Hydraulic control system

Abstract

The utility model provides a hydraulic control system, and relates to the technical field of hydraulic control. The system comprises a first control valve, a second control valve, a third control valve, a first hydraulic cylinder, a second hydraulic cylinder, a third hydraulic cylinder and a fourth hydraulic cylinder, and working cavities of the first hydraulic cylinder and the third hydraulic cylinder are communicated with a first oil port of the third control valve through the first control valve and corresponding pipelines. And working cavities of the second hydraulic cylinder and the fourth hydraulic cylinder are communicated with a first oil port of the third control valve through a second control valve and a corresponding pipeline. According to the utility model, the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder and the fourth hydraulic cylinder which are used for corresponding clamps to clamp or loosen the movable mold are controlled in groups, namely, the first hydraulic cylinder and the third hydraulic cylinder are controlled through the first control valve, and the second hydraulic cylinder and the fourth hydraulic cylinder are controlled through the second control valve; redundant design of the hydraulic cylinder is achieved, the risk of single-point failure is avoided, and the fault handling capacity of a hydraulic control system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, in particular to a hydraulic control system. Background Art

[0002] In the industrial manufacturing process such as injection molding and die casting, the opening and closing of the mold and the removal of the product are important links in the production. In order to ensure that the mold remains reliably clamped during the working process, hydraulic clamps are usually used to achieve mold clamping control to prevent the mold from sliding or loosening during the production process, thereby ensuring production safety and product quality.

[0003] However, the existing hydraulic control systems for hydraulic clamps of molds usually adopt a single-valve design, that is, the drive of the hydraulic cylinders of multiple hydraulic clamps for the same mold is realized through one control valve. This design has the risk of single-point failure in actual use. For example, when the corresponding control valve fails (such as valve sticking, oil leakage, etc.), it may cause the multiple hydraulic cylinders corresponding to the control valve to lose the clamping force on the mold at the same time, thereby causing the mold to slip (slip), etc., affecting the product production quality and may even cause safety accidents. Utility Model Content

[0004] The problem solved by the utility model is: how to avoid the risk of single point failure and improve the ability of the hydraulic control system to cope with failures.

[0005] In order to solve the above problems, the utility model provides a hydraulic control system.

[0006] In the first aspect, the utility model provides a hydraulic control system, including a first control valve, a second control valve, a third control valve, a first hydraulic cylinder, a second hydraulic cylinder, a third hydraulic cylinder and a fourth hydraulic cylinder, wherein the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder and the fourth hydraulic cylinder are respectively used to drive the first clamp, the second clamp, the third clamp and the fourth clamp of the hydraulic clamp arranged on the movable plate, the first clamp and the third clamp are diagonally arranged on the movable plate, and the second clamp and the fourth clamp are diagonally arranged on the movable plate; the working chambers of the first hydraulic cylinder and the third hydraulic cylinder are connected to the first oil port of the third control valve through the first control valve and the corresponding pipeline, and the working chambers of the second hydraulic cylinder and the fourth hydraulic cylinder are connected to the first oil port of the third control valve through the second control valve and the corresponding pipeline.

[0007] Optionally, the hydraulic control system also includes a fourth control valve, a fifth control valve, a sixth control valve, a fifth hydraulic cylinder, a sixth hydraulic cylinder, a seventh hydraulic cylinder and an eighth hydraulic cylinder. The fifth hydraulic cylinder, the sixth hydraulic cylinder, the seventh hydraulic cylinder and the eighth hydraulic cylinder are respectively used to drive the fifth clamp, the sixth clamp, the seventh clamp and the eighth clamp of the hydraulic clamp which are arranged on the fixed plate. The fifth clamp and the seventh clamp are diagonally arranged on the fixed plate, and the sixth clamp and the eighth clamp are diagonally arranged on the fixed plate; the working chambers of the fifth hydraulic cylinder and the seventh hydraulic cylinder are connected to the first oil port of the sixth control valve through the fourth control valve and the corresponding pipeline, and the working chambers of the sixth hydraulic cylinder and the eighth hydraulic cylinder are connected to the first oil port of the sixth control valve through the fifth control valve and the corresponding pipeline.

[0008] Optionally, the hydraulic control system also includes a hydraulic pump, an oil tank and a seventh control valve, the second oil port of the third control valve is connected to the first working port of the seventh control valve through a corresponding pipeline, the second oil port of the sixth control valve is connected to the second working port of the seventh control valve through a corresponding pipeline, the first oil inlet port of the seventh control valve is connected to the interior of the oil tank through the hydraulic pump and the first pipeline, and the first oil return port of the seventh control valve is connected to the interior of the oil tank through the second pipeline.

[0009] Optionally, the hydraulic control system further includes a one-way valve, which is disposed on the first pipeline and located between the first oil inlet and the hydraulic pump.

[0010] Optionally, the hydraulic control system further comprises a relief valve, a second oil inlet of the relief valve is connected between the one-way valve and the hydraulic pump and communicated with the first pipeline; a second oil return port of the relief valve is connected and communicated with the second pipeline.

[0011] Optionally, the hydraulic control system further comprises a pressure measuring mechanism, which is used to be arranged at at least one of the first working port, the second working port, the working port and the first oil return port of the seventh control valve.

[0012] Optionally, the hydraulic control system further comprises an alarm mechanism communicatively connected to the pressure measuring mechanism.

[0013] Optionally, the first control valve, the second control valve and the third control valve all adopt two-position two-way valves, and the two-position two-way valves are provided with the first oil port and the second oil port. The two-position two-way valves are used for unidirectional conduction from the second oil port to the first oil port when power is off, or for bidirectional conduction from the second oil port to the first oil port when power is on.

[0014] Optionally, the fourth control valve, the fifth control valve and the sixth control valve all adopt two-position two-way valves, and the two-position two-way valves are provided with the first oil port and the second oil port. The two-position two-way valve is used for unidirectional conduction from the second oil port to the first oil port when power is off, or for bidirectional conduction from the second oil port to the first oil port when power is on.

