Waste heat drying machine with hot water recovery function

Abstract

The invention relates to the technical field of suction dryers, in particular to a waste heat suction dryer with hot water recovery, which comprises a primary cooler, a hot water recovery heat exchanger, an auxiliary electric heater, a secondary cooler, an adsorption tower A and an adsorption tower B which are arranged on the surface of a suction dryer body, the device has the beneficial effects that the drying agent is regenerated by waste heat generated in the compression process of the compressor in the drying machine body, compressed air is not consumed in the heating regeneration process, the energy consumption of the whole adsorption and regeneration process is close to zero, and meanwhile, high-temperature heat of the compressed air is fully utilized to directly enter the regeneration adsorption layer; and the high-temperature heat is absorbed by the adsorbent, so that the heat load of the rear primary cooler is reduced, the consumption of cooling water is correspondingly reduced, the compression heat has an energy-saving characteristic, and effective energy conservation can be realized to the greatest extent.

Description

Technical Field

[0001] The invention relates to the field of desiccant machines, in particular to a desiccant machine with hot water recovery function. Background Art

[0002] A desiccant dryer is a device used for drying compressed air. It uses desiccants (such as silica gel, molecular sieves, etc.) to absorb moisture in the compressed air to achieve the purpose of drying. Compared with a cold dryer, a desiccant dryer can provide a lower dew point temperature and is suitable for occasions with higher requirements on compressed air quality.

[0003] At present, the domestic waste heat regeneration dryer is composed of an adsorption tower, a cooling system, valves, connecting pipes, a dust removal filter, a control system, a frame, etc. However, the traditional waste heat dryer mainly uses high-temperature gas to deeply regenerate the adsorbent, and the other heat is taken away by the cooling water, resulting in heat energy waste and complicated operation.

[0004] To this end, the present invention proposes a waste heat absorption dryer with hot water recovery to solve the above-mentioned technical problems. Summary of the invention

[0005] The object of the present invention is to provide a waste heat absorption dryer with hot water recovery to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a waste heat absorption dryer with hot water recovery, the waste heat absorption dryer with hot water recovery comprises: a dryer body, the surface of which is provided with a primary cooler, a hot water recovery heat exchanger, an auxiliary electric heater, a secondary cooler, an A adsorption tower and a B adsorption tower;

[0007] A fixed seat is provided with a moving block on the side of the fixed seat, a rotating block is provided on the side of the moving block, and a protective frame is provided at one end of the rotating block.

[0008] Preferably, the adsorption tower A and the adsorption tower B are fixedly connected to the surface of the desiccant body, the secondary cooler is fixedly connected to the sides of the adsorption tower A and the adsorption tower B, and the auxiliary electric heater is located above the hot water recovery heat exchanger.

[0009] Preferably, the hot water recovery heat exchanger can convert the air thermal energy into water thermal energy, and then send the converted thermal energy into a primary cooler for cooling, and finally separate it through a steam-water separator in the dryer body and discharge it from an automatic drain valve. The hot water recovery heat exchanger can use the recovered waste heat to heat water and preheat air. The temperature of the hot water is reduced after heat exchange, and then returns to the hot water recovery heat exchanger for heating, thereby realizing the recycling of hot water.

[0010] Preferably, the fixed seat has a square frame structure and is fixedly connected to the outer side of the drying machine body. A placement groove is provided on the side of the fixed seat. There are two groups of placement grooves, which are symmetrically distributed with respect to the fixed seat. An固定板 is arranged in the placement groove, and the固定板 has a square plate structure.

[0011] Preferably, a moving rod is arranged on the side of the固定板. There are two groups of moving rods, which are symmetrically distributed with respect to the固定板. A thread is provided on the surface of one end of the moving rod, and a limiting nut is screwed on the thread. A moving block is sleeved on the moving rod, and the moving block can displace along the moving rod. A traction spring is sleeved on the surface of the moving rod. One end of the traction spring is fixedly connected to the side of the固定板, and the other end of the traction spring is fixedly connected to the side of the moving block.

[0012] Preferably, a groove is provided on the side of the moving block. A support rod is arranged on the side of the groove. A limiting bearing is sleeved on the surface of the support rod. A rotating block is sleeved on the outer ring surface of the limiting bearing. A positioning card slot is provided on the side of the groove.

