Anti-subfissure testing machine

Abstract

The utility model provides an anti-subfissure testing machine. The anti-subfissure testing machine comprises a carrying table used for carrying a tested battery piece; the lower smashing assembly and the test battery piece are located on the same side of the carrying table, the lower smashing assembly comprises at least one smashing piece and at least one lifting device, the lifting device is vertically arranged on the carrying table, the smashing piece is connected with the lifting device, and the lifting device drives the smashing piece to move in the direction perpendicular to the carrying table; and the hitting piece is configured to apply hitting force to the tested battery piece. According to the utility model, the problems of low efficiency and large error of the anti-subfissure test of the solar cell in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar cell testing equipment technical field, specifically, relate to a kind of anti-hidden crack testing machine. BACKGROUND

[0002] With the rapid progress of solar power generation technology, solar cells as efficient devices for converting sunlight into electrical energy play an important role in the field of new energy. However, solar cells may be subjected to external impact in practical application, leading to hidden crack phenomenon, affecting their electrical performance and service life. Therefore, evaluating the anti-hidden crack performance of solar cells is crucial to ensure their reliability. Traditional hidden crack testing methods, such as corner impact testing, usually require operators to manually impact solar cells, which not only is inefficient but also has human error. SUMMARY

[0003] The main purpose of the utility model is to provide an anti-hidden crack testing machine to solve the problem of low efficiency and large error in the prior art.

[0004] To achieve the above purpose, according to one aspect of the utility model, an anti-hidden crack testing machine is provided, comprising:

[0005] A carrier, the carrier is used to carry test cells;

[0006] A lower impact assembly, the lower impact assembly is located on the same side of the test cells on the carrier, the lower impact assembly comprises at least one impact piece and at least one lifting device, the lifting device is vertically placed on the carrier, the impact piece is connected with the lifting device, and the lifting device drives the impact piece to move in a direction perpendicular to the carrier, the impact piece is configured to apply impact force to the test cells.

[0007] Further, each impact piece has at least one impact area on the side surface facing the carrier, each impact area has a plurality of impact protrusions arranged at intervals, and the protrusion heights of the plurality of impact protrusions are the same.

[0008] Further, the end of the impact protrusion away from the carrier is arc-shaped.

[0009] Further, the carrier has at least one carrying area for carrying test cells, and when there are multiple carrying areas, each carrying area corresponds to each impact area.

[0010] Further, the anti-hidden crack testing machine further comprises a current testing assembly, the current testing assembly is located on the same side of the impact piece on the carrier, the current testing assembly and the impact piece are switchably located in the opposite position of the test cells, and the current testing assembly is configured to test the current of the test cells.

[0011] Further, the carrier includes: a carrier body, the lifting device is connected with the carrier body, the carrier body has a first test area and a second test area, a normal projection of the hammering piece on the carrier body covers the first test area, and a normal projection of the current test assembly on the carrier body covers the second test area; and a carrier plate, the carrier plate is configured to carry a test battery piece, and the carrier plate is switchably arranged in the first test area and the second test area.

[0012] Further, the carrier body has at least one track, two ends of the track are located in the first test area and the second test area respectively, and a surface of the carrier plate on a side of the carrier body has a sliding part matched with the track, so that the carrier plate is switched in the first test area and the second test area.

[0013] Further, the carrier plate includes: a plate body, the plate body is movably connected with the carrier body; and a buffer pad, the buffer pad is arranged on a surface of the plate body away from the carrier body, and the buffer pad is used for carrying the test battery piece.

[0014] Further, the lifting device has at least one first magnetic part, the hammering piece has a second magnetic part matched with the first magnetic part, the first magnetic part is located on a side of the second magnetic part away from the carrier, and at least one of the first magnetic part or the second magnetic part is an electromagnetic part.

