Hydraulic control system of double-pump efficient energy-saving injection molding machine

Abstract

The invention relates to the field of injection molding machines, in particular to a hydraulic control system of a double-pump efficient energy-saving injection molding machine. The power element comprises a servo motor, the servo motor is fixedly connected with a first pump and a second pump through couplings, and oil suction ports of the first pump and the second pump are communicated with the integrated hydraulic oil tank through hydraulic rubber pipes; the control element comprises a first valve group, a second valve group and a third valve group, the first valve group comprises a first one-way valve, a second one-way valve, a first pump overflow valve, a second pump overflow valve, an electromagnetic valve, a first pump pressure gauge and a second pump pressure gauge, the second valve group comprises an ejector pin electromagnetic valve and a core-pulling electromagnetic valve, and the third valve group comprises a mold locking electromagnetic valve; the execution element comprises a mold locking oil cylinder, an ejector pin oil cylinder, a core pulling oil cylinder and an injection action; the auxiliary elements comprise an oil suction filter and a cooler, and the purposes of improving efficiency, reducing energy consumption, reducing oil temperature and simplifying control can be achieved while the whole technological process of the injection molding machine is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding machines, and particularly relates to a double-pump high-efficiency energy-saving injection molding machine hydraulic control system. BACKGROUND

[0002] An injection molding machine is a common plastic processing equipment, and needs to have high production efficiency and low energy consumption. The process flow of an existing injection molding machine includes nozzle advancing, injection, pressure maintaining, pre-plasticizing, nozzle retreating, cooling, mold opening, ejector pin, needle retreating, mold closing, and nozzle advancing circulation.

[0003] For example, the patent with the application number CN201922456236.7 discloses a hydraulic control system for an injection molding machine. However, the hydraulic control system has the following disadvantages: 1) it cannot meet the entire process flow of the injection molding machine; 2) the hydraulic control system is composed of a set of driving system, that is, a servo motor and a single pump. The system can only circulate step by step according to the process flow, and cannot realize synchronous action, which consumes a long time and has high energy consumption. If two sets of driving systems are used, the cost is high, the occupied space is large, and the control is complex. Therefore, there is an urgent need for an injection molding machine hydraulic control system that can meet the entire process flow of the injection molding machine and is high-efficiency and energy-saving. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present application aims to provide a double-pump high-efficiency energy-saving injection molding machine hydraulic control system, which solves the problems existing in the prior art. The hydraulic control system can meet the entire process flow of the injection molding machine, improve the efficiency, reduce the energy consumption, reduce the oil temperature, and simplify the control.

[0006] (II) Technical solutions

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a dual-pump high-efficiency and energy-saving hydraulic control system for an injection molding machine, comprising: an integrated hydraulic oil tank containing hydraulic oil; a power element, the power element comprising a servo motor, the servo motor being fixedly connected to one pump and two pumps through a coupling, the oil suction ports of the one pump and the two pumps being connected to the integrated hydraulic oil tank through a hydraulic hose, the oil outlet of the one pump being provided with a one-pump oil outlet flange, the oil outlet of the two pumps being provided with a two-pump oil outlet flange, the oil outlet of the one pump being provided with a one-pump pressure sensor being provided on the oil outlet flange of the one pump, and the oil outlet flange of the two pumps being provided with a two-pump pressure sensor being provided on the oil outlet flange of the two pumps; a control element, the control element comprising a first valve group, a second valve group and a third valve group, the first valve group comprising a first one-way valve, a second one-way valve, a one-pump overflow valve, a two-pump overflow valve, an electromagnetic valve, a one-pump pressure gauge and a two-pump pressure gauge, the first one-way valve being connected to the one pump to prevent the hydraulic oil from flowing in the opposite direction, the second one-way valve It is connected to the two pumps to prevent the hydraulic oil from flowing backward. The overflow valve of the first pump is installed at the outlet of the first pump to maintain the pressure stability of the first pump. The overflow valve of the second pump is installed at the outlet of the second pump to maintain the pressure stability of the two pumps. The pressure gauge of the first pump and the pressure gauge of the second pump are used to monitor the pressure of the first pump and the second pump respectively, and the pressure is adjusted by the overflow valve of the first pump and the overflow valve of the second pump. The second valve group includes a pin solenoid valve and a core pulling solenoid valve, and the third valve group includes a locking solenoid valve; the actuator includes a locking cylinder, a pin cylinder, a core pulling cylinder and an injection action. The locking cylinder is controlled by the locking solenoid valve, the pin cylinder is controlled by the pin solenoid valve, the core pulling cylinder is controlled by the core pulling solenoid valve, and the injection action is controlled by the solenoid valve; the auxiliary element includes an oil suction filter and a cooler. The oil suction filter is connected to the integrated hydraulic oil tank for filtering impurities in the hydraulic oil, and the cooler is used to cool the hydraulic oil.

