Tea grading equipment

Abstract

The utility model relates to the field of tea processing, in particular to tea grading equipment which comprises a rotary drum, a motor for driving the rotary drum to rotate is coaxially and detachably fixed at the outer bottom of the rotary drum, a plurality of grades of screening drums are coaxially and detachably fixed in the rotary drum in sequence from outside to inside, a gap is kept between every two adjacent screening drums, and screening holes are distributed in the screening drums. And the apertures of the screening holes in the multiple stages of screening cylinders arranged from outside to inside are sequentially increased. Compared with the prior art, by arranging the rotary drum and the screening drum, the technical problem that in the prior art, in the grading process, tea leaves with small sizes are possibly blown up and fall into corresponding collecting chambers through large screening holes, and the final actual grading effect of the tea leaves is poor is solved.

Description

Technical Field

[0001] This utility model patent relates to the field of tea processing, and specifically to a tea grading device. Background Art

[0002] Tea refers to the leaves and buds of tea plants, generally referring to the leaves of evergreen shrub tea plants that can be used for making tea, as well as the beverages brewed with these leaves. Tea is one of the beverages that are very popular among the people in our country. During the process of tea processing, some teas need to be classified. According to the size and the number of leaves, they can basically be divided into one bud with one leaf, one bud with two leaves, one bud with three leaves, etc., which is convenient for processing different teas in different ways.

[0003] The traditional processing method is to classify different-sized teas manually. In order to liberate the workers' hands, tea manufacturers have designed tea grading devices to classify teas of different sizes. The structures of current grading devices are mostly as described in the Chinese patent "A Centrifugal Special High-Quality Famous Tea Grading Machine" (Patent No. ZL201811206274.0, publication date February 12, 2019): The teas to be graded enter from the feeding hopper and gradually fall on the separation cone and are further dispersed around the separation cone; the air flow blown by the blower enters the air chamber and then blows upward from the air outlet between the separation cone and the conical sieve plate, giving an upward supporting force to the teas falling around, so that the teas are in a suspended critical state; driven by the conical sieve plate, the teas will fly towards the wall surface of the conical sieve plate and rotate along the wall surface, and then pass through the larger sieve holes and enter the collection chamber at the outer circumference of the conical sieve plate (the sieve holes smaller than the teas block the teas and prevent them from entering); by sequentially increasing the rotation speed of the motor, the teas can sequentially rotate along the wall surface within the height ranges of three different-sized sieve holes on the wall surface of the conical sieve plate and pass through the three sieve holes in sequence to separate three specifications of teas: one bud with one leaf, one bud with two leaves, and one bud with three leaves; the separated teas fall into the corresponding collection chambers, and the cleaning structure in the collection chambers then sweeps the teas to the discharge ports in each collection chamber and then enters the collection box for collection.

[0004] The above-mentioned centrifugal special high-quality famous tea grading machine described in the prior art grades teas by controlling the rotation speed of the motor so that different-sized teas pass through different-sized pores. However, this grading device needs to control the motor to maintain different rotation speeds during actual use, which is rather troublesome in operation. More importantly, this device has only one conical sieve plate, and the actual rotation situation of the teas inside the conical sieve plate cannot be precisely controlled. Therefore, during the grading process, there may be a situation where smaller-sized teas are blown up and pass through the larger sieve holes and fall into the corresponding collection chambers, resulting in a poor actual grading effect of the final teas. Summary of the Utility Model

[0005] The present utility model aims to provide a tea grading device, mainly to solve the technical problem existing in the prior art that during the grading process, tea leaves with smaller sizes may be blown up and fall into the corresponding collection chamber through larger sieve holes, resulting in a poor actual grading effect of the final tea leaves.

[0006] To solve the above technical problem, the present utility model provides the following technical solutions:

[0007] A tea grading device includes a rotating cylinder. A motor for driving the rotating cylinder to rotate is coaxially and detachably fixed to the outer bottom of the rotating cylinder. Inside the rotating cylinder, several levels of screening cylinders are coaxially and detachably fixed in sequence from outside to inside. A gap is maintained between adjacent screening cylinders. Sieve holes are distributed on the screening cylinders, and the pore diameters of the sieve holes on several levels of screening cylinders arranged from outside to inside increase in sequence.

[0008] When the rotating cylinder rotates, the included angle between the axis line of the rotating cylinder and the vertical direction is greater than 0°.

