Central device connecting first layer and second layer

Abstract

A central device for connecting a first layer and a second layer relates to the field of solar power generation, and comprises a positioning concave cavity matched with the second layer, a bracket middle part for placing the first layer, and a bracket connecting part which is arranged outside the positioning concave cavity and the bracket middle part and allows an external connecting device to intervene.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of solar power generation, particularly to the central device connecting the first layer and the second layer. BACKGROUND

[0002] In the existing multilayer photovoltaic solar roof unit, the existing W water channel needs to be fixed on the bracket according to the hole position, and then the assembly frame is pressed by the contract type clamp, which needs multiple bolts, thereby increasing the installation difficulty and labor intensity. INNOVATIVE CONTENT

[0003] The application therefore proposes the following solution: the central device connecting the first layer and the second layer, comprising a positioning cavity cooperating with the second layer and a bracket intermediate part placing the first layer, further comprising a bracket connecting part outside the positioning cavity and the bracket intermediate part, allowing external connecting devices to intervene.

[0004] Preferably, it further comprises a bracket cooperating part connected with the positioning cavity.

[0005] Preferably, the bracket cooperating part comprises an upper inclined wall and a lower inclined wall arranged in parallel and spaced apart from each other.

[0006] Preferably, the bracket connecting part is provided with an upper bracket through hole to allow the bolt to pass through.

[0007] Preferably, the bracket intermediate part comprises a limiting plate for abutting against the first layer.

[0008] Preferably, the bracket intermediate part comprises a bearing platform bearing the first layer.

[0009] Preferably, at least one bracket intermediate cavity is arranged at the lower part of the bearing platform to allow liquid to flow through.

[0010] Preferably, at least one bracket inner cavity is further arranged below the lower inclined wall to allow liquid to flow through.

[0011] Preferably, the positioning cavity comprises a bracket built-in leg connected with the vertex of the lower inclined wall and vertically downward, and a bracket built-out leg parallel to the bracket built-in leg.

[0012] Preferably, the bracket intermediate part is provided with bracket connecting parts at both ends in the horizontal direction, respectively.

[0013] The multilayer photovoltaic solar roof unit and the multilayer photovoltaic solar roof water channel of the utility model, the fixing point is not limited by the hole position, the bracket is used in combination with the pressing block, and one bolt can be fixed.

[0014] In addition, cost is saved: the new UW water tank material adopts thin-walled zinc-aluminum-magnesium steel, and the section adopts a rectangular form, the unit steel consumption is small, and the cost is saved. The structure is safe: the new UW water tank section adopts a rectangular form, the section inertia moment and the bending section modulus are large, and the structure safety is ensured. The waterproof safety is ensured: the new UW water tank section adopts a rectangular form, the effective drainage section is large, and the waterproof safety is ensured. The corrosion safety is ensured: the new UW water tank surface corrosion adopts zinc-aluminum-magnesium, and there is no additional large hole, the corrosion risk is effectively reduced, and the corrosion safety is ensured. The installation is convenient: the new UW water tank adopts a safe back pressure form to fix the photovoltaic module, only one bolt is needed at each pressing block, and the installation is ensured. The back pressure combination: the new UW water tank has a unique back pressure combination, the combination adopts a new unique inlaid mortise and tenon connection structure, and the structure safety of the water tank and the module is ensured. The maintenance is convenient: the new UW water tank support system adopts bolt connection, the later maintenance is convenient, the material is selected from steel and aluminum alloy, the recycling and secondary utilization are convenient, and the low-carbon environmental protection is realized. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of a multilayer photovoltaic solar roof unit of the present invention;

[0016] Figure 2 is a simplified perspective view of a second layer and a first fixing device in a multilayer photovoltaic solar roof unit of the present invention;

[0017] Figure 3 is a perspective view of a multilayer photovoltaic solar roof of the present invention;

[0018] Figure 4 is a simplified perspective view of a first fixing device in a multilayer photovoltaic solar roof unit of the present invention;

[0019] Figure 5 is a simplified perspective view of a component unit of a first fixing device in a multilayer photovoltaic solar roof unit of the present invention;

[0020] Figure 6 is a simplified perspective view of a component unit of a first fixing device in a multilayer photovoltaic solar roof unit of the present invention;

[0021] Figure 7 is a simplified perspective view of a component unit of a first fixing device in a multilayer photovoltaic solar roof unit of the present invention;

