CN219217391U

CN219217391U - Vertical lifting device retraction anti-backlash buffer structure

Info

Publication number: CN219217391U
Application number: CN202223185475.1U
Authority: CN
Inventors: 杜开荣; 陈杰; 彭平; 冯志刚; 向东; 李兵; 郑晶; 向云桥; 杨会
Original assignee: CSIC Zhongnan Equipment Co Ltd
Current assignee: CSIC Zhongnan Equipment Co Ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-06-20
Anticipated expiration: 2032-11-29

Abstract

The utility model discloses a retraction anti-backlash buffer structure of a vertical lifting device, and belongs to the technical field of electromechanical structures. The buffer structure comprises a fixed cylinder, a lifting rod, a guide block and a clearance wheel; groove-shaped guide rails are uniformly distributed in the fixed cylinder along the circumferential direction, and the lower parts of the groove-shaped guide rails are closed; the clearance wheel is movably arranged at the upper end of the groove type guide rail; the outer diameter of the upper end of the lifting rod is larger than that of the rest part, the guide block is fixed on the outer circumferential surface of the lower end of the lifting rod, and the lifting rod is in large-clearance sliding fit with the groove type guide rail in the fixed cylinder only through the guide block at the earlier stage of retraction of the fixed cylinder; the end of the retraction fixed cylinder is retracted, the surface of the clearance wheel is contacted with the outer circle of the large-diameter section at the upper end of the lifting rod, and the small-clearance speed reduction retraction fixed cylinder of the lifting rod is realized. The utility model can ensure that the lifting rod can not shake to generate noise due to overlarge sliding clearance after the lifting device retracts, the lifting device has good buffering and speed reducing effects during working, and meanwhile, the reliable operation of the lifting device in a maintenance period is ensured.

Description

Vertical lifting device retraction anti-backlash buffer structure

Technical Field

The utility model relates to a gap eliminating buffer structure formed by enlarging a local excircle of a gap wheel and a lifting rod, belonging to the technical field of electromechanical structures.

Background

The lifting device has a certain gap in the sliding process, and because of more guide surfaces, difficult processing of the inner guide groove, assembly errors, deformation in the length direction and the like, even if lubrication is good, a certain (about 1 mm) gap is generally ensured, flexible expansion and contraction can be ensured, the resistance is minimum, power is saved, and otherwise, the power consumption is overlarge or the lifting device is blocked.

When the lifting device is not in operation, the lifting rod falls into the fixed cylinder, and if a large gap exists between the lifting rod and the fixed cylinder, the lifting device generates noise on a ship or a car, which is not allowed in the operation of certain products. In addition, in the horizontal placement and transportation process, the lifting rod can deviate to one side.

In order to reduce noise generated by the lifting device, the existing solution is to reduce the clearance between the guide groove and the guide block kinematic pair, which can certainly increase the processing and mounting difficulty of the lifting device, so that the power is increased. The second solution is to increase the guiding length (and thus the height dimension of the product), but this approach will not meet the overall height space requirements.

Disclosure of Invention

In view of the above, the utility model provides a vertical lifting device retraction anti-backlash buffer structure, which can ensure that when the lifting device is retracted, the lifting rod cannot shake due to overlarge sliding clearance to generate noise, the lifting device has good buffering and speed reducing effects when working, and meanwhile, the reliable operation of the lifting device in a maintenance period is ensured.

A vertical lifting device retraction anti-backlash buffer structure comprises a fixed cylinder, a lifting rod, a guide block and a clearance wheel;

groove-shaped guide rails are uniformly distributed in the fixed cylinder along the circumferential direction, and the lower parts of the groove-shaped guide rails are sealed for descending limiting; the gap wheel is movably arranged at the upper end of the groove-shaped guide rail;

the lifting rod consists of a rod body and a buffer ring, the buffer ring is sleeved on the outer circle of the upper end of the rod body to enable the lifting rod to form two sections with different diameters, the guide block is fixed on the outer circumferential surface of the lower end of the rod body, and the lifting rod is in large-clearance sliding fit with the groove type guide rail in the fixed cylinder only through the guide block in the earlier stage of retraction of the fixed cylinder; the end of the retraction fixed cylinder is retracted, the surface of the clearance wheel is contacted with the outer circle of the buffer ring, and the small clearance speed reduction retraction fixed cylinder of the lifting rod is realized.

