Method for modernizing a hydraulic elevator

摘要

A method for modernizing a hydraulic elevator including an elevator car guided by car guide rails for moving in an essentially vertical direction in the elevator hoistway, a hydraulic system including a lifting cylinder having a cylinder part essentially vertically supported on the base of the elevator hoistway and a piston rod moving in relation to the cylinder part and a hydraulic powerpack and a control center. The hydraulic system of the hydraulic elevator is modernized to include a function for preventing unintended starting at a floor, in such a way that the hydraulic powerpack is retained and an electrically-operating valve that is monitored with a control and that acts on the flow of hydraulic fluid of the lifting cylinder is added to the hydraulic system. The control controls a valve to prevent movement of the piston rod of the lifting cylinder downwards and/or upwards, if predetermined criteria are fulfilled.

主权项

1. A method for modernizing a hydraulic elevator, which hydraulic elevator comprises
an elevator car, which elevator car is guided by car guide rails for moving in an elevator hoistway; and a hydraulic system, which comprises:
a lifting cylinder, which is arranged in a space between a wall of the elevator hoistway and the elevator car, which lifting cylinder comprises a cylinder part supported on a base of the elevator hoistway, and a piston rod movable in relation to the cylinder part, which piston rod is arranged to move the elevator car along the car guide rails, anda hydraulic powerpack, which produces an hydraulic pressure needed for the lifting cylinder,a control center, which comprises control means for controlling the movement of the elevator car, and in which method the hydraulic system of the hydraulic elevator is modernized to comprise a function for preventing unintended starting at a floor, wherein an electrically-operating valve that is monitored with a control and that acts on a flow of hydraulic fluid of the lifting cylinder is added to the hydraulic system, and the control controls the valve to prevent movement of the piston rod of the lifting cylinder downwards and/or upwards, if predetermined criteria are fulfilled, wherein the hydraulic powerpack comprises:
a valve stack; anda main shut-off valve, and wherein the valve is located between the valve stack of the hydraulic powerpack and the main shut-off valve.