A highly stable long-stroke hydraulic cylinder

Abstract

This invention relates to the field of hydraulic cylinder technology, specifically disclosing a highly stable long-stroke hydraulic cylinder, comprising a cylinder barrel and a first end cap and a second end cap sealed at both ends of the cylinder barrel. Mounting rings are fixed to both ends of the outer wall of the cylinder barrel, and six equally spaced, annularly distributed mounting holes are formed on both mounting rings and the second end cap. Six mounting cylinders, passing through the mounting holes at equal intervals, are fixed to one side of the first end cap. Nuts, fitting against one side of the outer wall of each of the six mounting cylinders, are screwed to one end of the outer wall of the second end cap. A piston rod is inserted through the middle of the second end cap. This invention utilizes six mounting cylinders and six reinforcing rods to ensure the operational stability of the piston rod and to provide supporting stress to the piston rod in a 360-degree direction, preventing the piston rod end from scraping against the hydraulic cylinder body when subjected to large tilting compressive forces, thus ensuring the overall operational stability of the hydraulic cylinder and improving its service life.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder technology, and more specifically, to a highly stable long-stroke hydraulic cylinder. Background Technology

[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 longer stroke. A long-stroke hydraulic cylinder consists of a cylinder barrel, piston rod, and piston, and its extension and retraction are achieved by controlling the flow of liquid. The advantages of long-stroke hydraulic cylinders over ordinary cylinders are mainly reflected in the following aspects: a larger stroke range, a larger working torque, and precise positioning control. In the field of construction machinery, long-stroke hydraulic cylinders are widely used in various large-scale equipment, such as bulldozers, loaders, and excavators, which require large strokes and large working torques. Long-stroke hydraulic cylinders provide stable force support, enabling the equipment to complete its work tasks smoothly. In construction engineering, 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 retracted, which requires long-stroke hydraulic cylinders to provide long-distance strokes and high-precision positioning capabilities.

[0003] A search revealed a stabilizing hydraulic cylinder with publication number CN202628672U. The cylinder includes a cylinder body containing a piston and piston rod, which are fixedly connected. A cylinder head and cylinder tail are fixed to both ends of the cylinder body. A venting device is installed on the cylinder body and communicates with the inner cavity of the cylinder. A guide sleeve is provided between the cylinder head and piston rod, and the guide sleeve has several oil outlet channels. This stabilizing hydraulic cylinder features a simple structure due to the venting device on the cylinder body, simplifying the oil circuit and facilitating maintenance. Furthermore, the guide sleeve with several oil outlet channels allows for timely discharge of compressed high-pressure oil and gas as the piston rod slides relative to the guide sleeve, thereby reducing piston rod speed fluctuations and significantly improving the stability of the hydraulic cylinder's operation.

[0004] Based on the aforementioned patents, the existing technology has the following shortcomings: When the piston rod of the hydraulic cylinder in the existing technology is subjected to a large tilting and compressive force after extending or retracting a certain length, it will cause the piston rod to tilt, resulting in scraping between the piston rod and the hydraulic cylinder. This causes instability of the hydraulic cylinder and may even cause it to tip over, reducing the service life of the hydraulic cylinder. Therefore, there is an urgent need for a highly stable long-stroke hydraulic cylinder to solve the above problems. Summary of the Invention

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

[0006] The technical solution of this invention is implemented as follows:

[0007] A highly stable long-stroke hydraulic cylinder includes a cylinder barrel and a first end cap and a second end cap sealed at both ends of the cylinder barrel. Mounting rings are fixed to both ends of the outer wall of the cylinder barrel, and six equally spaced, annularly distributed mounting holes are provided on both mounting rings and the second end cap. Six mounting cylinders, passing through the mounting holes at equal intervals, are fixed to one side of the first end cap. Nuts fitted to the outer wall of one side of the second end cap are screwed to one end of the outer wall of each of the six mounting cylinders. A piston rod is inserted through the middle of the second end cap, and a first piston fitted to the inner wall of the cylinder barrel is mounted at one end of the piston rod. First buffer stabilizing components are provided at both ends of the first piston and inside the first and second end caps. A reinforcing seat is fixed to the end of the piston rod near the outer wall of the second end cap, and reinforcing rods, equally spaced and inserted into the six mounting cylinders, are fixed to one side of the reinforcing seat. Three of the reinforcing rods near the first end cap are provided with second buffer stabilizing components, and three of the mounting cylinders near the inner wall of the second end cap are provided with third buffer stabilizing components.

