CN201137957Y - Rotary air preheater follow-up flexible sealing device - Google Patents

Abstract

The utility model relates to a follow-up flexible sealing device for a rotary air preheater, which belongs to the technical field of heat exchange equipment in a thermal power plant boiler unit, and includes a radial follow-up flexible seal device and an axial follow-up flexible seal. The device, the circumferential follow-up flexible sealing device, install the flexible sealing sheet on the rotor, install the ring track, the flexible sealing sheet is fixedly connected with the rotor, and several fan-shaped plates are connected by flexible plates to form a whole follow-up fan-shaped plate. An ear plate is installed on the upper end of each fan-shaped plate, and the main roller and the spare roller are installed in the middle of the ear plate. The shaft passes through the ear plate, and the cooling hose is connected to one end of the hollow shaft. A high temperature resistant bearing is installed in the center of the roller, and a vent hole is drilled on the hollow shaft. The vent hole is located between the spoke and the dust cover. The flexible follow-up sealing device has a strong ability to automatically compensate for the sealing gap.

Description

Rotary air preheater follow-up flexible sealing device

technical field

The utility model relates to a follow-up flexible sealing device of a rotary air preheater, specifically a follow-up flexible seal device in a rotary air preheater, which belongs to the technology of heat exchange equipment in a boiler unit of a thermal power plant field.

Background technique

The rotary air preheater is a heat exchange device that uses the hot flue gas discharged from the tail of the coal-fired boiler in the thermal power plant to heat the cold air and then enters the boiler to support combustion. It is widely used in modern large-capacity boilers. Due to the rotating parts of the rotary air preheater, there is a gap between the rotor, the fan plate and the rotor shell, and there is a large pressure difference between the air side and the flue gas side of the preheater, which brings the air to The problem of leakage in the flue gas, that is, the problem of air leakage. The air leakage of the rotary air preheater will lead to poor thermal conditions of the unit, accelerate the low-temperature corrosion process, reduce the thermal efficiency of the unit, increase the power consumption of ventilation machinery, reduce the efficiency of the boiler, and then affect the economic benefits of the overall operation of the unit. At present, with the continuous increase of boiler capacity, the rotary air preheater is also getting bigger and bigger, which makes the problems of air leakage more prominent. The air leakage rate of the rotary air preheater is generally required to be no more than 10% in design, but in many practical applications it is 20-30%, sometimes even as high as 40%. The main reason for the large air leakage of the rotary air preheater is the irregular mushroom deformation of the rotor with temperature changes, resulting in excessive gaps between the radial seal and the sector plate, and between the axial seal and the rotor shell. Air leakage rate is an important index to measure the technical level of rotary air preheater. At present, the problem of air leakage is solved by reserving the sealing gap according to the calculated thermal deformation parameters in advance. However, since the thermal deformation of the rotary air preheater is affected by many factors, the calculated thermal deformation parameters are very inaccurate. If the reserved sealing gap is too large, the air leakage during hot operation will be large; if the reserved sealing gap is too small, scratches will occur between the rotor, the casing, and the fan-shaped plate, and the normal operation of the equipment will be affected.

Contents of the invention

In order to overcome the deficiency of the sealing state of the rotary air preheater, the utility model not only has the ability to automatically compensate the sealing gap, but also can effectively and automatically compensate the mushroom deformation caused by the rotary air preheater. The irregular sealing gap changes.

The technical solution of the utility model is to include a radial follow-up flexible sealing device, an axial follow-up flexible sealing device, and a circumferential follow-up flexible sealing device.

