A hoist with a function of quickly unblocking a blockage

Abstract

This invention discloses a hoist with a rapid unblocking function, comprising a feeding structure, a shaking structure, a carrying component, a toggle structure, and a lifting unit. The shaking structure is fixedly mounted on the feeding structure, the carrying component is detachably mounted under the feeding structure, the toggle structure is detachably mounted inside the feeding structure, and the lifting unit is detachably connected to the feeding structure and located on the right side. This invention relates to the field of hoist technology. The feeding structure can quickly assist the flow of materials, improving conveying efficiency; it can also assist in unblocking blockages; the drive of one or two feeding components can be adjusted according to the conveyed particles or powder, and corresponding first or second toggle frames can be installed to promote anti-blocking and rapid unblocking of the discharge port; the overall structure is simple, low-cost, and easy to install and use; it improves conveying efficiency and prevents and unblocks blockages.

Description

Technical Field

[0001] This invention relates to the field of hoisting technology, specifically to a hoisting machine with a function for quickly clearing blockages. Background Technology

[0002] There are many types of grain products, but they can be divided into two main categories: granular and powdered. Before or after processing, conveying equipment is used to feed the grains into the corresponding processing equipment or for bagging. Bucket elevators are the most widely used type of conveying equipment. Currently, bucket elevators are fixed mechanical conveying devices, mainly suitable for the continuous vertical lifting of powdered and granular materials.

[0003] Bucket elevators transport materials concentrated in buckets by gravity, allowing them to fall and flow out through discharge troughs. This, combined with a moving feed box, enables continuous conveying and lifting. However, the different particle sizes and powdery nature of the materials being transported, along with the amount of material in the buckets, all affect the discharge speed. In particular, excessive material in the buckets can easily cause blockages at the discharge port. Therefore, it is necessary to design an elevator specifically for producing grains to overcome these problems. Summary of the Invention

[0004] The purpose of this invention is to provide a hoist with a rapid unblocking function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hoist with a rapid unblocking function, comprising a feeding structure, a shaking structure, a bearing component, a tossing structure, and a hoisting unit;

[0006] The shaking structure is fixedly installed on the feeding structure, the bearing component is detachably installed under the feeding structure, the toggle structure is detachably installed inside the feeding structure, and the lifting unit is detachably connected to the feeding structure and located on the right side; the lifting unit is composed of a lifting belt between lifting frames and driven by a first motor, and several foldable material boxes are equidistantly arranged on the lifting belt, and a base is provided at the bottom of the lifting unit.

[0007] Preferably, the feeding structure includes a material box, two pairs of side plates, a pair of rubber plugs, a discharge chute, and a pair of feeding components;

[0008] The material box has a structure of a box without an upper wall, and installation openings are provided near the middle of the front and rear side walls. The middle of the lower wall inside the material box is provided with a discharge port. First installation holes are provided on the center lines near the bottoms of the left and right side walls of the material box, and second installation holes are provided above the front and rear sides of the first installation holes. The two pairs of side plates are both right-angled trapezoid structures. The two pairs of side plates are respectively fixedly welded to the upper ends of the front and rear side walls of the material box and are symmetrically located on the left and right sides. A pair of rubber plugs are detachably inserted into the first installation holes. One end of the discharge chute is a rectangular box structure, and the other end is a guide chute inclined to the right. One end of the discharge chute is detachably arranged on the lower wall of the material box and is located in the middle. A pair of blanking components are symmetrically arranged between the side plates respectively.

[0009] Preferably, the blanking component includes a pair of first shaft rods, a pair of belt rollers, a conveyor belt and a servo motor;

[0010] The two ends of the pair of first shaft rods are respectively movably inserted between the side plates and between one pair of second installation holes. The pair of belt rollers are respectively fixedly sleeved on the first shaft rods and are inclined and opposite to each other inside the material box and between the side plates. The belt rollers are located above the front side of the discharge port inside the material box. The conveyor belt is respectively movably sleeved on the belt rollers and is inclined inside the material box. The servo motor is fixedly arranged on the right side wall of the material box, and the driving end is fixedly connected to one end of one of the first shaft rods.

