A continuous fixing machine and operation method thereof

Abstract

The present invention discloses a continuous tea-fixing machine and an operation method thereof, wherein the continuous tea-fixing machine comprises a feeding impurity removal conveyor belt, an electromagnetic tea-fixing drum, a hot air tea-fixing tank, a wet hot steam recovery heating purification device, and an intelligent control device. The present invention first removes the impurities entrained in the tea leaves through the impurity removal conveyor belt, and then uses the electromagnetic radiation heat energy of the electromagnetic tea-fixing drum to penetrate into the inner layer of the tea leaves for a stuffy tea-fixing, quickly killing the polyphenol oxidase activity in the inner layer of the tea leaves, preventing the red change reaction, and then uses the hot air tea-fixing tank for a secondary penetration tea-fixing, efficiently volatilizing the wet hot gas, promoting the volatilization of aromatic substances and improving the aroma, and can overcome the technical limitation that the existing drum-type tea-fixing machine is difficult to quickly emit and eliminate the wet hot gas that affects the tea-fixing quality. The wet hot gas recovery heating purification device recovers, heats, purifies and reuses the wet hot gas in the hot air tea-fixing tank, thereby effectively improving the utilization rate of heat and achieving energy saving and emission reduction.

Description

Technical Field

[0001] The invention relates to the field of tea processing machinery, in particular to a continuous tea-withering machine and an operating method thereof. Background Art

[0002] Most of the current tea-withering machines are drum-type tea-withering machines. Although this type of tea-withering machine has the characteristics of high withering temperature and even and thorough withering, it is difficult to quickly dissipate and remove the hot and humid air from withering because the drum body is a relatively closed cylindrical structure. If it is used for withering green tea, it is easy to appear stuffy and yellow, and it is not suitable for withering "Da Hong Pao Tea". Because the withering of Da Hong Pao tea requires not only even withering, but also timely dissipation and removal of the green moisture generated when shaking the green tea, which is conducive to the formation of good quality. If the green moisture is not removed in time, the finished tea will have the disadvantages of heavy green and astringent taste and low aroma. In addition, most of the existing drum-type tea-withering machines use electric heating to conduct heat through the inner wall of the drum. When the tea leaves contact the inner wall of the drum, the problem of burnt edges will occur, affecting the quality of the tea leaves. Summary of the invention

[0003] The purpose of the present invention is to provide an electromagnetic drum and hot air trough type continuous tea-fixing machine and an operation method thereof, so as to solve the problem that the existing drum type tea-fixing machine cannot discharge hot and humid air in time and is prone to yellowing, thus affecting the quality of tea-fixing.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a continuous tea-fixing machine, including a feeding and impurity removal conveyor belt, an electromagnetic tea-fixing roller, a hot air tea-fixing tank, a wet hot steam recovery heating and purification device, and an intelligent control device.

[0005] In order to achieve clean and efficient ventilation and withering of tea leaves, the discharge port of the feed and impurity removal conveyor belt is connected to the feed port of the electromagnetic withering drum, and then the discharge port of the electromagnetic withering drum is connected to the feed port of the hot air withering trough, so that the magnetic bars and stainless steel screens on the feed and impurity removal conveyor belt can be used to first remove metal rust, insect eggs, fibers, broken tea leaves, dust and other debris, and then the clean buds and leaves are fed into the electromagnetic withering drum, and the electromagnetic radiation heat is used to penetrate into the inner layer of the tea leaves for stuffy withering, which quickly kills the polyphenol oxidase activity in the inner layer of the tea leaves and prevents the red change reaction, and then the hot air withering trough is used for secondary ventilation and withering to remove moist heat and enhance the aroma.

[0006] In order to ensure smooth discharge of the electromagnetic withering drum and the hot air withering trough to achieve continuous production, the electromagnetic withering drum is tilted downward at 3-5 degrees, and the drum body is tilted and rotated clockwise to drive the tea leaves to be discharged; the hot air withering trough is tilted downward at 6-7 degrees, and a vibrator is used to drive the trough body to vibrate and tilt to discharge.

