JPH0248359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a monitor device for a press load meter.

(Prior Art) In a press load meter, an elongation amount detector for detecting the elongation of the frame is attached to the frame, and the press load is measured from the elongation of the frame during pressing. Therefore, a monitor device is provided for displaying and monitoring the measured values. One frame elongation detector may be attached to the frame, or one on each side. In the prior art, in the case of the latter two-point measurement, the monitor device only displays the average value of the measurement values obtained by each detector. Further, the conventional load cell is used only for the purpose of preventing the press machine from being overloaded, and the overload monitoring according to the mold is not performed.

Conventional devices include, for example, an invention that outputs an alarm when the deviation value of the left and right loads exceeds a predetermined value, as seen in Japanese Patent Application Laid-Open No. 55-78000, and an invention as seen in Japanese Patent Application Laid-Open No. 54-42081. There is a known invention in which the press load is calculated from the average value of the loads detected through detectors provided on the left and right columns to prevent overload.

None of these conventional technologies has a function to independently set the allowable load values for the left and right frames, and furthermore, it is necessary to set the load on either the left or right frame or the sum of the loads on the left and right frames. There was a problem in that it was not possible to carry out fine-grained load management, that is, load monitoring, that was most appropriate for the characteristics of the mold, because it did not have a function to select and display the characteristics of the mold.

(Problems to be Solved by the Invention) The present invention provides a monitoring device that can manage or monitor the load of a press depending on the mold.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes detectors provided on the left and right frames of a press to detect the loads applied to each frame based on the elongation of the frames, and detectors installed on the molds. a setting means for independently setting a corresponding load value as an allowable value for the load of the left and right frames; an alarm means for individually notifying the load values of the left and right frames detected by the detector, or a switching means for selectively displaying an arbitrary load value from among the load values of the left and right frames detected by the detector or the sum of the load values of the left and right frames; and a display means for displaying the load value outputted by the load.

(Example) Next, an example of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of the operation panel unit that implements the monitor device of the embodiment, in which 1 is a panel, and five lamps 2, 3, 4, 5, and 6 are arranged horizontally in a row on the upper stage. . The central lamp 4 is for displaying that measurement is in progress. The lamps 2, 3 and 5, 6 provided on the left and right sides of this lamp 4 are alarm means for warning when the load of the left and right frames detected by the detector becomes larger than a set tolerance value. It is. The two lamps 2 and 3 on the left side are related to the detector on the left frame of the press frame (not shown), lamp 2 is for indicating overload, lamp 3 is for indicating overload.
This is to indicate that the load has exceeded the allowable value set for the mold. The two lamps 5 and 6 on the right side are for the detector attached to the right frame, lamp 5 corresponds to overload and lamp 6 corresponds to set load.

A display window 7 provided below these lamps displays a number representing the measured load in tonnage. The two digital switches 8 and 9 provided below the display window 7 are for setting the load according to the mold, and the digital switch 8 is for the left detector, and the digital switch 9 is for the right detector. This corresponds to the detector. The switch 10 serves as a switching means for displaying the numbers displayed on the display window 7 by switching between the detection results of the left detector, the detection results of the right detector, and the total value of both. . The reset button 11 is for erasing the display on the display window 7, and the zero adjustment button 12 is for zero adjustment.

In FIG. 2 showing the configuration of these electrical circuits, 13 is a left detector, and 14 is a right detector. Since both the right and left circuits are the same circuit, only one will be described, and the other will be shown only with a numeral. The output of the detector 13 is converted by an A/D converter 15 into a digital value of tonnage corresponding to the elongation, and is input to comparators 16 and 17. Comparator 1
The other input of 6 is provided by a digital switch 18 which sets the overload value for the press machine. The other input of the comparator 17 is a mold-dependent load value (set load) given by the digital switch 8. When the output of the A/D converter 15 becomes larger than the overload value, the comparator 16 operates the overload detection relay 20 via the relay driver 19 to stop the operation of the press machine, and at the same time, The lamp 2 is turned on to notify that there is an overload.

On the other hand, if the output of the A/D converter 15 is greater than the value given to the digital switch 8 depending on the mold, an output is output from the comparator 17 and an overload is detected via the relay driver 21. The relay 20 is activated and the lamp 3 is turned on. It is exactly the same for the right side, 22 is an A/D converter, 2
3 and 24 are comparators, 25 is a digital switch for setting an overload value, 9 is a digital switch for the aforementioned set load, and 26, 2 are digital switches for setting an overload value.
7 is a relay driver for operating the overload detection relay 20.

The output of the switch 10 for switching the display is input to a left selection AND gate 28, a right selection AND gate 29, and a common AND gate 30. The left selection AND gate 28 includes the A/D converter 1
5 is input, and the output from the right A/D converter 22 is input to the right selection AND gate 29. In addition to the output of the switch 10, the output of the adder 31 is input to the common AND gate 30. The adder 31 is connected to the A/D converter 15 and the A/D
It adds the output values of the converters 22, and the output of each gate is connected to the display 32, and either the output of each A/D converter 15, 22 or the added value is displayed according to the selection of the switch 10. indicate. This display 32 includes the display window 7 in FIG.
Needless to say, this is what is displayed on the screen.
Further, the display 32 can be adjusted to zero using the button 12.

Each A/D converter 15, 22 and display 3
2 is reset via the OR gate 34 by the reset switch 11 and rotary cam switch 33. The rotary cam switch 33 is linked to the press machine, turns on when it rotates to a certain angle, and is reset via the OR gate 34, and at the same time lights up the lamp 4 indicating that measurement is in progress via the driver 35. .

(Effects of the Invention) As explained above, the present invention can display the overload for left and right separately in two point measurements, and at the same time display the absolute value of the left and right load values and their total value. , it becomes possible to monitor loads in detail.

Further, since the standard value (tolerable value) for determining whether the left and right loads are overloaded can be set arbitrarily, it is possible to monitor the press load depending on the mold.

[Brief explanation of drawings]

FIG. 1 is a front view of an operation panel section implementing the present invention, and FIG. 2 is a block diagram of an electrical circuit according to the embodiment. 1...Panel, 2-6...Lamp, 7...Display window,
8, 9...Digital switch, 10...Switch, 1
1...Push button, 12...Button, 13, 14...Detector, 15
... A/D converter, 16, 17... Comparator, 18... Digital switch, 19, 21... Relay driver,
20... Overload detection relay, 22... A/D converter,
23, 24... Comparator, 25... Digital switch,
26, 27...Relay driver, 28...Left selection
AND gate, 29...Right selection AND gate, 30...
Common AND gate, 31... Adder, 32... Display, 33... Rotary cam switch, 34...
OR gate, 35...driver.

Claims (1)

[Claims] 1 Detectors are installed on the left and right frames of the press to detect the load applied to each frame based on the elongation of the frame, and the load value corresponding to the mold is set independently for the left and right frames as the allowable load value for the left and right frames. a setting means; an alarm means for individually notifying when the load of the left and right frames detected by the detector becomes larger than a set tolerance value; A monitor for a press load cell comprising a switching means for selecting and displaying an arbitrary load value from the load value of the frame or an added value of the load values of the left and right frames, and a display means for displaying the load value outputted by the switching means. Device.