Adjustable stroke anti-eccentric load hydraulic cylinder

Abstract

The present invention discloses an anti-eccentric load hydraulic cylinder with adjustable stroke, comprising a cylinder barrel, a cylinder bottom sealed with one end of the cylinder barrel, a piston connected with the inner wall of the cylinder barrel in a sliding and sealing manner, a piston rod fixedly connected with the piston at a first end, and a guide sleeve connected with the second end of the piston rod, the guide sleeve is connected with the inner wall of the cylinder barrel in a sliding and sealing manner, a stroke adjustment mechanism is arranged at the end of the cylinder barrel away from the cylinder bottom, the stroke adjustment mechanism comprises a supporting cylinder connected with the inner wall of the cylinder barrel in a sliding manner, a sliding block for fixing an external load connected with the inner wall of the supporting cylinder in a sliding manner, and an adjusting disk for adjusting the relative position of the supporting cylinder and the cylinder barrel, the two ends of the supporting cylinder are respectively abutted with the guide sleeve and the adjusting disk, and the piston rod drives the external load to reciprocate through the sliding block; the anti-eccentric load hydraulic cylinder with adjustable stroke of the present invention has strong anti-eccentric load capability, will not pollute the hydraulic system, can adjust the stroke, and can adapt to different user needs.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to an anti-eccentric load hydraulic oil cylinder with adjustable stroke. Background Art

[0002] The hydraulic cylinder is a widely used hydraulic actuator that converts hydraulic energy into mechanical energy. It mainly realizes linear reciprocating motion. It has the characteristics of simple structure, smooth and reliable operation, and large output thrust. It is widely used in engineering machinery, industrial automation and other fields.

[0003] At present, when the hydraulic cylinder works under certain working conditions, its piston rod not only bears axial force but also very large radial force. This situation is generally called cylinder off-center load. When the cylinder is subjected to a large off-center load, the axis of the piston rod and the axis of the cylinder barrel are offset by a certain angle, resulting in insufficient deformation of the seal on one side of the piston and the guide sleeve, causing oil leakage, and even causing the cylinder to get stuck, crush the support ring, scratch the inner wall of the cylinder barrel, etc. At the same time, the cylinder stroke is generally designed to be fixed, with poor versatility and general adaptability to working conditions. Some improved cylinders resist off-center loads by lengthening the piston or guide sleeve and using multiple support rings. However, their anti-off-center load capacity is limited, and the support rings will pollute the hydraulic system after being crushed. Summary of the invention

[0004] The present invention provides an anti-eccentric load hydraulic cylinder with adjustable stroke to solve the technical problems that the existing hydraulic cylinder has limited anti-eccentric load capacity, pollutes the hydraulic system after the support ring is crushed, has a fixed stroke, poor versatility and general adaptability to working conditions.

[0005] According to one aspect of the present invention, there is provided an adjustable stroke anti-eccentric load hydraulic oil cylinder, comprising a cylinder barrel, a cylinder bottom sealedly connected to one end of the cylinder barrel, a piston slidably and sealably connected to the inner side wall of the cylinder barrel, a piston rod fixedly connected to the piston at a first end, and a guide sleeve connected to the second end of the piston rod, the guide sleeve being slidably and sealably connected to the inner side wall of the cylinder barrel, the cylinder bottom, the piston and the guide sleeve enclose the inner side wall of the cylinder barrel to form two variable-volume first oil chambers and second oil chambers, the first oil chambers and the second oil chambers are respectively connected to an external oil circuit, a stroke adjustment mechanism is arranged at one end of the cylinder barrel away from the cylinder bottom, the stroke adjustment mechanism comprises a support cylinder slidably connected to the inner side wall of the cylinder barrel, a slider slidably connected to the inner side wall of the support cylinder for fixing an external load, and an adjustment disk for adjusting the relative position of the support cylinder and the cylinder barrel, the two ends of the support cylinder are respectively abutted against the guide sleeve and the adjustment disk, and the piston rod drives the external load to reciprocate through the slider.

