CN118855792A - A high-sealing hydraulic cylinder - Google Patents

Abstract

The invention discloses a high-sealing hydraulic oil cylinder, and particularly relates to the technical field of oil cylinders, which comprises a cylinder body, a piston rod, a first sealing ring, a movable plug, an arc-shaped supporting plate and a driving unit, wherein the driving unit is used for driving a plurality of arc-shaped supporting plates to move towards the radial outer direction of the piston when the movable plug moves towards the inner side direction of a sliding groove, so that the arc-shaped supporting plates support the first sealing ring tightly. Through setting up activity stopper and drive unit, after the oil pressure in the cylinder body increases to certain degree, activity stopper will be by its motion of drive unit drive, and then can drive the radial outside motion of arc fagging towards the piston for the arc fagging supports tight first sealing washer, and then makes first sealing washer be the state of strutting, makes first sealing washer and cylinder body inner wall support tight degree increase, makes like this that the junction of first sealing washer and cylinder body inner wall be difficult for producing to leak, avoids influencing the output pressure of pneumatic cylinder.

Description

A high-sealing hydraulic cylinder

Technical Field

The present invention relates to the technical field of oil cylinders, and more specifically, to a high-sealing hydraulic oil cylinder.

Background Art

As an adjustment system and force-providing system of the mechanical structure, the hydraulic cylinder can provide force support for the operation of mechanical parts on the mechanical mechanism. The operation of the hydraulic oil can make the piston in the hydraulic cylinder run, and the movement of mechanical parts can be controlled during the operation of the piston.

Chinese patent publication number CN219953797U discloses a high-sealing hydraulic cylinder. In this technical solution, the piston of the hydraulic cylinder is sealed with the inner wall of the cylinder body of the hydraulic cylinder by installing multiple sealing rings. Since the sealing rings may cause friction and wear with the inner wall of the cylinder body during long-term sliding use, the sealing performance of the sealing rings and the inner wall of the cylinder body is reduced. In particular, when the oil pressure increases, hydraulic oil may leak from the worn part of the piston, thereby causing the output pressure of the hydraulic cylinder to be unstable, affecting the normal use of the hydraulic cylinder.

Summary of the invention

In order to overcome the above defects of the prior art, an embodiment of the present invention provides a high-sealing hydraulic cylinder and a cleaning method thereof. The technical problem to be solved by the present invention is that after the piston of the hydraulic cylinder in the prior art is worn, the hydraulic oil may leak from the worn part.

To achieve the above object, the present invention provides the following technical solution: a high-sealing hydraulic cylinder, comprising a cylinder body, a piston and a piston rod of the hydraulic cylinder, wherein the piston rod is coaxially connected to the piston, the piston and the inner wall of the cylinder body form a sliding fit, and a first sealing ring installation groove is provided on the piston, a first sealing ring is installed in the first sealing ring installation groove, and further comprising:

A movable plug, wherein a blind hole-shaped sliding groove is coaxially provided on the end surface of the piston facing away from the piston rod, and the movable plug is engaged in the sliding groove and can slide freely;

Arc-shaped support plates, three of which are provided and are engaged in the annular mounting groove provided on the periphery of the piston, the annular mounting groove is connected with the first sealing ring mounting groove, the arc-shaped support plates are combined to form a circular ring structure, and the outer arc surface of the arc-shaped support plates is in contact with and connected to the inner ring hole wall of the first sealing ring;

A driving unit is used to drive the plurality of arc-shaped support plates to move toward the radially outer side of the piston when the movable plug moves toward the inner side of the sliding groove, thereby causing the arc-shaped support plates to tighten the first sealing ring.

Furthermore, the piston end surface is connected with an annular baffle corresponding to the sliding groove portion, and the inner ring hole diameter of the annular baffle is smaller than the inner diameter of the sliding groove.

