A pressure machine slide connector unloading device

Abstract

The application provides a pressure machine slider connector unloading device, and belongs to the technical field of pressure machine protection equipment, and the technical scheme is that a one-way valve is arranged on an oil inlet pipeline, an oil return pipeline is in communication with a T port, a main oil cavity is in communication with a D port and the T port, a main valve assembly is arranged in the main oil cavity, and the main valve assembly can switch the connection and disconnection of the main oil cavity and the T port; a pilot valve and a control valve are arranged on a main valve body, a pilot oil inlet of the pilot valve is in communication with the P port and the main valve assembly, the pilot valve can drive the main valve assembly to isolate the main oil cavity and the T port through the hydraulic oil input from the P port, a pilot oil return port of the pilot valve is in communication with the oil return pipeline, a control oil inlet of the control valve is in communication with the D port, a control oil return port of the control valve is in communication with the oil return pipeline, a linkage assembly is arranged in the control valve, and the linkage assembly can connect the pilot oil inlet and the pilot oil return port of the pilot valve. The application has the beneficial effect that a large amount of overpressure oil can be quickly discharged when instant large-scale overpressure is encountered.

Description

Technical Field

[0001] This application belongs to the technical field of press protection equipment, specifically relating to an unloading device for a press slide connector. Background Technology

[0002] The slide connector of a press is a core component that transmits stamping power and buffers impact loads. The pressure stability of its internal high-pressure oil chamber directly determines the working safety and process reliability of the press. The unloading device, as a critical protective component of the slide connector, has the core function of real-time monitoring of the high-pressure oil chamber pressure. When the pressure exceeds the limit, it promptly drains oil and relieves pressure, preventing connector deformation, seal failure, or damage to the press's main structure due to overpressure. Simultaneously, it ensures pressure stability during the stamping process, making it an indispensable safety guarantee for the press under high-frequency operating conditions.

[0003] Existing overload protection unloading devices for presses mostly adopt a single oil circuit combined with valve core opening adjustment structure design. They mainly include the machine body, high-pressure oil inlet, return oil pipe inlet, and overload protection device. The core of the overload protection device consists of an oil signal device, a return oil drain pipe, a slide valve, a spring, and a solenoid valve. Its working logic is as follows: the oil signal device detects the pressure; when overpressure occurs, it sends a signal to trigger the solenoid valve, causing the slide valve to overcome the spring force and open the return oil drain pipe, thus achieving unloading; after unloading, the spring force causes the slide valve to reset and close the oil circuit.

[0004] However, when faced with a sudden and large-scale overpressure, the process of oil signal detection, solenoid valve triggering, and full opening of the spool valve exhibits a response delay. Furthermore, the single-path oil drainage capacity is limited, failing to quickly discharge large amounts of overpressured oil. This results in the pressure in the high-pressure oil chamber failing to drop to a safe range within a short time. This delay and insufficient drainage capacity can easily cause the slider connector to withstand instantaneous high pressure, leading to seal rupture, connection structure breakage, and other malfunctions. This not only affects the normal operation of the press but also poses serious equipment damage and safety hazards. Summary of the Invention

[0005] This application addresses the problem that existing structures cannot quickly discharge large amounts of overpressured oil when subjected to instantaneous large-scale overpressure, by providing a pressure machine slide connector unloading device that can quickly discharge large amounts of overpressured oil when encountering instantaneous large-scale overpressure.

[0006] To solve the above problems, the technical solution adopted in this application is a unloading device for a press slide connector, comprising a main valve body with a P port, a D port, and a T port. The P port can be connected to a hydraulic pump, the D port can be connected to a slide connector, and the T port can be connected to an oil tank. The main valve body is provided with an oil inlet pipe, an oil return pipe, and a main oil chamber. One end of the oil inlet pipe is connected to the P port, and the other end is connected to the D port. A check valve is provided on the oil inlet pipe. The oil return pipe is connected to the T port. The main oil chamber is connected to both the D port and the T port, and a main valve is provided in the main oil chamber. The main valve assembly can switch the connection between the main oil chamber and the T port. The main valve body is equipped with a pilot valve and a control valve. The pilot inlet of the pilot valve is connected to the P port and the main valve assembly respectively. The pilot valve can drive the main valve assembly to isolate the main oil chamber from the T port through the hydraulic oil input at the P port. The pilot return port of the pilot valve is connected to the return oil pipeline. The control inlet of the control valve is connected to the D port. The control return port of the control valve is connected to the return oil pipeline. The control valve is equipped with a linkage assembly, which can connect the pilot inlet of the pilot valve to the pilot return port.

