Drying device for paperboard production

Abstract

The drying device for paperboard production comprises a bottom groove, a motor is fixedly connected to the interior of the bottom groove, a rotating frame is fixedly connected to the output end of the motor, a gear ring is arranged on the edge of the bottom groove, a heat insulation disc is fixedly connected to the top of the rotating frame, and a drying oven is fixedly connected to the top of the heat insulation disc. A plurality of connecting shafts are rotationally connected to the outer side of the rotating frame, gears are fixedly connected to the outer sides of the connecting shafts, the gears and the gear rings are in meshed connection, and a containing frame used for containing paperboards is fixedly connected to the tops of the connecting shafts. According to the paperboard drying device, the motor is started to enable the rotating frame to rotate, the heat insulation disc and the drying oven are driven to rotate, a gear ring and a gear are used in cooperation, a connecting shaft can rotate, accordingly, a containing frame is driven to rotate, two-side overturning of paperboards on the containing frame is facilitated, the paperboards are heated more uniformly, and the drying quality and efficiency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of drying for paperboard production, and in particular relates to a drying device for paperboard production. Background Art

[0002] Drying is an important part of cardboard production. In the drying process, the commonly used equipment is the drying cylinder. Hot steam enters the interior of the drying cylinder and transfers heat to the surface of the cylinder. When the cardboard passes through the surface of the drying cylinder, the heat evaporates the moisture in the cardboard, thereby achieving the purpose of drying. The drying temperature is generally adjusted according to factors such as the type and thickness of the cardboard, usually around 80-120 degrees Celsius. In addition, there is a hot air drying method. The hot air is transported to the drying channel through the fan, and the cardboard runs in the channel, and the hot air takes away the moisture in the cardboard. The advantage of this method is that the drying is relatively uniform. In order to improve the drying efficiency, some production lines will also adopt multi-stage drying, setting different temperatures and wind speeds at different stages to allow the cardboard to dry gradually and ensure the quality and performance of the cardboard.

[0003] In the prior art, Chinese patent CN221840025U discloses a drying device for carton and paperboard production, which belongs to the technical field of carton and paperboard production, and includes a drying box, the inner bottom wall of the drying box is fixedly connected with a push-out mechanism, and the upper end of the push-out mechanism is fixedly connected with a six-layer grid for placing paperboard, the rear side of the drying box is connected with a reciprocating translation mechanism, and one end of the reciprocating translation mechanism extends into the drying box and is fixedly connected with a vertically arranged mounting plate, the front side of the mounting plate is fixedly connected with seven heating rods arranged at equal intervals in sequence from top to bottom, and the seven heating rods extend into the six-layer grid.

[0004] However, the drying device for cardboard production provided in the above technical solution still has many disadvantages in actual use. For example, it is inconvenient to turn over multiple cardboards when drying the cardboards, which makes it easy for multiple cardboards to be heated unevenly during drying, thereby affecting the quality of cardboard drying and resulting in poor practicality. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In order to solve the problem that the drying device for cardboard production proposed in the above background technology is not convenient for turning over multiple cardboards when drying cardboards, so that multiple cardboards are easily heated unevenly during drying, thereby affecting the quality of cardboard drying and resulting in poor practicality, the present invention adopts the following technical solution.

[0007] A drying device for cardboard production, comprising a bottom trough, a motor is fixedly connected to the inside of the bottom trough, a rotating frame is fixedly connected to the output end of the motor, a gear ring is arranged at the edge of the bottom trough, a heat insulation plate is fixedly connected to the top of the rotating frame, a drying oven is fixedly connected to the top of the heat insulation plate, a plurality of connecting shafts are rotatably connected to the outside of the rotating frame, gears are fixedly connected to the outside of the connecting shafts, and the gears and the gear rings are meshingly connected, and a placement frame for placing cardboards is fixedly connected to the top of the connecting shafts. Preferably, the vertical center line of the drying oven coincides with the vertical center line of the bottom trough, a plurality of air vents are opened on the outside of the drying oven, and the plurality of air vents are evenly distributed in a ring shape about the vertical center of the drying oven, and a box cover is movably connected to the top of the drying oven.

