Reset buffer structure of hydraulic oil cylinder

Abstract

The utility model discloses a hydraulic oil cylinder reset buffering structure, which belongs to the technical field of oil hydraulic cylinders and is characterized by comprising an oil hydraulic cylinder, a piston rod is movably connected to the inner side of the oil hydraulic cylinder, an elastic buffering mechanism is movably connected to the outer side of the piston rod, and a negative pressure oil buffering mechanism is movably connected to the inner side of the piston rod. A composite buffering structure can be formed in the descending process of the piston rod, the buffering performance is enhanced, force transmission and buffering are achieved, the distance between the piston discs is compressed, a hollow telescopic block is driven to slide, and a pull rod rotates to pull a linkage block through the primary positioning and pressure applying of the bottom piston disc when a reset point is contacted and the synergistic effect of the top piston disc and the bottom piston disc after a limiting plate is contacted. The reset pressure can be decomposed and converted into elastic potential energy and mechanical work, the reset process of the piston rod is effectively buffered, the stability and reliability of overall operation are improved, and the problems that equipment is damaged and the service life of oil hydraulic cylinder parts is shortened due to too fast reset can be effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a hydraulic cylinder reset buffer structure. Background Technology

[0002] Hydraulic cylinders, also known as hydraulic cylinders, trace their technological background back to early applications of hydraulic transmission. In the late 19th century, with the advancement of the Industrial Revolution, hydraulic technology began to develop, and hydraulic cylinders, as actuators, were gradually applied to various mechanical equipment. Early hydraulic cylinders had simple structures and limited performance. However, with continuous advancements in materials science, manufacturing processes, and control technology, hydraulic cylinders have seen significant improvements in precision, pressure rating, and service life. Modern hydraulic cylinders are widely used in engineering machinery, metallurgy, mining, aerospace, and many other fields, becoming key components for achieving linear reciprocating motion or oscillation, providing reliable guarantees for power transmission and motion control under various complex working conditions.

[0003] In the existing technology, the piston is prone to hitting the cylinder body during the return stroke, mainly the piston hitting the end cap, which causes problems such as large impact force, high noise, and short life; and the hydraulic oil generates a high-speed impact force on the oil tank when it flows back, causing the hydraulic oil in the oil tank to fluctuate, causing the hydraulic oil to be carried out along the muffler port when exhausting.

[0004] To address the aforementioned issues, an existing patent (publication number: CN207660927U) proposes a hydraulic cylinder reset buffer structure. This structure features an axially positioned hydraulic buffer end on the rear side of a high-pressure piston, a hydraulic channel connecting the high-pressure cylinder to the middle cover, and a buffer step at the front end of the hydraulic channel. The hydraulic buffer end is housed within the buffer step during rearward reset. A pneumatic buffer end engages with the side wall of the buffer step, with a gap between them. A pneumatic-hydraulic booster cylinder includes a booster cylinder, wherein the front end of the booster cylinder is axially connected to the high-pressure cylinder of the aforementioned high-pressure cylinder structure. This invention provides a hydraulic buffer device for a pneumatic-hydraulic booster cylinder, achieving buffering and avoiding problems such as high impact force, high noise, and short lifespan caused by the piston's high-speed impact on the middle cover.

[0005] To address the aforementioned issues, existing patents have provided solutions. However, during the reset and buffering process of the hydraulic cylinder, buffering is typically achieved by addressing the impact point at the bottom of the cylinder without intervening in the downward stroke of the hydraulic cylinder. This results in limited buffering capacity and poor buffering effect.

[0006] To address this, a hydraulic cylinder reset buffer structure is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a hydraulic cylinder reset buffer structure that can solve the problem that existing methods only focus on the large impact at the bottom of the reset hydraulic cylinder and do not intervene in the reset descent stroke, resulting in limited buffering effect.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic cylinder reset buffer structure, including a hydraulic cylinder, a piston rod movably connected to the inner side of the hydraulic cylinder, an elastic buffer mechanism movably connected to the outer side of the piston rod, and a negative pressure oil buffer mechanism movably connected to the inner side of the piston rod;

[0009] The elastic buffer mechanism includes a piston disc, a hollow telescopic block, a hollow support block, and an elastic force-sharing component. The top piston disc is movably connected to the bottom of the piston rod outside, the bottom piston disc is movably connected to the outside of the negative pressure oil buffer mechanism, the hollow telescopic block is fixedly connected to the outside of the piston disc, the hollow support block is slidably connected to the outside of the hollow telescopic block, and the elastic force-sharing component is movably connected to the inside of the hollow support block.

