阅读说明：本技术 一种线束导通测试合格***打印装置 (Qualified seal printing device of pencil conduction test ) 是由 张平 张婉茹 韩彦亮 许婷婷 顾伟华 刘苏苏 于 2020-07-20 设计创作，主要内容包括：本发明公开了一种线束导通测试合格印章打印装置,包含支撑板、电动推杆、印章、标签挡板、光电开关和控制板,印章滑动设置在支撑板上侧,印章与电动推杆连接由电动推杆驱动在支撑板上沿水平方向来回滑动,标签挡板包含前挡板和后挡板,后挡板竖直固定在支撑板前侧并且后挡板上开有与印章匹配的通孔,前挡板固定在后挡板前侧并且与后挡板平行设置,光电开关固定在通孔一侧的后挡板上,光电开关和电动推杆分别于电路板连接。本发明通过机械结构与控制电路的结合,实现了自动打标的功能,并且具有耗时短、效率高、少加油墨的特点,进而满足线束生产检验环节的打标需求。(The invention discloses a seal printing device qualified in wiring harness conduction test, which comprises a supporting plate, an electric push rod, a seal, a label baffle plate, a photoelectric switch and a control plate, wherein the seal is arranged on the upper side of the supporting plate in a sliding manner, the seal is connected with the electric push rod and driven by the electric push rod to slide back and forth on the supporting plate along the horizontal direction, the label baffle plate comprises a front baffle plate and a rear baffle plate, the rear baffle plate is vertically fixed on the front side of the supporting plate, a through hole matched with the seal is formed in the rear baffle plate, the front baffle plate is fixed on the front side of the rear baffle plate and is arranged in parallel with the rear baffle plate, the photoelectric switch is fixed on the rear baffle plate on. The automatic marking device realizes the automatic marking function by combining the mechanical structure and the control circuit, has the characteristics of short time consumption, high efficiency and less ink addition, and further meets the marking requirement in the wire harness production inspection link.)

1. The utility model provides a qualified seal printing device of pencil conduction test which characterized in that: contain the backup pad, electric putter, the seal, the label baffle, photoelectric switch and control panel, the seal slides and sets up at the backup pad upside, the seal is connected with electric putter and is made a round trip to slide along the horizontal direction by the electric putter drive in the backup pad, the label baffle contains preceding baffle and backplate, the backplate is vertical to be fixed in the backup pad front side and the backplate go up to open have the through-hole that matches with the seal, preceding baffle is fixed in the backplate front side and with backplate parallel arrangement, photoelectric switch fixes on the backplate of through-hole one side, photoelectric switch and electric putter are connected in the circuit board respectively.

2. The wire harness continuity test-qualified stamp printing device according to claim 1, wherein: the structure that the seal slided and sets up contains seal support, slider and guide rail, and the guide rail is fixed to be set up on the up side of backup pad, and the slider setting is on the guide rail and can freely slide along the track, and the seal support is fixed at the slider upside, and the seal is fixed to be set up in the seal support, and one side of slider and electric putter's end connection are driven by electric putter, and electric putter fixes in the backup pad and with guide rail parallel arrangement.

3. The wire harness continuity test-qualified stamp printing device according to claim 1, wherein: the utility model discloses a solar battery protection device, including the backup pad, the front side both ends of backup pad are provided with two and upwards turn up the ear of rolling over of vertical direction, the both ends of backplate and roll over and open the screw that has the mutual matching on the ear, the backplate passes through bolt locking to be fixed on the ear of rolling over of backup pad front side, a photoelectric switch hole has still been opened in one side of through-hole on the backplate, photoelectric switch sets up downthehole and the photoelectric switch is fixed to be set up in the backup pad at photoelectric switch, the front bezel is L type baffle, one side edge of L type baffle sets up and is parallel with the backplate along vertical direction, the opposite side edge horizontal direction of L type baffle sets up and with backplate downside.

