Anti-loose piston rod connecting structure

Abstract

The utility model relates to an anti-loose piston rod connecting structure which comprises an upper piston assembly, an anti-loose clamping pin, a fixing sleeve, a positioning sleeve and a lower piston assembly, the positioning sleeve is used for coaxially positioning the upper piston assembly and the lower piston assembly, and the fixing sleeve is used for limiting radial movement of the positioning sleeve. The anti-loose clamping pin is arranged at the upper end of the fixing sleeve and clamps the lower end of the upper piston assembly, is used for limiting the fixing sleeve to move in the axial direction, is convenient to disassemble and assemble, does not loosen, is low in manufacturing cost, and can enable the two connected piston rods to be self-adaptively aligned under the condition that the strength of the piston rods is guaranteed. Therefore, the problem of coaxiality deflection caused by machining and assembling errors of parts corresponding to the two piston rods is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of two piston rod connections, in particular to an anti-loosening piston rod connection structure. Background Art

[0002] The piston rod is a connecting component that supports the piston to do work. It is mostly used in oil cylinders and pneumatic cylinder motion actuators. It is a moving component that moves frequently and has high technical requirements.

[0003] In the use of some equipment, two piston rods need to be connected to complete the specified work tasks. However, the existing connection structure of the two piston rods generally adopts threaded connection, pin hole connection, etc. In actual use, there are problems including low strength, easy loosening, difficult disassembly, high cost and coaxial deviation of the two piston rods, which seriously affects the effect and efficiency of the equipment in completing the work tasks.

[0004] Therefore, designing a piston rod connection structure that meets the requirements of high strength, no loosening, easy disassembly, low cost, and adaptive alignment is a technical problem that urgently needs to be solved. Utility Model Content

[0005] In view of this, the utility model provides an anti-loosening piston rod connection structure, in which the upper piston rod and the lower piston rod are connected and fixed by three parts: an anti-loosening pin, a fixing sleeve, and a positioning sleeve. The connection method is simple and reliable, easy to disassemble and assemble, and will not loosen.

[0006] The utility model provides an anti-loosening piston rod connection structure adopts the following technical solutions:

[0007] A piston rod connection structure that prevents loosening includes an upper piston assembly, an anti-loosening pin, a fixing sleeve, a positioning sleeve and a lower piston assembly. The positioning sleeve is used to coaxially position the upper piston assembly and the lower piston assembly, the fixing sleeve is used to limit the radial movement of the positioning sleeve, and the anti-loosening pin is arranged at the upper end of the fixing sleeve and clamps the lower end of the upper piston assembly to limit the axial movement of the fixing sleeve.

[0008] Optionally, the inner circumference of the fixing sleeve is in close contact with the outer circumference of the positioning sleeve.

[0009] Optionally, the positioning sleeve includes two positioning half sleeves symmetrically arranged on the outer circumference of the upper piston assembly, the two positioning half sleeves are symmetrically installed to form a closed annular structure, and the inner circumference of the positioning sleeve is in close contact with the outer circumference of the upper piston assembly and the outer circumference of the lower piston assembly.

[0010] Optionally, the positioning sleeve is clearance-matched with the piston rod of the upper piston assembly and the piston rod of the lower piston assembly.

[0011] Optionally, the fixing sleeve has a positioning chamber for accommodating the positioning sleeve, and the upper end of the fixing sleeve is provided with a connecting hole adapted to the upper piston rod and connected to the positioning chamber, and a lower end opening.

[0012] Optionally, the middle portion of the anti-loosening pin is a pin inner hole, and the pin inner hole is tightly attached to the lower end shaft section of the upper piston rod.

[0013] In summary, the utility model includes at least one of the following beneficial technical effects: easy disassembly and assembly, no loosening, low manufacturing cost, and the ability to ensure the strength of the piston rod while enabling the two connected piston rods to adaptively align their positions, thereby solving the problem of coaxiality deviation caused by processing and assembly errors of the corresponding components of the two piston rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a partial cross-sectional view of an embodiment of the utility model;

[0016] Figure 2 It is a structural schematic diagram of an anti-loosening latch according to an embodiment of the utility model.

[0017] Explanation of the reference numerals: 1. upper piston rod; 2. anti-loosening bayonet pin; 3. fixing sleeve; 4. positioning sleeve; 5. lower piston rod; 6. inner hole of bayonet pin. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0019] The following is combined with Figure 1-2 The utility model is described in further detail.

[0020] The utility model embodiment discloses an anti-loosening piston rod connection structure.

[0021] Reference Figure 1 and Figure 2A locking piston rod connection structure includes an upper piston assembly, an locking pin 2, a fixing sleeve 3, a positioning sleeve 4 and a lower piston assembly. The positioning sleeve 4 is used to coaxially position the upper piston assembly and the lower piston assembly. The fixing sleeve 3 is used to limit the radial movement of the positioning sleeve 4. The locking pin 2 is arranged at the upper end of the fixing sleeve 3 and clamps the lower end of the upper piston assembly to limit the axial movement of the fixing sleeve 3. The structure is easy to disassemble and assemble, will not loosen, has low manufacturing cost, and can ensure the strength of the piston rod while enabling the two connected piston rods to adaptively find their positions, thereby solving the problem of coaxiality deviation caused by processing and assembly errors of the corresponding components of the two piston rods.

[0022] In this embodiment, the lower end surface of the upper piston rod 1 is tightly attached to the upper end surface of the lower piston rod 5, the inner circumference of the positioning sleeve 4 is tightly attached to the outer circumference of the upper piston rod 1 and the lower piston rod 5, the inner circumference of the fixing sleeve 3 is tightly attached to the outer circumference of the positioning sleeve 4, the anti-loosening pin 2 is located at the upper end of the fixing sleeve 3 and clamps the lower end of the upper piston rod 1, and the central axis of the upper piston rod 1 is parallel to the lower piston rod 5.