[0010] Preferably, the negative pressure oil buffer mechanism includes an extension rod, an inner oil cavity, a negative pressure oil suction port, a connecting soft plug, and a push rod.

[0011] Preferably, the inner oil chamber is located at the bottom of the inner side of the piston rod, the piston rod is slidably connected to the inner side of the inner oil chamber, the negative pressure oil suction port is located at the bottom of the inner side of the extension rod, and the bottom piston plate is fixedly connected to the outer side of the bottom of the extension rod.

[0012] Preferably, the linkage soft plug is movably connected to the inner side of the extension rod, the linkage soft plug is located on the outer side of the negative pressure oil suction port, and the push rod is fixedly connected to the top of the inner side of the inner oil cavity.

[0013] Preferably, the elastic force component includes a guide rod, a connecting block, a compression spring, and a pull rod.

[0014] Preferably, the guide rod is fixedly connected to the inner side of the hollow support block, the linkage block is slidably connected to the outer side of the guide rod, the compression spring is fixedly connected to the outer side of the linkage rod, the compression spring is fixedly connected to the inner side of the hollow support block, the pull rod is rotatably connected to the top and bottom of the linkage block, the pull rod is rotatably connected to the bottom of the inner side of the top hollow telescopic block, and the pull rod is rotatably connected to the top of the inner side of the bottom hollow telescopic block.

[0015] Preferably, an oil supply tank is fixedly connected to the left side of the hydraulic cylinder, and oil supply pipes are movably connected to the top and bottom of the oil supply tank.

[0016] Preferably, an oil inlet is movably connected to the left side of the hydraulic cylinder, and the oil supply pipe is movably connected to the inside of the oil inlet.

[0017] Preferably, the inner side of the hydraulic cylinder is movably connected to a limiting plate, with the top limiting plate located at the bottom of the top oil inlet and the bottom limiting plate located at the top of the bottom oil inlet.

[0018] Preferably, a load-bearing plate is fixedly connected to the top of the piston rod.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This application, by setting an elastic buffer mechanism, can form a composite buffer structure during the piston rod descent, enhancing the buffering performance. When the bottom piston plate initially positions and applies pressure upon contacting the reset point, after contacting the limiting plate, the top and bottom piston plates work together to achieve force transmission and buffering, as well as compress the piston plate spacing, causing the hollow telescopic block to slide. The pull rod rotates and pulls the linkage block, causing the compression spring to be compressed. This can decompose the reset pressure into elastic potential energy and mechanical work, effectively buffering the piston rod reset process, reducing impact, and improving the overall stability and reliability of operation.

[0021] 2. This application incorporates a negative pressure oil buffer mechanism. During oil injection, the connecting soft plug moves upwards to the inner oil chamber, rapidly compressing air to create negative pressure. The negative pressure oil suction port then draws in oil, achieving automatic oil suction and reserving energy for subsequent buffering. During the extension rod retraction phase, the connecting soft plug contacts the push rod, and the oil is squeezed out through the small negative pressure oil suction port. Because oil discharge requires significant thrust, this process greatly slows down the reset speed, similar to decelerating the piston rod reset. This effectively avoids equipment damage and shortened lifespan of hydraulic cylinder components caused by excessively rapid reset, ensuring stable and long-term equipment operation and reducing maintenance costs. Attached Figure Description

[0022] Figure 1 This is an overall structural diagram of a hydraulic cylinder reset buffer structure according to the present invention;

[0023] Figure 2 This is a diagram showing the internal structure of the hydraulic cylinder of this utility model;

[0024] Figure 3 This is an overall structural diagram of the elastic buffer mechanism of this utility model;

[0025] Figure 4 This is an overall structural diagram of the elastic force component of this utility model;

[0026] Figure 5 This is an overall structural diagram of the negative pressure oil buffer mechanism of this utility model.

