Energy-saving gas drying machine with tail heat recovery structure and method

Abstract

The invention discloses an energy-saving gas drying machine provided with a tail heat recovery structure and a method, and belongs to the technical field of gas drying machines. The energy-saving gas drying machine comprises a base, the base is rotationally connected with a sand drying cylinder, and the base is provided with driving equipment used for driving the sand drying cylinder to rotate; the left end and the right end of the sand drying cylinder are rotationally connected with a feeding closed rotating sleeve and a discharging closed rotating sleeve correspondingly, the feeding closed rotating sleeve and the discharging closed rotating sleeve are both fixedly connected with the base, and the upper side wall of the discharging closed rotating sleeve fixedly communicates with an air exhaust barrel. An air exhausting mechanism for exhausting high-temperature moisture in the sand drying cylinder is arranged in the air exhausting barrel; high-temperature and high-humidity air exhausted by the sand drying cylinder can be condensed and dewatered through external cold air needed by combustion of the natural gas cooking range, dewatering work of gas exhausted by the sand drying cylinder can be achieved, and preheating of the external cold air needed by combustion of the natural gas cooking range can also be achieved; and the combustion efficiency of natural gas is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas dryers, and in particular to an energy-saving gas dryer and method provided with a tail heat recovery structure. Background Art

[0002] In the production process of sand, a drum dryer is needed to dry the sand. There are various types of sand dryers, including those that use natural gas as a heat source to dry the sand. The exhaust gas after the combustion of natural gas contains a large amount of water vapor and is not suitable for direct drying of the sand. Generally, heat exchange is used to heat the air, and then a blower is used to pass the heated air into the drum to achieve drying of the sand.

[0003] However, the existing gas-fired sand dryer passes air at about 700 degrees through one end of the drum when drying. After the hot air dries the sand, it will carry a large amount of water vapor and waste heat and be discharged directly from the other end of the drum, which leads to a large amount of heat dissipation, thereby increasing the energy consumption for heating; and a large amount of dust will be generated in the process of the sand tumbling driven by the drum, and the dust will also be directly discharged with the airflow, thereby causing air pollution in the surrounding environment.

[0004] Based on this, the present invention designs an energy-saving gas drying machine and method with a tail heat recovery structure to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide an energy-saving gas drying machine and method with a tail heat recovery structure to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an energy-saving gas dryer with a tail heat recovery structure, comprising a base, the base is rotatably connected to a sand drying cylinder, a driving device for driving the sand drying cylinder to rotate is provided on the base, the left and right ends of the sand drying cylinder are rotatably connected to a feed closed rotating sleeve and a discharge closed rotating sleeve respectively, the feed closed rotating sleeve and the discharge closed rotating sleeve are both fixedly connected to the base, the upper side wall of the discharge closed rotating sleeve is fixedly connected to an exhaust barrel, an exhaust mechanism for extracting high-temperature moisture in the sand drying cylinder is provided in the exhaust barrel, a first transmission mechanism for driving the exhaust mechanism to extract air is provided between the exhaust mechanism and the sand drying cylinder, and the exhaust barrel The upper outer part is fixedly connected with a first inner circulation pipe, the base is fixedly connected with a first water storage barrel, the top of the first water storage barrel is fixedly connected with a first heat exchange barrel, the top of the first heat exchange barrel is fixedly connected with the lower end of the first inner circulation pipe, the middle part of the first heat exchange barrel is fixedly connected with a first sheet-shaped spiral heat dissipation pipe, the outer wall of the first heat exchange barrel is fixedly connected with a second inner circulation pipe below the first sheet-shaped spiral heat dissipation pipe, the base is fixedly connected with a second water storage barrel, the upper end of the second water storage barrel is fixedly connected with a second heat exchange barrel, the middle part of the second heat exchange barrel is fixedly connected with a second sheet-shaped spiral heat dissipation pipe, and the second inner circulation pipe extends from one end of the second heat exchange barrel away from the first heat exchange barrel to the second heat exchange barrel The top wall of the second heat exchange barrel is fixedly connected with a second tail pipe, and the fourth inner circulation pipe is fixedly connected to the combustion chamber, and one end of the fourth inner circulation pipe extends outside the combustion chamber and is fixedly connected with the upper end of the second sheet-like spiral heat dissipation pipe. A blower is connected, and the blower is fixedly connected to the base. The output end of the blower is fixedly connected to the middle part of the feed closed rotating sleeve. A first air intake pipe is fixedly connected to the bottom of the combustion chamber. The end of the first air intake pipe away from the combustion chamber extends into the first heat exchange barrel and is fixedly connected to the lower end of the first sheet-like spiral heat dissipation tube. A second air intake pipe is fixedly connected to the upper end of the first sheet-like spiral heat dissipation tube. The upper end of the second air intake pipe extends to the outside of the first heat exchange barrel. A number of equidistantly distributed serpentine heating tubes are fixedly connected between the third inner circulation tube and the fourth inner circulation tube, and the serpentine heating tubes are all located in the combustion chamber. A natural gas stove located below the several serpentine heating tubes is fixedly connected in the combustion chamber.

[0007] As a further solution of the present invention, the exhaust mechanism includes a dehumidification fan, which is located in the exhaust barrel and below the connection between the exhaust barrel and the first internal circulation pipe. The rotating shaft of the dehumidification fan is rotatably connected to the top wall of the exhaust barrel, and the upper end of the rotating shaft of the dehumidification fan extends outside the exhaust barrel.

[0008] As a further solution of the present invention, the first transmission mechanism includes a first bevel gear, which is fixedly connected to the upper end of the rotating shaft of the dehumidifying fan, the first bevel gear is meshed with a second bevel gear, the second bevel gear is rotatably connected to the outer wall of the discharging closed rotating sleeve, the rotating shaft of the second bevel gear is fixedly connected to the first gear, the first gear is meshed with the second gear, the second gear is rotatably connected to the outer wall of the sand drying cylinder, the outer wall of the rotating shaft of the second gear is fixedly connected to a one-way bearing, the outer ring of the one-way bearing is fixedly connected to a third gear, the third gear is meshed with a fourth gear, and the fourth gear is fixedly sleeved on the outside of the sand drying cylinder.