[0008] Preferably, the first valve group is provided with a first oil port, a second oil port, a third oil port, a fourth oil port, a fifth oil port and a sixth oil port, the first oil port is connected to the oil outlet flange of the first pump through a hydraulic hose, the second oil port is connected to the oil outlet flange of the second pump through a hydraulic hose, the third oil port is connected to the cooler through a hydraulic hose, the fourth oil port is connected to the T port of the locking solenoid valve, the fifth oil port is connected to the P port of the locking solenoid valve, and the sixth oil port is connected to the P port of the second valve group.

[0009] Preferably, the first one-way valve and the second one-way valve are both configured as cartridge-type one-way valves.

[0010] Preferably, the first pump overflow valve and the second pump overflow valve are both configured as plug-in overflow valves.

[0011] Preferably, the solenoid valve, the ejector solenoid valve, the core-pulling solenoid valve and the mold-locking solenoid valve are all configured as plate-type solenoid valves.

[0012] Preferably, a first in-position detection switch and a second in-position detection switch are installed on the ejector cylinder.

[0013] The preferred hydraulic control method of injection molding process of a double-pump high-efficiency energy-saving injection molding machine is as follows: ① nozzle advancing: the driver gives the speed and pressure instructions to the servo motor EM, the servo motor EM drives the double-pump first pump P1 and the second pump P2, the first pump P1 outputs the flow Q1 through the first check valve Y3 to the fifth oil port 12 to enter the injection valve plate to drive the nozzle to advance, the second pump P2 outputs the flow Q2 to the first valve group 1, since the electromagnetic valve X1 is not electrified, the valve core is in the middle position, A / B is cut off, P is connected to T, the flow Q2 flows to the cooler F2 through the third oil port 10 to circulate and cool the hydraulic oil in the integrated hydraulic oil tank F0; ② injection: the driver gives the speed and pressure instructions to the servo motor EM, the servo motor EM drives the double-pump first pump P1 and the second pump P2, the left electromagnetic iron YV1 of the electromagnetic valve X1 is electrified, P is connected to B, A is connected to T, the second pump P2 outputs the flow Q2 through the check valve Y4, the first pump P1 outputs the flow Q1 through the check valve Y3, Q1 and Q2 are combined to enter the injection valve plate through the fifth oil port 12 to realize the injection action; ③ pressure maintaining: the driver gives the speed and pressure instructions to the servo motor EM, the servo motor EM drives the double-pump first pump P1 and the second pump P2, the electromagnetic valve X1 is not electrified, the valve core is in the middle position, A / B is cut off, P is connected to T, the flow Q2 flows to the cooler F2 through the third oil port 10 to circulate and cool the hydraulic oil in the integrated hydraulic oil tank F0, the flow Q1 passes through the check valve Y3 to enter the injection valve plate through the fifth oil port 12 to realize the injection pressure maintaining action; ④ pre-plasticizing: the driver gives the speed and pressure instructions to the servo motor EM, the servo motor EM drives the double-pump first pump P1 and the second pump P2, the left electromagnetic iron YV1 of the electromagnetic valve X1 is electrified, P is connected to B, A is connected to T, the second pump P2 outputs the flow Q2 through the check valve Y4, the first pump P1 outputs the flow Q1 through the check valve Y3, Q1 and Q2 are combined to enter the pre-plasticizing oil motor through the fifth oil port 12 to realize the pre-plasticizing action; ⑤ nozzle retreating: the driver gives the speed and pressure instructions to the servo motor EM, the servo motor EM drives the double-pump first pump P1 and the second pump P2, the first pump P1 outputs the flow Q1 through the check valve Y3 to enter the injection valve plate through the fifth oil port 12 to drive the nozzle to advance, the second pump P2 outputs the flow Q2 to the first valve group 1, since the electromagnetic valve X1 is not electrified, the valve core is in the middle position, A / B is cut off, P is connected to T, the flow Q2 flows to the cooler F2 through the third oil port 10 to circulate and cool the hydraulic oil in the hydraulic oil tank F0.