[0027] In the diagram, 1. Hydraulic cylinder; 2. Piston rod; 3. Elastic buffer mechanism; 31. Piston disc; 32. Hollow telescopic block; 33. Hollow support block; 34. Elastic force component; 34a. Guide rod; 34b. Linking block; 34c. Compression spring; 34d. Pull rod; 4. Negative pressure oil buffer mechanism; 41. Extension rod; 42. Inner oil chamber; 43. Negative pressure oil suction port; 44. Linking soft plug; 45. Push rod; 5. Oil supply tank; 6. Oil delivery pipe; 7. Oil inlet; 8. Limiting plate; 9. Load-bearing plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-5 The present invention provides the following technical solution:

[0030] A hydraulic cylinder reset buffer structure includes a hydraulic cylinder 1, a piston rod 2 movably connected to the inner side of the hydraulic cylinder 1, an elastic buffer mechanism 3 movably connected to the outer side of the piston rod 2, and a negative pressure oil buffer mechanism 4 movably connected to the inner side of the piston rod 2.

[0031] The elastic buffer mechanism 3 includes a piston disc 31, a hollow telescopic block 32, a hollow support block 33, and an elastic force-sharing component 34. The top piston disc 31 is movably connected to the bottom of the piston rod 2 on the outside, and the bottom piston disc 31 is movably connected to the outside of the negative pressure oil buffer mechanism 4. The hollow telescopic block 32 is fixedly connected to the outside of the piston disc 31, the hollow support block 33 is slidably connected to the outside of the hollow telescopic block 32, and the elastic force-sharing component 34 is movably connected to the inside of the hollow support block 33.

[0032] In this embodiment, a composite buffer structure is formed by two sets of piston discs 31, their inner hollow telescopic blocks 32, and hollow support blocks 33. When the two sets of piston discs 31 press against each other, they counteract the downward pressure of the oil during reset, avoiding excessive impact. Furthermore, when the two sets of piston discs 31 squeeze against each other, the internal elastic force-sharing components 34 release mutual forces to both sides, further counteracting and buffering the impact.

[0033] Specifically, such as Figure 3 , Figure 5 As shown, the negative pressure oil buffer mechanism 4 includes an extension rod 41, an inner oil chamber 42, a negative pressure oil suction port 43, a connecting soft plug 44, and a push rod 45.

[0034] Specifically, such as Figure 3 , Figure 5 As shown, the inner oil cavity 42 is opened at the bottom of the inner side of the piston rod 2, the piston rod 2 is slidably connected to the inner side of the inner oil cavity 42, the negative pressure oil suction port 43 is opened at the bottom of the inner side of the extension rod 41, and the bottom piston plate 31 is fixedly connected to the outer side of the bottom of the extension rod 41.

[0035] Specifically, such as Figure 3 , Figure 5 As shown, the linkage soft plug 44 is movably connected to the inner side of the extension rod 41, the linkage soft plug 44 is located on the outer side of the negative pressure oil suction port 43, and the push rod 45 is fixedly connected to the top of the inner side of the inner oil cavity 42.

[0036] In this embodiment: when injecting oil, before pushing the bottom piston disc 31, the oil will push the connecting soft plug 44 to slide up along the inner side of the extension rod 41 to the inner oil cavity 42. The connecting soft plug 44 rises rapidly, quickly compressing the air in the extension rod 41 and the inner oil cavity 42 to form a negative pressure. This causes the negative pressure oil suction port 43, which was originally blocked by it, to generate a strong suction force, sucking the oil into the unfilled part, causing the extension rod 41 to contract. During the contraction, the connecting soft plug 44 touches the push rod 45 at the top of the inner oil cavity 42. The push rod 45 squeezes the connecting soft plug 44, and the stored oil is discharged from the negative pressure oil suction port 43 of the push rod 45. Because the oil suction port is small and the discharge requires a lot of force, it greatly buffers the lower height reset of the piston rod 2, avoiding equipment damage and shortening the life of the hydraulic cylinder 1 components due to excessively fast reset.

[0037] Specifically, such as Figure 3 , Figure 4 As shown, the elastic force component 34 includes a guide rod 34a, a linkage block 34b, a compression spring 34c, and a pull rod 34d.

[0038] Specifically, such as Figure 3 , Figure 4 As shown, guide rod 34a is fixedly connected to the inner side of hollow support block 33, linkage block 34b is slidably connected to the outer side of guide rod 34a, compression spring 34c is fixedly connected to the outer side of linkage rod, compression spring 34c is fixedly connected to the inner side of hollow support block 33, pull rod 34d is rotatably connected to the top and bottom of linkage block 34b, pull rod 34d is rotatably connected to the bottom of the inner side of top hollow telescopic block 32, and pull rod 34d is rotatably connected to the top of the inner side of bottom hollow telescopic block 32.

