Closed-loop fluid pressure feedback and control system

Abstract

The invention relates to the technical field of pneumatic control, in particular to a closed-loop fluid pressure feedback and control system which comprises a pneumatic control module, an air cylinder and a control module, the pneumatic control module comprises an integrated base, a first electromagnetic valve and a second electromagnetic valve, and an air channel set is formed in the integrated base; an air outlet of the first electromagnetic valve is communicated with the air channel group, and an air inlet and an air outlet of the second electromagnetic valve are respectively communicated with the air channel group; two air cylinder communicating holes are formed in the surface of the integrated base; the control module comprises a control circuit board, an MCU main control unit, a pressure sensor and a control unit. The technical problem that in the prior art, the compressed gas inlet amount of the air cylinder cannot be accurately controlled in real time, and consequently the output of the air cylinder cannot be kept in a stable and constant state can be solved, fluid pressure is detected in real time, and the MCU accurately controls the first electromagnetic valve and the second electromagnetic valve, so that the compressed gas inlet amount is adjusted; and through closed-loop adjustment, the fluid pressure is kept stable.

Description

Technical Field

[0001] This invention relates to the field of pneumatic control technology, and in particular to a closed-loop fluid pressure feedback and control system. Background Technology

[0002] In industrial production, cylinders are often used to drive liquids for transporting and supplying liquids, such as adhesives. Before the compressed gas from an external air pump enters the cylinder, it must pass through components such as pressure reducing valves, solenoid valves, and silencers. These components are generally connected to the cylinder through pipes, which can easily lead to air leaks due to the numerous interfaces. Furthermore, the complex air pipeline can result in slow cylinder operation.

[0003] To address the aforementioned technical problems, Chinese invention patent CN204267397U discloses a pneumatic device, including a cylinder, a control integrated module, a solenoid valve, and a quick-release valve. The cylinder includes a cylinder barrel and a push rod, with a first air port and a second air port on the cylinder barrel. The control integrated module includes a central transverse flow channel, a first vertical flow channel, and a second vertical flow channel. The central transverse flow channel includes an air inlet and an air outlet on its top surface. The first vertical flow channel includes a solenoid valve connection port and a cylinder connection port. The second vertical flow channel includes a quick-release valve connection port and a cylinder connection port. The solenoid valve includes a first connection port and a second connection port on its bottom surface, an external air source interface on its side, a first atmospheric air interface, and a second atmospheric air interface. The first connection port corresponds to the air inlet port of the central transverse flow channel, and the second connection port corresponds to the solenoid valve connection port of the first vertical flow channel. Through the control integrated module, the pneumatic device eliminates the need for pipe connections between the solenoid valve, quick-release valve, and cylinder, reducing the possibility of air leakage. Furthermore, the overall structure is compact and has a fast response speed.

[0004] In practical applications, to achieve a constant flow rate for liquid delivery and supply, the output force of the cylinder must be kept stable and constant, meaning the forces on both sides of the piston driving the cylinder must be balanced. However, for a single-piston-rod cylinder, which includes a rod chamber with a piston rod and a rodless chamber without a piston rod, compressed gas is input into the rodless chamber to drive the piston rod outward, and compressed gas is input into the rod chamber to drive the piston rod inward. Due to the presence of a single piston rod, the area of ​​the piston affected by the gas pressure in the rod chamber is smaller than that in the rodless chamber. Therefore, to ensure force balance on both sides of the piston, the pressure of the compressed gas input into the rodless chamber must be different from that input into the rod chamber; that is, the amount of compressed gas input into the cylinder needs to be adjusted in real time according to the direction of piston rod movement. The solenoid valve in the aforementioned pneumatic device can only control the direction of movement of the cylinder push rod by turning it on or off, that is, to realize the reversal of the movement of the cylinder push rod. However, the solenoid valve cannot accurately control the intake of compressed gas in real time, so it cannot guarantee that the output of the cylinder remains stable and constant, which leads to unstable liquid delivery and supply.

