CN216904717U - Frequency conversion control circuit of section steel cold bending machine - Google Patents
Frequency conversion control circuit of section steel cold bending machine Download PDFInfo
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- CN216904717U CN216904717U CN202220021502.2U CN202220021502U CN216904717U CN 216904717 U CN216904717 U CN 216904717U CN 202220021502 U CN202220021502 U CN 202220021502U CN 216904717 U CN216904717 U CN 216904717U
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Abstract
The utility model relates to the technical field of section steel cold bending machines, in particular to a frequency conversion control circuit of a section steel cold bending machine, which comprises a forward rotation starting switch, a reverse rotation starting switch and a main motor, wherein the forward rotation starting switch and the reverse rotation starting switch are used for controlling the forward rotation or the reverse rotation of the main motor; the input end of the frequency converter is connected with the output end of the PLC controller, the frequency converter outputs or stops outputting the alternating current with changed frequency to the variable frequency motor according to the forward rotation starting control signal or the reverse rotation starting control signal, and the variable frequency motor is used for controlling the running of the speed reducer; and the analog input end of the frequency converter is connected with a rotating speed adjusting potentiometer, and the rotating speed adjusting potentiometer is used for adjusting the frequency of the alternating current output by the frequency converter. The circuit is used for realizing the frequency conversion control of the section steel cold bending machine.
Description
Technical Field
The utility model relates to the technical field of section steel cold bending machines, in particular to a frequency conversion control circuit of a section steel cold bending machine.
Background
A cold bending machine, also called an arch bending machine, is mainly applied to bending of sectional materials such as I-shaped steel, channel steel angle steel U-shaped steel and the like of tunnels, subways, hydropower stations, underground caverns and the like. The cold bending machine is a new type of equipment for processing and manufacturing tunnel supporting steel arch frame. The cold bending device comprises a base, a mechanical transmission part, a cold bending system, a hydraulic system, an electrical appliance control system, an auxiliary system and the like.
The control schematic diagram of a common cold bending machine is shown in fig. 1, a main cold bending working motor is two 4KW common asynchronous motors, an oil pump motor is a small asynchronous motor with about 2KW, and firstly, a QF1-QF5 circuit breaker is started to connect power supplies of all levels of control mechanisms. Then, a forward rotation button or a reverse rotation button is pressed, and the main motors M1 and M2 are started to drive the corresponding speed reducers to operate. Then, an oil pump starting button is pressed, an oil pump motor operates (the rotation direction of the oil pump motor needs to be noticed during the first operation, so that the oil pump is prevented from idling), and at the moment, an oil cylinder extending or retracting button can be pressed according to the working requirement to control the working oil cylinder to work. In addition, in the aspect of overload control, current overload thermal relays are arranged on three motor circuits for protection, and the oil cylinder is also provided with two limit controls, so that the normal operation of equipment can be ensured.
The control principle of the above-mentioned ordinary cold bending machine in the prior art has the disadvantage that this type of steel bending machine can cause the following problems because the main motor is directly started by two asynchronous motors: 1. the working current is larger at the moment of starting, and the energy consumption loss is larger. 2. The rotating speed of the motor can reach the rated speed quickly, and the requirement on the proficiency level of the operation of workers is high; the safety guarantee requirement of operators is high, and 3, the machining precision of certain workpieces is difficult to meet the requirement.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: aiming at the problems caused by the direct starting of two asynchronous motors of a main motor, the method changes the method that the starting and the stopping of the two motors are controlled simultaneously by a frequency converter and a PLC, and the two motors have the same rotating speed, thereby disclosing a frequency conversion control circuit and providing the frequency conversion control circuit of the section steel cold bending machine.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a frequency conversion control circuit of a section steel cold bending machine comprises a forward rotation starting switch, a reverse rotation starting switch, a main motor, a PLC controller and a frequency converter, wherein the forward rotation starting switch and the reverse rotation starting switch are used for controlling the forward rotation or the reverse rotation of the main motor,
the input end of the PLC controller is respectively connected with the forward rotation starting switch and the reverse rotation starting switch and is used for outputting a forward rotation starting control signal or a reverse rotation starting control signal to the frequency converter according to the state of the forward rotation starting switch or the reverse rotation starting switch;
the input end of the frequency converter is connected with the output end of the PLC controller, the output end of the frequency converter is connected with the variable frequency motor, the frequency converter is used for outputting or stopping outputting the alternating current with the changed frequency to the variable frequency motor according to the forward rotation starting control signal or the reverse rotation starting control signal,
the variable frequency motor is used for controlling the speed reducer to operate;
and the analog input end of the frequency converter is connected with a rotating speed adjusting potentiometer, and the rotating speed adjusting potentiometer is used for adjusting the frequency of the alternating current output by the frequency converter.
