JP2019042702A - Vertical crusher - Google Patents

Abstract

To provide a vertical crusher which reduces, in particular, upward vibration of vertical vibration acting on crushing rollers during crushing.SOLUTION: A vertical crusher 10 of the invention rolls crushing rollers 16, which contact with a rotary table 14 through a crushed material, to crush the crushed material. The crushing roller 16 is characterized in that a bearing case supporting a swing shaft is fixed onto a metallic frame 50 and a weight 60 is provided in an internal space of the frame 50.SELECTED DRAWING: Figure 1

Description

  The present invention mainly pulverizes coal, oil coke, limestone, slag, clinker, cement raw material, other inorganic raw materials, or organic raw materials such as chemicals or biomass into powder with a grinding roller driven on a rotating table. It relates to a vertical crusher.

  A vertical crusher is widely used as a crusher for crushing raw materials such as coal and biomass. The conventional vertical crusher includes a rotary table and a plurality of grinding rollers disposed at positions equally dividing the upper surface outer peripheral portion of the rotary table in the circumferential direction in a casing forming an outer shell of the crusher. .

  In such a vertical crusher, when the ground material is supplied to the center of the rotary table, the ground material moves to the outer peripheral portion of the rotary table by the rotation of the rotary table. Since the pulverizing roller is in pressure contact with the outer peripheral portion and is rotating, the pulverized raw material enters between the pulverizing roller and the rotating table and is pulverized. Then, the heat and air blown up from the annular passage between the outer peripheral surface of the rotary table and the inner peripheral surface of the casing raises the inside of the casing while drying the powder particles together with the hot air. Particulate matter is distributed by classification means provided in the upper part in the casing, and a product of a predetermined particle size is discharged to the outside. The coarse powder which can not pass through the classification means falls again on the rotating table and is crushed.

In the vertical crusher described above, the layer thickness of the raw material on the rotary table is maintained at a certain value, and the raw material sliding from the center to the outer periphery of the rotary table by centrifugal force is held on the rotary table for a fixed time The grinding action that takes place between the grinding roller and the rotary table takes place. The grinding roller is operated by the hydraulic cylinder connected to the grinding roller and the arm, and the pressing force on the rotary table is exerted. The bearing case for supporting the swing shaft of the grinding roller is fastened by a bolt or the like on a steel stand. The reaction force that the crushing roller presses on the rotary table is transmitted to the foundation via the arm of the crushing roller, the bearing case of the crushing roller, and the steel pedestal. A hydraulic cylinder acting to press the grinding roller against the rotary table has one end of the hydraulic cylinder pinned to the arm of the grinding roller and the other fixed to the base, and the load during grinding acts repeatedly.
As described above, the reaction force generated on the rack at the time of crushing largely fluctuates at the time of operation, and the bearing case supporting the rocking shaft is installed on the steel rack and is used for the reaction and the rack that presses the crushing roller downward. It receives the load of vertical fluctuation at the time of crushing which acts on it. The force pressing the grinding roller onto the rotary table is provided by the hydraulic cylinder. The anti-crushing roller side of the hydraulic cylinder is fixed to the foundation, and at the time of crushing, the hydraulic cylinder applies a fluctuating load above and below the crushing roller.

At the time of crushing, a reaction force and a load repeatedly act on a frame in which a bearing case supporting the swinging shaft is fastened by a bolt.
During the grinding operation of the grinding roller, the load constantly changes, and the direction of the load acts on the rotating table in the vertical direction (vertical direction). With the crushing of the raw material, vibration is generated due to pressure application of the crushing force and load release due to crushing. When the ground material is suddenly broken by the grinding roller, the compression force of the grinding roller is suddenly released, so vertical vibration occurs mainly at the time of crushing, and the vibration is also proportional to the size and hardness of the ground material growing. Therefore, the steel stand supporting the grinding roller bearing case needs to have sufficient strength to bear the load supporting the large grinding load. Thus, the load at the time of grinding always fluctuates, and the vertical vibration is repeated. And at the time of a grinding operation, it appears as vibration of the whole grinder.

