Grading device for gear division of photovoltaic module

Abstract

The gear dividing device comprises a cross beam extending in the first direction, and the top face of the cross beam is provided with a first sliding rail extending in the first direction; the stand columns extend in the vertical direction and are distributed at intervals in the first direction; the cross beam is fixedly connected to the top faces of the multiple stand columns. The first rod piece extends in the second direction and is in sliding connection with the first sliding rail through a first sliding block; the side face, perpendicular to the first direction, of the first rod piece is provided with a second sliding rail extending in the second direction. The first mounting seat is in sliding connection with the second sliding rail through a second sliding block; the second rod piece extends in the vertical direction and is of a hollow structure; a third sliding rail extending in the vertical direction is arranged on the face, facing the first mounting base, of the second rod piece. The second mounting seat is rotationally connected to the bottom of the second rod piece; and the grabbing assembly is rotationally connected to the bottom of the second mounting base. According to the grading device, the design of the cross beam and the first rod piece is improved, and the assembling and machining workload can be greatly reduced.

Description

Technical Field

[0001] This specification relates to the technical field of photovoltaic module grading, and particularly to a grading device for photovoltaic module grading. Background Art

[0002] The grading machine usually consists of a manipulator assembly and a grading mechanism, which is used for the grading of photovoltaic modules. It divides grades according to the power of the modules and automatically grabs and places them throughout the process. The manipulator assembly includes a first manipulator and a second manipulator. There is a transition platform between multiple grading mechanisms, which divides the grading mechanism into a first operation area and a second operation area. The first manipulator is responsible for transporting the photovoltaic modules to the first operation area, and the second manipulator is responsible for transporting the photovoltaic modules to the second operation area. This design reduces the movement stroke of the manipulator rising or falling and improves the work efficiency.

[0003] During the manufacturing process of photovoltaic modules, the grading machine significantly improves the production efficiency and reduces the labor cost through automated operation and high-speed sorting capabilities. Through precise detection and classification, it can ensure the stable and reliable quality of the battery chips, reduce the defective product rate, and improve the overall performance of the photovoltaic system. With the rapid development of the photovoltaic industry, the grading machine plays an increasingly important role in improving production efficiency and product quality, and the market demand is also increasing continuously.

[0004] However, the grading machines in the prior art adopt spliced crossbeams and spliced cantilevers. The length of the crossbeam reaches more than ten meters, and the processing accuracy requirements are high. The high-altitude crossbeam will cause inconvenience in high-altitude operations, and the on-site splicing and installation are complex and time-consuming. Moreover, in the case of high load, the high-speed crosswise movement requires high stability, and the life of the crosswise axis slider is short. Summary of the Invention

[0005] In view of the deficiencies of the prior art, an object of this specification is to provide a grading device for photovoltaic module grading, which improves the designs of the crossbeam and the first rod, and can greatly reduce the workload of assembly and processing.

[0006] To achieve the above object, an embodiment of this specification provides a grading device for photovoltaic module grading, including: A crossbeam extending in a first direction, and a first slide rail extending in the first direction is provided on the top surface of the crossbeam; A plurality of columns extending in a vertical direction, and the plurality of columns are spaced apart in the first direction; the crossbeam is fixedly connected to the top surfaces of the plurality of columns; the first direction is perpendicular to the vertical direction; A first rod extending along a second direction, wherein the second direction, the first direction and the vertical direction are perpendicular to each other; the first rod is slidably connected to the first slide rail via a first slider; a second slide rail extending along the second direction is provided on a side of the first rod perpendicular to the first direction; A first mounting seat is disposed on one side of the first slide rail and the first mounting seat is slidably connected to the second slide rail via a second sliding block; a second rod member located on a side of the first mounting seat away from the first rod member, the second rod member extending along the vertical direction and adopting a hollow structure; a third slide rail extending along the vertical direction is provided on a side of the second rod member facing the first mounting seat; the first mounting seat is slidably connected to the third slide rail via a third slider; A second mounting base rotatably connected to the bottom of the second rod; the rotation axis of the second mounting base extends along the vertical direction; A grabbing assembly is rotatably connected to the bottom of the second mounting seat, and the rotating axis of the grabbing assembly extends along the second direction; a plurality of suction cups are arranged on a side of the grabbing assembly away from the second mounting seat.

[0007] As a preferred implementation, the crossbeam is formed by connecting three steel pipes extending along the first direction in sequence, and the shape of the steel pipes is a hollow rectangle.

[0008] As a preferred implementation, the first rod is integrally formed.

[0009] As a preferred implementation, the second rod is made of aluminum.

