Air control system for pneumatic screw pump thin spraying machine

Abstract

The present invention provides an air control system for a pneumatic screw pump thin-spray coating machine, which can realize the forward start of a bidirectional air motor and the forward and reverse rotation and delayed stop when the machine is shut down, release the residual material pressure in the feed pipe, and reduce the waste of spray material. Its main circuit includes a switch valve, a switching valve, and a bidirectional air motor connected in sequence; the control circuit includes a three-position five-way valve, a manual valve 1, a manual valve 2, a manual valve 3, a shuttle valve 1, and a shuttle valve 2. The three-position five-way valve is connected to an air source, the input port of the manual valve 1 is connected to the output port 1 of the three-position five-way valve, the input port of the manual valve 2 and the input port of the manual valve 3 are connected to the output port 2 of the three-position five-way valve, the input port 1 and the input port 2 of the shuttle valve 1 are connected to the output port of the manual valve 1 and the output port of the manual valve 2 respectively, the input port 1 of the shuttle valve 2 is connected to the output port of the manual valve 3, and the input port 2 of the shuttle valve 2 is connected to the output port of the manual valve 1 through a one-way throttling speed regulating valve; the output port of the shuttle valve 1 is connected to the control port of the switching valve, and the output port of the shuttle valve 2 is connected to the control port of the switch valve.

Description

Technical Field

[0001] This patent relates to an air control system for driving a screw pump thin-spray coating machine, which is particularly suitable for driving and controlling a coal mine screw pump thin-spray coating machine for spraying operations, and belongs to the field of coal mine spraying technology. Background Art

[0002] With the development of coal mine thin-spraying technology, the application of tunnel thin-spraying sealing technology has gradually improved, but the thin-spraying wet construction equipment in the mine can no longer meet the needs of mine production. The screw pump sprayer is widely used in the engineering field due to its advantages of conveying high viscosity, particle-containing spraying materials, uniform flow and no pulse. According to research and analysis, the screw pump sprayer is more suitable for thin-spraying material construction.

[0003] The screw pump sprayer adopts electric drive system in the field of engineering application. Coal mines have strict explosion-proof requirements for electric drive systems. The engineering screw pump electric drive system cannot be used in coal mines. The design of coal mine explosion-proof electric drive system is costly, large in size and weight, and low in safety, which is not conducive to on-site application. The air source is a widely used and safe power source in coal mines, so providing a set of coal mine pneumatic screw pump thin spray machine air control system is an urgent problem that technicians in this field need to solve. Summary of the invention

[0004] The purpose of this patent is to provide an air control system for a pneumatic screw pump thin-spray sprayer, which is particularly suitable for underground operations such as coal mines. It has two control modes with interlocking functions, namely "manual near control" for debugging and repairing the sprayer and "manual remote control" for normal long-distance spraying operations of the sprayer. The "manual near control" can realize the independent start, stop, forward and reverse functions of the bidirectional air motor; the "manual remote control" can realize the forward start of the bidirectional air motor and the forward and reverse rotation when shutting down and delay the stop, release the residual material pressure in the feed pipe, reduce the waste of spray material and improve the spraying quality; the main circuit can adjust the spray flow rate; in the "manual remote control" mode, when shutting down forward and reverse, the reversal duration can be adjusted; it can completely replace the function of the electric drive system, and can effectively solve the problems of high cost, large size and weight, and low safety of underground electric drive systems in coal mines and other places.

[0005] To solve the above technical problems, this patent provides the following technical solutions:

[0006] The air control system of the pneumatic screw pump thin-spray spraying machine includes an air source, a main circuit and a control circuit connected to the air source; the main circuit includes a switch valve, a switching valve, and a bidirectional air motor, the switch valve is connected to the air source, the switching valve input port is connected to the switch valve output port, and the two output ports of the switching valve are respectively connected to the two input ports of the bidirectional air motor;

[0007] The control circuit includes a three-position five-way valve, a manual valve 1, a manual valve 2, a manual valve 3, a shuttle valve 1, and a shuttle valve 2. The three-position five-way valve input port is connected to an air source, the manual valve 1 input port is connected to the three-position five-way valve output port 1, the manual valve 2 input port and the manual valve 3 input port are connected to the three-position five-way valve output port 2, the shuttle valve 1 input port 1 and the shuttle valve 1 input port 2 are respectively connected to the manual valve 1 output port and the manual valve 2 output port, the shuttle valve 2 input port 1 is connected to the manual valve 3 output port, and the shuttle valve 2 input port 2 is connected to the manual valve 1 output port through a one-way throttling speed regulating valve.

