Connecting structure of air cylinder piston and piston rod

Abstract

The utility model belongs to the technical field of air cylinders, and particularly relates to an air cylinder piston and piston rod connecting structure which comprises an air cylinder body, a front end cover, a rear end cover, a piston and a piston rod, an assembly portion is arranged on the piston rod, the piston is sleeved on the assembly portion, and annular assembly grooves are arranged at two ends of the assembly portion on the piston rod. Two opposite semi-rings are sleeved with the annular assembling groove and used for limiting the piston to the assembling part, the portions, located on the two sides of the piston, of the piston rod are sleeved with buffering sleeves, the sides, close to the piston, of the two buffering sleeves are provided with annular clamping grooves, and the annular clamping grooves are used for fixing the two semi-rings in the annular assembling groove. A riveting part is arranged on one side of the buffer sleeve, a riveting groove corresponding to the riveting part is formed in the piston rod, and the riveting part and the piston rod are matched to fix the buffer sleeve; through the matching of the structural design, the connecting structure of the piston rod and the piston is more stable, the structural strength is higher, the piston and the piston rod are effectively prevented from loosening, and the safety is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylinders, and specifically relates to a connecting structure between a cylinder piston and a piston rod. Background Art

[0002] A cylinder is a key component in mechanical automation. It drives a piston to perform linear reciprocating motion through air pressure to achieve power conversion. Cylinders are widely used in automated production lines, robots, automobiles, aerospace and other fields, and are important devices for realizing linear motion.

[0003] Existing cylinders mainly consist of the following parts: cylinder barrel, end covers, piston, piston rod and seals, etc. They have the characteristics of simple structure, fast response speed, large output force, strong adaptability and high reliability. Among them, the piston rod connects the piston and an external load to transmit power. The piston rod and the piston are usually connected and fixed by fixing bolts.

[0004] At present, the connection structure between the piston and the piston rod in the prior art has the following disadvantages: the piston rod and the piston are connected by fixing bolts, and the other end of the piston rod is connected to an external load. Then, the fixing structure of the piston rod and the piston will be subjected to pressure from the external load, and the fixing structure of the fixing bolts is prone to looseness. Moreover, in working conditions with large vibrations, it is also easy to cause the connection structure to loosen and slip, resulting in safety accidents. Therefore, in view of the above problems, a connecting structure between a cylinder piston and a piston rod is proposed. Summary of the Utility Model

[0005] In order to make up for the deficiencies of the existing connection structure between the piston rod and the piston, and to solve the problem that the piston rod and the piston are connected by fixing bolts, and the other end of the piston rod is connected to an external load. Then, the fixing structure of the piston rod and the piston will be subjected to pressure from the external load, and the fixing structure of the fixing bolts is prone to looseness. Moreover, in working conditions with large vibrations, it is also easy to cause the connection structure to loosen and slip, resulting in safety accidents. A connecting structure between a cylinder piston and a piston rod is proposed.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows: A connecting structure between a cylinder piston and a piston rod of the utility model includes a cylinder body, and a front end cover and a rear end cover respectively assembled at both ends of the cylinder body. A piston is slidably assembled in the cylinder body. The piston is sleeved on the piston rod. One end of the piston rod slidably extends outside the front end cover. An assembly part is arranged on the piston rod. The piston is sleeved at the assembly part. Annular assembly grooves are respectively opened at both ends of the piston rod located at the assembly part. Two opposing half rings are sleeved in the annular assembly grooves. The half rings are used to limit the piston at the assembly part. Buffer sleeves are respectively sleeved on both sides of the piston on the piston rod.

[0007] Preferably, annular card slots are formed on one side of each of the two buffer sleeves close to the piston, and the annular card slots are used to fix the two half rings in the annular assembly groove.

[0008] Preferably, a riveting portion is provided on one side of the buffer sleeve, and a riveting groove corresponding to the riveting portion is formed on the piston rod, and the two cooperate to fix the buffer sleeve.

[0009] Preferably, buffer pads are provided on both sides of the piston, and the buffer pads are sleeved on the half rings.

[0010] Advantages of the present utility model:

[0011] The present utility model provides a connection structure between a cylinder piston and a piston rod. Through the cooperation of the structural design of the present utility model, the connection structure between the piston rod and the piston is more stable, the structural strength is higher, and it effectively prevents the piston and the piston rod from loosening or even falling off under working conditions with large loads and strong vibrations, resulting in safety accidents, greatly improving safety, and the connection structure between the cylinder piston and the piston rod is simple and convenient to assemble. Description of the Drawings

[0012] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0013] Figure 1 is the overall structural sectional view;

[0014] Figure 2 is the exploded view of the piston, the piston rod and the connection structure;

[0015] Figure 3 is the structural view of the half ring;

[0016] Legend description:

[0017] 1. Cylinder body; 2. Front end cover; 3. Rear end cover; 4. Piston rod; 401. Assembly portion; 5. Piston; 6. Annular assembly groove; 7. Half ring; 8. Buffer sleeve; 9. Annular card slot; 10. Riveting portion; 11. Riveting groove; 12. Buffer pad. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0019] Specific embodiments are given below.