[0009] As a further solution of the present invention, a spray mechanism for removing dust from the bottom end of the first inner circulation pipe is provided between the first heat exchange barrel and the second heat exchange barrel, the spray mechanism includes a sedimentation interconnection mechanism and two water cylinders, the two water cylinders are respectively fixedly connected to the middle of the top walls of the first heat exchange barrel and the second heat exchange barrel, the upper ends of the two water cylinders extend to the outside of the first heat exchange barrel and the second heat exchange barrel respectively and are both fixedly connected to the first drain pipe, the first drain pipe is respectively installed with a first one-way valve, the two first drain pipes are commonly fixedly connected to the second drain pipe at one end away from the water cylinder, one end of the second drain pipe extends to the bottom of the first inner circulation pipe and is both fixedly connected to a spray head; the lower ends of the two water cylinders extend to the bottom of the first sheet-like spiral heat dissipation pipe and the second sheet-like spiral heat dissipation pipe respectively and are both fixedly connected to a water pumping pipe, and the lower ends of the two water pumping pipes extend to the first water storage barrel and the second water storage barrel respectively The inner bottom, a second one-way valve is installed on the water pumping pipe, a piston is slidably connected in the water cylinder, a third one-way valve is installed on the piston, the upper end of the piston is fixedly connected with a sliding rod, the upper end of the sliding rod extends to the top of the water cylinder and is fixedly connected with a transmission flat circle, the inner sides of the two transmission flat circles are respectively movably connected with a first eccentric shaft and a second eccentric shaft, the first eccentric shaft and the second eccentric shaft have the same structure and size, the first eccentric shaft and the second eccentric shaft are in opposite directions, a transmission shaft is fixedly connected between the first eccentric shaft and the second eccentric shaft, the transmission shaft is rotatably connected to the discharge closing rotating sleeve, a second transmission mechanism for driving the transmission shaft to rotate is provided between the transmission shaft and the first transmission mechanism, and the sedimentation communication mechanism can separate the clean water and sewage in the first water storage barrel, and can communicate the clean water in the first water storage barrel with the clean water in the second water storage barrel.

[0010] As a further scheme of the present invention, the sedimentation interconnection mechanism includes a sedimentation separation cylinder, a conical guide plate and a sewage pipe. The sedimentation separation cylinder is fixedly connected to the middle part of the inner bottom wall of the first water storage barrel, and the sedimentation separation cylinder is arranged on the outer side of the water suction pipe located in the first water storage barrel. The height of the upper port of the sedimentation separation cylinder is higher than the height of the lower port of the water suction pipe. One side of the sedimentation separation cylinder is fixedly connected with a connecting pipe, and the connecting pipe extends to the outside of the first water storage barrel at one end away from the sedimentation separation cylinder and is fixedly connected with the second water storage barrel; the conical guide plate is fixedly sleeved on the outer side of the water suction pipe located in the first water storage barrel, and the conical guide plate is located directly above the sedimentation separation cylinder. The maximum diameter of the conical guide plate is smaller than the inner diameter of the first water storage barrel and larger than the outer diameter of the sedimentation separation cylinder; the upper end of the sewage pipe is fixedly connected to the bottom wall of the first water storage barrel, and the sewage pipe is located on the outer side of the sedimentation separation cylinder, and a sewage valve is provided on the sewage pipe.

[0011] As a further solution of the present invention, the second transmission mechanism includes a third bevel gear, the third bevel gear is fixedly connected to the outer wall of the transmission shaft, the third bevel gear is meshed with a fourth bevel gear, and the fourth bevel gear is fixedly connected to the rotating shaft of the second bevel gear.

[0012] As a further solution of the present invention, an intake fan is rotatably connected to one end of the second intake pipe away from the first sheet-like spiral heat dissipation pipe, and the rotating shaft of the intake fan extends to the outside of the second intake pipe and is fixedly connected to the rotating shaft of the first eccentric shaft. An exhaust fan is rotatably connected to one end of the second tail pipe away from the second heat exchange barrel, and the rotating shaft of the exhaust fan extends to the outside of the second tail pipe and is fixedly connected to the rotating shaft of the second eccentric shaft.

[0013] When the above scheme is put into practical use,

[0014] A drying method for an energy-saving gas drying machine provided with a tail heat recovery structure, the method comprising the following steps:

[0015] Step 1: The sand drying cylinder filled with an appropriate amount of sand is driven to rotate by a driving device, and the sand drying cylinder drives the exhaust mechanism to exhaust air through the first transmission mechanism;

[0016] Step 2: Start the blower. Under the joint action of the blower and the exhaust mechanism, the drying airflow in the sand drying cylinder is sequentially transported to the discharging closed rotary sleeve, the exhaust barrel, the first internal circulation pipe, the first heat exchange barrel, the second internal circulation pipe, the second sheet-shaped spiral heat dissipation pipe, the third internal circulation pipe, the serpentine heating pipe and the fourth internal circulation pipe, and finally returns to the sand drying cylinder to realize the internal circulation of the air used for drying;

[0017] Step 3: Light the natural gas stove, and the outside cold air is transported to the bottom of the natural gas stove through the second air intake pipe / the first sheet-shaped spiral heat dissipation pipe / the first air intake pipe in turn, and the exhaust gas from the natural gas stove is discharged through the first exhaust pipe / the second sheet-shaped spiral heat dissipation pipe and the second exhaust pipe in turn; the outside cold air is condensed and dehydrated with the internal circulation air in the first heat exchange barrel through the first sheet-shaped spiral heat dissipation pipe, and the exhaust gas in the second heat exchange barrel preheats the internal circulation air in the second sheet-shaped spiral heat dissipation pipe, and the natural gas stove heats the internal circulation air in the serpentine heating pipe;

[0018] Step 4: At the same time, the spray mechanism uses the condensed water in the first heat exchange barrel and the second heat exchange barrel to continuously spray and remove dust from the internal circulating air;

[0019] Step 5: After repeated dust removal, blowing, preheating and heating, the internal circulating air can continuously dry the sand tumbling in the sand drying cylinder efficiently and energy-savingly.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention can condense and dehydrate the high-temperature and high-humidity air discharged from the sand drying cylinder through the external cold air required for combustion of the natural gas stove, which can not only realize the dehydration of the gas discharged from the sand drying cylinder, but also realize the preheating of the external cold air required for combustion of the natural gas stove, thereby improving the combustion efficiency of natural gas; the present invention can preheat the exhaust gas discharged after ignition of the natural gas stove and the dehydrated air, thereby improving the utilization rate of heat; the dryer can also heat the preheated dry air through the ignited natural gas stove, and finally can transport the heated dry air back to the sand drying cylinder, thereby realizing the internal circulation of the airflow used to dry the sand, avoiding the occurrence of a large amount of heat loss due to dehumidification, and further improving the utilization rate of heat.

