A floor-lifting device

Abstract

The application discloses a kind of bottom plate lifting devices, it is related to computerized flat knitting machine, to solve the problem of existing technology in improving bottom plate lifting stability needs to be high wallboard, its technical scheme main points are: a kind of bottom plate lifting device, including two wallboards, setting in two wallboards between bottom plate, for driving bottom plate lifting transmission mechanism, the opposite surface of two wallboards is vertically installed with initial optical axis and additional optical axis, initial optical axis and additional optical axis are respectively slidably sleeved with initial sliding sleeve and additional sliding sleeve, the end of the bottom plate is provided with lower extension arm, and the lower extension arm is fixed with initial sliding sleeve and additional sliding sleeve.The application discloses a kind of bottom plate lifting device, by additionally adding additional optical axis and additional sliding sleeve, effectively improve the lifting stability of bottom plate under the premise of not needing to be high wallboard, and meet the conditions of old equipment upgrading.

Description

Technical Field

[0001] This invention relates to computerized flat knitting machines, and more specifically, to a bottom plate lifting device. Background Technology

[0002] The base plate is a crucial component of a flat knitting machine. Its primary function is to provide downward traction to the fabric before it enters the rollers, ensuring a smooth subsequent section of the fabric, improving knitting quality, and reducing waste yarn length. The base plate is equipped with compound needles and a control plate. During the fabric pulling process, the pulling of the fabric is mainly controlled by the opening and closing of the compound needles. The opening and closing of the compound needles is achieved by the left-right swinging of their internal latches. The control plate is linked to the latches of the compound needles, controlling their left-right swinging motion, which in turn controls the opening and closing of the compound needles, thus controlling the pulling of the fabric by the base plate.

[0003] The technical features of the Chinese patent announcement CN202380213U regarding a knitting flat knitting machine's base plate transmission mechanism are as follows: It includes a base plate, a first motor, and a second motor, as well as two sliding rods. The base plate is slidably mounted between the two sliding rods via sleeves on both sides. A control plate and compound needles are mounted on the base plate. The control plate controls the opening and closing of the compound needles by moving left and right. It also includes a transmission shaft. The first motor drives the transmission shaft to rotate. After being driven by the first motor, the transmission shaft, through belts mounted on gears on both sides, controls the lifting and lowering of the base plate. The second motor is fixed to the base plate and moves with it. The output shaft of the second motor, through a cam mechanism, drives the control plate of the base plate to move left and right.

[0004] The above-mentioned technical solution provides vertical lifting and lowering mobility for the base plate through the cooperation of a single sliding rod and a sliding sleeve on both sides. In practical application, it has been found that in order to improve the lifting stability and load-bearing capacity of the sliding sleeve, the length of the sliding sleeve needs to be increased. However, after increasing the length of the sliding sleeve, in order to meet the stroke requirements of the base plate, the length of the sliding rod needs to be increased. The common solution in the existing technology is to increase the height of the wall plate, which has the problem of significant modification to the model. Therefore, a new solution is needed to solve this problem. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a bottom plate lifting device, which effectively improves the lifting stability of the bottom plate without raising the wall plate, and meets the conditions for upgrading old equipment by adding an optical shaft and a sliding sleeve.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a lifting device for a bottom plate, comprising two wall panels, a bottom plate disposed between the two wall panels, a transmission mechanism for driving the lifting of the bottom plate, wherein an initial optical axis and an additional optical axis are vertically installed on the opposite surfaces of the two wall panels, and the initial optical axis and the additional optical axis are respectively slidably sleeved with an initial sliding sleeve and an additional sliding sleeve, and a lower extension arm is provided at the end of the bottom plate, wherein the lower extension arm is fixed to the initial sliding sleeve and the additional sliding sleeve.

