Engineering hydraulic oil cylinder with self-cleaning device

Abstract

The invention belongs to the technical field of hydraulic oil cylinders, and particularly relates to an engineering hydraulic oil cylinder with a self-cleaning device, which comprises a hydraulic oil cylinder consisting of a cylinder body, a cylinder cover, a cylinder head and a piston rod, and a cleaning module mounted on the cylinder head, the cleaning module comprises a cylinder plug and a cleaning unit; the cylinder plug is fixedly connected with the cylinder head through the flange plate, and the cleaning unit is movably connected with the cylinder plug. The cleaning module is arranged to clean the piston rod, and the scraping plate in the cleaning unit can be used for scraping impurities such as oil stains on the surface of the piston rod and residual metal chippings in the oil stains when the piston rod retracts, so that the metal chippings can be separated from the piston rod, it is ensured that the impurities are brought into a cylinder body as little as possible when the piston rod retracts, and the service life of the piston rod is prolonged. In addition, residual oil stains on the surface of the piston rod are further cleaned through a dustproof gasket on the inner side of the cylinder plug, and it is guaranteed that impurities and metal scraps attached to the surface of the piston rod cannot be brought into a cylinder body in the reciprocating telescopic motion of the piston rod.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic cylinders, and specifically relates to an engineering hydraulic cylinder with a self-cleaning device. Background Art

[0002] A hydraulic cylinder is simply called a hydraulic actuator. A hydraulic actuator basically consists of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffering device and an exhaust device. A hydraulic actuator is a hydraulic actuator that converts hydraulic energy into mechanical energy and makes linear reciprocating motion or swinging motion.

[0003] Existing patents such as the patent with the publication number CN118775369A disclose a hydraulic cylinder with self-cleaning function and temperature reduction, including a hydraulic cylinder and a cleaning mechanism. When the piston rod of the hydraulic cylinder moves, the cleaning mechanism is synchronously driven to move, so that the cleaning mechanism cleans the surface of the cylinder body of the hydraulic cylinder; a caking removal mechanism is arranged on the piston rod of the hydraulic cylinder, and the caking removal mechanism is used to clean the caking on the surface of the piston rod of the hydraulic cylinder. When the piston rod of the hydraulic cylinder expands and contracts, the cleaning mechanism is driven to slide on the cylinder body of the hydraulic cylinder. During the sliding process, the sliding sleeve can scrape off the dirt attached to the surface of the cylinder body, avoiding poor heat dissipation of the cylinder body. In addition, when the piston rod expands and contracts, the arc-shaped scraping block can scrape off foreign objects and caking on the surface of the piston rod, avoiding affecting the surface of the piston rod and also avoiding damaging the sealing ring on the hydraulic cylinder.

[0004] In the above prior art, first, when the piston rod retracts, the arc-shaped scraping block disengages from the piston rod. That is to say, the above prior art only realizes the surface cleaning when the piston rod outputs. Then, when the piston rod retracts after being exposed for a long time, how to clean the impurities contaminated on the surface? Secondly, the inner arc surface of the arc-shaped scraping block is ground in the above prior art. Although it has a certain effect, the metal chips generated by the grinding of the arc-shaped scraping block and the impurities remaining from the cleaning all remain in the fixed sleeve and cannot be removed in time, which increases the risk of scratching the surface of the piston rod.

[0005] Therefore, the present invention provides an engineering hydraulic cylinder with a self-cleaning device. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is: An engineering hydraulic cylinder with a self-cleaning device according to the present invention includes a hydraulic cylinder composed of a cylinder body, a cylinder head, a cylinder head and a piston rod, and

[0008] a cleaning module installed on the cylinder head;

[0009] The cleaning module includes a cylinder plug and a cleaning unit; the cylinder plug is fixedly connected to the cylinder head through a flange, and the cleaning unit is movably connected to the cylinder plug;

[0010] The piston rod penetrates through the cleaning module, and the piston rod sequentially penetrates through the cylinder plug and the cleaning unit;

[0011] A scraper is arranged in the cleaning unit, and the scraper is used for scraping impurities on the surface of the piston rod.

[0012] Preferably, the cleaning unit further includes a tray cover and a bearing tray, the bearing tray is movably connected to the cylinder plug; the scraper is hinged on the bearing tray; the tray cover is fixedly connected to the bearing tray through screws, and the piston rod penetrates through the tray cover.

