Hydraulic oil cylinder

Abstract

The utility model provides a hydraulic oil cylinder which comprises a cylinder body provided with an oil storage cavity and an oil inlet and an oil outlet which are oppositely arranged. The piston rod is provided with a piston end and a connecting end which are oppositely arranged, the piston end is provided with a piston plate, the piston plate is movably arranged in the oil storage cavity, and the connecting end is movably arranged on the outer side of the oil storage cavity; the first cleaning assembly is arranged on the side, close to the oil discharge outlet, of the piston plate and located on the inner side of the oil storage cavity, the first cleaning assembly comprises a first brush and a first driving part, and the first driving part is used for driving the first brush to move relative to the inner wall of the cylinder body; and the second cleaning assembly is arranged at the connecting end and arranged on the outer side of the oil storage cavity, the second cleaning assembly comprises a second brush and a second driving piece, and the second driving piece is used for driving the second brush to move relative to the outer wall of the piston rod. By means of the technical scheme, the problem that in the prior art, a hydraulic oil cylinder needs to be frequently shut down for maintenance to be cleaned can be solved.

Description

Technical Field

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

[0002] Currently, hydraulic cylinders are widely used in various engineering industries as a power output source. Hydraulic cylinders mainly consist of a cylinder body and a piston rod. Hydraulic oil drives the piston rod to move relative to the cylinder body to provide power output.

[0003] Traditional hydraulic cylinders achieve propulsion and retraction through the input and discharge of hydraulic oil. However, with the circulation and deterioration of the hydraulic oil, residual hydraulic oil impurities will remain in the cylinder body, affecting the cleanliness inside the hydraulic cylinder and possibly shortening the service life of the hydraulic cylinder. In addition, traditional hydraulic cylinders do not have a cleaning method for the propulsion rod. The impurities remaining on the propulsion rod may affect the normal propulsion and retraction actions of the hydraulic cylinder, seriously affecting the normal use of the hydraulic cylinder and frequently requiring shutdown for maintenance. Utility Model Content

[0004] The utility model provides a hydraulic oil cylinder to solve the problem in the prior art that the hydraulic oil cylinder needs to be frequently shut down for maintenance and cleaning.

[0005] The utility model provides a hydraulic oil cylinder, which includes: a cylinder body, having an oil storage chamber, and the cylinder body having an oil inlet and an oil discharge port which are relatively arranged; a piston rod, having a piston end and a connecting end which are relatively arranged, and the piston end is provided with a piston plate, the piston plate is movably arranged in the oil storage chamber, and the connecting end is movably arranged on the outside of the oil storage chamber; a first cleaning component is arranged on a side of the piston plate close to the oil discharge port and is located on the inner side of the oil storage chamber, the first cleaning component includes a first brush and a first driving member, the first driving member is drivingly connected to the first brush, and the first driving member is used to drive the first brush to move relative to the inner wall of the cylinder body; a second cleaning component is arranged at the connecting end and is arranged on the outside of the oil storage chamber, the second cleaning component includes a second brush and a second driving member, the second driving member is drivingly connected to the second brush, and the second driving member is used to drive the second brush to move relative to the outer wall of the piston rod.

[0006] Furthermore, the first cleaning component includes a support plate and a rotating shaft. The support plate is fixedly arranged in the oil storage chamber. The rotating shaft coincides with the axis of the cylinder body. The plane where the support plate is located is perpendicular to the axis of the cylinder body. One end of the rotating shaft is rotatably connected to the support plate, and the other end of the rotating shaft is rotatably connected to the first driving member. The first brush is arranged on the side wall of the rotating shaft, and the first driving member is used to drive the rotating shaft to rotate around the axis.

[0007] Furthermore, the support plate includes a plurality of support rods, and the plurality of support rods are arranged in a ring-shaped manner.

[0008] Furthermore, the second cleaning component includes a bearing and a mounting plate. The bearing is fixedly sleeved at the connecting end. The outer ring of the bearing is fixedly provided with a mounting plate. The mounting plate extends along the extension direction of the piston rod. A second brush is provided on the side of the mounting plate facing the piston rod. The second driving member is drivingly connected to the outer ring of the bearing to drive the second brush to rotate relative to the piston rod.

[0009] Furthermore, the second cleaning assembly also has a third brush, and the third brush is arranged on the side of the mounting plate facing the cylinder body.

[0010] Furthermore, a buffer assembly is provided between the piston rod and the cylinder body to buffer the movement of the piston rod relative to the cylinder body.

