A high stability self-locking cylinder

Abstract

The invention discloses a high-stability self-locking oil cylinder, which relates to the technical field of oil cylinders. The invention discloses a cylinder body, an upper end cover, a lower end cover, and a piston rod. 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 the elastic telescopic rod is fixedly connected to a locking rod, a plurality of locking holes are opened on the outer circumference of the piston rod, and the plurality of locking holes correspond to the plurality of locking rods one-to-one. The locking holes and the locking rods are matching components. An extrusion groove, a guide groove and a corresponding transmission structure are arranged on the piston body. When the pressure-maintaining valves on the first medium through pipe and the second medium through pipe leak, the wedge-shaped guide block can be inserted into the wedge-shaped slot through the cooperation of the extrusion block and the wedge-shaped guide block to self-lock the piston body dropped due to gravity, so as to avoid a dangerous situation caused by the continuous drop of the piston body.

Description

Technical Field

[0001] The present invention relates to the technical field of oil cylinders, and more specifically, to a high-stability self-locking oil cylinder. Background Art

[0002] The oil cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). When using the oil cylinder to achieve reciprocating motion, not only can the reduction device be eliminated, but there is also no transmission gap, and the movement is smooth. It is widely used in various hydraulic systems.

[0003] When the piston rod on the oil cylinder needs to be fixed, the pressure-maintaining valve on the medium channel needs to be closed to ensure the stability of the medium pressure inside the oil cylinder. However, this method is not very reliable. If there is a medium leak, the piston rod will drop due to gravity, which is very dangerous. Therefore, a self-locking structure needs to be installed on the oil cylinder to prevent the piston rod from continuing to drop to the bottom. The existing self-locking oil cylinder has low stability and only considers the single locking of the piston body. When there is a problem with the locking structure, the piston rod will continue to drop, causing a dangerous situation. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a high-stability self-locking cylinder.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] 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 mounted on the upper end cover, a fixed bottom plate is fixedly mounted on the lower end cover, a fixed shell is fixedly mounted on the fixed top plate, a plurality of elastic telescopic rods are fixedly mounted on the fixed shell, one end of the elastic telescopic rod is fixedly connected to a locking rod, a plurality of locking holes are opened on the outer circumference of the piston rod, the plurality of locking holes correspond to the plurality of locking rods one by one, and the locking holes and the locking rods are matching components;

[0007] The cylinder body is provided with a first medium port and a second medium port, a first medium pipe is fixedly installed on one side of the first medium port, and a second medium pipe is fixedly installed on one side of the second medium port;

[0008] A piston plate is fixedly installed at the bottom of the piston rod, and the piston plate is arranged in the cylinder body. A moving rod is fixedly installed at the bottom of the piston plate. A piston body is arranged below the piston plate. The moving rod slides through the top of the piston body. An extrusion groove is provided in the piston body. An extrusion block is fixedly installed at the bottom of the moving rod. The extrusion block is slidably installed in the extrusion groove. A guide groove is provided in the piston body. Two wedge-shaped guide blocks are slidably installed in the guide groove. The extrusion groove is connected with the guide groove. Two wedge-shaped grooves are provided on the inner wall of the cylinder body. The two wedge guide blocks correspond to the two wedge grooves one by one, and the wedge guide blocks and the wedge grooves are matching components.

[0009] The bottom of the cylinder body is provided with a first oil chamber and a third oil chamber, the lower end cover is provided with a second oil chamber, one end of the first oil chamber is fixedly connected to the second oil chamber, and the end of the second oil chamber away from the first oil chamber is fixedly connected to the third oil chamber, an auxiliary chamber is provided on the inner wall of the cylinder body, and one end of the third oil chamber away from the second oil chamber is fixedly connected to the auxiliary chamber, a telescopic spring is fixedly installed in the auxiliary chamber, one end of the telescopic spring is fixedly connected to the inner wall of the auxiliary chamber, and the other end of the telescopic spring is fixedly connected to an auxiliary positioning rod, the auxiliary positioning rod slides through the auxiliary chamber, an auxiliary positioning groove is provided on the piston body, and the auxiliary positioning rod and the auxiliary positioning groove are matching components.

