阅读说明：本技术 锯床控制器 (Sawing machine controller ) 是由 王丹 杨建洲 乔健 黄耀辉 于 2021-09-02 设计创作，主要内容包括：本发明涉及一种锯床控制器,具体是一种金属带锯床控制电路。本发明采用的技术方案是：锯床控制器,包括开关电源模块、主电机继电器、冷却电机继电器、微控制单元和按键指示灯电路；开关电源模块连接于交流电源,开关电源模块将交流电转化为直流电,开关电源模块的直流输出端接入主电机继电器、冷却电机继电器和微控制单元；主电机继电器设置在主电机的供电电源线中,主电机继电器设有信号输入端,主电机继电器的信号输入端接收到信号线路传来的启动或关闭信号后,接通或断开主电机的供电电源线。(The invention relates to a sawing machine controller, in particular to a control circuit of a metal band sawing machine. The technical scheme adopted by the invention is as follows: the sawing machine controller comprises a switching power supply module, a main motor relay, a cooling motor relay, a micro control unit and a key indicator lamp circuit; the switching power supply module is connected to an alternating current power supply, the switching power supply module converts alternating current into direct current, and the direct current output end of the switching power supply module is connected to the main motor relay, the cooling motor relay and the micro control unit; the main motor relay is arranged in a power supply line of the main motor, the main motor relay is provided with a signal input end, and the signal input end of the main motor relay is used for switching on or switching off the power supply line of the main motor after receiving a starting or closing signal transmitted by a signal line.)

1. A sawing machine controller is characterized by comprising a switching power supply module, a main motor relay, a cooling motor relay, a micro control unit and a key indicator lamp circuit;

the switching power supply module is connected to an alternating current power supply, the switching power supply module converts alternating current into direct current, and the direct current output end of the switching power supply module is connected to the main motor relay, the cooling motor relay and the micro control unit;

the main motor relay is arranged in a power supply line of the main motor, the main motor relay is provided with a signal input end, and the signal input end of the main motor relay is used for switching on or switching off the power supply line of the main motor after receiving a starting or closing signal transmitted by a signal line;

the cooling motor relay is arranged in a power supply line of the cooling motor, a signal line of the cooling motor relay is connected to the output end of the micro control unit, and a signal input end of the cooling motor relay is connected or disconnected with the power supply line of the cooling motor after receiving a starting or closing signal transmitted by the signal line; the micro control unit is provided with a signal input end and a signal output end, the signal input end is connected with the key indicating lamp circuit, and the signal output end is connected with the main motor relay and the cooling motor relay through signal lines.

2. The sawing machine controller according to claim 1, wherein an EMC anti-jamming circuit is provided at the front end of the switching power supply module, the main motor relay and the cooling motor relay, the EMC anti-jamming circuit is connected to the three-phase input terminal, a voltage dependent resistor, a Y capacitor and an X capacitor are provided inside, the voltage dependent resistor eliminates a peak voltage, and the Y capacitor and the X capacitor filter the system pulse interference.

3. The sawing machine controller according to claim 1, further comprising a current sampling circuit, wherein an input end of the current sampling circuit is connected to the alternating current, an output end of the current sampling circuit is connected to the micro control unit, a current transformer and a shaping filter component are arranged in the current sampling circuit, the alternating current collected by the current transformer generates an induced current signal, the induced current signal is input to the shaping filter component, the induced current signal is converted into a voltage signal after shaping filtering, the voltage signal is input to the micro control unit, a current value is calculated in the micro control unit and is compared with an internal set value in the micro control unit to determine whether the current value is over-current, and if the current value is over-current for 10 seconds, the micro control unit sends a main motor stop signal to the main motor relay.

4. The controller for the sawing machine according to claim 1, wherein the key indicator light circuit is provided with a plurality of button inputs including a main motor running button, a main motor stop button, a cooling motor running button and an emergency stop button and a plurality of feedback signal indicator lights, the buttons being respectively connected to the input terminals of the micro control unit; the feedback signal indicator lamps are multiple and are respectively connected to the output end of the micro control unit.

