JPH07206319A - Automatic tension adjusting device for main rope - Google Patents

Abstract

PURPOSE:To adjust the tension of a main rope automatically and correctly by providing a hydraulic jack for stopping the end part of the main rope in an elevator and controlling the opening and closing of a solenoid valve and the drive of an oil pump according to the pressure in the interior of the hydraulic jack. CONSTITUTION:Main ropes 9a, 9b are connected to hydraulic jacks 26a, 26b as a rope stopping part 6A installed on a machine table 3 by pins 16a, 16b, and pressure sensors 27a, 27b are provided for detecting the pressure in the hydraulic jacks 26a, 26b. The output voltages of the pressure sensors 27, 27b are input to an arithmetic unit 20, A/D converted, and compared with a reference value stored in a memory. If it is determined that it is necessary to adjust tension, control signals for an oil pump 24 and solenoid valves 25a, 25b are generated by an output control part, and the respective control signals are given to the oil pump 24 and the solenoid valves 25a, 25b, whereby the hydraulic jacks 26a, 26b are elongated and contracted to adjust the tension of the main ropes 9a, 9b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic tension adjusting device for a main rope in an elevator such as 2: 1 roping.

[0002]

2. Description of the Related Art Conventionally, in order to eliminate the imbalance of the main rope tension (tension) of 2: 1 roping, it is necessary to confirm the tension balance by hand and to adjust the tension by the nut of the rope stopper. It was

The structure of a conventional 2: 1 roping elevator will be described with reference to FIG. FIG. 7 is a diagram showing a schematic overall configuration of a conventional 2: 1 roping elevator.

In FIG. 7, 1 is a machine room of an elevator installed on the roof of a building, 2 is a control panel provided in the machine room 1, 3 is a machine stand placed on the floor of the machine room 1, and 4 is a machine table. A hoisting machine installed on the machine base 3, 5 is a sheave connected to the hoisting machine 4, and 6 and 7 are rope stoppers.

Further, 8 is a hoistway, 9 is a main rope provided in parallel with three to six, 10 is a counter suspension vehicle suspended from the main rope 9, and 11 is connected to the shaft of the counter suspension vehicle 10. A counter, 12 is a car suspension car suspended from the main rope 9, and 13 is a car connected to the shaft of the car suspension car 12.

FIG. 8 shows the rope stoppers 6 and 7 shown in FIG.
FIG. 3 is an enlarged view showing a partial cross section of FIG. In the figure, 14 is a nut, 15 is a coil spring, 16 is a pin, and 17 is a simple rod.

Next, the conventional work of adjusting the tension of the main rope will be described. In most cases, about three to six main ropes 9 are used in the elevator. So 2:
In the one-roping elevator, in order to eliminate the imbalance of the rope tension of each of the plurality of main ropes 9, first, the worker A, who is on the car 13 of the elevator, pulls the main ropes 9 one by one and Check the tension imbalance by and select the main rope 9 to be adjusted.

Next, in the machine room 1, the worker B tightens or loosens the nut 14 of the rope stopper portion 6 or 7 of the main rope 9 with a spanner or loosens it.
Adjust the tension of. By repeating this adjustment work, it becomes possible to make the tensions of the plurality of main ropes 9 uniform.

[0009]

In the conventional work for adjusting the tension of the main rope as described above, it is necessary to confirm the imbalance of the tension by hand and adjust the tension of each of the main ropes 9. There was a problem of poor efficiency. In addition, there is a problem in that it requires empirical feeling and skill such as knacks, and that the judgments of workers are likely to vary due to individual differences.

The present invention has been made to solve the above-mentioned problems, and when the main rope tension is unbalanced, the main rope tension can be automatically and accurately adjusted. The purpose is to obtain a tension adjusting device.

[0011]

An automatic tension adjusting device for a main rope according to claim 1 of the present invention is provided with the following means. [1] An oil pump that supplies oil through a solenoid valve into the hydraulic jack that stops the end of the main rope. [2] Pressure detection means for detecting the pressure in the hydraulic jack. [3] Computing means for controlling opening / closing of the solenoid valve and driving of the oil pump so that the tensions of the plurality of main ropes are equalized based on the output of the pressure detecting means.

