Mechanical airplane jack

Abstract

The invention discloses a mechanical airplane jack. The mechanical airplane jack comprises a supporting frame, a rapid lifting mechanism, a rapid driving mechanism for driving the rapid lifting mechanism to move or position in a no-load stroke, a bearing sleeve and a heavy load driving mechanism for driving the bearing sleeve to move or position in a load stroke, wherein the rapid driving mechanism is mounted on the bearing sleeve; the lower end of the rapid lifting mechanism enters into the bearing sleeve and is in transmission match with the rapid driving mechanism; the heavy load driving mechanism is mounted on the supporting frame and is in transmission match with the bearing sleeve. According to the mechanical airplane jack, the rapid driving mechanism of the rapid lifting mechanism is separated from the heavy load driving mechanism of the bearing sleeve, so that the rapid lifting mechanism can rapidly achieve the target position, and the lifting time of the mechanical airplane jack can be sharply shortened.

Description

technical field [0001] The invention belongs to the technical field of jacks, and in particular relates to a mechanical aircraft jack. Background technique [0002] During the jacking process of large-scale equipment such as airplanes, its stress characteristics are: long jacking stroke. Common jacks require a height difference of 1500mm to 3500mm from the height of the jack in the standby state to the jacking terminal, of which 1200mm to 3200mm is the no-load stroke, the payload stroke is only about 300mm, and the weight of the load reaches 10 tons to 30 tons, and has The large lateral force is about 10% of the vertical load, which determines that the volume of this type of equipment is generally large and its own weight is also large. At present, the power source for lifting the jack is mostly manual or electro-hydraulic. The method has the advantages of convenient operation, easy adjustment of the force direction of the manual operation lever, and stable operation. But ...

AI Technical Summary

Problems solved by technology

But there are also many disadvantages: easy oil leakage, poor self-locking performance, complex structure, fast-forward and working-forward lifting speeds are the same, resulting in very slow rising speeds, and one operation often takes 20 minutes to 50 minutes. The general movement mode of large jacks The traveling mode is three supporting wheels, there is no two-dimensional movement, and it is not easy to align the head with the best stress point, etc.

[0003] Common hydraulic jacks mostly adopt the structural form of combined nested multi-stage cylinders for large-scale lifting. The oil inside the multi-machine combined hydraulic cylinders bears the same pressure. Another unavoidable problem in the structure is the no-load stroke The diameter of the lifting hydraulic cylinder is relatively large, so it needs a large amount of oil supply. If the manual hydraulic cylinder is used to lift 3000mm, it usually takes about 40 minutes, which brings inconvenience to the maintenance of the aircraft in the field, and the hydraulic system is unavoidable. There will be oil spills, which is bad for aircraft jacking that takes a long time (hours to tens of days between maintenance intervals)

[0004] Commonly used heavy-duty jacks are mostly moved by three wheels, and the front wheels can change the direction of travel. Since the space at the bottom of the aircraft is not conducive to moving back and forth to adjust the center position of the jack, it is not very convenient to align the jack with the center of gravity of the aircraft.

Since the highest point of the aircraft jack is from 3000mm to 5500mm, it often needs to be aligned repeatedly on site, which brings inconvenience to actual use and also affects equipment safety.

[0005] The hydraulic jack loads the piston rod and cannot bear the lateral force. Its mechanical locking mechanism has two major disadvantages. One is that it needs to be manually adjusted at any time during the fast-forward process, so its operation generally requires two people to operate. The next level of connection can only transmit lateral force through friction, which has potential safety hazards

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