Hydraulic cylinder with a buffering function

Abstract

The application discloses a hydraulic cylinder with a buffering function, and relates to the technical field of hydraulic cylinder equipment, which comprises a cylinder barrel, a cylinder top cover, a cylinder bottom cover and a piston plate, the surface of the piston plate is provided with a piston rod, the surface of the cylinder bottom cover is further provided with a buffer chamber, the buffer chamber is provided with a first communication groove, the cylinder bottom cover is provided with a fastener, the piston plate is provided with a first buffer mechanism, and the cylinder bottom cover is provided with a second buffer mechanism. The first buffer mechanism is arranged, the buffering boss gradually enters the buffer chamber in the return process of the hydraulic cylinder, the gap between the buffering boss and the buffer chamber is gradually reduced, the oil discharge resistance of the hydraulic cylinder is gradually increased, the weak-to-medium-to-strong progressive buffering is realized, the inertial kinetic energy of the piston plate is gradually absorbed, and the piston plate and the cylinder bottom cover are prevented from being subjected to violent impact, so that the impact effect at the end of the return stroke of the hydraulic cylinder is greatly relieved, the impact noise is effectively reduced, and the service life of the hydraulic cylinder is prolonged to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder equipment technology, and in particular to a hydraulic cylinder with a buffer function. Background Technology

[0002] Hydraulic cylinders, as key actuators that convert hydraulic energy into mechanical energy, are widely used in engineering machinery, metallurgical equipment, machine tools, and other fields. Their operational stability directly affects the working accuracy and service life of the entire machine. During the operation of a hydraulic cylinder, the relative movement between the piston plate and the cylinder bottom cover at the end of the return stroke can easily generate impacts due to inertia. These impacts not only produce harsh noises but also accelerate component wear and shorten the service life of the hydraulic cylinder.

[0003] Currently, commonly available hydraulic cylinders suffer from significant deficiencies in their cushioning design. Existing hydraulic cylinders often employ a single gap or fixed throttling method for cushioning, resulting in a rather harsh cushioning effect. During the return stroke, the sudden increase in oil discharge resistance as the piston plate approaches the cylinder bottom cover causes an instantaneous increase in cushioning force, making gradual kinetic energy absorption difficult. This "hard impact" leads to a violent collision between the piston plate and the cylinder bottom cover. Over time, the contact surfaces of these surfaces are prone to deformation and cracking, potentially causing hydraulic cylinder leaks and seal failures. Furthermore, the high-frequency noise generated by the violent impact pollutes the working environment and affects the physical and mental health of operators. In the field of precision machinery, the vibration caused by the impact can also affect the machining accuracy of equipment and reduce product quality. As industrial equipment demands increasing operational stability and durability, the cushioning deficiencies of traditional hydraulic cylinders can no longer meet practical needs, thus requiring urgent improvement. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a hydraulic cylinder with a buffer function, which aims to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a hydraulic cylinder with a buffer function, comprising a cylinder barrel, a cylinder top cover, a cylinder bottom cover, and a piston plate. The cylinder barrel is fixedly disposed between the cylinder top cover and the cylinder bottom cover. The piston plate is slidably disposed within the cylinder barrel. A piston rod penetrating the cylinder top cover is fixedly disposed on the surface of the piston plate near the cylinder top cover. The piston rod is slidably connected to the cylinder top cover. A groove is formed on the opposite side surface of the cylinder top cover and the cylinder bottom cover. A first inlet and outlet communicating with the groove is formed on the cylinder top cover. A slot is formed on the opposite side surface of the cylinder bottom cover and the cylinder top cover. The slot has an annular groove on its surface away from the piston plate, and a limiting groove is formed in the annular groove. The cylinder bottom cover has multiple evenly distributed buffer chambers on its surface with the slot, and a first connecting groove communicating with the slot is formed in each buffer chamber. The cylinder bottom cover has an adjustment groove on its surface away from the cylinder top cover, and the axis of the adjustment groove coincides with the axis of the slot. The cylinder bottom cover has a second inlet and outlet communicating with the slot. Fasteners are provided on the cylinder bottom cover. A first buffer mechanism is provided on the surface of the piston plate near the cylinder bottom cover. A second buffer mechanism is provided on the cylinder bottom cover.

[0006] Preferably, the fastener comprises:

[0007] There are four fastening rods, and the two ends of the four fastening rods pass through the top cover and bottom cover of the cylinder respectively, and the ends of the fastening rods are threaded.

