A continuous assembly conveying track for drawer slides

By designing a continuous assembly conveyor track for drawer slides and employing lubrication and stabilization mechanisms, the problems of low efficiency and lubricant drying in traditional assembly methods have been solved, achieving efficient and stable slide assembly and lubrication, thereby improving production efficiency and equipment reliability.

CN224590027UActive Publication Date: 2026-08-04LIANXIANG HOME (XUZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
LIANXIANG HOME (XUZHOU) CO LTD
Filing Date
2025-09-29
Publication Date
2026-08-04

AI Technical Summary

Technical Problem

Traditional drawer slide assembly and transmission methods are inefficient, manual operation leads to component positioning deviations, making it difficult to adapt to continuous mass production, and the drying of lubricating oil increases metal friction on the slide surface.

Method used

A continuous assembly of drawer slide rails was designed, including a lubrication mechanism, a stabilizing mechanism, and a retraction mechanism. The lubricating oil is precisely supplied through an oil tank, a micro oil pump, and an oil delivery pipe. Combined with buffer springs and rubber pads, the stability of the equipment is improved, ensuring the stability of the conveying process and the lubrication effect.

Benefits of technology

It improves assembly efficiency, reduces manual intervention, ensures accurate component alignment, reduces transmission losses, extends equipment lifespan, and enhances equipment stability and lubrication.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of accessory production equipment discloses a kind of conveying tracks of drawer slide rail continuous assembly, including main body, the top of main body is fixedly connected with multiple protective cover, the inner wall of multiple protective cover is fixedly connected with internal and external gear, the outside of internal and external gear is provided with lubricating mechanism, the bottom of main body is provided with firm mechanism, the outside of main body is provided with contraction mechanism, the outer wall of multiple protective cover is all communicated with linkage pipe, the lubricating mechanism includes oil tank, the bottom of oil tank is fixedly connected in the top of main body, the top of oil tank is provided with oil filler neck. In the utility model, equipment lubrication demand is satisfied by oil tank, inject by oil filler neck, filter screen filters impurity, cover plate seals oil filler neck, blowdown valve discharges sediment in tank, oil extraction pipe extracts lubricating oil, and it is transported to linkage pipe inside by oil pipe, ensure that oil tank is stable, improve the reliability of equipment.
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Description

Technical Field

[0001] This utility model relates to the field of accessory production equipment technology, and in particular to a conveyor track for continuous assembly of drawer slides. Background Technology

[0002] The conveyor track for continuous assembly of drawer slides adopts a high-precision guide rail structure, which can stably transport slide rail components. Equipped with positioning sensors to ensure accurate alignment of components, it can adjust the conveyor speed according to the assembly rhythm, adapt to the assembly requirements of different specifications of slide rails, and effectively reduce manual intervention. With these advantages, the conveyor track can significantly improve the assembly efficiency of drawer slides, reduce component loss during transmission, help the production line achieve automated continuous operation, and provide reliable transmission guarantee for the mass production of high-quality slide rails.

[0003] Traditional drawer slide assembly and conveying methods mostly rely on manual pushing and conveyor belts. The slide components are placed one by one on the conveyor path by hand, and the position transfer is achieved by simple mechanical transmission. The main reliance is on manual judgment and adjustment of component positions. This method has the problem of low efficiency, manual operation leads to component positioning deviation, and it is difficult to adapt to the needs of continuous mass production. The high labor intensity causes assembly errors due to fatigue.

[0004] Existing conveyor rails use automated drive devices, along with positioning sensors and guide mechanisms. They control the conveying rhythm through preset programs to achieve automatic delivery and accurate alignment of the slide rail components. They can automatically adjust the conveying speed according to the assembly steps. However, there are still problems such as the increased number of conveying and sliding operations, the gradual drying of the pre-applied lubricant, and the increased metal friction on the slide rail surface. To address these issues, a conveyor rail for continuous assembly of drawer slide rails is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a continuously assembled drawer slide rail to improve the problem in the prior art where the number of sliding operations increases and the pre-applied lubricating oil gradually dries, leading to increased metal friction on the slide surface.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a conveyor track for continuous assembly of drawer slides, comprising a main body, a plurality of protective covers fixedly connected to the top of the main body, internal and external gears fixedly connected to the inner walls of the plurality of protective covers, a lubrication mechanism provided on the outside of the internal and external gears, a stabilizing mechanism provided at the bottom of the main body, a retraction mechanism provided on the outside of the main body, and a connecting pipe connected to the outer walls of the plurality of protective covers.

