Impact cylinder

Abstract

The utility model relates to an impact air cylinder, which belongs to the technical field of impact air cylinders and comprises a cylinder barrel body, a closed cavity is formed in the cylinder barrel body, a long cylinder barrel, a locking barrel, a guide sleeve and a short cylinder barrel are arranged in the closed cavity along the axial direction of the long cylinder barrel, and a piston rod is coaxially arranged in the long cylinder barrel and the locking barrel. One end of the piston rod penetrates out of the wall of the closed cavity, the locking barrel is used for limiting the movement stroke of the piston rod towards the energy storage cavity, the part, located in the closed cavity, of the piston rod is in contact and sliding connection with the long cylinder barrel and the locking barrel, and the energy storage cavity is formed in the short cylinder barrel; the end, close to the guide sleeve, of the piston rod protrudes to form an extending part which is in contact and sliding connection with the inner wall of the guide sleeve.

Description

Technical Field

[0001] The utility model belongs to the technical field of impact cylinders, and in particular relates to an impact cylinder. Background Art

[0002] The impact cylinder is a device that can accumulate energy and repeatedly output impact force in an instant, playing an important role in stamping and other fields.

[0003] The specific principle of a general impact cylinder is to set up a closed cavity, in which a long cylinder, a locking cylinder, a guide sleeve and a short cylinder are arranged along the axial direction of the closed cavity, and a piston rod is coaxially arranged in the long cylinder and the locking cylinder, and one end of the piston rod passes through the wall of the closed cavity, and the short cylinder is the end of the closed cavity away from the piston rod. The short cylinder is used to act as an energy storage cavity, and a guide sleeve is arranged between the energy storage cavity and the locking cylinder. The part of the piston rod located in the closed cavity is in contact and sliding connection with the long cylinder and the locking cylinder, and the locking cylinder is used to limit the movement stroke of the piston rod toward the energy storage cavity. The inflation module continuously inflates the energy storage cavity. When the air pressure is high, the air pressure exerts a tendency on the piston rod to extend outward. At this time, the part of the closed cavity that is frictionally connected with the piston rod provides friction for the piston rod, so that the piston rod maintains its original position. When the gas pressure in the energy storage cavity is too high, the high-pressure gas pushes the piston rod to extend at high speed to complete the impact action.

[0004] In the above process, the final impact force of the impact cylinder depends on the friction between the piston rod and the inner wall of the cavity when the piston rod is extended. The greater the friction, the greater the pressure of the energy storage chamber that the piston rod and the cavity can withstand. When the piston rod is finally driven, the driving force is also greater. However, the part of the general piston rod located in the closed cavity only extends to a part of the locking cylinder, resulting in a limited connection area between the piston rod and the locking cylinder, limited friction, and insufficient impact force. For this reason, an impact cylinder with a larger contact area between the piston rod and the inner wall of the closed cavity is needed. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides an impact cylinder having the characteristic of a larger contact area between the piston rod and the inner wall of the closed cavity.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] An impact cylinder, comprising a cylinder body, the cylinder body forming a closed cavity, the closed cavity including a long cylinder, a locking cylinder, a guide sleeve and a short cylinder along its own axial direction, a piston rod is coaxially arranged in the long cylinder and the locking cylinder, one end of the piston rod passes through the closed cavity wall, the locking cylinder is used to limit the movement stroke of the piston rod toward an energy storage cavity, the part of the piston rod located in the closed cavity is in contact and sliding connection with the long cylinder and the locking cylinder, and the energy storage cavity is arranged in the short cylinder;

[0008] An extension portion is formed on one end of the piston rod close to the guide sleeve, and the extension portion is in contact and sliding connection with the inner wall of the guide sleeve.

[0009] As a preferred technical solution of the utility model, the edge of the extension portion away from the end of the piston rod is provided with a chamfer, and the chamfer makes the diameter of the extension portion away from the end of the piston rod gradually converge.

[0010] As a preferred technical solution of the utility model, the cross section of the chamfer is a triangle, and the chamfer and the extension portion have a smooth transition.

