A high-efficiency waste heat recovery shaping machine

Abstract

The present invention discloses a high-efficiency waste heat recovery shaping machine, comprising a plurality of heat recovery devices connected in series or in parallel, the first N sections of the oven body are preheating sections provided with air inlets, the remaining ovens are divided into several connected shaping sections from front to back, each shaping section comprises one to several sections of ovens, the exhaust ports of the ovens on each shaping section are connected and connected to a corresponding heat recovery device, the tail gas discharged from the ovens on the shaping section enters the corresponding heat recovery device for heat exchange and cooling and then is discharged, the exhaust ports of the ovens in the preheating section are also connected and connected to a corresponding heat recovery device, the tail gas discharged from the ovens on the preheating section enters the corresponding heat recovery device for heat exchange and cooling and then is discharged, and the outside air enters the ovens in the preheating section after heat exchange and heating through one or more heat recovery devices. The present invention provides a high-efficiency waste heat recovery shaping machine that can efficiently and flexibly utilize heat while reducing the waste of heat emission.

Description

Technical Field

[0001] The invention relates to a high-efficiency waste heat recovery shaping machine, belonging to the technical field of shaping machine equipment. Background Art

[0002] The setting machine is an important equipment for textile printing and dyeing finishing. It can improve the feel, slippage, color, width, strength, appearance, etc. of textiles. It is used in various types of textiles. After being finished by the setting machine, it can stabilize the size of the fabric. The setting machine is also the main energy-consuming equipment in the textile printing and dyeing industry. It is a device that uses hot air to dry, finish and shape the fabric. The existing setting machine is mainly composed of a drying oven body and a cloth roll conveying device, etc., wherein the drying oven body is composed of a plurality of oven sections connected in sequence from front to back, and each oven section is provided with a relatively independent hot air circulation device, a heating device, an exhaust duct and a supplementary air inlet. Because the textiles have moisture before entering the drying oven body of the setting machine, and contain additives such as printing and dyeing auxiliaries remaining in the weaving process, and the drying oven of the setting machine The hot air temperature in the box is generally around 200°C. Therefore, when the textile passes through the drying box of the setting machine, the tail gas generated by high-temperature baking contains a large amount of water vapor, high-temperature evaporated dyes and auxiliary organic matter, vaporized solvents, and mechanical impurities such as fine lint fibers of the textile. The tail gas still maintains a relatively high temperature of about 170°C. If these tail gases are directly reused, the impurities contained in them will pollute the fabric. Now, heat is generally recovered and reused through a heat exchanger. Before the existing setting machine cold air enters the drying box, it usually only undergoes one heat exchange and temperature rise before entering the setting section of the drying box. On the one hand, it is difficult to fully and effectively recover the heat of the tail gas according to the actual situation. On the other hand, the temperature difference between the heated cold air and the temperature in the setting section is large, which is not conducive to temperature stability and affects the setting effect. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a high-efficiency waste heat recovery molding machine. The cold air can undergo one or more heat exchanges according to actual needs to recover the heat of the exhaust gas and use it as the preliminary hot air of the molding machine. This can reduce the waste of heat discharge and is beneficial to the stability of the temperature, thereby solving the shortcomings of the prior art.

[0004] The technical solution of the present invention is: a high-efficiency waste heat recovery and shaping machine, including an oven body composed of multiple ovens arranged in sequence from front to back, the ovens are provided with exhaust ports, including several heat recovery devices connected in series or in parallel, the first N ovens of the oven body are preheating sections provided with air inlets, and the remaining ovens are divided into several connected shaping sections from front to back, each shaping section includes 1 to several ovens, the exhaust ports of the ovens on each shaping section are connected and connected to a corresponding heat recovery device, the exhaust gas discharged from the ovens on the shaping section enters the corresponding heat recovery device for heat exchange and cooling and is then discharged, the exhaust port of the ovens in the preheating section is also connected and connected to a corresponding heat recovery device, the exhaust gas discharged from the ovens on the preheating section enters the corresponding heat recovery device for heat exchange and cooling and is then discharged, and the outside air enters the oven in the preheating section after heat exchange and heating through one or more heat recovery devices.

[0005] Furthermore, a detachable filter screen is installed at the air outlet of each oven.

