JP7156936B2 - Support structure for rotating structures - Google Patents

Description

The present disclosure relates to support structures for rotating structures.

Rotary stoker furnaces, rotary kilns, and the like are provided with a cylindrical furnace or kiln as a large rotating structure (Patent Document 1 below). For example, in the case of a rotary stoker furnace used as an incinerator, a cylindrical furnace body, which is a rotating structure, has an outer diameter of 3 meters and a length of 10 meters. These rotating structures are rotatably supported from below with their rotation axes substantially horizontal. Specifically, at least two annular supported members called tires are attached to the outer periphery of a rotating structure (furnace or kiln), and each tire is driven by a pair of freely rotatable driven rollers (turning rollers). supported from below.

That is, the rotating structure is basically only placed on the four driven rollers and held on the driven rollers by its own weight (mass). An annular gear that meshes with the sprocket attached to the output shaft of the motor is also attached to the outer circumference of the rotating structure, and the rotating structure is rotated by the motor. A mechanism such as a thrust roller is also provided for restricting the axial movement of the rotating structure. The thrust roller is a driven roller that is freely rotatable around an axis perpendicular to the axial direction of the rotating structure, and its outer circumference contacts the side surface of the tire. That is, the thrust roller restricts the axial movement of the rotating structure by restricting the axial movement of the tire. Support structures for such large rotating structures are also used for drums of agitators or dryers, etc., and rotating structures are not limited to furnaces or kilns.

JP-A-2005-114213

After the great earthquakes such as the Great Hanshin-Awaji Earthquake and the Great East Japan Earthquake, there has been a strong demand for countermeasures against earthquakes in recent years. Specifically, the support structure of rotating structures is also required to be designed in consideration of larger scale earthquakes. When lateral acceleration due to an earthquake acts on a rotating structure, a force of magnitude represented by the product of the acceleration and the mass of the rotating structure is applied to the rotating structure in the lateral direction. In the conventional support structure described above, the rotating structure is only placed on the four driven rollers, so if the rotating structure gets over the driven rollers (turning rollers), the driven rollers (turning rollers and thrust rollers) will and the drive mechanism (annular gear, sprocket and motor) will be damaged. Considering the mass and size of the rotating structure, if these mechanisms are damaged, it is expected that restoration will be extremely difficult.

An object of the present disclosure is to provide a support structure for a rotating structure that can more stably support the rotating structure.

The support structure for the rotating structure of the present disclosure comprises a horizontally positioned, rotatable hollow or solid cylindrical rotating structure, and at least two spaced apart structures attached to the outer periphery of said rotating structure. It is characterized by comprising an annular tire, a pair of support rollers that support each of the tires from below, and an auxiliary roller that is a driven roller that contacts each of the tires from above.

A biasing device may be further provided for biasing each of the auxiliary rollers toward the tire.

Here, a pair of the auxiliary rollers may be provided for each of the tires, and the auxiliary rollers may be arranged on the opposite side of the support rollers with respect to the rotating shaft of the rotating structure. .

The rotating structure is a furnace body of a rotary stoker furnace, the outer diameters of the at least two tires are equal, and the distance between the pair of support rollers supporting one of the tires from below is such that the other of the tires is supported from below. The other side of the furnace body may be a discharge side of the waste to be incinerated in the furnace body, and the other side of the furnace body may be wider than the space between the pair of supporting rollers.

According to the support structure for a rotating structure of the present disclosure, it is possible to more stably support the rotating structure.

FIG. 1 is a cross-sectional view of a rotary stoker furnace to which a support structure for a rotating structure according to one embodiment is applied. FIG. 2 is a cross-sectional view of the rotating structure (furnace main body). FIG. 3 is an enlarged cross-sectional view of part III in FIG. FIG. 4 is a schematic perspective view of the support structure. FIG. 5 is a front view of the support structure. FIG. 6 is a front view of a modification of the support structure. FIG. 7 is a schematic perspective view of a support structure for a rotating structure according to another embodiment.

