A pressure relief and buffering structure for a side shift oil cylinder
By using left and right one-way valves in conjunction with left and right rods in the side-moving cylinder, the problems of high machining accuracy requirements and unstable buffering effect of the buffer structure are solved, thereby achieving stability of the buffering effect and reducing machining difficulty.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HUACHANG HYDRAULIC MASCH CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-06-09
AI Technical Summary
The existing side-shifting cylinder's buffer structure requires high machining accuracy for the outer circle of the buffer sleeve and the mating groove, making it difficult to accurately quantify the clearance range, resulting in unstable buffering effect with large fluctuations.
The design employs two check valves on the left and right sides in conjunction with the left and right rods. The opening and closing of the check valves achieves bidirectional buffering, eliminating the need for a buffer sleeve and high-precision machining structure. It uses commonly available check valves for installation.
The use of a one-way valve simplifies the assembly process, achieving stable buffering performance and reducing processing difficulty. It also provides good and stable buffering performance.
Smart Images
Figure CN224339262U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of side-shifting cylinder buffer technology, specifically to a pressure relief buffer structure for a side-shifting cylinder. Background Technology
[0002] Currently, the buffer structure of side-shifting cylinders on the market generally adopts the method of adding a buffer sleeve between the piston and the guide sleeve. This buffer structure has high requirements for the machining accuracy of the outer circle of the buffer sleeve and the mating groove, the gap range is difficult to quantify precisely, the buffering effect is unstable and fluctuates greatly.
[0003] For example, Chinese Patent Publication No. CN113757213A, entitled "A Hydraulic Cylinder Guide Sleeve Buffer Device," includes a hydraulic guide sleeve, a piston rod, and a moving piston. A first buffer end cap and a second buffer end cap are respectively installed at both ends of the hydraulic guide sleeve. A first buffer septum and a second buffer septum are slidably installed on the inner sides of the first and second buffer end caps, respectively. A through hole is opened on one side of the first and second buffer end caps, and a filling valve hole is fixedly installed thereon. A threaded sleeve cap is threaded onto the outer side of the filling valve hole. The interiors of the first and second buffer end caps are filled with damping fluid. This hydraulic cylinder guide sleeve buffer device uses a first buffer septum and a second buffer septum (equivalent to a buffer sleeve), and it also suffers from the aforementioned shortcomings.
[0004] In view of this, how to design a buffer structure that can not only reduce the requirements for machining accuracy to reduce the manufacturing difficulty, but also provide a stable buffering effect has become an urgent problem to be solved. Utility Model Content
[0005] The purpose of this invention is to provide a pressure relief buffer structure for a side-moving hydraulic cylinder that not only reduces the requirements for machining accuracy, thus reducing manufacturing difficulty, but also provides good and stable buffering effect.
[0006] The technical solution of this utility model is:
[0007] A pressure relief buffer structure for a side-shifting hydraulic cylinder includes:
[0008] The cylinder body has a partition in the middle that divides the inner cavity of the cylinder body into a left cavity and a right cavity, and the partition has a connecting hole that connects the left cavity and the right cavity.
[0009] The left rod is slidably connected to the left end of the cylinder; the right rod is slidably connected to the right end of the cylinder.
[0010] The left check valve is sealed to the left end of the connecting hole; the right check valve is sealed to the right end of the connecting hole.
[0011] The left pusher is located on the valve core and / or the end of the left rod of the left check valve, and can push open the valve core of the left check valve.
[0012] The right pusher is located on the valve core and / or the end of the right rod of the right check valve, and can push open the valve core of the right check valve.
[0013] When the pressurized oil enters the left chamber, the left check valve opens and the right check valve closes. The cylinder slides to the right rod side. During this process, the right rod can push open the valve core of the right check valve through the right pusher, so that the right check valve opens.
[0014] When pressurized hydraulic fluid enters the right chamber, the right check valve opens and the left check valve closes. The cylinder body slides towards the left rod. During this process, the left rod can push open the valve core of the left check valve via the left pusher, thus opening the left check valve. The specific operation of a pressure relief buffer structure for a side-shifting cylinder in this solution is as follows.
[0015] The left and right rods are fixedly installed, for example, the left and right rods are fixedly mounted on a fixed external frame.
