A cigarette maker leveler

Abstract

The application discloses a cigarette machine leveler, which comprises a box, a box bottom plate and a mounting bottom plate, the box and the box bottom plate are fixedly connected, and the box is fixed on the mounting bottom plate; a hob mechanism and two leveler disc mechanisms are installed on the box, a leveler disc spacing adjusting mechanism is arranged in the box, the leveler disc mechanism and the hob mechanism are further connected with a driving input mechanism and a driving mechanism, and the leveler disc spacing adjusting mechanism is used for adjusting the spacing of the two leveler disc mechanisms. The leveler disc spacing adjusting mechanism can be used for adjusting the spacing of the two leveler discs, so that the tightness of the tobacco of the cigarette head can be adjusted. Compared with the existing spacing adjusting operation mode of the Z17 cigarette machine leveler, the spacing of the leveler discs can be adjusted by externally operating the leveler disc spacing adjusting mechanism, so that the operator can quickly adjust the spacing of the leveler discs.

Description

Technical Field

[0001] This invention relates to the field of tobacco production and manufacturing, and specifically to a cigarette machine leveler. Background Technology

[0002] The main function of the cigarette machine leveler assembly is to evenly divide the tobacco in the cigarette and precisely adjust the tobacco density, so that the tobacco density at the end of the cigarette is slightly higher than that in the middle section. By using the slightly higher density tobacco at the end of the cigarette with a uniform diameter, the tobacco is fixed in place, preventing the tobacco from slipping off due to insufficient density and causing the cigarette to be empty. This equipment is one of the important process steps in the tobacco's movement before it enters the cigarette paper, and it directly affects the tobacco conveying.

[0003] The cigarette machine leveler is a specialized device designed to tighten the tobacco during the cigarette forming process. The cigarette tightening point consists of two specially shaped leveling discs rotating in opposite directions on the same plane. The existing Z17 cigarette machine leveler has the following problems:

[0004] 1. The distance between the two flat discs determines the tightness of the tobacco in the cigarette holder. The traditional process of adjusting the distance between the two flat discs is relatively complicated, and operators cannot quickly adjust the distance between the flat discs.

[0005] 2. The transmission design of the existing cigarette machine leveler adopts multi-stage gear transmission and toothed belt transmission. Due to the limited working temperature and humidity environment and the long service life and aging of the seals, the lubricating oil in the gearbox is prone to leakage. The leakage is not easy to be detected. The oil stains directly act on the tobacco conveyor through the leveler assembly, causing tobacco contamination and affecting the quality of the tobacco.

[0006] 3. Gear transmission has a certain gap between the teeth. When the two flat discs run synchronously, deviation will occur, resulting in compaction end error. This can easily lead to hollow cigarettes and affect the quality of the tobacco. Summary of the Invention

[0007] To address the aforementioned shortcomings of the prior art, this invention provides a cigarette machine leveler with adjustable leveling disc spacing to improve tobacco quality.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows: it includes a housing, a housing base plate, and a mounting base plate, the housing and the housing base plate are fixedly connected, and the housing is fixed on the mounting base plate; a roller cutter mechanism and two leveling disc mechanisms are installed on the housing, and a leveling disc spacing adjustment mechanism is provided inside the housing; the leveling disc mechanism and the roller cutter mechanism are also connected to a drive input mechanism and a drive mechanism, and the leveling disc spacing adjustment mechanism is used to adjust the spacing between the two leveling disc mechanisms.

[0009] Furthermore, the drive input mechanism includes a gear shaft, and a flattening disc output pulley, a motor input pulley, a vertical bearing seat, and a hob output bevel gear fixed on the gear shaft. The hob output bevel gear is installed on the upper part of the gear shaft, and the flattening disc output pulley and the motor input pulley are installed on the lower part of the gear shaft. The flattening disc mechanism includes a flattening disc shaft, and a flattening disc, a wire baffle, a flattening disc sleeve, a synchronous pulley, and a bearing seat fixed on the flattening disc shaft. The synchronous pulley is connected to the flattening disc output pulley through a flattening disc synchronous belt. The two synchronous pulleys mesh with the inner and outer rings of the flattening disc synchronous belt, respectively. The flattening disc mechanism is fixed to the housing through the bearing seat. The housing is also provided with a strip hole for installing the flattening disc shaft.