[0006] Furthermore, the sliding block is provided with a radially arranged through hole, in which a pin for connecting an external load is embedded, and the supporting cylinder and the cylinder barrel are both provided with a sliding groove arranged in the axial direction and corresponding to the pin.

[0007] Furthermore, a protective cover is sleeved on the cylinder to prevent impurities from entering the slide groove. The length of the protective cover in the axial direction is greater than the length of the slide groove and both ends of the protective cover are sealed and connected to the outer side wall of the cylinder.

[0008] Furthermore, the cylinder is provided with a positioning through hole arranged in a radial direction for passing a fixing pin, and the adjusting disk is fixedly connected to the cylinder via the fixing pin.

[0009] Furthermore, the adjusting disk is provided with a first drain hole arranged along the axial direction.

[0010] Furthermore, a fixed bushing for limiting the maximum stroke of the anti-eccentric load hydraulic cylinder with adjustable stroke is provided on one end of the cylinder barrel away from the cylinder bottom, and a second sewage discharge hole arranged in the axial direction is opened on the fixed bushing.

[0011] Furthermore, the sliding block is provided with a window for reducing weight.

[0012] Furthermore, a gap between the sliding block and the supporting cylinder is smaller than a gap between the piston and the cylinder barrel.

[0013] Furthermore, a lubricating layer for lubrication is provided in the gap between the sliding block and the supporting cylinder.

[0014] The present invention has the following beneficial effects:

[0015] When the anti-eccentric load hydraulic cylinder with adjustable stroke of the present invention is in use, the amount of hydraulic oil in the first oil chamber and the second oil chamber is adjusted, and the sliding block is driven by the piston rod to drive the pin shaft to reciprocate, thereby driving the external load. When the external load driven by the hydraulic cylinder has an eccentric load, the eccentric load force will first act on the sliding block, and the force acting on the sliding block will be transmitted to the support cylinder. At the same time, the support cylinder is embedded in the cylinder barrel, and the cylinder barrel and the support cylinder cooperate to improve the overall rigidity, and all the eccentric load forces will be offset by the support cylinder. The piston rod will not have angular displacement under the eccentric load force, and the rubber seal on the piston and the guide sleeve will not be affected by the eccentric load. and damage or oil leakage; after the oil cylinder has been running for a long time, the slider will wear out first. Since the slider is not in direct contact with the hydraulic oil, the metal particles generated by the wear of the slider will not pollute the hydraulic system. The slider can be replaced by removing the pin shaft, which is easy to operate; when the oil cylinder stroke needs to be changed, the relative position of the support cylinder and the cylinder barrel can be adjusted by rotating the adjusting disk. Under the action of the hydraulic pressure, the guide sleeve will automatically abut the upper end surface of the support cylinder, and the support cylinder will automatically abut the upper end surface of the adjusting disk, which can realize the adjustment of the oil cylinder stroke. The stroke adjustment mechanism has a simple structure, the adjustment process is simple and fast, and the oil cylinder can adapt to different user needs.

[0016] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It is a structural schematic diagram of an anti-eccentric load hydraulic cylinder with adjustable stroke according to a preferred embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a guide sleeve of a preferred embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of a support cylinder of a preferred embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of a slider in a preferred embodiment of the present invention;

[0022] Figure 5 is a cross-sectional view of a slider according to a preferred embodiment of the present invention;

[0023] Figure 6 is a bottom view of a slider according to a preferred embodiment of the present invention;

[0024] Figure 7 is a schematic structural diagram of an adjustment disk according to a preferred embodiment of the present invention;

[0025] Figure 8 is a cross-sectional view of an adjustment disk according to a preferred embodiment of the present invention;

[0026] Fig. 9 is a bottom view of an adjustment disk according to a preferred embodiment of the present invention;

[0027] Fig.10 It is a schematic structural diagram of a fixed bushing according to a preferred embodiment of the present invention.

