Damping device for piston rod of hydraulic oil cylinder

Abstract

The utility model discloses a damping device for a piston rod of a hydraulic oil cylinder, which belongs to the technical field of hydraulic oil cylinders and comprises a hydraulic oil cylinder body, the piston rod is assembled at the top of the hydraulic oil cylinder body, a damping sleeve is arranged at the top end of the piston rod, a sliding rod is arranged in the damping sleeve, sliding sleeves are arranged at two ends of the sliding rod, and a push rod is arranged at the top of each sliding sleeve. A sliding pressing column is arranged at the top of the push rod, through grooves are formed in the two ends of the sliding rod, first damping cylinders are arranged in the through grooves, and first buffer springs are arranged outside the two ends of the sliding rod in a sleeving mode. The piston rod is arranged in the cavity to push the piston to compress or dilute air in the cavity, and the compressed air is slowly exhausted or sucked in by matching with the air holes with smaller inner diameters, so that the buffering effect is improved, the vibration frequency is effectively reduced, the efficient damping effect is achieved, the piston rod is prevented from being influenced by vibration, and the stable operation of the piston rod is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic oil cylinders, and particularly relates to a shock absorbing device for a piston rod of a hydraulic oil cylinder. Background Art

[0002] Hydraulic cylinder is a kind of pressure finishing process. It uses the cold plasticity of metal at room temperature and applies a certain pressure to the workpiece surface with a rolling tool to make the surface metal of the workpiece produce plastic flow and fill into the original residual concave trough, thereby reducing the surface roughness of the workpiece. Due to the plastic deformation of the rolled surface metal, the surface tissue is cold hardened and the grains are refined to form a dense fibrous shape, and a residual stress layer is formed, the hardness and strength are increased, thereby improving the wear resistance, corrosion resistance and compatibility of the workpiece surface.

[0003] At present, the existing hydraulic cylinder is generally connected to the external equipment through the piston rod. The vibration generated by the external equipment will be directly transmitted to the piston rod, and the piston rod will also vibrate. If it is subjected to severe vibration for a long time, it is easy to cause the piston rod to deform, resulting in the piston rod being unable to be used normally. For this reason, we propose a shock absorbing device for the piston rod of a hydraulic cylinder. Utility Model Content

[0004] The purpose of the utility model is to provide a shock absorbing device for a hydraulic cylinder piston rod to solve the existing problems raised in the above background technology.

[0005] The top of described sliding panel also is provided with an interlocking structure, and the interlocking structure of described sliding panel also is provided with an interlocking structure.

[0006] Preferably, a cavity is provided inside the first shock absorber cylinder, a piston is provided inside the cavity, a pressure rod is provided on the top of the piston, the top of the pressure rod passes through the cavity and is fixedly connected to the bottom of the sliding pressure column, and an air hole is provided at the bottom of the cavity, which is connected to the outside of the cavity.

[0007] Preferably, a limiting block is provided at the bottom of the sliding sleeve, a limiting groove is provided on the inner bottom surface of the shock-absorbing sleeve, and the limiting block extends into the interior of the limiting groove and is slidably connected to the inner wall thereof.

[0008] Preferably, a plurality of second buffer springs are further provided inside the shock-absorbing sleeve, and two ends of the second buffer springs are fixedly connected to the inner bottom surface of the shock-absorbing sleeve and the bottom of the sliding pressure column respectively.

[0009] Preferably, a second shock-absorbing cylinder is provided inside the second buffer spring, and the internal structure of the second shock-absorbing cylinder is exactly the same as that of the first shock-absorbing cylinder. The bottom of the second shock-absorbing cylinder is fixedly connected to the inner bottom surface of the shock-absorbing sleeve, and the top of the top pressure rod of the second shock-absorbing cylinder is fixedly connected to the sliding pressure column.

[0010] Preferably, limiting protrusions are provided around the bottom end of the sliding pressure column, and limiting sliding grooves are provided on the inner walls around the inner periphery of the shock-absorbing sleeve, and the limiting protrusions extend into the interior of the limiting sliding groove and are slidably connected to the inner wall thereof.

[0011] Preferably, a connecting ring is provided on the top of the sliding pressure column, and the connecting ring is fixedly installed on the top of the sliding pressure column by welding.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. When the sliding pressure column is subjected to vibration, the pressure or tension generated on the push rod is converted into the movement of the sliding sleeve on the sliding rod, and the first buffer spring is used to play a buffering role. At the same time, the pressure rod is pushed to push the piston to slide in the cavity inside the first shock absorber cylinder, compressing or diluting the air inside it. With the help of the air hole with a smaller inner diameter, the compressed air is slowly discharged or inhaled, thereby improving the buffering effect. In this process, the vibration frequency can be effectively reduced, achieving the effect of efficient shock absorption, avoiding the piston rod from being affected by vibration, and ensuring its stable operation.

