Freely-mounted and adjustable miniature air cylinder

Abstract

The invention discloses a freely installed and adjusted miniature air cylinder, and relates to the technical field of miniature air cylinders, the freely installed and adjusted miniature air cylinder comprises a cylinder body, a main cavity and a hydraulic cavity are arranged in the cylinder body, piston assemblies are movably connected in the main cavity and the hydraulic cavity, and the cylinder body is provided with a miniature hydraulic telescopic head corresponding to the hydraulic cavity; when the angle of the micro hydraulic telescopic head needs to be adjusted to adapt to a complex space, the micro hydraulic telescopic head can deflect and adjust the direction through the large-angle adjusting mechanism. And the cylinder body and the micro hydraulic telescopic head are independently and fixedly mounted, so that the flexibility and the stability of adjustment in an ultra-narrow space scene can be ensured. The miniature hydraulic telescopic head can be adjusted at multiple angles, the miniature hydraulic telescopic head and the cylinder body can be separated, the limitation that a traditional miniature air cylinder actuator body and a driving mechanism must be kept in linear alignment is avoided, flexible angle adjustment and multi-directional installation capacity are achieved, and the requirement for the complex space angle can be met. The use requirements in the fields of electronic manufacturing, medical equipment and the like are met.

Description

Technical Field

[0001] This invention relates to the field of miniature cylinder technology, and specifically to a freely adjustable miniature cylinder. Background Technology

[0002] Miniature cylinders, as key components in industrial automation, are widely used in scenarios such as robotic arm gripping, material sorting, and detection positioning. Traditional miniature cylinders, such as the MD series, employ a thin guide rod design, with a cylinder diameter range of 10-32mm, supporting multi-directional installation. Existing free-mounting cylinders achieve bracketless installation through mounting holes in multiple directions on the cylinder body; while Airtac multi-fixed cylinders use a snap-lock fixing structure, improving installation flexibility. Although these cylinders have solved the space limitation problem to some extent, their drive method is still limited to direct pneumatic transmission.

[0003] In ultra-confined spaces such as electronics manufacturing and medical equipment manufacturing, traditional miniature cylinders exhibit significant shortcomings. Due to size limitations, the actuator body and drive mechanism of miniature cylinders must be aligned in a straight line, making pipeline layout difficult in extreme spaces and unable to adapt to complex spatial angle requirements. To address this, we propose a freely adjustable miniature cylinder. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of difficult installation of miniature cylinders in narrow spaces. This invention provides a freely adjustable miniature cylinder.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] A freely adjustable miniature cylinder includes a cylinder body. The cylinder body has a main chamber and a hydraulic chamber inside, and a piston assembly is movably connected to the main chamber and the hydraulic chamber. A miniature hydraulic telescopic head is provided on the cylinder body corresponding to the hydraulic chamber, and the hydraulic chamber and the miniature hydraulic telescopic head are connected through a pipeline. The miniature hydraulic telescopic head is detachably connected to the cylinder body through a large-angle adjustment mechanism, and an independent installation mechanism is provided on the miniature hydraulic telescopic head. A multi-dimensional installation mechanism is provided on the outer surface of the cylinder body, which enables free installation in multiple directions in narrow spaces.

[0007] Furthermore, the piston assembly includes two pistons that are slidably installed in the main chamber and the hydraulic chamber respectively, and a connecting rod that is fixedly connected between the piston center. The two pistons of the piston assembly move synchronously in the main chamber and the hydraulic chamber under the push of the connecting rod, pushing the hydraulic oil to be transmitted to the miniature hydraulic telescopic head through the hydraulic oil circuit. The inner cavity of the miniature hydraulic telescopic head is movably connected to a miniature working telescopic rod, and the outer end of the miniature working telescopic rod passes through the miniature hydraulic telescopic head and connects to the working equipment.

[0008] Furthermore, the large-angle adjustment mechanism includes a ball joint seat and a hollow ball head. The hollow ball head is rotatably mounted inside the ball joint seat, and the outer end of the hollow ball head is fixedly connected to the inner side of the micro hydraulic telescopic head.

[0009] Furthermore, a threaded cylinder is fixedly connected to the end of the ball joint seat away from the micro hydraulic telescopic head, and a threaded connecting seat is fixedly connected to the upper end of the cylinder body, with the threaded cylinder threadedly connected to the threaded connecting seat.