[0016] When pressurized hydraulic fluid enters the left chamber, the left check valve opens under the action of the hydraulic fluid, while the right check valve remains closed (no pressure in the right chamber). The cylinder body slides towards the right rod under the action of the hydraulic fluid. As the cylinder body slides towards the right rod, the right check valve gradually approaches the right rod. When the right rod pushes open the valve core of the right check valve via the right pusher, the right check valve opens. At this time, the pressurized hydraulic fluid in the left chamber of the cylinder enters the right chamber through the connecting hole and flows back into the oil reservoir through the right chamber, thus balancing the pressure between the left and right chambers of the cylinder and beginning to release pressure, thereby reducing the cylinder's operating speed and achieving a buffering effect that is both effective and stable.
[0017] Similarly, when pressurized hydraulic fluid enters the right chamber, the right check valve opens under the action of the pressurized hydraulic fluid, while the left check valve remains closed (no pressure in the left chamber). The cylinder body slides towards the left rod under the action of the pressurized hydraulic fluid. As the cylinder body slides towards the left rod, the left check valve gradually approaches the left rod. When the left rod pushes open the valve core of the left check valve through the left pusher, the left check valve opens. At this time, the pressurized hydraulic fluid in the right chamber of the cylinder body enters the left chamber of the cylinder body through the connecting hole and flows back into the oil reservoir through the left chamber, thereby balancing the pressure between the left and right chambers of the cylinder body and beginning to depressurize, thus reducing the cylinder body's operating speed and achieving a buffering effect. The buffering effect is good and stable.
[0018] On the other hand, compared with the buffer structure of the side-shifting cylinder on the market, which uses a buffer sleeve between the piston and the guide sleeve, the buffer sleeve has high requirements for machining accuracy of the outer circle and the mating buffer sleeve, the gap range is difficult to accurately measure, and the buffering effect is unstable and fluctuates greatly. This solution achieves bidirectional buffering by using two one-way valves on the left and right sides in conjunction with the left and right rods. It eliminates the need for a buffer sleeve, and correspondingly eliminates the need for structures with high machining accuracy requirements such as the buffer sleeve and grooves. The one-way valve is easy to manufacture, does not have high machining accuracy requirements, and is a common valve body on the market, which can be directly purchased and installed. Therefore, the pressure relief buffer structure for the side-shifting cylinder in this solution is easy to manufacture and assemble, which can reduce the machining accuracy requirements and thus reduce the manufacturing difficulty.
[0019] Preferably, the valve core of the left check valve faces the left rod, and the valve core has a left protrusion extending towards the left rod, extending to the outside of the left check valve. This left protrusion constitutes the left pusher. Thus, when pressurized oil enters the right chamber, as the cylinder slides towards the left rod, the left rod can push open the valve core of the left check valve via the left pusher, thereby opening the left check valve. This balances the pressure between the left and right chambers of the cylinder and begins to release pressure, reducing the cylinder's operating speed and achieving a buffering effect that is both effective and stable.
[0020] Preferably, the valve core of the left check valve faces the left rod, and the end of the left rod facing the left check valve has a left protrusion, which constitutes the left pusher. Thus, when pressurized oil enters the right chamber, as the cylinder slides towards the left rod, the left rod can push open the valve core of the left check valve through the left pusher, thereby opening the left check valve. This balances the pressure between the left and right chambers of the cylinder and begins to release pressure, reducing the cylinder's operating speed and achieving a buffering effect that is both effective and stable.
[0021] Preferably, the valve core of the right check valve faces the right rod, and the valve core has a right protrusion extending towards the right rod, extending to the outside of the right check valve. This right protrusion constitutes the right pusher. Thus, when pressurized oil enters the left chamber, as the cylinder slides towards the right rod, the right rod can push open the valve core of the right check valve via the right pusher, thereby opening the right check valve. This balances the pressure between the left and right chambers of the cylinder and begins to release pressure, reducing the cylinder's operating speed and achieving a buffering effect that is both effective and stable.
[0022] Preferably, the valve core of the right check valve faces the right rod, and the end of the right rod facing the right check valve has a right protrusion, which constitutes the right pusher. Thus, when pressurized oil enters the left chamber, as the cylinder slides towards the right rod, the right rod can push open the valve core of the right check valve through the right pusher, thereby opening the right check valve. This balances the pressure between the left and right chambers of the cylinder and begins to release pressure, reducing the cylinder's operating speed and achieving a buffering effect that is both effective and stable.