[0010] Furthermore, the leveling disc spacing adjustment mechanism includes two parallel guide rails fixed on the housing, with a left slider and a right slider running through the guide rails; a double-ended lead screw is also provided between the two guide rails, the double-ended lead screw is parallel to the guide rails, the middle part of the double-ended lead screw is fixed to the housing by a lead screw support limit block, the two ends of the double-ended lead screw are threaded to the left slider and the right slider respectively, the two threads on the double-ended lead screw have opposite directions of rotation, and one end of the double-ended lead screw extends out of the housing and is fixed with a spacing adjustment knob.

[0011] Furthermore, the hobbing mechanism includes a hobbing shaft, a hobbing input bevel gear, a hobbing cutter, and a hobbing cutter sleeve fixed on the hobbing shaft. The hobbing cutter sleeve is fitted over the hobbing shaft and fixed to the housing. The hobbing cutter and the hobbing input bevel gear are respectively located at both ends of the hobbing shaft, and the hobbing input bevel gear meshes with the hobbing output bevel gear. A mounting base for mounting the hobbing shaft is also fixed inside the hobbing cutter sleeve. A limit part is provided on the right side of the hobbing shaft located on the mounting base, and a disc-shaped spring plate is provided between the limit part and the mounting base.

[0012] Furthermore, the tensioning mechanism includes a tensioning swing arm, the middle part of which is fixed to the housing via a swing arm pivot. One end of the tensioning swing arm is equipped with a tension pulley, which meshes with the inner ring of the timing belt of the leveling disc. The other end of the tensioning swing arm is provided with a tension hook, one end of which is connected to a tension spring, and the other end of which is fixed to the housing.

[0013] Furthermore, the drive mechanism includes a drive motor, a main drive pulley, and an output synchronous belt. The drive motor is fixed on the bottom plate of the housing, and the drive motor is fixedly connected to the main drive pulley. The main drive pulley is connected to the motor input pulley through the output synchronous belt.

[0014] Furthermore, a motor pitch adjustment mechanism is also provided on the bottom plate of the housing. The motor pitch adjustment mechanism includes a fixing block fixed to the outside of the bottom plate of the housing. An adjusting screw is provided on the fixing block along the radial direction of the drive motor. The adjusting screw is threadedly connected to the fixing block. A strip-shaped mounting hole is provided on the side of the drive motor. The axial direction of the adjusting screw is parallel to the length direction of the strip-shaped mounting hole. The pushing direction of the adjusting screw is consistent with the tensioning direction of the timing belt of the flat disc.

[0015] Furthermore, the mounting base plate is provided with a positioning shaft for mounting the housing and a positioning sleeve for mounting the positioning shaft. The positioning shaft is fixed to the mounting base plate through the positioning sleeve, and one end of the positioning shaft is fixedly connected to the housing. The positioning shaft is L-shaped.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention allows for adjustment of the distance between two flattening discs via a flattening disc spacing adjustment mechanism, thereby adjusting the tightness of the tobacco in the cigarette holder. Compared to the existing method of adjusting the distance of the Z17 cigarette machine flattener, this invention enables the adjustment of the flattening disc distance through an externally operated flattening disc spacing adjustment mechanism, making it convenient for operators to quickly adjust the flattening disc distance.

[0018] This invention is applied to the Z17 cigarette machine leveler assembly. Its main function is to evenly divide the tobacco in the cigarette and precisely adjust the tobacco density, so that the tobacco density at the end of the cigarette is slightly higher than that in the middle section. By fixing the tobacco at the end of the cigarette with slightly higher density tobacco, it can effectively prevent the tobacco from slipping off due to insufficient density, resulting in a hollow cigarette end. This invention uses a synchronous belt drive, and the housing and bottom plate form a sealed chamber, eliminating the possibility of lubricating oil contaminating the tobacco, thus further ensuring the quality of the tobacco.

[0019] This invention modifies the leveling drive of the Z17 cigarette machine to achieve servo-driven leveling drive. The original toothed belt drive chain is eliminated, and servo drive controls the leveling drive, reducing oil leakage, achieving more precise leveling drive, reducing compaction end error, and thus reducing the defect rate of empty cigarette heads.