[0015] Further, the lifting device includes: a guide plate, the guide plate is vertically arranged on the carrier, the hammering piece is slidably connected with the guide plate, and the hammering piece moves along an extension direction of the guide plate; and a driving assembly, the driving assembly is located on a side of the guide plate away from the test battery piece, the first magnetic part is connected with the driving assembly, the first magnetic part is an electromagnetic part, the driving assembly is used for providing current for the first magnetic part, and the second magnetic part is located directly below the first magnetic part.

[0016] According to the technical scheme of the utility model, the anti-cracking testing machine includes a carrier and a lower hammering assembly, the carrier is used for carrying a test battery piece, the lower hammering assembly is located on the same side of the test battery piece on the carrier, the lower hammering assembly includes at least one hammering piece and at least one lifting device, the lifting device is vertically arranged on the carrier, the hammering piece is connected with the lifting device, and the lifting device drives the hammering piece to move in a direction perpendicular to the carrier, and the hammering piece is configured to exert a hammering force on the test battery piece.

[0017] During the testing of the test cells, the test cells are placed on a platform to ensure uniform stress distribution and reduce the influence of other factors on the microcrack test. A lifting device drives the impactor to move perpendicular to the platform, allowing it to move away from the platform and expose the bearing area of ​​the test cell for easy placement and removal. Furthermore, the impactor can strike the test cell either by the lifting device or by allowing it to fall freely from a preset height, observing the microcracks after impact. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of an optional embodiment of the microcrack resistance testing machine of this utility model is shown;

[0020] Figure 2 It shows Figure 1 A schematic diagram of the structure of a microcrack resistance testing machine at one angle;

[0021] Figure 3 It shows Figure 1 Another structural diagram of the microcrack resistance testing machine;

[0022] Figure 4 It shows Figure 3 Schematic diagram showing the positional relationship between the intermediate stage, the impact assembly, and the current testing assembly;

[0023] Figure 5 It shows Figure 4 A schematic diagram showing the positional relationship between the current testing component and the carrier plate when the carrier plate is located in the second test area;

[0024] Figure 6 It shows Figure 4 A schematic diagram showing the positional relationship between the impactor and the load-bearing plate when the load-bearing plate is located in the first test area;

[0025] Figure 7 It shows Figure 6 A diagram showing the state of the test cell when the bearing plate is located in the first test area and the impactor strikes the test cell.

[0026] Figure 8 It shows Figure 3 A structural schematic diagram of the intermediate stage at one angle;

[0027] Figure 9 It showsFigure 3 Structural schematic view of one angle of the lower impact assembly;

[0028] Figure 10 The lower impact assembly is shown Figure 3 Structural schematic view of another angle of the lower impact assembly.

[0029] Wherein, the above-mentioned drawings include the following reference signs:

[0030] 10, platform; 11, bearing area; 12, platform body; 121, first test area; 122, second test area; 123, track; 13, bearing plate; 131, plate body; 132, buffer pad; 20, lower impact assembly; 30, impact piece; 31, impact area; 32, impact protrusion; 33, second magnetic piece; 40, lifting device; 41, first magnetic piece; 42, guide plate; 43, driving assembly; 44, limiting plate; 50, test battery piece; 60, current test assembly; 70, shell; 71, first shell segment; 72, second shell segment; 80, display screen. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0033] In the present application, unless otherwise specified, the orientation words such as "upper, lower, top, bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves. Similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0034] In order to solve the problem of low efficiency and large error of solar cell anti-crack test in the prior art, the present application provides an anti-crack testing machine.

[0035] As Figures 1 to 10As shown, the anti-hidden crack testing machine includes a carrier 10 for carrying a test cell piece 50 and a drop assembly 20 located on the same side of the carrier 10 as the test cell piece 50, the drop assembly 20 including at least one drop piece 30 and at least one lifting device 40 standing on the carrier 10, the drop piece 30 being connected with the lifting device 40 and the lifting device 40 driving the drop piece 30 to move in a direction perpendicular to the carrier 10, the drop piece 30 being configured to apply a drop force to the test cell piece 50.

