A guide ring assembly and clamping hydraulic cylinder

Abstract

The utility model provides a kind of guide ring assembly and clamping hydraulic cylinder, it is related to hydraulic cylinder field, the scheme used is: including guide ring body, still include multiple spring sheets, multiple spring sheets are set along the circumferential direction of guide ring body inner wall, spring sheet is bow structure, spring sheet is protruding to the center of guide ring body, the protruding position of spring sheet can be abutted with piston, the mounting end of spring sheet is connected with guide ring body, the sliding end of spring sheet can slide relative to guide ring body inner wall, when cylinder rod produces radial deflection, spring sheet occurs elastic deformation, the sliding end can slide along guide ring body inner wall.The utility model can reduce the radial deflection degree of cylinder rod, and then reduce cylinder barrel eccentric wear.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinders, and in particular to a guide ring assembly and a clamping hydraulic cylinder. Background Technology

[0002] In tensile testing of steel bars and other metallic materials, the clamping cylinder is the core actuator of the hydraulic system of the tensile testing machine. Its core function is to reliably clamp the specimen, ensuring that the specimen does not slip or shift during the tensile process, providing a stable clamping foundation for accurately obtaining mechanical property data such as tensile strength and yield strength. Due to axial deviations between the specimen and the piston rod of the clamping cylinder during installation and tensile testing, the piston rod of the clamping cylinder is subjected to radial forces, resulting in uneven wear of core components such as the cylinder rod and the inner wall of the cylinder.

[0003] In existing technology, to reduce wear caused by cylinder rod deflection, a guide ring is installed on the outer circumference of the piston. When the cylinder rod is subjected to radial force, the guide ring will "distribute" the concentrated radial pressure to its entire contact surface instead of allowing the cylinder rod to directly contact the inner wall of the cylinder. This avoids excessive local pressure on the cylinder rod, which could lead to "scratches" or "dents" on the inner wall of the cylinder. The guide ring, through its rigidity and fit, restricts the cylinder rod within the range of the cylinder axis, preventing the cylinder rod from "swinging" or "tilting" and ensuring that the cylinder rod moves linearly along the axis. At the same time, the guide ring can also fill the small assembly gap between the cylinder rod and the piston, reducing the radial movement of the piston within the gap and preventing the cylinder rod from "wobbling" due to the gap, thus improving the accuracy of the cylinder's movement.

[0004] When using the above technical solutions, the tensile force on the sample is large and there is a certain degree of eccentricity during the tensile testing process. This will cause the cylinder rod of the clamping cylinder to bear a large radial force, exceeding the bearing capacity of the guide ring. The guide ring still cannot effectively limit the radial displacement of the cylinder rod, resulting in uneven wear of the clamping cylinder. Utility Model Content

[0005] To address the technical problem of uneven wear in the clamping cylinder of the testing machine in the prior art, this utility model provides a guide ring assembly and a clamping hydraulic cylinder, which can reduce the radial deflection of the cylinder rod and thus reduce uneven wear of the cylinder barrel.

[0006] In a first aspect, this utility model provides a guide ring assembly to solve the above-mentioned technical problems, including a guide ring body and a plurality of spring plates. The plurality of spring plates are arranged circumferentially along the inner wall of the guide ring body. The spring plates have an arc-shaped structure and protrude toward the center of the guide ring body. The protruding position of the spring plate can abut against the piston. The mounting end of the spring plate is connected to the guide ring body, and the sliding end of the spring plate can slide relative to the inner wall of the guide ring body. When the cylinder rod undergoes radial deflection, the spring plate undergoes elastic deformation, and the sliding end can slide along the inner wall of the guide ring body.

[0007] This invention adds a spring plate to the inner wall of the guide ring body. When the piston deflects radially under the drive of the cylinder rod, the spring plate provides a reverse force to the piston through its own elastic deformation, thereby offsetting part of the radial force, reducing the radial deflection of the piston, and thus reducing the radial deflection of the cylinder rod and reducing the wear of the cylinder rod on the cylinder body.

[0008] Furthermore, the mounting end is connected to the guide ring body by screws.

