Automatic testing equipment for curved surface surface-mounted resistor and testing method of automatic testing equipment

Abstract

The invention discloses automatic testing equipment for a curved surface surface-mounted resistor and a testing method thereof. The automatic testing equipment for the curved surface surface-mounted resistor comprises a bearing moving assembly, a signal generator, a resistance value detection circuit and a controller, the controller is connected with the bearing moving assembly, the signal generator and the resistance value detection circuit. According to the invention, the controller controls the bearing moving assembly to move the to-be-detected curved surface surface-mounted resistor in the to-be-detected area to the resistance value detection area; a signal generator is adopted to output a voltage excitation signal to the to-be-detected curved surface surface-mounted resistor; a resistance value detection circuit is used for testing the resistance value of the to-be-tested curved surface surface-mounted resistor and outputting a corresponding resistance value detection signal; and the controller receives the resistance value detection signal output by the resistance value detection circuit and obtains the resistance value of the corresponding curved surface surface-mounted resistor according to the resistance value detection signal, so that automatic testing of the curved surface surface-mounted resistor is realized, and the testing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of curved surface mount resistor testing, and in particular to a curved surface mount resistor automatic testing device and a testing method thereof. Background Art

[0002] Curved surface mount resistors are a type of surface mount resistors used in situations where the position and shape of the resistors need to be precisely controlled. There is an electrical connection between the resistors of the curved surface mount resistors, thus forming a resistor network; however, when testing the resistance value of one of the resistors, due to the influence of the surrounding resistors, the current flowing through this resistor cannot be directly or indirectly measured, resulting in the inability to detect the curved surface mount resistors. Summary of the invention

[0003] The purpose of the present invention is to design an automatic testing device for curved surface mount resistors in order to solve the above problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions: Surface mount resistor automatic test equipment includes: A load-bearing mobile component, wherein the load-bearing mobile component is used for placing the curved surface surface mount resistor to be tested; A signal generator, the signal generator is used to generate an excitation signal; A resistance detection circuit, the resistance detection circuit is used to detect the resistance of the curved surface mount resistor to be tested and output a corresponding resistance detection signal; A controller, wherein the control end of the controller is connected to the carrying and moving component and the signal generator, and the controller is also connected to the resistance detection circuit. The controller is used to control the carrying and moving group to move the curved surface mount resistor to be tested in the test area to the resistance detection area, control the signal generator to output the excitation signal, and obtain the resistance value of the corresponding curved surface mount resistor according to the received resistance detection signal.

[0005] The present invention also provides an automatic testing method for curved surface mount resistors, which is applied to the above-mentioned automatic testing device for curved surface mount resistors. The automatic testing method for curved surface mount resistors comprises the following steps: Move the surface mount resistor to be tested in the test area to the resistance detection area; Detecting the resistance of the curved surface mount resistor to be tested in the resistance detection area; Move the curved surface mount resistor to be tested in the resistance value detection area to the appearance detection area; Detecting the appearance of the curved surface mount resistor to be tested; Move the inspected curved surface mount resistor from the appearance inspection area to the inspected area.

[0006] The beneficial effects of the present invention are: The curved surface mount resistor automated testing equipment controls the carrying moving component through a controller to move the curved surface mount resistor to be tested in the test area to the resistance detection area; and uses a signal generator to output a voltage excitation signal to the curved surface mount resistor to be tested; also uses a resistance detection circuit to test the resistance of the curved surface mount resistor to be tested, and outputs a corresponding resistance detection signal; the controller receives the resistance detection signal output by the resistance detection circuit, and obtains the resistance of the corresponding curved surface mount resistor according to the resistance detection signal, thereby realizing automated testing of the curved surface mount resistor and improving testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is an overall block diagram of the automatic testing equipment for curved surface mount resistors of the present invention; Figure 2 A circuit diagram of resistance value testing of the automatic testing equipment for curved surface mount resistors of the present invention; Figure 3 It is a structural schematic diagram of the automatic testing equipment for curved surface mount resistors of the present invention; Figure 4 A schematic diagram of the movement of the load-bearing moving component of the curved surface mount resistor automatic testing equipment of the present invention; Figure 5 A schematic diagram of the rotation of the load-bearing moving component of the curved surface mount resistor automatic testing device of the present invention; Figure 6 It is a structural schematic diagram of the load-bearing lifting assembly of the curved surface mount resistor automatic testing equipment of the present invention; Figure 7 A schematic diagram of the lifting and lowering of a resistance value testing component of the automatic testing equipment for curved surface mount resistors of the present invention; Figure 8 A schematic diagram of the lifting and lowering of the appearance detection component of the curved surface mount resistor automatic test equipment of the present invention; Fig. 9 It is a schematic diagram of the left-right movement of the load-bearing lifting assembly of the curved surface mount resistor automatic testing equipment of the present invention; Fig.10 A schematic diagram of a flow chart of an embodiment of an automated testing method for curved surface mount resistors according to the present invention; In the figure: 10-controller, 20-load-bearing lifting assembly, 21-first lifting assembly, 22-second lifting assembly, 23-drag chain, 24-lateral movement assembly, 25-heavy-load connector, 30-load-bearing moving assembly, 31-lateral movement assembly, 32-area moving assembly, 33-rotation assembly, 40-signal generator, 50-resistance detection circuit, 51-test probe, 60-appearance detection assembly, 61-camera, 70-surface surface mount resistor to be tested. DETAILED DESCRIPTION