[0010] As a preferred embodiment, the first rod is connected to a first driving member for driving the first rod to move along the first direction relative to the crossbeam; the first mounting seat is connected to a second driving member for driving the first mounting seat to move along the second direction relative to the first rod; the second driving member includes a screw rod; the second rod is connected to a third driving member for driving the second rod to move along the vertical direction relative to the first rod.

[0011] As a preferred embodiment, an electric box is fixedly provided above one end of the first rod connected to the crossbeam, and the second slide rail is located at the other end of the first rod where the electric box is provided.

[0012] As a preferred embodiment, the second mounting seat is connected to a fourth driving member for driving the second mounting seat to rotate around the vertical direction relative to the second rod; a first opening for accommodating the fourth driving member is provided at the bottom of the second rod.

[0013] As a preferred embodiment, the second mounting seat includes a first connecting plate and two second connecting plates. The two second connecting plates are located at both ends of the first connecting plate in the second direction; on the side of the grasping assembly close to the second mounting seat, there are two third connecting plates, and the two third connecting plates are respectively rotatably connected to the two second connecting plates.

[0014] As a preferred embodiment, the third connecting plate is connected with a fifth driving member for driving the third connecting plate to drive the grasping assembly to rotate relative to the second connecting plate around the second direction; the first connecting plate and the two second connecting plates form a second opening for accommodating the fifth driving member.

[0015] As a preferred embodiment, the number of the first rods is two, and the two first rods are arranged at intervals in the first direction; in the second direction, the two first rods are located on the same side of the cross beam. Beneficial effects

[0016] The grading device for photovoltaic module grading provided by this embodiment includes a cross beam, a column, a first rod, a first mounting seat, a second rod, a second mounting seat and a grasping assembly, with a simple structure and convenient connection. In particular, the design of the cross beam and the first rod is improved. There is only one cross beam extending in the first direction and one first rod extending in the second direction, avoiding the disadvantages of large assembly quantity and large processing quantity of the frame-type cross beam and frame-type first rod. It can greatly reduce the workload of assembly and processing, while reducing the workload of welding, increasing the convenience of processing, and improving the precision of the slide rail joint.

[0017] Moreover, replacing the frame-type first rod with one first rod can reduce the number of first sliders used to connect the first rod and the cross beam, and improve the assembly integration. The second rod adopts a hollow structure, which can reduce the weight. While increasing the structural strength, it tries to reduce its own weight as much as possible, thus creating conditions for using one cross beam and one first rod.

[0018] At the same time, in this application, by setting a first slide rail extending in the first direction, a second slide rail extending in the second direction, a third slide rail extending in the vertical direction, the rotation axis of the second mounting seat extending in the vertical direction, and the rotation axis of the grasping assembly extending in the second direction, five-axis drive can be realized, and it is compatible with various types of photovoltaic modules, feeding methods, and placement methods (for example, long side horizontal insertion, short side vertical insertion, flat placement, etc.).

[0019] Referring to the following description and the drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0020] Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with features in other embodiments, or instead of features in other embodiments.

[0021] It should be emphasized that the term "comprising / including" as used herein refers to the presence of features, whole things, steps or components, but does not exclude the presence or addition of one or more other features, whole things, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic perspective view of a grading device for grading photovoltaic modules provided in this embodiment; Figure 2 Schematic view of a cross beam and a column provided in this embodiment; Figure 3 Schematic view of a cross beam provided in this embodiment; Figure 4 For Figure 3 Enlarged schematic view of the steel pipe in; Figure 5 Schematic view of the part of the grading device other than the cross beam and the column provided in this embodiment; Figure 6 For Figure 5 Rear view of.

[0024] Description of reference numerals: 1, cross beam; 11, steel pipe; 2, column; 3, first rod; 4, first mounting seat; 5, second rod; 51, first opening; 6, second mounting seat; 61, first connecting plate; 62, second connecting plate; 63, second opening; 7, grasping assembly; 71, suction cup; 72, third connecting plate; 8, electrical box; 9, first slide rail; 10, second slide rail; 12, second slider; 13, third slide rail; 14, third slider; 15, second driving member; 16, third driving member; 17, fourth driving member; 18, fifth driving member; X, first direction; Y, second direction; Z, vertical direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be another intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be another intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific implementation manners and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] Please refer to Figures 1 to 6 。This application embodiment provides a grading device for photovoltaic module grading, including a cross beam 1, columns 2, a first rod 3, a first mounting seat 4, a second rod 5, a second mounting seat 6 and a grasping assembly 7.

