Anti-rotation fitting

Abstract

The utility model discloses an anti-rotation fitting, which comprises a shaft rod, a cylinder barrel and an end cover, and the shaft rod extends along the axial direction and comprises a flat section. Flat parts are arranged at the two ends of the flat section in the radial direction, and the flat parts extend in the axial direction. The cylinder barrel comprises a mounting channel extending in the first direction, and the shaft rod penetrates through the mounting channel. A first step part is arranged at the top of the mounting channel. The end cover is arranged corresponding to the first step part in the axial direction and is in threaded connection with the first step part. The end cover is provided with a positioning through hole corresponding to the flat section in size and used for being attached to the flat section for limiting. The design of the flat section and the flat part of the shaft rod provides extra stability, the shaft rod is prevented from rotating or shifting in the installation or use process, the threaded connection of the end cover and the first step part ensures that the end cover can be accurately positioned on the shaft rod, the installation process is simplified, the end cover can be conveniently installed and detached, and the installation efficiency is improved. And maintenance and replacement are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-rotation buffer parts, and particularly relates to an anti-rotation fitting. Background Art

[0002] In the prior art, a structure with steel balls inlaid is often adopted to prevent the rotation of the fitting rod. By using the movement of the steel balls in the steel ball grooves, the up-and-down movement of the cylinder barrel is achieved, and then by using the way that the steel balls can only move in the inherent grooves, the function of limiting anti-rotation is achieved. For product processing, it is difficult to position and detect the size of the steel ball groove position, and due to the large frictional resistance between the steel balls and the processed parts, when the product is used, a relatively large frictional resistance sound is easily generated, affecting the user experience. Content of the Utility Model

[0003] In order to overcome the above-mentioned drawbacks, the purpose of the utility model is to provide an anti-rotation fitting to solve the problems raised in the above background art.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is an anti-rotation fitting, including:

[0005] A shaft rod extending along the axial direction, including a flat position section. Both ends of the flat position section in the radial direction are provided with flat portions, and the flat portions extend along the axial direction.

[0006] A cylinder barrel including an installation channel extending in a first direction, and the shaft rod is inserted into the installation channel. A first step portion is provided at the top of the installation channel.

[0007] An end cover is arranged corresponding to the first step portion along the axial direction and is threadedly connected to the first step portion. The end cover is provided with a positioning through hole corresponding to the size of the flat position section for fitting and limiting with the flat position section, and the axial direction is perpendicular to the radial direction.

[0008] The anti-rotation fitting provided by the utility model cancels the original steel ball inlaid structure with large frictional force and changes it to a flat position anti-rotation structure. The design of the flat position section and the flat portions of the shaft rod provides additional stability, preventing the shaft rod from rotating or shifting during installation or use. The threaded connection between the end cover and the first step portion ensures that the end cover can be accurately positioned on the shaft rod, simplifies the installation process, enables the end cover to be conveniently installed and disassembled, and is convenient for maintenance and replacement. The positioning through hole of the end cover corresponds to the size of the flat position section of the shaft rod, enabling the end cover to be closely attached and restricting the rotation of the shaft rod, thereby realizing the anti-rotation function.

[0009] In some embodiments, the shaft rod further includes a smooth section, and the smooth section is arranged below the flat position section. The diameter of the smooth section is smaller than the diameter of the flat position section, and a transition step is formed at the connection between the two.

[0010] With the above technical solution, the design of the smooth section provides a certain degree of flexibility, allowing the shaft to have a certain amount of axial movement space without rotation.

[0011] In some embodiments, a second stepped portion is provided at the bottom of the installation channel, and the second stepped portion is disposed in contact with the smooth section. Along the radial direction, the first stepped portion is disposed outside the installation channel, and the second stepped portion is disposed inside the installation channel.

[0012] With the above technical solution, the second stepped portion disposed in contact helps to reduce the movement of the shaft caused by vibration or impact, thereby improving the stability of the system. In addition, the shaft can ensure no rotation or wobbling by changing the tolerances of the positioning through holes of the end cover and the second stepped portion of the cylinder barrel.

[0013] In some embodiments, the anti-rotation fitting further includes a spring, the spring extends along the axial direction, is located inside the installation channel, and is sleeved on the shaft. The top of the spring abuts against the transition stepped portion, and the bottom bears on the second stepped portion.

