A heavy-duty buffer track that combines labor-saving design

Abstract

This utility model discloses a heavy-duty buffer rail that facilitates easy closing, comprising a lower fixed rail, a middle rail slidably mounted on the lower fixed rail, and an upper fixed rail slidably mounted on the middle rail. When the upper movable rail is extended or retracted, the middle rail can also be extended or retracted. The upper movable rail is equipped with a buffer, and the lower fixed rail is equipped with a driving component. When the upper movable rail is slid retracted to a certain position, the driving component triggers the buffer to automatically close the upper movable rail. The middle rail is also equipped with a roller, and the lower fixed rail has a groove. The bottom wall of the groove includes a first inclined surface that slopes downwards. When the middle rail is slid retracted until the roller rolls on the first inclined surface, the roller will roll downwards under gravity to automatically close the middle rail. Therefore, through the above design, only a single buffer is needed to achieve automatic buffer closure of the upper movable rail and the middle rail, resulting in low cost and a simple structure.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to a heavy-duty buffer track that is both easy to connect and labor-saving. Background Technology

[0002] Currently, heavy-duty tracks are widely used in accessories such as high-reach pull-out baskets for kitchen cabinets, high-reach rotating pull-out baskets, and narrow cabinets for wardrobes due to their excellent load-bearing capacity. In order to reduce the impact force when the pull-out basket or cabinet door is closed, a buffer is usually installed on the heavy-duty track; thus, when the pull-out basket or cabinet door is closed to a certain position, the buffer is activated and automatically and buffers the closing of the pull-out basket or cabinet door.

[0003] Heavy-duty rails are typically three-section rails. Due to their large size and heavy weight, when only a single buffer is installed on the upper rail, the spring force of the single buffer may not be able to pull the upper rail and the middle rail together simultaneously. Therefore, one or more additional buffers are required to pull the rail. This not only increases the cost, but also requires that the installation position of each buffer be very precise to prevent the problem of excessive local pressure caused by inconsistent buffer action. Utility Model Content

[0004] In order to overcome at least one of the defects mentioned in the prior art, the present invention provides a heavy-duty buffer track that is easy to close and saves effort, which can solve the problems mentioned in the background art, such as increased cost and asynchronous operation caused by the need to set multiple buffers.

[0005] The technical solution adopted by this utility model to solve its problem is: A heavy-duty, labor-saving, and shock-absorbing track includes: Lower fixed rail; The middle rail is slidably mounted on the lower fixed rail; The upper movable rail is slidably mounted on the middle rail; when the upper movable rail is slidably extended or retracted, the middle rail can be slidably extended or retracted. A buffer is provided on the upper movable rail; a driving component is provided on the lower fixed rail. When the upper movable rail is slidably retracted to a certain position, the driving component triggers the buffer to achieve automatic buffering and closing of the upper movable rail. The middle rail is also provided with rollers for supporting the upper movable rail. The rollers roll and abut against the upper movable rail and the lower fixed rail respectively. The lower fixed rail has a groove, and the bottom wall of the groove includes a first inclined surface that extends along the sliding retraction direction of the middle rail and is inclined downward. When the middle rail is driven to slide and retract until the roller rolls on the first inclined surface, the roller can roll downward along the first inclined surface under the action of gravity to realize the automatic closing of the middle rail.

[0006] As an optional implementation, the bottom wall of the groove further includes a second inclined surface that connects to the end of the first inclined surface and is inclined upward along the sliding retraction direction of the middle rail. When the roller abuts against the second inclined surface, it can be limited and fixed.

[0007] As an optional implementation, multiple grooves are provided, and the multiple grooves are arranged at intervals along the length and width directions of the lower fixed rail; multiple rollers are provided, and the number of rollers is not less than the number of grooves.

