Asparagus lettuce bundling mechanism and asparagus lettuce harvester

Abstract

The asparagus lettuce bundling mechanism comprises a containing cavity used for containing asparagus lettuce to be bundled, and the top of the containing cavity is open; a rotating ring is arranged behind the containing cavity, and a placing pile used for placing adhesive tape is fixedly arranged on the front end face of the rotating ring. An adsorption assembly and a cutting assembly are further arranged on the side of the rotating ring. A push plate capable of moving in the front-back direction of the containing cavity is arranged above the containing cavity. According to the asparagus lettuce bundling device, asparagus lettuces to be bundled are firstly fed into the containing cavity and then pushed to the rotating ring through the push plate, adhesive tape winding can be conducted through the adsorption assembly and the cutting assembly, and finally the bundled asparagus lettuces are sent out through the push plate, so that continuous operation of asparagus lettuce bundling can be achieved, asparagus lettuce accumulation is avoided, and the bundling and harvesting efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lettuce harvesting equipment, and particularly relates to a lettuce bundling mechanism and a lettuce harvester. Background Art

[0002] Lettuce is a common vegetable crop. According to statistics, the annual output of lettuce in the country is about 8 million tons. Among them, the output in Shandong, Jiangsu, Hebei, Anhui, Zhejiang and other places is relatively high. Zhejiang Province is one of the main producing areas of lettuce in the country, and its lettuce planting area and output rank among the top in the country.

[0003] During the lettuce harvesting season, a large amount of lettuce needs to be harvested quickly and effectively to avoid overripeness or rot. The traditional manual harvesting method is difficult to meet this requirement. Therefore, in recent years, various types of lettuce harvesters have emerged to improve the harvesting speed and processing capacity.

[0004] Although the current lettuce harvesters can harvest lettuce relatively quickly, in the lettuce bundling stage, manual assistance is still required. For example, in the patent application with the publication number CN 118486387 A, after bundling the lettuce, manual assistance is needed to take out the bundled lettuce from the side of the bundling basket. Otherwise, the lettuce will accumulate in the bundling basket, making it difficult to achieve continuous harvesting. Summary of the Invention

[0005] The purpose of the present invention is to provide a lettuce bundling mechanism and a lettuce harvester, which can realize continuous bundling of lettuce to avoid the accumulation of bundled lettuce in the harvester.

[0006] The present invention adopts the following technical solutions: A lettuce bundling mechanism includes a receiving cavity for accommodating the lettuce to be bundled, and the top of the receiving cavity is open;

[0007] A rotating ring is arranged behind the receiving cavity, and a placing post for placing the tape is fixedly arranged on the front end face of the rotating ring;

[0008] An adsorption component and a cutting component are also arranged on the side of the rotating ring;

[0009] A push plate that can move along the front-back direction of the receiving cavity is arranged above the receiving cavity; wherein, when the push plate is at the first predetermined position, the rotating ring rotates to bundle the lettuce to be bundled; when the push plate moves from the first predetermined position to the second predetermined position, the bundled lettuce is sent out from the rotating ring to the outside.

[0010] Further, an inner ring is embedded in the inner circle of the rotating ring, and the inner ring is connected to the rotating ring through a rotating member.

[0011] Further, the placing post is rod-shaped and is perpendicularly arranged with respect to the front end face of the rotating ring.

[0012] Further, the adsorption component includes a suction cup, and the suction cup faces the lettuce to be baled;

[0013] The suction cup is connected to a vertically arranged first lead screw through a first connecting block;

[0014] Wherein, when the first lead screw rotates driven by a first motor, the first connecting block drives the suction cup to move up and down to realize the adsorption of the free end of the tape.

[0015] Further, the cutting component includes a cutting blade, and the cutting edge direction of the cutting blade faces the lettuce to be baled;

[0016] The cutting blade is connected to a vertically arranged second lead screw through a second connecting block;

[0017] Wherein, when the second lead screw rotates driven by a second motor, the second connecting block drives the cutting blade to move up and down to realize the cutting of the tape.