[0028] Legend:

[0029] 1. Cylinder barrel; 11. Tightening pin; 12. Positioning through hole; 2. Cylinder bottom; 21. First oil channel; 22. Second oil channel; 23. First O-ring; 3. Piston; 31. Third oil channel; 32. Piston seal; 33. First support ring; 4. Piston rod; 41. Oil distribution pipe; 411. Third O-ring; 412. Fifth O-ring; 5. Guide sleeve; 51. Second O-ring; 52. Rod seal; 53. Second Support ring; 6. First oil chamber; 7. Second oil chamber; 8. Stroke adjustment mechanism; 81. Support cylinder; 811. Slide groove; 82. Slider; 821. Through hole; 822. Connecting rod; 823. Fourth O-ring seal; 824. Groove; 825. Waist-shaped blind hole; 826. Weight reduction hole; 83. Adjustment plate; 831. First drain hole; 84. Pin; 85. Protective cover; 9. Fixed bushing; 91. Second drain hole; 92. Screw. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0031] like Figure 1As shown, the adjustable stroke anti-eccentric load hydraulic cylinder of this embodiment includes a cylinder barrel 1, a cylinder bottom 2 sealedly connected to one end of the cylinder barrel 1, a piston 3 slidably and sealably connected to the inner wall of the cylinder barrel 1, a piston rod 4 fixedly connected to the piston 3 at the first end, and also includes a guide sleeve 5 connected to the second end of the piston rod 4, the guide sleeve 5 is slidably and sealably connected to the inner wall of the cylinder barrel 1, the cylinder bottom 2, the piston 3 and the guide sleeve 5 are enclosed with the inner wall of the cylinder barrel 1 to form two first oil chambers 6 and second oil chambers 7 with variable volumes, the first oil chamber 6 and the second oil chamber 7 They are respectively connected to the external oil circuit, and a stroke adjustment mechanism 8 is arranged at one end of the cylinder 1 away from the cylinder bottom 2. The stroke adjustment mechanism 8 includes a support cylinder 81 slidably connected to the inner wall of the cylinder 1, a slider 82 slidably connected to the inner wall of the support cylinder 81 for fixing the external load, and an adjustment disk 83 for adjusting the relative position of the support cylinder 81 and the cylinder 1. The two ends of the support cylinder 81 are respectively abutted against the guide sleeve 5 and the adjustment disk 83, the slider 82 is fixedly connected to the piston rod 4, and the piston rod 4 drives the external load to reciprocate through the slider 82.

[0032] When in use, adjust the amount of hydraulic oil in the first oil chamber 6 and the second oil chamber 7, and drive the slider 82 through the piston rod 4 to drive the pin 84 to reciprocate, thereby driving the external load. When the external load driven by the hydraulic cylinder is eccentrically loaded, the eccentric load force will first act on the slider 82, and the force acting on the slider 82 will be transmitted to the support cylinder 81. At the same time, the support cylinder 81 is embedded in the cylinder barrel 1. The cylinder barrel 1 and the support cylinder 81 cooperate to improve the overall rigidity, and all the eccentric load forces will be offset by the support cylinder 81. The piston rod 4 will not have angular displacement under the eccentric load, and the rubber seals on the piston 3 and the guide sleeve 5 will not be damaged or leak oil due to the eccentric load. After the oil cylinder has been running for a long time, the slider 82 will wear out the support cylinder 81 first. Since the slider 82 is not in direct contact with the hydraulic oil, the metal particles generated by the wear of the slider 82 will not pollute the hydraulic system. The slider 82 can be replaced by removing the pin shaft 84, which is easy to operate. When the oil cylinder stroke needs to be changed, the relative position of the support cylinder 81 and the cylinder barrel 1 can be adjusted by rotating the adjustment disk 83. Under the action of the hydraulic pressure, the guide sleeve 5 will automatically abut the upper end surface of the support cylinder 81, and the support cylinder 81 will automatically abut the upper end surface of the adjustment disk 83, so that the oil cylinder stroke can be adjusted. The stroke adjustment mechanism 8 has a simple structure, and the adjustment process is simple and fast. The oil cylinder can adapt to different user needs. Specifically, a first O-ring 23 for sealing the gap between the cylinder bottom 2 and the inner wall of the cylinder barrel 1 is provided on the outer cylindrical surface of the cylinder bottom 2, and a piston seal 32 for sealing the gap between the piston 3 and the inner wall of the cylinder barrel 1 and a first support ring 33 for preventing the piston 3 from deforming are provided on the outer cylindrical surface of the piston 3. Figure 2As shown, the guide sleeve 5 is an annular structure, and a second O-ring 51 for the gap between the guide sleeve 5 and the inner wall of the cylinder 1 is provided on the outer cylindrical surface of the guide sleeve 5, and a rod seal 52 for the gap between the guide sleeve 5 and the outer wall of the piston rod 4 and a second support ring 53 for preventing the guide sleeve 5 from deforming are provided on the inner cylindrical surface of the guide sleeve 5, and a connecting rod 822 is provided on the slider 82, and the connecting rod 822 is inserted into the cavity of the piston rod 4, and a fourth O-ring seal 823 for sealing the gap between the connecting rod 822 and the inner wall of the piston rod 4 is provided on the outer cylindrical surface of the connecting rod 822, and the slider 82 is directly connected with the piston rod 4 in a sealed manner, which can improve the space utilization rate and is conducive to the miniaturization of the hydraulic cylinder. Optionally, a cylindrical mounting seat is provided on the guide sleeve 5, and the mounting seat is fixedly and sealedly connected with the second end of the piston rod 4, and the connecting rod 822 on the slider 82 is fixedly connected with the mounting seat. The mounting seat of this connection mode can share the pressure on the slider 82, thereby further improving the anti-eccentric load capacity of the hydraulic cylinder.

