Lifting oil cylinder

Abstract

The utility model discloses a lifting oil cylinder which comprises a piston rod located in a cylinder body and further comprises a cylinder bottom assembly connected to the right side of the cylinder body. The guide sleeve is arranged at one end of the cylinder body in a sleeving mode, and a dustproof ring and a first U-shaped sealing ring are arranged at the position where the guide sleeve and the piston rod are connected in a sliding and sleeving mode. A contact part is sealed through the first U-shaped sealing ring, the first U-shaped sealing ring and the O-shaped sealing ring are used in a combined mode, so that in the movement process of the oil cylinder, pressure borne by the first U-shaped sealing ring is buffered, the pressure is further transmitted to the O-shaped sealing ring, the O-shaped sealing ring converts the maximum pressure point to the edge of the sealing ring, and the sealing effect is improved. According to the oil cylinder, good buffering and sealing are achieved, the rising piston can be buffered, oil cylinder loss is reduced, the service life of the oil cylinder is prolonged, meanwhile, the second U-shaped sealing ring can buffer the return piston, and protection on the piston is further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a lifting oil cylinder. Background Art

[0002] The lifting cylinder is a device that uses the hydraulic principle to achieve lifting motion. It is widely used in cranes, lifting platforms, hydraulic lifts, car lifts and other equipment. The lifting cylinder consists of a cylinder barrel, a piston, a piston rod, a seal, an oil inlet and an oil return port.

[0003] The publication number is CN212106436U. A lifting oil cylinder for preventing oil leakage comprises a cylinder cover, a cylinder body, and a piston rod. The rod head of the piston rod is arranged on the left side of the cylinder body, and a cylinder cover is arranged at the left inner end of the cylinder body. The rod body of the piston rod is sequentially penetrated from the cylinder cover and the left end of the cylinder body into the cylinder body, and is connected to the piston. The cylinder cover and the rod head of the piston rod are provided with dust rings, and the cylinder cover and the rod body of the piston rod are sequentially provided with shaft seals, first shaft support rings, and second shaft support rings from left to right. By placing the small cavity vent hole on the piston rod, the vent hole is fixed, so that the oil pipe can be used to guide the hydraulic oil back to the oil tank, and the vent hole oil leakage phenomenon is eliminated; it has the advantages of simple structure, convenient maintenance, and low processing cost, but the piston of the existing lifting oil cylinders rises with the piston rod. When the piston rises to the top, it collides with the cylinder cover to generate a large impact force, which not only generates a certain amount of noise, but also causes serious cylinder loss, affecting the service life of the cylinder. Utility Model Content

[0004] The utility model aims to solve the shortcomings existing in the prior art, including a piston rod, the piston rod is located inside the cylinder body, and also includes: a cylinder bottom assembly, the cylinder bottom assembly is connected to the right side of the cylinder body; a guide sleeve, the guide sleeve is sleeved at one end of the cylinder body, and a dust ring and a first U-shaped sealing ring are provided at the sliding sleeve connection between the guide sleeve and the piston rod; a steel back bearing, the steel back bearing is arranged at the contact position between the piston rod and the cylinder body, and a bushing is arranged on the outside of the steel back bearing; an O-shaped sealing ring, the O-shaped sealing ring is connected between the guide sleeve and the bushing; a piston, the piston is arranged inside the cylinder body, and a support ring and a second U-shaped sealing ring are sleeved between the piston and the cylinder body; the cylinder bottom assembly includes a cylinder bottom and a buffer plunger, a clamping block is opened inside the cylinder bottom, and the buffer plunger is riveted to the cylinder bottom through a clamping groove.

[0005] As a further description of the above technical solution: a fixing plug is arranged on the outside of the guide sleeve.

[0006] As a further description of the above technical solution: an adjustment sleeve is coaxially assembled on the right side of the piston rod close to the piston.

[0007] As a further description of the above technical solution: a first wire retaining ring is arranged between the piston rod and the piston.

[0008] As a further description of the above technical solution: a second wire retaining ring is arranged between the piston and the cylinder bottom assembly, and a copper sleeve is arranged between the piston and the buffer plunger.

