Fresh leaf tea harvester

Abstract

A fresh leaf tea harvester comprises a collecting box, a mounting frame, a reciprocating cutter assembly, a movable cutter, a cutting force adjusting assembly and a broach assembly, the mounting frame is arranged in the collecting box, the reciprocating cutter assembly is movably mounted on the mounting frame, the movable cutter is movably mounted on the mounting frame, and the movable cutter and a cutting part of the reciprocating cutter assembly are distributed in a zigzag shape; wherein the cutting force adjusting assembly is movably installed on the installation frame, the execution tail ends of the cutting force adjusting assembly are distributed on the two sides of the installation portion of the movable cutting knife, and the execution tail ends of the cutting force adjusting assembly are matched with the movable cutting knife to be used for adjusting the maximum cutting force; the broach assemblies are arranged on the mounting frame and distributed on the two sides of the mounting part of the movable cutting knife; the broach assembly comprises a displacement amplification assembly, a reset spring, a magnet and a magnetism isolation assembly. The maximum cutting force of the harvester can be adjusted by arranging the cutting force adjusting assembly, the saw-tooth-shaped cutting knife and the movable cutting knife are prevented from continuously applying cutting force to the tea stems through the knife pulling assembly, and then it is guaranteed that the harvester cannot cause continuous damage to the tea stems.

Description

Technical Field

[0001] The present invention relates to the technical field of tea leaf harvesting, and particularly to a fresh leaf tea harvester. Background Art

[0002] Bulk tea refers to tea varieties with large production, frequent trading and representativeness in the tea market. These teas usually have high economic value and have a significant impact on the tea market. The types of bulk tea include green tea, black tea, Pu-erh tea, oolong tea, etc., which dominate the production and trading of tea. Bulk tea is characterized by stable quality and reasonable price, and can meet the needs of the majority of consumers. Since the required quality of bulk tea is not very high, generally a reciprocating cutter is used for harvesting during harvesting. Existing reciprocating cutters include double-action blade reciprocating cutters, single-action blade reciprocating cutters, flat reciprocating cutters, arc reciprocating cutters, etc. At present, no matter which form of reciprocating cutter is used, it can only achieve one cut, cutting both old leaves and tender buds, increasing the workload of sorting old leaves and tender buds in the later stage. A selective fresh tea leaf cutter is proposed to solve the above problems.

[0003] The publication number CN201110271156.X discloses a tea harvester, including a cutter. Two blades are oppositely arranged on the cutter. It is characterized in that: one of the blades is a fixed blade and is serrated, and the other blade is a moving blade composed of independent triangular cutting edges. The triangular cutting edges are movably arranged on the tool rest and can displace by different amounts according to the magnitude of the resistance received.

[0004] Although the above-mentioned prior art can adjust the cutting force by setting an adjusting spring, as the blade moves, the compression amount of the spring increases, and then the reaction force on the tea stalk increases, so the tea stalk will still be damaged, and old leaves and tender buds are sorted during cutting. Summary of the Invention

[0005] The purpose of the present invention is to provide a fresh leaf tea harvester to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A fresh leaf tea harvester includes a material receiving box, a mounting frame, a reciprocating cutter assembly, a movable cutter, a cutting force adjustment assembly and a draw blade assembly. The mounting frame is arranged in the material receiving box. The reciprocating cutter assembly is movably installed on the mounting frame. The movable cutter is movably installed on the mounting frame and is distributed in a serrated shape with the cutting part of the reciprocating cutter assembly. Among them:

[0008] The cutting force adjustment assembly is movably mounted on the mounting frame, and the execution ends are distributed on both sides of the mounting part of the movable cutter. The execution ends of the cutting force adjustment assembly cooperate with the movable cutter to adjust the maximum cutting force;

[0009] The broaching component is arranged on the mounting frame and distributed on both sides of the mounting part of the movable cutter;

[0010] The broaching component includes a displacement amplification component, a return spring, a magnet and a magnetic isolation component. The action end of the displacement amplification component is arranged on the side surface of the mounting part of the movable cutter. The displacement amplification component can perform linear motion, and its execution end is connected with the mounting frame through the return spring. The two magnets are arranged oppositely with opposite magnetic poles. One magnet is arranged on the side surface of the mounting part of the movable cutter, and the other is arranged on the mounting frame. The magnetic isolation component is movably mounted on the mounting frame. The action end of the magnetic isolation component cooperates with the execution end of the displacement amplification component, and the magnetic isolation part of the magnetic isolation component cooperates with the magnet arranged on the mounting frame.

