Hot air fixation process for Meitan green buds

Abstract

Belonging to the technical field of tea leaf fixation, the invention discloses a hot air fixation process for Meitan green buds, which comprises the following steps: 1) injecting hot air into a fixation device for preheating; (2) feeding the tea leaves into a fixation device, adjustably mixing high-pressure steam into hot air, and completing fixation by using a mixed medium formed by mixing the hot air and the high-pressure steam, so that the tea leaves can be in full contact with the mixed medium, and the fixation uniformity is improved; 3) cooling the tea leaves after fixation. According to the fixation process provided by the invention, through the fixation device, the problems that in the fixation process of an existing fixation device, insufficient contact between the tea leaves and a thermal medium is easily caused, non-uniform fixation is caused, and the quality of the tea leaves is influenced can be effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of tea leaf withering, in particular to a hot-air withering process for Meitan Cuiya. Background Art

[0002] Tea leaf killing is a key step in tea making. Its purpose is to destroy the activity of oxidases through high temperature, inhibit the enzymatic oxidation of tea polyphenols, soften the tea leaves for easier shaping, and promote the formation of good aroma. The traditional method of killing tea leaves mainly uses steam, hot air or air contact heat transfer. However, steam killing is easy to increase water, and the subsequent dehydration process is difficult. Hot air or air contact heat transfer killing is easy to cause summer and autumn tea to burn and burst, resulting in waste of resources, and uneven heating, resulting in poor killing effect.

[0003] The traditional hot air withering mechanism is simple, and the tea leaves are withered through a hot air duct heating mode. The existing withering device is prone to insufficient contact between the tea leaves and the heat medium during the withering process, resulting in uneven withering. Some tea leaves are overheated, shrink and deform, and lose their fresh taste; while the other part is not heated enough, which is prone to incomplete withering and poor taste, affecting the quality of the tea.

[0004] In order to solve the above problems and improve the quality and efficiency of tea withering, it is necessary to develop a hot air withering process used in the production of Meitan Cui Ya to improve the contact efficiency between tea and heat medium, ensure uniform withering of tea while improving the utilization rate of heat medium, so as to obtain better quality tea. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned background technical difficulties. The present invention provides a hot air withering process for Meitan Cui Ya to improve the efficiency of contact between tea leaves and heat medium, ensure uniform withering of tea leaves while improving the utilization rate of heat medium, so as to obtain better quality tea leaves.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A hot air fixing process for Meitan Cuiya, comprising the following steps: 1) Inject hot air into the fixing device for preheating; 2) The tea leaves are sent into the withering device, and high-pressure steam is adjusted to be mixed into the hot air, and the withering is completed by using the mixed medium formed by the hot air and the high-pressure steam, so that the tea leaves can be fully in contact with the mixed medium, thereby improving the uniformity of withering; 3) Cool the tea leaves after withering.

[0007] Furthermore, the withering device includes a cylinder body and a heating component for providing the cylinder body with a medium used for withering, the cylinder body is composed of an outer cylinder body and a rotating cylinder arranged in the outer cylinder body, the outer cylinder body is provided with a preheating zone, a withering zone and a cooling zone corresponding to the rotating cylinder; the outer cylinder body is symmetrically provided with drainage pipes for connecting the preheating zone and the withering zone, the outer cylinder body is provided with a baffle ring on the inner circumference corresponding to the withering zone, the rotating cylinder is provided with a rotating ring used in conjunction with the baffle ring on the outer circumference, the upper end of the outer cylinder body is provided with an exhaust port corresponding to the cooling zone to ensure that the tea leaves can be quickly cooled down after withering, and the lower end of the outer cylinder body is provided with an air supply port corresponding to the cooling zone to cool the tea leaves after withering.

[0008] Furthermore, the drainage pipe is provided with a regulating valve for adjusting the size of the airflow, one end of the drainage pipe is connected to the pipe inlet, and the other end of the drainage pipe is connected to the pipe outlet. The pipe inlet is arranged in the middle position of the preheating zone and is arranged in contact with the inner wall of the outer cylinder toward the output end of the heating component.

[0009] Furthermore, the outlet is in a wide-mouth shape in close contact with the inner wall of the outer cylinder, the output end of the outlet on one side of the outer cylinder is arranged toward the rotating cylinder at an angle of 30-45° to the horizontal plane, and the output end of the outlet on the other side of the outer cylinder is arranged toward the rotating cylinder at an angle of 135-160° to the horizontal plane.