[0015] Optionally, the seventh control valve comprises a three-position four-way valve.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the hydraulic control system of the utility model controls the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder and the fourth hydraulic cylinder used to drive the corresponding clamps to clamp or release the movable mold in groups, that is, the first hydraulic cylinder and the third hydraulic cylinder are controlled by the first control valve, and the second hydraulic cylinder and the fourth hydraulic cylinder are controlled by the second control valve, so as to realize the redundant design of the hydraulic cylinder, avoid the risk of single point failure, and improve the ability of the hydraulic control system to cope with failures. And the two hydraulic cylinders in each group are arranged diagonally to ensure that in the normal operation of the hydraulic control system, the movable mold can be uniformly applied with force through the corresponding two clamps arranged diagonally, and the movable mold can be uniformly stressed, and when the two hydraulic cylinders in a certain group fail (such as due to the failure of the corresponding control valve), the two hydraulic cylinders in another group can still provide effective support and driving force to the movable mold based on the corresponding two clamps arranged diagonally, and ensure that the movable mold is balanced in force. In this way, while avoiding the risk of single-point failure, it can effectively ensure that the dynamic mold is balanced in force, avoid deformation of the mold or positioning offset due to uneven force on one side of the dynamic mold, improve the stability of the dynamic mold movement and processing accuracy, thereby improving the stability and processing accuracy of the production and processing of the hydraulic control system corresponding to the hydraulic molding equipment. In addition, the action of the corresponding hydraulic cylinder is directly controlled by the first control valve and the second control valve, and the response speed is faster. The first control valve and the second control valve are coordinated and controlled by the third control valve, which improves the overall control efficiency of the hydraulic control system. In this way, hierarchical control is realized. This hierarchical control method optimizes the control logic of the hydraulic control system while reducing the load of the control valves at all levels: and the first control valve and the second control valve are uniformly controlled by the third control valve to realize the unified oil supply or oil return of the grouped hydraulic cylinders, which reduces the driving difficulty for each hydraulic cylinder and improves the convenience of driving each hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a hydraulic control system in an embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the connection between the static mold and the fixed plate and the connection between the dynamic mold and the dynamic plate in the embodiment of the utility model;

[0019] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0020] Reference numerals:

[0021] 11. First hydraulic cylinder; 12. Second hydraulic cylinder; 13. Third hydraulic cylinder; 14. Fourth hydraulic cylinder; 15. Fifth hydraulic cylinder; 16. Sixth hydraulic cylinder; 17. Seventh hydraulic cylinder; 18. Eighth hydraulic cylinder; 21. First control valve; 22. Second control valve; 23. Third control valve; 24. Fourth control valve; 25. Fifth control valve; 26. Sixth control valve; 27. Seventh control valve; 28. One-way valve; 29. ​​Overflow valve; 30. Hydraulic pump; 40. Oil tank; 51. First pipeline; 52. Second pipeline; 61. First fixture; 62. Second fixture; 63. Third fixture; 64. Fourth fixture; 65. Fifth fixture; 66. Sixth fixture; 67. Seventh fixture; 68. Eighth fixture; 71. Static mold; 72. Moving mold; 81. Fixed plate; 82. Moving plate; 91. Base; 92. Press block. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0024] Combination Figure 1 , Figure 2 As shown, the embodiment of the utility model provides a hydraulic control system, including a first control valve 21, a second control valve 22, a third control valve 23, a first hydraulic cylinder 11, a second hydraulic cylinder 12, a third hydraulic cylinder 13 and a fourth hydraulic cylinder 14, the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13 and the fourth hydraulic cylinder 14 are respectively used to drive the first clamp 61, the second clamp 62, the third clamp 63 and the fourth clamp 64 arranged on the movable plate 82 of the hydraulic clamp, the first clamp 61 and the third clamp 63 are diagonally arranged on the movable plate 82, and the second clamp 62 and the fourth clamp 64 are diagonally arranged on the movable plate 82;

[0025] The working chambers of the first hydraulic cylinder 11 and the third hydraulic cylinder 13 are connected to the first oil port of the third control valve 23 through the first control valve 21 and the corresponding pipelines, and the working chambers of the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 are connected to the first oil port of the third control valve 23 through the second control valve 22 and the corresponding pipelines.

[0026] In this embodiment, the hydraulic control system drives the corresponding hydraulic cylinder to drive the hydraulic clamp corresponding to the hydraulic cylinder, thereby fixing the mold (such as the movable mold 72 and the static mold 71) of the hydraulic molding equipment on the mold carrier by clamping the hydraulic clamp, or disassembling the mold on the mold carrier by loosening the hydraulic clamp, so as to achieve rapid mold change (i.e., rapid mold replacement), thereby effectively improving production efficiency. Among them, the mold of the hydraulic molding equipment (such as an injection molding machine or a die-casting machine, etc., an industrial equipment that realizes the production and manufacturing of the corresponding workpiece through hydraulic pressure) includes a static mold 71 and a dynamic mold 72, and the hydraulic molding equipment drives the static mold 71 and the dynamic mold 72 to move relative to each other to realize mold motion control, so as to process and shape the raw materials set between the static mold 71 and the dynamic mold 72.

[0027] The hydraulic clamp at least includes a movable plate 82 as a carrier of the movable mold 72, and a first clamp 61, a second clamp 62, a third clamp 63, and a fourth clamp 64. The first clamp 61, the second clamp 62, the third clamp 63, and the fourth clamp 64 are detachably connected to the movable plate 82 respectively; the movable mold 72 of the hydraulic molding equipment is clamped on the movable plate 82 by the first clamp 61, the second clamp 62, the third clamp 63, and the fourth clamp 64, so that the movable mold 72 is fixed on the movable plate 82. When the hydraulic molding equipment is running, the movable mold 72 is driven by driving the movable plate 82 to move. On the movable plate 82, the first clamp 61 and the third clamp 63 are diagonally arranged on the movable plate 82, and the second clamp 62 and the fourth clamp 64 are diagonally arranged on the movable plate 82, so that the first clamp 61, the second clamp 62, the third clamp 63, and the fourth clamp 64 can stably clamp the movable mold 72 from the four corners (or near the four corners) of the movable mold 72. Correspondingly, in the hydraulic control system, a hydraulic cylinder is provided for driving each clamp (i.e., the first clamp 61, the second clamp 62, the third clamp 63, and the fourth clamp 64) to realize clamping or loosening. Specifically, the first hydraulic cylinder 11 is used to drive the first clamp 61, the second hydraulic cylinder 12 is used to drive the second clamp 62, the third hydraulic cylinder 13 is used to drive the third clamp 63, and the fourth hydraulic cylinder 14 is used to drive the fourth clamp 64. That is to say, the first hydraulic cylinder 11 and the third hydraulic cylinder 13 are diagonally arranged on the movable plate 82, and the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 are diagonally arranged on the movable plate 82, wherein the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13, and the fourth hydraulic cylinder 14 are connected to the corresponding clamps through plunger rods (or piston rods) so as to realize smooth and stable driving of the corresponding clamps. For the diagonal arrangement, exemplarily, in combination with Figure 2 As shown, the cross section of the movable plate 82 (such as the surface exposed when the movable plate 82 is cut by a plane perpendicular to the moving direction of the movable plate 82 when it is driven) is rectangular or quasi-rectangular, the diagonally arranged first hydraulic cylinder 11 and the third hydraulic cylinder 13 are respectively located at two opposite vertices (or near the vertices) of the rectangle, and the diagonally arranged second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 are respectively located at the other two opposite vertices (or near the vertices) of the rectangle. For example, assuming that the four vertices of the rectangle are a, b, c, and d, respectively, if the first hydraulic cylinder 11 is set at vertex a, the third hydraulic cylinder 13 is set at vertex c, that is, the first hydraulic cylinder 11 and the third hydraulic cylinder 13 are respectively located at the two ends (or near) of the diagonal line ac of the rectangle; similarly, if the second hydraulic cylinder 12 is set at vertex b, the fourth hydraulic cylinder 14 is set at vertex d, that is, the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 are respectively located at the two ends (or near) of the diagonal line bd of the rectangle.