[0010] Furthermore, the upper end cover is fixedly installed on the top of the cylinder body, and the lower end cover is fixedly installed on the bottom of the cylinder body.

[0011] Furthermore, a plurality of fixing rods are fixedly installed between the fixed top plate and the fixed bottom plate.

[0012] Furthermore, the fixed shell is fixedly installed on the upper surface of the fixed top plate.

[0013] Furthermore, a plurality of elastic telescopic rods are fixedly mounted on a fixed shell with equal curvature, a plurality of through holes are opened on the fixed shell with equal curvature, the plurality of through holes correspond to the plurality of elastic telescopic rods one by one, and a plurality of locking holes are opened on the outer peripheral surface of the piston rod with equal curvature.

[0014] Furthermore, the first medium port and the second medium port are opened on the same side of the cylinder body, the first medium port is arranged above the second medium port, and the second medium port is arranged below the wedge-shaped slot, and pressure-maintaining valves are installed on the first medium through pipe and the second medium through pipe.

[0015] Furthermore, two wedge-shaped guide blocks are respectively arranged on both sides of the extrusion block, and two wedge-shaped grooves are respectively opened on the inner walls on both sides of the cylinder body.

[0016] Furthermore, the working process of the self-locking cylinder is as follows:

[0017] Step 1: When the piston rod needs to rise, the medium in the cylinder body is discharged through the first medium port and the first medium through-tube in sequence, and the external medium enters the cylinder body through the second medium through-tube and the second medium port in sequence. Under the action of the medium, the piston body rises, and then the piston rod rises. When the piston rod needs to fall, on the contrary, under the action of the external medium, the piston plate falls, and then the piston rod falls;

[0018] Step 2: When the piston rod needs to be fixed, the pressure-maintaining valves on the first medium pipe and the second medium pipe are closed, and the piston rod is fixed. When the pressure-maintaining valve leaks, the piston rod drops under the action of gravity. When the wedge-shaped guide block on the piston body moves to the wedge-shaped slot position, the piston rod squeezes the piston plate under the action of gravity, and the piston plate squeezes the moving rod, and the moving rod squeezes the squeezing block, and then the squeezing block slides downward in the squeezing slot, and the squeezing block then enters the guide slot to squeeze the two wedge-shaped guide blocks. Under the action of the squeezing block, the two wedge-shaped guide blocks move to both sides along the guide slot, so that the wedge-shaped guide blocks are inserted into the corresponding wedge-shaped slots. At the same time, the piston body squeezes the medium at the bottom of the cylinder body into the first oil chamber, and then the medium enters the second oil chamber through the first oil chamber, and then the medium enters the third oil chamber through the second oil chamber, and the medium in the third oil chamber enters the auxiliary chamber for squeezing An auxiliary positioning rod, the auxiliary positioning rod pulls the telescopic spring, and then the auxiliary positioning rod is inserted into the auxiliary positioning groove, and the piston body stops moving. An extrusion groove, a guide groove and a corresponding transmission structure are arranged on the piston body. When the pressure-maintaining valve on the first medium through pipe and the second medium through pipe leaks, the wedge-shaped guide block can be inserted into the wedge-shaped groove through the cooperation of the extrusion block and the wedge-shaped guide block to self-lock the piston body due to gravity drop, so as to avoid the dangerous situation caused by the continuous drop of the piston body. An auxiliary cavity is arranged, and a telescopic spring and an auxiliary positioning rod are arranged in the auxiliary cavity. During the descending process of the piston body, the medium at the bottom of the cylinder body is squeezed into the auxiliary cavity until the wedge-shaped guide block is inserted into the wedge-shaped groove and the auxiliary positioning rod is also inserted into the auxiliary positioning groove. The cooperation of the auxiliary positioning rod and the auxiliary positioning groove can assist in fixing the piston body, so as to ensure the stability of the self-locking of the piston body.