[0011] Preferably, the cutting force adjustment assembly includes a movable plate, a spring, a connecting plate and a tightening bolt. The movable plate is movably fitted in the guide groove arranged in the mounting frame. Both sides of the movable cutter are connected with the movable plate through springs. The two connecting plates are movably mounted on the mounting frame. The movable plate on the same side of the mounting part of the movable cutter is fixedly connected with one of the connecting plates. The tightening bolt is rotatably mounted on the mounting frame and is in threaded cooperation with the side surface of the connecting plate.

[0012] Preferably, the displacement amplification component includes a hollow sleeve, a piston rod and a telescopic rod. The inner diameters of both ends of the hollow sleeve are different. Piston rods are movably fitted inside both ends of the hollow sleeve. A medium is filled between the two piston rods. A telescopic rod is arranged inside the piston rod at the end with a larger inner diameter of the hollow sleeve. The telescopic rod is connected with the side surface of the mounting part of the movable cutter. The piston rod at the end with a smaller inner diameter of the hollow sleeve is connected with the return spring.

[0013] Preferably, the magnetic isolation component includes a magnetic isolation plate and a direction-changing component. The magnetic isolation plate is movably fitted on the mounting frame and faces the magnet arranged on the mounting frame at the magnetic isolation end. The action end of the magnetic isolation plate is fitted inside the execution end of the direction-changing component.

[0014] Preferably, the direction-changing component includes a rotating sleeve, a direction-changing guide groove and a blocking part. The rotating sleeve is rotatably mounted on the side surface of the piston rod at the end with a larger inner diameter of the hollow sleeve. The rotating sleeve is provided with a direction-changing guide groove. The action end of the magnetic isolation plate is fitted inside the direction-changing guide groove. A blocking part for restricting the rotation direction of the rotating sleeve is arranged at the direction-changing position in the direction-changing guide groove.

[0015] Preferably, the reciprocating cutter assembly includes a serrated cutter, an eccentric wheel, a connecting rod and a motor. The serrated cutter is movably fitted on the mounting frame, and the end is in end cooperation with the eccentric wheel through the connecting rod. The eccentric wheel is rotatably mounted on the mounting frame and is power-connected to the motor.

[0016] Preferably, a limiting stop block is provided inside the end with a smaller inner diameter of the hollow sleeve.

[0017] Preferably, the variable guide groove is a return groove, the variable guide groove is lower at the top and higher at the bottom, an arc groove for descending is provided on the left side of the variable guide groove, and an arc groove for ascending is provided on the right side. Blocking parts are provided in both arc grooves.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] A fresh leaf tea harvester disclosed by the present invention can adjust the maximum cutting force of the harvester by setting a cutting force adjustment component during operation, so that the harvester can only cut tea leaves without cutting the tea stalks, avoiding damage to the tea trees.

[0020] Furthermore, by setting a displacement amplification component, the small displacement of the movable cutter can be amplified into a larger displacement. Then, through the magnetic isolation component, the magnetic isolation between the two magnets is released. Under the magnetic force of the magnets, the movable cutter can be pulled away from the tea stalk, so that the movable cutter will no longer squeeze the tea stalk, avoiding the serrated cutter and the movable cutter from continuously applying a cutting force to the tea stalk, and thus ensuring that the harvester will not cause continuous damage to the tea stalk.