[0028] The working chambers of the first hydraulic cylinder 11 and the third hydraulic cylinder 13 are both connected to the first oil port of the third control valve 23 through the first control valve 21 and the corresponding pipelines, and the working chambers of the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 are both connected to the first oil port of the third control valve 23 through the second control valve 22 and the corresponding pipelines. That is to say, the oil supply and oil return of the working chambers of the first hydraulic cylinder 11 and the third hydraulic cylinder 13 are directly controlled by the first control valve 21, and the oil supply and oil return of the working chambers of the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 are directly controlled by the second control valve 22, thereby realizing group control of the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13 and the fourth hydraulic cylinder 14, avoiding the risk of all hydraulic cylinders losing their force at the same time due to a failure of one of the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13 and the fourth hydraulic cylinder 14, or due to a failure of one of the first control valve 21 and the second control valve 22, that is, avoiding the risk of single point failure and improving the ability of the hydraulic control system to cope with failures. Moreover, by allocating the first hydraulic cylinder 11 and the third hydraulic cylinder 13 to the first control valve 21 for control, and allocating the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 to the second control valve 22 for control, the oil supply and return paths of the hydraulic cylinder groups are independent in the hydraulic oil circuit, thereby reducing mutual interference within the hydraulic control system and improving the stability and response speed of the hydraulic cylinder motion control; and facilitating the maintenance and fault diagnosis of the hydraulic control system. For example, when a group of hydraulic cylinders or their control valves fail, only the faulty group needs to be checked and repaired without completely shutting down or overhauling the entire hydraulic control system, which significantly improves the maintenance efficiency and operation continuity of the hydraulic control system and provides an important guarantee for efficient production.

[0029] In addition, the third control valve 23 is used to distribute and adjust the oil supply and return paths of the first control valve 21 and the second control valve 22 in the hydraulic control system. The first oil port is connected to the first control valve 21 and the second control valve 22 through corresponding pipelines, and the second oil port is used to connect to the oil tank 40, so as to facilitate the unified oil supply or oil return of the grouped hydraulic cylinders, reduce the driving difficulty of each hydraulic cylinder, and improve the convenience of driving each hydraulic cylinder. For example, the third control valve 23 can switch different working states according to the control signal. In the first state, the hydraulic oil from the oil tank 40 is allowed to flow to the first control valve 21 and the second control valve 22 through the second oil port and the first oil port, so as to provide oil supply to the first hydraulic cylinder 11, the third hydraulic cylinder 13 and the second hydraulic cylinder 12, the fourth hydraulic cylinder 14 at the same time; in the second state, the return oil of the first control valve 21 and the second control valve 22 is recovered through the first oil port, and it is guided to the oil tank 40 through the second oil port.

[0030] In this way, the hydraulic control system controls the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13 and the fourth hydraulic cylinder 14 used to drive the corresponding clamps to clamp or release the movable mold 72 in groups, that is, the first hydraulic cylinder 11 and the third hydraulic cylinder 13 are controlled by the first control valve 21, and the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 are controlled by the second control valve 22, so as to realize the redundant design of the hydraulic cylinders, avoid the risk of single point failure, and improve the ability of the hydraulic control system to cope with failures. In addition, the two hydraulic cylinders in each group are arranged diagonally to ensure that in the normal operation of the hydraulic control system, the movable mold 72 can be uniformly applied with force through the corresponding two clamps arranged diagonally, and the movable mold 72 can be uniformly stressed, and when the two hydraulic cylinders in a certain group fail (such as due to the failure of the corresponding control valve), the two hydraulic cylinders in the other group can still provide effective support and driving force to the movable mold 72 based on the corresponding two clamps arranged diagonally, and ensure that the movable mold 72 is balanced in force. In this way, while avoiding the risk of single point failure, it can effectively ensure that the dynamic mold 72 is subjected to balanced force, avoid deformation of the mold or positioning offset caused by uneven force on one side of the dynamic mold 72, improve the stability and processing accuracy of the movement of the dynamic mold 72, and thus improve the stability and processing accuracy of the production and processing of the hydraulic molding equipment corresponding to the hydraulic control system. In addition, the action of the corresponding hydraulic cylinder is directly controlled by the first control valve 21 and the second control valve 22, and the response speed is faster. The first control valve 21 and the second control valve 22 are coordinated and controlled by the third control valve 23, which improves the overall control efficiency of the hydraulic control system. In this way, hierarchical control is realized. This hierarchical control method optimizes the control logic of the hydraulic control system while reducing the load of the control valves at all levels: and the first control valve 21 and the second control valve 22 are uniformly controlled by the third control valve 23, so as to realize the unified oil supply or oil return of the grouped hydraulic cylinders, reduce the driving difficulty for each hydraulic cylinder, and improve the convenience of driving each hydraulic cylinder.

[0031] Optionally, combined Figure 1 , Figure 2 As shown, the hydraulic control system further includes a fourth control valve 24, a fifth control valve 25, a sixth control valve 26, a fifth hydraulic cylinder 15, a sixth hydraulic cylinder 16, a seventh hydraulic cylinder 17 and an eighth hydraulic cylinder 18, the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18 are respectively used to drive the fifth clamp 65, the sixth clamp 66, the seventh clamp 67 and the eighth clamp 68 of the hydraulic clamps arranged on the fixed plate 81, the fifth clamp 65 and the seventh clamp 67 are diagonally arranged on the fixed plate 81, and the sixth clamp 66 and the eighth clamp 68 are diagonally arranged on the fixed plate 81;

[0032] The working chambers of the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 are connected to the first oil port of the sixth control valve 26 through the fourth control valve 24 and the corresponding pipelines, and the working chambers of the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 are connected to the first oil port of the sixth control valve 26 through the fifth control valve 25 and the corresponding pipelines.

