JPH01162691A - Load detector for elevator - Google Patents

Abstract

PURPOSE: To previously prevent a shut-in by arranging a means for detecting an abnormal state of a load detecting device in an elevator control device for reducing a torque shock at starting time by generating torque corresponding to a load. CONSTITUTION: An elevator control device 24 reduces a torque shock at starting time by generating torque corresponding to a load by inputting a load signal from a load detecting device 22 arranged under a landing car 21. In this case, the control device 24 does not generate a departure permitting signal of an elevator by judging it as abnormal at exceeding time by checking whether or not this value exceeds a prescribed range by a microcomputer by converting a value detected in an analog quantity as a load signal into a digital value to thus previously prevent a shut-in or uncomfortableness to ride in by a starting shock.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an elevator control device, and particularly to a load detection device for detecting the load inside a car.

[Conventional technology]

In order to improve the ride comfort when starting the elevator, that is, to reduce the starting shock, a scale device is installed under the car to detect the load inside the car, and from this information, a compensation torque at starting commensurate with the load is calculated. The method of calculating and starting a car from an electric motor via a rope is well known. (Japanese Unexamined Patent Publication No. 52-149743) [Problems to be Solved by the Invention] In the above-mentioned prior art, the validity of the detected load value is not checked at all. Therefore, for example, when ascending from the lowest floor with a full car, a large moving torque is required, but if there is a break in the load detection signal line, a sufficiently large force is required to treat the car as being unloaded. No forwarding torque is output, and as a result, a large reversal phenomenon occurs during start-up, which may cause the final limit switch to operate and cause a canning accident, trapping passengers inside the car.

The purpose of the present invention is to check the validity of the load detection value, and if there is an abnormality, the elevator will not start, thereby preventing secondary problems caused by the load detection abnormality (comfortable ride at startup, 2 canning accidents). The goal is to prevent this from happening.

[Means for solving problems]

The purpose of the above is to digitally convert the value detected as an analog quantity as a load signal from the ear device installed under the car, and to use a microcomputer to check whether this value deviates from a predetermined range. This is achieved by determining that there is an abnormality and not issuing a departure permission signal to the elevator.

[Effect]

FIG. 2 shows the structure of the elevator. 21 is the car, 2
2 is an ear device installed under the car.

Reference numeral 23 denotes a moving cable, which is used for transmitting power supply and load detection signals for driving the ear device. 24 is a control device installed in the machine room.

5-1.5-2 in FIG. 3 is an A/D converter that converts the analog signal from the ear device 2-1.2-2 into a digital signal, and this digital value is input to the microcomputer.

FIG. 4 shows the relationship between the AC output voltage and displacement of the ear device.

FIG. 5 shows the relationship between the car load and the detected digital signal, and the replacement process is as follows. That is, in Fig. 4, if the digital conversion values corresponding to points A and B corresponding to the in-car focal load are X65υG10°X65VG20, then the bias amount corresponding to the difference between the two is l65WGB.
1 becomes l65WGB1=X6511G10-X65WG20. When the car inner metal load is 100%, the arbitrary load % display V65RG1 is as follows: V65RG1 = l65WGG1 * (X651i
1G2- X6FMG] +l65WGB1) Here, l65WGG1 represents the gain, and
X65IIIG100 + l65WGB1.

These are the digital conversion values corresponding to points C and D in Figure 4 when X65WG100 and X65WG200 are loaded.

As shown in FIG. 5, the digital conversion value V65RG1 proportional to the car load can be obtained.

〔Example〕

An embodiment of the present invention will be explained with reference to FIG. This figure expresses the program procedure of period T. First, in step 1, reset the register D5, and in step 2, set the load detection value ADI.
is stored in register D1.

3, when Dl is less than the predetermined value $FFF, 1 is set in bit 1 of register D5. In step 4, the load detection value AD2 is stored in the register D2. 5, when D2 is greater than or equal to $FFF, 1 is set in bit 2 of register D5. When D570 is detected in step 6, the abnormal value detection counter TV65WC is incremented. Also, when D5≦0, the detected value is
and stored in X65111G2 and reset TV65WC. In step 7, the car load is calculated as a ratio when the full load weight is 100%, and is stored in V65RGl. T at 8
If the counter value of V65WC is equal to or greater than a predetermined value, 1 is set in the 15th bit and the O bit of the detection error flag TV65RG. 9 and 10, if the digital conversion value is less than a predetermined value, bit 15. Bit 1. Pip 1~
Add 1 to 2.

11, if the detected value V65RG1 is less than 130%, it is regarded as abnormal, and the bit shown in the figure is set to 1. 12°13
Now reset the detected value. This procedure is repeated for T periods.

According to this embodiment, when the digital conversion value of the car load deviates from a predetermined range, the TV65RG is notified as an abnormality.
! Based on this information, a departure permission signal is not issued to the elevator and the stopped state is maintained.

〔Effect of the invention〕

According to the present invention, when an abnormality occurs in the load detection device due to a break in the moving cable or a failure in the A/D converter, the elevator will not run, thereby preventing problems such as failure or poor ride quality due to startup shock. It can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the program procedure of period T in one embodiment of the present invention, Fig. 2 is an explanatory diagram of the structure of the elevator, Fig. 3 is a system diagram of the load detection device, and Fig. 4 is the AC of the lower scale device. The output characteristic diagram, FIG. 5, is a diagram showing the digital conversion value of the car internal load. Agent Patent Attorney Muscle Ogawa' 1st Cause A Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In an elevator control device that detects the load inside the car using a weighing device under the car, generates torque commensurate with the load, and reduces torque shock at startup, the load detection device is in an abnormal state. An elevator load detection device characterized by comprising means for detecting. 2. The elevator load detection device according to claim 1, which operates when the detected load value deviates from a predetermined range.