[0019] Step three: At this time, the locking hole moves to the corresponding side of the locking rod, and the elastic telescopic rod pushes the locking rod to be inserted into the corresponding locking hole to complete the locking. After the piston body completes self-locking, the locking hole on the fixed shell moves to the corresponding side of the locking rod, and the elastic telescopic rod pushes the locking rod to be inserted into the corresponding locking hole to complete the self-locking of the piston rod, thereby completing the self-locking of the entire cylinder structure from top to bottom.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. An extrusion groove, a guide groove and a corresponding transmission structure are arranged on the piston body. When the pressure-maintaining valves on the first medium pipe and the second medium pipe leak, the extrusion block and the wedge-shaped guide block are matched to insert the wedge-shaped guide block into the wedge-shaped slot to self-lock the piston body that drops due to gravity, thereby avoiding a dangerous situation caused by the continuous drop of the piston body;

[0022] 2. An auxiliary cavity is set, and a telescopic spring and an auxiliary positioning rod are set in the auxiliary cavity. During the descending process of the piston body, the medium at the bottom of the cylinder body is squeezed into the auxiliary cavity until the wedge-shaped guide block is inserted into the wedge-shaped slot and the auxiliary positioning rod is also inserted into the auxiliary positioning slot. The cooperation of the auxiliary positioning rod and the auxiliary positioning slot is used to auxiliary fix the piston body to ensure the self-locking stability of the piston body. After the piston body completes self-locking, the locking hole on the fixed shell moves to the corresponding side of the locking rod, and the elastic telescopic rod pushes the locking rod to be inserted into the corresponding locking hole to complete the self-locking of the piston rod, thereby completing the self-locking of the entire oil cylinder structure from top to bottom, and the combination of multiple self-locking methods greatly improves the stability of the oil cylinder self-locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a high-stability self-locking cylinder;

[0024] Figure 2 is a cross-sectional view of a cylinder body of the present invention;

[0025] Figure 3 For the present invention Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 For the present invention Figure 2 The enlarged view of point B in the middle;

[0027] Figure 5 This is a diagram of the internal structure of the fixed shell of the present invention.

[0028] 100, cylinder body; 101, upper end cover; 102, lower end cover; 103, piston rod; 104, locking hole; 105, first medium through pipe; 106, second medium through pipe; 107, first medium port; 108, second medium port; 109, piston plate; 110, moving rod; 1101, piston body; 1102, auxiliary positioning groove; 111, extrusion block; 112, extrusion groove; 113, guide groove; 114, wedge-shaped guide block; 115, wedge-shaped slot; 116, first oil chamber; 117, second oil chamber; 118, third oil chamber; 119, auxiliary chamber; 120, telescopic spring; 121, auxiliary positioning rod; 200, fixed bottom plate; 201, fixed rod; 202, fixed top plate; 203, fixed shell; 204, elastic telescopic rod; 205, locking rod; 206, through hole. DETAILED DESCRIPTION

[0029] Example 1

[0030] Reference Figures 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. 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 fixed rods 201 are fixedly installed between the fixed top plate 202 and the fixed bottom plate 200. The fixed shell 203 is fixedly installed 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. A first medium port 107 and a second medium port 108 are opened on the cylinder body 100. 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 opened on the same side of the cylinder body 100 . The first medium port 107 is arranged above the second medium port 108 , and the second medium port 108 is arranged below the wedge-shaped slot 115 . Pressure-maintaining valves are installed on both the first medium pipe 105 and the second medium pipe 106 . A piston plate 109 is fixedly installed at the bottom of the piston rod 103, and the piston plate 109 is arranged in the cylinder body 100. A moving rod 110 is fixedly installed at the bottom of the piston plate 109, and a piston body 1101 is arranged below the piston plate 109. The moving rod 110 slides through the top of the piston body 1101, and an extrusion groove 112 is provided in the piston body 1101. An extrusion block 111 is fixedly installed at the bottom of the moving rod 110, and the extrusion block 111 is slidably installed in the extrusion groove 112. A guide groove 113 is provided in the piston body 1101, and two wedge-shaped guide blocks 114 are slidably installed in the guide groove 113, and the extrusion groove 112 is connected to the guide groove 113. Two wedge-shaped grooves 115 are provided on the inner wall of the cylinder body 100, and the two wedge-shaped guide blocks 114 correspond to the two wedge-shaped grooves 115 one by one, and the wedge-shaped guide blocks 114 and the wedge-shaped grooves 115 are matching components. Two wedge-shaped guide blocks 114 are respectively arranged on both sides of the extrusion block 111, and two wedge-shaped slots 115 are respectively opened on the inner walls of both sides of the cylinder body 100. The extrusion slot 112, the guide slot 113 and the corresponding transmission structure are arranged on the piston body 1101, so that when the pressure-maintaining valves on the first medium through pipe 105 and the second medium through pipe 106 leak, the wedge-shaped guide block 114 can be inserted into the wedge-shaped slot 115 through the cooperation between the extrusion block 111 and the wedge-shaped guide block 114 to self-lock the piston body 1101 that drops due to gravity, thereby avoiding the dangerous situation caused by the continuous drop of the piston body 1101.

