A soil and water conservation spraying device for ecological restoration of the Loess Plateau

Abstract

The present invention discloses a soil and water conservation spraying device for ecological restoration of the Loess Plateau, which relates to the technical field of ecological restoration. It includes a fixed seat assembled on a transportation tool. A rotating mechanism is rotatably connected to the fixed seat. A guiding and telescopic mechanism is rotatably connected to the rotating mechanism. A spraying mechanism is slidably connected to the guiding and telescopic mechanism. The guiding and telescopic mechanism is used to provide a track for the spraying mechanism to facilitate the spraying operation of the spraying mechanism. A spraying machine is fixedly connected to the position of the fixed seat close to the rotating mechanism. The spraying machine is connected to the spraying mechanism through a pipeline. By setting the guiding and telescopic mechanism in the present invention, when it extends, the side positions of each telescopic member are the same, and a longer track can be laid, thereby increasing the spraying operation range of the spraying mechanism. At the same time, the space occupied when it retracts is smaller.

Description

Technical Field

[0001] The invention relates to the technical field of ecological restoration, and in particular to a water and soil conservation spraying device for ecological restoration of the Loess Plateau. Background Art

[0002] The Loess Plateau is located in the north-central part of my country and is one of the four major plateaus in China. Years of natural erosion have caused serious soil and water loss and land barrenness. Therefore, it is necessary to repair its ecology to prevent soil and water loss. A Chinese patent with announcement number CN116530272B provides a soil and water conservation spraying equipment for ecological restoration in mining areas. The application sets a first-level guide plate, a second-level guide plate and a third-level guide plate that slide and engage with each other in sequence, and their width gradually decreases, so that a long-distance spraying operation range is obtained. More guide plates are needed, and the width of the first-level guide plate is larger, and the space occupied is also larger. Summary of the invention

[0003] The purpose of the present invention is to provide a soil and water conservation spraying equipment for ecological restoration of the Loess Plateau to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0005] The present invention provides a water and soil conservation spraying device for ecological restoration of the Loess Plateau, comprising a fixed seat mounted on a transport vehicle, the fixed seat being rotatably connected to a rotating mechanism, the rotating mechanism being rotatably connected to a guiding telescopic mechanism, the guiding telescopic mechanism being slidably connected to a spraying mechanism, the guiding telescopic mechanism being used to provide a track for the spraying mechanism so that the spraying mechanism can perform spraying operations, the fixed seat being fixedly connected to a spraying machine at a position close to the rotating mechanism, and the spraying machine being connected to the spraying mechanism through a pipeline;

[0006] The guiding telescopic mechanism comprises a sliding track and cross-arranged telescopic rods, and the sliding track completes track layout and retraction as the telescopic rods cross-extend and retract.

[0007] Furthermore, the rotating mechanism includes a rotating seat rotatably connected to a fixed seat, a support plate rotatably connected to the rotating seat, a sliding groove is provided on the support plate, and a telescopic cylinder for adjusting the angle between the support plate and the rotating seat is hinged between the support plate and the rotating seat.

[0008] Further, the guiding and telescoping mechanism includes a threaded rod rotatably connected in the sliding groove. The thread directions at both ends of the threaded rod are opposite. Threaded sleeves are sleeved on both ends of the threaded rod and connected with sliders in a threaded manner. A telescoping unit is rotatably connected to each slider. The telescoping unit includes at least three telescoping members connected in sequence. Each telescoping member includes two telescopic rods arranged in a cross shape. The central positions of the two telescopic rods are rotatably connected through a connecting shaft. One end of the connecting shaft extending outside the telescopic rod is rotatably connected with a sliding track. Slide grooves are respectively formed on both sides at both ends of the sliding track. Connecting rods are slidably connected in the slide grooves. The other end of each connecting rod is rotatably connected with one of the telescopic rods. A rack is fixedly connected to the side of the sliding track away from the support plate. One end of one set of telescopic rods is rotatably connected with the slider. A first motor is fixedly connected to the support plate at a position corresponding to the threaded rod. The output end of the first motor is fixedly connected with the threaded rod.

