Cylinder body end cover structure and rotary air cylinder

Abstract

The utility model discloses a cylinder body end cover structure and a rotating cylinder, the cylinder body end cover structure comprises a cylinder body, at least one driving chamber is arranged in the cylinder body, the cylinder body is also provided with at least one opening, and the opening is correspondingly communicated with the driving chamber; the at least one end cover blocks the opening, and the end cover is provided with a threaded hole used for being in threaded connection with the adjusting screw rod; wherein at least one anti-rotation structure is further arranged between the end cover and the inner wall face of the opening, and the anti-rotation structure comprises an anti-rotation groove and an anti-rotation piece which are matched in an inserted mode. While normal adjustment of the adjusting screw rod is achieved, the adjusting screw rod cannot drive the end cover to rotate when the adjusting screw rod rotates only by additionally arranging the anti-rotation piece and the anti-rotation groove which are matched on the existing cylinder body structure and the end cover, the structure is simple, the improvement cost is low, an independent air cylinder end cover does not need to be arranged, and the cost is low. The length of the cylinder is reduced; and the manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of piston cylinder technology, and in particular, to a cylinder end cap structure and a rotary cylinder. Background Technology

[0002] The piston cylinder mainly includes a cylinder body and a piston structure. The cylinder body has a drive chamber and two openings that are connected to the two ends of the drive chamber. The piston structure is installed in the drive chamber through one opening and is slidably fitted along the axial direction of the drive chamber. The two openings are sealed by end caps. By filling the drive chamber with a driving medium (such as high-pressure gas), the piston structure can be driven to move along the axial direction of the drive chamber. Therefore, the stroke of the piston structure is related to the axial length of the drive chamber.

[0003] In the prior art, in order to adjust the travel of the piston structure, an adjusting screw is installed by setting a threaded hole on one end cover. One end of the adjusting screw extends into the drive chamber. When the piston structure moves towards the adjusting screw and comes into contact with it, the piston structure is restricted from moving further in that direction. Therefore, by rotating the length of the adjusting screw extending into the drive chamber, the travel of the piston structure can be adjusted. However, when rotating the adjusting screw, the adjusting screw may cause the end cover to rotate synchronously and fail to move axially relative to the end cover along the drive chamber, thus failing to achieve the purpose of adjusting the travel of the piston structure.

[0004] In existing technologies, such as Figure 1 As shown, in order to solve the above problems, an independent end cap 2' is set and a threaded hole for installing the adjusting screw 3' is reserved. Then, the end cap 2' is sealed and fixed to one end of the cylinder body 1' to block the opening. However, on the one hand, it increases the mold opening cost of the end cap 2', and on the other hand, it increases the overall length L' of the piston cylinder. Utility Model Content

[0005] The purpose of this invention is to provide a cylinder end cap structure and a rotary cylinder to solve the technical problem that the piston structure cannot be adjusted when the end cap rotates with the adjusting screw without significantly increasing cost and length.

[0006] The above-mentioned objectives of this utility model can be achieved by the following technical solutions:

[0007] This utility model provides a cylinder end cap structure, comprising: a cylinder having at least one drive chamber inside, and the cylinder having at least one opening corresponding to and communicating with the drive chamber; at least one end cap sealing the opening, the end cap having a threaded hole for threaded connection with an adjusting screw; wherein, at least one anti-rotation structure is provided between the end cap and the inner wall surface of the opening, the anti-rotation structure comprising an anti-rotation groove and an anti-rotation component that fit together, one of which is provided on the end cap and the other on the inner wall surface of the opening.

[0008] In this embodiment of the utility model, the anti-rotation groove is provided on the inner wall surface of the opening, the cylinder body is also provided with an insertion port that communicates with the anti-rotation groove and the opening, one end of the anti-rotation member is connected to the end cap, and the other end of the anti-rotation member is inserted into the anti-rotation groove from the insertion port along the axial direction of the drive chamber.

[0009] In an embodiment of this utility model, an axial limiting structure is installed on the inner wall surface of the opening. The axial limiting structure can abut against the end cap to restrict the end cap from coming out of the opening and the anti-rotation component from coming out of the insertion port.