⑥ Open mold, ejector pin, retreat needle, cooling: the driver gives the speed and pressure command to servo motor EM, servo motor EM drives double pump one pump P1 and two pump P2, wherein one pump P1 output flow Q1 through one-way valve Y3, through the fifth oil port 5 into the mold locking electromagnetic valve X2 P port, the left end of the mold locking electromagnetic valve X2 electromagnetic iron YV7 is electrified, P passes B, A passes T, realize open mold action, at the same time two pump P2 output flow Q2, the right end of electromagnetic valve X1 electromagnetic iron YV2 is electrified, P passes A, B passes T, flow Q2 through the sixth oil port 13 into the P port of the second valve group 2, the right end of the ejector pin electromagnetic valve X3 electromagnetic iron YV4 is electrified, P passes A, B passes T, ejector pin oil cylinder 5 extends, after extending to the position, through the second position detection switch X6 gives the signal, the left end of the ejector pin electromagnetic valve X3 electromagnetic iron YV3 is electrified, P passes B, A passes T, the ejector pin oil cylinder 5 retracts, after retracting to the position, through the first position detection switch X5 gives the signal, electromagnetic valve X1 loses power, the valve core is in the middle position, A / B stops, P passes T, realize the ejector pin oil cylinder 5 one cycle action, flow Q2 through the third oil port 3 to the cooler F2, the hydraulic oil in the integrated hydraulic oil tank F0 is circulated and cooled; ⑦ Mold closing: the driver gives the speed and pressure command to servo motor EM, servo motor EM drives double pump one pump P1 and two pump P2, the left end of electromagnetic valve X1 electromagnetic iron YV1 is electrified, P passes B, A passes T, two pump P2 output flow Q2 through one-way valve Y4, one pump P1 output flow Q1 through one-way valve Y3, Q1 and Q2 flow through the fifth oil port 5 into the P port of the mold locking electromagnetic valve X2, the right end of the mold locking electromagnetic valve X2 electromagnetic iron YV8 is electrified, P passes A, B passes T, realize mold closing action.

[0014] (Three) beneficial effects

[0015] 1. The present application can realize efficiency improvement, energy consumption reduction, oil temperature reduction and control simplification while meeting the entire process flow of the injection molding machine.

[0016] 2. The present application can realize the composite linkage of mold opening, ejector pin, needle retreat and cooling, so that the cycle is shortened and the efficiency is improved under the condition that the entire process flow is unchanged.

[0017] 3. The present application realizes the confluence of one pump and two pump in the process of high speed requirement such as injection, pre-plastic and mold closing, so as to ensure the required speed of injection, pre-plastic and mold closing, and realizes the function of hydraulic oil cooling by two pump in the process of relatively low speed requirement such as nozzle advancing, pressure maintaining and nozzle retreating, so as to greatly improve the cooling effect and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the hydraulic principle schematic diagram of the present application.

[0019] Figure 2The schematic diagram of the power element of the present application.

[0020] Figure 3 The schematic diagram of the first valve group of the present application.

[0021] Figure 4 The schematic diagram of the present application Figure 3 The schematic diagram after changing the angle.

