Integrated sewage treatment equipment with sludge compression function

Abstract

The invention discloses integrated sewage treatment equipment with a sludge compression function, and particularly relates to the technical field of sewage treatment.The integrated sewage treatment equipment comprises a supporting frame, a treatment assembly is arranged on the supporting frame, the treatment assembly comprises a treatment barrel arranged on the supporting frame, and a lining frame is arranged in the treatment barrel. Sludge and garbage in water can be hooked on the outer side of a filter screen cylinder through a slag hooking plate, and the filter screen cylinder and the slag hooking plate are driven to rotate through a second driving motor on a gathering hopper, so that the sludge and the garbage are conveyed into an extended cavity, and the function of separating water from impurities is realized firstly; sludge, impurities and garbage are gathered together through continuous rotation of the supporting shaft and the auger belt after being gathered together through the polymer cavity, the function of extruding the garbage impurities is achieved, water in the impurities can be discharged through the first screening holes and the second screening holes, the more the sludge impurities in the material gathering disc are gathered, the more the impurities can be discharged through the slag outlet, and the more the impurities can be discharged through the slag outlet. The function of distributing and conveying sludge impurities and water is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more specifically, to an integrated sewage treatment device with a compressed sludge function. Background Art

[0002] Currently, with the development of society, environmental pollution is a problem widely concerned by society. In sewage treatment, there are usually domestic sewage, industrial wastewater, and initial rainwater, etc. The main pollutants in sewage are pathogen pollutants, oxygen-consuming pollutants, plant nutrients, and toxic pollutants, etc. According to the source of sewage, sewage can be defined as a liquid or water carrying waste mixed with groundwater, surface water, snowstorm, etc. discharged from residences, institutions, commercial areas, or industrial areas. Sewage contains a large amount of sludge and impurities, so it is necessary to treat sewage to facilitate subsequent recycling.

[0003] Among them, the patent with the publication number CN220443274U discloses a sewage treatment device, including: a pool body, a filtering mechanism, an impurity treatment mechanism, and a controller; the pool body includes an inlet and an outlet, the filtering mechanism includes a filter plate and a filter plate cleaning mechanism, and the impurity treatment mechanism includes a collection box and a collection box lifting mechanism; the controller is arranged outside the pool body, and the controller is electrically connected to the filter plate cleaning mechanism and the collection box lifting mechanism; When this structure is in use, the controller controls the filter plate cleaning mechanism to clean the impurities on the filter plate into the collection box, and the collection box lifting mechanism can lift the collection box filled with impurities to facilitate the staff to clean the impurities. However, when this structure is in use, it is not easy to filter out the water in the sludge impurities, resulting in a large amount of water in the filtered impurities and sludge, and the filtering treatment effect is not good. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an integrated sewage treatment device with a compressed sludge function, aiming to solve the problems proposed in the above background art.