An automatic tension adjusting device for a main rope according to a second aspect of the present invention is provided with the following means. [1] An oil pump that supplies oil through a solenoid valve into a hydraulic jack that stops the end of each main rope. [2] A plurality of pressure sensors that detect the pressure of each of the hydraulic jacks. [3] Controlling the opening / closing of the corresponding solenoid valves and the drive of the oil pump so that the pressures in the plurality of hydraulic jacks become equal when the pressure difference exceeds a reference value based on the outputs of the plurality of pressure sensors A computing device that does.

An automatic tension adjusting device for a main rope according to a third aspect of the present invention is provided with the following means. [1] An oil pump that supplies oil through a solenoid valve into a hydraulic jack that stops the end of each main rope. [2] A plurality of pressure sensors that detect the pressure of each of the hydraulic jacks. [3] Controlling the opening / closing of the corresponding solenoid valves and the drive of the oil pump so that the pressures in the plurality of hydraulic jacks become equal when the pressure difference exceeds a reference value based on the outputs of the plurality of pressure sensors And, the average value is obtained based on the outputs of the plurality of pressure sensors, the internal load of the car is determined by comparing the average value with the pre-input car load value, and the determination data is obtained. An arithmetic unit that sends to the control panel.

An automatic tension adjusting device for a main rope according to a fourth aspect of the present invention is provided with the following means. [1] An oil pump that supplies oil through a solenoid valve into a hydraulic jack that stops the end of each main rope. [2] A plurality of pressure sensors that detect the pressure of each of the hydraulic jacks. [3] Controlling the opening / closing of the corresponding solenoid valves and the drive of the oil pump so that the pressures in the plurality of hydraulic jacks become equal when the pressure difference exceeds a reference value based on the outputs of the plurality of pressure sensors And an arithmetic unit for sending an elevator operation stop command to the control panel when the pressure difference exceeds the limit value based on the outputs of the plurality of pressure sensors.

[0015]

In the automatic tension adjusting device for the main rope according to the first aspect of the present invention, the oil is supplied by the oil pump through the solenoid valve into the hydraulic jack for stopping the end portion of the main rope. Further, the pressure in the hydraulic jack is detected by the pressure detecting means. Then, the arithmetic means controls the opening / closing of the solenoid valve and the drive of the oil pump so that the tensions of the plurality of main ropes are equalized based on the output of the pressure detecting means.

In the main rope automatic tension adjusting device according to the second aspect of the present invention, oil is supplied by the oil pump through the solenoid valve into the hydraulic jack that stops the end of each main rope. The pressure of each hydraulic jack is detected by a plurality of pressure sensors.
Then, the arithmetic unit opens and closes the solenoid valves and opens and closes the corresponding solenoid valves so that the pressures in the plurality of hydraulic jacks become equal when the pressure difference exceeds the reference value based on the outputs of the plurality of pressure sensors. Drive is controlled.

In the automatic tension adjusting device for a main rope according to claim 3 of the present invention, the plurality of hydraulic jacks are operated by the arithmetic unit when the pressure difference exceeds the reference value based on the outputs of the plurality of pressure sensors. The opening / closing of the corresponding solenoid valve and the drive of the oil pump are controlled so that the pressure inside becomes uniform, and the average value is obtained based on the outputs of the plurality of pressure sensors, and the average value is input in advance. The internal load of the car is judged by comparing it with the existing car load value, and the judgment data is sent to the control panel.

In the automatic tension adjusting device for a main rope according to a fourth aspect of the present invention, the plurality of hydraulic jacks are operated by the arithmetic unit when the pressure difference exceeds the reference value based on the outputs of the plurality of pressure sensors. The operation of the elevator is stopped when the opening / closing of the corresponding solenoid valve and the drive of the oil pump are controlled so that the internal pressure becomes even, and the pressure difference exceeds the limit value based on the output of the plurality of pressure sensors. Commands are sent to the control panel.

[0019]

【Example】

Example 1. The configuration of the first embodiment of the present invention will be described with reference to FIGS. 1 is a diagram showing a configuration of a first embodiment of the present invention. 2 is a block diagram showing the configuration of the arithmetic unit according to the first embodiment of the present invention. Note that the other configurations are similar to those of the conventional example, and in each drawing, the same reference numerals indicate the same or corresponding portions.

