JPH04256449A - Vertical crusher - Google Patents

Abstract

PURPOSE:To prevent the generation of vortex in a hot gas duct, to reduce pressure drop and to enhance pulverizing efficiency by providing a curved guide vane for straightening introduced gas in the rotating direction of the rotating table freely rotatable to around the vertical shaft, in inner part of inlet port of the hot gas duct. CONSTITUTION:Plural guide vanes 50 curved in the rotting direction of the rotating table and causing the drift of air flow are fitted freely rotatable around the rotating shaft 50a at almost centered position in inlet port 30 of the circular hot gas duct 32. Accordingly, the collision of introduced gases between themselves in the hot gas duct and the generation of vortex are eliminated, and the gas is allowed to flow smoothly and accended almost uniformly to a blowing up passage of hot air to distribute. Accordingly, stabilized pulverization is operated continuously to improve the pulverization efficiency and the pressure drop is reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical pulverizer for pulverizing raw materials such as limestone, blast furnace slag, and cement raw materials through the cooperation of a rotary table and pulverizing rollers.

0002

[Prior Art] As a type of pulverizer that finely grinds raw materials such as limestone, blast furnace slag, and cement raw materials into powder,
As shown in FIG. 4, a vertical crusher 1 equipped with a rotating table and crushing rollers is widely used. This type of crusher includes a disc-shaped rotary table 3A that is driven by a motor 2A and a reducer 2 to rotate at low speed in the lower part of a cylindrical casing 1a, and a hydraulic pressure installed at a portion that equally divides the outer periphery of the upper surface in the circumferential direction. The crushing roller 4 is provided with a plurality of crushing rollers 4 that are pressed against each other and rotated as a result of rotation.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7 which are pivotally supported by a shaft 6 on the casing 1a, and when the hydraulic cylinder 9 is actuated, the crushing roller 4 is , the crushing roller 4 is pressed onto the rotary table 3A to apply crushing pressure to the raw material. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A to adjust the raw material layer pressure, 14 is an annular space passage around the rotary table 3A for blowing up gas, 15 is a hot air blowing passage, and 13 is a raw material pulverized by the blade 13A. 16 is an outlet for taking out the product together with the gas, and 17 is a raw material input chute. In addition, as shown in FIGS. 5 and 6, an annular hot gas duct 32 is provided below the outer periphery of the rotary table 3A, and the left and right intake ports 30,
Hot gas or air is introduced from 30.

[0004] In such a vertical crusher, the raw material supplied to the center of the rotary table 3A through the raw material input chute 17 is subjected to centrifugal force in the radial direction of the table due to the rotation of the rotary table 3A, and flows over the rotary table 3A. When it slides, it receives a rotational force from the rotary table 3A, slides between it and the rotary table 3A, and rotates somewhat slower than the rotation speed of the rotary table 3A. The above two forces, that is, the forces in the radial direction and the force in the rotational direction are combined, and the raw material moves to the outer circumference of the rotary table 3A while drawing a spiral trajectory on the rotary table 3A. A roller is pressed against this outer periphery and rotates, so the raw material drawn in the spiral line is transferred to the crushing roller 4.
The particles enter between the roller and the rotary table 3A from a direction forming a certain angle with the axial direction of the roller, and are bitten and crushed.

On the other hand, gas such as air or hot air is guided to the base of the casing 1a by a hot gas duct 32, and this gas flows through the annular space passage between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing. By blowing up from 14, the crushed fine powder is accompanied by gas and rises inside the casing 1a, and reaches the separator 1 located at the upper part.
The products having a predetermined particle size are discharged from the discharge port 16 together with the gas and sent to the next process.

It is desirable that the airflow rising from the hot gas duct 32 through the hot air blowing passage 15 by the suction force of the suction fan provided downstream of the vertical crusher 1 be distributed as evenly as possible around the outer circumference of the rotary table 3A. Therefore, it is desirable to provide as many intake ports 30 to the hot gas duct 32 as possible and to arrange them evenly. However, in reality, due to space constraints, only two diagonal locations can be provided.

[0007]

[Problem to be solved by the invention] Such an intake port 30
In a hot gas duct 32 with It appears that the hot air is almost evenly distributed to the annular hot air blow-up passage 15 and the annular space passage 14 located above. However, in reality, since the rotary table 3A is rotating at high speed, the impeller effect comes into play, and as shown in FIG. Vortices are generated at points P and Q shown in the figure, resulting in a large pressure loss and impeding the uniform distribution of airflow to the hot air blow-up passage 15. This phenomenon is undesirable because it ultimately leads to a decrease in grinding efficiency.

[0008]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the vertical crusher of the present invention has a plurality of rotatable crushing rollers arranged on the upper surface of the outer periphery of a rotary table, and the raw material is inputted. The raw material supplied via the chute is crushed between the top surface of the rotary table and the circumferential surface of the crushing roller by applying a predetermined crushing pressure to the crushing roller, and the powder and granules after being crushed are placed in a circle at the bottom of the outer periphery of the rotary table. In a vertical crusher that is transported along with an upward airflow supplied from an annular hot gas duct, the gas introduced into the hot gas duct is rotatable around a vertical axis inside the intake port of the hot gas duct and rectified in the direction of rotation of the rotary table. At least one bent guide vane is provided for this purpose.

