A laser cutting machine plate overweight alarm device

Abstract

The utility model belongs to the field of laser cutting technology, and specifically provides a laser cutting machine plate overweight alarm device, which includes a silicon dioxide weighing sensor installed at the foot of the bed and a laser scanning sensor installed under the large surrounding sheet metal at the exchange table; the device also includes an amplifier circuit and an FPGA data processing unit; the silicon dioxide weighing sensor is connected to the FPGA data processing unit through the amplifier circuit; the laser scanning sensor is connected to the FPGA data processing unit; the FPGA data processing unit is connected to an alarm unit. By setting a comparator to compare the calculation result with the alarm threshold, an alarm is issued according to the comparison result, thereby avoiding problems such as bed deformation and additional personal injury, and protecting the life and property safety of users.

Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting, in particular to an overweight alarm device for a plate of a laser cutting machine. Background Art

[0002] The cutting power of laser cutting machines is different, and the thickness of the plates that can be cut is also different. The load-bearing capacity of the laser cutting machine bed is designed according to the load-bearing capacity of the full-width plate. That is to say, the load-bearing capacity of the laser cutting machine bed per unit area is certain, but in actual cutting, it is possible to cut plates that exceed the load-bearing capacity of the laser cutting machine. This will cause the laser cutting machine bed to deform when it is overloaded for a long time, causing damage to the laser cutting machine and causing great economic losses.

[0003] When using a laser cutting machine, customers may only focus on how much weight the laser cutting machine can cut, which often leads to the neglect of the weight of the plate per unit area during cutting. Some plates per unit area may be cut that exceed the load-bearing capacity of the bed. This will cause the plate to absorb more heat and transfer the heat to the bed, greatly increasing the possibility of thermal deformation of the bed. In addition, the pressure per unit area of ​​the bed will be very high, which will also cause the bed to deform. Summary of the invention

[0004] When a laser cutting machine cuts a plate whose unit area exceeds the load-bearing capacity of the bed, the plate will absorb more heat and transfer the heat to the bed, which greatly increases the possibility of thermal deformation of the bed. In addition, the pressure received by the bed per unit area will be very large, which will also cause deformation of the bed. The utility model provides a plate overweight alarm device for a laser cutting machine.

[0005] The utility model provides a laser cutting machine plate overweight alarm device, the laser cutting machine includes a large enclosure and a bed and an exchange table arranged inside the large enclosure, the device includes a silicon dioxide weighing sensor installed at the bed foot and a laser scanning sensor installed under the large enclosure sheet metal at the exchange table;

[0006] The device also includes an amplification circuit and an FPGA data processing unit;

[0007] The silicon dioxide weighing sensor is connected to the FPGA data processing unit through an amplification circuit;

[0008] The laser scanning sensor is connected to the FPGA data processing unit;

[0009] The FPGA data processing unit is connected with an alarm unit.

[0010] As a preferred embodiment of the technical solution of the utility model, the device further includes a filtering circuit, and the amplifying circuit is connected to the FPGA data processing unit via the filtering circuit.

[0011] As a preferred embodiment of the technical solution of the utility model, the device also includes an A / D conversion module, and the filter circuit is connected to the FPGA data processing unit via the A / D conversion module.

[0012] As a preferred embodiment of the technical solution of the utility model, the device further comprises a comparator; the FPGA data processing unit comprises a computing processor;

[0013] The laser scanning sensor and the A / D conversion module are respectively connected to the input end of the computing processor;

[0014] The output end of the calculation processor is connected to the input end of the comparator, the input end of the comparator is also connected to a reference value output module, and the output end of the comparator is connected to the alarm unit.

[0015] As a preferred embodiment of the technical solution of the utility model, the comparator and the alarm unit are both arranged in an industrial computer outside the device.