[0014] With the above technical solution, the spring can absorb the impact and vibration generated during the movement of the shaft, and perform the reset action of the fitting through the recovery of the elastic deformation of the spring.

[0015] In some embodiments, the material of the end cover is POM plastic (Polyoxymethylene (Polyformaldehyde), Chinese name polyoxymethylene resin).

[0016] With the above technical solution, POM plastic has high strength and rigidity, which enables the end cover to withstand large loads, as well as good self-lubricating properties and wear resistance, helping to reduce the friction between the end cover and the shaft, making the movement of the shaft smoother and the sound during movement smaller.

[0017] In some embodiments, along the axial direction, the bottom of the end cover is not lower than the transition stepped portion.

[0018] With the above technical solution, the bottom of the end cover not being lower than the transition stepped portion can ensure the tight fit between the end cover and the flat section of the shaft, effectively preventing the shaft from rotating inside the end cover.

[0019] In some embodiments, an external thread section is provided at one end of the smooth section away from the flat section along the axial direction, the diameter of the external thread section is smaller than the diameter of the smooth section, and a third stepped portion is formed at the connection between the two.

[0020] The anti-rotation fitting further includes a tail cover. The tail cover is arranged below the cylinder along the axial direction, and a groove corresponding to the shaft rod is provided at the top. A limiting step is provided at the top of the groove, and an internal thread section adapted to the external thread is provided on the side wall, for abutting and limiting through the third step portion and the step portion after the internal thread section is connected to the external thread section.

[0021] Adopting the above technical solution, the third step portion serves as a stress buffer zone, reducing stress concentration at the connection, and improving the structural stability and durability. The connection between the internal thread section and the external thread section effectively prevents the rotation of the shaft rod through the cooperation of the limiting step.

[0022] In some embodiments, a limiting portion is provided at one end of the flat portion away from the smooth portion; the limiting portion is correspondingly arranged with the end cover.

[0023] Adopting the above technical solution, the top of the anti-rotation fitting is limited by the contact between the top of the end cover and the limiting portion, and the bottom is limited by the contact between the tail cover and the cylinder, achieving the effect of controlling the stroke of the fitting. Description of the Drawings

[0024] Figure 1 Is a perspective view of an embodiment of an anti-rotation fitting of the present invention;

[0025] Figure 2 Is a partial structural schematic diagram of an embodiment of an anti-rotation fitting of the present invention;

[0026] Figure 3 Is a sectional view of an embodiment of an anti-rotation fitting of the present invention;

[0027] Figure 4 Is a perspective view of the cylinder of an embodiment of an anti-rotation fitting of the present invention;

[0028] Figure 5 Is a perspective view of the tail cover of an embodiment of an anti-rotation fitting of the present invention;

[0029] In the figure:

[0030] 1. Anti-rotation fitting; 2. Shaft rod; 20. Flat portion; 200. Flattened portion; 21. Smooth portion; 22. Transition step; 23. External thread section; 24. Third step portion; 25. Limiting portion; 3. Cylinder; 30. Installation channel; 31. First step portion; 32. Second step portion; 4. End cover; 40. Positioning through hole; 5. Spring; 6. Tail cover; 60. Groove; 61. Limiting step. Detailed Embodiments

[0031] The following will elaborate on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0032] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in this technology can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0033] It should be noted that in the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0034] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In the description of this application, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this application and simplifying the description. Without contrary explanations, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the protection scope of this application; the orientation words "inner, outer" refer to the inside and outside relative to the outline of each component itself.

[0036] Refer to Figures 1 to 5 ,Figure 1 Shows a three-dimensional view of an anti-rotation fitting 1 provided by an embodiment of the present utility model; Figure 2 Shows a partial structural schematic diagram of an anti-rotation fitting 1 provided by an embodiment of the present utility model;

[0037] Figure 3 Shows a sectional view of an anti-rotation fitting 1 provided by an embodiment of the present utility model; Figure 4 Shows a three-dimensional view of a cylinder barrel 3 in an anti-rotation fitting 1 provided by an embodiment of the present utility model; Figure 5 Shows a three-dimensional view of a tail cover 6 in an anti-rotation fitting 1 provided by an embodiment of the present utility model.