[0021] Moreover, under the action of the variable guide groove, the return spring and the spring, the movable cutter can follow the serrated cutter to reset, thus not affecting the next cutting of the harvester. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a three-dimensional schematic diagram of the reciprocating cutter assembly in the present invention;

[0024] Figure 3 is a partial three-dimensional schematic diagram of the cutting force adjustment component in the present invention;

[0025] Figure 4 is the front view of the broaching component in the present invention;

[0026] Figure 5 is Figure 4 schematic diagram of part A in

[0027] Figure 6 is the internal schematic diagram of the displacement amplification component;

[0028] Figure 7 It is a three-dimensional schematic diagram of a variable guide groove.

[0029] In the figure: 1 is a material receiving box, 2 is a mounting frame, 3 is a reciprocating cutter assembly, 4 is a movable cutter, 5 is a cutting force adjustment assembly, 6 is a broaching assembly, 31 is a serrated cutter, 32 is an eccentric wheel, 33 is a connecting rod, 34 is a motor, 51 is a movable plate, 52 is a spring, 53 is a connecting plate, 54 is a tightening bolt, 61 is a displacement amplification assembly, 62 is a return spring, 63 is a magnet, 64 is a magnetic isolation assembly, 611 is a hollow sleeve, 612 is a piston rod, 613 is a telescopic rod, 641 is a magnetic isolation plate, 642 is a direction-changing assembly, 6421 is a rotating sleeve, 6422 is a variable guide groove, 6423 is a blocking portion. Specific implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment:

[0032] Please refer to Figures 1 to 7 , the present invention provides a technical solution:

[0033] A fresh leaf tea harvester includes a material receiving box 1, a mounting frame 2, a reciprocating cutter assembly 3, a movable cutter 4, a cutting force adjustment assembly 5 and a broaching assembly 6. The material receiving box 1 is used for collecting the cut tea leaves. The mounting frame 2 is detachably arranged in the material receiving box 1. The reciprocating cutter assembly 3 is horizontally movably installed on the mounting frame 2 and is used for cutting tea leaves. A plurality of movable cutters 4 are horizontally movably installed on the mounting frame 2 and are distributed in a serrated shape with the cutting part of the reciprocating cutter assembly 3. Among them:

[0034] The cutting force adjustment assembly 5 is movably installed on the mounting frame 2, and the execution ends are distributed on both sides of the installation part of the movable cutter 4. The execution ends of the cutting force adjustment assembly 5 cooperate with the movable cutter 4 to adjust the maximum cutting force;

[0035] The broaching assembly 6 is arranged on the mounting frame 2 and is distributed on both sides of the installation part of the movable cutter 4;

[0036] Please refer to Figure 4 , Figure 5 and Figure 6, the broach assembly 6 includes a displacement amplification assembly 61, a return spring 62, a magnet 63 and a magnetic isolation assembly 64. The action end of the displacement amplification assembly 61 is provided on the side of the installation part of the movable cutter 4. The displacement amplification assembly 61 can achieve linear motion, and its execution end is connected to the mounting bracket 2 through the return spring 62. The displacement amplification assembly 61 can output a small displacement of the action end as a large displacement of the execution end. The two magnets 63 are arranged oppositely with opposite magnetic poles. One of the magnets 63 is fixedly installed on the side of the installation part of the movable cutter 4, and the other is arranged on the mounting bracket 2. The magnetic isolation assembly 64 is movably installed on the mounting bracket 2. The action end of the magnetic isolation assembly 64 cooperates with the execution end provided on the displacement amplification assembly 61, and the magnetic isolation part of the magnetic isolation assembly 64 cooperates with the magnet 63 provided on the mounting bracket 2.

