Piston assembly of wear-resistant hydraulic oil cylinder

Abstract

The utility model discloses a piston assembly of a wear-resisting hydraulic oil cylinder, which relates to the technical field of hydraulic oil cylinders and is characterized by comprising a piston rod, the piston rod comprises an inner ring reinforcing layer, a filling layer, an outer ring reinforcing layer and a reinforcing frame penetrating through and integrated with the inner ring reinforcing layer, the filling layer and the outer ring reinforcing layer, and the inner ring reinforcing layer, the filling layer and the outer ring reinforcing layer are fixedly connected. A wear-resistant coating is arranged on the outer wall of the outer ring reinforcing layer; the wear resistance of the piston rod can be improved, and the service life of the whole equipment can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a piston assembly for a wear-resistant hydraulic cylinder. Background Technology

[0002] In the field of hydraulic cylinder technology, the piston assembly, as one of its core components, directly affects the working efficiency, stability, and service life of the entire hydraulic system. Hydraulic cylinders convert the pressure energy of liquid into mechanical energy through the reciprocating motion of the piston assembly within the cylinder body. During this process, the piston assembly not only must withstand the force of the high-pressure liquid but also maintain efficient and stable operation in a long-term, high-frequency friction environment. Therefore, the wear resistance of the piston assembly has become one of the key indicators for evaluating its quality.

[0003] The piston assembly of traditional hydraulic cylinders, especially the piston rod, is usually made of ordinary steel or alloy materials. Although it meets the basic strength requirements to a certain extent, its wear resistance often falls short when faced with complex and variable working conditions, such as heavy load, high speed, high frequency vibration, and harsh environments (such as high temperature and corrosion).

[0004] To address this technical challenge, existing technologies have attempted to improve the wear resistance of piston rods by modifying material composition, optimizing heat treatment processes, or applying surface coating technologies. For example, Chinese utility model patent CN202022434675.0, entitled "A High Wear-Resistant Piston Rod for Hydraulic Cylinders," proposes an effective solution that significantly improves the wear resistance of piston rods and extends their service life by using specific wear-resistant alloy materials and advanced surface treatment technologies.

[0005] However, with the continuous advancement of industrial technology and the increasing demands on the performance of hydraulic cylinders, exploring and developing more efficient, economical, and environmentally friendly wear-resistant piston assembly technologies remains an important research direction in this field. Against this backdrop, this invention aims to provide an innovative piston assembly design to improve wear resistance. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a piston assembly for a wear-resistant hydraulic cylinder, which improves the wear resistance of the piston rod and extends the overall service life of the equipment.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A piston assembly for a wear-resistant hydraulic cylinder includes a piston rod. The piston rod includes an inner ring reinforcing layer, a filler layer, an outer ring reinforcing layer, and a reinforcing frame that penetrates and integrates into the three layers. The inner ring reinforcing layer, the filler layer, and the outer ring reinforcing layer are fixedly connected. The outer wall of the outer ring reinforcing layer is provided with a wear-resistant coating to improve wear resistance.

[0009] Preferably, the reinforced frame includes an annular inner mesh and an outer mesh, which are fixedly connected by multiple reinforcing rods. The inner reinforcing layer is wrapped around the inner mesh, and the outer reinforcing layer is wrapped around the outer mesh. The reinforcing rods pass through and are fixedly connected to the filling layer to improve mechanical strength and thus ensure wear resistance.

[0010] Preferably, the inner reinforcing layer is made of 42CrMo alloy steel; the filling layer is made of 7075 aluminum alloy; the outer reinforcing layer is made of high carbon chromium steel; and the reinforcing frame is made of spring steel, which has good mechanical strength.

[0011] Preferably, the wear-resistant coating is made of tungsten carbide thermal spray coating, which has good wear resistance.

[0012] Preferably, the inner wall of the inner ring reinforcement layer is provided with multiple annularly distributed reinforcement ridges, and the direction of the reinforcement ridges is the same as the length direction of the piston rod, which improves mechanical strength and thus ensures wear resistance.

[0013] Preferably, a support rod is provided between two adjacent reinforcing ridges to further improve wear resistance.

