High-stability long-stroke hydraulic cylinder

Abstract

The invention relates to the technical field of hydraulic cylinders, in particular to a high-stability long-stroke hydraulic cylinder which comprises a cylinder barrel, a first end cover and a second end cover, the first end cover and the second end cover are arranged at the two ends of the cylinder barrel in a sealed mode, mounting rings are fixed to the two ends of the outer wall of the cylinder barrel, and six mounting holes which are annularly distributed at equal intervals are formed in the two mounting rings and the second end cover. Six mounting cylinders penetrating through the mounting holes at equal intervals are fixed to one side of the first end cover, one end of the outer wall of each mounting cylinder is in threaded connection with a nut attached to the outer wall of one side of the second end cover, and a piston rod is inserted in the middle of the second end cover in a penetrating mode. The six mounting barrels and the six reinforcing rods are used for guaranteeing the operation stability of the piston rod and providing supporting stress for the piston rod in the 360-degree direction, and the problem that when the end of the piston rod is subjected to large inclined extrusion force, the piston rod and the whole hydraulic cylinder are scratched is solved; the overall operation stability of the hydraulic cylinder is guaranteed, and the service life of the hydraulic cylinder is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic cylinders, and in particular to a long-stroke hydraulic cylinder with high stability. Background Art

[0002] A hydraulic cylinder is a device that transmits force through the pressure of a liquid. A long-stroke hydraulic cylinder refers to a cylinder with a long stroke. A long-stroke hydraulic cylinder consists of a cylinder barrel, a piston rod, a piston, etc., and the extension and retraction of the cylinder is achieved by controlling the inflow and outflow of the liquid. The advantages of a long-stroke hydraulic cylinder over an ordinary cylinder are mainly reflected in the following aspects: a larger stroke range, a larger working torque, and precise positioning control. In the field of engineering machinery, long-stroke hydraulic cylinders are widely used in various large-scale equipment. For example, in equipment such as bulldozers, loaders, and excavators that require large strokes and large working torques, long-stroke hydraulic cylinders can provide stable force support, allowing the equipment to successfully complete its work tasks; in construction projects, long-stroke hydraulic cylinders also play an important role. For example, in the construction of large bridges, the support frame needs to be extended and adjusted, which requires long-stroke hydraulic cylinders to provide long-distance strokes and high-precision positioning capabilities.

[0003] After searching, a stable hydraulic oil cylinder with publication number CN202628672U is found, which includes a cylinder body, a piston and a piston rod are arranged in the cylinder body, the piston is fixedly connected to the piston rod, a cylinder head and a cylinder tail are respectively fixed at both ends of the cylinder body, a venting device is arranged on the cylinder body, the venting device is communicated with the inner cavity of the cylinder body, a guide sleeve is arranged between the cylinder head and the piston rod, and a plurality of oil outlet channels are opened on the guide sleeve. Since the venting device is arranged on the cylinder body, the stable hydraulic oil cylinder has a simple structure, simplified oil pipelines, and is easy to maintain. At the same time, since a guide sleeve is arranged between the cylinder head and the piston rod, and a plurality of oil outlet channels are opened on the guide sleeve, the compressed high-pressure oil and gas can be discharged in time with the relative sliding of the piston rod and the guide sleeve, thereby reducing the speed fluctuation of the piston rod and greatly improving the stability of the operation of the hydraulic oil cylinder.

[0004] In combination with the above patents, it is found that the prior art has the following shortcomings: after the hydraulic cylinder in the prior art is extended and retracted to a certain length, when the end of the piston rod is subjected to a large tilting extrusion force, the piston rod will be tilted, resulting in scratches between the piston rod and the hydraulic cylinder, causing the hydraulic cylinder to be unstable and even causing tipping, thereby shortening the service life of the hydraulic cylinder. Therefore, a highly stable long-stroke hydraulic cylinder is urgently needed to solve the above problems. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a high-stability long-stroke hydraulic cylinder to overcome the above-mentioned technical problems existing in the existing related art.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A highly stable long-stroke hydraulic cylinder comprises a cylinder barrel and a first end cover and a second end cover which are sealed at both ends of the cylinder barrel, wherein both ends of the outer wall of the cylinder barrel are fixed with mounting rings, and the two mounting rings and the second end cover are provided with six mounting holes distributed in an annular shape with equal distances, six mounting cylinders which pass through the mounting holes with equal distances are fixed on one side of the first end cover, and nuts which fit the outer wall of one side of the six mounting cylinders are screwed on one end of the outer wall of each of the six mounting cylinders, a piston rod is inserted through the middle position of the second end cover, and a first piston which fits the inner wall of the cylinder barrel is installed on one end of the piston rod, and a first buffer stabilization assembly is arranged at both ends of the first piston and inside the first end cover and the second end cover, a reinforcement seat is fixedly arranged at one end of the outer wall of the piston rod close to the second end cover, and reinforcement rods which are equidistantly inserted into the six mounting cylinders are fixed on one side of the reinforcement seat, wherein the second buffer stabilization assembly is arranged at one end of three of the reinforcement rods close to the first end cover, and a third buffer stabilization assembly is arranged at one side of the inner wall of three of the mounting cylinders close to the second end cover.