[0008] As an optional implementation, the buffer includes a housing, a transmission block, a damper, and a spring, wherein: The transmission block is slidably disposed within the housing and a portion of it protrudes from the housing; the driving member is used to abut against the portion of the transmission block protruding from the housing. Both the damper and the spring are disposed inside the housing. The fixed end of the damper and one end of the spring are fixed to the housing. The telescopic end of the damper and the other end of the spring are connected to the transmission block. When the upper movable rail is slid out until the driving member abuts the transmission block, the transmission block is limited. Then, pulling the upper movable rail out can simultaneously drive the other end of the spring and the extension end of the damper to extend. When the upper movable rail extends to a certain position, the transmission block rotates and disengages from the driving member. At the same time, the transmission block is limited. At this time, the spring is in a stretched state and the damper is fully reset. When the upper movable rail slides back until the driving member abuts the transmission block again, the driving member drives the transmission block to rotate and reset and disengage from the limit position. Under the elastic force of the spring, it can pull the transmission block to slide relative to the housing, and the transmission block synchronously compresses the extension end of the damper to achieve damping buffer.

[0009] As an optional implementation, a guide groove is provided inside the housing, and the transmission block includes a guide post slidably disposed within the guide groove, wherein: The guide groove includes a straight section and an arc-shaped section that connects to the end of the straight section. When the guide post slides from the straight section to the arc-shaped section, the transmission block rotates and abuts against the arc-shaped section through the guide post to achieve a limit. When the guide post is driven to slide from the arc-shaped section to the straight section, the transmission block rotates to reset and disengages from the limit.

[0010] As an optional implementation, the transmission block further includes a first protrusion and a second protrusion protruding from the housing, wherein: The first protrusion is positioned close to the guide post; The second protrusion is arranged at a distance from the first protrusion. The first protrusion is used to abut against the driving member when the upper movable rail slides out, and the second protrusion is used to abut against the driving member when the upper movable rail slides back.

[0011] As an optional implementation, the transmission block further includes a guide block slidably disposed within the straight section of the guide groove, with the second protrusion disposed close to the guide block.

[0012] As an optional implementation, the lower fixed rail is provided with a first rack extending along its length, and the middle rail is provided with a gear that meshes with the first rack to slide on the lower fixed rail; the upper movable rail is provided with a second rack that meshes with the gear to slide on the middle rail. The second rack and the first rack are arranged parallel to each other at an interval; when the upper movable rail is slid out or retracted, the middle rail can be slid out or retracted synchronously through the meshing transmission of the second rack, the gear and the first rack in sequence.

[0013] As an optional implementation, the middle rail is also provided with a plurality of rotatable first guide pulleys, all of which are in contact with the outer wall of the upper movable rail to guide the sliding of the upper movable rail.

[0014] As an optional implementation, the middle rail is also provided with a plurality of rotatable second guide pulleys, all of which are in contact with the outer wall of the lower fixed rail to guide the sliding of the middle rail.

[0015] In summary, the heavy-duty buffer track that provides a closing and labor-saving design has the following beneficial effects: (1) The heavy-duty buffer track of this utility model has a groove on the lower fixed rail. The bottom wall of the groove includes a first inclined surface that is inclined downward. When the roller rolls into the groove, the middle rail will slide downward along the first inclined surface under the action of gravity to achieve automatic closing. Therefore, only one buffer needs to be set on the upper movable rail to pull the upper movable rail and the middle rail to automatically buffer and close. The structure is simple and the cost is low. At the same time, it can avoid problems such as inconsistent action of multiple buffers and has high reliability.

[0016] (2) The heavy-duty buffer track of this utility model is meshed with the upper movable rail, the middle rail and the lower fixed rail through a gear and rack transmission structure. When the upper movable rail is driven to slide out or retract, the middle rail can be driven to slide out or retract simultaneously, thereby eliminating the mutual collision between the rails and effectively reducing the collision noise emitted by the rails when they are pulled out and retracted, while increasing the effective service life of the rails. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the state of the upper movable rail and the middle rail of the heavy-duty buffer track of this utility model when they are fully extended. Figure 2 This is a schematic diagram of the upper rail assembly in the heavy-duty buffer track of this utility model; Figure 3 for Figure 2 A structural diagram from another perspective; Figure 4 This is a partial structural schematic diagram of the upper rail assembly of this utility model; Figure 5 This is a schematic diagram of the middle rail assembly in the heavy-duty buffer track of this utility model; Figure 6 This is a schematic diagram of the lower rail assembly in the heavy-duty buffer track of this utility model; Figure 7 for Figure 6 A structural diagram from another perspective; Figure 8 for Figure 1 A cross-sectional schematic diagram; Figure 9 This is a schematic diagram of the state when the upper movable rail and the middle rail of the heavy-duty buffer track of this utility model are fully retracted. Figure 10 for Figure 9 A partial structural diagram.

