Drum-type tea screening and drying machine

Abstract

The invention relates to the technical field of tea leaf drying, in particular to a drum-type tea leaf screening and drying machine which comprises a drying outer box, a ventilation drum is coaxially arranged on the inner side of the drying outer box, an end box is coaxially and fixedly installed at one end of the drying outer box, and ventilation pipes are installed at the ends, away from each other, of the end box and the drying outer box in a penetrating mode. An annular cylinder is installed on the upper surface of the outer drying box, a rotatable sealing cylinder is coaxially installed in the annular cylinder, two partition plates are installed in the annular cylinder and located on the outer side of the sealing cylinder, and a large cavity and a small cavity are formed between the two partition plates and the annular cylinder and between the two partition plates and the sealing cylinder. The lower end of a bent pipe can alternately communicate with a large cavity and a small cavity, the time for introducing hot air into a ventilation pipe located on one side of an end box is long, the time for introducing hot air from the other end of the drying outer box is short, and tea leaves integrally move towards one side of a discharging pipe while moving left and right in the drying outer box in a reciprocating mode; and it is guaranteed that the drying outer box does not need to be too long, and the tea leaves can be dried.

Description

Technical Field

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

[0002] Tea processing, also known as tea making, is a process of turning fresh tea leaves through various processing steps into various semi - finished or finished tea products. Among them, drying is a very important link, which separates the moisture in the tea by heating, facilitating the subsequent processing of the tea.

[0003] Chinese Patent CN107624892A, an efficient drum - type tea dryer, includes a base. A sleeve is arranged in the middle of the base. The left and right ends of the sleeve are fixed to the base through brackets. A drum is sleeved inside the sleeve. A sandwich is formed between the drum and the sleeve. The sandwich is filled with granular desiccants. The inner wall of the drum is evenly provided with air - permeable holes communicating with the sandwich. This invention provides an efficient drum - type tea dryer with a novel structure. The drying mechanism and the dynamic water absorption system are ingeniously set, with high drying efficiency. In addition, the discharging mechanism is ingeniously set, which is convenient for discharging and screening out impurities at the same time.

[0004] The above - mentioned related technologies have the following defects: In the prior art, when drying tea, the tea is driven by hot air to move for drying treatment. The tea follows the unidirectional flow of the hot air, and sufficient box length is required for complete drying, occupying a large space. For this reason, a drum - type tea screening and drying machine is proposed. Summary of the Invention

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

[0006] A drum - type tea screening and drying machine provided by the present invention adopts the following technical scheme: It includes a drying outer box. An air - permeable cylinder is coaxially arranged inside the drying outer box. One end of the drying outer box is coaxially and fixedly installed with an end box. Through - air pipes are respectively installed through the mutually - far - away ends of the end box and the drying outer box. A ring cylinder is installed on the upper surface of the drying outer box. The mutually - close ends of the two through - air pipes respectively penetrate and install on the outer ring surface of the ring cylinder. A rotatable sealing cylinder is coaxially installed inside the ring cylinder. A bent pipe is installed inside the ring cylinder. The lower end of the bent pipe penetrates and installs on the inner ring surface of the sealing cylinder. The upper end of the bent pipe is sleeved with a rotatable air supply pipe A. The air supply pipe A is fixed to the ring cylinder. Two partition plates are installed inside the ring cylinder and outside the sealing cylinder. A large cavity and a small cavity are formed between the two partition plates and the ring cylinder and the sealing cylinder. The through - air pipe connected to the end box communicates with the large cavity, and the other through - air pipe communicates with the small cavity.

[0007] A rotatable torsion cylinder is coaxially inserted between the end box and the drying outer box. The ventilation cylinder is coaxially and fixedly connected to the torsion cylinder. An air-permeable sliding tea plate is fixedly installed inside the end box. The upper surface of the end box is open at the position of the air-permeable sliding tea plate. A discharge pipe is connected and installed at one end of the drying outer box away from the end box.

