Rotary cylinder and hold-down device

Abstract

The utility model relates to the technical field of cylinder, provide a kind of rotary cylinder and pressing device, rotary cylinder includes fixed cylinder, movable cylinder, linear cylinder and guide mechanism, the center axis of fixed cylinder and movable cylinder coincides, one of fixed cylinder and movable cylinder is sheathed in the outside of another, movable cylinder can rotate relative to fixed cylinder around the center axis of fixed cylinder, movable cylinder can slide relative to fixed cylinder along the center axis of fixed cylinder;Linear cylinder exerts force along the center axis of fixed cylinder to movable cylinder;Guide mechanism is located between movable cylinder and fixed cylinder, guide mechanism has axial component force and circumferential component force to movable cylinder when linear cylinder exerts force to movable cylinder, axial component force is parallel to the center axis of fixed cylinder, and circumferential component force is along the circumference of fixed cylinder.Such, rotary action occurs in movable cylinder, linear cylinder only linearly expands and contracts, reduce the wear and tear of piston part of linear cylinder, solve the problem of serious wear and tear of piston part of rotary cylinder in relevant technology.

Description

Technical Field

[0001] This utility model relates to the field of cylinder technology, and in particular to a rotary cylinder and a clamping device. Background Technology

[0002] The sleeve is a key component of the machine tool spindle. During a certain machining process, a pressure plate is used to clamp the cylindrical sleeve to prevent it from shifting during processing. Due to space limitations, the pressure plate needs to be connected to a rotary cylinder. The rotary cylinder drives the pressure plate to clamp the workpiece. When changing parts, the pressure plate swings at a certain angle to avoid the movement of parts during loading and unloading. The rotation and pressing actions of the pressure plate are driven by the rotary cylinder.

[0003] In related technologies, rotary cylinders have a fixed cylinder barrel while the piston moves axially and rotates relative to it. As a crucial sealing component, the piston's prolonged rotation and axial movement cause severe wear on the cylinder barrel's inner wall and the piston's sealing rings, potentially leading to seal failure. Furthermore, due to the large dimensions of the sleeve parts being machined, placing the rotary cylinder on one side of the sleeve requires a very long pressure plate to meet design requirements. This "lever effect" amplifies the impact on the piston, thus limiting the application of rotary cylinders in sleeve machining.

[0004] Therefore, how to solve the problem of severe piston wear in rotary cylinders in related technologies has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] This invention provides a rotary cylinder and a clamping device to solve the defect of severe piston wear in rotary cylinders in related technologies.

[0006] This utility model provides a rotary cylinder, comprising: A fixed cylinder and a movable cylinder have their central axes coincident. One of the fixed cylinder and the movable cylinder is sleeved on the outside of the other. The movable cylinder can rotate relative to the fixed cylinder about the central axis of the fixed cylinder, and the movable cylinder can slide relative to the fixed cylinder along the central axis of the fixed cylinder. A linear cylinder, adapted to apply a force to the movable cylinder along the central axis of the fixed cylinder; A guiding mechanism is disposed between the movable cylinder and the fixed cylinder. The guiding mechanism is configured to exert an axial force and a circumferential force on the movable cylinder when the linear cylinder applies a force to the movable cylinder. The axial force is parallel to the central axis of the fixed cylinder, and the circumferential force is along the circumference of the fixed cylinder.

[0007] According to the present invention, a rotary cylinder is provided, wherein the guiding mechanism includes: A raceway is provided in one of the fixed cylinder and the movable cylinder, and the raceway has at least a curved segment, the extension direction of which is angled to the central axis of the fixed cylinder; A ball bearing, which is rotatably embedded in the other of the fixed cylinder and the movable cylinder, is partially located within the raceway, and the ball bearing and the curved segment are capable of rolling relative to each other along the extension direction of the curved segment.

[0008] According to the present invention, a rotary cylinder is provided, wherein the raceway further has a straight section, the straight section is parallel to the central axis of the fixed cylinder, both ends of the curved section are connected to the straight section, and the ball and the straight section can roll relative to each other along the extension direction of the straight section.

[0009] According to the present invention, a rotary cylinder is provided with at least two raceways, each raceway being distributed at intervals along the circumference of the fixed cylinder, and each raceway corresponding to at least one ball.

[0010] According to the present invention, a rotary cylinder is provided, wherein a fixed cylinder is sleeved on the outside of a movable cylinder, a ball bearing is disposed on the fixed cylinder, the ball bearing portion protrudes from the inner side wall of the fixed cylinder, and a raceway is disposed on the outer side wall of the movable cylinder.