[0033] like Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment, a radially arranged through hole 821 is provided on the slider 82, and the pin 84 is embedded in the through hole 821. The support cylinder 81 and the cylinder barrel 1 are both provided with a slide groove 811 arranged along the axial direction and corresponding to the pin 84. The inner surface of the slide groove 811 is laser-welded with a wear-resistant metal layer. The pin 84 is driven by the slider 82 to reciprocate in the slide groove 811 of the support cylinder 81 and the cylinder barrel 1, thereby preventing the slider 82 from deflecting; the pin 84 passes through the through hole 821 and is symmetrically connected to the slide groove 811 at both ends for sliding connection, and has a stronger ability to resist off-center loads. Optionally, a waist-shaped blind hole 825 is provided on the slider 82, and the external load is inserted into the waist-shaped blind hole 825 on the slider 82 through a driving rod arranged along the axial direction of the cylinder 1. A mounting hole corresponding to the through hole 821 is provided on the driving rod, and the pin shaft 84 passes through the through hole 821 and the mounting hole to fix the first end of the driving rod to the slider 82, and the second end of the driving rod passes through the first sewage hole 831 and the second sewage hole 91 in sequence and leaves a sewage discharge gap.

[0034] like Figure 1 and Figure 3 As shown, in this embodiment, a protective cover 85 is provided on the cylinder 1 to prevent impurities from entering the slide groove 811. The length of the protective cover 85 in the axial direction is greater than the length of the slide groove 811 and both ends are sealed and connected to the outer wall of the cylinder 1; it can prevent the contact surface between the slider 82 and the support cylinder 81 from being contaminated by particles such as dust.

[0035] like Figure 1As shown, in this embodiment, a positioning through hole 12 arranged in a radial direction for passing a locking pin 11 is opened on the cylinder 1, and the adjusting disk 83 is fixedly connected to the cylinder 1 by the locking pin 11; after the adjusting disk 83 is rotated to a suitable position, it can be positioned by the locking pin 11, which can prevent the adjusting disk 83 from rotating due to vibration, thereby ensuring the accuracy of the stroke adjustment.

