CN115596736A

CN115596736A - High-stability self-locking oil cylinder

Info

Publication number: CN115596736A
Application number: CN202211410195.8A
Authority: CN
Inventors: 徐飞龙
Original assignee: Taixing Ouman Hydraulic Technology Co ltd
Current assignee: Taixing Ouman Hydraulic Technology Co ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-01-13

Abstract

The invention discloses a high-stability self-locking oil cylinder, which relates to the technical field of oil cylinders and comprises a cylinder body, an upper end cover, a lower end cover and a piston rod, wherein a fixed top plate is fixedly arranged on the upper end cover, a fixed bottom plate is fixedly arranged on the lower end cover, a fixed shell is fixedly arranged on the fixed top plate, a plurality of elastic telescopic rods are fixedly arranged on the fixed shell, one end of each elastic telescopic rod is fixedly connected with a locking rod, a plurality of locking holes are formed in the outer peripheral surface of the piston rod and correspond to the locking rods one by one, the locking holes and the locking rods are matched components, an extrusion groove, a guide groove and a corresponding transmission structure are arranged on the piston body, when pressure retaining valves on a first medium through pipe and a second medium through pipe leak, the wedge-shaped guide block is inserted into the wedge-shaped clamping groove through the matching of the extrusion block and the wedge-shaped guide block to self-lock the piston body descending due to gravity, and the dangerous situation caused by the continuous descending of the piston body is avoided.

Description

High-stability self-locking oil cylinder

Technical Field

The invention relates to the technical field of oil cylinders, in particular to a high-stability self-locking oil cylinder.

Background

The cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). When the oil cylinder is used for realizing reciprocating motion, a speed reduction device can be omitted, a transmission gap is not formed, the motion is stable, and the reciprocating motion hydraulic system is widely applied to various hydraulic systems.

When the piston rod on the oil cylinder needs to be fixed, the pressure retaining valve on the medium channel needs to be closed, and the medium pressure inside the oil cylinder is ensured to be stable. However, this method is not very reliable, and if a medium leaks, the piston rod may fall due to gravity, which is very dangerous, so a self-locking structure needs to be installed on the cylinder to prevent the piston rod from continuously falling to the bottom. The existing self-locking oil cylinder is not high in stability, only single locking of a piston body is considered, and when a locking structure goes wrong, the piston rod can still continuously descend, so that a dangerous condition is caused.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a high-stability self-locking oil cylinder.

In order to achieve the purpose, the invention provides the following technical scheme:

a high-stability self-locking oil cylinder comprises a cylinder body, an upper end cover, a lower end cover and a piston rod, wherein a fixed top plate is fixedly installed on the upper end cover, a fixed bottom plate is fixedly installed on the lower end cover, a fixed shell is fixedly installed on the fixed top plate, a plurality of elastic telescopic rods are fixedly installed on the fixed shell, one end of each elastic telescopic rod is fixedly connected with a locking rod, a plurality of locking holes are formed in the outer peripheral surface of the piston rod, the locking holes correspond to the locking rods one to one, and the locking holes and the locking rods are matched components;

a first medium port and a second medium port are formed in the cylinder body, a first medium through pipe is fixedly installed on one side of the first medium port, and a second medium through pipe is fixedly installed on one side of the second medium port;

the bottom of the piston rod is fixedly provided with a piston plate, the piston plate is arranged in the cylinder body, the bottom of the piston plate is fixedly provided with a moving rod, a piston body is arranged below the piston plate, the moving rod penetrates through the top of the piston body in a sliding manner, an extrusion groove is formed in the piston body, the bottom of the moving rod is fixedly provided with an extrusion block, the extrusion block is arranged in the extrusion groove in a sliding manner, a guide groove is formed in the piston body, two wedge-shaped guide blocks are arranged in the guide groove in a sliding manner, the extrusion groove is communicated with the guide groove, the inner wall of the cylinder body is provided with two wedge-shaped clamping grooves, the two wedge-shaped guide blocks correspond to the two wedge-shaped clamping grooves one by one, and the wedge-shaped guide blocks and the wedge-shaped clamping grooves are matched components;

the oil cylinder is characterized in that a first oil cavity and a third oil cavity are formed in the bottom of the cylinder body, a second oil cavity is formed in the lower end cover, one end of the first oil cavity is fixedly connected with the second oil cavity, one end of the first oil cavity is far away from the second oil cavity and is fixedly connected with the third oil cavity, an auxiliary cavity is formed in the inner wall of the cylinder body, one end of the third oil cavity is far away from the second oil cavity and is fixedly connected with the auxiliary cavity, an expansion spring is fixedly mounted in the auxiliary cavity, one end of the expansion spring is fixedly connected with the inner wall of the auxiliary cavity, the other end of the expansion spring is fixedly connected with an auxiliary positioning rod, the auxiliary positioning rod slidably penetrates through the auxiliary cavity, an auxiliary positioning groove is formed in the piston body, and the auxiliary positioning rod and the auxiliary positioning groove are matched components.