[0022] Figure 8 is a cross-sectional view of connecting the first layer, the second layer and the third layer, wherein the first layer is removed;

[0023] Figure 9 is a view of the component of Figure 8 after removing the third layer;

[0024] Figure 10 isometric view of a U-bolt;

[0025] Figure 11 isometric view of a baffle for cooperating with Figure 10 a U-bolt;

[0026] Figure 12 simplified view of a second layer;

[0027] Figure 13 schematic view of a first layer connected, showing photovoltaic panels;

[0028] Figure 14 isometric view of a baffle for cooperating with Figure 13 a U-bolt;

[0029] Relationship of reference numerals to terms:

[0030] 1 first layer;

[0031] 2 second layer;

[0032] 3 third layer;

[0033] 8 C-shaped panel;

[0034] 100 multi-layer photovoltaic solar roof unit;

[0035] 21 U-shaped channel;

[0036] 22 third fastening means;

[0037] 23 first fastening means;

[0038] 211 opening;

[0039] 212 closed bottom;

[0040] 213 first branch;

[0041] 215 collecting means;

[0042] 214 second branch;

[0043] 81 intermediate portion;

[0044] 82 upper portion;

[0045] 83 lower portion;

[0046] 231 bracket;

[0047] 232 upper pressing block;

[0048] 233 lower pressing block;

[0049] 2311 bracket connection portion;

[0050] 2312 bracket cooperation portion;

[0051] 2313 bracket middle part;

[0052] 2331 lower support block connection portion;

[0053] 2335 lower support block matching portion;

[0054] 2321 upper pressing block connection portion;

[0055] 2322 upper pressing block matching portion;

[0056] 2323 upper pressing block inner cavity;

[0057] 23211T-type hole;

[0058] 23212 boss;

[0059] 23221 first wedge-shaped groove;

[0060] 23222upper wedge wall;

[0061] 23223lower wedge wall;

[0062] 23111 upper bracket through hole;

[0063] 23123 lower sloping wall;

[0064] 23122 upper sloping wall;

[0065] 23311 through hole of lower support block;

[0066] 23312 hollowed out part;

[0067] 23121 second wedge-shaped groove;

[0068] 23112 bracket cavity;

[0069] 4 bolts;

[0070] 23113 bracket middle cavity;

[0071] 221 support block;

[0072] 222U-bolt;

[0073] 223 baffle;

[0074] 2231 first inclined wall;

[0075] 2232 second inclined wall;

[0076] 2233 third wedge-shaped groove;

[0077] 2234 supporting block through hole;

[0078] 2235 vertical wall;

[0079] 811 wedge-shaped protrusion;

[0080] 2215 first gap;

[0081] 2335 second gap;

[0082] 11 photovoltaic panel itself;

[0083] 12 photovoltaic panel frame;

[0084] 121 lower flat edge;

[0085] 122 receiving upright;

[0086] 123 support slot of the photovoltaic panel itself;

[0087] 2314 defining plate;

[0088] 2315 positioning cavity;

[0089] 2316 bearing platform;

[0090] 231121 bracket built-in leg;

[0091] 231122 bracket built-out leg;

[0092] 23313 lower block built-out leg;

[0093] 23314 lower block built-in leg;

[0094] 31 building roof;

[0095] 32 support frame;

[0096] 33 frame;

[0097] 34 bearing beam;

[0098] 200 power plant;

[0099] 821 horizontal positioning portion;

[0100] 822 upper recessed slot;

[0101] 832 lower recessed slot. DETAILED DESCRIPTION

[0102] As Figure 1As shown: A multi-layer photovoltaic solar roof unit 100 includes a first layer 1 as a solar photovoltaic panel, a third layer 3 as a bottom layer directly connected to the building, and a second layer 2 between the first layer 1 and the third layer 3, wherein the second layer 2 is a water-guiding and fixing device that simultaneously guides water and fixes the first layer and the third layer 3. The first layer 1 includes the photovoltaic panel itself 11 and the photovoltaic panel frame 12. The photovoltaic panel frame 12 includes a lower straight edge 121. When forming the multi-layer photovoltaic solar roof unit 100, the lower straight edge 121 is placed on the bracket connection part 2311, and the predetermined size just matches the size of the bracket connection part 2311. At the same time, the receiving column 122 abuts against the limiting plate 2314. In particular, the lower straight edge 121 extends into the first wedge-shaped groove 23221 and is pressed by the upper wedge wall 23222 of the upper pressing block 232. Therefore, the structure of the bracket arrangement in the present invention plays a role in fixing and clamping the prefabricated solar photovoltaic panel. Figure 14 Also shown is a support groove 123 for accommodating the photovoltaic panel itself.

