Height measurement detection circuit and cutter wheel cutting machine

Abstract

The utility model discloses a height measurement detection circuit and a cutter wheel cutting machine, the height measurement detection circuit comprises a contact height measurement circuit, a non-contact height measurement circuit, a first switching circuit and a main control circuit, the first input end of the first switching circuit is electrically connected with the output end of the contact height measurement circuit; the second input end of the first switching circuit is electrically connected with the output end of the non-contact height measurement circuit, the main control circuit is electrically connected with the output end of the first switching circuit, the first switching circuit comprises a signal receiving end, the main control circuit is electrically connected with the signal receiving end, and the main control circuit is further electrically connected with the motor. According to the utility model, wiring is simplified and assembling efficiency is improved on the basis of switching a contact height measurement signal or a non-contact height measurement signal to be output to an upper computer, and precision of the contact height measurement signal or the non-contact height measurement signal is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of control devices, in particular to a height measuring detection circuit and a knife wheel cutting machine. Background Art

[0002] The cutter wheel cutting machine is a device used for material cutting, and its function is to cut the material according to specific size requirements. On the cutter wheel cutting equipment, if you want to accurately cut the product with the blade, you must determine the initial distance between the lowest point of the blade and the material bearing table, as well as the loss of the blade after cutting for a period of time. Here, the height measurement function is needed, so the cutter wheel cutting equipment generally needs to be equipped with a contact height measurement function or a non-contact height measurement function; the basic principle of contact height measurement is to use the circuit to capture the moment when the blade contacts the platform, and can quickly and accurately determine the distance between the lowest point of the blade and the platform and output the corresponding contact height measurement signal to the host computer; the basic principle of non-contact height measurement is to use the Z axis to slowly descend. When the blade descends to a certain position, the blade will block the corresponding optical fiber. When the light shielding amount of the blade reaches the set light shielding amount, the Z axis position at this time is recorded, so as to obtain the distance between the lowest point of the blade and the platform, and output the corresponding non-contact height measurement signal. When the host computer analyzes the non-contact height measurement signal and obtains that the initial distance is within the preset threshold range, the blade starts cutting the product.

[0003] However, existing knife wheel cutting machines generally design an external circuit to switch the contact height measurement signal or the non-contact height measurement signal to the same port, so as to select the contact height measurement or the non-contact height measurement according to the actual application. However, the external circuit will make the overall circuit structure complicated and the assembly efficiency low, or the contact height measurement signal and the non-contact height measurement signal will be output in parallel to the same port, but the contact height measurement signal or the non-contact height measurement signal may interfere with each other, resulting in interference with the signal finally output to the host computer. Utility Model Content

[0004] The main purpose of the utility model is to provide a height measurement detection circuit and a cutter wheel cutting machine, which aims to simplify wiring and improve assembly efficiency on the basis of switching the contact height measurement signal or the non-contact height measurement signal output to the host computer, and improve the accuracy of the contact height measurement signal or the non-contact height measurement signal.

[0005] To achieve the above object, the utility model proposes a height detection circuit, which is applied to a cutter wheel cutting machine. The cutter wheel cutting machine includes a motor, and the height detection circuit also includes:

[0006] A contact height measurement circuit, the contact height measurement circuit is used to perform contact height measurement on the initial distance between the lowest point of the blade and the sheet carrier and output a corresponding contact height measurement signal;

[0007] A non-contact height measurement circuit, which is used to perform non-contact height measurement on the initial distance between the lowest point of the blade and the sheet carrier and output a corresponding non-contact height measurement signal;

[0008] a first switching circuit, wherein a first input end of the first switching circuit is electrically connected to an output end of the contact height measurement circuit, and a second input end of the first switching circuit is electrically connected to an output end of the non-contact height measurement circuit;

[0009] A main control circuit, the main control circuit is electrically connected to the output end of the first switching circuit, the first switching circuit includes a signal receiving end, the main control circuit is electrically connected to the signal receiving end, and the main control circuit is used to control the first switching circuit to output the contact height measurement signal or the non-contact height measurement signal to the main control circuit;

[0010] The main control circuit is also electrically connected to the motor, and is also used to control the motor to operate according to the contact height measurement signal or the non-contact height measurement signal.

[0011] Optionally, the contact height measurement circuit includes:

[0012] A contact height measurement module, a first amplifier and a photocoupler circuit, wherein the output end of the contact height measurement module is electrically connected to the inverting end of the first amplifier, the non-inverting end of the first amplifier is grounded, the photocoupler circuit comprises a photodiode and a phototransistor, the power supply end of the first amplifier and the input end of the photodiode are both used to access a first voltage, the output end of the photodiode is electrically connected to the inverting end of the first amplifier, the input end of the phototransistor is electrically connected to the first input end of the switching circuit, and the output end of the phototransistor is grounded.