[0037] Please refer to Figure 2 and Figure 3 , as a preferred embodiment, the cutting force adjustment assembly 5 includes a movable plate 51, a spring 52, a connecting plate 53 and a tightening bolt 54. The movable plate 51 is horizontally movably fitted in the guide groove provided in the mounting bracket 2. The movable plate 51 forms a linear motion pair in the guide groove provided in the mounting bracket 2. Both sides of the movable cutter 4 are respectively connected to the movable plate 51 through the spring 52. The movable plate 51 moves closer to or away from the side of the movable cutter 4, thereby realizing the adjustment of the compression amount of the spring 52, and finally achieving the purpose of changing the elastic force of the spring 52. When the movable cutter 4 cuts tea leaves, it will squeeze the spring 52. Therefore, the elastic force of the spring 52 is the maximum cutting force. When the maximum cutting force required for cutting tea leaves is greater than the elastic force of the spring 52, the movable cutter 4 will have a small displacement. The two connecting plates 53 are horizontally movably installed on the mounting bracket 2 and are arranged on both sides of the mounting bracket 2. The movable plate 51 on the same side of the installation part of the movable cutter 4 is fixedly connected to one of the connecting plates 53. The connecting plate 53 connects the movable plates 51 on the same side of the installation part of the movable cutter 4 in series. Pushing the connecting plate 53 can push all the movable plates 51 on the same side of the installation part of the movable cutter 4, and then adjust the compression amount of the spring 52. The tightening bolt 54 is rotatably installed on the mounting bracket 2 and is in threaded cooperation with the side of the connecting plate 53. Rotating the tightening bolt 54 can drive the connecting plate 53 to have a horizontal displacement.

[0038] Please refer to Figure 4 and Figure 6, As a preferred embodiment, the displacement amplification component 61 includes a hollow sleeve 611, a piston rod 612, and a telescopic rod 613. The inner diameters of both ends of the hollow sleeve 611 are different. The piston rods 612 are movably fitted inside both ends of the hollow sleeve 611. A medium is filled between the two piston rods 612. When the piston rod 612 at the end with a larger inner diameter of the hollow sleeve 611 moves towards the piston rod 612 at the end with a smaller inner diameter of the hollow sleeve 611, the small displacement of the piston rod 612 at the end with a larger inner diameter of the hollow sleeve 611 will push the medium between the two piston rods 612 towards the end with a smaller inner diameter of the hollow sleeve 611. Due to the different inner diameters of the two ends, the volumes of the medium at both ends are different. Consequently, the small displacement of the piston rod 612 at the end with a larger inner diameter of the hollow sleeve 611 will cause the piston rod 612 at the end with a smaller inner diameter of the hollow sleeve 611 to have a larger displacement. A telescopic rod 613 is provided inside the piston rod 612 at the end with a larger inner diameter of the hollow sleeve 611. The telescopic rod 613 is connected to the side of the mounting portion of the movable cutter 4. When the movable cutter 4 moves towards one side, the movable cutter 4 will pull the telescopic rod 613 to extend. The telescopic rod 613 adopts multi-stage telescoping, so that the extension amount of the telescopic rod 613 can match the displacement amount of the movable cutter 4. Consequently, the movement of the movable cutter 4 will not interfere with the movement of the piston rod 612 on the other side of the movable cutter 4. The piston rod 612 at the end with a smaller inner diameter of the hollow sleeve 611 is connected to the return spring 62.

[0039] , As a preferred embodiment, the magnetic isolation component 64 includes a magnetic isolation plate 641 and a direction-changing component 642. The magnetic isolation plate 641 is vertically movably fitted on the mounting frame 2 and faces the magnet 63 provided on the mounting frame 2 at the magnetic isolation end. When the magnetic isolation plate 641 faces the magnet 63 on the mounting frame 2, it can isolate the magnetic induction lines between the two magnets 63. When the magnetic isolation plate 641 leaves the magnet 63 on the mounting frame 2, under the magnetic force of the two magnets 63, it can pull the movable cutter 4 towards the magnet 63 provided on the mounting frame 2. The action end of the magnetic isolation plate 641 is fitted inside the execution end of the direction-changing component 642.

[0040] , As a preferred embodiment, the magnetic isolation end of the magnetic isolation plate 641 is made of a magnetic shielding material, which can isolate magnetic induction lines. This is a conventional technical means for those skilled in the art, and the principle and scheme will not be elaborated here.