[0010] In an embodiment of this utility model, the axial limiting structure includes a retaining spring, and the inner wall surface of the opening is provided with an axial limiting groove along its circumference. The retaining spring is inserted into the axial limiting groove and abuts against the end cover along the axial direction of the driving chamber.

[0011] In an embodiment of this utility model, the anti-rotation groove has two anti-rotation limiting surfaces arranged opposite to each other in the tangential direction of the opening, and one end of the anti-rotation member abuts between the two anti-rotation limiting surfaces.

[0012] In this embodiment of the invention, the end cap is provided with a mounting hole or a mounting groove, and one end of the anti-rotation component is inserted into the mounting hole or the mounting groove.

[0013] In this embodiment of the invention, the anti-rotation component is a pin.

[0014] In this embodiment of the invention, a sealing ring is fitted on the end cap, and the sealing ring is in a sealed fit with the inner wall surface of the opening; the threaded hole extends axially along the drive chamber, and one end of the adjusting screw can pass through the threaded hole and extend into the drive chamber axially along the drive chamber.

[0015] This utility model also provides a rotary cylinder, including the above-mentioned cylinder body end cover structure. The number of the driving chambers of the cylinder body end cover structure and the number of the end covers are respectively set to two, and the two driving chambers are arranged in parallel. The rotary cylinder also includes a gear transmission structure, a two-piston structure and two adjusting screws. The two piston structures are installed in the two driving chambers. The transmission gear of the gear transmission structure is installed in the cylinder body and meshes with the rack of the two piston structures. The two adjusting screws are threadedly connected to the threaded holes of the two end covers and extend into the two driving chambers.

[0016] In this embodiment of the invention, a clamping nut and a sealing gasket are fitted on the adjusting screw. The clamping nut is threadedly connected to the adjusting screw and located outside the cylinder body. The sealing gasket is located between the end cap and the clamping nut. The clamping nut can press the sealing gasket tightly to seal the opening of the threaded hole.

[0017] The features and advantages of this utility model are:

[0018] The cylinder end cap structure and rotary cylinder of this utility model are connected by an anti-rotation structure between the end cap and the opening. The anti-rotation component is inserted into the anti-rotation groove, so that the end cap will not rotate when the adjusting screw is rotated. On the one hand, the adjusting screw can rotate relative to the end cap, thereby adjusting the stroke of the piston structure in the driving chamber by adjusting its length into the driving chamber. On the other hand, it can also prevent the end cap from rotating and affecting the sealing between the end cap and the opening. In addition, since this utility model can achieve the above-mentioned beneficial effects by simply adding matching anti-rotation components and anti-rotation grooves to the existing cylinder structure and end cap, the structure is simple, the improvement cost is low, and there is no need to set up a separate cylinder end cap for installing the adjusting screw, thereby reducing the cylinder length and reducing manufacturing costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the assembly of the separate end cap, cylinder body, and adjusting screw in the prior art.

[0021] Figure 2 This is a longitudinal sectional view of the cylinder end cap structure of this utility model applied to a rotary cylinder.

[0022] Figure 3 This is a partial disassembly diagram of the cylinder end cap structure in this utility model.

[0023] Figure 4 This is an enlarged view of the opening of the cylinder body in this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the end cap of this utility model.

[0025] Figure 6 This is a perspective view of the rotary cylinder in this utility model.

[0026] Figure 7 This is a cross-sectional view of the rotary cylinder in this utility model.

[0027] In the picture:

[0028] 1. Piston structure; 101. First piston structure; 102. Second piston structure; 11. Piston body; 111. Rack; 112. Piston end; 12. Magnet;

[0029] 2. Cylinder block end cap structure; 21. Cylinder block; 211. Drive chamber; 212. Opening; 213. Insertion port; 214. First air chamber; 215. Second air chamber; 22. End cap; 221. Threaded hole; 222. Sealing ring; 23. Anti-rotation structure; 231. Anti-rotation component; 232. Anti-rotation groove; 24. Axial limiting structure; 241. Snap ring; 242. Axial limiting groove;

[0030] 3. Adjusting screw; 31. Buffer; 32. Compression nut; 33. Sealing gasket;

[0031] 4. Gear transmission structure; 41. Transmission gear; 42. Transmission shaft;

[0032] 5. Rotary output structure; 51. Bolt;

[0033] 61. Upper bearing; 62. Lower bearing. Detailed Implementation

[0034] 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.

