JPH1087210A - Control device for hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of measuring work by performing measurement of rope elongation and measurement of an overstroke during a series of work. SOLUTION: A short-circuit switch, capable of selectively short-circuiting a normally closed contact of an upper limit switch 7 impeding an excessive rise of a car and a normally closed contact of a plunger limit switch 8 preventing excessive protrusion of a plunger, is provided, operating the short- circuit switch 10A, only the normally closed contact of the up limit switch 7 is short-circuited, and rope elongation is measured. Operating the short-circuit switch both the normally closed contacts of the up limit switch 7 and the plunger limit switch 8 are short-circuited, and an overstroke is measured. In this way, shortening of a work time can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator control system, and more particularly to a hydraulic elevator control system suitable for measuring the overstroke of a plunger and the elongation of a rope during maintenance work.

[0002]

2. Description of the Related Art Conventionally, a maintenance work of a hydraulic elevator, in particular, a method of measuring an overstroke from a position where a car floor coincides with a landing floor on the top floor to a time when a lower portion of a plunger abuts on an upper portion of a cylinder has been conventionally used. JP-A-4-2
As described in Japanese Patent No. 17574, a position detection device for outputting an output signal at a position where the floor of the car coincides with the floor of the top floor, and a maintenance switch for switching the elevation of the car to low-speed operation. A short circuit that can be operated by the above, a short circuit that invalidates the operation of the up limit switch and the plunger limit switch, a buzzer that sounds when the short circuit is formed, and an arithmetic circuit that is started when the short circuit is formed, A hydraulic elevator plunger comprising: a calculating device for calculating the number of output pulses of the rotary encoder from when the output signal of the position detecting device is output until the stopper attached to the lowermost portion of the plunger abuts on the uppermost portion of the cylinder and stops. Has been proposed.

[0003]

In the above-described conventional overstroke measuring device, both the up limit switch and the plunger limit switch are simultaneously short-circuited in order to measure the overstroke.
When measuring the operating position of the plunger limit switch to measure the elongation of the rope, it is necessary to short-circuit the up limit switch again, resulting in a problem that the work efficiency is poor.

The present invention has been made in view of such a situation in the prior art, and a first object of the present invention is to provide a hydraulic elevator control device capable of improving the efficiency of measurement work.

Another object of the present invention is to provide a hydraulic elevator control device having an efficient structure.

[0006]

In order to achieve the first object, an invention according to claim 1 of the present invention comprises an up-limit switch for preventing an excessive rise of a car and a plunger for driving the inside of a cylinder. A hydraulic elevator control device comprising: a plunger limit switch for preventing over-projection; and a stop circuit for stopping the ascending operation of the car when one of the up-limit switch and the plunger limit switch operates. And a short-circuit switch capable of selectively short-circuiting the up-limit switch and the plunger limit switch.

According to the first aspect of the present invention, the operator operates the short-circuit switch to short-circuit only the up-limit switch during maintenance work.
In this state, the car is raised and the position at which the car is stopped by the operation of the plunger limit switch is measured to measure the rope elongation. The operator operates the short-circuit switch to short-circuit both the up-limit switch and the plunger limit switch, and in this state, raises the car to measure the overstroke.
As described above, the measurement of the rope elongation and the measurement of the overstroke can be performed in a series of operations, thereby improving the efficiency of the measurement operation.

According to a second aspect of the present invention, there is provided a portable maintenance operation in which the short-circuit switch is connected to an instrument box above the car via a connection line. It has a configuration provided in the device.

According to the second aspect of the present invention constructed as described above, during maintenance work, the operator takes out the operating body connected to the instrument box on the upper part of the car to the landing and short-circuits the switch from the landing. To perform a measurement operation in the same procedure as described above. As described above, by providing the portable maintenance operation device with the short-circuit switch, an efficient structure can be achieved as compared with a case where the short-circuit switch is provided separately.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hydraulic elevator control device according to the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing an embodiment of a control apparatus for a hydraulic elevator according to the present invention, FIG. 2 is an electric circuit diagram of a main part of the control apparatus of FIG. 1, and FIG. 3 is an enlarged view of a main part of the control apparatus of FIG. FIG.

In general, as shown in FIG. 1, the hydraulic elevator is provided with a pulley 3A at the upper end of a plunger 3 which slides in a cylinder 2 erected on a hoistway 1, and a key 3B of a plunger limit switch 8 to be described later. Pulley 3
One end of the rope 4 wound around A is connected to the cylinder 2 and the other end is connected to the car 5. The hoistway 1 has an up-limit switch 7 for preventing the car 5 from rising excessively, and a plunger limit switch 8 for preventing the plunger 3 from projecting excessively.
And is installed. Further, an upper part of the car 5 is provided with an instrument box 9 containing a bar 5A of the up-limit switch 7 and a door control circuit (not shown), and a portable maintenance and operation device 10 is connected to the instrument box 9. It is connected via line 11. Further, an operation panel 5B is provided in the car 5, and below the operation panel 5B, which is normally locked, is a maintenance switch 12A and a stop operation switch 12B which are operated during maintenance work. A board 12 is provided. Then, the above-described up limit switch 7, plunger limit switch 8,
The operation panel 5B, the appliance box 9 and the operation panel 12 are connected to the hydraulic control unit 6 via the lead wires 14, respectively. In addition, F is a landing.