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

[0009] Optionally, an air jet disc is connected and installed to the ventilation pipe connected to the drying outer box. The air jet disc is in a notch shape at the position of the discharge pipe, and the side of the air 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. The output end of the motor B is driven by a chain to the outer ring surface of the torsion cylinder.

[0011] Optionally, an auxiliary gas adding pipe is coaxially arranged inside the ventilation cylinder. Auxiliary air outlet grooves communicating inside and outside are formed on the outer ring surface of the auxiliary gas adding pipe. One end of the auxiliary gas adding pipe away from the end box is blocked. The air-permeable sliding tea plate is rotatably sleeved on the outer surface of the auxiliary gas adding pipe. The ventilation pipe connected to the end box is rotatably sleeved on the outer surface of the auxiliary gas adding pipe. A rotatable air supply pipe B is installed at one end of the auxiliary gas adding pipe 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 is driven by a conveyor belt to the auxiliary gas adding pipe. A driving gear is engaged below the transmission gear. The driving gear is coaxially and fixedly sleeved on the output end of the motor B.

[0012] Optionally, the air-permeable sliding tea plate is inclined. A rotatable tea stirring column is in contact with the side of the air-permeable sliding tea plate close to the drying outer box. A plurality of uniformly distributed tea stirring grooves are formed on the circumferential side surface of the tea stirring column. Both ends of the tea stirring column can rotatably penetrate through the inner wall of the end box.

[0013] Optionally, the auxiliary air outlet grooves are evenly distributed in multiple groups on the surface of the auxiliary gas adding pipe. The auxiliary air outlet grooves are inclined. The extension line of the auxiliary air outlet groove is offset from the axis of the auxiliary gas adding pipe.

[0014] Optionally, a plurality of ring frame structures are coaxially arranged on the outer ring side of the auxiliary gas adding pipe; The ring frame structure includes a plurality of air-permeable bent plates and ring rods. The air-permeable bent plates are fixedly sleeved on the outer surface of the ring rods. The air-permeable bent plates are fixed to the inner wall of the ventilation cylinder through vertical shaft rods.

[0015] Optionally, both the left and right ends of the air-permeable bent plate are inclined. The distance between the left end of the air-permeable bent plate and the axis of the ventilation cylinder is greater than the distance between the right end of the air-permeable bent plate and the axis of the ventilation cylinder. The ring rod is coaxially arranged with the ventilation cylinder. A plurality of air-permeable bent plates connected to the ring rod are evenly distributed around the axis of the ventilation cylinder.

[0016] In summary, the present invention includes the following beneficial technical effects: By providing components such as a partition plate, an annular cylinder, a large cavity, and a small cavity, during the rotation of the bent pipe relative to the air supply pipe A, the lower end of the bent pipe alternately communicates with the large cavity and the small cavity, enabling the two ventilation pipes to alternately fill hot air into the drying outer box from both ends. The ventilation pipe located on one side of the end box has a longer hot air injection time, and the hot air filled into the drying outer box drives the tea leaves on the surface of the breathable sliding tea plate to move towards the discharge pipe side. The hot air filled from the other end of the drying outer box has a shorter time, and the filled hot air drives the tea leaves in the drying outer box to flow away from the discharge pipe side. This causes the tea leaves to move left and right reciprocally in the drying outer box while moving towards the discharge pipe side as a whole, 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.

[0017] By providing components such as an auxiliary air supply pipe and an auxiliary air outlet groove, through the transmission of the driving gear, the transmission gear, and the conveyor belt, the auxiliary air supply pipe is driven to rotate. The air supply pipe B fills hot air into the auxiliary air supply pipe, and the hot air in the auxiliary air supply pipe is blown into the inner side of the breathable cylinder from the auxiliary air outlet groove. When the auxiliary air outlet groove rotates and jets air following the rotation of the auxiliary air supply pipe, it drives the tea leaves between the auxiliary air supply pipe and the breathable cylinder to rotate around, further increasing the movement trajectory of the tea leaves inside the breathable cylinder and enhancing the tea leaf drying effect. At the same time, the auxiliary air outlet grooves at different positions replenish new hot air to different positions inside the breathable cylinder, preventing the hot air from cooling down as the contact time with the tea leaves becomes longer, resulting in a slower drying effect on the tea leaves.