Such vibrations generated between the grinding roller and the rotating table cause equipment damage and deterioration of the grinding operation environment. Conventionally, various improvement methods for reducing vibration have been proposed.
The conventional gantry structure increases the rigidity of the steel structure to suppress deformation and cope with load changes. In this case, the weight of the structure increases and the steel structure becomes complicated in order to secure rigidity, which causes an increase in processing cost required for welding and bending.
For this reason, there is a structure disclosed in Patent Document 1 in which the mount is made of concrete and a steel bearing case is installed only on the upper portion of the mount made of concrete. The concrete base secures rigidity by fixing a steel bearing case to an anchor bolt embedded inside the concrete.

Patent No. 4965984

  There is no problem in the case of a concrete stand which always acts only on the reaction force. However, as described above, the load on the grinding roller fluctuates in the vertical direction, and the load is a load accompanied by an impact. As a result of long-term operation, the adhesion between the anchor bolt embedded in the concrete and the concrete may be reduced. As a result, since the restraining force of the bearing case is reduced, if a large load is repeatedly applied over a long period of time, the adhesion between the anchor bolt and the concrete must be reduced, and the anchor bolt must be re-embedded.

  SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a vertical type crusher which reduces particularly upward vibration among vertical vibrations acting on a grinding roller at the time of grinding.

As a first means for solving the above-mentioned problems, the present invention relates to a vertical crusher in which a grinding roller in contact with a grinding material on a rotating table is rolled to crush the grinding material,
In the crush roller, a bearing case for supporting a rocking shaft is fixed on a metal stand, and a weight body is provided in an internal space of the stand. It is in.
With the configuration of the first means, it is possible to cancel and reduce, in particular, the upward vibration among the vertical vibrations generated at the time of crushing. Therefore, the vibration of the whole apparatus resulting from a grinding roller can be reduced.
In addition, it is possible to simplify the overall configuration of the pedestal by reducing the weight of the steel pedestal and reducing the number of steps of welding and bending.

As a second means for solving the above problems, according to the present invention, in the first means, the weight body is variable in weight and removable from the internal space. It is in providing a crusher.
According to the configuration of the second means, it is possible to apply a weight body of an optimal weight considering the load of vertical fluctuation by the grinding roller according to the size of the grinding roller and the generation degree of vibration after the start of operation.

As a third means for solving the above problems, according to the present invention, in the first or second means, the weight body is made of steel or concrete as a material. To provide.
According to the configuration of the third means, it is possible to reduce the material cost required for the entire apparatus by applying an inexpensive material such as scrap steel, casting or concrete as a steel material.

As a fourth means for solving the above-mentioned problems, according to the present invention, in the first to third means, the space between the internal space and the weight body is filled with the flowable material and solidified. The present invention is to provide a vertical mill characterized by
According to the configuration of the fourth means, it is possible to cancel and reduce the echo or amplification of the vibration noise generated at the time of vibration inside the gantry.

According to the present invention as described above, it is possible to cancel and reduce the load of vertical fluctuation caused by the grinding roller at the time of grinding by the weight body provided in the internal space of the steel pedestal. In addition, the weight reduction of the steel stand and the number of manufacturing steps can be reduced to simplify the overall configuration.
Further, the fixation of the steel pedestal and the base can be made flexible so as to be movable by the amount of displacement with respect to the upward force, and the downward force can be transmitted as it is.

It is explanatory drawing of the vertical crusher of this invention. It is explanatory drawing of a mount frame.

  Embodiments of the vertical crusher of the present invention will be described in detail below with reference to the accompanying drawings.

[Vertical crusher 10]
FIG. 1 is an explanatory view of a vertical mill according to the present invention. FIG. 2 is an explanatory view of a gantry. As shown in FIG. 1, the vertical crusher 10 includes a casing 12, a rotary table 14, and a plurality of grinding rollers 16 disposed at positions equally dividing the upper surface outer peripheral portion of the rotary table 14 in the circumferential direction. An annular passage 40 formed along the outer periphery of the table 14 and a classification means 30 provided on the upper portion of the casing 12 are mainly configured.

  The grinding roller 16 is coupled to an arm 20 rotatably supported by penetrating the casing 12 and a piston rod of the hydraulic cylinder 24 via the arm 20. The grinding roller 16 is laterally pressed against the upper surface 14A of the rotary table by the operation of the hydraulic cylinder 24, and is rotated by being driven by the rotary table 14 through the raw material for grinding.