[0009] A housing for supporting the rotating cylinder is sleeved outside the rotating cylinder. The motor is fixed on the housing. A receiving groove for accommodating the rotating cylinder is opened on the housing. A number of balls in contact with the outer wall of the rotating cylinder are equidistantly distributed on the inner wall of the receiving groove. The balls are embedded in the inner wall of the receiving groove and are rotatably connected to the inner wall of the receiving groove.

[0010] From outside to inside, a first threaded groove for accommodating the next-level screening cylinder is opened at the bottom of each level of screening cylinder. The bottom of the outer peripheral surface of the next-level screening cylinder is threadedly connected to the inner peripheral surface of the first threaded groove of the previous-level screening cylinder; a second threaded groove for accommodating the screening cylinder closest to the outermost level is opened at the bottom of the rotating cylinder, and the inner peripheral surface of the second threaded groove is threadedly connected to the bottom of the outer peripheral surface of the screening cylinder closest to the outermost level.

[0011] The working principle and beneficial effects of the present utility model:

[0012] Place the tea leaves in the screening cylinder closest to the center. Start the motor. The motor drives the rotating cylinder to start rotating, thereby driving several levels of screening cylinders inside the rotating cylinder to start rotating. Under the action of centrifugal force, the tea leaves approach the wall surface of the screening cylinder. The tea leaves with smaller sizes pass through the sieve holes and enter the next-level screening cylinder. Based on this principle, by controlling the sizes of the sieve holes on several levels of screening cylinders, tea leaves of different sizes are graded. After grading, the rotating cylinder and the screening cylinders inside the rotating cylinder can be disassembled separately, and then the tea leaves in the corresponding screening cylinders can be poured out. And if there is a situation where tea leaves are stuck in the sieve holes and are not easy to take out, just tap the outer wall of the screening cylinder to shake off the stuck tea leaves.

[0013] Compared with the prior art solution of only setting a conical sieve plate, this solution has the following beneficial effects:

[0014] 1. This solution sets up several coaxially fixed screening cylinders to classify tea leaves. There is no need to control the speed of the motor. With a constant speed, the tea leaves are driven by centrifugal force to approach the wall of the screening cylinder and be classified. In terms of equipment control, it is simpler to operate than the existing centrifugal special premium tea leaf grading machine.

[0015] 2. In this solution, the tea leaves are mainly classified by the size of the sieve holes, and the grading effect of the tea leaves can be precisely controlled. Larger tea leaves cannot pass through the sieve holes and enter the next-level screening cylinder. Compared with the existing technology, the grading effect of this solution is better.

[0016] In summary, this solution as a whole solves the technical problem existing in the prior art that during the grading process, there may be a situation where smaller tea leaves are blown up and fall into the corresponding collection chamber through larger sieve holes, resulting in a poor actual grading effect of the final tea leaves.

[0017] 3. In this solution, the function of the housing is to support the entire device on the working plane. The function of setting the ball bearings on the inner wall of the receiving groove is to reduce the friction between the rotating cylinder and the inner wall of the receiving groove, so that the rotating cylinder can rotate at a high speed relative to the housing.

[0018] 4. In this solution, the screening cylinder closest to the outermost level is detachably connected to the rotating cylinder, and adjacent screening cylinders are also detachably connected.

[0019] Preferably, the opening direction of the receiving groove is the same as that of the rotating cylinder, and a groove cover for sealing the opening of the rotating cylinder is rotatably connected to the housing near the opening of the receiving groove. The side of the groove cover close to the rotating cylinder is in sliding contact with the edge of the opening of the rotating cylinder. In this solution, the function of the groove cover is to seal the opening of the rotating cylinder to prevent the tea leaves from flying out of the opening of the rotating cylinder during the rotation of the rotating cylinder. At the same time, the contact between the edge of the opening of the rotating cylinder and the groove cover can prevent the tea leaves in different gaps from being mixed together.

[0020] Preferably, a locking support rod that can press the surface of the groove cover after rotation is rotatably connected to the side of the housing close to the groove cover. The locking support rod is L-shaped, and one end of the locking support rod is rotatably connected to the housing, and the other end keeps a distance from the surface of the housing. In this solution, after the locking support rod rotates, one end can press the surface of the groove cover to prevent the groove cover from opening during the operation of the device.