[0005] The present invention provides the following technical solutions: An integrated sewage treatment device with a compressed sludge function, including a support frame, and a treatment component is arranged on the support frame; The treatment component includes a treatment cylinder arranged on the support frame, an inner lining frame is arranged inside the treatment cylinder, an inner lining cylinder is fixedly arranged in the middle of the inner lining frame, and a plurality of first sieve holes are penetrated through the surface of the inner lining cylinder; A support shaft is arranged in the middle of the inner lining cylinder, a central aggregation cone block for impurity aggregation is fixedly arranged on the support shaft, a polymer cavity for guiding is opened at one end of the central aggregation cone block, and auger belts for conveying impurities are sleeved on the outer sides of the central aggregation cone block and the support shaft; A reinforcing cylinder fixed to the inner wall of the lining cylinder is rotatably connected to the outside of the support shaft. A number of second sieve holes are penetratingly formed in the outside of the reinforcing cylinder facing the first sieve holes. An extension chamber is fixedly arranged at one end of the treatment cylinder. The extension chamber is communicated with the inner lining frame. An aggregation hopper is fixedly arranged at the top of the extension chamber. A filter screen cylinder for filtering sewage is rotatably connected to the middle of the aggregation hopper. A number of slag-hooking plates are fixedly arranged on the outside of the filter screen cylinder. A collecting cylinder is installed on one side of the surface of the aggregation hopper by bolts. The collecting cylinder is communicated with the filter screen cylinder. A rotating shaft fixed to the end of the support shaft is rotatably connected to the middle of the extension chamber. One end of the support frame is installed with a first driving motor for driving the rotating shaft to rotate by bolts. A second driving motor for driving the filter screen cylinder to rotate is arranged outside the aggregation hopper; It can be seen that in the above technical solution, sewage is added into the aggregation hopper and filtered by the filter screen cylinder. The water is filtered by the filter screen cylinder and then conveyed into the collecting cylinder. The sludge and garbage in the water can be hooked on the outside of the filter screen cylinder by the slag-hooking plates. The second driving motor on the aggregation hopper drives the filter screen cylinder and the slag-hooking plates to rotate, so that the sludge and garbage can be conveyed into the extension chamber, and the function of separating water and impurities is realized first. The impurities falling into the extension chamber are driven by the first driving motor to rotate the rotating shaft. The rotating shaft drives the support shaft, the central aggregation cone block and the auger belt to rotate, and then the sludge impurities containing water can be conveyed to the central aggregation cone block by the auger belt and gathered through the polymer chamber. After the sludge, impurities and garbage are gathered through the polymer chamber, the garbage is gathered together by the continuous rotation of the support shaft and the auger belt, realizing the function of squeezing the garbage impurities, so that the water in the impurities can be discharged through the first sieve holes and the second sieve holes, realizing the function of compressing the sludge impurities; Optionally, in a possible implementation manner, an electric push rod is installed at one end of the support frame away from the first driving motor by bolts. A guide ring is fixedly arranged at one end of the treatment cylinder close to the electric push rod. A material gathering plate is arranged at the output end of the electric push rod. The material gathering plate is located on one side inside the inner lining frame. The material gathering plate is slidably connected with the inner lining frame and the guide ring. A scraping ring is fixedly arranged on the material gathering plate. A central column is fixedly arranged in the middle of the material gathering plate. A number of diversion cavities for guiding impurities are formed in the outside of the central column. A number of slag discharge ports are penetratingly formed in the inner wall of the material gathering plate. A plurality of the slag discharge ports are all distributed outside the central column. A receiving box is installed at the bottom of the support frame by bolts. The top of the receiving box extends to the bottom of the treatment cylinder and is communicated with the treatment cylinder. A number of heat conducting plates are sleeved outside the inner lining frame, and heating rods for heating are arranged on each of the heat conducting plates; It can be seen that in the above technical solution, after the sludge impurities accumulated in the polymerizing cavity reach a certain amount, they are discharged after being blocked by the central aggregation cone block. The sludge impurities are continuously conveyed and