[0013] Preferably, a storage groove is provided on the side of the protective frame. A positioning frame is arranged on the surface of the protective frame. A moving opening is provided on the side of the positioning frame. A protective cover is arranged in the storage groove. The protective cover can be folded and compressed into the storage groove. One end of the protective cover is fixedly connected to the surface of the storage groove. The other end of the protective cover is provided with a sealing plate. The sealing plate has an overall "匚"-shaped plate structure. There are two groups of sealing plates, which are symmetrically distributed with respect to the drying machine body. A magic tape plane is arranged on the surface of one group of sealing plates, and a magic tape rough surface is arranged on the surface of the other group of sealing plates. The two protective covers can be unfolded and fixed by adhering the magic tape plane and the magic tape rough surface to cover the drying machine body as a whole.

[0014] Preferably, a vertical plate is fixedly connected to the upper surface of the sealing plate. The vertical plate has a square plate structure. A through hole is provided on the side of the vertical plate. A damping bearing is arranged in the through hole. A fixing rod is inserted into the damping bearing. A baffle is arranged at one end of the fixing rod. The fixing rod can be inserted into the positioning frame, and the baffle can be disengaged from the moving opening. The baffle has a square plate structure.

[0015] Preferably, a moving opening is provided on the side of the rotating block. A positioning rod is inserted into the moving opening. An elastic cord is arranged at one end of the positioning rod. One end of the elastic cord is fixedly connected to the side of the rotating block. A positioning groove is provided on the surface of the positioning rod. A damping rubber strip is arranged in the positioning groove. One end of the positioning rod can be inserted into the positioning card slot.

[0016] Preferably, the protective frame and the moving block can displace in the placement groove. The moving block can fill the placement groove. The protective frame has an overall "匚"-shaped plate structure. There are two groups of protective frames, which are symmetrically distributed with respect to the drying machine body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The waste heat adsorption dryer with hot water recovery proposed in the present invention utilizes the waste heat generated by the compressor in the dryer body during the compression process to regenerate the desiccant. No compressed air is consumed in the heating and regeneration process, and the energy consumption of the entire adsorption and regeneration process is close to zero. At the same time, the high-temperature heat of the compressed air is fully utilized to directly enter the regeneration adsorption layer. The high-temperature heat is absorbed by the adsorbent to reduce the heat load of the rear primary cooler, thereby reducing the cooling water consumption accordingly. Therefore, the compression heat has a very energy-saving characteristic and can maximize effective energy saving. The hot water recovery heat exchanger can use the recovered waste heat to heat water and preheat air. The temperature of the hot water after heat exchange is reduced and then returns to the hot water recovery heat exchanger for heating, thereby realizing the recycling of hot water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a partial cross-sectional view of the structure of the present invention;

[0021] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0022] Figure 4 This is a schematic diagram of the structure of the protection frame of the present invention;

[0023] Figure 5 for Figure 4 The enlarged structural diagram at B in the middle;

[0024] Figure 6 It is a partial cross-sectional view of the structural protection frame of the present invention;

[0025] Figure 7 for Figure 6 The enlarged structural diagram at C in the middle;

[0026] Figure 8 This is a parallel adsorption flow chart of the structure of the dryer body of the present invention;

[0027] Fig. 9 This is a flow chart of regeneration heating of the main body of the desiccant dryer of the present invention;

[0028] Fig.10 This is a flow chart of the regeneration and cooling of the dryer body of the present invention.

[0029] In the figure: 1. Dryer body; 2. Primary cooler; 3. Hot water recovery heat exchanger; 4. Auxiliary electric heater; 5. Secondary cooler; 6. Adsorption tower A; 7. Adsorption tower B; 8. Fixed seat; 9. Moving block;

[0030] 10. Rotating block; 11. Protective frame; 12. Placement slot; 13. Fixed plate; 14. Moving rod; 15. Limiting nut; 16. Traction spring; 17. Groove; 18. Support rod; 19. Limiting bearing; 20. Positioning slot; 21. Moving opening; 22. Positioning rod; 23. Elastic rope; 24. Positioning slot; 25. Damping rubber strip; 26. Storage slot; 27. Positioning frame; 28. Moving opening; 29. ​​Protective cover; 30. Sealing plate;