[0041] As a preferred embodiment, the direction-changing component 642 includes a rotating sleeve 6421, a direction-changing guide groove 6422, and a blocking portion 6423. The rotating sleeve 6421 is rotatably mounted on the side surface of the piston rod 612 at the larger-diameter end of the inner diameter of the hollow sleeve 611. A direction-changing guide groove 6422 is formed in the rotating sleeve 6421. The acting end of the magnetic isolation plate 641 is fitted inside the direction-changing guide groove 6422. When the piston rod 612 moves towards the return spring 62, the rotating sleeve 6421 also moves along with the piston rod 612. Then, under the action of the direction-changing guide groove 6422, the magnetic isolation plate 641 is driven to undergo a vertical displacement. A blocking portion 6423 for restricting the rotation direction of the rotating sleeve 6421 is provided at the direction-changing portion in the direction-changing guide groove 6422. By providing the blocking portion 6423, the reverse rotation of the rotating sleeve 6421 is avoided.

[0042] As a preferred embodiment, the reciprocating cutter assembly 3 includes a serrated cutter 31, an eccentric wheel 32, a connecting rod 33, and a motor 34. The serrated cutter 31 is movably fitted on the mounting frame 2, and the end thereof is in end cooperation with the eccentric wheel 32 through the connecting rod 33. The eccentric wheel 32 is rotatably mounted on the mounting frame 2 and is power-connected to the motor 34. The rotation of the eccentric wheel 32 drives the serrated cutter 31 to perform a reciprocating motion on the mounting frame 2, and then cooperate with the movable cutter 4 to achieve the purpose of cutting tea leaves.

[0043] As a preferred embodiment, a limiting block is provided inside the smaller-diameter end of the hollow sleeve 611 to prevent the piston rod 612 at the smaller-diameter end of the hollow sleeve 611 from moving to the larger-diameter end of the hollow sleeve 611.

[0044] As a preferred embodiment, please refer to Figure 6 and Figure 7, the variable guide groove 6422 becomes a loop groove, the variable guide groove 6422 is lower at the top and higher at the bottom. An arc groove that descends is provided on the left side of the variable guide groove, and an arc groove that ascends is provided on the right side. At both ends where the two arc grooves are connected, a horizontal groove is provided at one end, and the upper and lower horizontal grooves are lower at the top and higher at the bottom. When the piston rod 612 moves towards the return spring 62, the rotating sleeve 6421 will also move along with the piston rod 612. At this time, under the action of the ascending arc groove, the magnetic isolation plate 641 moves upward, and then the magnetic isolation part of the magnetic isolation plate 641 leaves the magnet 63 on the mounting bracket 2. Under the magnetic force of the two magnets 63, the movable cutter 4 is pulled towards the magnet 63 provided on the mounting bracket 2. At this time, the movable cutter 4 will also drive the piston rod 612 to continue to compress the return spring 62 through the displacement amplification assembly 61. When the action end of the magnetic isolation plate 641 moves into the descending arc groove, under the action of the descending arc groove, the magnetic isolation plate 641 can be directly opposite to the magnet 63 and then isolate the magnetic induction lines. At this time, the serrated cutter 31 will also move away from the movable cutter 4. Then, under the elastic force of the spring 52, the movable cutter 4 will be driven to reset, and at the same time, the displacement amplification assembly 61 will also reset under the elastic force of the return spring 62. A blocking part 6423 is provided in both arc grooves. When the action end of the magnetic isolation plate 641 moves in the arc groove, the rotating sleeve 6421 will rotate to a certain extent. By setting the blocking part 6423, when the rotating sleeve 6421 rotates, the action end of the magnetic isolation plate 641 will only rise in the ascending arc groove and will not descend, and the action end of the magnetic isolation plate 641 in the descending arc groove will only descend. Then, when the movable cutter 4 is reset, there will be no movement interference with the magnetic isolation action of the magnetic isolation plate 641.

[0045] Working principle of the present invention:

[0046] When this device is in use, since the hardness of tender tea is lower than that of tea stalks, it is necessary to adjust the maximum cutting force of the movable cutter 4 so that the maximum cutting force of the movable cutter 4 is greater than the force required to cut tender tea. At the same time, it is necessary to avoid cutting the tea stalks, so the maximum cutting force also needs to be smaller than the force required to cut the tea stalks. Therefore, first rotate the tightening bolt 54 to drive the connecting plate 53, and then adjust the elastic force of the spring 52 between all the movable plates 51 on the same side of the mounting part of the movable cutter 4 and the movable cutter 4. Then, through another connecting plate 53, adjust the mounting part of the movable cutter 4 on the other side of the mounting part of the movable cutter 4, and adjust the maximum cutting force for cutting tea leaves by adjusting the elastic force of the spring 52.

