Hydraulic oil cylinder with external protection structure

Abstract

The invention discloses a hydraulic oil cylinder with an external protection structure, and relates to the technical field of straight cylinder hydraulic equipment.The hydraulic oil cylinder comprises an outer cylinder body, the outer surface wall of the outer cylinder body is fixedly sleeved with a primary protection sleeve, the outer surface of the primary protection sleeve is provided with a reverse thrust release mechanism, and the reverse thrust release mechanism comprises a lining frame; a liquid storage ring box is fixedly installed on the outer surface wall of the lining frame, a set of U-shaped alloy frames are fixedly installed on each face of the primary protection sleeve, the number of the U-shaped alloy frames in each set is two, a set of first locking bases are fixedly installed on the outer surface of each U-shaped alloy frame, a soft material is selected as a first pressed face of the mechanism, and a second pressed face of the mechanism is selected as a second pressed face of the mechanism. And meanwhile, the second force unloading assembly adopts a hollow assembly method, so that the impact area of part of protection assemblies on the hydraulic cylinder body is reduced even if the assemblies are pressed and deformed, and the hydraulic cylinder body is prevented from being damaged to the maximum extent.

Description

Technical Field

[0001] The invention relates to the technical field of straight cylinder hydraulic equipment, in particular to a hydraulic oil cylinder with an external protective structure. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] In the prior art, for example, Chinese patent publication number: CN231628567U discloses a hydraulic cylinder with an external protective structure, including a hydraulic cylinder body, a bottom plate is arranged at the bottom of the hydraulic cylinder body, support plates are fixedly connected to both sides of the top of the bottom plate, a protective mechanism is sleeved on the surface of the hydraulic cylinder body, a fixing mechanism is arranged on the top of the bottom plate, the protective mechanism includes a fixing ring, a protective pad, a fixing rod and a movable rod, the fixing ring is arranged on the surface of the hydraulic cylinder body, the protective pad is arranged inside the fixing ring, and the fixing rod is fixed inside the fixing ring.

[0004] However, the above patents have the following deficiencies: 1) The protective components of the equipment are mainly used to deal with external impacts. However, due to structural and material limitations, the components deformed by impact cannot recover slowly, resulting in the front end of some components being in direct contact with the cylinder body, which still increases the probability of cylinder damage.

[0005] 2) Because the protective component cannot achieve self-repair, once damaged, the protection time of the equipment body cannot be extended and needs to be replaced in time. If the time is delayed, the next external force impact will cause the equipment body to suffer double damage from the damaged parts and the impact object, resulting in serious damage to the equipment body.

[0006] 3) The protective components are large in area, which greatly increases the size of the equipment body, making subsequent installation and use more difficult and increasing the limitations of the equipment body.

[0007] Therefore, we propose a hydraulic cylinder with an external protective structure to solve the above-mentioned problems. Summary of the invention

[0008] The purpose of the present invention is to provide a hydraulic cylinder with an external protection structure. Through the reverse thrust release mechanism, the mechanism can perform secondary unloading of external force impact, gradually weaken the initial impact force, and prevent strong impact force from acting on the hydraulic cylinder body. The two layers of unloading components have a high yield strength. The former uses its own material to expand, and the latter uses the characteristic that the yield strength is proportional to its own elastic force. After the foreign object is separated from the equipment, each component can be slowly reset to avoid external force and deformation components from impacting the hydraulic cylinder body at the same time, so as to solve the problems raised by the above-mentioned background technology.

[0009] To achieve the above object, the present invention provides the following technical solution: a hydraulic oil cylinder with an external protective structure, comprising an outer cylinder body, wherein an outer wall fixed sleeve of the outer cylinder body is provided with a primary protective sleeve; The outer surface of the primary protective sleeve is provided with a reverse push release mechanism; The reverse thrust release mechanism includes an inner liner frame, the outer wall of the inner liner frame is fixedly installed with a liquid storage ring box, each surface of the primary protective sleeve is fixedly installed with a group of U-shaped alloy frames, and the number of each group of U-shaped alloy frames is two, and the outer surface of each U-shaped alloy frame is fixedly installed with a group of first locking bases, and the interior of each of the first locking bases is fixedly installed with a first reverse thrust spring, and the force-bearing end of each first reverse thrust spring is fixedly sleeved with an associated sleeve, and the outer walls of multiple groups of associated sleeves are wrapped with buffer foam sleeves, and the interior of each U-shaped alloy frame is fixedly inserted with a group of limiting sleeves, and each One end of the outer wall of the limiting sleeve passes through the outer wall of the liquid storage ring box and is connected with the interior of the liquid storage ring box. A release pipe is movably inserted into the interior of each of the limiting sleeves. A sealing cover plate is fixedly sleeved on one end of the outer wall of each of the release pipes. A second reverse thrust spring is fixedly installed inside each of the sealing cover plates. A second locking base is fixedly sleeved on the outer wall of each of the second reverse thrust springs. The outer wall of each of the second locking bases is connected to the inner wall of the liquid storage ring box. A group of liquid inlet holes are opened on the outer wall of each of the release pipes, and each group of liquid inlet holes is respectively distributed at the tail end of a corresponding release pipe.