[0023] Preferably, the cylinder block is provided with a left oil passage hole and a right oil passage hole, the left oil passage hole is connected to the left cavity, and the right oil passage hole is connected to the right cavity, and the left rod and the right rod are coaxially distributed with the cylinder block.
[0024] Preferably, a sealing structure is provided between the left rod and the cylinder body, and another sealing structure is provided between the left rod and the cylinder body. The sealing structure includes a dustproof ring, a shaft seal, and a support sleeve distributed sequentially along the cylinder body axis. The dustproof ring in the sealing structure can prevent dust from entering; the shaft seal can seal the oil to prevent oil leakage and further prevent external dust from entering; the support sleeve can guide and support the left and right rods.
[0025] Preferably, the left check valve is connected to the left end of the connecting hole via a threaded seal. This facilitates the installation, removal, and replacement of the left check valve.
[0026] Preferably, the right-hand check valve is connected to the right end of the connecting hole via a threaded seal. This facilitates the installation, removal, and replacement of the right-hand check valve.
[0027] The beneficial effects of this utility model are as follows: By using two one-way valves on the left and right sides in conjunction with the left and right rods, bidirectional buffering is achieved, which eliminates the need for the buffer sleeve in the buffer structure of the side-moving cylinder in the prior art, and correspondingly eliminates the need for structures with high machining precision requirements such as the buffer sleeve and groove; the one-way valve is easy to manufacture, does not require high machining precision, and the one-way valve is a common valve body on the market, which can be directly purchased and installed. Therefore, the pressure relief buffer structure for the side-moving cylinder of this utility model is easy to process and assemble, which can reduce the machining precision requirements and thus reduce the manufacturing difficulty; and the buffering effect is good and stable. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of a pressure relief buffer structure for a side-shifting hydraulic cylinder according to the present invention.
[0029] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.
[0030] In the picture:
[0031] Cylinder block 1, left cavity 1.1, right cavity 1.2, left oil passage 1.3, right oil passage 1.4;
[0032] Left rod 2;
[0033] Right rod 3;
[0034] Left check valve 4, valve core 4.1;
[0035] Right check valve 5;
[0036] Partition 6;
[0037] Connecting hole 7;
[0038] Dustproof ring 8;
[0039] Shaft seal 9;
[0040] Support sleeve 10;
[0041] Left push piece 11;
[0042] Right push piece 12. Detailed Implementation
[0043] Specific Implementation Example 1, such as Figure 1 , Figure 2 As shown, a pressure relief buffer structure for a side-shifting hydraulic cylinder includes a cylinder body 1, a left rod 2, a right rod 3, a left one-way valve 4, a right one-way valve 5, a left pusher 11, and a right pusher 12. A partition 6 is provided in the middle of the cylinder body 1, dividing the inner cavity of the cylinder body 1 into a left cavity 1.1 and a right cavity 1.2. The partition 6 has a connecting hole 7 that connects the left cavity 1.1 and the right cavity 1.2. A left oil passage 1.3 and a right oil passage 1.4 are provided on the cylinder body 1. The left oil passage 1.3 connects to the left cavity 1.1, and the right oil passage 1.4 connects to the right cavity 1.2.
[0044] Left rod 2 is slidably connected to the left end of cylinder 1. Right rod 3 is slidably connected to the right end of cylinder 1. Left check valve 4 is sealed to the left end of connecting hole 7. Pressurized oil in left chamber 1.1 can enter connecting hole 7 through left check valve 4. Right check valve 5 is sealed to the right end of connecting hole 7. Pressurized oil in right chamber 1.2 can enter connecting hole 7 through right check valve 5.
[0045] The left pusher 11 is disposed on the valve core 4.1 and / or the end of the left rod 2 of the left one-way valve 4, and can push open the valve core 4.1 of the left one-way valve 4. The right pusher 12 is disposed on the valve core and / or the end of the right rod 3 of the right one-way valve 5, and can push open the valve core of the right one-way valve 5.
[0046] The specific operation of a pressure relief buffer structure for a side-shifting hydraulic cylinder in this embodiment is as follows:
[0047] The left rod 2 and the right rod 3 are fixedly installed, for example, the left rod 2 and the right rod 3 are fixedly installed on a fixed external frame.