[0007] In this technical solution, the main valve body has a P port, a D port, and a T port. The P port can be connected to a hydraulic pump, the D port can be connected to a slider connector, and the T port can be connected to an oil tank. The main valve body has an inlet oil line, a return oil line, and a main oil chamber. One end of the inlet oil line is connected to the P port, and the other end is connected to the D port. A check valve is installed on the inlet oil line. The return oil line is connected to the T port. The main oil chamber is connected to both the D port and the T port. The main oil chamber contains a main valve assembly, which can switch the main oil chamber to the T port. The main valve body is equipped with a pilot valve and a control valve. The pilot inlet of the pilot valve is connected to the P port and the main valve assembly respectively. The pilot valve can drive the main valve assembly to isolate the main oil chamber from the T port through the hydraulic oil input through the P port. The pilot return port of the pilot valve is connected to the return oil pipeline. The control inlet of the control valve is connected to the D port. The control return port of the control valve is connected to the return oil pipeline. The control valve is equipped with a linkage component, which can connect the pilot inlet of the pilot valve to the pilot return port. Compared to existing technologies, this solution can rapidly discharge a large amount of overpressured oil when encountering instantaneous and widespread overpressure. The core of this solution lies in its integrated oil circuit layout and valve linkage design, which constructs an efficient unloading path: Firstly, the main oil chamber directly connects to ports D and T to form a continuous oil discharge channel, providing a large-diameter structural foundation for the rapid flow of the main oil and avoiding the oil discharge obstruction caused by oil circuit bends or channel limitations in conventional solutions; secondly, the control valve is directly connected to port D, allowing the overpressure signal to directly trigger the control valve's action without additional transmission links, and cooperating with the linkage components to immediately control the pilot valve. The time-driven mechanism can quickly connect the pilot inlet and return ports of the pilot valve, thereby instantly relieving the hydraulic pressure on the main valve assembly. This allows the main valve assembly to switch seamlessly to a state where the main oil chamber and the T-port are fully connected. Simultaneously, the coordinated control logic formed by the pilot valve, control valve, and main valve assembly ensures reliable sealing under normal conditions through hydraulic drive and achieves rapid response under overpressure through mechanical linkage. This avoids the response delay or insufficient oil discharge that may occur with single valve control, ultimately enabling the rapid discharge of a large amount of overpressure oil in instantaneous, large-scale overpressure scenarios.

[0008] Furthermore, two check valves are provided, each with a flow direction from port P to port D. This dual check valve configuration creates a redundant protection structure, effectively improving the reliability of the oil inlet circuit compared to a single check valve. It avoids backflow problems caused by a single check valve failure, ensuring a stable supply of hydraulic oil from the hydraulic pump to port D, providing a continuous and reliable power supply to the slide connector. Simultaneously, the unified flow direction strictly limits the oil flow direction, preventing oil from the port D side from back-impacting the hydraulic pump and avoiding damage to the pump due to reverse pressure. This extends the service life of core components of the hydraulic system, and the parallel dual-valve design does not increase oil circuit resistance, ensuring oil inlet efficiency and meeting the power requirements of the press slide connector.

[0009] Furthermore, the main oil chamber is a cylindrical cavity, with an open end facing the pilot valve. The cylindrical cavity structure features simple manufacturing processes and a smooth inner wall, providing uniform assembly space and smooth sliding guidance for the main valve assembly. This reduces frictional resistance during axial movement of the main valve assembly, avoids jamming caused by irregularities in the cavity's inner wall, and improves the response speed of the main oil chamber's on / off switching with the T-port. The open design facing the pilot valve facilitates the assembly and cooperation between the main valve assembly and the pilot valve, ensuring a precise mechanical transmission relationship between them. This avoids interference caused by limited assembly space, while the open structure facilitates the flow and discharge of oil within the cavity, reducing pressure fluctuations caused by residual oil and ensuring stability during the unloading process.

[0010] Furthermore, the main valve assembly includes a main valve sleeve, which is fixed to the inner wall of the main oil chamber. A connecting hole is provided on the side wall of the main valve sleeve. One end of the main valve sleeve corresponds to the T-port, and the other end corresponds to the pilot valve. A main valve core is slidably mounted inside the main valve sleeve. A fixing groove is provided on the end face of the main valve core facing the pilot valve. A main spring is mounted in the fixing groove, with one end fixedly connected to the bottom of the groove and the other end fixedly connected to the pilot valve. The main valve sleeve, fixed to the inner wall of the main oil chamber, provides a stable installation reference for the entire main valve assembly. The connecting hole on its side wall ensures smooth communication between the main oil chamber and the internal oil passage of the main valve sleeve, ensuring unobstructed flow of oil between the main oil chamber and the main valve sleeve. The two ends of the main valve sleeve, corresponding to the T-port and the pilot valve respectively, precisely define the stroke and direction of the main valve core, enabling the main valve core to accurately connect with the on / off control of the T-port and the drive signal of the pilot valve. The sliding assembly of the main valve core and the main valve sleeve enables flexible switching between the on / off states of the main oil chamber and the T-port. The main spring in the fixed groove provides a reliable reset force for the main valve core, ensuring that the main valve core can quickly reset when there is no hydraulic drive, thus ensuring the sealing and isolation effect between the main oil chamber and the T-port under normal conditions. At the same time, the elastic support of the main spring can buffer the impact force when the main valve core moves, reduce component wear, and improve the operational stability and service life of the main valve assembly.

