A piston sealing structure of a hydraulic cylinder

Abstract

The utility model is applicable to the technical field of hydraulic cylinders and provides a piston sealing structure of a hydraulic cylinder, comprising a shell and a piston; a mounting groove and a piston rod arranged in the piston; a limiting body and a sealing body are arranged in an assembly chamber; the sealing body comprises a sealing protrusion arranged at the end position of the assembly chamber, a plurality of return springs arranged on the inner wall of the sealing protrusion, and a sealing ring and a rubber pad are arranged on the side of the plurality of return springs away from the sealing protrusion; the utility model ensures a tight fit between the hydraulic cylinder and the assembly chamber under high pressure and rapid movement by arranging the sealing body to cooperate with the limiting body, effectively preventing liquid leakage, while reducing friction and wear, and improving the durability of the sealing structure; the arrangement of the limiting body not only stabilizes the structure of the piston and the piston rod, but also effectively avoids the falling off of the piston rod and the collision of the piston with the end wall of the assembly chamber by limiting the maximum stroke of the piston, thereby significantly improving the stability and reliability of the hydraulic cylinder.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic cylinders, and in particular relates to a piston sealing structure of a hydraulic cylinder. Background Art

[0002] In the design of hydraulic cylinders, sealing and stability are two crucial aspects that directly affect the long-term and efficient operation of hydraulic cylinders. However, the existing sealing structure still faces some challenges in practical applications, which may affect the performance and life of hydraulic cylinders.

[0003] The utility model with Chinese patent application number CN202021976776.4 discloses a piston sealing structure for a hydraulic cylinder, including a cylinder barrel, a piston rod and a piston, wherein a piston rod is installed inside the cylinder barrel, and a piston is installed at the bottom end of the piston rod. The utility model can install the piston main seal inside the installation limit groove through the installation limit groove opened on the piston surface during the working process of the piston, and through the multiple positioning blocks that are equidistantly arranged on the upper and lower surfaces of the piston main seal, the connection and fitting area between the piston main seal and the piston can be effectively increased, which can not only effectively increase the sealing effect of the piston, but also effectively improve the accuracy and stability of the installation position of the piston main seal, and the Gley ring composed of the sealing assembly and the polytetrafluoroethylene ring can perform double-acting sealing on the piston, which not only has the characteristics of low friction, no creeping, small starting force, and high pressure resistance, but also effectively avoids the deformation and damage of the sealing structure caused by up and down movement.

[0004] The above comparative documents have the following problems:

[0005] Although the existing sealing structure provides a certain degree of stability, the reciprocating motion of the piston will cause unnecessary impact and vibration. This impact and vibration not only increases the friction and wear between the piston and the sealing structure, but may also cause deformation or damage to the sealing structure. The wear will not only lead to a decrease in sealing performance, but may also cause leakage and other problems. Utility Model Content

[0006] The utility model provides a piston sealing structure of a hydraulic cylinder, aiming to solve the problem that the existing sealing structure may cause unnecessary impact and vibration during the reciprocating motion of the piston. Such impact and vibration not only increase the friction and wear between the piston and the sealing structure, but may also cause deformation or damage to the sealing structure. The wear not only leads to a decrease in sealing performance, but also may cause leakage.

[0007] The utility model is implemented as follows: a piston sealing structure of a hydraulic cylinder comprises a shell, wherein an assembly cavity is provided in the shell; a piston is arranged at the end side of the assembly cavity; a mounting groove is provided in the piston; a piston rod is arranged in the mounting groove; a limiting body is provided at the lower position of the assembly cavity adjacent to the piston rod; a sealing body is provided at the side of the assembly cavity away from the piston; wherein the sealing body comprises: a sealing protrusion arranged at the end position of the assembly cavity, the sealing protrusion is arranged in an annular shape; a plurality of return springs are arranged on the inner wall of the sealing protrusion, and a damper is arranged in each of the plurality of return springs; two sealing rings are provided at the side of the plurality of return springs away from the sealing protrusion; and rubber pads are provided at the inner sides of the two sealing rings.

[0008] Preferably, the limiting body comprises: a plurality of rod-shaped limiting rods arranged on the inner wall of the assembly cavity, the plurality of limiting rods being evenly distributed along the circumference of the assembly cavity; and a limiting plate arranged on the other side of the limiting rods.

