A method of grading tea leaves with adjustable grading criteria

Abstract

A kind of tea harvesting grading method with adjustable grading standard, comprising: one), provide a kind of tea harvesting grading device with adjustable grading standard: including a first feeding unit and a second feeding unit, second feeding unit is located in the rear position of first feeding unit, and one-to-one correspondence, the tail end of first feeding unit is located in the upper of first collecting chamber, the tail end of second feeding unit is located in the upper of second collecting chamber, and the distance between first feeding unit and second feeding unit in vertical direction is adjusted by installation between protrusion and mounting hole;Two), device deployment;Three), tea picking;Four), tea is graded and collected.By adjusting the position of two feeding units, different tea harvesting grading standards can be set, allowing for grading tea by length during tea harvesting, reducing subsequent tea processing, efficiently and conveniently completing the process of tea harvesting and tea grading, and also allowing for strong adaptability.

Description

Technical Field

[0001] This invention relates to the field of tea, specifically to a tea harvesting and grading method with adjustable grading standards. Background Technology

[0002] The raw materials for premium teas require harvesting tea leaves that are mostly one bud and one leaf or one bud and two leaves, with specific requirements on the length of the raw materials. This necessitates that the buds and leaves be highly uniform and of moderate length during harvesting. Different grades of tea need to be harvested according to the requirements of tea processing. Traditional tea harvesting is done manually. While this allows for control over the quality of the harvested tea leaves, there are still differences between the leaves picked by each individual, making precise control impossible. Furthermore, with rising labor costs and a decreasing number of tea pickers, relying solely on manual harvesting to control tea quality is unsustainable for the long-term large-scale development of the tea industry.

[0003] Currently, most methods for grading tea leaves of different lengths involve separating them after harvesting using mechanical sieving or intelligent color sorting. Firstly, because fresh tea leaves vary in size and shape and are prone to tangling, mechanical sieving increases friction and collision between tea leaves and between the leaves and the sieve, resulting in generally unsatisfactory results. Intelligent color sorting uses color sorters, which, while effective, are very expensive and require significant additional costs for tea handling, feeding, and sorting. Existing methods for grading tea leaves of different sizes include a pull-cut type integrated harvesting and grading machine (CN114503830A). This machine utilizes the upright growth characteristic of tea buds and combines a primary and secondary conveyor structure to directly grade fresh leaves harvested at different heights on the tea tree according to length standards. Although the organization has achieved grading based on the length of tea leaves during harvesting, this method has strong limitations. It cannot adjust the grading standards and cannot meet the different requirements of different tea varieties and grades for fresh leaf harvesting. Therefore, it is essential to propose a tea harvesting and grading method with adjustable grading standards. Summary of the Invention

[0004] The purpose of this invention is to provide a tea harvesting and grading method with adjustable grading standards, which enables tea grading to be completed at the time of harvesting and has strong adaptability, so as to solve the existing technical defects and unmet technical requirements.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tea harvesting and grading method with adjustable grading standards, characterized by comprising the following steps: (i) Provides a tea harvesting and grading device with adjustable grading standards, the device comprising: The frame is equipped with a collection chamber, which includes a secondary collection chamber and a primary collection chamber. The secondary collection chamber is located above the primary collection chamber. The entrance of the primary collection chamber is located horizontally between the front end of the frame and the entrance of the secondary collection chamber. The exit of the secondary collection chamber and the exit of the primary collection chamber are staggered to the left and right at the rear end of the frame. A feeding mechanism is mounted on the frame and located in front of the collection chamber. The feeding mechanism includes at least one primary feeding unit and one secondary feeding unit. The secondary feeding unit is located above and slightly behind the primary feeding unit, and the two are in one-to-one correspondence. The tail end of the primary feeding unit is located above the primary collection chamber, and the tail end of the secondary feeding unit is located above the secondary collection chamber. All feeding units consist of at least a conveyor belt and multiple pulleys. Several protrusions are provided on the outer side of the pulleys, and several mounting holes are provided on the conveyor belt. The protrusions can be fitted with the mounting holes for installation. The conveyor belt is sleeved on the pulleys to form a loop, and the rear end of the primary feeding unit and the front end of the secondary feeding unit share a set of pulleys. A collection unit, located inside a collection chamber, is used to transport tea leaves from the entrance to the exit of the collection chamber. The cutting assembly is connected to the frame and is located below and in front of the primary feeding unit; II. Equipment Adjustment; III. Tea picking; 4) Grade and collect tea leaves.

[0006] It should be noted in this application that the protrusions on the pulley are distributed circumferentially along the outer side wall of the pulley, and are aligned in both the vertical and horizontal directions. It can be understood that a number of protrusions are distributed in a ring on the outer surface of the pulley, and the pulley is provided with several layers of such "rings".

[0007] Preferably, in step one), the adjacent primary feeding units and the secondary feeding units are symmetrically arranged; The primary feeding unit includes a first conveying component and a second conveying component, and a first conveying channel is formed between the first conveying component and the second conveying component. The first conveying channels in each primary feeding unit are parallel to each other. The secondary feeding unit includes a third conveying component and a fourth conveying component. The third conveying component is located above and behind the first conveying component, and the fourth conveying component is located above and behind the second conveying component. A second conveying channel is formed between the third and fourth conveying components, and the second conveying channels in each secondary feeding unit are parallel to each other. In the first conveying assembly, the rear end of the conveyor belt and the front end of the conveyor belt in the third conveying assembly are fitted onto a common pulley, and in the second conveying assembly, the rear end of the conveyor belt and the front end of the conveyor belt in the fourth conveying assembly are fitted onto another common pulley. The feeding mechanism also includes several bases, which are connected to the frame and are positioned above the pulleys. All the pulleys are rotatably connected to the bases.

[0008] Preferably, the collection unit includes: Several air ducts are installed on the frame, and the air ducts are used to assist the tea leaves in moving from the entrance of each collection chamber to the corresponding collection chamber exit by supplying air into the collection chamber. A collection component, located at the bottom of each collection chamber, is used to transport tea leaves that fall onto it to the exit of that collection chamber. The outlets of the secondary collection chamber and the primary collection chamber are arranged side by side at the rear end of the frame in the horizontal direction.

