High-frequency hydraulic cylinder with buffer structure
By integrating a buffer structure with through holes, oil passages, and check valves into the hydraulic cylinder, and combining oil pressure and throttling methods, the problem of short service life of the hydraulic cylinder buffer structure is solved, achieving long service life and precise rebound effect for high-frequency use, and reducing maintenance costs.
Patent Information
- Application Number
- CN202520483660.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-19
AI Technical Summary
Existing hydraulic cylinder buffer structures have a short service life, are not suitable for high-frequency use, and their buffering effect decreases rapidly under high-frequency motion, resulting in high maintenance costs.
The system employs a buffer structure consisting of a through-hole, a first oil passage, a second oil passage, and a one-way valve. It combines the oil pressure and throttling method within the hydraulic cylinder for buffering, eliminating the need for elastic components. Through the low-friction design between the guide sleeve and the piston rod, and the use of sealing rings, the system increases service life and provides precise rebound.
It achieves long service life and precise rebound effect of hydraulic cylinders under high-frequency use conditions, reduces maintenance costs and the risk of cylinder leakage, and is suitable for space-constrained equipment.
Smart Images
Figure CN223825354U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of hydraulic cylinders, in particular to a high-frequency hydraulic cylinder with a buffer structure. BACKGROUND
[0002] For the common die stamping industry, the industry mainly applies pressure to the plate, strip and the like through the die to make them into a certain special shape, and the execution element such as the hydraulic cylinder faces problems such as high frequency of operation, bearing of large impact, complex structure, large hydraulic energy consumption and the like in the use process.
[0003] The ordinary buffer structure in the existing hydraulic cylinder mostly adopts a buffer matching surface with a certain angle to reduce the flow to achieve the effect of buffering, at the same time, the buffer valve, the one-way valve and the like need to be used together, the structure is complex, and with the increase of the movement frequency, the matching surface is seriously worn, the buffering effect sharply decreases after a certain number of buffering effects, and then disappears, and the maintenance cost is high; for the single-acting hydraulic cylinder, when the piston rod is retracted after being subjected to external force load, the elastic element is mostly used to achieve the rebound function for the oil cylinder with a rebound stroke, the elastic element is repeatedly stretched in the process of high-frequency use, which easily leads to the decrease of the elastic effect, the service life is low, the rebound distance is uncontrollable, the precision is not high, and the elastic element is not suitable for the buffering of the high-frequency hydraulic cylinder. CONTENT OF THE UTILITY MODEL
[0004] The technical problem to be solved by the present application is that the service life of the buffer structure in the existing hydraulic cylinder is short, and the buffer structure is not suitable for the buffering of the high-frequency hydraulic cylinder.
[0005] Therefore, the present application provides a high-frequency hydraulic cylinder with a buffer structure.
[0006] The technical scheme adopted by the present application to solve the technical problem is:
[0007] The high-frequency hydraulic cylinder with a buffer structure comprises,
[0008] a cylinder barrel, and
[0009] a piston rod, the piston rod is inserted into the cylinder barrel, a rodless cavity is formed between the piston rod and the bottom of the cylinder barrel, and an end portion of the piston rod in the cylinder barrel is provided with a piston part;
[0010] a guide sleeve, the guide sleeve is arranged between the cylinder barrel and the piston rod, and a rod cavity is formed between the guide sleeve and the piston part;
[0011] The piston part is provided with a through hole, the piston rod is provided with a first oil channel and a second oil channel, the first oil channel and the second oil channel are in communication with the through hole, the second oil channel is located on one side of the first oil channel close to the rodless cavity, and a one-way valve is arranged in the second oil channel.
[0012] Furthermore, multiple second oil passages are arranged along the circumference of the piston rod, and each second oil passage is equipped with a one-way valve.
[0013] Furthermore, an oil sleeve is provided inside the cylinder, the sleeve is located between the piston rod and the cylinder, the piston rod and the sleeve are slidably engaged, a limiting surface is provided on the sleeve, the limiting surface is positioned facing the bottom of the cylinder, and an abutment surface is provided on the piston rod that engages with the limiting surface.