[0008] Furthermore, an oil inlet chamber is provided in the middle of the interior of the first end cover, and an oil inlet nozzle extending out of the first end cover is provided on the oil inlet chamber. A first sealing hole communicating with the cylinder is provided in the middle of one end of the oil inlet chamber, and an ear seat is fixed in the middle of the other side of the first end cover.

[0009] Furthermore, an oil drain chamber is provided in the middle of the interior of the second end cover, and an oil drain nozzle extending out of the second end cover is provided on the oil drain chamber. A second sealing hole communicating with the cylinder is provided in the middle of one end of the oil drain chamber, and a through hole and a slot are provided in sequence in the middle 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-fitted to the inner wall of the slot, and a bushing is interference-fitted to the middle of the inner wall of the key. A dustproof ring is provided at one end of the bushing and at one end of the inner wall of the key, and a sealing ring is provided at the other end of the bushing and at the other end of the inner wall of the key. Both the dustproof ring and the sealing ring are attached to the surface of the piston rod.

[0011] Furthermore, the first buffer stabilizing assembly includes buffer cavities formed on the first end cover and the second end cover, and each buffer cavity has a second buffer hole at one top end that communicates with the oil inlet cavity and the oil outlet cavity, and a first buffer hole at the other top end that communicates with the cylinder. The inner diameters of the first buffer hole and the second buffer hole are both smaller than the inner diameters of the first sealing hole and the second sealing hole. A first sealing head and a second sealing head for sealing the first sealing hole and the second sealing hole are fixed at the middle positions of both ends of the first piston. The lengths of the first sealing head and the second sealing head are both greater than the lengths of the first sealing hole and the second sealing hole. A volume adjustment assembly is provided at the bottom of each buffer cavity.

[0012] Furthermore, the volume adjustment assembly includes threaded holes at the bottom of the two buffer chambers, and each threaded hole has an adjustment groove at its bottom. A threaded post is screwed into the inner wall of the threaded hole, the bottom of the threaded post is located inside the adjustment groove, and a second piston is installed on the top of each threaded post, which fits against the inner wall of the buffer chamber.

[0013] Furthermore, the second buffer stabilizing assembly includes a buffer ring fixed to the other end of the inner wall of one of the three mounting cylinders, and each of the three reinforcing rods near the end of the first end cap is fitted 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 as a frustum, and the other side of the inner wall of the buffer ring is designed as a fine hole. The first end cap has three L-shaped flow channels for connecting the inside of the oil inlet chamber and the inside of the buffer ring.

[0014] Furthermore, a ball sleeve is fixed to one end of the mounting cylinder near the inner wall of the second end cap, and a reinforcing rod is attached to the inner wall of the ball sleeve.

[0015] Furthermore, the third buffer stabilizing component includes springs fixed to one end of three ball sleeves, and one end of each spring is fixed with a buffer sleeve sleeved on the outer wall of the reinforcing rod. The inner diameter of the buffer sleeve is larger than the outer diameter of the reinforcing rod. L-shaped guide plates are fixed to the top and bottom of the side of the buffer sleeve near the ball sleeve. The inner wall of the mounting cylinder is provided with two guide grooves for inserting one end of the two L-shaped guide plates.

[0016] Furthermore, the included angle between each of the three second buffer stabilizing components and the three third buffer stabilizing components is 120°, and the cross-sections of the first end cap, the two mounting rings, the second end cap, and the reinforcing base are all designed in a hexagonal quincunx shape.

