Piston rod damping device for hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinders, and discloses a piston rod damping device for a hydraulic oil cylinder, which comprises a piston rod, a fixing block is arranged at the tail end of the piston rod, a damping box is arranged on one side, far away from the piston rod, of the fixing block, and an air cavity is hermetically arranged in the damping box and is divided into a first cavity and a second cavity along the length direction of the piston rod; the first cavity is located on the side, away from the piston rod, in the damping box, a damping mechanism for conducting damping protection on the piston rod is arranged in the first cavity, and the damping mechanism comprises a push rod slidably arranged on the inner top wall of the damping box in a penetrating mode and a floating piston arranged at the end of the push rod. The push rod is parallel to the length direction of the piston rod and matched with the first cavity, a connecting ring used for being connected with external equipment is arranged on the side, extending out of the damping box, of the push rod, and a plurality of through holes used for generating the damping effect are distributed in the floating piston in the circumferential direction. The effect of prolonging the service life of the hydraulic oil cylinder is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic cylinders, and in particular to a piston rod damping device for a hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion or swinging motion. It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] In the prior art, the hydraulic cylinder is generally connected to an external device through a piston rod. The vibration generated by the external device will be directly transmitted to the piston rod, and the piston rod will also vibrate. If the hydraulic cylinder is used for a long time, the piston rod will vibrate violently for a long time, which will easily lead to reduced sealing at the connection between the piston rod and the hydraulic cylinder body, and even deformation of the piston rod, thereby reducing the service life of the hydraulic cylinder. Utility Model Content

[0004] In order to increase the service life of a hydraulic cylinder, the present application provides a piston rod shock absorbing device for a hydraulic cylinder.

[0005] The present application provides a hydraulic cylinder piston rod damping device that adopts the following technical solution:

[0006] A piston rod shock-absorbing device for a hydraulic cylinder comprises a piston rod, a fixed block is provided at the end of the piston rod, a shock-absorbing box is provided on the side of the fixed block away from the piston rod, an air cavity is sealed in the shock-absorbing box, and the air cavity is divided into a first cavity and a second cavity along the length direction of the piston rod, the first cavity is located on the side of the shock-absorbing box away from the piston rod, and a damping mechanism for shock-absorbing and protecting the piston rod is provided in the first cavity, the damping mechanism comprises a push rod slidably penetrated on the top wall of the shock-absorbing box and a floating piston provided at the end of the push rod, the push rod is parallel to the length direction of the piston rod and matches the first cavity, and a connecting ring for connecting to an external device is provided on the side of the push rod extending out of the shock-absorbing box, and a plurality of through holes for generating a damping effect are distributed circumferentially on the floating piston.

[0007] By adopting the above technical solution, when the vibration generated by the external device is transmitted to the connecting ring, the connecting ring drives the push rod to slide in the first cavity, and the sliding of the push rod further drives the floating piston to move. Since the floating piston is provided with through holes, these through holes will produce a damping effect during the movement of the floating piston, that is, the gas is hindered when passing through these through holes, thereby converting the vibration energy into heat energy and dissipating it, thereby realizing shock-absorbing protection for the piston rod. This structure effectively reduces the vibration transmitted to the piston rod and increases the service life of the hydraulic cylinder.

[0008] Optionally, the center line of the second cavity coincides with that of the first cavity, and the size of the second cavity is larger than that of the first cavity, and an adjustment component for adjusting the volume of the air cavity is arranged in the second cavity, and the adjustment component includes an adjustment cover arranged in the second cavity along a sliding direction toward the first cavity, a screw arranged on the side of the adjustment cover away from the first cavity, and a drive ring arranged on the screw through a threaded sleeve, and the drive ring is rotatably arranged on the shock absorbing box.

[0009] By adopting the above technical solution, rotating the drive ring can make the screw move axially, thereby driving the adjustment cover to slide in the second cavity and changing the volume of the air cavity. The change in the volume of the air cavity will affect the vibration absorption capacity of the damping mechanism. When it is necessary to increase the shock absorption effect, the volume of the air cavity can be reduced to make the damping mechanism more compact and improve the damping effect; conversely, when it is necessary to reduce the shock absorption effect, the volume of the air cavity can be increased. By adjusting the volume of the air cavity, the vibration absorption capacity of the damping mechanism can be changed, thereby adapting to the demand for shock absorption effect in different working environments, and improving the applicability and flexibility of the shock absorption device.

[0010] Optionally, a gear ring is provided on the outer wall of the driving ring, a gear is rotatably provided on the outer wall of the shock absorbing box, a connecting port is provided on the shock absorbing box corresponding to the gear connected to the second cavity, and part of the gear passes through the connecting port and is meshed with the gear ring.

