Piston rod reset mechanism of jack and jack

Abstract

The invention provides a piston rod reset mechanism of a jack and the jack. The piston rod reset mechanism is used for resetting a piston rod of the jack and comprises an air source supply device, an unloading control mechanism and a controllable one-way valve, the piston rod is provided with a piston head, the jack comprises a hydraulic cylinder, the piston head is located in the hydraulic cylinder and divides the hydraulic cylinder into a cavity with the piston rod and a cavity without the piston rod, and an oil outlet oil passage is arranged in the cavity without the piston rod; the unloading control mechanism is connected to the air source supply device; the controllable one-way valve is arranged on the oil outlet oil passage and connected with the unloading control mechanism; the cavity with the piston rod is connected with the air source supply device or the unloading control mechanism. When the piston rod reset mechanism of the jack and the jack are used, the piston rod is pushed to conduct resetting through an air pressure mode, the resetting speed of the piston rod is fast, and the stability of the resetting is good; meanwhile, a return air passage is arranged inside an oil tank and combined with the oil tank to be a whole, so that the overall size of the hydraulic jack is small, the appearance is attractive, the operation is convenient, and the usage requirements of the hydraulic jack are met for people.

Description

technical field [0001] The invention relates to the technical field of hydraulic jacks, in particular to a jack-applied piston rod reset mechanism and the jack. Background technique [0002] The jack is a kind of lifting equipment, which is often used to lift heavier loads. According to the force transmission process of lifting the piston rod, the jack can be divided into a mechanical jack and a hydraulic jack. Among them, the hydraulic jack is widely used because of its simple structure, light weight, portability and convenient movement. [0003] When the hydraulic jack is in use, its lifting effect on the piston rod is realized by oil pressure. At present, when the raised piston rod is reset, a spring is generally used to reset it. Specifically, the spring return structure adopts a built-in or an external spring, and the piston rod is reset by spring tension. It can be understood that the above-mentioned spring return structure is applied in the pneumatic vertical roof,...

AI Technical Summary

Problems solved by technology

It can be understood that the above-mentioned spring return structure is applied in the pneumatic vertical roof, and its spring needs to occupy the space of the jack, which is not conducive to the miniaturization of the overall structure of the pneumatic vertical roof equipment. So that when the jack is in use, the reset speed of the piston rod is in a linear state. When the piston rod reaches the lower end, the spring force becomes smaller. After long-term use, the spring becomes weaker due to fatigue, so that the piston rod cannot be reset to the lowest point.

[0004] Moreover, the reset structure of the traditional jack has slow reset speed, poor stability, and a large volume, which is not conducive to satisfying people's use needs for the jack.

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