[0021] Preferably, a frame standing on the ground is provided below the housing. The frame includes a bottom plate in contact with the ground. There is a gap between the bottom of the housing and the bottom plate. At both ends of the upper surface of the bottom plate, support plates are vertically fixed respectively. The two support plates are located on both sides of the housing adjacent to the opening direction of the receiving groove and are rotatably connected to the side surface of the housing. On the side of the housing opposite to the opening of the receiving groove, a cylinder is hinged. The end of the cylinder away from the housing is hinged to the bottom plate. In this solution, the two support plates are rotatably connected to the housing, and the frame supports the housing and separates it from the ground, giving the housing a certain rotation space. The cylinder at the rear of the housing controls the deflection angle of the housing freely through telescoping. When putting in tea leaves, the cylinder shortens, controlling the opening of the receiving groove of the housing to deflect upward. The operator puts the tea leaves into the innermost screening cylinder. After closing the groove cover, the cylinder extends, making the axis line of the rotating cylinder horizontally set. Then start the motor to drive the internal rotating cylinder to start rotating. Under the action of gravity and the rotational friction force in the screening cylinder, the tea leaves are graded. After grading, start the cylinder to shorten, making the opening of the housing receiving groove tilt upward. The operator opens the groove cover and can rotatably take out each stage of the screening cylinder and the rotating cylinder, take out the screening cylinder and the rotating cylinder, and pour out the correspondingly screened tea leaves.

[0022] Preferably, the motor is embedded inside the housing. The output shaft of the motor is inserted into the bottom of the receiving groove, and at one end of the output shaft of the motor located inside the receiving groove, a spline gear is coaxially fixed. A spline groove matching the spline gear is opened at the bottom of the outer side of the rotating cylinder. In this solution, when the rotating cylinder needs to be installed into the receiving groove, just embed the rotating cylinder into the receiving groove and insert the spline gear at the bottom of the receiving groove into the spline groove. The disassembly and assembly are simple. The motor relies on the matching of the spline gear and the spline groove to transmit torque to the rotating cylinder to make the rotating cylinder rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structure diagram of a tea grading device of the utility model patent;

[0024] Figure 2 is a three-dimensional structure diagram of a tea grading device of the utility model patent;

[0025] Figure 3 is a top view of a tea grading device of the utility model patent;

[0026] Figure 4 is a Figure 3 sectional view of a tea grading device of the utility model patent;

[0027] Figure 5 is a Figure 4 magnified view at B of a tea grading device of the utility model patent;

[0028] Figure 6 is an exploded view of a tea grading device of the utility model patent;

[0029] Figure 7 This is a three-dimensional structural diagram of the housing of a tea grading device for the utility model patent.

[0030] The reference numerals in the attached drawings of the specification include: bottom plate 11, support plate 12, housing 2, receiving groove 21, ball 211, rotating cylinder 31, screening cylinder 32, groove cover 4, locking support rod 5, cylinder 6, motor 7, spline gear 71. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0032] As Figure 1-7 shown, a tea grading device includes a frame standing on the ground. The frame includes a bottom plate 11 in contact with the ground. At both ends of the upper surface of the bottom plate 11, support plates 12 are vertically fixed respectively. A housing 2 is hinged between the two support plates 12. The specific hinging method is as follows: rotating shafts are fixed at both ends of the housing 2. Grooves are opened above the support plates 12 for accommodating the rotating shafts. The housing 2 can rotate around the rotating shafts. At the same time, when the device needs to be repaired, it is also convenient to take out the rotating shafts from the grooves above the support plates 12, so as to remove the housing 2 from the frame; A cylinder 6 is hinged to the rear side of the housing 2. The end of the cylinder 6 far from the housing 2 is hinged to the bottom plate 11. The specific hinging method is as Figure 1 shown. A set of ear plates are respectively fixed on the bottom plate 11 and the rear side of the housing 2. Both ends of the cylinder 6 are respectively hinged to the ear plates. The two support plates 12 are rotatably connected to the housing 2, and the frame supports the housing 2 and separates it from the ground, giving the housing 2 a certain rotation space. The cylinder 6 behind the housing 2 freely controls the deflection angle of the housing 2 by telescoping.