[0036] When testing the test cell piece 50, the test cell piece 50 is placed on the carrier 10 to ensure that the test cell piece 50 is uniformly stressed everywhere, reducing the influence of other factors on the anti-hidden crack test. The lifting device 40 is used to drive the drop piece 30 to move in a direction perpendicular to the carrier 10, so as to drive the drop piece 30 to move away from the carrier 10 to expose the carrying area 11 carrying the test cell piece 50, facilitating the taking and placing of the test cell piece. In addition, when the drop piece 30 strikes the test cell piece 50, the lifting device 40 can drive the drop piece 30 to strike the test cell piece 50, or the drop piece 30 can freely fall at a predetermined height to strike the test cell piece 50, and the hidden crack condition of the test cell piece 50 after being struck is observed.

[0037] When the lifting device 40 drives the drop piece 30 to strike the test cell piece 50, the driving force of the lifting device 40 driving the drop piece 30 can be adjusted according to actual conditions; when the drop piece 30 freely falls at a predetermined height to strike the test cell piece 50, the predetermined height can also be adjusted according to actual needs, which is not limited here.

[0038] It should be noted that when the drop piece 30 freely falls at a predetermined height to strike the test cell piece 50, the lifting device 40 is used to lift the drop piece 30 to the predetermined height to reduce the error of human operation and improve the accuracy of the test.

[0039] The anti-hidden crack testing machine of the utility model can effectively simulate the external force impact that the battery piece may suffer during transportation, assembly or use, thereby accurately evaluating the anti-hidden crack performance of the battery piece, which has important significance for improving the production quality and reliability of solar cell pieces. The application scenarios of the anti-hidden crack testing machine of the utility model include factory detection, quality control of solar cell pieces and performance evaluation of new materials or new processes.

[0040] As Figure 9As shown, each of the beating members 30 has at least one beating area 31 on the side surface facing the carrier 10, and each of the beating areas 31 has a plurality of beating protrusions 32 arranged at intervals, and the plurality of beating protrusions 32 have the same protrusion height. When the beating member 30 beats the test battery piece 50, the beating area 31 corresponds to the test battery piece 50, so that the beating protrusions 32 beat the test battery piece 50. Different beating protrusions 32 beat different areas of the test battery piece 50 to test different positions of the test battery piece 50, thereby ensuring that the test battery piece 50 is uniformly stressed during testing, and avoiding non-real hidden cracks caused by excessive local stress. In addition, the plurality of beating protrusions 32 have the same protrusion height, so that when the beating member 30 beats the test battery piece 50, the plurality of beating protrusions 32 beat the test battery piece 50 at the same time, avoiding non-real hidden cracks caused by excessive stress concentration in the local stress of the test battery piece 50, thereby improving the accuracy and reliability of the test results.

[0041] As shown in Figure 9 The end of the beating protrusion 32 away from the carrier 10 is arc-shaped. The arc-shaped design can reduce the stress concentration when the beating protrusion 32 contacts the test battery piece 50, and avoid non-real hidden cracks caused by excessive stress concentration in the local stress of the test battery piece 50, thereby improving the accuracy and reliability of the test results.

[0042] As shown in Figure 8 The carrier 10 has at least one bearing area 11 for bearing the test battery piece 50, and when there are a plurality of bearing areas 11, each bearing area 11 corresponds to each beating area 31. When the carrier 10 has a plurality of bearing areas 11, one test battery piece 50 can be placed in each bearing area 11, and each beating area 31 beats the test battery piece 50 in the corresponding bearing area 11 to simultaneously perform the hidden crack resistance test on a plurality of test battery pieces 50, thereby effectively improving the test efficiency, and being suitable for quality control in large-scale production environment. In addition, the hidden crack resistance test machine can simultaneously perform comparative tests on battery pieces from different manufacturers, thereby reducing the influence of other factors and improving the accuracy of comparison.