[0009] In this application, the air in the air duct originates from a fan. The air blown by the fan is sent into each collection chamber through the air duct, which can assist in driving the tea leaves in each collection chamber and also assist in feeding each feeding unit. That is, the air conveying force of the air duct can achieve the following effects: it can prevent longer tea leaves from getting stuck on the second feeding unit and shorter tea leaves from getting stuck on the first feeding unit. When the tea leaves are transported by each feeding unit to the end of the corresponding conveying channel, the air force can assist the tea leaves to fall into the corresponding collection chamber. At the same time, it can also cooperate with the conveying components to move the tea leaves that have fallen into each collection chamber to the outlet of each corresponding collection chamber, and can also prevent the tea leaves from getting stuck in the conveying components of each collection chamber.

[0010] Preferably, at least one first baffle is provided in the secondary collection chamber. The first baffle is inclined so that the space inside the secondary collection chamber is in a contracting state from the entrance to the exit of the secondary collection chamber. Preferably, at least one second baffle is provided in the primary collection chamber, and the second baffle 38 is inclined so that the space inside the primary collection chamber is in a contracted state from the entrance of the primary collection chamber to the exit of the secondary collection chamber. In this application, both the first baffle and the second baffle can assist and guide the tea leaves in the corresponding collection chamber to move from their outlet to the outlet of the corresponding collection chamber.

[0011] Preferably, the bottom of the primary collection chamber is used as the top of the secondary collection chamber. In the horizontal direction, the front end of the top of the secondary collection chamber is positioned further back on the overall frame than the front end of the bottom of the secondary collection chamber, thus forming the entrance of the secondary collection chamber.

[0012] In this application, it can be understood that the distance from the front end of the bottom of the secondary collection chamber to the vertical plane is greater than the distance from the top of the secondary collection chamber to the vertical plane.

[0013] Preferably, the feeding mechanism is inclined relative to the collection chamber and the bottom of the frame, and the inclination direction of the feeding mechanism extends from its front end to its rear end in a gradually increasing trend.

[0014] In this application, it is necessary to explain the meaning of each first conveying channel and each second conveying channel mentioned above. Each first conveying channel refers to the first feeding channel formed by different first feeding units, rather than multiple first feeding channels formed in one primary feeding unit. Similarly, each second feeding channel is also like this. In this application, only one corresponding conveying channel is formed in one feeding unit. In this application, the positional relationship between the primary feeding unit, the secondary feeding unit, and the base is as follows: both the primary and secondary feeding units are located below the base, and the secondary feeding unit is located above and behind the primary feeding unit as described above. There is a shared pulley between the primary and secondary feeding units. During installation, the conveying component of the secondary feeding unit is first installed below the base, and then the conveying component of the primary feeding unit is installed below the conveying component of the secondary feeding unit.

[0015] A first conveying channel and a feed inlet are formed between the first conveying component and the second conveying component. The feed inlet gradually narrows from the front end of the feeding unit to the first conveying channel, and the feed inlet is formed by at least two inclined surfaces. The tea leaves are collected from the inlet into the first conveying channel. The feeding unit clamps and transports the tea leaves through the first conveying component and the second conveying component. Shorter tea leaves fall from the rear end of the first conveying channel into the primary collection chamber, while longer tea leaves are continuously clamped and transported along the second conveying channel to the secondary collection chamber, thereby achieving the grading of tea leaves of different lengths.

[0016] In this application, it is necessary to further explain that the feed inlet is located at the front end of the conveying channel, while the discharge outlet is located at the rear end of the conveying channel, and the three are connected in sequence. From the two inclined surfaces mentioned above, it can be reasonably understood that the discharge outlet is located between the first conveying component and the second conveying component, and the two inclined surfaces are respectively located on the first conveying component and the second conveying component. In addition, the reference standard for front and rear in this application is: the part that comes into contact with the tea leaves first is the front, and the part that comes into contact with the tea leaves last is the rear.

[0017] The outer wall of the pulley is provided with several protrusions, and the conveyor belt is provided with several mounting holes. The protrusions can be installed in the mounting holes to prevent the conveyor belt from falling off the pulley and to allow for distance adjustment.

[0018] The first conveying assembly includes: a first pulley, a second pulley, a third pulley, a first conveyor belt, and a first base. The first pulley is disposed on the first base at a front end position. The third pulley is located behind the first pulley. The second pulley is located between the first pulley and the third pulley. The first conveyor belt is sleeved on the first pulley, the second pulley, and the third pulley. The upper ends of the first pulley, the second pulley, and the third pulley are all rotatably connected to the lower end face of the first base. The second conveying assembly includes a fourth pulley, a fifth pulley, a sixth pulley, a second conveyor belt, and a second base. The fourth pulley is located at the front end of the second base, the sixth pulley is located behind the fourth pulley, and the fifth pulley is located between the fourth and sixth pulleys. The second conveyor belt is sleeved over the fourth, fifth, and sixth pulleys. The upper ends of the fourth, fifth, and sixth pulleys are rotatably connected to the lower end face of the second base. The conveyor belt between the first and second pulleys forms an inclined surface around the feed inlet, and the conveyor belt between the fourth and fifth pulleys forms another inclined surface around the feed inlet. A first conveying channel is formed between the first conveyor belt between the second and third pulleys and the second conveyor belt between the fifth and sixth pulleys.

[0019] The third conveying assembly includes an eighth pulley and a third conveyor belt. The eighth pulley is located at the rear end of the first base. The front end of the third conveyor belt is sleeved on the third pulley, the rear end is sleeved on the eighth pulley, and the third conveyor belt is located above the first conveyor belt. The fourth conveying assembly includes a tenth pulley and a fourth conveyor belt. The tenth pulley is located at the rear end of the second base. The front end of the fourth conveyor belt is sleeved on the sixth pulley, and the rear end is sleeved on the tenth pulley. The fourth conveyor belt is located above the second conveyor belt. A second conveying channel is formed between the third and fourth conveyor belts.

[0020] In this application, it should be explained that the third pulley is a shared pulley of the first conveying component and the third conveying component, and the sixth pulley is a shared pulley of the second conveying component and the fourth conveying component, and is also a shared pulley. That is, the third pulley and the sixth pulley are a set of pulleys shared by the primary feeding unit and the secondary feeding unit.

[0021] Preferably, the third pulley is located at a position slightly forward or slightly backward on the side of the sixth pulley, so that the rear section of the first conveyor belt is offset from the rear section of the second conveyor belt, forming a first discharge port connected to the rear end of the first conveying channel; The eighth pulley is located at a position slightly forward or backward on the side of the tenth pulley, so that the rear section of the third belt and the fourth belt are offset, forming a second discharge port connected to the rear end of the second conveying channel.