[0010] Preferably, a sealing top cover is fixedly installed on the top of the liquid storage ring box, an internal connecting plate is fixedly installed on the inner surface wall of each of the release pipes, a diffusion nozzle is fixedly inserted inside each of the internal connecting plates, and the liquid inlet end of each diffusion nozzle is respectively connected to the interior of a corresponding release pipe.

[0011] Preferably, the outer wall of the outer cylinder body is fixedly connected to the upper base and the lower base, and a connecting valve and a support frame are fixedly installed on one side of the outer wall of the upper base, and an additional pump is fixedly inserted inside the support frame, and the output end of the additional pump is connected to the liquid inlet end of the connecting valve.

[0012] Preferably, the outer wall of the liquid storage ring box is fixedly connected to a group of external joints, and the number of external joints in a group is two, a secondary delivery pipe is fixedly inserted inside each of the external joints, a merging conduit is fixedly connected between the liquid inlet ends of the two secondary delivery pipes, and a central joint is fixedly connected at the center of the merging conduit.

[0013] Preferably, a group of hollow sleeves are fixedly installed inside the upper base, and the number of a group of hollow sleeves is equal to a group of secondary delivery pipes. The discharge end of the connecting valve is fixedly connected to a primary delivery pipe. The discharge end of the primary delivery pipe passes through the outer wall of the center joint and is connected to the interior of the center joint.

[0014] Preferably, an oil seal top cover is fixedly installed on the top of the outer cylinder body, and the top of the oil seal top cover is fixedly connected to an extended empty pipe. An output inner shaft is movably inserted into the interior of the outer cylinder body, and the output inner shaft is movably placed inside the extended empty pipe.

[0015] Preferably, the rear surfaces of the upper base and the lower base are respectively fixedly connected with a first oil guide seat and a second oil guide seat, and an oil guide pipeline is fixedly connected between the first oil guide seat and the liquid inlet end of the electronically controlled oil guide component.

[0016] Preferably, the liner frame fixing sleeve is arranged on the outer wall of the primary protective sleeve, and the outer wall of the second oil guide seat is fixedly installed with an electronically controlled oil guide component, the electronically controlled oil guide component includes an electronically controlled component and an oil pump component, and the discharge end of the oil pump assembly is connected to the interior of the second oil guide seat.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a reverse thrust release mechanism, which can perform secondary force unloading for external force impact, gradually weaken the initial impact force, and prevent strong impact force from acting on the hydraulic cylinder body. The two-layer unloading components have high yield strength. The former uses its own material to expand, and the latter uses the characteristic that the yield strength is proportional to its own elastic force. After the foreign object is separated from the equipment, each component can be slowly reset. The mechanism uses soft material as the first pressure surface, and with the assistance of subsequent components, it gradually completes the unloading of external forces. At the same time, the second unloading component adopts a hollow assembly method. The purpose is to reduce the impact area of ​​some protective components on the hydraulic cylinder body even after the component is compressed and deformed, so as to minimize the damage to the hydraulic cylinder body.

[0018] 2. The present invention sets a reverse thrust release mechanism, which can perform secondary external force offset. The movement of its buffer component can be consistent with the indentation rate of the buffer foam sleeve. At the same time, the release pipe also retracts into the liquid storage ring box synchronously, squeezes the glue in the liquid storage ring box, and with the assistance of the internal hydraulic pressure, forces part of the glue to be released. The glue is accurately injected into the indentation of the buffer foam sleeve by the diffusion nozzle. The uniform dispersion effect of the diffusion nozzle can ensure that the glue fills the damaged part of the buffer foam sleeve. The characteristic of polyurethane glue reacting with moisture or water in the air can be used to quickly form a polyurethane layer at the damaged part of the buffer foam sleeve, and accelerate the hardening of part of the material of the buffer foam sleeve, so that the buffer foam sleeve can regain its protective ability and extend the protection time of the hydraulic cylinder body.