[0039] In this embodiment: during the sliding process, the pull rods 34d on the inner side of the two pairs of hollow telescopic blocks 32 rotate when pressing down and rising, pulling the linkage block 34b that is rotatably connected to the other side, so that the linkage block 34b slides back and forth on the guide rod 34a on the inner side of the hollow support block 33, squeezing the compression spring 34c between it and the inner wall of the hollow support block 33, thereby decomposing the reset pressure and converting it into elastic potential energy and mechanical work.

[0040] Specifically, such as Figure 1 , Figure 2 As shown, an oil supply tank 5 is fixedly connected to the left side of the hydraulic cylinder 1, and oil supply pipes 6 are movably connected to the top and bottom of the oil supply tank 5.

[0041] Specifically, such as Figure 1 , Figure 2 As shown, the left side of the hydraulic cylinder 1 is movably connected to the oil inlet 7, and the oil supply pipe 6 is movably connected to the inside of the oil inlet 7.

[0042] In this embodiment, the oil inside the oil tank 5 can be transported to the oil inlet 7 through the oil pipeline 6 without the need for external supply equipment, and the oil can be collected and reused from the other side when it is lifted or reset.

[0043] Specifically, such as Figure 2 As shown, a limiting plate 8 is movably connected to the inner side of the hydraulic cylinder 1. The top limiting plate 8 is located at the bottom of the top oil inlet 7, and the bottom limiting plate 8 is located at the top of the bottom oil inlet 7.

[0044] Specifically, such as Figure 1 , Figure 2 As shown, a load-bearing plate 9 is fixedly connected to the top of the piston rod 2.

[0045] In this example: the piston disc 31 can be positioned by the limiting plate 8, thereby reserving sufficient space for liquid injection, and the load-bearing plate 9 can support items or connect other equipment.

[0046] Working principle: When using the hydraulic cylinder 1 for lifting operations, the oil supply tank 5 delivers oil to the bottom of the hydraulic cylinder 1 through the bottom oil pipe 6, lifting the piston rod 2. The oil first contacts the extension structure of the extension rod 41 inside the bottom piston disc 31, specifically the connecting soft plug 44, which is located on one side inside the extension rod 41 and on the other side below the bottom limiting plate 8. The injected oil pushes the connecting soft plug 44 upwards before it moves the bottom piston disc 31, allowing it to slide inside the extension rod 41 and move into the inner oil chamber 42. The rapid lifting of the connecting soft plug 44 rapidly compresses the air inside the extension rod 41 and the inner oil chamber 42, creating a negative pressure effect. This dissipates the negative pressure that was originally blocked by the connecting soft plug 44. The suction port 43 generates a large suction force to draw some oil into the extension rod 41 and the inner oil cavity 42. After absorption, the oil rises over the top limiting plate 8, lifting the bottom piston plate 31 and raising the entire piston rod 2. The top limiting plate 8 limits the maximum lifting distance of the hydraulic cylinder 1 and limits the top piston plate 31 to the bottom of the top oil inlet 7 for easy oil delivery and reset. After use, the oil delivery to the bottom oil inlet 7 is reset. During the descent of the piston rod 2, it and the two sets of piston plates 31 on the outside of the extension rod 41 form a composite buffer structure. When it contacts the reset point, the bottom piston plate 31 performs initial positioning and pressure application. After contacting the limiting plate 8, the oil flows down... The top piston disc 31 applies downward pressure, while the bottom piston disc 31 contacts the limiting plate 8 and transmits an interaction force upward. During this process, the distance between the top and bottom piston discs 31 is compressed, causing the hollow telescopic blocks 32 to slide inward toward the hollow support block 33. During this sliding process, the pull rods 34d on the inner side of the two pairs of hollow telescopic blocks 32 rotate during downward and upward movements, pulling the connecting block 34b rotatably connected to it on the other side. This causes the block to slide back and forth on the guide rod 34a on the inner side of the hollow support block 33, compressing the compression spring 34c between it and the inner wall of the hollow support block 33. This decomposes the reset pressure into elastic potential energy and mechanical force. The piston rod 2 is reset by buffering the resetting process. During the mutual compression and contraction of the two piston discs 31, the extension rod 41 will slide towards the unfilled part of the inner oil cavity 42 at the bottom of the piston rod 2, causing it to contract. During the contraction process, the connecting soft plug 44 will contact the push rod 45 at the top of the inner oil cavity 42, so that the push rod 45 will squeeze the connecting soft plug 44 and push the oil stored in the inner oil cavity 42 and the inner side of the extension rod 41 to be discharged through the negative pressure oil suction port 43 of the push rod 45. Because the negative pressure oil suction port 43 is small, a large thrust is required to discharge the liquid, thereby greatly buffering the resetting process at the lower height and avoiding the problem of excessive resetting speed, which could lead to equipment damage and short service life of the hydraulic cylinder 1 components.