[0047] After the cutting force is adjusted, start the motor 34 to drive the eccentric wheel 32 to rotate. The eccentric wheel 32 drives the serrated cutter 31 to make a reciprocating motion through the connecting rod 33, so the work of cutting tea leaves can be realized.

[0048] When the harvester cuts the tea stalks, since the maximum cutting force is smaller than the force required to cut the tea stalks, the serrated cutter 31 will push the movable cutter 4 away from the tea stalks through the tea stalks. Therefore, the movable cutter 4 will push the piston rod 612 in the displacement amplification assembly 61 on one side. The displacement amplification assembly 61 will convert the small displacement of the movable cutter 4 into a larger displacement of the piston rod 612 at the other end of the displacement amplification assembly 61. At this time, the piston rod 612 will move towards the return spring 62, and the rotating sleeve 6421 will also move along with the piston rod 612. At this time, under the action of the rising arc groove, the magnetic shielding plate 641 moves upward, and then the magnetic shielding part of the magnetic shielding plate 641 leaves the magnet 63 on the mounting bracket 2. Under the magnetic force of the two magnets 63, the movable cutter 4 is pulled towards the magnet 63 provided on the mounting bracket 2. At this time, the movable cutter 4 will also drive the piston rod 612 to continue to compress the return spring 62 through the displacement amplification assembly 61. When the action end of the magnetic shielding plate 641 moves into the descending arc groove, under the action of the descending arc groove, the magnetic shielding plate 641 can face the magnet 63 to isolate the magnetic induction lines. At this time, the serrated cutter 31 will also move away from the movable cutter 4. Then, under the elastic force of the spring 52, the movable cutter 4 will be driven to reset, and at the same time, the displacement amplification assembly 61 will also reset under the elastic force of the return spring 62.

[0049] When the movable cutter 4 moves towards one side, the movable cutter 4 will pull the telescopic rod 613 to extend. The telescopic rod 613 adopts multi-stage telescoping, so that the extension amount of the telescopic rod 613 can match the displacement amount of the movable cutter 4, and then the movement of the movable cutter 4 will not interfere with the movement of the piston rod 612 on the other side of the movable cutter 4.

[0050] When the action end of the magnetic shielding plate 641 moves in the arc groove, the rotating sleeve 6421 will rotate to a certain extent. The blocking part 6423 will limit the rotation of the rotating sleeve 6421, so that the action end of the magnetic shielding plate 641 will only rise in the rising arc groove and will not descend, and the action end of the magnetic shielding plate 641 in the descending arc groove will only descend. Then, when the movable cutter 4 is reset, it will not interfere with the magnetic shielding action of the magnetic shielding plate 641.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fresh leaf tea harvester, comprising a material receiving box (1), a mounting frame (2), a reciprocating cutter assembly (3), a movable cutter (4), a cutting force adjustment assembly (5) and a broach assembly (6), wherein the mounting frame (2) is arranged in the material receiving box (1), the reciprocating cutter assembly (3) is movably mounted on the mounting frame (2), the movable cutter (4) is movably mounted on the mounting frame (2) and is zigzag-shapedly distributed with the cutting portion of the reciprocating cutter assembly (3), characterized in that: The cutting force adjustment component (5) is movably mounted on the mounting frame (2), and the execution end is distributed on both sides of the mounting portion of the movable cutting knife (4); the execution end of the cutting force adjustment component (5) cooperates with the movable cutting knife (4) to adjust the maximum cutting force; The broaching knife assembly (6) is arranged on the mounting frame (2) and distributed on both sides of the mounting portion of the movable cutting knife (4); The broach assembly (6) comprises a displacement amplification assembly (61), a reset spring (62), a magnet (63) and a magnetic shielding assembly (64). The action end of the displacement amplification assembly (61) is arranged on the side of the mounting portion of the movable cutting knife (4). The displacement amplification assembly (61) can realize linear motion. Its execution end is connected to the mounting frame (2) through the reset spring (62). The two magnets (63) are arranged opposite to each other and have opposite magnetic poles. One of the magnets (63) is arranged on the side of the mounting portion of the movable cutting knife (4) and the other is arranged on the mounting frame (2). The magnetic shielding assembly (64) is movably mounted on the mounting frame (2). The action end of the magnetic shielding assembly (64) cooperates with the execution end arranged on the displacement amplification assembly (61), and the magnetic shielding part of the magnetic shielding assembly (64) cooperates with the magnet (63) arranged on the mounting frame (2).

