Auxiliary oil way control system of carbon fiber short-stroke hydraulic machine

Abstract

The utility model discloses an auxiliary oil way control system of a carbon fiber short-stroke hydraulic machine, which belongs to the technical field of hydraulic machines and comprises an oil supply mechanism and a control mechanism, and the control mechanism is communicated and mounted at one end of the oil supply mechanism. And the oil supply mechanism is used for supplying oil to the carbon fiber short-stroke hydraulic machine. By means of the device, the difficult problem that forming fails due to the fact that a vacuumizing air hole of a forming mold is blocked or an injected resin coating leaks out due to unstable pressure of a mold oil way of some forming molds can be solved through mold oil way control required by mold forming of the carbon fiber short-stroke pressing machine. Meanwhile, pressure and speed adjustment can be independently carried out among multiple paths, continuous oil supply work with stable pressure can be carried out for a long time, and meanwhile the device has the advantages that energy is saved, dynamic response is fast, and oil supply of a mold oil path is prepared at any time.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic presses, and more specifically, to an auxiliary oil circuit control system for a carbon fiber short-stroke hydraulic press. Background Art

[0002] In recent years, the domestic carbon fiber hydraulic press equipment field has entered a period of rapid development again. With the comprehensive development of fields such as automotive lightweight, high-speed rail, aerospace, sports building materials, and the automotive industry in China, the production process of carbon fiber products has become increasingly complex, and the usage methods of production molds have also become more diverse. The update of the production process and molds has also raised higher requirements for the production equipment used for molding. Especially for the use of the upper mold oil circuit on the molding die, with the emergence of more and more new molds, the use of the mold oil circuit is becoming more and more highly customized. Some of the existing mold oil circuits are used to block the air outlet holes of the compressed air or the suction holes of the vacuum system, thereby preventing the unformed raw materials from blocking the holes. Others are used to exert a forced clamping effect on the vacuum seals in the mold to prevent some resin coatings from oozing out when the workpiece is not formed, resulting in molding failure. In order to prevent the unformed raw materials from blocking the holes or the clamping force of the vacuum seals from being insufficient, it is necessary for the mold oil circuit to maintain pressure for a long time, and at the same time, the multiple mold oil circuits can be independently adjusted in pressure and speed. Therefore, it is very important to design and develop a mold oil circuit control system and control method that meet the molding requirements of the carbon fiber short-stroke press. Summary of the Utility Model

[0003] To make up for the above deficiencies, the utility model provides an auxiliary oil circuit control system for a carbon fiber short-stroke hydraulic press, aiming to improve the problem that some of the existing mold oil circuits are used to block the air outlet holes of the compressed air or the suction holes of the vacuum system, thereby preventing the unformed raw materials from blocking the holes, and others are used to exert a forced clamping effect on the vacuum seals in the mold to prevent some resin coatings from oozing out when the workpiece is not formed, resulting in molding failure.

[0004] The utility model is implemented as follows: An auxiliary oil circuit control system for a carbon fiber short-stroke hydraulic press includes an oil supply mechanism and a control mechanism. The control mechanism is connected and installed at one end of the oil supply mechanism. The oil supply mechanism is used to supply oil to the carbon fiber short-stroke hydraulic press, and the control mechanism is used to control the oil supply mechanism.

[0005] In the preferred technical solution of the utility model, the oil supply mechanism includes an oil supply pump and a bladder accumulator. The bladder accumulator is connected and installed at one end of the oil supply pump. There is one oil supply pump and one bladder accumulator each. Through the deformation ability of the bladder accumulator, energy can be efficiently stored and released to meet the instantaneous energy demand of the device. At the same time, it can absorb hydraulic shock and pulsation, protect the device components from damage, and reduce vibration and noise.

[0006] In the preferred technical solution of the present utility model, the control mechanism includes a three-position four-way electromagnetic directional valve and a first proportional pressure reducing valve. The three-position four-way electromagnetic directional valve is installed at the output end of the oil supply pump. The output end of the three-position four-way electromagnetic directional valve is communicated with the bladder accumulator, and the oil circuit pressure is adjusted by the first proportional pressure reducing valve.

