Hydraulic control system for forming battery cooling plate

Abstract

The utility model discloses a hydraulic control system for forming a battery cooling plate, which is characterized in that a middle cylinder is a plunger type cylinder, oil ports at the top of the middle cylinder are respectively connected with an upper oil tank through prefill valves, and a main pressure oil path is respectively connected with inlets of a cartridge valve seventeenth, a cartridge valve twenty-first and a cartridge valve twenty-fourth; an outlet of the cartridge valve 21 is connected with an inlet of a cartridge valve 18 and an inlet of a cartridge valve 19 respectively, an outlet of the cartridge valve 18 is connected with an inlet of a cartridge valve 20, and an outlet of the cartridge valve 20 is connected with lower cavity oil ports of the two side cylinders; outlets of the cartridge valve 17 and the cartridge valve 19 are communicated with the oil tank; an outlet of the cartridge valve 24 is connected with inlets of the cartridge valve 23, the cartridge valve 31 and the cartridge valve 34, an outlet of the cartridge valve 23 is communicated with the oil tank, an outlet of the cartridge valve 31 is connected with a top oil port of the middle cylinder, and an outlet of the cartridge valve 34 is connected with upper cavity oil ports of the two side cylinders respectively. The hydraulic control system can carry out tonnage conversion and adjust the feeding speed, and the machining efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a hydraulic press, in particular to a battery cooling plate forming hydraulic control system, belonging to the technical field of hydraulic control systems. Background Art

[0002] With the vigorous development of the new energy vehicle industry, the requirements for battery life are also increasing, and higher requirements are also placed on the heat dissipation of clustered batteries. It is a common practice to add a cooling plate at the bottom of the battery. The cooling plate is welded together by a flow channel plate and a base plate. The coolant circulates along the internal flow channel to take away the heat.

[0003] At present, the runner plate can be formed by either a hydraulic press or a mechanical press. It belongs to shallow drawing forming. The mold is equipped with a nitrogen cylinder. The hydraulic press or the mechanical press is mainly selected according to the output of the vehicle model and the return on investment efficiency. Regardless of the model, the body stiffness requirement is ≤1 / 8000. At the same time, in order to shorten the time of changing the mold, the left and right side moving workbench is usually used.

[0004] At present, the hydraulic control system of hydraulic press forming has the following problems:

[0005] 1. The working speed is single, and the tonnage conversion with fast no-load speed and slow full-load speed and high pressure cannot be achieved;

[0006] 2. Although the nitrogen pressure relief rebound control adopts the upper chamber back pressure method, the middle cylinder and the side cylinder are not controlled separately, and the pressure relief time is long, which affects the work efficiency; in addition, the filling valve control circuit does not adopt energy storage constant pressure control, and the response time is long, which also affects the operation efficiency of the machine tool;

[0007] 3. According to the product process requirements, the slider is required to slow down to a micro-motion state when the plate is deformed. Traditionally, this is achieved by reducing the speed of the hydraulic pump. However, the hydraulic pump has a minimum flow limit, which makes it impossible for the slider to micro-move downward;

[0008] 4. The four corners of the mobile workbench are not synchronized during the lifting and clamping process, and the impact noise is loud. Utility Model Content

[0009] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0010] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0011] The purpose of the utility model is to overcome the problems existing in the prior art and provide a battery cooling plate forming hydraulic control system, which can smoothly convert tonnage during working, improve working speed, increase nitrogen cylinder rebound adjustment to reduce impact, realize rapid switching of pressure relief return stroke, shorten waiting time, and improve processing efficiency.

[0012] In order to solve the above technical problems, the battery cooling plate forming hydraulic control system of the utility model comprises an intermediate cylinder and side cylinders symmetrically located on both sides of the intermediate cylinder, the intermediate cylinder is a plunger cylinder and the top oil port is connected to the upper oil tank through the intermediate cylinder filling valve, and the upper chambers of the cylinders on both sides are connected to the upper oil tank through the side cylinder filling valves respectively; the main pressure oil circuit is respectively connected to the inlet of the cartridge valve 17, the cartridge valve 21 and the cartridge valve 24, the outlet of the cartridge valve 21 is respectively connected to the inlet of the cartridge valve 18 and the cartridge valve 19, the outlet of the cartridge valve 18 is connected to the inlet of the cartridge valve 20, and the outlet of the cartridge valve 20 is connected to the lower chamber oil ports of the cylinders on both sides; the outlets of the cartridge valve 17 and the cartridge valve 19 are connected to the oil tank;

[0013] The outlet of cartridge valve 24 is connected to the inlets of cartridge valve 23, cartridge valve 31 and cartridge valve 34, the outlet of cartridge valve 23 leads to the oil tank, the outlet of cartridge valve 31 is connected to the top oil port of the middle cylinder, and the outlet of cartridge valve 34 is respectively connected to the upper cavity oil ports of the cylinders on both sides.

[0014] Furthermore, the hydraulic control port of the cartridge valve 17 is connected to the oil tank through a proportional relief valve, and the outlet of the cartridge valve 21 is also connected to the inlet of the cartridge valve 22 through a high-frequency response proportional valve 1, and the outlet of the cartridge valve 22 is connected to the oil tank.

[0015] Furthermore, the outlet of the cartridge valve 31 is also connected to the inlets of the cartridge valve 30 and the cartridge valve 32, the outlet of the cartridge valve 30 is connected to the oil tank, and the outlet of the cartridge valve 32 is connected to the oil tank through the high-frequency response proportional valve three-way;

[0016] The outlet of the cartridge valve 34 is also connected to the inlet of the cartridge valve 33. The outlet of the cartridge valve 33 is connected to the outlet oil circuit of the auxiliary pump M6 through the hydraulic control ports of the high-frequency response proportional valve two-way oil tank, the high-frequency response proportional valve 1, the high-frequency response proportional valve 2 and the high-frequency response proportional valve 3.