[0008] Preferably, the vertical center line of the rotating frame coincides with the vertical center line of the bottom groove, a plurality of gears are evenly distributed in a ring shape about the vertical center line of the rotating frame, and the central axis of the gear coincides with the central axis of its corresponding connecting shaft.

[0009] Preferably, an annular groove is formed on the inner wall of the bottom groove, and the ends of the rotating frame of the annular groove are slidably connected, the thickness of the rotating frame matches the width of the annular groove, and the vertical center line of the rotating frame coincides with the central axis of the motor.

[0010] Preferably, an asbestos net is fixedly connected to the back of the placement frame, a straight groove is provided at the inner bottom of the placement frame, and the back of the asbestos net is flush with the back of the placement frame.

[0011] Preferably, a movable table is provided on the front side of the placement frame, and both ends of the front side of the placement frame are fixedly connected with first electric slide rails for sliding the movable table, the middle thread of the movable table is connected with a threaded rod, and the end of the threaded rod close to the asbestos net is rotatably connected with a humidity detection plate, the first electric slide rail is symmetrical about the vertical center line of the placement frame, the end of the threaded rod is a "plum blossom" structure, and one side of the movable table is in contact with one side of the placement frame.

[0012] Preferably, a fixing frame is arranged on the top of the placement frame, a card slot is opened on the bottom of the fixing frame, both ends of the fixing frame are threadedly connected with fixing rods, and the fixing rods pass through one side of the fixing frame and communicate with the card slot.

[0013] Preferably, both sides of the placement frame are provided with slots for the fixed frame to slide, and the placement frame and the slots are connected by a sliding column, and the outer side of the sliding column is threadedly connected with a locking ring, and the sliding column can be fixed in the slot by tightening the locking ring.

[0014] Preferably, a plurality of second electric slide rails are fixedly connected to the outer side of the bottom groove, and the tops of the plurality of second electric slide rails are slidably connected to the same protective cover, the vertical center line of the protective cover coincides with the vertical center line of the bottom groove, and a plurality of air holes penetrating the top of the protective cover are opened on the top of the protective cover, and the plurality of air holes are evenly distributed in a ring shape about the vertical center line of the protective cover.

[0015] Preferably, a plurality of feet are fixedly connected to the bottom of the bottom groove, a plurality of mounting plates are fixedly connected to the outer side of the bottom groove, the plurality of feet and the plurality of mounting plates are evenly distributed in a ring shape about the vertical center line of the bottom groove, and the plurality of mounting plates and the plurality of second electric slide rails are distributed alternately.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can dry the cardboard on the placement frame through the oven, the arrangement of multiple air vents facilitates uniform dispersion of the heat in the oven, opening the box cover enables the user to check the internal components of the oven, starting the motor to rotate the rotating frame, driving the heat insulation plate and the oven to rotate, and with the use of the gear ring and the gear, the connecting shaft can be rotated, thereby driving the placement frame to rotate, making it convenient to flip the cardboard on the placement frame on both sides, so that the cardboard is heated more evenly, thereby improving the quality and efficiency of drying.

[0017] The present invention can clamp the cardboard to be dried by the straight groove at the bottom of the inner side of the placement frame, and the device is provided with multiple placement frames, which can place multiple cardboards at the same time, so as to facilitate the simultaneous drying of multiple cardboards and improve the drying efficiency of the device. The top of the cardboard can be clamped by the card slot at the bottom of the fixed frame, and the top of the cardboard can be clamped and fixed by rotating the fixing rod, so as to improve the stability of the cardboard placed by the device. The asbestos net on one side of the placement frame is convenient for the cardboard to lean on, which is conducive to the stable placement of the cardboard. At the same time, the asbestos net is conducive to uniform heating of the cardboard during drying. The fixed frame can be moved up and down by the coordinated use of the sliding column and the notch, which is convenient for adjusting the height of the fixed frame and facilitating the placement and fixing of cardboards of different lengths by the placement frame. Tightening the locking ring can limit the sliding of the sliding column in the notch.

