Embedded computer board card installation structure

Abstract

The invention relates to the technical field of computer board card installation, and discloses an embedded computer board card installation structure which comprises a bottom plate and an installation assembly arranged above the bottom plate, the installation assembly comprises an anti-vibration mechanism fixedly installed on the top of the bottom plate, and the anti-vibration mechanism comprises a first supporting rod fixedly installed on the top of the bottom plate; a vibration-proof mechanism is arranged on the clamping transverse plate, a limiting mechanism is arranged below the vibration-proof mechanism, a fixing mechanism is arranged on the side face of the clamping transverse plate, and the fixing mechanism is located on the side face of the limiting mechanism. According to the board card, the two clamping transverse plates are arranged, the anti-vibration effect on the installed board card body can be achieved through buffer springs, the limiting mechanisms are arranged, the two clamping transverse plates can be limited, the effect of fixing the board card body is achieved, the fixing mechanisms are arranged, the clamping transverse plates can be fixed through U-shaped clamping blocks, and therefore the board card body can be fixed. And the stability of the board card body after installation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of computer board installation, in particular to an embedded computer board installation structure. Background Art

[0002] A board is a printed circuit board, abbreviated as PCB board. It is made with a plug-in and can be inserted into the slot of the computer's main circuit board (motherboard). It is used to control the operation of hardware, such as monitors, acquisition cards and other devices. After installing the driver, the corresponding hardware functions can be realized.

[0003] According to the embedded computer board installation structure proposed by Chinese patent CN220752643U, the device is designed with a mounting plate, a collar, a threaded rod and a rotating handle. When installing the embedded card body, the embedded card body can be attached to the upper surface of the mounting plate. The rotating handle can be rotated in the slide groove and the rotating groove through the collar at any time until the rotating handle is driven to rotate to the upper surface of the embedded card body, thereby realizing the assembly of the embedded card body and the mounting plate.

[0004] However, there may be some shortcomings in this patent. During the assembly of the embedded card board body and the mounting plate, the device uses threaded rods and rings to fix the embedded card board body and the mounting plate. During the long period of time between the embedded card board body and the mounting plate, the surface of the threaded rod is prone to wear, which makes it difficult to remove the ring on the surface of the threaded rod. Therefore, when the embedded card board body and the mounting plate are disassembled and repaired, the operator's disassembly time for the embedded card board body and the mounting plate will be increased, reducing work efficiency. For this reason, we propose an embedded computer board installation structure. Summary of the invention

[0005] The purpose of the present invention is to provide an embedded computer board installation structure to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an embedded computer board installation structure, comprising a base plate;

[0007] A top plate disposed above the bottom plate;

[0008] The top of the support leg is connected with the support of the top plate, and the bottom of the support leg is connected with the support of the top plate, and the bottom of the support leg is connected with the support of the top plate, and the support leg is connected with the support of the bottom plate through a hinge. When the plate body is installed, the operator can squeeze the two clamping cross plates up and down respectively, so that the two clamping cross plates slide along the outer wall of the support rod one through the slider one, so that the slider one connects with the spring to squeeze. Then the operator can place the plate body inside the clamping cross plate. After the bottom outer wall of the plate body fits with the inner wall of the clamping cross plate, the slider one will be reset under the reaction of the connecting spring, so that the plate body can be clamped and fixed under the action of the two clamping cross plates, so as to realize the installation of the plate body. After the installation of the plate body is completed, the slider two slides on the outer wall of the cross bar. During the movement of the slider two, the buffer spring will be compressed, so that the support rod two rotates, so that the support rod two props up the clamping cross plate. The clamping cross plate can be anti-vibrated under the action of the slider one and the connecting spring, so as to prevent the plate body from vibrating after the installation is completed.

[0009] A limiting mechanism is provided below the anti-vibration mechanism;

[0010] A fixing mechanism is arranged on the side of the clamping horizontal plate, and the fixing mechanism is located on the side of the limiting mechanism.