[0018] Further, the swivel ring is a gear, and the gear is connected to a third motor through a driving gear.

[0019] Another technical solution of the present invention: A lettuce harvester includes the above-mentioned lettuce baling mechanism;

[0020] A lettuce baling mechanism is installed on the rear frame body, and the rear frame body is further connected to a front frame body. A topping mechanism, a root cutting mechanism, a transmission mechanism, and a leaf removing mechanism are respectively installed on the front frame body;

[0021] Wherein, tires are installed at the bottoms of both the front frame body and the rear frame body.

[0022] Further, a lettuce transmission channel running in the front-rear direction is provided on the front frame body;

[0023] The transmission mechanism includes several groups of transmission belt groups;

[0024] The transmission belt group includes transmission belts respectively arranged in the transmission channel, and the surface of the transmission belt faces the transmission channel; wherein, the distance between the transmission belts corresponding to both sides in the transmission belt group is less than a predetermined distance.

[0025] Further, the leaf removing mechanism includes a cutting blade group arranged on the front frame body;

[0026] The cutting blade group includes a fixed blade and a moving blade;

[0027] The fixed blade is plate-shaped and its side faces the transmission channel. A plurality of first strip-shaped holes are opened at the front end thereof in the backward direction, and the plurality of first strip-shaped holes are arranged at intervals up and down;

[0028] The moving blade is plate-shaped and its side faces the transmission channel, and a plurality of second strip-shaped holes are opened at the front end thereof in the backward direction, and the plurality of second strip-shaped holes are arranged at intervals up and down;

[0029] The fixed blade is provided with a rear limit plate and a front limit plate arranged in the up and down directions;

[0030] The upper and lower ends of the movable blade are respectively provided with front baffles in upper and lower directions;

[0031] The rear end of the movable blade is fitted with the front end of the rear limit plate, and the front end of the front baffle is fitted with the rear end of the front limit plate;

[0032] The movable blade is provided with two horizontal baffles which are arranged at intervals up and down, and an accommodation space for accommodating the toggle rod is formed between the two horizontal baffles.

[0033] Furthermore, the toggle rod is a curved rod;

[0034] The free end of the toggle rod is located in the accommodating space, and the other end is connected to the driving motor.

[0035] The beneficial effects of the present invention are as follows: the present invention first sends the lettuce to be bundled into the containing cavity, and then pushes it to the rotating ring through the pushing plate, and can wrap the tape through the adsorption component and the cutting component, and finally send the bundled lettuce out through the pushing plate, so as to realize the continuous operation of lettuce bundling, avoid lettuce accumulation, and improve the bundling and harvesting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural schematic diagram of a lettuce bundling mechanism according to an embodiment of the present invention;

[0037] Figure 2 A schematic structural diagram of a lettuce bundling mechanism according to an embodiment of the present invention from another perspective;

[0038] Figure 3 It is a rear view structural schematic diagram of a lettuce bundling mechanism according to an embodiment of the present invention;

[0039] Figure 4 This is a structural schematic diagram of a lettuce harvester according to an embodiment of the present invention;

[0040] Figure 5 This is a structural schematic diagram of a lettuce harvester from another perspective according to an embodiment of the present invention;

[0041] Figure 6 It is a structural schematic diagram of a leaf removal mechanism in an embodiment of the present invention;

[0042] Figure 7 Schematic diagram of driving the leaf removal mechanism in an embodiment of the present invention.

[0043] Including: 100. Front frame;

[0044] 200. Rear frame;

[0045] 300. Topping mechanism;

[0046] 400. Root cutting mechanism;

[0047] 500. Transmission mechanism; 510. Transmission belt group; 511. Transmission belt; 520. Transmission channel;

[0048] 600. Leaf removing mechanism; 610. Fixed blade; 611. First strip-shaped hole; 612. Rear limit plate; 613. Front limit plate; 620. Movable blade; 621. Second strip-shaped hole; 622. Front baffle; 623. Cross baffle; 624. Accommodating space; 625. Poking rod; 626. Driving motor;

[0049] 710. Accommodating cavity; 720. Pushing plate; 730. Rotating ring; 740. Placing post; 750. Suction cup; 760. Cutting blade. Detailed implementation mode

[0050] The present invention will be described in detail below in conjunction with the drawings and the specific implementation mode.

