JPH0557500A - Device for displaying press crank angle - Google Patents

Abstract

PURPOSE:To improve the safety of the press machine by deciding an abnormality of a rotation angle changing amount by comparing the dimensions of the rotation angle corresponding to the on-light segment of the sampling time. CONSTITUTION:In the case that the crank shaft is rotated normally under the prescribed value of the rotation angle changing amount of the sampling period cycle time, the segment of the direction 73 being dependent on the increase of rotation angle is put on light one by one like 1, 2, so on at the neighborhood of the segment 0, 1, so on being on-lighted in the last time. On the other hand, on the abnormal rotation time that the rotation angle changing amount is upper than the prescribed value, the order lighting does not put itself on. Therefore, the generation of abnormality can be displayed surely and the treatment due to the above can be executed rapidly and exactly, and the safety of the press machine is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for displaying an arbitrary angle of a crankshaft of a press machine.

[0002]

2. Description of the Related Art Conventionally, there is a display device for displaying an angle of a crankshaft of a press machine in order to monitor an abnormality of the press machine. In this display device, a sensor for detecting the rotation angle is attached to the crankshaft of the press machine, and a plurality of segments obtained by dividing the rotation angle range of 0 ° to 360 ° are arranged on the display panel. The segment corresponding to the rotation angle detected by the sensor is lit and displayed in real time.

[0003]

However, in the press machine, the rotation speed of the crankshaft of the press may become high in a certain rotation range. In this case, in the conventional display device, since the changing speed of the angle display becomes large, the display cannot catch up, and the lighting of the segments becomes sparse.
Therefore, the operator cannot accurately read the angle at an arbitrary time point, which may lead to a failure to perform accurate monitoring.

There is also a sensual problem that gives the operator the impression that the crankshaft of the press does not rotate smoothly even during normal rotation because the display is intermittent and intermittent. Therefore, on the display, the impression during normal rotation and the impression during abnormal rotation may be the same, and the abnormality may not be clearly captured, which may impair safety.

The present invention has been made in view of such circumstances, and even when the rotation speed of the press is high,
The first is to make it possible to accurately monitor the operation of the press machine without causing the lighting display to be intermittent.
The purpose of this is to improve the safety of the press machine by giving a clear indication to the operator that the press machine is rotating normally during normal rotation and clearly indicating that the press machine is abnormal during abnormal rotation. The purpose is 2.

[0006]

Therefore, according to the first aspect of the present invention, an angle detecting means for detecting a rotation angle of a crankshaft of a press machine and a rotation angle range of the crankshaft are divided into a plurality of segments, A display panel in which the plurality of segments are continuously arranged in one direction in the order of the magnitude of the rotation angle, and a segment corresponding to the rotation angle of the crankshaft is turned on based on the output of the angle detection means. In the display device of the press crank angle, the output of the angle detecting means is sequentially captured at a predetermined sampling cycle, and the rotation angle captured at this sampling and the rotation corresponding to the segment turned on at the previous sampling are captured. The direction of increase and decrease of the rotation angle is determined by comparing with the size of the angle, and the change amount of these two rotation angles is also determined. When it is determined that the change amount is less than or equal to a predetermined value, and the change amount is determined to be less than or equal to the predetermined value, the segments in the determined increasing or decreasing direction are sequentially adjacent to the segment turned on at the previous sampling. I try to turn it on.

Further, in the second aspect of the present invention, the output of the angle detecting means is sequentially captured at a predetermined sampling cycle, and the segment corresponding to the rotation angle captured at the current sampling and the rotation captured at the previous sampling are acquired. The segments corresponding to the angles are turned on, and the segments arranged between the two segments are turned on.

[0008]

According to the structure of the first aspect of the invention, when the amount of change in the rotation angle during the sampling period is less than or equal to a predetermined value and the crankshaft is rotating normally, the segment turned on during the previous sampling Next to the increase of rotation angle,
The segments in the direction corresponding to the decreasing direction are sequentially turned on.
That is, lighting does not occur intermittently during normal rotation, giving the operator an impression that there is no discomfort, and the rotation angle can be read from the lighting display without error.
On the other hand, during abnormal rotation in which the change amount of the rotation angle becomes larger than a predetermined value, the above-mentioned sequential lighting is not performed (an abnormal signal is output). As a result, on the display, the difference between the normal rotation and the abnormal rotation becomes clear, the operator can perform accurate monitoring, and the safety is improved.

