Oil cylinder with sealing wake-up function, servo loading system and engineering machinery

Abstract

The utility model discloses an oil cylinder with a sealing wakeup function, a servo loading system and engineering machinery, which comprise a cylinder body, a piston rod and a piston arranged on the piston rod, an end cover is arranged at the opening end of the cylinder body, the piston rod penetrates through the end cover and extends into the cylinder body, an inner cavity of the cylinder body is divided into a first cavity and a second cavity through the piston, and the first cavity and the second cavity are communicated with each other. A functional oil port is formed in the end cover, a two-way low-friction sealing ring and a pneumatic sealing ring are arranged between the end cover and the piston rod, and the pneumatic sealing ring and the two-way low-friction sealing ring are arranged on the two sides of the functional oil port respectively so as to limit leakage of oil in the cylinder body. When the oil cylinder actuates, the high-frequency actuation of the oil cylinder can be realized through the pressure relief of the functional oil port and the sealing of the bidirectional low-friction ring; the pneumatic sealing ring is awakened through pressurization of the functional oil port, and long-time load maintaining and no leakage of the oil cylinder under side load are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to an oil cylinder with a seal wake-up function. In addition, it also relates to a servo loading system and construction machinery. Background Art

[0002] When the oil cylinder is suddenly reversed during long-term static loading under the action of lateral load, the sealing ring may not have time to rebound and cannot follow the piston rod in time, that is, the so-called "dormancy" phenomenon of the sealing element. At this time, short-term leakage may occur, and the sealing performance will be restored after several reciprocating operations under pressure.

[0003] When using a U-shaped ring or a Y-shaped ring as the main seal in the oil cylinder, due to the large cross-section and large compression amount of the sealing ring, the external leakage is small, but the large cross-section and large compression amount also bring large friction, which is not suitable for oil cylinders with high-frequency response requirements. However, if a low-friction sealing ring is used, although its friction is low, the compression amount is small, and when the oil cylinder is suddenly reversed during long-term static loading under the action of lateral load, the above-mentioned "dormancy" phenomenon will occur to the sealing ring.

[0004] In view of this, it is necessary to design an oil cylinder with a seal wake-up function, which can meet the high-frequency response, and at the same time meet the requirements of having lateral load, being able to be loaded for a long time and having no external leakage of oil. Content of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0006] Therefore, the utility model provides an oil cylinder with a seal wake-up function, which can meet the high-frequency response actuation of the oil cylinder and has no external leakage of oil.

[0007] An oil cylinder with a seal wake-up function provided by the first aspect of the utility model includes a cylinder body, a piston rod and a piston arranged on the piston rod. An end cover is provided at the open end of the cylinder body. The piston rod is adapted to penetrate through the end cover and extend into the cylinder body to divide the internal cavity of the cylinder body into a first cavity and a second cavity via the piston. A functional oil port is opened on the end cover. A two-way low-friction sealing ring and a pneumatic sealing ring are arranged between the end cover and the piston rod. The pneumatic sealing ring is arranged on the side of the functional oil port far from the piston, and the two-way low-friction sealing ring is arranged on the other side of the functional oil port to limit the external leakage of the oil in the cylinder body.

[0008] Preferably, a first oil port and a second oil port are further opened on the cylinder body. The first oil port is communicated with the first cavity, and the second oil port is connected with the second cavity, so as to be able to pressurize or relieve pressure on the corresponding first cavity and second cavity respectively via the first oil port and the second oil port.

[0009] Further preferably, the piston rod is adapted to bend after being subjected to a lateral load, and the bent piston rod is adapted to press the bi-directional low-friction sealing ring on one side of the bending direction, and increase the gap between the bi-directional low-friction sealing ring on the opposite side and the piston rod. And when the piston rod recovers, the gap between the bi-directional low-friction sealing ring on the pressed side and the piston rod increases.

[0010] Preferably, the functional oil port has a pressurized state and a pressure relief state. And when the first oil port relieves pressure on the first cavity and the second oil port pressurizes the second cavity, the functional oil port is adapted to switch to the pressurized state, so that after the pneumatic sealing ring rebounds to refill the increased gap between it and the piston rod, the functional oil port then switches to the pressure relief state.

[0011] Further preferably, the bi-directional low-friction sealing ring is arranged between the second cavity and the functional oil port to limit the oil fluid communication between the second cavity and the functional oil port.

[0012] Preferably, the end cover is connected to the cylinder block via a fixed connecting member, and a sealing member is provided between the part of the end cover embedded in the cylinder block and the inner wall of the cylinder block. The sealing member is adapted to limit the oil fluid in the second cavity from flowing out along the gap between the end cover and the inner wall of the cylinder block.

