Mounting structure of door and window sub-frame and mounting method thereof

Abstract

The application relates to a mounting structure of a door and window sub-frame and a mounting method thereof, and belongs to the technical field of building door and window matching components. The mounting structure of the door and window sub-frame and the mounting method thereof comprise a sub-frame main body, the sub-frame main body is composed of two first sub-frame sections and two second sub-frame sections to form a main body structure, chamfered surfaces are arranged at the two ends of the first sub-frame sections and the second sub-frame sections, plug-in blocks are jointly inserted into the inner sides of the first sub-frame sections and the second sub-frame sections, two sliding rail frames are fixedly arranged on the opposite sides of the first sub-frame sections, and sub-frame outer frames are fixedly arranged on the two sides of the sub-frame main body. In the application, the first sub-frame sections and the second sub-frame sections are aligned through the chamfered surfaces, the inner sides of the plug-in blocks are limited and matched with the outer sides of the metal angle codes to be clamped, and the second bolts are used for bidirectional locking. The structure is dispersed to bear force at corners and is not easy to deform and crack, the bolts are not needed to be welded for dismounting, the sections can be individually replaced, and the structure is suitable for various door and window openings.

Description

Technical Field

[0001] This invention belongs to the technical field of building door and window supporting components, specifically relating to an installation structure and installation method for a door and window sub-frame. Background Technology

[0002] Door and window subframes are basic support components embedded in the door and window openings of building walls. They rely on multiple profiles spliced ​​together to form a rectangular load-bearing frame, providing an assembly benchmark for the main door and window frames and sliding door panels. The complete construction process requires first completing the splicing and locking of the profile corners, and then assembling the internal guide rails and the outer protective frame in sequence. Standardized prefabricated operations can offset the dimensional deviations of the openings caused by civil construction and prevent the wall cement mortar from directly contacting the door and window metal profiles, thus preventing corrosion. With the increasing popularity of prefabricated buildings, the demand for door and window subframes that are non-hot-work, easy to disassemble and assemble, and have strong sealing properties is constantly expanding on construction sites. Reliable profile splicing structures are the core basic components that ensure the long-term installation accuracy and durability of doors and windows. Various types of civil building construction will use door and window subframes of corresponding specifications.

[0003] Existing door and window subframes use a single-outer-side clamping splicing structure to fix the profile corners, lacking a composite splicing structure with internal and external clamping. The ends of the profiles are simply joined together by the cut surfaces, and there is no internal support or limiting structure at the corners. During the profile splicing process, misalignment is prone to occur, and the overall regularity of the frame after molding is difficult to control. The continuous load generated by the daily opening and closing of doors and windows acts on the splicing gaps over a long period of time, causing the splicing gaps to gradually widen. The profile corners are prone to bending and deformation. Most traditional splicing structures use integrated welding fixation, and damaged profiles cannot be disassembled and replaced individually. On-site construction requires additional welding procedures, and the welded points are prone to corrosion, significantly shortening the overall service life of the door and window subframes. Therefore, there is a need for a door and window subframe installation structure and its installation method. Summary of the Invention

[0004] The purpose of this invention is to provide a simple and reasonably designed installation structure and installation method for a door and window sub-frame in order to solve the above problems.

[0005] The present invention achieves the above objectives through the following technical solutions: An installation structure for a door and window sub-frame includes a sub-frame body. The sub-frame body is composed of two first sub-frame profiles and two second sub-frame profiles. Both ends of the first and second sub-frame profiles are provided with beveled surfaces. Insertion blocks are inserted into the inner sides of the first and second sub-frame profiles. Two slide rails are fixedly installed on opposite sides of the two first sub-frame profiles. Sub-frame outer frames are fixedly installed on both sides of the sub-frame body.

[0006] As a further optimization of the present invention, the opening angle of the beveled surface is 45°, and when the beveled surfaces of the first sub-frame profile and the second sub-frame profile are connected, the first sub-frame profile and the second sub-frame profile are perpendicular to each other.

[0007] As a further optimization of the present invention, sheet metal corner brackets are fixedly provided on the outer sides of the first sub-frame profile and the second sub-frame profile. Several first threaded through holes are opened at both ends of the first sub-frame profile and the outer side of the sheet metal corner bracket is provided with several second bolts threaded through the first threaded through holes. Several second bolts are threadedly fixed on the plug block.

