Automatic pulping butterfly valve control system for coal mine

Abstract

The invention discloses an automatic pulping butterfly valve control system for a coal mine, which improves the accuracy of monitoring the state of a butterfly valve by utilizing the linkage relationship between machines and air pressure induction, thereby reducing the metering deviation, and the mechanical and pneumatic systems are generally safer than an electronic system in a flammable and explosive coal mine environment. The installation and maintenance difficulty caused by complex circuits or sensitive electronic elements is also reduced; the state of the butterfly valve can be effectively monitored in real time under the conditions of dust, moisture and rough operation in a coal mine, and timely adjustment feedback is provided. And the reliability is improved while the overall structure is simplified, and the device is suitable for industrial large-scale use and popularization.

Description

Technical Field

[0001] The present invention belongs to the field of coal mine safety, and particularly relates to a control system for an automated coal mine slurry-making butterfly valve. Background Art

[0002] During the process of coal mine gas drainage, in order to improve the drainage efficiency, it is usually necessary to inject slurry into the drainage boreholes to seal pores, reinforce the shaft wall, and prevent gas leakage. The existing process for preparing the sealing slurry involves the mixing and transportation of powder materials, water, and various additives. Its accurate proportioning and uniform stirring have a crucial impact on the final sealing effect and the safety of gas drainage. However, at present, most coal mine enterprises still use manual or semi-manual methods for batching and valve switching during the slurry-making process. This not only has a high labor intensity but also easily causes problems such as proportioning deviation and insufficient stirring, resulting in the slurry quality being difficult to stably guarantee, and further affecting the gas drainage efficiency and safety.

[0003] Therefore, it is particularly important to realize the automation and intelligent control of the slurry-making process. As a common regulating and cut-off component in the slurry-making system, the opening degree and the opening and closing timing of the butterfly valve will directly affect the flow rate of the slurry, the pipeline pressure, and the proportioning. The key to controlling the butterfly valve is whether the working state of the valve can be accurately obtained and timely feedback. Currently, all existing technologies use electronic sensors to detect the action state of the valve shaft or monitor the valve plate state, which are of two types: direct contact and non-contact. Although this technology has been proven to be mature and effective in many application environments, there are many potential problems when it is used in the coal mine environment: coal dust and solid particles generated during the slurry-making process will penetrate into the interior of the sensor, resulting in its failure or inaccurate readings; a large amount of water and chemical mixtures used in the slurry-making will corrode the electronic components of the sensor, damaging the circuit or reducing its performance; long-term exposure to a high-humidity environment will cause the oxidation or short-circuit of the electronic components inside the sensor.

[0004] In summary, the method of using electronic sensors to detect the working state of the valve in the existing technology is not applicable to coal mine underground operations, with a complex structure and insufficient reliability. Summary of the Invention

[0005] The purpose of the present invention is to provide a control system for an automated coal mine slurry-making butterfly valve to solve the problems of complex structure and insufficient reliability in the control system of the existing technology.

[0006] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0007] A control system for an automated coal mine slurry-making butterfly valve includes a slurry-making system and a gas source. The gas source is connected to a pneumatic solenoid valve through an air pipe; it also includes a valve island box, and the pneumatic solenoid valve is installed in the valve island box.

[0008] A butterfly valve and a swing cylinder are installed on the pulping pipeline of the described pulping system. The pneumatic solenoid valve is connected to the swing cylinder through an air pipe. The cylinder rotating shaft of the swing cylinder is connected to the valve rotating shaft of the butterfly valve through a coupling. On both sides of the upper part of the swing cylinder mounting frame, a first valve position induction switch and a second valve position induction switch are horizontally arranged respectively.

[0009] The first valve position induction switch and the second valve position induction switch have the same structure.

[0010] The first valve position induction switch includes a tubular switch housing. The inner wall of the front end of the switch housing is a slope angle structure with an offset central axis inward. Inside the switch housing, a ball, a push rod piston and a nesting are arranged in sequence from front to back. The ball can roll horizontally inside the switch housing, and the ball can be stuck in it by the slope angle structure of the switch housing and the front end of the ball can partially protrude from the front end of the switch housing. The push rod piston divides the switch housing into a front chamber and a rear chamber.

