A drum-type tea screening and drying machine

Abstract

The present invention relates to the technical field of tea drying, and more particularly to a drum-type tea screening and drying machine, comprising a drying outer box, wherein a ventilation cylinder is coaxially arranged inside the drying outer box, an end box is coaxially fixedly mounted at one end of the drying outer box, a ventilation pipe is installed through the end box and the drying outer box at one end away from each other, an annular cylinder is mounted on the upper surface of the drying outer box, a rotatable sealing cylinder is coaxially mounted inside the annular cylinder, two partitions are mounted inside the annular cylinder and outside the sealing cylinder, a large cavity and a small cavity are formed between the two partitions, the annular cylinder and the sealing cylinder. The present invention can alternately connect the large cavity and the small cavity through the lower end of the bending tube, and the ventilation pipe located on one side of the end box has a longer time to introduce hot air, while the hot air injected from the other end of the drying outer box has a shorter time to introduce hot air, so that the tea leaves move back and forth in the drying outer box while the whole moves toward the side of the discharge pipe, ensuring that the length of the drying outer box does not need to be too long to complete the drying process of the tea leaves.

Description

Technical Field

[0001] The invention relates to the technical field of tea drying, in particular to a drum-type tea screening and drying machine. Background Art

[0002] Tea processing, also known as tea making, is the process of making fresh tea leaves through various processing steps into various semi-finished or finished teas. Drying is a very important step, which is to separate the moisture in the tea leaves through heat to facilitate the subsequent processing of the tea.

[0003] Chinese patent CN107624892A, a high-efficiency drum-type tea dryer, includes a base, a sleeve is provided in the middle of the base, the left and right ends of the sleeve are fixed to the base by brackets, a drum is installed in the sleeve, a sandwich is formed between the drum and the sleeve, the sandwich is filled with granular desiccant, and the inner wall of the drum is evenly provided with air holes connected to the sandwich. This invention provides a high-efficiency drum-type tea dryer with a novel structure; the invention cleverly arranges a drying mechanism and a dynamic water absorption system, and has high drying efficiency. In addition, the invention cleverly arranges a discharging mechanism, which is convenient for discharging and screening and removing impurities at the same time.

[0004] The above-mentioned related technologies have the following drawbacks: in the existing technology, tea leaves are moved and dried by hot air, and the tea leaves follow the hot air in a one-way flow. Complete drying requires a sufficient length of box, which takes up a large space. To this end, a drum-type tea screening and drying machine is proposed. Summary of the Invention

[0005] In order to reduce the length of equipment required for complete drying of tea leaves, the present invention provides a drum-type tea screening and drying machine.

[0006] The present invention provides a drum-type tea screening and drying machine, which adopts the following technical scheme: it includes a drying outer box, a ventilation cylinder is coaxially arranged on the inner side of the drying outer box, an end box is coaxially fixedly installed at one end of the drying outer box, and ventilation pipes are installed through the end of the end box and the drying outer box away from each other, an annular cylinder is installed on the upper surface of the drying outer box, two ventilation pipes are installed through the outer annular surface of the annular cylinder at one end close to each other, a rotatable sealing cylinder is coaxially installed inside the annular cylinder, a bending pipe is installed on the inner side of the annular cylinder, the lower end of the bending pipe is installed through the inner annular surface of the sealing cylinder, and a relatively rotatable air supply pipe A is sleeved on the upper end of the bending pipe, and the air supply pipe A is fixed to the annular cylinder, and two partitions are installed inside the annular cylinder and on the outside of the sealing cylinder, a large cavity and a small cavity are formed between the two partitions, the annular cylinder and the sealing cylinder, the ventilation pipe connected to the end box is connected to the large cavity, and the other ventilation pipe is connected to the small cavity.

[0007] A rotatable twist cylinder is coaxially inserted between the end box and the drying outer box, the air cylinder is coaxially fixedly connected to the twist cylinder, a breathable tea sliding plate is fixedly installed inside the end box, the upper surface of the end box is open at the breathable tea sliding plate, and the drying outer box is connected to the end away from the end box and is equipped with a discharge pipe.