[0011] By adopting the above technical solution, the rotating gear is driven to rotate, thereby driving the meshing driving ring to rotate, so as to facilitate the adjustment of the volume of the air cavity.

[0012] Optionally, a compression spring is abutted between the adjusting cover and the inner top wall of the second cavity.

[0013] By adopting the above technical solution, the compression spring can apply a downward pre-tightening force to the regulating cover, ensuring that the regulating cover can be maintained in a stable position when not affected by external forces.

[0014] Optionally, a visual window is provided on the outer side wall of the shock absorbing box located in the second cavity, and the adjusting cover is arranged to fit the inner wall of the visual window.

[0015] By adopting the above technical solution, the specific position of the adjustment cover in the second cavity can be observed through the visual window, which is convenient for the operator to adjust the volume of the air cavity.

[0016] Optionally, a scale is provided on the side wall of the outer wall of the shock absorbing box that is in contact with the visual window, corresponding to the sliding distance of the adjustment cover.

[0017] By adopting the above technical solution, the position of the adjustment cover can be visually observed using a scale, so as to more accurately control the volume of the air cavity.

[0018] Optionally, a handwheel is coaxially fixedly disposed at the rotating shaft of the gear to facilitate manual driving of the gear to rotate.

[0019] By adopting the above technical solution, the setting of the hand wheel makes it easier for the operator to turn the gear.

[0020] Optionally, the shock absorbing box and the fixed block are detachably arranged, a dovetail-type slide bar is arranged on the bottom wall of the shock absorbing box, a limiting slide groove is arranged on the top wall of the fixed block corresponding to the slide bar, the slide bar and the limiting slide groove are slidably matched with each other, and a through groove is provided on the fixed block perpendicular to the direction of the limiting slide groove to connect the slide bar, a positioning pin is inserted in the through groove, and the positioning pin is jointly inserted into the fixed block and the shock absorbing box.

[0021] By adopting the above technical solution, the dovetail-shaped slide bar on the bottom wall of the shock-absorbing box is correspondingly inserted into the limiting slide groove, and then the positioning pin is simultaneously inserted into the fixed block and the shock-absorbing box to achieve a detachable connection between the two, which facilitates the installation, disassembly and maintenance of the shock-absorbing device and improves the convenience of use.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. When the vibration generated by the external device is transmitted to the connecting ring, the connecting ring drives the push rod to slide in the first cavity, and the sliding of the push rod further drives the floating piston to move. Since the floating piston is provided with through holes, these through holes will produce a damping effect during the movement of the floating piston, that is, the gas is hindered when passing through these through holes, thereby converting the vibration energy into heat energy and dissipating it, realizing shock-absorbing protection for the piston rod. This structure effectively reduces the vibration transmitted to the piston rod and increases the service life of the hydraulic cylinder;

[0024] 2. Rotating the drive ring can make the screw move axially, thereby driving the adjustment cover to slide in the second cavity and changing the volume of the air cavity. Changes in the volume of the air cavity will affect the damping mechanism's ability to absorb vibrations. When it is necessary to increase the shock absorption effect, the volume of the air cavity can be reduced to make the damping mechanism more compact and improve the damping effect; conversely, when it is necessary to reduce the shock absorption effect, the volume of the air cavity can be increased. By adjusting the volume of the air cavity, the damping mechanism's ability to absorb vibrations can be changed, thereby adapting to the demand for shock absorption effects in different working environments and improving the applicability and flexibility of the shock absorption device;

[0025] 3. Drive the rotating gear to rotate, thereby driving the meshing drive ring to rotate, so as to adjust the volume of the air cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view of the overall structure of an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Piston rod; 2. Fixed block; 21. Limiting slide groove; 22. Through groove; 221. Locating pin; 2211. Tightening nut; 3. Shock absorber box; 31. Slide bar; 32. Ring groove; 33. Connecting port; 34. Visual window; 35. Scale; 4. Air cavity; 41. First cavity; 42. Second cavity; 5. Damping mechanism; 51. Push rod; 52. Floating piston; 521. Through hole; 6. Adjustment assembly; 61. Adjustment cover; 62. Screw; 63. Drive ring; 631. Gear ring; 7. Connecting ring; 8. Fixed box; 81. Gear; 811. Handwheel; 9. Compression spring. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 This application is described in further detail.

[0031] The embodiment of the present application discloses a piston rod shock absorbing device for a hydraulic cylinder.

[0032] Reference Figure 1 and Figure 2 A piston rod shock absorbing device for a hydraulic cylinder includes a piston rod 1, a fixed block 2 is fixedly provided at the end of the piston rod 1, a shock absorbing box 3 is detachably provided on the side of the fixed block 2 away from the piston rod 1, and an air cavity 4 is sealed in the shock absorbing box 3. The air cavity 4 is divided into a first cavity 41 and a second cavity 42 along the length direction of the piston rod 1. The first cavity 41 is located on the side of the shock absorbing box 3 away from the piston rod 1, and a damping mechanism 5 for shock absorbing and protecting the piston rod 1 is provided in the first cavity 41, and an adjusting component 6 for adjusting the volume of the air cavity 4 is provided in the second cavity 42.

