A waste heat recovery device for a hot air penetration dryer

Abstract

The present invention relates to the technical field of drying machines, and particularly relates to a waste heat recovery device for a hot air penetration type drying machine, including a base. A heat recovery mechanism is provided at the center of the top of the base. A feeding mechanism is provided outside the heat recovery mechanism. A hot air blower is provided at the top of the heat recovery mechanism. The heat recovery mechanism includes a machine body fixedly connected to the top of the base. A feed inlet is horizontally penetrated through the side wall of the machine body. An anti-blocking mechanism is provided at the inner top of the machine body. Through the heat recovery mechanism, the present invention effectively recovers the heat scattered during the drying process of the fabric. At the same time, the thermal driving mechanism inside the heat recovery mechanism is used to drive the anti-blocking mechanism to open, effectively knocking down the adhered dust on the ventilation net cover, achieving the effect of using the waste heat during the fabric drying process to drive the knocking down of the adhered dust on the ventilation net cover, effectively improving the utilization rate of the heat in the drying machine and reducing the waste of heat energy.

Description

Technical Field

[0001] The present invention relates to the technical field of drying machines, and particularly relates to a waste heat recovery device for a hot air penetration type drying machine. Background Art

[0002] The hot air penetration type drying machine is a common thermal device for drying fabrics, which is widely used in the textile production. It achieves the effect of rapid drying of fabrics by penetrating the fabrics with hot air.

[0003] When the existing hot air penetration type drying machine dries fabrics, the hot air from the hot air outlet directly impacts on the surface of the fabrics. The thickness of the fabrics directly determines the passing rate of the hot air. When the fabrics are thick, part of the hot air impacts on the surface of the fabrics and passes through, and the remaining hot air that does not pass through the fabrics scatters along the surface of the fabrics. During this period, when the hot air impacts on the thick fabrics, the hot air scatters inside the machine body and is finally discharged outside the machine body, resulting in low heat utilization rate and waste of heat energy. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a waste heat recovery device for a hot air penetration type drying machine, which solves the technical problems of low heat utilization rate and waste of heat energy after the hot air passes through the fabrics.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A waste heat recovery device for a hot air penetration type drying machine, including a base. A heat recovery mechanism is provided at the center of the top of the base. A feeding mechanism is provided outside the heat recovery mechanism. A hot air blower is provided on the top of the heat recovery mechanism.

[0006] The heat recovery mechanism includes a machine body fixedly connected to the top of the base. A feeding port is horizontally penetrated through the side wall of the machine body. An anti-blocking mechanism is provided at the inner top of the machine body. A thermal driving mechanism is provided inside the machine body. A hot air guiding mechanism is provided at the center of the bottom of the anti-blocking mechanism. A conical guide cylinder is provided between the thermal driving mechanism and the hot air guiding mechanism.

[0007] The anti-blocking mechanism includes a ventilation mesh cover provided at the center of the top wall of the machine body. An installation sleeve is fixedly connected to the outside of the ventilation mesh cover. The conical guide cylinder is fixedly connected to the bottom wall of the installation sleeve. The front and rear side walls of the outside of the installation sleeve are both fixedly connected with rotating shafts. The other ends of the rotating shafts are rotatably installed on the inner wall of the machine body. Fixed plates are symmetrically fixedly connected to both sides of the rotating shafts.

[0008] A plurality of limiting plates are fixedly installed on the arc-shaped bottom wall of the fixed plate. Support rods are fixedly connected to the inner side walls of the fixed plates. Connecting arms are fixedly connected to the inner ends of the support rods. Knocking rods are symmetrically fixedly installed on the inner side walls of the connecting arms. The knocking rods are respectively located on both sides of the installation sleeve. Arc-shaped top blocks are symmetrically fixedly installed on the bottom walls of the limiting plates.

[0009] Preferably, the thermal driving mechanism includes a hot air duct fixedly connected to the inner side wall of the machine body. The hot air duct is arranged as a conical tube and is annularly and dispersedly arranged outside the conical guide cylinder. A rotating plate is rotatably installed at the top of each hot air duct. Symmetrically fixed bumps are fixedly connected to the top of the rotating plate. A rotating rod is fixedly connected to the bottom of the rotating plate. Multiple groups of impellers are fixedly connected to the outer side of the rotating rod, and the impellers gradually increase from top to bottom in the longitudinal direction.

