CN110308678B - Safety detection circuit, safety detection device and stamping equipment - Google Patents
Safety detection circuit, safety detection device and stamping equipment Download PDFInfo
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- CN110308678B CN110308678B CN201910507262.XA CN201910507262A CN110308678B CN 110308678 B CN110308678 B CN 110308678B CN 201910507262 A CN201910507262 A CN 201910507262A CN 110308678 B CN110308678 B CN 110308678B
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- 238000001514 detection method Methods 0.000 title claims abstract description 101
- 238000004080 punching Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 97
- 239000002184 metal Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 19
- 238000000034 method Methods 0.000 description 7
- 230000006698 induction Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
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- 230000003321 amplification Effects 0.000 description 2
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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- 238000012300 Sequence Analysis Methods 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
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- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a safety detection circuit, a safety detection device and punching equipment, which comprise: a master sensor circuit, a slave sensor circuit and a control signal output circuit electrically connected to the master sensor circuit, respectively; the slave sensor circuit is used for generating a second human body touch signal when detecting a second human body touch and outputting the second human body touch signal to the master sensor circuit; the main sensor circuit is used for generating a first human body touch signal when detecting a first human body touch, generating a two-hand touch signal according to the first human body touch signal and a received second human body touch signal and outputting the two-hand touch signal to the control signal output circuit; the control signal output circuit is used for generating a control signal according to the received double-hand touch signal and outputting the control signal to the main control circuit; the main sensor circuit generates a first pulse signal for detecting the first human body touch, and the auxiliary sensor circuit generates a second pulse signal which is in time-sharing multiplexing with the first pulse signal and is used for detecting the second human body touch according to the first pulse signal.
Description
Technical Field
The present invention relates to the field of security detection, and in particular, to a security detection circuit, a security detection device, and a stamping device.
Background
The semi-automatic miniature stamping equipment on the market at present aims at the protection device of the finger, is mainly concentrated on the periphery of a stamping workpiece and a mechanical connecting rod limiting device, and most of equipment is realized by installing a safety ring. The safety ring is installed at stamping die's periphery, considers stamping die's variety, and the safety ring is all relatively big generally, and in the in-service use in-process, when handheld work piece punching press, still must deliberately avoid the safety ring, and many workman feel that the existence of safety ring makes the operation become troublesome. Further, when a worker adds a work, the work is likely to deviate in the placement position or angle due to the safety ring. After the stamping action is started, part of workers can also have subconscious deviation of correcting the workpiece by hands, and as a result, safety accidents of fingers being injured by stamping equipment are caused. Therefore, there is a need for a safety protection device that can forcibly correct subconscious actions of a worker in a high-demand environment for safe production.
Because in the actual operation process, the sizes of the workpieces are different, the processing technology is different, the positioning requirements on the workpieces are also different, if the safety protection device is realized by adopting a mechanical switch, the workpiece is easy to shift when the positioning position of the workpiece is fixed by a worker and then the safety detection switch is pressed by hands, and the mechanical switch is pressed by the hands, so that the two hands are required to press downwards, and when the two hands are not pressed completely synchronously, the workpiece is easy to shift in positioning. Moreover, when two conventional touch detection devices are used, signals interfere with each other, thereby causing the detection system to fail to operate properly.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, workers can be easily injured by punching equipment, when a mechanical switch is used for realizing a safety protection device, the positioning of a workpiece is easy to deviate, and when two conventional touch detection devices are used, mutual interference of signals can occur.
The technical scheme adopted for solving the technical problems is as follows: a safety detection circuit is constructed, comprising: a master sensor circuit, a slave sensor circuit and a control signal output circuit electrically connected to the master sensor circuit, respectively;
The slave sensor circuit is used for generating a second human body touch signal when detecting a second human body touch and outputting the second human body touch signal to the master sensor circuit;
The main sensor circuit is used for generating a first human body touch signal when detecting a first human body touch, generating a two-hand touch signal according to the first human body touch signal and the received second human body touch signal and outputting the two-hand touch signal to the control signal output circuit;
the control signal output circuit is used for generating a control signal according to the received double-hand touch signal and outputting the control signal to the main control circuit to control the starting of the main control circuit;
The slave sensor circuit generates a second pulse signal which is multiplexed with the first pulse signal in a time-sharing manner and used for detecting a second human touch according to the first pulse signal.
Preferably, in the safety detection circuit of the present invention, the main sensor circuit includes: the device comprises a main MCU, a main touch detection circuit connected with the main MCU and a main sensor hardware circuit electrically connected with the main MCU;
The main MCU is used for generating a first pulse signal for detecting first human body touch to the main touch detection circuit and the main sensor hardware circuit, and is used for judging that the main touch detection circuit generates a first human body touch signal when detecting the first human body touch, and outputting a two-hand touch signal to the control signal output circuit according to the first human body touch signal and the received second human body touch signal;
The main touch detection circuit is used for detecting whether a first human body touches or not according to the first pulse signal and outputting a signal to the main MCU;
The master sensor hardware circuit is used for transmitting the first pulse signal to the slave sensor circuit, receiving the second human body touch signal detected by the slave sensor circuit and sending the second human body touch signal to the master MCU.
Preferably, in the safety detection circuit of the present invention, the slave sensor circuit includes: a slave MCU, a slave touch detection circuit connected to the slave MCU, and a slave sensor hardware circuit electrically connected to the slave MCU and the master sensor hardware circuit;
The slave sensor hardware circuit is used for receiving the first pulse signal sent by the master sensor hardware circuit and outputting the first pulse signal to the slave MCU, and receiving a second human touch signal output by the slave MCU and sending the second human touch signal to the master sensor hardware circuit;
The slave MCU is used for simulating and generating time which is 2 times of the pulse period T of the first pulse signal after detecting the pulse period T of the first pulse signal at least twice, generating a second pulse signal which is used for detecting a second human body touch and is in time-sharing multiplexing with the first pulse signal at a T/2 time position after the first pulse signal is started, outputting the second pulse signal to the slave touch detection circuit, and generating a second human body touch signal when judging that the slave touch detection circuit detects the second human body touch and outputting the second human body touch signal to the slave sensor hardware circuit;
the slave touch detection circuit is used for detecting whether a second human body touches or not according to the second pulse signal and outputting a signal to the slave MCU.