[0011] According to the present invention, a rotary cylinder is provided with a mounting hole, the axis of which is along the radial direction of the fixed cylinder, the ball is located in the mounting hole, and the diameter of the end of the mounting hole near the movable cylinder is smaller than the diameter of the ball. The guiding mechanism also includes: A limiting member is detachably disposed in the mounting hole, and the limiting member is located on the side of the ball away from the movable cylinder.

[0012] According to the rotary cylinder provided by this utility model, it further includes: A protective shell is fitted over the outside of the fixed cylinder and the movable cylinder. The protective shell is fixedly connected to the movable cylinder. The protective shell can rotate relative to the fixed cylinder about the central axis of the fixed cylinder, and the protective shell can slide relative to the fixed cylinder along the central axis of the fixed cylinder.

[0013] According to the present invention, a rotary cylinder, the linear cylinder comprising: A base plate, wherein the fixing cylinder is fixedly disposed on the base plate, and the central axis of the fixing cylinder is perpendicular to the base plate; A cylinder barrel, the first end of which is fixedly connected to the base plate, and the cylinder barrel is located inside the fixed cylinder; A piston portion is disposed inside the cylinder, and the piston portion is in a sliding sealing fit with the cylinder. The piston rod is fixedly disposed on the side of the piston away from the base plate. The central axis of the piston rod coincides with the central axis of the fixed cylinder. The piston rod passes through the second end of the cylinder and is slidably sealed. The piston rod and the movable cylinder can only rotate relative to each other. The base plate has a first channel corresponding to the position of the cylinder's inner cavity, and the side wall of the cylinder has a second channel. Both the first channel and the second channel are connected to the inner cavity of the cylinder. The base plate has a third channel connected to the second channel.

[0014] According to the present invention, a rotary cylinder is provided in which the central axis of the cylinder barrel coincides with the central axis of the fixed barrel, the movable barrel is rotatable relative to the cylinder barrel around the central axis of the fixed barrel, and the movable barrel is slidable relative to the cylinder barrel along the central axis of the fixed barrel.

[0015] This utility model also provides a pressing device, including the above-mentioned rotary cylinder.

[0016] The rotary cylinder provided by this utility model includes a fixed cylinder, a movable cylinder, a linear cylinder, and a guiding mechanism. The central axes of the fixed cylinder and the movable cylinder coincide, and one of the fixed cylinder and the movable cylinder is sleeved on the outside of the other. The movable cylinder can rotate relative to the fixed cylinder about its central axis, and the movable cylinder can also slide relative to the fixed cylinder along its central axis. The linear cylinder applies a force to the movable cylinder along the central axis of the fixed cylinder. The guiding mechanism is disposed between the movable cylinder and the fixed cylinder. When the linear cylinder applies a force to the movable cylinder, the guiding mechanism provides axial and circumferential forces to the movable cylinder. The axial force is parallel to the central axis of the fixed cylinder, enabling the movable cylinder to slide relative to the fixed cylinder along its central axis. The circumferential force is along the circumference of the fixed cylinder, enabling the movable cylinder to rotate relative to the fixed cylinder about its central axis. In other words, when the linear cylinder extends or retracts, it enables the movable cylinder to have rotational movement and axial movement relative to the fixed cylinder. With this configuration, the rotational movement occurs in the movable cylinder, and the frictional force of the rotational movement acts on both the fixed cylinder and the movable cylinder. The linear cylinder extends and retracts only in a linear manner, and the piston of the linear cylinder does not rotate. The piston of the linear cylinder is not subject to the frictional force of rotational motion, which reduces the wear on the piston of the linear cylinder and solves the problem of severe piston wear in rotary cylinders in related technologies.

[0017] Furthermore, the clamping device provided by this utility model has the same advantages as described above because it has a rotary cylinder as described above. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the rotary cylinder provided by this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of the rotary cylinder provided by this utility model when the moving cylinder and the fixed cylinder are separated.

[0021] Figure label: 1. Fixed cylinder; 2. Movable cylinder; 3. Curved section; 4. Ball bearing; 5. Straight section; 6. Mounting hole; 7. Limiting component; 8. Protective shell; 9. Base plate; 10. Cylinder; 11. Piston section; 12. Piston rod section; 13. First channel; 14. Second channel; 15. Third channel; 16. Limiting block; 17. Pressure plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] The following is combined with Figures 1 to 2 This invention describes a rotary cylinder.

