Three-section load-bearing guide rail assembly

Abstract

The present invention discloses a three-section load-bearing guide rail assembly. Compared with the prior art, the three-section load-bearing guide rail assembly of the present invention, on the one hand, makes the relative moving distance of the inner rail and the middle rail always equal during the moving process through the meshing cooperation of the synchronous gear and the two synchronous racks, so that the guide rail assembly has a synchronization effect. On the other hand, a lower pulley is arranged on the lower side of the middle rail, and the lower pulley supports the inner rail and the middle rail at the same time. A common set of pulleys can realize the sliding cooperation between the inner rail and the middle rail, and the middle rail and the outer rail, which can improve the balance, smoothness and bearing capacity of the guide rail assembly during movement; through the combined improvement of the above two aspects, the guide rail assembly can effectively avoid slipping and jamming due to poor synchronization during the moving, opening or storage process.

Description

Technical Field

[0001] The invention relates to the field of hardware products, and in particular to a three-section load-bearing guide rail assembly. Background Art

[0002] The common three-section drawer rails consist of a fixed rail, a middle rail and an inner rail. The fixed rail is installed in the cabinet, the movable rail is used to connect with the drawer, and the middle rail is connected to the fixed rail and the inner rail respectively. When opening or closing the drawer, the middle rail can slide along the fixed rail, and the inner rail can slide along the middle rail to reset or pull out the drawer. Since there are two movable rails, the drawer can move a large distance, but it is also easy for the rail to get stuck or slip due to poor synchronization between the middle rail and the inner rail. Especially when the load is large, the friction between the rails also increases accordingly, making the above situation more likely to occur, which is not conducive to the user experience.

[0003] In summary, the existing three-section drawer guide rail structure needs to be further improved so that the guide rail has better synchronization. Summary of the invention

[0004] The purpose of the present invention is to provide a three-section load-bearing guide rail assembly. The three-section load-bearing guide rail assembly of the present invention achieves the effect that two sections of the guide rails can move synchronously during the process of opening or closing the drawer through structural improvement.

[0005] In order to achieve the above invention object, the present invention adopts the following technical scheme:

[0006] The three-section load-bearing guide rail assembly comprises an outer rail, a middle rail and an inner rail, wherein the outer rail and the middle rail are both provided with a accommodating space with a front end opening, wherein the middle rail can be movably installed in the outer rail accommodating space relative to the outer rail, and wherein the inner rail can be movably installed in the middle rail accommodating space relative to the middle rail, and further comprises a gear synchronization mechanism, wherein the gear synchronization mechanism comprises a synchronization gear, a first synchronization rack and a second synchronization rack, wherein a gear mounting hole is provided in the middle of the middle rail, wherein the synchronization gear can be rotatably installed in the gear mounting hole, and wherein the first synchronization rack is fixedly installed in the middle of the inner side of the bottom wall of the outer rail and is rotatably installed in the gear mounting hole, ... rotatably installed in the gear mounting hole, wherein the first synchronization rack is fixedly installed in the middle of the inner side of the bottom wall of the outer rail and is rotatably installed in the gear The second synchronous rack is fixedly installed in the middle part of the outer side of the bottom wall of the inner rail and placed along its length direction, the first synchronous rack is meshed with the lower side of the synchronous gear, and the second synchronous rack is meshed with the upper side of the synchronous gear; a plurality of lower pulleys are arranged at intervals on the lower sides of the inner sides of the two side walls of the middle rail, and the bottom wall of the middle rail is provided with pulley through holes corresponding to the lower pulleys, and the lower pulleys are slidably matched with the bottom wall of the outer rail through the corresponding pulley through holes; side walls are arranged on both sides of the inner rail, and the upper ends of the two side walls of the inner rail are provided with inner rail top edges extending outward, and the lower side of the inner rail top edge is slidably matched with the lower pulley.