[0007] The lubrication mechanism includes an oil reservoir, the bottom of which is fixedly connected to the top of the main body. The top of the oil reservoir has an oil filling port, the inner wall of which is fixedly connected to a filter screen and a cover plate. A drain valve is fixedly connected to the left side of the oil reservoir, and an oil extraction pipe is connected to the front of the oil reservoir. A micro oil pump is fixedly connected to the outer wall of the oil extraction pipe, and an oil delivery pipe is fixedly connected to the output end of the micro oil pump. A fixing component is provided on the outside of the oil reservoir.

[0008] As a further description of the above technical solution:

[0009] The stabilizing mechanism includes multiple stabilizing plates, the tops of which are fixedly connected to the bottom of the main body. The bottom of the main body has multiple threaded grooves. The bottoms of the multiple stabilizing plates are fixedly connected to multiple buffer springs. The outer walls of the multiple buffer springs are fixedly connected to a base plate. The tops of the multiple base plates are fixedly connected to threaded columns. The bottoms of the multiple base plates are fixedly connected to rubber pads.

[0010] As a further description of the above technical solution:

[0011] The shrinking mechanism includes two fixing bars, the outer walls of which are fixedly connected to the outer wall of the main body. The bottom of the main body is fixedly connected to a placement plate. The top of the placement plate has two sliding grooves, the inner walls of which are slidably connected to lifting rods. The top ends of the two lifting rods are fixedly connected to lifting plates.

[0012] As a further description of the above technical solution:

[0013] The fixing assembly includes two fixing plates, each fixedly connected to the left and right sides of the oil tank on an adjacent side. Bolts are fixedly connected to the outer walls of the two fixing plates, and nuts are threaded onto the outer walls of the two bolts.

[0014] As a further description of the above technical solution:

[0015] The outer wall of the oil pipeline is fixedly connected to the left end of the connecting pipe, and a motor is fixedly connected to the right end of the connecting pipe.

[0016] As a further description of the above technical solution:

[0017] A locator is fixedly connected to the top of the protective cover, and a stop plate is fixedly connected to the top of the main body.

[0018] As a further description of the above technical solution:

[0019] A support frame is fixedly connected to the top of the main body, and two sliding columns are fixedly connected to the front side of the support frame.

[0020] As a further description of the above technical solution:

[0021] Both of the sliding columns are fixedly connected to the outer walls of each other with pushers, and both of the sliding columns are fixedly connected to the outer walls of each other with pressers.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the lubrication mechanism can effectively store sufficient lubricating oil through the oil storage tank to meet the lubrication needs of the equipment. The oil is injected through the top filling port. During the process, the filter screen on the inner wall can accurately filter impurities. The cover plate seals the filling port to prevent dust and impurities from falling in. At the same time, the drain valve can periodically discharge the sediment in the tank to ensure the quality of the lubricating oil. The oil extraction pipe, together with the micro oil pump, draws the lubricating oil from the tank and delivers it to the inside of the connecting pipe through the oil delivery pipe. Lubrication is achieved on demand through the small opening inside the connecting pipe. Meanwhile, the fixing plate fixes the oil storage tank to ensure the stability of the oil storage tank and improve the reliability of the equipment.

[0024] 2. In this utility model, the bottom buffer spring can effectively absorb the vibration generated during operation, reduce equipment shaking, and avoid displacement and loosening of parts caused by vibration. At the same time, the base plate, as a supporting foundation, together with the bottom rubber pad, increases the friction of the contact surface and further prevents slippage. The threaded connection structure ensures that all components are tightly fixed, forming a complete and stable system. Regardless of whether the equipment is in a static or dynamic operating state, it can continuously provide balanced support, ensure the stable operation of the main body, and improve the safety of the equipment. Attached Figure Description

[0025] Figure 1 A perspective view of a continuously assembled drawer slide rail according to this utility model;

[0026] Figure 2 This is a front view of a continuously assembled drawer slide rail according to the present invention.