[0019] 3. The present invention presets an independent frame, and places the hydraulic cylinder body inside it. The protective components are installed layer by layer in the independent frame to form a complete body, which greatly reduces the area of ​​exposed parts and ensures that the equipment body can be directly mounted on the main machine. On the one hand, the overall size of the equipment is reduced, and on the other hand, the difficulty of equipment installation is reduced to avoid large limitations on the use of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a main structural stereogram of a hydraulic cylinder with an external protective structure according to the present invention; Figure 2 This is a three-dimensional diagram of the bottom structure of a hydraulic cylinder with an external protective structure of the present invention; Figure 3 This is a three-dimensional diagram of the disassembled structure of a hydraulic cylinder with an external protective structure of the present invention; Figure 4 The hydraulic cylinder with an external protective structure is Figure 3 The enlarged stereogram of the structure at B in the middle; Figure 5 It is an enlarged stereoscopic view of the reverse thrust release mechanism structure in a hydraulic cylinder with an external protection structure of the present invention; Figure 6 The hydraulic cylinder with an external protective structure of the present invention is an enlarged stereoscopic view of the structure A in the base platform below the figure; Figure 7 It is an enlarged stereoscopic diagram of a part of the structure of a hydraulic oil cylinder with an external protective structure of the present invention; Figure 8 It is an enlarged stereoscopic view of the main body of a hydraulic cylinder with an external protective structure of the present invention.

[0021] In the figure: 1, outer cylinder; 2, primary protective sleeve; 3, reverse thrust release mechanism; 301, liner frame; 302, liquid storage ring box; 303, sealing top cover; 304, U-shaped alloy frame; 305, first locking base; 306, first reverse thrust spring; 307, associated sleeve; 308, limit sleeve; 309, second locking base; 310, second reverse thrust spring; 311, blocking cover plate; 312, release pipe; 313, liquid inlet hole; 314, internal plate; 315, expansion Sprinkler; 316, buffer foam sleeve; 317, connecting valve; 318, additional pump; 319, hollow sleeve; 320, external joint; 321, secondary delivery pipeline; 322, combined conduit; 323, center joint; 324, primary delivery pipeline; 325, support frame; 4, upper base; 5, lower base; 6, oil seal top cover; 7, extended empty pipe; 8, output inner shaft; 9, first oil guide seat; 10, second oil guide seat; 11, electronically controlled oil guide assembly; 12, oil guide pipeline. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Please refer to the attached Figure 1 -Attached Figure 8 As shown, the present invention provides a technical solution: a hydraulic cylinder with an external protective structure, comprising an outer cylinder body 1, an outer wall fixed sleeve of the outer cylinder body 1 is provided with a primary protective sleeve 2, and an outer surface of the primary protective sleeve 2 is provided with a reverse thrust release mechanism 3.

[0024] according to Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7As shown, the reverse thrust release mechanism 3 includes an inner liner frame 301, and a liquid storage ring box 302 is fixedly installed on the outer wall of the inner liner frame 301, and each surface of the primary protective sleeve 2 is fixedly installed with a group of U-shaped alloy frames 304, and the number of each group of U-shaped alloy frames 304 is two, and the outer surface of each U-shaped alloy frame 304 is fixedly installed with a group of first locking bases 305, and the interior of each first locking base 305 is fixedly installed with a first reverse thrust spring 306, and the force-bearing end of each first reverse thrust spring 306 is fixedly sleeved with an associated sleeve 307, and the outer walls of multiple groups of associated sleeves 307 are wrapped with a buffer foam sleeve 316, and the interior of each U-shaped alloy frame 304 is fixedly inserted with a group of limiting sleeves 308, and each limiting sleeve One end of the outer wall of the cylinder 308 passes through the outer wall of the liquid storage ring box 302 and is connected to the interior of the liquid storage ring box 302. A release pipe 312 is movably inserted inside each limiting sleeve 308. A sealing cover plate 311 is fixedly sleeved on one end of the outer wall of each release pipe 312. A second reverse thrust spring 310 is fixedly installed inside each sealing cover plate 311. The outer wall of each second reverse thrust spring 310 is fixedly sleeved with a second locking base 309. The outer wall of each second locking base 309 is connected to the inner wall of the liquid storage ring box 302. A group of liquid inlet holes 313 are opened on the outer wall of each release pipe 312, and each group of liquid inlet holes 313 are respectively distributed at the tail end of a corresponding release pipe 312.