[0031] A first oil chamber 116 and a third oil chamber 118 are provided at the bottom of the cylinder body 100, and a second oil chamber 117 is provided on the lower end cover 102. One end of the first oil chamber 116 is fixedly connected to the second oil chamber 117, and one end of the second oil chamber 117 away from the first oil chamber 116 is fixedly connected to the third oil chamber 118. An auxiliary chamber 119 is provided on the inner wall of the cylinder body 100, and one end of the third oil chamber 118 away from the second oil chamber 117 is fixedly connected to the auxiliary chamber 119. A telescopic spring 120 is fixedly installed in the auxiliary chamber 119, one end of the telescopic spring 120 is fixedly connected to the inner wall of the auxiliary chamber 119, and the other end of the telescopic spring 120 is fixedly connected to an auxiliary positioning rod 121, which slides through the auxiliary chamber 119, and an auxiliary positioning groove 1102 is provided on the piston body 1101, and the auxiliary positioning rod 121 and the auxiliary positioning groove 1102 are matching components. An auxiliary chamber 119 is provided, and a telescopic spring 120 and an auxiliary positioning rod 121 are provided in the auxiliary chamber 119. During the descending process of the piston body 1101, the medium at the bottom of the cylinder body 100 is squeezed into the auxiliary chamber 119 until the wedge-shaped guide block 114 is inserted into the wedge-shaped slot 115 and the auxiliary positioning rod 121 is also inserted into the auxiliary positioning slot 1102. The cooperation between the auxiliary positioning rod 121 and the auxiliary positioning slot 1102 assists in fixing the piston body 1101, thereby ensuring the self-locking stability of the piston body 1101.

[0032] Example 2

[0033] Reference Figure 5 On the basis of Example 1, a plurality of elastic telescopic rods 204 are fixedly installed on the fixed shell 203, one end of the elastic telescopic rod 204 is fixedly connected to the locking rod 205, and a plurality of locking holes 104 are opened on the outer circumference of the piston rod 103, and 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 matching components. The plurality of elastic telescopic rods 204 are fixedly installed on the fixed shell 203 with equal arcs, and the fixed shell 203 has a plurality of through holes 206 with equal arcs, and the plurality of through holes 206 correspond to the plurality of elastic telescopic rods 204 one by one, and the plurality of locking holes 104 are opened on the outer circumference of the piston rod 103 with equal arcs. After the piston body 1101 completes self-locking, the locking hole 104 on the fixed shell 203 moves to the side of the corresponding locking rod 205, and the elastic telescopic rod 204 pushes the locking rod 205 to insert into the corresponding locking hole 104, so as to complete the self-locking of the piston rod 103, and then complete the self-locking of the entire oil cylinder structure from top to bottom.

