Autonomous calibration device and calibration and regulation control method of electric hydraulic regulating valve
Through the integrated electro-hydraulic actuator and control circuit board controlled by a microcontroller, automatic calibration is achieved, which solves the problems of low calibration efficiency and poor accuracy of the electro-hydraulic regulating valve, reducing costs and improving system stability.
Patent Information
- Application Number
- CN202411329951.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2024-12-06
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the calibration process of the electro-hydraulic regulating valve is low and has poor accuracy, and the manual calibration efficiency is low. Using equipment calibration requires a large amount of equipment and human resources, especially when the user is on-site calibration is difficult.
The electro-hydraulic actuator controlled by integrated microcontroller is adopted, combined with the control circuit board of autonomous calibration switch, linear potentiometer and indicator light to realize the automatic calibration function. Through the real-time connection between the potentiometer slide table and the potentiometer, the resistance value is calculated and the valve is automatically adjusted. Plug position to ensure accurate calibration.
It improves calibration efficiency and accuracy, reduces equipment and labor costs, reduces human error and abnormal situations, and enhances system stability and reliability.
Smart Images
Figure CN119084660A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electric hydraulic valve calibration, and in particular to an autonomous calibration device, a calibration and regulation control method of an electric hydraulic regulating valve. Background Art
[0002] After the linear stroke regulating valve body and actuator are assembled, stroke calibration is usually required to ensure that the valve can operate accurately within its stroke range. This process at least includes calibrating the initial position and full stroke position of the valve body to ensure the stroke and adjustment accuracy of the valve. However, there are still many occasions where manual calibration or special equipment is used for calibration. Manual calibration is not only inefficient, but also has poor accuracy; while the use of equipment calibration can improve accuracy, it requires a large investment in equipment funds and consumes a lot of manpower and material resources. Especially when the valve stroke calibration is realized at the user's site, the calibration becomes more difficult due to the lack of suitable tools and environmental conditions.
[0003] Therefore, in order to realize the autonomous calibration of linear travel regulating valves equipped with electric hydraulic actuators, improve production efficiency and reduce costs, an autonomous calibration device, calibration and regulation control method of electric hydraulic regulating valves are proposed, and an automatic regulation control method is also proposed. Summary of the invention
[0004] The purpose of the present invention is to provide an autonomous calibration device, calibration and adjustment control method for an electric hydraulic regulating valve, so as to solve the problems in the above-mentioned background technology that manual calibration is inefficient and has poor accuracy, and that the use of equipment calibration requires a large investment in equipment funds, wasting a lot of manpower and material resources.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an autonomous calibration device, calibration and regulation control method of an electric hydraulic regulating valve, wherein the autonomous calibration device of the electric hydraulic regulating valve comprises an electric hydraulic actuator, a valve body assembly and a control circuit board, wherein a single-chip microcomputer-controlled electromagnetic pump and an electromagnetic one-way valve are integrated in the electric hydraulic actuator, wherein the valve body assembly comprises a valve body, a valve seat, a valve plug and a valve plug boss, wherein the valve plug is connected to the telescopic end of the electric hydraulic actuator, wherein the electric hydraulic actuator controls the up and down movement of the valve plug, wherein the control circuit board is communicatively connected with the single-chip microcomputer-controlled electromagnetic pump and the electromagnetic one-way valve to realize the automatic calibration function of the hydraulic system, wherein the control circuit board comprises a single-chip microcomputer, an autonomous calibration switch, a linear potentiometer, a potentiometer slide and an indicator light, wherein the linear potentiometer is connected to the single-chip microcomputer, wherein the single-chip microcomputer can directly read the value of the potentiometer, and wherein the indicator light and the switch are both arranged on the interface of the single-chip microcomputer; As a further preferred embodiment of the technical solution: the electro-hydraulic actuator is connected to the potentiometer slide via a connector, and the real-time stroke of the control valve plug by the electro-hydraulic actuator is consistent with the real-time stroke of the potentiometer slide and the linear potentiometer; As a further preferred embodiment