2. A fresh leaf tea harvester according to claim 1, characterized in that: The cutting force adjustment assembly (5) comprises a movable plate (51), a spring (52), a connecting plate (53) and a tightening bolt (54). The movable plate (51) is movably engaged in a guide groove provided in the mounting frame (2); the two sides of the movable cutting knife (4) are respectively connected to the movable plate (51) through springs (52); the two connecting plates (53) are movably mounted on the mounting frame (2); the movable plate (51) located on the same side of the mounting portion of the movable cutting knife (4) is fixedly connected to one of the connecting plates (53); the tightening bolt (54) is rotatably mounted on the mounting frame (2) and is threadedly engaged with the side surface of the connecting plate (53).

3. A fresh leaf tea harvester according to claim 2, characterized in that: The displacement amplification component (61) comprises a hollow sleeve (611), a piston rod (612) and a telescopic rod (613). The inner diameters of the two ends of the hollow sleeve (611) are different. The piston rods (612) are movably matched inside the two ends of the hollow sleeve (611). The space between the two piston rods (612) is filled with a medium. The telescopic rod (613) is arranged inside the piston rod (612) at the end with a larger inner diameter of the hollow sleeve (611). The telescopic rod (613) is connected to the side of the mounting portion of the movable cutting knife (4). The piston rod (612) at the end with a smaller inner diameter of the hollow sleeve (611) is connected to a reset spring (62).

4. A fresh leaf tea harvester according to claim 3, characterized in that: The magnetic isolation component (64) comprises a magnetic isolation plate (641) and a direction-changing component (642); the magnetic isolation plate (641) is movably mounted on the mounting frame (2) and faces the magnet (63) disposed on the mounting frame (2) at the magnetic isolation end; and the action end of the magnetic isolation plate (641) is mounted inside the execution end of the direction-changing component (642).

5. A fresh leaf tea harvester according to claim 4, characterized in that: The direction-changing assembly (642) comprises a rotating sleeve (6421), a direction-changing guide groove (6422) and a blocking portion (6423). The rotating sleeve (6421) is rotatably mounted on the side of the piston rod (612) at the end with a larger inner diameter of the hollow sleeve (611). The rotating sleeve (6421) is provided with a direction-changing guide groove (6422). The actuating end of the magnetic isolation plate (641) is fitted inside the direction-changing guide groove (6422). A blocking portion (6423) for limiting the rotation direction of the rotating sleeve (6421) is provided at the direction-changing portion inside the direction-changing guide groove (6422).

6. A fresh leaf tea harvester according to claim 4, characterized in that: The reciprocating cutter assembly (3) comprises a sawtooth cutter (31), an eccentric wheel (32), a connecting rod (33) and a motor (34); the sawtooth cutter (31) is movably fitted on the mounting frame (2) and is end-fitted with the eccentric wheel (32) through the connecting rod (33); the eccentric wheel (32) is rotatably mounted on the mounting frame (2) and is power-connected to the motor (34).

7. A fresh leaf tea harvester according to claim 5, characterized in that: A limit stopper is provided inside the end of the hollow sleeve (611) with a smaller inner diameter.

8. A fresh leaf tea harvester according to claim 5, characterized in that: The deflection guide groove (6422) is a circular groove, which is lower at the top and higher at the bottom. A descending arc groove is provided on the left side of the deflection guide groove, while an ascending arc groove is provided on the right side. Blocking parts (6423) are provided in both arc grooves.

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