Oil cylinder with self-lubricating system

Abstract

The invention discloses an oil cylinder with a self-lubricating system. The oil cylinder comprises a piston seat, a cylinder barrel, a piston rod and a plunger rod. Two sets of piston sealing rings are arranged on the outer wall of the piston seat and define a lubricating area with the inner wall of the cylinder barrel, an annular filling groove is further formed in the outer wall of the piston seat, and an annular oil filtering cavity and an annular compression cavity are formed in the inner side. The annular oil filter cavity is divided into an oil collection area and an oil storage area through an annular filter screen, and the annular compression cavity is divided into an oil injection area and an action area through an annular piston. The lubricating area and the annular oil filtering cavity are filled with lubricating oil, the oil collecting area collects the lubricating oil, and the oil storage area supplements the filtered lubricating oil to the oil injection area and injects the lubricating oil into the lubricating area through the annular filling groove. The plunger rod is fixed to the axis of the rear end cover, the sliding through groove is communicated with the acting area, the plunger rod extrudes a gas medium when sliding, the annular piston is pushed to inject lubricating oil into the lubricating area, and cyclic utilization of the lubricating oil is achieved. The performance and the reliability of the oil cylinder are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, in particular to an oil cylinder with a self-lubricating system. Background Art

[0002] As a common hydraulic actuator, the cylinder is widely used in engineering machinery, aerospace, automobile manufacturing and other fields. Its core function is to promote the telescopic movement of the piston rod by filling and discharging hydraulic oil, thereby realizing the posture adjustment or power output of the mechanical device. However, in the long-term operation of traditional cylinders, the friction problem between the piston and the inner wall of the cylinder has always been a difficult to overcome technical bottleneck. Due to the direct contact between the piston and the cylinder, especially under high pressure, high speed or frequent reciprocating motion conditions, it is easy to cause increased friction loss, which in turn causes equipment wear, seal failure and even cylinder jamming. This not only reduces the service life of the cylinder, but also increases maintenance costs and downtime risks.

[0003] In order to solve the above problems, the prior art usually adopts an external lubrication system or a method of regularly manually adding lubricating oil to reduce the friction between the piston and the cylinder. However, the external lubrication system has a complex structure, occupies a large space, and requires an additional power source and control device, which increases the complexity and cost of the system. The manual method of adding lubricating oil has problems such as uneven lubrication and untimely filling, which is difficult to meet the requirements of high precision and high reliability. In addition, the traditional lubrication method is also prone to impurities mixed in the lubricating oil, resulting in a decrease in lubrication effect, and even blocking the oil circuit, further aggravating the wear of the equipment. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a cylinder with a self-lubricating system, which effectively solves the technical problems of lubrication of traditional cylinders through innovative structural design and lubrication system integration, and has multiple beneficial effects such as efficient lubrication, reduced friction, recycling of lubricating oil, compact structure, and improved sealing, thereby significantly improving the performance and reliability of the cylinder.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: an oil cylinder with a self-lubricating system, including a matching combination of a cylinder barrel, a front end cover, a rear end cover, and a fixed combination of a piston seat and a piston rod, the front end cover and the rear end cover are sealingly assembled at the front and rear ends of the cylinder barrel, the piston seat is slidably installed in the cylinder barrel, and the piston rod and the front end cover maintain a sliding plug-in connection.

[0006] The outer wall seal of the piston seat is equipped with two groups of piston sealing rings, and the piston sealing rings, the inner wall of the cylinder and the inner wall of the piston form a lubrication area. The outer wall of the piston seat is provided with an annular filling groove arranged between the two groups of piston sealing rings, and the inner side of the piston seat is provided with an annular oil filter chamber and an annular compression chamber arranged in sequence from the outside to the inside. The annular oil filter chamber is divided into an oil collecting area and an oil storage area by an annular filter installed therein, and the annular compression chamber is divided into an oil injection area and an action area by an annular piston installed therein.

[0007] The lubrication area and the annular oil filter cavity are filled with lubrication oil, the oil collecting area is connected to the lubrication area and is used to collect the lubrication oil in the lubrication area, the oil storage area is connected to the oil filling area and is used to add the filtered lubrication oil to the oil filling area, and the oil filling area is connected to the annular filling groove and is used to inject the lubrication oil in the oil filling area into the lubrication area through the annular filling groove.