[0007] In the preferred technical solution of the present utility model, a bladder accumulator pressure sensor is arranged between the three-position four-way electromagnetic directional valve and the bladder accumulator, and the bladder accumulator is monitored by the bladder accumulator pressure sensor.

[0008] In the preferred technical solution of the present utility model, an electromagnetic ball valve is installed at one end of the three-position four-way electromagnetic directional valve in a communicating manner. The other end of the electromagnetic ball valve is communicated with the bladder accumulator, and the bladder accumulator is controlled by the electromagnetic ball valve.

[0009] In the preferred technical solution of the present utility model, a first proportional direction valve is installed at one end of the first proportional pressure reducing valve in a communicating manner, and the flow rate of the auxiliary oil circuit is adjusted by the first proportional direction valve.

[0010] In the preferred technical solution of the present utility model, a first non-leakage valve is installed at one end of the first proportional direction valve in a communicating manner, and the auxiliary oil circuit is kept under pressure by the first non-leakage valve.

[0011] In the preferred technical solution of the present utility model, a die oil circuit pressure sensor is installed at one end of the first non-leakage valve in a communicating manner, and the auxiliary oil circuit pressure is detected by the die oil circuit pressure sensor.

[0012] In the preferred technical solution of the present utility model, the first proportional pressure reducing valve, the first proportional direction valve, the die oil circuit pressure sensor and the first non-leakage valve are all cooperatively arranged. The number of the first proportional pressure reducing valve, the first proportional direction valve, the die oil circuit pressure sensor and the first non-leakage valve is cooperatively arranged, and one group or more than one group can be set. For example, a second proportional pressure reducing valve, a second proportional direction valve, a second die oil circuit pressure sensor and a second non-leakage valve can be cooperatively arranged and have the same working principle. The oil circuit control system is electrically connected to a PLC for receiving sensor signals and controlling valve actions. When controlling the rapid ejection and retraction of the auxiliary oil circuit, a fuel supply pump driven by a motor is directly used to supply oil to the auxiliary oil circuit. At the same time, the three-position four-way electromagnetic reversing valve is adjusted to make P communicate with A. At this time, the oil will flow from the fuel supply pump to the auxiliary oil circuit system. By performing PID control on the pressure of the first proportional pressure reducing valve in the auxiliary oil circuit and controlling through the first proportional direction valve, the oil can be injected into the die cylinder to control the rapid ejection and retraction actions of the cylinder. At the same time, the pressure and speed can be set in the main control PLC as needed. Since there are different control components between multiple auxiliary oil circuits, they belong to independent control units and can independently adjust and set the pressure and speed. In the speed control part, the PLC reads the position and speed of the die cylinder encoder in real time. By reading the cylinder speed in real time and adjusting the opening of the proportional servo direction valve, the improved PID control formula is , where is the output value of the proportional servo direction valve at the current moment, is the output value of the proportional servo direction valve at the previous moment, is the output value of the proportional servo direction valve at the previous moment, is the proportional gain parameter, is the cycle scan time, is the integral time parameter, is the differential time parameter, is the output value of the proportional servo directional valve at the previous moment. The desired speed value in the PLC is calculated every 50 ms, and the desired speed is accumulated through dynamic control. The real-time proportional servo valve output value is sent as a command to the valve body through the AO module of the PLC. If the auxiliary oil circuit needs to supply oil continuously at a high pressure for a long time, it is not environmentally friendly and economical to always use the oil pump. At the same time, the long-term use of the oil supply pump also affects its service life. In this case, the oil supply of the oil supply pump is switched to the bladder accumulator for oil supply. The three-position four-way electromagnetic reversing valve is adjusted back to the middle position, and at the same time, the electromagnetic ball valve controlling the oil supply of the bladder accumulator is opened, and the oil stored in the bladder accumulator is used for continuous oil supply with a long time, high pressure, and small flow. If during the long-term small-flow continuous oil supply operation of the bladder accumulator, the value of the bladder accumulator pressure sensor is too low and falls out of the normal working range, the three-position four-way electromagnetic reversing valve is changed to P to B, and the motor-driven oil supply pump is used to pressurize the bladder accumulator. Since the auxiliary oil circuit control belongs to an independent control unit, the normal operation of the auxiliary oil circuit system will not be affected during the pressurization process of the bladder accumulator. In the above steps, when the auxiliary oil circuit is continuously working, the PLC of the main control system will continuously collect the value of the die oil circuit pressure sensor of the auxiliary oil circuit pressure through the AI module at high speed and enter the PLC system, and perform real-time pressure comparison and calculation. Finally, the first proportional pressure reducing valve is adjusted and controlled at high speed through the AO module. Since the pressure control is often not a control interval with particularly good linearity, it is necessary to perform partitioned and segmented control. This control method first tries to use open-loop testing to test the actual pressure under different proportional pressure reducing valve output values, and through the derived linear formula , where is the reference output value, is the target pressure value, is the minimum pressure within the segmented interval, is the minimum pressure within the segmented interval corresponding to the actual output value, is the maximum pressure within the segmented interval, is the maximum pressure within the segmented interval corresponding to the actual output value. Then, the reference output value is used as the feedforward value of the feedforward controller of the PID control, , where is the output control value of the proportional pressure reducing valve, is the proportional gain, is the proportional action parameter, is the target pressure, is the integral action time, is the process pressure of the previous cycle, is the integral action time, is the differential delay parameter, is the differential action parameter, is the feedforward coefficient, is the Laplace operator, is the feedforward value calculated by a linear formula, enabling simultaneous PID control of the pressure and servo valve opening control of the flow rate in each auxiliary oil circuit, so that the pressure and flow rate of the auxiliary oil circuit always operate within the range allowed by the appropriate process parameters.