[0022] In the figure: 1-the first valve group, 2-the second valve group, 3-the third valve group, 4-the mold locking oil cylinder, 5-the ejector pin oil cylinder, 6-the core pulling oil cylinder, 7-the injection action, 8-the first oil port, 9-the second oil port, 10-the third oil port, 11-the fourth oil port, 12-the fifth oil port, 13-the sixth oil port, EM-the servo motor, F0-the integrated hydraulic oil tank, F1-the oil suction filter, F2-the cooler, P1-the first pump, P2-the second pump, X1-the electromagnetic valve, X2-the mold locking electromagnetic valve, X3-the ejector pin electromagnetic valve, X4-the core pulling electromagnetic valve, X5-the first to position detection switch, X6-the second to position detection switch, Y1-the second pump overflow valve, Y2-the first pump overflow valve, Y3-the first one-way valve, Y4-the second one-way valve, Y5-the first pump pressure sensor, Y6-the first pump pressure gauge, Y7-the second pump pressure sensor, Y8-the second pump pressure gauge, Y9-the coupling, Y10-the first pump oil outlet flange, Y11-the second pump oil outlet flange. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings of the embodiments of the present application. Figures 1-4 The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings of the embodiments of the present application.

[0024] The application provides a technical scheme: a double pump high-efficiency energy-saving injection molding machine hydraulic control system, comprising: an integrated hydraulic oil tank F0, the integrated hydraulic oil tank F0 contains hydraulic oil; a power element, the power element comprises a servo motor EM, the servo motor EM is fixedly connected with a pump P1 and a pump P2 through a shaft coupling Y9, the oil suction ports of the pump P1 and the pump P2 are communicated with the integrated hydraulic oil tank F0 through hydraulic rubber tubes, the oil outlet of the pump P1 is provided with a pump oil outlet flange Y10, the oil outlet of the pump P2 is provided with a pump oil outlet flange Y11, a pump pressure sensor Y5 is arranged on the pump oil outlet flange Y10, and a pump pressure sensor Y7 is arranged on the pump oil outlet flange Y11; a control element, the control element comprises a first valve group 1, a second valve group 2 and a third valve group 3, the first valve group 1 comprises a first check valve Y3, a second check valve Y4, a pump overflow valve Y2, a pump overflow valve Y1, an electromagnetic valve X1, a pump pressure gauge Y6 and a pump pressure gauge Y8, the first check valve Y3 is connected with the pump P1, and the first check valve Y3 plays a role of preventing the hydraulic oil from flowing in the reverse direction, the second check valve Y4 is connected with the pump P2, and the second check valve Y4 plays a role of preventing the hydraulic oil from flowing in the reverse direction, the pump overflow valve Y2 is arranged at the outlet of the pump P1, and the pump overflow valve Y2 is used for maintaining the pressure of the pump P1 stable, the pump overflow valve Y1 is arranged at the outlet of the pump P2, and the pump overflow valve Y1 is used for maintaining the pressure of the pump P2 stable, the pump pressure gauge Y6 and the pump pressure gauge Y8 are respectively used for monitoring the pressures of the pump P1 and the pump P2, and the pressures are adjusted through the pump overflow valve Y2 and the pump overflow valve Y1, the second valve group 2 comprises a ejector electromagnetic valve X3 and a core pulling electromagnetic valve X4, and the third valve group 3 comprises a mold locking electromagnetic valve X2; an execution element, the execution element comprises a mold locking oil cylinder 4, an ejector oil cylinder 5, a core pulling oil cylinder 6 and an injection action 7, the mold locking oil cylinder 4 is controlled by the mold locking electromagnetic valve X2, the ejector oil cylinder 5 is controlled by the ejector electromagnetic valve X3, the core pulling oil cylinder 6 is controlled by the core pulling electromagnetic valve X4, and the injection action 7 is controlled by the electromagnetic valve X1; an auxiliary element, the auxiliary element comprises an oil suction filter F1 and a cooler F2, the oil suction filter F1 is communicated with the integrated hydraulic oil tank F0 and is used for filtering impurities in the hydraulic oil, and the cooler F2 is used for cooling the hydraulic oil.

[0025] The first valve group 1 is provided with a first oil port 8, a second oil port 9, a third oil port 10, a fourth oil port 11, a fifth oil port 12 and a sixth oil port 13, the first oil port 8 is connected with the pump oil outlet flange Y10 through a hydraulic rubber tube, the second oil port 9 is connected with the pump oil outlet flange Y11 through a hydraulic rubber tube, the third oil port 10 is connected with the cooler F2 through a hydraulic rubber tube, the fourth oil port 11 is connected with the T port of the mold locking electromagnetic valve X2 and the injection T, the fifth oil port 12 is connected with the P port of the mold locking electromagnetic valve X2 and the injection P, and the sixth oil port 13 is connected with the P port of the second valve group 2.

