Servo hydraulic cylinder with lubricating oil return function

Abstract

The invention discloses a servo hydraulic cylinder with lubrication oil return, and belongs to the field of servo hydraulic cylinders, the servo hydraulic cylinder comprises a hydraulic cylinder, a piston rod is assembled on the front side of the hydraulic cylinder, an oil storage bin is assembled on the front side of the inner wall of the hydraulic cylinder, an oil pump is assembled on the front side of the inner wall of the hydraulic cylinder, and a first connecting pipe is assembled on the right side of the oil pump; a second connecting pipe is assembled at the bottom of the oil pump, and a third connecting pipe is assembled at the bottom of the oil pump; a lubricating oil groove is formed in the front face of the inner wall of the hydraulic cylinder, a containing groove is formed in the bottom of the lubricating oil groove, a blocking plate is assembled on the front face of the inner wall of the lubricating oil groove, and a connecting sleeve is assembled at the bottom of the blocking plate. Lubricating oil is sucked from the oil storage bin through the first connecting pipe by the oil pump, fed into the lubricating oil groove through the third connecting pipe and filtered through the chipping box, so that effective circulation and recycling of the lubricating oil are achieved, it is guaranteed that chippings in the lubricating oil can be effectively filtered, and mechanical parts are prevented from being abraded and damaged.

Description

Technical Field

[0001] The present application relates to the field of servo hydraulic cylinders, and in particular to a servo hydraulic cylinder with lubrication oil return. Background Art

[0002] In recent years, many hot rolling mill roughing mill press-down systems designed and put into production are almost all equipped with servo hydraulic cylinders. Thrust bearings and spherical pads are provided between the servo hydraulic cylinder and the press-down screw; the thrust bearings and spherical pads are installed in the piston rod. The press-down screw cooperates with the nut fixed on the frame. The press-down screw is driven by the reducer to rotate, so as to move the rollers of the rolling mill up and down, adjust the distance between the two rollers, and adjust the working position of the rollers. When the press-down screw and the nut rotate together, a great friction force will be generated, so that a large amount of wear debris will be generated during the friction rotation of the press-down screw and the nut. In order to ensure the working accuracy and reduce the wear debris, the traditional practice is to add dry oil (grease) between the press-down screw and the nut.

[0003] Although the lubricating oil can be returned in the prior art, debris is generated during use of the piston rod, resulting in the debris being returned to the oil storage tank when the oil is returned. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a servo hydraulic cylinder with lubrication oil return, which solves the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present application provides a servo hydraulic cylinder with lubrication oil return, comprising a hydraulic cylinder, a piston rod is mounted on the front of the hydraulic cylinder, an oil storage tank is mounted on the front of the inner wall of the hydraulic cylinder, an oil pump is mounted on the front of the inner wall of the hydraulic cylinder, a first connecting pipe is mounted on the right side of the oil pump, a second connecting pipe is mounted on the bottom of the oil pump, and a third connecting pipe is mounted on the bottom of the oil pump;

[0006] A lubricating oil groove is provided on the front side of the inner wall of the hydraulic cylinder, a accommodating groove is provided at the bottom of the lubricating oil groove, a blocking plate is installed on the front side of the inner wall of the lubricating oil groove, a connecting sleeve is installed at the bottom of the blocking plate, a connecting box is fixedly connected to the bottom of the connecting sleeve, a box cover is hinged at the bottom of the connecting sleeve, a spring is fixedly connected to the top of the box cover, a gear ring is fixedly connected to the bottom of the box cover, a first rotating rod is rotatably connected to the front side of the connecting box through a bearing, a transmission assembly is installed on the outer wall of the first rotating rod, a first elastic telescopic rod is fixedly connected to the bottom of the transmission assembly, a debris box is provided inside the connecting box, a collecting device for collecting debris is installed on the top of the hydraulic cylinder, and a spraying device for cleaning debris is installed on the top of the hydraulic cylinder.

[0007] Preferably, the transmission assembly includes a circular gear, the circular gear is fixedly sleeved with an outer wall of a first rotating rod, a connecting plate is fixedly connected to the left side of the inner wall of the connecting box, the front side of the connecting plate is rotatably connected to the second rotating rod via a bearing, the back side of the connecting plate is rotatably connected to a sleeve via a bearing, a pulley is wound around the outer wall of the first rotating rod, and the front side of the pulley is rotatably connected to the back side of the sleeve via a bearing.

