JP2009091124A - Load detector of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a load detector of an elevator having an appropriate value in the amount of the displacement of a differential transformer with respect to a load in a car, and having high detection accuracy. <P>SOLUTION: This load detector of an elevator 30 detecting the value of a load in a car chamber 22 based on the amount of the displacement of the car chamber 22 with respect to a car frame 25 is provided with: a turnable lever member 43 having one end connected to the bottom of the car chamber 20, and having a plurality of grooves 43a, 43b and 43c at other ends; and the differential transformer 32 having a rod 32a abutting on one of the grooves 43a, 43b and 43c, and generating a voltage based on the movement by moving the rod 32a by rotating the lever member 43 based on the amount of displacement of the car chamber 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an elevator load detection device.

As described in Patent Document 1 below, a conventional elevator load detection device is an elevator load detection device that detects the magnitude of a load in a car room based on the amount of displacement of the car room with respect to the car frame. A flat adapter that can be mounted by sliding horizontally on the beam, a mounting bracket that can fix the base end to an arbitrary position on the adapter, and a distal end portion of the mounting bracket. Some have a differential transformer for displacement detection interposed between the cab and the cab.

According to such a load detection device, the base end of the mounting bracket in a state where the differential transformer main body or the differential transformer core is mounted is fixed to an arbitrary position of the flat adapter whose position is adjusted by sliding in the horizontal direction in advance. be able to.
For this reason, the installation position of the differential transformer is changed depending on each elevator specification, and the relative displacement between the mounting bracket and the lower beam caused by the change is covered by the presence of the adapter. Therefore, the mounting bracket itself may be of a single type manufactured to the specified dimensions, and such a mounting bracket can be fastened to the lower beam without any trouble, so that the differential transformer is eventually mounted at an arbitrary position under the car floor. It becomes possible.

JP-A-8-245109

However, as shown in FIG. 4 depending on the load of the elevator, the size of the car frame, etc., the displacement amount of the rod of the differential transformer changes as shown in the curves T1 to T3 with respect to the load in the car. When the amount of displacement of the rod of the differential transformer is small with respect to the change in the car load as in T1, there is a problem that the detection accuracy of the car load decreases.

The present invention has been made in order to solve the above-described problems, and an elevator load detection device having high detection accuracy when the displacement amount of the rod of the differential transformer becomes an appropriate value with respect to the load in the car. The purpose is to provide.

An elevator load detection device according to a first aspect of the present invention is an elevator load detection device for detecting the magnitude of a load in a car room based on the amount of displacement of the car room with respect to the car frame, wherein one end is located at the bottom of the car room. A pivotable lever member that is connected and has a plurality of grooves at the other end, and a rod abutting on one of the grooves and rotating the lever member based on the amount of displacement. And a differential transformer that generates a voltage based on the movement of the rod.

The elevator load detection device according to the second aspect of the invention preferably includes a connecting member in which the cab is connected to one end and the other end is rotatable to one end of the lever member.
Thereby, since the displacement amount of a cage can be transmitted to the one end part of an insulator member via a connection member, the rod of a differential transformer can be moved via an insulator member with a simple structure.

ADVANTAGE OF THE INVENTION According to this invention, the load detection apparatus of an elevator with high detection accuracy can be obtained because the displacement amount of a differential transformer becomes an appropriate value with respect to the load in a car.

Embodiment 1 FIG.
An embodiment of the present invention will be described with reference to FIGS. 1 is an overall view of an elevator showing an embodiment of the present invention, FIG. 2 is a side view showing a car and a load detection device according to FIG. 1, and FIG. 3 is an electric circuit diagram of the load detection device for an elevator according to FIG. .
In FIG. 1, an elevator is configured such that a motor 7 is driven from a commercial three-phase AC power source 3 via an elevator drive unit 5, and the motor 7 rotationally drives a sheave 9 of the hoisting machine. A rope 11 is hung on the groove 9, a counterweight 13 is fixed to one end of the rope 11, and a car 20 is fixed to the other end.
The car 20 has a load detection device 30 that detects the magnitude of the load and generates a load detection signal, and the elevator drive unit 5 is controlled by an elevator control unit 70 to which the load detection signal is input. .

In FIG. 2, the car 20 includes a car floor 24, a car room 22 on which a person rides, and one end fixed to the car floor 24, and the other end fixed to the top 25 a of the car frame 25. The car frame 25 has horseshoe-shaped springs 27, 27.
And it has the load detection apparatus 30 which detects the magnitude | size of the load in the cage 22 based on the displacement amount of the cage 22 with respect to the cage 25.

The load detection device 30 is fixed to a mounting plate 34 fixed to the car frame 25, a columnar differential transformer 32 having a rod 32a, and a detection plate 35 fixed to the top portion 25a of the car frame 25. And an insulator 40 for enlarging / reducing the displacement of the detection plate 35 and transmitting it to the rod 32a of the differential transformer 32.
The mounting plate 34 is formed to be slidable in the left-right direction in FIG. 2 by being fixed using a long hole provided in the car frame 25.
The differential transformer 32 has a rod 32a that moves up and down based on the displacement amount, and the rod 32a is formed so as to push out the rod 32a by a compression spring 32b.