[0034] Working principle:

[0035] Step 1: When the piston rod 103 needs to rise, the medium in the cylinder body 100 is discharged through the first medium port 107 and the first medium passage 105 in sequence, and the external medium enters the cylinder body 100 through the second medium passage 106 and the second medium port 108 in sequence. Under the action of the medium, the piston body 1101 rises, and then the piston rod 103 rises. When the piston rod 103 needs to descend, on the contrary, under the action of the external medium, the piston plate 109 descends, and then the piston rod 103 descends;

[0036] Step 2: When the piston rod 103 needs to be fixed, the pressure-retaining valves on the first medium passage 105 and the second medium passage 106 are closed, and the piston rod 103 is fixed. When the pressure-retaining valve leaks, the piston rod 103 drops 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 slot 115, the piston rod 103 squeezes the piston plate 109 under the action of gravity, and the piston plate 109 squeezes the moving rod 110, and the moving rod 110 squeezes the squeezing block 111, and then the squeezing block 111 slides downward in the squeezing groove 112, and the squeezing block 111 then enters the guide groove 113 and squeezes the two wedge-shaped guide blocks 114, and the squeezing block 111 Under the action of 11, the two wedge-shaped guide blocks 114 move to both sides along the guide groove 113, so that the wedge-shaped guide blocks 114 are inserted into the corresponding wedge-shaped slots 115. At the same time, the piston body 1101 squeezes the medium at the bottom of the cylinder body 100 into the first oil chamber 116, and then the medium enters the second oil chamber 117 through the first oil chamber 116, and then the medium enters the third oil chamber 118 through the second oil chamber 117. The medium in the third oil chamber 118 enters the auxiliary chamber 119 and squeezes the auxiliary positioning rod 121. The auxiliary positioning rod 121 pulls the telescopic spring 120, and then the auxiliary positioning rod 121 is inserted into the auxiliary positioning groove 1102, and the piston body 1101 stops moving;

[0037] Step 3: At this time, the locking hole 104 moves to the side of the corresponding locking rod 205, and the elastic telescopic rod 204 pushes the locking rod 205 to insert into the corresponding locking hole 104 to complete the locking.

[0038] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of this template.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high-stability self-locking oil cylinder, comprising a cylinder body (100), an upper end cover (101), a lower end cover (102), and a piston rod (103). It is characterized in that A fixed top plate (202) is fixedly mounted on the upper end cover (101), a fixed bottom plate (200) is fixedly mounted on the lower end cover (102), a fixed shell (203) is fixedly mounted on the fixed top plate (202), a plurality of elastic telescopic rods (204) are fixedly mounted on the fixed shell (203), one end of the elastic telescopic rod (204) is fixedly connected to a locking rod (205), a plurality of locking holes (104) are formed on the outer circumference 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 matching components; The cylinder body (100) is provided with a first medium port (107) and a second medium port (108); a first medium passage pipe (105) is fixedly installed on one side of the first medium port (107); and a second medium passage pipe (106) is fixedly installed on one side of the second medium port (108); A piston plate (109) is fixedly mounted on the bottom of the piston rod (103), and the piston plate (109) is arranged in the cylinder body (100). A moving rod (110) is fixedly mounted on the bottom of the piston plate (109), and a piston body (1101) is arranged below the piston plate (109). The moving rod (110) slides through the top of the piston body (1101), and an extrusion groove (112) is provided in the piston body (1101). An extrusion block (111) is fixedly mounted on the bottom of the moving rod (110). The block (111) is slidably installed in the extrusion groove (112), a guide groove (113) is provided in the piston body (1101), two wedge-shaped guide blocks (114) are slidably installed in the guide groove (113), the extrusion groove (112) is connected to the guide groove (113), the inner wall of the cylinder body (100) is provided with two wedge-shaped grooves (115), the two wedge-shaped guide blocks (114) correspond to the two wedge-shaped grooves (115) one by one, and the wedge-shaped guide blocks (114) and the wedge-shaped grooves (115) are matching components; A first oil chamber (116) and a third oil chamber (118) are provided at the bottom of the cylinder body (100); a second oil chamber (117) is provided on the lower end cover (102); one end of the first oil chamber (116) is fixedly connected to the second oil chamber (117); one end of the second oil chamber (117) away from the first oil chamber (116) is fixedly connected to the third oil chamber (118); an auxiliary chamber (119) is provided on the inner wall of the cylinder body (100); one end of the third oil chamber (118) away from the second oil chamber (117) is fixedly connected to the third oil chamber (118); An auxiliary cavity (119), wherein a telescopic spring (120) is fixedly installed in the auxiliary cavity (119), wherein one end of the telescopic spring (120) is fixedly connected to the inner wall of the auxiliary cavity (119), and the other end of the telescopic spring (120) is fixedly connected to an auxiliary positioning rod (121), wherein the auxiliary positioning rod (121) slides through the auxiliary cavity (119), and an auxiliary positioning groove (1102) is provided on the piston body (1101), and the auxiliary positioning rod (121) and the auxiliary positioning groove (1102) are matching components.

