JP2010284629A - Vertical roller mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical roller mill having the effect that a speed reducer for a rotary table can be carried away from the mill even if a base for supporting an arm is made of concrete and the speed reducer is large and that anchor bolts for supporting the arm can be suitably arranged. <P>SOLUTION: The vertical roller mill 1 is configured to press a roller 10 onto the rotary table 2 with arms 11 which are held respectively on a plurality of bases made of concrete. Two adjacent bases 31 of the plurality of bases 31 have a space of a dimension Y in-between through which the speed reducer 4 for the rotary table 2 can be carried away from the mill and are combined on top with a beam 33 made of concrete. Also, the two bases 31 are structured in such a manner that anchor bolts 32B, 34 for supporting each arm 11 are installed on each base 31 and on the concrete beam 33 between the bases 31. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The claimed invention relates to a vertical roller mill which is a facility for pulverizing coal or cement raw materials (hereinafter referred to as “raw materials”) using a rotary table and a roller.

  The structure of a conventional vertical roller mill is shown in FIGS. A turntable 2 is installed so as to be able to rotate around a vertical axis, and a motor 3 and a speed reducer 4 which are driving sources thereof are provided in the lower part. A plurality (generally 2 to 4) of rollers 10 are arranged around the rotary table 2, and each roller 10 is configured to be pressed against the upper surface of the table 2. The rotary table 2 and the roller 10 are covered with a cylindrical mill casing 5, and the casing 5 is provided with a raw material inlet 6, a hot-air introduction duct 7, and a pulverized fine powder outlet 8. It has been.

  The raw material supplied from the inlet 6 is placed on the turntable 2, moved to the vicinity of the outer periphery by the action of centrifugal force accompanying the rotation, and is crushed by being reduced by the roller 10. The pulverized raw material is blown up to the upper part of the casing 5 while being dried by hot air sent from the introduction port 7. The fine powder pulverized to a sufficiently fine level is sent out from the take-out port 8 near the upper end, and the other fine powder is supplied again to the rotary table 2 through the separator 9 in the casing 5 and pulverized again. Thus, the fine powder pulverized to a substantially constant particle size is recovered.

  The roller 10 that is pressed onto the rotary table 2 is attached to the upper end of an arm 11 that swings about a shaft (swing shaft) 12 on a gantry 31, and the lower portion of the arm 11 is connected to the hydraulic cylinder 15. Connected to the tip. When the hydraulic cylinder 15 whose base end portion is connected to the foundation concrete 30 is contracted, the arm 11 swings, and the roller 10 is pressed onto the rotary table 2.

  The above-described gantry 31 that supports the roller 10 and the arm 11 is generally formed of a steel material. However, in the following Patent Document 1, the inventors installed the gantry 31 on the rotary table 2. It was proposed to be formed from concrete that is integrated with the basic concrete 30 made. When the gantry 31 is made of concrete, the cost can be greatly reduced as compared with the case where the gantry 31 is made of steel, and high rigidity can be imparted, so that vibration caused by pulverization can be effectively damped. In the vertical roller mill 1 of FIGS. 4 and 5, the gantry 31 is formed of concrete that is integral with the foundation concrete 30. As shown in FIGS. 5B and 5C, the arm 11 has a bearing (bearing case) 13 on a metal base plate 20 supported by anchor bolts 32 and embedded hardware 32a provided on the base 31. Is supported through.

JP 2008-136972 A

  In the vertical roller mill, if the gantry for supporting the arm is formed of concrete, it is necessary to provide a considerable volume by arranging a reinforcing bar inside, and it is difficult to form the gantry compactly. Thus, when the volume of the gantry increases, it becomes impossible to take a wide space between the adjacent gantry, and the maintenance of the equipment in the mill may not be easily performed. In other words, the speed reducer under the table, which is a drive means for the rotary table, may be inspected / maintained after being transported outside through the gantry, but it is adjacent when the speed reducer is large. In the case where the dimension of the gap between the mounts (dimension X in FIG. 5) cannot be made larger than the size of the reduction gear, this is impossible.

