An automatic inspection device for circuit boards of UV curing lamp heads

Abstract

This utility model discloses an automatic testing device for UV curing lamp holder circuit boards, including a testing board and a switching power supply. The testing board is equipped with a CAN communication bus that is electrically connected to and exchanges data with the lamp holder circuit board. The testing board is connected to and controls an air intake fan, UV lamp beads, and a resistance switching output module. The switching power supply provides DC power to the testing board and the lamp holder circuit board. This utility model provides test conditions and acquires test data for the lamp holder circuit board through the air intake fan, UV lamp beads, and resistance switching output module, thus eliminating the need to assemble the lamp holder circuit board into a lamp holder for actual testing, thereby improving the efficiency of lamp holder circuit board testing.

Description

Technical Field

[0001] This utility model relates to the field of mass production testing of circuit boards, specifically to an automatic testing device for circuit boards used in UV curing lamp holders. Background Technology

[0002] Currently, circuit board manufacturing processes are becoming increasingly complex, and the integration level of circuit boards is constantly improving. These processes necessitate the inspection of circuit boards to determine their functional properness. Traditional manual inspection methods suffer from low efficiency, high false negative rates, and poor consistency, making them unsuitable for the demands of modern high-precision, high-volume production. Against this backdrop, automated circuit board inspection devices have emerged.

[0003] Ultraviolet (UV) curing equipment includes a lamp head (lamp housing) for generating UV light and a controller for controlling the lamp head. The lamp head uses an internal magnetron to generate high-power radio frequency microwave energy to power the UV lamp, a technology similar to that of a microwave oven. The UV lamp head (lamp housing) contains a circuit board for real-time monitoring of its operating status. Functional testing of this circuit board is required during lamp head production. Furthermore, the lamp head's operation requires a sealed environment provided by the enclosure to maintain the required air pressure. Therefore, the assembly process of the lamp head is complex and time-consuming, resulting in low efficiency in existing methods of testing the circuit board through actual machine testing, which cannot meet the requirements of mass production and testing. Utility Model Content

[0004] The purpose of this invention is to provide an automatic testing device for UV curing lamp head circuit boards. This device provides test conditions and acquires test data for the lamp head circuit board through an air intake fan, UV lamp beads, and a resistance switching output module. This eliminates the need to assemble the lamp head circuit board into a lamp head for actual testing, thus improving the efficiency of lamp head circuit board testing.

[0005] The technical solution adopted by this utility model to solve the above problems is:

[0006] An automatic testing device for UV curing lamp head circuit boards includes a testing board and a switching power supply. The testing board is equipped with a CAN communication bus that is electrically connected to and exchanges data with the lamp head circuit board. The testing board is connected to and controls an air intake fan, UV lamp beads, and a resistance switching output module. The switching power supply is used to provide DC power to the testing board and the lamp head circuit board.

[0007] In the above technical solution, preferably, the detection board is provided with a detection circuit, which includes a main control chip, an ultraviolet lamp bead control circuit, an analog NTC resistor output circuit, an air intake fan control circuit, and a CAN bus communication circuit. The lamp head circuit board is provided with an ultraviolet light intensity sensor, an NTC sensor, and a wind pressure sensor.

[0008] In the above technical solution, preferably, the detection circuit further includes an RS485 communication circuit. The detection board is connected to a communication terminal via an RS485 bus. The RS485 communication circuit is connected to the RS485 bus, and the communication terminal is used to establish communication with the host computer.

[0009] In the above technical solution, preferably, the detection circuit further includes a device indicator light control circuit, which is connected to a red LED and a green LED.

[0010] Compared with the prior art, this utility model has the following advantages and effects:

[0011] In this invention, a switching power supply provides 24V DC power to the detection board and the lamp holder circuit board. The detection board connects to and controls an air intake fan, ultraviolet lamp beads, and a resistance switching output module to provide testing conditions for the lamp holder circuit board. The detection board then acquires the status data of the tested function of the lamp holder circuit board through a CAN communication bus, thereby realizing the detection of the lamp holder circuit board's function and confirming its status. Because this testing device can provide the lamp holder circuit board with a normal working environment and functional testing, it eliminates the need to assemble the lamp holder circuit board into a lamp holder for actual machine testing. Therefore, it can improve the efficiency of lamp holder circuit board testing and meet the requirements of mass production and testing of lamp holder circuit boards. Attached Figure Description

[0012] Figure 1 This is a structural system diagram of an automatic detection device for UV curing lamp head circuit boards according to an embodiment of the present invention.