In FIG. 1, 20 is a CP as will be described later.
An arithmetic unit including U etc., 21 is an oil tank for storing oil, 22 is oil (oil), 23 is an oil pipe, and 24 is an oil pump for drawing out the oil 22 in the oil tank 21 under the control of the arithmetic unit 20. . Further, 25a and 25b are solenoid valves,
26a and 26b are hydraulic jacks attached to the machine base 3, and 27a and 27b are hydraulic jacks 26a and 26b.
Is a pressure sensor attached to. In addition, the main rope 9
a and 9b are hydraulic jacks 26 attached to the machine base 3.
a and 26b are connected to pins 16a and 16b. The hydraulic jacks 26a and 26b form the rope stopper 6A. Further, the device according to the first embodiment may be installed on the other rope stop portion (7).

In FIG. 1, solenoid valves 25a, 25b, hydraulic jacks 26a, 26b and pressure sensors 27a, 2 are shown.
Although only two 7b are drawn, actually 3 to 6 are provided depending on the number of the main ropes 9.

In FIG. 2, the arithmetic unit 20 includes an A / D converter 30 connected to the pressure sensors 27a and 27b.
And a CPU 31 connected to the A / D converter 30 and a CP
An interface (I / F) 35 connected to U31. However, the CPU 31 uses the tension determination unit 3 composed of software or the like registered in the ROM.
2 and an output control unit 33, and a memory 34 including a RAM and the like. In addition, the reference value of the pressure difference that requires the tension adjustment is previously input to the memory 34,
The interface 35 includes the oil pump 24 and the solenoid valve 2.
5a and 25b.

By the way, the pressure detecting means according to claim 1 of the present invention is composed of the pressure sensors 25a and 25b in the first embodiment, and the calculating means according to claim 1 of the present invention performs the operation in the first embodiment. It corresponds to the device 20.

Next, the operation of the above-described first embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the arithmetic unit 20 according to the first embodiment of the present invention.

The pressure sensors 27a and 27b detect the pressure inside the hydraulic jacks 26a and 26b and output a voltage corresponding to the pressure change. The voltage is calculated by the arithmetic unit 20.
Is converted into a digital signal by the A / D converter 30 and input to the tension determination unit 32 as numerical data.

The tension determination unit 32 is used for the hydraulic jack 2
Comparison of numerical data of pressure states 6a and 26b and comparison with a reference value stored in the memory 34 are executed. As a result, when it is determined that the tension adjustment is necessary, a signal to that effect is output to the output control unit 33.

The output control unit 33 generates control signals for the oil pump 24 and the solenoid valves 25a and 25b, and controls the oil pump 24 and solenoid valves 25a and 25b via an interface (I / F) 35.

For example, the pressure of the hydraulic jack 26a in which the tension of the main rope 9a is weak becomes low, and the pressure sensor 27a detects it. The arithmetic unit 20 generates a control signal based on the pressure change, drives the oil pump 24, and opens the solenoid valve 25a to open the hydraulic jack 26a.
The oil 22 is sent to the to adjust the tension.

Now, the operation of the arithmetic unit 20 shown in FIG. 3 will be described with reference to the flowchart. Hydraulic jack 26a
And 26b for a pressure difference (step 40),
If there is a pressure difference, it is compared with the reference value in the memory 34 (step 41). The reference value is, for example, a value obtained by increasing the normal pressure difference by 20%.

When the pressure difference exceeds the reference value, the hydraulic jack 26a or 26b to be adjusted is designated (step 42), and a drive command is issued to the oil pump 24 (step 43).

Next, an excitation command is issued to open the solenoid valve 25a or 25b corresponding to the designated hydraulic jack 26a or 26b (step 44).

In step 40 or 41, when there is no pressure difference or when the pressure difference does not exceed the reference value, the corresponding solenoid valve 25a or 25b is adjusted when the tension is adjusted.
An excitation command is issued to close the valve (step 46), and a stop command is issued to the oil pump 24 (step 47).

