A high-wear-resistant guide structure for a hydraulic cylinder

Abstract

The utility model relates to the technical field of hydraulic cylinder, concretely relates to a kind of high wear-resistant guide structure for hydraulic cylinder, and hydraulic cylinder includes cylinder body and piston rod, and the outside of cylinder body is symmetrically equipped with two groups of independent external guide assembly, each group of external guide assembly includes fixed component fixedly connected to the outside of cylinder body, guide component is sleeved with piston rod and forms the guiding limit to it, and the connecting side plate vertically connected between fixed component and guide component, the length of connecting side plate in two groups of external guide assembly is different.Two groups of guide assembly that are misaligned in space are arranged, i.e. through the connecting side plate of different length, so that two second contact layers form support point not at the same height on the front and back of piston rod, the structure constitutes static indeterminate support system, can significantly enhance the resistance ability to piston rod lateral force and eccentric load torque, effectively suppresses the jitter and crawling phenomenon of piston rod in movement process.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic cylinders, and specifically to a highly wear-resistant guide structure for hydraulic cylinders. Background Technology

[0002] In hydraulic transmission systems, hydraulic cylinders are the core actuators for achieving linear motion. The reciprocating motion of the piston rod requires precise guidance to ensure its motion accuracy, withstand lateral forces, and prevent uneven wear of the seals.

[0003] In existing technologies, to address the problems of inconvenient replacement and inability to adjust internal guide sleeves in hydraulic cylinders, external guide structures exist. These structures typically provide auxiliary support for the piston rod by installing guide sleeves or guide rings on the outside of the cylinder body. However, existing external guide structures have the following problems:

[0004] First, most of them are simple ring sleeve structures, which can only provide single, coaxial support and cannot effectively resist the off-center load torque generated when the piston rod moves. Under complex working conditions, they are prone to piston rod vibration and accelerated wear.

[0005] Secondly, the guide clearance of existing structures is mostly fixed, and it cannot be fine-tuned according to the wear after installation. After initial wear, problems such as excessive clearance and failure of guide accuracy will occur. Moreover, replacement after wear often requires complete disassembly and reassembly, and the convenience of maintenance has not been fundamentally improved.

[0006] Finally, the lubrication design of existing structures is usually imperfect, relying heavily on initial grease or system oil splashing. Under harsh operating conditions, it is difficult to ensure continuous and effective lubrication of the friction pairs, which affects service life. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a high wear-resistant guide structure for hydraulic cylinders, which can solve the following problems:

[0008] Problems include poor resistance to eccentric loads, inability to compensate for gaps after wear, failure of guiding accuracy, and inconvenience in maintenance.

[0009] To solve the above-mentioned technical problems, the present invention proposes the following technical solution:

[0010] A high wear-resistant guide structure for a hydraulic cylinder, the hydraulic cylinder including a cylinder body and a piston rod, with two sets of independent external guide assemblies symmetrically mounted on the outer side of the cylinder body;

[0011] Each external guide assembly includes a fixed component fixedly connected to the outside of the cylinder body, a guide component sleeved with the piston rod and forming a guide limit thereon, and a connecting side plate vertically connected between the fixed component and the guide component.

[0012] The different lengths of the connecting side plates in the two sets of external guide assemblies cause the guide centers of the two sets of guide assemblies to be misaligned in the axial direction of the piston rod.

[0013] Furthermore, the fixing component includes a fixing seat, a first connecting layer and a first contact layer connected sequentially from the outside to the inside. The front and back of the fixing seat are provided with an outer fixing plate with threaded mounting holes. The contact surface between the fixing seat and the first connecting layer is provided with cross-mesh reinforcing ribs, and the interior of the outer fixing plate is provided with triangular reinforcing ribs.

[0014] Furthermore, the guide assembly includes a guide seat, a connecting seat, and a second contact layer connected sequentially from the outside to the inside; the guide seat is fixedly connected to the inner side of the top of the connecting side plate, and the connecting seat is a fan-shaped wedge block structure with a lateral adjusting screw for radial adjustment between it and the guide seat.

[0015] Furthermore, a slider is provided on the back of the second contact layer, and a T-slot matching the slider is provided on the inner end face of the connecting seat. The slider is fixed in the T-slot by a locking screw.

[0016] Furthermore, a grease injection nozzle is provided on the top surface of the connector, and a connecting lubrication channel is provided inside the connector and the second contact layer. A strip-shaped lubrication port is provided on the working surface of the second contact layer corresponding to the outlet of the lubrication channel.

[0017] Furthermore, the first connecting layer and the connecting seat are made of high-strength nylon, the first contact layer is made of modified polyoxymethylene, and the second contact layer is made of polytetrafluoroethylene composite material.

[0018] Furthermore, the connecting side plate is an arc-shaped plate with a longitudinally concave inner surface and welded with vertical reinforcing ribs.

