Hydraulic oil cylinder for jack

Abstract

The utility model discloses a hydraulic oil cylinder for a jack. The hydraulic oil cylinder comprises a cylinder barrel, a cylinder base, a hydraulic jacking assembly and a filtering backflow assembly. The hydraulic jacking assembly comprises an inner barrel, the two ends of the inner barrel are fixedly connected with the cylinder barrel and the cylinder base respectively, a piston rod is slidably assembled in the inner barrel, and the inner barrel, the piston rod and the cylinder base are matched to form a hydraulic jacking cavity. The filtering backflow assembly comprises a liquid return flow channel, a liquid return blocking ball is arranged at the end, away from the hydraulic jacking cavity, of the liquid return flow channel, a communicating flow channel is formed in the cylinder base, the other end of the communicating flow channel communicates with a filtering cavity, a filtering net cylinder is arranged in the filtering cavity, and a recycling flow channel communicates between the filtering cavity and the backflow cavity. According to the hydraulic oil cylinder for the jack, due to the fact that the filtering backflow assembly is arranged, backflow hydraulic oil in the using process of the hydraulic oil cylinder can be filtered, the situation that oil is dirty is reduced, the risk that an oil way is blocked subsequently is reduced, the using stability of the hydraulic oil cylinder for the jack is improved, and the service life of the hydraulic oil cylinder for the jack is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic cylinders for jacks, and in particular relates to a hydraulic cylinder for jacks. Background Art

[0002] Hydraulic cylinders are a type of hydraulic actuator that converts hydraulic energy into mechanical energy. They are widely used in hydraulic systems of various types of machinery due to their simple structure, reliable operation, and smooth movement. Common hydraulic cylinders are mainly composed of cylinder heads, cylinder barrels, pistons, piston rods, sealing devices and other auxiliary accessories. The hydraulic cylinder for a jack is a jack that uses a hydraulic cylinder as a rigid lifting piece.

[0003] Most of the hydraulic cylinders for jacks in the prior art do not have the hydraulic oil filtering function and cannot filter the circulating hydraulic oil, which makes the hydraulic oil in the cylinder easily contaminated by material aging, dust infiltration and its own quality. When the hydraulic oil in the cylinder is contaminated, not only will the lifting noise of the jack become louder, but it will also cause the oil circuit of the hydraulic cylinder for the jack to be blocked, causing the oil temperature of the jack to be too high, which makes the jack's use stability poor and shortens the service life of the hydraulic cylinder for the jack.

[0004] Therefore, in view of the above-mentioned technical problems, it is necessary to provide a kind of hydraulic cylinder for jack.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0006] The utility model aims to provide a hydraulic cylinder for a jack, which can filter the hydraulic oil and prolong the service life of the hydraulic cylinder for the jack.

[0007] In order to achieve the above-mentioned purpose, a specific embodiment of the utility model provides a hydraulic cylinder for a jack, including: a cylinder barrel, a cylinder seat, a hydraulic jacking component, and a filtering reflux component.

[0008] The bottom of the cylinder barrel is fixedly connected with a cylinder seat.

[0009] The hydraulic jacking assembly is assembled on the top of the cylinder seat, and the hydraulic jacking assembly includes an inner cylinder, and the two ends of the inner cylinder are respectively fixedly connected to the cylinder barrel and the cylinder seat, and a piston rod is slidably assembled in the inner cylinder, and the inner cylinder, the piston rod and the cylinder seat cooperate to form a hydraulic jacking chamber, and the cylinder barrel, the inner cylinder and the cylinder seat cooperate to form a reflux chamber, and a jacking liquid inlet channel and a liquid extraction channel are opened at the bottom of the cylinder seat, and the jacking liquid inlet channel is connected to the hydraulic jacking chamber, and the liquid extraction channel is connected to the reflux chamber.