Preferably, in the security detection circuit of the present invention, the main touch detection circuit includes: twenty-third resistor R23, twenty-fourth resistor R24, twenty-fifth resistor R25, twenty-sixth resistor R26, twenty-seventh resistor R27, twenty-eighth resistor R28, twenty-ninth resistor R29, thirty-first resistor R30, fourteenth capacitor C14, fifteenth capacitor C15, sixteenth capacitor C16, seventeenth capacitor C17, and first operational amplifier U1;
An input end of the twenty-third resistor R23 is connected with the pin 17 of the main MCU, and receives a PWM pulse signal output by the pin 17 of the main MCU and used for detecting a first human body touch, an output end of the twenty-third resistor R23 is connected with one end of the fourteenth capacitor C14, one end of the twenty-fourth resistor R24, one end of the twenty-fifth resistor R25 and one end of the fifteenth capacitor C15, a first human body touch test port TP1 is connected with one end of the fourteenth capacitor C14, the other end of the twenty-fourth resistor R24 and the other end of the twenty-fifth resistor R25 are respectively grounded, the other end of the fifteenth capacitor C15 is connected with one end of the twenty-seventh resistor R27, one end of the twenty-sixth resistor R26 and the positive input end 1 of the first operational amplifier U1, the other end of the twenty-seventh resistor R27 is connected with 3.3V voltage, the other end of the twenty-sixth resistor R26 is grounded, the negative input end 3 of the first operational amplifier U1 is connected with one end of the twenty-ninth resistor R29 and one end of the twenty-eighth resistor R28, the negative power supply end 2 of the first operational amplifier U1 is grounded, the positive power supply end 5 of the first operational amplifier U1 is connected with 3.3V voltage and one end of the sixteenth capacitor C16, the other end of the sixteenth capacitor C16 and the other end of the twenty-ninth resistor R29 are grounded respectively, the output end 4 of the first operational amplifier U1 is connected with the other end of the twenty-eighth resistor R28 and one end of the thirty-eighth resistor R30, the other end of the thirty-eighth resistor R30 is connected with the pin 7 of the main MCU, the pin 7 of the main MCU receives signals output by the main touch detection circuit, the other end of the thirty-first resistor R30 is also connected with one end of the seventeenth capacitor C17, and the other end of the seventeenth capacitor C17 is grounded; when the main MCU judges that the first human body touch is detected according to the signal output by the main touch detection circuit, the main MCU generates a first human body touch signal;
The main sensor hardware circuit includes: a fifth transistor Q5, a sixth transistor Q6, a seventeenth resistor R17, a nineteenth resistor R19, a twenty-first resistor R20, a twenty-second resistor R21, a twenty-second resistor R22, a thirteenth capacitor C13, and a fourth terminal CN4;
An input end of the seventeenth resistor R17 is connected with a pin 17 of the main MCU, a PWM pulse signal for detecting a first human touch output from the pin 17 of the main MCU is received, an output end of the seventeenth resistor R17 is connected with a base of the fifth transistor Q5, an emitter of the fifth transistor Q5 is grounded, a collector of the fifth transistor Q5 is connected with a pin 2 of the fourth terminal CN4, a pin 2 of the fourth terminal CN4 is further connected with a pin 3 of the slave sensor hardware circuit, a PWM pulse signal for detecting a first human touch is output to a pin 3 of a third terminal CN3 of the slave sensor hardware circuit, a pin 3 of the fourth terminal CN4 is connected with a pin 2 of the third terminal CN3 of the slave sensor hardware circuit, a second human touch signal detected from the slave sensor hardware circuit is received, a collector of the fourth terminal CN4 is connected with a pin 2 of the slave sensor hardware circuit, a pin 4 is further connected with a pin 4 of the third terminal CN4, a pin 4 is further connected with a pin 12 of the third terminal CN4 of the slave sensor hardware circuit, a resistor R4 is further connected with a resistor R12 of the twenty-third terminal CN4, a resistor R4 is further connected with another end of the twenty-third terminal R12, a resistor R22 is further connected with a resistor R1 of the twenty-third terminal 12, and a twenty-third resistor R4 is connected with another end of the twenty-third resistor is connected with another end 3, and a twenty-third resistor is connected with a base of the twenty-third resistor is connected with a resistor is 12, the collector of the sixth triode Q6 is connected with the pin 9 of the main MCU, the received second human body touch signal is output to the pin 9 of the main MCU, the collector of the sixth triode Q6 is also connected with one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected with 3.3V voltage; and the main MCU generates a double-hand touch signal according to the detected first human body touch signal and the received second human body touch signal and outputs the double-hand touch signal to the control signal output circuit.
Preferably, in the safety detection circuit according to the present invention, the slave sensor hardware circuit includes: a second triode Q2, a fourth triode Q4, a twelfth capacitor C12, a second resistor R2, a third resistor R3, a fifth resistor R5, a sixth resistor R6, a fourteenth resistor R14, and a third terminal CN3;
One end of the fourteenth resistor R14 is connected with the pin 8 of the slave MCU, and receives the second human body touch signal output from the pin 8 of the slave MCU, the other end of the fourteenth resistor R14 is connected with the base of the fourth transistor Q4, the emitter of the fourth transistor Q4 is grounded, the collector of the fourth transistor Q4 is connected with the pin 2 of the third terminal CN3, the pin 2 of the third terminal CN3 outputs the second human body touch signal to the pin 3 of the fourth terminal CN4 of the master sensor hardware circuit, the pin 4 of the third terminal CN3 is connected with 12V voltage, the pin 3 of the third terminal CN3 is connected with one end of the twelfth capacitor C12, one end of the third resistor R3 and one end of the fifth resistor R5, the pin 3 of the third terminal CN3 also receives the PWM pulse signal output from the pin 2 of the fourth terminal CN4 of the master sensor hardware circuit for detecting the first human body touch, the pin CN3 is connected with the third terminal C1 and the third terminal C2 of the third transistor Q2, the pin 3 is connected with the other end of the third resistor Q2 and the other end of the third resistor Q5, the pin 3 is connected with the other end of the third resistor Q2; the slave MCU generates a PWM pulse signal for detecting the second human touch, which is formed by time-division multiplexing with the PWM pulse signal for detecting the first human touch, according to the PWM pulse signal for detecting the first human touch, and outputs the PWM pulse signal to the input end of the eighth resistor R8 of the slave touch detection circuit;
The slave touch detection circuit includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, an eighteenth resistor R18, a third capacitor C3, a fourth capacitor C4, a ninth capacitor C9, a tenth capacitor C10, and a second operational amplifier U2;
The input end of the eighth resistor R8 is connected with the pin 17 of the slave MCU, receives the PWM pulse signal output by the pin 17 of the slave MCU and used for detecting the touch of a second human body, the output end of the eighth resistor R8 is connected with one end of the third capacitor C3, one end of the tenth resistor R10, one end of the eighteenth resistor R18 and one end of the fourth capacitor C4, the second human body touch test port TP2 is connected with one end of the third capacitor C3, the other end of the tenth resistor R10 and the other end of the eighteenth resistor R18 are respectively grounded, the other end of the fourth capacitor C4 is connected with one end of the seventh resistor R7, one end of the twelfth resistor R12 and the positive input end 1 of the second operational amplifier U2, the other end of the seventh resistor R7 is connected with 3.3V voltage, the other end of the twelfth resistor R12 is grounded, the negative input end 3 of the second operational amplifier U2 is connected with one end of the thirteenth resistor R13 and one end of the eleventh resistor R11, the negative power end 2 of the second operational amplifier U2 is grounded, the positive power end 5 of the second operational amplifier U2 is connected with 3.3V voltage and one end of the tenth capacitor C10, the other end of the tenth capacitor C10 and the other end of the thirteenth resistor R13 are respectively grounded, the output end 4 of the second operational amplifier U2 is connected with the other end of the eleventh resistor R11 and one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected with the pin 7 of the slave MCU, the other end of the ninth resistor R9 is also connected with one end of the ninth capacitor C9, the slave pin 7 receives the signal output from the touch detection circuit, the other end of the ninth capacitor C9 is grounded; when the slave MCU judges that the second human body touch is detected according to the signal output by the slave touch detection circuit, the pin 8 of the slave MCU outputs the second human body touch signal to one end of the fourteenth resistor R14 of the slave sensor hardware circuit.