[0011] Preferably, the limiting mechanism includes a clamping rod movably installed on one of the side walls of the clamping cross plate through a hinge, the other end of the clamping rod is slidably connected to a ratchet, and the inner wall of the ratchet is fixedly installed with a fixing column, the end face of the fixing column is fixedly connected to the side wall of the other clamping cross plate, one side of the clamping rod is slidably connected to the limiting column, the end face of the limiting column is fixedly connected to the side wall of the other clamping cross plate, the other side of the clamping rod is fixedly connected to a limiting spring, and the other end of the limiting spring is fixedly connected to a side plate, and the side wall of the side plate is fixedly connected to the side wall of the clamping cross plate. By setting the limiting mechanism, after the installation of the board card body is completed, the operator can squeeze the clamping rod to both sides to prompt the clamping rod to squeeze the limiting spring. When the two clamping cross plates are fixedly installed on the board card body, the operator can release the clamping rod, and the clamping rod will be reset under the reaction of the limiting spring, prompting the clamping rod to insert into the side wall of the ratchet, so as to realize the installation and fixation of the two clamping cross plates to the board card body, thereby improving the installation effect of the board card body.

[0012] Preferably, the fixing mechanism comprises a T-slot provided on the side wall of the clamping horizontal plate, the inner wall of the T-slot is provided with a limiting slot, the inner wall of the T-slot is slidably connected with a U-shaped block, the side wall of the U-shaped block is fixedly installed with a rectangular block, the inner wall of the side surface of the rectangular block is fixedly connected with a compression spring, the other end of the compression spring is fixedly installed with an extrusion block, the outer wall of the extrusion block is slidably connected with the inner wall of the rectangular block, a limiting plug rod is fixedly installed on the other side of the extrusion block, and the outer wall of the other end of the limiting plug rod slides with the inner wall of the limiting slot The U-shaped card block is used to limit the two clamping horizontal plates, so as to improve the stability of the board body after the board body is installed.

[0013] Preferably, there are four support rods 1, the four support rods 1 are equal in size, and the four support rods 1 are equidistantly fixedly installed at the four corners of the top of the base plate. Through this arrangement, the base plate and the top plate can be conveniently connected through the four support rods 1.

[0014] Preferably, there are two clamping cross plates, the two clamping cross plates are equal in size, and the two clamping cross plates are symmetrically distributed along the center plane of support rod one. Through this arrangement, the board body can be easily installed and fixed through the two clamping cross plates.

[0015] Preferably, the outer wall of the slider 2 is matched with the inner wall of the slide groove, and the inner wall of the slider 2 is slidably connected with the outer wall of the cross bar. Through this arrangement, the slider 2 can slide easily inside the slide groove.

[0016] Preferably, the outer wall of one end of the clamping rod is slidably connected to the inner wall of the side surface of the ratchet. Through this arrangement, the clamping rod can easily limit the ratchet.

[0017] Preferably, there are four U-shaped card blocks, the four U-shaped card blocks are equal in size, and the four U-shaped card blocks are divided into two groups. The two groups of U-shaped card blocks are symmetrically distributed along the center plane of the board body. Through this arrangement, the four U-shaped card blocks can be used to facilitate the limiting of the clamping cross plate, thereby improving the stability of the clamping cross plate after installation on the board body.

[0018] The present invention provides an embedded computer board installation structure. The embedded computer board installation structure has the following beneficial effects:

[0019] (1) The embedded computer board installation structure is provided with an anti-vibration mechanism. When installing the board body, the operator can press the two clamping cross plates up and down respectively, so that the two clamping cross plates slide along the outer wall of the support rod one through the slider one, so that the slider one presses the connecting spring. Then the operator can place the board body inside the clamping cross plate. After the bottom outer wall of the board body fits with the inner wall of the clamping cross plate, the clamping cross plate is released. Under the reaction of the connecting spring, the slider one is reset, so that the board body can be clamped and fixed under the action of the two clamping cross plates, so as to achieve the installation of the board body. After the board body is installed, the slider two slides on the outer wall of the cross bar. During the movement of the slider two, the buffer spring is compressed, so that the support rod two rotates, so that the support rod two props up the clamping cross plate. Under the action of the slider one and the connecting spring, the clamping cross plate can be anti-vibrated to prevent the board body from vibrating after installation.