Further, the upper end cover is fixedly installed at the top of the cylinder body, and the lower end cover is fixedly installed at the bottom of the cylinder body.

Furthermore, a plurality of fixing rods are fixedly arranged between the fixing top plate and the fixing bottom plate.

Further, the fixed shell is fixedly installed on the upper surface of the fixed top plate.

Further, radian fixed mounting such as a plurality of elasticity telescopic links is on the set casing, a plurality of through-holes have been seted up to radian such as on the set casing, a plurality of through-holes and a plurality of elasticity telescopic link one-to-one, and radians such as a plurality of locking holes are seted up in the piston rod outer peripheral face.

Further, first medium mouth, second medium mouth are seted up in the cylinder body homonymy, first medium mouth sets up in second medium mouth top, second medium mouth sets up in wedge-shaped draw-in groove below, all install the pressure retaining valve on first medium siphunculus and the second medium siphunculus.

Furthermore, two wedge guide blocks are respectively arranged on two sides of the extrusion block, and two wedge clamping grooves are respectively arranged on the inner walls of two sides of the cylinder body.

Further, the working process of the self-locking oil cylinder is as follows:

the method comprises the following steps: when the piston rod needs to descend, otherwise, the piston plate descends under the action of the external medium, and then the piston rod descends;

step two: when the piston rod needs to be fixed, the pressure retaining valves on the first medium through pipe and the second medium through pipe are closed, the piston rod is fixed, when the pressure retaining valve leaks, the piston rod descends under the action of gravity, when the wedge-shaped guide block on the piston body moves to the position of the wedge-shaped clamping groove, the piston rod extrudes the piston plate under the action of gravity, the piston plate extrudes the movable rod, the movable rod extrudes the extrusion block, the extrusion block further slides downwards in the extrusion groove, the extrusion block then enters the guide groove to extrude the two wedge-shaped guide blocks, the two wedge-shaped guide blocks move towards two sides along the guide groove under the action of the extrusion block, so that the wedge-shaped guide blocks are inserted into the corresponding wedge-shaped clamping grooves, meanwhile, the piston body extrudes the medium at the bottom of the cylinder body into the first oil cavity, then the medium enters the second oil cavity through the first oil cavity, and then the medium enters the third oil cavity through the second oil cavity, the medium in the third oil cavity enters the auxiliary cavity to extrude the auxiliary positioning rod, the auxiliary positioning rod pulls the expansion spring, the auxiliary positioning rod is inserted into the auxiliary positioning groove, the piston body stops moving, the extrusion groove, the guide groove and the corresponding transmission structure are arranged on the piston body, when the pressure retaining valves on the first medium through pipe and the second medium through pipe leak, the wedge-shaped guide block is inserted into the wedge-shaped groove through the matching of the extrusion block and the wedge-shaped guide block to carry out self-locking on the piston body descending due to gravity, so that the dangerous situation caused by the continuous descending of the piston body is avoided, the auxiliary cavity is arranged, the expansion spring and the auxiliary positioning rod are arranged in the auxiliary cavity, the medium at the bottom of the cylinder body is extruded into the auxiliary cavity in the descending process of the piston body, the auxiliary positioning rod is also inserted into the auxiliary positioning groove when the wedge-shaped guide block is inserted into the wedge-shaped groove, the auxiliary positioning rod is matched with the auxiliary positioning groove to perform auxiliary fixing on the piston body, so that the self-locking stability of the piston body is ensured;

step three: at the moment, the locking holes move to one side of the corresponding locking rods, the elastic telescopic rods push the locking rods to be inserted into the corresponding locking holes to complete locking, after the piston body completes self-locking, the locking holes in the fixed shell move to one side of the corresponding locking rods, the elastic telescopic rods push the locking rods to be inserted into the corresponding locking holes to complete self-locking on the piston rods, and then self-locking on the whole oil cylinder structure is completed from top to bottom.