[0013] The beneficial effects of the present utility model are as follows: An auxiliary oil circuit control system for a carbon fiber short-stroke hydraulic press obtained by the above design. When in use, when controlling the rapid ejection and retraction of the auxiliary oil circuit, an oil supply pump driven by a motor is used to supply oil to the auxiliary oil circuit. At the same time, the three-position four-way electromagnetic directional valve is adjusted to make P communicate with A, and the oil fluid enters the oil circuit system from the oil supply pump. Through PID control of the pressure of the first proportional pressure reducing valve in the auxiliary oil circuit and control by the first proportional direction valve, the oil fluid is pumped into the die cylinder to control the rapid ejection and retraction actions of the cylinder. At the same time, the pressure and speed are set in the main control PLC as needed. Since there are different control elements between multiple auxiliary oil circuits, they belong to independent control units and can independently adjust and set the pressure and speed. If the auxiliary oil circuit needs to perform long-term high-pressure continuous oil supply work, the oil supply of the oil supply pump is switched to the bladder accumulator for oil supply. The three-position four-way electromagnetic directional valve is adjusted back to the neutral position, and at the same time, the electromagnetic ball valve controlling the oil supply of the bladder accumulator is opened, and the oil fluid stored in the bladder accumulator is used for long-term, high-pressure, and small-flow continuous oil supply. When the value of the bladder accumulator pressure sensor is too low during the long-term small-flow continuous oil supply work of the bladder accumulator, the three-position four-way electromagnetic directional valve is changed to make P communicate with B, and the oil supply pump driven by the motor is used to supplement the pressure of the bladder accumulator. When the auxiliary oil circuit is continuously working, the PLC of the main control system will continuously collect the values of the die oil circuit pressure sensor of the auxiliary oil circuit pressure through the AI module at high speed and enter the PLC system, and perform pressure comparison calculations in real time. Finally, through the AO module, high-speed real-time adjustment control of the first proportional pressure reducing valve is carried out, enabling multi-group auxiliary PID control of the pressure and servo valve opening control of the flow rate, so that the pressure and flow rate of the auxiliary oil circuit always operate within the range allowed by the appropriate process parameters. This device can solve some difficult problems in the die oil circuit control required for the molding of carbon fiber short-stroke presses, such as the vacuum extraction holes of the molding die being blocked due to unstable pressure in the die oil circuit or the resin coating injected leaking out, etc., resulting in molding failure. At the same time, it can independently adjust the pressure and speed between multiple channels, can perform long-term pressure-stable continuous oil supply work, and has the advantages of energy conservation, fast dynamic response, and being ready to supply oil to the die oil circuit at any time. Description of the Drawings

[0014] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the embodiments. It should be understood that the following attached drawings only show certain embodiments of the present utility model, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related attached drawings can also be obtained based on these attached drawings.

