A method for judging shearing of steel plates

Abstract

The present invention discloses a method for judging whether a steel plate is sheared, wherein a grating is arranged at the lower shearing blade position of a shearing machine; the trigger control of the grating is triggered following the start instruction of the shearing machine, and the detection signal of the grating is connected to the PLC of the shearing machine; the grating detects the falling condition of the sheared steel plate on the shearing machine to judge whether the steel plate on the shearing machine is sheared. The present invention solves the bottleneck of unmanned, intelligent and automated improvement of the shearing machine.

Description

Technical Field

[0001] The invention relates to shearing technology in the metallurgical industry, and more specifically to a method for judging whether a steel plate is sheared. Background Art

[0002] Conventional shearing machines shear steel plates by applying shearing force to the steel plates through the relative movement between the moving upper blade and the fixed lower blade. After the shearing is completed and the shear blade automatically returns to zero, it is unknown whether the steel plate is cut. Now it depends on the operator's visual judgment. Therefore, a shearing machine is equipped with at least one operator to operate it. Once the steel plate is not cut but the operator does not find it, continuing the subsequent operation will cause equipment and process accidents, which becomes a bottleneck for realizing unmanned, intelligent and automated improvements of shearing machines.

[0003] In the existing technology, for example, the "Rapid Detection Method for Cutting State of Carbon Fiber Composite Material Tow Band" (authors: Tao Yichun, Jia Shuhai, Duan Yugang, Zhang Xiaohui, Chen Hualing) published in the Journal of Xi'an Jiaotong University on January 1, 2015 disclosed that in order to solve the problem that the cutting state of carbon fiber tow band cannot be accurately and effectively identified in a narrow space, a detection method for the cutting state of carbon fiber tow band based on electrical signals is proposed, and the corresponding cutting state monitoring hardware and software system are designed. The detection method first realizes the real-time acquisition of electrical signals in the cutting process of carbon fiber tow band through a simple detection circuit and a data acquisition card, and then performs low-pass filtering on the collected signal to obtain the peak value of the voltage signal, and compares the peak value with the set detection threshold, so as to effectively identify the cutting state of the carbon fiber tow band. The experimental results show that when the cutting operation is performed, the resistance of the carbon fiber tow band that is not completely cut is 10 to 500Ω, while the resistance of the completely cut tow band is infinite. The tow band is connected to the detection circuit, and the change in resistance can be reflected in the voltage change between the two electrodes. In the experiment, when the fiber band is completely cut, the voltage at both ends of the fiber band jumps from 0V to 4.37703V, which is greater than the set threshold value. When the fiber band is not completely cut, the voltage at both ends of the fiber band jumps from 0V to 0.06797V, which is less than the set threshold value of 1V. Both can effectively identify the cut state, proving that the detection result of this method is relatively accurate. This method can be used for detection in the narrow space inside the fiber placement head, and can quickly identify the cut state of the carbon fiber fiber band.

[0004] This technology collects electrical signals in real time and detects resistance to determine whether it has been cut. However, this is not the case with steel plates. The shears used to cut steel plates are made of iron, and the steel plates are also made of iron, so they cannot be detected. Summary of the invention

[0005] In view of the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide a method for judging the shearing of steel plates, so as to solve the bottleneck of unmanned, intelligent and automated improvement of shearing machines.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A method for judging whether a steel plate is sheared:

[0008] A grating is set at the exit position of the lower shearing blade of the shearing machine;

[0009] The trigger control of the grating is executed following the start-up instruction of the shearing machine, and the detection signal of the grating is connected to the PLC of the shearing machine;

[0010] The grating is used to detect the falling condition of the steel plate cut off from the shearing machine, thereby judging whether the steel plate on the shearing machine is cut off.

[0011] Preferably, the grating includes a first grating and a second grating;

[0012] The first grating is arranged at the exit side of the lower shearing blade of the shearing machine, and its detection signal is connected to the PLC of the shearing machine;

[0013] The second light barrier is triggered following a start instruction of the shearing machine.

[0014] Preferably, the first grating is vertically arranged, and the distance between the first grating and the lower shearing blade of the shearing machine is 5 to 50 mm.

[0015] Preferably, the effective position detected by the first grating is flush with or beyond the plane of the cutter table of the lower shearing blade of the shearing machine.

[0016] Preferably, the steel plate shearing judgment method is specifically as follows:

[0017] When the shearing machine is started and the value of the second grating is triggered to change from 0 to 1 and then from 1 to 0, the first grating starts detection;

[0018] The first grating detects the steel plate cut off on the shearing machine. If the steel plate is cut off and falls off, the first grating is not blocked, and the detection feedback value is 0, it is normally cut; if the steel plate is not cut off, the first grating is blocked, and the detection feedback value is 1, it is not cut off, and an alarm signal is immediately sent, and the shearing machine is stopped until it is reset manually.