A classification means 30 is provided above the rotary table upper surface 14A of the casing 12.
The classification means 30 includes a rotating shaft 30a, rotating blades 30b, and a fixed blade 30c. The rotating shaft 30a is suspended downward from the upper surface of the casing 12, and is rotatable by an external drive motor (not shown). A plurality of rotary vanes 30b are formed side by side annularly around the rotary shaft 30a at the lower part of the rotary shaft 30a. Furthermore, a plurality of fixed blades 30c are formed side by side on the outer periphery of the rotary blade 30b. The rotary vanes 30b and the fixed vanes 30c are both arranged in the longitudinal direction parallel to the axial center of the rotary shaft 30a, and the hot air rising inside the casing 12 is the clearance of the vanes parallel to the rotary shaft 30a axial center Supplied from In the classification means 30 having such a configuration, the rotary vanes 30b are rotated together with the rotary shaft 30a, and only the fine particles (fines) having passed through the stationary vanes 30c and the rotary vanes 30b are discharged from the upper outlet 44.

  An inner cone 30e and a feed pipe 30f are provided at the lower end portion of the fixed blade 30c. The inner cone 30e is formed in the shape of a funnel whose diameter decreases from the upper side to the lower side, and the feed pipe 30f is formed in a cylindrical shape connected to the lower end of the inner cone 30e and can not pass through the classification means 30 The body is captured and supplied to the upper surface 14A of the rotary table from the lower outlet through the feed pipe 30f.

A raw material feed chute 34 is connected to the inner cone 30e. The raw material is introduced from the raw material inlet 32 into the upper surface 14A of the rotary table via the raw material injection chute 34.
The raw material charged from the raw material charging chute 34 moves to the outer peripheral portion of the rotary table upper surface 14A while drawing a spiral trajectory on the rotary table upper surface 14A, and is bitten between the rotary table upper surface 14A and the grinding roller 16 and crushed. Ru. Then, a part of the pulverized powder particles travels to an annular passage 40 which is a gap between the outer peripheral portion of the upper surface 14 A of the rotary table and the casing 12. Here, below the rotary table 14 of the lower casing 12B, a gas inlet 42 for introducing hot air heated to a predetermined temperature is provided.

During operation of the vertical crusher 10, by introducing the hot air from the gas inlet 42, the hot air flowing from the lower side of the rotary table 14 through the classification means 30 to the upper outlet 44 in the casing 12 Airflow is occurring.
The raw material introduced into the vertical crusher 10 and a part of the powder particles crushed into the rotary table 14 and the crush roller 16 are blown up by the hot air from the annular passage 40 and ascend in the casing 12 for classification. The means 30 are reached.

Here, the powder particles having a large diameter and mass can not pass through the fixed blade 30c and the rotary blade 30b of the classification means 30, fall to the inner cone 30e, are bitten again by the grinding roller 16, and are crushed Ru. On the other hand, the granular material having a small diameter passes between the fixed vanes 30c and the rotary vanes 30b which are lined up with a gap, passes through the classification means 30, and is taken out of the casing 12 from the upper outlet 44.
In addition, the raw material of a part of the maximum particle diameter which has reached the annular passage 40 without being caught in the grinding roller 16 falls from the annular passage 40 to the lower side of the rotary table 14 and is crushed into a bowl shape from the lower outlet 46 Taken out of the machine 10.

[Mount 50]
The gantry 50 is provided outside the casing 12. The gantry 50 fixes, at its upper surface, a bearing case 26 that rotatably supports the swinging shaft 21 of the arm 20 of the grinding roller 16. Further, the gantry 50 is provided with an internal space 52 having an opening at a part of the side surface. The internal space 52 is formed in such a size that a weight body 60 described later can be disposed therein. The mount 50 is made of steel as a material, and the interior space 52 is provided to reduce the weight of the whole mount and reduce the number of steps of welding and bending for simplification.