Furthermore, the driving unit comprises:

A fixed short column, wherein the fixed short column is fixedly connected to the inner arc surface of the arc support plate, one end of the fixed short column away from the arc support plate penetrates into the sliding groove and slides freely, and a notch groove is provided on the periphery of the movable plug for the fixed short column to pass freely;

A sliding pin is passed through an end of the fixed short column away from the arc-shaped support plate. The inner wall of the notch groove is provided with a waist-shaped hole for the sliding pin to be inserted into. The length direction of the waist-shaped hole forms an angle with the axial direction of the movable plug.

Furthermore, a mounting hole is formed on an end surface of the movable plug away from the sliding slot, a retaining spring is installed in the mounting hole, and one end of the retaining spring passes through the mounting hole and abuts against the inner wall of the sliding slot.

Furthermore, a second sealing ring installation groove is respectively formed at two axial ends of the piston, a second sealing ring is installed in the second sealing ring installation groove, and the first sealing ring is located between the two second sealing rings.

Furthermore, a dustproof end cover is installed at one end of the cylinder body corresponding to the piston rod, the piston rod penetrates the dustproof end cover, and a sliding hole is coaxially opened on the dustproof end cover for the piston rod to pass freely.

Furthermore, two dustproof oil seal installation grooves are provided on the inner wall of the sliding hole of the dustproof end cover, and a dustproof oil seal is installed in each of the two dustproof oil seal installation grooves, and the dustproof oil seal is sleeved on the piston rod.

Furthermore, a cover plate is connected to one end of the piston facing the piston rod, a protrusion is fixed on the cover plate, the protrusion is coaxial with the piston rod, and a connecting rod is coaxially fixed to one end of the piston rod that penetrates into the cylinder body, and the connecting rod is rotatably connected to the protrusion.

Furthermore, a ball head is coaxially fixed to one end of the connecting rod away from the piston rod, a hemispherical groove for the ball head to engage is provided in the protruding portion, and the ball head is freely rotatable in the hemispherical groove.

Furthermore, a circular sleeve is coaxially fixed on the cover plate, the protrusion is located inside the circular sleeve, a conical sleeve is coaxially fixed on the circular sleeve, the outer diameter of the conical sleeve decreases successively in the direction away from the cover plate, and a jacket is coaxially fixed to the smallest end of the outer diameter of the conical sleeve, a deformation notch groove extending to the circular sleeve is provided on the jacket, the jacket is sleeved on the connecting rod, and the inner diameter of the jacket matches the outer diameter of the connecting rod, a fixing ring is coaxially fixed to the cylinder body, a conical groove is coaxially provided on one end of the fixing ring facing the jacket, and the conical groove is used in conjunction with the conical sleeve.

Technical effects and advantages of the present invention:

By providing a movable plug and a driving unit, when the oil pressure in the cylinder increases to a certain level, the movable plug will be driven by the driving unit to move, thereby driving the arc-shaped support plate to move radially outward from the piston, so that the arc-shaped support plate is pressed against the first sealing ring, thereby causing the first sealing ring to be in an open state, thereby increasing the degree of pressing between the first sealing ring and the inner wall of the cylinder body, thereby preventing leakage from easily occurring at the connection between the first sealing ring and the inner wall of the cylinder body, thereby avoiding affecting the output pressure of the hydraulic cylinder;

By setting a fixed short column and a sliding pin, when the hydraulic oil pressure in the cylinder body increases, the driving movable plug is moved in the sliding groove to overcome the elastic resisting force of the holding spring, so that the sliding pin slides in the waist-shaped hole, and the sliding pin moves from the lower end in the length direction of the waist-shaped hole toward the upper end in the length direction of the waist-shaped hole, thereby making the arc support plate move toward the radial outer side of the piston, so that the arc support plate can expand the first sealing ring, and make the first sealing ring and the inner wall of the cylinder body more tightly pressed, the structure is simple, and the tightness of the first sealing ring and the inner wall of the cylinder body can be adjusted in direct proportion to the change of the hydraulic oil pressure;

