Electric cocoon picking machine

Abstract

A kind of electric cocoon picking machine, including frame, workbench, guide edge, separation comb claw, cocoon outlet slot, servo motor, cluster tool moves driving device, workbench is fixed on frame, two guide edges are arranged in the front and back of workbench, the inside distance between two guide edges is equivalent to silkworm cocoon cluster tool, cluster tool moves driving device is fixed on frame, cluster tool moves driving device can drive silkworm cocoon cluster tool to move horizontally along workbench, the lower end of separation comb claw is fixed on workbench with equal interval, cocoon outlet slot is opened in the feeding end side of workbench close to the fixed end of separation comb claw.Even if silkworm farmer directly puts silkworm cocoon cluster tool from feeding end into workbench, moves along workbench towards separation comb claw side, silkworm cocoon on silkworm cocoon cluster tool can be automatically picked off all at once, directly falls into the cocoon frame, and the efficiency of picking cocoon is high, the labor intensity is low, the equipment cost is low, the operation is simple, and silkworm farmer will use.

Description

[Technical Field]

[0001] This utility model relates to the field of silkworm cocoon harvesting technology, and in particular to a cocoon harvesting machine. [Background Technology]

[0002] In the silkworm rearing process, silkworm cocoons accumulate on cocoon-forming devices. Traditionally, these devices were straw cages, but now commonly used are industrially produced plastic products. The applicant disclosed "a novel cocoon-forming device" in ZL202010640131.1. Figure 1 As shown, the device includes a cocooning frame and supporting legs. The cocooning frame consists of horizontal frame bars, vertical frame bars, and cocoon dropping columns. One end of each supporting leg is equipped with a supporting shaft, and the supporting shaft and the supporting shaft hole are mating components. This novel cocooning device improves the silk reeling rate. The cocooning frame is supported on the ground by the supporting legs, improving the overall air permeability of the device. Furthermore, the cocoon dropping columns on the horizontal and vertical frame bars are arranged horizontally and vertically at intervals, making full use of space. While ensuring a sufficient number of cocoon dropping columns, it also leaves enough space for cocooning, increasing the cocooning rate. Simultaneously, the cross-section of the cocoon dropping columns is non-circular, and can be polygonal or star-shaped, facilitating silk hanging and improving the cocooning rate. This patent successfully optimizes and improves existing cocooning devices, creating the foundation for mechanized cocoon harvesting in the future.

[0003] The applicant disclosed a "composite cocooning and harvesting device" in 202010640350.X. This composite cocooning and harvesting device includes a cocooning frame, a cocoon harvesting frame, and support legs. The cocooning frame includes horizontal frame strips, vertical frame strips, and cocoon dropping columns. The horizontal and vertical frame strips are arranged perpendicularly to form several cuboid cocoon-containing cells. On the same side of the horizontal and vertical frame strips of each cuboid cocoon-containing cell, there are vertically spaced cocoon dropping columns, and the cocoon dropping columns on the horizontal and vertical frame strips are staggered with each other in the horizontal and vertical directions. The cocoon harvesting frame is a cocoon harvesting frame cell composed of horizontal cluster strips and vertical cluster strips arranged perpendicularly to each other. The support legs are arranged at intervals on the side of the cocooning frame where there are no cocoon dropping columns. The cocoon harvesting frame is fitted onto the side of the cocooning frame where there are cocoon dropping columns. The fitting requirements between the cocoon harvesting frame and the cocooning frame are: each cocoon-containing cell has horizontal cluster strips or vertical cluster strips, or both horizontal and vertical cluster strips.

[0004] This patented solution separates the cocoons from the cocooning frame using a cocoon-collecting frame. This is a basic manual cocoon-collecting method. Although it can solve the problem of manual cocoon collection and its efficiency is much higher than the traditional harvesting method, which is all done by hand, the labor intensity of the operator is too high. Women and the elderly generally cannot pull it, so it is difficult to promote and apply.

