CN218789935U - Electric cocoon picking machine - Google Patents

Abstract

The utility model provides an electronic cocoon machine, which comprises a frame, a workbench, the direction limit, the separation comb claw, go out the cocoon notch, servo motor, the cluster utensil is dialled and is moved drive arrangement, the workstation is fixed in the frame, two direction limits set up both sides around the workstation, the inboard interval matches with the cluster utensil of camptos between two direction limits, cluster utensil is dialled and is moved drive arrangement and fix in the frame, cluster utensil is dialled and is moved drive arrangement and can drive the cluster utensil of camptos and move along the workstation horizontal migration, the lower extreme equidistant fixing of separation comb claw is on the workstation, it sets up on the workstation and is close to the feeding end one side of the stiff end of separation comb claw to go out the cocoon notch. Silkworm cocoon cluster tool is directly put into the workstation from the feeding end as long as the silkworm raiser passes to separation comb claw one side along table surface, and the silkworm cocoon on the silkworm cocoon cluster tool just can once only be plucked off automatically, directly drops to receive in the cocoon frame, and it is efficient to adopt the cocoon, low in labor strength, and equipment cost is low, easy operation, and the silkworm raiser can all use.

Description

Electric cocoon picking machine

[ technical field ] A

The utility model relates to a silkworm cocoon is adopted long-pending technical field, especially relates to a cocoon harvesting machine.

[ background of the invention ]

In the process of silkworm breeding, silkworm cocoons are all accumulated on a silkworm cocoon cluster tool, the traditional silkworm cocoon cluster tool is a grass cage, the currently commonly used silkworm cocoon cluster tool is a plastic product produced industrially, and the applicant discloses a novel cocooning cluster tool in ZL202010640131.1, as shown in figure 1, the novel cocooning cluster tool comprises a cocoon forming frame and supporting legs, wherein the cocoon forming frame consists of transverse frame bars, longitudinal frame bars and cocoon falling columns, one end of each supporting leg is provided with a supporting shaft, and the supporting shaft and a supporting shaft hole are matched components; the novel cocooning cluster tool is beneficial to improving the spinning rate; the cocoon frame passes through the spike and supports subaerial, has improved the holistic gas permeability of device, and the cocoon post that falls on transverse frame strip and the longitudinal frame strip transversely, vertically separately the interval sets up, and the make full use of space has left sufficient cocoon space under the sufficient condition of the cocoon post number of having guaranteed to fall, has improved into the nest rate, and the cross section of the cocoon post that falls simultaneously is non-circular, can be polygon, star type, is convenient for hang the silk, improves the cocoon rate. The patent successfully optimizes and improves the prior cocooning cluster tool, and creates basic conditions for realizing mechanical cocoon picking in the later period.

The applicant discloses in 202010640350.x "a camptos and cocoons picking composite tufting tool", which comprises a cocoons frame, a cocoons picking frame and supporting legs, wherein the cocoons picking frame comprises transverse frame strips, longitudinal frame strips and cocoons dropping columns, the transverse frame strips and the longitudinal frame strips are arranged in a vertical crossing manner to form a plurality of cuboid cocoon containing grids, the cocoons dropping columns which are vertically distributed at intervals are arranged on the same side of the transverse frame strips and the longitudinal frame strips of each rectangular cocoon containing grid, the cocoons dropping columns on the transverse frame strips and the longitudinal frame strips are arranged in a staggered manner in the transverse direction and the longitudinal direction, the cocoons picking frame is a cocoons picking frame grid body formed by mutually and vertically crossing transverse cocoons clustering strips and longitudinal cocoons clustering strips, the supporting legs are arranged at intervals on one side of the cocoons picking frame which is not provided with the cocoons dropping columns, the cocoons picking frame is sleeved on one side of the cocoons dropping columns arranged on the cocoons picking frame, and the cocoons picking frame is sleeved with the cocoons picking frame, and the cocoons picking frame are required to be sleeved: each cocoon containing grid is internally provided with a transverse tuft strip or a longitudinal tuft strip or both the transverse tuft strip and the longitudinal tuft strip.

According to the patent scheme, cocoons on the cocoon frames are separated from the frames through the cocoon picking frames, the primary manual cocoon picking method is adopted, manual centralized cocoon picking can be achieved, the efficiency is far higher than that of a traditional picking mode, manual picking is adopted, the labor intensity of operators is too high, women and old people generally do not move, and therefore the manual cocoon picking method is difficult to popularize and apply.

