JPH0532306B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Description of the Technical Field] The present invention relates to a protection device for a rope-suspended elevator, and more particularly to a protection technique at the time of rope slip.

[Technical background of the invention and its problems]

Figure 1 is a schematic diagram of the elevator system configuration, where 1 is a hoisting machine, 2 is an electric motor, 3 is a main sheave, and 4
5 is an elevator car, 6 is a counterweight, 7 is a position detection device, 8 is an elevator control device, and 9 is a rope. The elevator car 5 controls the electric motor 2 by the elevator control device 8 to drive and rotate the hoist 1, and the main sheave 3,
Raised by the rope 9 suspended from the deflection sheave 4,
Drive down. A groove is provided in the main sheave 3 to prevent the rope from slipping.

Now, when the electric motor 2 is rotating under the control of the elevator control device 8, the rope 9 slips on the main sheave 3 due to wear and deformation of the groove in the main sheave 3 due to long-term use, and the elevator car 5 is actually damaged. If the target does not move, if this situation connects, rope 7
wear becomes significant, and in the worst case, the rope 9 is severed, causing the elevator car 6 and the hanging weight 5 to fall freely, which is extremely dangerous.

Therefore, it is necessary to detect rope slip under elevator operating conditions and to stop elevator operation within the allowable rope slip time.

[Purpose of the invention]

The present invention has been made in view of the above points, and the rope of a rope-suspended elevator, in which the rope is suspended from the main sheave of the hoist, slips on the main sheave, causing the elevator car to substantially move. To provide a protection device for an elevator that prevents a rope from being cut when there is no rope.

[Summary of the invention]

The present invention provides an elevator for controlling a rope-suspended elevator in which a rope is suspended from the main sheave of a hoisting machine, a car is attached to one end of the rope, and a counterweight is attached to the other end. For example, the position detection relay that detects the nearby position and the main sheave of the hoisting machine
The floor where the elevator is located receives the output of the logical product of the output of the speed detection relay, which operates when the rotation speed reaches a predetermined rotation speed of approximately 1/30, and the output of the driving direction relay that determines the driving direction of the elevator. The elevator travel floor area detection relay is set by the operation of the position detection relay for the first floor the elevator reaches, and is reset by the operation of the position detection relay for the first floor the elevator reaches. A relay is provided for each area (the area in which the elevator travels from a certain floor to the first floor it reaches the next floor), and one of these relays to detect the area of the elevator operates and operates after a predetermined period of time has elapsed. The above object is achieved by outputting a stop signal to the elevator when both the time-limited relay and the traveling operation relay for issuing a traveling operation command for the elevator operate.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of the present invention. In Fig. 2, PN is the bus bar of the control power supply, and 10 is the protective device: parking switch, pit safety switch, emergency stop switch, safety link switch, rescue exit limit switch, tape cutting limit switch,
A protection circuit is composed of a final limit switch, a governor switch, etc. 11 stops the elevator by releasing the electromagnetic contactor for the operation control circuit. Reference numeral 12 is a rope slip detection relay, and reference numeral 13 is a time limit relay, which sets a time limit so that when a rope slip occurs on the main sheave, this rope slip operates within an allowable time. 14 is a normally open contact of a travel operation relay (not shown) that gives a travel command to the elevator, and 16 is a normally closed contact of an inspection operation detection relay (not shown).
24 is a movable brush provided on a floor selector (not shown); 17 is a fixed segment provided in the vicinity of the floor of the same floor selector, which corresponds to the number of floors; the movable brush 24 and the fixed segment 17 allow , and the position detection relays 18 to 20 on each floor (this example shows the case of the third floor) are operated. Reference numeral 23 denotes a normally open contact of a running direction relay (not shown) that determines the running direction of the elevator, and this example shows an upward direction relay.

15 is a speed detection relay operated by the output of a finger speed generator directly connected to the main sheave of the hoisting machine via a gear etc., and 21 and 22 are respectively running floor area detection relays. In the figure, 12-16, 19-26, etc. represent normally closed contacts of relays 12 and 19, respectively.
12-2a, 19-1a, etc. are each relay 1
2 and 19 are shown as normally open contacts, and the others are expressed in the same way.

