A main frame structure for low voltage switchgear

Abstract

The utility model provides a main frame structure for low voltage complete switchgear, including the crossbeam along first horizontal direction extension, the vertical column along vertical direction extension and the vertical column along second horizontal direction extension, the crossbeam, vertical column and vertical column include the connecting flange in both ends of its extension direction, the crossbeam, vertical column and vertical column are connected with each other through the connecting flange and form the rectangular cubic frame structure, first horizontal direction is perpendicular with second horizontal direction, vertical direction is perpendicular with first horizontal direction and second horizontal direction, the crossbeam, vertical column and vertical column all include the positioning structure respectively, the positioning structure includes a plurality of locating surfaces, at the connecting node of main frame structure, the crossbeam, vertical column and vertical column are through the locating surface on it and each other abutment cooperation realizes the positioning, thereby ensure the assembly accuracy of main frame structure, make the whole structure more compact.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment manufacturing technology. More specifically, it relates to a main frame structure for low-voltage switchgear assemblies. Background Technology

[0002] In the low-voltage switchgear industry, the mainstream main frame structure currently uses C-shaped profiles for connection. However, C-shaped profiles cannot be directly connected and require indirect connections via intermediate components, resulting in a large number of parts in the main frame structure and a cumbersome assembly process. With an increased number of parts, the cumulative effect of errors becomes significant, further increasing the overall error. Furthermore, the lack of effective positioning measures between the C-shaped profiles leads to a relatively loose overall structure, affecting the final assembly accuracy. Utility Model Content

[0003] The purpose of this utility model is to provide a main frame structure for low-voltage switchgear, so as to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a main frame structure for low-voltage switchgear, comprising: It includes: a horizontal beam extending along a first horizontal direction, a longitudinal beam extending along a second horizontal direction, and a vertical column extending along a vertical direction; the horizontal beam, the column, and the longitudinal beam each have a connecting flange at both ends in their extending directions, and the horizontal beam, the column, and the longitudinal beam are connected to each other through the connecting flanges to form a rectangular cubic frame structure; the first horizontal direction is perpendicular to the second horizontal direction, and the vertical direction is perpendicular to both the first and second horizontal directions. Each of the horizontal beams, columns, and longitudinal beams includes a positioning structure, which includes multiple positioning surfaces. At the connection nodes of the main frame structure, the horizontal beams, columns, and longitudinal beams are positioned by mutual contact and cooperation through the positioning surfaces.

[0005] In a preferred embodiment, the crossbeam is provided with a first flange for connecting the column and a second flange for connecting the longitudinal beam; the column is provided with a third flange for connecting the crossbeam and a fourth flange for connecting the longitudinal beam; and the longitudinal beam is provided with a fifth flange for connecting the crossbeam and a sixth flange for connecting the column.

[0006] A preferred embodiment is that the first flange, second flange, third flange, fourth flange, fifth flange and sixth flange are respectively provided with connection holes for fixing the flanges together by fasteners.

[0007] A preferred embodiment is that the crossbeam includes a crossbeam body and a first positioning structure formed at both ends of the crossbeam body; the column includes a column body and a second positioning structure formed at both ends of the column body; the first positioning structure and the second positioning structure are in contact with each other to achieve positioning of the crossbeam and the column at the connection point.

[0008] A preferred embodiment is that the first positioning structure includes a first abutment surface, a second abutment surface, a third abutment surface, a fourth abutment surface, a fifth abutment surface, a sixth abutment surface, and a seventh abutment surface formed at the end of the beam body; The second positioning structure includes an eighth abutment surface, a ninth abutment surface, a tenth abutment surface, an eleventh abutment surface, a twelfth abutment surface, a thirteenth abutment surface, and a fourteenth abutment surface formed at the end of the column body; Among them, the first abutment surface mates with the eleventh abutment surface, the second abutment surface mates with the twelfth abutment surface, the third abutment surface mates with the eighth abutment surface, the fourth abutment surface mates with the ninth abutment surface, the sixth abutment surface mates with the tenth abutment surface, and the seventh abutment surface mates with the thirteenth abutment surface.