[0010] Furthermore, the center of the threaded cylinder, the ball joint seat, and the hollow ball head are all provided with through channels. The upper end of the cylinder body is fixedly connected to the output end of the main chamber with a spiral telescopic hose, and the spiral telescopic hose is connected to the oil inlet at the bottom of the micro hydraulic telescopic head through the through channels of the threaded cylinder, the ball joint seat, and the hollow ball head.

[0011] Furthermore, the independent installation mechanism includes an adjustment slide rail fixedly connected to both sides of the miniature hydraulic telescopic head. An adjustment slide block is slidably connected to the adjustment slide rail. An L-shaped fixing bracket is fixedly connected to the outer end of the adjustment slide block by a positioning bolt. The inner end of the positioning bolt passes through the L-shaped fixing bracket and the adjustment slide block and abuts against the outer side of the adjustment slide rail. The rear end of the L-shaped fixing bracket is bent, and a slotted bolt fixing hole is opened at the center of the bent section.

[0012] Furthermore, the miniature hydraulic telescopic head has dovetail grooves at both ends, and dovetail end blocks are inserted and fixed in the dovetail grooves. The two ends of the adjustment slide are connected and fixed to the dovetail end blocks on the corresponding side by bolts.

[0013] Furthermore, the multi-dimensional mounting mechanism includes a fixing frame fixed to the outer wall of the cylinder body, with mounting screws rotatably mounted at both ends of the fixing frame, and the outer wall of the rear end of the mounting screws being provided with connecting external threads.

[0014] Furthermore, the fixed frame has a cross-shaped groove at the center of its front side, and a cross slider is slidably connected in the cross-shaped groove. A slider tensioning screw is inserted through the center of the front side of the cross slider, and a dovetail tensioning slider is fixedly connected to the front end of the slider tensioning screw. A fixing nut is threaded through the rear end of the slider tensioning screw after passing through the cross slider. Multiple main dovetail slides are evenly distributed around the outer wall of the cylinder, and the dovetail tensioning slider is slidably installed in the main dovetail slides.

[0015] Furthermore, the rear ends of the mounting screws on both sides are threaded with auxiliary nut seats, and a clamping fastener is fixedly connected between the two auxiliary nut seats.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. In this invention, the piston of the main chamber intake-driven piston assembly slides synchronously within the main chamber and the hydraulic chamber. The piston assembly pushes the hydraulic oil in the hydraulic chamber, which is then forced into the miniature hydraulic telescopic head through connecting pipes. This causes the miniature working telescopic rod to extend, allowing the working equipment connected to the outer end of the miniature working telescopic rod to perform corresponding operations. When the angle of the miniature hydraulic telescopic head needs to be adjusted to adapt to complex spaces, the miniature hydraulic telescopic head can be deflected and adjusted through a large-angle adjustment mechanism. Furthermore, the cylinder and the miniature hydraulic telescopic head are independently fixed, ensuring flexibility and stability in ultra-narrow spaces. This invention achieves multi-angle adjustment of the miniature hydraulic telescopic head, and the miniature hydraulic telescopic head and cylinder can be separated, avoiding the limitation of traditional miniature cylinder actuators requiring straight alignment between the actuator body and the drive mechanism. The flexible angle adjustment and multi-directional installation capabilities can adapt to complex spatial angle requirements, meeting the needs of fields such as electronics manufacturing and medical equipment.

[0018] 2. By connecting the threaded cylinder and the threaded connector, this invention not only achieves a detachable connection between the ball joint and the cylinder, but also facilitates the installation of the cylinder and the miniature hydraulic telescopic head separately by unscrewing the threaded cylinder in scenarios where there is insufficient space at the actuator end or the cylinder cannot be installed smoothly. This further enhances the installation flexibility of the device in narrow spaces. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is the present invention. Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This is a side sectional view of the present invention;

[0022] Figure 4 This is a top sectional view of the multidimensional fixing mechanism in this invention.

