Hydraulic oil cylinder buffering device with adjustable buffering speed

Abstract

The utility model provides a hydraulic oil cylinder buffering device with adjustable buffering speed, which comprises a cylinder barrel, a piston arranged in the cylinder barrel, a piston rod and an end cover sealed with the end part, a buffering ring is arranged at the stroke tail end of the piston rod in the end cover, a buffering sleeve matched with the buffering ring is arranged at the tail end of the piston rod, and a buffering gap is formed by a space clamped by the buffering ring and the buffering sleeve. A series channel is arranged on the outer surface of the buffer ring, penetrates through the length direction of the buffer ring and is used for communicating the buffer gap with a rod oil cavity in the cylinder barrel; a slow flow through hole is formed in the tail end of the buffer ring, the lower end of the adjustable buffer device penetrates through the series connection channel to be inserted into the slow flow through hole, and the adjustable buffer device moves in the radial direction of the buffer ring and is used for adjusting the size of the buffer gap. The end cover is further provided with an oil return channel communicated with the buffering gap, and the oil return channel is used for enabling oil to flow back to the oil tank. The problems that the buffering speed of a hydraulic oil cylinder buffering device is difficult to adjust, accurate control cannot be conducted according to different working conditions, and equipment is impacted are solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder buffer technology, and in particular to a hydraulic cylinder buffer device with adjustable buffer speed. Background Technology

[0002] Hydraulic cylinders are widely used in hydraulic systems. However, when the piston of a hydraulic cylinder reaches the end of its stroke, it often generates a large impact force, which can damage the cylinder itself and affect the stability and reliability of the entire hydraulic system. To solve this problem, a buffer device is usually installed in the hydraulic cylinder. During the normal working stroke of the hydraulic cylinder, hydraulic oil enters one chamber of the cylinder through the inlet, pushing the piston and piston rod to move and drive the load. At this time, the buffer device is basically not involved in the operation, and the flow of oil is relatively smooth to ensure that the hydraulic cylinder can output power efficiently.

[0003] When the hydraulic cylinder piston approaches the end of its stroke, the buffer device begins to function. Common buffer devices include throttle valves and buffer plungers. Throttle valves control the flow rate of hydraulic fluid by changing the cross-sectional area of ​​the channel through which the fluid flows, thereby adjusting the buffering speed. Buffer plungers, on the other hand, enter a specific buffer chamber when the piston approaches the end of its stroke. Buffering is achieved through the interaction with the chamber wall and the throttling effect of the hydraulic fluid. After the plunger enters the buffer chamber, the hydraulic fluid inside can only flow out through the narrow gap between the plunger and the chamber wall or through a specific throttling channel. Due to the increased resistance to fluid flow, the piston speed also decreases.

[0004] Although some hydraulic cylinder buffer devices exist, these devices often have the problem of difficulty in adjusting the buffer speed, and cannot meet the needs of different working conditions. Utility Model Content

[0005] The main purpose of this utility model is to provide a hydraulic cylinder buffer device with adjustable buffer speed, which solves the problem that the buffer speed of the hydraulic cylinder buffer device is difficult to adjust, cannot be accurately controlled for different working conditions, and causes impact on the equipment.

[0006] To solve the above technical problems, the technical solution adopted by this utility model is: a hydraulic cylinder buffer device with adjustable buffer speed, including a cylinder, a piston and piston rod disposed in the cylinder, and an end cap with end sealing. A buffer ring is provided at the end of the piston rod stroke inside the end cap, and a buffer sleeve adapted to the buffer ring is provided at the end of the piston rod. The space between the buffer ring and the buffer sleeve forms a buffer gap. A series channel is provided on the outer surface of the buffer ring. The series channel runs through the length direction of the buffer ring and is used to connect the buffer gap with the rod oil chamber inside the cylinder.

[0007] The buffer ring is provided with a slow flow hole at its tail end. The lower end of the adjustable buffer device passes through the series channel and is inserted into the slow flow hole. The adjustable buffer device moves radially along the buffer ring to adjust the size of the buffer gap.

[0008] The end cap is also provided with an oil return channel that communicates with the buffer gap, for returning oil to the oil tank.

[0009] In a preferred embodiment, the piston rod end is connected to the piston, and a buffer sleeve is fitted around the outer ring of the piston rod end and extends to the upper end of the piston. The outer diameter of the buffer sleeve is adapted to the inner diameter of the buffer ring.

