Hydraulic control check valve leakage inspection device and oil circuit system

Abstract

The utility model discloses a kind of leakage inspection device of hydraulic control check valve and oil circuit system, it is related to hydraulic control system technical field, and hydraulic control check valve includes main pressure maintaining port, main control port and main oil return port, and main control port controls the bidirectional conduction of main oil return port and main pressure maintaining port;Leakage inspection device includes: first check valve and communication pipeline, and first check valve includes first oil inlet and first oil outlet, and first oil inlet is communicated with the main oil return port of hydraulic control check valve, and first oil outlet is communicated with oil tank;First oil inlet is communicated with main oil return port by communication pipeline;Communication pipeline is used to disconnect at least one of main oil return port, first oil inlet, to carry out leakage inspection of hydraulic control check valve. After adopting the leakage inspection device of hydraulic control check valve of the scheme, in leakage inspection process, oil circuit system does not need to be stopped to check, just disconnect communication pipeline and can be observed to directly judge whether there is leakage of hydraulic control check valve, can greatly improve leakage inspection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control system technology, and in particular to a hydraulic control check valve leakage detection device and oil circuit system. Background Technology

[0002] As a key control component in hydraulic control systems, the pilot-operated check valve has evolved from a traditional mechanical check valve to one with integrated pilot control functions. Early check valves could only achieve unidirectional shut-off. However, with the increasing demands for adaptability to complex operating conditions in hydraulic control systems, pilot-operated check valves have achieved bidirectional controllable flow by introducing control oil circuits, and are widely used in pressure-holding circuits in engineering machinery, metallurgical equipment, and other fields. In recent years, improvements in sealing performance, response speed, and reliability have become the focus of technological development for pilot-operated check valves, especially leakage control under high-pressure and high-frequency conditions.

[0003] Current hydraulic check valves typically consist of a valve body, a main valve core, a control piston, and a return spring. Their working principle is as follows: pressure at the control port drives the main valve core to open, allowing oil to flow from the pressure-holding port to the return port; when the control pressure is released, the main valve core closes under the spring force, achieving the pressure-holding function of the pressure-holding port. Therefore, hydraulic check valves are frequently used in oil circuit systems to achieve pressure-holding effects for specific oil circuits.

[0004] Leak detection for hydraulic check valves is a major challenge. Currently, when the hydraulic system fails to maintain pressure, it is necessary to shut down the system for investigation to determine whether the leak source is the hydraulic check valve. Furthermore, even if the leak source is determined to be the hydraulic check valve, it is difficult to intuitively judge whether the replaced hydraulic check valve can maintain pressure normally after replacement.

[0005] Therefore, there is an urgent need for a new type of hydraulic control check valve leakage detection device to intuitively determine whether there is a leak in the hydraulic control check valve without shutting down the system. Utility Model Content

[0006] The main purpose of this invention is to provide a leak detection device for a hydraulic control check valve, which aims to intuitively determine whether the hydraulic control check valve is leaking without shutting down the machine.

[0007] To achieve the above objectives, this utility model proposes a leakage detection device for a hydraulically controlled check valve. The hydraulically controlled check valve includes a main pressure holding port, a main control port, and a main return port. The main control port controls bidirectional communication between the main return port and the main pressure holding port. The leakage detection device includes a first check valve and a connecting pipeline. The first check valve includes a first inlet port and a first outlet port. The first inlet port is connected to the main return port of the hydraulically controlled check valve, and the first outlet port is connected to an oil tank. The first inlet port is connected to the main return port via the connecting pipeline. The connecting pipeline is used to disconnect from at least one of the main return port and the first inlet port to perform leakage detection on the hydraulically controlled check valve.

[0008] Optionally, the leak detection device further includes a connector, and the side wall of the connecting pipe has a connection port, with one side interface of the connector connected to the connection port.

[0009] Optionally, the leak detection device further includes a pressure testing device connected to the other side interface of the connector.

[0010] Optionally, the pressure measuring device is configured as a pressure measuring hose.