[0011] Furthermore, the pilot valve includes a pilot valve body, which is fixed to the side of the main valve body opposite to the T-port. A pilot valve sleeve is fitted inside the pilot valve body, with one end of the pilot valve sleeve abutting against the end face of a baffle plate. A pilot plug is provided on the side of the baffle plate opposite to the pilot valve sleeve. A pilot valve core is slidably fitted inside the pilot valve sleeve, and a second fixing groove is formed on the end face of the pilot valve core facing the baffle plate. A pilot spring is fitted inside the second fixing groove, with one end of the pilot spring abutting against the bottom of the second fixing groove and the other end abutting against the baffle plate. The pilot valve body is fixed to the side of the main valve body opposite to the T-port, making reasonable use of the installation space of the main valve body, avoiding interference with core structures such as the main oil chamber and the T-port, while ensuring that the pilot valve can form a precise positional correspondence with the main valve assembly, guaranteeing the effective transmission of the drive signal. The pilot valve core, slidably assembled within the pilot valve sleeve, is the core actuating component of the pilot valve. Its smooth sliding directly determines the control response speed of the pilot valve. The cooperation between the baffle and the pilot plug provides reliable limiting and sealing for the pilot valve sleeve and pilot spring, preventing oil leakage and ensuring stable internal pressure of the pilot valve. The pilot spring within the fixed groove provides stable elastic support and reset force for the pilot valve core, ensuring it maintains its initial position without external drive, guaranteeing the normal sealing effect of the pilot valve. The abutment mechanism between the pilot spring and the baffle buffers the impact force during pilot valve core movement, preventing component damage caused by rigid collisions and improving the operational reliability of the pilot valve.

[0012] Furthermore, the pilot valve sleeve has a connecting hole one on its side wall, and the pilot valve core has a connecting hole two on its side wall. Connecting hole two corresponds to connecting hole one. A connecting pipe is located inside the pilot valve body, with one end corresponding to connecting hole one and the other end connected to the inner hole of the main valve sleeve. This correspondence between connecting holes one and two ensures precise oil circuit conduction for the pilot valve core at specific positions, preventing oil circuit blockage or leakage due to misalignment. The connecting pipe also establishes a dedicated pressure transmission channel between the pilot valve and the main valve sleeve, allowing the hydraulic control signal output by the pilot valve to be directly and quickly transmitted to the inside of the main valve sleeve, driving the main valve core to move. This precise oil circuit connection design reduces pressure loss and delay during control signal transmission, improves the pilot valve's control sensitivity to the main valve assembly, and ensures that the main valve assembly can respond promptly to the pilot valve's control commands, achieving rapid switching between the main oil chamber and the T-port on / off state, thus guaranteeing the efficient operation of the unloading device.

[0013] Furthermore, a connecting hole three is provided at the bottom of the fixed groove two, which communicates with connecting hole two. A damping sleeve is fixedly installed inside connecting hole three. The pilot inlet is located on the side wall of the pilot valve core, and the pilot return port is located at the end of the pilot valve sleeve away from the pilot spring. The connection between connecting hole three and connecting hole two creates an oil passage inside the pilot valve core, allowing hydraulic oil to flow smoothly through it. The damping sleeve effectively buffers the pressure impact during hydraulic oil flow, stabilizes the oil pressure, and prevents malfunction of the pilot valve core due to pressure fluctuations, thus improving the stability of pilot valve control. The rational layout of the pilot inlet and pilot return port shortens the oil flow path, reduces oil resistance, and ensures that hydraulic oil can quickly enter the pilot valve and be discharged in a timely manner, improving the response speed of the pilot valve. Meanwhile, the design of having the pilot inlet port located on the side wall of the pilot valve core and the pilot return port located at the end of the pilot valve sleeve avoids mutual interference between the inlet and return ports, ensuring the independence and conduction efficiency of the oil circuit, and further improving the control reliability of the pilot valve.

[0014] Furthermore, the control valve includes a control valve body, which is fixed to the outside of the pilot valve body. A control valve core is slidably mounted within the control valve body, and the sliding direction of the control valve core is the same as that of the pilot valve core. A control plug is located at the end of the control valve core facing away from the pilot valve body, and a control spring is located at the end of the control valve core facing the pilot valve body. One end of the control spring abuts against the control valve core, and the other end abuts against the pilot valve body. A control inlet is located between the control valve core and the control plug, and a control return port is located between the control valve core and the pilot valve body. The control valve body being fixed to the outside of the pilot valve body achieves an integrated layout of the control valve and pilot valve, reducing the overall space occupied by the device and facilitating their coordinated operation. The identical sliding direction of the control valve core and the pilot valve core ensures smooth transmission of the linkage components, avoiding force transmission losses or component interference caused by inconsistent action directions, and improving the coordinated control efficiency of the control valve and the pilot valve. The control plug provides reliable limiting and sealing for the control valve core, preventing oil leakage from the control valve end. The control spring provides stable reset force for the control valve core, ensuring it maintains its initial position in the absence of an overpressure signal, guaranteeing the normal sealing effect of the control valve. The layout of the control inlet and return ports allows oil from port D to directly act on the control valve core, quickly triggering the control valve's action. Simultaneously, the smooth return path avoids pressure buildup caused by oil stagnation, ensuring the control valve can respond promptly to overpressure signals and providing reliable support for the linkage components to drive the pilot valve.