Hereinafter, a support structure for a rotating structure according to an embodiment will be described with reference to the drawings. The rotating structure in one embodiment is the furnace body 1 of a rotary stoker furnace used as an incinerator for waste 14, as shown in FIGS. Peripheral parts of the furnace body 1, including a tire 9, which will be described later, are made of metal having heat resistance against the high temperature of the furnace. First, the configuration of the rotary stoker furnace will be described.

The rotary stoker furnace has a furnace body (rotating structure) 1 . The furnace body 1 is also called a grate, and the furnace body 1 in this embodiment is a cylindrical grate. The furnace body 1 is constructed by arranging a large number of water tubes 4 at regular intervals in the circumferential direction between an inlet header tube 2 and an outlet header tube 3 which are formed in an annular shape. Both ends of each water pipe 4 are connected to the inlet header pipe 2 and the outlet header pipe 3, respectively. Adjacent water tubes 4 are connected by fins 7, and each fin 7 has a large number of air holes 6 formed at intervals along its longitudinal direction. The cylindrical shape of the furnace body 1 is formed by alternately connecting the water tubes 4 and the fins 7 .

The furnace main body 1 is housed in a cover casing 8 and placed horizontally with an inclination such that the outlet header pipe 3 is lower than the inlet header pipe 2. - 特許庁In this embodiment, the furnace body 1 is tilted by tilting the installation surface F (see FIG. 4) of the furnace body 1 . In addition, as described above, the furnace main body 1 is placed horizontally. Here, "horizontally placed" means that the rotation axis of the furnace body 1 is substantially horizontal, and includes cases where it is not exactly horizontal. In this embodiment, the rotation axis of the furnace body 1 is tilted at 6 degrees with respect to the horizontal (the installation surface F described above is tilted at 6 degrees with respect to the horizontal). Further, the furnace main body 1 as a large rotating structure of this embodiment has an outer diameter of 3 meters and a length of 10 meters.

Tires 9 are attached concentrically with the furnace main body 1 on the outer periphery near both ends of the furnace main body 1 . The size of the two tires 9 is the same. A mechanism (not shown) for absorbing radial thermal expansion of the furnace body 1 is provided between the furnace body 1 and the tires 9 (see FIG. 5). That is, the tire 9 is attached to the outer circumference of the furnace body 1 via this absorption mechanism. In addition, this structure ensures a distance between the furnace main body 1 and the tires 9, so that the tires 9 are hardly affected by the heat from the furnace main body 1, and the outer diameter of the tires 9 changes due to thermal expansion. is negligible.

The tires 9 have an outer diameter of 5 meters, and the furnace body 1 has a weight of 70 to 80 tons, including accompanying mechanisms such as the tires 9 that rotate together. Each tire 9 is placed on a pair of turning rollers (support rollers) 10 . The turning roller 10 is outside the cover casing 8 , and an opening is formed in the cover casing 8 to allow the turning roller 10 to contact the tire 9 . Each turning roller 10 is a freely rotatable driven roller. A motor 11 is also provided as a drive source for rotating the furnace body 1 (the drive mechanism of the furnace body 1 will be described later in detail).

Boiler water is circulated in each water pipe 4 through a rotary joint 12 connected to the outlet header pipe 3 . The piping between the outlet header pipe 3 and the rotary joint 12 is a double pipe, and supplies boiler water to the water pipe 4 and recovers boiler water from the water pipe 4 at the same time. By circulating the boiler water in the water tube 4, the heat can be recovered and reused. Further, the life of the water pipes 4 can be extended by controlling the temperature of the water pipes 4 within a desired range by circulating the boiler water while burning the waste 14 at a high temperature. The waste 14 in the input hopper 13 is supplied to the interior of the furnace body 1 by a duster 15 .

An air duct 16 is provided below the furnace body 1 . Combustion air 5 is supplied from below into the furnace body 1 through the air holes 6 by the air duct 16 . The air duct 16 has three divided passages 16a in the longitudinal direction of the furnace body 1, and a damper 17 is provided in each divided passage 16a. By controlling the damper 17 , the supply amount of the combustion air 5 is adjusted according to the longitudinal deviation of the waste 14 inside the furnace body 1 . As shown in FIG. 2, each divided flow path 16a is also divided into a plurality of divided portions 16b in the circumferential direction of the furnace body 1. As shown in FIG. A damper 17 is also provided for each divided portion 16b, and the supply amount of the combustion air 5 is adjusted according to the circumferential deviation of the waste 14 in the rotating furnace body 1. FIG.