[0033] In this embodiment, the hydraulic clamp includes a movable plate 82 as a carrier of the movable mold 72 and a first clamp 61, a second clamp 62, a third clamp 63, and a fourth clamp 64, and the hydraulic clamp also includes a fixed plate 81 as a carrier of the static mold 71 and a fifth clamp 65, a sixth clamp 66, a seventh clamp 67, and an eighth clamp 68, and the fifth clamp 65, the sixth clamp 66, the seventh clamp 67, and the eighth clamp 68 are detachably connected to the fixed plate 81 respectively; the static mold 71 of the hydraulic molding device is clamped on the fixed plate 81 by the fifth clamp 65, the sixth clamp 66, the seventh clamp 67, and the eighth clamp 68, so that the static mold 71 is fixed on the fixed plate 81. When the hydraulic molding device is running, the movable plate 82 is driven to move relative to the fixed plate 81, so that the relative movement between the movable mold 72 and the static mold 71 is realized, and the corresponding production process of the hydraulic molding device is realized. On the fixed plate 81, the fifth clamp 65 and the seventh clamp 67 are diagonally arranged on the fixed plate 81, and the sixth clamp 66 and the eighth clamp 68 are diagonally arranged on the fixed plate 81, so that the fifth clamp 65, the sixth clamp 66, the seventh clamp 67, and the eighth clamp 68 can stably clamp the static mold 71 from the four corners (or near the four corners) of the static mold 71. Among them, the position of the static mold 71 of the hydraulic clamp can be relatively fixed, and the position of the movable mold 72 can be changed; or, the positions of the static mold 71 and the movable mold 72 of the hydraulic clamp can be changed to meet the needs of different production processes.

[0034] Correspondingly, in the hydraulic control system, a hydraulic cylinder is provided for driving each clamp (i.e., the fifth clamp 65, the sixth clamp 66, the seventh clamp 67, and the eighth clamp 68) to realize clamping or loosening action. Specifically, the fifth hydraulic cylinder 15 is used to drive the fifth clamp 65, the sixth hydraulic cylinder 16 is used to drive the sixth clamp 66, the seventh hydraulic cylinder 17 is used to drive the seventh clamp 67, and the eighth hydraulic cylinder 18 is used to drive the eighth clamp 68. That is to say, the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 are diagonally arranged on the fixed plate 81, and the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 are diagonally arranged on the fixed plate 81, wherein the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18 are connected to the corresponding clamps through plunger rods (or piston rods) so as to realize smooth and stable driving of the corresponding clamps. The working chambers of the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 are both connected to the first oil port of the sixth control valve 26 through the fourth control valve 24 and the corresponding pipelines, and the working chambers of the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 are both connected to the first oil port of the sixth control valve 26 through the fifth control valve 25 and the corresponding pipelines. That is to say, the oil supply and oil return of the working chambers of the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 are directly controlled by the fourth control valve 24, and the oil supply and oil return of the working chambers of the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 are directly controlled by the fifth control valve 25, thereby realizing the group control of the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18, avoiding the risk of all hydraulic cylinders losing their force at the same time due to a failure of one of the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18, or due to a failure of one of the fourth control valve 24 and the fifth control valve 25, that is, avoiding the risk of single point failure and improving the ability of the hydraulic control system to cope with failures. Moreover, by allocating the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 to the fourth control valve 24 for control, and allocating the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 to the fifth control valve 25 for control, the oil supply and return paths of the hydraulic cylinder groups can be independent in the hydraulic oil circuit, thereby reducing mutual interference within the hydraulic control system and improving the stability and response speed of the hydraulic cylinder motion control; and facilitating the maintenance and fault diagnosis of the hydraulic control system. For example, when a group of hydraulic cylinders or their control valves fail, only the faulty group needs to be checked and repaired without shutting down or overhauling the entire hydraulic control system, which significantly improves the maintenance efficiency and operation continuity of the hydraulic control system and provides an important guarantee for efficient production. In addition, in the present embodiment, the oil supply and return paths of the fourth control valve 24 and the fifth control valve 25 are distributed and adjusted in the hydraulic control system through the sixth control valve 26, and the first oil port is connected to the fourth control valve 24 and the fifth control valve 25 through corresponding pipelines, respectively, and the second oil port is used to connect to the oil tank 40, thereby facilitating the unified oil supply or oil return of the grouped hydraulic cylinders, reducing the driving difficulty of each hydraulic cylinder, and improving the convenience of driving each hydraulic cylinder.Exemplarily, the sixth control valve 26 can switch to different working states according to the control signal. In the first state, the hydraulic oil from the oil tank 40 is allowed to flow to the fourth control valve 24 and the fifth control valve 25 via the second oil port and the first oil port, so as to provide oil supply to the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18 at the same time; in the second state, the return oil of the fourth control valve 24 and the fifth control valve 25 is recovered through the first oil port, and guided to the oil tank 40 through the second oil port.

[0035] Among them, for the diagonal setting, exemplarily, combined with Figure 2 As shown, the cross-section of the fixed plate 81 (such as the surface exposed when the fixed plate 81 is cut by a plane perpendicular to the moving direction of the fixed plate 81 when it is driven) is rectangular or quasi-rectangular, the diagonally arranged fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 are respectively located at two opposite vertices (or near the vertices) of the rectangle, and the diagonally arranged sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 are respectively located at the other two opposite vertices (or near the vertices) of the rectangle. For example, assuming that the four vertices of the rectangle are e, f, g, and h, respectively, if the fifth hydraulic cylinder 15 is set at the vertex e, the seventh hydraulic cylinder 17 is set at the vertex g, that is, the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 are respectively located at the two ends (or near) of the diagonal line eg of the rectangle; similarly, if the sixth hydraulic cylinder 16 is set at the vertex f, the eighth hydraulic cylinder 18 is set at the vertex h, that is, the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 are respectively located at the two ends (or near) of the diagonal line fh of the rectangle.

[0036] In this way, the hydraulic control system realizes the clamping and loosening of the movable mold 72 by means of the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13, the fourth hydraulic cylinder 14, the first clamp 61, the second clamp 62, the third clamp 63 and the fourth clamp 64, and realizes the clamping and loosening of the static mold 71 by means of the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17, the eighth hydraulic cylinder 18, the fifth clamp 65, the sixth clamp 66, the seventh clamp 67, the eighth clamp 68, the fifth clamp 65, and the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18 for driving the fifth clamp 65, the sixth clamp 66, the seventh clamp 67 and the eighth clamp 68 are grouped and controlled, that is, the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 are controlled by the fourth control valve 24, and the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 are controlled by the sixth control valve 26, so as to realize the redundant design of the hydraulic cylinders, avoid the risk of single point failure, and improve the ability of the hydraulic control system to cope with failures. And the two hydraulic cylinders in each group are arranged diagonally to ensure that in the normal operation of the hydraulic control system, the static mold 71 can be uniformly applied with force through the corresponding two diagonally arranged clamps, and the static mold 71 can be uniformly stressed, and when the two hydraulic cylinders in a group fail (such as due to the failure of the corresponding control valve), the two hydraulic cylinders in the other group can still provide effective support and driving force to the static mold 71 based on the corresponding two diagonally arranged clamps, and ensure that the static mold 71 is balanced in force. In this way, while avoiding the risk of single point failure, it can effectively ensure that the static mold 71 is subjected to balanced force, avoid deformation of the mold or positioning deviation due to uneven force on one side of the static mold 71, improve the stability and processing accuracy of the movement of the static mold 71, and thus improve the stability and processing accuracy of the production and processing of the hydraulic control system corresponding to the hydraulic molding equipment. In addition, the fourth control valve 24 and the fifth control valve 25 are uniformly controlled by the sixth control valve 26 to achieve unified oil supply or oil return of the grouped hydraulic cylinders, so as to reduce the driving difficulty of each hydraulic cylinder and improve the convenience of driving each hydraulic cylinder.