[0018] The present invention can move the movable table up and down by using the first electric slide rail and the slider, and rotate the threaded rod to make the humidity detection plate fit the cardboard. The humidity detection plate can detect the drying degree of the cardboard to further ensure the quality of drying. During drying, the second electric slide rail can be used to lower the protective cover to cover the placement frame and other devices, reduce heat loss, and further improve the drying efficiency. Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the bottom three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the bottom tank of the present invention; Figure 5 It is a schematic diagram of the top view of the bottom tank structure of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the placement frame of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the bottom tank and the oven of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the oven and the heat insulation tray of the present invention.

[0019] The corresponding relationship between the illustrations and component names in the figure is as follows: 1. Bottom groove; 2. Motor; 3. Rotating frame; 4. Gear ring; 5. Heat insulation plate; 6. Oven; 7. Connecting shaft; 8. Gear; 9. Placement frame; 10. Air outlet; 11. Box cover; 12. Ring groove; 13. Asbestos net; 14. Movable table; 15. First electric slide rail; 16. Threaded rod; 17. Humidity detection plate; 18. Fixed frame; 19. Fixed rod; 20. Sliding column; 21. Locking ring; 22. Second electric slide rail; 23. Protective cover; 24. Air vent; 25. Foot pad; 26. Mounting plate; 27. Notch. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0023] See also Figure 1-8An embodiment of the present invention is as follows: a drying device for cardboard production, comprising a bottom trough 1, a plurality of feet 25 are fixedly connected to the bottom of the bottom trough 1, a plurality of mounting plates 26 are fixedly connected to the outer side of the bottom trough 1, the plurality of feet 25 and the plurality of mounting plates 26 are evenly distributed in a ring shape about the vertical center line of the bottom trough 1, the plurality of mounting plates 26 and the plurality of second electric slide rails 22 are distributed alternately, the device can be placed on an external horizontal plane and supported by the feet 25 to prevent wear between the bottom trough 1 and the external horizontal plane, and the bottom trough 1 can be fixed to the external horizontal plane by using external bolts and the mounting plates 26 to complete the installation of the device.

[0024] In this embodiment, a plurality of second electric slide rails 22 are fixedly connected to the outer side of the bottom groove 1, and a same protective cover 23 is slidably connected to the top of the plurality of second electric slide rails 22. The vertical center line of the protective cover 23 coincides with the vertical center line of the bottom groove 1. A plurality of air holes 24 penetrating the top of the protective cover 23 are provided on the top of the protective cover 23. The plurality of air holes 24 are evenly distributed in a ring shape about the vertical center line of the protective cover 23. By using the second electric slide rail 22 and the slider in coordination, the protective cover 23 can be lifted, so that the device can be opened easily. In this embodiment, a motor 2 is fixedly connected to the inside of the bottom groove 1, a rotating frame 3 is fixedly connected to the output end of the motor 2, a gear ring 4 is provided at the edge of the bottom groove 1, a heat insulation plate 5 is fixedly connected to the top of the rotating frame 3, an oven 6 is fixedly connected to the top of the heat insulation plate 5, a plurality of connecting shafts 7 are rotatably connected to the outer side of the rotating frame 3, a gear 8 is fixedly connected to the outer side of the connecting shaft 7, and the gear 8 and the gear ring 4 are meshingly connected.