The circuit constituted by the contact points of the operating direction relay (ascending direction) 23, the speed detection relay 15, the traveling floor area detection relays 21 and 22, and the position detection relays 18 to 20 is a circuit that operates when the elevator is in ascending operation, and when the elevator is in descending operation. A similar circuit is also constructed, although not shown.

Hereinafter, the circuit will be explained on the assumption that a rope slip occurs while the elevator is in service between a floor where the position detection relay 18 is installed and a floor where the position detection relay 19 is installed.

There is a call at the floor of the position detection relay 19, and the motor 2 is controlled by the operation control device 8 shown in Fig. 1, and the hoist 1 is driven and starts rotating, but if rope slip occurs for some reason, Due to the operation of the rising direction detection relay 23 and the speed detection relay circuit that detects that the motor is rotating,
The travel floor area detection relay 21 operates. Since the elevator is not moving at this time, the normally closed contact 19-2 of the traveling floor area detection relay 21 position detection relay 19
The circuit of the time-limiting relay 13 is operated by counting a preset time through the normally open contact 21-2a. When the time-limited relay 13 is activated, since the inspection operation is not in progress, the rope slip detection relay 12 is activated by 14-16-13-1a, and the circuit of the electromagnetic contactor 11 for the operation control circuit is immediately disconnected to stop the elevator. be able to. Further, once the rope slip detection relay 12 is activated due to the self-holding circuit of its own normally open contact 12-2a, it cannot be reset until after inspection and confirmation.

Note that even if a rope slip occurs, if the slip is small and the elevator reaches the floor of the position detection relay 19 before the time-limited relay 13 operates, the normally closed contact 19-2b of the position detection relay 19 will detect the running floor area. Relay 21 is reset,
Since the timer element (not shown) is reset before the timer relay 13 is also activated, the elevator can operate normally. Although the explanation was given for upward operation, the same circuit configuration can be used for downward operation (circuit diagram not shown).

〔Effect of the invention〕

As explained above, by carrying out the present invention, a rope slip is detected and elevator operation is promptly stopped, thereby preventing rope wear and preventing an accident in which an elevator car falls due to rope breakage or an accident caused by a cut rope falling. can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an elevator system configuration, and FIG. 2 is a diagram showing an embodiment of the present invention. 1...Hoisting machine, 2...Electric motor, 3...Main sheave, 4...
Deflection sheave, 5... Car, 6... Counterweight, 7... Floor selector, 8... Elevator control device,
9... Rope, 10... Protective device, 11... Magnetic contactor for operation control circuit, 12... Rope slip detection relay, 13... Time limit relay, 14... Normally open contact of travel operation relay, 15... Normally open contact of speed detection relay ,1
6... Normally closed contact of inspection operation relay, 17... Fixed segment for position detection, 18 to 20... Relay for position detection, 21 and 22... Traveling floor area detection relay, 2
3... Operating direction relay (upward direction), PN... Control bus bar, 24... Movable brush for position detector.

Claims (1)

[Claims] 1. In a rope-suspended elevator in which a rope is suspended from the main sheave of a hoist and a car is attached to one end and a counterweight is attached to the other end, a position detection relay that detects the position near each floor, and a The operation of the position detection relay of the floor where the elevator is located receives the output of the logical product of the output of the speed detection relay that operates when the rotation speed reaches a predetermined rotation speed or higher and the output of the driving direction relay that determines the driving direction of the elevator. The relay is set and reset by the operation of the relay for detecting the position of the first floor to be reached.The relay for detecting the floor area of the elevator is installed for each floor area for each driving direction, and the relay for detecting the position of each floor area is received. A time-limited relay that operates after a predetermined time has elapsed; a travel-operation relay that issues a travel operation command to the elevator; and a travel-operation relay that operates based on the output of the logical product of the output of this travel-operation relay and the output of the time-limit relay to issue a stop signal to the elevator. An elevator protection device characterized by being equipped with a rope slip detection relay that outputs.