Carrier plate tool device

Abstract

The utility model belongs to the technical field of solar photovoltaic cell coating equipment, and particularly relates to a carrier plate tooling device, which comprises a tooling support formed by four edge supports in a surrounding mode. Four internal supports are arranged on the inner ring of the tool support in a surrounding mode, and the upper surface of each internal support is lower than the upper edge of the edge support so that a step-shaped structure can be formed to serve as an erecting position of the rectangular carrier plate frame. A plurality of limiting grooves are formed in the surfaces of the limiting ribs, and the two ends of each limiting rib are assembled on the transversely-arranged erecting positions correspondingly; ribs of the carrier plate frame are embedded in the limiting grooves of the limiting ribs, and the two ends of each rib are located in the longitudinally-arranged erecting positions respectively. And a plurality of limiting pieces are further symmetrically arranged on the edge support, and the limiting pieces are suitable for limiting the carrier plate frame.

Description

Technical Field

[0001] This utility model belongs to the technical field of solar photovoltaic cell coating equipment, and in particular relates to a carrier plate tooling device. Background Technology

[0002] With the increasing global demand for renewable energy, the solar photovoltaic industry has developed rapidly. In the manufacturing process of solar cells, silicon wafers need to undergo processes such as cleaning, diffusion, annealing, coating, and screen printing. PECVD (Plasma Enhanced Chemical Vapor Deposition) is one of the commonly used coating methods in solar cell production, consisting of a loading chamber, a preheating chamber, a process chamber, a discharge chamber, and a carrier plate return device. Each chamber is equipped with roller drives, and the carrier plate carries the silicon wafer, rotating between chambers under the action of the roller drives to complete the coating process.

[0003] The carrier plate is usually composed of a tray and a frame. The frame is fixed together by multiple ribs or vertical ribs to form a rectangular shape and can support the tray for coating process. During the frame tooling process, due to external factors such as uneven ground and different torque of nuts and screws, it is impossible to guarantee the straightness, flatness and other geometric tolerances of the frame. This will cause errors when installing the tray and thus affect the uniformity of coating.

[0004] Therefore, how to solve the problem of dimensional and positional tolerances in the ribs of the carrier frame caused by uneven installation plane is a technical problem that urgently needs to be solved by those skilled in the art.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0006] This disclosure provides at least one carrier plate tooling device.

[0007] In a first aspect, embodiments of this disclosure provide a carrier plate tooling apparatus, including:

[0008] A tooling support frame formed by four edge supports;

[0009] The tooling bracket has four internal brackets around its inner ring, and the upper surface of each internal bracket is lower than the upper edge of the edge bracket to form a stepped structure as the mounting position for the rectangular carrier frame.

[0010] Several limiting ribs, each having several limiting grooves on its surface, and both ends of which are respectively assembled on the horizontally arranged mounting positions;

[0011] The limiting groove of the limiting rib is embedded with the rib of the carrier plate frame, and the two ends of the rib are respectively located at the longitudinally arranged erection positions; and,

[0012] The edge support is also symmetrically provided with several limiting members, which are suitable for limiting the carrier plate frame.

[0013] In one optional embodiment, the limiting member includes:

[0014] A limiting plate is provided with sliders at both ends, and the sliders are slidably disposed in the grooves on the edge bracket;

[0015] The cylinder has a piston rod connected to a limiting plate, a cylinder body connected to an edge bracket, and a limit handle controlling the air circuit switch.

[0016] The limit handle controls the cylinder via an air circuit switch to push the limit plate toward the carrier frame, so that the symmetrically arranged limit plates clamp the carrier frame.

[0017] In one alternative embodiment, a first fixing device is provided at the connection of adjacent edge supports. The first fixing device includes a first washer, a first bolt and a first nut. The first washer includes a pair of mutually perpendicular reinforcing ribs to form an L-shaped support structure.

[0018] The first bolt passes through the reinforcing ribs of the edge bracket and the first washer in sequence and is locked by the first nut to fix the first washer to the adjacent edge bracket.

[0019] In one alternative embodiment, a connecting protrusion is provided in the middle of the first gasket, and the first bolt and the first nut are symmetrically arranged on both sides of the connecting protrusion.

[0020] In one alternative embodiment, the carrier frame further includes a plurality of vertical ribs, which are perpendicular to the reinforcing bars and connected by a second fixing device.

[0021] In one alternative embodiment, the second fixing device includes a second washer, a second bolt, and a second nut. The second washer is L-shaped and located at the connection between the rib and the vertical rib. The second bolt passes through the second washer and locks the rib and the vertical rib to the second washer by the second nut.

[0022] In one optional embodiment, the rib is provided with a plurality of tray hangers, and the spacing between adjacent tray hangers is equal.

[0023] In one optional embodiment, the bottom surface of the limiting rib is provided with a plurality of support blocks.