[0038] As Figures 1 to 5 shown, the technical solution adopted by the present utility model is an anti-rotation fitting 1, which includes a shaft rod 2, a cylinder barrel 3 and an end cover 4. Among them, the shaft rod 2 extends along the axial direction ( Figure 1 shown by the Z direction in Figure 1 ), and includes a flat section 20. Both ends of the flat section 20 in the radial direction ( Figure 1 shown by the λ direction in Figure 1 ) are provided with flat portions 200, and the flat portions 200 extend along the axial direction. The cylinder barrel 3 includes an installation channel 30 extending in a first direction, and the shaft rod 2 is inserted through the installation channel 30. The top of the installation channel 30 is provided with a first step portion 31. The end cover 4 is arranged corresponding to the first step portion 31 along the axial direction and is threadedly connected to the first step portion 31. The end cover 4 is provided with a positioning through hole 40 corresponding to the size of the flat section 20 for fitting and limiting with the flat section 20, and the axial direction is perpendicular to the radial direction.

[0039] For the anti-rotation fitting 1 provided by the present application, the original steel ball inlay structure with relatively large friction is cancelled and changed to a flat-position anti-rotation structure. The design of the flat section 20 and the flat portions 200 of the shaft rod 2 provides additional stability, preventing the shaft rod 2 from rotating or shifting during installation or use. The threaded connection between the end cover 4 and the first step portion 31 ensures that the end cover 4 can be accurately positioned on the shaft rod 2 and simplifies the installation process, enabling the end cover 4 to be conveniently installed and disassembled, facilitating maintenance and replacement. The positioning through hole 40 of the end cover 4 corresponds to the size of the flat section 20 of the shaft rod 2, enabling the end cover 4 to closely fit and restrict the rotation of the shaft rod 2, thereby realizing the anti-rotation function.

[0040] Specifically, as Figure 2 shown, the outer side of the end cover 4 is provided with an external thread, then the inner side of the first step portion 31 is correspondingly provided with an internal thread. Before installing the end cover 4, glue can be applied to the surface of the external thread to enhance the stability of the threaded connection between the end cover 4 and the first step portion 31.

[0041] In some embodiments, referring to Figures 1 to 5, the shaft rod 2 further includes a smooth section 21, and the smooth section 21 is disposed below the flat section 20. The diameter of the smooth section 21 is smaller than that of the flat section 20, and a transition step 22 is formed at the connection between the two.

[0042] Exemplarily, the design of the smooth section 21 provides a certain degree of flexibility, allowing the shaft rod 2 to have a certain axial movement space without rotation.

[0043] In some embodiments, referring to Figures 1 to 5 , a second step portion 32 is provided at the bottom of the installation channel 30, and the second step portion 32 is arranged in a fitting manner with the smooth section 21. In the radial direction, the first step portion 31 is arranged outside the installation channel 30, and the second step portion 32 is arranged inside the installation channel 30.

[0044] Exemplarily, the fitting second step portion 32 helps to reduce the movement of the shaft rod 2 caused by vibration or impact, thereby improving the stability of the system. In addition, the shaft rod 2 can ensure no rotation or wobbling by changing the tolerances of the positioning through hole 40 of the end cap 4 and the second step portion 32 of the cylinder barrel 3.

[0045] In some embodiments, referring to Figures 1 to 5 , the anti-rotation fitting 1 further includes a spring 5. The spring 5 extends axially, is located inside the installation channel 30, and is sleeved on the shaft rod 2. The top of the spring 5 abuts against the transition step 22, and the bottom bears on the second step portion 32.

[0046] Exemplarily, the spring 5 can absorb the impact and vibration generated during the movement of the shaft rod 2, and perform the reset action of the fitting through the recovery of the elastic deformation of the spring 5.

[0047] In some embodiments, the material of the end cap 4 is POM plastic.

[0048] Exemplarily, POM plastic has very high strength and rigidity, which enables the end cap 4 to withstand a large load, as well as good self-lubricating properties and wear resistance, helping to reduce the friction between the end cap 4 and the shaft rod 2, making the movement of the shaft rod 2 smoother and the sound during movement smaller.

[0049] In some embodiments, axially, the bottom of the end cap 4 is not lower than the transition step 22.