[0048] When pressurized hydraulic fluid enters the left chamber 1.1 through the left oil passage 1.3, the left check valve 4 opens under the action of the pressurized hydraulic fluid, while the right check valve 5 remains closed (there is no pressure in the right chamber 1.2). The cylinder 1 slides towards the right rod 3 under the action of the pressurized hydraulic fluid. During this sliding motion, the right check valve 5 gradually approaches the right rod 3. When the right rod 3 pushes open the valve core of the right check valve 5 via the right pusher 12, the right check valve 5 opens. At this time, the pressurized hydraulic fluid in the left chamber 1.1 of the cylinder 1 enters the right chamber 1.2 of the cylinder 1 through the connecting hole 7, and flows back into the oil reservoir through the right chamber 1.2 and the right oil passage 1.4, thus balancing the pressure between the left chamber 1.1 and the right chamber 1.2 of the cylinder 1 and beginning to release pressure, thereby reducing the operating speed of the cylinder 1 and achieving a buffering effect. This buffering effect is good and stable.
[0049] Similarly, when pressurized oil enters the right chamber 1.2 through the right oil passage 1.4, the right check valve 5 opens under the action of the pressurized oil, while the left check valve 4 remains closed (there is no pressure in the left chamber 1.1). The cylinder 1 slides towards the left rod 2 under the action of the pressurized oil. As the cylinder 1 slides towards the left rod 2, the left check valve 4 gradually approaches the left rod 2. When the left rod 2 pushes open the valve core of the left check valve 4 through the left pusher 11, the left check valve 4 opens. At this time, the pressurized oil in the right chamber 1.2 of the cylinder 1 enters the left chamber 1.1 of the cylinder 1 through the connecting hole 7, and flows back into the oil reservoir through the left chamber 1.1 and the left oil passage 1.3, thereby balancing the pressure between the left chamber 1.1 and the right chamber 1.2 of the cylinder 1 and starting to depressurize, so as to reduce the running speed of the cylinder 1 and achieve a buffering effect. The buffering effect is good and stable.
[0050] On the other hand, compared with the buffer structure of the side-shifting cylinder on the market, which uses a buffer sleeve between the piston and the guide sleeve, the buffer sleeve has high requirements for machining accuracy of the outer circle and the mating buffer sleeve, the gap range is difficult to accurately measure, and the buffering effect is unstable and fluctuates greatly. This solution achieves bidirectional buffering by using two one-way valves on the left and right sides in conjunction with the left and right rods 3. It eliminates the need for a buffer sleeve, and correspondingly eliminates the need for structures with high machining accuracy requirements such as the buffer sleeve and groove. The one-way valve is easy to manufacture, does not have high machining accuracy requirements, and is a common valve body on the market, which can be directly purchased and installed. Therefore, the pressure relief buffer structure for the side-shifting cylinder in this solution is easy to manufacture and assemble, which can reduce the machining accuracy requirements and thus reduce the manufacturing difficulty.
[0051] Specific embodiment two, such as Figure 1 , Figure 2As shown, a pressure relief buffer structure for a side-shifting hydraulic cylinder includes a cylinder body 1, a left rod body 2, a right rod body 3, a left one-way valve 4, a right one-way valve 5, a left pusher 11, and a right pusher 12.
[0052] The cylinder body 1 has a partition 6 in the middle that divides the inner cavity of the cylinder body 1 into a left cavity 1.1 and a right cavity 1.2. The partition 6 has a connecting hole 7 that connects the left cavity 1.1 and the right cavity 1.2. The cylinder body 1 has a left oil passage hole 1.3 and a right oil passage hole 1.4. The left oil passage hole 1.3 connects to the left cavity 1.1, and the right oil passage hole 1.4 connects to the right cavity 1.2.
[0053] Left rod 2 is slidably connected to the left end of cylinder 1. Right rod 3 is slidably connected to the right end of cylinder 1. Left rod 2 and right rod 3 are coaxially distributed with cylinder 1.
[0054] The left check valve 4 is sealed and connected to the left end of the connecting hole 7. Pressurized oil in the left chamber 1.1 can enter the connecting hole 7 through the left check valve 4. The right check valve 5 is sealed and connected to the right end of the connecting hole 7. Pressurized oil in the right chamber 1.2 can enter the connecting hole 7 through the right check valve 5. The valve core of the left check valve 4 faces the left stem 2. The valve core of the right check valve 5 faces the right stem 3.
[0055] The left pusher 11 is disposed on the valve core 4.1 and / or the end of the left rod 2 of the left one-way valve 4, and can push open the valve core 4.1 of the left one-way valve 4. The right pusher 12 is disposed on the valve core and / or the end of the right rod 3 of the right one-way valve 5, and can push open the valve core of the right one-way valve 5.
