A flatness detection jig

Abstract

The application provides a flatness detection jig, comprising a working box, a supporting and positioning assembly and a testing assembly, the working box comprising a working area and a non-working area, the non-working area being located around the working area; the supporting and positioning assembly being arranged on the working box; a surface on a side of the supporting and positioning assembly away from the working box being a placing surface, the placing surface being used for placing a to-be-tested surface of a to-be-tested product; the testing assembly being arranged on the working box, the testing assembly comprising an electrically connected testing surface and a control element; in the height direction of the working box, the testing surface being located at a preset position below the placing surface, both the testing surface and the placing surface being located above the working area; the control element automatically judging whether the flatness of the to-be-tested surface is qualified according to different position signals of the to-be-tested surface above the testing surface obtained by the testing surface. The flatness detection jig realizes automatic detection of the flatness of the to-be-tested surface, improves the detection efficiency of the flatness, reduces the probability of misjudgment of the detector and has high universality.

Description

Technical Field

[0001] This application relates to the field of testing equipment technology, and in particular to a flatness testing fixture. Background Technology

[0002] Currently, after various stamping and forming processes, hardware products may fail to meet size requirements due to unreasonable mold size design, material stress release, and plastic deformation. This can easily lead to problems such as dimensional deviations and uneven surfaces, resulting in products that cannot meet usage needs.

[0003] In related technologies, to improve the precision of hardware products, the flatness of each surface is usually inspected after the hardware products are stamped and formed. Traditionally, the hardware products are placed on an inspection platform, and feeler gauges or feeler gauges are used to check the dimensions of each surface to be inspected. This inspection method is not only inefficient, but also requires a high level of skill from the operator, is subject to subjective judgment by the inspector, and is prone to misjudgment, resulting in poor inspection versatility. Utility Model Content

[0004] This application provides a flatness testing fixture to solve the problems of low efficiency and poor versatility in manual flatness testing of the surface of a product under test in related technologies.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: This application provides a flatness testing fixture, including: a work box, a support and positioning component, and a testing component. The work box includes a working area and a non-working area, with the non-working area surrounding the working area. The support and positioning component is disposed on the work box; the side surface of the support and positioning component facing away from the work box is a placement surface for placing the test surface of the product to be tested; the testing component is disposed on the work box and includes an electrically connected test surface and a control element; in the height direction of the work box, the test surface is located at a preset position below the placement surface. The test surface is located above the working area, and the test surface can acquire the position signal of the test surface located above the test surface; the control element is configured to: when the test surface is placed on the placement surface of the support positioning component, if the test surface is in contact with the placement surface, the control element automatically determines that the flatness of the test surface is unqualified based on the first position signal acquired by the test surface; if there is a gap between the test surface and the placement surface in the height direction of the working box, the control element automatically determines that the flatness of the test surface is qualified based on the second position signal acquired by the test surface.

[0006] In some implementations, the support positioning component includes a support block and an electromagnet. The support block is disposed in the working area, and the electromagnet is disposed on the side of the support block away from the working box. The top surface of the support block away from the working box is the placement surface. In the height direction of the working box, the upper surface of the electromagnet is not higher than the placement surface. The material of the surface to be tested is metal, and the electromagnet is used to electrically connect to an external power source to fit the surface to be tested onto the placement surface.

[0007] In some implementations, the support block has a groove on its placement surface, the electromagnet is disposed in the groove, and the groove depth is greater than or equal to the thickness of the electromagnet in the height direction of the working box.

[0008] In some implementations, the bottom wall of the groove is provided with a first through hole, which penetrates the support block in the height direction of the working box, and the first through hole is used for the power line connected to the electromagnet to pass through.

[0009] In some implementations, the control element includes a time relay electrically connected to the electromagnet.

[0010] In some implementations, there are multiple support positioning components, which are spaced apart around the working area. Among the multiple support positioning components, all the placement surfaces are located on the same plane. The orthographic projection of the test surface in the working area is located in the middle of the orthographic projection of the multiple placement surfaces in the working area.

[0011] In some implementations, the working area is square, the number of supporting positioning components is four, and the supporting positioning components are located at the corners of the working area.

[0012] In some implementations, the control element includes a first relay that is electrically connected to the detection block.

[0013] In some implementations, the test component includes a shim block and a detection block, the shim block being disposed in the work area, the detection block being disposed above the shim block, and the top surface of the detection block away from the work box being the test surface.