[0007] By adopting the above technical solution, this application further supports the lifting and lowering of the base plate by adding an optical shaft and a sliding sleeve. Combined with the original initial optical shaft and initial sliding sleeve, parallel dual-axis lifting and lowering of both ends of the base plate is achieved. This effectively improves the stability of the base plate lifting and lowering without changing the length of the initial optical shaft and initial sliding sleeve, thus avoiding the problem of needing to raise the wall panel and significantly modify the original model. Furthermore, the added optical shaft and sliding sleeve can be installed independently, allowing for the modification and upgrading of factory-produced equipment or assembled warehouse equipment. In summary, this application, by adding an optical shaft and a sliding sleeve, effectively improves the lifting and lowering stability of the base plate without raising the wall panel, and meets the conditions for modifying and upgrading old equipment.

[0008] The present invention is further configured such that: the transmission mechanism includes an output motor mounted on any wall panel, a long shaft rotatably connected between two wall panels, an active synchronous pulley disposed on the long shaft, a driven synchronous pulley rotatably mounted on the wall panel, and a synchronous belt wound around the active synchronous pulley and the driven synchronous pulley; a sprocket assembly is provided between the output motor and the long shaft for transmission; and the synchronous belt is fixed at any position to the initial sliding sleeve.

[0009] The invention is further configured such that: the long shaft includes a long shaft section and a short shaft section; one end of the long shaft section is provided with a keyway for mounting the driven sprocket and the driving synchronizing pulley of the sprocket assembly; one end of the short shaft section is provided with a keyway for mounting another driving synchronizing pulley; the opposite ends of the long shaft section and the short shaft section are respectively provided with semicircular portions; the planes of the two semicircular portions fit together; the opposite ends of the long shaft section and the short shaft section are provided with a sleeve; the sleeve is provided with a sleeve bolt for controlling slack.

[0010] The present invention is further configured such that: each of the active synchronous pulleys is connected to two driven synchronous pulleys; the wall panel pad is equipped with an inner assembly plate; the inner assembly plate is provided with tension adjustment grooves corresponding to the two driven synchronous pulleys; the tension adjustment grooves are slidably connected to wheel axle pins; the wheel axle pins are provided with bearings and connected to the driven synchronous pulleys; the wheel axle pins are provided with an end; the end face of the end is provided with a threaded section; the threaded section is threadedly fitted with a locking nut; the locking nut and the end clamp the inner assembly plate.

[0011] The present invention is further configured such that: the active synchronizing wheel and the driven synchronizing wheel are arranged at both ends of the initial optical axis, and the added optical axis and the added sliding sleeve are designed to extend downward.

[0012] The present invention is further configured such that: a connecting plate is bolted between the initial sliding sleeve and the additional sliding sleeve, and a vertical plate is provided on the connecting plate in the area of ​​the initial sliding sleeve, and the vertical plate is bolted to the lower extension arm.

[0013] The present invention is further configured such that a fabric drop plate is oscillatingly installed between the two wall panels, and a linkage structure is provided between the fabric drop plate and the connecting plate.

[0014] The present invention is further configured such that: the two sides of the fabric drop plate are respectively provided with flanged sheet metal, the wall panel is oscillatingly connected with a lever, and the lever is respectively provided with two connecting arms at the rotation center, and the ends of the two connecting arms are respectively fixed to the flanged sheet metal.

[0015] The present invention is further configured such that: the connecting arm is provided with a buffer end, the wall panel is provided with a force-bearing plate for impact of the buffer end, and the force-bearing plate is provided with a rubber block.

[0016] The invention is further configured such that: the linkage structure includes a pry arm disposed on the lever and a linkage arm disposed on the connecting plate; the bottom end of the linkage arm is rotatably connected to a push roller and an lift roller, the push roller and the lift roller clamping the pry arm from above and below; the connecting plate is provided with a vertical adjustment groove, the linkage arm is provided with a through hole corresponding to the vertical adjustment groove, a vertical adjustment bolt is provided through the vertical adjustment groove and the through hole, and the vertical adjustment bolt is fitted with a vertical adjustment nut.

