Device for testing adhesive force of solar cell grid line

Abstract

The utility model relates to the technical field of solar cells, in particular to a solar cell grid line adhesive force testing device. The testing device comprises a fixed platform used for fixedly placing a test sample, and one side, provided with a grid line, of the test sample is placed upwards; the force measuring assembly comprises a testing head which is vertically arranged, the testing end of the testing head faces downwards, a driving mechanism which is in driving connection with the testing head so as to drive the testing head to move in the first transverse direction and a testing unit which is electrically connected with the testing head and used for measuring and recording resistance, and the first transverse direction is the direction perpendicular to the extending direction of the grid lines on the testing sample; the test head is located above the fixed platform, and the driving mechanism drives the test head to apply transverse thrust to the side part of the grid line of the test sample until the grid line falls off or is broken. The technical problems that an existing testing mode is greatly influenced by welding, the testing result cannot be guaranteed, the testing efficiency is low, the testing reliability is poor, and the auxiliary grid adhesive force cannot be tested are solved.

Description

Technical Field

[0001] This application relates to the technical field of solar cells, and particularly to a test device for the adhesion of grid lines of a solar cell. Background Art

[0002] Metal grid lines are provided on the surface of a solar cell. Generally, the metal grid lines mainly have two functions in the application of solar cells: 1. To conduct the charges accumulated at both ends of the PN junction of each solar cell; 2. To provide welding points for the series and parallel connection of solar cells; thus, it can be seen that the electrical conductivity and adhesion of the metal grid lines directly affect the electrical performance and reliability of the solar cell. Even if the adhesion of the metal grid lines is poor, the solar cell cannot be used.

[0003] In the prior art, the method for evaluating the adhesion of the metal grid lines on the surface of a solar cell is generally as follows: pads (abbreviation: PAD) are evenly distributed on the main grid, a solder tape (generally a tinned copper tape) is used to weld with the main grid and the pads, and then a tensiometer is used to perform a 180° reverse peel on the solder joints. During the process, the peak value of the tensile force of the solder joints on the pads is recorded, and then the adhesion value of the pads is analyzed to determine whether the adhesion of the metal grid lines meets the standard. However, this test method depends on the welding ability of the pads, and its tensile test results are greatly affected by welding. If the welding is not firm, the welding may break before the tensile test is completed, resulting in the interruption of the adhesion test of the main grid and the need to re-weld and re-test, so that the test efficiency of this test method cannot be guaranteed and the reliability is also poor. In addition, in the prior art, the adhesion of the secondary grid of a solar cell is generally rarely evaluated, and there is basically no dedicated evaluation equipment for the adhesion test of the secondary grid. Summary of the Utility Model

[0004] The purpose of this application is to provide a test device for the adhesion of grid lines of a solar cell, so as to solve the technical problems that the existing test method for the adhesion of grid lines of a solar cell is greatly affected by welding, the test results cannot be guaranteed, the test efficiency is low, the test reliability is poor, and the adhesion of the secondary grid cannot be tested.

[0005] A test device for the adhesion of grid lines of a solar cell provided by this application includes:

[0006] A fixed platform for fixedly placing a test sample, and the side of the test sample with grid lines is placed facing up; and

[0007] A force measuring assembly, including a test head vertically arranged with the test end facing downwards, a driving mechanism drivingly connected to the test head to drive the test head to move along a first transverse direction, and a test unit electrically connected to the test head for measuring and recording resistance, where the first transverse direction is a direction perpendicular to the extending direction of the grid lines on the test sample;

[0008] The test head is located above the fixed platform, and the driving mechanism drives the test head to apply a lateral thrust to the side of the gate line of the test sample until the gate line falls off or breaks.

[0009] Further, the test head is a needle-shaped test head or a scraping test head.

[0010] Further, the needle-shaped test head includes a cylindrical portion and a conical portion arranged in contact with each other. The conical portion is the test end, and the conical tip of the conical portion faces downward away from the cylindrical portion. The conical portion is used to contact the side of the gate line of the test sample, and the cylindrical portion is a connecting portion for connecting with the driving mechanism.

[0011] Further, the scraping test head is a flat cuboid plate-like structure with a length and height both greater than the width. The bottom surface where the length and width are located faces downward. The upper part of the scraping test head is the connecting portion, and the lower part is the test end.

[0012] Further, the test unit includes a dynamometer for measuring the magnitude of the resistance,

[0013] One end side of the dynamometer is fixedly installed or detachably installed with the test head, and the other end side of the dynamometer is connected to the driving mechanism.

