Three-turning oil cylinder

Abstract

The utility model relates to the technical field of hydraulic pressure, and particularly discloses a three-turning oil cylinder which comprises an oil cylinder body, an outer ball head is arranged at the telescopic end of the oil cylinder body, a supporting disc is arranged at the bottom of a vehicle large box, and connecting pieces used for enabling the supporting disc and the outer ball head to be rotationally connected are arranged on the outer ball head and the supporting disc. A steering mechanism for enabling the oil cylinder to rotate in three directions is arranged on the oil cylinder; the connecting piece can enable the outer ball head and the supporting disc to be rotationally connected, the steering mechanism can enable the oil cylinder to rotate in three directions, and when the oil cylinder rotates in the three directions, the telescopic end of the oil cylinder can rotate towards the tail of the vehicle and the two side faces of the vehicle; therefore, the vehicle large box is driven to rotate towards the tail and the two side faces of the vehicle through connection between the outer ball head and the supporting disc, and the cargo loading and unloading capacity of the vehicle large box is improved.

Description

Technical Field

[0001] The present application relates to the field of hydraulic technology, and in particular to a three-turn oil cylinder. Background Art

[0002] A vehicle box usually refers to a large cargo box or container on a truck or freight vehicle, which is a closed cargo box used to transport large quantities of goods or items. This vehicle box is usually made of materials such as metal or plastic, which can protect the goods from the external environment and facilitate loading and unloading and transportation. Vehicle boxes play a very important role in the logistics and freight industries and are widely used for cargo transportation in various occasions.

[0003] In the related art, in order to facilitate the unloading of goods, a cylinder is generally installed at the bottom of the vehicle box. The fixed end of the cylinder is fixedly installed under the vehicle box and installed at the bottom of the vehicle, and the telescopic end of the cylinder is rotatably installed on the lower bottom surface of the vehicle box. When the telescopic end of the cylinder is extended, the end of the vehicle box close to the front of the vehicle will be raised, thereby facilitating the dumping of the goods.

[0004] With regard to the above-mentioned related technologies, the vehicle box can only be tilted toward the rear of the vehicle along the length direction of the vehicle. When encountering more complicated road conditions, such as crowded parking spaces and no unloading space behind the vehicle, the unloading personnel are required to manually unload the goods bit by bit, which is inefficient and has a heavy workload, so improvements are made. Utility Model Content

[0005] In order to realize the loading and unloading capacity of cargoes in a vehicle box, the present application provides a three-turn cylinder.

[0006] The present application provides a three-turn hydraulic cylinder, which adopts the following technical solution:

[0007] A three-turn cylinder comprises a cylinder, an outer ball head is arranged on the telescopic end of the cylinder, a support plate is arranged at the bottom of a vehicle box, connecting parts for rotatably connecting the support plate and the outer ball head are arranged on the outer ball head and the support plate, and a steering mechanism for rotating the cylinder in three directions is arranged on the cylinder.

[0008] By adopting the above technical solution, the connecting piece can make the outer ball head and the support plate rotatably connected, and the steering mechanism can make the cylinder rotate in three directions. While the cylinder rotates in three directions, the telescopic end of the cylinder can rotate toward the rear of the vehicle and the two sides of the vehicle, thereby realizing the connection between the outer ball head and the support plate to drive the vehicle box to rotate toward the rear of the vehicle and the two sides of the vehicle, thereby improving the loading and unloading capacity of the vehicle box for goods.

[0009] Optionally, the steering mechanism includes a support, a first hinge shaft, a crosshead assembly, a second hinge shaft and a drive assembly, wherein two groups of supports are provided, and the two groups of supports are symmetrically arranged on both sides of the cylinder along the length direction of the vehicle, and the crosshead assembly is arranged between the two groups of supports, and two groups of first hinge shafts are provided, and the two groups of first hinge shafts are symmetrically arranged on the crosshead assembly and are rotatably connected to the two groups of supports respectively, and two groups of second hinge shafts are provided, and the two groups of second hinge shafts are symmetrically arranged on the side wall of the cylinder along the width direction of the vehicle, and an installation groove is opened on the crosshead assembly, and the second hinge shaft is rotatably arranged in the installation groove, and the drive assembly can tilt the second hinge shaft to drive the cylinder to deflect in two width directions of the vehicle.

