Novel tea screening and grading machine

Abstract

A novel tea screening and grading machine comprises a machine frame, a conveyor, a round hole sieve, a bottom sieve and a control panel, the conveyor is fixedly connected to the front end of the machine frame, the round hole sieve is lower than the conveyor and fixedly connected to a rotating frame, the rotating frame is movably connected with the machine frame and drives screening through a rotating motor, an inlet of the round hole sieve is high, and the bottom sieve is arranged on the bottom sieve. The outlet is low, an outlet of the conveyor is aligned with an inlet of the round hole sieve, and the bottom sieve is located below the round hole sieve and arranged in the mode that the front portion is high and the rear portion is low. According to the novel tea screening and grading machine, winnowing and screening are ingeniously combined, the round hole screen capable of adjusting the screening frequency, the bottom screen capable of conducting secondary winnowing and filtering fragments and the fan system capable of accurately controlling the air speed are arranged, and the problems that a traditional tea screening and grading machine is not thorough in winnowing, low in screening efficiency and poor in impurity removing effect are effectively solved; the high efficiency, uniformity and cleanliness of tea leaf screening and grading are achieved, and the tea leaf quality and the production efficiency are remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of tea screening equipment, in particular to a novel tea screening and grading machine. Background Art

[0002] Traditional tea screening and grading machines use a single-stage air separation method, which doesn't achieve the cleanest possible results. Some tea grading machines use multi-stage air separation, where gravity and wind force separate tea leaves into different grades based on their proximity to the falling point. Using multiple gates to separate tea leaves by size isn't very effective. Another method is a vibrating screen, which uses vibration to filter tea leaves down the chute, resulting in multiple grades. However, this method is inefficient and doesn't remove impurities. This new tea grading and screening machine combines air separation and sieving, achieving high efficiency, excellent results, and a uniform, clean, and impurity-free environment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a novel tea screening and grading machine.

[0004] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0005] A new type of tea screening and grading machine includes a frame, a conveyor, a round hole screen, a bottom screen and a control panel. The conveyor is fixed to the front end of the frame, the round hole screen is lower than the height of the conveyor and is fixed to the rotating frame. The rotating frame is movably connected to the frame and drives the screening by a rotating motor. The entrance of the round hole screen is high and the exit is low, and the exit of the conveyor is aligned with the entrance of the round hole screen. The bottom screen is located below the round hole screen, with a high front and low back setting.

[0006] A conveying backsweeper is provided at the rear end outlet of the conveyor for smoothing the tea leaves.

[0007] A screen surface discharge port is provided at the rear end outlet of the circular hole screen.

[0008] A bottom screen outlet is provided at the rear end outlet of the bottom screen.

[0009] A first fan is provided at a position where the rear end outlet of the conveyor is aligned with the inlet of the round hole screen.

[0010] A secondary air inlet is provided below the bottom screen outlet, and a second fan is provided at the second air inlet.

[0011] The bottom screen sliding surface is also provided with debris filtering holes.

[0012] The control panel is fixed to the side of the frame and is electrically connected to the controller inside the frame.

[0013] The controller is electrically connected to the rotary motor and can control the rotary motor to drive the screening frequency of the circular hole screen.

[0014] The controller is electrically connected to the first fan and the second fan, and can control the wind speed of the first fan and the second fan.

[0015] The conveying backsweeper includes a rotating shaft and a plurality of flexible sweeping strips evenly distributed on the rotating shaft. The rotating shaft is driven to rotate by a motor. The motor is electrically connected to the controller, and its rotation speed is controlled by the controller to adapt to the smoothing requirements of different types of tea.

[0016] The screening method of the screening and grading machine is as follows: the conveyor transports the tea leaves to be screened evenly, and the outlet at the rear end of the conveyor is aligned with the inlet of the round hole screen. The first fan generates wind force, and the tea leaves, under the combined action of wind force and gravity, fall at different distances according to their own weight and the degree of influence of wind force, and are preliminarily graded and some lighter impurities such as dust and old leaves are removed; then the tea leaves enter the round hole screen with a high inlet and a low outlet, and the rotating motor drives the rotating frame to drive the round hole screen for screening. The tea leaves with larger screen surface remain on the round hole screen and flow out from the screen surface outlet, while the tea leaves with uniform size remain on the round hole screen. The leaves pass through the round hole sieve and fall onto the bottom sieve with a high front and a low back, completing the first screening; tea leaves of uniform size slide on the bottom sieve, and debris and particles leak through the debris filtering holes on the sliding surface of the bottom sieve to achieve the second screening; the tea leaves flowing out from the rear end outlet of the bottom sieve are subjected to a second air separation by the wind force generated by the second fan below the bottom sieve outlet to further remove residual impurities, and finally obtain clean, impurity-free, and uniform-sized genuine tea leaves. At the same time, the conveyor speed, fan speed and round hole sieve screening frequency can be adjusted through the control panel to meet different screening needs.