[0005] To achieve mechanized cocoon harvesting, the applicant disclosed a cocoon harvesting machine in patent number 202021363219.5, which includes a side plate frame, a cocoon removal mechanism, a positioning and pressing mechanism, a cocoon transfer mechanism, a left fixed seat, and a right fixed seat. The side plate frame is formed by four rectangular side plates that are vertically fixed end to end, and the left fixed seat and the right fixed seat are fixed to the four corners of the top of the side plate frame, respectively. The positioning and pressing mechanism consists of a first movable rod, a square groove, a pressing plate, an opening groove, a first positioning hook plate, a pin, a first connecting rod, a sleeve rod, an eccentric sleeve, a crank handle, a second movable rod, a second connecting rod, a second positioning hook plate, a sleeve plate, and a third positioning hook plate. The cocoon removal mechanism consists of a support plate, a cocoon top column, a top rod, a hinge sleeve, a support rod, a connecting frame, and a pedal. The cocoon transfer mechanism consists of a guide rod, a guide sleeve, a fixed rod, a mounting plate, and a push rod.

[0006] This is a design for a silkworm cocoon collection machine based on the applicant's invention of a cocoon-forming device. Although it achieves mechanized cocoon collection, the entire cocoon collection machine has a complex structure and is cumbersome to operate. First, a positioning and pressing mechanism is used to smoothly press and fix the cocoon-forming device. Then, a cocoon-removing mechanism is used to push the cocoons on the cocoon-forming column away from the device. Finally, a cocoon-transferring mechanism is used to push the cocoons to one side for collection. As can be seen from the specific usage requirements in the instruction manual, it requires high technical skills from the user and is not easy for silkworm farmers to master. The acceptance of this equipment is low. Improvements are required to enhance ease of use, further reduce labor intensity, increase production efficiency, and achieve electromechanicalization.

[0007] In order to meet the improvement requirements put forward by silkworm farmers, further simplify the operation of cocoon harvesting machines, reduce the labor intensity of cocoon harvesting, improve harvesting efficiency, simplify the structure of cocoon harvesting machines, and reduce the cost of cocoon harvesting machines, the applicant has designed an electric cocoon harvesting machine for harvesting silkworm cocoons based on existing cocoon-forming equipment. [Utility Model Content]

[0008] The purpose of this utility model is to provide an electric cocoon harvesting machine. Using this cocoon harvesting machine, silkworm farmers only need to place the cocoon-forming tool directly into the worktable of the cocoon harvesting machine from the feeding end, and move the cocoon-forming tool along the side of the worktable facing the separation comb claw. The cocoon harvesting machine will automatically pick all the cocoons on the cocoon-forming tool at once, without the need for manual force to separate them. The picked cocoons fall directly into the cocoon collection frame. There are no special technical requirements for the operation of silkworm farmers. The cocoon harvesting is thorough and efficient, and women and the elderly can operate it.

[0009] The technical solution adopted by this utility model is as follows: An electric cocoon harvesting machine, characterized in that it includes a frame, a worktable, guide edges, a cocoon cluster shifting drive device, a separating comb, and a cocoon outlet. The worktable is fixed on the frame, and two guide edges are arranged on the front and rear sides of the worktable. The inner distance between the two guide edges is approximately equal to the length or width of the cocoon cluster. The cocoon cluster shifting drive device is fixed on the frame or on the two guide edges. The cocoon cluster shifting drive device includes a main shaft, shifting wheels, and a servo motor. The shifting wheels are fixed at intervals on the main shaft, and the main shaft is driven by a servo motor. The shifting wheel drives the cocoon-forming tool to move along the upper surface of the workbench towards the separating comb claws. The lower ends of the separating comb claws are fixed to the workbench at equal intervals. The upper ends of the separating comb claws have a gap of 0.1 to 2 mm with the top surface of the cuboid cocoon cavity on the cocoon-forming tool. The distance between two adjacent separating comb claws is the same as the distance between the cuboid cocoon cavities on the cocoon-forming tool. A separating comb claw is provided in the middle position of each cuboid cocoon cavity on the cocoon-forming tool. The cocoon exit slot is opened on the workbench and is located on the side of the cocoon-forming tool's entry end near the fixed end of the separating comb claw.