[0008] Furthermore, an oil inlet cavity is opened in the middle position inside the first end cover, and an oil inlet nozzle extending from the first end cover is arranged on the oil inlet cavity, a first blocking hole connected with the cylinder barrel is opened in the middle position of one end of the oil inlet cavity, and an ear seat is fixed in the middle position of the other side of the first end cover.

[0009] Furthermore, an oil drain chamber is provided in the middle position inside the second end cover, and an oil drain nozzle extending from the second end cover is provided on the oil drain chamber, a second sealing hole connected with the cylinder barrel is provided in the middle position of one end of the oil drain chamber, a through hole and a slot are provided in sequence in the middle position of the other end of the oil drain chamber, the piston rod passes through the second sealing hole, the through hole and the slot, and a sealing device is provided inside the slot.

[0010] Furthermore, the sealing device includes a key that is interference fit on the inner wall of the slot, and a bushing is interference fit in the middle position of the inner wall of the key, a dust ring is provided at one end of the bushing and one end of the inner wall of the key, and a sealing ring is provided at the other end of the bushing and the other end of the inner wall of the key, and the dust ring and the sealing ring are both attached to the surface of the piston rod.

[0011] Furthermore, the first buffer stabilization component includes a buffer cavity opened on the first end cover and the second end cover, and a second buffer hole connected to the oil inlet cavity and the oil discharge cavity is opened at one end of the top of the buffer cavity, and a first buffer hole connected to the cylinder is opened at the other end of the top of the buffer cavity, and the inner diameters of the first buffer hole and the second buffer hole are smaller than the inner diameters of the first blocking hole and the second blocking hole, and the first blocking head and the second blocking head for blocking the first blocking hole and the second blocking hole are fixed at the middle position of the two ends of the first piston, and the lengths of the first blocking head and the second blocking head are greater than the lengths of the first blocking hole and the second blocking hole, and a volume adjustment component is provided at the bottom of the buffer cavity.

[0012] Furthermore, the volume adjustment component includes a threaded hole opened at the bottom of the two buffer chambers, and the bottom of the threaded hole is provided with an adjustment groove, the inner wall of the threaded hole is screwed with a threaded column, the bottom of the threaded column is arranged inside the adjustment groove, and the top of the threaded column is installed with a second piston that fits the inner wall of the buffer chamber.

[0013] Furthermore, the second buffer stabilization assembly includes a buffer ring fixed to the other end of the inner wall of three of the mounting cylinders, and one end of the three reinforcement rods close to the first end cover is equipped with a third piston that fits against the inner wall of the mounting cylinder, one side of the outer wall of the third piston fits against the inner wall of the buffer ring, one side of the inner wall of the buffer ring is designed to be truncated, and the other side of the inner wall of the buffer ring is designed to be pore-shaped, and three L-shaped flow channels for connecting the interior of the oil inlet chamber and the interior of the buffer ring are opened in the first end cover.

[0014] Furthermore, a ball sleeve is fixed to one end of the inner wall of the installation tube close to the second end cover, and the reinforcement rod is attached to the inner wall of the ball sleeve.

[0015] Furthermore, the third buffer stabilization component includes a spring fixed to one end of three ball sleeves, and one end of the spring is fixed with a buffer sleeve mounted on the outer wall of the reinforcement rod, the inner diameter of the buffer sleeve is larger than the outer diameter of the reinforcement rod, and L-shaped guide plates are fixed to the top and bottom of the side of the buffer sleeve close to the ball sleeve, and the inner wall of the mounting tube is provided with two guide grooves for inserting one end of the two L-shaped guide plates.