[0005] Therefore, it is necessary to provide a technical solution to address the above problems. Summary of the Invention

[0006] This invention provides a closed-loop fluid pressure feedback and control system to address the problems of existing technologies. It solves the technical problem that existing technologies cannot accurately control the compressed gas intake of the cylinder in real time, resulting in the cylinder output not being able to maintain a stable and constant state. Furthermore, by using a pressure sensor to detect the fluid pressure in real time, the MCU main control unit compares the detected pressure with the user-set value and accurately controls the on / off time of the first and second solenoid valves, thereby adjusting the compressed gas intake. Through closed-loop regulation, the system can quickly respond to pressure fluctuations and maintain stable fluid pressure.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] This invention provides a closed-loop fluid pressure feedback and control system, comprising a pneumatic control module, a cylinder, and a control module. The pneumatic control module includes an integrated base, a first solenoid valve, and a second solenoid valve. An air passage group is formed in the integrated base. External compressed gas enters the pneumatic control module through the inlet of the first solenoid valve. The outlet of the first solenoid valve is connected to the air passage group. The inlet and outlet of the second solenoid valve are both connected to the air passage group. Two cylinder connection holes are formed on the surface of the integrated base, each connected to the air passage group. The first solenoid valve controls the amount of compressed gas entering the system, and the second solenoid valve controls the direction of movement of the piston rod of the cylinder. The cylinder is disposed on the surface of the integrated base, and its two ports are connected to the two cylinder connection holes.

[0009] The control module includes a control circuit board, an MCU main control unit mounted on the control circuit board, a pressure sensor electrically connected to the MCU main control unit, and a control unit electrically connected to the MCU main control unit. The control unit is used to set the required fluid pressure value. The first solenoid valve and the second solenoid valve are respectively electrically connected to the MCU main control unit. The pressure sensor is used to detect the fluid pressure.

[0010] Preferably, the control unit is a control knob, which is rotatably mounted on the integrated base.

[0011] Preferably, the control unit is a touch screen mounted on the integrated base.

[0012] The MCU main control unit includes a main control chip U5 and an analog-to-digital converter U1. The analog-to-digital converter U1 is used to convert the analog signal of the pressure sensor into a digital signal and send it to the main control chip U5. The main control chip U5 reads the pressure data converted by the analog-to-digital converter U1 and controls the opening and closing of the first solenoid valve and the second solenoid valve by outputting PWM pulses.

[0013] Preferably, the main control chip U5 is an STM32F103C8T6.

[0014] Preferably, the analog-to-digital converter U1 is model ADS1246.

[0015] The pneumatic control module further includes a mounting base, which is disposed on the integrated base. The first solenoid valve is disposed inside the mounting base or on the surface of the mounting base. The surface of the mounting base is provided with a mounting base air inlet, which is connected to the air inlet of the first solenoid valve. External compressed gas enters the air inlet of the first solenoid valve through the mounting base air inlet.

[0016] The surface of the integrated base is also provided with a first communication hole that communicates with the air passage assembly. The first communication hole is connected to the connecting air passage of the mounting base.

[0017] The second solenoid valve is disposed on the surface of the integrated base, and the surface of the integrated base is also provided with a plurality of second communication holes that communicate with the air passage assembly. The air inlet and air outlet of the second solenoid valve are respectively connected to the air passage assembly through the plurality of second communication holes.

[0018] The integrated base is provided with several exhaust holes on its surface, and the air duct assembly is connected to the atmosphere through these exhaust holes.

[0019] The integrated base has a groove in the middle, and the control circuit board is disposed in the groove; a protective cover is provided on the top of the groove.

[0020] The control module also includes a buzzer mounted on the control circuit board, which is electrically connected to the MCU main control unit.

[0021] The closed-loop fluid pressure feedback and control system also includes a PLC wiring port, which is located on the integrated base and is used for communication connection with an external PLC controller.

[0022] The beneficial effects of this invention are:

[0023] In operation, external compressed gas enters through the inlet of the first solenoid valve. The amount of compressed gas entering is controlled by adjusting the opening time of the first solenoid valve. The compressed gas then enters the air passage group through the outlet of the first solenoid valve, and then enters the inlet of the second solenoid valve through the air passage group. Next, it enters the air passage group through one of the outlets of the second solenoid valve, and then enters one of the cylinder connecting holes through the air passage group, finally entering the rodless or rod chamber of the cylinder. This drives the piston rod in the cylinder to extend outward or retract inward. In actual use, the MCU main control unit controls the energization or de-energization of the first and second solenoid valves according to whether the piston rod needs to extend outward or retract inward. Simultaneously, it controls the opening time of the first solenoid valve, enabling it to precisely control the amount of compressed gas entering the cylinder in real time according to the direction of piston rod movement. This ensures that the piston rod experiences balanced forces on both sides, regardless of whether it extends outward or retracts inward, thus maintaining a stable and constant output force in the cylinder and achieving stable fluid delivery and supply.