[0011] This utility model also proposes an oil circuit system, including an oil supply device, an oil tank, a booster cylinder, a reversing valve, a hydraulically controlled check valve, and a leak detection device for the hydraulically controlled check valve as described in any one of the above. The reversing valve includes a second inlet, a second outlet, a first working port, and a second working port. The second inlet is connected to the oil supply device, the second outlet is connected to the oil tank, the first working port is connected to the rod chamber of the booster cylinder, and the second working port is connected to the rodless chamber of the booster cylinder. The main control port of the hydraulically controlled check valve is connected to the first working port, the main pressure holding port of the hydraulically controlled check valve is connected to the rodless chamber of the booster cylinder, and the main return port of the hydraulically controlled check valve is connected to the first inlet of the first check valve through the connecting pipeline. The first outlet of the first check valve is connected to the oil tank.

[0012] Optionally, the oil circuit system further includes a cartridge valve, which includes a control port, a first valve port, and a second valve port. The control port is connected to the rodless chamber of the booster cylinder and the main pressure holding port. The first valve port is connected to the second working port, and the second valve port is connected to the rodless chamber of the booster cylinder.

[0013] Optionally, the oil circuit system further includes a first damping screw, which is disposed in the oil circuit between the second oil outlet and the oil tank.

[0014] Optionally, the oil circuit system further includes a second damping screw, which is disposed in the oil circuit between the rodless chamber of the booster cylinder and the control port and the main pressure holding port.

[0015] Optionally, the oil circuit system further includes a third damping screw, which is disposed in the oil circuit between the second damping screw and the control port.

[0016] Optionally, the reversing valve is configured as a three-position four-way solenoid valve.

[0017] This utility model provides a leakage detection device for a hydraulically controlled check valve. The device includes a first check valve and a connecting pipeline. The first inlet of the first check valve is connected to the main return port of the hydraulically controlled check valve via a detachable connecting pipeline, and the first outlet of the first check valve is connected to an oil tank. When the main control port of the hydraulically controlled check valve is pressurized, causing bidirectional flow between the main return port and the main pressure holding port, the oil in the main pressure holding port can be normally discharged to the oil tank through the hydraulically controlled check valve and the first check valve in sequence. During the leakage detection process, the pressurized state of the main control port can be released first, placing the hydraulically controlled check valve in a pressure holding state. Then, the connecting pipeline is disconnected from at least one of the main return port and the first inlet port. At the disconnection point, it is observed whether oil exceeding the normal leakage rate of the sample is leaking out. If oil exceeding the normal leakage rate is leaking out, it can be directly determined that the hydraulically controlled check valve is leaking; otherwise, the leakage problem can be ruled out. During the above-mentioned leak inspection process, even if the entire oil circuit system is not shut down, the oil in the tank will not flow out from the disconnection point due to the one-way conduction function of the first check valve; and based on the one-way conduction function of the hydraulic check valve in the pressure holding state, the oil in the main pressure holding port will also not flow out from the disconnection point if there is no leakage problem with the hydraulic check valve.

[0018] Therefore, by using the hydraulic control check valve leakage detection device proposed in this utility model, the operator does not need to shut down the oil circuit system for troubleshooting during the entire leakage detection process. He only needs to disconnect the connecting pipeline and observe to make a direct judgment on whether there is a leak in the hydraulic control check valve, without having to worry about the normally operating oil flowing out from the disconnected position of the connecting pipeline. This greatly improves the leakage detection efficiency and reduces the risk of misjudgment.

[0019] Furthermore, in the case where the leak detection device includes a connector and a pressure testing device, a connection port is provided on the side wall of the connecting pipeline. One side interface of the connector is connected to the connection port, and the pressure testing device is connected to the other side interface of the connector. The pressure testing device is set as a pressure testing hose. In the actual detection process, if there is a continuous flow of oil from the pressure testing hose, it can be determined that there is a leak in the hydraulic control check valve. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of an embodiment of the hydraulic control check valve leakage detection device provided by this utility model;

[0022] Figure 2 A schematic diagram of another embodiment of the hydraulic control check valve leakage detection device provided by this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the first embodiment of the oil circuit system provided by this utility model;

[0024] Figure 4 A schematic diagram of the structure of the second embodiment of the oil circuit system provided by this utility model;

[0025] Figure 5 This is a schematic diagram of the third embodiment of the oil circuit system provided by this utility model.