[0009] Further, the spraying mechanism includes a sliding seat slidably connected to the sliding track. A second motor is fixedly connected to the sliding seat. The output end of the second motor is fixedly connected with a gear. The gear meshes with the rack. A support rod is rotatably connected to the sliding seat through a driving member. Rotation grooves are arrayed on the support rod. A spraying pipe is ball-jointed in each rotation groove. An annular block is rotatably connected to the support rod at a position corresponding to the rotation groove. A connecting block is fixedly connected to the inner wall of the annular block. The connecting block is fixedly connected with the spraying pipe. A pushing rod is fixedly connected to the annular block. A support seat is fixedly connected to the support rod near the annular block. A first rotating shaft is rotatably connected through the support seat. A pushing clamping rod is fixedly connected to the first rotating shaft near the pushing rod. A knocking rod is fixedly connected to the end of the first rotating shaft away from the support rod. A torsion spring is sleeved and fixedly connected on the first rotating shaft. One end of the torsion spring is fixedly connected with the pushing clamping rod. The other end of the torsion spring is fixedly connected with the support rod. A feeding pipe is fixedly connected to the sliding seat near the support rod. A second rotating shaft is rotatably connected to the feeding pipe at a position corresponding to the spraying pipe. Rotating blades are fixedly connected to the second rotating shaft in an array. A belt pulley is fixedly connected to the end of the second rotating shaft extending outside the feeding pipe. A transmission belt is sleeved on both the belt pulley and the annular block.

[0010] Further, the pushing rod is used to engage with the pushing clamping rod and drive the pushing clamping rod to rotate.

[0011] Further, the knocking rod knocks the spraying pipe under the action of the torsion spring.

[0012] Further, the spraying pipe is connected to the feeding pipe through a pipeline.

[0013] Further, the inner wall of the feeding pipe near the rotating blades is inclined to drive the rotating blades to rotate.

[0014] Furthermore, both ends of the sliding track are arranged in an inclined plane, and when two adjacent sliding tracks rotate to be perpendicular to the support rod, the inclined planes at both ends thereof are in contact with each other.

[0015] Furthermore, when two adjacent sliding tracks rotate to be perpendicular to the support rod, the centers of two adjacent racks are on the same straight line.

[0016] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0017] Through the arranged guiding telescopic mechanism, when the guiding telescopic mechanism extends, the positions of the sides of the telescopic members are the same, and a longer track can be arranged, thereby increasing the spraying operation range of the spraying mechanism. Meanwhile, when the guiding telescopic mechanism retracts, the occupied space is small.

[0018] The arranged spraying mechanism drives the rotation of the spraying pipe through the movement of the material in the material conveying pipe, thereby increasing the spraying operation range. Meanwhile, when the spraying pipe rotates, the knocking rod can knock on the spraying pipe to avoid blockage of the spraying pipe and ensure that long-term normal spraying operation can be carried out.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The attached drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and the descriptions thereof are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention Figure 1 ;

[0022] Figure 2 is a schematic diagram of the overall structure of the present invention Figure 2 ;

[0023] Figure 3 is a schematic diagram of the connection structure between the guiding telescopic mechanism and the support plate of the present invention;

[0024] Figure 4 is a schematic diagram of the connection structure between the second motor and the gear in the spraying mechanism of the present invention;

[0025] Figure 5 is a partial structure schematic diagram of the spraying mechanism of the present invention;

[0026] Figure 6 is Figure 5 an enlarged view of part A in

[0027] Figure 7 It is a schematic diagram of the connection structure between the material conveying pipe and the rotating blade of the present invention;

[0028] In the figure:

[0029] 1. Fixed seat; 2. Rotating mechanism; 3. Guiding telescopic mechanism; 4. Spraying and sowing mechanism; 5. Spraying and sowing machine; 6. Rotating seat; 7. Support plate; 8. Sliding groove; 9. Telescopic cylinder; 10. Threaded rod; 11. Slide block; 12. Telescopic unit; 13. Telescopic member; 14. Telescopic rod; 15. Connecting shaft; 16. Sliding track; 17. Chute; 18. Connecting rod; 19. Rack; 20. First motor; 21. Sliding seat; 22. Second motor; 23. Gear; 24. Support rod; 25. Rotating groove; 26. Spraying and sowing pipe; 27. Annular block; 28. Connecting block; 29. Pushing rod; 30. Support seat; 31. First rotating shaft; 32. Pushing and clamping rod; 33. Knocking rod; 34. Torsion spring; 35. Material conveying pipe; 36. Second rotating shaft; 37. Rotating blade; 38. Belt pulley; 39. Transmission belt. Specific embodiments

[0030] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0031] Please refer to Figures 1 to 7 , the present invention provides a soil and water conservation spraying and sowing device for ecological restoration of the Loess Plateau, including a fixed seat 1 assembled on a transportation tool. A rotating mechanism 2 is rotatably connected to the fixed seat 1. A guiding telescopic mechanism 3 is rotatably connected to the rotating mechanism 2. A spraying and sowing mechanism 4 is slidably connected to the guiding telescopic mechanism 3. The guiding telescopic mechanism 3 is used to provide a track for the spraying and sowing mechanism 4 to facilitate the spraying and sowing operation of the spraying and sowing mechanism 4. A spraying and sowing machine 5 is fixedly connected to the fixed seat 1 near the rotating mechanism 2. The spraying and sowing machine 5 is connected to the spraying and sowing mechanism 4 through a pipeline;

[0032] Among them, the guiding telescopic mechanism 3 includes a sliding track 16 and cross - arranged telescopic rods 14. The sliding track 16 is deployed and retracted along with the cross - expansion and contraction of the telescopic rods 14.

[0033] The provided rotating mechanism 2 drives the guiding telescopic mechanism 3 to rotate, so that the spraying and sowing mechanism 4 forms a suitable angle with the land of the Loess Plateau, facilitating the spraying and sowing operation. The guiding telescopic mechanism 3 is used to lay out the track. At the same time, the space occupied by the guiding telescopic mechanism 3 when it retracts is small, so that when it extends, it can lay out a long-distance track, enabling the spraying and sowing mechanism 4 to carry out a large-scale spraying and sowing operation. The spraying and sowing mechanism 4 moves on the laid track and sprays the soil and grass seeds in the spraying and sowing machine 5 onto the land of the Loess Plateau.

[0034] Please refer to Figure 1 and Figure 2 As shown in FIGS. and, the rotating mechanism 2 includes a rotating seat 6 rotatably connected to the fixed seat 1. A support plate 7 is rotatably connected to the rotating seat 6. A sliding groove 8 is formed in the support plate 7. A telescopic cylinder 9 for adjusting the angle between the support plate 7 and the rotating seat 6 is hinged between the support plate 7 and the rotating seat 6.

[0035] The telescopic cylinder 9 drives the support plate 7 to rotate, adjusting the angle between the support plate 7 and the land of the Loess Plateau to facilitate the spraying and sowing operation.

[0036] Please refer to Figure 1 and Figure 3 As shown in FIGS. and, the guiding telescopic mechanism 3 includes a threaded rod 10 rotatably connected in the sliding groove 8. The thread directions at both ends of the threaded rod 10 are opposite. Threaded connection sleeves 11 are sleeved on both ends of the threaded rod 10. A telescopic unit 12 is rotatably connected to each slider 11. The telescopic unit 12 includes at least three sequentially connected telescopic members 13. The telescopic member 13 includes two cross-set telescopic rods 14. The central positions of the two telescopic rods 14 are rotatably connected by a connecting shaft 15. One end of the connecting shaft 15 extending outside the telescopic rod 14 is rotatably connected to a sliding track 16. Sliding grooves 17 are formed on both sides at both ends of the sliding track 16. Connecting rods 18 are slidably connected in the sliding grooves 17. The other end of the connecting rod 18 is rotatably connected to one of the telescopic rods 14. A rack 19 is fixedly connected to the side of the sliding track 16 away from the support plate 7. One end of one group of the telescopic rods 14 is rotatably connected to the slider 11. A first motor 20 is fixedly connected to the position of the support plate 7 corresponding to the threaded rod 10. The output end of the first motor 20 is fixedly connected to the threaded rod 10.

