Limiting device and test equipment
By designing limiting devices and pressure sensing components in the test equipment, the problem of inadequate placement of the material box is solved, and the efficient operation and mass production requirements of the equipment are achieved.
Patent Information
- Application Number
- CN202421992487.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The existing test equipment cannot effectively identify whether the material box is placed in place, resulting in the equipment operating time not meeting the standards and cannot meet the mass production needs.
A limiting device is designed, with multiple limiting areas of different sizes on the base, equipped with pressure sensing components, and the pressure sensor is set in the limiting area, and the pressure sensor is used to determine whether the material box is placed correctly.
Check whether the material box is placed in place through the limit device, which improves the operating efficiency of the test equipment and meets mass production needs.
Smart Images
Figure CN223216864U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of testing equipment, and in particular to a limiting device and testing equipment. Background Art
[0002] In test equipment, it is usually necessary to place a Wafer Cassette (wafer material box) or a Frame Cassette (iron ring material box) in the equipment. In traditional test equipment, it is impossible to effectively identify whether the material box is placed in place, resulting in the equipment's operating time not meeting the standards and failing to meet mass production needs during the production process using the test equipment. Utility Model Content
[0003] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a limiting device that can confirm whether the material box is placed in place.
[0004] To achieve the above objectives, the technical solutions adopted in this application are as follows:
[0005] According to the embodiment of the first aspect of the present application, the limiting device includes: a base, the base is provided with a plurality of limiting areas of different sizes, different limiting areas correspond to material boxes of different sizes, at least part of the edge of the material box is against the edge of the limiting area; a pressure sensing assembly, the pressure sensing assembly includes a plurality of pressure sensors, the pressure sensors are arranged on the base, and there is at least one pressure sensor in each limiting area; wherein, each material box is pressed on each pressure sensor in the limiting area where it is located.
[0006] The limiting device of the utility model has the following advantages:
[0007] In the above-mentioned limiting device, material boxes of different sizes can be set in different limiting areas. At the same time, if the material box is placed in place, the material box can be pressed on each pressure sensor in the limiting area where it is located. In this way, it is possible to determine whether the material box is placed correctly through the pressure sensor. If the material box is placed correctly, it will offset each pressure sensor in the limiting area where it is located, so that the pressure sensor can output a pressure signal to the control device. In this way, it is possible to confirm whether the material box is placed in place through the above-mentioned limiting device.
[0008] According to the limiting device of the first aspect embodiment of the present application, the base has a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are symmetrically arranged along a vertical line, and at least a portion of the edge of one end of each material box along the vertical line is against the first limiting portion, and at least a portion of the edge of the other end of each material box along the vertical line is against the second limiting portion.
[0009] According to the limiting device of the first aspect embodiment of the present application, the first limiting portion is provided with a limiting groove, the limiting groove is symmetrically arranged along the vertical line, and one end of the material box along the vertical line is abutted against the groove wall of the limiting groove in the limiting area where it is located.
[0010] According to the limiting device of the first aspect embodiment of the present application, the second limiting portion is provided with a plurality of first limiting steps, each of the first limiting steps is symmetrically arranged along the vertical line, and the material box is offset against the first limiting step of the limiting area where it is located.
[0011] According to the limiting device of the embodiment of the first aspect of the present application, the base also has a third limiting portion, the third limiting portion is symmetrically arranged along the vertical line, and the third limiting portion is located between the first limiting portion and the second limiting portion, and a limiting gap is provided between the third limiting portion and the second limiting portion, and one of the side walls of each of the material boxes is arranged in the limiting gap and is against the second limiting portion and the third limiting portion.
[0012] According to the limiting device of the embodiment of the first aspect of the present application, the pressure sensor includes multiple first pressure sensors and at least one second pressure sensor, each of the first pressure sensors is arranged at a first limiting step, and the second pressure sensor is arranged in the limiting gap.
[0013] According to the limiting device of the first aspect embodiment of the present application, the base also includes multiple groups of fourth limiting parts, each group of the fourth limiting parts is symmetrically arranged along the vertical line, and the two ends of the material box along the horizontal line are offset against a group of the fourth limiting parts in the area where it is located.
[0014] According to the limiting device of the embodiment of the first aspect of the present application, each group of the fourth limiting parts is provided with a second limiting step, the second limiting step is symmetrically arranged along the vertical line, and both ends of the material box along the horizontal line are offset against the second limiting steps of the limiting area where it is located.
