Automatic test fixture and system

Abstract

The utility model relates to the technical field of test equipment, and discloses an automatic test clamp and system, and the clamp comprises a test box body, a test load interface, a test power interface, a control interface and a test instrument interface which are disposed on the back surface of the test box body, and two groups of test interfaces which are disposed on the upper surface of an upper cover of the test box body. The plurality of load switching relays, the plurality of power supply switching relays and the feedback relay are arranged in the test box body. And two input ends of each load switching relay are electrically connected with two corresponding test interfaces in the two groups of test interfaces respectively, and an output end of each load switching relay is connected with a corresponding test load interface. Two output ends of each power supply switching relay are respectively connected with two corresponding test interfaces in the two groups of test interfaces, the output end is connected with the corresponding test power supply interface, the relay coil is controlled by the control interface, the fixture can automatically and alternately switch the two groups of test interfaces to work, and missing detection caused by continuous detection of the same group of products is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, in particular to an automatic testing fixture and system. Background Art

[0002] Power product testing, whether it is a single product or multiple products tested at the same time, especially for production lines, in order to improve test efficiency and share test equipment to save costs, the general test fixture design has products loaded on both sides AB and switched in turn. While the A side is tested, the products to be tested on the B side are loaded in advance and the barcodes are scanned, and vice versa. However, the AB switching design of most test fixtures is manually implemented by toggling switches, which creates the opportunity for missed tests. That is, the operator may fail to toggle the switch correctly in time, and test the product on the A side twice in a row, resulting in missed tests on the product on the B side; or test the product on the B side twice in a row, while the product on the A side is not tested, resulting in missed tests. For this reason, it is necessary to design a new automatic test fixture that can avoid the situation where the same side is tested twice in a row and missed tests occur. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide an automatic test fixture, which can automatically switch to testing the products on the B side under the control of the test control device after the test on the A side is completed, so as to avoid the missed inspection of products due to the continuous testing of the products on one side caused by manual switching.

[0004] To solve the above problems, the technical solution adopted by the utility model is as follows: an automatic test fixture, comprising: a test box; two groups of test interfaces, which are arranged on the upper surface of the upper cover of the test box and are used to be electrically connected to the product to be tested; a plurality of load switching relays, which are arranged in the test box, and the two input ends of each load switching relay are electrically connected to the two test interfaces corresponding to the two groups of test interfaces respectively; a multi-channel test load interface, which is arranged on the back side of the test box, and the multiple test load interfaces are electrically connected to the output ends of the multiple load switching relays in a one-to-one correspondence; a plurality of power supply switching relays, which are arranged in the test box, and the two output ends of each power supply switching relay are electrically connected to the two test interfaces corresponding to the two groups of test interfaces respectively; a multi-channel test power supply interface, which is arranged on the back side of the test box side, the multiple test power supply interfaces are electrically connected to the input ends of the multiple power supply switching relays one by one; the control interface is arranged on the back side of the test box body, and is used to be electrically connected to the test control equipment, wherein the control pins are electrically connected to the coils of the multiple load switching relays and the multiple power supply switching relays; the test instrument interface is arranged on the back side of the test box body, and is used to be electrically connected to the test instruments other than the test power supply and the test electronic load, and is electrically connected to the two groups of the test interfaces; the feedback relay is arranged in the test box body, the input end is electrically connected to the power supply pin of the control interface, the two output ends are respectively electrically connected to the two feedback pins of the control interface, the coil is electrically connected to the control pin, and is used to feed back the working status of the load switching relay and the power supply switching relay to the test control equipment.

[0005] Compared with the prior art, the beneficial effect of the utility model is that the test control device can be connected to the coils of multiple load switching relays and multiple power supply switching relays through the control interface, so as to switch one of the two groups of test interfaces to be connected to the test load and the test power supply by controlling the actions of the load switching relay and the power supply switching relay, and control the test instrument to perform alternating tests on the products connected to the two groups of test interfaces. The switching process can be automatically controlled by the test control device without manually toggling the switch, thereby avoiding the situation where a group of products on one side is continuously tested twice and the products on the other side are missed because the operator forgets to toggle the switch to switch the test circuit. At the same time, since only the connection routes between the two groups of test interfaces and the test power supply and the test load are switched, the number of relays is reduced and the fixture cost is reduced.