[0051] The present invention discloses a lettuce bundling mechanism. As Figure 1 , Figure 2 and Figure 3 shown, it includes an accommodating cavity 710 for accommodating the lettuce to be bundled, and the top of the accommodating cavity 710 is open; a rotating ring 730 is arranged behind the accommodating cavity 710, and a placing post 740 for placing the tape is fixedly arranged on the front end face of the rotating ring 730; an adsorption assembly and a cutting assembly are also arranged on the side of the rotating ring 730; a pushing plate 720 that can move along the front and back direction of the accommodating cavity 710 is arranged above the accommodating cavity 710; wherein, when the pushing plate 720 is in the first predetermined position, the rotating ring 730 rotates to bundle the lettuce to be bundled; when the pushing plate 720 moves from the first predetermined position to the second predetermined position, the bundled lettuce is sent out from the rotating ring 730 to the outside.

[0052] The present invention first sends the lettuce to be bundled into the accommodating cavity 710, and then pushes it to the rotating ring 730 through the pushing plate 720. The tape can be wound through the adsorption assembly and the cutting assembly, and finally the bundled lettuce is sent out through the pushing plate 720, which can realize the continuous operation of lettuce bundling, avoid the accumulation of lettuce, and improve the bundling and harvesting efficiency.

[0053] In the present invention, a plurality of arc-shaped rods are arranged at intervals in the front-rear direction, and an arc-shaped plate is laid on these arc-shaped rods. The axis of the arc-shaped plate is arranged in the front-rear direction to facilitate the transportation of lettuce. The angle of the arc-shaped plate can be 90°, 180°, etc. Specifically, a 90° arc-shaped plate is adopted in this embodiment. Then, a vertical plate is added to the bottom edge of the arc-shaped plate. The cavity formed by the vertical plate and the arc-shaped plate is the accommodating cavity 710. Since the processed lettuce falls from above into the accommodating cavity 710, its top is open. Moreover, in order to cooperate with the movement of the push plate 720, the front-rear direction of the accommodating cavity 710 is also open.

[0054] It should be noted that in the present invention, the direction in which the harvester advances during operation is defined as the front. Thus, the direction relative to the front is the rear. Since the bundling mechanism is used to perform the last process of the entire lettuce harvesting, it is installed on the rear frame 200, and the converter 730 is located behind the accommodating cavity 710.

[0055] More specifically, a threaded lead screw running in the front-rear direction is further arranged on the rear frame 200. A moving member is installed on the threaded lead screw. The moving member includes a motor and a nut. The motor drives the nut to rotate, thereby driving the moving member to move in the front-rear direction. At the same time, the push plate 720 is fixedly installed on the moving member, which can drive the push plate 720 to move back and forth, so as to push the lettuce to be bundled falling into the accommodating cavity 710 to move backward.

[0056] When the push plate 720 moves to the first predetermined position, a part of the lettuce is located behind the rotating ring 730, and the other part is still in the accommodating cavity 710. Of course, the weight of the lettuce in the accommodating cavity 710 will be greater than the weight of the lettuce behind the rotating ring 730, so as to ensure that the lettuce will not fall. At this time, the adsorption assembly, the cutting assembly and the rotating ring 730 start to operate to bundle the lettuce.

[0057] The placing pile 740 is rod-shaped and is perpendicularly arranged with respect to the front end face of the rotating ring 730. This can ensure the winding direction of the tape so that its adhesive surface faces the lettuce.

[0058] An inner ring is embedded in the inner circle of the rotating ring 730, and the inner ring is connected to the rotating ring 730 through a rotating member. The rotating member can be a bearing. When the lettuce passes through the rotating ring 730, the design of the inner ring can avoid scratching the periphery of the lettuce caused by the rotation of the rotating ring 730.