[0008] Nuts are placed at both ends of the fastening rod, and the nuts are threadedly connected to the ends of the fastening rod.

[0009] Preferably, the buffer chamber is formed by connecting a primary buffer chamber, a secondary buffer chamber, and a tertiary buffer chamber, and the inner diameters of the primary buffer chamber, the secondary buffer chamber, and the tertiary buffer chamber decrease progressively. The tertiary buffer chamber is connected to the slot through a first connecting groove.

[0010] Preferably, the first buffer mechanism includes:

[0011] The buffer boss has multiple buffer bosses, which are evenly distributed on the surface of the piston plate near the cylinder bottom cover, and the buffer bosses are fixedly connected to the piston plate. The number of buffer bosses is equal to the number of buffer chambers.

[0012] The insert is fixedly mounted on the surface of the piston plate near the cylinder bottom cover, and the axis of the insert coincides with the axis of the slot.

[0013] Preferably, the buffer boss is formed by sequentially and fixedly connecting a primary buffer platform, a secondary buffer platform, and a tertiary buffer platform, and the outer diameters of the primary buffer platform, the secondary buffer platform, and the tertiary buffer platform are respectively adapted to the inner diameters of the primary buffer cavity, the secondary buffer cavity, and the tertiary buffer cavity.

[0014] Preferably, the surface of the insert near the slot has a through cavity, the surface of the insert with the through cavity has a plurality of evenly distributed travel grooves, and the surface of the insert has a plurality of second connecting grooves for connecting the travel grooves and the through cavity.

[0015] Preferably, a bushing is fixedly provided on the surface of the piston plate near the cylinder top cover, and the axis of the bushing coincides with the axis of the piston rod. Multiple fluid passage grooves penetrating the end face of the bushing are opened on the surface of the bushing.

[0016] Preferably, the second buffer mechanism includes:

[0017] An annular plate is slidably disposed within the annular groove;

[0018] The buffer springs are multiple and evenly distributed within the annular groove, and the buffer springs are always in a compressed state.

[0019] A buffer sleeve is slidably connected to the annular groove, and the surface of the buffer sleeve near the buffer spring abuts against the buffer spring. An annular limiting block is fixedly provided on the surface of the buffer sleeve, and the annular limiting block is slidably connected to the limiting groove.

[0020] An adjusting component is provided on the cylinder bottom cover. The adjusting component is used to adjust the initial deformation of the buffer spring to buffer and adapt to the load of the hydraulic cylinder under different working conditions.

[0021] A transmission component is disposed on the cylinder bottom cover, and the transmission component cooperates with the adjustment component to adjust the initial deformation of the buffer spring.

[0022] Preferably, the transmission component includes:

[0023] The transmission rod has multiple rods, which are evenly distributed on the cylinder bottom cover. One end of the transmission rod extends into the annular groove and abuts against the annular plate. The transmission rod is slidably connected to the cylinder bottom cover.

[0024] A transmission plate is fixedly installed at the end of the transmission rod away from the cylinder top cover.

[0025] Preferably, the adjusting member includes:

[0026] A threaded sleeve is fixedly installed on the surface of the cylinder bottom cover away from the cylinder top cover, and the axis of the threaded sleeve coincides with the axis of the adjusting groove.

[0027] An adjusting screw is inserted into an adjusting groove at one end and threadedly connected to the threaded sleeve. A rotating rod that is rotatably connected to the transmission plate is fixedly connected to the end of the adjusting screw away from the adjusting groove. A push plate is fixedly installed on the rotating rod, and the push plate is always in contact with the transmission plate. An adjusting block is fixedly installed at the end of the rotating rod away from the adjusting screw, and an internal hexagonal groove is provided on the adjusting block.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] This device incorporates a first buffer mechanism, which allows the buffer boss to gradually enter the buffer chamber during the hydraulic cylinder's return stroke. This gradually reduces the gap between the buffer boss and the buffer chamber, causing the hydraulic cylinder's oil discharge resistance to gradually increase. This achieves a gradual buffering effect from weak to medium to strong, gradually absorbing the inertial kinetic energy of the piston plate and preventing a violent impact between the piston plate and the cylinder bottom cover. This greatly alleviates the impact at the end of the hydraulic cylinder's return stroke, effectively reducing impact noise and extending the service life of the hydraulic cylinder to some extent.