[0008] It also includes a plunger rod fixed at the axis of the rear end cover, a sliding groove is opened at the axis of the piston seat and the piston rod, the sliding groove and the action area are filled with gas medium, the plunger rod is slidably installed in the sliding groove, and the front end of the sliding groove is kept in communication with the action area.

[0009] On the basis of the above technical solution, in order to facilitate the processing of the annular oil filter cavity and the annular compression cavity in the piston seat, and to realize the stable installation of the annular filter screen and the annular piston therein, the following technical solution is provided: The piston seat includes a front seat body, an annular seat, and a rear seat body which are arranged in sequence and fixedly combined, the piston rod is fixedly connected to the front side end of the front seat body, the annular seat is sealed and fitted with the front seat body and the rear seat body, an outer sleeve is fixedly connected to the inner side end of the front seat body, an inner end of the rear seat body is provided with an inner ring groove and an outer ring groove which are arranged in sequence from the inside to the outside, the inner side end of the rear seat body is also fixedly connected to an inner sleeve which is arranged on the inner side of the inner ring groove, the inner sleeve is arranged on the inner side of the outer sleeve and is sealed and fitted with the front seat body, the outer sleeve, inner sleeve, and inner ring groove enclose the annular compression chamber, the annular seat, outer sleeve, and outer ring groove enclose the annular oil filter chamber, and the annular filter is nested and installed at the port of the outer ring groove.

[0010] On the basis of the above technical solution, in order to realize the connection of the chambers in the piston seat and ensure the stable flow of lubricating oil according to the design requirements, the following technical solution is provided: The annular filling groove is arranged on the outer side wall of the annular seat, and the piston sealing ring is nested and installed at the connection between the annular seat and the front seat body and the rear seat body. The annular seat is provided with radial through grooves arranged on both sides of the annular filling groove and used to connect the lubrication area and the oil collection area, and the radial through grooves are arranged on the inner side of the piston sealing ring.

[0011] The rear seat body is provided with a plurality of connecting passages A distributed in a circular array, and the connecting passages A are connected with the outer ring groove and the inner ring groove; the rear seat body and the annular seat are provided with a plurality of connecting passages B distributed in a circular array, and the connecting passages B are connected with the inner ring groove and the annular filling groove.

[0012] On the basis of the above technical solution, in order to limit the lubricating oil in the oil storage area from flowing into the oil filling area through the connecting passage A in one direction, and to limit the lubricating oil in the oil filling area from flowing into the annular filling groove in one direction through the connecting passage B, the following technical solution is provided: A one-way valve A is installed at the connection between the connecting passage A and the outer annular groove, and the one-way valve A is used to control the lubricating oil in the oil storage area to flow into the oil filling area in one direction. A one-way valve B is installed at the connection between the connecting passage B and the inner annular groove, and the one-way valve B is used to control the lubricating oil in the oil filling area to flow into the annular filling groove in one direction.

[0013] On the basis of the above technical solution, in order to ensure that the plunger rod can be installed in the sliding groove in a sliding combination manner, and the relative displacement of the plunger rod can exert a force on the gas medium in the action area and the sliding groove, the following technical solution is provided: The sliding through groove is opened to the axis of the front seat body, the rear seat body and the piston rod. The piston rod is provided with an axial through groove arranged on the periphery of the sliding through groove. The axial through groove is connected to the action area and keeps communication with the front end of the sliding through groove.

[0014] On the basis of the above technical solution, in order to facilitate the processing of the axial through groove and realize the connection between the axial through groove and the front end of the sliding through groove, the following technical solution is provided: The front end of the piston rod is provided with an assembly seat, and the inner end of the assembly seat is fixedly connected with a threaded column A which is screwed to the front end of the sliding groove. The inner end of the assembly seat is provided with an annular groove arranged on the periphery of the threaded column A, and the annular groove is connected with the axial groove. The front end of the piston rod is provided with an axial recessed groove arranged on the inner wall of the sliding groove. The inner end of the assembly seat is also provided with a radial connecting groove, and the radial connecting groove is connected with the annular groove and the axial recessed groove.

[0015] On the basis of the above technical solution, in order to ensure that the piston rod and the rear end cover can be connected to the working parts respectively, the following technical solution is provided: The assembly seat is equipped with a front connecting piece, the rear side end of the rear end cover is fixedly connected with a rear connecting piece, and the front connecting piece and the rear connecting piece are respectively provided with a front assembly through opening and a rear assembly through opening.