[0059] The tape is pre-installed on the placing pile 740 and can rotate relative to the placing pile 740. It is also necessary to ensure that the tape does not fall off the placing pile 740. Therefore, a nut can be installed at the free end of the placing pile 740. When installing the tape, unscrew the nut, and then screw on the nut after the tape is installed. The nut can ensure that the tape does not fall off the placing pile 740. It should be noted that the outer circumference of the placing pile 740 and the inner circumference of the tape need to be closely matched. It is necessary to ensure that the tape can rotate and at the same time ensure that there is a certain frictional force between the two, so as to increase the force when cutting the tape later.

[0060] The adsorption assembly includes a suction cup 750, and the suction cup 750 faces the lettuce to be bundled; the suction cup 750 is connected to a vertically arranged first lead screw through a first connecting block; wherein, when the first lead screw rotates driven by a first motor, the first connecting block drives the suction cup 750 to move up and down to realize the adsorption of the free end of the tape. A slider can also be arranged on the other side of the first connecting block. At the same time, a first vertical rod is arranged beside the first lead screw. When the first connecting block moves relative to the first lead screw, the slider slides relative to the first vertical rod, so as to avoid the horizontal rotation of the first connecting block.

[0061] In addition, devices such as a pressure sensor can be installed on the edge of the suction cup 750 to detect the fitting force between the suction cup 750 and the lettuce. For example, an external pressure sensor similar in shape and size to the suction cup is connected to the support rod of the suction cup 750. When it comes into contact with the lettuce at the same time as the suction cup 750, it can sense the force received by the suction cup 750.

[0062] The cutting assembly includes a cutting blade 760, and the cutting edge direction of the cutting blade 760 faces the lettuce to be bundled; the cutting blade 760 is connected to a vertically arranged second lead screw through a second connecting block; wherein, when the second lead screw rotates driven by a second motor, the second connecting block drives the cutting blade 760 to move up and down to realize the cutting of the tape. Similarly, a slider can also be added to the second connecting block, and a second vertical rod is arranged at the corresponding position, and the two cooperate with each other to avoid the horizontal rotation of the cutting blade 760.

[0063] As a specific implementation manner, the rotating ring 730 is a gear, and the gear is connected to a third motor through a driving gear. Through this setting method, the driving structure of the rotating ring 730 can be simplified.

[0064] The suction cup 750 is used to adsorb the free end of the tape. When the push plate 720 moves to the first predetermined position, start the first motor to drive the first lead screw to rotate, so that the first connecting block drives the suction cup 750 to move towards the surface of the lettuce. When it adheres to the surface of the lettuce, the sticky side of the tape will stick to the lettuce. This sticking force does not need to be too large, just simply stick it. Then the suction cup 750 cancels the suction force, and the first motor is reversed to reset the suction cup 750.

[0065] Next, start the third motor to drive the drive gear to rotate, thereby driving the rotating ring 730 to rotate. Since the free end of the tape has been pasted to the surface of the lettuce, during the rotation of the rotating ring 730, the tape also rotates on its own axis, thus winding around the surface of the lettuce to be baled for several turns until reaching the predetermined number of turns. At this time, the third motor stops working. Then, start the first motor to make the suction cup 750 adsorb to the tape wound around the lettuce.

[0066] Then, start the second motor. The second connecting block drives the cutting blade 760 to move downward until the tape between the rotating ring 730 and the suction cup 750 is cut off. The second motor rotates in the reverse direction to reset the cutting blade 760, and the first motor rotates in the reverse direction to make the suction cup 750 drive the free end of the tape to reset. At this time, the lettuce baling is completed.

[0067] Finally, start the motor on the moving member to drive the push plate 720 to continue moving backward until the weight of the lettuce behind the rotating ring 730 exceeds the weight of the lettuce in front of it. The baled lettuce falls from the rotating ring 730 into the lettuce field. Then, the motor on the moving member rotates in the reverse direction to drive the push plate to reset, completing one baling process.

[0068] It should be noted that during the baling process, it is necessary to control the working time of each motor and ensure that the baling time is less than the time difference between the falling of two lettuces into the receiving cavity 710.

