CN109838424B - High-precision mode locking pressure hydraulic control loop and control method - Google Patents
High-precision mode locking pressure hydraulic control loop and control method Download PDFInfo
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Abstract
The invention provides a high-precision mode locking pressure hydraulic control loop and a control method, wherein the control method comprises the following steps: the device comprises a mode locking oil cylinder, an electronic proportional pressure reducing valve, a first control valve, a booster, a second control valve, a pressure sensor and a controller, wherein the controller receives pressure data signals from the pressure sensor, compares the pressure data with set mode locking pressure, and outputs corresponding voltage control signals to the electronic proportional pressure reducing valve so as to adjust the oil outlet pressure of the electronic proportional pressure reducing valve. Compared with the prior art, the invention adopts the electronic proportional pressure reducing valve, the booster and the pressure sensor to control the loop in a hydraulic way, and in the boosting process, the controller is used for introducing deviation compensation and feedback control, so that the accuracy of the mode locking pressure is 0-0.3MPa, stable mode locking force is provided, and the vulcanization quality of the tire is improved.
Description
Technical Field
The invention relates to a hydraulic control loop, in particular to a high-precision mode locking pressure hydraulic control loop and a control method.
Background
With the rapid development of the tire industry, tire vulcanizers with increasingly high processing precision are more widely used. The accuracy of the mold locking pressure of the hydraulic vulcanizing machine is required to be higher and higher, so that the influence on the deformation of the vulcanizing mold and the vulcanization quality of the tire caused by overpressure or underpressure is avoided. The mode locking pressure hydraulic control loop is simply provided with a proportional pressure reducing valve and a booster or the proportional pressure reducing valve and the booster are used in series, the common proportional pressure reducing valve has larger uncertain pressure deviation, the booster also has uncertain pressure loss, and the mode locking pressure precision can not meet the high precision requirement.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a high-precision mode locking pressure hydraulic control loop and a control method.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: a high precision mode locking pressure hydraulic control circuit comprising:
The mold locking oil cylinder outputs mold locking pressure to the mold;
The oil inlet of the electronic proportional pressure reducing valve is communicated with the oil inlet of the hydraulic control loop, and pressure oil equivalent to the voltage control signal is output at the oil outlet of the electronic proportional pressure reducing valve according to the received voltage control signal;
the first control valve is connected to an oil path between the electronic proportional pressure reducing valve and the mold locking oil cylinder, and an oil inlet of the first control valve is communicated with an oil outlet of the electronic proportional pressure reducing valve and is used for controlling the on-off or flow direction of pressure oil output from the electronic proportional pressure reducing valve and entering the mold locking oil cylinder;
The booster is connected to an oil path between the oil outlet of the electronic proportional pressure reducing valve and the mold locking pressure cavity of the mold locking oil cylinder and is used for providing pressurized pressure oil for the mold locking oil cylinder;
The second control valve is connected to an oil path between the oil outlet of the electronic proportional pressure reducing valve and the supercharger and is used for controlling the on-off of pressure oil output from the electronic proportional pressure reducing valve and entering the supercharger;
The pressure sensor is arranged on an oil way close to the mode locking pressure cavity of the mode locking oil cylinder and used for detecting the mode locking pressure;
And the controller is used for receiving the pressure data signal from the pressure sensor, comparing the pressure data with the set mode locking pressure, and outputting a corresponding voltage control signal to the electronic proportional pressure reducing valve for adjusting the oil outlet pressure of the electronic proportional pressure reducing valve.
Compared with the prior art, the invention adopts the electronic proportional pressure reducing valve, the booster and the pressure sensor to control the loop in a hydraulic way, and in the boosting process, the controller is used for introducing deviation compensation and feedback control, so that the accuracy of the mode locking pressure is 0-0.3MPa, stable mode locking force is provided, and the vulcanization quality of the tire is improved.
Further, the first control valve is a three-position four-way electromagnetic reversing valve, an oil inlet of the three-position four-way electromagnetic reversing valve is communicated with an oil outlet of the electronic proportional pressure reducing valve, an oil outlet of the three-position four-way electromagnetic reversing valve is communicated with an oil return port of the hydraulic control loop, and two working oil ports of the three-position four-way electromagnetic reversing valve are respectively communicated with a mode locking pressure cavity and a rod cavity of the mode locking oil cylinder.