[0025] In this embodiment, the vertical center line of the rotating frame 3 coincides with the vertical center line of the bottom groove 1, and a plurality of gears 8 are evenly distributed in a ring shape about the vertical center line of the rotating frame 3. The central axis of the gear 8 coincides with the central axis of its corresponding connecting shaft 7, and a placement frame 9 for placing cardboards is fixedly connected to the top of the connecting shaft 7. In this embodiment, a fixing frame 18 is provided at the top of the placement frame 9, and a card slot is provided at the bottom of the fixing frame 18. Both ends of the fixing frame 18 are threadedly connected with fixing rods 19, and the fixing rod 19 passes through one side of the fixing frame 18 and communicates with the card slot. The cardboard to be dried can be clamped through the straight groove at the bottom inner side of the placement frame 9. In addition, the device is provided with multiple placement frames 9, which can place multiple cardboards at the same time, so as to facilitate drying of multiple cardboards at the same time and improve the drying efficiency of the device. The top of the cardboard can be clamped by using the card slot at the bottom of the fixing frame 18, and the top of the cardboard can be clamped and fixed by rotating the fixing rod 19, thereby improving the stability of the cardboard placed by the device.

[0026] In this embodiment, slots 27 for sliding the fixed frame 18 are provided on both sides of the placement frame 9, and the placement frame 9 is connected to the slots 27 via a slide post 20. The outer side of the slide post 20 is threadedly connected to a locking ring 21. By tightening the locking ring 21, the slide post 20 can be fixed in the slot 27. By cooperating with the slide post 20 and the slot 27, the fixed frame 18 can be moved up and down, which is convenient for adjusting the height of the fixed frame 18 and facilitating the placement frame 9 to place and fix cardboards of different lengths. Tightening the locking ring 21 can limit the sliding of the slide post 20 in the slot 27.

[0027] In this embodiment, starting the motor 2 causes the rotating frame 3 to rotate, driving the insulation plate 5 and the oven 6 to rotate. With the use of the ring gear 4 and the gear 8, the connecting shaft 7 can be rotated, thereby driving the placement frame 9 to rotate, making it convenient to flip the cardboard on the placement frame 9 on both sides, so that the cardboard is heated more evenly, improving the quality and efficiency of drying. The protective cover 23 can be lowered by the second electric slide rail 22, thereby covering the placement frame 9 and other devices, reducing heat loss, and further improving the drying efficiency. The setting of the air vent 24 facilitates the discharge of water vapor and prevents the cardboard from being damp again.

[0028] In this embodiment, the vertical center line of the oven 6 coincides with the vertical center line of the bottom groove 1, and a plurality of air vents 10 are provided on the outer side of the oven 6. The plurality of air vents 10 are evenly distributed in a ring shape about the vertical center of the oven 6. A box cover 11 is movably connected to the top of the oven 6. The cardboard on the placement frame 9 can be dried through the oven 6. The provision of the plurality of air vents 10 facilitates evenly dispersing the heat in the oven 6. Opening the box cover 11 allows the user to check the internal components of the oven 6.

[0029] In this embodiment, an annular groove 12 is provided on the inner wall of the bottom groove 1, and the ends of the rotating frame 3 of the annular groove 12 are slidably connected, the thickness of the rotating frame 3 is consistent with the width of the annular groove 12, and the vertical center line of the rotating frame 3 coincides with the central axis of the motor 2. The setting of the annular groove 12 can limit the rotation of the rotating frame 3 and ensure the stability of the rotation of the rotating frame 3.

[0030] In this embodiment, an asbestos net 13 is fixedly connected to the back of the placement frame 9, a straight groove is provided at the inner bottom of the placement frame 9, the back of the asbestos net 13 is flush with the back of the placement frame 9, and the asbestos net 13 on one side of the placement frame 9 is convenient for the cardboard to lean on, which is conducive to the stable placement of the cardboard. At the same time, the asbestos net 13 is conducive to uniform heating of the cardboard during drying.