[0024] like Figures 1 to 2 As shown, the rotary cylinder provided in this embodiment of the present invention includes a fixed cylinder 1, a movable cylinder 2, a linear cylinder, and a guiding mechanism.

[0025] Specifically, the central axes of the fixed cylinder 1 and the movable cylinder 2 coincide, and one of the fixed cylinder 1 and the movable cylinder 2 is fitted over the other. The movable cylinder 2 can rotate relative to the fixed cylinder 1 about the central axis of the fixed cylinder 1, and the movable cylinder 2 can slide relative to the fixed cylinder 1 along the central axis of the fixed cylinder 1.

[0026] A linear cylinder applies a force to the movable cylinder 2 along the central axis of the fixed cylinder 1. A guide mechanism is positioned between the movable cylinder 2 and the fixed cylinder 1. This guide mechanism provides both axial and circumferential forces to the movable cylinder 2 when the linear cylinder applies the force. The axial force is parallel to the central axis of the fixed cylinder 1, allowing the movable cylinder 2 to slide relative to the fixed cylinder 1 along its central axis. The circumferential force is along the circumference of the fixed cylinder 1, allowing the movable cylinder 2 to rotate relative to the fixed cylinder 1 about its central axis. In other words, when the linear cylinder extends or retracts, it enables the movable cylinder 2 to rotate and move axially relative to the fixed cylinder 1.

[0027] With this configuration, the rotational motion occurs in the movable cylinder 2, and the frictional force of the rotation acts on both the fixed cylinder 1 and the movable cylinder 2. The linear cylinder only extends and retracts linearly; the piston of the linear cylinder does not rotate. The piston of the linear cylinder is not subject to the frictional force of the rotational motion, thus reducing wear on the piston and solving the problem of severe piston wear in rotary cylinders in related technologies.

[0028] Furthermore, the movable cylinder 2 serves as the output end of the rotary cylinder. When the pressure plate 17 is connected to the rotary cylinder, one end of the pressure plate 17 is fixedly connected to the movable cylinder 2 of the rotary cylinder. When the pressure plate 17 exerts force on the workpiece to be pressed, even with a "lever effect," the interaction between the side walls of the movable cylinder 2 and the fixed cylinder 1 in contact can reduce or avoid the bending moment borne by the linear cylinder. The stress condition of the linear cylinder and its piston is further optimized, which helps to reduce the load-bearing capacity requirements of the linear cylinder, improve the load-bearing capacity of the rotary cylinder, and is adaptable to pressure plates 17 with larger lengths.

[0029] In this embodiment of the invention, the guiding mechanism includes a raceway and balls 4.

[0030] The raceway is located in one of the fixed cylinder 1 and the movable cylinder 2, and the balls 4 are rotatably embedded in the other of the fixed cylinder 1 and the movable cylinder 2. Part of the balls 4 is located in the other of the fixed cylinder 1 and the movable cylinder 2, and the other part of the balls 4 is located in the raceway.

[0031] The aforementioned raceway has at least a curved segment 3, the extension direction of which is angled to the central axis of the fixed cylinder 1. The ball bearing 4 and the curved segment 3 of the raceway can roll relative to each other along the extension direction of the curved segment 3. When the ball bearing 4 is located in the curved segment 3 of the raceway, and the linear cylinder exerts a force on the movable cylinder 2 along the central axis of the fixed cylinder 1, the direction of the force exerted by the side wall of the curved segment 3 on the ball bearing 4 is perpendicular to the extension direction of the curved segment 3. This force has an axial component along the central axis of the fixed cylinder 1 and a circumferential component along the circumference of the fixed cylinder 1. At this time, the circumferential component can cause the ball bearing 4 and the curved segment 3 to have a relative motion tendency along the circumference of the movable cylinder 2, thereby causing the movable cylinder 2 to rotate relative to the fixed cylinder 1.

[0032] In a further embodiment, the raceway also has a straight section 5, which is parallel to the central axis of the fixed cylinder 1, and both ends of the curved section 3 are connected to the straight section 5, such as... Figure 2 As shown. The ball 4 and the straight segment 5 can also roll relative to each other along the extension direction of the straight segment 5.