of the technical solution: the control circuit board is mounted on the electro-hydraulic actuator, the control circuit board and the electro-hydraulic actuator are detachably mounted, the valve seat cooperates with the valve plug boss to achieve the closure and connection of the valve path, and when the valve plug is in the initial position, the valve plug boss is tightly fitted with the valve seat to achieve the tight closure of the valve path; As a further preferred embodiment of the technical solution: the linear potentiometer is provided with two terminals A and B, and two terminals C, wherein A and B are two fixed ends of the linear potentiometer, and C is a sliding end, and two contacts C1 and C2 are led out from C; As a further preferred embodiment of the present technical solution: the wiring method of the present solution is: Connect the two fixed ends A and B to two points in the circuit, and connect the sliding end C to the circuit node that needs to be adjusted. By adjusting the position of the sliding end of the linear potentiometer, the resistance value in the circuit can be changed. With this connection method, the resistance between the two terminals A and B is the rated resistance of the potentiometer, and the rated resistance is defined as a; The resistance value at any position between A and C2 is the first resistance value of the potentiometer, and the first resistance value is defined as b; The resistance value at any position between B and C1 is the second resistance value of the potentiometer, and the second resistance value is defined as c; the distance between the zero resistance value and the rated resistance value is L, and the value L of the actuator is recorded in the single-chip computer program; Among them, a, b, and c are all real-time reading values; As a further preferred embodiment of the present technical solution: the calculation method of the first resistance value and the second resistance value corresponding to the rated stroke is as follows: When the valve plug is in the initial position, the first resistance between A and C2 is a first initial resistance, and the first initial resistance is defined as b0; the second resistance between B and C1 is a second initial resistance, and the second initial resistance is defined as c0; When the valve plug is in the rated stroke position state, the first resistance between A and C2 is the first rated resistance, and the first rated resistance is defined as b1; the second resistance between B and C1 is the second rated resistance, and the second rated resistance is defined as c1; As the valve plug moves downward, the resistance value b gradually increases and the resistance value c gradually decreases; theoretically, b0+c0=a, b1+c1=a The resistance of the potentiometer has been linearly corrected to achieve better linearity; The value of the first resistance b1 corresponding to the rated stroke position can be calculated based on the above parameters: b1 b0 Where SL is the rated position, and the value of the second resistance c1 corresponding to the rated stroke position is: c1 b0; As a further preferred embodiment of the present technical solution: the calibration process is as follows: S1. Connect the valve body and the electric hydraulic actuator, and connect the power supply; S2, turn on the self-calibration switch; S3, the system automatically starts self-calibration, the valve is reset to the initial position, and the initial position resistance values b0 and c0 are stored in the single chip microcomputer; S4, the system controls the actuator to move the rated stroke distance so that the valve plug reaches the rated stroke position, that is, the position corresponding to the resistance values b1 and c1 calculated by the above formula, and stores the values of b1 and c1 in the single chip microcomputer; S5, calibration completed; When the valve is working, the position of the valve plug is adjusted in real time according to the external setting signal. The signal is an analog signal, which can be 0~10V or 4~20mA. It can be set through the LCD screen or the DIP switch. After adding relevant modules, the signal can also support digital signals. The following calculation takes 0~10V as an example The value of the external setting voltage signal is defined as SV, the first resistance value of the target position corresponding to SV is defined as bSV, and the second resistance value of the target position corresponding to SV is defined as cSV. Then bSV= ; cSV= ; In any case: bSV+cSV= + = = = ; As a further preferred embodiment of the present technical solution, the working process has the following two schemes: Solution 1: Using bSV as the control target: When receiving an external given signal SV, the MCU automatically calculates the resistance value bSV corresponding to the signal and compares it with the real-time resistance value b of the potentiometer. When the value of bSV is greater than b, the single chip microcomputer controls the electromagnetic pump to start and the electromagnetic one-way valve is closed. At this time, the electric hydraulic actuator moves downward and the value of b gradually approaches the value of bSV. When the value of bSV is equal to b, the microcontroller controls the electromagnetic pump to stop and the electromagnetic one-way valve to close. At this time, the electric hydraulic actuator maintains the