[0014] Preferably, the reinforcing ridge and the support rod are both hollow to reduce weight.

[0015] Preferably, the reinforcing ridge and the support rod are made of aluminum alloy, which is lightweight and has high mechanical strength.

[0016] This utility model has the following beneficial effects:

[0017] Multi-layer structural design: The inner ring reinforcement layer uses 42CrMo alloy steel, a material with high strength and wear resistance, effectively resisting internal pressure and wear. The filler layer uses 7075 aluminum alloy; although aluminum alloy's wear resistance is not as good as alloy steel, its lightweight and good mechanical properties contribute to the overall structural stability and weight reduction. The outer ring reinforcement layer uses high-carbon chromium steel, a material with extremely high hardness and wear resistance, effectively protecting the piston rod from external wear. The annular inner and outer ring meshes are connected by reinforcing rods, forming a stable support structure. The reinforcing rods penetrate and are fixedly connected to the filler layer, enhancing the overall structural strength and stability. The reinforcement frame uses spring steel, which has good elasticity and fatigue resistance, maintaining structural integrity during long-term use. The outer wall of the outer ring reinforcement layer is coated with a tungsten carbide thermal spray coating; tungsten carbide is a material with extremely high hardness and excellent wear resistance, significantly improving the piston rod's wear resistance.

[0018] Improved support performance: The inner wall of the inner ring reinforcement layer features multiple evenly distributed annular reinforcing ridges. These ridges not only enhance the internal structure of the piston rod but also provide additional support and stability during piston movement. Support rods are positioned between adjacent reinforcing ridges, further enhancing the stability of the internal structure. Both the reinforcing ridges and support rods are hollow and made of aluminum alloy, reducing weight while maintaining sufficient strength.

[0019] Extended service life: Through the aforementioned multi-layered structural design and wear-resistant coating, the wear resistance of the piston rod is significantly improved, thereby reducing failures and maintenance needs caused by wear. The reinforced frame and reinforced ridges enhance the overall strength and stability of the piston rod, making it more capable of withstanding long-term high-load operation. Lightweight design (such as using aluminum alloy as the filler layer and support structure) helps reduce the overall weight of the equipment, lowers energy consumption, and may extend the service life of other related components. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of the first embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional view of the second embodiment of the present invention.

[0023] In the diagram: 100, piston rod; 101, inner ring reinforcement layer; 102, filling layer; 103, outer ring reinforcement layer; 104, reinforcement frame; 141, inner ring mesh; 142, outer ring mesh; 143, reinforcement rod; 105, wear-resistant coating; 106, reinforcement ridge; 107, support rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] First embodiment

[0026] A piston assembly for a wear-resistant hydraulic cylinder includes a piston rod 100. The piston rod 100 includes an inner ring reinforcing layer 101, a filler layer 102, an outer ring reinforcing layer 103, and a reinforcing frame 104 that penetrates and integrates the three. The inner ring reinforcing layer 101, the filler layer 102, and the outer ring reinforcing layer 103 are fixedly connected. The outer wall of the outer ring reinforcing layer 103 is provided with a wear-resistant coating 105.

[0027] This embodiment achieves comprehensive protection and reinforcement of the piston rod 100 through a multi-layered structural design, the introduction of a reinforcing frame 104, and the application of a wear-resistant coating 105. These design measures work together to significantly improve the wear resistance, structural strength, and stability of the piston rod 100, thereby extending the overall service life of the hydraulic cylinder. This design not only improves the reliability and economy of the equipment.