[0010] In a preferred embodiment, one end of the buffer ring extends to the inner side of the cylinder at the lower end of the end cover, and the other end extends to the end of the piston rod stroke inside the end cover.

[0011] In a preferred embodiment, the adjustable buffer device includes a locking nut, an adjusting plunger, and a seal. The side wall of the end cap is provided with a threaded hole that matches the external thread at the lower end of the locking nut. The adjustable buffer device is threadedly connected to the end cap through the locking nut.

[0012] In the preferred embodiment, the lower end of the locking nut is connected to the upper end of the adjusting plunger, and the lower end of the adjusting plunger extends into the through hole below the threaded hole on the side wall of the end cover. The adjusting plunger has multiple sealing grooves in the middle, and multiple sealing elements are arranged in the sealing grooves, with their outer rings abutting against the inner wall of the through hole below the threaded hole.

[0013] In a preferred embodiment, a stepped surface is further provided below the central seal of the adjusting plunger to limit the radial movement range of the locking nut.

[0014] In a preferred embodiment, the through hole below the adjusting plunger is connected to the buffer gap through a slow flow hole to form a buffer flow channel;

[0015] The lower end of the adjusting plunger is provided with a plunger that matches the diameter of the slow flow hole. By rotating the locking nut, the plunger is driven to move up and down within the slow flow hole.

[0016] In a preferred embodiment, there is at least one adjustable buffer device, and each device corresponds to at least one slow-flow hole.

[0017] In a preferred embodiment, the side wall of the end cap is further provided with an oil return channel communicating with the buffer gap, the other end of the oil return channel is connected to the oil tank, and the oil return channel is further provided with an adjustment mechanism for adjusting the oil return speed in the buffer gap;

[0018] The regulating mechanism is a throttle valve or an overflow valve.

[0019] In the preferred embodiment, the adjusting mechanism on the return oil channel is a throttle valve, and a displacement sensor is provided on the adjustable buffer device. The displacement sensor is electrically connected to the throttle valve, and the opening degree of the throttle valve is adapted to the size of the buffer flow channel adjusted by at least one adjustable buffer device.

[0020] Alternatively, the regulating mechanism on the return oil channel is an overflow valve, and a pressure sensor is provided at one or more locations, such as the end of the piston rod stroke inside the end cover and the upper end face of the piston. The pressure sensor is electrically connected to the overflow valve, and the pressure limit of the overflow valve is less than the maximum pressure safety limit of each component of the hydraulic cylinder.

[0021] This invention provides a hydraulic cylinder buffer device with adjustable buffering speed, including a cylinder barrel, a piston and piston rod disposed within the cylinder barrel, and an end cap with end sealing. A buffer ring is fixed inside the end cap near the end of its stroke, and its inner diameter and the outer diameter of the buffer sleeve form a specific buffer gap near the end of the stroke. The surface of the buffer ring is provided with a series of interconnected flow channels of different diameters, with a through hole at the end of each channel. An adjusting plunger that mates with the through hole of the buffer ring is located at the end cap. By rotating the adjusting plunger, the diameter of the flow channel within the through hole at the end of the buffer ring can be changed, thereby adjusting the cross-sectional area between the buffer gap and the radial through hole of the buffer ring, achieving precise control of the buffer oil flow rate, and thus adjusting the buffering speed. A return oil channel connected to the internal oil cavity of the buffer sleeve is provided on the end cap wall, ensuring that the oil can flow back to the oil tank in an orderly manner during the buffering process, preventing oil pressure buildup from affecting the buffering effect. The buffering effect can be easily adjusted by adjusting the plunger to meet the needs of different working conditions. The buffer device has a simple structure, is easy to install and maintain, effectively reduces the impact force when the piston moves to the end of its stroke, reduces damage to the cylinder, and improves the service life of the hydraulic cylinder. The processing method adopts conventional processing equipment and processes, which is easy to implement and has a low cost. 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 cross-sectional view of the installation section of the adjustable buffer device for the hydraulic cylinder of this utility model;

[0024] Figure 2 This is a partial structural diagram of the adjustable buffer device of this utility model;

[0025] Figure 3 This is a cross-sectional view of the hydraulic cylinder return oil channel in Embodiment 2 of this utility model;

[0026] Figure 4 This is a partial structural diagram of the adjustable buffer device according to Embodiment 2 of this utility model;

[0027] Figure 5This is a cross-sectional view of the hydraulic cylinder return oil channel in Embodiment 3 of this utility model;

[0028] Figure 6 This is a partial structural diagram of the adjustable buffer device in Embodiment 3 of this utility model.