[0022] 2. The spray mechanism in the present invention can convert the power of the rotation of the sand drying cylinder into water pressure through the cooperation of the first transmission mechanism and the second transmission mechanism, so that the sedimentation separation cylinder can continuously spray the lower port of the first internal circulation pipe, thereby realizing the dust removal effect of the drying airflow circulating in the dryer. The spray mechanism only needs to add an appropriate amount of water source at the beginning. Later, the condensed water in the first heat exchange barrel and the second heat exchange barrel will continuously replenish the water source to the spray mechanism, and no additional water is needed subsequently; the sedimentation interconnection mechanism in the spray mechanism can precipitate the turbid water flowing into the first water storage barrel after spraying, so that the clean water and sewage in the first water storage barrel are separated, and the clean water in the second water storage barrel is interconnected with the clean water in the first water storage barrel, so that the first water storage barrel and the second water storage barrel can continuously provide the spray mechanism with clean water for spraying, and when the water level in the first water storage barrel and the second water storage barrel is too high, the sewage in the first water storage barrel can be discharged through the sewage pipe to ensure the continuous spraying work of the spray mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention from a front side perspective;

[0024] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0025] Figure 3 It is a cross-sectional view of the feed sealing rotary sleeve, the discharge sealing rotary sleeve and their internal structures;

[0026] Figure 4 It is a schematic diagram of the overall structure of the present invention from a rear side perspective;

[0027] Figure 5 A schematic diagram of the cross-sectional structure of the first heat exchange barrel and the second heat exchange barrel;

[0028] Figure 6 It is a cross-sectional view of the water tank and its internal structure;

[0029] Figure 7 It is a schematic diagram of the cross-sectional structure of the second sheet-shaped spiral heat dissipation tube and the third internal circulation tube;

[0030] Figure 8 It is a cross-sectional view of the combustion chamber and its internal structure;

[0031] Fig. 9 The figure is a flow chart of the method of the present invention.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 1. Base; 2. Sand drying cylinder; 3. Driving equipment; 4. Feeding closed rotating sleeve; 5. Discharging closed rotating sleeve; 6. Vacuum barrel; 7. First internal circulation pipe; 8. First water storage barrel; 9. First heat exchange barrel; 10. First sheet spiral heat dissipation pipe; 11. Second internal circulation pipe; 12. Second water storage barrel; 13. Second heat exchange barrel; 14. Second sheet spiral heat dissipation pipe; 15. Combustion chamber; 16. Third internal circulation pipe; 17. First tail pipe; 18. Second tail pipe; 19. Fourth internal circulation pipe; 20. Blower; 21. First air intake pipe; 22. Second air intake pipe; 23. Snake heating pipe; 24. Natural gas stove; 25. Water tank; 26. First drain pipe; 27. a one-way valve; 28, a second drain pipe; 29, a sprinkler head; 30, a water extraction pipe; 31, a second one-way valve; 32, a piston; 33, a third one-way valve; 34, a slide rod; 35, a transmission flat circle; 36, a first eccentric shaft; 37, a second eccentric shaft; 38, a transmission shaft; 39, a sedimentation separation cylinder; 40, a connecting pipe; 41, a conical guide plate; 42, a dehumidifying fan; 43, a first bevel gear; 44, a second bevel gear; 45, a first gear; 46, a second gear; 47, a one-way bearing; 48, a third gear; 49, a fourth gear; 50, a third bevel gear; 51, a fourth bevel gear; 52, an intake fan; 53, an exhaust fan; 54, a sewage pipe; 55, a sewage valve. DETAILED DESCRIPTION

[0034] See also Figure 1-9The present invention provides a technical solution: an energy-saving gas drying machine with a tail heat recovery structure, comprising a base 1, the base 1 is rotatably connected to a sand drying cylinder 2, the base 1 is provided with a driving device 3 for driving the sand drying cylinder 2 to rotate, the left and right ends of the sand drying cylinder 2 are rotatably connected to a feed closed rotating sleeve 4 and a discharge closed rotating sleeve 5, the feed closed rotating sleeve 4 and the discharge closed rotating sleeve 5 are both fixedly connected to the base 1, the upper side wall of the discharge closed rotating sleeve 5 is fixedly connected to an exhaust barrel 6, an exhaust mechanism for extracting high-temperature moisture in the sand drying cylinder 2 is provided in the exhaust barrel 6, a first transmission mechanism for driving the exhaust mechanism to extract air is provided between the exhaust mechanism and the sand drying cylinder 2, and the upper outer side of the exhaust barrel 6 is fixedly connected to A first inner circulation pipe 7 is connected, a first water storage barrel 8 is fixedly connected to the base 1, the top of the first water storage barrel 8 is fixedly connected to the first heat exchange barrel 9, the top of the first heat exchange barrel 9 is fixedly connected to the lower end of the first inner circulation pipe 7, the middle part of the first heat exchange barrel 9 is fixedly connected to the first sheet spiral heat dissipation pipe 10, the outer wall of the first heat exchange barrel 9 is fixedly connected to the second inner circulation pipe 11 below the first sheet spiral heat dissipation pipe 10, a second water storage barrel 12 is fixedly connected to the base 1, the upper end of the second water storage barrel 12 is fixedly connected to the second heat exchange barrel 13, the middle part of the second heat exchange barrel 13 is fixedly connected to the second sheet spiral heat dissipation pipe 14, the second inner circulation pipe 11 extends from one end away from the first heat exchange barrel 9 to the second The heat exchange barrel 13 is fixedly connected to the upper end of the second sheet-like spiral heat dissipation tube 14, and a combustion chamber 15 is fixedly connected to the base 1. The lower end of the second sheet-like spiral heat dissipation tube 14 is fixedly connected to a third internal circulation tube 16, and one end of the third internal circulation tube 16 away from the second sheet-like spiral heat dissipation tube 14 extends to the outside of the second heat exchange barrel 13 and extends into the combustion chamber 15. A first tail pipe 17 is fixedly connected between the lower end of the outer wall of the second heat exchange barrel 13 and the upper end of the outer wall of the combustion chamber 15. The first tail pipe 17 is located outside the third internal circulation tube 16, and the inner diameter of the first tail pipe 17 is larger than the outer diameter of the third internal circulation tube 16. The top wall of the second heat exchange barrel 13 is fixedly connected to a second tail pipe 18, and the combustion chamber 15 is fixedly connected to the fourth Inner circulation pipe 19, one end of the fourth inner circulation pipe 19 extends to the outside of the combustion chamber 15 and is fixedly connected to a blower 20, the blower 20 is fixedly connected to the base 1, the output end of the blower 20 is fixedly connected to the middle of the feed closed rotary sleeve 4, the bottom of the combustion chamber 15 is fixedly connected to a first air intake pipe 21, the end of the first air intake pipe 21 away from the combustion chamber 15 extends into the first heat exchange barrel 9 and is fixedly connected to the lower end of the first sheet-like spiral heat dissipation tube 10, the upper end of the first sheet-like spiral heat dissipation tube 10 is fixedly connected to a second air intake pipe 22, the upper end of the second air intake pipe 22 extends to the outside of the first heat exchange barrel 9, a plurality of equidistantly distributed serpentine heating pipes 23 are fixedly connected between the third inner circulation pipe 16 and the fourth inner circulation pipe 19,The serpentine heating tubes 23 are all located in the combustion chamber 15, and a natural gas stove 24 located below the serpentine heating tubes 23 is fixedly connected in the combustion chamber 15.

