CN108832854B - Security check machine and power control circuit thereof - Google Patents
Security check machine and power control circuit thereof Download PDFInfo
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- CN108832854B CN108832854B CN201811051760.XA CN201811051760A CN108832854B CN 108832854 B CN108832854 B CN 108832854B CN 201811051760 A CN201811051760 A CN 201811051760A CN 108832854 B CN108832854 B CN 108832854B
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- 238000007689 inspection Methods 0.000 claims abstract description 66
- 230000005855 radiation Effects 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 4
- 230000001934 delay Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
- H02P7/05—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors by means of electronic switching
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention discloses a security inspection machine and a power supply control circuit thereof, wherein the security inspection machine comprises a key switch, a starting button, a main switch tube, a first photoelectric coupler, a first resistor and a first relay; the main switching tube and the first switching tube are connected in series between the anode and the cathode of the direct current power supply, and the first photoelectric coupler is connected in parallel with the first switching tube; the first resistor is used for enabling the level of the positive input end of the first photoelectric coupler to be changed from high to low after the shutdown control signal output end of the control board outputs the shutdown control signal; each control component and the working component serial circuit of the security inspection machine are connected in parallel between the second end of the main switch tube and the negative electrode of the direct current power supply, and the coil end of the first relay and a plurality of emergency stop buttons are connected in series in the working component serial circuit; the contact both ends of first relay are connected respectively the working assembly of total power and security inspection machine. The invention does not use a contactor to control the power supply of the switching machine, reduces the number of relays, has low cost and small interference, and has high detection accuracy of the security inspection machine.
Description
Technical Field
The invention relates to the technical field of security inspection machines, in particular to a security inspection machine and a power supply control circuit thereof.
Background
The security inspection machine consists of a power panel, a direct-current roller motor, an X-ray source, a detection box, a control panel, a collection panel, a display, an industrial personal computer, a switching power supply, a light barrier, an indicator light, a cooling fan, a keyboard and an emergency stop button. The power panel circuit is used for controlling power supply of other components, as shown in figures 1-3, and figure 1 is a schematic diagram of a power on/off control circuit part on a power circuit of a current security inspection machine; FIG. 2 is a schematic diagram of a motor forward/reverse rotation control circuit part on a power supply circuit of a security inspection motor; fig. 3 is a schematic structural diagram of a motor control circuit part on a motor power supply circuit of a security inspection machine at present.
The KA1 relay is normally closed, and when the key switch and the start button are pressed down (the control panel is connected with the key switch and the start button and used for detecting the starting and the shutting down), the KA2 relay is attracted, so that the attraction of the KM1 contactor is controlled, the power panel circuit is electrified, and therefore the rear end assembly is electrified. After the scram button is pressed, KM2 is attracted (a control board is connected with KM2 for scram button detection). KA4, KA5 are used for controlling the motor controller to control the positive and negative rotation of the roller motor. KA3 is used for controlling the motor to stop after the tight stop button or the tact switch is pressed. In the relay and contactor (the parts expressed by KAn or KMn) in the figures, the part with a square frame is the coil end of the relay or contactor, the part expressed by a switch symbol is one group of contacts of the relay or contactor, and the switch KM1 part in figures 1 and 2 respectively expresses two groups of contacts of the KM1 contactor; the switch KM2 sections of fig. 1,2 and 3 represent three sets of contacts of the KM2 contactor, respectively; the same applies to KA 2.
It can be seen that the whole power panel circuit requires 5 relays and 5 to 6 contactors, and the on-off control circuit part also requires 3 relays and 2 contactors to realize. The power panel circuit is too complicated, a plurality of relays are needed to control a plurality of contactors, the purpose of power supply control is achieved, the number of the relays and the number of the contactors are large, the cost is high, the contactors or the relays work as contacts, ignition is easily caused at the moment of contact attraction and disconnection, and interference caused by counter electromotive force generated by the contactors or relay coils affects the detection accuracy of the security inspection machine.
Therefore, how to provide a security inspection machine with low cost and high accuracy and a power control circuit thereof is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a security inspection machine and a power supply control circuit thereof, which do not use a contactor to control power supply, reduce the number of relays used, have low cost, and can avoid the ignition interference and the interference caused by counter potential caused by the operation of the contactor and the relay contact as much as possible, so that the security inspection machine has high detection accuracy.