[0011] The rear end of the push rod piston is located inside the nesting and has a distance from the slider. A slider spring is arranged in the rear area of the slider. The front part of the nesting is an installation cavity, and the rear part is a communication cavity, and the inner diameter of the communication cavity is smaller than that of the installation cavity. The rear end of the slider spring is fixedly installed on the step surface formed by the installation cavity and the communication cavity inside the nesting. The shape of the slider matches the shape of the communication cavity inside the nesting, and the slider can slide backward in the installation cavity of the nesting to conduct the communication cavity, the installation cavity and the rear chamber of the switch housing. A push rod spring is sleeved on the push rod of the push rod piston.

[0012] The rear end of the nesting is respectively connected to an air inlet joint and an air outlet joint arranged in parallel. There is an annular space between the outer wall of the front part of the nesting and the inner wall of the switch housing. The output end of the air outlet joint is communicated with this annular space, and the input end of the air inlet joint is communicated with the communication cavity of the nesting.

[0013] The air source is also respectively connected to the air inlet joints of the first valve position induction switch and the second valve position induction switch. The air outlet joints of the first valve position induction switch and the second valve position induction switch are respectively connected to a signal transmitter, and the two signal transmitters are respectively connected to a controller. The controller is also connected to the pneumatic solenoid valve.

[0014] The controller is used to control the opening and closing of the pneumatic solenoid valve, receive the information of the two signal transmitters, determine the actual opening and closing state of the pneumatic solenoid valve according to the received information and perform process action control.

[0015] A paddle is provided at the upper part of the swing cylinder. The swing cylinder can swing itself to press the ball of the first valve position induction switch or the second valve position induction switch backward into the interior of the switch housing, thereby enabling the slider to conduct the communication cavity, the installation cavity and the rear cavity of the switch housing.

[0016] The present invention further has the following features:

[0017] Further, the first valve position induction switch and the second valve position induction switch are respectively arranged on both sides of the rotation circumference of the paddle of the swing cylinder.

[0018] Further, the signal transmitter includes a pressure sensor, an air circuit block and a plug;

[0019] The pressure sensor is arranged on the air passage opened on the upper part of the air circuit block, and the pressure sensor is connected to the controller;

[0020] One end of the air circuit block is connected to its corresponding air outlet joint through a joint, and the other end is closed with a plug.

[0021] Further, a sealing ring is arranged between the push rod piston and the inner wall of the switch housing.

[0022] Further, a positioning ring is arranged at the front part of the nested installation cavity; the positioning ring is used to prevent the slider from disengaging from the front end of the nested installation cavity.

[0023] Further, both the first valve position induction switch and the second valve position induction switch are fixedly installed on the swing cylinder mounting bracket through at least one locking nut.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] The coal mine automatic pulp-making butterfly valve control system of the present invention utilizes the linkage relationship between mechanisms and air pressure induction to improve the accuracy of monitoring the state of the butterfly valve, thereby reducing the measurement deviation. Mechanical and pneumatic systems are usually safer than electronic systems in the flammable and explosive coal mine environment, and also reduce the installation and maintenance difficulties caused by complex circuits or sensitive electronic components; it can also effectively and real-timely monitor the state of the butterfly valve in the face of dust, moisture and rough operating conditions in coal mines, and provide timely adjustment feedback. While simplifying the overall structure, it improves the reliability and is suitable for large-scale industrial use and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the schematic diagram of the coal mine automatic pulp-making butterfly valve control system of the present invention;

[0027] Figure 2 is the schematic diagram of the connection structure of the butterfly valve and the swing cylinder in the present invention;

[0028] Figure 3 is a schematic structural diagram of the valve position induction switch in the present invention;

[0029] Figure 4 is a schematic structural diagram of the signal transmitter in the present invention;

[0030] Figure 5 is a schematic structural diagram of the swing cylinder paddle and the valve position induction switch in the present invention.