[0033] As Figure 6As shown, a receiving groove 21 is formed in the front side of the housing 2, and a motor 7 is embedded inside the housing 2. The output shaft of the motor 7 is inserted into the bottom of the receiving groove 21, and a spline gear 71 is coaxially welded to one end of the output shaft of the motor 7 located inside the receiving groove 21. A screening assembly for screening tea leaves is arranged in the receiving groove 21. The screening assembly includes a rotating cylinder 31. A spline groove matching the spline gear 71 is formed in the outer bottom side of the rotating cylinder 31. When the rotating cylinder 31 needs to be assembled in the receiving groove 21, the rotating cylinder 31 is directly placed in the receiving groove 21 and the spline gear 71 is embedded in the spline groove. The motor 7 relies on the matching of the spline gear 71 and the spline groove to transmit torque to the rotating cylinder 31 to make the rotating cylinder 31 rotate. When the rotating cylinder 31 rotates, the axis line of the rotating cylinder 31 is horizontally arranged. A number of balls 211 in contact with the outer wall of the rotating cylinder 31 are equidistantly distributed on the inner wall of the receiving groove 21. The balls 211 are embedded in the inner wall of the receiving groove 21 and are rotatably connected to the inner wall of the receiving groove 21, providing a certain supporting force for the rotating cylinder 31 while reducing the frictional resistance between the rotating cylinder 31 and the inner wall of the receiving groove 21 when the rotating cylinder 31 rotates.

[0034] As Figure 4 , 5 , 6 shows that a number of screening cylinders 32 are coaxially and detachably fixed inside the rotating cylinder 31 from outside to inside in sequence. Specifically, as Figure 5 shown, from outside to inside, a second thread groove is formed at the bottom of the rotating cylinder 31. The inner peripheral surface of the second thread groove is threadedly connected to the bottom outer peripheral surface of the outermost stage of the screening cylinder 32. A first thread groove for accommodating the next stage of the screening cylinder 32 is formed at the bottom of each stage of the screening cylinder 32. The bottom outer peripheral surface of the next stage of the screening cylinder 32 is threadedly connected to the inner peripheral surface of the first thread groove of the previous stage of the screening cylinder 32. A gap is maintained between adjacent screening cylinders 32. Sieve holes are distributed on the screening cylinders 32. The aperture diameters of the sieve holes on the number of screening cylinders 32 arranged from outside to inside increase in sequence. The tea leaves are placed in the screening cylinder 32 closest to the center. The motor 7 is started, and the motor 7 drives the rotating cylinder 31 to start rotating, thereby driving the number of screening cylinders 32 inside the rotating cylinder 31 to start rotating. Under the action of centrifugal force, the tea leaves approach the wall surface of the screening cylinder 32. The tea leaves with smaller sizes pass through the sieve holes and enter the next stage of the screening cylinder 32. After grading, the rotating cylinder 31 and the screening cylinders 32 inside the rotating cylinder 31 can be disassembled respectively, and then the tea leaves in the corresponding screening cylinders 32 are poured out. And if there is a situation where the tea leaves are stuck in the sieve holes and are not easy to take out, the outer wall of the screening cylinder 32 is knocked to shake off the stuck tea leaves.

[0035] As Figure 1As shown in the figure, a trough cover 4 for sealing the opening of the rotary drum 31 is rotatably connected to the housing 2 near the opening of the receiving trough 21. A connecting portion extends from one side of the trough cover 4, and a U-shaped connecting rod passes through the middle of the connecting portion. Both ends of the connecting rod are fixedly connected to the housing 2, so that the housing 2 and the trough cover 4 are rotatably connected. The side of the trough cover 4 close to the rotary drum 31 is in sliding contact with the edge of the opening of the rotary drum 31, preventing the tea leaves from flying out of the opening of the rotary drum 31 during the rotation of the rotary drum 31. At the same time, the contact between the edge of the opening of the rotary drum 31 and the trough cover 4 can prevent the tea leaves in different gaps from being mixed together; a locking support rod 5 is rotatably connected to the side of the housing 2 close to the trough cover 4. After rotation, it can press the surface of the trough cover 4. The locking support rod 5 is L-shaped, and one end of the locking support rod 5 is rotatably connected to the housing 2, and there is a certain damping at the relative rotating part between the two, so that the locking support rod 5 can be fixed at a certain angle after rotation. The other end of the locking support rod 5 keeps a distance from the surface of the housing 2. After rotation, the end of the locking support rod 5 that keeps a distance from the housing 2 can press the surface of the trough cover 4, preventing the trough cover 4 from opening during the operation of the device.