[0015] According to the limiting device of the embodiment of the first aspect of the present application, the pressure sensor further includes a third pressure sensor and multiple groups of fourth pressure sensors, the third pressure sensor is arranged on the vertical line, and each group of the fourth pressure sensors is symmetrically arranged along the vertical line;
[0016] Wherein, the material box is pressed on the third pressure sensor and simultaneously pressed on the fourth pressure sensor in the limiting area where the material box is located.
[0017] The testing equipment according to the embodiment of the second aspect of the present application includes: the limiting device as described above.
[0018] The testing equipment of the utility model has the following advantages:
[0019] In the above-mentioned testing equipment, since the above-mentioned limiting device can confirm whether the material box is placed in place, the above-mentioned testing equipment can have a better operating effect to meet the mass production needs during the production process. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.
[0021] Figure 1 A schematic structural diagram of a position limiting device according to Example 1 of the present application is shown;
[0022] Figure 2 The schematic diagram of the connection structure between the limiting device and the material box in Example 1 of the present application is shown. Figure 1 ;
[0023] Figure 3 The schematic diagram of the connection structure between the limiting device and the material box in Example 1 of the present application is shown. Figure 2 ;
[0024] Figure 4 The schematic diagram of the connection structure between the limiting device and the material box in Example 1 of the present application is shown. Figure 3 ;
[0025] Figure 5 A schematic structural diagram of a position limiting device according to Example 2 of the present application is shown;
[0026] Figure 6 The schematic diagram of the connection structure between the limiting device and the material box of Example 2 of the present application is shown. Figure 1 ;
[0027] Figure 7 The schematic diagram of the connection structure between the limiting device and the material box of Example 2 of the present application is shown. Figure 2 .
[0028] Description of main component symbols:
[0029] 100 - base; 110 - limiting area; 120 - first limiting portion; 121 - limiting groove; 130 - second limiting portion; 131 - first limiting step; 140 - third limiting portion; 150 - limiting gap; 160 - fourth limiting portion; 161 - second limiting step;
[0030] 200 - pressure sensing assembly; 210 - first pressure sensor; 220 - second pressure sensor; 230 - third pressure sensor; 240 - fourth pressure sensor. DETAILED DESCRIPTION
[0031] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.
[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0033] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0034] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.
[0035] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0036] Reference Figure 1 as well as Figure 5 As shown, the limiting device involved in the embodiment of the present application includes: a base 100 and a pressure sensing component 200.
[0037] Specifically, the base 100 is provided with a plurality of limiting areas 110 of different sizes, and different limiting areas 110 correspond to material boxes of different sizes, and at least part of the edge of the material box is against the edge of the limiting area 110; the pressure sensing component 200 includes a plurality of pressure sensors, and the pressure sensors are arranged on the base 100, and there is at least one pressure sensor in each limiting area 110; wherein, each material box is pressed on each pressure sensor in the limiting area 110 where it is located.
[0038] Specifically, in the above-mentioned embodiment, the testing device has a control device (not shown) and a display device (not shown), and the pressure sensor and the display device are electrically connected to the control device. When the pressure sensor is in contact with the material box, the pressure sensor will output a pressure signal to the control device. When the control device receives the pressure signal, it will control the display device to display information that the material box is correctly placed.
[0039] In the limiting device of the present application, material boxes of different sizes can be set in different limiting areas 110. At the same time, if the material box is placed in place, the material box can be pressed on each pressure sensor in the limiting area 110 where it is located. In this way, it is possible to determine whether the material box is placed correctly through the pressure sensor. If the material box is placed correctly, it will offset each pressure sensor in the limiting area 110 where it is located, so that the pressure sensor can output a pressure signal to the control device. In this way, it is possible to confirm whether the material box is placed in place through the above-mentioned limiting device.
[0040] Example 1:
[0041] In embodiment 1, the material box is a wafer cassette, that is, a wafer material box.
[0042] Reference Figure 2 、 Figure 3 as well as Figure 4As shown, the base 100 has a first limiting portion 120 and a second limiting portion 130. The first limiting portion 120 and the second limiting portion 130 are symmetrically arranged along a vertical line, and at least a portion of the edge of one end of each material box along the vertical line is against the first limiting portion 120, and at least a portion of the edge of the other end of each material box along the vertical line is against the second limiting portion 130.