[0026] Explanation of icon numbers:

[0027] 1. Hydraulic control check valve leakage detection device; 101. First check valve; 102. Connecting pipeline; 103. Connector; 104. Pressure measuring equipment;

[0028] 2. Hydraulic control check valve;

[0029] 3. Oil supply device; 4. Oil tank; 5. Booster cylinder; 6. Reversing valve; 7. Cartridge valve; 8. First damping screw; 9. Second damping screw; 10. Third damping screw.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments 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 of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] As a key control component in hydraulic control systems, the pilot-operated check valve has evolved from a traditional mechanical check valve to one with integrated pilot control functions. Early check valves could only achieve unidirectional shut-off. However, with the increasing demands for adaptability to complex operating conditions in hydraulic control systems, pilot-operated check valves have achieved bidirectional controllable flow by introducing control oil circuits, and are widely used in pressure-holding circuits in engineering machinery, metallurgical equipment, and other fields. In recent years, improvements in sealing performance, response speed, and reliability have become the focus of technological development for pilot-operated check valves, especially leakage control under high-pressure and high-frequency conditions.

[0035] Current hydraulic check valves typically consist of a valve body, a main valve core, a control piston, and a return spring. Their working principle is as follows: pressure at the control port drives the main valve core to open, allowing oil to flow from the pressure-holding port to the return port; when the control pressure is released, the main valve core closes under the spring force, achieving the pressure-holding function of the pressure-holding port. Therefore, hydraulic check valves are frequently used in oil circuit systems to achieve pressure-holding effects for specific oil circuits.

[0036] Leak detection for hydraulic check valves is a major challenge. Currently, when the hydraulic system fails to maintain pressure, it is necessary to shut down the system for investigation to determine whether the leak source is the hydraulic check valve. Furthermore, even if the leak source is determined to be the hydraulic check valve, it is difficult to intuitively judge whether the replaced hydraulic check valve can maintain pressure normally after replacement.

[0037] Therefore, there is an urgent need for a new type of hydraulic control check valve leakage detection device to intuitively determine whether there is a leak in the hydraulic control check valve without shutting down the system.

[0038] Based on this, this utility model proposes a leakage detection device for a hydraulic control check valve.

[0039] Please see Figure 1 In one embodiment of this utility model, the hydraulic control check valve 2 includes a main pressure holding port, a main control port, and a main return port. The main control port controls bidirectional communication between the main return port and the main pressure holding port. The leakage detection device includes a first check valve 101 and a connecting pipe 102. The first check valve 101 includes a first inlet port and a first outlet port. The first inlet port is connected to the main return port of the hydraulic control check valve 2, and the first outlet port is connected to the oil tank 4. The first inlet port is connected to the main return port through the connecting pipe 102. The connecting pipe 102 is used to disconnect from at least one of the main return port and the first inlet port to perform leakage detection on the hydraulic control check valve 2.