[0007] In order to recover and purify the exhausted hot and humid air for recycling, a high-temperature resistant quartz glass trough cover is installed on the hot air withering trough. A suction fan and a hot and humid air recovery, heating and purification device are used to filter, remove impurities, heat and purify the air to form clean hot air, which is returned to the withering drum and the hot air withering trough for circulating heating and withering. This can not only efficiently remove hot and humid air, which is beneficial to improving the quality of tea withering, but also recycle the purified hot and humid air to achieve energy conservation and emission reduction, improve thermal efficiency and reduce tea making costs.

[0008] In order to prevent the buds and leaves from sticking to the drum wall during electromagnetic sterilization, which may cause them to burn and affect the quality of sterilization, a hot air output pipe that has been heated and purified is arranged at the discharge port of the drum. Hot air is blown towards the drum wall in the reverse direction to blow away the buds and leaves stuck to the drum wall. At the same time, the heat temperature is increased inside the drum to carry out mixed sterilization with electromagnetic and hot air dual heat energy, which can sterilize the buds and leaves evenly and thoroughly.

[0009] In order to ensure that the hot air withering trough has sufficient hot air for withering and to remove hot and humid air, and to prevent the buds and leaves with hot air from sticking to the two walls of the trough and easily coking and affecting the withering quality, a heated and purified hot air output pipe is directly connected to the auger leaf turner, and hot air is blown into the trough through the air outlet of the hot air chamber for heating and withering. At the same time, two hot air output pipes are arranged at the front end feed port of the withering trough, and hot air is blown towards the left and right walls of the trough in the forward direction to blow hot air to them, so that the buds and leaves stuck to the drum wall are blown away and fall off. At the same time, the left and right sides of the trough are heated at the same time, and together with the auger leaf turner in the middle of the trough, a three-dimensional hot air space is formed for three-dimensional withering.

[0010] The present invention also discloses an operating method for tea leaf withering using the above-mentioned continuous tea leaf withering machine, comprising the following steps:

[0011] 1) Impurity removal and feeding conveying: 3-5 minutes in advance, turn on the magnetic bar and vibrator on the feeding impurity removal conveyor, and then feed; set: the speed of the magnetic bar is 25-30r / min, and the vibration frequency of the vibrator is 90-100 times / min; use two rotating magnetic bars to absorb the metal rust impurities entrained in the tea leaves twice, and use the screen of the feeding impurity removal conveyor belt to remove insect bodies, eggs, fibers, broken tea leaves, dust and impurities, so that the clean buds and leaves can be input into the electromagnetic withering drum;

[0012] 2) Electromagnetic killing: 8-10 minutes in advance, turn on the electromagnetic heater of the electromagnetic killing drum, and when the temperature sensor of the electromagnetic killing drum detects and displays a temperature ≥280°C, start electromagnetic killing; set: the speed of the killing drum is 14-16r / min, the electromagnetic killing temperature is 220-250°C, the electromagnetic killing time is 2.5-3.5min, the hot air temperature of the first hot air output pipe is ≥90°C, and the air volume is 250-300 cubic meters / min;

[0013] 3) 5-7 minutes in advance, turn on the electric heating pipe and blower in the hot air fixing tank heating cabin to heat the hot air fixing tank, and 2-3 minutes in advance, start the auger leaf turner, and when the sensor of the hot air fixing tank detects and displays that the temperature is ≥95°C, hot air fixing is performed; set: the speed of the auger leaf turner is 10-15r / min, the hot air temperature output by the second hot air output pipe and the third hot air output pipe is 95-98°C, the air volume is 600-800 cubic meters / min, the vibration frequency of the trough bottom screen is 100-150 times / min, and the hot air fixing time is 4-6 minutes;

[0014] 4) Recovery and purification of moist hot air: Cover the trough cover 1-2 minutes in advance. When the tea leaves and moist hot air after electromagnetic withering enter the hot air withering trough, immediately start the moist hot air recovery, heating and purification device to recover the moist hot air and heat and purify it. When the hot air temperature is ≥95℃, open the 4 flow valves to send the heated and purified hot air to the electromagnetic withering drum and the hot air withering trough respectively for circulating heating and reuse.