[0043] As shown in Figures 1 to 7 The hidden crack resistance test machine further comprises a current test assembly 60, and the current test assembly 60 and the beating member 30 are located on the same side of the carrier 10. The current test assembly 60 and the beating member 30 are switchably located in the opposite position of the test battery piece 50, and the current test assembly 60 is configured to test the current of the test battery piece 50. The addition of the current test assembly 60 can measure the current comparison of the test battery piece 50 before and after beating, and evaluate the hidden crack degree of the test battery piece 50 according to the current data before and after beating.

[0044] It should be noted that the current test assembly 60 can only display the current size of each measurement, relying on manual calculation of the current loss after being hit to evaluate the anti-crack performance of the battery piece. The control module can also be set in the current test assembly 60, and the current test assembly 60 automatically calculates the current of the hit battery piece after being hit compared with the current before being hit, calculates the current loss after being hit, and evaluates the anti-crack performance of the battery piece.

[0045] The current test assembly 60 includes a lamp plate assembly for irradiating the test battery piece 50 to provide current for the test battery piece 50. In addition, the current test assembly 60 can also include a data analysis module for comparing the current data before and after being hit, and evaluating the crack degree of the test battery piece 50. The data analysis module can automatically identify and evaluate the crack degree, reduce the subjectivity and error of manual judgment, and is suitable for high-precision test requirements.

[0046] It should be noted that when the carrier table 10 has a plurality of bearing areas 11, the carrier table 10 can be an integrated structure having a plurality of bearing areas 11, or the carrier table 10 can include a plurality of independent carrier plates, each of which has at least one bearing area 11. The number of bearing areas 11 on the carrier plate is not specifically limited and can be designed according to actual needs. When the down-hitting assembly 20 has a plurality of hitting areas 31, the down-hitting assembly 20 can have only one hitting piece 30, which has a plurality of hitting areas 31, or the down-hitting assembly 20 can have a plurality of hitting pieces 30, each of which has at least one hitting area 31. The plurality of hitting pieces 30 have a plurality of hitting areas 31, wherein the number of hitting pieces 30 and the number of hitting areas 31 can be the same or different, which is not specifically limited here. When the down-hitting assembly 20 has a plurality of hitting pieces 30, the number of lifting devices 40 in the down-hitting assembly 20 is not specifically limited and can be one or more, which is not specifically limited here. It is only necessary to ensure that the number of bearing areas 11 is the same as the number of hitting areas 31, and they are one-to-one corresponding.

[0047] As Figures 4 to 7As shown, the platform 10 includes a platform body 12 and a support plate 13. A lifting device 40 is connected to the platform body 12. The platform body 12 has a first test area 121 and a second test area 122. The orthographic projection of the impactor 30 on the platform body 12 covers the first test area 121, and the orthographic projection of the current testing component 60 on the platform 10 covers the second test area 122. The support plate 13 is configured to support the test battery cell 50 and can be switched between the first test area 121 and the second test area 122. This partitioned design allows for separate impact testing and current testing, ensuring both testing accuracy and operational flexibility. The support plate 13 facilitates switching the test battery cell 50 between the first test area 121 and the second test area 122. Furthermore, placing the test battery cell 50 on the support plate 13 during each test reduces positional deviation, ensuring that the impactor 30 accurately strikes the test battery cell 50. In addition, the orthographic projection of the impactor 30 on the platform body 12 covers the first test area 121, so that the impactor 30 can accurately impact the test battery cell.

[0048] It should be noted that the aforementioned bearing area 11 includes at least the first test area 121.

[0049] like Figures 4 to 8 As shown, the platform body 12 has at least one track 123, with both ends of the track 123 located within the first test area 121 and the second test area 122, respectively. The surface of the support plate 13 facing the platform body 12 has a sliding member that cooperates with the track 123, allowing the support plate 13 to switch between the first test area 121 and the second test area 122. This cooperation between the track 123 and the sliding member enables the support plate 13 to switch quickly and accurately between the first test area 121 and the second test area 122, avoiding deviations caused by testing the battery cell 50 at different positions and improving test accuracy.

