JPS60197589A - Monitor device for variable load of crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a variable load monitoring device for a towing lane, particularly for use in lifting or lowering reactor internals within a nuclear reactor vessel. The present invention relates to a device suitable for monitoring load variations in l=-rough lanes.

In the conventional device of this kind, as shown in FIG.
A load cell (O
l) is connected to the indicator (03) via the connection cable (02), the hanging load detected by the load cell (01) is displayed on the indicator (03), and this indicator (03) Although load fluctuations were monitored, there were five problems: the responsiveness and analysis of load fluctuations were poor, and interference between suspended loads and surrounding structures could not be clearly detected. In addition,(
04) is a constant voltage device that supplies a constant voltage current to the load cell (01) and indicator (02).

The present invention was invented in order to deal with the above-mentioned problems, and its purpose is to provide a monitoring device that can obtain clear variable load values and that can immediately evaluate variable load values. It is something to do.

Hereinafter, one embodiment of the present invention will be specifically described with reference to FIGS. 2 and 3.

In Figure 2, (1) is a load cell, (2) is an indicator, (3) is a constant voltage device, (4) is a monitoring device, (5) is a recorder, and (6) is an alarm device such as a buzzer. be. The output of the load cell (1) is sent to the monitoring device (4) via the cable (7).
and the output of the monitoring device (4) is connected to the cable (8) (
9) Indicator (2), recorder (5),
Each is input to the alarm device (6). Constant voltage device (3
) is passed through the wires (11) and (12) to the indicator (
2), is supplied to the monitoring device (4). (13) is an electric wire that supplies current from the monitoring device (4) to the recorder (5). (4-1) is a monitoring mode selection switch, (4-2) is a warning lamp, and (4-3) is a lamp that displays the calculated variable load value. The following three modes can be selected by switching the monitoring mode selection switch (4-way).

Mode I: The hanging load detected at the same time as the start of the monitoring operation is stored as a reference value, and thereafter this reference value and the detected hanging load are compared to determine whether the difference is within the set range. If the setting range is exceeded, an alarm signal is output.

Mode I: When the suspended load is affected by buoyancy, etc., and the detected suspended load changes, this load is updated and stored as a reference value, and the load change due to buoyancy and the load change due to interference of the suspended load are distinguish between

Thereafter, as in Mode I, this updated reference value is compared with the detected hanging load to determine whether this difference is within the set range, and if the difference exceeds the set range, an alarm signal is output. do.

Mode ■: When operating the crane, inching operation is performed when there is a high risk of interference with the suspended load, but in this case, the suspended load vibrates and the detected load fluctuates, which may be mistaken for interference with the suspended load. Therefore, while performing inverter operation, find the average value of the detected load and compare it with the standard value of motor control or mode ■ to determine whether this difference is within the set range or not, as in mode I or mode I. , an alarm signal will be issued if the setting range is exceeded.

The alarm signal is verified whether it is a false recognition or not by the following method. Regarding the false alarm signal pattern as shown in FIG. 6(α), this is compared with the pattern diagram as shown in FIG. 6(5), and the hatched portion is inputted as +1 and the other portions as zero. Several false alarm signal patterns are also input in the same way, and a false alarm matrix is constructed based on these. Next, when the alarm signal shown in Figure 6(c) is transmitted, the data 1 second before and 0.5 seconds after that are shown in Figure 3(d) in the same manner as above.
Create a data vector by matching it with the pattern diagram as shown in . A misidentification verification vector is obtained by multiplying this vector with the previously obtained pattern normal matrix. Then, this misidentification verification vector is compared with the closest misidentified vector, and if there is a similarity of 80 or more, it is determined that there is a misidentification, and the alarm lamp (4-2) and alarm device (6) are activated. Reset automatically.

Although the embodiments have been described in detail above, the present invention includes a means for detecting fluctuations in the hanging load of a crane, an alarm device, a monitoring device having a reference value calculation function, a comparison alarm function, and a false recognition verification function. Since it is equipped with the following functions, a clear variable load value can be obtained, and since the variable load value can be evaluated immediately, it is possible to monitor the interference of suspended loads with more precision.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a conventional crane variable load monitoring device, Fig. 2 is an explanatory diagram showing an embodiment of the present invention, and Fig. 6 is an explanatory diagram showing a graphic processing procedure in the same. . Means for detecting load fluctuations...1, Alarm device...4
-2.6, Monitoring device...4 30th Kg

Claims (1)

[Claims] 1. A variable load monitoring device for a crane, comprising means for detecting changes in a crane's suspended load, an alarm device, and a monitoring device having a standard calculation function, a comparison report function, and a false recognition verification function.