DE575096C - Fine adjustment for electric elevators - Google Patents

Description

Fine tuning for electric elevators The invention relates to on a special design and circuit arrangement for electric elevators and aims a simplification of the previously usual arrangements.

It is known that with regard to the various burden of the Ferry cages in practice it is difficult to achieve that the car is always accurate comes to a standstill at the desired height in relation to the floor in question. While the braking distance will be small when the car is under low load, is this braking distance at full load is significantly greater, which means that in the .ersten If the car comes to a standstill before the desired point, otherwise behind this point, whereby naturally also the direction of movement (upward or Downward movement) plays an important role. The exact stopping of the elevator at the correct height is especially important for goods lifts where the Goods are transported on small wagons on rails with the call train.

In order to ensure that, despite these circumstances, the car is exactly in the same level with the floor in question has come to a standstill often an auxiliary engine is used after the main engine has stopped the drum of the winch an additional rotation in the desired direction granted. Such an auxiliary device increases the procurement costs of the elevator system, makes the system unnecessarily tangled.

There are now also fine adjustment devices for .electric Elevators known, in which, if the car is not in the exact corridor height of the stopping floor has come to rest by means of run-up curves and corresponding Contacts an auxiliary circuit is closed, whereby the elevator motor again is applied to the same power source as for normal operation until the auxiliary circuit through the run-up curves and the contacts when reaching the exact height of the Stoclwerk is interrupted and the car stops at the correct height.

The subject matter of the invention differs from these known devices in that a timing relay is provided that controls the otherwise open auxiliary circuit closes a certain time after switching off the normal control circuit, and that a second time relay is also provided, which the effect of the normal Control prevented and that works with a greater delay than the former Relay.

The known arrangements are compared with the application of the invention the advantage achieved that it is a relatively simple one and therefore cheap equipment of the elevator system with a reliable effect and a little intricate circuit-enables; here is the use of special rugs, which are turned on during the fine-tuning period are unnecessary.

In the drawing is a circuit diagram of an embodiment of the elevator shown according to the invention, for example.

Fig. I shows the circuit arrangement of the overall system of an elevator using the invention.

Fig. A shows a circuit diagram of the essential circuits with the Relays R1, R2, R3 and S1, the changeover magnets M, L and Mo, the push buttons DKi, D [K2 etc. and the floor switches d1 to d4.

The arrangement is drawn for four floors, II, III and IV (Fig. I). The usual signal lamps that indicate the position of the Elevator a or indicate the direction of movement of the elevator, as well as a Push button DK, arranged to DK4 to control the elevator. Located in the shaft for each floor there is a contact bar b, which consists of three superimposed, mutually insulated contact strips b1, b2, b3, with which one on the elevator a fixed sliding contact c cooperates. When this sliding contact c with the middle Contact strip b2 is in contact, the elevator is in the desired Position in front of a floor. The length of the contact strip b2 is therefore the permissible one The difference in stops between the elevator and the floor of the floor is the same. Remains that Lift a stand at the end of the braking distance before reaching the desired stopping position is, the sliding contact c is in contact with the contact strip bi or b3, so that an auxiliary circuit is closed via the same, whereby it is achieved that the elevator is in the right position, even with the doors and bars open to be led.

Some relays have also been used in the circuit, and a relay R1, which prevents the rail contacts b from being switched on, when the elevator passes a floor where there is no stopping. This relay R1 opens the auxiliary circuit as long as it is through the normal control circuit a stream flows. It must therefore operate with a delay that is normal The run-down path of the elevator corresponds to that if the elevator does not stop when the elevator is stopped is in the correct position, the auxiliary circuit is closed and the elevator then by switching on the motor again as precisely as possible in the respective floor height can be brought. A relay R2 is used to prevent the motor from being switched on by means of the normal control, if .a door on the floors or the door the elevator is open. This relay is connected in a circuit, which is guided via the various door contacts and in the position of the elevator, in which the auxiliary circuit is closed, is short-circuited. Finally is Another relay R3 is used, which ensures that when a push button is pressed the motor does not turn on before the elevator is in the correct position has arrived.

