Pneumatic buffer

Abstract

The utility model relates to a pneumatic buffer and belongs to pneumatic buffer equipment. According to the technical scheme, the pneumatic buffer comprises a cylinder body and a piston rod, a front guide cavity, a middle cavity and a rear guide cavity are formed in the cylinder body, the front guide cavity is a cylindrical cavity, the inner diameter of the front guide cavity is smaller than that of the middle cavity, and the rear guide cavity is a cylindrical cavity, and the inner diameter of the rear guide cavity is smaller than that of the middle cavity; the rear end of the piston rod is provided with a three-variable-diameter piston, the three-variable-diameter piston is divided into a front compression piston at the front end, a sealing piston in the middle and a rear compression piston at the rear end, the inner diameter of the front compression piston is consistent with and matched with that of the front guide cavity, and the inner diameter of the rear compression piston is consistent with and matched with that of the rear guide cavity; the front guide cavity and the rear guide cavity are communicated through external air pressure, and all air chambers and connectors are sealed. The impact force of sports equipment at the sports tail end can be reduced, the impact of the tail end is converted into gas compression and negative pressure expansion, and the movement speed and stress are buffered.

Description

Technical Field

[0001] The utility model relates to a pneumatic buffer, belonging to a pneumatic buffer device. Background Art

[0002] Some of the current repetitively operated cylinders usually do not have a buffer structure at the rear end of the movement, and directly impact the front and rear ends of the moving equipment, and then stop or reverse the movement.

[0003] Taking coal gangue sorting equipment as an example, it uses a cylinder for reciprocating operation. At the end of the operation, due to the heavy structure of the sorting plate, the impact force caused by inertia is large, which causes impact on the components at the end of the movement, affecting the life and stability of the product.

[0004] This requires buffering at the end of the movement to prevent the equipment from being damaged too quickly under repeated impact.

[0005] The buffer devices currently used are mostly springs, which have a limited number of impacts and require frequent replacement and maintenance, resulting in frequent downtime. Summary of the Invention

[0006] In view of the above problems, the present invention provides a pneumatic buffer to solve the buffering problem of pneumatic or hydraulic equipment at the end of movement and improve the service life of the product.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] The utility model pneumatic buffer comprises a cylinder body and a piston rod.

[0009] The cylinder body is provided with a front guide cavity, an intermediate cavity and a rear guide cavity. The front guide cavity is a cylindrical cavity with an inner diameter smaller than that of the intermediate cavity, and the rear guide cavity is a cylindrical cavity with an inner diameter smaller than that of the intermediate cavity.

[0010] A three-diameter reducing piston is provided at the rear end of the piston rod. The three-diameter reducing piston is divided into a front compression piston at the front end, a sealing piston in the middle and a rear compression piston at the rear end. The front compression piston is consistent with and matched with the inner diameter of the front guide cavity, and the rear compression piston is consistent with and matched with the inner diameter of the rear guide cavity.

[0011] The front guide cavity and the rear guide cavity are connected through external air pressure, and all air chambers and interfaces are sealed.

[0012] According to the pneumatic buffer, the cylinder body is divided into a front end part, a rear end part and a cylindrical body in the middle. The front end part is provided with a gas A port, the front guide cavity is arranged in the front end part, and the gas A port is connected to the front guide cavity. The rear end part is provided with a gas B port, the rear guide cavity is arranged in the rear end part, and the gas B port is connected to the rear guide cavity.

[0013] According to the pneumatic buffer, a telescopic hole is opened at the front end of the front end member and is connected to the front guide cavity, and the front end of the piston rod passes through the front guide cavity and the telescopic hole.

[0014] According to the pneumatic buffer, a connecting screw is provided at the front end of the piston rod, a connecting piece is installed on the connecting screw, and a connecting pin hole is provided at the front end of the connecting piece.

[0015] According to the pneumatic buffer, a T-shaped piece is provided at the rear of the rear end member, the T-shaped plane is fixed on the rear end surface of the rear end member, and a pin hole is opened on the vertical plate surface for connection and fixation.

[0016] The advantages of the present invention are:

[0017] It can reduce the impact force of sports equipment at the end of exercise, convert the end impact into gas compression and negative pressure expansion, buffer the movement speed and force, and increase the service life of sports equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cutaway structural diagram of the utility model.

[0019] Figure 2 This is a structural diagram of the utility model in the buffer state.

[0020] Figure 3 It is a cutaway view of the present utility model.

[0021] Reference numerals:

[0022] 1 Cylinder body, 2 Piston rod, 3 Front guide chamber, 4 Intermediate chamber, 5 Rear guide chamber, 6 Front compression piston, 7 Sealing piston, 8 Rear compression piston, 9 T-shaped fitting, 10 Connecting fitting, 11 Front fitting, 12 Rear fitting, 13 Cylindrical body, 14 Gas port A, 15 Gas port B, 16 High-pressure gas pipe, 17 Front sealing structure, 18 Rear sealing structure. DETAILED DESCRIPTION

[0023] The specific contents of the present invention are further described below:

[0024] The pneumatic buffer of the utility model comprises a cylinder body 1 and a piston rod 2. A front guide cavity 3, an intermediate cavity and a rear guide cavity 5 are provided inside the cylinder body 1. The front guide cavity 3 is a cylindrical cavity with an inner diameter smaller than that of the intermediate cavity. The rear guide cavity 5 is a cylindrical cavity with an inner diameter smaller than that of the intermediate cavity.