2. A high stability self-locking cylinder according to claim 1, It is characterized in that 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. A high stability self-locking cylinder according to claim 1, It is characterized in that A plurality of fixing rods (201) are fixedly installed between the fixing top plate (202) and the fixing bottom plate (200).

4. A high stability self-locking cylinder according to claim 3, It is characterized in that The fixed shell (203) is fixedly mounted on the upper surface of the fixed top plate (202).

5. A high stability self-locking cylinder according to claim 4, It is characterized in that A plurality of elastic telescopic rods (204) are fixedly mounted on a fixed shell (203) with equal arcs, a plurality of through holes (206) are opened on the fixed shell (203) with equal arcs, the plurality of through holes (206) correspond to the plurality of elastic telescopic rods (204) one by one, and a plurality of locking holes (104) are opened on the outer peripheral surface of the piston rod (103) with equal arcs.

6. A high stability self-locking cylinder according to claim 1, It is characterized in that The first medium port (107) and the second medium port (108) are opened on the same side of the cylinder body (100); the first medium port (107) is arranged above the second medium port (108), and the second medium port (108) is arranged below the wedge-shaped slot (115); and pressure-maintaining valves are installed on both the first medium passage pipe (105) and the second medium passage pipe (106).

7. A high stability self-locking cylinder according to claim 1, It is characterized in that Two wedge-shaped guide blocks (114) are respectively arranged on both sides of the extrusion block (111), and two wedge-shaped clamping grooves (115) are respectively opened on the inner walls on both sides of the cylinder body (100).

8. A high-stability self-locking cylinder according to any one of claims 1 to 7, It is characterized in that The working process of the self-locking cylinder is as follows: Step 1: When the piston rod (103) needs to rise, the medium in the cylinder body (100) is discharged through the first medium port (107) and the first medium passage (105) in sequence, and the external medium enters the cylinder body (100) through the second medium passage (106) and the second medium port (108) in sequence. Under the action of the medium, the piston body (1101) rises, and then the piston rod (103) rises. When the piston rod (103) needs to descend, conversely, under the action of the external medium, the piston plate (109) descends, and then the piston rod (103) descends; Step 2: When the piston rod (103) needs to be fixed, the pressure-retaining valves on the first medium passage (105) and the second medium passage (106) are closed, and the piston rod (103) is fixed. When the pressure-retaining valve leaks, 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 slot (115), the piston rod (103) squeezes the piston plate (109) under the action of gravity, and the piston plate (109) squeezes the moving rod (110), and the moving rod (110) squeezes the squeezing block (111), and then the squeezing block (111) slides downward in the squeezing groove (112), and the squeezing block (111) then enters the guide groove (113) and squeezes the two wedge-shaped guide blocks (114). Under the action of the two wedge-shaped guide blocks (114) along the guide groove (113) to move to both sides, so that the wedge-shaped guide blocks (114) are inserted into the corresponding wedge-shaped slots (115). At the same time, the piston body (1101) squeezes the medium at the bottom of the cylinder body (100) into the first oil chamber (116), and then the medium enters the second oil chamber (117) through the first oil chamber (116), and then the medium enters the third oil chamber (118) through the second oil chamber (117). The medium in the third oil chamber (118) enters the auxiliary chamber (119) to squeeze the auxiliary positioning rod (121), and the auxiliary positioning rod (121) pulls the telescopic spring (120), and then the auxiliary positioning rod (121) is inserted into the auxiliary positioning groove (1102), and the piston body (1101) stops moving; Step 3: At this time, the locking hole (104) moves to the side of the corresponding locking rod (205), and the elastic telescopic rod (204) pushes the locking rod (205) to insert into the corresponding locking hole (104), thereby completing the locking.

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