Leakage-proof hydraulic cylinder

Abstract

The invention relates to the technical field of hydraulic cylinders, and discloses an anti-leakage hydraulic cylinder which comprises a cylinder body, an end cover and a tail cover arranged at the two ends of the cylinder body, oil holes formed in the outer sides of the end cover and the tail cover, a piston rod arranged in the end cover, a piston head arranged at the end, located in the cylinder body, of the piston rod, and a standing sealing ring arranged on the outer side of the piston head. The piston further comprises an auxiliary sealing assembly, and the auxiliary sealing assembly comprises a containing ring groove and a mounting ring groove which are formed in the outer side of the piston head. The invention discloses a leakproof hydraulic cylinder. By arranging the auxiliary sealing assembly, when the standing sealing ring leaks, oil pressure in the cylinder body acts on the hollow rubber ring, the supporting piece is inflated and swelled to open the preparation sealing ring, the preparation sealing ring is attached to the interior of the cylinder body, the standing sealing ring is replaced to achieve the sealing effect, and therefore a layer of guarantee effect is achieved, leakage is avoided when the piston head works, and the service life of the piston head is prolonged. Therefore, the performance of the device is partially or completely lost, and the use stability and the working safety of the device are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic cylinders, and in particular to an anti-leakage hydraulic cylinder. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has the characteristics of simple structure and reliable operation. It is widely used in the hydraulic systems of various machines, such as engineering vehicles, machine tools, and marine machinery. The working principle of a hydraulic cylinder is to push the piston or plunger in the cylinder through liquid pressure. Its components usually include a cylinder, a cylinder head, a piston, a piston rod, a sealing device, a buffer device, and an exhaust device.

[0003] A high-quality hydraulic cylinder needs to have good sealing properties to prevent hydraulic oil leakage; at the same time, it must have sufficient strength and wear resistance to ensure reliability and stability in long-term use.

[0004] A safety hydraulic cylinder with anti-leakage function is disclosed in the patent with patent publication number CN116950953A. It includes a cylinder barrel, the cylinder barrel is fixedly connected to a cylinder head, the cylinder head is slidably connected to a piston rod, the piston rod is fixedly connected to a main piston slidably connected to the cylinder barrel, the piston rod is fixedly connected to a nut, the main piston is provided with a sealing gasket, the main piston annular array has a piston plate, the piston plates of the annular array are all provided with a first return spring between the main piston, the main piston is provided with an airbag, and the airbag is located on the inner side of the sealing gasket. The present invention increases the sealing strength of the sealing gasket to the gap between the cylinder barrel and the main piston by detecting the hydraulic oil pressure in the cylinder barrel, so as to avoid excessive hydraulic oil pressure in the cylinder barrel, resulting in separation of the sealing gasket from the cylinder barrel, and causing oil leakage in the cylinder barrel.

[0005] The prior art has the following defects:

[0006] Sealing rings are required for both the end cover and the piston of the hydraulic cylinder to avoid leakage. During use, the sealing ring at the end cover is only resistant to pressure on one side and is less affected by the internal pressure of the hydraulic cylinder, while the sealing ring of the piston is resistant to pressure on both sides and is greatly affected by the internal pressure of the hydraulic cylinder. Therefore, it is easy to deform and break, which will cause internal leakage in the hydraulic cylinder, weaken the output energy and stability of the hydraulic cylinder, and affect the performance of the hydraulic cylinder. At the same time, since the piston part is completely located inside the hydraulic cylinder, it is difficult to detect internal leakage without instrument detection. If the hydraulic cylinder works in this condition for a long time, the probability of accidents will greatly increase, which is not in line with the modern concept of safe production. Summary of the invention

[0007] In view of the problem that leakage may occur in the prior art, an anti-leakage hydraulic cylinder is proposed.

[0008] The present application provides a leakage-proof hydraulic cylinder, the purpose of which is to prevent leakage of equipment.