come into contact with the central column, and are diverted through each diversion cavity, preventing the silt impurities from accumulating together and blocking the device. At the same time, as the silt impurities in the material collecting tray accumulate more and more, the impurities can be discharged through the slag outlet. At the same time, the heating rod can also heat each heat conduction plate, thereby realizing the heating of the silt impurities conveyed in the inner lining frame, achieving the function of quickly dehydrating the silt impurities, facilitating the compression of the silt impurities into lumps, and the water filtered and discharged through the first sieve holes and the second sieve holes can be collected by the receiving box; Technical effects and advantages of the present invention: 1. In the present invention, sewage is added to the aggregation hopper, and the sewage is filtered by the filter screen cylinder. After filtration, it is conveyed to the collection cylinder, and the sludge and garbage in the water can be hooked on the outer side of the filter screen cylinder by the slag hooking plate. The filter screen cylinder and the slag hooking plate are driven to rotate by the second drive motor on the aggregation hopper, so that the silt garbage can be conveyed to the extension chamber, and the function of separating water and impurities is realized first; 2. In the present invention, the support shaft, the central aggregation cone block and the auger belt rotate, so that the sludge impurities containing water are conveyed to the central aggregation cone block by the auger belt and gathered in the polymerizing cavity. After the sludge, impurities and garbage are gathered in the polymerizing cavity, the garbage is gathered together by the continuous rotation of the support shaft and the auger belt, realizing the function of squeezing the garbage impurities, so that the water in the impurities can be discharged through the first sieve holes and the second sieve holes, and the function of compressing the sludge impurities is realized; 3. In the present invention, after the sludge impurities accumulated in the polymerizing cavity reach a certain amount, they are discharged after being blocked by the central aggregation cone block. The sludge impurities are continuously conveyed and come into contact with the central column, and are diverted through each diversion cavity, preventing the silt impurities from accumulating together and blocking the device. At the same time, as the silt impurities in the material collecting tray accumulate more and more, the impurities can be discharged through the slag outlet; 4. In the present invention, the heating rod can also heat each heat conduction plate, thereby realizing the heating of the silt impurities conveyed in the inner lining frame, achieving the function of quickly dehydrating the silt impurities, facilitating the compression of the silt impurities into lumps, and the water filtered and discharged through the first sieve holes and the second sieve holes can be collected by the receiving box; In summary, through the corresponding cooperation of each structure, the sludge and garbage in the water can be hooked on the outer side of the filter screen cylinder by the slag-hooking plate. The filter screen cylinder and the slag-hooking plate are driven to rotate by the second driving motor on the collecting hopper, so that the sludge and garbage can be conveyed to the extended chamber, and the function of separating water and impurities is realized first. The sludge impurities containing water are conveyed to the central collecting cone block by the auger belt and gathered in the polymerizing chamber. After the sludge, impurities and garbage are gathered in the polymerizing chamber, the garbage is gathered together by the continuous rotation of the support shaft and the auger belt, realizing the function of squeezing the garbage impurities, so that the water in the impurities can be discharged through the first sieve holes and the second sieve holes, realizing the function of compressing the sludge impurities. After the sludge impurities accumulated in the polymerizing chamber reach a certain amount, they are discharged after being blocked by the central collecting cone block. The sludge impurities are continuously conveyed and contact the central column, and are shunted through each shunting chamber to avoid the accumulation of sludge impurities and blockage of the device. At the same time, when the sludge impurities in the material collecting tray accumulate more and more, the impurities can be discharged through the slag outlet, realizing the function of shunting and conveying the sludge impurities and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions in the present disclosure, the following will briefly introduce the drawings required to be used in some embodiments. Obviously, the drawings in the following description are only the drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limitations on the actual sizes of the products, the actual processes of the methods, the actual timings of the signals, etc. involved in the embodiments of the present disclosure.