[0031] 31. Velcro flat surface; 32. Velcro fleece surface; 33. Vertical plate; 34. Damping bearing; 35. Fixing rod;

[0032] 36. Baffle. DETAILED DESCRIPTION

[0033] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figure 1-Figure 10 The present invention provides a technical solution: a waste heat absorption dryer with hot water recovery, the waste heat absorption dryer with hot water recovery comprises: a dryer body 1, a primary cooler 2, a hot water recovery heat exchanger 3, an auxiliary electric heater 4, a secondary cooler 5, an A adsorption tower 6 and a B adsorption tower 7 are arranged on the surface of the dryer body 1;

[0035] A fixed seat 8, a moving block 9 is arranged on the side of the fixed seat 8, a rotating block 10 is arranged on the side of the moving block 9, and a protective frame 11 is arranged at one end of the rotating block 10;

[0036] The desiccant is regenerated by utilizing the waste heat generated by the compressor in the dryer body 1 during the compression process. No compressed air is consumed during the heating and regeneration process, and the energy consumption of the entire adsorption and regeneration process is close to zero. At the same time, the high-temperature heat of the compressed air is fully utilized to directly enter the regeneration adsorption layer. The high-temperature heat is absorbed by the adsorbent, reducing the heat load of the rear primary cooler 2, thereby reducing the cooling water consumption accordingly. Therefore, the compression heat is very energy-saving and can achieve effective energy saving to the maximum extent. The hot water recovery heat exchanger 3 can use the recovered waste heat to heat water and preheat air. The temperature of the hot water after heat exchange is reduced and then returns to the hot water recovery heat exchanger 3 for heating, thereby realizing the recycling of hot water.

[0037] Embodiment 2: On the basis of Embodiment 1, in order to facilitate the hot water recovery of the dryer body 1, a hot water recovery heat exchanger 3 is provided. The A adsorption tower 6 and the B adsorption tower 7 are fixedly connected to the surface of the dryer body 1, and the secondary cooler 5 is fixedly connected to the sides of the A adsorption tower 6 and the B adsorption tower 7. The auxiliary electric heater 4 is located above the hot water recovery heat exchanger 3. The hot water recovery heat exchanger 3 can convert the air heat energy into the water heat energy, and then the converted heat energy enters the primary cooler 2 for cooling, and finally is separated by the steam-water separator in the dryer body 1 and discharged from the automatic drain valve. The hot water recovery heat exchanger 3 can use the recovered waste heat to heat water and preheat air. The temperature of the hot water after heat exchange is reduced, and then returns to the hot water recovery heat exchanger 3 for heating, thereby realizing the recycling of hot water;

[0038] The dryer body 1 firstly uses the parallel adsorption function. The parallel adsorption mainly includes: the hot air comes in through the hot water recovery heat exchanger 3 (converting the heat energy of the air into the heat energy of the water), enters the primary cooler 2 for cooling, is separated through the steam-water separator, and is discharged from the automatic drain valve. The dry low-temperature air is directly distributed from the proportional valve and adsorbed out from the A adsorption tower 6 and the B adsorption tower 7 in parallel. After regeneration heating, 15% of the hot air enters from the hot water recovery heat exchanger 3, and 85% of the hot air goes to the heater. The heater is not started for heating one (the high-temperature hot air discharged from the centrifuge enters the adsorption tower for heating and regeneration). The heating two is started. After the temperature is increased by the heater, it enters the B adsorption tower 7 from top to bottom for regeneration heating, desorbs the moisture in the adsorbent, and then is cooled and cooled through the secondary cooler 5. The saturated wet air condenses into water droplets, then enters the steam-water separator to separate the condensed water, which is discharged from the automatic drain valve, and then enters the A adsorption tower 6 for adsorption and drying. After adsorption, it comes out from the V7 valve;

[0039] Secondly, through regeneration cooling, the compressed air passes through the hot water recovery heat exchanger 3 (the compressed air is taken away by heat recovery), is cooled by the primary cooler 2, and is separated by the steam-water separator in the dryer body 1. The water is discharged from the automatic drain valve, and 29% of the compressed air enters after being throttled by the proportional valve, and then 69% of the compressed air is cooled from the V11 valve to the B adsorption tower 7. The hot air blown out from the bottom to the top passes through the V9 valve, and is cooled by the secondary cooler 5, and is combined with the gas diverted from the proportional valve, and then enters the A adsorption tower 6 from the V1 valve for adsorption drying, and high-quality air comes out.