[0037] In the initial state, the two sliders 11 are in positions away from each other, and the telescopic rod 14 is in a retracted state. When performing the hydroseeding operation, the first motor 20 is started. The first motor 20 drives the threaded rod 10 to rotate. The rotation of the threaded rod 10 drives the two sliders 11 to move towards each other. The movement of the sliders 11 drives one end of the two telescopic rods 14 to move towards each other. The two telescopic rods 14 rotate relative to the connecting shaft 15, so that the telescopic rod 14 extends. When the telescopic rod 14 rotates, it drives the connecting rod 18 to move. The movement of the connecting rod 18 drives the sliding track 16 to rotate relative to the connecting shaft 15. When the telescopic rod 14 extends to the longest, the adjacent two sliding tracks 16 are butted, so that the adjacent racks 19 are butted. When extending, the positions on both sides of the telescopic rod 14 are on a straight line, solving the problem that the width of the sleeved connection track gradually decreases and the length during extension is limited. More telescopic members 13 can be provided, so that the laid track can be longer, and a larger range of hydroseeding operations can be carried out. When retracting, it is the opposite of the above process, and the adjacent telescopic rods 14 on the same side approach each other, occupying a smaller space.

[0038] Please refer to Figures 3 to 7 As shown in the figure, the hydroseeding mechanism 4 includes a sliding seat 21 slidably connected to the sliding track 16. A second motor 22 is fixedly connected to the sliding seat 21. The output end of the second motor 22 is fixedly connected with a gear 23. The gear 23 meshes with the rack 19. A support rod 24 is rotatably connected to the sliding seat 21 through a driving member. Rotation grooves 25 are arrayed on the support rod 24. Each rotation groove 25 is ball-connected with a hydroseeding pipe 26. A ring block 27 is rotatably connected to the position of the support rod 24 corresponding to the rotation groove 25. A connecting block 28 is fixedly connected to the inner wall of the ring block 27. The connecting block 28 is fixedly connected with the hydroseeding pipe 26. A push rod 29 is fixedly connected to the ring block 27. A support seat 30 is fixedly connected to the position of the support rod 24 close to the ring block 27. A first rotating shaft 31 is rotatably connected through the support seat 30. A push rod 32 is fixedly connected to the position of the first rotating shaft 31 close to the push rod 29. A knocking rod 33 is fixedly connected to the end of the first rotating shaft 31 away from the support rod 24. A torsion spring 34 is sleeved and fixedly connected to the first rotating shaft 31. One end of the torsion spring 34 is fixedly connected with the push rod 32. The other end of the torsion spring 34 is fixedly connected with the support rod 24. A feed pipe 35 is fixedly connected to the position of the sliding seat 21 close to the support rod 24. A second rotating shaft 36 is rotatably connected to the position of the feed pipe 35 corresponding to the hydroseeding pipe 26. Rotating blades 37 are fixedly connected to the second rotating shaft 36 in an array. A pulley 38 is fixedly connected to the end of the second rotating shaft 36 extending outside the feed pipe 35. A transmission belt 39 is sleeved on the pulley 38 and the ring block 27 together.