[0017] In summary, the present invention has the following beneficial effects: by adding an optical shaft and a sliding sleeve, the lifting stability of the base plate is effectively improved without raising the wall panel, and the conditions for upgrading old equipment are met; the technical effect of simultaneously driving both ends of the base plate with a single power source is achieved, effectively improving the displacement consistency of both ends of the base plate; by assembling a long shaft section and a short shaft section to form a long shaft, it can adapt to small differences in the spacing of the wall panels 1; by adjusting the spacing of the two driven synchronous pulleys, the tension of the synchronous belt is adjusted, ensuring the tension consistency of the two synchronous belts. It features simple modification and upgrading work with fewer parts replacements; the linkage structure synchronously controls the fabric dropping plate and the bottom plate, effectively improving the working coordination between the bottom plate and the fabric dropping plate; it realizes a single-side two-point connection between the lever and the fabric dropping plate, effectively ensuring the stability and load-bearing capacity of the fabric dropping plate; the cooperation between the rubber block and the buffer end realizes the buffering of the fabric dropping plate when it closes, effectively eliminating the hidden dangers caused by its inertia; the position of the fabric dropping plate is adjusted by the downward roller and the upward roller, ensuring that the fabric dropping plate is in a closed state when the bottom plate descends to the predetermined position. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this application;

[0019] Figure 2 This is a schematic diagram of the mechanism after the hidden part of the structure in this application;

[0020] Figure 3 This is a schematic diagram of the long axis of this application;

[0021] Figure 4 This is a schematic diagram of the transmission mechanism on one side of this application;

[0022] Figure 5 This is a diagram showing the fit between the internal assembly plate and the driven synchronous pulley in this application;

[0023] Figure 6 This is a schematic diagram of the linkage structure between the base plate and the fabric drop plate in this application;

[0024] Figure 7 This is a schematic diagram of the linkage structure of this application;

[0025] Figure 8 This is a structural diagram of the linkage structure from another perspective in this application.

[0026] Figure Descriptions: 1. Wall panel; 2. Base plate; 3. Initial optical axis; 4. Added optical axis; 5. Initial sliding sleeve; 6. Added sliding sleeve; 7. Lower extension arm; 8. Output motor; 9. Long shaft; 10. Driving synchronous pulley; 11. Driven synchronous pulley; 12. Synchronous belt; 13. Sprocket assembly; 14. Long shaft section; 15. Short shaft section; 16. Keyway; 17. Jacket; 171. Semicircular part; 18. Jacket bolt; 19. Inner assembly plate; 20. Tension adjustment groove; 21. 21. Wheel axle pin; 22. Bearing; 23. End; 24. Threaded section; 25. Locking nut; 26. Connecting plate; 27. Vertical plate; 28. Fabric drop plate; 29. ​​Flanged sheet metal; 30. Lever; 31. Connecting arm; 32. Buffer end; 33. Force plate; 34. Rubber block; 35. Pry arm; 36. Linkage arm; 37. Downward roller; 38. Upward roller; 39. Vertical adjustment groove; 40. Through hole; 41. Vertical adjustment bolt; 42. Vertical adjustment nut. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] A bottom plate lifting device, such as Figure 1 , Figure 2As shown, it includes two wall panels 1, a base plate 2 disposed between the two wall panels 1, and a transmission mechanism for driving the base plate 2 to rise and fall. An initial optical axis 3 and an additional optical axis 4 are vertically installed on the opposite surfaces of the two wall panels 1. The initial optical axis 3 and the additional optical axis 4 are respectively slidably sleeved with an initial sliding sleeve 5 and an additional sliding sleeve 6. A lower extension arm 7 is bolted to the end of the base plate 2. The lower extension arm 7 is fixed to the initial sliding sleeve 5 and the additional sliding sleeve 6.