The upward and downward movement of the car is controlled in a generally known manner by two changeover magnets Mo and Mn. The mentioned relays R1, R2 and R3 are timing relays; and the magnets Mo and Mn operate with a delay, namely in such a way that the relay R1 operates with a smaller delay than the relay R2 and R2 again with a smaller delay than the magnets-M "and IM, in the practical construction of an elevator according to the invention it is of considerable importance that the relays R, and R2 as well as the switching magnets Mo and M, L work together in a certain way. Push button, normally closed contacts, etc., winding of magnet Ma to branch point i qua closed via the winding of relay R2. The fact that relay R1 is energized prevents rail contact b from being switched on when the car is on a floor where should not be held, while relay R2 - as already stated - has the task of preventing the motor from being switched on by means of the normal control et can be when a door of the floor o. The like. Is open. Assuming now that relay R1 would work with a greater delay than relay R2, then the car would not be able to be set in motion at all, because then the circuit that lies between phase S and phase R and via the relay winding R1 and the Relay contacts R2 and R3 do not close at all. If the relay R2 had already responded before the relay R, then this circuit would be interrupted again immediately; besides- would be. this gives the possibility that the auxiliary circuit via c remains closed via the relay R, which should always be open for the journey. In addition, however, the relay R must also operate with a shorter delay than the relay R2 and this in turn with a shorter delay than the switching magnets Mo ,, Mn , since otherwise the desired effects, namely the switching on of the motor etc., do not take place at the correct time would. A voltage drop can occur between the end points of the door contacts. In order to prevent the relay R2 from switching on at an undesired moment, a resistor W is connected in series with it.

With d a disk-shaped floor switch is indicated, the at. Movement of the elevator a over the entire lifting height executes one revolution and with switches d to d4, the positions of which correspond to the position of the elevator correspond in the shaft. According to the drawing (Fig. I) is the car on the third floor. Accordingly, the changeover switch d4 is connected to the lower contact, the changeover switch earth, d2 is connected to the upper contact, while the switching d3 is in the middle Position.

The effect of the arrangement is as follows: Assume that the car should be moved from the third floor III, where it is located, to the first floor, what by pressing the push button DKe or in the car by pushing the push button DKl ' occurs, the following circuit is closed (see also FIG. 2) phase S of the network, main switch lt, fuse v2, contacts of relay R2, winding of relay Re, contacts of relay R3, line 5 through the flexible cable, push button DKl, normally closed contacts of the push buttons DK ?, Dh'3; DK4, line 4, flexible cable, push button DK "which has been pressed, for example, winding of relay S1, changeover switch dl, lower contact above the switching magnet'M'o, winding of the magnet M, 1 to Junction point 14, winding of relay R2, resistor W, line 3, short-circuit contact h, line 2, fuse v1, main switch h, phase R.

A second path for the current is formed from branch point 14 via door contacts ei, e2, e3, e4, line io, stop button HK, door contact ei; the so-called slack rope contact SC, line 13, fuse v1, main switch h, phase, R. .

A current only flows over the second path if all door contacts, so all doors are closed. The same current curve occurs when on Place the push button DK, the button DKl is pressed in the elevator. The ones in the The so-called circuit switched relays attract their armature. The relay S1 closes its contacts, whereby it is achieved that the push button DK, or DK, 'are released can without stopping the engine. The relay R1 opens its contacts immediately after switching on the D @ KI or DK, 1 button, i.e. before the magnet M, t switches on, whereby the circuit to the sliding contact c is interrupted will. By energizing the switching magnet Mn, the one below this magnet lying switches p, t closed, so the motor is switched on and at the same time by. open # the lower contact above this magnet any power supply to the magnet 'Mo locked for the upward movement.

As soon as the engine is switched on, the relay R3 is energized;, it opens its contacts, rendering all push buttons ineffective.

When moving the elevator from the third to the first floor. the switch of the floor switch flipped; d2 and d3 come with the lower ones Contacts in contact, and de comes into the middle position, whereby the circuit the motor is interrupted. The relay Re closes its contacts again, so that that is, when the elevator is not in the correct stop position, i.e. c is not against b2, the M.Dtor can be switched on again. For example, forms the sliding contact c contact with b1, a circuit is closed by S via h, v2, contacts of R1, line i, sliding contact c, contact b1, line 15, lower Contact above the magnet Mo, winding of M, branch point 14 and further, like was stated above. As soon as the sliding contact c reaches the contact b2, the Motor switched off.

With the contacts b2 lines are still connected to the signal lamps on the different floors.

On each floor there are also two signal lamps that indicate in which direction the elevator may be moving by interacting with the upper set of contacts of the switching magnets Mo and Mn. The circuits of all lamps are led via the fuses v3 and v4.

The system can be designed for both direct and alternating current will.

Claims (1)

PATENT CLAIMS: i. Fine adjustment for electric elevators, in which the car is set in motion again by automatically closing an auxiliary circuit and in the stop position ( at the level of the relevant floor), the elevator motor being applied to the same power source as for normal operation when the auxiliary circuit is closed, characterized in that a time relay (R1) is provided which controls the otherwise open auxiliary circuit a certain time after Switching off the normal control circuit closes and that a second timing relay (R2) is also arranged, which prevents the effect of the normal control and which works with a greater delay than the relay (R1). a. Electric elevator according to Claim z, characterized in that the relay (R2), which prevents the normal control from working, works with less delay than the switching magnets (Ma, Mn) for the upward and downward movement.