[0035] When the above scheme is put into practical use, after a proper amount of sand is loaded into the sand drying cylinder 2, the driving device 3 and the blower 20 are started, and the natural gas stove 24 is ignited; the driving device 3 drives the sand drying cylinder 2 to rotate, and the sand drying cylinder 2 causes the sand to be constantly turned over, thereby increasing the contact area between the sand and the air; the natural gas stove 24 heats the airflow passing through the serpentine heating tube 23 to about 700 degrees, and the blower 20 extracts the ultra-high temperature air in the serpentine heating tube 23 through the fourth internal circulation tube 19, and discharges the high temperature air into the left end of the sand drying cylinder 2 through the feed closed rotary sleeve 4; the ultra-high temperature air dries the sand in the sand drying cylinder 2 and drops to about 100 degrees and carries a certain amount of dust and a large amount of steam; the rotating sand drying cylinder 2 The exhaust mechanism is driven by the first transmission mechanism to operate, and the high-temperature and high-humidity air is transported from the right end of the sand drying cylinder 2 to the discharge closed rotary sleeve 5, the exhaust barrel 6, the first internal circulation pipe 7 and the first heat exchange barrel 9 in sequence under the action of the exhaust mechanism. At the same time, under the rising effect of the combustion of the natural gas stove 24, the external cold air enters the bottom of the combustion chamber 15 through the second air intake pipe 22, the first sheet-like spiral heat dissipation pipe 10 and the first air intake pipe 21 in sequence, and the external cold air exchanges heat with the medium-temperature air in the first heat exchange barrel 9 through the outer wall of the first sheet-like spiral heat dissipation pipe 10; the high-temperature and high-humidity air condenses and cools down to about 70 degrees, and the external cold air heats up to about 60 degrees, and the condensed water flows along the first sheet-like spiral heat dissipation pipe 10. The outer wall of the heat pipe 10 and the inner wall of the first heat exchange barrel 9 flow into the first water storage barrel 8; the dehydrated neutral air is then transported to the second sheet-shaped spiral heat dissipation tube 14 through the second inner circulation tube 11 at the bottom of the first heat exchange barrel 9, and at the same time, the high-temperature exhaust gas after the natural gas stove 24 in the combustion chamber 15 heats the serpentine heating tube 23 is discharged into the second heat exchange barrel 13 through the first exhaust pipe 17 and the temperature is about 200 degrees. In this way, the dehydrated neutral air exchanges heat with the high-temperature exhaust gas in the second heat exchange barrel 13 through the outer wall of the second sheet-shaped spiral heat dissipation tube 14; the dehydrated neutral air is heated by more than 100 degrees and transported back to the serpentine heating tube 23 through the third inner circulation tube 16, and is heated to about 700 degrees again; because the natural gas stove 24 burns The high-temperature exhaust gas generated by combustion contains a large amount of water vapor, so the high-temperature exhaust gas will condense while being cooled, and the dew flows along the outer wall of the second sheet-shaped spiral heat dissipation tube 14 and the inner wall of the second heat exchange barrel 13 to the second water storage barrel 12; in this way, the dryer can condense and dehydrate the high-temperature and high-humidity air discharged from the sand drying cylinder 2 through the external cold air required for the combustion of the natural gas stove 24, which can not only realize the dehydration of the gas discharged from the sand drying cylinder 2, but also realize the preheating of the external cold air required for the combustion of the natural gas stove 24, thereby improving the combustion efficiency of the natural gas; the dryer can preheat the exhaust gas discharged after the natural gas stove 24 is ignited and the dehydrated air, thereby improving the utilization rate of heat;The dryer can also heat the preheated dry air by igniting the natural gas burner 24, and finally transport the heated dry air back to the sand drying cylinder 2, thereby realizing the internal circulation of the airflow used to dry the sand, avoiding the loss of a large amount of heat due to dehumidification, and further improving the utilization rate of heat. ;

[0036] As a further solution of the present invention, the exhaust mechanism includes a dehumidification fan 42, which is located in the vacuum barrel 6 and below the connection between the vacuum barrel 6 and the first internal circulation pipe 7. The rotating shaft of the dehumidification fan 42 is rotatably connected to the top wall of the vacuum barrel 6, and the upper end of the rotating shaft of the dehumidification fan 42 extends outside the vacuum barrel 6.

[0037] When the above scheme is put into actual use, the rotating sand drying cylinder 2 drives the rotating shaft of the dehumidifying fan 42 to rotate through the first transmission mechanism, and the rotating shaft of the dehumidifying fan 42 drives the dehumidifying fan 42 to rotate. The rotating dehumidifying fan 42 can extract the air in the discharge sealing rotating sleeve 5, thereby realizing the extraction of the high-temperature and high-humidity air discharged from the sand drying cylinder 2.

[0038] As a further solution of the present invention, the first transmission mechanism includes a first bevel gear 43, which is fixedly connected to the upper end of the rotating shaft of the dehumidifying fan 42, the first bevel gear 43 is meshed with a second bevel gear 44, the second bevel gear 44 is rotatably connected to the outer wall of the discharging closed rotating sleeve 5, the rotating shaft of the second bevel gear 44 is fixedly connected to a first gear 45, the first gear 45 is meshed with a second gear 46, the second gear 46 is rotatably connected to the outer wall of the sand drying cylinder 2, the outer wall of the rotating shaft of the second gear 46 is fixedly connected to a one-way bearing 47, the outer ring of the one-way bearing 47 is fixedly connected to a third gear 48, the third gear 48 is meshed with a fourth gear 49, and the fourth gear 49 is fixedly sleeved on the outside of the sand drying cylinder 2.