The radial follow-up flexible sealing device includes an upper seal and a lower seal. A flexible radial sealing sheet is installed above the rotor rotating around the central axis, and a radial annular track is installed. The upper end of the flexible radial sealing sheet and the upper end of the radial annular track are in the On a horizontal plane, the flexible radial seal is fixedly connected with the rotor, and several fan-shaped plates are connected by flexible plates to form a whole follow-up fan-shaped plate. Ear plates are installed on the upper end of each fan-shaped plate, and main rollers, spare Roller, the shaft is passed through the ear plate, and the cooling hose is connected to one end of the hollow shaft. The internal structure of the main roller and the spare roller is that there are ventilation holes drilled on the spokes of the rollers, and a high-temperature resistant bearing is installed in the center of the rollers. Two dust-proof covers are fixedly installed on the plane. Air outlet holes are drilled on the dust-proof covers, and vent holes are drilled on the hollow shaft. The vent holes are located between the spokes and the dust-proof covers. The diameter of the main roller is 0.1-8 larger than that of the spare roller. mm, the main roller is on the radial circular track, the connecting plate is installed on the fan-shaped plate, the connecting plate is welded at the lower end of the upper center truss, and the flexible connecting plate is connected between the two connecting plates; the flexible connecting plate is installed under the rotor rotating around the central axis. The radial seal is installed with the radial ring track, the lower end of the flexible radial seal and the lower end of the radial ring track are on a horizontal plane, the flexible radial seal is fixedly connected with the rotor, and several fan-shaped plates are connected by a flexible plate to form a whole Follow-up fan-shaped plate, lug plate is installed on the upper end of each fan-shaped plate, main roller and spare roller are installed in the middle of the lug plate, the shaft passes through the lug plate, and the cooling hose is connected to one end of the hollow shaft. The internal structure of the main roller and spare roller is Ventilation holes are drilled on the spokes of the roller, and high-temperature resistant bearings are installed in the center of the roller. Two dust-proof covers are fixedly installed on both sides of the spokes and on the radial plane of the roller. Ventilation hole, the ventilation hole is located between the spoke and the dust cover, the diameter of the main roller is 0.1-8 mm larger than that of the spare roller, the main roller is on the radial circular track, the connecting plate is installed on the fan-shaped plate, and the upper end of the lower center truss is welded and connected The flexible connecting plate is connected between the two connecting plates, the counterweight support rod is welded at the upper end of the lower central truss, and the support rod is welded at the lower end of the fan-shaped plate. The counterweight is installed on the counterweight support rod through a hinge. The other end is connected with the bottom end of the pole through a hinge; the driving wheel is pressed tightly on the radial circular track due to the gravity of the counterweight.

The axial follow-up flexible sealing device is to install a flexible axial sealing sheet on the outside of the rotor, and install an axial annular track. The outer end of the flexible axial sealing sheet and the outer end of the axial annular track are on the same vertical arc surface. Two arc-shaped plates are connected by arc-shaped flexible plates to form an integral arc-shaped follower plate. Ear plates are installed on the outer ends of each arc-shaped plate, and main rollers and spare rollers are installed in the middle of the ear plates. The hose is connected to one end of the hollow shaft. The internal structure of the main roller and the spare roller is that ventilation holes are drilled on the spokes of the rollers. A high temperature resistant bearing is installed in the center of the rollers. Two dustproof covers are fixed on both sides of the spokes and on the radial plane of the rollers. , the air outlet is drilled on the dust cover, and the air hole is drilled on the hollow shaft, the air hole is located between the spoke and the dust cover, the diameter of the main roller is 0.1-8mm larger than that of the spare roller, and the main roller is on the axial circular track , the spring is installed between the arc-shaped plate and the seat frame.