The start and stop of the variable frequency motor are controlled by the PLC and the frequency converter, the frequency of the alternating current output by the PLC can be adjusted by setting the resistance value (for example, the resistance value is adjustable by 0-10K omega) of the rotating speed adjusting potentiometer, so that the variable frequency motor is controlled to operate according to the corresponding rotating speed, and the rotating speed of the motor can be adjusted.
Preferably, the main motor comprises a first inverter main motor and a second inverter main motor, and the inverter comprises a first inverter and a second inverter,
the forward rotation starting control signal or the reverse rotation starting control signal is output to the first frequency converter and the second frequency converter in parallel, the first frequency converter outputs or stops outputting alternating current to the first frequency conversion main motor, and the second frequency converter outputs or stops outputting alternating current to the second frequency conversion main motor,
the analog input port of the first frequency converter is connected with a potentiometer W1, and the potentiometer W1 is used for setting the frequency of the alternating current output by the first frequency converter;
and the analog output port of the first frequency converter is connected with the analog input port of the second frequency converter, and the analog output port of the first frequency converter is used for outputting a speed given signal to the analog input port of the second frequency converter.
Because the analog output port of the first frequency converter is connected with the analog input port of the second frequency converter, the frequency of the output alternating current set by the second frequency converter is the same as the frequency of the output alternating current of the first frequency converter, the same starting switch is realized, and the two motors are controlled to operate at the same rotating speed.
As a preferred scheme, one end of the forward starting switch and one end of the reverse starting switch are connected with 24V direct-current voltage, the other end of the forward starting switch and the other end of the reverse starting switch are connected to the PLC controller through different ports, signals at the input end of the PLC are switched between 24V and 0V through the on and off of the switches, and state signals are obvious.
Preferably, the first frequency converter and the second frequency converter are in a model of JL-V81VV43040L, ends R, S and T of the first frequency converter and the second frequency converter are respectively connected with three phase lines of a three-phase power supply, and ends U, V and W of the first frequency converter and the second frequency converter are respectively connected with a first frequency conversion main motor and a second frequency conversion main motor.
As a preferred scheme, the radiating device further comprises a first variable-frequency main motor radiating fan, a second variable-frequency main motor radiating fan and a control cabinet radiating fan, wherein power input ends of the first variable-frequency main motor radiating fan, the second variable-frequency main motor radiating fan and the control cabinet radiating fan are respectively connected with three phase lines of a three-phase power supply, the first variable-frequency main motor radiating fan and the second variable-frequency main motor radiating fan are respectively used for radiating heat for the first variable-frequency main motor and the second variable-frequency main motor, and the control cabinet radiating fan is used for radiating heat for a control cabinet box.
Preferably, the system further comprises a three-phase filter, wherein the three-phase filter is connected to a phase line of a three-phase power supply in parallel and is used for reducing interference of the frequency converter on a power grid.
As a preferred scheme, an oil pump starting switch and an oil pump stopping switch are further connected to the input end of the PLC controller, one ends of the oil pump starting switch and the oil pump stopping switch are connected to a 24V direct-current voltage, and the other ends of the oil pump starting switch and the oil pump stopping switch are connected to an input interface of the PLC controller; one output end of the PLC is connected to a 0V power supply through a relay KR2, the relay KR2 is connected with a coil KM2 of the oil pump control contactor in series and then bridged at two ends of 220V alternating-current voltage, and a coil KM2 of the oil pump control contactor is used for controlling the starting and stopping of the oil pump.
The coil of a relay KR2 is controlled by the output end of a PLC controller to control a KM2 contactor to control the starting and stopping of an oil pump.
Preferably, the system further comprises a phase sequence relay, wherein three input ports of the phase sequence relay are respectively connected to phase lines of a three-phase power supply, the phase sequence relay is used for controlling the on-off of 24V direct-current voltage and preventing the oil pump motor from reversely rotating when the main power supply is connected.