4. The wire harness continuity test-qualified stamp printing device according to claim 3, wherein: the photoelectric switch is a groove type photoelectric switch, and a groove of the photoelectric switch corresponds to a gap between the front baffle and the rear baffle.

5. The wire harness continuity test-qualified stamp printing device according to claim 1, wherein: the control panel level sets up in the backup pad top, and the control panel four corners is fixed in the backup pad through four fixed columns.

6. The wire harness continuity test-qualified stamp printing device according to claim 1, wherein: contain STM32 minimum system module, photoelectric switch sensor module, power conversion module and motor drive module on the control panel, photoelectric switch sensor module, power conversion module and motor drive module are connected with STM32 minimum system module respectively.

7. The wire harness continuity test-qualified stamp printing device according to claim 6, wherein: the STM32 minimum system module comprises a single chip microcomputer U1 of an STM32F103RCT6 model, a pin 42 of U1 is connected with one end of a resistor R8, the other end of the resistor R8 is connected with a pin 2 of a qualified instruction interface P2, a pin 1 of the qualified instruction interface P2 is connected with VCC12V, a pin 3 of the qualified instruction interface P2 is grounded, a pin 7 of U1 is connected with one end of a resistor R53, one end of a switch S1 and one end of a capacitor C68, the other end of the resistor R58 is connected with VCC3V3, the other end of the switch S1 and the other end of the capacitor C68 are grounded, a pin 5 of U1 is connected with one end of a crystal oscillator Y1 and one end of a capacitor C70, a pin 6 of U1 is connected with one end of a crystal oscillator Y1 and one end of.

8. The wire harness continuity test-qualified stamp printing device according to claim 7, wherein: the photoelectric switch sensor module comprises a photoelectric sensor interface P1, wherein a pin 1 of the photoelectric sensor interface P1 is connected with VCC5V and one end of a resistor R7, a pin 2 of the photoelectric sensor interface P1 is connected with the other end of a resistor R7 and a pin 15 of a U1, and a pin 3 of the photoelectric sensor interface P1 is grounded.

9. The wire harness continuity test-qualified stamp printing device according to claim 7, wherein: the motor driving module comprises a driving chip U2 of L298N, pins 2, 7 and 6 of U2 are respectively connected with pins 28, 55 and 56 of U1, pins 8, 1 and 15 of U1 are grounded, pin 9 of U1 is connected with VCC5 1, pin 4 of U1 is connected with the cathode of diode D1, the cathode of diode D1 and VCC, pin 2 of U1 is connected with the anode of diode D1, the cathode of diode D1, one end of resistor R1 and pin 2 of motor interface P1, pin 3 of U1 is connected with the anode of diode D1, the cathode of diode D1, pin 1 of motor interface P1, the cathode of light emitting diode DL1, the anode of light emitting diode DL1, the cathode of light emitting diode DL1 and the cathode of light emitting diode DL1 are connected with the other end of resistor R1, pin 13 of diode U1 is connected with the anode of diode D1, the cathode of D1, pin of diode D1 and the cathode of motor interface P1, and the anode of motor interface P1 are connected with the pin P1, and the anode, The cathode of the diode D8, the cathode of the light emitting diode DL3 and the anode of the light emitting diode DL4, the anode of the light emitting diode DL3 and the cathode of the light emitting diode DL4 are connected with the pin 1 of the motor interface P4, and the anode of the diode D5, the anode of the diode D6, the anode of the diode D7 and the anode of the diode D8 are grounded.

10. The wire harness continuity test-qualified stamp printing device according to claim 7, wherein: the power conversion module comprises a TPS54331 power IC chip U, wherein 1 pin of the U is connected with one end of a capacitor C, 2 pins of the U are connected with one end of a resistor R, one end of the capacitor C, one end of a capacitor C and VCC12, 3 pins of the U are connected with the other end of the resistor R and one end of the resistor R, 4 pins of the U are connected with one end of the capacitor C, the other end of the resistor R and the other end of the capacitor C are grounded, the other end of the resistor R is connected with one end of the resistor R and 5 pins of the U, and the other end of the resistor R is connected with an anode of a diode D, one end of the capacitor C and VCC3V One end of the capacitor C12, one end of the resistor R3 and the 7 pin of the U3 are grounded, the other end of the resistor R3 is connected with one end of the capacitor C3, and the other end of the capacitor C3 and the other end of the capacitor C12 are connected with the 6 pin of the U3.