[0008] Optionally, a motor A is installed on the upper surface of the drying outer box, the lower end of the bending tube is horizontal, the upper end of the bending tube is vertical, and the output end of the motor A is fixed to the horizontal end of the bending tube.

[0009] Optionally, a ventilation pipe connected to the drying outer box is connected to a jet disc installed thereon. The jet disc is located at the discharge pipe and is notched. The side of the jet disc close to the end box is air-permeable.

[0010] Optionally, a motor B is installed on the bottom surface of the drying outer box, and the output end of the motor B and the outer ring surface of the torsion barrel are driven by a chain.

[0011] Optionally, an auxiliary gas filling pipe is coaxially arranged on the inner side of the ventilation cylinder, and an auxiliary gas outlet groove communicating with the inside and outside is opened on the outer annular surface of the auxiliary gas filling pipe. The auxiliary gas filling pipe is sealed at the end away from the end box, and the ventilation sliding plate can be rotatably sleeved on the outer surface of the auxiliary gas filling pipe. The ventilation pipe connected to the end box can be rotatably sleeved on the outer surface of the auxiliary gas filling pipe. A rotatable air supply pipe B is installed at one end of the auxiliary gas filling pipe located outside the end box. The air supply pipe B is fixedly connected to the end box. A rotatable transmission gear is installed on the lower surface of the end box. The transmission gear and the auxiliary gas filling pipe are driven by a conveyor belt. A driving gear is meshed with the lower side of the transmission gear, and the driving gear is coaxially fixedly sleeved on the output end of the motor B.

[0012] Optionally, the breathable tea sliding plate is tilted and contacts a rotatable tea-moving column close to the drying outer box. A plurality of evenly distributed tea-moving grooves are provided on the circumferential side of the tea-moving column. Both ends of the tea-moving column can be rotated to pass through the inner wall of the end box.

[0013] Optionally, the auxiliary gas outlet grooves are divided into multiple groups and evenly distributed on the surface of the auxiliary gas filling pipe. The auxiliary gas outlet grooves are arranged obliquely, and the extension lines of the auxiliary gas outlet grooves are misaligned with the axis of the auxiliary gas filling pipe.

[0014] Optionally, a plurality of ring frame structures are coaxially arranged on the outer ring side of the auxiliary gas filling pipe;

[0015] The ring frame structure includes a plurality of breathable bent plates and ring rods. The breathable bent plates are fixedly sleeved on the outer surface of the ring rods, and the breathable bent plates are fixed to the inner wall of the breathable cylinder through a vertical shaft rod.

[0016] Optionally, both left and right ends of the breathable bent plate are inclined, the distance between the left end of the breathable bent plate and the axis of the breathable tube is greater than the distance between the right end of the breathable bent plate and the axis of the breathable tube, the ring rod and the breathable tube are coaxially arranged, and the multiple breathable bent plates connected to the ring rod are evenly distributed along the axis of the breathable tube.

[0017] In summary, the present invention has the following beneficial technical effects:

[0018] The present invention provides components such as partitions, annular cylinders, large cavities and small cavities. When the bent tube rotates relative to the air supply tube A, the lower end of the bent tube is alternately connected to the large cavity and the small cavity, so that the two ventilation pipes are alternately filled with hot air from both ends of the drying outer box. The ventilation pipe located on one side of the end box takes a longer time to let in hot air. The hot air filled into the drying outer box drives the tea leaves on the surface of the breathable and smooth tea plate to move toward the side of the discharge pipe. The hot air filled from the other end of the drying outer box takes a shorter time. The filled hot air drives the tea leaves in the drying outer box to flow toward the side away from the discharge pipe, so that the tea leaves move back and forth left and right in the drying outer box and move toward the side of the discharge pipe as a whole, thereby increasing the drying time of the tea leaves in the drying outer box and ensuring that the length of the drying outer box does not need to be too long to complete the drying process of the tea leaves.