As a preferred scheme, the input end of the PLC controller is further connected to an oil cylinder extension switch and an oil cylinder retraction switch, one end of the oil cylinder extension switch and one end of the oil cylinder retraction switch are connected to a 24V direct current voltage, and the other end of the oil pump starting switch and the other end of the oil pump stopping switch are connected to an input interface of the PLC controller; one output end of the PLC is connected to a 0V power supply through a relay KR3 and used for outputting a cylinder extending control signal, one output end of the PLC is connected to the 0V power supply through a relay KR4 and used for outputting a cylinder retracting control signal,
an indicator lamp H3, a freewheeling diode D1 and a solenoid valve SL1 are connected in parallel and then are connected in series with a normally open contact of a relay KR3 to form an oil cylinder extension control branch, and the oil cylinder extension control branch is connected between 0V and 24V; an indicator lamp H4, a freewheeling diode D2 and a solenoid valve SL2 are connected in parallel and then connected in series with a normally open contact of the relay KR4 electric appliance to form a cylinder retraction control branch, and the cylinder retraction control branch is connected between 0V and 24V.
As a preferable scheme, the device also comprises a hydraulic and displacement stroke monitoring circuit, wherein the hydraulic and displacement stroke monitoring circuit comprises an oil pressure sensor, a displacement stroke sensor, a direct current signal isolator and an analog quantity input module,
the oil pressure sensor and the displacement travel sensor are respectively connected with the input end of the direct current signal isolator and used for outputting the collected oil pressure analog signal and the collected displacement analog signal to the analog quantity input module through the direct current signal isolator;
the analog quantity input module converts the oil pressure analog signal and the displacement analog signal into an oil pressure digital signal and a displacement digital signal, and the oil pressure digital signal and the displacement digital signal are used for displaying the pressure of the oil cylinder and the stroke of the oil cylinder.
In conclusion, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
1. the frequency conversion control circuit of the utility model is adopted to realize the frequency conversion control of the section steel cold bending machine, the speed of the section steel cold bending machine is adjustable, the operation is safe, and the working motor saves energy. 2. The two motors can be synchronously controlled to start or stop simultaneously through a start or stop button. 3. The flexible length of working cylinder passes back data through the sensor, through touch-sensitive screen digital display, and is directly perceived convenient. 4. And the phase sequence circuit control is added to prevent the hydraulic pump from being damaged due to phase sequence errors.
Drawings
FIG. 1 is a control schematic diagram of a conventional cold bending machine;
fig. 2 is an overall structural diagram of a frequency conversion control circuit of a section steel bending machine according to embodiment 1 of the present invention;
fig. 3 is a connection relationship diagram of a phase-sequence relay, a radiator fan of a frequency converter, and a three-phase filter in embodiment 1 of the present invention;
FIG. 4 is a diagram showing a connection relationship between a frequency converter and a variable frequency motor in embodiment 1 of the present invention;
FIG. 5 is a connection circuit diagram for start and stop control of the oil pump in embodiment 1 of the present invention;
fig. 6 is a connection diagram of peripheral circuits of a PLC controller in embodiment 1 of the present invention;
fig. 7 is a circuit diagram for monitoring hydraulic pressure and cylinder displacement stroke in embodiment 1 of the present invention.
Fig. 8 is a connection diagram of an IT6070T touch panel using the jungle in embodiment 1 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Example 1
The utility model provides a shaped steel forming mill's frequency conversion control circuit, the whole framework of circuit is shown as figure 2, includes corotation starting switch, reversal starting switch, main motor, and corotation starting switch, reversal starting switch are used for controlling main motor corotation or reversal, still includes PLC controller, converter to main motor is inverter motor.
The input end of the PLC controller is respectively connected with the forward starting switch and the reverse starting switch and is used for outputting a forward starting control signal or a reverse starting control signal to the frequency converter according to the state of the forward starting switch or the reverse starting switch; the input end of the frequency converter is connected with the output end of the PLC, the output end of the frequency converter is connected with the variable frequency motor, the frequency converter is used for outputting or stopping outputting alternating current to the variable frequency motor according to a forward rotation starting control signal or a reverse rotation starting control signal, and the variable frequency motor is used for controlling the running of the speed reducer; and the analog input end of the frequency converter is connected with a rotating speed adjusting potentiometer, and the rotating speed adjusting potentiometer is used for adjusting the frequency of the alternating current output by the frequency converter.