[0018] By providing a breathable bent plate, the breathable bent plate rotates following the breathable cylinder. During rotation, the breathable bent plate can stir the tea leaves inside the breathable cylinder. At the same time, when the hot air pushes the tea leaves towards the discharge pipe, the tea leaves gradually move away from the axis direction of the breathable cylinder while sliding on the side of the breathable bent plate away from the breathable cylinder. When the hot air pushes the tea leaves to move away from the air outlet pipe, the tea leaves gradually approach the axis of the breathable cylinder while sliding on the side of the breathable bent plate close to the breathable cylinder. This enables the hot air to drive the tea leaves to reciprocally move in the directions of moving away from and approaching the axis of the breathable cylinder, increasing the drying path of the tea leaves inside the breathable cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of an embodiment of the present invention; Figure 2 is the top view structural schematic diagram of an embodiment of the present invention; Figure 3 is the side view structural schematic diagram of an embodiment of the present invention; Figure 4 is the internal structural schematic diagram of the drying outer box of an embodiment of the present invention; Figure 5 is the front view structural schematic diagram of a part of an embodiment of the present invention; Figure 6It is a schematic diagram of the internal structure of the end box in the embodiment of the present invention; Figure 7 It is a schematic diagram of the inner side structure of the air-permeable cylinder in the embodiment of the present invention; Figure 8 It is in the embodiment of the present invention Figure 7 The enlarged schematic diagram of the structure at A; Figure 9 It is a schematic diagram of the structure where the partition plate is connected to the ring cylinder in the embodiment of the present invention.

[0020] Reference numerals: 1, drying outer box; 2, ring cylinder; 3, ventilation pipe; 31, jet disk; 4, air-permeable cylinder; 41, auxiliary gas supply pipe; 42, auxiliary air outlet groove; 43, air supply pipe B; 44, transmission gear; 45, conveyor belt; 46, driving gear; 47, ring frame structure; 471, air-permeable bending plate; 472, ring rod; 473, vertical shaft rod; 5, end box; 6, bending pipe; 7, sealing cylinder; 8, air supply pipe A; 9, partition plate; 10, large cavity; 11, small cavity; 12, torsion cylinder; 13, air-permeable sliding tea plate; 131, tea-poking column; 132, tea-poking groove; 14, discharge pipe; 15, motor A; 16, motor B; 17, chain. Detailed implementation manners

[0021] The following further elaborates on the present invention in conjunction with the attached Figures 1 - 9 drawings.

[0022] The embodiment of the present invention discloses a drum-type tea screening and drying machine. As Figures 1 - 9 shown, it includes a drying outer box 1. An exhaust hole is installed on the outer side of the drying outer box 1 to facilitate the discharge of water vapor generated after the tea inside the drying outer box 1 is dried. An air-permeable cylinder 4 is coaxially arranged inside the drying outer box 1. Air holes for gas flow are provided on the circumferential surface of the air-permeable cylinder 4. An end box 5 is coaxially and fixedly installed at one end of the drying outer box 1. Ventilation pipes 3 are respectively installed through the mutually remote ends of the end box 5 and the drying outer box 1. 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 in a notch shape at the discharge pipe 14. The side of the jet disk 31 close to the end box 5 is air-permeable. The jet disk 31 effectively prevents the hot air flow from driving the tea into the ventilation pipe 3, and at the same time, the jet disk 31 facilitates the evenly distributed airflow ejected on the end face of the air-permeable cylinder 4.

[0023] A ring cylinder 2 is installed on the upper surface of the drying outer box 1. The mutually close ends of the two ventilation pipes 3 respectively penetrate and install the outer ring surface of the ring cylinder 2. A rotatable sealing cylinder 7 is coaxially installed inside the ring cylinder 2. The sealing cylinder 7 rotates coaxially relative to the ring cylinder 2. Sealing structures such as sealing gaskets are installed between the sealing cylinder 7 and the ring cylinder 2 to prevent leakage during the relative rotation of the sealing cylinder 7 relative to the ring cylinder 2. A bending pipe 6 is installed inside the ring cylinder 2. The lower end of the bending pipe 6 penetrates and installs on the inner ring surface of the sealing cylinder 7.