[0017] Furthermore, the main pressure oil circuit is also connected to the inlet of cartridge valve 26, and the outlet of cartridge valve 26 is connected to the inlet of cartridge valve 27 and cartridge valve 28 through cartridge valve 25;

[0018] The outlet of the cartridge valve 27 is connected to the P port of the solenoid valve 28, the A port of the solenoid valve 28 is connected to the lower hydraulic control port of the side cylinder filling valve, and the B port of the solenoid valve 28 is connected to the upper hydraulic control port of the side cylinder filling valve;

[0019] The outlet of cartridge valve 28 is connected to the P port of solenoid valve 27, the A port of solenoid valve 27 is connected to the lower hydraulic control port of the intermediate cylinder filling valve, and the B port of solenoid valve 27 is connected to the upper hydraulic control port of the intermediate cylinder filling valve.

[0020] Furthermore, the inlets of cartridge valves 27 and 28 are also connected to the oil port of the large accumulator, and the outlet oil circuit of the auxiliary pump M6 is provided with at least one small accumulator.

[0021] Further, the main pressure oil circuit is also connected to the P ports of the electromagnetic valve 15 and the electromagnetic valve 16, the A port of the electromagnetic valve 15 is connected to the hydraulic control port of the cartridge valve 24 through a shuttle valve, and the A port of the electromagnetic valve 16 is connected to the hydraulic control port of the cartridge valve 21 through a shuttle valve;

[0022] The outlet of the cartridge valve 20 is also connected to the P port of the solenoid valve 17, and the A port of the solenoid valve 17 is connected to the hydraulic control port of the cartridge valve 20;

[0023] The outlet of the cartridge valve 18 is also connected to the P port of the solenoid valve 18 through a one-way valve, and the A port of the solenoid valve 18 is connected to the hydraulic control port of the cartridge valve 18;

[0024] The outlet of the cartridge valve 18 is also connected to the P port of the solenoid valve 22 through the throttle valve, and the B port and T port of the solenoid valve 22 are connected to the oil tank.

[0025] Furthermore, the hydraulic control port of the cartridge valve 19 is connected to the P port of the solenoid valve 19, and is also connected to the A port of the solenoid valve 19 through the overflow valve, and the T port of the solenoid valve 19 is connected to the oil tank;

[0026] The hydraulic control port of the cartridge valve 22 is connected to the A port of the solenoid valve 20, and the P port of the solenoid valve 20 is connected to the inlet of the cartridge valve 22;

[0027] The outlet of the cartridge valve 20 is connected to the oil tank through the overflow valve and the solenoid valve 21.

[0028] Further, the hydraulic control port of the cartridge valve 34 is connected to the A port of the solenoid valve 23, and the P port of the solenoid valve 23 is connected to the inlet of the cartridge valve 34;

[0029] The hydraulic control port of the cartridge valve 33 is connected to the A port of the solenoid valve 24, and the P port of the solenoid valve 24 is connected to the outlet of the cartridge valve 33;

[0030] The hydraulic control port of the cartridge valve 32 is connected to the A port of the solenoid valve 25, and the P port of the solenoid valve 25 is connected to the outlet of the cartridge valve 32;

[0031] The hydraulic control port of the cartridge valve 30 is connected to the A port of the solenoid valve 26, and the P port of the solenoid valve 26 is connected to the outlet of the cartridge valve 30;

[0032] The hydraulic control port of the cartridge valve 26 is connected to the A port of the solenoid valve 29, and the P port of the solenoid valve 29 is connected to the inlet of the cartridge valve 26.

[0033] Furthermore, the outlet oil circuit of the auxiliary pump M7 is connected to the P port of the three-position four-way reversing valve 1, the T port of the three-position four-way reversing valve 1 is connected to the oil tank, the A port and the B port of the three-position four-way reversing valve 1 are connected to the upper and lower chamber oil ports of the shift platform lifting and clamping cylinder through the throttle valve and the hydraulic lock, and the middle position function of the three-position four-way reversing valve 1 is Y-type.

[0034] Furthermore, the outlet oil circuit of the auxiliary pump M7 is also connected to the P port of the three-position four-way reversing valve 2, the T port of the three-position four-way reversing valve 2 is connected to the oil tank, the A port and the B port of the three-position four-way reversing valve 2 are connected to the upper and lower chamber oil ports of the locking cylinder, and the middle position function of the three-position four-way reversing valve 2 is Y-type.

[0035] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. The battery cooling plate of new energy vehicles is usually formed by pressing a thin aluminum plate. By setting the oil inlet of the upper chamber of the main cylinder with a tonnage conversion function, when working, the cylinders on both sides are first filled with oil, and then the main cylinder is filled with oil, avoiding the time loss of synchronous oil inlet of the main cylinder and the side cylinder, and improving work efficiency;

[0036] 2. The pressure relief control of the middle cylinder and the upper chamber of the side cylinder is controlled separately. Through the flexible control of the proportional valve curve, it can achieve rapid pressure relief without impact in cooperation with the active filling valve. The active filling valve can achieve constant pressure control through the solenoid valve and the accumulator to meet the rapid response.

[0037] 3. When nitrogen pressure relief control is performed, after the slider pressure maintenance is completed, the proportional valve of the upper chamber of the main cylinder is combined and set according to the size of the nitrogen rebound force: when the nitrogen rebound force is small, the upper chamber pressure of the middle large cylinder can be quickly unloaded, and the upper chamber pressure of the cylinders on both sides can be adjusted through the opening of the high-frequency response proportional valve 2 YAC, and can also be adjusted through the adjustment rod of the cartridge valve 33 C33;

[0038] When the nitrogen rebound force is relatively large, the back pressure of the upper chamber of the main cylinder is realized by synchronously controlling the high-frequency response proportional valve 2 YAC / high-frequency response proportional valve 3 YAD; combined or separate control can improve work efficiency. The mold nitrogen rebound force has been measured at the beginning of the design. In order to facilitate the rapid pressure relief of the middle large cylinder, solenoid valve 26 YA26 and cartridge valve 30 C30 are designed for pressure relief;

[0039] 4. In the tonnage conversion of the upper chamber of the main cylinder, the solenoid valve 23 YA23 controls the opening of the cartridge valve 34 C34 to supply oil to the upper chambers of the cylinders on both sides. In this process, in order to improve the molding rate of the product, a 15MPa safety relief valve control is designed. When the solenoid valve 23 YA23 fails to work, the control oil of the cartridge valve can also be opened once it exceeds 15MPa to meet the tonnage required for product pressing and molding;

[0040] 5. A micro-motion downward pressure control is provided, which is not controlled by the speed of the servo pump. When the servo pump is below a certain speed, problems such as failure to increase high pressure and large oil pulsation at the pump outlet will cause unstable pressure during pressing and molding. In order to improve the molding rate of the product, a back pressure circuit is set in the oil circuit of the lower chamber of the piston cylinder, so that the slider runs under a large back pressure, eliminating the occurrence of creeping phenomenon.