[0023] In this embodiment, the positioning sleeve 4 includes two positioning half sleeves symmetrically arranged on the outer circumference of the upper piston assembly, and the two positioning half sleeves are symmetrically installed to form a closed annular structure, and the inner circumference of the positioning sleeve 4 is closely attached to the outer circumference of the upper piston assembly and the outer circumference of the lower piston assembly. The positioning sleeve 4 is a set of structures composed of two pairs of halves, and the two pairs of halves are symmetrically installed. The positioning sleeve 4 is a clearance fit with the upper piston rod 1 and the lower piston rod 5.

[0024] In this embodiment, the positioning sleeve 4 is in clearance fit with the piston rod of the upper piston assembly and the piston rod of the lower piston assembly. The inner circle of the positioning sleeve 4 is in clearance fit with the outer circle of the upper piston rod 1 and the lower piston rod 5, which can solve the problem of coaxiality deviation caused by processing and assembly errors of the components corresponding to the two piston rods.

[0025] In this embodiment, the fixing sleeve 3 has a positioning chamber for accommodating the positioning sleeve 4. The upper end of the fixing sleeve 3 is provided with a connecting hole adapted to the upper piston rod 1 and connected to the positioning chamber, and the lower end is open. The fixing sleeve 3 is closed in circumference, with a large hole at the upper end through which the outer circumference of the upper piston rod 1 can pass, and the lower end is open.

[0026] In this embodiment, the middle of the anti-loosening bayonet 2 is a bayonet inner hole 6, which is in close contact with the lower end shaft section of the upper piston rod 1. The anti-loosening bayonet 2 is installed between the top of the fixing sleeve 3 and the outer circle of the upper piston rod 1, and the bayonet inner hole 6 is in close contact with the lower end shaft section of the upper piston rod 1, ensuring that the two piston rods will never loosen.

[0027] The installation principle of the utility model is as follows: the lower end surface of the upper piston rod 1 is overlapped with the upper end surface of the lower piston rod 5, so that the axes of the upper piston rod 1 and the lower piston rod 5 are in parallel and nearly coaxial directions, the fixing sleeve 3 is inserted into the lower shaft section of the upper piston rod 1 from bottom to top, and the two halves of the positioning sleeves 4 are tightly clamped from the outside at the connection between the upper piston and the lower piston rod 5, and then the two pairs of half positioning sleeves 4 are fixed from the outside with the fixing sleeve 3 to prevent the radial movement of the positioning sleeve 4, and finally the inner hole 6 of the anti-loosening pin 2 is clamped at the lower shaft end of the upper piston rod 1 at the upper end of the fixing sleeve 3 to prevent the fixing sleeve 3 from axial movement.

[0028] The disassembly principle of the utility model is as follows: remove the anti-loosening pin 2, move the fixing sleeve 3 upward to make it completely separate from the positioning sleeve 4, remove the two halves of the positioning sleeve 4 from both sides of the upper piston rod 1, and then separate the upper piston rod 1 from the lower piston rod 5.

[0029] The upper piston rod 1 and the lower piston rod 5 of the utility model are connected and fixed by three parts: an anti-loosening card pin 2, a fixing sleeve 3, and a positioning sleeve 4. The connection method is simple and reliable, easy to disassemble and assemble without loosening, and the traditional guide column and guide hole structure at the lower end of the upper piston rod 1 and the upper end of the lower piston rod 5 are eliminated. The structure is simple, the disassembly and assembly are convenient, and the space occupied is small.

[0030] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method and core ideas of the utility model. The above is only the preferred implementation method of the utility model. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principle of the utility model, they can make some improvements, embellishments or changes, and can also combine the above technical features in an appropriate manner; these improvements, embellishments, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the utility model.

Claims

1. An anti-loosening piston rod connection structure, characterized in that: It includes an upper piston assembly, an anti-loosening pin, a fixing sleeve, a positioning sleeve and a lower piston assembly. The positioning sleeve is used to coaxially position the upper piston assembly and the lower piston assembly. The fixing sleeve is used to limit the radial movement of the positioning sleeve. The anti-loosening pin is arranged at the upper end of the fixing sleeve and clamps the lower end of the upper piston assembly to limit the axial movement of the fixing sleeve.

2. The anti-loosening piston rod connection structure according to claim 1, characterized in that: The inner circumference of the fixing sleeve is in close contact with the outer circumference of the positioning sleeve.

3. The anti-loosening piston rod connection structure according to claim 2, characterized in that: The positioning sleeve includes two positioning half sleeves symmetrically arranged on the outer circumference of the upper piston assembly. The two positioning half sleeves are symmetrically installed to form a closed annular structure. The inner circumference of the positioning sleeve is tightly attached to the outer circumference of the upper piston assembly and the outer circumference of the lower piston assembly.

4. The anti-loosening piston rod connection structure according to claim 3, characterized in that: The positioning sleeve is clearance-matched with the piston rod of the upper piston assembly and the piston rod of the lower piston assembly.

5. The anti-loosening piston rod connection structure according to claim 3, characterized in that: The fixing sleeve has a positioning chamber for accommodating the positioning sleeve. The upper end of the fixing sleeve is provided with a connecting hole adapted to the upper piston rod and communicated with the positioning chamber, and a lower end opening.

6. The anti-loosening piston rod connection structure according to claim 1, characterized in that: The middle part of the anti-loosening bayonet is a bayonet inner hole, and the bayonet inner hole is tightly attached to the lower end shaft section of the upper piston rod.

Images