[0014] In some implementations, a sensor is also included in the working area, positioned below the test surface in the height direction of the work box; the sensor is electrically connected to the control element, and the sensor is used to detect whether the product to be tested is placed on the placement surface.

[0015] In some implementations, the work box includes a box body and a fixture plate, the fixture plate being disposed on the upper surface of the box body, the fixture plate including the working area and the non-working area, and the fixture plate being detachably connected to the box body.

[0016] In some implementations, the fixture plate is provided with a limiting block located in the non-working area. The limiting block is used to restrict the movement of the product under test relative to the fixture plate in a direction perpendicular to the height direction of the working box.

[0017] In some implementations, the limiting block is an L-shaped sheet metal part, and the top surface of the limiting block in the height direction of the work box is higher than the placement surface; and / or, there are multiple limiting blocks, and the multiple limiting blocks are arranged at intervals around the work area.

[0018] In some implementations, the work box is provided with an indicator light, which is electrically connected to the control element; and / or, the work box is provided with a buzzer, which is electrically connected to the control element.

[0019] The beneficial effects of the flatness testing fixture provided in this application are as follows: Compared with related technologies, this application sets a support positioning component and a testing component on the work box, and sets the test surface in the testing component above the working area of ​​the work box. At the same time, in the height direction of the work box, the test surface is located at a preset position below the placement surface in the support positioning component. In this way, when the test surface of the product to be tested is placed on the placement surface, the test surface can obtain the position signal of the test surface above the test surface. If the test surface is in contact with the placement surface, the control element automatically judges that the flatness of the test surface is unqualified according to the first position signal obtained by the test surface; if there is a gap between the test surface and the placement surface in the height direction of the work box, the control element automatically judges that the flatness of the test surface is qualified according to the second position signal obtained by the test surface. Thus, the flatness of the test surface of the product to be tested is automatically detected, which not only improves the detection efficiency of the flatness of the test surface of the product to be tested, but also reduces the probability of misjudgment by the inspector and has strong versatility. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the assembly structure of the flatness testing fixture and the product to be tested provided in the embodiments of this application; Figure 2 yes Figure 1 An exploded view of the flatness testing fixture and the product under test. Figure 3 When the product to be tested is placed, Figure 1 A top view of the flatness testing fixture in the middle; Figure 4 When the product to be tested is not placed. Figure 1 A top view of the flatness testing fixture in the middle; Figure 5 yes Figure 1 A schematic diagram of the exploded structure of the flatness testing fixture in the image; Figure 6 When the product to be tested is placed, Figure 1 Side view of the flatness testing fixture in the middle; Figure 7 This is a schematic diagram of the support block structure in some embodiments of this application; Figure 8 This is a schematic diagram of the structure of the shim block in some embodiments of this application; Figure 9 yes Figure 1 The control flow chart of the flatness detection fixture.

[0022] Figure label: 10. Work box; 11. Box body; 12. Fixture plate; 121. Clearance opening; 13. Limit block; 20. Support and positioning component; 201. Placement surface; 21. Support block; 211. Groove; 212. First wire hole; 22. Electromagnet; 30. Test component; 301. Test surface; 31. Elevating block; 311. Second threading hole; 32. Detection block; 40. Control element; 401. Time relay; 402. First relay; 403. Second relay; 41. Sensor; 42. Indicator light; 421. Pass indicator light; 422. Fail indicator light; 200, Product to be tested; 210, Surface to be tested. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, as fixed connection, detachable connection, or integral connection; those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] Currently, after various stamping and forming processes, hardware products may fail to meet size requirements due to unreasonable mold size design, material stress release, and plastic deformation. This can easily lead to problems such as dimensional deviations and uneven surfaces, resulting in products that cannot meet usage needs.

[0028] In related technologies, to improve the precision of hardware products, the flatness of each surface is usually inspected after the hardware products are stamped and formed. Traditionally, the hardware products are placed on an inspection platform, and feeler gauges or feeler gauges are used to check the dimensions of each surface to be inspected. This inspection method is not only inefficient, but also requires a high level of skill from the operator, is subject to subjective judgment by the inspector, and is prone to misjudgment, resulting in poor inspection versatility.

[0029] To address the aforementioned issues, this application provides a flatness testing fixture.

