JPH035100A - Press brake monitor device - 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 [Field of Industrial Application] The present invention relates to a press brake monitor device that detects brake abnormalities from the coasting angle when the press is stopped.

[Conventional technology]

The drive system of the press is equipped with a brake, and the brake is operated in response to a stop signal to stop the movement of the slide.

Further, the above-mentioned brake has a slippage when braking, and if the amount of slippage becomes large, the slide will overrun even if an attempt is made to stop the slide at the top dead center, and the slide will not be able to stop at the top dead center.

For this reason, conventionally, a standard for the amount of slide from the top dead center of the slide is determined in advance, and an overrun monitoring device is provided that detects an abnormality in the brake when the slide exceeds this standard amount of slip and overruns.

[Problem to be solved by the invention]

However, in conventional presses, brake abnormalities are detected only by an overrun monitoring device, so it is not possible to numerically determine how much the slide is actually sliding or coasting, and the brake effectiveness deteriorates until the slide overruns. There were problems such as not being able to understand.

This invention has been made to improve the above-mentioned problems, and aims to provide a press brake monitor device that detects the coasting angle of the slide and detects brake abnormalities from the coasting angle. It is.

[Means and operations for solving the problem] In order to achieve the above object, the present invention provides a press body with a coasting detector that detects the angle at which the slide coasts after the press stops,
The coasting angle detected by this coasting detector is compared with a preset normal coasting angle, and an abnormal signal is output if the detected coasting angle exceeds the normal coasting angle. , which is designed to notify of brake abnormalities, and by displaying the coasting angle detected at the same time and the normal coasting angle on the display device, it is possible to understand numerically that the brake effectiveness has decreased. The present invention provides a brake monitoring device for a press.

〔Example〕

An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, 1 is the main motor of the press (not shown), the rotation speed of which is detected by a rotation detector 2 such as a tacho generator, and the detection signal (voltage) output from the rotation detector 2 is sent to an A/D converter 3. The signal is converted into a digital signal and input to the input circuit 4.

The input circuit 4 also includes a coasting angle detector 5 such as an encoder that detects the coasting angle θ of the slide, and a clutch brake valve 6 that controls on/off a clutch brake (both not shown) provided in the slide drive system. Signals are input, and these signals are sent from the input circuit 4 to the arithmetic processing unit 7.
It is now sent to.

The arithmetic processing unit 7 has a circuit configuration shown in FIG. 2, for example, and compares the coasting angle θ of the slide with a pre-stored normal value based on the input signal by the action described later. However, if the value exceeds the normal value, an abnormality signal is output.

Further, a display device 9 is connected to the output side of the arithmetic processing device 7 via an output circuit 8, and the slide speed, the actual coasting value, and the normal value are displayed on the display device 9, respectively. There is.

Next, the operation will be explained using the flowchart shown in FIG. 3. During press operation, the rotation detector 2 and the coasting angle detector 5 input the respective values to the arithmetic processing device 7, and the values are displayed on the display device 9. ing.

In addition, the arithmetic processing unit 7 performs step 1 of the flow shown in FIG.
From the rotational speed signal inputted from the rotation detector 2, the normal coasting angle θT is retrieved from a ROM table prepared in advance, and the process proceeds to step (2).

In step (2), the allowable coasting angle is calculated by multiplying the normal coasting angle θT by the allowable amount K (>1), and the process proceeds to step (2).

In step ■, it is determined whether an off signal is input from the clutch brake valve 6, and if an off signal is input, the process proceeds to step ■, where the lower order (1 degree unit) of the signal input from the coasting angle detection 5 is input to the counter circuit. 11, and proceed to step (2).

When the coasting angle detector 5 stops in step (2) and the stoppage of the slide is confirmed, in step (2) the coasting angle θ counted by the counter 11 and the normal coasting read out from the ROM table in the storage device 12 Angle θ. The value KX multiplied by the allowable angle K
The θ angle is compared by comparison circuits 13 and 14, and if the coasting angle θ is less than the normal value (θ<KXθa), a normal signal is output and the press operation continues.

However, at step ■, the coasting angle θ exceeds the normal value (θ
> KXθT) and proceed to step ■ to generate an abnormal signal,
After that, an emergency stop process will be performed to prohibit the press from operating.

Note that 15 in the figure is a press stop timer.

〔Effect of the invention〕

As described in detail above, this invention detects the coasting angle of the slide every time the press is stopped, compares it with a preset normal coasting angle, and if the detected value exceeds the set value, Since an abnormality signal is output, it becomes possible to easily determine whether there is an abnormality in the brake.

In addition, since the normal value and the actual measured value are displayed on the display device, by comparing these values, it is now possible to understand numerically when the brake effectiveness has deteriorated, and this makes it possible to improve brake maintenance. You will be able to operate the press safely by being able to perform these operations accurately.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a block diagram, FIG. 2 being a circuit diagram, and FIG. 3 being a flow chart showing the operation. 5 is a coasting angle detector, and 9 is a display device.

Claims (2)

[Claims] (1) The press body is provided with a coasting detector 5 that detects the angle at which the slide coasts after the press stops, and the coasting angle θ detected by the coasting detector 5 and the coasting angle θ during normal operation set in advance are Compare the running angle θ_T, and the detected coasting angle θ is the normal coasting angle θ.
A press brake monitor device that outputs an abnormal signal when _T is exceeded. (2) The press brake monitoring device according to claim 1, wherein the display device 9 displays a coasting angle θ at which the slide coasts after the press stops, and a normal coasting speed θ_T according to the slide speed.