CN219695361U - Circuit board detection equipment - Google Patents
Circuit board detection equipment Download PDFInfo
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- CN219695361U CN219695361U CN202321037756.4U CN202321037756U CN219695361U CN 219695361 U CN219695361 U CN 219695361U CN 202321037756 U CN202321037756 U CN 202321037756U CN 219695361 U CN219695361 U CN 219695361U
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Abstract
The utility model relates to the field of detection equipment, in particular to detection equipment for a circuit board, which comprises an equipment main body and a circuit board jig which is arranged on the equipment main body and is electrically connected with the equipment main body, wherein the circuit board jig is used for being electrically connected with a circuit board to be detected, the equipment main body comprises a constant voltage source module, a first display module and a second display module, the constant voltage source module is used for acquiring a high-level load signal and converting the high-level load signal into a low-level load signal, the low-level load signal is used for being transmitted to the circuit board to be detected, the first display module is used for displaying the low-level load signal, and the second display module is used for being electrically connected with the circuit board to be detected and displaying detection signals. According to the utility model, the circuit board fixture is electrically connected with the circuit board to be detected, so that the detection efficiency is improved, the constant voltage source module converts a high-level load signal into a low-level load signal, the detection safety is improved, and the defects existing in the circuit board detection process are overcome.
Description
Technical Field
The utility model relates to the field of detection equipment, in particular to detection equipment for a circuit board.
Background
The circuit board typically has various electronic components mounted thereon and provides electrical circuitry to complete the various electronic components. The circuit board is detected to find out the defects of the circuit board, so as to ensure the quality of the circuit board and improve the qualification rate of products, and the detection method of the circuit board can be divided into: electrical detection and visual detection. The circuit board is required to be tested in a loading way when the circuit board is electrically detected, and at present, the circuit board is required to be tested in a current and voltage mode after the output end of the welding machine is connected with a load box, wires are required to be frequently replaced in the detection process, and the output end of the welding machine outputs large current and high voltage, so that potential safety hazards exist in the test process.
Disclosure of Invention
In order to improve defects existing in the detection process of the circuit board, the utility model provides detection equipment of the circuit board.
The utility model provides a detection device for a circuit board, which adopts the following technical scheme:
the utility model provides a check out test set of circuit board, including the equipment main part with install in on the equipment main part, and with the circuit board tool that equipment main part electricity is connected, circuit board tool is used for being connected with the circuit board that awaits measuring, the equipment main part is including constant voltage source module, first display module and second display module, constant voltage source module is used for acquireing high-level load signal, will high-level load signal converts low-level load signal into, low-level load signal is used for carrying to the circuit board that awaits measuring, first display module is used for showing low-level load signal, second display module is used for being connected with the circuit board electricity that awaits measuring, shows detection signal.
Through adopting above-mentioned technical scheme, when detecting the circuit board that awaits measuring, install the circuit board that awaits measuring on the circuit board tool, circuit board tool and circuit board electricity that awaits measuring are connected to realize that the circuit board that awaits measuring is connected with the check out test set electricity. The low-level load signal output by the constant voltage source module is input to the circuit board to be tested, PI adjustment is carried out on the circuit board to be tested, after the pulse width of the driving wave is narrowed, the second display module receives the detection signal and displays the detection signal, when the output detection signal is consistent with the low-level load signal displayed by the first display module, the circuit board is qualified, and when the output detection signal is inconsistent with the low-level load signal, the circuit board is unqualified.
In conclusion, through circuit board tool and circuit board electricity connection that awaits measuring, improved detection efficiency, constant voltage source module converts the load signal of high level into the load signal of low level, has improved the security of detection.
Optionally, the low-level load signal includes a first signal and a second signal, the constant voltage source module includes a first output unit and a second output unit, an input end of the first output unit is used for obtaining the high-level load signal, an output end of the first output unit is used for outputting the first signal, an input end of the second output unit is connected to an output end of the first output unit, and is used for obtaining the first signal, and an output end of the second output unit is used for outputting the second signal.
