A valve core reset device

Abstract

The utility model discloses a kind of selectable valve core reset device, access oil pressure control system and emergency shutdown valve hydraulic control system, and is equipped with three oil paths: the first two access oil tank of oil pressure control system, the third access its oil pressure accumulator, dry road is equipped with electric valve and has multiple branch lines afterwards.Device contains switch control valve, auxiliary booster mechanism, hydraulic feedback mechanism, double filter, digital valve, proportional valve, proportional digital switching valve, auxiliary switching valve, two hydraulic control reversing valves and two travel switches, etc., and is connected into complete control and execution system by pipeline.It can be switched digital valve and proportional valve control mode by proportional digital switching valve, adapt to different working conditions;With hydraulic control reversing valve and travel switch cooperation, realize oil path accurate control and valve core reset monitoring feedback, improve accuracy;It is also equipped with main matching position sensor, manual valve etc., enhance system stability and controllability, can guarantee valve core reset reliable under complex working condition, improve oil pressure pump oil conveying system overall efficiency and reliability.

Description

Technical Field

[0001] This utility model relates to an oil pump delivery system, specifically to a selectable valve core rebalancing device in an oil pump delivery system. Background Technology

[0002] In hydraulic control systems, precise control of the main valve is crucial for ensuring stable system operation. This main valve typically has three operating states: fully enclosed (PTAB closed), cross-connected, and pressure return. Its valve core movement is driven by a guide mechanism, achieving synchronous displacement adjustment through hydraulic feedback. Specifically, the up-and-down movement of the guide mechanism directly drives the valve core to move in the same direction, forming the basis of closed-loop control.

[0003] In the operation of hydraulic pump oil delivery systems, the accuracy and stability of valve spool centering control have a significant impact on the overall system performance. Traditional valve spool centering devices often suffer from problems such as a single control mode and insufficient ability to cope with complex operating conditions. They are unable to quickly and accurately achieve valve spool centering under different operating requirements, affecting system efficiency and reliability. Therefore, there is an urgent need for a valve spool centering device that can flexibly select control modes and adapt to diverse operating conditions. Utility Model Content

[0004] The present invention aims to provide a selectable valve core centering device, which enables switching between multiple control modes, improves the accuracy of valve core centering and the stability of system operation, and adapts to different working conditions.

[0005] To solve the above technical problems, the present invention achieves this through the following solution: The present invention provides a selectable valve core rebalancing device, which is connected to the hydraulic control system and the emergency stop valve hydraulic control system respectively. The rebalancing device is provided with three oil circuits, namely the first oil circuit, the second oil circuit and the third oil circuit. The first oil circuit and the second oil circuit are both connected to the oil tank of the hydraulic control system, and the third oil circuit is connected to the hydraulic accumulator of the hydraulic control system.

[0006] The main line of the third oil circuit is equipped with an electric valve, and multiple branch lines are set in the oil circuit connected after the electric valve.

[0007] The re-centering device includes:

[0008] A power on / off control valve has a constant pressure chamber, a power off chamber, and a power on chamber. The constant pressure chamber is connected to a branch of the third oil circuit via a pipeline. The T-port of the power off chamber is connected to the second oil circuit, and the P-port of the power on chamber is connected to a branch of the third oil circuit.

[0009] An auxiliary relay mechanism has a piston inside its housing. The outer end of the piston extends out of the housing of the auxiliary relay mechanism and connects to one end of the starting chamber. The piston is fitted with a piston guide rod. The housing of the auxiliary relay mechanism is divided into a first chamber and a second chamber by the piston. The first chamber is connected to a first oil circuit through a pipeline.

[0010] The hydraulic feedback mechanism has one end connected to the piston guide rod and the other end fixed.

[0011] The dual filter has its inlet end connected to the oil circuit following the electric valve, and its outlet end connected to the inlet end of the hydraulic feedback mechanism.

[0012] A digital valve, the P port of which is connected to the oil outlet of the dual filter, and its T port is connected to the first oil circuit;

[0013] A proportional valve, the P port of which is connected to the oil outlet of the dual filter, and its T port is connected to the first oil circuit.

[0014] A proportional digital switching valve is used to switch between the digital valve and the proportional valve. Its B port is connected to the A port of the digital valve, and the A port of the proportional digital switching valve is connected to the A port of the proportional valve.

[0015] An auxiliary switching valve has its B port connected to the P port of the proportional digital switching valve, and its A port connected to the oil outlet of the hydraulic feedback mechanism. The B port of the auxiliary switching valve is connected to the P port of the auxiliary switching valve through a pipeline.