[0013] Further preferably, a dust-proof ring is further provided between the end cover and the piston rod. The dust-proof ring and the pneumatic sealing ring are arranged on the same side, and the dust-proof ring is arranged away from the functional oil port to be able to scrape off the dirt attached to the piston rod during the reciprocating movement of the piston rod.

[0014] Preferably, the functional oil port is adapted to be connected to an oil return tank to recover the oil fluid leaked from the second cavity.

[0015] The beneficial effect of the present utility model is that when the oil cylinder is actuated, pressure can be relieved through the functional oil port, and sealing can be carried out through the bi-directional low-friction sealing ring, while withstanding the high pressure in the cavity during the actuation of the oil cylinder. And because the friction coefficient of the bi-directional low-friction sealing ring is very low, its frictional force has almost no influence on the response of the oil cylinder, and the pneumatic sealing ring can block the oil fluid that the bi-directional low-friction sealing ring fails to block. At this time, the oil pressure received by the pneumatic sealing ring is zero and its frictional force is small. Therefore, this oil cylinder can meet the requirements of high-frequency response actuation and there is no oil fluid leakage.

[0016] In the second aspect of the present utility model, a servo loading system is provided, which adopts the oil cylinder with a sealing wake-up function described in the first aspect of the present utility model.

[0017] In the third aspect of the present utility model, a construction machinery is provided, which adopts the servo loading system described in the second aspect of the present utility model.

[0018] Other features and advantages of the present utility model will be described in the subsequent specification, and partly will become apparent from the specification or can be understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the specification, claims and drawings.

[0019] In order to make the above objectives, features and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments and in conjunction with the attached drawings, the detailed description is as follows. Description of the Drawings

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 It is a schematic internal structure diagram of an oil cylinder with a sealed wake-up function of the present utility model.

[0022] Description of the Reference Numerals in the Drawings:

[0023] 1. Cylinder block; 11. First cavity; 12. Second cavity; 13. First oil port; 14. Second oil port; 2. Piston rod; 3. Piston; 4. End cover; 5. Bidirectional low-friction sealing ring; 6. Pneumatic sealing ring; 7. Functional oil port; 8. Sealing element; 9. Dust-proof ring. Detailed Embodiments

[0024] Now, the present utility model will be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model. In the description of the present utility model, it should be understood that unless otherwise specified, the meaning of "a plurality of" is two or more, "bottom" refers to the lower part of the structure shown in the drawings, and "top" refers to the upper part of the structure shown in the drawings.

[0025] When the oil cylinder suddenly changes direction during long-term static loading under lateral load, the sealing ring may not have time to rebound and cannot follow the piston rod 2 in time, that is, the so-called "dormancy" phenomenon of the sealing element. At this time, short-term leakage may occur, and the sealing performance will recover after the piston rod 2 reciprocates under pressure several times. The "awakening" phenomenon of the sealing element is to make the sealing element recover the sealing performance as soon as possible.

[0026] See Figure 1, a cylinder with a sealed wake-up function in a specific embodiment of the present utility model, includes a cylinder block 1, a piston rod 2, and a piston 3. An end cover 4 is provided at the open end of the cylinder block 1. The piston rod 2 is adapted to penetrate through the end cover 4 and extend into the cylinder block 1. The piston 3 is disposed at one end of the piston rod 2 extending into the cylinder block 1, and the piston 3 can divide the internal cavity of the cylinder block 1 into a first cavity 11 and a second cavity 12. Moreover, a functional oil port 7 is also formed on the end cover 4. A bi-directional low-friction seal ring 5 and a pneumatic seal ring 6 are provided between the end cover 4 and the piston rod 2, and the bi-directional low-friction seal ring 5 and the pneumatic seal ring 6 are respectively disposed on both sides of the functional oil port 7. Among them, the bi-directional low-friction seal ring 5 is disposed on the side close to the second cavity 12, and the pneumatic seal ring 6 is disposed on the opposite side, so as to prevent the oil in the cylinder block 1 from leaking when the cylinder makes high-frequency response actuation.

[0027] Specifically, a first oil port 13 and a second oil port 14 are also formed on the cylinder block 1. The first oil port 13 is communicated with the first cavity 11, and the second oil port 14 is communicated with the second cavity 12. Pressurization or pressure relief can be carried out in the first cavity 11 through the first oil port 13, and pressurization or pressure relief can also be carried out in the second cavity 12 through the second oil port 14. Similarly, the functional oil port 7 formed on the end cover 4 also has the functions of pressurization and pressure relief.