[0011] Furthermore, the buffer assembly includes multiple telescopic rods and multiple springs, and the multiple springs are arranged in a one-to-one correspondence with the multiple telescopic rods. The springs are sleeved on the telescopic rods, and there are limit plates at both ends of the telescopic rods. The two ends of the springs are respectively in contact with the two limit plates. The springs are used to provide elastic force for the two limit plates to move away from each other. The telescopic rod is arranged on the side of the piston plate facing the connecting end, and the telescopic rod extends along the axial direction of the piston rod. The multiple telescopic rods are arranged in a ring-shaped interval around the axis of the piston plate.

[0012] Furthermore, a connecting plate is provided at the connecting end, and the buffer assembly also includes multiple damping rods, which are fixedly arranged on the side of the connecting plate facing the cylinder body. The damping rods extend along the axis of the piston rod, and the multiple damping rods are arranged in a ring-shaped interval around the axis of the connecting plate.

[0013] Furthermore, a limit assembly is provided in the oil storage chamber, and the limit assembly is used to limit the displacement of the piston plate in the oil storage chamber.

[0014] Furthermore, the limit assembly includes multiple limit blocks, which are supported by elastic materials. The multiple limit blocks are arranged on the inner wall of the cylinder body in annular intervals. The multiple limit blocks arranged in annular intervals form a limit ring group. There are two limit ring groups, and the two limit ring groups are arranged on both sides of the piston plate relatively along the axis of the piston rod.

[0015] By applying the technical solution of the present invention, the oil inlet and the oil outlet are used to connect the oil storage chamber to the hydraulic system. The oil inlet and oil outlet of the oil inlet and the oil outlet can drive the movement of the piston plate in the oil storage chamber, thereby realizing the driving of the piston rod. As the hydraulic oil flows through the oil inlet and the oil outlet, impurities are easily deposited on the inner wall of the cylinder body at the oil inlet and the oil outlet. The present application sets a first brush on the side of the piston plate close to the oil outlet. The first brush can move relative to the cylinder body under the drive of the first driving member to clean the impurities deposited on the inner wall of the cylinder body, thereby ensuring the cleanliness of the interior of the cylinder body; and the present application sets a second brush on the outer wall of the piston rod. The second brush can move relative to the piston rod under the drive of the second driving member to clean the impurities deposited on the outer wall of the piston rod, thereby ensuring the smoothness of the movement of the piston rod. By setting the first cleaning component and the second cleaning component, the impact of impurities on the life of the hydraulic cylinder can be reduced, and the maintenance cost of the hydraulic cylinder can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 Shows a structural schematic diagram of the hydraulic cylinder provided by the utility model;

[0018] Figure 2 It shows a schematic diagram of the structure inside the cylinder provided by the utility model;

[0019] Figure 3 It shows a schematic structural diagram of the support plate and the cylinder body provided by the present invention;

[0020] Figure 4 Shown Figure 2 A partial enlarged view of point A in the middle.

[0021] The above drawings include the following reference numerals:

[0022] 100, cylinder body; 101, oil inlet; 102, oil outlet;

[0023] 110. Base; 120. Support column;

[0024] 200, piston rod; 210, piston plate; 220, connecting plate;

[0025] 310, first brush; 320, first driving member; 330, support plate; 331, support rod; 340, rotating shaft; 350, coupling;

[0026] 410 , second brush; 420 , second driving member; 430 , bearing; 440 , mounting plate; 450 , third brush; 510 , telescopic rod; 520 , spring; 530 , damping rod; 540 , limit block. DETAILED DESCRIPTION

[0027] 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 embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figures 1 to 3 As shown, an embodiment of the present invention provides a hydraulic cylinder, which includes a cylinder body 100, a piston rod 200, a first cleaning assembly and a second cleaning assembly. The cylinder body 100 has an oil storage chamber, and the cylinder body 100 has an oil inlet 101 and an oil outlet 102 that are relatively arranged. The piston rod 200 has a piston end and a connecting end that are relatively arranged. The piston end is provided with a piston plate 210. The piston plate 210 is movably arranged in the oil storage chamber, and the connecting end is movably arranged on the outside of the oil storage chamber. The first cleaning assembly is arranged on the side of the piston plate 210 close to the oil outlet 102 and is located on the inner side of the oil storage chamber. The first cleaning assembly includes a first brush 310 and a first driving member 320. The first driving member 320 is drivingly connected to the first brush 310. The first driving member 320 is used to drive the first brush 310 to move relative to the inner wall of the cylinder body 100. The second cleaning component is arranged at the connecting end and on the outside of the oil storage chamber. The second cleaning component includes a second brush 410 and a second driving member 420. The second driving member 420 is driven and connected to the second brush 410. The second driving member 420 is used to drive the second brush 410 to move relative to the outer wall of the piston rod 200.