[0029] In the diagram: 1. Cylinder; 2. Piston; 3. Piston rod; 4. End cap; 5. Buffer ring; 501. Buffer flow hole; 6. Buffer sleeve; 7. Buffer gap; 8. Series channel; 9. Adjustable buffer device; 901. Locking nut; 902. Adjusting plunger; 903. Seal; 904. Plug; 10. Oil return channel; 11. Throttle valve; 12. Overflow valve; 13. Displacement sensor; 14. Pressure sensor; 15. Oil tank. Detailed Implementation

[0030] Example 1

[0031] like Figures 1-2 As shown, a hydraulic cylinder buffer device with adjustable buffer speed includes a cylinder 1, a piston 2 and a piston rod 3 disposed in the cylinder 1, and an end cap 4 with end sealing. A buffer ring 5 is provided at the end of the piston rod 3's stroke inside the end cap 4, and a buffer sleeve 6 adapted to the buffer ring 5 is provided at the end of the piston rod 3. The space between the buffer ring 5 and the buffer sleeve 6 forms a buffer gap 7. A series channel 8 is provided on the outer surface of the buffer ring 5. The series channel 8 extends through the length direction of the buffer ring 5 and is used to connect the buffer gap 7 with the rod oil chamber inside the cylinder 1.

[0032] The buffer ring 5 has a slow flow hole 501 at its tail end. The lower end of the adjustable buffer device 9 passes through the series channel 8 and is inserted into the slow flow hole 501. The adjustable buffer device 9 moves radially along the buffer ring 5 to adjust the size of the buffer gap 7.

[0033] The end cap 4 is also provided with an oil return channel 10 that communicates with the buffer gap 7, for returning oil to the oil tank.

[0034] This application mainly consists of a cylinder 1, a piston 2, a piston rod 3, and an end cap 4. A special gap buffer structure is provided at the buffer end of the end cap 4, including a buffer sleeve 6, a buffer ring 5, an adjusting plunger 902, and a seal 903. The buffer ring 5 is fixed inside the end cap 4 near the end of its stroke, and its inner diameter and the outer diameter of the buffer sleeve 6 form a specific buffer gap 7 near the end of the stroke. The surface of the buffer ring 6 is provided with a series of interconnected flow channels 8 of different diameters, and a slow-flow hole 501 is provided at the end of the flow channel. An adjusting plunger 902 is provided at the end cap 4 to cooperate with the slow-flow hole 501 of the buffer ring 5. By rotating the adjusting plunger 903, the size of the flow channel diameter in the slow-flow hole 501 at the end of the buffer ring 5 can be changed, thereby adjusting the cross-sectional area between the buffer gap 7 and the radial through hole of the buffer ring 5, achieving precise control of the buffer oil flow rate, and thus adjusting the buffering speed.

[0035] In a preferred embodiment, the piston rod 3 is connected to the piston 2 at its end, and the buffer sleeve 6 is fitted around the outer ring of the piston rod 3 and extends to the upper end of the piston 2. The outer diameter of the buffer sleeve 6 is adapted to the inner diameter of the buffer ring 5.

[0036] In a preferred embodiment, one end of the buffer ring 5 extends to the inner side of the cylinder 1 at the lower end of the end cover 4, and the other end extends to the end of the stroke of the piston rod 3 inside the end cover 4.

[0037] The length of the buffer ring 5 extends through the end stroke of the piston rod 3 inside the end cover 4, ensuring that the buffer device is always in the buffer working section at the end of the piston rod 3. Each component is manufactured using high-precision machining equipment to ensure the accuracy of the cylinder's inner diameter and fit.

[0038] In a preferred embodiment, the adjustable buffer device 9 includes a locking nut 901, an adjusting plunger 902, and a sealing element 903. The side wall of the end cover 4 is provided with a threaded hole that matches the external thread at the lower end of the locking nut 901. The adjustable buffer device 9 is threadedly connected to the end cover 4 through the locking nut 901.