In order to realize mechanical cocoon collection, the applicant discloses a silkworm cocoon collection machine in patent No. 202021363219.5, which comprises a side plate frame, a cocoon removing mechanism, a positioning pressing mechanism, a cocoon moving mechanism, a left fixing seat and a right fixing seat, wherein the side plate frame is formed by vertically and fixedly connecting four side plates in a rectangular shape from head to tail, the four corners of the top of the side plate frame are respectively and fixedly connected with the left fixing seat and the right fixing seat, the positioning pressing mechanism comprises a first movable rod, a square groove, a pressing plate, an open groove, a first positioning hook plate, a pin shaft, a first connecting rod, a sleeve rod, an eccentric sleeve, a crank, a second movable rod, a second connecting rod, a second positioning hook plate, a sleeve plate and a third positioning hook plate, the cocoon removing mechanism comprises a supporting plate, a cocoon ejecting column, an ejecting rod, a hinged sleeve, a supporting rod, a connecting frame and a pedal, and the cocoon moving mechanism comprises a guide rod, a guide sleeve, a fixed rod, a mounting plate and a pushing rod.

Although mechanical cocoon collection is realized, the whole cocoon collection machine is complex in structure and complicated in operation, the positioning and pressing mechanism is firstly utilized to stably press and fix the cocoon cluster tool, then the cocoon on the cocoon forming column is ejected from the cluster tool through the cocoon removing mechanism, and then the cocoon cluster tool is pushed to one side by the cocoon moving mechanism and collected.

In order to meet the improvement requirements of silkworm farmers, further simplify the operation of the cocoon picking machine, reduce the labor intensity of cocoon picking, improve the picking efficiency, simplify the structure of the cocoon picking machine and reduce the cost of the cocoon picking machine, the applicant designs an electric cocoon picking machine for picking silkworm cocoons aiming at the existing cocooning cluster tool.

[ Utility model ] A method for manufacturing a semiconductor device

The utility model aims at providing an electronic cocoon collection machine uses this kind of silkworm cocoon collection machine, the silkworm cocoon cluster tool is direct to be put into the workstation of collecting the cocoon machine from the feeding end as long as with the cocooning machine, remove cocooning machine along table surface to separation comb claw one side, the cocoon collection machine just picks all once the cocoons on the cocooning machine automatically and leaves, need not artifical application of force separation, the cocoons of picking off directly drop to receive in the cocoon frame, there is not special technical requirement to the operation of silkworm raiser, the silkworm cocoon is picked thoroughly and high-efficiently, women, the old man homoenergetic is operated.

The utility model discloses the technical scheme who takes as follows: an electric cocoon picking machine is characterized in that: the cocooning tool shifting and driving device is fixed on the frame or on two guide edges, the cocooning tool shifting and driving device comprises a main shaft, shifting wheels and a servo motor, the shifting wheels are fixed on the main shaft 4 at intervals, the main shaft is driven by the servo motor, the shifting wheels drive the cocooning tools to move towards the direction of the separation comb claws along the upper end surface of the workbench, the lower ends of the separation comb claws are fixed on the workbench at equal intervals, a gap of 0.1-2 mm is reserved between the upper end of each separation comb claw and the top end surface of a cuboid cocoon containing cavity on the cocooning tool, the distance between every two adjacent separation comb claws is the same as the distance between the cuboid cocoon containing cavities on the cocooning tools, a separation comb is arranged at the middle position of each cuboid cocoon containing cavity right above the cocooning tools, the cocoon outlet comb is arranged on the workbench, and the cocoon outlet comb outlet is arranged at one side of the cocooning tool close to the cocoon inlet end of the cocooning tool.

Further, separation comb claw includes fixed section, linking arm and comb cocoon section, and the linking arm setting is between fixed section and comb cocoon section, and fixed section is fixed on the workstation, and comb cocoon section is located and corresponds the middle top in cuboid appearance cocoon chamber on the cocooning cluster utensil.

Furthermore, the included angle between the connecting arm and the upper end face of the workbench is 30-90 degrees.

Furthermore, the included angle between the connecting arm and the upper end face of the workbench is 45 degrees.

Further, the separating comb claws are staggered along the pulling direction.