[0015] Furthermore, the pilot valve body is provided with a guide hole, the axis of which is the same as the sliding direction of the control valve core. The linkage assembly includes a push rod, which is slidably assembled in the guide hole. One end of the push rod passes through the control spring and is fixedly connected to the control valve core, while the other end is correspondingly set with the pilot valve core, and a gap is provided between the push rod and the pilot valve core. The guide hole provides precise sliding guidance for the push rod, ensuring that the push rod can move stably in a fixed direction and avoiding linkage failure due to misalignment. The consistency between the axis of the guide hole and the sliding direction of the control valve core further ensures the accuracy of the linkage assembly's action transmission. The fixed connection between the push rod and the control valve core allows the action of the control valve core to be directly and losslessly transmitted to the push rod. The gap between the push rod and the pilot valve core effectively avoids interference between the two under normal conditions, preventing malfunction of the pilot valve due to accidental contact and ensuring the stability of the unloading device's normal operation. When port D is overpressurized, the control valve core drives the push rod to move. The gap allows the push rod to quickly contact and push the pilot valve core to move, ensuring timely linkage response and achieving efficient coordination between the control valve and the pilot valve. This provides a reliable mechanical linkage guarantee for the rapid unloading of overpressurized oil.

[0016] Furthermore, a pressure gauge is mounted on the pilot valve body, with its detection end connected to port D. This pressure gauge allows for real-time monitoring of pressure changes at port D, providing operators with intuitive pressure data for timely understanding of the sliding connector's operating pressure status. When abnormal pressure fluctuations occur at port D, operators can quickly identify the problem and take appropriate measures, preventing equipment damage or malfunction of the unloading device due to untimely handling of excessive pressure, thus improving equipment safety. Simultaneously, the pressure gauge data provides crucial information for the commissioning and maintenance of the unloading device, enabling operators to optimize device parameters based on actual pressure conditions, ensuring the unloading device is always in optimal working condition, and further enhancing the operational stability and reliability of the press sliding connector.

[0017] As can be seen from the above technical solutions, the beneficial effects of this application are as follows:

[0018] 1. Fast overpressure response and high unloading efficiency: Through the integrated oil circuit and valve linkage design, the overpressure signal can be directly triggered and the oil discharge channel can be quickly opened, avoiding oil discharge blockage and response delay.

[0019] 2. Reliable and stable operation, with redundant protection from dual check valves and spring reset structure to ensure normal sealing and component lifespan, reducing the risk of failure;

[0020] 3. High degree of integration and precise control; the integrated valve layout saves space; and the precise oil circuit and linkage design improves the efficiency of coordinated control.

[0021] 4. Excellent safety and maintainability; the pressure gauge monitors pressure in real time, facilitating timely troubleshooting and parameter optimization. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a front view schematic diagram of a specific embodiment of this application;

[0024] Figure 2 This is a left-side view of a specific embodiment of this application;

[0025] Figure 3 for Figure 1 Schematic diagram of the cross section of AA;

[0026] Figure 4 for Figure 1 Cross-sectional view of BB;

[0027] Figure 5 for Figure 4 Enlarged view of a section at point M;

[0028] Figure 6 for Figure 4 Enlarged view of a section at point N in the middle;

[0029] Figure 7 for Figure 4 Cross-sectional view of CC;

[0030] Figure 8 This is a schematic diagram illustrating the working principle of a specific implementation method of this application;

[0031] Figure 9 This is a schematic diagram illustrating the principle of unloading during the specific implementation of this application;

[0032] Figure 10 This is an installation diagram illustrating a specific embodiment of this application.

[0033] In the diagram: 1. Main valve body; 11. Inlet oil line; 111. Check valve; 12. Return oil line; 13. Main oil chamber; 2. Slider connector; 3. Oil tank; 4. Main valve assembly; 41. Main valve sleeve; 411. Connecting hole; 42. Main valve core; 421. Fixing groove one; 43. Main spring; 5. Pilot valve; 51. Pilot valve body; 52. Pilot valve sleeve; 521. Connecting hole one; 53. Baffle; 531. Pilot spring; 54. Pilot plug 55. Pilot valve core; 551. Fixing groove two; 552. Connecting hole two; 553. Connecting hole three; 554. Damping sleeve; 56. Connecting pipeline; 57. Guide hole; 58. Pilot oil inlet; 59. Pilot oil return port; 6. Control valve; 61. Control valve body; 62. Control valve core; 63. Control plug; 64. Control spring; 65. Control oil inlet; 66. Control oil return port; 7. Linkage assembly; 71. Push rod; 8. Pressure gauge. Detailed Implementation

[0034] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0035] An unloading device for a press slide connector, such as Figure 1-7 As shown, the device includes a main valve body 1, which serves as the mounting reference for the entire unloading device. The main valve body 1 has three functional ports: P port, D port, and T port. The P port connects to a hydraulic pump, providing hydraulic power to the entire device; the D port connects to a slider connector 2, enabling the delivery and pressure transmission of hydraulic oil to the slider connector 2; and the T port connects to an oil tank 3, serving as a return channel for the unloading oil.

[0036] The main valve body 1 is equipped with an oil inlet pipe 11, an oil return pipe 12, and a main oil chamber 13. One end of the oil inlet pipe 11 is connected to port P on the main valve body 1, and the other end is connected to port D, forming a main oil inlet channel from port P to port D. Two check valves 111 are installed on the oil inlet pipe 11, and the two check valves 111 are connected in parallel on the oil inlet pipe 11. The conduction direction of each check valve 111 is from port P to port D, which can effectively prevent oil backflow caused by the failure of a single check valve 111, and does not increase the oil inlet resistance. One end of the oil return pipe 12 is connected to port T on the main valve body 1, and the other end extends to the corresponding area inside the main valve body 1, providing a centralized return channel for the return oil of each valve component. The main oil chamber 13 is a cylindrical cavity structure, and the end of the main oil chamber 13 facing the pilot valve 5 to be assembled later is open, so as to reserve assembly space for the subsequent assembly and cooperation of the main valve assembly 4 and the pilot valve 5. One end of the main oil chamber 13 is connected to the T port on the main valve body 1, and the other end is set to extend out of the main valve body 1. The side wall of the main oil chamber 13 is connected to the corresponding position inside the main valve body 1, so as to realize the connection between the main oil chamber 13 and the D port.