[0019] The present invention provides an auxiliary air-filling pipe, an auxiliary air outlet groove and other components, and drives the auxiliary air-filling pipe to rotate through a driving gear, a transmission gear and a conveyor belt. The air supply pipe B fills hot air into the auxiliary air-filling pipe, and the hot air in the auxiliary air-filling pipe is blown into the inner side of the air cylinder from the auxiliary air outlet groove. When the auxiliary air outlet groove follows the auxiliary air-filling pipe to rotate and eject air, it assists in driving the tea leaves between the auxiliary air-filling pipe and the air cylinder to rotate around, further increasing the movement trajectory of the tea leaves inside the air cylinder and improving the tea drying effect. At the same time, the auxiliary air outlet grooves at different positions replenish new hot air to different positions inside the air cylinder, preventing the temperature of the hot air from decreasing after a long contact time with the tea leaves, resulting in a slower and slower drying effect of the tea leaves.

[0020] The present invention provides a ventilation bending plate, which rotates with the ventilation cylinder. The ventilation bending plate can stir the tea leaves in the ventilation cylinder during rotation. At the same time, when the hot air pushes the tea leaves to approach the discharge pipe, the tea leaves gradually move away from the axis of the ventilation cylinder while sliding on the side of the ventilation bending plate away from the ventilation cylinder. When the hot air pushes the tea leaves to move away from the air outlet pipe, the tea leaves gradually move closer to the axis of the ventilation cylinder while sliding on the side of the ventilation bending plate close to the ventilation cylinder, so that the hot air can drive the tea leaves to move back and forth in the directions away from and close to the axis of the ventilation cylinder, thereby increasing the drying path of the tea leaves in the ventilation cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0022] Figure 2 1 is a schematic diagram of a top view of the structure in an embodiment of the present invention;

[0023] Figure 3 is a side structural schematic diagram of an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the drying outer box in an embodiment of the present invention;

[0025] Figure 5 It is a schematic front view of part of the structure in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the end box in an embodiment of the present invention;

[0027] Figure 7 This is a schematic structural diagram of the inner side of the ventilating cylinder in an embodiment of the present invention;

[0028] Figure 8 In the embodiment of the present invention Figure 7 A schematic diagram of the structure at center A;

[0029] Figure 9 Schematic diagram of the structure of the connection between the partition and the annular cylinder in an embodiment of the present invention.

[0030] Figure numerals: 1. Drying outer box; 2. Ring cylinder; 3. Ventilation pipe; 31. Jet disc; 4. Breathing cylinder; 41. Auxiliary air supply pipe; 42. Auxiliary air outlet trough; 43. Air supply pipe B; 44. Transmission gear; 45. Conveyor belt; 46. Driving gear; 47. Ring frame structure; 471. Breathable bending plate; 472. Ring rod; 473. Vertical axis rod; 5. End box; 6. Bending pipe; 7. Sealing cylinder; 8. Air supply pipe A; 9. Partition; 10. Large cavity; 11. Small cavity; 12. Twisting cylinder; 13. Breathable tea sliding plate; 131. Tea-moving column; 132. Tea-moving trough; 14. Discharge pipe; 15. Motor A; 16. Motor B; 17. Chain. DETAILED DESCRIPTION

[0031] The following is combined with Figures 1-9 The present invention is described in further detail.

[0032] The embodiment of the present invention discloses a drum-type tea screening and drying machine. Figures 1-9 As shown, it includes a drying outer box 1, and exhaust holes are installed on the outside of the drying outer box 1 to facilitate the discharge of water vapor generated after the tea leaves inside the drying outer box 1 are dried. A ventilation cylinder 4 is coaxially arranged on the inside of the drying outer box 1, and air holes for gas flow are opened on the circumferential surface of the ventilation cylinder 4. An end box 5 is coaxially fixedly installed at one end of the drying outer box 1, and a ventilation pipe 3 is installed through the end of the end box 5 and the drying outer box 1 away from each other. The ventilation pipe 3 connected to the drying outer box 1 is connected and installed with a jet disk 31. The jet disk 31 is located at the discharge pipe 14 in a notch shape, and the jet disk 31 is breathable on the side close to the end box 5. The jet disk 31 effectively prevents the hot air flow from driving the tea leaves into the ventilation pipe 3. At the same time, the jet disk 31 facilitates the ejected air flow to be evenly distributed on the end face of the ventilation cylinder 4.

