CN116945768A - Corrugated board digital printer control system - Google Patents
Corrugated board digital printer control system Download PDFInfo
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- CN116945768A CN116945768A CN202310812322.5A CN202310812322A CN116945768A CN 116945768 A CN116945768 A CN 116945768A CN 202310812322 A CN202310812322 A CN 202310812322A CN 116945768 A CN116945768 A CN 116945768A
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- 239000003990 capacitor Substances 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 8
- 230000005669 field effect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17566—Ink level or ink residue control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17566—Ink level or ink residue control
- B41J2002/17583—Ink level or ink residue control using vibration or ultra-sons for ink level indication
Abstract
The invention relates to the technical field of digital printers and provides a corrugated board digital printer control system which comprises an ultrasonic transmitting circuit, wherein the ultrasonic transmitting circuit comprises a switching tube Q1, a switching tube Q2, a resistor R5, a transformer T1 and an ultrasonic transmitter Y1, a control end of the switching tube Q1 and a control end of the switching tube Q2 are used for receiving PWM signals, a first end of the switching tube Q1 is connected with a first input end of the transformer T1, a second end of the switching tube Q1 is connected with a first end of the resistor R5, a second end of the resistor R5 is grounded, a first end of the switching tube Q2 is connected with a second input end of the transformer T1, a second end of the switching tube Q2 is connected with a first end of the resistor R5, a first output end of the transformer T1 is connected with a first end of the ultrasonic transmitter Y1, and a second output end of the transformer T1 is connected with a second end of the ultrasonic transmitter Y1. Through above-mentioned technical scheme, solved the problem that ultrasonic ranging precision is low among the prior art.
Description
Technical Field
The invention relates to the technical field of digital printers, in particular to a corrugated board digital printer control system.
Background
The corrugated board digital printer is a device for printing corrugated board, the control of ink in the printing process is an indispensable link for obtaining high-quality printed matter, if ink in an ink box is too small in the printing process, ink break can be caused, the quality of the printed matter is affected, a series of preparation work performed during restarting can also bring time, ink, corrugated board and the like waste, so that the monitoring of the minimum amount of ink in the ink box is necessary, the existing monitoring of the minimum amount of ink in the ink box is generally realized by a distance measurement principle, the ultrasonic distance measurement is a non-contact detection mode, compared with the traditional optical detection, the ultrasonic distance measurement is not affected by factors such as light, measured object color and the like, and is particularly suitable for measuring the measured object in severe environments such as dust, smog, electromagnetic interference, toxicity and the like, therefore, the ultrasonic distance measurement has wide application, but in the existing ultrasonic distance measurement, the driving capability of an ultrasonic transmitter is weak, the ultrasonic signal which is led to be unstable, the problem of low measurement accuracy exists, and the printing quality of the corrugated board cannot be ensured.
Disclosure of Invention
The invention provides a corrugated board digital printer control system, which solves the problem of low ultrasonic ranging precision in the prior art.
The technical scheme of the invention is as follows:
the corrugated board digital printer control system comprises a main control unit, an ultrasonic transmitting circuit and an ultrasonic receiving circuit, wherein the ultrasonic transmitting circuit and the ultrasonic receiving circuit are both connected with the main control unit, the ultrasonic transmitting circuit comprises a NOT gate U2, a driver U1, a resistor R2, a switch tube Q1, a switch tube Q2, a resistor R5, a transformer T1 and an ultrasonic transmitter Y1,
the input end of the NOT gate U2 is connected with the first output end of the main control unit, the output end of the NOT gate U2 is connected with the first input end of the driver U1, the second input end of the driver U1 is connected with the input end of the NOT gate U2, the first output end of the driver U1 is connected with the control end of the switch tube Q1 through the resistor R1, the second output end of the driver U1 is connected with the control end of the switch tube Q2 through the resistor R2, the first end of the switch tube Q1 is connected with the first input end of the transformer T1, the second end of the switch tube Q1 is connected with the first end of the resistor R5, the second end of the resistor R5 is grounded, the first end of the switch tube Q2 is connected with the second input end of the transformer T1, the second end of the switch tube Q2 is connected with the first end of the resistor R5, the third input end of the transformer T1 is connected with the control end of the switch tube Q2, the first end of the transformer T1 is connected with the first end of the transformer T1, and the second end of the transformer Y1 is connected with the ultrasonic wave transmitter.
Further, the ultrasonic transmitting circuit in the invention further comprises a resistor R7, an optical coupler U8 and a resistor R6, wherein a first input end of the optical coupler U8 is connected with a first output end of the main control unit through the resistor R7, a second input end of the optical coupler U8 is grounded, a first output end of the optical coupler U8 is connected with a 5V power supply through the resistor R6, and a second output end of the optical coupler U8 is connected with an input end of the NOT gate U2.