[0008] Preferably, a ratchet is fixedly connected to the outer wall of the second rotating rod, and a pawl is hingedly connected to the inner wall of the pulley.

[0009] Preferably, a semi-bevel gear is fixedly connected to the front side of the second rotating rod, the top of the connecting plate is rotatably connected to the third rotating rod via a bearing, the outer wall of the third rotating rod is fixedly sleeved with a first bevel gear, and the top of the third rotating rod is fixedly connected to the second bevel gear.

[0010] Preferably, the gear ring and the circular gear are meshed with each other, and oil leakage holes are provided at the top and bottom of the debris box.

[0011] Preferably, the collecting device comprises a second elastic telescopic rod, a bottom of the second elastic telescopic rod is provided with an inclined surface, a side of the connection box is fixedly connected with a slide rail, and the debris box slides on the top of the slide rail.

[0012] Preferably, a revolving door is hingedly connected to the top of the debris box via a hinged rod, a torsion spring is mounted on the outer wall of the hinged rod, and a pull rod is fixedly connected to the front of the debris box.

[0013] Preferably, the spraying device comprises a conical block, an inner wall of the conical block is provided with a curved groove, and an oil leakage groove is provided at the bottom of the curved groove.

[0014] The benefits of this application are:

[0015] 1. The present application uses an oil pump to draw lubricating oil from an oil storage tank through a first connecting pipe, and sends the lubricating oil into a lubricating oil tank through a third connecting pipe, and filters the lubricating oil through a debris box, thereby achieving effective circulation and reuse of the lubricating oil, while ensuring that debris in the lubricating oil can be effectively filtered to avoid wear and damage to mechanical parts.

[0016] 2. In the present application, when the first elastic telescopic rod drives the second elastic telescopic rod to rotate, the second elastic telescopic rod rotates to the top of the revolving door, squeezes the revolving door, and makes it rotate clockwise. The debris box is taken out from the slide rail through the pull rod, and the debris is collected and processed. Afterwards, the first elastic telescopic rod is reset, and drives the second elastic telescopic rod to reset, realizing the automatic collection and cleaning of debris, ensuring the long-term normal operation of the equipment, and the equipment performance will not be affected by the accumulation of debris.

[0017] 3. The spraying effect of the lubricating oil of the present application effectively mixes the debris with the lubricating oil and carries it to the bottom of the inner wall of the debris box by gravity or flow, thereby preventing the debris from accumulating inside the system and effectively draining the excess lubricating oil through the oil drain groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the partial structure of the present invention Figure 1 ;

[0021] Figure 3 It is a schematic diagram of the partial structure of the present invention Figure 2 ;

[0022] Figure 4 It is a schematic diagram of the partial structure of the present invention Figure 3 ;

[0023] Figure 5 It is a schematic diagram of the partial structure of the present invention Figure 4 ;

[0024] Figure 6 This is a schematic diagram of the conical block structure of the present invention;

[0025] Figure 7 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0026] Figure 8 For the present invention Figure 5 Enlarged structural diagram at B in the middle.

[0027] In the above figure,

[0028] 1. Hydraulic cylinder; 21. Lubricating oil groove; 22. Accommodating groove; 23. Blocking plate; 24. Connecting box; 25. Connecting sleeve; 26. Box cover; 27. Spring; 28. Gear ring; 29. ​​First rotating rod; 210. Circular gear; 211. Connecting plate; 212. Second rotating rod; 213. Sleeve; 214. Pulley; 215. Semi-bevel gear; 216. Third rotating rod; 217. First bevel gear; 218. Second bevel gear Gear; 219, first elastic telescopic rod; 220, ratchet; 221, pawl; 3, collecting device; 31, second elastic telescopic rod; 32, inclined surface; 33, slide rail; 34, pull rod; 35, revolving door; 4, spraying device; 41, conical block; 42, curved groove; 43, oil leakage groove; 5, oil storage bin; 6, oil pump; 7, third connecting pipe; 8, second connecting pipe; 9, first connecting pipe; 10, debris box. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application are described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0031] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0032] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0033] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] Example 1, see Figure 1-Figure 8 The present embodiment provides a servo hydraulic cylinder with lubrication oil return, including a hydraulic cylinder 1, a piston rod is mounted on the front of the hydraulic cylinder 1, an oil storage tank 5 is mounted on the front of the inner wall of the hydraulic cylinder 1, an oil pump 6 is mounted on the front of the inner wall of the hydraulic cylinder 1, a first connecting pipe 9 is mounted on the right side of the oil pump 6, a second connecting pipe 8 is mounted on the bottom of the oil pump 6, and a third connecting pipe 7 is mounted on the bottom of the oil pump 6;