[0010] The filter reflux assembly is fixedly assembled in the cylinder seat, and the filter reflux assembly includes a return liquid flow channel, which is communicated with the hydraulic jacking chamber, and the end of the return liquid flow channel away from the hydraulic jacking chamber is expanded, and a return liquid sealing ball is arranged at the end of the return liquid flow channel away from the hydraulic jacking chamber. A conducting flow channel is excavated in the cylinder seat, one end of the conducting flow channel is communicated with the return liquid flow channel, and the other end of the conducting flow channel is connected to the filter chamber, a filter mesh cylinder is arranged in the filter chamber, and a recovery flow channel is connected between the filter chamber and the reflux chamber.

[0011] In one or more embodiments of the utility model, the inner thread of the piston rod is connected with a threaded connecting rod. The threaded connecting rod plays the role of supporting, fixing and controlling the lifting of the cylinder head. The end of the threaded connecting rod located outside the piston rod is fixedly connected to the cylinder head. The cylinder head supports the object to be lifted.

[0012] In one or more embodiments of the utility model, a compression cylinder is integrally formed on one side of the cylinder seat. The circulating hydraulic oil is stored and compressed by the compression cylinder. A compression piston rod is slidably mounted in the compression cylinder. The hydraulic oil is compressed and transported by controlling the lifting and lowering of the compression piston rod. The compression cylinder and the compression piston rod cooperate to form a hydraulic oil guide chamber.

[0013] In one or more embodiments of the utility model, the two ends of the jacking liquid inlet flow channel are respectively connected to the hydraulic jacking chamber and the hydraulic oil diversion chamber. The hydraulic jacking chamber and the hydraulic oil diversion chamber are connected through the jacking liquid inlet flow channel, so that the hydraulic oil in the hydraulic oil diversion chamber can be transported to the hydraulic jacking chamber along the jacking liquid inlet flow channel, so that the piston rod is lifted under the action of the hydraulic oil. The jacking liquid inlet flow channel is expanded at one end close to the hydraulic jacking chamber, and a liquid inlet sealing ball is arranged at one end of the jacking liquid inlet flow channel close to the hydraulic jacking chamber. The jacking liquid inlet flow channel is guided in one direction by the way that the liquid inlet sealing ball cooperates with the expanded position of the jacking liquid inlet flow channel.

[0014] In one or more embodiments of the utility model, the two ends of the liquid pumping channel are respectively connected to the reflux chamber and the hydraulic oil diversion chamber. The liquid pumping channel serves to connect the reflux chamber and the hydraulic oil diversion chamber, so that the hydraulic oil in the reflux chamber can flow back to the hydraulic oil diversion chamber along the liquid pumping channel under pressure. This provides a basis for the subsequent continuous circulation of hydraulic oil. The liquid pumping channel is flared at one end close to the hydraulic oil diversion chamber, and a liquid pumping sealing ball is arranged at one end of the liquid pumping channel close to the hydraulic oil diversion chamber. The liquid pumping channel is controlled to be unidirectionally conducted by cooperating with the liquid pumping sealing ball and the flared position of the liquid pumping channel.

[0015] In one or more embodiments of the utility model, the outer thread of the cylinder seat is connected to a limit thread rod, and the limit thread rod is arranged in cooperation with the return liquid flow channel. By controlling the rotation of the limit thread rod, the limit thread rod moves under the action of the internal and external threads, thereby limiting the movement of the support spring and the return liquid blocking ball, thereby controlling the conduction state of the return liquid flow channel. A support spring is arranged between the limit thread rod and the return liquid blocking ball, and the conduction flow channel is arranged between the limit thread rod and the return liquid blocking ball. The support spring plays a role in supporting and limiting the return liquid blocking ball.

[0016] In one or more embodiments of the utility model, a mesh tube fixing rod is fixedly connected to the side of the filter mesh tube away from the conducting flow channel. The filter mesh tube is conveniently disassembled and assembled by assembling and fixing the mesh tube fixing rod, which provides convenience for the subsequent cleaning and replacement of the filter mesh tube. The outer side of the mesh tube fixing rod is threadedly connected to a threaded blocking block, and the threaded blocking block is threadedly connected to the cylinder seat. The threaded blocking block serves as an assembly limit for the mesh tube fixing rod. At the same time, the threaded blocking block serves as a blocking limit for the filter chamber.