[0008] As a further optimization of the present invention, the outer frame of the sub-frame is mainly composed of an outer frame body fixedly disposed on the outside of the sub-frame body. The outer frame body has an insertion groove on the side facing the sub-frame body, and the first sub-frame profile and the second sub-frame profile are both disassembled and inserted into the inner side of the insertion groove.

[0009] As a further optimization of the present invention, a plurality of assembly slots are provided on the outer side of the outer frame body, and a plurality of second threaded through holes arranged at equal intervals are provided on the side of the first sub-frame profile and the second sub-frame profile facing the outer frame body. The second threaded through holes correspond one-to-one with the assembly slots, and a first bolt threadedly connected to the inner side of the second threaded through hole is passed through the outer side of the plurality of assembly slots.

[0010] As a further optimization of the present invention, first slots are provided at the upper and lower ends of the two second sub-frame profiles on opposite sides, and second slots corresponding to the first slots are provided on the four plug-in blocks. Several threaded holes are provided on the opposite sides of the two first sub-frame profiles. The slide rail bracket passes through the first slot and is movably inserted into the inner side of the second slot. Several mounting holes corresponding to the threaded holes are provided on the slide rail bracket. Third bolts that are threaded and fixed to the inner side of the threaded holes are passed through the outer side of the several mounting holes.

[0011] As a further optimization of the present invention, sealant is provided on both sides of the slide rail frame, and the sealant is fixedly provided at the joint between the first sub-frame profile and the outer frame body and the second sub-frame profile and the outer frame body.

[0012] An installation method for a door / window subframe mounting structure includes the following steps: Step 1) Insert the plug into the ends of the first sub-frame profile and the second sub-frame profile, and ensure that the beveled surfaces of the first sub-frame profile and the second sub-frame profile abut against each other; Step 2) Fix the L-shaped sheet metal corner bracket to the outside of the connection between the first sub-frame profile and the second sub-frame profile using the second bolt; Step 3) Insert the slide rail bracket through the first slot and then abut it against the inside of the second slot. Then fix the slide rail bracket to the first sub-frame profile with the third bolt. Step 4) Insert the outer frame body onto the outside of the sub-frame body and fix the outer frame body to the side of the sub-frame body with the first bolt, forming a sliding groove between the slide rail frame and the outer frame body.

[0013] The beneficial effects of this invention are as follows: 1. In this invention, the first and second sub-frame profiles are aligned and fitted together by a 45° bevel. The plug-in block is embedded inside the corner of the profile to achieve limiting support. The L-shaped sheet metal corner bracket is attached to the outside of the corner of the profile. The second bolt passes through the sheet metal corner bracket and the first threaded through hole in sequence and locks to the plug-in block, forming a locking splicing structure with internal and external bidirectional clamping. The internal and external bidirectional clamping structure can evenly distribute the external force borne by the corner of the frame and effectively suppress the deformation of gaps at the splicing position. The all-bolt assembly mode eliminates the need for on-site welding operations, avoids the risk of welding corrosion, and allows for individual disassembly and replacement when a single profile is damaged. The modular splicing structure is adaptable to various door and window opening sizes, lowers the threshold for assembly operations, and ensures the overall forming accuracy and structural stability of the frame under long-term use.

[0014] 2. In this invention, the slide rail bracket passes laterally through the first slot of the second sub-frame profile, and its end is engaged in the second slot of the plug-in block to achieve bidirectional limiting. The third bolt passes through the mounting hole of the slide rail bracket and locks it to the threaded hole of the first sub-frame profile. The sealant fills the assembly gap between the slide rail bracket, the slot, and the profile. The slide rail bracket adopts a split plug-in assembly form. After the slide rail wears out, it can be removed and replaced separately without disassembling the entire sub-frame body. The sealant fills all assembly gaps to prevent moisture and dust from penetrating into the frame. The slot limiting structure can limit the displacement of the slide rail bracket, always maintain the regularity of the door leaf guide structure, and ensure that the opening and closing process of the sliding door and window is smooth and without jamming.