[0069] In addition, lubricating pads and other components can also be laid on the inner circumference of the arc-shaped plate and the inner ring to prevent the lettuce from being damaged during the process of being pushed.

[0070] The present invention also discloses a lettuce harvester, as Figure 4 and Figure 5 shown, which includes the above-mentioned lettuce baling mechanism; a lettuce baling mechanism is installed on the rear frame 200, and the rear frame 200 is also connected to the front frame 100. A topping mechanism 300, a root cutting mechanism 400, a transmission mechanism 500, and a leaf removing mechanism 600 are respectively installed on the front frame 100; wherein, tires are installed at the bottoms of both the front frame 100 and the rear frame 200.

[0071] By driving the tires to rotate, the entire device can move forward, and the direction of the harvester can be adjusted by controlling the direction of the tires. Specifically, two tires are provided at the front end of the front frame 100, and two tires are provided at both the front and rear ends of the rear frame 200, thereby realizing the support, movement, and steering of the entire cutting machine frame. The rear end of the front frame 100 is fixedly connected to the rear frame.

[0072] The front frame 100 is provided with a lettuce transmission channel 520 running from front to back. The lettuce transmission channel 520 is a continuous channel in the middle of the front frame 100, running from its front end to the back end, through which lettuce can be transmitted. It should be noted that this channel is vertical, that is, the lettuce moves vertically in it; the transmission mechanism 500 includes several groups of transmission belt groups 510; the transmission belt group 510 includes transmission belts 511 respectively arranged in the transmission channel 520, and the surface of the transmission belt 511 faces the transmission channel 520; among them, the distance between the corresponding transmission belts 511 on both sides in the transmission belt group 510 is less than a predetermined distance, and this predetermined distance is determined according to the diameter of the lettuce to ensure that the lettuce will not fall during transmission.

[0073] The front frame 100 is mainly used to realize the operations of root cutting, top removal, transmission, and leaf removal of lettuce. Regarding the root cutting process of lettuce, the root cutting mechanism 400 includes a horizontal cutting blade installed at the bottom of the front end of the front frame 100, and the cutting blade is driven by a motor. When the cutting machine is moving, the cutting blade rotates at a high speed to cut the contact part between the lettuce and the ground.

[0074] In one embodiment, there may be two cutting blades, and the two cutting blades are arranged staggered up and down, and the bottom surface height of the upper cutting blade is equal to the top surface height of the lower cutting blade.

[0075] At the top of the front end of the front frame 100, at a certain height above the root cutting mechanism 400, a top removal mechanism 300 is also provided. The top removal mechanism 300 is a horizontal runner, and the runner is driven to rotate by another motor. The scraper on the outer periphery of the runner knocks off the flowering part at the top of the lettuce when rotating.

[0076] After the above-mentioned root cutting and top removal, the lettuce is transported to the bundling mechanism at the rear by the driving of the transmission mechanism 500. Specifically, the lettuce after root cutting and top removal moves backward under the driving of the first group of transmission belt groups 510 in the front. As Figure 5 shown, the first group of transmission belt groups 510 includes two transmission belts 511, and the two transmission belts 511 clamp the vertical lettuce, and the lettuce moves backward under the driving of the transmission belt 511. In addition, it should be noted that the running speeds of the two transmission belts 511 in the transmission belt group 510 are different, one is fast and the other is slow. In this way, the lettuce will rotate during the backward movement, so as to facilitate the cutting of the leaves on the circumference of the lettuce.

[0077] In the embodiment of the present invention, as Figure 4As shown, the frontmost transmission belt group 510 is located at the upper and lower parts of the front frame 100, the next transmission belt group is located at the middle part of the front frame 100, the next transmission belt group is located at the upper and lower parts, and the last transmission belt group 510 is located at the middle height of the front frame 100. Through such an arrangement, different parts of the lettuce can be alternately clamped and transported to prevent a certain part of the lettuce from being damaged by clamping for a long time. Moreover, through the clamping movement of different parts, the position of the lettuce can also be prevented from being deviated.