[0036] A lubricating oil groove 21 is provided on the front of the inner wall of the hydraulic cylinder 1, and a accommodating groove 22 is provided at the bottom of the lubricating oil groove 21. A blocking plate 23 is installed on the front of the inner wall of the lubricating oil groove 21, and a connecting sleeve 25 is installed at the bottom of the blocking plate 23. A connecting box 24 is fixedly connected to the bottom of the connecting sleeve 25, and a box cover 26 is hinged at the bottom of the connecting sleeve 25. A spring 27 is fixedly connected to the top of the box cover 26, and a gear ring 28 is fixedly connected to the bottom of the box cover 26. A first rotating rod 29 is rotatably connected to the front of the connecting box 24 through a bearing, and a transmission assembly is installed on the outer wall of the first rotating rod 29. A first elastic telescopic rod 219 is fixedly connected to the bottom of the transmission assembly. A debris box 10 is arranged inside the connecting box 24, a collecting device 3 for collecting debris is installed on the top of the hydraulic cylinder 1, and a spraying device 4 for cleaning debris is installed on the top of the hydraulic cylinder 1. The oil pump 6 installed on the front of the inner wall of the hydraulic cylinder 1 is connected to the oil storage tank 5 through a first connecting pipe 9, a second connecting pipe 8 and a third connecting pipe 7 to realize the circulation of lubricating oil. The lubricating oil groove 21 opened on the front of the inner wall of the hydraulic cylinder 1 has a receiving groove 22 at the bottom, the connecting sleeve 25 at the bottom of the blocking plate 23 is connected to the connecting box 24, the box cover 26 is connected to the connecting box 24 through the spring 27, and the box cover 26 has a gear ring 28 at the bottom. When the hydraulic cylinder 1 is working, the movement of the piston rod may cause debris to be generated, and these debris will enter the lubricating oil groove 21 and the receiving groove 22 area, realizing the lubrication and oil return function inside the hydraulic cylinder 1, and the lubricating oil can be circulated on the outer wall of the piston rod of the hydraulic cylinder 1 through the oil pump 6 and the lubricating oil groove 21, reducing the waste of lubricating oil. At the same time, the arrangement of the structures such as the lubricating oil groove 21, the receiving groove 22, the blocking plate 23, the connecting sleeve 25, the connecting box 24, the box cover 26, the spring 27 and the gear ring 28 provides a basis for the subsequent collection and treatment of debris, which helps to keep the inside of the hydraulic cylinder 1 clean and extend the service life of the hydraulic cylinder 1. The transmission assembly includes a circular gear 210, which is fixedly sleeved with the outer wall of the first rotating rod 29. A connecting plate 211 is fixedly connected to the left side of the inner wall of the connecting box 24. The front side of the connecting plate 211 is rotatably connected to the second rotating rod 212 through a bearing. The back side of the connecting plate 211 is rotatably connected to a sleeve 213 through a bearing. A pulley 214 is wound around the outer wall of the first rotating rod 29. The front side of the pulley 214 is rotatably connected to the back side of the sleeve 213 through a bearing, thereby realizing the lubrication and oil return function inside the hydraulic cylinder 1. Through the arrangement of the oil pump 6 and the connecting pipe, the lubricating oil can be circulated inside the hydraulic cylinder 1 to reduce the waste of the lubricating oil.At the same time, the arrangement of the lubricating oil groove 21, the receiving groove 22, the blocking plate 23, the connecting sleeve 25, the connecting box 24, the box cover 26, the spring 27 and the gear ring 28 provides a basis for the subsequent collection and treatment of debris, helps to keep the inside of the hydraulic cylinder 1 clean, and prolongs the service life of the hydraulic cylinder 1. The combination of the circular gear 210, the connecting plate 211, the second rotating rod 212, the sleeve 213 and the pulley 214 constitutes a transmission system, which can convert the rotation of the first rotating rod 29 into the rotation of the second rotating rod 212, and provides power support for the subsequent treatment of debris, so that the whole device has a higher degree of automation and runs more smoothly. The outer wall of the second rotating rod 212 is fixedly connected to a ratchet 220, and the inner wall of the pulley 214 is hinged with a pawl 221. The outer wall of the second rotating rod 212 is fixedly connected to a ratchet 220, and the inner wall of the pulley 214 is hinged with a pawl 221. When the second rotating rod 212 rotates, the ratchet 220 rotates accordingly, thereby realizing the driving of the subsequent components. The cooperation of the ratchet 220 and the pawl 221 realizes the unidirectional rotation of the second rotating rod 212. This transmission method can accurately control the movement of the subsequent components, making the debris processing process more orderly and efficient. The front of the second rotating rod 212 is fixedly connected with a semi-bevel gear 215, and the top of the connecting plate 211 is rotatably connected with a third rotating rod 216 through a bearing. The outer wall of the third rotating rod 216 is fixedly sleeved with a first bevel gear 217, and the top of the third rotating rod 216 is fixedly connected with a second bevel gear 218. The front of the second rotating rod 212 is fixedly connected with a semi-bevel gear 215, and the top of the connecting plate 211 is rotatably connected with the third rotating rod 216 through a bearing. The outer wall of the third rotating rod 216 is fixedly sleeved with a first bevel gear 217, and the top is fixedly connected with a second bevel gear 218. When the second rotating rod 212 rotates, the semi-bevel gear 215 rotates accordingly, and the direction and speed of rotation can be changed by cooperating with the first bevel gear 217 and the second bevel gear 218, so as to transfer power to other parts. The front of the second rotating rod 212 is fixedly connected with the semi-bevel gear 215, and the top of the connecting plate 211 is rotatably connected with the third rotating rod 216 through a bearing. The outer wall of the third rotating rod 216 is fixedly sleeved with the first bevel gear 217, and the top is fixedly connected with the second bevel gear 218. When the second rotating rod 212 rotates, the semi-bevel gear 215 rotates accordingly, and the direction and speed of rotation can be changed by cooperating with the first bevel gear 217 and the second bevel gear 218, so as to transfer power to other parts. The gear ring 28 is meshed with the circular gear 210, and the top and bottom of the debris box 10 are provided with oil leakage holes. The meshing transmission of the gear ring 28 and the circular gear 210 causes the first elastic telescopic rod 219 to rotate, thereby realizing the collection of debris. The provision of the oil leakage hole helps the lubricating oil to fall into the connecting box 24 , which, on the one hand, facilitates the centralized processing of debris, and on the other hand, ensures the cleanliness of the lubricating oil, improves the lubrication effect, and reduces the impact on the performance of the hydraulic cylinder 1 .