[0007] On the one hand, the three-section load-bearing guide rail assembly of the present invention meshes with the two synchronous racks to make the relative movement distance of the inner rail and the middle rail during the movement always equal, so that the guide rail assembly has a synchronization effect. On the other hand, a lower pulley is arranged on the lower side of the middle rail, and the lower pulley supports the inner rail and the middle rail at the same time. Sharing a set of pulleys can realize the sliding cooperation between the inner rail and the middle rail, and the middle rail and the outer rail, which can improve the balance, smoothness and bearing capacity of the guide rail assembly during movement; through the combined improvement of the above two aspects, the guide rail assembly can effectively avoid slipping and jamming due to poor synchronization during the process of moving, opening or storing. Compared with the prior art, the guide rail assembly of the present invention has good synchronization performance and can remain smooth during operation, which is conducive to further improving the user experience.

[0008] Preferably, a first slot body with a lower opening is provided on the lower side of the bottom wall of the middle rail along its length, and the upper part of the first synchronous rack is assembled in the first slot body. A second slot body with a lower opening is provided on the middle part of the bottom wall of the inner rail along its length, and the second synchronous rack is mounted in the second slot body. The gear mounting hole passes through the top wall of the first slot body, and the upper side of the synchronous gear protrudes from the upper side of the top wall of the first slot body and meshes with the second synchronous rack, and the lower side of the synchronous gear meshes with the first synchronous rack in the first slot body. This solution realizes the assembly of the first synchronous rack and the second synchronous rack by providing the first slot body and the second slot body, respectively, and realizes the compact fit between the synchronous gear and the synchronous rack, which is beneficial to the rapid arrangement and assembly of the gear synchronization mechanism; in addition, since this solution can design the height of the two slot bodies according to the height of the synchronous rack and the diameter of the gear, it can reduce the pressure on the synchronous gear and the second synchronous rack, and reduce the friction between the synchronous rack and the synchronous gear, thereby improving the performance of the guide rail.

[0009] Preferably, the outer rail, the middle rail and the inner rail are hardware parts, the middle part of the bottom wall of the middle rail protrudes upward along its length direction to form the first slot body, the middle part of the bottom wall of the inner rail protrudes upward along its length direction to form the second slot body, the gear mounting hole passes through the top wall and the side wall of the first slot body, and the synchronous gear is installed in the gear mounting hole through a gear bracket. The first slot body and the second slot body of this solution can be integrally formed with the guide rail by stamping, which is conducive to simplifying the processing process.

[0010] Preferably, a plurality of upper pulleys are provided at intervals on the upper ends of the two side walls of the middle rail, and the upper ends of the two outer side walls are provided with outer rail top edges extending inward, and the upper pulleys are slidably matched with the lower sides of the outer rail top edges. The upper pulleys of this solution fix the middle rail to make the guide rail structure more stable.

[0011] Furthermore, the upper side of the inner rail top edge is slidably matched with the upper pulley. The upper pulley of this solution is arranged between the inner rail top edge and the outer rail top edge, has a fixing effect on the inner rail, and supports the upper side of the middle rail, thereby matching with the lower pulley to make the force on the middle rail more balanced.

[0012] In order to realize the linear pulling out and retracting functions of the guide rail assembly, the inner side of the bottom wall of the outer rail, the lower side of the top edge of the outer rail, the upper side of the top edge of the inner rail and the lower side of the top edge of the inner rail are respectively provided with convex rails along their length directions, and the upper pulley and the lower pulley are both provided with guide grooves, and the convex rails on the inner side of the bottom wall of the outer rail and the lower side of the top edge of the inner rail are slidably matched with the guide grooves of the lower pulley, and the convex rails on the lower side of the top edge of the outer rail and the upper side of the top edge of the inner rail are slidably matched with the guide grooves of the upper pulley.