[0025] A three-diameter reducing piston is provided at the rear end of the piston rod 2. The three-diameter reducing piston is divided into a front compression piston 6 at the front end, a sealing piston 7 in the middle and a rear compression piston 8 at the rear end. The front compression piston 6 is consistent with and matched with the inner diameter of the front guide cavity 3, and the rear compression piston 8 is consistent with and matched with the inner diameter of the rear guide cavity 5.

[0026] During forward buffering, the front compression piston 6 enters the front guide chamber 3. This stage is the forward terminal speed buffering, reducing the speed. The front compression piston 6 enters the front guide chamber 3. This stage is the forward terminal speed buffering, reducing the speed. The front guide chamber 3 and the rear guide chamber 5 are connected by external air pressure, and all air chambers and interfaces are sealed.

[0027] The cylinder body 1 is divided into a front end part 11, a rear end part 12 and a middle cylindrical body 13. The front end part 11 is provided with a gas A port, the front guide chamber 3 is provided in the front end part 11, and the gas A port is connected to the front guide chamber 3. The rear end part 12 is provided with a gas B port, the rear guide chamber 5 is provided in the rear end part 12, and the gas B port is connected to the rear guide chamber 5.

[0028] A telescopic hole is opened at the front end of the front end member 11 and is connected to the front guide cavity 3 , and the front end of the piston rod 2 passes through the front guide cavity 3 and the telescopic hole.

[0029] The front end of the piston rod 2 is provided with a connecting screw, which is installed on a connecting piece, and the front end of the connecting piece is provided with a connecting pin hole. The rear end of the rear end piece 12 is provided with a T-shaped piece 9, the flat surface of the T is fixed to the rear end surface of the rear end piece 12, and the vertical plate surface is provided with a pin shaft hole for connection and fixation.

[0030] The use of this device:

[0031] Forward movement buffering: when the piston rod moves forward under the pull of the moving part, the three-diameter reducing piston moves forward with the piston rod, and the gas enters the gas port B through the front guide cavity of the intermediate cavity, the gas port A and the high-pressure gas pipe, and then flows into the rear guide cavity;

[0032] After the current compression piston 6 enters the front guide chamber, the gas in the middle chamber is compressed, that is, the front end part, the front compression piston 6, the sealing piston and the chamber surrounded by the cylinder body form a front sealing structure. The piston rod continues to be pulled outward, and the gas in the front sealing structure is compressed. The forward motion of the front compression piston 6 is decelerated, and the reaction acts as the piston rod, realizing the buffering of the forward speed of the piston rod, and then applied to the power mechanism to realize the buffering at the end of the forward process.

[0033] Forward movement buffering, when the piston rod moves backward under the pull of the moving part, the three-diameter reducing piston moves backward with the piston rod, and the gas enters the rear guide cavity, the gas port B and the high-pressure gas pipe into the gas port A at the rear end of the middle cavity, and then flows into the front guide cavity;

[0034] When the rear compression piston enters the rear guide chamber, the space composed of the sealing piston, the rear compression piston, the rear end part and the cylinder body in the three-diameter piston forms a rear sealing structure, in which the gas is compressed, and the gas is compressed to do work. The backward motion of the rear compression piston 6 is decelerated, and the reaction acts as the piston rod, realizing the buffering of the piston rod backward speed, and then applied to the power mechanism to realize the buffering at the end of the backward process.

Claims

1. A pneumatic buffer comprising a cylinder (1) and a piston rod (2), characterized in that: A front guide cavity (3), an intermediate cavity, and a rear guide cavity (5) are provided inside the cylinder body (1); the front guide cavity (3) is a cylindrical cavity with an inner diameter smaller than that of the intermediate cavity; and the rear guide cavity (5) is a cylindrical cavity with an inner diameter smaller than that of the intermediate cavity. A three-diameter reducing piston is provided at the rear end of the piston rod (2), and the three-diameter reducing piston is divided into a front compression piston (6) at the front end, a sealing piston (7) in the middle, and a rear compression piston (8) at the rear end. The front compression piston (6) is consistent with and matches the inner diameter of the front guide cavity (3), and the rear compression piston (8) is consistent with and matches the inner diameter of the rear guide cavity (5). The front guide cavity (3) and the rear guide cavity (5) are connected via external air pressure, and all air chambers and interfaces are sealed.

2. The pneumatic buffer according to claim 1, wherein: The cylinder body (1) is divided into a front end member (11), a rear end member (12) and a central cylindrical body (13). The front end member (11) is provided with a gas port A. The front guide chamber (3) is provided in the front end member (11). The gas port A is connected to the front guide chamber (3). The rear end member (12) is provided with a gas port B. The rear guide chamber (5) is provided in the rear end member (12). The gas port B is connected to the rear guide chamber (5).

3. The pneumatic buffer according to claim 2, wherein: The front end of the front end member (11) is provided with a telescopic hole in communication with the front guide cavity (3), and the front end of the piston rod (2) passes through the front guide cavity (3) and the telescopic hole.

4. The pneumatic buffer according to claim 2, wherein: The front end of the piston rod (2) is provided with a connecting screw, the connecting screw is mounted on a connecting piece, and the front end of the connecting piece is provided with a connecting pin hole.

5. The pneumatic buffer according to claim 2, wherein: A T-shaped piece (9) is provided at the rear of the rear end piece (12), the T-shaped plane is fixed on the rear end surface of the rear end piece (12), and a pin hole is opened on the vertical plate surface for connection and fixation.

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