JPH0536350B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an elevator governor test device, and particularly to an improvement of a drive device for a rope sheave of the governor.

[Prior Art] Elevator speed governors are required to undergo an operational test after completion of installation, and the rope that drives the speed governor's rope sheave is The running speed of the car when the rope is sandwiched between the rope sheave and the rope sheave to operate the limit switch and emergency stop device that electrically interrupt the elevator control circuit by rotating the rope sheave with the speed governor alone. The speed corresponding to is measured by pressing a speedometer against a speed measurement groove carved in the rope sheave.

Figure 4 shows a conventional drive device for rotating the rope sheave of the speed governor when performing this type of operation test. In the figure, 1 is the rope sheave of the speed governor, and 2 is the rope sheave driving roller. in,
It has a truncated conical shape that gradually tapers toward the tip. Reference numeral 3 denotes an electric drill having a function in which the rotation speed can be adjusted by controlling a lever 4 which also serves as a switch.

A conventional elevator speed governor testing device is constructed as described above, and is performed by pressing the rope drive roller 2 at an appropriate diameter position against the rope sheave 1 in accordance with the governor's rated signal, and gradually pulling the lever 4. The rotational speed of the electric drill 3 is increased little by little, and the speed corresponding to the car speed when the above-mentioned control circuit interrupting limit switch and emergency stop device operate is measured.

[Problems to be Solved by the Invention] In the conventional elevator governor testing device as described above, the pressing position of the rope sheave driving roller 2 against the rope sheave 1 and the amount of operation of the lever 4 of the electric drill 3 are Since the method relies on the experience of the operator, there is a problem in that the rotational speed around the operating point is not constant, and the measured value changes each time the test is performed.

Additionally, when testing governors with low rated speeds, the operating point of the governor was reached with just a slight movement of the lever on the electric drill, making measurements extremely difficult.

This invention was made in order to solve this problem, and it is possible to achieve the optimum condition for the operation test of the speed governor to be measured and to always obtain the same measured value even if the operation test is performed multiple times. Another object of the present invention is to provide a testing device for an elevator speed governor that can accurately test the operation of a speed governor with a low rated speed without requiring any skill.

[Means for Solving the Problems] The elevator governor test device according to the present invention stores a plurality of types of preset motor rotation speed change pattern data in accordance with the rated speeds of various governors. At the same time, select the rotation speed change pattern data that matches the rated speed of the speed governor to be measured from among these, and control the rotation of the motor in proportion to this pattern data. Upon detection, the power to the motor is cut off.

[Function] In the present invention, since the electric motor is automatically controlled to drive the rope sheave at a rotational speed commensurate with the rated speed of the governor, the optimum state for the operation test of the governor to be measured can be achieved. Furthermore, since the power to the electric motor is cut off upon detection of the car emergency stop operation, the electric motor is stopped in accordance with the restrained state of the rope sheave, and damage to the drive rollers is prevented.

[Embodiment] FIGS. 1 to 3 show an embodiment of the present invention, and in the figures, the same reference numerals as in FIG. 4 indicate the same or corresponding parts. 5 is the governor body, 6 is the rope sheave 1
This is a small electric motor that drives the rope sheave drive roller 2 that is pressed into contact with the rope sheave, and outputs a feedback signal that is proportional to its rotation speed. Reference numeral 7 denotes a mounting bracket for the electric motor 6, and 7A denotes a large magnet attached to the mounting bracket 7, which fixes the electric motor 6 to the governor by being magnetically attached to the governor main body 5. Reference numeral 8 denotes a control device for the electric motor 6, which has a circuit configuration shown in FIG. 9 is a speed setting device for specifying the rated speed of the speed governor to be measured, and 10 is a start button of the control device 8.

In Fig. 1, 11 and 12 are the bus bars of the AC power supply, 13 is the DC power supply, and Vcc is the + of the logic circuit.
Power bus, Vc ⁺ is the analog circuit + power bus,
Vc- is a similar power supply bus, 10a is a normally open contact of the start button 10, 14 is a motor drive relay,
14a, 14b, 14c are normally open contacts, 14d
1 is its transfer contact; 15 is a normally closed contact of a well-known limit switch that detects that the governor has operated to pinch the rope in the rope sheave 1;
6 is a flip-flop, 17 is an inverter, 18
is a NAND gate, 19 is a D flip-flop,
20 is an oscillator, 21 is a read-only memory that stores a plurality of types of rotational speed change pattern data of the electric motor 6 according to the rated speeds of various speed governors, and 22 is a presettable counter, the binary output of which is read-only. It has the number of bits that can access the data storage area of the memory 21. 23 is a D/A converter; 24 is a current-voltage conversion circuit;
Converts the current output of converter 23 into a voltage signal. 25 is a power control unit that is combined with the electric motor 6 and controls the motor 6 to a rotation speed proportional to the input voltage; 26 is a feedback signal circuit that connects the electric motor 6 and the power control unit 25; 27 is a capacitor; 28 to 32 33 is a binary code output of the speed setting device 9; 34 is a multiplexer; 33 is a binary code output of the speed setting device 9; Each unit 28 corresponds to the binary code output of
A specific output signal is selected from among the 32 output signals, and the selected output signal is input to the preset data input terminal of the presettable counter 22. 35 to 37 are resistors, 38 are capacitors,
39 is a diode.

In the elevator governor testing apparatus configured as described above, first, the electric motor 6 is attached to the governor body 5 by the magnetic force of the large magnet 7A, and the rope sheave driving roller 2 is brought into pressure contact with the rope sheave 1. The electric motor 6, limit switch contacts 15, and AC power source are connected to the control device 8 as shown in FIG.

