A pull-out box structure

Abstract

The present invention relates to a pull-out box structure, which comprises a box body with at least one opening at the bottom. At the opening, two guide rails are symmetrically and fixedly arranged. The two guide rails have two track grooves with their notches facing each other. At one end inside the two track grooves, first extrusion blocks are symmetrically and fixedly arranged. A pull-out bottom plate is slidably arranged between the two track grooves. On both sides of the first end of the pull-out bottom plate, second extrusion blocks are arranged to cooperate with the first extrusion blocks, and the second extrusion blocks can be extruded and abutted against the first extrusion blocks. A fixing plate is fixedly arranged at the second end of the pull-out bottom plate. The two ends of the fixing plate along the width direction of the pull-out bottom plate extend out of both sides of the pull-out bottom plate and can be detachably and fixedly connected to the side surface of the box body through first fasteners. The pull-out box structure of the present invention can facilitate the assembly of the box structure and the maintenance and replacement of the electrical components inside the box, with less workload and time saving.

Description

Technical Field

[0001] The present invention relates to the field of rail transit, and particularly to a pull-out box structure. Background Art

[0002] The box installed at the bottom of a rail transit vehicle has at least one opening at its bottom. After the electrical components in the box are installed, currently, a bolted bottom plate structure is mainly used to seal the opening by means of bolt fixation. The existing bolted bottom plate structure is a mounting plate with bent edges on four sides. Each bent edge is fixed to the bottom of the box by a plurality of M6 bolts. By fixing the bolts, the connection between this structure and the bottom of the box and the sealing performance of the box are ensured, so as to achieve the required IP rating of the box.

[0003] The number of fixing bolts required for each existing bolted bottom plate structure is 25 - 39. Generally, each box bottom has 3 openings and 3 bolted bottom plate structures need to be equipped. The total number of fixing bolts required for the entire box is approximately 100. This has the following problems: First, during the preliminary assembly of the box, each box needs to assemble about 100 bolts, with a relatively large workload and long time consumption; second, during subsequent vehicle maintenance inspections and the disassembly and assembly of the bolted bottom plate structure for the replacement of box internal components, the workload and time for maintenance inspections and the replacement of box internal components will be further increased.

[0004] Therefore, based on years of experience and practice in the relevant industry, the inventor of the present invention proposes a pull-out box structure to overcome the defects of the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a pull-out box structure that can facilitate the assembly of the box structure and the maintenance and replacement of electrical components inside the box, with a small workload and time savings.

[0006] The purpose of the present invention is achieved as follows. A pull-out box structure includes a box with at least one opening at its bottom; two guide rails are symmetrically fixed at the opening. The two guide rails have two track grooves with their notch openings facing each other. At one end inside the two track grooves, first extrusion blocks are symmetrically fixed; a pull-out bottom plate is slidably arranged between the two track grooves. Second extrusion blocks are arranged on both sides of the first end of the pull-out bottom plate and are adapted to cooperate with the first extrusion blocks. The second extrusion blocks can be extruded and abutted against the first extrusion blocks; a fixing plate is fixed at the second end of the pull-out bottom plate. The two ends of the fixing plate extending out of both sides of the pull-out bottom plate along the width direction of the pull-out bottom plate can be detachably fixed to the side surface of the box through first fasteners.

[0007] In a preferred embodiment of the present invention, at least two guide rail mounting plates are arranged in parallel and at intervals at the bottom of the box body. The two ends of the guide rail mounting plates are respectively fixedly connected to two opposite side plates in the box body, and the area between two adjacent guide rail mounting plates forms an opening. The guide rails are fixedly arranged on the corresponding guide rail mounting plates.

[0008] In a preferred embodiment of the present invention, the first extrusion block is a first inclined block with a first inclined surface, and the second extrusion block is a second inclined block with a second inclined surface. The second inclined surface can abut and press against the corresponding first inclined surface.

[0009] In a preferred embodiment of the present invention, each guide rail is a channel steel; the flange plate of the guide rail close to the top surface of the box body is denoted as the first flange plate, and the other flange plate of the guide rail is denoted as the second flange plate; the first inclined block is fixedly arranged on the first flange plate, and a preset gap is left between the first inclined block and the second flange plate, and the first inclined surface is arranged facing away from the first flange plate.