A seal block 18 is attached to each divided portion 16b in the vicinity of the furnace body 1. As shown in FIG. A seal plate 19 attached to the outside of each water tube 4 comes into contact with the seal block 18 as the furnace body 1 rotates. Therefore, the combustion air 5 supplied from the air duct 16 is supplied into the furnace body 1 through the air holes 6 without blowing upward outside the furnace body 1 . Conversely, the seal block 18 and the seal plate 19 also prevent the high-temperature gas in the cover casing 8 from escaping downward, promoting combustion.

In the rotary stoker furnace configured as described above, the waste 14 supplied to the inside of the furnace body 1 is incinerated by the combustion air 5 supplied from the air duct 16 through the processes of drying, thermal decomposition and combustion. The waste 14 inside the furnace body 1 rotating at a low speed (1 to 2 rph) is gradually transferred downstream by the inclination of the furnace body 1 while being agitated within the furnace body 1 . The incinerated material discharged from the furnace body 1 is completely incinerated by the post-combustion device 20 . Moreover, harmful substances in the exhaust gas generated by combustion in the furnace body 1 and the post-combustion device 20 are decomposed in the secondary combustion chamber 21 .

Next, a support structure for the furnace main body (rotating structure) 1 employed in the rotary stoker furnace described above will be described with reference to FIGS. 4 and 5. FIG. 4 and 5 are schematic diagrams. For example, the structure of the furnace body 1 consisting of water tubes 4 and fins 7 is not shown in FIG. As shown in FIG. 4, the furnace main body (rotating structure) 1 is arranged inside a frame 30 provided on an inclined installation surface F. As shown in FIG. A frame 30 is also inside the cover casing 8 . The frame 30 is composed of four pillars 31 erected at right angles from the installation surface F and four beams 32 connecting the upper ends of the pillars 31 .

As described above, the furnace body 1 is supported from below by four turning rollers 10 via tires 9 . That is, the furnace body 1 is placed on four turning rollers 10 via tires 9 . FIG. 4 also shows the sprocket 11a attached to the output shaft of the motor 11 described above. The sprocket 11a meshes with an annular gear 11b provided adjacent to the tire 9 on the upper side of the inclined furnace body 1. As shown in FIG. The annular gear 11b is also attached to the outer circumference of the furnace body 1 in the same manner as the tire 9. As shown in FIG. A so-called pin gear structure is constructed by the sprocket 11a and the annular gear 11b. The motor 11, sprocket 11a and annular gear 11b constitute a drive mechanism for the furnace body 1, and the furnace body 1 is rotated by this drive mechanism. The four turning rollers 10 of this embodiment are all the same (the outer diameter is the same), and the distance between the pair of turning rollers 10 corresponding to each tire 9 is the same.

Further, a thrust roller (not shown) is provided along with the tire 9 on the upper side of the inclined furnace body 1 to restrain the axial movement of the furnace body 1 . The thrust roller is a driven roller that is freely rotatable around an axis perpendicular to the axial direction of the furnace body 1 , and its outer circumference is in contact with the side surface of the tire 9 . In this embodiment, in consideration of the inclination of the furnace main body 1, a thrust roller is provided on the inclined lower side of the tire 9 in order to restrict the downward movement of the furnace main body 1 along the axial direction. However, a thrust roller may be further provided above the inclination of the tire 9 in order to restrict the upward movement of the furnace body 1 along the axial direction. In this case, the tire 9 is sandwiched between the pair of thrust rollers.

Further, auxiliary rollers 35 are provided to contact each tire 9 from above. The auxiliary roller 35 is a freely rotatable driven roller. In this embodiment, a pair of auxiliary rollers 35 are in contact with each tire 9 . Each auxiliary roller 35 is biased toward the tire 9 and pressed against the outer circumference of the tire 9 . Specifically, two parallel braces 33 are fixed to the upper corners of the frame 30 , and spring hangers (biasing devices) 34 are fixed to these braces 33 . Although it is preferable to fix the spring hanger 34 with two braces 33 because of its high rigidity and strength, the spring hanger 34 may be fixed with one brace 33 if there is no problem in terms of rigidity and strength. An auxiliary roller 35 is rotatably attached to the plunger of the spring hanger 34 . The auxiliary roller 35 is urged toward the tire 9 by the coil spring 36 of the spring hanger 34 and pressed against the outer circumference of the tire 9 .