[0039] When the above scheme is put into actual use, when the sand in the sand drying cylinder 2 is dried, the driving device 3 drives the sand drying cylinder 2 to rotate counterclockwise, the sand drying cylinder 2 drives the sand to roll, and the sand drying cylinder 2 drives the fourth gear 49 to rotate, the fourth gear 49 drives the third gear 48 to rotate clockwise, the third gear 48 drives the second gear 46 to rotate through the one-way bearing 47 and the rotating shaft of the second gear 46, the second gear 46 drives the first gear 45 to rotate, the first gear 45 drives the second bevel gear 44 to rotate through the rotating shaft of the second bevel gear 44, the second bevel gear 44 drives the first bevel gear 43 to rotate, the first bevel gear 43 drives the dehumidification fan 42 to rotate through the rotating shaft of the dehumidification fan 42, thereby realizing the operation of the exhaust mechanism.

[0040] As a further solution of the present invention, a spray mechanism for removing dust from the bottom end of the first inner circulation pipe 7 is provided between the first heat exchange barrel 9 and the second heat exchange barrel 13, and the spray mechanism includes a sedimentation intercommunication mechanism and two water cylinders 25, the two water cylinders 25 are respectively fixedly connected to the middle of the top wall of the first heat exchange barrel 9 and the second heat exchange barrel 13, the upper ends of the two water cylinders 25 extend to the outside of the first heat exchange barrel 9 and the second heat exchange barrel 13 respectively and are fixedly connected with a first drain pipe 26, the first drain pipe 26 is installed with a first one-way valve 27, the two first drain pipes 26 are fixedly connected with a second drain pipe 28 at one end away from the water cylinder 25, one end of the second drain pipe 28 extends to the bottom of the first inner circulation pipe 7 and is fixedly connected with a spray head 29; the lower ends of the two water cylinders 25 extend to the bottom of the first sheet spiral heat dissipation tube 10 and the second sheet spiral heat dissipation tube 14 respectively and are fixedly connected with a pumping pipe 30, the lower ends of the two pumping pipes 30 extend to the bottom of the first water storage barrel 8 and the second water storage barrel 12 respectively, The water pumping pipe 30 is equipped with a second one-way valve 31, the water cylinder 25 is slidably connected with a piston 32, the piston 32 is equipped with a third one-way valve 33, the upper end of the piston 32 is fixedly connected with a slide rod 34, the upper end of the slide rod 34 extends to the top of the water cylinder 25 and is fixedly connected with a transmission flat circle 35, the inner sides of the two transmission flat circles 35 are movably connected with a first eccentric shaft 36 and a second eccentric shaft 37, the first eccentric shaft 36 and the second eccentric shaft 37 have the same structure and size The first eccentric shaft 36 and the second eccentric shaft 37 are oriented in opposite directions, a transmission shaft 38 is fixedly connected between the first eccentric shaft 36 and the second eccentric shaft 37, the transmission shaft 38 is rotatably connected to the discharge sealing rotating sleeve 5, a second transmission mechanism for driving the transmission shaft 38 to rotate is provided between the transmission shaft 38 and the first transmission mechanism, and the sedimentation communication mechanism can separate the clean water and sewage in the first water storage barrel 8, and can communicate the clean water in the first water storage barrel 8 with the clean water in the second water storage barrel 12.

[0041] When the above scheme is put into actual use, it is necessary to add an appropriate amount of water to the first water storage barrel 8 and the second water storage barrel 12 in advance to ensure that the water surface at least overflows the lower end of the water pumping pipe 30, and the water cylinder 25 and the water pumping pipe 30 are initially filled with water; during operation, the first transmission machine drives the third gear 48 to rotate through the second transmission mechanism, and the third gear 48 drives the first eccentric shaft 36 and the second eccentric shaft 37 to rotate in opposite directions, and the first eccentric shaft 36 and the second eccentric shaft 37 respectively drive the pistons 32 on both sides to slide up and down in opposite directions through the cooperation of the transmission flat circle 35 and the slide rod 34 on both sides; when the piston 32 slides upward, under the action of water pressure, the second one-way valve 31 and the first one-way valve 27 are automatically opened, and the third one-way valve 33 is automatically closed. At this time, the water in the first water storage barrel 8 or the second water storage barrel 12 is pumped into the water cylinder 25 on the lower side of the piston 32 through the water pumping pipe 30, and the piston 32 squeezes the water on the upper side of the water cylinder 25 to the first drainage pipe 26 and the second drainage pipe 26 in turn. When the piston 32 slides downward, the second one-way valve 31 and the first one-way valve 27 are automatically closed, and the third one-way valve 33 is automatically opened. The water on the lower side of the piston 32 in the water cylinder 25 enters the upper side of the piston 32 through the third one-way valve 33. When the pistons 32 on both sides slide up and down in opposite directions, the spray head 29 can continuously spray the first inner circulation pipe 7. The lower port of the ring pipe 7 is sprayed; the spraying water can reduce dust on the dust-containing high-temperature and high-humidity airflow sprayed from the first internal circulation pipe 7 into the first heat exchange barrel 9. After dust reduction, the turbid water flows along the outer wall of the first sheet-like spiral heat dissipation tube 10 and the inner wall of the first heat exchange barrel 9 to flow into the first water storage barrel 8. The sedimentation and interconnection mechanism in the first water storage barrel 8 can settle the turbid water, and can separate the clean water and sewage after sedimentation, and can connect the clean water separated in the first water storage barrel 8 with the clean water in the second water storage barrel 12.

[0042] As a further solution of the present invention, the sedimentation intercommunication mechanism includes a sedimentation separation cylinder 39, a conical guide plate 41 and a sewage pipe 54, the sedimentation separation cylinder 39 is fixedly connected to the middle part of the inner bottom wall of the first water storage barrel 8, the sedimentation separation cylinder 39 is arranged on the outer side of the water pumping pipe 30 located in the first water storage barrel 8, the height of the upper port of the sedimentation separation cylinder 39 is higher than the height of the lower port of the water pumping pipe 30, one side of the sedimentation separation cylinder 39 is fixedly connected with a connecting pipe 40, and the connecting pipe 40 extends away from one end of the sedimentation separation cylinder 39. To the outside of the first water storage barrel 8 and fixedly connected with the second water storage barrel 12; the conical guide plate 41 is fixedly sleeved on the outside of the water suction pipe 30 located in the first water storage barrel 8, and the conical guide plate 41 is located directly above the sedimentation separation cylinder 39, and the maximum diameter of the conical guide plate 41 is smaller than the inner diameter of the first water storage barrel 8 and larger than the outer diameter of the sedimentation separation cylinder 39; the upper end of the sewage pipe 54 is fixedly connected with the bottom wall of the first water storage barrel 8, and the sewage pipe 54 is located outside the sedimentation separation cylinder 39, and a sewage valve 55 is provided on the sewage pipe 54.