Compared with the prior art, the invention has the following beneficial effects:

1. the extrusion groove, the guide groove and the corresponding transmission structure are arranged on the piston body, so that when the pressure retaining valves on the first medium through pipe and the second medium through pipe leak, the wedge-shaped guide block is inserted into the wedge-shaped clamping groove through the matching of the extrusion block and the wedge-shaped guide block to self-lock the piston body which descends due to gravity, and the dangerous condition caused by the continuous descending of the piston body is avoided;

2. set up supplementary chamber, and set up expanding spring and assistance-localization real-time pole in supplementary intracavity, the decline in-process of piston body extrudees the medium of cylinder body bottom to supplementary intracavity, assistance-localization real-time pole also inserts in the assistance-localization real-time pole in the wedge draw-in groove when inserting until the wedge guide block, assistance-localization real-time pole carries out the auxiliary fixation to the piston body with the cooperation of assistance-localization real-time pole, guarantee the stability of piston body auto-lock, accomplish the auto-lock back at the piston body, the locking hole on the set casing removes to locking lever one side that corresponds, elasticity telescopic link promotes in the locking lever inserts the locking hole that corresponds, the auto-lock is accomplished to the piston rod, and then from the top down accomplishes the auto-lock to whole hydro-cylinder structure, and the auto-lock mode of many places combines, the stability of hydro-cylinder auto-lock is greatly improved.

Drawings

FIG. 1 is a schematic structural view of a high-stability self-locking oil cylinder;

FIG. 2 is a cross-sectional view of the cylinder of the present invention;

FIG. 3 is a drawing of FIG. 2 of the present invention enlargement at point A;

FIG. 4 is an enlarged view taken at B of FIG. 2 in accordance with the present invention;

fig. 5 is an internal structural view of the set cover of the present invention.

100. A cylinder body; 101. an upper end cover; 102. a lower end cover; 103. a piston rod; 104. a locking hole; 105. a first medium through pipe; 106. a second medium through pipe; 107. a first media port; 108. a second media port; 109. a piston plate; 110. a travel bar; 1101. a piston body; 1102. an auxiliary positioning groove; 111. extruding the block; 112. extruding a groove; 113. a guide groove; 114. a wedge-shaped guide block; 115. a wedge-shaped clamping groove; 116. a first oil chamber; 117. a second oil chamber; 118. a third oil chamber; 119. an auxiliary chamber; 120. a tension spring; 121. an auxiliary positioning rod; 200. fixing the bottom plate; 201. a fixing rod; 202. fixing a top plate; 203. a stationary case; 204. an elastic telescopic rod; 205. a locking lever; 206. and a through hole.

Detailed Description

Example 1

Referring to fig. 1 to 4, a high-stability self-locking oil cylinder includes a cylinder body 100, an upper end cover 101, a lower end cover 102, and a piston rod 103, wherein a fixed top plate 202 is fixedly installed on the upper end cover 101, a fixed bottom plate 200 is fixedly installed on the lower end cover 102, and a fixed shell 203 is fixedly installed on the fixed top plate 202. A plurality of fixing rods 201 are fixedly installed between the fixing top plate 202 and the fixing bottom plate 200. The fixed case 203 is fixedly mounted on the upper surface of the fixed top plate 202. The upper end cover 101 is fixedly installed on the top of the cylinder body 100, and the lower end cover 102 is fixedly installed on the bottom of the cylinder body 100. The cylinder block 100 is provided with a first medium port 107 and a second medium port 108, a first medium through pipe 105 is fixedly installed on one side of the first medium port 107, and a second medium through pipe 106 is fixedly installed on one side of the second medium port 108. The first medium port 107 and the second medium port 108 are arranged on the same side of the cylinder body 100, the first medium port 107 is arranged above the second medium port 108, the second medium port 108 is arranged below the wedge-shaped clamping groove 115, and the first medium through pipe 105 and the second medium through pipe 106 are both provided with pressure retaining valves. Piston rod 103 bottom fixed mounting has piston plate 109, piston plate 109 sets up in cylinder body 100, piston plate 109 bottom fixed mounting has carriage release lever 110, piston plate 109 below is provided with piston body 1101, carriage release lever 110 slides and runs through piston body 1101 top, extrusion groove 112 has been seted up in the piston body 1101, carriage release lever 110 bottom fixed mounting has extrusion piece 111, extrusion piece 111 slidable mounting is in extrusion groove 112, guide way 113 has been seted up in piston body 1101, slidable mounting has two wedge guide blocks 114 in the guide way 113, extrusion groove 112 is linked together with guide way 113, two wedge draw-in grooves 115 have been seted up to the cylinder body 100 inner wall, two wedge guide blocks 114 and two wedge draw-in grooves 115 one-to-one, wedge guide block 114 and wedge draw-in groove 115 are the cooperation member. The two wedge-shaped guide blocks 114 are respectively arranged at two sides of the extrusion block 111, and the two wedge-shaped clamping grooves 115 are respectively arranged on the inner walls at two sides of the cylinder body 100. The extrusion groove 112, the guide groove 113 and the corresponding transmission structure are arranged on the piston body 1101, so that when pressure retaining valves on the first medium through pipe 105 and the second medium through pipe 106 leak, the wedge-shaped guide block 114 is inserted into the wedge-shaped clamping groove 115 through the matching of the extrusion block 111 and the wedge-shaped guide block 114 to self-lock the piston body 1101 which descends due to gravity, and the dangerous situation caused by the continuous descending of the piston body 1101 is avoided.