[0023] Reference numerals: 1. Cylinder body; 2. Main chamber; 3. Hydraulic chamber; 4. Piston assembly; 5. Threaded connection seat; 6. Butt threaded cylinder; 7. Ball joint seat; 8. Hollow ball head; 9. Miniature hydraulic telescopic head; 10. Miniature working telescopic rod; 11. Spiral telescopic hose; 12. Adjusting slide; 13. Dovetail end block; 14. Adjusting slide; 15. Positioning bolt; 16. L-shaped fixing angle bracket; 17. Groove bolt fixing hole; 18. Main dovetail slide; 19. Fixing bracket; 20. Mounting screw; 21. Cross slider; 22. Dovetail tensioning slider; 23. Slider tensioning screw; 24. Auxiliary nut seat; 25. Clamping fastener. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] Please see Figure 1 - Figure 4 This invention provides a freely adjustable miniature cylinder, comprising a cylinder body 1, wherein the cylinder body 1 has a main chamber 2 and a hydraulic chamber 3 inside, and a piston assembly 4 is movably connected in the main chamber 2 and the hydraulic chamber 3. The cylinder body 1 is provided with a miniature hydraulic telescopic head 9 corresponding to the hydraulic chamber 3, and the hydraulic chamber 3 and the miniature hydraulic telescopic head 9 are connected by a pipeline. The miniature hydraulic telescopic head 9 is detachably connected to the cylinder body 1 through a large-angle adjustment mechanism, and an independent installation mechanism is provided on the miniature hydraulic telescopic head 9. The outer surface of the cylinder body 1 is provided with a multi-dimensional installation mechanism to achieve free installation in multiple directions in narrow spaces.

[0026] The working principle and usage process of this invention are as follows: When in use, air intake in the main chamber 2 pushes the piston of the piston assembly 4 to slide synchronously within the main chamber 2 and the hydraulic chamber 3. The piston assembly 4 pushes the hydraulic oil in the hydraulic chamber, which is then forced into the miniature hydraulic telescopic head 9 through connecting pipes. This causes the miniature working telescopic rod 10 to extend, allowing the working equipment connected to the outer end of the miniature working telescopic rod 10 to perform corresponding operations. When the angle of the miniature hydraulic telescopic head 9 needs to be adjusted to adapt to complex spaces, the miniature hydraulic telescopic head 9 can be adjusted in the deflection direction through a large-angle adjustment mechanism. Furthermore, the cylinder body 1 and the miniature hydraulic telescopic head 9 are independently fixed, ensuring flexibility and stability in ultra-narrow space scenarios. This allows for multi-angle adjustment of the miniature hydraulic telescopic head 9, and the miniature hydraulic telescopic head 9 and cylinder body 1 can be separated, avoiding the limitation of traditional miniature cylinder actuators requiring straight alignment with the drive mechanism. The flexible angle adjustment and multi-directional installation capabilities can adapt to complex spatial angle requirements, meeting the needs of fields such as electronics manufacturing and medical equipment.

[0027] In this embodiment, preferably, the piston assembly 4 includes two pistons slidably mounted in the main chamber 2 and the hydraulic chamber 3 respectively, and a connecting rod fixedly connected between the piston centers. The two pistons of the piston assembly 4 move synchronously in the main chamber 2 and the hydraulic chamber 3 under the push of the connecting rod, driving hydraulic oil through the hydraulic circuit to the miniature hydraulic telescopic head 9. A miniature working telescopic rod 10 is movably connected to the inner cavity of the miniature hydraulic telescopic head 9, and the outer end of the miniature working telescopic rod 10 passes through the miniature hydraulic telescopic head 9 to connect to the working equipment. The area of ​​the miniature piston connected to the miniature working telescopic rod 10 inside the miniature hydraulic telescopic head 9 is 1 / 5 to 1 / 3 of the piston area in the hydraulic chamber 3 of the piston assembly 4, achieving precise amplification of the output force. While ensuring the amplification of the output force, it can also effectively improve the energy conversion efficiency of the device. This force amplification mechanism allows the miniature cylinder to achieve a large working thrust with relatively small driving energy in a narrow space, making it more suitable for working scenarios with extremely high requirements for space and energy utilization, thus improving the practicality and economy of the device.