[0056] When the pressurized oil enters the left chamber 1.1, the left check valve 4 opens and the right check valve 5 closes. The cylinder body 1 slides to the right rod body 3. During this process, the right rod body 3 can push open the valve core of the right check valve 5 through the right pusher 12, so that the right check valve 5 opens.
[0057] When the pressurized oil enters the right chamber 1.2, the right check valve 5 opens and the left check valve 4 closes. The cylinder 1 slides to the left rod 2. During this process, the left rod 2 can push open the valve core of the left check valve 4 through the left pusher 11, so that the left check valve 4 opens.
[0058] The specific operation of a pressure relief buffer structure for a side-shifting hydraulic cylinder in this embodiment is as follows:
[0059] The left rod 2 and the right rod 3 are fixedly installed, for example, the left rod 2 and the right rod 3 are fixedly installed on a fixed external frame.
[0060] When pressurized hydraulic fluid enters the left chamber 1.1 through the left oil passage 1.3, the left check valve 4 opens under the action of the pressurized hydraulic fluid, while the right check valve 5 remains closed (there is no pressure in the right chamber 1.2). The cylinder 1 slides towards the right rod 3 under the action of the pressurized hydraulic fluid. During this sliding motion, the right check valve 5 gradually approaches the right rod 3. When the right rod 3 pushes open the valve core of the right check valve 5 via the right pusher 12, the right check valve 5 opens. At this time, the pressurized hydraulic fluid in the left chamber 1.1 of the cylinder 1 enters the right chamber 1.2 of the cylinder 1 through the connecting hole 7, and flows back into the oil reservoir through the right chamber 1.2 and the right oil passage 1.4, thus balancing the pressure between the left chamber 1.1 and the right chamber 1.2 of the cylinder 1 and beginning to release pressure, thereby reducing the operating speed of the cylinder 1 and achieving a buffering effect. This buffering effect is good and stable.
[0061] Similarly, when pressurized oil enters the right chamber 1.2 through the right oil passage 1.4, the right check valve 5 opens under the action of the pressurized oil, while the left check valve 4 remains closed (there is no pressure in the left chamber 1.1). The cylinder 1 slides towards the left rod 2 under the action of the pressurized oil. As the cylinder 1 slides towards the left rod 2, the left check valve 4 gradually approaches the left rod 2. When the left rod 2 pushes open the valve core of the left check valve 4 through the left pusher 11, the left check valve 4 opens. At this time, the pressurized oil in the right chamber 1.2 of the cylinder 1 enters the left chamber 1.1 of the cylinder 1 through the connecting hole 7, and flows back into the oil reservoir through the left chamber 1.1 and the left oil passage 1.3, thereby balancing the pressure between the left chamber 1.1 and the right chamber 1.2 of the cylinder 1 and starting to depressurize, so as to reduce the running speed of the cylinder 1 and achieve a buffering effect. The buffering effect is good and stable.
[0062] On the other hand, compared with the buffer structure of the side-shifting cylinder on the market, which uses a buffer sleeve between the piston and the guide sleeve, the buffer sleeve has high requirements for machining accuracy of the outer circle and the mating buffer sleeve, the gap range is difficult to accurately measure, and the buffering effect is unstable and fluctuates greatly. This solution achieves bidirectional buffering by using two one-way valves on the left and right sides in conjunction with the left and right rods 3. It eliminates the need for a buffer sleeve, and correspondingly eliminates the need for structures with high machining accuracy requirements such as the buffer sleeve and groove. The one-way valve is easy to manufacture, does not have high machining accuracy requirements, and is a common valve body on the market, which can be directly purchased and installed. Therefore, the pressure relief buffer structure for the side-shifting cylinder in this solution is easy to manufacture and assemble, which can reduce the machining accuracy requirements and thus reduce the manufacturing difficulty.
