Steam heating device of thin plate type cut-tobacco dryer and leak detection method

Abstract

The invention belongs to the technical field of cut tobacco drying equipment, and discloses a steam heating device of a sheet type cut tobacco dryer and a leak hunting method.The steam heating device of the sheet type cut tobacco dryer comprises a rack, a cut tobacco drying cylinder, a shoveling plate, a heating assembly and a leak hunting assembly, the cut tobacco drying cylinder is rotationally arranged on the rack, the shoveling plate is arranged on the inner wall of the cut tobacco drying cylinder and used for turning cut tobacco in the cut tobacco drying cylinder, and the leak hunting assembly is arranged on the rack; the steam pipeline and the recovery pipeline are both arranged on the rack, the heating pipe is of a snakelike structure and is arranged on the shoveling plate, high-temperature steam enters the heating pipe through the steam pipeline, the heating pipe heats high-humidity tobacco shreds, moisture of the tobacco shreds is rapidly evaporated, the tobacco shreds are dried, the first stop valve is connected to the steam pipeline, and the second stop valve is connected to the recovery pipeline. The pressure gauge is connected to the second stop valve, the third stop valve is connected to the pressure gauge, water is supplied to the steam pipeline to add pigments, leakage points show that local parts of the pipeline are obviously colored spots, the positions of the leakage points of the pipeline are determined, and therefore it is guaranteed that the water content of processed tobacco shreds meets the quality requirement.

Description

Technical Field

[0001] This invention relates to the field of tobacco drying equipment technology, and in particular to a steam heating device and leak detection method for a thin-plate drying machine. Background Technology

[0002] Currently, drying tobacco shreds is an essential step in cigarette processing, and its effectiveness directly impacts the sensory quality of cigarettes. Therefore, it is crucial to dry the tobacco shreds to ensure their moisture content meets standards. Most tobacco drying processes utilize drum drying technology, achieving drying through two methods: slow heat conduction between the drum wall and the tobacco shreds, and convective heat transfer between the tobacco shreds and the hot air within the drum. However, the slow heat conduction between the drum wall and the tobacco shreds results in a slow drying rate.

[0003] Existing tobacco drying equipment often includes lifting plates to turn the tobacco. These plates are flat and evenly distributed circumferentially on the inner side of the drum. The drawback of this equipment is that, because the lifting plates are flat, they cannot carry the tobacco to the highest point during drum rotation. When a lifting plate rotates from a low position to a downward angle, the tobacco on it quickly slips off. Therefore, the utilization rate of the drum's interior is only about one-third, resulting in low drying efficiency.

[0004] During use, the lifting plate must withstand the pressure of heating steam, repeated thermal expansion and contraction, and friction from contact with tobacco. There is a risk of pinholes appearing in the steam heating pipes, which can cause steam or condensate leakage. This will result in wet clumps of tobacco after drying, yellow spots, and ultimately, the moisture content of the processed tobacco will not meet the quality requirements.

[0005] Therefore, there is an urgent need for a steam heating device and leak detection method for a thin-plate wire drying machine to solve the above problems. Summary of the Invention

[0006] According to one aspect of the present invention, the thin-plate type steam heating device for drying tobacco shreds rapidly evaporates moisture, thereby achieving tobacco drying. Furthermore, it identifies the location of leaks in the pipeline to ensure that the moisture content of the processed tobacco shreds meets quality requirements.

[0007] To address the aforementioned problems in the existing technology, the present invention adopts the following technical solution:

[0008] The steam heating device for a thin-plate filament drying machine includes:

[0009] frame;

[0010] The wire drying cylinder is rotatably mounted on the frame;

[0011] A lifting plate is disposed on the inner wall of the drying cylinder, and the lifting plate is used to turn the tobacco inside the drying cylinder;

[0012] The heating assembly includes a steam pipe, a recovery pipe, and a heating pipe. The steam pipe and the recovery pipe are both mounted on the frame. The heating pipe has a serpentine structure and is mounted on the lifting plate. The steam pipe is connected to the inlet of the heating pipe, and the recovery pipe is connected to the outlet of the heating pipe.

