Steel structure building truss hoisting auxiliary device

Abstract

The invention discloses a steel structure building truss hoisting auxiliary device, and belongs to the technical field of building hoisting equipment, the steel structure building truss hoisting auxiliary device comprises a mounting seat, suspension arms and a hoisting arm, two parallel rotating shafts are rotatably arranged in the mounting seat, each rotating shaft is provided with one suspension arm, one end of each suspension arm is fixedly sleeved on the corresponding rotating shaft, and the other end of each suspension arm is fixedly sleeved on the hoisting arm. A lifting arm is rotatably arranged above the mounting base, a rotating shaft of the lifting arm is perpendicular to the axis of the rotating shaft, a supporting shaft is arranged at the end, away from the rotating shaft, of the lifting arm and is parallel to the rotating shaft, and a limiting baffle is arranged at the end, away from the lifting arm, of the supporting shaft; the rotation limiting mechanism is used for limiting rotation of the rotating shaft. The problem that in the prior art, mounting and dismounting are inconvenient when a steel wire rope is adopted for lifting is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of building hoisting equipment, and in particular relates to a steel structure building truss hoisting auxiliary device. Background Art

[0002] The installation of the steel roof support truss is to hoist and install the whole structure after the welding and assembly on the ground is completed. In the prior art, the roof building truss is welded and assembled on the sleepers on the ground, and then hoisted by a single-point fixed wire rope or a multi-point fixed wire rope. After hoisting to the designated position, the building truss is first connected and stabilized with the steel column before the wire rope is removed. In this process, the installation and removal of the wire rope are complicated, especially when the wire rope is removed, high-altitude work is required, and in order to have a stable hanging point, a hook must be welded on the truss to achieve the stability of the hanging point. The above process has low construction efficiency and increases the construction safety risk. Based on this, further improvements are needed to the hoisting of the steel roof support truss. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the lifting and installation of steel structure roof support trusses in the prior art, and to propose a steel structure building truss lifting auxiliary device.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a steel structure building truss lifting auxiliary device, including a mounting seat, a suspension arm and a lifting arm, two mutually parallel rotating shafts are rotatably arranged in the mounting seat, each rotating shaft is provided with a suspension arm, one end of the suspension arm is fixedly sleeved on the rotating shaft, a lifting arm is rotatably arranged above the mounting seat, the rotating shaft of the lifting arm is perpendicular to the axis of the rotating shaft, a support shaft is arranged at one end of the suspension arm away from the rotating shaft, the support shaft is parallel to the rotating shaft, a rubber sleeve is rotatably sleeved on the support shaft, a limit baffle is arranged at one end of the support shaft away from the suspension arm, a limited rotation mechanism is arranged in the mounting seat, and the limited rotation mechanism is used to limit the rotation of the rotating shaft.

[0005] As a further description of the above technical solution: a first gear is coaxially fixed on the rotating shaft, and the two first gears on the two rotating shafts are meshed with each other.

[0006] As a further description of the above technical solution: a first return torsion spring is arranged between the rotating shaft and the mounting seat, the first return torsion spring is sleeved on the rotating shaft, the rotating shaft is divided into a first rotating shaft and a second rotating shaft, the rotation limiting mechanism includes a first clutch claw coaxially fixed on the first rotating shaft and a second clutch claw rotatably sleeved on the first rotating shaft, the first clutch claw and the second clutch claw correspond to each other, and also includes a sliding plate, the sliding plate is sleeved on the first rotating shaft and the second rotating shaft, the sliding plate and the second clutch claw are fixedly connected, a clamping spring is sleeved on the second rotating shaft, the clamping spring is located on the side of the sliding plate away from the second clutch claw, the clamping spring is located between the sliding plate and the suspension arm, and also includes a toggle assembly, which is used to drive the sliding plate to move.

[0007] As a further description of the above technical solution: a clearance hole is opened on the mounting seat, and the toggle assembly includes a quarter gear ring fixedly arranged on the lifting arm, the quarter gear ring is coaxial with the rotating shaft of the suspension arm, the quarter gear ring corresponds to the clearance hole, and a sliding rack is arranged in the mounting seat, the sliding rack corresponds to the quarter gear ring, and the sliding rack is connected to the sliding plate.