[0040] Embodiment 3: On the basis of Embodiment 2, in order to facilitate the protection of the dryer body 1 when it is not in use, a protective frame 11 is provided. A groove 17 is formed on the side of the moving block 9. A support rod 18 is arranged on the side of the groove 17. A limiting bearing 19 is sleeved on the surface of the support rod 18. The rotating block 10 is sleeved on the outer ring surface of the limiting bearing 19. A positioning card slot 20 is formed on the side of the groove 17. A storage groove 26 is formed on the side of the protective frame 11. A positioning frame 27 is arranged on the surface of the protective frame 11. A moving opening 28 is formed on the side of the positioning frame 27. A protective cover 29 is arranged in the storage groove 26. The protective cover 29 can be folded and compressed into the storage groove 26. One end of the protective cover 29 is fixedly connected to the surface of the storage groove 26. The other end of the protective cover 29 is provided with a sealing plate 30. The sealing plate 30 is integrally in the shape of a "C"-shaped plate. There are two groups of sealing plates 30, and the two groups of sealing plates 30 are symmetrically distributed with respect to the dryer body 1. A magic tape plane 31 is arranged on the surface of one group of sealing plates 30, and a magic tape rough surface 32 is arranged on the surface of the other group of sealing plates 30. After the two groups of protective covers 29 are unfolded, they can be fixed by the adhesion of the magic tape plane 31 and the magic tape rough surface 32 to cover the dryer body 1 as a whole;

[0041] During use, the protective frame 11 can be rotated by means of the rotating block 10 cooperating with the limiting bearing 19. When the protective frame 11 is rotated to a suitable angle, the sealing plate 30 can be pulled out of the storage groove 26, so that the protective cover 29 in the storage groove 26 can also be pulled out. Then, the other group of sealing plates 30 is also pulled out, so that the dryer body 1 can be covered as a whole by the two groups of protective covers 29. Then, the magic tape plane 31 and the magic tape rough surface 32 are used to adhere to each other and fix, so that the protective cover 29 protects the dryer body 1 as a whole.

[0042] In order to improve the stability of the protective frame 11 after rotation, a positioning rod 22 is provided. A moving port 21 is formed on the side of the rotating block 10. The positioning rod 22 is inserted into the moving port 21. One end of the positioning rod 22 is provided with an elastic cord 23. One end of the elastic cord 23 is fixedly connected to the side of the rotating block 10. A positioning groove 24 is formed on the surface of the positioning rod 22. A damping rubber strip 25 is arranged in the positioning groove 24. One end of the positioning rod 22 can be inserted into the positioning card slot 20;

[0043] During use, when the protective frame 11 is rotated to a suitable angle, one end of the positioning rod 22 can be passed through the rotating block 10 so that one end of the positioning rod 22 is inserted into the positioning card slot 20, thus avoiding the problem that the rotating block 10 continues to rotate in cooperation with the limiting bearing 19. The setting of the damping rubber strip 25 also increases the friction between the positioning rod 22 and the inner side surface of the positioning card slot 20, avoiding the detachment of one end of the positioning rod 22 from the positioning card slot 20.

[0044] In order to facilitate the fixing of the sealing plate 30, there is a fixing rod 35. A vertical plate 33 is fixedly connected to the upper surface of the sealing plate 30. The vertical plate 33 is in the shape of a square plate. A through hole is provided on the side surface of the vertical plate 33. A damping bearing 34 is arranged in the through hole. The fixing rod 35 is inserted into the damping bearing 34. One end of the fixing rod 35 is provided with a baffle 36. The fixing rod 35 can be inserted into the positioning frame 27, and the baffle 36 can be disengaged from the moving opening 28. The baffle 36 is in the shape of a square plate;