Through adopting above-mentioned technical scheme, the constant voltage source module outputs the load signal of two low levels of first signal and second signal, when detecting, firstly with one of them signal input to the circuit board that awaits measuring, carry out voltage calibration to equipment and circuit board that awaits measuring for the load signal of low level that first display module shows is unanimous with the detected signal that second display module shows, selects another signal to input in the circuit board that awaits measuring again, observes whether the load signal of low level that this moment first display module shows is unanimous with the detected signal that second display module shows, in order to reach the effect of detection verification, has improved the accuracy of testing result.
Optionally, the first output unit includes:
the first voltage dividing circuit is used for outputting a first voltage dividing signal and comprises a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the input end of the first voltage dividing resistor R1 is used for acquiring the high-level load signal, and a first voltage dividing signal output point is formed between the first voltage dividing resistor R1 and the second voltage dividing resistor R2;
the first voltage stabilizing circuit comprises a first operational amplifier OA1, wherein the non-inverting input end of the first operational amplifier OA1 is used for obtaining the first divided voltage signal from the first divided voltage signal output point, the output end of the first operational amplifier OA1 is used for outputting the first signal, and the inverting input end of the first operational amplifier OA1 is used for obtaining the first signal.
Through adopting above-mentioned technical scheme, after the first bleeder circuit obtained high-level load signal, through the partial pressure of first bleeder resistor R1 and second bleeder resistor R2, realized the step-down to high-level load signal to output first bleeder signal, first bleeder signal is obtained to first operational amplifier OA 1's homophase input, output first signal, reverse input link to first operational amplifier OA 1's output as first voltage stabilizing circuit's negative feedback part.
Optionally, the second output unit includes:
the second voltage dividing circuit is used for outputting a second voltage dividing signal and comprises a third voltage dividing resistor R4 and a fourth voltage dividing resistor R5, the input end of the third voltage dividing resistor R4 is used for acquiring a first signal, and a second voltage dividing signal output point is formed between the third voltage dividing resistor R4 and the fourth voltage dividing resistor R5;
the second voltage stabilizing circuit comprises a second operational amplifier OA2, wherein the non-inverting input end of the second operational amplifier OA2 is used for obtaining the second voltage division signal from the second voltage division signal output point, the output end of the second operational amplifier OA2 is used for outputting a second signal, and the inverting input end of the second operational amplifier OA2 is used for obtaining the second signal.
By adopting the technical scheme, the second voltage dividing circuit obtains the first signal, voltage reduction of the first signal is achieved through voltage division of the third voltage dividing resistor R4 and the fourth voltage dividing resistor R5, the second voltage dividing signal is output, the in-phase input end of the second operational amplifier OA2 obtains the second voltage dividing signal, the output end outputs the second signal, and the reverse input end is connected with the output end of the second operational amplifier OA2 to serve as a negative feedback part of the second voltage stabilizing circuit.
Optionally, the device further comprises a calibration module, and the calibration module comprises:
the input end of the voltage regulating circuit is used for being connected with the circuit board to be tested, the output end of the voltage regulating circuit is used for outputting a voltage regulating signal, the voltage regulating circuit comprises a first adjustable rheostat RP1 and a fifth voltage dividing resistor R8, and a voltage regulating signal output point is formed between the first adjustable rheostat RP1 and the fifth voltage dividing resistor R8;
the calibration voltage stabilizing circuit is used for outputting detection signals and comprises a third operational amplifier OA3, wherein the non-inverting input end of the third operational amplifier OA3 is used for acquiring the voltage regulating signals from the voltage regulating signal output point, the output end of the third operational amplifier OA3 is used for outputting detection signals, and the inverting input end of the third operational amplifier OA3 is used for acquiring the detection signals.
Through adopting above-mentioned technical scheme, during the detection, select first signal and second signal one of them to input to the circuit board that awaits measuring earlier, carry out voltage calibration to equipment and circuit board that awaits measuring, when the low level load signal that first display module shows and the detection signal that second display module shows are inconsistent, adjust first adjustable varistor RP1 for the detection signal that second display module shows is unanimous with the low level load signal that first display module shows.
Optionally, the device main body further comprises a switch module, the switch module comprises a change-over switch, the change-over switch is a first three-throw switch K1, an input end of the change-over switch is used for being connected with the constant voltage source module, and an output end of the change-over switch is used for being connected with the circuit board to be tested.
