A production line and method for lotus node carbon

Abstract

The present application relates to lotus root node processing technical field, specifically to a kind of lotus root node carbon production line and production method, including the lotus root node cleaning device, drain lifting conveying line, pre-drying conveying line, stir-frying device and spray carbon-killing device connected in turn;Stir-frying device includes furnace body and stir-frying cylinder, which is rotatably arranged in furnace body, and stirring guide plate is arranged on the inner wall of stir-frying cylinder, and drive is arranged on the furnace body for driving stir-frying cylinder to rotate;One end of stir-frying cylinder is connected with pre-drying conveying line;One end of stir-frying cylinder discharge is communicated with furnace body through ash pipe;It further includes hot air drying device, and the inlet end is heat exchange connected with the exhaust port of furnace body, and hot air drying device supplies hot air to finished product drying box and pre-drying conveying line in turn through exhaust pipe, and hot air drying device is communicated with the feeding end of stir-frying cylinder through blowing pipe and can be opened and closed.This lotus root node carbon production line and production method can realize automatic production, reduce production cost and labor intensity, and production efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of lotus root processing technology, specifically to a lotus root charcoal production line and production method. Background Technology

[0002] Lotus root nodes are a type of astringent and hemostatic medicinal material, consisting of the dried rhizome nodes of the lotus plant (Nelumbo nucifera), a member of the Nymphaeaceae family. They possess astringent, hemostatic, and blood-stasis-removing properties; they are primarily used for hematemesis, hemoptysis, epistaxis, hematuria, and metrorrhagia. While fresh lotus root nodes also have medicinal value, their long shelf life limits their medicinal value. Therefore, in traditional Chinese medicine, fresh lotus root nodes are typically processed using specific techniques to obtain lotus root charcoal, which can be stored for a long time and has higher medicinal value.

[0003] The processing of lotus root nodes mainly falls into two categories: raw lotus root nodes and charred lotus root nodes. Their processing purposes and specific steps differ. The purpose of processing raw lotus root nodes is primarily to preserve their original efficacy, focusing on promoting blood circulation and stopping bleeding. The processing involves removing impurities, washing, and drying, and is relatively simple. Charred lotus root nodes, on the other hand, are processed to enhance their astringent and hemostatic effects, often used for chronic bleeding. The processing is more traditional, involving pre-cleaning fresh lotus root nodes and then stir-frying them in a pot over a high heat for about half an hour. During this process, constant manual stirring is necessary to prevent charring. Because fresh lotus root nodes contain some moisture, initial contact with the high-temperature wok generates a large amount of steam. Later, the dried outer layer of the lotus root nodes is ignited by the high temperature, resulting in incomplete combustion in some areas, producing sparks and a large amount of smoke. The entire processing is not only time-consuming and labor-intensive but also takes place in a harsh environment.

[0004] Regarding the issue of lotus root charcoal processing, patent CN216702970U discloses a charcoal-making device for lotus root charcoal production. Through the cooperation of various components, the device enables rapid stir-frying of lotus root segments during the charcoal production process, saving manpower and accelerating production efficiency. Furthermore, the finished charcoal can be quickly removed, eliminating manual operation and achieving automated production. However, this patent uses a motor-driven flap to simulate manual stir-frying. Especially when the lotus root charcoal accumulates on the heating plate, and the flap's rotation position is fixed relative to the heating plate, some lotus root segments on the heating plate cannot be stir-fried, resulting in missed stir-frying and directly affecting the processing of the lotus root segments. Meanwhile, when lotus root segments are stir-fried on the heating plate, a lot of ash and debris are easily generated, which tend to stick to or scatter on the box during the stir-frying process. The unloading component simply pours out the charcoal from the stir-fried lotus root segments, and the ash and debris remaining on it cannot be removed. As a result, when fresh lotus root segments are put in, these ash and debris will directly stick to the surface of the fresh lotus root segments that are still moist. In addition to affecting the appearance of the finished product, the ash and debris can also easily absorb the moisture emitted by the fresh lotus root segments during the stir-frying process and form a dense ash shell, which in turn affects the normal stir-frying of the fresh lotus root segments and the quality of the final product. Summary of the Invention

[0005] In order to overcome one of the shortcomings of the prior art, the purpose of this invention is to provide a lotus root charcoal production line and production method. This lotus root charcoal production line and production method can realize automated production, reduce production costs and labor intensity, and achieve high production efficiency.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0007] A lotus root charcoal production line includes a lotus root washing device for washing lotus roots after removing roots; a draining and lifting conveyor line for lifting and draining the washed lotus roots from the washing device; a pre-drying conveyor line for receiving and drying the lotus roots output from the draining and lifting conveyor line; and a stir-frying device including a furnace body and a stir-frying cylinder rotatably disposed within the furnace body. The inner wall of the stir-frying cylinder is provided with a stirring guide plate, and the furnace body is provided with a driver for driving the stir-frying cylinder to rotate. Both ends of the stir-frying cylinder are openable and closable. One end of the stir-frying cylinder can receive... The lotus root sections output by the pre-drying conveyor line; the discharge end of the stir-frying drum is connected to the furnace body through an ash discharge pipe; a spray char extinguishing device is used to receive the lotus root section char discharged from the stir-frying drum and spray it to extinguish any sparks; a finished product drying box is used to receive the lotus root section char discharged from the spray char extinguishing device; a hot air drying device has its inlet end connected to the exhaust port of the furnace body for heat exchange, and the hot air drying device supplies hot air to the finished product drying box and the pre-drying conveyor line through an exhaust pipe, and the hot air drying device is connected to the feed end of the stir-frying drum through an air blowing pipe.