[0045] When in use, when it is necessary to store the protective cover 29, first press the sealing plate 30 to fold and store the protective cover 29 into the storage groove 26. Then move the fixing rod 35 and insert it into the positioning frame 27.配合着阻尼轴承34对固定杆35进行转动使挡板36进行转动合适的角度避免固定杆35从定位框27内脱离出,阻尼轴承34的设置也避免固定杆35发生随意的转动问题,然后就可对密封板30进行固定,一方面利用密封板30对收纳槽26内进行填平,另一方面也可利用密封板30对防护罩29进行限位使防护罩29收纳进收纳槽26内。Rotate the fixing rod 35 in cooperation with the damping bearing 34 to rotate the baffle 36 at an appropriate angle to prevent the fixing rod 35 from disengaging from the positioning frame 27. The setting of the damping bearing 34 also prevents the fixing rod 35 from rotating randomly. Then the sealing plate 30 can be fixed. On the one hand, the sealing plate 30 is used to fill the storage groove 26, and on the other hand, the sealing plate 30 can also be used to limit the protective cover 29 so that the protective cover 29 is stored in the storage groove 26.

[0046] In order to facilitate the storage of the protective frame 11, a placement groove 12 is provided. A moving rod 14 is arranged on the side surface of the fixing plate 13. There are two groups of moving rods 14, and the two groups of moving rods 14 are symmetrically distributed with respect to the fixing plate 13. One end surface of the moving rod 14 is provided with a thread, and a limit nut 15 is screwed on the thread. The moving block 9 is sleeved on the moving rod 14, and the moving block 9 can displace along the moving rod 14. A traction spring 16 is sleeved on the surface of the moving rod 14. One end of the traction spring 16 is fixedly connected to the side surface of the fixing plate 13, and the other end of the traction spring 16 is fixedly connected to the side surface of the moving block 9. The fixing seat 8 is in the shape of a square frame, and the fixing seat 8 is fixedly connected to the outer side surface of the drying machine body 1. A placement groove 12 is provided on the side surface of the fixing seat 8. There are two groups of placement grooves 12, and the two groups of placement grooves 12 are symmetrically distributed with respect to the fixing seat 8. A fixing plate 13 is arranged in the placement groove 12. The fixing plate 13 is in the shape of a square plate. The protective frame 11 and the moving block 9 can displace in the placement groove 12, and the moving block 9 can fill the placement groove 12. The overall shape of the protective frame 11 is in the shape of a "匚" - shaped plate. There are two groups of protective frames 11, and the two groups of protective frames 11 are symmetrically distributed with respect to the drying machine body 1;

[0047] When in use, when rotating the protective frame 11 in cooperation with the limit bearing 19, after the protective frame 11 rotates to be parallel to the fixing seat 8, the elastic force of the traction spring 16 can be used to pull the two sides of the protective frame 11 to displace in the placement groove 12. The setting of the traction spring 16 also prevents the protective frame 11 from displacing randomly in the placement groove 12. Also, the placement groove 12 can be filled by the protective frame 11 to prevent the placement groove 12 from being exposed and affecting the overall aesthetics

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Waste heat absorption dryer with hot water recovery, characterized by: The waste heat absorption dryer with hot water recovery comprises: a dryer body (1), the surface of which is provided with a primary cooler (2), a hot water recovery heat exchanger (3), an auxiliary electric heater (4), a secondary cooler (5), an A absorption tower (6) and a B absorption tower (7); A fixed seat (8) is provided with a moving block (9) on the side of the fixed seat (8), a rotating block (10) is provided on the side of the moving block (9), and a protective frame (11) is provided at one end of the rotating block (10).

2. The waste heat drying machine with hot water recovery according to claim 1 is characterized in that: The A adsorption tower (6) and the B adsorption tower (7) are fixedly connected to the surface of the desiccant body (1), the secondary cooler (5) is fixedly connected to the sides of the A adsorption tower (6) and the B adsorption tower (7), and the auxiliary electric heater (4) is located above the hot water recovery heat exchanger (3).

3. The waste heat drying machine with hot water recovery according to claim 1 is characterized in that: The hot water recovery heat exchanger (3) can convert air heat energy into water heat energy, and then pass the converted heat energy into the primary cooler (2) for cooling, and finally separate it through the steam-water separator in the dryer body (1) and discharge it from the automatic drain valve. The hot water recovery heat exchanger (3) can use the recovered waste heat to heat water and preheat air. After the heat exchange, the temperature of the hot water is reduced and then returns to the hot water recovery heat exchanger (3) for heating, thereby realizing the recycling of hot water.