[0009] As a further description of the above technical solution: the first steel wire retaining ring and the second steel wire retaining ring are both made of carbon spring steel wire.

[0010] As a further description of the above technical solution: the dust ring, the first U-shaped sealing ring and the second U-shaped sealing ring are all made of polyurethane.

[0011] The above technical solution has the following advantages or beneficial effects:

[0012] The utility model seals at the contact part through the first U-shaped sealing ring, and uses the first U-shaped sealing ring and the O-shaped sealing ring in combination, so that during the movement of the oil cylinder, the pressure on the first U-shaped sealing ring is buffered, and the pressure is further transmitted to the O-shaped sealing ring, and the O-shaped sealing ring converts the maximum pressure point to the edge of the sealing ring, thereby achieving good buffering and sealing, so that the rising piston can be buffered, the cylinder loss is reduced, and the service life of the cylinder is extended. At the same time, the second U-shaped sealing ring can buffer the return piston, further enhancing the protection of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a lifting cylinder in one embodiment of the utility model;

[0014] Figure 2 for Figure 1 A partial enlarged view of the lifting cylinder at point A;

[0015] Figure 3 for Figure 1 A partial enlarged view of point B in the lifting cylinder;

[0016] Figure 4 for Figure 1 A partial enlarged view of point C in the lifting cylinder.

[0017] Legend:

[0018] 1. Dust ring; 2. First U-shaped sealing ring; 3. Steel back bearing; 4. O-shaped sealing ring; 5. Guide sleeve; 6. Cylinder bottom assembly; 7. Fixing plug; 8. Bushing; 9. Cylinder body; 10. Piston rod; 11. Adjusting sleeve; 12. Piston; 13. First steel wire retaining ring; 14. Support ring; 15. Copper sleeve; 16. Second steel wire retaining ring; 17. Second U-shaped sealing ring; 61. Cylinder bottom; 62. Buffer plunger; 63. Block; 64. Slot. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1-4 As shown, a lifting cylinder of the utility model includes a piston rod 10, which is located inside the cylinder body 9, and also includes: a cylinder bottom assembly 6, which is connected to the right side of the cylinder body 9; a guide sleeve 5, which is sleeved on one end of the cylinder body 9, and a dust ring 1 and a first U-shaped sealing ring 2 are provided at the sliding sleeve connection between the guide sleeve 5 and the piston rod 10; a steel back bearing 3, which is arranged at the contact position between the piston rod 10 and the cylinder body 9, and a bushing 8 is provided on the outside of the steel back bearing 3; an O-shaped sealing ring 4, which is connected between the guide sleeve 5 and the bushing 8; a piston 12, which is arranged inside the cylinder body 9, and a support ring 14 and a second U-shaped sealing ring 17 are sleeved between the piston 12 and the cylinder body 9; the cylinder bottom assembly 6 includes a cylinder bottom 61 and a buffer plunger 62, a clamping block 63 is opened inside the cylinder bottom 61, and the buffer plunger 62 is riveted to the cylinder bottom 61 through a clamping groove 64.

[0023] In this embodiment, a dust ring 1 and a first U-shaped sealing ring 2 are provided between the guide sleeve 5 and the cylinder body 9. The first U-shaped sealing ring 2 is used to seal the contact portion. By combining the first U-shaped sealing ring 2 and the O-shaped sealing ring 4, during the movement of the cylinder, the pressure on the first U-shaped sealing ring 2 is buffered, and the pressure is further transferred to the O-shaped sealing ring 4. The O-shaped sealing ring 4 converts the maximum pressure point to the edge of the sealing ring, thereby achieving good buffering and sealing; the rising piston 12 can be buffered, the cylinder loss can be reduced, and the service life of the cylinder can be extended. At the same time, the second U-shaped sealing ring 17 can buffer the return piston 12, further enhancing the protection of the piston 12.