In addition, in this embodiment, the auxiliary rollers 35 are arranged on opposite sides of the turning rollers with respect to the rotation axis O (see FIG. 5) of the furnace body 1 . Therefore, the force of the coil spring 36 pressing the auxiliary roller 35 against the tire 9 is effectively received by the turning roller 10 . Moreover, since this pressing force acts in the direction passing through the rotation axis O of the furnace main body 1 and the tires 9, the lateral force is not applied to the tires 9 by this pressing force. The rotation axis O of the furnace body 1 (tire 9), the rotation axis P of the turning roller, and the rotation axis of the auxiliary roller 35 are parallel to each other.

In FIG. 4, the turning roller 10 is arranged at the same height as the mounting surface F and is shown schematically. However, actually, as shown in FIG. 5, the turning roller 10 is provided on the installation surface F via the base 10X. Further, as described above, a mechanism (not shown) is provided between the furnace body 1 and the tire 9 shown in FIG. 5 to absorb thermal expansion in the radial direction of the furnace body 1 . The axial thermal expansion of the furnace body 1 is about 2 centimeters for a length of 10 meters. Since the axial position of the tire 9 on the upper side of the inclination is regulated by the thrust roller as described above, the axial thermal expansion of the furnace body 1 is absorbed by the width of the tire 9 and the turning roller 10 on the lower side of the inclination. be. That is, the turning roller 10 has a width that allows for thermal expansion of the furnace body 1 in the axial direction.

In this embodiment, as described above, the auxiliary roller 35 is in contact with the tire 9 from above. That is, the furnace body 1 placed on the turning rollers 10 is supported from below by the turning rollers 10 and held by the auxiliary rollers 35 from above. Therefore, even if a lateral force due to an earthquake acts on the furnace body 1 placed on the turning rollers 10 , the lifting of the furnace body 1 from the turning rollers 10 is prevented by the auxiliary rollers 35 . As a result, the furnace body 1 can effectively resist the lateral force and is supported more stably. Although vertical acceleration may occur due to an earthquake, the furnace body 1 can effectively resist the vertical force caused by the vertical acceleration by means of the auxiliary rollers 35 . Since the furnace body 1 is continuously rotated in one direction, it is very difficult to fasten the furnace body 1 somewhere to prevent it from falling off the turning rollers 10 . By adopting a support structure with a holding mechanism using such auxiliary rollers 35, the furnace body 1 can be reliably supported.

Further, in the present embodiment, the auxiliary roller 35 is biased toward the tire 9 by a spring hanger (biasing device) 34 and pressed against the tire 9 . Therefore, when the furnace body 1 does not fall off the turning roller 10 but vibrates on the turning roller 10 due to an earthquake, the spring hanger 34 can absorb the vibration. In addition, the furnace body 1 rotates on the turning roller 10, but the tire 9 is not a perfect circle. The state may not be stable. However, if the auxiliary roller 35 is biased toward the tire 9 by the spring hanger (biasing device) 34, the contact state between the auxiliary roller 35 and the tire 9 is stabilized. That is, the spring hanger (biasing device) 34 can bring the auxiliary roller 35 into contact with the tire 9 more stably, so that the furnace body 1 can be supported even more stably.

Furthermore, in this embodiment, a pair of auxiliary rollers 35 are provided for each tire 9 , and each auxiliary roller 35 is located on the opposite side of the corresponding turning roller 10 with respect to the rotation axis O of the furnace body 1 . are placed in By arranging the auxiliary roller 35 in this manner, the force of the spring hanger (biasing device) 34 pressing the auxiliary roller 35 against the tire 9 is effectively received by the turning roller 10 . As a result, the tires 9, that is, the furnace body 1 can be supported more stably. Also, the tire 9 is placed on a pair of turning rollers 10 and an auxiliary roller 35 is arranged on the opposite side of the turning rollers 10 . Since the rotation axis O of the tire 9 placed on the pair of turning rollers 10 is aligned with the center of the pair of turning rollers, the turning roller 10 and the auxiliary roller 35 are arranged in the horizontal direction with respect to the vertical plane passing through the rotation axis O. arranged symmetrically. Therefore, the tires 9 (furnace body 1) are rotatably and stably supported from all sides by the turning rollers 10 and the auxiliary rollers 35. As shown in FIG.