Preferably, in the safety detection circuit according to the present invention, the control signal output circuit includes a first resistor R1, a first transistor Q1, and a second terminal CN2;
One end of the first resistor R1 is connected with the pin 8 of the main MCU, a two-hand touch signal sent by the main sensor circuit is received, the other end of the first resistor R1 is connected with the base electrode of the first triode Q1, the emitter electrode of the first triode Q1 is grounded, the collector electrode of the first triode Q1 is connected with the pin 2 of the second terminal CN2, the pin 2 of the second terminal CN2 outputs a control signal to the control circuit, the pin 1 of the second terminal CN2 is connected with 12V voltage, and the pin 3 of the second terminal CN2 is grounded.
The invention also constructs a safety detection device which comprises the safety detection circuit, a first conductive connecting piece, a second conductive connecting piece, a first conductive container electrically connected with the main sensor circuit through the first conductive connecting piece and a second conductive container electrically connected with the auxiliary sensor circuit through the second conductive connecting piece.
Preferably, in the safety detection device of the present invention, the first conductive connecting member and the second conductive connecting member are metal springs or conductive sponges;
the master sensor circuit is arranged in the first conductive container, and the slave sensor circuit is arranged in the second conductive container;
a first human body touch test port on the main sensor circuit is contacted with the first conductive container through a metal spring or conductive sponge;
The secondary human body touch test port on the secondary sensor circuit is contacted with the second conductive container through a metal spring or conductive sponge.
The invention also constructs a stamping device, which comprises a machine base, an upper die and a lower die which are arranged on the machine base, a stamping mechanism for driving the upper die to reciprocate, and a control device for controlling the stamping mechanism to work, and is characterized by also comprising the safety detection device which is arranged on the machine base and used for detecting the safety of any one of the above-mentioned components; and the control signal output by the safety detection device is transmitted to a control circuit of the control device so as to control the stamping mechanism to work.
Preferably, in the punching apparatus of the present invention, the first conductive container and the second conductive container are located at both sides of the housing.
By implementing the invention, the safety detection circuit, the device and the stamping equipment are realized, the control signal is output only after the two sensors detect the human body touch signal, the starting of the main control circuit is controlled, the main control circuit is started only when a worker has to touch the two sensors with both hands, and the safety accident that the worker is injured by the stamping equipment with both hands is avoided, so that the real finger safety is realized, and the potential safety hazard is eliminated from a motion source.
Moreover, because human body induction detection is adopted and a mechanical switch is not adopted, the workpiece cannot be positioned and offset in the touch process.
The invention realizes the time-sharing multiplexing of the first pulse signal of the first human body touch detected by the main sensor and the second pulse signal of the second human body touch detected by the auxiliary sensor, thereby realizing the cross sampling function of the two sensors and avoiding the problem of signal crosstalk brought by the two sensors.
In addition, the first conductive container and the second conductive container are positioned on two sides of the machine base, so that the fingers of a worker are respectively placed at two different positions, and after stamping is started, the fingers can not reach the stamping die to adjust the workpiece due to the position distance, so that the finger safety is further realized.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of a security detection circuit according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a main MCU according to a first embodiment of the present invention;
FIG. 3 is a diagram of a primary touch detection circuit of a first embodiment of the invention;
FIG. 4 is a circuit diagram of a slave MCU in accordance with a first embodiment of the present invention;
FIG. 5 is a circuit diagram of a slave touch detection circuit according to a first embodiment of the invention;
FIG. 6 is a diagram of a master sensor hardware circuit and slave sensor hardware circuit according to a first embodiment of the invention;
fig. 7 is a control signal output circuit diagram of the first embodiment of the present invention;
FIG. 8 is a schematic diagram of a master-slave sensor generating PWM pulse signals and PWM pulse signals with or without touches of the master-slave sensor according to a first embodiment of the present invention;
fig. 9 is a structural view of a pressing apparatus according to a third embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
In a first embodiment, fig. 1 is a block diagram of a security detection circuit of the present invention, and as shown in fig. 1, the present invention constructs a security detection circuit including: a master sensor circuit, a slave sensor circuit and a control signal output circuit electrically connected to the master sensor circuit, respectively;
The slave sensor circuit is used for generating a second human body touch signal when detecting a second human body touch and outputting the second human body touch signal to the master sensor circuit;
the main sensor circuit is used for generating a first human body touch signal when detecting a first human body touch, generating a two-hand touch signal according to the first human body touch signal and a received second human body touch signal and outputting the two-hand touch signal to the control signal output circuit;
The control signal output circuit is used for generating a control signal according to the received double-hand touch signal and outputting the control signal to the main control circuit to control the starting of the main control circuit;
The main sensor circuit generates a first pulse signal for detecting the first human body touch, and the auxiliary sensor circuit generates a second pulse signal which is in time-sharing multiplexing with the first pulse signal and is used for detecting the second human body touch according to the first pulse signal. Specifically, the invention adopts human body induction detection, and the general human body induction detection is usually realized by a detection device through detecting the capacitance capacity of a human body, and when two induction devices are used, the mutual interference condition can occur, so that a detection system cannot work normally, therefore, the invention adopts two MCU and adopts a software method to carry out cross detection, thereby avoiding the mutual interference condition.
The main sensor circuit includes: the device comprises a main MCU, a main touch detection circuit connected with the main MCU, and a main sensor hardware circuit electrically connected with the main MCU;
The main MCU is used for generating a first pulse signal for detecting first human body touch to the main touch detection circuit and the main sensor hardware circuit, and judging that the main touch detection circuit generates a first human body touch signal when detecting the first human body touch, and outputting a double-hand touch signal to the control signal output circuit according to the first human body touch signal and the received second human body touch signal;
the main touch detection circuit is used for detecting whether a first human body touches or not according to the first pulse signal and outputting a signal to the main MCU;
and the main sensor hardware circuit is used for transmitting the first pulse signal to the slave sensor circuit, receiving the second human body touch signal detected by the slave sensor circuit and transmitting the second human body touch signal to the main MCU.
The slave sensor circuit includes: a slave MCU, a slave touch detection circuit connected with the slave MCU, and a slave sensor hardware circuit electrically connected with the slave MCU and the master sensor hardware circuit;
The slave sensor hardware circuit is used for receiving the first pulse signal sent by the master sensor hardware circuit and outputting the first pulse signal to the slave MCU, and receiving the second human touch signal output by the slave MCU and sending the second human touch signal to the master sensor hardware circuit;
The slave MCU is used for simulating and generating time which is 2 times of the pulse period T of the first pulse signal after detecting the pulse period T of the first pulse signal at least twice, generating a second pulse signal which is used for detecting the second human body touch and is formed in a time-sharing multiplexing mode with the first pulse signal at the T/2 time position after the first pulse signal is started, outputting the second pulse signal to the slave touch detection circuit, and judging that the slave touch detection circuit generates the second human body touch signal when detecting the second human body touch and outputting the second human body touch signal to the slave sensor hardware circuit;
The slave touch detection circuit is used for detecting whether a second human body touches or not according to the second pulse signal and outputting a signal to the slave MCU.