[0013] Preferably, a plurality of movable blocks are slidably connected to the bearing tray, and the displacement trajectories of the plurality of movable blocks are all located on the connection line between the movable block and the center of the bearing tray; the movable blocks are used to drive the scraper to closely adhere to the piston rod.

[0014] Preferably, a fixed disk is fixedly connected to the end of the piston rod, and a plurality of connecting rods are fixedly connected to the outer circle of the fixed disk; one end of the connecting rod is fixedly connected to the fixed disk, and the other end is fixedly connected with an auxiliary disk; the auxiliary disk is slidably connected to the outer surface of the cylinder body;

[0015] A wing plate is fixedly connected to the connecting rod, and the wing plate is used for extruding the movable block.

[0016] Preferably, a first relief groove is provided on the cylinder plug corresponding to the wing plate, and a second relief groove is provided on the bearing tray corresponding to the wing plate; the wing plate and the connecting rod slide in the first relief groove and the second relief groove following the telescopic movement of the piston rod.

[0017] Preferably, a plurality of sliding grooves are provided at one end of the bearing tray facing the cylinder plug, and a plurality of dial rods are fixedly connected to one end of the cylinder plug corresponding to the bearing tray; the dial rods are slidably connected in the sliding grooves; a spring is arranged between the bearing tray and the cylinder plug, and the bearing tray is movably connected to the cylinder plug through the spring.

[0018] Preferably, the sliding groove is of an L-shaped structure. When the spring is not stressed, the dial rod is located at the tail end of the sliding groove. When the spring is stressed, the dial rod slides from the tail end of the sliding groove to the head end of the sliding groove.

[0019] Preferably, a slag discharge groove is provided adjacent to the movable block on the bearing tray, and the slag discharge groove is used for carrying impurities. When the dial rod returns from the head end of the sliding groove to the tail end of the sliding groove, the slag discharge groove rotates with the bearing tray to discharge slag.

[0020] Preferably, the wing plate is of a trapezoidal structure, and the wing plate is fixedly connected to the middle of the connecting rod.

[0021] Preferably, a plurality of mounting grooves are equidistantly arranged on the auxiliary disk, and the mounting grooves are staggered with the connection parts of the connecting rod and the auxiliary disk; spring balls are arranged in the mounting grooves, and the spring balls are used for the smooth movement of the auxiliary disk.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. For the engineering hydraulic cylinder with a self-cleaning device of the present invention, by setting a cleaning module to clean the piston rod, using the scraper in the cleaning unit, when the piston rod retracts, it can scrape off the oil stains on the surface of the piston rod and impurities such as metal chips remaining in the oil stains, so that the metal chips can be separated from the piston rod, thereby ensuring that as little impurity as possible is brought into the cylinder body when the piston rod retracts. In addition, the dust-proof gasket inside the cylinder plug is used to further clean the remaining oil stains on the surface of the piston rod, ensuring that the impurities and metal chips stained on the surface of the piston rod will not be brought into the cylinder body during the reciprocating telescopic movement of the piston rod.

[0024] 2. For the engineering hydraulic cylinder with a self-cleaning device of the present invention, by setting a spring, when the spring is stressed, the distance between the bearing tray and the cylinder plug gradually decreases, and the lever on the circumferential surface of the cylinder plug also slides in the chute on the bearing tray. Specifically, the lever slides from the tail end of the chute to the head end of the chute. And because the chute is of an L-shaped structure, when the lever slides from the tail end of the chute to the head end of the chute, the bearing tray will rotate at a certain angle relative to the cylinder plug. Based on the rotation of the bearing tray, the impurities stored between the bearing tray and the tray cover can be thrown out, avoiding the accumulation of impurities inside the bearing tray and the tray cover and causing scratches on the surface of the piston rod. Description of the Drawings

[0025] The present invention will be further described below with reference to the drawings.