[0017] Beneficial effects of the present invention:

[0018] This new tea screening and grading machine cleverly combines air separation and screening, and is equipped with a round hole screen with adjustable screening frequency, a bottom screen that can perform secondary air separation and filter debris, and a fan system that can accurately control the wind speed. It effectively solves the problems of traditional tea screening and grading machines such as incomplete air separation, low screening efficiency, and poor impurity removal. It achieves high efficiency, uniformity, and cleanliness in tea screening and grading, significantly improving tea quality and production efficiency.

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the bottom screen of the present invention.

[0021] Figure 3 It is the front view of the present invention.

[0022] Among them, 1-frame; 2-conveyor; 3-round hole screen; 4-bottom screen; 5-control panel; 6-rotating frame; 7-conveying backsweeper; 8-screen surface discharge port; 9-bottom screen outlet; 10-first fan; 11-secondary air inlet; 12-second fan; 13-debris filter hole. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0024] A new type of tea screening and grading machine includes a frame 1, a conveyor 2, a round hole screen 3, a bottom screen 4 and a control panel 5. The conveyor 2 is fixedly connected to the front end of the frame 1. The round hole screen 3 is lower than the height of the conveyor 2 and is fixedly connected to the rotating frame 6. The rotating frame 6 is movably connected to the frame 1 and drives the screening by a rotating motor. The entrance of the round hole screen 3 is high and the exit is low, and the exit of the conveyor 2 is aligned with the entrance of the round hole screen 3. The bottom screen 4 is located below the round hole screen 3, with a high front and low back setting.

[0025] A conveyor backsweeper 7 is provided at the rear end outlet of the conveyor 2 for smoothing the tea leaves.

[0026] A screen surface discharge port 8 is provided at the rear end outlet of the circular hole screen 3 .

[0027] A bottom screen outlet 9 is provided at the rear end outlet of the bottom screen 4 .

[0028] A first fan 10 is provided between the rear end outlet of the conveyor 2 and the aligned position of the inlet of the round hole screen 3 .

[0029] A secondary air port 11 is provided below the outlet of the bottom screen 4 , and a second fan 12 is provided at the second air port 11 .

[0030] There are also debris filtering holes 13 on the sliding surface of the bottom screen 4.

[0031] The control panel 5 is fixed to the side of the rack 1 , and the control panel 5 is electrically connected to the controller inside the rack 1 .

[0032] The controller is electrically connected to the rotary motor and can control the rotary motor to drive the screening frequency of the circular hole screen 3 .

[0033] The controller is electrically connected to the first fan 10 and the second fan 12 , and can control the wind speeds of the first fan 10 and the second fan 12 .

[0034] The conveying back sweeper 7 includes a rotating shaft and a plurality of flexible sweeping strips evenly distributed on the rotating shaft. The rotating shaft is driven to rotate by a motor. The motor is electrically connected to the controller, and its speed is controlled by the controller to adapt to the smoothing requirements of different types of tea.

[0035] The implementation principle of the present invention is as follows: In the initial stage of operation of the tea screening and grading machine, the conveyor 2 evenly transports the tea leaves to be screened through the conveyor retracement device 7. A first fan 10 is provided between the rear end outlet of the conveyor 2 and the inlet alignment position of the round hole screen 3. When the tea leaves fall from the rear end outlet of the conveyor 2, the wind force generated by the first fan 10 is utilized. Under the combined action of wind force and gravity, the tea leaves will fall at different distances depending on their own weight and the degree to which they are affected by the wind force. Lighter impurities such as dust and old leaves will be blown farther by the wind, thereby being preliminarily separated from the tea leaves. In this way, the tea leaves are preliminarily graded, preparing for the subsequent screening by the round hole screen 3 and the bottom screen 4, while also removing some lighter impurities. The tea leaves then enter the circular sieve 3, which is fixed to a rotating frame 6, which is movably connected to the frame 1 and driven by a rotating motor. The circular sieve 3 has a high inlet and a low outlet. During the screening process, tea leaves with large screen surface areas remain on the circular sieve 3 and flow out through the screen surface discharge port 8 at the rear end of the circular sieve 3. Tea leaves of uniform size pass through the circular sieve 3 and fall onto the bottom sieve 4 below, completing the first screening. The bottom sieve 4 is arranged with a high front and a low back. Its sliding surface is provided with debris filtering holes 13. As the uniformly sized tea leaves slide on the bottom sieve 4, debris and particulate matter will leak through the debris filtering holes 13, completing the second screening.