[0016] On the basis of the above technical solution, in order to ensure that the front connecting piece can be connected and assembled with the assembly seat, and at the same time facilitate its disassembly and assembly to facilitate the assembly of the piston rod, the following technical solution is provided: A threaded column B is fixedly connected to the front side end of the assembly seat, a positioning cover is screwed on the threaded column B, a rotating seat is rotatably installed in the positioning cover, a threaded column C arranged on the outside of the positioning cover is fixedly connected to the rotating seat, and the front connecting piece is screwed to the threaded column C.

[0017] On the basis of the above technical solution, in order to realize filling or discharging hydraulic oil to both sides of the piston seat in the cylinder through the front cover and the rear cover, the following technical solution is provided: An oil supply interface A is provided in the front end cover, and an oil supply interface B is provided in the rear end cover. Both the oil supply interface A and the oil supply interface B are connected to the inner cavity of the cylinder and the external environment.

[0018] Beneficial effects of the present invention: 1. Efficient lubrication and friction reduction: By setting an annular filling groove, annular oil filter chamber and annular compression chamber on the piston seat, automatic filling and recycling of lubricating oil are realized. When the piston seat contracts, the plunger rod pushes the gas medium to squeeze the annular piston, and the lubricating oil is injected into the lubrication area through the annular filling groove, which effectively reduces the friction between the piston seat and the inner wall of the cylinder, and avoids rigid collision and equipment wear.

[0019] 2. Lubricating oil recycling and filtration: The lubrication system realizes automatic filtration and recycling of lubricating oil through the design of annular oil filter chamber and annular filter screen. The lubricating oil in the lubrication area enters the oil collection area under pressure, enters the oil storage area after being filtered by the filter screen, and then flows back to the oil injection area through the connecting passage, ensuring the cleanliness and fluidity of the lubricating oil and extending the service life of the lubricating oil.

[0020] 3. Compact structure and high integration: The lubrication system is integrated into the piston seat. Through the split piston seat design (front seat body, annular seat, rear seat body) and modular assembly method, the efficient integration of the lubrication system is achieved. This design not only simplifies the overall structure of the cylinder, but also reduces manufacturing and maintenance costs.

[0021] 4. One-way flow control and improved sealing: By setting one-way valve A and one-way valve B in connecting passage A and connecting passage B, the one-way flow of lubricating oil is ensured, and the backflow and leakage of lubricating oil are avoided. At the same time, through the design of sealing components A and sealing components B, the sealing performance of the piston rod and the plunger rod is further improved, ensuring the stable operation of the lubrication system.

[0022] 5. Wide application range and high reliability: The lubrication system of this solution is suitable for a variety of working conditions, especially in scenarios of high pressure, high speed or frequent reciprocating motion. It can effectively reduce friction loss and improve the operating reliability and service life of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of another perspective of the present invention; Figure 3 It is a schematic diagram of the structure of the present invention in a cutaway state; Figure 4 It is a cross-sectional schematic diagram of the present invention; Figure 5 A detailed schematic diagram of the piston seat; Figure 6 for Figure 5 Schematic diagram of the structure in disassembled state; Figure 7 It is a structural schematic diagram of the front end of the piston rod; Figure 8 for Figure 7 Schematic diagram of the structure with key components disassembled.

[0024] In the figure: 1 cylinder barrel, 2 front end cover, 21 sealing assembly A, 22 oil supply interface A, 3 rear end cover, 31 rear connector, 311 rear assembly port, 32 oil supply interface B, 41 piston seat, 411 piston seal ring, 412 annular filling groove, 4131 annular filter, 4132 oil collection area, 4133 oil storage area, 4141 annular piston, 4142 oil filling area, 4143 action area, 415 lubrication area, 416 front seat body, 4161 outer sleeve, 417 annular seat, 4171 radial through groove, 418 rear seat body, 4181 inner ring groove , 4182 outer ring groove, 4183 inner sleeve, 4191 connecting passage A, 4192 connecting passage B, 4193 sealing plug, 4194 one-way valve A, 4195 one-way valve B, 42 piston rod, 421 axial through groove, 422 axial countersunk groove, 43 sliding through groove, 431 sealing component B, 44 assembly seat, 441 threaded column A, 442 annular through groove, 443 radial connecting groove, 444 threaded column B, 445 positioning cover, 446 rotating seat, 447 threaded column C, 45 front connecting piece, 451 front assembly port, 5 plunger rod. DETAILED DESCRIPTION

[0025] 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 described embodiments 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.

