Automatic drilling and grinding system of under-pressure operation machine

Abstract

The invention relates to the technical field of under-pressure operation machines, in particular to an automatic drilling and grinding system of an under-pressure operation machine. The device comprises a hydraulic pump, a hydraulic loop, a turntable motor, a drilling and grinding control unit, a torque setting unit and a rotating speed setting unit. According to the control system, the main control module outputs a control signal through the signal control circuit to control the motor, then the motor drives the rotating disc speed regulating valve, the rotating disc pilot reversing valve, the rotating disc torque regulating valve and the reaction torque release valve to rotate, and the rotating speed, the rotating direction and the output torque of the rotating disc motor can be adjusted; the main control module detects the rotating speed of the rotating disc in real time through the rotating speed detection circuit, correspondingly adjusts the opening degree of the valve according to the detected rotating speed change of the rotating disc, and compares and adjusts the valve opening degree value fed back by the opening degree detection assembly with a set value, so that the valve opening degree reaches and is kept at the needed position, and the rotating speed of the rotating disc is kept stable. Therefore, the underground drilling and grinding efficiency is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure - operated workover rigs, and more specifically, to an automatic drilling and grinding system for a pressure - operated workover rig. Background Art

[0002] The pressure - operated workover rig mainly includes a hydraulic system, a control system, and a lifting system. Among them, the hydraulic system provides power for the equipment to enable the main machine to move. The control system is the core of the entire equipment, responsible for controlling parameters such as pressure, temperature, and speed. The lifting system realizes the up - and - down movement of the pipe string through a hydraulic cylinder hoist. As an important equipment in the modern industrial field, the coordinated work of its various components ensures the stable performance of the overall performance.

[0003] The pressure - operated workover rig drives the drill bit or drill pipe through the hydraulic system to increase the feed cutting force of the drill bit, thereby realizing drilling on the wall surface. When the pressure - operated workover rig performs a drilling operation underground, in order to better cut and break rocks or soil, a rotary table is generally provided. Then, during the drilling operation, the rotary table drives the drill string and the drill bit through rotation, so that the drill bit can drill and grind rocks or soil at the same time, improving the drilling effect.

[0004] During the drilling and grinding operation, the rotational speed needs to be adjusted according to the operation position. When performing the drilling and grinding operation in the upper formation, a higher rotational speed can be increased to accelerate the cutting speed of the drill bit on the formation. When performing the drilling and grinding operation in the lower hard formation, a high rotational speed will cause damage to the drill bit or insufficient rock fragmentation. Therefore, the rotational speed needs to be reduced, and a stable rotational speed needs to be maintained during the drilling and grinding operation. However, when performing the drilling and grinding operation, the rotary table will bear the reverse torque of the drill bit or drill string. Under the condition of resistance during drilling, the change of the downhole torque and the drilling output torque will make the rotational speed unstable, which will further lead to problems such as overheating of the drill bit, increased wear, and affect the downhole drilling and grinding efficiency.

[0005] In order to ensure the downhole drilling and grinding efficiency of the pressure - operated workover rig, an automatic drilling and grinding system for a pressure - operated workover rig is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide an automatic drilling and grinding system for a pressure - operated workover rig to solve the problems raised in the above - mentioned background art.

[0007] To achieve the above - mentioned purpose, the present invention provides an automatic drilling and grinding system for a pressure - operated workover rig, including a hydraulic pump and a hydraulic circuit connected to the hydraulic pump. A rotary table motor for driving the rotation of the drill bit or drill pipe is provided on the hydraulic circuit. A drilling and grinding control unit, a torque setting unit, and a rotational speed setting unit are also provided on the hydraulic circuit. The rotation speed setting unit includes a rotation speed control module and a commutation control module. The rotation speed control module is connected to the commutation control module, and the commutation control module is connected to the rotary table motor; The torque setting unit includes a torque control module and an anti-torque release module. The anti-torque release module is connected to the rotary table motor, and the torque control module is connected to the rotation speed control module and the commutation control module; The drilling and grinding control unit includes a main control module, a real-time feedback module, and a valve opening control module. The main control module detects the rotation speed of the rotary table motor through the real-time feedback module, and the main control module is connected to the rotation speed control module, the commutation control module, the torque control module, and the anti-torque release module through the valve opening control module; According to the rotation speed change detected by the real-time feedback module, the main control module releases the torque of the rotary table motor through the anti-torque release module, and adjusts the rotation direction, rotation speed, and torque of the rotary table motor through the commutation control module, the rotation speed control module, and the torque control module.