As a specific example, fig. 6 shows a connection relationship diagram of a peripheral circuit of a PLC controller as a control device, and fig. 4 shows a connection relationship diagram of a frequency converter and a variable frequency motor. It can be seen from fig. 4 and 6 that the main motors comprise a first inverter main motor M1 and a second inverter main motor M2, and that the inverters comprise a first inverter and a second inverter,
the forward rotation starting control signal is transmitted to a forward rotation starting input port of the first frequency converter through a No. 14 line connected by the PLC; the forward rotation starting control signal is transmitted to a forward rotation starting input port of the second frequency converter through a No. 15 wire connected by the PLC; the reverse starting control signal is transmitted to a reverse starting input port of the first frequency converter through a 16-number line connected by the PLC; and the reverse rotation starting control signal is transmitted to a reverse rotation starting input port of the second frequency converter through a No. 17 wire connected out by the PLC. The fault reset ports of the first frequency converter and the second frequency converter are also connected to a No. 13 line of the PLC controller in parallel.
The analog output port of the first frequency converter is connected with the analog input port of the second frequency converter, the analog output port of the first frequency converter is used for outputting a speed given signal to the analog input port of the second frequency converter, and because the precision requirement is not high, the motor rotating speed signal of the first frequency converter is output (AO1, GND) through an analog quantity terminal and is used as the speed given (AI1, GND) of the motor of the second frequency converter, so that the running speeds of the two frequency converter motors are ensured to be consistent.
The analog signal input end of the first frequency converter is connected with a rotating speed adjusting potentiometer W1, W1(10K omega) as the speed setting of the first frequency converter controller.
Further, in fig. 6, one end of the forward start switch SB6 and one end of the reverse start switch SB7 are connected to a 24V dc voltage, the other end of the forward start switch SB6 is connected to the PLC controller via the No. 3 line of the PLC controller, and the other end of the reverse start switch SB7 is connected to the PLC controller via the No. 4 line of the PLC controller.
Further, as shown in fig. 4, the first frequency converter and the second frequency converter are of the type JL-V81VV43040L, the R terminal, the S terminal and the T terminal of the first frequency converter and the second frequency converter are respectively connected with three phase lines (L11, L22, L33) of a three-phase power supply, and the U terminal, the V terminal and the W terminal of the first frequency converter and the second frequency converter are respectively connected with the first frequency converter main motor M1 and the second frequency converter main motor M2.
Due to the use of the PLC, after the forward rotation starting switch SB6 is closed, the 24V high level is input to the 3 rd port of the PLC, the 24V high level is output by the 14 th and 15 th lines of the PLC, the 24V high level output by the 14 th and 15 th lines simultaneously controls and starts the first frequency converter and the second frequency converter to rotate forward, and the first frequency conversion main motor M1 and the second frequency conversion main motor M2 are simultaneously started. The concept of controlling two motors simultaneously through one switch is realized.
Fig. 3 is a connection relationship diagram of the phase sequence relay, the frequency converter cooling fan and the three-phase filter, as shown in fig. 3, the circuit further includes a control cabinet cooling fan and a variable frequency motor cooling fan, a power input end of the cooling fan is respectively connected with phase lines of a three-phase power supply, and the cooling fan operates according to a power start control signal and is used for forced heat dissipation of the first and second variable frequency main motors and the control cabinet.
In order to reduce the interference of the frequency converter on a power grid, the circuit also comprises a three-phase filter D, the three-phase filter D is connected to three phase lines of a three-phase power supply in parallel, and the added three-phase filter is T110-50FS of Beijing Aike.
The three control ports of the phase sequence relay are respectively connected to phase lines of a three-phase power supply and used for preventing the oil pump from reversing and damaging the oil pump due to the fact that the phase sequence is wrongly accessed when the three phases are input. When the phase sequence is disordered, the switch XJ on the phase sequence relay control L0 is switched off, so that the input current of the 24VDC switching power supply is switched off, the PLC controller loses the direct current 24V voltage power supply to stop working, and the oil pump is prevented from being damaged.