[0041] 6. The lifting and clamping control system of the mobile platform adds a one-way oil return throttling adjustment, so that the four corners of the lifting and clamping process are basically synchronized to avoid twisting during operation, and also reduce the impact sound during operation. It can be adjusted appropriately according to the weight of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. The drawings are only provided for reference and explanation, not for limiting the present utility model. Among them:

[0043] Figure 1 This is a schematic diagram of the hydraulic control system for the battery cooling plate of the utility model;

[0044] In the figure: 1. Middle cylinder; 2. Side cylinder; 3. Platform lifting and clamping cylinder; 4. Locking cylinder;

[0045] Cartridge valve one C1; Cartridge valve two C2; Cartridge valve three C3; Cartridge valve four C4; Cartridge valve five C5; Cartridge valve six C6; Cartridge valve seven C7; Cartridge valve eight C8; Cartridge valve nine C9; Cartridge valve ten C10; Cartridge valve eleven C11; Cartridge valve twelve C12; Cartridge valve thirteen C13; Cartridge valve fourteen C14; Cartridge valve fifteen C15; Cartridge valve sixteen C16; Cartridge valve seventeen C17; Cartridge valve eighteen C18; Cartridge valve nineteen C19; Cartridge valve 20 C20; Cartridge valve 21 C21; Cartridge valve 22 C22; Cartridge valve 23 C23; Cartridge valve 24 C24; Cartridge valve 25 C25; Cartridge valve 26 C26; Cartridge valve 27 C27; Cartridge valve 28 C28; Cartridge valve 29 C29; Cartridge valve 30 C30; Cartridge valve 31 C31; Cartridge valve 32 C32; Cartridge valve 33 C33; Cartridge valve 34 C34; Cartridge valve 35 C35;

[0046] Solenoid valve one YA1; solenoid valve two YA2; solenoid valve three YA3; solenoid valve four YA4; solenoid valve five YA5; solenoid valve six YA6; solenoid valve seven YA7; solenoid valve eight YA8; solenoid valve nine YA9; solenoid valve ten YA10; solenoid valve eleven YA11; solenoid valve twelve YA12; solenoid valve thirteen YA13; solenoid valve fourteen YA14; solenoid valve fifteen YA15; solenoid valve sixteen YA16; solenoid valve seventeen YA17; solenoid valve eighteen YA18; solenoid valve nineteen YA19; solenoid valve twenty YA20; solenoid valve twenty-one YA21; solenoid valve twenty-two YA22; solenoid valve twenty-three YA23; solenoid valve twenty-four YA24; solenoid valve twenty-five YA25; solenoid valve twenty-six YA26; solenoid valve twenty-seven YA27; solenoid valve twenty-eight YA28; solenoid valve twenty-nine YA29;

[0047] Proportional overflow valve YAA; high-frequency response proportional valve one YAB; high-frequency response proportional valve two YAC; high-frequency response proportional valve three YAD; proportional directional valve YAE; throttle valve JK; hydraulic lock DK. DETAILED DESCRIPTION

[0048] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0049] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific figures. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0051] like Figure 1 As shown, the battery cooling plate forming hydraulic control system of the utility model is mainly used to control the main cylinder, the platform lifting clamping cylinder 3 and the locking cylinder 4 of the hydraulic press. The main cylinder includes an intermediate cylinder 1 and side cylinders 2 symmetrically located on both sides of the intermediate cylinder 1. The intermediate cylinder 1 is a 2000T plunger cylinder, and the side cylinders 2 are 1000T piston cylinders. The matching filling valves are all actively controlled structures.

[0052] The lower oil tank is equipped with main power pumps M1 to M4, all of which are double pumps. The main pump outlet of the main power pump M1 is connected to the inlets of cartridge valve C1 and cartridge valve C2. The outlet of cartridge valve C1 supplies oil to the main pressure oil circuit, and the outlet of cartridge valve C2 returns to the oil tank. The hydraulic control port of cartridge valve C2 is controlled by solenoid valve YA1.

[0053] The auxiliary pump outlet of the main power pump M1 is connected to the inlet of cartridge valve three C3 and cartridge valve four C4. The outlet of cartridge valve three C3 supplies oil to the main pressure oil circuit, and the outlet of cartridge valve four C4 returns to the oil tank. The hydraulic control port of cartridge valve four C4 is controlled by solenoid valve two YA2.

[0054] The main pump outlet of the main power pump M2 is connected to the inlet of the cartridge valve C5 and the cartridge valve C6. The outlet of the cartridge valve C5 supplies oil to the main pressure oil circuit, and the outlet of the cartridge valve C6 returns to the oil tank. The hydraulic control port of the cartridge valve C6 is controlled by the solenoid valve YA3.

[0055] The auxiliary pump outlet of the main power pump M2 is connected to the inlet of the cartridge valve seven C7 and the cartridge valve eight C8. The outlet of the cartridge valve seven C7 supplies oil to the main pressure oil circuit, and the outlet of the cartridge valve eight C8 returns to the oil tank. The hydraulic control port of the cartridge valve eight C8 is controlled by the solenoid valve four YA4.

[0056] The main pump outlet of the main power pump M3 is connected to the inlet of the cartridge valve nine C9 and the cartridge valve ten C10. The outlet of the cartridge valve nine C9 supplies oil to the main pressure oil circuit, and the outlet of the cartridge valve ten C10 returns to the oil tank. The hydraulic control port of the cartridge valve ten C10 is controlled by the solenoid valve five YA5;

[0057] The auxiliary pump outlet of the main power pump M3 is connected to the inlet of the cartridge valve eleven C11 and the cartridge valve twelve C12. The outlet of the cartridge valve eleven C11 supplies oil to the main pressure oil circuit, and the outlet of the cartridge valve twelve C12 returns to the oil tank. The hydraulic control port of the cartridge valve twelve C12 is controlled by the solenoid valve six YA6.