[0008] As a further improvement of this technical solution, the rotation speed control module includes a rotary table speed control valve and a balance valve arranged on the hydraulic circuit, and the commutation control module includes a rotary table pilot commutation valve and a rotary table hydraulic commutation valve arranged on the hydraulic circuit, The rotary table speed control valve is connected to the rotary table pilot commutation valve, the rotary table pilot commutation valve is connected to the rotary table hydraulic commutation valve, the rotary table hydraulic commutation valve is connected to the balance valve and the rotary table motor, and the balance valve is connected to the rotary table motor.

[0009] As a further improvement of this technical solution, the torque control module includes a rotary table torque regulating valve and a torque meter. The rotary table torque regulating valve is connected to the rotary table speed control valve and the rotary table hydraulic commutation valve. The anti-torque release module includes an anti-torque release valve. Both the anti-torque release valve and the torque meter are arranged on the circuit connecting the rotary table hydraulic commutation valve and the rotary table motor.

[0010] As a further improvement of this technical solution, the real-time feedback module includes a plurality of detection components. The number of detection components is the same as the number of rotary tables on the rotary table motor, and the detection components include a rotation speed detection circuit connected to the main control module.

[0011] As a further improvement of this technical solution, the rotation speed detection circuit includes a switch-type Hall sensor H, a triode Q1, and a magnet block arranged on the rotary table, One end of the switch-type Hall sensor H is connected to a resistor R1 and the VCC terminal. The other end of the switch-type Hall sensor H is connected to a resistor R2 and the other end of the resistor R1. The resistor R2 is connected to the base of the triode Q1; The collector of the triode Q1 is connected to the resistor R3 and then to the OUT terminal, the resistor R3 is connected to the VCC terminal, and the emitter of the triode Q1 is grounded.

[0012] As a further improvement of this technical solution, the valve opening control module includes a plurality of opening adjustment components and a plurality of opening detection components. The opening adjustment component includes a signal control circuit and a motor connected to the signal control circuit. The signal control circuit is connected to the main control module, and the motors are respectively arranged on the valve bodies of the rotary speed control valve, the rotary pilot control valve, the rotary torque control valve, and the anti-torque release valve to control the valve opening.

[0013] As a further improvement of this technical solution, the signal control circuit is an analog signal control circuit.

[0014] As a further improvement of this technical solution, the opening detection component includes a rotary encoder U3 and a level conversion chip U4 arranged on the valve body. Pin 1 of the rotary encoder U3 is connected to resistors R21, R36 and then to capacitor C11. The capacitor C11 is grounded. The resistor R36 is connected to pin 3 of the level conversion chip U4. The resistor R21 is connected to resistor R22 and then to the VCC_5V terminal. Pins 2, 6, and 7 of the rotary encoder U3 are all grounded. Pin 3 of the rotary encoder U3 is connected to capacitor C13, resistor R37 and then to the other end of the resistor R22. The resistor R37 is connected to pin 4 of the level conversion chip U4. Pin 4 of the rotary encoder U3 is connected to capacitor C12 and then grounded. Pin 5 of the rotary encoder U3 is connected to resistors R23, R38 and then to the other end of the capacitor C12. The resistor R23 is connected to the VCC_5V terminal. The resistor R38 is connected to pin 7 of the level conversion chip U4. Pin 1 of the level conversion chip U4 is connected to the VCC_5V terminal. Pins 11, 12, and 13 of the level conversion chip U4 are all grounded. Pins 23 and 24 of the level conversion chip U4 are both connected to the VCC_3.3V terminal.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the automatic drilling and grinding system of this workover rig, the main control module, according to the hardness of the formation, outputs a control signal through the signal control circuit to control the motor, and then drives the valves of the rotary speed control valve, the rotary pilot control valve, the rotary torque control valve, and the anti-torque release valve to rotate through the motor, so as to adjust the rotation speed, rotation direction, and output torque of the rotary table motor, and control the drill bit on the rotary table to perform drilling and grinding operations at different rotation speeds. During the drilling and grinding operation, the main control module real-time detects the rotation speed of the rotary table through the rotation speed detection circuit, then adjusts the opening degree of the above valves accordingly according to the measured change in the rotation speed of the rotary table, and compares and adjusts according to the valve opening degree value and the set value feedback by the opening degree detection component, so that the valve opening degree reaches and remains at the required position, maintaining the stability of the rotation speed of the rotary table, avoiding problems such as overheating and increased wear of the drill bit caused by unstable rotation speed, thereby ensuring the downhole drilling and grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the principle of the hydraulic control system of the present invention; Figure 3 It is a circuit diagram of the rotation speed detection of the present invention; Figure 4 It is the circuit of the opening degree detection component of the present invention Figure 1 ; Figure 5 It is the circuit of the opening degree detection component of the present invention Figure 2 .