[0009] A preferred embodiment is that the longitudinal beam includes a longitudinal beam body and a third positioning structure formed at both ends of the longitudinal beam body; the third positioning structure contacts and cooperates with the first positioning structure and the second positioning structure to realize the positioning of the longitudinal beam, the crossbeam and the column at the connection.

[0010] A preferred embodiment is that the third positioning structure includes a fifteenth abutment surface, a sixteenth abutment surface, and a seventeenth abutment surface formed at the end of the longitudinal beam body; wherein the fifteenth abutment surface mates with the fifth abutment surface, and the sixteenth abutment surface mates with the fourteenth abutment surface.

[0011] In a preferred embodiment, the first positioning structure further includes a first pin and a first insertion hole formed at the end of the crossbeam body; the third positioning structure further includes a second pin; wherein the first pin is used to cooperate with the seventeenth abutment surface, and the second pin is used to be inserted into the first insertion hole.

[0012] In a preferred embodiment, the crossbeam includes a first flange and a second flange at both ends of its extension direction, the column includes a third flange and a fourth flange at both ends of its extension direction, and the longitudinal beam includes a fifth flange and a sixth flange at both ends of its extension direction; the first flange is used to connect with the third flange, the second flange is used to connect with the fifth flange, and the fourth flange is used to connect with the sixth flange.

[0013] In a preferred embodiment, the crossbeams, columns, and longitudinal beams are interconnected in three directions—the first horizontal direction, the second horizontal direction, and the vertical direction—through the cooperation of the connecting flanges and the positioning structure, forming an integrated load-bearing frame.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a main frame structure for low-voltage switchgear, including a crossbeam extending along a first horizontal direction, a longitudinal beam extending along a second horizontal direction, and a column extending along a vertical direction. Each of the crossbeams, columns, and longitudinal beams has a connecting flange at both ends of its extending direction, and the crossbeams, columns, and longitudinal beams are interconnected through the connecting flanges to form a rectangular cubic frame structure. The first horizontal direction is perpendicular to the second horizontal direction, and the vertical direction is perpendicular to both the first and second horizontal directions. Each crossbeam, column, and longitudinal beam includes a positioning structure, which includes multiple positioning surfaces. At the connection nodes of the main frame structure, the crossbeams, columns, and longitudinal beams are positioned by mutual abutment and cooperation through the positioning surfaces. By optimizing the structural form and connection method of the main frame, the crossbeams, longitudinal beams, and columns can be directly connected to each other, thereby eliminating intermediate components, simplifying the assembly process, and effectively reducing accumulated errors. Through structural positioning design, high precision in the relative positions of the components of the main frame is ensured, ultimately making the overall structure more compact and precise. Attached Figure Description

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of the main frame of this utility model.

[0017] Figures 2-7 This is a schematic diagram of the crossbeam structure of this utility model.

[0018] Figures 8-11 This is a structural schematic diagram of the column of this utility model.

[0019] Figures 12-17 This is a schematic diagram of the longitudinal beam of this utility model.

[0020] Figure 18 This is one of the schematic diagrams showing the combination of the crossbeam, column, and longitudinal beam of this utility model.

[0021] Figure 19 yes Figure 18 Enlarged view of point C in the middle.

[0022] Figure 20 This is the second schematic diagram showing the combination of the crossbeam, column, and longitudinal beam of this utility model.

[0023] Figure 21 yes Figure 20 Enlarged view of point D in the middle.

[0024] Figure 22 This is the third schematic diagram showing the combination of the crossbeam, column, and longitudinal beam of this utility model.

[0025] Figure 23 yes Figure 22 Enlarged view of point E in the middle.

[0026] Figure 24 This is the fourth schematic diagram showing the combination of the crossbeam, column, and longitudinal beam of this utility model.

[0027] Figure 25 yes Figure 24 Enlarged view of point F in the middle.

[0028] Figure 26 This is the fifth schematic diagram showing the combination of the crossbeam, column, and longitudinal beam of this utility model.

[0029] Figure 27 yes Figure 26 A magnified view of point G in the middle.