[0010] Preferably, a supporting top rod is fixedly connected to the center of the bottom wall of the ventilation mesh cover. A limiting ring is sleeved on the outer side of the supporting top rod, and an elastic wind-catching film is fixedly connected to the bottom of the limiting ring;

[0011] The hot air guiding mechanism includes an elastic positioning sleeve arranged directly below the conical guide cylinder. A plurality of magnetic sliding sleeves are fixedly connected to the outer side wall of the elastic positioning sleeve. The magnetic sliding sleeves are equidistantly arranged along the circumferential direction of the elastic positioning sleeve. A sliding rod is slidably sleeved on the outer side of each magnetic sliding sleeve, and an electromagnetic positioning ring is fixedly connected to the outer end of the sliding rod;

[0012] A spring is fixedly connected to the inner side of the magnetic sliding sleeve, and the other end of the spring is fixedly connected to the side wall of the supporting top rod. The end of the bottom wall of the elastic wind-catching film is fixedly connected to the top wall of the elastic positioning sleeve.

[0013] Preferably, the feeding mechanism includes two first mounting frames fixedly connected to the left side of the top wall of the base. A conveying roller is rotatably installed inside the first mounting frame, and a feeding roller is arranged on the left side of the first mounting frame;

[0014] Second mounting frames are symmetrically fixedly connected to the right side of the top wall of the base. A winding roller is rotatably installed inside the second mounting frame. A fabric body is sleeved on the winding roller, and the other side of the fabric body passes through the feeding port and is sleeved on the feeding roller.

[0015] By means of the above technical solution, the present invention provides a waste heat recovery device for a hot air penetration dryer, which at least has the following beneficial effects:

[0016] 1. The present invention effectively recovers the heat scattered during the fabric drying process through the heat recovery mechanism, and at the same time, the thermal driving mechanism inside the heat recovery mechanism is used to drive the anti-blocking mechanism to open, so as to effectively knock down the adhered dust on the ventilation mesh cover, achieving the effect of using the waste heat during the fabric drying process to drive the knocking down of the attached dust on the ventilation mesh cover, effectively improving the utilization rate of the heat in the dryer and reducing the waste of heat energy.

[0017] 2. In the present invention, the drying hot air passes through the gap between the conical diversion cylinder and the elastic air-catching film to achieve full contact with the fabric. At the same time, after the hot air flow impacts the surface of the fabric, it scatters along the bottom of the conical diversion cylinder, driving the continuous rotation of the impeller inside the hot air duct. Meanwhile, through the cooperative setting among the rotating plate, the limiting convex block, the limiting plate, and the arc-shaped top block, the fixed plate and the knocking rod finally achieve the effect of continuously vibrating and knocking the mounting sleeve, achieving the effect of automatically cleaning the adhered dust on the surface of the ventilation grille.

[0018] 3. In the present invention, the conical diversion cylinder and the conically arranged hot air duct are used to longitudinally divert the hot air that impacts the surface of the fabric. The hot air with the residual heat of drying is used to drive the continuous rotation of the impeller, and then drive the continuous operation of the anti-blocking mechanism. Using the residual heat of fabric drying as the power source greatly reduces the phenomenon that dust is likely to accumulate on the ventilation grille in a high-temperature environment, achieving the recycling of the residual heat of drying and improving the heat utilization rate.

[0019] 4. In the present invention, the hot air guiding mechanism is used to uniformly dry fabrics with different thicknesses. At the same time, through the cooperative setting among the electromagnetic positioning ring, the magnetic sliding sleeve, the elastic positioning sleeve, and the elastic air-catching film, the applicability adjustment of the amplitude and rate of the hot air impacting the fabric during the drying process of fabrics with different thicknesses is realized, greatly enhancing the versatility of fabric drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is a three-dimensional structural schematic diagram inside the heat recovery mechanism of the present invention;

[0023] Figure 3 is a three-dimensional structural schematic diagram of the anti-blocking mechanism of the present invention;

[0024] Figure 4 is a rear three-dimensional structural schematic diagram of the anti-blocking mechanism of the present invention;

[0025] Figure 5 is a structural schematic diagram of the thermal drive mechanism of the present invention;

[0026] Figure 6 is a three-dimensional sectional structural schematic diagram inside the thermal drive mechanism of the present invention;

[0027] Figure 7 is a structural schematic diagram of the internal state before the hot air guiding mechanism of the present invention is opened;

[0028] Figure 8 Schematic diagram of the internal state structure after the hot air guiding mechanism of the present invention is opened;

[0029] Figure 9 Schematic three-dimensional structure diagram of the hot air guiding mechanism of the present invention;

[0030] Figure 10 Schematic top view of the internal structure of the hot air guiding mechanism of the present invention.