[0008] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0009] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0010] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0011] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0012] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0013] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0015] like Figure 1-10 As shown, the surface mount resistor automatic test equipment includes: A carrying and moving component 30, wherein the carrying and moving component 30 is used for placing a curved surface mount resistor 70 to be tested; A signal generator 40, wherein the signal generator 40 is used to generate an excitation signal; A resistance detection circuit 50, wherein the resistance detection circuit 50 is used to detect the resistance of the curved surface mount resistor 70 to be tested and output a corresponding resistance detection signal; A controller 10, wherein the control end of the controller 10 is connected to the carrying and moving component 30 and the signal generator 40, and the controller 10 is also connected to the resistance detection circuit 50. The controller 10 is used to control the carrying and moving group to move the curved surface mount resistor 70 to be tested in the test area to the resistance detection area, control the signal generator 40 to output the excitation signal, and obtain the resistance of the corresponding curved surface mount resistor according to the received resistance detection signal.

[0016] Among them, the signal generator 40 is a device that can provide electrical signals of various frequencies, waveforms and output levels. In this embodiment, a DA signal generator 40 is used to output a stable voltage excitation signal to the curved surface mount resistor 70 to be tested, and each test point is clamped with a standard resistor, and then the resistance of the curved surface mount resistor is tested through the resistance detection circuit 50, that is, the node voltage generated in the curved surface mount resistor by the excitation signal, the current flowing through the curved surface mount resistor 70 to be tested and the current flowing through the standard resistor are combined to obtain the resistance of the curved surface mount resistor 70 to be tested. The surface of the curved surface mount resistor is a resistor network composed of chip resistors. When testing the resistance of a single resistor, its test point is located at the node where the resistors are cross-distributed. It can be understood that, referring to Figure 2 , the excitation probe of the DA signal generator 40 is placed at point E, and the four test probes 51 of the resistance detection circuit 50 are respectively placed at test points A, B, C and D to detect the voltage values ​​of the four test points, thereby forming four loops, and the resistance values ​​of the four resistors to be measured can be calculated respectively; since the voltage-dividing resistors contained in the four test probes 51 are consistent, after the resistor voltage is divided, equal potentials are generated at the test points A, B, C, and D, and then the resistance value of the resistor to be measured is calculated based on the resistor voltage division, for example, the resistance value R between point E and point B is calculated. eb , by U b / R i = (U e -U b ) / R eb , we can get the resistance value R between point E and point B eb = (U e / U b -1)*R i , where R eb U is the resistance value to be tested between test points E and B, in ohms. eis the excitation voltage value given by the excitation probe, in volts, U b is the voltage value of point B detected by the test probe 51, in volts, R i is the pull-down resistance value of the test probe 51, that is, the voltage-dividing resistance value of a single loop, in ohms, and the error analysis is performed under the condition that other resistances do not affect the loop; according to the calculation method of the resistance value, since U e with U b is a common reference voltage, that is, the error can be ignored, and the main error source is R i Therefore, a resistor with an error accuracy of 0.01% is used as a sampling resistor in the design to ensure that the test accuracy of a single loop is within 0.01%.