[0014] 2. By arranging a second buffer spring and a second shock-absorbing cylinder around the inside of the shock-absorbing sleeve, the buffering and shock-absorbing effect is improved, the stability of the buffering and shock-absorbing effect is ensured, the effect of efficient shock absorption is achieved, the piston rod is prevented from being affected by vibration, and its stable operation is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the shock-absorbing sleeve of the present utility model;

[0017] Figure 3 For the utility model Figure 2 Middle A is a schematic diagram of the enlarged structure;

[0018] Figure 4 This is a schematic diagram of the slide bar structure of the present utility model;

[0019] Figure 5 This is a schematic structural diagram of the first shock-absorbing cylinder of the present utility model.

[0020] In the figure: 1. Hydraulic cylinder body; 2. Piston rod; 3. Shock-absorbing sleeve; 4. Sliding pressure column; 5. Connecting ring; 6. Limiting protrusion; 7. Limiting slide groove; 8. Sliding rod; 9. Through groove; 10. First shock-absorbing cylinder; 11. First buffer spring; 12. Sliding sleeve; 13. Push rod; 14. Movable connecting seat; 15. Second buffer spring; 16. Second shock-absorbing cylinder; 17. Cavity; 18. Piston; 19. Pressure rod; 20. Air hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-5 The utility model provides a technical solution of a shock absorbing device for a hydraulic cylinder piston rod: it includes a hydraulic cylinder body 1, a shock absorbing sleeve 3 and a first shock absorbing cylinder 10. The top of the hydraulic cylinder body 1 is equipped with a piston rod 2, and the top of the piston rod 2 is fixedly installed with a shock absorbing sleeve 3 by welding. Slide rods 8 are installed parallel to both sides of the shock absorbing sleeve 3. Both ends of the slide rod 8 are slidably provided with a sliding sleeve 12. The top of the sliding sleeve 12 is movably provided with a push rod 13. The top of the push rod 13 is provided with a sliding pressure column 4. The two ends of the push rod 13 are movably connected to the sliding pressure column 4 and the sliding sleeve 12 respectively through a movable connecting seat 14. The two ends of the slide rod 8 are horizontally provided with a through groove 9. The through groove 9 is provided with a first shock absorbing cylinder 10. The two ends of the first shock absorbing cylinder 10 are respectively fixedly connected to the inner wall of one end of the through groove 9 and the middle part of the sliding sleeve 12. The outside of both ends of the slide rod 8 is provided with a first buffer spring 11, and the two ends of the first buffer spring 11 are fixedly connected to the middle partition of the slide rod 8 and the sliding sleeve 12 respectively.

[0023] Specifically, a cavity 17 is provided inside the first shock absorber cylinder 10, a piston 18 is provided inside the cavity 17, a pressure rod 19 is provided on the top of the piston 18, the top of the pressure rod 19 passes through the cavity 17 and is fixedly connected to the bottom of the sliding pressure column 4, and an air hole 20 is provided at the bottom of the cavity 17, which is connected to the outside of the cavity 17.

[0024] Specifically, a limiting block is provided at the bottom of the sliding sleeve 12, and a limiting groove is provided on the inner bottom surface of the shock-absorbing sleeve 3. The limiting block extends into the interior of the limiting groove and is slidably connected to the inner wall thereof.

[0025] Specifically, a plurality of second buffer springs 15 are further provided inside the shock-absorbing sleeve 3 , and two ends of the second buffer springs 15 are fixedly connected to the inner bottom surface of the shock-absorbing sleeve 3 and the bottom of the sliding pressure column 4 respectively.

[0026] Specifically, a second shock absorber cylinder 16 is provided inside the second buffer spring 15. The internal structure of the second shock absorber cylinder 16 is exactly the same as that of the first shock absorber cylinder 10. The bottom of the second shock absorber cylinder 16 is fixedly connected to the inner bottom surface of the shock absorbing sleeve 3, and the top of the top pressure rod 19 of the second shock absorber cylinder 16 is fixedly connected to the sliding pressure column 4.

[0027] Specifically, limiting protrusions 6 are provided around the bottom end of the sliding pressure column 4, and limiting sliding grooves 7 are provided on the inner walls around the inner periphery of the shock absorbing sleeve 3. The limiting protrusions 6 extend into the interior of the limiting sliding grooves 7 and are slidably connected to the inner walls thereof.

[0028] Specifically, a connecting ring 5 is provided on the top of the sliding pressure column 4 , and the connecting ring 5 is fixedly installed on the top of the sliding pressure column 4 by welding.