[0058] The main pump outlet of the main power pump M4 is connected to the inlet of the cartridge valve thirteen C13 and the cartridge valve fourteen C14. The outlet of the cartridge valve thirteen C13 supplies oil to the main pressure oil circuit, and the outlet of the cartridge valve fourteen C14 returns to the oil tank. The hydraulic control port of the cartridge valve fourteen C14 is controlled by the solenoid valve seven YA7;

[0059] The auxiliary pump outlet of the main power pump M4 is connected to the inlet of the cartridge valve C15 and the cartridge valve C16. The outlet of the cartridge valve C15 supplies oil to the main pressure oil circuit, and the outlet of the cartridge valve C16 returns to the oil tank. The hydraulic control port of the cartridge valve C16 is controlled by the solenoid valve YA8.

[0060] Auxiliary pumps M5, M6 and M7 are also installed on the lower oil tank. Auxiliary pump M5 is used for circulating cooling and filtering of oil. The outlet of auxiliary pump M6 is connected to the inlet of cartridge valve C29, the outlet of cartridge valve C29 is connected to the oil tank, and the hydraulic control port of cartridge valve C29 is controlled by solenoid valve YA9; the outlet of auxiliary pump M6 supplies oil to the control oil circuit of each high-frequency proportional valve through the filter unit and the one-way valve.

[0061] The outlet of the auxiliary pump M7 is connected to the inlet of the cartridge valve C35, the outlet of the cartridge valve C35 is connected to the oil tank, and the hydraulic control port of the cartridge valve C35 is controlled by the solenoid valve YA10; the outlet of the auxiliary pump M7 supplies oil to the movable platform lifting clamping cylinder 3 and the locking cylinder 4.

[0062] The middle cylinder 1 is a plunger cylinder and the top oil port is connected to the upper oil tank through the middle cylinder filling valve SF350. The upper chambers of the cylinders 2 on both sides are connected to the upper oil tank through the side cylinder filling valves SF300. The main pressure oil circuit is connected to the inlets of the cartridge valve 17 C17, the cartridge valve 21 C21 and the cartridge valve 24 C24 respectively. The outlet of the cartridge valve 21 C21 is connected to the inlets of the cartridge valve 18 C18 and the cartridge valve 19 C19 respectively. The outlet of the cartridge valve 18 C18 is connected to the inlet of the cartridge valve 20 C20. The outlet of the cartridge valve 20 C20 is connected to the lower chamber oil ports of the cylinders on both sides. The outlets of the cartridge valve 17 C17 and the cartridge valve 19 C19 are connected to the oil tank.

[0063] The outlet of cartridge valve twenty-four C24 is connected to the inlets of cartridge valve twenty-three C23, cartridge valve thirty-one C31 and cartridge valve thirty-four C34, the outlet of cartridge valve twenty-three C23 leads to the oil tank, the outlet of cartridge valve thirty-one C31 is connected to the top oil port of the middle cylinder, and the outlet of cartridge valve thirty-four C34 is respectively connected to the upper cavity oil ports of the cylinders on both sides.

[0064] The hydraulic control port of cartridge valve seventeen C17 is connected to the oil tank through the proportional relief valve YAA, and the outlet of cartridge valve twenty-one C21 is also connected to the inlet of cartridge valve twenty-two C22 through the high-frequency response proportional valve YAB, and the outlet of cartridge valve twenty-two C22 is connected to the oil tank.

[0065] The outlet of the cartridge valve 31 C31 is also connected to the inlets of the cartridge valve 30 C30 and the cartridge valve 32 C32. The outlet of the cartridge valve 30 C30 leads to the oil tank, and the outlet of the cartridge valve 32 C32 leads to the oil tank through the high-frequency response proportional valve 3 YAD.

[0066] The outlet of cartridge valve thirty-four C34 is also connected to the inlet of cartridge valve thirty-three C33. The outlet of cartridge valve thirty-three C33 is connected to the oil tank through high-frequency response proportional valve two YAC. The hydraulic control ports of high-frequency response proportional valve one YAB, high-frequency response proportional valve two YAC and high-frequency response proportional valve three YAD are respectively connected to the outlet oil circuit of auxiliary pump M6.

[0067] The main pressure oil circuit is also connected to the inlet of cartridge valve C26, and the outlet of cartridge valve C26 is connected to the inlet of cartridge valve C27 and cartridge valve C28 through cartridge valve C25;

[0068] The outlet of cartridge valve twenty-seven C27 is connected to the P port of solenoid valve twenty-eight YA28, the A port of solenoid valve twenty-eight YA28 is connected to the lower hydraulic control port of the side cylinder filling valve SF300, and the B port of solenoid valve twenty-eight YA28 is connected to the upper hydraulic control port of the side cylinder filling valve SF300;

[0069] The outlet of cartridge valve twenty-eight C28 is connected to the P port of solenoid valve twenty-seven YA27, the A port of solenoid valve twenty-seven YA27 is connected to the lower hydraulic control port of the intermediate cylinder filling valve SF350, and the B port of solenoid valve twenty-seven YA27 is connected to the upper hydraulic control port of the intermediate cylinder filling valve SF350.

[0070] The inlets of cartridge valve twenty-seven C27 and cartridge valve twenty-eight C28 are also connected to the oil port of the large accumulator AC1, and the outlet oil circuit of the auxiliary pump M6 is provided with at least one small accumulator AC2.

[0071] The main pressure oil circuit is also connected to the P port of the electromagnetic valve 15 YA15 and the electromagnetic valve 16 YA16. The A port of the electromagnetic valve 15 YA15 is connected to the hydraulic control port of the cartridge valve 24 C24 through a shuttle valve. The A port of the electromagnetic valve 16 YA16 is connected to the hydraulic control port of the cartridge valve 21 C21 through a shuttle valve.

[0072] The outlet of the cartridge valve twenty C20 is also connected to the P port of the solenoid valve seventeen YA17, and the A port of the solenoid valve seventeen YA17 is connected to the hydraulic control port of the cartridge valve twenty C20;

[0073] The outlet of the cartridge valve 18 C18 is also connected to the P port of the solenoid valve 18 YA18 through a one-way valve, and the A port of the solenoid valve 18 YA18 is connected to the hydraulic control port of the cartridge valve 18 C18;

[0074] The outlet of the cartridge valve 18 C18 is also connected to the P port of the solenoid valve 22 YA22 through the throttle valve, and the B port and T port of the solenoid valve 22 YA22 are connected to the oil tank.