[0009]

[Operation] One or more guide vanes are arranged at the intake port of the hot gas duct in the vertical crusher of the present invention to produce a drifted flow in the same direction as the rotational direction of the rotary table. Since it is provided so as to be rotatable around the axis, the introduced gases do not collide with each other inside the hot gas duct, and therefore flow smoothly without the generation of vortices, rising almost evenly to the hot air blowing passage and being distributed. As a result, the pressure loss of the gas in the hot gas duct is small, and the powder and granules after pulverization also ride the rising airflow evenly around the circumference and head toward the separator installed at the top of the pulverizer, resulting in less pressure loss inside the mill and stable production. Since pulverization is carried out continuously, pulverization efficiency is improved.

0010

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 relate to embodiments of the present invention, and FIG.
2 is a perspective view of the hot gas duct, FIG. 2 is a plan view taken along line II-II of FIG. 1, and FIG. 3 is a schematic plan view showing the airflow flowing inside the hot gas duct.

In the figure, the intake ports 30 and 30 of the annular hot gas duct 32 are each bent in the direction of rotation of the rotary table (clockwise in this embodiment) as shown in FIG. 3 to cause a bias in the airflow. A plurality of guide vanes 50 are arranged so as to be rotatable around a substantially central rotating shaft 50a, and are supported and attached to bearings 50b, 50b at the upper and lower ends. The upper end of the rotating shaft 50a is keyed to a link 60, and the other end of each link 60, 60,... is pin-jointed with a pin 61 through an elongated hole 62 provided in a horizontal connecting rod 76. It is arranged so that it can be held by sliding rings 74 and 75 and slid in the axial direction. A frame 70 having a three-arm rotor 71 rotated by a reduction motor and two diagonally arranged protrusions 72 and 73 in contact with the three-arm rotor 71 is connected between the sliding rings 74 and 75. There is. Note that the guide vane 50 is shown in Figure 3.
In addition to the shape shown in , a smoothly curved curved shape may also be used.

The operation of the vertical crusher 1 of the present invention constructed as described above will be explained. By energizing the reduction motor in the frame 70, the three-arm rotor 71 rotates clockwise, comes into contact with the side surface of the protrusion 72, moves it to the right, and connects the frame 70 and the connecting rod connected thereto. 76 moves the sliding rings 74 and 75 to the right, and as a result, each link 60 rotates clockwise. Thereafter, the frame 70 stops for a short time, but eventually the frame 70 moves to the left due to contact between the three-arm rotor 71 and another protrusion 73, and the link 60 rotates counterclockwise by a certain angle. In this way, the inclination of the guide vane 50 coupled to the link 60 via the rotating shaft 50a is controlled by the hot gas duct 3.
2, the position where the pressure loss of the airflow is the lowest is selected, and the deceleration motor is de-energized. As a result, the hot gas duct 32
The airflow inside becomes a laminar flow in the direction of rotation of the rotary table and rises almost evenly through the hot air blowing passage. Note that the behavior of the raw material inside the crusher is the same as described in the prior art, so the explanation will be omitted.

[0013]

[Effects of the Invention] As explained above, since rotatable guide vanes are arranged at the intake port of the hot gas duct in the vertical crusher of the present invention, there is no generation of vortices in the airflow flowing inside the hot gas duct. , a rectified laminar flow is formed in the same direction as the rotary table, so pressure loss is small and
An upward air current is created almost evenly around the outer circumference of the rotary table. Therefore, long-term continuous stable operation with little vibration is ensured.
Grinding efficiency is improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a hot gas duct according to an embodiment of a vertical crusher of the present invention.

FIG. 2 is a plan view taken from FIG. 1II-II showing a hot gas duct according to an embodiment of the vertical crusher of the present invention.

FIG. 3 is a schematic plan view showing airflow flowing in a hot gas duct according to an embodiment of the vertical crusher of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional vertical crusher.

FIG. 5 is an overall side sectional view of a conventional vertical crusher.

FIG. 6 is a schematic plan view showing airflow flowing in a hot gas duct of a conventional vertical crusher.

[Explanation of symbols]

1 Vertical crusher 3A Rotary table 4 Grinding roller 30 Intake port 32 Hot gas duct 50 Guide vane 50a Rotating axis 50b bearing 60 Link 61 pin 62 Long hole 70 frame 71 3 arm rotor 72 Protrusion 73 Protrusion 74 Sliding ring 75 Sliding ring 76 Connecting rod

Claims (1)

[Claims] Claim 1: A plurality of rotatable crushing rollers are arranged on the upper surface of the outer periphery of a rotary table, and a predetermined crushing pressure is applied to the raw material supplied through the raw material input chute to the crushing rollers to crush the raw material on the upper surface of the rotary table. In a vertical crusher, the powder and granules are crushed between the roller circumferential surface and transported along with an upward air current supplied from an annular hot gas duct placed at the lower part of the outer periphery of the rotary table. A vertical crusher characterized in that at least one guide vane is arranged inside an intake port of a gas duct and is rotatable around a vertical axis and bent in order to rectify introduced gas in the direction of rotation of a rotary table.