[0018] The meanings of the reference numerals in the attached figures are as follows: 1. Upper rail assembly; 11. Upper movable rail; 12. Second rack; 13. Buffer; 131. Housing; 1311. Guide groove; 13111. Straight section; 13112. Arc section; 132. Transmission block; 1321. Guide post; 1322. First protrusion; 1323. Second protrusion; 1324. Guide block; 133. Spring; 134. Damper; 1341. Cylinder; 1342. Piston rod; 14. Abutment block; 2. Middle rail assembly; 21. Middle rail; 22. Gear; 23. Roller; 24. First guide pulley; 25. Second guide pulley; 26. Limiting block; 3. Lower rail assembly; 31. Lower fixed rail; 32. First rack; 33. Driving component; 34. Groove; 341. First inclined surface; 342. Second inclined surface. Detailed Implementation

[0019] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] Combination Figures 1 to 10 As shown, this application provides a heavy-duty buffer rail that is easy to close, including an upper rail assembly 1, a middle rail assembly 2, and a lower rail assembly 3. The upper rail assembly 1 includes an upper movable rail 11, the middle rail assembly 2 includes a middle rail 21, and the lower rail assembly 3 includes a lower fixed rail 31. The lower fixed rail 31 is typically fixed to a cabinet or pull-out basket. The middle rail 21 slides on the lower fixed rail 31, and the upper movable rail 11 slides on the middle rail 21. When the upper movable rail 11 is slid out or retracted, the middle rail 21 can also be slid out or retracted.

[0023] Preferably, an abutment block 14 is installed at the bottom of the upper movable rail 11, and a limit stop block 26 is installed on the middle rail 21. When the upper movable rail 11 is slid out, the middle rail 21 can be slid out simultaneously until the abutment block 14 abuts against the limit stop block 26. At this time, both the upper movable rail 11 and the middle rail 21 are limited and fixed, and the heavy-duty rail is in a fully extended state. Figure 1 and Figure 8 As shown.

[0024] In addition, the upper rail assembly 1 also includes a buffer 13 disposed on the upper movable rail 11, and a drive member 33 is provided on the lower fixed rail 31. When the upper movable rail 11 is slid back to a certain position, the drive member 33 can trigger the buffer 13 to achieve automatic buffering and closing of the upper movable rail 11.

[0025] The middle rail 21 is also provided with rollers 23 for supporting the upper movable rail 11. The rollers 23 roll and abut against the upper movable rail 11 and the lower fixed rail 31 respectively. The lower fixed rail 31 is provided with a groove 34. The bottom wall of the groove 34 includes a first inclined surface 341 that extends along the sliding retraction direction of the middle rail 21 and is inclined downward. When the middle rail 21 is driven to slide and retract until the rollers 23 roll on the first inclined surface 341, under the action of gravity, the rollers 23 can roll downward along the first inclined surface 341 to realize the automatic closing of the middle rail 21.

[0026] Therefore, by opening a groove 34 on the lower fixed rail 31, the bottom wall of the groove 34 includes a first inclined surface 341 that is inclined downward. When the roller 23 rolls into the groove 34, the middle rail 21 will slide downward along the first inclined surface 341 under the action of gravity to achieve automatic closing. Therefore, only one buffer 13 needs to be set on the upper movable rail 11 to pull the upper movable rail 11 and the middle rail 21 to automatically buffer and close. The structure is simple and the cost is low. At the same time, it can avoid problems such as inconsistent operation of multiple buffers 13, and the reliability is high.

[0027] Preferably, the bottom wall of the groove 34 further includes a second inclined surface 342 that connects to the end of the first inclined surface 341 and is inclined upward along the sliding retraction direction of the middle rail 21. When the roller 23 rolls to contact the second inclined surface 342, it can be limited and fixed.

[0028] In this embodiment, multiple grooves 34 are provided, and the multiple grooves 34 are arranged at intervals along the length and width directions of the lower fixed rail 31; multiple rollers 23 are also provided, and the number of rollers 23 is greater than the number of grooves 34. Thus, through the rolling cooperation of multiple rollers 23 and multiple grooves 34, it can be ensured that the middle rail 21 slides downward evenly to achieve automatic closing and prevent the middle rail 21 from tilting to one side.