[0016] The first hydraulically controlled directional valve has its B port connected to the P port of the auxiliary switching valve, and its A port connected to the first oil circuit.

[0017] The first limit switch has its T interface connected to the first oil circuit, its P interface connected to the oil outlet of the dual filter, its B interface connected to the K end control oil port of the first hydraulic directional valve, and its A interface connected to the L end valve core return spring of the first hydraulic directional valve.

[0018] The second hydraulic directional valve has its B port connected to the P port of the first hydraulic directional valve, its A port connected to the first oil circuit, and its P port connected to the second chamber of the auxiliary relay mechanism.

[0019] The second limit switch has its T interface connected to the first oil circuit, its P interface connected to the P interface of the first limit switch, its B interface connected to the L end valve core return spring of the second hydraulic directional valve, and its A interface connected to the K end control oil port of the second hydraulic directional valve.

[0020] Furthermore, the on / off control valve is connected to a main / secondary position sensor.

[0021] Furthermore, a manual valve is connected between the hydraulic control system and the emergency stop valve hydraulic control system.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: Compared with the prior art, this utility model can flexibly switch between digital valve and proportional valve control modes through a proportional digital switching valve to adapt to different working conditions and requirements for valve core centering accuracy and response speed; with the help of hydraulic directional valve and limit switch, it can achieve precise control of oil circuit and effective monitoring and feedback of valve core centering process, thereby improving valve core centering accuracy; by setting main and auxiliary position sensors, manual valves, etc., it can enhance the stability and controllability of system operation, and ensure reliable valve core centering even under complex working conditions, thereby improving the overall efficiency and reliability of the hydraulic pump oil delivery system. Attached Figure Description

[0023] Figure 1 This is a diagram showing the overall pipeline connection structure of the selectable valve core rebalancing device of this utility model.

[0024] Figure 2 for Figure 1 Enlarged view of the lower area.

[0025] Figure 3 for Figure 1 Enlarged view of the upper area.

[0026] The following are labeled in the attached diagram: First oil circuit 1, Second oil circuit 2, Third oil circuit 3, First hydraulic directional valve 4, First limit switch 5, Second hydraulic directional valve 6, Second limit switch 7, Auxiliary switching valve 8, Proportional-digital switching valve 9, Proportional valve 10, Digital valve 11, Hydraulic feedback mechanism 12, Dual filter 13, On / off control valve 14, Main and auxiliary position sensor 15, Auxiliary relay mechanism 16. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] Example 1: The specific structure of this utility model is as follows:

[0030] Please refer to the appendix. Figure 1-3 This utility model discloses a selectable valve core rebalancing device, which is connected to the hydraulic control system and the emergency stop valve hydraulic control system respectively. The rebalancing device has three oil circuits, namely the first oil circuit 1, the second oil circuit 2 and the third oil circuit 3. The first oil circuit 1 and the second oil circuit 2 are both connected to the oil tank of the hydraulic control system, and the third oil circuit 3 is connected to the hydraulic accumulator of the hydraulic control system.

[0031] The main line of the third oil line 3 is equipped with an electric valve, and multiple branch lines are set in the oil line connected after the electric valve.

[0032] The re-centering device includes:

[0033] The on / off control valve 14 has a constant pressure chamber, a shutdown chamber and an on / off chamber. The constant pressure chamber is connected to a branch of the third oil circuit 3 through a pipeline. The T interface of the shutdown chamber is connected to the second oil circuit 2. The P interface of the on / off chamber is connected to a branch of the third oil circuit 3.

[0034] An auxiliary relay mechanism 16 has a piston inside its housing cavity. The outer end of the piston extends out of the housing cavity of the auxiliary relay mechanism 16 and connects to one end of the start-up chamber. The piston is fitted with a piston guide rod. The housing cavity of the auxiliary relay mechanism 16 is divided into a first chamber and a second chamber by the piston. The first chamber is connected to the first oil passage 1 through a pipeline.

[0035] The hydraulic feedback mechanism 12 has one end connected to the piston guide rod and the other end fixed.

[0036] Dual filter 13, the oil inlet of which is connected to the oil circuit after the electric valve, and the oil outlet of which is connected to the oil inlet of the hydraulic feedback mechanism 12.

[0037] Digital valve 11, the P port of which is connected to the oil outlet of the dual filter 13, and its T port is connected to the first oil circuit 1;

[0038] The proportional valve 10 has its P port connected to the oil outlet of the dual filter 13 and its T port connected to the first oil circuit 1.