Further, the clearance wheel is installed on the groove-shaped guide rail through a pin shaft and a bayonet lock.

Further, the buffer ring and the rod body adopt inclined plane transition.

Further, the buffer ring and the gap wheel are made of hard materials and soft materials respectively.

Further, the upper end face of the lifting rod is connected with the carrying object through a screw, and the lower end of the lifting rod is connected with the power device through a screw.

Further, the number of the fixed cylinder inner groove type guide rails is four.

The beneficial effects are that:

1. according to the utility model, the clearance wheel and the clearance eliminating buffer structure for enlarging the local excircle of the lifting rod are arranged on the groove-shaped guide rail, the guide rod operates at a normal clearance in the earlier retraction stage, the clearance between the groove-shaped guide rail and the guide block is larger, the retraction speed of the guide rod is higher, and at the final stage of the retraction process, as the clearance wheel is in contact with the local enlarged excircle of the lifting rod, a small clearance is formed between the guide rod and the fixed cylinder for reducing the speed and rolling in, so that the lifting device has good buffering and reducing effects when working, and the shaking clearance is reduced until the guide rod stops in place, so that the lifting rod cannot shake due to overlarge sliding clearance to generate noise.

2. The clearance wheel is arranged on the groove-type guide rail through the pin shaft and the bayonet lock, the installation process is that the clearance wheel is firstly arranged in the guide groove, the pin shaft is pushed in from the inclined hole on the outer circle of the fixed cylinder, the bayonet lock is arranged after the inner side of the flange of the pin shaft is attached to the outer side of the guide groove, and the half piece is bent by the split joint to prevent falling, so that the clearance wheel is convenient to detach and replace, and the clearance wheel can play a limiting role at the same time.

3. The clearance wheel is convenient to manually repair, grind and adjust or replace, has low replacement cost, is more obvious in use advantage in an underwater severe environment, and is reliable in structure and simple to maintain compared with a complex adjusting mechanism adopting a wedge block for common adjusting clearance or a step that a dovetail groove adjusting mechanism needs fine screw adjustment.

4. The buffer ring and the gap wheel are respectively made of hard materials and soft materials, and the gap wheel is more easily worn after friction occurs between the buffer ring and the gap wheel, so that the gap wheel is only required to be manually polished and adjusted or replaced when the gap is adjusted, and the maintenance and replacement cost is low.

Drawings

FIG. 1 is a schematic view of an anti-backlash buffer structure for use on a vertical lift device;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is an enlarged view of a portion of FIG. 2 at C;

FIG. 5 is a cross-sectional three-dimensional view of the vertical lift device in fully raised and fully retracted states;

FIG. 6 is a partial three-dimensional view of the lift rod entering the cylinder during the anti-backlash process;

fig. 7 is a three-dimensional view of the installation and replacement of the gap wheel.

Wherein, 1-a fixed cylinder; 2-lifting rods; 3-a guide block; 4-gap wheels; 5-a pin shaft; and 6-bayonet lock.

Detailed Description

The utility model will now be described in detail by way of example with reference to the accompanying drawings.

The utility model provides a retraction anti-backlash buffer structure of a vertical lifting device, which is shown in figure 1, and consists of a fixed cylinder 1, a lifting rod 2, a guide block 3, a clearance wheel 4, a pin shaft 5 and a clamping pin 6. The lifting rod 2 adopts a structure with a local outer circle enlarged, namely, a buffer ring which is processed by hard materials such as quenched steel is sleeved on the outer circle at the upper end of the rod body, so that the lifting rod forms two sections with different diameters, and the two sections with different diameters are transited through an inclined plane.