[0029] This application further supports the lifting and lowering of the base plate 2 by adding an optical shaft 4 and a sliding sleeve 6. Combined with the original initial optical shaft 3 and initial sliding sleeve 5, it achieves parallel dual-axis lifting and lowering at both ends of the base plate 2. This effectively improves the stability of the lifting and lowering of the base plate 2 without changing the length of the initial optical shaft 3 and initial sliding sleeve 5, thus avoiding the need to raise the wall panel 1 and significantly modify the original model. Furthermore, the added optical shaft 4 and sliding sleeve 6 can be installed independently, allowing for the modification and upgrading of factory-made equipment or assembled warehouse equipment. In summary, this application, by adding an optical shaft 4 and a sliding sleeve 6, effectively improves the lifting and lowering stability of the base plate 2 without raising the wall panel 1, and meets the conditions for modifying and upgrading old equipment.

[0030] The specific structure of the transmission mechanism is as follows, such as Figure 1 , Figure 2 As shown, the transmission mechanism includes an output motor 8 mounted on any wall panel 1, a long shaft 9 rotatably connected between two wall panels 1, active synchronous pulleys 10 set at both ends of the long shaft 9, driven synchronous pulleys 11 rotatably mounted on the wall panel 1, and a synchronous belt 12 wound around the active synchronous pulleys 10 and the driven synchronous pulleys 11. A sprocket assembly 13 is provided between the output motor 8 and the long shaft 9 for transmission. The synchronous belt 12 is fixed at any position to the initial sliding sleeve 5. When the transmission mechanism is working normally, the output motor 8 outputs torque, which drives the long shaft 9 and the two active synchronous pulleys 10 to rotate after being transmitted by the sprocket assembly 13. During the rotation of the active synchronous pulleys 10, the synchronous belt 12 drives the base plate 2 to rise or fall after passing through the initial sliding sleeve 5. This achieves the technical effect of a single power source driving both ends of the base plate 2 simultaneously, effectively improving the displacement consistency of both ends of the base plate 2.

[0031] The spacing of the wall panels 1 varies between different machine models, which necessitates the factory to customize the long shaft 9 for each model. This results in a low compatibility of the long shaft 9 parts. To solve this problem, such as... Figure 1 , Figure 3As shown, the long shaft 9 includes a long shaft section 14 and a short shaft section 15. One end of the long shaft section 14 is machined with a keyway 16 for mounting the driven sprocket and the driving synchronizing wheel 10 of the sprocket assembly 13. One end of the short shaft section 15 is machined with a keyway 16 for mounting another driving synchronizing wheel 10. In this embodiment, the long shaft 9 is formed by assembling the long shaft section 14 and the short shaft section 15 to accommodate small differences in the spacing between the wall panels 1. In other embodiments, shaft sections can be further added to form a three-section structure to assemble the long shaft 9, thereby achieving the technical effect of accommodating larger differences in the spacing between the wall panels 1.

[0032] This application assembles the long shaft segment 14 and the short shaft segment 15 in the following manner, such as... Figure 3 As shown, semicircular portions 171 are provided at the opposite ends of the long axis segment 14 and the short axis segment 15, and the planes of the two semicircular portions 171 fit together. A clamp 17 is provided at the opposite ends of the long axis segment 14 and the short axis segment 15, and a clamp bolt 18 is provided on the clamp 17 to control slack. The long axis segment 14 and the short axis segment 15 first eliminate the relative rotational movement around the central axis by fitting the semicircular portions 171 together, and then the two semicircular portions 171 are clamped by the clamp 17 and the clamp bolt 18 to complete the fixation of the long axis segment 14 and the short axis segment 15.