[0015] 3. In this invention, the outer frame body is integrally fitted onto the outer side of the sub-frame body through the insertion groove. The sides of the first and second sub-frame profiles are completely embedded in the insertion groove. The first bolt passes through the assembly groove and the second threaded through hole to complete the locking. The sealant fills the gap between the profile and the insertion groove. The integrally fitted and covered structure can completely cover all the outer walls of the sub-frame body. During the civil construction stage, it can prevent mortar and gravel from directly scraping and eroding the profile surface. The full-coverage design of the insertion groove eliminates the exposed area on the outside of the profile. The sealant seals the insertion contact surface to prevent moisture from the wall from entering the interior of the sub-frame. The integral fitting assembly steps are simple. The complete wrapping protection can reduce the impact damage to the sub-frame body and extend the service life of the protective layer on the profile surface. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the sub-frame body of the present invention; Figure 3 This is a schematic diagram of the structure of the sub-frame body and the sheet metal corner bracket of the present invention. Figure 4 This is a schematic diagram of the structure of the sub-frame body and the outer frame body of the present invention.

[0017] In the diagram: 1. Sub-frame main body; 101. First sub-frame profile; 102. Second sub-frame profile; 103. Insert block; 104. First threaded through hole; 105. Second threaded through hole; 106. First slot; 107. Second slot; 108. Threaded hole; 109. Beveled surface; 2. Sheet metal corner bracket; 3. Slide rail bracket; 4. Sealant; 5. Sub-frame outer frame; 501. Outer frame body; 502. Insert groove; 503. Assembly groove; 504. First bolt; 6. Second bolt; 7. Mounting hole; 8. Third bolt. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] Example: Figure 2 and Figure 3As shown, an installation structure and method for a door / window sub-frame includes a sub-frame body 1. The sub-frame body 1 supports various components of the door / window frame and forms a rectangular base frame. The sub-frame body 1 is composed of two first sub-frame profiles 101 and two second sub-frame profiles 102. The first sub-frame profiles 101 form the upper and lower horizontal borders of the sub-frame body 1, and the second sub-frame profiles 102 form the left and right vertical borders of the sub-frame body 1. Both ends of the first sub-frame profiles 101 and the second sub-frame profiles 102 are provided with beveled surfaces 109. The beveled surfaces 109 are used to mate and achieve vertical positioning and fitting of the profiles. The opening angle of the beveled surfaces 109 is 45°. When the beveled surfaces 109 of the first sub-frame profiles 101 and the second sub-frame profiles 102 are connected, the first sub-frame profiles 101 and the second sub-frame profiles 102 mutually... Vertically, the inner sides of the first sub-frame profile 101 and the second sub-frame profile 102 are connected to a common insertion block 103. The insertion block 103 is used to support and limit the two profiles at the corner from the inside. Sheet metal corner brackets 2 are fixedly installed on the outer sides of the first sub-frame profile 101 and the second sub-frame profile 102. Sheet metal corner brackets 2 are used to clamp and fix the corner of the profile splicing from the outside. Both ends of the first sub-frame profile 101 and the second sub-frame profile 102 are provided with several first threaded through holes 104. Several second bolts 6 with threads passing through the first threaded through holes 104 are passed through the outer side of the sheet metal corner bracket 2. The first threaded through holes 104 are used to pass through the second bolts 6 to lock the sheet metal corner bracket 2. The second bolts 6 are used to lock the sheet metal corner bracket 2 and the insertion block 103 and fix the corner of the profile. Several second bolts 6 are all threadedly fixed on the insertion block 103.

[0020] like Figure 1 , Figure 2 and Figure 4As shown, two slide rail brackets 3 are fixedly installed on opposite sides of each of the two first sub-frame profiles 101. The slide rail brackets 3 are used to cooperate with the outer frame to form a sliding groove for the door leaf to slide and move. First slots 106 are provided at the upper and lower ends of opposite sides of each of the two second sub-frame profiles 102. The first slots 106 are used for the ends of the slide rail brackets 3 to pass through and achieve lateral limitation. Four plug-in blocks 103 are each provided with second slots 107 corresponding to the first slots 106. The second slots 107 are used to engage the ends of the slide rail brackets 3 and limit the longitudinal displacement of the slide rail brackets 3. Several threaded holes 108 are provided on opposite sides of each of the two first sub-frame profiles 101. After passing through the first slot 106, the slide rail 3 is movably inserted into the inner side of the second slot 107. The slide rail 3 has several mounting holes 7 that correspond one-to-one with the threaded holes 108. The outer side of each mounting hole 7 is threaded with a third bolt 8 that is fixed inside the threaded hole 108. The threaded hole 108 is used to lock and fix the slide rail 3 with the third bolt 8. The mounting hole 7 is used to pass through the third bolt 8 to complete the assembly and fixation of the slide rail 3. The third bolt 8 is used to lock and fix the slide rail 3 to the side wall of the first sub-frame profile 101. Both sides of the slide rail 3 are provided with sealant 4. The sealant 4 is used to fill the assembly gaps and prevent moisture and dust from penetrating.