[0040] The technical solution of this utility model employs a hydraulically controlled check valve leakage detection device 1. This leakage detection device includes a first check valve 101 and a connecting pipe 102. The first oil inlet of the first check valve 101 is connected to the main return oil port of the hydraulically controlled check valve 2 via the detachable connecting pipe 102, and the first oil outlet of the first check valve 101 is connected to the oil tank 4. When the main control port of the hydraulically controlled check valve 2 is pressurized, causing bidirectional flow between the main return oil port and the main pressure holding port, the oil in the main pressure holding port can be normally discharged to the oil tank 4 through the hydraulically controlled check valve 2 and the first check valve 101 in sequence. During the leak check of the hydraulic check valve 2, the pressure at the main control port can be released first, leaving the hydraulic check valve 2 in a pressure-holding state. Then, the connecting pipe 102 can be disconnected from at least one of the main return port and the first inlet port. Observe at the disconnection point whether there is oil leakage exceeding the normal leakage rate of the sample. If oil leakage exceeding the normal leakage rate of the sample is observed, it can be directly determined that the hydraulic check valve 2 is leaking; otherwise, the problem of leakage in the hydraulic check valve 2 can be ruled out. During the above leak check process, even without shutting down the entire oil circuit system, the oil in the oil tank 4 will not flow out from the disconnection point due to the one-way conduction function of the first check valve 101; and based on the one-way conduction function of the hydraulic check valve 2 in the pressure-holding state, the oil in the main pressure-holding port will also not flow out from the disconnection point if there is no leakage problem with the hydraulic check valve 2.

[0041] Therefore, by using the hydraulic control check valve leakage detection device 1 provided in this embodiment, the operator does not need to shut down the oil circuit system for troubleshooting during the entire leakage detection process. He only needs to disconnect the connecting pipe 102 and observe to make a direct judgment on whether there is a leak in the hydraulic control check valve 2, without having to worry about the normally operating oil flowing out from the disconnected position of the connecting pipe 102. This greatly improves the leakage detection efficiency and reduces the risk of misjudgment.

[0042] It can be understood that the first one-way valve 101 typically includes a first valve body, a first valve core, and a first return spring. The first valve body is provided with a first oil inlet and a first oil outlet. The first valve core is elastically connected to the first valve body through the first return spring. The first return spring is used to apply a reset force to the first valve core toward the first oil inlet. This allows oil to enter the first valve body from the first oil inlet and flow to the first oil outlet, while preventing oil from flowing from the first oil outlet to the first oil inlet, so as to achieve the one-way conduction effect of the first one-way valve 101.

[0043] In addition, as an optional implementation, the connecting pipe 102 can be a rigid pipe, such as a pipe made of stainless steel, to ensure that the connecting pipe 102 can withstand greater oil pressure. The two ends of the connecting pipe 102 can be detachably connected to the main return port and the first inlet port respectively through various connection methods. For example, the two ends of the connecting pipe 102 can be sleeved to the main return port and the first inlet port respectively, and a rubber ring or other sealing element is provided at the sleeve to achieve a sealed fit and prevent oil leakage; the two ends of the connecting pipe 102 can also be provided with adapters to detachably connect to the main return port and the first inlet port; the two ends of the connecting pipe 102 can be provided with a first thread, and the main return port and the first inlet port are provided with corresponding second threads, with the first thread and the second thread engaging for connection. Of course, the connecting pipe 102 can also be detachably connected to the main return port and the first inlet port in other ways, which will not be elaborated here.

[0044] Please see Figure 2 Furthermore, the leak detection device also includes a connector 103. A connection port is provided on the side wall of the connecting pipe 102, and one side interface of the connector 103 connects to the connection port. By setting the connector 103, during the process of checking whether the hydraulic control check valve 2 is leaking, it is not necessary to disconnect the connection between the connecting pipe 102 and the main return port and the first inlet port. The operator can directly observe from the other side interface of the connector 103 whether oil is leaking at a rate exceeding the normal leakage rate of the sample, thus determining whether the hydraulic control check valve 2 is leaking. This reduces the workload of dismantling the connecting pipe 102 and further improves the efficiency of leak detection.

[0045] Please see Figure 2Furthermore, the leak detection device also includes a pressure measuring device 104, which is connected to the other side of the connector 103. Since the pressure measuring device 104 can measure the pressure of the oil, by connecting the pressure measuring device 104 to the other side of the connector 103, the oil pressure in the connecting pipeline 102 can be measured. When the pressure measuring device 104 detects an oil pressure exceeding a preset range, it indicates a leak in the connecting pipeline 102, thus confirming a leak in the hydraulic check valve 2. This solution not only allows for a direct visual assessment of whether the hydraulic check valve 2 is leaking through the pressure reading of the pressure measuring device 104, but also allows for determination of the severity of the leak. This facilitates operators in deciding whether to immediately shut down the oil system for replacement and maintenance of the hydraulic check valve 2 based on the severity of the leak.