[0006] Furthermore, the heat recovery device includes a base and several heat exchangers installed on the base, and the several heat exchangers include an external shell and multiple heat exchange tubes vertically installed in the shell. The base is provided with a channel connecting the several heat exchangers.

[0007] Furthermore, a group of tube sheets with tube holes evenly arranged are installed in the shell of the heat exchanger, and multiple heat exchange tubes are installed between the two tube sheets and are connected to the corresponding tube holes respectively. Some or all of the heat exchange tubes are metal thin tubes with a wall thickness of no more than 1 mm. Connecting pipe sleeves are inserted at both ends of the metal thin tubes. The connecting pipe sleeves at both ends are welded or expanded and fixed to the corresponding tube holes of the corresponding tube sheets through a tube expander.

[0008] In a further aspect, the heat exchange tube is a thick metal tube with a wall thickness of not less than 1.5 mm. Both ends of the thick metal tube are welded or fixed to corresponding tube holes of corresponding tube sheets by expansion joints using a tube expander to serve as support between the tube sheets.

[0009] Furthermore, after the connecting pipe sleeve is fixed on the tube sheet, its connection end with the metal thin tube is located on the inner side of the tube sheet, and the metal thin tube is connected with the inner or outer socket of the tube.

[0010] Furthermore, the connection surface between the connecting pipe sleeve and the metal thin pipe for plug-in cooperation is a guiding cone surface.

[0011] Furthermore, the other end of the connecting sleeve includes an outer convex edge, and when the connecting sleeve is inserted into the tube hole of the tube plate, the outer convex edge and the outer side of the tube plate are limited and stopped.

[0012] Furthermore, the heat exchange tube is a spiral tube with extruded inner and outer walls, and both ends of the spiral tube are connection ends without spiral extrusion.

[0013] It further includes a lifting frame that can be raised and lowered and adjusted, the heat recovery device includes a waste heat inlet, a waste heat outlet, a cold air inlet, and a hot air outlet, the lifting frame is connected to a ventilation pipe that is connected to the waste heat inlet, the waste heat outlet, the cold air inlet, and the hot air outlet, and the ventilation pipe includes a soft connection section.

[0014] Furthermore, an isolation device is provided between the preheating section and the adjacent shaping section, and the isolation device separates the upper and lower spaces of the oven except for the cloth feeding space.

[0015] By implementing the present invention, the tail gas of the preheating section oven is discharged after heat exchange and cooling through the corresponding heat recovery device, and the tail gas of the ovens of several shaping sections is also discharged after heat exchange and cooling through the corresponding heat recovery devices. The heat recovery devices are connected in series or in parallel and are connected to the upper air inlet of the oven in the preheating section. The outside air enters the oven in the preheating section for use as preliminary hot air after heat exchange and temperature increase through one or more heat recovery devices according to practical needs, so as to replace the heating device. The temperature difference between the preheating section and the preheating section is also small, which can reduce the waste of heat emission and can be used efficiently and flexibly, while helping to maintain temperature stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a first connection schematic diagram of the present invention;

[0017] Figure 2 is a second connection schematic diagram of the present invention;

[0018] Figure 3 is a third connection schematic diagram of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of the first heat exchanger and the second heat exchanger;

[0020] Figure 5 It is a schematic diagram of the structure of the heat exchanger;

[0021] Figure 6 for Figure 5 A magnified view of point B;

[0022] Figure 7 It is a schematic diagram of the outer socket of the heat exchange tube and the connecting pipe sleeve;

[0023] Figure 8 It is a schematic diagram of the socket connection between the heat exchange tube and the connecting tube;

[0024] Fig. 9 A first schematic diagram of a connecting sleeve;

[0025] Fig.10 is a second schematic diagram of the connecting pipe sleeve;

[0026] Fig.11 This is a third schematic diagram of the connecting sleeve.