[0013] The leak detection assembly includes a first shut-off valve, a second shut-off valve, a third shut-off valve, and a pressure gauge. The first shut-off valve is connected to the steam pipeline and is used to introduce pigment water. The second shut-off valve is connected to the recovery pipeline. The pressure gauge is connected to the second shut-off valve, and the third shut-off valve is connected to the pressure gauge.

[0014] Preferably, the lifting plate includes a first lifting plate unit and a second lifting plate unit. The first lifting plate unit is attached to the inner wall of the tobacco drying cylinder, and the second lifting plate unit is set at an acute angle to the first lifting plate unit. The second lifting plate unit is used to turn the tobacco.

[0015] Preferably, the heating tube includes a first heating part and a second heating part, the first heating part being disposed in the first plate-lifting unit and the second heating part being disposed in the second plate-lifting unit.

[0016] Preferably, there are multiple lifting plates, which are arranged at intervals along the circumference of the wire drying cylinder.

[0017] Preferably, the steam heating device of the thin-plate filament drying machine further includes a rotary joint, which includes a fixed part and a rotating part. The fixed part is sleeved on the rotating part and is fixedly mounted on the frame. The fixed part has a steam inlet and a condensate outlet. The steam inlet is connected to the steam pipeline, and the condensate outlet is connected to the recovery pipeline. The rotating part is rotatably mounted on the frame and has a steam chamber and a condensate chamber. The steam chamber is connected to the steam inlet and the inlet of the heating pipe, and the condensate chamber is connected to the condensate outlet and the outlet of the heating pipe.

[0018] Preferably, the tobacco drying cylinder has a tobacco inlet and a tobacco outlet, and along the vertical height direction of the frame, the height of the tobacco inlet from the ground is higher than the height of the tobacco outlet from the ground.

[0019] Preferably, the wall thickness of the heating tube is 1.5 mm.

[0020] According to another aspect of the present invention, a leak detection method for a steam heating device of a thin-plate filament drying machine is provided, characterized in that, through the implementation of the above-described thin-plate filament drying machine steam heating device, the leak detection method for the thin-plate filament drying machine steam heating device includes:

[0021] S100: Open the first shut-off valve, the second shut-off valve and the third shut-off valve to supply water to the steam pipeline;

[0022] S200: Close the third shut-off valve, observe the pressure value of the pressure gauge until the pressure value of the pressure gauge equals the water supply pressure, close the first shut-off valve and the second shut-off valve, open the second shut-off valve at regular intervals, and when the pressure value of the pressure gauge decreases, it is determined that there is a leak.

[0023] S300: Add pigment to the water supplied to the steam pipeline; the leakage point will be manifested as obvious colored spots in the local area of ​​the pipeline.

[0024] Preferably, the leak detection method for the steam heating device of the thin-plate wire drying machine further includes the following steps after S200:

[0025] S210: After holding the pressure for a certain period of time, check whether there is water seepage inside the wire drying cylinder. If there is water seepage, it is determined that there is a leak.

[0026] S220: After holding the pressure for a certain period of time, observe whether there are water stains at the tobacco outlet of the drying cylinder. If there are water stains, it is determined that there is a leak.

[0027] Preferably, the leak detection method for the steam heating device of the thin-plate wire drying machine further includes:

[0028] S400: Open the first shut-off valve, the second shut-off valve and the third shut-off valve, and fill the recovery pipeline with compressed air to drain the accumulated water. Rotate the wire drying drum and fill it with compressed air again. Repeat this process until the accumulated water is drained.