The circumferential flexible follow-up sealing device includes an upper seal and a lower seal. The upper inner side of the rotor shell is welded with a counterweight support rod and an angle-shaped sealing plate. The counterweight support rod and the follow-up hollow shaft are connected by hinges, and the main roller is installed at the lower end of the follow-up hollow shaft. , Spare roller, the cooling hose is connected to one end of the hollow shaft, the internal structure of the main roller and the spare roller is to drill a ventilation hole on the roller spoke, install a high temperature resistant bearing in the center of the roller, and fix it on both sides of the spoke and on the radial plane of the roller Two dust-proof covers, the air outlet hole is drilled on the dust-proof cover, and the air-vent hole is drilled on the follow-up hollow shaft. The air-vent hole is located between the spoke and the dust-proof cover. The inner side of the follow-up hollow shaft is welded with an annular pressure plate, and the annular flexible bypass seal is fixed between each annular pressure plate by bolts. One end of the flexible connecting piece is connected with the angle-shaped sealing plate, and the other end is connected with the annular pressure plate. On the outer side of the moving hollow shaft, the main roller is tightly pressed against the rotor due to the gravity of the counterweight; the inner side of the lower part of the rotor shell is welded with a counterweight support rod and an angular sealing plate, and the counterweight support rod and the follower hollow shaft are connected by a hinge The main roller and the spare roller are installed on the upper end of the follower hollow shaft, and the cooling hose is connected to one end of the follower hollow shaft. The internal structure of the main roller and the spare roller is that there are ventilation holes drilled on the spokes of the rollers, and a high temperature resistant bearing is installed in the center of the rollers. Two dust-proof covers are fixedly installed on both sides of the spokes and on the radial plane of the roller. Air outlet holes are drilled on the dust-proof covers, and vent holes are drilled on the follow-up hollow shaft. The vent holes are located between the spokes and the dust-proof covers. The diameter is 0.1-8 mm larger than the diameter of the spare roller, and the annular pressure plate is welded on the inner side of the hollow shaft. The annular flexible bypass seal is fixed between each annular pressure plate by bolts. One end of the flexible connecting piece is connected with the corner sealing plate, and the other end is It is connected with the annular pressure plate, and the counterweight is welded on the inner side of the follower hollow shaft. Due to the gravity of the counterweight, the main roller is pressed tightly on the rotor.

The beneficial effect of the utility model is: the flexible sealing sheet and the sealing plate of the follow-up flexible sealing device always maintain the best gap, and adapt to the irregular sealing gap caused by the deformation of the rotor mushroom, manufacturing error, rotor shaking, swinging, vibration, etc. The best sealing of the gap during operation of the rotary air preheater is realized, the air leakage is significantly reduced, and the ability of automatically compensating the sealing gap is fully exerted. The air leakage of the utility model is 1/5 to 1 of the traditional seal. /10, the leakage loss is greatly reduced, the structure is simple, and the construction, implementation and transformation are easy.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a diagram of the circular orbit of the rotary air preheater of the utility model with a follow-up flexible sealing device.

Fig. 2 is a semi-sectional view of the structure of the upper part of the follower type fan-shaped plate of the follower type flexible seal device radial seal device of the rotary air preheater of the utility model.

Fig. 3 is a sectional view A-A of the upper part of the radial sealing device of the rotary air preheater of the utility model of the follow-up flexible sealing device of the follow-up fan-shaped plate.

Fig. 4 is a sectional view of the lower follower fan-shaped plate of the radial seal device of the follower type flexible seal device of the rotary air preheater of the utility model.

Fig. 5 is a structural diagram of the axial sealing device of the rotary air preheater of the utility model according to the follow-up flexible sealing device.

Fig. 6 is a cross-sectional view of the axial sealing device B-B of the rotary air preheater of the utility model following the flexible sealing device.

Fig. 7 is a structural diagram of the upper part of the circular sealing device of the rotary air preheater of the utility model with a follow-up flexible sealing device.

Fig. 8 is a structural diagram of the lower part of the bypass sealing device of the rotary air preheater of the utility model according to the follow-up flexible sealing device.

Fig. 9 is an enlarged cross-sectional view of the roller structure of the radial sealing device of the rotary air preheater of the utility model following the flexible sealing device.