[0015] Beneficial effects of the present invention: The present invention combines a conveyor belt for removing impurities, an electromagnetic tea-fixing drum, and a hot air tea-fixing trough into a continuous tea-fixing machine. The impurities carried in the tea leaves are first removed by the conveyor belt for removing impurities, and then the electromagnetic radiation heat energy of the electromagnetic tea-fixing drum is used to penetrate into the inner layer of the tea leaves for a stuffy tea-fixing process, which quickly kills the polyphenol oxidase activity in the inner layer of the tea leaves and prevents the red-changing reaction. Then, the hot air tea-fixing trough is used for a secondary penetration tea-fixing process to efficiently volatilize the moist hot gas, promote the volatilization of aromatic substances, and improve the aroma. The technical limitation of the existing drum-type tea-fixing machine that it is difficult to quickly emit and eliminate the moist hot gas that affects the tea-fixing quality can be overcome. The moist hot gas recovery, heating, and purification device recycles and reuses the moist hot gas in the hot air tea-fixing trough, thereby effectively improving the utilization rate of heat and achieving energy conservation and emission reduction.

[0016] A hot air pipe is arranged inside the electromagnetic withering drum. The hot air can not only wither the tea leaves, but also separate the tea leaves from the inner wall of the electromagnetic withering drum in time, to avoid the tea leaves from being in contact with the inner wall of the drum for too long and causing burnt edges. Hot air pipes are arranged on both sides of the hot air withering groove, and combined with the air outlet structure of the auger leaf turner, a three-dimensional hot air withering is formed, which is conducive to evenly and thoroughly withering the buds and leaves, promoting the volatilization of aromatic substances and improving the aroma.

[0017] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the present invention.

[0019] Figure 2 It is a front view of the feeding and impurity removing conveyor belt in the present invention.

[0020] Figure 3It is the front view of the electromagnetic killing roller in the present invention.

[0021] Figure 4 It is a side view of the U-shaped heating tank in the present invention.

[0022] Figure 5 It is a front view of the hot air killing tank in the present invention.

[0023] Figure 6 It is a cross-sectional view of the auger leaf turning device in the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the wet hot gas recovery, heating and purification device in the present invention. DETAILED DESCRIPTION

[0025] Example 1: Figures 1 to 7 As shown, a continuous tea-fixing machine includes an electromagnetic tea-fixing drum 1 and a hot air tea-fixing trough 2 connected to the discharge port of the electromagnetic tea-fixing drum 1, and tea leaves are fixed by the electromagnetic tea-fixing drum 1 and the hot air tea-fixing trough 2, respectively. A feeding impurity removal conveyor belt 3 is also provided at the feeding end of the electromagnetic tea-fixing drum 1 to remove impurities from the tea leaves. An intelligent control device 4 is also provided for intelligent control. A humid hot steam recovery heating purification device 25 is also provided on the hot air tea-fixing trough 2, and the humid hot steam recovery heating purification device 25 quickly absorbs the humid heat and recycles it, thereby improving energy efficiency.