[0017] The beneficial effects of this invention are:

[0018] 1. The present invention provides a highly stable long-stroke hydraulic cylinder, which, through the arrangement of a first end cap, cylinder barrel, second end cap, piston rod, first piston, first buffer stabilization component, and volume adjustment component, allows the hydraulic oil to flow from the large-diameter first and second sealing holes to the small-diameter first buffer hole when the first piston moves to the first buffer stabilization component. The first sealing head is inserted and seals the first sealing hole, and the second sealing head is inserted and seals the second sealing hole. The hydraulic oil then flows along the buffer chamber and the second buffer hole into the oil inlet chamber and oil outlet chamber, forcing the hydraulic oil to be squeezed out through the small hole, generating greater resistance. This forces the speed of the first piston to decrease, causing the piston rod to slow down when approaching its maximum and minimum stroke. This ensures the operational stability of the long-stroke hydraulic cylinder at both the beginning and end points, avoids cylinder collisions and noise, and prevents impact on piston movement accuracy or even damage to the piston. Furthermore, the volume adjustment component allows the volume of the buffer chamber to be adjusted, enabling the hydraulic oil to flow in buffer chambers of different volumes. The friction between the hydraulic oil and the inner wall of the buffer chamber further buffers the hydraulic oil, further ensuring the stability of the hydraulic cylinder at its beginning and end points.

[0019] 2. The present invention provides a highly stable long-stroke hydraulic cylinder. Through the arrangement of a first end cap, mounting ring, cylinder barrel, second end cap, mounting hole, mounting cylinder, nut, reinforcing seat, piston rod, ball sleeve, and reinforcing rod, the first end cap, mounting ring, cylinder barrel, and second end cap can be assembled as a whole under the cooperation of the mounting cylinder, mounting hole, and nut. During the extension and retraction of the piston rod, the reinforcing seat and reinforcing rod move synchronously, allowing the reinforcing rod to extend and retract within the mounting cylinder. This provides assembly performance through the mounting cylinder and reinforcing rod, while also ensuring the operational stability of the piston rod and providing support stress in the 360-degree direction using six mounting cylinders and six reinforcing rods. This prevents the piston rod end from scraping against the hydraulic cylinder when subjected to large tilting compressive forces, ensuring the overall operational stability of the hydraulic cylinder, preventing tipping and overturning, and improving the service life of the hydraulic cylinder.

[0020] 3. The present invention provides a highly stable long-stroke hydraulic cylinder. Through the arrangement of a first end cap, mounting cylinder, second buffer stabilizing component, reinforcing rod, ball sleeve, and third buffer stabilizing component, when the piston rod is about to reach its maximum stroke, the third piston on the reinforcing rod squeezes the third buffer stabilizing component to contract. Alternatively, when the piston rod is about to reach its minimum stroke, the third piston reduces the orifice diameter of the hydraulic oil flowing through the buffer ring, thereby reducing the running speed of the reinforcing rod and the third piston. Thus, the second and third buffer stabilizing components, in conjunction with the first buffer stabilizing component, provide further buffer stabilization, ensuring the stable operation of the hydraulic cylinder. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of a highly stable long-stroke hydraulic cylinder according to the present invention.

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

[0024] Figure 3 This invention provides a highly stable long-stroke hydraulic cylinder. Figure 2 Enlarged diagram of point A in the middle.

[0025] Figure 4 This invention provides a highly stable long-stroke hydraulic cylinder. Figure 2 Enlarged diagram of point B in the middle.

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

[0027] Figure 6 This is a mid-section view of a highly stable long-stroke hydraulic cylinder according to the present invention.

[0028] Figure 7 This is a schematic diagram of the first end cap and mounting cylinder structure of a highly stable long-stroke hydraulic cylinder according to the present invention.

[0029] Figure 8 This is a schematic diagram of the mounting ring and mounting hole structure of a highly stable long-stroke hydraulic cylinder according to the present invention.