[0036] like Figure 1 , Figure 7 , Figure 8 and Fig. 9 As shown, in this embodiment, the adjustment disk 83 is provided with a first drain hole 831 arranged in the axial direction; the first drain hole 831 can reduce the weight of the adjustment disk 83 on the one hand, thereby reducing power consumption; on the other hand, the lubricating layer in the gap between the slider 82 and the support cylinder 81 has fluidity, and when the hydraulic cylinder is working, lubricant needs to be added to ensure the lubricating effect of the lubricating layer. The first drain hole 831 can discharge the flowing lubricant and the metal particles generated by the wear of the slider 82 out of the cylinder barrel 1, and allow the driving rod of the external load to pass through the adjustment disk 83. Optionally, the first drain hole 831 is a waist-shaped through hole, and the adjustment disk 83 can be driven to rotate by a screwdriver adapted to the waist-shaped through hole, which has a simple structure and is easy to operate.

[0037] like Figure 1 and Fig.10 As shown, in this embodiment, a fixed bushing 9 for limiting the maximum stroke of the anti-eccentric load hydraulic cylinder with adjustable stroke is provided on the end of the cylinder barrel 1 away from the cylinder bottom 2. The fixed bushing 9 is fixedly connected to the cylinder barrel 1 by two screws 92 arranged vertically and symmetrically to the axis. A second drain hole 91 arranged along the axial direction is opened on the fixed bushing 9. On the one hand, the second drain hole 91 can reduce the weight of the fixed bushing 9, thereby reducing power consumption; on the other hand, it can discharge the flowing lubricant and the metal particles generated by the wear of the slider 82 out of the cylinder barrel 1, and allow the driving rod of the external load to pass through the fixed bushing 9.

[0038] like Figure 6 As shown, in this embodiment, the slider 82 is provided with a window for weight reduction. On the one hand, the window can reduce the weight of the slider 82 without affecting the support strength of the slider 82, thereby reducing power consumption; on the other hand, the lubricant flowing down and the metal particles generated by the wear of the slider 82 can be discharged from the cylinder 1. In this embodiment, the window includes a groove 824 and a weight reduction hole 826 arranged along the circumference of the slider 82; the two grooves 824 are symmetrically arranged on the slider 82. Compared with the weight reduction hole 826, the groove 824 is conducive to reducing the friction between the slider 82 and the support cylinder 81 without affecting the support strength. It can be understood that the window on the slider 82 can also be either a groove 824 or a weight reduction hole 826.

[0039] like Figure 1As shown, in this embodiment, the gap between the slider 82 and the support cylinder 81 is smaller than the gap between the piston 3 and the cylinder 1, so that the slider 82 and the support cylinder 81 are under pressure to prevent the piston 3 from being damaged or leaking due to eccentric loading. Optionally, the gap between the slider 82 and the support cylinder 81 is 0.05 mm.

[0040] like Figure 1 As shown, in this embodiment, a lubricating layer is provided in the gap between the slider 82 and the support cylinder 81. On the one hand, it can reduce the friction between the slider 82 and the support cylinder 81 and improve the service life of the slider 82. On the other hand, metal particles generated by the wear of the slider 82 will adhere to the lubricant and be discharged from the cylinder 1 along with the lubricant.

[0041] like Figure 1 As shown, in this embodiment, the cylinder bottom 2 is provided with a first oil passage 21 and a second oil passage 22, the piston rod 4 is a hollow cylindrical structure, the piston 3 is provided with a third oil passage 31 for connecting the cavity of the piston rod 4 and the second oil chamber 7, an oil distribution pipe 41 is provided in the cavity of the piston rod 4, one end of the oil distribution pipe 41 passes through the piston 3 and is connected to the external oil circuit through the second oil passage 22, and the first oil chamber 6 is connected to the external oil circuit through the first oil passage 21; the outer cylindrical surface of the oil distribution pipe 41 is provided with a sealing member for sealing the oil distribution pipe 41 and the second oil passage 22 The third O-ring 411 is used to seal the gap between the oil distribution pipe 41 and the inner cylindrical surface of the piston 3, and the fifth O-ring 412 is used to seal the gap between the oil distribution pipe 41 and the inner cylindrical surface of the piston 3. When in use, the amount of hydraulic oil in the first oil chamber 6 and the second oil chamber 7 is adjusted by the first oil channel 21 and the second oil channel 22, thereby driving the slider 82 to extend and retract. The first oil channel 21 and the second oil channel 22 are arranged on the cylinder bottom 2, which can avoid opening holes at the positions of the cylinder barrel 1 corresponding to the first oil chamber 6 and the second oil chamber 7, can ensure the strength of the cylinder barrel 1, and thus improve the anti-eccentric load capability.