Further, the ultrasonic transmitting circuit in the invention further comprises a resistor R8, a switch tube Q3 and a switch tube Q4, wherein the first end of the resistor R8 is connected with the first end of the resistor R5, the second end of the resistor R8 is connected with the control end of the switch tube Q4, the control end of the switch tube Q4 is connected with the control end of the switch tube Q3, the first end of the switch tube Q3 is connected with the control end of the switch tube Q1, the second end of the switch tube Q3 is grounded, the first end of the switch tube Q4 is connected with the control end of the switch tube Q2, and the second end of the switch tube Q4 is grounded.
Further, the ultrasonic receiving circuit in the present invention includes an ultrasonic receiver Y2, a resistor R10, a resistor R11, an operational amplifier U7, a resistor R13, a resistor R14, an operational amplifier U3, a resistor R16, and a resistor R17, wherein the non-inverting input end of the operational amplifier U7 is connected to the first end of the ultrasonic receiver Y2, the second end of the ultrasonic receiver Y2 is grounded, the non-inverting input end of the operational amplifier U7 is connected to the 5V power supply through the resistor R10, the non-inverting input end of the operational amplifier U7 is grounded through the resistor R11, the inverting input end of the operational amplifier U7 is connected to the inverting input end of the operational amplifier U7 through the resistor R14, the output end of the operational amplifier U7 is connected to the non-inverting input end of the operational amplifier U3, the inverting input end of the operational amplifier U3 is grounded through the resistor R16, and the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R17.
Further, the invention also comprises a filter circuit, wherein the filter circuit comprises a resistor R15, a capacitor C7, a resistor R18, a capacitor C6, a resistor R21, a resistor R20, a resistor R19 and an operational amplifier U4, the first end of the resistor R15 is connected with the output end of the operational amplifier U3, the second end of the resistor R15 is connected with the inverting input end of the operational amplifier U4 through the capacitor C6, the second end of the resistor R15 is grounded through the resistor R18, the non-inverting input end of the operational amplifier U4 is connected with a 5V power supply through the resistor R20, the non-inverting input end of the operational amplifier U4 is grounded through the resistor R19, the output end of the operational amplifier U4 is grounded through the resistor R21, the output end of the operational amplifier U4 is connected with the second end of the resistor R15 through the capacitor C7, and the output end of the operational amplifier U4 is connected with the first input end of the main control unit.
Further, the invention also comprises an automatic control circuit, the automatic control circuit comprises a resistor R22, a resistor R23, a resistor R24, an operational amplifier U5, a resistor R27, a resistor R26, a resistor R28, a diode D5, a resistor R25, a switching tube Q5 and a resistor R29, the first end of the resistor R22 is connected with the output end of the operational amplifier U4, the second end of the resistor R22 is connected with the inverting input end of the operational amplifier U5 through the resistor R23, the non-inverting input end of the operational amplifier U5 is grounded through the resistor R24, the output end of the operational amplifier U5 is connected with the inverting input end of the operational amplifier U5 through the resistor R27, the output end of the operational amplifier U5 is connected with the first input end of the main control unit,
the first end of the resistor R26 is connected with the output end of the operational amplifier U5, the second end of the resistor R26 is grounded through the resistor R28, the anode of the diode D5 is connected with the second end of the resistor R26, the cathode of the diode D5 is connected with the control end of the switching tube Q5 through the resistor R25, the first end of the switching tube Q5 is connected with the second end of the resistor R22 through the resistor R29, and the second end of the switching tube Q5 is grounded.
Further, the invention also comprises an alarm circuit, wherein the alarm circuit comprises a resistor R30, a switch tube Q6, a switch tube Q7, a light emitting diode LED1 and a resistor R31, the control end of the switch tube Q6 is connected with the second output end of the main control unit through the resistor R30, the first end of the switch tube Q6 is connected with a 5V power supply through the resistor R31, the first end of the switch tube Q6 is connected with the control end of the switch tube Q7, the first end of the switch tube Q7 is connected with the 5V power supply, the second end of the switch tube Q6 is grounded, the first end of the switch tube Q7 is connected with the 5V power supply, the second end of the switch tube Q7 is connected with the first end of the light emitting diode LED1, and the cathode of the light emitting diode LED1 is grounded.
The working principle and the beneficial effects of the invention are as follows:
according to the invention, the ink quantity in the ink fountain of the printing press is detected by the ultrasonic ranging principle, the ultrasonic transmitting circuit is used for transmitting ultrasonic signals, the ultrasonic receiving circuit is used for receiving returned ultrasonic echo signals, converting the received ultrasonic echo signals into electric signals and sending the electric signals to the main control unit, and the main control unit judges the residual ink quantity in the ink fountain according to the time from the transmission of the ultrasonic signals to the reception of the ultrasonic echo signals.