[0028] like Figure 1As shown, the reinforced frame 104 includes an annular inner mesh 141 and an outer mesh 142. The inner mesh 141 and the outer mesh 142 are fixedly connected by multiple reinforcing rods 143. The inner reinforcing layer 101 wraps around the inner mesh 141, and the outer reinforcing layer 103 wraps around the outer mesh 142. The reinforcing rods 143 penetrate and are fixedly connected to the filling layer 102. The inner mesh 141 and the outer mesh 142 serve as the foundation of the reinforced frame 104, providing an annular support structure. This annular design helps to evenly distribute the radial and axial loads on the piston rod 100, thereby enhancing its structural strength and stability. The reinforcing rods 143 play a crucial connecting role between the inner mesh 141 and the outer mesh 142. They not only enhance the connection strength between the inner mesh 141 and the outer mesh 142 but also form an integral frame structure, improving the bending and torsional resistance of the piston rod 100. The reinforcing rod 143 penetrates through and is fixedly connected to the filler layer 102. This design allows the reinforcing frame 104 to form a tight whole with the other parts of the piston rod 100 (inner ring reinforcing layer 101, filler layer 102, and outer ring reinforcing layer 103). This tight connection helps reduce relative movement between layers, thereby improving the overall rigidity and stability of the piston rod 100.

[0029] In this embodiment, the combination of the inner ring mesh 141, the outer ring mesh 142, and the reinforcing rod 143 forms an integral frame structure for the reinforcing frame 104. This structure can more effectively resist external loads and impacts, reducing the risk of deformation and damage to the piston rod 100. The design of the reinforcing frame 104 not only enhances the structural strength of the piston rod 100 but also improves its fatigue resistance. During long-term high-load operation, the reinforcing frame 104 can maintain its shape and performance stability, extending the service life of the piston rod 100. The annular design of the reinforcing frame 104 and the connecting effect of the reinforcing rod 143 help to evenly distribute the load on the piston rod 100 across the entire structure. This uniform load distribution can reduce local stress concentration and lower the risk of damage to the piston rod 100 due to excessive stress. Although the reinforcing frame 104 itself does not directly participate in the wear resistance process, it indirectly improves the wear resistance of the piston rod 100 by enhancing the overall structure and stability of the piston rod 100. A structurally stable and high-strength piston rod 100 is more resistant to external wear and erosion, thereby extending its service life.

[0030] The inner ring reinforcing layer 101 is made of 42CrMo alloy steel. 42CrMo alloy steel possesses excellent strength and toughness, capable of withstanding the high pressure and complex loads inside the piston rod 100. After heat treatment, its surface hardness is increased, effectively resisting wear. The filler layer 102 is made of 7075 aluminum alloy. 7075 aluminum alloy has low density and high strength, helping to reduce the overall weight of the piston rod 100. The outer ring reinforcing layer 103 is made of high-carbon chromium steel. After quenching and tempering, high-carbon chromium steel has extremely high surface hardness, effectively resisting external wear and impact. This material is particularly suitable for applications requiring high wear resistance. The reinforcing frame 104 is made of spring steel. Spring steel has good elastic recovery ability, maintaining shape stability under cyclic loads. The wear-resistant coating 105 is made of tungsten carbide thermal spray coating. Tungsten carbide is one of the hardest known metallic carbides, possessing extremely high wear resistance. Tungsten carbide thermal spray coating can effectively reduce friction and wear between piston rod 100 and external medium.

[0031] Suitable for protecting the outer ring reinforcement layer 103 from extreme wear conditions.

[0032] Second embodiment

[0033] like Figure 2 As shown, the inner wall of the inner reinforcing layer 101 is provided with multiple annularly distributed reinforcing ridges 106, and the orientation of these reinforcing ridges 106 is the same as the length direction of the piston rod 100. A support rod 107 is also provided between two adjacent reinforcing ridges 106. In addition, both the reinforcing ridges 106 and the support rods 107 are designed as hollow structures and are made of aluminum alloy.

[0034] like Figure 2 As shown, the reinforcement ridges 106 increase the thickness and stiffness of the inner ring reinforcement layer 101, thereby improving the overall structural strength of the piston rod 100. This reinforcement helps the piston rod 100 better withstand internal high pressure and complex loads, reducing the risk of deformation and damage. The annular, uniformly distributed design of the reinforcement ridges 106 helps to evenly distribute the stress on the piston rod 100 across the entire inner ring reinforcement layer 101. This uniform stress distribution reduces local stress concentration, lowering the risk of damage to the piston rod 100 due to excessive stress. Although the reinforcement ridges 106 themselves do not directly participate in the wear-resistant process, they indirectly improve the wear resistance of the piston rod 100 by enhancing the structural strength of the inner ring reinforcement layer 101. A structurally stable and high-strength piston rod 100 is more resistant to external wear and erosion.