[0027] As shown in the figure: oven 1; preheating section 2; shaping section 3, 3A; heat recovery device 4, 4A, 4B; filter screen 6; base 7; heat exchanger 8, 8A; shell 9; tube sheet 10, 10A; metal thin tube 13; connecting pipe sleeve 14; inner wall surface 15; outer wall surface 16; outer convex edge 17; partition 18; pipe hole matching section 19; lifting frame 20; cold air inlet 21; hot air outlet 22; waste heat inlet 23; waste heat outlet 24; isolation device 25; dead point 26. DETAILED DESCRIPTION

[0028] Embodiment 1 of the present invention: A high-efficiency waste heat recovery shaping machine, such as Figures 1 to 3 As shown, it includes a plurality of oven sections, which are arranged in sequence from front to back. In this embodiment, there are 10 oven sections. An exhaust port is arranged on the oven 1. The oven sections 1 to 3 of the oven body are preheating sections 2 provided with air inlets. The oven sections 4 to 7 and the oven sections 8 to 10 are two connected shaping sections 3 and 3A. A heating device is arranged in the ovens of the shaping sections 3 and 3A. The heating device is a conventional radiator or burner for shaping machines. The exhaust port of the oven on the shaping section 3 is connected to and connected with a heat recovery device 4. The exhaust gas discharged from the oven on the shaping section 3 is discharged after heat exchange and cooling in the heat recovery device 4. The exhaust port of the oven on the shaping section 3A is connected to and connected with a heat recovery device 4A. The exhaust gas discharged from the oven on the shaping section 3A is discharged after heat exchange and cooling in the heat recovery device 4. The recovery device 4A is discharged after heat exchange and cooling, and the exhaust port of the oven of the preheating section 2 is connected and connected to the heat recovery device 4B. The exhaust gas discharged from the oven on the preheating section 2 is discharged after heat exchange and cooling by the heat recovery device 4B. The heat recovery device 4B is connected in series or in parallel with the heat recovery devices 4 and 4A and is connected to the upper air inlet of the oven of the preheating section 2. According to actual needs, the outside air can pass through one of the heat recovery devices 4, 4A, and 4B for one heat exchange and heating, or pass through two of them for two heat exchange and heating to enter the preheating section 2 for early hot air use, so as to replace the heating device. The temperature of the hot air entering the oven in front of the preheating section 2 is lower than the temperature of the hot air entering the rear oven, so that the oven in the preheating section 2 is gradually heated up. The specific connection method can be as follows Figure 1 As shown, the outside air can be heated once through the heat recovery device 4B, and then heat-exchanged twice through the heat recovery device 4 or the heat recovery device 4A, and then enter the first and second sections of the preheating section 2 respectively; Figure 2 As shown, the outside air enters the first section oven of the preheating section 2 after passing through the heat recovery device 4B for one heat exchange, and then enters the second section oven of the preheating section 2 after passing through the heat recovery device 4 and then the heat recovery device 4A for two heat exchanges; Figure 3As shown, the outside air enters the first section of the preheating section 2 after a heat exchange through the heat recovery device 4B, enters the second section of the preheating section 2 after heat exchange through the heat recovery device 4, and enters the third section of the preheating section 2 after heat exchange through the heat recovery device 4A. Since the hot air temperature in the shaping sections 3 and 3A is generally around 200°C, and the hot air temperature in the preheating section 2 is lower than 200°C, the outside air enters the preheating section 2 with a lower temperature after heat exchange and temperature rise, which is conducive to temperature stability. Because the outside air temperature after heat exchange with the heat recovery device 4B is lower than The outside air temperature after heat exchange with the heat recovery device 4, 4A is based on this feature. The heat recovery device 4B is connected in series or in parallel with the heat recovery device 4, 4A, so that the temperature of the hot air entering the oven in front of the preheating section 2 is lower than the temperature of the hot air entering the oven behind. While reducing the waste of heat emission, it can be used efficiently and flexibly. In addition, in order to reduce the heat loss of the pipeline, the distance between the exhaust pipes and the heating pipes connected is shortened as much as possible. The heat recovery devices 4, 4A, and 4B are arranged above or beside the corresponding shaping sections 3, 3A and the preheating section 2.

[0029] Furthermore, a detachable filter screen 6 is installed at the exhaust port of each oven 1 to perform preliminary filtering on the exhaust gas to reduce the risk of clogging of the heat exchanger.