[0006] In the above-mentioned automatic test fixture, at least two pins in the control interface serve as the control pins, and a plurality of the control pins are connected in parallel to be electrically connected to the coils of a plurality of the load switching relays, a plurality of the power supply switching relays and the feedback relay.

[0007] The above-mentioned automatic test fixture further includes two test indicator lights, and the two test indicator lights are electrically connected to the two indication pins of the control interface respectively.

[0008] The above-mentioned automatic test fixture further includes a plurality of sponge pads, which are arranged on the upper surface of the upper cover of the test box, and each of the sponge pads is arranged on one side of the corresponding test interface.

[0009] An automatic testing system comprises the above-mentioned automatic testing fixture, a test control device, a plurality of testing instruments and a barcode scanning gun, wherein the test control device is electrically connected to the control interface of the automatic testing fixture, the testing instruments except the test power supply and the test electronic load are electrically connected to the test instrument interface of the automatic testing fixture, the test electronic load is electrically connected to the test load interface of the automatic testing fixture in a one-to-one correspondence, the test power supply is electrically connected to the test power interface of the automatic testing fixture in a one-to-one correspondence, and the test instruments and the barcode scanning gun are electrically connected to the test control device.

[0010] The above-mentioned automatic test fixture, the test control device includes a computer, a DIO board and a display, the display and the DIO board are electrically connected to the computer, the barcode scanner and the test instrument are connected to the computer, and the DIO board is electrically connected to the control interface.

[0011] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A top view of an automatic test fixture according to an embodiment of the present utility model;

[0013] Figure 2 A rear view of the automatic test fixture according to an embodiment of the present utility model;

[0014] Figure 3 A side view of an automatic test fixture according to an embodiment of the utility model;

[0015] Figure 4 A circuit schematic diagram of an automatic test fixture according to an embodiment of the utility model;

[0016] Figure 5 The following is a principle block diagram of an automatic testing system according to an embodiment of the present utility model.

[0017] Description of Figure Numbers:

[0018] 100 test box, 110 test interface, 120 test indicator light, 130 sponge pad, 140 handle, 150 lock, 200 AC test power interface, 210 DC test power interface, 300 control interface, 400 test instrument interface. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below. Figure 1 , Figure 2 and Figure 4The embodiment of the utility model provides an automatic test fixture, including a test box 100, two groups of test interfaces 110, multiple load switching relays, a multi-channel test load interface, multiple power supply switching relays, a multi-channel test power supply interface, a control interface 300, a test instrument interface 400 and a feedback relay. The two groups of test interfaces 110 are arranged on the upper surface of the upper cover of the test box 100 for electrical connection with the product to be tested. The two groups of test interfaces 110 are respectively arranged in the left half area and the right half area of ​​the upper cover, and text or symbol identification is printed nearby for the operator to distinguish. The load switching relay, the power supply switching relay and the feedback relay are all arranged in the test box 100, and the test load interface, the test power supply interface, the control interface 300 and the test instrument interface 400 are all arranged on the back surface of the test box 100. The first input terminal and the second input terminal of each load switching relay are respectively electrically connected to the pins for connecting the load in a corresponding test interface 110 in the test interface group A and the test interface group B, and the output terminal of each load switching relay is electrically connected to the corresponding test load interface, and is connected to the electronic load for testing through the load test interface 110. The first output section and the second output terminal of each power supply switching relay are respectively electrically connected to the pins for connecting the power supply in a corresponding test interface 110 in the test interface group A and the test interface group B, and the input terminal of each power supply switching relay is electrically connected to the test power supply interface, and is connected to the AC power supply or DC power supply for testing through the test power supply interface. The pins for connecting the test instruments in the two groups of test interfaces 110 are electrically connected to the test instrument interface 400, and other test instruments except the test power supply and the test electronic load are connected through the test instrument interface 400. The coils of the load switching relay, the power supply switching relay and the feedback relay are all electrically connected to the control pins in the control interface 300, connected to the test control device through the control interface 300, and operate together under the control of the control signal of the test control device, so that the electronic load and the test power supply for testing are switched back and forth to be electrically connected to the test interface group A or the test interface group B, and the products connected to the test interface group A and the test interface group B are tested alternately. The input end of the feedback relay is electrically connected to the power supply pin in the control interface 300, and the two output ends are electrically connected to the two feedback pins in the control interface 300, so as to feedback to the test control device through the control interface 300 which group of test interfaces is currently electrically connected to the test power supply and the test electronic load.