Further, in fig. 6, an oil pump start switch SB8 and an oil pump stop switch SB9 are also connected to the input end of the PLC controller, one end of the oil pump start switch SB8 and one end of the oil pump stop switch SB9 are connected to a 24V dc voltage, the other end of the oil pump start switch SB8 is connected to the No. 5 line of the PLC, and the other end of the oil pump stop switch SB9 is connected to the No. 6 line of the PLC controller; the 19 th wire of the PLC controller is connected to a 0V power supply through a KR2 relay coil. Correspondingly, fig. 5 shows a connection circuit diagram of oil pump start and stop control, and as can be seen from fig. 5, the normally open contact of the relay KR2 is connected in series with the coil of the oil pump contactor KM2 and then connected across the two ends of the 220V ac voltage, and the oil pump switch contactor KM2 is used for controlling the start and stop of the oil pump motor.
In addition, the input end of the PLC is also connected with a cylinder extension switch SB10 and a cylinder retraction switch SB11, one end of a cylinder extension switch SB10 and one end of a cylinder retraction switch SB11 are connected to 24V direct current voltage, and the other end of an oil pump starting switch SB10 is connected to a No. 8 line of the PLC; the other end of the oil pump stop switch SB11 is connected to the No. 9 line of the PLC controller. No. 21 line that the PLC controller came out is connected to the 0V power through KR3 relay coil, and No. 22 line that the PLC controller came out is connected to the 0V power through KR4 relay coil.
As can be seen in fig. 5, the indicator light H3, the freewheeling diode D1, and the solenoid valve SL1 are connected in parallel and then connected in series with the normally open contact of the KR3 relay to form a cylinder extension control branch, and the cylinder extension control branch is connected between 0V and 24V; the indicating lamp H4, the freewheeling diode D2 and the solenoid valve SL2 are connected in parallel and then are connected in series with the normally open contact of the KR4 relay to form a cylinder retraction control branch, and the cylinder retraction control branch is connected between 0V and 24V.
The circuit also comprises a hydraulic and oil cylinder displacement stroke monitoring circuit, the hydraulic and oil cylinder displacement stroke monitoring circuit is shown in figure 7, the hydraulic and oil cylinder displacement stroke monitoring circuit comprises an oil pressure sensor, a displacement stroke sensor, a direct current signal isolator and an analog quantity input module, and the oil pressure sensor and the displacement stroke sensor are respectively connected with the input end of the direct current signal isolator and are used for outputting the collected oil pressure analog signal and the collected displacement analog signal to the analog quantity input module through the direct current signal isolator;
the analog quantity input module converts the oil pressure analog signal and the displacement analog signal into an oil pressure digital signal and a displacement digital signal, and the oil pressure digital signal and the displacement digital signal are sent to the PLC and processed by a CPU on the PLC to display the pressure of the oil cylinder and the stroke of the oil cylinder.
Fig. 8 is a diagram showing a connection relationship of an IT6070T touch panel using kywa for displaying oil pressure and a cylinder displacement amount through the touch panel.
Example 2
The embodiment mainly provides the selection and parameter setting in the circuit.
1. Selecting main elements:
1) in order to enable two motors to be started and stopped synchronously and reduce errors in synchronization in work, a general PLC of a CPU CR40S of S7-200SMART series produced by Siemens is used as a main controller, and a touch screen adopts a Huichuan IT 6070T.
2) In consideration of universality and the current load condition of a control electric appliance, the relay selects an RXM2LB2BD DC24V direct-current relay produced by Schneider; the contactor selects an alternating current contactor produced in nature.
3) In order to reduce the interference of the frequency converter to the power grid: a three-phase filter is added, and T110-50FS of Beijing Aike is selected.
4) The variable frequency motor adopts: YHF 2-112M-4.
5) The frequency converter uses 2 JL-V81VV43040L (4.0/5.5KW) of Suzhou Julian electric Limited.
2. The working condition is as follows:
1) firstly, an external rotation speed adjusting potentiometer W1(10K omega) is used as the speed setting of the first variable frequency controller.
2) Because the precision requirement is not high, the motor rotating speed signal of the first frequency converter can be output (AO1, GND) through an analog quantity terminal, and the output is used as the speed setting (AI1, GND) of the motor of the second frequency converter. Therefore, the running speeds of the two variable frequency motors are ensured to be consistent.
