Single-action quick-retraction air cylinder

Abstract

The utility model discloses a single-action quick-contraction air cylinder which comprises a cylinder body, a piston and a piston rod are arranged in the cylinder body, an air inlet communicated with a rod cavity is formed in the front end of the cylinder body, an air outlet communicated with a rodless cavity is formed in the rear end of the cylinder body, a buffer plate is arranged at the tail end of the piston rod in a sleeved mode, and the buffer plate and the piston are arranged in a spaced mode. A spring is embedded in the buffer plate, and the other end of the spring is attached to the piston. By means of the mode, the single-action quick-retraction air cylinder can buffer the piston through the spring and the buffer plate, the piston is prevented from impacting the cylinder bottom at a high speed, the structure is simple, the buffer effect is good, and the machining precision requirement of the air cylinder is lowered.

Description

Technical Field

[0001] The utility model relates to the field of cylinders, in particular to a single-acting fast-shrinking cylinder with a buffer structure. Background Art

[0002] The cylinder refers to a cylindrical metal part that guides the piston to perform linear reciprocating motion in the cylinder. The existing single-acting cylinder has a cylinder diameter of 430mm, a stroke of 5 meters, a single-acting fast-retracting cylinder, a high-speed cylinder of 7m / s, and 200℃ high-temperature and high-speed gas entering the small cavity. In order to slow down the piston when it approaches the bottom of the cylinder, gas throttling is generally used, but the gas structure has high requirements for processing accuracy, and there is a back pressure problem when the cylinder moves at high speed. At the same time, the cylinder has no oil dry friction, and the life of the seal is short. Summary of the invention

[0003] The main technical problem solved by the utility model is to provide a single-acting fast-retracting cylinder, which can buffer the piston through a spring and a buffer plate to prevent the piston from hitting the cylinder bottom at high speed. It has a simple structure, good buffering effect, and reduces the machining accuracy requirements of the cylinder.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a single-acting quick-retraction cylinder, including a cylinder body, a piston and a piston rod are arranged in the cylinder body, an air inlet connected to the rod chamber is opened at the front end of the cylinder body, and an exhaust port connected to the rodless chamber is opened at the rear end, the end of the piston rod is sleeved with a buffer plate, the buffer plate and the piston are spaced apart, a spring is embedded in the buffer plate, and the other end of the spring is in contact with the piston.

[0005] In a preferred embodiment of the present invention, an annular installation cavity is provided on the inner side of the buffer plate, and a plurality of the springs are arranged in the annular installation cavity.

[0006] In a preferred embodiment of the present utility model, a plurality of guide rings are arranged between the buffer plate and the piston rod.

[0007] In a preferred embodiment of the present invention, a nut is connected to the end of the piston rod, and the nut contacts the buffer plate to position the buffer plate.

[0008] In a preferred embodiment of the present invention, a groove body matching with a nut is provided at the bottom of the cylinder at the rear end of the cylinder body.

[0009] In a preferred embodiment of the present invention, the cylinder body and the cylinder bottom are detachably connected via screws.

[0010] In a preferred embodiment of the utility model, the cylinder bottom is provided with an exhaust port connected to the rodless chamber.

[0011] In a preferred embodiment of the utility model, a guide sleeve is provided at the front end of the cylinder body, a lubricating oil channel is opened on the guide sleeve, and the grease in the lubricating oil channel flows to the surface of the piston rod.

[0012] The utility model has the beneficial effects that: when the piston of the utility model is retracted, the buffer plate and the spring contact the cylinder bottom for buffering, and the buffering energy consumption is realized by spring compression, so that the piston is prevented from being directly impacted.

[0013] The utility model discloses a single-acting quick-retraction cylinder, wherein a lubricating oil channel is provided on a guide sleeve, and lubricating grease flows to a piston rod through the lubricating oil channel, thereby avoiding dry friction between the piston rod and a sealing component, and prolonging the service life of the sealing component.

[0014] The utility model discloses a single-acting quick-retraction cylinder, wherein the cylinder body and the cylinder bottom adopt a detachable structure, which is convenient for the later maintenance of the sealing parts and the piston lubricating coating. A vent hole is opened at the tail of the cylinder to ensure that there is no resistance before the piston rod enters the buffer distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 This is a structural schematic diagram of a preferred embodiment of the single-acting fast-retracting cylinder of the utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the local structure;

[0018] The components in the accompanying drawings are marked as follows: 1. cylinder body, 2. piston, 3. piston rod, 4. air inlet, 5. guide sleeve, 6. lubricating oil channel, 7. buffer plate, 8. nut, 9. spring, 10. guide ring, 11. cylinder bottom. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiment of the utility model will be described clearly and completely below. The structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of narration, and are not used to limit the scope that can be implemented. The change or adjustment of its relative relationship should also be regarded as the scope that can be implemented in the utility model without substantially changing the technical content.

[0020] See also Figure 1 to Figure 2 A single-acting quick-retraction cylinder includes a cylinder body 1, a piston 2 and a piston rod 3 are arranged in the cylinder body 1, an air inlet 4 connected to the rod chamber is opened at the front end of the cylinder body 1, and an exhaust port connected to the rodless chamber is opened at the rear end. The front end of the piston rod 3 extends out of the cylinder body 1 and is connected to the rod head. In order to facilitate the maintenance and replacement of the seal after damage, the existing welding structure is changed to a disassembly structure, and the cylinder body 1 and the cylinder bottom 11 are connected by screw disassembly, which is convenient for disassembly and maintenance. The surface of the piston 2 adopts a grid ring hole seal and a wear-resistant lubricating coating, and the inner hole of the guide sleeve 5 adopts a grid ring hole seal and a wear-resistant lubricating coating, which can effectively resist wear.