[0022] In this application, the rear ends of both the primary and secondary feeding units are staggered in length. It needs further explanation that the staggered arrangement of the rear end of the primary feeding unit does not necessarily need to be synchronized with the staggered arrangement of the front end. That is, the staggered arrangement of the components at the rear end of the primary feeding unit can be the same as the staggered arrangement of the front end (where the front end of a component is further forward than another component, its rear end is also further forward), or it can be staggered (where the front end of a component is further forward than another component, its rear end is further backward). Since the third and sixth pulleys are shared pulleys, the staggered arrangement of the front end of the secondary feeding unit is synchronized with the staggered arrangement of the rear end of the primary feeding unit. However, it should be further emphasized that the staggered arrangement of the rear end of the secondary feeding unit can also be either synchronized or staggered with the staggered arrangement of the front end.

[0023] The first conveying channel in the primary feeding unit and the second conveying channel in the corresponding secondary feeding unit are located in the same vertical plane, and the width of the first conveying channel and the second conveying channel are the same, and the width of each is no greater than 1mm.

[0024] Preferably, in step two), the device adjustment includes: 2.1) Adjust the vertical distance between the primary feeding unit and the secondary feeding unit; 2.2) Connect storage bags of different volumes to the exits of the secondary and primary collection chambers as needed; 2.3) Adjust the operating speed of the collection components in different collection chambers and the air force in the duct.

[0025] 5. A tea harvesting and grading method with adjustable grading standards according to claim 4, characterized in that, in step 2.1), the specific details of adjusting the vertical distance between the primary feeding unit and the secondary feeding unit include: 2.1.1) Determine the length range of longer and shorter tea leaves based on tea picking requirements and actual tea growth conditions; 2.1.2) Select appropriate conveyor belts based on actual usage requirements, and determine the distance between the primary feeding unit and the secondary feeding unit; 2.1.3) Using the upper end face of the cutting component as a reference, the conveyor belt in 2.1.2) is respectively fitted onto the pulleys in the primary feeding unit and the secondary feeding unit.

[0026] Preferably, in step two, the parameters for distance adjustment must meet the following requirements: The vertical distance H6 between the protrusions on the pulley is 4.5-6.5 mm. The width H1 of the conveyor belt in the primary feeding unit is 10-15mm; The width H5 of the conveyor belt in the secondary feeding unit is 10-15mm; The length H7 of the pulley shared by the primary feeding unit and the secondary feeding unit is 40-55mm; that is, the length of the third pulley and the sixth pulley.

[0027] The distance H3 between the lower end of the primary feeding unit and the upper end face of the cutting assembly is between (8, H7-H5-H1-2), in mm, where 8 mm is the lowest position and H7-H5-H1-2 is the highest position. Once the position of the primary feeding unit is fixed, the lower end face of the secondary feeding unit is always higher than the upper end face of the primary feeding unit. The distance H4 between the secondary feeding unit and the upper end face of the cutting assembly is adjustable between (H3+H1+2, H7-H5) in mm, where H3+H1+2 is the lowest position and H7-H5 is the highest position.

[0028] The above content in this application can be understood as follows: by adjusting the position of the conveyor belts in the primary feeding unit and the secondary feeding unit on the common pulley (the positions on the common pulley and other pulleys of each feeding unit need to be adjusted synchronously), the picking standards of the two grades of tea can be adjusted.

[0029] Preferably, the vertical distance H6 between the protrusions on the pulley is 5mm, the width H1 of the conveyor belt in the primary feeding unit is 10mm, the width H5 of the conveyor belt in the secondary feeding unit is 10mm, and the length H7 of the pulley shared by the primary and secondary feeding units is 50mm. Then, the adjustment range of the position of the conveyor belt on the primary feeding unit is 8-28mm from the bottom of the conveyor belt to the upper surface of the blade in the cutting assembly below, which can be understood as the distance from the cutting position. Similarly, after the position of the conveyor belt on the primary feeding unit is determined, the position of the conveyor belt on the secondary feeding unit is adjusted between (H3+H1+2, H7-H5). At the same time, during the adjustment, it is ensured that the position of the conveyor belt in the primary feeding unit is ultimately lower than the position of the conveyor belt in the secondary feeding unit. For example, when the bottom of the conveyor belt of the primary feeding unit is 8mm from the upper surface of the lower cutting blade (H3), the distance H4 between the position of the conveyor belt of the secondary feeding unit and the upper end face of the cutting assembly can be adjusted within the range of (20mm, 40mm); when the bottom of the conveyor belt of the primary feeding unit is 28mm from the upper surface of the lower cutting blade (H3), the distance H4 between the position of the conveyor belt of the secondary feeding unit and the upper end face of the cutting assembly is 40mm.

[0030] Preferably, the combinations of conveyor belt positions in the primary feeding unit and the secondary feeding unit are (H3, H4) as follows: (8, 33), (13, 43), (18, 48), where all numbers in parentheses are in mm, and the numbers in parentheses represent the distance between the conveyor belt in the feeding unit and the upper surface of the cutting component. The first number in the parentheses is the parameter corresponding to the primary feeding unit, and the second number is the parameter corresponding to the secondary feeding unit. When the above three preferred combinations are used, the corresponding lengths of the two levels of tea tree shoots that can be collected are shown in the table below.

[0031]

[0032] In the above content, Level 1 corresponds to the tea leaves collected by the Level 1 feeding unit, that is, the tea leaves that enter the Level 1 collection chamber, and Level 2 corresponds to the tea leaves collected by the Level 2 feeding unit, that is, the tea leaves that enter the Level 2 collection chamber.

[0033] Furthermore, when grading is not required, only the conveyor belt in the primary feeding unit can be retained. In this case, the adjustment range of the conveyor belt position in the primary feeding unit is 8-38mm from the bottom of the conveyor belt to the upper surface of the lower blade. When the bottom of the conveyor belt is 8mm from the upper surface of the lower blade, the harvestable new shoot length is 13-65mm. When the bottom of the conveyor belt is 38mm from the upper surface of the lower blade, the harvestable new shoot length is 45-65mm, meaning the shortest harvestable new shoot is adjustable within the range of 13-45mm.

[0034] Preferably, in step 2.2), the specific steps for installing storage bags of different volumes are as follows: 2.2.1) Based on the length range of longer and shorter tea leaves determined in step 2.1.1), estimate the volume of tea leaves of different lengths picked within a certain period of time; 2.2.2) Determine the volume of the collection bag installed at the outlet of the secondary collection chamber and the volume of the collection bag installed at the outlet of the primary collection chamber according to the content in step 2.2.1); 2.2.3) The volume of the collection bag installed at the exit of the secondary collection chamber should be larger than the volume of the collection bag installed at the exit of the primary collection chamber.