[0024] Furthermore, the MCU main control unit reads the fluid pressure value detected by the pressure sensor in real time, compares the detected pressure with the user-set value, calculates the pressure deviation, and outputs a PWM pulse signal based on the deviation value to precisely control the opening and closing of the first and second solenoid valves, thereby adjusting the compressed gas intake. Through the above closed-loop regulation, the system can quickly respond to pressure fluctuations and maintain stable fluid pressure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a closed-loop fluid pressure feedback and control system of the present invention (the first solenoid valve is disposed on the upper surface of the mounting base).

[0026] Figure 2 This is another structural schematic diagram of a closed-loop fluid pressure feedback and control system of the present invention (the first solenoid valve is disposed on the upper surface of the mounting base).

[0027] Figure 3 This is a schematic diagram of a closed-loop fluid pressure feedback and control system of the present invention (the first solenoid valve is installed inside the mounting base).

[0028] Figure 4 This is a schematic diagram of another perspective of a closed-loop fluid pressure feedback and control system of the present invention (the first solenoid valve is disposed inside the mounting base).

[0029] Figure 5 This is a schematic diagram of the pneumatic control module of the present invention (the first solenoid valve is disposed on the upper surface of the mounting base).

[0030] Figure 6This is a schematic diagram of the pneumatic control module (with the first solenoid valve mounted on the upper surface of the mounting base) from another perspective.

[0031] Figure 7 This is a schematic diagram of the pneumatic control module of the present invention (the first solenoid valve is disposed inside the mounting base).

[0032] Figure 8 This is a schematic diagram of the pneumatic control module of the present invention (the first solenoid valve is disposed inside the mounting base) from another perspective.

[0033] Figure 9 This is a circuit diagram of the MCU main control unit of the present invention.

[0034] Figure 10 This is a circuit diagram of the analog-to-digital converter U1 of the present invention.

[0035] Figure 11 This is a circuit diagram of the rotary encoder switch S1 of the present invention.

[0036] Figure 12 This is a circuit diagram of the buzzer of the present invention.

[0037] exist Figures 1 to 12 The reference numerals in the figures include:

[0038] 1-Integrated base; 2-Cylinder; 3-Control circuit board; 5-First solenoid valve; 6-Second solenoid valve; 7-Cylinder connecting hole; 8-Mounting seat; 81-Mounting seat air inlet; 82-Snap-fit ​​groove; 9-Exhaust hole; 10-Control knob; 11-Groove; 12-Protective cover; 13-Gear position indicator; 14-Cylinder mounting hole. Detailed Implementation

[0039] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0040] Example 1

[0041] Embodiment 1 of this application provides a closed-loop fluid pressure feedback and control system, such as... Figures 1 to 12As shown, it includes a pneumatic control module, a cylinder, and a control module. The pneumatic control module includes an integrated base 1, a first solenoid valve 5, and a second solenoid valve 6. An air passage group is provided in the integrated base 1. External compressed gas enters the pneumatic control module through the inlet of the first solenoid valve 5. The outlet of the first solenoid valve 5 is connected to the air passage group. The inlet and outlet of the second solenoid valve 6 are both connected to the air passage group. Two cylinder connection holes 7 are provided on the surface of the integrated base 1, and both cylinder connection holes 7 are connected to the air passage group. The first solenoid valve 5 is used to control the amount of compressed gas entering, and the second solenoid valve 6 is used to control the movement direction of the piston rod of the cylinder. The cylinder is disposed on the surface of the integrated base, and the two air ports of the cylinder are respectively connected to the two cylinder connection holes. The cylinder 2 is detachably connected to the upper surface of the integrated base 1.

[0042] The control module includes a control circuit board 3, an MCU main control unit disposed on the control circuit board, a pressure sensor electrically connected to the MCU main control unit, and a control unit electrically connected to the MCU main control unit. The control unit is used to set the required fluid pressure value. The first solenoid valve 5 and the second solenoid valve 6 are respectively electrically connected to the MCU main control unit. The pressure sensor is used to detect the fluid pressure.