[0030] Figure 28 This is the sixth schematic diagram of the combination of the crossbeam, column and longitudinal beam of this utility model.

[0031] Figure 29 yes Figure 28 A magnified view of section H in the middle. Detailed Implementation

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0033] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0034] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0035] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0037] To overcome the shortcomings of existing main frame structures for low-voltage switchgear assemblies, which use C-shaped profiles and intermediate components for connection, resulting in numerous parts, cumbersome assembly, large error accumulation, loose structure, and low assembly precision, this utility model provides a high-precision, compact main frame structure for low-voltage switchgear assemblies, combining... Figures 1 to 29 As shown, the main frame structure for the low-voltage switchgear specifically includes a horizontal beam 1 extending along a first horizontal direction, a longitudinal beam 3 extending along a second horizontal direction, and a vertical column 2 extending along a vertical direction. Each of the horizontal beam 1, column 2, and longitudinal beam 3 has a connecting flange at both ends in its extending direction. The horizontal beam 1, column 2, and longitudinal beam 3 are interconnected via the connecting flanges to form a rectangular-cubic frame structure. The first horizontal direction is perpendicular to the second horizontal direction, and the vertical direction is perpendicular to both the first and second horizontal directions. Figure 1 As shown, the first horizontal direction is the X direction, the second horizontal direction is the Y direction, and the vertical direction is the Z direction.

[0038] Furthermore, each of the crossbeams 1, columns 2, and longitudinal beams 3 includes a positioning structure, which comprises multiple positioning surfaces. At the connection nodes of the main frame structure, any two of the crossbeams 1, columns 2, and longitudinal beams 3 are positioned by mutual contact and contact through the positioning surfaces. That is, at at least one combined corner of the main frame structure, the crossbeams 1, columns 2, and longitudinal beams 3 cooperate with each other through multiple positioning surfaces, constraining the relative positions of any two of the crossbeams 1, columns 2, and longitudinal beams 3 based on the connecting flange connection, thus achieving multi-dimensional spatial constraints and positioning. This utility model achieves direct connection of the crossbeams 1, columns 2, and longitudinal beams 3 by setting connecting flanges, eliminating intermediate components, simplifying assembly steps, reducing the number of parts, and thus reducing the error accumulation effect; and by setting a cooperating structure including multiple positioning surfaces, precise relative position constraints are formed in three dimensions, improving the assembly accuracy and stability of the structure, making the main frame structure more compact and precise.

[0039] In one specific embodiment, the crossbeam 1 is provided with a first flange 111 for connecting the column 2 and a second flange 121 for connecting the longitudinal beam 3. The column 2 is provided with a third flange 211 for connecting the crossbeam 1 and a fourth flange 221 for connecting the longitudinal beam 3. The longitudinal beam 3 is provided with a fifth flange 311 for connecting the crossbeam 1 and a sixth flange 321 for connecting the column 2. More specifically, the first flange 111, second flange 121, third flange 211, fourth flange 221, fifth flange 311, and sixth flange 321 are each provided with connecting holes, which are used to achieve a fixed connection between the flanges through fasteners. The fasteners can specifically be screws, which are tightened by passing through the connecting holes to achieve reliable locking between the flanges, further enhancing the vibration resistance and load-bearing capacity of the structure. The aforementioned crossbeam 1 includes a first flange 111 and a second flange 121 at both ends of its extension direction; the aforementioned column 2 includes a third flange 211 and a fourth flange 221 at both ends of its extension direction; and the aforementioned longitudinal beam 3 includes a fifth flange 311 and a sixth flange 321 at both ends of its extension direction. That is, one end of the crossbeam 1 has a first flange 111 and a second flange 121, and the other end also has a first flange 111 and a second flange 121; one end of the column 2 has a third flange 211 and a fourth flange 221, and the other end also has a third flange 211 and a fourth flange 221; one end of the longitudinal beam 3 has a fifth flange 311 and a sixth flange 321, and the other end also has a fifth flange 311 and a sixth flange 321. The first flange 111 connects to the third flange 211, the second flange 121 connects to the fifth flange 311, and the fourth flange 221 connects to the sixth flange 321, thus forming a combined angle at the connection points of the crossbeam 1, the column 2, and the longitudinal beam 3. All of the above flanges are plate-shaped structures, with connection holes penetrating the plate-shaped flange. There are two connection holes on one flange.