[0078] In one embodiment, Figure 6 As shown, the leaf removal mechanism 600 includes a cutting blade group arranged on the front frame body 100; the cutting blade group includes a fixed blade 610 and a movable blade 620; the fixed blade 610 is plate-shaped and its side faces the transmission channel 520, and its front end is provided with a plurality of first strip holes 611 backward, and the plurality of first strip holes 611 are arranged at intervals up and down; the movable blade 620 is plate-shaped and its side faces the transmission channel 520, and its front end is provided with a plurality of second strip holes 621 backward, and the plurality of second strip holes 621 are arranged at intervals up and down The fixed blade 610 is provided with a rear limit plate 612 and a front limit plate 613 arranged in the up-down direction; the upper and lower ends of the movable blade 620 are respectively provided with front baffle plates 622 in the up-down direction; the rear end of the movable blade 620 is fitted with the front end of the rear limit plate 612, and the front end of the front baffle plate 622 is fitted with the rear end of the front limit plate 613; the movable blade 620 is provided with two horizontal baffle plates 623 arranged at intervals in the up-down direction, and a receiving space 624 for receiving the toggle rod 625 is formed between the two horizontal baffle plates 623.

[0079] The leaf removal mechanism 600 of the present invention adopts a blunt knife design, which fits tightly. It can peel off the leaves while avoiding damage to the pulp; the layered design ensures the smoothness of the stem. Figure 4 As shown, the arrangement direction of the fixed blade 610 and the movable blade 620 is consistent with the arrangement direction of the belt. However, the heights of the leaf removing mechanism 600 and the transmission belt set 510 on the front frame 100 are different.

[0080] In one embodiment, Figure 7 As shown, the toggle rod 625 is a bent rod. Through the design of the bent rod, during the rotation of the toggle rod 625, the movement trajectory of its free end will form a circle, so that the toggle rod will toggle the movable blade 610 up and down. The free end of the toggle rod 625 is located in the accommodating space 624, and the other end is connected to the drive motor 626.

[0081] When the lettuce moves along with the driving belt 511, the leaves of the lettuce will be inserted into the first strip-shaped hole 611 and the second strip-shaped hole 621 facing forward. At this time, the driving motor 626 operates to drive the toggle rod 625 to rotate. During the rotation of the toggle rod 625, interference will occur with the transverse baffle 624. Since the moving blade 610 can move up and down in the space enclosed by the rear limit plate 612 and the front limit plate 613, when the moving blade 610 moves up and down, the leaves in the first strip-shaped hole 611 and the second strip-shaped hole 612 will be broken by the plate body of the blade, thus realizing defoliation with a blunt knife.

[0082] In addition, a conveyor belt for transporting the defoliated lettuce is further provided between the front frame body 100 and the rear frame body 200. This conveyor belt can drive the lettuce to move back and forth in the horizontal direction. Its front end is located at the rear end of the front frame body 100 and is used to receive the lettuce conveyed out from the transmission channel 520. The rear end of the conveyor belt is located above the accommodation cavity 710. When the lettuce falls from the conveyor belt, it just falls into the accommodation cavity 710.

[0083] In one embodiment, a counting device can also be installed on the cutting machine to automatically start the bundling mechanism after a certain number of cut lettuces, increasing the automation degree of the device.

Claims

1. A lettuce bundling mechanism, characterized in that, It includes a receiving cavity (710) for accommodating the lettuce to be bundled, and the top of the receiving cavity (710) is open. A swivel ring (730) is provided at the rear of the receiving cavity (710), and a placement post (740) for placing the tape is fixedly provided on the front end face of the swivel ring (730). An adsorption assembly and a cutting assembly are also provided on the side of the swivel ring (730). A push plate (720) that can move in the front-back direction of the receiving cavity (710) is provided above the receiving cavity (710); wherein, when the push plate (720) is at the first predetermined position, the swivel ring (730) rotates to bundle the lettuce to be bundled; when the push plate (720) moves from the first predetermined position to the second predetermined position, the bundled lettuce is sent out of the swivel ring (730) to the outside.