[0026] Figure 1 is the three-dimensional view of the present invention;

[0027] Figure 2 is the partial front view of the present invention;

[0028] Figure 3 is Figure 2 the sectional view at A-A in

[0029] Figure 4 is the partial structural schematic diagram of the present invention;

[0030] Figure 5 is the schematic diagram of the cleaning module of the present invention;

[0031] Figure 6 is the top view of the cleaning module of the present invention;

[0032] Figure 7 is Figure 6Cross-sectional view taken along line B-B in [the figure];

[0033] Figure 8 is a side view of the present invention;

[0034] Figure 9 is Figure 8 cross-sectional view taken along line C-C in [the figure];

[0035] In the figure: 101, cylinder block; 102, piston rod; 103, cylinder head cover; 104, cylinder head; 105, fixing plate; 106, connecting rod; 107, fin plate; 108, auxiliary plate; 1081, mounting groove; 109, spring ball; 201, cylinder plug; 2011, first relief groove; 2012, lever; 202, bearing tray; 2021, second relief groove; 2022, slag discharge groove; 2023, movable block; 2024, scraper; 2025, chute; 203, tray cover; 204, spring. Detailed implementation manners

[0036] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0037] As Figures 1 to 9As shown in the figure, an engineering hydraulic cylinder with a self-cleaning device according to an embodiment of the present invention includes a hydraulic cylinder composed of a cylinder block 101, a cylinder head 103, a cylinder head 104, and a piston rod 102, and a cleaning module installed on the cylinder head 104; the cleaning module includes a cylinder plug 201 and a cleaning unit; the cylinder plug 201 is fixedly connected to the cylinder head 104 through a flange, and the cleaning unit is movably connected to the cylinder plug 201; the cylinder plug 201 is a part of the cleaning module, and a dust-proof gasket is provided inside it to serve as the last protection and cleaning measure for the piston rod 102 to retract into the cylinder block 101; the piston rod 102 penetrates through the cleaning module, and the piston rod 102 sequentially penetrates through the cylinder plug 201 and the cleaning unit; a scraper 2024 is provided inside the cleaning unit, and the scraper 2024 is used to scrape off impurities on the surface of the piston rod 102; since the cleaning of the hydraulic cylinder in the prior art cannot clean the piston rod 102 when the piston rod 102 retracts, and the impurities or metal chips separated from the piston rod 102 cannot be removed in time after cleaning to avoid scratching the piston rod 102 when the piston rod 102 retracts. In view of the above, in an embodiment of the present invention, a cleaning module is preferentially provided to clean the piston rod 102. Specifically, by using the scraper 2024 inside the cleaning unit, when the piston rod 102 retracts, the oil stains and impurities such as residual metal chips in the oil stains on the surface of the piston rod 102 can be scraped off, so that the metal chips can be separated from the piston rod 102, thereby ensuring that as few impurities as possible are brought into the cylinder block 101 when the piston rod 102 retracts. In addition, the dust-proof gasket inside the cylinder plug 201 is used to further clean the remaining oil stains on the surface of the piston rod 102, ensuring that the impurities and metal chips adhered to the surface of the piston rod 102 are not brought into the cylinder block 101 during the reciprocating telescopic movement of the piston rod 102.

[0038] As Figures 4 to 7 shown, the cleaning unit further includes a tray cover 203 and a bearing tray 202, and the bearing tray 202 is movably connected to the cylinder plug 201; the scraper 2024 is hinged on the bearing tray 202; the tray cover 203 is fixedly connected to the bearing tray 202 by screws, and the piston rod 102 penetrates through the tray cover 203; since the inside of the cleaning unit needs to have a space to accommodate the scraper 2024, in an embodiment of the present invention, based on the tray cover 203 and the bearing tray 202 forming the outer shell of the cleaning unit, the scraper 2024 is hingedly installed inside the bearing tray 202. When the scraper 2024 scrapes off the impurities on the surface of the piston rod 102, the fallen impurities can be temporarily stored in the space between the tray cover 203 and the bearing tray 202.

[0039] As Figures 4 to 7As shown in the figure, a plurality of movable blocks 2023 are slidably connected to the bearing tray 202, and the displacement trajectories of the plurality of movable blocks 2023 are all located on the connection line between the movable block 2023 and the center of the bearing tray 202; the movable block 2023 is used to drive the scraper 2024 to be close to the piston rod 102; during the reciprocating telescopic movement of the piston rod 102, it can drive the movable block 2023 on the bearing tray 202, and based on the movement of the movable block 2023, the function of pressing the scraper 2024 against the piston rod 102 is realized. When the scraper 2024 approaches and presses against the surface of the piston rod 102, due to the retraction of the piston rod 102, a relative movement is generated with the scraper 2024, realizing the cleaning of the impurities on the surface of the piston rod 102; in addition, in an embodiment of the present invention, three scrapers 2024 are provided, and the three scrapers 2024 can cover the entire circumferential surface of the piston rod 102, so as to realize the cleaning of the surface of the piston rod 102. In addition, other numbers of scrapers 2024 can also be set to realize the cleaning of the surface of the piston rod 102.