The working principle of the whole safety detection circuit is as follows: the whole process is managed by the MCU, in this system, it consists of two sensors, one master and one slave. In order to facilitate production management, the hardware circuit structures of the two sensors are consistent, and in the production process, different components are welded according to actual conditions to realize master-slave sensors. The slave sensor is mainly responsible for detecting human body touch signals, and after detecting the signals, the slave sensor transmits the signals to the master sensor through a circuit and a wire. The master sensor collects whether human body touch signals exist or not on one hand, and receives human body touch signals from the slave sensors on the other hand. When two signals exist at the same time, the signal level is output to the system of the subsequent stage.
Specifically, fig. 2 is a circuit diagram of a main MCU according to a first embodiment of the present invention, and fig. 3 is a circuit diagram of a main touch detection circuit according to a first embodiment of the present invention, as shown in fig. 2 and 3, the main touch detection circuit includes: twenty-third resistor R23, twenty-fourth resistor R24, twenty-fifth resistor R25, twenty-sixth resistor R26, twenty-seventh resistor R27, twenty-eighth resistor R28, twenty-ninth resistor R29, thirty-first resistor R30, fourteenth capacitor C14, fifteenth capacitor C15, sixteenth capacitor C16, seventeenth capacitor C17, and first operational amplifier U1;
An input end of a twenty-third resistor R23 is connected with a pin 17 of the main MCU, a PWM pulse signal which is output by the pin 17 of the main MCU and used for detecting a first human body touch is received, an output end of the twenty-third resistor R23 is connected with one end of a fourteenth capacitor C14, one end of a twenty-fourth resistor R24, one end of a twenty-fifth resistor R25 and one end of a fifteenth capacitor C15, a first human body touch test port TP1 is connected with one end of the fourteenth capacitor C14, the other end of the twenty-fourth resistor R24 and the other end of the twenty-fifth resistor R25 are respectively grounded, the other end of the fifteenth capacitor C15 is connected with one end of a twenty-seventh resistor R27, one end of a twenty-sixth resistor R26 and a positive input end 1 of a first operational amplifier U1, the other end of the twenty-seventh resistor R27 is connected with 3.3V voltage, the other end of the twenty-sixth resistor R26 is grounded, one end of the first operational amplifier U1 is connected with one end of a twenty-eighth resistor R29 and one end of a fourteenth capacitor C14, the other end of the first operational amplifier U1 is connected with the other end of the thirty-eighth resistor C3, the other end of the thirty-eighth resistor R30 is connected with the thirty-first end of the thirty-fifth resistor C1, the thirty-third resistor C1 is connected with the positive input end 1, the other end of the first operational amplifier C1 and the thirty-fifth resistor R30 is connected with the positive input end 1, the first end of the thirty-eighth resistor C1, the thirty-fifth resistor R30 is connected with the positive input end of the first resistor C1, and the output end of the thirty-eighth resistor C1, and the output end of the output 3, the output end of the thirty-eighth resistor, and the output 3, and the output end of the output signal is connected 3, and, the output, and the output, the input, and; and when the main MCU judges that the first human body touch is detected according to the signal output by the main touch detection circuit, the main MCU generates a first human body touch signal.
Fig. 6 is a diagram of a master sensor hardware circuit and a slave sensor hardware circuit according to a first embodiment of the present invention, as shown in fig. 6, the master sensor hardware circuit includes: a fifth transistor Q5, a sixth transistor Q6, a seventeenth resistor R17, a nineteenth resistor R19, a twenty-first resistor R20, a twenty-second resistor R21, a twenty-second resistor R22, a thirteenth capacitor C13, and a fourth terminal CN4;
The input end of the seventeenth resistor R17 is connected with the pin 17 of the main MCU, receives a PWM pulse signal output by the pin 17 of the main MCU and used for detecting the first human body touch, the output end of the seventeenth resistor R17 is connected with the base electrode of the fifth triode Q5, the emitter electrode of the fifth triode Q5 is grounded, the collector electrode of the fifth triode Q5 is connected with the pin 2 of the fourth terminal CN4, the pin 2 of the fourth terminal CN4 is also connected with the pin 3 of the third terminal CN3 of the slave sensor hardware circuit, outputs a PWM pulse signal used for detecting the first human body touch to the pin 3 of the third terminal CN3 of the slave sensor hardware circuit, the pin 3 of the fourth terminal CN4 is connected with the pin 2 of the third terminal CN3 of the slave sensor hardware circuit, receives a second human body touch signal detected by the slave sensor hardware circuit, the pin 4 of the fourth terminal CN4 is connected with the pin 4 of the third terminal CN3 of the slave sensor hardware circuit, the pin 4 of the fourth terminal CN4 is also connected with 12V voltage, the pin 1 of the fourth terminal CN4 is connected with the pin 1 of the third terminal CN3 of the slave sensor hardware circuit, the pin 1 of the fourth terminal CN4 is also grounded, the pin 3 of the fourth terminal CN4 is also connected with one end of a twenty-first resistor R20, one end of a thirteenth capacitor C13 and one end of a twenty-first resistor R21, the other end of the thirteenth capacitor C13 is grounded, the other end of the twenty-first resistor R20 is grounded, the other end of the twenty-first resistor R21 is connected with the base of a sixth triode Q6 and one end of a twenty-second resistor R22, the emitter of the sixth triode Q6 and the other end of the twenty-second resistor R22 are respectively grounded, the collector of the sixth triode Q6 is connected with the pin 9 of the master MCU, the received second human touch signal is output to the pin 9 of the master MCU, the collector of the sixth triode Q6 is also connected with one end of the nineteenth resistor R19, the other end of the nineteenth resistor R19 is connected with 3.3V voltage; the main MCU generates a two-hand touch signal according to the detected first human body touch signal and the received second human body touch signal and outputs the two-hand touch signal to the control signal output circuit.
Fig. 4 is a circuit diagram of a slave MCU according to the first embodiment of the present invention, and fig. 6 is a circuit diagram of a master sensor hardware circuit and a slave sensor hardware circuit according to the first embodiment of the present invention, as shown in fig. 4 and 6, the slave sensor hardware circuit includes: a second triode Q2, a fourth triode Q4, a twelfth capacitor C12, a second resistor R2, a third resistor R3, a fifth resistor R5, a sixth resistor R6, a fourteenth resistor R14, and a third terminal CN3;
One end of a fourteenth resistor R14 is connected with a pin 8 of the slave MCU, receives a second human body touch signal output from the pin 8 of the slave MCU, the other end of the fourteenth resistor R14 is connected with a base electrode of a fourth triode Q4, an emitter electrode of the fourth triode Q4 is grounded, a collector electrode of the fourth triode Q4 is connected with a pin 2 of a third terminal CN3, the pin 2 of the third terminal CN3 outputs the second human body touch signal to a pin 3 of the fourth terminal CN4 of a main sensor hardware circuit, the pin 4 of the third terminal CN3 is connected with 12V voltage, the pin 3 of the third terminal CN3 is connected with one end of a twelfth capacitor C12, one end of a third resistor R3 and one end of a fifth resistor R5, the pin 3 of the third terminal CN3 also receives PWM pulse signals output by a pin 2 of the fourth terminal CN4 of the main sensor hardware circuit and used for detecting the first human body touch, the other ends of the pin 1 of the third terminal CN3 and the other end of the twelfth capacitor C12 are respectively grounded, the other ends of the third resistor R3 are connected with 12V voltage, the other ends of the fifth resistor R5 and the other ends of the third resistor R2 are connected with the other ends of the MCU, the other ends of the third resistor R2 and the third resistor R2 are connected with the other ends of the base electrode 2; the slave MCU generates a PWM pulse signal for detecting the second human touch, which is time-division multiplexed with the PWM pulse signal for detecting the first human touch, according to the PWM pulse signal for detecting the first human touch, and outputs the PWM pulse signal to the input end of the eighth resistor R8 of the slave touch detection circuit.