[0031] In the figure: 1, base; 2, heat recovery mechanism; 20, body; 21, feed inlet; 22, anti-blocking mechanism; 220, ventilation net cover; 221, mounting sleeve; 222, rotating shaft; 223, fixing plate; 224, limiting plate; 225, support rod; 226, connecting arm; 227, knocking rod; 228, arc-shaped top block; 23, thermal driving mechanism; 230, hot air duct; 231, rotating plate; 232, limiting convex block; 233, rotating rod; 234, impeller; 24, conical flow guide cylinder; 25, hot air guiding mechanism; 250, elastic positioning sleeve; 251, magnetic sliding sleeve; 252, sliding rod; 253, electromagnetic positioning ring; 254, spring; 26, support top rod; 27, limiting ring; 28, elastic air pocket film; 3, feeding mechanism; 30, first mounting frame; 31, loading roller; 32, conveying roller; 33, fabric body; 34, second mounting frame; 35, winding roller; 4, hot air blower. Specific embodiments

[0032] 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.

[0033] Embodiment 1

[0034] Please refer to Figures 1-4 , a waste heat recovery device for a hot air penetration dryer, including a base 1, a heat recovery mechanism 2 is provided at the center of the top of the base 1, a feeding mechanism 3 is provided outside the heat recovery mechanism 2, and a hot air blower 4 is provided on the top of the heat recovery mechanism 2;

[0035] The heat recovery mechanism 2 includes a body 20 fixedly connected to the top of the base 1. A feed port 21 is horizontally penetrated through the side wall of the body 20. An anti-blocking mechanism 22 is provided at the inner top of the body 20. A thermal driving mechanism 23 is provided inside the body 20. A hot air guiding mechanism 25 is provided at the center of the bottom of the anti-blocking mechanism 22. A conical guiding cylinder 24 is provided between the thermal driving mechanism 23 and the hot air guiding mechanism 25. Through the heat recovery mechanism 2, the heat scattered during the drying process of the fabric can be effectively recovered. At the same time, the thermal driving mechanism 23 inside the heat recovery mechanism 2 is used to drive the anti-blocking mechanism 22 to open, so as to effectively knock down the dust adhered to the ventilation mesh cover 220, achieving the effect of using the waste heat during the fabric drying process to drive the dust attached to the ventilation mesh cover 220 to be knocked down, effectively improving the utilization rate of the heat in the dryer and reducing the waste of thermal energy;

[0036] The anti-blocking mechanism 22 includes a ventilation mesh cover 220 provided at the center of the top wall of the body 20. An installation sleeve 221 is fixedly connected to the outside of the ventilation mesh cover 220. The conical guiding cylinder 24 is fixedly connected to the bottom wall of the installation sleeve 221. The front and rear side walls of the outside of the installation sleeve 221 are fixedly connected with rotating shafts 222. The other ends of the rotating shafts 222 are rotatably installed on the inner wall of the body 20. Fixed plates 223 are symmetrically and fixedly connected to both sides of the rotating shafts 222;

[0037] A plurality of limiting plates 224 are fixedly installed on the arc-shaped bottom wall of the fixed plate 223. Support rods 225 are fixedly connected to the inner side walls of the fixed plates 223. Connecting arms 226 are fixedly connected to the inner ends of the support rods 225. Knocking rods 227 are symmetrically and fixedly installed on the inner side walls of the connecting arms 226. The knocking rods 227 are respectively located on both sides of the installation sleeve 221. Arc-shaped top blocks 228 are symmetrically and fixedly installed on the bottom walls of the limiting plates 224. When the hot air inside the thermal driving mechanism 23 drives the rotating plate 231 to rotate, it drives the limiting convex blocks 232 to continuously contact the arc-shaped top blocks 228 at the bottom of the limiting plates 224. Each time they contact during the rotation process, it drives the limiting plates 224 to move upward, so that the fixed plates 223 rotate along the rotating shafts 222, and then the knocking rods 227 continuously hit the side wall of the installation sleeve 221, thereby realizing the knocking of the installation sleeve 221 and the ventilation mesh cover 220, effectively knocking down the dust accumulated on the surface of the ventilation mesh cover 220 during the drying process, so as to effectively utilize the drying waste heat and greatly enhance the heat utilization rate during the fabric drying process.