[0014] Even further, the dynamometer is a spring-type dynamometer or a strain-type dynamometer.

[0015] Even further, the test unit further includes a data analysis terminal electrically connected to the dynamometer. The dynamometer transmits the measured resistance value to the data analysis terminal in real time, and the data analysis terminal generates a resistance analysis curve.

[0016] Further, the driving mechanism includes a lead screw extending along the first lateral direction and a first driving motor drivingly connected to one end of the lead screw. A rotating bearing is fixedly connected to one end face of the dynamometer facing the lead screw, and the other end of the lead screw is rotatably connected to the rotating bearing, so that the first driving motor controls the dynamometer to move back and forth along the first lateral direction by driving the lead screw; or

[0017] The driving mechanism includes a telescopic rod extending along the first lateral direction and a second driving motor drivingly connected to one end of the telescopic rod. The other end of the telescopic rod is fixedly connected to the dynamometer or the test head, so that the second driving motor drives the telescopic rod to expand and contract to control the dynamometer or the test head to move back and forth along the first lateral direction.

[0018] Further, one end face of the dynamometer connected to the test head is fixedly connected with an adjustable mounting sleeve and a tightening fixing member screwed and fixedly connected to the adjustable mounting sleeve. The shape and size of the sleeve opening of the adjustable mounting sleeve are set corresponding to the shape and size of the connecting portion of the test head, so that the longitudinal fixing position of the test head sleeved and fixedly connected in the adjustable mounting sleeve can be adjusted.

[0019] Further, a vacuum adsorption assembly is installed on the fixed platform. The vacuum adsorption assembly includes a vacuum adsorption table arranged on the fixed platform for fixing and placing the position area of the test sample and a vacuum pipeline connected to the lower part of the vacuum adsorption table.

[0020] Compared with the prior art, the test device for the adhesion of the solar cell grid lines provided by the present application includes a fixed platform for fixedly placing a test sample, and the test sample is a solar cell. When placing the test sample, the side with grid lines is placed facing up. It also includes a force measuring assembly. The force measuring assembly includes a vertically arranged test head, and the test end of the test head is arranged downward. The test head is located above the fixed platform and is used to directly contact the side of the grid lines of the test sample, and is driven by a driving mechanism connected to it to move along the first transverse direction. The first transverse direction is the direction perpendicular to the extending direction of the grid lines on the test sample, so as to apply a transverse thrust to the side of the grid lines on the test sample. The test unit electrically connected to the test head is used to measure and record the resistance on the side of the grid lines during the pushing process until the grid lines fall off or break, and a peak value is obtained, that is, the test result of the adhesion of the solar cell grid lines is obtained.

[0021] This setting method can be used not only for testing the adhesion of the main grid lines of solar cells, but also for testing the adhesion of the sub-grid lines of solar cells. Because this setting method of the present application is not limited by the thickness of the grid lines themselves, no matter how thin they are, this method can be used for testing and accurate and reliable test results can be obtained. Moreover, in this test device of the present application, the test head is directly controlled to act on the side of the grid lines with a thrust and continuously output until the grid lines fall off or break. The whole process does not need to rely on other indirect structures such as welding to complete, is not affected by other factors such as welding, the test result can be directly obtained and guaranteed, and the test result is reliable. At the same time, it is not necessary to repeat the test many times due to other factors such as poor welding. The test efficiency is high, and the waste of test samples is reduced. Description of the Drawings

[0022] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of the test device for the adhesion of the solar cell grid lines provided by the embodiment of the present application;

[0024] Figure 2 Schematic diagram of the usage state of the needle-shaped test head provided by the embodiment of the present application before testing;

[0025] Figure 3 Top view schematic diagram of the usage state of the needle-shaped test head provided by the embodiment of the present application before testing;

[0026] Figure 4 Schematic diagram of the usage state of the scraper-type test head provided by the embodiment of the present application before testing;

[0027] Figure 5 Top view schematic diagram of the usage state of the scraper-type test head provided by the embodiment of the present application before testing;

[0028] Figure 6 Structural schematic diagram of the scraper-type test head provided by the embodiment of the present application.