[0035] Preferably, the specific content of adjusting the operating speed of the collection components in different collection chambers in step 2.3) includes: 2.3.1) Obtain information on tea variety and actual tea growth conditions (including the length of longer and shorter tea leaves). 2.3.2) Obtain the distance from the entrance to the corresponding exit of the secondary collection chamber and the primary collection chamber; 2.3.3) Refer to the content of step 2.3.1) and step 2.3.2) to set the operating speed of the collection components in different collection chambers and the wind force in the air duct.

[0036] Preferably, in step three), the tea picking includes: 3.1) Activate the tea harvesting and grading device to harvest the tea leaves; 3.2) Both longer and shorter tea leaves are centrally and uniformly clamped and transported in the first conveying channel through the primary feeding unit; 3.3) The cutting component cuts all the tea leaves in the first conveying channel; 3.4) The primary feeding unit transports the tea leaves to the end. Shorter tea leaves fall from the end of the primary feeding unit and enter the primary collection chamber through the entrance of the primary collection chamber. The secondary feeding unit holds the longer tea leaves, allowing them to move and be transported in the second conveying channel. 3.5) Longer tea leaves fall from the tail end of the secondary feeding unit and enter the secondary collection chamber through the entrance of the secondary collection chamber.

[0037] Preferably, in step four), the specific content of grading and collecting tea leaves includes: 4.1) The shorter tea leaves are collected in the primary collection chamber and the longer tea leaves are collected in the secondary collection chamber. 4.2) Shorter tea leaves are transported through the collection components in the primary collection chamber, while longer tea leaves are transported through the collection components in the secondary collection chamber; 4.3) The shorter tea leaves are concentrated and guided to the outlet of the primary collection chamber (31) by the second baffle auxiliary collection component in the primary collection chamber; 4.4) The longer tea leaves are concentrated and guided to the outlet of the secondary collection chamber by the first baffle auxiliary collection component in the secondary collection chamber; 4.5) The tea leaves are transported into the collection bags in each collection room by the inertia of the tea leaves and the air in the air duct, so as to achieve graded collection.

[0038] Compared with the prior art, the beneficial effects of the present invention are: 1. This application, by setting up two feeding units, enables the grading of tea leaves according to their different lengths during tea picking. Furthermore, by setting up a conveyor belt with mounting holes and a pulley with protrusions, the distance between the primary and secondary feeding units in the vertical direction can be adjusted. By increasing or decreasing the distance between them, tea leaves of different lengths can be graded, achieving adjustable grading standards. This allows the equipment to be applied to tea picking operations of different standards, reducing subsequent tea processing and efficiently and conveniently completing the tea picking and grading process. It also gives this application strong adaptability.

[0039] 2. This application sets the outlets of the two collection chambers horizontally offset, with no vertical overlap between the two openings. During tea harvesting, the storage bags installed at the two openings will not interfere with each other, especially preventing the storage bag at the upper outlet from pressing against the storage bag at the lower outlet. As the amount of tea harvested increases, the pressure between the two storage bags will increase rapidly, seriously affecting the entry of tea into the storage bags. At the same time, based on the setting of relevant parameters, this application can ensure that as the amount of tea harvested increases, the graded tea stored will not have a serious weight difference on the left and right sides of the device due to the increase in weight, thereby avoiding device offset caused by uneven weight during tea harvesting, improving the fault tolerance rate, and ensuring that the length of the harvested tea leaves is relatively uniform. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial bottom view of the structure of the present invention; Figure 3 This is a partial structural diagram of the frame in this invention; Figure 4 This is a partial structural diagram of the frame in this invention; Figure 5 This is a schematic diagram of a portion of the frame structure from other angles in this invention; Figure 6 This is a partial structural side view of the primary feeding unit and the secondary feeding unit in this invention; Figure 7 This is a schematic diagram of the dimensions in Embodiment 1 of the present invention; Figure 8 This is a partial top view of the primary feeding unit and the secondary feeding unit in this invention; Figure 9 This is a partial structural diagram of the primary feeding unit in this invention; Figure 10 This is a partial structural diagram of the secondary feeding unit in this invention; Figure 11 This is a partial structural side view of the primary feeding unit and the secondary feeding unit in Embodiment 2 of the present invention; Figure 12 This is a partial structural side view of the primary feeding unit and the secondary feeding unit in Embodiment 3 of the present invention; In the diagram: First conveying assembly 1, Second conveying assembly 2, First conveying channel 3, Inlet 4, Third conveying assembly 5, Fourth conveying assembly 6, Second conveying channel 7, Frame 8, Protrusion 9, First pulley 10, Second pulley 11, Third pulley 12, First conveyor belt 13, First base 14, Fourth pulley 15, Fifth pulley 16, Sixth pulley 17, Second conveyor belt 18, Second base 19, Eighth pulley 21, Third conveyor belt 22, Tenth pulley 25, Fourth conveyor belt 26, First outlet 28, Second outlet 29, Secondary collection chamber 30, Primary collection chamber 31, Primary feeding unit 32, Secondary feeding unit 33, Cutting assembly 34, First collection assembly 35, Second collection assembly 36, First baffle 37, Second baffle 38, Second outlet 39, First outlet 40, Mounting hole 41. Detailed Implementation