[0039] In the preferred embodiment, the lower end of the locking nut 901 is connected to the upper end of the adjusting plunger 902. The lower end of the adjusting plunger 902 extends into the through hole below the threaded hole on the side wall of the end cover 4. The adjusting plunger 902 has multiple sealing grooves in the middle, and multiple sealing elements 903 are disposed in the sealing grooves, with their outer rings abutting against the inner wall of the through hole below the threaded hole.

[0040] In a preferred embodiment, a stepped surface is provided below the central seal 903 of the adjusting plunger 902 to limit the radial movement range of the locking nut 901.

[0041] In a preferred embodiment, the through hole below the adjusting plunger 902 is connected to the buffer gap 7 through the slow flow hole 501 to form a buffer flow channel;

[0042] The lower end of the adjusting plunger 902 is provided with a plunger 904 that is adapted to the diameter of the slow flow hole 501. By rotating the locking nut 901, the plunger 904 is driven to move up and down within the slow flow hole 501.

[0043] In a preferred embodiment, the adjustable buffer device 9 is at least one and corresponds one-to-one with at least one buffer flow hole 501.

[0044] The adjustable buffer device 9 has a simple structure and is easy to process. When in use, the size of the buffer gap 7 between the buffer ring 5 and the buffer sleeve 6 can be adjusted by turning the lock nut 901 left or right through the hexagonal wrench hole at the end, thereby controlling the size of the hydraulic cylinder buffer speed. The adjusting plunger 902 is provided with a sealing groove to ensure that there is no oil leakage when the adjusting plunger 902 is assembled with the end cover 4.

[0045] In a preferred embodiment, the side wall of the end cap 4 is also provided with an oil return channel 10 communicating with the buffer gap 7. The other end of the oil return channel 10 is connected to the oil tank 15. The oil return channel 10 is also provided with an adjustment mechanism for adjusting the oil return speed in the buffer gap 7.

[0046] The regulating mechanism is either a throttle valve 11 or an overflow valve 12.

[0047] An oil return channel 10 is provided on the end cap 4 wall, which is connected to the oil cavity inside the buffer sleeve 6, to ensure that the oil can flow back to the oil tank 15 in an orderly manner during the buffering process, and to avoid the oil pressure affecting the buffering effect.

[0048] Example 2

[0049] Further explanation in conjunction with Example 1, such as Figures 1-4 As shown in the structure, the adjustment mechanism on the oil return channel 10 is a throttle valve 11, and a displacement sensor 13 is provided on the adjustable buffer device 9. The displacement sensor 13 is electrically connected to the throttle valve 11, and the opening degree of the throttle valve 11 is adapted to the size of the buffer flow channel adjusted by at least one adjustable buffer device 9.

[0050] The rotation adjustment height of the adjustable buffer device 9 is monitored by the displacement sensor 13, thereby calculating the cross-sectional area of ​​the connection between the buffer gap 7 and the radial through hole of the buffer ring 5. Information is exchanged with the throttle valve 11 through the communication device, so that the throttle valve 11 allows the buffer return oil with a matching flow rate to ensure that the oil can flow back to the oil tank in an orderly manner during the buffering process, and avoid the oil pressure from affecting the buffering effect.

[0051] Example 3

[0052] Further explanation in conjunction with Example 1, such as Figures 1-2 As shown in Figures 5-6, the regulating mechanism on the oil return channel 10 is an overflow valve 12. A pressure sensor 14 is provided at one or more of the following locations: the end of the piston rod 3 inside the end cover 4, and the upper end face of the piston 2. The pressure sensor 14 is electrically connected to the overflow valve 12. The pressure limit of the overflow valve 12 is less than the maximum pressure safety limit of each component of the hydraulic cylinder.

[0053] The pressure sensor 14 detects the compressive stress at the point or multiple pressure points with the lowest pressure intensity in the hydraulic cylinder and exchanges information with the relief valve 12. When the buffer pressure formed by the piston rod 3 at the end of its stroke exceeds the durability limit of the device, the relief valve 12 is controlled to release an appropriate amount of buffer oil to avoid damaging the buffer device of this application and affecting the buffering effect.