[0103] Figure 1 and Figure 2 As can be seen in FIG, the second layer 2 includes at least two U-shaped grooves 21. Figure 4 The opening 211 of the U-shaped groove 21 faces the solar photovoltaic panel.

[0104] Figure 1 It can be seen that the second layer 2 includes a third fixing device 22 for fixing the third layer 3 set on the closed bottom 212 of the U-shaped groove 21 and a first fixing device 23 for fixing the solar panel set on the first branch 213 and the second branch 214 of the U-shaped groove.

[0105] from Figure 2 and Figure 4 As can be seen in the figure, the cross sections of the first branch 213 and the second branch 214 are C-shaped plates 8 that are away from each other and extend parallel to each other along the length direction of the solar panel.

[0106] like Figure 2 As shown, the C-shaped plate 8 includes a middle portion 81 , an upper portion 82 above the middle portion, and a lower portion 83 below the middle portion 81 .

[0107] like Figure 1 and Figure 2 As shown, the lower portion 83 is connected to the third layer 3 via a third fixing device 22 .

[0108] Figure 1 and Figure 2In the embodiment, the second layer 2 is provided with a collecting device 215 for collecting water from various meteorological phenomena and guiding the collected water to a predetermined place.

[0109] like Figure 1 , Figure 2 and Figure 3 As shown, a multi-layer photovoltaic solar roof includes the above-mentioned multi-layer photovoltaic solar roof unit 100, the two adjacent first branches 213 of the second layer 2 carry the first solar photovoltaic panel, and the two second branches 214 on the outside respectively carry the second solar photovoltaic panel and the third solar photovoltaic panel.

[0110] exist Figure 3 In the embodiment, a plurality of the second layers 2 are connected to be inclined toward one side of the building.

[0111] Figure 3 In the embodiment, the second layers 2 are arranged parallel to each other and vertically connected to the third layers 3 arranged parallel to each other.

[0112] from Figure 5 、 Figure 6 and Figure 7 The components of the first fixing device can be seen, including a bracket 231, an upper pressure block 232 that cooperates with the bracket 231 and is arranged on the upper part of the bracket 231, and a lower support block 233 that is located at the lower part of the bracket 231 and is connected to the bracket and cooperates with the groove of the upper part 82 of the C-shaped plate 8.

[0113] The bolt 4 connects the lower support block 233 and the bracket 231 from bottom to top, and because the shape of the slider of the lower support block 233 in the groove of the upper part 82 complements each other, it can move along the C-shaped plate 8. It is convenient to adjust the position of the first fixing device 23.

[0114] like Figure 5 、 Figure 6 and Figure 7 As shown, the bolts and nuts are connected into one through the bracket connecting part 2311, the lower support block connecting part 2331 and the upper pressure block connecting part 2321. At the same time, the bracket matching part 2312 and the upper pressure block matching part 2322 are matched through shape complementarity, and the lower support block matching part 2335 and the groove of the upper part 82 of the C-shaped plate 8 are matched through shape complementarity.

[0115] According to a preferred embodiment of the present invention, a bracket inner cavity 23112 is provided on the bracket 231 to increase the passage for rainwater to pass through and minimize rainwater residue. Similarly, an upper pressing block inner cavity 2323 is also provided in the upper pressing block 232.

[0116] As can be seen from the drawings, the upper pressing block 232, the lower supporting block 233 and the supporting bracket 231 are connected into a whole by setting the bolt and nut through the T-shaped hole 23211, the upper bracket hole 23111 and the lower supporting block hole 23311. Figure 7 In the present application, the lower supporting block 233 is also provided with a hollow part 23312, so as to leave extra space for installation to allow fluid to pass through.

[0117] As can be seen from the drawings, the first wedge-shaped groove 23221 is formed by the upper wedge wall 23222 and the lower wedge wall 23223 to cooperate with the second wedge-shaped groove 23121 formed by the upper inclined wall 23122 and the lower inclined wall 23123, so as to be limited and slid to the adjusted installation position.