[0029] Reference numerals:

[0030] 10 - Needle-shaped test head;

[0031] 11 - Cylindrical part;

[0032] 12 - Conical part;

[0033] 121 - Conical tip;

[0034] 20 - Scraper-type test head;

[0035] 30 - Dynamometer;

[0036] 31 - Adjustable mounting sleeve;

[0037] 32 - Tightening fixing part;

[0038] 33 - Rotating bearing;

[0039] 41 - Lead screw;

[0040] 42 - First driving motor;

[0041] 43 - Fixed rod;

[0042] 50 - Fixed platform;

[0043] 51 - Vacuum adsorption table;

[0044] 52 - Vacuum pipeline;

[0045] 60 - Test sample;

[0046] 61 - Grid line. Detailed implementation manner

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application described and illustrated herein generally may be arranged and designed in a variety of different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0049] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0050] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0051] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0052] In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0053] The following will describe in detail some embodiments of the present application with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0054] As Figure 1 shown, the embodiment of the present application provides a test device for the adhesion of the grid lines of a solar cell. The test device includes a fixed platform 50, which is used to fixedly place a test sample 60. The test sample 60 can specifically be a solar cell. At least one side surface of the test sample 60 (such as a solar cell) is provided with grid lines 61. Generally, there are multiple grid lines 61, including main grid lines and sub-grid lines. When preparing for the test, the test sample 60 is placed and fixed on the fixed platform 50, and the surface of the test sample 60 where the grid lines 61 for which the adhesive force is to be tested are located faces upward.

[0055] The test device provided by the embodiment of the present application further includes a force measuring component. The force measuring component includes a vertically arranged test head, and the test end of the test head is arranged downward. It further includes a driving mechanism that is drivingly connected to the test head to drive the test head to move along a first lateral direction a, and a test unit that is electrically connected to the test head and is used to measure and record the resistance. The first lateral direction a is a direction perpendicular to the extending direction of the grid lines 61 on the test sample 60 (i.e., the solar cell); the test head is located above the fixed platform 50. The driving mechanism drives the test head to apply a lateral thrust to the side of the grid lines 61 of the test sample 60 until the grid lines 61 are peeled off or broken, and the test unit records the resistance value at this time, which is the maximum adhesive force of the grid lines 61.

[0056] Compared with the prior art, the test device for the adhesion of the grid lines of a solar cell provided by the embodiment of the present application includes a fixed platform 50 for fixedly placing a test sample 60, and the test sample 60 is a solar cell. When placing the test sample 60, the side with grid lines 61 is placed facing upwards. The test device further includes a force measuring component, which includes a test head vertically arranged with its test end facing downwards. The test head is located above the fixed platform 50 and is used to directly contact the side of the grid lines 61 of the test sample 60, and is driven by a driving mechanism connected to it to move along the first lateral direction a, where the first lateral direction a is a direction perpendicular to the extending direction of the grid lines 61 on the test sample 60, so as to apply a lateral thrust to the side of the grid lines 61 on the test sample 60. The test unit electrically connected to the test head is used to measure and record the resistance on the side of the grid lines 61 during the pushing process. Until the grid lines 61 fall off or break, a peak value is obtained, that is, the test result of the adhesion of the grid lines 61 of the solar cell is obtained.

[0057] This setting method can not only be used to test the adhesion of the main grid lines of a solar cell, but also can be used to test the adhesion of the sub-grid lines of a solar cell. Because this setting method provided by the embodiment of the present application is not limited by the thickness and size of the grid lines 61 themselves, no matter how thin they are, this method can be used for testing and accurate and reliable test results can be obtained. Moreover, the test device provided by the embodiment of the present application controls the test head to directly act on the side of the grid lines 61 with a thrust force and continuously outputs until the grid lines 61 fall off or break. The whole process does not need to rely on other indirect structures such as welding to complete, is not affected by other factors such as welding, the test result can be directly obtained and guaranteed, and the test result is reliable. At the same time, it is not necessary to repeat the test many times due to other factors such as poor welding, the test efficiency is high, and the waste of the test sample 60 is reduced.

[0058] As Figures 1 to 3 shown, for the aforementioned test head, a specific embodiment is that the test head can be a needle-shaped test head 10. The needle-shaped test head 10 can include a cylindrical part 11 and a conical part 12 arranged in contact with each other. The conical part 12 is the test end of the needle-shaped test head 10, and the cylindrical part 11 is the connecting part of the needle-shaped test head 10. The conical tip 121 of the conical part 12 faces downwards away from the cylindrical part 11. The conical part 12 is used to contact the side of the grid lines 61 of the test sample 60, and the cylindrical part 11 is used to connect to the driving mechanism or the force measuring instrument 30, and can be fixedly connected or detachably connected specifically. This kind of needle-shaped test head 10 is more sensitive and flexible to operate.

