The present invention relates to the lifting and lowering locking device of the double-sized car type lift which is used to lift the car to a certain height from the floor to maintain the parts of the lower body.;In order to service the undercarriage, you have to lift the car horizontally using a lift.;X-shaped folding frame is installed on the pair of floor frames facing each other, supporting plate is installed on the upper part of each X-shaped folding frame, and general double scissor type car with auxiliary X-shaped folding frame and auxiliary supporting plate is installed at the center of each supporting plate. For lifts,;The lower hydraulic cylinder is connected to the inner X-shaped folding frame, and the auxiliary X-shaped folding frame and the supporting plate are connected to the upper hydraulic cylinder so that the supporting plate and the supporting plate can be raised or lowered according to the rod operating state of the lower hydraulic cylinder and the upper hydraulic cylinder. It's supposed to be;Since the vehicle to be maintained is placed on the support plate and the weight is biased to one side, the force on the folding frame is unbalanced or the entire lift is inclined finely depending on the installation location, making it difficult to level accurately and the operator can easily recognize it even if it is placed in the horizontal state. There was no problem.;The present invention is installed so that the fixing piece is formed in contact with the lower hydraulic cylinder bottom surface is formed with a coupling groove having an inclined surface inclined in one direction on the coupling shaft for coupling the lower hydraulic cylinder bottom and the inner X-shaped folding frame,;The auxiliary hydraulic cylinder and the proximity sensor are provided at one side of the outer X-shaped folding frame, and at the same time, one end of the engaging piece having a plurality of locking protrusions formed at the lower side thereof is rotatable.;It is provided with a separate control box in which the indicator lamp and a plurality of operation switches are turned on by the signal of the proximity sensor.;According to the present invention made as described above,;When the rod of the lower hydraulic cylinder rises and pushes up the X-shaped folding frame, the engaging projection of the engaging piece moves on the inclined surface formed in the engaging groove of the fixing piece, and the proximity sensor formed on both engaging pieces is formed between the lower hydraulic cylinder and the engaging piece. When it is judged to be the same distance (horizontal state) by detecting the distance of the control box, the indicator lamp of the control box is turned on. Fully fit into the engaging groove to enter the locked state.;This allows the operator to visually check the level of the support plate by turning on the indicator lamp and operate the locking device to prevent the support plate from falling from the current state, making it possible to maintain the level of the lift firmly and easily. Workers can also work with confidence.
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