[0019] As can be seen from the above technical solution, the beneficial effects of this utility model are:

[0020] 1. This utility model provides two sets of guide assemblies arranged vertically and vertically in space. Through connecting side plates of different lengths, the two second contact layers form support points at different heights on the front and back of the piston rod. This structure constitutes a statically indeterminate support system, which can significantly enhance the resistance to lateral forces and eccentric load moments of the piston rod, effectively suppress the shaking and crawling phenomena of the piston rod during movement, and greatly improve the guiding stability and the reliability of the hydraulic cylinder under complex stress conditions.

[0021] 2. In this utility model, the connecting seat adopts an adjustable wedge block structure and is connected to the guide seat through a lateral adjusting screw. This allows for precise radial movement and quantifiable fine-tuning of the guide clearance, as well as wear compensation. Users can precisely set and maintain the optimal fit clearance between the second contact layer and the piston rod by adjusting the screw. This not only ensures the initial guiding accuracy but also compensates for the increased clearance due to wear during use, greatly extending the service life.

[0022] 3. In this utility model, the second contact layer cooperates with the T-slot on the connecting seat through the slider on its back and is fixed by screw locking. When the second contact layer wears to the limit, the user does not need to disassemble the entire guide device or any hydraulic pipeline. He only needs to loosen the locking screw to slide out the old liner and replace it with a new one, which greatly reduces maintenance time and technical requirements, thereby achieving disassembly-free maintenance.

[0023] 4. This utility model integrates a grease injection nozzle and an internal lubrication channel on the connecting seat, and finally guides the grease to the friction interface through the strip-shaped lubrication port on the surface of the second contact layer. This can effectively ensure that the friction pair is fully lubricated under any working condition, effectively reduce the coefficient of friction and wear rate, and is especially suitable for harsh working conditions such as high temperature, heavy load, and low speed, ensuring the long-term durability of the guide structure. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 This is a front view of the overall structure of this utility model;

[0026] Figure 2 This is an exploded view showing the connection between the fixing component and the guide component in this utility model;

[0027] Figure 3 This is a schematic diagram of the connection of the guide component in this utility model.

[0028] Figure label:

[0029] 1. Cylinder body; 2. Piston rod; 3. Fixing assembly; 4. Guide assembly; 5. Outer fixing plate; 6. Fixing seat; 7. First connecting layer; 8. First contact layer; 9. Connecting side plate; 10. Guide seat; 11. Connecting seat; 12. Second contact layer. Detailed Implementation

[0030] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0031] See Figure 1-3 As shown, a high wear-resistant guide structure for a hydraulic cylinder includes a cylinder body 1 and a piston rod 2. A fixing component 3 is fixedly connected to the outside of the cylinder body 1. A guide component 4, which is sleeved with the piston rod 2, is provided above the fixing component 3. A connecting side plate 9 is vertically connected between the fixing component 3 and the guide component 4.

[0032] The fixing component 3 includes a fixing base 6, a first connecting layer 7 and a first contact layer 8 connected sequentially from the outside to the inside. The front and back surfaces of the fixing base 6 are both fixedly connected with an outer fixing plate 5 that is rectangularly protruding.

[0033] The guide assembly 4 includes a guide seat 10, a connecting seat 11, and a second contact layer 12 connected sequentially from the outside to the inside.

[0034] The fixing component 3, the connecting side plate 9 and the guide component 4 are matched and arranged in two sets at opposite positions on both sides of the cylinder body 1, and the connecting side plate 9 of one set is longer than the connecting side plate 9 of the other set.

[0035] In this embodiment of the utility model, the fixing seat 6 is generally arc-shaped and fits against the outer side of the cylinder body 1. Threaded mounting holes are opened on the surface of the outer fixing plate 5. The fixing seat 6 is provided with cross-shaped mesh reinforcing ribs on the contact surface of the first connecting layer 7, and triangular reinforcing ribs are provided inside the outer fixing plate 5. The first connecting layer 7 is arc-shaped and fits against the inner surface of the fixing seat 6. The first contact layer 8 is arc-shaped and fits against the inner surface of the first connecting layer 7. The connecting side plate 9 is arc-shaped and has a longitudinal arc-shaped concave inner surface. Vertical reinforcing ribs are welded vertically to the inner surface. The inner surfaces of the fixing seat 6, the first connecting layer 7, the first contact layer 8, the guide seat 10, and the second contact layer 12 are all transversely arc-shaped concave.