[0026] Example 1 See also Figure 1-Figure 5 A cylinder with a self-lubricating system includes a matching combination of a cylinder barrel 1, a front end cover 2, a rear end cover 3, and a fixed combination of a piston seat 41 and a piston rod 42. The front end cover 2 and the rear end cover 3 are sealed and assembled at the front and rear ends of the cylinder barrel 1. The piston seat 41 is slidably installed in the cylinder barrel 1, and the piston rod 42 and the front end cover 2 are kept in sliding connection.

[0027] The front end cover 2 and the rear end cover 3 are both sealed and fitted with the inner wall of the end of the cylinder barrel 1, and are fixedly combined by a bolt assembly arranged on the periphery to form a sealed piston chamber in the cylinder barrel 1. The piston seat 41 and the piston rod 42 are assembled into the cylinder barrel 1 before the front end cover 2 and the rear end cover 3, and the outer wall of the piston seat 41 is sealed and fitted with the inner wall of the cylinder barrel 1, and the piston rod 42 is sealed and fitted with the front end cover 2. By filling or discharging hydraulic oil at both ends of the cylinder barrel 1, the sliding of the piston seat 41 and the piston rod 42 in the cylinder barrel 1 can be controlled, thereby adjusting the telescopic posture of the cylinder.

[0028] The outer wall of the piston seat 41 is sealed with two groups of piston sealing rings 411, and the piston sealing rings 411 and the inner wall of the cylinder 1 and the inner wall of the piston form a lubrication area 415. The outer wall of the piston seat 41 is provided with an annular filling groove 412 arranged between the two groups of piston sealing rings 411, and the inner side of the piston seat 41 is provided with an annular oil filter chamber and an annular compression chamber arranged in sequence from the outside to the inside. The annular oil filter chamber is divided into an oil collecting area 4132 and an oil storage area 4133 by an annular filter screen 4131 installed therein, and the annular compression chamber is divided into an oil injection area 4142 and an action area 4143 by an annular piston 4141 installed therein.

[0029] Lubricating oil is added to the lubrication area 415 and the annular oil filter chamber, the oil collecting area 4132 is connected to the lubrication area 415 and is used to collect the lubricating oil in the lubrication area 415, the oil storage area 4133 is connected to the oil filling area 4142 and is used to add the filtered lubricating oil to the oil filling area 4142, and the oil filling area 4142 is connected to the annular filling groove 412 and is used to inject the lubricating oil in the oil filling area 4142 into the lubrication area 415 through the annular filling groove 412.

[0030] It also includes a plunger rod 5 fixed at the axis of the rear end cover 3, a sliding groove 43 is opened at the axis of the piston seat 41 and the piston rod 42, the sliding groove 43 and the action area 4143 are filled with gas medium, the plunger rod 5 is slidably installed in the sliding groove 43, and the front end of the sliding groove 43 is kept in communication with the action area 4143.

[0031] When the piston seat 41 and the piston rod 42 contract, that is, when the piston seat 41 and the piston rod 42 move toward the side of the rear end cover 3, the plunger rod 5 moves into the sliding groove 43 and then squeezes the gas medium (the gas medium can be nitrogen or helium with stable properties, and the filling pressure is controlled) to push the annular piston 4141 to move toward the oil filling area 4142, and then the lubricating oil in the oil filling area 4142 is transported to the lubrication area 415 through the annular filling groove 412 to lubricate the gap between the outer wall of the piston seat 41 and the inner wall of the cylinder 1 and the piston sealing ring 411, so as to achieve smooth operation of the piston seat 41 in the cylinder 1 and avoid rigid collision between the cylinder 1 and the piston seat 41, which may cause equipment damage or affect the service life.

[0032] When the lubricating oil is added to the lubricating area 415, the lubricating oil originally contained in the lubricating area 415 and containing impurities enters the oil collecting area 4132 of the annular oil filter cavity under the action of pressure. The lubricating oil entering the oil collecting area 4132 can pass through the annular filter screen 4131 and enter the oil storage area 4133 for filtration and storage.