Further, all the separating comb claws are staggered one by one in the pulling direction.

Furthermore, the cluster shifting driving device at least comprises more than 2 shifting wheels which are distributed at intervals, and the shifting wheels are positioned in the middle of the corresponding cuboid cocoon containing cavity on the cocooning cluster tool.

Furthermore, in the cluster tool shift driving device, the shift wheels are arranged on the main shaft at equal intervals through shaft sleeves, and the number of the shift wheels is the same as that of the cuboid cocoon accommodating cavities on the cocooning cluster tool.

Furthermore, in the cluster tool shifting driving device, the integral multiple of the length of the arc between the teeth of the shifting wheel is the same as the side length of the rectangular sash.

Furthermore, the combined part of the shifting wheel and the main shaft is fixed on the workbench through two bearing seat bodies, the servo motor is fixed on any one of the bearing seat bodies, and a housing is arranged above the combined part of the shifting wheel and the main shaft and covers the combined part of the shifting wheel and the main shaft.

The utility model discloses a work as follows:

placing cocooning frame of cocooning fruit to be picked on a workbench, enabling a rectangular frame to be upward and a cocoon falling column to be downward, as shown in figure 6, enabling the cocooning fruit to be located in a cuboid cocoon containing cavity formed by enclosing the cocoon falling columns on a transverse frame strip and a longitudinal frame strip, and enabling a separating comb claw to be structurally shown in figure 4 and comprise a fixed section, a connecting arm and a cocooning section, wherein the connecting arm is arranged between the fixed section and the cocooning section, the fixed section is fixed on the workbench, the cocooning section is located at the upper middle end of the cocooning frame corresponding to the cuboid cocoon containing cavity, the lower end face of the cocooning section is located at the upper end of the cocooning fruit, and the fixed section located at the lower end of the separating comb claw is fixed on the workbench at equal intervals, lie in the separation comb cocoon section of comb claw upper end and the lower terminal surface of the rectangle sash on the campon-cocoon cluster utensil and have 0.1 ~ 2 millimeters clearance, the linking arm sets up between fixed section and comb cocoon section, the lower terminal surface of comb cocoon section and the lower terminal surface of linking arm are from the smooth inclined plane that table surface distance gradually reduces, therefore, when campon-cocoon cluster utensil 7 removed along the up end of workstation, lie in that the cuboid holds the top of silkworm cocoon fruit in the cocoon chamber and oppress by the lower terminal surface of comb cocoon section earlier, then oppress by the lower terminal surface of linking arm again, realize breaking away from to the table surface direction, because silkworm cocoon fruit all around lean on the silk cover to fix on the cocoon post, when the top of silkworm cocoon fruit received downward effort, whole silkworm cocoon fruit will fall the cocoon post and move down and drop.

Because the integral multiple of the intertooth arc length of the poking and moving wheel is the same as the side length of the rectangular frame lattice on the cocooning tool, therefore, the utility model discloses a servo motor drives to poke and move the wheel, and then move the cocooning tool along the workstation by poking and moving the wheel and drive the cocooning tool to move, at the removal in-process, the separation comb claw that is distributed in each cuboid cocoon containing cavity of cocooning tool refutes the cocooning fruit from the cocoon post on the cocooning tool, the cocooning fruit falls into in receiving the cocoon frame from the cocoon notch that goes out in a centralized manner, this kind of cocoon picking scheme cocoon picking speed can be adjusted, as long as adjust servo motor's rotational speed just can, as long as put cocooning tool regularly into the workstation gently push away, make cocooning tool and cocooning tool shift the poking and moving wheel contact among the drive arrangement, the cocooning tool poking drive arrangement will automatically and unidirectionally pull cocooning tool, the cocooning tool breaks away from cocooning tool from, the cocooning tool can carry out high-efficient and thorough cocoon picking efficiency, and low labor intensity, the cocooning tool is suitable for picking simple and convenient silkworm family structure.

[ description of the drawings ]

FIG. 1 is a schematic structural view of the utility model with the cover removed;

FIG. 2 is a schematic view of the structure of the tuft moving driver after being folded from the table;

FIG. 3 is a schematic view of an exploded structure of a main shaft, a shifting wheel and a shaft sleeve in a cluster shifting driving device;

FIG. 4 is a schematic view of a structure of a separation comb;

FIG. 5 is a schematic view of a cocooning cluster tool;

fig. 6 is a schematic structural diagram of the cocooning cluster 7 driven by the shifting wheel 42 to move along the workbench 2, and in the moving process, the cocoons 75 in the rectangular cocoon accommodating cavity 74 are separated from the cocoon falling column 73 by the separation comb 5.