[0009] The technical solution of the present invention is: a leakage-proof hydraulic cylinder, comprising a cylinder body, end covers and tail covers arranged at both ends of the cylinder body, oil holes arranged on the outside of the end covers and the tail covers, a piston rod arranged inside the end covers, a piston head arranged at one end of the piston rod located in the cylinder body, a standing seal ring arranged on the outside of the piston head, and an auxiliary seal assembly, the auxiliary seal assembly comprising a receiving ring groove and a mounting ring groove arranged on the outside of the piston head, a preliminary seal ring and a support member arranged inside the receiving ring groove, a hollow rubber ring arranged inside the mounting ring groove, a mounting slot arranged at the center of the piston head, an outflow hole arranged between the mounting slot and the receiving ring groove, an inlet hole arranged between the mounting slot and the mounting ring groove, a mounting block arranged inside the mounting slot, two plug holes arranged on the outside of the mounting block, and a reaction groove arranged inside the mounting block;

[0010] The preliminary sealing ring is wrapped around the outside of the support member, and the outer contour diameter of the preliminary sealing ring is smaller than the outer wheel diameter of the regular sealing ring. The support member is connected to the outflow hole, and the hollow rubber ring is connected to the inlet hole. The hollow rubber ring and the mounting block are respectively filled with liquid reactants and solid reactants that can produce chemical reactions and release gases. Both the two plug holes extend into the reaction tank, and the two plug holes are respectively connected to the outflow hole and the inlet hole.

[0011] Furthermore, two regular sealing rings are provided, which are respectively distributed at the two ends of the piston head, and the reserve sealing ring and the hollow rubber ring are located between the two regular sealing rings.

[0012] Furthermore, a trapezoidal notch is provided on the edge of the outer contour of the regular sealing ring.

[0013] Furthermore, a one-way valve is installed in the inner thread of the plug hole, and the one-way valve corresponding to the outflow hole is opened in one direction toward the support member, and the one-way valve corresponding to the inlet hole is opened in one direction toward the installation slot.

[0014] Furthermore, the support member includes an air cushion arranged in the receiving ring groove, a fixing sleeve arranged outside the air cushion, a hollow bolt arranged inside the fixing sleeve, and a communicating air hole arranged between the hollow bolt and the outside of the air cushion;

[0015] The cross section of the fixing sleeve is in an I-shape. The fixing sleeve passes through the air cushion. The hollow bolt passes through the fixing sleeve and extends into the outflow hole and is threadedly connected with the outflow hole.

[0016] Furthermore, the auxiliary sealing assembly also includes a reaction container arranged inside the reaction tank, a receiving port arranged outside the reaction container, a placement net cylinder arranged inside the reaction container, a sealing cover arranged at the opening of the placement net cylinder, and a laying net plate arranged inside the placement net cylinder;

[0017] The receiving port is located directly below the plug hole, and the solid reactant is evenly laid in the gap between the laying mesh plates, and a gap is maintained between the outer wall of the placement mesh tube and the inner wall of the reaction container.

[0018] Furthermore, the laying mesh plates and the placement mesh cylinder are distributed in a linear array, and one of the laying mesh plates extends to the opening of the placement mesh cylinder.

[0019] Furthermore, a prompt component is arranged inside the reaction container, and the prompt component includes an external box arranged inside the reaction container, a pendulum arranged inside the external box, a cover plate arranged at the opening of the external box, a sounding reed arranged on the inner wall of the external box and the surface of the cover plate, a ventilation hole arranged on the surface of the cover plate, a fixing plug arranged inside the ventilation hole, and a connecting rope arranged between the fixing plug and the pendulum;

[0020] The pendulum is located between two sounding reeds, and the two sounding reeds are located on the swinging path of the pendulum.

[0021] Beneficial effects of the present invention:

[0022] 1. By setting up an auxiliary sealing component, when the regular sealing ring leaks, the oil pressure in the cylinder body acts on the hollow rubber ring, and the liquid reactant in the hollow rubber ring enters the mounting block to react with the solid reactant, generating a large amount of gas and heat. The gas inside the mounting block increases, and further expands after being heated, and enters the support member. The support member is inflated to expand the reserve sealing ring, so that the reserve sealing ring fits the inside of the cylinder body and replaces the regular sealing ring to play a sealing role. This plays a protective role to avoid leakage when the piston head is working, resulting in partial or complete loss of its performance, thereby improving the stability of equipment use and work safety.

[0023] 2. A trapezoidal notch is set on the edge of the outer contour of the stock sealing ring. As shown in the figure, when the pressure on one side of the stock sealing ring increases, the trapezoidal notch is pressed outward and fits more closely with the inside of the cylinder body, which enhances the sealing performance and reduces the possibility of leakage inside the cylinder body.

[0024] 3. Fix the air cushion with hollow bolts so that the air cushion can be firmly confined in the storage ring groove without affecting the inflation of the air cushion. This can prevent the air cushion from being pushed out of position by air pressure when inflated, resulting in the air cushion being unable to continue to inflate and insufficient swelling, which would affect the sealing performance.