[0029] In this embodiment, during use, when the hydraulic cylinder body 1 drives the piston rod 2 to drive the connected external device through the connecting ring 5, when the external device is subjected to external force and vibrates, the vibration is transmitted to the sliding pressure column 4 through the connecting ring 5. The sliding pressure column 4 slides with the inner wall of the shock-absorbing sleeve 3 under the action of the limiting protrusion 6 and the limiting slide groove 7. During the sliding of the sliding pressure column 4, pressure is applied to the push rod 13. The push rod 13 pushes the sliding sleeve 12 to move along the trajectory of the sliding rod 8 through the movable connecting seats 14 at both ends, so that the first buffer spring 11 is compressed and contracts, and at the same time pushes the pressure rod 19 on the first shock-absorbing cylinder 10. The pressure rod 19 is used to push the piston 18 to slide inside the cavity 17. Under the action of the piston 18, the air at the bottom end of the cavity 17 is compressed, and the compressed air is discharged from the air hole 20. Since the inner diameter of the air hole 20 is small, the compressed air cannot be discharged quickly and accumulates inside the cavity 17, and exerts a reverse effect on the piston 18, thereby achieving the purpose of buffering, thereby attenuating the vibration, slowing down the vibration frequency, and achieving the purpose of shock absorption. In combination with the second buffer spring 15 and the second shock absorber cylinder 16, the shock absorption effect is improved, the vibration is prevented from being transmitted to the piston rod 2, and the stable operation of the piston rod 2 is ensured.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shock absorbing device for a hydraulic cylinder piston rod, comprising a hydraulic cylinder body (1), a shock absorbing sleeve (3) and a first shock absorbing cylinder (10), characterized in that: The top of the hydraulic cylinder body (1) is equipped with a piston rod (2), the top of the piston rod (2) is fixedly mounted with a shock-absorbing sleeve (3) by welding, and sliding rods (8) are mounted in parallel on both sides of the interior of the shock-absorbing sleeve (3), and both ends of the sliding rod (8) are slidably provided with sliding sleeves (12), and the top of the sliding sleeve (12) is movably provided with a push rod (13), and the top of the push rod (13) is provided with a sliding pressure column (4), and the two ends of the push rod (13) are respectively connected to the sliding sleeve through a movable connecting seat (14). The dynamic pressure column (4) and the sliding sleeve (12) are movably connected, and a through groove (9) is transversely opened at both ends of the sliding rod (8), and a first shock-absorbing cylinder (10) is arranged inside the through groove (9). The two ends of the first shock-absorbing cylinder (10) are respectively fixedly connected to the inner wall of one end of the through groove (9) and the middle of the sliding sleeve (12). The outside of both ends of the sliding rod (8) is provided with a first buffer spring (11), and the two ends of the first buffer spring (11) are respectively fixedly connected to the middle partition of the sliding rod (8) and the sliding sleeve (12).

2. A shock absorbing device for a hydraulic cylinder piston rod according to claim 1, characterized in that: A cavity (17) is provided inside the first shock-absorbing cylinder (10), a piston (18) is provided inside the cavity (17), a pressure rod (19) is provided on the top of the piston (18), the top of the pressure rod (19) passes through the cavity (17) and is fixedly connected to the bottom of the sliding pressure column (4), and an air hole (20) is provided at the bottom of the cavity (17), and the air hole (20) is communicated with the outside of the cavity (17).

3. The shock absorbing device for a hydraulic cylinder piston rod according to claim 1, characterized in that: A limiting block is provided at the bottom of the sliding sleeve (12), and a limiting groove is provided on the inner bottom surface of the shock-absorbing sleeve (3). The limiting block extends into the interior of the limiting groove and is slidably connected to the inner wall of the limiting groove.

4. The shock absorbing device for a hydraulic cylinder piston rod according to claim 1, characterized in that: A plurality of second buffer springs (15) are further provided inside the shock-absorbing sleeve (3), and two ends of the second buffer springs (15) are fixedly connected to the inner bottom surface of the shock-absorbing sleeve (3) and the bottom of the sliding pressure column (4), respectively.

5. The shock absorbing device for a hydraulic cylinder piston rod according to claim 4, characterized in that: A second shock-absorbing cylinder (16) is provided inside the second buffer spring (15). The second shock-absorbing cylinder (16) has the same internal structure as the first shock-absorbing cylinder (10). The bottom of the second shock-absorbing cylinder (16) is fixedly connected to the inner bottom surface of the shock-absorbing sleeve (3), and the top of the top pressure rod (19) of the second shock-absorbing cylinder (16) is fixedly connected to the sliding pressure column (4).

6. The shock absorbing device for a hydraulic cylinder piston rod according to claim 1, characterized in that: Limiting protrusions (6) are provided around the bottom end of the sliding pressure column (4), and limiting sliding grooves (7) are provided on the inner walls around the inner periphery of the shock-absorbing sleeve (3). The limiting protrusions (6) extend into the interior of the limiting sliding groove (7) and are slidably connected to the inner wall thereof.

7. The shock absorbing device for a hydraulic cylinder piston rod according to claim 1, characterized in that: A connecting ring (5) is provided on the top of the sliding pressure column (4), and the connecting ring (5) is fixedly mounted on the top of the sliding pressure column (4) by welding.

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