In the figure 1, central shaft, 2, rotor, 3, rotor shell, 4, follower fan plate, 5, radial circular track, 6, flexible radial sealing sheet, 7, flexible axial sealing sheet, 8, shaft Circular track, 9, fan-shaped plate, 10, main roller, 11, spare roller, 12, hollow shaft, 13, flexible plate, 14, flexible connecting plate, 15, central truss, 16, pole, 17, counterweight support Rod, 18, counterweight, 19, main roller, 20, spare roller, 21, counterweight support rod, 22, angle sealing plate, 23, follow-up hollow shaft, 24, flexible connecting piece, 25, annular flexible side Road sealing sheet, 26, annular pressure plate, 27, counterweight, 28, fixed shaft, 29 follower shaft, 30, counterweight, 31, main roller, 32, spare roller, 33, hollow shaft, 34, arc Plate, 35, curved flexible plate, 36, spring, 37, seat frame, 38, ear plate, 39, cooling hose, 40, high temperature resistant bearing, 41, dust cover, 42, air outlet, 43, air vent , 44, ventilation hole, 45 connection plate, 46, connection plate, 47, lug plate, 48, cooling hose, 49, high temperature resistant bearing, 50, dust cover, 51, air outlet, 52, ventilation hole, 53, Vent, 54, high temperature resistant bearing, 55, dust cover, 56, vent, 57, vent, 58, cooling hose, 59, vent.

Detailed ways

The rotary air preheater follow-up flexible sealing device includes a radial follow-up flexible seal device; an axial follow-up flexible seal device; and a circumferential follow-up flexible seal device.

The radial follow-up flexible sealing device includes an upper seal and a lower seal, please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4, and Fig. 9. A flexible radial sealing sheet 6, The radial annular track 5 is installed, the upper end of the flexible radial sealing sheet 6 and the upper end of the radial annular track 5 are on a horizontal plane, the flexible radial sealing sheet 6 is fixedly connected with the rotor 2, and several fan-shaped plates 9 are connected by a flexible plate 13 to form a Integral follow-up fan-shaped plate 4, ear plate 38 is installed on the upper end of each fan-shaped plate 9, main roller 10 and spare roller 11 are installed in the middle of ear plate 38, hollow shaft 12 is worn in ear plate 38, and cooling hose 39 is connected to One end of the hollow shaft 12, the internal structure of the main roller 10 and the spare roller 11 is that a ventilation hole 44 is drilled on the roller spoke, a high temperature resistant bearing 40 is installed in the center of the roller, and two dustproof rollers are fixedly installed on both sides of the spoke and on the radial plane of the roller. Cover 41, air outlet 42 is drilled on the dust cover 41, air vent 43 is drilled in the hollow shaft 12, the air vent 43 is located between the spoke and the dust cover, the diameter of the main roller 10 is 0.1-8 mm larger than the diameter of the spare roller 11, The main roller 10 is on the radial circular track 5, the connecting plate 45 is installed on the fan-shaped plate 9, the connecting plate 46 is welded at the lower end of the upper central truss 15, and the flexible connecting plate 14 is connected by bolts between the two connecting plates 45, 46; Under the rotor 2 rotating around the central axis 1, a flexible radial sealing sheet 6 and a radial annular track 5 are installed. The lower end of the flexible radial sealing sheet 6 and the lower end of the radial annular track 5 are on a horizontal plane, and the flexible radial sealing sheet 6 Fixedly connected with the rotor 2, several fan-shaped plates 9 are connected by a flexible plate 13 to form a whole follow-up fan-shaped plate 4, each fan-shaped plate 9 is equipped with an ear plate 38, and the main roller 10 and the spare roller are installed in the middle of the ear plate 38 11. The hollow shaft 12 passes through the ear plate 38, and the cooling hose 39 is connected to one end of the hollow shaft 12. The internal structure of the main roller 10 and the spare roller 11 is to drill a ventilation hole 44 on the spokes of the rollers, and install a high-temperature resistant bearing in the center of the rollers. 40. Two dust-proof covers 41 are fixedly installed on both sides of the spoke and on the radial plane of the roller. The dust-proof cover 41 is drilled with an air outlet 42, and the hollow shaft 12 is drilled with a vent 43. The vent 43 is located between the spoke and the dust-proof Between the covers, the diameter of the main roller 10 is 0.1-8 mm larger than the diameter of the spare roller 11. The main roller 10 is on the radial circular track 5, and the connecting plate 45 is installed on the fan-shaped plate 9, and the connecting plate 46 is welded on the upper end of the lower center truss 15, The flexible connecting plate 14 is connected by bolts between the two connecting plates 45, 46, the counterweight support rod 17 is welded at the upper end of the lower central truss 15, the support rod 16 is welded at the lower end of the fan-shaped plate 9, and the counterweight 18 is installed on the distribution plate through a hinge. On the heavy support bar 17, the other end of the counterweight 18 is connected with the bottom end of the pole 16 by a hinge.