[0040] In one specific embodiment, the crossbeam 1 includes a crossbeam body and first positioning structures formed at both ends of the crossbeam body. The column 2 includes a column body and second positioning structures formed at both ends of the column body. The first positioning structure and the second positioning structure are in contact with each other to achieve positioning of the crossbeam 1 and the column 2 at the connection point. The first positioning structure includes a first abutment surface 131, a second abutment surface 132, a third abutment surface 141, a fourth abutment surface 142, a fifth abutment surface 133, a sixth abutment surface 143 and a seventh abutment surface 134 formed at the ends of the crossbeam body. The second positioning structure includes an eighth abutment surface 241, a ninth abutment surface 242, a tenth abutment surface 243, an eleventh abutment surface 231, a twelfth abutment surface 232, a thirteenth abutment surface 233 and a fourteenth abutment surface 234 formed at the ends of the column body. Among them, the first abutment surface 131 mates with the eleventh abutment surface 231, the second abutment surface 132 mates with the twelfth abutment surface 232, the third abutment surface 141 mates with the eighth abutment surface 241, the fourth abutment surface 142 mates with the ninth abutment surface 242, the sixth abutment surface 143 mates with the tenth abutment surface 243, and the seventh abutment surface 134 mates with the thirteenth abutment surface 233.

[0041] Furthermore, the longitudinal beam 3 includes a longitudinal beam body and third positioning structures formed at both ends of the longitudinal beam body. The third positioning structure contacts and engages with the first and second positioning structures to achieve positioning of the longitudinal beam 3 at the connection points with the crossbeam 1 and the column 2. The third positioning structure includes a fifteenth abutment surface 331, a sixteenth abutment surface 332, and a seventeenth abutment surface 333 formed at the ends of the longitudinal beam body. The fifteenth abutment surface 331 engages with the fifth abutment surface 133, and the sixteenth abutment surface 332 engages with the fourteenth abutment surface 234. The cross-sections of the aforementioned crossbeam body, column body, and longitudinal beam body are all C-shaped. Figures 2-7 As shown, Figure 3 yes Figure 2 The enlarged view at point A shows that the crossbeam body includes an integrally formed first cross plate 11, second cross plate 12, third cross plate 13, and fourth cross plate 14. The first and second cross plates 11 and 12 are flat plates, while the third and fourth cross plates 13 and 14 are L-shaped plates. The first, second, and third cross plates 11, 12, 13, and 14 form a C-shaped structure, wherein the third and fourth cross plates 13 and 14 are not connected. A first flange 111 is formed at the end of the first cross plate 11, and a second flange 121 is formed at the end of the second cross plate 12. A first abutment surface 131, a second abutment surface 132, a fifth abutment surface 133, and a seventh abutment surface 134 are formed at the end of the third cross plate 13. A third abutment surface 141, a fourth abutment surface 142, and a sixth abutment surface 143 are formed at the end of the fourth cross plate 14. Figures 22-27As shown in the figure, mark 41 corresponds to the abutment positioning position of the first abutment surface and the eleventh abutment surface; mark 42 corresponds to the abutment positioning position of the third abutment surface and the eighth abutment surface; mark 43 corresponds to the abutment positioning position of the fifth abutment surface and the fifteenth abutment surface; mark 44 corresponds to the abutment positioning position of the second abutment surface and the twelfth abutment surface; mark 45 corresponds to the abutment positioning position of the fourth abutment surface and the ninth abutment surface; mark 46 corresponds to the abutment positioning position of the sixth abutment surface and the tenth abutment surface; mark 47 corresponds to the abutment positioning position of the seventh abutment surface and the thirteenth abutment surface; and mark 48 corresponds to the abutment positioning position of the fourteenth abutment surface and the sixteenth abutment surface.