[0029] The beneficial effects of this invention are as follows:

[0030] The thin-plate type steam heating device for tobacco drying machine provided by this invention uses a drying drum to tumble the tobacco shreds, and a lifting plate continuously lifts and drops the tobacco shreds. Simultaneously, high-temperature steam enters the heating tube through a steam pipeline. During the flow of the high-temperature steam within the heating tube, the high-temperature heating tube heats the highly moist tobacco shreds, causing the moisture in the tobacco shreds to evaporate rapidly, thus drying the tobacco shreds. The steam after heat exchange condenses into condensate and is discharged through a recovery pipeline. The first, second, and third shut-off valves are opened to supply water to the steam pipeline. The third shut-off valve is closed, and the pressure gauge value is observed until the pressure gauge value equals the water supply pressure. The first and second shut-off valves are then closed. The second shut-off valve is opened at regular intervals. When the pressure gauge value decreases, a leak is identified. Pigment is added to the water supplied to the steam pipeline. A leak is indicated by a noticeable colored spot on a localized part of the pipeline. The location of the leak is determined, and repairs are made to ensure that the moisture content of the processed tobacco shreds meets quality requirements.

[0031] The leak detection method for the steam heating device of the thin-plate tobacco drying machine provided by this invention involves opening the first, second, and third shut-off valves to supply water to the steam pipeline; closing the third shut-off valve and observing the pressure value on the pressure gauge until it equals the water supply pressure; then closing the first and second shut-off valves; and opening the second shut-off valve at regular intervals. A decrease in the pressure value on the pressure gauge indicates a leak. Adding pigment to the water supplied to the steam pipeline results in a visible colored spot on the pipeline at the leak point. The location of the leak is then determined, and repairs are made to ensure that the moisture content of the processed tobacco meets quality requirements. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the steam heating device for a thin-plate wire drying machine provided in Embodiment 1 of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the thin-plate wire drying machine steam heating device (excluding leak detection components) provided in Embodiment 1 of the present invention;

[0034] Figure 3 This is a schematic diagram of the internal structure of the wire drying cylinder provided in Embodiment 1 of the present invention;

[0035] Figure 4 This is a front view of the interior of the wire drying cylinder provided in Embodiment 1 of the present invention;

[0036] Figure 5 This is a flowchart of a leak detection method for a steam heating device for a thin-plate wire drying machine provided in Embodiment 2 of the present invention.

[0037] Figure label:

[0038] 1. Rack;

[0039] 2. Tobacco drying cylinder; 21. Tobacco inlet; 22. Tobacco outlet;

[0040] 3. Copying; 31. First copying unit; 32. Second copying unit;

[0041] 41. Steam pipeline; 42. Recovery pipeline; 43. Heating pipe;

[0042] 5. Leak detection assembly; 51. First shut-off valve; 52. Second shut-off valve; 53. Third shut-off valve; 54. Pressure gauge;

[0043] 6. Rotary joint. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0048] Example 1

[0049] like Figures 1-4As shown, in this embodiment, the steam heating device of the thin-plate tobacco drying machine includes a frame 1, a drying cylinder 2, a lifting plate 3, a heating assembly, and a leak detection assembly 5. The drying cylinder 2 is rotatably mounted on the frame 1, and the lifting plate 3 is disposed on the inner wall of the drying cylinder 2, used to agitate the tobacco shreds inside the drying cylinder 2. The heating assembly includes a steam pipe 41, a recovery pipe 42, and a heating pipe 43. Both the steam pipe 41 and the recovery pipe 42 are mounted on the frame 1. The heating pipe 43 has a serpentine structure and is disposed on the lifting plate 3. The steam pipe 41 connects to the inlet of the heating pipe 43, and the recovery pipe 42 connects to the outlet of the heating pipe 43. The leak detection assembly 5 includes a first shut-off valve 51, a second shut-off valve 52, a third shut-off valve 53, and a pressure gauge 54. The first shut-off valve 51 is connected to the steam pipeline 41 and is used to introduce pigment water. The second shut-off valve 52 is connected to the recovery pipeline 42. The pressure gauge 54 is connected to the second shut-off valve 52, and the third shut-off valve 53 is connected to the pressure gauge 54.

[0050] The drying cylinder 2 is suspended above the ground via the frame 1, and is rotatably connected to the frame 1 via bearings. The motor is mounted on the frame 1 as the rotation drive source for the drying cylinder 2, and the output end of the motor is connected to the drying cylinder 2. Under the drive of the motor, the drying cylinder 2 can rotate relative to the frame 1, causing the tobacco inside the drying cylinder 2 to tumble.