[0054] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A hydraulic cylinder buffer device with adjustable buffer speed, comprising a cylinder (1), a piston (2) and a piston rod (3) disposed within the cylinder (1), and an end cap (4) with end sealing, characterized in that: A buffer ring (5) is provided at the end of the stroke of the piston rod (3) inside the end cap (4). A buffer sleeve (6) adapted to the buffer ring (5) is provided at the end of the piston rod (3). The space between the buffer ring (5) and the buffer sleeve (6) forms a buffer gap (7). A series channel (8) is provided on the outer surface of the buffer ring (5). The series channel (8) runs through the length direction of the buffer ring (5) and is used to connect the buffer gap (7) with the rod oil chamber inside the cylinder (1). The buffer ring (5) has a slow flow hole (501) at its tail end. The lower end of the adjustable buffer device (9) passes through the series channel (8) and is inserted into the slow flow hole (501). The adjustable buffer device (9) moves radially along the buffer ring (5) to adjust the size of the buffer gap (7). The end cap (4) is also provided with an oil return channel (10) that communicates with the buffer gap (7) for returning oil to the oil tank.

2. The hydraulic cylinder buffer device with adjustable buffer speed according to claim 1, characterized in that: The piston rod (3) is connected to the piston (2) at its end. The buffer sleeve (6) is fitted on the outer ring of the piston rod (3) and extends to the upper end of the piston (2). The outer diameter of the buffer sleeve (6) is matched with the inner diameter of the buffer ring (5).

3. The hydraulic cylinder buffer device with adjustable buffer speed according to claim 2, characterized in that: One end of the buffer ring (5) extends to the inner side of the cylinder (1) at the lower end of the end cover (4), and the other end extends to the end of the piston rod (3) inside the end cover (4).

4. The hydraulic cylinder buffer device with adjustable buffer speed according to claim 1, characterized in that: The adjustable buffer device (9) includes a locking nut (901), an adjusting plunger (902) and a sealing element (903). The side wall of the end cover (4) is provided with a threaded hole that matches the lower external thread of the locking nut (901). The adjustable buffer device (9) is threadedly connected to the end cover (4) through the locking nut (901).

5. The hydraulic cylinder buffer device with adjustable buffer speed according to claim 4, characterized in that: The lower end of the locking nut (901) is connected to the upper end of the adjusting plunger (902). The lower end of the adjusting plunger (902) extends into the through hole below the threaded hole on the side wall of the end cover (4). The adjusting plunger (902) has multiple sealing grooves in the middle. Multiple sealing elements (903) are set in the sealing grooves, and their outer rings abut against the inner wall of the through hole below the threaded hole.

6. The hydraulic cylinder buffer device with adjustable buffer speed according to claim 4, characterized in that: The adjusting plunger (902) is further provided with a stepped surface below the central seal (903) to limit the radial movement range of the locking nut (901).

7. The hydraulic cylinder buffer device with adjustable buffer speed according to claim 4, characterized in that: The through hole below the adjusting plunger (902) is connected to the buffer gap (7) through the slow flow hole (501) to form a buffer flow channel; The lower end of the adjusting plunger (902) is provided with a plunger (904) that is adapted to the diameter of the slow flow hole (501). By rotating the locking nut (901), the plunger (904) is driven to move up and down in the slow flow hole (501).

8. A hydraulic cylinder buffer device with adjustable buffer speed according to any one of claims 1, 4 to 7, characterized in that: The adjustable buffer device (9) is at least one and corresponds one-to-one with at least one slow flow hole (501).

9. The hydraulic cylinder buffer device with adjustable buffer speed according to claim 1, characterized in that: The side wall of the end cap (4) is also provided with an oil return channel (10) that communicates with the buffer gap (7). The other end of the oil return channel (10) is connected to the oil tank (15). The oil return channel (10) is also provided with an adjustment mechanism for adjusting the oil return speed in the buffer gap (7). The regulating mechanism is a throttle valve (11) or an overflow valve (12).

10. A hydraulic cylinder buffer device with adjustable buffer speed according to claim 9, characterized in that: The adjustment mechanism on the return oil channel (10) is a throttle valve (11). A displacement sensor (13) is provided on the adjustable buffer device (9). The displacement sensor (13) is electrically connected to the throttle valve (11). The opening of the throttle valve (11) is adapted to the size of the buffer flow channel adjusted by at least one adjustable buffer device (9). Alternatively, the regulating mechanism on the return oil channel (10) is an overflow valve (12), and a pressure sensor (14) is provided at one or more of the following locations: the end of the piston rod (3) inside the end cover (4) and the upper end face of the piston (2). The pressure sensor (14) is electrically connected to the overflow valve (12), and the pressure limit of the overflow valve (12) is less than the maximum pressure safety limit of each component of the hydraulic cylinder.

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