JPH0838922A - Vertical pulverizer - Google Patents

Abstract

PURPOSE:To provide a vertical pulverizer in which the damage of a reduction gear and a static pressure bearing due to heat effect is prevented and the long life of equipment and the improvement of maintainability are attained. CONSTITUTION:A static pressure bearing 30a for bearing vertical load put on a turntable 3A is arranged at the lower end of the outer periphery of the turntable 3A, and also a reduction gear 2 for driving and rotating the turntable 3A is arranged just below the central part. The turntable 3A is made to be in the form having a flat plate 3X on which a pulverizing roller 4 is mounted, an outer peripheral cylinder part 3Y extending downward to the outer periphery of the flat plate part 3X and borne by the static pressure bearing 30 at the lower end, and an inner peripheral cylinder part 3Z extending downward to the central part of the flat plate part 3X and engaged with an output shaft 2a of the reduction gear 2 at the lower end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical crusher for crushing raw materials such as cement raw materials, slag, clinker, ceramics and chemicals by cooperation of a rotary table and a pulverizing roller, and more particularly to a rotary table. The vertical load applied is not supported by a reduction gear that applies rotational force to the rotary table, but is supported separately by a static pressure bearing installed below the outer circumference of the rotary table. The present invention relates to a vertical crusher that minimizes the adverse effects of heat transfer to a speed reducer.

[0002]

2. Description of the Related Art FIG. 7 is a kind of crusher for pulverizing raw materials such as limestone, slag, and cement raw materials into fine powder.
As shown in (1), a vertical crusher 1 having a rotary table and a crushing roller is widely used. This kind of crusher
At the lower part of the cylindrical casing 15, a disk-shaped rotary table 3A that is driven by the speed reducer 2 by the electric motor 2B and rotates at a low speed, and is driven by being pressed by hydraulic pressure or the like to a portion that equally divides the outer peripheral portion of the upper surface in the circumferential direction. And a plurality of crushing rollers 4.

The crushing roller 4 has an arm 5 and an arm 7A, 7B pivotally supported by a shaft 6 on a casing 15.
It is connected to the piston rod 10 of the hydraulic cylinder 9 via the, and by operating the hydraulic cylinder 9, the crushing roller 4 is pressed onto the rotary table 3A to apply crushing pressure to the raw material. 3S is a dam ring provided on the outer peripheral edge of the rotary table 3A for adjusting the raw material layer thickness, 14 is an annular space passage of the crushed product that overflows the rotary table 3A, 17 is a raw material charging chute, and 18 is dropped into the annular space passage. It is a scraper that scrapes crushed products. The crushed product scraped up by the scraper 18 is discharged to the outside of the machine through a discharge chute (not shown). In addition, 17A is a plurality (4 in this embodiment) connected to the raw material charging chute 17.
The main branch pipe 17B is a weir plate provided on the lower surface inside the branch pipe 17A.

In such a vertical crusher, the raw material feeding chute 17 and the branch pipe 17 are inserted into the central portion of the rotary table.
The raw material supplied in A receives a centrifugal force in the radial direction of the table due to the rotation of the rotary table 3A and slides on the rotary table 3A. Rotating table 3A
Rotate somewhat slower than the number of revolutions of. The above two forces,
That is, the radial and rotational forces are combined, and the raw material moves on the rotary table 3A to the outer peripheral portion of the rotary table 3A in a spiral trajectory. Since the roller is pressed against the outer peripheral portion and is rotating, the raw material in which the spiral is drawn enters between the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten therein. It is crushed and crushed.

On the other hand, the planetary speed reducer 2 arranged immediately below the rotary table 3A bears the entire load transmitted to the rotary table by means of a static pressure bearing arranged around the output shaft projecting at the top and decelerates. Not only is it transmitted to the foundation via the machine casing, but the rotary table is driven to rotate by the central output shaft.

[0006]

As described above, in the conventional vertical crusher 1, the rotary table 3A has the hydrostatic bearing on the speed reducer 2 arranged concentrically immediately below the rotary table 3A. Not only the reduction gear 2 always supports not only the own weight of the rotary table 3A and the crushing roller 4 but also the crushing force urged by the hydraulic cylinder 9, and the high-speed clinker (normal temperature 80 ° C. 150 ° C, maximum 200 ° C, etc.) The rotary table 3A rises in temperature due to the crushing heat applied to the high temperature raw material, and the static pressure bearing in severe operating conditions is further subjected to heat load, resulting in shortened life or damage. There was a problem with.

[0007]

In order to solve the above problems, in the present invention, a plurality of rotatable crushing rollers are provided on the upper surface of the outer peripheral portion of a rotary table, and the rotary table is supplied onto the rotary table. In a vertical crusher that crushes the raw material between the rotary table and the peripheral surface of the crushing roller by applying a predetermined pressure to the crushing roller, the static pressure that bears the vertical load such as the self-weight and the crushing force applied to the rotary table. A bearing is arranged at the lower end of the outer periphery of the rotary table, a speed reducer for rotationally driving the rotary table is arranged below the center of the rotary table, and the rotary table is a flat plate portion on which a crushing roller is mounted. And an outer peripheral cylindrical portion that extends below the outer periphery of the flat plate portion and whose lower end is supported by the hydrostatic bearing, and an inner peripheral portion that extends below the central portion of the flat plate portion and that engages with the output shaft of the speed reducer and the lower end. With a shape that has a peripheral cylindrical portion .