Fig. 5 is a diagram of a slave touch detection circuit according to the first embodiment of the present invention, and as shown in fig. 5, the slave touch detection circuit includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, an eighteenth resistor R18, a third capacitor C3, a fourth capacitor C4, a ninth capacitor C9, a tenth capacitor C10, and a second operational amplifier U2;
An input end of an eighth resistor R8 is connected with a pin 17 of the slave MCU, a PWM pulse signal which is output from the pin 17 of the slave MCU and used for detecting a second human touch is received, an output end of the eighth resistor R8 is connected with one end of a third capacitor C3, one end of a tenth resistor R10, one end of an eighteenth resistor R18 and one end of a fourth capacitor C4, a second human touch test port TP2 is connected with one end of the third capacitor C3, the other end of the tenth resistor R10 and the other end of the eighteenth resistor R18 are respectively grounded, the other end of the fourth capacitor C4 is connected with one end of a seventh resistor R7, one end of a twelfth resistor R12 and a positive input end 1 of a second operational amplifier U2, the other end of the seventh resistor R7 is connected with 3.3V voltage, the other end of the twelfth resistor R12 is grounded, a negative input end 3 of the second operational amplifier U2 is connected with one end of a thirteenth resistor R13 and one end of an eleventh resistor R11, a negative power supply end 2 of the second operational amplifier U2 is grounded, the other end of the fourth resistor C2 is connected with a positive power supply end 2, the other end of the ninth resistor C9 is connected with the other end of the ninth resistor R9, the other end of the ninth resistor R9 is connected with the ninth resistor C9, and the other end of the ninth resistor R9 is connected with the ninth resistor R9, and the other end of the ninth resistor is connected with the ninth resistor R9; when the slave MCU judges that the second human body touch is detected according to the signal output from the touch detection circuit, the slave MCU outputs a second human body touch signal to one end of a fourteenth resistor R14 of the slave sensor hardware circuit from a pin 8 of the MCU.
Fig. 7 is a diagram of a control signal output circuit according to a first embodiment of the present invention, and as shown in fig. 7, the control signal output circuit includes a first resistor R1, a first transistor Q1, and a second terminal CN2;
One end of the first resistor R1 is connected with the pin 8 of the main MCU, a double-hand touch signal sent by the main sensor circuit is received, the other end of the first resistor R1 is connected with the base electrode of the first triode Q1, the emitter electrode of the first triode Q1 is grounded, the collector electrode of the first triode Q1 is connected with the pin 2 of the second terminal CN2, the pin 2 of the second terminal CN2 outputs a control signal to the control circuit, the pin 1 of the second terminal CN2 is connected with 12V voltage, and the pin 3 of the second terminal CN2 is grounded.
In the complete case that the master-slave touch detection circuit is not touched, taking the slave touch detection circuit as an example, a PWM pulse signal is generated from the pin 17 of the MCU chip U3, the third capacitor C3 is charged through the eighth resistor R8, the TP position on the circuit board is contacted to the metal or conductive container through a metal spring, and the capacity of the third capacitor C3 is fixed without human touch intervention, so that the electric quantity charged by each PWM pulse signal on the third capacitor C3 is basically consistent, and the voltage amplitude is basically the same, as shown in fig. 8. The ac signal is coupled to the 2 pin non-inverting input terminal of the second operational amplifier U2 through the capacitor C4, and the dc voltage at the non-inverting terminal of the second operational amplifier U2 is biased to a fixed value by the seventh resistor R7 and the twelfth resistor R12. After the signal is amplified by the second operational amplifier U2, the signal is output from the pin 4 of the second operational amplifier U2, and after RC filtering is formed by the ninth resistor R9 and the ninth capacitor C9, the signal is transmitted to the pin 7 of the slave MCU chip U3. The amplitude of the signal detected from the MCU chip U3 is fixed without intervention of human touch, so that it can be judged from the MCU chip U3 that there is no human touch.
In the case where the master-slave touch detection circuit has a touch, the slave touch detection circuit will be described as an example, and when a human body touches a metal container on which a sensor is mounted, the human body has a capacitance characteristic, contains a lot of moisture, does not belong to an insulator, and can store a certain amount of electric charge, so that the human body exhibits a capacitance characteristic. The voltage at two ends of the third capacitor C3 is changed, and when the signal processed by the second operational amplifier U2 is output to the pin 7 of the slave MCU chip U3, the amplitude of the obtained signal has a larger phase difference than that of the signal when no human body touches. The software can judge that the signal is generated by human body touch through amplitude comparison, an equivalent effect diagram obtained from the MCU chip U3 is shown in fig. 8, and fig. 8 is a schematic diagram of a PWM pulse signal generated by the master-slave sensor and a PWM pulse signal schematic diagram when the master-slave sensor is touched or not according to the first embodiment of the invention, wherein the abscissa is a period, and the ordinate is a signal amplitude value.
The main sensor hardware circuit and the auxiliary sensor hardware circuit have the same circuit structure, and the two sensors are connected by adopting a 4-core wire. As shown in fig. 6, both sensors are connected to CN3 of the slave sensor through CN4 of the master sensor, and connection wires are connected to communication signals, and the CN4 and the pins 2 and 3 of the CN3 are cross-processed. When the master sensor is used, the seventeenth resistor R17 is welded by circuit selection and connected with the fifth triode Q5, and the master sensor outputs PWM pulse signals of the master sensor to the slave sensor through the fifth triode Q5. The slave sensor synchronizes according to the PWM pulse signals of the master sensor, simulates the generation time division, and generates the own PWM pulse signals when the position T/2 of the period T of the PWM pulse signals of the master sensor is half, so that the signal intersection is realized, and the specific time sequence analysis is shown in fig. 8.
After the power-on, the master sensor is preferentially started, and the master sensor PWM pulse signal is sent to the slave sensor, and the slave sensor is in a state of waiting for the master sensor PWM pulse signal after the power-on. After the pulse period T of the PWM pulse signals of the main sensor is detected twice or more, simulating to generate time which is2 times of the pulse period T of the PWM pulse signals of the main sensor, and generating PWM pulse signals of the auxiliary sensor at the T/2 time position after the PWM pulse signals of the main sensor are started, so that time-sharing multiplexing is generated, and the cross sampling function of the two sensors is realized. That is, since the slave sensor generates the PWM pulse signal of the slave sensor at the T/2 time position, the times at which the master sensor and the slave sensor generate the pulse signal are not the same, and the slave sensor does not generate the PWM pulse signal when the master sensor generates the PWM pulse signal, thereby achieving the cross sampling. In other embodiments, after the pulse period T of the PWM pulse signal of the master sensor is detected twice or more, the time of generating the PWM pulse signal of the master sensor is simulated to be 2 times, and the time position of the PWM pulse signal of the master sensor is T/2 time after the PWM pulse signal of the master sensor is started, wherein the time of generating the PWM pulse signal of the master sensor and the time of generating the PWM pulse signal of the slave sensor are not the same, and the time of generating the PWM pulse signal of the master sensor and the time of generating the PWM pulse signal of the slave sensor are not repeated herein.