Fig. 7 is a schematic view of the appearance structure of the utility model after covering the housing.

In the figure: 1-a frame; 2-a workbench; 3-a guiding edge; 4-a cluster moving driving device; 5-separating comb claws; 6-cocoon outlet notch; 7-cocooning tufting; 8-bearing seat body; 9-a housing; 41-a main shaft; 42-a shifting wheel; 43-a servo motor; 44-shaft sleeve; 51-a stationary section; 52-a connecting arm; 53-cocoon section combing; 71-transverse frame strips; 72-longitudinal frame strips; 73-falling cocoon column; 74-a cuboid cocoon-containing chamber; 75-silkworm cocoon fruit.

[ detailed description ] embodiments

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example 1:

an electric cocoon picking machine, as shown in fig. 1-7, comprises a frame 1, a workbench 2, two guiding edges 3, a cluster shifting driving device 4, a separating comb claw 5, a cocoon outlet slot 6, a bearing seat 8 and a housing 9, wherein the workbench 2 is fixed on the frame 1, the two guiding edges 3 are arranged on the front and rear sides of the workbench 2, the inner side distance between the two guiding edges 3 is equal to the length or width of a cocooning cluster 7, the cluster shifting driving device 4 is fixed on the frame 1 or the two guiding edges 3, the cluster shifting driving device 4 comprises a main shaft 41, shifting wheels 42, a servo motor 43 and a shaft sleeve 44, the shifting wheels 42 are fixed on the main shaft 41 at equal intervals through the shaft sleeve 44, two ends of the main shaft 41 are respectively fixed on the frame 1 in a free rotation manner through the bearing seat 8, the servo motor 43 is fixed on the bearing seat 8, the rotation shaft of the servo motor 43 is directly connected with the main shaft 41, the servo motor 43 directly drives the main shaft 41, the shifting wheels 42 are installed on the main shaft 41 at equal intervals through shaft sleeves 44, the number of the shifting wheels 42 is the same as that of cuboid cocoon containing cavities 74 on the cocooning cluster 7, the shifting wheels 42 drive the cocooning cluster 7 to move towards the separating comb claws 5 along the upper end surface of the workbench 2, the lower ends of the separating comb claws 5 are fixed on the workbench 2 at equal intervals, gaps of 0.1-2 mm exist between the upper ends of the separating comb claws 5 and the lower end surface of the cuboid cocoon containing cavities 74 on the cocooning cluster 7, the distance between every two adjacent separating comb claws 5 is the same as that of the cuboid cocoon containing cavities 74 on the cocooning cluster 7, a separating comb claw 5 is arranged in the middle position opposite to each cuboid cocoon containing cavity 74 on the cocooning cluster 7, each separating comb claw 5 comprises a fixing section 51, a connecting arm 52 and a cocoon section 53, the connecting arm 52 sets up between fixed segment 51 and comb cocoon section 53, and fixed segment 51 is fixed on workstation 2, and comb cocoon section 53 is located and corresponds the middle upper end that cuboid holds cocoon chamber 74 on cocooning cluster utensil 7, and the contained angle between the up end of connecting arm 52 and workstation 2 is 30 ~ 90 degrees, preferentially chooses 45 degrees, and it offers on workstation 2 to go out cocoon notch 6, and is located cocooning cluster utensil 7 and gets into the position that the end is close to the stiff end one side of separation comb claw 5, housing 9 is safety protection casing, and it covers on the sub-assembly of dialling and moving wheel 42 and main shaft 41.