[0033] Reference Figure 1 and Figure 2 , install the shock absorbing device on the piston rod 1 of the hydraulic cylinder, ensure that the fixing block 2 is fixedly connected to the piston rod 1, and the shock absorbing box 3 is connected to the external device through the connecting ring 7; according to the working environment and shock absorption requirements, adjust the volume of the air cavity 4 through the adjusting component 6; when the external device vibrates, the damping effect generated by the damping mechanism 5 is used to absorb and buffer the vibration, thereby reducing the influence of the vibration generated by the external device on the piston rod 1 of the hydraulic cylinder.

[0034] Reference Figure 1 and Figure 2A dovetail-shaped slide bar 31 is fixedly arranged on the bottom wall of the shock-absorbing box 3, and a limiting slide groove 21 is provided on the top wall of the fixed block 2 corresponding to the slide bar 31. The slide bar 31 and the limiting slide groove 21 are slidably matched. A through groove 22 is provided on the fixed block 2 in a direction perpendicular to the limiting slide groove 21 and connected to the slide bar 31. A positioning pin 221 is inserted in the through groove 22. The positioning pin 221 is jointly inserted into the fixed block 2 and the shock-absorbing box 3, and both ends of the positioning pin 221 extending out of the fixed block 2 are provided with a tightening nut 2211 through a threaded sleeve.

[0035] Reference Figure 2 The damping mechanism 5 includes a push rod 51 and a floating piston 52. The push rod 51 is parallel to the length direction of the piston rod 1 and is matched with the length of the first cavity 41. It is slidably penetrated on the inner top wall of the shock absorber box 3. The end of the push rod 51 extending out of the shock absorber box 3 is fixedly connected to the connecting ring 7. The floating piston 52 is fixedly set at the bottom end of the push rod 51 and is sealed and slidably matched with the inner wall of the first cavity 41. There are a number of through holes 521 distributed along the circumference of the floating piston 52 for generating a damping effect. These through holes 521 can form damping in the air cavity 4, effectively absorbing and buffering the vibration transmitted to the piston rod 1.

[0036] Reference Figure 2 , the center line of the second cavity 42 coincides with that of the first cavity 41, and the size of the second cavity 42 is larger than that of the first cavity 41. The adjustment assembly 6 includes an adjustment cover 61, a screw 62, and a drive ring 63. The adjustment cover 61 is sealed and slidably matched with the inner wall of the second cavity 42, and is slidably arranged in the second cavity 42 toward the first cavity 41. The screw 62 coincides with the center line of the second cavity 42, and is fixedly arranged on the side wall of the adjustment cover 61 away from the first cavity 41. The inner wall of the shock absorbing box 3 is provided with an annular groove 32, and the drive ring 63 is coaxially matched and rotatably arranged in the annular groove 32, and the drive ring 63 is arranged on the screw 62 by a threaded sleeve.

[0037] Reference Figure 1 and Figure 2 A gear ring 631 is fixedly provided on the outer wall of the driving ring 63, a fixing box 8 is fixedly provided on the outer wall of the shock absorbing box 3, a connecting port 33 is opened on the side wall of the shock absorbing box 3 to connect the fixing box 8 and the annular groove 32, a gear 81 meshing with the gear ring 631 is rotatably provided inside the shock absorbing box 3, the rotating shaft of the gear 81 rotates and penetrates the top wall of the fixing box 8, and a hand wheel 811 that is convenient for hand holding is coaxially fixedly provided on the rotating shaft part of the gear 81 extending out of the fixing box 8.

[0038] Reference Figure 2 A compression spring 9 is also in contact between the regulating cover 61 and the inner top wall of the second cavity 42. The compression spring 9 can apply a downward pre-tightening force to the regulating cover 61 to ensure that the regulating cover 61 can remain in a stable position when not affected by external forces.

[0039] Reference Figure 1 and Figure 2 The shock absorbing box 3 is fixedly provided with a visual window 34 on the outer side wall of the second cavity 42. A scale 35 is electroplated on the side wall of the outer wall of the shock absorbing box 3 that fits the visual window 34, corresponding to the sliding distance of the adjustment cover 61, and the adjustment cover 61 fits the inner wall of the visual window 34. The position of the adjustment cover 61 can be visually observed through the visual window 34 and the scale 35, so as to more accurately control the volume of the air cavity 4.