[0008]

According to the present invention, the hydrostatic bearing for supporting the vertical load applied to the rotary table is arranged at the lower end of the outer peripheral portion of the rotary table, and the crushing force pressed by the crushing table by the dead weight of the rotary table or the outer periphery of the rotary table. A vertical load such as a force is transmitted almost vertically through the outer peripheral cylindrical portion and is supported by the hydrostatic bearing, while the rotational force is transmitted to the rotary table by the inner peripheral cylindrical portion engaged with the output shaft of the speed reducer. Therefore, there is little deformation of the rotary table due to vertical load, and the thermal strain at the lower end of the inner cylinder and the lower end of the outer cylinder due to the heat transfer by the high temperature raw material and the crushing heat applied to the flat plate part also causes the vertical crusher of the conventional structure. Since it is extremely small compared to the substantially flat plate-shaped rotary table used in, the static pressure bearing and the speed reducer are less affected by load deformation and thermal strain, and damage to the equipment and a longer life can be achieved.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 relate to an embodiment of the present invention,
1 is an overall vertical cross-sectional view of the vertical crusher, FIG. 2 is a vertical cross-sectional view of a main part of the vertical crusher, and FIG. 3 is a cross-sectional plan view taken along line AA of FIG. As shown in FIGS. 1 to 3, in the vertical crusher 1 of the present invention, a rotary table 3A is disposed inside an upright cylindrical casing 15 coaxially with the casing 15 so as to be rotatable around a vertical axis. A plurality of (four in the embodiment of FIGS. 1 to 3) crushing rollers 4 are mounted on the outer periphery of the rotary table 3A, and a bearing 6A is installed on the top of a stand 40 formed of a double cylinder. Arm 5 that can swing around the rotation axis 6 of
And it is pressed and driven by the hydraulic cylinder 9 on the rotary table 3A via the arms 7A and 7B. As shown in the figure, the rotary table 3A has a horizontal flat plate portion 3X having a vertical cross-section, and a substantially cylindrical outer peripheral cylindrical portion 3Y connected to the lower outer periphery of the flat plate portion 3X and a central portion through hole of the flat plate portion 3X. The inner peripheral cylindrical portion 3Z having a cylindrical shape that is connected to the lower side around the is integrated with the structure. Peripheral cylindrical portion 3 of rotary table 3A
A donut disk-shaped flange shoe 3B is fixedly installed on the lower side of Y, and is loaded on a thrust pad 30a attached to the top of the column base 30 arranged inside the stand 40. The vertical load received by the rotary table 3A is transmitted to the thrust pad 30a and the column base 30 while sliding on the lower surface of the flange shoe 3B and the upper surface of the thrust pad 30a during rotation. In addition, a cylindrical rotary cylinder 3C having a flange at the top is integrally projectingly provided on the lower side of the inner peripheral cylindrical portion 3Z of the rotary table 3A together with the rotary table 3A, and extends obliquely upward and inward from the column base 30. It is fitted to a support ring 30b fixed in a cylindrical fixing ring 30B supported by a plurality of circumferential stays 30A,
The sliding surface between the rotary cylinder 3C and the support ring 30b is lubricated similarly to the upper surface of the thrust pad 30a. The role of the upper surface of the thrust pad 30a and the inner surface of the support ring 30b forming these two sliding surfaces is that the upper surface of the thrust pad 30a mainly supports the vertical load, while the inner surface of the support ring 30b is loaded on the rotary table 3A. This is to prevent the rotary table 3A from tilting or moving horizontally due to the eccentric load, and to make the vertical load equal to the circumference. The thrust pad 30a may be formed in the shape of a donut disk, but normally it is locally arranged immediately below each crushing roller 4. The thrust pad 30a is also called a hydrostatic bearing, and the material is white metal (WJ2), phosphor bronze,
Lead bronze, cadmium alloy, etc. can be adopted.

On the other hand, the rotary drive of the rotary table 3A is performed by rotating a spur gear which is screwed on the outer periphery of the output shaft 2a of a speed reducer (a planetary speed reducer in this embodiment) 2 disposed directly below the center of the rotary table 3A. It is performed by meshing with the internal gear mounted on the inner peripheral surface of the cylinder 3C, and the vertical load applied to the rotary table 3A is not transmitted to the reduction gear 2. In the vertical crusher 1 of the present invention configured as described above, the rotary table 3A is rotationally driven via the inching motor 2A, the motor 2B, and the planetary speed reducer 2, and the raw material is charged into the raw material chute 17
And, it is dropped just before each crushing roller 4 via the branch pipe 17A, crushed between the rotary table 3A and the crushing roller 4, overflows the rotary table 3A and drops into the annular space passage 14, and is scraped by the scraper 18. It is scraped and discharged from the machine through a raw material discharge port (not shown). In addition,
The branch pipe 17A is provided with a plurality of weir plates 17B in the lower half to store the raw material and form a material cushion in order to prevent abrasion of the raw material having a strong abrasion property such as a clinker.