[0030] The aforementioned flatness testing fixture can be used, but is not limited to, to test the flatness of the surface of hardware products. In other words, the product to be tested 200 can be, but is not limited to, metal parts such as hardware products. The following explanation will use hardware products as an example.

[0031] like Figures 1 to 4As shown, the flatness testing fixture includes: a work box 10, a support and positioning component 20, and a testing component 30. The work box 10 includes a working area and a non-working area, with the non-working area surrounding the working area. The support and positioning component 20 is mounted on the work box 10. The surface of the support and positioning component 20 facing away from the work box 10 is a placement surface 201, which is used to place the test surface 210 of the product to be tested 200. The testing component 30 is mounted on the work box 10 and includes a test surface 301 electrically connected to a control element 40. In the height direction of the work box 10, the test surface 301 is located at a preset position below the placement surface 201 and above the working area, that is... Both the test surface 301 and the placement surface 201 are located above the working area. The test surface 301 can acquire the position signal of the test surface 210 located above the test surface 301. The control element 40 is configured such that when the test surface 210 is placed on the placement surface 201 of the support positioning component 20, if the test surface 210 contacts the placement surface 201, the control element 40 automatically determines that the flatness of the test surface 210 is unqualified based on the first position signal acquired by the test surface 301. If there is a gap between the test surface 210 and the placement surface 201 in the height direction of the working box 10, the control element 40 automatically determines that the flatness of the test surface 210 is qualified based on the second position signal acquired by the test surface 301.

[0032] The aforementioned working area refers to the area where the orthographic projection of the area where the surface to be measured 210 is placed is located.

[0033] In the height direction of the work box 10, both the test surface 301 and the placement surface 201 are located above the work area, with the test surface 301 positioned below the placement surface 201 at a preset position. Thus, the inspector can directly place the product to be tested 200 on the placement surface 201. At this time, the lower surface of the test surface 210 is close to the test surface 301, and the control element 40 obtains the position signal of the test surface 210 above the test surface 301 through the test surface 301. The preset value of the aforementioned preset position refers to the height difference between the test surface 301 and the placement surface 201 in the height direction of the work box 10. This preset value needs to be determined by considering the position difference of the orthographic projections of the test surface 301 and the placement surface 201 in the work area and the flatness error of the test surface 210; no specific limitation is made here.

[0034] The control element 40 in the aforementioned test assembly 30 may be confined to the interior of the work chamber 10.

[0035] This application provides a support positioning component 20 and a test component 30 on the work box 10. The test surface 301 in the test component 30 is positioned above the working area of ​​the work box 10. Simultaneously, in the height direction of the work box 10, the test surface 301 is positioned below a preset value of the placement surface 201 in the support positioning component 20. Thus, when the surface to be tested 210 is placed on the placement surface 201, the test surface 301 can acquire the position signal of the surface to be tested 210 located above the test surface 301. If the surface to be tested 210 is in contact with the placement surface 201... If the test surface 210 is not flat, the control element 40 automatically determines that the flatness of the test surface 210 is unqualified based on the first position signal obtained from the test surface 301. If there is a gap between the test surface 210 and the placement surface 201 in the height direction of the work box 10, the control element 40 automatically determines that the flatness of the test surface 210 is qualified based on the second position signal obtained from the test surface 301. This achieves automatic detection of the flatness of the test surface 210, which not only improves the detection efficiency of the flatness of the test surface 210, but also reduces the probability of misjudgment by the inspector and has strong versatility.

[0036] The working area described above can be, but is not limited to, a square. Of course, the shape of the working area must match the shape of the surface 210 to be measured. The working area can also be a circle, a triangle, or other polygons, or it can be an irregular shape; no specific limitations are made here. The following explanation will use the example of a square working area and a square surface 210 to be measured.

[0037] like Figure 4 As shown, in this embodiment, the support positioning component 20 includes a support block 21 and an electromagnet 22. The support block 21 is disposed in the working area, and the electromagnet 22 is disposed on the side of the support block 21 away from the working box 10. The top surface of the support block 21 away from the working box 10 is the placement surface 201. In the height direction of the working box 10, the upper surface of the electromagnet 22 is not higher than the placement surface 201. The material of the surface to be tested 210 is metal, and the electromagnet 22 is used to electrically connect to an external power source to attach the surface to be tested 210 to the placement surface 201.