Next, adjust to the rated speed of the governor to be measured,
The speed setting device 9 of the control device 8 is set. Then, the output signal 33 causes the multiplexer 34 to
selects a corresponding address signal from each of the units 28 to 32 and outputs it to the preset data input terminal of the presettable counter 22.

Next, with the sensor head of a speed measuring device (not shown) pressed against the rope sheave 1, the start button 10 of the control device 8 is pressed. Then, the normally open contact 10a closes, the Vcc-10a-14-ground circuit is self-maintained, and the normally open contacts 14b, 1
By closing 4c, the electric motor 6 is connected to the power control unit 32. Further, since the normally closed side of the transfer contact 14d is opened and the normally open side is closed, the output of the flip-flop 16 changes from the "L" level to the "H" level. Therefore, the reset terminal of the presettable counter 22 connected thereto also goes to the "H" level, making it possible to count pulses.

In addition, an inverter 17, a NAND gate 18,
An up edge detection circuit consisting of a resistor 37 and a capacitor 38 operates, and the NAND
The output of gate 18 is set to "L" level. As a result, the preset terminal of the presettable counter 22 becomes "L" level, and the multiplexer 34
The leading address of the storage area for the optimal rotational speed change pattern data output from the presettable counter 22 is set in the presettable counter 22, and preparation is made to count sequentially from this address.

After the time determined by the time constant of the resistor 37 and capacitor 38 has elapsed, the output of the NAND gate 18 becomes “H”.
When it returns to the level, the output of the D flip-flop 19 changes from "L" to "H" level, and the reset terminal of the oscillator 20 connected to it becomes "H" level, the reset is released and the oscillator 20 returns to the preset level. It starts transmitting and outputs pulses at the specified period. This pulse is sent to the presettable counter 22.
The read-only memory 2 counts the binary code that increases by 1 from the address set first.
1 as address data.

The read-only memory 21 sequentially outputs the rotation speed change pattern data stored at the address, and this data is converted into a voltage signal by the D/A converter 23 and the current-voltage conversion circuit 24, and then sent to the power control unit 25. change the input terminal voltage of Since the power control unit 25 controls the rotation of the electric motor 6 in proportion to the input terminal voltage, the rotation speed of the rope sheave 1 also changes in accordance with the rotation of the electric motor 6.

The rotation of the rope sheave 1 of the speed governor increases in proportion to the set pattern data, and the limit switch that detects that the speed governor has pressed the rope against the rope sheave 1 operates, and the limit switch is opened normally. When contact 15 opens, motor drive relay 14
is deenergized and its normally open contacts 14a, 14b, 14
c is opened and the electric motor 6 is cut off from the power control unit 25. As a result, even if the rope sheave 1 is restrained, the electric motor 6 is not driven and stops in accordance with the movement of the rope sheave 1.
The rope sheave driving roller 2 will not be damaged.

Further, when the normally open side of the transfer contact 14d of the motor drive relay 14 is opened and the normally closed side is closed, the output of the flip-flop 16 becomes "H".
The level changes to "L", and the presettable counter 22 and the D flip-flop 19 are reset. Then, by resetting the D flip-flop 19, its output changes from "H" to "L" level, and the reset terminal of the oscillator 20 goes "L".
The level changes and oscillation stops, entering a standby state for the next measurement.

Therefore, the speed governor turns off the limit switch that electrically shuts off the elevator control circuit at the rated speed.
You can easily read the value of the speed measuring device when the speed governor operates at 130% or less and when the governor operates the action of pushing the rope against rope sheave 1 at 140% or less of the rated speed. The rotation of the electric motor 6 is automatically controlled so that
Operation tests can be performed accurately and easily, and no skill is required for the work.

[Effects of the Invention] As explained above, the present invention stores a plurality of types of preset motor revolution speed change pattern data in accordance with the rated speeds of various speed governors, and selects the speed governor to be measured from among the data. The rotational speed change pattern data corresponding to the rated speed of the machine is selected, and the rotation of the motor is controlled in proportion to this pattern data, while the car emergency stop operation of the speed governor is detected.
Since the power to the motor is cut off, the optimum conditions for the operation test of the governor being measured are achieved, and even if the operation test is performed multiple times, the same measurement value can be easily obtained, and the rated value can be easily obtained. It has the advantage that even a low-speed governor can be tested accurately without requiring any skill.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a control device showing an elevator governor test device according to an embodiment of the present invention, and FIG.
The figure is an installation diagram showing the rope sheave drive device of the above test equipment, FIG. 3 is an external view of the control device shown in FIG. 1, and FIG. 4 is an explanatory diagram showing the rope sheave drive device in the conventional elevator governor test equipment. It is. 1... Rope sheave, 2... Rope sheave driving roller, 6... Electric motor, 7... Mounting bracket, 7A
... Large magnet, 8 ... Control device, 9 ... Speed setting device, 14 ... Motor drive relay, 21 ...
...Read-only memory, 24...Current-voltage conversion circuit, 25...Power control unit, 34
...Multiplexer. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An electric motor detachably attached to a speed governor to be measured of an elevator, a drive roller connected to the motor and pressed against a rope sheave of the speed governor to be measured to rotate the rope sheave, and a control device for the electric motor. , the control device includes a storage unit that stores a plurality of types of preset rotational speed change pattern data of the motor according to the rated speeds of various speed governors, and inputs the rated speed of the speed governor to be measured.
a selection unit that retrieves rotational speed change pattern data of the electric motor corresponding to this from the storage unit; a control unit that controls the rotation of the electric motor in proportion to the selected rotational speed change pattern data of the electric motor; 1. A testing device for an elevator speed governor, comprising: a detection section that detects a car emergency stop operation; and a cutoff section that cuts off power to the electric motor in response to an operation detection signal from the detection section.