According to the structure of the second invention, the segment group connecting the segment corresponding to the rotation angle sampled last time and the segment corresponding to the rotation angle sampled this time is sequentially turned on. Therefore, it is possible to perform accurate monitoring without intermittent lighting.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a press crank angle display device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the embodiment. An encoder is attached to a motor for rotationally driving a crankshaft of a press machine (not shown), and the rotational position of the motor, that is, the press machine. Crankshaft rotation angle θ
Is detected and the detected value θ is output to the calculation unit 50. Arithmetic unit 5
0 is configured mainly by the CPU, and performs the processing shown in FIG. 4 or FIG. 5 described later according to the display mode “1” or “2” selected by the selection switch 60, depending on the execution result. The display data K is output to the display unit 70.

The display unit 70 has a display panel 71 as shown in FIG. 3, and the display data K input from the calculation unit 50.
In response to this, a lighting display described later is displayed on the display panel 71.
The display panel 71 is arranged at a position where the operator can easily see it, and the selection switch 60 is also arranged at a position where the operator can easily operate. Now, the press angle display portion 7 on the display panel 71 shown in FIG.
In 2, the rotation angle θ of the crankshaft is lowered by the punch,
It is displayed to correspond to the upward movement. That is, the rotation angle range of the crankshaft per cycle is 0 ° (punch top dead center) to 180 ° (punch bottom dead center) to 360 ° (0 °
Matches 36 segments in total, 0, 1, 2, ...
18 ... 34, 35, and these segments 0, 1 ... Are continuously arranged in a line in an elliptical shape in the order of the rotation angle magnitudes of 0 ° to 360 °. Of these, segments 0 and 18 correspond to a rotation angle of 0 ° (punch top dead center) and a rotation angle of 180 ° (punch bottom dead center), respectively. Each of the segments 0 to 35 is composed of, for example, a light emitting diode, and the segment corresponding to the contents of display data K described later is turned on.

The segments other than the segment 18 are illuminated in green, for example, and the segment 18 corresponding to the bottom dead center is illuminated in yellow. From this, it is possible to clearly grasp the time when the punch reaches the bottom dead center.

The direction display portions 73 and 74 display the direction of rotation of the crankshaft in accordance with the arrow and are also composed of light emitting diodes. When it is determined in the process described later that the crankshaft is "forwardly rotating", that is, when it is determined that the rotation angle θ is changing in the increasing direction, the arrow 73 is turned on, and conversely. When it is determined that the axis is "reverse", that is, when it is determined that the rotation angle θ is changing in the direction of decreasing, the arrow 74
Is lit. Reference numeral 75 denotes a display unit that digitally displays the rotation angle of the crankshaft in accordance with the display data K obtained by the process described later, and is composed of, for example, a liquid crystal.
In this case, when displaying the rotation angle other than bottom dead center,
The green color is displayed, and the red color is displayed when the rotation angle corresponding to the bottom dead center is displayed so that the time when the punch reaches the bottom dead center can be clearly captured, as in the segments 0 to 35. Is displayed.

Similarly, 76 is also made of liquid crystal,
The separation distance between the punch and the die is digitally displayed based on the display data K.

The press speed display section 77 is composed of a plurality of segments similarly to the press angle display section 72, and the rotation speed of the crankshaft, that is, the descending and ascending speeds of the punch, is the number of illuminated segments. A display that will be captured is displayed. Reference numeral 78 is a portion for digitally displaying the speed.

Further, the mark group 79 is for warning of abnormality of each part of the press machine, and the light emitting diode arranged on the back side of the corresponding mark is turned on in response to detection of abnormality of a predetermined portion. The mark is lit by so that the abnormality of the relevant part can be recognized. Since the press speed display portions 77, 78 and the mark group 79 are not directly related to the present invention, detailed description thereof will be omitted below.

