Rack piston structure and rotating cylinder

Abstract

The utility model discloses a rack piston structure and a rotary cylinder, the rack piston structure comprises a piston main body, the piston main body is provided with a rack and two piston end parts, the rack is arranged on one side of the piston main body in an extending manner along the axial direction of the piston main body, and the two ends of the rack extend to be connected with the two piston end parts; and the guide supporting structure is located between the two piston ends and installed on the other side of the piston body relative to the rack, and the piston body can be supported on the inner wall face of the cylinder body through the guide supporting structure. According to the rack piston structure, the installation space of the guide supporting structure does not need to be provided by increasing the length of the piston body, the two ends of the rack can extend to be connected with the ends of the two pistons, and therefore under the condition that the lengths of the racks are the same, the rack piston structure has the shorter length, and the service life of the rack piston structure is prolonged under the condition that the strokes are the same. The rotary air cylinder provided by the utility model has a shorter length.

Description

Technical Field

[0001] The utility model relates to the technical field of piston cylinders, and in particular to a rack piston structure and a rotary cylinder. Background Art

[0002] The piston cylinder mainly consists of a cylinder body and a piston structure. A guide ring is provided on the piston structure. The guide ring mainly serves as support and guidance. It can prevent the piston structure from direct contact and friction with the cylinder body during movement, thereby protecting the cylinder body and the piston structure from damage and avoiding failure of the piston cylinder.

[0003] like Figure 1 As shown, the piston structure of a part of the piston cylinder is a rack piston structure 1' provided with a rack 3', such as a rotary cylinder, which is connected to the gear transmission structure by the rack 3' to convert the linear motion of the rack piston structure 1' into the rotational motion of the gear transmission structure. In the prior art, in order to realize the setting of the guide ring 4', it is necessary to extend the rack piston structure 1', so that there is an installation space for the guide ring 4' between the two piston ends 2' of the rack piston structure 1' and the rack 3'. However, this setting will cause the overall length of the rack piston structure 1' to increase. In particular, for a piston cylinder with a short stroke, the overall length of the rack piston structure 1' is significantly increased, and the overall length of the cylinder body also needs to be increased accordingly, which is not conducive to the size compression of the product. Utility Model Content

[0004] The purpose of the utility model is to provide a rack piston structure and a rotary cylinder to solve the technical problem that the rack piston structure of the prior art increases the overall length of the piston structure due to the provision of a guide structure, which is not conducive to the size compression of the product.

[0005] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] The utility model provides a rack piston structure, comprising: a piston main body, having a rack and two piston end portions, wherein the rack is arranged on one side of the piston main body along the axial extension of the piston main body, and the two ends of the rack extend to be connected to the two piston end portions; at least one guide support structure, located between the two piston end portions and installed on the other side of the piston main body relative to the rack, and the piston main body can be supported on the inner wall surface of the cylinder body through the guide support structure.

[0007] In an embodiment of the present invention, the guide support structure has a guide support surface, which can be fitted and supported on the inner wall surface of the cylinder body. The guide support surface is extended along the circumference of the piston body, and the rack is located between the two ends of the guide support surface in the circumference of the piston body.

[0008] In the embodiment of the utility model, the guiding and supporting surface is a circular arc surface, and the radius of the guiding and supporting surface is greater than the radius of the piston body.

[0009] In the embodiment of the utility model, the cross section of the guiding and supporting surface is a semicircle.

[0010] In the embodiment of the utility model, the guiding and supporting structure comprises a guiding and supporting block or a guiding and supporting notch ring, and the piston body is provided with a mounting groove for mounting the guiding and supporting block or the guiding and supporting notch ring.

[0011] In the embodiment of the utility model, a matching positioning connecting boss and a positioning connecting groove are arranged between the groove bottom surface of the mounting groove and the guiding and supporting block or the guiding and supporting notch ring.

[0012] In the embodiment of the utility model, the number of the guiding and supporting structures is two, and the two guiding and supporting structures are arranged close to or connected with the two piston end portions.

[0013] In the embodiment of the utility model, the piston end portion is provided with a piston sealing ring, and the piston sealing ring is used for sealing sliding cooperation with the inner wall surface of the cylinder body along the axial direction of the piston body.