[0019] The invention provides a steel plate shearing judgment method, which realizes real-time judgment on whether the steel plate is sheared or not after shearing, can effectively avoid equipment and process accidents caused by failure to shear, and facilitates unmanned and intelligent improvements on the shearing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the arrangement of gratings in the steel plate shearing judgment method of the present invention;

[0021] Figure 2 yes Figure 1 A side view schematic diagram of

[0022] Figure 3 It is a schematic diagram of judging the shearing of a steel plate by the method for judging the shearing of a steel plate of the present invention;

[0023] Figure 4 It is a schematic diagram of the method for judging steel plate shearing of the present invention for judging that a steel plate is not sheared;

[0024] Figure 5 It is a schematic flow chart of the steel plate shearing judgment method of the present invention. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Combination Figure 1 and Figure 2 As shown, the present invention provides a method for judging steel plate shearing:

[0027] A grating is set at the position of the lower shearing blade 1 of the shearing machine, and the grating includes a first grating 2 and a second grating 3. The first grating 3 is set at the outlet side of the lower shearing blade 1 of the shearing machine and fixed on the arch 4 of the shearing machine. Its detection signal is connected to the PLC of the shearing machine as a necessary judgment condition for the completion of shearing.

[0028] The second grating 3 is triggered following the start-up instruction of the shearing machine, and the grating is effectively triggered only when the shearing machine receives the shearing instruction.

[0029] The spacing between the first grating 2 and the lower shearing blade 1 of the shearing machine is 5-50 mm. The first grating 2 is arranged in a vertical direction and can be perpendicular or inclined outward relative to the knife table surface of the lower shearing blade 1 of the shearing machine.

[0030] The effective position detected by the first grating 2 is flush with or beyond the plane of the cutter table of the lower shearing blade 1 of the shearing machine.

[0031] The steel plate shearing judgment method of the present invention is specifically as follows:

[0032] When the incoming material 100 is normally sheared on the shearing machine, the sheared steel plate 200 falls down, and the first grating 2 is not blocked (such as Figure 3 As shown), at this time, the detection feedback value is 0, that is, the incoming material 100 is cut normally; when the incoming material 100 is cut on the shearing machine, the steel plate 200 that should be cut does not fall off, and the first grating 2 is blocked (as shown). Figure 4 As shown), at this time, the detection feedback value is 1, that is, the incoming material 100 is not cut off.

[0033] Combination Figure 5 As shown, the first grating 2 is not triggered to work when the incoming material 100 is conveyed or in any other state. When the shearing machine is started and the state value of the second grating 3 is triggered to change from 0 to 1 and then from 1 to 0, the first grating 2 starts to detect.

[0034] When the feedback value of the first grating 2 is 0, it means that the incoming material 100 is cut normally, and the first grating 2 is in a waiting state; when the feedback value of the first grating 2 is 1, it means that the incoming material 100 is not cut, an alarm signal is immediately sent, and the shearing machine is stopped at the same time, waiting for manual processing and reset.

[0035] In summary, the steel plate shearing judgment method of the present invention realizes real-time judgment of whether the steel plate is sheared after shearing, which can effectively avoid equipment and process accidents caused by failure to shear, and facilitates the unmanned and intelligent improvement of the shearing machine.

[0036] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A method for judging whether a steel plate is sheared, characterized in that: A grating is set at the exit position of the lower shearing blade of the shearing machine; The trigger control of the grating is executed following the start-up instruction of the shearing machine, and the detection signal of the grating is connected to the PLC of the shearing machine; The grating detects the falling condition of the steel plate cut off from the shearing machine, thereby judging whether the steel plate on the shearing machine is cut off. The grating includes a first grating and a second grating; The first grating is arranged at the exit side of the lower shearing blade of the shearing machine, and its detection signal is connected to the PLC of the shearing machine; The second grating is triggered following the start-up instruction of the shearing machine, The steel plate shearing judgment method is specifically as follows: When the shearing machine is started and the value of the second grating is triggered to change from 0 to 1 and then from 1 to 0, the first grating starts detection; The first grating detects the steel plate cut off on the shearing machine. If the steel plate is cut off and falls off, the first grating is not blocked, and the detection feedback value is 0, it is normally cut; if the steel plate is not cut off, the first grating is blocked, and the detection feedback value is 1, it is not cut off, and an alarm signal is immediately sent, and the shearing machine is stopped until it is reset manually.

2. The method for determining whether a steel plate is sheared according to claim 1, wherein: The first grating is vertically arranged, and the distance between the first grating and the lower shearing blade of the shearing machine is 5 to 50 mm.

3. The method for determining whether a steel plate is sheared according to claim 1, wherein: The effective position detected by the first grating is a knife table plane that is flush with or exceeds the lower shearing edge of the shearing machine.

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