[0008] As a further description of the above technical solution: an indirect drive plate is sleeved on the second rotating shaft, the indirect drive plate is fixedly connected to the sliding rack, the indirect drive plate is arranged on the side of the sliding plate away from the clamping spring, and an adjustment spring is arranged between the indirect drive plate and the sliding plate.

[0009] As a further description of the above technical solution: a lifting ring is fixedly provided at one end of the lifting arm away from its rotating shaft, and a limited rotation block is provided on the lifting arm.

[0010] As a further description of the above technical solution: an adjusting mechanism is provided on the suspension arm, and the adjusting mechanism is used to adjust the rotation of the limit baffle, and the limit baffle is rotatably arranged on the support shaft, and a connecting shaft is rotatably arranged in the support shaft, and the connecting shaft runs through the support shaft, and an inner ratchet ring is coaxially fixedly arranged on the end of the connecting shaft away from the limit baffle, and a second reset torsion spring is arranged between the inner ratchet ring and the suspension arm, and a first synchronous wheel is rotatably sleeved on the end of the connecting shaft away from the limit baffle, and a pawl ring is coaxially fixedly arranged on the first synchronous wheel, and the pawl ring is adapted to the inner ratchet ring, and a driving rod is coaxially fixedly arranged on the end of the connecting shaft away from the first synchronous wheel, and the driving rod is connected to the limit baffle, and a non-full gear ring is fixedly arranged on the mounting seat, and the non-full gear ring is coaxially arranged with the rotating shaft, and a second gear is rotatably arranged on the suspension arm, and the second gear is meshed with the non-full gear ring, and a second synchronous wheel is coaxially fixedly connected to the second gear, and the second synchronous wheel and the first synchronous wheel are driven by a synchronous belt, and a damping washer is arranged between the connecting shaft and the support.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: (1) When the lifting auxiliary device of the present application is used to lift and install the truss, the device can be installed on the truss conveniently and quickly, and in the process of converting the horizontal truss into a vertical state during lifting, there are two supporting points for the truss, making it safer and more stable. When it is officially suspended in the air, the support axis is located in the angle between the vertical support and the inclined beam, making the lifting point more stably fixed. After the lifting and installation is completed, the device can be removed from the truss without the need for high-altitude operations.

[0012] (2) By setting the adjustment spring and the indirect drive plate, the force of the adjustment spring can be stored during the process of the suspension arm being converted from a horizontal state to a vertical state. When the suspension arm is not subjected to force, the adjustment spring can drive the sliding plate to drive the second clutch claw to move, thereby disengaging the first clutch claw from the second clutch claw, ensuring that during the process of the truss being converted from a horizontal state to a vertical state, the two suspension arms do not rotate relative to the mounting seat, thereby ensuring the stability of the two support points.

[0013] (3) The sizes of the engagement claws of the first clutch claw and the second clutch claw are set inconsistently, ensuring that they can normally engage together only when the lower ends of the two suspension arms are farthest apart. Therefore, after the lifting and installation is completed, the suspension arm can rotate under the action of the first return torsion spring to restore the initial state. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention, which is in an unused state; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention from another angle, in an unused state; Figure 3 A bottom view of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention, which is a diagram showing a state in which the building truss is completely hoisted; Figure 5 It is an exploded view of the connecting shaft, supporting shaft and limit baffle of the adjusting mechanism of the present invention; Figure 6 It is an exploded schematic diagram of the synchronous belt, the first synchronous wheel, the ratchet ring, and the inner ratchet ring of the present invention; Figure 7 An exploded view of the mounting seat and the rotating shaft of the present invention; Figure 8 An exploded view of the first rotating shaft, the first clutch claw, and the second clutch claw of the present invention; Fig. 9 This is the initial state diagram of the first step of the lifting operation of the present invention; Fig.10 This is a state diagram during the second step of the lifting operation of the present invention.