Further, the second control valve is an electromagnetic ball valve, an oil inlet of the electromagnetic ball valve is communicated with an oil outlet of the electronic proportional pressure reducing valve, and an oil outlet of the electromagnetic ball valve is communicated with an oil inlet of the supercharger.
By adopting the preferable scheme, the controller is combined to realize the on-off of each oil way of the hydraulic control loop through the first control valve and the second control valve electromagnet, so as to realize automatic control.
Further, the hydraulic control check valve is connected to an oil path between an oil port of the three-position four-way electromagnetic directional valve A and a mode locking pressure cavity of the mode locking cylinder, and a hydraulic control port of the hydraulic control check valve is connected to an oil path between an oil port of the three-position four-way electromagnetic directional valve B and a rod cavity of the mode locking cylinder.
By adopting the preferable scheme, the stability of the mode locking pressure can be maintained, and the leakage of the oil pressure in the oil way can be prevented.
Further, the hydraulic control system further comprises an overflow valve, wherein an oil inlet of the overflow valve is communicated with a mode locking pressure cavity of the mode locking oil cylinder, and an oil outlet of the overflow valve is communicated with an oil return port of the hydraulic control loop.
By adopting the preferable scheme, the overpressure of the oil pressure in the hydraulic control loop can be prevented, and the oil way is protected.
Further, the number of the mold locking cylinders is 4, and the mold locking cylinders are connected to a hydraulic control circuit in parallel.
By adopting the preferable scheme, the mold locking pressure is uniformly applied to the mold, and the mold locking effect is improved.
A control method of a high-precision mode locking pressure hydraulic control loop adopts the high-precision mode locking pressure hydraulic control loop, and comprises the following steps:
A pre-pressing step, namely closing a second control valve, opening a first control valve, switching on an oil way of a mode locking pressure cavity of the electronic proportional pressure reducing valve and the mode locking oil cylinder, and pre-pressing pressure oil output by the electronic proportional pressure reducing valve to enable the pressure of the mode locking pressure cavity of the mode locking oil cylinder to be pre-pressed to be close to the pressure of an oil inlet of a hydraulic control loop;
A pressurizing step, namely opening a second control valve, starting a pressurizing device, closing a first control valve, outputting pressure oil by an electronic proportional pressure reducing valve, pressurizing by the pressurizing device, and flowing to a mode locking pressure cavity of a mode locking oil cylinder;
a comparison step, namely transmitting the mode locking pressure data detected by the pressure sensor to a controller, and comparing the mode locking pressure data with the set mode locking pressure by the controller, wherein if no difference exists, a voltage control signal of the electronic proportional pressure reducing valve is kept unchanged; if the difference exists, a compensation step is carried out;
And in the compensation step, when the mode locking pressure data detected by the pressure sensor is different from the set mode locking pressure, a recalculated corresponding voltage control signal is output to the electronic proportional pressure reducing valve, and the oil outlet pressure flowing from the electronic proportional pressure reducing valve to the supercharger is regulated.
By adopting the preferable scheme, the mode locking pressure cavity of the mode locking oil cylinder is quickly pre-pressed to be close to the pressure of the oil inlet of the hydraulic control loop, then the mode locking pressure cavity is switched to the pressurizing loop, the electronic proportional pressure reducing valve, the pressurizer and the pressure sensor are used for sensing the hydraulic control loop, and high-precision mode locking pressure control is realized through feedback control of deviation compensation.
Further, before the pre-pressing step, the method further comprises a step of measuring the deviation pressure of the electronic proportional pressure reducing valve: closing the second control valve, opening the first control valve, switching on the oil way of the electronic proportional pressure reducing valve and the mode locking pressure cavity of the mode locking oil cylinder, inputting different voltage values of the voltage regulation range 0-Umax into the electronic proportional pressure reducing valve, calculating the difference between the pressure value detected by the pressure sensor and the theoretical output pressure value of the electronic proportional pressure reducing valve, and taking the maximum difference as the deviation pressure E of the electronic proportional pressure reducing valve.