[0118] As can be seen from the drawings, the boss 23212 can be provided with a nut or a fixed nut, so that the bolt 4 can be directly screwed to the nut, or the bolt 4 can be arranged on the boss 23212. The bolt 4 is preferably placed in the boss 23212 first, because the limiting effect of the T-shaped hole 23211 makes the bolt 4 not rotate when the nut is tightened. Then the corresponding lower supporting block hole 23311 of the supporting bracket 231 and the lower supporting block 233 is sequentially passed through the bolt 4.

[0119] The third connecting device of the present application comprises a supporting pressing block 221, a U-shaped bolt 222 passing through the supporting pressing block hole 2234 of the supporting pressing block 221, and the two branch bolts of the U-shaped bolt 222 passing through the baffle 223 at the bottom of the third layer 3, which is preferably a steel beam in the drawings, and the baffle 223 spans the width of the steel beam, so as to tightly fix the second layer 2, which is preferably a water tank in the present application, together by tightening the nut.

[0120] As can be easily thought by those skilled in the art, the supporting pressing block 221 and the lower supporting block 233 can be the same structural parts, only need to be flipped when used. Therefore, the supporting pressing block 221 and the lower supporting block 233 in the present application can be universal, reducing the number of parts and facilitating production and installation.

[0121] As can be seen from the drawings, the first inclined wall 2231 and the second inclined wall 2232 connected to the root of the first inclined wall 2231 are arranged in the supporting pressing block 221 to form the third wedge-shaped groove 2233 to cooperate with the wedge-shaped protrusion 811 on the middle part 81 of the C-shaped plate 8. Because of the existence of the vertical wall 2235, the first gap 2215 is formed after installation. As can be seen from the drawings, there is a similar second gap 2335 in the first fixing device 23. As a preferred embodiment of the present application, these gaps 2215, 2335 greatly increase the passage of liquid such as rainwater in the environment, and finally flow into the U-shaped groove 21 of the present application and flow into the designated position along the U-shaped groove 21.

[0122] In the present invention, a method for fixing the second layer and the first layer of a solar power station is also provided, comprising the following steps:

[0123] Step 1, placing the bracket 231 on the second layer 2 so that the positioning cavity 2315 of the bracket 231 is complementarily matched with the upper part 82 of the second layer 2;

[0124] Step 2, placing the lower flat edge 121 of the first layer 1 on the bearing platform 2316 of the bracket 231 so that the receiving column 122 of the first layer 1 is abutted to the limiting plate 2314;

[0125] Step 3, inserting the bolt 4 into the upper bracket through hole 23111 of the bracket 231;

[0126] Step 4, allowing the bolt shank of the bolt 4 to pass through by horizontally translating the T-shaped hole 23211 of the upper pressing block 232, accommodating the first wedge-shaped groove 23221 of the upper pressing block 232 to the upper inclined wall 23122 of the bracket 231 and the lower flat edge 121, and inserting the lower wedge wall 23223 of the upper pressing block into the second wedge-shaped groove 23121 of the bracket 231;

[0127] Step 5, placing the lower supporting block 233 from bottom to top so that the lower supporting block through hole 23311 of the lower supporting block 233 passes through the bolt rod of the bolt 4 and the third wedge-shaped groove 2233 cooperates with the wedge-shaped protrusion 811 of the upper part 82;

[0128] Step 6, tightening the nut on the bolt rod of the bolt 4 to fasten.

[0129] The bracket 231 is provided with a bracket middle cavity 23113 on the opening 211 of the water tank.

[0130] The upper pressing block 232 is provided with an upper pressing block inner cavity 2323.

[0131] In step 5, the lower supporting block inner built-in leg 23314 of the lower supporting block connection part 2331 of the lower supporting block 233 is opposite to or in contact with the bracket outer built-in leg 231122 of the bracket 231, and the lower supporting block outer built-in leg 23313 is opposite to or in contact with the outer edge of the bracket 231.

[0132] The second layer comprises a water tank for collecting and guiding rainwater to a predetermined position, and the first layer 1 comprises a photovoltaic panel.

[0133] Step 7 is also included, which is placing the product obtained by completing the step 6 on the third layer 3.