[0010] In a preferred embodiment of the present invention, each guide rail mounting plate is a channel steel with the notch facing the top surface of the box body, and the web of the guide rail is fixedly arranged on the flange plate of the corresponding guide rail mounting plate.

[0011] In a preferred embodiment of the present invention, extension plates are arranged at the outer wall of one of the side plates of the box body and at positions corresponding to each guide rail mounting plate. The extension plate has a connecting plate arranged parallel to the side plate of the box body, and the end of the fixing plate can be detachably fixedly connected to the corresponding connecting plate through a first fastener.

[0012] In a preferred embodiment of the present invention, the extension plate is a channel steel with the notch facing the top surface of the box body. One of the flange plates of the extension plate is connected to the side plate, and the other flange plate forms the connecting plate.

[0013] In a preferred embodiment of the present invention, one of the flange plates of the extension plate is detachably fixedly connected to the side plate through a second fastener.

[0014] In a preferred embodiment of the present invention, the fixing plate is an L-shaped plate body. The plate surface of the first plate body of the L-shaped plate body is perpendicular to the plate surface of the pull-out bottom plate and is fixedly connected to the second end of the pull-out bottom plate. The two ends of the first plate body along the width direction of the pull-out bottom plate extend out of both sides of the pull-out bottom plate and are connected to the corresponding connecting plate through a first fastener. A handle is fixedly arranged on the second plate body of the L-shaped plate body.

[0015] In a preferred embodiment of the present invention, rubber strips are arranged along the length direction of the guide rail at the bottom of each track groove.

[0016] In a preferred embodiment of the present invention, notches penetrating through the first end of the drawer bottom plate are symmetrically formed on both sides of the first end of the drawer bottom plate. Flap plates extending towards the top surface of the box body are formed on both sides of the drawer bottom plate and at the notches. The second inclined block is arranged at the notch and connected to the flap plate at the notch.

[0017] In a preferred embodiment of the present invention, the second inclined block is detachably and fixedly connected to the flap plate at the notch through a third fastener.

[0018] In a preferred embodiment of the present invention, recessed portions are symmetrically arranged on both sides of the outer surface of the drawer bottom plate facing the outside of the box body. The surface of the second inclined block facing away from the second inclined surface is flush with the recessed portions; the recessed portions are slidably inserted into the corresponding track grooves, and the outer surface of the drawer bottom plate can be flush with the outer surface of the guide rail facing the outside of the box body.

[0019] In a preferred embodiment of the present invention, a shielding plate is fixedly arranged at the first end of the drawer bottom plate, and the shielding plate can extend out of the outside of one end of the guide rail.

[0020] As described above, the drawer-type box body structure in the present invention is mainly used to be installed at the bottom of a moving vehicle. After the electrical components in the box body are installed, the drawer bottom plate slides in the track groove, and by means of the mutual extrusion between the first extrusion block and the second extrusion block, a pre-tightening force is generated, and through the connection and fixation between the fixing plate and the side surface of the box body, the drawer bottom plate and the box body are fixed together and the opening is sealed. Compared with the bolt bottom plate structure in the prior art, which has the problems of large disassembly and assembly workload and long time consumption, the box body structure in the present invention realizes that there is no bolt structure at the bottom of the box body, and only a small number of first fasteners (such as bolts) exist on the side surface of the box body. It is not only convenient for installation and disassembly, has a simple process and a small number of bolts, but also greatly reduces the workload and time required for assembling the box body structure, as well as for later maintenance inspection and replacement of the components inside the box, and reduces the labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention.

[0022] Wherein:

[0023] Figure 1 : is a schematic structural diagram of the drawer-type box body structure provided by the present invention.

[0024] Figure 2 : is Figure 1 a partial enlarged view of A in

[0025] Figure 3 : is Figure 1 a partial enlarged view of B in

[0026] Figure 4: Schematic diagram of the structure of the draw-out bottom plate provided by the present invention in cooperation with the second inclined block, fixed plate and baffle plate.

[0027] Figure 5 : is Figure 4 Partial enlarged view at position C in

[0028] Figure 6 : Schematic diagram of the structure of the draw-out box structure provided by the present invention after the draw-out bottom plate is fixed to the box body.