[0041] The following will refer to the appendices in the embodiments of the present invention. Figure 1-9 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be understood that the terms "first-level," "second-level," "first," and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0043] Please see Figure 1-12 Embodiments of the present invention: Example 1: like Figure 1-5 As shown: A tea harvesting and grading method with adjustable grading standards, characterized by the following steps: (i) Provides a tea harvesting and grading device with adjustable grading standards, the device comprising: The frame 8 is provided with a collection chamber, which includes a secondary collection chamber 30 and a primary collection chamber 31. The secondary collection chamber 30 is located above the primary collection chamber 31. The entrance of the primary collection chamber 31 is located horizontally between the front end of the frame 8 and the entrance of the secondary collection chamber 30. The exits of the secondary collection chamber 30 and the exit of the primary collection chamber 31 are staggered and located at the rear end of the frame 8. The feeding mechanism is mounted on the frame 8 and located in front of the collection chamber. The feeding mechanism includes at least one primary feeding unit 32 and one secondary feeding unit 33. The secondary feeding unit 33 is located above and behind the primary feeding unit 32, and the two correspond one-to-one. The tail end of the primary feeding unit 32 is located above the primary collection chamber 31, and the tail end of the secondary feeding unit 33 is located above the secondary collection chamber 30. All feeding units consist of at least a conveyor belt and multiple pulleys. Several protrusions 9 are provided on the outside of the pulleys. Several mounting holes 41 are provided on the conveyor belt. The protrusions 9 can be fitted with the mounting holes 41 for installation. The conveyor belt is sleeved on the pulleys to form a loop, and the rear end of the primary feeding unit 32 and the front end of the secondary feeding unit 33 share a set of pulleys. A collection unit, located inside a collection chamber, is used to transport tea leaves from the entrance to the exit of the collection chamber. Cutting assembly 34, which is connected to the frame 8 and is located below and in front of the primary feeding unit 32; like Figure 1 , 2 As shown in Figure 7: In step one), the adjacent primary feeding units 32 and the secondary feeding units 33 are symmetrically arranged; The primary feeding unit 32 includes a first conveying component 1 and a second conveying component 2. A first conveying channel 3 is formed between the first conveying component 1 and the second conveying component 2. The first conveying channels 3 in each primary feeding unit 32 are parallel to each other. The secondary feeding unit 33 includes a third conveying component 5 and a fourth conveying component 6. The third conveying component 5 is located above and behind the first conveying component 1, and the fourth conveying component 6 is located above and behind the second conveying component 2. A second conveying channel 7 is formed between the third conveying component 5 and the fourth conveying component 6. The second conveying channels 7 in each secondary feeding unit 33 are parallel to each other. In the first conveying assembly 1, the rear end of the conveyor belt and the front end of the conveyor belt in the third conveying assembly are fitted onto a common pulley, and in the second conveying assembly 2, the rear end of the conveyor belt and the front end of the conveyor belt in the fourth conveying assembly are fitted onto another common pulley. The feeding mechanism also includes several bases, which are connected to the frame 8. The bases are positioned above the pulleys, and the pulleys are rotatably connected to the bases.

[0044] For ease of representation, the outlet of the secondary collection chamber 30 is referred to as the second outlet 39, the outlet of the primary collection chamber 31 is referred to as the first outlet 40, the collection components in the secondary collection chamber 30 are referred to as collection components 35, and the collection components in the primary collection chamber 31 are referred to as the second collection components 36.

[0045] The collection unit includes: Several air ducts are installed on the frame 8, and the air ducts are used to assist the tea leaves in moving from the entrance of each collection chamber to the corresponding collection chamber exit by supplying air into the collection chamber. A collection component, located at the bottom of each collection chamber, is used to transport tea leaves that fall onto it to the exit of that collection chamber. The outlets of the secondary collection chamber 30 and the primary collection chamber 31 are arranged side by side in the horizontal direction at the rear end of the frame 8.

[0046] like Figure 3-5 As shown: At least one first baffle 37 is provided in the secondary collection chamber 30. The first baffle is inclined so that the space inside the secondary collection chamber 30 is in a contracted state from the entrance of the secondary collection chamber 30 to the exit of the secondary collection chamber 30. At least one second baffle 38 is provided in the primary collection chamber 31. The second baffle 38 is inclined so that the space in the primary collection chamber 31 is in a contracted state from the entrance of the primary collection chamber 31 to the exit of the secondary collection chamber 30. In this application, the first baffle 37 and the second baffle 38 mentioned above can both assist and guide the tea leaves in the corresponding collection chamber to move from their outlet to the outlet of the corresponding collection chamber.

[0047] like Figure 3-5 As shown: The bottom of the primary collection chamber 31 is used as the top of the secondary collection chamber 30. In the horizontal direction, the front end of the top of the secondary collection chamber 30 is positioned further back on the frame 8 than the front end of the bottom of the secondary collection chamber 30, so as to form the entrance of the secondary collection chamber 30.

[0048] like Figure 6As shown: The feeding mechanism is inclined relative to the bottom of the collection chamber and the frame 8, and the inclination direction of the feeding mechanism extends from its front end to its rear end in a gradually increasing trend.

[0049] like Figure 6-10 As shown: A first conveying channel 3 and a feed inlet 4 are formed between the first conveying component 1 and the second conveying component 2. The feed inlet 4 gradually narrows from the front end of the feeding unit to the first conveying channel 3, and the feed inlet 4 is formed by at least two inclined surfaces. The tea leaves are collected from the inlet 4 into the first conveying channel 3. The feeding unit clamps and transports the tea leaves through the first conveying component 1 and the second conveying component 2. Shorter tea leaves fall from the rear end of the first conveying channel 3 into the primary collection chamber 31, while longer tea leaves are continuously clamped and transported along the second conveying channel 7 to the secondary collection chamber 30, thereby achieving the grading of tea leaves of different lengths.

[0050] In this application, it is necessary to further explain that the feed inlet 4 is located at the front end of the conveying channel, while the discharge outlet is located at the rear end of the conveying channel, and the three are connected in sequence. From the two inclined surfaces mentioned above, it can be reasonably understood that the discharge outlet is located between the first conveying component 1 and the second conveying component 2, and the two inclined surfaces are respectively located on the first conveying component 1 and the second conveying component 2. In addition, the reference standard for front and rear in this application is: the part that comes into contact with the tea leaves first is the front, and the part that comes into contact with the tea leaves last is the rear.

[0051] The outer wall of the pulley is provided with several protrusions 9, and the conveyor belt is provided with several mounting holes 41. The protrusions 9 can be installed in the mounting holes 41 to prevent the conveyor belt from falling off the pulley and to adjust the distance.

[0052] The first conveying assembly 1 includes: a first pulley 10, a second pulley 11, a third pulley 12, a first conveyor belt 13, and a first base 14. The first pulley 10 is disposed on the first base 14 at a position near the front end. The third pulley 12 is located behind the first pulley. The second pulley 11 is located between the first pulley 10 and the third pulley 12. The first conveyor belt 13 is sleeved on the first pulley 10, the second pulley 11, and the third pulley 12. The upper ends of the first pulley 10, the second pulley 11, and the third pulley 12 are all rotatably connected to the lower end face of the first base 14. The second conveying assembly 2 includes a fourth pulley 15, a fifth pulley 16, a sixth pulley 17, a second conveyor belt 18, and a second base 19. The fourth pulley 15 is located at the front end of the second base 19. The sixth pulley 17 is located behind the fourth pulley 15. The fifth pulley 16 is located between the fourth pulley 15 and the sixth pulley 17. The second conveyor belt 18 is sleeved on the fourth pulley 15, the fifth pulley 16, and the sixth pulley 17. The upper ends of the fourth pulley 15, the fifth pulley 16, and the sixth pulley 17 are rotatably connected to the lower end face of the second base 19. The conveyor belt between the first pulley 10 and the second pulley 11 forms an inclined surface surrounding the feed inlet 4, and the conveyor belt between the fourth pulley 15 and the fifth pulley 16 forms another inclined surface surrounding the feed inlet 4. The first conveyor belt 13 between the second pulley 11 and the third pulley 12 and the second conveyor belt 18 between the fifth pulley 16 and the sixth pulley 17 form a first conveying channel 3, that is, the first conveyor belt 13 and the second conveyor belt 18 form a second conveying channel 3.