The processing performed by the arithmetic unit 50 will be described below with reference to the flow charts shown in FIGS. 4 and 5. FIG. 2 is a diagram used to explain the process of FIG. 4, and 0 to 35 in the figure correspond to the segments 0 to 35 of the press angle display section 72. Now, as an operator, display modes "1" and "2" for making different displays on the press angle display section 72 on the display panel 71.
Can be arbitrarily selected according to the operation of the selection switch 60.

When the display mode "1" is selected by the selection switch 60, the processing shown in FIG. 4 is executed.

First, i is set to 1 (step 10
1) The press crank rotation angle θ is input from the encoder 40 (step 102). Note that i is a code indicating the sampling time point of θ. Then the rotation angle θ is 0 °
It is determined whether or not it is within the normal range of less than 360 ° (corresponding to 0 °) (step 103), and if it is within the normal range, the process proceeds to the next step 104, but a signal indicating the rotation angle θ is output. When the rotation angle θ indicates 360 ° or more, which is originally impossible due to the inclusion of noise, the following processing cannot be performed, and therefore the procedure shifts to step 102 again to acquire the rotation angle θ. Will be done again. The segments 0 to 35 are not lit unless the rotation angle θ in the normal range is obtained. Therefore, an operator who recognizes that the lighting is not performed for a long time can inspect the press machine and perform a process of removing the influence of the noise or the like.

In step 104, the input rotation angle θ
The display data K corresponding to is calculated as in the following equation (1).

Ki = [θ / 10] (1) where the symbol [X] indicates the integer part of X. Note that θ /
If the remainder of 10 is 5 or more, +1 is further added to be the content of Ki. As a result, the value of θ is 0 ° to 4 °, 5
° ~ 14 °, 15 ° ~ 24 °, ... 345 ° ~ 359 °
, The value of Ki is set to 0, 1, 2, ..., 35. The values 0, 1, 2, ... Of this display data Ki are segment 0,
It corresponds to 1, 2, ... (Step 104).

Next, it is determined whether i is 1 (step 105).

Initial state Since i is 1 at the start of sampling, the segment indicated by the data K1 corresponding to the currently detected rotation angle θ is turned on. For example, θ is 2 ° and K1
Is 0, segment 0 is illuminated as shown by the solid squares in FIG. The lit segment remains lit until a new segment is lit at the next sampling (step 10).
6). Hereinafter, i is incremented (step 11
7), the procedure moves to step 102 again.

During normal rotation If it is determined that the initial state is not reached (NO at step 105), the display data Ki at the current sampling (for example, K8 = 8) and the data Ki-1 at the previous sampling (1) The magnitude of K7 = 6) is compared (step 107). As a result, the previous data Ki-1
If the current data Ki (6) is larger than (8), it is determined whether or not the variation amount Ki-Ki-1 (2) is greater than or equal to a predetermined threshold value ε (for example, 15). It
This threshold value ε is a threshold value for judging an abnormal situation in which the rotational speed of the crankshaft becomes abnormally high for some reason (step 108). As a result, if it is determined that there is no abnormality, the arrow 73 indicating the normal rotation is turned on because it is currently rotating normally as shown by the arrow A in FIG. Segment Ki-1 corresponding to data Ki-1 (6)
Segment (Ki-1 + 1) adjacent to (6) in the forward direction
(7) is turned on. However, when Ki-1 is 35, the content of Ki-1 + 1 is 0 (step 10).
9).

Then, the content of Ki (K8) is set to data Ki-1 + 1 (7) indicating the illuminated segment (step 110), and i (8) is incremented (i = 9) (step 117). ..

After that, if the normal rotation is normal, step 1
Even if the data at the time of this sampling obtained in 04 changes intermittently with K9 = 10 and K10 = 12,
In step 109, the segments K8 (7) + 1 = 8 and K9 (8) + 1 = 9 adjacent to the previously lighted segment are sequentially lighted. As described above, the segments 6, 8, 10, 1 are conventionally used in the section where the crankshaft speed is high.
According to the embodiment, although 2 ... is lit intermittently,
The segments 6, 7, 8, 9, ... Are lit continuously without interruption, and the operator can be given an impression that there is no discomfort.