The process shown in FIG. 3 is executed at a constant cycle from the start of fully automatic operation at the start of system operation, and is not executed at the time of manual operation during inspection.

The first embodiment of the present invention, as described above,
The pressure sensors 27a and 27b detect unbalanced tensions of the plurality of main ropes 9 and the hydraulic pump 26a is controlled by the oil pump 24 under the control of the arithmetic unit 20.
Alternatively, by activating 26b, the unbalance of the main rope tension can be canceled automatically and accurately. By mounting the device according to the first embodiment,
Since the tension of the main rope 9 is automatically and accurately adjusted even during the elevator operation, it is not necessary to adjust the tension in the elevator maintenance work, and the productivity can be improved.

Example 2. The configuration of the arithmetic unit according to the second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of the arithmetic unit according to the second embodiment of the present invention.
Reference numeral 35 is similar to that of the first embodiment described above. Note that the configuration is the same as that of the first embodiment except for the arithmetic device 20A. Also,
In the drawings, the same reference numerals indicate the same or corresponding parts.

Referring to FIG. 4, the CPU 31A is the first embodiment.
Compared to the CPU 31 of FIG. The in-car load determination unit 36 is connected to the tension determination unit 32, the memory 34, and the control panel 2 installed in the machine room 1.

Next, the operation of the above-described second embodiment will be described. In the first embodiment, the output of the tension determining unit 32 is output only to the output control unit 33 in FIG. 2, but in the second embodiment, the output of the tension determining unit 32 in FIG. 4 is the output control unit 33 and the in-car load determination. Issued in section 36.
In the memory 34, the reference value of the pressure difference that requires tension adjustment in advance and the load value inside the car that can respond to the pressure change of the hydraulic jacks 26a and 26b due to the change in the number of passengers inside the car 13 and the amount of luggage are input. I'll do it.

The load value in the car is, for example, 13
When the average value of the outputs of the pressure sensors 27a and 27b when P is empty is P, it is W. Further, when the average value of the outputs of the pressure sensors 27a and 27b when the weight of the car 13 carrying X passengers is twice as high as when the car 13 is empty, it is set to 2W. And, it is assumed that they are proportional to each other.

The in-car load determination unit 36 inputs the pressure data of each of the hydraulic jacks 26a and 26b from the tension determination unit 32 and calculates the average value thereof. And
The average value is compared with the in-car load value to determine the internal load of the car 13, and the determination data is sent to the control panel 2.

The control panel 2 issues an overrun warning based on the sent judgment data, and controls the elevator by using the judgment data as a starting scale.

By mounting the apparatus according to the second embodiment, the scale apparatus has the scale apparatus, and it is not necessary to mount the scale apparatus under the car 13.

Example 3. The configuration of the arithmetic unit according to the third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing the configuration of the arithmetic unit according to the third embodiment of the present invention.
Reference numeral 35 is similar to that of the first embodiment described above. Note that the configuration is the same as that of the first embodiment except for the arithmetic device 20B.

In FIG. 5, the CPU 31B is the first embodiment.
The tension determination unit 32 is connected to the control panel 2 newly installed in the machine room 1 as compared with the CPU 31 of FIG.

Next, the operation of the above-described third embodiment will be described. For example, of the three main ropes 9, one main rope 9
If a trouble such as breakage or pin 16 falls off at, the pressure of the hydraulic jack 26 is abnormally decreased, and the pressure difference with the other hydraulic jacks 26 is abnormally increased. A numerical value of the pressure difference between the hydraulic jacks 26 that can determine that a trouble has occurred in the main rope 9 is previously input to the memory 34 as a limit value of the pressure difference.

In the flow chart shown in FIG. 6, the difference from the first embodiment is that a judgment item "Is the pressure difference exceeding the limit value?" Is added to step 52.

In step 52, if the pressure difference exceeds the limit value, the process proceeds to step 59 to output an elevator stop command to the elevator control panel 2.

When a precise inspection of the main rope 9 such as breakage of the main rope 9 or dropout of the pin 16 is required, the elevator according to the third embodiment is automatically stopped. As a result, it is possible to prevent the trouble of the main rope 9 which would cause a serious accident if the vehicle is driven as it is.

