A conveying bagging machine for cement production

Abstract

The present invention discloses a conveying and bagging machine for cement production, which relates to the technical field of cement packaging. It includes a base plate, a steering wheel coaxially fixed on a rotating shaft, a radial sliding drive component for driving a radial slider to move linearly back and forth, a spacing adjustment component for driving two electric suction cups to move toward or away from each other is installed on the extension frame, a sliding bag-moving component for moving the packaging bag toward the extension frame is installed on the connecting block, and a material guide tube is fixed on the end of the translation frame away from the connecting block, and the material guide tube is horizontally opposite to the opening of the packaging bag; the present invention can drive the steering wheel to rotate in a step-by-step manner through the step-by-step rotation drive component provided, so that the packaging bag on the storage slot rotates in a step-by-step manner, and the radial sliding drive component provided can make the packaging bag extend toward one side of the material guide tube, so that multiple packaging bags can be switched one by one at the workstation, and the packaging bags can achieve automatic conveying effect, which greatly improves the efficiency of the cement bagging operation.

Description

Technical Field

[0001] The invention relates to the technical field of cement packaging, in particular to a conveying bagging machine for cement production. Background Art

[0002] Cement is a powdered, hydraulic, inorganic binder. When mixed with water, it forms a slurry that hardens in air or water, firmly bonding materials like sand and stone. Early lime-pozzolana mixtures are very similar to modern lime-pozzolana cement. Using it to bond crushed stone concrete, it not only provides high strength after hardening but also resists erosion by fresh or salt water. Cement has long been a key binder, widely used in civil engineering, water conservancy projects, and other fields.

[0003] When packaging powdered cement, a material guide tube connected to the cement to be packaged extends from the opening of the packaging bag into the packaging bag for cement packaging. At present, the packaging bag and the material guide tube are generally connected in a manner that manually holds the packaging bag and moves the opening of the packaging bag relative to the material guide tube to achieve the docking operation of bagging. However, during the above docking operation, the staff needs to manually pull the packaging bag, which is initially in a compressed state, to open the opening of the packaging bag so that the material guide tube is docked with the opening. The above operation process is time-consuming and labor-intensive. At the same time, it is difficult to dock the material guide tube with the packaging bag, and it is impossible to realize automatic transportation of the packaging bag and automatic docking of the opening with the material guide tube. The cement bagging effect is not good. In view of the above technical defects of the prior art, a conveying and bagging machine for cement production is provided to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a conveying bagging machine for cement production to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A conveying bagging machine for cement production includes a base plate, a support frame and a bearing platform are fixed on the base plate, a vertical plate is fixed on the bearing platform, a vertical rotating shaft is rotatably installed on the support frame, a steering wheel is coaxially fixed on the rotating shaft, a plurality of radial sliders uniformly distributed in an annular direction are slidably installed on the steering wheel, a radial spring is fixed between the radial slider and the steering wheel, a receiving groove is fixed on each of the radial sliders, a packaging bag is vertically placed in the receiving groove, a stepping rotary drive assembly is installed on the base plate, the stepping rotary drive assembly is used to drive the rotating shaft to rotate step by step, a vertical sliding sleeve is vertically slidably installed on the rotating shaft, and a radial sliding drive assembly is installed on the vertical sliding sleeve Part, the radial sliding drive assembly is used to drive the radial slider to move linearly back and forth, a servo motor is fixed on the vertical plate, and the output shaft of the servo motor is coaxially fixed with a threaded rod threadedly connected to the translation frame, and a connecting block is fixed on the vertical plate. An extension frame is fixed on the vertical plate, and a pair of electric suction cups for adsorbing the side walls of the packaging bag are installed on the extension frame, and a spacing adjustment assembly for driving the two electric suction cups to move toward or away from each other is installed on the extension frame, and a sliding bag-moving assembly for moving the packaging bag toward the extension frame is installed on the connecting block, and a material guide tube is fixed on the end of the translation frame away from the connecting block, and the material guide tube is horizontally opposite to the opening of the packaging bag.