[0043] Specifically, the air passage assembly includes several longitudinal air passages and several transverse air passages disposed in the integrated base 1; the first solenoid valve 5, the second solenoid valve 6, and the cylinder are connected through several longitudinal air passages and several transverse air passages; the first solenoid valve 5 is a two-position two-way valve or a two-position three-way valve, and the control circuit board 3 achieves real-time precise control of the amount of compressed gas entering the pneumatic control module by precisely controlling the opening time of the first solenoid valve 5; the second solenoid valve 6 is a two-position five-way solenoid valve, which includes one air inlet, two forward and reverse action air outlets, and two exhaust ports. The one air inlet and the two air outlets are respectively connected to the air passage assembly, and the two exhaust ports can be directly connected to the atmosphere or connected to the atmosphere through the air passage assembly; the reciprocating motion of the piston rod of the cylinder 2 is achieved by opening and closing the second solenoid valve 6.

[0044] External compressed gas enters through the inlet of the first solenoid valve 5, and the amount of external compressed gas entering is controlled by controlling the opening time of the first solenoid valve 5. The compressed gas then enters the air passage group through the outlet of the first solenoid valve 5, and then enters the inlet of the second solenoid valve 6 through the air passage group. Next, it enters the air passage group through one of the outlets of the second solenoid valve 6, and then enters one of the cylinder connecting holes 7 through the air passage group. Finally, it enters the rodless chamber or rod chamber of the cylinder 2, thereby driving the piston rod in the cylinder 2 to extend outward or retract inward. In actual use, the MCU main control unit controls the first solenoid valve 5 and the second solenoid valve 6 to be energized or de-energized according to whether the piston rod of cylinder 2 needs to extend outward or retract inward. At the same time, it controls the opening time of the first solenoid valve 5, so that the first solenoid valve 5 can accurately control the intake of compressed gas in real time according to the movement direction of the piston rod. This ensures that the piston is balanced on both sides, whether the piston rod extends outward or retracts inward, thereby ensuring that the output of the cylinder remains stable and constant, thus achieving stable fluid delivery and supply.

[0045] Furthermore, in this embodiment, the user can directly set the required fluid pressure value through the touch screen. The analog-to-digital converter U1 is responsible for converting the analog signal from the pressure sensor into a digital signal. The main control chip U5 reads the pressure data converted by the analog-to-digital converter U1, calculates it, and outputs a PWM pulse to control the opening and closing of the first and second solenoid valves, thereby controlling the fluid pressure. The MCU main control unit reads the fluid pressure value detected by the pressure sensor in real time. The MCU main control unit compares the detected pressure with the user-set value, calculates the pressure deviation, and based on the deviation value, the MCU main control unit outputs a PWM pulse signal to precisely control the opening and closing of the first and second solenoid valves, thereby adjusting the compressed gas intake. Through the above closed-loop regulation, the system can quickly respond to pressure fluctuations and maintain stable fluid pressure. Among them, the PWM pulse control of the solenoid valve to achieve precise control by adjusting the width and frequency of the current signal is a common application in the field of PWM pulse control, which will not be elaborated here.

[0046] In this embodiment, the MCU main control unit includes a main control chip U5 and an analog-to-digital converter U1. The analog-to-digital converter U1 converts the analog signal from the pressure sensor into a digital signal and sends it to the main control chip U5. The main control chip U5 reads the pressure data converted by the analog-to-digital converter U1 and controls the opening and closing of the first and second solenoid valves by outputting PWM pulses. Preferably, the main control chip U5 is an STM32F103C8T6. Preferably, the analog-to-digital converter U1 is an ADS1246. Specifically, the pressure sensor continuously detects the fluid pressure and transmits the analog signal to the analog-to-digital converter U1. The analog-to-digital converter U1 converts the analog signal into a digital signal for the MCU main control unit to read in real time. The MCU main control unit compares the detected pressure with the user-set value, calculates the pressure deviation, and outputs a PWM pulse signal based on the deviation value to precisely control the on / off time of the first and second solenoid valves, thereby adjusting the compressed gas intake. Through the above closed-loop regulation, the system can quickly respond to pressure fluctuations and maintain stable fluid pressure. In this embodiment, the piston direction is coordinated with the pressure. The MCU main control unit synchronously controls the second solenoid valve to switch the airflow direction and drive the piston rod to extend or retract. Regardless of whether the piston rod extends or retracts, the MCU main control unit adjusts the intake volume in real time through the first and second solenoid valves to ensure that the forces on both sides of the piston are balanced.