[0025] 4. By evenly laying the solid reactants in the gaps between the laying mesh plates, the surface area of ​​the solid reactants is increased. In this way, when the liquid reactants enter the reaction container, the solid reactants and liquid reactants can react quickly, releasing more gas and heat in a short time, which speeds up the startup reaction of the prepared sealing ring, reduces the possibility of leakage in the equipment, and increases safety.

[0026] 5. By setting up the prompt component, the initial connecting rope pulls the pendulum to contact with the sounding reed on one side. The movement of the piston head does not affect the pendulum. When a large amount of gas appears in the reaction tank, the fixed plug is pushed out of the ventilation hole, and the pendulum begins to shake and collide with the sounding reed. Such collision will make a sound, which serves as a prompt, and can be handled in time to reduce the possibility of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional diagram of the anti-leakage hydraulic cylinder of the present invention;

[0028] Figure 2 It is a schematic diagram of the interior of the hydraulic cylinder of the present invention;

[0029] Figure 3 It is a schematic diagram of the piston head of the present invention;

[0030] Figure 4 is a cross-sectional view of the piston head of the present invention;

[0031] Figure 5 For the present invention Figure 4 Amplified view of the auxiliary seal assembly;

[0032] Figure 6 This is a disassembled diagram of the piston head and the mounting block of the present invention;

[0033] Figure 7 This is a disassembled diagram of the support member of the present invention;

[0034] Figure 8 This is a schematic diagram of the interior of the mounting block of the present invention;

[0035] Fig. 9 This is a schematic diagram of the interior of the reaction container of the present invention;

[0036] Fig.10 This is a disassembly diagram of placing the net cylinder and the cover of the present invention;

[0037] Fig.11 is a cross-sectional view of a reaction vessel of the present invention;

[0038] Fig.12 It is a cross-sectional view of the conventional sealing ring of the present invention;

[0039] Fig.13 It is a schematic diagram of the components of the present invention;

[0040] Fig.14 This is a disassembly diagram of the external box and cover plate of the present invention.

[0041] In the figure:

[0042] 1. Cylinder body; 2. End cover; 3. Tail cover; 4. Oil hole; 5. Piston rod; 6. Piston head; 7. Regular seal ring; 8. Auxiliary seal assembly; 81. Storage ring groove; 82. Reserve seal ring; 83. Support; 831. Air cushion; 832. Fixing sleeve; 833. Hollow bolt; 834. Connecting air hole; 84. Mounting ring groove; 85. Hollow rubber ring; 86. Mounting slot; 87. Outflow Hole; 88, inlet hole; 89, mounting block; 810, plug hole; 811, one-way valve; 812, reaction tank; 813, reaction container; 814, receiving port; 815, placement of mesh cylinder; 816, sealing cover; 817, laying of mesh plate; 9, prompt component; 91, external box; 92, pendulum; 93, cover plate; 94, sounding reed; 95, ventilation hole; 96, fixing plug; 97, connecting rope. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0044] Example 1, reference Figure 1-12 , which is the first embodiment of the present invention, provides a leakage-proof hydraulic cylinder, including a cylinder body 1, end covers 2 and tail covers 3 arranged at both ends of the cylinder body 1, oil holes 4 arranged on the outside of the end covers 2 and the tail covers 3, a piston rod 5 arranged inside the end cover 2, a piston head 6 arranged at one end of the piston rod 5 located in the cylinder body 1, a regular sealing ring 7 arranged on the outside of the piston head 6, and also includes an auxiliary sealing component 8, the auxiliary sealing component 8 includes a receiving ring groove 81 and an installation ring groove 84 arranged on the outside of the piston head 6, and is arranged on the receiving ring groove 81. The preliminary sealing ring 82 and the supporting member 83 inside the receiving ring groove 81, the hollow rubber ring 85 arranged inside the mounting ring groove 84, the mounting slot 86 arranged at the center of the piston head 6, the outflow hole 87 arranged between the mounting slot 86 and the receiving ring groove 81, the inlet hole 88 arranged between the mounting slot 86 and the mounting ring groove 84, the mounting block 89 arranged inside the mounting slot 86, the two plug holes 810 arranged on the outside of the mounting block 89, and the reaction groove 812 arranged inside the mounting block 89.