[0017] In one or more embodiments of the utility model, a disassembly handle is fixedly connected to one end of the threaded sealing block located outside the cylinder seat, and the threaded sealing block is disassembled and assembled by controlling the rotation of the disassembly handle.

[0018] In one or more embodiments of the utility model, the recovery channel is expanded on one side close to the reflux cavity, and a recovery blocking ball is arranged on one end of the recovery channel close to the reflux cavity. The recovery blocking ball and the expanded end of the recovery channel cooperate with each other to control the unidirectional conduction of the recovery blocking ball.

[0019] Compared with the prior art, the utility model discloses a hydraulic cylinder for a jack, which can filter the hydraulic oil that flows back during the use of the hydraulic cylinder by setting a filtering reflux component, thereby reducing the occurrence of oil contamination and the risk of subsequent blockage of the oil circuit, thereby improving the use stability of the hydraulic cylinder for the jack and extending the service life of the hydraulic cylinder for the jack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a three-dimensional diagram of a hydraulic cylinder for a jack in one embodiment of the utility model;

[0022] Figure 2 It is a side sectional view of a hydraulic cylinder for a jack in one embodiment of the utility model;

[0023] Figure 3 for Figure 2 Schematic diagram of the structure at A in the middle;

[0024] Figure 4 for Figure 2 Schematic diagram of the structure at B in the middle;

[0025] Figure 5 It is a top cross-sectional view of a hydraulic cylinder for a jack in one embodiment of the utility model;

[0026] Figure 6 for Figure 5 Schematic diagram of the structure at C in the middle;

[0027] Figure 7 It is a front cross-sectional view of a hydraulic cylinder for a jack in one embodiment of the utility model;

[0028] Figure 8 for Figure 7 Schematic diagram of the structure at D in the middle;

[0029] Fig. 9 This is a three-dimensional view from another angle of a hydraulic cylinder for a jack in one embodiment of the utility model.

[0030] Description of main reference numerals:

[0031] 1-cylinder barrel, 101-cylinder seat, 2-hydraulic jacking assembly, 201-inner barrel, 202-piston rod, 203-jacking liquid inlet channel, 204-extraction liquid channel, 205-threaded connecting rod, 206-cylinder cover, 207-compression cylinder, 208-compression piston rod, 209-liquid inlet sealing ball, 210-extraction liquid sealing ball, 211-anti-off net, 3-filter reflux assembly, 301-return liquid channel, 302-return liquid sealing ball, 303-conduction channel, 304-filter chamber, 305-filter net cylinder, 306-recovery channel, 307-limiting threaded rod, 308-support spring, 309-net cylinder fixing rod, 310-threaded sealing block, 311-disassembly and assembly handle, 312-recovery sealing ball, 313-limiting net. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] like Figures 1 to 9 As shown, a hydraulic cylinder for a jack in one embodiment of the utility model comprises: a cylinder barrel 1, a cylinder base 101, a hydraulic jacking component 2, and a filtering reflux component 3.

[0034] like Figure 1 As shown, a cylinder base 101 is fixedly connected to the bottom of the cylinder barrel 1. The cylinder base 101 plays a role of sealing and assembling the cylinder barrel 1.

[0035] like Figures 2 to 4 As shown, the hydraulic jacking assembly 2 is assembled on the top of the cylinder base 101, and the hydraulic jacking assembly 2 includes an inner cylinder 201, and the two ends of the inner cylinder 201 are respectively fixedly connected to the cylinder 1 and the cylinder base 101. The inner cylinder 201 plays the role of assembly limit and hydraulic jacking for the piston rod 202. At the same time, the inner cylinder 201 cooperates to form a hydraulic jacking chamber.

[0036] like Figure 2 As shown, a piston rod 202 is slidably mounted in the inner cylinder 201. The object to be lifted is lifted by controlling the piston rod 202 to lift.