[0038] Embodiment 2

[0039] Please refer to Figures 2-6 , this embodiment is basically the same as Embodiment 1. This embodiment is made on the basis of Embodiment 1 and has the same beneficial effects as Embodiment 1. For the same parts, please refer to each other and will not be elaborated in detail here.

[0040] The thermal driving mechanism 23 includes a hot air duct 230 fixedly connected to the inner side wall of the machine body 20. The hot air duct 230 is arranged as a conical tube. The conical arrangement of the hot air duct 230 enables the hot air to move upward longitudinally inside the hot air duct 230, and the passing space continuously shrinks, thereby enhancing the flow rate of the hot air at the top and increasing the rotational speed of each impeller 234. The hot air ducts 230 are annularly and dispersedly arranged outside the conical guide cylinder 24. Rotating plates 231 are rotatably installed at the tops of the hot air ducts 230. Symmetrically fixed bumps 232 are fixedly connected to the tops of the rotating plates 231. A rotating rod 233 is fixedly connected to the bottom of the rotating plate 231. Multiple groups of impellers 234 are fixedly connected to the outer side of the rotating rod 233. The impellers 234 gradually increase from top to bottom longitudinally. When the hot air impacts the surface of the fabric from top to bottom, it scatters along the surface of the fabric and enters the hot air duct 230 when the hot air moves upward at this time. In this way, the impellers 234 are driven to rotate, and then the rotating rod 233 and the rotating plate 231 are driven to rotate. The drying hot air fully contacts the fabric by passing through the gap between the conical guide cylinder 24 and the elastic air-catching film 28. At the same time, after the hot air flow impacts the surface of the fabric, it scatters along the bottom of the conical guide cylinder 24, driving the continuous rotation of the impellers 234 inside the hot air duct 230. At the same time, through the cooperative setting among the rotating plate 231, the limiting bump 232, the limiting plate 224, and the arc-shaped top block 228, the effect that the fixing plate 223 and the knocking rod 227 continuously vibrate and knock the mounting sleeve 221 is finally achieved, and the effect of automatically cleaning the adhered dust on the surface of the ventilation grille 220 is achieved.

[0041] As a preferred technical solution of this embodiment, a gap is left between the bottom wall of the limiting plate 224 and the top wall of the rotating plate 231 to ensure that the arc-shaped top block 228 contacts the limiting bump 232 when the rotating plate 231 rotates. The arc-shaped top block 228 and the limiting bump 232 are arranged in a mutually staggered manner, ensuring that the limiting bump 232 intermittently contacts the arc-shaped top block 228 when the rotating plate 231 continuously rotates, thereby realizing the continuous lifting of each limiting plate 224.

[0042] Embodiment III

[0043] Please refer to Figures 7-10 , this embodiment is basically the same as Embodiment I. This embodiment is made on the basis of Embodiment I and has the same beneficial effects as Embodiment I. For the same parts, please refer to each other and will not be elaborated in detail here.

[0044] A support top rod 26 is fixedly connected to the center of the bottom wall of the ventilation grille 220. A limiting ring 27 is sleeved on the outer side of the support top rod 26. An elastic air-catching film 28 is fixedly connected to the bottom of the limiting ring 27. When the hot air generated by the hot air blower 4 passes through the ventilation grille 220, the hot air passes through the gap between the elastic air-catching film 28 and the conical guide cylinder 24, thereby realizing the four-way equal distribution of the hot air along the elastic air-catching film 28.