5. The controller of claim 4, wherein the feedback signal indicator lights are at least four groups, including a main motor operation indicator light D1, a main motor operation indicator light D3, a cooling motor operation indicator light D4, a cooling motor operation indicator light D5, a main motor operation indicator light D1, a main motor operation indicator light D3, a cooling motor operation indicator light D4 and a cooling motor operation indicator light D5, which are connected in parallel, wherein the anode is connected to the output terminal of the micro control unit, the main motor operation button, the main motor stop button and the cooling motor operation button are connected in parallel, and the cathode terminal of the indicator light connected in parallel is connected to the buttons connected in parallel.

6. The controller of claim 1, wherein the power module circuit is provided with an AC380V AC to DC24V conversion module and a DC24V to DC DC3.3V conversion module, and the DC3.3V module supplies power to the micro control unit, the keys and the indicator light.

7. The saw machine controller as claimed in claim 1, wherein the cooling motor relay is an intermediate relay, a driving circuit is provided between the cooling motor relay and the micro control unit, the driving circuit comprises a resistor R6, an indicator lamp D3 and a base B of an NPN transistor Q2 which are connected in series with an output end of the micro control unit, a C collector of the NPN transistor Q2 is connected in parallel with the indicator lamp D2 and the intermediate relay and then connected to a positive terminal of a direct current 24V, and a base B of the NPN transistor Q2 is connected with a resistor 7 and then connected to an emitter E of the NPN transistor Q2 and grounded.

8. The sawing machine controller of claim 1, wherein the main motor relay is a solid state relay, the three AC380V are respectively connected to the power input ends of the solid state relay, the power output end of the solid state relay is connected to the main motor, the signal input end of the solid state relay is connected to the C collector of an NPN triode Q1, the B base of the NPN triode Q1 is connected in series with an indicator lamp D1 and a resistor R4 and then connected to the output end of the microcontroller, and the E emitter of the NPN triode Q1 and the B base of the NPN triode Q5 are simultaneously grounded.

Technical Field

The invention relates to a sawing machine controller, in particular to a control circuit of a metal band sawing machine.

Background

The traditional sawing machine industry controller is designed by adopting a control cabinet mode and utilizing control devices such as an air switch, an alternating current contactor, a thermal overload relay, an intermediate relay, an alternating current transformer, an electrical switch, an indicator light and the like. The main realization is to operations such as sawing machine motor start-stop control, positive and negative switching control, and air switch mainly is protection input power under abnormal conditions, and ac contactor control three phase current break-make stops motor and positive and negative switching motor control, and thermal overload relay protection motor is transshipped or is overflowing, auxiliary relay, ac transformer, electric switch, pilot lamp etc. are supplementary to ac contactor and motor's control.

The traditional sawing machine has a plurality of defects, the design mode of adopting the control cabinet occupies large volume, the circuit wiring is complex, the possibility of misconnection is high, and the time and the difficulty of debugging and testing are increased; the alternating current contactor and the electrical switch are mechanically closed and opened, noise and electric sparks are easy to generate, the thermal overload relay has poor repeated working performance, can not be reused after large-current overload or short-circuit fault occurs, and has the problems of large adjustment error, easy influence and misoperation caused by environmental temperature and the like.

Disclosure of Invention

The invention provides a sawing machine controller, which solves the problems of large volume, complex circuit and high use failure rate of the original controller.

In order to achieve the purpose, the invention adopts the technical scheme that: the sawing machine controller comprises a switching power supply module, a main motor relay, a cooling motor relay, a micro control unit and a key indicator lamp circuit;

the switching power supply module is connected to an alternating current power supply, the switching power supply module converts alternating current into direct current, and the direct current output end of the switching power supply module is connected to the main motor relay, the cooling motor relay and the micro control unit;

the main motor relay is arranged in a power supply line of the main motor, the main motor relay is provided with a signal input end, and the signal input end of the main motor relay is used for switching on or switching off the power supply line of the main motor after receiving a starting or closing signal transmitted by a signal line;

the cooling motor relay is arranged in a power supply line of the cooling motor, a signal line of the cooling motor relay is connected to the output end of the micro control unit, and a signal input end of the cooling motor relay is connected or disconnected with the power supply line of the cooling motor after receiving a starting or closing signal transmitted by the signal line; the micro control unit is provided with a signal input end and a signal output end, the signal input end is connected with the key indicating lamp circuit, and the signal output end is connected with the main motor relay and the cooling motor relay through signal lines.