[0016] Furthermore, the angle between each of the three second buffer stabilization components and the three third buffer stabilization components is 120°, and the cross-sections of the first end cover, the two mounting rings, the second end cover and the reinforcement seat are all designed to be hexagonal plum blossom shapes.

[0017] Beneficial effects of the present invention:

[0018] 1. A highly stable long-stroke hydraulic cylinder provided by the present invention comprises a first end cover, a cylinder barrel, a second end cover, a piston rod, a first piston, a first buffer stabilization assembly and a volume adjustment assembly. When the first piston moves to the first buffer stabilization assembly, the first plugging head is inserted into and blocks the first plugging hole, and the second plugging head is inserted into and blocks the second plugging hole. At this time, the flow path of the hydraulic oil is turned from the first plugging hole with a large aperture and the second plugging hole to the first buffer hole with a small aperture, and flows into the oil inlet cavity and the oil discharge cavity along the buffer cavity and the second buffer hole, forcing the hydraulic oil to be squeezed out through the small hole, generating a large resistance. At this time, the speed of the first piston is forced to decrease, so that the speed of the piston rod decreases when it approaches the maximum stroke and the minimum stroke. On the one hand, the running stability of the long-stroke hydraulic cylinder at the starting and ending points is ensured, and on the other hand, the collision and noise phenomena are avoided, and the piston movement accuracy is also prevented from being affected or even the piston is damaged. In addition, the volume of the buffer cavity can be adjusted by the volume adjustment assembly, so that the hydraulic oil flows in the buffer cavities with different volumes. The friction between the hydraulic oil and the inner wall of the buffer cavity can also further buffer the hydraulic oil, further ensuring the stable performance of the hydraulic cylinder when it reaches the starting and ending points.

[0019] 2. A highly stable long-stroke hydraulic cylinder provided by the present invention can be assembled as a whole by means of a first end cover, a mounting ring, a cylinder barrel, a second end cover, a mounting hole, a mounting barrel, a nut, a reinforcement seat, a piston rod, a ball sleeve and a reinforcement rod through the cooperation of the mounting barrel, the mounting hole and the nut. In the process of extension and retraction of the piston rod, the reinforcement seat and the reinforcement rod are simultaneously carried to move, so that the reinforcement rod can be extended and retracted in the mounting barrel. Thus, while providing assembly performance through the mounting barrel and the reinforcement rod, six mounting barrels and six reinforcement rods can be used to ensure the operating stability of the piston rod and provide supporting stress for the piston rod in a 360-degree direction, so as to avoid the problem of scratching between the piston rod itself and the hydraulic cylinder as a whole when the end of the piston rod is subjected to a large inclined extrusion force, thereby ensuring the overall operating stability of the hydraulic cylinder, avoiding the phenomenon of rollover and tipping, and improving the service life of the hydraulic cylinder.

[0020] 3. The present invention provides a highly stable long-stroke hydraulic cylinder, which, through the provision of a first end cover, a mounting cylinder, a second buffer stabilization component, a reinforcement rod, a ball sleeve and a third buffer stabilization component, can squeeze the third buffer stabilization component to shrink when the piston rod is about to reach the maximum stroke through the third piston on the reinforcement rod; and can also reduce the aperture of the buffer ring through the third piston when the piston rod is about to reach the minimum stroke, thereby reducing the running speed of the reinforcement rod and the third piston, so that the second buffer stabilization component and the third buffer stabilization component cooperate with the first buffer stabilization component to perform further buffer stabilization processing, thereby fully ensuring the stable operation of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of a highly stable long-stroke hydraulic cylinder of the present invention.

[0023] Figure 2 It is a front cross-sectional view of a highly stable long-stroke hydraulic cylinder of the present invention.

[0024] Figure 3 A highly stable long-stroke hydraulic cylinder according to the present invention Figure 2 Enlarged schematic diagram at point A in the middle.

[0025] Figure 4 A highly stable long-stroke hydraulic cylinder according to the present invention Figure 2 Enlarged schematic diagram of point B in the middle.

[0026] Figure 5 The figure is a side view of a highly stable long-stroke hydraulic cylinder of the present invention.

[0027] Figure 6 This is a middle cross-sectional view of a highly stable long-stroke hydraulic cylinder of the present invention.

[0028] Figure 7 This is a schematic diagram of the first end cover and mounting tube structure of a high-stability long-stroke hydraulic cylinder of the present invention.