[0033] When the ball bearing 4 is located in the straight section 5 of the raceway, and the linear cylinder exerts a force on the movable cylinder 2 along the central axis of the movable cylinder 2, the ball bearing 4 and the straight section 5 only have a relative motion tendency along the central axis of the movable cylinder 2, which can make the movable cylinder 2 slide relative to the fixed cylinder 1.

[0034] The straight segment 5 increases the displacement of the movable cylinder 2 along the central axis of the fixed cylinder 1. Furthermore, when the rotary cylinder drives the pressure plate 17 to press the workpiece, it first rotates the pressure plate 17 above the workpiece, and then moves it closer to the workpiece along the central axis of the fixed cylinder 1. Similarly, when the rotary cylinder drives the pressure plate 17 to release the workpiece, it first moves the pressure plate 17 away from the workpiece along the central axis of the fixed cylinder 1, and then rotates it to a position beyond above the workpiece. Thus, during the contact or discontinuation process with the workpiece, the pressure plate 17 only displaces relative to the workpiece along the central axis of the fixed cylinder 1, without exerting a force perpendicular to the central axis of the fixed cylinder 1 on the workpiece, ensuring the stability of the workpiece.

[0035] In this embodiment, at least two raceways are provided, each raceway being distributed at intervals along the circumference of the fixed cylinder 1, and each raceway corresponding to at least one ball bearing 4. This helps to improve the stability of the movable cylinder 2 and enhance the load-bearing capacity of the rotary cylinder.

[0036] In a specific embodiment, three raceways are provided, and three balls 4 are provided accordingly.

[0037] In a specific embodiment, the fixed cylinder 1 is sleeved on the outside of the movable cylinder 2, the ball bearing 4 is disposed on the fixed cylinder 1, and part of the ball bearing 4 protrudes from the inner wall of the fixed cylinder 1. The raceway is disposed on the outer wall of the movable cylinder 2, such as... Figure 2 As shown.

[0038] Regarding the mounting structure of the ball bearing 4 on the fixed cylinder 1, in this embodiment, a mounting hole 6 is provided in the fixed cylinder 1, and the axis of the mounting hole 6 is along the radial direction of the fixed cylinder 1. The ball bearing 4 is located inside the mounting hole 6, and the diameter of the end of the mounting hole 6 near the movable cylinder 2 is smaller than the diameter of the ball bearing 4. When the ball bearing 4 is located inside the mounting hole 6, it can prevent the ball bearing 4 from falling off from the inside of the fixed cylinder 1.

[0039] At this time, the guiding mechanism also includes a limiting member 7, which is detachably disposed in the mounting hole 6 and located on the side of the ball 4 away from the movable cylinder 2. In this way, the limiting member 7 can prevent the ball 4 from falling off the outside of the fixed cylinder 1 to ensure the stability of the ball 4.

[0040] Specifically, the limiting component 7 can be a limiting screw, which is threaded to the side wall of the mounting hole 6.

[0041] In a further embodiment, the rotary cylinder also includes a protective shell 8, which is sleeved on the outside of the fixed cylinder 1 and the movable cylinder 2, and is fixedly connected to the movable cylinder 2. The protective shell 8 can rotate relative to the fixed cylinder 1 around the central axis of the fixed cylinder 1 together with the movable cylinder 2, and the protective shell 8 can slide relative to the fixed cylinder 1 along the central axis of the fixed cylinder 1 together with the movable cylinder 2.

[0042] The protective shell 8 is installed on the outside of the fixed cylinder 1 and the movable cylinder 2. It can cover the gap between the fixed cylinder 1 and the movable cylinder 2, prevent external impurities from entering the gap between the movable cylinder 2 and the fixed cylinder 1, avoid the wear of external impurities on the ball 4 and the raceway, and avoid jamming problems.

[0043] In this embodiment of the utility model, the linear cylinder includes a base plate 9, a cylinder barrel 10, and a piston section 11.

[0044] The base serves as a support, and the fixed cylinder 1 is fixedly mounted on the base plate 9, with its central axis perpendicular to the base plate 9. The cylinder 10 is located inside the fixed cylinder 1, with its central axis perpendicular to the base plate 9. The first end of the cylinder 10 is fixedly connected to the base plate 9. A piston part 11 is disposed inside the cylinder 10, and the piston part 11 and the cylinder 10 are in a sliding, sealed fit. A piston rod part 12 is provided on the side of the piston part 11 away from the base plate 9, with its central axis coinciding with the central axis of the fixed cylinder 1. The piston rod part 12 passes through the second end of the cylinder 10 and is in a sliding, sealed fit. A rod chamber and a rodless chamber are formed on both sides of the piston part 11, respectively. Under the pressure difference between the rod chamber and the rodless chamber, the piston part 11 will slide relative to the cylinder 10.