[0046] In one optional implementation, the pressure testing device 104 can be a pressure testing hose. Since the pressure testing hose has a wide operating pressure range, it can be used to test the pressure at various points in the oil circuit system. Furthermore, the pressure testing hose has the characteristics of reasonable structure, reliable sealing, and ease of use, making it suitable as the pressure testing device 104 in this embodiment. During actual testing, if there is a continuous flow of oil from the pressure testing hose, it can be determined that the hydraulic check valve 2 is leaking.

[0047] Please see Figures 3 to 5 This utility model also proposes an oil circuit system, which includes an oil supply device 3, an oil tank 4, a booster cylinder 5, a reversing valve 6, a hydraulic control check valve 2, and the aforementioned hydraulic control check valve leakage detection device 1. The specific structure of the hydraulic control check valve leakage detection device 1 is as described in the above embodiments. Since this oil circuit system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The reversing valve 6 includes a second oil inlet P, a second oil outlet T, a first working oil port A1, and a second working oil port B1. The second oil inlet P is connected to the oil supply device 3, the second oil outlet T is connected to the oil tank 4, the first working oil port A1 is connected to the rod chamber of the booster cylinder 5, and the second working oil port B1 is connected to the rodless chamber of the booster cylinder 5. The main control port of the hydraulic check valve 2 is connected to the first working oil port A1, the main pressure holding port of the hydraulic check valve 2 is connected to the rodless chamber of the booster cylinder 5, and the main return port of the hydraulic check valve 2 is connected to the first oil inlet of the first check valve 101 through the connecting pipeline 102. The first oil outlet of the first check valve 101 is connected to the oil tank 4.

[0048] It is understood that the booster cylinder 5 in this embodiment is used to boost the pressure of the clamping cylinder in the die-casting machine to ensure that the clamping force reaches the preset clamping requirements. The connection between the reversing valve 6 and the booster cylinder 5 allows the oil supply device 3 to supply oil to the rod chamber or rodless chamber of the booster cylinder 5 at different stages, thereby driving the piston rod of the booster cylinder 5 to extend or retract.

[0049] Please see Figures 3 to 5 Furthermore, the oil circuit system also includes a cartridge valve 7, which includes a control port X, a first valve port A2, and a second valve port B2. The control port X is connected to the rodless chamber of the booster cylinder 5, the first valve port A2 is connected to the second working port, and the second valve port B2 is connected to the rodless chamber of the booster cylinder 5.

[0050] The valve core of cartridge valve 7 divides its valve sleeve into a first chamber and a second chamber. The first chamber is connected to the control port X, and the second chamber is connected to the first valve port A2 and the second valve port B2. The first chamber is filled with pilot oil. Under the pressure of the pilot oil, the valve core of cartridge valve 7 is in the first position and blocks the oil passage in the second chamber. At this time, the first valve port A2 and the second valve port B2 are not connected. When the pilot oil in the first chamber is discharged outward through the control port X, the pressure of the pilot oil on the valve core of cartridge valve 7 decreases. The valve core will move to the second position under the external force provided by the spring and other devices. At this time, the valve core no longer blocks the oil passage in the second chamber. That is, the first valve port A2 and the second valve port B2 are connected, and the oil can flow between the first valve port A2 and the second valve port B2.