[0042] The working principle of the present invention is that when there is an eccentric load on the external load driven by the hydraulic cylinder, the eccentric load force will first act on the slider 82, and the force acting on the slider 82 will be transmitted to the support cylinder 81, and the contact surfaces of the slider 82 and the support cylinder 81 are coated with grease and the fitting clearance is smaller than the fitting clearance between the piston 3 and the cylinder barrel 1, and also smaller than the clearance between the guide sleeve 5 and the piston rod 4. At the same time, the support cylinder 81 is embedded in the cylinder barrel 1, and the cylinder barrel 1 and the support cylinder 81 cooperate to improve the overall rigidity, and all the eccentric load forces will be offset by the support cylinder 81. The piston rod 4 will not have angular displacement under the eccentric load, and the rubber seals on the piston 3 and the guide sleeve 5 will not be damaged or leak due to the eccentric load. After the cylinder has been running for a long time, the slider 82 will wear out first, and since the slider 82 is not in direct contact with the hydraulic oil, the wear of the slider 82 will not occur. The metal particles will not pollute the hydraulic system. The sliding block 82 can be replaced by removing the protective cover 85 and the pin shaft 84, which is easy to operate. When the cylinder stroke needs to be changed, the fixing pin 11 can be loosened, and then the adjusting disk 83 can be rotated counterclockwise or clockwise. Rotating the adjusting disk 83 counterclockwise will make it move downward, and rotating the adjusting disk 83 clockwise will make it move upward. After moving upward or downward, the fixing pin 11 is screwed into the appropriate positioning through hole 12 of the cylinder barrel 1, and the adjusting disk 83 can be rotated to adjust the relative position of the support cylinder 81 and the cylinder barrel 1. Under the action of the hydraulic pressure, the guide sleeve 5 will automatically abut the upper end surface of the support cylinder 81, and the support cylinder 81 will automatically abut the upper end surface of the adjusting disk 83, so that the cylinder stroke can be adjusted. The stroke adjustment mechanism 8 has a simple structure, and the adjustment process is simple and fast, and the cylinder can adapt to different user needs.

[0043] Advantages of the present invention:

[0044] 1. The slider 82 at the end of the piston rod 4 contacts and guides the support cylinder 81 to resist eccentric load. All eccentric load forces are offset by the slider 82 and the wear-resistant support cylinder 81, completely eliminating the influence of eccentric load on the oil cylinder. The sealing structure on the piston seal 32 and the guide sleeve 5 will not be damaged or leak due to eccentric load.

[0045] 2. The surface of the support cylinder 81 is treated with wear-resistant metal laser cladding. The support cylinder 81 will not be excessively worn during the entire service life of the cylinder. It only needs to replace the slider 82 regularly, and the replacement operation of the slider 82 is simple;

[0046] 3. The support cylinder 81 is embedded in the cylinder barrel 1 and has good rigidity, which can well ensure that the movement axis of the piston rod 4 and the slider 82 completely coincides with the movement axis of the piston 3, and has a significant anti-eccentric load effect;

[0047] 4. The guide sleeve 5 adopts a floating design, that is, it is not fixedly connected to the cylinder barrel 1. By adjusting the position of the adjustment disk 83, the position of the guide sleeve 5 can be changed, thereby changing the stroke of the oil cylinder. The adjustment process is simple and fast, and the oil cylinder can adapt to different user needs. The stroke of the oil cylinder can be changed by changing the position of the guide sleeve 5