[0047] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder reset buffer structure, comprising a hydraulic cylinder (1), characterized in that: The piston rod (2) is movably connected to the inner side of the hydraulic cylinder (1), the elastic buffer mechanism (3) is movably connected to the outer side of the piston rod (2), and the negative pressure oil buffer mechanism (4) is movably connected to the inner side of the piston rod (2). The elastic buffer mechanism (3) includes a piston disc (31), a hollow telescopic block (32), a hollow support block (33), and an elastic force component (34). The top piston disc (31) is movably connected to the bottom of the piston rod (2) on the outside. The bottom piston disc (31) is movably connected to the outside of the negative pressure oil buffer mechanism (4). The hollow telescopic block (32) is fixedly connected to the outside of the piston disc (31). The hollow support block (33) is slidably connected to the outside of the hollow telescopic block (32). The elastic force component (34) is movably connected to the inside of the hollow support block (33).

2. The hydraulic cylinder reset buffer structure according to claim 1, characterized in that: The negative pressure oil buffer mechanism (4) includes an extension rod (41), an inner oil chamber (42), a negative pressure oil suction port (43), a connecting soft plug (44), and a push rod (45).

3. The hydraulic cylinder reset buffer structure according to claim 2, characterized in that: The inner oil cavity (42) is located at the bottom of the inner side of the piston rod (2), the piston rod (2) is slidably connected to the inner side of the inner oil cavity (42), the negative pressure oil suction port (43) is located at the bottom of the inner side of the extension rod (41), and the bottom piston plate (31) is fixedly connected to the outer side of the bottom of the extension rod (41).

4. The hydraulic cylinder reset buffer structure according to claim 2, characterized in that: The linkage soft plug (44) is movably connected to the inside of the extension rod (41), the linkage soft plug (44) is located on the outside of the negative pressure oil suction port (43), and the push rod (45) is fixedly connected to the top of the inside of the inner oil cavity (42).

5. The hydraulic cylinder reset buffer structure according to claim 1, characterized in that: The elastic force component (34) includes a guide rod (34a), a linkage block (34b), a compression spring (34c), and a pull rod (34d).

6. The hydraulic cylinder reset buffer structure according to claim 5, characterized in that: The guide rod (34a) is fixedly connected to the inner side of the hollow support block (33), the linkage block (34b) is slidably connected to the outer side of the guide rod (34a), the compression spring (34c) is fixedly connected to the outer side of the linkage rod, the compression spring (34c) is fixedly connected to the inner side of the hollow support block (33), the pull rod (34d) is rotatably connected to the top and bottom of the linkage block (34b), the pull rod (34d) is rotatably connected to the bottom of the inner side of the top hollow telescopic block (32), and the pull rod (34d) is rotatably connected to the top of the inner side of the bottom hollow telescopic block (32).

7. The hydraulic cylinder reset buffer structure according to claim 1, characterized in that: The oil cylinder (1) is fixedly connected to an oil supply tank (5) on its left side, and the top and bottom of the oil supply tank (5) are movably connected to oil delivery pipes (6).

8. A hydraulic cylinder reset buffer structure according to claim 7, characterized in that: The left side of the hydraulic cylinder (1) is movably connected to an oil inlet (7), and the oil supply pipe (6) is movably connected to the inside of the oil inlet (7).

9. A hydraulic cylinder reset buffer structure according to claim 8, characterized in that: The inner side of the hydraulic cylinder (1) is movably connected to a limiting plate (8), the top limiting plate (8) is located at the bottom of the top oil inlet (7), and the bottom limiting plate (8) is located at the top of the bottom oil inlet (7).

10. A hydraulic cylinder reset buffer structure according to claim 1, characterized in that: A load-bearing plate (9) is fixedly connected to the top of the piston rod (2).

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