[0009] Preferably, a dust cover is provided at the position outside the housing where the piston rod extends, an inner wall of the dust cover is provided with an internal thread, an outer wall of the housing is provided with an external thread matching the internal thread, and the housing is threadedly matched with the dust cover.

[0010] Preferably, the winding ratio of the internal thread is consistent with the winding ratio of the external thread.

[0011] Preferably, the cross section of the limiting plate is in an arc shape that matches the outer wall of the piston rod.

[0012] Preferably, a shock-absorbing pad is provided on a side of the assembly cavity away from the sealing body.

[0013] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0014] First, the device has excellent sealing performance. Through the design of the annular sealing protrusion, the hydraulic cylinder achieves a close fit with the end of the assembly cavity, thereby forming a preliminary sealing effect. This design ensures that the liquid is difficult to leak from the gap between the assembly cavity and the piston under high pressure or rapid movement. The combination of the return spring and the damper further enhances the reliability of the sealing structure. In addition, the setting of the two sealing rings and the rubber pad further enhances the sealing effect, reduces friction and wear, and improves the durability of the sealing structure.

[0015] Second: by setting the limit body, the overall structure of the piston and piston rod is ensured to be stable and reliable, and the vibration and instability of the piston during reciprocating motion in the assembly chamber are reduced. When the piston reaches the maximum stroke, the limit plate will prevent the piston from moving forward, thereby limiting the maximum stroke of the piston. This can not only effectively prevent the piston rod from falling off, but also reduce the collision between the piston and the end wall of the assembly chamber, further improving the stability and reliability of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front structural schematic diagram of the utility model;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 3 It is a schematic diagram of the limiting main structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the sealing main body structure of the utility model;

[0020] In the figure: 1. housing; 2. piston; 3. mounting groove; 4. piston rod; 5. sealing protrusion; 6. return spring; 7. sealing ring; 8. rubber pad; 9. limit rod; 10. limit plate; 11. dust cover; 12. internal thread; 13. external thread; 14. shock-absorbing pad. DETAILED DESCRIPTION

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] The utility model embodiment provides a piston sealing structure of a hydraulic cylinder, such as Figure 1-4As shown, it includes a shell 1, in which an assembly cavity is opened; a piston 2 is arranged at the end side of the assembly cavity; a mounting groove 3 is arranged in the piston 2; a piston rod 4 is arranged in the mounting groove 3; a limiting body is arranged at the lower position of the assembly cavity adjacent to the piston rod 4; a sealing body is arranged on the side of the assembly cavity away from the piston 2; the sealing body includes a sealing protrusion 5 arranged at the end position of the assembly cavity, and the sealing protrusion 5 is arranged in an annular shape; a plurality of return springs 6 are arranged on the inner wall of the sealing protrusion 5, and dampers are arranged in the plurality of return springs 6; two sealing rings 7 are arranged on the side of the plurality of return springs 6 away from the sealing protrusion 5; and rubber pads 8 are arranged on the inner sides of the two sealing rings 7.

[0024] It should be noted that, since the existing sealing structure will cause unnecessary impact and vibration during the reciprocating motion of the piston 2, such impact and vibration will not only increase the friction and wear between the piston 2 and the sealing structure, but may also cause deformation or damage to the sealing structure. The wear will not only lead to a decrease in the sealing performance, but may also cause leakage problems. The present solution can fit tightly against the end of the assembly cavity through the design of the annular sealing protrusion 5 to form a preliminary sealing effect. The combination of the return spring 6 and the damper further enhances this sealing effect, provides the necessary elasticity and damping, and ensures that the piston 2 always fits tightly against the end of the assembly cavity when moving, while reducing impact and vibration; in addition, the piston rod 4 is stably connected to the piston 2 through the mounting groove 3, ensuring that the overall structure of the piston 2 and the piston rod 4 is stable and reliable. The design of the limit plate 10 further improves the stability of the hydraulic cylinder, and by limiting the maximum stroke of the piston 2, the piston 2 rod is prevented from falling off, and the collision between the piston 2 and the end wall of the assembly cavity is reduced.