[0059] As Figures 4 to 6As shown, for the aforementioned test head, another specific embodiment is that the test head can specifically be a scraper-type test head 20. The scraper-type test head 20 can be a flat cuboid plate-like structure with a length and height both greater than the width. The bottom surface where its length and width are located is set downward. Specifically, the upper part of the scraper-type test head 20 is its connecting part, and the lower part is its test end. The resistance measured by this scraper-type test head 20 can be conveniently converted into the adhesion force per unit area and uniformity. Compared with the aforementioned needle-type test head 10, the contact area of the test end of the scraper-type test head 20 is larger, the force is more uniform, and the result of the measured adhesion force is more persuasive and reliable. Moreover, the flat structure is flexible to operate.

[0060] A preferred embodiment is that, as Figure 1 shown, the aforementioned test unit may include a dynamometer 30 for measuring the magnitude of resistance. One end side of the dynamometer 30 is fixedly installed or detachably installed with the aforementioned test head (needle-type test head 10 or scraper-type test head 20). The other end side of the dynamometer 30 is connected to the aforementioned driving mechanism. The test head is detachably installed, and different test heads can be installed according to needs to test the adhesion forces of grid lines 61 with different lengths, widths, and heights.

[0061] A specific embodiment is that the aforementioned dynamometer 30 can be a spring-type dynamometer or a strain-type dynamometer. These two types of dynamometers 30 are sensitive in response, high in precision, small in measurement error, and high in reliability.

[0062] A more preferred embodiment is that the aforementioned test unit may further include a data analysis terminal electrically connected to the aforementioned dynamometer 30. The dynamometer 30 can transmit the resistance value measured by it to the data analysis terminal in real time. The data analysis terminal can generate a real-time resistance analysis curve to clearly display the test results. For example, the peak value of the curve is the maximum adhesion force of the grid line 61.

[0063] As Figure 1As shown, in a specific embodiment, the aforementioned driving mechanism may specifically include a lead screw 41 extending along the first transverse direction a and a first driving motor 42 drivingly connected to one end of the lead screw 41. One end face of the aforementioned dynamometer 30 facing the lead screw 41 may be fixedly connected with a rotating bearing 33, and the other end of the lead screw 41 is rotatably connected to the rotating bearing 33 to convert rotational motion into linear motion, so that the first driving motor 42 controls the dynamometer 30 to move along the first transverse direction a by driving the lead screw 41 to rotate. Specifically, the first driving motor 42 can control the dynamometer 30 to move back and forth along the first transverse direction a by forward rotation and reverse rotation. Preferably, the rotation drive of the first driving motor 42 can be controlled and realized by a background control center. Using this lead screw 41 structure to achieve lateral movement control, the operation is simple and reliable. Further, the front section of the end of the lead screw 41 connected to the first driving motor 42 can be supported by a fixed rod 43 to improve the support stability of the lead screw 41 and the dynamometer 30 connected thereto, etc.

[0064] In another specific embodiment, the aforementioned driving mechanism may specifically include a telescopic rod extending along the first transverse direction a and a second driving motor drivingly connected to one end of the telescopic rod. The other end of the telescopic rod is fixedly connected to the end face of the dynamometer 30 or fixedly connected to the connecting portion of the test head, so that the second driving motor drives the telescopic rod to expand and contract to control the dynamometer 30 or the test head to move back and forth along the first transverse direction a. Using this telescopic rod structure to achieve lateral movement control, the operation is simple and reliable.

[0065] Specifically, both the aforementioned first driving motor 42 and the aforementioned second driving motor can control the dynamometer 30 to move back and forth along the first transverse direction a through forward rotation and reverse rotation driving modes. Preferably, the rotation drives of the first driving motor 42 and the second driving motor can be controlled and realized by a background control center.

[0066] In order to control the longitudinal movement of the test head, adjust the height of the test end of the test head, as well as the contact position and contact area size with the gate line 61, a preferred embodiment is, as Figure 1 shown, one end face of the aforementioned dynamometer 30 connected to the connecting portion of the test head may be fixedly connected with an adjustable mounting sleeve 31 and a tightening fixing member 32 tightly and fixedly connected to the adjustable mounting sleeve 31. The shape and size of the sleeve opening of the adjustable mounting sleeve 31 are set to match the shape and size of the connecting portion of the test head, so that the connecting portion of the test head can be sleeved through the adjustable mounting sleeve 31 to adjust the longitudinal fixing position of the test head sleeved and fixedly connected in the adjustable mounting sleeve 31. Specifically, the longitudinal fixing position of the connecting portion of the test head can be manually adjusted and tightened to adjust the longitudinal movement position of the test head.