In order to solve the technical problems, the invention provides a power supply control circuit of a security inspection machine, comprising: the key switch, the starting button, the main switch tube, the first resistor of the first photoelectric coupler and the first relay;
The key switch is connected with the starting button in series, a first end of a circuit after the key switch is connected with the positive electrode of the direct current power supply and a first end of the main switching tube respectively, and a second end of the circuit after the key switch is connected with a control end of the first switching tube in series;
each control component of the security inspection machine and a working component series circuit are connected in parallel between the second end of the main switch tube and the negative electrode of the direct current power supply, and a coil end of the first relay and a plurality of emergency stop buttons are connected in series in the working component series circuit; the two ends of the contact of the first relay are respectively connected with a main power supply and a working assembly of the security inspection machine; the key switch is connected with an on-off signal end of a control board of the security inspection machine;
The control end of the main switching tube is respectively connected with the first end of the first switching tube and the positive output end of the first photoelectric coupler;
the second end of the first switch tube, the negative input end and the negative output end of the first photoelectric coupler are all connected with the negative end of the direct current power supply;
The positive output end of the first photoelectric coupler is connected with the first end of the first resistor, and the second end of the first resistor is respectively connected with the second end of the main switching tube and the shutdown control signal output end of the control panel; and the control board receives a shutdown signal sent when the key switch is arranged at the OFF position and outputs a shutdown control signal.
Preferably, the second resistor is further included;
The second end of the first resistor is directly connected with the shutdown control signal output end of the control board, and is connected with the second end of the main switch tube through the second resistor.
Preferably, the method further comprises: the second switch tube, the second photoelectric coupler, the third resistor, the fourth resistor and the fifth resistor;
The first end of the second switching tube is respectively connected with the positive input end of the third photoelectric coupler and the positive input end of the second photoelectric coupler through the third resistor; the second end of the second switching tube is connected with the second end of the main switching tube;
the negative input end of the second photoelectric coupler is connected with the control end of the second switching tube and the first positive and negative rotation signal output end of the control panel through the fifth resistor respectively;
The second positive and negative rotation signal output end of the control board is respectively connected with the positive input end of the second photoelectric coupler and the negative input end of the third photoelectric coupler through the fourth resistor;
The output end of the second photoelectric coupler is connected with the forward rotation control end of the motor controller of the security inspection machine, and the output end of the third photoelectric coupler is connected with the reverse rotation control end of the motor controller; and the control board receives a shutdown signal sent when the key switch is arranged at the OFF position and outputs a shutdown control signal.
Preferably, a second relay is further included;
The coil end of the second relay is connected in series between the second end of the main switch tube and the negative electrode of the direct-current power supply, two ends of a contact of the second relay are respectively connected with the main power supply and a display of the security inspection machine, and the second relay is used for controlling the on-off between the display and the main power supply.
Preferably, the main switch tube is a MOS tube, a first auxiliary resistor is connected between a source electrode and a grid electrode of the MOS tube, and a sixth resistor is connected in series between a control end of the main switch tube and a first end of the first switch tube.
Preferably, the first switching tube is a triode, and a second auxiliary resistor is connected between the base electrode and the emitter electrode of the first switching tube.
Preferably, the second switching tube is a triode, and a third auxiliary resistor is connected between the base electrode and the emitter electrode of the second switching tube; a seventh resistor is connected in series between the control end of the second switching tube and the fifth resistor.
Preferably, the key switch is connected with an on-OFF signal input end of the control board, the key switch sends an OFF signal to the control board when being placed at an OFF position, and the control board delays for a preset time length and then outputs the OFF control signal.
In order to solve the technical problems, the invention also provides a security inspection machine, which comprises a control component, a working component, a display, a plurality of scram buttons and a power supply control circuit as described in any one of the above;
wherein the control assembly comprises a control board; the working assembly includes a radiation source and a drum motor.
Preferably, the control panel is respectively connected with the emergency stop button and the display, and is used for outputting a stop signal to the display after the emergency stop button is detected to be pressed;
And after receiving the stop signal, the display displays a prompt triggered by the scram button.
