JPH10139312A - Measuring device for extension of rope for hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the measurement of extension in a rope under a normal operation condition. SOLUTION: Between signal output sections of a plunger position detector 7 detecting that a plunger 4 has reached a specified position and outputting the signal and an elevator car position detector 11 detecting that a car 1 has reached a specified position and outputting the signal, there are provided an adder 16 adding an output signal of a rotary encoder outputing a signal according to the elevation quantity of the car 1, a storing unit 17 storing the value operated by the adder 16, and a converter 18 reducing the value stored in the storing unit 17 and converting it into the extension quantity of a rope. Accordingly, the measurement of extension of rope is normally carried out during the running operation of an elevator, thereby enabling the tightening of rope before the rope elongates and the car does not reach an uppermost floor level and also saving the measurement of elongation of rope.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rope elongation measuring device for a hydraulic elevator.

[0002]

2. Description of the Related Art Conventionally, an apparatus for detecting a rope elongation of a car of a hydraulic elevator is disclosed in Japanese Patent Publication No. 6-96435, which discloses that the car reaches a specific position when the hydraulic elevator is maintained at a low speed by a maintenance operation. Measurement start means for starting measurement by an existing rotary encoder when the position is detected by the position detection means for detecting; measurement stop means for stopping measurement by the rotary encoder when the plunger reaches a predetermined position; And output means for outputting a measured value by a rotary encoder from when the measurement start means operates to when the measurement stop means operates.

[0003]

In the above prior art, the elevator must be switched from normal operation to maintenance operation, and the up limit switch for preventing the elevator from rising excessively is short-circuited. If the passengers are inconvenienced or forget to restore the short-circuited up-limit switch, the passengers will not be stopped in the event of over-elevation and passengers will be trapped inside the elevators. There is a problem that it becomes a factor or that it takes time to perform a setup work for measurement and a check work at the end.

[0004] It is an object of the present invention to provide a rope elongation measuring device of a hydraulic elevator capable of measuring the rope elongation in a normal operation state.

[0005]

In order to achieve the above object, a rotary encoder for outputting a signal in accordance with the amount of elevation of the car, and a signal output when the car reaches a predetermined position is output. In a rope elongation measuring device of a hydraulic elevator, which has a car position detecting device that performs lifting and lowering of the plunger via a rope, the device detects that the plunger has reached a predetermined position. A plunger position detecting device for outputting a signal, an adding device for adding an output signal of the rotary encoder between a signal output of the car position detecting device and a signal output of the plunger position detecting device, and storing a value calculated by the adding device. It has a storage device and a conversion device for subtracting a value stored in the storage device and converting the value into a rope elongation amount.

[0006] With this configuration, the rope elongation can be measured by the amount of change of the added value of the output signal of the rotary encoder between the detection signals of the car position detecting device and the plunger position detecting device, and the rope elongation amount can be measured. Since the measurement is always performed while the vehicle is running, the rope can be tightened and cut down before the car is extended and the car does not reach the level of the top floor, and the rope elongation measurement can be saved.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an apparatus for measuring rope elongation of a hydraulic elevator according to the present invention.

FIG. 1 is a side view showing the entire configuration of a hydraulic elevator rope elongation measuring apparatus according to an embodiment of the present invention.

A hydraulic cylinder 3 is installed at the bottom of the hoistway 2, and a plunger 4 having a pulley 5 at an upper end drives the inside of the hydraulic cylinder 3. A rope 6 having one end connected to the hydraulic cylinder 3 and the other end connected to the car 1 is wound around the pulley 5. A connecting body 10 that moves as the car 1 moves up and down is wound around a pulley 9 above the hoistway 2, and is wound around a rotary encoder 8 at the bottom of the hoistway 2. This rotary encoder 8 is connected 10
It rotates and emits signals such as pulses.
The magnetic sensor 11a mounted on the car 1 and the shield plate 11b provided on the hoistway 2 make the car position detecting device 1
1 and the car is a predetermined floor 12 such as the lowest floor, for example.
Has reached the specified position. A micro switch 7a is mounted on the wall of the hoistway 2 and a cam 7b mounted on the pulley 5 constitutes a plunger position detecting device 7.