[0025] according to Figure 5 , Figure 6 and Figure 7 As shown, a sealing top cover 303 is fixedly installed on the top of the liquid storage ring box 302, an inner plate 314 is fixedly installed on the inner surface wall of each release pipe 312, and a diffusion nozzle 315 is fixedly inserted inside each inner plate 314, and the liquid inlet end of each diffusion nozzle 315 is respectively connected to the interior of a corresponding release pipe 312. By presetting the above components, since the interior of the liquid storage ring box 302 is often in a sealed state, the stored liquid is polyurethane glue with high viscosity, and then the external force squeezes the glue, and it will be sprayed into the channel at high speed under the reverse thrust of air pressure, and the diffusion nozzle 315 can change the direct jet of glue into a scattered emission, the purpose of which is to fully fill the deformed part of the buffer foam sleeve 316 with glue to ensure the formation of a secondary protective structure.

[0026] according to Figure 1 , Figure 2 , Figure 3 and Figure 8As shown, the outer wall of the outer cylinder body 1 is fixedly connected with the upper base 4 and the lower base 5, and the outer wall side of the upper base 4 is fixedly installed with a connecting valve 317 and a support frame 325. The interior of the support frame 325 is fixedly inserted with an additional pump 318, and the output end of the additional pump 318 is connected to the liquid inlet end of the connecting valve 317. By presetting the above components, the liquid inlet and discharge ends of the connecting valve 317 are rotatably connected with open joints, the purpose is to facilitate disassembly and reduce the difficulty of cleaning the retained glue in the connecting valve 317, thereby avoiding blockage of the glue delivery channel.

[0027] according to Figure 4 and Figure 5 As shown, the outer wall of the liquid storage ring box 302 is fixedly connected to a group of external joints 320, and the number of the external joints 320 in a group is two, and a secondary delivery pipe 321 is fixedly inserted inside each external joint 320, and a merging conduit 322 is fixedly connected between the liquid inlet ends of the two secondary delivery pipes 321, and a central joint 323 is fixedly connected at the center of the merging conduit 322. By presetting the above components, a single strand of glue can be evenly drained into each secondary delivery pipe 321, and by increasing the number of channels, the glue delivery load can be reduced, and the filling rate of the liquid storage ring box 302 can be accelerated.

[0028] according to Figure 4 and Figure 8 As shown, a group of hollow sleeves 319 are fixedly installed inside the upper base 4, and the number of a group of hollow sleeves 319 is equal to a group of secondary delivery pipes 321. The discharge end of the connecting valve 317 is fixedly connected to the primary delivery pipe 324. The discharge end of the primary delivery pipe 324 passes through the outer wall of the center joint 323 and is connected to the interior of the center joint 323.

[0029] according to Figure 1 , Figure 2 , Figure 3 and Figure 8 As shown, an oil seal top cover 6 is fixedly installed on the top of the outer cylinder body 1, and an extended empty pipe 7 is fixedly connected to the top of the oil seal top cover 6. An output inner shaft 8 is movably inserted into the interior of the outer cylinder body 1, and the output inner shaft 8 is movably placed inside the extended empty pipe 7.

[0030] according to Figure 8 As shown, the rear surfaces of the upper base 4 and the lower base 5 are respectively fixedly connected with a first oil guide seat 9 and a second oil guide seat 10, and an oil guide pipe 12 is fixedly connected between the first oil guide seat 9 and the liquid inlet end of the electronically controlled oil guide component 11.

[0031] according to Figure 5 and Figure 8As shown, the liner frame 301 is fixedly mounted on the outer wall of the primary protective sleeve 2, and the outer wall of the second oil guide seat 10 is fixedly installed with an electronically controlled oil guide assembly 11, which includes an electronically controlled assembly and an oil pump assembly, and the discharge end of the oil pump assembly is connected to the interior of the second oil guide seat 10.