  On the other hand, if the clearance is increased and the width of the gantry is reduced in consideration of carry-out of the reducer, the gantry may have insufficient rigidity, and the arm may be sufficiently disposed in an appropriate area. It becomes impossible to support with several anchor bolts.

  The invention according to the claims solves these problems. Even when the arm support base is made of concrete and the speed reducer for the rotary table is large, the speed reducer for the rotary table is removed from the mill. It is possible to provide a saddle type roller mill which can be carried out and can be appropriately arranged with an anchor bolt for supporting an arm.

The vertical roller mill according to the present invention is a vertical roller mill having a structure in which a roller is pressed onto a rotary table by an arm supported on each of a plurality of concrete bases, and two adjacent ones of the plurality of bases. Two stands sandwich the space (the space of dimension Y in the example of FIG. 1) in which the speed reducer for the rotary table can be carried out of the mill (and returned to the original position) and the upper part with a concrete beam For the two mounts, anchor bolts for supporting each arm (specifically, bolts for fixing the bearing case that supports the swing shaft of the arms) It is provided in the above concrete beam.
In this vertical roller mill, the two above-mentioned adjacent frames are formed with a sufficiently large space between them, and the reduction gear for the rotary table is carried out of the mill via the space. can do. Therefore, the maintenance of the speed reducer and the like can be performed smoothly.
If a large space is provided between adjacent mounts, the width of the mount itself may be reduced. However, in this vertical roller mill, the two mounts are connected to each other by concrete beams. Is easily solved. That is, if necessary, the rigidity of the gantry can be appropriately supplemented by the beams. Also, by providing anchor bolts for supporting the arms on each gantry on each gantry and the concrete beam between them, the arm 11 is supported by a sufficient number of anchor bolts arranged in an appropriate region. It becomes possible to do.

The anchor bolt provided on the beam is particularly preferably a through bolt passed through a hole penetrating the beam up and down.
The anchor bolts provided on the beam may be embedded in the concrete in the same manner as those provided on the gantry. However, if it is made to pass through said beam as a through bolt as mentioned above, the operation | work which arranges it will become easy. This is because the procedure of determining the position of the anchor bolt, the height of protrusion to the upper surface, and the like when placing concrete is unnecessary.

In the vertical roller mill having the above-described configuration, each of the arms is supported on a metal base plate fixed by the anchor bolt on the frame and the beam, and is adjacent to all the metal base plates. More preferably, the objects are connected by a metal connecting material, and a mill casing is attached to the upper surface of the metal connecting material with a low friction member interposed therebetween.
In that case, a metal base plate is fixed on the concrete base and the beam, and each arm (specifically, each arm via the bearing case and the swing shaft) is supported on the base plate. The arm can be supported or attached smoothly. Compared to the case where the arm is directly attached to the concrete base or beam, if the arm is supported after fixing the metal base plate, it is easy to ensure the position accuracy of the arm, and the concrete shrinks over time. This is because even when the height of the gantry or the beam is changed, it is possible to cope by using a liner for the metal base plate.
Further, since the metal base plate is connected with the metal connecting material as described above, in the above case, the rigidity of the concrete base can be further increased by suppressing the displacement between the metal base plates. it can. Thereby, even when the space provided between the two mounts described above is considerably large, a mill having the necessary strength and rigidity can be configured.
In the above case, since the mill casing is mounted on the metal connecting material with the low friction member interposed therebetween, the metal connecting material is also connected to the mill casing even though the mill casing expands and contracts when hot air is blown in. Do not generate too much stress. This is because, by the action of the low friction member, an appropriate relative displacement is allowed between the mill casing and the metal connecting member, and the stress of both is smoothly eliminated / reduced.

Among the multiple mounts, the two mounts that are located between the hot air ducts that introduce hot air into the mill are not connected by the concrete beams, and the upper part between the two mounts is almost horizontal. Preferably, the hot air duct is connected to the mill.
Since there is no need to carry out the speed reducer between the two stands sandwiching the hot air duct, it is not necessary to provide a space for carrying out the speed reducer between the stands. There is no need to connect them with concrete beams. Rather, it is preferable not to provide the concrete beam between the mounts as described above, and to provide the hot air duct in the upper part between the mounts as described above. When the hot air duct is connected to the mill through the upper part between the two frames almost horizontally, the raw material in the mill does not fall or accumulate in the hot air duct. If the raw material does not accumulate in the hot air duct, the vertical roller mill can be operated continuously for a long period of time without taking the trouble of discharging it.