[0010] By adopting the above technical solution, when the telescopic end of the cylinder is extended, with the cooperation of the outer ball head and the second hinge shaft, the cylinder swings with the second hinge shaft as the rotation axis in the crosshead assembly, thereby realizing the tilting of the vehicle box in the length direction of the vehicle, which is convenient for loading and unloading of goods from the rear of the vehicle. When the driving component is that the second hinge shaft is tilted and there is an angle with the horizontal plane, the first hinge shaft rotates at the same time, and the cylinder swings with the first hinge shaft as the rotation axis, thereby realizing the tilting of the vehicle box in the width direction of the vehicle, which is convenient for loading and unloading of goods from the side of the vehicle.

[0011] Optionally, the driving assembly includes a driving motor, a driving gear, a rotating ring and a gear ring, the driving motor is arranged at the bottom of the vehicle, and the driving gear is arranged on the output shaft of the driving motor, the rotating ring is arranged at the bottom of the vehicle, and the gear ring is arranged on the outer peripheral wall of the rotating ring, the driving gear and the gear ring are meshed with each other, and an annular groove is obliquely opened on the inner wall of the rotating ring, and the end of the second hinge shaft away from the cylinder is slidably arranged in the annular groove, and when the inclination angle of the vehicle box is maximum, the two groups of the second hinge shafts away from the ends of the cylinder are respectively located at the highest point and the lowest point in the annular groove, the cylinder is located in the middle of the rotating ring, and the diameter of the rotating ring is greater than the spacing between the two groups of the supports.

[0012] By adopting the above technical solution, the driving motor is started, and the driving motor drives the active gear to rotate. Since the active gear and the gear ring are meshed with each other, the active gear can drive the rotating ring to rotate. When the rotating ring rotates, the end of the second hinge shaft away from the cylinder moves in the annular groove, and since the annular groove is inclined, when one of the two sets of second hinge shafts has one end away from the cylinder at the highest point, the other end away from the cylinder is at the lowest point, thereby realizing the tilting of the cylinder in the width direction of the vehicle, thereby realizing the tilting of the vehicle box in the width direction of the vehicle.

[0013] Optionally, limit blocks are provided at both the highest point and the lowest point in the annular groove.

[0014] By adopting the above technical solution, when the end of the second hinge shaft away from the cylinder contacts the limit block, the limit block can limit the end of the second hinge shaft away from the cylinder, thereby ensuring that the height difference between the ends of the two groups of second hinge shafts away from the cylinder is maximized and the inclination angle of the vehicle box is also maximized.

[0015] Optionally, the crosshead assembly is provided with a stabilizing member for improving the stability between the crosshead assembly and the second hinge shaft.

[0016] By adopting the above technical solution, the stabilizing member can prevent the second hinge shaft from being separated from the crosshead assembly, thereby improving the stability of the connection between the second hinge shaft and the crosshead assembly.

[0017] Optionally, an elastic telescopic rod is provided at one end of the second hinge shaft away from the oil cylinder, and the telescopic end of the elastic telescopic rod is arranged in the annular groove.

[0018] By adopting the above technical solution, when the first hinge shaft rotates, the telescopic end of the elastic telescopic rod can always be in the annular groove, avoiding the situation where the second hinge shaft is separated from the annular groove or the length in the annular groove is short when the second hinge shaft rotates, thereby improving the reliability between the second hinge shaft and the annular groove.

[0019] Optionally, a rotating cap is rotatably provided at the end of the elastic telescopic rod away from the oil cylinder, and the rotating cap is rollingly provided in the annular groove.

[0020] By adopting the above technical solution, when the rotating cap rolls in the annular groove, the friction between the elastic telescopic rod and the inner wall of the annular groove can be reduced, thereby reducing the load of the drive motor and extending the service life of the drive motor.

[0021] Optionally, the support seat, the support plate and the stabilizing member are provided with oil cups for improving the lubrication of the ball head, the first hinge shaft and the second hinge shaft during rotation.