[0026] The first one-way valve Y3 and the second one-way valve Y4 are both plug-in type one-way valves, which can prevent the oil outlet of the first pump P1 and the second pump P2 from being backflushed.

[0027] The first pump overflow valve Y2 and the second pump overflow valve Y1 are both plug-in type overflow valves, which can limit the maximum pressure of the oil outlet of the first pump P1 and the second pump P2, and play a protective role.

[0028] The electromagnetic valve X1, the ejector electromagnetic valve X3, the core pulling electromagnetic valve X4 and the mold locking electromagnetic valve X2 are all plate type electromagnetic valves, which can control the oil outlet reversing of the first pump P1 and the second pump P2.

[0029] The first to position detection switch X5 and the second to position detection switch X6 are installed on the ejector oil cylinder 5, which can detect whether the ejector oil cylinder 5 is extended to the position.

[0030] The process flow of the injection molding machine includes nozzle advancing, injection, pressure maintaining, pre-plasticizing, nozzle retreating, cooling, mold opening, ejecting, needle retracting, mold closing and nozzle advancing cycle process. The specific implementation of the above hydraulic control system in the process flow of the injection molding machine is as follows:

[0031] ① Nozzle advancing: the driver gives the speed and pressure command to the servo motor EM, and the servo motor EM drives the double pump first pump P1 and second pump P2. The output flow Q1 of the first pump P1 passes through the first one-way valve Y3 and enters the injection valve plate through the fifth oil port 12 to drive the nozzle to advance. The output flow Q2 of the second pump P2 flows to the first valve group 1, and since the electromagnetic valve X1 is not powered, the valve core is in the middle position, A / B is cut off, P is connected to T, and the flow Q2 flows to the cooler F2 through the third oil port 10 to circulate and cool the hydraulic oil in the integrated hydraulic oil tank F0.

[0032] ② Injection: the driver gives the speed and pressure command to the servo motor EM, and the servo motor EM drives the double pump first pump P1 and second pump P2. The left electromagnet YV1 of the electromagnetic valve X1 is powered, P is connected to B, A is connected to T, and the output flow Q2 of the second pump P2 passes through the one-way valve Y4. The output flow Q1 of the first pump P1 passes through the one-way valve Y3. Q1 and Q2 join together to enter the injection valve plate through the fifth oil port 12 to realize the injection action (satisfy the injection speed in the joint flow condition).

[0033] ③ Pressure maintaining: the driver gives the speed and pressure command to the servo motor EM, and the servo motor EM drives the double pump first pump P1 and second pump P2. The electromagnetic valve X1 is not powered, the valve core is in the middle position, A / B is cut off, P is connected to T, and the flow Q2 flows to the cooler F2 through the third oil port 10 to circulate and cool the hydraulic oil in the integrated hydraulic oil tank F0. The flow Q1 passes through the one-way valve Y3 and enters the injection valve plate through the fifth oil port 12 to realize the injection pressure maintaining action (pressure maintaining does not require large flow, and the flow Q1 can meet the requirements).

[0034] ④ Pre-plasticizing: the driver gives the speed and pressure command to the servo motor EM, the servo motor EM drives the double pump one pump P1 and two pump P2. The left end of the electromagnetic valve X1 electromagnet YV1 is powered, P passes B, A passes T, two pump P2 output flow Q2 through the check valve Y4; one pump P1 output flow Q1 through check valve Y3. Q1 and Q2 converge through the fifth oil port 12 into the pre-plasticizing oil motor, realizing the pre-plasticizing action (converging conditions meet the motor speed).

[0035] ⑤ Nozzle retreat: the driver gives the speed and pressure command to the servo motor EM, the servo motor EM drives the double pump one pump P1 and two pump P2, wherein one pump P1 output flow Q1 through check valve Y3, through the fifth oil port 12 into the injection valve plate, drive the nozzle forward. Two pump P2 output flow Q2 to the first valve group 1, because the electromagnetic valve X1 is not powered, the valve core is in the middle position, A / B cut-off, P passes T, flow Q2 through the third oil port 10 to the cooler F2, circulating cooling the hydraulic oil in the hydraulic oil tank F0.