[0007] Figure 1 Schematic diagram of the overall structure of the present invention.

[0008] Figure 2 Cross-sectional view of the overall structure of the present invention.

[0009] Figure 3 Schematic diagram of the material collecting tray, scraping ring and central column of the present invention.

[0010] Figure 4 Schematic diagram of the support frame, treatment cylinder, first driving motor, guiding ring and electric push rod of the present invention.

[0011] Figure 5 Schematic diagram of the inner lining frame, collecting hopper, extended chamber and collecting cylinder of the present invention.

[0012] Figure 6 Schematic diagram of the inner lining frame, strengthening cylinder, support shaft, auger belt and central collecting cone block of the present invention.

[0013] Figure 7 Schematic diagram of the extended chamber, collecting cylinder, filter screen cylinder, slag-hooking plate and collecting hopper of the present invention.

[0014] Figure 8 Schematic diagram of the collection cylinder of the present invention.

[0015] The reference numerals in the drawings are: 1, support frame; 2, treatment cylinder; 3, inner lining frame; 4, inner lining cylinder; 5, first sieve hole; 6, support shaft; 7, auger belt; 8, central aggregation cone block; 9, polymer chamber; 10, strengthening cylinder; 11, second sieve hole; 12, extension chamber; 13, aggregation hopper; 14, filter screen cylinder; 15, slag hook plate; 16, collection cylinder; 17, rotating shaft; 18, first drive motor; 19, second drive motor; 20, electric push rod; 21, guide ring; 22, material gathering plate; 23, scraping ring; 24, central column; 25, diversion chamber; 26, slag outlet; 27, receiving box; 28, heat conducting plate; 29, heating rod. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] As shown in the attached Figure 1 - Figure 8 In the integrated sewage treatment equipment with the function of compressing sludge shown, through the treatment components arranged on the support frame 1, the sludge and garbage in the water can be hooked on the outer side of the filter screen cylinder 14 by the slag hook plate 15. Driven by the second drive motor 19 on the aggregation hopper 13, the filter screen cylinder 14 and the slag hook plate 15 rotate, so that the silt garbage can be transported into the extension chamber 12, and the function of separating water and impurities is realized first. The sludge impurities containing water are transported to the central aggregation cone block 8 through the auger belt 7 and gathered in the polymer chamber 9. After the sludge, impurities and garbage are gathered in the polymer chamber 9, the garbage is gathered together by the continuous rotation of the support shaft 6 and the auger belt 7, realizing the function of extruding the garbage impurities, so that the water in the impurities can be discharged through the first sieve hole 5 and the second sieve hole 11, realizing the function of compressing the sludge impurities. After the sludge impurities accumulated in the polymer chamber 9 reach a certain amount, they are discharged after being blocked by the central aggregation cone block 8. The sludge impurities are continuously transported and contact with the central column 24, and are diverted through each diversion chamber 25 to avoid the accumulation of silt impurities together and blocking the device. At the same time, when the sludge impurities in the material gathering plate 22 accumulate more and more, the impurities can be discharged through the slag outlet 26, realizing the function of diverting and transporting the sludge impurities and water, and the specific structure of the components is set as follows; The processing component includes a processing cylinder 2 arranged on a support frame 1. Inside the processing cylinder 2, there is a lining frame 3. In the middle of the lining frame 3, a lining cylinder 4 is fixedly arranged. A number of first sieve holes 5 are penetrated on the surface of the lining cylinder 4; In the middle of the lining cylinder 4, there is a support shaft 6. On the support shaft 6, a central aggregation cone block 8 for impurity aggregation is fixedly arranged. At one end of the central aggregation cone block 8, a polymer cavity 9 for guiding flow is opened. On the outer sides of the central aggregation cone block 8 and the support shaft 6, there is a screw conveyor belt 7 for conveying impurities; On the outer side of the support shaft 6, there is a reinforcing cylinder 10 rotatably connected and fixed to the inner wall of the lining cylinder 4. A number of second sieve holes 11 are penetrated on the outer side of the reinforcing cylinder 10 facing the first sieve holes 5. At one end of the processing cylinder 2, an extended chamber 12 is fixedly arranged. The extended chamber 12 is communicated with the lining frame 3. At the top of the extended chamber 12, an aggregation hopper 13 is fixedly arranged. In the middle of the aggregation hopper 13, a filter screen cylinder 14 for filtering sewage is rotatably connected. On the outer side of the filter screen cylinder 14, a number of slag-hooking plates 15 are fixedly arranged. On one side of the surface of the aggregation hopper 13, a collection cylinder 16 is installed by bolts. The collection cylinder 16 is communicated with the filter screen cylinder 14. In the middle of the extended chamber 12, a rotating shaft 17 fixed to the end of the support shaft 6 is rotatably connected. At one end of the support frame 1, a first driving motor 18 for driving the rotating shaft 17 to rotate is installed by bolts. On the outer side of the aggregation hopper 13, a second driving motor 19 for driving the filter screen cylinder 14 to rotate is arranged; At one end of the support frame 1 away from the first driving motor 18, an electric push rod 20 is installed by bolts. At one end of the processing cylinder 2 close to the electric push rod 20, a guiding ring 21 is fixedly arranged. At the output end of the electric push rod 20, there is a material-aggregating plate 22. The material-aggregating plate 22 is located on one side inside the lining frame 3. The material-aggregating plate 22 is slidably connected with the lining frame 3 and the guiding ring 21. On the material-aggregating plate 22, a scraping ring 23 is fixedly arranged. In the middle of the material-aggregating plate 22, a central column 24 is fixedly arranged. On the outer side of the central column 24, a number of diversion chambers 25 for guiding impurities are opened. On the inner wall of the material-aggregating plate 22, a number of slag outlets 26 are penetrated. The multiple slag outlets 26 are all distributed on the outer side of the central column 24. At the bottom of the support frame 1, a receiving box 27 is installed by bolts. The top of the receiving box 27 extends to the bottom of the processing cylinder 2 and is communicated with the processing cylinder 2. A number of heat-conducting plates 28 are sleeved on the outer side of the lining frame 3, and on each heat-conducting plate 28, a heating rod 29 for heating is arranged.