[0051] Based on the above embodiments, the specific working process of the oil circuit system is as follows;

[0052] like Figure 4 As shown, when the reversing valve 6 switches to the first working position, connecting the second oil inlet P with the first working oil port A1 and the second oil outlet T with the second working oil port B1, the oil supply device 3 supplies oil to the second oil inlet P of the reversing valve 6. The oil flows from the second oil inlet P to the first working oil port A1, and then flows to the rod chamber of the booster cylinder 5 and the main control port of the hydraulic check valve 2, respectively. The oil flowing into the rod chamber of the booster cylinder 5 will push the piston rod of the booster cylinder 5 to move to the right; the oil flowing to the main control port of the hydraulic check valve 2... The hydraulic system enables bidirectional communication between the main pressure holding port and the main return port of the hydraulic control check valve 2, allowing the pilot oil of the cartridge valve 7 to flow out from the control port X and sequentially pass through the main pressure holding port, the main return port, and the first check valve 101 to be discharged into the oil tank 4. This puts the first valve port A2 and the second valve port B2 of the cartridge valve 7 in a bidirectional communication state. At this time, the oil in the rodless chamber of the booster cylinder 5 is squeezed outward by the piston rod and discharged outward, sequentially passing through the second valve port B2, the first valve port A2, the second working oil port B1, and the second outlet port T before being discharged into the oil tank 4.

[0053] like Figure 5 As shown, when the reversing valve 6 switches to the second working position, connecting the second inlet P with the second working port B1 and the second outlet T with the first working port A1, the oil in the rod chamber of the booster cylinder 5, under pressure, flows sequentially through the first working port A1 and the second outlet T to the oil tank 4. Simultaneously, the oil in the rod chamber of the booster cylinder 5 flows to the main control port of the hydraulic check valve 2. The oil flowing to the main control port of the hydraulic check valve 2 causes bidirectional connection between the main pressure holding port and the main return port of the hydraulic check valve 2, allowing the pilot oil of the cartridge valve 7 to be supplied from... The oil flows out from the control port X and passes through the main pressure holding port, the main return port, and the first check valve 101 in sequence to be discharged into the oil tank 4, so that the first valve port A2 and the second valve port B2 of the cartridge valve 7 are in a bidirectional flow state; at this time, the oil supply device 3 supplies oil to the second oil inlet P of the reversing valve 6, and the oil flows from the second oil inlet P to the second working oil port B1, and passes through the first valve port A2 and the second valve port B2 in sequence before being supplied into the rodless chamber of the booster cylinder 5, thereby driving the piston rod of the booster cylinder 5 to move to the left, and further squeezing the oil in the rodless chamber of the booster cylinder 5 to be discharged outward.

[0054] Please see Figures 3 to 5 Furthermore, in an embodiment of this utility model, the oil circuit system further includes a first damping screw 8, which is disposed in the oil circuit between the second oil outlet and the oil tank 4. It is understood that the first damping screw 8 has a flow hole inside, and the diameter of this flow hole is smaller than the diameter of the oil circuit between the second oil outlet and the oil tank 4. Therefore, when the oil flows through the first damping screw 8, the first damping screw 8 acts as a damper, reducing the oil flow speed in the oil circuit between the second oil outlet and the oil tank 4, and preventing the oil from splashing due to excessively fast flow towards the oil tank 4.

[0055] Please see Figures 3 to 5 Furthermore, in an embodiment of this utility model, the oil circuit system further includes a second damping screw 9, which is disposed in the oil circuit between the rodless chamber of the booster cylinder 5 and the control port X and the main pressure holding port. Similarly, the second damping screw 9 also has a flow hole inside, and the diameter of the flow hole is smaller than the pipe diameter of the oil circuit between the rodless chamber of the booster cylinder 5 and the control port X and the main pressure holding port. Therefore, when the oil flows through the second damping screw 9, the second damping screw 9 plays a role similar to damping, which can reduce the oil flow speed in the oil circuit between the rodless chamber of the booster cylinder 5 and the control port X and the main pressure holding port, and avoid damage to the rodless chamber of the booster cylinder 5, the cartridge valve 7, and the hydraulic check valve 2 due to excessively high oil speed and pressure.