[0031] The meanings of the labels in the figure are as follows:

[0032] 1, air source; 2, pneumatic solenoid valve; 3, butterfly valve; 4, swing cylinder; 5, cylinder rotating shaft; 6, valve rotating shaft; 7, coupling; 8, first valve position induction switch; 9, second valve position induction switch; 10, switch housing; 11, ball; 12, push rod piston; 13, nesting; 14, slider; 15, slider spring; 16, air outlet joint; 17, air inlet joint; 18, signal transmitter; 19, controller; 20, paddle; 21, pressure sensor; 22, air circuit block; 23, plug; 24, sealing ring; 25, positioning ring; 26, push rod piston spring. Specific embodiments

[0033] It should be noted that all components in the present invention, unless otherwise specified, are all components known in the prior art. For example, swing cylinders, signal transmitters, and controllers use commonly known components.

[0034] All methods in the present invention, unless otherwise specified, are all methods known in the prior art. For example, the method of the controller controlling the opening and closing of the pneumatic solenoid valve is a method known in the prior art.

[0035] This embodiment is only an example to illustrate the spirit of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0036] As Figures 1 to 3 shown, a coal mine automated pulp-making butterfly valve control system includes a pulp-making system and an air source 1, and the air source 1 is connected to the pneumatic solenoid valve 2 through a trachea; it also includes a valve island box, and the pneumatic solenoid valve 2 is installed in the valve island box;

[0037] A butterfly valve 3 and a swing cylinder 4 are installed on the pulp-making pipeline of the pulp-making system, and the pneumatic solenoid valve 2 is connected to the swing cylinder 4 through a trachea; the cylinder rotating shaft 5 of the swing cylinder 4 is connected to the valve rotating shaft 6 of the butterfly valve 3 through a coupling 7; on both sides of the upper part of the mounting frame, a first valve position induction switch 8 and a second valve position induction switch 9 are horizontally arranged respectively;

[0038] The first valve position induction switch 8 and the second valve position induction switch 9 have the same structure.

[0039] As a specific implementation manner, the positions of the first valve position induction switch 8 and the second valve position induction switch 9 should correspond to the position of the butterfly valve. Optionally, the first valve position induction switch 8 and the second valve position induction switch 9 are arranged at 90°.

[0040] The first valve position induction switch 8 includes a tubular switch housing 10;

[0041] The inner wall of the front end of the switch housing 10 is a slope angle structure with an offset central axis inward. Inside the switch housing 10, a ball 11, a push rod piston 12, and a nest 13 are sequentially arranged from front to back; the ball 11 can roll horizontally inside the switch housing 10, and the slope angle structure of the switch housing 10 can limit the ball 11 from completely coming out of the switch housing 10; the push rod piston divides the switch housing into a front chamber and a rear chamber;

[0042] There is a distance between the rear end of the push rod piston 12 and the slider 14, and this distance is set by those skilled in the art according to the actual component specifications. A slider spring 15 is arranged in the small diameter of the rear part area of the slider 14; the front part of the nest 13 is an installation cavity, and the rear part is a communication cavity, and the inner diameter of the communication cavity is smaller than that of the installation cavity. The other end of the slider spring 15 is fixedly installed on the step surface formed by the installation cavity and the communication cavity in the nest 13; the shape of the slider 14 matches the shape of the communication cavity in the nest 13, and the slider 14 can block the installation cavity of the nest 13;

[0043] The rear end of the nest 13 is respectively connected to an air outlet joint 16 and an air inlet joint 17 arranged in parallel; there is an annular space between the outer wall of the front part of the nest 13 and the inner wall of the switch housing 10; the output end of the air outlet joint 16 is communicated with the annular space, and the input end of the air inlet joint 17 is communicated with the communication cavity of the nest 13;