[0043] When the above scheme is put into actual use, the initial water level in the first water storage barrel 8 just overflows the upper port of the sedimentation separation cylinder 39. When the turbid water flows from the channel between the first heat exchange barrel 9 and the first water storage barrel 8 into the first water storage barrel 8, the turbid water flows along the slope surface of the conical guide plate 41 and the inner wall of the first water storage barrel 8 to the bottom of the first water storage barrel 8 in turn. The dust particles in the turbid water settle in the outer area of ​​the sedimentation separation cylinder 39 at the bottom of the first water storage barrel 8, so that the water flowing into the sedimentation separation cylinder 39 area remains clear. The connecting pipe 40 is set. The clean water in the sedimentation separation cylinder 39 can flow into the second water storage barrel 12, so that the water levels in the second water storage barrel 12 and the sedimentation separation cylinder 39 are always consistent. Because the condensed water in the first heat exchange barrel 9 and the second heat exchange barrel 13 always replenishes the water source in the first water storage barrel 8 and the second water storage barrel 12 respectively, the water levels in the first water storage barrel 8 and the second water storage barrel 12 will slowly and gradually rise. When the water level rises to a certain height, the drain valve 55 is opened to discharge the sewage accumulated at the bottom of the first water storage barrel 8 through the drain pipe 54. When the digital level drops to or When approaching the upper port of the sedimentation separation cylinder 39, close the drain valve 55; in this way, the spray mechanism can convert the power of the rotation of the sand drying cylinder 2 into water pressure through the cooperation of the first transmission mechanism and the second transmission mechanism, so that the sedimentation separation cylinder 39 can continue to spray the lower port of the first internal circulation pipe 7, thereby realizing the dust removal effect of the drying airflow circulating in the dryer. The spray mechanism only needs to add a proper amount of water source at the beginning, and the condensed water in the first heat exchange barrel 9 and the second heat exchange barrel 13 will continue to replenish water source to the spray mechanism in the later stage, and no additional water source is needed in the future. Add water; the sedimentation and communication mechanism in the spraying mechanism can precipitate the turbid water flowing into the first water storage barrel 8 after spraying, so as to separate the clean water and sewage in the first water storage barrel 8, and make the clean water in the second water storage barrel 12 communicate with the clean water in the first water storage barrel 8, so that the first water storage barrel 8 and the second water storage barrel 12 can continuously provide the spraying mechanism with clean water for spraying, and when the water level in the first water storage barrel 8 and the second water storage barrel 12 is too high, the sewage in the first water storage barrel 8 can be discharged through the sewage pipe 54 to ensure the continuous spraying work of the spraying mechanism.

[0044] As a further solution of the present invention, the second transmission mechanism includes a third bevel gear 50, and the third bevel gear 50 is fixedly connected to the outer wall of the transmission shaft 38. The third bevel gear 50 is meshed with a fourth bevel gear 51, and the fourth bevel gear 51 is fixedly connected to the rotating shaft of the second bevel gear 44; during operation, when the second bevel gear 44 rotates, the rotating shaft of the second bevel gear 44 drives the fourth bevel gear 51 to rotate, the fourth bevel gear 51 drives the third bevel gear 50 to rotate, and the third bevel gear 50 drives the transmission shaft 38 to rotate, so that the pistons 32 on both sides slide back and forth in opposite directions.

[0045] As a further solution of the present invention, an end of the second air intake pipe 22 away from the first sheet-like spiral heat dissipation pipe 10 is rotatably connected to an air intake fan 52, and the rotating shaft of the air intake fan 52 extends to the outside of the second air intake pipe 22 and is fixedly connected to the rotating shaft of the first eccentric shaft 36. An end of the second tail pipe 18 away from the second heat exchange barrel 13 is rotatably connected to an exhaust fan 53, and the rotating shaft of the exhaust fan 53 extends to the outside of the second tail pipe 18 and is fixedly connected to the rotating shaft of the second eccentric shaft 37. During operation, when the transmission shaft 38 drives the exhaust fan 53, the exhaust fan 53 rotates to rotate ... When the first eccentric shaft 36 and the second eccentric shaft 37 rotate, the first eccentric shaft 36 and the second eccentric shaft 37 respectively drive the intake fan 52 and the exhaust fan 53 to rotate. The rotating intake fan 52 can help to draw the external expansion cold air to the bottom of the combustion chamber 15, thereby ensuring the oxygen supply when the natural gas stove 24 is ignited; the rotating exhaust fan 53 can help to extract the exhaust gas in the upper part of the second sheet-like spiral heat dissipation tube 14 through the second exhaust pipe 18, thereby ensuring that the exhaust gas generated by the combustion in the combustion chamber 15 can be discharged in time.

[0046] When the above scheme is put into practical use,

[0047] A drying method for an energy-saving gas drying machine provided with a tail heat recovery structure, the method comprising the following steps:

[0048] Step 1: The sand drying cylinder 2 filled with a proper amount of sand is driven to rotate by the driving device 3, and the sand drying cylinder 2 drives the exhaust mechanism to exhaust air through the first transmission mechanism;

[0049] Step 2: Start the blower 20. Under the joint action of the blower 20 and the exhaust mechanism, the drying airflow in the sand drying cylinder 2 is sequentially transported to the discharging closed rotary sleeve 5, the exhaust barrel 6, the first internal circulation pipe 7, the first heat exchange barrel 9, the second internal circulation pipe 11, the second sheet-shaped spiral heat dissipation pipe 14, the third internal circulation pipe 16, the serpentine heating pipe 23 and the fourth internal circulation pipe 19, and finally returns to the sand drying cylinder 2 to realize the internal circulation of the air used for drying;

[0050] Step 3: Light the natural gas stove 24, and the external cold air is transported to the bottom of the natural gas stove 24 through the second air inlet pipe 22, the first sheet-shaped spiral heat dissipation tube 10, and the first air inlet pipe 21 in sequence. The exhaust gas burned by the natural gas stove 24 is discharged through the first exhaust pipe 17, the second sheet-shaped spiral heat dissipation tube 14, and the second exhaust pipe 18 in sequence; the external cold air passes through the first sheet-shaped spiral heat dissipation tube 10 and the internal circulation air in the first heat exchange barrel 9 to condense and remove water, and the exhaust gas in the second heat exchange barrel 13 preheats the internal circulation air in the second sheet-shaped spiral heat dissipation tube 14, and the natural gas stove 24 heats the internal circulation air in the serpentine heating tube 23;

[0051] Step 4: At the same time, the spray mechanism uses the condensed water in the first heat exchange barrel 9 and the second heat exchange barrel 13 to continuously spray and remove dust from the internal circulating air;

[0052] Step 5: After repeated dust removal, blowing, preheating and heating, the internal circulating air can continue to dry the sand tumbling in the sand drying cylinder 2 in an efficient and energy-saving manner.