[0013] Figure 2 yes Figure 1 Diagram of the detection circuit topology within the detection board.

[0014] Figure 3 yes Figure 1 Circuit diagram inside the detection board.

[0015] Figure 4 This is a schematic diagram of the structure of an automatic detection device for UV curing lamp head circuit boards according to an embodiment of this utility model.

[0016] The components include: 1. Detection board; 2. Switching power supply; 3. Lamp head circuit board; 4. Inhalation fan; 5. Ultraviolet lamp beads; 6. Main control chip; 7. Communication terminal; 8. Red LED; 9. Green LED; and 10. Tooling. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0018] See Figures 1-4This embodiment provides an automatic detection device for UV curing lamp head circuit boards, including a detection board 1 and a switching power supply 2. The detection board 1 is equipped with a CAN communication bus that is electrically connected to and exchanges data with the lamp head circuit board 3. The detection board 1 is connected to and controls an air intake fan 4, UV lamp beads 5, and a resistance switching output module. The switching power supply 2 is used to provide DC power to the detection board 1 and the lamp head circuit board 3.

[0019] In this invention, the switching power supply 2 provides 24V DC power to the detection board 1 and the lamp holder circuit board 3. The detection board 1 is connected to and controls the suction fan 4, the ultraviolet lamp beads 5, and the resistance switching output module to provide test conditions for the lamp holder circuit board 3. The detection board 1 then obtains the status data of the tested function of the lamp holder circuit board 3 through the CAN communication bus, thereby realizing the detection of the function of the lamp holder circuit board 3 and confirming the status of the lamp holder circuit board 3. Since this testing device can provide the lamp holder circuit board 3 with the working environment and functional testing during normal operation, it is not necessary to assemble the lamp holder circuit board 3 into a lamp holder for actual machine testing. Therefore, it can improve the efficiency of lamp holder circuit board 3 testing, meet the requirements of mass production and testing of lamp holder circuit board 3, and improve the detection accuracy compared with manual testing. It also reduces reliance on manual labor, saves labor costs in the long term, ensures consistency, avoids subjective judgment differences, and ensures that each circuit board meets the unified standard.

[0020] See Figure 2 The detection board 1 is equipped with a detection circuit, which includes a main control chip 6, an ultraviolet lamp bead control circuit, an analog NTC resistor output circuit, an air intake fan control circuit, and a CAN bus communication circuit. The lamp head circuit board 3 is equipped with an ultraviolet light intensity sensor, an NTC sensor, and a wind pressure sensor.

[0021] The main control chip 6 adjusts the brightness of the ultraviolet lamp 5 through the ultraviolet lamp control circuit, and the ultraviolet light intensity sensor is used to acquire the light intensity data of the ultraviolet lamp 5. The main control chip 6 outputs different resistance values ​​to the lamp head circuit board 3 through an analog NTC resistor output circuit to realize the function of the resistance switching module. The NTC sensor is used to acquire the operating temperature under different resistance values. In this detection device, both the detection board 1 and the lamp head circuit board 3 are installed in a sealed fixture 10 (e.g., ...). Figure 4 As shown in the figure, the suction fan 4 connects the inner and outer sides of the fixture 10. The main control chip 6 adjusts the speed of the suction fan 4 through the suction fan control circuit to control the negative pressure intensity inside the fixture 10. The negative pressure value inside the fixture 10 is detected by the wind pressure sensor.

[0022] The ultraviolet lamp 5, the resistance switching output module, and the suction fan 4 are used to provide three test conditions for the ultraviolet lamp 5 when it is working: light intensity change, temperature change, and negative pressure value change in the fixture 10. The values ​​of the three test conditions are fed back by the ultraviolet light intensity sensor, the NTC sensor, and the wind pressure sensor, and the data is transmitted to the detection board 1 through the CAN bus communication circuit.

[0023] See Figure 1 The detection circuit also includes an RS485 communication circuit. The detection board 1 is connected to a communication terminal 7 via an RS485 bus. The RS485 communication circuit is connected to the RS485 bus, and the communication terminal 7 is used to establish communication with the host computer.

[0024] Communication terminal 7 is used to establish communication between test board 1 and host computer. RS485 communication circuit and RS485 bus receive test commands from host computer. At the same time, after the functional test is completed, test results and fault information are sent back to host computer, which improves the convenience of test operation and the visualization effect of test results.

[0025] See Figure 1 The detection circuit also includes a device indicator light control circuit, which is connected to a red LED 8 and a green LED 9.