[0030] This device incorporates a second buffer mechanism, which further buffers the hydraulic cylinder, significantly reducing the impact at the end of the return stroke and extending its service life. Furthermore, the second buffer mechanism can flexibly adjust the cylinder's buffering capacity based on its actual load conditions, making the device suitable for different load conditions and thus expanding its applicability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of 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.

[0032] Figure 1 A three-dimensional structural schematic diagram of a hydraulic cylinder with a buffer function is shown.

[0033] Figure 2 A front view of a hydraulic cylinder with a buffer function is shown.

[0034] Figure 3 It shows Figure 2 Sectional view of AA.

[0035] Figure 4 It shows Figure 2 The right view.

[0036] Figure 5 It shows Figure 4 A cross-sectional view of BB.

[0037] Figure 6 It shows Figure 5 A magnified view of the local structure at point A in the middle.

[0038] Figure 7An exploded view of a portion of the structure of a hydraulic cylinder with a buffer function is shown.

[0039] Figure 8 A schematic diagram of the structure of a hydraulic cylinder end cover with a buffer function is shown.

[0040] Figure 9 It shows Figure 8 A sectional view.

[0041] Figure 10 It shows Figure 9 A magnified view of the local structure at point B.

[0042] Legend:

[0043] 1. Cylinder barrel; 2. Cylinder top cover; 3. Cylinder bottom cover; 4. Piston plate; 5. Piston rod; 6. Column groove; 7. First inlet / outlet; 8. Slot; 9. Annular groove; 10. Limiting groove; 11. First connecting groove; 12. Adjusting groove; 13. Second inlet / outlet; 14. Fastening rod; 15. Nut; 16. Primary buffer chamber; 17. Secondary buffer chamber; 18. Tertiary buffer chamber; 19. Insert column; 20. Primary buffer platform; 21. Secondary buffer platform; 22. Tertiary buffer platform; 23. Through cavity; 24. Stroke groove; 25. Second connecting groove; 26. Bushing; 27. Fluid passage groove; 28. Annular plate; 29. ​​Buffer spring; 30. Buffer sleeve; 31. Annular limiting block; 32. Transmission rod; 33. Transmission plate; 34. Threaded sleeve; 35. Adjusting screw; 36. Rotating rod; 37. Push plate; 38. Adjusting block; 39. Internal hexagonal groove. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be understood that the terms "length", "width", "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 invention 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 invention.

[0046] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] Reference Figures 1 to 10 An embodiment of a hydraulic cylinder with a buffer function according to the present invention will be further described.

[0049] A hydraulic cylinder with a buffer function includes a cylinder barrel 1, a cylinder top cover 2, a cylinder bottom cover 3, and a piston plate 4. The cylinder barrel 1 is fixedly disposed between the cylinder top cover 2 and the cylinder bottom cover 3. The piston plate 4 is slidably disposed inside the cylinder barrel 1. A bushing 26 is fixedly disposed on the surface of the piston plate 4 near the cylinder top cover 2, and the axis of the bushing 26 coincides with the axis of the piston rod 5. The surface of the bushing 26 has multiple fluid passage grooves 27 penetrating the end face of the bushing 26. During operation, when the hydraulic cylinder moves, the piston plate 4 and the cylinder top cover... The hydraulic oil between the piston plate 4 and the cylinder top cover 2 first exits the hydraulic cylinder through the column groove 6 and the first inlet / outlet 7. When one end of the bushing 26 enters the column groove 6, the hydraulic oil between the piston plate 4 and the cylinder top cover 2 enters the column groove 6 through the fluid passage groove 27 on the bushing 26 and then exits the hydraulic cylinder through the first inlet / outlet 7. It should be noted that after the bushing 26 enters the column groove 6, the flow area of ​​the hydraulic oil decreases, which increases the oil discharge resistance between the piston plate 4 and the cylinder top cover 2, thereby buffering the end of the hydraulic cylinder's progress.