[0024] Secondly, embodiments of this disclosure also provide a carrier plate tooling device, comprising:

[0025] The tooling bracket includes a closed area enclosed by multiple edge brackets and internal brackets. A stepped structure composed of edge brackets and internal brackets is provided within the closed area for adapting to the installation of the carrier plate frame.

[0026] Several limiting ribs are provided on the tooling bracket. Each limiting rib is provided with at least one set of limiting grooves that cooperate with the ribs of the carrier plate frame. The size of the limiting grooves is adapted to the thickness of the ribs to constrain the installation plane of the ribs.

[0027] Several limiting components are symmetrically distributed on the tooling bracket to limit the displacement of the carrier plate frame.

[0028] In one optional embodiment, the limiting member includes:

[0029] A limiting plate is provided with sliders at both ends, and the sliders are slidably disposed in the grooves on the edge bracket;

[0030] The cylinder has a piston rod connected to a limiting plate, a cylinder body connected to an edge bracket, and a limit handle controlling the air circuit switch.

[0031] The limit handle controls the cylinder via an air circuit switch to push the limit plate toward the carrier frame, so that the symmetrically arranged limit plates clamp the carrier frame.

[0032] The beneficial effects of this utility model are as follows: This carrier plate tooling device forms a stepped structure through edge supports and internal supports of different heights. The edge supports and internal supports are connected end to end to form a carrier plate frame installation station. Limiting ribs are provided in the installation station, and limiting grooves matching the ribs of the carrier plate frame are opened on the limiting ribs. When the carrier plate frame is installed, the ribs are suitable for embedding into the limiting grooves, thereby ensuring that the ribs of the carrier plate frame are on the same installation plane. In addition, several limiting members are also provided on the edge supports. The limiting members are suitable for limiting the carrier plate frame and preventing it from shaking. Through the vertical constraint of the ribs by the limiting grooves and the horizontal clamping of the carrier plate frame by the limiting members, the ribs of the carrier plate frame are on the same installation plane and are not easy to shake during installation, thereby avoiding dimensional and positional tolerances during the installation of the carrier plate frame.

[0033] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and drawings.

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 A perspective view of a carrier plate tooling device provided in an embodiment of this disclosure;

[0037] Figure 2 A perspective view of a limiting rib of a carrier plate tooling device provided in an embodiment of this disclosure;

[0038] Figure 3 A top view of a carrier plate tooling device provided in an embodiment of this disclosure;

[0039] Figure 4 A perspective view of part A of a carrier plate tooling device provided in an embodiment of this disclosure;

[0040] Figure 5 A perspective view of part B of a carrier plate tooling device provided in an embodiment of this disclosure;

[0041] Figure 6 This is a perspective view of part C of a carrier plate tooling device provided in an embodiment of this disclosure.

[0042] In the picture:

[0043] 100. Tooling bracket; 110. Edge bracket; 111. Slide groove; 120. Internal bracket; 200. Limiting rib; 210. Limiting groove; 220. Support block; 300. Limiting component; 310. Limiting plate; 311. Slider; 320. Cylinder; 330. Limiting handle; 400. First fixing device; 410. First washer; 420. First nut; 430. First bolt; 440. Connecting protrusion; 500. Carrier plate frame; 510. Rib; 511. Pallet hanger; 520. Vertical rib; 600. Second fixing device; 610. Second washer; 620. Second nut; 630. Second bolt. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0046] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0047] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0048] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0049] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0050] Research has revealed the following drawbacks of existing technologies: during the frame tooling process, external factors such as uneven ground or different torques of nuts and screws may cause errors in the straightness, flatness, and other geometric tolerances of the frame, resulting in inaccuracies when installing the pallet and thus affecting the uniformity of the coating.

[0051] Based on the above research, this disclosure provides a carrier plate tooling device, which limits the carrier plate frame by setting limiting ribs and limiting members, so that the ribs of the carrier plate frame are on the same mounting plane, thus solving the above problems.

[0052] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0053] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0054] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0055] See Figure 1 This disclosure provides a carrier plate tooling device, including: a tooling bracket 100 surrounded by four edge brackets; the inner circle of the tooling bracket 100 is provided with four internal brackets 120, and the upper surface of each internal bracket 120 is lower than the upper edge of the edge bracket 100, so as to form a stepped structure as the mounting position of the rectangular carrier plate frame 500.

[0056] See also Figure 1The carrier frame 500 includes several ribs 510 and vertical ribs 520. The two ends of the ribs 510 and vertical ribs 520 respectively abut against the end faces of two stepped structures opposite to the installation position, so that the carrier frame 500 is engaged in the installation position of the carrier frame 500.

[0057] See also Figure 1 and Figure 3 The installation station is equipped with several limiting ribs 200, both ends of which are respectively assembled on the horizontally arranged support positions, and both ends of the ribs 510 are respectively located on the longitudinally arranged support positions.