[0008] In some possible implementations, the furnace body is provided with a feed hopper adapted to one end of the stir-frying drum, and the furnace body is provided with a discharge hopper adapted to the other end of the stir-frying drum. Both the feed hopper and the discharge hopper can be opened and closed. Both the feed hopper and the discharge hopper can rotate relative to the stir-frying drum. The feed hopper is connected to the output end of the pre-drying conveyor line, the discharge hopper is connected to the inlet end of the spray charcoal extinguishing device, the outlet end of the blower pipe is connected to the bottom of the feed hopper, and the inlet end of the ash discharge pipe is connected to the side of the discharge hopper.

[0009] In some possible implementations, an external gear ring is provided on the outer wall of one end of the stir-frying cylinder, and a gear that meshes with the external gear ring is provided on the rotating end of the driver.

[0010] In some possible implementations, mounting steps are provided on the outer walls of both ends of the stir-frying drum, and fireproof limiting platforms are provided on the mounting steps. The two mounting steps are installed through mounting holes in the side wall of the furnace body via bearings. The two fireproof limiting platforms are used to block the ports of the corresponding mounting holes near the furnace body. The feed hopper and discharge hopper are respectively fitted onto the ends of the two mounting steps that protrude from the corresponding mounting holes. The inner walls of the corresponding ends of the feed hopper and discharge hopper are provided with step portions adapted to the mounting steps.

[0011] In some possible implementations, the hopper is provided with an ash outlet at the end away from the stir-frying drum, and a flange joint is provided on the ash outlet, which is connected to the inlet end of the ash discharge pipe; a grid is provided between the ash outlet and the flange joint.

[0012] In some possible implementations, the stir-frying device further includes a suction mechanism comprising a negative pressure pump and a suction pipe. The negative pressure pump is mounted on the outer wall of the furnace body. One end of the suction pipe is connected to the negative pressure pump, and the other end is connected to a connector. The connector is connected to the discharge hopper, and an installation cavity is provided inside the connector. A filter screen is installed inside the installation cavity. A scraper is slidably mounted on the air inlet side of the filter screen in the installation cavity. The scraper can scrape off dust on the air inlet side of the filter screen. A drive rod is connected to the scraper and extends movably through the connector. A drive cylinder is provided on the connector and is connected to the drive rod.

[0013] In some possible implementations, the spray charcoal extinguishing device includes a housing, a spray pipe disposed within the housing, and a water tank. The housing is provided with a feed inlet connected to the discharge end of the stirring drum. The water tank is connected to the spray pipe via a water supply pipe, and a pump is disposed on the water supply pipe. A tilting plate is rotatably disposed within the housing, and a tilting motor for driving the tilting plate to rotate is disposed on the housing.

[0014] In some possible implementations, the pre-drying conveyor line includes a frame, a mesh conveyor belt rotatably mounted on the frame, and a heat-insulating cover over the mesh conveyor belt. One end of the mesh conveyor belt can receive fresh lotus root sections discharged from the draining and lifting conveyor line, and the other end of the mesh conveyor belt is connected to the feed end of the stir-frying drum. A warm air pipe is arranged inside the heat-insulating cover, and several nozzles are provided on the warm air pipe. The outlets of the nozzles all point towards the mesh conveyor belt, and the warm air pipe is connected to an exhaust pipe. At least one support roller is provided on the frame, and a cam is provided on the support roller. The outer periphery of the cam abuts against the back of the mesh conveyor belt. A vibrating motor for driving the rotation of the support roller is provided on the frame.

[0015] In some possible implementations, the hot air drying device includes an air compressor, a filter, and a heat exchanger. The filter is located at the air inlet of the air compressor, and the air outlet of the air compressor is connected to the air inlet of the exhaust pipe. The heat exchanger is located in the area between the air compressor and the finished product drying chamber on the exhaust pipe, and the heat exchanger is connected to the exhaust port of the furnace body for heat exchange. The inlet of the blowing pipe is connected to the area between the air compressor and the heat exchanger on the exhaust pipe, and both the blowing pipe and the exhaust pipe are equipped with control valves.

[0016] A method for producing lotus root charcoal includes the following steps:

[0017] Step S100: Remove the roots and impurities from the fresh lotus root nodes, and then clean them using a lotus root node cleaning device.

[0018] Step S200: Fresh lotus root sections that have been cleaned by the draining and lifting conveyor line and the draining and washing device.

[0019] Step S300: Dry fresh lotus root sections via a pre-drying conveyor line;

[0020] Step S400: Place the dried fresh lotus root sections into the stir-frying drum, close the feed hopper and discharge hopper, and drive the stir-frying drum to rotate in the forward direction. The stir-frying temperature is 220-300℃ and the stir-frying time is 15-23 minutes to obtain lotus root section charcoal.

[0021] Step S500: After the stir-frying is completed, open the discharge hopper, and the driver drives the stir-frying drum to rotate in the opposite direction, so that the stir-fried lotus root charcoal falls into the spray charcoal extinguishing device; after all the lotus root charcoal in the stir-frying drum has fallen into the spray charcoal extinguishing device, close the discharge hopper and open the blower pipe and ash discharge pipe at the same time, use the airflow discharged from the hot air drying device to blow the inner wall of the stir-frying drum, and blow the fine charcoal particles remaining in the stir-frying drum into the furnace body, and then close the blower pipe and ash discharge pipe; open the feed hopper to re-feed, and repeat the above stir-frying operation;

[0022] Step S600: Spray water mist into the charcoal spraying device to extinguish the sparks on the lotus root charcoal and cool the lotus root charcoal.