Preferably, an EMC anti-interference circuit is arranged at the front ends of the switching power supply module, the main motor relay and the cooling motor relay, the EMC anti-interference circuit is connected with the three-phase input end, a piezoresistor, a Y capacitor and an X capacitor are arranged in the EMC anti-interference circuit, the piezoresistor eliminates peak voltage, and the Y capacitor and the X capacitor filter system pulse interference.

Preferably, the current sampling circuit is further arranged, the input end of the current sampling circuit is connected into alternating current, the output end of the current sampling circuit is connected into the micro control unit, a current transformer and a shaping filtering component are arranged in the current sampling circuit, alternating current collected by the current transformer generates an induced current signal and is input into the shaping filtering component, the induced current signal is converted into a voltage signal after shaping filtering, the voltage signal is input into the micro control unit, the micro control unit calculates the current value and compares the current value with an internal set value in the micro control unit to judge whether overcurrent exists or not, and if the overcurrent state lasts for 10 seconds, the overcurrent state is the overcurrent state, the micro control unit sends a main motor stop signal to the main motor relay.

Preferably, the key indicator light circuit is provided with a plurality of button inputs and a plurality of feedback signal indicator lights, the button input inputs comprise a main motor running button, a main motor stop button, a cooling motor running button and an emergency stop button, and the buttons are respectively connected to the input end of the micro control unit; the feedback signal indicator lamps are multiple and are respectively connected to the output end of the micro control unit.

Preferably, the feedback signal indicator lamps are at least four groups and comprise a main motor operation indicator lamp D1, a main motor operation indicator lamp D3, a cooling motor operation indicator lamp D4 and a cooling motor operation indicator lamp D5, a main motor operation indicator lamp D1, a main motor operation indicator lamp D3, a cooling motor operation indicator lamp D4 and a cooling motor operation indicator lamp D5 which are connected in parallel, the anode is connected to the output end of the micro control unit, the main motor operation button, the main motor stop button and the cooling motor operation button are connected in parallel, and the cathode end of the indicator lamp after being connected in parallel is connected to the buttons which are connected in parallel.

Preferably, an AC380V AC-to-DC 24V conversion module and a DC24V conversion DC3.3V module are arranged in the power module circuit, and the DC3.3V module supplies power for the micro-control unit, the keys and the indicator light.

Preferably, the cooling motor relay is an intermediate relay, a driving circuit is arranged between the cooling motor relay and the micro control unit, the driving circuit comprises a resistor R6 connected in series with the output end of the micro control unit, an indicator lamp D3 and a base B of an NPN triode Q2, a collector C of the NPN triode Q2 is connected with the indicator lamp D2 and the intermediate relay in parallel and then is connected to the positive pole of direct current 24V, and a base B of the NPN triode Q2 is connected with a resistor 7 and then is grounded with an emitter E of the NPN triode Q2.

Preferably, the main motor relay is a solid-state relay, the three AC380V poles are respectively connected to the power input end of the solid-state relay, the power output end of the solid-state relay is connected to the main motor, the signal input end of the solid-state relay is connected to the C collector of an NPN triode Q1, the B base of the NPN triode Q1 is connected in series with an indicator lamp D1 and a resistor R4 and then connected to the output end of the microcontroller, and the E emitter of the NPN triode Q1 and the B base of the NPN triode Q5 are connected in series with a resistor R5 and then grounded simultaneously.

The sawing machine controller has the advantages of simple structure, low noise in the middle of use, small structural size, high control response speed, in-place protection of an internal circuit, and safe and reliable performance.

The overcurrent signal can be quickly responded under the condition of abnormal large current, the motor driving signal can be blocked in time, a better protection effect can be achieved, the problems that a sawing machine controller in the prior industry is large in size, complex in wiring and the like are effectively solved, and the product quality is improved.

The invention adopts the combination of the integrated circuit board and the plastic shell to change the original AC contactor occupying large space into a solid-state relay, the heat overload relay into a current transformer, the AC transformer into a switch power supply module, and the electric switch and the indicator light into a control circuit consisting of an MCU and a low-voltage electronic component, and then the control circuit and the MCU are integrated on the circuit board together. The circuit board is arranged in the plastic shell, the operation interface is arranged on the surface of the plastic shell, and the contact buttons and the indicator lamps on the circuit board are used for operation. The operation and maintainability are obviously improved.