[0007] As an improved solution of the present invention: the stepping rotation drive assembly includes a driving motor fixed on the base plate, the output shaft of the driving motor is coaxially fixed with an incomplete bevel gear, and the rotating shaft is fixedly sleeved with a driven bevel gear that intermittently meshes with the incomplete bevel gear.

[0008] As an improved solution of the present invention: the radial sliding drive assembly includes a rotating wheel rotatably mounted on the base plate, the rotating wheel is connected to the output shaft of the driving motor through a pulley mechanism I, a connecting rod is eccentrically hinged on the rotating wheel, the upper end of the connecting rod is hinged on the vertical sliding sleeve, a transmission wedge is fixed at the bottom of the radial slider, and a vertical push frame is fixed on the vertical sliding sleeve, which abuts against the transmission wedge.

[0009] As an improved solution of the present invention: a friction block is slidably installed on the side wall of the vertical sliding sleeve, the friction block is in frictional contact with the rotating shaft, an extension plate is fixed on the friction block, and a push spring is fixed between the extension plate and the vertical sliding sleeve.

[0010] As an improved solution of the present invention: the sliding bag-moving assembly includes a bag-moving plate slidably mounted on a connecting block, a wedge block I is fixed to one side of the bag-moving plate, a push plate adapted to abut against the wedge block I is fixed to the radial sliding block, a wedge block II is fixed to the other side of the bag-moving plate, a reset plate adapted to abut against the wedge block II is fixed to the supporting platform, and a limiting assembly for limiting the position of the bag-moving plate is installed on the connecting block.

[0011] As an improved solution of the present invention: the limiting assembly includes a push column slidably mounted on the connecting block, one end of the push column is in frictional contact with the bag-shifting plate, the other end of the push column is fixed with a top plate, and a vertical spring is fixed between the top plate and the connecting block.

[0012] As an improved solution of the present invention: the spacing adjustment assembly includes a central gear rotatably mounted on the extension frame, and spur racks are meshed and connected on both sides of the central gear. A sliding frame is fixedly connected between the spur rack and the electric suction cup, and the sliding frame is slidably connected to the extension frame.

[0013] As an improved solution of the present invention: the spacing adjustment assembly also includes a sliding rack fixed on the translation frame, and a transmission gear that meshes with the sliding rack is rotatably installed on the vertical plate, and a pulley mechanism II is connected between the transmission gear and the central gear.

[0014] As an improved solution of the present invention: a drop hole vertically corresponding to the extension frame is opened on the supporting platform, and a support plate is installed below the drop hole. A deflection shaft rotatably installed on the supporting platform is fixed on one side of the support plate, a worm gear is coaxially fixed on the deflection shaft, and a worm is meshedly connected to the worm gear.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention provides a step-by-step rotation drive component that can drive the steering wheel to rotate step by step, so that the packaging bags on the storage slot can rotate step by step, and the radial sliding drive component can make the packaging bags extend toward the side of the guide pipe, so that multiple packaging bags can be switched one by one at the workstations, and the packaging bags can achieve automatic conveying effect, which greatly improves the efficiency of the cement bagging operation.

[0017] The sliding bag-moving assembly provided in the present invention can move the packaging bags on the storage slot one by one between the two electric suction cups. With the help of the translation frame sliding toward the material guide tube, the spacing adjustment assembly is driven, so that the two electric suction cups adsorb the side walls of the packaging bag and move away from each other, thereby pulling the packaging bag sideways, so that the opening of the packaging bag is opened, and the material guide tube extends to the interior of the packaging bag to significantly improve the operational accuracy and efficiency of cement packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 For the present invention Figure 1 A magnified schematic diagram of part A in the middle;

[0020] Figure 3 For the present invention Figure 1 Schematic diagram from a certain perspective;

[0021] Figure 4 For the present invention Figure 2 A magnified schematic diagram of part B in the middle;

[0022] Figure 5 For the present invention Figure 1 Schematic diagram from another perspective;

[0023] Figure 6 It is a structural schematic diagram of the sliding bag-moving assembly in the present invention;

[0024] Figure 7 This is a schematic diagram of the connection between the sliding bag-moving assembly and the limiting assembly in the present invention;

[0025] Figure 8 Schematic diagram of the connection between the radial sliding drive assembly and the radial sliding block in the present invention;

[0026] Figure 9 For the present invention Figure 8 Schematic diagram of the local structure;

[0027] Figure 10 Schematic diagram of the connection between the extension frame and the spacing adjustment assembly in the present invention;

[0028] Figure 11 It is a schematic diagram of the connection between the support plate, deflection shaft, worm wheel and worm in the present invention.