[0011] As a preferred technical solution of the utility model, a buffer sealing ring is provided at the contact portion between the inner wall of the guide sleeve and the extension portion.

[0012] As a preferred technical solution of the utility model, the buffer sealing ring is a nitrile rubber ring.

[0013] As a preferred technical solution of the utility model, the cylinder body is provided with fixing bolts at both ends along its axial direction.

[0014] As a preferred technical solution of the utility model, a protruding shaft is formed at one end of the piston rod near the middle end cover, the protruding shaft is in the middle end cover hole, a buffer sealing ring is arranged between the protruding shaft and the middle end cover hole, and the buffer sealing ring is used to seal the gap between the protruding shaft and the middle end cover hole.

[0015] The beneficial effects of the utility model are:

[0016] (1) The extension portion provided on the inner wall of the guide sleeve increases the contact area between the piston rod and the closed cavity, thereby increasing the friction force of the piston rod and thereby increasing the impact force of the piston rod during movement;

[0017] (2) By providing a chamfer at the end of the extension away from the piston rod, the diameter of the end of the extension away from the piston rod becomes smaller and the edge is smoother, so that each time the end of the extension away from the piston rod passes through the buffer sealing ring on the inner wall of the guide sleeve, the buffer sealing ring will not be affected, and the contact area and friction between the piston rod and the closed cavity will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0020] Description of main component symbols:

[0021] In the figure: 1. Cylinder body; 2. Sealed cavity; 21. Long cylinder; 22. Locking cylinder; 23. Guide sleeve; 24. Short cylinder; 3. Piston rod; 31. Chamfer. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0023] See also Figure 1 , an impact cylinder, comprising a cylinder body 1, the cylinder body 1 is formed with a closed cavity 2, the closed cavity 2 includes a long cylinder 21, a locking cylinder 22, a guide sleeve 23 and a short cylinder 24 along its own axial direction, a piston rod 3 is coaxially arranged in the long cylinder 21 and the locking cylinder 22, one end of the piston rod 3 passes through the wall of the closed cavity 2, the locking cylinder 22 is used to limit the movement stroke of the piston rod 3 toward the energy storage cavity, the part of the piston rod 3 located in the closed cavity 2 is in contact and sliding connection with the long cylinder 21 and the locking cylinder 22, and the short cylinder 24 is provided with an energy storage cavity;

[0024] Specifically, the long cylinder 21 is a cylindrical cavity with a circular cross-section, and the piston rod 3 is also cylindrical. The outer diameter of the piston rod 3 is equal to the inner diameter of the long cylinder 21. One end of the piston rod 3 passes through the inner wall of the cylinder body 1, and the other end is gathered to form a plurality of steps. The portion of the piston rod 3 located in the locking cylinder 22 is slidably fitted with the inner wall of the locking cylinder 22, and the inner diameter of the locking cylinder 22 is smaller than that of the long cylinder 21, that is, the piston rod 3 has two sections, and the diameter of the portion located in the locking cylinder 22 is smaller than that of the portion located in the long cylinder 21; at the same time, the transition portion between the two portions of the piston rod 3 is formed with a plurality of steps consisting of frustums, and the transition portion between the long cylinder 21 and the locking cylinder 22 is also provided with a stepped inner wall in coordination with the plurality of steps, so that this portion of the piston rod 3 and the inner wall of the sleeve can fit together;

[0025] When in use, when the piston rod 3 moves toward the short cylinder 24 to form an upper limit, since the inner diameter of the long cylinder 21 is larger than the locking cylinder 22, the piston rod 3 will abut against the connection between the long cylinder 21 and the locking cylinder 22, preventing the piston rod 3 from further moving toward the short cylinder 24, thereby completing the locking function;