[0013] Optionally, the first switching circuit includes:

[0014] A first relay circuit, wherein a first input end of the first relay circuit is electrically connected to an output end of the contact height measurement circuit, a second input end of the first relay circuit is electrically connected to an output end of the non-contact height measurement circuit, an output end of the first relay circuit is electrically connected to the main control circuit, and a controlled end of the first relay circuit is electrically connected to the main control circuit.

[0015] Optionally, the contact height measurement circuit further includes:

[0016] A second switching circuit, the third end of the second switching circuit is electrically connected to the contact height measurement circuit, the fifth end of the second switching circuit is grounded, the first end and the second end of the second switching circuit are both electrically connected to the inverting end of the first amplifier, the fifth end and the sixth end of the second switching circuit are both electrically connected to the non-inverting end of the first amplifier, and when the second switching circuit is triggered, its first end is electrically connected to the third end and the sixth end is electrically connected to the fourth end, or its fifth end is electrically connected to the third end and the second end is electrically connected to the fourth end.

[0017] Optionally, the height measurement detection circuit further includes:

[0018] A carbon brush detection circuit and an alarm module, wherein the output ends of the alarm module and the carbon brush detection circuit are electrically connected to the main control circuit, and the carbon brush detection circuit is used to detect the degree of wear of the main shaft carbon brush of the motor and output a corresponding carbon brush detection signal. When the carbon brush detection signal is not within a preset threshold range, the main control circuit controls the alarm module to operate.

[0019] Optionally, the carbon brush detection circuit includes:

[0020] A carbon brush detection module, a second relay circuit and a third relay circuit, the carbon brush detection module is used to output the carbon brush detection signal, the input end of the second relay circuit is electrically connected to the output end of the carbon brush detection module, the first output end of the second relay circuit is electrically connected to the main control circuit, the second output end of the second relay circuit is grounded, and the controlled end of the second relay circuit is electrically connected to the main control circuit; the input end of the third relay circuit is electrically connected to the output end of the contact height measurement circuit, the first output end of the third relay circuit is suspended, the second output end of the third relay circuit is electrically connected to the main control circuit, and the controlled end of the third relay circuit is electrically connected to the controlled end of the second relay circuit, and the main control circuit is used to control the second relay circuit to output the carbon brush detection signal to the main control circuit or ground.

[0021] Optionally, the height measurement detection circuit further includes:

[0022] A first power supply circuit and a second power supply circuit, wherein the first power supply circuit is electrically connected to the power supply end of the contact height measurement module, the input end of the photodiode and the power supply end of the first amplifier respectively, and the second power supply circuit is electrically connected to the power supply end of the non-contact height measurement module and the power supply end of the first switching circuit respectively.

[0023] Optionally, the height measurement detection circuit further includes:

[0024] A first ground terminal and a second ground terminal, the first power supply circuit, the contact height measurement module, and the first amplifier are all connected to the first ground terminal, and the second power supply circuit, the photocoupler circuit, and the non-contact height measurement circuit are all connected to the second ground terminal.

[0025] The utility model also provides a knife wheel cutting machine, comprising a motor and any one of the height measuring detection circuits described above.

[0026] The technical solution of the utility model includes a contact height measurement circuit, a non-contact height measurement circuit, a first switching circuit and a main control circuit. The first input end of the first switching circuit is used to receive a contact height measurement signal, and the second input end of the first switching circuit is used to receive a non-contact height measurement signal. When the main control circuit outputs a corresponding control signal to the first switching circuit, the first switching circuit outputs a contact height measurement signal or a non-contact height measurement signal to the main control circuit. The main control circuit obtains the initial distance between the lowest point of the blade and the sheet bearing table according to the contact height measurement signal or the non-contact height measurement signal. With such an arrangement, in actual applications, the user can select the contact height measurement function or the non-contact height measurement function according to actual needs. For example, the contact height measurement function can be used in occasions where high measurement accuracy is required and the surface hardness of the object to be measured is moderate and not easy to deform, such as in the field of mechanical processing. When measuring the surface Non-contact height measurement circuits can be used for complex, fragile or deformable objects, and in situations where a large amount of measurement data needs to be obtained quickly, such as industrial automation production lines, and the first switching circuit can be composed of a relay circuit. Compared with the existing knife wheel cutting machine that uses an external circuit for switching, the relay can be integrated with the contact height measurement circuit and the non-contact height measurement circuit in the same module, so that the overall circuit structure is relatively simple and the assembly efficiency is improved. Compared with outputting the contact height measurement signal and the non-contact height measurement signal in parallel to the same port, when the relay switches to output one of the signals to the main control circuit, the other signal cannot be output to the main control circuit due to the disconnection of the path between the main control circuit, so that the contact height measurement signal and the non-contact height measurement signal cannot affect each other, thereby improving the accuracy of the contact height measurement signal or the non-contact height measurement signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of a module of an embodiment of the utility model;