[0015] Legend: 1. Crane; 2. Sleeper; 3. Inclined beam; 4. Vertical support; 5. Mounting seat; 6. Suspension arm; 7. Lifting arm; 8. First gear; 9. Rotating seat; 10. Lifting ring; 11. Limiting block; 12. First reset torsion spring; 13. First rotating shaft; 14. Second rotating shaft; 15. First clutch claw; 16. Second clutch claw; 17. Sliding plate; 18. Compression spring; 19. Clearance hole; 20. Quarter gear ring; 21. Sliding rack; 22. Indirect drive plate; 23. Adjusting spring; 24. Support shaft; 25. Rubber sleeve; 26. Limit baffle; 27. Connecting shaft; 28. Inner ratchet ring; 29. ​​Second reset torsion spring; 30. First synchronous wheel; 31. Ratchet ring; 32. Driving rod; 33. Partial gear ring; 34. Second synchronous wheel; 35. Synchronous belt; 36. Second gear. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-10 The present invention provides a technical solution for a steel structure building truss hoisting auxiliary device: A steel structure building truss lifting auxiliary device for Fig. 9 The triangular steel structure roof support truss shown in the figure is assisted in lifting. The lifting auxiliary device is installed between the two inclined beams 3 and the vertical support 4 of the roof support truss, and includes a mounting seat 5, a suspension arm 6 and a lifting arm 7. The mounting seat 5 is welded from steel plates. Two mutually parallel rotating shafts are arranged inside the mounting seat 5 along the front-back direction. A suspension arm 6 is arranged on each rotating shaft. The upper end of the suspension arm 6 is fixedly sleeved on the rotating shaft. The first gear 8 is coaxially fixed on the two rotating shafts. The two first gears 8 on the two rotating shafts are meshed with each other. When the suspension arm 6 rotates around the rotating shaft under the action of the first gear 8, the lower ends of the two suspension arms 6 approach or move away from each other.

[0018] A lifting arm 7 is rotatably provided above the mounting seat 5, and the rotating shaft of the lifting arm 7 is perpendicular to the axis of the rotating shaft. Specifically, a rotating seat 9 is provided above the mounting seat 5, one end of the lifting arm 7 rotates on the rotating seat 9, and a lifting ring 10 is fixedly provided at the end of the lifting arm 7 away from the rotating seat 9, and the lifting ring 10 is connected to the hook of the crane 1. A limited rotation block 11 is provided on the lifting arm 7. Under the action of the limited rotation block 11, the lifting arm 7 can only rotate within a range of 90 degrees perpendicular to the mounting seat 5 and parallel to the mounting seat 5.

[0019] A limited rotation mechanism is arranged in the mounting seat 5, and the limited rotation mechanism is used to limit the rotation of the rotating shaft and the suspension arm 6. A first return torsion spring 12 is arranged between the rotating shaft and the mounting seat 5. Under the action of the first return torsion spring 12, the lower ends of the two suspension arms 6 are moved away from each other under the gravity of the unsupported truss.

[0020] The rotating shaft is divided into a first rotating shaft 13 and a second rotating shaft 14. The rotation limiting mechanism includes a first clutch claw 15 coaxially fixed on the first rotating shaft 13 and a second clutch claw 16 rotatably sleeved on the first rotating shaft 13. The first clutch claw 15 and the second clutch claw 16 correspond to each other. The first clutch claw 15 and the second clutch claw 16 can only bite with each other when the lower ends of the two suspension arms 6 are far away from each other. Specifically, the bite claws of the first clutch claw 15 and the second clutch claw 16 are inconsistent in size.

[0021] It also includes a sliding plate 17, which is sleeved on the first rotating shaft 13 and the second rotating shaft 14. The sliding plate 17 is fixedly connected to the second clutch claw 16. A clamping spring 18 is sleeved on the second rotating shaft 14. The clamping spring 18 is located on the side of the sliding plate 17 away from the second clutch claw 16. The clamping spring 18 is located between the sliding plate 17 and the suspension arm 6. It also includes a toggle assembly, which is used to drive the sliding plate 17 to move.