[0023] Step S700: The lotus root section charcoal discharged from the spray charcoal extinguishing device is received by the finished product drying box and dried with hot air to obtain the finished lotus root section charcoal.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] This invention discloses a lotus root charcoal production line that performs multi-stage pretreatment of fresh lotus roots with high moisture content by setting up a lotus root washing device, a draining and lifting conveyor line, and a pre-drying conveyor line. This effectively reduces the moisture content of the material entering the stir-frying device and solves the problems of high energy consumption and easy clumping during direct carbonization of lotus roots. It significantly improves processing efficiency and reduces labor intensity. The stir-frying device uses a closed stir-frying cylinder, combined with a turning guide plate, to achieve uniform carbonization of the lotus roots and reduce heat loss. Furthermore, a spray charcoal extinguishing device is installed at the discharge end of the stir-frying device to promptly extinguish sparks on the surface of the lotus root charcoal, preventing combustion of the finished product upon contact with air and ensuring safe discharge. Simultaneously, this production line utilizes a hot air drying device to recover the waste heat from the high-temperature flue gas discharged from the furnace and supplies hot air in stages to the finished product drying box and the pre-drying conveyor line, respectively achieving the drying of the finished product and the dehydration of the fresh lotus roots, realizing efficient energy recycling. The entire production line is rationally designed, highly automated, energy-saving, and environmentally friendly. This production method is simple to operate. In addition to continuous stirring, the stirring drum can also simulate the process of charcoal making in the absence of oxygen, which can speed up the forming speed of lotus root charcoal, reduce overall energy consumption, and improve processing efficiency.

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the pre-drying conveyor line in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the stir-frying device in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the internal structure of the stir-frying device in an embodiment of the present invention;

[0031] Figure 5 This is a partial structural schematic diagram of the stir-frying device in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the internal structure of the spray charcoal extinguishing device in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the connection structure of the hot air drying device in an embodiment of the present invention.

[0034] Explanation of icon numbers:

[0035] Lotus root cleaning device 10;

[0036] 20-meter-long draining and lifting conveyor line;

[0037] 30. Pre-drying conveyor line, 31. frame, 32. mesh conveyor belt, 33. heat insulation cover, 34. warm air duct, 35. support roller, 36. cam, 37. vibrating motor;

[0038] Stirring device 40, furnace body 41, stirring cylinder 42, stirring guide plate 43, driver 44, ash discharge pipe 45, feed hopper 46, discharge hopper 47, external gear ring 48, mounting step 49, fireproof limit platform 4a, bearing 4b, ash outlet 4c, flange joint 4d.

[0039] Spray charcoal extinguishing device 50, box body 51, spray pipeline 52, water tank 53, feed inlet 54, water supply pipe 55, pump body 56, tipping plate 57, tipping motor 58;

[0040] Finished product drying oven 60;

[0041] Hot air drying device 70, exhaust pipe 71, blower pipe 72, heat exchanger 73, control valve 74, filter 75, air compressor 76;

[0042] Suction mechanism 80, negative pressure pump 81, suction pipe 82, connector 83, mounting cavity 84, filter screen 85, scraper 86, drive cylinder 87. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0044] See Figures 1 to 7 This invention provides a lotus root charcoal production line, including a lotus root washing device 10, a draining and lifting conveyor line 20, a pre-drying conveyor line 30, a stir-frying device 40, a spray charcoal scavenging device 50, a finished product drying box 60, and a hot air drying device 70. The lotus root washing device 10 is used to wash the lotus roots after the roots have been removed, typically using bubble washing or drum washing methods to remove surface mud and sand. The draining and lifting conveyor line 20 is used to lift and drain the washed lotus roots from the washing device 10; it is typically a mesh chain conveyor belt, arranged at an upward inclination, allowing water to drip naturally under gravity during the lifting process. The pre-drying conveyor line 30 receives and dries the lotus roots output from the draining and lifting conveyor line 20, performing preliminary surface dehydration on the lotus roots. The stir-frying device 40 includes a furnace body 41 and a stir-frying cylinder 42 rotatably disposed within the furnace body 41. A turning guide plate 43 is provided on the inner wall of the stir-frying cylinder 42. A driver 44 for driving the rotation of the stir-frying cylinder 42 is provided on the furnace body 41. Both ends of the stir-frying cylinder 42 can be opened and closed. One end of the stir-frying cylinder 42 can receive the lotus root segments output from the pre-drying conveyor line 30. The discharge end of the stir-frying cylinder 42 is connected to the furnace body 41 via an ash discharge pipe 45. A spray charcoal extinguishing device 50 is used to receive the lotus root segment charcoal discharged from the stir-frying cylinder 42 and spray it to extinguish any sparks. A finished product drying box 60 is used to receive the lotus root segment charcoal discharged from the spray charcoal extinguishing device 50 and uses residual heat to perform final drying and shaping. The inlet end of the hot air drying device 70 is connected to the exhaust port of the furnace body 41 for heat exchange. The hot air drying device 70 supplies hot air to the finished product drying box 60 and the pre-drying conveyor line 30 through the exhaust pipe 71. The hot air drying device 70 is connected to the feed end of the stir-frying drum 42 through the blowing pipe 72.