[0021] like Figure 1 and Figure 4 As shown, a sub-frame outer frame 5 is fixedly installed on both sides of the sub-frame main body 1. The sub-frame outer frame 5 is used to adapt to the wall opening and to cover and protect the outside of the sub-frame main body 1. The sub-frame outer frame 5 has an outer frame body 501 fixedly installed on the outside of the sub-frame main body 1 as its main structure. The outer frame body 501 is used to form the main body of the sub-frame outer frame 5. Slots are opened to assemble profiles. An insertion groove 502 is opened on the side of the outer frame body 501 facing the sub-frame main body 1. The insertion groove 502 is used for the side of the first and second sub-frame profiles 102 to be inserted and plugged in. The first sub-frame profile 101 and the second sub-frame profile 102 are both detached and inserted into the inside of the insertion groove 502. Several assembly slots 503 are opened on the outside of the outer frame body 501. The first sub-frame profile 101 and the second sub-frame profile On one side of the outer frame body 501, 102 is provided with several equally spaced second threaded through holes 105. The second threaded through holes 105 correspond one-to-one with the assembly grooves 503. The outer sides of the assembly grooves 503 are all threaded with first bolts 504 that are threaded to the inner side of the second threaded through holes 105. The assembly grooves 503 are used to avoid the first bolts 504, so as to facilitate the bolts to be inserted and locked. The second threaded through holes 105 are used to thread the first bolts 504 to fix the outer frame body 501. The first bolts 504 are used to detachably lock the outer frame body 501 and the sub-frame body 1. The sealant 4 is fixedly installed at the insertion points between the first sub-frame profile 101 and the outer frame body 501 and between the second sub-frame profile 102 and the outer frame body 501.

[0022] An installation method for a door / window subframe mounting structure includes the following steps: Step 1) Insert the plug block 103 into the ends of the first sub-frame profile 101 and the second sub-frame profile 102, and ensure that the beveled surfaces 109 of the first sub-frame profile 101 and the second sub-frame profile 102 abut against each other; Step 2) Fix the L-shaped sheet metal corner bracket 2 to the outside of the connection between the first sub-frame profile 101 and the second sub-frame profile 102 using the second bolt 6; Step 3) Insert the slide rail bracket 3 through the first slot 106 and then abut it against the inside of the second slot 107. Then fix the slide rail bracket 3 on the first sub-frame profile 101 with the third bolt 8. Step 4) Insert the outer frame body 501 on the outside of the sub-frame body 1 and fix the outer frame body 501 to the side of the sub-frame body 1 with the first bolt 504. A sliding groove is formed between the slide rail bracket 3 and the outer frame body 501. The sliding groove is used to provide a guide channel for the door and window leaf to slide.

[0023] It should be noted that, regarding the installation structure and method of this type of door and window subframe, when the operator carries out the assembly work of the door and window subframe, four profiles are first taken, including two first subframe profiles 101 and two second subframe profiles 102. The ends of the four profiles are all machined with 45° beveled surfaces 109. First, take the plug-in block 103 and align it with the splicing position of the ends of the profiles. Then, insert the plug-in block 103 into the inner side of the ends of the first subframe profile 101 and the second subframe profile 102, so that the 45° beveled surfaces 109 of the first subframe profile 101 and the second subframe profile 102 are completely abutted and fitted against each other. The angle limit of the beveled surface 109 keeps the two profiles in a perpendicular intersecting frame corner shape. The plug-in block 103 will form an internal support positioning for the two intersecting profiles from the inside of the profiles, avoiding the profiles from shifting or misaligning during the splicing process.