[0040] As Figures 1 to 4 shown in the figure, a fixed disk 105 is fixedly connected to the end of the piston rod 102, and a plurality of connecting rods 106 are fixedly connected to the outer circle of the fixed disk 105; one end of the connecting rod 106 is fixedly connected to the fixed disk 105, and the other end is fixedly connected to an auxiliary disk 108; the auxiliary disk 108 is slidably connected to the outer surface of the cylinder block 101; a fin 107 is fixedly connected to the connecting rod 106, and the fin 107 is used to squeeze the movable block 2023; when the piston rod 102 retracts, the surface of the piston rod 102 is cleaned synchronously without using external power drive. Since the use environment of the hydraulic cylinder is generally outdoors, it is not suitable to set an external storage battery. On the one hand, it does not meet the specifications, and on the other hand, it is easy to be damaged. In an embodiment of the present invention, in order to clean the surface of the piston rod 102 when it retracts, through the fixed disk 105 fixed to the end of the piston rod 102 and the connecting rod 106 connected to the fixed disk 105, when the piston rod 102 retracts, it will drive the connecting rod 106 to move together. The displacement of the connecting rod 106 will drive the fin 107 to move accordingly. During the movement of the fin 107, it will squeeze the movable block 2023 and drive the movable block 2023 to squeeze the scraper 2024, so that the scraper 2024 can scrape off the impurities on the surface of the piston rod 102. Among them, the auxiliary disk 108 is used to connect the connecting rod 106, and the auxiliary disk 108 slides on the outer peripheral surface of the cylinder block 101. In addition, the fixed disk 105 and the auxiliary disk 108 are both allowed to be disassembled (not shown), which is convenient for the improvement of the existing hydraulic cylinder.

[0041] As Figures 4 to 7As shown, a first relief groove 2011 is formed in the cylinder plug 201 corresponding to the wing plate 107, and a second relief groove 2021 is formed in the bearing tray 202 corresponding to the wing plate 107; the wing plate 107 and the connecting rod 106 are slidably connected in the first relief groove 2011 and the second relief groove 2021 following the telescopic movement of the piston rod 102; in order to facilitate the displacement of the wing plate 107 along with the connecting rod 106 and the piston rod 102, a groove for the wing plate 107 to slide needs to be formed in the conventional cylinder block 101. In an embodiment of the present invention, since the cylinder plug 201 and the cleaning unit are both components detachably installed on the existing hydraulic cylinder, therefore, in order to facilitate the displacement of the wing plate 107, a first relief groove 2011 and a second relief groove 2021 need to be formed on the cylinder plug 201 and the bearing tray 202 respectively, so as not to hinder the wing plate 107 when the wing plate 107 displaces along with the piston rod 102. Among them, an infrared sensor can be arranged in the groove formed in the cylinder block 101 for the wing plate 107 to slide, so as to monitor the distance between the wing plate 107 and the bottom of the groove. By comparing the values monitored by the infrared sensors at the bottoms of multiple grooves, it can be judged whether multiple connecting rods 106 and wing plates 107 are eccentric, and then a judgment can be made on whether the piston rod 102 is eccentric. It should be noted that when impurities or metal debris enter the cylinder block 101, it will cause eccentric wear of the guide sleeve, thereby causing the piston rod 102 to be eccentric. If not controlled and maintained, it will reduce the service life of the hydraulic cylinder. Based on the above, through the numerical value monitored by the infrared sensor at the bottom of the groove, it can be analyzed whether the piston rod 102 is eccentric, and a maintenance period can be set to ensure the normal use of the hydraulic cylinder.

