A cracking furnace with a heating structure

Abstract

The invention provides a cracking furnace with a heating structure, belonging to the technical field of cracking furnaces. The cracking furnace with a heating structure comprises a smoke exhaust device and a furnace body. The smoke exhaust device is installed on the top of the furnace body and is used to filter the smoke generated by the cracking furnace. It also comprises an air suction component used to suck air into the smoke exhaust device. The smoke exhaust device comprises a box body, a filter component, a push block and a plurality of bidirectional screws which are fixedly connected end to end and rotatably installed on the tops of both sides of the inner wall of the box body. There are a plurality of filter components which are evenly distributed inside the box body along the axial direction of the bidirectional screws. The top ends of the plurality of filter components are respectively sleeved on the middle parts of the outer walls of the plurality of bidirectional screws. The push block is slidably installed on the inner bottom wall of the box body along the axial direction of the bidirectional screws, so that the same section of reverse airflow needs to pass through multiple filter screens, resulting in the wind speed and wind force of the airflow being gradually reduced, thereby improving the reverse blowing dust removal effect of the filter screen.

Description

Technical Field

[0001] The invention belongs to the technical field of cracking furnaces, and in particular relates to a cracking furnace with a heating structure. Background Art

[0002] The cracking furnace is a crucial equipment in petrochemical production, mainly used for the cracking reaction of hydrocarbon compounds. The cracking reaction is a complex chemical process that needs to be carried out under the action of high temperature and catalyst. Therefore, the cracking furnace needs to be heated when it is working. During the heating process, a large amount of flue gas will be generated during the combustion of fuel. After the flue gas is discharged from the cracking furnace, solid particles such as smoke and dust in the flue gas need to be captured and removed.

[0003] A Chinese patent with authorization announcement number CN117046235B discloses a hot flue gas treatment device for an industrial furnace, including a coolant circulation pipe, a hydraulic drive mechanism, a cleaning transmission mechanism, a flue gas filtering mechanism, a filtering transmission mechanism and a cleaning control mechanism; the coolant circulation pipe is used to transport cooling water; the hydraulic drive mechanism includes a hydraulic fan installed on the inner side of the coolant circulation pipe; the flue gas filtering mechanism includes an air guide plate, and a sealing plate and a cleaning plate are provided on the upper side of the air guide plate. This device uses the circulating water in the coolant circulation pipe to drive the annular dust sweeping plate to rotate and remove dust.

[0004] After the flue gas filtering device has been working for a long time, its filter is prone to clogging, so the filter needs to be cleaned regularly. The existing technology mainly uses reverse blowing to remove dust from the filter. While reverse blowing, the airflow can also blow out impurities trapped in the exhaust duct. Generally, multiple filters are arranged in the exhaust duct of the cracking furnace to filter the flue gas to improve the filtering effect.

[0005] Since the filter will reduce the wind speed, after the reverse airflow passes through 1 to 2 filters, the blowing force of the reverse airflow will not be able to blow away the dust particles on the filter, resulting in poor cleaning effect of the filter. Summary of the invention

[0006] The purpose of the present invention is to provide a cracking furnace with a heating structure, aiming to solve the problem in the prior art that after the reverse airflow passes through 1 to 2 filter screens, the blowing force of the reverse airflow is difficult to blow away the particle dust on the filter screen.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a cracking furnace with a heating structure, comprising a smoke exhaust device and a furnace body, wherein the smoke exhaust device is installed on the top of the furnace body and is used to filter the smoke generated by the cracking furnace, and also comprises an air suction component for sucking air into the smoke exhaust device.

[0008] The smoke exhaust device includes a box body, a filter assembly, a push block and a plurality of bidirectional screws fixedly connected end to end and rotatably installed on the top of both sides of the inner wall of the box body. There are a plurality of filter assemblies which are evenly distributed inside the box body along the axial direction of the bidirectional screws. The top ends of the plurality of filter assemblies are respectively sleeved on the middle parts of the outer walls of the plurality of bidirectional screws, and the push block is slidably installed on the inner bottom wall of the box body along the axial direction of the bidirectional screws.