[0037] The main oil chamber 13 is equipped with a main valve assembly 4. The core mounting reference of the main valve assembly 4 is the main valve sleeve 41, which is fixedly mounted on the inner wall of the main oil chamber 13, forming a sealed and fixed relationship with the inner wall of the main oil chamber 13. A connecting hole 411 is opened on the side wall of the main valve sleeve 41, which penetrates the side wall of the main valve sleeve 41, so that the internal cavity of the main valve sleeve 41 is connected to the main oil chamber 13, ensuring smooth flow of oil between the main oil chamber 13 and the main valve sleeve 41. One end of the main valve sleeve 41 is set to correspond to the inner connecting port of the T-port on the main valve body 1, ensuring that the inside of the main valve sleeve 41 is precisely connected to the T-port; the other end is set to face the opening end of the main oil chamber 13, corresponding to the pilot valve 5 to be assembled later, reserving alignment space for power transmission. The main valve core 42 is installed inside the internal cavity of the main valve sleeve 41. A sealing ring is installed on the outside of the main valve core 42, which can slide smoothly along the main valve sleeve 41 and form a reliable seal, effectively preventing oil leakage and ensuring that the oil pressure on both sides of the main valve core 42 is stable and does not cross pressure. The end face of the main valve core 42 facing the pilot valve 5 has a fixing groove 421. A main spring 43 is installed in the fixing groove 421. One end of the main spring 43 is fixedly connected to the bottom of the fixing groove 421, and the other end extends out of the fixing groove 421 and is fixedly connected to the pilot valve 5 that is installed later. The elastic force of the main spring 43 provides a stable reset force for the main valve core 42.

[0038] On the side of the main valve body 1 away from the T-port, corresponding to the outer side of the opening end of the main oil chamber 13, a pilot valve 5 is fixedly installed. The installation reference of the pilot valve 5 is the pilot valve body 51, which is fixed to the side of the main valve body 1 away from the T-port. After assembly, it completely covers the opening of the main oil chamber 13, and a sealing ring is installed at the contact surface between the pilot valve body 51 and the main valve body 1 to form a reliable seal and prevent oil leakage. Its assembly position is precisely aligned with the opening end of the main oil chamber 13 to ensure a precise power transmission relationship with the main valve core 42 of the main valve assembly 4. A pilot valve sleeve 52 is installed inside the pilot valve body 51. One end of the pilot valve sleeve 52 is positioned against the end face of the baffle 53. A pilot plug 54 is provided on the side of the baffle 53 opposite to the pilot valve sleeve 52. The pilot plug 54 is installed at the corresponding port of the pilot valve body 51 and is fixed by the pilot plug 54, pressing the baffle 53 against the end face of the pilot valve sleeve 52 to achieve the limiting and fixing of the pilot valve sleeve 52. A pilot valve core 55 is installed inside the pilot valve sleeve 52. A sealing ring is installed on the outside of the pilot valve core 55, which can slide smoothly along the pilot valve sleeve 52 and form a reliable seal to prevent oil leakage and ensure pressure stability. The pilot valve core 55 has a fixing groove 2 551 on its end face facing the baffle 53. A pilot spring 531 is installed in the fixing groove 2 551. One end of the pilot spring 531 abuts against the bottom of the fixing groove 2 551, and the other end abuts against the baffle 53. Under normal conditions, the elastic force of the pilot spring 531 pushes the pilot valve core 55 to move, so that the pilot valve core 55 presses against the pilot return port 59, blocking the oil inside the pilot valve sleeve 52 from flowing back from the pilot return port 59 to the oil tank 3. The elastic force of the pilot spring 531 provides stable reset and support force for the pilot valve core 55.

[0039] A connecting hole 521 is provided on the side wall of the pilot valve sleeve 52, and a corresponding connecting hole 552 is provided on the side wall of the pilot valve core 55. The connecting hole 552 corresponds to the connecting hole 521. When the pilot valve core 55 slides to a specific position, the connecting hole 521 and the connecting hole 552 can be precisely connected. A connecting pipe 56 is provided inside the pilot valve body 51. One end of the connecting pipe 56 is connected to the connecting hole 521, and the other end extends to the connection surface between the pilot valve body 51 and the main valve body 1, and communicates with the inner hole of the main valve sleeve 41, forming a control oil passage from the pilot valve 5 to the inside of the main valve sleeve 41. A connecting hole 553 is provided at the bottom of the fixed groove 2 551 on the pilot valve core 55. One end of the connecting hole 3 553 is connected to the inside of the fixed groove 2 551, and the other end is connected to the connecting hole 2 552, forming an oil passage inside the pilot valve core 55. A damping sleeve 554 is fixedly installed inside the connecting hole 3 553, and the oil circuit pressure is stabilized by the throttling effect of the damping sleeve 554. The pilot inlet 58 is located on the side wall of the pilot valve core 55. One end of the pilot inlet 58 is connected to the internal oil passage of the pilot valve core 55, and the other end is connected to the P port on the main valve body 1 and the inner hole of the main valve sleeve 41 in the main valve assembly 4, so as to realize the synchronous oil supply from the P port to the pilot valve 5 and the main valve assembly 4. The pilot return port 59 is located at the end of the pilot valve sleeve 52 away from the pilot spring 531. One end of the pilot return port 59 is connected to the internal cavity of the pilot valve sleeve 52, and the other end is connected to the return oil pipeline 12 in the main valve body 1, forming the return oil channel of the pilot valve 5.