Incidentally, in this embodiment, the auxiliary roller 35 is pressed against the outer peripheral surface of the tire 9 . In this way, the effect of holding the furnace main body 1 is high. However, if the auxiliary rollers 35 are attached so as not to be displaced, the tires 9, that is, the furnace body 1 can be prevented from falling off the turning rollers 10. FIG. Therefore, in this case, the auxiliary roller 35 only needs to be in contact with at least the tire 9 and does not necessarily have to be pressed against the outer peripheral surface of the tire 9 .

A modification of the embodiment shown in FIG. 5 is shown in FIG. As shown in FIG. 6 , in this modification, one auxiliary roller 35 is provided for each tire 9 . The auxiliary rollers 35 are attached to the frame 30 using subframes 33 a provided on the beams 32 . Specifically, a spring hanger (biasing device) 34 is fixed to the parallel beam 32 and the lateral member of the subframe 33a. A spring hanger (biasing device) 34 has an auxiliary roller 35 and a coil spring 36 as in the embodiment shown in FIG.

The rotation axis of the auxiliary roller 35 is within a vertical plane including the rotation axis O of the furnace body 1 . Since the tire 9 is placed on the turning roller 10, the turning roller 10 is arranged symmetrically with respect to the vertical plane. That is, the auxiliary roller 35 is biased toward the tire 9 from right above the tire 9 and contacts (presses the tire 9), and the direction of the pressing force acts along the vertical plane. Since the furnace main body 1 is tilted, the tire 9 is also tilted, and "directly above" means perpendicular to the rotation axis O of the tire 9 within the vertical plane and from above. Even in this way, the furnace body 1 can be prevented from falling from the turning roller 10, and the furnace body 1 can be supported more stably.

It is also conceivable to increase the distance between the pair of turning rollers 10 in order to more effectively resist the lateral force. That is, the central angle α of the turning roller 10 shown in FIG. 5 may be increased. For example, the central angle α of 40° can more effectively counter the lateral force than 30°. However, if the spacing between the pair of turning rollers 10 is too wide (if the center angle α is too large), the weight of the furnace main body 1 (and the components including the accompanying rotating tires 9 and the like) will cause the turning rollers to The lateral force component acting on 10 becomes large. In addition, it is necessary to increase the installation area of the rotary stoker furnace.

Next, another embodiment utilizing widening the interval between the pair of turning rollers 10 will be described with reference to FIG. The rotating structure of this embodiment is also the furnace main body 1 of the rotary stoker furnace. Therefore, the same reference numerals are given to the same and equivalent components as in the above-described embodiment shown in FIGS. 1 to 4, and detailed description thereof will be omitted. As mentioned above, the furnace body 1 is slanted so that its discharge side is downward in order to gradually transfer the waste 14 therein. Therefore, in the above embodiment, the installation surface F itself is inclined. In this embodiment, as shown in FIG. 7, the installation surface Fh is a horizontal surface, and the space between the turning rollers 10U and 10D is used to incline the furnace body 1. As shown in FIG. That is, the support structure of the furnace body (rotating structure) 1 is used to tilt the furnace body 1 .

Specifically, the distance d (of the rotation axis P) between the pair of turning rollers 10 on the discharge side of the furnace body 1 in the above-described embodiment shown in FIG. are spread out by a distance D (d<D)) of the axis of rotation Q). That is, the distance D between the pair of turning rollers 10D supporting the tire 9 on the discharge side (one) of the waste 14 from below is the distance d between the pair of turning rollers 10U supporting the tire 9 on the introduction side (the other) from below. is wider than More specifically, the contact position interval between the tire 9 and the turning roller 10D on the discharge side is wider than the contact position interval between the tire 9 and the turning roller 10U on the input side.