[0009] The filter assembly includes a filter plate, a square frame, a slider and a hinge. The filter plate and the square frame are arranged parallel to each other and the bottoms of the two are hinged by a hinge. There are two sliders and both are threadedly sleeved on the bidirectional screw. The two sliders are respectively located in the middle of the top of the filter plate and the square frame. Both sides of the top of the filter plate and the square frame are provided with connecting parts hinged to the two sides of the sliders.

[0010] The effect is that when reverse blowing and dust removal are performed on an exhaust duct with multiple filters, it can ensure that the same section of reverse airflow only needs to pass through one filter, avoiding the need for the same section of reverse airflow to pass through multiple filters, resulting in the wind speed and wind force of the airflow gradually decreasing, thereby improving the reverse blowing and dust removal effect of the filter.

[0011] A plurality of fixed baffles evenly distributed in the vertical direction are fixedly connected between the two sides of the inner wall of the square frame, and a lifting baffle arranged parallel to the fixed baffle is slidably sleeved in the vertical direction in the square frame. A plurality of ventilation grooves evenly distributed in the vertical direction are opened on both sides of the lifting baffle, and the width of the ventilation grooves is the same as that of the fixed baffle and the number of the two is the same. A protrusion is provided in the middle of the bottom end of the lifting baffle, and the protrusion slides through the bottom wall of the square frame and is hinged to a horizontally arranged roller.

[0012] The effect is that, by setting the lifting baffle, the ash blown off the previous filter plate by the airflow is prevented from being blown onto the next filter plate, so that the dust adheres to the next filter plate and cannot be cleaned out of the smoke exhaust device. At the same time, it further ensures that the same section of reverse airflow only needs to pass through one filter, avoiding the same section of reverse airflow needing to pass through multiple filters, resulting in the wind speed and wind force of the airflow gradually decreasing.

[0013] An elastic member is connected between the top of the lifting baffle and the inner top wall of the square frame. There are multiple elastic members that are evenly arranged along the horizontal direction of the square frame.

[0014] The effect is that it can ensure that when the filter plate and the square frame become a V-shape with the opening facing upward, the lifting baffle can smoothly descend along the vertical direction of the square frame, so that the ventilation groove of the square frame coincides with the fixed baffle, ensuring that the inner frame of the square frame can be closed, so that the airflow can only pass through the gap formed between the filter component away from the slider and the inner bottom wall of the box body, and blow to one of the filter components located above the slider.

[0015] Guide plates are fixedly installed on the front and rear sides of the inner bottom wall of the box body, and sliding grooves are opened on the bottom of the left and right sides of the push block. The push block is slidably sleeved on the two guide plates through the sliding grooves. The cross-section of the guide plate is an isosceles trapezoid with a short upper part and a long lower part.

[0016] Racks are fixedly installed between the two guide plates and the front and rear walls of the box body respectively. A through slot is opened on the end wall of the push block. A bidirectional motor is arranged inside the through slot. The two output shafts of the bidirectional motor extend out of the through slot and are fixedly installed with gears meshing with the racks.

[0017] The effect is that the guide plate can limit and guide the moving direction of the push block. At the same time, the cross-section of the guide plate is an isosceles trapezoid that is short at the top and long at the bottom, which can make the roller at the bottom of the lifting baffle move along the inclined surface of the push block to the top surface of the push block, thereby driving the lifting baffle to rise along the vertical direction of the square frame, and then the ventilation groove of the lifting baffle above the insulation push block coincides with the gap between the two fixed baffles, so that the airflow can smoothly blow through the filter plate above the push block, and blow the ash on the filter plate to the bottom of the box body.

[0018] A dust box is fixedly installed at the bottom of one end of the box body, the interior of the dust box is connected to the interior of the box body, the suction pipe of the suction assembly is connected to the top of the dust box and a dustproof net is provided at the connection between the two, and the other end of the box body is provided with a smoke exhaust pipe connected to its interior.

[0019] The effect is that the push block can push the smoke ash blown back from the filter plate into the dust collecting box, making it easy to collect and process the smoke ash blown back.