[0039] When the spraying machine 5 sprays materials such as soil and grass seeds into the material conveying pipe 35 through a pipeline, the materials move within the material conveying pipe 35 to drive the rotating blade 37 to rotate around the second rotating shaft 36. The rotation of the second rotating shaft 36 drives the belt pulley 38 to rotate. The rotation of the belt pulley 38 drives the annular block 27 to rotate through the transmission belt 39. The rotation of the annular block 27 drives the connecting block 28 to move. The movement of the connecting block 28 drives the spraying pipe 26 to rotate. The rotation of the spraying pipe 26 enables the materials entering the spraying pipe 26 through the material conveying pipe 35 and the corresponding pipelines to have a larger spraying range, increasing the spraying range, thereby reducing the number of installed spraying pipes 26 and reducing costs. At the same time, when the materials pass through the rotating blade 37, the rotating blade 37 can stir the materials, making the soil, grass seeds, etc. in the materials evenly mixed. At the same time, the rotation of the annular block 27 can drive the push rod 29 to rotate. When the push rod 29 rotates to the position where it engages with the push rod 32, it engages with the push rod 32. The push rod 29 will drive the push rod 32 to rotate. The rotation of the push rod 32 drives the first rotating shaft 31 to rotate. The rotation of the first rotating shaft 31 drives the knocking rod 33 to rotate, and at the same time makes the torsion spring 34 rotate to store energy. When the push rod 29 continues to rotate and disengages from the push rod 32, under the action of the torsion spring 34, the knocking rod 33 rotates in the reverse direction to knock on the spraying pipe 26, preventing the materials in the spraying pipe 26 from being blocked and ensuring that long-term normal spraying operations can be carried out. When carrying out spraying operations, the second motor 22 is started. The second motor 22 drives the gear 23 to rotate. The rotation of the gear 23 meshes with the rack 19, so that the sliding seat 21 moves along the rack 19 on the sliding track 16 to carry out spraying operations. The driving member can be a power element such as a motor or a cylinder to drive the support rod 24 to rotate to avoid collision with the rotating seat 6. Such driving members are very common in the prior art and will not be elaborated here.

[0040] Please refer to Figure 6 , the push rod 29 is used to engage with the push rod 32 and drive the push rod 32 to rotate, so that the push rod 29 can cyclically engage with and disengage from the push rod 32, so that the knocking rod 33 knocks on the spraying pipe 26.

[0041] Please refer to Figure 5 , the knocking rod 33 knocks on the spraying pipe 26 under the action of the torsion spring 34 to prevent the materials in the spraying pipe 26 from being blocked.

[0042] Please refer to Figure 3 , the spraying pipe 26 is connected to the material conveying pipe 35 through a pipeline, so that the materials in the material conveying pipe 35 can enter the spraying pipe 26 through the pipeline, thereby carrying out spraying operations.

[0043] Please refer to Figure 7 , the inner wall of the material conveying pipe 35 close to the rotating blade 37 is inclined to drive the rotating blade 37 to rotate, so that when the materials pass through, they can drive the rotating blade 37 to rotate and stir the materials.

[0044] Please refer to Figure 3 , both ends of the sliding track 16 are arranged in an inclined plane. When two adjacent sliding tracks 16 rotate to be perpendicular to the support rod 24, the inclined planes at both ends thereof are in contact with each other. The arrangement of the inclined planes at both ends of the sliding track 16 can ensure that two adjacent sliding tracks 16 can rotate normally without mutual obstruction, and at the same time limit the continuous rotation of the sliding track 16 when the rotation is in place.

[0045] Please refer to Figure 3 , when two adjacent sliding tracks 16 rotate to be perpendicular to the support rod 24, the centers of two adjacent racks 19 are on the same straight line, ensuring that the gear 23 can always be engaged with the rack 19, so that the sliding seat 21 can move normally.