[0036] As can be seen from the above, the specific implementation manner of the present utility model is as follows:

[0037] When putting in the tea leaves, the air cylinder 6 shortens, controlling the opening of the receiving trough 21 of the housing 2 to deflect upward. The operator puts the tea leaves into the innermost screening cylinder 32; closes the trough cover 4, the air cylinder 6 elongates, so that the axis line of the rotary drum 31 is horizontally arranged, and the motor 7 is started to drive the internal rotary drum 31 to start rotating. Under the action of gravity and the rotational friction force in the screening cylinder 32, the tea leaves with smaller sizes pass through the sieve holes and enter the next-level screening cylinder 32 for grading; after grading, the air cylinder 6 is started to shorten, so that the opening of the receiving trough 21 of the housing 2 is inclined upward, and the included angle between the axis line of the rotary drum 31 and the vertical direction is 60°. The operator opens the trough cover 4, and can rotatably take out each-level screening cylinder 32 and the rotary drum 31, take out the screening cylinder 32 and the rotary drum 31, and pour out the correspondingly screened tea leaves. And if there is a situation where the tea leaves are stuck in the sieve holes and are not easy to take out, just knock on the outer wall of the screening cylinder 32 to shake off the stuck tea leaves.

[0038] The above are only the embodiments of the present utility model. Common general knowledge such as the specific structures and characteristics in the solutions is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A tea grading device, characterized in that: It comprises a rotating drum, a motor for driving the rotating drum is coaxially and detachably fixed on the outer bottom of the rotating drum, a plurality of screening drums are coaxially and detachably fixed in the rotating drum from the outside to the inside, gaps are maintained between adjacent screening drums, screening holes are distributed on the screening drum, and the apertures of the screening holes on the plurality of screening drums arranged from the outside to the inside increase in sequence; When the drum rotates, the angle between the axis of the drum and the vertical direction is greater than 0°; The outer shell of the drum is provided with a shell for supporting the drum, the motor is fixed on the shell, the shell is provided with a receiving groove for receiving the drum, a plurality of balls in contact with the outer wall of the drum are evenly distributed on the inner wall of the receiving groove, the balls are embedded in the inner wall of the receiving groove and are rotatably connected to the inner wall of the receiving groove; From outside to inside, a first thread groove for accommodating the next-stage screening cylinder is provided at the bottom of each stage of the screening cylinder, and the bottom of the outer circumference of the next-stage screening cylinder is threadedly connected to the inner circumference of the first thread groove of the previous-stage screening cylinder; a second thread groove for accommodating the screening cylinder close to the outermost stage is provided at the bottom of the rotating drum, and the inner circumference of the second thread groove is threadedly connected to the bottom of the outer circumference of the screening cylinder close to the outermost stage.

2. A tea grading device according to claim 1, characterized in that: The opening direction of the receiving slot is consistent with the opening direction of the drum, and a slot cover for sealing the opening of the drum is rotatably connected to the housing near the opening of the receiving slot, and a side of the slot cover close to the drum is in sliding contact with the edge of the drum opening.

3. A tea grading device according to claim 2, characterized in that: A locking support rod is rotatably connected on one side of the shell close to the slot cover and can press the surface of the slot cover after rotation. The locking support rod is L-shaped, and one end of the locking support rod is rotatably connected to the shell, and the other end maintains a distance from the shell surface.

4. A tea grading device according to claim 3, characterized in that: A frame standing on the ground is arranged below the shell, and the frame includes a bottom plate in contact with the ground, the bottom of the shell is spaced apart from the bottom plate, and support plates are vertically fixed at both ends of the upper surface of the bottom plate, and the two support plates are respectively located on both sides of the shell adjacent to the opening direction of the accommodating groove and are rotatably connected to the side surface of the shell; a cylinder is hinged on the side of the shell opposite to the opening of the accommodating groove, and the end of the cylinder away from the shell is hinged to the bottom plate.

5. A tea grading device according to claim 4, characterized in that: The motor is embedded in the shell, the output shaft of the motor is inserted into the bottom of the receiving groove, and a spline gear is coaxially fixed to one end of the motor output shaft located inside the receiving groove, and a spline groove matching the spline gear is opened at the bottom of the outer side of the rotating drum.

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