[0029] See Figure 4 The buffer 13 includes a housing 131, a transmission block 132, a damper 134, and a spring 133. The transmission block 132 is slidably disposed within the housing 131, with a portion protruding from the housing 131. The driving member 33 is used to abut against the protruding portion of the transmission block 132. Both the damper 134 and the spring 133 are disposed within the housing 131. The fixed end of the damper 134 and one end of the spring 133 are fixed to the housing 131. The telescopic end of the damper 134 and the other end of the spring 133 are connected to the transmission block 132. Preferably, the damper 134 is a hydraulic cylinder, with the cylinder body 1341 fixed within the housing 131, and the piston rod 1342 connected to the transmission block 132.

[0030] Therefore, when the upper movable rail 11 is slid out until the driving member 33 abuts the transmission block 132, the transmission block 132 is limited by the driving member 33. Then, when the upper movable rail 11 continues to slide out, the other end of the spring 133 and the piston rod 1342 can be extended at the same time. When the upper movable rail 11 extends to a certain position, the transmission block 132 rotates and disengages from the driving member 33. At the same time, the transmission block 132 is limited. At this time, the spring 133 is in a stretched state and the piston rod 1342 is fully reset. When the upper movable rail 11 slides back until the drive member 33 abuts against the transmission block 132 again, the drive member 33 drives the transmission block 132 to rotate and reset and disengage from the limit. Under the elastic force of the spring 133, it can pull the transmission block 132 to slide relative to the housing 131, and the transmission block 132 synchronously compresses the piston rod 1342 to achieve damping buffer.

[0031] Specifically, the housing 131 has a guide groove 1311, and the transmission block 132 includes a guide post 1321 that slides in the guide groove 1311. The transmission block 132 is slidably mounted on the housing 131 through the sliding engagement of the guide post 1321 and the guide groove 1311. The guide groove 1311 includes a horizontally arranged straight section 13111 and an arc-shaped section 13112 that connects to the end of the straight section 13111. When the guide post 1321 slides from the straight section 13111 to the arc-shaped section 13112, the transmission block 1321 slides from the straight section 13111 to the arc-shaped section 13112. When segment 13112 is in place, the transmission block 132 rotates. Under the tension of the spring 133, the guide post 1321 abuts against the arc segment 13112 to achieve a limit. At this time, the transmission block 132 is in a locked state. When the guide post 1321 is driven to slide from the arc segment 13112 to the straight segment 13111, the transmission block 132 rotates back to its original position and disengages from the limit. At this time, under the tension of the spring 133, it will drive the transmission block 132 to slide back to its original position and compress the piston rod 1342 to achieve damping and buffering.

[0032] More specifically, the transmission block 132 further includes a first protrusion 1322 and a second protrusion 1323 protruding from the housing 131. The first protrusion 1322 is disposed near the guide post 1321; the second protrusion 1323 is arranged at a distance from the first protrusion 1322. The first protrusion 1322 is used to abut against the driving member 33 when the upper movable rail 11 slides out, and the second protrusion 1323 is used to abut against the driving member 33 when the upper movable rail 11 slides back. Preferably, the driving member 33 is a driving block mounted on the lower fixed rail 31.

[0033] Therefore, when the upper movable rail 11 slides out, the drive block abuts against the first protrusion 1322, and the guide post 1321 slides along the straight section 13111 until the guide post 1321 slides from the straight section 13111 to the arc section 13112. At this time, the first protrusion 1322 rotates and disengages from the drive block, and the transmission block 132 is restricted. At this time, the upper movable rail 11 continues to slide out until it is fully extended. Conversely, when the upper movable rail 11 slides back, the drive block abuts against the second protrusion 1323 and drives the guide post 1321 on the transmission block 132 to slide from the arc section 13112 to the straight section 13111. At this time, the transmission block 132 resets and rotates and is released from restriction. Under the elastic force of the spring 133, it will drive the transmission block 132 to compress the piston rod 1342 to achieve damping and buffering. Furthermore, to ensure that the second protrusion 1323 does not rotate at a large angle when the transmission block 132 rotates, the transmission block 132 also includes a guide block 1324 slidably disposed within the straight section 13111, and the second protrusion 1323 is positioned close to the guide block 1324. Thus, by limiting the movement between the guide block 1324 and the straight section 13111, large-angle rotation of the second protrusion 1323 can be prevented, thereby ensuring that the drive block can abut against the second protrusion 1323 when the upper movable rail 11 slides back.

