Hydraulic cylinder piston anti-loosening structure and hydraulic cylinder

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder piston anti-loosening structure and a hydraulic cylinder. According to the hydraulic cylinder piston anti-loosening structure, a hydraulic cylinder comprises a piston and a piston rod which are connected, a screw hole is formed between the piston and the piston rod in the axial direction, a perforation screw is arranged in the screw hole, open holes are formed in the circumferential side of the perforation screw at intervals, and threads on the side edges of the open holes are extruded to deform. The hydraulic cylinder piston anti-loosening structure can prevent the piston from loosening, ensures normal matching of the piston and the piston rod in the reciprocating motion process of the piston, and can improve the stability of the hydraulic cylinder structure, improve the use reliability and prolong the service life when being applied to the hydraulic cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder piston anti-loosening structure and a hydraulic cylinder. Background Art

[0002] A hydraulic cylinder, also known as a hydraulic oil cylinder, is an actuator that converts hydraulic energy into mechanical energy. It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] The piston and piston rod of the existing hydraulic cylinder are usually connected by a thread. During assembly, the thread is manually tightened to a required torque. However, when the piston reciprocates in the cylinder, the impact load makes the piston easy to loosen and fall off. Utility Model Content

[0004] In order to solve the above technical problems existing in the prior art, the utility model provides a hydraulic cylinder piston anti-loosening structure and a hydraulic cylinder.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] One of the purposes of the utility model is to provide a hydraulic cylinder piston anti-loosening structure, the hydraulic cylinder comprises a connected piston and a piston rod, a screw hole is axially opened between the piston and the piston rod, a saddle screw is arranged in the screw hole, openings are spaced apart around the circumference of the saddle screw, and the threads on the sides of the openings are squeezed and deformed.

[0007] By adopting the hydraulic cylinder piston anti-loosening structure of the utility model, an impact tool is inserted into the opening and the partition wall between the screw hole and the opening is squeezed to deform it toward the screw hole side. The deformed partition wall is tightly fitted with the inner wall of the screw hole and the saddle screw, and the threads of the screw hole and the saddle screw are damaged, thereby preventing the saddle screw from being screwed out, and further preventing the piston from loosening. During the reciprocating motion of the piston, the piston will not loosen, thereby ensuring the normal cooperation between the piston and the piston rod.

[0008] Based on the above technical solution, the present invention can also make the following technical improvements:

[0009] Furthermore, the depth of the opening is 3-4 mm.

[0010] The beneficial effect of adopting the above further technical solution is that it is easy for the impact tool to extend into a certain depth to cause a certain length of damage to the thread, thereby preventing the saddle screw from being screwed out.

[0011] Furthermore, the distance between the opening and the screw hole is 0.8-1.2 mm.

[0012] The beneficial effect of adopting the above further technical solution is that the use of a partition wall of this thickness is conducive to extrusion deformation, and at the same time it can also avoid the partition wall being too thin, which causes instability when the saddle screw is connected to the screw hole.

[0013] Furthermore, the number of the opening is at least one.

[0014] Further, when the number of the opening is one, the opening is opened on the piston.

[0015] Furthermore, when the number of the openings is not one, the openings are symmetrically arranged in the circumferential direction of the screw hole.

[0016] Furthermore, the number of the openings is two, and the two openings are both arranged at the connection between the piston and the piston rod.

[0017] The beneficial effect of adopting the above further technical solution is: achieving effective destruction of the thread and preventing the saddle screw from being screwed out.

[0018] Furthermore, the piston is threadedly connected to the piston rod.

[0019] The second purpose of the utility model is to provide a hydraulic cylinder, including a cylinder barrel and a piston and a piston rod connected to each other, wherein a cylinder cover is arranged at one end of the cylinder barrel and a cylinder bottom is arranged at the other end, and the above-mentioned hydraulic cylinder piston anti-loosening structure is arranged between the piston and the piston rod.

[0020] Compared with the prior art, the utility model has the following technical effects:

[0021] The hydraulic cylinder piston anti-loosening structure of the utility model can prevent the piston from loosening. During the reciprocating motion of the piston, the piston will not loosen, ensuring the normal cooperation between the piston and the piston rod. Applying this structure to the hydraulic cylinder can improve the stability of the hydraulic cylinder structure, and improve the reliability and service life of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram showing the anti-loosening structure of the hydraulic cylinder piston of the utility model;

[0023] Figure 2 A side view showing the anti-loosening structure of Embodiment 1;

[0024] Figure 3 A side view showing the anti-loosening structure of Example 2;

[0025] Figure 4 A schematic diagram showing the structure of a hydraulic cylinder is shown;

[0026] Reference numerals:

[0027] 1. Piston; 2. Piston rod; 3. Saddle screw; 4. Screw hole; 5. Opening; 6. Cylinder barrel; 7. Cylinder bottom. DETAILED DESCRIPTION

[0028] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0029] See also Figure 1 , a hydraulic cylinder piston anti-loosening structure, the hydraulic cylinder includes a piston 1 and a piston rod 2 that are threadedly connected, a screw hole 4 is axially opened between the piston 1 and the piston rod 2, a saddle screw 3 is arranged in the screw hole 4, and openings 5 ​​for inserting an impact tool are arranged at intervals on the circumference of the saddle screw 3, and the impact tool is used to squeeze the partition wall between the screw hole 4 and the opening 5, so that the thread on the side of the opening 5 is squeezed and deformed, and the deformed partition wall is tightly fitted with the inner wall of the screw hole 4 and the saddle screw 3. Subsequently, an impact force is manually applied to the partition wall through a tool to damage the threads of the screw hole 4 and the saddle screw 3, thereby preventing the saddle screw 3 from being screwed out, and then preventing the piston 1 from loosening. During the reciprocating motion of the piston 1, the piston 1 will not loosen, ensuring the normal cooperation between the piston 1 and the piston rod 2.