By adopting the technical scheme, when a load signal is not required to be input, the change-over switch is empty to throw, and when the load signal is required to be input, the change-over switch can selectively conduct the output end of the first output unit with the circuit board to be tested, and also can selectively conduct the output end of the second output unit with the circuit board to be tested, so that the switching between the first signal and the second signal is realized.
Optionally, the second display module includes a voltage display screen, and the voltage display screen is connected to the output end of the third operational amplifier OA 3.
By adopting the technical scheme, the voltage display screen can receive the detection signal.
Optionally, the circuit board fixture includes a plurality of conductive pins, and a plurality of the conductive pins are used for penetrating into the circuit board to be tested and electrically connected with the circuit board to be tested.
Through adopting above-mentioned technical scheme, be connected with the circuit board electricity that awaits measuring through electrically conductive thimble, can set up the circuit board that awaits measuring on check out test set, frequently change the wire when having avoided detecting the circuit board that awaits measuring, realized the circuit board that awaits measuring again and check out test set's electric connection.
In summary, the present utility model includes at least one of the following beneficial technical effects:
1. the circuit board to be tested is arranged on the circuit board jig, and the circuit board jig is electrically connected with the circuit board to be tested, so that the circuit board to be tested is electrically connected with the detection equipment. The low-level load signal output by the constant voltage source module is input to the circuit board to be detected, so that the detection safety is improved.
2. Through setting up change over switch, when not needing to input the load signal, change over switch is thrown in the sky, when needs input the load signal, change over switch can select to switch on the output of first output unit and the circuit board that awaits measuring, also can select to switch on the output of second output unit and the circuit board that awaits measuring to realize the switching of first signal and second signal.
3. Through setting up calibration module, during the detection, select first signal and second signal one of them to input to the circuit board that awaits measuring earlier, carry out voltage calibration to equipment and circuit board that awaits measuring, when the low level load signal that first display module shows and the detection signal that second display module shows are inconsistent, adjust first adjustable varistor RP1 for the detection signal that second display module shows is unanimous with the low level load signal that first display module shows.
Drawings
Fig. 1 is a schematic structural view of a circuit board inspection apparatus.
Fig. 2 is a circuit diagram of a constant voltage source module.
Fig. 3 is a circuit diagram of a calibration module.
Fig. 4 is a circuit diagram of a switch module.
Reference numerals illustrate:
1. an apparatus main body; 2. a circuit board jig; 3. a conductive thimble; 4. a constant voltage source module; 41. a first output unit; 411. a first voltage dividing circuit; 412. a first voltage stabilizing circuit; 42. a second output unit; 421. a second voltage dividing circuit; 422. a second voltage stabilizing circuit; 5. a switch module; 51. a change-over switch; 52. a power switch; 6. a first display module; 61. a first display screen; 62. a second display screen; 7. a second display module; 71. a voltage display screen; 8. a calibration module; 81. a voltage regulating circuit; 82. calibrating the voltage stabilizing circuit.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The embodiment of the utility model discloses detection equipment for a circuit board. Referring to fig. 1 and 2, a circuit board detection device includes a device main body 1 and a circuit board fixture 2 mounted on the device main body 1 and electrically connected with the device main body 1, wherein the circuit board fixture 2 is electrically connected with a circuit board to be detected, the device main body 1 includes a constant voltage source module 4, a first display module 6 and a second display module 7, the constant voltage source module 4 is used for obtaining a high level load signal, converting the high level load signal into a low level load signal, the low level load signal is used for being transmitted to the circuit board to be detected, the first display module 6 is used for displaying the low level load signal, and the second display module 7 is used for being electrically connected with the circuit board to be detected, and displaying a detection signal.
The circuit board fixture 2 comprises a plurality of conductive ejector pins 3, and the plurality of conductive ejector pins 3 are used for penetrating into the circuit board to be tested and are electrically connected with the circuit board to be tested. Specifically, the conductive thimble 3 is made of conductive metal. The circuit board to be tested can be arranged on the detection equipment through the electric connection between the conductive thimble 3 and the circuit board to be tested, so that the frequent replacement of wires during the detection of the circuit board to be tested is avoided, and the electric connection between the circuit board to be tested and the detection equipment is realized.