Drawings

Figure 1 is a circuit connection diagram of the controller of the present invention,

figure 2 is a switching power supply module circuit AC380V AC to DC24V module in the controller of the present invention,

figure 3 is a switching power supply module circuit DC24V switching DC3.3V module in the controller of the present invention,

figure 4 is a diagram of the connection between the main motor relay and the drive circuit in the controller of the present invention,

figure 5 is a connection diagram of a driving circuit in an intermediate relay in the controller of the present invention,

figure 6 is a current sampling circuit in the controller of the present invention,

figure 7 is a key indicator light circuit in the controller of the present invention,

fig. 8 is a wiring diagram of a micro control unit in the controller of the present invention.

Detailed Description

The following further describes the specific contents of the present invention:

the invention relates to a sawing machine controller, in particular to a circuit control device based on a micro control unit design.

The controller structure of the invention is shown in figure 1, and comprises a switch power supply module, a main motor relay, a cooling motor relay, a micro control unit, a current sampling circuit and a key indicator light circuit;

the connection relationship of the circuit modules is explained, as shown in fig. 1, the switching power supply module is connected to an alternating current power supply, the switching power supply module converts alternating current into direct current, and a direct current output end of the switching power supply module is connected to the main motor relay, the cooling motor relay and the micro control unit.

The main motor relay is arranged in a power supply line of the main motor, the main motor relay is provided with a signal input end, and the signal input end of the main motor relay is used for switching on or switching off the power supply line of the main motor after receiving a starting or closing signal transmitted by a signal line.

The cooling motor relay is arranged in a power supply line of the cooling motor, a signal line of the cooling motor relay is connected to the output end of the micro control unit, and a signal input end of the cooling motor relay is connected or disconnected with the power supply line of the cooling motor after receiving a starting or closing signal transmitted by the signal line; the micro control unit is provided with a signal input end and a signal output end, the signal input end is connected with the key indicating lamp circuit, and the signal output end is connected with the main motor relay and the cooling motor relay through signal lines.

Except above-mentioned circuit mode module, be equipped with the EMC anti jamming circuit at switching power supply module, main motor relay and cooling motor relay's front end, the EMC anti jamming circuit connects the three-phase input, and inside is equipped with piezo-resistor, Y electric capacity and X electric capacity, and the piezo-resistor eliminates peak voltage, and Y electric capacity and X electric capacity filter system impulse interference, and solid-state relay and switching power supply module are inside respectively from taking EMC anti jamming circuit.

In order to input control information to the controller and obtain the operation feedback state of the motor controlled by the controller, a key indicator lamp circuit is provided, as shown in fig. 7, the key indicator lamp circuit is provided with a plurality of button inputs and a plurality of feedback signal indicator lamps, the button input inputs comprise a main motor operation button, a main motor stop button, a cooling motor operation button and an emergency stop button, and the buttons are respectively connected to the input end of the micro control unit; the feedback signal indicator lamps are multiple and are respectively connected to the output end of the micro control unit.

The feedback signal indicator lamps are multiple and comprise a main motor operation indicator lamp D1, a main motor operation indicator lamp D3, a cooling motor operation indicator lamp D4, a cooling motor operation indicator lamp D5, a main motor operation indicator lamp D1, a main motor operation indicator lamp D3, a cooling motor operation indicator lamp D4 and a cooling motor operation indicator lamp D5 which are connected in parallel, the anode is connected to the output end of the micro control unit, the main motor operation button, the main motor stop button and the cooling motor operation button are connected in parallel, and the cathode end of the indicator lamp connected in parallel is connected to the buttons connected in parallel.

In the scram control, when a panel scram button is pressed, as shown in fig. 7, a JT signal is changed into a low level, a JJTT signal is changed into a low level, the JJTT signal is input into an IO port of a micro control unit to generate a scram signal, the system is stopped, and an indicator lamp D6 flickers at a low speed; when the panel emergency stop button is restored, the JT signal is changed into high level, the JJTT signal is changed into high level, and the JJTT signal is input into the IO port of the micro control unit to restore the normal working state.