[0050] like Figure 4 As shown, the support plate 13 includes a plate body 131 and a buffer pad 132. The plate body 131 is movably connected to the platform body 12. The buffer pad 132 is disposed on the surface of the plate body 131 away from the platform body 12, and is used to support the test cell 50. The buffer pad 132 effectively reduces the direct contact between the test cell 50 and the hard surface during the test, avoiding additional damage caused by contact, protecting the integrity of the test cell 50, and improving the validity of the test results. In addition, the buffer pad 132 provides more uniform support for the test cell 50, reducing stress concentration during the test and improving the accuracy of the test.

[0051] exist Figure 10In the specific embodiment shown, the lifting device 40 has at least one first magnetic member 41, the hitting member 30 has a second magnetic member 33 matched with the first magnetic member 41, the first magnetic member 41 is located on the side of the second magnetic member 33 away from the carrier 10, and at least one of the first magnetic member 41 or the second magnetic member 33 is an electromagnetic member. At least one of the first magnetic member 41 and the second magnetic member 33 is an electromagnetic member, so that the first magnetic member 41 and the second magnetic member 33 are attracted to each other when energized, and the two move towards each other, and the second magnetic member 33 moves downward under the action of gravity when not energized, thereby causing the hitting member 30 to hit the test battery piece 50.

[0052] Of course, the lifting device 40 can drive the hitting member 30 to ascend in many other ways, which are not specifically limited here, as long as the lifting device 40 can drive the hitting member 30 to ascend when the hitting member 30 ascends. When the hitting member 30 descends, it can rely on the lifting device 40 to drive the hitting member 30 to hit the test battery piece 50, or it can rely on its own gravity to drop downward onto the test battery piece 50.

[0053] As shown in Figure 4 The lifting device 40 includes a guide plate 42 and a driving assembly 43. The guide plate 42 is vertically arranged on the carrier 10, the hitting member 30 is slidingly connected with the guide plate 42, and the hitting member 30 moves along the extension direction of the guide plate 42. The driving assembly 43 is located on the side of the guide plate 42 away from the test battery piece 50. The first magnetic member 41 is connected with the driving assembly 43, the first magnetic member 41 is an electromagnetic member, the driving assembly 43 is used for providing current for the first magnetic member 41, and the second magnetic member 33 is located directly below the first magnetic member 41. The hitting member 30 moves along the extension direction of the guide plate 42 during movement to ensure the stability of the movement of the hitting member 30. The hitting member 30 moves upward by magnetic attraction and moves downward by gravity to simulate the hitting of battery pieces by raindrops and hailstones.

[0054] In Figure 4 the specific embodiment shown, the lifting device 40 further includes a limiting plate 44, the limiting plate 44 is connected with the guide plate 42, and at least a part of the limiting plate 44 is located on the side of the guide plate 42 away from the driving assembly 43 to limit the hitting member 30, so as to ensure the stability of the movement of the hitting member 30.

[0055] In some optional embodiments, please refer to Figures 1 to 3The anti-crack testing machine further comprises a housing 70, the housing 70 is in an L-shaped structure, a first housing segment 71 of the housing 70 is vertically arranged on the support table 10, and a second housing segment 72 of the housing 70 extends outward from a side of the first housing segment 71 away from the support table 10, a testing space is formed between the second housing segment 72 and the support table 10, a part of the lifting device 40 is located in the housing 70, and the lamp plate assembly of the current testing assembly 60 is exposed on a side of the second housing segment 72 facing the support table 10.

[0056] In some optional embodiments, referring to Figures 1 to 3 The anti-crack testing machine further comprises a display screen 80, the display screen 80 is arranged on a side of the second housing segment 72 away from the first housing segment 71, the display screen 80 is connected with the control module, the control module is electrically connected with the support table 10, the lower pressing assembly 20 and the current testing assembly 60, and the display screen 80 can be used to perform testing operation on the battery.

[0057] It should be noted that the above-mentioned test battery piece 50 can be a finished battery piece or a semi-finished battery piece. For example, it can be a battery without connecting bus bars or a battery with connecting bus bars, and can be designed according to specific use requirements.