[0015] Figure 1 is a schematic structural diagram of an auxiliary oil circuit control system structure diagram of a carbon fiber short-stroke hydraulic press provided by an embodiment of the present utility model;

[0016] Figure 2 is a schematic structural diagram of a principle block diagram provided by an embodiment of the present utility model;

[0017] Figure 3 is another schematic structural diagram of a principle block diagram provided by an embodiment of the present utility model.

[0018] In the figure: 100, three-position four-way electromagnetic directional valve; 200, bladder accumulator pressure sensor; 300, electromagnetic ball valve; 400, first proportional pressure reducing valve; 410, second proportional pressure reducing valve; 500, first proportional direction valve; 510, second proportional direction valve; 600, die oil circuit pressure sensor; 610, second die oil circuit pressure sensor; 700, first non-leakage valve; 710, second non-leakage valve; 800, oil supply pump; 900, bladder accumulator. Specific embodiments

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0020] Please refer to Figures 1 to 3 , the present utility model provides a technical solution: an auxiliary oil circuit control system for a carbon fiber short-stroke hydraulic press, including an oil supply mechanism and a control mechanism. The control mechanism is connected and installed at one end of the oil supply mechanism. The oil supply mechanism is used for supplying oil to the carbon fiber short-stroke hydraulic press, and the control mechanism is used for controlling the oil supply mechanism.

[0021] In some specific embodiments, the oil supply mechanism includes an oil supply pump 800 and a bladder accumulator 900. The bladder accumulator is connected and installed at one end of the oil supply pump 800. There is one oil supply pump 800 and one bladder accumulator 900. Through the deformation ability of the bladder accumulator 900, energy is efficiently stored and released to meet the instantaneous energy demand of the device. At the same time, it can absorb hydraulic shock and pulsation, protect the device components from damage, and reduce vibration and noise.

[0022] In some specific embodiments, the control mechanism includes a three-position four-way solenoid directional valve 100 and a first proportional pressure reducing valve 400. The three-position four-way solenoid directional valve 100 is installed at the output end of the oil supply pump 800. The output end of the three-position four-way solenoid directional valve 100 is connected to the bladder accumulator 900. The oil circuit pressure is regulated by the first proportional pressure reducing valve 400.

[0023] In some specific embodiments, a bladder accumulator pressure sensor 200 is provided between the three-position four-way solenoid directional valve 100 and the bladder accumulator 900, and the bladder accumulator 900 is monitored through the bladder accumulator pressure sensor 200.

[0024] In some specific embodiments, an electromagnetic ball valve 300 is connected and installed at one end of the three-position four-way solenoid directional valve 100, and the other end of the electromagnetic ball valve 300 is connected to the bladder accumulator 900. The bladder accumulator 900 is controlled through the electromagnetic ball valve 300.

[0025] In some specific embodiments, a first proportional direction valve 500 is connected and installed at one end of the first proportional pressure reducing valve 400, and the flow rate of the auxiliary oil circuit is adjusted through the first proportional direction valve 500.

[0026] In some specific embodiments, a first non-leakage valve 700 is connected and installed at one end of the first proportional direction valve 500, and the first non-leakage valve 700 works to maintain the pressure of the auxiliary oil circuit.

[0027] In some specific embodiments, a die oil circuit pressure sensor 600 is connected and installed at one end of the first non-leakage valve 700, and the auxiliary oil circuit pressure is detected through the die oil circuit pressure sensor 600.