Among the plurality of mounts, the upper part is also connected by the concrete beam between the two mounts sandwiching the hot air duct for introducing hot air into the mill, and the hot air duct is connected between the two mounts. It is also preferable to adopt a mode in which the raw material discharge port is provided at the lower portion of the hot air duct while being connected to the mill upwardly through the concrete beam.
It is not necessary to connect the two frames that sandwich the hot air duct with a concrete beam as described above. By doing so, it is possible to unify the configuration. However, when the upper part between the gantry is connected with the concrete beam, the hot air duct cannot be passed through the upper part between the gantry, so it has to be connected to the mill upward through the concrete beam. If this is done, there is a possibility that the raw material in the mill casing will fall and accumulate in the duct. Is possible.

  According to the vertical roller mill of the claimed invention, the reduction gear for the rotary table can be carried out of the mill from between the two adjacent frames, and the maintenance of the reduction gear etc. can be carried out smoothly. it can. On the other hand, in order to connect these two mounts with concrete beams and to provide anchor bolts on the beams, the rigidity of the mounts can be appropriately compensated, and the arm 11 for pressing the roller on the rotary table, It can be supported by a sufficient number of anchor bolts arranged in appropriate areas.

  In addition, according to the invention, it is possible to easily install the anchor bolts provided on the beam, and the mounting of the arm can be made smooth and highly accurate using a metal base plate or the like. It is also possible to attach the mill casing appropriately. Furthermore, it is possible to appropriately connect hot air ducts that reach the inside of the mill casing so that a large amount of raw material does not accumulate therein.

It is a top view which shows the vertical roller mill by invention, Comprising: A part is shown by the cross section. Fig.2 (a) is the II-II arrow directional view which shows the mount 31 made of concrete, the beam 33, etc. in FIG. Further, (b) is a detailed view of a part b in (a), and (c) is a cross-sectional view taken along the line cc in (a). FIG. 2 is a plan view showing a concrete pedestal 31 and a beam 33 in FIG. 1. It is a whole side view which shows the conventional vertical roller mill 1, The one part is shown with the cross section. Fig.5 (a) is a top view which shows the conventional vertical roller mill, Comprising: One part was shown with the cross section. Further, (b) is a cross-sectional view taken along line bb in (a), and (c) is a rear view of (b).

  A vertical roller mill 1 as an embodiment of the invention is shown in FIGS. This vertical roller mill 1 also has the same overall configuration as that shown in FIG. 4 when viewed from the perspective, and can press unground materials such as coal, cement material and blast furnace slag against the rotary table 2. Crushing is performed by four rollers 10. For example, the total height of the equipment is about 20 meters, and the maximum pressing force of one roller 10 against the rotary table 2 is about 270 tons.

  The schematic structure and function of the vertical roller mill 1 will be described below with reference to FIG. That is, first, the rotary table 2 is installed so as to be able to rotate around the vertical axis, and the motor 3 and the speed reducer 4 which are driving means thereof are provided on the foundation concrete 30 and below the rotary table 2. . As the roller 10, a roller body rotatable around a shaft 10 a is attached to an upper portion of a swingable arm 11, and the arm 11 is supported on a swinging shaft 12 so as to be swingable and displaceable. The lower part is connected to the tip of the hydraulic cylinder 15. Since the hydraulic cylinder 15 has a base end connected to the fixing member 16 on the foundation concrete 30, when the force is generated in the contracting direction, the arm 11 is swung to press the roller 10 onto the rotary table 2. (In other words, the raw material can be sandwiched between the roller 10 and the table 2). In the vicinity of the outer periphery of the table 2, a concave surface portion 2 a that easily holds the raw material is formed in a groove shape, and the peripheral surface of the main body of the roller 10 is pressed against the concave surface portion 2 a. However, the concave surface portion 2a of the table 2 and the main body of the roller 10 are formed of a hard material having high wear resistance, so that they are not in direct contact with each other to prevent cracking. . The planar positional relationship between the rotary table 2 and the roller 10 or the like pressed against the concave surface portion 2a is as shown in FIG.