[0039] A proportional digital switching valve 9 is used to switch between the digital valve 11 and the proportional valve 10. Its B port is connected to the A port of the digital valve 11, and its A port is connected to the A port of the proportional valve 10.

[0040] An auxiliary switching valve 8 is provided, with its B port connected to the P port of the proportional digital switching valve 9 and its A port connected to the oil outlet of the hydraulic feedback mechanism 12. The B port of the auxiliary switching valve 8 is connected to the P port of the auxiliary switching valve 8 via a pipeline.

[0041] The first hydraulically controlled directional valve 4 has its B port connected to the P port of the auxiliary switching valve 8, and its A port connected to the first oil circuit 1.

[0042] The first limit switch 5 has its T interface connected to the first oil circuit 1, its P interface connected to the oil outlet of the dual filter 13, its B interface connected to the K end control oil port of the first hydraulic directional valve 4, and its A interface connected to the L end valve core reset spring of the first hydraulic directional valve 4.

[0043] The second hydraulic directional valve 6 has its B port connected to the P port of the first hydraulic directional valve 4, its A port connected to the first oil circuit 1, and its P port connected to the second chamber of the auxiliary relay mechanism 16.

[0044] The second limit switch 7 has its T interface connected to the first oil circuit 1, its P interface connected to the P interface of the first limit switch 5, its B interface connected to the L end valve core return spring of the second hydraulic directional valve 6, and its A interface connected to the K end control oil port of the second hydraulic directional valve 6.

[0045] The on / off control valve 14 is connected to a main / secondary position sensor 15.

[0046] A manual valve is connected between the hydraulic control system and the emergency stop valve hydraulic control system.

[0047] Example 2:

[0048] This selectable valve core centering device is linked with the hydraulic control system and the emergency stop valve hydraulic control system through multiple oil circuits. Its core function is to achieve valve core centering control (i.e., the valve core returns to the neutral position) through the coordinated action of hydraulic components. It also has the ability to switch between multiple control modes to ensure stable system operation. The following details the process from three aspects: basic oil circuitry, core control logic, and key scenario actions.

[0049] I. Hydraulic Circuit Basics and Power Source: The hydraulic circuit has three main hydraulic circuits: First hydraulic circuit 1 and Second hydraulic circuit 2: both connected to the oil tank (return oil passage) of the hydraulic control system; Third hydraulic circuit 3: connected to the hydraulic accumulator of the hydraulic control system (providing high-pressure oil source). Core power source: The Third hydraulic circuit 3 controls the main oil source through an electric valve. After the electric valve opens, the high-pressure oil branches into multiple branches through the main circuit, providing power to various hydraulic components (such as digital valves, proportional valves, on / off control valves, etc.).

[0050] Oil source filtration and distribution: After passing through the electric valve, the high-pressure oil first enters the dual filter 13, where impurities are filtered out and then divided into two paths: one path supplies oil to the control elements (digital valve 11, proportional valve 10, limit switch, etc.); the other path supplies oil to the actuators (hydraulic feedback mechanism 12, auxiliary relay mechanism 16, etc.).

[0051] II. Core Control Components and Collaborative Logic: The device operates through a closed-loop logic of "control signal → valve group switching → actuator action → feedback adjustment." The functions and collaboration of key components are as follows: Control Mode Switching: Selection between digital valves and proportional valves. The proportional digital switching valve 9 is the core switching component.

[0052] When switching to digital valve 11: the A port of digital valve 11 is connected through the B port of proportional digital switching valve 9, and the digital valve 11 outputs a precise control signal;

[0053] When switching to proportional valve 10: the A port of proportional valve 10 is connected through the A port of proportional digital switching valve 9, and the proportional valve 10 outputs a continuous adjustment signal.

[0054] The dual filter 13 provides a clean oil source for both, and the return oil from the digital valve 11 and the proportional valve 10 returns to the oil tank through the first oil circuit 1.

[0055] Auxiliary switching and safety control: The auxiliary switching valve 8 is connected to the proportional digital switching valve 9 and the hydraulic feedback mechanism 12. Its P interface is connected to the B interface to form a control oil path switching. At the same time, it receives the output signal of the hydraulic feedback mechanism 12 to realize the secondary adjustment of the control signal.