By adopting the preferable scheme, the deviation pressure E of the electronic proportional pressure reducing valve is determined, and the accuracy of the oil outlet pressure of the electronic proportional pressure reducing valve in the pre-pressing and pressurizing processes is improved.
Further, in the pre-pressing step, a voltage control signal ri= (pr+e) ×umax/Pmax is input to the electronic proportional pressure reducing valve, where Pr is the pressure of the oil inlet of the hydraulic control circuit, E is the deviation pressure of the electronic proportional pressure reducing valve, pmax is the nominal maximum output pressure of the electronic proportional pressure reducing valve, and Umax is the nominal maximum input voltage of the electronic proportional pressure reducing valve.
By adopting the preferable scheme, in the pre-pressing process, the electronic proportional pressure reducing valve keeps reasonable opening, and the pressure of the oil inlet of the hydraulic control loop is ensured to be stably maintained to the mode locking pressure cavity of the mode locking oil cylinder.
Further, in the boosting step and the compensating step, the voltage control signal ri= [ (Pe/i) +e+ (Pe-Po) +0.5 ]. Times.umax/Pmax input to the electronic proportional pressure reducing valve, where Pe is a set mode locking pressure, i is a boosting ratio of the supercharger, E is a deviation pressure of the electronic proportional pressure reducing valve, po is a real-time pressure detected by the pressure sensor, pmax is a nominal maximum output pressure of the electronic proportional pressure reducing valve, and Umax is a nominal maximum input voltage of the electronic proportional pressure reducing valve.
By adopting the preferable scheme, reasonable deviation compensation quantity and feedback coefficient are determined, and finally, the accurate control of the mode locking pressure precision of 0-0.3MPa is realized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a flow chart of one embodiment of the present invention;
fig. 3 is a flow chart of another embodiment of the present invention.
Names of the corresponding parts indicated by numerals and letters in the drawings:
1-a mode locking oil cylinder; 11-a mold locking pressure cavity; 12-a rod cavity; 2-electronic proportional pressure reducing valve; 3-a first control valve; 4-a supercharger; 5-a second control valve; 6-a pressure sensor; 7-a hydraulic control one-way valve; 8-overflow valve; 9-an accumulator; 10-pressure gauge.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a high precision clamping pressure hydraulic control circuit includes: the mold locking cylinder 1 outputs mold locking pressure to the mold; an oil inlet P1 of the electronic proportional pressure reducing valve 2 is communicated with an oil inlet P of a hydraulic control loop, and pressure oil equivalent to a voltage control signal is output at an oil outlet T1 of the electronic proportional pressure reducing valve according to the received voltage control signal; the first control valve 3 is connected to an oil path between the electronic proportional pressure reducing valve 2 and the mold locking oil cylinder 1, and an oil inlet of the first control valve is communicated with an oil outlet T1 of the electronic proportional pressure reducing valve and is used for controlling the on-off or flow direction of pressure oil output from the electronic proportional pressure reducing valve 2 and entering the mold locking oil cylinder 1; the supercharger 4 is connected to an oil path between the oil outlet T2 of the second control valve 5 and the mold locking pressure cavity 11 and is used for providing pressurized pressure oil for the mold locking oil cylinder 1; the second control valve 5 is connected to an oil path between the oil outlet T1 of the electronic proportional pressure reducing valve 2 and the supercharger 4 and is used for controlling the on-off of pressure oil output from the electronic proportional pressure reducing valve 2 and entering the supercharger 4; the pressure sensor 6 is arranged on an oil path close to the mold locking pressure cavity 11 and is used for detecting the size of the mold locking pressure; the controller is used for receiving the pressure data signal from the pressure sensor 6, comparing the pressure data with the set mode locking pressure, and outputting a corresponding voltage control signal to the electronic proportional pressure reducing valve 2 for adjusting the oil outlet pressure of the electronic proportional pressure reducing valve 2.
The beneficial effects of adopting above-mentioned technical scheme are: the electronic proportional pressure reducing valve 2, the booster 4 and the pressure sensor 6 are adopted to form a hydraulic control loop, in the boosting process, deviation compensation is introduced through a controller, feedback control is performed, the accuracy of mode locking pressure is 0-0.3MPa, stable mode locking force is provided, and the tire vulcanization quality is improved.