[0042] As Figures 1 to 7As shown, one end of the supporting tray 202 facing the cylinder plug 201 is provided with a plurality of sliding grooves 2025, and a plurality of shifting rods 2012 are fixedly connected to one end of the cylinder plug 201 corresponding to the supporting tray 202; the shifting rods 2012 are slidably connected in the sliding grooves 2025; a spring 204 is arranged between the supporting tray 202 and the cylinder plug 201, and the supporting tray 202 is movably connected to the cylinder plug 201 via the spring 204; in order to prevent the supporting tray 202 from sliding randomly, the supporting tray 202 and the cylinder plug 201 are movably connected by the spring 204. In an embodiment of the present invention, the spring 204 between the supporting tray 202 and the cylinder plug 201, in addition to connecting the supporting tray 202 and the cylinder plug 201, can also provide a certain elastic potential energy for the supporting tray 202. It should be noted that when the movable block 2023 is not stressed, that is, when the spring 204 is not stressed, there is a large gap between the supporting tray 202 and the cylinder plug 201, and the shifting rods 2012 on the circumferential surface of the cylinder plug 201 are also at the tail end of the sliding groove 2025 at the end of the supporting tray 202. When the movable block 2023 is stressed, that is, when the spring 204 is stressed, the distance between the supporting tray 202 and the cylinder plug 201 gradually decreases, and the shifting rods 2012 on the circumferential surface of the cylinder plug 201 also slide in the sliding groove 2025 on the supporting tray 202. Specifically, the shifting rods 2012 slide from the tail end of the sliding groove 2025 to the head end of the sliding groove 2025. During the process of the spring 204 being stressed as described above, based on the cooperation between the shifting rods 2012 and the sliding grooves 2025, the supporting tray 202 can be movably connected to the cylinder plug 201, so that during the reciprocating telescopic movement of the piston rod 102, the cleaning unit can be kept near the position of the cylinder head 104, thereby realizing the preliminary cleaning of the piston rod 102. If the cleaning unit is not connected to the cylinder plug 201, the cleaning unit may be displaced along with the piston rod 102, reducing the cleaning effect.

[0043] As Figures 1 to 7 shown, the sliding groove 2025 is of an L-shaped structure. When the spring 204 is not stressed, the shifting rod 2012 is located at the tail end of the sliding groove 2025. When the spring 204 is stressed, the shifting rod 2012 slides from the tail end of the sliding groove 2025 to the head end of the sliding groove 2025; as described above, when the spring 204 is stressed, the distance between the supporting tray 202 and the cylinder plug 201 gradually decreases, and the shifting rods 2012 on the circumferential surface of the cylinder plug 201 also slide in the sliding groove 2025 on the supporting tray 202. Specifically, the shifting rod 2012 slides from the tail end of the sliding groove 2025 to the head end of the sliding groove 2025. And because the sliding groove 2025 is of an L-shaped structure, when the shifting rod 2012 slides from the tail end of the sliding groove 2025 to the head end of the sliding groove 2025, the supporting tray 202 will rotate at a certain angle relative to the cylinder plug 201. Based on the rotation of the supporting tray 202, the impurities stored between the supporting tray 202 and the tray cover 203 can be thrown out, avoiding the problem that the impurities accumulate inside the supporting tray 202 and the tray cover 203 and cause scratches on the surface of the piston rod 102.

[0044] like Figures 4 to 7 As shown, a slag unloading groove 2022 is provided on the support tray 202 adjacent to the movable block 2023, and the slag unloading groove 2022 is used to carry impurities, and when the lever 2012 is reset from the head end of the slide groove 2025 to the tail end of the slide groove 2025, the slag unloading groove 2022 rotates with the support tray 202 to unload slag; when the spring 204 is stressed and the distance between the support tray 202 and the cylinder plug 201 is gradually reduced, since the lever 2012 slides in the slide groove 2025, the support tray 202 will rotate at a certain angle, and rely on the slag unloading groove 2022 to throw the stored impurities into the support tray 202, so as to prevent impurities or metal debris from accumulating between the support tray 202 and the tray cover 203, and during the reciprocating telescopic movement of the piston rod 102, it will contact with the peripheral surface of the piston rod 102, scratch the peripheral surface of the piston rod 102, and even wear the guide sleeve, causing excessive wear on one side of the guide sleeve and causing the piston rod 102 to be eccentric.