[0044] The air source 1 is also respectively connected to the air inlet joints 17 of the first valve position induction switch 8 and the second valve position induction switch 9; the air outlet joints 16 of the first valve position induction switch 8 and the second valve position induction switch 9 are respectively connected to a signal transmitter 18, and the two signal transmitters 18 are respectively connected to a controller 19; the controller 19 is also connected to the pneumatic solenoid valve 2;

[0045] A dial 20 is arranged on the upper part of the swing cylinder 4. The swing cylinder 4 can swing itself to make the dial 20 press the ball 11 of the first valve position induction switch 8 or the second valve position induction switch 9 backward into the inside of the switch housing 10, so that the rear end face of the push rod piston 12 fits with the slider 14 to block the exhaust passage;

[0046] The controller 19 is used to control the opening and closing of the pneumatic solenoid valve 2, receive the information from two signal transmitters 18, determine the actual opening and closing state of the pneumatic solenoid valve 2 according to the received information, and perform process action control.

[0047] The working process of the present invention is as follows:

[0048] When the butterfly valve 3 needs to be opened, the controller 19 issues an opening command signal. The left electromagnet of the pneumatic solenoid valve 2 drives its own valve core to commutate by means of electric propulsion. Gas enters the working chamber of the swing cylinder 4, and the swing cylinder 4 drives the cylinder rotating shaft 5 of itself to rotate. The lower part of the cylinder rotating shaft 5 drives the valve rotating shaft 6 through the coupling 7, and the valve rotating shaft 6 drives the valve of the butterfly valve 3 to open.

[0049] At the same time, the swing cylinder 4 drives the dial 20 to rotate synchronously. The dial 20 leaves the first valve position induction switch 8 installed at the closed position of the butterfly valve 3, and the dial 20 is separated from the ball 11 of the first valve position induction switch 8. The push rod piston spring 26 loses the external acting force and moves forward under the action of its own spring restoring force. The ball 11 moves forward until the ball 11 contacts the limit slope angle at the front end of the switch housing 10.

[0050] The push rod piston 12 is separated from the slider 14 installed in the nest 13. The slider spring 15 on the slider loses the external acting force and moves forward under the action of its own spring restoring force. At this time, the air passage between the air outlet joint 16 and the air inlet joint 17 is closed, and the air passage in the push rod piston 12 and the vent hole at the front end of the switch housing 10 are conducted. The air in the signal transmitter is discharged, the pressure in the pipeline is 0, and the pressure switch diaphragm resumes.

[0051] When the dial 20 rotates with the cylinder rotating shaft 5 to the second valve position induction switch 9 installed at the open position of the butterfly valve 3, the dial 20 contacts the ball 11 on the switch housing 10 of the second valve position induction switch 9. The ball presses the push rod piston 12 and compresses the push rod spring 26. The push rod piston moves to fit with the slider 14. The vent hole passage at the front end of the switch housing 10 is closed. The push rod piston pushes the slider to move, and the slider spring 15 is compressed to the minimum position. The air inlet joint 17, the nested gap and the air outlet joint 16 are conducted. Gas enters the gas path block of the signal transmitter 6, the pressure in the pipeline is the set air pressure, the pressure switch diaphragm is pressed, triggering the changeover switch, and transmitting the switch quantity signal to the controller 19. The controller displays that the valve is open.

[0052] When the butterfly valve 3 needs to be closed, the controller 19 sends an open / close signal, the right electromagnet of the pneumatic solenoid valve 2 is energized to push the valve core to change direction, the gas enters the reset chamber of the swing cylinder 4, the swing cylinder pushes the cylinder shaft 5 to rotate, the lower part of the cylinder shaft drives the valve shaft 6 to rotate through the coupling 7, the valve shaft drives the valve plate fixed on it to move, and the valve is closed. At the same time, the paddle 20 on the upper part of the cylinder shaft rotates synchronously, the paddle leaves the second valve position sensing switch 9 installed on the open position of the butterfly valve, the paddle is out of contact with the ball 11 on the switch, the push rod spring 26 on the push rod piston 12 in contact with the ball loses the external force, moves forward under the action of its own spring restoring force, and extends out of the switch housing 10 until the ball contacts the limit slope angle at the front end of the switch housing 10. The push rod piston is separated from the slider 14 installed in the nest 13, and the slider spring 15 on the slider loses the external force and moves forward under the action of its own spring restoring force. At this time, the ventilation channels of the air inlet joint 17 and the air outlet joint 16 are closed, and the ventilation channels in the air outlet joint 16, the push rod piston and the front air vent of the switch housing 10 are connected, the air in the air circuit block of the signal transmitter 6 is discharged, the pressure in the pipeline is 0, and the pressure switch diaphragm is restored.