[0033] In practical application, it was found that when there is a significant difference in tension between the two synchronous belts 12, there will be errors in the lifting and lowering of both ends of the base plate 2. Therefore, as follows... Figure 2 , Figure 4 , Figure 5 As shown, each active synchronous pulley 10 is connected to two driven synchronous pulleys 11. The wall panel 1 has an inner mounting plate 19 installed on the pad. The inner mounting plate 19 has tension adjustment grooves 20 for each of the two driven synchronous pulleys 11. The tension adjustment grooves 20 are slidably connected to axle pins 21. The axle pins 21 are equipped with bearings 22 and connected to the driven synchronous pulleys 11. The axle pins 21 are machined with end heads 23. The end face of the end head 23 is machined with a threaded section 24. The threaded section 24 is threaded with a locking nut 25. The locking nut 25 and the end head 23 clamp the inner mounting plate 19. When it is necessary to adjust the tension of the synchronous belt 12, the locking nut 25 is loosened so that the axle pins 21 can slide along the tension adjustment grooves 20, thereby adjusting the distance between the two driven synchronous pulleys 11, and thus realizing the tension adjustment of the synchronous belt 12, ensuring the tension consistency of the two synchronous belts 12.

[0034] To further improve the lifting stability of the base plate 2, such as Figure 4 , Figure 7As shown, the active synchronizing wheel 10 and the driven synchronizing wheel 11 are arranged at both ends of the initial optical axis 3. The added optical axis 4 and the added sliding sleeve 6 are designed to extend downwards, thereby increasing the lifting stability of the base plate 2 by increasing the length of the added sliding sleeve 6, and limiting the position of the active synchronizing wheel 10 and the driven synchronizing wheel 11, thereby ensuring the extension space of the added optical axis 4.

[0035] It should be noted that in this embodiment, the length of the added sliding sleeve 6 is twice that of the initial sliding sleeve 5, and the upper surface of the added sliding sleeve 6 is flush with the upper surface of the initial sliding sleeve 5. The downward extension of the added optical axis 4 is the length difference between the added sliding sleeve 6 and the initial sliding sleeve 5. Thus, while further improving the lifting stability, the original lifting range of the base plate 2 will not be affected.

[0036] This application achieves simultaneous support for the base plate 2 by the initial sliding sleeve 5 and the added sliding sleeve 6 in the following manner: Figure 6 As shown, a connecting plate 26 is bolted between the initial sliding sleeve 5 and the additional sliding sleeve 6, thereby achieving a fixed connection between the initial sliding sleeve 5 and the additional sliding sleeve 6.

[0037] To adapt to the transformation and upgrading of old equipment, such as Figure 6 As shown, the connecting plate 26 is bolted to the vertical plate 27 in the initial sliding sleeve 5 area, and the vertical plate 27 is bolted to the lower extension arm 7. When it is necessary to modify the old equipment, the original vertical plate 27 is removed, the connecting plate 26 is installed, and then the new vertical plate 27 is installed. Finally, the vertical plate 27 is fixed to the lower extension arm 7. This has the technical effect of simplifying the modification and upgrading work and requiring fewer parts to be replaced.

[0038] After installing the optical axis 4 and the sliding sleeve 6, as follows Figure 6 As shown, the mounting surface used to connect the base plate 2 only uses one-third of the area of ​​the connecting plate 26. In order to improve the functionality of adding the optical axis 4 and the sliding sleeve 6, a drop plate 28 is oscillating between the two wall panels 1. A linkage structure is set between the drop plate 28 and the connecting plate 26, so that the drop plate 28 and the base plate 2 are synchronously controlled through the linkage structure, which effectively improves the working coordination between the base plate 2 and the drop plate 28.

[0039] The fabric panel 28 is oscillatingly connected between the two wall panels 1 in the following manner: Figure 6 As shown, the fabric drop plate 28 has flanged sheet metal 29 bent on both sides, and the wall panel 1 is swayed and connected by a lever 30. The lever 30 has two connecting arms 31 processed at the rotation center, and the ends of the two connecting arms 31 are fixed to the flanged sheet metal 29 respectively; thereby realizing the connection between the lever 30 and the fabric drop plate 28 at two points on one side, effectively ensuring the stability and load-bearing capacity of the fabric drop plate 28.