[0016] As a preferred embodiment of the technical solution of the utility model, the amplification circuit includes an operational amplifier, the positive end of the operational amplifier is grounded through a capacitor C2 and a resistor R3 connected in parallel; the silicon dioxide weighing sensor is connected to the reverse end of the operational amplifier through a resistor R1 and a resistor R2 connected in series, the output end of the operational amplifier is also connected to the connection point of the resistor R1 and the resistor R2 through a resistor R4 and a capacitor R3 connected in parallel, the connection point of the resistor R1 and the resistor R2 is also grounded through a capacitor C1, and the output end of the operational amplifier is connected to the filter circuit.

[0017] As a preferred embodiment of the technical solution of the utility model, the filter circuit includes a filter amplifier, the output end of the amplifier circuit is connected to the positive end of the filter amplifier through a resistor R5 and a resistor R6 connected in series, the connection point of the resistor R5 and the resistor R6 is connected to the reverse end of the filter amplifier through a capacitor C4 and a resistor R7 connected in series, the output end of the filter amplifier is also connected to the connection point of the capacitor C4 and the resistor R7, the connection point of the capacitor C4 and the resistor R7 is grounded through a resistor R8, the connection point of the capacitor C4 and the resistor R7 is also grounded through a capacitor C5 and a resistor R9 connected in series, the positive end of the filter amplifier is also grounded through a capacitor C6, and the output end of the filter amplifier is connected to the input end of the A / D conversion module through a resistor R10.

[0018] As a preferred embodiment of the technical solution of the utility model, the number of silica load-bearing sensors is the same as the number of bed footrests.

[0019] As a preferred embodiment of the technical solution of the utility model, each laser cutting machine is installed with four laser scanning sensors.

[0020] It can be seen from the above technical solutions that the utility model has the following advantages: the plate overweight alarm device,

[0021] The service life of the bed is increased. Because the laser cutting machine has an exchange platform, if the plate on it is overweight and the motor is overloaded, it may cause the exchange platform to overshoot and cause personal injury. Setting an overweight alarm device increases the safety of the laser cutting machine.

[0022] In addition, the utility model has a reliable design principle, a simple structure and a very broad application prospect.

[0023] It can be seen that compared with the prior art, the present invention has outstanding substantive features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic block diagram of a device according to an embodiment of the present utility model.

[0026] Figure 2 It is a schematic diagram of an amplifier circuit in an embodiment of the utility model.

[0027] Figure 3 It is a schematic diagram of a filter circuit in an embodiment of the utility model.

[0028] Figure 4 It is a schematic block diagram of a device according to another embodiment of the utility model.

[0029] Figure 5 It is a schematic block diagram of a device according to another embodiment of the present utility model. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] The utility model provides a laser cutting machine plate overweight alarm device, the laser cutting machine includes a large enclosure and a bed and an exchange table arranged inside the large enclosure, the device includes a silicon dioxide weighing sensor installed at the bed foot and a laser scanning sensor installed under the large enclosure sheet metal at the exchange table;

[0032] like Figure 1 As shown, the device also includes an amplification circuit and an FPGA data processing unit;

[0033] The silicon dioxide weighing sensor is connected to the FPGA data processing unit through an amplification circuit;

[0034] The laser scanning sensor is connected to the FPGA data processing unit;

[0035] The FPGA data processing unit is connected with an alarm unit.

[0036] The numerical value collected by the silicon dioxide weighing sensor is converted into a voltage signal through an amplification circuit and input into the FPGA data processing unit.

[0037] In this embodiment, the FPGA data processing unit includes an A / D conversion module, a calculation processor and a comparator;

[0038] The output end of the filter circuit is connected to the input end of the A / D conversion module, and the output end of the A / D conversion module is connected to the input end of the calculation processor;

[0039] The laser scanning sensor is connected to the input terminal of the computing processor;

[0040] The output end of the computing processor is connected to the alarm unit. It should be noted that the computing processor includes a divider, the laser scanning sensor collects the area of ​​the processed plate, and the silica weighing sensor collects the weight of the plate. The two are input into the divider to obtain the weight per unit area, which is input into the comparator. The other input end of the comparator inputs a threshold value, and outputs the comparison result, which is characterized by high and low point levels. For example, if the threshold value is exceeded, a high level is output to the alarm unit to control the alarm unit to alarm. Here, the alarm unit can be implemented using an existing alarm unit or alarm structure.