Specifically, the working principle of the ultrasonic transmitting circuit is as follows: in the detection process, the main control unit outputs PWM signals, and as the driving capability of the PWM signals output by the main control unit is weaker, the switching tube Q1 and the switching tube Q2 cannot be directly driven, a driver U1 is added between the main control units for improving the driving capability of the PWM signals, meanwhile, a NOT gate U2 is added between the main control unit and the driver U1, one path of PWM signals output by the main control unit can be changed into two paths of PWM signals with opposite phases, so that an I/O port of the main control unit is saved, when the control end of the switching tube Q1 is at a high level, the control end of the switching tube Q2 is at a low level, the switching tube Q1 is conducted, the switching tube Q2 is cut off, a 15V power supply sequentially goes to the ground after passing through the third input end of the transformer T1, the first input end of the transformer T1, the switching tube Q1 and the resistor R5, the voltage is increased by the transformer T1, the output end of the transformer T1 is added at two ends of the ultrasonic transmitter Y1, at the moment, the first output end of the transformer T1 is positive, and the second output end of the transformer T1 is negative. When the control end of the switching tube Q1 is at a low level, the control end of the switching tube Q2 is at a high level, the switching tube Q1 is turned off, the switching tube Q2 is turned on, and the 15V power supply sequentially passes through the third input end of the transformer T1, the second input end of the transformer T1, the switching tube Q2 and the resistor R5 and then goes to the ground, at this time, the first output end of the transformer T1 is negative, and the second output end of the transformer T1 is positive. The switching tube Q1 and the switching tube Q2 form a push-pull circuit for improving driving current, the switching tube Q1 and the switching tube Q2 are alternately conducted, a high-amplitude pulse signal is boosted and output through the transformer T1, and the ultrasonic transmitter Y1 radiates obtained energy in an acoustic energy mode.
According to the invention, the switching tube Q1 and the switching tube Q2 are controlled to be alternately conducted through one path of PWM signal, so that the driving capability of a circuit is improved, the ultrasonic transmitter Y1 obtains higher energy, the ultrasonic signal sent by the ultrasonic transmitter Y1 is ensured to be effectively transmitted, the problem of low ultrasonic ranging precision in the prior art is solved, and the printing quality of corrugated paper board is ensured further due to more precision in monitoring the ink quantity of the ink duct of the corrugated paper board digital printer.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a circuit diagram of an ultrasound transmit circuit in accordance with the present invention;
FIG. 2 is a circuit diagram of a isolation circuit of the present invention;
FIG. 3 is a circuit diagram of the protection circuit of the present invention;
FIG. 4 is a circuit diagram of an ultrasonic receiving circuit according to the present invention;
FIG. 5 is a circuit diagram of a filter circuit according to the present invention;
FIG. 6 is a circuit diagram of an automatic control circuit according to the present invention;
FIG. 7 is a circuit diagram of the alarm circuit of the present invention;
fig. 8 is a circuit diagram of an automatic inking circuit in the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, this embodiment provides a corrugated board digital printer control system, including a main control unit, ultrasonic emission circuit and ultrasonic receiving circuit all are connected with the main control unit, ultrasonic emission circuit includes NOT gate U2, driver U1, resistance R2, switch tube Q1, switch tube Q2, resistance R5, transformer T1 and ultrasonic transmitter Y1, the first output of main control unit is connected to NOT gate U2's input, the first input of driver U1 is connected to NOT gate U2's output, the second input of driver U1 connects the input of NOT gate U2, the first output of driver U1 passes through the control end of resistor R1 connection switch tube Q1, the second output of driver U1 passes through the control end of resistor R2 connection switch tube Q2, the first input of transformer T1 is connected to switch tube Q1, the first end of switch tube Q1 connects the first end of resistor R5, the second end of resistor R5 connects the first end of transformer T1, the second end of switch tube Q2 is connected to the second end of transformer T1, the first end of transformer T1 is connected to the second end of switch tube T1, the first end of transformer T1 is connected to the second end of transformer T1.
In this embodiment, the ink amount in the ink fountain of the printing press is detected by the principle of ultrasonic ranging, the ultrasonic transmitting circuit is used for transmitting an ultrasonic signal, the ultrasonic receiving circuit is used for receiving a returned ultrasonic echo signal, converting the received ultrasonic echo signal into an electric signal and sending the electric signal to the main control unit, and the main control unit judges the remaining condition of the ink amount in the ink fountain according to the time from the transmission of the ultrasonic signal to the reception of the ultrasonic echo signal.