[0020] Please refer to Figures 1 - 3 , a connection structure between a cylinder piston and a piston rod of the present utility model, which includes a cylinder body 1, and a front end cover 2 and a rear end cover 3 respectively assembled at both ends of the cylinder body 1. A piston 5 is slidably assembled in the cylinder body 1. The piston 5 is sleeved on the piston rod 4. One end of the piston rod 4 slides and extends outside the front end cover 2. An assembly portion 401 is provided on the piston rod 4. The piston 5 is sleeved at the assembly portion 401. Ring-shaped assembly grooves 6 are opened at both ends of the piston rod 4 located at the assembly portion 401. Two opposing half rings 7 are sleeved in the ring-shaped assembly grooves 6. The half rings 7 are used to limit the piston 5 at the assembly portion 401. Buffer sleeves 8 are sleeved on both sides of the piston 5 on the piston rod 4;

[0021] Ring-shaped clamping grooves 9 are opened on one side of each of the two buffer sleeves 8 close to the piston 5. The ring-shaped clamping grooves 9 are used to fix the two half rings 7 in the ring-shaped assembly grooves 6. A riveting portion 10 is provided on one side of the buffer sleeve 8. A riveting groove 11 corresponding to the riveting portion 10 is opened on the piston rod 4. The two cooperate to fix the buffer sleeve 8. During operation, in order to improve the stability of the connection structure between the piston 5 and the piston rod 4, first during assembly, the staff sleeved the piston 5 onto the assembly portion 401 on the piston rod 4, and then loaded two half rings 7 into the ring-shaped assembly grooves 6 on both sides of the piston 5 respectively. At this time, the half rings 7 limit the piston 5 at the assembly portion 401. Then the staff sleeved the buffer sleeves 8 on both sides of the piston 5 on the piston rod 4 and made the buffer sleeves 8 close to the half rings 7 to hoop the half rings 7 in the ring-shaped clamping grooves 9. At this time, the half rings 7 are restricted in the ring-shaped assembly grooves 6 to prevent them from falling off. Then the staff used a riveting machine to fix the buffer sleeves 8. The riveting machine pressed the riveting portion 10 at one end of the buffer sleeve 8 into the riveting groove 11. The riveting portion 10 deformed to fill the riveting groove 11, and the two were tightly engaged to fix the buffer sleeve 8, thereby fixing the piston 5 and the half rings 7. Thus, the assembly of the piston 5 and the piston rod 4 is completed. Through the cooperation of the half rings 7, the ring-shaped assembly grooves 6, the buffer sleeves 8, the ring-shaped clamping grooves 9, the riveting portion 10, and the riveting groove 11, the connection structure between the piston rod 4 and the piston 5 is more stable, the structural strength is higher, and the safety is greatly improved.

[0022] Further, buffer pads 12 are provided on both sides of the piston 5. The buffer pads 12 are sleeved on the half rings 7. During operation, after the piston rod 4 and the piston 5 are assembled, the staff sleeved the buffer pads 12 into the gaps between the buffer sleeves 8 and the piston 5, and on the circumferences of the half rings 7. When the piston 5 moves in the cylinder body 1, the buffer pads 12 provide auxiliary buffering for the piston 5 to ensure the normal operation of the structure.

[0023] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0024] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and the above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed.

Claims

1. A connecting structure between a cylinder piston and a piston rod, comprising a cylinder body (1), and a front end cover (2) and a rear end cover (3) respectively assembled at both ends of the cylinder body (1). A piston (5) is slidably assembled in the cylinder body (1), the piston (5) is sleeved on the piston rod (4), and one end of the piston rod (4) slidably extends to the outside of the front end cover (2), characterized in that: An assembly part (401) is provided on the piston rod (4). The piston (5) is sleeved at the assembly part (401). Annular assembly grooves (6) are formed at both ends of the piston rod (4) located at the assembly part (401). Two opposing half rings (7) are sleeved in the annular assembly grooves (6). The half rings (7) are used to limit the piston (5) at the assembly part (401). Buffer sleeves (8) are sleeved on both sides of the piston rod (4) where the piston (5) is located.

2. The connecting structure between a cylinder piston and a piston rod according to claim 1, characterized in that: Annular clamping grooves (9) are formed on one side of each of the two buffer sleeves (8) close to the piston (5). The annular clamping grooves (9) are used to fix the two half rings (7) in the annular assembly grooves (6).

3. A connecting structure between a cylinder piston and a piston rod according to claim 1, characterized in that: A riveting part (10) is provided on one side of the buffer sleeve (8). A riveting groove (11) corresponding to the riveting part (10) is formed on the piston rod (4). The two cooperate to fix the buffer sleeve (8).

4. A connection structure between a cylinder piston and a piston rod according to claim 1, characterized in that: Buffer pads (12) are provided on both sides of the piston (5). The buffer pads (12) are sleeved on the half rings (7).

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