[0047] In this embodiment, the pneumatic control module further includes a mounting base 8, which is disposed on the integrated base 1. The first solenoid valve 5 is disposed inside the mounting base 8 or on the surface of the mounting base 8. The surface of the mounting base 8 has a mounting base air inlet 81, which communicates with the air inlet of the first solenoid valve 5. External compressed gas enters the air inlet of the first solenoid valve 5 through the mounting base air inlet 81. The surface of the integrated base 1 also has a first connecting hole communicating with the air passage assembly, which communicates with the air inlet of the first solenoid valve 5. Specifically, the mounting base 8 is detachably connected to the upper surface of the integrated base 1, and the mounting base 8 is provided with a snap-fit ​​groove 82 for installing an external filter. The air outlet of the filter communicates with the mounting base air inlet 81. Compressed gas from an external air source enters the mounting base air inlet 81 after passing through the filter, and then enters the air inlet of the first solenoid valve 5 through the mounting base air inlet 81.

[0048] In this embodiment, the second solenoid valve 6 is disposed on the surface of the integrated base 1. The surface of the integrated base 1 also has multiple second communication holes communicating with the air passage assembly. The air inlet and outlet of the second solenoid valve 6 are respectively connected to the air passage assembly through the multiple second communication holes. Specifically, the second solenoid valve 6 is detachably connected to the upper surface of the integrated base 1, and the multiple second communication holes are also disposed on the upper surface of the integrated base 1.

[0049] In this embodiment, the surface of the integrated base 1 is further provided with a plurality of exhaust holes 9, and the air passage assembly is connected to the atmosphere through the plurality of exhaust holes 9. Gas flowing out of the cylinder enters the air passage assembly through the exhaust port of the second solenoid valve, then flows from the air passage assembly to the exhaust holes 9, and is discharged into the atmosphere through the exhaust holes 9. A muffler can be installed on the exhaust holes 9 to reduce the noise generated when the gas is discharged.

[0050] In this embodiment, the control unit is a control knob 10, which is rotatably mounted on the integrated base 1. The user can adjust the required fluid pressure value by turning the control knob 10, thereby selecting the cylinder output force through the MCU main control unit, which is convenient and quick. Figure 11 As shown, the control knob 10 can be a manual rotary encoder switch S1.

[0051] Furthermore, a groove 11 is provided in the middle of the integrated base 1, and the control circuit board 3 is disposed in the groove 11. A protective cover plate 12 is provided on the top of the groove 11, and the protective cover plate 12 has a clearance through hole to avoid the control knob 10. The control knob 10 extends to the upper side of the protective cover plate 12 through the clearance through hole. By providing a groove in the integrated base 1 to place the control circuit board 3, the overall structure of the pneumatic control module can be made more compact. The protective cover plate 12 on the top of the groove can effectively protect the control circuit board 3, and the control knob 10 extending to the upper side of the protective cover plate 12 can facilitate user adjustment of the control knob 10.

[0052] Furthermore, the control knob 10 has multiple gear positions, and gear position markings 13, corresponding to each of the multiple gear positions, are provided around the upper surface of the protective cover 12. Specifically, the gear position markings 13 use Arabic numerals; of course, in some other embodiments, the gear position markings 13 can also be Chinese numerals, Roman numerals, etc. By setting the gear position markings 13 and providing pointer lines on the control knob 10, it is convenient for the user to adjust the control knob 10 to the appropriate gear position.

[0053] In actual use, the user adjusts the control knob 10 to the appropriate position according to the required cylinder output. The MCU main control unit controls the opening time of the first solenoid valve 5 according to the position of the control knob 10 and the movement direction of the cylinder piston rod, so that the cylinder output meets the user's needs and the cylinder output remains in a balanced and stable state.

[0054] Example 2

[0055] In Embodiment 2 of this application, the difference from Embodiment 1 is that the control unit is a touch screen display mounted on the integrated base. Specifically, the user can directly set the required fluid pressure value through the touch screen display. The analog-to-digital converter U1 is responsible for converting the analog signal from the pressure sensor into a digital signal. The main control chip U5 reads the pressure data converted by the analog-to-digital converter U1, calculates it, and outputs a PWM pulse to control the opening and closing of the solenoid valve, thereby controlling the fluid pressure.

[0056] Example 3

[0057] In the third embodiment of this application, the control module is further provided with a wireless communication module on the control circuit board. The wireless communication module is electrically connected to the MCU main control unit. The wireless communication module can be used to connect with an external smart terminal, so that users can remotely control and use the embodiment of this application. That is, the control unit can be the external smart terminal, and the required pressure value can be set through the external smart terminal.

