Pushing hydraulic cylinder for hydraulic support

Abstract

The utility model provides a pushing hydraulic cylinder for a hydraulic support, and belongs to the technical field of mineral supports, the pushing hydraulic cylinder comprises a cylinder body and a piston rod which are fixedly connected to the top of a base, the cylinder body is sleeved with a protective cover fixedly connected to the base, and the inner wall of the protective cover is slidably provided with a circumferential blocking grid used for shielding a heat dissipation opening in an attached mode. The base is provided with a ventilation adjusting component used for driving the circumferential blocking grid to rotate, the circumferential blocking grid is attached to the inner wall of the protective cover to slide through the ventilation adjusting component, and due to the fact that the circumferential blocking grid is a component formed by sequentially and circumferentially surrounding a plurality of baffles, after the circumferential blocking grid rotates, all the heat dissipation openings in the protective cover are closed at the same time. The heat dissipation opening is closed, so that the influence of the working environment on the cylinder body is avoided, in the telescopic movement process of the piston rod, the piston rod is protected through the dustproof cover, the piston rod is prevented from being influenced by the external environment, and therefore the protection effect on the piston rod is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of mineral supports, and particularly relates to a push hydraulic cylinder for a hydraulic support. Background Technique

[0002] During the coal mining process, the hydraulic support is one of the key devices to ensure the safe and efficient production of the coal mining face. As an important part of the hydraulic support, the push hydraulic cylinder is mainly used to realize the pushing of the hydraulic support and the movement of the scraper conveyor, and its performance directly affects the working efficiency and reliability of the hydraulic support.

[0003] A push hydraulic cylinder for a hydraulic support is disclosed in the related technology (publication number: CN220415424U), and the disclosed technical solution is as follows: A gap is left between the piston rod head and the stepped hole in the bottom of the cylinder. When the piston rod runs to the end, part of the oil in the piston block and the stepped hole in the bottom of the cylinder is sealed, forcing the oil to be squeezed out from the gap to form throttling and build back pressure to balance the impact inertia force, so that the piston block and the piston rod are braked, and the movement speed is gradually slowed down to zero, thereby avoiding the purpose of the piston block hitting the bottom of the cylinder and achieving a buffering effect.

[0004] In the above-mentioned disclosed technical solution, the following problems are found in the related technology: In the harsh working environment of the coal mine underground, the piston rod of the hydraulic cylinder is easily eroded and worn by impurities such as coal dust and rock debris, resulting in problems such as scratches and rust on the surface of the piston rod, which not only affects the sealing performance of the hydraulic cylinder, but also reduces the service life of the piston rod, increases the maintenance cost and downtime of the equipment. On the other hand, during the pushing process of the support by the hydraulic cylinder, the cylinder body part rotates frequently. Once the hydraulic oil pipe is affected during this period, it will cause hydraulic oil leakage. For this reason, we propose a new type of push hydraulic cylinder for a hydraulic support.

[0005] It should be noted that the information disclosed in the above background technology part is only used to strengthen the understanding of the background technology part of the present application, and therefore may include prior art information that does not constitute known to those of ordinary skill in the art. Content of the Utility Model

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art or related technologies. To solve the problem of the protection of the working environment of the hydraulic cylinder existing in the above-mentioned prior art, the utility model provides a push hydraulic cylinder for a hydraulic support, and adopts a working protection structure for the piston rod combined with a protection structure for the hydraulic oil pipe to achieve the effect of improving the protection of the hydraulic cylinder. The specific technical solution is as follows:

[0007] A push hydraulic cylinder for a hydraulic support, comprising a cylinder body and a piston rod fixedly connected to the top of the base. A protective cover fixedly connected to the base is sleeved outside the cylinder body. Heat dissipation openings are evenly formed in the circumferential direction on the outer wall of the protective cover. A circumferential grating for blocking the heat dissipation openings is slidably arranged in a fitting manner on the inner wall of the protective cover. And a ventilation adjustment member for driving the circumferential grating to rotate is arranged on the base. A dust-proof cover extending into the inner cavity of the circumferential grating is fixedly connected to the top of the outer wall of the piston rod.