[0043] Specifically, in Example 1, the first limiting portion 120 includes two first limiting sub-portions, which are arranged on the base 100 in the horizontal direction and symmetrically arranged along the vertical line. The two first limiting sub-portions are both against one end of the material box along the vertical line. The second limiting portion 130 includes two second limiting sub-portions, which are arranged on the base 100 in the horizontal direction and symmetrically arranged along the vertical line. The two second limiting sub-portions are both against the other end of the material box along the vertical line. In this way, the material box can be kept balanced in the horizontal direction by multiple first limiting portion 120 sub-portions and multiple second limiting sub-portions.
[0044] In this embodiment, since at least part of the edge of one end of each material box along the vertical line is against the first limiting portion 120, and at least part of the edge of the other end of each material box along the vertical line is against the second limiting portion 130, the material box can be placed in the limiting area 110 between the second limiting portion 130 and the first limiting portion 120, so that the two ends of the material box along the vertical line are limited by the first limiting portion 120 and the second limiting portion 130, so that the material box has a fixed installation position.
[0045] Continue to refer to Figure 2 、 Figure 3 as well as Figure 4 As shown, the first limiting portion 120 is provided with a limiting groove 121, which is symmetrically arranged along the vertical line. One end of the material box along the vertical line is against the groove wall of the limiting groove 121 in the limiting area 110 where it is located.
[0046] Specifically, in Example 1, each first limiting section is provided with a plurality of limiting sub-grooves. In each first limiting section, a plurality of limiting sub-grooves are arranged at intervals along a vertical line, and each limiting sub-groove is located at the edge of a limiting area 110. Each material box is abutted against the groove wall of one of the limiting sub-grooves and does not interfere with the remaining limiting sub-grooves. The limiting sub-grooves of one first limiting section and the limiting sub-grooves of another first limiting section are symmetrically arranged one by one with respect to the vertical line to form a limiting groove 121, so that the material box can be abutted against the limiting sub-grooves of the two first limiting sections at the same time.
[0047] In this embodiment, when the material box is placed in the limiting area 110, the limiting groove 121 can be used to limit one end of the vertical line of the material box to fix the placement position of the material box, thereby ensuring that the material box can be installed in place and limiting the displacement of the material box in the vertical direction.
[0048] Continue to refer to Figure 2 、 Figure 3 as well as Figure 4 As shown, the second limiting portion 130 is provided with a plurality of first limiting steps 131 , each of the first limiting steps 131 is symmetrically arranged along a vertical line, and the material box and the first limiting step 131 of the limiting area 110 where it is located are offset.
[0049] Specifically, in Example 1, each second limiting division is provided with a plurality of first limiting step 131 divisions, and in each second limiting division, a plurality of first limiting step 131 divisions are arranged along a vertical line, and each first limiting step 131 division is located at the edge of a limiting area 110, and each material box is offset against one of the first limiting step 131 divisions and does not interfere with the remaining first limiting step 131 divisions; the first limiting step 131 division of one second limiting division and the first limiting step 131 division of another second limiting division are symmetrically arranged one by one with respect to the vertical line to form a first limiting step 131, so that the material box can be offset against the first limiting step 131 divisions of two second limiting divisions at the same time; in the vertical direction, the distance between the two first limiting step 131 divisions of the same first limiting step 131 gradually increases toward the direction away from the center of the base 100 to accommodate material boxes of different sizes.
[0050] It can be understood that when the material box is placed in the limiting area 110, the first limiting step 131 and the limiting groove 121 can be used to limit the two ends of the material box along the vertical line to fix the placement position of the material box, thereby ensuring that the material box can be installed in place. In this process, one end of the material box along the vertical line is against the groove walls of the two limiting grooves symmetrically arranged along the vertical line, and the other end of the material box along the vertical line is against the two first limiting steps 131 symmetrically arranged along the vertical line. In this way, the displacement of the material box on the vertical line can be limited, and at the same time, the displacement of the material box on the horizontal line can be limited, so as to fix the material box.
[0051] Reference Figures 1 to 4As shown, in Example 1, the base 100 also has a third limiting portion 140, the third limiting portion 140 is symmetrically arranged along the vertical line, and the third limiting portion 140 is located between the first limiting portion 120 and the second limiting portion 130, and a limiting gap 150 is provided between the third limiting portion 140 and the second limiting portion 130, and one of the side walls of each material box is arranged in the limiting gap 150, and is against the second limiting portion 130 and the third limiting portion 140.
[0052] In this embodiment, one of the side walls of each material box can be set in the limiting gap 150. In this way, the edges of the material box can be limited according to the edge shape of the material box through the first limiting portion 120, the second limiting portion 130 and the third limiting portion 140 to determine the installation position of the material box.