[0036] ⑥ Mold opening, ejector pin, needle retreat, cooling (this patent can realize composite linkage): the driver gives the speed and pressure command to the servo motor EM, the servo motor EM drives the double pump one pump P1 and two pump P2. One pump P1 output flow Q1 through check valve Y3, through the fifth oil port 5 into the mold locking electromagnetic valve X2 P port, the left end of the mold locking electromagnetic valve X2 electromagnet YV7 is powered, P passes B, A passes T, realizing the mold opening action; at the same time, two pump P2 output flow Q2, the right end of the electromagnetic valve X1 electromagnet YV2 is powered, P passes A, B passes T, flow Q2 through the sixth oil port 13 into the P port of the second valve group 2. The right end of the ejector pin electromagnetic valve X3 electromagnet YV4 is powered, P passes A, B passes T, the ejector pin oil cylinder 5 extends, after extending to the position, through the second to position detection switch X6 to give the signal; the left end of the ejector pin electromagnetic valve X3 electromagnet YV3 is powered, P passes B, A passes T, the ejector pin oil cylinder 5 retracts, after retracting to the position, through the first to position detection switch X5 to give the signal; the electromagnetic valve X1 is powered off, the valve core is in the middle position, A / B cut-off, P passes T, realizing one cycle action of the ejector pin oil cylinder 5. Flow Q2 flows through the third oil port 3 to the cooler F2, circulating cooling the hydraulic oil in the integrated hydraulic oil tank F0. (Flow Q1 can meet the speed requirement of mold opening action; flow Q2 can meet the speed requirement of ejector pin oil cylinder action; because the action pressure of the two is low, the total power of the double pump is lower than the servo motor power P).

[0037] Among them, mold opening, ejector pin, needle retreat, cooling are composite linkage, so the cycle is shortened and the efficiency is improved under the condition that the whole process flow is unchanged.

[0038] The calculation formula used in this patent is:

[0039] The formula currently used for injection molding machine:

[0040] Wherein V=V1+V2, p=p1=p2.

[0041] In this patent, in the process of injection molding machine, ① nozzle advances, ③ pressure maintaining, ⑤ nozzle retreats, P2 output flow Q2 directly returns to the cooler, p2=0, so the power P , energy consumption is reduced.

[0042] Wherein the formula The respective meanings of the letters are as follows: P - the power of the servo motor EM, unit KW; V1 - the displacement of the double pump P1, unit cc; p1 - the outlet pressure of the double pump P1, unit bar; V2 - the displacement of the double pump P2, unit cc; p2 - the outlet pressure of the double pump P2, unit bar; n - the speed of the servo motor, unit rpm; η - the total efficiency.

[0043] ⑦Clamping: the driver gives the speed and pressure command to the servo motor EM, the servo motor EM drives the double pump one pump P1 and two pump P2. The left electromagnet YV1 of the electromagnetic valve X1 is electrified, P connects B, A connects T, the output flow Q2 of the two pump P2 passes through the check valve Y4; the output flow Q1 of the one pump P1 passes through the check valve Y3. Q1 and Q2 flow through the fifth oil port 5 into the P port of the clamping electromagnetic valve X2, the right electromagnet YV8 of the clamping electromagnetic valve X2 is electrified, P connects A, B connects T, the clamping action is realized (the clamping speed needs double pump flow).