On the other hand, when it is judged in step 107 that the data Ki at this time of sampling is smaller than the data Ki-1 at the previous time, it means that the rotation is reversed as shown by arrow B in FIG. Step 10 above
The same processing as 8, 109, 110 is performed in steps 111, 1
It is executed at 12, 113. That is, if the change amount Ki-1−Ki is smaller than the threshold value and is normal (step 1
No. 11), the arrow 74 indicating reverse rotation is lit up, and the segment Ki-1-1 adjacent in the reverse direction to the segment Ki-1 lit up at the time of the previous sampling.
Is lit. However, if Ki-1 is 0, Ki-1
The content of -1 is set to 35 (step 112). Then, the data K indicating the segment whose content of Ki is lit
i-1-1 is set (step 113), and i is incremented (step 117). As a result, even when the reverse rotation is performed, the conventional segments 12, 10, 8, 6 ... Are lit intermittently, but are continuously lit as 12, 11, 10, 9 ,.

When the rotation speed of the crankshaft is low, the data Ki-1 at the previous sampling may coincide with the data Ki at the current sampling. In this case, the previously lit segment Ki-1
Is turned on again (step 115). In the digital display units 75 and 76, the rotation angle corresponding to the illuminated segment is digitally displayed, and the separation distance between the die and the punch corresponding to the rotation angle is also digitally displayed.

At the time of abnormal rotation Ki-1 from step 108 or step 111
If it is determined that the amount of change in Ki is equal to or greater than the threshold value ε, it is an abnormal situation in which the rotational speed of the crankshaft becomes abnormally large for some reason, and a signal indicating the abnormality is output. It Specifically, the operation of the press machine is stopped for safety. The operator may be notified of the abnormality by not turning on the segments 0 to 35 (steps 114 and 11).
6).

Now, when the display mode "2" is selected by the switch 60, the processing shown in FIG. 5 is executed.

In steps 201 to 206, the same processing as in steps 101 to 106 is performed, and i is sequentially incremented (step 212).

If it is determined that the initial state is not reached (NO at step 205), the display data Ki at the current sampling (for example, K8 = 8) and the data Ki-1 at the previous sampling (K7 = 6) are displayed. Are compared in size (step 207). As a result, if it is determined that the data Ki (6) of this time is larger than the data Ki-1 (8) of the previous time, it means that the current rotation is as indicated by arrow A in FIG. The arrow 73 shown is illuminated (step 208), and the segment Ki- corresponding to the data Ki-1 (6) at the time of the previous sampling is displayed.
1 (6) and the segment Ki (8) corresponding to the data Ki at the time of this sampling are lit up,
The segment (7) between these segments (6, 8) is turned on (step 209).

Thereafter, the data at the current sampling obtained in step 204 is K9 = 10 and K10 =
Even if it changes intermittently to 12, at step 209, the segment groups connecting the segment corresponding to the data at the time of the previous sampling and the segment corresponding to the data at the time of this sampling are 8, 9, 10 and 10, 11, 12 will be sequentially turned on. Thus, conventionally, the segments 6, 8, 10, 12, ... Are lit up intermittently in the high crankshaft section, but according to the embodiment, the segment groups of 6, 7, 8 are
The segment groups of 9, 10 and the segment groups of 11, 11, 12 ... Are lit up in strips without interruption, and the operator can be given an impression that there is no discomfort.

On the other hand, when it is determined in step 207 that the data Ki at this time of sampling is smaller than the previous data Ki-1, the same processing is performed. In this case, the reverse rotation is performed as shown by the arrow B in FIG. 2, the arrow 74 indicating the reverse rotation is turned on (step 210), and the data K at the time of the previous sampling is obtained.
The segment groups Ki-1 to Ki connecting the segment corresponding to i-1 and the segment corresponding to the data Ki at the current sampling are turned on (step 209).

As a result, even in the reverse rotation, the segment 1 is conventionally used in the section where the crankshaft speed is high as described above.
According to the embodiment, the segments 2, 11, 8, 6 ...
The segment groups of 0, 9, 8 and the segment groups of 8, 7, 6 ... Are continuously illuminated in a strip shape.