[0029] Figure 2This is a schematic diagram of the circuit structure of another embodiment of the utility model;

[0030] Figure 3 This is a schematic diagram of the circuit structure of another embodiment of the utility model;

[0031] Figure 4 This is a schematic diagram of the circuit structure of another embodiment of the utility model;

[0032] Figure 5 This is a schematic diagram of the circuit structure of another embodiment of the utility model;

[0033] Figure 6 This is a schematic diagram of the circuit structure of another embodiment of the utility model;

[0034] Figure 7 This is a schematic diagram of the circuit structure of another embodiment of the utility model.

[0035] Description of Figure Numbers:

[0036] Label name Label name 10 Motor 41 First relay circuit 20 Contact height measurement circuit 50 Main control circuit 21 Contact height measurement module 60 Carbon brush detection circuit 22 Second switching circuit 61 Carbon brush detection module 30 Non-contact height measurement circuit 62 Second relay circuit 40 First switching circuit 70 Alarm module 80 First power supply circuit 90 Second power supply circuit

[0037] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0041] The cutter wheel cutting machine is a device used for material cutting, and its function is to cut the material according to specific size requirements. On the cutter wheel cutting equipment, if you want to accurately cut the product with the blade, you must determine the initial distance between the lowest point of the blade and the material bearing table, as well as the loss of the blade after cutting for a period of time. Here, the height measurement function is needed, so the cutter wheel cutting equipment generally needs to be equipped with a contact height measurement function or a non-contact height measurement function; the basic principle of contact height measurement is to use the circuit to capture the moment when the blade contacts the platform, and can quickly and accurately determine the distance between the lowest point of the blade and the platform and output the corresponding contact height measurement signal to the host computer; the basic principle of non-contact height measurement is to use the Z axis to slowly descend. When the blade descends to a certain position, the blade will block the corresponding optical fiber. When the light shielding amount of the blade reaches the set light shielding amount, the Z axis position at this time is recorded, so as to obtain the distance between the lowest point of the blade and the platform, and output the corresponding non-contact height measurement signal. When the host computer analyzes the non-contact height measurement signal and obtains that the initial distance is within the preset threshold range, the blade starts cutting the product.

[0042] However, existing knife wheel cutting machines generally use external circuits to switch the contact height measurement signal or the non-contact height measurement signal to the same port, but the external circuit will make the overall circuit structure complicated and the assembly efficiency low, or the contact height measurement signal and the non-contact height measurement signal are output in parallel to the same port, but the contact height measurement signal or the non-contact height measurement signal may interfere with each other, resulting in interference with the signal finally output to the host computer.

[0043] To this end, the utility model proposes a height measurement detection circuit and a knife wheel cutting machine, which aim to simplify wiring and improve assembly efficiency on the basis of switching the contact height measurement signal or the non-contact height measurement signal output to the host computer, and improve the accuracy of the contact height measurement signal or the non-contact height measurement signal.

[0044] refer to Figure 1 In one embodiment of the utility model, a height detection circuit is applied to a cutter wheel cutting machine, the cutter wheel cutting machine includes a motor 10, and the height detection circuit includes:

[0045] A contact height measurement circuit 20, the contact height measurement circuit 20 is used to perform contact height measurement on the initial distance between the lowest point of the blade and the sheet carrier and output a corresponding contact height measurement signal;

[0046] A non-contact height measurement circuit 30, which is used to perform non-contact height measurement on the initial distance between the lowest point of the blade and the sheet carrier and output a corresponding non-contact height measurement signal;

[0047] A first switching circuit 40, wherein a first input end of the first switching circuit 40 is electrically connected to an output end of the contact height measurement circuit 20, and a second input end of the first switching circuit 40 is electrically connected to an output end of the non-contact height measurement circuit 30;

[0048] A main control circuit 50, the main control circuit 50 is electrically connected to the output end of the first switching circuit 40, the first switching circuit 40 includes a signal receiving end, the main control circuit 50 is electrically connected to the signal receiving end, and the main control circuit 50 is used to control the first switching circuit 40 to output the contact height measurement signal or the non-contact height measurement signal to the main control circuit 50;

[0049] The main control circuit 50 is also electrically connected to the motor 10 , and the main control circuit 50 is also used to control the motor 10 to work according to the contact height measurement signal or the non-contact height measurement signal.