[0037] When the above device is used, the oil pump 6 draws lubricating oil from the oil storage tank 5 through the first connecting pipe 9, and outputs it to the lubricating oil tank 21 through the third connecting pipe 7. The lubricating oil goes around the piston rod for one circle, and squeezes the box cover 26 through the lubricating oil inside the connecting sleeve 25. The box cover 26 rotates counterclockwise with the hinge point as the center of the circle, and the spring 27 is stretched. The lubricating oil enters the connection box 24, and the box cover 26 drives the gear ring 28 to move to the left, and the gear ring 28 drives the circular gear 210 to rotate, and the circular gear 21 0 drives the first rotating rod 29 to rotate, the first rotating rod 29 drives the pulley 214 to rotate, the pulley 214 drives the bottom pulley 214 to rotate clockwise, the pulley 214 drives the ratchet 221 to slide on the outer wall of the ratchet 220, the lubricating oil passes through the debris box 10, the debris in the lubricating oil is filtered through the oil leakage hole, the filtered lubricating oil is absorbed through the second connecting pipe 8 at the bottom of the connecting box 24, and re-discharged into the oil storage tank 5, after a round of lubricating oil lubricates the piston rod The box cover 26 is reset by the spring 27. After the box cover 26 is reset, it drives the gear ring 28 to drive the circular gear 210 to rotate counterclockwise. The circular gear 210 drives the first rotating rod 29 to rotate. The first rotating rod 29 drives the pulley 214 to rotate. The pulley 214 drives the bottom pulley 214 to rotate. The pulley 214 drives the pawl 221. The pawl 221 drives the ratchet 220 to rotate. The ratchet 220 drives the second rotating rod 212 to rotate. The second rotating rod 212 drives the semi-bevel gear 215 to rotate. The gear 215 drives the first bevel gear 217 to rotate, the first bevel gear 217 drives the third rotating rod 216 to rotate, the third rotating rod 216 drives the first elastic telescopic rod 219 to rotate, and the debris on the top of the debris box 10 is gathered. When the semi-bevel gear 215 continues to rotate and no longer meshes with the first bevel gear 217, it will start to mesh with the second bevel gear 218, the second bevel gear 218 drives the third rotating rod 216 to rotate, and the third rotating rod 216 drives the first elastic telescopic rod 219 to reset.

