Double rod cylinder with buffer structure

Abstract

The application relates to the technical field of hydraulic cylinder buffer structures, and particularly relates to a double-rod oil cylinder with a buffer structure, which comprises a cylinder barrel, a guide sleeve, a piston rod, a piston and a buffer ring. The guide sleeve is arranged at the two ends of the cylinder barrel, and the guide sleeve is provided with a mounting groove. The piston rod penetrates through the guide sleeve and the cylinder barrel, and the piston rod is provided with the piston. The piston is located in the cylinder barrel. The buffer ring is coaxially arranged on the piston rod, and the buffer ring is arranged in the mounting groove in a floating mode along the cylinder barrel axis. One end of the buffer ring is used for abutting against the bottom surface of the mounting groove, and the other end is used for abutting against the end surface of the cylinder barrel. The buffer ring is provided with a throttle hole opposite to the bottom surface of the mounting groove. The oil port is arranged on the guide sleeve, and the oil port is located on the side of the buffer ring away from the cylinder barrel. The floating buffer ring and the throttle hole are arranged, so that the buffer ring, the cylinder barrel and the guide sleeve realize the function of a one-way valve. In cooperation with the assembly gap between the buffer ring and the piston rod, the piston rod is rapidly started and reset.

Description

Technical Field

[0001] This application relates to the field of hydraulic cylinder buffer structure technology, and in particular to a double-rod hydraulic cylinder with a buffer structure. Background Technology

[0002] In a double-rod hydraulic cylinder, the piston rod can extend in two opposite directions. Double-rod hydraulic cylinders generally have a shorter piston rod stroke and a faster rod extension speed, thus requiring high buffering capacity.

[0003] In existing double-rod hydraulic cylinders, the buffer sleeve is usually fixed to the piston rod or integrated with the piston rod, which cannot be adaptively adjusted. This places high demands on the machining of the hydraulic cylinder, especially when the difference between the cylinder rod diameter and the cylinder diameter is small, the buffer structure cannot be arranged and the machining is extremely difficult. Furthermore, during the high-speed movement of the piston, the buffer sleeve experiences significant wear, resulting in uneven wear and making it prone to cylinder collision and failure. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing double-rod hydraulic cylinder buffer sleeve cannot be adaptively adjusted, and the wear of the buffer sleeve is large during the high-speed movement of the piston, which easily leads to cylinder collision and failure.

[0005] Therefore, this utility model provides a double-rod hydraulic cylinder with a buffer structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A double-rod hydraulic cylinder with a buffer structure includes,

[0008] Cylinder, and

[0009] Guide sleeves are provided at both ends of the cylinder barrel, and mounting grooves are provided on the guide sleeves or the cylinder barrel;

[0010] A piston rod, which passes through a guide sleeve and a cylinder, and a piston is mounted on the piston rod, with the piston located inside the cylinder;

[0011] A buffer ring is coaxially sleeved on the piston rod. The buffer ring is floatingly disposed in the mounting groove along the cylinder axial direction. The buffer ring is provided with a throttling orifice, which is opposite to the bottom surface of the mounting groove on the side away from the piston.

[0012] The oil port is located on the guide sleeve, on the side of the buffer ring away from the piston.

[0013] Furthermore, the guide sleeve is also provided with a limiting groove and an oil groove. The limiting groove and the oil groove are respectively provided on both sides of the mounting groove on the guide sleeve along the axial direction of the cylinder and are connected to the mounting groove. The oil groove is connected to the oil port. The cylinder is inserted into the guide sleeve through the limiting groove.

[0014] Furthermore, the sidewall of the oil trough is inclined away from the piston rod at the end near the mounting groove.

[0015] Furthermore, an O-ring is provided between the side wall of the limiting groove and the cylinder.