[0075] The hydraulic control port of the cartridge valve 19C19 is connected to the P port of the solenoid valve 19YA19, and is also connected to the A port of the solenoid valve 19YA19 through the relief valve. The T port of the solenoid valve 19YA19 is connected to the oil tank;

[0076] The hydraulic control port of the cartridge valve twenty-two C22 is connected to the A port of the solenoid valve twenty YA20, and the P port of the solenoid valve twenty YA20 is connected to the inlet of the cartridge valve twenty-two C22;

[0077] The outlet of cartridge valve 20 C20 passes through the oil tank through the overflow valve and solenoid valve 21 YA21.

[0078] The hydraulic control port of cartridge valve thirty-four C34 is connected to the A port of solenoid valve twenty-three YA23, and the P port of solenoid valve twenty-three YA23 is connected to the inlet of cartridge valve thirty-four C34;

[0079] The hydraulic control port of cartridge valve thirty-three C33 is connected to the A port of solenoid valve twenty-four YA24, and the P port of solenoid valve twenty-four YA24 is connected to the outlet of cartridge valve thirty-three C33;

[0080] The hydraulic control port of cartridge valve thirty-two C32 is connected to the A port of solenoid valve twenty-five YA25, and the P port of solenoid valve twenty-five YA25 is connected to the outlet of cartridge valve thirty-two C32;

[0081] The hydraulic control port of the cartridge valve thirty C30 is connected to the A port of the solenoid valve twenty-six YA26, and the P port of the solenoid valve twenty-six YA26 is connected to the outlet of the cartridge valve thirty C30.

[0082] The hydraulic control port of cartridge valve twenty-six C26 is connected to the A port of solenoid valve twenty-nine YA29, and the P port of solenoid valve twenty-nine YA29 is connected to the inlet of cartridge valve twenty-six C26.

[0083] The outlet oil circuit of the auxiliary pump M7 is connected to the P port of the three-position four-way reversing valve 1, the T port of the three-position four-way reversing valve 1 is connected to the oil tank, the A port and the B port of the three-position four-way reversing valve 1 are connected to the upper and lower chamber oil ports of the shifting platform lifting clamping cylinder 3 through the throttle valve JK and the hydraulic lock DK, and the middle position function of the three-position four-way reversing valve 1 is Y-type.

[0084] The outlet oil circuit of the auxiliary pump M7 is also connected to the P port of the three-position four-way reversing valve 2, the T port of the three-position four-way reversing valve 2 is connected to the oil tank, the A port and the B port of the three-position four-way reversing valve 2 are connected to the upper and lower chamber oil ports of the locking cylinder 4, and the middle position function of the three-position four-way reversing valve 2 is Y-type.

[0085] The working process of this hydraulic press is as follows:

[0086] The solenoid valves YA1, YA2, YA3, YA4, YA5, YA6, YA7 and YA8 at the pump ports are all powered on and working, and the main power pumps M1 to M4 of the double pumps are all put into operation; the proportional relief valve YAA receives a signal to build up pressure, so that the hydraulic control port of the cartridge valve C17 is built up and closed, so that the pressure oil circuit is built up;

[0087] The solenoid valve fifteen YA15 is energized and works, the P port is connected to the B port, the A port is connected to the T port, the cartridge valve twenty-four C24 is opened due to the pressure relief of the hydraulic control port, and the pump source oil enters the upper chamber of the intermediate cylinder 2000T through the cartridge valve twenty-four C24 and the cartridge valve thirty-one C31.

[0088] The solenoid valve 17 YA17 is energized to work, the A port is connected to the T port, and the cartridge valve 20 C20 is opened due to the pressure relief of the hydraulic control port;

[0089] The solenoid valve 18YA18 is energized to work, the A port is connected to the T port, and the cartridge valve 18C18 is opened due to the pressure relief of the hydraulic control port;

[0090] The solenoid valve 19 YA19 is energized to work, the A port is connected to the T port, and the cartridge valve 19 C19 is opened due to the pressure relief of the hydraulic control port;

[0091] Solenoid valve 20 YA20 is energized to work, port A is connected to port T, and cartridge valve 22 C22 is opened due to pressure relief at the hydraulic control port;

[0092] Under the condition of the deadweight of the slider and the piston rod, the high-frequency response proportional valve YAB gives a full signal and the opening reaches the maximum to meet the fast lowering speed. The oil in the lower chamber of the side cylinder returns to the oil tank through the cartridge valve 20 C20, the cartridge valve 18 C18, the cartridge valve 19 C19 and the cartridge valve 22 C22.

[0093] The solenoid valve 27 YA27 in the reversing solenoid valve of the charging valve is energized to work, the P port is connected to the B port, the A port is connected to the T port, and the pressure oil in the 63L accumulator enters the upper hydraulic control port of the intermediate cylinder charging valve SF350 through the cartridge valve 28 C28 and the B port of the solenoid valve 27 YA27 to open it;

[0094] The solenoid valve 28 YA28 in the charging valve reversing solenoid valve is energized and works, the P port is connected to the B port, the A port is connected to the T port, and the pressure oil in the 63L accumulator enters the upper hydraulic control port of the cylinder charging valve SF300 on both sides through the cartridge valve 27 C27 and the B port of the solenoid valve 28 YA28 to open it; to meet the need to replenish the oil in the upper chamber of the side cylinder and the middle cylinder from the oil tank during the rapid descent of the slider.

[0095] After reaching the speed conversion point, the solenoid valves 1 YA1, 2 YA2, 3 YA3, 4 YA4, 5 YA5, 6 YA6, 7 YA7 and 8 YA8 at the pump port continue to be powered and work;

[0096] Solenoid valve 15 YA15, solenoid valve 17 YA17, solenoid valve 18 YA18 and solenoid valve 19 YA19 are energized and continue to operate. The opening of the high-frequency response proportional valve YAB is gradually closed through a curve under electrical control. When its opening is less than 10%, the solenoid valve 20 YA20 loses power, causing the cartridge valve 22 C22 to close.