[0042] Similarly, combining Figures 8-11 As shown, the column body includes an integrally formed first upright plate 21, second upright plate 22, third upright plate 23, and fourth upright plate 24. The first upright plate 21, second upright plate 22, and fourth upright plate 24 are flat plates, while the third upright plate 23 is an L-shaped plate. The first upright plate 21, second upright plate 22, third upright plate 23, and fourth upright plate 24 form a C-shaped structure, wherein the third upright plate 23 and the fourth upright plate 24 are not connected. A third flange 211 is formed at the end of the first upright plate 21, and a fourth flange 221 is formed at the end of the second upright plate 22. An eleventh abutment surface 231, a twelfth abutment surface 232, a thirteenth abutment surface 233, and a fourteenth abutment surface 234 are formed at the end of the third upright plate 23. An eighth abutment surface 241, a ninth abutment surface 242, and a tenth abutment surface 243 are formed at the end of the fourth upright plate 24.

[0043] Similarly, combining Figures 12-17 As shown, Figure 13 yes Figure 12 The enlarged view at point B shows that the longitudinal beam body includes an integrally formed first longitudinal plate 31, second longitudinal plate 32, third longitudinal plate 33, and fourth longitudinal plate 34. The first longitudinal plate 31, second longitudinal plate 32, and third longitudinal plate 33 are flat plates, while the fourth longitudinal plate 34 is an L-shaped plate. The first longitudinal plate 31, second longitudinal plate 32, third longitudinal plate 33, and fourth longitudinal plate 34 form a C-shaped structure, wherein the third longitudinal plate 33 and the fourth longitudinal plate 34 are not connected. A fifth flange 311 is formed at the end of the first longitudinal plate 31, and a sixth flange 321 is formed at the end of the second longitudinal plate 32. A fifteenth abutment surface 331, a sixteenth abutment surface 332, and a seventeenth abutment surface 333 are formed at the end of the third longitudinal plate 33.

[0044] Furthermore, the first positioning structure also includes a first pin 135 and a first insertion hole 136 formed at the end of the crossbeam body. The third positioning structure also includes a second pin 341. The first pin 135 and the first insertion hole 136 are both formed on the third horizontal plate 13. The second pin 341 is formed at the end of the fourth vertical plate 34. The first pin 135 is used to correspond with the seventeenth abutment surface 333, and the second pin 341 is used to insert into the first insertion hole 136. Through the corresponding engagement of the first pin 135 with the seventeenth abutment surface 333 and the insertion engagement of the second pin 341 with the first insertion hole 136, the relative displacement between the crossbeam body and the vertical beam body can be effectively limited, improving the stability and positioning accuracy of the structural connection. The insertion structure is simple, reliable, and easy to assemble. The first pin 135 can be inserted along the first horizontal direction into the space enclosed by the seventeenth abutment surface 333, the inner wall of the fifth flange 311, and the inner wall of the sixth flange 321 to form an insertion positioning. The second pin 341 can be inserted into the first socket 136 along the second horizontal direction to form a plug-in positioning.