The invention provides a power supply control circuit of a security inspection machine, which comprises a key switch, a starting button, a main switch tube, a first photoelectric coupler and a first resistor, wherein the main switch tube and the first switch tube are connected in series between the anode and the cathode of a direct current power supply, the first photoelectric coupler is connected with the first switch tube in parallel, the first resistor is used for pulling down the voltage of the positive input end of the first photoelectric coupler after a shutdown control signal output end of a control board outputs a shutdown control signal, then the positive output end of the photoelectric coupler is changed from low level to high level, the control end of the main switch tube is high level, the main switch tube is cut off, and the security inspection machine is shut down. In the power supply control circuit provided by the invention, after the key switch and the starting button are started, the control end of the first switch tube is connected with the positive electrode of the direct current power supply, the second end of the first switch tube is connected with the negative electrode of the direct current power supply, so that voltage drop is formed between the control end and the second end of the first switch tube, and then the first end of the main switch tube is connected with the first end of the first switch tube, and then the first end of the main switch tube is connected with the positive electrode of the direct current power supply, so that voltage drop is formed between the control end and the first end of the main switch tube, and the main switch tube is conducted, namely, the second end of the main switch tube is conducted with the positive electrode of the direct current power supply, all components connected between the second end of the main switch tube and the negative electrode of the direct current power supply are electrically operated, and after the coil end of the first relay is electrified, the two ends of the contacts of the first relay are conducted, so that the working components of the security inspection machine are electrically operated after being connected with the main power supply. After the control board outputs the shutdown control signal, the level of the positive input end of the first photoelectric coupler is pulled down from low to high, so that the output end of the first photoelectric coupler is cut off, the main switching tube is cut off, and all components of the rear-end security inspection machine are powered off.
Therefore, the invention does not need to arrange a plurality of relays and contactors to realize the purpose of power supply control (namely on-off control), but only uses three switching tubes, photoelectric couplers and a plurality of resistors, so that the cost is low, the ignition interference caused by the operation of the contactors and the relay contacts can be avoided as much as possible, the interference caused by counter-potential generated by the contactors or the relay coils is also avoided, and the detection accuracy of the security check machine is high. The invention also provides a security inspection machine, which has the advantages, and is not described in detail herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power on/off control circuit part of a power panel circuit of a security inspection machine;
FIG. 2 is a schematic diagram of a motor forward/reverse rotation control circuit part on a power supply circuit of a security inspection motor;
FIG. 3 is a schematic diagram of a motor control circuit portion on a current security inspection motor power supply circuit;
fig. 4 is a schematic structural diagram of a power control circuit of a security inspection machine provided by the invention.
Detailed Description
The invention has the core of providing a security inspection machine and a power supply control circuit thereof, wherein a contactor is not used for power supply control, the number of the relays is reduced, the cost is low, the ignition interference and the interference caused by counter-potential caused by the operation of the contactor and the relay contacts can be avoided as much as possible, and the security inspection machine has high detection accuracy.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled 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.
The invention provides a power supply control circuit of a security inspection machine, which is shown in fig. 4, and fig. 4 is a schematic structural diagram of the power supply control circuit of the security inspection machine.
The power supply control circuit includes: the key switch, the starting button, the main switch tube Q, the first switch tube Q1, the first photoelectric coupler U1, the first resistor R1 and the first relay K1;
The key switch is connected with the starting button in series, the first end of the circuit after the series connection is respectively connected with the positive electrode of the direct current power supply and the first end of the main switching tube Q, and the second end of the circuit after the series connection is connected with the control end of the first switching tube Q1; the key switch is connected with an on-off signal end of a control board of the security inspection machine;
Each control component of the security inspection machine and a working component series circuit are connected in parallel between the second end of the main switch tube Q and the negative electrode of the direct current power supply, and a coil end of a first relay K1 and a plurality of emergency stop buttons are connected in series in the working component series circuit; the two ends of the contact of the first relay K1 are respectively connected with a main power supply and a working assembly of the security inspection machine;
the control end of the main switching tube Q is respectively connected with the first end of the first switching tube Q1 and the positive output end of the first photoelectric coupler U1;
the second end of the first switching tube Q1, the negative input end and the negative output end of the first photoelectric coupler U1 are all connected with the negative end of the direct current power supply;
The positive input end of the first photoelectric coupler U1 is connected with the first end of the first resistor R1, and the second end of the first resistor R1 is respectively connected with the second end of the main switching tube Q and the shutdown control signal output end of the control panel; the control board receives a shutdown signal sent when the key switch is in an OFF position and outputs a shutdown control signal.