The complete detection process is as follows:
The PWM pulse signal generated by the pin 17 of the main MCU is divided into two paths, one path is supplied to the main touch detection circuit, the fourteenth capacitor C14 is charged through the twenty-third resistor R23, and the twenty-fourth resistor R24 has the effects of accelerating the discharge of the fourteenth capacitor C14, reducing the internal resistance of the TP1 position and improving the stability of signals. The twenty-fifth resistor R25 is an ESD discharge resistor for discharging human static electricity from the TP1 position and protecting the safety of the circuit. The fifteenth capacitor C15 is a signal isolation capacitor for blocking direct current and alternating current. The twenty-seventh resistor R27 and the twenty-sixth resistor R26 form a voltage division network, so that direct-current voltage bias of the first operational amplifier U1 is realized, an alternating-current signal from the fifteenth capacitor C15 is biased to a certain direct-current voltage, and signal distortion is avoided. The twenty-eighth resistor R28 and the twenty-ninth resistor R29 are amplification factor adjustment circuits of the first operational amplifier U1. The thirty-first resistor R30 and the seventeenth capacitor C17 form an RC filter circuit, the signals output by the operational amplifier are filtered, the interference of the burr signals is eliminated, and finally the signals are sent to the pin 7 of the main MCU. When a human body touches a metal container provided with a sensor, the voltage at two ends of the fourteenth capacitor C14 changes, and a signal processed by the first operational amplifier U1 is output to the pin 7 of the main MCU chip U4, so that a first human body touch signal is generated.
The other path is sent to the main sensor hardware circuit, and the PWM pulse signal passes through a seventeenth resistor R17, a third fifth diode Q5, a fourth terminal CN4 and a pin 2, and then is sent to a pin 3 of a third terminal CN3 of the slave sensor hardware circuit.
The pin 3 of the third terminal CN3 of the slave sensor hardware circuit receives the PWM pulse signal from the master sensor hardware circuit, and after being divided by the resistors R5 and R6, the PWM pulse signal is sent to the base of the second transistor Q2, and from the collector of the second transistor Q2 to the pin 9 of the slave MCU. After receiving the PWM pulse signal of the main sensor, the slave MCU simulates and generates time which is 2 times of the PWM pulse period T of the main sensor after detecting the pulse period T of the PWM pulse signal of the main sensor twice or more, and generates the PWM pulse signal of the slave sensor at the T/2 time position after the PWM pulse signal of the main sensor is started, thereby generating time-sharing multiplexing.
The 17 pin of the slave MCU generates PWM pulse signals to the slave touch detection circuit, the slave touch detection circuit charges the third capacitor C3 through the eighth resistor R8, and the tenth resistor R10 has the function of accelerating the discharge of the third capacitor C3, reducing the internal resistance of the TP position and improving the stability of signals. The eighteenth resistor R18 is an ESD discharge resistor for discharging human static electricity from TP position and protecting the safety of circuit. The fourth capacitor C4 is a signal isolation capacitor for blocking direct current and alternating current. The seventh resistor R7 and the twelfth resistor R12 form a voltage division network, so that direct-current voltage bias of the second operational amplifier U2 is realized, alternating-current signals from the fourth capacitor C4 are biased to a certain direct-current voltage, and signal distortion is avoided. The eleventh resistor R11 and the thirteenth resistor R13 are amplification factor adjustment circuits of the second operational amplifier U2. And a ninth resistor R9 and a ninth capacitor C9 form an RC filter circuit, the signals output by the operational amplifier are filtered, the interference of the burr signals is eliminated, and finally the signals are sent to a pin 7 of the slave MCU. When a human body touches a metal container provided with a sensor, the voltage at two ends of the third capacitor C3 changes, and a signal processed by the second operational amplifier U2 is output to a pin 7 of the slave MCU chip U3, so that a second human body touch signal is generated.
The second human body touch signal is output from the pin 8 of the MCU chip U3 to the slave sensor hardware circuit, is output from the collector of the fourth triode Q4 to the pin 2 of the third terminal CN3 through the fourteenth resistor R14 to the base of the fourth triode Q4, is output to the pin 3 of the fourth terminal CN4 of the master sensor hardware circuit, and then is output from the second human body touch signal detected by the sensor to the pin 9 of the master MCU through the sixth triode Q6.
After the main sensor considers that the first human body touch signal is detected and the second human body touch signal sent by the sensor is received, a double-hand touch signal is output to the control signal output circuit through the pin 8 of the main MCU, the double-hand touch signal is transmitted to the 2 nd pin of the second terminal CN2 through the base electrode of the first resistor R1 to the base electrode of the first triode Q1 and the collector electrode of the first triode Q1, then the control signal is output, and the subsequent system is informed of detecting the control signal to control the starting of the main control circuit.
In a second embodiment, the present invention also constructs a security sensing device, the security sensing circuit of any of the above, a first conductive connector, a second conductive connector, a first conductive container electrically connected to the master sensor circuit through the first conductive connector, and a second conductive container electrically connected to the slave sensor circuit through the second conductive connector.
The first conductive connecting piece and the second conductive connecting piece are metal springs or conductive sponges. The main sensor circuit is arranged in the first conductive container, the auxiliary sensor circuit is arranged in the second conductive container, and the control signal output circuit can also be arranged in the first conductive container or the second conductive container or on the main circuit board; a first human body touch test port on the main sensor circuit is contacted with a first conductive container through a metal spring or conductive sponge; the second human body touch test port on the sensor circuit is contacted to the second conductive container through a metal spring or conductive sponge. Specifically, even if the conductive container is offset, the elasticity of the metal spring or the conductive sponge can be utilized to ensure the electrical connection between the conductive container and the touch test port, and in other embodiments, the first conductive connecting piece and the second conductive connecting piece may be other metals or conductive connecting pieces, which are not described herein.
In a third embodiment, fig. 9 is a structural view of a press apparatus according to a third embodiment of the present invention, and as shown in fig. 9, the present invention also constructs a press apparatus including a housing 7, an upper die 6 and a lower die 5 mounted on the housing 7, a press mechanism 4 for driving the upper die 5 to reciprocate, and a control device 3 for controlling the operation of the press mechanism 4, the press apparatus further including a safety detection device of any one of the above described, provided on the housing 7; the control signal output by the safety detection device is transmitted to a control circuit of the control device 3 to control the stamping mechanism 4 to work. And preferably, the first conductive container 1 and the second conductive container 2 are positioned at two sides of the stand, and the first conductive container 1 and the second conductive container 2 are metal spheres or semi-spheres. The invention adopts a method for installing two finger detection devices at the bottom of the stamping and forces a worker to position the fingers, so as to realize that the fingers of the worker are respectively placed at two different positions, and after the stamping is started, the fingers can not reach the stamping die to adjust the workpiece due to the position distance, thereby realizing real finger safety and eliminating potential safety hazards from a source.