[0022] A clearance hole 19 is provided on the mounting seat 5, and the toggle assembly includes a quarter gear ring 20 fixedly arranged on the lifting arm 7, the quarter gear ring 20 is coaxial with the rotating shaft of the suspension arm 6, and the quarter gear ring 20 corresponds to the clearance hole 19. A sliding rack 21 is arranged in the mounting seat 5, and the sliding rack 21 corresponds to the quarter gear ring 20. An indirect driving plate 22 is sleeved on the second rotating shaft 14, and the indirect driving plate 22 is fixedly connected to the sliding rack 21. The indirect driving plate 22 is arranged on the side of the sliding plate 17 away from the clamping spring 18, and an adjusting spring 23 is arranged between the indirect driving plate 22 and the sliding plate 17. When the lifting arm 7 is parallel to the mounting seat 5, under the action of the clamping spring 18, the first clutch claw 15 and the second clutch claw 16 are engaged with each other, and the adjusting spring 23 is in a natural state.

[0023] A support shaft 24 is provided at one end of the suspension arm 6 away from the rotating axis. The support shaft 24 is parallel to the rotating axis and is arranged toward the rear of the mounting seat 5. A rubber sleeve 25 is rotatably sleeved on the support shaft 24. A limit baffle 26 is provided at one end of the support shaft 24 away from the suspension arm 6.

[0024] The suspension arm 6 is provided with an adjustment mechanism, and the adjustment mechanism is used to adjust the rotation of the limit baffle 26. The limit baffle 26 is rotatably arranged on the support shaft 24. A connecting shaft 27 is rotatably arranged inside the support shaft 24. The connecting shaft 27 runs through the support shaft 24. An inner ratchet ring 28 is coaxially fixedly arranged at one end of the connecting shaft 27 away from the limit baffle 26. A second reset torsion spring 29 is arranged between the inner ratchet ring 28 and the suspension arm 6. A first synchronous wheel 30 is rotatably sleeved at one end of the connecting shaft 27 away from the limit baffle 26. A ratchet ring 31 is coaxially fixed on the first synchronous wheel 30. The ratchet ring 31 is adapted to the inner ratchet ring 28. The end of the connecting shaft 27 away from the first synchronous wheel 30 is coaxially fixed. A driving rod 32 is provided, which is connected to the limit baffle 26. A non-full gear ring 33 is fixedly provided on the mounting seat 5, and the non-full gear ring 33 is coaxially arranged with the rotating shaft. A second gear 36 is rotatably provided on the suspension arm 6, and the second gear 36 meshes with the non-full gear ring 33. A second synchronous wheel 34 is coaxially fixedly connected to the second gear 36. The second synchronous wheel 34 and the first synchronous wheel 30 are transmitted through a synchronous belt 35. A damping washer is provided between the connecting shaft 27 and the support. The inner circumference of the synchronous belt 35 is provided with a lack of belt teeth. Specifically, when the lower ends of the suspension arms 6 are far away from each other, the portion of the synchronous belt 35 in contact with the first synchronous wheel 30 is in a state of no belt teeth.

[0025] Working principle: The initial state is as follows Fig. 9 As shown, the supporting truss is horizontally placed on the sleepers 2 on the ground, at this time, the lower ends of the two suspension arms 6 of the lifting auxiliary device are in a state of being away from each other, the lifting arm 7 and the mounting seat 5 are parallel to each other, the lifting auxiliary device is placed horizontally, so that the two suspension arms 6 correspond to the two inclined beams 3 one by one, and then the lifting auxiliary device is translated as a whole, so that the two rubber sleeves 25 contact the inclined beams 3 and the limit baffle 26 is located below the inclined beams 3. In this state, the first clutch claw 15 and the second clutch claw 16 of the rotation limiting mechanism are in a state of mutual engagement, and the indirect drive plate 22 is in a position away from the sliding plate 17.

[0026] Then the hook of the crane 1 is hung on the lifting ring 10, and then the first step of lifting operation is performed, the purpose is to convert the supporting truss from a horizontal state to a vertical state, but not to make it suspended in the air. In this process, the lifting arm 7 rotates relative to the mounting seat 5, and the supporting truss rotates around the sleeper 2. During the rotation of the lifting arm 7, the quarter gear ring 20 drives the sliding rack 21 to move and drives the indirect drive plate 22 to move, so that the adjustment spring 23 is compressed. In this process, since the suspension arm 6 is affected by the gravity of the supporting truss part, there is a relative rotation tendency between the two, so there is a circumferential bite friction between the first clutch claw 15 and the second clutch claw 16, so the first clutch claw 15 and the second clutch claw 16 cannot be separated.