current position and the value of b remains equal to the value of bSV. When the value of bSV is less than b, the single chip microcomputer controls the electromagnetic pump to stop and the electromagnetic one-way valve to open. At this time, the electric hydraulic actuator is reset and the value of b gradually approaches the value of bSV. Option 2: Using cSV as the control target: When receiving an external given signal SV, the MCU automatically calculates the resistance value cSV corresponding to the signal and compares it with the real-time resistance value c of the potentiometer. When the value of cSV is less than c, the microcontroller controls the electromagnetic pump to start and the electromagnetic one-way valve to close. At this time, the electric hydraulic actuator moves downward and the value of c gradually approaches the value of cSV. When the value of cSV is equal to c, the microcontroller controls the electromagnetic pump to stop and the electromagnetic one-way valve to close. At this time, the electric hydraulic actuator maintains the current position and the value of c remains equal to the value of bSV. When the value of cSV is greater than c, the single chip microcomputer controls the electromagnetic pump to stop and the electromagnetic one-way valve to open. At this time, the electric hydraulic actuator is reset and the value of c gradually approaches the value of cSV. As a further preferred embodiment of the present technical solution: the indicator light control logic is as follows: G1, when in calibration state, the indicator light flashes green; G2, according to the valve structure and experience data, the b0 value of the same type of actuator is generally in a relatively concentrated range. When the current position resistance value b cannot reach b0 within the specified time during the valve reset to the initial position during the calibration process and the difference is large, the system determines that the autonomous calibration has failed, and the indicator light is always red; G3, during the calibration process or during the working process, when the current position resistance value b+c≠a and the difference is large, the system determines that the linear potentiometer is faulty and the indicator light is always red; G4, during the calibration process or the working process, when the value of bSV is not equal to b for a long time and the difference is large, it is judged that the valve is faulty and the indicator light flashes red; G5, when operating normally, the indicator light is solid green.
[0006] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes the automatic calibration function of the hydraulic system by adopting an electric hydraulic actuator with an integrated single chip microcomputer to control an electromagnetic pump and an electromagnetic one-way valve, combined with a control circuit board with an autonomous calibration switch, a linear potentiometer, a potentiometer slide and an indicator light, effectively solving the problems of low efficiency and poor accuracy of the existing manual calibration, and also avoiding the capital and labor costs required for calibration using special equipment; 2. The electric hydraulic regulating valve self-calibration device of the present invention adopts advanced single-chip microcomputer control technology, and can realize self-calibration through simple operation after power-on, which greatly improves the calibration efficiency. Compared with the traditional manual calibration, the present invention not only saves a lot of time, but also reduces the uncertainty and error caused by manual operation; 3. By integrating a single-chip microcomputer to control the electromagnetic pump and the electromagnetic one-way valve, the present invention can accurately control the action of the hydraulic system, thereby ensuring that the position of the valve is accurate during calibration. The introduction of the linear potentiometer further enhances the accuracy of position detection, thereby greatly improving the stroke and adjustment accuracy of the valve; 4. Compared with the traditional calibration method, the present invention reduces the demand for professional equipment, thereby effectively reducing the initial investment cost of the enterprise. At the same time, due to its simple operation, it reduces the dependence on human resources, which helps the enterprise to reduce operating costs in the long term; 5. The present invention utilizes a linear potentiometer to provide real-time feedback of the valve position information. By communicating with the single-chip microcomputer, it can promptly detect and handle abnormal situations, thereby improving the stability and reliability of the system. In addition, the design of the autonomous calibration switch makes the calibration process more automated, reducing the possibility of human error. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is a structural schematic diagram of the self-calibration device of the electric hydraulic regulating valve of the present invention when the valve plug is in the initial position; Figure 2 It is a structural schematic diagram of the self-calibration device of the electric hydraulic regulating valve of the present invention when the valve plug is at the rated stroke position; Figure 3 A schematic diagram of the structure of the circuit board assembly.