[0025] Specifically, in this embodiment, the scheme mainly includes a shell 1, in which an assembly cavity is opened; a piston 2 is arranged at the end side of the assembly cavity; a mounting groove 3 and a piston rod 4 are arranged in the piston 2; a limiting body is arranged at the lower position of the assembly cavity adjacent to the piston rod 4; a sealing body is arranged on the side of the assembly cavity away from the piston 2; the sealing protrusion 5 is designed to be annular in structure to ensure that it can fit tightly with the end of the assembly cavity. This tight fit forms a preliminary sealing effect, which effectively prevents liquid from leaking from the gap between the assembly cavity and the piston 2. The combination of the return spring 6 and the damper is a sealing structure. The structure provides elasticity and damping effects, the return spring 6 can provide appropriate reaction force when the piston 2 moves, ensuring that the sealing protrusion 5 is always tightly fitted to the end of the assembly cavity, and the damper can reduce the impact and vibration when the piston 2 moves, further improving the reliability of the seal. On the other side of the return spring 6, two sealing rings 7 are provided, which work together with the sealing protrusion 5 to enhance the sealing effect; in addition, a rubber pad 8 is also provided on the inner side of the two sealing rings 7. The rubber pad 8 has good elasticity and wear resistance, which can further improve the sealing effect and reduce the friction and wear when the piston 2 moves;

[0026] The piston rod 4 is connected to the piston 2 through the mounting groove 3, which provides certain support and stability to ensure that the overall structure of the piston 2 and the piston rod 4 is stable and reliable; the limit body is arranged at the lower position of the assembly cavity, and its main function is to limit the maximum stroke of the piston 2 and prevent the piston rod 4 from falling off. The limit body is made of strong and durable material and can withstand the impact and vibration during the movement of the piston 2. By limiting the maximum stroke of the piston 2, the limit body ensures the stability and safety of the hydraulic cylinder.

[0027] In a further preferred embodiment of the present invention, Figure 1-3 As shown, the limiting body includes: a plurality of rod-shaped limiting rods 9 arranged on the inner wall of the assembly cavity, and the plurality of limiting rods 9 are evenly distributed along the circumference of the assembly cavity; and a limiting plate 10 arranged on the other side of the limiting rods 9 .

[0028] In this embodiment, the limit rod 9 provides uniform support and limiting effects. When the piston 2 reciprocates in the assembly chamber, the end face of the piston 2 will contact the limit plate 10. When the piston 2 reaches the maximum stroke, the limit plate 10 will prevent the piston 2 from continuing to move forward, thereby limiting the maximum stroke of the piston 2. It can effectively prevent the piston rod 4 from falling off, reduce the collision between the piston 2 and the end wall of the assembly chamber, and improve the stability and reliability of the hydraulic cylinder.

[0029] In a further preferred embodiment of the present invention, Figure 2As shown, the piston rod 4 is extended to the outer position of the housing 1 and is provided with a dust cover 11, the inner wall of the dust cover 11 is provided with an internal thread 12, the outer wall of the housing 1 is provided with an external thread 13 matching the internal thread 12, and the housing 1 is threadedly matched with the dust cover 11.

[0030] In this embodiment, the dust cover 11 can be tightly threadedly connected to the housing 1 by rotating it, thereby preventing external impurities and pollutants from entering the interior of the hydraulic cylinder.

[0031] In a further preferred embodiment of the present invention, Figure 2 As shown, the winding ratio of the internal thread 12 is consistent with the winding ratio of the external thread 13.

[0032] In this embodiment, when the housing 1 and the dust cover 11 are screwed together, the inclination angles of the threads are the same, thereby ensuring that the threads can be screwed in smoothly and tightly combined. This design helps to reduce the resistance during screwing and improve the reliability and sealing of the connection.

[0033] In a further preferred embodiment of the present invention, Figure 3 As shown, the cross section of the limit plate 10 is arranged in an arc shape that matches the outer wall of the piston rod 4 .

[0034] In this embodiment, the arc-shaped cross-section design can ensure a smooth transition when the piston rod 4 contacts the limit plate 10 , thereby reducing impact and friction, thereby extending the service life of the piston rod 4 and the limit plate 10 .

[0035] In a further preferred embodiment of the present invention, Figure 1 As shown, a shock-absorbing pad 14 is provided on the side of the assembly cavity away from the sealing body.