[0035] Implementation Method 1

[0036] like Figure 2 , Figure 3 as well as Figure 4As shown, this utility model provides a cylinder end cap structure 2, including: a cylinder 21, which has at least one drive chamber 211 inside, and the cylinder 21 also has at least one opening 212, which is correspondingly connected to the drive chamber 211; at least one end cap 22, which is sealed at the opening 212, and the end cap 22 has a threaded hole 221 for threaded connection with the adjusting screw 3; wherein, at least one anti-rotation structure 23 is provided between the end cap 22 and the opening 212, and the anti-rotation structure 23 includes an anti-rotation groove 232 and an anti-rotation member 231 that are inserted and matched.

[0037] The cylinder end cap structure 2 of this utility model is connected by an anti-rotation structure 23 between the end cap 22 and the opening 212. The anti-rotation component 231 is inserted into the anti-rotation groove 232, so that the end cap 22 will not be rotated when the adjusting screw 3 is rotated. On the one hand, the adjusting screw 3 can rotate relative to the end cap 22, so that the stroke of the piston structure 1 in the driving chamber 211 can be adjusted by adjusting the length of its extension into the driving chamber 211. On the other hand, it can also prevent the end cap 22 from rotating and affecting the sealing between the end cap 22 and the opening 212.

[0038] Furthermore, since the present invention can achieve the above-mentioned beneficial effects simply by adding a matching anti-rotation component 231 and anti-rotation groove 232 to the existing cylinder structure and end cover 22, the structure is simple, the improvement cost is low, and there is no need to set up an independent cylinder end cover for installing the adjusting screw 3, thereby reducing the cylinder length and manufacturing cost.

[0039] like Figure 2 As shown, in some embodiments of this utility model, the number of drive chambers 211 and end caps 22 are respectively set to two, and the two drive chambers 211 are arranged in parallel, so that it can be applied to rotary cylinders. The specific structure of the rotary cylinder is described in Embodiment 2, and will not be detailed here. In other embodiments of this utility model, the number of drive chambers 211 and end caps 22 is respectively set to one, which can be applied to other types of piston cylinders and can also produce the above-mentioned beneficial effects.

[0040] Specifically, the threaded hole 221 extends along the axial direction Z of the drive chamber 211, and one end of the adjusting screw 3 can pass through the threaded hole 221 and extend into the drive chamber 211 along the axial direction Z of the drive chamber 211. For example... Figure 2 , Figure 3 and Figure 4As shown, to ensure the airtightness of the drive chamber 211, a sealing ring 222 is fitted on the end cover 22. After the end cover 22 is inserted into the opening 212 along the axial direction Z of the drive chamber 211, the sealing ring 222 seals against the inner wall of the opening 212, thereby sealing the opening 212. In addition, a clamping nut 32 and a sealing gasket 33 are fitted on the adjusting screw 3. The clamping nut 32 is threadedly connected to the adjusting screw 3 and is located outside the cylinder body 21. The sealing gasket 33 is located between the end cover 22 and the clamping nut 32. The clamping nut 32 can press the sealing gasket 33 tightly to the opening of the threaded hole 221, thereby preventing the driving medium from leaking from the gap between the threaded hole 221 and the adjusting screw 3. The drive chamber 211 is used to mount the piston structure 1, allowing the piston structure 1 to slide along the axial direction Z of the drive chamber 211 under the drive of the driving medium within the drive chamber 211. When the piston structure 1 slides towards the adjusting screw 3 until it abuts against the adjusting screw 3, it can no longer slide in that direction due to the restriction of the adjusting screw 3. Therefore, by rotating the adjusting screw 3, the length of the adjusting screw 3 screwed into the drive chamber 211 can be adjusted, thereby changing the linear stroke of the piston structure 1. In addition, to avoid impact on the piston structure 1 when the adjusting screw 3 abuts against the piston structure 1, a buffer 31 is provided at the end of the adjusting screw 3 that extends into the drive chamber 211.