[0030] The depth of the opening 5 is 3-4mm, and the spacing between the opening 5 and the screw hole 4 is 0.8-1.2mm. The depth of the opening 5 is set to 3-4mm, which is convenient for the impact tool to extend to a certain depth to cause a certain length of damage to the thread, thereby preventing the saddle screw 3 from being screwed out; the thickness of the partition wall is set to 0.8-1.2mm, which is conducive to its extrusion deformation. If the thickness is too thick, it will be difficult to deform. If the wall thickness is too thin, it will be deformed or even broken during the assembly process of the saddle screw 3, and it is difficult to ensure the stability of the structure.

[0031] See also Figure 2In Example 1, the number of openings 5 ​​is one, and the opening 5 is opened on the piston 1. Before the impact force, the inner wall of the opening 5 close to the screw hole 4 has a position A. The impact tool is manually inserted into the opening 5, and force is applied to the partition wall to deform it toward the side of the screw hole 4. The deformed partition wall is tightly fitted with the inner wall of the screw hole 4 and the saddle screw 3. The inner wall has a position B after the impact. The impact force is manually continued to be applied to damage the threads of the screw hole 4 and the saddle screw 3, and the saddle screw 3 cannot be screwed out, thereby avoiding loosening between the piston 1 and the piston rod 2.

[0032] See also Figure 3 In Example 2, there are two openings 5, and the two openings 5 ​​are symmetrically arranged in the circumference of the screw hole 4, and the two openings 5 ​​are arranged at the connection between the piston 1 and the piston rod 2, that is, a saddle arrangement. An impact tool is manually inserted into the two openings 5, and a force is applied to the partition wall to deform it toward the side of the screw hole 4. The deformed partition wall fits tightly with the inner wall of the screw hole 4 and the saddle screw 3. The impact force is continued to be applied manually to damage the threads of the screw hole 4 and the saddle screw 3, and the saddle screw 3 cannot be screwed out, thereby avoiding loosening between the piston 1 and the piston rod 2.

[0033] See also Figure 4 A hydraulic cylinder comprises a cylinder barrel 6 and a piston 1 and a piston rod 2 connected to each other, wherein a cylinder cover is arranged at one end of the cylinder barrel 6 and a cylinder bottom 7 is arranged at the other end, and the above-mentioned hydraulic cylinder piston anti-loosening structure is arranged between the piston 1 and the piston rod 2.

[0034] The hydraulic cylinder piston anti-loosening structure provided by the utility model can effectively prevent the piston and the piston rod from loosening and falling off. During the reciprocating motion of the piston, the piston will not loosen, thereby ensuring the normal cooperation between the piston and the piston rod. Applying the hydraulic cylinder piston anti-loosening structure to the hydraulic cylinder can improve the stability of the hydraulic cylinder structure, and improve the reliability and service life of the hydraulic cylinder.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder piston anti-loosening structure, the hydraulic cylinder comprising a piston (1) and a piston rod (2) connected to each other, characterized in that: A screw hole (4) is axially provided between the piston (1) and the piston rod (2), a saddle screw (3) is arranged in the screw hole (4), and openings (5) are spaced apart around the circumference of the saddle screw (3), and the threads on the sides of the openings (5) are deformed by extrusion.

2. The hydraulic cylinder piston anti-loosening structure according to claim 1, characterized in that: The depth of the opening (5) is 3-4 mm.

3. The hydraulic cylinder piston anti-loosening structure according to claim 1, characterized in that: The distance between the opening (5) and the screw hole (4) is 0.8-1.2 mm.

4. The hydraulic cylinder piston anti-loosening structure according to claim 1, characterized in that: The number of the opening (5) is at least one.

5. The hydraulic cylinder piston anti-loosening structure according to claim 4, characterized in that: When the number of the opening (5) is one, the opening (5) is opened on the piston (1).

6. The hydraulic cylinder piston anti-loosening structure according to claim 4, characterized in that: When the number of the openings (5) is not one, each of the openings (5) is symmetrically arranged in the circumferential direction of the screw hole (4).

7. The hydraulic cylinder piston anti-loosening structure according to claim 6, characterized in that: The number of the openings (5) is two, and the two openings (5) are both arranged at the connection between the piston (1) and the piston rod (2).

8. The hydraulic cylinder piston anti-loosening structure according to claim 1, characterized in that: The piston (1) is threadedly connected to the piston rod (2).

9. A hydraulic cylinder, characterized in that: The invention comprises a cylinder barrel (6) and a piston (1) and a piston rod (2) which are connected to each other. A cylinder cover is arranged at one end of the cylinder barrel (6) and a cylinder bottom (7) is arranged at the other end. A hydraulic cylinder piston anti-loosening structure according to any one of claims 1 to 8 is arranged between the piston (1) and the piston rod (2).

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