[0028] In some specific embodiments, the first proportional pressure reducing valve 400, the first proportional direction valve 500, the mold oil circuit pressure sensor 600, and the first non-leakage valve 700 are all cooperatively arranged. The quantities of the first proportional pressure reducing valve 400, the first proportional direction valve 500, the mold oil circuit pressure sensor 600, and the first non-leakage valve 700 are cooperatively arranged, and one set or more than one set of multiple sets can be provided. For example, the second proportional pressure reducing valve 410, the second proportional direction valve 510, the second mold oil circuit pressure sensor 610, and the second non-leakage valve 710 can be cooperatively arranged and have the same operating principle. The oil circuit control system is electrically connected to a PLC for receiving sensor signals and controlling the valve actions. When controlling the rapid ejection and retraction of the auxiliary oil circuit, the oil supply pump 800 driven by a motor is directly used to supply oil to the auxiliary oil circuit. At the same time, the three-position four-way electromagnetic reversing valve 100 is adjusted to make P communicate with A. At this time, the oil fluid will flow from the oil supply pump 800 to the auxiliary oil circuit system. By performing PID control on the pressure of the first proportional pressure reducing valve 400 in the auxiliary oil circuit and controlling through the first proportional direction valve 500, the oil fluid can be injected into the mold cylinder to control the rapid ejection and retraction actions of the cylinder. At the same time, the pressure and speed can be set in the main control PLC as needed. Since there are different control components between multiple auxiliary oil circuits, they belong to independent control units and can independently adjust and set the pressure and speed. In the speed control part, the PLC reads the position and speed of the mold cylinder encoder in real time, and adjusts the opening of the proportional servo direction valve according to the real-time read cylinder speed. The improved PID control formula is , where is the output value of the proportional servo direction valve at the current moment, is the output value of the proportional servo direction valve at the previous moment, is the output value of the proportional servo direction valve at the previous moment, is the proportional gain parameter, is the cycle scan time, is the integral time parameter, is the differential time parameter, is the output value of the proportional servo directional valve at the previous moment. The expected speed value in the PLC is calculated every 50 ms, and the expected speed is accumulated through dynamic control. The real-time output value of the proportional servo valve is sent as a command to the valve body through the AO module of the PLC. If the auxiliary oil circuit needs to supply oil continuously at a high pressure for a long time, it is not environmentally friendly and economical to always use the oil pump. At the same time, continuous use of the oil pump 800 also affects its service life. In this case, the oil supply of the oil pump 800 is switched to the oil supply of the bladder accumulator 900. The three-position four-way electromagnetic reversing valve 100 is adjusted back to the middle position, and at the same time, the electromagnetic ball valve 300 that controls the oil supply of the bladder accumulator 900 is opened. The oil stored in the bladder accumulator 900 is used for continuous oil supply with a long time, high pressure, and small flow. If the value of the bladder accumulator pressure sensor 200 is too low during the continuous small-flow oil supply of the bladder accumulator 900 for a long time and falls out of the normal working range, the three-position four-way electromagnetic reversing valve 100 is changed to P to B, and the oil pump 800 driven by the motor is used to replenish the pressure of the bladder accumulator 900. Since the auxiliary oil circuit control belongs to an independent control unit, the normal operation of the auxiliary oil circuit system will not be affected during the pressure replenishment process of the bladder accumulator 900. In the above steps, when the auxiliary oil circuit is continuously working, the PLC of the main control system will collect the value of the die oil circuit pressure sensor 600 of the auxiliary oil circuit pressure in real time through the AI module and enter the PLC system, and perform real-time pressure comparison calculations. Finally, the first proportional pressure reducing valve 400 is adjusted and controlled in real time at a high speed through the AO module. Since the pressure control often does not have a particularly good linear control range, it is necessary to perform partition and segment control. This control method first tries to use open-loop testing to test the actual pressure under different output values of the proportional pressure reducing valve, and through the derived linear formula , where is the reference output value, is the target pressure value, is the minimum pressure within the segmented interval, is the minimum pressure within the segmented interval corresponding to the actual output value, is the maximum pressure within the segmented interval, is the maximum pressure within the segmented interval corresponding to the actual output value. Then, the reference output value is used as the feedforward value of the feedforward controller of the PID control, , where is the output control value of the proportional pressure reducing valve, is the proportional gain, is the proportional action parameter, is the target pressure, is the integral action time, is the process pressure of the previous cycle, is the integral action time, is the differential delay parameter, is the differential action parameter, is the feedforward coefficient, is the Laplace operator, is the feedforward value calculated by a linear formula, enabling simultaneous PID control of the pressure and servo valve opening control of the flow rate in each auxiliary oil circuit, so that the pressure and flow rate of the auxiliary oil circuit always work within the range allowed by the appropriate process parameters.