[0045] The piston rod 12 and the movable cylinder 2 can only rotate relative to each other. The piston rod 12 and the movable cylinder 2 will not move relative to each other along the central axis of the fixed cylinder 1. Therefore, when the piston 11 slides relative to the cylinder 10, it can drive the movable cylinder 2 to slide relative to the fixed cylinder 1, and the piston rod 12 will not be affected by the rotation of the movable cylinder 2 relative to the fixed cylinder 1.

[0046] Specifically, regarding the connection structure between the piston rod 12 and the movable cylinder 2, a first through hole and a second through hole can be provided at the end of the movable cylinder 2 away from the base plate 9. The first through hole is located on the side of the second through hole closer to the piston rod 12, and the cross-sectional area of ​​the first through hole is smaller than that of the second through hole. A first limiting flange is formed at a position close to the first through hole and the second through hole. Figure 1 As shown. Limiting blocks 16 are provided within the first and second through holes. Each limiting block 16 has a first limiting portion and a second limiting portion. The first limiting portion is located within the first through hole, and the second limiting portion is located within the second through hole. The cross-sectional area of ​​the second limiting portion is larger than that of the first limiting portion. A second limiting flange is formed at a position close to the first and second limiting portions. The second limiting flange abuts against the first limiting flange. The limiting blocks 16 are fixedly connected to the piston rod portion 12 using bolts (not shown). The end of the piston rod portion 12 abuts against the end wall of the first through hole. Through the interaction between the piston rod portion 12 and the end wall of the first through hole, and the interaction between the second limiting flange and the first limiting flange, a force along the central axis of the fixed cylinder 1 can be transmitted between the piston rod portion 12 and the movable cylinder 2. The cross-sectional area of ​​the first through hole is larger than the cross-sectional area of ​​the first limiting part, so that the first through hole and the first limiting part are in clearance fit, so that the first limiting part can rotate in the first through hole, and the movable cylinder 2 can rotate relative to the piston rod part 12.

[0047] A first channel 13 is provided at the position of the bottom plate 9 corresponding to the inner cavity of the cylinder 10. The first channel 13 is connected to the inner cavity of the cylinder 10, that is, the first channel 13 is connected to the rodless cavity.

[0048] The side wall of the cylinder 10 is provided with a second channel 14, which is connected to the inner cavity of the cylinder 10. That is to say, the second channel 14 is connected to the rod cavity.

[0049] A third channel 15 is provided on the base plate 9, and the third channel 15 is connected to the second channel 14.

[0050] Thus, pneumatic circuits can be connected at positions 13 and 15 of the first channel on the base plate 9, and the pressure in the rod chamber and rodless chamber can be controlled using a pneumatic control system. By controlling the pressure in the rod chamber and rodless chamber as needed, the extension and retraction of the linear cylinder can be controlled as required.

[0051] In this embodiment, the central axis of the cylinder 10 coincides with the central axis of the fixed cylinder 1. The movable cylinder 2 can rotate relative to the cylinder 10 around the central axis of the fixed cylinder 1, and the movable cylinder 2 can slide relative to the cylinder 10 along the central axis of the fixed cylinder 1. Through the cooperation of the cylinder 10 and the movable cylinder 2, the stability of the movable cylinder 2 and the load-bearing capacity of the rotary cylinder can be further improved.

[0052] On the other hand, this embodiment of the present invention also provides a clamping device, including the rotary cylinder provided in any of the above embodiments. The rotary cylinder provided in any of the above embodiments reduces wear on its own piston part 11, so the clamping device in this embodiment has the advantages of low failure rate, long service life, and large clamping force. The derivation process of the beneficial effects of the clamping device in this embodiment of the present invention is largely similar to the derivation process of the beneficial effects of the rotary cylinder described above, so it will not be repeated here.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rotary cylinder, characterized in that, include: The fixed cylinder (1) and the movable cylinder (2) have their central axes coincide. One of the fixed cylinder (1) and the movable cylinder (2) is sleeved on the outside of the other. The movable cylinder (2) can rotate relative to the fixed cylinder (1) around the central axis of the fixed cylinder (1), and the movable cylinder (2) can slide relative to the fixed cylinder (1) along the central axis of the fixed cylinder (1). A linear cylinder is adapted to apply a force to the movable cylinder (2) along the central axis of the fixed cylinder (1); A guiding mechanism is provided between the movable cylinder (2) and the fixed cylinder (1). The guiding mechanism is configured to have an axial component force and a circumferential component force on the movable cylinder (2) when the linear cylinder applies a force to the movable cylinder (2). The axial component force is parallel to the central axis of the fixed cylinder (1), and the circumferential component force is along the circumference of the fixed cylinder (1).