[0027] When the supporting truss rotates to a vertical state, the lifting arm 7 also rotates to a vertical state. At this moment, the adjusting spring 23 is in a maximum compression state. At this time, since the direction of the suspension arm 6 supported by the supporting truss is changed to the axial direction along the supporting shaft 24, there is no circumferential engagement friction between the first clutch claw 15 and the second clutch claw 16. Under the action of the adjusting spring 23, the clamping spring 18 is compressed, and the sliding plate 17 drives the second clutch claw 16 to move, so that the first clutch claw 15 and the second clutch claw 16 are out of the engagement state.

[0028] Then the second lifting operation is carried out, and the support truss is suspended in the air and lifted to the installation position by the lifting of the crane 1. First, during the upward lifting process, the lower ends of the two suspension arms 6 approach each other until the rubber sleeve 25 slides to the angle position between the diagonal beam 3 and the vertical support 4. During this process, the second gear 36 rotates around the non-full gear ring 33, and the second gear 36 rotates at the same time. During this process, the second synchronous wheel 34 drives the first synchronous wheel 30 to rotate through the synchronous belt 35, and the rotation of the first synchronous wheel 30 drives the pawl ring 31 to rotate, but the first pawl ring 31 is not engaged with the inner ratchet ring 28, so the limit baffle 26 remains fixed under the action of the second reset torsion spring 29.

[0029] After the supporting truss is hoisted to the designated position and installed stably, the hoisting auxiliary device is loosened downward by the crane 1. Under the action of the first reset torsion spring 12, the two suspension arms 6 rotate around the rotation axis to the initial state. During this process, the second gear 36 rotates in the opposite direction around the non-full tooth. The second synchronous wheel 34 drives the first synchronous wheel 30 to rotate under the action of the synchronous belt 35. The first synchronous wheel 30 drives the pawl ring 31 to rotate in the opposite direction. The pawl ring 31 drives the inner ratchet ring 28 to rotate, thereby driving the connecting shaft 27 to rotate, so that the driving rod 32 drives the limit baffle 26 to rotate, so that the limit baffle 26 rotates to not be opposite to the suspension arm 6, so that the inclined beam 3 is not located between the two, thereby facilitating the removal of the hoisting auxiliary device.

[0030] It should be noted that when the suspension arms 6 rotate to a state where the lower ends of the two suspension arms 6 are away from each other, the first synchronous wheel 30 contacts the non-toothed position of the synchronous belt 35. At this time, the connecting shaft 27 rotates under the action of the second reset torsion spring 29, and under the action of the damping washer, there is sufficient time for the lifting auxiliary device to detach from the supporting truss.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Within the technical scope disclosed by the present invention, technicians familiar with the technical field can make equivalent replacements or changes based on the technical scheme and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A steel structure building truss hoisting auxiliary device, characterized in that: The invention comprises a mounting seat (5), a suspension arm (6) and a lifting arm (7); two mutually parallel rotating shafts are rotatably arranged in the mounting seat (5); a suspension arm (6) is arranged on each rotating shaft; one end of the suspension arm (6) is fixedly sleeved on the rotating shaft; a lifting arm (7) is rotatably arranged above the mounting seat (5); the rotating shaft of the lifting arm (7) is perpendicular to the axis of the rotating shaft; a support shaft (24) is arranged at one end of the suspension arm (6) away from the rotating shaft; the support shaft (24) is parallel to the rotating shaft; a rubber sleeve (25) is rotatably sleeved on the support shaft (24); a limit stopper (26) is arranged at one end of the support shaft (24) away from the suspension arm (6); a limited rotation mechanism is arranged in the mounting seat (5); the limited rotation mechanism is used to limit the rotation of the rotating shaft.