[0040] After adding a linkage structure to connect the fabric drop plate 28, due to the large weight of the fabric drop plate 28, when the base plate 2 is lowered into place, there is a risk that the fabric drop plate 28 may collide with the base plate 2 due to its inertia, or that the fabric drop plate 28 may be lowered an additional distance. Therefore, as follows... Figure 6 As shown, one of its connecting arms 31 is formed with a buffer end 32, and the wall panel 1 is equipped with a force plate 33 for the impact of the buffer end 32. The force plate 33 is fitted with a rubber block 34. Thus, by utilizing the cooperation between the rubber block 34 and the buffer end 32, the buffering of the falling cloth plate 28 when it closes is achieved, effectively eliminating the hidden dangers caused by its inertia.

[0041] The specific structure of the linkage is as follows, such as Figure 6 , Figure 7 As shown, the linkage structure includes a pry arm 35 mounted on the lever 30 and a linkage arm 36 bolted to the connecting plate 26. The bottom end of the linkage arm 36 is rotatably connected to a push roller 37 and an lift roller 38, which clamp the pry arm 35 from above and below. When the base plate 2 and the connecting plate 26 rise synchronously, the lift roller 38 applies an upward pushing force to the inclined lower surface of the pry arm 35, thereby pushing the pry arm 35 to gradually tilt upward. This, in turn, drives the upper part of the fabric dropping plate 28 to flip outward through the lever principle, opening the space above the base plate 2 and ensuring the smooth rise of the base plate 2. When the base plate 2 and the connecting plate 26 fall synchronously, the push roller 37 applies downward pressure to the inclined upper surface of the pry arm 35, thereby initiating the inward flipping of the upper part of the fabric dropping plate 28 through the lever principle. This continues until the base plate 2 falls to a predetermined height, completing the closure of the space above the base plate 2 to meet the fabric dropping guidance requirements.

[0042] After the linkage between the bottom plate 2 and the fabric drop plate 28, there are high requirements for the synchronization of their positions. Therefore, as follows: Figure 7 , Figure 8 As shown, the connecting plate 26 has a vertical adjustment groove 39, and the linkage arm 36 has a through hole 40 corresponding to the vertical adjustment groove 39. A vertical adjustment bolt 41 is provided through the vertical adjustment groove 39 and the through hole 40, and the vertical adjustment bolt 41 is fitted with a vertical adjustment nut 42. After loosening the vertical adjustment nut 42, the height position of the linkage arm 36 can be adjusted, thereby adjusting the position of the fabric drop plate 28 by the push roller 37 and the lift roller 38, ensuring that the fabric drop plate 28 is in a closed state when the bottom plate 2 is lowered to the predetermined position.

[0043] The specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A lifting device for a bottom plate, comprising two wall panels (1), a bottom plate (2) disposed between the two wall panels (1), and a transmission mechanism for driving the lifting plate (2) to rise and fall, characterized in that: The two wall panels (1) are vertically mounted with an initial optical axis (3) and an additional optical axis (4). The initial optical axis (3) and the additional optical axis (4) are respectively slidably sleeved with an initial sliding sleeve (5) and an additional sliding sleeve (6). The bottom plate (2) is provided with a lower extension arm (7) at its end. The lower extension arm (7) is fixed with the initial sliding sleeve (5) and the additional sliding sleeve (6). The transmission mechanism includes an output motor (8) mounted on any wall panel (1), a long shaft (9) rotatably connected between two wall panels (1), an active synchronous pulley (10) set on the long shaft (9), a driven synchronous pulley (11) rotatably mounted on the wall panel (1), and a synchronous belt (12) wound around the active synchronous pulley (10) and the driven synchronous pulley (11). A sprocket assembly (13) is provided between the output motor (8) and the long shaft (9) for transmission. The synchronous belt (12) is fixed to the initial sliding sleeve (5) at any position. The active synchronizing wheel (10) and the driven synchronizing wheel (11) are arranged at both ends of the initial optical axis (3). The added optical axis (4) and the added sliding sleeve (6) are designed to extend downward. The length of the added sliding sleeve (6) is twice that of the initial sliding sleeve (5), and the upper end face of the added sliding sleeve (6) is flush with the upper end face of the initial sliding sleeve (5). The downward extension of the added optical axis (4) is the length difference between the added sliding sleeve (6) and the initial sliding sleeve (5). A connecting plate (26) is bolted between the initial sliding sleeve (5) and the additional sliding sleeve (6). The connecting plate (26) has a vertical plate (27) in the area of ​​the initial sliding sleeve (5). The vertical plate (27) is bolted to the lower extension arm (7).