[0029] Through the above setting, the oil inlet 101 and the oil outlet 102 are used to connect the oil storage chamber to the hydraulic system. The oil inlet and oil outlet 101 and the oil outlet 102 can drive the piston plate 210 to move in the oil storage chamber, thereby realizing the driving of the piston rod 200. As the hydraulic oil flows through the oil inlet 101 and the oil outlet 102, impurities are easily deposited on the inner wall of the cylinder body 100 at the oil inlet 101 and the oil outlet 102. The present application provides a first brush 310 on the side of the piston plate 210 near the oil outlet 102. The first brush 310 can move relative to the cylinder body 100 under the drive of the first driving member 320 to clean the impurities deposited on the inner wall of the cylinder body 100, thereby ensuring the cleanliness of the interior of the cylinder body 100. In addition, the present application provides a second brush 410 on the outer wall of the piston rod 200. The second brush 410 can move relative to the piston rod 200 under the drive of the second driving member 420 to clean the impurities deposited on the outer wall of the piston rod 200, thereby ensuring the smooth movement of the piston rod 200. By providing the first cleaning component and the second cleaning component, the impact of impurities on the life of the hydraulic cylinder can be reduced, and the maintenance cost of the hydraulic cylinder can be reduced.

[0030] Specific reference Figure 2 and Figure 3 As shown, the first cleaning assembly includes a support plate 330 and a rotating shaft 340. The support plate 330 is fixedly disposed within the oil storage chamber. The rotating shaft 340 coincides with the axis of the cylinder body 100, and the plane on which the support plate 330 is located is perpendicular to the axis of the cylinder body 100. One end of the rotating shaft 340 is rotatably connected to the support plate 330, and the other end of the rotating shaft 340 is drivingly connected to the first driving member 320. The first brush 310 is disposed on the sidewall of the rotating shaft 340, and the first driving member 320 is used to drive the rotating shaft 340 to rotate about the axis. With this arrangement, the first brush 310 can, driven by the first driving member 320, clean the inner wall of the cylinder body 100 in a circular manner, thereby improving the cleaning effect of the first brush 310 and brushing off impurities on the inner wall of the cylinder body 100. The impurities will enter the hydraulic pump station with the circulation of hydraulic oil and be discharged from the hydraulic system under filtration by the hydraulic pump station.

[0031] Furthermore, a plurality of first brushes 310 may be provided, and the plurality of first brushes 310 are arranged on the side wall of the rotating shaft 340 at annular intervals.

[0032] Specifically, the first driving member 320 can be a driving motor, the output end of the driving motor is driven and connected to the rotating shaft 340 through a coupling 350, and the driving motor is arranged on the base 110 of the hydraulic cylinder. A plurality of support columns 120 are provided on the base 110, and the support columns 120 support the cylinder body 100 to provide installation space for the driving motor.

[0033] In the embodiment of the present application, the support plate 330 includes a plurality of support rods 331, the ends of which are fixedly connected to the cylinder body 100. The plurality of support rods 331 are arranged in an annular pattern. With this arrangement, the spaces between adjacent support rods 331 form a flow channel for hydraulic oil, enabling the hydraulic oil to drive the piston plate 210 to move.

[0034] In other feasible embodiments of the present application, the support plate 330 may also be provided with structures such as flow holes to reduce the impact of the support plate 330 on the flow of hydraulic oil.

[0035] refer to Figure 4 As shown, the second cleaning assembly includes a bearing 430 and a mounting plate 440. The bearing 430 is fixedly mounted on the connecting end. The outer ring of the bearing 430 is fixedly mounted with the mounting plate 440. The mounting plate 440 extends along the extension direction of the piston rod 200. A second brush 410 is provided on the side of the mounting plate 440 facing the piston rod 200. The second driving member 420 is drivingly connected to the outer ring of the bearing 430 to drive the second brush 410 to rotate relative to the piston rod 200. When the piston rod 200 is extended for a long time, dust will accumulate in the hydraulic oil attached to the piston rod 200, affecting the smooth operation of the piston rod 200. With the above arrangement, the rotation of the second brush 410 can clear the dust on the surface of the piston rod 200, ensuring the effective operation of the piston rod 200.