[0097] The use of curve control can reduce the hydraulic shock during transition, changing the hard closing to a flexible closing. The oil in the lower chamber of the side cylinder will finally return to the oil tank only through the cartridge valve nineteen C19.

[0098] During this process, solenoid valve 28 YA28 continues to be energized and working, while solenoid valve 27 YA27 loses power and closes. The pump source oil will only enter the upper chamber of the 2000T middle cylinder through cartridge valve 24 C24 and cartridge valve 31 C31. The 1000T side cylinders on both sides are still replenished with oil from the oil tank through the side cylinder filling valve SF300 to achieve rapid working progress.

[0099] When the upper and lower molds are closed, when the pressure sensor of the upper cavity of the middle cylinder is detected to have a pressure of 5MPa, the electromagnetic valve 28 YA28 loses power, and the side cylinder filling valve SF300 of the cylinders on both sides is closed; at the same time, the electromagnetic valve 23 YA23 is energized, the A port is connected to the T port, and the cartridge valve 34 C34 is opened;

[0100] The pump source enters the upper chambers of the cylinders on both sides from cartridge valve thirty-four C34. In this state, the pump source will supply the upper chambers of the three master cylinders. The oil in the lower chambers of the cylinders on both sides returns to the oil tank through cartridge valve twenty C20, cartridge valve eighteen C18, and cartridge valve nineteen C19 to meet the full tonnage pressing requirements.

[0101] All solenoid valves are de-energized and use a sealed pressure-maintaining method.

[0102] Because the mold is equipped with a nitrogen cylinder, if the filling valve of the upper chamber of the main cylinder is opened directly during pressure relief, the rebound of the nitrogen cylinder will quickly lift the slider and the piston rod, resulting in a large hydraulic shock. In this case, the oil pressure of the upper chamber of the main cylinder needs to be slowly released, and the rebound of the nitrogen cylinder and the back pressure of the upper chamber of the main cylinder are used to reach a balance point to achieve the slow lifting of the slider. The solenoid valve 1 YA1 and the solenoid valve 2 YA2 of the pump port of the main power pump M1 are powered on, and the other pump port solenoid valves are not powered on, and the proportional relief valve YAA only builds 20% of the pressure.

[0103] Solenoid valve No. 24 YA24 is energized and works, port A is connected to port T, and cartridge valve No. 33 C33 opens due to pressure loss at the hydraulic control port;

[0104] Solenoid valve twenty-five YA25 is energized to work, port A is connected to port T, and cartridge valve thirty-four C34 is opened due to pressure loss at the hydraulic control port;

[0105] The high-frequency response proportional valve three YAD is opened to 80%, and the high-frequency response proportional valve two YAC is opened to 30%. At the same time, the solenoid valve twenty-six YA26 is energized, and the A port is connected to the T port. The cartridge valve thirty C30 is opened due to the loss of pressure at the hydraulic control port, and part of the pressure oil of the middle cylinder returns to the oil tank from the cartridge valve thirty C30;

[0106] The whole process adopts the rapid pressure relief of the middle large cylinder, and the upper chambers of the cylinders on both sides form back pressure to meet the control requirements of nitrogen rebound. At the same time, the solenoid valve sixteen YA16 and the solenoid valve eighteen YA18 are energized to work, and the pump source oil enters the lower chambers of the cylinders on both sides through the cartridge valve twenty-one C21, the cartridge valve eighteen C18, and the cartridge valve twenty C20 to supplement the lower chamber cavity formed by the rebound of the nitrogen cylinder.

[0107] When the nitrogen cylinder pressure relief is about to end and the main cylinder upper chamber pressure sensor detects a pressure of 5MPa, solenoid valve 27 YA27 and solenoid valve 28 YA28 are energized to open the middle cylinder filling valve SF350 and the side cylinder filling valve SF300 to achieve direct connection between the middle cylinder and the side cylinder upper chamber and the oil tank, thereby achieving complete pressure relief.

[0108] The solenoid valves YA1, YA2, YA3, YA4, YA5, YA6, YA7 and YA8 at the pump port of the main power pump are all energized and working, the proportional relief valve YAA builds 50% pressure, the solenoid valves YA16 and YA18 are energized and working, the pump source oil enters the lower chamber of the cylinders on both sides through the cartridge valve C21, C18 and C20, the upper chamber of the side cylinder returns to the oil tank through the side cylinder filling valve SF300, and the oil in the middle cylinder returns to the oil tank through the middle cylinder filling valve SF350, meeting the return speed requirement.

[0109] When the upper limit of the return stroke is reached, the servo motor adjusts the speed to achieve early deceleration to reduce the hydraulic shock when the return stroke stops.

[0110] Solenoid valve twenty-seven YA27 and solenoid valve twenty-eight YA28 are energized to open the side cylinder filling valve SF300 and the middle cylinder filling valve SF350. By controlling the energizing time of solenoid valve seventeen YA17 and solenoid valve twenty-two YA22, the pressure-free downward stroke of the slider is controlled to meet the needs of mold adjustment.

[0111] When oil enters the upper chamber of the cylinder, if there is no back pressure in the lower chamber, the slider will move downward once the pressure in the upper chamber overcomes the friction between the cylinder and the slider. When the speed is slow and the friction is uneven, the slider will stop after moving downward for a while and then move downward when the thrust of the upper chamber overcomes the friction. If the thrust cannot overcome the friction, the slider will stop, causing crawling.

[0112] In order to meet the needs of extremely slow forming of products, a micro-pressing function is designed. The solenoid valve YA1 at the pump port of the main power pump M1 is energized to work, the P port of the proportional directional valve YAE is connected to the A port and controls the opening size, the B port is connected to the T port, the solenoid valve 23 YA23 is energized to work, and the pump source oil enters the upper chamber of the side cylinder through the proportional directional valve YAE and the cartridge valve 34 C34, and enters the upper chamber of the middle cylinder through the cartridge valve 31 C31;

[0113] When the electromagnetic valve YA21 is powered, the oil in the lower chamber of the side cylinder returns to the oil tank through the electromagnetic valve YA21. A damping and overflow valve are set on the oil line of the electromagnetic valve YA21 to establish a certain back pressure in the lower chamber of the oil cylinder so that the slider runs under a large back pressure. The back pressure is much greater than the friction force, so the thrust of the upper chamber will be a constant output, eliminating the occurrence of creeping. The speed of micro-motion pressing is adjusted by the proportional directional valve YAE.