[0040] A control valve 6 is fixedly mounted on the outer side of the pilot valve body 51. The installation reference of the control valve 6 is the control valve body 61, which is fixed to the outer side of the pilot valve body 51, forming an integrated assembly structure. A control valve core 62 is mounted inside the control valve body 61. A combined sealing ring is mounted on the outer side of the control valve core 62, allowing it to slide smoothly along the control valve body 61 and form a reliable seal to prevent oil leakage. The sliding direction of the control valve core 62 is the same as that of the pilot valve core 55, ensuring subsequent linkage. A control plug 63 is provided at the end of the control valve core 62 facing away from the pilot valve body 51. The control plug 63 is fixed to the corresponding port of the control valve body 61, limiting the movement of the control valve core 62. A control spring 64 is provided at the end of the control valve core 62 facing the pilot valve body 51. One end of the control spring 64 abuts against the control valve core 62, and the other end abuts against the pilot valve body 51. The elastic force of the control spring 64 provides a stable reset force for the control valve core 62. The control inlet 65 is located between the control valve core 62 and the control plug 63. One end of the control inlet 65 is connected to the inside of the control valve body 61, and the other end is connected to port D on the main valve body 1, so as to supply oil to the control valve 6 through port D. The control return port 66 is located between the control valve core 62 and the pilot valve body 51. One end of the control return port 66 is connected to the inside of the control valve body 61, and the other end is connected to the return oil pipeline 12 in the main valve body 1, forming the return oil channel of the control valve 6.

[0041] A linkage assembly 7 is assembled between the control valve body 61 and the pilot valve body 51. The pilot valve body 51 has a guide hole 57, the direction of which is the same as the sliding direction of the control valve core 62, providing a guiding reference for the sliding of the linkage assembly 7. The linkage assembly 7 includes a push rod 71, which is slidably assembled in the guide hole 57, with a clearance fit with the inner wall of the guide hole 57, and can slide freely along the guide hole 57. All other sliding parts are equipped with sealing rings to ensure sealing and prevent leakage. One end of the push rod 71 passes through the control spring 64 and is fixedly connected to the control valve core 62, moving synchronously with the sliding of the control valve core 62; the other end extends to the position in the pilot valve body 51 corresponding to the pilot valve core 55, and is set corresponding to the pilot valve core 55. There is a gap between the push rod 71 and the pilot valve core 55 to avoid mutual interference under normal conditions. The linkage assembly 7 can drive the pilot oil inlet 58 and pilot oil return 59 of the pilot valve 5 to connect.

[0042] A pressure gauge 8 is mounted on the pilot valve body 51. The detection end of the pressure gauge 8 is connected to port D on the main valve body 1, which can detect the oil pressure at port D in real time, so as to accurately control the working pressure status of the slider connector 2.

[0043] Work process: such as Figure 8-10 As shown,

[0044] I. Normal working status

[0045] Under normal conditions, the hydraulic pump continuously supplies oil to port P. The oil flows through the inlet pipe 11 and two parallel check valves 111 to be stably delivered to port D, providing continuous and reliable hydraulic power to the slider connector 2. The check valves 111 maintain a one-way flow from port P to port D, effectively blocking the backflow of oil from port D to port P, and preventing the hydraulic pump from being impacted by reverse pressure. Meanwhile, part of the oil output from port P is fed into the pilot inlet 58 of the pilot valve 5. The oil first enters the pilot valve core 55 and then flows through the connecting hole 3 553 at the bottom of the fixed groove 2 551. A damping sleeve 554 is fixedly installed in the connecting hole 3 553. After the oil is throttled and stabilized by the damping sleeve 554, it flows into the connecting hole 2 552. Under normal conditions, the pilot valve core 55 is in the correct position, and the connecting hole 2 552 is precisely connected to the connecting hole 1 521 on the side wall of the pilot valve sleeve 52. The oil then enters the connecting pipe 56 in the pilot valve body 51 through the connecting hole 1 521 and is finally delivered to the inner hole of the main valve sleeve 41. The hydraulic pressure generated by this part of the oil directly acts on the main valve core 42. Under normal conditions, the main spring 43 is in a stretched state, and the pulling force is the force that pulls the main valve core 42 back. Moreover, the thrust of the oil at port P on the main valve core 42 is greater than the pulling force of the main spring 43, which pushes the main valve core 42 to completely block the communication channel between the main oil chamber 13 and port T, thereby disconnecting and isolating the main oil chamber 13 from port T. The pressure at port D is maintained within the normal working range, and the slider connector 2 operates stably. In this state, the pilot spring 531 elastically supports and pushes the pilot valve core 55 to tightly press against the pilot return port 59, preventing the oil inside the pilot valve sleeve 52 from flowing out. The internal oil circuit pressure is stable, and the main valve sleeve 41 is continuously supplied with control oil. At the control valve 6, the control spring 64 pushes the control valve core 62 to the initial limit position. The control valve core 62 completely blocks the connection path between the control inlet port 65 and the control return port 66. The push rod 71 of the linkage component 7 maintains a preset gap with the pilot valve core 55, with no contact and no linkage. The pressure gauge 8 monitors the normal pressure at port D in real time, and the entire device operates stably.