[0041] The device also includes a filter circuit, and the amplifier circuit is connected to the FPGA data processing unit through the filter circuit. The analog-to-digital conversion circuit converts the analog signal into a voltage signal. During this process, there will be many interference signals, resulting in inaccurate quality of the final output plate. Therefore, a filter circuit should be added to process the collected data to improve the accuracy of the entire plate weight measurement system.

[0042] Different from the first embodiment, Figure 4 As shown, the device also includes an A / D conversion module and a comparator, and the filter circuit is connected to the FPGA data processing unit through the A / D conversion module.

[0043] Here, the FPGA data processing unit includes a computational processor;

[0044] The laser scanning sensor and the A / D conversion module are respectively connected to the input end of the computing processor;

[0045] The output end of the calculation processor is connected to the input end of the comparator, the input end of the comparator is also connected to a reference value output module, and the output end of the comparator is connected to the alarm unit.

[0046] In this embodiment, there is another implementation method in which both the comparator and the alarm unit are arranged in an industrial computer outside the device. The calculation processor inputs the result of the calculation processing into the comparator in the industrial computer, and the input end of the comparator inputs the alarm threshold. The input is compared with the alarm threshold in the comparator. If the threshold is exceeded, the alarm processing is performed, the laser cutting machine stops working, and the customer is reminded to replace the appropriate plate, and the customer is warned that using an overweight plate will cause damage to the bed.

[0047] Different from the first embodiment, Figure 5 As shown, the device also includes an A / D conversion module, and the FPGA data processing unit includes a calculation processor and a comparator;

[0048] The laser scanning sensor and the A / D conversion module are respectively connected to the input end of the computing processor;

[0049] The output end of the calculation processor is connected to the input end of the comparator, the input end of the comparator is also connected to a reference value output module, and the output end of the comparator is connected to the alarm unit.

[0050] In the above embodiment, Figure 2As shown, the amplification circuit includes an operational amplifier, the positive end of the operational amplifier is grounded through a capacitor C2 and a resistor R3 connected in parallel; the silicon dioxide weighing sensor is connected to the reverse end of the operational amplifier through a resistor R1 and a resistor R2 connected in series, the output end of the operational amplifier U1 is also connected to the connection point of the resistor R1 and the resistor R2 through a resistor R4 and a capacitor R3 connected in parallel, the connection point of the resistor R1 and the resistor R2 is also grounded through a capacitor C1, and the output end of the operational amplifier is connected to the filter circuit.

[0051] When the bed adds a plate to the silica load cell, the silica pressure sensor will generate a weak charge signal. After these charges pass through the amplifier circuit, this weak charge signal will be converted into a proportionally amplified voltage signal. After processing and calculation as needed, the mass of the plate on the bed can be obtained. The amplifier circuit is used to convert the charge generated on the surface of the silica load cell into a voltage signal proportional to the surface pressure. The silica load cell is a piezoelectric sensor, so when measuring the plate pressure, the output DC response is relatively poor, so an amplifier circuit is needed to solve the problem of poor response. The amplifier circuit uses LMC660 as the main control chip to convert the charge signal generated by the silica load cell into a recognizable voltage signal, and add the bias voltage to the same-direction input end (positive end) of the charge amplifier circuit. The piezoelectric charge signal generated by the silicon dioxide weighing sensor is converted into an output voltage through the amplifier circuit. The output voltage is calculated by the feedback capacitor C3 in the amplifier circuit and the charge generated by the silicon dioxide weighing sensor. The reverse input end of the amplifier circuit first needs to be connected in series with a resistor R1. The resistance of this resistor is between 1kΩ and 10kΩ to ensure the stability of the charge amplifier circuit and prevent the input current from being generated when there is a sudden increase in voltage. Moreover, the resistance value of resistor R1 cannot be selected too large, which will cause the response to decrease. The main function of the amplifier circuit is to convert the charge generated by the plate pressure into a voltage value for output. There is a certain range for amplifying the charge into a voltage value. When the silicon dioxide weighing sensor receives the pressure of the plate, the amount of charge generated is related to its own sensitivity to force and the pressure of the plate itself.