[0010] Furthermore, the separating comb claw includes a fixed section, a connecting arm, and a cocoon combing section. The connecting arm is disposed between the fixed section and the cocoon combing section. The fixed section is fixed on the workbench, and the cocoon combing section is located at the middle top of the cuboid cocoon cavity on the cocoon-forming device.

[0011] Furthermore, the angle between the connecting arm and the upper surface of the worktable is 30 to 90 degrees.

[0012] Furthermore, the angle between the connecting arm and the upper surface of the worktable is 45 degrees.

[0013] Furthermore, the separating comb claws are staggered along the pulling direction.

[0014] Furthermore, all the separating comb claws are staggered one by one along the pulling direction.

[0015] Furthermore, the cocoon-forming tool shifting drive device includes at least two shifting wheels spaced apart, and the shifting wheels are located in the middle of the corresponding cuboid cocoon cavity on the cocoon-forming tool.

[0016] Furthermore, in the cocooning tool shifting drive device, the shifting wheels are mounted on the main shaft at equal intervals via bushings, and the number of shifting wheels is the same as the number of cuboid cocoon cavities located on the cocooning tool.

[0017] Furthermore, in the cluster shifting drive device, the arc length between the teeth of the shifting wheel is an integer multiple of the side length of the rectangular frame.

[0018] Furthermore, the assembly of the shift wheel and the main shaft is fixed to the worktable by two bearing seats, the servo motor is fixed on either bearing seat, and a cover is provided above the assembly of the shift wheel and the main shaft, the cover covering the assembly of the shift wheel and the main shaft.

[0019] The working principle of this utility model is as follows:

[0020] Place the cocoon-forming equipment containing the silkworm cocoons to be harvested on the workbench, with the rectangular frame facing upwards and the cocoon-dropping column facing downwards. Figure 6 As shown, the silkworm cocoons are all located within a rectangular cocoon cavity formed by cocoon-dropping columns on horizontal and vertical frames, while the structure of the separating comb claws is as follows: Figure 4 As shown, the device includes a fixed section, a connecting arm, and a cocoon combing section. The connecting arm is positioned between the fixed section and the cocoon combing section. The fixed section is fixed to the worktable. The cocoon combing section is located at the upper middle of the corresponding rectangular cocoon cavity on the cocoon-forming device. The lower end of the cocoon combing section is located at the upper end of the cocoon fruit. Because the fixed sections located at the lower end of the separating comb claws are fixed to the worktable at equal intervals, there is a gap of 0.1–2 mm between the cocoon combing section located at the upper end of the separating comb claws and the lower end of the rectangular frame on the cocoon-forming device. The connecting arm is positioned between the fixed section and the cocoon combing section. Between them, the lower end face of the cocoon combing section and the lower end face of the connecting arm are smooth inclined surfaces with gradually decreasing distance from the workbench surface. Therefore, when the cocoon clustering tool 7 moves along the upper end face of the workbench, the top of the cocoon fruit located in the cuboid cocoon cavity is first pressed by the lower end face of the cocoon combing section, and then by the lower inclined surface of the connecting arm, thus detaching it towards the workbench surface. Because the cocoon fruit is secured to the cocoon dropping column by silk, when the top of the cocoon fruit is subjected to a downward force, the entire cocoon fruit will move downward along the cocoon dropping column and fall off.

[0021] Since the arc length between the teeth of the shifting wheel is an integer multiple of the side length of the rectangular grid on the cocoon-collecting device, this invention uses a servo motor to drive the shifting wheel, which in turn moves the cocoon-collecting device along the worktable. During this movement, the separating combs distributed in the cuboid cocoon cavities of the cocoon-collecting device separate the silkworm cocoons from the cocoon-dropping columns on the device. The cocoons then fall from the cocoon-exit trough into the cocoon-collecting frame. This cocoon-collecting method allows for adjustable collection speeds; simply adjusting the servo motor's speed is sufficient. The silkworm farmer only needs to adjust the... Simply place the cocoon-rearing tool onto the workbench and gently push it to make it contact the shifting wheel in the tool shifting drive device. The tool shifting drive device will then automatically pull the cocoon-rearing tool in one direction, detaching the silkworm cocoons from the tool. Silkworm farmers can easily and efficiently harvest cocoons at home. Not only is the harvesting efficiency high, but the labor intensity is also low. The operation is convenient and easy, the mechanical structure is simple, the cost is low, and the practicality is strong. It is suitable for both individual silkworm farmers to harvest cocoons locally and for large-scale centralized cocoon harvesting by households raising silkworms. [Attached Image Description]