[0029] Among them, as Figures 2 to 4 shown, the cross beam 1 extends along the first direction X. The top surface of the cross beam 1 is provided with a first slide rail 9 extending along the first direction X. A plurality of columns 2 extend along the vertical direction Z. The plurality of columns 2 are spaced apart in the first direction X. The cross beam 1 is fixedly connected to the top surfaces of the plurality of columns 2, and the bottom surfaces of the columns 2 are fixedly connected to the working surface (for example, the ground) for supporting the entire grading device on the working surface.

[0030] As Figure 5 and Figure 6As shown, the first rod 3 extends along the second direction Y. The second direction Y, the first direction X and the vertical direction Z are perpendicular to each other, and the first direction X and the second direction Y can be two directions perpendicular to each other in a horizontal plane. The first rod 3 is slidably connected to the first slide rail 9 through a first slider (not shown). The side of the first rod 3 perpendicular to the first direction X is provided with a second slide rail 10 extending along the second direction Y. The second slide rail 10 is located at one end of the first rod 3, and the other end of the first rod 3 is connected to the crossbeam 1. The first mounting seat 4 is located on the side of the first rod 3 where the first slide rail 9 is provided. The first mounting seat 4 is slidably connected to the second slide rail 10 through a second slider 12.

[0031] The second rod 5 is located on the side of the first mounting seat 4 away from the first rod 3. The second rod 5 extends along the vertical direction Z and adopts a hollow structure, which can reduce weight, thereby creating conditions for adopting an integrated cantilever (i.e., the first rod 3). The second rod 5 is provided with a third slide rail 13 extending along the vertical direction Z on a side facing the first mounting seat 4. The first mounting seat 4 is slidably connected to the third slide rail 13 through a third slider 14.

[0032] The second mounting seat 6 is rotatably connected to the bottom of the second rod 5. The rotation axis of the second mounting seat 6 extends along the vertical direction Z. The grabbing assembly 7 is rotatably connected to the bottom of the second mounting seat 6. The rotation axis of the grabbing assembly 7 extends along the second direction Y. A plurality of suction cups 71 are provided on a side of the grabbing assembly 7 away from the second mounting seat 6 for sucking the photovoltaic assembly.

[0033] The grading device for grading the photovoltaic module provided in this embodiment includes a crossbeam 1, a column 2, a first rod 3, a first mounting seat 4, a second rod 5, a second mounting seat 6 and a grab assembly 7, and has a simple structure and convenient connection. In particular, the design of the crossbeam 1 and the first rod 3 is improved, and there is only one crossbeam 1 extending along the first direction X and one first rod 3 extending along the second direction Y, which avoids the disadvantages of large assembly and processing of the frame-type crossbeam 1 and the frame-type first rod 3, which can greatly reduce the workload of assembly and processing, and at the same time can reduce the workload of welding, increase the convenience of processing, and improve the accuracy of the slide rail joint.

[0034] In addition, by replacing the frame-type first rod 3 with a first rod 3, the number of first sliders used to connect the first rod 3 with the crossbeam 1 can be reduced, thereby improving the assembly integration. The second rod 5 adopts a hollow structure to reduce weight, while increasing the structural strength, reducing its own weight as much as possible, thereby creating conditions for using a crossbeam 1 and the first rod 3.

[0035] At the same time, the present application can realize five-axis drive by setting a first slide rail 9 extending along the first direction X, a second slide rail 10 extending along the second direction Y, a third slide rail 13 extending along the vertical direction Z, the rotation axis of the second mounting seat 6 extending along the vertical direction Z, and the rotation axis of the grabbing component 7 extending along the second direction Y. It is compatible with various photovoltaic component formats, feeding methods, and placement methods (for example, the long side can be inserted horizontally, the short side can be inserted vertically, placed flat, etc.).

[0036] In this embodiment, if Figure 3 As shown, the crossbeam 1 is formed by connecting three steel pipes 11 extending along the first direction X in sequence. The shape of the steel pipe 11 is a hollow rectangle, which can appropriately reduce the weight of the device. Specifically, the length of the steel pipe 11 located in the middle is less than the length of the steel pipes 11 located on both sides. When installing the crossbeam 1, it is only necessary to connect the three steel pipes 11 in sequence. The end faces of the steel pipes 11 are butted, which is simple and convenient to operate. There is no need to assemble other frame structures, which can reduce the splicing and assembly time. When the first rod 3 is subsequently installed, it is only necessary to connect the first rod 3 to the first slide rail 9 on the steel pipe 11 through the first slider.