[0017] The meanings of each label in the figure are as follows: 1, hydraulic pump; 2, rotary table speed control valve; 3, rotary table pilot change-over valve; 4, rotary table hydraulic change-over valve; 5, balance valve; 6, rotary table motor; 7, rotary table torque regulating valve; 8, anti-torque release valve; 9, torque meter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0019] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0020] Please refer to Figures 1 - 5As shown in the figure, the purpose of this embodiment is to provide an automatic drilling and grinding system for a pressure operation machine, which includes a hydraulic pump 1 and a hydraulic circuit connected to the hydraulic pump 1. A rotary table motor 6 for driving the drill bit or drill pipe to rotate is arranged on the hydraulic circuit. A drilling and grinding control unit, a torque setting unit, and a speed setting unit are also arranged on the hydraulic circuit. The speed setting unit includes a speed control module and a commutation control module. The speed control module is connected to the commutation control module, and the commutation control module is connected to the rotary table motor 6; The torque setting unit includes a torque control module and an anti-torque release module. The anti-torque release module is connected to the rotary table motor 6, and the torque control module is connected to the speed control module and the commutation control module; The drilling and grinding control unit includes a main control module, a real-time feedback module, and a valve opening control module. The main control module detects the speed of the rotary table motor 6 through the real-time feedback module. The main control module is connected to the speed control module, the commutation control module, the torque control module, and the anti-torque release module through the valve opening control module; According to the speed change detected by the real-time feedback module, the main control module releases the torque of the rotary table motor 6 through the anti-torque release module, and adjusts the rotation direction, speed, and torque of the rotary table motor 6 through the commutation control module, the speed control module, and the torque control module to keep the speed of the rotary table motor 6 stable.

[0021] The speed control module includes a rotary table speed control valve 2 and a balance valve 5 arranged on the hydraulic circuit. The commutation control module includes a rotary table pilot commutation valve 3 and a rotary table hydraulic commutation valve 4 arranged on the hydraulic circuit. The rotary table speed control valve 2 is connected to the rotary table pilot commutation valve 3. The rotary table pilot commutation valve 3 is connected to the rotary table hydraulic commutation valve 4. The rotary table hydraulic commutation valve 4 is connected to the balance valve 5 and the rotary table motor 6. The balance valve 5 is connected to the rotary table motor 6.

[0022] In the hydraulic circuit, pressure energy is generated by the hydraulic pump 1 to provide power for the hydraulic system. The rotary table speed control valve 2 adjusts the opening degree of the rotary table hydraulic commutation valve 4 to adjust the oil flow or pressure entering the rotary table motor 6, thereby realizing the adjustment of the speed of the rotary table motor 6; The rotary table pilot commutation valve 3 remotely controls the action of the rotary table hydraulic commutation valve 4 through the pressure difference generated by itself, and then changes the flow direction of the hydraulic oil in the hydraulic circuit through the rotary table hydraulic commutation valve 4, which can change the movement direction of the rotary table motor 6, thereby realizing the forward and reverse rotation control of the rotary table motor 6; The balance valve 5 can prevent the situation that the hydraulic oil flow or pressure of the rotary table motor 6 is too large due to the change of load during the drilling and grinding operation, and can make the rotary table motor 6 stop quickly by controlling the flow or pressure in the hydraulic circuit.