[0022] Figure 1 This is a schematic diagram of the structure of this utility model after the cover has been removed;

[0023] Figure 2 This is a schematic diagram of the structure after the cluster-moving drive device has been folded away from the worktable;

[0024] Figure 3 This is an exploded structural diagram of the main shaft, shifting wheel and bushing in the cluster shifting drive device;

[0025] Figure 4 This is a schematic diagram of a structure for separating comb claws;

[0026] Figure 5 This is a schematic diagram of the structure of a cocooning device;

[0027] Figure 6 This is a schematic diagram of the structure in which the shifting wheel 42 drives the cocoon clustering tool 7 to move along the workbench 2. During the movement, the separating comb claw 5 detaches the silkworm cocoon fruit 75 located in the rectangular cocoon cavity 74 from the cocoon dropping column 73.

[0028] Figure 7 This is a schematic diagram of the external structure of this utility model after the cover is applied.

[0029] In the diagram: 1-Frame; 2-Workbench; 3-Guide edge; 4-Cocooning tool shifting drive device; 5-Separating comb claw; 6-Cocoon exit slot; 7-Cocooning tool; 8-Bearing seat; 9-Cover; 41-Main shaft; 42-Shifting wheel; 43-Servo motor; 44-Shaft sleeve; 51-Fixed section; 52-Connecting arm; 53-Cocoon combing section; 71-Transverse frame bar; 72-Vertical frame bar; 73-Cocoon dropping column; 74-Cuboid cocoon cavity; 75-Cocoon fruit.

Detailed Implementation Methods

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Example 1:

[0032] An electric cocoon harvesting machine, such as Figure 1-7As shown, the device includes a frame 1, a worktable 2, guide edges 3, a cocoon-forming tool shifting drive device 4, a separating comb 5, a cocoon exit slot 6, a bearing seat 8, and a cover 9. The worktable 2 is fixed on the frame 1. Two guide edges 3 are located on the front and rear sides of the worktable 2. The inner distance between the two guide edges 3 is approximately equal to the length or width of the cocoon-forming tool 7. The cocoon-forming tool shifting drive device 4 is fixed on the frame 1 or on the two guide edges 3. The cocoon-forming tool shifting drive device 4 includes a main shaft 41, a shifting wheel 42, a servo motor 43, and a bushing 44. The servo motor 42 is fixed to the main shaft 41 at equal intervals via bushings 44. Both ends of the main shaft 41 are rotatably fixed to the frame 1 via bearing seats 8. The servo motor 43 is fixed to the bearing seats 8, and its rotation shaft is directly connected to the main shaft 41, directly driving the main shaft 41. The shifting wheels 42 are installed on the main shaft 41 at equal intervals via bushings 44. The number of shifting wheels 42 is the same as the number of cuboid cocoon cavities 74 located on the cocoon-forming device 7. The shifting wheels 42 drive the cocoon-forming device 7 along the worktable. 2. The upper end moves towards the separating comb claw 5. The lower end of the separating comb claw 5 is fixed at equal intervals on the worktable 2. There is a gap of 0.1 to 2 mm between the upper end of the separating comb claw 5 and the lower end face of the cuboid cocoon cavity 74 on the cocoon-forming device 7. The distance between two adjacent separating comb claws 5 is the same as the spacing between the cuboid cocoon cavities 74 on the cocoon-forming device 7. A separating comb claw 5 is provided in the middle position of each cuboid cocoon cavity 74 on the cocoon-forming device 7. The separating comb claw 5 includes a fixed section 51, a connecting arm 52, and a combing section 53. The connecting arm 52 is positioned 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 located at the upper middle part of the cuboid cocoon cavity 74 on the cocoon-forming tool 7. The angle between the connecting arm 52 and the upper end face of the workbench 2 is 30 to 90 degrees, preferably 45 degrees. The cocoon outlet 6 is opened on the workbench 2 and is located on the side of the fixed end of the cocoon-forming tool 7 near the fixed end of the separating comb claw 5. The cover 9 is a safety cover that covers the combination of the shifting wheel 42 and the main shaft 41.