The total power supply here is usually referred to as 220V ac; the dc power supply is typically referred to as 12V dc. Of course, the present invention is not limited to the voltage values of the total power supply and the direct current power supply.
It should be noted that the first relay K1 in the present invention is a normally open relay with 2-point contacts, and after being electrified, the two contacts are closed and conducted.
The working process of the power supply control circuit is that after a key switch is placed at an ON position and a start button is pressed, a control end of a first switch tube Q1 is communicated with a positive electrode of a direct current power supply, and a second end of the first switch tube Q1 is connected with a negative electrode of the direct current power supply, so that a voltage drop is formed between the control end and the second end of the first switch tube Q1, and the first switch tube Q1 is conducted; then, as the control end of the main switching tube Q is connected with the first end of the first switching tube Q1, the first end of the main switching tube Q is connected with the positive electrode of the direct current power supply, voltage drop is formed between the control end and the first end of the main switching tube Q, and the main switching tube Q is conducted; the second end of the main switch tube Q is conducted with the positive electrode of the direct current power supply, so that all components connected between the second end of the main switch tube Q and the negative electrode of the direct current power supply are electrically powered, and after the coil end of the first relay K1 is electrified, the two ends of the contact of the first relay K1 are conducted (the contact is closed), and the working component of the security inspection machine is connected with the main power supply, so that the security inspection machine works electrically. At this time, the whole security inspection machine is powered on to start working. After that, since the positive input end of the first photoelectric coupler U1 is connected in parallel with the first switching tube Q1, after the main switching tube is turned on, the positive input end of the U1 forms a voltage drop with the negative input end through R1, so that the output end of the first photoelectric coupler U1 is turned on to be grounded, and the control end of the main switching tube Q continues to maintain a low level, so that the main switching tube Q is continuously in a turned-on state.
When the power-OFF is required, the key switch is arranged at the OFF position, and the key switch is connected with the power-on signal end of the control board, the key switch can send a power-OFF signal to inform the control board after being arranged at the OFF position, the control board can output a power-OFF control signal after receiving the power-OFF signal, the power-OFF control signal is a low-level signal, and the power-OFF control signal is pulled down to the voltage of the positive input end of the first photoelectric coupler U1 after the power-OFF control signal output end of the control board outputs the power-OFF control signal. The specific working process is that the voltage drop between the first end and the second end of the main switching tube Q is a constant value, so that the voltage value of the second end of the main switching tube Q is fixed after the main switching tube Q is turned on (the voltage drop between the first end and the second end is almost 0 because the MOS tube is very low in on-resistance), and the second end of the main switching tube Q is connected to the positive input end of the first photoelectric coupler U1 through the first resistor R1 and the second resistor R2 connected in series. After the control board outputs a shutdown control signal to the connection point of the first resistor R1 and the second resistor R2, the shutdown control signal is a low level signal, so that the positive input end of the first photoelectric coupler U1 is at a low level, at this time, the output of the first photoelectric coupler U1 is turned off, the control end of the main switching tube Q is changed from a low level to a high level, and the main switching tube Q is turned off, so that all components of the rear-end security inspection machine are powered off.
Therefore, the invention does not need to arrange a contactor to realize the purpose of power supply control, reduces the number of the relays, only uses three switching tubes, photoelectric couplers, a plurality of resistors and one relay, has low cost, can avoid the ignition interference caused by the operation of the contactor or the relay contact as much as possible, and also has the interference caused by counter-potential generated by the contactor or the relay coil, and has high detection accuracy of the security inspection machine.
In addition, because the coil end of the first relay K1 and a plurality of emergency stop buttons are connected in series between the second end of the main switch tube Q and the negative electrode of the direct current power supply, when a worker presses the emergency stop buttons or removes the side door plate to trigger the micro switch, the series circuit of the working assembly can be disconnected, so that the coil end of the first relay K1 is powered off, the two ends of the contact are disconnected, and further, the power is disconnected between the working assembly of the security inspection machine connected with the first relay K1 and the main power supply, thereby realizing the purpose of protecting the safety of the worker and equipment. The emergency stop button may include a plurality of common emergency stop buttons, a door panel micro switch (i.e. a touch switch that is closed by pressing the door panel), and the invention is not limited thereto. The working components herein may include an X-ray source, a drum motor, a heat dissipation fan, etc., which the present invention is not limited to.
