An electric adjustable jack

Abstract

The invention provides an electric adjustable jack which comprises a jack head assembly, a lifting assembly, a power transmission assembly and a base assembly. An automatic locking assembly is located in the lifting assembly. Compared with a straight rod shaped lifting assembly of a traditional scissor jack, when the lifting assembly with the bent state lifts an identical object to the same height, torque needing to be output by a motor is smaller, the lifting assembly can be adjusted to the ideal state according to the requirement of the application environment, the requirement of a jack for the torque output by the motor is lowered, and the lifting capacity of the jack can be improved temporarily, so that the jack adapts to the more narrow working environment, and meanwhile the jacking range of the jack is greatly enlarged.

Description

technical field [0001] The invention relates to an adjustable jack, which belongs to the field of lifting devices. Background technique [0002] In the prior art, the lifting device widely used in jacking and adjusting equipment is electric scissor jack. The traditional electric scissor jack is generally composed of a head, a pair of upper arms, a pair of lower arms, a base and a power transmission assembly. The power transmission assembly mainly includes a motor, a motor mounting plate and a lead screw. The support arms are all designed in the shape of straight rods; a pair of upper arms and a pair of lower arms are connected by front and rear pin shafts, the joints of the upper arms are installed with header components, and the joints of the lower arms are installed with bases. The lead screw passes through the front and rear pin shafts, the front pin shaft at the crossing and the lead screw are threadedly connected, and the rear end of the lead screw is connected to the ...

AI Technical Summary

Problems solved by technology

This method has the following problems: since the upper lifting arm and the lower supporting arm of the traditional scissor jack are designed as a fixed straight rod shape, under the premise that the upper lifting arm and the lower supporting arm do not break, the lifting of the scissor jack The capacity depends on the torque that the motor on the jack can provide to the lead screw. In the application process of the scissor jack, when it is necessary to lift a large mass object, the motor is required to provide more torque to increase the jacking force, but due to The torque range that the motor can provide is fixed. At this time, the torque required by the jack often exceeds the maximum torque that the motor can provide. As a result, the motor on the jack cannot meet the lifting needs. For safety reasons, workers often It is necessary to purchase a new jack, which causes economic waste; when the jack is in a narrow working environment and needs to lift heavy objects from a low position, the jack requires the motor to output more torque to increase the load than the general situation. Big lift

Compared with the traditional jack, the performance of this structure has been improved, but there are the following problems: After the upper jib and the lower jib are limited by their respective rotation limit mechanisms, there will be a gap between the upper jib and the upper arm, the lower jib The angle between the support arm and the lifting jib is locked, and the entire lifting assembly is fixed. When the torque required by the jack is still beyond the torque range that the motor can provide, it is impossible to adjust the lifting arm and the lifting jib. The angle between the lower support arm and the lower lifting jib continues to reduce the torque demand of the jack, thereby limiting the further improvement of the jack's lifting capacity; this invention only has a screw nut installed, and the motor mounting plate is in operation. Friction is generated between the lead screw and the motor is required to output more torque to overcome the friction

Images