The lever portion 40 includes a connecting member 41 whose one end surface is in contact with the detection plate 35, a connecting member 41 on the other end portion and a lever member 43 in which one end portion is rotatable, and the lever member 43 in the recess. The lever member 43 is inserted into the lever frame 43 and is provided with a concave member 47 fixed to the car frame 25. The lever member 43 has a U-shaped first groove 43a, a second groove 43b, Three grooves 43c are provided, and the fixing position of the mounting plate 34 is adjusted so that any one of the grooves 43a to 43c comes into contact with the rod 32a of the differential transformer 32 so that the lever ratio can be changed. Has been.
The connecting member 41 is moved downward by the amount of displacement of the cab 22 in the direction of arrow A, and the lever member 43 is also rotated while moving, so that the other end of the lever member 43 is larger than the amount of displacement of the arrow A. It is formed so as to obtain a displacement amount in the direction of arrow B.
The connecting member 41 and the lever member 43 are formed to be rotatable by the first pin 45, and the lever member 43 is formed to be rotatable by the second pin 48.

In FIG. 3, the load detecting device 30 applies an AC power source e to the primary winding 32p of the differential transformer 32 and rectifies the voltages generated from the secondary winding 32s and the tertiary winding 32m via the rod 32a. A first rectifier circuit 51 and a second rectifier circuit 52 are provided, and outputs of the first rectifier circuit 51 and the second rectifier circuit 52 are connected to generate a load detection signal from the amplifier circuit 57 via the bias circuit 55. It is formed to do.

The operation of the elevator load detection apparatus configured as described above will be described with reference to FIGS.
Now, as shown in FIG. 2, the rod 32 a of the differential transformer 32 is brought into contact with the second groove 43 b of the lever member 43 based on the specification of the car room 22. When a person gets into the cab 22, when the cab 22 is displaced in the direction of arrow A in accordance with the load, the connecting member 41 moves in the direction of arrow A, and accordingly, the lever member 43 is rotated around the pin 48. The other end of the lever member 43 moves in the direction of arrow B by rotating in the direction. Then, the rod 32a of the differential transformer 32 is contracted, and as shown in FIG. 3, a voltage is generated from the secondary winding 32s and the tertiary winding 32m of the differential transformer 32, and this voltage is generated by the first rectifier circuit 51, the second The load is rectified by the rectifier circuit 52 and a load detection signal corresponding to the amount of displacement of the car room 22 is generated from the amplifier circuit 57 via the bias circuit 55.
Thereby, as shown in FIG. 4, a displacement amount curve T <b> 2 of the load 32 in the car of the load detection device 30 and the rod 32 a of the differential transformer 32 can be obtained.

The elevator load detection device 30 according to the embodiment described above is an elevator load detection device 30 that detects the magnitude of the load in the car room 22 based on the amount of displacement of the car room 22 with respect to the car frame 25. 20 and a rotatable lever member 43 having a plurality of grooves 43a, 43b, 43c at the other end, a rod 32a abutting against one of the grooves 43a, 43b, 43c, and a car A differential transformer 32 that generates a voltage based on the movement of the rod 32a by rotating the lever member 43 based on the displacement amount of the chamber 22 is provided.

As a result, the lever member 43 is rotated based on the displacement amount of the cab 22 to move the rod 32a of the differential transformer 32, and a load detection signal corresponding to the displacement amount is generated. Thereby, the characteristic of the displacement amount of the cage 22 and the displacement amount of the rod 32a of the differential transformer 32 can be appropriately selected.

The elevator load detection device 30 according to the above-described embodiment preferably includes a connecting member 41 having one end connected to the cab 22 and the other end pivotable to one end of the lever member 43.
Thereby, since the displacement amount of the cage | basket | chamber 22 can be transmitted to the one end part of the lever member 43 via the connection member 41, the rod 32a of the differential transformer 32 can be moved via the lever member 43 with a simple configuration.

  The present invention can be applied to an elevator load detection device.

1 is an overall view of an elevator showing an embodiment of the present invention. It is a side view which shows the cage | basket | car and load detection apparatus by FIG. It is the load detection apparatus and electric circuit diagram of the elevator by FIG. It is a curve figure which shows the displacement amount of the rod of the load of the cage | basket | car of the conventional load detector of an elevator with respect to the rod of a differential transformer.

Explanation of symbols

  22 Car compartment, 25 Car frame 25, 30 Load detection device, 32 Differential transformer, 32a Rod, 41 Connecting member, 43 Insulator member, Grooves 43a, 43b, 43c.

Claims (2)

In an elevator load detection device for detecting the magnitude of a load in the car room based on a displacement amount of the car room with respect to a car frame,
A pivotable lever member having one end connected to the bottom of the cab and a plurality of grooves on the other end;
A differential transformer that abuts the rod in one of the grooves and moves the rod by rotating the lever member based on the displacement and generates a voltage based on the movement;
An elevator load detection device comprising: A connecting member in which one end portion is connected to the cage and the other end portion is rotatable to the one end portion of the lever member.
The elevator load detection device according to claim 1, further comprising:

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