[0041] like Figure 3 and Figure 4 As shown in the embodiment of this utility model, in order to enable the anti-rotation structure 23 to more stably restrict the rotation of the end cap 22, the anti-rotation groove 232 has two anti-rotation limiting surfaces arranged opposite each other in the tangential direction Y of the opening 212, and one end of the anti-rotation member 231 abuts between the two anti-rotation limiting surfaces. Therefore, the limiting force generated by the anti-rotation member 231 abutting against the anti-rotation limiting surface is along the tangential direction Y of the opening 212, so that when the end cap 22 has a tendency to rotate when the adjusting screw 3 rotates, the rotation of the end cap 22 can be more stably restricted.

[0042] like Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments of this utility model, in order to facilitate the processing of the anti-rotation groove 232 and the installation of the anti-rotation component 231, the anti-rotation groove 232 is provided on the inner wall surface of the opening 212, one end of the anti-rotation component 231 is connected to the end cap 22, and the other end of the anti-rotation component 231 is inserted into the anti-rotation groove 232.

[0043] Specifically, the cylinder body 21 is also provided with an insertion port 213 that communicates with the anti-rotation groove 232 and the opening 212. One end of the anti-rotation member 231 is connected to the end cover 22, and the other end of the anti-rotation member 231 is inserted into the anti-rotation groove 232 from the insertion port 213 along the axial direction Z of the drive chamber 211. Therefore, the present invention can directly process the communicating insertion port 213 and anti-rotation groove 232 from the end face of the cylinder body 21 by machining or other processing methods in the prior art, so as to realize the insertion and engagement of the anti-rotation member 231 and the anti-rotation groove 232. The processing is simple and easy to install. Mounting holes or grooves can be machined on the end cap 22 using machining or other existing processing methods. First, one end of the anti-rotation component 231 is inserted into the mounting hole or groove. Then, the end cap 22 is aligned with the opening 212, and the other end of the anti-rotation component 231 is aligned with the insertion port 213. The end cap 22 is then sealed within the opening 212 along the axial direction Z of the drive chamber 211, and the other end of the anti-rotation component 231 is inserted into the anti-rotation groove 232 from the insertion port 213 along the axial direction Z of the drive chamber 211. A pin can be used as the anti-rotation component 231; the pin is a standard part, has low cost, and is easy to disassemble and replace.

[0044] Furthermore, combined Figure 2 and Figure 3 As shown, in order to prevent the end cap 22 from coming out of the opening 212 and the anti-rotation component 231 from coming out of the insertion port 213, in the embodiment of this utility model, an axial limiting structure 24 is installed on the inner wall surface of the opening 212. The axial limiting structure 24 can abut against the end cap 22 to restrict the end cap 22 from coming out of the opening 212 and the anti-rotation component 231 from coming out of the insertion port 213.

[0045] Specifically, the axial limiting structure 24 includes a retaining spring 241. An axial limiting groove 242 is provided circumferentially on the inner wall of the opening 212. The retaining spring 241 engages with the axial limiting groove 242 and abuts against the end cap 22 along the axial direction Z of the driving chamber 211, thereby preventing the end cap 22 from dislodging from the opening 212. This also prevents the anti-rotation component 231 from dislodging from the insertion port 213 under the influence of the end cap 22. Furthermore, the axial limiting groove 242 can connect the insertion port 213 and the anti-rotation groove 232, allowing the retaining spring 241 to also abut against the anti-rotation component 231 along the axial direction Z of the driving chamber 211, thereby improving the stability of the anti-rotation component 231.

[0046] In some other embodiments of this utility model, the anti-rotation groove 232 can be provided on the end cap 22, one end of the anti-rotation member 231 can be connected to the inner wall surface of the opening 212, and the other end of the anti-rotation member 231 is inserted into the anti-rotation groove 232.

[0047] In some embodiments of this utility model, the cylinder body 21 is provided with an insertion hole, and one end of the anti-rotation member 231 can pass through the insertion hole and be inserted into the anti-rotation groove 232 on the end cover 22, so that the anti-rotation structure 23 can both restrict the rotation of the end cover 22 and restrict the axial movement of the end cover 22. Preferably, the insertion hole extends radially along the opening 212.

[0048] Implementation Method 2

[0049] like Figure 2 , Figure 6 as well as Figure 7 As shown, this utility model also provides a rotary cylinder, including a cylinder end cap structure 2. The number of drive chambers 211 and end caps 22 in the cylinder end cap structure 2 are respectively set to two, and the two drive chambers 211 are arranged in parallel. In this embodiment, the cylinder end cap structure 2 is the same as the cylinder end cap structure 2 in embodiment one in terms of specific structure, working principle and beneficial effects, and will not be described again here.