[0014] The utility model also provides a rotary air cylinder which comprises two above-mentioned rack piston structures, and the rotary air cylinder further comprises a cylinder body and a gear transmission structure, the cylinder body has two driving chambers, the two rack piston structures are installed in the two driving chambers, and the transmission gear of the gear transmission structure is installed in the cylinder body and is in meshing connection with the racks of the two rack piston structures.

[0015] In the embodiment of the utility model, the rotary air cylinder further comprises two adjusting screw structures, the two adjusting screw structures are in screw connection with the cylinder body and can be screwed into the two driving chambers along the axial direction of the rack piston structure.

[0016] The utility model has the characteristics and advantages that:

[0017] The rack piston structure and the rotary air cylinder of the utility model realize guiding and supporting through the guiding and supporting structure, avoid interference between the guiding and supporting structure and the rack, do not need to increase the length of the piston body to provide the mounting space of the guiding and supporting structure, the two ends of the rack can be extended to be connected with the two piston end portions, the rack piston structure of the utility model has a shorter length under the condition that the length of the rack is same, and the rotary air cylinder of the utility model has a shorter length under the condition that the stroke is same. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of a piston structure equipped with a guide ring in the prior art.

[0020] Figure 2 This is a structural diagram of the rack piston structure in one embodiment of the present utility model.

[0021] Figure 3 It is a longitudinal cross-sectional schematic diagram of the rotary cylinder in the present utility model.

[0022] Figure 4 It is a transverse cross-sectional schematic diagram of the rotary cylinder in the present utility model.

[0023] Figure 5 This is a three-dimensional diagram of the appearance of the rotary cylinder in the present invention.

[0024] In the picture:

[0025] 1. Rack piston structure; 101. First rack piston structure; 102. Second rack piston structure; 11. Piston body; 111. Rack; 112. Piston end; 113. Mounting groove; 114. Positioning and connecting boss; 12. Guide support structure; 121. Guide support surface; 122. Guide support block; 123. Positioning and connecting groove; 13. Magnet; 14. Piston sealing ring;

[0026] 2. Cylinder body; 21. Drive chamber; 211. First air cavity; 212. Second air cavity; 22. First air inlet; 23. Second air inlet;

[0027] 3. Gear transmission structure; 31. Transmission gear; 32. Transmission shaft;

[0028] 4. Adjust the screw structure;

[0029] 5. Rotary output structure; 51. Bolt;

[0030] 61. Upper bearing; 62. Lower bearing. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Implementation Method 1

[0033] like Figure 2 and Figure 3 As shown, the utility model provides a rack piston structure 1, comprising: a piston body 11, having a rack 111 and two piston ends 112, the rack 111 extending along the axial direction of the piston body 11 and arranged on one side of the piston body 11, and the two ends of the rack 111 extend to connect with the two piston ends 112; at least one guide support structure 12, located between the two piston ends 112 and installed on the other side of the piston body 11 relative to the rack 111, the piston body 11 can be supported on the inner wall surface of the cylinder body 2 through the guide support structure 12, that is, the guide support structure 12 is supported on the inner wall surface of the cylinder body 2 and supports the piston body 11.

[0034] The rack piston structure 1 of the present invention, by installing the guide support structure 12 on the other side of the piston body 11 relative to the rack 111, can avoid interference between the guide support structure 12 and the rack 111 while utilizing the guide support structure 12 to achieve guide support. There is no need to increase the length of the piston body 11 to provide installation space for the guide support structure 12, so that both ends of the rack 111 can extend to connect with the two piston ends 112. Therefore, when the length of the rack 111 is the same, the overall length of the rack piston structure 1 of the present invention is shorter. In addition, compared with the guide ring, the contact area between the guide support structure 12 and the inner wall surface of the cylinder body 2 in the present invention is reduced, thereby reducing the friction force that the rack piston structure 1 needs to overcome and lowering the starting pressure.

[0035] The rack piston structure 1 of the present invention is particularly suitable for use in a rotary cylinder, and can shorten the length of the rotary cylinder under the condition of the same stroke.