The control assembly comprises a control board, a sampling board and an industrial personal computer; the working assembly comprises a ray source, a roller motor and a fan. Of course, the control assembly and the working assembly may also include other components, as the invention is not limited in this regard.
In a preferred embodiment, the power supply control circuit further includes a second resistor R2;
The second end of the first resistor R1 is directly connected with the shutdown control signal output end of the control panel, and is connected with the second end of the main switch tube Q through the second resistor R2.
It is understood that the first resistor R1 and the second resistor R2 are used as current limiting resistors, and the two resistors are used to prevent damage to the first photo coupler U1 in the case of a misconnection line.
In the process of controlling a roller motor of a security inspection machine, a circuit for controlling the forward and reverse rotation of the roller motor is usually required, and the current control of the forward and reverse rotation of the roller motor is realized by arranging a plurality of relays and contactors, as shown in fig. 2 and 3, fig. 2 is a schematic structural diagram of a motor forward and reverse rotation control circuit part on a current security inspection motor circuit; FIG. 3 is a schematic diagram of a motor control circuit portion on a current security inspection motor power supply circuit; after the relays KA2 and KA3 are attracted, the contactor KM2 is attracted, so that the circuit where the two ends of the contact KM2 in FIG. 2 are positioned is always kept on; referring to fig. 3, after km2 is attracted, both ends of the contact of KM2 in fig. 3 are conducted, and the drum motor is started. The relays KA4 and KA5 are controlled by the control board, when the control board receives a signal of forward rotation of the motor, the contacts of the KA4 are closed, the contacts 1 and 5 of the KA5 are closed, the 1 foot and the 5 foot on the direct current motor controller are short-circuited, and the roller motor rotates forward. When the control board receives a motor reversing signal, the contacts of KA4 are closed, the contacts 1 and 3 of KA5 are closed, the 1 foot and the 7 foot on the direct current motor controller are short-circuited, and the roller motor is reversed. In the control circuit, a plurality of relays and contactors are required to be arranged, the circuit structure is complex, the cost is high, and the contact on-off of the relays and the contactors can cause larger interference.
To solve the above-described problems, the present invention provides a preferred embodiment in which the power supply control circuit further includes: the second switch tube Q2, the second photoelectric coupler U2, the third photoelectric coupler U3, the third resistor R3, the fourth resistor R4 and the fifth resistor R5;
The first end of the second switching tube Q2 is respectively connected with the positive input end of the third photoelectric coupler U3 and the positive input end of the second photoelectric coupler U2 through a third resistor R3; the second end of the second switching tube Q2 is connected with the second end of the main switching tube Q;
the negative input end of the second photoelectric coupler U2 is connected with the control end of the second switching tube Q2 and the first positive and negative rotation signal output end of the control board through a fifth resistor R5 respectively;
the second positive and negative rotation signal output end of the control board is respectively connected with the positive input end of the second photoelectric coupler U2 and the negative input end of the third photoelectric coupler U3 through a fourth resistor R4;
the output end of the second photoelectric coupler U2 is connected with the forward rotation control end of the motor controller of the security inspection machine, and the output end of the third photoelectric coupler U3 is connected with the reverse rotation control end of the motor controller.
It can be understood that the purpose of this embodiment is to control the forward and reverse rotation of the drum motor, and the specific working process is as follows: when the drum motor is required to rotate positively, the control board outputs a first positive and negative rotation signal, the first positive and negative rotation signal is at a low level, as shown in fig. 4, namely, the pin 7 in fig. 4 is at a low level, and the control board does not output a second positive and negative rotation signal at a low level, so that the pin 8 is at a high level. At this time, the pin 7 is low, so the control end of the Q2 is low, the Q2 is turned on, the positive input end of the U2 is connected to high, the input end of the U2 forms a voltage drop, the output end of the U2 is turned on, i.e. the forward rotation control end (i.e. pin 0 and pin a in fig. 4) of the motor controller is turned on in short circuit, and the forward rotation of the motor is controlled.