[0033] When the piston seat 41 and the piston rod 42 extend, that is, the piston seat 41 and the piston rod 42 move toward the side of the rear end cover 3, the plunger rod 5 will extend out of the sliding groove 43 to reduce the pressure on the side of the action area 4143. Under the action of the pressure difference, the annular piston 4141 moves toward the side of the action area 4143, and the lubricating oil in the oil storage area 4133 flows back to the oil injection area 4142. The reciprocating movement can realize the circulation of the lubricating oil, thereby achieving sufficient lubrication of the piston seat 41 and the inner wall of the cylinder 1.

[0034] Example 2 See also Figure 3-Figure 6 In order to facilitate the processing of the annular oil filter cavity and the annular compression cavity in the piston seat 41, and to realize the stable installation of the annular filter screen 4131 and the annular piston 4141 therein, the following technical solutions are provided: The piston seat 41 includes a front seat body 416, an annular seat 417, and a rear seat body 418, which are sequentially arranged and fixedly assembled. The piston rod 42 is fixedly connected to the front side end of the front seat body 416. The annular seat 417 maintains a sealing fit with the front seat body 416 and the rear seat body 418. An outer sleeve 4161 is fixedly connected to the inner side end of the front seat body 416. The inner side end of the rear seat body 418 is provided with an inner ring groove 4181 and an outer ring groove 4182 arranged sequentially from the inside to the outside. The rear seat body 418 The inner end is also fixedly connected to an inner sleeve 4183 arranged on the inner side of the inner annular groove 4181. The inner sleeve 4183 is arranged on the inner side of the outer sleeve 4161 and maintains a sealed contact with the front seat body 416. The outer sleeve 4161, the inner sleeve 4183 and the inner annular groove 4181 form an annular compression chamber. The annular seat 417, the outer sleeve 4161 and the outer annular groove 4182 form an annular oil filter chamber. The annular filter screen 4131 is nested and installed at the port of the outer annular groove 4182.

[0035] The piston seat 41 is designed as a three-section split structure, which can facilitate the processing of the annular oil filter chamber and the annular compression chamber in the piston seat 41, and realize the effective assembly of the annular filter 4131 and the annular piston 4141. The front seat body 416, the annular seat 417, and the rear seat body 418 are fixedly combined by bolts, and sealing rings are installed at each fitting position to ensure the sealing effect of the connection part.

[0036] The annular oil filter chamber is fixedly connected by the outer ring groove 4182, the annular seat 417 and the outer sleeve 4161 to achieve stable installation in the annular filter 4131 and filter the lubricating oil.

[0037] In order to achieve the communication between the chambers in the piston seat 41 and ensure that the lubricating oil flows stably according to the design requirements, the following technical solutions are provided: The annular filling groove 412 is arranged on the outer side wall of the annular seat 417, and the piston sealing ring 411 is nested and installed at the connection between the annular seat 417 and the front seat body 416 and the rear seat body 418. The annular seat 417 is provided with radial through grooves 4171 arranged on both sides of the annular filling groove 412 and used to connect the lubrication area 415 and the oil collecting area 4132. The radial through groove 4171 is arranged on the inner side of the piston sealing ring 411.

[0038] The rear seat body 418 is provided with a plurality of connecting passages A4191 distributed in a circular array, and the connecting passages A4191 are connected with the outer ring groove 4182 and the inner ring groove 4181; the rear seat body 418 and the annular seat 417 are provided with a plurality of connecting passages B4192 distributed in a circular array, and the connecting passages B4192 are connected with the inner ring groove 4181 and the annular filling groove 412.

[0039] The radial grooves 4171 are arranged on both sides of the annular filling groove 412 and on the inner side of the piston sealing ring 411. After the annular filling groove 412 inputs the lubricating oil into the lubrication area 415, the original lubricating oil is blocked by the piston sealing ring 411 and flows along the radial grooves 4171 into the oil collecting area 4132 for filtering.

[0040] The connecting passage A4191 and the connecting passage B4192 are both radially drilled along the outer side of the rear seat body 418 or the annular seat 417, and axially drilled on the end faces of the rear seat body 418 and the annular seat 417 so that the drilled holes are connected, thereby enabling the oil injection area 4142 to be connected with the oil storage area 4133 and the annular filling groove 412.