[0034] See also Figure 2 , Figure 5-6 as well as Figure 8 The lower fixed rail 31 is also provided with a first rack 32 extending along its length direction, and the middle rail 21 is provided with a gear 22 that meshes with the first rack 32 to slide on the lower fixed rail 31; the upper movable rail 11 is provided with a second rack 12 that meshes with the gear 22 to slide on the middle rail 21; wherein the second rack 12 and the first rack 32 are arranged parallel to each other at an interval; when the upper movable rail 11 is driven to slide out or retract, the middle rail 21 can be driven to slide out or retract synchronously through the meshing transmission of the second rack 12, the gear 22 and the first rack 32 in sequence.

[0035] Therefore, the upper movable rail 11, the middle rail 21 and the lower fixed rail 31 are meshed through a gear and rack transmission structure. When the upper movable rail 11 is driven to slide out or retract, the middle rail 21 can be driven to slide out or retract simultaneously, thereby eliminating the mutual collision between the rails and effectively reducing the collision noise emitted by the rails when they are pulled out and retracted, while also increasing the effective service life of the rails.

[0036] In this embodiment, the first rack 32 is provided in two parts and is located on both sides of the upper movable rail 11 in the width direction; the gear 22 is provided in two parts and is located on both sides of the middle rail 21 in the width direction; and the second rack 12 is provided in two parts and is located on both sides of the lower fixed rail 31 in the width direction. By providing two sets of gear and rack transmission structures, the sliding of the upper movable rail 11 and the middle rail 21 is more stable and smooth.

[0037] Furthermore, the middle rail 21 is provided with a plurality of rotatable first guide pulleys 24 along its length direction. The plurality of first guide pulleys 24 roll against the outer wall of the upper movable rail 11 to guide the sliding of the upper movable rail 11. The middle rail 21 is also provided with a plurality of rotatable second guide pulleys 25 along its length direction. The plurality of second guide pulleys 25 roll against the outer wall of the lower fixed rail 31 to guide the sliding of the middle rail 21.

[0038] Therefore, by setting up a number of first guide pulleys 24 and a number of second guide pulleys 25, the sliding extension and retraction of the upper movable rail 11 and the middle rail 21 can be guided, thereby improving their sliding stability.

[0039] In summary, the heavy-duty buffer track that provides a closing and labor-saving design has the following beneficial effects: (i) The heavy-duty buffer track of this utility model has a groove 34 on the lower fixed rail 31. The bottom wall of the groove 34 includes a first inclined surface 341 that is inclined downward. When the roller 23 rolls into the groove 34, the middle rail 21 will slide downward along the first inclined surface 341 under the action of gravity to achieve automatic closing. Therefore, only one buffer 13 needs to be set on the upper movable rail 11 to pull the upper movable rail 11 and the middle rail 21 to automatically buffer and close. The structure is simple and the cost is low. At the same time, it can avoid problems such as inconsistent operation of multiple buffers 13, and has high reliability.

[0040] (ii) The heavy-duty buffer track of this utility model is meshed with the upper movable rail 11, the middle rail 21 and the lower fixed rail 31 through a gear and rack transmission structure. When the upper movable rail 11 is driven to slide out or retract, the middle rail 21 can be driven to slide out or retract simultaneously, thereby eliminating the mutual collision between the tracks and effectively reducing the collision noise emitted by the track when it is pulled out and retracted, while increasing the effective service life of the track.

[0041] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A heavy-duty buffer track that requires minimal effort to close, characterized in that, include: Lower fixed rail; The middle rail is slidably mounted on the lower fixed rail; The upper movable rail is slidably mounted on the middle rail; when the upper movable rail is slidably extended or retracted, the middle rail can be slidably extended or retracted. A buffer is provided on the upper movable rail; a driving component is provided on the lower fixed rail. When the upper movable rail is slidably retracted to a certain position, the driving component triggers the buffer to achieve automatic buffering and closing of the upper movable rail. The middle rail is also provided with rollers for supporting the upper movable rail. The rollers are respectively rolled on the upper movable rail and the lower fixed rail. The lower fixed rail has a groove, and the bottom wall of the groove includes a first inclined surface that extends along the sliding retraction direction of the middle rail and is inclined downward. When the middle rail is driven to slide and retract until the roller rolls on the first inclined surface, the roller can roll downward along the first inclined surface under the action of gravity to realize the automatic closing of the middle rail.