[0036] Specifically, the piston rod 200 has a retracted limit position and an extended limit position relative to the cylinder body. The bearing 430 is sleeved on the connecting end of the piston rod 200. When the piston rod 200 is in the process of retraction, the impurities on the outer wall of the piston rod 200 will be cleaned under the obstruction of the sealing ring. The second cleaning component provided in this application cleans the part of the piston rod 200 that cannot be retracted into the cylinder body 100 when the piston rod 200 is in the retracted limit position, so as to ensure that the piston rod 200 can remain smooth when switching between the fully retracted and extended states.

[0037] Furthermore, the second cleaning component also has a third brush 450, which is arranged on the side of the mounting plate 440 facing the cylinder body 100. In this way, the third brush 450 can specifically clean the fitting part between the piston rod 200 and the sealing ring to improve the cleaning effect of the second cleaning component.

[0038] Furthermore, a plurality of mounting plates 440 may be provided, and the plurality of mounting plates 440 are arranged on the outer ring of the bearing 430 at annular intervals.

[0039] Specifically, the outer ring of the bearing 430 may be sleeved with a gear ring, and the output end of the second driving member 420 is drivingly connected to the gear ring to drive the outer ring of the bearing 430 to rotate.

[0040] In the present application, a buffer assembly is provided between the piston rod 200 and the cylinder body 100 to cushion the movement of the piston rod 200 relative to the cylinder body 100. This arrangement can reduce the impact on the piston rod 200 during advancement and retraction, reduce damage to the hydraulic cylinder, and further increase the service life of the hydraulic cylinder.

[0041] Specifically, the buffer assembly includes a plurality of telescopic rods 510 and a plurality of springs 520. The plurality of springs 520 are arranged in a one-to-one correspondence with the plurality of telescopic rods 510. The springs 520 are sleeved on the telescopic rods 510. The telescopic rods 510 have limit plates at both ends. The ends of the springs 520 respectively abut against the two limit plates. One limit plate is fixedly connected to the piston plate 210, and the other limit plate abuts against the inner wall of the end of the cylinder body 100. The springs 520 are used to provide an elastic force to move the two limit plates away from each other. The telescopic rods 510 are arranged on the side of the piston plate 210 facing the connection end. The telescopic rods 510 extend along the axis of the piston rod 200. The plurality of telescopic rods 510 are arranged in an annular manner around the axis of the piston plate 210. Through the above arrangement, the plurality of telescopic rods 510, in conjunction with the springs 520, can provide a buffer for the extension movement of the piston rod 200, preventing damage to the connection device that may be caused by sudden movement of the piston rod 200.

[0042] Furthermore, a connecting plate 220 is provided at the connecting end, and the buffer assembly also includes multiple damping rods 530. The damping rods 530 are fixedly mounted on the side of the connecting plate 220 facing the cylinder body 100. The damping rods 530 extend along the axis of the piston rod 200. The multiple damping rods 530 are arranged in an annular pattern around the axis of the connecting plate 220. Through this arrangement, the multiple damping rods 530 can buffer the retraction of the piston rod 200, decelerate and assist in the retraction of the piston rod 200, and reduce damage to the hydraulic cylinder caused by the piston rod 200.

[0043] Specifically, the second driving member 420 is fixedly disposed on the connecting plate 220 .

[0044] In the present application, a limit assembly is provided in the oil storage chamber to limit the displacement of the piston plate 210 in the oil storage chamber. Through the above arrangement, the limit assembly can prevent excessive displacement of the piston rod 200, thereby ensuring that the normal movement of the piston rod 200 does not damage the first cleaning assembly and the second cleaning assembly.

[0045] Specifically, the limiting assembly includes a plurality of limiting blocks 540, which are supported by an elastic material and arranged in an annular pattern on the inner wall of the cylinder body 100. The plurality of annularly spaced limiting blocks 540 form a limiting ring set, of which two limiting ring sets are provided, and the two limiting ring sets are arranged on opposite sides of the piston plate 210 along the axis of the piston rod 200. With this arrangement, when the piston plate 210 moves to abut against the limiting ring set, the limiting ring set can be used to limit the piston plate 210. Specifically, the limiting blocks 540 can be made of an elastic material.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0048] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A hydraulic cylinder, characterized in that: The hydraulic cylinder comprises: The cylinder body (100) has an oil storage cavity, and the cylinder body (100) has an oil inlet (101) and an oil outlet (102) arranged opposite to each other; The piston rod (200) has a piston end and a connecting end that are arranged opposite to each other, the piston end is provided with a piston plate (210), the piston plate (210) is movably arranged in the oil storage cavity, and the connecting end is movably arranged outside the oil storage cavity; A first cleaning assembly is provided on a side of the piston plate (210) close to the oil discharge port (102) and located inside the oil storage chamber, the first cleaning assembly comprising a first brush (310) and a first driving member (320), the first driving member (320) being drivingly connected to the first brush (310), and the first driving member (320) being used to drive the first brush (310) to move relative to the inner wall of the cylinder body (100); A second cleaning assembly is arranged at the connecting end and outside the oil storage chamber. The second cleaning assembly includes a second brush (410) and a second driving member (420). The second driving member (420) is drivingly connected to the second brush (410). The second driving member (420) is used to drive the second brush (410) to move relative to the outer wall of the piston rod (200).