By implementing the invention, the safety detection circuit, the device and the stamping equipment are realized, the control signal is output only after the two sensors detect the human body touch signal, the starting of the main control circuit is controlled, the main control circuit is started only when a worker has to touch the two sensors with both hands, and the safety accident that the worker is injured by the stamping equipment with both hands is avoided, so that the real finger safety is realized, and the potential safety hazard is eliminated from a motion source.
Moreover, because human body induction detection is adopted and a mechanical switch is not adopted, the workpiece cannot be positioned and offset in the touch process.
The invention realizes the time-sharing multiplexing of the first pulse signal of the first human body touch detected by the main sensor and the second pulse signal of the second human body touch detected by the auxiliary sensor, thereby realizing the cross sampling function of the two sensors and avoiding the problem of signal crosstalk brought by the two sensors.
In addition, the first conductive container and the second conductive container are positioned on two sides of the machine base, so that the fingers of a worker are respectively placed at two different positions, and after stamping is started, the fingers can not reach the stamping die to adjust the workpiece due to the position distance, so that the finger safety is further realized.
While the invention has been described with reference to the specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A security detection circuit, comprising: a master sensor circuit, a slave sensor circuit and a control signal output circuit electrically connected to the master sensor circuit, respectively;
The slave sensor circuit is used for generating a second human body touch signal when detecting a second human body touch and outputting the second human body touch signal to the master sensor circuit;
The main sensor circuit is used for generating a first human body touch signal when detecting a first human body touch, generating a two-hand touch signal according to the first human body touch signal and the received second human body touch signal and outputting the two-hand touch signal to the control signal output circuit;
the control signal output circuit is used for generating a control signal according to the received double-hand touch signal and outputting the control signal to the main control circuit to control the starting of the main control circuit;
The slave sensor circuit generates a second pulse signal which is multiplexed with the first pulse signal in a time-sharing manner and is used for detecting a second human touch according to the first pulse signal;
Wherein the primary sensor circuit comprises: the device comprises a main MCU, a main touch detection circuit connected with the main MCU and a main sensor hardware circuit electrically connected with the main MCU;
The main MCU is used for generating a first pulse signal for detecting first human body touch to the main touch detection circuit and the main sensor hardware circuit, and is used for judging that the main touch detection circuit generates a first human body touch signal when detecting the first human body touch, and outputting a two-hand touch signal to the control signal output circuit according to the first human body touch signal and the received second human body touch signal;
The main touch detection circuit is used for detecting whether a first human body touches or not according to the first pulse signal and outputting a signal to the main MCU;
The master sensor hardware circuit is used for transmitting the first pulse signal to the slave sensor circuit, receiving a second human body touch signal detected by the slave sensor circuit and transmitting the second human body touch signal to the master MCU;
the slave sensor circuit includes: a slave MCU, a slave touch detection circuit connected to the slave MCU, and a slave sensor hardware circuit electrically connected to the slave MCU and the master sensor hardware circuit;
The slave sensor hardware circuit is used for receiving the first pulse signal sent by the master sensor hardware circuit and outputting the first pulse signal to the slave MCU, and receiving a second human touch signal output by the slave MCU and sending the second human touch signal to the master sensor hardware circuit;
The slave MCU is used for simulating and generating time which is 2 times of the pulse period T of the first pulse signal after detecting the pulse period T of the first pulse signal at least twice, generating a second pulse signal which is used for detecting a second human body touch and is in time-sharing multiplexing with the first pulse signal at a T/2 time position after the first pulse signal is started, outputting the second pulse signal to the slave touch detection circuit, and generating a second human body touch signal when judging that the slave touch detection circuit detects the second human body touch and outputting the second human body touch signal to the slave sensor hardware circuit;
The slave touch detection circuit is used for detecting whether a second human body touches or not according to the second pulse signal and outputting a signal to the slave MCU;
The control signal output circuit comprises a first resistor R1, a first triode Q1 and a second terminal CN2;
One end of the first resistor R1 is connected with the pin 8 of the main MCU, a two-hand touch signal sent by the main sensor circuit is received, the other end of the first resistor R1 is connected with the base electrode of the first triode Q1, the emitter electrode of the first triode Q1 is grounded, the collector electrode of the first triode Q1 is connected with the pin 2 of the second terminal CN2, the pin 2 of the second terminal CN2 outputs a control signal to the control circuit, the pin 1 of the second terminal CN2 is connected with 12V voltage, and the pin 3 of the second terminal CN2 is grounded.
2. The security detection circuit of claim 1 wherein the primary touch detection circuit comprises: twenty-third resistor R23, twenty-fourth resistor R24, twenty-fifth resistor R25, twenty-sixth resistor R26, twenty-seventh resistor R27, twenty-eighth resistor R28, twenty-ninth resistor R29, thirty-first resistor R30, fourteenth capacitor C14, fifteenth capacitor C15, sixteenth capacitor C16, seventeenth capacitor C17, and first operational amplifier U1;
An input end of the twenty-third resistor R23 is connected with the pin 17 of the main MCU, and receives a PWM pulse signal output by the pin 17 of the main MCU and used for detecting a first human body touch, an output end of the twenty-third resistor R23 is connected with one end of the fourteenth capacitor C14, one end of the twenty-fourth resistor R24, one end of the twenty-fifth resistor R25 and one end of the fifteenth capacitor C15, a first human body touch test port TP1 is connected with one end of the fourteenth capacitor C14, the other end of the twenty-fourth resistor R24 and the other end of the twenty-fifth resistor R25 are respectively grounded, the other end of the fifteenth capacitor C15 is connected with one end of the twenty-seventh resistor R27, one end of the twenty-sixth resistor R26 and the positive input end 1 of the first operational amplifier U1, the other end of the twenty-seventh resistor R27 is connected with 3.3V voltage, the other end of the twenty-sixth resistor R26 is grounded, the negative input end 3 of the first operational amplifier U1 is connected with one end of the twenty-ninth resistor R29 and one end of the twenty-eighth resistor R28, the negative power supply end 2 of the first operational amplifier U1 is grounded, the positive power supply end 5 of the first operational amplifier U1 is connected with 3.3V voltage and one end of the sixteenth capacitor C16, the other end of the sixteenth capacitor C16 and the other end of the twenty-ninth resistor R29 are grounded respectively, the output end 4 of the first operational amplifier U1 is connected with the other end of the twenty-eighth resistor R28 and one end of the thirty-eighth resistor R30, the other end of the thirty-eighth resistor R30 is connected with the pin 7 of the main MCU, the pin 7 of the main MCU receives signals output by the main touch detection circuit, the other end of the thirty-first resistor R30 is also connected with one end of the seventeenth capacitor C17, and the other end of the seventeenth capacitor C17 is grounded; when the main MCU judges that the first human body touch is detected according to the signal output by the main touch detection circuit, the main MCU generates a first human body touch signal;
The main sensor hardware circuit includes: a fifth transistor Q5, a sixth transistor Q6, a seventeenth resistor R17, a nineteenth resistor R19, a twenty-first resistor R20, a twenty-second resistor R21, a twenty-second resistor R22, a thirteenth capacitor C13, and a fourth terminal CN4;
An input end of the seventeenth resistor R17 is connected with a pin 17 of the main MCU, a PWM pulse signal for detecting a first human touch output from the pin 17 of the main MCU is received, an output end of the seventeenth resistor R17 is connected with a base of the fifth transistor Q5, an emitter of the fifth transistor Q5 is grounded, a collector of the fifth transistor Q5 is connected with a pin 2 of the fourth terminal CN4, a pin 2 of the fourth terminal CN4 is further connected with a pin 3 of the slave sensor hardware circuit, a PWM pulse signal for detecting a first human touch is output to a pin 3 of a third terminal CN3 of the slave sensor hardware circuit, a pin 3 of the fourth terminal CN4 is connected with a pin 2 of the third terminal CN3 of the slave sensor hardware circuit, a second human touch signal detected from the slave sensor hardware circuit is received, a collector of the fourth terminal CN4 is connected with a pin 2 of the slave sensor hardware circuit, a pin 4 is further connected with a pin 4 of the third terminal CN4, a pin 4 is further connected with a pin 12 of the third terminal CN4 of the slave sensor hardware circuit, a resistor R4 is further connected with a resistor R12 of the twenty-third terminal CN4, a resistor R4 is further connected with another end of the twenty-third terminal R12, a resistor R22 is further connected with a resistor R1 of the twenty-third terminal 12, and a twenty-third resistor R4 is connected with another end of the twenty-third resistor is connected with another end 3, and a twenty-third resistor is connected with a base of the twenty-third resistor is connected with a resistor is 12, the collector of the sixth triode Q6 is connected with the pin 9 of the main MCU, the received second human body touch signal is output to the pin 9 of the main MCU, the collector of the sixth triode Q6 is also connected with one end of the nineteenth resistor R19, and the other end of the nineteenth resistor R19 is connected with 3.3V voltage; and the main MCU generates a double-hand touch signal according to the detected first human body touch signal and the received second human body touch signal and outputs the double-hand touch signal to the control signal output circuit.