[0038] Example 2, see Figure 1-Figure 8On the basis of the first embodiment, the collecting device 3 includes a second elastic telescopic rod 31, the bottom of the second elastic telescopic rod 31 is provided with an inclined surface 32, the side of the connecting box 24 is fixedly connected with a slide rail 33, and the debris box 10 slides on the top of the slide rail 33. The collecting device 3 includes a second elastic telescopic rod 31, the bottom of which is provided with an inclined surface 32. The side of the connecting box 24 is fixedly connected with a slide rail 33, and the debris box 10 slides on the top of the slide rail 33. When the debris box 10 moves to the top of the slide rail 33 driven by the ring gear 28 and the circular gear 210, the inclined surface 32 of the second elastic telescopic rod 31 contacts the debris box 10, and under the action of the elastic force, the debris in the debris box 10 is pushed to the collection area, and the revolving door 35 is squeezed to open by the setting of the second elastic telescopic rod 31 and the inclined surface 32. A revolving door 35 is hinged on the top of the debris box 10 through a hinge rod, a torsion spring is installed on the outer wall of the hinge rod, a pull rod 34 is fixedly connected to the front of the debris box 10, and the elastic coefficient of the second elastic telescopic rod 31 is greater than the elastic coefficient of the torsion spring.

[0039] When the above-mentioned device is used, when the first elastic telescopic rod 219 drives the second elastic telescopic rod 31 to rotate, when the second elastic telescopic rod 31 rotates to the top of the revolving door 35, the second elastic telescopic rod 31 squeezes the revolving door 35 to rotate, and the revolving door 35 rotates clockwise with the hinge point as the center of the circle. Since the second elastic telescopic rod 31 contacts the revolving door 35 before the first elastic telescopic rod 219, after the revolving door 35 is opened, the debris is pushed into the debris box 10 by the first elastic telescopic rod 219, and the debris box 10 is taken out from the slide rail 33 by the pull rod 34. When the first elastic telescopic rod 219 is reset, it drives the second elastic telescopic rod 31 to reset, and squeezes the second elastic telescopic rod 31 by the edge of the revolving door 35, so that the second elastic telescopic rod 31 shrinks and resets, and the debris is processed.

[0040] Example 3, see Figure 1-Figure 8 On the basis of the first embodiment, the spraying device 4 includes a conical block 41, the inner wall of the conical block 41 is provided with a curved groove 42, and the bottom of the curved groove 42 is provided with an oil leakage groove 43. The setting of the conical block 41, the curved groove 42 and the oil leakage groove 43 constitutes a spraying system, which can spray the lubricating oil evenly onto the surface of the conical block 41, clean the surface, remove residual debris and impurities, prevent debris from adhering to the inside of the debris box 10, and also create good conditions for the next round of lubrication and debris collection.

[0041] When the above-mentioned device is used, when the lubricating oil passes through the debris box 10, the lubricating oil will enter from the large diameter hole of the curved groove 42 and be discharged from the small diameter hole, and the lubricating oil will be sprayed on the inclined part of the conical block 41, so that the lubricating oil and debris slide to the bottom of the inner wall of the debris box 10, and at the same time, the lubricating oil accumulated at the bottom of the curved groove 42 will be discharged through the oil leakage groove 43.