[0045] Specifically, the lotus root cleaning device 10 can be a conventional cleaning device, such as bubble cleaning or ultrasonic cleaning, or the technical solutions in CN202020775514.5-lifting ultrasonic cleaning machine and CN202320650035.4-an ultrasonic cleaning machine. The draining and lifting conveyor line 20 can use a plate chain conveyor belt for transportation, which is a conventional structure and will not be described in detail here. The stir-frying drum 42 is a horizontal closed drum. When it rotates, the inner wall flipping guide plate 43 drives the lotus root sections to continuously flip, ensuring uniform heating and avoiding excessive or insufficient local carbonization. The furnace body 41 is a heating chamber, which can use gas, electric heating, or other methods to provide a carbonization heat source for the stir-frying drum 42. The hot air drying device 70 recovers the waste heat from the exhaust of the furnace body 41 and converts it into hot air to supply the finished product drying and pre-drying processes in sequence, realizing the recycling of heat energy and reducing the overall energy consumption of the production line.

[0046] This production line addresses the high humidity characteristics of lotus root segments by combining multi-stage pretreatment with tiered utilization of waste heat, thus solving the problems of clumping and high energy consumption encountered in traditional carbonization equipment. The hot air drying unit recovers waste heat from the carbonization furnace flue gas, which is used for both finished product drying and raw material pre-drying, significantly improving thermal efficiency.

[0047] See Figure 2 In one embodiment of this application, to facilitate the drying of fresh lotus root sections and improve the efficiency of subsequent stir-frying, the pre-drying conveyor line 30 includes a frame 31, a mesh conveyor belt 32 rotatably mounted on the frame 31, and a heat-insulating cover 33 covering the mesh conveyor belt 32. One end of the mesh conveyor belt 32 can receive the fresh lotus root sections discharged from the draining and lifting conveyor line 20, and the other end of the mesh conveyor belt 32 is connected to the feed end of the stir-frying drum 42. A warm air pipe 34 is arranged inside the heat-insulating cover 33, and several nozzles are provided on the warm air pipe 34. The outlets of the nozzles all point to the mesh conveyor belt 32, and the warm air pipe 34 is connected to the exhaust pipe 71. The hot air generated by the hot air drying device 70 enters the warm air pipe 34 through the exhaust pipe 71 and blows from the nozzles onto the lotus root sections on the mesh conveyor belt 32 to pre-dry them.

[0048] To improve drying uniformity and prevent lotus root sections from sticking to the conveyor belt, at least one support roller 35 is provided on the frame 31. A cam 36 is provided on the support roller 35, and the outer periphery of the cam 36 abuts against the back of the conveyor belt 32. A vibrating motor 37 is provided on the frame 31 to drive the support roller 35 to rotate. When the vibrating motor 37 drives the support roller 35 to rotate, the cam 36 periodically lifts the conveyor belt 32, causing it to vibrate slightly. This causes the lotus root sections to bounce slightly on the conveyor belt and turn over, ensuring that all sides are exposed to hot air and improving drying efficiency.

[0049] See Figure 3and Figure 2 In one embodiment of this application, to achieve a dynamic sealed connection between the stirring drum 42, the pre-drying conveyor line 30, and the spray charcoal extinguishing device 50, the furnace body 41 is provided with a feed hopper 46 adapted to one end of the stirring drum 42, and a discharge hopper 47 adapted to the other end of the stirring drum 42. Both the feed hopper 46 and the discharge hopper 47 can be opened and closed, for example, controlled by a slide valve or a flap valve. Both the feed hopper 46 and the discharge hopper 47 can rotate relative to the stirring drum 42. The feed hopper 46 is connected to the output end of the pre-drying conveyor line 30, and the discharge hopper 47 is connected to the inlet end of the spray charcoal extinguishing device 50. The outlet end of the blowing pipe 72 is connected to the bottom of the feed hopper 46, and the inlet end of the ash discharge pipe 45 is connected to the side of the discharge hopper 47, used to extract some of the dust and flue gas generated during the carbonization process into the furnace body 41 for combustion.

[0050] The main function of the air blower 72 is to blow away the ash and debris inside the stir-frying cylinder 42 after one round of stir-frying of fresh lotus root sections, preventing these ash and debris from affecting the stir-frying of the next batch of fresh lotus root sections. Furthermore, when the air blower 72 is in operation, the feed hopper 46 and discharge hopper 47 are closed. This allows the ash and debris generated during carbonization to be blown into the furnace body 41 through the ash discharge pipe 45 for combustion. This not only ensures the normal stir-frying and quality of the next batch of fresh lotus root sections but also provides combustion assistance to these carbonized debris and dust within the furnace body 41, increasing heat supply and reducing energy consumption – a double benefit. In addition, the feed hopper 46 and discharge hopper 47 are connected to the stir-frying cylinder 42 using a rotary seal design. For example, the areas where the feed hopper 46 and discharge hopper 47 are sealed to the stir-frying cylinder 42 are not within the heating zone of the furnace body 41. Rotary seals are then used in these areas by sealing elements made of high-temperature resistant materials. It should be noted that in this application, the seals between the feed hopper 46 and the discharge hopper 47 and the stir-frying cylinder 42 do not need to be absolutely sealed; gaps can exist between them. Even if external air enters, it will not affect the normal operation of the entire device. In this device, the main purpose of closing the feed hopper 46 and the discharge hopper 47 during the stir-frying process is to reduce the amount of external air entering the stir-frying cylinder 42, preventing this air from contacting the already charred lotus root segments and causing localized complete combustion, i.e., producing sparks and a large amount of smoke. Therefore, even if a small amount of air enters the stir-frying cylinder 42, compared to the traditional wok stir-frying method, the probability of complete combustion of the lotus root segments is lower, reducing stir-frying losses.

