A double-drum inner wall heat exchange steam dryer

Abstract

The present invention relates to a double-drum inner wall heat exchange type steam dryer, comprising a base frame, an inner drum and an outer drum coaxially installed on the base frame, a central rotating shaft coaxially installed in the inner drum, a steam rotary joint and a rotary ventilation clamp installed at the same end of the central rotating shaft, and a driving device for driving the drum to rotate. Firstly, the inner drum and the outer drum of the present invention are fixed by long bolts, which is convenient for installation and adjustment, and improves the concentricity problem between the inner drum and the outer drum to a certain extent, so that the operation of the whole equipment is more stable. Secondly, a beating hammer and a crushing rib are arranged inside the inner drum, so that the wet and sticky materials are fully broken up for easy drying, and the beating hammer continuously strikes the drum wall as the inner drum rotates, so that the materials stuck on the drum wall are separated from it, thereby ensuring the drying quality. Furthermore, the inlet and outlet ends of the drying steam of the whole dryer are concentrated at one end of the central rotating shaft, which is convenient for installation and centralized collection of condensed water.

Description

Technical Field

[0001] The invention relates to the technical field of drying equipment, in particular to a double-drum inner wall heat exchange type steam dryer. Background Art

[0002] In the dryers in the prior art, drum dryers are generally used. In order to achieve the purpose of drying, the drying equipment generally directly introduces hot air into the drum as a drying heat source, that is, the material is turned and scattered in the drum and comes into contact with the hot air to remove moisture to achieve drying. Since the drying equipment is in a state of feeding and discharging, most of the heat of the hot air may be lost before being used in the drying process, resulting in excessive energy consumption, which seriously increases production costs and causes energy waste. At the same time, in order to extend the drying time of the material, the dryer is often set to a multi-layer drum, which makes it difficult to install between the multi-layer drums and is not conducive to The most critical issue for later maintenance and overhaul is that it is difficult to ensure the concentricity between the multiple layers of drums during installation, which causes the dryer to run extremely unsteadily or even vibrate, increasing the wear of the equipment and shortening its service life. Also, when the material is first put into the dryer, it is very humid and easily sticks to the inner wall of the drum, making it difficult to handle. At the same time, in order to improve the efficiency of energy utilization, a heat dissipation pipe for passing steam is arranged on the inner wall of the drying drum. Since the drying drum is always rotating, how to connect the steam to the heat dissipation pipe on the inner wall of the drying drum and how to centrally handle the condensed water formed by the steam in the heat dissipation pipe are technical problems that technical personnel in this field need to solve urgently. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a double-drum inner wall heat exchange type steam dryer.

[0004] The specific contents are as follows: A double-drum inner wall heat exchange steam dryer, comprising a base frame, an inner drum and an outer drum coaxially mounted on the base frame, a central rotating shaft coaxially mounted in the inner drum, a steam rotary joint and a rotary ventilation clamp mounted at the same end of the central rotating shaft, and a driving device for driving the drum to rotate, wherein the characteristics are:

[0005] The inner drum and the outer drum are both cylindrical, the inner drum is coaxially sleeved inside the outer drum and fixed by long bolts arranged along the circumferential direction, and the long bolts penetrate the inner drum body and the outer drum body in turn along the radial outward direction of the inner drum, and are tightened by nuts on the outside of the outer drum, the outer circumferential surface and the inner circumferential surface of the inner drum are provided with a plurality of semicircular heat dissipation tubes evenly arranged along the circumferential direction, each heat dissipation tube on the inner drum is arranged along the busbar direction of the inner drum and is sealed and fixed to the body of the inner drum, the two ends of each heat dissipation tube on the inner drum are respectively connected to the same connecting pipe A, the connecting pipe A is a closed annular cylinder fixed on the body of the inner drum, the inner circumferential surface of the outer drum is provided with a plurality of semicircular heat dissipation tubes evenly arranged along the circumferential direction, each heat dissipation tube on the outer drum is arranged along the busbar direction of the outer drum and is sealed and fixed to the body of the outer drum Sealed and fixed, the two ends of each heat dissipation tube on the outer drum are respectively connected with the same connecting tube B, which is a closed semi-circular ring cylinder fixed on the inner wall of the outer drum, and a guide tube connecting the two is arranged between the connecting tube A at the left end of the inner drum and the corresponding connecting tube B at the same end, and a plurality of hammers arranged along the circumferential direction are hinged on the inner wall of the left half of the inner drum, and the hinge axis of each hammer is consistent with the generatrix direction of the inner drum, and a plurality of inner lifting plates arranged along the circumferential direction are fixed on the inner wall of the right half of the inner drum, and each inner lifting plate is fixed to the heat dissipation tube on the inner circumferential surface of the inner drum and extends toward the center of the inner drum, and a spiral crushing rib coaxial with the inner drum is fixed on the top of the inner lifting plate, and outer lifting plates are fixed on the heat dissipation tubes on the outer circumferential surface of the inner drum and the heat dissipation tubes on the inner circumferential surface of the outer drum, and the outer lifting plates are flat or curved.

[0006] The central rotating shaft is coaxially arranged inside the inner drum, and the two ends of the central rotating shaft extend out of the inner drum respectively and are installed on the bearing seats at the corresponding ends. The central rotating shaft includes a central cylindrical heat dissipation cylinder and a left supporting shaft and a right supporting shaft at both ends. The left supporting shaft and the right supporting shaft are respectively installed on the bearing seats at the corresponding ends. The left supporting shaft and the right supporting shaft are coaxially sealed and fixed with the corresponding ends of the heat dissipation cylinder through at least two inner supporting plates. The interior of the supporting right shaft is provided with a left-to-right through steam inlet channel, which is connected with the interior of the central rotating shaft heat dissipation cylinder. The interior of the supporting right shaft is also provided with a mutually independent steam exhaust channel A and a steam exhaust channel B. The inner port of the steam exhaust channel A is connected with the space between the two inner supporting plates inside the heat dissipation cylinder at this end, and an exhaust hole is provided on the inner inner supporting plate.

[0007] The rotating ventilation clamp is clamped on the right shaft of the support of the central rotating shaft, and a sliding bearing is installed between the rotating ventilation clamp and the right shaft of the support, and the rotating ventilation clamp and the right shaft of the support can rotate relative to each other. An air inlet groove and an air outlet groove are provided on the rotating ventilation clamp, and the air inlet groove and the air outlet groove are parallel and both are closed annular, wherein the air inlet groove is connected with the steam inlet channel through the diverter hole on the right shaft of the support, and the air inlet groove is connected with the connecting pipe A at this end through the external steam inlet pipe, and the air outlet groove is connected with the inner port of the steam discharge channel B, and the air outlet groove is connected with the connecting pipe B at this end through the external steam outlet pipe, and the rotating ventilation clamp rotates simultaneously with the inner layer roller;

[0008] The end of the steam rotary joint is provided with a docking cylinder extending outward, and the docking cylinder is provided with an air inlet hole that passes through the steam rotary joint on the left and right and an exhaust blind hole of the cylindrical interlayer, and an exhaust pipe connected to the exhaust blind hole is provided on the side of the steam rotary joint, the docking cylinder of the steam rotary joint is docked with the outer end of the supporting right shaft of the central rotating shaft, and is fixed by a connecting flange, and the steam rotary joint and the supporting right shaft can rotate relative to each other, the end face of the docking cylinder is provided with a docking step corresponding to and matching the outer end face of the supporting right shaft, and the air inlet hole on the steam rotary joint is connected with the steam inlet channel inside the supporting right shaft, and the steam exhaust channel A and steam exhaust channel B inside the supporting right shaft are both connected with the exhaust blind hole.

[0009] Preferably, the base frame is fixed to the ground by pads, and is provided with two pairs of rollers which respectively match the two annular rollers on the outer drum, and the annular rollers on the outer drum are installed on the base frame tangent to the rollers, and front end covers and rear end covers which match the two ends of the outer drum are provided at both ends of the base frame, and the rear end cover is provided with a discharge port which is connected to the outer drum.