[0044] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. A duplex pump high-efficiency energy-saving injection molding machine hydraulic control system, characterized in that, The utility model relates to a hydraulic system of injection molding machine, including: Integrated hydraulic oil tank F0 that holds hydraulic oil in, Power element, power element includes servo motor EM, servo motor EM is fixedly connected with one pump P1 and two pumps P2 through coupling Y9, and the oil suction port of one pump P1 and two pumps P2 all are connected with integrated hydraulic oil tank F0 through hydraulic rubber tube, and the oil outlet of one pump P1 is installed with one pump oil flange Y10, and the oil outlet of two pumps P2 is installed with two pump oil flange Y11, and one pump pressure sensor Y5 is installed on one pump oil flange Y10, and two pump pressure sensor Y7 is installed on two pump oil flange Y11, Control element, control element includes first valve group 1, second valve group 2 and third valve group 3, and first valve group 1 includes first check valve Y3, second check valve Y4, one pump overflow valve Y2, two pump overflow valve Y1, solenoid valve X1, one pump pressure gauge Y6 and two pump pressure gauge Y8, first check valve Y3 is connected with one pump P1, and it plays the role of preventing hydraulic oil reverse flow, second check valve Y4 is connected with two pump P2, and it plays the role of preventing hydraulic oil reverse flow, one pump overflow valve Y2 is installed at the outlet of one pump P1, and it is used for maintaining the pressure stability of one pump P1, two pump overflow valve Y1 is installed at the outlet of two pump P2, and it is used for maintaining the pressure stability of two pump P2, one pump pressure gauge Y6 and two pump pressure gauge Y8 are used for monitoring the pressure of one pump P1 and two pump P2 respectively, and the pressure is adjusted through one pump overflow valve Y2 and two pump overflow valve Y1, second valve group 2 includes ejector solenoid valve X3 and core-pulling solenoid valve X4, and third valve group 3 includes mold locking solenoid valve X2, Execution element, execution element includes mold locking cylinder 4, ejector cylinder 5, core-pulling cylinder 6 and injection action 7, mold locking cylinder 4 is controlled by mold locking solenoid valve X2, ejector cylinder 5 is controlled by ejector solenoid valve X3, core-pulling cylinder 6 is controlled by core-pulling solenoid valve X4, and injection action 7 is controlled by solenoid valve X1, Auxiliary element, auxiliary element includes oil suction filter F1 and cooler F2, oil suction filter F1 is connected with integrated hydraulic oil tank F0, and it is used for filtering the impurity in hydraulic oil, and cooler F2 is used for cooling hydraulic oil.

2. The high-efficiency energy-saving hydraulic control system of a twin pump injection molding machine according to claim 1, characterized in that, First valve group 1 is equipped with first oil port 8, second oil port 9, third oil port 10, fourth oil port 11, fifth oil port 12 and sixth oil port 13, first oil port 8 is connected with one pump oil flange Y10 through hydraulic rubber tube, second oil port 9 is connected with two pump oil flange Y11 through hydraulic rubber tube, third oil port 10 is connected with cooler F2 through hydraulic rubber tube, fourth oil port 11 is connected with the T port of mold locking solenoid valve X2, fifth oil port 12 is connected with the P port of mold locking solenoid valve X2, and sixth oil port 13 is connected with the P port of second valve group 2.

3. The high-efficiency energy-saving hydraulic control system of an injection molding machine with a twin pump according to claim 1, characterized in that, First check valve Y3 and second check valve Y4 are all set as plug-in check valve.

4. The high-efficiency energy-saving hydraulic control system of a twin pump injection molding machine according to claim 1, characterized in that, The first pump overflow valve Y2 and the second pump overflow valve Y1 are both configured as plug-in overflow valves.

5. The high-efficiency energy-saving hydraulic control system of an injection molding machine with a twin pump according to claim 1, characterized in that, The solenoid valve X1, the ejector solenoid valve X3, the core-pulling solenoid valve X4 and the mold-locking solenoid valve X2 are all configured as plate-type solenoid valves.

6. The high-efficiency energy-saving hydraulic control system of a twin pump injection molding machine according to claim 1, wherein, The ejector cylinder 5 is provided with a first in-position detection switch X5 and a second in-position detection switch X6.