[0029] Working principle: When in use, when controlling the rapid ejection and retraction of the auxiliary oil circuit, the oil supply pump 800 driven by the motor supplies oil to the auxiliary oil circuit. At the same time, the three-position four-way electromagnetic reversing valve 100 is adjusted to make P communicate with A, and the oil fluid enters the oil circuit system from the oil supply pump 800. Through PID control of the pressure of the first proportional pressure reducing valve 400 in the auxiliary oil circuit and control by the first proportional direction valve 500, the oil fluid is pumped into the die cylinder to control the rapid ejection and retraction actions of the cylinder. At the same time, the pressure and speed are set in the main control PLC as required. Since there are different control components between multiple auxiliary oil circuits, they are independent control units and can independently adjust and set the pressure and speed. If the auxiliary oil circuit needs to perform long-term high-pressure continuous oil supply work, the oil supply of the oil supply pump 800 is switched to the bladder accumulator 900 for oil supply. The three-position four-way electromagnetic reversing valve 100 is adjusted back to the middle position, and at the same time, the electromagnetic ball valve 300 controlling the oil supply of the bladder accumulator 900 is opened. The oil fluid stored in the bladder accumulator 900 is used for long-term, high-pressure, and small-flow continuous oil supply. When the value of the bladder accumulator pressure sensor 200 is too low during the long-term small-flow continuous oil supply work of the bladder accumulator 900, the three-position four-way electromagnetic reversing valve 100 is changed to make P communicate with B, and the oil supply pump 800 driven by the motor is used to replenish the pressure of the bladder accumulator 900. When the auxiliary oil circuit is continuously working, the PLC of the main control system will collect the value of the die oil circuit pressure sensor 600 of the auxiliary oil circuit pressure into the PLC system at high speed through the AI module in real time, and perform real-time pressure comparison and calculation. Finally, the first proportional pressure reducing valve 400 is adjusted and controlled at high speed through the AO module, enabling multiple groups of auxiliaries to perform PID control of the pressure and servo valve opening control of the flow rate, so that the pressure and flow rate of the auxiliary oil circuit always work within the range allowed by the appropriate process parameters.

[0030] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An auxiliary oil circuit control system for a carbon fiber short-stroke hydraulic press, characterized in that, It includes an oil supply mechanism and a control mechanism. The control mechanism is connected and installed at one end of the oil supply mechanism. The oil supply mechanism is used for oil supply work, and the control mechanism is used to control the oil supply mechanism.

2. The auxiliary oil circuit control system of a carbon fiber short-stroke hydraulic press according to claim 1, characterized in that, The oil supply mechanism includes an oil supply pump and a bladder accumulator. The bladder accumulator is connected and installed at one end of the oil supply pump, and there is one oil supply pump and one bladder accumulator respectively.

3. The auxiliary oil circuit control system of a carbon fiber short-stroke hydraulic press according to claim 2, characterized in that, The control mechanism includes a three-position four-way electromagnetic directional valve and a first proportional pressure reducing valve. The three-position four-way electromagnetic directional valve is installed at the output end of the oil supply pump, and the output end of the three-position four-way electromagnetic directional valve is connected to the bladder accumulator.

4. The auxiliary oil circuit control system of a carbon fiber short-stroke hydraulic press according to claim 3, characterized in that A bladder accumulator pressure sensor is arranged between the three-position four-way electromagnetic directional valve and the bladder accumulator.

5. The auxiliary oil circuit control system of a carbon fiber short-stroke hydraulic press according to claim 3, characterized in that, An electromagnetic ball valve is connected and installed at one end of the three-position four-way electromagnetic directional valve, and the other end of the electromagnetic ball valve is connected to the bladder accumulator.

6. The auxiliary oil circuit control system of a carbon fiber short-stroke hydraulic press according to claim 5, characterized in that, A first proportional direction valve is connected and installed at one end of the first proportional pressure reducing valve.

7. The auxiliary oil circuit control system of a carbon fiber short-stroke hydraulic press according to claim 6, characterized in that, A first non-leakage valve is connected and installed at one end of the first proportional direction valve.

8. The auxiliary oil circuit control system of a carbon fiber short-stroke hydraulic press according to claim 7, characterized in that, A die oil circuit pressure sensor is connected and installed at one end of the first non-leakage valve.

9. The auxiliary oil circuit control system of a carbon fiber short-stroke hydraulic press according to claim 8, characterized in that, The first proportional pressure reducing valve, the first proportional direction valve, the die oil circuit pressure sensor and the first non-leakage valve are all cooperatively arranged.

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