[0038] With the above settings, when the test surface 210 is placed on the placement surface 201, the electromagnet 22 is energized. Under the magnetic force of the electromagnet 22, the lower surface of the test surface 210 is in contact with the placement surface 201, thereby fixing the placement surface 201 and the test surface 210 relatively. This avoids the probability of the test product 200 moving relative to the placement surface 201 during the detection process, and improves the positioning accuracy and detection accuracy of the test surface 210.

[0039] like Figure 5 and Figure 7As shown, in this embodiment, a groove 211 is provided on the placement surface 201 of the support block 21, and the electromagnet 22 is disposed in the groove 211. In the height direction of the working box 10, the groove depth of the groove 211 is greater than or equal to the thickness of the electromagnet 22.

[0040] By providing a groove 211 on the placement surface 201 of the support block 21, and the groove depth of the groove 211 being greater than or equal to the thickness of the electromagnet 22, the upper surface of the electromagnet 22 will not protrude from the placement surface 201 when the electromagnet 22 is placed in the groove 211. This allows the lower surface of the surface to be measured 210 to be completely fitted with the placement surface 201, thereby further improving the positioning accuracy of the surface to be measured 210.

[0041] like Figure 7 As shown, in this embodiment, the bottom wall of the groove 211 is provided with a first wire hole 212. The first wire hole 212 passes through the support block 21 in the height direction of the working box 10, and is used for the power line connected to the electromagnet 22 to pass through. In this way, the power line is not exposed too much outside the support block 21, which would affect the overall detection accuracy and aesthetics of the fixture, thereby indirectly improving the overall detection accuracy and aesthetics of the flatness detection fixture.

[0042] like Figure 2 and Figure 5 As shown, in this embodiment, there are four support positioning components 20. The support positioning components 20 are provided at the corner of the work area. The placement surfaces 201 of the four support positioning components 20 are located on the same plane. The orthographic projection of the test surface 301 in the work area is located in the middle of the orthographic projections of the multiple placement surfaces 201 in the work area.

[0043] By setting support positioning components 20 at the corners of the work area, the placement surfaces 201 of the four support positioning components 20 are located on the same plane, providing a reference surface with high flatness for the product under test 200. When the product under test 200 is placed on the placement surface 201, it is beneficial to further improve the accuracy of flatness detection of the surface under test 210.

[0044] It should be noted that the number of support positioning components 20 can be four, or three, four, five, six, seven, eight, or other numbers. Multiple support positioning components 20 are arranged at intervals around the work area. Among the multiple support positioning components 20, all the placement surfaces 201 are located on the same plane, that is, all the placement surfaces 201 are coplanar.

[0045] As shown in the figure Figure 5 and Figure 9 As shown, in this embodiment, the control element 40 includes a time relay 401, which is electrically connected to the electromagnet 22.

[0046] The aforementioned time relay 401 is a special type of relay that operates or resets after a certain delay following an input signal, and is used in applications requiring time control. A relay is an electrically controlled switch that controls the connection or disconnection of a high-current circuit through a small current signal, achieving circuit isolation, amplification, or logic control.

[0047] In this embodiment, the electromagnet 22 is automatically controlled by the time relay 401. This saves costs.

[0048] like Figure 2 and Figure 5 As shown, in this embodiment, the test component 30 includes a shim block 31 and a detection block 32. The shim block 31 is disposed in the working area, and the detection block 32 is disposed above the shim block 31. The top surface of the detection block 32 away from the working box 10 is the test surface 301.

[0049] With the above settings, the flatness of the test surface 210 of different sizes can be tested by using test components 30 with different height shims 31 without changing the structure of the test block 32, which is highly versatile.

[0050] like Figure 2 , Figure 5 and Figure 9 As shown, in this embodiment, the control element 40 includes a first relay 402, which is electrically connected to the detection block 32. Thus, the detection block 32 achieves automatic control through the first relay 402.

[0051] like Figure 5 , Figure 8 and Figure 9 As shown, in this embodiment, the raised block 31 has a second wire hole 311, which is used for the connection wire of the detection block 32 and the first relay 402 to pass through.