2. The rotary cylinder according to claim 1, characterized in that, The guiding mechanism includes: A raceway is provided in one of the fixed cylinder (1) and the movable cylinder (2), and the raceway has at least a curved section (3) whose extension direction is at an angle to the central axis of the fixed cylinder (1). A ball (4) is rotatably embedded in the other of the fixed cylinder (1) and the movable cylinder (2), the ball (4) being partially located within the raceway, and the ball (4) and the curved segment (3) being able to roll relative to each other along the extension direction of the curved segment (3).

3. The rotary cylinder according to claim 2, characterized in that, The raceway also has a straight section (5) that is parallel to the central axis of the fixed cylinder (1). Both ends of the curved section (3) are connected to the straight section (5). The ball (4) and the straight section (5) can roll relative to each other along the extension direction of the straight section (5).

4. The rotary cylinder according to claim 2, characterized in that, The raceway is provided with at least two raceways, each raceway being distributed at intervals along the circumference of the fixed cylinder (1), and each raceway corresponding to at least one ball (4).

5. The rotary cylinder according to claim 2, characterized in that, The fixed cylinder (1) is sleeved on the outside of the movable cylinder (2), the ball (4) is disposed on the fixed cylinder (1), the ball (4) protrudes from the inner wall of the fixed cylinder (1), and the raceway is disposed on the outer wall of the movable cylinder (2).

6. The rotary cylinder according to claim 5, characterized in that, The fixed cylinder (1) is provided with a mounting hole (6), the axis of the mounting hole (6) is along the radial direction of the fixed cylinder (1), the ball (4) is located in the mounting hole (6), and the diameter of the end of the mounting hole (6) near the movable cylinder (2) is smaller than the diameter of the ball (4). The guiding mechanism also includes: The limiting member (7) is detachably disposed in the mounting hole (6), and the limiting member (7) is located on the side of the ball (4) away from the movable cylinder (2).

7. The rotary cylinder according to claim 1, characterized in that, Also includes: A protective shell (8) is fitted over the outside of the fixed cylinder (1) and the movable cylinder (2). The protective shell (8) is fixedly connected to the movable cylinder (2). The protective shell (8) can rotate relative to the fixed cylinder (1) around the central axis of the fixed cylinder (1), and the protective shell (8) can slide relative to the fixed cylinder (1) along the central axis of the fixed cylinder (1).

8. The rotary cylinder according to claim 1, characterized in that, The linear cylinder includes: The base plate (9) is fixedly mounted on the base plate (9), and the central axis of the fixed cylinder (1) is perpendicular to the base plate (9). Cylinder (10), the first end of the cylinder (10) is fixedly connected to the base plate (9), and the cylinder (10) is located inside the fixed cylinder (1); A piston part (11) is disposed inside the cylinder (10), and the piston part (11) and the cylinder (10) are in sliding sealing cooperation; The piston rod (12) is fixedly disposed on the side of the piston (11) away from the base plate (9). The central axis of the piston rod (12) coincides with the central axis of the fixed cylinder (1). The piston rod (12) passes through the second end of the cylinder (10) and is slidably sealed. The piston rod (12) and the movable cylinder (2) can only rotate relative to each other. The base plate (9) is provided with a first channel (13) corresponding to the position of the inner cavity of the cylinder (10), and the side wall of the cylinder (10) is provided with a second channel (14). The first channel (13) and the second channel (14) are both connected to the inner cavity of the cylinder (10). The base plate (9) is provided with a third channel (15) connected to the second channel (14).

9. The rotary cylinder according to claim 8, characterized in that, The central axis of the cylinder (10) coincides with the central axis of the fixed cylinder (1). The movable cylinder (2) can rotate relative to the cylinder (10) around the central axis of the fixed cylinder (1). The movable cylinder (2) can slide relative to the cylinder (10) along the central axis of the fixed cylinder (1).

10. A clamping device, characterized in that, Including the rotary cylinder as described in any one of claims 1-9.

Images