[0045] The main frame structure includes four horizontal beams 1, four vertical columns 2, and four longitudinal beams 3. This main frame structure consists of 12 structural components along three dimensions: width (X-direction), height (Z-direction), and depth (Y-direction). Specifically, it includes four horizontal beams 1 in the width direction, four vertical columns 2 in the height direction, and four longitudinal beams 3 in the depth direction. The horizontal beams 1 are equipped with a first flange 111 for connecting to the vertical columns 2 and a second flange 121 for connecting to the longitudinal beams 3. The first flange 111 has a first connecting hole 1111, and the second flange 121 has a second connecting hole 1211. The vertical columns 2 are equipped with a third flange 211 for connecting to the horizontal beams 1 and a fourth flange 221 for connecting to the longitudinal beams 3. The third flange 211 has a third connecting hole 2111, and the fourth flange 221 has a fourth connecting hole 2211. The longitudinal beam 3 is provided with a fifth flange 311 for connecting to the crossbeam 1 and a sixth flange 321 for connecting to the column 2. The fifth flange 311 has a fifth connecting hole 3111, and the sixth flange 321 has a sixth connecting hole 3211. The crossbeam 1, column 2, and longitudinal beam 3 are interconnected in three directions—first horizontal, second horizontal, and vertical—through the cooperation of the connecting flanges and the positioning structure, forming an integrated load-bearing frame. In a specific assembly embodiment of this utility model, combined with… Figures 18 to 29As shown, the assembly process is illustrated using a combined corner of the main frame structure as an example. First, the first flange 111 of the crossbeam 1 and the third flange 211 of the column 2 are connected with screws through the first connecting hole 1111 and the third connecting hole 2111. The second flange 121 of the crossbeam 1 and the fifth flange 311 of the longitudinal beam 3 are connected with screws through the second connecting hole 1211 and the fifth connecting hole 3111. The fourth flange 221 of the column 2 and the sixth flange 321 of the longitudinal beam 3 are connected with screws through the fourth connecting hole 2211 and the sixth connecting hole 3211. During the connection process, the first abutment surface 131 on the crossbeam 1 abuts against the eleventh abutment surface 231 on the column 2 to form surface contact positioning; the second abutment surface 132 abuts against the twelfth abutment surface 232 to form surface contact positioning; the third abutment surface 141 abuts against the eighth abutment surface 241 to form surface contact positioning; and the fourth abutment surface 142 abuts against the ninth abutment surface 242 to form surface contact positioning. Simultaneously, the fifth abutment surface 133 on the crossbeam 1 abuts against the fifteenth abutment surface 331 on the longitudinal beam 3 to form surface contact positioning; the sixth abutment surface 143 abuts against the tenth abutment surface 243 on the column 2 to form surface contact positioning; and the seventh abutment surface 134 abuts against the thirteenth abutment surface 233 on the column 2 to form surface contact positioning. The fourteenth abutment surface 234 on the column 2 abuts against the sixteenth abutment surface 332 on the longitudinal beam 3 to form surface contact positioning. Furthermore, the first pin 135 on the crossbeam 1 is inserted into the space enclosed by the seventeenth abutment surface 333 of the longitudinal beam 3, the inner wall of the fifth flange 311, and the inner wall of the sixth flange 321 to form insertion positioning; and the second pin 341 on the longitudinal beam 3 is inserted into the first insertion hole 136 of the crossbeam 1 to form insertion positioning. It is understood that the location and number of the aforementioned abutment surfaces can be adjusted according to actual structural needs, and the fit between the abutment surfaces ensures the precise positioning of the main frame structure in three dimensions. The fit between the pin and the socket further enhances the rigidity of the connection node, preventing relative displacement of the structure under stress. The connecting flange and the profile body adopt an integral molding structure, avoiding the impact of welding deformation on precision. Each mating surface is formed simultaneously during the extrusion process of the profile body, reducing subsequent machining steps and improving production efficiency.

[0046] In summary, this utility model provides a main frame structure for low-voltage switchgear, including a crossbeam extending along a first horizontal direction, a longitudinal beam extending along a second horizontal direction, and a column extending along a vertical direction. Each of the crossbeams, columns, and longitudinal beams has a connecting flange at both ends of its extension direction, and the crossbeams, columns, and longitudinal beams are interconnected through the connecting flanges to form a rectangular cubic frame structure. The first horizontal direction is perpendicular to the second horizontal direction, and the vertical direction is perpendicular to both the first and second horizontal directions. Each crossbeam, column, and longitudinal beam includes a positioning structure, which includes multiple positioning surfaces. At the connection nodes of the main frame structure, the crossbeams, columns, and longitudinal beams are positioned by mutual abutment and cooperation through the positioning surfaces. By optimizing the structural form and connection method of the main frame, the crossbeams, longitudinal beams, and columns can be directly connected to each other, thereby eliminating intermediate components, simplifying the assembly process, and effectively reducing accumulated errors. Through structural positioning design, high precision in the relative positions of the components of the main frame is ensured, ultimately making the overall structure more compact and precise.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A main frame structure for low-voltage switchgear assemblies, characterized in that, include: A horizontal beam extending along a first horizontal direction, a longitudinal beam extending along a second horizontal direction, and a vertical column extending along a vertical direction; each of the horizontal beam, column, and longitudinal beam has a connecting flange at both ends in its extending direction, and the horizontal beam, column, and longitudinal beam are connected to each other through the connecting flange to form a rectangular cubic frame structure; the first horizontal direction is perpendicular to the second horizontal direction, and the vertical direction is perpendicular to both the first and second horizontal directions. Each of the horizontal beams, columns, and longitudinal beams includes a positioning structure, which includes multiple positioning surfaces. At the connection nodes of the main frame structure, the horizontal beams, columns, and longitudinal beams are positioned by mutual contact and cooperation through the positioning surfaces.