[0036] Specifically, the piston end 112 is provided with a piston sealing ring 14, and the piston body 11 is sealed and slidably matched with the inner wall surface of the cylinder body 2 through the piston sealing ring 14. The material of the guide support structure 12 can be the same as the material of the guide ring in the prior art, with a lower friction coefficient and better wear resistance. The number of guide support structures 12 is preferably set to two, and the two guide support structures 12 are preferably arranged close to the two piston ends 112 or connected to the two piston ends 112, so that the piston body 11 is supported more stably by the two guide support structures 12. In addition, in an embodiment of the present invention, a magnet 13 is also provided on the piston body 11, and the magnet 13 is located between the two guide support structures 12, preferably located in the middle position of the piston body 11. The magnet 13 is used to cooperate with the position sensor to realize the position feedback of the piston body 11. The working principle and beneficial effects involved are the same as those in the prior art and are not described in detail here.

[0037] Of course, when the length of the piston body 11 is relatively short, only one guide support structure 12 may be provided, preferably located in the middle position of the piston body 11; when the length of the piston body 11 is relatively long, more guide support structures 12 may be provided, but it should be avoided that the number of guide support structures 12 increases too much, which may cause the rack piston structure 1 to have too much friction to overcome when moving.

[0038] like Figure 2 and Figure 3 As shown, in the embodiment of the present invention, the guide support structure 12 has a guide support surface 121, which can be fitted and supported on the inner wall surface of the cylinder body 2, and the guide support surface 121 is extended along the circumference of the piston body 11, and the rack 111 is located between the two ends of the guide support surface 121 in the circumferential direction of the piston body 11, that is, the guide support surface 121 does not extend a circle along the circumference of the piston body 11, so that the two ends of the guide support surface 121 can avoid the rack 111.

[0039] Specifically, a drive chamber 21 is provided within the cylinder body 2. The rack piston structure 1 is sealed and slidably disposed within the drive chamber 21 via a piston seal ring 14 at the piston end 112, and is supported by the guide support structure 12. The piston body 11 is generally cylindrical, and the drive chamber 21 is generally a cylindrical chamber. The guide support surface 121 is an arc surface, equivalent to a cylindrical surface with a notch. The radius of the guide support surface 121 is greater than the radius of the piston body 11, while the radius of the guide support surface 121 is similar to that of the drive chamber 21, thereby being closely supported by the inner wall surface of the drive chamber 21, with a gap between the piston body 11 and the inner wall surface of the drive chamber 21.

[0040] Among them, combined Figure 2As shown, the curvature of the guide support surface 121 extending along the circumference of the piston body 11 can be designed as required, which is not specifically limited herein, but it should be noted that the greater the curvature of the guide support surface 121, the greater the area of the guide support surface 121 supported by the inner wall surface of the cylinder body 2, the more stable the support, but the smaller the maximum allowable design width of the rack 111; the smaller the curvature of the guide support surface 121, the greater the maximum allowable design width of the rack 111, the more stable the meshing connection of the rack 111 and the transmission gear 31 of the gear transmission structure 3, but the smaller the area of the guide support surface 121 supported by the inner wall surface of the cylinder body 2.

[0041] As shown in the drawings, Figure 2 In the embodiments of the utility model, the cross section of the guide support surface 121 is semicircular, that is, the curvature of the guide support surface 121 extending along the circumference of the piston body 11 is 180 degrees, which can not only ensure that the guide support structure 12 can stably support the piston body 11, but also ensure that the rack 111 has sufficient width to stably mesh with the transmission gear 31 of the gear transmission structure 3.

[0042] As shown in the drawings, Figure 2 In some embodiments of the utility model, the guide support structure 12 includes a guide support block 122, and the piston body 11 is provided with a mounting groove 113 for mounting the guide support block 122. The groove bottom surface of the mounting groove 113 is provided with a positioning connection boss 114, and the guide support block 122 is provided with a positioning connection groove 123 matched with the positioning connection boss 114. By matching the guide support block 122 with the mounting groove 113, the guide support block 122 has good support strength, and the piston body 11 can reduce its weight and cost by opening the mounting groove 113.