[0010] Preferably, the driving device is fixed on the ground, and includes a base, a driving motor fixed on the base, a reduction gear and a driving gear. The output shaft of the driving motor is coaxially fixed with the input shaft of the reduction gear. The output shaft of the reduction gear is coaxially fixed with a driving gear that matches and meshes with an annular rack. The annular rack is coaxially fixed on the outer circumferential surface of the outer roller.

[0011] Preferably, the bearing seats at both ends of the central rotating shaft are respectively fixed on the base frame and the front end cover, a driving pulley is coaxially fixed to the outer end of the central rotating shaft supporting the left shaft, and a plurality of crushing rakes are fixed on the outer circumferential surface of the heat dissipation cylinder of the central rotating shaft.

[0012] Preferably, a pushing spiral is provided on the inner circumferential surface of the inner layer roller and the inner circumferential surface of the outer layer roller.

[0013] Preferably, the striking hammer comprises at least three parallel steel plates, and a plurality of connecting rods which are parallel to each other and penetrate the connecting steel plates, all the connecting rods are fixed on a hinge shaft, the hinge shaft is rotatably connected to a mounting sleeve, the mounting sleeve is fixed on the cylinder body of the inner drum, and the swing contact points of the striking hammer are all located on the cylinder wall between the corresponding heat dissipation tubes.

[0014] Preferably, at least three sliding bearings are provided between the rotating ventilation clamp and the supporting right shaft, and axially positioning retaining frames are installed between the sliding bearings. Retaining rings for axially positioning the sliding bearings on both sides are fixed by screws on both sides of the rotating ventilation clamp.

[0015] Preferably, the rotary ventilation clamp comprises two correspondingly buckled semicircular clamp monomers.

[0016] Preferably, the sliding bearing and the docking cylinder at the end of the steam rotary joint are both made of brass.

[0017] Preferably, the connecting flange is sleeved in a mounting groove on the outer circumferential surface of the docking cylinder, and the connecting flange is fixed to the outer end surface of the supporting right shaft by bolts.

[0018] The beneficial technical effects of the present invention are as follows: the present invention is a double-drum inner wall heat exchange steam dryer. First, the inner drum and the outer drum of the present invention are fixed by long bolts, which is convenient for installation and adjustment, and improves the concentricity problem between the inner drum and the outer drum to a certain extent, so that the operation of the whole equipment is more stable. Secondly, a beating hammer and a crushing rib are arranged inside the inner drum, so that the wet and sticky materials are fully broken up for easy drying. At the same time, the inner lifting plate and the outer lifting plate are fixed on the heat dissipation pipe, and the heat on the heat dissipation pipe can be transferred to the inner lifting plate and the outer lifting plate, so as to increase the heat dissipation area and the drying area contacted by the material, and improve the drying effect of the material. Moreover, the beating hammer continuously strikes the drum wall with the rotation of the inner drum, so that the material adhered to the drum wall is separated from it, and the drying quality of the material is ensured. Furthermore, the inlet and outlet ends of the drying steam of the whole dryer are concentrated at one end of the central rotating shaft, which is convenient for installation and centralized collection of condensed water. Finally, a heat dissipation cylinder passing steam is arranged on the central rotating shaft, so as to realize double drying and heating of the material, improve the drying quality of the material, and shorten the drying time of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a double-drum inner wall heat exchange type steam dryer;

[0020] Figure 2 It is a front cross-sectional view of a double-drum inner wall heat exchange type steam dryer;

[0021] Figure 3 for Figure 2 A partial enlarged schematic diagram of the installation position of the right shaft of the middle support;

[0022] Figure 4 for Figure 2 A is an enlarged schematic diagram;

[0023] Figure 5 for Figure 2 A magnified schematic diagram of B;

[0024] Figure 6 for Figure 2 Cross-section view in the CC direction;

[0025] Figure 7 for Figure 2 Cross-section along the mid-DD direction;