[0053] The third conveying assembly 5 includes an eighth pulley 21 and a third conveyor belt 22. The eighth pulley 21 is located at the rear end of the first base 14. The front end of the third conveyor belt 22 is sleeved outside the third pulley 12, and the rear end is sleeved outside the eighth pulley 21. The third conveyor belt 22 is located above the first conveyor belt 13. The fourth conveying assembly 6 includes a tenth pulley 25 and a fourth conveyor belt 26. The tenth pulley 25 is located at the rear end of the second base 19. The front end of the fourth conveyor belt 26 is sleeved outside the sixth pulley 17, and the rear end is sleeved outside the tenth pulley 25. The fourth conveyor belt 26 is located above the second conveyor belt 18. A second conveying channel 7 is formed between the third and fourth conveyor belts.

[0054] In this application, it should be explained that the third pulley 12 is a shared pulley of the first conveying component 1 and the third conveying component 5, and the sixth pulley 17 is a shared pulley of the second conveying component 2 and the fourth conveying component 6, and is also a shared pulley. That is, the third pulley 12 and the sixth pulley 17 are a set of pulleys shared by the first-level feeding unit 32 and the second-level feeding unit 33.

[0055] like Figure 7 As shown: The third pulley 12 is located in a forward or rearward position on the side of the sixth pulley 17, so that the first conveyor belt 13 is offset from the rearward section of the second conveyor belt 18, forming a first discharge port 28 connected to the rear end of the first conveying channel 3. The eighth pulley 21 is located in a forward or rearward position on the side of the tenth pulley 25, so that the rearward section of the third belt and the fourth belt are staggered, forming a second discharge port 29 connected to the rear end of the second conveying channel 7.

[0056] In this application, the rear ends of both the feeding unit and the secondary feeding unit 33 are set with varying lengths. It needs further explanation that the staggered setting of the rear end of the feeding unit does not necessarily need to be synchronized with the staggered setting of the front end. That is, the staggered setting of the components at the rear end of the feeding unit can be the same as the staggered setting of the front end (the front end of one component relative to another component is positioned forward, and its rear end is also positioned forward relative to another component), or it can be asynchronous (the front end of one component relative to another component is positioned forward, and its rear end is positioned backward relative to another component). Since the third pulley 12 and the sixth pulley 17 are shared pulleys, the staggered setting of the front end of the secondary feeding unit 33 is synchronized with the staggered setting of the rear end of the feeding unit. However, it needs to be further emphasized that the staggered setting of the rear end of the secondary feeding unit 33 can also be either synchronized or asynchronous with the staggered setting of the front end of the secondary feeding unit 33.

[0057] The first conveying channel 3 in the feeding unit and the second conveying channel 7 in the corresponding secondary feeding unit 33 are located in the same vertical plane, and the width of the first conveying channel 3 and the second conveying channel 7 are the same, and the width of each is no greater than 1mm.

[0058] In this embodiment, the tea leaves are transported by a primary feeding unit 32, and a secondary feeding unit 33 is positioned above and behind the primary feeding unit 32. This allows longer tea leaves to be held by the secondary feeding unit 33 before leaving the primary feeding unit 32, and to remain held and transported by the secondary feeding unit 33 after leaving the primary feeding unit 32, exiting from the second discharge port 29 at the rear end of the secondary feeding unit 33. Shorter tea leaves, on the other hand, exit directly from the first discharge port 28 at the rear end of the primary feeding unit 32. This allows for grading of tea leaves based on their length during harvesting, achieving mechanized harvesting and avoiding subsequent screening processes, thus improving the efficiency of tea harvesting. Furthermore, both the primary feeding unit 32 and the secondary feeding unit 33 use belts with gaps to hold and transport the tea leaves, preventing damage and improving the quality of the harvested tea. The staggered arrangement of the conveying components, forming the first discharge port 28 and the second discharge port 29, also facilitates the detachment of tea leaves.

[0059] The outer wall of the pulley is provided with a number of protrusions 9, and the conveyor belt is provided with a number of mounting holes 41. The protrusions 9 can be set in the mounting holes 41 to prevent the conveyor belt from falling off the pulley.

[0060] In this embodiment, the protrusion 9 and the mounting hole 41 are designed to allow the conveyor belt to be securely fitted onto the pulley via the connection between the mounting hole 41 and the protrusion 9. Vertically, this ensures greater stability between the conveyor belt and the pulley during transmission, preventing the conveyor belt from slipping off the pulley. Horizontally, it increases the contact force between the conveyor belt and the pulley, further enhancing their stability during transmission. The protrusion 9 also increases the contact area between the pulley and the conveyor belt, strengthening their contact stability. Furthermore, the connection between the protrusion 9 and the mounting hole 41 allows for distance adjustment between the primary feeding unit 32 and the secondary feeding unit 33, enhancing adaptability.

[0061] The staggered arrangement of the front end of the primary feeding unit 32, the rear end of the secondary feeding unit 33, the front end of the secondary feeding unit 33, and the rear end of the secondary feeding unit 33 is set synchronously.

[0062] II) Equipment Allocation In step two), the device adjustment includes: 2.1) Adjust the vertical distance between the primary feeding unit 32 and the secondary feeding unit 33; 2.1.1) Determine the length range of longer and shorter tea leaves based on tea picking requirements and actual tea growth conditions; 2.1.2) Select appropriate conveyor belts according to actual usage requirements, and determine the distance between the primary feeding unit 32 and the secondary feeding unit 33; 2.1.3) Using the upper end face of the cutting assembly 34 as a reference, the conveyor belt in 2.1.2) is respectively fitted onto the pulleys in the primary feeding unit 32 and the secondary feeding unit 33.

[0063] The vertical distance H6 between the several protrusions 9 on the pulley is 5mm. The width H1 of the conveyor belt in the primary feeding unit 32 is 15mm; The width H5 of the conveyor belt in the secondary feeding unit 33 is 5mm; The length H7 of the pulley shared by the primary feeding unit 32 and the secondary feeding unit 33 is 45mm; that is, the length of the third pulley 12 and the sixth pulley 17.

