Like the shotcrete machine, the transmission mechanism of the construction elevator is an indispensable industrial equipment in the construction of the construction project. Its working characteristics are not only related to the process of the project, but also related to the life safety of the staff. In order to ensure that the process of work can be carried out on time under the premise of ensuring the life safety of workers, it is required that we must pay attention to the following contents when using the construction elevator:

　　① The rope break protector should be intact, flexible and reliable.

　　② There is no need to descend when the cage is detained, restart and ascend in mid air, and there is no need to descend instantaneously.

　　③ The cage door elevator should be easy to operate, and its interlocking characteristics should be excellent. The cage can be started only after the cage door is completely closed.

　　④ Lifting cage and counterweight buffer device shall be installed on the base of double lift and cargo lift with rated load capacity above 405kg.

　　⑤ Each cage of SC. type elevator shall be equipped with progressive safety device, and its braking distance shall be 0.25-1.1m. Instantaneous safety device is not allowed.

　　Hydraulic lift drift of construction lift transmission mechanism and its solution

　　In the whole process of application, the elevator drifted upward when it was in the lower part, which improved the unsafe factors of machinery and equipment. This paper analyzes the hydraulic transmission system and components of the elevator, finds out the causes of drift, and puts forward some suggestions To improve the way of hydraulic transmission system, to deal with the problem of lift drift

　　2 lift drift root cause

　　2.1 the basic principle of the hydraulic transmission system of the upward drift elevator is shown in Figure 1. When the manual hydraulic directional valve in the computer operating system connects port a and port P, the elevator rises up slowly; On the contrary, when port a communicates with port T, the lift is lowered. The function of the one-way throttle valve in the system software is to adjust the lift speed of the lift When the elevator is at the limit position of descent, the manual hydraulic directional valve will repair the middle position. At this time, port a and port P and port T are not interconnected, and the elevator should be maintained at the descending position. However, in order to reduce the internal leakage of the manual hydraulic directional valve, in addition to isolating the middle of each port according to the fine gap between the valve core and the valve sleeve, the oil inlet and delivery pump is also raised, so that its safety is improved The amount of leakage is 3ml / min