[0023] The torque control module includes a rotary table torque regulating valve 7 and a torque meter 9. The rotary table torque regulating valve 7 is connected to the rotary table speed regulating valve 2 and the rotary table hydraulic directional control valve 4. The anti-torque release module includes an anti-torque release valve 8. The anti-torque release valve 8 and the torque meter 9 are both arranged on the connecting circuit between the rotary table hydraulic directional control valve 4 and the rotary table motor 6.

[0024] When the rotary table motor is working, by adjusting the spool position of the rotary table torque regulating valve 7, the flow area of the hydraulic oil is changed to regulate the flow rate and pressure of the fluid, thereby regulating the torque output of the hydraulic system, and the output torque of the hydraulic system is displayed in real time by the torque meter 9. The anti-torque release valve 8 monitors and regulates the pressure and flow rate in the hydraulic system. When anti-torque is generated on the rotary table motor 6, the anti-torque release valve 8 will automatically adjust to release the excess torque, thereby protecting the rotary table and the equipment from damage. Specifically, when the rotary table encounters anti-torque during the drilling and grinding process, the anti-torque release valve 8 will respond to adjust the pressure and flow rate of the hydraulic system, reduce or eliminate the influence of the anti-torque, and ensure the smooth operation of the rotary table.

[0025] The real-time feedback module includes a plurality of detection components. The number of detection components is the same as the number of rotary tables on the rotary table motor 6, and the detection components include a speed detection circuit connected to the main control module.

[0026] The speed detection circuit includes a switch-type Hall sensor H, a triode Q1, and a magnet block arranged on the rotary table. One end of the switch-type Hall sensor H is connected to a resistor R1 and then connected to the VCC terminal. The other end of the switch-type Hall sensor H is connected to a resistor R2 and then connected to the other end of the resistor R1. The resistor R2 is connected to the base of the triode Q1. The collector of the triode Q1 is connected to a resistor R3 and then connected to the OUT terminal. The resistor R3 is connected to the VCC terminal. The emitter of the triode Q1 is grounded.

[0027] When the speed detection circuit rotates with the rotary table, signals are generated according to the distance between the switch-type Hall sensor H and the magnet block. Specifically, when the rotary table rotates to drive the magnet block on it close to the switch-type Hall sensor H, the switch-type Hall sensor H will output a high level. When the rotation continues to drive the magnet block away from the switch-type Hall sensor H, the switch-type Hall sensor H will output a low level. The main control module receives the high and low level signals through the OUT terminal and uses a timer to calculate the time of a pulse period, thereby measuring the speed of the rotary table.

[0028] The valve opening control module includes a plurality of opening adjustment components and a plurality of opening detection components. The opening adjustment components include a signal control circuit and a motor connected to the signal control circuit. The signal control circuit is connected to the main control module. The motors are respectively arranged on the valve bodies of the rotary table speed regulating valve 2, the rotary table pilot directional control valve 3, the rotary table torque regulating valve 7, and the anti-torque release valve 8 to control the valve opening.

[0029] The signal control circuit is an analog signal control circuit.

[0030] The main control module outputs a control signal to the motor through the signal control circuit. The motor rotates according to the received control signal, and then drives the valve core to move through the valve stem of the valve, changing the opening degree of the valve. In this embodiment, the reason for selecting the analog signal control circuit is that the main control module can accurately control the rotation speed and rotation angle of the motor by outputting current or voltage signals of different magnitudes, so as to accurately control the valve opening degree and achieve precise control of the hydraulic system of the pressure operation machine.

[0031] That is, the main control module outputs a control signal through the signal control circuit to control the motor, and then drives the valves of the rotary table speed regulating valve 2, the rotary table pilot reversing valve 3, the rotary table torque regulating valve 7, and the anti-torque release valve 8 to rotate through the motor, so as to adjust the rotation speed, rotation direction, and output torque of the rotary table motor 6. And the main control module can correspondingly adjust the opening degrees of the above valves according to the change of the rotary table speed measured by the speed detection circuit to ensure the stability of the rotary table speed.