[0032] The effect achieved by the entire mechanism is: first install the equipment on the designated instrument or main machine, and its conductive outer wire is fully connected to the electronic control component on the electronic control oil guide component 11, so as to provide energy for each electrical component, and then the external oil filling pipe is connected to the oil pump component on the electronic control oil guide component 11, and the glue outer pipe is connected to the input end of the increasing pump 318. The increasing pump 318 is turned on, and the impeller inside it rotates to start glue extraction. The glue is continuously injected into the liquid storage ring box 302 by using the primary delivery pipeline 324 and the secondary delivery pipeline 321 until the internal space of the liquid storage ring box 302 is filled.

[0033] In the buffering and resetting stage, the damage to the outer cylinder 1 can be divided into the load-bearing machinery driving the equipment to actively collide with a stationary object, or the dynamic object probabilistically collides with the equipment body. In both cases, under the intervention of human and external factors, the impact will be quickly disengaged and stopped, and the pressure area and degree of damage applied to the equipment depend on the size and force of the impacting object. When the foreign object hits a certain side of the buffering foam sleeve 316, the pressure point will deform rapidly and sink inwardly by utilizing the material properties of the buffering foam sleeve 316 itself. On the one hand, it will resist part of the impact force of the object and reduce the compressive strength of the lower component. On the other hand, the indentation of the buffering foam sleeve 316 will drive the corresponding part of the first reverse thrust spring 306 to be pressed, and the yield strength of the first reverse thrust spring 306 will be used to maximize the resistance to the impact force of the object. Because the yield strength of the first reverse thrust spring 306 is proportional to its own elastic force, when the object is separated from a certain side of the buffering foam sleeve 316, the reaction force generated by part of the first reverse thrust spring 306 will be directly applied to the indentation of the buffering foam sleeve 316, which can be combined with the expansion of the material itself to slowly reset the indentation of the buffering foam sleeve 316.

[0034] In the secondary repair stage, when part of the first reverse thrust spring 306 is compressed, the buffer foam sleeve 316 embedded in the connected associated sleeve 307 will apply a backward thrust to the front end of the release pipe 312, and utilize the movable connectivity of the limiting sleeve 308 and the release pipe 312 to slowly push part of the release pipe 312 to slide into the liquid storage ring box 302, gradually exposing the liquid inlet hole 313 on the part of the release pipe 312. At the same time, the second reverse thrust spring 310 between the part of the second locking base 309 and the blocking cover plate 311 is in a compressed state. With the help of the release pipe 312 squeezing the glue and the pressure in the liquid storage ring box 302, part of the glue will continue to enter the interior of the release pipe 312 from each group of liquid inlet holes 313, gradually filling the part of the release pipe 312 with glue, and further by the relative Each diffusion nozzle 315 sprays glue to the sunken part of the buffer foam sleeve 316, and the sprayed glue is used to fill the damaged area of ​​the buffer foam sleeve 316. When the sunken part of the buffer foam sleeve 316 is reset, the front end of the partial release pipe 312 loses the external force, and then under the reaction force generated by the second reverse thrust spring 310, the partial release pipe 312 is reset, so that the partial blocking cover plate 311 re-blocks the corresponding limiting sleeve 308 to stop the glue from overflowing. When the glue filled in the wound of the buffer foam sleeve 316 directly contacts the air, it will directly react with moisture or water to quickly form a strong polyurethane layer at the damaged part of the buffer foam sleeve 316. At the same time, part of the material in the buffer foam sleeve 316 will be fixed and harden quickly, so that the buffer foam sleeve 316 can regain its protective ability.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic cylinder with an external protective structure, characterized in that: It comprises an outer cylinder (1), wherein an outer wall fixed sleeve of the outer cylinder (1) is provided with a primary protective sleeve (2); The outer surface of the primary protective sleeve (2) is provided with a reverse push release mechanism (3); The reverse thrust release mechanism (3) comprises an inner lining frame (301), the outer wall of which is fixedly mounted a liquid storage ring box (302), each surface of the primary protective sleeve (2) is fixedly mounted a group of U-shaped alloy frames (304), and the number of each group of U-shaped alloy frames (304) is two, the outer surface of each U-shaped alloy frame (304) is fixedly mounted a group of first locking bases (305), the interior of each first locking base (305) is fixedly mounted a first reverse thrust spring (306), the force-bearing end of each first reverse thrust spring (306) is fixedly sleeved with an associated sleeve (307), the outer walls of the plurality of groups of associated sleeves (307) are wrapped with a buffer foam sleeve (316), the interior of each U-shaped alloy frame (304) is fixedly inserted with a group of limiting sleeves (308), and each limiting sleeve (308) is fixedly sleeved with a first locking base (305). One end of the outer wall of the sleeve (308) penetrates the outer wall of the liquid storage ring box (302) and is connected to the interior of the liquid storage ring box (302); a release pipe (312) is movably inserted into the interior of each of the limiting sleeves (308); a blocking cover plate (311) is fixedly sleeved on one end of the outer wall of each of the release pipes (312); a second reverse thrust spring (310) is fixedly installed inside each of the blocking cover plates (311); a second locking base (309) is fixedly sleeved on the outer wall of each of the second reverse thrust springs (310); the outer wall of each of the second locking bases (309) is connected to the inner wall of the liquid storage ring box (302); a group of liquid inlet holes (313) are opened on the outer wall of each of the release pipes (312), and each group of liquid inlet holes (313) is respectively distributed at the tail end of a corresponding release pipe (312).

