CZ307440B6 - A lift - Google Patents

Abstract

The invention relates to a lift with a movement mechanism comprising a cab (2) located in the shaft (1). In the centre of the lift shaft (1), there is a non-movable pretensioned screw (3) with a vertical axis which passes through the lift cab (2). The cab (2) is provided with guide rollers (2a). The pretensioned screw (3) is provided with a pretensioning mechanism (3a). Under the floor of the lift cab (2), there is a rotatable roller nut (4), wherein, between its front and supporting part of the cab floor (2), the axial bearing (4a) is located.

Description

The invention relates to the use of a movement mechanism for lifting and lowering persons and loads in a lift technique.

BACKGROUND OF THE INVENTION

For the lifts used up to now, in most cases a system for winding steel ropes onto a drum is used. In rare cases, fluid linear motors are used. This applies especially to lower stroke values. The lifts have different emergency restraint systems in case of failure of the primary lift mechanism. These are often quite complicated and not always fully reliable. The big problem is then in the case of failure to lift the lift cabin to its possible exit.

SUMMARY OF THE INVENTION

The aforementioned drawbacks are overcome by the elevator with the movement thread mechanism of the present invention. Its essence is that it consists of a fixed tube that passes through the center of the elevator shaft. A thread is formed along the outer surface of the pipe. The tube is prestressed by a biasing device. Rotary rollers of the roller nut fit into the external thread. The movement thread mechanism thus formed is located in the center of the elevator car where the screw is covered. The roller nut itself is located under the floor of the elevator car where it rests on the thrust bearing. The roller nut has its drive which rotates it and thus allows it to move axially over the screw body. This allows the cab to be lifted (upward movement). The downward movement of the cab is caused by the spindle nut spontaneous spinning because the thread mechanism is self-locking. The spin limit must be limited as this is the lift lowering speed. By braking the nut, the lift stop position is given. The lift is lowered without power supply, where the position energy of the cabin is used. The energy of the spinning nut during start-up can be used for recovery.

The car is provided with guide rollers which roll on the inner surface of the elevator shaft as the car moves, thereby preventing possible rotation about the longitudinal axis of the car.

The main advantage of this arrangement is the safety of operation of the elevator. The cab is always lifted in a “fixed” connection to the threaded rod by means of a roller nut. The free fall of the cab is out of the question, so no complicated emergency means are required to prevent or resolve this situation.

It is possible to recover the energy generated when lowering the lift cab.

Transported persons have the possibility of so-called self-rescue in case of failure and stopping of the lift cabin between floors. For this purpose, an emergency power supply in the form of electrical elements is used to rotate the roller nut for the necessary time, ie to lower the cabin or to climb higher. When lowering the cab, it is advantageous to use the self-locking movement of the threaded mechanism, it would only be a release of the roller nut, speed control and braking. A given unit can work in an environment of very demanding working conditions and this will significantly increase the utilization of the whole system.

It is possible to use the lift cabin balance, whether positive or negative.

- 1 GB 307440 B6

Clarification of drawings

The elevator with a motion thread mechanism according to the present invention is described in more detail by way of example with reference to the drawings, in which Fig. 1 schematically shows the elevation schematically and Fig. 2 in plan view. FIG. 3 shows an axial bearing located below the floor of the lift car.

DETAILED DESCRIPTION OF THE INVENTION

In the elevator shaft 1 there is a lift cabin 2 which is provided with guide rollers 2a. These prevent the cabin 2 from rotating along its longitudinal axis. A preloaded bolt 3, which is stationary, extends through the center of the elevator shaft 1. The biasing device 3a serves to bias it. The bolt 3 is formed of tubular segments of circular cross-section, which allows the formation of bolts of considerable length. The screw 3 extends longitudinally through the center of the lift cabin 2. Inside this cab 2 is covered by a cover 5 of the screw 3. Under the floor of the cab 2 there is a rotatable roller nut 4, where an axial bearing 4a is inserted between its face and the supporting part of the floor. The nut 4 is rotated by the drive and thereby moves the elevator car 2 in the elevator shaft 1. The mechanism 6 can balance the elevator car 2.

Industrial applicability

A lift with a moving thread mechanism according to the present invention will find application in the case of safe lifts that take advantage of the advantages described above. It is mainly the impossibility of spontaneous fall of the lift cabin, the possibility of energy recovery when lowering the cabin, the possibility of self-release from the lift cabin, which gets stuck outside the outputs, use in very demanding working conditions.

Claims (4)

An elevator with a movement mechanism, comprising a car (2) located in a shaft (1), characterized in that a fixed pre-tensioned bolt (3) with an axis in the vertical direction passing through the car (2) is located in the center of the elevator shaft (1). ) of the elevator, which is provided with guide rollers (2a), wherein the preloaded bolt (3) is provided with a preloading device (3a) and below the elevator floor (2) there is a rotatable roller nut (4) between (2) an thrust bearing (4a) is provided. Lift according to claim 1, characterized in that the screw (3) is made of tubular segments of circular cross-section. Lift according to claim 1 or 2, characterized in that the screw (3) is covered within the cab (2) by a cover (5) of the screw (3). Lift according to any one of the preceding claims, characterized in that it is provided with a mechanism (6) for balancing the lift car (2).