[0026] Specifically: the feeding and impurity removal conveyor belt 3 is a 10-12 mesh stainless steel mesh conveyor belt, the feeding end of the feeding and impurity removal conveyor belt 3 is low, the discharging end is high, and the overall inclination is 8-10 degrees. A feeding hopper 33 is arranged above the feeding end, and the feeding hopper 33 is in the shape of a stainless steel trumpet. An exciter 31 is also arranged below the feeding and impurity removal conveyor belt 3, and the exciter 31 drives the feeding and impurity removal conveyor belt 3 to vibrate, so that the feeding and impurity removal conveyor belt 3 can screen out the insect eggs, fibers, broken tea powder, dust and other debris entrained in the buds and leaves in the process of conveying the buds and leaves upwardly.

[0027] The feeding impurity removal conveyor belt 3 is also provided with two magnetic rods 32, which are permanent magnetic electromagnetic rods with a diameter of Φ150mm. One magnetic rod 32 is arranged horizontally at the feeding end of the feeding impurity removal conveyor belt 3, and the other magnetic rod 32 is arranged horizontally at the discharge port of the feeding impurity removal conveyor belt 3, and rotates at 25-30r / min, and after two magnetic suctions, the magnetic metal rust impurities carried in the tea leaves are removed. When the tea buds and leaves are sterilized into the feeding hopper 33, the first magnetic rod begins to absorb the magnetic metal rust impurities, and in the process of upward transportation, the feeding impurity removal conveyor belt 3 is driven to vibrate through the exciter 31, and the eggs, fibers, broken tea powder, dust and sundries carried in the tea buds and leaves are screened out, and then the second magnetic rod 32 is used for the second adsorption, and finally the cleaned tea buds and leaves are input into the electromagnetic sterilization drum 1 for sterilization.

[0028] The electromagnetic fixing cylinder 1 comprises a fixing cylinder 11 and an electromagnetic heater 12 for heating the fixing cylinder 11 .

[0029] The green-fixing drum 11 is a cylindrical conical structure with a length of 1.2-1.5m and a diameter of 60cm. The front end is a cylinder and the rear part is a cone. The cone structure at the rear end is used to collect the hot and humid air and the green-fixing leaves for centralized output. In order to make the buds and leaves fix green evenly, the green-fixing drum 11 is designed as a double-layer structure, the inner layer of which is made of stainless steel material, and the advantage of fast thermal conductivity is used to promote the green-fixing of the buds and leaves. The outer layer is made of composite titanium steel material, and the advantage of good thermal insulation is used to prevent the heat and temperature in the drum from radiating, so that the buds and leaves are heat-insulated and evenly fixed. In order to promote the smooth input of the buds and leaves into the hot air fixing groove 2 after electromagnetic fixing, the feeding end of the green-fixing drum 11 is high, the discharging end is low, and the whole is arranged at an angle of 3-5°. The clockwise rotation force of the drum body is used to push the tea leaves and the hot and humid air into the hot air fixing groove 2 together.

[0030] The electromagnetic heater 12 includes a U-shaped heating groove 121 supported below the green-fixing drum 11, an electromagnetic coil 122 arranged in the U-shaped heating groove 121, a frequency converter 123 and an electromagnetic generator 124 connected to the electromagnetic coil 122. The electromagnetic coil 122 is divided into two groups, which are laid at the bottom of the U-shaped heating groove 121 at an interval of 4.5-5.5 cm. The electromagnetic heat energy generated by the conversion between the frequency converter and the electromagnetic generator is used to directly radiate and heat the green-fixing drum, which can overcome the technical limitations of conventional electric heating pipes, which first heat the air and then heat the drum body by the hot air, and easily lose heat energy by "two-way heat energy transfer". The heat energy conversion rate can be increased by 5-7%, and the heat energy utilization rate is about 10%. The U-shaped heating groove 121 is a double-layer structure, the inner layer is made of composite titanium steel material, and the outer layer is wrapped with silicate fiber asbestos material. One-third of the green-fixing drum body 11 is embedded in the U-shaped heating groove 121, which can prevent the electromagnetic radiation heat energy from expanding outward, so as to reduce heat loss and improve thermal efficiency.