Specifically, the working principle of the ultrasonic transmitting circuit is as follows: in the detection process, the main control unit outputs PWM signals, the PWM signals are added to the first input end (INA pin) of the driver U1 after being inverted by the NOT gate U2, and meanwhile, the main control unit outputs PWM signals which are also added to the second input end (INB pin) of the driver U1, so that the phases of the PWM signals of the two input ends of the driver U1 are opposite, when the first input end (INA pin) of the driver U1 is at a high level, the first output end (OUTA pin) of the driver U1 outputs high-level signals, when the second input end (INB pin) of the driver U1 is at a high level, the second output end (OUTB pin) of the driver U1 outputs high-level signals, the two paths of PWM signals output by the driver U1 are respectively added to the control end of the switching tube Q1 and the switching tube Q2 after passing through the resistor R1 and the resistor R2, and the driving capability of the PWM signals output by the main control unit is weak, the switching tube Q1 and the switching tube Q2 cannot be directly driven, and therefore the driver U1 is added between the main control unit, the first output end (OUTA pin) of the driver U1 is used for improving the driving power, when the second input end (INB pin) of the driver U1 is at a high level, the second output end of the PWM signals is at a low level, the switching tube Q1 is turned on and the switching tube Q2 is turned on, the output by the switching tube Q1 is turned on, the output end is turned off, the output end is turned on and the switching tube Q2 is turned on and the output to the switching tube Q2 is turned on when the output to the output is turned on and the output to the switching tube Q1 is turned on and the output to the output is turned on and the output 2 is turned on and the output 1 and the output signal is output to the output. The second output of the transformer T1 is negative. When the control end of the switching tube Q1 is at a low level, the control end of the switching tube Q2 is at a high level, the switching tube Q1 is turned off, the switching tube Q2 is turned on, and the 15V power supply sequentially passes through the third input end of the transformer T1, the second input end of the transformer T1, the switching tube Q2 and the resistor R5 and then goes to the ground, at this time, the first output end of the transformer T1 is negative, and the second output end of the transformer T1 is positive.
The switching tube Q1 and the switching tube Q2 form a push-pull circuit for improving driving current, the switching tube Q1 and the switching tube Q2 are alternately conducted, a high-amplitude pulse signal is boosted and output through the transformer T1, and the ultrasonic transmitter Y1 radiates obtained energy in an acoustic energy mode.
Among them, the diode D1, the diode D2, the diode D3, the diode D4 and the resistor R9 constitute an impedance matching circuit, and since the ultrasonic transmitter Y1 is a capacitive load, the peak pulses of the rising edge and the falling edge are reduced in order to improve the waveform quality, and thus the impedance matching circuit is added.
In this embodiment, the switching tube Q1 and the switching tube Q2 are controlled to be alternately turned on by one path of PWM signal, so that the driving capability of the circuit is improved, the ultrasonic transmitter Y1 obtains higher energy, and the ultrasonic signal sent by the ultrasonic transmitter Y1 is ensured to be effectively transmitted, thereby solving the problem of low ultrasonic ranging precision in the prior art.
As shown in fig. 2, the ultrasonic transmitting circuit in this embodiment further includes a resistor R7, an optocoupler U8, and a resistor R6, where a first input end of the optocoupler U8 is connected to a first output end of the main control unit through the resistor R7, a second input end of the optocoupler U8 is grounded, a first output end of the optocoupler U8 is connected to a 5V power supply through the resistor R6, and a second output end of the optocoupler U8 is connected to an input end of the not gate U2.
In this embodiment, the driving ultrasonic transmitter Y1 is a high-voltage pulse signal, the high-voltage pulse signal is far greater than the low-voltage PWM signal outputted by the main control unit, and in the ranging process, the high-voltage pulse signal may affect the main control unit, so that an isolation circuit is added between the driver U1 and the main control unit, and the isolation circuit is formed by the optocoupler U8, so as to perform the function of signal isolation, prevent the signals from interfering with each other, and protect the main control unit. The first input end of the optical coupler U8 is used for receiving the PWM signal output by the main control unit, when the PWM signal is at a high level, the optical coupler U8 is conducted, and the optical coupler U8 outputs a high level signal to the input end of the NOT gate U2 and the second input end of the driver U1; when the PWM signal is at a low level, the optocoupler U8 is turned off, and the optocoupler U8 outputs a low level.
As shown in fig. 3, the ultrasonic transmitting circuit in this embodiment further includes a resistor R8, a switch tube Q3, and a switch tube Q4, where a first end of the resistor R8 is connected to a first end of the resistor R5, a second end of the resistor R8 is connected to a control end of the switch tube Q4, a control end of the switch tube Q4 is connected to a control end of the switch tube Q3, a first end of the switch tube Q3 is connected to a control end of the switch tube Q1, a second end of the switch tube Q3 is grounded, a first end of the switch tube Q4 is connected to a control end of the switch tube Q2, and a second end of the switch tube Q4 is grounded.
In this embodiment, an N-channel enhancement type field effect transistor is adopted as the switching transistor Q1 and the switching transistor Q2, the gate of the N-channel enhancement type field effect transistor is adopted as the control ends of the switching transistor Q1 and the switching transistor Q2, the drain of the N-channel enhancement type field effect transistor is adopted as the first ends of the switching transistor Q1 and the switching transistor Q2, and the source of the N-channel enhancement type field effect transistor is adopted as the second ends of the switching transistor Q1 and the switching transistor Q2. An NPN triode is adopted as a switching tube Q3 and a switching tube Q4, the base electrode of the NPN triode is adopted as the control ends of the switching tube Q3 and the switching tube Q4, the collector electrode of the NPN triode is adopted as the first ends of the switching tube Q3 and the switching tube Q4, and the emitter electrode of the NPN triode is adopted as the second ends of the switching tube Q3 and the switching tube Q4.