By providing a connecting rod and a protrusion, and the end of the connecting rod is rotatably connected to the protrusion, when the resistance on the piston rod generates a non-axial force on the piston rod, the piston rod can generate a very small swing, thereby preventing the piston from squeezing the inner wall of the cylinder body, thereby causing damage to the piston or the inner wall of the cylinder body when the piston reciprocates, and also preventing the first sealing ring and the second sealing ring from being squeezed and deformed by the inner wall of the cylinder body;

By arranging the jacket, the tapered sleeve, the annular sleeve and the fixing ring, when the piston rod approaches the end of the cylinder body and is subjected to a non-axial force, the jacket can produce a clamping force on the piston rod, thereby maintaining the stability of the piston rod. In addition, when the tapered sleeve is inserted into the tapered groove of the fixing ring, the piston rod is forced to be straightened, thereby preventing the piston rod from being subjected to a large extrusion and wear on the piston and the inner wall of the cylinder body when the piston rod is subjected to a non-axial force.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a high-sealing hydraulic cylinder in the present invention;

FIG2 is a schematic cross-sectional view of a portion of the structure in FIG1 ;

FIG3 is a schematic diagram of the structure of FIG1 after omitting the cylinder body;

FIG4 is a schematic diagram of an exploded decomposition of the structure in FIG3 ;

FIG5 is a schematic cross-sectional view of the structure in FIG3 ;

FIG6 is a schematic diagram of the structure of the movable plug, the arc support plate and the fixed short column after being assembled in the present invention;

FIG7 is a schematic diagram of an exploded view of the structure in FIG6 ;

FIG8 is a schematic diagram of the structure of the piston in the present invention;

FIG9 is a schematic cross-sectional view of the structure in FIG8 ;

FIG10 is a schematic diagram of the structure of the cover plate, the annular sleeve, the conical sleeve and the clamping sleeve after assembly in the present invention;

FIG. 11 is a schematic cross-sectional view of the structure in FIG. 10 .

The accompanying drawings are marked as follows: 1. cylinder body; 2. dustproof end cover; 3. piston rod; 4. dustproof oil seal; 5. fixing ring; 6. jacket; 7. tapered sleeve; 8. piston; 9. first sealing ring; 10. second sealing ring; 11. connecting rod; 12. annular baffle; 13. sliding groove; 14. annular sleeve; 15. deformation notch groove; 16. tapered groove; 17. ball head; 18. second sealing ring mounting groove; 19. movable plug; 20. notch groove; 21. fixed short column; 22. arc support plate; 23. tightening spring; 24. third sealing ring; 25. annular mounting groove; 26. protrusion; 27. sliding pin; 28. mounting hole; 29. waist-shaped hole; 30. first sealing ring mounting groove; 31. hemispherical groove.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

As shown in Figures 1 to 11, the present embodiment discloses: a high-sealing hydraulic cylinder, comprising a cylinder body 1, a piston 8 and a piston rod 3 of the hydraulic cylinder, a dustproof end cover 2 is installed at the front end of the cylinder body 1, and pipe interfaces are respectively provided at the front and rear ends of the cylinder body 1, and the two pipe interfaces are connected to the external hydraulic oil station through pipelines, and a sliding hole for the piston rod 3 to pass freely is provided on the dustproof end cover 2, and two dustproof oil seal installation grooves are provided in the hole wall of the sliding hole, and a dustproof oil seal 4 is installed in each of the two dustproof oil seal installation grooves, and the dustproof oil seal 4 is sleeved on the piston rod 3, and the piston rod 3 is coaxially connected to the piston 8, and the piston 8 forms a sliding fit with the inner wall of the cylinder body 1, and a first sealing ring installation groove 30 is provided on the piston 8, and a first sealing ring installation groove 30 is installed in the first sealing ring installation groove 30. A first sealing ring 9 is installed, and a second sealing ring installation groove 18 is opened at both axial ends of the piston 8. A second sealing ring 10 is installed in the second sealing ring installation groove 18. The first sealing ring 9 is located between the two second sealing rings 10. The width of the first sealing ring 9 is larger than the width of the second sealing ring 10. The end surface of the piston 8 is connected with an annular baffle 12 corresponding to the mouth of the sliding groove 13. The inner ring hole diameter of the annular baffle 12 is smaller than the inner diameter of the sliding groove 13. The first sealing ring 9 and the second sealing ring 10 are tightly fitted with the inner wall of the cylinder body 1, so that the piston 8 and the inner wall of the cylinder body 1 have a good sealing effect. The first sealing ring 9 is used as the main sealing element for sealing the piston 8 and the inner wall of the cylinder body 1, and the second sealing ring 10 is used as an auxiliary sealing element.