[0028] More specifically, when the cylinder is under static loading, pressurization is carried out in the first cavity 11 through the first oil port 13, there is no oil pressure in the second cavity 12, and the functional oil port 7 is pressure-relieved. At this time, if the piston rod 2 bends after being subjected to a lateral load, the bent piston rod 2 will press the bi-directional low-friction seal ring 5 and the pneumatic seal ring 6 on the side of the bending direction, so that the radial forces received by the bi-directional low-friction seal ring 5 and the pneumatic seal ring 6 are uneven, and the pressure received by the bi-directional low-friction seal ring 5 and the pneumatic seal ring 6 on the opposite side is reduced and released. Moreover, since the compression amount of the bi-directional low-friction seal ring 5 itself is very small, the compression amounts of the bi-directional low-friction seal ring 5 and the pneumatic seal ring 6 will be insufficient.

[0029] At this time, if the first cavity 11 is depressurized through the first oil port 13 and the second cavity 12 is pressurized through the second oil port 14, the lateral load on the piston rod 2 will suddenly disappear, and the deflection of the piston rod 2 will also disappear. Moreover, since the elastomer in the bi-directional low-friction seal ring 5 cannot rebound in time, the gap between it and the piston rod 2 will increase, resulting in the oil in the cylinder block 1 being likely to flow out from the increased gap, leading to oil leakage. Therefore, when pressurizing the second cavity 12 through the second oil port 14, it is first necessary to switch the functional oil port 7 to the pressurized state and pressurize through the functional oil port 7 first, so that the elastomer in the pneumatic seal ring 6 rebounds and refills the gap generated with the piston rod 2. Then, switch the functional oil port 7 to the depressurized state. At this time, the pneumatic seal ring 6 loses the pressure generated by the functional oil port 7. Due to the structural characteristics of the pneumatic seal ring 6, even if the deflection of the piston rod 2 is eliminated, it can quickly rebound to limit the oil from leaking axially along the piston rod 2.

[0030] In addition, due to the setting of the bi-directional low-friction seal ring 5, this bi-directional low-friction seal ring 5 is a specially designed sealing element, aiming to achieve efficient and reliable sealing performance while reducing the friction between moving parts, thereby extending the service life of the equipment and improving efficiency. This kind of seal ring is usually applied to occasions that require bi-directional sealing, such as reciprocating motion or rotating motion devices. And the bi-directional low-friction seal ring 5 can effectively prevent the leakage of the medium in two directions. In this embodiment, it can effectively limit the intercommunication of oil between the oil in the second cavity 12 and the functional oil port 7 to achieve bi-directional sealing. Even when the functional oil port 7 is pressurized, the oil will not flow into the second cavity 12 through the bi-directional low-friction seal ring 5. Therefore, even when the piston rod 2 suddenly changes direction under the action of the lateral load during long-term static loading, there is still no oil leakage.

[0031] See Figure 1 , the end cover 4 is connected to the cylinder block 1 via a fixing member, and a part of the end cover 4 is embedded in the cylinder block 1. A sealing member 8 is provided between the part of the end cover 4 embedded in the cylinder block 1 and the inner wall of the cylinder block 1. Through this sealing member 8, the oil in the second cavity 12 can be restricted from flowing out along the gap between the end cover 4 and the inner wall of the cylinder block 1, so as to ensure the sealing performance after the end cover 4 and the cylinder block 1 are installed.

[0032] Specifically, a dust-proof ring 9 is further provided between the end cover 4 and the piston rod 2. The dust-proof ring 9 and the pneumatic seal ring 6 are on the same side of the functional oil port 7, and the dust-proof ring 9 is farther from the functional oil port 7 than the pneumatic seal ring 6, so as to scrape off the dirt attached to the piston rod 2 during the reciprocating movement of the piston rod 2.

[0033] In addition, the hydraulic oil accumulated between the pneumatic sealing ring 6 and the functional oil port 7 is restricted by the pneumatic sealing ring 6. Therefore, the functional oil port 7 can be connected to the oil return tank, and the oil return tank can receive the oil leaked from the second cavity 12 and blocked by the pneumatic sealing ring 6, so as to avoid the situation that the accumulated oil generates a large pressure on the pneumatic sealing ring 6 after long-term accumulation between the pneumatic sealing ring 6 and the second cavity 12, resulting in damage to the pneumatic sealing ring 6.

[0034] A servo loading system according to a specific embodiment of the present invention adopts the cylinder with a seal wake-up function described in any of the above embodiments. Since the servo loading system requires the cylinder to have a fast response and be able to maintain the load for a long time under the action of lateral loads, the cylinder with a seal wake-up function can well meet the above conditions.