[0037] Specifically, the inner cylinder 201, the piston rod 202 and the cylinder base 101 cooperate to form a hydraulic lifting chamber. By continuously delivering hydraulic oil into the hydraulic lifting chamber, the piston rod 202 can be lifted under the action of the hydraulic oil liquid pressure.

[0038] It is worth noting that the cylinder barrel 1, the inner barrel 201 and the cylinder base 101 cooperate to form a reflux chamber. By returning the hydraulic oil in the reflux chamber to the compression barrel 207, the liquid pressure and hydraulic oil content in the compression barrel 207 are guaranteed, providing a basis for the subsequent continuous delivery of hydraulic oil to the hydraulic jacking chamber.

[0039] like Figure 2 As shown, the piston rod 202 is internally threadedly connected with a threaded connecting rod 205. The threaded connecting rod 205 supports, fixes and controls the lifting of the cylinder cover 206.

[0040] like Figure 2 As shown, one end of the threaded connecting rod 205 outside the piston rod 202 is fixedly connected to a cylinder cover 206. The cylinder cover 206 supports the object to be lifted.

[0041] like Figures 2 to 3 As shown, a compression cylinder 207 is integrally formed on one side of the cylinder base 101. The compression cylinder 207 is used to store and compress the circulating hydraulic oil.

[0042] like Figures 2 to 3 As shown, a compression piston rod 208 is slidably mounted in the compression cylinder 207. The hydraulic oil is compressed and transported by controlling the lifting and lowering of the compression piston rod 208. The compression cylinder 207 and the compression piston rod 208 cooperate to form a hydraulic oil guide chamber.

[0043] like Figures 2 to 4 As shown, a lifting liquid inlet channel 203 and a liquid extraction channel 204 are excavated at the bottom of the cylinder base 101. The lifting liquid inlet channel 203 is connected to the hydraulic lifting chamber, and the liquid extraction channel 204 is connected to the reflux chamber.

[0044] The two ends of the lifting liquid inlet channel 203 are respectively connected to the hydraulic lifting chamber and the hydraulic oil diversion chamber. The hydraulic lifting chamber and the hydraulic oil diversion chamber are connected through the lifting liquid inlet channel 203, so that the hydraulic oil in the hydraulic oil diversion chamber can be transported to the hydraulic lifting chamber along the lifting liquid inlet channel 203, so that the piston rod 202 is lifted under the action of the hydraulic oil.

[0045] like Figures 2 to 4 As shown, the jacking liquid inlet channel 203 is expanded at one end close to the hydraulic jacking chamber, and a liquid inlet blocking ball 209 is arranged at one end of the jacking liquid inlet channel 203 close to the hydraulic jacking chamber. The liquid inlet blocking ball 209 cooperates with the expanded position of the jacking liquid inlet channel 203 to play a one-way conduction role in the jacking liquid inlet channel 203.

[0046] Specifically, the two ends of the pumping channel 204 are connected to the reflux chamber and the hydraulic oil guide chamber respectively. The pumping channel 204 serves to connect the reflux chamber and the hydraulic oil guide chamber, so that the hydraulic oil in the reflux chamber can flow back to the hydraulic oil guide chamber along the pumping channel 204 under pressure, providing a basis for the subsequent circulation and continuous delivery of the hydraulic oil.

[0047] like Figures 2 to 3 As shown, the pumping channel 204 is expanded at one end close to the hydraulic oil diversion cavity, and a pumping sealing ball 210 is arranged at one end of the pumping channel 204 close to the hydraulic oil diversion cavity. The pumping sealing ball 210 cooperates with the expanded position of the pumping channel 204 to control the pumping channel 204 to conduct unidirectionally.

[0048] like Figures 2 to 4 As shown, one end of the jacking liquid inlet channel 203 located in the hydraulic jacking chamber and one end of the liquid extraction channel 204 located in the hydraulic oil guide chamber are fixedly connected with an anti-slip net 211. The anti-slip net 211 plays a role of preventing the liquid inlet blocking ball 209 and the liquid extraction blocking ball 210 from slipping off and limiting the position, thereby improving the use stability of the liquid inlet blocking ball 209 and the liquid extraction blocking ball 210.