When the roller motor is required to rotate reversely, the control board outputs a first positive reverse signal to be low level, and simultaneously outputs a second positive reverse signal to be low level, and at the moment, the 7 feet and the 8 feet are both low level; since the control terminal of Q2 is low due to the low level of pin 7, Q2 is on, but the positive input terminal of U2 is pulled low due to the connection to pin 8, and U2 is off. The positive input end of U3 is connected with the first end of Q2, and the negative input end of U3 is connected with the 8 pin through the resistor R4 and is low level, so that voltage drop is formed, U3 is conducted, the output end of U3 is conducted, namely the inversion control end (namely the 9 pin and the a pin in the figure 4) of the motor controller is conducted in a short circuit mode, and motor inversion is controlled.
According to the embodiment, the function of controlling forward and reverse rotation of the roller motor is achieved through the switch tube, the two photoelectric couplers and the plurality of resistors, in the structure, a plurality of contactors and relays are not required to be arranged, the cost is low, the wiring is simple, ignition interference caused by the relays and contactor contacts can be avoided as much as possible, and therefore the accuracy of security inspection of the security inspection machine is improved as much as possible.
As shown in fig. 4, the power control circuit further includes a second relay K2;
The coil end of the second relay K2 is connected in series between the second end of the main switch tube Q and the negative electrode of the direct current power supply, the two ends of the contact of the second relay K2 are respectively connected with the main power supply and the display of the security inspection machine, and the second relay K2 is used for controlling the on-off between the display and the main power supply.
It can be understood that the first relay K1 connected in series with the emergency stop button is used to control the on-off of the working components, so as to ensure that the working components can be powered off after the emergency stop button is pressed, and the control component and the display do not need to be powered off. This is because the situation that the emergency stop button is pressed generally mainly includes the situation that the inside of the security inspection machine may be touched by a worker, at this time, since the power source connected to the working components such as the radiation source, the drum motor, and the fan is 220V total power source, the drum motor and the fan rotate to operate, if they still operate in a live state, danger may be brought to the worker, and the display or the control component powered by the dc power source does not have the danger, therefore, in emergency, it is generally only necessary to power down the working components, so that these working components are connected to the first relay K1 controlled by the emergency stop button, and the other devices that need to be connected to the total power source, for example, the display may be connected to the second relay K2.
Of course, if the purpose of reducing the wiring and the number of devices of the security inspection machine is to be achieved, all components which need to be powered by the main power supply are connected with the first relay K1 instead of the second relay K2. The present invention is not limited to the specific mode described above.
Note that, the second relay K2 in the present invention is a normally open relay with 2-point contacts, and after the relay is energized, the two contacts are closed and conducted.
Further, it can be seen that the main switch tube Q is a MOS tube, a first auxiliary resistor R11 is connected between the source and the gate of the MOS tube, and a sixth resistor R6 is connected in series between the control end of the main switch tube Q and the first end of the first switch tube Q1.
It can be understood that the purpose of the sixth resistor R6 and the first auxiliary resistor R11 is to limit the gate voltage of the main switching transistor Q (the specific resistance is determined by the MOS transistor parameters and the operating voltage).
In a preferred embodiment, the first switching tube Q1 is a triode, and a second auxiliary resistor R12 is connected between the base and the emitter of the first switching tube Q1.
It can be appreciated that R12 improves the anti-jamming capability of the transistor, avoiding the transistor from being turned on after being disturbed.
In the preferred embodiment, a third auxiliary resistor R13 is connected between the base electrode and the emitter electrode of the second switching tube Q2 triode; a seventh resistor R7 is connected in series between the control end of the second switching tube Q2 and the fifth resistor R5.
It is understood that R7 is the base current limiting transistor. And R13 is used for reducing the input impedance of the transistor and improving the anti-interference capability of the transistor.
Preferably, the key switch is connected with the on-OFF signal input end of the control board, and sends a shutdown signal to the control board when the key switch is placed at the OFF position, and the control board delays for a preset time length and then outputs the shutdown control signal.
It can be understood that when the key switch is in the OFF position, the shutdown signal is sent to the control board, at this time, the control board will first inform the industrial personal computer to perform software shutdown, and after the execution of the soft shutdown of the industrial personal computer is completed, the control board will output the shutdown control signal to control the overall shutdown. Therefore, the control board needs to delay for a preset time length to send the shutdown control signal after receiving the shutdown signal, and the preset time length is set to be longer than the shutdown time length of the industrial personal computer software according to experience requirements.
The present invention is not limited to the above resistance values of the respective resistors and the types of the respective components.