[0010] Furthermore, the height of the baffle ring is higher than that of the rotating ring. When the rotating ring is used in conjunction with the baffle ring, the rotating ring is 1-3 mm away from the baffle ring, the outer ring of the rotating ring is arranged relative to the middle of the baffle ring, and the outer ring of the baffle ring is 3-5 mm away from the rotating cylinder.

[0011] Furthermore, the outer cylinder is provided with a control switch for controlling the opening and closing of the baffle ring, and a cleaning window is provided at the lower end of the outer cylinder corresponding to the killing area.

[0012] Furthermore, the temperature of the fixing in step 2) is 180-220° C., and the fixing time is 3-10 min.

[0013] Furthermore, the rotation speed of the fixing device in step 2) shall not be lower than 20 r / min.

[0014] The hot air fixing process of Meitan Cuiya provided by the present invention has the following beneficial effects: The withering process of the present invention utilizes the drainage tube provided in the withering device in conjunction with the baffle ring provided on the inner circumference of the outer cylinder corresponding to the withering area and the rotating ring provided on the outer circumference of the rotating cylinder for use in conjunction with the baffle ring, which can improve the withering efficiency of the mixed medium formed by the mixture of hot air and high-pressure steam on the tea leaves in the withering area, increase the contact area between the mixed medium and the tea leaves, and make the tea leaves in the withering area heated more evenly, so that the tea leaves after withering are bright green, have good resilience, and have a mellow and natural aroma with obvious chestnut fragrance, without stuffy or peculiar smell; the tea soup produced subsequently after brewing is bright yellow, fresh, strong and refreshing, and has a long aftertaste; not only can the withering quality be improved, but also the utilization rate of the heat medium and high-pressure steam can be improved, and its energy consumption can be reduced, thereby effectively solving the problem that the existing withering device is prone to insufficient contact between the tea leaves and the heat medium during the withering process, resulting in uneven withering and affecting the quality of the tea leaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the withering device used in the hot air withering process of Meitan Cui Ya in the present invention.

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the cylinder of the hot air withering device used in the hot air withering process of Meitan Cui Ya in the present invention.

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the outer cylinder of the withering device used in the hot air withering process of Meitan Cui Ya in the present invention.

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the outlet pipe of the hot air withering device used in the hot air withering process of Meitan Cui Ya in the present invention.

[0019] In the figure, 1. outer cylinder; 2. heating component; 3. preheating zone; 4. killing zone; 5. cooling zone; 6. drainage pipe; 7. baffle ring; 8. rotating ring; 9. exhaust port; 10. air supply port; 11. pipe inlet; 12. pipe outlet; 13. rotating cylinder. DETAILED DESCRIPTION

[0020] The technical scheme of the present invention is clearly and completely described below in conjunction with the specific embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1 The invention provides a hot air withering process for Meitan Cuiya, which uses a mixed medium formed by mixing hot air and high-pressure steam to wither tea leaves, and comprises the following steps: 1) Hot air is injected into the withering device with a diameter of 100 cm by a digital temperature-controlled hot air blower to preheat the withering device. On the one hand, the tea leaves can be evenly heated to the temperature required for withering, thereby improving the withering efficiency. On the other hand, the high temperature can quickly destroy the activity of polyphenol oxidase when the tea leaves enter the withering device, thereby retaining more aroma substances and improving the quality of subsequent tea withering.

[0022] 2) The tea leaves are sent into the withering device, and high-pressure steam is adjusted to be mixed into the hot air. The mixed medium formed by the hot air and high-pressure steam is kept at a withering temperature of 180-220°C. The speed of the withering device shall not be lower than 20r / min, and the withering time shall be 3-10min to complete the withering, so that the tea leaves can fully contact with the mixed medium, thereby improving the uniformity of withering.

[0023] 3) Use exhaust air together with cold air to quickly cool the tea leaves after withering.