2. The lettuce bundling mechanism according to claim 1, characterized in that, An inner ring is embedded in the inner circle of the swivel ring (730), and the inner ring is connected to the swivel ring (730) through a rotating member.

3. The tying mechanism for asparagus lettuce according to claim 2, characterized in that, The placement post (740) is rod-shaped and is perpendicularly arranged with respect to the front end face of the swivel ring (730).

4. The tying mechanism for asparagus lettuce according to claim 3, characterized in that, The adsorption assembly includes a suction cup (750), and the suction cup (750) faces the lettuce to be bundled. The suction cup (750) is connected to a vertically arranged first lead screw through a first connecting block. Wherein, when the first lead screw rotates driven by a first motor, the first connecting block drives the suction cup (750) to move up and down to realize the adsorption of the free end of the tape.

5. The tying mechanism for lettuce as claimed in claim 3, wherein, The cutting assembly includes a cutting blade (760), and the cutting edge direction of the cutting blade (760) faces the lettuce to be bundled. The cutting blade (760) is connected to a vertically arranged second lead screw through a second connecting block. Wherein, when the second lead screw rotates driven by a second motor, the second connecting block drives the cutting blade (760) to move up and down to realize the cutting of the tape.

6. A lettuce bundling mechanism and a lettuce harvester according to any one of claims 3-5, characterized in that, The swivel ring (730) is a gear, and the gear is connected to a third motor through a driving gear.

7. A lettuce harvester, characterized in that, It includes a lettuce bundling mechanism according to any one of claims 1-6. The lettuce bundling mechanism is installed on a rear frame body (200), and the rear frame body (200) is further connected to a front frame body (100). A topping mechanism (300), a root cutting mechanism (400), a transmission mechanism (500) and a leaf removing mechanism (600) are respectively installed on the front frame body (100). Wherein, tires are installed at the bottoms of both the front frame body (100) and the rear frame body (200).

8. The tying mechanism for lettuce and the lettuce harvester according to claim 7, characterized in that, A lettuce transmission channel (520) running in the front-back direction is provided on the front frame body (100). The transmission mechanism (500) includes a plurality of groups of transmission belt groups (510). The transmission belt group (510) includes transmission belts (511) respectively arranged in the transmission channel (520), and the surface of the transmission belt (511) faces the transmission channel (520); wherein, the distance between the transmission belts (511) corresponding to both sides in the transmission belt group (510) is less than a predetermined distance.

9. The tying mechanism for asparagus lettuce and the asparagus lettuce harvester according to claim 7, characterized in that, The leaf removing mechanism (600) includes a cutting blade group provided on the front frame body (100). The cutting blade group includes a fixed blade (610) and a moving blade (620); The fixed blade (610) is plate-shaped and its side faces the transfer channel (520). A plurality of first strip-shaped holes (611) are formed at the front end thereof and open backward. The plurality of first strip-shaped holes (611) are arranged at intervals in the vertical direction; The moving blade (620) is plate-shaped and its side faces the transfer channel (520). A plurality of second strip-shaped holes (621) are formed at the front end thereof and open backward. The plurality of second strip-shaped holes (621) are arranged at intervals in the vertical direction; The fixed blade (610) is provided with a rear limiting plate (612) and a front limiting plate (613) arranged in the vertical direction; Upper and lower front baffle plates (622) in the vertical direction are respectively arranged at the upper and lower ends of the moving blade (620); The rear end of the moving blade (620) is attached to the front end of the rear limiting plate (612), and the front end of the front baffle plate (622) is attached to the rear end of the front limiting plate (613); Two transverse baffle plates (623) arranged at intervals in the vertical direction are provided on the moving blade (620), and a receiving space (624) for receiving a toggle rod (625) is formed between the two transverse baffle plates (623).

10. The lettuce bundling mechanism and the lettuce harvester according to claim 9, characterized in that, The toggle rod (625) is a bent rod; The free end of the toggle rod (625) is located in the receiving space (624), and the other end is connected to a driving motor.

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