[0009] Furthermore, the sliding end has an arc-shaped structure, and the sliding end protrudes towards the inner wall of the guide ring body, and the protruding position of the sliding end generates sliding friction with the inner wall of the guide ring body.

[0010] This invention, by providing an arc-shaped structure to the sliding end, reduces the friction between the sliding end and the inner wall of the guide ring body, making it easier for the spring sheet to undergo elastic deformation after bearing radial force, thereby improving the sensitivity of the response and preventing jamming.

[0011] Furthermore, the inner wall of the guide ring body is provided with a limiting groove, and the spring sheet is disposed in the limiting groove.

[0012] This utility model, by setting a limiting groove, can prevent the spring sheet from rotating around the screw, ensuring that the spring sheet is always in the preset working position, avoiding interference with other components after the spring sheet is deformed by force, and ensuring the stable performance of its function of hindering the radial deflection of the cylinder rod.

[0013] Furthermore, the bottom of the limiting groove is provided with a hard alloy coating.

[0014] This invention, by applying a hard alloy coating, can further reduce the friction between the sliding end and the limiting groove, while also reducing the friction and wear of the guide ring body and extending its service life.

[0015] Furthermore, the spring sheet is made of spring steel, and the guide ring body is made of bronze-based composite material.

[0016] Secondly, this utility model also provides a clamping hydraulic cylinder, including a cylinder body, a cylinder rod and a piston, wherein the cylinder rod is connected to the piston, the piston is movably disposed inside the cylinder body, and the cylinder also includes the aforementioned guide ring assembly, wherein the guide ring assembly is sleeved on the outer circumferential surface of the piston, and the guide ring body is capable of generating sliding friction with the inner wall of the cylinder.

[0017] Furthermore, two guide ring assemblies are provided, and the two guide ring assemblies are arranged along the axial direction of the piston.

[0018] This invention, by setting two guide ring assemblies, can provide radial support to the cylinder rod from different axial positions of the piston, more comprehensively covering the stress area where the cylinder rod may deflect, and also enhancing the dispersion and cancellation effect of radial force.

[0019] As can be seen from the above technical solutions, this utility model has the following advantages: This utility model provides a guide ring assembly and a clamping hydraulic cylinder. By adding a spring plate to the inner wall of the guide ring body, when the piston deflects radially under the drive of the cylinder rod, the spring plate provides a counterforce to the piston through its own elastic deformation, thereby offsetting part of the radial force, reducing the radial deflection of the piston, and thus reducing the radial deflection of the cylinder rod and reducing the wear of the cylinder rod on the cylinder body. By setting the sliding end with an arc-shaped structure, the friction between the sliding end and the inner wall of the guide ring body can be reduced, making it easier for the spring plate to undergo elastic deformation after bearing radial force, improving the sensitivity of the response and avoiding jamming. The limiting groove prevents the spring plate from rotating around the screw, ensuring that the spring plate is always in the preset working position, avoiding interference with other components after the spring plate is deformed by force, and ensuring the stable performance of its function of hindering the radial deflection of the cylinder rod. The addition of a hard alloy coating can further reduce the friction between the sliding end and the limiting groove, while also reducing the friction and wear of the guide ring body and extending its service life. By setting two guide ring assemblies, radial support can be provided to the cylinder rod from different axial positions of the piston, more comprehensively covering the force area where the cylinder rod may deflect, and also enhancing the dispersion and cancellation effect of radial force. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model. Figure 1 .

[0022] Figure 2This is a schematic diagram of the spring sheet in Embodiment 1 of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the present utility model. Figure 2 .

