JPH0549771U - Elevator driving equipment - Google Patents

Abstract

(57) [Summary] [Purpose] When the elevator overspeeds and makes a safe stop, guide the car to the nearest floor safely regardless of the operation of the emergency stop device. [Structure] Short circuit Bb1, Hb1 for short-circuiting the safety stop circuits Aa2, Ua when the operation of the overspeed switch 7 is detected.
And a nearest floor ascending operation circuit E for guiding the car 3 to the nearest floor by a low speed ascending operation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an elevator driving device, and more particularly to an elevator driving device that safely stops a car when an overspeed of the car is detected.

[0002]

[Prior Art]

 The elevator is equipped with a speed governor, and when the speed governor detects that the speed of the car exceeds a predetermined value, the car stops suddenly to ensure the safety of passengers, and the elevator The operation is stopped. In this case, a maintenance engineer is dispatched to the site from the monitoring center of the elevator that received the report of the abnormality, and rescues the passengers trapped in the car. In order to speedily rescue passengers when such a situation occurs, it is disclosed in JP-A-51-137252 that the speed of the elevator car exceeds a predetermined value set in advance. Detected, and after a certain time after the car suddenly stopped, the governor operation was resumed, the car was restarted at a low speed to drive to the predetermined floor, and the elevator door was opened at the predetermined floor. A rescue operation device that is in an idle state is disclosed.

[0003]

[Problems to be solved by the device]

 In the rescue operation device disclosed above, the car is operated by energizing the relay in conjunction with the operation of the governor, opening the contact of this relay, and cutting off the power supply to the elevator control circuit. Has stopped suddenly. Then, after a lapse of a predetermined time from the stop of the car, the contacts of the relay are forcibly short-circuited and the car is restarted to operate to a predetermined floor. In this case, the car is restarted regardless of the operation of the emergency stop device of the elevator, and the car may not be started.The car may be lowered while the emergency stop device is operating. If restarted, the sheave will slip, and friction with the rope may cause abnormal wear in the groove of the sheave or cause a secondary disaster such as the rope breaking, which is dangerous.

An object of the present invention is to provide an elevator operating device that can safely guide a car to the nearest floor when the car suddenly stops, regardless of the operation of the emergency stop device.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the present invention provides an overspeed switch that operates when a governor detects an overspeed of a car, and a safety stop circuit that safely stops the car by operating this overspeed switch. When the operation of the overspeed switch is detected, an elevator operating device having a switch circuit that activates the short-circuit circuit that short-circuits the safety stop circuit and the circuit that causes the car to run at a low speed, and stops at the nearest floor. It is equipped with an uphill driving circuit.

[0006]

[Action]

 With this configuration, when the elevator goes into an overspeed state and the overspeed switch operates and the car stops safely, the short-circuit circuit short-circuits the safety stop circuit and the nearest floor ascending operation circuit starts. Therefore, the car is guided to the nearest floor by low-speed ascending operation and stopped with the door open. As a result, it is possible to prevent accidents trapped in the car due to the operation of the overspeed switch, and also to prevent the occurrence of secondary accidents while inviting you to the nearest floor.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 is an explanatory view showing an embodiment of the present invention, FIG. 2 is a circuit diagram of this embodiment, and FIG. 3 is a perspective view of a speed governor of this embodiment.

In FIG. 1, reference numeral 1 denotes a hoisting machine, and a rope 2 is wound around the hoisting machine 1 and a car 3 and a counterweight 4 are fixed to both ends of the rope 2 respectively. By driving, the car 3 operates in the hoistway in conjunction with the counterweight. In the figure, 5 is a speed governor, and the car 3 is linked to the speed governor 5 via a rope 6. The speed governor 5 is provided with a switch 7 that operates when detecting that the operating speed of the car 3 has reached 125% of the specified operating speed, and the normally closed contact 7b is turned off by the operation of this switch 7. It is supposed to be.

The speed governor 5 has a shape as shown in FIG. 3, the switch 7 is attached to a side portion of the upper surface, and the operation speed of the car 3 is regulated on one side surface of the lower portion. When the speed reaches 135%, a weight 8 is installed to operate the elevator emergency stop device. When the weight 8 operates and the car 3 descends, an emergency stop device (not shown) provided in the car 3 operates. Then, the car 3 is mechanically locked and stopped. When unlocking the mechanical lock of the car 3, the normal car 3 is lifted.