[0037] Optionally, combined Figure 1 As shown, the hydraulic control system also includes a hydraulic pump 30, an oil tank 40 and a seventh control valve 27. The second oil port of the third control valve 23 is connected to the first working port of the seventh control valve 27 through a corresponding pipeline. The second oil port of the sixth control valve 26 is connected to the second working port of the seventh control valve 27 through a corresponding pipeline. The first oil inlet of the seventh control valve 27 is connected to the interior of the oil tank 40 through the hydraulic pump 30 and the first pipeline 51. The first oil return port of the seventh control valve 27 is connected to the interior of the oil tank 40 through the second pipeline 52.

[0038] In this embodiment, the seventh control valve 27 serves as the central distribution unit of the hydraulic control system, and its first working port (such as Figure 1A) is connected to the second oil port of the third control valve 23 through a corresponding pipeline, and the second working port (such as Figure 1 B) is connected to the second oil port of the sixth control valve 26 through a corresponding pipeline to realize independent distribution and coordination of the oil supply and return of the third control valve 23 and the sixth control valve 26. Through the coordination of the seventh control valve 27, hydraulic oil can be provided to the third control valve 23 and the sixth control valve 26 or the return oil can be recovered, effectively reducing the mutual interference between the control valves, improving the stability and response speed of the hydraulic control system, thereby ensuring that the action of the hydraulic cylinder is more accurate and efficient, and realizing efficient operation of the hydraulic control system.

[0039] The oil inlet of the hydraulic pump 30 is connected to the inside of the oil tank 40 (which is used to store hydraulic oil) through a corresponding pipeline (referred to as the first pipeline 51), and the oil outlet of the hydraulic pump 30 is connected to the first oil inlet of the seventh control valve 27 (such as Figure 1 P1) is connected so as to provide hydraulic oil from the oil tank 40 to the corresponding hydraulic cylinder of the hydraulic control system through the corresponding pipeline and control valve; the oil supply of the hydraulic pump 30 to the corresponding hydraulic cylinder is adjusted through the corresponding control valve of the hydraulic control system to meet the working requirements of the hydraulic cylinder and the hydraulic fixture. Exemplarily, the hydraulic pump 30 extracts hydraulic oil from the oil tank 40 and delivers the hydraulic oil to the hydraulic control system after pressurization; the output pressure of the hydraulic pump 30 is controlled by the preset working parameters to ensure that the working pressure range required by the hydraulic cylinder is met, so that the hydraulic cylinder can complete the corresponding action, such as driving the mold 72 to move, position or maintain a specific position.

[0040] Moreover, the first oil return port (such as Figure 1 T1) is connected to the inside of the oil tank 40 through a corresponding pipeline (recorded as the second pipeline 52) to transport the hydraulic oil refluxed in the hydraulic control system back to the oil tank 40, so as to realize the recycling and pressure regulation of the hydraulic oil. During the operation of the hydraulic control system, after the hydraulic oil completes the action through each control valve and the hydraulic cylinder, part of the hydraulic oil returns to the seventh control valve 27 through the corresponding pipeline, and is guided to the oil tank 40 by the first oil return port of the seventh control valve 27. In this way, the energy loss of the hydraulic oil is effectively reduced, the overload risk caused by pressure accumulation in the hydraulic control system is avoided, and the long-term stable operation of the hydraulic control system is ensured.

[0041] Optionally, combined Figure 1 As shown, the hydraulic control system further includes a one-way valve 28 , which is disposed on the first pipeline 51 and located between the first oil inlet and the hydraulic pump 30 .

[0042] In this embodiment, the hydraulic control system further includes a one-way valve 28 for optimizing the flow path of the hydraulic oil. Specifically, the one-way valve 28 is installed on the first pipeline 51, between the hydraulic pump 30 and the first oil inlet of the seventh control valve 27, and its function is to ensure the one-way flow of the hydraulic oil (i.e., from the oil outlet of the hydraulic pump 30 to the first oil inlet of the seventh control valve 27) when the hydraulic pump 30 supplies oil to the hydraulic control system, and prevent the hydraulic oil from flowing back to the hydraulic pump 30, thereby avoiding damage to the hydraulic pump 30. In other words, the provision of the one-way valve 28 improves the oil supply stability and safety of the hydraulic control system.

[0043] Optionally, combined Figure 1 As shown, the hydraulic control system also includes a relief valve 29 , a second oil inlet of the relief valve 29 is connected between the one-way valve 28 and the hydraulic pump 30 , and communicates with the first pipeline 51 ; a second oil return port of the relief valve 29 is connected and communicated with the second pipeline 52 .

[0044] In this embodiment, the hydraulic control system further includes a relief valve 29 for optimizing the flow path of the hydraulic oil and providing pressure protection. Specifically, the relief valve 29 is used to connect the first pipeline 51 and the second pipeline 52, and the oil inlet of the relief valve 29 (referred to as the second oil inlet, such as Figure 1 The oil return port of the relief valve 29 (denoted as the second oil return port, as shown in FIG. Figure 1 In this way, when the pressure of the hydraulic oil provided by the hydraulic pump 30 exceeds the preset value, the relief valve 29 opens and discharges the excess hydraulic oil back to the oil tank 40 through its second oil return port and the second pipeline 52, thereby protecting the hydraulic cylinder and pipeline in the hydraulic control system and avoiding equipment damage caused by excessive pressure. At the same time, the design of the relief valve 29 helps to maintain the pressure stability inside the hydraulic control system and ensure the stability and responsiveness of the hydraulic cylinder action.

[0045] In this way, through the combination of the one-way valve 28 and the overflow valve 29, the hydraulic control system further has an overpressure protection function on the basis of realizing one-way transmission of hydraulic oil, which can significantly improve the operating safety and reliability of the hydraulic control system, extend the service life of the hydraulic control system, and facilitate the maintenance and management of the hydraulic control system.

[0046] Optionally, the hydraulic control system further includes a pressure measuring mechanism, which is used to be arranged at at least one of the first working port, the second working port, the working port and the first oil return port of the seventh control valve 27 .

[0047] In this embodiment, the pressure measuring mechanism of the hydraulic control system is used to monitor the oil pressure at key positions in the hydraulic control system in real time, and improve the controllability and safety of the operation of the hydraulic control system. Specifically, the pressure measuring mechanism can be selectively installed at any one or more positions of the first working port, the second working port, the first oil inlet and the first oil return port of the seventh control valve 27. In some embodiments, the pressure measuring mechanism directly connects to the corresponding oil circuit, collects oil pressure data in real time, and feeds the data back to the control unit of the hydraulic control system, so as to realize real-time monitoring of the oil pressure at the corresponding position.