[0051] See Figure 3 and Figure 4In the above embodiment, to drive the stir-frying drum 42 to rotate stably, an external gear ring 48 is provided on the outer wall of one end of the stir-frying drum 42, and a gear meshing with the external gear ring 48 is provided on the rotating end of the driver 44. The driver 44 is usually a geared motor, which drives the external gear ring 48 through gear transmission, thereby driving the entire stir-frying drum 42 to rotate at a uniform speed inside the oven body 41.

[0052] See Figure 4 and Figure 5 To ensure the stability and sealing of the stir-frying drum 42, installation steps 49 are provided on the outer walls of both ends of the stir-frying drum 42, and fireproof limiting platforms 4a are provided on each installation step 49. Both installation steps 49 are installed through mounting holes in the side wall of the furnace body 41 via bearings 4b. The two fireproof limiting platforms 4a are used to seal the ports near the furnace body 41 corresponding to the mounting holes, preventing flames and high-temperature flue gas from escaping through the installation gaps. The feed hopper 46 and discharge hopper 47 are respectively fitted onto the ends of the two installation steps 49 that protrude from the corresponding mounting holes. The inner walls of the corresponding ends of the feed hopper 46 and discharge hopper 47 are each provided with stepped portions adapted to the installation steps 49. During installation, the ends of the feed hopper 46 and discharge hopper 47 abut against the outer ring side wall of the corresponding bearing 4b, thereby axially limiting the bearing 4b. This structure allows the feed hopper 46 and discharge hopper 47 to serve as both material channels and clamping components for the bearing 4b, simplifying the assembly structure. The fireproof limiting platform 4a prevents the high temperature inside the furnace body 41 from contacting the bearing 4b, avoiding bearing 4b failure due to high temperature and extending the equipment's service life. The mounting steps 49 and the step portion cooperate to achieve precise positioning and assembly, ensuring the concentricity of the stirring drum 42's rotation and reducing rotational noise and wear. In this application, the furnace wall of the furnace body 41 is constructed with high-temperature resistant bricks, and its outer wall also has a metal shell. Therefore, under normal circumstances, the overall temperature of the two protruding parts of the mounting steps 49 will not be too high. In this application, due to the use of an oxygen-deficient stir-frying method, the overall stir-frying temperature is lower than that of traditional wok stir-frying, reaching approximately 250℃, significantly lower than the 390℃ of traditional woks. Therefore, the bearing 4b can be a high-temperature resistant bearing, and can be lubricated with high-temperature resistant lubricating oil to ensure the normal rotation of the stirring drum 42.

[0053] In some specific embodiments, to facilitate the removal of dust and fumes from the discharge hopper 47, an ash outlet 4c is provided at the end of the discharge hopper 47 away from the stirring drum 42. A flange joint 4d is provided on the ash outlet 4c, and the flange joint 4d is connected to the inlet end of the ash discharge pipe 45. A grid is provided between the ash outlet 4c and the flange joint 4d. The grid intercepts lotus root char particles, allowing only carbonization dust and ash to be discharged through the ash discharge pipe 45, preventing the finished lotus root char from being lost with the ash and ensuring product yield. The flange joint 4d facilitates the disassembly, maintenance, and cleaning of the ash discharge pipe 45. In one embodiment of this application, a control valve is provided on the ash discharge pipe 45 to facilitate the control of the opening and closing of the ash discharge pipe 45.

[0054] See Figure 2 and Figure 5 In a preferred embodiment of this application, to address the problems of excessively high gas pressure and oxygen content inside the stir-frying cylinder 42 during the carbonization of lotus root sections, the stir-frying device 40 further includes a suction mechanism 80. The suction mechanism 80 includes a negative pressure pump 81 and a suction pipe 82. The negative pressure pump 81 is installed on the outer wall of the furnace body 41. One end of the suction pipe 82 is connected to the negative pressure pump 81, and the other end is connected to a connector 83. The connector 83 is connected to the discharge hopper 47, and an installation cavity 84 is provided inside the connector 83. A filter screen 85 is installed inside the installation cavity 84 on the air inlet side of the filter screen 85. A scraper 86 is slidably installed on the air inlet side of the filter screen 85 in the installation cavity 84. The scraper 86 can scrape away dust from the air inlet side of the filter screen 85. A drive rod is connected to the scraper 86, and the drive rod extends movably through the connector 83. A drive cylinder 87 is provided on the connector 83, and the drive cylinder 87 is connected to the drive rod. In the above embodiments, after the fresh lotus root sections are added and during the early stages of frying, the suction mechanism 80 can draw air from inside the frying drum 42, creating a slight negative pressure inside the frying drum 42. This reduces the oxygen content inside the frying drum 42, effectively reducing the chance of incomplete combustion of the fried lotus root charcoal and improving product yield. The filter screen 85 intercepts dust to prevent it from entering the negative pressure pump 81. During the later ash removal stage, the drive cylinder 87 can drive the scraper 86 to scrape off the dust on the surface of the filter screen 85. Combined with the blowing action of the blower pipe 72, the dust scraped off the surface of the filter screen 85 can be effectively sent into the furnace body 41 through the ash discharge pipe 45 for secondary combustion, which is both environmentally friendly and safe. At the same time, the ash is discharged without going through the outlet of the discharge hopper 47, avoiding the dust and lotus root charcoal sharing the same outlet, which can effectively ensure the cleanliness and quality of the lotus root charcoal. In this embodiment, for the sake of design simplicity, the suction pipe 82 can actually be used as part of the ash discharge pipe 45, that is, the inlet end of the suction pipe 82 is connected to the ash discharge pipe 45, and the suction pipe 82 and the ash discharge pipe 45 can be controlled by a valve body to open and close.