[0008] In the figure: 1. Electric hydraulic actuator; 2. Valve body; 3. Valve seat; 4. Valve plug; 5. Valve plug boss; 6. Connector; 7. Potentiometer slide; 8. Linear potentiometer; 101. Single chip microcomputer controlled electromagnetic pump; 102. Electromagnetic check valve. DETAILED DESCRIPTION
[0009] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0010] Example See also Figure 1-Figure 3 As shown, the present invention provides a technical solution: an autonomous calibration device, calibration and regulation control method of an electric hydraulic regulating valve, the autonomous calibration device of the electric hydraulic regulating valve comprises an electric hydraulic actuator 1, a valve body assembly and a control circuit board, the electric hydraulic actuator 1 is integrated with a single-chip microcomputer-controlled electromagnetic pump 101 and an electromagnetic one-way valve 102, the valve body assembly comprises a valve body 2, a valve seat 3, a valve plug 4 and a valve plug boss 5, the valve plug 4 is connected to the telescopic end of the electric hydraulic actuator 1, the electric hydraulic actuator 1 controls the up and down movement of the valve plug 4, the control circuit board is communicatively connected with the single-chip microcomputer-controlled electromagnetic pump 101 and the electromagnetic one-way valve 102 to realize the automatic calibration function of the hydraulic system, the control circuit board comprises a single-chip microcomputer, an autonomous calibration switch, a linear potentiometer 8, a potentiometer slide 7 and an indicator light, the linear potentiometer 8 is connected to the single-chip microcomputer, the single-chip microcomputer can directly read the resistance value data of the linear potentiometer 8, and the indicator light and the switch are both arranged on the interface of the single-chip microcomputer.
[0011] In this embodiment, specifically: the electric hydraulic actuator 1 is connected to the potentiometer slide 7 through the connector 6, the electric hydraulic actuator 1 controls the real-time stroke of the valve plug 4 and the real-time travel of the potentiometer slide 7 and the linear potentiometer 8 to be consistent, and the potentiometer slide 7 is used to adjust the position of the linear potentiometer 8, thereby changing the resistance value.
[0012] In this embodiment, specifically: the control circuit board is installed on the electric hydraulic actuator 1, the control circuit board and the electric hydraulic actuator 1 are detachably installed, the valve seat 3 cooperates with the valve plug boss 5 to achieve the closure and connection of the valve circuit, and when the valve plug 4 is in the initial position, the valve plug boss 5 fits tightly with the valve seat 3 to achieve tight closure of the valve circuit.
[0013] In this embodiment, specifically: the linear potentiometer 8 is respectively provided with two terminals A, B, and two terminals C, wherein A and B are two fixed ends of the linear potentiometer 8, and C is a sliding end, from which two contacts C1 and C2 are led out.
[0014] In this embodiment, specifically: the wiring method of this solution is: Connect the two fixed ends A and B to two points in the circuit, and connect the sliding end C to the circuit node that needs to be adjusted. By adjusting the position of the sliding end of the linear potentiometer 8, the resistance value in the circuit can be changed; With this connection method, the resistance between the two terminals A and B is the rated resistance of the potentiometer, and the rated resistance is defined as a; The resistance value at any position between A and C2 is the first resistance value of the potentiometer, and the first resistance value is defined as b; The resistance value at any position between B and C1 is the second resistance value of the potentiometer, and the second resistance value is defined as c; the distance between the zero resistance value and the rated resistance value is L, and the value L of the actuator is recorded in the microcontroller program; Among them, a, b, and c are all real-time reading values.
[0015] In this embodiment, specifically, the calculation method of the first resistance value and the second resistance value corresponding to a fixed stroke is as follows: When the valve plug 4 is in the initial position, the first resistance between A and C2 is the first initial resistance, which is defined as b0; the second resistance between B and C1 is the second initial resistance, which is defined as c0; When the valve plug 4 is in the rated stroke position state, the first resistance between A and C2 is the first rated resistance, which is defined as b1; the second resistance between B and C1 is the second rated resistance, which is defined as c1; As the valve plug 4 moves downward, the resistance value b gradually increases and the resistance value c gradually decreases; theoretically, b0+c0=a, b1+c1=a The resistance of the potentiometer has been linearly corrected to achieve better linearity; The value of the first resistance b1 corresponding to the rated stroke position can be calculated based on the above parameters: b1 b0 Wherein, SL is the rated stroke; the value of the second resistance c1 corresponding to the rated stroke position is: c1 b0.