The bottom of the cylinder body 100 is provided with a first oil cavity 116 and a third oil cavity 118, a second oil cavity 117 is formed in the lower end cover 102, one end of the first oil cavity 116 is fixedly connected with the second oil cavity 117, one end of the second oil cavity 117, which is far away from the first oil cavity 116, is fixedly connected with the third oil cavity 118, an auxiliary cavity 119 is formed in the inner wall of the cylinder body 100, one end of the third oil cavity 118, which is far away from the second oil cavity 117, is fixedly connected with the auxiliary cavity 119, an extension spring 120 is fixedly installed in the auxiliary cavity 119, one end of the extension spring 120 is fixedly connected with the inner wall of the auxiliary cavity 119, the other end of the extension spring 120 is fixedly connected with an auxiliary positioning rod 121, the auxiliary positioning rod 121 slides to penetrate through the auxiliary cavity 119, an auxiliary positioning groove 1102 is formed in the piston body 1101, and the auxiliary positioning rod 121 and the auxiliary positioning groove 1102 are matched components. Set up supplementary chamber 119 to set up expanding spring 120 and supplementary locating lever 121 in supplementary chamber 119, in supplementary chamber 119 is extruded to the medium of cylinder 100 bottom to the decline in-process of piston body 1101, supplementary locating lever 121 also inserts supplementary constant head tank 1102 in the time of wedge guide block 114 inserts wedge draw-in groove 115, supplementary fixed is carried out to piston body 1101 to the cooperation of supplementary locating lever 121 and supplementary constant head tank 1102, guarantees the stability of piston body 1101 auto-lock.

Example 2

Referring to fig. 5, on the basis of embodiment 1, a plurality of elastic telescopic rods 204 are fixedly mounted on the fixed shell 203, one end of each elastic telescopic rod 204 is fixedly connected with a locking rod 205, a plurality of locking holes 104 are formed in the outer peripheral surface of the piston rod 103, the plurality of locking holes 104 correspond to the plurality of locking rods 205 one by one, and the locking holes 104 and the locking rods 205 are matched members. The elastic telescopic rods 204 are fixedly installed on the fixed shell 203 at equal radians, the fixed shell 203 is provided with a plurality of through holes 206 at equal radians, the through holes 206 are in one-to-one correspondence with the elastic telescopic rods 204, and the locking holes 104 are arranged on the outer peripheral surface of the piston rod 103 at equal radians. After the piston body 1101 is self-locked, the locking holes 104 on the fixed shell 203 move to one side of the corresponding locking rods 205, the elastic telescopic rods 204 push the locking rods 205 to be inserted into the corresponding locking holes 104, the piston rod 103 is self-locked, and the whole oil cylinder structure is self-locked from top to bottom.