[0058] Example 4

[0059] In Embodiment 4 of this application, the control module is further provided with a buzzer on the control circuit board. The buzzer is electrically connected to the MCU main control unit. When a fault occurs or the pressure threshold is too high or too low, the buzzer emits an alarm sound to remind the staff, so as to play a warning role.

[0060] Example 5

[0061] In Embodiment 5 of this application, the closed-loop fluid pressure feedback and control system further includes a PLC wiring port. The PLC wiring port is mounted on the integrated base and is used for communication with an external PLC controller. Specifically, the external PLC controller is connected to the PLC wiring port via a cable, and the PLC wiring port is electrically connected to the MCU main control unit, facilitating the use and control of this embodiment by technicians through the external PLC controller.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present invention without departing from the scope of the present invention are within the scope of the present invention.

Claims

1. A closed-loop fluid pressure feedback and control system, characterized in that: The system includes a pneumatic control module, a cylinder, and a control module. The pneumatic control module comprises an integrated base, a first solenoid valve, and a second solenoid valve. An air passage assembly is provided in the integrated base. External compressed gas enters the pneumatic control module through the inlet of the first solenoid valve. The outlet of the first solenoid valve is connected to the air passage assembly. Both the inlet and outlet of the second solenoid valve are connected to the air passage assembly. Two cylinder connection holes are provided on the surface of the integrated base, each connected to the air passage assembly. The first solenoid valve controls the amount of compressed gas entering the system, and the second solenoid valve controls the direction of movement of the piston rod of the cylinder. The cylinder is disposed on the surface of the integrated base, and its two ports are connected to the two cylinder connection holes. The control module includes a control circuit board, an MCU main control unit mounted on the control circuit board, a pressure sensor electrically connected to the MCU main control unit, and a control unit electrically connected to the MCU main control unit. The control unit is used to set the required fluid pressure value. The first solenoid valve and the second solenoid valve are respectively electrically connected to the MCU main control unit. The pressure sensor is used to detect the fluid pressure.

2. The closed-loop fluid pressure feedback and control system according to claim 1, characterized in that: The control unit is a control knob, which is rotatably mounted on the integrated base.

3. The closed-loop fluid pressure feedback and control system according to claim 1, characterized in that: The control unit is a touch screen mounted on the integrated base.

4. The closed-loop fluid pressure feedback and control system according to claim 1, characterized in that: The MCU main control unit includes a main control chip U5 and an analog-to-digital converter U1. The analog-to-digital converter U1 is used to convert the analog signal of the pressure sensor into a digital signal and send it to the main control chip U5. The main control chip U5 reads the pressure data converted by the analog-to-digital converter U1 and controls the opening and closing of the first solenoid valve and the second solenoid valve by outputting PWM pulses.

5. A closed-loop fluid pressure feedback and control system according to claim 4, characterized in that: The main control chip U5 is model STM32F103C8T6.

6. A closed-loop fluid pressure feedback and control system according to claim 4, characterized in that: The analog-to-digital converter U1 is model ADS1246.

7. A closed-loop fluid pressure feedback and control system according to claim 1, characterized in that: The pneumatic control module also includes a mounting base, which is disposed on the integrated base. The first solenoid valve is disposed inside the mounting base or on the surface of the mounting base. The surface of the mounting base is provided with a mounting base air inlet, which is connected to the air inlet of the first solenoid valve. External compressed gas enters the air inlet of the first solenoid valve through the mounting base air inlet. The surface of the integrated base is also provided with a first communication hole that communicates with the air passage assembly. The first communication hole is connected to the connecting air passage of the mounting base.

8. A closed-loop fluid pressure feedback and control system according to claim 1, characterized in that: The second solenoid valve is disposed on the surface of the integrated base, and the surface of the integrated base is also provided with a plurality of second communication holes that communicate with the air passage assembly. The air inlet and air outlet of the second solenoid valve are respectively connected to the air passage assembly through the plurality of second communication holes.

9. A closed-loop fluid pressure feedback and control system according to claim 1, characterized in that: The control module also includes a buzzer mounted on the control circuit board, which is electrically connected to the MCU main control unit.

10. A closed-loop fluid pressure feedback and control system according to claim 1, characterized in that: The closed-loop fluid pressure feedback and control system also includes a PLC wiring port, which is located on the integrated base and is used for communication connection with an external PLC controller.

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