[0008] In the above technical solution, an oil pipe interface penetrating through the inner cavity of the base is fixedly connected to the bottom of the cylinder body. One end of a movable column is rotatably connected to the outer wall of the oil pipe interface. An outer cylinder is sleeved outside the other end of the movable column. A limiting ring located below the oil pipe interface is fixedly connected to one side of the outer cylinder away from the movable column. A mounting seat is rotatably connected to the bottom of the base. A lifting member is arranged on the top of the mounting seat. And the lifting end of the lifting member is rotatably connected to the outer cylinder.

[0009] The lifting member includes a base frame fixedly connected to the top of the mounting seat. A guide groove is longitudinally formed on the base frame. The bottom of the side wall of the outer cylinder is rotatably connected to a movable frame. A threaded column penetrating through the inner cavity of the guide groove is fixedly connected to the side wall of the movable frame. A locking seat is threadedly connected to the outer wall of the threaded column. And the base frame is located between the locking seat and the movable frame.

[0010] Limiting seats are sleeved on both the upper and lower sides of the protective cover. Annular abutment seats are sleeved on both the upper and lower sides of the circumferential grating. The two limiting seats are respectively symmetrically attached to the opposite surfaces of the two annular abutment seats.

[0011] Support balls are evenly arranged in the circumferential direction between the limiting seat and the annular abutment seat on the same side.

[0012] The ventilation adjustment member includes a sector gear ring fixedly connected to the bottom of the outer wall of the circumferential grating. A through groove is formed in the bottom of the outer wall of the protective cover. The sector gear ring penetrates through the through groove and extends to the outside. A driving gear meshing with the sector gear ring is rotatably arranged on the outer wall of the base.

[0013] Guide seats are evenly fixedly connected to the circumferential direction of the outer wall of the cylinder body. Orientation grooves slidably arranged on the outer wall of the guide seats are evenly formed in the circumferential direction on the inner wall of the dust-proof cover.

[0014] The bottom of the dust-proof cover is of an open structure.

[0015] Compared with the prior art, the beneficial effects of the present utility model are: The push hydraulic cylinder for a hydraulic support:

[0016] 1. According to the laying position of the oil supply pipeline of the hydraulic cylinder, the position of the limit ring is adjusted by the lifting member. During the mineral construction process, when the hydraulic support is pushed, the cylinder body will rotate frequently with the mounting seat, which will affect the connection between the oil supply pipeline and the oil pipe interface. Therefore, it is necessary to lay the pipeline according to the rotation path of the oil supply pipeline. The bending points of the oil pipes are different at different installation positions. At this time, the position of the limit ring is adjusted by the lifting member to prevent the oil supply pipeline from being damaged due to frequent rotation, thereby protecting the oil supply pipeline. According to the fixed position of the oil supply pipeline, the bending points are adjusted, which ensures the stability of the hydraulic oil supply process.

[0017] 2. During the telescopic movement of the piston rod, the piston rod is protected by the dust cover to prevent the piston rod from being affected by the external environment, thereby protecting the piston rod.

[0018] 3. The circumferential grating is made to slide along the inner wall of the protective cover by the ventilation adjustment member. Since the circumferential grating is a member formed by a plurality of baffles surrounded circumferentially in sequence, when the circumferential grating rotates, all the heat dissipation openings on the protective cover are closed at the same time. During operation, by closing the heat dissipation openings, the working environment is prevented from affecting the cylinder body.

[0019] 4. By screwing the locking seat on the threaded column, the position of the movable frame on the base frame is adjusted, thereby adjusting the position of the outer cylinder. According to the position of the oil pipe, the length of the outer cylinder is adjusted to protect the oil pipe during the working process. Adjustment is made according to the position where the oil pipe is located, so that it can be applied to different working positions.