[0008] The switch valve and the switching valve are pressure-controlled reversing valves; the output port of the shuttle valve 1 is connected to the control port of the switching valve, and the output port of the shuttle valve 2 is connected to the control port of the switch valve;

[0009] The above-mentioned further improvement on the air control system of the pneumatic screw pump thin-spray spraying machine is that the control circuit also includes an auxiliary gas tank, and the input port of the auxiliary gas tank is connected to the second input port of the shuttle valve.

[0010] The above further improves the air control system of the pneumatic screw pump thin-spray sprayer, in which the air source is connected to the switch valve in the main circuit and the input port of the three-position five-way valve in the control circuit through the two output ports of the T-type three-way ball valve.

[0011] The above-mentioned further improvement on the air control system of the pneumatic screw pump thin-spray sprayer is that the air source is connected to the switch valve through an output port of the T-type three-way ball valve through a main circuit air source processor for filtering and removing water from the compressed gas entering the main circuit; the air source is connected to the input port of the three-position five-way valve through another output port of the T-type three-way ball valve through a control circuit air source processor for filtering and removing water from the compressed gas entering the control circuit;

[0012] The above-mentioned further improvement on the air control system of the pneumatic screw pump thin-spray spraying machine is that the exhaust port of the switching valve is connected to the atmosphere through a muffler.

[0013] The above further improvement on the air control system of the pneumatic screw pump thin-spray sprayer is that the control circuit also includes a stop valve, the stop valve is connected to the output port of the three-position five-way valve, and the output port of the stop valve is connected to the nozzle.

[0014] Compared with the prior art, the pneumatic screw pump thin-spray spray machine air control system provided by this patent avoids the electrical system and realizes the functions of "manual near control" and "manual remote control". The near control and remote control operations have an interlocking function. In particular, the "manual remote control" mode can realize the forward start of the bidirectional air motor and the delayed stop of the forward and reverse rotation when shutting down, release the residual material pressure in the feed pipe, improve the spraying quality, and reduce the waste of spraying materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the schematic diagram of the gas control system;

[0016] Figure 2 This is a schematic diagram of a bidirectional air motor rotating forward in the near control mode;

[0017] Figure 3 This is a schematic diagram of the remote control mode when the switching valve has been actuated and the on-off valve has not been actuated (the bidirectional air motor is in the forward rotation state but has not yet rotated);

[0018] Figure 4 This is a schematic diagram of the remote control mode when the switching valve has been reset but the on-off valve has not been reset (the bidirectional air motor is reversing).

[0019] In the figure, 1-air source, 2-T-type three-way ball valve, 3-main circuit air source processor, 4-on / off valve, 5-switching valve, 6-bidirectional air motor, 7-muffler, 8-control circuit air source processor, 9-three-position five-way valve, 10-stop valve, 11-nozzle, 12-manual valve one, 13-manual valve two, 14-manual valve three, 15-shuttle valve one, 16-shuttle valve two, 17-one-way throttling speed regulating valve, 18-auxiliary gas tank. DETAILED DESCRIPTION

[0020] This patent provides an air control system for a coal mine pneumatic screw pump thin-spray spraying machine. The patent is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] The air control system of the coal mine pneumatic screw pump thin spraying machine includes an air source 1 and a T-type three-way ball valve 2 connected to the air source 1 for accessing the air source. The circuit connected to the air source 1 is divided into two circuits through the T-type three-way ball valve 2 to form a main circuit and a control circuit.

[0022] The main circuit includes a main circuit gas source processor 3, a switch valve 4, a switching valve 5, a bidirectional air motor 6, and a muffler 7. The main circuit gas source processor 3 filters, removes water, and adds oil to the compressed gas entering the main circuit.

[0023] The switch valve 4 is connected to the output port of the T-type three-way ball valve 2 through the main circuit air source processor 3, the input port of the switching valve 5 is connected to the output port of the switch valve 4, the two output ports of the switching valve 5 are respectively connected to the two input ports of the bidirectional air motor 6, and the exhaust port of the switching valve 5 is connected to the atmosphere through the muffler 7.

[0024] The compressed gas from the air source 1 flows into the main circuit air source processor 3 through the T-type three-way ball valve 2, and after being filtered, dehydrated, and refueled by the main circuit air source processor 3, it enters the switch valve 4 that controls the start and stop of the two-way air motor 6, and then passes through the switching valve 5 that controls the forward and reverse rotation of the two-way air motor 6 to drive the two-way air motor 6 to rotate. The compressed gas discharged by the two-way air motor 6 enters the switching valve 5, and then is discharged into the atmosphere through the muffler 7 connected to the switching valve 5. The forward rotation of the two-way air motor 6 drives the screw pump to transport the spray material to the nozzle 11, and then spray it onto the construction surface. The reverse rotation of the two-way air motor 6 drives the screw pump to reverse, and the spray material in the feed pipe is returned to the hopper to complete the pipeline pressure relief.