[0026] The device indicator light control circuit is used to obtain the functional test results of the lamp head circuit board 3, and then use red LED light 8 and green LED light 9 to simply indicate the test results, so that the staff can quickly identify whether the lamp head circuit board 3 is functioning normally and improve the testing efficiency.

[0027] See Figure 3 Chip U3 and its peripheral circuitry constitute a DC-DC power supply, converting the 24V DC power provided by switching power supply 2 into the +5V DC power required by detection board 1. Fuse F1 ensures timely disconnection from switching power supply 2 in case of short circuit or abnormality in detection board 1, guaranteeing system safety. U2 is an LDO converter, which, together with surrounding capacitors, converts the 5V voltage into a +3.3V voltage to supply the main control chip U1 (model STM32F103RCT6).

[0028] A green surface-mount LED indicator D1 is located near the main control chip U1. When the main control chip U1 is working, D1 flashes to indicate normal operation. The ALARM and STATUS signals control the state of the red LED 8 and green LED 9 on the junction box via transistor circuits TR1 and TR2 through connector CN1. Chip U4 (model MAX13487EE) is an RS485 bus transceiver. Together with the two indicator lights D3 and D4, D3 and D4 flash alternately during communication with the host computer, indicating that the main control chip U1 is receiving and sending data.

[0029] CN6 is a two-pin socket used to connect the suction fan 4. Q2 is a MOSFET (model NCE40P13S). The FAN_PWM signal provides an adjustable PWM wave to the gate of Q2 to drive the suction fan 4. The D8 indicator light visually displays the duty cycle of the PWM signal through its flashing frequency. The main control chip U1 adjusts the speed of the suction fan 4 by different duty cycles. The larger the duty cycle, the faster the speed of the suction fan 4 and the greater the airflow, which can create negative pressure inside the sealed fixture 10. The negative pressure value inside the fixture 10 is detected in real time by the wind pressure sensor on the lamp holder circuit board 3. By adjusting the speed of the suction fan 4, a test environment is provided for the lamp holder circuit board 3, thereby testing whether the wind pressure sensor is functioning properly.

[0030] CN19 is a four-pin socket used to connect to the NTC resistance detection function within the lamp holder circuit board 3. REL1 is a double-pole double-throw relay that, by controlling the contact to short-circuit either resistor R38 or R39, provides two different resistance values ​​to the lamp holder circuit board 3, simulating the two temperatures during NTC sensor operation.

[0031] The D12B on the detection board 1 is the ultraviolet lamp bead 5. The main control chip U1 adjusts the brightness of the ultraviolet lamp bead 5 by different duty cycles. Data of different light intensities are received by the ultraviolet light intensity sensor on the lamp head circuit board 3.

[0032] The detection board 1 integrates a CAN bus communication circuit, implemented by the bus transceiver of chip U7 (model SN65HVD251DR) and surrounding components. The data detected by the aforementioned wind pressure sensor, NTC sensor, and ultraviolet light intensity sensor are all transmitted from the lamp holder circuit board 3 to the detection board 1 via the CAN communication bus. The test results are compared with the standard data in the main control chip U1 embedded in the detection board 1 to determine whether the tested function of the lamp holder circuit board 3 is normal.

[0033] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. An apparatus for automatic detection of ultraviolet curing lamp head circuit board, characterized in that: The device includes a detection board and a switching power supply. The detection board is equipped with a CAN communication bus that is electrically connected to and exchanges data with the lamp head circuit board. The detection board is connected to and controls an air intake fan, ultraviolet lamp beads, and a resistance switching output module. The switching power supply is used to provide DC power to the detection board and the lamp head circuit board.

2. The apparatus for automatic detection of ultraviolet curing lamp head circuit board according to claim 1, characterized in that: The detection board is equipped with a detection circuit, which includes a main control chip, an ultraviolet lamp bead control circuit, an analog NTC resistor output circuit, an air intake fan control circuit, and a CAN bus communication circuit. The lamp head circuit board is equipped with an ultraviolet light intensity sensor, an NTC sensor, and a wind pressure sensor.

3. The apparatus for automatic detection of ultraviolet curing lamp head circuit board according to claim 2, characterized in that: The detection circuit also includes an RS485 communication circuit. The detection board is connected to a communication terminal via an RS485 bus. The RS485 communication circuit is connected to the RS485 bus, and the communication terminal is used to establish communication with the host computer.

4. The apparatus for automatic detection of ultraviolet curing lamp head circuit board according to claim 2, characterized in that: The detection circuit also includes a device indicator light control circuit, which is connected to a red LED and a green LED.

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