Magnetic type universal motor car circuit board maintenance test workbench

Abstract

The invention relates to the technical field of circuit testing, in particular to a magnetic type universal bullet train circuit board overhauling and testing workbench which comprises a cabinet body, a signal acquisition module and a power supply module are integrally arranged in the cabinet body, wire harness windows are formed in the two sides of the cabinet body, and a groove structure is arranged on the upper surface of the cabinet body; the fixing device comprises a direction adjusting mechanism and a supporting bracket, the direction adjusting mechanism is connected in the groove structure of the cabinet body, and the other end of the direction adjusting mechanism is fixedly connected with the supporting bracket; and the magnetic type clamp comprises a first hemispherical magnet and a second hemispherical magnet, and the first hemispherical magnet and the second hemispherical magnet interact with each other to jointly clamp the circuit board. Based on systematic combination of a magnetic type universal adjustment angle of circuit board maintenance operation, a process circuit acquisition electric signal of connecting a test wire harness with a circuit board card, and a test device, the circuit board maintenance efficiency and maintenance quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of circuit testing, in particular to a magnetic universal motor vehicle circuit board inspection and testing workbench. Background Art

[0002] As the basic carrier of electronic components, the working stability of circuit boards is related to whether large electronic equipment can work normally. At present, the maintenance operation of circuit boards is roughly divided into two steps: fault handling and fault testing. Since the purposes and operations of the two steps are different, they need to be handled separately.

[0003] The existing equipment that assists in circuit board maintenance only mechanically fixes the circuit board and only plays the role of fixing the circuit board. When the circuit board is without power, maintenance operations such as welding and replacing components are performed on the circuit board. Circuit board testing equipment, on the other hand, tests the circuit board separately and collects electrical signals through the communication of the connector, so as to detect the fault status of the circuit board and achieve the purpose of repairing the circuit board. To repair the same circuit board, it is necessary to constantly switch between the maintenance equipment and the test equipment, which is not only cumbersome to operate, but also easy to damage the electronic components on the circuit board during the transfer process, resulting in low maintenance efficiency. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a magnetic universal motor vehicle circuit board maintenance and testing workbench. The present invention is based on the combination of the circuit board maintenance operation magnetic universal adjustment angle, the process circuit of the test harness connecting the circuit board card to collect electrical signals, and the test equipment, so as to improve the circuit board maintenance efficiency and maintenance quality.

[0005] The technical means adopted by the present invention are as follows:

[0006] A magnetic universal motor vehicle circuit board inspection and testing workbench, comprising:

[0007] A cabinet, wherein a signal acquisition module and a power supply module are integrated inside the cabinet, wiring harness windows are provided on both sides of the cabinet, and a groove structure is provided on the upper surface of the cabinet;

[0008] A fixing device, the fixing device comprising a direction adjustment mechanism and a support bracket, the direction adjustment mechanism is connected in the groove structure of the cabinet, and the other end is fixedly connected to the support bracket;

[0009] A magnetic clamp comprises a first hemispherical magnet and a second hemispherical magnet, wherein the first hemispherical magnet is connected to the end of the support bracket, and the first hemispherical magnet and the second hemispherical magnet interact with each other to clamp the circuit board together.

[0010] Furthermore, the outer surfaces of the magnetic fixture and the second spherical magnet are both coated with silica gel.

[0011] Furthermore, a first wiring harness and a second wiring harness are respectively led out from the wiring harness window, the first wiring harness is used to collect electrical signals in the process circuit of the circuit board during circuit testing, and the second wiring harness is used to supply power to the circuit board and the plug-ins on the circuit board.

[0012] Furthermore, a display module is also provided in the cabinet, and the display module is used to display the electrical signal collected by the signal collection module, and the signal collection module includes a voltage collection module, a current collection module and a temperature collection module.

[0013] Furthermore, the fixing device also includes a locking and limiting mechanism for maintaining the extension angle of the supporting bracket.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The magnetic universal circuit board maintenance and testing workbench designed by the present invention can realize circuit board maintenance by organically combining the front and back sides of the circuit board for testing; the signal collection of the circuit board during the circuit process is realized by directly accessing the circuit board through the device communication line; the universal rotation of the circuit board is realized through the device connection, which facilitates the testing and maintenance of the circuit board at different angles.

[0016] The test method provided by the present invention greatly improves the flexibility and comprehensiveness of circuit board maintenance. By testing the key data of the circuit board card process circuit, the accuracy of circuit board maintenance fault location is improved, the circuit board fault is quickly located, the probability of fault occurrence is reduced, and the maintenance cost and operation risk of the train are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 The present invention is a structural schematic diagram of a magnetic universal motor vehicle circuit board maintenance and testing workbench.