[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A soil and water conservation spraying device for ecological restoration of the Loess Plateau, comprising a fixed device mounted on a transport vehicle, characterized in that: The fixed seat is rotatably connected with a rotating mechanism, the rotating mechanism is rotatably connected with a guiding telescopic mechanism, the guiding telescopic mechanism is slidably connected with a spraying mechanism, the guiding telescopic mechanism is used to provide a track for the spraying mechanism so that the spraying mechanism can perform spraying operations, the fixed seat is fixedly connected with a spraying machine near the rotating mechanism, and the spraying machine is connected to the spraying mechanism through a pipeline; The guiding telescopic mechanism includes a sliding track and cross-arranged telescopic rods, and the sliding track is arranged and retracted along with the cross-extension of the telescopic rods; The rotating mechanism includes a rotating seat rotatably connected to the fixed seat, a support plate rotatably connected to the rotating seat, a sliding groove is provided on the support plate, and a telescopic cylinder for adjusting the angle between the support plate and the rotating seat is hinged between the support plate and the rotating seat; The guiding telescopic mechanism comprises a threaded rod rotatably connected to a sliding groove, the threads at both ends of the threaded rod have opposite rotation directions, both ends of the threaded rod are sleeved with a threaded connection with a slider, each slider is rotatably connected to a telescopic unit, the telescopic unit comprises at least three telescopic parts connected in sequence, the telescopic part comprises two cross-arranged telescopic rods, the center positions of the two telescopic rods are rotatably connected by a connecting shaft, one end of the connecting shaft extending outside the telescopic rod is rotatably connected to a sliding track, both sides of the two ends of the sliding track are provided with a sliding groove, the sliding grooves are slidably connected with a connecting rod, the other end of the connecting rod is rotatably connected to one of the telescopic rods, a rack is fixedly connected to one side of the sliding track away from the support plate, one end of one group of telescopic rods is rotatably connected to the slider, a first motor is fixedly connected to a position of the support plate corresponding to the threaded rod, and an output end of the first motor is fixedly connected to the threaded rod; when the telescopic rod is extended to the longest, two adjacent sliding tracks are connected to each other, so that adjacent racks are connected to each other; The spraying mechanism includes a sliding seat slidably connected to the sliding track, a second motor is fixedly connected to the sliding seat, a gear is fixedly connected to the output end of the second motor, and the gear is meshed with the rack; the second motor drives the gear to rotate, and the gear rotates and meshes with the rack, so that the sliding seat moves along the rack on the sliding track.

2. According to claim 1, the water and soil conservation spraying equipment for ecological restoration of the Loess Plateau is characterized in that: The spraying mechanism also includes: a support rod is rotatably connected to the sliding seat through a driving member, a rotating groove is arranged in an array on the support rod, and a spraying tube is spherically connected in each rotating groove, an annular block is rotatably connected to the position corresponding to the rotating groove on the support rod, a connecting block is fixedly connected to the inner wall of the annular block, the connecting block is fixedly connected to the spraying tube, and a pushing rod is fixedly connected to the annular block, and the support rod is fixedly connected to the support seat at a position close to the annular block, a first rotating shaft is rotatably connected to the support seat, a pushing clamping rod is fixedly connected to the position of the first rotating shaft close to the pushing rod, a knocking rod is fixedly connected to the first rotating shaft at one end away from the support rod, a torsion spring is sleeved and fixedly connected to the first rotating shaft, one end of the torsion spring is fixedly connected to the pushing clamping rod, and the other end of the torsion spring is fixedly connected to the support rod, a feed pipe is fixedly connected to the position close to the support rod on the sliding seat, and a second rotating shaft is rotatably connected to the position corresponding to the spraying tube, and a rotating blade is fixedly connected to the second rotating shaft in an array, and a pulley is fixedly connected to one end of the second rotating shaft extending outside the feed pipe, and a transmission belt is jointly sleeved on the pulley and the annular block.

3. According to claim 2, the water and soil conservation spraying equipment for ecological restoration of the Loess Plateau is characterized in that: The push rod is used to engage with the push clamp rod and drive the push clamp rod to rotate.

4. According to claim 2, the water and soil conservation spraying equipment for ecological restoration of the Loess Plateau is characterized in that: The knocking rod knocks the spraying tube under the action of the torsion spring.

5. According to claim 2, the water and soil conservation spraying equipment for ecological restoration of the Loess Plateau is characterized in that: The spraying pipe is connected with the feeding pipe through a pipeline.

6. The water and soil conservation spraying equipment for ecological restoration of the Loess Plateau according to claim 2 is characterized in that: The inner wall of the material conveying pipe close to the rotating blade is inclined to drive the rotating blade to rotate.

7. The water and soil conservation spraying equipment for ecological restoration of the Loess Plateau according to claim 2 is characterized in that: Both ends of the sliding track are arranged with inclined surfaces, and when two adjacent sliding tracks are rotated to be perpendicular to the support rod, the inclined surfaces at both ends thereof are in contact with each other.

8. The water and soil conservation spraying equipment for ecological restoration of the Loess Plateau according to claim 2 is characterized in that: When two adjacent sliding rails rotate to be perpendicular to the support rod, the centers of two adjacent racks are in a straight line.

Images