[0031] The hot air sterilization tank 2 includes a tank body 21 and an auger leaf turner 22 arranged in the tank body 21. The tank body 21 is made of cast iron material, with a tank length of 2.8 meters, a tank width of 0.65 meters, a tank height of 1.5 meters, and a tank depth of 0.8 meters. The bottom of the tank body 21 is a 10-12 mesh stainless steel screen, which carries the buds and leaves for hot air sterilization. At the same time, an exciter 31 is also provided at the bottom of the tank body 21, and the exciter 31 is used to drive the stainless steel screen to vibrate to screen out the burnt tea powder and tea ash debris produced during sterilization. In order to facilitate the smooth output of the buds and leaves after hot air sterilization, the feed end of the tank body 21 is high, the discharge end is low, and the whole is inclined at 6-7 degrees. The vibration of the tank bottom and the thrust of the auger leaf turner 22 are used to move the tea leaves toward the discharge port for discharge.

[0032] A slot cover 23 is provided above the slot body 21, which is made of transparent quartz glass, and has the same length and width as the tea-withering slot body. A suction fan 24 is connected to the slot cover 23, and a moist hot gas recovery, heating and purification device 25 is connected to the suction fan 24. When hot air withering, the slot body 21 is covered so that the moist hot gas can be sucked into the moist hot gas recovery, heating and purification device 25 through the suction fan 24, and heated, converted, purified and recycled, which is beneficial to energy saving and emission reduction, improving thermal efficiency and optimizing tea quality. At the same time, the color change of the tea leaves with hot air withering can be observed through the transparent slot cover 23, so as to better control the withering quality.

[0033] The auger leaf turner 22 is made of stainless steel, 2.6 meters long, and has a hollow cylindrical microporous air cavity structure, that is, a hot air cavity 222 is provided in the auger leaf turner 22, and a group of air outlet holes 223 connected to the hot air cavity 222 are evenly distributed on the auger leaf turner 22, and the air outlet holes 223 are 80-100 mesh micropores. The auger leaf turner 22 is arranged along the length direction of the tank body 21, arranged in the center of the tank body 21, and its cylindrical diameter is 6-8cm. One end of the hot air cavity 222 is connected to the hot air output pipe of the moist hot gas recovery heating and purification device 25, and the hot air is blown into the fixing tank through the air outlet holes 223 to perform hot air fixing.

[0034] The auger leaf turning device 22 is provided with 6 leaf turning claws 221 at intervals. The leaf turning claws 221 adopt a toothed structure and are cross-arranged on the auger leaf turning device 22 at intervals of 35-40 cm. Driven by the servo motor, the auger leaf turning device 22 rotates clockwise to drive the leaf turning claws to turn the tea leaves for hot air killing. At the same time, the moist hot air is also lifted and volatilized upward so that the suction fan can suck it into the moist hot air recovery heating purification device 25 for heating conversion purification and recycling.

[0035] The wet hot gas recovery heating and purification device 25 comprises a cylindrical shell 251, a heating chamber 252 and a purification chamber 253 arranged in the shell 251, and a hot air output device 257. The shell 251 is a cylinder made of titanium steel with a length of 1.5-1.8 meters and a diameter of 50-55 cm. The heating chamber 252 and the purification chamber 253 are placed in the shell 251 to recover the wet hot gas generated during the electromagnetic hot air killing. The hot gas is first converted into hot air through the electric heating pipe of the heating chamber 252, and then the odor impurities are eliminated by the purification chamber 253, and then the cleaned hot air is returned to the electromagnetic killing drum 1 and the hot air killing tank 2 for heating and killing, so as to achieve energy saving, emission reduction and recycling.

[0036] The tank cover 23 is provided with three suction ducts 241, which are arranged at intervals of 60-70 cm. The other end of the suction duct 241 is connected to the suction fan 24, and the suction force of the suction motor 24 is used to make the hot and humid air in the tank body 21 enter the heating chamber 252 and convert it into hot air.