[Weight body 60]
The weight body 60 is a weight attached to the internal space 52 of the gantry 50. The material of the weight body 60 can be a heavy metal material such as lead, copper, steel or the like, concrete, clay or the like, and the material cost particularly when using an inexpensive material such as scrap steel, cast or concrete Can be reduced.
The weight 60 is detachable from the internal space 52, and its weight is set in consideration of the size of the grinding roller 16 and the load of vertical fluctuation by the grinding roller 16 according to the degree of generation of vibration after the start of operation. Good. Therefore, it is preferable to prepare in advance a plurality of weights having different weights. A bolt hole 54 for attaching a cover (lid) 56 is provided on the side of the gantry 50 provided with the internal space 52, and the cover 56 is fixed to close the internal space 52.

[Flowable material]
When the weight 60 made of steel is installed in the internal space 52 of the rack 50 made of steel, the vibration noise at the time of crushing may be echoed or amplified in the rack 50. In this case, a fluid material such as concrete is filled and solidified in the gap of the internal space 52 in which the weight body 60 is installed, or an elastic body such as polyurethane, polystyrene, polyolefin, polystyrene or the like is used as the raw material. There is. With such a configuration, vibration noise can be canceled and reduced.

[Effect]
The operation of the vertical crusher of the present invention according to the above configuration will be described below.
When the rotary table 14 of the vertical crusher 10 is rotated, the grinding roller 16 that is laterally pressed by the hydraulic cylinder 24 to the upper surface 14A of the rotary table also rotates. Then, when the pulverized raw material is introduced from the raw material inlet 32 to the upper surface 14A of the rotary table, it falls to the upper surface 14A of the rotary table and moves toward the outer peripheral portion of the table while drawing the spiral trajectory. Between the upper surface 14A of the rotary table and the grinding roller 16 and crushed.

  The above-described reaction force and load of vertical fluctuation repeatedly act on the mount 50 by the grinding roller during grinding. In the vertical crusher 10 of the present invention, the weight body 60 is disposed in the internal space 52 of the pedestal 50 to cancel and reduce the upward load, in particular, of the vertical vibration. Therefore, equipment damage can be reduced and long-term operation can be realized.

In addition, it is possible to apply a weight body 60 of an optimal weight considering the load of vertical fluctuation by the grinding roller 16 according to the size of the grinding roller 16 and the generation degree of vibration after the start of operation. The work of replacing the weight body 60 can be easily attached and detached (replaced) after the cover 56 is removed.
Further, when there is a gap between the weight body 60 disposed in the internal space 52 and the internal space 52, the vibration material at the time of crushing is within the gantry 50 by filling the flowable material and solidifying it. Echoes or amplification can be effectively absorbed and prevented.

  According to such a vertical crusher of the present invention, it is possible to cancel and reduce the load of vertical fluctuation caused by the crush roller at the time of crushing by the weight body provided in the internal space of the steel pedestal. In addition, the weight reduction of the steel stand and the number of manufacturing steps can be reduced to simplify the overall configuration.

  The present invention is particularly useful for a vertical crusher in which raw materials such as coal and biomass are crushed by a crush roller driven by the rotation of a rotary table.

DESCRIPTION OF SYMBOLS 10 ............ Vertical crusher, 12 ......... Casing, 12B ......... Lower casing, 14 ......... Rotating table, 14A ......... Rotating table upper surface, 16 ............ Grinding roller, 20 ......... Upper arm , 21 ......... rocking shaft, 22 ... ... lower arm, 24 ... ... hydraulic cylinder, 26 ... ... bearing case, 30 ... classification means, 30a ... ... rotating shaft, 30b ... ... rotating blades , 30c: fixed blade, 30e: inner cone, 30f: feed tube, 32: raw material feeding port, 34: raw material feeding chute, 40: annular passage, 42: gas Introductory port, 44: upper extraction port, 50: frame, 52: internal space, 54: bolt hole, 56: cover, 60: weight body.

Claims (4)

In a vertical crusher, the crusher is crushed by rolling a crush roller in contact with a crusher via a crusher on a rotary table,
In the vertical type crusher according to the present invention, a bearing case for supporting a rocking shaft is fixed on a metal pedestal, and a weight body is provided in an internal space of the pedestal.   The vertical mass mill according to claim 1, wherein the weight body is variable in weight and removable from the internal space.   The vertical mass mill according to claim 1 or 2, wherein the weight body is made of steel or concrete as a material.   4. A vertical pulverizer according to any one of claims 1 to 3, characterized in that a fluid material is filled in the space between the internal space and the weight body and solidified.

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