[0014] Furthermore, a pressure cap is provided at the cylinder opening, and a fixing pin is provided on the pressure cap. The fixing pin passes through the pressure cap, the sleeve and connects to the guide sleeve.
[0015] Furthermore, a rod sealing ring is provided between the guide sleeve and the piston rod, and a static seal is provided between the guide sleeve and the cylinder.
[0016] Furthermore, a dustproof ring is provided between the sleeve and the piston rod.
[0017] Furthermore, the cylinder is provided with an exhaust port, which is connected to the gap between the sleeve and the piston rod.
[0018] Furthermore, a sealing ring for a hole is provided between the piston and the cylinder.
[0019] Furthermore, the guide sleeve is made of copper.
[0020] The beneficial effects of this utility model are that the present application provides buffering for the piston rod through a buffer structure including a through hole, a first oil passage, a second oil passage and a one-way valve. The buffer structure is simple in structure, and the scheme of embedding the one-way valve in the piston rod reduces the risk of oil cylinder leakage and reduces the maintenance cost of the oil cylinder. The structure buffers by combining stable oil pressure P in the hydraulic cylinder with throttling, without the need to set up elastic elements, thus the service life of the structure is longer.
[0021] Furthermore, rubber sealing rings are installed between the guide sleeve and the piston rod, and between the piston and the cylinder, forming a low-friction design to increase its sealing service life. The addition of the copper guide sleeve allows the cylinder to withstand greater lateral loads, especially the loads inherent in the stamping process in the stamping industry. This enables the cylinder structure to maintain a long service life and precise rebound effect under high-frequency use conditions. Attached Figure Description
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] Figure 1 This is a schematic diagram of the high-frequency hydraulic cylinder with a buffer structure in this utility model.
[0024] Figure 2 It is used to embody Figure 1 MM-direction cross-section view of the location of the check valve.
[0025] Figure 3 This is a schematic diagram of the piston rod buffering process in this utility model.
[0026] Figure 4 This is a structural schematic diagram of the exhaust port location in this utility model.
[0027] In the diagram: 1. Cylinder; 2. Piston rod; 3. Guide sleeve; 4. Sleeve; 5. Gland; 6. Check valve; 7. Fixing pin; 8. Rod chamber; 9. Rodless chamber; 10. Through hole; 11. First oil passage; 12. Second oil passage; 13. Oil inlet; 14. Static seal; 15. Rod sealing ring; 16. Hole sealing ring; 17. Limiting surface; 18. Piston section; 19. Exhaust port. Detailed Implementation
[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] ReferenceFigure 1 A high-frequency hydraulic cylinder with a buffer structure includes a cylinder barrel 1, a piston rod 2, a guide sleeve 3, a sleeve 4, a pressure cap 5, and a one-way valve 6. The piston rod 2 is coaxially inserted into the cylinder barrel 1. The guide sleeve 3 and the sleeve 4 are both disposed inside the cylinder barrel 1 and located between the piston rod 2 and the cylinder barrel 1. The guide sleeve 3 is disposed on the side near the bottom of the cylinder barrel 1. The pressure cap 5 is connected to the cylinder opening of the cylinder barrel 1. A fixing pin 7 is connected to the pressure cap 5. The fixing pin 7 passes through the pressure cap 5 and the sleeve 4 and is connected to the guide sleeve 3.
[0032] The sleeve 4 is provided with a limiting surface 17 to restrict the movement of the piston rod 2. The limiting surface 17 faces the bottom of the cylinder 1, and the piston rod 2 is provided with an abutment surface that mates with the limiting surface 17. A rod sealing ring 15 is provided between the guide sleeve 3 and the piston rod 2, a static seal 14 is provided between the guide sleeve 3 and the cylinder 1, and a dustproof ring is provided between the sleeve 4 and the piston rod 2. Specifically, to cope with the high-frequency contact between the outer circle of the piston rod 2 and the inner wall of the guide sleeve 3, the guide sleeve 3 is made of copper, and the piston rod 2 is made of high-strength alloy steel, thereby improving the service life of the piston rod 2 and the guide sleeve 3.