[0013] Preferably, the middle rail is provided with a first buffer device, and the inner rail is provided with a second buffer device. The side wall of the middle rail is higher than the side wall of the inner rail, and the side wall of the outer rail is higher than the side wall of the middle rail. The first buffer device is fixed on the upper side of the side wall of the middle rail, and the second buffer device is fixed on the inner side of the bottom wall of the inner rail away from the first buffer device. The upper side of one side wall of the outer rail is provided with a first push block corresponding to the first buffer device, and the upper side of the other side wall of the outer rail is provided with a second push block corresponding to the second buffer device. When the middle rail moves outward until the first push block pushes the first buffer device, the first buffer device decelerates the middle rail, and when the inner rail moves inward until the second push block pushes the second buffer device, the second buffer device decelerates the inner rail. This solution realizes the buffering function of the guide rail assembly when it moves outward and inward respectively through the cooperation of the first buffer device and the first push block, and the cooperation of the second buffer device and the second push block. Compared with existing guide rail products, it has better buffering and silencing effects.

[0014] Furthermore, the first buffer device is installed at the rear of the middle rail, the triggering part of the first buffer device faces the front end of the middle rail, and the first push-stop member is installed at the front of the side wall on the corresponding side of the outer rail; the second buffer device is installed at the inner front of the inner rail, the triggering part of the second buffer device faces the rear end of the inner rail, and the second push-stop member is arranged at the rear of the side wall on the corresponding side.

[0015] Preferably, a stop slope extending downward is provided at the rear of the top edge of the outer rail, and the thickness of the stop slope increases from its front end to the rear end. When the upper pulley on the rearmost side slides to the stop slope, it is squeezed and stopped, so as to realize the stopping function after the guide rail is reset.

[0016] Preferably, the bottom wall of the outer rail is provided with a groove that deepens backwards corresponding to the position where the lower pulley is stored in the middle rail, and when the lower pulley slides to the groove, gravity guidance is generated, so that after the middle rail is retracted to a certain distance, it can be reset by its own gravity. The storage position of the middle rail of the present invention refers to the position of the lower pulley after the middle rail is stored in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the structural decomposition of the three-section load-bearing guide rail assembly Figure 1 ;

[0018] Figure 2 It is the structural decomposition of the three-section load-bearing guide rail assembly Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the structure of a three-section load-bearing guide rail assembly. Figure 1 ;

[0020] Figure 4 It is a cross-sectional view of a three-section load-bearing guide rail assembly;

[0021] Figure 5 yes Figure 4 A magnified view of part B;

[0022] Figure 6 yes Figure 1 A magnified view of part A;

[0023] Figure 7 This is a schematic diagram of the structure of a three-section load-bearing guide rail assembly. Figure 2 ;

[0024] Figure 8 This is a schematic diagram of the structure of a three-section load-bearing guide rail assembly. Figure 3 (Buffer device and gear synchronization mechanism are not shown);

[0025] Fig. 9 yes Figure 8 Enlarged view of part C.

[0026] Description of labels:

[0027] Three-section load-bearing guide rail assembly 1:

[0028] Outer rail 2: outer rail accommodating space 201, first synchronous rack 202, first push block 2041, second push block 2042, stop slope 205, slope groove 206, convex rail 207;

[0029] Middle rail 3: middle rail accommodating space 301, gear mounting hole 3011, gear bracket 307, bracket body 3071, through hole 3072, mounting shaft 3073, synchronous gear 302, first slot 303, first buffer device 304, upper pulley 305, lower pulley 306, pulley through hole 3061, first mounting bracket 3041, guide groove 3051;

[0030] Inner rail 4: second synchronous rack 401 , second slot body 402 , second buffer device 403 , second mounting bracket 4031 . DETAILED DESCRIPTION

[0031] In order to achieve the above invention object, the present invention adopts the following technical scheme:

[0032] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by “upper”, “lower”, “front”, “back”, “horizontal”, “inside”, “outside”, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] like Figure 1-9 As shown, the three-section load-bearing guide rail assembly 1 of the present invention includes an outer rail 2, a middle rail 3 and an inner rail 4. The outer rail 2 and the middle rail 3 are both provided with a accommodating space with a front end opening. The middle rail 3 can be movably installed in the outer rail accommodating space 201 relative to the outer rail 2, and the inner rail 4 can be movably installed in the middle rail accommodating space 301 relative to the middle rail 3. It also includes a gear synchronization mechanism, and the gear synchronization mechanism includes a synchronization gear 302, a first synchronization rack 202 and a second synchronization rack 401. A gear mounting hole 3011 is provided in the middle of the middle rail 3, and the synchronization gear 302 can be rotatably installed in the gear mounting hole 3011. The first synchronization rack 202 is fixedly installed in the middle of the inner side of the bottom wall of the outer rail 2 and along its length direction, the second synchronous rack 401 is fixedly installed in the middle part of the outer side of the bottom wall of the inner rail 4 and placed along its length direction, the first synchronous rack 202 is meshed with the lower side of the synchronous gear 302, and the second synchronous rack 401 is meshed with the upper side of the synchronous gear 302; a plurality of lower pulleys 306 are arranged at intervals on the lower sides of the inner sides of the two side walls of the middle rail 3, and a pulley through hole 3061 is arranged on the bottom wall of the middle rail 3 corresponding to the lower pulley 306, and the lower pulley 306 is slidably matched with the bottom wall of the outer rail 2 through the corresponding pulley through hole 3061; side walls are arranged on both sides of the inner rail 4, and the upper ends of the two side walls of the inner rail 4 are provided with a top edge of the inner rail 4 extending outward, and the lower side of the top edge of the inner rail 4 is slidably matched with the lower pulley 306.

[0034] According to further optimization of the above-mentioned gear synchronization mechanism scheme, a first groove body 303 with a lower opening is provided on the lower side of the bottom wall of the middle rail 3 along its length, and the upper part of the first synchronization rack 202 is assembled in the first groove body 303, and a second groove body 402 with a lower opening is provided in the middle part of the bottom wall of the inner rail 4 along its length direction, and the second synchronization rack 401 is installed in the second groove body 402, and the gear mounting hole 3011 passes through the top wall of the first groove body 303, and the upper side of the synchronization gear 302 protrudes from the upper side of the top wall of the first groove body 303 and meshes with the second synchronization rack 401, and the lower side of the synchronization gear 302 meshes with the first synchronization rack 202 in the first groove body 303. This solution realizes the assembly of the first synchronous rack 202 and the second synchronous rack 401 respectively by setting the first groove body 303 and the second groove body 402, thereby realizing the compact fit between the synchronous gear 302 and the synchronous rack, which is beneficial to the rapid arrangement and assembly of the gear synchronization mechanism; in addition, since this solution can design the height of the two groove bodies according to the height of the synchronous rack and the diameter of the gear, it can reduce the pressure on the synchronous gear 302 and the second synchronous rack 401, reduce the friction between the synchronous rack and the synchronous gear 302, and thus improve the performance of the guide rail.

[0035] According to further optimization of the gear synchronization mechanism scheme, the outer rail 2, the middle rail 3 and the inner rail 4 are hardware parts, the middle part of the bottom wall of the middle rail 3 protrudes upward along its length direction to form the first slot body 303, the middle part of the bottom wall of the inner rail 4 protrudes upward along its length direction to form the second slot body 402, the gear mounting hole 3011 passes through the top wall and side wall of the first slot body 303, and the synchronous gear 302 is installed in the gear mounting hole 3011 through the gear bracket 307. The first slot body 303 and the second slot body 402 of this scheme can be integrally formed with the guide rail by stamping, which is conducive to simplifying the processing process.

[0036] In order to realize the installation of the synchronous gear 302, the gear bracket 307 is installed on the upper side of the top wall of the first groove body 303, and it includes a bracket body 3071 and an installation shaft 3073. The bracket body 3071 is provided with a gear through hole 3072 at the position corresponding to the gear mounting hole 3011, and the two ends of the installation shaft 3073 are connected to the two side walls of the gear through hole 3072. The synchronous gear 302 is sleeved on the installation shaft 3073 and can rotate relative to it.