[0022] By adopting the above technical solution, the oil discharge from the oil cup can reduce the friction force when the ball head, the first hinge shaft and the second hinge shaft rotate, reduce mechanical losses and improve the smoothness of mechanical operation.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The steering mechanism can make the oil cylinder rotate in three directions. While the oil cylinder rotates in three directions, the telescopic end of the oil cylinder can rotate toward the rear of the vehicle and the two sides of the vehicle, thereby driving the vehicle box to rotate toward the rear of the vehicle and the two sides of the vehicle through the connection between the outer ball head and the support plate, thereby improving the loading and unloading capacity of the vehicle box for goods;

[0025] 2. When the first hinge shaft rotates, the telescopic end of the elastic telescopic rod can always be in the annular groove, avoiding the situation where the second hinge shaft is separated from the annular groove or the length in the annular groove is short when the second hinge shaft rotates, thereby improving the reliability between the second hinge shaft and the annular groove;

[0026] 3. When the rotating cap rolls in the annular groove, the friction between the elastic telescopic rod and the inner wall of the annular groove can be reduced, thereby reducing the load of the drive motor and extending the service life of the drive motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of this application;

[0029] Figure 2 yes Figure 1 Another perspective diagram

[0030] Figure 3 It is a schematic diagram of the structure of the rotating ring;

[0031] Figure numerals: 1. Cylinder; 11. Outer ball head; 12. Connecting piece; 121. Semicircular clamp; 122. Retaining ring bolt; 13. Support plate; 2. Steering mechanism; 21. Support; 22. First hinge shaft; 23. Crosshead assembly; 231. Mounting groove; 232. Stabilizing piece; 24. Second hinge shaft; 3. Driving assembly; 31. Driving motor; 32. Driving gear; 33. Rotating ring; 331. Annular groove; 332. Limiting block; 34. Gear ring; 4. Elastic telescopic rod; 5. Rotating cap; 6. Oil cup. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-3 , further details of this application are given.

[0033] The embodiment of the present application discloses a three-turn cylinder 1.

[0034] Reference Figure 1 and Figure 2A three-turn oil cylinder 1 comprises an oil cylinder 1, an outer ball head 11 is welded and installed on the telescopic end of the oil cylinder 1, a support plate 13 is welded and installed on the bottom of the vehicle box, a connecting piece 12 is arranged on the outer ball head 11 and the support plate 13, and a steering mechanism 2 is arranged on the oil cylinder 1; in this embodiment, the connecting piece 12 comprises two semicircular clamps 121 and a clamping ring bolt 122, and a side of the semicircular clamp 121 close to the outer ball head 11 is an inner concave arc surface that fits the shape of the outer ball head 11, the semicircular clamp 121 is installed on the side of the outer ball head 11 close to the oil cylinder 1, and the semicircular clamp 121 is fixed by the clamping ring bolt 122. 1 is fixedly connected with the support plate 13, so that the rotational connection between the outer ball head 11 and the support plate 13 can be realized. The connecting piece 12 can make the outer ball head 11 and the support plate 13 rotationally connected. The steering mechanism 2 can make the oil cylinder 1 rotate in three directions. When the oil cylinder 1 rotates in three directions, the telescopic end of the oil cylinder 1 can rotate toward the rear of the vehicle and the two sides of the vehicle, so that the vehicle box is driven to rotate toward the rear of the vehicle and the two sides of the vehicle through the connection between the outer ball head 11 and the support plate 13, thereby improving the loading and unloading capacity of the vehicle box for goods.