[0020] Both sides of the filter assembly are provided with telescopic sleeves sleeved on the outer wall of the bidirectional screw to prevent dust inside the box body from being adsorbed on the outer wall of the bidirectional screw.

[0021] A driving member for driving the bidirectional screw to rotate is installed at one end of the box body, wherein one end of the bidirectional screw close to the driving member rotates through the box body and is drivingly connected to the output shaft of the driving member.

[0022] The effect is that dust inside the box body can be prevented from being adsorbed on the outer wall of the bidirectional screw, thereby ensuring that the device can run smoothly and extending the service life of the device.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] When reverse blowing and dust removal is performed on an exhaust duct with multiple filters, it is ensured that the same section of reverse airflow only needs to pass through one filter, avoiding the same section of reverse airflow needing to pass through multiple filters, which causes the wind speed and wind force of the airflow to gradually decrease, thereby improving the reverse blowing and dust removal effect of the filter. At the same time, it also avoids the soot blown off the previous filter plate by the airflow from being blown onto the next filter plate, causing the dust to adhere to the next filter plate and unable to be cleaned out of the smoke exhaust device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a structural schematic diagram of the cracking furnace of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the smoke exhaust filter device of the present invention;

[0028] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0029] Figure 4 This is a schematic diagram of the internal structure of the smoke exhaust filter device of the present invention from a front view;

[0030] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at B in FIG.

[0031] Figure 6 It is a structural schematic diagram of the filtering mechanism in the present invention;

[0032] Figure 7 It is a structural schematic diagram of the hinge in the present invention;

[0033] Figure 8 It is a structural schematic diagram of the push block in the present invention.

[0034] In the figure: 1. smoke exhaust device; 11. box body; 12. filter assembly; 121. filter plate; 122. frame; 123. slider; 124. fixed baffle; 125. lifting baffle; 126. ventilation groove; 127. hinge; 128. elastic member; 129. roller; 13. push block; 131. through groove; 132. slide groove; 133. gear; 134. rack; 14. smoke exhaust pipe; 15. guide plate; 16. dust box; 161. dust net; 17. bidirectional screw; 171. telescopic sleeve; 172. driving member; 2. furnace body; 3. suction assembly; 4. burner. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 8 The present invention provides the following technical solution: a cracking furnace with a heating structure, comprising a smoke exhaust device 1, a furnace body 2, an air suction component 3 and a burner 4, wherein the burner 4 is installed on one side of the furnace body 2 for heating the inside of the furnace body 2, the smoke exhaust device 1 is installed on the top of the furnace body 2 for filtering the smoke exhausted by the burner 4, and the air suction component 3 is installed on the furnace body 2 for sucking air into the smoke exhaust device 1 to form a negative pressure inside it.

[0037] refer to Figure 2 and Figure 4 As shown, the smoke exhaust device 1 includes a box body 11, a filter assembly 12, a push block 13 and a bidirectional screw 17. There are multiple bidirectional screws 17, and the multiple bidirectional screws 17 are fixedly connected end to end and rotatably installed on the top of both sides of the inner wall of the box body 11. A driving member 172 is installed at one end of the box body 11. The driving member 172 is a motor in this embodiment. One end of the bidirectional screws 17 close to the driving member 172 rotates through the box body 11 and is connected to the output shaft of the driving member 172. The driving member 172 is used to drive the bidirectional screw 17 to rotate. There are multiple filter assemblies 12 and they are evenly distributed inside the box body 11 along the axial direction of the bidirectional screw 17. The top ends of the multiple filter assemblies 12 are respectively sleeved on the middle parts of the outer walls of the multiple bidirectional screws 17. The push block 13 is installed on the inner bottom wall of the box body 11 and along the axial direction of the bidirectional screw 17, and is used to push the particle dust that falls on the bottom of the box body 11 out of the box body 11.

[0038] refer to Figure 6 As shown, the filter assembly 12 includes a filter plate 121, a square frame 122, a slider 123 and a hinge 127. The filter plate 121 and the square frame 122 are arranged parallel to each other and one side contacts each other. The bottom of the filter plate 121 and the square frame 122 are hinged by the hinge 127. There are two sliders 123 and both are threadedly sleeved on the bidirectional screw 17. The two sliders 123 are respectively located in the middle of the top of the filter plate 121 and the square frame 122. Both sides of the top of the filter plate 121 and the square frame 122 are provided with connecting parts hinged to both sides of the sliders 123.