The piston 8 is coaxially provided with a blind hole sliding groove 13 on the end face of one side facing away from the piston rod 3, and a movable plug 19 is coaxially engaged in the sliding groove 13. The movable plug 19 slides freely in the sliding groove 13. In addition, a third sealing ring installation groove is provided around the movable plug 19, and a third sealing ring 24 is installed in the third sealing ring installation groove. The third sealing ring 24 is tightly fitted with the inner wall of the sliding groove 13, so that the movable plug 19 and the inner wall of the sliding groove 13 have a sealing effect. The edge of the annular mounting groove 25 is provided with three arc-shaped support plates 22, and the inner arc surface of the arc-shaped support plate 22 is in contact with the periphery of the annular mounting groove 25. After the inner arc surfaces of the three arc-shaped support plates 22 are engaged with the annular mounting groove 25, the three are combined into an annular structure. The annular mounting groove 25 is connected with the first sealing ring mounting groove 30. The arc-shaped support plates 22 are combined to form a circular ring structure, and the outer arc surface of the arc-shaped support plate 22 is in contact with the inner ring hole wall of the first and sealing rings 9. In addition, a mounting hole 28 is provided on one end of the movable plug 19 away from the mouth of the sliding groove 13, and a tightening spring 23 is installed in the mounting hole 28. One end of the tightening spring 23 passes through the mounting hole 28 and abuts against the inner wall of the sliding groove 13. In a natural state, the elastic pressing force of the tightening spring 23 drives the movable plug 19 to move toward the mouth of the sliding groove 13, and the end face of the movable plug 19 abuts against the end face of the annular baffle 12. The inner arc surface of the arc support plate 22 is welded with a fixed short The axial direction of the fixed short column 21 is perpendicular to the axial direction of the piston 8. The end of the fixed short column 21 away from the arc support plate 22 penetrates into the sliding groove 13 and slides freely. The peripheral edge of the movable plug 19 is provided with a notch groove 20 for the fixed short column 21 to pass freely. The end of the fixed short column 21 away from the arc support plate 22 is penetrated by a sliding pin 27. The inner wall of the notch groove 20 is provided with a waist-shaped hole 29 for the sliding pin 27 to be inserted. The length direction of the waist-shaped hole 29 forms an angle with the axial direction of the movable plug 19.

When the hydraulic cylinder is working, the pipe interface at the rear end of the cylinder body 1 is connected to the oil pump of the hydraulic oil station. The oil pump transports the hydraulic oil to the pipe interface at the rear end of the cylinder body 1, so that the oil pressure in the right space in the cylinder body 1 (refer to Figure 2) increases, and pushes the piston 8 to move toward the front end of the cylinder body 1, so that the piston rod 3 extends out of the cylinder body 1, thereby extending the piston rod 3 and driving the external device\equipment to operate. Under normal oil pressure conditions, the thrust of the hydraulic oil on the movable plug 19 is not greater than the elastic supporting force of the clamping spring 23 on the movable plug 19. At this time, the movable plug 19 has a small movement range in the sliding groove 13, and the sliding pin 27 is located at the end of the waist-shaped hole 29 adjacent to the radial inner side of the piston 8, and the first sealing ring 9 and the second sealing ring 10 can seal the piston 8 and the inner wall of the cylinder body 1. When the pressure of the hydraulic oil is too high, if After the first sealing ring 9 is worn out after long-term use, the hydraulic oil in the right space of the cylinder body 1 may penetrate into the left space of the cylinder body 1 through the worn part of the first sealing ring 9, resulting in unstable oil pressure in the cylinder body 1 and unstable output pressure of the piston rod 3. Therefore, in this embodiment, when the oil pressure in the right space of the cylinder body 1 increases to a certain level, the oil pressure will drive the movable plug 19 to move toward the inner side of the sliding groove 13, and make the sliding pin 27 slide in the waist-shaped hole 29, so that the sliding pin 27 drives the arc support plate 22 to move very slightly in the radial outer direction of the piston 8, so that the arc support plate 22 can tighten the first sealing ring 9, so that the first sealing ring 9 is more tightly pressed against the inner wall of the cylinder body 1, thereby improving the sealing degree between the first sealing ring 9 and the inner wall of the cylinder body 1;