In other embodiments of the present invention, in fig. 1, the first control valve 3 is a three-position four-way electromagnetic directional valve, an oil inlet P4 of the three-position four-way electromagnetic directional valve is communicated with an oil outlet T1 of the electronic proportional pressure reducing valve 2, an oil outlet T4 of the three-position four-way electromagnetic directional valve is communicated with an oil return port T of the hydraulic control loop, a working oil port a of the three-position four-way electromagnetic directional valve is communicated with the mold locking pressure cavity 11, and a working oil port B is communicated with a rod cavity 12 of the mold locking oil cylinder 1; the second control valve 5 is an electromagnetic ball valve, an oil inlet P2 of the electromagnetic ball valve is communicated with an oil outlet T1 of the electronic proportional pressure reducing valve 2, and the oil outlet T2 of the electromagnetic ball valve is communicated with an oil inlet P3 of the supercharger 4; an oil outlet T3 of the supercharger 4 is communicated with an oil return port T of the hydraulic control loop, and a high-pressure oil port HP of the supercharger 4 is communicated with a mold locking pressure cavity 11; the controller (not shown) may employ a PLC controller. The beneficial effects of adopting above-mentioned technical scheme are: the PLC is combined to realize the on-off of each oil way of the hydraulic control loop through the three-position four-way electromagnetic reversing valve and the electromagnetic ball valve electromagnet, so as to realize automatic control.
In fig. 1, in other embodiments of the present invention, the hydraulic control check valve 7 is further included, where the hydraulic control check valve 7 is connected to an oil path between the working oil port a of the three-position four-way electromagnetic directional valve and the mold locking pressure cavity 11, and the hydraulic control port of the hydraulic control check valve 7 is connected to an oil path between the working oil port B of the three-position four-way electromagnetic directional valve and the rod cavity 12. The beneficial effects of adopting above-mentioned technical scheme are: the stability of the mode locking pressure can be maintained, and the oil pressure leakage in the oil way is prevented.
In fig. 1, in other embodiments of the present invention, the hydraulic control system further includes a relief valve 8, wherein an oil inlet of the relief valve 8 is in communication with the mold locking pressure chamber 11, and an oil outlet of the relief valve 8 is in communication with an oil return port T of the hydraulic control circuit. The beneficial effects of adopting above-mentioned technical scheme are: the hydraulic control circuit can prevent the overpressure of the oil pressure in the hydraulic control circuit and protect the oil way.
In other embodiments of the invention, the number of mold-locking cylinders is 4 and is connected in parallel to the hydraulic control circuit. The beneficial effects of adopting above-mentioned technical scheme are: the mode locking pressure is evenly applied to the die, and the mode locking effect is improved.
In fig. 1, in other embodiments of the present invention, an accumulator 9 and a pressure gauge 10 are further installed in the oil passage to which the pressure sensor 6 is installed. The beneficial effects of adopting above-mentioned technical scheme are: the actual oil pressure in the oil way can be conveniently checked through the pressure gauge 10, so that the deviation pressure of the electronic proportional reducing valve can be conveniently measured manually; the accumulator 9 can buffer pressure fluctuation in the oil way, and accuracy of pressure data of the pressure gauge 10 and the pressure sensor 6 is improved.