[0036] After two round-hole sieves and a bottom sieve 4, the tea leaves are initially sorted by size. The tea leaves flowing out of the bottom sieve outlet 9 at the rear end of the bottom sieve 4 are filtered through the debris filter holes 13 on the sliding surface of the bottom sieve 4 before entering the bottom sieve outlet. A secondary air port 11 is provided below the bottom sieve outlet 4. A second fan 12 is provided at the secondary air port 11. The wind generated by the second fan 12 is used to perform a second air separation on the tea leaves. This air separation further removes impurities remaining in the tea leaves, ensuring that the resulting finished tea leaves are clean, free of impurities, and uniform in size, meeting the desired screening requirements. A control panel 5 is fixed to the side of the frame 1 and electrically connected to a controller within the frame 1. The controller is electrically connected to the rotary motor, the first fan 10, and the second fan 12, respectively. The controller controls the frequency of the round-hole sieve 3 driven by the rotary motor, as well as the wind speed of the first fan 10 and the second fan 12. By adjusting the conveying speed, air separation intensity, and screening speed and frequency of the conveyor 2, these components are coordinated to meet the screening requirements of different tea leaves, improving production efficiency and screening quality.

[0037] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of tea screening and grading machine, characterized in that: It includes a frame, a conveyor, a round hole screen, a bottom screen and a control panel. The conveyor is fixedly connected to the front end of the frame. The round hole screen is lower than the height of the conveyor and is fixedly connected to the rotating frame. The rotating frame is movably connected to the frame and drives the screening by a rotating motor. The entrance of the round hole screen is high and the exit is low, and the exit of the conveyor is aligned with the entrance of the round hole screen. The bottom screen is located below the round hole screen, with a high front and a low back setting.

2. The novel tea screening and grading machine according to claim 1 is characterized in that: A conveyor retracement device is provided at the rear end outlet of the conveyor. The conveyor retracement device includes a rotating shaft and a plurality of flexible sweeping strips evenly distributed on the rotating shaft. The rotating shaft is driven to rotate by a motor. The motor is electrically connected to a controller inside the frame, and its speed is controlled by the controller.

3. The novel tea screening and grading machine according to claim 1 is characterized in that: A screen surface discharge port is provided at the rear end outlet of the round hole screen for discharging large tea leaves on the screen surface.

4. The novel tea screening and grading machine according to claim 1 is characterized in that: A bottom sieve outlet is provided at the rear end outlet of the bottom sieve for discharging the sieved tea leaves.

5. The novel tea screening and grading machine according to claim 1 is characterized in that: A first fan is provided at a position where the rear end outlet of the conveyor is aligned with the inlet of the round hole screen, for performing preliminary air separation and classification on the tea leaves and removing some lighter impurities.

6. The novel tea screening and grading machine according to claim 1 is characterized in that: A secondary air port is provided below the bottom sieve outlet, and a second fan is provided at the secondary air port for performing secondary air separation on the tea leaves flowing out of the rear end outlet of the bottom sieve to further remove residual impurities.

7. The novel tea screening and grading machine according to claim 1 is characterized in that: The bottom sieve sliding surface is provided with debris filtering holes for filtering debris and particles in the tea leaves.

8. The novel tea screening and grading machine according to claim 1 is characterized in that: The control panel is fixed to the side of the frame, and is electrically connected to the controller inside the frame. The controller is electrically connected to the rotating motor and can control the screening frequency of the circular hole screen driven by the rotating motor; the controller is also electrically connected to the first fan and the second fan and can control the wind speed of the first fan and the second fan.

9. The novel tea screening and grading machine according to claim 2, characterized in that: The flexible sweeping strip is made of rubber or plastic and is used to smooth tea leaves to meet the smoothing requirements of different types of tea leaves.

10. The novel tea screening and grading machine according to any one of claims 1 to 9, characterized in that: The screening method of the screening and grading machine is as follows: the conveyor transports the tea to be screened evenly, and when the rear end outlet of the conveyor is aligned with the round hole screen inlet, the first fan generates wind, and the tea is preliminarily graded and some lighter impurities are removed under the combined action of wind and gravity; then the tea enters the round hole screen, and the rotating motor drives the rotating frame to drive the round hole screen for screening. The tea leaves with large screen surface remain on the round hole screen and flow out from the screen surface discharge port, and the tea leaves with uniform size pass through the round hole screen and fall onto the bottom screen below to complete the first screening; the tea leaves with uniform size slide on the bottom screen, and the debris and particulate matter leak out through the debris filtering holes on the sliding surface of the bottom screen to achieve the second screening; the tea leaves flowing out from the rear end outlet of the bottom screen are subjected to the second air separation by the wind generated by the second fan below the bottom screen outlet, and finally clean, impurity-free, and uniform-sized genuine tea leaves are obtained. At the same time, the conveyor speed, fan speed and round hole screen screening frequency can be adjusted through the control panel to meet different screening needs.

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