[0039] When the smoke exhaust device 1 is back-blowing for cleaning, the suction component 3 starts to suck out the air in the box body 11, so that airflow is formed inside it, and at the same time, the driving member 172 drives the bidirectional screw 17 to rotate. At this time, the top ends of the filter plate 121 and the square frame 122 are threadedly connected with the bidirectional screw 17 through the slider 123, so that the filter plate 121 and the square frame 122 become a V-shape with the opening facing upward, and at the same time, the slider 123 starts to slide from one end of the box body 11 to the other end. When the slider 123 is located below one of the filter components 12, the hinge 127 at the bottom of the filter plate 121 and the square frame 122 just contacts the top of the slider 123. At this time, the airflow in the box body 11 can only pass through the filter plate 121 of the filter component 12, and the filter plate 121 of the filter component 12 is removed. The soot on the filter plate 121 is blown to the bottom of the box body 11. As the slider 123 continues to move, the slider 123 moves to the bottom of the next filter component 12. At this time, a gap is formed between the previous filter component 12 and the bottom of the box body 11. The airflow blows through the gap to the filter component 12 above the slider 123, and blows the soot on the filter plate 121 on the filter component 12 to the bottom of the box body 11. Therefore, this solution can ensure that the same section of reverse airflow only needs to pass through one filter when performing reverse blowing and dust removal on an exhaust duct with multiple filters, thereby avoiding the need for the same section of reverse airflow to pass through multiple filters, resulting in a gradual decrease in the wind speed and wind force of the airflow, thereby improving the reverse blowing and dust removal effect of the filter.

[0040] A plurality of fixed baffles 124 evenly distributed in the vertical direction are fixedly connected between the two sides of the inner wall of the square frame 122, and a lifting baffle 125 arranged parallel to the fixed baffle 124 is slidably sleeved in the vertical direction in the square frame 122. A plurality of ventilation grooves 126 evenly distributed in the vertical direction are opened on both sides of the lifting baffle 125. The width of the ventilation grooves 126 is the same as that of the fixed baffle 124 and the number of the two is the same. An elastic member 128 is connected between the top of the lifting baffle 125 and the inner top wall of the square frame 122. There are multiple elastic members 128 and they are evenly arranged in the horizontal direction of the square frame 122. The elastic member 128 is a spring in this embodiment. A protrusion is provided in the middle of the bottom end of the lifting baffle 125. After the protrusion slides through the bottom wall of the square frame 122, it is hinged with a horizontally arranged roller 129.

[0041] As the filter plate 121 and the square frame 122 become a V-shape with the opening facing upward, the lifting baffle 125 descends in the vertical direction of the square frame 122 under the action of its own gravity and the elastic force of the elastic member 128. At this time, the ventilation groove 126 of the lifting baffle 125 overlaps with the fixed baffle 124, so that the inner frame of the square frame 122 is closed, preventing the airflow from passing through the filter plate 121, and also preventing the soot blown off the previous filter plate 121 by the airflow from being blown to the next filter plate. 121, so that the dust adheres to the next filter plate 121 and cannot be cleaned out of the smoke exhaust device 1. When the push block 13 moves to the filter assembly 12, the push block 13 lifts the lifting baffle 125 through the roller 129, so that the ventilation groove 126 of the lifting baffle 125 coincides with the gap between the two fixed baffles 124, so that the air flow can smoothly blow through the filter plate 121 above the push block 13, and the ash on the filter plate 121 is blown to the bottom of the box body 11.