[0037] Specifically, two columns 2 are installed corresponding to each steel pipe 11, and the two columns 2 corresponding to the middle steel pipe 11 are respectively arranged near the two ends of the steel pipe 11; among the two columns 2 corresponding to the steel pipes 11 at the two sides, one column 2 is arranged near the end of the steel pipe 11 away from the middle steel pipe 11, and the other column 2 is arranged near the middle position of the steel pipe 11. The total length of the beam 1 is about 15 meters.

[0038] In this embodiment, the first rod 3 is made by an integrated molding process to form an integrated cantilever. The first rod 3 is connected to a first driving member (not shown) for driving the first rod 3 to move relative to the crossbeam 1 along the first direction X. The first driving member can be a linear motor. The material of the second rod 5 is aluminum, which can reduce the weight by two-thirds, greatly reduce the Z-axis load, and facilitate the realization of the structure of the integrated cantilever.

[0039] like Figure 6 As shown, the first mounting seat 4 is connected to a second driving member 15 for driving the first mounting seat 4 to move relative to the first rod 3 along the second direction Y. The second driving member 15 is preferably a screw rod, and the form of a small motor is conducive to weight reduction, thereby realizing an integrated cantilever structure.

[0040] Specifically, the second rod 5 is connected to a third driving member 16 for driving the second rod 5 to move relative to the first rod 3 along the vertical direction Z. The third driving member 16 may be a linear motor.

[0041] In this embodiment, ifFigure 1 and Figure 5 As shown, above the end of the first rod 3 connected to the cross beam 1, an electrical box 8 is fixedly provided. The electrical box 8 and the second slide rail 10 are respectively located at both ends of the first rod 3 along the second direction Y. The electrical box 8 can move together with the first rod 3, thereby optimizing the wiring and reducing the length of the wires. The electrical box 8 can supply power to the first driving member, the second driving member 15, the third driving member 16, and the fourth driving member 17 and the fifth driving member 18 described below.

[0042] As Figure 5 and Figure 6 As shown, the second mounting seat 6 is connected with a fourth driving member 17 for driving the second mounting seat 6 to rotate relative to the second rod 5 around the vertical direction Z. The fourth driving member 17 can be a rotating motor. A first opening 51 for accommodating the fourth driving member 17 is provided at the bottom of the second rod 5, thereby optimizing the spatial distribution of the grading device.

[0043] Specifically, the second mounting seat 6 includes a first connecting plate 61 and two second connecting plates 62. The two second connecting plates 62 are located at both ends of the first connecting plate 61 in the second direction Y. Two third connecting plates 72 are provided on one side of the grasping assembly 7 close to the second mounting seat 6, and the two third connecting plates 72 are respectively rotatably connected to the two second connecting plates 62.

[0044] Furthermore, the third connecting plate 72 is connected with a fifth driving member 18 for driving the third connecting plate 72 to drive the grasping assembly 7 to rotate relative to the second connecting plate 62 around the second direction Y. The fifth driving member 18 can be a rotating motor. The first connecting plate 61 and the two second connecting plates 62 form a second opening 63 for accommodating the fifth driving member 18, thereby optimizing the spatial distribution of the grading device.

[0045] In this embodiment, each driving member can be driven by a servo motor, using a gear-rack or lead screw transmission and a linear guide rail for guiding, having the advantages of accurate positioning and stable operation.

[0046] Specifically, the number of the first rods 3 is two, and the two first rods 3 are spaced apart in the first direction X. In the second direction Y, the two first rods 3 are located on the same side of the cross beam 1. Thus, the photovoltaic modules to be graded can be arranged on the same side of the two first rods 3 and between the two first rods 3. The two first rods 3 respectively correspond to two grasping assemblies 7, and the two grasping assemblies 7 can respectively grasp and grade the photovoltaic modules to be graded in the middle, improving the working efficiency and reducing the waiting time.

[0047] It should be noted that in the description of this specification, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can it be understood as indicating or implying relative importance. In addition, in the description of this specification, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0048] Any numerical values cited herein include all values from the lower value to the upper value increasing in increments of one unit therebetween, provided that there is a separation of at least two units between any lower value and any higher value. For example, if the value of the number of components or a process variable (such as temperature, pressure, time, etc.) is stated as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, it is intended to indicate that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. are also expressly recited in this specification. For values less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples of what is intended to be explicitly expressed, and it can be considered that all possible combinations of numerical values recited between the lowest value and the highest value are expressly set forth in this specification in a similar manner.

[0049] Unless otherwise specified, all ranges include the endpoints and all numbers between the endpoints. The term "about" or "approximate" used in connection with a range is applicable to both endpoints of that range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0050] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" describing a combination should include the identified elements, ingredients, components, or steps as well as other elements, ingredients, components, or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe the combinations of elements, ingredients, components, or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components, or steps. By using the term "may" herein, it is intended to indicate that any of the attributes described as "may" include are optional.