When the rotation speed of the crankshaft is low and the data Ki-1 at the previous sampling coincides with the data Ki at the current sampling, the previously lit segment group is lit again. (Step 21
1). In the digital display units 75 and 76, a segment representing the illuminated segment (for example, a segment corresponding to the data Ki sampled this time).
The rotation angle corresponding to is displayed digitally,
The separation distance between the die and punch corresponding to the same rotation angle is digitally displayed. In the process in FIG. 5, the abnormality determination as shown in steps 108 and 111 in FIG. 4 is not performed. This is because when the display mode '2' is selected, the crankshaft rotation speed does not increase abnormally, and even if an abnormality occurs, the segment groups are lit and there are too many segments. If it is lit, it is possible to judge from the segment display that there is an abnormality. Of course, the abnormality determination may be performed similarly to the display mode '1', and a signal indicating the abnormality may be output.

[0038]

As described above, according to the present invention, the lighting display does not become intermittent even when the rotational speed of the press is high. Therefore, the operation of the press machine can be accurately monitored. In addition, it is possible to give the operator a feeling that the press machine is rotating normally during normal rotation, and it is clearly displayed that there is abnormality during abnormal rotation, so it is possible to quickly and accurately take action in response to the occurrence of abnormality. The safety of the press machine is dramatically improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a press crank angle display device according to the present invention.

FIG. 2 is a diagram conceptually showing an arrangement of segment groups displaying the press crank angle in FIG.

FIG. 3 is a diagram showing a display panel in the display unit shown in FIG.

FIG. 4 is a flow chart exemplifying a process executed by a calculation unit shown in FIG.

5 is a flow chart exemplifying a process executed by a calculation unit shown in FIG.

[Explanation of symbols]

 0 to 35 segment 40 encoder 50 arithmetic unit 70 display unit 71 display panel 72 press angle display unit

Claims (6)

[Claims] 1. An angle detecting means for detecting a rotation angle of a crankshaft of a press machine and a rotation angle range of the crankshaft are divided into a plurality of segments, and the plurality of segments are arranged in order of magnitude of the rotation angle. A display panel arranged continuously in the same direction, and displaying a segment corresponding to the rotation angle of the crankshaft on the basis of the output of the angle detecting means, the press crank angle display device comprising: The output of the unit is sequentially captured at a predetermined sampling cycle, and the rotation angle is increased or decreased by comparing the size of the rotation angle captured at this sampling with the size of the rotation angle corresponding to the segment turned on at the previous sampling. In addition to determining the direction, it is determined that the change amount of these two rotation angles is less than or equal to a predetermined value. If it is determined that the value or less, the last meet adjacent to a segment that is lit at the time of sampling, the determined increased or press crank angle of the display device a decreasing direction of the segments so as to sequentially light up. 2. At the start of the sampling,
The press crank angle display device according to claim 1, wherein a segment corresponding to the rotation angle detected by the angle detection means is turned on. 3. A signal indicating an abnormality is output when the change amount is larger than a predetermined value.
The press crank angle display device described. 4. The press according to claim 1, wherein the segment turned on at the time of the previous sampling is turned on when the segment turned on at the time of the previous sampling is equal to the segment corresponding to the rotation angle fetched at the time of the current sampling. Crank angle display device. 5. An angle detecting means for detecting a rotation angle of a crankshaft of a press machine and a rotation angle range of the crankshaft are divided into a plurality of segments, and the plurality of segments are arranged in order of magnitude of the rotation angle. A display panel arranged continuously in the same direction, and displaying a segment corresponding to the rotation angle of the crankshaft on the basis of the output of the angle detecting means, the press crank angle display device comprising: The output of the means is sequentially captured at a predetermined sampling cycle, and the segment corresponding to the rotation angle captured during the current sampling and the segment corresponding to the rotation angle captured during the previous sampling are lit, and between these two segments. Press crank angle display device that lights up the arranged segments. . 6. At the start of the sampling,
The press crank angle display device according to claim 5, wherein a segment corresponding to the rotation angle detected by the angle detection means is turned on.