[0020] This invention allows for structural modification of the leveling assembly without damaging the original machine structure. The designed leveling assembly does not interfere with other electrical control equipment or mechanical equipment and is applicable to the existing Z17 cigarette machine. The leveling disc mechanism can be replaced and adjusted according to different cigarette specifications. The distance between the leveling disc and the suction chamber, as well as the tilt angle of the leveling disc, can all be adjusted. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the external shape of the present invention;

[0022] Figure 2 This is a schematic diagram of the external shape of the invention from another direction;

[0023] Figure 3 This is a schematic diagram of the external shape of the leveling disc mechanism components;

[0024] Figure 4 This is a schematic diagram of the flattening disc spacing adjustment mechanism;

[0025] Figure 5 A schematic diagram of the external shape of the drive input mechanism;

[0026] Figure 6 This is a schematic diagram of the tensioning mechanism.

[0027] Figure 7 This is a schematic diagram of the hobbing mechanism.

[0028] Figure 8 This is a top view of the hobbing mechanism;

[0029] Figure 9 for Figure 8 AA section view in the middle;

[0030] Figure 10 This is a front view of the present invention;

[0031] Figure 11 This is a CC cross-sectional view of the present invention;

[0032] Figure 12 This is a front view of the mounting base plate.

[0033] Figure 13 Side view of the mounting base plate;

[0034] The symbols for each component are as follows;

[0035] 1. Base plate; 2. Enclosure; 3. Enclosure base plate; 11. Positioning sleeve; 12. Positioning pivot;

[0036] 4. Leveling disc mechanism; 41. Leveling disc; 42. Wire baffle; 43. Leveling disc sleeve; 44. Synchronous pulley; 45. Leveling disc shaft; 46. Leveling disc synchronous belt; 47. Bearing housing;

[0037] 5. Leveling disc spacing adjustment mechanism; 51. Left slider; 52. Right slider; 53. Guide rail; 54. Lead screw; 55. Lead screw support limit block; 56. Adjustment knob;

[0038] 6. Hobbing mechanism; 61. Hobbing shaft; 62. Hobbing input bevel gear; 63. Hobbing cutter; 64. Disc spring; 65. Hobbing sleeve; 66. Mounting base; 67. Hobbing shaft mounting key;

[0039] 7. Drive input mechanism; 71. Gear shaft; 72. Flat disc output pulley; 73. Motor input pulley; 74. Vertical bearing housing; 75. Hob output bevel gear;

[0040] 8. Tensioning mechanism; 81. Tensioning pulley; 82. Tensioning rocker arm; 83. Tensioning hook; 84. Rocker arm pivot; 85. Tensioning spring;

[0041] 9. Drive mechanism; 91. Drive motor; 92. Output synchronous belt; 93. Main drive pulley; 10. Motor pitch adjustment mechanism. Detailed Implementation

[0042] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0043] like Figure 1 and 2 As shown, the cigarette machine leveler includes a housing 2, a housing base plate 3, and a mounting base plate 1. The housing 2 and the housing base plate 3 are fixedly connected, and the housing 2 is fixed on the mounting base plate 1. The housing 2 is groove-shaped, and the housing 2 and the mounting base plate 1 form a sealed chamber. A roller cutter mechanism 6 and two leveling disc mechanisms 4 are installed on the housing 2. A leveling disc spacing adjustment mechanism 5 is provided inside the housing 2. The leveling disc mechanism 4 and the roller cutter mechanism 6 are also connected to a drive input mechanism 7 and a drive mechanism 9. The leveling disc spacing adjustment mechanism 5 is used to adjust the spacing between the two leveling disc mechanisms 4.

[0044] like Figure 3 As shown, the leveling disc mechanism 4 includes a leveling disc shaft 45, and a leveling disc 41, a baffle plate 42, a leveling disc sleeve 43, a timing pulley 44, and a bearing seat 47 fixed on the leveling disc shaft 45. The timing pulley 44 is connected to the leveling disc output pulley 72 via a leveling disc timing belt 46. The two timing pulleys 44 respectively mesh with the inner and outer rings of the leveling disc timing belt 46. The leveling disc mechanism 4 is fixed to the housing 2 via the bearing seat 47. The housing 2 is also provided with a strip hole for mounting the leveling disc shaft 45. The baffle plate 42 adopts a shaft-mounted installation method, which can achieve omnidirectional and multi-angle adjustment to block tobacco splatter as much as possible.