Refer to Figure 1, Figure 5, Figure 6, and Figure 9 for the axial follow-up flexible sealing device. A flexible axial sealing sheet 7 and an axial ring track 8 are installed on the outside of the rotor 2 rotating around the central axis 1. The flexible diameter The outer end of the sealing sheet 7 and the outer end of the axial annular track 8 are on the same vertical arc surface, and several arc plates 34 are connected by arc flexible plates 35 to form an integral arc follower plate, each arc Ear plate 47 is installed on the outer end of plate 34, and main roller 31 and spare roller 32 are installed in the middle of ear plate 47. Hollow shaft 33 passes through ear plate 47, and cooling hose 48 is connected to one end of hollow shaft 33. 32 internal structures are drilled with ventilation holes 52 on the roller spokes, a high temperature resistant bearing 49 is installed at the center of the rollers, two dust covers 50 are fixedly installed on both sides of the spokes and on the radial plane of the rollers, and there are outlet holes drilled on the dust covers 50. The air holes 51 are drilled in the hollow shaft 33, and the air holes 53 are located between the spokes and the dust cover. The diameter of the main roller 31 is 0.1-8 mm larger than that of the spare roller 32, and the main roller 31 is on the axial circular track 8. The spring 36 is installed between the arc plate 34 and the seat frame 37 .

The circumferential flexible follow-up sealing device includes an upper seal and a lower seal, please refer to Fig. 7, Fig. 8, and Fig. 9. The counterweight support rod 21 and the corner sealing plate 22 are welded on the inner side of the upper part of the rotor housing 3, and the counterweight support rod 21 is connected with the accompanying The moving hollow shaft 23 is connected by a hinge, the main roller 19 and the spare roller 20 are installed at the lower end of the follower hollow shaft 23, and the cooling hose 58 is connected to one end of the follower hollow shaft 23, and the internal structure of the main roller 19 and the spare roller 20 is on the spokes of the rollers Ventilation hole 56 is drilled, high temperature resistant bearing 54 is installed in the center of the roller, two dustproof covers 55 are fixedly installed on both sides of the spoke and on the radial plane of the roller, and air outlet 59 is drilled on the dustproof cover 55. 23 is drilled with a vent hole 57, the vent hole 57 is located between the spoke and the dust cover, the diameter of the main roller 19 is 0.1-8mm larger than that of the backup roller 20, and the annular pressure plate 26 is welded on the inner side of the follower hollow shaft 23, and the annular flexible bypass is sealed The sheet 25 is fixed between each annular pressure plate 26 by bolts, one end of the flexible connecting piece 24 is connected with the angle-shaped sealing plate 22, and the other end is connected with the annular pressure plate 26, and the counterweight 27 is welded on the outside of the follower hollow shaft 23; the rotor The inner side of the lower part of the shell 3 is welded with a counterweight support rod 28 and an angle-shaped sealing plate 22. The counterweight support rod 28 is connected to the follower hollow shaft 29 through a hinge, and the upper end of the follower hollow shaft 29 is installed with a main roller 19, a spare roller 20, and a cooling hose 58 is connected to one end of the follow-up hollow shaft 29, the internal structure of the main roller 19 and the spare roller 20 is to drill a ventilation hole 56 on the roller spokes, install a high temperature resistant bearing 54 at the center of the rollers, and fix them on both sides of the spokes and on the radial plane of the rollers Two dust-proof covers 55 are installed, and air outlet 59 is drilled on the dust-proof cover 55, and air-vent 57 is drilled on follow-up hollow shaft 29, and air-vent 57 is positioned between wheel spoke and dust-proof cover, and main roller 19 diameters are larger than spare roller 20 with a diameter of 0.1-8 mm, welded with an annular pressure plate 26 on the inner side of the hollow shaft 29, the annular flexible bypass seal 25 is fixed between each annular pressure plate 26 by bolts, and one end of the flexible connecting piece 24 is connected to the corner seal plate 22 , the other end is connected with the annular pressure plate 26, and the counterweight 30 is welded on the inner side of the follower hollow shaft 29.