[0026] Figure 8 This is a cross-sectional view of the steam rotary joint and the rotary ventilation clamp installed on the right support shaft;

[0027] Fig. 9 for Figure 8 Middle E is an enlarged schematic diagram;

[0028] Fig.10 for Fig. 9 Cross-section view in the FF direction;

[0029] Fig.11 for Fig. 9 Cross-section along the mid-GG direction;

[0030] Fig.12 for Figure 8 A magnified schematic diagram of H in the middle;

[0031] Fig.13 It is the front view of the steam rotary joint;

[0032] Fig.14 for Fig.13 Sectional view in the middle II direction;

[0033] Fig.15 It is the front view of the striking hammer;

[0034] Fig.16 for Fig.15 Left view of

[0035] In the figure: 12. Annular roller, 13. Annular rack, 14. Rear cover, 15. Front cover, 16. Pad, 17. Base, 18. Driving motor, 19. Reducer, 20. Driving gear, 21. Base frame, 22. Driving pulley, 23. Discharge port, 24. Outer roller, 25. Inner roller, 26. Heat dissipation pipe, 27. Long bolt, 28. Steam inlet pipe, 29. Steam outlet pipe, 30. Support left shaft, 31. Heat dissipation cylinder, 32. Crushing rake, 33. Beating hammer, 331. Steel plate, 332. Connecting rod, 333. Articulated shaft, 334. Mounting sleeve, 34. Crushing rib, 35. Inner lifting plate, 36. Support right shaft, 37. Bearing seat installed on the base frame, 38. Steam rotary joint, 381. docking cylinder, 3811. mounting groove, 3812. docking step, 282. air inlet, 383. exhaust blind hole, 384. exhaust pipe, 39. rotary ventilation clamp, 391. air outlet groove, 392. air inlet groove, 393. retaining ring, 394. screw, 395. sliding bearing, 396. retaining frame, 397. diversion hole, 40. connecting pipe A, 41. connecting pipe B, 42. inner support plate, 43. exhaust hole, 44. bearing seat installed on the front cover, 45. guide pipe, 46. nut, 47. external material plate, 48. steam discharge channel B, 49. steam inlet channel, 50. steam discharge channel A, 51. connecting flange, 52. bolt. DETAILED DESCRIPTION

[0036] Example 1, see Figure 1-16 A double-drum inner wall heat exchange type steam dryer comprises a base frame, an inner drum and an outer drum coaxially mounted on the base frame, a central rotating shaft coaxially mounted in the inner drum, a steam rotary joint and a rotary ventilation clamp mounted at the same end of the central rotating shaft, and a driving device for driving the drum to rotate;

[0037] The inner drum and the outer drum are both cylindrical, the inner drum is coaxially sleeved inside the outer drum and fixed by long bolts arranged along the circumferential direction, and the long bolts penetrate the inner drum body and the outer drum body in turn along the radial outward direction of the inner drum, and are tightened by nuts on the outside of the outer drum, the outer circumferential surface and the inner circumferential surface of the inner drum are provided with a plurality of semicircular heat dissipation tubes evenly arranged along the circumferential direction, each heat dissipation tube on the inner drum is arranged along the busbar direction of the inner drum and is sealed and fixed to the body of the inner drum, the two ends of each heat dissipation tube on the inner drum are respectively connected to the same connecting pipe A, the connecting pipe A is a closed annular cylinder fixed on the body of the inner drum, the inner circumferential surface of the outer drum is provided with a plurality of semicircular heat dissipation tubes evenly arranged along the circumferential direction, each heat dissipation tube on the outer drum is arranged along the busbar direction of the outer drum and is sealed and fixed to the body of the outer drum Sealed and fixed, the two ends of each heat dissipation tube on the outer drum are respectively connected with the same connecting tube B, which is a closed semi-circular ring cylinder fixed on the inner wall of the outer drum, and a guide tube connecting the two is arranged between the connecting tube A at the left end of the inner drum and the corresponding connecting tube B at the same end, and a plurality of hammers arranged along the circumferential direction are hinged on the inner wall of the left half of the inner drum, and the hinge axis of each hammer is consistent with the generatrix direction of the inner drum, and a plurality of inner lifting plates arranged along the circumferential direction are fixed on the inner wall of the right half of the inner drum, and each inner lifting plate is fixed to the heat dissipation tube on the inner circumferential surface of the inner drum and extends toward the center of the inner drum, and a spiral crushing rib coaxial with the inner drum is fixed on the top of the inner lifting plate, and outer lifting plates are fixed on the heat dissipation tubes on the outer circumferential surface of the inner drum and the heat dissipation tubes on the inner circumferential surface of the outer drum, and the outer lifting plates are flat or curved.