The electric saw is controlled by a main motor, and when the main motor is pressed to operate by a main motor operation button as shown in fig. 7, an indicator lamp D1 is turned on, and an indicator lamp D3 is turned off; when the main motor stop button is pressed to stop the main motor, the indicator lamp D3 is on, and the indicator lamp D1 is off; when the cooling motor operation button is pressed to operate the cooling motor, the indicator lamp D4 is on, and the indicator lamp D5 is off; when the cooling motor running button is pressed again to run the cooling motor, the indicator lamp D5 is on, and the indicator lamp D4 is off; when the panel scram key is pressed, the indicator lights D3 and D5 blink slowly; when the overcurrent signal is generated, the indicator lamps D3 and D5 flash rapidly.

The detailed description will be given for each circuit block,

as for the switching power supply module shown in fig. 2 and 3, the conventional voltage used in a factory is ac380V or 220V mains supply, and the components in the control circuit are dc low voltage, so that it is necessary to transform the ac power used in the factory into high voltage and low voltage. An AC380V AC-to-DC 24V conversion module and a DC24V conversion DC3.3V module are arranged in the power module circuit.

As shown in FIG. 2, AC380V is converted into rated input voltage AC380V of the DC24V conversion module, the input voltage range is AC 85-500V, and the output voltage DC24V is obtained. DC24V is used for solid state relays, intermediate relays, and peripheral switches.

As shown in fig. 3, the DC24V conversion DC3.3V module uses XL1509-3.3V power supply voltage reduction chip to convert into DC3.3V for micro control unit, key, indicator light, etc.

The start control circuit of the main motor and the cooling motor of the sawing machine will be described, and the structure of the relay and the driving circuit of the cooling motor is shown in fig. 5. The cooling motor relay is an intermediate relay, a driving circuit is arranged between the cooling motor relay and the micro control unit, the driving circuit comprises a resistor R6, an indicator lamp D3 and a B base electrode of an NPN triode Q2, the C collector electrode of the NPN triode Q2 is connected with the indicator lamp D2 and the intermediate relay in parallel and then is connected with the positive electrode of direct current 24V, and the B base electrode of the NPN triode Q2 is connected with a resistor 7 and then is grounded with an E emitter electrode of the NPN triode Q2.

As shown in fig. 4, the main motor relay is a solid state relay, three AC380V are respectively connected to the power input end of the solid state relay, the power output end of the solid state relay is connected to the main motor, the signal input end of the solid state relay is connected to the C collector of an NPN triode Q1, the B base of the NPN triode Q1 is connected in series with an indicator lamp D1 and a resistor R4 and then connected to the output end of the microcontroller, and the emitter E of the NPN triode Q1 and the base B are connected in series with a resistor R5 and then grounded.

As shown in fig. 4, when the main motor operation button is pressed, the RS pin of the micro control unit generates a high level signal, and the NPN transistor Q1 is turned on through the diode D1 to trigger the solid-state relay to be turned on, so that the main motor operates; when the main motor stop button presses the RS pin of the micro control unit to recover the low level signal, the NPN triode Q1 is cut off through the diode D1, the solid state relay recovers the off state, and the main motor stops.

In order to avoid a fault caused by overcurrent of a main motor, a current sampling circuit is arranged, as shown in fig. 6, the input end of the current sampling circuit is connected into alternating current, the output end of the current sampling circuit is connected into a micro control unit, a current transformer and a shaping filter component are arranged in the current sampling circuit, the alternating current collected by the current transformer generates an induced current signal and is input into the shaping filter component, the induced current signal is converted into a voltage signal after shaping filtering, the voltage signal is input into the micro control unit, the current value is calculated in the micro control unit and is compared with an internal set value in the micro control unit to judge whether overcurrent exists, and if the current value lasts for 10 seconds and is in an overcurrent state, the current signal is the overcurrent, and the micro control unit sends a main motor stop signal to a main motor relay.

The input and output pins of the micro control unit are shown in fig. 8, the micro control unit is connected with the circuit modules through the input and output pins, and processes the key input signal and outputs the processed key input signal to the driving circuit, so that the purpose of controlling the main motor and cooling the motor of the motor is achieved.

The embodiment of the invention has the advantages of simple structure, low noise, small volume, quick response, safety and reliability, can quickly respond to an overcurrent signal under the condition of abnormal large current, blocks a motor driving signal in time, plays a better protection role, effectively solves the problems of large volume, complex wiring and the like in the prior industry, and ensures the product quality.