[0016] In this embodiment, the specific calibration process is as follows: S1. Connect the valve body and the electric hydraulic actuator, and connect the power supply; S2, turn on the self-calibration switch; S3, the system automatically starts self-calibration, the valve is reset to the initial position, and the initial position resistance values b0 and c0 are stored in the single chip microcomputer; S4, the system controls the actuator to move the rated stroke distance, so that the valve plug 4 reaches the rated stroke position, that is, the position corresponding to the resistance values b1 and c1 calculated by the above formula, and stores the values of b1 and c1 in the single chip microcomputer; S5, calibration completed; When the valve is working, the position of the valve plug 4 is adjusted in real time according to the external setting signal. The signal is an analog signal, which can be 0~10V or 4~20mA. It can be set through the LCD screen or the DIP switch. After adding relevant modules, the signal can also support digital signals. The following calculation takes 0~10V as an example The value of the external setting voltage signal is defined as SV, the first resistance value of the target position corresponding to SV is defined as bSV, and the second resistance value of the target position corresponding to SV is defined as cSV. Then bSV= ; cSV= ; In any case: bSV+cSV= + = = = .
[0017] In this embodiment, specifically, the working process has the following two schemes: Solution 1: Using bSV as the control target: When receiving an external given signal SV, the MCU automatically calculates the resistance value bSV corresponding to the signal and compares it with the real-time resistance value b of the potentiometer. When the value of bSV is greater than b, the single chip microcomputer controls the electromagnetic pump 101 to start, and the electromagnetic one-way valve 102 is closed. At this time, the electric hydraulic actuator moves downward, and the value of b gradually approaches the value of bSV. When the value of bSV is equal to b, the single chip microcomputer controls the electromagnetic pump 101 to stop and the electromagnetic one-way valve 102 to close. At this time, the electric hydraulic actuator maintains the current position and the value of b remains equal to the value of bSV. When the value of bSV is less than b, the single chip microcomputer controls the electromagnetic pump 101 to stop and the electromagnetic one-way valve 102 to open. At this time, the electric hydraulic actuator is reset and the value of b gradually approaches the value of bSV. Option 2: Using cSV as the control target: When receiving an external given signal SV, the MCU automatically calculates the resistance value cSV corresponding to the signal and compares it with the real-time resistance value c of the potentiometer. When the value of cSV is less than c, the single chip microcomputer controls the electromagnetic pump 101 to start, and the electromagnetic check valve 102 is closed. At this time, the electric hydraulic actuator moves downward, and the value of c gradually approaches the value of cSV. When the value of cSV is equal to c, the single chip microcomputer controls the electromagnetic pump 101 to stop and the electromagnetic check valve 102 to close. At this time, the electric hydraulic actuator maintains the current position and the value of c remains equal to the value of bSV. When the value of cSV is greater than c, the single chip microcomputer controls the electromagnetic pump 101 to stop and the electromagnetic one-way valve 102 to open. At this time, the electric hydraulic actuator is reset and the value of c gradually approaches the value of cSV.
[0018] In this embodiment, specifically, the indicator light control logic is as follows: G1, when in calibration state, the indicator light flashes green; G2, according to the valve structure and experience data, the b0 value of the same type of actuator is generally in a relatively concentrated range. When the current position resistance value b cannot reach b0 within the specified time during the valve reset to the initial position during the calibration process and the difference is large, the system determines that the autonomous calibration has failed, and the indicator light is always red; G3, during the calibration process or during the working process, when the current position resistance value b+c≠a and the difference is large, the system determines that the linear potentiometer is faulty and the indicator light is always red; G4, during the calibration process or the working process, when the value of bSV is not equal to b for a long time and the difference is large, it is judged that the valve is faulty and the indicator light flashes red; G5, when operating normally, the indicator light is solid green.
[0019] In this embodiment, specifically: the real-time position of the potentiometer when the valve is working can be fed back to the host computer. The feedback signal is an analog quantity, which can be 0~10V or 4~20mA, and can be set through the LCD screen or the DIP switch; after adding relevant modules, the signal can also support digital quantity signals.