[0041] During the assembly stage, the radially drilled openings on the rear seat body 418 are sealed by sealing plugs 4193 to prevent leakage of lubricating oil.

[0042] In order to limit the lubricating oil in the oil storage area 4133 from flowing into the oil filling area 4142 in one direction through the connecting passage A4191, and to limit the lubricating oil in the oil filling area 4142 from flowing into the annular filling groove 412 in one direction through the connecting passage B4192, the following technical solutions are provided: A one-way valve A4194 is installed at the connection between the connecting passage A4191 and the outer annular groove 4182. The one-way valve A4194 is used to control the lubricating oil in the oil storage area 4133 to flow into the oil filling area 4142 in one direction. A one-way valve B4195 is installed at the connection between the connecting passage B4192 and the inner annular groove 4181. The one-way valve B4195 is used to control the lubricating oil in the oil filling area 4142 to flow into the annular filling groove 412 in one direction.

[0043] Assembly interfaces are provided at the connection locations of the connecting passage A4191, the connecting passage B4192 and the inner annular groove 4181, the outer annular groove 4182. The one-way valve A4194 and the one-way valve B4195 are fixed in the corresponding assembly interfaces by screwing, thereby controlling the one-way flow of lubricating oil.

[0044] Example 3 See also Figure 3-Figure 6 , Figure 8 In order to ensure that the plunger rod 5 can be installed in the sliding groove 43 in a sliding combination manner, and the relative displacement of the plunger rod 5 can exert a force on the gas medium in the action area 4143 and the sliding groove 43, the following technical solutions are provided: The sliding groove 43 is opened to the axis of the front seat body 416, the rear seat body 418, and the piston rod 42. The piston rod 42 is provided with an axial groove 421 arranged on the periphery of the sliding groove 43. The axial groove 421 is connected to the action area 4143 and maintains communication with the front end of the sliding groove 43.

[0045] When the plunger rod 5 slides relative to the sliding groove 43 , the pressure change of the gas medium can act on the action area 4143 through the axial groove 421 , so as to drive the annular piston 4141 to slide stably in the annular compression chamber.

[0046] A sealing component A21 is installed on the inner side of the front end cover 2 to maintain a sealing fit with the piston rod 42, and a sealing component B431 is installed on the rear side end of the sliding groove 43 (in the rear seat body 418) to maintain a sealing fit with the plunger rod 5. The sealing components A21 and B431 are both composed of a combination of multi-type sealing rubber rings, which can ensure the sealing effect of the piston rod 42 and the plunger rod 5 when they are sliding.

[0047] In order to facilitate the processing of the axial through groove 421 and realize the communication between the axial through groove 421 and the front end of the sliding through groove 43, the following technical solutions are provided: An assembly seat 44 is provided at the front side end of the piston rod 42, and a threaded column A441 is fixedly connected to the inner side end of the assembly seat 44 and is screwed to the front side end of the sliding groove 43. An annular groove 442 is provided at the inner side end of the assembly seat 44 and is arranged on the periphery of the threaded column A441. The annular groove 442 is connected to the axial groove 421. An axial recessed groove 422 is provided at the front side end of the piston rod 42 and is arranged on the inner wall of the sliding groove 43. A radial connecting groove 443 is also provided at the inner side end of the assembly seat 44. The radial connecting groove 443 is connected to the annular groove 442 and the axial recessed groove 422.

[0048] The setting of the axial countersunk groove 422 can ensure the normal screw connection combination of the threaded column A441 and the sliding groove 43, and can also cooperate with the radial connecting groove 443 to realize the connection between the sliding groove 43 and the annular groove 442, while the annular groove 442 can realize the connection between the axial groove 421. The distribution and design of each groove body structure can be drilled separately on the corresponding components, thereby ensuring the connection effect between the sliding groove 43 and the annular compression chamber in the piston seat 41.

[0049] A sealing ring needs to be installed at the fitting portion between the assembly seat 44 and the front end of the piston rod 42 to ensure the sealing effect at the joint, thereby ensuring the airtight effect of the sliding groove 43 and the action area 4143.

[0050] Example 4 See also Figure 1-Figure 4 , Figure 7 In order to ensure that the piston rod 42 and the rear end cover 3 can be connected to the working parts respectively, the following technical solutions are provided: A front connecting member 45 is mounted on the assembly seat 44 , and a rear connecting member 31 is fixedly connected to the rear end of the rear cover 3 . A front assembly opening 451 and a rear assembly opening 311 are respectively formed on the front connecting member 45 and the rear connecting member 31 .