[0038] The central rotating shaft is coaxially arranged inside the inner drum, and the two ends of the central rotating shaft extend out of the inner drum respectively and are installed on the bearing seats at the corresponding ends. The central rotating shaft includes a central cylindrical heat dissipation cylinder and a left supporting shaft and a right supporting shaft at both ends. The left supporting shaft and the right supporting shaft are respectively installed on the bearing seats at the corresponding ends. The left supporting shaft and the right supporting shaft are coaxially sealed and fixed with the corresponding ends of the heat dissipation cylinder through at least two inner supporting plates. The interior of the supporting right shaft is provided with a left-to-right through steam inlet channel, which is connected with the interior of the central rotating shaft heat dissipation cylinder. The interior of the supporting right shaft is also provided with a mutually independent steam exhaust channel A and a steam exhaust channel B. The inner port of the steam exhaust channel A is connected with the space between the two inner supporting plates inside the heat dissipation cylinder at this end, and an exhaust hole is provided on the inner inner supporting plate.

[0039] The rotating ventilation clamp is clamped on the right shaft of the support of the central rotating shaft, and a sliding bearing is installed between the rotating ventilation clamp and the right shaft of the support, and the rotating ventilation clamp and the right shaft of the support can rotate relative to each other. An air inlet groove and an air outlet groove are provided on the rotating ventilation clamp, and the air inlet groove and the air outlet groove are parallel and both are closed annular, wherein the air inlet groove is connected with the steam inlet channel through the diverter hole on the right shaft of the support, and the air inlet groove is connected with the connecting pipe A at this end through the external steam inlet pipe, and the air outlet groove is connected with the inner port of the steam discharge channel B, and the air outlet groove is connected with the connecting pipe B at this end through the external steam outlet pipe, and the rotating ventilation clamp rotates simultaneously with the inner layer roller;

[0040] The end of the steam rotary joint is provided with a docking cylinder extending outward, and the docking cylinder is provided with an air inlet hole that passes through the steam rotary joint on the left and right and an exhaust blind hole of the cylindrical interlayer, and an exhaust pipe connected to the exhaust blind hole is provided on the side of the steam rotary joint, the docking cylinder of the steam rotary joint is docked with the outer end of the supporting right shaft of the central rotating shaft, and is fixed by a connecting flange, and the steam rotary joint and the supporting right shaft can rotate relative to each other, the end face of the docking cylinder is provided with a docking step corresponding to and matching the outer end face of the supporting right shaft, and the air inlet hole on the steam rotary joint is connected with the steam inlet channel inside the supporting right shaft, and the steam exhaust channel A and steam exhaust channel B inside the supporting right shaft are both connected with the exhaust blind hole.

[0041] The base frame is fixed to the ground by pads, and is provided with two pairs of rollers which match the two annular rollers on the outer drum respectively. The annular rollers on the outer drum are installed on the base frame tangent to the rollers, and front end covers and rear end covers which match the two ends of the outer drum are provided at both ends of the base frame respectively, and the rear end cover is provided with a discharge port which is connected to the outer drum.

[0042] The driving device is fixed on the ground, and includes a base, a driving motor fixed on the base, a reduction gear and a driving gear. The output shaft of the driving motor is coaxially fixed with the input shaft of the reduction gear. The output shaft of the reduction gear is coaxially fixed with a driving gear that matches and meshes with an annular rack. The annular rack is coaxially fixed on the outer circumferential surface of the outer roller.