[0020] 5. During the process of adjusting the heat dissipation opening, the circumferential grating is made to slide along the inner wall of the protective cover. At the same time, the circumferential grating drives the annular abutment to rotate, and the annular abutment drives the support ball to slide along the inner wall of the chute, reducing the wear between the limit seat and the annular abutment, thereby preventing the circumferential grating from becoming loose over time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural view of a push hydraulic cylinder for a hydraulic support of the present invention Figure Ⅰ ;

[0022] Figure 2 is a schematic structural view of a push hydraulic cylinder for a hydraulic support of the present invention Figure Ⅱ ;

[0023] Figure 3 is an exploded schematic structural view of a push hydraulic cylinder for a hydraulic support of the present invention;

[0024] Figure 4 is a schematic structural view of the protective cover and the circumferential grating part of the present invention;

[0025] Figure 5 is Figure 1 a partial enlarged view of part A of

[0026] Figure 6 is Figure 2 a partial enlarged view of part B of

[0027] Among them, Figures 1 to 6 the corresponding relationship between the reference numerals and the component names in Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Next, in combination with specific implementation cases and attached Figure 1 - attached Figure 6 the present invention will be further described, but the present invention is not limited to these embodiments.

[0030] A push hydraulic cylinder for a hydraulic support includes a cylinder block 1 and a piston rod 2 fixedly connected to the top of a base 7. The base 7 is fixedly installed on the top of the cylinder block 1. A cylindrical protective cover 3 is sleeved outside the cylinder block 1. The bottom of the outer wall of the protective cover 3 is fixedly suspended on the base 7 through a semi-circular fixing rod 11. The two ends of the fixing rod 11 are respectively fixed on the bottom of the outer wall of the protective cover 3 and the circumferential outer wall of the base 7, so that there is a certain movable space between the bottom of the protective cover 3 and the base 7. This movable space is the space reserved for the installation of the circumferential retaining grid 5. A protective cover 3 fixedly connected to the base 7 is sleeved outside the cylinder block 1, and heat dissipation ports 4 are evenly arranged circumferentially on the outer wall of the protective cover 3. The heat dissipation ports 4 are arranged circumferentially on the outer wall of the protective cover 3 in sequence, so that the cylinder block 1 ventilates with the external environment through the heat dissipation ports 4.

[0031] A circumferential grating 5 for blocking the heat dissipation port 4 is slidably arranged in a fitting manner on the inner wall of the protective cover 3, and a ventilation adjustment member for driving the circumferential grating 5 to rotate is arranged on the base 7. The circumferential grating 5 is made to slide along the inner wall of the protective cover 3 by the ventilation adjustment member. Since the circumferential grating 5 is a member formed by a plurality of baffles circumferentially arranged in sequence, when the circumferential grating 5 rotates, all the heat dissipation ports 4 on the protective cover 3 are simultaneously closed. During operation, by closing the heat dissipation ports 4, the working environment is prevented from affecting the cylinder block 1.

[0032] A dust-proof cover 6 extending into the inner cavity of the circumferential grating 5 is fixedly connected to the top of the outer wall of the piston rod 2. The dust-proof cover 6 is of a cylindrical structure. The top of the dust-proof cover 6 is fixedly sleeved on the top of the outer wall of the piston rod 2, so that the dust-proof cover 6 moves along with the top end of the piston rod 2. The outer wall of the dust-proof cover 6 slides in a fitting manner on the inner wall of the circumferential grating 5, ensuring the stability of the dust-proof cover 6 during the movement along with the piston rod 2. During the telescopic movement of the piston rod 2, the piston rod 2 is protected by the dust-proof cover 6 to avoid being affected by the external environment, thus playing a protective effect on the piston rod 2.