[0032] The opening degree detection component includes a rotary encoder U3 and a level conversion chip U4 arranged on the valve body of the rotary table speed regulating valve 2, the rotary table pilot reversing valve 3, the rotary table torque regulating valve 7, or the anti-torque release valve 8. Pin 1 of the rotary encoder U3 is connected to resistors R21 and R36 and is also connected to capacitor C11. Capacitor C11 is grounded. Resistor R36 is connected to pin 3 of the level conversion chip U4. Resistor R21 is connected to resistor R22 and is also connected to the VCC_5V terminal. Pins 2, 6, and 7 of the rotary encoder U3 are all grounded. Pin 3 of the rotary encoder U3 is connected to capacitor C13, resistor R37 and is also connected to the other end of resistor R22. Resistor R37 is connected to pin 4 of the level conversion chip U4. Pin 4 of the rotary encoder U3 is connected to capacitor C12 and is grounded. Pin 5 of the rotary encoder U3 is connected to resistors R23 and R38 and is also connected to the other end of capacitor C12. Resistor R23 is connected to the VCC_5V terminal. Resistor R38 is connected to pin 7 of the level conversion chip U4. Pin 1 of the level conversion chip U4 is connected to the VCC_5V terminal. Pins 11, 12, and 13 of the level conversion chip U4 are all grounded. Pins 23 and 24 of the level conversion chip U4 are both connected to the VCC_3.3V terminal.

[0033] Pins 17, 20, and 21 of the level conversion chip U4 are connected to the main control module.

[0034] In this embodiment, the rotary encoder preferably adopts an EC11E18244AU type voltage rotary encoder, and the level conversion chip is preferably an SN74LYC4245APW type chip. The opening detection component is provided with a rotary encoder U3 on the valve body. The rotary encoder U3 is used to measure the rotation angle and rotation direction of the valve shaft of the valve to output corresponding electrical signals. The signals are output from pins 1 and 3 of the rotary encoder U3. When the valve rotates forward and backward, there is a time difference in the change of the output terminal levels of pins 1 and 3 of the rotary encoder U3, whereby the rotation direction of the valve can be judged. And the electrical signals output by the rotary encoder U3 are converted by the level conversion chip U4 and then output to the main control module.

[0035] In summary, when operating in different strata, the main control module outputs control signals through the signal control circuit to control the motor, and then drives the valves of the rotary table speed regulating valve 2, the rotary table pilot reversing valve 3, the rotary table torque regulating valve 7, and the anti-torque release valve 8 through the motor, so as to adjust the rotation speed, rotation direction, and output torque of the rotary table motor 6. That is, the main control module controls the drill bit on the rotary table to perform drilling operations at different speeds according to the hardness of the formation. And during the drilling operation, the main control module real-time detects the rotation speed of the rotary table through the rotation speed detection circuit, then adjusts the opening degrees of the above valves accordingly according to the measured change in the rotation speed of the rotary table, and compares and adjusts the valve opening degree value fed back by the opening detection component with the set value, so that the valve opening degree reaches and remains at the required position, maintaining the stability of the rotary table rotation speed, and avoiding problems such as overheating and increased wear of the drill bit caused by unstable rotation speed, thereby ensuring the downhole drilling efficiency.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic drilling and grinding system for a pressure working machine, comprising a hydraulic pump (1) and a hydraulic circuit connected to the hydraulic pump (1), wherein a rotary motor (6) for driving a drill bit or a drill rod to rotate is arranged on the hydraulic circuit, and characterized in that: The hydraulic circuit is also provided with a drilling and grinding control unit, a torque setting unit, and a speed setting unit. The speed setting unit comprises a speed control module and a reversing control module, the speed control module is connected to the reversing control module, and the reversing control module is connected to the turntable motor (6); The torque setting unit comprises a torque control module and a reverse torque release module, the reverse torque release module is connected to the turntable motor (6), and the torque control module is connected to the speed control module and the reversing control module; The drilling and grinding control unit comprises a main control module, a real-time feedback module and a valve opening control module, the main control module detects the rotation speed of the turntable motor (6) through the real-time feedback module, and the main control module is connected to the rotation speed control module, the reversing control module, the torque control module and the anti-torque release module through the valve opening control module; The main control module releases the torque of the turntable motor (6) through the anti-torque release module according to the speed change detected by the real-time feedback module, and adjusts the direction, speed and torque of the turntable motor (6) through the reversing control module, the speed control module and the torque control module.