[0045] like Figures 1 to 7 As shown, the fin plate 107 is a trapezoidal structure, and the fin plate 107 is fixedly connected to the middle part of the connecting rod 106; since the movable block 2023 is in the bearing tray 202, the connecting rod 106 cannot directly contact the movable block 2023 when the piston rod 102 moves, and the fin plate 107 is required to achieve the purpose of squeezing the movable block 2023. In one embodiment of the present invention, the fin plate 107 is set to a trapezoidal structure, that is, slopes are set on both sides. When the fin plate 107 moves back and forth with the piston rod 102, based on the setting of the slope, the fin plate 107 can also easily contact the movable block 20 23, and at the same time, squeezes the movable block 2023 to move centripetally, thereby realizing the function of pressing the scraper 2024 against the piston rod 102. In addition, the fin plate 107 is arranged in the middle of the connecting rod 106. The purpose is that when the fin plate 107 is separated from the movable block 2023, since the movable block 2023 is no longer under pressure, that is, when the spring 204 is not under force, the elastic potential energy of the spring 204 and the connection relationship between the lever 2012 and the slide groove 2025 can make the tray 202 rotate in the opposite direction, and then the impurities and metal debris stored in the tray 202 and the tray cover 203 can be quickly thrown out through the slag discharge chute 2022.

[0046] like Figures 8 to 9As shown, a plurality of mounting grooves 1081 are equidistantly arranged on the auxiliary disk 108, and the mounting grooves 1081 are staggered with the connection parts of the connecting rod 106 and the auxiliary disk 108; a spring 204 ball 109 is arranged in the mounting groove 1081, and the spring 204 ball 109 is used for enabling the auxiliary disk 108 to move smoothly; the auxiliary disk 108 is used for connecting the connecting rod 106, and at the same time, when the piston rod 102 is displaced, it can slide smoothly on the outer peripheral surface of the cylinder block 101. The arrangement of the mounting grooves 1081 on the auxiliary disk 108 and the spring 204 ball 109 in the mounting groove 1081 enable the auxiliary disk 108 to move smoothly on the outer peripheral surface of the cylinder block 101.

[0047] Working principle: Since the cleaning of the hydraulic cylinder in the prior art cannot be carried out to clean the piston rod 102 when the piston rod 102 retracts, and to timely remove the impurities or metal debris separated from the piston rod 102 after cleaning to avoid scratching the piston rod 102 when the piston rod 102 retracts. In view of the above, in an embodiment of the present invention, a cleaning module is preferentially provided to implement the cleaning of the piston rod 102. Specifically, by using the scraper 2024 in the cleaning unit, when the piston rod 102 retracts, the oil stains on the surface of the piston rod 102 and impurities such as metal debris remaining in the oil stains can be scraped off, so that the metal debris can be separated from the piston rod 102, thereby ensuring that as few impurities as possible are brought into the cylinder block 101 when the piston rod 102 retracts. In addition, the dust-proof gasket inside the cylinder plug 201 is used to further clean the remaining oil stains on the surface of the piston rod 102, ensuring that the impurities and metal debris stained on the surface of the piston rod 102 are not brought into the cylinder block 101 during the reciprocating telescopic movement of the piston rod 102; during the reciprocating telescopic movement of the piston rod 102, the movable block 2023 on the bearing tray 202 can be driven, and based on the movement of the movable block 2023, the scraper 2024 can be pressed against the piston rod 102. When the scraper 2024 approaches and presses against the surface of the piston rod 102, due to the retraction of the piston rod 102, a relative movement is generated with the scraper 2024, realizing the cleaning of the impurities on the surface of the piston rod 102; in addition, three scrapers 2024 are provided in an embodiment of the present invention, and the three scrapers 2024 can cover the entire circumferential surface of the piston rod 102, thereby realizing the cleaning of the surface of the piston rod 102. In addition, other numbers of scrapers 2024 can also be provided to achieve the cleaning of the surface of the piston rod 102; the surface of the piston rod 102 is cleaned synchronously when the piston rod 102 retracts, and no external power drive is used. Since the use environment of the hydraulic cylinder is generally outdoors, it is not suitable to set an external storage battery. On the one hand, it does not meet the specifications, and on the other hand, it is easy to be damaged. In an embodiment of the present invention, in order to clean the surface of the piston rod 102 when the piston rod 102 retracts, through the fixed disk 105 fixed to the end of the piston rod 102 and the connecting rod 106 connected to the fixed disk 105, when the piston rod 102 retracts, the connecting rod 106 will be driven to move together. The displacement of the connecting rod 106 will drive the wing plate 107 to move accordingly. During the movement of the wing plate 107, it will squeeze the movable block 2023 and drive the movable block 2023 to squeeze the scraper 2024, so that the scraper 2024 can scrape off the impurities on the surface of the piston rod 102. Among them, the auxiliary disk 108 is used to connect the connecting rod 106, and the auxiliary disk 108 slides on the outer circumferential surface of the cylinder block 101. In addition, both the fixed disk 105 and the auxiliary disk 108 are allowed to be disassembled (not shown), which is convenient for the improvement of the existing hydraulic cylinder;To facilitate the displacement of the fin plate 107 along with the connecting rod 106 and the piston rod 102, a groove for the fin plate 107 to slide needs to be opened on the conventional cylinder block 101. In an embodiment of the present invention, since the cylinder plug 201 and the cleaning unit are both components detachably installed on the existing hydraulic cylinder, therefore, to facilitate the displacement of the fin plate 107, a first relief groove 2011 and a second relief groove 2021 need to be opened on the cylinder plug 201 and the bearing tray 202 respectively, so as not to obstruct the fin plate 107 when the fin plate 107 displaces along with the piston rod 102. Among them, an infrared sensor can be arranged in the groove opened on the cylinder block 101 for the fin plate 107 to slide, so as to monitor the distance between the fin plate 107 and the bottom of the groove. By comparing the values monitored by the infrared sensors at the bottoms of multiple grooves, it can be determined whether multiple connecting rods 106 and fin plates 107 are eccentric, and then a judgment on whether the piston rod 102 is eccentric can be obtained. It should be noted that when impurities or metal chips enter the cylinder block 101, it will cause eccentric wear of the guide sleeve, thus causing the piston rod 102 to be eccentric. If not controlled and maintained, it will reduce the service life of the hydraulic cylinder. Based on the above, through the numerical judgment and analysis monitored by the infrared sensor at the bottom of the groove, it can be analyzed whether the piston rod 102 is eccentric, and a maintenance period can be set to ensure the normal use of the hydraulic cylinder.;