Referring to fig. 2, a low-level load signal output by the constant voltage source module 4 is input to a circuit board to be tested, PI adjustment is performed on the circuit board to be tested, and after the pulse width of the driving wave is narrowed, the second display module 7 receives and displays the detection signal. When the detection signal is consistent with the low-level load signal displayed by the first display module 6, the circuit board is qualified, and when the detection signal is inconsistent with the low-level load signal, the circuit board is unqualified. Specifically, the low-level load signal includes a first signal and a second signal, the constant voltage source module 4 outputs the first signal and the second signal, when detecting, one of the signals is firstly selected to be input into the circuit board to be detected, voltage calibration is performed on the equipment and the circuit board to be detected, so that the low-level load signal displayed by the first display module 6 is consistent with the detection signal displayed by the second display module 7, and then the other signal is selected to be input into the circuit board to be detected, and whether the low-level load signal displayed by the first display module 6 and the detection signal displayed by the second display module 7 are consistent at the moment is observed, so that the detection and verification effects are achieved, and the accuracy of the detection result is improved.
In various embodiments, the constant voltage source module 4 may be composed of different circuit units, and as an example, the constant voltage source module 4 includes a first output unit 41 and a second output unit 42, where an input end of the first output unit 41 is used for obtaining a high-level load signal, an output end of the first output unit 41 is used for outputting a first signal, an input end of the second output unit 42 is connected to an output end of the first output unit 41, and an output end of the second output unit 42 is used for obtaining the first signal.
The present utility model particularly, but not exclusively, proposes a circuit scheme of a first output unit 41, where the first output unit 41 includes a first voltage dividing circuit 411 for outputting a first divided signal and a first voltage stabilizing circuit 412 for outputting the first signal. The first voltage dividing circuit 411 includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the input end of the first voltage dividing resistor R1 is used for obtaining a high-level load signal, and a first voltage dividing signal output point is formed between the first voltage dividing resistor R1 and the second voltage dividing resistor R2. The first voltage stabilizing circuit 412 includes a first operational amplifier OA1, wherein an in-phase input terminal of the first operational amplifier OA1 is used for obtaining a first divided signal from a first divided signal output point, an output terminal of the first operational amplifier OA1 is used for outputting a first signal, and an inverting input terminal of the first operational amplifier OA1 is used for obtaining the first signal.
The present utility model specifically, but not limited to, proposes a circuit scheme of the second output unit 42, where the second output unit 42 includes a second voltage dividing circuit 421 for outputting a second voltage dividing signal and a second voltage stabilizing circuit 422 for outputting the second signal. The second voltage dividing circuit 421 includes a third voltage dividing resistor R4 and a fourth voltage dividing resistor R5, an input end of the third voltage dividing resistor R4 is used for obtaining the first signal, and a second voltage dividing signal output point is formed between the third voltage dividing resistor R4 and the fourth voltage dividing resistor R5. The second voltage stabilizing circuit 422 includes a second operational amplifier OA2, an in-phase input terminal of the second operational amplifier OA2 is used for obtaining a second voltage division signal from a second voltage division signal output point, an output terminal of the second operational amplifier OA2 is used for outputting a second signal, and an inverting input terminal of the second operational amplifier OA2 is used for obtaining the second signal.
Specifically, a first balancing resistor R3 may be further connected between the non-inverting input end of the first operational amplifier OA1 and the first divided signal output point, a second balancing resistor R6 may be further connected between the non-inverting input end of the second operational amplifier OA2 and the output end of the first operational amplifier OA1, and the first balancing resistor R3 and the second balancing resistor R6 are both used to make the offset current of the operational amplifier not generate additional offset voltage.