2. The steel structure building truss hoisting auxiliary device according to claim 1 is characterized in that: A first gear (8) is coaxially fixed on the rotating shaft, and the two first gears (8) on the two rotating shafts are meshed with each other.

3. The steel structure building truss hoisting auxiliary device according to claim 1 is characterized in that: A first return torsion spring (12) is arranged between the rotating shaft and the mounting seat (5), and the first return torsion spring (12) is sleeved on the rotating shaft. The rotating shaft is divided into a first rotating shaft (13) and a second rotating shaft (14). The rotation limiting mechanism comprises a first clutch claw (15) coaxially fixed on the first rotating shaft (13) and a second clutch claw (16) rotatably sleeved on the first rotating shaft (13), the first clutch claw (15) and the second clutch claw (16) corresponding to each other, and further comprises a sliding plate ( 17), the sliding plate (17) is sleeved on the first rotating shaft (13) and the second rotating shaft (14), the sliding plate (17) and the second clutch claw (16) are fixedly connected, the second rotating shaft (14) is sleeved with a clamping spring (18), the clamping spring (18) is located on the side of the sliding plate (17) away from the second clutch claw (16), the clamping spring (18) is located between the sliding plate (17) and the suspension arm (6), and also includes a toggle assembly, which is used to drive the sliding plate (17) to move.

4. The steel structure building truss hoisting auxiliary device according to claim 3 is characterized in that: The mounting seat (5) is provided with a clearance hole (19), the toggle assembly comprises a quarter gear ring (20) fixedly arranged on the lifting arm (7), the quarter gear ring (20) is coaxial with the rotating shaft of the suspension arm (6), the quarter gear ring (20) corresponds to the clearance hole (19), a sliding rack (21) is arranged in the mounting seat (5), the sliding rack (21) corresponds to the quarter gear ring (20), and the sliding rack (21) is connected to the sliding plate (17).

5. The steel structure building truss hoisting auxiliary device according to claim 4 is characterized in that: An indirect drive plate (22) is sleeved on the second rotating shaft (14), the indirect drive plate (22) is fixedly connected to the sliding rack (21), the indirect drive plate (22) is arranged on a side of the sliding plate (17) away from the compression spring (18), and an adjustment spring (23) is arranged between the indirect drive plate (22) and the sliding plate (17).

6. The steel structure building truss hoisting auxiliary device according to claim 1 is characterized in that: A lifting ring (10) is fixedly provided at one end of the lifting arm (7) away from the rotating shaft thereof, and a limited rotation block (11) is provided on the lifting arm (7).

7. The steel structure building truss hoisting auxiliary device according to claim 1 is characterized in that: The suspension arm (6) is provided with an adjustment mechanism, which is used to adjust the rotation of the limit baffle (26). The limit baffle (26) is rotatably arranged on the support shaft (24). A connecting shaft (27) is rotatably arranged inside the support shaft (24). The connecting shaft (27) passes through the support shaft (24). An inner ratchet ring (28) is coaxially fixedly arranged at one end of the connecting shaft (27) away from the limit baffle (26). A second reset torsion spring (29) is arranged between the inner ratchet ring (28) and the suspension arm (6). A first synchronous wheel (30) is rotatably sleeved at one end of the connecting shaft (27) away from the limit baffle (26). A ratchet ring (31) is coaxially fixedly arranged on the first synchronous wheel (30). The ratchet ring (31) is The first synchronous wheel (30) is adapted to the inner ratchet ring (28), a driving rod (32) is coaxially fixedly arranged at one end of the connecting shaft (27) away from the first synchronous wheel (30), and the driving rod (32) is connected to the limit baffle (26). A non-full gear ring (33) is fixedly arranged on the mounting seat (5), and the non-full gear ring (33) is coaxially arranged with the rotating shaft. A second gear (36) is rotatably arranged on the suspension arm (6), and the second gear (36) is meshed with the non-full gear ring (33). A second synchronous wheel (34) is coaxially fixedly connected to the second gear (36), and the second synchronous wheel (34) and the first synchronous wheel (30) are driven by a synchronous belt (35). A damping washer is arranged between the connecting shaft (27) and the support.

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