[0048] When the pressure measuring mechanism is set at the first working port of the seventh control valve 27, it can be used to monitor the pressure of the hydraulic oil when it flows to the third control valve 23, which is helpful to evaluate the pressure state of the corresponding oil supply path and the working state of the corresponding hydraulic cylinder. When the pressure measuring mechanism is set at the second working port of the seventh control valve 27, it can be used to monitor the pressure of the hydraulic oil when it flows to the sixth control valve 26, which is helpful to evaluate the pressure state of the corresponding oil supply path and the working state of the corresponding hydraulic cylinder. When the pressure measuring mechanism is set at the first oil inlet of the seventh control valve 27, the hydraulic oil pressure provided by the hydraulic pump 30 to the seventh control valve 27 can be monitored in real time to ensure that the oil supply pressure is stable within the preset range and meet the operation requirements of the hydraulic control system. When the pressure measuring mechanism is set at the first oil return port of the seventh control valve 27, the pressure of the oil return path in the hydraulic control system can be monitored to ensure smooth oil return and avoid oil return blockage caused by abnormal pressure.

[0049] In this way, by introducing a pressure measuring mechanism into the hydraulic control system, real-time monitoring and adjustment of the hydraulic oil pressure can be achieved. When the pressure measuring mechanism detects that the pressure exceeds the preset range, the control unit of the hydraulic control system connected to the pressure measuring mechanism can promptly issue an alarm or take corresponding measures, such as adjusting the output of the hydraulic pump 30 or triggering the overflow valve 29 to operate, thereby effectively preventing damage to the hydraulic cylinder and other components caused by abnormal system pressure, improving the operating reliability and safety of the hydraulic control system, and improving the convenience of maintenance and fault diagnosis of the hydraulic control system.

[0050] Optionally, the hydraulic control system further comprises an alarm mechanism communicatively connected to the pressure measuring mechanism.

[0051] In this embodiment, the hydraulic control system further includes an alarm mechanism that is communicatively connected to the pressure measuring mechanism, and the alarm mechanism is used to compare the pressure data monitored by the pressure measuring mechanism with the preset standard pressure to evaluate whether the pressure state of the corresponding position of the seventh control valve 27 is normal. For example, when the monitored pressure data exceeds the corresponding preset pressure standard, the alarm mechanism performs an audible and visual alarm to promptly promote the intervention of corresponding personnel to ensure the safe operation of the hydraulic control system.

[0052] Optionally, the first control valve 21, the second control valve 22 and the third control valve 23 all adopt two-position two-way valves, which are provided with a first oil port and a second oil port. The two-position two-way valves are used for unidirectional conduction from the second oil port to the first oil port when power is off, or for bidirectional conduction from the second oil port to the first oil port when power is on.

[0053] In this embodiment, the first control valve 21, the second control valve 22, and the third control valve 23 of the hydraulic control system are all two-position two-way valves to achieve efficient control and flexible distribution of hydraulic oil in the system. The two-position two-way valve has two working states, and its switching is controlled by an electrical signal to achieve unidirectional conduction or bidirectional conduction of the hydraulic oil.

[0054] Specifically, when the two-position two-way valve is in the power-off state, its internal structure is designed to enable the second oil port and the first oil port to achieve one-way communication, that is, the hydraulic oil can only flow from the second oil port to the first oil port, and cannot flow in the opposite direction. In some embodiments, when the two-position two-way valve is powered off, the one-way communication from the second oil port to the first oil port is achieved by a one-way valve structure, which can automatically open under specific pressure conditions to allow the hydraulic oil to flow from the second oil port to the first oil port, while preventing the hydraulic oil from flowing in the opposite direction. When the two-position two-way valve is in the power-on state, the second oil port and the first oil port achieve two-way communication, that is, the hydraulic oil can flow freely between the two oil ports, and the hydraulic oil reflux adjustment or pressure relief can be performed in this state. In this way, by controlling the power-on and power-off state of the two-position two-way valve, the flow direction and flow rate of the hydraulic oil in different oil circuits can be flexibly adjusted to meet the needs of multiple working modes of the hydraulic control system.

[0055] In this way, the use of a two-position two-way valve as an important control valve in the hydraulic control system can not only simplify the valve body structure and reduce the manufacturing and use costs, but also achieve a rapid response to the corresponding control instructions through electrical signal control, thereby improving the operating efficiency of the hydraulic control system. At the same time, it can maintain a one-way flow of hydraulic oil when the power is off, thereby ensuring the basic safety of the system in the event of a power outage or failure, and avoiding accidents caused by hydraulic oil backflow or abnormal pressure. In addition, the standardized design of the two-position two-way valve facilitates subsequent maintenance and replacement, helps reduce the difficulty of repairing the hydraulic control system, and improves the stability and reliability of the hydraulic control system.

[0056] Optionally, the fourth control valve 24, the fifth control valve 25 and the sixth control valve 26 all adopt a two-position two-way valve, which is provided with a first oil port and a second oil port. The two-position two-way valve is used for unidirectional conduction from the second oil port to the first oil port when power is off, or for bidirectional conduction from the second oil port to the first oil port when power is on.

[0057] In this embodiment, the fourth control valve 24, the fifth control valve 25 and the sixth control valve 26 of the hydraulic control system are all two-position two-way valves to achieve efficient control and flexible distribution of hydraulic oil in the system. The two-position two-way valve has two working states, and its switching is controlled by an electrical signal to achieve unidirectional conduction or bidirectional conduction of the hydraulic oil.

[0058] Specifically, when the two-position two-way valve is in the power-off state, its internal structure is designed to enable the second oil port and the first oil port to achieve one-way communication, that is, the hydraulic oil can only flow from the second oil port to the first oil port, and cannot flow in the opposite direction. In some embodiments, when the two-position two-way valve is powered off, the one-way communication from the second oil port to the first oil port is achieved by a one-way valve structure, which can automatically open under specific pressure conditions to allow the hydraulic oil to flow from the second oil port to the first oil port, while preventing the hydraulic oil from flowing in the opposite direction. When the two-position two-way valve is in the power-on state, the second oil port and the first oil port achieve two-way communication, that is, the hydraulic oil can flow freely between the two oil ports, and the hydraulic oil reflux adjustment or pressure relief can be performed in this state. In this way, by controlling the power-on and power-off state of the two-position two-way valve, the flow direction and flow rate of the hydraulic oil in different oil circuits can be flexibly adjusted to meet the needs of multiple working modes of the hydraulic control system.