[0020] The automatic test fixture of the embodiment of the utility model can input a control signal through the control pin in the control interface 300, control the load switching relay and the power supply switching relay to operate, automatically switch the test power supply and the test interface 110 connected to the test electronic load, thereby automatically switching the test product group, and realizing the alternating test of the two groups of products on the two groups of test interfaces 110. The switching process does not require manual toggling of the switch, which avoids the product on the same side being tested twice in a row due to human error, resulting in the product on the other side being missed. At the same time, since only the connection lines between the two groups of test interfaces 110 and the test electronic load and the test power supply are switched, the number of relays used is reduced, and the cost of the automatic test fixture is reduced.

[0021] Reference Figure 1 and Figure 4 In this embodiment, the test interface group A and the test interface group B each include four test interfaces 110, and four products can be tested simultaneously. Accordingly, the number of load switching relays and power switching relays is also four each. Figure 4In this embodiment, the load switching relay includes relays K5 to K6, the power supply switching relay includes relays K1 to K4, and the relay K10 is a feedback relay, each of which includes two sets of single-pole double-throw contacts. The two moving contacts of the two sets of contacts of the load switching relay are respectively connected to the two pins of the test load interface of the corresponding circuit, which are used to connect the positive and negative poles of the test electronic load. The two moving contacts of the two sets of normally open contacts of the load switching relay are used as output ends to connect the positive and negative pole pins of the load connected in the corresponding test interface 110 in the two sets of test interfaces 110, and the two sets of static contacts of the two sets of contacts are used as two input ends to connect the corresponding test interfaces 110 in the two sets of test interfaces 110. Taking relay K5 as an example, the two normally closed static contacts of the two sets of contacts are respectively connected to the pins of the positive and negative poles of the test electronic load in the UUTA1 interface of the A group test interface, and the two normally open static contacts of the two sets of contacts are respectively connected to the pins of the positive and negative poles of the test electronic load in the UUTB1 interface of the B group test interface. The two moving contacts in the two groups of contacts of the power switching relay are connected to the two pins of the test power interface as input terminals, respectively, for connecting the positive and negative poles of the test power supply, and the two groups of static contacts in the two groups of contacts are connected to the corresponding test interfaces 110 in the two groups of test interfaces 110 as two output terminals. Taking relay K1 as an example, the two normally closed static contacts in the two groups of contacts are connected to the pins of the UUTA1 interface in the group A test interface that connects the positive and negative poles of the test power supply, and the two normally open static contacts in the two groups of contacts are connected to the pins of the UUTB1 interface in the group B test interface that connects the positive and negative poles of the test power supply. The feedback relay K10 uses only one set of contacts. The moving contact is connected to pin 19 in the control interface 300 to receive 12V DC power supply, the normally closed static contact is connected to pin 24 of the control interface 300, and the normally open static contact is connected to pin 26 of the control interface 300. In order to avoid the failure of switching due to insufficient driving voltage of a single pin, which leads to the inability to stably drive the relay to close, refer to Figure 4 In this embodiment, pins 32 and 33 in the control interface 300 are both used as control pins. The two control pins are connected in parallel and electrically connected to the coils of the load switching relay, the power supply switching relay and the feedback relay, so as to provide sufficient voltage to the coils of the relays to ensure the stability of the switching action.

[0022] When the test control device outputs a low level through the control pin, each relay remains in place, and the four test power supplies and four test electronic loads are electrically connected to the four test interfaces UUTA1 to UUTA4 of group A through the contacts of the relay, so that the four products placed on the test interface of group A work under load, and the test instrument collects the parameters of the four products on the test interface of group A through the test interface 110, and at the same time, the 24-pin of the control interface 300 feeds back a high level, telling the test control device that the product on the test interface of group A is currently being tested; when the test control device outputs a high level through the control pin, each relay is closed, and the four test power supplies and four test electronic loads are electrically connected to the four test interfaces UUTB1 to UUTB4 of group B through the contacts of the relay, so that the four products placed on the test interface of group B work under load, and the test instrument collects the parameters of the four products on the test interface of group B through the test interface 110, and at the same time, the 26-pin of the control interface 300 feeds back a high level, telling the test control device that the product on the test interface of group B is currently being tested.