[0029] In the figure: 1-bottom plate, 2-support frame, 3-carrying platform, 4-steering wheel, 5-radial slider, 6-push plate, 7-packaging bag, 8-storage slot, 9-drop hole, 10-rotating wheel, 11-vertical push frame, 12-vertical plate, 13-threaded rod, 14-servo motor, 15-material guide tube, 16-extension frame, 17-reset plate, 18-translation frame, 19-wedge block I, 20-bag shifting plate, 21-top plate, 22-vertical spring, 23-connecting block, 24-wedge block II, 25-push column, 26-snail Rod, 27-electric suction cup, 28-rotating shaft, 29-pulley mechanism I, 30-incomplete bevel gear, 31-driven bevel gear, 32-vertical sliding sleeve, 33-driving motor, 34-radial spring, 35-connecting rod, 36-friction block, 37-transmission wedge, 38-extension plate, 39-thrust spring, 40-transmission gear, 41-pulley mechanism II, 42-spur rack, 43-sliding frame, 44-worm gear, 45-center gear, 46-support plate, 47-deflection shaft, 48-sliding rack. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments:

[0031] Example 1

[0032] See also Figure 1-11 A conveying bagging machine for cement production includes a base plate 1, a support frame 2 and a bearing platform 3 are fixed on the base plate 1, a vertical plate 12 is fixed on the bearing platform 3, a vertical rotating shaft 28 is rotatably installed on the support frame 2, a steering wheel 4 is coaxially fixed on the rotating shaft 28, a plurality of radial sliders 5 evenly distributed in an annular direction are slidably installed on the steering wheel 4, a radial spring 34 is fixed between the radial slider 5 and the steering wheel 4, a receiving groove 8 is fixed on each radial slider 5, a packaging bag 7 is vertically placed in the receiving groove 8, a stepping rotary drive assembly is installed on the base plate 1, and the stepping rotary drive assembly is used to drive the rotating shaft 28 to rotate step by step, a vertical sliding sleeve 32 is vertically slidably installed on the rotating shaft 28, and a radial sliding drive assembly is installed on the vertical sliding sleeve 32 The radial sliding drive assembly is used to drive the radial slider 5 to move linearly back and forth. A servo motor 14 is fixed on the vertical plate 12. The output shaft of the servo motor 14 is coaxially fixed with a threaded rod 13 threadedly connected to the translation frame 18. A connecting block 23 is fixed on the translation frame 18. An extension frame 16 is fixed on the vertical plate 12. A pair of electric suction cups 27 for adsorbing the side walls of the packaging bag 7 are installed on the extension frame 16. A spacing adjustment assembly for driving the two electric suction cups 27 to move toward or away from each other is installed on the extension frame 16. A sliding bag-moving assembly for moving the packaging bag 7 toward the extension frame 16 is installed on the connecting block 23. A material guide tube 15 is fixed on the end of the translation frame 18 away from the connecting block 23. The material guide tube 15 is horizontally opposite to the opening of the packaging bag 7.

[0033] The packaging bag 7 for packaging cement is placed in the storage groove 8, and the material guide pipe 15 is connected to the cement to be packaged. With the help of the existing conveying device, the cement can be discharged from the material guide pipe 15, and the material guide pipe 15 extends from the opening of the packaging bag 7 to the inside of the packaging bag 7, thereby transporting the cement to the packaging bag 7 for bagging.

[0034] The stepping rotation drive assembly includes a driving motor 33 fixed on the base plate 1, and an incomplete bevel gear 30 is coaxially fixed to the output shaft of the driving motor 33. A driven bevel gear 31 intermittently meshing with the incomplete bevel gear 30 is fixedly sleeved on the rotating shaft 28. The radial sliding drive assembly includes a rotating wheel 10 rotatably mounted on the base plate 1, and the rotating wheel 10 is connected to the output shaft of the driving motor 33 through a pulley mechanism I29. A connecting rod 35 is eccentrically hinged on the rotating wheel 10, and the upper end of the connecting rod 35 is hinged on the vertical sliding sleeve 32. A transmission wedge 37 is fixed to the bottom of the radial slider 5, and a vertical push frame 11 abutting against the transmission wedge 37 is fixed on the vertical sliding sleeve 32.