[0043] The bearing seats at both ends of the central rotating shaft are respectively fixed on the base frame and the front end cover, the outer end of the central rotating shaft supporting the left shaft is coaxially fixed with a driving pulley, and a plurality of crushing rakes are fixed on the outer circumferential surface of the heat dissipation cylinder of the central rotating shaft.

[0044] The inner circumference of the inner drum and the inner circumference of the outer drum are both provided with a push screw. Since the push screw is a common component in the dryer in the field, the specific structural form of the push screw can refer to the Chinese invention (patent number: ZL200620031704.6, patent name: single-stage drying drum and multi-stage drying drum and new high-humidity material dryer).

[0045] The striking hammer includes at least three parallel steel plates and a plurality of connecting rods which are parallel to each other and penetrate the connecting steel plates. All the connecting rods are fixed on a hinge shaft, which is rotatably connected to a mounting sleeve, which is fixed on the cylinder body of the inner drum. The swinging contact points of the striking hammer are all located on the cylinder walls between the corresponding heat dissipation tubes to prevent the striking hammer from hitting the heat dissipation tubes.

[0046] At least three sliding bearings are arranged between the rotating ventilation clamp and the supporting right shaft, and axially positioned retaining frames are installed between the sliding bearings. Snap rings for axially positioning the sliding bearings on both sides are fixed by screws on both sides of the rotating ventilation clamp.

[0047] The rotary ventilation clamp comprises two correspondingly buckled semicircular clamp monomers, which are convenient for installation and disassembly.

[0048] The sliding bearing and the butt-jointed cylinder at the end of the steam rotary joint are both made of brass, which has self-lubricity.

[0049] The connecting flange is sleeved in the mounting groove on the outer circumferential surface of the docking cylinder, and the connecting flange is fixed on the outer end surface of the supporting right shaft by bolts.

[0050] The use process and principle of the present invention:

[0051] The air inlet of the steam rotary joint is connected to the steam source, and the exhaust pipe of the steam rotary joint is connected to the collecting cylinder. The hot steam enters the steam inlet channel supporting the right shaft through the air inlet of the steam rotary joint, and then a part of the steam directly enters the heat dissipation cylinder, and then enters the steam exhaust channel A through the exhaust hole, and is finally discharged from the exhaust pipe of the steam rotary joint. Another part of the steam passes through the rotating ventilation clamp and the steam inlet pipe, and then enters the connecting pipe A and all the heat dissipation pipes on the inner drum. The steam enters the heat dissipation pipe of the outer drum from the guide pipe at the other end of the inner drum, and finally enters the steam exhaust channel B through the connecting pipe B and the steam outlet pipe, and is discharged through the exhaust pipe of the steam rotary joint. The material is added into the inner drum from one end, and gradually rolls forward under the action of the pushing spiral as the drum rotates, and is pushed, dried and broken up at the same time, and enters the outer drum from the other end of the inner drum, and finally enters the discharge port through the outer drum for discharge. The drum and the outer drum are fixed by long bolts, which is convenient for installation and adjustment. It improves the concentricity problem between the inner drum and the outer drum to a certain extent, making the operation of the whole equipment more stable. Secondly, a beating hammer and a crushing rib are arranged inside the inner drum, so that the wet and sticky materials are fully broken up for drying. At the same time, the inner and outer lifting plates are fixed with heat pipes, and the heat on the heat pipes can be transferred to the inner and outer lifting plates, thereby increasing the heat dissipation area and the drying area contacted by the materials, and improving the drying effect of the materials. Moreover, the beating hammer continuously strikes the drum wall as the inner drum rotates, so that the materials stuck on the drum wall are separated from it, thereby ensuring the drying quality of the materials. Furthermore, the inlet and outlet ends of the drying steam of the whole dryer are concentrated at one end of the central rotating shaft, which is convenient for installation and centralized collection of condensed water. Finally, a heat dissipation cylinder passing steam is arranged on the central rotating shaft, so as to realize double drying and heating of the materials, improve the drying quality of the materials, and shorten the drying time of the materials.