[0028] In this embodiment, preferably, the large-angle adjustment mechanism includes a ball joint seat 7 and a hollow ball head 8. The hollow ball head 8 is rotatably mounted within the ball joint seat 7, and its outer end is fixedly connected to the inner side of the miniature hydraulic telescopic head 9. The rotatable connection between the ball joint seat 7 and the hollow ball head 8 provides the miniature hydraulic telescopic head 9 with a large-angle adjustment range, enabling flexible rotation in multiple dimensions. In confined spaces, when fine-tuning of the position and angle of the working equipment is required, the operator only needs to manually push the miniature hydraulic telescopic head 9 gently, and the hollow ball head 8 will smoothly rotate within the ball joint seat 7, thereby driving the miniature working telescopic rod 10 to adjust to a suitable working angle.

[0029] In this embodiment, preferably, the ball joint seat 7 is fixedly connected to a threaded cylinder 6 at the end away from the miniature hydraulic telescopic head 9, and a threaded connecting seat 5 is fixedly connected to the upper end of the cylinder body 1. The threaded cylinder 6 is threadedly connected to the threaded connecting seat 5. Through the threaded connection between the threaded cylinder 6 and the threaded connecting seat 5, not only is the ball joint seat 7 and the cylinder body 1 detachably connected, but also in scenarios where there is insufficient space at the actuator end and the cylinder body 1 cannot be installed smoothly, the threaded cylinder 6 can be unscrewed so that the cylinder body 1 and the miniature hydraulic telescopic head 9 can be installed separately, further improving the installation flexibility of the device in narrow spaces.

[0030] In this embodiment, preferably, the center of the threaded cylinder 6, the ball joint seat 7, and the hollow ball head 8 are all provided with through channels. A spiral telescopic hose 11 is fixedly connected to the upper end of the cylinder body 1 corresponding to the output end of the main chamber 2. The spiral telescopic hose 11 passes through the through channels of the threaded cylinder 6, the ball joint seat 7, and the hollow ball head 8 and communicates with the oil inlet at the bottom of the micro hydraulic telescopic head 9. The spiral telescopic hose 11 has good extensibility and flexibility. During the large-angle adjustment of the micro hydraulic telescopic head 9, it can be stretched or compressed accordingly, ensuring that the hydraulic oil transmission channel remains unobstructed and will not be blocked or broken due to angle changes. This design ensures that even when the micro hydraulic telescopic head 9 is adjusted to a large angle, the hydraulic oil can be stably transmitted from the main chamber 2 of the cylinder body 1 to the micro hydraulic telescopic head 9, guaranteeing the stable operation of the device.

[0031] In this embodiment, preferably, the independent installation mechanism includes adjustment slides 12 fixedly connected to both sides of the miniature hydraulic telescopic head 9. An adjustment slide block 14 is slidably connected to the adjustment slide block 12. An L-shaped fixing bracket 16 is fixedly connected to the outer end of the adjustment slide block 14 via a positioning bolt 15. The inner end of the positioning bolt 15 passes through the L-shaped fixing bracket 16 and the adjustment slide block 14 and abuts against the outer side of the adjustment slide block 12. The rear end of the L-shaped fixing bracket 16 is bent, and a slotted bolt fixing hole 17 is provided at the center of the bent section. By sliding the adjustment slide block 14 on the adjustment slide block 12, the position of the L-shaped fixing bracket 16 can be flexibly changed to adapt to different installation requirements. After adjustment to a suitable position, the positioning bolt 15 is tightened, so that the inner end of the positioning bolt 15 abuts tightly against the outer side of the adjustment slide block 12, thereby fixing the adjustment slide block 14 on the adjustment slide block 12 and ensuring installation stability. Meanwhile, the slotted bolt fixing hole 17 at the rear end of the L-shaped fixing bracket 16 makes it convenient to use bolts to connect and fix the miniature hydraulic telescopic head 9 to external equipment. Moreover, the slotted design allows for some adjustment space for bolt installation, which can better adapt to minor deviations during the installation process.

[0032] In this embodiment, preferably, the micro hydraulic telescopic head 9 has dovetail grooves at both the upper and lower ends, and dovetail end blocks 13 are inserted and fixed in the dovetail grooves. The two ends of the adjusting slide 12 are connected and fixed to the dovetail end blocks 13 on the corresponding side by bolts. The matching design of the dovetail grooves and dovetail end blocks 13 facilitates the connection between the adjusting slide 12 and the micro hydraulic telescopic head 9, so that the adjusting slide 12 can be accurately installed on the micro hydraulic telescopic head 9, and is not prone to displacement or loosening during use.