[0035] Through the above setting, the driving motor 33 drives the incomplete bevel gear 30 to rotate, and the incomplete bevel gear 30 is intermittently engaged with the driven bevel gear 31, so that the driven bevel gear 31 drives the rotating shaft 28 and the steering wheel 4 to rotate in steps, so that the radial slider 5, the storage groove 8 and the packaging bag 7 rotate in steps, thereby realizing automatic switching of the work stations of multiple packaging bags 7.

[0036] While the driving motor 33 drives the incomplete bevel gear 30 to rotate, the output shaft of the driving motor 33 drives the wheel 10 to rotate through the pulley mechanism I29. The wheel 10 pulls the vertical sleeve 32 to reciprocate vertically through the connecting rod 35. The vertical sleeve 32 drives the vertical push frame 11 to reciprocate vertically and pushes the transmission wedge 37. At this time, the packaging bag 7 on the storage groove 8 slides toward the side of the guide tube 15, realizing the automatic bag feeding operation of multiple packaging bags 7, which can effectively improve the packaging efficiency of the packaging bags 7 for cement.

[0037] Furthermore, a friction block 36 is slidably mounted on the side wall of the vertical sliding sleeve 32. The friction block 36 frictionally abuts the rotating shaft 28. An extension plate 38 is fixed to the friction block 36, and a push spring 39 is fixed between the extension plate 38 and the vertical sliding sleeve 32. During the relative rotation and sliding of the vertical sliding sleeve 32 and the rotating shaft 28, the friction block 36 frictionally abuts the rotating shaft 28 under the elastic push of the push spring 39, achieving real-time positioning of the storage slot 8 after the position is switched, effectively improving the stability of the packaging bag 7 during the conveying process.

[0038] Example 2

[0039] See also Figure 1-11 On the basis of Example 1, in addition, the sliding bag-moving assembly of the present device includes a bag-moving plate 20 slidably mounted on a connecting block 23, a wedge block I19 is fixed to one side of the bag-moving plate 20, a push plate 6 that abuts against the wedge block I19 is fixed to the radial slider 5, a wedge block II24 is fixed to the other side of the bag-moving plate 20, a reset plate 17 that abuts against the wedge block II24 is fixed to the supporting platform 3, and a limiting assembly for limiting the position of the bag-moving plate 20 is installed on the connecting block 23.

[0040] The servo motor 14 is capable of driving the threaded rod 13 to rotate alternately forward and reverse. At this time, the translation frame 18 reciprocates linearly. When the translation frame 18 moves toward the steering wheel 4, the wedge block I19 pushes the push plate 6 fixed on the radial slider 5. At this time, the wedge block I19 drives the bag-moving plate 20 to slide. The bag-moving plate 20 corresponds linearly to the packaging bag 7. When the translation frame 18 moves toward the guide tube 15, the wedge block II24 pushes the reset plate 17 to reset the bag-moving plate 20. This is repeated to automatically transport the packaging bag 7 on the storage slot 8 to the bottom of the extension frame 16. With the help of the electric suction cup 27, the packaging bag 7 is pulled to open.

[0041] The limiting assembly includes a push post 25 slidably mounted on the connecting block 23. One end of the push post 25 frictionally abuts against the bag-moving plate 20. The other end of the push post 25 is fixed to a top plate 21. A vertical spring 22 is fixed between the top plate 21 and the connecting block 23. The push post 25 frictionally abuts against the bag-moving plate 20, stabilizing the position of the packaging bag 7 when the bag-moving plate 20 moves the packaging bag 7, thereby ensuring smooth transportation of the packaging bag 7.