[0033] Among them, an oil pipe interface 8 penetrating through the inner cavity of the base 7 is fixedly connected to the bottom of the cylinder block 1. The oil pipe interface 8 is fixedly embedded and installed at the bottom of the cylinder block 1, so that the oil pipe interface 8 is communicated with the inner cavity of the cylinder block 1. One end of a movable column 9 is rotatably connected to the outer wall of the oil pipe interface 8. The other end of the movable column 9 is externally sleeved with an outer cylinder 10. A limiting ring 13 located below the oil pipe interface 8 is fixedly connected to one side of the outer cylinder 10 away from the movable column 9. The outer cylinder 10 slides telescopically along the outer wall of the movable column 9, so that the movable column 9 and the outer cylinder 10 form a telescopic structure. The upper ends of the two movable columns 9 are respectively hinged to the oil pipe interface 8 symmetrically left and right. A limiting ring 13 is fixedly installed between the two outer cylinders 10, and the limiting ring 13 is located at the lowermost part of the outer cylinder 10. The hydraulic oil pipeline passes through the limiting ring 13 and is hermetically docked with the oil pipe interface 8. The bottom of the base 7 is rotatably connected to a mounting seat 12. A lifting member is arranged on the top of the mounting seat 12, and the lifting end of the lifting member is rotatably connected to the outer cylinder 10.

[0034] According to the position where the hydraulic cylinder oil supply pipeline is laid, the position of the limiting ring 13 is adjusted by the lifting member. Since during the mineral construction process of the hydraulic cylinder, when pushing the hydraulic support, the cylinder block 1 part will rotate frequently with the mounting seat 12, resulting in an impact on the connection between the oil supply pipeline and the oil pipe interface 8. Therefore, it is necessary to lay the pipeline according to the rotation path of the oil supply pipeline. The bending points of the oil pipes are different at different installation positions. At this time, the position of the limiting ring 13 is adjusted by the lifting member to avoid damage to the oil supply pipeline caused by frequent rotation, thus playing a protective effect on the oil supply pipeline. According to the fixed position of the oil supply pipeline, the bending points are adjusted, thereby ensuring the stability of the hydraulic oil supply process.

[0035] It should be noted that the lifting member includes a base frame 14 fixedly connected to the top of the mounting base 12. A guide groove 17 is longitudinally formed on the base frame 14. Two base frames 14 are vertically and fixedly arranged on the top of the mounting base 12 in parallel, and a guide groove 17 penetrating the inner cavity is longitudinally formed on the two base frames 14. The bottom of the side wall of the outer cylinder 10 is rotatably connected with a movable frame 15. The bottom of the side wall of the outer cylinder 10 rotates on the movable frame 15 through a rotating shaft. A threaded column 18 is vertically fixed on the outer surface of the movable frame 15 facing the outside, and the threaded column 18 passes through the guide groove 17. A threaded column 18 penetrating the inner cavity of the guide groove 17 is fixedly connected to the side wall of the movable frame 15. The outer wall of the threaded column 18 is threadedly connected with a locking seat 19, and the base frame 14 is located between the locking seat 19 and the movable frame 15. The two movable frames 15 are fixedly connected by an annular rod 16 with a radius larger than the limiting ring 13, so that the two movable frames 15 move simultaneously.

[0036] By screwing the locking seat 19 on the threaded column 18, the position of the movable frame 15 on the base frame 14 is adjusted, so as to adjust the position of the outer cylinder 10. The length of the outer cylinder 10 is adjusted according to the position of the oil pipe, which plays a protective role in the working process of the oil pipe. It is adjusted according to the position where the oil pipe is located, and thus can be applied to different working positions.

[0037] In addition, limiting seats 28 are sleeved on both the upper and lower sides of the protective cover 3, and annular abutting seats 26 are sleeved on both the upper and lower sides of the circumferential grating 5. The two limiting seats 28 are symmetrically attached to the opposite surfaces of the two annular abutting seats 26 respectively. The annular abutting seat 26 slides between the limiting seat 28 and the base 7. The two annular limiting seats 28 are fixedly sleeved at both ends of the protective cover 3 through the formed mounting holes respectively.

[0038] The two annular abutting seats 26 are fixedly sleeved at both ends of the circumferential grating 5 through the formed mounting holes at the centers respectively, so that the upper limiting seat 28 slides below the upper annular abutting seat 26, and at the same time the lower limiting seat 28 slides above the lower annular abutting seat 26. By clamping the two annular abutting seats 26 between the two limiting seats 28, the stability of the rotation adjustment process of the circumferential grating 5 is ensured.