[0051] A plurality of elements, ingredients, components, or steps can be provided by a single integrated element, ingredient, component, or step. Alternatively, a single integrated element, ingredient, component, or step can be divided into separate multiple elements, ingredients, components, or steps. The disclosure of "a" or "an" used to describe an element, ingredient, component, or step does not preclude the presence of other elements, ingredients, components, or steps.

[0052] It should be understood that the above description is for illustrative purposes and not for limitation. Upon reading the above description, many embodiments and many applications other than the provided examples will be apparent to those skilled in the art. Therefore, the scope of this teaching should not be determined with reference to the above description, but rather should be determined with reference to the appended claims and the full scope of equivalents to which those claims are entitled. For the sake of completeness, all articles and references, including the disclosures of patent applications and patents, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the inventor has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A grading device for grading photovoltaic modules, characterized in that: include: A crossbeam extending along a first direction, wherein a top surface of the crossbeam is provided with a first slide rail extending along the first direction; A plurality of columns extending in a vertical direction, wherein the plurality of columns are spaced apart in the first direction; the crossbeam is fixedly connected to the top surfaces of the plurality of columns; The first direction is perpendicular to the vertical direction; A first rod extending along a second direction, wherein the second direction, the first direction and the vertical direction are perpendicular to each other; the first rod is slidably connected to the first slide rail via a first slider; a second slide rail extending along the second direction is provided on a side of the first rod perpendicular to the first direction; A first mounting seat is disposed on one side of the first slide rail and the first mounting seat is slidably connected to the second slide rail via a second sliding block; a second rod member located on a side of the first mounting seat away from the first rod member, the second rod member extending along the vertical direction and adopting a hollow structure; a third slide rail extending along the vertical direction is provided on a side of the second rod member facing the first mounting seat; the first mounting seat is slidably connected to the third slide rail via a third slider; A second mounting base rotatably connected to the bottom of the second rod; the rotation axis of the second mounting base extends along the vertical direction; A grabbing assembly is rotatably connected to the bottom of the second mounting seat, and the rotating axis of the grabbing assembly extends along the second direction; a plurality of suction cups are arranged on a side of the grabbing assembly away from the second mounting seat.

2. The grading device for grading photovoltaic modules according to claim 1, characterized in that: The crossbeam is formed by sequentially connecting three steel pipes extending along the first direction, and the shape of the steel pipe is a hollow rectangle.

3. The grading device for grading photovoltaic modules according to claim 1, characterized in that: The first rod is integrally formed.

4. The grading device for grading photovoltaic modules according to claim 1, characterized in that: The material of the second rod is aluminum.

5. The grading device for grading photovoltaic modules according to claim 1, characterized in that: The first rod is connected to a first driving member for driving the first rod to move along the first direction relative to the crossbeam; the first mounting seat is connected to a second driving member for driving the first mounting seat to move along the second direction relative to the first rod; the second driving member includes a screw rod; the second rod is connected to a third driving member for driving the second rod to move along the vertical direction relative to the first rod.

6. The grading device for grading photovoltaic modules according to claim 1, characterized in that: An electric box is fixedly provided above one end of the first rod connected to the crossbeam, and the second slide rail is located at the other end of the first rod where the electric box is provided.

7. The grading device for grading photovoltaic modules according to claim 1, characterized in that: The second mounting seat is connected to a fourth driving member for driving the second mounting seat to rotate relative to the second rod around the vertical direction; a first opening for accommodating the fourth driving member is provided at the bottom of the second rod.

8. The grading device for grading photovoltaic modules according to claim 1, characterized in that: The second mounting seat includes a first connecting plate and two second connecting plates, and the two second connecting plates are located at both ends of the first connecting plate in the second direction; two third connecting plates are provided on the side of the grabbing assembly close to the second mounting seat, and the two third connecting plates are rotatably connected to the two second connecting plates respectively.

9. The grading device for grading photovoltaic modules according to claim 8, characterized in that: The third connecting plate is connected to a fifth driving member for driving the third connecting plate to drive the grabbing assembly to rotate around the second direction relative to the second connecting plate; the first connecting plate and the two second connecting plates form a second opening for accommodating the fifth driving member.

10. The grading device for grading photovoltaic modules according to claim 1, characterized in that: The number of the first rods is two, and the two first rods are arranged at intervals in the first direction; in the second direction, the two first rods are located on the same side of the crossbeam.

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