Mini air cylinder

Abstract

A mini air cylinder comprises a cylinder body, a piston, a piston rod, a front end cover and a rear end cover, a first air port is formed in the side wall of the front end cover in a penetrating mode and communicated with a through hole in the center of the front end cover, a second air port is formed in the side wall of the rear end cover in a penetrating mode and communicated with a blind hole in the center of the rear end cover, and installation protruding rings are arranged in the middles of the upper end face and the lower end face of the piston. A deformation part with a preset thickness is arranged on the peripheral wall surface of the outer end of the mounting convex ring, an avoiding ring groove is formed in the corresponding position of the piston rod, the wall surface, corresponding to one side of the deformation part, of the avoiding ring groove is set as a mounting inclined surface with a preset inclination angle, and the deformation part is riveted to the mounting inclined surface under the action of an external tool, so that the piston is fixedly connected with the piston rod; and annular buffer pads are further installed on the portions, below the deformation parts, of the installation protruding rings, and a positioning ring groove is further formed in the position, above the receding ring groove in the upper side, of the piston rod. According to the utility model, the integral structural design is reasonable, the service life is longer, and meanwhile, the noise in the operation process is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinders, in particular to a mini cylinder. Background Art

[0002] As a pneumatic component commonly used in the mechanical industry, the mini cylinder is well-known and common. It uses an air compressor as the power source and compressed air as the working medium to achieve energy transfer or signal transmission, thereby realizing various production controls and automatic controls. During operation, its piston abuts against the inner side wall of the cylinder barrel. During the reciprocating movement of the piston, if the coaxiality between the piston and the piston rod is poor, a large friction will be generated between the metal piston and the inner side wall of the cylinder barrel, resulting in a large noise when the mini cylinder operates. Content of the Utility Model

[0003] Aiming at the shortcomings of the above-mentioned existing technologies, the purpose of the utility model is to provide a mini cylinder to solve the problems raised in the above background art, and it has the advantage of reducing noise during operation.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows: A mini cylinder includes a cylinder body, a piston disposed in the cavity of the cylinder body, a piston rod fixedly connected to one end of the piston, a front end cover and a rear end cover for closing the front and rear end faces of the cylinder body. A first air port is disposed through the side wall of the front end cover and communicates with a through hole at the center of the front end cover. A second air port is disposed through the side wall of the rear end cover and communicates with a blind hole at the center of the rear end cover. Installation convex rings are provided in the middle of the upper and lower end faces of the piston. A deformation part with a predetermined thickness is provided on the outer peripheral wall surface of the installation convex ring. A relief ring groove is provided at the corresponding position of the piston rod. The wall surface of the relief ring groove on the side corresponding to the deformation part is an installation inclined surface with a predetermined inclination angle. The deformation part is riveted to the installation inclined surface under the action of an external tool to form a fixed connection between the piston and the piston rod. And annular buffer pads are respectively installed below the deformation part of the installation convex ring. A positioning ring groove is further provided above the relief ring groove on the upper side of the piston rod.

[0005] Advantages of adopting the above solution: By providing mounting convex rings with deformation parts on the upper and lower end faces of the piston, and providing relief ring grooves with mounting inclined surfaces at corresponding positions on the piston rod, after the piston is installed in place, the deformation parts are riveted and pressed to fit and fix with the mounting inclined surfaces through a riveting tool, so that the piston and the piston rod can be fixed. This setting can effectively ensure the coaxiality of the piston and the piston rod. The piston is not likely to move in position on the piston rod, and the synchronous movement effect of the piston and the piston rod is better. By providing two corresponding annular buffer pads, the deformation of the annular buffer pads is used to avoid rigid collisions between the piston and the front end cover and the rear end cover. The position fixation of the annular buffer pads is realized by the cooperation of the mounting convex rings and the deformation parts, and the installation and fixation of the annular buffer pads are also convenient. By providing positioning ring grooves to achieve the purpose of riveting and positioning. Therefore, the mini cylinder with the above structure has a reasonable overall structure design, a longer service life, and lower noise during operation.

[0006] Further, a first limiting ring platform surrounding the through hole is provided at the center of one side of the front end cover, a second limiting ring platform surrounding the blind hole is provided at the center of one side of the rear end cover, and the first limiting ring platform and the second limiting ring platform are respectively in sealing cooperation with the inner wall surfaces of the openings at both ends of the cylinder block.