[0056] The first hydraulic directional valve 4 and the second hydraulic directional valve 6 are controlled by hydraulic signals to cut off or open the oil circuit. The first hydraulic directional valve 4 controls the oil supply to the auxiliary switching valve 8; the second hydraulic directional valve 6 controls the oil supply to the second chamber of the auxiliary relay mechanism 16, indirectly regulating the piston movement. The first limit switch 5 and the second limit switch 7 are triggered by oil pressure to provide control signals to the hydraulic directional valves (such as pressure triggering of the valve core return spring), realizing action limit protection (such as cutting off the oil supply when the valve core reaches the limit position).

[0057] Actuator: Action of the auxiliary relay mechanism. The auxiliary relay mechanism 16 is the core actuator, and its piston operates through the following logic: the left side of the piston (first chamber) is connected to the first oil circuit 1 (return oil), and the right side (second chamber) is connected to high-pressure oil or return oil through the second hydraulic control directional valve 6; when high-pressure oil enters the second chamber, the piston moves to the left, driving the start-up chamber to operate (linking the start-up chamber of the start-up control valve 14); when oil returns from the second chamber, the piston resets under the action of the return oil pressure on the left or the spring force (not explicitly mentioned, but can be inferred), linking the shut-off chamber to operate.

[0058] Hydraulic feedback mechanism 12: One end is connected to the piston guide rod, and the other end is fixed. It converts the mechanical displacement of the piston into a hydraulic signal and feeds it back to the auxiliary switching valve 8 to form a closed-loop regulation (to ensure accurate piston displacement).

[0059] The function of the on / off control valve 14, and its three-chamber structure:

[0060] Constant pressure chamber: Connected to the branch of the third oil circuit 3, it maintains stable pressure and provides a reference force for the valve core;

[0061] Start-up chamber: The P port is connected to high-pressure oil. Driven by the piston of the auxiliary servo, the start-up action is triggered when high-pressure oil enters.

[0062] Shutdown chamber: The T interface is connected to the second oil circuit 2 (return oil). When the start-up chamber loses pressure, it is reset under the pressure of the constant pressure chamber, triggering the shutdown action.

[0063] Main position sensor 15: Real-time monitoring of the valve core position of the on / off control valve 14, and feedback to the control system to achieve precise positioning.

[0064] III. Typical Workflow in a Typical Scenario: Normal Start-up Control (Taking Proportional Valve Mode as an Example): The electric valve opens, and the high-pressure oil in the third oil circuit 3 is filtered by the dual filter 13 and then branched off; the proportional digital switching valve 9 switches to the proportional valve 10, and the auxiliary switching valve 8 conducts the control signal of the proportional valve 10; the proportional valve 10 outputs control oil, which enters the hydraulic feedback mechanism 12 through the proportional digital switching valve 9 and the auxiliary switching valve 8; the hydraulic feedback mechanism 12 transmits the signal to the second chamber of the auxiliary relay mechanism 16, pushing the piston to the left, and triggering the start-up by injecting oil into the start-up chamber of the linkage start-up control valve 14; the piston displacement forms a closed loop through the hydraulic feedback mechanism 12, and the main and auxiliary position sensors 15 monitor the valve core position to ensure that the start-up is in place.

[0065] Emergency stop control: When the emergency stop signal is triggered, the electric valve closes or the first hydraulic directional valve 4 operates to cut off the high-pressure oil source; the start-up chamber of the start-up control valve 14 loses pressure, and the stop-up chamber resets under the pressure of the constant pressure chamber. The T-port returns oil through the second oil circuit 2 to complete the shutdown; if a mechanical forced shutdown is required, the oil source can be manually cut off through the manual valve between the hydraulic control system and the emergency stop valve to force a restart.

[0066] Control mode switching (digital valve to proportional valve):

[0067] When the proportional digital switching valve 9 is activated, it disconnects from the digital valve 11 (B port closed) and connects to the proportional valve 10 (A port open); the oil source of the dual filter 13 is transmitted to the actuator through the proportional valve 10, the proportional digital switching valve 9, and the auxiliary switching valve 8, so as to achieve seamless switching of control modes.

[0068] Travel limit protection:

[0069] When the piston displacement of the auxiliary relay reaches its limit, the hydraulic feedback mechanism 12 triggers the second limit switch 7; the second limit switch 7 cuts off the control oil of the second hydraulic control directional valve 6, making its A interface open (connected to the return oil of the first oil circuit 1), the second chamber loses pressure, the piston stops moving, and avoids overtravel damage.

[0070] Dual-mode control: The proportional-digital switching valve enables flexible switching between digital valve (high precision) and proportional valve (continuous adjustment) to adapt to different working conditions.