[0053] Reference Figure 2 、 Figure 3 as well as Figure 4 As shown, the pressure sensor includes multiple first pressure sensors 210 and at least one second pressure sensor 220 . Each first pressure sensor 210 is disposed at a first limiting step 131 , and the second pressure sensor 220 is disposed in the limiting gap 150 .
[0054] In this embodiment, when the material box is located in the limiting area 110, the material box will be against the first pressure sensor 210 at the first limiting step 131 in the limiting area 110 where it is located, so as to confirm whether the material box is against the first limiting step 131 through the first pressure sensor 210, thereby confirming the installation position of the material box. At the same time, the material box will also be against the second pressure sensor 220 in the limiting gap 150, so as to confirm the positional relationship between the material box and the limiting gap 150. In this way, the material box can be confirmed by the first pressure sensor 210 and the second pressure sensor 220. The box is installed in place at multiple positions at the same time to confirm whether the box is installed in place. At the same time, when the box is against the first pressure sensor 210 at the first limiting step 131 in the limiting area 110 where it is located, the box will also be spaced apart from the first pressure sensors 210 in other limiting areas 110. Therefore, it can avoid that a box of one size interferes with the pressure sensors corresponding to boxes of other sizes during the placement process, thereby ensuring the accuracy of the pressure signal output by the pressure sensor, and further ensuring the accuracy of the information on whether the box is correctly placed.
[0055] Example 2:
[0056] In Example 2, the material box is a Frame Cassette, that is, an iron ring material box.
[0057] Reference Figure 6 as well as Figure 7As shown, the base 100 also includes multiple groups of fourth limiting parts 160, each group of fourth limiting parts 160 is symmetrically arranged along the vertical line, and the two ends of the material box along the horizontal line are offset against a group of fourth limiting parts 160 in the area where it is located.
[0058] Specifically, in Example 2, each group of fourth limiting portions 160 includes two fourth limiting portions 160 , and the two fourth limiting portions 160 are symmetrically arranged along a vertical line.
[0059] Specifically, in Example 2, in the vertical direction, the distance between two fourth limiting portions 160 of the same group of fourth limiting portions 160 gradually increases in a direction away from the center of the base 100 to accommodate material boxes of different sizes.
[0060] In this embodiment, since the two ends of the material box along the horizontal line are offset against a group of fourth limiting parts 160 in the area where it is located, the material box can be limited by the fourth limiting parts 160 so that the material box can be placed in the limiting area 110 between a group of fourth limiting parts 160.
[0061] Continue to refer to Figure 6 as well as Figure 7 As shown, each set of fourth limiting parts 160 is provided with a second limiting step 161, and the second limiting steps 161 are symmetrically arranged along the vertical line. Both ends of the material box along the horizontal line are against the second limiting steps 161 of the limiting area 110 where it is located.
[0062] Specifically, in the above embodiment, each fourth limiting portion 160 is provided with a second limiting step 161, and the two second limiting steps 161 are symmetrically arranged along the vertical line, so that the two second limiting steps 161 symmetrically arranged along the vertical line can both offset the two ends of the material box along the horizontal line.
[0063] In this embodiment, since both ends of the material box along the horizontal line are against the second limiting steps 161 of the limiting area 110 where it is located, the position of the material box on the horizontal line can be limited by the material box and the second limiting step 161, so as to determine the placement position of the material box. At the same time, when the material box is against the second limiting step 161 of the limiting area 110 where it is located, the material box and the second limiting steps 161 of other limiting areas 110 can be spaced apart, so that material boxes of different sizes can have corresponding second limiting steps 161 against them, so as to confirm the installation position of the material box and facilitate the installation of the material box.
[0064] Continue to refer to Figure 6 as well as Figure 7As shown, the pressure sensor also includes a third pressure sensor 230 and multiple groups of fourth pressure sensors 240. The third pressure sensor 230 is arranged on a vertical line, and each group of fourth pressure sensors 240 is symmetrically arranged along the vertical line; wherein, the material box is pressed on the third pressure sensor 230, and at the same time pressed on the fourth pressure sensor 240 in the limiting area 110 where it is located.
[0065] Specifically, in Example 2, each group of fourth pressure sensors 240 includes two fourth pressure sensors 240 , and the two fourth pressure sensors 240 are symmetrically arranged along a vertical line.
[0066] Specifically, in Example 2, in the vertical direction, the distance between two fourth pressure sensors 240 in the same group of fourth pressure sensors 240 gradually increases in a direction away from the center of the base 100 to accommodate material boxes of different sizes.