[0050] In this embodiment, the main control circuit 50 can be implemented by a main controller, such as an MCU (Microcontroller Unit), a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), a SOC (System On Chip), etc.

[0051] Specifically, the technical solution of the utility model includes a contact height measurement circuit 20, a non-contact height measurement circuit 30, a first switching circuit 40 and a main control circuit 50. The first input end of the first switching circuit 40 is used to receive a contact height measurement signal, and the second input end of the first switching circuit 40 is used to receive a non-contact height measurement signal. When the main control circuit 50 outputs a corresponding control signal to the first switching circuit 40, the first switching circuit 40 outputs a contact height measurement signal or a non-contact height measurement signal to the main control circuit 50. The main control circuit 50 obtains the initial distance between the lowest point of the blade and the sheet supporting table according to the contact height measurement signal or the non-contact height measurement signal. With such a configuration, in actual applications, the user can select the contact height measurement function or the non-contact height measurement function according to actual needs. For example, the contact height measurement function can be used in situations where high measurement accuracy is required and the surface hardness of the object to be measured is moderate and not easy to deform, such as in the field of mechanical processing. Yes, the non-contact height measurement circuit 30 can be used in measuring objects with complex, fragile or deformable surfaces, and in situations where a large amount of measurement data needs to be obtained quickly, such as industrial automation production lines, and the first switching circuit 40 can be composed of a relay circuit. Compared with the existing knife wheel cutting machine that uses an external circuit for switching, the relay can be integrated with the contact height measurement circuit 20 and the non-contact height measurement circuit 30 in the same module, so that the overall circuit structure is simpler and the assembly efficiency is improved. Compared with outputting the contact height measurement signal and the non-contact height measurement signal in parallel to the same port, when the relay switches to output one of the signals to the main control circuit 50, the other signal cannot be output to the main control circuit 50 due to the disconnection of the path between the main control circuit 50, so that the contact height measurement signal and the non-contact height measurement signal cannot affect each other, thereby improving the accuracy of the contact height measurement signal or the non-contact height measurement signal.

[0052] refer to Figure 2 In one embodiment of the present utility model, the contact height measurement circuit 20 includes:

[0053] A contact height measurement module 21, a first amplifier U1 and a photocoupler circuit, wherein the output end of the contact height measurement module 21 is electrically connected to the inverting end of the first amplifier U1, the non-inverting end of the first amplifier U1 is grounded, the photocoupler circuit includes a photodiode and a phototransistor, the power supply end of the first amplifier U1 and the input end of the photodiode are both used to access a first voltage, the output end of the photodiode is electrically connected to the inverting end of the first amplifier U1, the input end of the phototransistor is electrically connected to the first input end of the first switching circuit 40, and the output end of the phototransistor is grounded.

[0054] In this embodiment, the photoelectric coupler circuit includes a photoelectric coupler U1, a first resistor R1 and a first diode D1, the first end of the first resistor R1 is connected to the power supply, the second end of the first resistor R1 is electrically connected to the anode of the first diode D1, and the cathode of the first diode D1 is electrically connected to the input end of the photodiode.

[0055] In this embodiment, the output end of the contact height measurement module 21 is electrically connected to the inverting end of the first amplifier U1, and the non-inverting end of the first amplifier U1 is grounded. When the lowest point of the blade just contacts the material sheet supporting table, the level of the contact height measurement signal output by the contact height measurement module 21 is reduced, so that the first amplifier U1 outputs a rising edge signal, the light emitted by the photodiode becomes weaker, and the conduction degree of the phototransistor is reduced, which is equivalent to the main control circuit 50 receiving the rising edge signal. After receiving the rising edge, the main control circuit 50 controls the motor 10 to start working; the main control circuit 50 obtains the initial distance between the lowest point of the blade and the material sheet supporting table according to the output of the non-contact height measurement circuit 30. When the initial distance is within the preset threshold range, the main control circuit 50 controls the motor 10 to work. In this arrangement, the photoelectric coupler circuit serves to isolate the contact height measurement module 21 and the main control circuit 50, thereby improving the anti-interference ability of the circuit. The first amplifier U1 is used to amplify the voltage difference between the in-phase terminal and the inverting terminal so that the rising edge signal output when the lowest point of the blade just contacts the sheet carrier is easier to identify, thereby ensuring the stability of the contact height measurement signal transmission and improving the detection accuracy of the main control circuit 50.