[0025] The control circuit includes a control circuit gas source processor 8, a three-position five-way valve 9, a stop valve 10, a manual valve 12, a manual valve 2 13, a manual valve 3 14, a shuttle valve 15, and a shuttle valve 2 16. The input port of the three-position five-way valve 9 is connected to the output port of the T-type three-way ball valve 2 through the control circuit gas source processor 8, the stop valve 10 and the input ports of the manual valve 12 are connected to the output port 1 of the three-position five-way valve 9, the output port of the stop valve 10 is connected to the atmosphere through the nozzle 11, the input port of the manual valve 2 13 and the input port of the manual valve 3 14 are connected to the output port 2 of the three-position five-way valve 9. The two input ports of the shuttle valve 15 are respectively connected to the output ports of the manual valve 12 and the manual valve 2 13, and the output port of the shuttle valve 15 is connected to the control port of the switching valve 5. One of the two input ports of shuttle valve 2 16 is connected to the output port of manual valve 1 13 through the one-way throttling speed regulating valve 17, and the other is connected to the output port of manual valve 3 14. The output port of shuttle valve 2 16 is connected to the control port of switch valve 4. The input port of auxiliary gas tank 18 is connected to the input port of shuttle valve 2 16 which is in communication with the one-way throttling speed regulating valve 17.

[0026] The compressed gas enters the control loop and is filtered and dehydrated through the control loop air source processor 8, and then enters the three-position five-way valve 9. The three-position five-way valve 9 is divided into three positions, and different positions realize the switching and interlocking of the working states of local control, stop, and remote control.

[0027] See also Figure 2 When the three-position five-way valve 9 works in the proximity control mode, the compressed gas enters the manual valve 2 13 and the manual valve 3 14. In the proximity control mode of the manual valve 2 13, the air pressure signal is transmitted to the switching valve 5 through the shuttle valve 1 15, and the action of the manual valve 2 13 realizes the forward and reverse switching of the two-way air motor 6. In the proximity control mode of the manual valve 3 14, the air pressure signal is transmitted to the switch valve 4 through the shuttle valve 2 16, and the action of the manual valve 3 14 realizes the start and stop of the two-way air motor 6.

[0028] See also Figure 1 When the three-position five-way valve 9 is in stop mode, there is no air pressure at the output end of the three-position five-way valve 9 and the system is in a stopped state.

[0029] See also Figure 3 , 4 When the three-position five-way valve 9 is in remote control mode, the compressed gas enters the manual valve 12 and the stop valve 11, the stop valve 10 is opened, and the nozzle 11 has an atomizing airflow sprayed out for atomizing the spray material. The manual valve 12 transmits the pressure signal to the switching valve 5 through the shuttle valve 15, and transmits the pressure signal to the switch valve 4 through the shuttle valve 2 16, so as to realize the remote control of the start and stop, forward and reverse rotation of the motor. The one-way throttling speed regulating valve 17 and the auxiliary gas tank 18 work together to control the delay time of the pressure signal release of the switch valve 4. The shuttle valve 15 and the shuttle valve 2 16 perform "OR" gate logic isolation on the pressure signals entering the switch valve 4 and the switching valve 5 in the remote control mode and the local control mode.

[0030] In order to better understand the gas control system provided by this patent, the working process of the gas control system is briefly introduced in conjunction with the accompanying drawings.

[0031] Stop Mode

[0032] See also Figure 1 The T-type three-way ball valve 2 has four working positions. One valve can realize the functions of separate air supply, simultaneous air supply, and simultaneous closing of the main circuit and the control circuit, which is convenient for equipment maintenance and realizes the "AND" gate control of the normal operation of the entire air control system. When the T-type three-way ball valve 2 is opened, the compressed gas enters the main circuit and the control circuit respectively through the T-type three-way ball valve 2, the three-position five-way valve 9 is in the middle stop position, there is no pressure signal in the control circuit, and the two-way air motor 6 stops.

[0033] Proximity Mode

[0034] See also Figure 2 , when the three-position five-way valve 9 is in the near control position, the manual valve 1 12 has no air pressure, and the compressed gas enters the manual valve 2 13 and the manual valve 3 14. Open the manual valve 3 14, the compressed gas enters the control port of the switch valve 4, the air pressure signal pushes the switch valve 4 to open, and the compressed gas enters the two-way air motor 6 to start. Close the manual valve 3 14, the gas at the control port of the switch valve 4 is discharged through the manual valve 3 14, the switch valve 4 is closed, and the two-way air motor 6 stops. Similarly, open the manual valve 2 13, the compressed gas enters the control port of the switching valve 5, the air pressure signal pushes the switching valve 5 to open, and the two-way air motor 6 is in the forward state; close the manual valve 2 13, the gas at the control port of the switching valve 5 is discharged through the manual valve 2 13, the switching valve 5 is closed, and the two-way air motor 6 is in the reverse state.