The fixed cylinder 1 contains four groove-shaped guide rails uniformly distributed along the circumferential direction, the lower part of the groove-shaped guide rail is sealed and used for limiting descending, and an upper hole of a flange at the bottom of the groove-shaped guide rail is used for being fixed with a base. As shown in fig. 3, four guide blocks 3 are fixed around the outer circle of the lower part of the lifting rod 2 by screws and uniformly distributed. And then the lifting rod 2 and the guide block 3 are integrally placed in the corresponding groove-shaped guide rail. As shown in figure 2, through holes are processed on two sides of the upper part of the groove-shaped guide rail, four clearance wheels 4 are respectively placed, pin shafts 5 are inserted into the through holes and then are limited by using clamping pins 6, the clearance wheels are mounted on the groove-shaped guide rail in the mode, the clearance wheels 4 can also have a lifting limiting effect on the lifting rod 2 when contacting with the upper end surface of the guide block 3, the mounting relationship of the clearance wheels 4 is as shown in figure 7, and the clearance wheels 4 are processed by adopting soft materials such as brass.

The upper end face of the lifting rod is connected with the carrying object by a screw, and the lower end of the lifting rod is connected with the power device by a screw, so that the whole assembly is completed, and a complete system is formed.

As shown in the right side view of fig. 5, the lifting rod 2 is guided and operated only by the cooperation of the guide block 3 and the groove type guide rail between the lifting rod 2 and the fixed cylinder 1 at the front stage of retracting the fixed cylinder 1. At this time, a larger gap is adopted between the groove-shaped guide rail and the guide block 3, and the gap can be 1mm, so that the running speed is higher. As shown in fig. 6, when the lifter 2 is at the end of the retraction process, after the slope transition section on the lifter 2 passes through the gap wheel 4, the gap wheel 4 starts to contact with the outer circumferential surface of the buffer ring at the upper end of the rod body, and as the movement gap between the lifter and the fixed cylinder 1 is reduced, the lifter 2 rolls down into the fixed cylinder 1 until stopping in place, as shown in the left side view of fig. 5. Because the difference between the radius R of the circular arc twice of the clearance wheel 4 and the diameter D of the buffer ring is smaller than 0.1mm as shown in figure 4, the radial limit of the clearance wheel 4 to the lifting rod 2 can ensure that the lifting rod (containing the carried object) does not shake. The lifting rod rolls in, so that the shaking gap is reduced, and meanwhile, the lifting power is increased little.

The above case is to retract the upper limit clearance, and the structure is also applicable to the lower limit clearance. The structure is suitable for a vertical lifting device and a horizontal telescopic device. In addition, the lifting power device can be an oil cylinder, an air cylinder, a motor screw rod transmission and the like, and drives the lifting rod to move up and down.

In summary, the above embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The retraction anti-backlash buffer structure of the vertical lifting device is characterized in that groove-shaped guide rails are uniformly distributed in the fixed cylinder along the circumferential direction, and the lower parts of the groove-shaped guide rails are sealed for descending limiting; the clearance wheel is movably arranged at the upper end of the groove type guide rail;

the lifting rod consists of a rod body and a buffer ring, the buffer ring is arranged on the outer circle of the upper end of the rod body to enable the lifting rod to form two sections with different diameters, the guide block is fixed on the outer circumferential surface of the lower end of the rod body, and the lifting rod is in large-clearance sliding fit with the groove type guide rail in the fixed cylinder only through the guide block at the earlier stage of retracting the fixed cylinder; the end of the retraction fixed cylinder is retracted, the surface of the clearance wheel is contacted with the outer circle of the buffer ring, and the small clearance speed reduction retraction fixed cylinder of the lifting rod is realized.

2. The vertical lift retraction anti-backlash buffer structure according to claim 1, wherein the clearance wheel is mounted on the grooved rail by a pin and a bayonet.

3. The vertical lift retraction anti-backlash buffer structure according to claim 2, wherein the buffer ring and the rod body are in slant transition.

4. A vertical lift retraction anti-backlash buffer structure according to claim 3, wherein the buffer ring and the clearance wheel are made of hard and soft materials respectively.

5. The structure of claim 4, wherein the upper end of the lifting rod is connected to the carrying object by a screw, and the lower end is connected to the power device by a screw.

6. The vertical lift retraction anti-backlash buffer structure according to claim 5 or 4, wherein the number of the fixed cylinder internal slot type guide rails is four.