[0071] Closed-loop feedback: The hydraulic feedback mechanism and the main position sensor form a dual feedback to ensure the valve core centering accuracy;

[0072] Multiple safety protections: Components such as hydraulic directional valves, limit switches, and dual filters ensure that the system can shut down or switch in time in case of abnormalities (such as overtravel or oil contamination), thus improving reliability.

[0073] In summary, compared with existing technologies, this utility model can flexibly switch between digital valve and proportional valve control modes through a proportional digital switching valve to adapt to different working conditions and requirements for valve core centering accuracy and response speed; by using a hydraulic directional valve and limit switch in conjunction, it can achieve precise control of the oil circuit and effective monitoring and feedback of the valve core centering process, thereby improving the valve core centering accuracy; by setting main and auxiliary position sensors and manual valves, it can enhance the system's operational stability and controllability, ensuring reliable valve core centering even under complex working conditions, thereby improving the overall efficiency and reliability of the hydraulic pump oil delivery system.

[0074] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A selectable valve core rebalancing device, wherein the rebalancing device is connected to both a hydraulic control system and an emergency stop valve hydraulic control system, characterized in that, The reconstructed device is provided with three oil circuits, namely the first oil circuit (1), the second oil circuit (2) and the third oil circuit (3). The first oil circuit (1) and the second oil circuit (2) are both connected to the oil tank of the oil pressure control system, and the third oil circuit (3) is connected to the oil pressure accumulator of the oil pressure control system. The main line of the third oil circuit (3) is equipped with an electric valve, and multiple branch lines are set in the oil circuit connected after the electric valve. The re-centering device includes: The power on / off control valve (14) has a constant pressure chamber, a power off chamber and a power on chamber. The constant pressure chamber is connected to a branch of the third oil circuit (3) through a pipeline. The T interface of the power off chamber is connected to the second oil circuit (2). The P interface of the power on chamber is connected to a branch of the third oil circuit (3). An auxiliary relay mechanism (16) has a piston inside its housing. The outer end of the piston extends out of the housing of the auxiliary relay mechanism (16) and connects to one end of the starting chamber. The piston is fitted with a piston guide rod. The housing of the auxiliary relay mechanism (16) is divided into a first chamber and a second chamber by the piston. The first chamber is connected to the first oil passage (1) through a pipeline. The hydraulic feedback mechanism (12) is connected at one end to the piston guide rod and fixed at the other end; A dual filter (13) is provided, with its inlet end connected to the oil circuit following the electric valve and its outlet end connected to the inlet end of the hydraulic feedback mechanism (12). A digital valve (11) has its P port connected to the oil outlet of the dual filter (13) and its T port connected to the first oil circuit (1). A proportional valve (10) has its P port connected to the oil outlet of a dual filter (13) and its T port connected to the first oil circuit (1). A proportional digital switching valve (9) is used to switch between the digital valve (11) and the proportional valve (10). Its B port is connected to the A port of the digital valve (11), and the A port of the proportional digital switching valve (9) is connected to the A port of the proportional valve (10). An auxiliary switching valve (8) is provided, with its B port connected to the P port of the proportional digital switching valve (9) and its A port connected to the oil outlet of the hydraulic feedback mechanism (12). The B port of the auxiliary switching valve (8) is connected to the P port of the auxiliary switching valve (8) via a pipeline. The first hydraulic control directional valve (4) has its B port connected to the P port of the auxiliary switching valve (8) and its A port connected to the first oil circuit (1). The first limit switch (5) has its T interface connected to the first oil circuit (1), its P interface connected to the oil outlet of the double filter (13), its B interface connected to the K end control oil port of the first hydraulic directional valve (4), and its A interface connected to the L end valve core reset spring of the first hydraulic directional valve (4). The second hydraulic directional valve (6) has its B port connected to the P port of the first hydraulic directional valve (4), its A port connected to the first oil circuit (1), and its P port connected to the second chamber of the auxiliary relay mechanism (16). The second limit switch (7) has its T interface connected to the first oil circuit (1), its P interface connected to the P interface of the first limit switch (5), its B interface connected to the L end valve core reset spring of the second hydraulic directional valve (6), and its A interface connected to the K end control oil port of the second hydraulic directional valve (6).

2. The selectable valve core rebalancing device according to claim 1, characterized in that, The on / off control valve (14) is connected to a main position sensor (15).

3. The selectable valve core rebalancing device according to claim 1, characterized in that, A manual valve is connected between the hydraulic control system and the emergency stop valve hydraulic control system.

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