[0039] In addition, support balls 27 are evenly arranged circumferentially between the limiting seat 28 and the annular abutting seat 26 on the same side. Slide grooves 22 are circumferentially formed on the opposite surfaces of the two limiting seats 28, and support balls 27 are sequentially and circumferentially fixedly installed on the opposite surfaces of the two annular abutting seats 26.

[0040] During the process of adjusting the heat dissipation port 4, the circumferential grating 5 slides on the inner wall of the protective cover 3. At the same time, the circumferential grating 5 drives the annular abutting seat 26 to rotate, so that the annular abutting seat 26 drives the support ball 27 to slide on the inner wall of the slide groove 22, reducing the wear between the limiting seat 28 and the annular abutting seat 26, and thus avoiding the loosening of the circumferential grating 5 after a long time.

[0041] Furthermore, the ventilation adjusting member includes a sector gear ring 20 fixedly connected to the bottom of the outer wall of the circumferential grille 5. A through groove 21 is provided at the bottom of the outer wall of the protective cover 3, and the sector gear ring 20 penetrates through the through groove 21 and extends to the outside. The circumferential length of the through groove 21 is greater than the circumferential length of the sector gear ring 20, and the length of the through groove 21 ensures that the circumferential grille 5 can close the heat dissipation port 4 after rotation. A driving gear 23 meshing with the sector gear ring 20 is rotatably arranged on the outer wall of the base 7. The motor is fixed on the outer circumferential wall of the base 7 through a machine cover. The driving gear 23 is fixedly sleeved on the outer wall of the output shaft of the motor through a mounting hole provided at the center. The motor is connected to an external power supply through a wire.

[0042] The output shaft of the motor drives the driving gear 23 to rotate, so that the sector gear ring 20 meshing with the driving gear 23 drives the circumferential grille 5 to rotate in the through groove 21, thereby adjusting the size of the heat dissipation port 4.

[0043] Guide seats 25 are fixedly connected to the outer wall of the cylinder block 1 at equal intervals in the circumferential direction. Orientation grooves 24 for sliding on the outer walls of the guide seats 25 are provided at equal intervals in the circumferential direction on the inner wall of the dust-proof cover 6. The orientation grooves 24 extend out of the bottom of the dust-proof cover 6.

[0044] When the dust-proof cover 6 moves back and forth with the telescopic movement of the piston rod 2, the dust-proof cover 6 drives the orientation grooves 24 to slide on the outer walls of the guide seats 25. Through the sliding fit between the guide seats 25 and the orientation grooves 24, the stability of the dust-proof cover 6 is improved, and position deviation is avoided, thereby ensuring the protection of the piston rod 2.

[0045] The bottom of the dust-proof cover 6 is of an open structure, so that the bottom of the dust-proof cover 6 communicates with the inside of the circumferential grille 5. When the circumferential grille 5 rotates and the heat dissipation port 4 is opened, the space where the piston rod 2 is located communicates with the external environment, so that the hydraulic cylinder is cooled after operation.

[0046] In this embodiment, for the push hydraulic cylinder of the hydraulic support, the working principle is as follows: when the oil pipe interface 8 of the hydraulic cylinder is connected to the oil supply pipeline, the oil supply pipeline passes through the limit ring 13 and is hermetically docked with the oil pipe interface 8. Then, during the laying process of the oil supply pipeline, the threaded column 18 slides in the guide groove 17, so that the movable frame 15 slides on the base frame 14, and the movable frame 15 drives the outer cylinder 10 to slide on the outer wall of the movable column 9. After adjusting the limit ring 13 to a suitable position, the locking seat 19 is screwed on the threaded column 18.

[0047] Subsequently, when the hydraulic support is pushed during the mineral construction, the output shaft of the motor drives the driving gear 23 to rotate, so that the sector gear ring 20 meshing with the driving gear 23 drives the circumferential grille 5 to rotate in the through groove 21, and the heat dissipation port 4 is closed. Then the hydraulic cylinder is started, and the piston rod 2 drives the dust-proof cover 6 to extend and work.