[0056] refer to Figure 3 In this embodiment, the contact height measurement circuit 20 further includes:

[0057] A second switching circuit 22, the third end of the second switching circuit 22 is electrically connected to the contact height measurement circuit 20, the fifth end of the second switching circuit 22 is grounded, the first end and the second end of the second switching circuit 22 are both electrically connected to the inverting end of the first amplifier U1, the fifth end and the sixth end of the second switching circuit 22 are both electrically connected to the inverting end of the first amplifier U1, and when the second switching circuit 22 is triggered, its first end is electrically connected to the third end and the sixth end is electrically connected to the fourth end, or its fifth end is electrically connected to the third end and the second end is electrically connected to the fourth end.

[0058] In this embodiment, the second switching circuit 22 can adopt a double-pole double-throw switch. When the user triggers the double-pole double-throw switch, the first end of the double-pole double-throw switch is electrically connected to the third end and the sixth end is electrically connected to the fourth end. When triggered again, the fifth end of the double-pole double-throw switch is electrically connected to the third end and the second end is electrically connected to the fourth end; the second switching circuit 22 can also adopt a six-pin pin header. The user can connect the first end of the pin header to the third end and the sixth end to the fourth end, or connect the fifth end of the pin header to the third end and the second end to the fourth end through a connector or wire.

[0059] In this embodiment, when the first end of the second switching circuit 22 is electrically connected to the third end and the sixth end is electrically connected to the fourth end, the output end of the contact height measurement module 21 is electrically connected to the inverting end of the first amplifier U1 via the second switching circuit 22, and the in-phase end of the first amplifier U1 is grounded via the second switching circuit 22. When the lowest point of the blade just contacts the sheet-carrying table, the level of the contact height measurement signal output by the contact height measurement module 21 is reduced. Combined with the above embodiment, the main control circuit 50 finally receives a rising edge signal; when the fifth end of the second switching circuit 22 is electrically connected to the third end and the second end is electrically connected to the fourth end, the output end of the contact height measurement module 21 is electrically connected to the in-phase end of the first amplifier U1 via the second switching circuit 22, and the inverting end of the first amplifier U1 is grounded via the second switching circuit 22. When the lowest point of the blade just contacts the sheet-carrying table, the level of the contact height measurement signal output by the contact height measurement module 21 is reduced. At this time, the first amplifier U1 outputs a falling edge signal. As the light emitted by the photodiode becomes stronger, the conduction degree of the phototransistor increases, which is equivalent to the main control circuit 50 receiving the falling edge signal. With this arrangement, when the main control circuit 50 or the main control chip in actual application receives the rising edge signal to control the motor 10 to work, the user can control the first end of the double-pole double-throw switch or the pin header to be electrically connected to the third end and the sixth end to be electrically connected to the fourth end. When the main control circuit 50 or the main control chip in actual application receives the falling edge signal to control the motor 10 to work, the user can control the fifth end of the double-pole double-throw switch or the pin header to be electrically connected to the third end and the second end to be electrically connected to the fourth end. For the user, the user can choose whether the main control circuit 50 or the main control chip receives the rising edge signal or the falling edge signal to control the motor 10 to work according to actual application requirements by simply adjusting the connection method of the double-pole double-throw switch or the pin header. This setting method does not require modification of the hardware circuit or software program, which greatly improves the flexibility and convenience of use.

[0060] refer to Figure 4 In one embodiment of the present utility model, the first switching circuit 40 includes:

[0061] A first relay circuit 41, wherein a first input end of the first relay circuit 41 is electrically connected to an output end of the contact height measurement circuit 20, a second input end of the first relay circuit 41 is electrically connected to an output end of the non-contact height measurement circuit 30, an output end of the first relay circuit 41 is electrically connected to the main control circuit 50, and a controlled end of the first relay circuit 41 is electrically connected to the main control circuit 50.

[0062] In this embodiment, the first relay circuit 41 includes a first relay K1 and a single-pole double-throw switch, the first moving contact of the single-pole double-throw switch is electrically connected to the output end of the contact height measurement circuit 20, the second moving contact is electrically connected to the output end of the non-contact height measurement circuit 30, and the static contact is electrically connected to the main control circuit 50. One end of the first relay K1 is connected to the power supply, and the other end of the first relay K1 is electrically connected to the main control circuit 50. By default, the contact height measurement circuit 20 is electrically connected to the main control circuit 50 via the first moving contact. If the user needs to switch the non-contact height measurement circuit 30, it is necessary to control the voltage of the port electrically connected to the main control circuit 50 and the first relay K1 to be reduced so that the current output by the power supply flows through the first relay K1, and the non-contact height measurement circuit 30 is electrically connected to the main control circuit 50 via the second moving contact.