Claims

1. A double-drum inner wall heat exchange steam dryer, comprising a base frame, an inner drum and an outer drum coaxially mounted on the base frame, a central rotating shaft coaxially mounted in the inner drum, a steam rotary joint and a rotary ventilation hoop mounted at the same end of the central rotating shaft, and a driving device for driving the drum to rotate, wherein: The inner drum and the outer drum are both cylindrical, the inner drum is coaxially sleeved inside the outer drum and fixed by long bolts arranged along the circumferential direction, and the long bolts penetrate the inner drum body and the outer drum body in turn along the radial outward direction of the inner drum, and are tightened by nuts on the outside of the outer drum, the outer circumferential surface and the inner circumferential surface of the inner drum are provided with a plurality of semicircular heat dissipation tubes evenly arranged along the circumferential direction, each heat dissipation tube on the inner drum is arranged along the busbar direction of the inner drum and is sealed and fixed to the body of the inner drum, the two ends of each heat dissipation tube on the inner drum are respectively connected to the same connecting pipe A, the connecting pipe A is a closed annular cylinder fixed on the body of the inner drum, the inner circumferential surface of the outer drum is provided with a plurality of semicircular heat dissipation tubes evenly arranged along the circumferential direction, each heat dissipation tube on the outer drum is arranged along the busbar direction of the outer drum and is sealed and fixed to the body of the outer drum Sealed and fixed, the two ends of each heat dissipation tube on the outer drum are respectively connected with the same connecting tube B, which is a closed semi-circular ring cylinder fixed on the inner wall of the outer drum, and a guide tube connecting the two is arranged between the connecting tube A at the left end of the inner drum and the corresponding connecting tube B at the same end, and a plurality of hammers arranged along the circumferential direction are hinged on the inner wall of the left half of the inner drum, and the hinge axis of each hammer is consistent with the generatrix direction of the inner drum, and a plurality of inner lifting plates arranged along the circumferential direction are fixed on the inner wall of the right half of the inner drum, and each inner lifting plate is fixed to the heat dissipation tube on the inner circumferential surface of the inner drum and extends toward the center of the inner drum, and a spiral crushing rib coaxial with the inner drum is fixed on the top of the inner lifting plate, and outer lifting plates are fixed on the heat dissipation tubes on the outer circumferential surface of the inner drum and the heat dissipation tubes on the inner circumferential surface of the outer drum, and the outer lifting plates are flat or curved. The central rotating shaft is coaxially arranged inside the inner drum, and the two ends of the central rotating shaft extend out of the inner drum respectively and are installed on the bearing seats at the corresponding ends. The central rotating shaft includes a central cylindrical heat dissipation cylinder and a left supporting shaft and a right supporting shaft at both ends. The left supporting shaft and the right supporting shaft are respectively installed on the bearing seats at the corresponding ends. The left supporting shaft and the right supporting shaft are coaxially sealed and fixed with the corresponding ends of the heat dissipation cylinder through at least two inner supporting plates. The interior of the supporting right shaft is provided with a left-to-right through steam inlet channel, which is connected with the interior of the central rotating shaft heat dissipation cylinder. The interior of the supporting right shaft is also provided with a mutually independent steam exhaust channel A and a steam exhaust channel B. The inner port of the steam exhaust channel A is connected with the space between the two inner supporting plates inside the heat dissipation cylinder at this end, and an exhaust hole is provided on the inner inner supporting plate. The rotating ventilation clamp is clamped on the right shaft of the support of the central rotating shaft, and a sliding bearing is installed between the rotating ventilation clamp and the right shaft of the support, and the rotating ventilation clamp and the right shaft of the support can rotate relative to each other. An air inlet groove and an air outlet groove are provided on the rotating ventilation clamp, and the air inlet groove and the air outlet groove are parallel and both are closed annular, wherein the air inlet groove is connected with the steam inlet channel through the diverter hole on the right shaft of the support, and the air inlet groove is connected with the connecting pipe A at this end through the external steam inlet pipe, and the air outlet groove is connected with the inner port of the steam discharge channel B, and the air outlet groove is connected with the connecting pipe B at this end through the external steam outlet pipe, and the rotating ventilation clamp rotates simultaneously with the inner layer roller; The end of the steam rotary joint is provided with a docking cylinder extending outward, and the docking cylinder is provided with an air inlet hole that passes through the steam rotary joint on the left and right and an exhaust blind hole of the cylindrical interlayer, and an exhaust pipe connected to the exhaust blind hole is provided on the side of the steam rotary joint, and the docking cylinder of the steam rotary joint is docked with the outer end of the supporting right shaft of the central rotating shaft and fixed by a connecting flange, and the steam rotary joint and the supporting right shaft can rotate relative to each other, and the end face of the docking cylinder is provided with a docking step that matches the outer end face of the supporting right shaft, and the air inlet on the steam rotary joint is connected with the steam inlet channel inside the supporting right shaft, and the steam exhaust channel A and steam exhaust channel B inside the supporting right shaft are both connected with the exhaust blind hole; The striking hammer comprises at least three parallel steel plates, and a plurality of connecting rods which are parallel to each other and penetrate the connecting steel plates. All the connecting rods are fixed on the hinge shaft, which is rotatably connected with the mounting sleeve, which is fixed on the cylinder body of the inner drum, and the swing contact points of the striking hammer are all located on the cylinder wall between the corresponding heat dissipation tubes. At least three sliding bearings are arranged between the rotating ventilation clamp and the supporting right shaft, and axially positioned retaining frames are installed between the sliding bearings. Snap rings for axially positioning the sliding bearings on both sides are fixed by screws on both sides of the rotating ventilation clamp.