[0035] like Figure 2As shown, support rods 107 are positioned between two adjacent reinforcing protrusions 106, serving both a connecting and supporting function. They enhance the connection stability between the reinforcing protrusions 106, resulting in a more robust overall structure for the inner reinforcing layer 101. The support rods 107 also help improve the bending resistance of the piston rod 100. Under bending loads, the support rods 107 can resist bending deformation, maintaining the shape stability of the piston rod 100.

[0036] like Figure 2 As shown, both the reinforcing ridge 106 and the support rod 107 are designed as hollow structures, which helps to reduce the overall weight of the piston rod 100. Reducing weight while maintaining sufficient strength improves the operating efficiency and energy efficiency of the equipment. Aluminum alloy has excellent thermal conductivity. The hollow structure design allows heat convection channels to be formed inside the reinforcing ridge 106 and the support rod 107, which helps dissipate heat and reduce the operating temperature of the piston rod 100. This helps to extend the service life of the piston rod 100 and improve the reliability of the equipment.

[0037] Aluminum alloys have low density and high strength, which allows the reinforcing ridge 106 and support rod 107 to maintain sufficient strength while reducing the weight of the piston rod 100. Aluminum alloys also offer good resistance to various corrosive media, helping to protect the reinforcing ridge 106 and support rod 107 from corrosion and erosion. Furthermore, aluminum alloys have good machinability and formability, making it easier to manufacture and install the reinforcing ridge 106 and support rod 107 onto the piston rod 100.

[0038] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A piston assembly for a wear-resistant hydraulic cylinder comprising a piston rod (100), characterized in that: The piston rod (100) includes an inner ring reinforcement layer (101), a filling layer (102), an outer ring reinforcement layer (103), and a reinforcement frame (104) that runs through and integrates the three. The inner ring reinforcement layer (101), the filling layer (102), and the outer ring reinforcement layer (103) are fixedly connected to each other. The outer wall of the outer ring reinforcement layer (103) is provided with a wear-resistant coating (105).

2. A wear resistant hydraulic cylinder piston assembly as claimed in claim 1, characterized in that: The reinforced frame (104) includes an inner ring mesh (141) and an outer ring mesh (142). The inner ring mesh (141) and the outer ring mesh (142) are fixedly connected by multiple reinforcing rods (143). The inner ring reinforcement layer (101) is wrapped around the inner ring mesh (141), and the outer ring reinforcement layer (103) is wrapped around the outer ring mesh (142). The reinforcing rods (143) penetrate through and are fixedly connected to the filling layer (102).

3. A wear resistant hydraulic cylinder piston assembly as claimed in claim 2, characterized in that: The inner ring reinforcement layer (101) is made of 42CrMo alloy steel; the filling layer (102) is made of 7075 aluminum alloy; the outer ring reinforcement layer (103) is made of high carbon chromium steel; and the reinforcement frame (104) is made of spring steel.

4. A wear resistant hydraulic cylinder piston assembly as claimed in claim 3, characterized in that: The wear-resistant coating (105) is made of tungsten carbide thermal spray coating.

5. A wear resistant hydraulic cylinder piston assembly as claimed in claim 4, characterized in that: The inner ring reinforcement layer (101) has multiple annularly distributed reinforcement ridges (106) on its inner wall, and the reinforcement ridges (106) are arranged in the same direction as the length direction of the piston rod (100).

6. A wear resistant hydraulic cylinder piston assembly as claimed in claim 5, characterized in that: A support rod (107) is provided between two adjacent reinforcing protrusions (106).

7. A wear resistant hydraulic cylinder piston assembly as claimed in claim 6, characterized in that: The reinforcing ridge (106) and the support rod (107) are both hollow.

8. A wear resistant hydraulic cylinder piston assembly as claimed in claim 7, characterized in that: The reinforcing ridge (106) and the support rod (107) are made of aluminum alloy.

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