[0040] The implementation principle of the piston rod shock absorbing device for a hydraulic cylinder in the embodiment of the present application is as follows: install the shock absorbing device on the piston rod 1 of the hydraulic cylinder, ensure that the fixing block 2 is fixedly connected to the piston rod 1, and the shock absorbing box 3 is connected to the external device through the connecting ring 7; according to the working environment and shock absorption requirements, adjust the volume of the air cavity 4 by rotating the driving ring 63, and during the adjustment process, observe the scale 35 on the visual window 34 to ensure that the adjustment cover 61 moves to the appropriate position; when the external device vibrates, observe the working condition of the shock absorbing device. The damping effect generated by the through hole 521 on the floating piston 52 absorbs and buffers the vibration, thereby protecting the piston rod 1 from damage; regularly check the working status of the shock absorbing device, including checking whether the connecting ring 7 is loose, whether the shock absorbing box 3 is damaged, and whether the air pressure in the air cavity 4 is normal, etc. If any problems are found, repair or replace the parts in time.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A piston rod damping device for a hydraulic cylinder, characterized in that: The invention comprises a piston rod (1), a fixing block (2) is arranged at the end of the piston rod (1), a shock absorbing box (3) is arranged on the side of the fixing block (2) away from the piston rod (1), an air cavity (4) is sealedly arranged in the shock absorbing box (3), and the air cavity (4) is divided into a first cavity (41) and a second cavity (42) along the length direction of the piston rod (1), the first cavity (41) is located on the side of the shock absorbing box (3) away from the piston rod (1), and a shock absorbing protection for the piston rod (1) is arranged in the first cavity (41). A damping mechanism (5), the damping mechanism (5) comprising a push rod (51) slidably penetrated on the inner top wall of the shock absorbing box (3) and a floating piston (52) arranged at the end of the push rod (51), the push rod (51) is parallel to the length direction of the piston rod (1) and is matched with the first cavity (41), and a connecting ring (7) for connecting to an external device is arranged on the side of the push rod (51) extending out of the shock absorbing box (3), and a plurality of through holes (521) for generating a damping effect are distributed along the circumference of the floating piston (52).

2. A piston rod damping device for a hydraulic cylinder according to claim 1, characterized in that: The center lines of the second cavity (42) and the first cavity (41) coincide with each other, and the size of the second cavity (42) is larger than that of the first cavity (41). An adjusting component (6) for adjusting the volume of the air cavity (4) is arranged in the second cavity (42). The adjusting component (6) comprises an adjusting cover (61) arranged in the second cavity (42) so as to slide toward the first cavity (41), a screw (62) arranged on the side of the adjusting cover (61) away from the first cavity (41), and a driving ring (63) threadedly sleeved on the screw (62), and the driving ring (63) is rotatably arranged on the shock absorbing box (3).

3. A piston rod damping device for a hydraulic cylinder according to claim 2, characterized in that: A gear ring (631) is arranged on the outer wall of the driving ring (63), a gear (81) is rotatably arranged on the outer wall of the shock absorbing box (3), a connecting port (33) corresponding to the gear (81) connected to the second cavity (42) is opened on the shock absorbing box (3), and a portion of the gear (81) passes through the connecting port (33) and is meshed with the gear ring (631).

4. A piston rod damping device for a hydraulic cylinder according to claim 2, characterized in that: A compression spring (9) is abutted between the regulating cover (61) and the inner top wall of the second cavity (42).

5. The piston rod damping device for a hydraulic cylinder according to claim 2, characterized in that: The shock absorbing box (3) is provided with a visible window (34) on the outer side wall of the second cavity (42), and the adjustable cover (61) is arranged in contact with the inner wall of the visible window (34).

6. A piston rod damping device for a hydraulic cylinder according to claim 5, characterized in that: A scale (35) is provided on the side wall of the outer wall of the shock absorbing box (3) which is in contact with the visual window (34) and corresponds to the sliding distance of the regulating cover (61).

7. A piston rod damping device for a hydraulic cylinder according to claim 3, characterized in that: A hand wheel (811) is coaxially fixedly disposed at the rotating shaft of the gear (81) for facilitating manual driving of the gear (81) to rotate.

8. The piston rod damping device for a hydraulic cylinder according to claim 1, characterized in that: The shock absorbing box (3) and the fixed block (2) are detachably arranged, a dovetail-shaped slide bar (31) is arranged on the bottom wall of the shock absorbing box (3), a limiting slide groove (21) is arranged on the top wall of the fixed block (2) corresponding to the slide bar (31), the slide bar (31) and the limiting slide groove (21) are slidably matched, and a through groove (22) is provided on the fixed block (2) and connected to the slide bar (31) in a direction perpendicular to the limiting slide groove (21), a positioning pin (221) is inserted in the through groove (22), and the positioning pin (221) is jointly inserted into the fixed block (2) and the shock absorbing box (3).

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