[0035] Remote control mode

[0036] See also Figure 3, the three-position five-way valve 9 is in the remote control position, the manual valve 2 13 and the manual valve 3 14 have no air pressure, the compressed gas enters the manual valve 12 and the stop valve 10, the stop valve 10 is opened, the compressed air enters the nozzle, and then the manual valve 12 is opened, and a branch connected to the outlet of the manual valve 12 enters the switching valve 5 through the shuttle valve 15, pushing the switching valve 5 to operate, and the two-way air motor 6 is in the forward state, and the compressed gas of the other branch connected to the outlet of the manual valve 12 passes through the one-way throttling speed regulating valve 17 and enters the switch valve 4 through the shuttle valve 2 16, and the two-way air motor 6 starts forward, wherein the auxiliary gas tank 18 has the function of storing energy, and controls the switch valve 4 to delay the action time compared with the switch valve 5, so as to avoid the reverse misstart of the two-way air motor 6. The forward rotation of the two-way air motor 6 drives the screw pump to rotate forward, and the spraying material is delivered to the nozzle 11, and the gas output through the stop valve 10 is mixed and atomized and sprayed out.

[0037] See also Figure 4 When spraying stops, close the manual valve 12, and the pressure gas at the control port of the switch valve 4 and the control port of the switching valve 5 is discharged into the atmosphere through the manual valve 12. The pressure gas of the switching valve 5 is discharged quickly without throttling, and the switching valve 5 quickly moves (resets) to the reverse position. The switch valve 4 cannot be reset immediately due to the delayed effect of the one-way throttle valve 17 and the auxiliary gas tank 18. The two-way air motor 6 starts to reverse, driving the screw pump to reverse and release pressure. After a time delay, the pressure gas of the auxiliary gas tank 18 is emptied, the switch valve 4 is reset, and the two-way air motor 6 stops reversing. This function can prevent excess pressure in the conveying pipe, prevent pulses in the spraying discharge, affect the spraying quality, and reduce the load for restarting.

Claims

1. The air control system of the pneumatic screw pump thin spraying machine includes an air source, a main circuit and a control circuit connected to the air source; its characteristics are: The main circuit includes a switch valve, a switching valve, and a bidirectional air motor. The switch valve is connected to the air source, the switching valve input port is connected to the switch valve output port, and the two output ports of the switching valve are respectively connected to the two input ports of the bidirectional air motor; The control circuit includes a three-position five-way valve, a manual valve 1, a manual valve 2, a manual valve 3, a shuttle valve 1, and a shuttle valve 2. The three-position five-way valve input port is connected to an air source, the manual valve 1 input port is connected to the three-position five-way valve output port 1, the manual valve 2 input port and the manual valve 3 input port are connected to the three-position five-way valve output port 2, the shuttle valve 1 input port 1 and the shuttle valve 1 input port 2 are respectively connected to the manual valve 1 output port and the manual valve 2 output port, the shuttle valve 2 input port 1 is connected to the manual valve 3 output port, and the shuttle valve 2 input port 2 is connected to the manual valve 1 output port through a one-way throttling speed regulating valve. The switch valve and the switching valve are pressure-controlled reversing valves; the output port of the shuttle valve 1 is connected to the control port of the switching valve, and the output port of the shuttle valve 2 is connected to the control port of the switch valve.

2. The pneumatic screw pump thin-spray spraying machine air control system as claimed in claim 1, characterized in that: The control loop also includes an auxiliary gas tank, and an input port of the auxiliary gas tank is connected to the second input port of the shuttle valve.

3. The pneumatic screw pump thin spraying machine air control system as claimed in claim 1 is characterized by: The gas source is connected to the switch valve in the main circuit and the input port of the three-position five-way valve in the control circuit respectively through the two output ports of the T-type three-way ball valve.

4. The pneumatic screw pump thin-spray spraying machine air control system as claimed in claim 1, characterized in that: The gas source is connected to the switch valve through an output port of the T-type three-way ball valve through a main circuit gas source processor for filtering and removing water from the compressed gas entering the main circuit; the gas source is connected to the input port of the three-position five-way valve through another output port of the T-type three-way ball valve through a control circuit gas source processor for filtering and removing water from the compressed gas entering the control circuit.

5. The pneumatic screw pump thin spraying machine air control system as claimed in claim 1, characterized in that: The exhaust port of the switching valve is connected to the atmosphere through a muffler.

6. The pneumatic screw pump thin-spray spraying machine air control system as claimed in claim 1, characterized in that: The control circuit also includes a stop valve, which is connected to an output port 1 of the three-position five-way valve, and the output port of the stop valve is communicated with the nozzle.

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