[0051] The lifting plate 3 is fixed to the inner wall of the drying cylinder 2 by welding, gluing, bolting, etc. The lifting plate 3 can be any shape such as L-shaped, Z-shaped, S-shaped, etc., and can continuously lift and drop the tumbling tobacco in the drying cylinder 2. Heating tubes 43 are distributed on the surface of the lifting plate 3. In actual use, in order to increase heat exchange efficiency, the wall thickness of the heating tubes 43 is 1.5mm. The heating tubes 43 are arranged in multiple U-shaped series in a serpentine structure for heating and drying the tobacco in the drying cylinder 2. The heating area is large and the drying is thorough. The steam pipe 41 and the recovery pipe 42 are both installed on the frame 1. The air inlet of the steam pipe 41 is connected to the steam source, the air outlet of the steam pipe 41 is connected to the inlet of the heating tube 43, and the outlet of the heating tube 43 is connected to the water inlet of the recovery pipe 42. High-temperature steam enters the heating tube 43 through steam pipe 41. As the high-temperature steam flows within the heating tube 43, it heats the highly moist tobacco shreds, causing the moisture to evaporate rapidly. The drying drum 2 rotates continuously, and the lifting plates 3 continuously lift and drop the tobacco shreds, thus drying them. Simultaneously, the steam after heat exchange condenses into condensate and is discharged through the recovery pipe 42.

[0052] The input end of the first shut-off valve 51 is connected to the water supply port, the output end of the first shut-off valve 51 is connected to the steam pipeline 41, the input end of the second shut-off valve 52 is connected to the recovery pipeline 42, the output end of the second shut-off valve 52 is connected to the input end of the pressure gauge 54, the output end of the pressure gauge 54 is connected to the input end of the third shut-off valve 53, and the output end of the third shut-off valve 53 is connected to the drain port.

[0053] During the water filling stage, open the first shut-off valve 51, the second shut-off valve 52, and the third shut-off valve 53 to supply water from the outside to the water inlet. The water flow path is: water inlet - first shut-off valve 51 - steam pipe 41 - heating pipe 43 - recovery pipe 42 - second shut-off valve 52 - pressure gauge 54 - third shut-off valve 53 - drain outlet. It should be noted that the water pressure should not be too high, preferably less than or equal to 0.3 MPa, to avoid damage to the heating pipe 43 due to excessive pressure. Furthermore, the water flow rate should remain stable, the water supply duration should be no less than 45 minutes, and the water supply process should not be interrupted to ensure sufficient filling of the pipeline and avoid leakage detection errors caused by water supply interruption. The completion of water supply is judged by whether no air bubbles drain from the drain outlet for 5 minutes. During the leak detection process, ensure that the entire pipeline of the wire drying machine is in a cooled state to prevent damage caused by sudden contraction of the pipeline due to water supply.

[0054] After the water filling stage is completed, the pressure holding stage begins. The third shut-off valve 53 is closed, and the pressure value on the pressure gauge 54 is observed until it equals the water supply pressure. Then, the first shut-off valve 51 and the second shut-off valve 52 are closed, and the pressure is maintained for 12 hours. It should be noted that the second shut-off valve 52 is opened every 2 hours, and the pressure value on the pressure gauge 54 is recorded. If the pressure value on the pressure gauge 54 does not decrease, there is no leakage. If the pressure value on the pressure gauge 54 decreases, there is a leak in the pipeline. After maintaining the pressure for 6 hours, check the inside of the drying cylinder 2 for water seepage and the tobacco outlet 22 for water stains. If water seepage or water stains are found, there is a leak in the pipeline, requiring repair. The testing method involves supplying water to the steam pipeline 41, with food-grade pigments or fluorescent pigments added to the water. Leaks will appear as localized, obvious discoloration or fluorescent effects. The location of the leak is then determined, and repairs are made to ensure the processed tobacco's moisture content meets quality requirements.