As shown in fig. 1-2, a control method of a high-precision mode locking pressure hydraulic control circuit, which adopts the high-precision mode locking pressure hydraulic control circuit, comprises the following steps:
A pre-pressing step, namely closing the second control valve 5, powering on the electromagnet DT1 of the first control valve 3, switching on the oil way of the electronic proportional pressure reducing valve 2 and the mode locking pressure cavity 11, and pre-pressing the pressure oil output by the electronic proportional pressure reducing valve 2 to enable the pressure of the mode locking pressure cavity 11 to be pre-pressed to be close to the pressure of the oil inlet P of the hydraulic control loop;
The step of pressurizing, namely, the electromagnet DT3 of the second control valve 5 is powered on, the pressurizing device 4 is started, the first control valve 3 is closed, and the pressure oil is pressurized through the pressurizing device 4 after being output by the electronic proportional pressure reducing valve 2 and flows to the mode locking pressure cavity 11;
A comparison step, namely transmitting the mode locking pressure data detected by the pressure sensor 6 to a controller, and comparing the mode locking pressure data with the set mode locking pressure by the controller, wherein if no difference exists, the voltage control signal of the electronic proportional pressure reducing valve 2 is kept unchanged; if the difference exists, a compensation step is carried out;
And in the compensation step, when the mode locking pressure data detected by the pressure sensor 6 and the set mode locking pressure are different, a recalculated corresponding voltage control signal is output to the electronic proportional pressure reducing valve 2, and the oil outlet pressure flowing from the electronic proportional pressure reducing valve 2 to the booster 4 is regulated.
The beneficial effects of adopting above-mentioned technical scheme are: the mode locking pressure cavity 11 is quickly pre-pressed to be close to the pressure of the oil inlet P of the hydraulic control loop, then the pressure is switched to the pressure boosting loop, the electronic proportional pressure reducing valve 2, the pressure booster 4 and the pressure sensor 6 form the hydraulic control loop, and the high-precision mode locking pressure control is realized through feedback control of deviation compensation.
In other embodiments of the present invention, as shown in fig. 3, the method further includes a step of measuring the deviation pressure of the electronic proportional pressure reducing valve 2 before the pre-pressing step: closing the second control valve 5, powering on the electromagnet DT1 of the first control valve 3, switching on the oil paths of the electronic proportional pressure reducing valve 2 and the mode locking pressure cavity 11, inputting different voltage values of the voltage regulation range 0-Umax into the electronic proportional pressure reducing valve 2, calculating the difference between the pressure value detected by the pressure sensor 6 and the theoretical output pressure value of the electronic proportional pressure reducing valve 2, and taking the maximum difference as the deviation pressure E of the electronic proportional pressure reducing valve 2. The beneficial effects of adopting above-mentioned technical scheme are: and determining the deviation pressure E of the electronic proportional pressure reducing valve 2, and improving the accuracy of the oil outlet pressure of the electronic proportional pressure reducing valve 2 in the pre-pressing and pressurizing processes.
In other embodiments of the present invention, in the pre-pressing step, the voltage control signal ri= (pr+e) ×umax/Pmax input to the electronic proportional pressure reducing valve 2; pr is the pressure of an oil inlet P of the hydraulic control loop, E is the deviation pressure of the electronic proportional pressure reducing valve 2, pmax is the nominal maximum output pressure of the electronic proportional pressure reducing valve 2, and Umax is the nominal maximum input voltage of the electronic proportional pressure reducing valve 2. The following is combined with specific technical parameters of each component, and the value of a voltage control signal Ri in the pre-pressing step is calculated: and the nominal voltage adjusting range of the electronic proportional pressure reducing valve is 0-10V, the output pressure range is 0-21MPa, the deviation pressure of the electronic proportional pressure reducing valve is 1.0-2.2MPa, and the pressure of the oil inlet P of the hydraulic control loop is 12MPa, so that Ri= (12+2.2) is 10/21=6.8V. The beneficial effects of adopting above-mentioned technical scheme are: in the pre-pressing process, the electronic proportional pressure reducing valve 2 keeps reasonable opening, so that the pressure of the oil inlet P of the hydraulic control circuit is ensured to be stably maintained to the mode locking pressure cavity 11, and the pressure of the mode locking pressure cavity 11 is close to the pressure Pr of the oil inlet P of the hydraulic control circuit.