2. The automatic drilling and grinding system of the belt pressure working machine according to claim 1 is characterized in that: The speed control module comprises a turntable speed regulating valve (2) and a balancing valve (5) arranged on the hydraulic circuit, and the reversing control module comprises a turntable pilot reversing valve (3) and a turntable hydraulic reversing valve (4) arranged on the hydraulic circuit. The turntable speed regulating valve (2) is connected to the turntable pilot reversing valve (3), the turntable pilot reversing valve (3) is connected to the turntable hydraulic reversing valve (4), the turntable hydraulic reversing valve (4) is connected to the balancing valve (5) and the turntable motor (6), and the balancing valve (5) is connected to the turntable motor (6).

3. The automatic drilling and grinding system of the belt pressure working machine according to claim 2 is characterized in that: The torque control module comprises a turntable torque regulating valve (7) and a torque meter (9), wherein the turntable torque regulating valve (7) is connected to the turntable speed regulating valve (2) and the turntable hydraulic reversing valve (4), and the anti-torque release module comprises an anti-torque release valve (8), wherein the anti-torque release valve (8) and the torque meter (9) are both arranged on a circuit connecting the turntable hydraulic reversing valve (4) and the turntable motor (6).

4. The automatic drilling and grinding system of the belt pressure working machine according to claim 3 is characterized in that: The real-time feedback module comprises a plurality of detection components, the number of which is consistent with the number of turntables on the turntable motor (6), and the detection component comprises a rotation speed detection circuit connected to the main control module.

5. The automatic drilling and grinding system of the belt pressure working machine according to claim 4 is characterized in that: The speed detection circuit includes a switch type Hall sensor H, a transistor Q1 and a magnet block arranged on the turntable. One end of the switch type Hall sensor H is connected to the resistor R1 and connected to the VCC end, the other end of the switch type Hall sensor H is connected to the resistor R2 and connected to the other end of the resistor R1, and the resistor R2 is connected to the base of the transistor Q1; The collector of the transistor Q1 is connected to the resistor R3 and connected to the OUT terminal, the resistor R3 is connected to the VCC terminal, and the emitter of the transistor Q1 is grounded.

6. The automatic drilling and grinding system of the belt pressure working machine according to claim 3 is characterized in that: The valve opening control module comprises a plurality of opening adjustment components and a plurality of opening detection components. The opening adjustment components comprise a signal control circuit and a motor connected to the signal control circuit. The signal control circuit is connected to the main control module. The motors are respectively arranged on the valve bodies of the turntable speed regulating valve (2), the turntable pilot reversing valve (3), the turntable torque regulating valve (7), and the anti-torque release valve (8) for controlling the valve opening.

7. The automatic drilling and grinding system for belt pressure working machine according to claim 6, characterized in that: The signal control circuit is an analog signal control circuit.

8. The automatic drilling and grinding system of the belt pressure working machine according to claim 6, characterized in that: The opening detection component includes a rotary encoder U3 and a level conversion chip U4 arranged on the valve body. Pin 1 of the rotary encoder U3 is connected to resistors R21 and R36 and capacitor C11, the capacitor C11 is grounded, the resistor R36 is connected to pin 3 of the level conversion chip U4, the resistor R21 is connected to resistor R22 and connected to the VCC_5V terminal; Pins 2, 6 and 7 of the rotary encoder U3 are all grounded; Pin 3 of the rotary encoder U3 is connected to capacitor C13, resistor R37 and the other end of resistor R22, and the resistor R37 is connected to pin 4 of the level conversion chip U4; Pin 4 of the rotary encoder U3 is connected to capacitor C12 and grounded; Pin 5 of the rotary encoder U3 is connected to resistors R23 and R38 and connected to the other end of the capacitor C12, the resistor R23 is connected to the VCC_5V terminal, and the resistor R38 is connected to pin 7 of the level conversion chip U4; Pin 1 of the level conversion chip U4 is connected to the VCC_5V terminal, pins 11, 12 and 13 of the level conversion chip U4 are all grounded, and pins 23 and 24 of the level conversion chip U4 are all connected to the VCC_3.3V terminal.

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