[0029] Figure 8 The present invention is a schematic diagram of the mounting ring and mounting hole structure of a high-stability long-stroke hydraulic cylinder.

[0030] Fig. 9 This is a cross-sectional view of a first end cover, a second end cover and a mounting tube of a high-stability long-stroke hydraulic cylinder of the present invention.

[0031] Fig.10 A highly stable long-stroke hydraulic cylinder according to the present invention Fig. 9 Enlarged schematic diagram at point C in the middle.

[0032] Fig.11 A highly stable long-stroke hydraulic cylinder according to the present invention Fig. 9 Enlarged schematic diagram at point D in the middle.

[0033] Fig.12 The present invention is a schematic structural diagram of a buffer ring and an L-shaped guide plate of a high-stability long-stroke hydraulic cylinder.

[0034] Fig.13 This is a cutaway view of a first end cover of a high-stability long-stroke hydraulic cylinder of the present invention.

[0035] Fig.14 This is a cross-sectional view of a first end cover of a highly stable long-stroke hydraulic cylinder of the present invention.

[0036] Fig.15 This is a cutaway view of a second end cover of a high-stability long-stroke hydraulic cylinder of the present invention.

[0037] Fig.16 This is a cross-sectional view of a second end cover of a highly stable long-stroke hydraulic cylinder of the present invention.

[0038] In the figure:

[0039] 1. First end cover; 2. Mounting ring; 3. Cylinder barrel; 4. Mounting barrel; 5. Second end cover; 6. Nut; 7. Reinforcement seat; 8. Piston rod; 9. Oil discharge nozzle; 10. Oil inlet nozzle; 11. Ear seat; 12. Oil inlet chamber; 13. L-shaped flow channel; 14. Second buffer hole; 15. First plugging head; 16. First piston; 17. Second plugging head; 18. Second plugging hole; 19. Oil discharge chamber; 20. First buffer hole; 21. Buffer chamber; 22. second piston; 23. threaded column; 24. adjustment groove; 25. sealing ring; 26. bushing; 27. dust ring; 28. key; 29. ​​ball sleeve; 30. reinforcement rod; 31. third piston; 32. mounting hole; 33. threaded hole; 34. first blocking hole; 35. buffer ring; 36. through hole; 37. slot; 38. buffer sleeve; 39. spring; 40. guide groove; 41. L-shaped guide plate. DETAILED DESCRIPTION

[0040] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0041] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0042] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Embodiment 1:

[0045] According to an embodiment of the present invention,

[0046] See also Figure 1-16A highly stable long-stroke hydraulic cylinder comprises a cylinder barrel 3 and a first end cover 1 and a second end cover 5 which are sealed at both ends of the cylinder barrel 3. Both ends of the outer wall of the cylinder barrel 3 are fixed with mounting rings 2, and the two mounting rings 2 and the second end cover 5 are provided with six mounting holes 32 which are equidistantly distributed in an annular manner. Six mounting cylinders 4 which pass through the mounting holes 32 at equal distances are fixed on one side of the first end cover 1. One end of the outer wall of the six mounting cylinders 4 is screwed with a nut 6 which is attached to the outer wall of one side of the second end cover 5. A piston rod 8 is inserted in the middle position of the second end cover 5, and one end of the piston rod 8 is installed with a first piston 16 which is attached to the inner wall of the cylinder barrel 3. The first end cover 1, the mounting ring 2, the cylinder barrel 3 and the second end cover 5 can be integrally assembled under the cooperation of the mounting cylinder 4, the mounting holes 32 and the nut 6. During the assembly operation, during the extension and retraction process of the piston rod 8, the reinforcing seat 7 and the reinforcing rod 30 are simultaneously carried to move, so that the reinforcing rod 30 is extended and retracted in the mounting tube 4, thereby utilizing the six mounting tubes 4 and the six reinforcing rods 30 to ensure the operational stability of the piston rod 8 and provide supporting stress for the piston rod 8 in a 360-degree direction, thereby avoiding the problem of scratching between the piston rod 8 itself and the hydraulic cylinder as a whole when the end of the piston rod 8 is subjected to a large tilting extrusion force, thereby ensuring the overall operational stability of the hydraulic cylinder, avoiding the phenomenon of rollover and tipping, and improving the service life of the hydraulic cylinder. An oil inlet chamber 12 is provided in the middle position of the interior of the first end cover 1, and an oil inlet nozzle 10 extending from the first end cover 1 is provided on the oil inlet chamber 12, and a nozzle 10 extending from the first end cover 1 is provided at the middle position of one end of the oil inlet chamber 12. A first plugging hole 34 connected to the cylinder 3, an ear seat 11 is fixed at the middle position of the other side of the first end cover 1, an oil drain chamber 19 is opened at the middle position inside the second end cover 5, and an oil drain nozzle 9 extending from the second end cover 5 is arranged on the oil drain chamber 19, a second plugging hole 18 connected to the cylinder 3 is opened at the middle position of one end of the oil drain chamber 19, a through hole 36 and a slot 37 are opened in sequence at the middle position of the other end of the oil drain chamber 19, the piston rod 8 passes through the second plugging hole 18, the through hole 36 and the slot 37, a sealing device is arranged inside the slot 37, the sealing device includes a key 28 which is interference-fitted on the inner wall of the slot 37, and a bushing 26 is interference-fitted at the middle position of the inner wall of the key 28, and a dust ring 27 is arranged at one end of the bushing 26 and one end of the inner wall of the key 28, A sealing ring 25 is provided at the other end of the bushing 26 and the other end of the inner wall of the key 28, and the dust ring 27 and the sealing ring 25 are both fitted on the surface of the piston rod 8. A first buffer stabilization assembly is provided at both ends of the first piston 16 and inside the first end cover 1 and the second end cover 5. A reinforcement seat 7 is fixedly installed at one end of the piston rod 8 close to the outer wall of the second end cover 5, and reinforcement rods 30 equidistantly inserted in six mounting tubes 4 are fixed on one side of the reinforcement seat 7, wherein three reinforcement rods 30 are provided with a second buffer stabilization assembly at one end close to the first end cover 1, and the second buffer stabilization assembly includes a buffer ring 35 fixed at the other end of the inner wall of three mounting tubes 4, and three reinforcement rods 30 are provided with a third piston 31 fitted to the inner wall of the mounting tube 4 at one end close to the first end cover 1.One side of the outer wall of the third piston 31 is fitted on the inner wall of the buffer ring 35, one side of the inner wall of the buffer ring 35 is designed to be truncated, and the other side of the inner wall of the buffer ring 35 is designed to be pore-shaped. Three L-shaped flow channels 13 for connecting the interior of the oil inlet chamber 12 and the interior of the buffer ring 35 are opened in the first end cover 1, and three of the mounting tubes 4 are provided with a third buffer stabilization component on one side of the inner wall close to the second end cover 5. The position of the third buffer stabilization component corresponds to that of the second buffer stabilization component. A ball sleeve 29 is fixed to one end of the mounting tube 4 close to the inner wall of the second end cover 5, and the reinforcement rod 30 is fitted on the inner wall of the ball sleeve 29. The third buffer stabilization component includes a spring 39 fixed at one end of three of the ball sleeves 29, and the spring 39 A buffer sleeve 38 sleeved on the outer wall of the reinforcement rod 30 is fixed at one end, and the inner diameter of the buffer sleeve 38 is larger than the outer diameter of the reinforcement rod 30. L-shaped guide plates 41 are fixed on the top and bottom of the side of the buffer sleeve 38 close to the ball sleeve 29. Two guide grooves 40 for inserting one end of the two L-shaped guide plates 41 are opened on the inner wall of the mounting cylinder 4. When the piston rod 8 is about to reach the maximum stroke, the reinforcement rod 30 and the piston rod 8 are further buffered by the third buffer stabilization component to fully ensure the operation stability of the end point of the long-stroke hydraulic cylinder. When the piston rod 8 is about to reach the minimum stroke, the reinforcement rod 30 and the piston rod 8 are further buffered by the second buffer stabilization component to fully ensure the operation stability of the starting point of the hydraulic cylinder.