[0050] Combine Figure 2 and Figure 7 As shown, the rotary cylinder also includes a gear transmission structure 4, a two-piston structure 1, and two adjusting screws 3. The two-piston structure 1 is installed in the two drive chambers 211. The transmission gear 41 of the gear transmission structure 4 is installed in the cylinder body 21 and meshes with the rack 111 of the two-piston structure 1. The two adjusting screws 3 are threadedly connected to the threaded holes 221 of the end caps 22 and extend into the two drive chambers 211.

[0051] Specifically, such as Figure 2 As shown, the piston structure 1 includes a piston body 11, which has a rack 111 and two piston ends 112. The rack 111 extends axially along the piston body 11 and is disposed on one side of the piston body 11 and between the two piston ends 112. A piston sealing ring is fitted onto each piston end 112. The piston body 11 is in a sealed sliding fit with the inner wall of the drive chamber 211 through the piston sealing ring. Furthermore, a magnet 12 is also provided on the piston body 11, preferably located at the middle position of the piston body 11. The magnet 12 is used to cooperate with a position sensor to achieve position feedback of the piston body 11. The working principle and beneficial effects involved are the same as those in the prior art and will not be described in detail here.

[0052] Combine Figure 2 , Figure 6 and Figure 7As shown, the gear transmission structure 4 also includes a transmission shaft 42, and a transmission gear 41 is mounted inside the cylinder body 21 via the transmission shaft 42. The transmission gear 41 can be integrally formed onto the transmission shaft 42 to form a gear shaft structure, or it can be assembled onto the transmission shaft 42. The lower end of the transmission shaft 42 is rotatably connected to the cylinder body 21 via a lower bearing 62, and the upper end of the transmission shaft 42 is rotatably connected to the cylinder body 21 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 21 via an upper bearing 61 and connected to the upper end of the transmission shaft 42. The rotary output structure 5 connects to other mechanisms, thereby outputting rotary motion to other mechanisms. The rotary output structure 5 is generally a connecting flange, connected to the upper end of the transmission shaft 42 via bolts 51.

[0053] Among them, such as Figure 2 As shown, both drive chambers 211 are divided into a first air chamber 214 and a second air chamber 215 by corresponding piston structures 1, and the two first air chambers 214 and two second air chambers 215 of the two drive chambers 211 are arranged in a cross pattern. The cylinder body 21 is also provided with a first air inlet, a second air inlet, a first air passage, and a second air passage. The first air inlet is connected to one first air chamber 214 and to another first air chamber 214 through the first air passage. The second air inlet is connected to one second air chamber 215 and to another second air chamber 215 through the second air passage. When the driving gas flows into the two first air chambers 214 from the first air inlet, it can drive the two piston structures 1 to move towards the corresponding second air chamber 215, thereby driving the transmission gear 41 to rotate in one direction. When the driving gas flows into the two second air chambers 215 from the second air inlet, it can drive the two piston structures 1 to move towards the corresponding first air chamber 214, thereby driving the transmission gear 41 to rotate in the other direction.

[0054] In this embodiment, the two piston structures 1 are defined as a first piston structure 101 and a second piston structure 102, respectively. Figure 3 From the perspective shown, a first air chamber 214 is located to the left of the first piston structure 101, and another first air chamber 214 is located to the right of the second piston structure 102. A second air chamber 215 is located to the right of the first piston structure 101, and another second air chamber 215 is located to the left of the second piston structure 102. When the driving gas flows into the two first air chambers 214 from the first air inlet, it can drive the first piston structure 101 to move to the right, and the second piston structure 102 to move to the left, thereby driving the transmission gear 41 to rotate clockwise. When the driving gas flows into the two second air chambers 215 from the second air inlet, it can drive the first piston structure 101 to move to the left, and the second piston structure 102 to move to the right, thereby driving the transmission gear 41 to rotate counterclockwise.

[0055] In addition, a clamping nut 32 and a sealing gasket 33 are fitted on the adjusting screw 3. The clamping nut 32 is threadedly connected to the adjusting screw 3 and is located outside the cylinder body 21. The sealing gasket 33 is located between the end cover 22 and the clamping nut 32. The clamping nut 32 can press the sealing gasket 33 to seal it at the opening of the threaded hole 221.