[0033] The working principle of this utility model is as follows:

[0034] Place the cocoon-forming device 7, containing the silkworm cocoons to be harvested, on the workbench 2, with the rectangular frame facing upwards and the cocoon-dropping column 72 facing downwards. Figure 6 As shown, the silkworm cocoons 75 are all located within a rectangular cocoon cavity 74 formed by transverse frame bars 71, longitudinal frame bars 72, and a cocoon-dropping column 73, while the structure of the separating comb claws 5 is as follows: Figure 4As shown, the device includes a fixed section 51, a connecting arm 52, and a cocoon combing section 53. The connecting arm 52 is positioned between the fixed section 51 and the cocoon combing section 53. The fixed section 51 is fixed to the workbench 2. The cocoon combing section 53 is located at the upper middle of the rectangular cocoon cavity 74 on the cocoon-forming device 7. The lower end of the cocoon combing section 53 is located at the upper end of the cocoon fruit 75. Because the fixed sections 51 located at the lower end of the separating comb claws 5 are fixed to the workbench 2 at equal intervals, there is a gap of 0.1 to 2 mm between the cocoon combing section 53 located at the upper end of the separating comb claws 5 and the lower end of the rectangular frame on the cocoon-forming device 7. The connecting arm 52 is positioned between the fixed section 51 and the cocoon combing section 53. Between the cocoon combing section 53 and the lower end face of the connecting arm 52, the distance from the workbench surface gradually decreases. Therefore, when the cocoon-forming tool 7 moves along the upper end face of the workbench 2, the top of the cocoon fruit 75 located in the cuboid cocoon cavity 74 is first pressed by the lower end face of the cocoon combing section 53, and then pressed by the lower end slope of the connecting arm 52, thus detaching it towards the workbench surface. Because the cocoon fruit 75 is secured to the cocoon dropping column 73 by silk, when the top of the cocoon fruit 75 is subjected to a downward force, the entire cocoon fruit 75 will move downward along the cocoon dropping column 73 and fall off.

[0035] Since the arc length between the teeth of the shifting wheel 42 is an integer multiple of the length of the cuboid cocoon-containing grid 71, this invention uses a servo motor 43 to drive the shifting wheel 42, which in turn drives the cocoon-forming device 7 to move along the worktable 2. During the movement, the separating combs 5 distributed in each cuboid cocoon-containing grid of the cocoon-forming device 7 detach the silkworm cocoons from the cocoon-forming device 7, and the silkworm cocoons fall from the cocoon-forming device 7 into the cocoon-collecting frame from the cocoon-exit trough 6. The cocoon-collecting speed of this method can be adjusted simply by adjusting the speed of the servo motor 43. Silkworm farmers only need to... The cocoon-forming tool 7 is placed regularly on the workbench and gently pushed to make it contact the shifting wheel 42 in the tool shifting drive device 4. The tool shifting drive device 4 will then automatically pull the cocoon-forming tool 7 in one direction, detaching the silkworm cocoons from the tool. Silkworm farmers can easily and thoroughly harvest cocoons at home. Not only is the harvesting efficiency high, but the labor intensity is also low. The operation is convenient and easy. The mechanical structure is simple, the cost is low, and the practicality is strong. It is suitable for both individual silkworm farmers to harvest cocoons locally and for large-scale centralized cocoon harvesting by silkworm farmers.

[0036] Example 2: The difference from Example 1 is that all the separating comb claws 5 are staggered along the pulling direction, so that the servo motor 43 consumes less power.