As shown in FIG. 3, the control device for a hydraulic elevator according to the present embodiment includes a normally closed contact 7b which is opened when the up-limit switch 7 comes into contact with the bar 5A, as shown in FIG. And a normally-closed contact 8b which is opened when the plunger limit switch 8 contacts the key 3B.
0B is provided.

As shown in FIG. 2, the hydraulic elevator has a normally closed contact 7b of an up limit switch 7 having one end connected to a power source P and a normally closed contact 7b of a plunger limit switch 8 having one end connected to a normally closed contact 7b. A closing contact 8b, one end of which is connected to a normally closed contact 8b, and the other end of which is connected to a power source N.
3 and a maintenance operation command relay 1 having one end connected to the power supply P
A normally open contact 11a, one end of which is a normally open contact 11a, the other end of which is connected between a normally closed contact 7b and a normally closed contact 8b, a short circuit switch 10A, one end of which is a normally open contact 11a, and the other end of which is normally connected. A short-circuit switch 10B connected between the closed contact 8b and the ascending operation stop relay 13, a maintenance switch 12A having one end connected to the power supply P, a maintenance switch 12A having one end connected to the power supply N, and a maintenance switch having one end connected to the power supply N. An electric circuit including the operation command relay 11 is provided.

In this embodiment, first, one worker gets into the car 5 on the top floor, opens the operation panel 12 with a key (not shown), turns on the maintenance switch 12A, and turns on the car 5 The portable maintenance and operation device 10 housed in the upper part is taken out, goes out to the hall F, and operates the short-circuit switch 10A. As a result, a circuit of power supply P-maintenance switch 12A-maintenance operation command relay 11-power supply N is formed, maintenance operation command relay 11 is energized, and power supply P-normally open contact 11a
A short-circuit switch 10A, a normally closed contact 8b, a rising operation stop relay 13, and a power supply N circuit are formed. In this state, when the worker performs the low-speed ascent operation of the car 5 at the landing F, the car 5 is raised, and the key 5A is moved up by the up-limit switch 7.
To open the normally closed contact 7b. After this, the car 5 continues to rise, the key 3B contacts the plunger limit switch 8, the normally closed contact 8b is opened, and the power supply P-normally open contact 11a-short-circuit switch 10A-normally closed contact 8b-rising operation The circuit of the stop relay 13 and the power supply N is opened, and the car 5 stops when the ascending operation stop relay 13 is deenergized.

Here, the worker measures the distance between the floor of the car 5 and the floor of the top floor, and measures the elongation of the rope 4 by comparing it with a predetermined numerical value.

Next, when the short-circuit switch 10B is turned on, a circuit of the power supply P, the normally open contact 11a, the short-circuit switch 10B, the rising operation stop relay 13 and the power supply N is formed, and the normally closed contacts 7b and 8b are short-circuited, respectively. When the car 5 is driven at low speed in this state, the car 5 continues to rise until the lower part of the plunger 3 is locked to the upper part of the cylinder 2, and when the car 5 is stopped, Car 5
The distance between the first floor and the floor of the top floor is measured, and the overstroke of the plunger 3 is measured.

Thereafter, the operator performs a low-speed descent operation to lower the car 5, returns the short-circuit switches 10A and 10B, and returns the maintenance switch 12A to complete the operation.

In the embodiment configured as described above, the operator can measure the elongation of the rope and the overstroke in a series of operations, thereby improving the efficiency of the measurement operation. it can. Further, by providing the portable maintenance and driving device 10 with the short-circuit switches 10A and 10B, an efficient structure can be achieved as compared with a case where the short-circuit switches 10A and 10B are separately provided.

In this embodiment, the short-circuit switch 10
A and 10B have been described in the case where the portable maintenance and operation device 10 is provided. However, the present invention is not limited to this. For example, a short-circuit switch may be separately installed in the landing on the top floor.

[0021]

According to the first aspect of the present invention, the efficiency of the operation of measuring the rope elongation and the overstroke can be improved, thereby shortening the operation time. Can be.

Further, since the invention according to the second aspect of the present invention is configured as described above, it is possible to make the structure more efficient as compared with the case where the short-circuit switch is provided separately, and thereby the cost is reduced. Can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of a control device for a hydraulic elevator according to the present invention.

FIG. 2 is a main part electric circuit diagram of the control device of FIG. 1;

FIG. 3 is an enlarged view of a main part of the control device of FIG. 1;

[Explanation of symbols]

 Reference Signs List 2 Cylinder 3 Plunger 3B Slasher 5 Car 5A Slasher 7 Up limit switch 7b Normally closed contact 8 Plunger limit switch 8b Normally closed contact 9 Instrument box 10 Portable maintenance and operation device 10A, 10B Short circuit switch 11 Connection line 12 Maintenance switch

Claims (2)

[Claims] 1. An up-limit switch for preventing an excessive rise of a car, a plunger limit switch for preventing an over-projection of a plunger for driving the inside of a cylinder, and one of the up-limit switch and the plunger limit switch is provided. A control circuit for a hydraulic elevator including a stop circuit for stopping the ascending operation of the car when operated, wherein a short-circuit switch capable of selectively short-circuiting the up-limit switch and the plunger limit switch is provided. Characteristic elevator elevator control device. 2. The control device for a hydraulic elevator according to claim 2, wherein the short-circuit switch is provided in a portable maintenance and operation device connected to a tool box above the car via a connection line. .