[0114] The control oil required for high-frequency response proportional valve 1 YAB, high-frequency response proportional valve 2 YAC and high-frequency response proportional valve 3 YAD is provided by auxiliary pump M6. When solenoid valve 9 YA9 is energized and works, the 16L accumulator is filled with liquid, and the pressure is controlled by the pressure relay.

[0115] The oil controlled by the charging valve is provided by the 63L accumulator, and the charging is carried out by the main power pump. In the pressure maintaining stage or the stop delay stage, the proportional relief valve YAA builds up 50% pressure, the solenoid valve YA29 is energized and works, and the pump source oil is used to charge the 63L accumulator through the cartridge valve C26 / cartridge valve C25, and the pressure is controlled by the pressure relay.

[0116] To facilitate mold replacement, this equipment is equipped with double mobile workbenches on the left and right sides, and the lifting and clamping control of the mobile tables are controlled by a separate system.

[0117] Lifting: Solenoid valve 10 YA10 is energized to work, auxiliary pump M7 builds pressure, solenoid valve 12 YA12 on the right side of three-position four-way reversing valve 1 is energized to work, and the pump source oil enters the lower chamber of the lifting clamping cylinder through the three-position four-way reversing valve 1, the throttle valve, and the hydraulic lock, and the oil in the upper chamber returns to the oil tank;

[0118] Clamping: Solenoid valve 10 YA10 is energized to work, auxiliary pump M7 builds pressure, solenoid valve 11 YA11 on the left side of three-position four-way reversing valve 1 is energized to work, and the pump source oil enters the upper chamber of the lifting and clamping cylinder through the three-position four-way reversing valve 1, the throttle valve, and the hydraulic lock, and the oil in the lower chamber returns to the oil tank;

[0119] Compared with the previous hydraulic system, a one-way throttling control is added to achieve flow adjustment during lifting and clamping. Sometimes when the mold on the mobile table is light, the flow needs to be reduced; when the mold is heavy, the flow needs to be increased, and the return oil throttling is adopted.

[0120] When performing mold maintenance, personnel need to enter the machine tool to operate. Once entering the danger zone, there will be safety issues. By adding a locking cylinder device, personnel can fix the slide and the upper beam before entering the danger zone, which is achieved by a latch.

[0121] Locking: Solenoid valve 10 YA10 is energized to work, the oil pump builds pressure, the solenoid valve 13 YA13 on the right side of the three-position four-way reversing valve 2 is energized to work, the pump source oil enters the locking cylinder plug chamber through the throttle valve and the three-position four-way reversing valve 2, and the rod chamber oil returns to the oil tank through the T port;

[0122] Release: solenoid valve 10 YA10 is energized and works, the oil pump builds pressure, solenoid valve 14 YA14 is energized and works, the pump source oil enters the locking cylinder rod chamber through the throttle valve and the three-position four-way reversing valve 2, and the plug chamber oil returns to the oil tank through the T port.

[0123] 13. A safety relief valve is provided between the A port of the solenoid valve 23 YA23 and the inlet of the cartridge valve 34 C34. Its function is that when there is a problem with the solenoid valve, the cartridge valve 34 C34 can also be pushed open by the safety relief valve. The setting pressure of the safety relief valve is calculated to be 5MPa based on the area ratio of the cartridge valve.

[0124] Solenoid valve seventeen YA17, solenoid valve eighteen YA18, solenoid valve twenty-four YA24, solenoid valve twenty-five YA25 and solenoid valve twenty-six YA26 are two-position three-way solenoid reversing valves, solenoid valve twenty-one YA21 is a two-position two-way solenoid reversing valve, and the others not specified are two-position four-way solenoid reversing valves.

[0125] The above description is only the preferred feasible embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model, but does not limit the scope of patent protection of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. In addition to the above embodiments, the utility model can also have other implementation modes without departing from the spirit and scope of the utility model. The utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents. The technical features not described in the utility model can be achieved by or using existing technologies, which will not be repeated here.

Claims

1. A battery cooling plate forming hydraulic control system, comprising a middle cylinder (1) and side cylinders (2) symmetrically located on both sides of the middle cylinder (1), the middle cylinder (1) is a plunger cylinder and the top oil port is connected to the upper oil tank through the middle cylinder filling valve, and the upper chambers of the two side cylinders (2) are connected to the upper oil tank through the side cylinder filling valves, respectively, and are characterized in that: The main pressure oil circuit is respectively connected to the inlets of cartridge valve seventeen (C17), cartridge valve twenty-one (C21) and cartridge valve twenty-four (C24); the outlet of cartridge valve twenty-one (C21) is respectively connected to the inlets of cartridge valve eighteen (C18) and cartridge valve nineteen (C19); the outlet of cartridge valve eighteen (C18) is connected to the inlet of cartridge valve twenty (C20); the outlet of cartridge valve twenty (C20) is connected to the lower chamber oil ports of the cylinders on both sides; the outlets of cartridge valve seventeen (C17) and cartridge valve nineteen (C19) are connected to the oil tank; The outlet of cartridge valve twenty-four (C24) is connected to the inlets of cartridge valve twenty-three (C23), cartridge valve thirty-one (C31) and cartridge valve thirty-four (C34); the outlet of cartridge valve twenty-three (C23) is connected to the oil tank, the outlet of cartridge valve thirty-one (C31) is connected to the top oil port of the middle cylinder, and the outlet of cartridge valve thirty-four (C34) is respectively connected to the upper cavity oil ports of the cylinders on both sides.

2. The battery cooling plate forming hydraulic control system according to claim 1, characterized in that: The hydraulic control port of the cartridge valve seventeen (C17) is connected to the oil tank through a proportional relief valve (YAA), and the outlet of the cartridge valve twenty-one (C21) is also connected to the inlet of the cartridge valve twenty-two (C22) through a high-frequency response proportional valve one (YAB), and the outlet of the cartridge valve twenty-two (C22) is connected to the oil tank.

