JPH04225848A - Vertical type crusher - Google Patents

Abstract

PURPOSE:To continuously keep the inside face clean by having gaps in the up and down directions at a bugle form or a cylindrical form of short pipes in a concentric circular form in the inside of a cylindrical outer jacket in the raw material throw-in chute, constituting a dual pipe construction arranged by overlapping them and injecting compressed air from the gaps of joints of the short pipes. CONSTITUTION:In the external pipe 17 and each short pipe 17B being made a dual pipe structure, an upper end of the external pipe 17 is connected with a rear face of a flange of the top pipe 17A and an outer wall of the short pipe 17B of the lowest place is connected with a circular bottom plate at the bottom end of the external pipe 17. The compressed air being flowed in from a flow-in port 50 of the compressed air provided at the upper place of the external pipe 17, is injected from the gaps facing downwards at the connecting parts between each of short pipes. Hence, even though a material is stuck to the inside of raw material throw-in chute during the operation, the compressed air is properly supplied from the flow-in port 50 and, by injecting the compressed air downwards from the gaps provided on the connecting parts of the short pipes 17B toward the inside of the short pipes 17B, the stuck material is peeled off and fall to keep the inside clean.

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. 5, a vertical crusher 1 equipped with a rotary 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.

[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, air or gas such as hot air is guided through a duct to the base of the casing 1a.
As this gas blows up from the annular space passage 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing, the crushed fine powder is carried along with the gas and moved into the casing 1.
The blade 1 of the separator 13 rises within a and is located at the top.
3A undergoes a classification action, and products with a predetermined particle size are discharged from the discharge port 16 together with gas and sent to the next process.

[0006]

[Problems to be Solved by the Invention] When using the above-mentioned conventional vertical crusher to crush blast furnace slag, for example, when moisture is mixed in the blast furnace slag, the blast furnace slag has self-hardening properties, and this causes the raw material input chute to become hard. When entering the vertical pulverizer through the pulverizer, it adheres to and solidifies on the inner surface of the raw material input chute heated by hot air gas, which is a drying heat source, flowing inside the vertical pulverizer, and gradually develops and forms a passageway in the chute. This may narrow or block the area, hindering the smooth supply of raw materials.

The vertical crusher of the present invention is equipped with a raw material input chute for removing raw materials adhering to the inner surface of the raw material input chute and keeping the inner surface clean.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the vertical crusher of the present invention has a plurality of rotatable crushing rollers disposed on the upper surface of the outer periphery of the rotary table, and In a vertical crusher that applies a predetermined crushing pressure to the crushing roller to crush the raw material supplied via the raw material input chute that hangs directly above it between the top surface of the rotary table and the circumferential surface of the crushing roller, the raw material input chute is , a cylindrical outer tube that is elongated in the vertical direction, and an inverted truncated tube that is arranged concentrically inside the outer tube and overlaps and is arranged continuously in the vertical direction while maintaining a gap with adjacent short tubes at the upper and lower ends. It is composed of a double tube consisting of a plurality of short tubes in the shape of a truncated cone or a cylinder, and an inlet for compressed air that is blown out from the gap between the short tubes is provided at the upper end of the outer tube.

[0009]

[Operation] The raw material input chute of the vertical crusher of the present invention has trumpet-shaped or cylindrical short tubes arranged concentrically inside a cylindrical outer cylinder, overlapping each other with gaps in the vertical direction. Since it has a double-tube structure and compressed air is ejected from the gap between the joints of each of the overlapping short tubes, the purge force of the compressed air can remove deposits that adhere to the inner surface of the raw material input chute during operation. It can be peeled off and the inner surface can be constantly kept clean.

0010

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. 1 to 4 relate to embodiments of the present invention, in which FIG. 1 is an overall vertical cross-sectional view of a vertical crusher, FIG. 2 is a vertical cross-sectional view of a main part of a raw material input chute, and FIG. 3 is a view taken along III-III in FIG. FIG. 4 is a longitudinal cross-sectional view of a main part showing another embodiment of the present invention.

In the figure, the outer tube 17 is a cylindrical pipe extending in the axial direction, and a flanged top tube 17A is disposed concentrically inside the outer tube 17, and a concentric top tube 17A is disposed below it. Short tube 17 with an inverted truncated cone shape (trumpet shape)
B overlaps the front and rear short pipes 17B at the upper and lower ends, and is continuously arranged so as to maintain an appropriate gap. Each short tube is connected to a plate-shaped bracket 17C extending between the outer circumference of the lower end of the short tube 17B and the inner circumference of the upper end of the next short tube 17B.

In this way, the outer tube 17 and each short tube 17B have a double tube structure, and the upper end of the outer tube 17 is connected to the top tube 17A.
The lower end of the outer tube 17 is connected to the outer wall of the lowermost short tube 17B by an annular bottom plate, and compressed air is injected from the compressed air inlet 50 provided at the top of the outer tube 17. The structure is such that compressed air is blown out from the downwardly facing gap between the connections between each short pipe.

In another embodiment shown in FIG. 4, straight short pipes 17B are used instead of the trumpet-shaped short pipes 17B. In this case, in order to ensure a gap between each short pipe, The diameter of the short tube increases as it goes downward.

Since the raw material input chute of the present invention is constructed as described above, even if there is deposits on the inner surface of the raw material input chute during operation, compressed air can be supplied from the inlet 50 as needed to close the short pipe connection. By jetting compressed air downward toward the inner surface of the short tube through the gap provided in the short tube, deposits are peeled off and fallen, keeping the inner surface clean.

[0015]

[Effects of the Invention] As explained above, by adopting the raw material inputting chute of the present invention, even if deposits are deposited on the inner surface of the chute during operation, the jetting force of compressed air can remove the deposits without stopping the chute. It is possible to keep the inner surface of the chute clean and maintain smooth supply of raw materials.

[Brief explanation of the drawing]

FIG. 1 is an overall vertical cross-sectional view of a vertical crusher of the present invention.

FIG. 2 is a longitudinal cross-sectional view of a main part of the raw material input chute of the present invention.

FIG. 3 is a cross-sectional plan view taken along III-III in FIG. 2;

FIG. 4 is a longitudinal sectional view of a main part of a raw material input chute showing another embodiment of the present invention.

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

[Explanation of symbols]

1 Vertical crusher 2　Reduction gear 3 Rotary table 4 Grinding roller 5 Arm 6 axis 7 Arm 8 Bearing housing 17 Raw material input chute (outer tube) 17A Top pipe 17B Short tube 50 Inlet

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 raw materials supplied via a raw material input chute hanging directly above the center of the rotary table are applied to the crushing rollers at a predetermined crushing pressure. In a vertical crusher that grinds between the top surface of a rotary table and the circumferential surface of a crushing roller while giving a It consists of a double tube consisting of a plurality of short tubes in the shape of an inverted truncated cone or a cylinder, which are overlapped and arranged continuously in the vertical direction while maintaining a gap with the adjacent short tubes at the upper and lower ends, A vertical crusher characterized in that an inlet for compressed air jetted out from gaps between the short tubes is provided at the upper end of the outer tube.