Next, thermal deformation of the rotary table will be described. Applicants have found that high temperature raw materials, such as 80 ° C. to 15 ° C.
Regarding the thermal deformation of the rotary table when clinker was crushed at 0 ° C and 200 ° C at maximum, an analysis by the finite element method (NASTRAN) was attempted in consideration of the load condition and the temperature condition of the actual operating condition. When the same boundary condition was given to the rotary table 3A for each of a dozen types and the thermal deformation state was observed, it was found that there was a large difference in thermal deformation depending on the shape. Here, a conventional flat plate type rotary table 3A (TYPE)
Rotating table 3A (TYPE) with the least thermal deformation (TYPE)
B) and the rotary table 3A (T
The analysis result of YPE C) is shown. 4 to 6 each show T
The analysis results of the rotary table 3A of YPE A, TYPE B, and TYPE C are shown. The result shows that the thermal strain in the vicinity of the hydrostatic bearing 30a was 1100 μm in TYPE A, but was drastically reduced to 300 μm in TYPE B. (About 600 μm for TYPE C). Judging from the above results, not the conventional flat plate type TYPE A, but the rotary table 3A having a shape in which the outer peripheral cylindrical portion 3Y and the inner peripheral cylindrical portion 3Z are respectively connected to the flat plate portion 3X and which has a certain height ( It has been found that the present invention) is desirable from the standpoint of eliminating thermal effects. Further, in TYPE B, it has been found that the thermal strain can be kept small even if the thickness of the outer peripheral cylindrical portion 3Y is made considerably thin within the range that the rigidity allows, so that the cost can be reduced by reducing the weight. As described above, in the vertical crusher 1 according to the present invention, the vertical weight is not applied to the speed reducer 2 unlike the conventional structure, and the weight is applied by the own weight of the rotary table 3A and the hydraulic cylinder 9 separately from the planetary speed reducer 2. It has a mechanism to support vertical load such as crushing force. Therefore, the planetary speed reducer 2 need only have a function of transmitting rotational torque for rotational drive,
The size can be reduced by that much, and it is less affected by the vibration phenomenon due to the load change during the crushing work, damage due to vibration trouble is reduced, and a long life is achieved. Also,
Since the rotary table is formed to have a small thermal deformation, troubles due to the thermal influence of the hydrostatic bearing and the speed reducer can be prevented.

[0012]

As described above, according to the present invention, the reduction gear can be reduced in size and weight, the facility cost can be reduced, and the reduction gear trouble due to the abnormal vibration during crushing can be avoided, and the maintainability can be improved. Is improved. Further, the vertical crusher of the present invention can minimize the thermal influence on the hydrostatic bearings and the speed reducer and prevent the speed reducer trouble and the bearing trouble from occurring, so that the maintainability is improved and continuous stable operation is maintained. Productivity is improved.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view of a vertical crusher according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a vertical crusher according to an embodiment of the present invention.

3 is a cross-sectional plan view taken along the line AA of FIG.

FIG. 4 is a thermal strain analysis state diagram of the rotary table according to the embodiment of the present invention.

FIG. 5 is a thermal strain analysis state diagram of the rotary table according to the embodiment of the present invention.

FIG. 6 is a thermal strain analysis state diagram of the rotary table according to the embodiment of the present invention.

FIG. 7 is an overall vertical cross-sectional view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical grinding machine 2 Reduction gear (planetary reduction gear) 2A Jig motor 2B Electric motor 2a Output shaft 3A Rotary table 3B Flange shoe 3C Rotating cylinder 3S Dam ring 3X Flat plate part 3Y Outer peripheral cylinder part 3Z Inner peripheral cylinder part 4 Grinding roller 5 Arm 6 axis (rotary shaft) 7 Arm 7A Arm 7B Arm 9 Hydraulic cylinder 14 Annular space passage 15 Casing 16 Discharge port 17 Raw material charging chute 17A Branch pipe 17B Weir plate 18 Scraper 30 Pillar 30A Stay 30B Fixing ring 30a Thrust pad (static) Pressure bearing) 30b Support ring 40 Stand

Claims (1)

[Claims] 1. A plurality of rotatable crushing rollers are provided on the upper surface of the outer peripheral portion of the rotary table, and the raw material supplied onto the rotary table is applied with a predetermined pressure to the rotary table and the peripheral surface of the crush roller. In a vertical crusher for crushing between the rotary table and the rotary table, a static pressure bearing that bears a vertical load such as a self-weight and a crushing force applied to the rotary table is arranged at the lower end of the outer periphery of the rotary table, and the rotary table is A decelerator that is rotationally driven is disposed below the center of the rotary table, and the rotary table extends below the flat plate portion on which the crushing roller is mounted and the outer periphery of the flat plate portion, and the lower end of the static pressure bearing is provided. A vertical crusher having a shape including an outer peripheral cylindrical portion supported and an inner peripheral cylindrical portion extending below the central portion of the flat plate portion and engaging the output shaft of the reduction gear with the lower end.