3. The battery cooling plate forming hydraulic control system according to claim 2, characterized in that: The outlet of the cartridge valve 31 (C31) is also connected to the inlets of the cartridge valve 30 (C30) and the cartridge valve 32 (C32), the outlet of the cartridge valve 30 (C30) is connected to the oil tank, and the outlet of the cartridge valve 32 (C32) is connected to the oil tank through the high-frequency response proportional valve 3 (YAD); The outlet of the cartridge valve thirty-four (C34) is also connected to the inlet of the cartridge valve thirty-three (C33), and the outlet of the cartridge valve thirty-three (C33) is connected to the oil tank through the high-frequency response proportional valve two (YAC), and the hydraulic control ports of the high-frequency response proportional valve one (YAB), the high-frequency response proportional valve two (YAC) and the high-frequency response proportional valve three (YAD) are respectively connected to the outlet oil circuit of the auxiliary pump M6.

4. The battery cooling plate forming hydraulic control system according to claim 3, characterized in that: The main pressure oil circuit is also connected to the inlet of cartridge valve 26 (C26), and the outlet of cartridge valve 26 (C26) is connected to the inlet of cartridge valve 27 (C27) and cartridge valve 28 (C28) through cartridge valve 25 (C25); The outlet of the cartridge valve twenty-seven (C27) is connected to the P port of the solenoid valve twenty-eight (YA28), the A port of the solenoid valve twenty-eight (YA28) is connected to the lower hydraulic control port of the side cylinder filling valve, and the B port of the solenoid valve twenty-eight (YA28) is connected to the upper hydraulic control port of the side cylinder filling valve; The outlet of cartridge valve twenty-eight (C28) is connected to the P port of solenoid valve twenty-seven (YA27), the A port of solenoid valve twenty-seven (YA27) is connected to the lower hydraulic control port of the intermediate cylinder filling valve, and the B port of solenoid valve twenty-seven (YA27) is connected to the upper hydraulic control port of the intermediate cylinder filling valve.

5. The battery cooling plate forming hydraulic control system according to claim 4, characterized in that: The inlets of cartridge valve twenty-seven (C27) and cartridge valve twenty-eight (C28) are also connected to the oil port of the large accumulator (AC1), and the outlet oil circuit of the auxiliary pump M6 is provided with at least one small accumulator (AC2).

6. The battery cooling plate forming hydraulic control system according to claim 1, characterized in that: The main pressure oil circuit is also connected to the P ports of the electromagnetic valve 15 (YA15) and the electromagnetic valve 16 (YA16), the A port of the electromagnetic valve 15 (YA15) is connected to the hydraulic control port of the cartridge valve 24 (C24) through a shuttle valve, and the A port of the electromagnetic valve 16 (YA16) is connected to the hydraulic control port of the cartridge valve 21 (C21) through a shuttle valve; The outlet of the cartridge valve 20 (C20) is also connected to the P port of the solenoid valve 17 (YA17), and the A port of the solenoid valve 17 (YA17) is connected to the hydraulic control port of the cartridge valve 20 (C20); The outlet of the cartridge valve 18 (C18) is also connected to the P port of the solenoid valve 18 (YA18) through a one-way valve, and the A port of the solenoid valve 18 (YA18) is connected to the hydraulic control port of the cartridge valve 18 (C18); The outlet of the cartridge valve 18 (C18) is also connected to the P port of the solenoid valve 22 (YA22) through the throttle valve, and the B port and T port of the solenoid valve 22 (YA22) are connected to the oil tank.

7. The battery cooling plate forming hydraulic control system according to claim 2, characterized in that: The hydraulic control port of the cartridge valve 19 (C19) is connected to the P port of the solenoid valve 19 (YA19), and is also connected to the A port of the solenoid valve 19 (YA19) through the overflow valve, and the T port of the solenoid valve 19 (YA19) is connected to the oil tank; The hydraulic control port of the cartridge valve 22 (C22) is connected to the A port of the solenoid valve 20 (YA20), and the P port of the solenoid valve 20 (YA20) is connected to the inlet of the cartridge valve 22 (C22); The outlet of the cartridge valve 20 (C20) passes through the oil tank of the overflow valve and the solenoid valve 21 (YA21).

8. The battery cooling plate forming hydraulic control system according to claim 4, characterized in that: The hydraulic control port of the cartridge valve thirty-four (C34) is connected to the A port of the solenoid valve twenty-three (YA23), and the P port of the solenoid valve twenty-three (YA23) is connected to the inlet of the cartridge valve thirty-four (C34); The hydraulic control port of the cartridge valve 33 (C33) is connected to the A port of the solenoid valve 24 (YA24), and the P port of the solenoid valve 24 (YA24) is connected to the outlet of the cartridge valve 33 (C33); The hydraulic control port of the cartridge valve 32 (C32) is connected to the A port of the solenoid valve 25 (YA25), and the P port of the solenoid valve 25 (YA25) is connected to the outlet of the cartridge valve 32 (C32); The hydraulic control port of the cartridge valve 30 (C30) is connected to the A port of the solenoid valve 26 (YA26), and the P port of the solenoid valve 26 (YA26) is connected to the outlet of the cartridge valve 30 (C30); The hydraulic control port of the cartridge valve twenty-six (C26) is connected to the A port of the solenoid valve twenty-nine (YA29), and the P port of the solenoid valve twenty-nine (YA29) is connected to the inlet of the cartridge valve twenty-six (C26).

9. The battery cooling plate forming hydraulic control system according to any one of claims 1 to 8, characterized in that: The outlet oil circuit of the auxiliary pump M7 is connected to the P port of the three-position four-way reversing valve 1, the T port of the three-position four-way reversing valve 1 is connected to the oil tank, the A port and the B port of the three-position four-way reversing valve 1 are connected to the upper and lower chamber oil ports of the shifting platform lifting clamping cylinder (3) through the throttle valve (JK) and the hydraulic lock (DK), and the middle position function of the three-position four-way reversing valve 1 is Y-type.

10. The battery cooling plate forming hydraulic control system according to any one of claims 1 to 8, characterized in that:The outlet oil circuit of the auxiliary pump M7 is also connected to the P port of the three-position four-way reversing valve 2, the T port of the three-position four-way reversing valve 2 is connected to the oil tank, the A port and the B port of the three-position four-way reversing valve 2 are connected to the upper and lower chamber oil ports of the locking cylinder (4), and the middle position function of the three-position four-way reversing valve 2 is Y-type.

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