4. The waste heat drying machine with hot water recovery according to claim 1 is characterized in that: The fixing seat (8) is in the form of a square frame structure. The fixing seat (8) is fixedly connected to the outer side of the dryer body (1). A placement groove (12) is provided on the side of the fixing seat (8). The placement groove (12) is provided in two groups. The two groups of placement grooves (12) are symmetrically distributed about the fixing seat (8). A fixing plate (13) is provided in the placement groove (12). The fixing plate (13) is in the form of a square plate.

5. The waste heat absorption dryer with hot water recovery according to claim 4 is characterized in that: A moving rod (14) is arranged on the side of the fixed plate (13), and two groups of the moving rods (14) are arranged. The two groups of moving rods (14) are symmetrically distributed about the fixed plate (13). A thread is provided on the surface of one end of the moving rod (14), and a limiting nut (15) is screwed on the thread. The moving block (9) is sleeved on the moving rod (14), and the moving block (9) can be displaced along the moving rod (14). A traction spring (16) is sleeved on the surface of the moving rod (14), and one end of the traction spring (16) is fixedly connected to the side of the fixed plate (13), and the other end of the traction spring (16) is fixedly connected to the side of the moving block (9).

6. The waste heat drying machine with hot water recovery according to claim 1, characterized in that: The side of the moving block (9) is provided with a groove (17), the side of the groove (17) is provided with a support rod (18), the surface of the support rod (18) is sleeved with a limit bearing (19), the rotating block (10) is sleeved on the outer ring surface of the limit bearing (19), and the side of the groove (17) is provided with a positioning slot (20).

7. The waste heat drying machine with hot water recovery according to claim 1 is characterized in that: A storage groove (26) is formed on the side surface of the protective frame (11). A positioning frame (27) is arranged on the surface of the protective frame (11). A moving opening (28) is formed on the side surface of the positioning frame (27). A protective cover (29) is arranged in the storage groove (26). The protective cover (29) can be folded and compressed into the storage groove (26). One end of the protective cover (29) is fixedly connected to the surface of the storage groove (26). The other end of the protective cover (29) is provided with a sealing plate (30). The sealing plate (30) is integrally in a "C"-shaped plate structure. There are two groups of sealing plates (30). The two groups of sealing plates (30) are symmetrically distributed about the drying machine body (1). A magic tape flat surface (31) is arranged on the surface of one group of sealing plates (30), and a magic tape hairy surface (32) is arranged on the surface of the other group of sealing plates (30). After the two groups of protective covers (29) are unfolded, they can be fixed by the adhesion of the magic tape flat surface (31) and the magic tape hairy surface (32) to cover the drying machine body (1) as a whole.

8. The waste heat drying machine with hot water recovery according to claim 7 is characterized in that: A vertical plate (33) is fixedly connected to the upper surface of the sealing plate (30). The vertical plate (33) is in a square plate structure. A through hole is formed on the side surface of the vertical plate (33). A damping bearing (34) is arranged in the through hole. A fixing rod (35) is inserted into the damping bearing (34). A baffle (36) is arranged at one end of the fixing rod (35). The fixing rod (35) can be inserted into the positioning frame (27). The baffle (36) can be disengaged from the moving opening (28). The baffle (36) is in a square plate structure.

9. The waste heat drying machine with hot water recovery according to claim 6, characterized in that: A moving port (21) is formed on the side surface of the rotating block (10). A positioning rod (22) is inserted into the moving port (21). An elastic cord (23) is arranged at one end of the positioning rod (22). One end of the elastic cord (23) is fixedly connected to the side surface of the rotating block (10). A positioning groove (24) is formed on the surface of the positioning rod (22). A damping rubber strip (25) is arranged in the positioning groove (24). One end of the positioning rod (22) can be inserted into the positioning card slot (20).

10. The waste heat drying machine with hot water recovery according to claim 1, characterized in that: The protective frame (11) and the moving block (9) can be displaced in the placing groove (12). The moving block (9) can fill the placing groove (12). The protective frame (11) is integrally in a "C"-shaped plate structure. There are two groups of protective frames (11). The two groups of protective frames (11) are symmetrically distributed about the drying machine body (1).

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