[0049] like Figures 7 and 8 As shown, the filter reflux assembly 3 is fixedly assembled in the cylinder base 101. The filter reflux assembly 3 performs filtering and reflux on the hydraulic oil in the hydraulic jacking chamber, thereby reducing the possibility of oil contamination during the circulation of the hydraulic oil.

[0050] like Figures 2 to 3 As shown, the filter reflux assembly 3 includes a return liquid channel 301, which is in communication with the hydraulic lifting chamber. The hydraulic oil in the hydraulic lifting chamber is refluxed and discharged through the return liquid channel 301, so that the piston rod 202 in the hydraulic lifting chamber is reset as the liquid level drops.

[0051] like Figures 2 to 3 As shown, the end of the return liquid channel 301 away from the hydraulic jacking chamber is expanded, and the end of the return liquid channel 301 away from the hydraulic jacking chamber is provided with a return liquid blocking ball 302. The return liquid blocking ball 302 cooperates with the expanded position of the return liquid channel 301 to control the return liquid channel 301 to conduct unidirectionally.

[0052] like Figures 2 to 3 As shown, the outer side of the cylinder seat 101 is threadedly connected with a limit threaded rod 307, and the limit threaded rod 307 is arranged in cooperation with the return liquid flow channel 301. By controlling the rotation of the limit threaded rod 307, the limit threaded rod 307 moves under the action of the inner and outer threads, thereby limiting the movement of the support spring 308 and the return liquid blocking ball 302, thereby controlling the conduction state of the return liquid flow channel 301.

[0053] like Figures 2 to 3 As shown, a support spring 308 is arranged between the limit threaded rod 307 and the liquid return blocking ball 302, and the conductive flow channel 303 is arranged between the limit threaded rod 307 and the liquid return blocking ball 302. The support spring 308 plays a role of supporting and limiting the liquid return blocking ball 302.

[0054] like Figure 5 to Figure 6 As shown, a conducting flow channel 303 is excavated in the cylinder base 101, and one end of the conducting flow channel 303 is in communication with the return flow channel 301. The conducting flow channel 303 serves to connect the return flow channel 301 with the filter chamber 304, so that the hydraulic oil refluxed in the return flow channel 301 can flow back to the filter chamber 304 along the conducting flow channel 303.

[0055] like Figure 5 to Figure 6 As shown, the other end of the conducting flow channel 303 is connected to a filter chamber 304. The filter chamber 304 is used to limit the assembly of the filter cylinder 305. At the same time, the filter chamber 304 plays a guiding role for the hydraulic oil filtered in the filter cylinder 305.

[0056] like Figures 5 to 8 As shown, a filter screen cylinder 305 is arranged in the filter chamber 304, and the filter screen cylinder 305 matches the liquid inlet of the filter chamber 304. It is convenient to filter impurities in the hydraulic oil delivered to the filter chamber 304 through the filter screen cylinder 305, thereby reducing the situation where impurities flow with the hydraulic oil and cause oil circuit blockage.

[0057] like Figures 5 to 8 As shown, a side of the filter screen cartridge 305 away from the conducting flow channel 303 is fixedly connected with a screen cartridge fixing rod 309. By assembling and fixing the screen cartridge fixing rod 309, the filter screen cartridge 305 is conveniently disassembled and assembled, providing convenience for subsequent cleaning and replacement of the filter screen cartridge 305.

[0058] like Figures 5 to 8 As shown, the outer side of the net tube fixing rod 309 is threadedly connected with a threaded blocking block 310, and the threaded blocking block 310 is threadedly connected to the cylinder seat 101. The threaded blocking block 310 plays a role of assembly limit for the net tube fixing rod 309. At the same time, the threaded blocking block 310 plays a role of blocking and limiting for the filter cavity 304.