Claims

1. An energy-saving gas drying machine with a tail heat recovery structure, comprising a base (1), the base (1) being rotatably connected to a sand drying cylinder (2), the base (1) being provided with a driving device (3) for driving the sand drying cylinder (2) to rotate, characterized in that: The left and right ends of the sand drying cylinder (2) are rotatably connected to a feed sealing rotating sleeve (4) and a discharge sealing rotating sleeve (5), respectively. The feed sealing rotating sleeve (4) and the discharge sealing rotating sleeve (5) are both fixedly connected to the base (1). The upper side wall of the discharge sealing rotating sleeve (5) is fixedly connected to an air extraction barrel (6). An air extraction mechanism for extracting high-temperature humid air from the sand drying cylinder (2) is provided in the air extraction barrel (6). A first transmission mechanism for driving the air extraction mechanism to extract air is provided between the air extraction mechanism and the sand drying cylinder (2). A first internal circulation pipe (7) is fixedly connected to the upper outer side of the air extraction barrel (6). A first water storage barrel (8) is fixedly connected to the base (1). The top of the first water storage barrel (8) is fixedly connected to a first heat exchange The heat exchange barrel (9) is a heat exchange barrel having a top end fixedly connected to a lower end of a first internal circulation pipe (7), a first sheet-shaped spiral heat dissipation pipe (10) is fixedly connected to the middle of the first heat exchange barrel (9), a second internal circulation pipe (11) is fixedly connected to the outer wall of the first heat exchange barrel (9) below the first sheet-shaped spiral heat dissipation pipe (10), a second water storage barrel (12) is fixedly connected to the base (1), a second water storage barrel (12) is fixedly connected to the upper end of the second water storage barrel (12) is fixedly connected to a second heat exchange barrel (13), a second sheet-shaped spiral heat dissipation pipe (14) is fixedly connected to the middle of the second heat exchange barrel (13), an end of the second internal circulation pipe (11) away from the first heat exchange barrel (9) extends into the second heat exchange barrel (13) and is connected to the second internal circulation pipe (11). The upper end of the sheet-shaped spiral heat dissipation tube (14) is fixedly connected, and the base (1) is fixedly connected to a combustion chamber (15). The lower end of the second sheet-shaped spiral heat dissipation tube (14) is fixedly connected to a third internal circulation tube (16). An end of the third internal circulation tube (16) away from the second sheet-shaped spiral heat dissipation tube (14) extends to the outside of the second heat exchange barrel (13) and extends into the combustion chamber (15). A first tail gas pipe (17) is fixedly connected between the lower end of the outer wall of the second heat exchange barrel (13) and the upper end of the outer wall of the combustion chamber (15). The first tail gas pipe (17) is located outside the third internal circulation tube (16). The inner diameter of the first tail gas pipe (17) is greater than the outer diameter of the third internal circulation tube (16). The top wall of the second heat exchange barrel (13) is fixedly connected to the combustion chamber (15). A second tail gas pipe (18) is connected, a fourth internal circulation pipe (19) is fixedly connected inside the combustion chamber (15), one end of the fourth internal circulation pipe (19) extends outside the combustion chamber (15) and is fixedly connected to a blower (20), the blower (20) is fixedly connected to the base (1), the output end of the blower (20) is fixedly connected to the middle part of the feed closed rotating sleeve (4), the bottom of the combustion chamber (15) is fixedly connected to a first air intake pipe (21), one end of the first air intake pipe (21) away from the combustion chamber (15) extends into the first heat exchange barrel (9) and is fixedly connected to the lower end of the first sheet-shaped spiral heat dissipation pipe (10), the upper end of the first sheet-shaped spiral heat dissipation pipe (10) is fixedly connected to a second air intake pipe (22),The upper end of the second air inlet pipe (22) extends to the outside of the first heat exchange barrel (9), and a plurality of equally spaced serpentine heating pipes (23) are fixedly connected between the third internal circulation pipe (16) and the fourth internal circulation pipe (19), and the serpentine heating pipes (23) are all located in the combustion chamber (15), and a natural gas stove (24) located below the plurality of serpentine heating pipes (23) is fixedly connected in the combustion chamber (15).

2. The energy-saving gas dryer with a tail heat recovery structure according to claim 1 is characterized in that: The exhaust mechanism comprises a dehumidifying fan (42), which is located inside the exhaust barrel (6) and below the connection between the exhaust barrel (6) and the first internal circulation pipe (7). The rotating shaft of the dehumidifying fan (42) is rotatably connected to the top wall of the exhaust barrel (6), and the upper end of the rotating shaft of the dehumidifying fan (42) extends outside the exhaust barrel (6).

3. The energy-saving gas dryer with a tail heat recovery structure according to claim 1 is characterized in that: The first transmission mechanism comprises a first bevel gear (43), the first bevel gear (43) is fixedly connected to the upper end of the rotating shaft of the dehumidifying fan (42), the first bevel gear (43) is meshed with a second bevel gear (44), the second bevel gear (44) is rotatably connected to the outer wall of the discharge sealing rotating sleeve (5), the rotating shaft of the second bevel gear (44) is fixedly connected to a first gear (45), the first gear (45) is meshed with a second gear (46), the second gear (46) is rotatably connected to the outer wall of the sand drying cylinder (2), the outer wall of the rotating shaft of the second gear (46) is fixedly connected to a one-way bearing (47), the outer ring of the one-way bearing (47) is fixedly connected to a third gear (48), the third gear (48) is meshed with a fourth gear (49), and the fourth gear (49) is fixedly sleeved on the outer side of the sand drying cylinder (2).