I DSM The (maximum drain-source current) is a limiting parameter of the field effect transistor, and refers to the maximum current allowed to pass between the drain and the source when the field effect transistor works normally. The working current of the field effect transistor should not exceed I DSM If this value is exceeded, the field effect transistor will be directly damaged, and therefore, the present embodiment incorporates a protection circuit that turns off the switching transistor Q1 or the switching transistor Q2 when the current flowing through the switching transistor Q1 or the switching transistor Q2 exceeds a set value, so as not to damage the switching transistor Q1 or the switching transistor Q2. The protection circuit is composed of a resistor R8, a switching tube Q3 and a switching tube Q4.
The resistor R5 forms a sampling resistor, when the switching tube Q1 or the switching tube Q2 is turned on, a current flows through the resistor R5, a voltage is generated on the resistor R5, and the larger the current on the resistor R5 is, the larger the voltage is. When the drain-source current of the switching tube Q1 or the switching tube Q2 is lower than a set value, the voltage on the resistor R5 is lower than the conducting voltage of the switching tube Q3 and the switching tube Q4, so that the switching tube Q3 and the switching tube Q4 are both cut off; when the drain-source currents of the switching tube Q1 and the switching tube Q2 are higher than the set value, the voltage on the resistor R5 is larger than the conducting voltage of the switching tube Q3 and the switching tube Q4, so that the switching tube Q3 and the switching tube Q4 are conducted, the control ends of the switching tube Q1 and the switching tube Q2 are grounded, the switching tube Q1 and the switching tube Q2 are in a static state, and the switching tube Q1 and the switching tube Q2 are protected.
As shown in fig. 4, the ultrasonic receiving circuit in this embodiment includes an ultrasonic receiver Y2, a resistor R10, a resistor R11, an operational amplifier U7, a resistor R13, a resistor R14, an operational amplifier U3, a resistor R16, and a resistor R17, where the in-phase input end of the operational amplifier U7 is connected to the first end of the ultrasonic receiver Y2, the second end of the ultrasonic receiver Y2 is grounded, the in-phase input end of the operational amplifier U7 is connected to a 5V power supply through the resistor R10, the in-phase input end of the operational amplifier U7 is grounded through the resistor R11, the inverting input end of the operational amplifier U7 is grounded through the resistor R13, the output end of the operational amplifier U7 is connected to the inverting input end of the operational amplifier U7 through the resistor R14, the inverting input end of the operational amplifier U3 is grounded through the resistor R16, the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R17, and the output end of the operational amplifier U3 is connected to the first input end of the main control unit.
In the ultrasonic receiving circuit, the ultrasonic receiver Y2 is configured to receive an ultrasonic echo signal, convert the received ultrasonic echo signal into an electrical signal, and output the electrical signal after being filtered by the capacitor C3, and then add the electrical signal to the in-phase input end of the operational amplifier U7, because the electrical signal output by the ultrasonic receiver Y2 is weak, the electrical signal needs to be amplified, the operational amplifier U7 forms a first amplifying circuit, the amplified electrical signal is sent to the in-phase input end of the operational amplifier U3 by the operational amplifier U7, the operational amplifier U3 forms a second amplifying circuit, and the two-stage amplifying circuit has a larger amplifying capability.
As shown in fig. 5, the embodiment further includes a filter circuit, where the filter circuit includes a resistor R15, a capacitor C7, a resistor R18, a capacitor C6, a resistor R21, a resistor R20, a resistor R19, and an operational amplifier U4, where a first end of the resistor R15 is connected to an output end of the operational amplifier U3, a second end of the resistor R15 is connected to an inverting input end of the operational amplifier U4 through the capacitor C6, a second end of the resistor R15 is grounded through the resistor R18, a non-inverting input end of the operational amplifier U4 is connected to a 5V power supply through the resistor R20, the non-inverting input end of the operational amplifier U4 is grounded through the resistor R19, an output end of the operational amplifier U4 is grounded through the resistor R21, and an output end of the operational amplifier U4 is connected to a second end of the resistor R15 through the capacitor C7, and an output end of the operational amplifier U4 is connected to a first input end of the main control unit.
The working environment of the corrugated board digital printer is complex, the ultrasonic receiver Y2 may also introduce some other interference noise signals during the process of receiving the ultrasonic echo signals, and these interference signals will affect the detection accuracy of the circuit, for this purpose, in this embodiment, a filter circuit is added between the operational amplifier U3 and the main control unit, and the resistor R15, the capacitor C7, the resistor R18, the capacitor C6, the resistor R21, the resistor R20, the resistor R19 and the operational amplifier U4 form a band-pass filter for filtering the high-frequency clutter signals and the noise signals in the output electrical signals of the operational amplifier U3, and finally the filtered electrical signals are sent to the main control unit.