[0030] Further Figures 4 to 6 As shown, the heat recovery devices 4, 4A, and 4B all include a base 7 and a plurality of heat exchangers 8 and 8A installed on the base 7. In this embodiment, there are two heat exchangers 8 and 8A, and the heat exchangers 8 and 8A all include an external shell 9 and a plurality of heat exchange tubes vertically installed in the shell 9. A channel for connecting the heat exchange tubes of the two heat exchangers 8 is provided in the base 7. A valve and an inspection port are provided on the base 7. When in use, the high-temperature exhaust gas enters the channel of the base 7 after passing through the heat exchange tube of the heat exchanger 8 and is then discharged from the heat exchange tube of the other heat exchanger 8A. The outside air exchanges heat with the high-temperature exhaust gas in the heat exchange tube in the shell 9, enters the heat exchanger 8 from the heat exchanger 8A to be heated, and then enters the preheating section 2 of the drying oven body. The heat exchange tube is vertically arranged. After cooling, the condensed water, dye and auxiliary organic matter in the exhaust gas will flow into the channel of the base 7 along the heat exchange tube. The condensed water can be discharged through the valve. To prevent the heat exchanger from being blocked, other impurities accumulated can be regularly cleaned through the inspection port.

[0031] Further, a group of tube sheets 10, 10A with tube holes evenly arranged are installed in the shell 9. The heat exchange tubes are installed between the tube sheets 10, 10A and are connected to the corresponding tube holes. The heat exchange tubes used in this embodiment are metal thin tubes 13 with a wall thickness of no more than 1 mm. The wall thickness of the metal thin tube 13 is preferably 0.2 mm to 0.5 mm. It can be made of stainless steel, copper, aluminum, titanium and other materials. Among them, the wall thickness of stainless steel material is best at 0.35 mm. Both ends of the metal thin tube 13 are plugged with connecting pipe sleeves 1 4. The connecting sleeves 14 at both ends are welded or fixed to the corresponding tube holes of the tube sheets 10 and 10A by expansion joints with a tube expander. The use of the metal thin tube 13 has a lower material cost. At the same time, the heat exchange area per unit cross-sectional area is increased, thereby improving the heat exchange efficiency. Since the two ends are installed by plugging with the connecting sleeves 14 fixed to the corresponding tube holes of the corresponding tube sheets by welding or expansion joints with a tube expander, the metal thin tube 13 will not be burned through or cracked because it is not directly welded or expanded by a tube expander.

[0032] As a preferred embodiment, Figures 7 and 8 As shown, after the connecting sleeve 14 is fixed on the tube sheet 10, 10A, its connection end with the metal thin tube 13 is located on the inner side of the tube sheet 10, 10A, and the connecting sleeve 14 exceeds a certain length of the inner side of the tube sheet 10, 10A. The metal thin tube 13 can be connected with the inner or outer socket of the tube as needed, and the connection is more flexible.

[0033] As a preferred embodiment, the inner wall surface 15 and the outer wall surface 16 of the connecting end of the connecting sleeve 14 and the metal thin tube 13 are both guide cone surfaces, which can be as follows: Fig. 9 As shown, its outer wall surface 16 is a guide cone surface; Fig.10 As shown, the inner wall surface 15 is a guide cone surface; Fig.11 As shown, the inner wall surface 15 and the outer wall surface 16 are both guide cone surfaces, which play a guiding role when the metal thin tube 13 is connected with the inner or outer socket, and are convenient for alignment and connection. In the printing and dyeing industry, air-to-air heat exchange is basically carried out, and high sealing is not required. Therefore, the connecting pipe sleeve 14 and the metal thin tube 13 can be directly plugged in. Of course, in order to improve its sealing, adhesive can also be used at the connection between the two.

[0034] As a preferred embodiment, the other end of the connecting sleeve 14 includes an outer convex edge 17, and the middle section of the connecting sleeve 14 is a tube hole matching section 19, and a stepped stop point 26 is formed between the tube hole matching section 19 and the guide cone surface. When the connecting sleeve 14 is connected to the tube hole of the tube sheet 10, 10A through the middle tube hole matching section 19, the outer convex edge 17 and the outer side of the tube sheet 10, 10A are limited and stopped. The stop point 26 can stop the metal thin tube 13, so that the connecting sleeve 14 can be placed at a specific position of the tube hole on the tube sheet 10, 10A, which is convenient for the precise placement of the connecting sleeve 14 for subsequent welding or expansion and fixation by a tube expander.

[0035] As a preferred embodiment, the metal thin tube 13 is a spiral tube with extruded inner and outer walls; the tube wall is formed into a spiral by extrusion, and both ends of the spiral tube are connected with spiral extrusion, which is convenient for close connection with the connecting tube sleeve 14 or the tube holes of the tube plate 10, 10A. The use of the spiral tube can increase the heat exchange area on the one hand, and cause disturbance when the medium passes through, generating a rotating circulation, and further improving the heat exchange efficiency of the two media inside and outside the tube.