[0064] The distance H3 between the lower end of the primary feeding unit 32 and the upper end face of the cutting assembly 34 is 8mm; The distance H4 between the lower end face of the secondary feeding unit 33 and the upper end face of the cutting assembly 34 is 33mm.

[0065] At this time, the corresponding new shoots to be picked are: Grade 1: length between 13-38mm, Grade 2: length between 38-65mm.

[0066] 2.2) Connect storage bags of different volumes to the exits of the secondary collection chamber 30 and the primary collection chamber 31 as needed; 2.2.1) Based on the length range of longer and shorter tea leaves determined in step 2.1.1), estimate the volume of tea leaves of different lengths picked within a certain period of time; 2.2.2) Determine the volume of the collection bag installed at the outlet of the secondary collection chamber 30 and the volume of the collection bag installed at the outlet of the primary collection chamber 31 according to the content in step 2.2.1); 2.2.3) The volume of the collection bag installed at the exit of the secondary collection chamber 30 should be larger than the volume of the collection bag installed at the exit of the primary collection chamber 31.

[0067] 2.3) Adjust the operating speed of the collection components in different collection chambers and the air force in the duct.

[0068] 2.3.1) Obtain information on tea varieties and actual tea growth conditions; 2.3.2) Obtain the distance from the entrance to the corresponding exit of the secondary collection chamber 30 and the primary collection chamber 31; 2.3.3) Refer to the content of step 2.3.1) and step 2.3.2) to set the operating speed of the collection components in different collection chambers and the wind force in the air duct.

[0069] III. Tea Picking 3.1) Activate the tea harvesting and grading device to harvest the tea leaves; 3.2) Both longer and shorter tea leaves are centrally and uniformly clamped and transported in the first conveying channel through the primary feeding unit 32; 3.3) The cutting component 34 cuts all the tea leaves in the first conveying channel 3; 3.4) The primary feeding unit 32 transports the tea leaves to the end. The shorter tea leaves fall from the end of the primary feeding unit 32 and enter the primary collection chamber 31 through the entrance of the primary collection chamber 31. The secondary feeding unit 33 holds the longer tea leaves and moves them in the second conveying channel. 3.5) Longer tea leaves fall from the tail end of the secondary feeding unit 33 and enter the secondary collection chamber 30 through the entrance of the secondary collection chamber 30.

[0070] IV) Grading and collecting tea leaves 4.1) The shorter tea leaves are collected by the primary collection chamber 31 and conveyed by the primary feeding unit 32, while the longer tea leaves are collected by the secondary collection chamber 30 and conveyed by the secondary feeding unit 33. 4.2) Shorter tea leaves are transported through the collection components in the primary collection chamber 31, and longer tea leaves are transported through the collection components in the secondary collection chamber 30; 4.3) The longer tea leaves are concentrated and guided to the outlet of the secondary collection chamber 30 by the first baffle auxiliary collection component in the secondary collection chamber 30; 4.4) The shorter tea leaves are concentrated and guided to the outlet of the primary collection chamber 31 by the second baffle auxiliary collection component in the primary collection chamber 31; 4.5) The tea leaves are transported into the collection bags in each collection room by the inertia of the tea leaves and the air in the air duct, so as to achieve graded collection.

[0071] Example 2: The difference between this example and Example 1 is that the distance between the primary feeding unit 32 and the secondary feeding unit 33 is different in this example, that is, the tea leaves that can be harvested are also different.

[0072] like Figure 11 As shown in this embodiment: The distance H3 between the lower end of the primary feeding unit 32 and the upper end face of the cutting assembly 34 is 13mm; The distance H4 between the lower end face of the secondary feeding unit 33 and the upper end face of the cutting assembly 34 is 43mm.

[0073] At this time, the corresponding new shoots to be picked are: Grade 1: 18-48mm in length, Grade 2: 48-65mm in length.

[0074] Example 3: The difference between this example and Example 1 is that the distance between the primary feeding unit 32 and the secondary feeding unit 33 is different in this example, that is, the tea leaves that can be harvested are also different.

[0075] In this embodiment: like Figure 12 As shown: The distance H3 between the lower end of the primary feeding unit 32 and the upper end face of the cutting assembly 34 is 18mm; The distance H4 between the lower end face of the secondary feeding unit 33 and the upper end face of the cutting assembly 34 is 43mm.

[0076] At this time, the corresponding new shoots to be picked are: Grade 1: length between 23-38mm, Grade 2: length between 48-65mm.

[0077] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0078] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tea harvesting and grading method with adjustable grading standards, characterized in that, Includes the following steps: (i) Provides a tea harvesting and grading device with adjustable grading standards, the device comprising: The frame (8) is provided with a collection chamber, which includes a secondary collection chamber (30) and a primary collection chamber (31). The secondary collection chamber (30) is located above the primary collection chamber (31). The entrance of the primary collection chamber (31) is located horizontally between the front end of the frame (8) and the entrance of the secondary collection chamber (30). The exit of the secondary collection chamber (30) and the exit of the primary collection chamber (31) are staggered and located at the rear end of the frame (8). The feeding mechanism is mounted on the frame (8) and located in front of the collection chamber. The feeding mechanism includes at least one primary feeding unit (32) and one secondary feeding unit (33). The secondary feeding unit (33) is located above and behind the primary feeding unit (32), and the two correspond one-to-one. The tail end of the primary feeding unit (32) is located above the primary collection chamber (31), and the tail end of the secondary feeding unit (33) is located above the secondary collection chamber (30). All feeding... Each unit consists of at least a conveyor belt and multiple pulleys. Several protrusions are provided on the outer side of the pulleys, and several mounting holes are provided on the conveyor belt. The protrusions can be fitted and installed with the mounting holes. The conveyor belt is sleeved on the pulleys to form a loop. The rear end of the primary feeding unit (32) and the front end of the secondary feeding unit (33) share a set of pulleys. The distance between the primary feeding unit and the secondary feeding unit in the vertical direction is adjusted by the conveyor belt with mounting holes and the pulleys with protrusions. A collection unit, located inside a collection chamber, is used to transport tea leaves from the entrance to the exit of the collection chamber. The collection unit includes: Several air ducts are set on the frame (8) to assist tea leaves in moving from the entrance of each collection chamber to the corresponding collection chamber exit by supplying air to the collection chamber. A collection component, located at the bottom of each collection chamber, is used to transport tea leaves that fall onto it to the exit of that collection chamber. The outlets of the secondary collection chamber (30) and the primary collection chamber (31) are arranged side by side in the horizontal direction at the rear end of the frame (8); The cutting assembly (34) is connected to the frame (8) and is located below and in front of the primary feeding unit (32); II. Equipment Adjustment; Equipment deployment includes: 2.1) Adjust the vertical distance between the primary feeding unit (32) and the secondary feeding unit (33); 2.1.1) Determine the length range of different grades of tea based on tea picking requirements and actual tea growth conditions; 2.1.2) Select appropriate conveyor belts according to actual usage requirements, and determine the distance between the primary feeding unit (32) and the secondary feeding unit (33); 2.1.3) Using the upper end face of the cutting component as a reference, the conveyor belt in step 2.1.2) is respectively fitted onto the pulleys in the primary feeding unit (32) and the secondary feeding unit (33); 2.2) Connect storage bags of different volumes to the exits of the secondary collection chamber (30) and the primary collection chamber (31) as needed; 2.3) Adjust the operating speed of the collection components in different collection chambers and the airflow in the duct; III. Tea picking; 4) Grade and collect tea leaves.