[0045] like Figure 4As shown, the leveling disc spacing adjustment mechanism 5 includes two parallel guide rails 53 fixed to the housing 2. A left slider 51 and a right slider 52 are threaded through the guide rails 53. A double-ended lead screw 54 is also provided between the two guide rails 53. The double-ended lead screw 54 is parallel to the guide rails 53. The middle part of the double-ended lead screw 54 is fixed to the housing 2 by a lead screw support limit block 55. The two ends of the double-ended lead screw 54 are threadedly connected to the left slider 51 and the right slider 52 respectively. The two threads on the double-ended lead screw 54 have opposite directions of rotation. One end of the double-ended lead screw 54 extends out of the housing 2 and is fixed with an adjustment knob 56. The optimized internal structure of this invention simplifies the work difficulty in operation, maintenance, repair, and modification. The leveling disc spacing can be adjusted simply by rotating the adjustment knob 56 on the outside of the housing 2. This invention can not only adjust the spacing of the flattening discs 41 using the flattening disc spacing adjustment mechanism 5, but also replace the special flattening discs 41 for different cigarette specifications and adjust the spacing of the flattening discs 41 to meet the flattening processing of different cigarette specifications.

[0046] like Figure 5 As shown, the drive input mechanism 7 includes a gear shaft 71, and a flat disc output pulley 72, a motor input pulley 73, a vertical bearing seat 74, and a hob output bevel gear 75 fixed on the gear shaft 71. The hob output bevel gear 75 is mounted on the upper part of the gear shaft 71, and the flat disc output pulley 72 and the motor input pulley 73 are mounted on the lower part of the gear shaft 71.

[0047] like Figure 6 As shown, the tensioning mechanism 8 is used to tension the leveling disc synchronous belt 46, ensuring the accuracy of the entire transmission system. The tensioning mechanism 8 includes a tensioning lever 82, the middle of which is fixed to the housing 2 via a lever shaft 84. A tensioning pulley 81 is mounted at one end of the tensioning lever 82, engaging with the inner ring of the leveling disc synchronous belt 46. A tension hook 83 is provided at the other end of the tensioning lever 82, with a tension spring 85 connected to one end of the hook 83. The other end of the tension spring 85 is fixed to the housing 2. The tension of the leveling disc synchronous belt 46 can also be automatically adjusted by the tension spring 85, thereby improving the production efficiency of cigarette products.

[0048] like Figure 7 , 8 As shown in Figure 9, the hobbing mechanism 6 includes a hobbing shaft 61, a hobbing input bevel gear 62, a hobbing cutter 63, and a hobbing cutter sleeve 65 fixed on the hobbing shaft 61. The hobbing cutter sleeve 65 is sleeved on the outside of the hobbing shaft 61 and is fixed on the housing 2. The hobbing cutter 63 and the hobbing input bevel gear 62 are respectively located at both ends of the hobbing shaft 61, and the hobbing input bevel gear 62 meshes with the hobbing output bevel gear 75. A mounting base 66 for mounting the hobbing shaft 61 is also fixed inside the hobbing sleeve 65. A limiting part is provided on the right side of the hobbing shaft 61 located on the mounting base 66, and a disc-shaped spring plate 64 is also provided between the limiting part and the mounting base 66.

[0049] like Figure 10 and 11 As shown, the drive mechanism 9 includes a drive motor 91, a main drive pulley 93, and an output synchronous belt 92. The drive motor 91 is fixed on the bottom plate 3 of the housing and is fixedly connected to the main drive pulley 93. The main drive pulley 93 is connected to the motor input pulley 73 through the output synchronous belt 92. The drive motor 91 is preferably a servo motor. The structure of using a servo motor with synchronous belt drive efficiently, intelligently, and precisely completes the original equipment operation while eliminating the possibility of oil contamination of cigarettes. It also optimizes space utilization and allows for more convenient equipment adjustments. Simply replacing specialized parts and making local adjustments can meet the switching needs of various cigarette product specifications, simplifying operation and saving users' modification and debugging time. The drive mechanism of this invention occupies little space, has good torque-frequency characteristics, high control precision, and is easy to control.