[0036] As a preferred embodiment, a plurality of partitions 18 located between the metal thin tubes 13 are installed in the shell 9. The plurality of partitions 18 guide the medium located outside the metal thin tubes 13 to make it serpentine-shaped, thereby extending the distance and time of heat exchange of the medium in the heat exchanger and improving the heat exchange efficiency. At the same time, the partitions 18 also reinforce the heat exchange tubes. In particular, the metal thin tubes 13 are easily deformed due to their thin tube walls, and are reinforced by the partitions 18 to increase their anti-deformation ability.

[0037] As a preferred embodiment, a heat recovery device 4B or a heat recovery device 4 or 4A includes a lifting frame 20 that can be raised and lowered, and includes a base 7 and a plurality of heat exchange bodies 8, 8A installed on the base 7. The heat recovery devices 4B or the heat recovery devices 4 or 4A are all integrally provided with a cold air inlet 21, a hot air outlet 22, a waste heat inlet 23, and a waste heat outlet 24. The cold air inlet 21, the hot air outlet 22, the waste heat inlet 23, and the waste heat outlet 24 are respectively flexibly connected with ventilation ducts. The ventilation ducts are installed on the lifting frame 20. By lifting and lowering the lifting frame 20, each ventilation duct can be moved up and down for easy disassembly and assembly with the heat recovery device 4B or the heat recovery device 4 or 4A, so as to facilitate replacement and cleaning of the heat recovery device 4B or the heat recovery device 4 or 4A.

[0038] The heat recovery device 4, 4A, 4B further comprises a lifting frame 20 which can be raised and lowered, and the heat recovery device 4, 4A, 4B comprises a waste heat inlet 23, a waste heat outlet 24, a cold air inlet 21, and a hot air outlet 22. The lifting frame 20 is connected with a ventilation pipe which is connected with the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21, and the hot air outlet 22. The ventilation pipe comprises a soft connection section. The exhaust gas enters from the waste heat inlet 23, is cooled by heat exchange, and is discharged from the waste heat outlet 24. The outside air enters from the cold air inlet 21, is heated by heat exchange, and is discharged from the hot air outlet 24. The outlet 22 enters the preheating section 2 oven, wherein a section of the ventilation duct is a retractable threaded tube as the soft connection section, and the ports of the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21, and the hot air outlet 22 are provided with matching joints at the ends of the corresponding ventilation ducts. The ventilation duct provided with the soft connection section can be retracted to be connected and disassembled with the waste heat inlet 23, the waste heat outlet 24, the cold air inlet 21, and the hot air outlet 22 through the lifting frame 20. It is convenient for the heat recovery devices 4, 4A, and 4B to be disassembled, replaced, and cleaned.

[0039] As a preferred embodiment, Figure 3As shown, an isolation device 25 is provided between the preheating section 2 and the adjacent shaping section 3 or between the ovens adjacent to the preheating section 2. The isolation device 25 separates the upper and lower spaces of the ovens except for the cloth running space. Since the temperature of the shaping sections 3 and 3A is high and the temperature in the preheating section 2 is relatively low, the isolation device 25 is provided to reduce the heat flow from the shaping sections 3 and 3A to the preheating section 2, so as to improve the shaping efficiency.

[0040] The second embodiment of the present invention is different from the first embodiment in that the heat exchange tube part of the heat exchange body is a metal thick tube with a wall thickness of not less than 1.5 mm, and the two ends are directly welded or fixed to the corresponding tube holes of the tube sheets 10 and 10A by expansion joints with a tube expander. Since the number of heat exchange tubes in the heat exchanger usually reaches dozens or even hundreds, the tube sheets 10 and 10A are covered with tube holes. If the tube sheets 10 and 10A are not supported, they will be deformed due to insufficient strength. If all the heat exchange tubes used are metal thin tubes 13, they are only plugged and installed between the tube sheets 10 and 10A with the connecting pipe sleeves 14 and they themselves The strength is not enough, so it cannot play a supporting role. By using thick metal tubes with a wall thickness of not less than 1.5 mm for some heat exchange tubes, and the thick metal tubes are expanded and fixed to the corresponding tube holes of the tube sheets 10 and 10A through a tube expander, the purpose of supporting the tube sheets 10 and 10A so that they will not be deformed can be achieved. The number of thick metal tubes does not need to be large and the number and connection positions can be selected according to actual needs. For example, if there are 100 heat exchange tubes in total, 4 thick metal tubes and 96 thin metal tubes can be used. The 4 thick metal tubes are installed at the four corners of the tube sheets 10 and 10A. The remaining structure is the same as that of the first embodiment and will not be repeated.