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-eccentric load hydraulic cylinder with adjustable stroke, comprising a cylinder barrel (1), a cylinder bottom (2) sealedly connected to one end of the cylinder barrel (1), a piston (3) slidably and sealedly connected to the inner side wall of the cylinder barrel (1), and a piston rod (4) whose first end is fixedly connected to the piston (3), characterized in that: The invention also comprises a guide sleeve (5) connected to the second end of the piston rod (4), the guide sleeve (5) being slidably and sealingly connected to the inner wall of the cylinder barrel (1), the cylinder bottom (2), the piston (3) and the guide sleeve (5) and the inner wall of the cylinder barrel (1) forming a first oil chamber (6) and a second oil chamber (7) with variable volumes, the first oil chamber (6) and the second oil chamber (7) being respectively connected to external oil circuits, A stroke adjustment mechanism (8) is arranged at one end of the cylinder barrel (1) away from the cylinder bottom (2), and the stroke adjustment mechanism (8) comprises a support cylinder (81) slidably connected to the inner side wall of the cylinder barrel (1), a slider (82) slidably connected to the inner side wall of the support cylinder (81) for fixing an external load, and an adjustment disk (83) for adjusting the relative position of the support cylinder (81) and the cylinder barrel (1), and the two ends of the support cylinder (81) are respectively in contact with the guide sleeve (5) and the adjustment disk (83). The piston rod (4) drives the external load to reciprocate via the slider (82).

2. The adjustable stroke anti-eccentric load hydraulic cylinder according to claim 1, characterized in that: The slider (82) is provided with a radially arranged through hole (821), a pin shaft (84) for connecting an external load is embedded in the through hole (821), and a sliding groove corresponding to the pin shaft (84) and arranged in the axial direction is provided on the support cylinder (81) and the cylinder barrel (1).

3. The adjustable stroke anti-eccentric load hydraulic cylinder according to claim 2, characterized in that: The cylinder barrel (1) is sleeved with a protective cover (85) for preventing impurities from entering the slide groove; the length of the protective cover (85) in the axial direction is greater than the length of the slide groove, and both ends of the protective cover are sealedly connected to the outer wall of the cylinder barrel (1).

4. The adjustable stroke anti-eccentric load hydraulic cylinder according to claim 1, characterized in that: The cylinder barrel (1) is provided with a positioning through hole (12) arranged in a radial direction for passing a fixing pin (11), and the adjustment disk (83) is fixedly connected to the cylinder barrel (1) via the fixing pin (11).

5. The adjustable stroke anti-eccentric load hydraulic cylinder according to claim 1, characterized in that: The regulating disk (83) is provided with a first sewage discharge hole (831) arranged along the axial direction.

6. The adjustable stroke anti-eccentric load hydraulic cylinder according to claim 5, characterized in that: A fixed bushing (9) for limiting the maximum stroke of the adjustable stroke anti-eccentric load hydraulic cylinder is provided on one end of the cylinder barrel (1) away from the cylinder bottom (2), and a second sewage discharge hole (91) arranged in the axial direction is provided on the fixed bushing (9).

7. The adjustable stroke anti-eccentric load hydraulic cylinder according to claim 1, characterized in that: The sliding block (82) is provided with a window for reducing weight.

8. The anti-eccentric load hydraulic cylinder with adjustable stroke according to claim 1, characterized in that: The gap between the sliding block (82) and the supporting cylinder (81) is smaller than the gap between the piston (3) and the cylinder barrel (1).

9. The anti-eccentric load hydraulic cylinder with adjustable stroke according to claim 8, characterized in that: A lubricating layer for lubrication is provided in the gap between the sliding block (82) and the supporting cylinder (81).

10. The anti-eccentric load hydraulic cylinder with adjustable stroke according to claim 1, characterized in that: The cylinder bottom (2) is provided with a first oil passage (21) and a second oil passage (22); the piston rod (4) is a hollow cylindrical structure; the piston (3) is provided with a third oil passage (31) for connecting the cavity of the piston rod (4) and the second oil chamber (7); an oil distribution pipe (41) is provided in the cavity of the piston rod (4); one end of the oil distribution pipe (41) passes through the piston (3) and is connected to an external oil circuit through the second oil passage (22); and the first oil chamber (6) is connected to an external oil circuit through the first oil passage (21).

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