[0058] Furthermore, the limiting rib 200 is provided with several limiting grooves 210, the width of which is adapted to the thickness of the ribs 510 of the carrier frame 500. The ribs 510 are embedded in the limiting grooves 210 so that the ribs 510 of the carrier frame 500 are on the same mounting plane. In addition, several limiting members 300 are symmetrically arranged on the edge bracket 110. The limiting members 300 are suitable for limiting the carrier frame 500 and preventing it from shaking. Through the cooperation of the limiting grooves 210 and the limiting members 300, the ribs 510 of the carrier frame 500 are on the same mounting plane and are not prone to shaking during installation, thereby avoiding dimensional and positional tolerances during the installation of the carrier frame 500.

[0059] See Figure 4 In some embodiments, the limiting member 300 includes: a limiting plate 310 with sliders 311 at both ends, the sliders 311 being slidably disposed within grooves 111 on the edge bracket 110; and a cylinder 320, the piston rod of which is connected to the limiting plate 310, the cylinder body of which is connected to the edge bracket 110, and a pneumatic switch controlled by a limiting handle 330. The limiting handle 330 controls the cylinder 320 via the pneumatic switch to push the limiting plate 310 toward the carrier frame 500. By simultaneously pressing the limiting handles 330 on both sides of the edge bracket 110, the limiting plates 310 on both sides of the edge bracket 110 move toward each other, clamping the carrier frame 500 and preventing it from shaking during installation.

[0060] See Figure 5 In some embodiments, a first fixing device 400 is provided at the connection of adjacent edge supports 110. The first fixing device 400 includes a first washer 410, a first bolt 430, and a first nut 420. The first washer 410 includes a pair of mutually perpendicular reinforcing ribs, forming an L-shaped support structure. The first bolt 430 passes through the reinforcing ribs of the edge support 110 and the first washer 410 in sequence and is locked by the first nut 420 to fix the first washer 410 to the adjacent edge support 110. With the reinforcement of the first fixing device 400, the edge support 110 is less prone to deformation under stress when the carrier frame 500 is installed, further improving the stability of the carrier tooling.

[0061] See also Figure 5 In some embodiments, a connecting protrusion 440 is provided in the middle of the first washer 410, and the first bolt 430 and the first nut 420 are symmetrically arranged on both sides of the connecting protrusion 440. This symmetrical arrangement of the first bolt 430 and the first nut 420 allows pressure to be transmitted to both sides through the connecting protrusion 440 when the edge bracket 110 is under pressure, preventing bolt preload loosening or thread wear due to uneven force distribution. Simultaneously, the connecting protrusion 440 can disperse localized stress during bolt tightening, improving the dimensional and positional tolerance accuracy of the edge bracket 110.

[0062] See also Figure 1 In some embodiments, the vertical rib 520 is perpendicular to the rib 510 and connected by a second fixing device 600.

[0063] See Figure 6 In some embodiments, the second fixing device 600 includes a second washer 610, a second bolt 630, and a second nut 620. The second washer 610 is L-shaped and located at the connection between the rib 510 and the vertical rib 520. The second bolt 630 passes through the second washer 610 and the second nut 620 locks the rib 510 and the vertical rib 520 to the second washer 610. The reinforcement of the rib 510 and the vertical rib 520 by the second fixing device 600 prevents them from shaking during assembly, ensuring that the rib 510 and the vertical rib 520 are on the same mounting plane.

[0064] See Figure 1 In some embodiments, the rib 510 is provided with a plurality of tray hangers 511 to facilitate the installation of trays. The spacing between adjacent tray hangers 511 is equal so that the rib 510 is subjected to uniform force and is not easily deformed.

[0065] See Figure 2 In some embodiments, the bottom surface of the limiting rib 200 is provided with a plurality of support blocks 220. When the carrier frame 500 is installed, a downward pressing force will be generated. The support blocks 220 are suitable for supporting the limiting rib 200 and preventing the limiting rib 200 from being deformed by pressure.

[0066] In summary, this carrier plate tooling device forms a stepped structure through edge supports 110 and internal supports 120 of different heights. The edge supports 110 and internal supports 120 are connected end to end to form a carrier plate frame 500 installation station. Limiting ribs 200 are provided in the installation station. Limiting ribs 200 have limiting grooves 210 that match the ribs 510 of the carrier plate frame 500. When the carrier plate frame 500 is installed, the ribs 510 are suitable for embedding into the limiting grooves 210, thereby ensuring that the ribs 510 of the carrier plate frame 500 are on the same installation plane. In addition, several limiting members 300 are also provided on the edge supports 110. The limiting members 300 are suitable for limiting the carrier plate frame 500 and preventing it from shaking. Through the cooperation of the limiting grooves 210 and the limiting members 300, the ribs 510 of the carrier plate frame 500 are on the same installation plane and are not easy to shake during installation, thereby avoiding dimensional and positional tolerances during the installation of the carrier plate frame 500.