[0050] A piston rod 5 is fixedly installed on the surface of the piston plate 4 near the cylinder top cover 2, penetrating the cylinder top cover 2. The piston rod 5 is slidably connected to the cylinder top cover 2. A column groove 6 is opened on the opposite side surface of the cylinder top cover 2 and the cylinder bottom cover 3. A first inlet and outlet 7 communicating with the column groove 6 is opened on the cylinder top cover 2. A slot 8 is opened on the opposite side surface of the cylinder bottom cover 3 and the cylinder top cover 2. An annular groove 9 is opened on the surface of the slot 8 away from the piston plate 4. A limit groove 10 is opened in the annular groove 9. A plurality of evenly distributed buffer chambers are also opened on the surface of the cylinder bottom cover 3 with the slot 8. The buffer chambers are connected by a first-level buffer chamber 16, a second-level buffer chamber 17 and a third-level buffer chamber 18. The inner diameter of the first-level buffer chamber 16, the second-level buffer chamber 17 and the third-level buffer chamber 18 decreases step by step. The third-level buffer chamber 18 is connected to the slot 8 through a first connecting groove 11.

[0051] The buffer chamber has a first communicating groove 11 communicating with the slot 8. The cylinder bottom cover 3 has an adjusting groove 12 on its surface away from the cylinder top cover 2. The axis of the adjusting groove 12 coincides with the axis of the slot 8. The cylinder bottom cover 3 has a second inlet / outlet 13 communicating with the slot 8. Fasteners are provided on the cylinder bottom cover 3, including:

[0052] There are four fastening rods 14, and the two ends of the four fastening rods 14 pass through the cylinder top cover 2 and the cylinder bottom cover 3 respectively, and the ends of the fastening rods 14 are provided with threads;

[0053] Nut 15 is provided at both ends of fastening rod 14, and nut 15 is threadedly connected to the end of fastening rod 14.

[0054] A first buffer mechanism is provided on the surface of the piston plate 4 near the cylinder bottom cover 3, and the first buffer mechanism includes:

[0055] Multiple buffer bosses are evenly distributed on the surface of the piston plate 4 near the cylinder bottom cover 3, and the buffer bosses are fixedly connected to the piston plate 4. The number of buffer bosses is equal to the number of buffer chambers. The buffer bosses are formed by sequentially and fixedly connecting a primary buffer platform 20, a secondary buffer platform 21, and a tertiary buffer platform 22. The outer diameters of the primary buffer platform 20, the secondary buffer platform 21, and the tertiary buffer platform 22 are respectively adapted to the inner diameters of the primary buffer chamber 16, the secondary buffer chamber 17, and the tertiary buffer chamber 18.

[0056] The insert post 19 is fixedly disposed on the surface of the piston plate 4 near the cylinder bottom cover 3, and the axis of the insert post 19 coincides with the axis of the slot 8. A through cavity 23 is formed on the surface of the insert post 19 near the slot 8. A plurality of evenly distributed stroke grooves 24 are formed on the surface of the insert post 19 with the through cavity 23. A plurality of second connecting grooves 25 are formed on the surface of the insert post 19 to connect the stroke grooves 24 and the through cavity 23.

[0057] During operation, when the hydraulic cylinder returns, the piston plate 4 slides towards the cylinder bottom cover 3, causing the insert post 19 and buffer boss on the piston plate 4 to slide towards the cylinder bottom cover 3. This allows the hydraulic oil between the piston plate 4 and the cylinder bottom cover 3 to be discharged from the hydraulic cylinder through the buffer chamber, the first connecting groove, the slot 8, and the second inlet / outlet 13. When the third-stage buffer platform 22 enters the first-stage buffer chamber 16, the flow area of ​​the hydraulic oil between the piston plate 4 and the cylinder bottom cover 3 entering the slot 8 through the buffer chamber decreases, thus creating a certain resistance to the return stroke of the piston plate 4. When the second-stage buffer platform 21 enters the first-stage buffer chamber 16, the flow area of ​​the hydraulic oil between the piston plate 4 and the cylinder bottom cover 3 entering the slot 8 through the buffer chamber further decreases, thus further increasing the resistance to the return stroke of the piston plate 4.

[0058] This device incorporates a first buffer mechanism, which allows the buffer boss to gradually enter the buffer chamber during the hydraulic cylinder's return stroke. This gradually reduces the gap between the buffer boss and the buffer chamber, causing the hydraulic cylinder's oil discharge resistance to gradually increase. This achieves a gradual buffering effect from weak to medium to strong, gradually absorbing the inertial kinetic energy of the piston plate 4 and preventing a violent impact between the piston plate 4 and the cylinder bottom cover 3. This greatly alleviates the impact at the end of the hydraulic cylinder's return stroke, effectively reducing impact noise and extending the service life of the hydraulic cylinder to some extent.