[0024] Figure 4 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0025] In the figure, 1 is the guide ring body; 101 is the limiting groove; 2 is the spring plate; 201 is the mounting end; 202 is the sliding end; 3 is the screw; 4 is the cylinder body; 5 is the cylinder rod; and 6 is the piston. Detailed Implementation

[0026] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0027] Example 1 like Figures 1 to 3 As shown, this embodiment provides a guide ring assembly, including a guide ring body 1 and multiple spring plates 2. The multiple spring plates 2 are arranged circumferentially along the inner wall of the guide ring body 1. The spring plates 2 have an arc-shaped structure and protrude towards the center of the guide ring body 1. The protruding position of the spring plate 2 can abut against the outer circumferential surface of the piston 6. The mounting end 201 of the spring plate 2 is connected to the guide ring body 1, and the sliding end 202 of the spring plate 2 can slide relative to the inner wall of the guide ring body 1. When the cylinder rod 5 undergoes radial deflection, the spring plate 2 undergoes elastic deformation, and the sliding end 202 can slide along the inner wall of the guide ring body 1. The guide ring body 1 is provided with an opening to facilitate installation and disassembly, allowing the guide ring body 1 to easily expand or contract radially. In this embodiment, four spring plates 2 are provided.

[0028] In this embodiment, a spring plate 2 is added to the inner wall of the guide ring body 1. When the cylinder rod 5 deflects radially, the spring plate 2 can actively bear the radial load. At the same time, its sliding end 202 can slide along the inner wall of the guide ring body 1 to adapt to the deflection position. The elastic deformation of the spring plate 2 is used to buffer and cancel the radial force, reducing the offset of the cylinder rod 5 caused by the concentration of radial force. The flexible movement of the sliding end 202 avoids the spring plate 2 itself from additional wear due to rigid constraints, thereby reducing the radial deflection of the cylinder rod 5 and reducing the wear of the cylinder rod 5 on the cylinder body 4.

[0029] In this embodiment, as Figure 3 As shown, to facilitate the manufacturing of this guide ring assembly, the mounting end 201 of the spring plate 2 is connected to the guide ring body 1 by a screw 3. To prevent the spring plate 2 from rotating around the screw 3 and causing interference, a limiting groove 101 is provided on the inner wall of the guide ring body 1, and the spring plate 2 is disposed in the limiting groove 101. To improve wear resistance and reduce friction, a hard alloy coating is provided on the bottom of the limiting groove 101. Furthermore, to allow the spring plate 2 to deform smoothly, the sliding end 202 has an arc-shaped structure, and the sliding end 202 protrudes towards the inner wall of the guide ring body 1. The protruding position of the sliding end 202 slides against the inner wall of the guide ring body 1. Friction, when configured in this way, has several advantages. First, it improves contact stability, prevents stress concentration that is prone to occur in line contact, and ensures that there will be no jamming due to unstable contact during sliding. Second, it enhances sliding flexibility and adaptability. The arc-shaped structure of the sliding end 202 has a certain elastic deformation space. Combined with the precise contact of the protruding position, it allows the sliding end 202 to better conform to the curvature of the wall surface when sliding along the inner wall, avoiding jamming. This is especially suitable for scenarios where the sliding end 202 needs to frequently adjust its position when the cylinder rod 5 is dynamically deflected. Third, the protruding arc-shaped sliding end 202 can reduce the contact area with the inner wall, reduce the overall sliding friction loss of the spring plate 2, and improve the long-term reliability of the entire guide ring assembly.

[0030] In this embodiment, for applications where the hydraulic cylinder is subjected to heavy loads when using a testing machine to clamp, the spring plate 2 is made of spring steel and the guide ring body 1 is made of bronze-based composite material.

[0031] Example 2 like Figure 4 As shown, this embodiment provides a clamping hydraulic cylinder, including a cylinder body 4, a cylinder rod 5, and a piston 6. The cylinder rod 5 is connected to the piston 6, and the piston 6 is movably disposed inside the cylinder body 4. It also includes a guide ring assembly as described in Embodiment 1. The guide ring assembly is sleeved on the outer circular surface of the piston 6. An annular mounting groove is provided on the outer circular surface of the piston 6, and the guide ring assembly is disposed in the mounting groove. The outer circumferential surface of the guide ring body 1 can generate sliding friction with the inner wall of the cylinder body 4.

[0032] Preferably, two guide ring assemblies are provided, which are arranged along the axial direction of the piston 6, and the opening positions of the guide ring bodies 1 of the two guide ring assemblies are not collinear, and can be arranged on opposite sides.