[0016] Furthermore, the piston rod portions on both sides of the piston are symmetrically provided with a first step portion and a second step portion. The outer diameter of the piston rod at the first step portion is larger than the outer diameter of the piston rod end, and the outer diameter of the piston rod at the second step portion is larger than the outer diameter of the piston rod at the first step portion.

[0017] Furthermore, when the first stepped portion abuts against the bottom surface of the oil tank, the first stepped portion is opposite to the oil port, and there is a gap H between the outer wall of the first stepped portion and the side wall of the oil tank; the second stepped portion is opposite to the buffer ring, and there is a gap h between the outer wall of the second stepped portion and the buffer ring.

[0018] Furthermore, a transition surface is provided between the first step portion and the second step portion, the transition surface connecting the outer wall of the first step portion and the outer wall of the second step portion, and the transition surface is an inclined surface.

[0019] Furthermore, the two guide sleeves are fixed together by bolts and nuts, with the bolts passing through both guide sleeves and connecting to the nuts.

[0020] Furthermore, the piston rod is hollow.

[0021] The beneficial effects of this utility model are as follows: This application sets up a floating buffer ring with a throttling orifice on it, enabling the buffer ring, cylinder, and guide sleeve to function as a one-way valve. Oil can only enter the cavity from the oil port through the throttling orifice on the buffer ring, but cannot return to the oil port through the orifice, thus achieving rapid oil entry into the cavity and rapid start-up. During the piston rod's buffering process, oil cannot pass through the throttling orifice but flows through the installation gap between the floating buffer ring and the piston rod, generating damping and providing buffering for the piston rod. In summary, this buffer ring has a simple structure and is easy to manufacture; the buffering effect and the one-way rapid flow effect are achieved only by varying the position of the buffer ring. 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 structure of the double-rod hydraulic cylinder in this utility model.

[0024] Figure 2 This is a schematic diagram of the hollow piston rod buffer structure in this utility model.

[0025] In the diagram: 1. Cylinder; 2. Guide sleeve; 3. Buffer ring; 4. Piston rod; 5. Guide ring; 6. Bolt; 7. Hole seal; 8. O-ring; 9. Retaining ring; 10. Nut; 11. Throttling orifice; 12. Limiting groove; 13. Mounting groove; 14. Oil groove; 15. Oil port; 16. Piston; 17. First step; 18. Second step. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] A double-rod hydraulic cylinder with a buffer structure includes a cylinder barrel 1, two guide sleeves 2, and a piston rod 4. The two guide sleeves 2 are respectively fixedly disposed at both ends of the cylinder barrel 1. Further, referring to... Figure 1The two guide sleeves 2 are fixed together by bolts 6 (which can be hexagonal head bolts 6) and nuts 10 (hexagonal nuts 10). The bolts 6 pass through the two guide sleeves 2 and connect to the nuts 10. The piston rod 4 passes through the cylinder 1 and the two guide sleeves 2 and slides along the axial direction of the cylinder 1. A piston 16 is coaxially mounted on the piston rod 4. The piston 16 is located inside the cylinder 1 and slides against the inner wall of the cylinder 1. A sealing ring 7 and a guide ring 5 are provided between the piston 16 and the inner wall of the cylinder 1. It should be noted that the piston rod 4 is hollow.

[0030] The two guide sleeves 2 have the same connection structure with the cylinder 1 and are symmetrically arranged with respect to the axis of the cylinder 1. The two ends of the piston rod 4 are symmetrically arranged with the piston 16 as the center. Each guide sleeve 2 is provided with a buffer ring 3 between it and the cylinder 1. The buffer ring 3 is made of cast iron or copper and floats along the cylinder axial direction inside the cylinder 1 or the guide sleeve 2. The inner side wall of the cylinder 1 or the guide sleeve 2 is provided with a mounting groove 13 for installing the buffer ring 3. Taking the structure of the guide sleeve 2, cylinder 1, and piston rod 4 on the left side of the piston 16 as an example:

[0031] Reference Figure 2 In this embodiment, the guide sleeve 2 is provided with a limiting groove 12, an installation groove 13 and an oil groove 14. The installation groove 13 is located at the bottom of the limiting groove 12, and the oil groove 14 is located at the bottom of the installation groove 13. The guide sleeve 2 is sleeved on the end of the cylinder 1 through the limiting groove 12. An O-ring 8 and a retaining ring 9 are provided between the side wall of the limiting groove 12 and the cylinder 1. The end face of the cylinder 1 abuts against the bottom surface of the limiting groove 12. The buffer ring 3 is located in the installation groove 13. The buffer ring 3 is sleeved on the piston rod 4 and slides with the piston rod 4 along its axial direction. The axial thickness of the buffer ring 3 is less than the depth of the installation groove 13. The buffer ring 3 floats along the axial direction of the cylinder 1 in the installation groove 13. It should be noted that the outer part of the cylinder barrel 1 end face abuts against the bottom of the limiting groove 12. A throttling orifice 11 is provided on the buffer ring 3 along its axial direction, penetrating the buffer ring 3. Multiple throttling orifices 11 are provided along the circumference of the buffer ring 3, communicating with the internal cavity of the cylinder barrel 1, and facing the bottom surface of the mounting groove 13. An oil port 15 is provided on the guide sleeve 2, communicating with the oil groove 14. Furthermore, the side wall of the oil groove 14, near the mounting groove 13, is inclined away from the piston rod 4, thereby increasing the contact surface between the buffer ring 3 and the oil when oil enters through the oil port 15.

[0032] The piston rod 4 on both sides of the piston 16 is symmetrically provided with a first step 17 and a second step 18. The first step 17 and the second step 18 are integrally formed with the piston rod 4. The outer diameter of the piston rod 4 at the first step 17 is larger than the outer diameter of the end of the piston rod 4, and the outer diameter of the piston rod 4 at the second step 18 is larger than the outer diameter of the piston rod 4 at the first step 17. A transition surface is provided between the first step 17 and the second step 18, connecting the outer wall of the first step 17 and the outer wall of the second step 18. The transition surface is an inclined surface. The first step 17 is located on the side of the second step 18 away from the piston 16. When the first step 17 abuts against the bottom surface of the oil groove 14, the first step 17 is opposite to the oil port 15, and there is a gap H between the outer wall of the first step 17 and the side wall of the oil groove 14. The second step 18 is opposite to the buffer ring 3, and there is a gap h between the outer wall of the second step 18 and the buffer ring 3.

[0033] The implementation principle of this application is as follows:

[0034] When the oil enters the cylinder from the right-side oil port 15, the oil pushes the buffer ring 3 against the cylinder barrel 1, separating the buffer ring 3 from the bottom surface of the mounting groove 13. The oil then enters the inner cavity of the cylinder barrel 1 through the throttling hole 11 on the buffer ring 3. If the oil needs to flow back, it pushes the buffer ring 3 towards the bottom surface of the mounting groove 13. At this time, the end face of the buffer ring 3 abuts against the bottom surface of the mounting groove 13, and the throttling hole 11 is blocked, thus preventing the oil from flowing back. In this way, the buffer ring 3, the cylinder barrel 1, and the guide sleeve 2 together function as a one-way valve, enabling the oil to quickly enter the cavity and start up quickly.

[0035] When the piston rod 4 moves to the buffer stroke, the inner hole of the buffer ring 3 contacts the outer circle on the second step 18 of the piston rod 4, forming an annular cavity. The oil returns to the oil port 15 from this cavity, creating a buffering effect. The buffering effect varies depending on the gap. At this time, due to the action of the pressure oil, the buffer ring 3 is tightly fitted to the end face of the guide sleeve 2, and the oil cannot pass through the through hole on the buffer ring 3, thus forming a high degree of sealing.