[0051] The front assembly opening 451 and the rear assembly opening 311 can be connected and combined with the components they act on in a hinged manner, so as to achieve posture adjustment of the related components during the telescopic movement of the cylinder.

[0052] On the basis of the above technical solution, in order to ensure that the front connecting member 45 can be connected and assembled with the assembly seat 44, and to facilitate its disassembly and assembly to facilitate the assembly of the piston rod 42, the following technical solution is provided: A threaded column B444 is fixedly connected to the front side end of the assembly seat 44, a positioning cover 445 is screwed on the threaded column B444, a rotating seat 446 is rotatably installed in the positioning cover 445, a threaded column C447 arranged on the outside of the positioning cover 445 is fixedly connected to the rotating seat 446, and the front connecting piece 45 is screwed on the threaded column C447.

[0053] The screwed combination of the positioning cover 445 and the threaded column B444 can realize the effective positioning of the rotating seat 446, and then the installation combination of the front connecting member 45 is realized through the threaded column C447, so that the front connecting member 45 can be assembled to the assembly seat 44 in a manner that it can rotate freely around the axis, so as to ensure that the front connecting member 45 can be effectively connected to the action component.

[0054] Example 5 See also Figure 3 , Figure 4 In order to realize filling or discharging hydraulic oil to both sides of the piston seat 41 in the cylinder 1 through the front cover 2 and the rear cover 3, the following technical solutions are provided: An oil supply interface A22 is provided in the front cover 2, and an oil supply interface B32 is provided in the rear cover 3. Both the oil supply interface A22 and the oil supply interface B32 are connected to the inner cavity of the cylinder 1 and the external environment.

[0055] The oil supply interface A22 and the oil supply interface B32 are both processed into L-shaped structures by drilling, and are respectively connected to the side walls and end walls of the front cover 2 and the rear cover 3, providing stable filling or draining interfaces without affecting the stable operation of other components. After being connected to the hydraulic oil system, the telescopic posture of the cylinder can be effectively controlled.

[0056] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0057] 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. An oil cylinder with a self-lubricating system, comprising a matched combination of a cylinder barrel (1), a front end cover (2), a rear end cover (3), and a fixed combination of a piston seat (41) and a piston rod (42), wherein the front end cover (2) and the rear end cover (3) are sealingly assembled at the front and rear ends of the cylinder barrel (1), the piston seat (41) is slidably mounted in the cylinder barrel (1), and the piston rod (42) and the front end cover (2) are kept in a slidable plug connection; Features: The outer wall of the piston seat (41) is sealed with two groups of piston sealing rings (411), and the piston sealing rings (411) and the inner wall of the cylinder barrel (1) and the inner wall of the piston form a lubrication area (415). The outer wall of the piston seat (41) is provided with an annular filling groove (412) arranged between the two groups of piston sealing rings (411). The inner side of the piston seat (41) is provided with an annular oil filter chamber and an annular compression chamber arranged in sequence from the outside to the inside. The annular oil filter chamber is divided into an oil collection area (4132) and an oil storage area (4133) by an annular filter (4131) installed therein, and the annular compression chamber is divided into an oil injection area (4142) and an action area (4143) by an annular piston (4141) installed therein. It also includes a plunger rod (5) fixed at the axis of the rear end cover (3), a sliding groove (43) is opened at the axis of the piston seat (41) and the piston rod (42), the sliding groove (43) and the action area (4143) are filled with gas medium, the plunger rod (5) is slidably installed in the sliding groove (43), and the front end of the sliding groove (43) is connected to the action area (4143).

2. The oil cylinder with a self-lubricating system according to claim 1, characterized in that: The piston seat (41) comprises a front seat body (416), an annular seat (417), and a rear seat body (418) which are sequentially arranged and fixedly assembled. The piston rod (42) is fixedly connected to the front side end of the front seat body (416). The annular seat (417) is kept in sealing contact with the front seat body (416) and the rear seat body (418). An outer sleeve (4161) is fixedly connected to the inner side end of the front seat body (416). The inner side end of the rear seat body (418) is provided with an inner annular groove (4181) and an outer annular groove (4182) which are sequentially arranged from the inside to the outside. The rear seat body (418 ) is also fixedly connected to the inner end of the front seat body (416) with an inner sleeve (4183) arranged on the inner side of the inner annular groove (4181); the inner sleeve (4183) is arranged on the inner side of the outer sleeve (4161) and maintains a sealed contact with the front seat body (416); the outer sleeve (4161), the inner sleeve (4183) and the inner annular groove (4181) enclose the annular compression chamber; the annular seat (417), the outer sleeve (4161) and the outer annular groove (4182) enclose the annular oil filter chamber; the annular filter screen (4131) is nested and installed at the port of the outer annular groove (4182).