[0046] II. Slight overpressure state

[0047] When a slight overpressure occurs at port D due to minor oil leakage in the pipeline or slight load fluctuation, the overpressured oil at port D simultaneously enters the control inlet 65 because the control inlet 65 is directly connected to port D. The oil pressure directly acts on the side of the control valve core 62 facing the control plug 63. This overpressure is greater than the initial support force of the control spring 64, pushing the control valve core 62 to move along the control valve body 61 towards the pilot valve body 51, while simultaneously compressing the control spring 64. As the control valve core 62 gradually moves, when the valve core displacement exceeds the position of the control return port 66, the control inlet 65 and the control return port 66 achieve precise connection. The slightly overpressured oil at port D flows in through the control inlet 65, then directly enters the return pipeline 12 in the main valve body 1 through the control return port 66, and finally flows back to the oil tank 3, achieving rapid and slight pressure relief. Once the pressure at port D drops to its normal value as pressure is released, the pressure at the control inlet 65 decreases, the compressed control spring 64 releases its reset force, and pushes the control valve core 62 to reset in the reverse direction until the valve core re-blocks the connection path between the control inlet 65 and the control return port 66, at which point pressure release stops. If a slight overpressure occurs at port D again, the above actions are repeated, and the control valve core 62 moves back and forth to achieve intermittent slight pressure release, always keeping the pressure at port D within a safe range. Throughout the process, the movement distance of the control valve core 62 is limited, causing the push rod 71 to move slightly in sync. The push rod 71 never contacts the pilot valve core 55, and the pilot valve 5 and the main valve assembly 4 remain in normal working condition. The main oil chamber 13 remains disconnected from port T and does not participate in the slight pressure release action.

[0048] III. Instantaneous rapid overpressure state

[0049] When port D experiences a sudden, large-scale, rapid overpressure, the overpressured oil at port D quickly rushes into the control inlet port 65. The instantaneous high-pressure force is far greater than the restoring force of the control spring 64, pushing the control valve core 62 to move rapidly along the control valve body 61 towards the pilot valve body 51. The control spring 64 is compressed sharply, simultaneously driving the push rod 71 to slide rapidly along the guide hole 57. As the control valve core 62 moves rapidly, the push rod 71 instantly eliminates the preset gap with the pilot valve core 55, directly pushing the pilot valve core 55 to slide towards the baffle 53. The pilot valve core 55 overcomes the elastic force of the pilot spring 531 and moves until it is completely separated from the pilot return port 59. The pilot return port 59 is fully opened, and at this time, the linkage component 7 connects the pilot inlet port 58 and the pilot return port 59. The control oil input from the pilot inlet port 58 no longer flows to the main valve sleeve 41, but quickly flows back to the return oil line 12 through the pilot return port 59, and finally flows back to the oil tank 3. The oil supply passage from the pilot inlet 58 to the main valve sleeve 41 is completely disconnected, the control oil in the main valve sleeve 41 is rapidly depressurized, and the hydraulic thrust on the main valve core 42 disappears instantly; the main spring 43, which is in a stretched state, loses its thrust constraint and quickly releases its reset force, pulling the main valve core 42 back to reset quickly. After the main valve core 42 resets, the connection channel between the main oil chamber 13 and the T port is completely opened without any blockage. A large amount of overpressured oil at the D port rapidly flows into the main oil chamber 13 through the connection point on the side wall of the main oil chamber 13, and then flows into the return oil pipeline 12 through the unobstructed channel between the main oil chamber 13 and the T port, and finally flows back to the oil tank 3, achieving instantaneous large-flow unloading and effectively preventing overpressure damage to the slider connector 2, hydraulic pump, and other core components of the device.

[0050] As can be seen from the above embodiments, the beneficial effects of this application are as follows:

[0051] 1. Fast overpressure response and high unloading efficiency: Through the integrated oil circuit and valve linkage design, the overpressure signal can be directly triggered and the oil discharge channel can be quickly opened, avoiding oil discharge blockage and response delay.

[0052] 2. Reliable and stable operation, with redundant protection from dual check valves and spring reset structure to ensure normal sealing and component lifespan, reducing the risk of failure;

[0053] 3. High degree of integration and precise control; the integrated valve layout saves space; and the precise oil circuit and linkage design improves the efficiency of coordinated control.