[0033] A piston part 18 is connected to the bottom of the piston rod 2. The piston part 18 is integrally formed with the piston rod 2. The piston part 18 slides axially along the cylinder 1 between the guide sleeve 3 and the bottom of the cylinder 1. A sealing ring 16 for a hole is provided between the piston part 18 and the cylinder 1. A rod cavity 8 is formed between the piston part 18 and the guide sleeve 3. A rodless cavity 9 is formed between the bottom of the cylinder 1 and the piston part 18. An oil inlet 13 is provided at the bottom of the cylinder 1, and the oil inlet 13 communicates with the rodless cavity 9.
[0034] Reference Figure 1 and Figure 2 The piston section 18 has a through hole 10 at one end facing the bottom of the cylinder 1, extending into the piston rod 2. The through hole 10, piston rod 2, and cylinder 1 are coaxially arranged. Multiple first oil passages 11 are formed along the circumference of the piston rod 2, with their length direction aligned radially with the piston rod 2. The first oil passages 11 communicate with the through hole 10. Multiple second oil passages 12 are also formed along the circumference of the piston rod 2, with their length direction aligned radially with the piston rod 2. The second oil passages 12 communicate with the through hole 10 and are located on the side of the first oil passages 11 closest to the bottom of the cylinder 1. A one-way valve 6 is disposed within the second oil passage 12. In this application, six first oil passages 11 and six second oil passages 12 are provided along the circumference of the piston rod 2.
[0035] The implementation principle of this application is as follows:
[0036] There is always an oil pressure P in the rodless chamber 9. When the piston rod 2 is subjected to an external load, when the load is greater than P, the piston rod 2 begins to move horizontally to the right. The volume of the rod chamber 8 begins to increase, and its running distance is determined according to the size of the workpiece, but it will never exceed the full stroke of the cylinder. During the rightward movement, the first oil passage 11 moves toward the bottom of the cylinder 1 along with the piston rod 2. The oil enters the rod chamber 8 through the first oil passage 11. After being affected by the external load and the size of the workpiece, the piston rod 2 stops at a certain position.
[0037] When the external load disappears, the hydraulic cylinder will gradually buffer under the action of the oil pressure P in the rodless chamber 9, eventually returning to its original state. The buffering state has three parts:
[0038] When the overlap area between the right end face of the guide sleeve 3 and the first oil passage 11 is 0 (the first oil passage 11 is located on the side of the guide sleeve 3 near the bottom of the cylinder 1, refer to...) Figure 3 (small image a in the image);
[0039] The hydraulic cylinder begins to buffer as the overlap area between the first oil passage 11 and the guide sleeve 3 increases (refer to...). Figure 3 (See small figure b in the figure), the oil in the rodless chamber 9 enters the rod chamber 8 through the first oil passage 11 and begins to throttle, thereby slowing down the rebound speed of its piston rod 2;
[0040] When the right end face of the guide sleeve 3 completely overlaps with the first oil passage 11, the volume of oil entering the rod cavity 8 becomes 0 (reference). Figure 3 (See small figure c in the figure). However, the piston rod 2 will not stop immediately. There is still oil in the rod chamber 8. Under the presence of oil pressure P, due to the presence of the sealing ring 16 installed in the hole on the outer circle of the piston rod 2, the oil in the rod chamber 8 is squeezed and begins to pass through the six evenly distributed one-way valves 6 installed inside the piston rod 2, and then enters the rodless chamber 9. The sleeve is fixed inside the cylinder 1 under the action of the pressure cap 5. When the piston rod 2 abutting surface contacts the limiting surface 17 of the sleeve 4, it stops running. At this time, the buffering ends and the oil cylinder stops working. The next working cycle will start again.
[0041] Furthermore, because the outer circle of the piston rod 2 forms a cavity with the inner wall of the sleeve, to prevent a vacuum from forming during operation, an exhaust port 19 is arranged on the outer circle of the cylinder barrel 1 to connect with the atmosphere, such as... Figure 3 As shown, the oil pressure P is present from beginning to end, which can accurately ensure that the oil cylinder can return to its original state every time after it finishes working, thus solving the problem that the single-acting piston rod 2 cannot retract its full stroke.