[0026] At the same time, the short cylinder 24 is used to act as an energy storage chamber, and the external gas source continuously inflates the energy storage chamber. When the gas pressure is high, the gas pressure exerts a tendency on the piston rod 3 to extend outward. At this time, the part where the inner wall of the long cylinder 21 and the locking cylinder 22 are connected to the piston rod 3 provides friction for the piston rod 3, so that the piston rod 3 maintains its original position. When the gas pressure in the energy storage chamber is too high, the high-pressure gas pushes the piston rod 3 to extend at a high speed to complete the impact action;

[0027] In the above structure, only the long cylinder 21 and the locking cylinder 22 are involved in the friction with the piston rod 3, the contact area is small, the friction force is limited, and the impact force is insufficient. In order to further increase the contact area between the piston rod 3 and the closed cavity 2, the piston rod 3 is protruded near the end of the guide sleeve 23 to form an extension portion, and the extension portion is in contact and sliding connection with the inner wall of the guide sleeve 23. Specifically, the extension portion is coaxially arranged with the piston rod 3 located in the locking cylinder 22 and is cylindrical in shape. The outer diameter of the extension portion is equal to the inner diameter of the guide sleeve 23. In this embodiment, the guide sleeve 23 is composed of a conical cavity close to the short cylinder 24 and a cylindrical cavity close to the locking cylinder 22. The conical convergence port is arranged toward the guide sleeve 23, and the extension portion is in contact and sliding connection with the inner wall of the guide sleeve 23. It is slidably connected with the cylindrical cavity part. When in use, since the bottom area of ​​the extension part close to the energy storage cavity is small, the force it receives is small. At this time, the energy storage cavity needs to further accumulate energy to enable the extension part and the piston rod 3 to overcome the friction and slide. At the same time, the extension part connected with the piston rod 3 is in contact with the inner wall of the guide sleeve 23, providing a larger contact area for the piston rod 3, further increasing the friction of the piston rod 3, and then increasing the impact force of the piston rod 3 when moving. Since the extension part itself has a certain length, it needs to move a distance away from the energy storage cavity before it can completely leave the short cylinder 24. During the movement, the energy storage cavity can further accumulate energy, further increasing the impact force of the piston rod 3.

[0028] Specifically, an extension portion is formed at one end of the piston rod 3 near the middle end cover, and the extension portion is inserted into the short cylinder 24. When the energy storage chamber is ventilated, the air pressure continues to rise. The convex shaft area is small, so when the pressure rises to a higher level, the friction force can be overcome and the piston rod 3 can move forward. At this time, it is equivalent to that the energy storage chamber has been inflated for a longer time before pushing the piston rod 3, and the energy of the air pressure can be fully accumulated.

[0029] At the same time, the protruding shaft is set to have a certain length, that is, the piston rod 3 has to move a certain distance away from the energy storage chamber before the protruding shaft completely leaves the hole in the middle end cover. This time delay further allows the air pressure in the energy storage chamber to accumulate. Therefore, by setting the protruding shaft, the air pressure energy in the energy storage chamber can be pushed out faster after further accumulation, so that the cylinder can form a stronger impact effect.

[0030] By providing the extension portion on the inner wall of the guide sleeve 23 , the contact area between the piston rod 3 and the closed cavity 2 is increased, the friction force of the piston rod 3 is increased, and thus the impact force of the piston rod 3 during movement is increased.

[0031] Specifically, in order to ensure that the air in the energy storage chamber in the short cylinder 24 does not leak outward from one end of the piston rod 3 before the piston rod 3 moves, so as to ensure that sufficient impact force is applied to the piston rod 3, a buffer seal ring is provided at the contact portion between the inner wall of the guide sleeve 23 and the extension portion. Specifically, an annular groove is dug in the inner wall of the guide sleeve 23, and the buffer seal ring is provided in the annular groove. The buffer seal ring slightly protrudes from the inner wall of the guide sleeve 23. When in use, the buffer seal ring protruding from the inner wall of the guide sleeve 23 abuts against the extension portion to complete the blocking of the air in the energy storage chamber.

[0032] Specifically, the buffer seal ring is an annular structure made of nitrile rubber.