[0023] Reference Figure 2 In the present embodiment, the test power interface includes an AC test power interface 200 and a DC test power interface 210, which are used for connecting to an AC test power supply and a DC test power supply, respectively. The input end of the power supply switching relay can be further connected to the AC test power interface 200 and the DC test power interface 210 through a single-pole double-throw switch or a relay. According to the needs of the product under test, the AC test power supply or the DC test power supply can be used to power the product by controlling the action of the single-pole double-throw switch or the relay. If the product under test requires both AC and DC power supply, two groups of power supply switching relays are set, and the input ends of the two groups of power supply switching relays are electrically connected to the AC test power interface 200 and the DC test power interface 210, respectively. Refer to Figure 2 In this embodiment, the four-way test load interface and the test instrument interface 400 share two 36-pin and 50-pin aviation interfaces. The test instrument interface 400 should include a four-way interface, and the pins of the four-way test instrument interface 400 are electrically connected to the test pins of the corresponding test interface 110 in the test interface group A and the test interface group B, that is, the test pins of the UUTA1 interface and the UUTB1 interface are connected in parallel with the first test instrument interface 400, and the test pins of the UUTA2 interface and the UUTB2 interface are connected in parallel with the second test instrument interface 400, and so on.

[0024] Reference Figure 1In this embodiment, in order to prevent the components on the product from being damaged by contact and scratching the upper cover of the test box 100 when the product is connected to the test interface 110, a sponge pad 130 is provided on the side of each test interface 110. When the product is connected to the test interface 110, the circuit part of the product will be placed on the sponge pad 130 to prevent the soldering feet of the components on the product from being damaged during the test process. Figure 1 and Figure 4 In this embodiment, two test indicator lights 120 are also provided on the upper cover of the test box 100. The two indicator lights are respectively connected to the 37th pin and the 30th pin of the control interface 300, and are respectively provided on the side of the test interface group A and the test interface group B. When the test control device outputs a low level to the control pin of the control interface 300, a high level is output to the 37th pin, so that the indicator light on the side of the test interface group A lights up, telling the operator that the product on the test interface group A is currently being tested and a new product can be placed on the test interface group B; when the test control device outputs a high level to the control pin of the control interface 300, a high level is output to the 30th pin, so that the indicator light on the side of the test interface group B lights up, telling the operator that the product on the test interface group B is currently being tested and a new product can be placed on the test interface group A.

[0025] Reference Figure 3 In this embodiment, for easy maintenance, the upper cover of the test box 100 is hinged to its main body and locked by a lock 150. When the internal relay needs to be replaced, the lock 150 can be unlocked and the upper cover of the test box 100 can be opened to replace the relay that needs to be replaced. Handles 140 are provided on the left and right sides of the upper surface of the upper cover of the test box 100 to facilitate carrying the automatic test fixture.

[0026] Reference Figure 5The automatic test system of an embodiment of the present invention includes the above-mentioned automatic test fixture, test control equipment, multiple test instruments and a barcode scanner. The test instrument is determined according to the parameters of the project to be tested, and generally must include a test power supply and a test electronic load to provide a test working environment for the product. In addition, instruments such as voltmeters, ammeters or oscilloscopes are selected according to the test items to read the test parameters of the product. The test control equipment is electrically connected to the control interface 300 of the automatic test fixture, and the test instruments other than the test power supply and the test electronic load are electrically connected to the test instrument interface 400 of the automatic test fixture. The test electronic load and the test load interface of the automatic test fixture are electrically connected one-to-one, and the test power supply is electrically connected one-to-one with the test power supply interface of the automatic test fixture. The test instrument and the barcode scanner are electrically connected to the test control equipment. In this embodiment, the test control equipment includes an industrial computer, a DIO board and a display. The computer is connected to the MES system of the factory through a network port. The barcode scanner, the display and the test instrument are connected to the computer through a USB interface, an HDMI interface or a serial port, etc. The DIO board is inserted into the expansion card slot of the computer, and the output interface of the DIO board is connected to the control interface 300 of the automatic test fixture. The barcode scanner is used to scan the QR code or barcode on the product or product document, and input the product number information. The display is used to display the test results and test status and other information. The computer is used to control the relay action through the DIO board, control the side switching test, and upload the data of the test instrument and the product number information to the MES system. When working, first place the product on the test interface 110 that is not being tested, and then scan the QR code of the product through the barcode scanner to enter the product information. After the computer receives the product information, it is considered that there is a product placed on the test interface 110. When another group of tests is completed, the relay action will be controlled to switch to test the newly placed product, and after the test is completed, the test results and the product number will be uploaded to the MES system. When the products on one group of test interfaces 110 are being tested, the operator can replace the products on another group of test interfaces 110 and enter the product information of the newly placed products through a barcode scanner after the replacement is completed.