[0007] In the above solution, by providing the first limiting ring platform and the second limiting ring platform, while playing the role of installing and fixing the front end cover and the rear end cover, it can also play a role in sealing and supporting the openings at both ends of the cylinder block, making the cylinder block not easily deformed and having a certain sealing effect. The structure design is reasonable and the use effect is good.

[0008] Further, a first ring groove is provided on the peripheral wall surface of the first limiting ring platform, a first sealing member is installed in the first ring groove, a second ring groove is provided at the root of the large diameter section of the through hole, a second sealing member is installed in the second ring groove, a third ring groove is provided on the peripheral wall surface of the second limiting ring platform, and a third sealing member is installed in the third ring groove.

[0009] In the above solution, the setting of the first sealing member can effectively ensure the sealing between the first limiting ring platform and the upper opening of the cylinder block. The setting of the second sealing member can effectively ensure the sealing between the piston rod and the through hole. The setting of the third sealing member can effectively ensure the sealing between the second limiting ring platform and the lower opening of the cylinder block. The structure design is reasonable and the mini cylinder has good sealing performance.

[0010] Further, at least two fourth ring grooves are provided on the peripheral wall surface of the piston rod opposite to the through hole of the piston, fourth sealing members are installed in the fourth ring grooves, and a fifth ring groove is further provided on the peripheral wall surface of the skirt of the piston, and a fifth sealing member is installed in the fifth ring groove.

[0011] In the above solution, the arrangement of multiple fourth seals can effectively ensure the sealed fit between the piston and the piston rod. The arrangement of the fifth seal can effectively ensure the sealed fit between the piston and the cavity of the cylinder block, making it difficult for the gas in the cavity to leak, and the movement of the piston and the piston rod is more stable and flexible.

[0012] Furthermore, a sixth ring groove is provided on the circumferential wall surface of the skirt of the piston above the fifth ring groove, and a magnetic ring is installed in the sixth ring groove, and the magnetic ring cooperates with an external magnetic control switch.

[0013] In the above solution, a magnetic ring is arranged in the sixth ring groove of the skirt of the piston. The magnetic ring will change its position as the piston rod and the piston move to control the on-off of the magnetic control switch, so as to achieve the purpose of precise positioning. Therefore, the ventilation of the corresponding air pipe can be controlled according to the position change to further reduce the impact force, thereby greatly improving the service life of the mini cylinder.

[0014] Furthermore, a first fixing nut is also connected to the top of the outer end of the piston rod, and a second fixing nut is connected to the fixing head on the other side of the front end cover.

[0015] In the above solution, the arrangement of the first fixing nut realizes the effective connection and fixation between the piston rod and the external carrier. The arrangement of the second fixing nut realizes the effective connection and fixation of the position of the mini cylinder. Description of the Drawings

[0016] Figure 1 is a cross-sectional view of the overall structure of the present invention;

[0017] Figure 2 is a schematic diagram of the structure of the piston rod of the present invention;

[0018] Figure 3 is a cross-sectional view of the structure of the piston of the present invention;

[0019] Figure 4 is a cross-sectional view of the structure of the rear end cover of the present invention;

[0020] Figure 5 is a cross-sectional view of the structure of the front end cover of the present invention.

[0021] In the figure: 1 - cylinder block, 2 - piston, 3 - piston rod, 4 - front end cover, 5 - rear end cover, 6 - first air port, 7 - second air port, 8 - mounting convex ring, 9 - deformation part, 10 - relief ring groove, 11 - mounting inclined surface, 12 - annular buffer pad, 13 - positioning ring groove, 14 - first limiting ring platform, 15 - second limiting ring platform, 16 - first ring groove, 17 - first seal, 18 - second ring groove, 19 - second seal, 20 - third ring groove, 21 - third seal, 22 - fourth ring groove, 23 - fourth seal, 24 - fifth ring groove, 25 - fifth seal, 26 - sixth ring groove, 27 - magnetic ring, 28 - first fixing nut, 29 - fixing head, 30 - second fixing nut. Detailed implementation manner

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention and / or the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other implementation manners can also be obtained. Additionally, the terms related to orientation only represent the relative positional relationship between components, rather than the absolute positional relationship.