[0037] The heating chamber 252 is a small cylinder with a length of 0.5-0.6 meters and a diameter of 20-30 cm, arranged at the front end of the housing 251, and is provided with a group of electric heating pipes 2521, which can convert the moist hot steam into hot air above 95°C and then input it into the purification chamber 253. In order to prevent the heat energy from dissipating and improve the thermal efficiency, a heat-insulating layer 2522 of asbestos fiber material is also wrapped outside the heating chamber 252.

[0038] The purification cabin 253 is a conical cylinder with a length of 0.4-0.5 meters and a diameter of 15-20 cm, which is arranged at a distance of 10-15 cm from the heating cabin 252. The purification cabin 253 is equipped with two impurity and odor removal purifiers, namely, fine filtration and ultrafiltration. The fine filtration impurity removal purifier 2531 is a stainless steel laser microporous filter, which first filters the fine impurities entrained in the hot air. The ultrafiltration odor removal purifier 2532 is a silicon carbide ceramic filter, which is arranged at a distance of 8-10 cm in front of the conical cylinder. The conical cylinder can be used to collect hot air, and then it can be used to filter and remove the entrained smoke and burnt odor.

[0039] The hot air output device 257 includes a blower 2571, a flow valve 2572 and a group of hot air output pipes. The blower 2571 is a high-pressure vortex blower, which is arranged between the heating chamber 252 and the purification chamber 253. It blows the converted hot air into the purification chamber 253, and outputs it after being purified by the stainless steel laser microporous filter and the silicon carbide ceramic filter. There are 4 flow valves 2572 arranged at the outlet of the purification chamber 253, which are respectively connected to 4 hot air output pipes, and distribute and control the flow of hot air, which is respectively output to the electromagnetic killing green drum 1 and the hot air killing green tank 2.

[0040] The hot air output pipe includes a first hot air output pipe 254 whose air outlet is located at the discharge end of the fixing drum 11 and blows toward the inner wall of the fixing drum 11, a second hot air output pipe 255 whose air outlet is located at both sides of the feeding end of the trough body 21 and blows toward the two side walls of the trough body 21, and a third hot air output pipe 256 connected to one end of the auger leaf turner 22; the first hot air output pipe 254 blows hot air in the reverse direction toward the inner wall of the fixing drum 11 to blow away the buds and leaves stuck on the drum wall; the third hot air output pipe 256 is connected to the hot air chamber 222 of the auger leaf turner 22, and blows hot air into the fixing trough through the air outlet 223 to perform hot air fixing; the two second hot air output pipes 255 blow hot air in the forward direction toward the left and right sides of the trough walls, which can not only form a three-dimensional hot air space for fixing, but also blow away the buds and leaves stuck on the trough wall to prevent carbonization from affecting the fixing quality.

[0041] The intelligent control device 4 is a PLC program-controlled touch screen, which is connected to the feeding and impurity removal conveyor 3, the electromagnetic fixing drum 1, the hot air fixing trough 2, and the moist hot air recovery and purification heating device 25, and intelligently sets the rotation speed of the magnetic bar, the vibration frequency of the vibrating screen, the rotation speed of the fixing drum, the electromagnetic fixing temperature, the electromagnetic fixing time, the rotation speed of the "auger leaf turner", the hot air fixing temperature, the hot air blowing volume, the vibration frequency of the impurity removal vibrating screen, and the hot air fixing time, so as to perform intelligent electromagnetic hot air fixing and vibration impurity removal and transportation.