[0048] To prevent the bearing tray 202 from sliding randomly, the bearing tray 202 and the cylinder plug 201 are movably connected by a spring 204. In an embodiment of the present invention, the spring 204 between the bearing tray 202 and the cylinder plug 201 can provide a certain elastic potential energy for the bearing tray 202 in addition to connecting the bearing tray 202 and the cylinder plug 201. It should be noted that when the movable block 2023 is not stressed, that is, when the spring 204 is not stressed, there is a large gap between the bearing tray 202 and the cylinder plug 201, and the lever 2012 on the circumferential surface of the cylinder plug 201 is also at the end of the chute 2025 at the end of the bearing tray 202. When the movable block 2023 is stressed, that is, when the spring 204 is stressed, the distance between the bearing tray 202 and the cylinder plug 201 gradually decreases, and the lever 2012 on the circumferential surface of the cylinder plug 201 also slides in the chute 2025 on the bearing tray 202. Specifically, the lever 2012 slides from the end of the chute 2025 to the head of the chute 2025. When the spring 204 is stressed, the distance between the bearing tray 202 and the cylinder plug 201 gradually decreases, and the lever 2012 on the circumferential surface of the cylinder plug 201 also slides in the chute 2025 on the bearing tray 202. Specifically, the lever 2012 slides from the end of the chute 2025 to the head of the chute 2025. And because the chute 2025 is an L-shaped structure, when the lever 2012 slides from the end of the chute 2025 to the head of the chute 2025, the bearing tray 202 will rotate at a certain angle relative to the cylinder plug 201. Based on the rotation of the bearing tray 202, the impurities stored between the bearing tray 202 and the tray cover 203 can be thrown out, avoiding the accumulation of impurities inside the bearing tray 202 and the tray cover 203 and causing the problem of scratching the surface of the piston rod 102; when the spring 204 is stressed and the distance between the bearing tray 202 and the cylinder plug 201 gradually decreases, since the lever 2012 slides in the chute 2025, the bearing tray 202 will rotate at a certain angle and rely on the slag discharge groove 2022 to throw out the stored impurities into the bearing tray 202, avoiding the accumulation of impurities or metal debris between the bearing tray 202 and the tray cover 203. During the reciprocating telescopic movement of the piston rod 102, it contacts the circumferential surface of the piston rod 102, scratches the circumferential surface of the piston rod 102, and even wears the guide sleeve, causing the problem that one side of the guide sleeve is excessively worn and the piston rod 102 is eccentric.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An engineering hydraulic cylinder with a self-cleaning device, characterized in that: It comprises a hydraulic cylinder consisting of a cylinder body (101), a cylinder cover (103), a cylinder head (104) and a piston rod (102), and A cleaning module mounted on the cylinder head (104); The cleaning module comprises a cylinder plug (201) and a cleaning unit; the cylinder plug (201) is fixedly connected to the cylinder head (104) via a flange, and the cleaning unit is movably connected to the cylinder plug (201); The piston rod (102) passes through the cleaning module, and the piston rod (102) passes through the cylinder plug (201) and the cleaning unit in sequence; A scraper (2024) is provided in the cleaning unit, and the scraper (2024) is used to scrape off impurities on the surface of the piston rod (102).