[0023] Please refer to Figures 1 to 5As shown in the figure, a mini cylinder includes a cylinder block 1, a piston 2 disposed in the cavity of the cylinder block 1, a piston rod 3 fixedly connected to one end of the piston 2, a front end cover 4 and a rear end cover 5 for closing the front and rear end faces of the cylinder block 1. A first air port 6 is disposed through the side wall of the front end cover 4 and communicates with a through hole at the center of the front end cover 4. It should be noted that a large-diameter section is provided in the through hole, and the diameter of the large-diameter section is larger than the diameter of the piston rod 3. The first air port 6 penetrates through the large-diameter section of the through hole. A second air port 7 is disposed through the side wall of the rear end cover 5 and communicates with a blind hole at the center of the rear end cover 5. Installation convex rings 8 are provided in the middle of the upper and lower end faces of the piston 2. A deformation part 9 with a predetermined thickness is provided on the outer peripheral wall surface of the outer end of the installation convex ring 8. Among them, the diameter of the large-diameter section of the through hole and the diameter of the blind hole are both larger than the diameter of the deformation part 9. A relief ring groove 10 is provided at the corresponding position of the piston rod 3. The wall surface of the relief ring groove 10 on the side corresponding to the deformation part 9 is an installation inclined surface 11 with a predetermined inclination angle. The deformation part 9 is riveted onto the installation inclined surface 11 under the action of an external tool, so that the piston 2 and the piston rod 3 form a fixed connection. And annular buffer pads 12 are installed below the deformation part 9 of the installation convex ring 8. A positioning ring groove 13 is provided above the relief ring groove 10 on the upper side of the piston rod 3. By providing the installation convex rings 8 with deformation parts 9 on the upper and lower end faces of the piston 2, and providing the relief ring grooves 10 with installation inclined surfaces 11 at the corresponding positions of the piston rod 3, after the piston 2 is installed in place, through a riveting tool, the deformation part 9 is riveted to fit and fix with the installation inclined surface 11, and the piston 2 and the piston rod 3 can be fixed. The setting of this method can effectively ensure the coaxiality of the piston 2 and the piston rod 3. The piston 2 is not likely to move on the piston rod 3, and the synchronous movement effect of the piston 2 and the piston rod 3 is better. Also, by providing two corresponding annular buffer pads 12, the deformation of the annular buffer pads 12 is used to avoid the rigid collision between the piston 2 and the front end cover 4 and the rear end cover 5. And the position fixation of the annular buffer pads 12 is realized by the cooperation of the installation convex ring 8 and the deformation part 9. The installation and fixation of the annular buffer pads 12 are also convenient. Also, by providing the positioning ring groove 13, the purpose of riveting positioning is realized. Therefore, the mini cylinder with the above structure has a reasonable overall structure design, a longer service life, and lower noise during operation.

[0024] In this embodiment, a first limiting ring platform 14 surrounding the through hole is provided at the center of one side of the front end cover 4, and a second limiting ring platform 15 surrounding the blind hole is provided at the center of one side of the rear end cover 5. The first limiting ring platform 14 and the second limiting ring platform 15 are respectively in sealing cooperation with the inner wall surfaces of the openings at both ends of the cylinder block 1. By providing the first limiting ring platform 14 and the second limiting ring platform 15, while playing the role of installing and fixing the front end cover 4 and the rear end cover 5, it can also play a role in sealing and supporting the openings at both ends of the cylinder block 1, making the cylinder block 1 not easily deformed and having a certain sealing effect. The structure design is reasonable and the use effect is good.

[0025] In this embodiment, a first annular groove 16 is provided on the peripheral wall surface of the first limiting annular platform 14, a first sealing member 17 is installed in the first annular groove 16, a second annular groove 18 is provided at the root of the large-diameter section of the through hole, a second sealing member 19 is installed in the second annular groove 18, a third annular groove 20 is provided on the peripheral wall surface of the second limiting annular platform 15, and a third sealing member 21 is installed in the third annular groove 20. The setting of the first sealing member 17 can effectively ensure the seal between the first limiting annular platform 14 and the upper opening of the cylinder block 1. The setting of the second sealing member 19 can effectively ensure the seal between the piston rod 3 and the through hole. The setting of the third sealing member 21 can effectively ensure the seal between the second limiting annular platform 15 and the lower opening of the cylinder block 1. The structural design is reasonable, and the mini cylinder has good sealing performance.

[0026] In this embodiment, at least two fourth annular grooves 22 are provided on the peripheral wall surface of the piston rod 3 opposite to the through hole of the piston 2, fourth sealing members 23 are installed in the fourth annular grooves 22, a fifth annular groove 24 is further provided on the peripheral wall surface of the skirt of the piston 2, and a fifth sealing member 25 is installed in the fifth annular groove 24. The setting of the multiple fourth sealing members 23 can effectively ensure the sealed fit between the piston 2 and the piston rod 3. The setting of the fifth sealing member 25 can effectively ensure the sealed fit between the piston 2 and the cavity of the cylinder block 1, so that the gas in the cavity is not likely to leak, and the movements of the piston 2 and the piston rod 3 are more stable and flexible.