[0024] In this embodiment, the tea leaves are withered according to the above-mentioned withering process, and the test tea varieties are: one bud and one leaf or one bud and two leaves of Qiancha No. 1 are initially unfolded; the mixed medium formed by mixing hot air and high-pressure steam is used at a withering temperature of 195-215°C, the rotation speed of the withering device shall not be lower than 20r / min, and the withering time is 4-6min. After withering, the tea leaves are bright green, have good resilience, and have a mellow and natural aroma with obvious chestnut fragrance, without stuffy or peculiar smell; the tea produced subsequently is brewed with a bright yellow tea soup, which is fresh, strong and refreshing, and has a long aftertaste.

[0025] Embodiment 2 On the basis of the above embodiment, this embodiment is to improve the quality of finishing and production efficiency. Figure 1-4 The tea-fixing device described in the present application includes a cylinder and a heat supply component 2 for providing a medium for fixing the tea leaves to the cylinder. The heat supply component 2 includes a high-pressure steam generator, a digital temperature-controlled hot air blower, and a controller for controlling the operation of the high-pressure steam generator and the digital temperature-controlled hot air blower. The heat supply component 2 delivers high-pressure steam and hot air into the cylinder through a pipeline. The cylinder is composed of an outer cylinder 1 and a rotating cylinder 13 arranged in the outer cylinder 1. The rotating cylinder 13 is equipped with a driving component for driving the rotating cylinder 13 to rotate. The feeding end of the cylinder is arranged higher than the discharging end. The present application transports tea leaves into the rotating cylinder 13 through a conveying belt. The outer cylinder 1 of the present application is provided with a preheating zone 3, a fixing zone 4, and a cooling zone 5 along the tea leaf transmission direction corresponding to the rotating cylinder 13. The present application first preheats the tea-fixing device in the preheating zone 3 and suppresses the high temperature of the tea leaves entering the preheating zone 3. Secondly, the tea leaves entering the fixing zone 4 are fixed, and then the tea leaves entering the cooling zone 5 are cooled.

[0026] The outer cylinder 1 is symmetrically provided with a drainage pipe 6 for connecting the preheating zone 3 and the fixing zone 4, so that the drainage pipe 6 is arranged on the two side walls of the outer cylinder 1. The arrangement of the drainage pipe 6 of the present application can, on the one hand, improve the preheating effect of the hot air on the fixing device and at the same time disperse the mixed medium on the surface of the tea leaves in the preheating zone 3 to avoid tea ripening and affect the subsequent tea fixing quality; on the other hand, it can improve the fixing efficiency and quality of the fixing zone 4; the drainage pipe 6 is provided with a regulating valve for adjusting the size of the airflow, and the present application controls the airflow of the drainage pipe 6 by adjusting the regulating valve according to the tenderness of the fixing tea leaves. , thereby controlling the amount of the mixed medium acting on the outer wall of the rotating cylinder 13 to perform the withering treatment on the tea leaves, so that the tea leaves are evenly heated during the withering process, thereby ensuring uniform withering color; one end of the drainage pipe 6 of the present application is connected to the pipe inlet 11, and the pipe inlet 11 is arranged in the middle position of the preheating zone 3, and is arranged in contact with the inner wall of the outer cylinder 1 toward the output end of the heating component 2. When the regulating valve of the drainage pipe 6 of the present application is fully opened, the mixed medium entering the preheating zone 32 / 5 will flow from the drainage pipe 6 into the withering zone 4, thereby dispersing the mixed medium in the preheating zone 3 acting on the surface of the tea leaves, ensuring the subsequent withering quality of the tea leaves.