[0042] refer to Figure 2-Figure 4 and Figure 8 As shown, guide plates 15 are fixedly installed on the front and rear sides of the inner bottom wall of the box body 11, and racks 134 are fixedly installed between the two guide plates 15 and the front and rear walls of the box body 11 respectively. Slide grooves 132 are provided on the bottoms of the left and right sides of the push block 13, and the push block 13 is slidably sleeved on the two guide plates 15 through the slide grooves 132. A through groove 131 is provided on the end wall of the push block 13, and a bidirectional motor is provided inside the through groove 131. The two output shafts of the bidirectional motor extend out of the through groove 131 and are fixedly installed with gears 133 meshing with the racks 134. The cross-section of the guide plate 15 is an isosceles trapezoid that is short on the top and long on the bottom.

[0043] When the push block 13 needs to move, the bidirectional motor is started to drive the two gears 133 to rotate. Since the gear 133 is meshing with the rack 134, the gear 133 drives the push block 13 to move forward along the rack 134 and pushes the ash blown to the bottom of the box body 11 to move forward together. When the push block 13 moves to the filter assembly 12, since the two side surfaces of the push block 13 are inclined surfaces, the roller 129 at the bottom of the lifting baffle 125 can move along the inclined surface of the push block 13 to the top surface of the push block 13, thereby driving the lifting baffle 125 to rise in the vertical direction of the frame 122.

[0044] refer to Figure 2 As shown, a dust box 16 is fixedly installed at the bottom of one end of the box body 11, the interior of the dust box 16 is connected with the interior of the box body 11, the suction pipe of the suction component 3 is connected with the top of the dust box 16, and a dustproof net 161 is provided at the connection between the two, which is used to filter the airflow entering the suction component 3 to prevent smoke and dust from entering the suction component 3 with the airflow, and the other end of the box body 11 is provided with a smoke exhaust pipe 14 connected with the interior thereof, which is used to discharge the filtered smoke.

[0045] refer to Figure 4As shown, both sides of the filter assembly 12 are provided with telescopic sleeves 171 sleeved on the outer wall of the bidirectional screw 17 to prevent dust inside the box body 11 from being adsorbed on the outer wall of the bidirectional screw 17 .

[0046] The implementation principle of the embodiment of the present invention is as follows: when it is necessary to clean the multiple filter plates 121 in the smoke exhaust device 1, the suction component 3 is started to suck out the air in the dust box 16 and the box body 11, so that a reverse airflow is formed in the box body 11, and the driving member 172 drives the bidirectional screw 17 to rotate. At this time, the top ends of the filter plates 121 and the frame 122 are separated from each other through the threaded connection of the slider 123 and the bidirectional screw 17, so that the filter plates 121 and the frame 122 become a V-shape with the opening upwards. As the filter plates 121 and the frame 122 become a V-shape with the opening upwards, the lifting baffle Under the action of its own gravity and the elastic force of the elastic member 128, 125 descends in the vertical direction of the square frame 122. At this time, the ventilation groove 126 of the lifting baffle 125 overlaps with the fixed baffle 124, so that the inner frame of the square frame 122 is closed. At the same time, the slider 123 starts to slide from one end of the box body 11 to the other end. When the slider 123 moves to one of the filter components 12, since both side surfaces of the push block 13 are inclined surfaces, the roller 129 at the bottom of the lifting baffle 125 can move along the inclined surface of the push block 13 to the top surface of the push block 13. At this time, the lifting baffle 125 is lifted up, so that The venting groove 126 of the lifting baffle 125 coincides with the gap between the two fixed baffles 124, so that the airflow can smoothly blow through the filter plate 121 above the push block 13. At this time, the hinge 127 at the bottom of the filter plate 121 and the square frame 122 just contacts the top of the slider 123, and the inner frame of the square frame 122 on the filter assembly 12 that is not in contact with the slider 123 is closed, and a gap is formed between the filter assembly 12 and the inner bottom of the box body 11, so that the airflow can only blow to the filter assembly 12 above the slider 123 through the gap, and blow through the filter plate on the filter assembly 12. 121, the soot on the filter plate 121 is blown off to the inner bottom of the box body 11, so that when the exhaust duct with multiple filters is reversely blown for dust removal, the present invention ensures that the same section of reverse airflow only needs to pass through one filter, avoiding the need for the same section of reverse airflow to pass through multiple filters, resulting in the wind speed and wind force of the airflow gradually decreasing, thereby improving the reverse blowing and dust removal effect of the filter, and also avoiding the soot blown off the previous filter plate 121 by the airflow from being blown onto the next filter plate 121, so that the dust adheres to the next filter plate 121 and cannot be cleaned out of the smoke exhaust device 1.