[0052] like Figure 4 , Figure 5 and Figure 9As shown, in this embodiment, a sensor 41 is also included, which is located below the test surface 301 in the height direction of the work box 10. The sensor 41 is electrically connected to the control element 40 and is used to detect whether the product to be tested 200 is placed on the placement surface 201. That is, when the sensor 41 detects that the product to be tested 200 is placed on the placement surface 201, the sensor 41 sends the acquired product presence signal to the control element 40, and then the control element 40 controls the test assembly 30 to be in working state; when the sensor 41 does not detect that the product to be tested 200 is placed on the placement surface 201, the sensor 41 sends the acquired product absence signal to the control element 40, and then the detection assembly is in a test-ready state.

[0053] The aforementioned sensor 41 not only reduces the energy consumption of the detection components in the flatness detection fixture, thereby extending the service life of the flatness detection fixture, but also, by placing the sensor 41 below the test surface 301 in the height direction of the work box 10, the probability of mutual interference between the sensor 41 and the detection surface is reduced, thereby improving the reliability of the flatness detection fixture.

[0054] like Figure 5 and Figure 9 As shown, in this embodiment, the control element 40 includes a second relay 403, which is electrically connected to the sensor 41. That is, the sensor 41 is controlled by the second relay 403.

[0055] It should be noted that the second sensor 41 and the first sensor 41 mentioned above may be, but are not limited to, the same sensor 41, or the second sensor 41 and the first sensor 41 may be two separate sensors 41. The second sensor 41 and the first sensor 41 are two sensors 41 that can respectively realize the control of the detection block 32 and the sensor 41. The structures of the two sensors 41 may be the same or different.

[0056] like Figure 5 As shown, in this embodiment, the work box 10 includes a box body 11 and a fixture plate 12. The fixture plate 12 is disposed on the upper surface of the box body 11 and includes a working area and a non-working area. The fixture plate 12 is detachably connected to the box body 11.

[0057] By designing the fixture plate 12 and the housing 11 to be detachably connected, it is not only convenient to assemble the fixture plate 12 and the housing 11 and to inspect and replace the components inside the housing 11, such as the control element 40; at the same time, by setting both the working area and the non-working area on the fixture plate 12, it is possible to test products 200 of different sizes and models without changing the housing 11, simply by changing the fixture plate 12 and adjusting the positions of the support positioning component 20 and the test component 30 on the fixture plate 12. This requires minimal modification, has low cost, and is highly versatile.

[0058] like Figure 5 As shown, in this embodiment, the fixture plate 12 is provided with a clearance opening 121, the control element 40 is disposed inside the housing 11, the test surface 301 of the test component 30 can be located above the working area through the clearance opening 121, and the connecting line between the test surface 301 and the control element 40 can be electrically connected through the clearance opening 121.

[0059] like Figure 2 , Figure 3 and Figure 5 As shown, in this embodiment, a limiting block 13 is provided on the fixture plate 12. The limiting block 13 is located in the non-working area and is used to restrict the movement of the product under test 200 relative to the fixture plate 12 in a direction perpendicular to the height direction of the working box 10. In this way, the product under test 200 can be fixed relative to the fixture plate 12, thereby improving the accuracy of the test.

[0060] like Figure 5 As shown, in this embodiment, the limiting block 13 is an L-shaped sheet metal part, and the top surface of the limiting block 13 in the height direction of the work box 10 is higher than the placement surface 201.

[0061] The limiting block 13 is an L-shaped sheet metal part, which makes the processing of the limiting block 13 simple and saves costs. At the same time, the top surface of the limiting block 13 in the height direction of the work box 10 is higher than the placement surface 201. Thus, when the product to be tested 200 is placed on the placement surface 201, the limiting block 13 can protect the product to be tested 200 well and reduce the risk of the product to be tested 200 slipping off the placement surface 201.

[0062] like Figure 3 and Figure 5 As shown, in this embodiment, the number of limiting blocks 13 is eight. When configured, the eight limiting blocks 13 can be arranged at intervals around the work area. Limiting blocks 13 can be provided on two adjacent sides at each corner of the work area, but are not limited to this. In this way, the use of limiting blocks 13 is reduced while maintaining accurate positioning, thereby saving costs.

[0063] By setting the above, the movement of the product under test 200 relative to the fixture plate 12 in both the length and width directions can be restricted, so that the product under test 200 and the fixture plate 12 are accurately positioned, which helps to improve the accuracy of the flatness detection of the surface under test 210.

[0064] It should be noted that the product under test 200 is perpendicular to each other in the length and width directions and in the height direction of the working box 10.