[0052] In the above embodiment, Figure 3As shown, the filter circuit includes a filter amplifier U2, the output end of the amplifier circuit is connected to the positive end of the filter amplifier through a resistor R5 and a resistor R6 connected in series, the connection point of the resistor R5 and the resistor R6 is connected to the reverse end of the filter amplifier through a capacitor C4 and a resistor R7 connected in series, the output end of the filter amplifier is also connected to the connection point of the capacitor C4 and the resistor R7, the connection point of the capacitor C4 and the resistor R7 is grounded through a resistor R8, the connection point of the capacitor C4 and the resistor R7 is also grounded through a capacitor C5 and a resistor R9 connected in series, the positive end of the filter amplifier is also grounded through a capacitor C6, and the output end of the filter amplifier is connected to the input end of the A / D conversion module through a resistor R10.

[0053] Since the silicon dioxide weighing sensor converts the charge signal into a voltage signal after the amplification circuit, the output signal response will be poor, and there will be additional interference at the same time. Therefore, according to the requirements of the silicon dioxide weighing sensor, after the amplification circuit, before the analog signal is converted into a digital signal, a filtering circuit needs to be added to reduce the poor signal response and interference generated in this process. Connect the voltage output end of the amplifier circuit to the voltage input end of the filter circuit. Filter the amplified signal to eliminate the interference in this process.

[0054] In some embodiments, the number of silica load sensors is the same as the number of bed feet.

[0055] Each laser cutting machine is equipped with four laser scanning sensors.

[0056] The utility model uses a silicon dioxide weighing sensor and a laser scanning sensor and an FPGA data processing unit, an amplifying circuit, an analog-to-digital conversion circuit and a filtering circuit to set up a plate overweight alarm device for the laser cutting machine. The silicon dioxide weighing sensor is used to measure the mass of the plate, and the laser scanning sensor is used to measure the area of ​​the plate on the bed. The two data are calculated and processed to obtain the weight per unit area of ​​the laser cutting machine, which is compared with the weight that the laser cutting machine can bear. If the alarm threshold is exceeded, an alarm is issued. In this way, the bed of our laser cutting machine can be fully protected from the problem of bed deformation caused by overweight plates.

[0057] This new type of silicon dioxide weighing sensor determines the accuracy of the plate weighing result. The silicon dioxide weighing sensor mainly uses the piezoelectric effect of silicon dioxide crystals. When the silicon dioxide weighing sensor is subjected to pressure, it will generate an electrical signal. Then this electrical signal is processed through the auxiliary circuit and finally input to the host computer or output the alarm signal to the alarm unit through the comparator set by the device, so as to achieve the purpose of weighing the plate.

[0058] The piezoelectric signal generated by the silicon dioxide weighing sensor is connected to the amplifier circuit, and the charge is amplified by the amplifier circuit to output an analog voltage signal, which is connected to the input port of the filter circuit. After filtering by the filter circuit, the generated unipolar signal is transmitted to the A / D conversion module or the A / D conversion module inside the FPGA data processing unit. Finally, the analog signal is converted into a digital signal. The FPGA data processing unit pre-processes the data, calculates the actual plate weight borne by the laser cutting machine, and transmits it to the industrial computer through serial communication for comparison with the maximum weight that can be borne. When it exceeds the set alarm threshold, an alarm is issued. Alternatively, the plate weight is calculated and compared with the alarm threshold through a comparator. According to the comparison result, an alarm is issued, the laser cutting machine motor stops moving, the laser stops emitting light, and the user is forced to replace the appropriate plate, avoiding problems such as bed deformation and additional personal injury, and protecting the user's life and property safety.