[0033] In this embodiment, preferably, the multi-dimensional installation mechanism includes a fixing frame 19 fixed to the outer wall of the cylinder body 1. Both ends of the fixing frame 19 are rotatably mounted with mounting screws 20, and the outer wall of the rear end of the mounting screws 20 is provided with external threads. During cylinder body 1 installation, the fixing frame 19 is threadedly connected to external equipment or a mounting bracket via the mounting screws 20. This design allows the cylinder body 1 to adapt to different installation scenarios during installation.

[0034] In this embodiment, preferably, the fixing frame 19 has a cross-shaped groove at the center of its front side, and a cross slider 21 is slidably connected in the cross-shaped groove. A slider tensioning screw 23 is inserted through the center of the front side of the cross slider 21, and a dovetail tensioning slider 22 is fixedly connected to the front end of the slider tensioning screw 23. A fixing nut is threaded through the rear end of the slider tensioning screw 23 after passing through the cross slider 21. Multiple main dovetail slides 18 are evenly distributed around the outer wall of the cylinder body 1, and the dovetail tensioning slider 22 is slidably installed in the main dovetail slides 18.

[0035] By sliding the cross slider 21 within the cross-shaped groove, the position of the dovetail tensioning slider 22 on the mounting bracket 19 can be adjusted. Loosening the nut of the slider tensioning screw 23 allows the cross slider 21 and the dovetail tensioning slider 22 to slide freely. After symmetrically inserting the two dovetail tensioning sliders 22 on the mounting bracket 19 into the main body dovetail slide 18 on one side of the cylinder body 1, adjust the position and tilt angle of the mounting bracket 19. Then tighten the fixing nut at the rear end of the slider tensioning screw 23. The tensioning screw 23 pulls the dovetail tensioning slider 22 backward. Through the contact modules on both sides of the main body dovetail slide 18 and the contact friction between the fixing nut and the back side of the mounting bracket 19, the position of the mounting bracket 19 can be fixed. Furthermore, the position of the mounting bracket 19 and the tilt angle of the mounting screws 20 at both ends are adjustable, further enhancing the flexibility and stability of the cylinder body 1 installation.

[0036] In this embodiment, preferably, the rear ends of the mounting screws 20 on both sides are threadedly connected to auxiliary nut seats 24, and a clamping fastener 25 is fixedly connected between the two auxiliary nut seats 24. Where direct connection of the mounting screws 20 is inconvenient, the clamping fastener 25 can be used to clamp and fix the cylinder to external equipment. The clamping fastener 25 can be selected from metal fixed-shape clamps or rubber strips according to actual installation needs. Metal fixed-shape clamps have high strength and stability, suitable for scenarios requiring high installation firmness, ensuring that the cylinder body will not shake or shift during use. Rubber strips, on the other hand, have good flexibility and cushioning performance, and can be used on uneven installation surfaces or when a certain amount of cushioning is required, avoiding damage to external equipment. Through the threaded connection between the auxiliary nut seats 24 and the mounting screws 20, the clamping fastener 25 can be easily adjusted in position and angle to adapt to different installation environments. This diverse installation method allows this freely adjustable miniature cylinder to be flexibly applied in various complex industrial production scenarios.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A freely adjustable miniature cylinder, characterized in that: The cylinder (1) includes a main chamber (2) and a hydraulic chamber (3) inside the cylinder (1). A piston assembly (4) is movably connected in the main chamber (2) and the hydraulic chamber (3). A miniature hydraulic telescopic head (9) is provided in the cylinder (1) corresponding to the hydraulic chamber (3). The hydraulic chamber (3) and the miniature hydraulic telescopic head (9) are connected by a pipeline. The miniature hydraulic telescopic head (9) is detachably connected to the cylinder (1) through a large angle adjustment mechanism. An independent installation mechanism is provided on the miniature hydraulic telescopic head (9). A multi-dimensional installation mechanism is provided on the outer surface of the cylinder (1) to realize free installation in multiple directions in a narrow space.