[0035] In order to realize that the telescopic end of the oil cylinder 1 can rotate toward the rear of the vehicle and in two width directions of the vehicle, refer to Figure 1 and Figure 2 The steering mechanism 2 in the present application includes a support 21, a first hinge shaft 22, a crosshead assembly 23, a second hinge shaft 24 and a drive assembly 3. The support 21 is installed with two groups, and the two groups of supports 21 are symmetrically fixedly installed on both sides of the cylinder 1 along the length direction of the vehicle. The crosshead assembly 23 is installed between the two groups of supports 21. There are two groups of first hinge shafts 22, and the two groups of first hinge shafts 22 are symmetrically welded and installed on the crosshead assembly 23, and are rotatably connected to the two groups of supports 21 respectively. There are two groups of second hinge shafts 24, and the two groups of second hinge shafts 24 are symmetrically welded and installed on the side wall of the cylinder 1 along the width direction of the vehicle. A mounting groove 231 is opened on the crosshead assembly 23, and the second hinge shaft 24 is rotatably installed in the mounting groove 231. A stabilizing member 232 is provided on the crosshead assembly 23, and the drive assembly 3 can tilt the second hinge shaft 24 to drive the cylinder 1 to deflect in two width directions of the vehicle.

[0036] When the telescopic end of the oil cylinder 1 is extended, with the cooperation of the outer ball head 11 and the second hinge shaft 24, the oil cylinder 1 swings with the second hinge shaft 24 as the rotation axis in the cross head assembly 23, so that the vehicle box is tilted in the length direction of the vehicle, which is convenient for loading and unloading goods from the rear of the vehicle. When the driving component 3 causes the second hinge shaft 24 to tilt and there is an angle with the horizontal plane, the first hinge shaft 22 rotates at the same time, and the oil cylinder 1 swings with the first hinge shaft 22 as the rotation axis, so that the vehicle box is tilted in the width direction of the vehicle, which is convenient for loading and unloading goods from the side of the vehicle. During loading and unloading of goods, the stabilizing member 232 can prevent the second hinge shaft 24 from being separated from the crosshead assembly 23, thereby improving the stability of the connection between the second hinge shaft 24 and the crosshead assembly 23. In the present embodiment, the stabilizing member 232 is a pressure plate, and a surface of the pressure plate close to the second hinge shaft 24 is an inwardly concave arc surface that fits the side wall of the second hinge shaft 24. Through the fixed connection between the pressure plate and the crosshead assembly 23, the stability between the second hinge shaft 24 and the crosshead assembly 23 can be improved, and the second hinge shaft 24 can be prevented from being separated from the mounting groove 231.

[0037] When loading and unloading goods from the side of the vehicle, the telescopic end of the oil cylinder 1 needs to be rotated toward the two sides of the vehicle. Therefore, in order to rotate the telescopic end of the oil cylinder 1 toward the two sides of the vehicle, refer to Figure 1 , Figure 2 and Figure 3 The driving assembly 3 in the present application includes a driving motor 31, a driving gear 32, a rotating ring 33 and a gear ring 34. The driving motor 31 is installed at the bottom of the vehicle, and the driving gear 32 is fixedly installed on the output shaft of the driving motor 31. The rotating ring 33 is installed at the bottom of the vehicle. The gear ring 34 is welded and installed on the outer peripheral wall of the rotating ring 33. The driving gear 32 and the gear ring 34 are meshed with each other. An annular groove 331 is obliquely opened on the inner wall of the rotating ring 33. The highest point and the lowest point in the annular groove 331 are welded and installed with a limiting block 332. The end of the second hinge shaft 24 away from the oil cylinder 1 is slidably installed in the annular groove 331. When the tilt angle of the vehicle box is the largest, the ends of the two groups of second hinge shafts 24 away from the oil cylinder 1 are respectively located at the highest point and the lowest point in the annular groove 331. The oil cylinder 1 is located in the middle of the rotating ring 33, and the diameter of the rotating ring 33 is greater than the distance between the two groups of supports 21.

[0038] The driving motor 31 is started, and the driving motor 31 drives the driving gear 32 to rotate. Since the driving gear 32 and the gear ring 34 are meshed with each other, the driving gear 32 can drive the rotating ring 33 to rotate. When the rotating ring 33 rotates, the end of the second hinge shaft 24 away from the cylinder 1 moves in the annular groove 331, and since the annular groove 331 is inclined, when one end of the two sets of second hinge shafts 24 away from the cylinder 1 is at the highest point, the other end away from the cylinder 1 is at the lowest point, thereby realizing the inclination of the cylinder 1 in the vehicle width direction, thereby realizing the inclination of the vehicle box in the vehicle width direction, and when the end of the second hinge shaft 24 away from the cylinder 1 contacts the limit block 332, the limit block 332 can limit the end of the second hinge shaft 24 away from the cylinder 1, thereby ensuring that the height difference between the ends of the two sets of second hinge shafts 24 away from the cylinder 1 is the largest, and the inclination angle of the vehicle box is also the largest. When cargo loading and unloading is only required from the rear of the vehicle, the second hinge shaft 24 remains in a horizontal state.