Technical Field

The invention relates to a printing device, in particular to a stamp printing device for qualified conduction test of a wiring harness, and belongs to the field of product inspection.

Background

With the continuous soaring of Chinese economy, people have higher expectations for good life, and the ' eating and wearing ' is not a main problem which troubles people's daily life. The automobile is a common travel tool for families, and the automobile wiring harness is the venation of the automobile, is a junction for connecting various systems of the automobile, and is a carrier for transmitting electric signals. Therefore, the qualified automobile wire harness is the guarantee of the safe driving of the automobile. When an automobile assembly manufacturer receives an automobile wire harness produced by an automobile wire harness production manufacturer, whether a label of the wire harness contains a qualified printing mark is firstly checked so as to facilitate tracing of wire harness production.

The wire harness production industry is typically a labor intensive industry, with many processes dominated by manual operations. In the traditional wire harness production qualification inspection link, qualified seal is carried out manually. The waste of human resources is caused, the influence of subjective activity is important, and unqualified automobile wire harnesses are easily stamped with qualified stamps. Once the bad wiring harnesses flow into the market, potential safety hazards are easily buried for the automobile. When an automobile with a bad wire harness runs on a road, once an accident occurs, the lives and properties of people cannot be guaranteed, and tragedies of car damage and death may occur.

Disclosure of Invention

The invention aims to solve the technical problem of providing a printing device for a qualified seal of a wiring harness conduction test, which is used for automatically printing the qualified seal of the wiring harness.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the utility model provides a qualified seal printing device of pencil conduction test which characterized in that: contain the backup pad, electric putter, the seal, the label baffle, photoelectric switch and control panel, the seal slides and sets up at the backup pad upside, the seal is connected with electric putter and is made a round trip to slide along the horizontal direction by the electric putter drive in the backup pad, the label baffle contains preceding baffle and backplate, the backplate is vertical to be fixed in the backup pad front side and the backplate go up to open have the through-hole that matches with the seal, preceding baffle is fixed in the backplate front side and with backplate parallel arrangement, photoelectric switch fixes on the backplate of through-hole one side, photoelectric switch and electric putter are connected in the circuit board respectively.

Further, the structure that the seal slided and sets up contains seal support, slider and guide rail, and the guide rail is fixed to be set up on the up side of backup pad, and the slider setting is on the guide rail and can freely slide along the track, and the seal support is fixed at the slider upside, and the seal is fixed to be set up in the seal support, and one side of slider and electric putter's end connection are driven by electric putter, and electric putter fixes in the backup pad and with guide rail parallel arrangement.

Further, the front side both ends of backup pad are provided with two and upwards turn over the ear of turning up along vertical direction, open the screw that has the mutual matching on backplate's both ends and the ear of turning over, backplate passes through bolt locking to be fixed on the ear of turning over of backup pad front side, a photoelectric switch hole has still been opened in one side of through-hole on the backplate, photoelectric switch sets up downthehole and the photoelectric switch is fixed to be set up in the backup pad at photoelectric switch, preceding baffle is L type baffle, one side edge of L type baffle sets up and is parallel with the backplate along vertical direction, the opposite side edge horizontal direction of L type baffle sets up and with backplate downside fixed connection.

Furthermore, the photoelectric switch is a groove type photoelectric switch, and a gap between a groove of the photoelectric switch and the front baffle corresponds to a gap between the groove of the photoelectric switch and the rear baffle.

Furthermore, the control panel level sets up in the backup pad top, and the control panel four corners is fixed in the backup pad through four fixed columns.