[0036] The buffer structure of this invention is mainly used in double-rod hydraulic cylinders, especially when the difference between the cylinder diameter and the rod diameter is relatively small, where the effect is even better. For example, in a cylinder with a hollow piston rod 4, where the piston rod 4 is relatively thin, the piston rod 4 needs to ensure both strength and buffering effect. Unaffected by the wall thickness of the piston rod 4, a special buffer ring 3 is placed on the end cap, achieving a floating and adjustable buffering mechanism. Different buffering effects can be achieved by quickly replacing the buffer ring 3 under different operating conditions; alternatively, different annular cross-sections can be machined on the piston rod 4 to adjust the buffering pressure and improve the cylinder's service life.

[0037] 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 double-rod hydraulic cylinder with a buffer structure, characterized in that, include, Cylinder (1), and Guide sleeve (2), the guide sleeve (2) is disposed at both ends of cylinder (1), and the guide sleeve (2) or cylinder (1) is provided with mounting groove (13); A piston rod (4) passes through a guide sleeve (2) and a cylinder (1). A piston (16) is provided on the piston rod (4) and the piston (16) is located inside the cylinder (1). A buffer ring (3) is coaxially sleeved on the piston rod (4). The buffer ring (3) is floatingly disposed in the mounting groove (13) along the cylinder (1) axis. A throttle hole (11) is provided on the buffer ring (3). The throttle hole (11) is opposite to the bottom surface of the mounting groove (13) on the side away from the piston (16). Oil port (15) is provided on the guide sleeve (2) and is located on the side of the buffer ring (3) away from the piston (16).

2. The double-rod hydraulic cylinder with a buffer structure according to claim 1, characterized in that, The guide sleeve (2) is also provided with a limiting groove (12) and an oil groove (14). The limiting groove (12) and the oil groove (14) are respectively arranged on both sides of the mounting groove (13) on the guide sleeve (2) along the axial direction of the cylinder (1) and are connected to the mounting groove (13). The oil groove (14) is connected to the oil port (15). The cylinder (1) is inserted into the guide sleeve (2) through the limiting groove (12).

3. The double-rod hydraulic cylinder with a buffer structure according to claim 2, characterized in that, The side wall of the oil tank (14) is inclined away from the piston rod (4) at the end near the mounting groove (13).

4. The double-rod hydraulic cylinder with a buffer structure according to claim 2, characterized in that, An O-ring (8) is provided between the side wall of the limiting groove (12) and the cylinder (1).

5. The double-rod hydraulic cylinder with a buffer structure according to claim 1, characterized in that, The piston rod (4) on both sides of the piston (16) is symmetrically provided with a first step (17) and a second step (18). The outer diameter of the piston rod (4) at the first step (17) is larger than the outer diameter of the end of the piston rod (4), and the outer diameter of the piston rod (4) at the second step (18) is larger than the outer diameter of the piston rod (4) at the first step (17).

6. The double-rod hydraulic cylinder with a buffer structure according to claim 5, characterized in that, When the first step (17) abuts against the bottom surface of the oil tank (14), the first step (17) is opposite to the oil port (15), and there is a gap H between the outer wall of the first step (17) and the side wall of the oil tank (14). The second step (18) is opposite to the buffer ring (3), and there is a gap h between the outer wall of the second step (18) and the buffer ring (3).

7. The double-rod hydraulic cylinder with a buffer structure according to claim 5, characterized in that, A transition surface is provided between the first step portion (17) and the second step portion (18), the transition surface connecting the outer wall of the first step portion (17) and the outer wall of the second step portion (18), and the transition surface is an inclined surface.

8. The double-rod hydraulic cylinder with a buffer structure according to claim 1, characterized in that, The two guide sleeves (2) are fixed together by bolts (6) and nuts (10), the bolts (6) passing through the two guide sleeves (2) and connecting to the nuts (10).

9. The double-rod hydraulic cylinder with a buffer structure according to claim 1, characterized in that, The piston rod (4) is hollow.

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