The invention also provides a security inspection machine, which comprises a control component, a working component, a display, a plurality of emergency stop buttons and a power supply control circuit according to any one of the above; the control assembly comprises a control panel, an industrial personal computer and a sampling plate; the working assembly comprises a ray source, a roller motor and a fan. The radiation source may be an X-ray source, which is not limited in this regard.
Preferably, the control panel is connected with the emergency stop button and the display respectively, and the control panel is used for outputting a stop signal to the display after detecting that the emergency stop button is pressed; and after receiving the stop signal, the display displays a prompt triggered by the emergency stop button.
It can be understood that after the scram button is pressed, the work assembly control circuit can be powered off, so that the coil end of the first relay K1 is powered off, the contact is disconnected, and the power between the work assembly connected with the first relay K1 and the total power supply is powered off, so that the work assembly is protected. Because the work assembly of security inspection machine all outage unable work this moment, in order to make other staff can know the state that is in the scram outage now, avoid appearing misunderstanding, this embodiment can show the suggestion that scram button triggered on the display after scram button was pressed, inform the staff current working condition of security inspection machine, make things convenient for the staff to carry out security inspection management.
In addition, in order to protect the working components and the display in the security inspection machine, a protective tube and an air switch are required to be connected in series between the first relay K1 and the second relay K2 and the main power supply, so that the rear end components are prevented from being burnt out when the current or the voltage is overlarge, and the purpose of protecting the working components and the display is achieved.
The above embodiments are only preferred embodiments of the present invention, and the above embodiments may be arbitrarily combined, and the combined embodiments are also within the scope of the present invention. It should be noted that other modifications and variations to the present invention can be envisioned by those of ordinary skill in the art without departing from the spirit and scope of the present invention.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A power control circuit of a security inspection machine, comprising: the key switch, the starting button, the main switch tube, the first photoelectric coupler, the first resistor and the first relay;
The key switch is connected with the starting button in series, a first end of a circuit after the key switch is connected with the positive electrode of the direct current power supply and a first end of the main switching tube respectively, and a second end of the circuit after the key switch is connected with a control end of the first switching tube in series; the key switch is connected with an on-off signal end of a control board of the security inspection machine;
each control component of the security inspection machine and a working component series circuit are connected in parallel between the second end of the main switch tube and the negative electrode of the direct current power supply, and a coil end of the first relay and a plurality of emergency stop buttons are connected in series in the working component series circuit; the two ends of the contact of the first relay are respectively connected with a main power supply and a working assembly of the security inspection machine;
The control end of the main switching tube is respectively connected with the first end of the first switching tube and the positive input end of the first photoelectric coupler;
the second end of the first switch tube, the negative input end and the negative output end of the first photoelectric coupler are all connected with the negative end of the direct current power supply;
The positive output end of the first photoelectric coupler is connected with the first end of the first resistor, and the second end of the first resistor is respectively connected with the second end of the main switching tube and the shutdown control signal output end of the control panel; and the control board receives a shutdown signal sent when the key switch is arranged at the OFF position and outputs a shutdown control signal.
2. The power control circuit of claim 1, further comprising a second resistor;
The second end of the first resistor is directly connected with the shutdown control signal output end of the control board, and is connected with the second end of the main switch tube through the second resistor.
3. The power control circuit of claim 2, further comprising: the second switch tube, the second photoelectric coupler, the third resistor, the fourth resistor and the fifth resistor;
The first end of the second switching tube is respectively connected with the positive input end of the third photoelectric coupler and the positive input end of the second photoelectric coupler through the third resistor; the second end of the second switching tube is connected with the second end of the main switching tube;
the negative input end of the second photoelectric coupler is connected with the control end of the second switching tube and the first positive and negative rotation signal output end of the control panel through the fifth resistor respectively;
The second positive and negative rotation signal output end of the control board is respectively connected with the positive input end of the second photoelectric coupler and the negative input end of the third photoelectric coupler through the fourth resistor;
the output end of the second photoelectric coupler is connected with the forward rotation control end of the motor controller of the security inspection machine, and the output end of the third photoelectric coupler is connected with the reverse rotation control end of the motor controller.
4. A power supply control circuit according to any one of claims 1-3, further comprising a second relay;
The coil end of the second relay is connected in series between the second end of the main switch tube and the negative electrode of the direct-current power supply, two ends of a contact of the second relay are respectively connected with the main power supply and a display of the security inspection machine, and the second relay is used for controlling the on-off between the display and the main power supply.