In other embodiments of the present invention, in the step of boosting and the step of compensating, the voltage control signal ri= [ (Pe/i) +e+ (Pe-Po) ×0.5] Umax/Pmax input to the electronic proportional pressure reducing valve 2; where Pe is the set lock pressure, i is the pressure increasing ratio of the supercharger 4, E is the deviation pressure of the electronic proportional pressure reducing valve 2, and Po is the real-time pressure detected by the pressure sensor 6. The following is combined with specific technical parameters of each component, and the value of the voltage control signal Ri in the pressurizing step is calculated: the nominal voltage regulating range of the electronic proportional pressure reducing valve is 0-10V, the output pressure range is 0-21MPa, the deviation pressure of the electronic proportional pressure reducing valve is 1.0-2.2MPa, the supercharging ratio of the supercharger is 2.1, the set mode locking pressure is 15MPa, the actual measurement value of the pressure sensor is 13MPa, and then Ri= [ (15/2.1) +2.2+ (15-13) ×0.5] ×10/21=4.9V; if the measured value of the pressure sensor is 15.2MPa, ri= [ (15/2.1) +2.2+ (15-15.2) ×0.5] ×10/21=4.4V. The beneficial effects of adopting above-mentioned technical scheme are: reasonable deviation compensation quantity and feedback coefficient are determined, and finally accurate control of the mode locking pressure precision of 0-0.3MPa is realized.
The principle of the hydraulic control system according to the present invention for releasing the clamping pressure is described below with reference to fig. 1: closing the second control valve 5, powering on the electromagnet DT2 of the first control valve 3, switching on an oil way between the electronic proportional pressure reducing valve 2 and the rod cavity 12 of the mode locking cylinder, moving the piston rod of the mode locking cylinder 1 upwards, conducting the hydraulic control port of the hydraulic control one-way valve 7 in a pressure bidirectional way, enabling the pressure oil of the mode locking pressure cavity 11 to flow to the working oil port A of the first control valve 3 through the hydraulic control one-way valve 7, then flow to the oil outlet T4, and finally flow back to the oil return port T of the hydraulic control loop, so as to realize unloading of the mode locking pressure.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. A high precision mode locking pressure hydraulic control circuit, comprising:
The mold locking oil cylinder outputs mold locking pressure to the mold;
The oil inlet of the electronic proportional pressure reducing valve is communicated with the oil inlet of the hydraulic control loop, and pressure oil equivalent to the voltage control signal is output at the oil outlet of the electronic proportional pressure reducing valve according to the received voltage control signal;
the first control valve is connected to an oil path between the electronic proportional pressure reducing valve and the mold locking oil cylinder, and an oil inlet of the first control valve is communicated with an oil outlet of the electronic proportional pressure reducing valve and is used for controlling the on-off or flow direction of pressure oil output from the electronic proportional pressure reducing valve and entering the mold locking oil cylinder;
The booster is connected to an oil path between the oil outlet of the electronic proportional pressure reducing valve and the mold locking pressure cavity of the mold locking oil cylinder and is used for providing pressurized pressure oil for the mold locking oil cylinder;
The second control valve is connected to an oil path between the oil outlet of the electronic proportional pressure reducing valve and the supercharger and is used for controlling the on-off of pressure oil output from the electronic proportional pressure reducing valve and entering the supercharger;
The pressure sensor is arranged on an oil way close to the mode locking pressure cavity of the mode locking oil cylinder and used for detecting the mode locking pressure;
The controller is used for receiving the pressure data signal from the pressure sensor, comparing the pressure data with the set mode locking pressure, and outputting a corresponding voltage control signal to the electronic proportional pressure reducing valve for adjusting the oil outlet pressure of the electronic proportional pressure reducing valve;
the first control valve is a three-position four-way electromagnetic reversing valve, an oil inlet of the three-position four-way electromagnetic reversing valve is communicated with an oil outlet of the electronic proportional pressure reducing valve, an oil outlet of the three-position four-way electromagnetic reversing valve is communicated with an oil return port of the hydraulic control loop, and two working oil ports of the three-position four-way electromagnetic reversing valve are respectively communicated with a mold locking pressure cavity and a rod cavity of the mold locking oil cylinder;
the number of the mold locking cylinders is 4, and the mold locking cylinders are connected in parallel on a hydraulic control loop.
2. The high-precision mode locking pressure hydraulic control circuit according to claim 1, wherein the second control valve is an electromagnetic ball valve, an oil inlet of the electromagnetic ball valve is communicated with an oil outlet of the electronic proportional pressure reducing valve, and an oil outlet of the electromagnetic ball valve is communicated with an oil inlet of the supercharger.