[0045] As a preferred technical solution of this embodiment, the hot air guiding mechanism 25 includes an elastic positioning sleeve 250 disposed directly below the conical guiding cylinder 24. A plurality of magnetic sliding sleeves 251 are fixedly connected to the outer side wall of the elastic positioning sleeve 250. The magnetic sliding sleeves 251 are equally spaced along the circumferential direction of the elastic positioning sleeve 250. A sliding rod 252 is slidably sleeved on the outer side of each magnetic sliding sleeve 251. An electromagnetic positioning ring 253 is fixedly connected to the outer end of the sliding rod 252. When the fabric is thick, in order to ensure the drying effect, it is necessary to increase the drying duration, and correspondingly, more dust accumulates on the surface area of the ventilation grille 220. At this time, the electromagnetic positioning ring 253 is turned on. Under the action of the electromagnetic adsorption force, the magnetic sliding sleeve 251 slides outward, thereby driving the elastic air pocket film 28 to expand as shown in Figures 7 to 8 Figure [not shown]. At this time, the space between the elastic air pocket film 28 and the conical guiding cylinder 24 is further reduced. At this time, the flow rate of the hot air scattered through the fabric surface is accelerated, so that the flow rate of the hot air in the hot air duct 230 inside the thermal driving mechanism 23 is further increased. At this time, the rotation speed of the impeller 234 increases, and the corresponding hitting amplitude is enhanced. Thus, the applicability of knocking down the accumulated dust during the drying process of fabrics with different thicknesses is realized;

[0046] As a preferred technical solution of this embodiment, a spring 254 is fixedly connected to the inner side of the magnetic sliding sleeve 251. The other end of the spring 254 is fixedly connected to the side wall of the support top rod 26. The bottom wall end of the elastic air pocket film 28 is fixedly connected to the top wall of the elastic positioning sleeve 250. After the electromagnetic positioning ring 253 is turned on, under the action of the electromagnetic adsorption force, the magnetic sliding sleeve 251 slides outward along the sliding rod 252, and the spring 254 extends. At this time, the elastic air pocket film 28 expands, thereby reducing the hot air passage space, enhancing the knocking amplitude on the ventilation grille 220, realizing uniform drying of fabrics with different thicknesses through the hot air guiding mechanism 25. At the same time, through the cooperative setting among the electromagnetic positioning ring 253, the magnetic sliding sleeve 251, the elastic positioning sleeve 250 and the elastic air pocket film 28, the applicability adjustment of the hot air impact amplitude rate on the fabric during the drying process of fabrics with different thicknesses is realized, greatly enhancing the versatility of fabric drying.

[0047] Embodiment Four

[0048] Please refer to Figures 1-2 Figure [not shown]. This embodiment is basically the same as Embodiment One. This embodiment is made on the basis of Embodiment One and has the same beneficial effects as Embodiment One. For the same parts, please refer to each other and will not be elaborated in detail here.

[0049] The feeding mechanism 3 includes two first mounting frames 30 fixedly connected to the left side of the top wall of the base 1. A conveying roller 32 is rotatably mounted inside the first mounting frame 30. A loading roller 31 is provided on the left side of the first mounting frame 30.

[0050] As a preferred technical solution of this embodiment, the right side of the top wall of the base 1 is symmetrically and fixedly connected with a second mounting bracket 34. A winding roller 35 is rotatably mounted inside the second mounting bracket 34. A motor for driving the winding roller 35 to rotate is provided outside the winding roller 35. By using the motor to drive the winding roller 35 to rotate, the lateral transportation of the fabric body 33 is realized. The fabric body 33 is sleeved on the winding roller 35. The other side of the fabric body 33 passes through the feeding port 21 horizontally and is sleeved on the loading roller 31. Before the drying starts, the fabric body 33 is taken off from the loading roller 31, passes through the feeding port 21, and is sleeved on the winding roller 35. Then, the hot air blower 4 is turned on to realize the drying of the fabric body 33 during the lateral transportation process.

[0051] The control mode of the present invention is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming of those skilled in the art. The provision of the power supply also belongs to the common knowledge in the art. And the present invention mainly aims to protect mechanical devices, so the control mode and circuit connection of the present invention will not be explained in detail.

[0052] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0053] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the above embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, please refer to the partial description of the method embodiments.