[0029] Explanation of reference numerals in the drawings:

[0030] 1. Box body; 11. Opening; 12. Side plate;

[0031] 2. Guide rail mounting plate;

[0032] 3. Guide rail; 31. Track groove; 32. First flange plate; 33. Second flange plate;

[0033] 4. First extrusion block; 41. First inclined block; 411. First inclined surface;

[0034] 5. Extension plate; 51. Connecting plate;

[0035] 6. Draw-out bottom plate; 61. Folding plate; 62. Concave part;

[0036] 7. Second extrusion block; 71. Second inclined block; 711. Second inclined surface;

[0037] 8. Fixed plate; 81. First plate body; 82. Second plate body; 83. Handle;

[0038] 9. Baffle plate. Detailed implementation manners

[0039] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0040] As Figures 1 to 6 shown, this embodiment provides a draw-out box structure, including a box body 1 with at least one opening 11 at the bottom. At the opening 11, two guide rails 3 are symmetrically fixed. The two guide rails 3 have two track grooves 31 with opposite slot openings. At one end inside the two track grooves 31, first extrusion blocks 4 are symmetrically fixed. A draw-out bottom plate 6 is slidably arranged between the two track grooves 31. On both sides of the first end of the draw-out bottom plate 6, there are second extrusion blocks 7 that cooperate with the first extrusion blocks 4, and the second extrusion blocks 7 can be extruded and abutted against the first extrusion blocks 4. A fixed plate 8 is fixed to the second end of the draw-out bottom plate 6. The two ends of the fixed plate 8 along the width direction of the draw-out bottom plate 6 extend out of both sides of the draw-out bottom plate 6 and can be detachably fixedly connected to the side surface of the box body 1 through first fasteners.

[0041] It can be understood that the length direction of the drawer bottom plate 6 extends along the length direction of the guide rail 3, and the length direction of the fixed plate 8 is set along the width direction of the drawer bottom plate 6. Figure 1 and Figure 6 The number of openings 11 at the bottom of the box body 1 is determined according to actual needs, for example Figure 1 The box body 1 shown in FIG has a total opening 11. In actual use, the box body 1 will be installed at the bottom of a rail transit vehicle, and the opening 11 at the bottom of the box body 1 is placed downward.

[0042] After the box body 1 is installed, electrical components will be installed inside the box body 1. After the electrical components are installed, the first end of the pull-out bottom plate 6 is extended from the other end of the track groove 31 and slid and pushed into one end of the track groove 31. When the first end of the pull-out bottom plate 6 slides to the end of the track groove 31, the second extrusion block 7 squeezes and rests on the first extrusion block 4. The first end of the pull-out bottom plate 6 and the box body 1 can be fixed by the extrusion fixation between the second extrusion block 7 and the first extrusion block 4. Then, the fixing plate 8 is fixed to the side of the box body 1 by the first fastener to fix the second end of the pull-out bottom plate 6 and the box body 1, thereby achieving the overall mutual fixation. When it is necessary to repair or replace the components inside the box, the first fastener is removed and the pull-out bottom plate 6 is pulled out. It is simple and convenient.

[0043] Therefore, the pull-out box structure in this embodiment is mainly used for installation on the bottom of a motor vehicle. After the electrical components in the box body 1 are installed, the bottom plate 6 is pulled out to slide in the track groove 31, and the mutual squeezing effect between the first extrusion block 4 and the second extrusion block 7 is utilized to generate a pre-tightening force, and the bottom plate 6 is fixed to the side of the box body 1 through the connection of the fixing plate 8, so as to fix the pull-out bottom plate 6 and the box body 1 together and seal the opening 11. Compared with the bolt bottom plate structure in the prior art, which has the problems of large disassembly workload and long time, the box structure in this embodiment realizes a bolt-free structure at the bottom of the box body 1, and only a small number of first fasteners (such as bolts) are present on the side of the box body 1. It is not only convenient to install and disassemble, simple in process, and with a small number of bolts, but also greatly reduces the workload and time required for assembly of the box structure and subsequent maintenance inspection and replacement of components in the box, thereby reducing labor intensity.