[0065] Of course, the number of limit blocks 13 can be eight, or two, three, four, five, six, seven, nine, ten, etc., so that when the product to be tested 200 is placed on the placement surface 201, there is at least one limit block 13 in both the length and width directions of the product to be tested 200.

[0066] like Figure 4 and Figure 5 As shown, in this embodiment, the work box 10 is provided with an indicator light 42, which is electrically connected to the control element 40.

[0067] The aforementioned indicator light 42 typically includes a pass indicator light 421 and a fail indicator light 422. The pass indicator light 421 is typically green, and the fail indicator light 422 is red.

[0068] This design allows inspectors to visually determine whether the flatness of the surface 210 under test is qualified by observing the on / off status of the qualification indicator light 421. This facilitates inspectors in checking the flatness of the surface 210 under test and reduces the risk of misjudgment.

[0069] To further improve the efficiency of the inspector's judgment, in some embodiments, the work box 10 is equipped with a buzzer, which is electrically connected to the control element 40.

[0070] The buzzer is electrically connected to the control element 40. Thus, when the flatness of the surface 210 being tested fails the test, the failure indicator 422 illuminates and the buzzer sounds, which can greatly alert the inspector and reduce the risk of the inspector missing a result.

[0071] In this embodiment, the red defect indicator light 422 integrates the function of a buzzer. That is, when the flatness of the surface to be tested 210 fails the test, the defect indicator light 422 lights up and the buzzer sounds, which simplifies the structure of the flatness testing fixture.

[0072] It should be noted that the above-mentioned control element 40 can be implemented by the following control method, which includes: The test surface 210 of the product to be tested 200 is placed on the placement surface 201 of the support and positioning component 20 of the flatness testing fixture; If the surface to be tested 210 comes into contact with the placement surface 201, the control element 40 of the flatness testing fixture will automatically determine that the flatness of the surface to be tested 210 is unqualified based on the first position signal obtained by the test surface 301 of the flatness testing fixture. If there is a gap between the test surface 210 and the placement surface 201 in the height direction of the working box 10, the control element 40 automatically determines that the flatness of the test surface 210 is qualified based on the second position signal obtained from the test surface 301.

[0073] It should be noted that the control method of the flatness testing fixture described above is used for the flatness testing fixture. The structure of the flatness testing fixture and the effect obtained are the same as those in the above embodiments, and will not be repeated here.

[0074] like Figure 9 As shown, the working process of the flatness testing fixture in this embodiment is as follows: Place the test surface 210 of the product to be tested 200 on the placement surface 201; When sensor 41 detects the product under test 200 while it is powered on, it transmits the signal of the product under test 200 to time relay 401 through a relay. When time relay 401 is powered on, it controls electromagnet 22 to be powered on and attracted. At this time, the test surface 210 is attracted downward by the electromagnet 22 until the lower surface of the test surface 210 is in contact with the placement surface 201. Once the electromagnet 22 has attracted the product, if the lower surface of the test surface 210 contacts the test surface 301 of the test block, the circuit is connected. At this time, the failure indicator 422 lights up and the buzzer sounds an alarm, indicating that the flatness test of the test surface 210 of the product under test 200 is unqualified. If the lower surface of the test surface 210 does not contact the test surface 301 of the test block, the pass indicator 421 lights up, indicating that the flatness test of the test surface 210 of the product under test 200 is qualified.

[0075] The energizing and magnetizing time of the electromagnet 22 can be set to, but is not limited to, 1.5 seconds.

[0076] It should be noted that after a test product 200 is completed, the electromagnet 22 is energized and magnetized against the test surface 210 under the action of the time relay 401 for a period of time. After the energization and magnetization time ends, the electromagnet 22 is de-energized and demagnetized. The test product 200 is then manually removed to the next workstation, and then the next test product 200 is placed, and so on in a cycle.