[0027] Figure 3 This is a top view of a continuously assembled drawer slide rail according to the present invention.

[0028] Figure 4 for Figure 3 Enlarged view of point A;

[0029] Figure 5 This is a cross-sectional view of the main body of a continuously assembled drawer slide rail according to the present invention.

[0030] Legend:

[0031] 1. Main body; 2. Protective cover; 3. Internal and external gears; 4. Lubrication mechanism; 401. Oil reservoir; 402. Filler port; 403. Filter screen; 404. Cover plate; 405. Drain valve; 406. Oil suction pipe; 407. Miniature oil pump; 408. Oil delivery pipe; 409. Fixing components; 4091. Fixing plate; 4092. Bolt; 4093. Nut; 5. Stabilizing mechanism; 501. Stable plate 502. Threaded column; 503. Threaded groove; 504. Buffer spring; 505. Base plate; 506. Rubber pad; 6. Retraction mechanism; 601. Lifting rod; 602. Lifting plate; 603. Placement plate; 604. Fixing strip; 605. Slide groove; 7. Linkage pipe; 8. Motor; 9. Positioner; 10. Stop plate; 11. Support frame; 12. Pusher; 13. Slide column; 14. Pressing machine. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0033] Reference Figure 1 , Figure 2 and Figure 4 This utility model provides an embodiment of a continuously assembled drawer slide rail, comprising a main body 1, whose main function is to support the main components. Multiple protective covers 2 are fixedly connected to the top of the main body 1, whose main function is to protect the internal components. Internal and external gears 3 are fixedly connected to the inner walls of the multiple protective covers 2, whose main function is to transport the drawer slide rails. A lubrication mechanism 4 is provided on the outside of the internal and external gears 3. A stabilizing mechanism 5 is provided at the bottom of the main body 1. A retraction mechanism 6 is provided on the outside of the main body 1. The retraction mechanism 6 includes two fixing strips 604, the outer walls of which are fixedly connected to the outer wall of the main body 1. A placement plate 60 is fixedly connected to the bottom of the main body 1. 3. Its main function is to support the lifting rod 601. The top of the placement plate 603 has two sliding grooves 605. Its main function is to limit the lifting rod 601 to only follow the length of the sliding groove 605 through the sliding fit between the inner wall and the lifting rod 601. The inner walls of the two sliding grooves 605 are slidably connected to the lifting rod 601. Its main function is to raise the lifting rod 601. The top ends of the two lifting rods 601 are fixedly connected to the lifting plate 602. Its main function is to convert the dispersed force of the lifting rod 601 into a stable supporting force for the component. The outer walls of the multiple protective covers 2 are all connected to the linkage pipe 7. Its main function is to allow lubricating oil to flow into the internal and external gears 3 through the small internal opening.

[0034] The lubrication mechanism 4 includes an oil reservoir 401, whose main function is to store lubricating oil to provide a medium reserve for the entire mechanism. The bottom of the oil reservoir 401 is fixedly connected to the top of the main body 1. The top of the oil reservoir 401 has an oil filling port 402, whose main function is to replenish the oil reservoir 401 with lubricating oil. A filter screen 403 is fixedly connected to the inner wall of the oil filling port 402, whose main function is to filter the injected lubricating oil and intercept impurities. A cover plate 404 is fixedly connected to the inner wall of the oil filling port 402, whose main function is to seal the oil filling port 402. A drain valve is fixedly connected to the left side of the oil reservoir 401. 405, its main function is to discharge sediment and deteriorated old oil at the bottom of oil storage tank 401. The front side of oil storage tank 401 is connected to oil extraction pipe 406, whose main function is to guide the lubricating oil in oil storage tank 401 to micro oil pump 407, providing a path for the transportation process. The outer wall of oil extraction pipe 406 is fixedly connected to micro oil pump 407, whose main function is to pressurize the lubricating oil and transport it to the parts that need lubrication through oil delivery pipe 408. The output end of micro oil pump 407 is fixedly connected to oil delivery pipe 408, whose main function is to directly guide clean lubricating oil to the parts that need lubrication, realizing fixed-point and quantitative lubrication. The outside of oil storage tank 401 is provided with fixing component 409.