[0031] In this embodiment, a movable table 14 is provided on the front side of the placement frame 9, and both ends of the front side of the placement frame 9 are fixedly connected with first electric slide rails 15 for sliding the movable table 14, and the middle thread of the movable table 14 is connected with a threaded rod 16, and the end of the threaded rod 16 close to the asbestos net 13 is rotatably connected with a humidity detection plate 17. The first electric slide rail 15 is symmetrical about the vertical center line of the placement frame 9, and the end of the threaded rod 16 is a "plum blossom" structure. One side of the movable table 14 is in contact with one side of the placement frame 9. Through the coordinated use of the first electric slide rail 15 and the slider, the movable table 14 can be moved up and down, and the threaded rod 16 is rotated to make the humidity detection plate 17 fit with the cardboard. The drying degree of the cardboard can be detected by the humidity detection plate 17 to further ensure the quality of drying.

[0032] Working principle: When using this device, first, the device can be placed on the external horizontal plane through the feet 25 to prevent wear between the bottom tank 1 and the external horizontal plane. The bottom tank 1 can be fixed to the external horizontal plane by using the external bolts and the mounting plate 26 to complete the installation of this device. The protective cover 23 can be raised by using the second electric slide rail 22 and the slider to facilitate opening of the device.

[0033] The cardboard to be dried can be clamped by the straight groove at the bottom inner side of the placement frame 9, and the device is provided with multiple placement frames 9, which can place multiple cardboards at the same time, so as to facilitate drying multiple cardboards at the same time and improve the drying efficiency of the device. The top of the cardboard can be clamped by the card slot at the bottom of the fixed frame 18, and the top of the cardboard can be clamped and fixed by rotating the fixing rod 19, so as to improve the stability of the cardboard placed by the device. The asbestos net 13 on one side of the placement frame 9 is convenient for the cardboard to lean on, which is conducive to the stable placement of the cardboard. At the same time, the asbestos net 13 is conducive to uniform heating of the cardboard during drying. Through the coordinated use of the sliding column 20 and the notch 27, the fixed frame 18 can be moved up and down, which is convenient for adjusting the height of the fixed frame 18, and it is convenient for the placement frame 9 to place and fix cardboards of different lengths. Tightening the locking ring 21 can limit the sliding of the sliding column 20 in the notch 27.

[0034] The cardboard on the placement frame 9 can be dried by the oven 6. The arrangement of multiple air vents 10 facilitates the uniform dispersion of heat in the oven 6. Opening the box cover 11 facilitates the user to check the internal components of the oven 6. Starting the motor 2 rotates the rotating frame 3, driving the heat insulation plate 5 and the oven 6 to rotate. With the use of the gear ring 4 and the gear 8, the connecting shaft 7 can rotate, thereby driving the placement frame 9 to rotate, making it convenient to flip the cardboard on the placement frame 9 on both sides, so that the cardboard is heated more evenly, improving the quality and efficiency of drying. The arrangement of the annular groove 12 can limit the rotation of the rotating frame 3 and ensure the rotation of the rotating frame 3. Stability. Through the coordinated use of the first electric slide rail 15 and the slider, the movable table 14 can be moved up and down, and the threaded rod 16 is rotated to make the humidity detection plate 17 fit the cardboard. The drying degree of the cardboard can be detected by the humidity detection plate 17 to further ensure the quality of drying. During drying, the protective cover 23 can be lowered by the second electric slide rail 22 to cover the placement frame 9 and other devices, reduce heat loss, and further improve the drying efficiency. The setting of the air vent 24 facilitates the discharge of water vapor to prevent the cardboard from being damp again. The heat insulation plate 5 is made of heat insulation material, which can provide heat insulation protection for the motor 2 and the rotating frame 3.

[0035] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A drying device for paperboard production, comprising a bottom tank (1), characterized in that: The bottom trough (1) is fixedly connected to a motor (2), the output end of the motor (2) is fixedly connected to a rotating frame (3), the edge of the bottom trough (1) is provided with a gear ring (4), the top of the rotating frame (3) is fixedly connected to a heat insulation plate (5), the top of the heat insulation plate (5) is fixedly connected to an oven (6), the outer side of the rotating frame (3) is rotatably connected to a plurality of connecting shafts (7), the outer sides of the connecting shafts (7) are fixedly connected to gears (8), and the gears (8) are meshingly connected to the gear ring (4), and the top of the connecting shaft (7) is fixedly connected to a placement frame (9) for placing cardboard.