[0056] Please see Figures 3 to 5Furthermore, in an embodiment of this utility model, the oil circuit system further includes a third damping screw 10, which is disposed in the oil circuit between the second damping screw 9 and the control port X. Similarly, the third damping screw 10 also has a flow hole inside, and the diameter of the flow hole is smaller than the diameter of the oil circuit between the second damping screw 9 and the control port X. Therefore, when the oil flows through the third damping screw 10, the third damping screw 10 plays a role similar to damping, which can reduce the oil flow speed in the oil circuit between the second damping screw 9 and the control port X, and prevent the oil speed from being too fast and the pressure from being too high, which could damage the cartridge valve 7.

[0057] In one optional implementation, the directional valve 6 is configured as a three-position four-way solenoid valve. Because the three-position four-way solenoid valve uses an electromagnet to directly drive the main valve core, it can significantly reduce the response time, making it particularly suitable for high-frequency directional switching conditions. Furthermore, the three-position four-way solenoid valve has low energy consumption, making it suitable as the directional valve 6 in the oil circuit system of this embodiment.

[0058] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A leakage detection device for a hydraulically controlled check valve, characterized in that, The hydraulic check valve includes a main pressure holding port, a main control port, and a main oil return port. The main control port controls the bidirectional flow between the main oil return port and the main pressure holding port. The leak detection device includes: The first check valve includes a first oil inlet and a first oil outlet. The first oil inlet is connected to the main return port of the hydraulic check valve, and the first oil outlet is connected to the oil tank. A connecting pipeline is provided, wherein the first oil inlet is connected to the main oil return port via the connecting pipeline; the connecting pipeline is used to disconnect from at least one of the main oil return port and the first oil inlet port in order to perform a leak check on the hydraulic control check valve.

2. The leakage detection device for a hydraulically controlled check valve as described in claim 1, characterized in that, The leak detection device also includes a connector, and a connection port is provided on the side wall of the connecting pipe. One side interface of the connector is connected to the connection port.

3. The leakage detection device for a hydraulically controlled check valve as described in claim 2, characterized in that, The leak detection device also includes a pressure testing device, which is connected to the other side interface of the connector.

4. The leakage detection device for a hydraulically controlled check valve as described in claim 3, characterized in that, The pressure measuring device is configured as a pressure measuring hose.

5. An oil circuit system, characterized in that, It includes an oil supply device, an oil tank, a booster cylinder, a reversing valve, a hydraulic check valve, and a hydraulic check valve leakage detection device as described in any one of claims 1 to 4, wherein, The reversing valve includes a second oil inlet, a second oil outlet, a first working oil port, and a second working oil port. The second oil inlet is connected to the oil supply device, the second oil outlet is connected to the oil tank, the first working oil port is connected to the rod chamber of the booster cylinder, and the second working oil port is connected to the rodless chamber of the booster cylinder. The main control port of the hydraulic check valve is connected to the first working oil port, the main pressure holding port of the hydraulic check valve is connected to the rodless chamber of the booster cylinder, and the main return oil port of the hydraulic check valve is connected to the first oil inlet of the first check valve through the connecting pipeline. The first oil outlet of the first one-way valve is connected to the oil tank.

6. The oil circuit system as described in claim 5, characterized in that, The oil circuit system also includes a cartridge valve, which includes a control port, a first valve port, and a second valve port. The control port is connected to the rodless chamber of the booster cylinder and the main pressure holding port. The first valve port is connected to the second working port, and the second valve port is connected to the rodless chamber of the booster cylinder.

7. The oil circuit system as described in claim 6, characterized in that, The oil circuit system also includes a first damping screw, which is disposed in the oil circuit between the second oil outlet and the oil tank.

8. The oil circuit system as described in claim 6, characterized in that, The oil circuit system also includes a second damping screw, which is disposed in the oil circuit between the rodless chamber of the booster cylinder and the control port and the main pressure holding port.

9. The oil circuit system as described in claim 8, characterized in that, The oil circuit system also includes a third damping screw, which is disposed in the oil circuit between the second damping screw and the control port.

10. The oil circuit system as described in any one of claims 5 to 9, characterized in that, The reversing valve is configured as a three-position four-way solenoid valve.

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