As shown in fig. 6, the embodiment further includes an automatic control circuit, where the automatic control circuit includes a resistor R22, a resistor R23, a resistor R24, an operational amplifier U5, a resistor R27, a resistor R26, a resistor R28, a diode D5, a resistor R25, a switching tube Q5, and a resistor R29, where a first end of the resistor R22 is connected to an output end of the operational amplifier U4, a second end of the resistor R22 is connected to an inverting input end of the operational amplifier U5 through the resistor R23, a non-inverting input end of the operational amplifier U5 is grounded through the resistor R24, an output end of the operational amplifier U5 is connected to an inverting input end of the operational amplifier U5 through the resistor R27, an output end of the operational amplifier U5 is connected to a first input end of the master control unit, a first end of the resistor R26 is connected to an output end of the operational amplifier U5, a second end of the resistor R26 is grounded through the resistor R28, an anode of the diode D5 is connected to a second end of the resistor R26, a cathode of the diode D5 is connected to a control end of the switching tube Q5 through the resistor R25, and a first end of the switching tube Q5 is connected to a second end of the resistor R29.
The echo signal of the ultrasonic wave will change along with the change of the ranging, in order to better receive the echo, the change range of the amplitude of the echo signal needs to be fixed through gain control, so in this embodiment, an automatic control circuit is added between the op amp U4 and the main control unit, and the automatic control circuit is used for controlling the amplitude of the echo signal.
Specifically, the working principle of the automatic control circuit is as follows: the electric signal output by the operational amplifier U4 is added to the inverting input end of the operational amplifier U5 after passing through the resistor R22 and the resistor R23, the operational amplifier U5 forms an amplifying circuit, the resistor R26 and the resistor R28 form a voltage dividing circuit, the voltage on the resistor R28 is taken as a reference voltage, if the amplitude of the electric signal output by the operational amplifier U4 is increased, the amplitude of the electric signal output by the operational amplifier U5 is also increased, the voltage division on the resistor R28 is increased, the current at the control end of the switching tube Q5 is also increased, the current at the first end of the switching tube Q5 is increased, and the voltage division on the inverting input end of the operational amplifier U5 is reduced, so that the voltage output by the operational amplifier U5 is reduced; when the amplitude of the electric signal output by the operational amplifier U4 becomes smaller, the voltage division on the resistor R28 decreases, and the current at the control end of the switching tube Q5 decreases, so that the current at the first end of the switching tube Q5 decreases, and the voltage on the resistor R29 also decreases, so that the voltage at the input end of the operational amplifier U5 increases, and the amplitude of the electric signal output by the operational amplifier U5 increases. Therefore, the automatic control circuit can realize the function of adjusting the amplitude of the echo signal, and ensure that the amplitude of the electric signal output by the operational amplifier U5 is kept stable and unchanged, thereby enabling the main control unit to better receive the echo detection signal.
As shown in fig. 7, the embodiment further includes an alarm circuit, where the alarm circuit includes a resistor R30, a switch tube Q6, a switch tube Q7, a light emitting diode LED1 and a resistor R31, where a control end of the switch tube Q6 is connected to a second output end of the main control unit through the resistor R30, a first end of the switch tube Q6 is connected to a 5V power supply through the resistor R31, a first end of the switch tube Q6 is connected to a control end of the switch tube Q7, a first end of the switch tube Q7 is connected to the 5V power supply, a second end of the switch tube Q6 is grounded, a first end of the switch tube Q7 is connected to the 5V power supply, a second end of the switch tube Q7 is connected to a first end of the light emitting diode LED1, and a cathode of the light emitting diode LED1 is grounded.
In this embodiment, when it is detected that the ink amount in the ink fountain of the corrugated board digital printer is lower than the set value, the alarm circuit sends an alarm signal, and at this time, the corrugated board digital printer should stop working immediately, so that the ink amount in the ink fountain is too low, and the printing quality of the corrugated board is not good.
When the ink quantity in the ink fountain is higher than a set value, the main control unit outputs a high-level signal, the switching tube Q6 is switched on, and the switching tube Q7 is switched off, so that the light-emitting diode LED1 does not emit light; when the ink quantity in the ink fountain is lower than a set value, the main control unit outputs a low-level signal, the switching tube Q6 is turned off, the switching tube Q7 is turned on, and the light emitting diode LED1 emits light to remind a field worker that the ink quantity in the ink fountain is too low at the moment, and ink needs to be added.