[0033] An annular cylinder 2 is installed on the upper surface of the drying outer box 1, and two ventilation pipes 3 are close to each other at one end and penetrate the outer ring surface of the annular cylinder 2 respectively. A rotatable sealing cylinder 7 is coaxially installed inside the annular cylinder 2, and the sealing cylinder 7 and the annular cylinder 2 rotate coaxially relative to each other. A sealing gasket and other structures are installed between the sealing cylinder 7 and the annular cylinder 2 to increase the airtightness and prevent leakage when the sealing cylinder 7 rotates relative to the annular cylinder 2. A bending tube 6 is installed on the inside of the annular cylinder 2, and the lower end of the bending tube 6 is installed through the inner ring surface of the sealing cylinder 7.

[0034] A motor A15 is installed on the upper surface of the drying outer box 1. The lower end of the bending tube 6 is horizontal, and the upper end of the bending tube 6 is vertical. The output end of the motor A15 is fixed to the horizontal end of the bending tube 6. The bending tube 6 and the axis of the motor A15 are connected through a coupling. The motor A15 can drive the vertical end of the bending tube 6 to rotate coaxially with the drying outer box 1.

[0035] The upper end of the bending tube 6 is sleeved with an air supply pipe A8 that can rotate relatively. The air supply pipe A8 is fixed to the annular cylinder 2. Two partitions 9 are installed inside the annular cylinder 2 and on the outside of the sealing cylinder 7. A large cavity 10 and a small cavity 11 are formed between the two partitions 9 and the annular cylinder 2 and the sealing cylinder 7. The ventilation pipe 3 connected to the end box 5 is connected to the large cavity 10, and the other ventilation pipe 3 is connected to the small cavity 11. The arc angle of the large cavity 10 is greater than the arc angle of the small cavity 11. During the rotation of the bending tube 6, the time it is connected to the small cavity 11 is less than the time it is connected to the large cavity 10. The two ventilation pipes 3 are alternately filled with hot air from both sides of the drying outer box 1, and the ventilation pipe 3 on one side of the end box 5 has a longer time for hot air to be introduced. The hot air filled in the drying outer box 1 drives the tea leaves to move to the left, and the hot air filled from the other end of the drying outer box 1 has a shorter time. The hot air driven by the hot air drives the tea leaves in the drying outer box 1 to flow to the right, so that the tea leaves move back and forth left and right in the drying outer box 1 while moving as a whole toward the side of the discharge pipe 14.

[0036] A rotatable twist cylinder 12 is coaxially inserted between the end box 5 and the drying outer box 1, and the air cylinder 4 is coaxially fixedly connected to the twist cylinder 12. A motor B16 is installed on the bottom of the drying outer box 1, and the output end of the motor B16 and the outer ring surface of the twist cylinder 12 are transmitted through a chain 17. A sprocket that cooperates with the chain 17 is installed on the surface of the twist cylinder 12. A sprocket for chain 17 transmission is installed on the output end of the motor B16 and the outside of the twist cylinder 12. The sprocket and the output end of the motor B16 are connected by a pin key. Transmission through the chain 17 increases transmission efficiency compared to the conveyor belt.