[0017] In this embodiment, the carrying and moving component 30 can be implemented by any carrying and moving component 30 that can place and move the curved surface mount resistor 70 to be tested; the resistance detection circuit 50 can be implemented by any resistance detection circuit 50 that can detect the resistance value of the curved surface mount resistor 70 to be tested; the controller 10 can be implemented by a controller 10 such as a PLC (Programmable Logic Controller). Specifically, the PLC first controls the carrying and moving component 30 to move the curved surface mount resistor 70 to be tested to the resistance detection area, and the signal generator 40 outputs an excitation signal to the curved surface mount resistor 70 to be tested. The resistance detection circuit 50 can detect the resistance of the curved surface mount resistor and output a corresponding resistance detection signal. The PLC obtains the resistance of the corresponding curved surface mount resistor according to the resistance detection signal. The resistance detection circuit 50 can be provided with multiple test probes 51 to test the resistance values ​​of multiple curved surface mount resistors at the same time to improve the test efficiency.

[0018] The automatic testing equipment for curved surface mount resistors of the present invention controls the carrying moving component 30 through the controller 10 to move the curved surface mount resistor 70 to be tested in the test area to the resistance detection area; and uses the signal generator 40 to output a voltage excitation signal to the curved surface mount resistor 70 to be tested; also uses the resistance detection circuit 50 to test the resistance of the curved surface mount resistor 70 to be tested, and outputs a corresponding resistance detection signal; the controller 10 receives the resistance detection signal output by the resistance detection circuit 50, and obtains the resistance of the corresponding curved surface mount resistor according to the resistance detection signal, thereby realizing the automatic testing of the curved surface mount resistor and improving the testing efficiency.

[0019] In one embodiment, the load-bearing moving assembly 30 includes: A carrier, the carrier being used to place the curved surface mount resistor 70 to be tested; A mobile component, on which the bearing component is provided, and a controlled end of the mobile component is connected to the controller 10; The moving component is used to drive the bearing member to move when moving; Or, when rotating, the supporting member is driven to rotate.

[0020] In this embodiment, the carrying and moving component 30 includes a carrying member and a moving component, wherein the moving component includes a lateral moving component 31, an area moving component 32 and a rotating component 34, and the curved surface mount resistor 70 to be tested is placed on the carrying member, and the size of the carrying member can be adjusted according to the size of the curved surface mount resistor 70 to be tested, so as to detect various types of curved surface mount resistors; specifically, when the controller 10 controls the area moving component to move, the curved surface mount resistor 70 to be tested can be moved to a preset position, that is, the curved surface mount resistor 70 to be tested in the test area can be moved to the resistance detection area, or the curved surface mount resistor that has been tested can be moved to the tested area, thereby realizing the movement of the regional position; when the controller 10 controls the rotating component 34 to rotate, the curved surface mount resistor can be rotated to a preset angle, that is, during detection, the controller 10 can control the rotating component 34 to rotate to different angles, so as to perform resistance detection on the resistors at different positions on the curved surface mount resistor, thereby realizing comprehensive detection of the curved surface mount resistor.

[0021] In one embodiment, the curved surface mount resistor automatic testing equipment further comprises: An appearance detection component 60, wherein the output end of the appearance detection component 60 is connected to the controller 10, and the appearance detection component 60 is used to detect the appearance of the curved surface mount resistor 70 to be tested in the appearance detection area and output a corresponding appearance detection signal; The controller 10 is used to obtain the appearance detection result of the corresponding curved surface mount resistor according to the appearance detection signal.

[0022] Furthermore, the appearance detection component 60 includes a camera 61, an output end of the camera 61 is connected to the controller 10, and the camera 61 is used to collect the appearance image of the curved surface mount resistor 70 to be tested and output the corresponding appearance detection signal.

[0023] In this embodiment, the appearance detection component 60 can be implemented by a camera 61, that is, when the curved surface mount resistor 70 to be tested is moved to the appearance detection area, the camera 61 can collect the appearance image of the curved surface mount resistor 70 to be tested and input it to the controller 10. The controller 10 can obtain the appearance detection result of the corresponding curved surface mount resistor based on the received appearance detection signal. Compared with manual appearance detection, this automatic appearance detection method is simpler and more efficient.