[0063] Specifically, such as Figure 1As shown, a sealing structure is provided between the left rod 2 and the cylinder 1. The sealing structure includes a dustproof ring 8, a shaft seal 9, and a support sleeve 10, which are sequentially distributed along the axial direction of the cylinder 1. In this embodiment, the inner wall of the cylinder 1 is provided with corresponding dustproof ring grooves, shaft seal grooves, and support sleeve grooves; the dustproof ring 8 is installed in the corresponding dustproof ring groove, the shaft seal 9 is installed in the corresponding shaft seal groove, and the support sleeve 10 is installed in the corresponding support sleeve groove. The dustproof ring 8, shaft seal 9, and support sleeve 10 between the left rod 2 and the cylinder 1 are all fitted onto the left rod 2. The dustproof ring 8, shaft seal 9, and support sleeve 10 between the right rod 3 and the cylinder 1 are all fitted onto the right rod 3. The dust seal 8 in the sealing structure can prevent dust from entering; the shaft seal 9 can seal the oil to prevent oil from overflowing; and can further prevent dust from entering; the support sleeve 10 can guide and support the left rod 2 and the right rod 3.
[0064] Furthermore, such as Figure 1 , Figure 2 As shown, the left check valve 4 is connected to the left end of the connecting hole 7 via a threaded seal. The right check valve 5 is connected to the right end of the connecting hole 7 via a threaded seal. This facilitates the installation, removal, and replacement of the left check valve 4 and the right check valve 5.
[0065] It should be noted that the left check valve 4 and the right check valve 5 can also be sealed and connected to the connecting hole 7 in other ways. For example, the left check valve 4 and the connecting hole 7 can be connected by an interference fit, and a sealing ring can be provided between the left check valve 4 and the connecting hole 7. The right check valve 5 and the connecting hole 7 can also be connected by an interference fit, and a sealing ring can be provided between the right check valve 5 and the connecting hole 7.
[0066] Furthermore, the left pusher 11 is disposed on the valve core and / or the end of the left rod 2 of the left one-way valve 4, and can push open the valve core of the left one-way valve 4. Specifically,
[0067] In one example, such as Figure 2 As shown, the valve core of the left one-way valve 4 faces the left rod 2. The valve core of the left one-way valve 4 has a left protrusion that protrudes towards the left rod 2, extending to the outside of the left one-way valve 4. This left protrusion constitutes the left pusher 11. The left protrusion and the valve core of the left one-way valve 4 are integrally formed, or the left protrusion is fixed to the valve core of the left one-way valve 4 by bolts, welding, or bonding. Thus, when pressurized oil enters the right chamber 1.2, during the process of the cylinder 1 sliding towards the left rod 2, the left rod 2 can push open the valve core of the left one-way valve 4 through the left pusher 11, thereby opening the left one-way valve 4, balancing the pressure between the left chamber 1.1 and the right chamber 1.2 of the cylinder 1, and starting to release pressure, thereby reducing the operating speed of the cylinder 1 and achieving a buffering effect. The buffering effect is good and stable.
[0068] In another example, the valve core of the left one-way valve 4 faces the left rod 2, and the end of the left rod 2 facing the left one-way valve 4 has a left protrusion (not shown in the figure), which constitutes the left push member 11. The left protrusion and the left push member 11 are integrally formed, or the left protrusion is fixed to the end of the left push member 11 by bolts, welding, or bonding. Thus, when the pressurized oil enters the right chamber 1.2, as the cylinder 1 slides towards the left rod 2, the left rod 2 can push open the valve core of the left one-way valve 4 through the left push member 11, thereby opening the left one-way valve 4, balancing the pressure between the left chamber 1.1 and the right chamber 1.2 of the cylinder 1, and starting to release pressure, thereby reducing the operating speed of the cylinder 1 and achieving a buffering effect, which is good and stable.
[0069] Furthermore, the right pusher 12 is disposed on the valve core and / or the end of the right rod 3 of the right one-way valve 5, and can push open the valve core of the right one-way valve 5. Specifically,
[0070] In one example, such as Figure 2 As shown, the valve core of the right one-way valve 5 faces the right rod 3. The valve core of the right one-way valve 5 has a right protrusion that protrudes towards the right rod 3, extending to the outside of the right one-way valve 5. This right protrusion constitutes the right pusher 12. The right protrusion and the valve core of the right one-way valve 5 are integrally formed, or the right protrusion is fixed to the valve core of the right one-way valve 5 by bolts, welding, or bonding. Thus, when pressurized oil enters the left chamber 1.1, during the process of the cylinder 1 sliding towards the right rod 3, the right rod 3 can push open the valve core of the right one-way valve 5 through the right pusher 12, thereby opening the right one-way valve 5, balancing the pressure between the left chamber 1.1 and the right chamber 1.2 of the cylinder 1, and starting to release pressure, thereby reducing the running speed of the cylinder 1 and achieving a buffering effect. The buffering effect is good and stable.