[0134] Said third layer 3 comprises a building roof 31 and a support frame 32 located on the building roof 31. As Figure 3 shown, a frame 33 is also shown, which in its entirety surrounds the first layer 1 and the second layer 2 along the outer perimeter, constituting a whole with good results both in terms of aesthetics and in terms of final water drainage from the photovoltaic panel system.

[0135] According to a preferred embodiment of the present application, said third layer 3 also comprises a load-bearing beam 34 which directly supports the product obtained from the completion of said step 6.

[0136] The power plant 200 is thus made according to the method described above. It comprises energy storage means built into said first layer 1.

[0137] In a preferred embodiment of the present application, a lower fixing device for locking the second layer 2 to a desired device comprises a first connecting device connected to said second layer and a second connecting device connected to said desired device, said first connecting device being in complementary shape with said second layer and said second connecting device being in tight fit.

[0138] Said second connecting device is provided with an upper bracket through hole 23111 which allows the passage of the bolt 4.

[0139] Said second connecting device comprises a lower bracket outer leg 23313 and a lower bracket inner leg 23314 opposite to said lower bracket outer leg so as to form a second gap 2335 with the desired device.

[0140] Said lower bracket inner leg 23314 is in the shape of a platform.

[0141] Said first connecting device is connected perpendicularly to said second connecting device forming an angular structure.

[0142] Said first connecting device comprises a lower bracket fitting part 2335 so as to be connected complementarily to the corresponding recess of the upper part 82 or lower part 83 of said second layer 2.

[0143] Said second layer is a collection device 215.

[0144] Said desired device comprises a bracket connecting part 2311 provided on said second layer.

[0145] Said desired device comprises a baffle 223.

[0146] It comprises at least two baffle through holes 2234.

[0147] Also shown in the drawings is a top fixing device for locking the first layer 1 to a desired device, comprising a clamping device for clamping the first layer and an intervention device for external connection devices to be fixedly connected to the desired device, the clamping device also allowing the top inclined wall 23122 of the desired device to be embedded therein.

[0148] The intervention device for external connection devices comprises a T-shaped hole 23211 for the head of the bolt 4.

[0149] The intervention device for external connection devices and the clamping device are connected by means of an inclined intermediate portion with an upper pressing block inner cavity 2323 so as to cooperate with the second wedge-shaped groove 23121 of the desired device.

[0150] The clamping device comprises an upper wedge wall 23222 and a lower wedge wall 23223 at an angle to the upper wedge wall 23222.

[0151] The T-shaped hole 23211 comprises opposite bosses 23212 for the head to be disposed thereon.

[0152] The lower surface of the upper wedge wall 23222 is coplanar with the lower surface of the bosses 23212 and the lower surface of the inclined intermediate portion so as to press the first layer 1.

[0153] The first layer is a photovoltaic panel.

[0154] The photovoltaic panel comprises the photovoltaic panel itself 11 and a photovoltaic panel frame 12 for placing the photovoltaic panel itself 11.

[0155] The photovoltaic panel frame 12 comprises a lower flat edge 121 which, when installed, is in contact with the lower surface of the upper wedge wall 23222.

[0156] The desired device comprises a bracket 231.

[0157] According to a preferred embodiment of the present application, as shown in Figure 6 The central device for connecting the first layer 1 and the second layer 2 comprises a positioning recess 2315 for cooperating with the second layer 2 and a bracket intermediate portion 2313 for placing the first layer, and further comprises a bracket connecting portion 2311 for allowing the intervention of external connection devices outside the positioning recess 2315 and the bracket intermediate portion 2313.

[0158] It also comprises a bracket cooperating portion 2312 connected to the positioning recess 2315.

[0159] The bracket cooperating portion 2312 comprises an upper inclined wall 23122 and a lower inclined wall 23123 arranged parallel and spaced apart from each other.

[0160] The bracket connecting portion 2311 is provided with an upper bracket through hole 23111 for allowing the bolt 4 to pass through.

[0161] The bracket middle part 2313 comprises a limiting plate 2314 for abutting against the first layer 1.

[0162] The bracket middle part 2313 comprises a bearing platform 2316 for bearing the first layer 1.

[0163] At least one bracket middle cavity 23113 is arranged at the lower part of the bearing platform 2316 to allow liquid to flow through.

[0164] At least one bracket inner cavity 23112 is further arranged below the lower inclined wall 23123 to allow liquid to flow through.