[0035] The fixing component 409 includes two fixing plates 4091, whose main function is to connect to the oil tank 401 on the left and right sides, thereby increasing the contact area between the oil tank 401 and the main body 1 and distributing the force. The adjacent sides of the two fixing plates 4091 are fixedly connected to the left and right sides of the oil tank 401. Bolts 4092 are fixedly connected to the outer walls of the two fixing plates 4091, whose main function is to lock the fixing plates 4091 and the main body 1 through threaded connection, preventing the oil tank 401 from loosening and shifting during equipment operation. Nuts 4093 are threadedly connected to the outer walls of the two bolts 4092, whose main function is to fix the bolts 4092 and prevent the bolts 4092 from coming off.

[0036] Specifically, the oil storage tank 401 stores lubricating oil to provide a medium reserve for the entire mechanism. Simultaneously, the oil filling port 402 at the top of the oil storage tank 401 is used to replenish lubricating oil into the tank. A filter screen 403 filters the injected lubricating oil, intercepting impurities and achieving integrated refueling. The oil filling port 402 is sealed by a cover plate 404 on the inner wall of the filler. Meanwhile, a drain valve 405 is used to discharge sediment and deteriorated old oil from the bottom of the oil storage tank 401. The lubricating oil in the oil storage tank 401 is guided to the micro oil pump 407 through the oil extraction pipe 406 at the front of the tank, providing a path for the transportation process. The oil extraction pipe 406... The miniature oil pump 407 on the outer wall of 06 pressurizes the lubricating oil and delivers it to the parts that need lubrication through the oil delivery pipe 408. The oil delivery pipe 408 directly guides the clean lubricating oil to the parts that need lubrication, realizing fixed-point and quantitative lubrication. It is connected to the oil storage tank 401 through two fixing plates 4091, which increases the contact area between the oil storage tank 401 and the main body 1 and distributes the force. At the same time, the bolts 4092 on the outer wall of the two fixing plates 4091 lock the fixing plates 4091 and the main body 1 through threaded connection, preventing the oil storage tank 401 from loosening and shifting during equipment operation. The bolts 4092 are fixed with nuts 4093 to prevent the bolts 4092 from coming off, thus achieving a stable fixation.

[0037] Reference Figure 2 , Figure 3 and Figure 5 The stabilizing mechanism 5 includes multiple stabilizing plates 501, whose main function is to increase the force-bearing area at the bottom of the main body 1. The tops of the multiple stabilizing plates 501 are fixedly connected to the bottom of the main body 1. The bottom of the main body 1 has multiple threaded grooves 503, whose main function is to cooperate with the threaded posts 502 on the top of the base plate 505 for fixation. The bottoms of the multiple stabilizing plates 501 are fixedly connected to multiple buffer springs 504, whose main function is to absorb impact force through deformation, reduce the transmission of vibration to the main body 1, and play a shock-absorbing and buffering role. The outer wall of the spring 504 is fixedly connected to the base plate 505, which mainly enhances the stability of the overall support. The top of the multiple base plates 505 is fixedly connected to the threaded post 502, which mainly adjusts the height of each base plate 505 individually by adjusting the screw depth of the threaded post 502 and the threaded groove 503 to adapt to uneven placement surfaces and ensure that the main body 1 is level. The bottom of the multiple base plates 505 is fixedly connected to the rubber pad 506, which mainly prevents the base plate 505 from sliding on the placement surface by the high friction of the rubber.