4. The energy-saving gas dryer with a tail heat recovery structure according to claim 1 is characterized in that: A spray mechanism for removing dust from the bottom end of the first inner circulation pipe (7) is provided between the first heat exchange barrel (9) and the second heat exchange barrel (13), the spray mechanism comprising a sedimentation intercommunication mechanism and two water cylinders (25), the two water cylinders (25) being fixedly connected to the middle of the top wall of the first heat exchange barrel (9) and the second heat exchange barrel (13), respectively, the upper ends of the two water cylinders (25) respectively extending to the outside of the first heat exchange barrel (9) and the second heat exchange barrel (13) and both being fixedly connected to a first drainage pipe (26), the first drainage pipe (26) being installed with a first one-way valve (27) ), one end of the two first drainage pipes (26) away from the water cylinder (25) is fixedly connected to a second drainage pipe (28), one end of the second drainage pipe (28) extends to the bottom of the first internal circulation pipe (7) and is fixedly connected to a spray head (29); the lower ends of the two water cylinders (25) extend to the bottom of the first sheet-shaped spiral heat dissipation pipe (10) and the second sheet-shaped spiral heat dissipation pipe (14) respectively and are fixedly connected to a water pumping pipe (30), the lower ends of the two water pumping pipes (30) extend to the bottom of the first water storage barrel (8) and the second water storage barrel (12) respectively, and the water pumping pipe (30) ) are both installed with a second one-way valve (31), a piston (32) is slidably connected in the water cylinder (25), a third one-way valve (33) is installed on the piston (32), the upper end of the piston (32) is fixedly connected with a slide rod (34), the upper end of the slide rod (34) extends to the top of the water cylinder (25) and is fixedly connected with a transmission flat circle (35), the inner sides of the two transmission flat circles (35) are respectively movably connected with a first eccentric shaft (36) and a second eccentric shaft (37), the first eccentric shaft (36) and the second eccentric shaft (37) have the same structure and size The first eccentric shaft (36) and the second eccentric shaft (37) are oriented in opposite directions. A transmission shaft (38) is fixedly connected between the first eccentric shaft (36) and the second eccentric shaft (37). The transmission shaft (38) is rotatably connected to the discharge sealing rotating sleeve (5). A second transmission mechanism for driving the transmission shaft (38) to rotate is provided between the transmission shaft (38) and the first transmission mechanism. The sedimentation intercommunication mechanism can separate clean water and sewage in the first water storage barrel (8), and can intercommunication the clean water in the first water storage barrel (8) with the clean water in the second water storage barrel (12).

5. The energy-saving gas dryer with a tail heat recovery structure according to claim 4 is characterized in that: The sedimentation intercommunication mechanism comprises a sedimentation separation cylinder (39), a conical guide plate (41) and a sewage pipe (54); the sedimentation separation cylinder (39) is fixedly connected to the middle part of the inner bottom wall of the first water storage barrel (8); the sedimentation separation cylinder (39) is arranged on the outer side of the water suction pipe (30) located in the first water storage barrel (8); the height of the upper port of the sedimentation separation cylinder (39) is higher than the height of the lower port of the water suction pipe (30); one side of the sedimentation separation cylinder (39) is fixedly connected with a connecting pipe (40); the connecting pipe (40) extends from one end away from the sedimentation separation cylinder (39) to the first water storage barrel (8); ) outside and fixedly connected with the second water storage barrel (12); the conical guide plate (41) is fixedly sleeved on the outside of the water suction pipe (30) located in the first water storage barrel (8), the conical guide plate (41) is located directly above the sedimentation separation cylinder (39), the maximum diameter of the conical guide plate (41) is smaller than the inner diameter of the first water storage barrel (8) and larger than the outer diameter of the sedimentation separation cylinder (39); the upper end of the sewage pipe (54) is fixedly connected with the bottom wall of the first water storage barrel (8), the sewage pipe (54) is located outside the sedimentation separation cylinder (39), and a sewage valve (55) is provided on the sewage pipe (54).

6. The energy-saving gas drying machine with a tail heat recovery structure according to claim 5 is characterized in that: The second transmission mechanism comprises a third bevel gear (50), the third bevel gear (50) is fixedly connected to the outer wall of the transmission shaft (38), the third bevel gear (50) is meshed with a fourth bevel gear (51), and the fourth bevel gear (51) is fixedly connected to the rotating shaft of the second bevel gear (44).

7. The energy-saving gas dryer with a tail heat recovery structure according to claim 1 is characterized in that: An end of the second air intake pipe (22) away from the first sheet-like spiral heat dissipation pipe (10) is rotatably connected to an air intake fan (52), and a rotating shaft of the air intake fan (52) extends outside the second air intake pipe (22) and is fixedly connected to the rotating shaft of the first eccentric shaft (36). An end of the second tail pipe (18) away from the second heat exchange barrel (13) is rotatably connected to an exhaust fan (53), and a rotating shaft of the exhaust fan (53) extends outside the second tail pipe (18) and is fixedly connected to the rotating shaft of the second eccentric shaft (37).

8. A drying method of an energy-saving gas dryer with a tail heat recovery structure, using the energy-saving gas dryer with a tail heat recovery structure according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: Step 1: The sand drying cylinder (2) filled with a proper amount of sand is driven to rotate by the driving device (3), and the sand drying cylinder (2) drives the exhaust mechanism to exhaust air through the first transmission mechanism; Step 2: Start the blower (20). Under the joint action of the blower (20) and the exhaust mechanism, the drying airflow in the sand drying cylinder (2) is sequentially transported to the discharge closed rotary sleeve (5), the exhaust barrel (6), the first internal circulation pipe (7), the first heat exchange barrel (9), the second internal circulation pipe (11), the second sheet-shaped spiral heat dissipation pipe (14), the third internal circulation pipe (16), the serpentine heating pipe (23) and the fourth internal circulation pipe (19), and finally returns to the sand drying cylinder (2), thereby realizing the internal circulation of the drying air. Step 3: The natural gas stove (24) is ignited, and the external cold air is transported to the bottom of the natural gas stove (24) through the second air intake pipe (22), the first sheet-shaped spiral heat dissipation pipe (10), and the first air intake pipe (21) in sequence, and the exhaust gas from the combustion of the natural gas stove (24) is discharged through the first exhaust pipe (17), the second sheet-shaped spiral heat dissipation pipe (14), and the second exhaust pipe (18) in sequence; the external cold air is condensed and dehydrated through the first sheet-shaped spiral heat dissipation pipe (10) and the internal circulation air in the first heat exchange barrel (9), the exhaust gas in the second heat exchange barrel (13) preheats the internal circulation air in the second sheet-shaped spiral heat dissipation pipe (14), and the natural gas stove (24) heats the internal circulation air in the serpentine heating pipe (23); Step 4: At the same time, the spray mechanism uses the condensed water in the first heat exchange barrel (9) and the second heat exchange barrel (13) to continuously spray and remove dust from the internal circulating air; Step 5: After repeated dust removal, blowing, preheating and heating, the internal circulating air can continue to dry the sand rolling in the sand drying cylinder (2) in an efficient and energy-saving manner.

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