[0059] like Figure 1 As shown, one end of the threaded sealing block 310 located outside the cylinder seat 101 is fixedly connected with a disassembly handle 311. The threaded sealing block 310 is disassembled and assembled by controlling the rotation of the disassembly handle 311.

[0060] like Figures 7 and 8As shown, a recovery channel 306 is connected between the filter chamber 304 and the reflux chamber. The recovery channel 306 serves to connect the filter chamber 304 and the reflux chamber, so that the hydraulic oil filtered in the filter chamber 304 is transported to the reflux chamber along the recovery channel 306.

[0061] like Figures 7 and 8 As shown, the recovery channel 306 is expanded on one side close to the reflux cavity, and a recovery blocking ball 312 is arranged on one end of the recovery channel 306 close to the reflux cavity. The recovery blocking ball 312 cooperates with the expanded end of the recovery channel 306 to control the unidirectional conduction of the recovery blocking ball 312.

[0062] like Figures 7 and 8 As shown, one end of the recovery channel 306 located in the reflux cavity is fixedly connected to a limiting net 313. The limiting net 313 plays a role of preventing the recovery blocking ball 312 from falling off.

[0063] In specific use, when it is necessary to control the piston rod 202 to lift, the hydraulic oil in the hydraulic oil guide chamber can be transported to the hydraulic lifting chamber along the lifting liquid inlet channel 203 under the action of the compression piston rod 208 by controlling the compression piston rod 208 to press down. In addition, when the hydraulic oil is transported in the lifting liquid inlet channel 203, the liquid inlet blocking ball 209 moves into the hydraulic lifting chamber under the action of the liquid pressure, and the lifting liquid inlet channel 203 is in a conducting state. At the same time, the liquid pumping blocking ball 210 blocks the liquid pumping channel 204 under the action of the liquid pressure, so that the hydraulic oil in the hydraulic oil guide chamber can only be transported to the hydraulic lifting chamber along the lifting liquid inlet channel 203.

[0064] When the compression piston rod 208 is lifted, the pumping sealing ball 210 moves under the gas pressure in the hydraulic oil diversion chamber, so that the pumping flow channel 204 is in a conducting state, and the lifting liquid inlet flow channel 203 is in a blocked state, so that the hydraulic oil in the reflux chamber can flow back to the hydraulic oil diversion chamber along the pumping flow channel 204. By reciprocating the compression piston rod 208, the hydraulic oil can be continuously delivered to the hydraulic lifting chamber, so that the piston rod 202 can be lifted under the action of liquid pressure.

[0065] When the piston rod 202 needs to be reset, the extension length of the limiting threaded rod 307 can be adjusted by rotating the limiting threaded rod 307, so that the support spring 308 and the return liquid blocking ball 302 can move synchronously with the movement of the limiting threaded rod 307 under the action of the liquid pressure in the hydraulic lifting chamber, so that the return liquid channel 301 is in a conducting state. At this time, the hydraulic oil in the hydraulic lifting chamber is transported to the filter chamber 304 along the return liquid channel 301 and the conducting channel 303.

[0066] Since the filter cylinder 305 is connected to the liquid inlet of the filter chamber 304, the hydraulic oil transported in the conductive flow channel 303 can be directly transported to the filter cylinder 305. The hydraulic oil is filtered by the filter cylinder 305 and then flows back to the pumping flow channel 204, and can also flow back to the reflux chamber along the recovery flow channel 306. By leading out the hydraulic oil in the hydraulic lifting chamber, the piston rod 202 can be gradually reset as the liquid pressure decreases, and the hydraulic oil filtered by the filter cylinder 305 can be recycled, and the adverse effects of dirty oil on the oil circuit are reduced.