[0067] To achieve the control of the vertical movement of the test head, on the one hand, it can ensure contact with the side of the gate line 61 at different heights, and on the other hand, it can adjust the different heights of the test end of the test head so that the test end is at an appropriate height. Specifically, the tip or bottom surface of the test end of the test head can contact the plane at the adjacent position of the gate line 61 on the test sample 60, or can be suspended above the plane with a spaced space therebetween, that is, the vertical height position of the test head can be adjusted to adjust the contact position and contact area size with the gate line 61, or when switching to the next gate line 61 for testing, the appropriate position can be adjusted longitudinally.

[0068] A more preferred embodiment is that the fixed platform 50 of the embodiment of the present application can be installed with a vacuum adsorption component. The vacuum adsorption component can include a vacuum adsorption table 51 provided on the fixed platform 50 for fixing the position area of the test sample 60, and a vacuum pipeline 52 connected to the lower part of the vacuum adsorption table 51. The vacuum adsorption and fixation method has stronger stability, fixation ability and shockproof ability, effectively preventing the situation that the test sample 60 is pushed due to excessive thrust during the test, ensuring the fixed placement state of the test sample 60 and the reliability of the test results.

[0069] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A test device for the adhesion of the grid lines of a solar cell, characterized in that, include: A fixed platform, used to fix and place the test sample, and the test sample is placed with the side provided with the grid line facing upwards; and A force measuring assembly, comprising a test head arranged vertically with a test end facing downward, a driving mechanism drivingly connected to the test head to drive the test head to move along a first transverse direction, and a test unit electrically connected to the test head for measuring and recording resistance, wherein the first transverse direction is a direction perpendicular to an extension direction of a grid line on a test sample; The test head is located above the fixed platform, and the driving mechanism drives the test head to apply a lateral thrust to the side of the grid line of the test sample until the grid line falls off or breaks.

2. The testing device according to claim 1, characterized in that: The test head is a needle-shaped test head or a scraper-type test head.

3. The testing device according to claim 2, characterized in that: The needle-shaped test head includes a cylindrical portion and a conical portion which are connected to each other, the conical portion is the test end, the conical tip of the conical portion is arranged downward away from the cylindrical portion, the conical portion is used to contact the side of the grid line of the test sample, and the cylindrical portion is a connecting portion used to connect with the driving mechanism.

4. The testing device according to claim 2, characterized in that: The scraper-type test head is a flat rectangular plate-shaped structure with a length and a height greater than a width, and the bottom surface where the length and the width are located is arranged downward, the upper part of the scraper-type test head is a connecting part, and the lower part is the test end.

5. The testing device according to any one of claims 1 to 4, characterized in that: The test unit includes a dynamometer for measuring the magnitude of resistance. The test head is fixedly or detachably mounted on one end of the dynamometer, and the other end of the dynamometer is connected to the driving mechanism.

6. The testing device according to claim 5, characterized in that: The dynamometer is a spring dynamometer or a strain dynamometer.

7. The testing device according to claim 5, characterized in that: The test unit also includes a data analysis terminal electrically connected to the dynamometer. The dynamometer transmits the resistance value measured by the dynamometer to the data analysis terminal in real time, and the data analysis terminal generates a resistance analysis curve.

8. The testing device according to claim 5, characterized in that: The driving mechanism comprises a screw extending along the first transverse direction and a first driving motor drivingly connected to one end of the screw, a rotating bearing is fixedly connected to one end face of the dynamometer facing the screw, and the other end of the screw is rotatably connected to the rotating bearing, so that the first driving motor controls the dynamometer to move forward and backward along the first transverse direction by driving the screw; or The driving mechanism includes a telescopic rod extending along the first lateral direction and a second driving motor drivingly connected to one end of the telescopic rod, and the other end of the telescopic rod is fixedly connected to the dynamometer or the test head, so that the second driving motor drives the telescopic rod to extend and retract to control the dynamometer or the test head to move forward and backward along the first lateral direction.

9. The testing device according to claim 5, characterized in that: One end surface of the dynamometer connected to the test head is fixedly connected with an adjustable mounting sleeve and a tightening fixing member tightly and fixedly connected to the adjustable mounting sleeve. The shape and size of the sleeve opening of the adjustable mounting sleeve are set corresponding to the shape and size of the connecting portion of the test head, so that the longitudinal fixing position of the test head sleeved and fixedly connected in the adjustable mounting sleeve can be adjusted.

10. The test device according to claim 1, wherein The fixed platform is provided with a vacuum adsorption assembly. The vacuum adsorption assembly includes a vacuum adsorption table arranged on the fixed platform for fixing and placing the position area of the test sample and a vacuum pipeline connected to the lower part of the vacuum adsorption table.

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