[0037] In order to make the guide rail structure more stable, a plurality of upper pulleys 305 are provided at intervals on the upper ends of the two side walls of the middle rail 3, and the upper ends of the two outer side walls are provided with the top edges of the outer rails 2 extending inward, and the upper pulleys 305 are slidably matched with the lower sides of the top edges of the outer rails 2 to fix the middle rail 3. The upper sides of the top edges of the inner rails 4 are slidably matched with the upper pulleys 305 to fix the inner rails 4 and support the upper sides of the middle rails 3, thereby matching with the lower pulleys 306 to make the force on the middle rails 3 more balanced.

[0038] like Figure 8-9 As shown, in order to realize the linear pulling out and retracting functions of the guide rail assembly, the inner side of the bottom wall of the outer rail 2, the lower side of the top edge of the outer rail 2, the upper side of the top edge of the inner rail 4 and the lower side of the top edge of the inner rail 4 are respectively provided with convex rails 207 along their length directions, and the upper pulley 305 and the lower pulley 306 are both provided with guide grooves 3051. The convex rails 207 on the inner side of the bottom wall of the outer rail 2 and the lower side of the top edge of the inner rail 4 are slidably matched with the guide grooves 3051 of the lower pulley 306, and the convex rails 207 on the lower side of the top edge of the outer rail 2 and the upper side of the top edge of the inner rail 4 are slidably matched with the guide grooves 3051 of the upper pulley 305.

[0039] like Figure 2 , 4 As shown, each side wall is provided with a lower pulley 306, which is respectively arranged at the front, middle and rear of the middle rail 3, and each side wall is provided with an upper pulley 305, which is respectively arranged at the front and middle of the middle rail 3 and corresponds to the position of the lower pulley 306. In this way, when the guide rail is pulled out and retracted, the positions of the upper pulley 305 and the lower pulley 306 will be staggered, thereby reducing the pressure on the lower pulley 306 during the movement, thereby reducing the friction between the lower pulley 306 and the top edge of the inner rail 4 and the bottom wall of the outer rail 2.

[0040] In addition to the above, in practical applications, the number of the upper pulleys 305 and the lower pulleys 306 can be adjusted according to the specifications of the guide rails; for example, the number of the lower pulleys 306 is set to n, and the number of the upper pulleys 305 is set to n-1 accordingly.

[0041] In order to achieve better buffering and silencing effects, the middle rail 3 is provided with a first buffer device 304, and the inner rail 4 is provided with a second buffer device 403. The side wall of the middle rail 3 is higher than the side wall of the inner rail 4, and the side wall of the outer rail 2 is higher than the side wall of the middle rail 3. The first buffer device 304 is fixed to the upper side of the side wall of the middle rail 3, and the upper side of the middle rail 3 is provided with a first mounting bracket 3041 in cooperation with the first buffer device 304. The second buffer device 403 is fixed to the inner side of the bottom wall of the inner rail 4 away from the first buffer device 304, and the bottom wall of the inner rail 4 is cooperated with the second buffer device 403 is provided with a second mounting bracket 4031, a first push block 2041 is provided on the upper side of one side wall of the outer rail 2 corresponding to the first buffer device 304, and a second push block 2042 is provided on the upper side of the other side wall of the outer rail 2 corresponding to the second buffer device 403, when the middle rail 3 moves outward to the first push block 2041 pushing the first buffer device 304, the first buffer device 304 decelerates the middle rail 3, and when the inner rail 4 moves inward to the second push block 2042 pushing the second buffer device 403, the second buffer device 403 decelerates the inner rail 4. This solution realizes the buffering function of the guide rail assembly when it moves outward and inward respectively through the cooperation of the first buffer device 304 and the first push block 2041, and the cooperation of the second buffer device 403 and the second push block 2042.

[0042] According to further optimization of the above-mentioned buffering scheme, the first buffer device 304 is installed at the rear of the middle rail 3, the triggering part of the first buffer device 304 faces the front end of the middle rail 3, and the first push-stop member 2041 is installed at the front of the side wall on the corresponding side of the outer rail 2; the second buffer device 403 is installed at the inner front of the inner rail 4, the triggering part of the second buffer device 403 faces the rear end of the inner rail 4, and the second push-stop member 2042 is arranged at the rear of the side wall on the corresponding side.