[0027] In this embodiment, a sixth annular groove 26 is provided on the peripheral wall surface of the skirt of the piston 2 above the fifth annular groove 24, a magnetic ring 27 is installed in the sixth annular groove 26, and the magnetic ring 27 cooperates with an external magnetic control switch. By arranging the magnetic ring 27 in the sixth annular groove 26 on the skirt of the piston 2, the position of the magnetic ring 27 changes as the piston rod 3 and the piston 2 move, so as to control the on-off of the magnetic control switch, thereby achieving the purpose of precise positioning. Therefore, it is possible to control whether the corresponding air pipe is ventilated according to the position change to further reduce the impact force, thus greatly improving the service life of the mini cylinder.

[0028] In this embodiment, a first fixing nut 28 is further connected to the top of the outer end of the piston rod 3, and a second fixing nut 30 is connected to the fixing head 29 on the other side of the front end cover 2.

[0029] In the above solution, the setting of the first fixing nut 28 realizes the effective connection and fixation between the piston rod 3 and the external carrier, and the setting of the second fixing nut 30 realizes the effective connection and fixation of the position of the mini cylinder.

[0030] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A mini cylinder, comprising a cylinder body (1), a piston (2) disposed in a cavity of the cylinder body (1), a piston rod (3) one end of which is connected and fixed to the piston (2), a front end cover (4) and a rear end cover (5) for sealing the front and rear end surfaces of the cylinder body (1), a first air port (6) penetrating through a side wall of the front end cover (4) and communicating with a through hole in the center of the front end cover (4), a second air port (7) penetrating through a side wall of the rear end cover (5) and communicating with a blind hole in the center of the rear end cover (5), characterized in that: The middle parts of the upper and lower end surfaces of the piston (2) are both provided with mounting convex rings (8), and the outer end peripheral wall surface of the mounting convex ring (8) is provided with a deformation portion (9) of a predetermined thickness. A corresponding position of the piston rod (3) is provided with an avoidance ring groove (10), and the avoidance ring groove (10) is provided with a mounting inclined surface (11) with a predetermined inclination angle on the wall surface corresponding to one side of the deformation portion (9). The deformation portion (9) is riveted onto the mounting inclined surface (11) under the action of an external tool so that the piston (2) and the piston rod (3) are fixedly connected, and an annular buffer pad (12) is also installed below the deformation portion (9) of the mounting convex ring (8), and a positioning ring groove (13) is also provided above the avoidance ring groove (10) on the upper side of the piston rod (3).

2. A mini cylinder according to claim 1, characterized in that: A first limiting ring (14) surrounding the through hole is provided at the center of one side of the front end cover (4), and a second limiting ring (15) surrounding the blind hole is provided at the center of one side of the rear end cover (5), and the first limiting ring (14) and the second limiting ring (15) are respectively sealed with the inner wall surfaces of the openings at both ends of the cylinder body (1).

3. A mini cylinder according to claim 2, characterized in that: A first annular groove (16) is provided on the peripheral wall surface of the first limiting ring platform (14), and a first sealing member (17) is installed in the first annular groove (16); a second annular groove (18) is provided at the root of the large diameter section of the through hole, and a second sealing member (19) is installed in the second annular groove (18); a third annular groove (20) is provided on the peripheral wall surface of the second limiting ring platform (15), and a third sealing member (21) is installed in the third annular groove (20).

4. The mini cylinder according to claim 1, characterized in that: At least two fourth annular grooves (22) are provided on the peripheral wall surface of the piston rod (3) relative to the through hole of the piston (2), and fourth sealing members (23) are installed in each of the fourth annular grooves (22). A fifth annular groove (24) is also provided on the peripheral wall surface of the skirt of the piston (2), and a fifth sealing member (25) is installed in the fifth annular groove (24).

5. The mini cylinder according to claim 4, characterized in that: A sixth ring groove (26) is provided on the peripheral wall surface of the skirt of the piston (2) above the fifth ring groove (24), and a magnetic ring (27) is installed in the sixth ring groove (26), and the magnetic ring (27) cooperates with an external magnetic control switch.

6. The mini cylinder according to claim 1, characterized in that: The top of the outer end of the piston rod (3) is also connected to a first fixing nut (28), and the front end cover (4) is connected to a second fixing nut (30) on the fixing head (29) on the other side.

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