5. A power supply control circuit according to any one of claims 1-3, wherein the main switching tube is a MOS tube, a first auxiliary resistor is connected between a source electrode and a gate electrode of the MOS tube, and a sixth resistor is connected in series between a control end of the main switching tube and a first end of the first switching tube.
6. A power control circuit according to any one of claims 1-3, wherein the first switching tube is a triode, and a second auxiliary resistor is connected between the base and the emitter of the first switching tube.
7. The power control circuit of claim 3, wherein the second switching tube is a triode, and a third auxiliary resistor is connected between the base electrode and the emitter electrode of the second switching tube; a seventh resistor is connected in series between the control end of the second switching tube and the fifth resistor.
8. The power control circuit of claim 1, wherein the key switch sends a shutdown signal to the control board when in the OFF position, and the control board delays for a predetermined length of time and outputs the shutdown control signal.
9. A security inspection machine comprising a control assembly, a working assembly, a display, a plurality of emergency stop buttons and a power control circuit as claimed in any one of claims 1 to 8;
wherein the control assembly comprises a control board; the working assembly includes a radiation source and a drum motor.
10. The security inspection machine according to claim 9, wherein the control panel is connected to the emergency stop button and the display, respectively, and the control panel is configured to output a stop signal to the display after detecting that the emergency stop button is pressed;
And after receiving the stop signal, the display displays a prompt triggered by the scram button.
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| CN201811051760.XA CN108832854B (en) | 2018-09-10 | 2018-09-10 | Security check machine and power control circuit thereof |
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| CN201811051760.XA CN108832854B (en) | 2018-09-10 | 2018-09-10 | Security check machine and power control circuit thereof |
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| CN108832854B true CN108832854B (en) | 2024-05-03 |
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| CN111162766A (en) * | 2020-01-21 | 2020-05-15 | 公安部第一研究所 | Power management system of integrated X-ray security inspection equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2007833C1 (en) * | 1989-09-29 | 1994-02-15 | Владислав Григорьевич Вохмянин | Gear for control over reversible asynchronous electric motor |
| CN103683882A (en) * | 2013-12-03 | 2014-03-26 | 天津航空机电有限公司 | Input starting current limiting circuit for switch power supply |
| CN104977623A (en) * | 2014-04-03 | 2015-10-14 | 上海高晶影像科技有限公司 | Security inspection machine system and control method therefor |
| CN205428830U (en) * | 2015-12-29 | 2016-08-03 | 上海辰竹仪表有限公司 | A starting circuit for safety relay |
| CN208939857U (en) * | 2018-09-10 | 2019-06-04 | 中控智慧科技股份有限公司 | A kind of screening machine and its power control circuit |
-
2018
- 2018-09-10 CN CN201811051760.XA patent/CN108832854B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2007833C1 (en) * | 1989-09-29 | 1994-02-15 | Владислав Григорьевич Вохмянин | Gear for control over reversible asynchronous electric motor |
| CN103683882A (en) * | 2013-12-03 | 2014-03-26 | 天津航空机电有限公司 | Input starting current limiting circuit for switch power supply |
| CN104977623A (en) * | 2014-04-03 | 2015-10-14 | 上海高晶影像科技有限公司 | Security inspection machine system and control method therefor |
| CN205428830U (en) * | 2015-12-29 | 2016-08-03 | 上海辰竹仪表有限公司 | A starting circuit for safety relay |
| CN208939857U (en) * | 2018-09-10 | 2019-06-04 | 中控智慧科技股份有限公司 | A kind of screening machine and its power control circuit |
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Address after: 523710, 26, 188 Industrial Road, Pingshan Town, Guangdong, Dongguan, Tangxia Applicant after: Entropy Technology Co.,Ltd. Address before: 523710, 26, 188 Industrial Road, Pingshan Town, Guangdong, Dongguan, Tangxia Applicant before: ZKTECO Co.,Ltd. |
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Address after: No.32, Pingshan Industrial Road, Tangxia Town, Dongguan City, Guangdong Province, 523710 Patentee after: Entropy Technology Co.,Ltd. Country or region after: China Address before: 523710 26 Pingshan 188 Industrial Avenue, Tangxia Town, Dongguan, Guangdong Patentee before: Entropy Technology Co.,Ltd. Country or region before: China |