2. The freely adjustable miniature cylinder according to claim 1, characterized in that: The piston assembly (4) includes two pistons that are slidably installed in the main chamber (2) and the hydraulic chamber (3) respectively, and a connecting rod that is fixedly connected between the piston center. The two pistons of the piston assembly (4) move synchronously in the main chamber (2) and the hydraulic chamber (3) under the push of the connecting rod, pushing the hydraulic oil to be transmitted to the micro hydraulic telescopic head (9) through the hydraulic oil circuit. The inner cavity of the micro hydraulic telescopic head (9) is movably connected to a micro working telescopic rod (10), and the outer end of the micro working telescopic rod (10) passes through the micro hydraulic telescopic head (9) and connects to the working equipment.

3. The freely adjustable miniature cylinder according to claim 1, characterized in that: The large angle adjustment mechanism includes a ball joint seat (7) and a hollow ball head (8). The hollow ball head (8) is rotatably installed inside the ball joint seat (7), and the outer end of the hollow ball head (8) is fixedly connected to the inner side of the micro hydraulic telescopic head (9).

4. A freely adjustable miniature cylinder according to claim 3, characterized in that: The ball joint seat (7) is fixedly connected to a threaded cylinder (6) at the end away from the micro hydraulic telescopic head (9), and a threaded connecting seat (5) is fixedly connected to the upper end of the cylinder body (1). The threaded cylinder (6) is threadedly connected to the threaded connecting seat (5).

5. A freely adjustable miniature cylinder according to claim 4, characterized in that: The center of the threaded cylinder (6), the ball joint seat (7) and the hollow ball head (8) are all provided with through channels. The upper end of the cylinder body (1) is fixedly connected to the output end of the main chamber (2) with a spiral telescopic hose (11). The spiral telescopic hose (11) passes through the through channels of the threaded cylinder (6), the ball joint seat (7) and the hollow ball head (8) and is connected to the oil inlet at the bottom of the micro hydraulic telescopic head (9).

6. A freely adjustable miniature cylinder according to claim 1, characterized in that: The independent installation mechanism includes an adjustment slide (12) fixedly connected to both sides of the miniature hydraulic telescopic head (9). An adjustment slide (14) is slidably connected on the adjustment slide (12). An L-shaped fixing bracket (16) is fixedly connected to the outer end of the adjustment slide (14) by a positioning bolt (15). The inner end of the positioning bolt (15) passes through the L-shaped fixing bracket (16) and the adjustment slide (14) and abuts against the outer side of the adjustment slide (12). The rear end of the L-shaped fixing bracket (16) is bent, and a slotted bolt fixing hole (17) is opened in the center of the bent section.

7. A freely adjustable miniature cylinder according to claim 6, characterized in that: The micro hydraulic telescopic head (9) has dovetail grooves at both ends, and dovetail end blocks (13) are inserted and fixed in the dovetail grooves. The two ends of the adjustment slide (12) are connected and fixed to the dovetail end blocks (13) on the corresponding side by bolts.

8. A freely adjustable miniature cylinder according to claim 1, characterized in that: The multidimensional installation mechanism includes a fixing frame (19) fixed to the outer wall of the cylinder (1). Both ends of the fixing frame (19) are rotatably mounted with mounting screws (20), and the outer wall of the rear end of the mounting screws (20) is provided with connecting external threads.

9. A freely adjustable miniature cylinder according to claim 8, characterized in that: The fixed frame (19) has a cross-shaped groove at the center of its front side, and a cross slider (21) is slidably connected in the cross-shaped groove. A slider tensioning screw (23) is inserted through the center of the front side of the cross slider (21), and a dovetail tensioning slider (22) is fixedly connected to the front end of the slider tensioning screw (23). A fixing nut is threaded through the cross slider (21) at the rear end of the slider tensioning screw (23). Multiple main dovetail slides (18) are evenly distributed around the outer wall of the cylinder (1), and the dovetail tensioning slider (22) is slidably installed in the main dovetail slides (18).

10. A freely adjustable miniature cylinder according to claim 8, characterized in that: The rear ends of the mounting screws (20) on both sides are threaded with auxiliary nut seats (24), and the auxiliary nut seats (24) on both sides are fixedly connected with clamping fasteners (25).

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