[0045] Specifically, the end cover 2 and the tail cover 3 are fixed to the end cover 2 by bolts, the oil hole 4 is connected to the cylinder body 1, the piston rod 5 passes through the end cover 2, the piston head 6 is welded to the piston rod 5 and is slidably installed in the cylinder body 1, and two regular sealing rings 7 are provided, which are respectively distributed at both ends of the piston head 6, and the reserve sealing ring 82 and the hollow rubber ring 85 are located between the two regular sealing rings 7. The edge of the outer contour of the regular sealing ring 7 is provided with a trapezoidal notch. The edge of the outer contour is provided with a trapezoidal notch, such as Fig.12 As shown, when the pressure on one side of the regular sealing ring 7 increases, the trapezoidal notch is pressed and turned outward, and fits more closely with the inside of the cylinder body 1, so that the sealing is enhanced and the possibility of leakage inside the cylinder body 1 is reduced.

[0046] The preparation seal ring 82 is wrapped around the outside of the support member 83. The outer contour diameter of the preparation seal ring 82 is smaller than the outer wheel diameter of the regular seal ring 7, so that the preparation seal ring 82 is completely received in the receiving ring groove 81. The support member 83 is connected to the outflow hole 87, the hollow rubber ring 85 is connected to the inlet hole 88, and the mounting block 89 is threadedly installed in the mounting slot 86. The hollow rubber ring 85 and the mounting block 89 are respectively filled with liquid reactants and solid reactants that can produce chemical reactions and release gas. There are two kinds of reactants, liquid reactants and solid reactants can be acetic acid solution, sodium bicarbonate powder, and sodium hydroxide powder respectively. The two plug holes 810 extend into the reaction tank 812, and the two plug holes 810 are respectively connected to the outflow hole 87 and the inlet hole 88. A one-way valve 811 is installed on the inner thread of the plug hole 810, and the one-way valve 811 corresponding to the outflow hole 87 is opened in one direction toward the support member 83, and the one-way valve 811 corresponding to the inlet hole 88 is opened in one direction toward the installation slot 86, so that the flow direction can be changed.

[0047] By providing the auxiliary sealing assembly 8, when the regular sealing ring 7 leaks, the oil pressure in the cylinder body 1 acts on the hollow rubber ring 85, and the liquid reactant in the hollow rubber ring 85 enters the mounting block 89 to react with the solid reactant to generate a large amount of gas and heat. The gas inside the mounting block 89 increases, and further expands after being heated, and enters the support member 83. The support member 83 is inflated to expand the reserve sealing ring 82, so that the reserve sealing ring 82 fits with the inside of the cylinder body 1, replacing the regular sealing ring 7 to play a sealing role, thereby playing a protective role, avoiding leakage of the piston head 6 during operation, resulting in partial or complete loss of its performance, and improving the stability of equipment use and the safety of work.

[0048] The support member 83 includes an air cushion 831 arranged in the receiving ring groove 81, a fixing sleeve 832 arranged outside the air cushion 831, a hollow bolt 833 arranged inside the fixing sleeve 832, and a connecting air hole 834 arranged between the hollow bolt 833 and the outside of the air cushion 831.

[0049] Specifically, the cross-section of the fixing sleeve 832 is in the shape of an I. The connection between the fixing sleeve 832 and the air cushion 831 is connected by glue. The fixing sleeve 832 passes through the air cushion 831. The hollow bolt 833 passes through the fixing sleeve 832 and extends into the outflow hole 87 and is threadedly connected to the outflow hole 87. The connecting air hole 834 is located in the internal interlayer of the air cushion 831.

[0050] The air cushion 831 is fixed by using a hollow bolt 833, so that the air cushion 831 is firmly confined in the receiving ring groove 81 without affecting the inflation of the air cushion 831, so as to prevent the air cushion 831 from being displaced by air pressure when inflated, and being unable to be inflated continuously, and not being fully expanded, thereby affecting the sealing performance.

[0051] The auxiliary sealing assembly 8 also includes a reaction container 813 arranged inside the reaction tank 812, a receiving port 814 arranged outside the reaction container 813, a placement net tube 815 arranged inside the reaction container 813, a sealing cover 816 arranged at the opening of the placement net tube 815, and a laying mesh plate 817 arranged inside the placement net tube 815.

[0052] Specifically, the reaction container 813 is threadedly connected to the reaction tank 812, and the receiving port 814 is located directly below the plug-in hole 810. The solid reactants are evenly laid in the gap between the laying mesh plates 817. A gap is maintained between the outer wall of the placement mesh tube 815 and the inner wall of the reaction container 813. The laying mesh plates 817 and the placement mesh tube 815 are distributed in a linear array, and one of the laying mesh plates 817 extends to the opening of the placement mesh tube 815, so as to facilitate the separate placement of the two solid reactants.