[0042] In summary, this application integrates the through-hole 10, the first oil passage 11, the second oil passage 12, and the one-way valve 6 into the end of the piston rod 2, resulting in a compact hydraulic cylinder structure with minimal installation space requirements. This allows for wider application in space-constrained equipment. The buffer structure comprised of the through-hole 10, the first oil passage 11, the second oil passage 12, and the one-way valve 6 is simple in design. The inclusion of the one-way valve 6 within the piston rod 2 reduces the risk of cylinder leakage and lowers maintenance costs. This structure utilizes a combination of stable oil pressure P within the hydraulic cylinder and throttling for buffering, eliminating the need for elastic components and thus extending the structure's service life.
[0043] Furthermore, rubber sealing rings are provided between the guide sleeve 3 and the piston rod 2, and between the piston part 18 and the cylinder 1, forming a low-friction design to increase its sealing service life. The addition of the copper guide sleeve 3 allows the cylinder to withstand a larger lateral load, especially the load inherent in the stamping process in the stamping industry, so that the cylinder structure can maintain a long service life and precise rebound effect under high-frequency use conditions.
[0044] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.
Claims
1. A high-frequency hydraulic cylinder with a buffer structure, characterized in that, include, Cylinder (1), and A piston rod (2) is inserted into a cylinder (1). A rodless cavity (9) is formed between the piston rod (2) and the bottom of the cylinder (1). A piston part (18) is provided at the end of the piston rod (2) located in the cylinder (1). Guide sleeve (3), the guide sleeve (3) is disposed between cylinder (1) and piston rod (2), and a rod cavity (8) is formed between the guide sleeve (3) and piston part (18); The piston part (18) is provided with a through hole (10), and the piston rod (2) is provided with a first oil passage (11) and a second oil passage (12). The first oil passage (11) and the second oil passage (12) are both connected to the through hole (10). The second oil passage (12) is located on the side of the first oil passage (11) near the rodless chamber (9). A one-way valve (6) is provided in the second oil passage (12).
2. The high-frequency hydraulic cylinder with a buffer structure according to claim 1, characterized in that, The second oil passage (12) is provided in multiple ways along the circumference of the piston rod (2), and each second oil passage (12) is provided with a one-way valve (6).
3. The high-frequency hydraulic cylinder with a buffer structure according to claim 1, characterized in that, A sleeve (4) is provided inside the cylinder (1). The sleeve (4) is located between the piston rod (2) and the cylinder (1). The piston rod (2) and the sleeve (4) are slidably engaged. A limiting surface (17) is provided on the sleeve (4). The limiting surface (17) is set towards the bottom of the cylinder (1). An abutment surface that engages with the limiting surface (17) is provided on the piston rod (2).
4. The high-frequency hydraulic cylinder with a buffer structure according to claim 3, characterized in that, A pressure cap (5) is provided at the opening of the cylinder (1), and a fixing pin (7) is provided on the pressure cap (5). The fixing pin (7) passes through the pressure cap (5), the sleeve (4) and connects to the guide sleeve (3).
5. The high-frequency hydraulic cylinder with a buffer structure according to claim 1, characterized in that, A rod sealing ring (15) is provided between the guide sleeve (3) and the piston rod (2), and a static seal (14) is provided between the guide sleeve (3) and the cylinder (1).
6. The high-frequency hydraulic cylinder with a buffer structure according to claim 3, characterized in that, A dustproof ring is provided between the sleeve (4) and the piston rod (2).
7. The high-frequency hydraulic cylinder with a buffer structure according to claim 1, characterized in that, The cylinder (1) is provided with an exhaust port (19), which is connected to the gap between the sleeve (4) and the piston rod (2).
8. The high-frequency hydraulic cylinder with a buffer structure according to claim 1, characterized in that, A sealing ring (16) for a hole is provided between the piston part (18) and the cylinder (1).
9. The high-frequency hydraulic cylinder with a buffer structure according to claim 1, characterized in that, The guide sleeve (3) is made of copper.