The working principle is as follows:

the method comprises the following steps: when the piston rod 103 needs to ascend, a medium in the cylinder 100 is discharged through the first medium port 107 and the first medium through pipe 105 in sequence, an external medium enters the cylinder 100 through the second medium through pipe 106 and the second medium port 108 in sequence, the piston body 1101 ascends under the action of the medium, and then the piston rod 103 ascends, and when the piston rod 103 needs to descend, on the contrary, the piston plate 109 descends under the action of the external medium, and then the piston rod 103 descends;

step two: when the piston rod 103 needs to be fixed, the pressure retaining valves on the first medium through pipe 105 and the second medium through pipe 106 are closed, the piston rod 103 is fixed, when the pressure retaining valves leak, the piston rod 103 descends under the action of gravity, when the wedge-shaped guide blocks 114 on the piston body 1101 move to the positions of the wedge-shaped clamping grooves 115, the piston rod 103 extrudes the piston plate 109 under the action of gravity, the piston plate 109 extrudes the movable rod 110, the movable rod 110 extrudes the extrusion blocks 111, the extrusion blocks 111 slide downwards in the extrusion grooves 112, the extrusion blocks 111 then enter the guide grooves 113 to extrude the two wedge-shaped guide blocks 114, the two wedge-shaped guide blocks 114 move towards two sides along the guide grooves 113 under the action of the extrusion blocks 111, so that the wedge-shaped guide blocks 114 are inserted into the corresponding wedge-shaped clamping grooves 115, meanwhile, the piston body 1101 extrudes the medium at the bottom of the cylinder body 100 into the first oil cavity 116, the medium enters the second oil cavity 1101 through the first oil cavity 116, the medium then enters the third oil cavity 118 through the second oil cavity 117, the positioning rod 119 then pulls the auxiliary oil cavity 121, and stops the expansion spring 121;

step three: at this time, the locking holes 104 move to the corresponding locking rods 205, and the elastic expansion rods 204 push the locking rods 205 to be inserted into the corresponding locking holes 104, so that locking is completed.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the present template may be made by those skilled in the art without departing from the principles of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. A high-stability self-locking oil cylinder comprises a cylinder body (100), an upper end cover (101), a lower end cover (102) and a piston rod (103), and is characterized in that a fixed top plate (202) is fixedly installed on the upper end cover (101), a fixed bottom plate (200) is fixedly installed on the lower end cover (102), a fixed shell (203) is fixedly installed on the fixed top plate (202), a plurality of elastic telescopic rods (204) are fixedly installed on the fixed shell (203), one end of each elastic telescopic rod (204) is fixedly connected with a locking rod (205), a plurality of locking holes (104) are formed in the outer peripheral surface of the piston rod (103), the locking holes (104) correspond to the locking rods (205) one by one, and the locking holes (104) and the locking rods (205) are matched components;

a first medium port (107) and a second medium port (108) are formed in the cylinder body (100), a first medium through pipe (105) is fixedly mounted on one side of the first medium port (107), and a second medium through pipe (106) is fixedly mounted on one side of the second medium port (108);

the bottom of the piston rod (103) is fixedly provided with a piston plate (109), the piston plate (109) is arranged in the cylinder body (100), the bottom of the piston plate (109) is fixedly provided with a moving rod (110), a piston body (1101) is arranged below the piston plate (109), the moving rod (110) penetrates through the top of the piston body (1101) in a sliding manner, an extrusion groove (112) is formed in the piston body (1101), the bottom of the moving rod (110) is fixedly provided with an extrusion block (111), the extrusion block (111) is arranged in the extrusion groove (112) in a sliding manner, a guide groove (113) is formed in the piston body (1101), two wedge-shaped guide blocks (114) are arranged in the guide groove (113) in a sliding manner, the extrusion groove (112) is communicated with the guide groove (113), the inner wall of the cylinder body (100) is provided with two wedge-shaped clamping grooves (115), the two wedge-shaped guide blocks (114) correspond to the two wedge-shaped clamping grooves (115) one by one, and the wedge-shaped guide blocks (114) and the wedge-shaped clamping grooves (115) are matched components;

the oil cylinder is characterized in that a first oil cavity (116) and a third oil cavity (118) are formed in the bottom of the cylinder body (100), a second oil cavity (117) is formed in the lower end cover (102), one end of the first oil cavity (116) is fixedly connected with the second oil cavity (117), one end of the second oil cavity (117) is far away from the first oil cavity (116) and is fixedly connected with the third oil cavity (118), an auxiliary cavity (119) is formed in the inner wall of the cylinder body (100), one end of the third oil cavity (118) is far away from the second oil cavity (117) and is fixedly connected with the auxiliary cavity (119), an expansion spring (120) is fixedly installed in the auxiliary cavity (119), one end of the expansion spring (120) is fixedly connected with the inner wall of the auxiliary cavity (119), the other end of the expansion spring (120) is fixedly connected with an auxiliary positioning rod (121), the auxiliary positioning rod (121) slidably penetrates through the auxiliary cavity (119), an auxiliary positioning groove (1102) is formed in the piston body (1101), and the auxiliary positioning rod (121) and the auxiliary positioning groove (1102) is a matched component.