[0033] This embodiment, by setting two guide ring assemblies, can provide radial support to the cylinder rod 5 from different axial positions of the piston 6, more comprehensively covering the stress area where the cylinder rod 5 may deflect, and also enhancing the dispersion and cancellation effect of radial force.

[0034] As can be seen from the above embodiments, the present invention has the following beneficial effects: 1. By adding a spring plate 2 to the inner wall of the guide ring body 1, when the piston 6 is driven by the cylinder rod 5 to deflect radially, the spring plate 2 provides a reverse force to the piston 6 through its own elastic deformation, thereby offsetting part of the radial force, reducing the radial deflection of the piston 6, and further reducing the radial deflection of the cylinder rod 5, and reducing the wear of the cylinder rod 5 on the cylinder body 4. 2. By setting the sliding end 202 with an arc-shaped structure, the friction between the sliding end 202 and the inner wall of the guide ring body 1 can be reduced, making it easier for the spring sheet 2 to undergo elastic deformation after bearing radial force, thereby improving the sensitivity of the response and avoiding jamming. 3. By setting the limiting groove 101, the spring plate 2 can be prevented from rotating around the screw 3, ensuring that the spring plate 2 is always in the preset working position, avoiding interference with other components after the spring plate 2 is deformed by force, and ensuring the stable performance of its function of hindering the radial deflection of the cylinder rod 5. 4. By setting a hard alloy coating, the friction between the sliding end 202 and the limiting groove 101 can be further reduced, while the friction and wear of the guide ring body 1 can be reduced, thus extending the service life. 5. By setting two guide ring assemblies, radial support can be formed on the cylinder rod 5 from different axial positions of the piston 6, which can more comprehensively cover the stress area where the cylinder rod 5 may deflect, and can also enhance the dispersion and cancellation effect of radial force.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A guide ring assembly, comprising a guide ring body (1), characterized in that, It also includes multiple spring plates (2), which are arranged circumferentially along the inner wall of the guide ring body (1). The spring plates (2) have an arc-shaped structure and protrude toward the center of the guide ring body (1). The protruding position of the spring plate (2) can abut against the piston. The mounting end (201) of the spring plate (2) is connected to the guide ring body (1). The sliding end (202) of the spring plate (2) can slide relative to the inner wall of the guide ring body (1). When the cylinder rod deflects radially, the spring plate (2) undergoes elastic deformation, and the sliding end (202) can slide along the inner wall of the guide ring body (1).

2. The guide ring assembly as claimed in claim 1, characterized in that, The mounting end (201) is connected to the guide ring body (1) by screws (3).

3. The guide ring assembly as described in claim 2, characterized in that, The sliding end (202) has an arc-shaped structure and protrudes into the inner wall of the guide ring body (1). The protruding position of the sliding end (202) generates sliding friction with the inner wall of the guide ring body (1).

4. The guide ring assembly as described in claim 3, characterized in that, The inner wall of the guide ring body (1) is provided with a limiting groove (101), and the spring sheet (2) is disposed in the limiting groove (101).

5. The guide ring assembly as claimed in claim 4, characterized in that, The bottom of the limiting groove (101) is provided with a hard alloy coating.

6. The guide ring assembly according to any one of claims 1-5, characterized in that, The spring sheet (2) is made of spring steel, and the guide ring body (1) is made of bronze-based composite material.

7. A clamping hydraulic cylinder, comprising a cylinder body (4), a cylinder rod (5), and a piston (6), wherein the cylinder rod (5) is connected to the piston (6), and the piston (6) is movably disposed inside the cylinder body (4), characterized in that, It also includes the guide ring assembly as described in claim 6, the guide ring assembly being sleeved on the outer circular surface of the piston (6), and the guide ring body (1) being able to generate sliding friction with the inner wall of the cylinder (4).

8. The clamping hydraulic cylinder as described in claim 7, characterized in that, Two guide ring assemblies are provided, and the two guide ring assemblies are arranged along the axial direction of the piston (6).

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