[0047] Specifically, the first buffer stabilization component includes a buffer cavity 21 opened on the first end cover 1 and the second end cover 5, and a second buffer hole 14 communicating with the oil inlet cavity 12 and the oil discharge cavity 19 is opened at one end of the top of the buffer cavity 21, and a first buffer hole 20 communicating with the cylinder 3 is opened at the other end of the top of the buffer cavity 21. The inner diameters of the first buffer hole 20 and the second buffer hole 14 are smaller than the inner diameters of the first blocking hole 34 and the second blocking hole 18. The first blocking head 15 and the second blocking head 17 for blocking the first blocking hole 34 and the second blocking hole 18 are fixed at the middle position of both ends of the first piston 16. The lengths of the first blocking head 15 and the second blocking head 17 are greater than the lengths of the first blocking hole 34 and the second blocking hole 18. Figure 2 , Figure 3 , Figure 4 , Fig. 9 , Fig.10 , Fig.13 , Fig.14 , Fig.15 and Fig.16As shown, the above-mentioned first buffer stabilization component is adopted. When the first piston 16 moves to the first buffer stabilization component, the first plugging head 15 is inserted into and blocks the first plugging hole 34, and the second plugging head 17 is inserted into and blocks the second plugging hole 18. At this time, the flow path of the hydraulic oil is turned from the large-aperture first plugging hole 34 and the second plugging hole 18 to the small-aperture first buffer hole 20, and flows into the oil inlet chamber 12 and the oil discharge chamber 19 along the buffer chamber 21 and the second buffer hole 14, forcing the hydraulic oil to be squeezed out through the small holes, generating greater resistance. At this time, the speed of the first piston 16 is forced to decrease, so that the speed of the piston rod 8 decreases when approaching the maximum stroke and the minimum stroke, fully ensuring the operating stability of the long-stroke hydraulic cylinder starting and ending points, avoiding the occurrence of cylinder collision and noise, and preventing the piston movement accuracy from being affected or even damaging the piston.

[0048] Specifically, the angles between the three second buffer stabilization components and the three third buffer stabilization components are 120°, and the cross-sections of the first end cover 1, the two mounting rings 2, the second end cover 5 and the reinforcement seat 7 are all designed to be hexagonal plum blossom shapes.

[0049] Embodiment 2:

[0050] See also Figure 4 , Fig. 9 , Fig.10 , Fig.13 , Fig.14 , Fig.15 and Fig.16 As shown, compared with Example 1, the bottom of the buffer chamber 21 of this embodiment is provided with a volume adjustment component, the volume adjustment component includes a threaded hole 33 opened at the bottom of the two buffer chambers 21, and the bottom of the threaded hole 33 is provided with an adjustment groove 24, the inner wall of the threaded hole 33 is screwed with a threaded column 23, the bottom of the threaded column 23 is arranged inside the adjustment groove 24, and the top of the threaded column 23 is installed with a second piston 22 that fits the inner wall of the buffer chamber 21. By adopting the above-mentioned volume adjustment component, the volume of the buffer chamber 21 can be adjusted, the friction force of the hydraulic oil flowing through the buffer chamber 21 can be changed, and the buffering performance of the entire hydraulic cylinder can be changed.

[0051] In summary, with the aid of the above technical scheme of the present invention, the working principle of the present invention is as follows: when the entire hydraulic cylinder is extended, the hydraulic oil in the hydraulic system enters the oil inlet chamber 12 through the oil inlet nozzle 10, squeezing the first plugging head 15, the first piston 16 and the piston rod 8 to extend. At this time, the rodless chamber of the hydraulic cylinder is filled with hydraulic oil, and the hydraulic oil in the rod chamber will flow back to the hydraulic system through the oil discharge chamber 19 and the oil discharge nozzle 9. When the second plugging head 17 at one end of the first piston 16 blocks the second plugging hole 18, the flow path of the hydraulic oil turns from the second plugging hole 18 with a large aperture to the first buffer hole 20 with a small aperture, and flows into the oil discharge chamber 19 along the buffer chamber 21 and the second buffer hole 14, forcing the hydraulic oil to be squeezed out through the small hole, generating greater resistance, reducing the speed of the first piston 16, and reducing the speed of the piston rod 8 when it approaches the maximum stroke, thereby ensuring the operating stability of the end point of the long-stroke hydraulic cylinder;

[0052] When the entire hydraulic cylinder contracts, the hydraulic oil in the hydraulic system enters the oil discharge chamber 19 through the oil discharge nozzle 9, squeezing the second plugging head 17, the first piston 16 and the piston rod 8 to contract. At this time, the rod chamber of the hydraulic cylinder is filled with hydraulic oil, and the hydraulic oil in the rodless chamber will flow back to the hydraulic system through the oil inlet chamber 12 and the oil inlet nozzle 10. When the first plugging head 15 at the other end of the first piston 16 blocks the first plugging hole 34, the flow path of the hydraulic oil is turned from the large-aperture first plugging hole 34 to the small-aperture first buffer hole 20, and flows into the oil inlet chamber 12 along the buffer chamber 21 and the second buffer hole 14, forcing the hydraulic oil to be squeezed out through the small hole, generating greater resistance, reducing the speed of the first piston 16, and reducing the speed of the piston rod 8 when it approaches the minimum stroke, thereby ensuring the operating stability of the starting point of the long-stroke hydraulic cylinder;