[0039] When the retracted end of the oil cylinder 1 rotates toward the two sides of the vehicle, the end of the second hinge shaft 24 away from the oil cylinder 1 moves in the annular groove 331, and the second hinge shaft 24 tilts. When the tilt angle is large, the second hinge shaft 24 may be separated from the annular groove 331. Figure 1 Therefore, the end of the second hinge shaft 24 in the present application away from the oil cylinder 1 is fixedly installed with an elastic telescopic rod 4, the telescopic end of the elastic telescopic rod 4 is installed in the annular groove 331, and the end of the elastic telescopic rod 4 away from the oil cylinder 1 is rotatably installed with a rotating cap 5. Under the action of the elastic telescopic rod 4, the side of the rotating cap 5 away from the oil cylinder 1 abuts against the inner bottom wall of the annular groove 331, and the rotating cap 5 is rolled in the annular groove 331, and the annular groove 331 is opened to fit the movement trajectory of the rotating cap 5; when the first hinge shaft 22 rotates, the telescopic end of the elastic telescopic rod 4 can always be in the annular groove 331, avoiding the situation that the annular groove 331 is separated or the length in the annular groove 331 is short when the second hinge shaft 24 rotates, thereby improving the reliability between the second hinge shaft 24 and the annular groove 331, and when the rotating cap 5 rolls in the annular groove 331, the friction between the elastic telescopic rod 4 and the inner wall of the annular groove 331 can be reduced, thereby reducing the load of the drive motor 31 and extending the service life of the drive motor 31.

[0040] Using an elastic telescopic rod 4 to make the end of the second hinge shaft 24 abut against the inner bottom wall of the annular groove 331 is a preferred method of this embodiment. In other embodiments, the thickness of the rotating ring 33 can be thickened, and the second hinge shaft 24 can be extended to always keep the end of the second hinge shaft 24 in the annular groove 331. At this time, the annular groove 331 needs to fit the movement trajectory of the end of the second hinge shaft 24 away from the cylinder 1.

[0041] Since the oil cylinder is installed at the bottom of the vehicle box, when the vehicle box has a large weight, it may cause a large friction between the first hinge shaft 22 and the support 21, a large friction between the ball head and the support plate 13, and a large friction between the second hinge shaft 24 and the crosshead assembly 23. Figure 1 Therefore, the present application provides an oil cup 6 on the support 21, the support plate 13 and the stabilizer 232 for improving the lubrication of the ball head, the first hinge shaft 22 and the second hinge shaft 24 during rotation. The oil discharge from the oil cup 6 can reduce the friction force when the ball head, the first hinge shaft 22 and the second hinge shaft 24 rotate, reduce mechanical loss and improve the smoothness of mechanical operation.

[0042] The implementation principle of a three-turn cylinder 1 in the embodiment of the present application is:

[0043] When cargo needs to be loaded and unloaded from the rear of the vehicle, when the telescopic end of the cylinder 1 is extended, with the cooperation of the outer ball head 11 and the second hinge shaft 24, the cylinder 1 swings in the crosshead assembly 23 with the second hinge shaft 24 as the rotation axis, thereby realizing the tilting of the vehicle box in the length direction of the vehicle, making it convenient to load and unload cargo from the rear of the vehicle.

[0044] When it is necessary to load and unload goods from both sides of the vehicle, the drive motor 31 is started, and the drive motor 31 drives the active gear 32 to rotate. Since the active gear 32 and the gear ring 34 are meshed with each other, the active gear 32 can drive the rotating ring 33 to rotate. When the rotating ring 33 rotates, the end of the second hinge shaft 24 away from the cylinder 1 moves in the annular groove 331, and since the annular groove 331 is inclined, when one of the two sets of second hinge shafts 24 has one end away from the cylinder 1 at the highest point, the other end away from the cylinder 1 is at the lowest point, thereby realizing the tilting of the cylinder 1 in the width direction of the vehicle, thereby realizing the tilting of the vehicle box in the width direction of the vehicle.