[0054] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for a hot air penetration dryer, comprising a base (1), characterized in that: At the center of the top of the base (1), there is a heat recovery mechanism (2). On the outside of the heat recovery mechanism (2), there is a feeding mechanism (3). On the top of the heat recovery mechanism (2), there is a hot air blower (4). The heat recovery mechanism (2) includes a body (20) fixedly connected to the top of the base (1). A feed inlet (21) is horizontally penetrated through the side wall of the body (20). An anti-blocking mechanism (22) is provided at the inner top of the body (20). A thermal driving mechanism (23) is provided inside the body (20). At the center of the bottom of the anti-blocking mechanism (22), there is a hot air guiding mechanism (25). A conical guiding cylinder (24) is provided between the thermal driving mechanism (23) and the hot air guiding mechanism (25). The anti-blocking mechanism (22) includes a ventilation mesh cover (220) arranged at the center of the top wall of the body (20). An installation sleeve (221) is fixedly connected to the outside of the ventilation mesh cover (220). The conical guiding cylinder (24) is fixedly connected to the bottom wall of the installation sleeve (221). The front and rear side walls of the outside of the installation sleeve (221) are fixedly connected with rotating shafts (222). The other ends of the rotating shafts (222) are rotatably installed on the inner wall of the body (20). On both sides of the rotating shafts (222), there are symmetrically fixedly connected with fixing plates (223). A plurality of limiting plates (224) are fixedly installed on the arc-shaped bottom wall of the fixing plate (223). Strut rods (225) are fixedly connected to the inner side walls of the fixing plates (223). The inner ends of the strut rods (225) are fixedly connected with connecting arms (226). On the inner side walls of the connecting arms (226), there are symmetrically fixedly installed with knocking rods (227). The knocking rods (227) are respectively located on both sides of the installation sleeve (221). Arc-shaped top blocks (228) are symmetrically fixedly installed on the bottom walls of the limiting plates (224). The thermal driving mechanism (23) includes a hot air duct (230) fixedly connected to the inner side wall of the body (20). The hot air duct (230) is a conical pipe and is annularly and dispersedly arranged on the outside of the conical guiding cylinder (24). Rotating plates (231) are rotatably installed on the tops of the hot air ducts (230). Limiting convex blocks (232) are symmetrically fixedly connected to the tops of the rotating plates (231). A rotating rod (233) is fixedly connected to the bottom of the rotating plate (231). A plurality of groups of impellers (234) are fixedly connected to the outside of the rotating rod (233). The impellers (234) gradually increase from top to bottom in the longitudinal direction. A support top rod (26) is fixedly connected to the center of the bottom wall of the ventilation mesh cover (220). A limiting ring (27) is sleeved on the outside of the support top rod (26). An elastic air-catching film (28) is fixedly connected to the bottom of the limiting ring (27). The hot air guiding mechanism (25) includes an elastic positioning sleeve (250) arranged directly below the conical guide cylinder (24). A plurality of magnetic sliding sleeves (251) are fixedly connected to the outer side wall of the elastic positioning sleeve (250). The magnetic sliding sleeves (251) are equidistantly arranged along the circumferential direction of the elastic positioning sleeve (250). A sliding rod (252) is slidably sleeved on the outer side of each magnetic sliding sleeve (251), and an electromagnetic positioning ring (253) is fixedly connected to the outer end of the sliding rod (252).

2. The waste heat recovery device for a hot air penetration dryer according to claim 1, characterized in that: A spring (254) is fixedly connected to the inner side of the magnetic sliding sleeve (251). The other end of the spring (254) is fixedly connected to the side wall of the supporting ejector rod (26). The bottom wall end of the elastic wind-catching film (28) is fixedly connected to the top wall of the elastic positioning sleeve (250).

3. The waste heat recovery device for a hot air penetration dryer according to claim 1, characterized in that: The feeding mechanism (3) includes two first mounting frames (30) fixedly connected to the left side of the top wall of the base (1). A conveying roller (32) is rotatably mounted inside the first mounting frame (30). A loading roller (31) is arranged on the left side of the first mounting frame (30).

4. The waste heat recovery device for a hot air penetration dryer according to claim 3, characterized in that: On the right side of the top wall of the base (1), second mounting frames (34) are symmetrically and fixedly connected. A winding roller (35) is rotatably mounted inside the second mounting frame (34). A fabric body (33) is sleeved on the winding roller (35). The other side of the fabric body (33) passes through the feeding port (21) and is sleeved on the loading roller (31).

5. The waste heat recovery device for a hot air penetration dryer according to claim 1, characterized in that: A gap is left between the bottom wall of the limiting plate (224) and the top wall of the rotating plate (231). The arc-shaped top block (228) and the limiting convex block (232) are arranged in a mutually staggered manner.

Images