[0043] Of course, the above buffering scheme can also be appropriately adjusted according to actual needs, such as setting the first push member 2041 at the rear part of the side wall of the outer rail 2, and setting the second push member 2042 at the rear part of the side wall of the other side rail 2, and then adaptively adjusting the positions of the first buffer device 304 and the second buffer device 403; or, setting the first buffer device 304 and the second buffer device 403 on the same guide rail.

[0044] In order to realize the stopping function after the guide rail is reset, a downwardly extending stop slope 205 is provided at the rear of the top edge of the outer rail 2. The thickness of the stop slope 205 increases from its front end to the rear end. When the upper pulley 305 on the rearmost side slides to the stop slope 205, it is squeezed and stopped.

[0045] like Figure 4 As shown, in order to make the return process of the guide rail smoother, the diameter of the upper pulley 305 on the rearmost side is designed to be slightly larger than the diameter of the upper pulley 305 on the front side.

[0046] In order to allow the middle rail 3 to be restored by its own gravity after being retracted to a certain distance, the bottom wall of the outer rail 2 is provided with a slope groove 206 that deepens backwards corresponding to the position where the lower pulley 306 is stored in the middle rail 3, and gravity guidance is generated when the lower pulley 306 slides into the slope groove 206.

[0047] On the one hand, the three-section load-bearing guide rail assembly 1 of the present invention, through the meshing cooperation of the synchronous gear 302 and the two synchronous racks, makes the relative movement distance of the inner rail 4 and the middle rail 3 during the movement always equal, so that the guide rail assembly has a synchronization effect. On the other hand, a lower pulley 306 is arranged on the lower side of the middle rail 3, and the lower pulley 306 supports the inner rail 4 and the middle rail 3 at the same time. Sharing a set of pulleys can realize the sliding cooperation between the inner rail 4 and the middle rail 3, and the middle rail 3 and the outer rail 2, which can improve the balance, smoothness and bearing capacity of the guide rail assembly during movement; through the combined improvement of the above two aspects, the guide rail assembly can effectively avoid slipping and jamming due to poor synchronization during the process of moving, opening or storing. Therefore, the guide rail assembly of the present invention has good synchronization performance and can remain smooth and smooth during operation, which is conducive to further improving the user experience.

[0048] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A three-section load-bearing guide rail assembly, comprising an outer rail, a middle rail and an inner rail, wherein the outer rail and the middle rail are both provided with a receiving space with a front end opening, wherein the middle rail can be movably installed in the outer rail receiving space relative to the outer rail, and the inner rail can be movably installed in the middle rail receiving space relative to the middle rail, wherein: It also includes a gear synchronization mechanism, which includes a synchronization gear, a first synchronization rack and a second synchronization rack. A gear mounting hole is provided in the middle of the middle rail, and the synchronization gear can be rotatably mounted in the gear mounting hole. The first synchronization rack is fixedly mounted in the middle of the inner side of the bottom wall of the outer rail and placed along its length direction. The second synchronization rack is fixedly mounted in the middle of the outer side of the bottom wall of the inner rail and placed along its length direction. The first synchronization rack is meshed with the lower side of the synchronization gear, and the second synchronization rack is meshed with the upper side of the synchronization gear. A plurality of lower pulleys are provided at intervals on the lower side of the inner sides of the two side walls of the middle rail, and pulley through holes are provided on the bottom wall of the middle rail corresponding to the lower pulleys, and the lower pulleys are connected to the corresponding pulley through holes. The bottom wall of the outer rail is slidably engaged; side walls are provided on both sides of the inner rail, and the upper ends of the two side walls of the inner rail are provided with inner rail top edges extending outward, and the lower side of the inner rail top edge is slidably engaged with the lower pulley; a first groove body with an opening on the lower side is provided on the lower side of the bottom wall of the middle rail along its length, and the upper part of the first synchronous rack is assembled in the first groove body, and a second groove body with an opening on the lower side is provided in the middle part of the bottom wall of the inner rail along its length direction, and the second synchronous rack is installed in the second groove body, and the gear mounting hole passes through the top wall of the first groove body, and the upper side of the synchronous gear protrudes from the upper side of the top wall of the first groove body and meshes with the second synchronous rack, and the lower side of the synchronous gear is meshed with the first synchronous rack in the first groove body.