[0035] A construction machinery according to a specific embodiment of the present invention adopts the cylinder with a seal wake-up function described in any of the above embodiments. The construction machinery mainly includes equipment such as presses and high machines. Among them, the requirements of the press are similar to those of the servo loading system, which requires accurate pressure output and the smaller the influence of the cylinder friction force, the better. The high machine mainly refers to engineering vehicles. Due to the requirements of weight reduction and high-altitude operation, many of its structures adopt cantilever structures, and the cylinders used are thin and long and need to maintain pressure for a long time. Therefore, the deflection of the piston rod 2 of the cylinder is very large and it is very easy to leak oil. The use of the above-mentioned hydraulic cylinder with a seal wake-up function can well meet the requirements of the above operating environment.

[0036] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] Based on the ideal embodiments of the present invention as described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined by the scope of the claims.

Claims

1. An oil cylinder with a sealed wake-up function, characterized in that, It includes a cylinder block (1), a piston rod (2), and a piston (3) arranged on the piston rod (2). An end cover (4) is provided at the open end of the cylinder block (1). The piston rod (2) is adapted to penetrate through the end cover (4) and extend into the cylinder block (1) to divide the internal cavity of the cylinder block (1) into a first cavity (11) and a second cavity (12) via the piston (3). A functional oil port (7) is formed on the end cover (4). A bi-directional low-friction seal ring (5) and a pneumatic seal ring (6) are provided between the end cover (4) and the piston rod (2). The pneumatic seal ring (6) is arranged on the side of the functional oil port (7) away from the piston (3), and the bi-directional low-friction seal ring (5) is arranged on the other side of the functional oil port (7) to restrict the leakage of the oil fluid in the cylinder block (1).

2. The oil cylinder with a sealed wake-up function according to claim 1, characterized in that, A first oil port (13) and a second oil port (14) are further formed on the cylinder block (1). The first oil port (13) is communicated with the first cavity (11), and the second oil port (14) is communicated with the second cavity (12) so as to be able to pressurize or relieve pressure in the corresponding first cavity (11) and second cavity (12) via the first oil port (13) and the second oil port (14) respectively.

3. The oil cylinder with a sealed wake-up function according to claim 2, characterized in that, The piston rod (2) is adapted to bend after being subjected to a lateral load. The bent piston rod (2) is adapted to press the bi-directional low-friction seal ring (5) on the side of the bending direction and increase the gap between the bi-directional low-friction seal ring (5) on the opposite side and the piston rod (2). When the piston rod (2) recovers, the gap between the bi-directional low-friction seal ring (5) on the pressed side and the piston rod (2) increases.

4. The oil cylinder with a sealed wake-up function according to claim 3, characterized in that, The functional oil port (7) has a pressurized state and a pressure-relieved state. When the first oil port (13) relieves pressure on the first cavity (11) and the second oil port (14) pressurizes the second cavity (12), the functional oil port (7) is adapted to switch to the pressurized state, and after the pneumatic seal ring (6) rebounds to refill the increased gap between it and the piston rod (2), the functional oil port (7) switches to the pressure-relieved state again.

5. The oil cylinder with a sealed wake-up function according to claim 1, characterized in that, The bi-directional low-friction seal ring (5) is arranged between the second cavity (12) and the functional oil port (7) to restrict the intercommunication of the oil fluid between the second cavity (12) and the functional oil port (7).

6. The oil cylinder with a sealed wake-up function according to claim 1, wherein, The end cover (4) is connected to the cylinder block (1) via a fixed connecting piece, and a sealing member (8) is provided between the part of the end cover (4) embedded in the cylinder block (1) and the inner wall of the cylinder block (1). The sealing member (8) is adapted to restrict the oil fluid in the second cavity (12) from flowing out along the gap between the end cover (4) and the inner wall of the cylinder block (1).

7. The oil cylinder with a sealed wake-up function according to claim 1, wherein A dust-proof ring (9) is further provided between the end cover (4) and the piston rod (2). The dust-proof ring (9) and the pneumatic seal ring (6) are arranged on the same side, and the dust-proof ring (9) is arranged away from the functional oil port (7).

8. The oil cylinder with a sealed wake-up function according to any one of claims 1 to 7, characterized in that The functional oil port (7) is adapted to be connected to an oil return tank to recover the oil leaked from the second cavity (12).

9. A servo loading system, characterized in that, It includes an oil cylinder with a seal wake-up function as described in any one of claims 1 to 8.

10. An engineering machinery, characterized in that, It includes a servo loading system as described in claim 9.

Images