By doing so, the furnace main body 1 can be installed at an angle while keeping the installation surface Fh horizontal. As shown in FIG. 7, the rotation axis O of the furnace body 1 is inclined at an inclination angle θ with respect to the horizontal axis H, and the pillars 31 of the frame 30 are inclined at an inclination angle θ with respect to the vertical axis V. . In FIG. 7, which is simply shown, a recess 40 is formed on the installation surface Fh in order to avoid interference between the installation surface Fh and the furnace body 1 . However, as described above, if the turning rollers 10U and 10D are provided on the installation surface Fh via the base 10X (see FIG. 5), there is no need to form such recesses 40 (installation surface Fh and furnace body 1 does not interfere). Also, since the frame 30 is inclined with respect to the installation surface Fh, braces 37 as shown in FIG. 7 may be provided between the installation surface Fh and the pillars.

Further, in this case, since the gap between the pair of turning rollers 10D on the discharge side is large, it is possible to cope with the lateral force more effectively. As described above, in the rotary stoker furnace, the waste 14 inside the furnace body 1 is uneven (see FIGS. 1 and 2). The amount of waste 14 is larger on the inlet side of the furnace body 1 than on the outlet side. In addition, since the waste 14 becomes ash by incineration, the waste 14 at the initial stage of combustion on the input side is often heavier than the waste 14 after combustion on the discharge side. Therefore, when the rotary stoker furnace is operated, the center of gravity of the furnace body 1 on the input side may be lower than the center of gravity on the discharge side with respect to the rotation axis O of the furnace body 1 .

In such a case, considering the lateral force due to the earthquake, it is conceivable that the input side is heavy and the center of gravity is low, while the discharge side is light but has a high center of gravity. Therefore, regarding the furnace body 1, it is difficult to say unconditionally whether the furnace body 1 is more likely to fall on the input side or the discharge side due to the lateral force. However, depending on the operating conditions (because the type and amount of the waste 14 also change), it is conceivable that the furnace body 1 may fall more easily on the discharge side than on the input side. In any case, since the turning rollers 10D are spaced widely on the discharging side, the lateral force can be effectively counteracted, and the furnace main body 1 is more stably supported by the auxiliary rollers 35 on the charging side and the discharging side. can do. Therefore, in this embodiment, the installation surface Fh is made horizontal, and the furnace body 1 can be installed with an inclination, and the furnace body 1 can be supported more stably.

This embodiment can also provide the same effects as the embodiment shown in FIG. 4 and described above. Furthermore, in this embodiment, the space between the turning rollers 10U and 10D is used to incline the furnace body 1, so that the installation surface Fh can be a horizontal surface. Therefore, the building of the rotary stoker furnace can be easily constructed. In addition, when the rotary stoker furnace is assembled in the building, the installation surface Fh can be made horizontal, so that not only the machine tools (forklifts, etc.) but also the worker's scaffolding are stabilized, making the installation work easier.

As described above, the rotation axis O of the furnace body 1 (tire 9), the rotation axis P of the turning roller 10U, the rotation axis Q of the turning roller 10D, and the rotation axis of the auxiliary roller 35 are parallel to each other. However, they are all tilted with respect to the horizontal axis H at a tilt angle θ. Further, the pillars 31 of the frame 30 are also inclined with respect to the vertical axis V at an inclination angle θ. On the other hand, also in the above-described embodiment shown in FIG. It is inclined, and the pillars 31 of the frame 30 are not vertical but inclined. That is, these inclinations are not demerits, and since the installation surface Fh is horizontal in the present embodiment, it is easy to construct a structure to incline them.

Note that the present disclosure is not limited to the above embodiments (including modifications). For example, in the above embodiment, the turning rollers (supporting rollers) 10 are all driven rollers, and a separate drive mechanism is provided. However, the furnace main body 1 may be rotated by directly driving one or more of the turning rollers 10 with the motor 11 .

In the above embodiment, the auxiliary rollers 35 are arranged using the frame 30, but the auxiliary rollers 35 may be arranged using the walls and ceiling (columns and beams of the building) of the building of the rotary stoker furnace. . (In this case, it can be considered that the frame 30 is formed by the structural members of the building.)