[0044] In a specific implementation, in order to facilitate the installation of each guide rail 3, as shown in FIG. Figure 1 As shown, at least two guide rail mounting plates 2 are provided in parallel and spaced apart at the bottom of the box body 1, and the two ends of the guide rail mounting plates 2 are respectively fixedly connected to the two opposite side plates 12 in the box body 1, and the area between the two adjacent guide rail mounting plates 2 forms an opening 11, and the guide rail 3 is fixedly provided on the corresponding guide rail mounting plates 2.

[0045] ReferenceFigure 2 and Figure 5 The first pressing block 4 is preferably a first inclined block 41 with a first inclined surface 411, and the second pressing block 7 is preferably a second inclined block 71 with a second inclined surface 711. The second inclined surface 711 can be abutted and pressed against the corresponding first inclined surface 411. When the first end of the draw-out bottom plate 6 slides to the end of the track groove 31, the second inclined surface 711 of the second inclined block 71 abuts and presses against the corresponding first inclined surface 411. Through the mutual extrusion between the second inclined block 71 and the first inclined block 41, the pressing and fixing between the first end of the draw-out bottom plate 6 and the box body 1 can be realized mainly by using the pre-tightening friction force between the second inclined surface 711 and the first inclined surface 411, which is simple and convenient. Of course, the first pressing block 4 and the second pressing block 7 can also adopt other wedge block structures as long as the two can realize pressing and fixing.

[0046] The above-mentioned guide rail 3 is mainly used to position the drawing direction of the draw-out bottom plate 6. As Figure 2 shown, generally each guide rail 3 is a channel steel. The flange plate of the guide rail 3 close to the top surface of the box body 1 is denoted as the first flange plate 32, and the other flange plate of the guide rail 3 is denoted as the second flange plate 33. The first inclined block 41 is fixedly arranged on the first flange plate 32, and a preset gap is left between the first inclined block 41 and the second flange plate 33, and the first inclined surface 411 is arranged facing away from the first flange plate 32.

[0047] It can be understood that the second inclined surface 711 of the second inclined block 71 is arranged facing the first flange plate 32, and the second inclined surface 711 is inclined in the direction that the thickness of the second inclined block 71 gradually decreases from the second end to the first end of the draw-out bottom plate 6. The inclination direction of the first inclined surface 411 cooperates with the second inclined surface 711. When the draw-out bottom plate 6 slides and is pushed into one end of the track groove 31, the end of the second inclined block 71 close to the first end of the draw-out bottom plate 6 will slightly protrude from the first inclined surface 411 through the above-mentioned preset gap, so that the second inclined surface 711 and the first inclined surface 411 are mutually extruded and there is a pre-tightening friction force, preventing the draw-out bottom plate 6 from shaking in the length direction of the guide rail 3 or in the up and down direction between the first flange plate 32 and the second flange plate 33 of the guide rail 3, and ensuring the extrusion and fixing effect between the two. In addition, the guide rail 3 is a channel steel with a C-shaped structure, which can also play a role in preventing the draw-out bottom plate 6 from coming off.

[0048] Preferably, each guide rail mounting plate 2 is a channel steel with the notch facing the top surface of the box body 1, and the web of the guide rail 3 is fixedly arranged on the flange plate of the corresponding guide rail mounting plate 2.

[0049] For the case where the bottom of the box body 1 has multiple openings 11, the guide rail mounting plate 2 is made of channel steel. One flange plate of the guide rail mounting plate 2 can be used to mount the guide rail 3 in one of the openings 11, and the other flange plate of the guide rail mounting plate 2 can be used to mount the guide rail 3 in another adjacent opening 11, with stronger versatility and more convenient installation. Of course, according to needs, the guide rail mounting plate 2 can also adopt other structural forms as long as it is convenient for mounting the guide rail 3. This embodiment is only for illustration.