2. The three-section load-bearing guide rail assembly according to claim 1, characterized in that: The outer rail, the middle rail and the inner rail are hardware parts. The middle part of the bottom wall of the middle rail protrudes upward along its length direction to form the first groove body. The middle part of the bottom wall of the inner rail protrudes upward along its length direction to form the second groove body. The gear mounting hole passes through the top wall and the side wall of the first groove body. The synchronous gear is installed in the gear mounting hole through a gear bracket.

3. The three-section load-bearing guide rail assembly according to claim 1, characterized in that: A plurality of upper pulleys are arranged at intervals on the upper sides of the inner sides of the two side walls of the middle rail, and the upper ends of the two side walls of the outer rail are provided with outer rail top edges extending inward, and the upper pulleys are slidably matched with the lower sides of the outer rail top edges.

4. The three-section load-bearing guide rail assembly according to claim 3, characterized in that: The upper side of the top edge of the inner rail is slidably matched with the upper pulley.

5. The three-section load-bearing guide rail assembly according to claim 4, characterized in that: The inner side of the bottom wall of the outer rail, the lower side of the top edge of the outer rail, the upper side of the top edge of the inner rail and the lower side of the top edge of the inner rail are respectively provided with convex rails along their length directions, and the upper pulley and the lower pulley are both provided with guide grooves, and the convex rails on the inner side of the bottom wall of the outer rail and the lower side of the top edge of the inner rail are slidably matched with the guide grooves of the lower pulley, and the convex rails on the lower side of the top edge of the outer rail and the upper side of the top edge of the inner rail are slidably matched with the guide grooves of the upper pulley.

6. The three-section load-bearing guide rail assembly according to claim 1, characterized in that: The middle rail is provided with a first buffer device, and the inner rail is provided with a second buffer device. The side wall of the middle rail is higher than the side wall of the inner rail, and the side wall of the outer rail is higher than the side wall of the middle rail. The first buffer device is fixed on the upper side of the side wall of the middle rail, and the second buffer device is fixed on the inner side of the bottom wall of the inner rail away from the first buffer device. A first push block is provided on the upper side of one side wall of the outer rail corresponding to the first buffer device, and a second push block is provided on the upper side of the other side wall of the outer rail corresponding to the second buffer device. When the middle rail moves outward to the point where the first push block pushes the first buffer device, the first buffer device decelerates the middle rail, and when the inner rail moves inward to the point where the second push block pushes the second buffer device, the second buffer device decelerates the inner rail.

7. The three-section load-bearing guide rail assembly according to claim 6, characterized in that: The first buffer device is installed at the rear of the middle rail, the triggering part of the first buffer device faces the front end of the middle rail, and the first push-stop member is installed at the front of the side wall on the corresponding side of the outer rail; the second buffer device is installed at the inner front of the inner rail, the triggering part of the second buffer device faces the rear end of the inner rail, and the second push-stop member is arranged at the rear of the side wall on the corresponding side.

8. The three-section load-bearing guide rail assembly according to any one of claims 4 to 6, characterized in that: A stop slope extending downward is arranged at the rear of the top edge of the outer rail, and the thickness of the stop slope increases from the front end to the rear end thereof, and the upper pulley on the rearmost side is squeezed when sliding to the stop slope.

9. The three-section load-bearing guide rail assembly according to claim 8, characterized in that: The bottom wall of the outer rail is provided with a slope groove that deepens backwards corresponding to the position where the lower pulley is received in the middle rail, and gravity guidance is generated when the lower pulley slides into the slope groove.

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