[0041] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A high-efficiency waste heat recovery setting machine, comprising a drying oven body composed of multiple drying ovens arranged in sequence from front to back, with an exhaust port provided on the drying oven, characterized in that: It includes several heat recovery devices connected in series or in parallel. The first three ovens of the oven body are preheating sections with air inlets. The remaining ovens are divided into several connected shaping sections from front to back. Each shaping section includes one to several ovens. The exhaust ports of the ovens on each shaping section are connected and connected to a corresponding heat recovery device. The tail gas discharged from the ovens on the shaping section enters the corresponding heat recovery device for heat exchange and cooling before being discharged. The exhaust ports of the ovens in the preheating section are also connected and connected to a corresponding heat recovery device. The tail gas discharged from the ovens on the preheating section enters the corresponding heat recovery device for heat exchange and cooling before being discharged. The outside air enters the ovens in the preheating section after heat exchange and heating through one or more heat recovery devices. , and the outside air passing through the heat recovery device connected to the exhaust port of the oven in the preheating section is connected to the oven in front of the preheating section, and the outside air passing through the heat recovery device connected to the oven in the shaping section is connected to the oven behind the preheating section; the heat recovery devices each include a base and a plurality of heat exchange bodies installed on the base, and the plurality of heat exchange bodies each include an external shell and a plurality of heat exchange tubes vertically installed in the shell, and the base is provided with a channel connecting the plurality of heat exchange bodies; a group of tube sheets with tube holes evenly arranged are installed in the shell of the heat exchange body, and a plurality of heat exchange tubes are installed between the two tube sheets and are connected to the corresponding tube holes respectively, and some or all of the heat exchange tubes have a wall thickness of not more than 1 mm thin metal tube, both ends of which are plugged with connecting sleeves, which are welded or fixed to the corresponding tube holes of the corresponding tube sheet by expansion by a tube expander. The thin metal tube will not be burned through or cracked because it is not directly welded or expanded by a tube expander. A plurality of partitions located between the thin metal tubes are installed in the shell, and the plurality of partitions guide the medium outside the thin metal tube to make it convey in a serpentine manner. After the connecting pipe sleeve is fixed on the tube sheet, the connecting end with the metal thin tube is located on the inner side of the tube sheet, and the metal thin tube is connected with the inner or outer socket of the tube; The connecting surface where the connecting pipe sleeve and the metal thin pipe are plugged and matched is a guiding cone surface; The other end of the connecting pipe sleeve comprises an outer convex edge, and when the connecting pipe sleeve is inserted into the tube hole of the tube sheet, the outer convex edge and the outer side of the tube sheet are limited and stopped.

2. The high-efficiency waste heat recovery shaping machine according to claim 1 is characterized in that: Part of the heat exchange tubes are thick metal tubes with a wall thickness of not less than 1.5 mm. Both ends of the thick metal tubes are welded or expanded and fixed to the corresponding tube holes of the corresponding tube sheets by a tube expander to serve as support between the tube sheets.

3. The high-efficiency waste heat recovery shaping machine according to claim 1 or 2, characterized in that: The heat exchange tube is a spiral tube with extruded inner and outer walls, and both ends of the spiral tube are connection ends without spiral extrusion.

4. The high-efficiency waste heat recovery shaping machine according to claim 1 is characterized in that: It comprises a lifting frame which can be raised and lowered and adjusted, the heat recovery device comprises a waste heat inlet, a waste heat outlet, a cold air inlet and a hot air outlet, the lifting frame is connected with a ventilation pipe which is in communication with the waste heat inlet, the waste heat outlet, the cold air inlet and the hot air outlet, and the ventilation pipe comprises a soft connection section.

5. The high-efficiency waste heat recovery shaping machine according to claim 1 is characterized in that: An isolation device is arranged between the preheating section and the adjacent shaping section, and the isolation device separates the upper and lower spaces of the oven except for the cloth feeding space.

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