[0018] When the above-mentioned structure is in use, the staff installs the device at a designated position. When cleaning sewage, the sewage is added into the aggregation hopper 13, and the sewage is filtered by the filter screen cylinder 14. The water is transported into the collection cylinder 16 after being filtered by the filter screen cylinder 14, while the sludge and garbage in the water can be hooked on the outer side of the filter screen cylinder 14 by the slag-hooking plate 15. The second drive motor 19 on the aggregation hopper 13 drives the filter screen cylinder 14 and the slag-hooking plate 15 to rotate, so that the sludge and garbage can be transported into the extension chamber 12, and the function of separating water and impurities is realized first; Further, as Figure 2 and 8 shown, one end of the collection cylinder 16 with a notch extends into the filter screen cylinder 14. After the water is filtered by the filter screen cylinder 14, the impurities remain on its surface, and the water is transported into the collection cylinder 16 through the notch on the collection cylinder 16.

[0019] The impurities falling into the extension chamber 12 are driven by the first drive motor 18 to rotate the rotating shaft 17. The rotating shaft 17 drives the support shaft 6, the central aggregation cone 8 and the auger belt 7 to rotate, and then the sludge impurities containing water are transported to the central aggregation cone 8 through the auger belt 7 and gathered in the polymer chamber 9. After the sludge, impurities and garbage are gathered in the polymer chamber 9, the garbage is gathered together by the continuous rotation of the support shaft 6 and the auger belt 7, realizing the function of squeezing the garbage impurities, so that the water in the impurities can be discharged through the first sieve holes 5 and the second sieve holes 11, realizing the function of compressing the sludge impurities; At the same time, after the sludge impurities accumulated in the polymer chamber 9 reach a certain amount, they are discharged after being blocked by the central aggregation cone 8. The sludge impurities are continuously transported and contact the central column 24, and are shunted through each shunt chamber 25 to prevent the sludge impurities from accumulating together and blocking the device. At the same time, when the sludge impurities in the material gathering tray 22 accumulate more and more, the impurities can be discharged through the slag outlet 26. At the same time, the heating rod 29 can heat each heat conduction plate 28, and then realize heating the sludge impurities transported in the inner lining frame 3, realizing the function of quickly dehydrating the sludge impurities, facilitating the compression of the sludge impurities into lumps, and the water filtered and discharged through the first sieve holes 5 and the second sieve holes 11 can be collected by the receiving box 27.

[0020] Different from the prior art, the present application discloses an integrated sewage treatment device with a compressed sludge function. Sludge and garbage in water can be hooked on the outer side of the filter screen cylinder 14 by the slag hooking plate 15. Driven by the second drive motor 19 on the aggregation hopper 13, the filter screen cylinder 14 and the slag hooking plate 15 rotate, so that the silt and garbage can be conveyed into the extension chamber 12, and the function of separating water and impurities is realized for the first time. The sludge impurities containing water are conveyed to the central aggregation cone 8 by the auger belt 7 and aggregated in the polymerizing chamber 9. After the sludge, impurities and garbage are aggregated in the polymerizing chamber 9, the garbage is aggregated together by the continuous rotation of the support shaft 6 and the auger belt 7, realizing the function of squeezing the garbage impurities, so that the water in the impurities can be discharged through the first sieve holes 5 and the second sieve holes 11, realizing the function of compressing the sludge impurities. After the sludge impurities accumulated in the polymerizing chamber 9 reach a certain amount, they are discharged after being blocked by the central aggregation cone 8. The sludge impurities are continuously conveyed and contact the central column 24, and are shunted through each shunt chamber 25 to prevent the silt impurities from accumulating together and blocking the device. At the same time, when the sludge impurities in the material gathering tray 22 accumulate more and more, the impurities can be discharged through the slag outlet 26, realizing the function of shunt conveying of the sludge impurities and water.