[0037] Because this invention uses a servo motor 43 to drive the cocoon-forming tool 7 to move along the worktable 2, during the movement, the separating combs 5 distributed in the cuboid cocoon cavities 74 of the cocoon-forming tool 7 detach the silkworm cocoons 75 from the cocoon-forming tool 7. The silkworm cocoons 75 then fall from the cocoon exit trough 6 into the cocoon collection frame. This cocoon collection method allows for adjustable collection speed; simply adjusting the rotation speed of the servo motor 43 is sufficient. The silkworm farmer only needs to regularly place the cocoon-forming tool 7 onto the worktable and gently push it to allow the cocoon-forming tool to move. Once the cocoon cluster 7 comes into contact with the shifting wheel 42 in the cluster shifting drive device 4, the cluster shifting drive device 4 will automatically pull the cocoon cluster 7 in one direction, detaching the silkworm cocoon 75 from the cocoon cluster 7. Silkworm farmers can easily and efficiently harvest cocoons at home. Not only is the harvesting efficiency high, but the labor intensity is also low. The operation is convenient and easy. The mechanical structure is simple, the cost is low, and the practicality is strong. It is suitable for both individual silkworm farmers to harvest cocoons locally and for large-scale centralized cocoon harvesting by silkworm farmers in households.

[0038] There are many embodiments of this utility model, and the above embodiments are only the preferred embodiments listed by the applicant. Those skilled in the art should know that there are many other solutions that are equivalent to the above embodiments. All functional substitutions are within the protection scope of this utility model without departing from its spirit or essential characteristics.

Claims

1. An electric cocoon harvesting machine, characterized in that: The cocoon set includes a frame (1), a worktable (2), guide edges (3), a cocoon-forming tool shifting drive device (4), a separating comb (5), and a cocoon exit slot (6). The worktable (2) is fixed on the frame (1). Two guide edges (3) are set on the front and rear sides of the worktable (2). The inner distance between the two guide edges (3) is equivalent to the length or width of the cocoon-forming tool (7). The cocoon-forming tool shifting drive device (4) is fixed on the frame (1) or on the two guide edges (3). The cocoon-forming tool shifting drive device (4) includes 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 the servo motor (43). The cocoon-forming tool (7) is moved along the upper end of the workbench (2) towards the separation comb (5). The lower ends of the separation comb (5) are fixed on the workbench (2) at equal intervals. The upper end of the separation comb (5) and the top surface of the cuboid cocoon cavity (74) on the cocoon-forming tool (7) have a gap of 0.1 to 2 mm. The distance between two adjacent separation combs (5) is the same as the distance between the cuboid cocoon cavities (74) on the cocoon-forming tool (7). A separation comb (5) is provided in the middle position of each cuboid cocoon cavity (74) on the cocoon-forming tool (7). The cocoon outlet (6) is opened on the workbench (2) and is located on the side of the cocoon-forming tool (7) near the fixed end of the separation comb (5).

2. The electric cocoon harvesting machine according to claim 1, characterized in that: The separating comb (5) includes a fixed section (51), a connecting arm (52) and a cocoon combing section (53). The connecting arm (52) is located 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 located at the top center of the cuboid cocoon cavity (74) on the cocoon clustering tool (7).

3. The electric cocoon harvesting machine according to claim 2, characterized in that: The angle between the connecting arm (52) and the upper end face of the worktable (2) is 30 to 90 degrees.

4. The electric cocoon harvesting machine according to claim 3, characterized in that: The angle between the connecting arm (52) and the upper surface of the worktable (2) is 45 degrees.

5. The electric cocoon harvesting machine according to claim 1, characterized in that: The separation comb claws (5) are staggered along the pulling direction.

6. The electric cocoon harvesting machine according to claim 5, characterized in that: 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: in The cocoon-forming tool shifting drive device (4) includes at least two shifting wheels (42) spaced apart, and the shifting wheels (42) are located in the middle of the corresponding cuboid cocoon cavity (74) on the cocoon-forming tool (7).

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

9. The electric cocoon harvesting machine according to claim 1, characterized in that: in In the cluster shifting drive device (4), the integer multiple of the inter-tooth arc length of the shifting wheel (42) is the same as the side length of the rectangular frame.

10. The electric cocoon harvesting machine according to claim 1, characterized in that: The assembly of the shift wheel (42) and the main shaft (41) is fixed on the worktable (2) by two bearing seats (8). The servo motor (43) is fixed on either bearing seat (8). A cover (9) is provided above the assembly of the shift wheel (42) and the main shaft (41), and the cover (9) covers the assembly of the shift wheel (42) and the main shaft (41).

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