[0024] On the upper surface of the drying outer box 1, a motor A15 is installed. The lower end of the bent pipe 6 is horizontal, and the upper end of the bent pipe 6 is vertical. The output end of the motor A15 is fixed to the horizontal end of the bent pipe 6. The bent pipe 6 and the axis of the motor A15 are connected by a coupling. The motor A15 can drive the vertical end of the bent pipe 6 to rotate coaxially with the drying outer box 1.

[0025] A rotatable air supply pipe A8 is sleeved and installed at the upper end of the bent pipe 6. The air supply pipe A8 is fixed to the annular cylinder 2. Inside the annular cylinder 2 and outside the sealing cylinder 7, two partition plates 9 are installed. Between the two partition plates 9 and the annular cylinder 2 and the sealing cylinder 7, a large cavity 10 and a small cavity 11 are formed. The ventilation pipe 3 connected to the end box 5 communicates with the large cavity 10, and the other ventilation pipe 3 communicates with 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 bent pipe 6, the time of communicating with the small cavity 11 is less than the time of communicating with the large cavity 10. The two ventilation pipes 3 alternately fill hot air from both sides of the drying outer box 1. The ventilation pipe 3 on the side of the end box 5 has a longer time of introducing hot air. The hot air filled into the drying outer box 1 drives the tea leaves to move to the left side, and the hot air filled from the other end of the drying outer box 1 has a shorter time. The filled hot air drives the tea leaves on the right side of the drying outer box 1 to flow, so that the tea leaves move back and forth left and right in the drying outer box 1 while moving towards the discharge pipe 14 as a whole.

[0026] A rotatable torsion cylinder 12 is coaxially inserted and connected between the end box 5 and the drying outer box 1. The ventilation cylinder 4 is coaxially and fixedly connected to the torsion cylinder 12. A motor B16 is installed on the bottom surface of the drying outer box 1. The output end of the motor B16 is driven by a chain 17 on the outer ring surface of the torsion cylinder 12. The surface of the torsion cylinder 12 is provided with a sprocket that cooperates with the chain 17. Sprockets for driving the chain 17 are installed on the output end of the motor B16 and the outside of the torsion cylinder 12. The sprocket is connected to the output end of the motor B16 by a pin key. The transmission by the chain 17 increases the transmission efficiency compared with the conveyor belt.

[0027] An auxiliary air supply pipe 41 is coaxially arranged inside the ventilation cylinder 4. An auxiliary air outlet groove 42 communicating inside and outside is opened on the outer ring surface of the auxiliary air supply pipe 41. The auxiliary air outlet grooves 42 are evenly distributed in multiple groups on the surface of the auxiliary air supply pipe 41. The auxiliary air outlet grooves 42 are inclined. The extension line of the auxiliary air outlet groove 42 is offset from the axis of the auxiliary air supply pipe 41, so that the air flow direction of the air flow ejected from the auxiliary air outlet groove 42 is inclined to the axis of the ventilation cylinder 4. When the auxiliary air supply pipe 41 drives the auxiliary air outlet grooves 42 to rotate and eject air flow, the rotating ejected air flow drives the tea leaves to rotate around the auxiliary air supply pipe 41, increasing the moving path of the tea leaves in the ventilation cylinder 4, thereby enhancing the tea leaf drying effect. At the same time, the auxiliary air outlet grooves 42 at different positions supplement new hot air to different positions inside the ventilation cylinder 4, preventing the drying effect of the tea leaves inside the ventilation cylinder 4 from decreasing due to the reduction of the temperature as the moving trajectory in the ventilation cylinder 4 increases.