[0055] Finally, the drainage stage begins. First shut-off valve 51, second shut-off valve 52, and third shut-off valve 53 are opened until no water flows from either the water supply or drain outlet. Compressed air is then introduced into the recovery pipe 42 through the drain outlet to drain the accumulated water. The compressed air is then stopped, and the drying drum 2 is rotated at a certain angle. Compressed air is then introduced again, and this process is repeated until all water is drained, ending the drainage stage. It should be noted that the pressure of the compressed air should not be too high, ideally between 0.3 and 0.35 MPa, to avoid damaging the heating element 43. After the drainage process is complete, the drying drum 2 is started and then randomly stopped. If the drying drum 2 rotates after stopping, the drainage is insufficient, and the process must be repeated. Throughout the drainage process, the rotation direction of the drying drum 2 should remain consistent to avoid interfering with the drainage process. After completing the drainage process, the leak detection component 5 is removed, and the steam heating device of the thin-plate drying machine is restored for future use.

[0056] Furthermore, referring to Figures 3-4 The lifting plate 3 includes a first lifting plate unit 31 and a second lifting plate unit 32. The first lifting plate unit 31 is attached to the inner wall of the drying cylinder 2, and the second lifting plate unit 32 is set at an acute angle to the first lifting plate unit 31 and is used to turn the tobacco. The heating tube 43 includes a first heating part and a second heating part. The first heating part is disposed on the first lifting plate unit 31, and the second heating part is disposed on the second lifting plate unit 32.

[0057] The first lifting plate unit 31 has an arc-shaped structure, which can completely fit the inner wall of the drying cylinder 2. That is, the structural shape of the first lifting plate unit 31 matches the cylindrical shape of the inner wall of the drying cylinder 2. The second lifting plate unit 32 is configured with an acute angle between it and the first lifting plate unit 31. It is used to lift the tobacco shreds tumbling inside the drying cylinder 2. At the same time, the first heating part on the first lifting plate unit 31 and the second heating part on the second lifting plate unit 32 can fully heat the tobacco shreds to achieve thorough drying and good drying effect. It should be noted that both the first heating part and the second heating part have steam inlets and condensate outlets. The steam inlets of both the first heating part and the second heating part are connected to the steam pipe 41. The high-temperature steam from the steam pipe 41 enters both the first heating part and the second heating part for continuous heating. The condensate outlets of both the first heating part and the second heating part are connected to the recovery pipe 42. The steam after heat exchange is condensed into condensate and discharged through the recovery pipe 42.

[0058] Furthermore, referring to Figures 1-4 There are multiple lifting plates 3, which are arranged at intervals along the circumference of the drying cylinder 2.

[0059] In this embodiment, there are eight lifting plates 3. Along the circumference of the drying cylinder 2, the second lifting plate units 32 of the eight lifting plates 3 are all bent in the same direction, without dead angles, allowing for multi-angle stirring and heating drying. During the rotation of the drying cylinder 2, the second lifting plate units 32 of the eight lifting plates 3 can fully lift and drop the tumbling tobacco, causing the tobacco to be dispersed, making it easier for the tobacco to fully contact the heating tubes 43 on the lifting plates 3 for heating and drying.

[0060] Furthermore, referring to Figures 1-4 The steam heating device of the thin plate filament drying machine also includes a rotary joint 6, which includes a fixed part and a rotating part. The fixed part is sleeved on the rotating part and is fixedly mounted on the frame 1. The fixed part has a steam inlet and a condensate outlet. The steam inlet is connected to the steam pipeline 41, and the condensate outlet is connected to the recovery pipeline 42. The rotating part is rotatably mounted on the frame 1 and has a steam chamber and a condensate chamber. The steam chamber is connected to the steam inlet and the inlet of the heating pipe 43, and the condensate chamber is connected to the condensate outlet and the outlet of the heating pipe 43.