2. The hydraulic cylinder according to claim 1, characterized in that: The first cleaning assembly comprises a support plate (330) and a rotating shaft (340), wherein the support plate (330) is fixedly arranged in the oil storage chamber, the rotating shaft (340) coincides with the axis of the cylinder body (100), and the plane where the support plate (330) is located is perpendicular to the axis of the cylinder body (100), one end of the rotating shaft (340) is rotatably connected to the support plate (330), and the other end of the rotating shaft (340) is drivably connected to the first driving member (320), the first brush (310) is arranged on the side wall of the rotating shaft (340), and the first driving member (320) is used to drive the rotating shaft (340) to rotate around the axis.

3. The hydraulic cylinder according to claim 2, characterized in that: The support plate (330) includes a plurality of support rods (331), and the plurality of support rods (331) are arranged in an annular manner.

4. The hydraulic cylinder according to claim 1, characterized in that: The second cleaning component includes a bearing (430) and a mounting plate (440), wherein the bearing (430) is fixedly sleeved on the connecting end, and the outer ring of the bearing (430) is fixedly provided with the mounting plate (440), and the mounting plate (440) extends along the extension direction of the piston rod (200), and the second brush (410) is provided on the side of the mounting plate (440) facing the piston rod (200), and the second driving member (420) is drivingly connected to the outer ring of the bearing (430) to drive the second brush (410) to rotate relative to the piston rod (200).

5. The hydraulic cylinder according to claim 4, characterized in that: The second cleaning component further comprises a third brush (450), and the third brush (450) is arranged on the side of the mounting plate (440) facing the cylinder body (100).

6. The hydraulic cylinder according to claim 1, characterized in that: A buffer assembly is provided between the piston rod (200) and the cylinder body (100) to buffer the movement of the piston rod (200) relative to the cylinder body (100).

7. The hydraulic cylinder according to claim 6, characterized in that: The buffer assembly includes a plurality of telescopic rods (510) and a plurality of springs (520), and the plurality of springs (520) are arranged in a one-to-one correspondence with the plurality of telescopic rods (510). The springs (520) are sleeved on the telescopic rods (510), and the two ends of the telescopic rod (510) have limit plates. The two ends of the spring (520) are respectively in contact with the two limit plates. The spring (520) is used to provide an elastic force for the two limit plates to move away from each other. The telescopic rod (510) is arranged on the side of the piston plate (210) facing the connecting end, and the telescopic rod (510) extends along the axial direction of the piston rod (200). The plurality of telescopic rods (510) are arranged in a ring-shaped interval around the axis of the piston plate (210).

8. The hydraulic cylinder according to claim 6, characterized in that: The connecting end is provided with a connecting plate (220), and the buffer assembly further includes a plurality of damping rods (530), wherein the damping rods (530) are fixedly arranged on a side of the connecting plate (220) facing the cylinder body (100), and the damping rods (530) extend along the axial direction of the piston rod (200), and the plurality of damping rods (530) are arranged in an annular manner around the axis of the connecting plate (220).

9. The hydraulic cylinder according to claim 1, characterized in that: A limiting assembly is provided in the oil storage cavity, and the limiting assembly is used to limit the displacement of the piston plate (210) in the oil storage cavity.

10. The hydraulic cylinder according to claim 9, characterized in that: The limiting assembly includes a plurality of limiting blocks (540), the limiting blocks (540) being supported by elastic material, the plurality of limiting blocks (540) being arranged at annular intervals on the inner wall of the cylinder body (100), the plurality of limiting blocks (540) being arranged at annular intervals forming a limiting ring group, two limiting ring groups being provided, and the two limiting ring groups being arranged on both sides of the piston plate (210) relative to each other along the axis of the piston rod (200).

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