3) The hydraulic oil pump is protected, and the phenomenon that when a main power supply is connected, an oil pump motor rotates reversely, and the oil pump does not have oil to damage the hydraulic oil pump is avoided. A phase sequence relay is added in the circuit. Except that the main oil circuit is provided with a safety valve, the circuit is provided with a pressure measuring and controlling circuit, and when the oil pressure is higher than a set alarm value, an alarm indicator light and an alarm work; and when the set value of the stop of the oil pump is exceeded, the oil pump stops working. In order to ensure that the stroke of the oil cylinder is not changed due to external load when the oil pump stops working, a hydraulic lock is added to an oil cylinder working mechanism, and an oil cylinder stroke measuring circuit is designed, so that the stroke of the oil cylinder is convenient to regulate and control.
3. The passwords of the two frequency conversion controllers are set: 123456
4. Setting parameters of the two frequency converters:
(A) the first frequency converter and the second frequency converter have the same functional parameters:
(1): let H0.01 be 1 (terminal instruction channel)
(2): let H0.02 be 1 (analog AI1 setting)
(3): let H1.05 be 1 (free parking)
(4): let H2.01 be (4KW)
(5) H5.00 is 1 (positive rotation);
(6) h5.01 is set to be 2 (reversed);
(7) h5.02 is set as 7 (fault reset);
(8) h5.03 is set as 8 (external fault input);
(9) motor data input setting H2.00 aspect data (B) setting of functional parameters of 1# frequency converter and 2# frequency converter
(1) Setting H6.03A 01 (output selection)
The first frequency converter is set to 0 (operating frequency)
The second frequency converter is not changed
(2) Setting H9.00 PID (given source selection)
First frequency converter set to 0 (keyboard given)
The second frequency converter is set to 1 (given by analog channel AI 1)
5. Connection of Viagawa touch screen and Siemens S7-200SMART communication port
The detailed wiring diagram is shown in fig. 8. The communication parameters are required to be set respectively by connecting a programming communication port (PPI port) on a CPU unit of the PLC controller with the Huichuan HMI port. When the CPU is directly connected, the communication parameters in the software need to be set, and please refer to the technical manual provided by SIEMENS corporation for the detailed setting description.
1) Detailed communication wiring:
2) setting communication parameters:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A frequency conversion control circuit of a section steel cold bending machine comprises a forward rotation starting switch, a reverse rotation starting switch and a main motor, wherein the forward rotation starting switch and the reverse rotation starting switch are used for controlling the forward rotation or the reverse rotation of the main motor, the frequency conversion control circuit is characterized by further comprising a PLC controller and a frequency converter, the main motor is a frequency conversion motor,
the input end of the PLC controller is respectively connected with the forward rotation starting switch and the reverse rotation starting switch and is used for outputting a forward rotation starting control signal or a reverse rotation starting control signal to the frequency converter according to the state of the forward rotation starting switch or the reverse rotation starting switch;
the input end of the frequency converter is connected with the output end of the PLC controller, the output end of the frequency converter is connected with the variable frequency motor, the frequency converter is used for outputting or stopping outputting the alternating current with the changed frequency to the variable frequency motor according to the forward rotation starting control signal or the reverse rotation starting control signal,
the variable frequency motor is used for controlling the speed reducer to operate;
and the analog input end of the frequency converter is connected with a rotating speed adjusting potentiometer, and the rotating speed adjusting potentiometer is used for adjusting the frequency of the alternating current output by the frequency converter.
2. A variable frequency control circuit for a section steel forming mill as claimed in claim 1, wherein said main motor includes a first variable frequency main motor and a second variable frequency main motor, and the frequency converter includes a first frequency converter and a second frequency converter,
the forward rotation starting control signal or the reverse rotation starting control signal is output to the first frequency converter and the second frequency converter in parallel, the first frequency converter outputs or stops outputting alternating current to the first frequency conversion main motor, and the second frequency converter outputs or stops outputting alternating current to the second frequency conversion main motor,
the analog input port of the first frequency converter is connected with a potentiometer W1, and the potentiometer W1 is used for setting the frequency of the alternating current output by the first frequency converter;
and the analog output port of the first frequency converter is connected with the analog input port of the second frequency converter, and the analog output port of the first frequency converter is used for outputting a speed given signal to the analog input port of the second frequency converter.
3. The frequency conversion control circuit of a section steel cold bending machine according to claim 2, wherein one end of the forward rotation start switch and the reverse rotation start switch is connected with a 24V dc voltage, and the other end of the forward rotation start switch and the reverse rotation start switch is connected to the PLC controller through different ports.
