JPH0284088A - Crane brake operation control method - 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] [Industrial Field of Application] The present invention provides brake operation IIN! for a crane that controls brake operation in response to an operation command (forward rotation or reverse rotation). This relates to one method.

[Conventional technology]

In this type of crane brake operation control method,
The brake operation instruction No. 18 is generated in accordance with the driving command to control the operation of the brake device.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, there are malfunctions such as brake M# not being applied even if a brake release instruction signal is sent in response to a driving command, or brake activation not being performed even if a brake activation instruction signal is sent at the time of stopping. There was a problem that caused this.

An object of the present invention is to ensure safety measures against malfunction of the brake device described above.

[Means to solve the problem]

The present invention sends a brake operation instruction signal by comparing the inverter output current value (motor load 1! block value) with a set value after a forward or reverse operation command, and then brakes at a predetermined time delay. Outputs brake abnormal output when there is no change in response input.

〔Example〕

The following description will be made based on the embodiments shown in the drawings.

Referring to FIG. 1, it is assumed that a driving command (forward rotation or reverse rotation) is issued between ts and te. Inverter output current (motor load 1X current) (°) becomes the second stage waveform and rises with a time delay. If the current 1st shift is set to 1M (fM),
It is at the timing of tl that the brake operation instruction output sending level (2% of constant taif1) is reached, and from t1 to ts
resulting in a time difference.

When the brake device operates and opens the brake based on the brake operation instruction output (generation of a brake release signal), a brake response input occurs at the timing ts. Normally, as shown in FIG. 1, the brake release response input generation timing t2 exists within the maximum brake release delay time T1.

With respect to the brake response input, the output frequency increases with a time delay of frequency increase delay time To (inverter Mn
(the crane is accelerated).

As shown in FIG. 2, if there is no brake release response input within the maximum brake release delay time T1, it is determined that the brake is abnormal and a brake abnormality output is generated.

Furthermore, as shown in Fig. 1 (assuming that when the driving command ends at the timing te, the output frequency decreases, and then decreases to the preset brake operating frequency F at the timing ts, then the brake operation frequency will be reduced at the timing ts). 7α of the operation instruction signal (generation of brake operation signal), the brake device operates at timing t4, the brake is closed, and the brake release response input is erased (generation of brake operation response human force).Normally, the brake operation is at its maximum. The brake response input generation timing t4 exists within the range of the delay time T2.With respect to the brake operation response input, the stop operation delay time T
After 3, the crane will stop.

As shown in Fig. 2, if the brake release response input is not erased (existence of brake operation response input) within the maximum brake operation delay time T2, it is determined that the brake is abnormal and a brake abnormality output is generated. .

I, To, T1, T2゜T3 in the above example #1
The contents of the setting tubes of and F are as follows.

(continued operation, non-operation during brake operation) can be reliably detected, and safety measures such as warning, operation, and stop can be quickly and reliably performed.

〔Effect of the invention〕

The present invention is based on the brake release (4411 work) J'! When the brake release (operation) response human force that outputs the indicated output exceeds the set brake release (operation) maximum delay time range, an abnormal brake output is generated. malfunction (when the brake is released)

[Brief explanation of the drawing]

Fig. 1 is a time chart for explaining the control method when the brake operation of the crane according to the present invention is normal, and Fig. 2 is a time chart yard for explaining the control method when the brake operation is abnormal. . ■ is the brake operation instruction output exit current level, T is the maximum brake opening delay time, To is the frequency rise delay time, T
2 is the maximum brake operation delay time, F is the brake operation frequency, and T3 is the stop operation delay time.

Claims (1)

[Claims] In a crane brake operation control method that controls the brake operation when a motor is controlled by an inverter when a forward or reverse movement command is issued, the output current value of the inverter is compared with a set value after a forward or reverse operation command is issued. A brake operation control for a crane, characterized in that a brake operation instruction signal is sent out, and thereafter, when there is no change in brake response input after a predetermined time delay, it is determined that there is an abnormality in the brake or brake control equipment, and a brake abnormality output is output. Method.