[0053] Moreover, during the extension and retraction process of the piston rod 8, the reinforcing seat 7 and the reinforcing rod 30 are simultaneously carried to move, so that the reinforcing rod 30 can be extended and retracted in the mounting tube 4, so that when the mounting tube 4 and the reinforcing rod 30 provide assembly performance, the six mounting tubes 4 and the six reinforcing rods 30 can also be used to ensure the operation stability of the piston rod 8 and provide supporting stress for the piston rod 8 in a 360-degree direction, thereby avoiding the problem of scratching between the piston rod 8 itself and the hydraulic cylinder as a whole when the end of the piston rod 8 is subjected to a large inclined extrusion force, thereby ensuring the overall operation stability of the hydraulic cylinder;

[0054] Moreover, when the piston rod 8 is about to reach the maximum stroke, the third piston 31 on the reinforcement rod 30 squeezes the buffer sleeve 38 in the third buffer stabilization assembly, so that the spring 39 is compressed, and the L-shaped guide plate 41 moves in the guide groove 40, so that the entire third buffer stabilization assembly contracts. At this time, the reinforcement rod 30 and the piston rod 8 are further buffered, so as to fully ensure the operation stability of the end point of the long-stroke hydraulic cylinder;

[0055] It is also possible that when the piston rod 8 is about to reach the minimum stroke, the third piston 31 gradually moves into the interior of the buffer ring 35, reducing the aperture of the hydraulic oil flowing through the buffer ring 35, and reducing the running speed of the reinforcement rod 30 and the third piston 31, thereby further buffering the reinforcement rod 30 and the piston rod 8 through the second buffer stabilization component, thereby fully ensuring the operating stability of the hydraulic cylinder starting point.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly stable long-stroke hydraulic cylinder, comprising a cylinder barrel (3) and a first end cover (1) and a second end cover (5) sealably arranged at both ends of the cylinder barrel (3), characterized in that: Both ends of the outer wall of the cylinder barrel (3) are fixed with mounting rings (2), and six mounting holes (32) are arranged in an annular pattern at equal distances on the two mounting rings (2) and the second end cover (5). Six mounting cylinders (4) passing through the mounting holes (32) at equal distances are fixed on one side of the first end cover (1), and one end of the outer wall of the six mounting cylinders (4) is screwed with a nut (6) affixed to the outer wall of one side of the second end cover (5). A piston rod (8) is inserted in the middle of the second end cover (5), and one end of the piston rod (8) is installed with a first piston (1) affixed to the inner wall of the cylinder barrel (3). 6), a first buffer stabilization component is arranged at both ends of the first piston (16) and inside the first end cover (1) and the second end cover (5), a reinforcement seat (7) is fixedly installed at one end of the piston rod (8) close to the outer wall of the second end cover (5), and a reinforcement rod (30) is fixed on one side of the reinforcement seat (7) and is inserted into six installation tubes (4) at equal distances, wherein three of the reinforcement rods (30) are arranged at one end close to the first end cover (1) with a second buffer stabilization component, and three of the installation tubes (4) are arranged at one side close to the inner wall of the second end cover (5) with a third buffer stabilization component.

2. A highly stable long-stroke hydraulic cylinder according to claim 1, characterized in that: An oil inlet chamber (12) is provided in the middle of the first end cover (1), and an oil inlet nozzle (10) extending out of the first end cover (1) is provided on the oil inlet chamber (12); a first blocking hole (34) communicating with the cylinder barrel (3) is provided in the middle of one end of the oil inlet chamber (12), and an ear seat (11) is fixed in the middle of the other side of the first end cover (1).