[0050] In practical applications, the sizes of the box bodies 1 installed at the bottom of rail transit vehicles are not exactly the same. In order to facilitate the design of the sizes of the draw-out bottom plates 6 required for each box body 1 to be the same, which is more convenient for processing and installation. As Figure 1 、 Figure 3 and Figure 6 shown, extension plates 5 are provided on the outer wall of one of the side plates 12 of the box body 1 (i.e., the side plate 12 close to the fixed plate 8) and at positions corresponding to the respective guide rail mounting plates 2. The extension plates 5 have connecting plates 51 arranged parallel to the side plates 12 of the box body 1. The end of the fixed plate 8 can be detachably fixedly connected to the corresponding connecting plate 51 through a first fastener. In this way, the sizes of the extension plates 5 can be designed accordingly according to the sizes of different box bodies 1, so that all the draw-out bottom plates 6 can be made in standard sizes and can be applicable to all the sizes of the box bodies 1, and can be cooperatively mounted and fixed with the extension plates 5, with stronger versatility.

[0051] Generally, the extension plate 5 is a channel steel with the notch facing the top surface of the box body 1. One flange plate of the extension plate 5 is connected to the side plate 12, and the other flange plate constitutes the connecting plate 51.

[0052] Since the extension plate 5 is installed on the outer wall of the box body 1 and is a protruding small component, if the extension plate 5 is welded and fixed to the box body 1, when installing electrical components in the box body 1, the operator is very likely to accidentally touch the extension plate 5 during the operation process, causing deformation of the extension plate 5 and affecting the use. Therefore, in order to avoid deformation of the extension plate 5, one flange plate of the extension plate 5 is detachably fixedly connected to the side plate 12 through a second fastener. In this way, after the installation of the electrical components in the box is completed, the extension plate 5 can be installed on the box body 1 through the second fastener (such as a bolt), and then the draw-out bottom plate 6 is slid and fixed to the box body 1.

[0053] Refer to Figure 4, for the convenience of installing and connecting the fixing plate 8, the fixing plate 8 is an L-shaped plate body. The plate surface of the first plate body 81 of the L-shaped plate body is perpendicular to the plate surface of the pull-out bottom plate 6 and is fixedly connected to the second end of the pull-out bottom plate 6. Moreover, both ends of the first plate body 81 in the width direction of the pull-out bottom plate 6 extend out of both sides of the pull-out bottom plate 6 and are connected to the corresponding connecting plates 51 through first fasteners (in this embodiment, both ends of the first plate body 81 can be fixed to the corresponding connecting plates 51 respectively through a bolt). A handle 83 is fixedly provided on the second plate body 82 of the L-shaped plate body. The setting of this handle 83 can facilitate the operator to control the free sliding of the pull-out bottom plate 6 in the track groove 31. The shape and number of the handle 83 can be in accordance with Figure 4 As shown, there are two handle 83s in the form of rectangular plate bodies, and other shapes and numbers can also be adopted according to needs.

[0054] Preferably, rubber strips are provided along the length direction of the guide rail 3 at the bottom of each track groove 31, that is, rubber strips are fixedly provided on the inner side of the web of the guide rail 3 to ensure the sealing performance between the pull-out bottom plate 6 and the box body 1. Generally, lubricating oil is applied to the rubber strips and the side parts of the pull-out bottom plate 6 during use to ensure the smooth sliding of the pull-out bottom plate 6.

[0055] Furthermore, for the convenience of installing the above-mentioned second inclined block 71, as Figure 4 and Figure 5 shown, symmetric notches penetrating the first end of the pull-out bottom plate 6 are opened on both sides of the first end of the pull-out bottom plate 6. Folding plates 61 extending towards the top surface of the box body 1 are formed on both sides and at the notches of the pull-out bottom plate 6. The second inclined block 71 is arranged at the notch and is connected to the folding plate 61 at the notch.

[0056] It can be understood that the outer side surface of the second inclined block 71 should be flush with the side edge of the pull-out bottom plate 6. During use, both sides of the pull-out bottom plate 6, the folding plates 61 on both sides and the second inclined block 71 can all slide in the track groove 31.