4. A frequency conversion control circuit of a section steel cold bending machine according to claim 3, wherein the first frequency converter and the second frequency converter are of a type JL-V81VV43040L, the R terminal, the S terminal and the T terminal of the first frequency converter and the second frequency converter are respectively connected to three phase lines of a three-phase power supply, and the U terminal, the V terminal and the W terminal of the first frequency converter and the second frequency converter are respectively connected to a first frequency conversion main motor and a second frequency conversion main motor.
5. The frequency conversion control circuit of a section steel cold bending machine according to claim 4, further comprising a first frequency conversion main motor cooling fan, a second frequency conversion main motor cooling fan and a control cabinet cooling fan, wherein power input ends of the first frequency conversion main motor cooling fan, the second frequency conversion main motor cooling fan and the control cabinet cooling fan are respectively connected with three phase lines of a three-phase power supply, the first frequency conversion main motor cooling fan and the second frequency conversion main motor cooling fan are respectively used for cooling the first frequency conversion main motor and the second frequency conversion main motor, and the control cabinet cooling fan is used for cooling a control cabinet.
6. A variable frequency control circuit for a section steel forming mill according to claim 5, further comprising a three-phase filter connected in parallel to the phase lines of the three-phase power supply for reducing interference of the frequency converter with the power grid.
7. A frequency conversion control circuit of a section steel cold bending machine according to any one of claims 1 to 6, wherein an oil pump start switch and an oil pump stop switch are further connected to the input end of the PLC controller, one end of the oil pump start switch and one end of the oil pump stop switch are connected to 24V DC voltage, and the other end of the oil pump start switch and the other end of the oil pump stop switch are connected to the input interface of the PLC controller; one output end of the PLC is connected to a 0V power supply through a relay KR2, the relay KR2 is connected with a coil KM2 of the oil pump control contactor in series and then bridged at two ends of 220V alternating-current voltage, and a coil KM2 of the oil pump control contactor is used for controlling the starting and stopping of the oil pump.
8. The frequency conversion control circuit of a section steel cold bending machine according to claim 7, further comprising a phase sequence relay, wherein three input ports of the phase sequence relay are respectively connected to the phase lines of a three-phase power supply, and are used for controlling the on-off of 24V direct current voltage and preventing the oil pump motor from reversing when a main power supply is connected.
9. The frequency conversion control circuit of a section steel cold bending machine according to claim 8, wherein an oil cylinder extension switch and an oil cylinder retraction switch are further connected to the input end of the PLC controller, one end of the oil cylinder extension switch and one end of the oil cylinder retraction switch are connected to a 24V direct current voltage, and the other end of the oil pump start switch and the other end of the oil pump stop switch are connected to the input interface of the PLC controller; one output end of the PLC is connected to a 0V power supply through a relay KR3 and used for outputting a cylinder extending control signal, one output end of the PLC is connected to the 0V power supply through a relay KR4 and used for outputting a cylinder retracting control signal,
an indicator lamp H3, a freewheeling diode D1 and a solenoid valve SL1 are connected in parallel and then are connected in series with a normally open contact of a relay KR3 to form an oil cylinder extension control branch, and the oil cylinder extension control branch is connected between 0V and 24V; an indicator lamp H4, a freewheeling diode D2 and a solenoid valve SL2 are connected in parallel and then connected in series with a normally open contact of the relay KR4 electric appliance to form a cylinder retraction control branch, and the cylinder retraction control branch is connected between 0V and 24V.
10. The frequency conversion control circuit of a section steel cold bending machine according to claim 9, further comprising a hydraulic and displacement stroke monitoring circuit, said hydraulic and displacement stroke monitoring circuit comprising an oil pressure sensor, a displacement stroke sensor, a DC signal isolator and an analog input module,
the oil pressure sensor and the displacement travel sensor are respectively connected with the input end of the direct current signal isolator and used for outputting the collected oil pressure analog signal and the collected displacement analog signal to the analog quantity input module through the direct current signal isolator;
the analog quantity input module converts the oil pressure analog signal and the displacement analog signal into an oil pressure digital signal and a displacement digital signal, and the oil pressure digital signal and the displacement digital signal are used for displaying the pressure of the oil cylinder and the stroke of the oil cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220021502.2U CN216904717U (en) | 2022-01-05 | 2022-01-05 | Frequency conversion control circuit of section steel cold bending machine |
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| CN202220021502.2U CN216904717U (en) | 2022-01-05 | 2022-01-05 | Frequency conversion control circuit of section steel cold bending machine |
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