[0043] The connection mode of the positioning connection boss 114 and the positioning connection groove 123 is not specifically limited, for example, interference fit or clamping fit. The guide support block 122 is generally a sector-shaped cylindrical structure, and the sector-shaped cylindrical surface constitutes the guide support surface 121. In a specific embodiment, the guide support block 122 is generally a semicircular cylindrical shape, and the semicircular cylindrical surface constitutes the guide support surface 121.

[0044] As shown in the drawings, Figure 2 In other embodiments of the utility model, the guide support structure 12 includes a guide support notch ring, and the mounting mode of the guide support notch ring can be the same as that of the guide support block 122, and the difference lies in that the positioning connection groove 123 is preferably arranged on the groove bottom surface of the mounting groove 113, and the positioning connection boss 114 is arranged on the inner ring surface of the guide support notch ring, and the outer ring surface of the guide support notch ring constitutes the guide support surface 121. In a specific embodiment, the guide support notch ring is generally a semicircular structure.

[0045] Embodiment two

[0046] like Figure 3 、 Figure 4 as well as Figure 5 As shown, the present invention further provides a rotary cylinder comprising two rack piston structures 1. The specific structure, working principle and beneficial effects of the rack piston structure 1 in this embodiment are the same and will not be described in detail here.

[0047] In addition, the rotary cylinder also includes a cylinder body 2 and a gear transmission structure 3. The cylinder body 2 has two drive chambers 21, and the two rack piston structures 1 are installed in the two drive chambers 21. The transmission gear 31 of the gear transmission structure 3 is installed in the cylinder body 2 and is meshed with the racks 111 of the two rack piston structures 1.

[0048] Specifically, the gear transmission structure 3 also includes a transmission shaft 32, through which the transmission gear 31 is mounted to the cylinder body 2. The transmission gear 31 can be integrally formed on the transmission shaft 32 to form a gear shaft structure, or it can be assembled on the transmission shaft 32. The lower end of the transmission shaft 32 is rotationally connected to the cylinder body 2 via a lower bearing 62, and the upper end of the transmission shaft 32 is rotationally connected to the cylinder body 2 via an upper bearing 61. The rotary cylinder also includes a rotary output structure 5, which is rotatably mounted on a surface of the cylinder body 2 via an upper bearing 61 and connected to the upper end of the transmission shaft 32. The rotary output structure 5 is connected to other mechanisms, thereby outputting the rotary motion to the other mechanisms. The rotary output structure 5 is generally a connecting flange, which is connected to the upper end of the transmission shaft 32 via bolts 51.

[0049] like Figure 3 As shown, the two drive chambers 21 are divided into a first air chamber 211 and a second air chamber 212 by the corresponding rack piston structure 1, and the two first air chambers 211 and the two second air chambers 212 of the two drive chambers 21 are arranged crosswise. The cylinder body 2 is also provided with a first air inlet 22, a second air inlet 23, a first air path, and a second air path. The first air inlet 22 is connected to one first air chamber 211 and is connected to the other first air chamber 211 through the first air path. The second air inlet 23 is connected to one second air chamber 212 and is connected to the other second air chamber 212 through the second air path. When the driving gas flows from the first air inlet 22 into the two first air chambers 211, it can drive the two rack piston structures 1 to move toward the corresponding second air chamber 212, thereby driving the transmission gear 31 to rotate in one direction. When the driving gas flows from the second air inlet 23 into the two second air chambers 212, it can drive the two rack piston structures 1 to move toward the corresponding first air chamber 211, thereby driving the transmission gear 31 to rotate in the other direction.

[0050] like Figure 3 As shown, in this embodiment, the two rack piston structures 1 are defined as a first rack piston structure 101 and a second rack piston structure 102. Figure 3 As shown in the view angle, a first air cavity 211 is located at the left side of the first rack piston structure 101, another first air cavity 211 is located at the right side of the second rack piston structure 102, a second air cavity 212 is located at the right side of the first rack piston structure 101, and another second air cavity 212 is located at the left side of the second rack piston structure 102, when the driving gas flows into the two first air cavities 211 from the first air inlet 22, the first rack piston structure 101 can be driven to move to the right, and the second rack piston structure 102 moves to the left, thereby driving the transmission gear 31 to rotate clockwise; when the driving gas flows into the two second air cavities 212 from the second air inlet 23, the first rack piston structure 101 can be driven to move to the left, and the second rack piston structure 102 moves to the right, thereby driving the transmission gear 31 to rotate counterclockwise.