In addition, in the above-described embodiment, the frame 30 is formed in a rectangular parallelepiped shape, but a gate-shaped frame may be provided for each tire 9 . Even in this way, the auxiliary roller 35 can be brought into contact with (pressing) the tire 9 . Also, in the embodiment shown in FIGS. 4 and 7, the pillars 31 of the frame 30 are not vertically extended (tilted with respect to the vertical). However, even if the frame 30 is formed by the vertical pillars 31, it suffices if the auxiliary rollers 35 can be pressed against the tires 9 at right angles. For example, the spring hanger 34 may be attached obliquely to the frame 30 having the vertical pillars 31 in accordance with the furnace main body 1 inclined at the inclination angle θ.

Further, in the above embodiment, the rotating structure is the furnace main body 1 of the rotary stoker furnace, but it is not limited to this. The rotating structure may be the cylindrical kiln of a rotary kiln, or the drum of an agitator or dryer. Furthermore, the rotating structure may be not cylindrical (hollow columnar) but solid columnar, or may be a rotating structure having a body of revolution shape such as a truncated cone. Even in a rotating structure having such a shape of a rotating body, the provision of the auxiliary rollers 35 makes it possible to more stably support the rotating structure. In this case, the outer diameters of at least two tires 9 may be the same (the distance from the rotating structure is different) or different (the distance from the rotating structure can be the same).

Further, in the above embodiment, two tires 9 are attached to the furnace main body (rotary structure) 1, but three or more tires 9 may be attached separately from each other. When the rotating structure 1 is long in the axial direction, the rotating structure 1 can be supported more appropriately by supporting it with not only two but also three or more tires 9 . It should be noted that the auxiliary rollers 35 do not necessarily have to be provided for all the tires 9 . It may be provided for at least one tire 9 . For example, for one tire 9, the lateral force is counteracted only by widening the spacing of the turning rollers 10, and for the other tires 9, the spacing of the turning rollers 10 is increased to the spacing of the turning rollers 10 of the one tire 9. Even though it is made narrower than that, an auxiliary roller 35 may be provided to counter the lateral force.

Moreover, in the above embodiment, the spring hanger 34 is used as the biasing device. However, the urging device only needs to urge the auxiliary roller 35 toward the tire 9 and press the auxiliary roller 35 against the tire 9. For example, the urging device urges the auxiliary roller 35 toward the tire 9 using hydraulic pressure. may Alternatively, an elastic member such as rubber may be used instead of the coil spring 36, and the auxiliary roller 35 may be biased toward the tire 9 by the elastic restoring force of the elastic member.

In the above embodiment, the rotating structure is the furnace body 1, so the turning roller 10 and the auxiliary roller 35 are made of metal that can withstand high temperatures. However, if the rotating structure does not become hot, the turning roller 10 and the auxiliary roller 35 may have rubber or the like on their outer circumferences.

1 Furnace body (rotating structure)
9 Tires 10, 10U, 10D Turning rollers (support rollers)
14 waste 34 spring hanger (biasing device)
35 Auxiliary rollers d, D Spacing (of turning rollers) O Rotation axis (of furnace body and tires)

Claims (3)

A support structure for a rotating structure, comprising:
a rotatable hollow cylindrical rotating structure arranged horizontally;
at least two annular tires spaced around the circumference of the rotating structure;
a pair of support rollers supporting each of the tires from below;
and an auxiliary roller that is a driven roller that contacts each of the tires from above ,
The rotating structure is a furnace body of a rotary stoker furnace,
the outer diameters of the at least two tires being equal;
The interval between the pair of support rollers that support one of the tires from below is wider than the interval between the pair of support rollers that support the other of the tires from below,
A support structure for a rotating structure , wherein the one side of the furnace body is a discharge side of wastes incinerated in the furnace body . 2. The support structure for a rotating structure according to claim 1, further comprising a biasing device that biases each of said auxiliary rollers toward said tire. A pair of the auxiliary rollers are provided for each of the tires,
3. The support structure for a rotating structure according to claim 2, wherein the auxiliary roller is arranged on the opposite side of the supporting roller with respect to the rotating shaft of the rotating structure.

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