Further, contain the minimum system module of STM32, photoelectric switch sensor module, power conversion module and motor drive module on the control panel, photoelectric switch sensor module, power conversion module and motor drive module are connected with the minimum system module of STM32 respectively.

Further, the minimum system module of the STM32 includes a single chip microcomputer U1 of the model STM32F103RCT6, a pin 42 of U1 is connected to one end of a resistor R8, the other end of the resistor R8 is connected to a pin 2 of a qualified command interface P2, a pin 1 of the qualified command interface P2 is connected to VCC12V, a pin 3 of the qualified command interface P2 is grounded, a pin 7 of U1 is connected to one end of a resistor R53, one end of a switch S1 and one end of a capacitor C68, the other end of the resistor R58 is connected to VCC3V3, the other end of the switch S1 and the other end of the capacitor C68 are grounded, a pin 5 of U1 is connected to one end of a crystal oscillator Y1 and one end of a capacitor C70, a pin 6 of U1 is connected to the other end of the crystal oscillator Y1 and the other.

Further, the photoelectric switch sensor module comprises a photoelectric sensor interface P1, wherein pin 1 of the photoelectric sensor interface P1 is connected with VCC5V and one end of a resistor R7, pin 2 of the photoelectric sensor interface P1 is connected with the other end of the resistor R7 and pin 15 of U1, and pin 3 of the photoelectric sensor interface P1 is grounded.

Further, the motor driving module comprises a driving chip U2 of L298N, pins 2, 7 and 6 of U2 are respectively connected with pins 28, 55 and 56 of U1, pins 8, 1 and 15 of U2 are grounded, pin 9 of U2 is connected with VCC5V, pin 4 of U2 is connected with the cathode of diode D1, the cathode of diode D2, the cathode and VCC of diode D2, pin 2 of U2 is connected with the anode of diode D2, the cathode of diode D2, one end of resistor R2 and pin 2 of motor interface P2, pin 3 of U2 is connected with the anode of diode D2, the cathode of diode D2, pin 1 of motor interface P2, the cathode of diode DL2, the anode of light emitting diode DL2 and the cathode of light emitting diode DL2 are connected with the other end of resistor R2, pin 13 of U2 is connected with the cathode of diode D2, pin P2 and the cathode of diode DL2, the pin 14 of the U2 is connected to the anode of the diode D4, the cathode of the diode D8, the cathode of the light emitting diode DL3 and the anode of the light emitting diode DL4, the anode of the light emitting diode DL3 and the cathode of the light emitting diode DL4 are connected to the pin 1 of the motor interface P4, and the anode of the diode D5, the anode of the diode D6, the anode of the diode D7 and the anode of the diode D8 are grounded.

Furthermore, the power conversion module comprises a TPS54331 power IC chip U3, a pin 1 of U3 is connected to one end of a capacitor C1, a pin 2 of U3 is connected to one end of a resistor R1, one end of a capacitor C7, one end of a capacitor C6, one end of a capacitor C5 and one end of VCC12V, a pin 3 of U3 is connected to the other end of a resistor R1 and one end of a resistor R2, a pin 4 of U3 is connected to one end of a capacitor C8, the other end of a capacitor C5, the other end of a capacitor C6, the other end of a capacitor C7, the other end of a resistor R2 and the other end of a capacitor C8 are grounded, a pin 8 of U3 is connected to the other end of a capacitor C1, a cathode of a diode D10 and one end of an inductor L1, the other end of an inductor L1 is connected to one end of a resistor R4, the first stage of a capacitor C9, one end of a capacitor C9 and the other end of a resistor R9, the other end of the resistor R6 is connected with the anode of the diode D10, one end of the capacitor C12, one end of the resistor R3 and the pin 7 of the U3 and is grounded, the other end of the resistor R3 is connected with one end of the capacitor C3, and the other end of the capacitor C3 and the other end of the capacitor C12 are connected with the pin 6 of the U3.