[0020] Take 0~10V as an example for a brief explanation: When the potentiometer real-time resistance is b0, the corresponding feedback signal is 0V; when the potentiometer real-time resistance is b1, the corresponding feedback signal is 10V; for the position feedback signal when the potentiometer is at any position: U= V.
[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An autonomous calibration device, calibration and adjustment control method for an electric hydraulic regulating valve, characterized in that: The self-calibration device of the electric hydraulic regulating valve comprises an electric hydraulic actuator (1), a valve body assembly and a control circuit board. The electric hydraulic actuator (1) is integrated with a single-chip microcomputer-controlled electromagnetic pump (101) and an electromagnetic check valve (102). The valve body assembly comprises a valve body (2), a valve seat (3), a valve plug (4) and a valve plug boss (5). The valve plug (4) is connected to the telescopic end of the electric hydraulic actuator (1). The electric hydraulic actuator (1) controls the up and down movement of the valve plug (4). The control circuit board is communicatively connected with the single-chip microcomputer-controlled electromagnetic pump (101) and the electromagnetic check valve (102) to realize the automatic calibration function of the hydraulic system. The control circuit board comprises a single-chip microcomputer, a self-calibration switch, a linear potentiometer (8), a potentiometer slide (7) and an indicator light. The linear potentiometer (8) is connected to the single-chip microcomputer. The indicator light and the switch are both arranged on the interface of the single-chip microcomputer.
2. The autonomous calibration device for an electric hydraulic regulating valve according to claim 1, characterized in that: The electro-hydraulic actuator (1) is connected to the potentiometer slide (7) via a connector (6); the electro-hydraulic actuator (1) controls the real-time travel of the valve plug (4) to be consistent with the real-time travel of the potentiometer slide (7) and the linear potentiometer (8).
3. The autonomous calibration device for an electric hydraulic regulating valve according to claim 2, characterized in that: The control circuit board is mounted on the electro-hydraulic actuator (1), and the control circuit board and the electro-hydraulic actuator (1) are detachably mounted. The valve seat (3) cooperates with the valve plug boss (5) to achieve closing and connecting the valve path. When the valve plug (4) is in the initial position, the valve plug boss (5) is tightly fitted with the valve seat (3) to achieve tight closure of the valve path.
4. The autonomous calibration device for an electric hydraulic regulating valve according to claim 3, characterized in that: The linear potentiometer (8) is respectively provided with two terminals A and B, and two terminals C, wherein A and B are two fixed ends of the linear potentiometer (8), and C is a sliding end, and two contacts C1 and C2 are led out from C.
5. The calibration and adjustment control method according to claim 1, characterized in that: The wiring method of this solution is: Connect the two fixed ends A and B to two points in the circuit, and connect the sliding end C to the circuit node that needs to be adjusted. By adjusting the position of the sliding end of the linear potentiometer (8), the resistance value in the circuit can be changed; With this connection method, the resistance between the two terminals A and B is the rated resistance of the potentiometer, and the rated resistance is defined as a; The resistance value at any position between A and C2 is the first resistance value of the potentiometer, and the first resistance value is defined as b; The resistance value at any position between B and C1 is the second resistance value of the potentiometer, and the second resistance value is defined as c; the distance between the zero resistance value and the rated resistance value is L, and the value L of the actuator is recorded in the single-chip computer program; Among them, a, b, and c are all real-time reading values.
6. The calibration and adjustment control method according to claim 5, characterized in that: The calculation method of the first resistance value and the second resistance value corresponding to the rated stroke is as follows: When the valve plug (4) is in the initial position, a first resistance between A and C2 is a first initial resistance, and the first initial resistance is defined as b0; a second resistance between B and C1 is a second initial resistance, and the second initial resistance is defined as c0; When the valve plug (4) is in a rated stroke position state, a first resistance between A and C2 is a first rated resistance, and the first rated resistance is defined as b1; a second resistance between B and C1 is a second rated resistance, and the second rated resistance is defined as c1; As the valve plug (4) moves downward, the resistance value b gradually increases and the resistance value c gradually decreases; theoretically, b0+c0=a, b1+c1=a The resistance of the potentiometer has been linearly corrected to achieve better linearity; The value of the first resistance b1 corresponding to the rated stroke position can be calculated based on the above parameters: b1 b0 Among them, SL is the rated stroke; The value of the second resistance c1 corresponding to the rated stroke position: c1 b0.