[0063] refer to Figure 5 In one embodiment of the present utility model, the height detection circuit further includes:

[0064] A carbon brush detection circuit 60 and an alarm module 70, the output ends of the alarm module 70 and the carbon brush detection circuit 60 are electrically connected to the main control circuit 50, the carbon brush detection circuit 60 is used to detect the degree of wear of the main shaft carbon brush of the motor 10, and output a corresponding carbon brush detection signal, when the carbon brush detection signal is not within a preset threshold range, the main control circuit 50 controls the alarm module 70 to work.

[0065] In this embodiment, the carbon brush detection circuit 60 can use a current sensor to detect the current flowing through the spindle carbon brush and judge the degree of wear of the carbon brush according to the change of the current, or use an ultrasonic sensor to emit an ultrasonic signal to the surface of the spindle carbon brush and judge the degree of wear of the carbon brush according to the reflected ultrasonic signal, or use an image sensor to compare the structure of the spindle carbon brush with the structure of the complete spindle carbon brush in real time to judge the degree of wear of the carbon brush. If the carbon brush detection signal is not within the preset threshold range, that is, the degree of wear of the spindle carbon brush cannot meet the working requirements, the main control circuit 50 controls the alarm module 70 to make a corresponding alarm action, such as an audible alarm, a light alarm or a vibration alarm. In this way, in actual application, when the degree of wear of the spindle carbon brush of the motor 10 is large, the main control circuit 50 will promptly control the alarm module 70 to make an alarm action before the user starts the motor 10, thereby promptly reminding the user that the degree of wear of the spindle carbon brush of the motor 10 cannot meet the working requirements. Compared with the existing manual detection, the user does not need to manually disassemble the motor 10 to observe the degree of wear of the spindle carbon brush before starting the motor 10, which saves labor costs and improves detection efficiency.

[0066] refer to Figure 6 In one embodiment of the present utility model, the carbon brush detection circuit 60 includes:

[0067] A carbon brush detection module 61 and a second relay circuit 62, wherein the carbon brush detection module 61 is used to output the carbon brush detection signal, the input end of the second relay circuit 62 is electrically connected to the output end of the carbon brush detection module 61, the first output end of the second relay circuit 62 is electrically connected to the main control circuit 50, the second output end of the second relay circuit 62 is grounded, and the controlled end of the second relay circuit 62 is electrically connected to the main control circuit 50; the main control circuit 50 is used to control the second relay circuit 62 to output the carbon brush detection signal to the main control circuit 50 or ground.

[0068] In this embodiment, the second relay circuit 62 includes a second relay K2 and a single-pole double-throw switch, the static contact of the single-pole double-throw switch is electrically connected to the carbon brush detection module 61, the first moving contact is electrically connected to the main control circuit 50, the second moving contact is grounded, the static contact of the single-pole double-throw switch is electrically connected to the first moving contact by default, the first end of the second relay K2 is connected to the power supply, and the second end of the second relay K2 is electrically connected to the main control circuit 50. The third relay circuit includes a third relay K3 and a single-pole double-throw switch, the first end of the third relay K3 is connected to the power supply, the second end of the third relay K3 is electrically connected to the main control circuit 50, the static contact of the single-pole double-throw switch is electrically connected to the output end of the contact height measurement circuit 20, the first moving contact is suspended, and the second moving contact is electrically connected to the main control circuit 50. The static contact of the single-pole double-throw switch of the third relay K3 circuit is electrically connected to the first moving contact by default, so that the carbon brush detection circuit 60 is also started when the cutter wheel cutting machine is started. When the loss of the spindle carbon brush is small, the main control circuit 50 respectively sends a signal to the third relay K3. The controlled end of the second relay K2 circuit 62 and the controlled end of the third relay K3 circuit output corresponding current signals to electrically connect the static contact of the single-pole double-throw switch of the second relay K2 circuit 62 with the second moving contact, that is, the carbon brush detection module 61 stops working, and the static contact of the single-pole double-throw switch of the third relay K3 circuit is electrically connected to the second moving contact, and the contact height measurement circuit 20 starts to output the contact height measurement signal to the main control circuit 50. If the loss degree of the spindle carbon brush is too large to meet the working requirements, the main control circuit 50 does not output the corresponding current signal to the second relay K2 circuit 62 and the third relay K3 circuit, and the contact height measurement signal cannot be output to the main control circuit 50. In this way, when the loss degree of the spindle carbon brush of the motor 10 meets the working requirements, the cutter wheel cutting machine starts to perform contact height measurement. When the loss degree of the spindle carbon brush of the motor 10 cannot meet the working requirements, the cutter wheel cutting machine cannot perform contact height measurement, that is, the main control circuit 50 cannot control the motor 10 to work, so as to avoid the motor 10 from being unable to operate normally due to the large loss of the spindle carbon brush.