[0057] For the above-mentioned box body 1, guide rail mounting plate 2, guide rail 3, extension plate 5, first inclined block 41, and second inclined block 71, the materials are all preferably made of steel. The guide rail mounting plate 2 is fixedly welded to the box body 1, the guide rail 3 is fixedly welded to the corresponding guide rail mounting plate 2, and the first inclined block 41 is fixedly welded to the guide rail 3; in order to make the entire box body structure lightweight, the materials of the pull-out bottom plate 6, folding plate 61, fixing plate 8, and handle 83 are all preferably made of aluminum. The pull-out bottom plate 6 is fixedly welded to the folding plate 61, and the entire pull-out bottom plate 6 is specifically formed by welding aluminum plates. The fixing plate 8 is fixedly welded to the pull-out bottom plate 6, and the handle 83 is fixedly welded to the fixing plate 8. Since the material of the second inclined block 71 is different from that of the folding plate 61, generally, the second inclined block 71 is detachably fixedly connected to the folding plate 61 at the notch through a third fastener (such as a bolt).

[0058] Furthermore, on both sides of the outer surface of the draw-out bottom plate 6 facing the outside of the box body 1, recessed portions 62 are symmetrically provided. The surface of the second inclined block 71 facing away from the second inclined surface 711 is flush with the recessed portion 62. The recessed portion 62 is slidably inserted into the corresponding track groove 31, and the outer surface of the draw-out bottom plate 6 can be flush with the outer surface of the guide rail 3 facing the outside of the box body 1 (i.e., the outer surface of the second flange plate 33). So that after the draw-out bottom plate 6 is fixed to the box body 1, the outer surface of the draw-out bottom plate 6 and the outer surfaces of the respective guide rails 3 are on the same plane, which is more beautiful.

[0059] Refer to Figure 4 and Figure 6 , generally, a shielding plate 9 is fixedly provided at the first end of the draw-out bottom plate 6, and the shielding plate 9 can extend out of the outer side of one end of the guide rail 3. The two ends of the shielding plate 9 can be flush with the outer side surfaces of the second inclined blocks 71 on both sides. At this time, the two ends of the shielding plate 9 will also slide in the track groove 31 together and extend out of the outer side of the guide rail 3 after passing through the above-mentioned preset gap; the two ends of the shielding plate 9 can also be flush with the inner side surfaces of the second inclined blocks 71. When the second inclined block 71 and the first inclined block 41 are pressed and fixed to each other, the shielding plate 9 is pushed out of the outer side of the guide rail 3. The specific length of the shielding plate 9 is determined according to needs, and this embodiment is only for illustration. Since other structures will be installed on the side of the box body 1 by bolts, the shielding plate 9 can block the bolts for installing other components on the side of the box body 1 after extending out of the guide rail 3, avoiding the exposure of the bolts and preventing damage during the train operation, playing a certain protective role.

[0060] In summary, the draw-out box body structure in this embodiment is mainly used to be installed under the motor vehicle. The electrical components inside the box body 1 are installed, disassembled, and the sealing of the box body 1 is carried out through the draw-out structure at the bottom. The draw-out bottom plate 6 can slide freely in the guide rail 3. Through the pressing action between the first inclined block 41 and the second inclined block 71 and the connection between the fixing plate 8 and the connecting plate 51, the draw-out bottom plate 6 can be effectively fixed to the box body 1. The setting of the rubber strip can ensure the sealing performance of the box body 1. The entire box body structure is fixed by the pressing and fixing method of the cooperation between the first inclined block 41 and the second inclined block 71. Without a large number of bolts connected around, it replaces the large number of bolt fixing methods in the bolt bottom plate structure of the prior art, greatly reducing the workload and assembly time, and improving the work efficiency; the bottom of the entire box body structure is a bolt-free structure, reducing the time for regular maintenance and inspection of the vehicle, and avoiding the loosening and falling off of the bottom fixing bolts; the draw-out bottom plate 6 slides freely in the C-shaped guide rail 3, and the C-shaped structure plays an anti-disconnection role, effectively improving the reliability of the draw-out structure. The installation and disassembly of the entire box body structure are simple and convenient, and the operation can be carried out quickly, which is easy for the inspection and replacement of the electrical components inside the box.