[0019] Figure 2 The present invention is a schematic diagram of the wiring harness connection of a magnetic universal motor vehicle circuit board maintenance and testing workbench.

[0020] Figure 3 The present invention is a schematic diagram of fixing a circuit board on a magnetic universal motor vehicle circuit board inspection and testing workbench.

[0021] In the figure: 1. cabinet; 101. wiring harness window; 102. groove structure; 201. direction adjustment mechanism; 202. support bracket; 203. locking and limiting mechanism; 204. display module; 205. power module; 3. magnetic clamp; 301. first hemisphere magnet; 302. second hemisphere magnet; 4. circuit board. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] like Figure 1 As shown, the present invention provides a magnetic universal motor vehicle circuit board maintenance and testing workbench, including: a cabinet 1, a fixing device and a magnetic fixture 3. A signal acquisition device and a power supply device are integrated inside the cabinet, and wiring harness windows 101 are provided on both sides of the cabinet, and a groove structure 102 is provided on the upper surface of the cabinet. The fixing device includes a direction adjustment mechanism 201 and a support bracket 202, and the direction adjustment mechanism 201 is used to adjust the extension direction of the support bracket 202. Preferably, the direction adjustment mechanism can adopt spherical magnets, gears, and rotating joints. In the embodiment of the present invention, the direction adjustment mechanism 201 is set to a spherical magnet. In this embodiment, the shape of the groove structure 202 is adapted to the setting of the spherical magnet, so that the spherical magnet can roll in the groove structure 202, thereby driving the extension angle of the support bracket fixedly connected to the spherical magnet.

[0025] Further preferably, the fixing device also includes a locking and limiting mechanism 203 evenly arranged in the circumference of the groove structure. In this embodiment, the locking and limiting mechanism 203 is a wedge block that can slide along the track on the upper surface of the cabinet. After the support bracket adjusts the angle through the direction adjustment mechanism 201, the spherical magnet is tightened by wedge blocks in different directions to prevent the spherical magnet and the groove structure 102 from rolling displacement again.

[0026] like Figure 3 As shown, the magnetic clamp 3 includes two hemispherical magnets that attract each other. The first hemispherical magnet 301 is fixedly connected to the end of the support bracket 202. When the first hemispherical magnet 301 and the second hemispherical magnet 302 attract each other, they can produce a stable clamping effect on the circuit board 4 in the middle.

[0027] Specifically, the first hemispherical magnet 301 and the second hemispherical magnet 302 are both made of electromagnet materials, and adopt electromagnetic force adsorption. The electromagnetic force adsorption strength is controllable. After the device is powered on, the electromagnetic force keeps the magnetic attraction of the first hemispherical magnet 301 and the second hemispherical magnet 302 in an adjustable state. When the device is left without any operation for 1 minute, the magnetic attraction reaches its strongest point, and the circuit board is in a fixed state and cannot be operated in position. The specific implementation method of electromagnetic force control is as follows:

[0028] The electromagnetic force F is usually related to the current I, the number of coil turns N, the magnetization strength of the magnet, and the geometric relationship between the coil and the magnet. Assume that the electromagnetic force is proportional to the square of the current, that is:

[0029] F=kI 2

[0030] Here, k is a constant that depends on the number of coil turns, magnet properties, and geometry.

[0031] In order to control the magnetic force generated between the two spherical magnets, it is necessary to consider controlling the current. In order to realize the circuit board clamping control function in this application, that is, the electromagnetic force can be adjusted after power-on, and if no operation is performed after a preset time, the electromagnetic force reaches the strongest. This embodiment is achieved by setting the following current I control strategy:

[0032] Initial state: After the device is powered on, an initial current I is set 0 , at this time the electromagnetic force is small, allowing the circuit board to perform position operations.

[0033] Monitoring time: Use a timer to monitor the operating status of the device. If the device has no operation (such as key pressing, touch screen touching, etc.) within 1 minute, proceed to the next step.

[0034] Adjust the current: When the device is monitored to have no operation for a preset time (the preset time is 1 minute in this implementation), the current is adjusted to the maximum value I max , at this time the electromagnetic force reaches its strongest and the circuit board is fixed.

[0035] Determine the current range: minimum current I min Should be small enough to allow easy position manipulation of the board in the initial state. Maximum current I max It should be large enough to ensure that the circuit board cannot move when it is fixed. These two current values ​​are determined by the specific circuit board structure to be inspected, and the specific method is:

[0036] Gradually increase the current and observe the movement of the board under different currents to find the minimum current I that allows the board to move easily. min .