2. The bottom plate lifting device according to claim 1, characterized in that: The long shaft (9) includes a long shaft section (14) and a short shaft section (15). One end of the long shaft section (14) is provided with a keyway (16) for mounting the driven sprocket and the driving synchronous pulley (10) of the sprocket assembly (13). One end of the short shaft section (15) is provided with a keyway (16) for mounting another driving synchronous pulley (10). The opposite ends of the long shaft section (14) and the short shaft section (15) are respectively provided with a semi-circular portion (171), and the planes of the two semi-circular portions (171) fit together. The opposite ends of the long shaft section (14) and the short shaft section (15) are provided with a sleeve (17), and the sleeve (17) is provided with a sleeve bolt (18) for controlling slack.

3. The bottom plate lifting device according to claim 1, characterized in that: Each of the active synchronous pulleys (10) is connected to two driven synchronous pulleys (11). The wall panel (1) is equipped with an inner assembly plate (19). The inner assembly plate (19) is provided with tension adjustment grooves (20) for each of the two driven synchronous pulleys (11). The tension adjustment grooves (20) are slidably connected to a wheel axle pins (21). The wheel axle pins (21) are provided with bearings (22) and connected to the driven synchronous pulleys (11). The wheel axle pins (21) are provided with end heads (23). The end face of the end head (23) is provided with a threaded section (24). The threaded section (24) is threadedly fitted with a locking nut (25). The locking nut (25) and the end head (23) clamp the inner assembly plate (19).

4. The bottom plate lifting device according to claim 1, characterized in that: A drop plate (28) is oscillating between the two wall panels (1), and a linkage structure is provided between the drop plate (28) and the connecting plate (26).

5. The bottom plate lifting device according to claim 4, characterized in that: The fabric plate (28) is provided with flanged sheet metal (29) on both sides. The wall panel (1) is swayed and connected with a lever (30). The lever (30) is provided with two connecting arms (31) at the rotation center. The ends of the two connecting arms (31) are fixed to the flanged sheet metal (29).

6. The bottom plate lifting device according to claim 5, characterized in that: The connecting arm (31) is provided with a buffer end (32), and the wall panel (1) is provided with a force plate (33) for the buffer end (32) to impact. The force plate (33) is provided with a rubber block (34).

7. A bottom plate lifting device according to claim 5, characterized in that: The linkage structure includes a pry bar (35) mounted on the lever (30) and a linkage arm (36) mounted on the connecting plate (26). The bottom end of the linkage arm (36) is rotatably connected to a push roller (37) and an lift roller (38). The push roller (37) and the lift roller (38) clamp the pry bar (35) from above and below. The connecting plate (26) is provided with a vertical adjustment groove (39). The linkage arm (36) is provided with a through hole (40) corresponding to the vertical adjustment groove (39). A vertical adjustment bolt (41) is provided through the vertical adjustment groove (39) and the through hole (40). The vertical adjustment bolt (41) is fitted with a vertical adjustment nut (42).

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