Compared with the prior art, the invention has the following advantages and effects: according to the automatic printing method, the automatic printing of the qualified wire harness seal is realized through the mechanical structure and the matching of the electric control board, the problems of low efficiency and waste of human resources caused by the traditional manual printing of the qualified seal are solved, the marking machine is placed in a wire harness conduction inspection link, and a test success instruction is sent to the marking machine after the conduction inspection succeeds, so that not only is one inspection process reduced, but also the problem that a bad wire harness is mistakenly printed to be qualified by manual mistake is avoided; whether the label is waited to print by the photoelectric sensor detectable exists, carry out "qualified" printing again, avoided the problem of marker mistake marking, marking machine adopts electric putter to promote the seal with whole 20N's power, the action is steady and marking machine single prints label time and is 0.67s, print time is less, efficiency is higher, qualified seal adopts the seal that has the leakproofness, solved the long-time naked hourglass of current seal in the air, printing ink is easily dry, need constantly to add the problem of china ink.

Drawings

Fig. 1 is a schematic diagram of a stamp printing apparatus for qualified conduction test of a wire harness according to the present invention.

Fig. 2 is a partial schematic view of a stamp printing apparatus for qualified conduction test of a wire harness according to the present invention.

Fig. 3 is a schematic circuit diagram of the STM32 minimal system module, the opto-electronic switch sensor module, and the motor drive module of the control board of the present invention.

Fig. 4 is a schematic circuit diagram of the power conversion module of the control board of the present invention.

Detailed Description

To elaborate on technical solutions adopted by the present invention to achieve predetermined technical objects, the technical solutions in 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, it is obvious that the described embodiments are only partial embodiments of the present invention, not all embodiments, and technical means or technical features in the embodiments of the present invention may be replaced without creative efforts, and the present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

As shown in fig. 1 and 2, the seal printing device for qualified wire harness conduction test of the invention comprises a support plate 1, an electric push rod 2, a seal 3, a label baffle, a photoelectric switch 4 and a control board 5, wherein the seal 3 is slidably arranged on the upper side of the support plate 1, the seal 3 is connected with the electric push rod 2 and is driven by the electric push rod 2 to slide back and forth on the support plate 1 along the horizontal direction, the label baffle comprises a front baffle 6 and a rear baffle 7, the rear baffle 7 is vertically fixed on the front side of the support plate 1, a through hole matched with the seal is formed in the rear baffle 7, the front baffle 6 is fixed on the front side of the rear baffle 7 and is parallel to the rear baffle 7, the photoelectric switch 4 is fixed on the rear baffle 7 on one side of the through hole, and the photoelectric switch 4 and the electric.

The structure that seal 3 slided and sets up contains seal support 8, slider 9 and guide rail 10, guide rail 10 is fixed to be set up on the last side of backup pad 1, slider 9 sets up on guide rail 10 and can freely slide along track 10, seal support 8 fixes at the slider 9 upside, seal 3 is fixed to be set up in seal support 8, one side of slider 9 and electric putter 2's end connection are driven by electric putter 2, electric putter 2 fixes on backup pad 1 and with guide rail 10 parallel arrangement. The front side both ends of backup pad 1 are provided with two and upwards turn up the ear 11 of rolling over along vertical direction, open the screw that has the mutual matching on the both ends of backplate 7 and the ear 11 of rolling over, backplate 7 passes through bolt locking to be fixed on the ear 11 of rolling over of backup pad 1 front side, a photoelectric switch hole has still been opened in one side of through-hole on the backplate 7, photoelectric switch 4 sets up downthehole and photoelectric switch 4 is fixed to be set up in backup pad 1 at photoelectric switch, preceding baffle 6 is L type baffle, one side edge of L type baffle sets up and is parallel with backplate 7 along vertical direction, the setting of other side edge horizontal direction of L type baffle and 7 downside fixed connection with the backplate. The photoelectric switch 4 is a groove type photoelectric switch, and the groove of the photoelectric switch 4 corresponds to the gap between the front baffle 6 and the rear baffle 7. When the label inserting device is used, the label is inserted into a gap between the front baffle 6 and the rear baffle 7, the lower side of the label is supported by the side edge of the front baffle in the horizontal direction, one side edge of the label is arranged in the groove of the photoelectric switch 4, and whether the label exists or not is detected through the photoelectric switch 4.