[0027] The other end of the drainage pipe 6 of the present application is connected to the outlet 12, and the outlet 12 is in a wide-mouth shape relative to the rotating cylinder 13 in close contact with the inner wall of the outer cylinder 1. The output end of the outlet 12 on one side of the outer cylinder 1 is arranged at an angle of 30-45° with the horizontal plane toward the rotating cylinder 13, and the output end of the outlet 12 on the other side of the outer cylinder 1 is arranged at an angle of 135-160° with the horizontal plane toward the rotating cylinder 13, that is, the outlet 12 is arranged to be inclined upward relative to the rotating cylinder 13, and the hot air is driven by the high-pressure steam to act on the outer wall of the rotating cylinder 13. Through experimental comparison, it is found that when the output end of the outlet pipe 12 on one side of the outer cylinder 1 of the present application is arranged at an angle of 40° to the horizontal plane toward the rotating cylinder 13, and the output end of the outlet pipe 12 on the other side of the outer cylinder 1 is arranged at an angle of 140° to the horizontal plane toward the rotating cylinder 13, the time for killing green tea is 4.5 minutes, and the color of the tea leaves after killing green tea is bright green, with good resilience, mellow and natural aroma, with obvious chestnut aroma, and no stuffy or peculiar smell; the output end of the outlet pipe 12 on one side of the outer cylinder 1 of the present application is arranged at an angle of more than 40° to the horizontal plane toward the rotating cylinder 13 The output end of the outlet pipe 12 on one side of the outer cylinder 1 is arranged at an angle less than 40° to the horizontal plane toward the rotating cylinder 13, and the output end of the outlet pipe 12 on the other side of the outer cylinder 1 is arranged at an angle less than 140° to the horizontal plane toward the rotating cylinder 13, and the withering time is 6 minutes. The color of the tea leaves after withering is green and light yellow, with good resilience, mellow aroma, and chestnut aroma; the output end of the outlet pipe 12 on one side of the outer cylinder 1 of the present application is arranged at an angle less than 40° to the horizontal plane toward the rotating cylinder 13, and the output end of the outlet pipe 12 on the other side of the outer cylinder 1 is arranged at an angle less than 140° to the horizontal plane toward the rotating cylinder 13, and the withering time is 5 minutes, The color of the tea leaves after withering is light yellow with a cyan-green color, the resilience is average, and the aroma has a chestnut flavor; in summary, when the output end of the outlet pipe 12 on one side of the outer cylinder 1 of the present application is arranged at an angle of 40° to the horizontal plane toward the rotating cylinder 13, and the output end of the outlet pipe 12 on the other side of the outer cylinder 1 is arranged at an angle of 140° to the horizontal plane toward the rotating cylinder 13, the withering effect is good, the withering time is 4.5 minutes, and the color of the tea leaves after withering is bright cyan-green, the resilience is good, the aroma is mellow and natural, with a distinct chestnut aroma, and no stuffy or peculiar smell.

[0028] The outer cylinder body 1 of the present application is provided with a baffle ring 7 on the inner circumference corresponding to the fixing zone 4, and the rotating cylinder 13 is provided with a rotating ring 8 used in conjunction with the baffle ring 7 on the outer circumference. The present application uses the baffle ring 7 in combination with the rotating ring 8 to allow the mixed medium entering the fixing zone 4 to enter the fixing zone 4 from the rotating cylinder 13 and the drainage tube 6, thereby preventing the mixed medium from being lost from the cavity formed between the outer cylinder body 1 and the rotating cylinder 13, which can improve the utilization rate of the mixed medium, increase the contact area between the mixed medium and the tea leaves in the fixing zone 4, and thus improve the mixing efficiency. The combined medium has an effect on the withering treatment of the tea leaves in the withering zone 4; the upper end of the outer cylinder 1 corresponds to the cooling zone 5 and is provided with an exhaust port 9 for ensuring that the tea leaves can be quickly cooled down after withering, and the lower end of the outer cylinder 1 corresponds to the cooling zone 5 and is provided with an air supply port 10 for cooling the tea leaves after withering. The exhaust port 9 set in the present application can quickly take away the heat from the surface of the tea leaves, and the cold air provided by the air supply port 10 can pass through the tea leaves under the action of the exhaust port 9, so that the tea leaves can be quickly cooled down and the fragrance of the tea leaves can be locked.

[0029] The outer cylinder body 1 described in the present application is provided with a control switch for controlling the opening and closing of the baffle ring 7, that is, during the assembly process, the baffle ring 7 is driven to tilt to one side of the outer cylinder body 1 through the control switch, which is convenient for the assembly and maintenance of the rotating cylinder 13 and improves its practical performance; a cleaning window is provided at the lower end of the outer cylinder body 1 corresponding to the withering area 4. The setting of the cleaning window facilitates the cleaning of the withering area 4 at any time to prevent the residues dropped during the withering process from being charred under high temperature for a long time, affecting the aroma of the tea. An observation window is also provided on the outer cylinder body 1 corresponding to the withering area 4. The present application can observe the assembly status of the inner cylinder body and the rotating cylinder 13 through the observation window, and can also observe the withering status of the withering area 4 through the observation window.