[0059] A second buffer mechanism is provided on the cylinder bottom cover 3, and the second buffer mechanism includes:

[0060] An annular plate 28 is slidably disposed within the annular groove 9;

[0061] There are multiple buffer springs 29, and the multiple buffer springs 29 are evenly distributed in the annular groove 9. The buffer springs 29 are always in a compressed state.

[0062] The buffer sleeve 30 is slidably connected to the annular groove 9, and the surface of the buffer sleeve 30 near the buffer spring 29 abuts against the buffer spring 29. An annular limiting block 31 is fixedly provided on the surface of the buffer sleeve 30, and the annular limiting block 31 is slidably connected to the limiting groove 10.

[0063] An adjusting component, disposed on the cylinder bottom cover 3, is used to adjust the initial deformation of the buffer spring 29 to buffer and adapt to the load of the hydraulic cylinder under different working conditions. The adjusting component includes:

[0064] A threaded sleeve 34 is fixedly installed on the surface of the cylinder bottom cover 3 away from the cylinder top cover 2, and the axis of the threaded sleeve 34 coincides with the axis of the adjusting groove 12.

[0065] An adjusting screw 35 is inserted into the adjusting groove 12 at one end and threadedly connected to the threaded sleeve 34. A rotating rod 36, which is rotatably connected to the transmission plate 33, is fixedly connected to the end of the adjusting screw 35 away from the adjusting groove 12. A push plate 37 is fixedly provided on the rotating rod 36. The push plate 37 is always in contact with the transmission plate 33. An adjusting block 38 is fixedly provided on the end of the rotating rod 36 away from the adjusting screw 35. An internal hexagonal groove 39 is provided on the adjusting block 38.

[0066] A transmission component, disposed on the cylinder bottom cover 3, cooperates with an adjusting component to adjust the initial deformation of the buffer spring 29. The transmission component includes:

[0067] Multiple transmission rods 32 are evenly distributed on the cylinder bottom cover 3, and one end of the transmission rod 32 extends into the annular groove 9 and abuts against the annular plate 28. The transmission rod 32 is slidably connected to the cylinder bottom cover 3.

[0068] The transmission plate 33 is fixedly installed at the end of the transmission rod 32 away from the cylinder top cover 2.

[0069] When the insert 19 enters the slot 8 and contacts the buffer sleeve 30 and impacts the buffer sleeve 30, the force of the insert 19 on the buffer sleeve 30 pushes the buffer sleeve 30 to slide in the annular groove 9, thereby compressing the buffer spring 29 and relieving the impact of the insert 19 on the buffer sleeve 30. Combined with the buffering effect of the first buffer mechanism, this further alleviates the impact at the end of the return stroke of the hydraulic cylinder.

[0070] The operator can also adjust the buffering effect of the hydraulic cylinder according to the actual load of the hydraulic cylinder. The specific process is as follows: The operator inserts an Allen wrench into the Allen groove 39 on the adjusting block 38, and rotates the Allen wrench to drive the adjusting block 38 to rotate. This causes the rotating rod 36, which is fixedly connected to the adjusting block 38, to rotate, and the adjusting screw 35, which is fixedly connected to the rotating rod 36, to rotate. Through the threaded transmission between the adjusting screw 35 and the threaded sleeve 34, the adjusting screw 35 moves into the adjusting groove 12, which in turn causes the rotating rod 36, which is fixedly connected to the adjusting screw 35, to move towards the adjusting groove 12. This causes the push plate 37, which is fixedly connected to the rotating rod 36, to push the transmission plate 33 towards the cylinder bottom cover 3, which in turn causes the transmission rod 32, which is fixedly connected to the transmission plate 33, to push the annular plate 28 to slide in the annular groove 9. This pressurizes the buffer spring 29 in the annular groove 9, thereby changing the initial deformation of the buffer spring 29 and increasing the initial force of the buffer spring 29 on the buffer sleeve 30.

[0071] This device incorporates a second buffer mechanism, which further buffers the hydraulic cylinder, significantly reducing the impact at the end of the return stroke and extending its service life. Furthermore, the second buffer mechanism can flexibly adjust the cylinder's buffering capacity based on its actual load conditions, making the device suitable for different load conditions and thus expanding its applicability.