[0011] Preferably, the shaking structure is composed of a pair of shaking components, and the shaking components are respectively fixedly arranged between the side plates and are respectively inclined inside the conveyor belt;

[0012] The shaking component includes a folding frame, a plurality of wheel frames, a plurality of rollers, a pushing frame and a pair of first electric push rods;

[0013] The folding frame has a structure of a Chinese character 'Ri', and three flipping grooves are equidistantly arranged on the side wall. Fixed blocks are arranged on the left and right side walls near one end of the folding frame. The folding frame is obliquely and fixedly arranged between one pair of side plates and is connected to the side plates through the fixed blocks. The folding frame is obliquely located inside the conveyor belt. The middle parts of the plurality of wheel frames are respectively movably inserted into the flipping grooves equidistantly through the first pin shafts. Moving grooves are respectively arranged in the middle of the other ends of the plurality of wheel frames. The plurality of rollers are respectively movably arranged inside one end of the wheel frames. The pushing frame has a structure of a Chinese character 'Ri' and is shorter than the folding frame. A plurality of connecting claws corresponding to the wheel frames respectively are equidistantly arranged on the upper wall of the pushing frame. The pushing frame is movably arranged below the folding frame, and the connecting claws are respectively movably inserted into the flipping grooves and are respectively movably connected to the moving grooves through the second pin shafts. One ends of the pair of first electric push rods are respectively fixedly arranged on the upper wall inside one end of the flipping frame and are symmetrically located on the left and right sides of the center line. The telescopic ends of the first electric push rods are respectively fixedly connected to one end of the pushing frame.

[0014] Preferably, the bearing assembly includes a bearing frame and an adapter; wherein the bearing frame has a concave structure, the upper wall of the bearing frame is detachably mounted on the lower wall of the material box and is movably fitted on the outside of the discharge chute, one end of the adapter is fixedly connected to the right side wall of the bottom end of the bearing frame, and the other end is detachably connected to the base of the lifting unit.

[0015] Preferably, the actuating structure includes a force-applying rod, a pair of nuts, a first gear, a second gear, a first actuating frame, and a second actuating frame;

[0016] The force-applying rod has a cross-shaped structure, with the diameters at both ends smaller than those at the middle. The outer walls at both ends of the force-applying rod are provided with oblique threads. The upper and lower side walls at the middle of the force-applying rod are provided with force-applying grooves. A pair of nuts are detachably screwed onto both ends of the force-applying rod. The first gear is fixedly mounted on one end of the force-applying rod, and the second gear is fixedly mounted on one of the servo motor drive ends. The first actuating frame has a tubular structure in the middle, with three actuating plates evenly spaced on its outer walls. The first actuating frame is detachably mounted on the force-applying rod. The second actuating frame has a tubular structure in the middle, with three rows of actuating rods evenly spaced on its outer walls. The second actuating frame is detachably mounted on the force-applying rod.

[0017] Preferably, the first actuating frame is detachably mounted above the discharge port of the material box, and the two ends of the force-applying rod respectively move through the first mounting hole and are fixed by the first nut.

[0018] Preferably, the first gear can mesh with the second gear.

[0019] The present invention proposes a hoist with a rapid unblocking function for material blockages, which has the following advantages:

[0020] 1. This invention can quickly facilitate the flow of materials and improve conveying efficiency through its feeding structure; it can also assist in clearing blockages when materials are blocked.

[0021] 2. The present invention can adjust the driving of one or two feeding components according to the conveyed particles or powder, and install corresponding first or second actuating frame to promote the prevention and rapid unblocking of the discharge port;

[0022] 3. This invention has a simple overall structure, low cost, and is easy to install and use; it improves conveying efficiency and prevents and clears blockages. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the assembly structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the first assembly structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the second assembly structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the third assembly structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the disassembled material feeding structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the disassembled jitter structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the disassembled structure of the load-bearing component of the present invention;

[0030] Figure 8 This is a schematic diagram of the disassembled structure of the toggle mechanism of the present invention;

[0031] Figure 9 This is a schematic diagram of the lifting unit structure of the present invention;

[0032] Figure 10 This is a partially enlarged structural diagram of point A in the present invention;

[0033] Figure 11 This is a partially enlarged structural diagram of point B in the present invention;

[0034] Figure 12 This is a partially enlarged structural diagram at point C of the present invention;

[0035] Figure 13 This is a partially enlarged structural diagram at point D of the present invention;

[0036] Figure 14 This is a partially enlarged structural diagram of point E in the present invention.