[0054] 4. Excellent safety and maintainability; the pressure gauge monitors pressure in real time, facilitating timely troubleshooting and parameter optimization.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A unloading device for a press slide connector, comprising a main valve body (1), wherein the main valve body (1) is provided with a P port, a D port and a T port, the P port being able to connect to a hydraulic pump, the D port being able to connect to a slide connector (2), and the T port being able to connect to an oil tank (3), characterized in that, The main valve body (1) is provided with an oil inlet pipe (11), an oil return pipe (12), and a main oil chamber (13). One end of the oil inlet pipe (11) is connected to port P, and the other end is connected to port D. A check valve (111) is provided on the oil inlet pipe (11). The oil return pipe (12) is connected to port T. The main oil chamber (13) is connected to ports D and T respectively. A main valve assembly (4) is provided in the main oil chamber (13). The main valve assembly (4) can switch the connection and disconnection between the main oil chamber (13) and port T. A pilot valve (5) and a control valve (6) are provided on the main valve body (1). The pilot inlet (5) of the pilot valve (5) is located at the pilot inlet (5). 8) Connected to port P and main valve assembly (4) respectively. Pilot valve (5) can drive main valve assembly (4) to isolate main oil chamber (13) from T port through hydraulic oil input through port P. Pilot return port (59) of pilot valve (5) is connected to return oil pipeline (12). Control inlet port (65) of control valve (6) is connected to port D. Control return port (66) of control valve (6) is connected to return oil pipeline (12). Control valve (6) is equipped with linkage assembly (7). Linkage assembly (7) can connect pilot inlet port (58) of pilot valve (5) to pilot return port (59).

2. The unloading device for the press slide connector according to claim 1, characterized in that, There are two check valves (111), and the conduction direction of each check valve (111) is from port P to port D.

3. The unloading device for a press slide connector according to claim 1, characterized in that, The main oil chamber (13) is a cylindrical cavity, and the end of the main oil chamber (13) facing the pilot valve (5) is open.

4. The unloading device for a press slide connector according to claim 1, characterized in that, The main valve assembly (4) includes a main valve sleeve (41), which is fixed to the inner wall of the main oil chamber (13). A connecting hole (411) is provided on the side wall of the main valve sleeve (41). One end of the main valve sleeve (41) is set to correspond to the T port, and the other end is set to correspond to the pilot valve (5). A main valve core (42) is slidably assembled in the main valve sleeve (41). A fixing groove (421) is provided on the end face of the main valve core (42) facing the pilot valve (5). A main spring (43) is assembled in the fixing groove (421). One end of the main spring (43) is fixedly connected to the bottom of the fixing groove (421), and the other end is fixedly connected to the pilot valve (5).

5. The unloading device for a press slide connector according to claim 4, characterized in that, The pilot valve (5) includes a pilot valve body (51), which is fixed to the side of the main valve body (1) away from the T port. A pilot valve sleeve (52) is installed inside the pilot valve body (51). One end of the pilot valve sleeve (52) abuts against the end face of the baffle (53). A pilot plug (54) is provided on the side of the baffle (53) away from the pilot valve sleeve (52). A pilot valve core (55) is slidably installed inside the pilot valve sleeve (52). A fixing groove (551) is opened on the end face of the pilot valve core (55) facing the baffle (53). A pilot spring (531) is installed inside the fixing groove (551). One end of the pilot spring (531) abuts against the bottom of the fixing groove (551), and the other end abuts against the baffle (53).

6. The unloading device for a press slide connector according to claim 5, characterized in that, The pilot valve sleeve (52) has a connection hole 1 (521) on its side wall, and the pilot valve core (55) has a connection hole 2 (552) on its side wall. The connection hole 2 (552) is set in correspondence with the connection hole 1 (521). The pilot valve body (51) has a connection pipe (56) inside. One end of the connection pipe (56) is set in correspondence with the connection hole 1 (521), and the other end is connected to the inner hole of the main valve sleeve (41).

7. The unloading device for a press slide connector according to claim 6, characterized in that, The bottom of the fixed groove 2 (551) is provided with a connecting hole 3 (553), which is connected to the connecting hole 2 (552). A damping sleeve (554) is fixedly installed in the connecting hole 3 (553). The pilot oil inlet (58) is opened on the side wall of the pilot valve core (55), and the pilot oil return port (59) is opened at the end of the pilot valve sleeve (52) away from the pilot spring (531).

8. The unloading device for a press slide connector according to claim 7, characterized in that, The control valve (6) includes a control valve body (61), which is fixed to the outside of the pilot valve body (51). A control valve core (62) is slidably mounted inside the control valve body (61). The sliding direction of the control valve core (62) is the same as that of the pilot valve core (55). A control plug (63) is provided at the end of the control valve core (62) away from the pilot valve body (51). A control spring (64) is provided at the end of the control valve core (62) facing the pilot valve body (51). One end of the control spring (64) abuts against the control valve core (62), and the other end abuts against the pilot valve body (51). A control oil inlet (65) is opened between the control valve core (62) and the control plug (63). A control oil return port (66) is opened between the control valve core (62) and the pilot valve body (51).

9. The unloading device for a press slide connector according to claim 8, characterized in that, The pilot valve body (51) is provided with a guide hole (57). The axial direction of the guide hole (57) is the same as the sliding direction of the control valve core (62). The linkage assembly (7) includes a push rod (71). The push rod (71) is slidably assembled in the guide hole (57). One end of the push rod (71) passes through the control spring (64) and is fixedly connected to the control valve core (62). The other end is correspondingly set with the pilot valve core (55). There is a gap between the push rod (71) and the pilot valve core (55).

10. The unloading device for a press slide connector according to claim 5, characterized in that, A pressure gauge (8) is mounted on the pilot valve body (51), and the detection end of the pressure gauge (8) is connected to port D.

Images