2. The tea harvesting and grading method with adjustable grading standards according to claim 1, characterized in that, in step one), the adjacent primary feeding units (32) and the secondary feeding units (33) are symmetrically arranged; The primary feeding unit (32) includes a first conveying component (1) and a second conveying component (2), and a first conveying channel (3) is formed between the first conveying component (1) and the second conveying component (2). The first conveying channels (3) in each primary feeding unit (32) are parallel to each other. The secondary feeding unit (33) includes a third conveying component (5) and a fourth conveying component (6). The third conveying component (5) is located above and behind the first conveying component (1), and the fourth conveying component (6) is located above and behind the second conveying component (2). A second conveying channel (7) is formed between the third conveying component (5) and the fourth conveying component (6). The second conveying channels (7) in each secondary feeding unit (33) are parallel to each other. The rear end of the conveyor belt in the first conveyor assembly (1) and the front end of the conveyor belt in the third conveyor assembly are fitted onto a common pulley, and the rear end of the conveyor belt in the second conveyor assembly (2) and the front end of the conveyor belt in the fourth conveyor assembly are fitted onto another common pulley. The feeding mechanism also includes several bases, which are connected to the frame (8). The bases are located above the pulleys, and the pulleys are rotatably connected to the bases.

3. The tea harvesting and grading method with adjustable grading standards according to claim 2, characterized in that, In step two, the parameters for distance adjustment must meet the following requirements: The vertical distance H6 between the protrusions on the pulley is 5.5-6.5 mm. The width H1 of the conveyor belt in the primary feeding unit (32) is 10-15mm; The width H5 of the conveyor belt in the secondary feeding unit (33) is 10-15mm; The length H7 of the pulley shared by the primary feeding unit (32) and the secondary feeding unit (33) is 40-55mm; The distance H3 between the lower end of the first-level feeding unit (32) and the upper end face of the cutting component is between (8, H7-H5-H1-2), in mm, where 8 mm is the lowest position and H7-H5-H1-2 is the highest position. Once the position of the primary feeding unit (32) is fixed, the lower end face of the secondary feeding unit (33) is always higher than the upper end face of the primary feeding unit (32), and the distance H4 between it and the upper end face of the cutting component is adjustable between (H3+H1+2, H7-H5), with the unit being mm, where H3+H1+2 is the lowest position and H7-H5 is the highest position.

4. The tea harvesting and grading method with adjustable grading standards according to claim 3, characterized in that, In step 2.2), the specific steps for installing storage bags of different volumes are as follows: 2.2.1) Based on the length range of longer and shorter tea leaves determined in step 2.1.1), estimate the volume of tea leaves of different lengths picked within a certain period of time; 2.2.2) Determine the volume of the collection bag installed at the outlet of the secondary collection chamber (30) and the volume of the collection bag installed at the outlet of the primary collection chamber (31) according to the contents of step 2.2.1); 2.2.3) The volume of the collection bag installed at the outlet of the secondary collection chamber (30) should be greater than the volume of the collection bag installed at the outlet of the primary collection chamber (31).

5. A tea harvesting and grading method with adjustable grading standards according to claim 4, characterized in that, The specific details of adjusting the operating speed of the collection components in different collection chambers in step 2.3) include: 2.3.1) Obtain information on tea varieties and actual tea growth conditions; 2.3.2) Obtain the distance from the entrance to the corresponding exit of the secondary collection chamber (30) and the primary collection chamber (31); 2.3.3) Refer to the content of step 2.3.1) and step 2.3.2) to set the operating speed of the collection components in different collection chambers and the wind force in the air duct.

6. A tea harvesting and grading method with adjustable grading standards according to claim 2, 3, 4 or 5, characterized in that, Step three) includes the following tea picking activities: 3.1) Activate the tea harvesting and grading device to harvest the tea leaves; 3.2) Both longer and shorter tea leaves are transported in a centralized and uniform manner through the primary feeding unit (32) in the first conveying channel (3); 3.3) The cutting component (34) cuts all the tea leaves in the first conveying channel (3); 3.4) The first-level feeding unit (32) transports the tea leaves to the end. The shorter tea leaves fall from the end of the first-level feeding unit (32) and enter the first-level collection chamber (31) from the entrance of the first-level collection chamber (31). The second-level feeding unit (33) holds the longer tea leaves, so that the longer tea leaves move and are transported in the second conveying channel (7). 3.5) Longer tea leaves fall from the tail end of the secondary feeding unit (33) and enter the secondary collection chamber (30) through the entrance of the secondary collection chamber (30).

7. A tea harvesting and grading method with adjustable grading standards according to claim 6, characterized in that, In step four), the specific content of grading and collecting tea leaves includes: 4.1) The shorter tea leaves are collected by the primary collection chamber (31) and the longer tea leaves are collected by the secondary collection chamber (30) and the secondary feeding unit (33). 4.2) Shorter tea leaves are transported through the collection components in the primary collection chamber (31), and longer tea leaves are transported through the collection components in the secondary collection chamber (30); 4.3) The shorter tea leaves are collected and directed to the outlet of the primary collection chamber (31) through the collection components in the primary collection chamber (31); 4.4) The longer tea leaves are collected and directed to the outlet of the secondary collection chamber (30) through the collection components in the secondary collection chamber (30); 4.5) The tea leaves are transported into the collection bags in each collection room by the inertia of the tea leaves and the air in the air duct, so as to achieve graded collection.

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