[0053] By evenly laying the solid reactants in the gaps between the laying mesh plates 817, the surface area of ​​the solid reactants is increased, so that the liquid reactants enter the reaction container 813, and the solid reactants and liquid reactants can react quickly, releasing more gas and heat in a short time, so that the startup reaction speed of the preparatory sealing ring 82 is accelerated, the possibility of leakage of the equipment is reduced, and the safety is higher.

[0054] Example 2, reference Figure 9-10 and Figure 13-14 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a prompt component 9 is arranged inside the reaction container 813, and the prompt component 9 includes an external box 91 arranged inside the reaction container 813, a pendulum 92 arranged inside the external box 91, a cover plate 93 arranged at the opening of the external box 91, a sounding reed 94 arranged on the inner wall of the external box 91 and the surface of the cover plate 93, a ventilation hole 95 arranged on the surface of the cover plate 93, a fixing plug 96 arranged inside the ventilation hole 95, and a connecting rope 97 arranged between the fixing plug 96 and the pendulum 92.

[0055] Specifically, the external box 91 is clamped in the reaction container 813, the pendulum 92 is rotatably installed in the external box 91, the pendulum 92 is located between two sounding reeds 94, and the two sounding reeds 94 are located on the swinging path of the pendulum 92. The cover plate 93 is threadedly connected to the external box 91, and the fixing plug 96 is clamped in the ventilation hole 95.

[0056] By setting up the prompt component 9, the initial connecting rope 97 pulls the pendulum 92 to contact the sounding reed 94 on one side, and the movement of the piston head 6 does not affect the pendulum 92. When a large amount of gas appears in the reaction tank 812, the fixed plug 96 is pushed out of the ventilation hole 95, and the pendulum 92 begins to shake and collide with the sounding reed 94. Such collision will make a sound, which serves as a prompt, and can be handled in time to reduce the possibility of leakage.

[0057] Based on Embodiments 1-2, the working principle of the anti-leakage hydraulic cylinder of the present invention is as follows:

[0058] During normal use, hydraulic oil continuously enters and exits the cylinder body 1 through the oil hole 4, controlling the movement of the piston head 6 and the piston rod 5. The standing sealing ring 7 acts as a seal to separate the two ends of the piston head 6, and the pendulum 92 is pulled by the connecting rope 97, so that it fits with the sounding reed 94 on the surface of the cover plate 93 and cannot move.

[0059] When the standing seal 7 leaks, part of the hydraulic oil flows in from the outside of the standing seal 7, and the oil pressure acts on the surface of the hollow rubber ring 85. The pressure on the outside of the hollow rubber ring 85 increases and compresses it. The hollow rubber ring 85 contracts, and the liquid reactant inside it flows into the inlet hole 88, and then enters the reaction container 813 through the one-way valve 811 and the receiving port 814. The liquid reactant first flows down along the surface of the placement net tube 815, accumulates at the bottom of the reaction container 813, and then penetrates into the placement net tube 815 and contacts the surface of the laying net plate 817. The solid reactants react, during which a large amount of gas is first produced, and then a large amount of heat is produced. At this time, the total amount of gas and the gas volume in the reaction container 813 expand rapidly. These gases enter the outflow hole 87 from the receiving port 814 and the one-way valve 811, and then enter the hollow bolt 833, and flow into the air cushion 831 through the connecting air hole 834. The air cushion 831 is inflated to expand the preliminary sealing ring 82, so that the outer contour of the preliminary sealing ring 82 contacts the cylinder body 1, replacing the regular sealing ring 7 to play a sealing role.