[0055] During the stir-frying process, the oxygen inside the stir-frying drum 42 reacts with the lotus root to form combustible gases, such as carbon monoxide formed from incomplete combustion. Directly releasing these combustible gases would be wasteful. Therefore, in an improved embodiment of this application, the outlet of the negative pressure pump 81 is connected to the ash discharge pipe 45 or directly to the furnace body 41. In reality, the oxygen inside the stir-frying drum 42 may be residual air or air entering the drum 42 through the gap between the feed hopper 46 and the stir-frying drum 42, or the gap between the stir-frying drum 42 and the discharge hopper 47. During operation, the negative pressure pump 81 creates a slight negative pressure inside the stir-frying drum 42 through the suction pipe 82, drawing the combustible fumes generated during carbonization into the furnace body 41 for secondary combustion, which is both environmentally friendly and safe. When the filter screen 85 becomes clogged with dust, the drive cylinder 87 drives the scraper 86 to reciprocate across the surface of the filter screen 85, automatically removing the accumulated dust and ensuring the unobstructed flow of the suction pipe.

[0056] See Figure 5 In one embodiment of this application, the spray charcoal extinguishing device 50 includes a housing 51, a spray pipe 52 disposed within the housing 51, and a water tank 53. The housing 51 is provided with a feed inlet 54, which is connected to the discharge end of the stirring drum 42. The water tank 53 is connected to the spray pipe 52 via a water supply pipe 55, which is equipped with a pump 56 for pressurizing water and spraying it through the spray pipe 52 to form a fine water mist that falls into the housing 51. To ensure that the lotus root charcoal can fully contact the water mist, a rotatable turning plate 57 is rotatably disposed within the housing 51, and a turning motor 58 is disposed on the housing 51 to drive the turning plate 57 to rotate. The rotation of the turning plate 57 continuously turns the accumulated lotus root charcoal, extinguishing any sparks inside and preventing reignition after discharge. The spray water volume can be precisely adjusted according to the temperature and output of the lotus root charcoal to avoid over-spraying and affecting subsequent drying efficiency. To facilitate the outward transport of the cooled lotus root charcoal inside box 51, a conveyor belt is installed at the bottom of box 51, with the discharge end of the conveyor belt connected to the inlet of the finished product drying box 60.

[0057] See Figure 7In one embodiment of this application, the hot air drying device 70 includes an air compressor 76, a filter 75, and a heat exchanger 73. The filter 75 is located at the air inlet of the air compressor 76 and is used to filter impurities in the air. The air outlet of the air compressor 76 is connected to the air inlet of the exhaust pipe 71. The heat exchanger 73 is located in the area between the air compressor 76 and the finished product drying chamber 60 on the exhaust pipe 71, and is connected to the exhaust port of the furnace body 41 for heat exchange. The high-temperature flue gas generated by combustion in the furnace body 41 flows through the heat exchanger 73 before being discharged, exchanging heat with the clean air in the exhaust pipe 71, thereby heating the air. The inlet end of the blowing pipe 72 is connected to the area between the air compressor 76 and the heat exchanger 73 on the exhaust pipe 71. In this embodiment, the blowing pipe 72 provides room temperature high-pressure air for purging the stirring drum 42; while the exhaust pipe 71, after passing through the heat exchanger 73, provides clean hot air for drying. Both the blowing pipe 72 and the exhaust pipe 71 are equipped with control valves 74. These control valves 74 independently control the on / off state and airflow of the exhaust pipe 71 and the blowing pipe 72. During pre-drying and finished product drying, the exhaust pipe 71 is opened and the blowing pipe 72 is closed. It should be noted that whether the stir-frying drum 42 uses a completely oxygen-deficient environment for stir-frying can be selected based on actual needs. If some air needs to be introduced during the stir-frying process to promote the carbonization reaction, the blowing pipe 72 can be opened to introduce air.

[0058] This invention also provides a method for producing lotus root charcoal, characterized by comprising the following steps:

[0059] Step S100: Remove the roots and impurities from the fresh lotus root nodes, and then clean them using the lotus root node cleaning device 10.

[0060] Step S200: Drain the fresh lotus root sections that have been cleaned by the draining lifting conveyor line 20 and the lotus root section cleaning device 10.

[0061] Step S300: Dry fresh lotus root sections via pre-drying conveyor line 30;

[0062] Step S400: Place the dried fresh lotus root sections into the stir-frying drum 42, close the feed hopper 46 and the discharge hopper 47, and drive the stir-frying drum 42 to rotate in the forward direction. The stir-frying temperature is 220-300℃ and the stir-frying time is 15-23 minutes to obtain lotus root section charcoal.