[0042] The spacing adjustment assembly of this device includes a central gear 45 rotatably mounted on the extension frame 16. Spur racks 42 are meshed on both sides of the central gear 45. A sliding frame 43 is fixedly connected between the spur rack 42 and the electric suction cup 27. The sliding frame 43 is slidably connected to the extension frame 16. The spacing adjustment assembly also includes a sliding rack 48 fixed to the translation frame 18. A transmission gear 40 is rotatably mounted on the vertical plate 12 and meshes with the sliding rack 48. A pulley mechanism II41 is in transmission connection between the transmission gear 40 and the central gear 45.

[0043] When the translation frame 18 moves toward the steering wheel 4, the sliding rack 48 drives the transmission gear 40 to rotate, and the transmission gear 40 drives the center gear 45 to rotate through the pulley mechanism II41. The center gear 45 drives the two spur racks 42 to move in opposite directions, and the sliding frame 43 drives the electric suction cup 27 to slide, so that the two electric suction cups 27 adsorb the side walls of the packaging bag 7 and pull them, so that the opening of the packaging bag 7 is opened. In this process, the translation frame 18 drives the material guide tube 15 to extend from the opening of the packaging bag 7 to the inside of the packaging bag 7, so that the packaging bag 7 can package the cement.

[0044] Furthermore, a drop hole 9 is formed on the support platform 3, vertically corresponding to the extension frame 16. A support plate 46 is mounted below the drop hole 9. A deflection shaft 47, rotatably mounted on the support platform 3, is fixed to one side of the support plate 46. A worm gear 44 is coaxially fixed to the deflection shaft 47, which is meshed with a worm 26. The worm 26 drives the worm gear 44 to rotate, which in turn drives the deflection shaft 47. This deflection shaft 47 then causes the support plate 46 to deflect, freeing the support plate 46 from blocking the drop hole 9. The cement bags 7 can then fall from the drop hole 9. A conveying device can be provided on the base plate 1 to transport the cement bags 7 to the next production station for further processing.

[0045] In summary, the present invention can drive the steering wheel 4 to rotate step by step through the step-by-step rotation drive assembly, so that the packaging bag 7 on the storage slot 8 rotates step by step, and the radial sliding drive assembly can extend the packaging bag 7 toward the side of the guide tube 15, so that multiple packaging bags 7 can be switched one by one at the workstation, and the packaging bag 7 can achieve automatic conveying effect, which greatly improves the efficiency of the cement bagging operation. The sliding bag assembly provided in the present invention can move the packaging bags 7 on the storage slot 8 one by one between the two electric suction cups 27. In the process of sliding the translation frame 18 toward the guide tube 15, the spacing adjustment assembly is driven, so that the two electric suction cups 27 adsorb the side walls of the packaging bag 7 and move away from each other, so as to pull the packaging bag 7 sideways, so that the opening of the packaging bag 7 is opened, and the guide tube 15 extends to the interior of the packaging bag 7 to significantly improve the accuracy and efficiency of the cement packaging operation.

[0046] It should be noted that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The above embodiments only express the preferred implementation methods of this technical solution. The description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention of this technical solution. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations, improvements and substitutions can be made, which all fall within the scope of protection of this technical solution. The scope of protection of the invention of this technical solution shall be based on the attached claims.