[0060] When the internal air pressure of the reaction container 813 increases, the pressure outside the external box 91 increases, and the fixed plug 96 is pushed into the external box 91, so that the pendulum 92 is no longer restricted. When the piston head 6 moves, the pendulum 92 will swing along, constantly hitting the sounding reeds 94 on both sides, making sounds, and serving as a reminder.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A leak-proof hydraulic cylinder, comprising a cylinder body (1), end covers (2) and a tail cover (3) arranged at both ends of the cylinder body (1), oil holes (4) arranged on the outside of the end covers (2) and the tail cover (3), a piston rod (5) arranged inside the end cover (2), a piston head (6) arranged at one end of the piston rod (5) located inside the cylinder body (1), and a standing seal ring (7) arranged on the outside of the piston head (6), characterized in that: The auxiliary sealing assembly (8) further comprises a receiving ring groove (81) and a mounting ring groove (84) arranged on the outside of the piston head (6), a preliminary sealing ring (82) and a support member (83) arranged inside the receiving ring groove (81), a hollow rubber ring (85) arranged inside the mounting ring groove (84), a mounting slot (86) arranged at the center of the piston head (6), an outflow hole (87) arranged between the mounting slot (86) and the receiving ring groove (81), an inlet hole (88) arranged between the mounting slot (86) and the mounting ring groove (84), a mounting block (89) arranged inside the mounting slot (86), two plug holes (810) arranged outside the mounting block (89), and a reaction groove (812) arranged inside the mounting block (89); The preliminary sealing ring (82) surrounds and wraps around the outer side of the support member (83); the outer contour diameter of the preliminary sealing ring (82) is smaller than the outer wheel diameter of the regular sealing ring (7); the support member (83) is connected to the outflow hole (87); the hollow rubber ring (85) is connected to the inlet hole (88); the hollow rubber ring (85) and the mounting block (89) are respectively filled with liquid reactants and solid reactants that can produce chemical reactions and release gas; the two plug holes (810) both extend into the reaction tank (812); the two plug holes (810) are respectively connected to the outflow hole (87) and the inlet hole (88).

2. The anti-leakage hydraulic cylinder according to claim 1, characterized in that: The regular sealing rings (7) are provided with two, which are respectively distributed at the two ends of the piston head (6), and the reserve sealing ring (82) and the hollow rubber ring (85) are located between the two regular sealing rings (7).

3. The anti-leakage hydraulic cylinder according to claim 2, characterized in that: The edge of the outer contour of the regular sealing ring (7) is provided with a trapezoidal notch.

4. The anti-leakage hydraulic cylinder according to claim 3, characterized in that: The plug hole (810) is internally threadedly installed with a one-way valve (811), and the one-way valve (811) corresponding to the outflow hole (87) is opened in one direction toward the support member (83), and the one-way valve (811) corresponding to the inlet hole (88) is opened in one direction toward the installation slot (86).

5. The anti-leakage hydraulic cylinder according to claim 4, characterized in that: The support member (83) comprises an air cushion (831) arranged in the receiving ring groove (81), a fixing sleeve (832) arranged outside the air cushion (831), a hollow bolt (833) arranged inside the fixing sleeve (832), and a communicating air hole (834) arranged between the hollow bolt (833) and the outside of the air cushion (831); The cross section of the fixing sleeve (832) is in the shape of an I. The fixing sleeve (832) passes through the air cushion (831). The hollow bolt (833) passes through the fixing sleeve (832) and extends into the outflow hole (87), and is threadedly connected to the outflow hole (87).

6. The anti-leakage hydraulic cylinder according to claim 5, characterized in that: The auxiliary sealing assembly (8) further comprises a reaction container (813) disposed inside the reaction tank (812), a receiving port (814) disposed outside the reaction container (813), a placement net cylinder (815) disposed inside the reaction container (813), a sealing cover (816) disposed at the opening of the placement net cylinder (815), and a laying net plate (817) disposed inside the placement net cylinder (815); The receiving port (814) is located directly below the plug hole (810), and the solid reactant is evenly laid in the gap between the laying mesh plates (817), and a gap is maintained between the outer wall of the placement mesh cylinder (815) and the inner wall of the reaction container (813).

7. The anti-leakage hydraulic cylinder according to claim 6, characterized in that: The laying mesh plates (817) and the placement mesh cylinder (815) are distributed in a linear array, and one of the laying mesh plates (817) extends to the opening of the placement mesh cylinder (815).

8. The anti-leakage hydraulic cylinder according to claim 7, characterized in that: The reaction container (813) is provided with a prompting assembly (9) inside the reaction container (813), the prompting assembly (9) comprising an external box (91) arranged inside the reaction container (813), a pendulum (92) arranged inside the external box (91), a cover plate (93) arranged at the opening of the external box (91), a sounding reed (94) arranged on the inner wall of the external box (91) and the surface of the cover plate (93), a ventilation hole (95) arranged on the surface of the cover plate (93), a fixing plug (96) arranged inside the ventilation hole (95), and a connecting rope (97) arranged between the fixing plug (96) and the pendulum (92); The pendulum (92) is located between two sounding reeds (94), and the two sounding reeds (94) are located on the swinging path of the pendulum (92).

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