[0063] Step S500: After the stir-frying is completed, open the discharge hopper 47. The driver 44 drives the stir-frying drum 42 to rotate in the opposite direction, so that the stir-fried lotus root charcoal in the stir-frying drum 42 falls into the spray charcoal extinguishing device 50. After all the lotus root charcoal in the stir-frying drum 42 has fallen into the spray charcoal extinguishing device 50, close the discharge hopper 47 and open the air blower 72 and the ash discharge pipe 45 at the same time. Use the airflow discharged from the hot air drying device 70 to blow the inner wall of the stir-frying drum 42 and blow the fine charcoal particles remaining in the stir-frying drum 42 into the furnace body 41. Then close the air blower 72 and the ash discharge pipe 45. Open the feed hopper 46 to re-feed the material and repeat the above stir-frying operation.

[0064] Step S600: Spray water mist into the spray charcoal extinguishing device 50 to extinguish the sparks on the lotus root charcoal and cool the lotus root charcoal.

[0065] Step S700: The lotus root section charcoal discharged from the spray charcoal extinguishing device 50 is received by the finished product drying box 60 and dried with hot air to obtain the finished lotus root section charcoal.

[0066] In actual production, fresh lotus root sections after the roots are removed first enter the lotus root cleaning device 10 for cleaning. After cleaning, they are lifted by the draining and lifting conveyor line 20 to drain surface moisture, and then fall onto the mesh conveyor belt 32 of the pre-drying conveyor line 30. The lotus root sections are exposed to hot air from the warm air pipe 34 inside the heat preservation hood 33 and are turned over by the vibration of the cam 36, and their surface is initially dried. The pre-dried lotus root sections enter the feed hopper 46. After feeding is completed, the feed hopper 46 and the discharge hopper 47 are closed, and the furnace body 41 is ignited to heat the stir-frying drum 42. The driver 44 drives the stir-frying drum 42 to rotate slowly, and the internal turning guide plate 43 will gradually spread the lotus root sections evenly on the bottom of the stir-frying drum 42; the turning guide plate 43 continuously turns the lotus root sections in the stir-frying drum 42, so that they are heated evenly and undergo a carbonization reaction. The driver 44 can drive the stir-frying drum 42 to rotate in both directions at timed intervals, which can avoid local accumulation of lotus root sections and affect the quality of stir-frying.

[0067] In step S400, the entire stir-frying cylinder 42 functions like a closed oven, ensuring that the lotus root segments are heated from all directions. This accelerates the water loss of the lotus root segments and speeds up the reaction. The stir-frying temperature and duration are actually determined by the internal conditions of the stir-frying cylinder 42. If stir-frying is done under normal air conditions, the stir-frying time is longer and the temperature is relatively higher. This is because the air circulation during the stir-frying process carries some heat, extending the stir-frying time for the lotus root segments to become charred. Simultaneously, the presence of oxygen in the air ensures complete combustion in the early stages of the stir-frying process, while the charring reaction only occurs in the later stages under oxygen-deficient conditions. In a slightly negative pressure environment, heat dissipation from the inside of the stir-frying cylinder 42 is more difficult. This effectively maintains the internal temperature of the stir-frying cylinder 42, resulting in a relatively shorter stir-frying time and a relatively lower stir-frying temperature. The oxygen-deficient environment also facilitates a smoother charring reaction of the lotus root segments.

[0068] In addition, step S500 includes the following step: after the fresh lotus root sections are placed in, the suction mechanism 80 suctions the residual air inside the stir-frying cylinder 42. This operation creates a slightly negative pressure environment in the stir-frying cylinder 42, which can effectively reduce the internal oxygen content, prevent the lotus root charcoal from burning completely, and ensure the yield of lotus root charcoal.

[0069] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A lotus root section charcoal production line, characterized in that, include Lotus root cleaning device, used to clean lotus roots after the roots have been removed; The draining and lifting conveyor line is used to lift and drain the lotus roots that have been cleaned in the lotus root cleaning device. A pre-drying conveyor line is used to receive and dry the lotus root sections output from the draining and lifting conveyor line; The stir-frying device includes a furnace body and a stir-frying drum rotatably mounted inside the furnace body. A stirring guide plate is provided on the inner wall of the stir-frying drum. A driver is provided on the furnace body to drive the stir-frying drum to rotate. Both ends of the stir-frying drum are openable and closable. One end of the stir-frying drum can receive the lotus root charcoal output from the pre-drying conveyor line. The discharge end of the stir-frying drum is connected to the furnace body via an ash discharge pipe that can be opened and closed. A spray extinguishing device is used to receive the lotus root charcoal discharged from the stir-frying drum and spray it to extinguish any sparks on the lotus root charcoal. The finished product drying box is used to receive the lotus root charcoal discharged from the spray charcoal extinguishing device; The hot air drying device has its inlet end connected to the exhaust port of the furnace body for heat exchange. The hot air drying device supplies hot air to the finished product drying box and the pre-drying conveyor line through the exhaust pipe. The hot air drying device is connected to the feed end of the stir-frying drum through the blow pipe.

2. The lotus root charcoal production line according to claim 1, characterized in that: The furnace body is equipped with a feeding hopper adapted to one end of the stir-frying drum, and a discharging hopper adapted to the other end of the stir-frying drum. Both the feeding hopper and the discharging hopper can be opened and closed. Both the feeding hopper and the discharging hopper can rotate relative to the stir-frying drum. The feeding hopper is connected to the output end of the pre-drying conveyor line, and the discharging hopper is connected to the inlet end of the spray charcoal extinguishing device. The outlet end of the blower pipe is connected to the bottom of the feeding hopper, and the inlet end of the ash discharge pipe is connected to the side of the discharging hopper.