[0037] Gradually increase the current until the circuit board is firmly fixed and cannot move. The current recorded at this time is the maximum current I max .

[0038] Record the minimum current I for the current model circuit board min and the maximum current I max , which can be directly called in the subsequent maintenance process. This avoids the disadvantage of having to re-test every time a circuit board is replaced, and improves maintenance efficiency.

[0039] In this embodiment, a control program is written to monitor the operating state of the device, time and control the magnitude of the current. A timer is set in the program, and when the timer reaches 1 minute and the device is not operated, the current regulation function is triggered.

[0040] The first hemispherical magnet 301 and the second hemispherical magnet 302 attract each other and are wrapped with a silicone variable material. The circuit board is protected from stress damage by a pressure sensor and electromagnetic force control.

[0041] As a preferred embodiment of the present invention, Figure 1 Various power modules 205 are integrated in the cabinet 1, including a power supply module, a voltage acquisition module, a current acquisition module, a temperature acquisition module and a display module.

[0042] Further preferably, in this embodiment, the circuit board is fixed by the first hemispherical magnet 301 and the second hemispherical magnet 302, and the outer surfaces of the first hemispherical magnet 301 and the second hemispherical magnet 302 are wrapped with silicone to control the magnetic suction pressure within a certain range:

[0043] By precisely adjusting the current intensity, power-on time or the magnetism of the magnets themselves, the magnetic force of the two hemispherical magnets can be carefully controlled. The magnetic force needs to be maintained within an appropriate range that can firmly adsorb the circuit board without causing any stress damage to it.

[0044] The excellent elasticity and cushioning properties of silicone can effectively absorb part of the magnetic attraction, thereby reducing the stress on the circuit board. The elastic modulus and thickness of silicone should be designed based on the size, weight and expected stress of the circuit board to ensure the best cushioning effect.

[0045] Preferably, high-precision pressure sensors are deployed on the two hemispherical magnets to monitor the pressure changes of the magnetic clamp on the circuit board in real time. Based on the instant feedback from the pressure sensor, the electromagnetic force control system dynamically adjusts the magnetic force to ensure that the pressure is always maintained within the preset safety range. The specific adjustment strategy is as follows:

[0046] First, evaluate the stress limit of the circuit board: comprehensively consider the material, structural characteristics and manufacturing process of the circuit board, and accurately determine the maximum stress value F it can withstand. m .

[0047] Secondly, set the safe pressure range: introduce the safety factor S to ensure that the circuit board is subjected to stress within the safety threshold.

[0048] The upper limit of the safety pressure range is set to F s =SF m .

[0049] Taking into account the buffering effect of silicone, the maximum allowable magnetic attraction force can be appropriately relaxed, but it is necessary to ensure that the stress on the circuit board after the silicone is deformed does not exceed F m .

[0050] Subsequently, the pressure sensor and the electromagnetic force control system are calibrated and coordinated: the pressure sensor is precisely calibrated to ensure that its readings can accurately reflect the actual pressure of the fixture on the circuit board. According to the real-time data of the pressure sensor, the output of the electromagnetic force control system is dynamically adjusted to maintain the magnetic attraction within a safe range.

[0051] Finally, a real-time monitoring and dynamic adjustment mechanism is established: During the operation of the magnetic clamp, the pressure sensor reading is continuously monitored. Once the reading exceeds the upper limit of the safe pressure range, the magnetic force is immediately reduced through the electromagnetic force control system. If the reading is lower than the preset safety lower limit (set according to actual needs), the magnetic force can be appropriately increased to ensure a stable clamping effect.

[0052] Preferably, in this embodiment, a high-precision, high-stability pressure sensor is selected to ensure the accuracy of the monitoring data. Furthermore, according to the actual size, weight and force requirements of the circuit board, the elastic modulus, thickness and shape of the silicone are carefully selected to achieve the best buffering effect. Furthermore, the magnetic clamp, pressure sensor and electromagnetic force control system are regularly maintained and inspected to ensure their stable operation and compliance with safety standards.