[0020] (2) The embedded computer board installation structure is provided with a limit mechanism. After the board body is installed, the operator can press the clamping rod toward both sides to cause the clamping rod to press the limit spring. When the two clamping cross plates are fixed to the board body, the operator can release the clamping rod. Under the reaction of the limit spring, the clamping rod will be reset, causing the clamping rod to be inserted into the side wall of the ratchet wheel, so as to achieve the installation and fixation of the two clamping cross plates to the board body, thereby improving the installation effect of the board body.

[0021] (3) The embedded computer board installation structure is provided with a fixing mechanism. After the clamping rod has limited the two clamping horizontal plates, the operator can press the extrusion block to cause the extrusion block to compress the compression spring, causing the extrusion block to move with the limiting rod, and then insert the U-shaped block into the inside of the T-shaped slot. Then, by releasing the extrusion block, the extrusion block and the limiting rod will be reset under the reaction of the compression spring, causing the limiting rod to be inserted into the inside of the limiting slot, and the two clamping horizontal plates can be limited by the U-shaped block to improve the stability of the board body after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the installation components in the present invention;

[0024] Figure 3 It is a structural schematic diagram of the anti-vibration mechanism in the present invention;

[0025] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0026] Figure 5 It is a structural schematic diagram of the limiting mechanism in the present invention;

[0027] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0028] Figure 7 It is a structural schematic diagram of the fixing mechanism in the present invention;

[0029] Figure 8 for Figure 7 A partial enlarged view of point C in the middle.

[0030] In the figure: 1, bottom plate; 2, top plate; 3, mounting assembly; 31, anti-vibration mechanism; 311, support rod 1; 312, slider 1; 313, connecting spring; 314, clamping cross plate; 315, board body; 316, slide groove; 317, cross bar; 318, slider 2; 319, buffer spring; 3110, support rod 2; 32, limiting mechanism; 321, clamping rod; 322, ratchet; 323, fixing column; 324, limiting column; 325, limiting spring; 326, side plate; 33, fixing mechanism; 331, T-slot; 332, limiting slot; 333, U-shaped block; 334, rectangular block; 335, compression spring; 336, extrusion block; 337, limiting plug rod. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0032] Example 1

[0033] A preferred embodiment of an embedded computer board installation structure provided by the present invention is as follows: Figures 1 to 8 As shown: an embedded computer board installation structure, including a base plate 1;

[0034] A top plate 2 disposed above the bottom plate 1;

[0035] And a mounting assembly 3 arranged above the bottom plate 1, the mounting assembly 3 includes an anti-vibration mechanism 31 fixedly mounted on the top of the bottom plate 1, the anti-vibration mechanism 31 includes a support rod 311 fixedly mounted on the top of the bottom plate 1, the top of the support rod 311 is fixedly connected to the bottom of the top plate 2, the outer wall of the support rod 311 is slidably connected with a slider 312, the bottom of the slider 312 is fixedly connected with a connecting spring 313, the other end of the connecting spring 313 is fixedly connected to the top of the bottom plate 1, the side wall of the slider 312 is fixedly mounted with a clamping cross plate 314, the clamping cross plate The top inner wall of 314 is slidably connected with a card body 315, a slide groove 316 is provided at the bottom of the top plate 2, a cross bar 317 is fixedly installed on the inner wall of the slide groove 316, a slider 318 is slidably connected to the outer wall of the cross bar 317, a buffer spring 319 is fixedly connected to the side wall of the slider 318, the other end of the buffer spring 319 is fixedly connected to the inner wall of the slide groove 316, a support rod 3110 is movably installed at the bottom of the slider 318 through a hinge, and the other end of the support rod 3110 is movably connected to the top of another clamping horizontal plate 314 through a hinge;

[0036] A limit mechanism 32 is provided below the anti-vibration mechanism 31;

[0037] A fixing mechanism 33 is provided on the side of the clamping cross plate 314, and the fixing mechanism 33 is located on the side of the limiting mechanism 32. By providing the anti-vibration mechanism 31, the board body 315 can be easily installed through the clamping cross plate 314, and the buffer spring 319 can achieve an anti-vibration effect on the board body 315 after installation. By providing the limiting mechanism 32, the two clamping cross plates 314 can be limited to achieve the effect of fixing the board body 315. By providing the fixing mechanism 33, the clamping cross plate 314 can be fixed by the U-shaped block 333, thereby improving the stability of the board body 315 after installation.