Claims

1. A conveying bagging machine for cement production, comprising a base plate (1), a support frame (2) and a bearing platform (3) fixed on the base plate (1), a vertical plate (12) fixed on the bearing platform (3), a vertically arranged rotating shaft (28) rotatably mounted on the support frame (2), characterized in that: A steering wheel (4) is coaxially fixed on the rotating shaft (28), and a plurality of radial sliders (5) uniformly distributed in an annular direction are slidably mounted on the steering wheel (4). A radial spring (34) is fixed between the radial slider (5) and the steering wheel (4). A receiving groove (8) is fixed on each of the radial sliders (5), and a packaging bag (7) is vertically placed in the receiving groove (8). A stepping rotation drive assembly is mounted on the bottom plate (1), and the stepping rotation drive assembly is used to drive the rotating shaft (28) to rotate step by step. A vertical sliding sleeve (32) is vertically slidably mounted on the rotating shaft (28), and a radial sliding drive assembly is mounted on the vertical sliding sleeve (32), and the radial sliding drive assembly is used to drive the radial slider (5) linear reciprocating motion, a servo motor (14) is fixed on the vertical plate (12), a threaded rod (13) threadedly connected to the translation frame (18) is coaxially fixed to the output shaft of the servo motor (14), a connecting block (23) is fixed on the translation frame (18), an extension frame (16) is fixed on the vertical plate (12), a pair of electric suction cups (27) for adsorbing the side walls of the packaging bag (7) are installed on the extension frame (16), a spacing adjustment component for driving the two electric suction cups (27) to move toward or away from each other is installed on the extension frame (16), a sliding bag assembly for moving the packaging bag (7) toward the extension frame (16) is installed on the connecting block (23), and the translation frame (1 8) A guide tube (15) is fixed at one end away from the connecting block (23), and the guide tube (15) is horizontally opposite to the opening of the packaging bag (7). The stepping rotation drive assembly includes a drive motor (33) fixed on the base plate (1), and the radial sliding drive assembly includes a rotating wheel (10) rotatably mounted on the base plate (1). The rotating wheel (10) is connected to the output shaft of the drive motor (33) through a pulley mechanism I (29). A connecting rod (35) is eccentrically hinged on the rotating wheel (10), and the upper end of the connecting rod (35) is hinged on the vertical sliding sleeve (32). A transmission wedge (37) is fixed on the bottom of the radial slider (5), and a connecting rod (37) is fixed on the vertical sliding sleeve (32) to abut against the transmission wedge (37). The vertical push frame (11) is connected, the sliding bag-moving assembly includes a bag-moving plate (20) slidably mounted on the connecting block (23), a wedge block I (19) is fixed on one side of the bag-moving plate (20), a push plate (6) adapted to abut against the wedge block I (19) is fixed on the radial slider (5), a wedge block II (24) is fixed on the other side of the bag-moving plate (20), a reset plate (17) adapted to abut against the wedge block II (24) is fixed on the bearing platform (3), a limiting assembly for limiting the position of the bag-moving plate (20) is installed on the connecting block (23), a drop hole (9) vertically corresponding to the extension frame (16) is opened on the bearing platform (3), and a support plate (46) is installed below the drop hole (9).A deflection shaft (47) rotatably mounted on the support platform (3) is fixed to one side of the support plate (46), a worm wheel (44) is coaxially fixed to the deflection shaft (47), and a worm (26) is meshingly connected to the worm wheel (44).

2. A cement production conveying bagging machine according to claim 1, characterized in that: An incomplete bevel gear (30) is coaxially fixed to the output shaft of the driving motor (33), and a driven bevel gear (31) intermittently meshing with the incomplete bevel gear (30) is fixedly sleeved on the rotating shaft (28).

3. A cement production conveying bagging machine according to claim 2, characterized in that: A friction block (36) is slidably mounted on the side wall of the vertical sliding sleeve (32), and the friction block (36) is in frictional contact with the rotating shaft (28). An extension plate (38) is fixed on the friction block (36), and a push spring (39) is fixed between the extension plate (38) and the vertical sliding sleeve (32).

4. A cement production conveying bagging machine according to claim 1, characterized in that: The limiting assembly includes a push column (25) slidably mounted on the connecting block (23), one end of the push column (25) is in frictional contact with the bag-moving plate (20), and the other end of the push column (25) is fixed with a top plate (21), and a vertical spring (22) is fixed between the top plate (21) and the connecting block (23).

5. The cement production conveying bagging machine according to claim 1, characterized in that: The spacing adjustment assembly includes a central gear (45) rotatably mounted on the extension frame (16), spur racks (42) are meshedly connected on both sides of the central gear (45), a sliding frame (43) is fixedly connected between the spur rack (42) and the electric suction cup (27), and the sliding frame (43) is slidably connected to the extension frame (16).

6. A cement production conveying bagging machine according to claim 5, characterized in that: The spacing adjustment assembly further includes a sliding rack (48) fixed on the translation frame (18), a transmission gear (40) meshing with the sliding rack (48) is rotatably mounted on the vertical plate (12), and a pulley mechanism II (41) is connected between the transmission gear (40) and the central gear (45).

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