to the first tank, and a flow of the first tank. Close the inlet connected to the outlet,
A second tank for accommodating sand from the first tank in a state of being precipitated in water; a second water supply pipe for supplying pressure water to the second tank; and pressure water for supplying to an outlet of the second tank. A third water supply pipe, a compressed air supply pipe to which compressed air is supplied, and sand and water from the outlet of the second tank and water from the third water supply pipe to the compressed air supply pipe. A sandblasting device comprising: a valve for stopping the supply to the compressed air supply pipe; and a pressure resistant hose having one end connected to a connection portion between the compressed air supply pipe and the valve and a nozzle connected to the other end.