[0037] An auxiliary air-filling pipe 41 is coaxially arranged on the inside of the air-venting cylinder 4, and an auxiliary air-filling groove 42 which is connected to the inside and outside is opened on the outer ring surface of the auxiliary air-filling pipe 41. The auxiliary air-filling groove 42 is evenly distributed on the surface of the auxiliary air-filling pipe 41 in multiple groups. The auxiliary air-filling groove 42 is tilted, and the extension line of the auxiliary air-filling groove 42 is misaligned with the axis of the auxiliary air-filling pipe 41, so that the direction of the airflow ejected from the auxiliary air-filling groove 42 is tilted with the axis of the air-venting cylinder 4. When the auxiliary air-filling pipe 41 drives the auxiliary air-filling groove 42 to rotate and eject the airflow, the rotating airflow drives the tea leaves to rotate around the auxiliary air-filling pipe 41, thereby increasing the moving path of the tea leaves in the air-venting cylinder 4, thereby increasing the drying effect of the tea leaves. At the same time, the auxiliary air-filling grooves 42 at different positions replenish new hot air to different positions inside the air-venting cylinder 4, to prevent the hot air from decreasing in temperature as the moving trajectory in the air-venting cylinder 4 increases, which reduces the drying effect of the tea leaves in the air-venting cylinder 4.

[0038] The auxiliary air-filling pipe 41 is sealed at one end away from the end box 5, which increases the air pressure ejected from the auxiliary air outlet groove 42. The other end of the auxiliary air-filling pipe 41 is located on the left side of the breathable tea sliding plate 13 and is conical. When the air flow pushes the tea leaves on one side of the breathable tea sliding plate 13 to contact the auxiliary air-filling pipe 41, the conical part of the auxiliary air-filling pipe 41 can assist the tea leaves to disperse. The breathable tea sliding plate 13 can be rotatably sleeved on the outer surface of the auxiliary air-filling pipe 41, and the ventilation pipe 3 connected to the end box 5 can be rotatably sleeved on the outer surface of the auxiliary air-filling pipe 41.

[0039] A plurality of ring frame structures 47 are coaxially arranged on the outer ring side of the auxiliary gas filling pipe 41 .

[0040] The ring frame structure 47 includes multiple breathable bent plates 471 and ring rods 472. The breathable bent plates 471 are fixedly sleeved on the outer surface of the ring rods 472. The breathable bent plates 471 are fixed to the inner wall of the breathable tube 4 through the vertical shaft rod 473. The breathable tube 4 drives all the breathable bent plates 471 to rotate synchronously through the ring rods 472 and the vertical shaft rod 473. The breathable bent plates 471 allow air to pass through, thereby increasing the fluidity of the air flow.

[0041] The left and right ends of the ventilation bending plate 471 are inclined, and the distance between the left end of the ventilation bending plate 471 and the axis of the ventilation cylinder 4 is greater than the distance between the right end of the ventilation bending plate 471 and the axis of the ventilation cylinder 4. The ring rod 472 is coaxially arranged with the ventilation cylinder 4, and the ventilation bending plate 471 rotates with the ventilation cylinder 4. The ventilation bending plate 471 can stir the tea leaves in the ventilation cylinder 4 during rotation. When the tea leaves move to the left with the air flow, they gradually move away from the axis of the ventilation cylinder 4 while sliding on the side of the ventilation bending plate 471 away from the ventilation cylinder 4. When the tea leaves move to the right with the air flow, they gradually approach the axis of the ventilation cylinder 4 while sliding on the side of the ventilation bending plate 471 close to the ventilation cylinder 4. When the two ventilation pipes 3 alternately spray hot air, they can drive the tea leaves to move back and forth in the directions away from and close to the axis of the ventilation cylinder 4, thereby increasing the drying path of the tea leaves in the ventilation cylinder 4.

[0042] The plurality of ventilation bent plates 471 connected to the ring rod 472 are evenly distributed along the axis of the ventilation cylinder 4. The evenly distributed ventilation bent plates 471 can evenly drive the tea leaves to move when rotating.

[0043] The auxiliary gas pipe 41 is located outside the end box 5 and is equipped with a rotatable gas supply pipe B43 at one end. The gas supply pipe B43 is fixedly connected to the end box 5. The gas supply pipe A8 and the gas supply pipe B43 are connected to the external hot air supply equipment.