[0067] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0068] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0069] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0070] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0071] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A carrier board tooling apparatus, characterized by, The utility model relates to a kind of load board tooling device, including: Tooling support (100) surrounded by four edge supports (110); The inner circle of the tooling support (100) is surrounded by four internal supports (120), and the upper surface of each internal support (120) is lower than the upper edge of the edge support (110) to form a stepped structure as the erection site of the rectangular carrier frame (500); A plurality of limiting ribs (200) have a plurality of limiting grooves (210) on their surfaces, and the two ends are respectively assembled on the transversely arranged erection site; The limiting groove (210) of the limiting rib (200) is embedded with the rib (510) of the carrier frame (500), and the two ends of the rib (510) are respectively located on the longitudinally arranged erection site;And, A plurality of limiting pieces (300) are also symmetrically provided on the edge support (110), and the limiting piece (300) is suitable for limiting the carrier frame (500).

2. The carrier board tooling device of claim 1, wherein The limiting piece (300) comprises: A limiting plate (310) having two ends provided with a sliding block (311), the sliding block (311) being slidingly arranged in a sliding groove (111) on the edge support (110); A gas cylinder (320), the piston rod of the gas cylinder (320) being connected with the limiting plate (310), the gas cylinder body being connected to the edge support (110), and the gas circuit switch being controlled by a limiting handle (330); Wherein, the limiting handle (330) controls the gas cylinder (320) to push the limiting plate (310) to move towards the carrier frame (500) to make the symmetrically arranged limiting plate (310) clamp the carrier frame (500).

3. The carrier board tooling device of claim 1, wherein A first fixing device (400) is provided at the connection of adjacent edge supports (110), the first fixing device (400) comprising a first gasket (410), a first bolt (430) and a first nut (420), the first gasket (410) comprising a pair of perpendicular reinforcing ribs forming an L-shaped support structure; The first bolt (430) passes through the edge support (110) and the reinforcing ribs of the first gasket (410) in sequence and is locked by the first nut (420) to fix the first gasket (410) on the adjacent edge support (110).

4. The carrier board tooling device of claim 3, wherein The first gasket (410) is provided with a connecting lug (440) in the middle, and the first bolt (430) and the first nut (420) are symmetrically arranged on both sides of the connecting lug (440).

5. The carrier board tooling device of claim 1, wherein The carrier frame (500) further comprises a plurality of vertical ribs (520), the vertical ribs (520) being perpendicular to the rib (510) and being connected by a second fixing device (600).

6. The carrier board tooling device of claim 5, wherein The second fixing device (600) comprises a second gasket (610), a second bolt (630) and a second nut (620), the second gasket (610) is L-shaped and located at the connection between the rib (510) and the vertical rib (520), the second bolt (630) passes through the second gasket (610), and the rib (510) and the vertical rib (520) are locked with the second gasket (610) by the second nut (620).

7. The carrier board tooling device of claim 6, wherein, The rib (510) is provided with a plurality of tray hangers (511), and the adjacent tray hangers (511) have equal spacing.

8. The carrier board tooling device of claim 1, wherein, The bottom surface of the limiting rib (200) is provided with a plurality of supporting blocks (220).

9. A carrier plate tooling apparatus characterized by, Comprise: The tooling support (100) comprises a closed area surrounded by a plurality of edge supports (110) and internal supports (120), and a stepped structure composed of the edge supports (110) and the internal supports (120) is arranged in the closed area to adapt to the installation of the carrier board frame (500); A plurality of limiting ribs (200) are arranged on the tooling support (100), and at least one set of limiting grooves (210) matched with the rib (510) of the carrier board frame (500) is arranged on the limiting rib (200), the size of the limiting groove (210) is adapted to the thickness of the rib (510) to constrain the installation plane of the rib (510); A plurality of limiting members (300) are symmetrically distributed on the tooling support (100) to limit the displacement of the carrier board frame (500).

10. The carrier board tooling device of claim 9, wherein, The limiting member (300) comprises: A limiting plate (310) provided with a sliding block (311) at both ends, the sliding block (311) being slidingly arranged in a sliding groove (111) on the edge support (110); A gas cylinder (320), a piston rod of the gas cylinder (320) being connected with the limiting plate (310), a cylinder body of the gas cylinder being connected with the edge support (110) and a gas path switch being controlled by a limiting handle (330); Wherein, the limiting handle (330) and the gas cylinder (320) are matched to push the limiting plate (310) to move towards the carrier board frame (500) to make the symmetrically arranged limiting plates (310) clamp the carrier board frame (500).

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