[0059] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions shall be within the scope of the utility model / any person of ordinary skill in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the utility model, and they shall be within the scope of protection of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope of protection of the claims.

Claims

1. A plate overweight alarm device for a laser cutting machine, the laser cutting machine comprising a large enclosure and a bed and a switching table arranged inside the large enclosure, characterized in that: The device includes a silicon dioxide weighing sensor installed at the foot of the bed and a laser scanning sensor installed under the large surrounding sheet metal at the exchange table; The device also includes an amplification circuit and an FPGA data processing unit; The silicon dioxide weighing sensor is connected to the FPGA data processing unit through an amplification circuit; The laser scanning sensor is connected to the FPGA data processing unit; The FPGA data processing unit is connected with an alarm unit.

2. The laser cutting machine plate overweight alarm device according to claim 1 is characterized in that: The device also includes a filtering circuit, and the amplifying circuit is connected to the FPGA data processing unit through the filtering circuit.

3. The laser cutting machine plate overweight alarm device according to claim 2 is characterized in that: The device also includes an A / D conversion module, and the filter circuit is connected to the FPGA data processing unit via the A / D conversion module.

4. The laser cutting machine plate overweight alarm device according to claim 3 is characterized in that: The device also includes a comparator; the FPGA data processing unit includes a computing processor; The laser scanning sensor and the A / D conversion module are respectively connected to the input end of the computing processor; The output end of the calculation processor is connected to the input end of the comparator, the input end of the comparator is also connected to a reference value output module, and the output end of the comparator is connected to the alarm unit.

5. The laser cutting machine plate overweight alarm device according to claim 4 is characterized in that: The comparator and the alarm unit are both arranged in an industrial computer outside the device.

6. The laser cutting machine plate overweight alarm device according to claim 3 is characterized in that: The FPGA data processing unit includes a computing processor and a comparator; The laser scanning sensor and the A / D conversion module are respectively connected to the input end of the computing processor; The output end of the calculation processor is connected to the input end of the comparator, the input end of the comparator is also connected to a reference value output module, and the output end of the comparator is connected to the alarm unit.

7. The laser cutting machine plate overweight alarm device according to any one of claims 1 to 6, characterized in that: The amplification circuit includes an operational amplifier, the positive end of the operational amplifier is grounded through a capacitor C2 and a resistor R3 connected in parallel; the silicon dioxide weighing sensor is connected to the reverse end of the operational amplifier through resistors R1 and R2 connected in series, the output end of the operational amplifier is also connected to the connection point of resistors R1 and R2 through resistors R4 and capacitor R3 connected in parallel, the connection point of resistors R1 and R2 is also grounded through capacitor C1, and the output end of the operational amplifier is connected to the filter circuit.

8. The laser cutting machine plate overweight alarm device according to claim 3, 4, 5 or 6, characterized in that: The filter circuit includes a filter amplifier, the output end of the amplifier circuit is connected to the positive end of the filter amplifier through a resistor R5 and a resistor R6 connected in series, the connection point of the resistor R5 and the resistor R6 is connected to the reverse end of the filter amplifier through a capacitor C4 and a resistor R7 connected in series, the output end of the filter amplifier is also connected to the connection point of the capacitor C4 and the resistor R7, the connection point of the capacitor C4 and the resistor R7 is grounded through a resistor R8, the connection point of the capacitor C4 and the resistor R7 is also grounded through a capacitor C5 and a resistor R9 connected in series, the positive end of the filter amplifier is also grounded through a capacitor C6, and the output end of the filter amplifier is connected to the input end of the A / D conversion module through a resistor R10.

9. The laser cutting machine plate overweight alarm device according to claim 1, characterized in that: The number of silica load cells is the same as the number of bed feet.

10. The laser cutting machine plate overweight alarm device according to claim 1, characterized in that: Each laser cutting machine is equipped with four laser scanning sensors.

Images