[0053] When the paddle 20 rotates with the cylinder shaft 41 to the first valve position sensing switch 8 installed on the butterfly valve closing position, the paddle 20 contacts the ball 11 of the switch housing 10 of the first valve position sensing switch 8, the ball squeezes the push rod piston 12 and compresses the push rod spring 26, the push rod piston moves to fit with the slider 14, the ventilation channel of the front vent hole of the switch housing 10 is closed, the push rod piston pushes the slider to move, the slider spring 15 is compressed to the minimum position, the air inlet joint 17, the nesting gap and the air outlet joint 17 are connected, the gas enters the signal transmitter 6 gas circuit block, the pressure in the pipeline is the set air pressure, the pressure switch diaphragm is compressed, the conversion switch is triggered, the switch signal is transmitted to the controller 19, and the controller displays that the valve is closed.

[0054] As a preferred solution, the first valve position sensing switch 8 and the second valve position sensing switch 9 are respectively arranged on both sides of the rotating circle of the paddle 20 of the swing cylinder 4, and the axial angle is 90°. This arrangement can ensure that the paddle 20 is in full contact with the ball 11, with high pushing efficiency. It can also manually judge the valve opening state, and the process state can be checked without disassembly.

[0055] As a preferred solution, Figure 4 As shown, the signal transmitter 18 includes a pressure sensor 21, an air circuit block 22 and a screw plug 23; the pressure sensor 21 is arranged on the air passage opened on the upper part of the air circuit block 22, and the pressure sensor 21 is electrically connected to the controller; one end of the air circuit block 22 is connected to the corresponding air outlet connector 17 through a connector, and the other end is closed with a screw plug 23.

[0056] As a preferred solution, a sealing ring 24 is provided between the piston push rod 12 and the inner wall of the switch housing 10 to improve the sealing performance between components.

[0057] As a preferred solution, positioning rings 25 are provided throughout the installation cavity of the nest 13; the positioning rings 25 are used to prevent the slider 14 from disengaging from the front end of the installation cavity.

[0058] As a preferred solution, both the first valve position induction switch 8 and the second valve position induction switch 9 are fixedly installed on the mounting bracket through at least one lock nut. The lock nut is used to compensate and adjust the distance between the valve position induction switch and the paddle 20, reliably ensuring sufficient contact between the first valve position induction switch 8 and the second valve position induction switch 9 and the paddle 20, and avoiding poor contact between the two caused by vibration.