[0033] Whenever the piston rod 3 rushes outward under the push of the energy storage chamber, the edge of the extension part away from the end of the piston rod 3 will scrape the energy storage sealing ring, which may cause damage to the energy storage sealing ring. To avoid such a situation, a chamfer 31 is provided on the edge of the extension part away from the end of the piston rod 3. The chamfer 31 makes the diameter of the extension part away from the end of the piston rod 3 gradually converge;

[0034] Specifically, the cross section of the chamfer 31 is triangular, and the chamfer 31 smoothly transitions with other parts of the extension. Whenever the extension passes through the buffer seal ring away from one end of the piston rod 3, the edge of the extension away from the end of the piston rod 3 will not contact the buffer seal ring due to the narrowing of the diameter after contraction. At the same time, since only the end is provided with the chamfer 31, the contact area between the main body of the extension and the guide sleeve 23 is less affected, thereby not affecting the contact area and friction between the piston rod 3 and the closed cavity 2.

[0035] By providing a chamfer 31 at the end of the extension away from the piston rod 3, the diameter of the end of the extension away from the piston rod 3 becomes smaller and the edge is smoother, so that each time the end of the extension away from the piston rod 3 passes through the buffer sealing ring on the inner wall of the guide sleeve 23, it will not affect the buffer sealing ring, and will not affect the contact area and friction between the piston rod 3 and the closed cavity 2.

[0036] In order to facilitate the fixing of the impact cylinder to the external equipment, the cylinder body 1 is provided with fixing bolts at both ends along its axial direction. The cylinder body 1 is cylindrical, and the fixing bolts are respectively arranged on the two bottom surfaces of the cylindrical cylinder body 1.

[0037] The working principle and use process of this utility model:

[0038] When in use, when the piston rod 3 moves toward the short cylinder 24 to form an upper limit, since the inner diameter of the long cylinder 21 is larger than the locking cylinder 22, the piston rod 3 will abut against the connection between the long cylinder 21 and the locking cylinder 22, preventing the piston rod 3 from further moving toward the short cylinder 24, thereby completing the locking function;

[0039] At the same time, the short cylinder 24 is used to act as an energy storage chamber, and an external gas source continuously inflates the energy storage chamber. When the air pressure is high, the air pressure exerts a tendency on the piston rod 3 to extend outward. At this time, the long cylinder 21, the locking cylinder 22 and the inner wall of the guide sleeve 23 that are slidably connected to the piston rod 3 provide friction for the piston rod 3, so that the piston rod 3 maintains its original position. When the gas pressure in the energy storage chamber is too high, the high-pressure gas pushes the piston rod 3 to extend at high speed to complete the impact action.

[0040] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An impact cylinder, characterized in that: It comprises a cylinder body, the cylinder body is formed with a closed cavity, the closed cavity includes a long cylinder, a locking cylinder, a guide sleeve and a short cylinder along its own axial direction, a piston rod is coaxially arranged in the long cylinder and the locking cylinder, one end of the piston rod passes through the closed cavity wall, the locking cylinder is used to limit the movement stroke of the piston rod toward the energy storage cavity, the part of the piston rod located in the closed cavity is in contact and sliding connection with the long cylinder and the locking cylinder, and the energy storage cavity is arranged in the short cylinder; An extension portion is formed on one end of the piston rod close to the guide sleeve, and the extension portion is in contact and sliding connection with the inner wall of the guide sleeve.

2. An impact cylinder according to claim 1, characterized in that: The edge of the extension portion away from the piston rod is provided with a chamfer, and the chamfer makes the diameter of the extension portion away from the piston rod gradually converge.

3. An impact cylinder according to claim 2, characterized in that: The cross section of the chamfer is triangular, and the chamfer and the extension portion have a smooth transition.

4. The impact cylinder according to claim 1, characterized in that: A buffer sealing ring is arranged at the contact portion between the inner wall of the guide sleeve and the extension portion.

5. An impact cylinder according to claim 4, characterized in that: The buffer seal ring is a nitrile rubber ring.

6. The impact cylinder according to claim 1, characterized in that: The cylinder body is provided with fixing bolts at both ends along its axial direction.

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