[0059] In this way, the use of a two-position two-way valve as an important control valve in the hydraulic control system can not only simplify the valve body structure and reduce the manufacturing and use costs, but also achieve a rapid response to the corresponding control instructions through electrical signal control, thereby improving the operating efficiency of the hydraulic control system. At the same time, it can maintain a one-way flow of hydraulic oil when the power is off, thereby ensuring the basic safety of the system in the event of a power outage or failure, and avoiding accidents caused by hydraulic oil backflow or abnormal pressure. In addition, the standardized design of the two-position two-way valve facilitates subsequent maintenance and replacement, helps reduce the difficulty of repairing the hydraulic control system, and improves the stability and reliability of the hydraulic control system.

[0060] Optionally, the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13 and the fourth hydraulic cylinder 14, as well as the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18 all adopt plunger cylinders, and a spring is provided between the plunger and the cylinder body of the plunger cylinder, and the spring is sleeved on the plunger rod of the plunger cylinder. In this way, when the plunger rod needs to be extended, the corresponding two-position two-way valve is in a power-off state, and the hydraulic pump 30 injects high-pressure oil into the working chamber of the plunger cylinder based on the unidirectional second oil port and the first oil port, and squeezes the spring while driving the plunger rod to extend; when the plunger rod needs to be retracted, the corresponding two-position two-way valve is in a power-on state, and the hydraulic pump stops supplying oil to it, then the plunger rod retracts under the action of the spring's rebound force, and squeezes the hydraulic oil in the working chamber of the plunger cylinder back to the oil tank through the corresponding valve body, thereby unloading oil and relieving pressure.

[0061] Optionally, combined Figure 2 , Figure 3 As shown, the first clamp 61, the second clamp 62, the third clamp 63, the fourth clamp 64, the fifth clamp 65, the sixth clamp 66, the seventh clamp 67 and the eighth clamp 68 all include a rotatably connected base 91 and a pressure block 92. The base 91 of the first clamp 61, the second clamp 62, the third clamp 63 and the fourth clamp 64 is detachably connected to the movable plate 82. One end of the pressure block 92 is driven by a corresponding hydraulic cylinder to make the pressure block 92 rotate relative to the base 91, thereby reducing the distance between the other end of the pressure block 92 and the base 91 to clamp the movable mold 72, or increasing the distance between the other end of the pressure block 92 and the base 91 to loosen the movable mold 72. Similarly, the base 91 of the fifth clamp 65, the sixth clamp 66, the seventh clamp 67, and the eighth clamp 68 are detachably connected to the fixed plate 81, and one end of the pressing block 92 is driven by the corresponding hydraulic cylinder to make the pressing block 92 rotate relative to the base 91, thereby reducing the distance between the other end of the pressing block 92 and the base 91 to clamp the static mold 71, or increasing the distance between the other end of the pressing block 92 and the base 91 to release the static mold 71.

[0062] Optionally, the seventh control valve 27 comprises a three-position four-way valve.

[0063] In this embodiment, the seventh control valve 27 can adopt a three-position four-way valve as an important component of the hydraulic control system, which is used to realize the distribution and flow switching of hydraulic oil under different working conditions. The three-position four-way valve has three stable positions, including a middle position and two working positions. When the three-position four-way valve is in the middle position, the hydraulic oil circuit is in a closed state or unloaded state. This position can be used to prevent the hydraulic oil from flowing ineffectively when the hydraulic control system is shut down or on standby, reduce energy consumption, and protect the key components in the hydraulic control system to a certain extent; when the three-position four-way valve is switched to the first working position, the high-pressure oil of the hydraulic pump 30 is distributed to a specific oil circuit (such as the first working port or the second working port) through the channel of the valve body, thereby driving the corresponding hydraulic cylinder to complete the corresponding action, such as pushing the corresponding fixture for one of the static mold 71 and the movable mold 72 to clamp or release; when the three-position four-way valve is switched to the second working position, the flow direction of the hydraulic oil is switched, so as to push the corresponding fixture for the other of the static mold 71 and the movable mold 72 to clamp or release. At the same time, the hydraulic oil in the working chamber of each hydraulic cylinder can flow back to the oil tank 40 through the first oil return port of the three-position four-way valve for recycling. For example, the clamping or loosening of the static mold 71 on the fixed plate 81 and the clamping or loosening of the movable mold 72 on the movable plate 82 correspond to the first working position and the second working position of the three-position four-way valve, respectively, so that the clamping or loosening of the static mold 71 on the fixed plate 81 and the clamping or loosening of the movable mold 72 on the movable plate 82 can be performed independently and separately without interfering with each other.

[0064] In this way, by adopting a three-position four-way valve as the seventh control valve 27, the piping design of the hydraulic control system can be simplified, and various functional requirements can be realized by switching the valve position of the three-position four-way valve, thereby improving the operating efficiency of the hydraulic control system.

[0065] Exemplarily, when the movable mold 72 needs to be clamped, the three-position four-way valve is switched to the first working position, and the first control valve 21, the second control valve 22, and the third control valve 23 are all powered off. Then, driven by the hydraulic pump 30, the hydraulic oil is supplied to the first hydraulic cylinder 11 and the third hydraulic cylinder 13 through the first oil inlet, the second working port, the second oil port and the first oil port of the third control valve 23, and the second oil port and the first oil port of the first control valve 21, and is supplied to the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 through the first oil inlet, the second working port, the second oil port and the first oil port of the three-position four-way valve, and the second oil port and the first oil port of the second control valve 22, thereby driving the plunger rods of the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13, and the fourth hydraulic cylinder 14 to extend, thereby driving the corresponding clamps to act accordingly to achieve clamping. When the movable mold 72 needs to be released, the three-position four-way valve is switched to the second working position, the hydraulic pump 30 stops supplying oil, the first control valve 21, the second control valve 22, and the third control valve 23 are all energized, and the plunger rods of the first hydraulic cylinder 11, the second hydraulic cylinder 12, the third hydraulic cylinder 13, and the fourth hydraulic cylinder 14 are retracted under the action of the rebound force of the internal spring, and squeeze the hydraulic oil in the working chamber of the plunger cylinder to flow back to the oil tank through the corresponding valve body, thereby realizing oil unloading and pressure relief. Specifically, the hydraulic oil in the first hydraulic cylinder 11 and the third hydraulic cylinder 13 flows back to the oil tank 40 through the first oil port 21, the first oil port 23, the second oil port 24, the second working port of the three-position four-way valve, and the first oil return port; the hydraulic oil in the second hydraulic cylinder 12 and the fourth hydraulic cylinder 14 flows back to the oil tank 40 through the first oil port 22, the first oil port 23, the second oil port 24, the second working port of the three-position four-way valve, and the first oil return port.