7. The calibration and adjustment control method according to claim 6, characterized in that: The calibration process is as follows: S1. Connect the valve body and the electric hydraulic actuator, and connect the power supply; S2, turn on the self-calibration switch; S3, the system automatically starts self-calibration, the valve is reset to the initial position, and the initial position resistance values b0 and c0 are stored in the single chip microcomputer; S4, the system controls the actuator to move the rated stroke distance so that the valve plug (4) reaches the rated stroke position, that is, the position corresponding to the resistance values b1 and c1 calculated by the above formula, and stores the values of b1 and c1 in the single chip microcomputer; S5, calibration completed; When the valve is working, the position of the valve plug (4) is adjusted in real time according to the external setting signal. The signal is an analog signal, which can be 0~10V or 4~20mA. It can be set through the LCD screen or the DIP switch. After adding relevant modules, the signal can also support digital signals. The following calculation takes 0~10V as an example The value of the external setting voltage signal is defined as SV, the first resistance value of the target position corresponding to SV is defined as bSV, and the second resistance value of the target position corresponding to SV is defined as cSV. Then bSV= ; cSV= ; In any case: bSV+cSV= + = = = 。 8. The calibration and adjustment control method according to claim 7, characterized in that: There are two working procedures: Solution 1: Using bSV as the control target: When receiving an external given signal SV, the MCU automatically calculates the resistance value bSV corresponding to the signal and compares it with the real-time resistance value b of the potentiometer. When the value of bSV is greater than b, the single chip microcomputer controls the electromagnetic pump (101) to start and the electromagnetic check valve (102) to close. At this time, the electric hydraulic actuator moves downward and the value of b gradually approaches the value of bSV. When the value of bSV is equal to b, the single chip microcomputer controls the electromagnetic pump (101) to stop and the electromagnetic check valve (102) to close. At this time, the electric hydraulic actuator is maintained at the current position and the value of b remains equal to the value of bSV. When the value of bSV is less than b, the single chip microcomputer controls the electromagnetic pump (101) to stop and the electromagnetic check valve (102) to open. At this time, the electric hydraulic actuator is reset and the value of b gradually approaches the value of bSV. Option 2: Using cSV as the control target: When receiving an external given signal SV, the MCU automatically calculates the resistance value cSV corresponding to the signal and compares it with the real-time resistance value c of the potentiometer. When the value of cSV is less than c, the single chip microcomputer controls the electromagnetic pump (101) to start and the electromagnetic check valve (102) to close. At this time, the electric hydraulic actuator moves downward and the value of c gradually approaches the value of cSV. When the value of cSV is equal to c, the single chip microcomputer controls the electromagnetic pump (101) to stop and the electromagnetic check valve (102) to close. At this time, the electric hydraulic actuator is maintained at the current position and the value of c remains equal to the value of bSV. When the value of cSV is greater than c, the single chip microcomputer controls the electromagnetic pump (101) to stop and the electromagnetic check valve (102) to open. At this time, the electric hydraulic actuator is reset and the value of c gradually approaches the value of cSV.
9. The calibration and adjustment control method according to claim 8, characterized in that: The indicator light control logic is as follows: G1, when in calibration state, the indicator light flashes green; G2, according to the valve structure and experience data, the b0 value of the same type of actuator is generally in a relatively concentrated range. When the current position resistance value b cannot reach b0 within the specified time during the valve reset to the initial position during the calibration process and the difference is large, the system determines that the autonomous calibration has failed, and the indicator light is always red; G3, during the calibration process or during the working process, when the current position resistance value b+c≠a and the difference is large, the system determines that the linear potentiometer is faulty and the indicator light is always red; G4, during the calibration process or the working process, when the value of bSV is not equal to b for a long time and the difference is large, it is judged that the valve is faulty and the indicator light flashes red; G5, when operating normally, the indicator light is solid green.