A measuring circuit 13 disposed in the machine room
Is composed of an adder 16 for adding the output signal of the rotary encoder 8, a gate circuit 14 for inputting an output signal of the plunger position detecting device 7, a gate circuit 15 for inputting an output signal of the car position detecting device 11, and an adding device 16. A storage device 17 for storing the calculated value, a conversion device 18 for subtracting the value stored in the storage device 17 to convert the value into a rope elongation, and an output device for outputting the value converted to the rope elongation by the conversion device 18 19.

According to the hydraulic elevator having such a configuration, when the plunger 4 is moved up and down by the driving device (not shown) and the car 1 moves to the lowest floor, it reaches a predetermined controlled stop position on the lowest floor. Shortly before the plunger position detecting device 7 was activated and its signal was issued, the car 1
Is measured by the rotary encoder 8 until the car position detecting device 11 attached to the vehicle operates. By comparing this measurement result with the initial value stored in the storage device 17 in advance, the elongation of the rope can be known. Here, the plunger position detecting device 7 can perform the predetermined operation on the predetermined floor 1 for both the ascent operation and the descent operation even if the predetermined floor 12 is an intermediate floor.
The cam 7 operates so as to be slightly before reaching the specific position 2.
b is attached. The initial value stored in the storage device 17 is, for example, an initial value stored after the completion of elevator work.

Next, the control circuit 13 will be described.

Output signals from the plunger position detecting device 7 and the car position detecting device 11 are input to a gate circuit 14 and a gate circuit 15, respectively. The adder 16 starts adding the pulse output signal of the rotary encoder 8 by the output of the gate circuit 14 and ends the addition by the output of the gate circuit 15. Therefore, when the car 1 approaches the predetermined stop position on the lowest floor, the plunger position detecting device 7 operates to supply an output signal to the gate circuit 14, and the addition of the pulse output signal of the rotary encoder 8 starts. After a while, the car 1 reaches a predetermined stop position on the lowest floor, and the car 1
1 is detected and applied to the gate circuit 15 and the addition of the pulse output signal of the rotary encoder 8 is completed. During this time, since the pulse signal calculated by the adding circuit 16 is proportional to the moving distance of the car 1, the pulse signal is compared with the initial value stored in the storage device 17 in advance and sent to the output device 19 via the conversion device 18. The extension amount of the rope 6 is output as numerical data.

Such a rope elongation measuring apparatus can be applied to various models by combining the plunger position detecting device 7, the car position detecting device 11 and the rotary encoder 8.

[0015]

According to the present invention, the rope elongation can be measured by the change amount of the added value of the output signal of the rotary encoder between the detection signals of the car position detecting device and the plunger position detecting device, and the rope elongation amount can be measured. Since the measurement is always performed while the vehicle is running, the rope can be tightened and cut off before the car is extended and the car does not reach the level of the top floor, and the rope elongation measurement can be omitted.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a rope elongation measuring device of a hydraulic elevator according to one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 car 4 plunger 6 rope 7 plunger position detecting device 8 rotary encoder 11 car position detecting device 13 measuring circuit

Claims (3)

[Claims] 1. A plunger, comprising: a rotary encoder that outputs a signal in accordance with an amount of elevation of a car; and a car position detection device that detects that the car has reached a predetermined position and outputs a signal. A hydraulic elevator rope elongation measuring device which raises and lowers the car via a rope, detects that the plunger has reached a predetermined position and outputs a signal, and a plunger position detecting device. An addition device for adding the output signal of the rotary encoder between the car position detection device and the signal output of the plunger position detection device, a storage device for storing a value calculated by the addition device, and a value stored in the storage device. And a conversion device for subtraction and conversion into a rope elongation amount. A rope elongation measurement device for a hydraulic elevator. 2. The system according to claim 1, wherein the start of addition and the end of addition of said adding device are switched by output signals of said car position detecting device and said plunger position detecting device by raising and lowering of said car. For measuring the rope elongation of hydraulic elevators. 3. The apparatus according to claim 1, wherein the storage device specifies and stores an initial value.