Referring to fig. 3, the constant voltage source module 4 outputs two low-level load signals, namely, a first signal and a second signal, and when the circuit board is detected, one signal can be selected to be transmitted to the circuit board for calibration. Further, the device main body 1 further includes a calibration module 8, and specifically, but not limited to, a circuit scheme of the calibration module 8 is provided, where the calibration module 8 includes a voltage regulating circuit 81 and a calibration voltage stabilizing circuit 82. The input end of the voltage regulating circuit 81 is used for being connected with a circuit board to be tested, the output end is used for outputting a voltage regulating signal, the voltage regulating circuit 81 comprises a first adjustable rheostat RP1 and a fifth voltage dividing resistor R8, and a voltage regulating signal output point is formed between the first adjustable rheostat RP1 and the fifth voltage dividing resistor R8. The calibration voltage stabilizing circuit 82 includes a third operational amplifier OA3, an in-phase input end of the third operational amplifier OA3 is used for obtaining the voltage regulating signal from the voltage regulating signal output point, an output end of the third operational amplifier OA3 is used for outputting the detection signal, and an inverting input end of the third operational amplifier OA3 is used for obtaining the detection signal. During detection, one of the first signal and the second signal is input into the circuit board to be detected, voltage calibration is carried out on the equipment and the circuit board to be detected, and when the low-level load signal displayed by the first display module 6 is inconsistent with the detection signal displayed by the second display module 7, the first adjustable rheostat RP1 is adjusted so that the detection signal displayed by the second display module 7 is consistent with the low-level load signal displayed by the first display module 6.
Referring to fig. 1 and 4, the apparatus body 1 further includes a switch module 5, and the switch module 5 includes a change-over switch 51, where the change-over switch 51 is a first three-throw switch K1, and is used for selecting a first signal and a second signal. The input end of the change-over switch 51 is used for being connected with the constant voltage source module 4, and the output end of the change-over switch 51 is used for being connected with a circuit board to be tested. When the load signal is not required to be input, the switch module 5 is thrown, and when the load signal is required to be input, the switch module 5 can select the output end of the first output unit 41 to be conducted with the circuit board to be tested, or can select the output end of the second output unit 42 to be conducted with the circuit board to be tested, so as to realize the switching of the first signal and the second signal. Further, the switch module 5 further includes a power switch 52 for supplying power to the apparatus body 1.
The first display module 6 includes a first display screen 61 for receiving a low-level load signal and displaying the load signal in the form of a voltage value, and may further include a second display screen 62 for displaying a current value input to the circuit board to be tested. The second display module 7 is used for being electrically connected with the circuit board to be tested and displaying detection signals. The second display module 7 includes a voltage display 71, and the voltage display 71 is connected to the output terminal of the third operational amplifier OA3 to receive the detection signal and display the voltage value. At the time of detection verification, the value of the first display screen 61 is identical to the value of the voltage display screen 71, and the circuit board is qualified.
The implementation principle of the embodiment of the utility model is as follows: when the circuit board to be detected is detected, the circuit board to be detected is arranged on the circuit board jig 2 so as to realize the electric connection between the circuit board to be detected and the detection equipment. The low-level load signal output by the constant voltage source module 4 is input to the circuit board to be tested, PI adjustment is carried out on the circuit board to be tested, and after the pulse width of the driving wave is narrowed, the second display module 7 receives and displays the detection signal. When the detection signal is consistent with the low-level load signal displayed by the first display module 6, the circuit board is qualified, and when the detection signal is inconsistent with the low-level load signal, the circuit board is unqualified. Through circuit board tool 2 and circuit board electricity connection that awaits measuring, improved detection efficiency, constant voltage source module 4 is with the load signal of high level conversion low level's load signal, has improved the security of detection.
The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (8)
1. The utility model provides a detection equipment of circuit board, its characterized in that, including equipment main part (1) with install in on equipment main part (1), and with circuit board tool (2) that equipment main part (1) electricity is connected, circuit board tool (2) are used for being connected with the circuit board that awaits measuring, equipment main part (1) are including constant voltage source module (4), first display module (6) and second display module (7), constant voltage source module (4) are used for acquireing high-level load signal, will high-level load signal changes low-level load signal, low-level load signal is used for carrying to the circuit board that awaits measuring, first display module (6) are used for showing low-level load signal, second display module (7) are used for being connected with the circuit board electricity that awaits measuring, show the detected signal.