2. The main frame structure according to claim 1, characterized in that, The crossbeam is provided with a first flange for connecting the column and a second flange for connecting the longitudinal beam. The column is provided with a third flange for connecting the crossbeam and a fourth flange for connecting the longitudinal beam. The longitudinal beam is provided with a fifth flange for connecting the crossbeam and a sixth flange for connecting the column.

3. The main frame structure according to claim 2, characterized in that, The first flange, second flange, third flange, fourth flange, fifth flange and sixth flange are respectively provided with connection holes for fixing the flanges together by fasteners.

4. The main frame structure according to claim 1, characterized in that, The crossbeam includes a crossbeam body and a first positioning structure formed at both ends of the crossbeam body; the column includes a column body and a second positioning structure formed at both ends of the column body; the first positioning structure and the second positioning structure are in contact with each other to achieve positioning of the crossbeam and the column at the connection point.

5. The main frame structure according to claim 4, characterized in that, The first positioning structure includes a first abutting surface, a second abutting surface, a third abutting surface, a fourth abutting surface, a fifth abutting surface, a sixth abutting surface, and a seventh abutting surface formed at the end of the beam body; The second positioning structure includes an eighth abutment surface, a ninth abutment surface, a tenth abutment surface, an eleventh abutment surface, a twelfth abutment surface, a thirteenth abutment surface, and a fourteenth abutment surface formed at the end of the column body; Among them, the first abutment surface mates with the eleventh abutment surface, the second abutment surface mates with the twelfth abutment surface, the third abutment surface mates with the eighth abutment surface, the fourth abutment surface mates with the ninth abutment surface, the sixth abutment surface mates with the tenth abutment surface, and the seventh abutment surface mates with the thirteenth abutment surface.

6. The main frame structure according to claim 5, characterized in that, The longitudinal beam includes a longitudinal beam body and a third positioning structure formed at both ends of the longitudinal beam body; the third positioning structure contacts and cooperates with the first positioning structure and the second positioning structure to realize the positioning of the longitudinal beam, the crossbeam and the column at the connection.

7. The main frame structure according to claim 6, characterized in that, The third positioning structure includes a fifteenth abutment surface, a sixteenth abutment surface, and a seventeenth abutment surface formed at the end of the longitudinal beam body; wherein the fifteenth abutment surface mates with the fifth abutment surface, and the sixteenth abutment surface mates with the fourteenth abutment surface.

8. The main frame structure according to claim 7, characterized in that, The first positioning structure further includes a first pin and a first insertion hole formed at the end of the crossbeam body; the third positioning structure further includes a second pin; wherein, the first pin is used to cooperate with the seventeenth abutment surface, and the second pin is used to be inserted into the first insertion hole.

9. The main frame structure according to claim 3, characterized in that, The crossbeam includes a first flange and a second flange at both ends of its extension direction, the column includes a third flange and a fourth flange at both ends of its extension direction, and the longitudinal beam includes a fifth flange and a sixth flange at both ends of its extension direction; the first flange is used to connect with the third flange, the second flange is used to connect with the fifth flange, and the fourth flange is used to connect with the sixth flange.

10. The main frame structure according to claim 1, characterized in that, The crossbeams, columns, and longitudinal beams are interconnected in three directions—first horizontal, second horizontal, and vertical—through the cooperation of the connecting flanges and the positioning structure, forming an integrated load-bearing frame.

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