[0038] In this embodiment, by providing the anti-vibration mechanism 31, when installing the board card body 315, the operator can squeeze the two clamping cross plates 314 up and down respectively, so that the two clamping cross plates 314 slide along the outer wall of the support rod 1 311 through the slider 1 312, so that the slider 1 312 squeezes the connecting spring 313. Then the operator can place the board card body 315 inside the clamping cross plate 314. After the bottom outer wall of the board card body 315 fits with the inner wall of the clamping cross plate 314, the operator releases the clamping cross plate 314, and the slider 1 312 is reset under the reaction of the connecting spring 313, so that The two clamping cross plates 314 can clamp and fix the board body 315 to achieve the installation of the board body 315. After the board body 315 is installed, the slider 2 318 slides on the outer wall of the cross bar 317. During the movement of the slider 2 318, the buffer spring 319 is compressed, causing the support rod 2 3110 to rotate, causing the support rod 2 3110 to support the clamping cross plate 314. The slider 1 312 and the connecting spring 313 can achieve an anti-vibration effect on the clamping cross plate 314, thereby preventing the board body 315 from vibrating after installation.

[0039] Example 2

[0040] Based on Example 1, a preferred embodiment of an embedded computer board installation structure provided by the present invention is as follows: Figures 1 to 8 As shown: the limiting mechanism 32 includes a clamping rod 321 which is movably installed on one of the side walls of the clamping cross plate 314 through a hinge, the other end of the clamping rod 321 is slidably connected to a ratchet 322, the inner wall of the ratchet 322 is fixedly installed with a fixing column 323, the end face of the fixing column 323 is fixedly connected to the side wall of the other clamping cross plate 314, one side of the clamping rod 321 is slidably connected to the limiting column 324, the end face of the limiting column 324 is fixedly connected to the side wall of the other clamping cross plate 314, the other side of the clamping rod 321 is fixedly connected to a limiting spring 325, the other end of the limiting spring 325 is fixedly connected to a side plate 326, and the side wall of the side plate 326 is fixedly connected to the side wall of the clamping cross plate 314.

[0041] In this embodiment, by setting a limit mechanism 32, after the installation of the board body 315 is completed, the operator can squeeze the clamping rod 321 to both sides, causing the clamping rod 321 to squeeze the limit spring 325. When the two clamping cross plates 314 fix the board body 315, the operator can release the clamping rod 321, and the clamping rod 321 will be reset under the reaction of the limit spring 325, causing the clamping rod 321 to be inserted into the side wall of the ratchet 322, so as to achieve the installation and fixation of the board body 315 by the two clamping cross plates 314, thereby improving the installation effect of the board body 315.

[0042] Example 3

[0043] On the basis of Embodiment 1 and Embodiment 2, a preferred embodiment of an embedded computer board installation structure provided by the present invention is as follows: Figures 1 to 8 As shown: the fixing mechanism 33 includes a T-slot 331 opened on the side wall of the clamping horizontal plate 314, the inner wall of the T-slot 331 is opened with a limiting slot 332, the inner wall of the T-slot 331 is slidably connected with a U-shaped block 333, the side wall of the U-shaped block 333 is fixedly installed with a rectangular block 334, the inner wall of the side of the rectangular block 334 is fixedly connected with a compression spring 335, the other end of the compression spring 335 is fixedly installed with an extrusion block 336, the outer wall of the extrusion block 336 is slidably connected to the inner wall of the rectangular block 334, the other side of the extrusion block 336 is fixedly installed with a limiting rod 337, and the outer wall of the other end of the limiting rod 337 is slidably connected to the inner wall of the limiting slot 332.

[0044] In this embodiment, by setting a fixing mechanism 33, after the clamping rod 321 has completed the limiting of the two clamping cross plates 314, the operator can press the extrusion block 336 to cause the extrusion block 336 to compress the compression spring 335, causing the extrusion block 336 to move with the limiting rod 337, and then insert the U-shaped block 333 into the interior of the T-slot 331, and then release the extrusion block 336. Under the reaction of the compression spring 335, the extrusion block 336 and the limiting rod 337 will be reset, causing the limiting rod 337 to be inserted into the interior of the limiting slot 332, and the two clamping cross plates 314 are limited by the U-shaped block 333 to improve the stability of the board body 315 after installation.