[0038] Specifically, multiple stabilizing plates 501 expand the bearing area at the bottom of the main body 1, preventing pressure from concentrating in a localized area. Simultaneously, the threaded groove 503 at the bottom of the main body 1 engages with the threaded post 502 at the top of the base plate 505 for fixation. Buffer springs 504 absorb impact through deformation, reducing vibration transmission to the main body 1 and providing shock absorption. Furthermore, the base plate 505 on the outer wall of the multiple buffer springs 504 enhances the overall stability of the support. The height of each base plate 505 can be individually adjusted by changing the screw depth of the threaded post 502 and the threaded groove 503, adapting to uneven surfaces and ensuring the main body 1 is level. Additionally, the rubber pads 506 at the bottom of the multiple base plates 505 prevent the base plates 505 from sliding on the surface through high friction, avoiding wear caused by hard contact between the base plates 505 and the surface.

[0039] Reference Figure 1 , Figure 2 and Figure 3 The outer wall of the oil pipe 408 is fixedly connected to the left end of the connecting pipe 7. The right end of the connecting pipe 7 is fixedly connected to the motor 8, whose main function is to drive the internal and external gears 3 to rotate and convey the slide rail. The top of the protective cover 2 is fixedly connected to the positioner 9, whose main function is to realize the closed-loop control of the internal and external gears 3 through the feedback signal of the positioner 9. The top of the main body 1 is fixedly connected to the stop plate 10, whose main function is to stop the conveying and wait for the pusher 12 to push. The top of the main body 1 is fixedly connected to the support frame 11, whose main function is to support the other components. The front side of the support frame 11 is fixedly connected to two sliding columns 13, whose main function is to limit the movement trajectory of the pusher 12 and the presser 14 to avoid movement deviation. The outer walls of the two sliding columns 13 are fixedly connected to the pusher 12, whose main function is to push the product on the stop plate 10. The outer walls of the two sliding columns 13 are fixedly connected to the presser 14, whose main function is to apply pressure to the target object and complete the pressing and clamping action.

[0040] Specifically, the motor 8 at the right end of the linkage pipe 7 drives the internal and external gears 3 to rotate, thus conveying the slide rail. At the same time, the signal feedback from the positioner 9 on the top of the protective cover 2 realizes closed-loop control of the movement of the internal and external gears 3. The stop plate 10 is used to realize the product to be conveyed and pushed by the pusher 12. The support frame 11 is used to support the other components. At the same time, the two sliding columns 13 on the front side of the support frame 11 limit the movement trajectory of the pusher 12 and the presser 14 to prevent the movement deviation. The pusher 12 on the outer wall of the two sliding columns 13 pushes the product on the stop plate 10. At the same time, the presser 14 on the outer wall of the two sliding columns 13 applies pressure to the target object to complete the pressing and clamping action, realizing the operation of the equipment.

[0041] Working principle: First, the lubrication mechanism 4 uses the oil storage tank 401 as a lubrication storage unit, which can effectively store sufficient lubricating oil to meet the lubrication needs of the equipment. When refilling is required, external lubricating oil is injected through the top refill port 402. During the process, the filter screen 403 on the inner wall can filter impurities to prevent contaminants from entering the oil tank and affecting the lubrication effect. The cover plate 404 seals the refill port 402 when not refilling to prevent dust and impurities from falling in. At the same time, the drain valve 405 on the left side of the oil storage tank 401 can periodically drain the oil and impurities deposited in the tank to ensure the quality of the lubricating oil. The oil extraction pipe 406 on the front side, together with the micro oil pump 407, can efficiently extract the lubricating oil in the tank and deliver it to the inside of the connecting pipe 7 through the oil delivery pipe 408. Lubrication is achieved on demand through the small opening inside the connecting pipe 7. At the same time, the fixing component 409 fixes the oil storage tank 401 through the fixing plate 4091 to ensure that the entire lubrication supply process is stable and reliable, providing a basic guarantee for continuous lubrication and improving the service life of the equipment.