By the way, in the above description of each embodiment,
Although the case where the elevator is used for 2: 1 roping has been described, it goes without saying that the elevator can also be used for other elevators such as 1: 1 roping.

[0049]

As described above, the automatic tension adjusting device for a main rope according to claim 1 of the present invention includes an oil pump for supplying oil through a solenoid valve into the hydraulic jack for stopping the end portion of the main rope, and Pressure detecting means for detecting the pressure in the hydraulic jack, and arithmetic means for controlling the opening / closing of the solenoid valve and the drive of the oil pump so that the tensions of the plurality of main ropes are equalized based on the output of the pressure detecting means. Since it is provided with, the main rope tension can be automatically and accurately adjusted when the main rope tension is unbalanced.

As described above, the automatic tension adjusting device for a main rope according to claim 2 of the present invention comprises an oil pump for supplying oil through a solenoid valve into a hydraulic jack for stopping the end of each main rope, and It corresponds to a plurality of pressure sensors that detect the pressure for each hydraulic jack and that the pressures in the plurality of hydraulic jacks become equal when the pressure difference exceeds a reference value based on the output of the plurality of pressure sensors. Since the arithmetic unit for controlling the opening / closing of the solenoid valve and the drive of the oil pump is provided, the main rope tension can be automatically and accurately adjusted when the main rope tension is unbalanced. .
As a result, it is not necessary to adjust the tension in the maintenance work of the elevator, and the productivity can be improved.

In the automatic tension adjusting device for a main rope according to claim 3 of the present invention, as described above, the arithmetic unit obtains an average value based on the outputs of the plurality of pressure sensors, and the average value and the average value are calculated in advance. Since the internal load of the car is judged by comparing the input load value in the car and the judgment data is sent to the control panel, it is not necessary to install the weighing device under the car.

As described above, the automatic tension adjusting device for a main rope according to a fourth aspect of the present invention is an elevator when the pressure difference exceeds a limit value based on the outputs of the plurality of pressure sensors by the arithmetic unit. Since the operation stop command of is sent to the control panel, it is possible to prevent problems with the main rope leading to a major accident.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram showing the configuration of the arithmetic unit according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the arithmetic unit according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an arithmetic unit according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an arithmetic unit according to a third embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the arithmetic unit according to the third embodiment of the present invention.

FIG. 7 is a diagram showing an overall configuration of a conventional elevator.

FIG. 8 is an enlarged view showing a rope stopping portion of a main rope of a conventional elevator in a partial cross section.

[Explanation of symbols]

 1 Machine room 2 Control panel 3 Machine stand 6A Rope stop 8 Hoistway 9, 9a, 9b Main rope 13 Car 20, 20A, 20B Arithmetic device 24 Oil pump 25a, 25b Solenoid valve 26a, 26b Hydraulic jack 27a, 27b Pressure sensor

Claims (4)

[Claims] 1. An oil pump for supplying oil through a solenoid valve into a hydraulic jack for stopping an end portion of a main rope, a pressure detecting means for detecting pressure in the hydraulic jack, and a plurality of pressure detecting means based on outputs of the pressure detecting means. An automatic tension adjusting device for a main rope, comprising: arithmetic means for controlling opening / closing of the solenoid valve and driving of the oil pump so that the tension of the main rope becomes uniform. 2. An oil pump for supplying oil through a solenoid valve into a hydraulic jack for stopping the end of each main rope, a plurality of pressure sensors for detecting the pressure of each hydraulic jack, and a plurality of the pressure sensors. And an arithmetic unit for controlling the opening / closing of the corresponding solenoid valves and the drive of the oil pump so that the pressures in the plurality of hydraulic jacks become equal when the pressure difference exceeds the reference value based on the output. An automatic tension adjustment device for the main rope. 3. The arithmetic unit obtains an average value based on the outputs of the plurality of pressure sensors and compares the average value with a pre-input car internal load value to determine an internal load of the car. The automatic tension adjusting device for the main rope according to claim 2, wherein the determination data is sent to a control panel. 4. The main unit according to claim 2, wherein the arithmetic unit sends an elevator stop command to the control panel when the pressure difference exceeds a limit value based on the outputs of the plurality of pressure sensors. Automatic rope tension adjustment device.