[0067] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0068] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hydraulic cylinder for a jack, characterized in that: include: A cylinder barrel, the bottom of which is fixedly connected to a cylinder seat; A hydraulic jacking assembly is mounted above the cylinder seat, the hydraulic jacking assembly comprises an inner cylinder, the two ends of the inner cylinder are respectively fixedly connected to the cylinder barrel and the cylinder seat, a piston rod is slidably mounted in the inner cylinder, the inner cylinder, the piston rod and the cylinder seat cooperate to form a hydraulic jacking chamber, the cylinder barrel, the inner cylinder and the cylinder seat cooperate to form a reflux chamber, a jacking liquid inlet channel and a liquid extraction channel are excavated at the bottom of the cylinder seat, the jacking liquid inlet channel is connected to the hydraulic jacking chamber, and the liquid extraction channel is connected to the reflux chamber; A filter reflux assembly is fixedly assembled in the cylinder seat, and the filter reflux assembly includes a return liquid flow channel, which is communicated with the hydraulic jacking chamber. The end of the return liquid flow channel away from the hydraulic jacking chamber is expanded, and a return liquid sealing ball is arranged at the end of the return liquid flow channel away from the hydraulic jacking chamber. A conducting flow channel is excavated in the cylinder seat, one end of the conducting flow channel is communicated with the return liquid flow channel, and the other end of the conducting flow channel is connected to the filter chamber, a filter mesh cylinder is arranged in the filter chamber, and the filter mesh cylinder is matched with the liquid inlet of the filter chamber, and a recovery flow channel is connected between the filter chamber and the reflux chamber.

2. A hydraulic cylinder for a jack according to claim 1, characterized in that: The inner thread of the piston rod is connected with a threaded connecting rod, and one end of the threaded connecting rod located outside the piston rod is fixedly connected with a cylinder cover.

3. The hydraulic cylinder for a jack according to claim 1, characterized in that: A compression cylinder is integrally formed on one side of the cylinder seat, a compression piston rod is slidably mounted in the compression cylinder, and the compression cylinder cooperates with the compression piston rod to form a hydraulic oil guide chamber.

4. The hydraulic cylinder for a jack according to claim 3, characterized in that: The two ends of the jacking liquid inlet flow channel are respectively connected to the hydraulic jacking chamber and the hydraulic oil guide chamber. The jacking liquid inlet flow channel is expanded at one end close to the hydraulic jacking chamber. A liquid inlet blocking ball is arranged at one end of the jacking liquid inlet flow channel close to the hydraulic jacking chamber.

5. The hydraulic cylinder for a jack according to claim 3, characterized in that: The two ends of the pumping channel are respectively connected to the reflux chamber and the hydraulic oil guide chamber, one end of the pumping channel close to the hydraulic oil guide chamber is expanded, and a pumping sealing ball is arranged at one end of the pumping channel close to the hydraulic oil guide chamber.

6. The hydraulic cylinder for a jack according to claim 1, characterized in that: One end of the jacking liquid inlet flow channel located in the hydraulic jacking cavity and one end of the liquid extraction flow channel located in the hydraulic oil guide cavity are both fixedly connected with an anti-dropping net.

7. The hydraulic cylinder for a jack according to claim 1, characterized in that: The outer side of the cylinder seat is threadedly connected to a limiting threaded rod, the limiting threaded rod is matched with the return liquid flow channel, a supporting spring is arranged between the limiting threaded rod and the return liquid sealing ball, and the conducting flow channel is arranged between the limiting threaded rod and the return liquid sealing ball.

8. The hydraulic cylinder for a jack according to claim 1, characterized in that: A mesh cylinder fixing rod is fixedly connected to the side of the filter mesh cylinder away from the conducting flow channel, a threaded sealing block is threadedly connected to the outer side of the mesh cylinder fixing rod, and the threaded sealing block is threadedly connected to the cylinder seat.

9. The hydraulic cylinder for a jack according to claim 8, characterized in that: One end of the threaded sealing block located outside the cylinder seat is fixedly connected with a disassembly handle.

10. The hydraulic cylinder for a jack according to claim 1, characterized in that: The recovery channel is expanded on one side close to the reflux chamber, a recovery blocking ball is arranged on one end of the recovery channel close to the reflux chamber, and one end of the recovery channel located in the reflux chamber is fixedly connected to the limiting net.

Images