[0030] Figure 9 This is a cross-sectional view of the first end cap, the second end cap, and the mounting cylinder of a highly stable long-stroke hydraulic cylinder according to the present invention.

[0031] Figure 10 This invention provides a highly stable long-stroke hydraulic cylinder. Figure 9 Enlarged diagram of point C in the middle.

[0032] Figure 11 This invention provides a highly stable long-stroke hydraulic cylinder. Figure 9 Enlarged diagram of point D in the middle.

[0033] Figure 12 This is a schematic diagram of the buffer ring and L-shaped guide plate structure of a highly stable long-stroke hydraulic cylinder according to the present invention.

[0034] Figure 13 This is a cross-sectional view of the first end cap of a highly stable long-stroke hydraulic cylinder according to the present invention.

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

[0036] Figure 15 This is a cross-sectional view of the second end cap of a highly stable long-stroke hydraulic cylinder according to the present invention.

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

[0038] In the picture:

[0039] 1. First end cap; 2. Mounting ring; 3. Cylinder barrel; 4. Mounting sleeve; 5. Second end cap; 6. Nut; 7. Reinforcing seat; 8. Piston rod; 9. Drain nozzle; 10. Inlet nozzle; 11. Ear seat; 12. Inlet chamber; 13. L-shaped flow channel; 14. Second buffer hole; 15. First sealing head; 16. First piston; 17. Second sealing head; 18. Second sealing hole; 19. Drain chamber; 20. First buffer hole; 21. 21. Buffer chamber; 22. Second piston; 23. Threaded column; 24. Adjustment groove; 25. Sealing ring; 26. Bushing; 27. Dustproof ring; 28. Locking key; 29. ​​Ball sleeve; 30. Reinforcing rod; 31. Third piston; 32. Mounting hole; 33. Threaded hole; 34. First sealing hole; 35. Buffer ring; 36. Through hole; 37. Locking groove; 38. Buffer sleeve; 39. Spring; 40. Guide groove; 41. L-shaped guide plate. Detailed Implementation

[0040] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0041] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0042] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] Example 1:

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

[0046] Please see Figure 1-16A highly stable long-stroke hydraulic cylinder includes a cylinder barrel 3 and a first end cover 1 and a second end cover 5 sealed at both ends of the cylinder barrel 3. Mounting rings 2 are fixed to both ends of the outer wall of the cylinder barrel 3, and six equally spaced, annularly distributed mounting holes 32 are provided on both mounting rings 2 and the second end cover 5. Six mounting cylinders 4, equally spaced and passing through the mounting holes 32, are fixed to one side of the first end cover 1. Nuts 6, which fit against the outer wall of one side of the second end cover 5, are screwed to one end of the outer wall of each of the six mounting cylinders 4. A piston rod 8 is inserted through the middle of the second end cover 5, and a first piston 16, which fits against the inner wall of the cylinder barrel 3, is mounted on one end of the piston rod 8. This allows the cylinder to perform integral rotation of the first end cover 1, mounting rings 2, cylinder barrel 3, and second end cover 5 under the combined action of the mounting cylinders 4, mounting holes 32, and nuts 6. During assembly, the reinforcing seat 7 and reinforcing rod 30 are moved synchronously during the extension and retraction of the piston rod 8, allowing the reinforcing rod 30 to extend and retract within the mounting cylinder 4. This utilizes six mounting cylinders 4 and six reinforcing rods 30 to ensure the operational stability of the piston rod 8 and provide support stress to the piston rod 8 in the 360-degree direction. This prevents the piston rod 8 from scraping against the hydraulic cylinder when subjected to large tilting pressure, ensuring the overall operational stability of the hydraulic cylinder, preventing tipping, and extending the service life of the hydraulic cylinder. An oil inlet chamber 12 is provided in the middle of the interior 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 [missing information - likely a design feature] is provided at the middle of one end of the oil inlet chamber 12. A first sealing hole 34 is connected to the cylinder 3. An ear seat 11 is fixed at the middle position on 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 out of the second end cover 5 is provided on the oil drain chamber 19. A second sealing hole 18 communicating with the cylinder 3 is opened at the middle position of one end of the oil drain chamber 19. A through hole 36 and a groove 37 are opened sequentially at the middle position of the other end of the oil drain chamber 19. The piston rod 8 passes through the second sealing hole 18, the through hole 36, and the groove 37. A sealing device is provided inside the groove 37. The sealing device includes a key 28 that is interference-fitted to the inner wall of the groove 37. A bushing 26 is interference-fitted to the middle position of the inner wall of the key 28. A dustproof ring 27 is provided 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. Both the dust ring 27 and the sealing ring 25 are attached to the surface of the piston rod 8. First buffer stabilizing components are provided at both ends of the first piston 16 and inside the first end cover 1 and the second end cover 5. A reinforcing seat 7 is fixedly installed at the end of the piston rod 8 near the outer wall of the second end cover 5. Reinforcing rods 30 are fixed at equal intervals and inserted into six mounting cylinders 4 on one side of the reinforcing seat 7. A second buffer stabilizing component is provided at the end of three of the reinforcing rods 30 near the first end cover 1. The second buffer stabilizing component includes a buffer ring 35 fixed at the other end of the inner wall of three of the mounting cylinders 4. A third piston 31 is installed at the end of three of the reinforcing rods 30 near the first end cover 1 and is attached to the inner wall of the mounting cylinder 4.One side of the outer wall of the third piston 31 is attached to the inner wall of the buffer ring 35. One side of the inner wall of the buffer ring 35 is designed as a frustum, and the other side is designed as a perforation. Three L-shaped flow channels 13 are provided inside the first end cap 1 to connect the inside of the oil inlet chamber 12 and the inside of the buffer ring 35. Three mounting cylinders 4 are each provided with a third buffer stabilizing component near the inner wall of the second end cap 5. The third buffer stabilizing component corresponds to the position of the second buffer stabilizing component. A ball sleeve 29 is fixed to one end of each mounting cylinder 4 near the inner wall of the second end cap 5, and a reinforcing rod 30 is attached to the inner wall of the ball sleeve 29. The third buffer stabilizing component includes a spring 39 fixed to one end of one of the three ball sleeves 29. A buffer sleeve 38 is fixed to one end of the reinforcing rod 30 and fitted onto the outer wall of the reinforcing rod 30. The inner diameter of the buffer sleeve 38 is larger than the outer diameter of the reinforcing rod 30. L-shaped guide plates 41 are fixed to the top and bottom of the buffer sleeve 38 near the ball sleeve 29. Two guide grooves 40 are provided on the inner wall of the mounting cylinder 4 for inserting one end of each L-shaped guide plate 41. When the piston rod 8 is about to reach its maximum stroke, the third buffer stabilizing component further buffers the reinforcing rod 30 and piston rod 8, ensuring the operational stability of the long-stroke hydraulic cylinder at its end point. Similarly, when the piston rod 8 is about to reach its minimum stroke, the second buffer stabilizing component further buffers the reinforcing rod 30 and piston rod 8, ensuring the operational stability of the hydraulic cylinder at its starting point.