[0028] One end of the auxiliary gas injection pipe 41 away from the end box 5 is sealed to increase the air pressure ejected from the auxiliary air outlet groove 42. The other end of the auxiliary gas injection pipe 41 at the part on the left side of the breathable sliding tea plate 13 is conical. When the airflow pushes the tea leaves on one side of the breathable sliding tea plate 13 to contact the auxiliary gas injection pipe 41, the conical part of the auxiliary gas injection pipe 41 can assist the tea leaves to spread out. The breathable sliding tea plate 13 is rotatably sleeved on the outer surface of the auxiliary gas injection pipe 41, and the ventilation pipe 3 connected to the end box 5 is rotatably sleeved on the outer surface of the auxiliary gas injection pipe 41.

[0029] A plurality of ring frame structures 47 are coaxially arranged on the outer ring side of the auxiliary gas injection pipe 41.

[0030] The ring frame structure 47 includes a plurality of 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 cylinder 4 through vertical shaft rods 473. The breathable cylinder 4 drives all the breathable bent plates 471 to rotate synchronously through the ring rods 472 and vertical shaft rods 473. The breathable bent plates 471 can allow airflows to pass through, increasing the fluidity of the airflows.

[0031] Both the left and right ends of the breathable bent plate 471 are inclined. The distance between the left end of the breathable bent plate 471 and the axis of the breathable cylinder 4 is greater than the distance between the right end of the breathable bent plate 471 and the axis of the breathable cylinder 4. The ring rod 472 is coaxially arranged with the breathable cylinder 4. The breathable bent plate 471 rotates following the breathable cylinder 4. When the breathable bent plate 471 rotates, it can stir the tea leaves in the breathable cylinder 4. When the tea leaves move leftward along with the airflow, they gradually move away from the axis of the breathable cylinder 4 while sliding on the side of the breathable bent plate 471 away from the breathable cylinder 4. When the tea leaves move rightward along with the airflow, they gradually approach the axis of the breathable cylinder 4 while sliding on the side of the breathable bent plate 471 close to the breathable cylinder 4. When the two ventilation pipes 3 alternately eject hot air, it can drive the tea leaves to reciprocally move in the directions of moving away from and approaching the axis of the breathable cylinder 4, increasing the drying path of the tea leaves in the breathable cylinder 4.

[0032] A plurality of breathable bent plates 471 connected to the ring rod 472 are evenly distributed around the axis of the breathable cylinder 4. The evenly distributed breathable bent plates 471 can drive the tea leaves to move evenly when rotating.

[0033] One end of the auxiliary gas injection pipe 41 outside the end box 5 is installed with a rotatable air supply pipe B43. The air supply pipe B43 is fixedly connected to the end box 5. The air supply pipe A8 and the air supply pipe B43 are connected to an external hot air supply device.

[0034] A rotatable transmission gear 44 is installed on the lower surface of the end box 5. The transmission gear 44 is driven by a conveyor belt 45 in cooperation with the auxiliary gas filling pipe 41. A transmission wheel cooperating with the conveyor belt 45 is installed at the connection of 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 and fixedly 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 key. The driving gear 46 meshes with the transmission gear 44 for power transmission.

[0035] A breathable sliding tea board 13 is fixedly installed inside the end box 5. The upper surface of the end box 5 is open at the position of the breathable sliding tea board 13. The breathable sliding tea board 13 is inclined, so that the tea leaves have the effect of slowly sliding downward on the breathable sliding tea board 13. The hot air can preheat the falling tea leaves through the breathable sliding tea board 13. A rotatable tea leaf stirring column 131 is in contact with one side of the breathable sliding tea board 13 close to the drying outer box 1. A plurality of uniformly distributed tea leaf stirring grooves 132 are formed on the circumferential side surface of the tea leaf stirring column 131. Both ends of the tea leaf stirring column 131 can rotatably penetrate through the inner wall of the end box 5. The outer end of the tea leaf stirring column 131 is connected to a power motor through a coupling to provide power for the rotation of the tea leaf stirring column 131. The tea leaves fall into the tea leaf stirring grooves 132, and the tea leaf stirring column 131 gradually conveys the tea leaves downward to one side of the breathable sliding tea board 13 during rotation, preventing a large amount of tea leaves from being driven to move leftward at one time when the hot air flows, resulting in the accumulation of tea leaves in the breathable cylinder 4, thus causing the tea leaves to not fully contact with the hot air for drying.