[0024] In one embodiment, the curved surface mount resistor automatic testing equipment further comprises: A load-bearing lifting component 20, wherein a controlled end of the load-bearing lifting component 20 is connected to the controller 10, and the load-bearing lifting component 20 is used to carry the resistance detection group and the appearance detection component 60; The controller 10 is further used to control the load-bearing lifting assembly 20 to move upward or downward, and adjust the height of the resistance detection circuit 50 and the appearance detection assembly 60 .

[0025] Furthermore, the load-bearing lifting assembly 20 includes: A first bearing component, the first bearing component is used to place the resistance detection circuit 50; The first lifting component 21 is provided with the first bearing component. The first lifting component 21 is used for driving the first bearing component to rise and fall when the first lifting component 21 is lifted or lowered.

[0026] Furthermore, the curved surface mount resistor automatic testing equipment further comprises: A second bearing assembly, the second bearing assembly is used to place the appearance detection assembly 60; The second lifting component 22 is provided with the second bearing component. The second lifting component 22 is used for driving the second bearing component to rise and fall when the second lifting component 22 is lifted or lowered.

[0027] In this embodiment, the resistance detection circuit 50 is placed on the first supporting component, and the first lifting component 21 can adjust the position of the resistance detection circuit 50 when it is lifted or lowered, so as to perform resistance detection on the curved surface mount resistors 70 to be tested at different heights; the appearance detection component 60 is placed on the second supporting component, and the second supporting component can adjust the position of the appearance detection component 60 when it is lifted or lowered, so as to perform appearance detection on the curved surface mount resistors 70 to be tested at different heights; in addition, this embodiment is also provided with a drag chain 23, a transverse movement component 24, and a heavy-duty connector 25. The first lifting component 21 and the second lifting component 22 move left and right under the action of the transverse movement component 24, and can perform resistance and appearance detection on different positions of the curved surface mount resistor 70 to be tested, thereby realizing all-round detection.

[0028] In one embodiment, the resistance detection circuit 50 includes: N acquisition circuits, wherein the N acquisition circuits are used to acquire the resistance of the curved surface mount resistor 70 to be tested and output a plurality of resistance detection signals; A multiplexer, wherein the multiple input ends of the multiplexer are connected one by one to the output ends of the N acquisition circuits, and the output end of the multiplexer is connected to the controller 10, and the multiplexer is used to synthesize the multiple resistance detection signals and then input them to the controller 10.

[0029] Among them, the acquisition circuit can be implemented by any acquisition circuit that can acquire the resistance value of the surface mount resistor 70 to be tested, such as an AD acquisition module; in this embodiment, a plurality of low-speed channels are combined into a high-speed channel through a multiplexer, that is, the resistance detection signals output by N acquisition circuits are synthesized and processed and then input to the controller 10, and a large number of resistance detection signals are transmitted to the controller 10 through a high-speed channel, thereby improving the utilization rate of the data link to cover the test of all test points, thereby improving the test efficiency.

[0030] The present invention also provides an automatic testing method for curved surface mount resistors, which is applied to the above-mentioned automatic testing device for curved surface mount resistors. The automatic testing method for curved surface mount resistors comprises the following steps: Move the curved surface mount resistor 70 to be tested in the test area to the resistance value detection area; Detecting the resistance of the curved surface mount resistor 70 to be tested in the resistance detection area; Move the curved surface mount resistor 70 to be tested in the resistance value testing area to the appearance testing area; Detecting the appearance of the curved surface mount resistor 70 to be tested; Move the inspected curved surface mount resistor from the appearance inspection area to the inspected area.