[0050] like Figure 10 As shown, a motor adjustment mechanism 10 is also provided on the bottom plate 3 of the housing. The motor adjustment mechanism 10 is used to adjust the position of the drive motor 91 so that the drive motor 91 further tensions the output synchronous belt 92. The motor adjustment mechanism 10 includes a fixing block fixed on the outside of the bottom plate 3 of the housing. An adjusting screw is provided on the fixing block along the radial direction of the drive motor 91. The adjusting screw is threadedly connected to the fixing block. A strip-shaped mounting hole is provided on the side of the drive motor 91. The axial direction of the adjusting screw is parallel to the length direction of the strip-shaped mounting hole. The pushing direction of the adjusting screw is consistent with the tensioning direction of the flat disc synchronous belt 46.

[0051] like Figure 12 and 13 As shown, the mounting base plate 1 is used to connect with the original Z17 cigarette machine. The mounting base plate 1 is equipped with a positioning shaft 12 for mounting the housing 2 and a positioning sleeve 11 for mounting the positioning shaft 12. The positioning shaft 12 can rotate within the positioning sleeve 11 and is fixed to the mounting base plate 1 through the positioning sleeve 11. One end of the positioning shaft 12 is fixedly connected to the housing 2. The positioning shaft 12 is L-shaped. A rotating locking part 121 is provided on the side of the positioning shaft 12 that mates with the housing 2. The positioning sleeve 11 has a flange edge and is fixedly connected to the mounting base plate 1 by several screws. The positioning shaft 12 is fixed inside the positioning sleeve 11. A rotating screw 122 is fixedly connected to the end of the positioning shaft 12 away from the housing 2. By rotating the rotating screw 122, the positioning shaft 12 and the rotating locking part 121 are driven to rotate, thereby driving the housing 2 to rotate through the positioning shaft 12, realizing the precise positioning function of the original machine's leveler rotation and swing angle.

[0052] The servo motor is preferably 750W in power and is controlled by a motion controller or PLC. The encoder resolution is 2500PPR, and the PLC is a Siemens S7-1200. A Weintek 7-inch touchscreen is used for setting control parameters. This invention can achieve cigarette tightening head tracking and correct the cigarette tightening head offset via the touchscreen. The servo drive system can automatically calibrate the leveling disc's zero position and precise phase, and can more quickly and automatically adjust the leveling disc's rotation speed via electrical control signals.

[0053] Working principle and process of leveling disc 41 and roller cutter 63: During operation, the main transmission pulley 93 on the drive motor 91 drives the motor input pulley 73 to rotate through the output synchronous belt 92, thereby driving the gear shaft 71 and its leveling disc output pulley 72 and roller cutter output bevel gear 73 to rotate; the leveling disc output pulley 72 drives the synchronous pulley 44 and tension pulley 81 to rotate through the leveling disc synchronous belt 46, thereby realizing that the synchronous pulley 44 drives the leveling disc 41 to rotate, so that the two leveling discs 41 rotate synchronously in opposite directions; the roller cutter output bevel gear 73 meshes with the roller cutter input bevel gear 62, thereby driving the roller cutter 63 on the roller cutter shaft 61 to rotate, thereby cutting the tobacco.

[0054] The working principle and process of the leveling disc spacing adjustment mechanism 5: By rotating the adjustment knob 56 outside the housing 2, the screw 54 is driven to rotate. The screw 54 drives the left slider 51 and right slider 52 located on both sides to move closer or further apart. The left slider 51 and right slider 52 drive their respective leveling disc mechanisms 4 to move, thereby realizing the adjustment of the spacing of the leveling disc 41.