  The rotary table 2 and each roller 10 are covered with a cylindrical mill casing 5 as shown in FIG. 4, and the casing 5 has a raw material inlet 6 and a duct for introducing hot air (hot air duct). 7. An outlet 8 for pulverized fine powder is provided. The raw material supplied from the inlet 6 is placed on the turntable 2, moved to the concave portion 2 a near the outer periphery by the action of centrifugal force accompanying the rotation, and is crushed by being pressed down by the roller 10. As described above, the pulverized raw material is blown up to the upper part while being dried by the hot air sent from the duct 7, and the fine powder pulverized to a sufficiently fine level is recovered from the upper outlet 8. The non-fine one is again supplied onto the rotary table 2 through the separator 9 in the casing 5 and pulverized again. By repeating these steps, the fine powder pulverized to a substantially constant particle size is recovered from the outlet 8.

  In this vertical roller mill 1, the gantry 31 that supports the arm 11 to which the roller 10 is attached is supported by the rocking shaft 12, and is formed of concrete that is integral with the foundation concrete 30. In addition to the reinforcing bars that continue from the inside of the foundation concrete 30, the concrete is placed on the gantry 31 simultaneously with the foundation concrete 30 placement.

If the pedestal 31 is made of concrete, the equipment cost can be reduced compared to the case where the pedestal is made of a steel plate stand, and the pedestal 31 has sufficient rigidity and strength to effectively vibrate during raw material crushing. Can be suppressed. However, on the other hand, the following new technical problems arise. That is, a) Since the base 31 tends to have a large volume, it is difficult to take a wide space between the adjacent bases 31, and when the reduction gear 4 is large, for maintenance and the like B) When the width of the gantry 31 is reduced so that the reduction gear 4 can be pulled out, the anchor 31 is appropriately anchored near the load center point of the arm 11 in the gantry 31. The problem is that it becomes impossible to dispose the bolt (the bolt for fixing the bearing case 13).
In consideration of such technical problems, the vertical roller mill 1 employs the following configuration in relation to the gantry 31.

  First, out of the four sets of mounts 31 that respectively support the four arms 11 for the four rollers 10, two sets of mounts 31 sandwiching the space where the motor 3 for the rotary table 2 is installed as shown in FIG. Is formed so as to have a gap Y between which the speed reducer 4 can be carried out of the mill. Since it is not necessary to ensure the dimension Y between the two sets of mounts 31 and the other mounts 31, each of the two sets of mounts 31 is formed to be asymmetrical as shown in FIG. .

  The two sets of mounts 31 are connected by integrating a concrete beam 33 at the top as shown in FIG. In addition, an anchor bolt for supporting the arm 11 is provided not only in the gantry 31 but also in the beam 33. This is because it is difficult to place a sufficient number of anchor bolts on the side of the gantry 31 that secures the gap dimension Y because the gantry 31 is asymmetric as described above. As shown in FIG. 3, on the side of securing the gap dimension Y, two anchor bolts 32 </ b> B are provided in the gantry 31, and two anchor bolts 34 are disposed on the beam 33. The arm 11 can be supported in the same manner as the three anchor bolts 32A provided on the opposite side. Note that any anchor bolts 32A, 32B, and 34 are attached with embedded hardware as necessary.

  With the configuration as described above, a clearance Y is secured between the two bases 31 sandwiching the motor 3 shown in FIG. 1 so that the speed reducer 4 can be pulled out as shown in FIG. The anchor bolts 32A, 32B, and 34 could be arranged so as to be suitable for supporting the bolts.

  The anchor bolts 34 provided on the concrete beam 33 described above are not embedded in the concrete, but are through bolts that penetrate the beam 33 vertically as shown in FIGS. 2 (a) and 2 (b). That is, when the beam 33 is formed, a steel pipe 33p having a length equal to the thickness of the beam 33, in which a metal member 33q is welded to the outside, is embedded in the concrete. After the beam 33 is completed, the anchor bolt 34 is inserted into the steel pipe 33p. Through. By attaching nuts 34 a to the upper and lower ends of the anchor bolt 34, the same function and strength as when the bolt is embedded in the beam 33 are exhibited.