Control panel 5 level setting is in backup pad 1 top, and control panel 5 four corners is fixed on backup pad 1 through four fixed columns 12.

The input voltage of the electric push rod is 12V, the stroke is 25mm, the speed is 15mm/s, the distance from the end part of the qualified stamp to the label baffle is 5mm, so that the time for printing a label once and resetting the label is 0.67s by the marking machine, and the time requirement for printing the label in the wire harness production inspection link can be met. The qualified stamp works in a pressing mode, and the end part of the qualified stamp is formed by a push door structure and plays a role in sealing. The problem of current seal long-time naked hourglass in the air, printing ink is easily dry, need constantly add the china ink is solved. The sealing stamp can be used for 14 days by adding ink once, and can meet the requirement of printing times in a wire harness production inspection link. The marking device also has the function of automatic power-on reset after power failure, so that the problem that the push rod cannot return to the original point in the middle of the stroke due to power failure is solved.

Contain STM32 minimum system module, photoelectric switch sensor module, power conversion module and motor drive module on the control panel, photoelectric switch sensor module, power conversion module and motor drive module are connected with STM32 minimum system module respectively.

As shown in fig. 3, the STM32 minimum system module includes a single chip microcomputer U1 of the model STM32F103RCT6, a pin 42 of U1 is connected to one end of a resistor R8, the other end of the resistor R8 is connected to a pin 2 of a qualified command interface P2, a pin 1 of the qualified command interface P2 is connected to VCC12V, a pin 3 of the qualified command interface P2 is grounded, a pin 7 of U1 is connected to one end of a resistor R53, one end of a switch S1 and one end of a capacitor C68, the other end of the resistor R58 is connected to VCC3V3, the other end of the switch S1 and the other end of the capacitor C68 are grounded, a pin 5 of U1 is connected to one end of a crystal oscillator Y1 and one end of a capacitor C70, a pin 6 of U1 is connected to one end of a crystal oscillator Y1 and. The STM32 minimum system module is the core module of the circuit control board, which undertakes the tasks of data signal receiving, storing and sending, receives the signal of the sensor and realizes the driving of the electric push rod.

The photoelectric switch sensor module comprises a photoelectric sensor interface P1, wherein a pin 1 of the photoelectric sensor interface P1 is connected with VCC5V and one end of a resistor R7, a pin 2 of the photoelectric sensor interface P1 is connected with the other end of a resistor R7 and a pin 15 of a U1, and a pin 3 of the photoelectric sensor interface P1 is grounded. The photoelectric switch is of a groove type, the groove width is 3mm, and the photoelectric switch is used for detecting whether a label to be printed exists or not. When a label to be printed exists, the NPN type sensor outputs 5V, and the STM32 microcontroller can receive a high-level signal of the sensor.

The motor driving module comprises an L298N driving chip U2, pins 2, 7 and 6 of U2 are respectively connected with pins 28, 55 and 56 of U1, pins 8, 1 and 15 of U1 are grounded, pin 9 of U1 is connected with VCC5 1, pin 4 of U1 is connected with the cathode of diode D1, the cathode and VCC of diode D1, pin 2 of U1 is connected with the anode of diode D1, the cathode of diode D1, one end of resistor R1 and pin 2 of motor interface P1, pin 3 of U1 is connected with the anode of diode D1, the cathode of diode D1, pin 1 of motor interface P1, the cathode of light emitting diode DL1, the anode of light emitting diode DL1, the cathode of light emitting diode DL1 and the other end of resistor R1, pin 13 of U1 is connected with the anode of diode D1, the cathode of motor interface P1 and the cathode of light emitting diode DL1, and the pin of motor interface P1 are connected with the anode of motor interface P1, and the pin 13 of diode D1, The cathode of the diode D8, the cathode of the light emitting diode DL3 and the anode of the light emitting diode DL4, the anode of the light emitting diode DL3 and the cathode of the light emitting diode DL4 are connected with the pin 1 of the motor interface P4, and the anode of the diode D5, the anode of the diode D6, the anode of the diode D7 and the anode of the diode D8 are grounded.