[0072] Working principle: During operation, when the hydraulic cylinder returns, the piston plate 4 slides towards the cylinder bottom cover 3, which in turn causes the insert 19 and buffer boss on the piston plate 4 to slide towards the cylinder bottom cover 3. This allows the hydraulic oil between the piston plate 4 and the cylinder bottom cover 3 to be discharged from the hydraulic cylinder through the buffer chamber, the first connecting groove, the slot 8, and the second inlet / outlet 13. When the third-stage buffer platform 22 enters the first-stage buffer chamber 16, the flow area of ​​the hydraulic oil between the piston plate 4 and the cylinder bottom cover 3 entering the slot 8 through the buffer chamber decreases, thus creating a certain resistance to the return stroke of the piston plate 4. When the second-stage buffer platform 21 enters the first-stage buffer chamber 16, the flow area of ​​the hydraulic oil between the piston plate 4 and the cylinder bottom cover 3 entering the slot 8 through the buffer chamber further decreases, thus further increasing the resistance to the return stroke of the piston plate 4.

[0073] When the insert 19 enters the slot 8 and contacts the buffer sleeve 30 and impacts the buffer sleeve 30, the force of the insert 19 on the buffer sleeve 30 pushes the buffer sleeve 30 to slide in the annular groove 9, thereby compressing the buffer spring 29 and relieving the impact of the insert 19 on the buffer sleeve 30. Combined with the buffering effect of the first buffer mechanism, this further alleviates the impact at the end of the return stroke of the hydraulic cylinder.

[0074] The operator can also adjust the buffering effect of the hydraulic cylinder according to the actual load of the hydraulic cylinder. The specific process is as follows: The operator inserts an Allen wrench into the Allen groove 39 on the adjusting block 38, and rotates the Allen wrench to drive the adjusting block 38 to rotate. This causes the rotating rod 36, which is fixedly connected to the adjusting block 38, to rotate, and the adjusting screw 35, which is fixedly connected to the rotating rod 36, to rotate. Through the threaded transmission between the adjusting screw 35 and the threaded sleeve 34, the adjusting screw 35 moves into the adjusting groove 12, which in turn causes the rotating rod 36, which is fixedly connected to the adjusting screw 35, to move towards the adjusting groove 12. This causes the push plate 37, which is fixedly connected to the rotating rod 36, to push the transmission plate 33 towards the cylinder bottom cover 3, which in turn causes the transmission rod 32, which is fixedly connected to the transmission plate 33, to push the annular plate 28 to slide in the annular groove 9. This puts pressure on the buffer spring 29 in the annular groove 9, thereby changing the initial deformation of the buffer spring 29 and increasing the initial force of the buffer spring 29 on the buffer sleeve 30.