[0021] A guide sleeve 5 is provided at the front end of the cylinder body 1, and a lubricating oil passage 6 is opened on the guide sleeve 5. The grease in the lubricating oil passage 6 flows to the surface of the piston rod 3. The grease can be used to lubricate the seal to effectively resist wear.

[0022] The end of the piston rod 3 is sleeved with a buffer plate 7, and the buffer plate 7 and the piston 2 are spaced apart. The end of the piston rod 3 is connected with a nut 8, and the nut 8 contacts the buffer plate 7 to position the buffer plate 7. The buffer plate 7 is fixed by the nut 8 to prevent the buffer plate 7 from falling off the piston rod 3. The cylinder bottom 11 at the rear end of the cylinder body 1 is provided with a groove body that cooperates with the nut 8. When the piston is retracted, the nut 8 enters the groove body. The depth of the groove body should be greater than the thickness of the nut 8 to prevent the nut 8 from colliding with the cylinder bottom 11 first.

[0023] A spring 9 is embedded in the buffer plate 7, and the other end of the spring 9 is in contact with the piston. An annular mounting cavity is provided inside the buffer plate 7, and a plurality of springs 9 are arranged in the annular mounting cavity. When the piston 2 is retracted, the buffer plate 7 first contacts the cylinder bottom 11 to achieve a buffering effect. At the same time, due to the effect of the spring 9, the impact force of the piston 2 is further offset by the elastic force of the spring 9, thereby preventing the piston 2 from hitting the cylinder bottom 11 at high speed.

[0024] A plurality of guide rings 10 are provided between the buffer plate 7 and the piston rod 3 , and the buffer plate 7 is supported by the guide rings 10 , thereby ensuring the stability of the buffer plate 7 and helping to improve the buffering effect.

[0025] The bottom 11 of the cylinder is provided with an exhaust port connected to the rodless chamber. The air pressure in the rodless chamber is quickly discharged into the atmosphere through the exhaust port, ensuring that there is no back pressure on the piston 2 before it enters the buffer distance, thus ensuring the retraction effect. The cylinder is fully extended in the initial state, and the air inlet 4 is connected to the high-pressure air source of the accumulator. The piston rod 3 retracts at high speed with load. A buffer is set at the end of the stroke, and a spring 9 is used to buffer the small chamber pressure and load kinetic energy. The gas in the rod chamber is directly discharged into the atmosphere. The aperture of the exhaust port is equivalent to the air intake volume of the air inlet 4, and there is no resistance to the movement of the piston rod 3 due to the back pressure of the stroke. The piston rod 3 is pulled out by external force during the extension of the piston rod 3.

[0026] Different from the prior art, the utility model single-acting fast-retracting cylinder can buffer the piston through a spring and a buffer plate to prevent the piston from hitting the cylinder bottom at high speed. It has a simple structure, good buffering effect, and reduces the machining accuracy requirements of the cylinder.

[0027] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A single-acting quick-retraction cylinder, comprising a cylinder body (1), wherein a piston (2) and a piston rod (3) are arranged in the cylinder body (1), wherein the front end of the cylinder body (1) is provided with an air inlet (4) communicating with a rod chamber, and the rear end of the cylinder body (1) is provided with an air outlet communicating with a rodless chamber, wherein: The end of the piston rod (3) is sleeved with a buffer plate (7), the buffer plate (7) and the piston (2) are spaced apart, a spring (9) is embedded in the buffer plate (7), and the other end of the spring (9) is in contact with the piston (2).

2. The single-acting quick-retraction cylinder according to claim 1, characterized in that: An annular mounting cavity is provided on the inner side of the buffer plate (7), and a plurality of springs (9) are arranged in the annular mounting cavity.

3. The single-acting quick-retraction cylinder according to claim 2, characterized in that: A plurality of guide rings (10) are arranged between the buffer plate (7) and the piston rod (3).

4. The single-acting fast-retracting cylinder according to claim 1, characterized in that: A nut (8) is connected to the end of the piston rod (3), and the nut (8) is in contact with the buffer plate (7) to position the buffer plate (7).

5. The single-acting quick-retraction cylinder according to claim 4, characterized in that: The cylinder bottom (11) at the rear end of the cylinder body (1) is provided with a groove body that cooperates with the nut (8).

6. The single-acting fast-retracting cylinder according to claim 5, characterized in that: The cylinder body (1) and the cylinder bottom (11) are detachably connected via screws.

7. The single-acting fast-retracting cylinder according to claim 6, characterized in that: The cylinder bottom (11) is provided with an exhaust port connected to the rodless chamber.

8. The single-acting fast-retracting cylinder according to any one of claims 1 to 7, characterized in that: A guide sleeve (5) is provided at the front end of the cylinder body (1), and a lubricating oil passage (6) is provided on the guide sleeve (5). Lubricating grease in the lubricating oil passage (6) flows to the surface of the piston rod (3).

Images