[0030] Before operation, the present application preheats the withering device through a CNC temperature-controlled hot air blower to fill the withering device with hot air, and then transports the tea leaves into the withering device through a conveyor belt. The tea leaves are withered using a mixed medium formed by a mixture of hot air and high-pressure steam, which can quickly volatilize the moisture in the tea leaves and form a temperature gradient on the surface of the tea leaves. The mixed medium in the preheating zone 3 is drained to the withering zone 4 in combination with the drainage pipe 6 of the present application and acts on the outer wall of the rotating drum 13. During the rotation of the rotating drum 13, the tea leaves in the rotating drum 13 are withered, and then the withered tea leaves are quickly cooled through the exhaust port 9 in combination with the air supply port 10. The withering device provided by the present application can improve the withering efficiency and quality, ensure the uniform color of the tea leaves after withering, and improve the withering efficiency by 8% compared with the existing hot air drum withering device.

[0031] Embodiment 3 On the basis of the above embodiments, in order to improve the efficiency of tea leaves withering in the withering zone 4 by the mixed medium formed by the hot air and the high-pressure steam, the height of the baffle ring 7 described in the present application is higher than the height of the rotating ring 8. When the rotating ring 8 and the baffle ring 7 are used in conjunction with each other, the rotating ring 8 and the baffle ring 7 are 1-3mm apart, the outer ring of the rotating ring 8 is arranged relative to the middle of the baffle ring 7, and the outer ring of the baffle ring 7 is 133-5mm away from the rotating cylinder, so that most of the mixed medium used in the withering zone 4 enters the withering zone 4 from the rotating cylinder 13, which can While the tea leaves in the rotating drum 13 are being withered, the hot air in the preheating zone 3 is drained to the withering zone 4 under the action of high-pressure steam in combination with the drainage pipe 6 to act on the outer wall of the rotating drum 13 to wither the tea leaves, so that the tea leaves in the rotating drum 13 can be heated more evenly during the rotation of the rotating drum 13; experimental comparison shows that the hot air withering device provided in the present application has a 12% higher withering efficiency and a 5% lower energy consumption than the drum hot air withering machine used in the prior art (its structure refers to application number 202020025597.6).

[0032] Control group 1 On the basis of the above embodiments, the difference between this control group and embodiment 2 is that the drainage pipe 6 is not provided; the same batch of tea leaves are withered by a mixed medium formed by mixing hot air and high-pressure steam. After experimental comparison, it is found that the withering efficiency of the hot air withering device provided by the control group is 5% lower than that of the hot air withering device provided by the present application, and its energy consumption is increased by 3%.

[0033] Control group 2 The difference between this control group and Example 2 is that the baffle ring 7 and the rotating ring 8 used in conjunction with the baffle ring 7 are not provided; the same batch of tea leaves are withered by a mixed medium formed by a mixture of hot air and high-pressure steam. After experimental comparison, it is found that the withering efficiency of the hot air withering device provided by the control group is 8% lower than that of the hot air withering device provided by the present application, and its energy consumption is increased by 6%.

[0034] In summary, the hot air fixing process of Meitan Cui Ya provided by the present application utilizes a mixed medium formed by a mixture of hot air and high-pressure steam in the fixing device of the present application at a fixing temperature of 195-215°C, the fixing device rotation speed shall not be lower than 20r / min, the fixing time is 4-6min, and the tea leaves after fixing are bright green in color, have good resilience, and have a mellow and natural aroma with obvious chestnut fragrance, without stuffy or peculiar smell; the tea soup produced subsequently is bright yellow, fresh, strong and refreshing, with a long aftertaste after brewing; that is, before the operation of the present application, first check whether the operation of each component of the fixing device is normal, and then adjust the regulating valve on the drainage pipe 6 according to the production and processing amount of tea leaves, control the air flow from the drainage pipe 6 into the fixing area 4, and then set the numerically controlled temperature-controlled hot air blower and the high-pressure steam generator and the driving device for driving the rotating drum 13 to rotate through the operating controller. The parameters of the dynamic components are as follows: first, the numerically controlled temperature-controlled hot air blower and the steam generator are started to preheat the fixing device. At this time, the steam generator is adjusted to the lowest gear, and then the tea leaves are sent into the rotating cylinder 13 through the conveyor belt. Then, according to the amount of the fixing tea leaves, the steam generator is adjusted to the high-pressure steam to quickly send the hot air into the fixing area 4, so that the tea leaves in the fixing area 4 are fixed by the mixed medium formed by the hot air and the high-pressure steam. The fixing tea leaves are transported to the cooling area 5, and the air exhaust component provided by the air exhaust port 9 is combined with the air supply component provided by the air supply port 10 to cool the tea leaves in the cooling area 5, so as to quickly take away the heat carried by the tea leaves, and improve the cooling efficiency and quality; thereby effectively solving the problem that the fixing process of the existing fixing device is prone to insufficient contact between the tea leaves and the heat medium, resulting in uneven fixing and affecting the quality of the tea leaves. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that all changes falling within the meaning and range of equivalent elements of the claims are included in the present invention.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hot air fixing process for Meitan Cuiya, characterized in that: The following steps are involved: 1) Inject hot air into the fixing device for preheating; 2) The tea leaves are sent into the withering device, and high-pressure steam is adjusted to be mixed into the hot air, and the withering is completed by using the mixed medium formed by the hot air and the high-pressure steam, so that the tea leaves can be fully in contact with the mixed medium, thereby improving the uniformity of withering; 3) Cool the tea leaves after withering.