2. The circuit board detection device according to claim 1, wherein the low-level load signal comprises a first signal and a second signal, the constant voltage source module (4) comprises a first output unit (41) and a second output unit (42), an input end of the first output unit (41) is used for acquiring the high-level load signal, an output end of the first output unit (41) is used for outputting the first signal, an input end of the second output unit (42) is connected to an output end of the first output unit (41) and used for acquiring the first signal, and an output end of the second output unit (42) is used for outputting the second signal.
3. The board inspection apparatus according to claim 2, wherein the first output unit (41) includes:
the first voltage dividing circuit (411) is used for outputting a first voltage dividing signal and comprises a first voltage dividing resistor R1 and a second voltage dividing resistor R2, wherein the input end of the first voltage dividing resistor R1 is used for acquiring a high-level load signal, and a first voltage dividing signal output point is formed between the first voltage dividing resistor R1 and the second voltage dividing resistor R2;
the first voltage stabilizing circuit (412) comprises a first operational amplifier OA1, wherein a non-inverting input end of the first operational amplifier OA1 is used for obtaining the first divided signal from the first divided signal output point, an output end of the first operational amplifier OA1 is used for outputting a first signal, and an inverting input end of the first operational amplifier OA1 is used for obtaining the first signal.
4. A board inspection apparatus according to claim 3, wherein the second output unit (42) includes:
the second voltage dividing circuit (421) is configured to output a second voltage dividing signal, and comprises a third voltage dividing resistor R4 and a fourth voltage dividing resistor R5, wherein an input end of the third voltage dividing resistor R4 is used for acquiring a first signal, and a second voltage dividing signal output point is formed between the third voltage dividing resistor R4 and the fourth voltage dividing resistor R5;
the second voltage stabilizing circuit (422) comprises a second operational amplifier OA2, wherein the non-inverting input end of the second operational amplifier OA2 is used for acquiring the second voltage division signal from the second voltage division signal output point, the output end of the second operational amplifier OA2 is used for outputting a second signal, and the inverting input end of the second operational amplifier OA2 is used for acquiring the second signal.
5. The circuit board detection device according to claim 1, further comprising a calibration module (8), wherein the calibration module (8) comprises:
the voltage regulating circuit (81) is used for being connected with the circuit board to be tested, the output end is used for outputting a voltage regulating signal, the voltage regulating circuit (81) comprises a first adjustable rheostat RP1 and a fifth voltage dividing resistor R8, and a voltage regulating signal output point is formed between the first adjustable rheostat RP1 and the fifth voltage dividing resistor R8;
the calibration voltage stabilizing circuit (82) is used for outputting detection signals and comprises a third operational amplifier OA3, wherein the non-inverting input end of the third operational amplifier OA3 is used for acquiring the voltage regulating signals from the voltage regulating signal output point, the output end of the third operational amplifier OA3 is used for outputting detection signals, and the inverting input end of the third operational amplifier OA3 is used for acquiring the detection signals.
6. The circuit board detection device according to claim 2, wherein the device main body (1) further comprises a switch module (5), the switch module (5) comprises a change-over switch (51), the change-over switch (51) is a first three-throw switch K1, an input end of the change-over switch (51) is used for being connected with the constant voltage source module (4), and an output end of the change-over switch (51) is used for being connected with a circuit board to be detected.
7. The circuit board detection device according to claim 5, wherein the second display module (7) comprises a voltage display (71), and the voltage display (71) is connected to the output terminal of the third operational amplifier OA 3.
8. The circuit board detection device according to claim 1, wherein the circuit board fixture (2) comprises a plurality of conductive pins (3), and the plurality of conductive pins (3) are used for penetrating into the circuit board to be detected and electrically connected with the circuit board to be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321037756.4U CN219695361U (en) | 2023-05-04 | 2023-05-04 | Circuit board detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321037756.4U CN219695361U (en) | 2023-05-04 | 2023-05-04 | Circuit board detection equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219695361U true CN219695361U (en) | 2023-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321037756.4U Active CN219695361U (en) | 2023-05-04 | 2023-05-04 | Circuit board detection equipment |
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| Country | Link |
|---|---|
| CN (1) | CN219695361U (en) |
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2023
- 2023-05-04 CN CN202321037756.4U patent/CN219695361U/en active Active
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