[0045] Furthermore, there are four support rods 311, which are equal in size and fixedly installed at the four corners of the top of the base plate 1 at equal distances. Through this arrangement, the base plate 1 and the top plate 2 can be conveniently connected through the four support rods 311.

[0046] Furthermore, there are two clamping cross plates 314 , which are equal in size and symmetrically distributed along the center plane of the support rod 311 . Through this arrangement, the board body 315 can be easily installed and fixed through the two clamping cross plates 314 .

[0047] Furthermore, the outer wall of the second slider 318 is matched with the inner wall of the slide groove 316, and the inner wall of the second slider 318 is slidably connected with the outer wall of the cross bar 317. Through this arrangement, the second slider 318 can slide inside the slide groove 316.

[0048] Furthermore, the outer wall of one end of the clamping rod 321 is slidably connected to the inner wall of the side of the ratchet 322. Through this arrangement, the clamping rod 321 can easily limit the ratchet 322.

[0049] In addition, there are four U-shaped blocks 333, and the four U-shaped blocks 333 are equal in size. The four U-shaped blocks 333 are divided into two groups, and the two groups of U-shaped blocks 333 are symmetrically distributed along the center plane of the board body 315. Through this arrangement, the four U-shaped blocks 333 can be used to easily limit the clamping cross plate 314, thereby improving the stability of the clamping cross plate 314 after installation on the board body 315.

[0050] Working principle: When installing the board card body 315, the operator can squeeze the two clamping cross plates 314 up and down respectively, so that the two clamping cross plates 314 slide along the outer wall of the support rod 1 311 through the slider 1 312, so that the slider 1 312 squeezes the connecting spring 313, and then the operator can place the board card body 315 inside the clamping cross plate 314. After the bottom outer wall of the board card body 315 fits with the inner wall of the clamping cross plate 314, the clamping cross plate 314 is released, and the slider 1 312 is reset under the reaction of the connecting spring 313, so that the two clamping cross plates The plate 314 can clamp and fix the board body 315 to achieve the installation of the board body 315. After the board body 315 is installed, the slider 2 318 slides on the outer wall of the cross bar 317. During the movement of the slider 2 318, the buffer spring 319 is compressed, prompting the support rod 2 3110 to rotate, prompting the support rod 2 3110 to support the clamping cross plate 314. The slider 1 312 and the connecting spring 313 can achieve the effect of anti-vibration of the clamping cross plate 314, preventing the board body 315 from vibrating after installation. The clamping rod 321 can be pressed against the locking plate 314 to prevent the locking plate 314 from being loosened and the locking plate 314 from being loosened. After the positioning is completed, the operator can press the extrusion block 336 to compress the compression spring 335, causing the extrusion block 336 to move with the limiting rod 337, and then insert the U-shaped block 333 into the T-slot 331, and then release the extrusion block 336. Under the reaction of the compression spring 335, the extrusion block 336 and the limiting rod 337 will be reset, prompting the limiting rod 337 to be inserted into the limiting slot 332, and the two clamping cross plates 314 are limited by the U-shaped block 333 to improve the stability of the board body 315 after installation.

[0051] The above description is only an illustrative specific implementation mode of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention. It should also be noted that the various components of the present invention are not limited to the above-mentioned overall application. The various technical features described in the specification of the present invention can be selected one by one or multiple ones can be selected and used in combination according to actual needs. Therefore, the present invention should naturally cover other combinations and specific applications related to this case.