2. The heavy-duty buffer track according to claim 1, characterized in that, The bottom wall of the groove also includes a second inclined surface that connects to the end of the first inclined surface and is inclined upward along the sliding retraction direction of the middle rail. When the roller abuts against the second inclined surface, it can be limited and fixed.

3. The heavy-duty buffer track according to claim 1, characterized in that, The grooves are provided in multiple ways, and the multiple grooves are arranged at intervals along the length and width directions of the lower fixed rail; the rollers are provided in multiple ways, and the number of rollers is not less than the number of grooves.

4. The heavy-duty buffer track according to any one of claims 1-3, characterized in that, The buffer includes a housing, a transmission block, a damper, and a spring, wherein: The transmission block is slidably disposed within the housing and a portion of it protrudes from the housing; the driving member is used to abut against the portion of the transmission block protruding from the housing. Both the damper and the spring are disposed inside the housing. The fixed end of the damper and one end of the spring are fixed to the housing. The telescopic end of the damper and the other end of the spring are connected to the transmission block. When the upper movable rail is slid out until the driving member abuts the transmission block, the transmission block is limited. Then, pulling the upper movable rail out can simultaneously drive the other end of the spring and the extension end of the damper to extend. When the upper movable rail extends to a certain position, the transmission block rotates and disengages from the driving member. At the same time, the transmission block is limited. At this time, the spring is in a stretched state and the damper is fully reset. When the upper movable rail slides back until the driving member abuts the transmission block again, the driving member drives the transmission block to rotate and reset and disengage from the limit position. Under the elastic force of the spring, it can pull the transmission block to slide relative to the housing, and the transmission block synchronously compresses the extension end of the damper to achieve damping buffer.

5. The heavy-duty buffer track according to claim 4, characterized in that, The housing has a guide groove, and the transmission block includes a guide post that slides within the guide groove, wherein: The guide groove includes a straight section and an arc-shaped section that connects to the end of the straight section. When the guide post slides from the straight section to the arc-shaped section, the transmission block rotates and abuts against the arc-shaped section through the guide post to achieve a limit. When the guide post is driven to slide from the arc-shaped section to the straight section, the transmission block rotates to reset and disengages from the limit.

6. The heavy-duty buffer track according to claim 5, characterized in that, The transmission block further includes a first protrusion and a second protrusion protruding from the housing, wherein: The first protrusion is positioned close to the guide post; The second protrusion is arranged at a distance from the first protrusion. The first protrusion is used to abut against the driving member when the upper movable rail slides out, and the second protrusion is used to abut against the driving member when the upper movable rail slides back.

7. The heavy-duty buffer track according to claim 6, characterized in that, The transmission block also includes a guide block that slides within the straight section of the guide groove, and the second protrusion is positioned close to the guide block.

8. The heavy-duty buffer track according to any one of claims 1-3, characterized in that, The lower fixed rail is provided with a first rack extending along its length direction, and the middle rail is provided with a gear that meshes with the first rack to slide on the lower fixed rail; the upper movable rail is provided with a second rack that meshes with the gear to slide on the middle rail. The second rack and the first rack are arranged parallel to each other at an interval; when the upper movable rail is slid out or retracted, the middle rail can be slid out or retracted synchronously through the meshing transmission of the second rack, the gear and the first rack in sequence.

9. The heavy-duty buffer track according to claim 8, characterized in that, The middle rail is also provided with several rotatable first guide pulleys, and the several first guide pulleys are in contact with the outer wall of the upper movable rail to guide the sliding of the upper movable rail.

10. The heavy-duty buffer track according to claim 8, characterized in that, The middle rail is also provided with several rotatable second guide pulleys, and the several second guide pulleys are in contact with the outer wall of the lower fixed rail to guide the sliding of the middle rail.

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