[0036] In this embodiment, when the hydraulic cylinder is subjected to external impact or internal pressure changes suddenly, the shock-absorbing pad 14 can absorb part of the impact energy, reduce the impact load on the piston 2 and the piston rod 4, effectively reduce the amplitude of these vibrations, and maintain the smooth operation of the piston 2 and the piston rod 4.

[0037] Working principle: The sealing protrusion 5 of the device is designed as an annular structure to ensure that it can fit tightly against the end of the assembly cavity. This tight fit forms a preliminary sealing effect and effectively prevents liquid from leaking from the gap between the assembly cavity and the piston 2. The combination of the return spring 6 and the damper provides elasticity and damping effects for the sealing structure. The return spring 6 can provide appropriate reaction force when the piston 2 moves to ensure that the sealing protrusion 5 always fits tightly against the end of the assembly cavity, while the damper can reduce the impact and vibration of the piston 2 during movement, further improving the reliability of the seal. On the other side of the return spring 6, two sealing rings 7 are provided, which work together with the sealing protrusion 5 to enhance the sealing effect; in addition, a rubber pad 8 is provided on the inner side of the two sealing rings 7. The rubber pad 8 has good elasticity and wear resistance, which can further improve the sealing effect and reduce the friction and wear of the piston 2 during movement.

[0038] The piston rod 4 is connected to the piston 2 through the mounting groove 3, which provides certain support and stability, ensuring that the overall structure of the piston 2 and the piston rod 4 is stable and reliable; the limiting body is arranged at the lower position of the assembly cavity, and when the piston 2 reciprocates in the assembly cavity, the end face of the piston 2 will contact the limiting plate 10. When the piston 2 reaches the maximum stroke, the limiting plate 10 will prevent the piston 2 from continuing to move forward, thereby limiting the maximum stroke of the piston 2, which can effectively prevent the piston rod 4 from falling off, reduce the collision between the piston 2 and the end wall of the assembly cavity, and improve the stability and reliability of the hydraulic cylinder.

[0039] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the utility model is not limited by the described action sequence, because according to the utility model, some steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the utility model.

[0040] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0041] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0042] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the utility model according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the utility model in essence, and these technical solutions also belong to the scope of protection of the utility model.

Claims

1. A piston sealing structure of a hydraulic cylinder, characterized in that: include: A housing, wherein an assembly cavity is provided in the housing; A piston disposed at an end side of the assembly chamber; a mounting groove disposed in the piston; a piston rod disposed in the mounting groove; The assembly cavity is provided with a limiting body at a lower position adjacent to the piston rod; A sealing body is provided on a side of the assembly cavity away from the piston; Wherein, the sealing body comprises: A sealing protrusion arranged at the end of the assembly cavity, wherein the sealing protrusion is arranged in an annular shape; A plurality of return springs are arranged on the inner wall of the sealing protrusion, and a damper is arranged in each of the return springs; Two sealing rings are arranged on one side of the return spring away from the sealing protrusion; A rubber pad is arranged on the inner side of the two sealing rings.

2. A piston sealing structure of a hydraulic cylinder according to claim 1, characterized in that: The limiting body comprises: A plurality of rod-shaped limiting rods are arranged on the inner wall of the assembly cavity, and the plurality of limiting rods are evenly distributed along the circumference of the assembly cavity; A limiting plate is arranged on the other side of the limiting rod.

3. The piston sealing structure of a hydraulic cylinder according to claim 1, characterized in that: The piston rod is extended to an outer position of the shell and is provided with a dust cover, the inner wall of the dust cover is provided with an internal thread, the outer wall of the shell is provided with an external thread matching the internal thread, and the shell is threadedly matched with the dust cover.

4. A piston sealing structure of a hydraulic cylinder as claimed in claim 3, characterized in that: The twist ratio of the internal thread is consistent with the twist ratio of the external thread.

5. The piston sealing structure of a hydraulic cylinder according to claim 2, characterized in that: The cross section of the limit plate is arranged in an arc shape which matches the outer wall of the piston rod.

6. A piston sealing structure of a hydraulic cylinder as claimed in claim 2, characterized in that: A shock-absorbing pad is arranged on one side of the assembly cavity away from the sealing body.

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