[0061] High-temperature steam enters the fixed section sequentially through steam pipe 41 and steam inlet. The fixed section is stationary relative to the frame 1. Steam pipe 41 becomes tangled and knotted during the rotation of the drying drum 2, while the rotating section rotates synchronously with the drying drum 2. High-temperature steam enters the steam chamber of the rotating section from the fixed section, and then enters the heating tube 43 through the inlet of the heating tube 43, facilitating the drying and heating of the tobacco by the heating tube 43. The steam after heat exchange condenses into condensate, which collects from the outlet of the heating tube 43 into the condensation chamber, then enters the fixed section through the condensate outlet, and finally exits through the fixed section into the recovery pipe 42. Under the action of the rotary joint 6, the recovery pipe 42 and steam pipe 41 are unaffected and avoid tangling while the drying drum 2 rotates. At the same time, the rotary joint 6 serves to combine and divide the flow.

[0062] Furthermore, referring to Figures 1-4 The drying cylinder 2 has a tobacco inlet 21 and a tobacco outlet 22. Along the vertical height direction of the frame 1, the height of the tobacco inlet 21 above the ground is higher than the height of the tobacco outlet 22 above the ground.

[0063] High-moisture tobacco shreds are added into the drying drum 2 through the tobacco inlet 21. As the drum 2 rotates, the tobacco shreds are continuously turned over. Simultaneously, the lifting plates 3 repeatedly lift and drop the tobacco shreds. The high-temperature heating tubes 43 heat the tobacco shreds, causing the moisture to evaporate rapidly, thus drying the tobacco shreds. Due to the height difference, the tobacco shreds fall freely to the tobacco outlet 22, through which the dried tobacco shreds are removed.

[0064] Example 2

[0065] like Figure 5As shown, in this embodiment, through the implementation of the above-described thin-plate filament drying machine steam heating device, a leak detection method for the thin-plate filament drying machine steam heating device includes the following steps:

[0066] S100: Open the first shut-off valve 51, the second shut-off valve 52 and the third shut-off valve 53 to supply water to the steam pipeline 41.

[0067] Water is supplied from the outside to the water inlet. The water flow path is as follows: water inlet - first shut-off valve 51 - steam pipe 41 - heating pipe 43 - recovery pipe 42 - second shut-off valve 52 - pressure gauge 54 - third shut-off valve 53 - drain outlet. The water pressure should not be too high, preferably less than or equal to 0.3 MPa, to avoid damage to the heating pipe 43. Furthermore, the water flow rate should remain stable, the water supply duration should be no less than 45 minutes, and the water supply process should not be interrupted to ensure sufficient filling of the pipeline and avoid leakage detection errors caused by water supply interruption. The completion of water supply is judged by whether no air bubbles are discharged from the drain outlet for 5 minutes. During the leak detection process, it should be ensured that the entire pipeline of the wire drying machine is in a cooled state to prevent damage caused by sudden contraction of the pipeline due to water supply. The highest point of the drainage pipe should be perpendicular to the ground at a distance greater than the maximum distance between the highest point of all components and pipes in the entire device and the vertical ground. This ensures complete filling of the steam heating device of the wire drying machine, preventing trapped air and avoiding errors in leak detection results. Once all the above conditions are met, the pressure holding stage can begin.

[0068] S200: Close the third shut-off valve 53, observe the pressure value of the pressure gauge 54 until the pressure value of the pressure gauge 54 equals the water supply pressure, close the first shut-off valve 51 and the second shut-off valve 52, open the second shut-off valve 52 at regular intervals, and when the pressure value of the pressure gauge 54 decreases, it is determined that there is a leak.