[0071] In another example, the valve core of the right one-way valve 5 faces the right rod 3, and the end of the right rod 3 facing the right one-way valve 5 has a right protrusion (not shown in the figure), which constitutes the right push member 12. The right protrusion and the right push member 12 are integrally formed, or the right protrusion is fixed to the end of the right push member 12 by bolts, welding, or bonding. Thus, when pressurized oil enters the left chamber 1.1, as the cylinder 1 slides towards the right rod 3, the right rod 3 can push open the valve core of the right one-way valve 5 through the right push member 12, thereby opening the right one-way valve 5, balancing the pressure between the left chamber 1.1 and the right chamber 1.2 of the cylinder 1, and starting to release pressure, thereby reducing the operating speed of the cylinder 1 and achieving a buffering effect, which is good and stable.
[0072] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.
Claims
1. A pressure relief and buffering structure for a side shift cylinder, characterized by, include: The cylinder body has a partition in the middle that divides the inner cavity of the cylinder body into a left cavity and a right cavity, and the partition has a connecting hole that connects the left cavity and the right cavity. The left rod is slidably connected to the left end of the cylinder; the right rod is slidably connected to the right end of the cylinder. The left check valve is sealed to the left end of the connecting hole; the right check valve is sealed to the right end of the connecting hole. The left pusher is located on the valve core and / or the end of the left rod of the left check valve, and can push open the valve core of the left check valve. The right pusher is located on the valve core and / or the end of the right rod of the right check valve, and can push open the valve core of the right check valve.
2. The pressure relief buffer structure for a side-shifting hydraulic cylinder according to claim 1, characterized in that, When the pressurized oil enters the left chamber, the left check valve opens and the right check valve closes. The cylinder slides to the right rod side. During this process, the right rod can push open the valve core of the right check valve through the right pusher, so that the right check valve opens. When pressurized oil enters the right chamber, the right check valve opens and the left check valve closes. The cylinder slides to the left rod side. During this process, the left rod can push open the valve core of the left check valve through the left pusher, so that the left check valve opens.
3. The pressure relief buffer structure for a side-shifting hydraulic cylinder according to claim 1, characterized in that, The valve core of the left one-way valve faces the left rod body. The valve core of the left one-way valve has a left protrusion that protrudes towards the left rod body. The left protrusion extends to the outside of the left one-way valve and constitutes the left push member.
4. The pressure relief buffer structure for a side-shifting hydraulic cylinder according to claim 1, characterized in that, The valve core of the left one-way valve faces the left rod, and a left protrusion is provided on the end of the left rod facing the left one-way valve. This left protrusion constitutes the left push member.
5. The pressure relief buffer structure for a side-shifting hydraulic cylinder according to claim 1, characterized in that, The valve core of the right one-way valve faces the right rod body. The valve core of the right one-way valve has a right protrusion that protrudes towards the right rod body. The right protrusion extends to the outside of the right one-way valve and constitutes the right push member.
6. The pressure relief buffer structure for a side-shifting hydraulic cylinder according to claim 1, characterized in that, The valve core of the right one-way valve faces the right rod body, and a right protrusion is provided on the end of the right rod body facing the right one-way valve. This right protrusion constitutes the right push member.
7. A pressure relief buffer structure for a side-shifting hydraulic cylinder according to any one of claims 1-6, characterized in that, The cylinder body is provided with a left oil passage hole and a right oil passage hole. The left oil passage hole is connected to the left cavity, and the right oil passage hole is connected to the right cavity. The left rod and the right rod are coaxially distributed with the cylinder body.
8. A pressure relief buffer structure for a side-shifting hydraulic cylinder according to any one of claims 1-6, characterized in that, A sealing structure is provided between the left rod and the cylinder body. The sealing structure includes a dustproof ring, a shaft seal, and a support sleeve that are distributed sequentially along the cylinder body axis.
9. A pressure relief buffer structure for a side-shifting hydraulic cylinder according to any one of claims 1-6, characterized in that, The left one-way valve is connected to the left end of the connecting hole via a threaded seal.
10. A pressure relief buffer structure for a side-shifting hydraulic cylinder according to any one of claims 1-6, characterized in that, The right one-way valve is connected to the right end of the connecting hole via a threaded seal.