2. The drying device for paperboard production according to claim 1, characterized in that: The vertical center line of the oven (6) coincides with the vertical center line of the bottom groove (1); a plurality of air vents (10) are provided on the outside of the oven (6); the plurality of air vents (10) are evenly distributed in a ring shape about the vertical center of the oven (6); and a box cover (11) is movably connected to the top of the oven (6).

3. The drying device for paperboard production according to claim 2, characterized in that: The vertical center line of the rotating frame (3) coincides with the vertical center line of the bottom groove (1), the plurality of gears (8) are evenly distributed in a ring shape about the vertical center line of the rotating frame (3), and the center axis of the gear (8) coincides with the center axis of its corresponding connecting shaft (7).

4. The drying device for paperboard production according to claim 3, characterized in that: The inner wall of the bottom groove (1) is provided with an annular groove (12), and the ends of the rotating frame (3) and the annular groove (12) are slidably connected, the thickness of the rotating frame (3) matches the width of the annular groove (12), and the vertical center line of the rotating frame (3) coincides with the center axis of the motor (2).

5. The drying device for paperboard production according to claim 4, characterized in that: The back of the placement frame (9) is fixedly connected to an asbestos net (13), the inner bottom of the placement frame (9) is provided with a straight groove, and the back of the asbestos net (13) is flush with the back of the placement frame (9).

6. The drying device for paperboard production according to claim 5, characterized in that: A movable platform (14) is arranged on the front side of the placement frame (9), and first electric slide rails (15) for sliding the movable platform (14) are fixedly connected to both ends of the front side of the placement frame (9), a threaded rod (16) is connected to the middle thread of the movable platform (14), and a humidity detection plate (17) is rotatably connected to one end of the threaded rod (16) close to the asbestos net (13), the first electric slide rail (15) is symmetrical about the vertical center line of the placement frame (9), and the end of the threaded rod (16) is a "plum blossom" structure, and one side of the movable platform (14) is in contact with one side of the placement frame (9).

7. The drying device for paperboard production according to claim 6, characterized in that: A fixing frame (18) is arranged on the top of the placement frame (9), a slot is provided on the bottom of the fixing frame (18), both ends of the fixing frame (18) are threadedly connected with fixing rods (19), and the fixing rods (19) pass through one side of the fixing frame (18) and communicate with the slot.

8. The drying device for paperboard production according to claim 7, characterized in that: Both sides of the placement frame (9) are provided with slots (27) for the fixed frame (18) to slide, and the placement frame (9) and the slots (27) are connected via a slide column (20). The outer side of the slide column (20) is threadedly connected to a locking ring (21). By tightening the locking ring (21), the slide column (20) can be fixed in the slot (27).

9. The drying device for paperboard production according to any one of claims 1 to 8, characterized in that: A plurality of second electric slide rails (22) are fixedly connected to the outer side of the bottom groove (1); a same protective cover (23) is slidably connected to the top of the plurality of second electric slide rails (22); a vertical center line of the protective cover (23) coincides with a vertical center line of the bottom groove (1); a plurality of air holes (24) penetrating the top of the protective cover (23) are provided on the top of the protective cover (23); the plurality of air holes (24) are evenly distributed in a ring shape about the vertical center line of the protective cover (23).

10. The drying device for paperboard production according to claim 9, characterized in that: The bottom of the bottom groove (1) is fixedly connected to a plurality of feet (25), and the outer side of the bottom groove (1) is fixedly connected to a plurality of mounting plates (26). The plurality of feet (25) and the plurality of mounting plates (26) are evenly distributed in a ring shape about the vertical center line of the bottom groove (1), and the plurality of mounting plates (26) and the plurality of second electric slide rails (22) are distributed alternately.

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