KR910008137Y1 - Safety circuit of converter elevator - Google Patents

Abstract

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Description

Safety circuit of conveyor mounted elevator

1 is a schematic diagram of a conveyor mounted elevator.

2 is a block diagram of an exit side conveyor.

3 is a conventional control circuit diagram.

4 is a conventional motor drive circuit diagram.

5 is a control circuit diagram of the present invention.

6 is a motor driving circuit diagram of the present invention.

7 is an operation timing chart for the control circuit of the present invention.

* Explanation of symbols for main parts of the drawings

A: Conveyor drive command relay B: Main contactor

PH ₁ , PH ₂ , PH ₃ : Optical Sensor TR: Trip Coil

N ₅ : Motor T: Timer

Bn: Main contactor auxiliary contact

The present invention relates to a safety circuit of a conveyor-mounted elevator, and the main focus is on enabling safe driving by preventing accidents that frequently occur when the conveyor is stopped.

Conventional conveyor drive motor control circuit is configured such that the motor is also driven only by the open / close signal of various sensors mounted around the conveyor, so that malfunctions such as the contact of the main contactor are fused and the cargo in operation falls. The risk of accidents is high. For example,

FIG. 1 illustrates an example of a five-story structure, in which a freight (P ₅ ) on the fifth floor is driven by a gate conveyor (GC ₅ ) and loaded into the elevator (CAR) while the elevator (CAR) is waiting. Wherein the shoe SH ₅ is a mechanical device for limiting the allowable size when the cargo P ₅ is loaded on a conveyor CC mounted on an elevator CAR and FEN is an access control device. In the gate conveyor (GC ₅ ) and the non-driven conveyor (NC ₅ ) at the front of the door (DR ₅ ), there is a photoelectric sensor (PH ₁ , PH ₂ , PH ₃ ) to detect the presence of the product as shown in FIG. ) Was installed.

In this case, the motor M ₅ is used to drive the gate conveyor, and the limit switch LS is intended to back up when the optical sensor PH ₃ malfunctions.

3 shows a control circuit of the gate conveyor driving motor M ₅ , which is mounted on the contact point PH _1a and the gate conveyor GC ₅ of the optical vibration sensor PH ₁ mounted on the non-driven conveyor NC ₅ . Of the conveyor drive command relay (A) by connecting the contact b (PH _2b ) of the optical sensor (PH ₂ ) to discriminate the presence or absence of a product on the gate conveyor (GC ₅ ) in series and connecting it to the conveyor drive command relay (A). The circuit was constructed.

The magnetic contact Aa of the conveyor driving command relay A and the b contact PH _3b of the optical sensor PH ₃ on the gate conveyor GC ₅ and the b contact LS _b of the limit switch LS are in series. Connected to the self-holding circuit of the relay (A).

The main contactor B for motor drive connects the contact aa of the conveyor drive command relay A to the relay A, and the main contactor B is input to supply power to the motor M _{5 of} FIG. (R, S, T) was supplied via the switch FFB ₁ to drive the motor M ₅ .

Referring to the operation of the conventional conveyor drive control circuit as described above, when the cargo P ₅ passes through the photoelectric sensor PH _{1 in} FIG. 2, the contact point PH _1a is fermented to the gate conveyor GC ₅ . If there is no cargo, the contact b (PH _2b ) of the optical sensor (PH ₂ ) is also in a ferro state, so the conveyor drive command relay (A) is fed in and the main contactor (B) is fed in by the contact (Aa), so that the motor (M ₅ ) Driven.

If the cargo (P ₅ ) is moved in the direction of the arrow, the cargo (PH ₃ ) moves and the conveyor driving command relay (A) is self-holding through the circuit (Aa-PH _3b -LS _b ) even if the optical sensor (PH _3b ) is activated. So the cargo (P ₅ ) will continue.