[0045] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] The above are all optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A three-turn oil cylinder, comprising an oil cylinder (1), characterized in that: An outer ball head (11) is arranged on the telescopic end of the oil cylinder (1), a support plate (13) is arranged at the bottom of the vehicle box, a connecting piece (12) for rotatably connecting the support plate (13) and the outer ball head (11) is arranged on the outer ball head (11) and the support plate (13), and a steering mechanism (2) is arranged on the oil cylinder (1) for rotating the oil cylinder (1) in three directions along the length and width directions of the vehicle.

2. A three-turn oil cylinder according to claim 1, characterized in that: The steering mechanism (2) comprises a support (21), a first hinge shaft (22), a crosshead assembly (23), a second hinge shaft (24) and a drive assembly (3); the support (21) is provided in two groups, the two groups of the support (21) are symmetrically arranged on both sides of the oil cylinder (1) along the length direction of the vehicle, the crosshead assembly (23) is arranged between the two groups of the support (21), the first hinge shaft (22) is provided in two groups, the two groups of the first hinge shaft (22) are symmetrically arranged on the crosshead assembly (23) ) and are rotatably connected to the two groups of supports (21), two groups of second hinge shafts (24) are provided, and the two groups of second hinge shafts (24) are symmetrically arranged on the side walls of the cylinder (1) along the width direction of the vehicle, and the crosshead assembly (23) is provided with a mounting groove (231), and the second hinge shaft (24) is rotatably arranged in the mounting groove (231), and the driving component (3) can make the second hinge shaft (24) tilt and drive the cylinder (1) to deflect in two width directions of the vehicle.

3. A three-turn oil cylinder according to claim 2, characterized in that: The driving assembly (3) comprises a driving motor (31), a driving gear (32), a rotating ring (33) and a gear ring (34); the driving motor (31) is arranged at the bottom of the vehicle, and the driving gear (32) is arranged on the output shaft of the driving motor (31); the rotating ring (33) is arranged at the bottom of the vehicle, and the gear ring (34) is arranged on the outer peripheral wall of the rotating ring (33); the driving gear (32) and the gear ring (34) are meshed with each other, and the rotating ring (33) is arranged on the outer peripheral wall of the rotating ring (33). An annular groove (331) is obliquely provided on the inner wall, and one end of the second hinge shaft (24) away from the oil cylinder (1) is slidably arranged in the annular groove (331). When the vehicle box is tilted at the maximum angle, the ends of the two groups of the second hinge shafts (24) away from the oil cylinder (1) are respectively located at the highest point and the lowest point in the annular groove (331), the oil cylinder (1) is located in the middle of the rotating ring (33), and the diameter of the rotating ring (33) is greater than the distance between the two groups of the supports (21).

4. A three-turn oil cylinder according to claim 3, characterized in that: Limit blocks (332) are provided at both the highest point and the lowest point in the annular groove (331).

5. The three-turn oil cylinder according to claim 2, characterized in that: The crosshead assembly (23) is provided with a stabilizing member (232) for improving the stability between the crosshead assembly (23) and the second hinge shaft (24).

6. A three-turn oil cylinder according to claim 3, characterized in that: An elastic telescopic rod (4) is provided at one end of the second hinge shaft (24) away from the oil cylinder (1), and the telescopic end of the elastic telescopic rod (4) is arranged in the annular groove (331).

7. A three-turn oil cylinder according to claim 6, characterized in that: A rotating cap (5) is rotatably provided at the end of the elastic telescopic rod (4) away from the oil cylinder (1), and the rotating cap (5) is rollingly provided in the annular groove (331).

8. The three-turn oil cylinder according to claim 5, characterized in that: The support seat (21), the support plate (13) and the stabilizing member (232) are provided with an oil cup (6) for improving the lubrication of the ball head, the first hinge shaft (22) and the second hinge shaft (24) during rotation.

Images