In addition, after the piston rod 3 is extended, if the piston rod 3 is subjected to a non-axial force, the piston rod 3 will generate a torque on the piston 8, so that the edge of the end of the piston 8 squeezes the inner wall of the cylinder body 1, causing greater wear on the inner wall of the cylinder body 1, and may also cause the first sealing ring 9 and the second sealing ring 10 to be subjected to a greater extrusion force, affecting the service life of the first sealing ring 9 and the second sealing ring 10. Therefore, in this embodiment, a cover plate is screwed to the end of the piston 8 facing the piston rod 3, and a protrusion 26 is coaxially welded on the cover plate. A connecting rod 11 is coaxially welded on the end of the piston rod 3 that penetrates into the cylinder body 1, and the outer diameter of the connecting rod 11 is smaller than the outer diameter of the piston rod 3. A ball head 17 is coaxially welded on the end of the connecting rod 11 away from the piston rod 3. A hemispherical groove 31 is provided in the protrusion 26 for the ball head 17 to engage with. The ball head 17 rotates freely in the hemispherical groove 31. The ball head 17 rotates in the hemispherical groove 31, so that the connecting rod 11 is rotatably connected to the protrusion 26;

When the piston rod 3 is extended and subjected to a non-axial force, the ball head 17 rotates in the hemispherical groove 31 of the protrusion 26, which can offset the torque of the end of the piston rod 3 on the piston 8, thereby avoiding the piston 8 from exerting an extrusion force on the inner wall of the cylinder body 1, so that the inner wall of the cylinder body 1 will not exert a large extrusion wear on the first sealing ring 9 and the second sealing ring 10;

In addition, a circular sleeve 14 is coaxially welded on the cover plate, and the protrusion 26 is located in the circular sleeve 14. A conical sleeve 7 is coaxially fixed on the circular sleeve 14. The outer diameter of the conical sleeve 7 decreases in sequence in the direction away from the cover plate, and a jacket 6 is coaxially fixed on the smallest end of the outer diameter of the conical sleeve 7. The jacket 6 is provided with a deformation notch groove 15 extending to the circular sleeve 14. The jacket 6 is sleeved on the connecting rod 11, and the inner diameter of the jacket 6 matches the outer diameter of the connecting rod 11. A fixing ring 5 is coaxially fixed in the cylinder body 1, and a conical sleeve 5 is coaxially provided at one end of the fixing ring 5 facing the jacket 6. Groove 16, the conical groove 16 is used in conjunction with the tapered sleeve 7, that is, the tapered sleeve 7 can be engaged in the conical groove 16, and in the process of being engaged in the conical groove 16, the inner wall of the conical groove 16 generates an extrusion force along the radial inner side of the tapered sleeve 7 on the outer wall of the tapered sleeve 7, thereby causing the tapered sleeve 7 to produce elastic contraction, so that the sleeve 6 clamps the piston rod 3, so that the piston rod 3 can produce a certain degree of reaction force to the non-axial force it is subjected to, and thus can offset the non-axial force on the piston rod 3 to a certain extent, avoiding wear on the piston 8.