[0037] In the diagram: 1. Feeding structure, 11. Material box, 12. Side plate, 13. Rubber plug, 14. Discharge chute, 15. Feeding assembly, 151. First shaft, 152. Roller, 153. Conveyor belt, 154. Servo motor, 2. Vibration structure, 21. Folding frame, 22. Wheel frame, 23. Roller, 24. Push frame, 25. First electric push rod, 3. Bearing assembly, 31. Bearing frame, 32. Adapter seat, 4. Actuating structure, 41. Force rod, 42. Nut, 43. First gear, 44. Second gear, 45. First actuating frame, 46. Second actuating frame, 5. Lifting unit. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figure 1-14 The present invention provides a technical solution: a hoist with a rapid unblocking function, comprising a feeding structure 1, a shaking structure 2, a bearing component 3, a tossing structure 4, and a lifting unit 5;

[0040] The shaking structure 2 is fixedly installed on the feeding structure 1, the bearing component 3 is detachably installed under the feeding structure 1, the toggle structure 4 is detachably installed inside the feeding structure 1, and the lifting unit 5 is detachably connected to the feeding structure 1 and located on the right side. The lifting unit 5 is composed of a lifting belt between the lifting frames and is driven by the first motor. Several foldable material boxes are equidistantly arranged on the lifting belt, and a base is provided at the bottom of the lifting unit 5.

[0041] The following are the model numbers and functions of the electrical components in this case:

[0042] Lifting unit: This is existing technology and can be used with any lifting equipment suitable for this solution. It is composed of multiple boxes that can be moved back and forth by a first motor and can be folded.

[0043] Servo motor: This is existing technology, and any servo motor suitable for this solution can be used.

[0044] Electric linear actuator: This is existing technology, and any electric linear actuator suitable for this solution can be used.

[0045] As a preferred embodiment, the feeding structure 1 further includes a material box 11, two pairs of side plates 12, a pair of rubber plugs 13, a discharge chute 14, and a pair of feeding components 15;

[0046] The material box 11 has a box structure without an upper wall, and the front and rear side walls are provided with installation ports near the middle. The material box 11 has a discharge port in the middle of the lower inner wall. The left and right side walls of the material box 11 are provided with first installation holes near the bottom center line. The first installation holes are provided with second installation holes on the front and rear sides and above. The two pairs of side plates 12 are both right-angled trapezoidal structures. The two pairs of side plates 12 are fixedly welded to the top of the front and rear side walls of the material box 11 and are symmetrically located on the left and right sides. A pair of rubber plugs 13 can be detachably inserted into the first installation holes. One end of the discharge trough 14 is a rectangular box structure, and the other end is a guide trough that tilts to the right. One end of the discharge trough 14 can be detachably placed on the lower wall of the material box 11 and is located in the middle. A pair of feeding components 15 are symmetrically arranged between the side plates 12.

[0047] As a preferred solution, furthermore, the blanking component 15 includes a pair of first shaft rods 151, a pair of belt rollers 152, a conveyor belt 153, and a servo motor 154;

[0048] Both ends of the pair of first shaft rods 151 are respectively movably inserted between the side plates 12 and between one pair of second mounting holes. The pair of belt rollers 152 are respectively fixedly sleeved on the first shaft rods 151, and are respectively located inside the material box 11 and between the side plates 12 and are inclined relative to each other. The belt roller 152 is located above the front side of the discharge port inside the material box 11. The conveyor belt 153 is respectively movably sleeved on the belt rollers 152 and is inclined and located inside the material box 11. The servo motor 154 is fixedly arranged on the right side wall of the material box 11, and the driving end is fixedly connected to one end of one of the first shaft rods 151.