[0058] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0059] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0060] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0061] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A crack resistance testing machine characterized by, The application relates to an anti-crack testing machine. The anti-crack testing machine comprises: a carrier (10) for carrying a test battery piece (50); 2. The crack resistance testing machine according to claim 1, characterized by a lower hammering assembly (20) located on the same side of the carrier (10) as the test battery piece (50), the lower hammering assembly (20) comprising at least one hammering piece (30) and at least one lifting device (40), the lifting device (40) being vertically arranged on the carrier (10), the hammering piece (30) being connected with the lifting device (40), and the lifting device (40) driving the hammering piece (30) to move in a direction perpendicular to the carrier (10), the hammering piece (30) being configured to apply a hammering force to the test battery piece (50).

3. The crack resistance testing machine according to claim 2, characterized in that, Each of the hammering pieces (30) has at least one hammering area (31) on a side surface of the carrier (10), and each of the hammering areas (31) has a plurality of spaced hammering protrusions (32) arranged therein, the protrusions of the plurality of hammering protrusions (32) having the same protrusion height.

4. The crack resistance testing machine according to claim 2, wherein An end of the hammering protrusion (32) away from the carrier (10) is arc-shaped.

5. The anti-cracking testing machine according to any one of claims 1 to 4, characterized in that, The carrier (10) has at least one carrying area (11) for carrying the test battery piece (50), and when the carrier (10) has a plurality of carrying areas (11), each of the carrying areas (11) corresponds to each of the hammering areas (31) one by one.

6. The crack resistance testing machine according to claim 5, wherein The anti-crack testing machine further comprises a current testing assembly (60) located on the same side of the carrier (10) as the hammering piece (30), the current testing assembly (60) being switchably located opposite the test battery piece (50) from the hammering piece (30), and the current testing assembly (60) being configured to test the current of the test battery piece (50). The carrier (10) comprises: a carrier body (12), the lifting device (40) being connected with the carrier body (12), the carrier body (12) having a first testing area (121) and a second testing area (122), the hammering piece (30) having a right projection on the carrier body (12) covering the first testing area (121), and the current testing assembly (60) having a right projection on the carrier (10) covering the second testing area (122); 7. The crack resistance testing machine according to claim 6, characterized in that, a carrying plate (13) configured to carry the test battery piece (50), the carrying plate (13) being switchably arranged in the first testing area (121) and the second testing area (122).

8. The crack resistance testing machine according to claim 6, wherein The carrier body (12) has at least one track (123) with two ends located in the first testing area (121) and the second testing area (122) respectively, and a surface of the carrying plate (13) towards the carrier body (12) has a sliding member matched with the track (123) so that the carrying plate (13) is switched in the first testing area (121) and the second testing area (122). The carrying plate (13) comprises: A plate body (131) movably connected with the stage body (12); A buffer pad (132) arranged on a side surface of the plate body (131) away from the stage body (12), the buffer pad (132) being used for carrying the test battery piece (50).

9. The anti-cracking testing machine according to any one of claims 1 to 4, characterized in that, The lifting device (40) has at least one first magnetic member (41), the hammering member (30) has a second magnetic member (33) matched with the first magnetic member (41), the first magnetic member (41) is located on a side of the second magnetic member (33) away from the stage (10), and at least one of the first magnetic member (41) or the second magnetic member (33) is an electromagnetic member.

10. The crack resistance testing machine according to claim 9, characterized in that, The lifting device (40) comprises: A guide plate (42) standing on the stage (10), the hammering member (30) being slidably connected with the guide plate (42) and moving along an extension direction of the guide plate (42); A driving assembly (43) located on a side of the guide plate (42) away from the test battery piece (50), the first magnetic member (41) being connected with the driving assembly (43), the first magnetic member (41) being an electromagnetic member, the driving assembly (43) being used for providing current for the first magnetic member (41), and the second magnetic member (33) being located directly below the first magnetic member (41).

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