[0069] refer to Figure 7 In one embodiment of the present utility model, the height detection circuit further includes:

[0070] A first power supply circuit 80 and a second power supply circuit 80, wherein the first power supply circuit 80 is electrically connected to the power supply end of the contact height measurement module 21, the input end of the photodiode and the power supply end of the first amplifier U1 respectively, and the second power supply circuit 80 is electrically connected to the power supply end of the non-contact height measurement circuit 30.

[0071] In this embodiment, the first power supply circuit 80 and the second power supply circuit 80 respectively power devices directly electrically connected to the IO port of the main control circuit 50, such as the non-contact height measurement circuit 30, and devices not directly electrically connected to the IO port of the main control circuit 50, such as the contact height measurement module 21, the photoelectric coupler circuit and the first amplifier U1. If the contact height measurement module 21 and the first amplifier U1 share the same power supply with the photoelectric coupler and the non-contact height measurement signal, the power supply noise (such as current fluctuation, voltage ripple, etc.) generated by one module or circuit may be coupled to other modules through the power supply line, thereby affecting the accuracy of the height measurement signal collected by the main control circuit 50 or the contact height measurement signal output by the contact height measurement module 21. Therefore, the first power supply circuit 80 is set to specifically power the contact height measurement module 21 and the first amplifier U1, and the second power supply circuit 80 is set to specifically power the non-contact height measurement circuit 30 and the photoelectric coupler circuit, thereby avoiding the influence of interference signals generated when the cutter wheel cutting machine is working on the contact height measurement and the non-contact height measurement, thereby improving the accuracy and stability of the height measurement.

[0072] In combination with the above embodiments, since the second relay K2 circuit 62 and the third relay K3 circuit are directly electrically connected to the main control circuit 50, the second power supply is electrically connected to the first end of the second relay K2 of the second relay K2 circuit 62 and the first end of the third relay K3 of the third relay K3 circuit to ensure that the signal received by the main control circuit 50 is relatively complete, thereby improving the accuracy of detection.

[0073] refer to Figure 2-7 In one embodiment of the present utility model, the height detection circuit further includes:

[0074] A first ground terminal GND1 and a second ground terminal GND2, the first power supply circuit 80, the contact height measurement module 21, and the first amplifier U1 are all connected to the first ground terminal GND1, and the second power supply circuit 80, the photocoupler circuit and the non-contact height measurement circuit 30 are all connected to the second ground terminal GND2.

[0075] In this embodiment, the noise and interference in the circuit are usually generated when the current flows in the ground loop. When the first power supply circuit 80 and the second power supply circuit 80 share the same ground terminal, the noise and interference between them may be coupled with each other through the ground loop, resulting in a decrease in signal quality. Connecting the first power supply circuit 80 and the second power supply circuit 80 to different ground terminals respectively can cut off this coupling path and reduce the propagation of noise and interference, thereby improving the purity and stability of the signal and preventing them from affecting each other, thereby improving the stability and reliability of the entire circuit system. Connecting the contact height measurement circuit 20 and the non-contact height measurement circuit 30 to different grounds respectively also has a similar effect, which will not be repeated here.

[0076] The utility model also provides a knife wheel cutting machine, comprising the height measuring detection circuit as described above.

[0077] It is worth noting that since the knife wheel cutting machine of the utility model is based on the above-mentioned height measurement detection circuit, the embodiments of the knife wheel cutting machine of the utility model include all technical solutions of all embodiments of the above-mentioned height measurement detection circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0078] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A height detection circuit, applied to a cutter wheel cutting machine, the cutter wheel cutting machine comprising a motor, characterized in that: The height detection circuit also includes: A contact height measurement circuit, the contact height measurement circuit is used to perform contact height measurement on the initial distance between the lowest point of the blade and the sheet carrier and output a corresponding contact height measurement signal; A non-contact height measurement circuit, which is used to perform non-contact height measurement on the initial distance between the lowest point of the blade and the sheet carrier and output a corresponding non-contact height measurement signal; a first switching circuit, wherein a first input end of the first switching circuit is electrically connected to an output end of the contact height measurement circuit, and a second input end of the first switching circuit is electrically connected to an output end of the non-contact height measurement circuit; A main control circuit, the main control circuit is electrically connected to the output end of the first switching circuit, the first switching circuit includes a signal receiving end, the main control circuit is electrically connected to the signal receiving end, and the main control circuit is used to control the first switching circuit to output the contact height measurement signal or the non-contact height measurement signal to the main control circuit; The main control circuit is also electrically connected to the motor, and is also used to control the motor to operate according to the contact height measurement signal or the non-contact height measurement signal.