2. The engineering hydraulic cylinder with a self-cleaning device according to claim 1, characterized in that: The cleaning unit further comprises a tray cover (203) and a tray support (202); the tray support (202) is movably connected to the cylinder plug (201); the scraper (2024) is hinged on the tray support (202); the tray cover (203) is fixedly connected to the tray support (202) via screws, and the piston rod (102) passes through the tray cover (203).

3. The engineering hydraulic cylinder with a self-cleaning device according to claim 2, characterized in that: The support tray (202) is slidably connected to a plurality of movable blocks (2023), and the displacement tracks of the plurality of movable blocks (2023) are all located on the line connecting the movable blocks (2023) and the center of the support tray (202); the movable blocks (2023) are used to drive the scraper (2024) to be close to the piston rod (102).

4. The engineering hydraulic cylinder with a self-cleaning device according to claim 3, characterized in that: The end of the piston rod (102) is fixedly connected to a fixed disk (105), and the outer ring of the fixed disk (105) is fixedly connected to a plurality of connecting rods (106); one end of the connecting rod (106) is fixedly connected to the fixed disk (105), and the other end is fixedly connected to an auxiliary disk (108); the auxiliary disk (108) is slidably connected to the outer surface of the cylinder body (101); A fin plate (107) is fixedly connected to the connecting rod (106), and the fin plate (107) is used to squeeze the movable block (2023).

5. The engineering hydraulic cylinder with a self-cleaning device according to claim 4, characterized in that: The cylinder plug (201) is provided with a first clearance groove (2011) corresponding to the fin plate (107), and the support plate (202) is provided with a second clearance groove (2021) corresponding to the fin plate (107); the fin plate (107) and the connecting rod (106) are slidably connected in the first clearance groove (2011) and the second clearance groove (2021) following the telescopic movement of the piston rod (102).

6. The engineering hydraulic cylinder with a self-cleaning device according to claim 5, characterized in that: A plurality of slide grooves (2025) are provided on one end of the support tray (202) facing the cylinder plug (201), and a plurality of levers (2012) are fixedly connected to one end of the cylinder plug (201) corresponding to the support tray (202); the levers (2012) are slidably connected in the slide grooves (2025); a spring (204) is provided between the support tray (202) and the cylinder plug (201), and the support tray (202) is movably connected to the cylinder plug (201) via the spring (204).

7. The engineering hydraulic cylinder with a self-cleaning device according to claim 6, characterized in that: The slide groove (2025) is an L-shaped structure. When the spring (204) is not subjected to force, the lever (2012) is located at the rear end of the slide groove (2025). When the spring (204) is subjected to force, the lever (2012) slides from the rear end of the slide groove (2025) to the front end of the slide groove (2025).

8. The engineering hydraulic cylinder with a self-cleaning device according to claim 7, characterized in that: A slag unloading groove (2022) is provided on the support tray (202) adjacent to the movable block (2023), and the slag unloading groove (2022) is used to carry impurities. When the lever (2012) is reset from the head end of the slide groove (2025) to the tail end of the slide groove (2025), the slag unloading groove (2022) rotates with the support tray (202) to unload slag.

9. The engineering hydraulic cylinder with a self-cleaning device according to claim 8, characterized in that: The fin plate (107) is a trapezoidal structure, and the fin plate (107) is fixedly connected to the middle part of the connecting rod (106).

10. The engineering hydraulic cylinder with a self-cleaning device according to claim 9, characterized in that: A plurality of mounting grooves (1081) are equidistantly arranged on the auxiliary plate (108), and the mounting grooves (1081) are staggeredly arranged at the connection between the connecting rod (106) and the auxiliary plate (108); a spring (204) and a ball (109) are arranged in the mounting groove (1081), and the spring (204) and the ball (109) are used to allow the auxiliary plate (108) to move smoothly.

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