Claims

1. A coal mine automated pulp-making butterfly valve control system, including a pulp-making system and a gas source (1), is characterized in that The described air source (1) is connected to the pneumatic solenoid valve (2); it further includes a valve island box, and the pneumatic solenoid valve (2) is installed inside the valve island box; A butterfly valve (3) and a swing cylinder (4) are installed on the pulp-making pipeline of the described pulp-making system through a mounting rack. The pneumatic solenoid valve (2) is connected to the swing cylinder (4) through an air pipe; the cylinder rotating shaft (5) of the swing cylinder (4) is connected to the valve rotating shaft (6) of the butterfly valve (3) through a coupling (7); on both sides of the upper part of the mounting rack, a first valve position induction switch (8) and a second valve position induction switch (9) are horizontally arranged respectively; The first valve position induction switch (8) and the second valve position induction switch (9) have the same structure; The first valve position induction switch (8) includes a tubular switch housing (10); the inner wall of the front end of the switch housing (10) is a slope angle structure with an offset central axis inward. Inside the switch housing (10), a ball (11), a push rod piston (12), and a nest (13) are arranged in sequence from front to back; the ball (11) can roll horizontally inside the switch housing (10), the ball 11 can be stuck inside by the slope angle structure of the switch housing (10), and the front end of the ball 11 can protrude from the front end of the switch housing (10); the push rod piston (12) divides the switch housing into a front chamber and a rear chamber; The rear end of the push rod piston (12) is located inside the nest (13) and has a spacing from the slider (14). A slider spring (15) is arranged in the rear area of the slider (14); the front part of the nest (13) is an installation cavity, and the rear part is a communication cavity, and the inner diameter of the communication cavity is smaller than that of the installation cavity. The rear end of the slider spring (15) is fixedly installed on the step surface formed by the installation cavity and the communication cavity inside the nest (13); the shape of the slider (14) matches the shape of the communication cavity inside the nest (13), and the slider (14) can slide backward in the installation cavity of the nest (13) to conduct the communication cavity, the installation cavity, and the rear chamber of the switch housing; a push rod spring (26) is sleeved on the push rod of the push rod piston (12); The rear end of the nest (13) is respectively connected to an air outlet joint (16) and an air inlet joint (17) arranged in parallel; there is an annular space between the outer wall of the front part of the nest (13) and the inner wall of the switch housing (10); the input end of the air inlet joint (16) is communicated with the communication cavity of the nest (13), and the output end of the air outlet joint (17) is communicated with this annular space; The air source (1) is also respectively connected to the air inlet joints (17) of the first valve position induction switch (8) and the second valve position induction switch (9); the air outlet joints (16) of the first valve position induction switch (8) and the second valve position induction switch (9) are respectively connected to a signal transmitter (18), and the two signal transmitters (18) are respectively connected to a controller (19); the controller (19) is also connected to the pneumatic solenoid valve (2); The described controller (19) is used to control the opening and closing of the pneumatic solenoid valve (2), receive information from two signal transmitters (18), determine the actual opening and closing state of the pneumatic solenoid valve (2) based on the received information, and perform process action control; A paddle (20) is provided on the upper part of the described swing cylinder (4). The swing cylinder (4) can swing itself to press the ball (11) of the first valve position induction switch (8) or the second valve position induction switch (9) backward into the interior of the switch housing (10) through the paddle (20), thereby enabling the slider (14) to conduct the communication cavities, installation cavities and the rear cavity of the switch housing of the nested (13).

2. The coal mine automated pulp making butterfly valve control system according to claim 1, wherein The described first valve position induction switch (8) and the second valve position induction switch (9) are respectively arranged on both sides of the rotation circumference of the paddle (20) of the swing cylinder (4).

3. The coal mine automated pulp-making butterfly valve control system according to claim 1, characterized in that, The described signal transmitter (18) includes a pressure sensor (21), a gas path block (22) and a plug (23); The pressure sensor (21) is arranged on the gas passage opened on the upper part of the gas path block (22), and the pressure sensor (21) is connected to the controller; One end of the gas path block (22) is connected to its corresponding air outlet joint (17) through a joint, and the other end is closed with a plug (23).

4. The coal mine automated pulp making butterfly valve control system according to claim 1, characterized in that, A sealing ring (24) is arranged between the push rod piston (12) and the inner wall of the switch housing (10).

5. The coal mine automated pulp making butterfly valve control system according to claim 4, characterized in that, A positioning ring (25) is arranged at the front part of the installation cavity of the nested (13); the positioning ring (25) is used to prevent the slider (14) from disengaging from the front end of the installation cavity of the nested (13).

6. The coal mine automated pulp making butterfly valve control system according to any one of claims 1 to 5, characterized in that, Both the described first valve position induction switch (8) and the second valve position induction switch (9) are fixedly installed on the described mounting bracket through at least one lock nut.

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