When the cargo P ₅ reaches the position of the optical sensor P ₅ , the contact point PH ₂ opens and the relay A is released, and the main contactor B is also released so that the driving motor M ₅ rotates. Stop and the cargo P ₅ is stopped.

The limit switch LS is an auxiliary means for stopping the conveyor even when the optical sensor PH ₃ malfunctions.

Thus, the conventional conveyor drive control circuit can achieve the purpose when the operation of the main contactor (B) is not abnormal, but the welding of the main contact (B ₁ ), (B ₂ ) according to the frequent opening and closing operation of the main contactor (B) In the event of a problem such as an accident or the mover being mechanically constrained, the seat preventive command of the electrical command relay (A) is impossible by the sensor, and the main contact points (B ₁ ) and (B ₂ ) of the main contactor (B). ), There was always a risk of an accident that would cause the conveyor to continue to move the cargo without falling down, causing the cargo to fall.

The present invention has been made in order to solve the conventional problems as described above, and to prevent the fall of the cargo even in the case of restraint or tangential adhesion of the main contactor controlling the conveyor drive motor as described in accordance with the accompanying drawings as follows. .

As shown in FIG. 5, a contact point PH _1a of the photosensor PH ₁ mounted on the non-driven conveyor NC ₅ and the gate conveyor GC ₅ are used to determine the presence or absence of cargo on the gate conveyor GC ₅ . The conveyor drive command relay (A) is connected via the b contact (PH _2b ) of the optical sensor (PH ₂ ).

It is connected to the main contactor (B) via the contact a (Aa) of the conveyor driving command relay (A) and simultaneously connected to the relay (A) through the optical sensor (PH _3b ) and the repeat switch b contact (LS _b ). do.

In addition, as a time counter condition circuit of the timer circuit T which has been released from the main contactor, it is connected to the timer T via the contact _b of the conveyor drive relay A and the main contactor auxiliary contact Bn. The automatic trip coil TR for switching the power switch FFB ₂ of the motor 5 of FIG. 6 is excited by the contact T ₁ of T), and the power switch FFB _{2 of} FIG. The power is applied to the motor M ₅ via the contacts B ₁ and B ₂ .

The time charts of the relay A and the main contactor B are shown.

If in this way configured normal operation as shown in the present design is based on the 7-degree timing chart is the conveyor drive command relay (A), the motor (M ₅₎ and the operating state contactor (B) by the contact point (Aa) woman when When the power is cut off as the contacts B ₁ and B ₂ , but not in normal operation, that is, when the main contactor B is constrained or the contacts B ₁ and B ₂ are bonded, the power supply of the motor M ₅ is supplied. In this state, the drive command relay A is released and the auxiliary contact point Bn of the main contactor is turned on, that is, the timer B (a contact point Bb of the relay A and the auxiliary contact point Bn) is blocked. Let T) work.

Therefore, after the timer T counts for the set time (about 150 약), the trip coil TR is excited via the contact T ₁ to cut off the power supply of the motor M ₅ as the switch FFB ₂ . It becomes possible.

Therefore, the power supply of the motor M ₅ can be cut off regardless of the opening and closing of the contacts B ₁ and B ₂ by the main contactor B.

As such, the present invention enables the power supply of the motor M ₅ to be cut off as the auxiliary contact Bn even when the main contactor B controlling the conveyor drive motor M ₅ is locked or welded. It is useful to improve reliability by preventing cargo damage or falling accidents.

Claims (1)

A conveyor driving command relay (A) and a main contactor (B) configured to open and close the power supply of the motor (M ₅ ) by the contacts (B ₁ , B ₂ ) of the main contactor (B); In order for the main contactor B to cut off the power of the motor M _{5 at} all times, the timer T is driven through the b contact Ab of the relay A and the auxiliary contact Bn of the main contactor. Safety circuit for a conveyor-mounted elevator, characterized in that the trip coil (TR) that cuts off the power of the motor (M ₅ ) by the timer contact (T ₁ ) is excited.