2. The hot air fixing process for Meitan Cuiya according to claim 1, characterized in that: The tea-withering device comprises a cylinder and a heating component (2) for providing a medium for withering to the cylinder. The cylinder comprises an outer cylinder (1) and a rotating cylinder (13) arranged in the outer cylinder (1). The outer cylinder (1) is provided with a preheating zone (3), a withering zone (4) and a cooling zone (5) corresponding to the rotating cylinder (13). The outer cylinder (1) is symmetrically provided with a drainage pipe (6) for connecting the preheating zone (3) and the withering zone (4). A baffle ring (7) is provided on the inner circumference of the outer cylinder (1) corresponding to the withering zone (4). A rotating ring (8) used in conjunction with the baffle ring (7) is provided on the outer circumference of the rotating cylinder (13). An air exhaust port (9) for ensuring that the tea leaves can be quickly cooled after withering is provided at the upper end of the outer cylinder (1) corresponding to the cooling zone (5). An air supply port (10) for cooling the tea leaves after withering is provided at the lower end of the outer cylinder (1) corresponding to the cooling zone (5).

3. The hot air fixing process for Meitan Cuiya according to claim 2, characterized in that: The drainage pipe (6) is provided with a regulating valve for adjusting the size of the airflow; one end of the drainage pipe (6) is connected to the pipe inlet (11), and the other end of the drainage pipe (6) is connected to the pipe outlet (12); the pipe inlet (11) is arranged in the middle of the preheating zone (3) and is arranged in contact with the inner wall of the outer cylinder (1) and towards the output end of the heating component (2).

4. The hot air fixing process for Meitan Cuiya according to claim 3, characterized in that: The outlet pipe (12) is fitted to the inner wall of the outer cylinder (1) and is in a wide-mouth shape; the output end of the outlet pipe (12) on one side of the outer cylinder (1) is arranged at an angle of 30-45° to the horizontal plane and is disposed toward the rotating cylinder (13); and the output end of the outlet pipe (12) on the other side of the outer cylinder (1) is arranged at an angle of 135-160° to the horizontal plane and is disposed toward the rotating cylinder (13).

5. The hot air fixing process for Meitan Cuiya according to claim 2, characterized in that: The height of the baffle ring (7) is higher than the height of the rotating ring (8); when the rotating ring (8) and the baffle ring (7) are used in combination, the rotating ring (8) is 1-3 mm away from the baffle ring (7); the outer ring of the rotating ring (8) is arranged relative to the middle of the baffle ring (7); and the outer ring of the baffle ring (7) is 3-5 mm away from the rotating cylinder (13).

6. The hot air fixing process for Meitan Cuiya according to claim 2, characterized in that: The outer cylinder (1) is provided with a control switch for controlling the opening and closing of the baffle ring (7), and a cleaning window is provided at the lower end of the outer cylinder (1) corresponding to the killing area (4).

7. The hot air fixing process for Meitan Cuiya according to claim 1, characterized in that: The temperature of the step 2) is 180-220° C. and the duration of the fixing is 3-10 minutes.

8. The hot air fixing process for Meitan Cuiya according to claim 1, characterized in that: The speed of the fixing device in step 2) shall not be less than 20r / min.

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