Claims (1)

1. A follow-up flexible sealing device for a rotary air preheater, including a radial follow-up flexible seal, an axial follow-up flexible seal, and a circumferential follow-up flexible seal, characterized in that: The follow-up flexible sealing device includes an upper seal and a lower seal, a flexible radial seal (6) and a radial ring track (5) are installed above the rotor (2) rotating around the central axis (1), and the flexible radial seal The upper end of the sheet (6) and the upper end of the radial annular track (5) are on a horizontal plane, the flexible radial sealing sheet (6) is fixedly connected with the rotor (2), and several fan-shaped plates (9) are connected by a flexible plate (13) to form a A whole follow-up fan-shaped plate (4), each fan-shaped plate (9) upper end lug plate (38) is installed, main roller (10), backup roller (11) are installed in the middle of lug plate (38), hollow shaft ( 12) Wear it in the ear plate (38), the cooling hose (39) is connected to one end of the hollow shaft (12), and the internal structure of the main roller (10) and the spare roller (11) is that there are ventilation holes (44) drilled on the roller spokes. ), a high temperature resistant bearing (40) is installed at the center of the roller, and two dust covers (41) are fixedly installed on both sides of the spoke and on the radial plane of the roller, and an air outlet (42) is drilled on the dust cover (41). Hollow shaft (12) is drilled with vent hole (43), and vent hole (43) is positioned between wheel spoke and dust cover, and main roller (10) diameter is greater than spare roller (11) diameter 0.1-8 millimeter, and main roller (10) On the radial circular track (5), the connecting plate (45) is installed on the fan-shaped plate (9), and the connecting plate (46) is welded at the lower end of the upper central truss (15), between the two connecting plates (45, 46) The flexible connecting plate (14) is connected by bolts; the flexible radial sealing sheet (6) is installed under the rotor (2) rotating around the central axis (1), the radial annular track (5) is installed, and the flexible radial sealing sheet ( 6) The lower end and the lower end of the radial circular track (5) are on a horizontal plane, the flexible radial sealing sheet (6) is fixedly connected with the rotor (2), and several fan-shaped plates (9) are connected into a whole by the flexible plate (13) The follow-up fan-shaped plate (4), the upper end of each fan-shaped plate (9) is equipped with an ear plate (38), and the main roller (10), the spare roller (11), and the hollow shaft (12) are installed in the middle of the ear plate (38). Wear in the ear plate (38), the cooling hose (39) is connected to one end of the hollow shaft (12), and the internal structure of the main roller (10) and the spare roller (11) is to drill holes (44) on the roller spokes, Install high-temperature-resistant bearing (40) at the roller center, fixedly install two dustproof covers (41) on the spoke both sides, roller radial plane, on the dustproof cover (41), be drilled with air outlet (42), on the hollow shaft (12) have air vent (43), and air vent (43) is positioned between wheel spoke and dust cover, and main roller (10) diameter is greater than spare roller (11) diameter 0.1-8 millimeter, and main roller (10) is in diameter On the ring track (5), the connecting plate (45) is installed on the fan-shaped plate (9), and the connecting plate (46) is welded at the upper end of the lower central truss (15), between the two connecting plates (45) (46) The flexible connecting plate (14) is connected by bolts, the counterweight support rod (17) is welded on the upper end of the lower center truss (15), the support rod (16) is welded on the lower end of the fan-shaped plate (9), and the counterweight (18) is installed through a hinge On the counterweight support bar (17), the other end of the counterweight (18) is connected with the bottom end of the support bar (16) by a hinge; The axial follow-up flexible sealing device installs a flexible axial sealing sheet (7), an axial ring track (8) and a flexible radial sealing sheet (7) on the outer side