Further, as shown in fig. 8, the embodiment further includes an automatic inking circuit, the automatic inking circuit includes an optocoupler U10, a resistor R12, a switching tube Q8 and a relay K2, a first input end of the optocoupler U10 is connected with a 5V power supply, a second input end of the optocoupler U10 is connected with a master control unit, a first output end of the optocoupler U10 is connected with a 9V power supply, a second output end of the optocoupler U10 is connected with a control end of the switching tube Q8 through the resistor R12, a first end of the switching tube Q8 is connected with a first input end of the relay K1, a second input end of the relay K1 is connected with a 9V power supply, a normally open end of the relay K1 is connected with a 9V power supply, and a common end of the relay K1 is connected with an inking device.
In this embodiment, when the ink amount of the ink fountain of the corrugated board digital printer is lower than the set value, the alarm circuit sends an alarm signal, and meanwhile, the corrugated board digital printer immediately stops working, and the staff works after adding ink into the ink fountain, so that the printing efficiency will be affected. When the ink quantity of the ink fountain of the corrugated board digital printer is lower than a set value, the main control unit outputs a low-level signal to the second input end of the optical coupler U10, the optical coupler U10 is turned on, the optical coupler U10 outputs a high-level signal to the control end of the switching tube Q8, the switching tube Q8 is turned on, the relay K1 is electrified and closed, the common end of the relay K1 is connected with the normal end of the relay K1, the inking device is electrified to start automatic inking of the ink fountain, when the ink quantity is higher than an upper limit set value, the main control unit outputs a high-level signal to the second input end of the optical coupler U10, the optical coupler U10 is turned off, the optical coupler U10 outputs a low level to the control end of the switching tube Q8, the switching tube Q8 is turned off, and the relay K1 is powered off, namely the inking device is powered off.
In this embodiment, a micro water pump is used as the ink adding device, and the micro water pump is connected with the ink fountain through a pipeline.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The corrugated board digital printer control system is characterized by comprising a main control unit, an ultrasonic transmitting circuit and an ultrasonic receiving circuit, wherein the ultrasonic transmitting circuit and the ultrasonic receiving circuit are both connected with the main control unit, the ultrasonic transmitting circuit comprises a NOT gate U2, a driver U1, a resistor R2, a switching tube Q1, a switching tube Q2, a resistor R5, a transformer T1 and an ultrasonic transmitter Y1,
the input end of the NOT gate U2 is connected with the first output end of the main control unit, the output end of the NOT gate U2 is connected with the first input end of the driver U1, the second input end of the driver U1 is connected with the input end of the NOT gate U2, the first output end of the driver U1 is connected with the control end of the switch tube Q1 through the resistor R1, the second output end of the driver U1 is connected with the control end of the switch tube Q2 through the resistor R2, the first end of the switch tube Q1 is connected with the first input end of the transformer T1, the second end of the switch tube Q1 is connected with the first end of the resistor R5, the second end of the resistor R5 is grounded, the first end of the switch tube Q2 is connected with the second input end of the transformer T1, the second end of the switch tube Q2 is connected with the first end of the resistor R5, the third input end of the transformer T1 is connected with the control end of the switch tube Q2, the first end of the transformer T1 is connected with the first end of the transformer T1, and the second end of the transformer Y1 is connected with the ultrasonic wave transmitter.
2. The corrugated board digital printer control system according to claim 1, wherein the ultrasonic transmitting circuit further comprises a resistor R7, an optocoupler U8 and a resistor R6, a first input end of the optocoupler U8 is connected with a first output end of the main control unit through the resistor R7, a second input end of the optocoupler U8 is grounded, a first output end of the optocoupler U8 is connected with a 5V power supply through the resistor R6, and a second output end of the optocoupler U8 is connected with an input end of the non-gate U2.
3. The corrugated board digital printer control system according to claim 1, wherein the ultrasonic transmitting circuit further comprises a resistor R8, a switching tube Q3 and a switching tube Q4, a first end of the resistor R8 is connected with a first end of the resistor R5, a second end of the resistor R8 is connected with a control end of the switching tube Q4, a control end of the switching tube Q4 is connected with a control end of the switching tube Q3, a first end of the switching tube Q3 is connected with a control end of the switching tube Q1, a second end of the switching tube Q3 is grounded, a first end of the switching tube Q4 is connected with a control end of the switching tube Q2, and a second end of the switching tube Q4 is grounded.
4. The corrugated board digital printer control system according to claim 1, wherein the ultrasonic receiving circuit comprises an ultrasonic receiver Y2, a resistor R10, a resistor R11, an operational amplifier U7, a resistor R13, a resistor R14, an operational amplifier U3, a resistor R16 and a resistor R17, wherein the non-inverting input end of the operational amplifier U7 is connected to the first end of the ultrasonic receiver Y2, the second end of the ultrasonic receiver Y2 is grounded, the non-inverting input end of the operational amplifier U7 is connected to the 5V power supply through the resistor R10, the non-inverting input end of the operational amplifier U7 is grounded through the resistor R13, the output end of the operational amplifier U7 is connected to the non-inverting input end of the operational amplifier U7 through the resistor R14, the non-inverting input end of the operational amplifier U3 is grounded through the resistor R16, and the output end of the operational amplifier U7 is connected to the first input end of the operational amplifier U3 through the non-inverting input end of the resistor R17.