7. A high-efficiency energy-saving injection molding machine injection molding process hydraulic control method for a twin pump, characterized in that, It relates to the hydraulic control system described in any one of claims 1 to 6, specifically as follows: ① Nozzle moves forward: The driver sends speed and pressure instructions to the servo motor EM. The servo motor EM drives the double pumps P1 and P2. The output flow Q1 of the first pump P1 passes through the first one-way valve Y3 and enters the injection valve plate through the fifth oil port 12, driving the nozzle forward. The second pump P2 outputs the flow Q2 to the first valve group 1. Since the solenoid valve X1 is not energized, the valve core is in the middle position, A / B is cut off, P is connected to T, and the flow Q2 flows through the third oil port 10 to the cooler F2 to circulate and cool the hydraulic oil in the integrated hydraulic oil tank F0; ② Injection: The driver sends speed and pressure instructions to the servo motor EM. The servo motor EM drives the duplex pumps P1 and P2. The electromagnet YV1 on the left end of the solenoid valve X1 is energized, P is connected to B, A is connected to T, and the output flow Q2 of the second pump P2 passes through the one-way valve Y4. The output flow Q1 of the first pump P1 passes through the one-way valve Y3. Q1 and Q2 merge and enter the injection valve plate through the fifth oil port 12 to realize the injection action. ③ Maintaining pressure: The driver sends speed and pressure instructions to the servo motor EM. The servo motor EM drives the first pump P1 and the second pump P2 of the duplex pump. The solenoid valve X1 is de-energized, the valve core is in the middle position, A / B is cut off, P is connected to T, and the flow Q2 flows through the third oil port 10 to the cooler F2 to circulate and cool the hydraulic oil in the integrated hydraulic oil tank F0. The flow Q1 passes through the one-way valve Y3 and enters the injection valve plate through the fifth oil port 12 to achieve injection pressure maintenance action; ④ Pre-plasticization: The driver gives speed and pressure instructions to the servo motor EM. The servo motor EM drives the double pumps P1 and P2. The electromagnet YV1 at the left end of the solenoid valve X1 is energized, P is connected to B, A is connected to T, the output flow Q2 of the second pump P2 passes through the one-way valve Y4, and the output flow Q1 of the first pump P1 passes through the one-way valve Y3. Q1 and Q2 merge into the pre-plasticization oil motor through the fifth oil port 12 to realize the pre-plasticization action; ⑤ Nozzle retracts: The driver sends speed and pressure instructions to the servo motor EM. The servo motor EM drives the double pumps P1 and P2. The output flow Q1 of the first pump P1 passes through the one-way valve Y3 and enters the injection valve plate through the fifth oil port 12, driving the nozzle forward. The second pump P2 outputs the flow Q2 to the first valve group 1. Since the solenoid valve X1 is not energized, the valve core is in the middle position, A / B is cut off, P is connected to T, and the flow Q2 flows through the third oil port 10 to the cooler F2 to circulate and cool the hydraulic oil in the hydraulic oil tank F0; ⑥Open mold, ejector, needle, cooling: the driver gives the speed and pressure command to servo motor EM, servo motor EM driven double pump one pump P1 and two pump P2, one pump P1 output flow Q1 through the check valve Y3, through the fifth oil port 5 into the mold locking solenoid valve X2 P port, the left end of the solenoid valve X2 YV7 gets electricity, P pass B, A pass T, open mold action is realized, at the same time two pump P2 output flow Q2, the right end of the solenoid valve X1 YV2 gets electricity, P pass A, B pass T, flow Q2 through the sixth oil port 13 into the second valve group 2 P port, the right end of the ejector solenoid valve X3 YV4 gets electricity, P pass A, B pass T, the ejector cylinder 5 stretches out, after stretching to the position, through the second to position detection switch X6 gives the signal, the left end of the ejector solenoid valve X3 YV3 gets electricity, P pass B, A pass T, the ejector cylinder 5 retracts, after retraction to the position, through the first to position detection switch X5 gives the signal, the solenoid valve X1 loses electricity, the valve core is in the middle position, A / B stop, P pass T, realize the ejector cylinder 5 a cycle action, flow Q2 through the third oil port 3 to the cooler F2, the hydraulic oil in the integrated hydraulic tank F0 is circulated and cooled; ⑦Mold closing: the driver gives the speed and pressure command to servo motor EM, servo motor EM driven double pump one pump P1 and two pump P2, the left end of the solenoid valve X1 YV1 gets electricity, P pass B, A pass T, two pump P2 output flow Q2 through the check valve Y4, one pump P1 output flow Q1 through the check valve Y3, Q1 and Q2 confluence through the fifth oil port 5 into the mold locking solenoid valve X2 P port, the right end of the solenoid valve X2 YV8 gets electricity, P pass A, B pass T, mold closing action is realized.

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