[0067] In this embodiment, since the third pressure sensor 230 is arranged on the vertical line and the material box is pressed on the third pressure sensor 230, the third pressure sensor 230 can be used to detect whether one of the positions of the material box is installed in place. At the same time, since each group of fourth pressure sensors 240 is symmetrically arranged along the vertical line, and the material box is pressed on the fourth pressure sensor 240 in the limiting area 110 where it is located, the fourth pressure sensor 240 can be used to detect whether the other two positions of the material box are installed in place. The third pressure sensor 230 and the fourth pressure sensor 240 can be used to locate multiple points of the material box, so as to locate the installation position of the material box to determine whether the material box is placed in place.
[0068] Specifically, the Wafer Cassette in Example 1 is heavier, and the Frame Cassette in Example 2 is lighter. Therefore, when placing the Wafer Cassette, it is necessary to set limiting portions at both ends of the Wafer Cassette along the vertical line to limit and fix the Wafer Cassette. When placing the Frame Cassette, it is only necessary to set a limiting portion at one end of the Frame Cassette along the vertical line and set a pressure sensor along the other end of the vertical line to position it. This can reduce the manufacturing difficulty of the limiting device used in the Frame Cassette and reduce the cost at the same time.
[0069] The testing equipment involved in the embodiment of the present application includes: the above-mentioned limiting device.
[0070] In the above-mentioned testing equipment, since the above-mentioned limiting device can confirm whether the material box is placed in place, the above-mentioned testing equipment can have a better operating effect to meet the mass production needs during the production process.
[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.
[0072] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A limiting device, characterized in that: include: A base, wherein the base is provided with a plurality of limiting areas of different sizes, wherein different limiting areas correspond to magazines of different sizes, and at least part of the edge of the magazine abuts against the edge of the limiting area; A pressure sensing assembly, the pressure sensing assembly comprising a plurality of pressure sensors, the pressure sensors being arranged on the base, and at least one pressure sensor being located in each of the limiting areas; Wherein, each of the material boxes is pressed onto each of the pressure sensors in the limiting area where it is located.
2. The limiting device according to claim 1, characterized in that: The base has a first limiting portion and a second limiting portion, and the first limiting portion and the second limiting portion are symmetrically arranged along a vertical line, and at least a portion of the edge of one end of each material box along the vertical line is against the first limiting portion, and at least a portion of the edge of the other end of each material box along the vertical line is against the second limiting portion.
3. The limiting device according to claim 2, characterized in that: The first limiting portion is provided with a limiting groove, and the limiting groove is symmetrically arranged along the vertical line. One end of the material box along the vertical line is against the groove wall of the limiting groove in the limiting area where it is located.
4. The limiting device according to claim 3, characterized in that: The second limiting portion is provided with a plurality of first limiting steps, each of which is symmetrically arranged along the vertical line, and the material box is offset against the first limiting step of the limiting area where it is located.
5. The limiting device according to claim 4, characterized in that: The base also has a third limiting portion, which is symmetrically arranged along the vertical line and located between the first limiting portion and the second limiting portion. A limiting gap is provided between the third limiting portion and the second limiting portion, and one of the side walls of each of the material boxes is arranged in the limiting gap and is against the second limiting portion and the third limiting portion.
6. The limiting device according to claim 5, characterized in that: The pressure sensor includes a plurality of first pressure sensors and at least one second pressure sensor. Each of the first pressure sensors is arranged at one of the first limiting steps, and the second pressure sensor is arranged in the limiting gap.
7. The limiting device according to claim 1, characterized in that: The base further comprises a plurality of groups of fourth limiting parts, each group of the fourth limiting parts is symmetrically arranged along a vertical line, and both ends of the material box along the horizontal line are offset against a group of the fourth limiting parts in the area where the box is located.
8. The limiting device according to claim 7, characterized in that: Each group of the fourth limiting parts is provided with a second limiting step, and the second limiting steps are symmetrically arranged along the vertical line. Both ends of the material box along the horizontal line are offset against the second limiting steps of the limiting area where the material box is located.
9. The limiting device according to claim 8, characterized in that: The pressure sensor further includes a third pressure sensor and multiple groups of fourth pressure sensors, the third pressure sensors are arranged on the vertical line, and each group of the fourth pressure sensors are symmetrically arranged along the vertical line; Wherein, the material box is pressed on the third pressure sensor and simultaneously pressed on the fourth pressure sensor in the limiting area where the material box is located.
10. A testing device, characterized in that: include: The limiting device according to any one of claims 1 to 9.