The working principle of the present invention is as follows: when the hydraulic cylinder is working, the pipe interface at the rear end of the cylinder body 1 is connected to the oil pump of the hydraulic oil station, and the oil pump delivers the hydraulic oil to the pipe interface at the rear end of the cylinder body 1, so that the oil pressure in the right space in the cylinder body 1 (refer to Figure 2) increases, and pushes the piston 8 to move toward the front end of the cylinder body 1, so that the piston rod 3 extends out of the cylinder body 1, thereby extending the piston rod 3 and driving the external device\equipment to operate. Under normal oil pressure conditions, the thrust of the hydraulic oil on the movable plug 19 is not greater than the elastic push force of the clamping spring 23 on the movable plug 19. At this time, the movable plug 19 has a small movement range in the sliding groove 13, and the sliding pin 27 is located at one end of the waist-shaped hole 29 adjacent to the radial inner side of the piston 8, and the first sealing ring 9 and the second sealing ring 10 can seal the piston 8 and the inner wall of the cylinder body 1. When the pressure of the hydraulic oil is too high, if the first sealing ring 9 is worn out after long-term use;

When the oil pressure in the right space of the cylinder body 1 rises to a certain level, the oil pressure will drive the movable plug 19 to move toward the inner side of the sliding groove 13, and make the sliding pin 27 slide in the waist-shaped hole 29, so that the sliding pin 27 drives the arc-shaped support plate 22 to move slightly toward the radial outer side of the piston 8, so that the arc-shaped support plate 22 can tighten the first sealing ring 9, so that the first sealing ring 9 is more tightly pressed against the inner wall of the cylinder body 1, thereby improving the sealing degree between the first sealing ring 9 and the inner wall of the cylinder body 1;

When the piston rod 3 is extended and subjected to non-axial force, the ball head 17 rotates in the hemispherical groove 31 of the protrusion 26 to offset the torque of the end of the piston rod 3 on the piston 8, thereby avoiding the piston 8 from generating an extrusion force on the inner wall of the cylinder body 1, so that the inner wall of the cylinder body 1 will not generate a large extrusion wear on the first sealing ring 9 and the second sealing ring 10. When the piston rod 3 is extended to the outside of the cylinder body 1, the tapered sleeve 7 will be engaged in the tapered groove 16. In the process of being engaged in the tapered groove 16, the inner wall of the tapered groove 16 generates an extrusion force along the radial inner side of the tapered sleeve 7 on the outer wall of the tapered sleeve 7, thereby causing the tapered sleeve 7 to produce elastic contraction, so that the sleeve 6 clamps the piston rod 3, so that the piston rod 3 can generate a certain degree of reaction force to the non-axial force it is subjected to, thereby offsetting the non-axial force on the piston rod 3 to a certain extent, avoiding wear on the piston 8, and reducing the stress concentration phenomenon at the connection between the piston 8 and the piston rod 3.

Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

Finally: The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a high seal hydraulic cylinder, includes hydraulic cylinder's cylinder body (1), piston (8) and piston rod (3), piston rod (3) coaxial coupling in on piston (8), piston (8) with cylinder body (1) inner wall constitutes sliding fit, just first sealing washer mounting groove (30) have been seted up on piston (8), install first sealing washer (9) in first sealing washer mounting groove (30), its characterized in that still includes:

The piston (8) is opposite to the end face of one side of the piston rod (3), a sliding groove (13) in a blind hole form is coaxially formed in the end face, and the movable plug (19) is clamped in the sliding groove (13) and slides freely;

The arc-shaped supporting plates (22) are arranged in three and are clamped in annular mounting grooves (25) formed in the periphery of the piston (8), the annular mounting grooves (25) are communicated with the first sealing ring mounting grooves (30), the arc-shaped supporting plates (22) are combined to form a circular ring structure, and the outer cambered surfaces of the arc-shaped supporting plates (22) are in contact connection with the inner ring hole walls of the first sealing ring and the sealing ring (9);

And the driving unit is used for driving a plurality of arc-shaped supporting plates (22) to move towards the radial outer direction of the piston (8) when the movable plug (19) moves towards the inner side direction of the sliding groove (13), so that the arc-shaped supporting plates (22) support the first sealing ring (9).