[0075] The above description of the embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic cylinder with a buffer function, comprising a cylinder barrel (1), a cylinder top cover (2), a cylinder bottom cover (3), and a piston plate (4), wherein the cylinder barrel (1) is fixedly disposed between the cylinder top cover (2) and the cylinder bottom cover (3), the piston plate (4) is slidably disposed within the cylinder barrel (1), and a piston rod (5) penetrating the cylinder top cover (2) is fixedly disposed on the surface of the piston plate (4) near the cylinder top cover (2), the piston rod (5) being slidably connected to the cylinder top cover (2), characterized in that, The cylinder top cover (2) and cylinder bottom cover (3) have a column groove (6) on their opposite sides. The cylinder top cover (2) has a first inlet / outlet (7) communicating with the column groove (6). The cylinder bottom cover (3) and cylinder top cover (2) have a slot (8) on their opposite sides. The surface of the slot (8) away from the piston plate (4) has an annular groove (9). A limiting groove (10) is formed in the annular groove (9). The surface of the cylinder bottom cover (3) with the slot (8) also has multiple evenly distributed buffer chambers. The cylinder bottom cover (3) has a first connecting groove (11) that communicates with the slot (8). The cylinder bottom cover (3) has an adjustment groove (12) on its surface away from the cylinder top cover (2). The axis of the adjustment groove (12) coincides with the axis of the slot (8). The cylinder bottom cover (3) has a second inlet / outlet (13) that communicates with the slot (8). The cylinder bottom cover (3) is provided with fasteners. The piston plate (4) is provided with a first buffer mechanism on its surface near the cylinder bottom cover (3). The cylinder bottom cover (3) is provided with a second buffer mechanism. The buffer chamber is formed by connecting a primary buffer chamber (16), a secondary buffer chamber (17) and a tertiary buffer chamber (18), and the inner diameters of the primary buffer chamber (16), the secondary buffer chamber (17) and the tertiary buffer chamber (18) decrease step by step. The tertiary buffer chamber (18) is connected to the slot (8) through the first connecting groove (11). The first buffer mechanism includes: The buffer boss has multiple buffer bosses, and the multiple buffer bosses are evenly distributed on the surface of the piston plate (4) near the cylinder bottom cover (3), and the buffer bosses are fixedly connected to the piston plate (4). The number of buffer bosses is equal to the number of buffer chambers. Insertion post (19) is fixedly installed on the surface of the piston plate (4) near the cylinder bottom cover (3), and the axis of insertion post (19) coincides with the axis of slot (8); The buffer boss is formed by a first-level buffer platform (20), a second-level buffer platform (21) and a third-level buffer platform (22) connected in sequence. The outer diameters of the first-level buffer platform (20), the second-level buffer platform (21) and the third-level buffer platform (22) are respectively adapted to the inner diameters of the first-level buffer cavity (16), the second-level buffer cavity (17) and the third-level buffer cavity (18). The insert (19) has a through cavity (23) on its surface near the slot (8). The insert (19) with the through cavity (23) has a plurality of evenly distributed travel grooves (24). The insert (19) has a plurality of second connecting grooves (25) on its surface for connecting the travel grooves (24) and the through cavity (23). The second buffer mechanism includes: The annular plate (28) is slidably disposed within the annular groove (9); The buffer spring (29) has multiple springs, and the multiple buffer springs (29) are evenly distributed in the annular groove (9). The buffer springs (29) are always in a compressed state. The buffer sleeve (30) is slidably connected to the annular groove (9), and the surface of the buffer sleeve (30) near the buffer spring (29) abuts against the buffer spring (29). An annular limiting block (31) is fixedly provided on the surface of the buffer sleeve (30), and the annular limiting block (31) is slidably connected to the limiting groove (10). An adjusting element is provided on the cylinder bottom cover (3). The adjusting element is used to adjust the initial deformation of the buffer spring (29) to buffer and adapt to the load of the hydraulic cylinder under different working conditions. A transmission component is provided on the cylinder bottom cover (3), and the transmission component cooperates with the adjustment component to adjust the initial deformation of the buffer spring (29); The transmission component includes: The transmission rod (32) has multiple transmission rods (32) evenly distributed on the cylinder bottom cover (3), and one end of the transmission rod (32) extending into the annular groove (9) abuts against the annular plate (28). The transmission rod (32) is slidably connected to the cylinder bottom cover (3). A transmission plate (33) is fixedly disposed at the end of the transmission rod (32) away from the cylinder top cover (2); The adjusting element includes: A threaded sleeve (34) is fixedly installed on the surface of the cylinder bottom cover (3) away from the cylinder top cover (2), and the axis of the threaded sleeve (34) coincides with the axis of the adjusting groove (12); An adjusting screw (35) is inserted into an adjusting groove (12) at one end and threadedly connected to the threaded sleeve (34). A rotating rod (36) that is rotatably connected to the transmission plate (33) is fixedly connected to the end of the adjusting screw (35) away from the adjusting groove (12). A push plate (37) is fixedly provided on the rotating rod (36). The push plate (37) is always in contact with the transmission plate (33). An adjusting block (38) is fixedly provided on the end of the rotating rod (36) away from the adjusting screw (35). An internal hexagonal groove (39) is provided on the adjusting block (38).

2. A hydraulic cylinder with a buffer function according to claim 1, characterized in that, The fasteners include: There are four fastening rods (14), and the two ends of the four fastening rods (14) pass through the cylinder top cover (2) and the cylinder bottom cover (3) respectively, and the ends of the fastening rods (14) are provided with threads; Nuts (15) are provided at both ends of the fastening rod (14), and the nuts (15) are threadedly connected to the ends of the fastening rod (14).

3. A hydraulic cylinder with a buffer function according to claim 2, characterized in that, A bushing (26) is fixedly installed on the surface of the piston plate (4) near the cylinder top cover (2), and the axis of the bushing (26) coincides with the axis of the piston rod (5). Multiple fluid passage grooves (27) penetrating the end face of the bushing (26) are opened on the surface of the bushing (26).

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