[0049] As a preferred solution, furthermore, the shaking structure 2 is composed of a pair of shaking components, and the shaking components are respectively fixedly arranged between the side plates 12 and are respectively inclined and located inside the conveyor belt 153;

[0050] The shaking component includes a folding frame 21, a plurality of wheel frames 22, a plurality of rollers 23, a pushing frame 24, and a pair of first electric push rods 25;

[0051] The folding frame 21 is in a structure of a Chinese character 'Ri', and three flipping slots are equidistantly arranged on the side wall. Fixed blocks are arranged on the left and right side walls near one end of the folding frame 21. The folding frame 21 is inclined and fixedly arranged between one pair of side plates 12 and is connected to the side plates 12 through the fixed blocks. The folding frame 21 is inclined and located inside the conveyor belt 153. The middle parts of a plurality of wheel frames 22 are respectively movably inserted into the flipping slots through first pin shafts at equal intervals. Moving slots are respectively opened in the middle parts of the other ends of the plurality of wheel frames 22. A plurality of rollers 23 are respectively movably arranged inside one end of the wheel frames 22. The pushing frame 24 is in a structure of a Chinese character 'Ri', and its length is less than that of the folding frame 21. A plurality of connecting claws corresponding to the wheel frames 22 are equidistantly arranged on the upper wall of the pushing frame 24. The pushing frame 24 is movably arranged below the folding frame 21, and the connecting claws are respectively movably inserted into the flipping slots and are respectively movably extended out of the moving slots through second pin shafts and are connected. One ends of the pair of first electric push rods 25 are respectively fixedly arranged on the upper inner wall of one end of the flipping frame and are symmetrically located on the left and right sides of the center case. The telescopic ends of the first electric push rods 25 are respectively fixedly connected to one end of the pushing frame 24.

[0052] As a preferred solution, furthermore, the bearing component 3 includes a bearing frame 31 and a转接座 32; the bearing frame 31 is in a concave structure. The upper wall of the bearing frame 31 is detachably arranged on the lower wall of the material box 11 and is movably sleeved outside the discharge chute 14. One end of the转接座 32 is fixedly connected to the right side wall at the bottom end of the bearing frame 31, and the other end is detachably connected to the base of the lifting unit 5.

[0053] As a preferred embodiment, the actuating structure 4 further includes a force-applying rod 41, a pair of nuts 42, a first gear 43, a second gear 44, a first actuating frame 45, and a second actuating frame 46.

[0054] The force-applying rod 41 has a cross-shaped structure, with the diameters at both ends smaller than those at the middle. The outer walls at both ends of the force-applying rod 41 are provided with oblique threads. The upper and lower side walls at the middle of the force-applying rod 41 are provided with force-applying grooves. A pair of nuts 42 are detachably screwed onto both ends of the force-applying rod 41. The first gear 43 is fixedly mounted on one end of the force-applying rod 41, and the second gear 44 is fixedly mounted on the drive end of one of the servo motors 154. The first actuating frame 45 has a tubular structure in the middle, with three actuating plates equidistantly arranged on its outer walls. The first actuating frame 45 is detachably mounted on the force-applying rod 41. The second actuating frame 46 has a tubular structure in the middle, with three rows of actuating rods equidistantly arranged on its outer walls. The second actuating frame 46 is detachably mounted on the force-applying rod 41.

[0055] As a preferred option, the first actuating frame 45 is detachably mounted above the discharge port of the material box 11, and the two ends of the force rod 41 are respectively movably inserted through the first mounting hole and are limited by the first nut 42 for design, installation and use requirements.

[0056] As a preferred embodiment, the first gear 43 can mesh with the second gear 44 to drive the force-applying rod 41 to rotate.