[0027] It is understandable that multiple test load interfaces can be electrically connected to multiple different test electronic loads in a one-to-one correspondence, or to multiple test channels of the same test load interface in a one-to-one correspondence. Multiple test power supply interfaces can be electrically connected to the same test power supply with sufficient power, or to multiple different test power supplies in a one-to-one correspondence.

[0028] It is understandable that in order to ensure that the voltage output by the DIO board is sufficient to drive the coils of multiple relays, the output interface of the DIO board should adopt a passive interface. By connecting the power pin on the output interface side of the DIO board to an external power adapter, it can be ensured that the DIO board can output sufficient voltage to drive the relays.

[0029] It should be noted that in the description of the present invention, if there are any orientation descriptions, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are all based on the orientations or positional relationships shown in the drawings. They 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 orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An automatic test fixture, characterized in that: include: Test box (100); Two groups of test interfaces (110), arranged on the upper surface of the upper cover of the test box (100), for electrically connecting to the product to be tested; A plurality of load switching relays are arranged in the test box (100), and two input ends of each of the load switching relays are electrically connected to two corresponding test interfaces (110) in the two groups of test interfaces (110); A multi-channel test load interface is arranged on the back side of the test box (100), and the multi-channel test load interface is electrically connected to the output ends of the plurality of load switching relays in a one-to-one correspondence; A plurality of power supply switching relays are arranged in the test box (100), and two output ends of each of the power supply switching relays are electrically connected to two corresponding test interfaces (110) in the two groups of test interfaces (110); A multi-channel test power supply interface is arranged on the back side of the test box (100), and the multi-channel test power supply interface is electrically connected to the input ends of the plurality of power supply switching relays in a one-to-one correspondence; A control interface (300) is arranged on the back side of the test box (100) and is used to be electrically connected to a test control device, wherein the control pins are electrically connected to the coils of the plurality of load switching relays and the plurality of power supply switching relays; A test instrument interface (400), arranged on the back side of the test box (100), used to be electrically connected to a test instrument other than a test power supply and a test electronic load, and electrically connected to the two sets of test interfaces (110); A feedback relay is arranged in the test box (100), the input end is electrically connected to the power supply pin of the control interface (300), the two output ends are electrically connected to the two feedback pins of the control interface (300), and the coil is electrically connected to the control pins, and is used to feed back the working status of the load switching relay and the power switching relay to the test control device.

2. The automatic test fixture according to claim 1, characterized in that: At least two pins in the control interface (300) serve as the control pins, and a plurality of the control pins are connected in parallel to be electrically connected to the coils of a plurality of the load switching relays, a plurality of the power supply switching relays and the feedback relay.

3. The automatic test fixture according to claim 1, characterized in that: It also includes two test indicator lights (120), and the two test indicator lights (120) are electrically connected to the two indication pins of the control interface (300) respectively.

4. The automatic test fixture according to claim 1, characterized in that: It also comprises a plurality of sponge pads (130) which are arranged on the upper surface of the upper cover of the test box (100), and each of the sponge pads (130) is arranged on one side of the corresponding test interface (110).

5. An automatic testing system, characterized in that: It comprises an automatic test fixture according to any one of claims 1 to 4, a test control device, a plurality of test instruments and a barcode scanner, the test control device is electrically connected to a control interface (300) of the automatic test fixture, the test instruments other than a test power supply and a test electronic load are electrically connected to a test instrument interface (400) of the automatic test fixture, the test electronic load and a test load interface of the automatic test fixture are electrically connected one-to-one, the test power supply and a test power interface of the automatic test fixture are electrically connected one-to-one, and the test instruments and the barcode scanner are electrically connected to the test control device.

6. The automatic testing system according to claim 5, characterized in that: The test control device comprises a computer, a DIO board and a display, wherein the display and the DIO board are both electrically connected to the computer, the barcode scanner and the test instrument are connected to the computer, and the DIO board is electrically connected to the control interface (300).

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