2. The high-sealing hydraulic cylinder according to claim 1, wherein an annular baffle plate (12) corresponding to the opening of the sliding groove (13) is connected to the end surface of the piston (8), and the aperture of an inner annular hole of the annular baffle plate (12) is smaller than the inner diameter of the sliding groove (13).

3. The high seal hydraulic ram of claim 1, wherein the drive unit comprises:

The fixing short column (21), the fixing short column (21) is fixedly connected to the inner cambered surface of the arc supporting plate (22), one end of the fixing short column (21) far away from the arc supporting plate (22) penetrates into the sliding groove (13) and slides freely, and a notch groove (20) for the fixing short column (21) to pass freely is formed in the periphery of the movable plug (19);

the sliding pin (27), the sliding pin (27) is worn to locate the fixed short column (21) is kept away from the one end of arc fagging (22), waist shape hole (29) that supplies sliding pin (27) were inserted are seted up to the inner wall in breach groove (20), the length direction in waist shape hole (29) with the axial of activity stopper (19) is the contained angle.

4. A high-sealing hydraulic cylinder according to claim 3, wherein a mounting hole (28) is formed in an end surface of the movable plug (19) away from the opening of the sliding groove (13), a tight-supporting spring (23) is mounted in the mounting hole (28), and one end of the tight-supporting spring (23) penetrating out of the mounting hole (28) is abutted against the inner wall of the sliding groove (13).

5. The high-sealing hydraulic cylinder according to claim 1, wherein second sealing ring mounting grooves (18) are respectively formed in two axial ends of the piston (8), second sealing rings (10) are mounted in the second sealing ring mounting grooves (18), and the first sealing ring (9) is located between the two second sealing rings (10).

6. The high-sealing hydraulic cylinder according to claim 1, wherein a dustproof end cover (2) is installed at one end of the cylinder body (1) corresponding to the piston rod (3), the piston rod (3) penetrates through the dustproof end cover (2), and a sliding hole for the piston rod (3) to freely pass through is coaxially formed in the dustproof end cover (2).

7. The high-sealing hydraulic cylinder according to claim 6, wherein two dustproof oil seal mounting grooves are formed in the inner wall of the sliding hole of the dustproof end cover (2), and dustproof oil seals (4) are respectively arranged in the two dustproof oil seal mounting grooves, and the dustproof oil seals (4) are sleeved on the piston rod (3).

8. The high-sealing hydraulic cylinder according to claim 1, wherein one end of the piston (8) facing the piston rod (3) is connected with a cover plate, a protruding part (26) is fixedly connected on the cover plate, the protruding part (26) is coaxial with the piston rod (3), one end of the piston rod (3) penetrating into the cylinder body (1) is coaxially fixedly connected with a connecting rod (11), and the connecting rod (11) is rotationally connected with the protruding part (26).

9. The high-sealing hydraulic cylinder according to claim 8, wherein a ball head (17) is coaxially and fixedly connected to one end of the connecting rod (11) far away from the piston rod (3), a hemispherical groove (31) for clamping the ball head (17) is formed in the protruding portion (26), and the ball head (17) freely rotates in the hemispherical groove (31).

10. The high-sealing hydraulic cylinder according to claim 8, wherein a circular ring sleeve (14) is coaxially fixedly connected to the cover plate, the protruding portion (26) is located in the circular ring sleeve (14), a conical sleeve (7) is coaxially fixedly connected to the circular ring sleeve (14), the outer diameter of the conical sleeve (7) decreases gradually towards the direction away from the cover plate, a jacket (6) is coaxially fixedly connected to the smallest outer diameter end of the conical sleeve (7), a deformation notch groove (15) extending to the circular ring sleeve (14) is formed in the jacket (6), the jacket (6) is sleeved on the connecting rod (11), the inner diameter of the jacket (6) is matched with the outer diameter of the connecting rod (11), a fixing ring (5) is coaxially fixedly connected to the cylinder body (1), a conical groove (16) is coaxially formed in one end of the fixing ring (5) towards the jacket (6), and the conical groove (16) is matched with the conical sleeve (7).