5. The corrugated board digital printer control system according to claim 4, further comprising a filter circuit, wherein the filter circuit comprises a resistor R15, a capacitor C7, a resistor R18, a capacitor C6, a resistor R21, a resistor R20, a resistor R19 and an operational amplifier U4, a first end of the resistor R15 is connected to an output end of the operational amplifier U3, a second end of the resistor R15 is connected to an inverting input end of the operational amplifier U4 through the capacitor C6, a second end of the resistor R15 is grounded through the resistor R18, a non-inverting input end of the operational amplifier U4 is connected to a 5V power supply through the resistor R20, a non-inverting input end of the operational amplifier U4 is grounded through the resistor R19, an output end of the operational amplifier U4 is grounded through the resistor R21, an output end of the operational amplifier U4 is connected to a second end of the resistor R15 through the capacitor C7, and an output end of the operational amplifier U4 is connected to a first input end of the main control unit.
6. The corrugated board digital printer control system according to claim 5, further comprising an automatic control circuit, wherein the automatic control circuit comprises a resistor R22, a resistor R23, a resistor R24, an operational amplifier U5, a resistor R27, a resistor R26, a resistor R28, a diode D5, a resistor R25, a switching tube Q5 and a resistor R29, a first end of the resistor R22 is connected to an output end of the operational amplifier U4, a second end of the resistor R22 is connected to an inverting input end of the operational amplifier U5 through the resistor R23, a non-inverting input end of the operational amplifier U5 is grounded through the resistor R24, an output end of the operational amplifier U5 is connected to the inverting input end of the operational amplifier U5 through the resistor R27, an output end of the operational amplifier U5 is connected to a first input end of the main control unit,
the first end of the resistor R26 is connected with the output end of the operational amplifier U5, the second end of the resistor R26 is grounded through the resistor R28, the anode of the diode D5 is connected with the second end of the resistor R26, the cathode of the diode D5 is connected with the control end of the switching tube Q5 through the resistor R25, the first end of the switching tube Q5 is connected with the second end of the resistor R22 through the resistor R29, and the second end of the switching tube Q5 is grounded.
7. The corrugated board digital printer control system according to claim 1, further comprising an alarm circuit, wherein the alarm circuit comprises a resistor R30, a switch tube Q6, a switch tube Q7, a light emitting diode LED1 and a resistor R31, a control end of the switch tube Q6 is connected with a second output end of the main control unit through the resistor R30, a first end of the switch tube Q6 is connected with a 5V power supply through the resistor R31, a first end of the switch tube Q6 is connected with a control end of the switch tube Q7, a first end of the switch tube Q7 is connected with a 5V power supply, a second end of the switch tube Q6 is grounded, a first end of the switch tube Q7 is connected with a 5V power supply, a second end of the switch tube Q7 is connected with a first end of the light emitting diode LED1, and a cathode of the light emitting diode LED1 is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310812322.5A CN116945768A (en) | 2023-07-04 | 2023-07-04 | Corrugated board digital printer control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310812322.5A CN116945768A (en) | 2023-07-04 | 2023-07-04 | Corrugated board digital printer control system |
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| CN116945768A true CN116945768A (en) | 2023-10-27 |
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| CN205970422U (en) * | 2016-07-27 | 2017-02-22 | 浙江远图互联科技股份有限公司 | Printer lacks paper autonomous system with ultrasonic distance measuring sensor |
| CN109194145A (en) * | 2018-10-23 | 2019-01-11 | 阳光电源股份有限公司 | It recommends the driving circuit of Switching Power Supply and recommends Switching Power Supply |
| CN218917954U (en) * | 2022-09-30 | 2023-04-25 | 皮彦芳 | Tunnel information monitoring system |
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|---|---|---|---|---|
| US8848486B1 (en) * | 2011-05-13 | 2014-09-30 | Cooper Technologies Company | Ultrasonic transmitter having adjustable output |
| WO2015096223A1 (en) * | 2013-12-27 | 2015-07-02 | 深圳市航嘉驰源电气股份有限公司 | Power conversion circuit |
| CN204622809U (en) * | 2015-05-19 | 2015-09-09 | 深圳市旺盈彩盒纸品有限公司 | A kind of ink in printing press amount supervising device |
| CN205970422U (en) * | 2016-07-27 | 2017-02-22 | 浙江远图互联科技股份有限公司 | Printer lacks paper autonomous system with ultrasonic distance measuring sensor |
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| CN109194145A (en) * | 2018-10-23 | 2019-01-11 | 阳光电源股份有限公司 | It recommends the driving circuit of Switching Power Supply and recommends Switching Power Supply |
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