2. A double-drum inner wall heat exchange steam dryer according to claim 1, characterized in that: The base frame is fixed to the ground by pads, and is provided with two pairs of rollers which match the two annular rollers on the outer drum respectively. The annular rollers on the outer drum are installed on the base frame tangent to the rollers, and front end covers and rear end covers which match the two ends of the outer drum are provided at both ends of the base frame respectively, and the rear end cover is provided with a discharge port which is connected to the outer drum.

3. A double-drum inner wall heat exchange steam dryer according to claim 2, characterized in that: The driving device is fixed on the ground, and includes a base, a driving motor fixed on the base, a reduction gear and a driving gear. The output shaft of the driving motor is coaxially fixed with the input shaft of the reduction gear. The output shaft of the reduction gear is coaxially fixed with a driving gear that matches and meshes with an annular rack. The annular rack is coaxially fixed on the outer circumferential surface of the outer roller.

4. A double-drum inner wall heat exchange type steam dryer according to claim 2, characterized in that: The bearing seats at both ends of the central rotating shaft are respectively fixed on the base frame and the front end cover, the outer end of the central rotating shaft supporting the left shaft is coaxially fixed with a driving pulley, and a plurality of crushing rakes are fixed on the outer circumferential surface of the heat dissipation cylinder of the central rotating shaft.

5. The double-drum inner wall heat exchange steam dryer according to claim 1 is characterized in that: The inner circumferential surface of the inner layer roller and the inner circumferential surface of the outer layer roller are both provided with pushing spirals.

6. A double-drum inner wall heat exchange type steam dryer according to claim 1, characterized in that: The rotating ventilation clamp comprises two correspondingly buckled semicircular clamp monomers.

7. The double-drum inner wall heat exchange steam dryer according to claim 1 is characterized in that: The sliding bearing and the butt-jointed cylinder at the end of the steam rotary joint are both made of brass.

8. The double-drum inner wall heat exchange type steam dryer according to claim 1 is characterized in that: The connecting flange is sleeved in the mounting groove on the outer circumferential surface of the docking cylinder, and the connecting flange is fixed on the outer end surface of the supporting right shaft by bolts.

Images