2. The height detection circuit according to claim 1, characterized in that: The contact height measurement circuit comprises: A contact height measurement module, a first amplifier and a photocoupler circuit, wherein the output end of the contact height measurement module is electrically connected to the inverting end of the first amplifier, the non-inverting end of the first amplifier is grounded, the photocoupler circuit comprises a photodiode and a phototransistor, the power supply end of the first amplifier and the input end of the photodiode are both used to access a first voltage, the output end of the photodiode is electrically connected to the inverting end of the first amplifier, the input end of the phototransistor is electrically connected to the first input end of the switching circuit, and the output end of the phototransistor is grounded.

3. The height detection circuit according to claim 1, characterized in that: The first switching circuit comprises: A first relay circuit, wherein a first input end of the first relay circuit is electrically connected to an output end of the contact height measurement circuit, a second input end of the first relay circuit is electrically connected to an output end of the non-contact height measurement circuit, an output end of the first relay circuit is electrically connected to the main control circuit, and a controlled end of the first relay circuit is electrically connected to the main control circuit.

4. The height detection circuit according to claim 2, characterized in that: The contact height measurement circuit also includes: A second switching circuit, the third end of the second switching circuit is electrically connected to the contact height measurement circuit, the fifth end of the second switching circuit is grounded, the first end and the second end of the second switching circuit are both electrically connected to the inverting end of the first amplifier, the fifth end and the sixth end of the second switching circuit are both electrically connected to the non-inverting end of the first amplifier, and when the second switching circuit is triggered, its first end is electrically connected to the third end and the sixth end is electrically connected to the fourth end, or its fifth end is electrically connected to the third end and the second end is electrically connected to the fourth end.

5. The height detection circuit according to claim 1, characterized in that: The height detection circuit also includes: A carbon brush detection circuit and an alarm module, wherein the output ends of the alarm module and the carbon brush detection circuit are electrically connected to the main control circuit, and the carbon brush detection circuit is used to detect the degree of wear of the main shaft carbon brush of the motor and output a corresponding carbon brush detection signal. When the carbon brush detection signal is not within a preset threshold range, the main control circuit controls the alarm module to operate.

6. The height detection circuit according to claim 5, characterized in that: The carbon brush detection circuit comprises: A carbon brush detection module, a second relay circuit and a third relay circuit, the carbon brush detection module is used to output the carbon brush detection signal, the input end of the second relay circuit is electrically connected to the output end of the carbon brush detection module, the first output end of the second relay circuit is electrically connected to the main control circuit, the second output end of the second relay circuit is grounded, and the controlled end of the second relay circuit is electrically connected to the main control circuit; the input end of the third relay circuit is electrically connected to the output end of the contact height measurement circuit, the first output end of the third relay circuit is suspended, the second output end of the third relay circuit is electrically connected to the main control circuit, and the controlled end of the third relay circuit is electrically connected to the controlled end of the second relay circuit, and the main control circuit is used to control the second relay circuit to output the carbon brush detection signal to the main control circuit or ground.

7. The height detection circuit according to claim 2, characterized in that: The height detection circuit also includes: A first power supply circuit and a second power supply circuit, wherein the first power supply circuit is electrically connected to the power supply end of the contact height measurement module, the input end of the photodiode and the power supply end of the first amplifier respectively, and the second power supply circuit is electrically connected to the power supply end of the non-contact height measurement circuit and the power supply end of the first switching circuit respectively.

8. The height detection circuit according to claim 7, characterized in that: The height detection circuit also includes: A first ground terminal and a second ground terminal, the first power supply circuit, the contact height measurement module, and the first amplifier are all connected to the first ground terminal, and the second power supply circuit, the photocoupler circuit, and the non-contact height measurement circuit are all connected to the second ground terminal.

9. A knife wheel cutting machine, characterized in that: It comprises a motor and a height detection circuit as described in any one of claims 1 to 8.

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