[0024] After the pre-installation and positioning of the plug-in block 103 and the end of the profile are completed, the L-shaped sheet metal corner bracket 2 is placed on the outside of the corner where the first sub-frame profile 101 and the second sub-frame profile 102 are spliced. The hole on the sheet metal corner bracket 2 is aligned with the first threaded through hole 104 and the threaded hole 108 inside the plug-in block 103. Then, the second bolt 6 is inserted in sequence, and the second bolt 6 passes through the sheet metal corner bracket 2 and the first threaded through hole 104 and is threaded and locked inside the plug-in block 103. The sheet metal corner bracket 2 and the plug-in block 103 clamp and fix the two profiles at the corner from the outside and inside of the frame respectively. This completes the locking operation of a single corner of the sub-frame body 1. Repeat this operation to complete the splicing and fixing of the four profiles at four corners, forming a complete rectangular frame structure of the sub-frame body 1.

[0025] Next, the slide rail 3 is used to assemble the internal sliding structure. First, observe the first slot 106 opened at the upper and lower ends of the inner side of the second sub-frame profile 102 and the second slot 107 opened on the plug block 103. Align one end of the slide rail 3 with the first slot 106 and insert it horizontally. Continue to push the slide rail 3 until the end of the slide rail 3 is inserted into the second slot 107. At this time, the slide rail 3 spans between the two oppositely arranged first sub-frame profiles 101. The mounting holes 7 opened on the surface of the slide rail 3 correspond one-to-one with the threaded holes 108 pre-set on the side wall of the first sub-frame profile 101. After the third bolt 8 is passed through the mounting hole 7, it is screwed into the threaded hole 108 to lock and fix the slide rail 3 to the first sub-frame profile 101. After the slide rail 3 is assembled, sealant 4 is applied to both sides of it. The sealant 4 fills the assembly gap between the slide rail 3 and the inner wall of the slot and the side wall of the profile, blocking the flow channel of water vapor and dust in the gap.

[0026] After the internal slide rail structure of the sub-frame body 1 is assembled, the assembly process of the sub-frame outer frame 5 is carried out. The outer frame body 501 is used to form the basic structure of the sub-frame outer frame 5. The side of the outer frame body 501 facing the sub-frame body 1 has a pre-reserved insertion groove 502. The insertion groove 502 is aligned with the first sub-frame profile 101 and the second sub-frame profile 102 on the side of the sub-frame body 1 and fastened inward, so that the sides of the first sub-frame profile 101 and the second sub-frame profile 102 are completely embedded in the insertion groove 502. Several assembly grooves 503 are distributed on the outer side of the outer frame body 501. The positions of the assembly grooves 503 and the second threaded through holes 105 arranged equidistantly on the side wall of the profile are one-to-one. After a bolt 504 passes through the assembly groove 503, it is tightened and connected to the second threaded through hole 105. The first bolt 504 is used to complete the detachable locking between the outer frame body 501 and the sub-frame body 1. Before assembly, sealant 4 is applied to the inner wall of the insertion groove 502. The sealant 4 fills the insertion contact surfaces between the outer frame body 501 and the first sub-frame profile 101 and the second sub-frame profile 102, further improving the sealing performance of the frame splicing position. After the outer frame body 501 is assembled in place, the top surface of the slide rail 3 and the inner side wall of the outer frame body 501 will naturally form a through sliding groove. The door and window leaf can then slide along the sliding groove.

[0027] After the overall assembly is completed, the auxiliary structures of the frame work together synchronously to achieve a stable performance. The 45° beveled surface 109 can improve the fitting accuracy of the corner splicing of the sub-frame body 1. The double locking structure of the plug block 103 and the outer sheet metal corner bracket 2 can disperse the tensile and shear stress on the corner of the frame during the use of the door and window, and reduce the probability of cracking and deformation at the splicing of the profile. The slide rail frame 3 is assembled by means of the slots at both ends and the third bolt 8. After the slide rail wears out, it can be disassembled and replaced separately without disassembling the sub-frame body 1. The multi-layer sealant 4 is placed at two key sealing points, namely the slide rail assembly gap and the outer frame plug gap, to prevent rainwater and dust from seeping into the frame. The outer frame body 501 can be quickly disassembled and assembled by the first bolt 504, which makes it easy to flexibly replace the sub-frame outer frame 5 with the appropriate specifications according to the wall opening size on site. The entire structure adopts the bolt detachable connection method, avoiding the defects of corrosion and inability to disassemble and repair caused by traditional welding fixation.