The electric circuit of the present embodiment has a configuration shown in FIG. 2, in which the normally closed contact 7b of the switch 7 and another normally closed contact of a safety switch such as a stop switch (not shown) are connected between the power supplies P and N. 9b, a normally-closed contact 10b of the rescue switch (not shown), and a safety switch operation detection relay A having normally-open contacts Aa1 and Aa2 are connected in series. Further, an overspeed switch operation detection relay B having a normally closed contact Bb1 is connected between the connection point of the normally closed contacts 7b and 9b and the power source N. Further, a normally open contact Aa1 and an operation circuit C for raising and lowering the elevator are connected in series between the power supplies P and N, and the safety switch operates to turn off the safety switch operation detection relay A. Then, the elevator is stopped. Further, a normally open contact Aa2, a normally open contact Ua of an ascending operation command relay (not shown) for instructing the ascending operation of the elevator, and a low speed ascending operation circuit E for making the elevator ascend at a low speed are connected in series between the power supplies P and N. In addition, between the connection point of the normally open contacts Aa2 and Ua and the power supply N, a normally open contact Da of a descending operation command relay (not shown) for instructing the descending operation of the elevator and a low speed descending operation circuit F for causing the elevator to descend at a low speed. Are connected in series, and between the power supply P, the normally open contact Ua, and the connection point of the low-speed up-and-down operation circuit E, the normally-closed contact Bb1 and the normally-closed contact Hb1 which are connected in series are connected. .. Further, normally-open contacts G 1a to GNa of a position detection relay (not shown) which are normally-open contacts connected in parallel between the power sources P and N and are energized when the car 3 reaches the landing position of each floor. , A floor position detection relay H having a normally closed contact Hb1 is connected.

Next, the operation of the embodiment having such a configuration will be described. If the operating speed of the car 3 reaches 125% of the specified operating speed for some reason immediately after the car 3 starts to rise from the first floor, the governor 5 detects this and the switch 7 operates, and the normally closed contact point is reached. Since 7b is opened, the circuit of P-7b-9b-10b-AN is opened, and the safety switch operation detection relay A is deactivated. At the same time, the P-7b-BN circuit is opened, and the overspeed switch operation detection relay B is deactivated. When the safety switch operation detection relay A is de-energized, the normally open contact Aa1 is turned off, the circuit of P-Aa1-C-N is opened, the power supply to the driving circuit C is cut off, and the car 3 is in the safe stop state. And Further, when the elevator is operated at a low speed ascending operation or a low speed descending operation, it is usually performed by a circuit of P-Aa2-Ua-EN or a circuit of P-Aa2-Da-F-N. However, since the normally open contact Aa2 is open, the low speed ascending operation and the low speed descending operation are not performed. Here, the circuit of P-Bb1-Hb1-E-N is formed, and the car 3 runs toward the second floor in the low speed ascending operation. When the car arrives at the landing position on the second floor, the position detection relay G2 on the second floor (not shown) is energized, so that the P-G2a-H-N circuit is formed and the floor position detection relay H is energized. The car 3 opens at the second floor level and stops.

[0012]

[Effect of the device]

 According to the present invention, when the car is overspeeded and brought to a safe stop, the car is guided to the nearest floor by the low speed ascending operation, so that the operation of the overspeed switch causes the car to enter the car. It is possible to prevent accidents that may be trapped and prevent secondary disasters while guiding to the nearest floor.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of an elevator operating device of the present invention.

FIG. 2 is a circuit diagram of an elevator operating device.

FIG. 3 is a perspective view of a speed governor.

[Explanation of symbols]

 7 Switch A Safety switch operation detection relay B Overspeed switch operation detection relay Bb1 Overspeed switch operation detection relay normally closed contact H Floor position detection relay Hb1 Floor position detection relay normally closed contact E Low speed rising operation circuit

Claims (1)

[Scope of utility model registration request] 1. An elevator driving apparatus having an overspeed switch that is activated when a governor detects an overspeed of a car, and a safety stop circuit that safely stops the car by operating the overspeed switch. A short circuit that short-circuits the safety stop circuit when the operation of the overspeed switch is detected, and a nearest floor ascending operation circuit that activates a circuit that causes the car to run at a low speed and stops at the nearest floor An elevator driving device characterized in that