[0051] In addition, as shown in Figure 3 and Figure 5 To achieve the adjustment of the rotation angle range, in the embodiment of the utility model, the rotary cylinder further comprises two adjusting screw structures 4, the two adjusting screw structures 4 are threadedly connected with the cylinder body 2 and can be screwed into the two driving chambers 21 along the axial direction of the rack piston structure 1, when the movable rack piston structure 1 moves to the direction close to the adjusting screw structure 4 and abuts against the adjusting screw structure 4, the rack piston structure 1 can be limited to continue moving in the direction by the adjusting screw. Therefore, by rotating the adjusting screw structure 4, the length of the two adjusting screw structures 4 screwed into the driving chamber 21 can be adjusted, thereby the stroke of the linear movement of the two rack piston structures 1 can be changed, and the adjustment of the rotation angle range of the transmission gear 31 can be realized.

[0052] The above only describes several embodiments of the utility model, and those skilled in the art can make various modifications or changes to the embodiments of the utility model according to the disclosed content of the application file without departing from the spirit and scope of the utility model.

Claims

1. A rack piston structure, characterized in that: include: The piston body (11) has a rack (111) and two piston ends (112), wherein the rack (111) is arranged on one side of the piston body (11) along the axial direction of the piston body (11), and both ends of the rack (111) extend to connect with the two piston ends (112); At least one guide support structure (12) is located between the two piston ends (112) and is installed on the other side of the piston body (11) relative to the rack (111). The piston body (11) can be supported on the inner wall surface of the cylinder body (2) through the guide support structure (12).

2. The rack piston structure according to claim 1, characterized in that: The guide support structure (12) has a guide support surface (121), and the guide support surface (121) can be supported in contact with the inner wall surface of the cylinder body (2). The guide support surface (121) is extended along the circumference of the piston body (11), and the rack (111) is located between the two ends of the guide support surface (121) in the circumference of the piston body (11).

3. The rack piston structure according to claim 2, characterized in that: The guide support surface (121) is an arc surface, and the radius of the guide support surface (121) is greater than the radius of the piston body (11).

4. The rack piston structure according to claim 3, characterized in that: The cross section of the guide support surface (121) is semicircular.

5. The rack piston structure according to any one of claims 1 to 4, characterized in that: The guide support structure (12) includes a guide support block (122) or a guide support gap ring, and the piston body (11) is provided with a mounting groove (113) for mounting the guide support block (122) or the guide support gap ring.

6. The rack piston structure according to claim 5, characterized in that: Matching positioning connection bosses (114) and positioning connection grooves (123) are provided between the bottom surface of the installation groove (113) and the guide support block (122) or the guide support notch ring.

7. The rack piston structure according to claim 1, wherein: The number of the guide support structures (12) is two, and the two guide support structures (12) are arranged close to the two piston ends (112) or connected to the two piston ends (112).

8. The rack piston structure according to claim 1, wherein: The piston end (112) is sleeved with a piston sealing ring (14), and the piston sealing ring (14) is used for sealing and slidingly fitting with the inner wall surface of the cylinder body (2) along the axial direction of the piston body (11).

9. A rotary cylinder, characterized in that: Comprising two rack piston structures (1) according to any one of claims 1 to 8; The rotary cylinder further comprises a cylinder body (2) and a gear transmission structure (3), wherein the cylinder body (2) has two driving chambers (21), the two rack piston structures (1) are installed in the two driving chambers (21), and the transmission gear (31) of the gear transmission structure (3) is installed in the cylinder body (2) and meshedly connected with the racks (111) of the two rack piston structures (1).

10. The rotary cylinder according to claim 9, wherein: The rotary cylinder further comprises two adjusting screw structures (4), which are threadedly connected to the cylinder body (2) and can be screwed into the two driving chambers (21) along the axial direction of the rack piston structure (1).

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