[0050] Exemplarily, the bottom of the end cap 4 not being lower than the transition step 22 can ensure the tight fit between the end cap 4 and the flat section 20 of the shaft rod 2, effectively preventing the shaft rod 2 from rotating inside the end cap 4.

[0051] In some embodiments, referring to Figures 1 to 5, an external thread section 23 is provided at one end of the smooth section 21 along the axial direction away from the flat section 20. The diameter of the external thread section 23 is smaller than that of the smooth section 21, and a third step portion 24 is formed at the connection between the two.

[0052] The anti-rotation fitting 1 further includes a tail cover 6. The tail cover 6 is arranged below the cylinder barrel 3 along the axial direction, and a groove 60 corresponding to the shaft rod 2 is provided at the top. A limiting step 61 is provided at the top of the groove 60, and an internal thread section adapted to the external thread is provided on the side wall, which is used to abut and limit through the third step portion 24 and the step portion after the internal thread section is connected to the external thread section 23.

[0053] Exemplarily, the third step portion 24 serves as a stress buffer zone, reducing stress concentration at the connection, and improving the structural stability and durability. The connection between the internal thread section and the external thread section 23 effectively prevents the rotation of the shaft rod 2 through the cooperation of the limiting step 61.

[0054] In some embodiments, refer to Figures 1 to 5 , a limiting portion 25 is provided at one end of the flat section 20 away from the smooth section 21; the limiting portion 25 is correspondingly arranged with the end cover 4.

[0055] Exemplarily, the top of the anti-rotation fitting 1 is in contact and limited by the top of the end cover 4 and the limiting portion 25, and the bottom is in contact and limited by the tail cover 6 and the cylinder barrel 3, achieving the function of controlling the stroke of the fitting.

[0056] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An anti-rotation hardware, characterized in that: include: The shaft extends in the axial direction and comprises a flat section; both ends of the flat section in the radial direction are provided with flat parts, and the flat parts extend in the axial direction; The cylinder comprises a mounting channel extending in a first direction, wherein the shaft rod passes through the mounting channel; a first step portion is provided at the top of the mounting channel; The end cover is arranged along the axial direction corresponding to the first step portion and is threadedly connected to the first step portion; the end cover is provided with a positioning through hole corresponding to the size of the flat segment, which is used to fit and limit the flat segment, and the axial direction is perpendicular to the radial direction.

2. The anti-rotation fitting according to claim 1, characterized in that: The shaft rod further comprises a smooth section, and the smooth section is arranged below the flat section; the diameter of the smooth section is smaller than the diameter of the flat section, and a transition step is formed at the connection between the two sections.

3. The anti-rotation fitting according to claim 2, characterized in that: A second step portion is provided at the bottom of the installation channel, and the second step portion is arranged in close contact with the smooth section; along the radial direction, the first step portion is provided on the outer side of the installation channel, and the second step portion is provided on the inner side of the installation channel.

4. The anti-rotation fitting according to claim 3, characterized in that: It also includes a spring, which extends along the axial direction, is located in the installation channel, and is sleeved on the shaft rod; the top of the spring abuts against the transition step, and the bottom is supported by the second step portion.

5. The anti-rotation fitting according to claim 1, characterized in that: The material of the end cover is POM plastic.

6. The anti-rotation fitting according to claim 2, characterized in that: Along the axial direction, the bottom of the end cover is not lower than the transition step.

7. The anti-rotation fitting according to claim 2, characterized in that: An end of the smooth section away from the flat section along the axial direction is provided with an external thread section, the diameter of the external thread section is smaller than the diameter of the smooth section, and a third step portion is formed at the connection between the two.

8. The anti-rotation fitting according to claim 7, characterized in that: It also includes a tail cover; the tail cover is arranged below the cylinder along the axial direction, and a groove corresponding to the shaft rod is provided on the top; a limiting step is provided on the top of the groove, and an internal thread section adapted to the external thread is provided on the side wall, which is used to abut and limit the step section through the third step section when the internal thread section is connected to the external thread section.

9. The anti-rotation fitting according to claim 2, characterized in that: A limiting portion is provided at one end of the flat section away from the smooth section; the limiting portion is arranged corresponding to the end cover.

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