[0042] When the above-mentioned device is used in a specific manner, the above description is only a preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacement or change, which should be covered by the protection scope of the present invention.

Claims

1. A servo hydraulic cylinder with lubrication oil return, comprising a hydraulic cylinder (1), a piston rod is mounted on the front of the hydraulic cylinder (1), an oil storage tank (5) is mounted on the front of the inner wall of the hydraulic cylinder (1), an oil pump (6) is mounted on the front of the inner wall of the hydraulic cylinder (1), a first connecting pipe (9) is mounted on the right side of the oil pump (6), a second connecting pipe (8) is mounted on the bottom of the oil pump (6), and a third connecting pipe (7) is mounted on the bottom of the oil pump (6); It is characterized in that The front face of the inner wall of the hydraulic cylinder (1) is provided with a lubricating oil groove (21), the bottom of the lubricating oil groove (21) is provided with a containing groove (22), the front face of the inner wall of the lubricating oil groove (21) is provided with a blocking plate (23), the bottom of the blocking plate (23) is provided with a connecting sleeve (25), the bottom of the connecting sleeve (25) is fixedly connected to a connecting box (24), the bottom of the connecting sleeve (25) is hinged with a box cover (26), the top of the box cover (26) is fixedly connected to a spring (27), and the box cover (26) A gear ring (28) is fixedly connected to the bottom, a first rotating rod (29) is rotatably connected to the front of the connection box (24) via a bearing, a transmission assembly is mounted on the outer wall of the first rotating rod (29), a first elastic telescopic rod (219) is fixedly connected to the bottom of the transmission assembly, a debris box (10) is arranged inside the connection box (24), a collecting device (3) for collecting debris is mounted on the top of the hydraulic cylinder (1), and a spraying device (4) for cleaning debris is mounted on the top of the hydraulic cylinder (1).

2. A servo hydraulic cylinder with lubrication oil return according to claim 1, characterized in that: The transmission assembly comprises a circular gear (210), the circular gear (210) is fixedly sleeved on the outer wall of a first rotating rod (29), a connecting plate (211) is fixedly connected to the left side of the inner wall of the connecting box (24), the front side of the connecting plate (211) is rotatably connected to the second rotating rod (212) via a bearing, the back side of the connecting plate (211) is rotatably connected to a sleeve (213) via a bearing, a pulley (214) is wound around the outer wall of the first rotating rod (29), and the front side of the pulley (214) is rotatably connected to the back side of the sleeve (213) via a bearing.

3. A servo hydraulic cylinder with lubrication oil return according to claim 2, characterized in that: A ratchet (220) is fixedly connected to the outer wall of the second rotating rod (212), and a ratchet pawl (221) is hingedly connected to the inner wall of the pulley (214).

4. A servo hydraulic cylinder with lubrication oil return according to claim 3, characterized in that: The front side of the second rotating rod (212) is fixedly connected to a semi-bevel gear (215); the top of the connecting plate (211) is rotatably connected to a third rotating rod (216) via a bearing; the outer wall of the third rotating rod (216) is fixedly sleeved with a first bevel gear (217); the top of the third rotating rod (216) is fixedly connected to a second bevel gear (218).

5. A servo hydraulic cylinder with lubrication oil return according to claim 4, characterized in that: The gear ring (28) and the circular gear (210) are meshed with each other, and oil leakage holes are provided at the top and bottom of the debris box (10).

6. A servo hydraulic cylinder with lubrication oil return according to claim 1, characterized in that: The collecting device (3) comprises a second elastic telescopic rod (31), the bottom of the second elastic telescopic rod (31) is provided with an inclined surface (32), the side of the connection box (24) is fixedly connected to a slide rail (33), and the debris box (10) slides on the top of the slide rail (33).

7. A servo hydraulic cylinder with lubrication oil return according to claim 6, characterized in that: The top of the debris box (10) is hinged with a rotating door (35) via a hinged rod, the outer wall of the hinged rod is equipped with a torsion spring, and the front of the debris box (10) is fixedly connected with a pull rod (34).

8. The servo hydraulic cylinder with lubrication oil return according to claim 1, characterized in that: The spraying device (4) comprises a conical block (41), the inner wall of the conical block (41) is provided with a curved groove (42), and the bottom of the curved groove (42) is provided with an oil leakage groove (43).

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