The utility model discloses a work as follows:

placing cocooning frame 7 of the cocoon fruits to be picked on the workbench 2, making the rectangular frame lattice upward and the cocoon falling column 72 downward, as shown in fig. 6, placing the cocoon fruits 75 in a rectangular cocoon containing cavity 74 enclosed by the transverse frame bar 71, the longitudinal frame bar 72 and the cocoon falling column 73, as shown in fig. 4, the separating comb 5 comprises a fixed section 51, a connecting arm 52 and a cocoon combing section 53, the connecting arm 52 is arranged between the fixed section 51 and the cocoon combing section 53, the fixed section 51 is fixed on the workbench 2, the cocoon combing section 53 is positioned at the middle upper end of the cocooning frame 7 corresponding to the rectangular cocoon containing cavity 74, the lower end face of the cocoon combing section 53 is positioned at the upper end of the cocoon 75, as the fixed section 51 positioned at the lower end of the separating comb 5 is fixed on the workbench 2 at equal intervals, a gap of 0.1-2 mm is reserved between a cocoon combing section 53 at the upper end of the separation comb claw 5 and the lower end face of the rectangular frame on the cocooning tool 7, the connecting arm 52 is arranged between the fixed section 51 and the cocoon combing section 53, the lower end face of the cocoon combing section 53 and the lower end face of the connecting arm 52 are smooth inclined planes with gradually decreasing distance from the working table surface, therefore, when the cocooning tool 7 moves along the upper end face of the working table 2, the top of a silkworm cocoon 75 in the cuboid cocoon containing cavity 74 is firstly pressed by the lower end face of the cocoon combing section 53 and then pressed by the lower end inclined plane of the connecting arm 52, separation towards the working table surface is realized, because the periphery of the silkworm cocoon 75 is fixedly sleeved on the cocoon falling column 73 by silk, and when the top of the silkworm cocoon 75 receives downward acting force, the whole silkworm cocoon 75 can move downwards and fall off along the cocoon falling column 73.

Because the integer multiple of the intertooth arc length of the poking wheel 42 is the same as the length dimension of the cuboid cocoon containing lattice 71, therefore, the utility model discloses a servo motor 43 drives the poking wheel 42, and then the poking wheel 42 drives the cocooning cluster tool 7 to move along the workbench 2, in the moving process, the cocooning fruits are separated from the cocooning cluster tool 7 by the separating comb claws 5 distributed in each cuboid cocoon containing lattice of the cocooning cluster tool 7, and the cocooning fruits fall into the cocoon collecting frame from the cocoon outlet 6 in a concentrated manner, the cocooning speed of the cocooning collecting scheme can be adjusted, as long as the rotating speed of the servo motor 43 is adjusted, as long as the cocooning cluster tool 7 is put into the workbench to be pushed slightly in a regular manner, so that the cocooning cluster tool 7 contacts with the poking wheel 42 in the cluster tool poking driving device 4, the cluster tool poking driving device 4 can automatically pull the cocooning cluster tool 7 in a single direction, the cocooning fruits are separated from the cocooning cluster tool 7, the cocoons can be carried out of the cocoons, the cocoons poking tool can carry out the high-efficiency and the cocoons can be easily picked, the cocoons can be easily picked in a low-picking operation, and the cocoons can be suitable for a simple and the cocoons of a large-scale.

Example 2: the difference from the embodiment 1 is that: all the separating fingers 5 are offset in the direction of the displacement, so that the servo motor 43 consumes less power.

Because the utility model discloses a servo motor 43 drives camptos and cocoons cluster utensil 7 and removes along workstation 2, in the removal process, separation comb claw 5 by distributing in each cuboid of camptos and cocoons cluster utensil 7 holds cocoon chamber 74 breaks away from silkworm cocoon fruit 75 from camptos and cocoons cluster utensil 7, silkworm cocoon fruit 75 concentrates to fall into from going out cocoon notch 6 and receives in the cocoon frame, this kind of cocoon picking scheme cocoon speed can be adjusted, as long as adjust servo motor 43's rotational speed just can, silkworm raiser need only put camptos and cocoons cluster utensil 7 regularly into the workstation gently push, make camptos and cocoons cluster utensil 7 and cluster utensil shift the shifting wheel 42 contact in the drive arrangement 4 can, it will automatic one-way pull camptos and cocoons cluster utensil 7 to dial drive arrangement 4, break away silkworm cocoon fruit 75 from camptos and cocoons cluster utensil 7, the silkworm cocoons cluster utensil 75 can carry out high efficiency and thorough cocoon picking freely, not only efficiency is high, and intensity is low, convenient and light in labor intensity, simple mechanical structure, low mechanical structure, the practicality, silkworm raiser silkworm cocoons cluster utensil practicality is strong, silkworm raiser and cocoons cluster cocoon picking is suitable for a household is concentrated again.