3. The oil cylinder with a self-lubricating system according to claim 2, characterized in that: The annular filling groove (412) is arranged on the outer side wall of the annular seat (417); the piston sealing ring (411) is nested and installed at the connection between the annular seat (417) and the front seat body (416) and the rear seat body (418); the annular seat (417) is provided with radial through grooves (4171) arranged on both sides of the annular filling groove (412) and used to connect the lubrication area (415) and the oil collection area (4132); the radial through grooves (4171) are arranged on the inner side of the piston sealing ring (411); The rear seat body (418) is provided with a plurality of connecting passages A (4191) distributed in a ring array, and the connecting passages A (4191) are connected to the outer ring groove (4182) and the inner ring groove (4181); the rear seat body (418) and the annular seat (417) are provided with a plurality of connecting passages B (4192) distributed in a ring array, and the connecting passages B (4192) are connected to the inner ring groove (4181) and the annular filling groove (412).

4. The oil cylinder with a self-lubricating system according to claim 3, characterized in that: A one-way valve A (4194) is installed at the connection between the connecting passage A (4191) and the outer annular groove (4182), and the one-way valve A (4194) is used to control the lubricating oil in the oil storage area (4133) to flow into the oil filling area (4142) in one direction. A one-way valve B (4195) is installed at the connection between the connecting passage B (4192) and the inner annular groove (4181), and the one-way valve B (4195) is used to control the lubricating oil in the oil filling area (4142) to flow into the annular filling groove (412) in one direction.

5. The oil cylinder with a self-lubricating system according to claim 3, characterized in that: The sliding groove (43) is opened to the axis of the front seat body (416), the rear seat body (418) and the piston rod (42), and the piston rod (42) is provided with an axial groove (421) arranged on the periphery of the sliding groove (43). The axial groove (421) is connected to the action area (4143) and maintains communication with the front end of the sliding groove (43).

6. The oil cylinder with a self-lubricating system according to claim 5, characterized in that: The front end of the piston rod (42) is provided with an assembly seat (44), the inner end of the assembly seat (44) is fixedly connected with a threaded column A (441) which is screwed to the front end of the sliding groove (43), the inner end of the assembly seat (44) is provided with an annular groove (442) arranged on the periphery of the threaded column A (441), the annular groove (442) is communicated with the axial groove (421), the front end of the piston rod (42) is provided with an axial recessed groove (422) arranged on the inner wall of the sliding groove (43), the inner end of the assembly seat (44) is also provided with a radial connecting groove (443), the radial connecting groove (443) is communicated with the annular groove (442) and the axial recessed groove (422).

7. The oil cylinder with a self-lubricating system according to claim 6, characterized in that: A front connecting piece (45) is mounted on the assembly seat (44), a rear connecting piece (31) is fixedly connected to the rear end of the rear cover (3), and a front assembly opening (451) and a rear assembly opening (311) are respectively formed on the front connecting piece (45) and the rear connecting piece (31).

8. The oil cylinder with a self-lubricating system according to claim 7, characterized in that: A threaded column B (444) is fixedly connected to the front side end of the assembly seat (44), a positioning cover (445) is screwed onto the threaded column B (444), a rotating seat (446) is rotatably mounted in the positioning cover (445), a threaded column C (447) arranged on the outside of the positioning cover (445) is fixedly connected to the rotating seat (446), and the front connecting member (45) is screwed to the threaded column C (447).

9. The oil cylinder with a self-lubricating system according to claim 1, characterized in that: The front end cover (2) is provided with an oil supply interface A (22), and the rear end cover (3) is provided with an oil supply interface B (32), and the oil supply interface A (22) and the oil supply interface B (32) are both connected to the inner cavity of the cylinder barrel (1) and the external environment.

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