[0069] After the water filling stage is completed, the pressure holding stage begins. The third shut-off valve 53 is closed, and the pressure value on pressure gauge 54 is observed until it equals the water supply pressure. Then, the first shut-off valve 51 and the second shut-off valve 52 are closed, and the pressure is maintained for 12 hours. During this period, the second shut-off valve 52 is opened every 2 hours, and the pressure value on pressure gauge 54 is recorded. If the pressure value on pressure gauge 54 does not decrease, there is no leakage. If the pressure value on pressure gauge 54 decreases, there is a leak in the pipeline. After maintaining the pressure for 6 hours, check the inside of the drying cylinder 2 for water seepage and observe the tobacco outlet 22 for water stains. If all the above conditions during the pressure holding stage are met, the pipeline system of the steam heating device of the drying machine is considered intact and leak-free. If any of the conditions during the pressure holding stage are not met, there is a leak in the pipeline system of the steam heating device of the drying machine, and the leak needs to be investigated and repaired.

[0070] S300: Adding pigment to the water supplied to steam pipe 41 will cause leaks to manifest as obvious colored spots in the local area of ​​the pipe.

[0071] Water is supplied to steam pipe 41. Food-grade pigments or fluorescent pigments are added to the water. Leaks will appear as localized obvious color spots or fluorescent effects. The location of the leak in the pipe is finally determined, and it is repaired and patched to ensure that the moisture content of the processed tobacco meets the quality requirements.

[0072] S400: Open the first shut-off valve 51, the second shut-off valve 52 and the third shut-off valve 53, and fill the recovery pipeline 42 with compressed air to drain the water. Rotate the drying drum 2 and fill it with compressed air again. Repeat this process until the water is drained.

[0073] During the drainage stage, open the first shut-off valve 51, the second shut-off valve 52, and the third shut-off valve 53 until no water is drained from either the water supply or drain outlet. Then, pressurize the recovery pipe 42 through the drain outlet to empty the accumulated water in the pipe. Stop pressing the compressed air, rotate the drying drum 2 at a certain angle, and continue pressing the compressed air, repeating the above operation until all the water is drained, thus ending the drainage stage. It should be noted that the pressure of the pressurized compressed air should not be too high, ideally between 0.3 and 0.35 MPa, to avoid damaging the heating tube 43 due to excessive pressure. After the drainage process is completed, start the drying drum 2 and then stop it randomly. If the drying drum 2 rotates after stopping, the drainage is insufficient, and the drainage process must be repeated. During the drainage process, the rotation direction of the drying drum 2 should remain consistent to avoid interfering with the drainage process. After completing the drainage process, remove the leak detection component 5 and restore the steam heating device of the thin-plate drying machine for subsequent use.

[0074] The leak detection method for the steam heating device of the thin-plate tobacco drying machine provided in this embodiment involves opening the first shut-off valve 51, the second shut-off valve 52, and the third shut-off valve 53 to supply water to the steam pipeline 41; closing the third shut-off valve 53 and observing the pressure value of the pressure gauge 54 until the pressure value of the pressure gauge 54 equals the water supply pressure; then closing the first shut-off valve 51 and the second shut-off valve 52; and opening the second shut-off valve 52 at regular intervals. When the pressure value of the pressure gauge 54 decreases, a leak is identified. Pigment is added to the water supplied to the steam pipeline 41; a leak will manifest as a noticeable colored spot on a localized part of the pipeline. The location of the leak is determined, and repairs are made to ensure that the moisture content of the processed tobacco meets quality requirements.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A steam heating device for a thin-plate filament drying machine, characterized in that, include: Rack (1); The wire drying cylinder (2) is rotatably mounted on the frame (1); A lifting plate (3) is disposed on the inner wall of the drying cylinder (2), and the lifting plate (3) is used to turn the tobacco inside the drying cylinder (2); The heating assembly includes a steam pipe (41), a recovery pipe (42), and a heating pipe (43). The steam pipe (41) and the recovery pipe (42) are both mounted on the frame (1). The heating pipe (43) has a serpentine structure and is mounted on the lifting plate (3). The steam pipe (41) is connected to the inlet of the heating pipe (43), and the recovery pipe (42) is connected to the outlet of the heating pipe (43). The leak detection assembly (5) includes a first shut-off valve (51), a second shut-off valve (52), a third shut-off valve (53), and a pressure gauge (54). The first shut-off valve (51) is connected to the steam pipeline (41) and is used to introduce pigment water. The second shut-off valve (52) is connected to the recovery pipeline (42). The pressure gauge (54) is connected to the second shut-off valve (52). The third shut-off valve (53) is connected to the pressure gauge (54).