[0047] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A cracking furnace with a heating structure, comprising a smoke exhaust device and a furnace body, wherein the smoke exhaust device is installed on the top of the furnace body and is used to filter the smoke generated by the cracking furnace, characterized in that: Also included is an air suction assembly for suctioning the smoke exhaust device; The smoke exhaust device comprises a box body, a filter assembly, a push block and a plurality of bidirectional screws fixedly connected end to end and rotatably mounted on the top of both sides of the inner wall of the box body, a plurality of filter assemblies are uniformly distributed inside the box body along the axis direction of the bidirectional screws, the top ends of the plurality of filter assemblies are respectively sleeved on the middle of the outer walls of the plurality of bidirectional screws, the push block is slidably mounted on the inner bottom wall of the box body along the axis direction of the bidirectional screws, and both side surfaces of the push block are inclined surfaces; The filter assembly includes a filter plate, a square frame, a slider and a hinge. The filter plate and the square frame are arranged parallel to each other and the bottoms of the two are hinged by a hinge. There are two sliders and both are threadedly sleeved on the bidirectional screw. The two sliders are respectively located at the middle of the top of the filter plate and the square frame. Both sides of the top of the filter plate and the square frame are provided with connecting parts hinged to both sides of the sliders. A plurality of fixed baffles evenly distributed in the vertical direction are fixedly connected between the two sides of the inner wall of the square frame, a lifting baffle parallel to the fixed baffle is slidably sleeved in the vertical direction in the square frame, a plurality of ventilation grooves evenly distributed in the vertical direction are opened on both sides of the lifting baffle, the width of the ventilation groove is the same as the width of the fixed baffle and the number of the two is the same, a protrusion is provided in the middle of the bottom end of the lifting baffle, the protrusion slides through the bottom wall of the square frame and is hinged with a horizontally arranged roller, when the push block moves to the filter assembly, the push block lifts the lifting baffle through the roller, so that the ventilation groove of the lifting baffle coincides with the gap between the two fixed baffles.

2. A cracking furnace with a heating structure according to claim 1, characterized in that: An elastic member is connected between the top of the lifting baffle and the inner top wall of the square frame. There are multiple elastic members and they are evenly arranged along the horizontal direction of the square frame.

3. The cracking furnace with a heating structure according to claim 1, characterized in that: Guide plates are fixedly installed on the front and rear sides of the inner bottom wall of the box body, and sliding grooves are opened on the bottoms of the left and right sides of the push block. The push block is slidably sleeved on the two guide plates through the sliding grooves. The cross-section of the guide plate is an isosceles trapezoid with a short upper part and a long lower part.

4. The cracking furnace with a heating structure according to claim 3, characterized in that: The two guide plates are respectively fixed with racks between the front wall and the rear wall of the box body, a through slot is opened on the end wall of the push block, a bidirectional motor is arranged inside the through slot, and two output shafts of the bidirectional motor extend out of the through slot and are fixed with gears meshing with the racks.

5. The cracking furnace with a heating structure according to claim 1, characterized in that: A dust box is fixedly installed at the bottom of one end of the box body, the interior of the dust box is connected to the interior of the box body, the suction pipe of the suction assembly is connected to the top of the dust box and a dustproof net is provided at the connection between the two, and the other end of the box body is provided with a smoke exhaust pipe connected to its interior.

6. The cracking furnace with a heating structure according to claim 1, characterized in that: Both sides of the filter assembly are provided with telescopic sleeves sleeved on the outer wall of the bidirectional screw, which are used to prevent dust inside the box body from being adsorbed on the outer wall of the bidirectional screw.

7. The cracking furnace with a heating structure according to claim 6, characterized in that: A driving member for driving the bidirectional screw to rotate is installed at one end of the box body, wherein one end of the bidirectional screw close to the driving member rotates through the box body and is drivingly connected to the output shaft of the driving member.

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