A metal base plate 20 is fixed to the top surfaces of the concrete base 31 and the beam 33 to support the arm 11 for each roller 10 shown in FIG. The metal base plate 20 has a size that partially extends from the upper surface of the set of bases 31 to the beam 33, and anchor bolts 32A, 32B, and 34 are used to mount the installation liner 21 as shown in FIG. It fixes to the upper surface of the beam 33 with the sandwich.
The bearing case 13 for supporting the arm 11 shown in FIG. 1 by its swing shaft 12 is a bolt (same as above) with a height adjusting liner (not shown) sandwiched between the metal base plates 20 thus fixed. Install by. When the height of the gantry 31 or the like changes due to concrete shrinkage or the like, the height of the arm 11 or the like can be readjusted by the liner.

  As for the metal base plates 20 having the same number as the rollers 10, the adjacent ones are connected by a metal connecting member 35 as shown in FIG. In addition, the mill casing 5 is placed on the upper surface of the metallic connecting member 35 with the low friction member 36 interposed therebetween as shown in FIG. As the low friction member 36, for example, a liner made of Teflon (registered trademark) is sandwiched, and a bolt (not shown) is provided between the connecting member 35 and the mill casing 5 so as to be relatively slidable inward and outward of the casing 5. ) Etc. By doing so, even if the mill casing 5 undergoes thermal expansion (and contraction), generation of inappropriate stress or the like can be avoided.

  In the example shown in FIG. 1 and the like, among the four sets of mounts 31, only two sets 31 of the mounts 31 that sandwich the motor 3 are connected by the concrete beam 33, and the duct 7 for introducing hot air is sandwiched. The two sets of mounts 31 are not provided with such beams. The reason is that since the speed reducer 4 is not pulled out from the place where the duct 7 is present, the frame 31 on both sides thereof can have a sufficient width and does not need to be connected by a beam. In addition, as in the case of FIG. 4, it is possible to prevent the material 7 from falling or accumulating in the duct 7 by connecting the duct 7 to the mill casing 5 almost horizontally from the upper part between the mounts 31 as in FIG. It is also because it has the advantage of being easily done.

1 Vertical roller mill 2 Rotary table 5 Mill casing 7 Duct (hot air duct)
DESCRIPTION OF SYMBOLS 10 Roller 11 Arm 12 Oscillating shaft 13 Bearing case 20 Metal base plate 31 Concrete mount 33 Concrete beam 32A / 32B / 34 Anchor bolt 35 Metal coupling material 36 Low friction member

Claims (5)

A vertical roller mill having a structure in which a roller is pressed onto a rotary table by an arm supported on each of a plurality of concrete mounts,
Two adjacent stands among the plurality of stands sandwich the space where the reduction gear for the rotary table can be carried out of the mill and are connected to each other by a concrete beam. The anchor roller bolt for supporting each arm is provided on each gantry and the concrete beam between them.   The vertical roller mill according to claim 1, wherein the anchor bolt provided on the beam is a through bolt passed through a hole penetrating the beam up and down. Each of the arms is supported on a metal base plate fixed with the anchor bolt on the frame and the beam;
Further, adjacent metal base plates are connected to each other with a metal connecting material, and a mill casing is attached to the upper surface of the metal connecting material with a low friction member interposed therebetween. A vertical roller mill according to claim 1 or 2.   Among the multiple mounts, the two mounts that are located between the hot air ducts that introduce hot air into the mill are not connected by the concrete beams, and the upper part between the two mounts is almost horizontal. The vertical roller mill according to claim 1, wherein the hot air duct is connected to the inside of the mill.   Among the plurality of mounts, the upper part is also connected by the concrete beam between the two mounts sandwiching the hot air duct for introducing hot air into the mill, and the hot air duct is connected between the two mounts. The raw material discharge port is provided in the lower part of the hot air duct, and is connected to the inside of the mill upwardly under the concrete beam. Vertical roller mill.

Images