[0057] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0058] Example: According to the appendix of the instruction manual Figure 1-14 As can be seen, firstly, the material is put into the hopper 11 in the feeding structure 1 and piled up between the conveyor belts 153 in the two sets of feeding components 15; it can flow autonomously by its own weight and with the help of the inclined slope of the conveyor belt 153, and be discharged by the discharge chute 14 in the bearing frame 31 in the bearing component 3, and fall onto the lifting unit 5 which is connected to the connecting seat and rotates in sequence for lifting and use;

[0059] When a large amount of material is put into the hopper 11, it is easy to cause blockage at the discharge port. At this time, the material is stationary without external force. Therefore, one of the servo motors 154 can be driven to rotate, and a roller 152 on one side can be driven to rotate through the first shaft 151, thereby driving the conveyor belt 153 to rotate between the side plates 12, so that the material moves downward to promote discharge; thus achieving the functions of unblocking and fast material discharge.

[0060] When the material is in powder form and a large amount is added, the powder will accumulate and may form lumps, which will adhere to the conveyor belt 153. At this time, the two sets of feeding components 15 can be driven to rotate relative to each other to assist feeding and prevent blockage. At the same time, the first electric push rod 25 in the shaking structure 2 is driven to reciprocate, which drives the push frame 24 connected by multiple wheel frames 22 to move downward in the folding frame 21 in the conveyor belt 153. This causes the roller 23 to be pushed upward and retracted through the folding support of the wheel frame 22, thus knocking the conveyor belt 153 and promoting the descent of the adhered material. It is also suitable for the discharge and anti-blocking of granular materials.

[0061] Finally, when conveying granular grains, the second actuating frame 46 in the actuating structure 4 can be installed in the middle of the discharge port with the help of the force bar 41, and after being limited by the nut 42, the second gear 44 on the servo motor 154 and the first gear 43 on the force bar 41 can mesh with each other; thus, while driving the servo motor 154, it can also drive the force bar 41 to rotate, and drive the second actuating frame 46 to rotate, so that the material descending from the conveyor belt 153 can be quickly discharged from the discharge port, which can also prevent the discharge port from being blocked and accelerate the discharge of material, and the granular grains can also pass through the actuating rods to be discharged; if it is powdered grain, the first actuating frame 45 can be replaced to accelerate the discharge of powder.

[0062] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hoist with a rapid unblocking function, characterized in that: It includes a feeding structure (1), a shaking structure (2), a bearing component (3), a tossing structure (4), and a lifting unit (5); The shaking structure (2) is fixedly installed on the feeding structure (1), the bearing component (3) is detachably installed under the feeding structure (1), the toggle structure (4) is detachably installed inside the feeding structure (1), and the lifting unit (5) is detachably connected to the feeding structure (1) and located on the right side; the lifting unit (5) is composed of a lifting belt between the lifting frames and is driven by a first motor, and several foldable material boxes are equidistantly arranged on the lifting belt, and a base is provided at the bottom of the lifting unit (5); The feeding structure (1) includes a material box (11), two pairs of side plates (12), a pair of rubber plugs (13), a discharge chute (14), and a pair of feeding components (15); The material box (11) is a box structure without an upper wall, and the front and rear side walls are provided with installation ports near the middle. The material box (11) has a discharge port in the middle of the lower inner wall. The material box (11) has a first installation hole near the bottom center line on the left and right side walls. The first installation hole has a second installation hole on the front and rear sides and above. The two pairs of side plates (12) are right-angled trapezoidal structures. The two pairs of side plates (12) are fixedly welded to the top of the front and rear side walls of the material box (11) respectively, and are symmetrically located on the left and right sides respectively. A pair of rubber plugs (13) can be detachably inserted into the first installation hole. One end of the discharge groove (14) is a rectangular box structure, and the other end is a guide groove inclined to the right. One end of the discharge groove (14) can be detachably placed on the lower wall of the material box (11) and is located in the middle. A pair of feeding components (15) are symmetrically arranged between the side plates (12). The shaking structure (2) consists of a pair of shaking components, wherein the shaking components are fixedly disposed between the side plates (12) and are respectively inclined within the conveyor belt (153); The shaking assembly includes a folding frame (21), a plurality of wheel frames (22), a plurality of rollers (23), a push frame (24), and a pair of first electric push rods (25); The folding frame (21) is in a shape of a Chinese character "Ri" (a rectangle with a horizontal bar in the middle), and three flipping slots are equidistantly arranged on the side walls. On the left and right side walls near one end of the folding frame (21), fixing blocks are provided. The folding frame (21) is inclined and fixedly arranged between one pair of side plates (12), and is connected to the side plates (12) through the fixing blocks. The folding frame (21) is inclined and located inside the conveyor belt (153). The middle parts of several wheel frames (22) are respectively movably and equidistantly installed in the flipping slots through the first pin shafts. Moving slots are respectively arranged in the middle of the other ends of several wheel frames (22). Several rollers (23) are respectively movably arranged inside one end of the wheel frames (22). The pushing frame (24) is in a shape of a Chinese character "Ri" (a rectangle with a horizontal bar in the middle), and its length is less than that of the folding frame (21). Several connecting claws corresponding to the wheel frames (22) are equidistantly arranged on the upper wall of the pushing frame (24). The pushing frame (24) is movably arranged below the folding frame (21), and the connecting claws are respectively movably inserted into the flipping slots and are respectively movably connected to the moving slots through the second pin shafts. One ends of a pair of first electric push rods (25) are respectively fixedly arranged on the inner upper wall at one end of the flipping frame, and are symmetrically located on the left and right sides of the center line. The telescopic ends of the first electric push rods (25) are respectively fixedly connected to one end of the pushing frame (24).