Claims

1. A cigarette maker leveler characterized by, The utility model provides a kind of flat disc spacing adjusting mechanism, including box (2), box bottom plate (3) and installation bottom plate (1), the box (2) and box bottom plate (3) fixed connection, the box (2) is fixed on installation bottom plate (1);The box (2) is equipped with hob mechanism (6) and two place flat disc mechanism (4), the box (2) is provided with flat disc spacing adjusting mechanism (5) inside, the flat disc mechanism (4) and hob mechanism (6) are also connected with drive input mechanism (7), drive mechanism (9), the flat disc spacing adjusting mechanism (5) is used to adjust the spacing of two place flat disc mechanism (4); The flat disc spacing adjusting mechanism (5) includes two parallel guide rails (53) fixed on the box (2), the guide rails (53) are provided with left slider (51) and right slider (52) penetratingly, two guide rails (53) are further provided with double-end screw rod (54) in the middle, the double-end screw rod (54) is parallel to the guide rail (53), the middle part of the double-end screw rod (54) is fixed on the box (2) by screw rod support limiting block (55), the two ends of the double-end screw rod (54) are threadedly connected with the left slider (51) and the right slider (52) respectively, the thread rotation directions of the two threads on the double-end screw rod (54) are opposite, one end of the double-end screw rod (54) extends out of the box (2) and is fixed with a pitch adjusting knob (56); The hob mechanism (6) includes hob shaft (61), hob input bevel gear (62) fixed on the hob shaft (61), hob (63) and hob sheath (65), the hob sheath (65) is sleeved outside the hob shaft (61), and the hob sheath (65) is fixed on the box (2); the hob (63) and the hob input bevel gear (62) are arranged at the two ends of the hob shaft (61) respectively; the hob sheath (65) is further fixed with a mounting seat (66) mounting the hob shaft (61) inside, the hob shaft (61) is provided with a limiting portion on the right side of the mounting seat (66), and a disc spring sheet (64) is further arranged between the limiting portion and the mounting seat (66); The installation bottom plate (1) is provided with a positioning shaft (12) mounting the box (2) and a positioning sheath (11) mounting the positioning shaft (12), the positioning shaft (12) is fixed on the installation bottom plate (1) by the positioning sheath (11), and one end of the positioning shaft (12) is fixedly connected with the box (2); the positioning shaft (12) is L-shaped.

2. The cigarette maker calibrator of claim 1, wherein, The drive input mechanism (7) includes gear shaft (71), flat disc output pulley (72), motor input pulley (73), vertical bearing seat (74) and hob output bevel gear (75) fixed on the gear shaft (71), the hob output bevel gear (75) is mounted on the upper part of the gear shaft (71), and the flat disc output pulley (72) and the motor input pulley (73) are mounted on the lower part of the gear shaft (71); The flattening disc mechanism (4) comprises a flattening disc shaft (45), a flattening disc (41), a wire blocking plate (42), a flattening disc sheath (43), a synchronous pulley (44) and a bearing seat (47) fixed on the flattening disc shaft (45), the synchronous pulley (44) is connected with a flattening disc output pulley (72) through a flattening disc synchronous belt (46), and the two synchronous pulleys (44) are respectively engaged with the inner and outer rings of the flattening disc synchronous belt (46); the box body (2) is provided with a strip-shaped hole for mounting the flattening disc shaft (45).

3. The cigarette maker polisher of claim 1, wherein, The tensioning mechanism (8) for tensioning the flattening disc synchronous belt (46) is further included, the tensioning mechanism (8) comprises a tensioning swing rod (82), the middle part of the tensioning swing rod (82) is fixed on the box body (2) through a swing rod rotating shaft (84), one end of the tensioning swing rod (82) is provided with a tensioning pulley (81); the other end of the tensioning swing rod (82) is provided with a tensioning pull hook (83), one end of the tensioning pull hook (83) is connected with a tensioning pull spring (85), and the other end of the tensioning pull spring (85) is fixed on the box body (2).

4. The cigarette maker calibrator of claim 1, wherein, The driving mechanism (9) comprises a driving motor (91), a main transmission pulley (93) and an output synchronous belt (92), the driving motor (91) is fixed on the box body bottom plate (3), the driving motor (91) is fixedly connected with the main transmission pulley (93), and the main transmission pulley (93) is connected with the motor input pulley (73) through the output synchronous belt (92).

5. The cigarette maker calibrator of claim 3, wherein, The box body bottom plate (3) is further provided with a motor distance adjusting mechanism (10), the motor distance adjusting mechanism (10) comprises a fixed block fixed on the outer side of the box body bottom plate (3), an adjusting screw is arranged on the fixed block in the radial direction of the driving motor (91), and the adjusting screw is threadedly connected with the fixed block; a strip-shaped mounting hole is arranged on the side of the driving motor (91), the axis direction of the adjusting screw is parallel to the length direction of the strip-shaped mounting hole, and the extrusion direction of the adjusting screw is consistent with the tensioning direction of the flattening disc synchronous belt (46).

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