[0036] The guide seat 10 is an arc-shaped seat that fits against the inner top of the connecting side plate 9. The connecting seat 11 is a fan-shaped seat. The second contact layer 12 is fixedly connected to one side of the inner end of the connecting seat 11. The second contact layer 12 is an arc-shaped layer that fits against the surface of the piston rod 2. The connecting seat 11 and the second contact layer 12 in the two sets of guide components 4 are distributed in a front-to-back manner. The connecting seat 11 is set as an adjustable wedge block. A lateral adjustment screw is provided between it and the arc-shaped groove on the inner side of the guide seat 10 to achieve the effect of precisely adjusting the gap between the second contact layer 12 and the piston rod 2. The second contact layer is connected to the connecting seat 11 by a T-slot. The surface of the second contact layer 12 is provided with a matching slider. The slider and the groove are locked together by screws. A set of grease injection nozzles is opened on the top surface of the connecting seat 11. The connecting seat 11 and the second contact layer 12 are provided with lubrication channels of the same specifications. The surface of the second contact layer 12 is provided with a strip-shaped lubrication port.

[0037] The first connecting layer 7 and the connecting seat 11 are made of high-strength nylon, the first contact layer 8 is made of modified polyoxymethylene, and the second contact layer 12 is made of polytetrafluoroethylene composite material.

[0038] When using this device, firstly, the fixing seats 6 in the two sets of fixing components 3 are positioned at the same horizontal height on both sides of the surface of the cylinder body 1, so that the corresponding two sets of first contact layers 8 are attached to the surface of the cylinder body 1 to form contact. Then, the two sets of relatively distributed fixing components 3 are fixed by passing external studs through the outer fixing plate 5.

[0039] At this time, the two sets of connecting side plates 9 are vertically positioned on both sides of the cylinder 1 and the piston rod 2, forming a limit on the piston rod 2. The second contact layer 12 in the guide assembly 4 forms a limit sleeve on the piston rod 2 from the outside position. The two sets of connecting side plates 9 corresponding to the two sets of second contact layers 12 have different heights. Since the two sets of second contact layers 12 are distributed in a front-to-back relative manner, the two sets of second contact layers 12 are staggered vertically to form a guide limit on the front and back of the piston rod 2.

[0040] When the piston rod 2 is raised and lowered, the two sets of second contact layers 12 that come into contact with it can effectively guide and support it. When using this device, the user can make fine adjustments to the position of the whole device on the cylinder 1 according to the stroke of the piston rod 2.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A high wear-resistant guide structure for a hydraulic cylinder, the hydraulic cylinder comprising a cylinder body (1) and a piston rod (2), characterized in that: Two independent external guide assemblies are symmetrically installed on the outer side of the cylinder (1); Each external guide assembly includes a fixing component (3) fixedly connected to the outside of the cylinder body (1), a guide component (4) sleeved with the piston rod (2) and forming a guide limit thereto, and a connecting side plate (9) vertically connected between the fixing component (3) and the guide component (4). The connecting side plates (9) in the two sets of external guide assemblies have different lengths, and the height of the connecting side plate (9) in one set of external guide assemblies is greater than the height of the connecting side plate (9) in the other set of external guide assemblies.

2. The high wear-resistant guide structure for hydraulic cylinders according to claim 1, characterized in that: The fixing component (3) includes a fixing seat (6), a first connecting layer (7) and a first contact layer (8) connected sequentially from the outside to the inside; the front and back of the fixing seat (6) are provided with an outer fixing plate (5) with threaded mounting holes, the contact surface between the fixing seat (6) and the first connecting layer (7) is provided with cross mesh reinforcing ribs, and the interior of the outer fixing plate (5) is provided with triangular reinforcing ribs.

3. The high wear-resistant guide structure for hydraulic cylinders according to claim 2, characterized in that: The guide assembly (4) includes a guide seat (10), a connecting seat (11), and a second contact layer (12) connected sequentially from the outside to the inside; the guide seat (10) is fixedly connected to the inner side of the top of the connecting side plate (9); the connecting seat (11) is a fan-shaped wedge block structure, and a lateral adjustment screw for radial adjustment is provided between it and the guide seat (10).

4. A high wear-resistant guide structure for hydraulic cylinders according to claim 3, characterized in that: The back of the second contact layer (12) is provided with a slider, and the inner end face of the connecting seat (11) is provided with a T-shaped groove that matches the slider. The slider is fixed in the T-shaped groove by a locking screw.

5. A high wear-resistant guide structure for hydraulic cylinders according to claim 3, characterized in that: The top surface of the connecting seat (11) is provided with a grease injection nozzle, and a connecting lubrication channel is provided inside the connecting seat (11) and the second contact layer (12). A strip-shaped lubrication port is provided on the working surface of the second contact layer (12) corresponding to the outlet of the lubrication channel.

6. A high wear-resistant guide structure for hydraulic cylinders according to claim 3, characterized in that: The first connecting layer (7) and the connecting seat (11) are made of high-strength nylon, the first contact layer (8) is made of modified polyoxymethylene, and the second contact layer (12) is made of polytetrafluoroethylene composite material.

7. A high wear-resistant guide structure for hydraulic cylinders according to claim 1, characterized in that: The connecting side plate (9) is an arc-shaped plate with a longitudinally concave inner surface and welded with vertical reinforcing ribs.

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