[0042] Furthermore, the stabilizing mechanism 5 acts directly on the bottom of the main body 1 through the stabilizing plate 501. The buffer spring 504 at the bottom can effectively absorb the vibration generated during operation, reduce equipment shaking, and prevent displacement and loosening of parts caused by vibration. At the same time, the base plate 505 serves as a supporting foundation, and together with the rubber pad 506 at the bottom, it increases the friction of the contact surface, further preventing slippage. Meanwhile, the rubber material can also buffer external impacts and improve overall stability. At the same time, the threaded column 502 and threaded groove 503 ensure that all components are tightly fixed, forming a complete stable system. Regardless of whether the equipment is in a static or dynamic operating state, it can continuously provide balanced support, ensure the stable operation of the main body 1, and improve the stability of the equipment.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A continuous assembly conveyor track for drawer slides, comprising a main body (1), characterized in that: The top of the main body (1) is fixedly connected to multiple protective covers (2), and the inner walls of the multiple protective covers (2) are fixedly connected to internal and external gears (3). The external side of the internal and external gears (3) is provided with a lubrication mechanism (4). The bottom of the main body (1) is provided with a stabilizing mechanism (5). The external side of the main body (1) is provided with a shrinking mechanism (6). The outer walls of the multiple protective covers (2) are connected to a connecting pipe (7). The lubrication mechanism (4) includes an oil storage tank (401), the bottom of which is fixedly connected to the top of the main body (1). An oil filling port (402) is provided on the top of the oil storage tank (401). A filter screen (403) is fixedly connected to the inner wall of the oil filling port (402). A cover plate (404) is fixedly connected to the inner wall of the oil filling port (402). A drain valve (405) is fixedly connected to the left side of the oil storage tank (401). An oil extraction pipe (406) is connected to the front side of the oil storage tank (401). A micro oil pump (407) is fixedly connected to the outer wall of the oil extraction pipe (406). An oil delivery pipe (408) is fixedly connected to the output end of the micro oil pump (407). A fixing component (409) is provided on the outside of the oil storage tank (401).

2. The continuous assembly conveyor track for drawer slides of claim 1, wherein: The stabilizing mechanism (5) includes multiple stabilizing plates (501), the tops of which are fixedly connected to the bottom of the main body (1). The bottom of the main body (1) has multiple threaded grooves (503). The bottoms of the multiple stabilizing plates (501) are fixedly connected to multiple buffer springs (504). The outer walls of the multiple buffer springs (504) are fixedly connected to a base plate (505). The tops of the multiple base plates (505) are fixedly connected to threaded columns (502), and the bottoms of the multiple base plates (505) are fixedly connected to rubber pads (506).

3. The continuous assembly conveyor track for drawer slides of claim 1, wherein: The retraction mechanism (6) includes two fixing bars (604), the outer walls of the two fixing bars (604) are fixedly connected to the outer wall of the main body (1), the bottom of the main body (1) is fixedly connected to a placement plate (603), the top of the placement plate (603) has two sliding grooves (605), the inner walls of the two sliding grooves (605) are slidably connected to lifting rods (601), and the top ends of the two lifting rods (601) are fixedly connected to lifting plates (602).

4. The continuous assembly conveyor track for drawer slides of claim 1, wherein: The fixing assembly (409) includes two fixing plates (4091), with each of the two fixing plates (4091) fixedly connected to the left and right sides of the oil tank (401) on an adjacent side. Bolts (4092) are fixedly connected to the outer walls of the two fixing plates (4091), and nuts (4093) are threaded onto the outer walls of the two bolts (4092).

5. The continuous assembly conveyor track for drawer slides of claim 1, wherein: The outer wall of the oil pipeline (408) is fixedly connected to the left end of the connecting pipe (7), and the right end of the connecting pipe (7) is fixedly connected to the motor (8).

6. The continuous assembly conveyor track for drawer slides of claim 1, wherein: A locator (9) is fixedly connected to the top of the protective cover (2), and a stop plate (10) is fixedly connected to the top of the main body (1).

7. The continuous assembly conveyor track for drawer slides of claim 1, wherein: A support frame (11) is fixedly connected to the top of the main body (1), and two sliding columns (13) are fixedly connected to the front side of the support frame (11).

8. The conveyor rail for continuous assembly of drawer slides according to claim 7, characterized in that: Both of the sliding columns (13) are fixedly connected to the outer walls of the pushers (12) and the two sliding columns (13) are fixedly connected to the outer walls of the pushers (14).