[0048] After the construction is completed, the piston rod 2 is retracted into the cylinder block 1, so that the dust cover 6 is retracted into the inner part of the circumferential grating 5. At this time, the output shaft of the motor drives the driving gear 23 to rotate again, so that the sector gear ring 20 meshing with the driving gear 23 drives the circumferential grating 5 to rotate in the through groove 21, and the heat dissipation port 4 is opened.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0050] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0051] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder for a hydraulic support, comprising a cylinder body (1) fixed to the top of a base (7) and a piston rod (2), characterized in that: The cylinder body (1) is sleeved with a protective cover (3) fixedly connected to the base (7), the outer wall of the protective cover (3) is provided with heat dissipation openings (4) uniformly arranged in the circumferential direction, the inner wall of the protective cover (3) is provided with a circumferential barrier (5) for shielding the heat dissipation openings (4) in a sliding manner, and the base (7) is provided with a ventilation adjustment component for driving the circumferential barrier (5) to rotate, and the top of the outer wall of the piston rod (2) is fixedly connected with a dust cover (6) extending into the inner cavity of the circumferential barrier (5).

2. The hydraulic cylinder for a hydraulic support according to claim 1, characterized in that: The bottom of the cylinder body (1) is fixedly connected to an oil pipe interface (8) which passes through the inner cavity of the base (7); the outer wall of the oil pipe interface (8) is rotatably connected to one end of a movable column (9); the outer wall of the other end of the movable column (9) is sleeved with an outer cylinder (10); a side of the outer cylinder (10) away from the movable column (9) is fixedly connected to a limit ring (13) located below the oil pipe interface (8); the bottom of the base (7) is rotatably connected to a mounting seat (12); a lifting component is arranged on the top of the mounting seat (12); and the lifting end of the lifting component is rotatably connected to the outer cylinder (10).

3. The hydraulic cylinder for a hydraulic support according to claim 2, characterized in that: The lifting component comprises a base frame (14) fixedly connected to the top of the mounting seat (12), a guide groove (17) being longitudinally provided on the base frame (14), a movable frame (15) being rotatably connected to the bottom of the side wall of the outer cylinder (10), a threaded column (18) penetrating the inner cavity of the guide groove (17) being fixedly connected to the side wall of the movable frame (15), a locking seat (19) being threadedly connected to the outer wall of the threaded column (18), and the base frame (14) being located between the locking seat (19) and the movable frame (15).

4. The hydraulic cylinder for a hydraulic support according to claim 1, characterized in that: The upper and lower sides of the protective cover (3) are sleeved with limit seats (28), the upper and lower sides of the circumferential barrier (5) are sleeved with annular retaining seats (26), and the two limit seats (28) are symmetrically fitted on the opposite surfaces of the two annular retaining seats (26).

5. The hydraulic cylinder for hydraulic support according to claim 4, characterized in that: Support balls (27) are evenly arranged in the circumferential direction between the limiting seat (28) and the annular stop seat (26) located on the same side.

6. The hydraulic cylinder for a hydraulic support according to claim 1, characterized in that: The ventilation adjustment component comprises a sector gear ring (20) fixedly connected to the bottom of the outer wall of the circumferential barrier (5); a through slot (21) is provided at the bottom of the outer wall of the protective cover (3); the sector gear ring (20) passes through the through slot (21) and extends to the outside; and a driving gear (23) meshing with the sector gear ring (20) is rotatably provided on the outer wall of the base (7).

7. The hydraulic cylinder for a hydraulic support according to claim 1, characterized in that: The outer wall of the cylinder body (1) is evenly fixedly connected with a guide seat (25) in the circumferential direction, and the inner wall of the dust cover (6) is evenly provided with a directional groove (24) slidably arranged on the outer wall of the guide seat (25).

8. The hydraulic cylinder for a hydraulic support according to claim 1, characterized in that: The bottom of the dust cover (6) is an open structure.

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