[0036] A discharge pipe 14 is connected and installed at one end of the drying outer box 1 away from the end box 5. The discharge pipe 14 is communicated with the inside of the breathable cylinder 4. The tea leaves in the breathable cylinder 4 are discharged from the discharge pipe 14 under the drive of the air flow.

[0037] The working principle is as follows: The tea leaves to be dried are put into the left side of the breathable sliding tea board 13 inside the end box 5 through the opening of the end box 5. Hot air is filled into the bent pipe 6 through the air supply pipe A8. During the rotation of the bent pipe 6, 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. The ventilation pipe 3 on one side of the end box 5 fills hot air for a longer time. The hot air filled into the drying outer box 1 drives the tea leaves on the surface of the breathable sliding tea board 13 to move towards the discharge pipe 14. The hot air filled from the other end of the drying outer box 1 has a shorter filling time, and the filled hot air drives the tea leaves in the drying outer box 1 to flow towards 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 towards the discharge pipe 14 as a whole, increasing the drying time of the tea leaves in the drying outer box 1, and enabling the tea leaves to be fully dried when the length of the drying outer box 1 is shorter.

[0038] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A drum-type tea screening and drying machine, comprising a drying outer box (1), characterized in that: A ventilation cylinder (4) is coaxially arranged on the inner side of the drying outer box (1); an end box (5) is coaxially fixedly installed on one end of the drying outer box (1); a ventilation pipe (3) is installed through the end of the end box (5) and the drying outer box (1) that are far away from each other; an annular cylinder (2) is installed on the upper surface of the drying outer box (1); the two ventilation pipes (3) are installed through the outer annular surface of the annular cylinder (2) at their ends close to each other; a rotatable sealing cylinder (7) is coaxially installed inside the annular cylinder (2); a bending pipe (6) is installed on the inner side of the annular cylinder (2); the bending pipe (6) ) is installed on the inner annular surface of the sealing tube (7) at its lower end, and a relatively rotatable air supply pipe A (8) is sleeved on the upper end of the bending tube (6). The air supply pipe A (8) is fixed to the annular tube (2). Two baffles (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 baffles (9) and the annular tube (2) and the sealing tube (7). A ventilation pipe (3) connected to the end box (5) is connected to the large cavity (10), and another 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 a discharge pipe (14) is installed at one end of the drying outer box (1) away from the end box (5).

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. A 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), which is located at the discharge pipe (14) in a notch shape, and the side of the jet disc (31) close to the end box (5) is air-permeable.

4. A 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 torsion barrel (12) are driven by a chain (17).

5. A drum-type tea screening and drying machine according to claim 4, characterized in that: An auxiliary gas-filling pipe (41) is coaxially arranged inside the air-permeable cylinder (4), and an auxiliary gas-filling pipe (41) is provided with an auxiliary gas outlet groove (42) communicating with the inside and outside on the outer annular surface. The end of the auxiliary gas-filling pipe (41) away from the end box (5) is blocked, and the air-permeable sliding plate (13) is rotatably sleeved on the outer surface of the auxiliary gas-filling pipe (41). The air-permeable pipe (3) connected to the end box (5) is rotatably sleeved on the outer surface of the auxiliary gas-filling 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 on 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. A 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-sliding column (131) on one side close to the drying outer box (1). A plurality of evenly distributed tea-sliding grooves (132) are provided on the circumferential side of the tea-sliding column (131), and both ends of the tea-sliding column (131) can be rotated to penetrate the inner wall of the end box (5).

7. A 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. A 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 ventilating bent plates (471) and a ring rod (472); the ventilating bent plates (471) are fixedly sleeved on the outer surface of the ring rod (472); and the ventilating bent plates (471) and the inner wall of the ventilating cylinder (4) are fixedly secured via a vertical shaft rod (473).

9. A 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) is coaxially arranged with the ventilating cylinder (4), and the plurality of ventilating bent plates (471) connected to the ring rod (472) are evenly distributed with respect to the axis of the ventilating cylinder (4).

Images