[0021] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated sewage treatment equipment with a compressed sludge function, including a support frame (1), characterized in that: A processing component is provided on the support frame (1). The processing component includes a processing cylinder (2) provided on the support frame (1). An inner support frame (3) is provided inside the processing cylinder (2). A middle part of the inner support frame (3) is fixedly provided with an inner liner cylinder (4). A plurality of first sieve holes (5) are formed through the surface of the inner liner cylinder (4). A support shaft (6) is provided in the middle part of the inner liner cylinder (4). A central aggregation cone block (8) for impurity aggregation is fixedly provided on the support shaft (6). A polymer cavity (9) for guiding flow is formed at one end of the central aggregation cone block (8). Auger belts (7) for conveying impurities are sleeved on the outer sides of the central aggregation cone block (8) and the support shaft (6). The outer side of the support shaft (6) is rotatably connected to a reinforcement cylinder (10) fixed to the inner wall of the inner liner cylinder (4). A plurality of second sieve holes (11) are formed through the outer side of the reinforcement cylinder (10) facing the first sieve holes (5).

2. The integrated sewage treatment equipment with the function of compressing sludge according to claim 1, characterized in that: An extension chamber (12) is fixedly provided at one end of the processing cylinder (2). The extension chamber (12) is communicated with the inner support frame (3). An aggregation hopper (13) is fixedly provided at the top of the extension chamber (12).

3. The integrated sewage treatment equipment with the function of compressed sludge according to claim 2, characterized in that: A filter screen cylinder (14) for filtering sewage is rotatably connected to the middle part of the aggregation hopper (13). A plurality of hook slag plates (15) are fixedly provided on the outer side of the filter screen cylinder (14).

4. The integrated sewage treatment equipment with the function of compressed sludge according to claim 3, characterized in that: A collection cylinder (16) is installed on one side of the surface of the aggregation hopper (13) by bolts. The collection cylinder (16) is communicated with the filter screen cylinder (14). A rotating shaft (17) fixed to the end of the support shaft (6) is rotatably connected to the middle part of the extension chamber (12).

5. The integrated sewage treatment equipment with compressed sludge function according to claim 4, characterized in that: A first driving motor (18) for driving the rotating shaft (17) to rotate is installed on one end of the support frame (1) by bolts. A second driving motor (19) for driving the filter screen cylinder (14) to rotate is provided on the outer side of the aggregation hopper (13).

6. The integrated sewage treatment equipment with the function of compressing sludge according to claim 1, characterized in that: An electric push rod (20) is installed on one end of the support frame (1) far from the first driving motor (18) by bolts. A guiding ring (21) is fixedly provided at one end of the processing cylinder (2) close to the electric push rod (20).

7. The integrated sewage treatment equipment with the function of compressing sludge according to claim 6, characterized in that: A material aggregation plate (22) is provided at the output end of the electric push rod (20). The material aggregation plate (22) is located on one side inside the inner support frame (3). The material aggregation plate (22) is slidably connected to the inner support frame (3) and the guiding ring (21).

8. The integrated sewage treatment equipment with the function of compressing sludge according to claim 7, characterized in that: A scraping ring (23) is fixedly provided on the material aggregation plate (22). A central column (24) is fixedly provided in the middle part of the material aggregation plate (22).

9. The integrated sewage treatment equipment with the function of compressing sludge according to claim 8, characterized in that: A plurality of diversion cavities (25) for guiding impurities are formed on the outer side of the central column (24). A plurality of slag discharge ports (26) are formed through the inner wall of the material aggregation plate (22). A plurality of the slag discharge ports (26) are all distributed on the outer side of the central column (24).

10. The integrated sewage treatment equipment with the function of compressing sludge according to claim 1, characterized in that: The bottom of the support frame (1) is installed with a receiving box (27) through bolts. The top of the receiving box (27) extends to the bottom of the treatment cylinder (2) and is communicated with the treatment cylinder (2). A plurality of heat conducting plates (28) are sleeved on the outer side of the inner lining frame (3), and heating rods (29) for heating are arranged on each of the heat conducting plates (28).

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