[0028] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An installation structure for a door / window sub-frame, comprising a sub-frame body (1), characterized in that, The sub-frame body (1) is composed of two first sub-frame profiles (101) and two second sub-frame profiles (102) forming the main structure. Both ends of the first sub-frame profiles (101) and the second sub-frame profiles (102) are provided with beveled surfaces (109). The inner sides of the first sub-frame profiles (101) and the second sub-frame profiles (102) are connected to a common plug block (103). Two slide rail frames (3) are fixedly provided on opposite sides of the two first sub-frame profiles (101). Sub-frame outer frames (5) are fixedly provided on both sides of the sub-frame body (1).

2. The installation structure of a door / window sub-frame according to claim 1, characterized in that: The opening angle of the beveled surface (109) is 45°. When the beveled surfaces (109) of the first sub-frame profile (101) and the second sub-frame profile (102) are connected, the first sub-frame profile (101) and the second sub-frame profile (102) are perpendicular to each other.

3. The installation structure of a door and window sub-frame according to claim 1, characterized in that: Sheet metal corner brackets (2) are fixedly provided on the outer side of the first sub-frame profile (101) and the second sub-frame profile (102). Both ends of the first sub-frame profile (101) and the second sub-frame profile (102) are provided with a number of first threaded through holes (104). A number of second bolts (6) threaded through the first threaded through holes (104) are passed through the outer side of the sheet metal corner bracket (2). The number of second bolts (6) are threadedly fixed on the plug block (103).

4. The installation structure of a door and window sub-frame according to claim 1, characterized in that: The sub-frame outer frame (5) is mainly composed of an outer frame body (501) fixedly installed on the outside of the sub-frame body (1). The outer frame body (501) has a plug-in groove (502) on the side facing the sub-frame body (1). The first sub-frame profile (101) and the second sub-frame profile (102) are both disassembled and plugged into the inside of the plug-in groove (502).

5. The installation structure of a door / window sub-frame according to claim 4, characterized in that: The outer frame body (501) has several assembly slots (503) on its outer side. The first sub-frame profile (101) and the second sub-frame profile (102) have several equally spaced second threaded through holes (105) on the side facing the outer frame body (501). The second threaded through holes (105) correspond one-to-one with the assembly slots (503). The outer side of the several assembly slots (503) is threaded with a first bolt (504) that is threaded into the inner side of the second threaded through hole (105).

6. The installation structure of a door / window sub-frame according to claim 4, characterized in that: The two second sub-frame profiles (102) have first slots (106) at both ends on opposite sides. The four plug-in blocks (103) have second slots (107) corresponding to the first slots (106). The two first sub-frame profiles (101) have several threaded holes (108) on opposite sides. The slide rail (3) passes through the first slot (106) and is movably inserted into the inner side of the second slot (107). The slide rail (3) has several mounting holes (7) corresponding to the threaded holes (108). The outer side of each mounting hole (7) is threaded with a third bolt (8) that is fixed inside the threaded hole (108).

7. The installation structure of a door and window sub-frame according to claim 6, characterized in that: Both sides of the slide rail frame (3) are provided with sealant (4), which is fixedly installed at the joint between the first sub-frame profile (101) and the outer frame body (501) and the second sub-frame profile (102) and the outer frame body (501).

8. The installation method of the door and window sub-frame installation structure according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1) Insert the plug block (103) into the ends of the first sub-frame profile (101) and the second sub-frame profile (102), and ensure that the beveled surfaces (109) of the first sub-frame profile (101) and the second sub-frame profile (102) abut against each other; Step 2) Fix the L-shaped sheet metal corner bracket (2) to the outside of the connection between the first sub-frame profile (101) and the second sub-frame profile (102) using the second bolt (6); Step 3) Insert the slide rail bracket (3) through the first slot (106) and then abut it against the inside of the second slot (107). Then fix the slide rail bracket (3) on the first sub-frame profile (101) with the third bolt (8). Step 4) Insert the outer frame body (501) on the outside of the sub-frame body (1) and fix the outer frame body (501) to the side of the sub-frame body (1) with the first bolt (504). A sliding groove is formed between the slide rail bracket (3) and the outer frame body (501).

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