[0077] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A flatness testing fixture, characterized in that, include: A work box (10) includes a work area and a non-work area, the non-work area being located around the work area; A support positioning component (20) is disposed on the work box (10); the side surface of the support positioning component (20) facing away from the work box (10) is a placement surface (201), and the placement surface (201) is used to place the test surface (210) of the product to be tested (200). A test component (30) is disposed on the work box (10). The test component (30) includes a test surface (301) and a control element (40) that are electrically connected. In the height direction of the work box (10), the test surface (301) is located at a preset position below the placement surface (201). The test surface (301) is located above the work area. The test surface (301) can acquire the position signal of the test surface (210) located above the test surface (301). The control element (40) is configured such that: when the test surface (210) is placed on the placement surface (201) of the support positioning assembly (20), if the test surface (210) contacts the placement surface (201), the control element (40) automatically determines that the flatness of the test surface is unqualified based on the first position signal obtained from the test surface (301); if the test surface (210) and the placement surface (201) have a gap between them in the height direction of the work box (10), the control element (40) automatically determines that the flatness of the test surface is qualified based on the second position signal obtained from the test surface (301).

2. The flatness testing fixture according to claim 1, characterized in that, The support positioning component (20) includes a support block (21) and an electromagnet (22). The support block (21) is located in the working area, and the electromagnet (22) is located on the side of the support block (21) away from the working box (10). The top surface of the support block (21) away from the working box (10) is the placement surface (201). In the height direction of the working box (10), the upper surface of the electromagnet (22) is not higher than the placement surface (201). The material of the surface to be tested (210) is metal. The electromagnet (22) is used to connect to an external power source to attach the surface to be tested (210) to the placement surface (201).

3. The flatness testing fixture according to claim 2, characterized in that, The support block (21) has a groove (211) on its placement surface (201), and the electromagnet (22) is disposed in the groove (211). In the height direction of the work box (10), the groove depth of the groove (211) is greater than or equal to the thickness of the electromagnet (22).

4. The flatness testing fixture according to claim 3, characterized in that, The bottom wall of the groove (211) is provided with a first through hole (212), which passes through the support block (21) in the height direction of the working box (10). The first through hole (212) is used for the power line connected to the electromagnet (22) to pass through.

5. The flatness testing fixture according to claim 4, characterized in that, The control element (40) includes a time relay (401) which is electrically connected to the electromagnet (22).

6. The flatness testing fixture according to claim 2, characterized in that, The number of the support positioning components (20) is multiple, and the multiple support positioning components (20) are arranged at intervals around the working area. Among the multiple support positioning components (20), all the placement surfaces (201) are located on the same plane. The test surface (301) is projected onto the working area at the center of the projection of the plurality of placement surfaces (201) onto the working area.

7. The flatness testing fixture according to claim 6, characterized in that, The work area is square, and there are four support positioning components (20). The support positioning components (20) are located at the corners of the work area.

8. The flatness testing fixture according to any one of claims 1 to 7, characterized in that, The test component (30) includes a shim block (31) and a test block (32). The shim block (31) is located in the work area, and the test block (32) is located above the shim block (31). The top surface of the test block (32) away from the work box (10) is the test surface (301).

9. The flatness testing fixture according to claim 8, characterized in that, The control element (40) includes a first relay (402) which is electrically connected to the detection block (32).

10. The flatness testing fixture according to any one of claims 1 to 7, characterized in that, It also includes a sensor (41) disposed in the working area, and the sensor (41) is located below the test surface (301) in the height direction of the working box (10); The sensor (41) is electrically connected to the control element (40), and the sensor (41) is used to detect whether the product to be tested (200) is placed on the placement surface (201).

11. The flatness testing fixture according to any one of claims 1 to 7, characterized in that, The work box (10) includes a box body (11) and a fixture plate (12). The fixture plate (12) is disposed on the upper surface of the box body (11). The fixture plate (12) includes the working area and the non-working area. The fixture plate (12) is detachably connected to the box body (11).

12. The flatness testing fixture according to claim 11, characterized in that, The fixture plate (12) is provided with a limiting block (13), which is located in the non-working area. The limiting block (13) is used to restrict the product to be tested (200) from moving relative to the fixture plate (12) in a direction perpendicular to the height direction of the working box (10).

13. The flatness testing fixture according to claim 12, characterized in that, The limiting block (13) is an L-shaped sheet metal part, and the top surface of the limiting block (13) in the height direction of the work box (10) is higher than the placement surface (201). And / or, the number of the limiting blocks (13) is multiple, and the multiple limiting blocks (13) are arranged at intervals around the working area.

14. The flatness testing fixture according to any one of claims 1 to 7, characterized in that, The work box (10) is provided with an indicator light (42), which is electrically connected to the control element (40); And / or, the work box (10) is provided with a buzzer, which is electrically connected to the control element (40).

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