[0044] A rotatable transmission gear 44 is installed on the lower surface of the end box 5. The transmission gear 44 and the auxiliary gas filling pipe 41 are transmitted through a conveyor belt 45. A transmission wheel that cooperates with the conveyor belt 45 is installed at the connection between the transmission gear 44, the auxiliary gas filling pipe 41 and the conveyor belt 45. A driving gear 46 is engaged with the lower side of the transmission gear 44. The driving gear 46 is coaxially fixed and sleeved on the output end of the motor B16. The driving gear 46 is connected to the output end of the motor B16 through a pin key. The driving gear 46 is engaged with the transmission gear 44 for power transmission.

[0045] The tea leaves are gradually transported downwards to the side of the air-permeable tea-sliding plate 13 during rotation, so as to prevent more tea leaves from moving to the left at one time when the hot air flows, causing the tea leaves to accumulate in the air-permeable cylinder 4, thereby causing the tea leaves to be unable to be fully contacted with the hot air for drying.

[0046] The end of the drying outer box 1 away from the end box 5 is connected to a discharge pipe 14, which is connected to the inside of the ventilation tube 4. The tea leaves in the ventilation tube 4 are discharged from the discharge pipe 14 driven by the air flow.

[0047] The working principle is as follows: the tea leaves to be dried are placed into the left side of the air-permeable and slippery tea plate 13 inside the end box 5 through the opening of the end box 5, and hot air is filled into the bent tube 6 through the air supply pipe A8. When the bent tube 6 rotates, air flow can be alternately filled into the large cavity 10 and the small cavity 11. The two ventilation pipes 3 alternately fill hot air from both sides of the drying outer box 1, and the ventilation pipe 3 located on one side of the end box 5 takes a longer time to pass hot air. The hot air filled into the drying outer box 1 drives the tea leaves on the surface of the air-permeable and slippery tea plate 13 to move toward the side of the discharge pipe 14. The hot air filled from the other end of the drying outer box 1 takes a shorter time. The filled hot air drives the tea leaves in the drying outer box 1 to flow to the side away from the discharge pipe 14, so that the tea leaves move back and forth left and right in the drying outer box 1 while moving toward the side of the discharge pipe 14 as a whole, thereby increasing the drying time of the tea leaves in the drying outer box 1, so that the tea leaves can be fully dried when the length of the drying outer box 1 is shorter.

[0048] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drum-type tea screening and drying machine, comprising a drying outer box (1), characterized in that: The drying outer box (1) is coaxially provided with a ventilating cylinder (4), one end of the drying outer box (1) is coaxially fixedly provided with an end box (5), and the end of the end box (5) and the drying outer box (1) are both penetrated by a ventilating pipe (3), the upper surface of the drying outer box (1) is provided with an annular cylinder (2), and the two ventilating pipes (3) are respectively penetrated by the outer annular surface of the annular cylinder (2) at one end close to each other, and a rotatable sealing cylinder (7) is coaxially provided inside the annular cylinder (2), and a bending pipe (6) is installed inside the annular cylinder (2). The bending pipe (6) is provided with a ventilating pipe (7) and a ventilating pipe (7) is provided at the inner side of the annular cylinder (2). ) The lower end is installed through the inner annular surface of the sealing tube (7), and the upper end of the bending tube (6) is sleeved with a relatively rotatable air supply pipe A (8), which is fixed to the annular tube (2). Two partitions (9) are installed inside the annular tube (2) and outside the sealing tube (7). A large cavity (10) and a small cavity (11) are formed between the two partitions (9) and the annular tube (2) and the sealing tube (7). The ventilation pipe (3) connected to the end box (5) is connected to the large cavity (10), and the other ventilation pipe (3) is connected to the small cavity (11); A rotatable twist cylinder (12) is coaxially inserted between the end box (5) and the drying outer box (1), the air-permeable cylinder (4) is coaxially fixedly connected to the twist cylinder (12), a breathable tea sliding plate (13) is fixedly installed inside the end box (5), the upper surface of the end box (5) is open at the breathable tea sliding plate (13), and the end of the drying outer box (1) away from the end box (5) is connected to a discharge pipe (14).