[0061] The above are only illustrative specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A pull-out box structure, characterized in that, A box body with at least one opening at the bottom; At the opening, two guide rails are symmetrically and fixedly arranged. The two guide rails have two track grooves with their notches facing each other. At one end inside the two track grooves, first extrusion blocks are symmetrically and fixedly arranged. A pull-out bottom plate is slidably arranged between the two track grooves. On both sides of the first end of the pull-out bottom plate, second extrusion blocks are arranged to cooperate with the first extrusion blocks, and the second extrusion blocks can be extruded and abutted against the first extrusion blocks; A fixing plate is fixedly arranged at the second end of the pull-out bottom plate. The two ends of the fixing plate in the width direction of the pull-out bottom plate extend out of both sides of the pull-out bottom plate and can be detachably fixedly connected to the side surface of the box body through first fasteners. At least two guide rail mounting plates are arranged in parallel and at intervals at the bottom of the box body. The two ends of the guide rail mounting plate are respectively fixedly connected to two opposite side plates in the box body. The area between two adjacent guide rail mounting plates forms an opening, and the guide rail is fixedly arranged on the corresponding guide rail mounting plate; Each of the guide rails is a channel steel; each of the guide rail mounting plates is a channel steel with its notch facing the top surface of the box body. The web of the guide rail is fixedly arranged on the flange plate of the corresponding guide rail mounting plate. When the number of the openings is multiple, one flange plate of the guide rail mounting plate is used to mount the guide rail in one of the openings, and the other flange plate of the guide rail mounting plate is used to mount the guide rail in another adjacent opening; Extension plates are arranged on the outer wall of one of the side plates of the box body and at positions corresponding to each of the guide rail mounting plates. The extension plates have connecting plates arranged parallel to the side plates of the box body. The end of the fixing plate can be detachably fixedly connected to the corresponding connecting plate through the first fasteners. Depressions are symmetrically arranged on both sides of the outer surface of the pull-out bottom plate facing the outside of the box body. The depressions can be slidably inserted into the corresponding track grooves, and the outer surface of the pull-out bottom plate can be flush with the outer surface of the guide rail facing the outside of the box body.

2. The pull-out box body structure according to claim 1, characterized in that The first extrusion block is a first inclined block with a first inclined surface, and the second extrusion block is a second inclined block with a second inclined surface. The second inclined surface can be abutted and pressed against the corresponding first inclined surface.

3. The pull-out box body structure according to claim 2, characterized in that The flange plate of the guide rail close to the top surface of the box body is denoted as the first flange plate, and the other flange plate of the guide rail is denoted as the second flange plate; the first inclined block is fixedly arranged on the first flange plate, and a preset gap is left between the first inclined block and the second flange plate, and the first inclined surface faces away from the first flange plate.

4. The pull-out box body structure according to claim 1, characterized in that The extension plate is a channel steel with its notch facing the top surface of the box body. One flange plate of the extension plate is connected to the side plate, and the other flange plate forms the connecting plate.

5. The pull-out box body structure according to claim 4, characterized in that One flange plate of the extension plate is detachably fixedly connected to the side plate through a second fastener.

6. The pull-out box structure according to claim 1, wherein the fixing plate is an L-shaped plate body, the plate surface of the first plate body of the L-shaped plate body is perpendicular to the plate surface of the pull-out bottom plate and is fixedly connected to the second end of the pull-out bottom plate, and both ends of the first plate body in the width direction of the pull-out bottom plate extend out of both sides of the pull-out bottom plate and are connected to the corresponding connecting plates through the first fasteners, and a handle is fixedly arranged on the second plate body of the L-shaped plate body.

7. The pull-out box structure according to claim 1, wherein rubber strips are arranged along the length direction of the guide rail at the bottom of each of the track grooves.

8. The pull-out box structure according to claim 2, wherein notches penetrating through the first end of the pull-out bottom plate are symmetrically formed on both sides of the first end of the pull-out bottom plate, folding plates extending towards the top surface of the box body are formed on both sides of the pull-out bottom plate and at the notches, and the second inclined block is arranged at the notch and is connected to the folding plate at the notch.

9. The pull-out box structure according to claim 8, wherein the second inclined block is detachably and fixedly connected to the folding plate at the notch through a third fastener.

10. The pull-out box structure according to claim 8, wherein the surface of the second inclined block facing away from the second inclined surface is flush with the recessed part.

11. The pull-out box structure according to claim 1, wherein a shielding plate is fixedly arranged at the first end of the pull-out bottom plate, and the shielding plate can extend out of the outside of one end of the guide rail.

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