[0024] Specifically, the buffer plunger 62 is riveted to the cylinder bottom 61 through the slot 64, and an interference fit and riveting deformation anti-loosening structure is adopted. During installation, the buffer plunger 62 is pressed into the cylinder bottom 61, and the friction between the buffer plunger 62 and the cylinder bottom 61 is used to hold the buffer plunger 62 tightly inside the cylinder bottom 61. At the same time, in order to prevent it from falling out, the block 63 is embedded in the slot 64, and the buffer plunger 62 is locked after riveting deformation, which can avoid the problem of easy falling out of the buffer plunger in the prior art. The buffer plunger is easy to install, has a simple structure, and has low manufacturing and use costs, which is easy to promote.

[0025] Among them, a steel back bearing 3 is provided at the connection between the piston rod 10 and the cylinder body 9; the steel back bearing 3 can reduce the friction between the piston rod 10 and the cylinder body 9, so that they can move relative to each other more smoothly and reduce energy loss. The steel back bearing 3 can absorb the impact and vibration generated by the movement of the piston 12, reduce the impact of these unstable factors on the system, and extend the service life of the equipment. By setting the dust ring 1, the problem of sealing failure caused by dust entering with the movement of the piston rod can be avoided.

[0026] like Figure 1 and Figure 2 As shown, specifically, a fixing plug 7 is provided on the outside of the guide sleeve 5, and the guide sleeve 5 is sleeved on the outside of the cylinder body 9; by sleeve-arranging the guide sleeve 5 on the outside of the cylinder body 9, it is easier to maintain and replace the guide sleeve 5, and the operator can more easily access the guide sleeve, making the maintenance work more convenient and efficient. At the same time, it can reduce the erosion and wear of the guide sleeve by hydraulic oil or other media, extend the service life of the guide sleeve, and facilitate the installation of the guide sleeve 5 through the fixing plug 7.

[0027] like Figure 1 and Figure 3As shown, specifically, an adjustment sleeve 11 is coaxially assembled on the right side of the piston rod 10 near the piston 12; the position of the piston rod 10 can be slightly adjusted through the adjustment sleeve 11, so as to ensure that the gap between the piston rod 10 and the piston 12 meets the design requirements, which helps to ensure the smooth movement of the piston and improve the sealing performance, thereby ensuring the normal operation of the hydraulic system or pneumatic system.

[0028] like Figure 1 and Figure 3 As shown, specifically, a first steel wire retaining ring 13 is provided between the piston rod 10 and the piston 12, and a second steel wire retaining ring 16 is provided between the piston 12 and the cylinder bottom assembly 6; the first steel wire retaining ring 13 and the second steel wire retaining ring 16 are used as sealing devices between the piston rod 10 and the piston 12 and between the piston 12 and the cylinder bottom assembly 6. The function of these steel wire retaining rings is to prevent the hydraulic oil or gas from leaking out from between the piston rod 10 and the piston 12 or between the piston 12 and the cylinder bottom assembly 6. The steel wire retaining rings are made of elastic material, which can ensure that when the piston moves, it is sealed between the piston rod 12 and the piston 10, or between the piston 12 and the cylinder bottom assembly 6 to prevent leakage of the pressure medium, which helps to ensure the stability and efficiency of the hydraulic system or the pneumatic system, and can reduce energy waste. By using the first steel wire retaining ring 13 and the second steel wire retaining ring 16, the sealing can be effectively maintained, the service life of the equipment can be extended, and the maintenance requirements can be reduced.

[0029] Among them, a copper sleeve 15 is arranged between the piston 12 and the buffer plunger 62; the copper sleeve 15 can reduce the friction between the piston and the buffer plunger, so that they can move relative to each other more smoothly and reduce energy loss. At the same time, the copper sleeve 15 can also play a certain guiding role, so that the piston and the buffer plunger maintain good axial positioning during relative movement, which is beneficial to the stable operation of the system.

[0030] like Figure 1 and Figure 3 As shown, specifically, the first steel wire retaining ring 13 and the second steel wire retaining ring 16 are both made of carbon spring steel wire; the first steel wire retaining ring 13 and the second steel wire retaining ring 16 made of carbon spring steel wire have high strength, can withstand large tensile force and compression force, and can provide good support and protection in components such as retaining rings.