3. The high-precision mold locking pressure hydraulic control loop according to claim 2, further comprising a hydraulic control one-way valve, wherein the hydraulic control one-way valve is connected to an oil path between an oil port of the three-position four-way electromagnetic directional valve A and a mold locking pressure cavity of the mold locking cylinder, and a hydraulic control port of the hydraulic control one-way valve is connected to an oil path between an oil port of the three-position four-way electromagnetic directional valve B and a rod cavity of the mold locking cylinder.
4. The high precision clamping pressure hydraulic control circuit of claim 1, further comprising an overflow valve, wherein an oil inlet of the overflow valve is communicated with the clamping cylinder clamping pressure cavity, and an oil outlet of the overflow valve is communicated with an oil return port of the hydraulic control circuit.
5. A control method of a high-precision mode locking pressure hydraulic control circuit, characterized in that the high-precision mode locking pressure hydraulic control circuit according to any one of claims 1 to 4 is adopted, comprising the steps of:
A pre-pressing step, namely closing a second control valve, opening a first control valve, switching on an oil way of a mode locking pressure cavity of the electronic proportional pressure reducing valve and the mode locking oil cylinder, and pre-pressing pressure oil output by the electronic proportional pressure reducing valve to enable the pressure of the mode locking pressure cavity of the mode locking oil cylinder to be pre-pressed to be close to the pressure of an oil inlet of a hydraulic control loop;
A pressurizing step, namely opening a second control valve, starting a pressurizing device, closing a first control valve, outputting pressure oil by an electronic proportional pressure reducing valve, pressurizing by the pressurizing device, and flowing to a mode locking pressure cavity of a mode locking oil cylinder;
a comparison step, namely transmitting the mode locking pressure data detected by the pressure sensor to a controller, and comparing the mode locking pressure data with the set mode locking pressure by the controller, wherein if no difference exists, a voltage control signal of the electronic proportional pressure reducing valve is kept unchanged; if the difference exists, a compensation step is carried out;
And in the compensation step, when the mode locking pressure data detected by the pressure sensor is different from the set mode locking pressure, a recalculated corresponding voltage control signal is output to the electronic proportional pressure reducing valve, and the oil outlet pressure flowing from the electronic proportional pressure reducing valve to the supercharger is regulated.
6. The method for controlling a high-precision mode locking pressure hydraulic control circuit according to claim 5, further comprising the step of measuring deviation pressure of the electronic proportional pressure reducing valve before the pre-pressing step, wherein the step of closing the second control valve, opening the first control valve, switching on the oil paths of the electronic proportional pressure reducing valve and the mode locking pressure cavity of the mode locking cylinder, inputting different voltage values of the voltage regulation range 0-Umax into the electronic proportional pressure reducing valve, calculating the difference between the pressure value detected by the pressure sensor and the theoretical output pressure value of the electronic proportional pressure reducing valve, and taking the maximum difference as the deviation pressure E of the electronic proportional pressure reducing valve.
7. The control method of a high-precision mode locking pressure hydraulic control circuit according to claim 6, wherein in the pre-pressing step, a voltage control signal ri= (pr+e) ×umax/Pmax input to the electronic proportional pressure reducing valve; pr is the pressure of an oil inlet of the hydraulic control loop, E is the deviation pressure of the electronic proportional pressure reducing valve, pmax is the nominal maximum output pressure of the electronic proportional pressure reducing valve, and Umax is the nominal maximum input voltage of the electronic proportional pressure reducing valve.
8. The control method of the high-precision mode-locking pressure hydraulic control circuit according to claim 7, wherein in the step of pressurizing and the step of compensating, a voltage control signal ri= [ (Pe/i) +e+ (Pe-Po) +0.5 ] Umax/Pmax input to the electronic proportional pressure reducing valve is set, where Pe is a set mode-locking pressure, i is a pressurizing ratio of the pressurizing unit, E is a deviation pressure of the electronic proportional pressure reducing valve, po is a real-time pressure detected by the pressure sensor, pmax is a nominal maximum output pressure of the electronic proportional pressure reducing valve, and Umax is a nominal maximum input voltage of the electronic proportional pressure reducing valve.
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