2. The high-stability self-locking oil cylinder according to claim 1, wherein the upper end cover (101) is fixedly mounted on the top of the cylinder body (100), and the lower end cover (102) is fixedly mounted on the bottom of the cylinder body (100).

3. The high-stability self-locking oil cylinder as claimed in claim 1, wherein a plurality of fixing rods (201) are fixedly arranged between the fixing top plate (202) and the fixing bottom plate (200).

4. The high-stability self-locking oil cylinder according to claim 3, wherein the fixed shell (203) is fixedly arranged on the upper surface of the fixed top plate (202).

5. The high-stability self-locking oil cylinder is characterized in that a plurality of elastic telescopic rods (204) are fixedly mounted on a fixed shell (203) in an equal radian mode, a plurality of through holes (206) are formed in the fixed shell (203) in an equal radian mode, the through holes (206) correspond to the elastic telescopic rods (204) one by one, and a plurality of locking holes (104) are formed in the outer peripheral surface of a piston rod (103) in an equal radian mode.

6. The high-stability self-locking oil cylinder according to claim 1, wherein the first medium port (107) and the second medium port (108) are arranged on the same side of the cylinder body (100), the first medium port (107) is arranged above the second medium port (108), the second medium port (108) is arranged below the wedge-shaped clamping groove (115), and the first medium through pipe (105) and the second medium through pipe (106) are both provided with pressure retaining valves.

7. The high-stability self-locking oil cylinder according to claim 1, wherein the two wedge-shaped guide blocks (114) are respectively arranged on two sides of the extrusion block (111), and the two wedge-shaped clamping grooves (115) are respectively arranged on inner walls of two sides of the cylinder body (100).

8. The high-stability self-locking oil cylinder according to any one of claims 1 to 7, characterized in that the working process of the self-locking oil cylinder is as follows:

the method comprises the following steps: when the piston rod (103) needs to ascend, media in the cylinder body (100) are discharged through the first media opening (107) and the first media through pipe (105) in sequence, external media enter the cylinder body (100) through the second media through pipe (106) and the second media opening (108) in sequence, the piston body (1101) ascends under the action of the media, the piston rod (103) ascends, and when the piston rod (103) needs to descend, on the contrary, the piston plate (109) descends under the action of the external media, and the piston rod (103) descends;

step two: when the piston rod (103) needs to be fixed, the pressure retaining valves on the first medium through pipe (105) and the second medium through pipe (106) are closed, the piston rod (103) is fixed, when the pressure retaining valves leak, the piston rod (103) descends under the action of gravity, when the wedge-shaped guide block (114) on the piston body (1101) moves to the position of the wedge-shaped clamping groove (115), the piston rod (103) extrudes the piston plate (109) under the action of gravity, the piston plate (109) extrudes the movable rod (110), the movable rod (110) extrudes the extrusion block (111), the extrusion block (111) slides downwards in the extrusion groove (112), the extrusion block (111) then enters the guide groove (113) to extrude the two wedge-shaped guide blocks (114), the two wedge-shaped guide blocks (114) move towards two sides along the guide groove (113) under the action of the extrusion block (111), so that the wedge-shaped guide blocks (114) are inserted into the corresponding wedge-shaped clamping grooves (115), and meanwhile, the piston body (100) extrudes the medium at the bottom of the cylinder body into the first medium oil chamber (116), then enters the second medium chamber (118) through the second medium chamber (118), the auxiliary positioning rod (121) pulls the expansion spring (120), so that the auxiliary positioning rod (121) is inserted into the auxiliary positioning groove (1102), and the piston body (1101) stops moving;

step three: at the moment, the locking holes (104) move to one side of the corresponding locking rods (205), and the elastic telescopic rods (204) push the locking rods (205) to be inserted into the corresponding locking holes (104), so that locking is completed.