[0047] Specifically, the first buffer stabilizing assembly includes buffer cavities 21 formed on the first end cover 1 and the second end cover 5. Each buffer cavity 21 has a second buffer hole 14 at one top end communicating with the oil inlet cavity 12 and the oil outlet cavity 19. The other top end of each buffer cavity 21 has a first buffer hole 20 communicating with the cylinder 3. 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 sealing hole 34 and the second sealing hole 18. At the midpoint of both ends of the first piston 16, a first sealing head 15 and a second sealing head 17 are fixed for sealing the first sealing hole 34 and the second sealing hole 18. The lengths of the first sealing head 15 and the second sealing head 17 are both greater than the lengths of the first sealing hole 34 and the second sealing hole 18. Figure 2 , Figure 3 , Figure 4 , Figure 9 , Figure 10 , Figure 13 , Figure 14 , Figure 15 and Figure 16As shown, using the aforementioned first buffer stabilizing component, when the first piston 16 moves to the first buffer stabilizing component, the first sealing head 15 is inserted and seals the first sealing hole 34, and the second sealing head 17 is inserted and seals the second sealing hole 18. At this time, the flow path of the hydraulic oil changes from the large-diameter first sealing hole 34 and the second sealing hole 18 to the small-diameter first buffer hole 20, and flows into the oil inlet chamber 12 and the oil outlet 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. 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 it approaches the maximum stroke and the minimum stroke, which fully ensures the running stability of the long stroke hydraulic cylinder at the beginning and end points, avoids cylinder collision and noise, and prevents the piston movement accuracy from being affected or even damaged.

[0048] Specifically, the included 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 cap 1, the two mounting rings 2, the second end cap 5 and the reinforcing base 7 are all designed in a hexagonal quincunx shape.

[0049] Example 2:

[0050] Please see Figure 4 , Figure 9 , Figure 10 , Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, compared to Embodiment 1, this embodiment has a volume adjustment component at the bottom of each buffer chamber 21. The volume adjustment component includes threaded holes 33 at the bottom of the two buffer chambers 21, and each threaded hole 33 has an adjustment groove 24 at its bottom. A threaded post 23 is screwed into the inner wall of the threaded hole 33, and the bottom of the threaded post 23 is located inside the adjustment groove 24. A second piston 22 is installed on the top of each threaded post 23 and fits against the inner wall of the buffer chamber 21. By using the above-mentioned volume adjustment component, the volume of the buffer chamber 21 can be adjusted, the friction of the hydraulic oil flowing in the buffer chamber 21 can be changed, and the buffering performance of the entire hydraulic cylinder can be changed.

[0051] In summary, with the help of the above-mentioned technical solution of the present invention, the working principle of the present invention is as follows: When the entire hydraulic cylinder extends, the hydraulic oil in the hydraulic system enters the oil inlet chamber 12 through the oil inlet nozzle 10, which squeezes the first sealing 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 into the hydraulic system through the oil outlet chamber 19 and the oil outlet nozzle 9. When the second sealing head 17 at one end of the first piston 16 blocks the second sealing hole 18, the flow path of the hydraulic oil changes from the large-diameter second sealing hole 18 to the small-diameter first buffer hole 20, and flows into the oil outlet 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, so that the speed of the piston rod 8 decreases when it approaches the maximum stroke, ensuring the operational stability of the long-stroke hydraulic cylinder at the end point.

[0052] When the hydraulic cylinder retracts, the hydraulic oil in the hydraulic system enters the drain chamber 19 through the drain nozzle 9, squeezing the second plug head 17, the first piston 16 and the piston rod 8 to retract. 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 into the hydraulic system through the inlet chamber 12 and the inlet nozzle 10. When the first plug head 15 at the other end of the first piston 16 blocks the first plug hole 34, the flow path of the hydraulic oil changes from the large-diameter first plug hole 34 to the small-diameter first buffer hole 20, and flows into the 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, so that the speed of the piston rod 8 decreases when it approaches the minimum stroke, ensuring the running stability of the long stroke hydraulic cylinder at the beginning.

[0053] Furthermore, during the extension and retraction of the piston rod 8, the reinforcing seat 7 and the reinforcing rod 30 move simultaneously, allowing the reinforcing rod 30 to extend and retract within the mounting cylinder 4. This enables the mounting cylinder 4 and the reinforcing rod 30 to provide assembly performance, while also ensuring the operational stability of the piston rod 8 and providing support stress for the piston rod 8 in the 360-degree direction using six mounting cylinders 4 and six reinforcing rods 30. This prevents the piston rod 8 from scraping against the hydraulic cylinder when the end of the piston rod 8 is subjected to large tilting extrusion forces, thus ensuring the overall operational stability of the hydraulic cylinder.