3. The security detection circuit of claim 2, wherein the slave sensor hardware circuit comprises: a second triode Q2, a fourth triode Q4, a twelfth capacitor C12, a second resistor R2, a third resistor R3, a fifth resistor R5, a sixth resistor R6, a fourteenth resistor R14, and a third terminal CN3;
One end of the fourteenth resistor R14 is connected with the pin 8 of the slave MCU, and receives the second human body touch signal output from the pin 8 of the slave MCU, the other end of the fourteenth resistor R14 is connected with the base of the fourth transistor Q4, the emitter of the fourth transistor Q4 is grounded, the collector of the fourth transistor Q4 is connected with the pin 2 of the third terminal CN3, the pin 2 of the third terminal CN3 outputs the second human body touch signal to the pin 3 of the fourth terminal CN4 of the master sensor hardware circuit, the pin 4 of the third terminal CN3 is connected with 12V voltage, the pin 3 of the third terminal CN3 is connected with one end of the twelfth capacitor C12, one end of the third resistor R3 and one end of the fifth resistor R5, the pin 3 of the third terminal CN3 also receives the PWM pulse signal output from the pin 2 of the fourth terminal CN4 of the master sensor hardware circuit for detecting the first human body touch, the pin CN3 is connected with the third terminal C1 and the third terminal C2 of the third transistor Q2, the pin 3 is connected with the other end of the third resistor Q2 and the other end of the third resistor Q5, the pin 3 is connected with the other end of the third resistor Q2; the slave MCU generates a PWM pulse signal for detecting the second human touch, which is formed by time-division multiplexing with the PWM pulse signal for detecting the first human touch, according to the PWM pulse signal for detecting the first human touch, and outputs the PWM pulse signal to the input end of an eighth resistor R8 of the slave touch detection circuit;
The slave touch detection circuit includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, an eighteenth resistor R18, a third capacitor C3, a fourth capacitor C4, a ninth capacitor C9, a tenth capacitor C10, and a second operational amplifier U2;
The input end of the eighth resistor R8 is connected with the pin 17 of the slave MCU, receives the PWM pulse signal output by the pin 17 of the slave MCU and used for detecting the touch of a second human body, the output end of the eighth resistor R8 is connected with one end of the third capacitor C3, one end of the tenth resistor R10, one end of the eighteenth resistor R18 and one end of the fourth capacitor C4, the second human body touch test port TP2 is connected with one end of the third capacitor C3, the other end of the tenth resistor R10 and the other end of the eighteenth resistor R18 are respectively grounded, the other end of the fourth capacitor C4 is connected with one end of the seventh resistor R7, one end of the twelfth resistor R12 and the positive input end 1 of the second operational amplifier U2, the other end of the seventh resistor R7 is connected with 3.3V voltage, the other end of the twelfth resistor R12 is grounded, the negative input end 3 of the second operational amplifier U2 is connected with one end of the thirteenth resistor R13 and one end of the eleventh resistor R11, the negative power end 2 of the second operational amplifier U2 is grounded, the positive power end 5 of the second operational amplifier U2 is connected with 3.3V voltage and one end of the tenth capacitor C10, the other end of the tenth capacitor C10 and the other end of the thirteenth resistor R13 are respectively grounded, the output end 4 of the second operational amplifier U2 is connected with the other end of the eleventh resistor R11 and one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected with the pin 7 of the slave MCU, the other end of the ninth resistor R9 is also connected with one end of the ninth capacitor C9, the slave pin 7 receives the signal output from the touch detection circuit, the other end of the ninth capacitor C9 is grounded; when the slave MCU judges that the second human body touch is detected according to the signal output by the slave touch detection circuit, the pin 8 of the slave MCU outputs the second human body touch signal to one end of the fourteenth resistor R14 of the slave sensor hardware circuit.
4. A safety device comprising the safety detection circuit of any one of claims 1-3, a first conductive connector, a second conductive connector, a first conductive container electrically connected to the master sensor circuit via the first conductive connector, and a second conductive container electrically connected to the slave sensor circuit via the second conductive connector.
5. The security sensing device of claim 4 wherein the first and second conductive connectors are metal springs or conductive sponges;
the master sensor circuit is arranged in the first conductive container, and the slave sensor circuit is arranged in the second conductive container;
a first human body touch test port on the main sensor circuit is contacted with the first conductive container through a metal spring or conductive sponge;
The secondary human body touch test port on the secondary sensor circuit is contacted with the second conductive container through a metal spring or conductive sponge.
6. Punching equipment comprising a base (7), an upper die (5) and a lower die (6) which are arranged on the base (7), a punching mechanism (4) which drives the upper die (5) to reciprocate, and a control device (3) which controls the punching mechanism (4) to work, and the equipment is characterized by further comprising the safety detection device which is arranged on the base (7) and is defined in any one of claims 4 to 5; and a control signal output by the safety detection device is transmitted to a control circuit of the control device (3) so as to control the stamping mechanism (4) to work.
7. Stamping apparatus according to claim 6, characterized in that the first conductive container (1) and the second conductive container (2) are located on both sides of the housing (7).
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