2. A drum-type tea screening and drying machine according to claim 1, characterized in that: A motor A (15) is installed on the upper surface of the drying outer box (1), the lower end of the bending tube (6) is horizontal, the upper end of the bending tube (6) is vertical, and the output end of the motor A (15) is fixed to the horizontal end of the bending tube (6).

3. The drum-type tea screening and drying machine according to claim 1, characterized in that: The ventilation pipe (3) connected to the drying outer box (1) is connected to a jet disc (31) installed thereon. The jet disc (31) is located at the discharge pipe (14) and is in a notch shape. The side of the jet disc (31) close to the end box (5) is in a breathable shape.

4. The drum-type tea screening and drying machine according to claim 1, characterized in that: A motor B (16) is installed on the bottom surface of the drying outer box (1), and the output end of the motor B (16) and the outer ring surface of the twisting cylinder (12) are driven by a chain (17).

5. The drum-type tea screening and drying machine according to claim 4, characterized in that: An auxiliary gas adding pipe (41) is coaxially arranged on the inner side of the ventilation cylinder (4), and an auxiliary gas outlet groove (42) communicating with the inside and outside is opened on the outer annular surface of the auxiliary gas adding pipe (41). The end of the auxiliary gas adding pipe (41) away from the end box (5) is blocked, and the ventilation sliding plate (13) can be rotatably sleeved on the outer surface of the auxiliary gas adding pipe (41). The ventilation pipe (3) connected to the end box (5) can be rotatably sleeved on the outer surface of the auxiliary gas adding pipe (41). The auxiliary gas adding pipe (41) ) A rotatable air supply pipe B (43) is installed at one end outside the end box (5), and the air supply pipe B (43) is fixedly connected to the end box (5). A rotatable transmission gear (44) is installed on the lower surface of the end box (5). The transmission gear (44) and the auxiliary air supply pipe (41) are driven by a conveyor belt (45). A driving gear (46) is meshed with the lower side of the transmission gear (44), and the driving gear (46) is coaxially fixedly sleeved on the output end of the motor B (16).

6. The drum-type tea screening and drying machine according to claim 1, characterized in that: The air-permeable tea-sliding plate (13) is tilted, and the air-permeable tea-sliding plate (13) is in contact with a rotatable tea-moving column (131) on one side close to the drying outer box (1). A plurality of evenly distributed tea-moving grooves (132) are provided on the circumferential side of the tea-moving column (131), and both ends of the tea-moving column (131) can be rotated to penetrate the inner wall of the end box (5).

7. The drum-type tea screening and drying machine according to claim 5, characterized in that: The auxiliary gas outlet grooves (42) are divided into multiple groups and evenly distributed on the surface of the auxiliary gas filling pipe (41). The auxiliary gas outlet grooves (42) are arranged obliquely, and the extension lines of the auxiliary gas outlet grooves (42) are misaligned with the axis of the auxiliary gas filling pipe (41).

8. The drum-type tea screening and drying machine according to claim 5, characterized in that: A plurality of ring frame structures (47) are coaxially arranged on the outer ring side of the auxiliary gas filling pipe (41); The ring frame structure (47) comprises a plurality of breathable bent plates (471) and a ring rod (472). The breathable bent plates (471) are fixedly sleeved on the outer surface of the ring rod (472). The breathable bent plates (471) are fixed to the inner wall of the breathable cylinder (4) via a vertical shaft rod (473).

9. The drum-type tea screening and drying machine according to claim 8, characterized in that: The left and right ends of the ventilating bent plate (471) are both inclined, the distance between the left end of the ventilating bent plate (471) and the axis of the ventilating cylinder (4) is greater than the distance between the right end of the ventilating bent plate (471) and the axis of the ventilating cylinder (4), the ring rod (472) and the ventilating cylinder (4) are coaxially arranged, and the plurality of ventilating bent plates (471) connected to the ring rod (472) are evenly distributed about the axis of the ventilating cylinder (4).

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