[0031] In this embodiment, the curved surface mount resistor automated testing equipment controls the carrying moving component 30 through the controller 10 to move the curved surface mount resistor 70 to be tested in the test area to the resistance detection area; and uses the signal generator 40 to output a voltage excitation signal to the curved surface mount resistor 70 to be tested; also uses the resistance detection circuit 50 to test the resistance of the curved surface mount resistor 70 to be tested, and outputs a corresponding resistance detection signal; the controller 10 receives the resistance detection signal output by the resistance detection circuit 50, and obtains the resistance of the corresponding curved surface mount resistor according to the resistance detection signal; the controller 10 moves the curved surface mount resistor 70 to be tested in the resistance detection area to the appearance detection area, the appearance detection component 60 detects the appearance of the curved surface mount resistor 70 to be tested and outputs a corresponding appearance detection signal, and the controller 10 obtains the appearance of the corresponding curved surface mount resistor according to the received appearance detection signal; the controller 10 obtains the corresponding test result in combination with the resistance and appearance of the curved surface mount resistor, thereby realizing the automated testing of the curved surface mount resistor to improve the testing efficiency.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic test equipment for curved surface mount resistors, characterized in that: The curved surface mount resistor automatic testing equipment comprises: A load-bearing mobile component, wherein the load-bearing mobile component is used for placing the curved surface surface mount resistor to be tested; A signal generator, the signal generator is used to generate an excitation signal; A resistance detection circuit, the resistance detection circuit is used to detect the resistance of the curved surface mount resistor to be tested and output a corresponding resistance detection signal; A controller, wherein the control end of the controller is connected to the carrying and moving component and the signal generator, and the controller is also connected to the resistance detection circuit. The controller is used to control the carrying and moving group to move the curved surface mount resistor to be tested in the test area to the resistance detection area, control the signal generator to output the excitation signal, and obtain the resistance value of the corresponding curved surface mount resistor according to the received resistance detection signal.

2. The curved surface mount resistor automatic test equipment according to claim 1, characterized in that: The load-bearing mobile component comprises: A carrier, the carrier being used for placing the curved surface mount resistor to be tested; A mobile component, on which the bearing component is provided, and a controlled end of the mobile component is connected to the controller; The moving component is used to drive the bearing member to move when moving; Or, when rotating, the supporting member is driven to rotate.

3. The curved surface mount resistor automatic test equipment according to claim 1, characterized in that: The curved surface mount resistor automatic testing equipment also includes: An appearance detection component, the output end of which is connected to the controller, and the appearance detection component is used to detect the appearance of the curved surface mount resistor to be tested in the appearance detection area and output a corresponding appearance detection signal; The controller is used to obtain the appearance detection result of the corresponding curved surface mount resistor according to the appearance detection signal.

4. The curved surface mount resistor automatic test equipment according to claim 3, characterized in that: The appearance detection component includes a camera, the output end of the camera is connected to the controller, and the camera is used to collect the appearance image of the curved surface mount resistor to be tested and output the corresponding appearance detection signal.

5. The curved surface mount resistor automatic test equipment according to claim 3, characterized in that: The curved surface mount resistor automatic testing equipment also includes: A load-bearing lifting component, wherein a controlled end of the load-bearing lifting component is connected to the controller, and the load-bearing lifting component is used to carry the resistance detection group and the appearance detection component; The controller is also used to control the load-bearing lifting assembly to move upward or downward, and adjust the height of the resistance detection assembly and the appearance detection assembly.

6. The curved surface mount resistor automatic test equipment according to claim 5, characterized in that: The load-bearing lifting assembly comprises: A first bearing component, wherein the first bearing component is used to place the resistance detection component; The first lifting component is provided with the first bearing component, and the first lifting component is used for driving the first bearing component to lift and lower when the first lifting component is lifted and lowered.

7. The automatic testing equipment for curved surface mount resistors according to claim 5, characterized in that: The curved surface mount resistor automatic testing equipment also includes: A second bearing assembly, the second bearing assembly being used for placing the appearance detection assembly; The second lifting component is provided with the second bearing component, and the second lifting component is used for driving the second bearing component to lift when lifting.

8. The curved surface mount resistor automatic test equipment according to claim 1, characterized in that: The resistance detection circuit comprises: N acquisition circuits, wherein the N acquisition circuits are used to acquire the resistance value of the curved surface surface mount resistor to be tested and output a plurality of resistance detection signals; A multiplexer, wherein the multiple input ends of the multiplexer are connected one by one with the output ends of the N acquisition circuits, the output end of the multiplexer is connected with the controller, and the multiplexer is used to synthesize the multiple resistance detection signals and then output them to the controller.

9. An automated testing method for curved surface mount resistors, applied to the automated testing device for curved surface mount resistors as claimed in any one of claims 1 to 8, characterized in that: The automatic testing method for curved surface mount resistors comprises the following steps: Move the surface mount resistor to be tested in the test area to the resistance detection area; Detecting the resistance of the curved surface mount resistor to be tested in the resistance detection area; Move the curved surface mount resistor to be tested in the resistance value detection area to the appearance detection area; Detecting the appearance of the curved surface mount resistor to be tested; Move the inspected curved surface mount resistor from the appearance inspection area to the inspected area.

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