[0165] The positioning cavity 2315 comprises a bracket inner leg 231121 connected with the vertex of the lower inclined wall 23123 and vertically downward, and a bracket outer leg 231122 parallel to the bracket inner leg 231121.

[0166] The bracket middle part 2313 is provided with bracket connecting parts 2311 at both ends in the horizontal direction.

[0167] According to another preferred embodiment of the present application, a device for collecting and guiding rainwater for solar power generation comprises a first connecting part connected with a first fixing device 23 and a second connecting part connected with a third fixing device 22, and the first connecting part and the second connecting part are integrally connected vertically through a concave connecting part in a rainwater containing cavity containing rainwater.

[0168] Has a U-shaped cross section as a whole.

[0169] Comprises a first branch 213 and a second branch 214 arranged in parallel and spaced apart, which are respectively provided with the first connecting part, the second connecting part and the concave connecting part.

[0170] The first connecting part is an upper part 82, the second connecting part is a lower part 83, and the concave connecting part is a middle part 81, the highest point and the lowest point of which respectively exceed the lowest point of the upper part 82 and the highest point of the lower part 83 so as to form a wedge-shaped protrusion 811.

[0171] The upper part comprises a horizontal positioning part 821 so as to cooperate with the first fixing device.

[0172] The upper part 82 comprises an upper inward groove 822 so as to cooperate with a lower wedge wall 23223 of the first fixing device 23.

[0173] The lower part 83 comprises a lower inward groove 832 so as to cooperate with a first inclined wall 2231 of the third fixing device 22.

[0174] Also included is a closed bottom 212 connecting the first branch 213 and the second branch 214.

[0175] A second layer 2 comprising a plurality of the above described devices for collecting and directing rainwater for solar power generation.

[0176] Supporting the first layer below and collecting and directing rainwater.

[0177] The preferred embodiments of the present application are exemplarily given above with the aid of the drawings, but those skilled in the art should understand that, without exceeding the protection scope of the appended claims, those skilled in the art can form new technical solutions by adding features, combining features, etc.

Claims

1. A central device connecting a first layer (1) and a second layer (2), comprising a positioning cavity (2315) cooperating with the second layer (2) and a middle portion (2313) of a bracket for placing the first layer, characterized in that: It also includes a bracket connection portion (2311) outside the positioning cavity (2315) and the bracket middle portion (2313) that allows an external connection device to intervene.

2. The central device for connecting the first layer (1) and the second layer (2) according to claim 1, characterized in that It also includes a bracket matching portion (2312) connected to the positioning cavity (2315).

3. The central device for connecting the first layer (1) and the second layer (2) according to claim 2, characterized in that The bracket matching portion (2312) comprises an upper inclined wall (23122) and a lower inclined wall (23123) which are arranged parallel to each other and spaced apart.

4. The central device for connecting the first layer (1) and the second layer (2) according to claim 3, characterized in that The bracket connecting portion (2311) is provided with an upper bracket through hole (23111) to allow the bolt (4) to pass through.

5. The central device for connecting the first layer (1) and the second layer (2) according to claim 4, characterized in that The bracket middle portion (2313) includes a limiting plate (2314) for abutting against the first layer (1).

6. The central device for connecting the first layer (1) and the second layer (2) according to claim 5, characterized in that The bracket middle portion (2313) comprises a carrying platform (2316) for carrying the first layer (1).

7. The central device for connecting the first layer (1) and the second layer (2) according to claim 6, characterized in that At least one bracket middle cavity (23113) is provided at the lower portion of the carrying platform (2316) to allow liquid to flow through.

8. The central device for connecting the first layer (1) and the second layer (2) according to claim 6, characterized in that At least one bracket inner cavity (23112) is further provided below the lower inclined wall (23123) to allow liquid to flow through.

9. The central device for connecting the first layer (1) and the second layer (2) according to claim 3, characterized in that The positioning cavity (2315) comprises a bracket inner leg (231121) connected to the vertex of the lower inclined wall (23123) and extending vertically downward, and a bracket outer leg (231122) parallel to the bracket inner leg (231121).

10. The central device for connecting the first layer (1) and the second layer (2) according to claim 1, characterized in that The bracket middle portion (2313) is provided with bracket connection portions (2311) at both ends along the horizontal direction.

Images