2. The steam heating device for a thin-plate filament drying machine according to claim 1, characterized in that, The lifting plate (3) includes a first lifting plate unit (31) and a second lifting plate unit (32). The first lifting plate unit (31) is attached to the inner wall of the drying cylinder (2). The second lifting plate unit (32) is set at an acute angle to the first lifting plate unit (31), and the second lifting plate unit (32) is used to turn the tobacco.

3. The steam heating device for a thin-plate filament drying machine according to claim 2, characterized in that, The heating tube (43) includes a first heating part and a second heating part, the first heating part is disposed in the first plate-lifting unit (31), and the second heating part is disposed in the second plate-lifting unit (32).

4. The steam heating device for a thin-plate filament drying machine according to claim 1, characterized in that, There are multiple lifting plates (3), which are spaced apart along the circumference of the wire drying cylinder (2).

5. The steam heating device for a thin-plate filament drying machine according to claim 1, characterized in that, The steam heating device of the thin plate filament drying machine also includes a rotary joint (6), which includes a fixed part and a rotating part. The fixed part is sleeved on the rotating part and is fixedly installed on the frame (1). The fixed part has a steam inlet and a condensate outlet. The steam inlet is connected to the steam pipeline (41), and the condensate outlet is connected to the recovery pipeline (42). The rotating part is rotatably installed on the frame (1). The rotating part has a steam chamber and a condensate chamber. The steam chamber is connected to the steam inlet and the inlet of the heating pipe (43), and the condensate chamber is connected to the condensate outlet and the outlet of the heating pipe (43).

6. The steam heating device for a thin-plate filament drying machine according to claim 1, characterized in that, The drying cylinder (2) has a tobacco inlet (21) and a tobacco outlet (22). Along the vertical height direction of the frame (1), the height of the tobacco inlet (21) above the ground is higher than the height of the tobacco outlet (22) above the ground.

7. The steam heating device for a thin-plate filament drying machine according to claim 1, characterized in that, The wall thickness of the heating tube (43) is 1.5 mm.

8. A leak detection method for the steam heating device of a thin-plate wire drying machine, characterized in that, By implementing the steam heating device for the thin-plate wire drying machine as described in any one of claims 1-7, the leak detection method of the steam heating device for the thin-plate wire drying machine includes: S100: Open the first shut-off valve (51), the second shut-off valve (52) and the third shut-off valve (53) to supply water to the steam pipeline (41); S200: Close the third shut-off valve (53), observe the pressure value of the pressure gauge (54) until the pressure value of the pressure gauge (54) is equal to the water supply pressure, close the first shut-off valve (51) and the second shut-off valve (52), open the second shut-off valve (52) at certain intervals, and when the pressure value of the pressure gauge (54) decreases, it is determined that there is a leak. S300: Add pigment to the water supplied to the steam pipeline (41), and the leakage point will be manifested as obvious colored spots in the local area of ​​the pipeline.

9. The leak detection method for the steam heating device of the thin-plate wire drying machine according to claim 8, characterized in that, The leak detection method for the steam heating device of the thin-plate wire drying machine also includes the following steps after S200: S210: After holding the pressure for a certain period of time, check whether there is water seepage inside the drying cylinder (2). If there is water seepage, it is determined that there is a leak. S220: After holding the pressure for a certain period of time, observe whether there are water stains at the tobacco outlet (22) of the drying drum (2). If there are water stains, it is determined that there is a leak.

10. The leak detection method for the steam heating device of the thin-plate wire drying machine according to claim 8, characterized in that, The leak detection method for the steam heating device of the thin-plate filament drying machine also includes: S400: Open the first shut-off valve (51), the second shut-off valve (52) and the third shut-off valve (53), and fill the recovery pipeline (42) with compressed air to drain the water. Rotate the drying drum (2) and fill with compressed air again. Repeat this process until the water is drained.

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