[0054] Moreover, when the piston rod 8 is about to reach its maximum stroke, the third piston 31 on the reinforcing rod 30 presses the buffer sleeve 38 in the third buffer stabilizing assembly, which compresses the spring 39 and causes the L-shaped guide plate 41 to move in the guide groove 40, causing the entire third buffer stabilizing assembly to contract. At this time, the reinforcing rod 30 and the piston rod 8 are further buffered, which fully ensures the operational stability of the long stroke hydraulic cylinder at the end point.

[0055] It can also gradually move the third piston 31 into the interior of the buffer ring 35 when the piston rod 8 is about to reach the minimum stroke, reduce the diameter of the hydraulic oil flowing through the buffer ring 35, and reduce the running speed of the reinforcing rod 30 and the third piston 31. Thus, the second buffer stabilizing component can further buffer the reinforcing rod 30 and the piston rod 8, and fully ensure the running stability of the hydraulic cylinder at the 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-stability long-stroke hydraulic cylinder comprising a cylinder barrel (3) and a first end cover (1) and a second end cover (5) sealingly arranged at both ends of the cylinder barrel (3), characterized in that, The outer wall of the cylinder (3) is fixed with mounting ring (2) at both ends, and six equidistant mounting holes (32) are arranged on the two mounting rings (2) and the second end cover (5) in a ring shape, one side of the first end cover (1) is fixed with six mounting barrels (4) passing through the mounting holes (32) at equal distances, one end of the outer wall of the six mounting barrels (4) is screwed with a nut (6) fitted on one side of the outer wall of the second end cover (5), the middle position of the second end cover (5) is inserted with a piston rod (8), the middle position of the inside of the first end cover (1) is provided with an oil inlet cavity (12), and the oil inlet cavity (12) is provided with an oil inlet nozzle (10) extending out of the first end cover (1), one end of the oil inlet cavity (12) is provided with a first blocking hole (34) communicated with the cylinder (3), the other side of the first end cover (1) is fixed with an ear seat (11) at the middle position, the inside of the second end cover (5) is provided with an oil discharge cavity (19) at the middle position, and the oil discharge cavity (19) is provided with an oil discharge nozzle (9) extending out of the second end cover (5), one end of the oil discharge cavity (19) is provided with a second blocking hole (18) communicated with the cylinder (3), the other end of the oil discharge cavity (19) is sequentially provided with a through hole (36) and a clamping groove (37), the piston rod (8) passes through the second blocking hole (18), the through hole (36) and the clamping groove (37), and one end of the piston rod (8) is provided with a first piston (16) fitted on the inner wall of the cylinder (3), the two ends of the first piston (16) are provided with a first buffer stabilizing assembly in the first end cover (1) and the second end cover (5), the first buffer stabilizing assembly comprises a buffer cavity (21) arranged on the first end cover (1) and the second end cover (5), and the top of the buffer cavity (21) is provided with a second buffer hole (14) communicated with the oil inlet cavity (12) and the oil discharge cavity (19) at one end, the top of the buffer cavity (21) is provided with a first buffer hole (20) communicated with the cylinder (3) at the other end, 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 middle positions of the two ends of the first piston (16) are fixed with a first blocking head (15) and a second blocking head (17) for blocking the first blocking hole (34) and the second blocking hole (18), 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), the bottoms of the buffer cavities (21) are provided with volume adjusting assemblies, one end of the piston rod (8) is fixedly installed with a reinforcing seat (7) close to the outer wall of the second end cover (5), and the reinforcing seat (7) is fixed with reinforcing rods (30) inserted into six mounting barrels (4) at equal distances on one side, three reinforcing rods (30) close to one end of the first end cover (1) are provided with a second buffer stabilizing assembly, the second buffer stabilizing assembly comprises a buffer ring (35) fixed on the other end of the inner wall of the three mounting barrels (4),And the inner wall of the mounting cylinder (4) near the second end cover (5) is fixed with a ball sleeve (29), and the inner wall of the ball sleeve (29) is attached to the reinforcing rod (30), and the inner wall of the ball sleeve (29) is attached to the reinforcing rod (30). Three reinforcing rods (30) are installed on the inner wall of the mounting cylinder (4) near the first end cover (1), and the third piston (31) is attached to the inner wall of the mounting cylinder (4). The outer wall of the third piston (31) is attached to the inner wall of the buffer ring (35), and the inner wall of the buffer ring (35) is designed as a circular table. The inner wall of the buffer ring (35) is designed as a hole, and the part of the third piston (31) attached to the inner wall of the buffer ring (35) is designed as a cylinder. The left side of the third piston (31) connected to the cylinder is designed as a circular table that can cooperate with the circular table of the buffer ring (35). The left end of the circular table of the third piston (31) is also provided with a hole that cooperates with the hole of the buffer ring (35). Three L-shaped flow channels (13) are provided in the first end cover (1) for communication between the inside of the oil inlet chamber (12) and the inside of the buffer ring (35). Three mounting cylinders (4) are provided on the inner wall of the second end cover (5), and the third buffer stabilizing assembly is provided on the inner wall of the second end cover (5). The third buffer stabilizing assembly includes a spring (39) fixed to one end of the three ball sleeves (29), and one end of the spring (39) is fixed with a buffer sleeve (38) sleeved on the outer wall of the reinforcing rod (30). The inner diameter of the buffer sleeve (38) is greater than the outer diameter of the reinforcing rod (30), and the top and bottom of the buffer sleeve (38) near the ball sleeve (29) are fixed with L-shaped guide plates (41). The inner wall of the mounting cylinder (4) is provided with two guide grooves (40) for inserting one end of the two L-shaped guide plates (41). The inside of the clamping groove (37) is provided with a sealing device, and the sealing device includes a clamping key (28) interference fitted in the inner wall of the clamping groove (37). The inner wall of the clamping key (28) is interference fitted with a bushing (26) at the middle position. One end of the bushing (26) and the inner wall of the clamping key (28) are provided with a dustproof ring (27). The other end of the bushing (26) and the other end of the inner wall of the clamping key (28) are provided with a sealing ring (25). The dustproof ring (27) and the sealing ring (25) are attached to the surface of the piston rod (8). During the extension and retraction of the piston rod (8), the reinforcing seat (7) and the reinforcing rod (30) are simultaneously carried and moved, so that the reinforcing rod (30) is retracted in the mounting cylinder (4). When the piston rod (8) reaches the maximum stroke, the third piston (31) on the reinforcing rod (30) extrudes the buffer sleeve (38) in the third buffer stabilizing 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 stabilizing assembly is retracted. When the piston rod (8) reaches the minimum stroke, the third piston (31) gradually moves into the inside of the buffer ring (35), reducing the orifice diameter of the buffer ring (35) through which the hydraulic oil flows, and reducing the running speed of the reinforcing rod (30) and the third piston (31).

2. A high-stability long-stroke hydraulic cylinder according to claim 1, characterized in that, The volume adjusting assembly comprises threaded holes (33) formed in the bottoms of the two buffer cavities (21), the bottoms of the threaded holes (33) are provided with adjusting grooves (24), the inner walls of the threaded holes (33) are screwed with threaded columns (23), the bottoms of the threaded columns (23) are arranged in the adjusting grooves (24), and the tops of the threaded columns (23) are all provided with second pistons (22) abutting against the inner walls of the buffer cavities (21).

3. A high-stability long-stroke hydraulic cylinder according to claim 2, characterized in that, The included angles between the three second buffer stabilizing assemblies and the three third buffer stabilizing assemblies are 120°, and the cross sections of the first end cover (1), the two mounting rings (2), the second end cover (5) and the reinforcing seat (7) are all designed as hexagonal plum blossom shapes.

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