3. A highly stable long-stroke hydraulic cylinder according to claim 2, characterized in that: An oil drain chamber (19) is provided in the middle of the second end cover (5), and an oil drain nozzle (9) extending from the second end cover (5) is provided on the oil drain chamber (19); a second blocking hole (18) communicating with the cylinder barrel (3) is provided in the middle of one end of the oil drain chamber (19); a through hole (36) and a groove (37) are provided in sequence in the middle of the other end of the oil drain chamber (19); the piston rod (8) passes through the second blocking hole (18), the through hole (36) and the groove (37); and a sealing device is provided inside the groove (37).

4. A highly stable long-stroke hydraulic cylinder according to claim 3, characterized in that: The sealing device comprises a key (28) which is interference-fitted on the inner wall of the slot (37), and a bushing (26) is interference-fitted at the middle position of the inner wall of the key (28), one end of the bushing (26) and one end of the inner wall of the key (28) are provided with a dust ring (27), and the other end of the bushing (26) and the other end of the inner wall of the key (28) are provided with a sealing ring (25), and the dust ring (27) and the sealing ring (25) are both attached to the surface of the piston rod (8).

5. A highly stable long-stroke hydraulic cylinder according to claim 4, characterized in that: The first buffer stabilization component comprises a buffer cavity (21) provided on the first end cover (1) and the second end cover (5), and a second buffer hole (14) communicating with the oil inlet cavity (12) and the oil discharge cavity (19) is provided at one end of the top of the buffer cavity (21), and a first buffer hole (20) communicating with the cylinder barrel (3) is provided at the other end of the top of the buffer cavity (21); the inner diameters of the first buffer hole (20) and the second buffer hole (14) are both smaller than the inner diameters of the first blocking hole (34) and the second blocking hole (18); a first blocking head (15) and a second blocking head (17) for blocking the first blocking hole (34) and the second blocking hole (18) are fixed at the middle positions of both ends of the first piston (16); the lengths of the first blocking head (15) and the second blocking head (17) are both greater than the lengths of the first blocking hole (34) and the second blocking hole (18); and a volume adjustment component is provided at the bottom of the buffer cavity (21).

6. A highly stable long-stroke hydraulic cylinder according to claim 5, characterized in that: The volume adjustment assembly comprises a threaded hole (33) formed at the bottom of the two buffer chambers (21), and an adjustment groove (24) is formed at the bottom of each threaded hole (33). A threaded column (23) is screwed onto the inner wall of the threaded hole (33), and the bottom of the threaded column (23) is arranged inside the adjustment groove (24). A second piston (22) is mounted on the top of each threaded column (23) and is attached to the inner wall of the buffer chamber (21).

7. A highly stable long-stroke hydraulic cylinder according to claim 1, characterized in that: The second buffer stabilization component comprises a buffer ring (35) fixed to the other end of the inner wall of three of the mounting cylinders (4), and the third piston (31) is mounted on one end of the three reinforcement rods (30) close to the first end cover (1) and is fitted to the inner wall of the mounting cylinder (4), one side of the outer wall of the third piston (31) is fitted to the inner wall of the buffer ring (35), one side of the inner wall of the buffer ring (35) is designed to be truncated, and the other side of the inner wall of the buffer ring (35) is designed to be pore-shaped, and three L-shaped flow channels (13) for connecting the interior of the oil inlet chamber (12) and the interior of the buffer ring (35) are opened in the first end cover (1).

8. The high stability long stroke hydraulic cylinder according to claim 1, characterized in that: A ball sleeve (29) is fixed to one end of the inner wall of the installation tube (4) close to the second end cover (5), and the reinforcement rod (30) is fitted on the inner wall of the ball sleeve (29).

9. A highly stable long-stroke hydraulic cylinder according to claim 8, characterized in that: The third buffer stabilization component comprises a spring (39) fixed to one end of three ball sleeves (29), and a buffer sleeve (38) sleeved on the outer wall of the reinforcement rod (30) is fixed to one end of the spring (39), the inner diameter of the buffer sleeve (38) is larger than the outer diameter of the reinforcement rod (30), and L-shaped guide plates (41) are fixed to the top and bottom of one side of the buffer sleeve (38) close to the ball sleeve (29), and two guide grooves (40) are provided on the inner wall of the mounting tube (4) for inserting one end of the two L-shaped guide plates (41).

10. The high stability long stroke hydraulic cylinder according to claim 1, characterized in that: The angle between the three second buffer stabilizing components and the three third buffer stabilizing components is 120°, and the cross-sections of the first end cover (1), the two mounting rings (2), the second end cover (5) and the reinforcement seat (7) are all designed to be hexagonal plum blossom shapes.

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