2. The hoist with rapid unblocking function according to claim 1, characterized in that: The blanking component (15) includes a pair of first shaft rods (151), a pair of belt rollers (152), a conveyor belt (153) and a servo motor (154); Both ends of a pair of first shaft rods (151) are respectively movably installed between the side plates (12) and between one pair of second mounting holes. A pair of belt rollers (152) are respectively fixedly sleeved on the first shaft rods (151), and are respectively inclined and opposite inside the material box (11) and between the side plates (12). The belt rollers (152) are located above the front side of the discharge port inside the material box (11). The conveyor belt (153) is respectively movably sleeved on the belt rollers (152) and is inclined and located inside the material box (11). The servo motor (154) is fixedly arranged on the right side wall of the material box (11), and the driving end is fixedly connected to one end of one of the first shaft rods (151).

3. The hoist with rapid unblocking function according to claim 2, characterized in that: The bearing component (3) includes a bearing frame (31) and a转接座 (32); among which the bearing frame (31) is in a concave structure. The upper wall of the bearing frame (31) is detachably installed on the lower wall of the material box (11) and is movably sleeved outside the discharge slot (14). One end of the转接座 (32) is fixedly connected to the right side wall at the bottom end of the bearing frame (31), and the other end is detachably connected to the base of the lifting unit (5).

4. The hoist with rapid unblocking function according to claim 3, characterized in that: The拨动结构 (4) includes a force - applying rod (41), a pair of nuts (42), a first gear (43), a second gear (44), a first拨动架 (45) and a second拨动架 (46); The force-applying rod (41) has a cross-shaped structure, and the diameters at both ends are smaller than those at the middle. The outer walls at both ends of the force-applying rod (41) are provided with oblique threads. The upper and lower side walls at the middle of the force-applying rod (41) are provided with force-applying grooves. A pair of nuts (42) are detachably screwed onto both ends of the force-applying rod (41). The first gear (43) is fixedly mounted on one end of the force-applying rod (41). The second gear (44) is fixedly mounted on the drive end of one of the servo motors (154). The middle part of the first actuating frame (45) is a tubular structure, and three actuating plates are equidistantly arranged on the outer wall. The first actuating frame (45) is detachably mounted on the force-applying rod (41). The middle part of the second actuating frame (46) is a tubular structure, and three rows of actuating rods are equidistantly arranged on the outer wall. The second actuating frame (46) is detachably mounted on the force-applying rod (41).

5. A hoist with rapid unblocking function according to claim 4, characterized in that: The first actuating frame (45) is detachably mounted above the discharge port of the material box (11), and the two ends of the force rod (41) are respectively movably inserted through the first mounting hole and are limited by the first nut (42).

6. A hoist with rapid unblocking function according to claim 5, characterized in that: The first gear (43) can mesh with the second gear (44).

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