3. The lotus root charcoal production line according to claim 2, characterized in that: An external gear ring is provided on the outer wall of one end of the stir-frying cylinder, and a gear that meshes with the external gear ring is provided on the rotating end of the driver.

4. The lotus root charcoal production line according to claim 2, characterized in that: The outer walls at both ends of the stir-frying drum are provided with installation steps, and each installation step is provided with a fireproof limiting platform. Each of the two installation steps is installed through a mounting hole in the side wall of the furnace body via a bearing. The two fireproof limiting platforms are used to block the port of the corresponding mounting hole near the furnace body. The feed hopper and the discharge hopper are respectively fitted onto the ends of the two installation steps that protrude from the corresponding mounting holes. The inner walls of the corresponding ends of the feed hopper and the discharge hopper are provided with step portions that are adapted to the installation steps.

5. The lotus root charcoal production line according to claim 2, characterized in that: The discharge hopper is provided with an ash outlet at the end away from the stir-frying cylinder. A flange joint is provided on the ash outlet, and the flange joint is connected to the feed end of the inlet end of the ash discharge pipe. A grid is provided between the ash outlet and the flange joint.

6. The lotus root charcoal production line according to claim 2, characterized in that: The stir-frying device also includes a suction mechanism, which includes a negative pressure pump and a suction pipe. The negative pressure pump is installed on the outer wall of the furnace body. One end of the suction pipe is connected to the negative pressure pump, and the other end is connected to a connector. The connector is connected to the discharge hopper. The connector has an installation cavity, and a filter screen is installed in the installation cavity. A scraper is slidably installed on the air inlet side of the filter screen in the installation cavity. The scraper can scrape off the dust on the air inlet side of the filter screen. A drive rod is connected to the scraper. One end of the drive rod extends through the connector. A drive cylinder is installed on the connector and is connected to the drive rod.

7. The lotus root charcoal production line according to claim 1, characterized in that: The spray charcoal extinguishing device includes a housing, a spray pipe installed inside the housing, and a water tank. The housing is provided with a feed inlet, which is connected to the discharge end of the stirring drum. The water tank is connected to the spray pipe through a water supply pipe, and a pump is installed on the water supply pipe. A turning plate is rotatably installed inside the housing, and a turning motor is installed on the housing to drive the turning plate to rotate.

8. The lotus root charcoal production line according to claim 1, characterized in that: The pre-drying conveyor line includes a frame, a mesh conveyor belt that can be rotatably mounted on the frame, and a heat-insulating cover that covers the mesh conveyor belt. One end of the mesh conveyor belt can receive the fresh lotus root sections discharged from the draining and lifting conveyor line, and the other end of the mesh conveyor belt is connected to the feed end of the stir-frying drum. A warm air duct is arranged inside the heat insulation cover. Several nozzles are installed on the warm air duct, and the outlets of the nozzles all point to the mesh conveyor belt. The warm air duct is connected to the exhaust duct. At least one support roller is installed on the frame. A cam is installed on the support roller. The outer periphery of the cam abuts against the back of the mesh conveyor belt. A vibrating motor for driving the support roller to rotate is installed on the frame.

9. A lotus root charcoal production line according to claim 1, characterized in that: The hot air drying device includes an air compressor, a filter, and a heat exchanger. The filter is located at the air inlet of the air compressor, and the air outlet of the air compressor is connected to the air inlet of the exhaust pipe. The heat exchanger is located in the area between the air compressor and the finished product drying chamber, and is connected to the exhaust port of the furnace body for heat exchange. The inlet of the blowing pipe is connected to the area between the air compressor and the heat exchanger of the exhaust pipe. Both the blowing pipe and the exhaust pipe are equipped with control valves.

10. A method for producing lotus root charcoal, characterized in that, Includes the following steps: Step S100: Remove the roots and impurities from the fresh lotus root nodes, and then clean them using a lotus root node cleaning device. Step S200: Fresh lotus root sections that have been cleaned by the draining and lifting conveyor line and the draining and washing device. Step S300: Dry fresh lotus root sections via a pre-drying conveyor line; Step S400: Place the dried fresh lotus root sections into the stir-frying drum, close the feed hopper and discharge hopper, and drive the stir-frying drum to rotate in the forward direction. The stir-frying temperature is 220-300℃ and the stir-frying time is 15-23 minutes to obtain lotus root section charcoal. Step S500: After the stir-frying is completed, open the discharge hopper, and the driver drives the stir-frying drum to rotate in the opposite direction, so that the stir-fried lotus root charcoal falls into the spray charcoal extinguishing device; after all the lotus root charcoal in the stir-frying drum has fallen into the spray charcoal extinguishing device, close the discharge hopper and open the blower pipe and ash discharge pipe at the same time, use the airflow discharged from the hot air drying device to blow the inner wall of the stir-frying drum, and blow the fine charcoal particles remaining in the stir-frying drum into the furnace body, and then close the blower pipe and ash discharge pipe; open the feed hopper to re-feed, and repeat the above stir-frying operation; Step S600: Spray water mist into the charcoal spraying device to extinguish the sparks on the lotus root charcoal and cool the lotus root charcoal. Step S700: The lotus root section charcoal discharged from the spray charcoal extinguishing device is received by the finished product drying box and dried with hot air to obtain the finished lotus root section charcoal.

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