[0066] Correspondingly, when the static mold 71 needs to be clamped, the three-position four-way valve switches to the second working position, and the fourth control valve 24, the fifth control valve 25 and the sixth control valve 26 are all powered off. Then, driven by the hydraulic pump 30, the hydraulic oil is supplied to the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 through the first oil inlet, the first working port, the second oil port and the first oil port of the sixth control valve 26, the second oil port and the first oil port of the fourth control valve 24, and is supplied to the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 through the first oil inlet, the first working port, the second oil port and the first oil port of the three-position four-way valve, the second oil port and the first oil port of the sixth control valve 26, the second oil port and the first oil port of the fifth control valve 25, thereby driving the plunger rods of the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18 to extend, thereby driving the corresponding clamps to act accordingly to achieve clamping. When the movable mold 72 needs to be released, the three-position four-way valve is switched to the first working position, the hydraulic pump 30 stops supplying oil, the fourth control valve 24, the fifth control valve 25 and the sixth control valve 26 are all energized, and the plunger rods of the fifth hydraulic cylinder 15, the sixth hydraulic cylinder 16, the seventh hydraulic cylinder 17 and the eighth hydraulic cylinder 18 are retracted under the action of the rebound force of the internal spring, and squeeze the hydraulic oil in the working chamber of the plunger cylinder to flow back to the oil tank through the corresponding valve body, thereby realizing oil unloading and pressure relief. Specifically, the hydraulic oil in the fifth hydraulic cylinder 15 and the seventh hydraulic cylinder 17 flows back to the oil tank 40 through the first oil port 1 and the second oil port 24 of the fourth control valve 24, the first oil port 1 and the second oil port 26 of the sixth control valve 26, the first working port and the first oil return port of the three-position four-way valve; the hydraulic oil in the sixth hydraulic cylinder 16 and the eighth hydraulic cylinder 18 flows back to the oil tank 40 through the first oil port 1 and the second oil port 25 of the fifth control valve 25, the first oil port 1 and the second oil port 26 of the sixth control valve 26, the first working port and the first oil return port of the three-position four-way valve.

[0067] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A hydraulic control system, characterized in that: The invention comprises a first control valve (21), a second control valve (22), a third control valve (23), a first hydraulic cylinder (11), a second hydraulic cylinder (12), a third hydraulic cylinder (13) and a fourth hydraulic cylinder (14), wherein the first hydraulic cylinder (11), the second hydraulic cylinder (12), the third hydraulic cylinder (13) and the fourth hydraulic cylinder (14) are respectively used to drive a first clamp (61), a second clamp (62), a third clamp (63) and a fourth clamp (64) of the hydraulic clamp which are arranged on a movable plate (82), wherein the first clamp (61) and the second hydraulic cylinder (12) are connected to each other. The third clamp (63) is diagonally arranged on the movable plate (82), and the second clamp (62) and the fourth clamp (64) are diagonally arranged on the movable plate (82); the working chambers of the first hydraulic cylinder (11) and the third hydraulic cylinder (13) are both connected to the first oil port of the third control valve (23) through the first control valve (21) and the corresponding pipeline, and the working chambers of the second hydraulic cylinder (12) and the fourth hydraulic cylinder (14) are both connected to the first oil port of the third control valve (23) through the second control valve (22) and the corresponding pipeline.

2. The hydraulic control system according to claim 1, characterized in that: The hydraulic clamp further comprises a fourth control valve (24), a fifth control valve (25), a sixth control valve (26), a fifth hydraulic cylinder (15), a sixth hydraulic cylinder (16), a seventh hydraulic cylinder (17) and an eighth hydraulic cylinder (18), wherein the fifth hydraulic cylinder (15), the sixth hydraulic cylinder (16), the seventh hydraulic cylinder (17) and the eighth hydraulic cylinder (18) are respectively used to drive a fifth clamp (65), a sixth clamp (66), a seventh clamp (67) and an eighth clamp (68) of the hydraulic clamp which are arranged on the fixed plate (81), wherein the fifth clamp (65) and the eighth hydraulic cylinder (18) are respectively used to drive a fifth clamp (65), a sixth clamp (66), a seventh clamp (67) and an eighth clamp (68) of the hydraulic clamp. The seventh clamp (67) is diagonally arranged on the fixed plate (81), and the sixth clamp (66) and the eighth clamp (68) are diagonally arranged on the fixed plate (81); the working chambers of the fifth hydraulic cylinder (15) and the seventh hydraulic cylinder (17) are both connected to the first oil port of the sixth control valve (26) through the fourth control valve (24) and the corresponding pipeline, and the working chambers of the sixth hydraulic cylinder (16) and the eighth hydraulic cylinder (18) are both connected to the first oil port of the sixth control valve (26) through the fifth control valve (25) and the corresponding pipeline.

3. The hydraulic control system according to claim 2, characterized in that: The invention also comprises a hydraulic pump (30), an oil tank (40) and a seventh control valve (27); the second oil port of the third control valve (23) is connected to the first working port of the seventh control valve (27) through a corresponding pipeline; the second oil port of the sixth control valve (26) is connected to the second working port of the seventh control valve (27) through a corresponding pipeline; the first oil inlet of the seventh control valve (27) is connected to the interior of the oil tank (40) through the hydraulic pump (30) and the first pipeline (51); and the first oil return port of the seventh control valve (27) is connected to the interior of the oil tank (40) through a second pipeline (52).

4. The hydraulic control system according to claim 3, characterized in that: It also includes a one-way valve (28), which is arranged on the first pipeline (51) and located between the first oil inlet and the hydraulic pump (30).

5. The hydraulic control system according to claim 4, characterized in that: It also includes a relief valve (29), wherein a second oil inlet of the relief valve (29) is connected between the one-way valve (28) and the hydraulic pump (30), and is in communication with the first pipeline (51); and a second oil return port of the relief valve (29) is connected to and in communication with the second pipeline (52).

6. The hydraulic control system according to any one of claims 3 to 5, characterized in that: It also includes a pressure measuring mechanism, which is used to be arranged at at least one of the first working port, the second working port, the working port and the first oil return port of the seventh control valve (27).

7. The hydraulic control system according to claim 6, characterized in that: Also included is an alarm mechanism that is communicatively connected to the pressure measuring mechanism.

8. The hydraulic control system according to any one of claims 1 to 5, characterized in that: The first control valve (21), the second control valve (22) and the third control valve (23) are all two-position two-way valves, each of which is provided with the first oil port and the second oil port. The two-position two-way valve is used for unidirectional conduction from the second oil port to the first oil port when power is off, or for bidirectional conduction from the second oil port to the first oil port when power is on.

9. The hydraulic control system according to any one of claims 2 to 5, characterized in that: The fourth control valve (24), the fifth control valve (25) and the sixth control valve (26) are all two-position two-way valves, each of which is provided with the first oil port and the second oil port. The two-position two-way valve is used for unidirectional conduction from the second oil port to the first oil port when power is off, or for bidirectional conduction from the second oil port to the first oil port when power is on.

10. The hydraulic control system according to any one of claims 3 to 5, characterized in that: The seventh control valve (27) comprises a three-position four-way valve.

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