of the rotor (2) rotating around the central axis (1). ) outer end and the outer end of the axial circular track (8) are on the same vertical arc surface, and several arc-shaped plates (34) are connected by arc-shaped flexible plates (35) to form an integral arc-shaped follower plate, each Ear plates (47) are installed at the outer ends of two curved plates (34), main rollers (31) and spare rollers (32) are installed in the middle of the ear plates (47), and the hollow shaft (33) is worn in the ear plates (47), The cooling hose (48) is connected to one end of the hollow shaft (33), and the internal structure of the main roller (31) and the spare roller (32) is drilled with ventilation holes (52) on the roller spokes, and a high temperature resistant bearing (49) is installed in the center of the roller. ), two dust covers (50) are fixedly installed on both sides of the spoke and on the radial plane of the roller, the air outlet (51) is drilled on the dust cover (50), and the air vent (53) is drilled on the hollow shaft (33) ), the air vent (53) is located between the spoke and the dust cover, the diameter of the main roller (31) is 0.1-8 mm greater than the diameter of the spare roller (32), the main roller (31) is on the axial annular track (8), and the spring (36) is installed between the curved plate (34) and the seat frame (37); The circumferential flexible follow-up sealing device includes an upper seal and a lower seal, and the inner side of the upper part of the rotor housing (3) is welded with a counterweight support rod (21), an angular sealing plate (22), a counterweight support rod (21) and a follower hollow shaft (23) are connected by a hinge, the main roller (19) and the spare roller (20) are installed at the lower end of the follow-up hollow shaft (23), the cooling hose (58) is connected to one end of the follow-up hollow shaft (23), and the main roller (19) , spare roller (20) internal structure is to drill ventilating hole (56) on roller spoke, install high temperature resistant bearing (54) at roller center, fixedly install two dustproof covers (54) on wheel spoke both sides, roller radial plane ( 55), the dust cover (55) is drilled with an air outlet (59), and the follower hollow shaft (23) is drilled with an air hole (57), and the air hole (57) is located between the spoke and the dust cover, and the main roller (19) The diameter is 0.1-8 mm larger than the diameter of the spare roller (20), and the annular pressure plate (26) is welded on the inner side of the hollow shaft (23), and the annular flexible bypass sealing sheet (25) is fixed on each annular pressure plate ( 26), one end of the flexible connecting piece (24) is connected with the angle-shaped sealing plate (22), the other end is connected with the annular pressure plate (26), and the counterweight (27) is welded on the outside of the follower hollow shaft (23); The counterweight support rod (28) and the corner sealing plate (22) are welded on the inner side of the lower part of the rotor housing (3). The main roller (19) and spare roller (20) are installed on the upper end, and the cooling hose (58) is connected to one end of the follow-up hollow shaft (29). Ventilation hole (56) is arranged, and high-temperature-resistant bearing (54) is installed in the center of roller, and two dustproof covers (55) are fixedly installed on both sides of wheel spoke, on the radial plane of roller, and air outlet is drilled on the dustproof cover (55) (59), drilled with vent hole (57) at follow-up hollow shaft (29), vent hole (57) is positioned between wheel spoke and dustproof cover, and main roller (19) diameter is greater than spare roller (20) diameter 0.1-8 mm, weld the annular pressure plate (26) on the inner side of the hollow shaft (29), the annular flexible bypass seal (25) is fixed between each annular pressure plate (26) by bolts, one end of the flexible connecting piece (24) and the corner Type sealing plate (22) is connected, and the other end is connected with annular pressure plate (26), and counterweight (30) is welded on the inboard of follow-up hollow shaft (29).

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