Because the operating voltage of electric putter is 12V, and the operating voltage of STM32 microcontroller is 3.3V, so need power supply converting circuit to convert 12V voltage into 3.3V. The power supply conversion circuit adopts a TPS54331 power supply IC chip which is a Buck type switching power supply chip. The Buck type power supply chip has high conversion efficiency, and small conduction loss is converted in a heat energy mode, so that the phenomenon that the chip is scalded due to overhigh voltage drop is avoided. V in formula (1)_OUT(to-be-output voltage) is 3.3V, V_refThe reference voltage is 1.25V, and according to the formula, R is known₅＝3.14R₆Therefore R is₅The resistance value of (2) is 10.2k omega, R₆The resistance value of (3.24 k) omega, so that V of 3.3V can be obtained_OUTAnd outputting the voltage.

As shown in fig. 4, the power conversion module includes a TPS54331 power IC chip U3, a pin 1 of U3 is connected to one end of a capacitor C1, a pin 2 of U3 is connected to one end of a resistor R1, one end of a capacitor C7, one end of a capacitor C6, one end of a capacitor C5 and a VCC12V, a pin 3 of U3 is connected to one end of a resistor R1 and one end of a resistor R2, a pin 4 of U3 is connected to one end of a capacitor C8, the other end of a capacitor C5, the other end of a capacitor C6, the other end of a capacitor C7, the other end of a resistor R2 and the other end of a capacitor C8 are grounded, a pin 8 of U3 is connected to the other end of a capacitor C1, the cathode of a diode D10 and one end of an inductor L10, the other end of the inductor L10 is connected to one end of the resistor R10, one end of the capacitor C10 is connected to one end of the resistor R10 and the other end of the diode C10, the other end of the resistor R36, One end of the capacitor C12, one end of the resistor R3 and the 7 pin of the U3 are grounded, the other end of the resistor R3 is connected with one end of the capacitor C3, and the other end of the capacitor C3 and the other end of the capacitor C12 are connected with the 6 pin of the U3. The electric push rod adopts a 12V direct current motor, so that an L298N chip can be selected for driving, and a circuit diagram is shown as a motor driving module in figure 2. The action of the actuating mechanism of the marking machine is simple, the push rod moves linearly, and the L298N comprises 2H-bridge high-voltage large-current double full-bridge drivers which can drive the direct current motor to rotate. The STM32 microcontroller outputs TTL logic level signals to control IN1, IN2 and EN1, thereby realizing the control of the electric push rod. The marking machine realizes the function of automatic marking through the combination of a mechanical structure and a control circuit, has the characteristics of short time consumption, high efficiency and less ink addition, and further meets the marking requirement in the wire harness production inspection link.

According to the automatic printing method, the automatic printing of the qualified wire harness seal is realized through the mechanical structure and the matching of the electric control board, the problems of low efficiency and waste of human resources caused by the traditional manual printing of the qualified seal are solved, the marking machine is placed in a wire harness conduction inspection link, and a test success instruction is sent to the marking machine after the conduction inspection succeeds, so that not only is one inspection process reduced, but also the problem that a bad wire harness is mistakenly printed to be qualified by manual mistake is avoided; whether the label is waited to print by the photoelectric sensor detectable exists, carry out "qualified" printing again, avoided the problem of marker mistake marking, marking machine adopts electric putter to promote the seal with whole 20N's power, the action is steady and marking machine single prints label time and is 0.67s, print time is less, efficiency is higher, qualified seal adopts the seal that has the leakproofness, solved the long-time naked hourglass of current seal in the air, printing ink is easily dry, need constantly to add the problem of china ink.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.