[0031] like Figure 1 and Figure 2 As shown, specifically, the dust ring 1, the first U-shaped sealing ring 2 and the second U-shaped sealing ring 17 are all made of polyurethane; the dust ring 1, the first U-shaped sealing ring 2 and the second U-shaped sealing ring 17 made of polyurethane have good elasticity, can quickly return to their original state after being compressed, thereby ensuring the sealing effect, and have high wear resistance, and can resist mechanical friction and wear for a long time.

[0032] Working principle: a dust ring 1 and a first U-shaped sealing ring 2 are provided between the guide sleeve 5 and the cylinder body 9, and the first U-shaped sealing ring 2 is used to seal the contact part. The first U-shaped sealing ring 2 and the O-shaped sealing ring 4 are used in combination, so that during the movement of the cylinder, the pressure on the first U-shaped sealing ring 2 is buffered, and the pressure is further transferred to the O-shaped sealing ring 4, and the O-shaped sealing ring 4 transfers the maximum pressure point to the edge of the sealing ring, so as to achieve good buffering and sealing; so that the rising piston 12 can be buffered, the cylinder loss is reduced, and the service life of the cylinder is extended. At the same time, the second U-shaped sealing ring 17 can The return stroke of the piston 12 is buffered to further enhance the protection of the piston 12. The buffer plunger 62 is riveted to the cylinder bottom 61 through the slot 64, and an interference fit and riveting deformation anti-loosening structure is adopted. During installation, the buffer plunger 62 is pressed into the cylinder bottom 61, and the friction force between the buffer plunger 62 and the cylinder bottom 61 is used to hold the buffer plunger 62 tightly inside the cylinder bottom 61. At the same time, in order to prevent it from falling out, a clamping block 63 is embedded in the slot 64, and the buffer plunger 62 is locked after riveting deformation, which can avoid the problem of easy falling out of the buffer plunger in the prior art. The system is easy to install, has a simple structure, and has low manufacturing and use costs, so it is easy to promote.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A lifting cylinder, comprising a piston rod (10), wherein the piston rod (10) is located inside a cylinder body (9), characterized in that: Also includes: A cylinder bottom assembly (6), the cylinder bottom assembly (6) being connected to the right side of the cylinder body (9); A guide sleeve (5), wherein the guide sleeve (5) is sleeved on one end of the cylinder body (9), and a dust ring (1) and a first U-shaped sealing ring (2) are provided at the sliding sleeve joint between the guide sleeve (5) and the piston rod (10); A steel back bearing (3), wherein the steel back bearing (3) is arranged at a contact position between the piston rod (10) and the cylinder body (9), and a bushing (8) is arranged on the outside of the steel back bearing (3); An O-type sealing ring (4), wherein the O-type sealing ring (4) is connected between the guide sleeve (5) and the bushing (8); A piston (12), wherein the piston (12) is arranged inside the cylinder body (9), and a support ring (14) and a second U-shaped sealing ring (17) are sleeved between the piston (12) and the cylinder body (9); The cylinder bottom assembly (6) comprises a cylinder bottom (61) and a buffer plunger (62); a clamping block (63) is provided inside the cylinder bottom (61); and the buffer plunger (62) is riveted to the cylinder bottom (61) via a clamping groove (64).

2. A lifting cylinder according to claim 1, characterized in that: A fixing plug (7) is arranged on the outside of the guide sleeve (5).

3. A lifting cylinder according to claim 1, characterized in that: An adjustment sleeve (11) is coaxially mounted on the right side of the piston rod (10) near the piston (12).

4. A lifting cylinder according to claim 1, characterized in that: A first steel wire retaining ring (13) is arranged between the piston rod (10) and the piston (12).

5. The lifting cylinder according to claim 1, characterized in that: A second steel wire retaining ring (16) is provided between the piston (12) and the cylinder bottom assembly (6).

6. A lifting cylinder according to claim 1, characterized in that: A copper sleeve (15) is provided between the piston (12) and the buffer plunger (62).

7. A lifting cylinder according to claim 4, characterized in that: The first steel wire retaining ring (13) and the second steel wire retaining ring (16) are both made of carbon spring steel wire.

8. The lifting cylinder according to claim 1, characterized in that: The dustproof ring (1), the first U-shaped sealing ring (2) and the second U-shaped sealing ring (17) are all made of polyurethane.

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