[0053] As a preferred embodiment of the present invention, the connection between the first hemispherical magnet 302 and the support bracket 202 can be universally rotated to realize the universal rotation of the circuit board, and the other end of the support bracket is fixedly connected to the first spherical magnet. Figure 1 The direction adjustment mechanism 201 shown can be universally rotated in the groove structure 102, and is limited by the locking limit mechanism 203 to prevent abnormal displacement, thereby adjusting the placement of the circuit board. There are 2 sets of wire harnesses on the side of the cabinet 1, and 1 set of power supply wire harnesses, which consists of 6 wire harnesses, of which 4 power supply wires (such as Figure 2 ), and the other 2 wiring harnesses are spare ( Figure 2 The other group is the signal acquisition line speed, which consists of a voltage signal acquisition harness, a current acquisition harness, and a temperature acquisition harness. Except for the temperature acquisition harness, the connection ends of the other harnesses and the circuit board are all exposed copper wires. A soldering iron can be used to connect the copper wires to the circuit board circuit to collect the circuit board detection signal. A temperature sensor is used at the end of the temperature acquisition harness that contacts the circuit board. The circuit board is fixed by the first hemispherical magnet and the second spherical magnet. According to the acquisition requirements, the circuit board can be universally rotated, and the acquisition harness is connected for circuit acquisition at any angle required by the circuit board. At the same time, the circuit board is powered so that the acquisition signal is transmitted to the display screen, and the tester can view the acquisition results of the circuit board.

[0054] The present invention designs a magnetically fixed circuit board. Through the universal rolling of the first hemispherical magnet, the circuit board can be flipped at any angle, which is convenient for testing both sides of the circuit board at the same time. The method of directly accessing the circuit board through the device communication line realizes the collection of signals (voltage signal, current signal, resistance signal and capacitance signal) in the circuit process of the circuit board. The circuit board can be universally rotated through the device connection, which is convenient for testing and repairing the circuit board at different positions and different angles.

[0055] The scheme and effect of the present invention are further described below through specific application examples. In this implementation, a magnetic universal circuit board inspection and testing workbench is used for inspection and testing according to the style of the actual circuit board to be inspected. The circuit board is inspected through system integration, which improves the operability of circuit board inspection and has data collection for circuit board inspection, and can draw preliminary conclusions and output results.

[0056] This embodiment applies the magnetic universal circuit board inspection and testing workbench to the analog circuit board inspection of the motor vehicle control circuit board YFBL225-00-04-001 (EB-PLS-26). Through the method provided by the present invention, the inspection work can be carried out quickly, saving maintenance time and cost, and improving the efficiency of the motor vehicle control circuit board inspection.

[0057] like Figure 1 As shown, the circuit board magnetic clamp 3 is equipped with a clamping circuit board 4. The clamp is composed of a magnet and silicone. The circuit board to be repaired is fixed by magnetic force. The direction adjustment mechanism 201 (a spherical magnet in this embodiment) is combined with the cabinet groove structure 102. The circuit board is fixed by the suction force of the spherical magnet and the groove. At the same time, the spherical magnet can be moved and fixed to change the direction of the circuit board. The wiring harness group 1 and the wiring harness group 2 are the circuit board signal acquisition and power supply harnesses. The signal processing components inside the cabinet are integrated to collect and process the signals and display the results on the display screen.

[0058] like Figure 2 As shown, harness group 1 is a circuit board connection harness, which is welded to the circuit board to realize the electrical signal collection in the process circuit of the circuit board. Harness group 2 is a connector power supply harness, which supplies power to the circuit board to realize the signal collection of the circuit board maintenance test.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnetic universal motor vehicle circuit board inspection and testing workbench, characterized in that: include: A cabinet, wherein a signal acquisition module and a power supply module are integrated inside the cabinet, wiring harness windows are provided on both sides of the cabinet, and a groove structure is provided on the upper surface of the cabinet; A fixing device, the fixing device comprising a direction adjustment mechanism and a support bracket, the direction adjustment mechanism is connected in the groove structure of the cabinet, and the other end is fixedly connected to the support bracket; A magnetic clamp comprises a first hemispherical magnet and a second hemispherical magnet, wherein the first hemispherical magnet is connected to the end of the support bracket, and the first hemispherical magnet and the second hemispherical magnet interact with each other to clamp the circuit board together.

2. A magnetic universal motor vehicle circuit board maintenance and testing workbench according to claim 1, characterized in that: The outer surfaces of the magnetic fixture and the second spherical magnet are both coated with silica gel.

3. A magnetic universal motor vehicle circuit board maintenance and testing workbench according to claim 1, characterized in that: The first wiring harness and the second wiring harness are respectively led out from the wiring harness window. The first wiring harness is used to collect electrical signals in the process circuit of the circuit board during circuit testing, and the second wiring harness is used to supply power to the circuit board and the plug-in on the circuit board.

4. The magnetic universal motor vehicle circuit board maintenance and testing workbench according to claim 1 is characterized in that: The cabinet is also provided with a display module, which is used to display the electrical signal collected by the signal collection module. The signal collection module includes a voltage collection module, a current collection module and a temperature collection module.

5. The magnetic universal motor vehicle circuit board inspection and testing workbench according to claim 1 is characterized in that: The fixing device also includes a locking and limiting mechanism for maintaining the extension angle of the supporting bracket.

Images