[0042] Embodiment 2: The method for operating tea leaves by using the continuous tea-withering machine described in Embodiment 1 comprises the following steps:

[0043] 1) Impurity removal and feeding conveying: 3-5 minutes in advance, turn on the magnetic bar and vibrator on the feeding impurity removal conveyor, and then feed the material; set: the speed of the magnetic bar is 25-30r / min, and the vibration frequency of the vibrator is 90-100 times / min; use two rotating magnetic bars to absorb the metal rust impurities entrained in the tea leaves twice, and use the feeding impurity removal conveyor belt to screen out insect bodies, eggs, fibers, broken tea leaves, dust and impurities, so that the clean buds and leaves can be input into the electromagnetic withering drum;

[0044] 2) Electromagnetic killing: 8-10 minutes in advance, turn on the electromagnetic heater of the electromagnetic killing drum, and when the temperature sensor of the electromagnetic killing drum detects and displays a temperature ≥280°C, start electromagnetic killing; set: the speed of the killing drum is 14-16r / min, the electromagnetic killing temperature is 220-250°C, the electromagnetic killing time is 2.5-3.5min, the hot air temperature of the first hot air output pipe is ≥90°C, and the air volume is 250-300 cubic meters / min;

[0045] 3) 5-7 minutes in advance, turn on the electric heating pipe and blower in the hot air fixing tank heating cabin to heat the hot air fixing tank, and 2-3 minutes in advance, start the auger leaf turner, and when the sensor of the hot air fixing tank detects and displays that the temperature is ≥95°C, hot air fixing is performed; set: the speed of the auger leaf turner is 10-15r / min, the hot air temperature output by the second hot air output pipe and the third hot air output pipe is 95-98°C, the air volume is 600-800 cubic meters / min, the vibration frequency of the trough bottom screen is 100-150 times / min, and the hot air fixing time is 4-6 minutes;

[0046] 4) Recovery and purification of moist hot air: Cover the trough cover 1-2 minutes in advance. When the tea leaves and moist hot air after electromagnetic withering enter the hot air withering trough, immediately start the moist hot air recovery, heating and purification device to recover, heat and purify the moist hot air. When the hot air temperature is ≥95℃, open the 4 flow valves to send the heated and purified hot air to the electromagnetic withering drum and the hot air withering trough respectively for circulating heating and reuse.

[0047] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A continuous fixing machine, characterized in that: It comprises an electromagnetic killing green tea drum (1) and a hot air killing green tea tank (2) connected to the discharge port of the electromagnetic killing green tea drum (1); The electromagnetic killing roller (1) comprises a killing roller (11) and an electromagnetic heater (12) for heating the killing roller (11); the feeding end of the killing roller (11) is high, the discharging end is low, and the whole is arranged at an inclination of 3-5 degrees; The hot air killing trough (2) comprises a trough body (21), wherein the feeding end of the trough body (21) is high and the discharging end is low, and the whole is inclined at 6-7 degrees; an auger leaf turning device (22) is arranged in the trough body (21), the auger leaf turning device (22) is arranged along the length direction of the trough body (21), and a group of leaf turning claws (221) are arranged at intervals on the auger leaf turning device (22); a trough cover (23) is arranged above the trough body (21), and a suction fan (24) is connected to the trough cover (23), and a humid hot gas recovery heating purification device (25) is connected to the suction fan (24), and the humid hot gas recovery heating purification device (25) is arranged on the trough body (21). A group of hot air output pipes are provided, including a first hot air output pipe (254) whose air outlet is located at the discharge end of the killing drum (11) and blows toward the inner wall of the killing drum (11), a second hot air output pipe (255) whose air outlet is located at both sides of the feeding end of the trough body (21) and blows toward the two side walls of the trough body (21), and a third hot air output pipe (256) connected to one end of the auger leaf turning device (22); a hot air cavity (222) connected to the third hot air output pipe (256) is provided in the auger leaf turning device (22), and a group of air outlet holes (223) connected to the hot air cavity (222) are evenly distributed on the auger leaf turning device (22).

2. The continuous fixing machine according to claim 1, characterized in that: The air outlet hole (223) communicated with the hot air cavity (222) is a micro-pore with a mesh size of 80-100.