Claims

1. An embedded computer board installation structure, comprising a base plate (1); A top plate (2) arranged above the bottom plate (1); and a mounting assembly (3) arranged above the base plate (1), characterized in that: The mounting assembly (3) comprises an anti-vibration mechanism (31) fixedly mounted on the top of the base plate (1), the anti-vibration mechanism (31) comprising a support rod (311) fixedly mounted on the top of the base plate (1), the top of the support rod (311) being fixedly connected to the bottom of the top plate (2), the outer wall of the support rod (311) being slidably connected to a slider (312), the bottom of the slider (312) being fixedly connected to a connecting spring (313), the other end of the connecting spring (313) being fixedly connected to the top of the base plate (1), the side wall of the slider (312) being fixedly mounted to a clamping cross plate (314), the top of the clamping cross plate (314) The inner wall is slidably connected with a board card body (315), a slide groove (316) is provided at the bottom of the top plate (2), a cross bar (317) is fixedly installed on the inner wall of the slide groove (316), a slider 2 (318) is slidably connected to the outer wall of the cross bar (317), a buffer spring (319) is fixedly connected to the side wall of the slider 2 (318), the other end of the buffer spring (319) is fixedly connected to the inner wall of the slide groove (316), a support rod 2 (3110) is movably installed at the bottom of the slider 2 (318) through a hinge, and the other end of the support rod 2 (3110) is movably connected to the top of another clamping cross plate (314) through a hinge; A limiting mechanism (32) is provided below the anti-vibration mechanism (31); A fixing mechanism (33) is provided on the side of the clamping transverse plate (314), and the fixing mechanism (33) is located on the side of the limiting mechanism (32).

2. The embedded computer board installation structure according to claim 1, characterized in that: The limiting mechanism (32) includes a clamping rod (321) movably mounted on the side wall of one of the clamping transverse plates (314) through a hinge, the other end of the clamping rod (321) is slidably connected to a ratchet (322), the inner wall of the ratchet (322) is fixedly mounted with a fixing column (323), the end face of the fixing column (323) is fixedly connected to the side wall of the other clamping transverse plate (314), one side of the clamping rod (321) is slidably connected to a limiting column (324), the end face of the limiting column (324) is fixedly connected to the side wall of the other clamping transverse plate (314), the other side of the clamping rod (321) is fixedly connected to a limiting spring (325), the other end of the limiting spring (325) is fixedly connected to a side plate (326), and the side wall of the side plate (326) is fixedly connected to the side wall of the clamping transverse plate (314).

3. The embedded computer board installation structure according to claim 1, characterized in that: The fixing mechanism (33) comprises a T-shaped slot (331) provided on the side wall of the clamping horizontal plate (314); a limiting slot (332) is provided on the inner wall of the T-shaped slot (331); a U-shaped clamping block (333) is slidably connected to the inner wall of the T-shaped slot (331); a rectangular block (334) is fixedly installed on the side wall of the U-shaped clamping block (333); a compression spring (335) is fixedly connected to the inner wall of the side of the rectangular block (334); an extrusion block (336) is fixedly installed on the other end of the compression spring (335); an outer wall of the extrusion block (336) is slidably connected to the inner wall of the rectangular block (334); a limiting plug rod (337) is fixedly installed on the other side of the extrusion block (336); and the outer wall of the other end of the limiting plug rod (337) is slidably connected to the inner wall of the limiting slot (332).

4. The embedded computer board installation structure according to claim 1, characterized in that: There are four support rods (311), the four support rods (311) are of equal size, and the four support rods (311) are equidistantly fixedly mounted at the four corners of the top of the base plate (1).

5. The embedded computer board installation structure according to claim 1, characterized in that: There are two clamping transverse plates (314), the two clamping transverse plates (314) are equal in size, and the two clamping transverse plates (314) are symmetrically distributed along the central plane of the support rod (311).

6. The embedded computer board installation structure according to claim 1, characterized in that: The outer wall of the second slider (318) is matched with the inner wall of the slide groove (316), and the inner wall of the second slider (318) is slidably connected with the outer wall of the cross bar (317).

7. The embedded computer board installation structure according to claim 2, characterized in that: An outer wall at one end of the clamping rod (321) is slidably connected to an inner wall of a side surface of the ratchet wheel (322).

8. The embedded computer board installation structure according to claim 3, characterized in that: There are four U-shaped card blocks (333), the four U-shaped card blocks (333) are equal in size, the four U-shaped card blocks (333) are divided into two groups, and the two groups of U-shaped card blocks (333) are symmetrically distributed along the central plane of the board body (315).

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