[0056] The above descriptions are merely a few embodiments of this utility model. Those skilled in the art can make various modifications or variations to the embodiments of this utility model based on the content disclosed in the application documents without departing from the spirit and scope of this utility model.

Claims

1. A cylinder end cap structure, characterized in that, include: The cylinder body (21) has at least one drive chamber (211) inside, and the cylinder body (21) also has at least one opening (212), the opening (212) being connected to the drive chamber (211); At least one end cap (22) is provided to seal the opening (212), and the end cap (22) is provided with a threaded hole (221) for threaded connection with the adjusting screw (3); Among them, at least one anti-rotation structure (23) is provided between the end cap (22) and the opening (212), and the anti-rotation structure (23) includes an anti-rotation groove (232) and an anti-rotation component (231) that fit together.

2. The cylinder end cap structure as described in claim 1, characterized in that, The anti-rotation groove (232) is provided on the inner wall surface of the opening (212). The cylinder body (21) is also provided with an insertion port (213) that communicates with the anti-rotation groove (232) and the opening (212). One end of the anti-rotation member (231) is connected to the end cap (22), and the other end of the anti-rotation member (231) is inserted into the anti-rotation groove (232) from the insertion port (213) along the axial direction of the drive chamber (211).

3. The cylinder end cap structure as described in claim 2, characterized in that, An axial limiting structure (24) is installed on the inner wall of the opening (212). The axial limiting structure (24) can abut against the end cap (22) to restrict the end cap (22) from falling out of the opening (212) and the anti-rotation member (231) from falling out of the insertion port (213).

4. The cylinder end cap structure as described in claim 3, characterized in that, The axial limiting structure (24) includes a retaining ring (241), and the inner wall surface of the opening (212) is provided with an axial limiting groove (242) along its circumference. The retaining ring (241) is inserted into the axial limiting groove (242) and abuts against the end cover (22) along the axial direction of the drive chamber (211).

5. The cylinder end cap structure as described in claim 1, characterized in that, The anti-rotation groove (232) has two anti-rotation limiting surfaces arranged opposite to each other in the tangential direction of the opening (212), and one end of the anti-rotation member (231) abuts between the two anti-rotation limiting surfaces.

6. The cylinder end cap structure as described in claim 2, characterized in that, The end cap (22) is provided with a mounting hole or a mounting groove, and one end of the anti-rotation component (231) is inserted into the mounting hole or the mounting groove.

7. The cylinder end cap structure as described in claim 6, characterized in that, The anti-rotation component (231) is a pin.

8. The cylinder end cap structure as described in claim 1, characterized in that, A sealing ring (222) is fitted on the end cap (22), and the sealing ring (222) is sealed and fitted to the inner wall surface of the opening (212); The threaded hole (221) is arranged along the axial direction of the drive chamber (211), and one end of the adjusting screw (3) can pass through the threaded hole (221) and extend into the drive chamber (211) along the axial direction of the drive chamber (211).

9. A rotary cylinder, characterized in that, The cylinder end cap structure (2) according to any one of claims 1-8 is provided, wherein the number of the drive chamber (211) and the end cap (22) of the cylinder end cap structure (2) is set to two, and the two drive chambers (211) are arranged in parallel. The rotary cylinder also includes a gear transmission structure (4), two piston structures (1) and two adjusting screws (3). The two piston structures (1) are installed in the two drive chambers (211). The transmission gear (41) of the gear transmission structure (4) is installed in the cylinder body (21) and meshes with the rack (111) of the two piston structures (1). The two adjusting screws (3) are threadedly connected to the threaded holes (221) of the two end caps (22) and extend into the two drive chambers (211).

10. The rotary cylinder as described in claim 9, characterized in that, The adjusting screw (3) is fitted with a clamping nut (32) and a sealing gasket (33). The clamping nut (32) is threadedly connected to the adjusting screw (3) and located outside the cylinder body (21). The sealing gasket (33) is located between the end cap (22) and the clamping nut (32). The clamping nut (32) can press the sealing gasket (33) tightly and seal it at the opening of the threaded hole (221).

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