3. The continuous fixing machine according to claim 1, characterized in that: A feed impurity removal conveyor belt (3) is disposed at the feed end of the electromagnetic killing drum (1), and the feed impurity removal conveyor belt (3) is a screen conveyor belt. The feed end of the feed impurity removal conveyor belt (3) is low, and the discharge end is high, and the whole is inclined at 8-10 degrees. An exciter (31) is also disposed below the feed impurity removal conveyor belt (3).

4. The continuous fixing machine as claimed in claim 3, characterized in that: The feeding and impurity removal conveyor belt (3) is also provided with two magnetic bars (32), which are respectively located at the feeding end and the discharging end of the feeding and impurity removal conveyor belt (3).

5. The continuous fixing machine according to claim 1, characterized in that: The killing roller (11) is a two-layer structure, the inner layer is made of stainless steel material, and the outer layer is made of composite titanium steel material.

6. The continuous fixing machine according to claim 1, characterized in that: The electromagnetic heater (12) comprises a U-shaped heating groove (121) supported below the killing drum (11), an electromagnetic coil (122) arranged in the U-shaped heating groove (121), a frequency converter (123) and an electromagnetic generator (124) connected to the electromagnetic coil (122).

7. The continuous fixing machine according to claim 1, characterized in that: The bottom of the tank (21) is a 10-12 mesh stainless steel screen.

8. The continuous fixing machine according to claim 1, characterized in that: The wet hot gas recovery, heating and purification device (25) comprises a cylindrical outer shell (251), a heating chamber (252) and a purification chamber (253) arranged in the outer shell (251).

9. The method for using the continuous tea-withering machine according to any one of claims 1 to 8 to wither tea leaves, characterized in that: The following steps are involved: 1) Impurity removal and feeding conveying: 3-5 minutes in advance, turn on the magnetic bar and vibrator on the impurity removal feeding conveyor, and then feed the material; Setting: The speed of the magnetic bar is 25-30r / min, and the vibration frequency of the vibrator is 90-100 times / min; two rotating magnetic bars are used to absorb the metal rust impurities in the tea leaves twice, and at the same time, the feeding impurity removal conveyor belt is used to screen out insect bodies, eggs, fibers, broken tea leaves, dust and impurities, so that the clean buds and leaves can be input into the electromagnetic withering drum; 2) Electromagnetic killing: 8-10 minutes in advance, turn on the electromagnetic heater of the electromagnetic killing drum. When the temperature sensor of the electromagnetic killing drum detects and displays a temperature ≥280°C, start electromagnetic killing; Settings: The speed of the fixing drum is 14-16r / min, the electromagnetic fixing temperature is 220-250℃, the electromagnetic fixing time is 2.5-3.5min, the hot air temperature of the first hot air output pipe is ≥90℃, and the air volume is 250-300 cubic meters / min; 3) 5-7 minutes in advance, turn on the electric heating tube and blower in the hot air withering tank heating chamber to heat the hot air withering tank, and 2-3 minutes in advance, start the auger leaf turner, and when the sensor of the hot air withering tank detects and displays a temperature ≥95°C, hot air withering is carried out; Setting: The rotation speed of the auger leaf turner is 10-15r / min, the hot air temperature output by the second hot air output pipe and the third hot air output pipe is 95-98℃, the air volume is 600-800 cubic meters / min, the vibration frequency of the trough bottom screen is 100-150 times / min, and the hot air fixing time is 4-6 minutes; 4) Recovery and purification of moist hot air: Cover the trough cover 1-2 minutes in advance. When the tea leaves and moist hot air after electromagnetic withering enter the hot air withering trough, immediately start the moist hot air recovery, heating and purification device to recover, heat and purify the moist hot air. When the hot air temperature is ≥95℃, open the 4 flow valves to send the heated and purified hot air to the electromagnetic withering drum and the hot air withering trough respectively for circulating heating and reuse.

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