The present invention can be implemented in many ways, and the above examples are only preferred embodiments listed by the applicant. It will be appreciated by those skilled in the art that there are many other alternatives that are equivalent to the embodiments described above. All functional substitutions belong to the protection scope of the utility model without departing from the spirit or essential characteristics of the utility model.

Claims (10)

1. An electric cocoon picking machine is characterized in that: comprises a frame (1), a workbench (2), guide edges (3), a tufting shifting driving device (4), separating comb claws (5) and a cocoon outlet notch (6), wherein the workbench (2) is fixed on the frame (1), the two guide edges (3) are arranged on the front side and the rear side of the workbench (2), the inner side distance between the two guide edges (3) is equivalent to the length or the width of the cocooning tufting (7), the tufting shifting driving device (4) is fixed on the frame (1) or the two guide edges (3), the tufting shifting driving device (4) comprises a main shaft (41), shifting wheels (42) and a servo motor (43), the shifting wheels (42) are fixed on the main shaft (41) at intervals, the main shaft (41) is driven by a servo motor (43), the shifting wheel (42) drives the cocooning cluster tool (7) to move towards the separating comb claw (5) along the upper end surface of the workbench (2), the lower end of the separating comb claw (5) is fixed on the workbench (2) at equal intervals, a gap of 0.1-2 mm is reserved between the upper end of the separating comb claw (5) and the top end surface of a cuboid cocoon containing cavity (74) on the cocooning cluster tool (7), the distance between two adjacent separating comb claws (5) is the same as the distance between the cuboid cocoon containing cavities (74) on the cocooning cluster tool (7), and the distance is right at the middle position of each cuboid cocoon containing cavity (74) on the cocooning cluster tool (7) Both are provided with a separating comb claw (5), a cocoon outlet notch (6) is arranged on the workbench (2) and is positioned at the position of one side of the inlet end of the cocooning cluster tool (7) close to the fixed end of the separating comb claw (5).

2. The electric cocoon harvesting machine as claimed in claim 1, wherein: separation comb claw (5) are including fixed section (51), connecting arm (52) and comb cocoon section (53), and connecting arm (52) set up between fixed section (51) and comb cocoon section (53), and fixed section (51) are fixed on workstation (2), and comb cocoon section (53) are located and correspond the middle top that cuboid holds cocoon chamber (74) on cocooning cluster utensil (7).

3. An electric cocoon harvesting machine as claimed in claim 2, characterized in that: the included angle between the connecting arm (52) and the upper end surface of the workbench (2) is 30-90 degrees.

4. An electric cocoon harvesting machine as claimed in claim 3, characterized in that: the angle between the connecting arm (52) and the upper end face of the workbench (2) is 45 degrees.

5. The electric cocoon harvesting machine as claimed in claim 1, wherein: the separating comb claws (5) are staggered along the pulling direction.

6. The electric cocoon harvesting machine as claimed in claim 5, wherein: all the separating comb claws (5) are staggered one by one along the pulling direction.

7. The electric cocoon harvesting machine according to claim 1, characterized in that: the cluster shifting driving device (4) at least comprises more than 2 shifting wheels (42) which are distributed at intervals, and the shifting wheels (42) are positioned in the middle of a corresponding cuboid cocoon containing cavity (74) on the cocooning cluster (7).

8. The electric cocoon harvesting machine according to claim 1, characterized in that: in the cluster shifting driving device (4), shifting wheels (42) are installed on a main shaft (41) at equal intervals through shaft sleeves (44), and the number of the shifting wheels (42) is the same as that of cuboid cocoon containing cavities (74) on a cocooning cluster (7).

9. The electric cocoon harvesting machine as claimed in claim 1, wherein: in the tufting tool shifting driving device (4), integral multiples of the tooth space arc length of the shifting wheel (42) are the same as the side length of the rectangular sash.

10. The electric cocoon harvesting machine according to claim 1, characterized in that: the combined part of the shifting wheel (42) and the main shaft (41) is fixed on the workbench (2) through two bearing base bodies (8), the servo motor (43) is fixed on any bearing base body (8), a cover shell (9) is arranged above the combined part of the shifting wheel (42) and the main shaft (41), and the cover shell (9) covers the combined part of the shifting wheel (42) and the main shaft (41).

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