2. The hydraulic cylinder with an external protective structure according to claim 1, characterized in that: A sealing top cover (303) is fixedly mounted on the top of the liquid storage ring box (302); an inner connecting plate (314) is fixedly mounted on the inner surface wall of each of the release pipes (312); a diffusion nozzle (315) is fixedly inserted inside each of the inner connecting plates (314); and a liquid inlet end of each diffusion nozzle (315) is respectively connected to the inside of a corresponding release pipe (312).

3. The hydraulic cylinder with an external protective structure according to claim 1, characterized in that: The outer wall of the outer cylinder body (1) is fixedly connected to an upper base (4) and a lower base (5), and a connecting valve (317) and a support frame (325) are fixedly installed on one side of the outer wall of the upper base (4). An increasing pump (318) is fixedly inserted inside the support frame (325), and the output end of the increasing pump (318) is connected to the liquid inlet end of the connecting valve (317).

4. The hydraulic cylinder with an external protective structure according to claim 3, characterized in that: The outer wall of the liquid storage ring box (302) is fixedly connected to a group of external joints (320), and the number of the external joints (320) in a group is two. A secondary delivery pipeline (321) is fixedly inserted inside each of the external joints (320). A merging conduit (322) is fixedly connected between the liquid inlet ends of the two secondary delivery pipelines (321), and a central joint (323) is fixedly connected to the center of the merging conduit (322).

5. The hydraulic cylinder with an external protective structure according to claim 4, characterized in that: A group of hollow sleeves (319) is fixedly installed inside the upper base (4), and the number of the group of hollow sleeves (319) is equal to the number of the group of secondary delivery pipes (321). The discharge end of the connecting valve (317) is fixedly connected to the primary delivery pipe (324), and the discharge end of the primary delivery pipe (324) passes through the outer wall of the middle joint (323) and is connected to the inside of the middle joint (323).

6. The hydraulic cylinder with an external protective structure according to claim 1, characterized in that: An oil seal top cover (6) is fixedly mounted on the top of the outer cylinder body (1), and an extended hollow tube (7) is fixedly connected to the top of the oil seal top cover (6). An output inner shaft (8) is movably inserted into the interior of the outer cylinder body (1), and the output inner shaft (8) is movably placed inside the extended hollow tube (7).

7. The hydraulic cylinder with an external protective structure according to claim 3, characterized in that: The rear surfaces of the upper base (4) and the lower base (5) are respectively fixedly connected to a first oil guide seat (9) and a second oil guide seat (10), and an oil guide pipe (12) is fixedly connected between the first oil guide seat (9) and the liquid inlet end of the electronically controlled oil guide component (11).

8. The hydraulic cylinder with an external protective structure according to claim 7, characterized in that: The liner frame (301) is fixedly sleeved on the outer wall of the primary protective sleeve (2), and an electric-controlled oil-conducting assembly (11) is fixedly mounted on the outer wall of the second oil-conducting seat (10). The electric-controlled oil-conducting assembly (11) includes an electric-controlled assembly and an oil pump assembly, and a discharge end of the oil pump assembly is connected to the interior of the second oil-conducting seat (10).

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