JPH04171055A - Vertical grinder - Google Patents

Abstract

PURPOSE:To hold the inner surface of a raw material charging chute in a clean state by concentrically connecting a short pipe whose diameter is smaller than that of the raw material charging chute to the upper end of the raw material charging chute and providing an elevatable annular cutter in the raw material charging chute. CONSTITUTION:A short pipe 17b is connected to the upper end of a raw material charging chute 17 and a stepped part 17c is formed. An annular weight 110 and the annular cutter 120 connected thereto are received in the stepped part 17c and a wire 130 is guided by a pulley 140 to be connected to the electromotive winch 150 arranged on the outside of the casing of a vertical grinder. The weight 110 and cutter 120 within the raw material charging chute 17 can rise and fall in a vertical direction corresponding to the forward and reverse rotation of the electromotive winch 150. The cutter 120 is reciprocally moved along with the weight 110 along the inner surface of the raw material charging chute by the forward and reverse rotation of the electromotive winch 150 to make it possible to cut and detach the matter 50 adhering to the inner surface of the raw material charging chute 17.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides the following advantages:
This relates to a vertical crusher that crushes raw materials such as limestone, blast furnace slag, and cement raw materials.

[Conventional technology]

As a type of pulverizer that finely pulverizes raw materials such as limestone, blast furnace slag, and cement raw materials into powder, a vertical pulverizer 1 equipped with a rotary table and pulverizing rollers is widely used as shown in Fig. 3. ing.

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 a 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 that are swingably supported by a shaft 6 on the casing 1a, and by operating the hydraulic cylinder 9, the crushing roller 4 is 4 is pressed onto the rotary table 3A to apply crushing pressure to the raw material.

Further, as shown in FIG. 4, a bearing 8a that supports the shaft 6 and a bearing housing 8 that houses the bearing 8a are fixedly installed on the upper surface of the pedestal 20. 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 for blowing up gas around the rotary table 3A; 15
13 is a rotary separator for classifying the raw material crushed by the blades 13A, 16 is an outlet for taking out the product together with the gas, and 17 is a raw material input chute.

In such a vertical crusher, the raw material supplied to the center of the rotary table 3A by the raw material input chute 17 receives 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. rotary table 3
It receives a force in the rotational direction from A, slides between it and the rotary table 3A, and rotates at a speed somewhat different from the rotational speed of the rotary table 3A.Two forces of 0 or more, that is, forces in the radial direction and in the rotational direction, are combined, The raw material moves to the outer periphery of the rotary table 3A while drawing a spiral trajectory on the rotary table 3A. Since a roller is in pressure contact with this outer circumferential portion and rotates, the raw material drawing a spiral line enters between the crushing roller 4 and the rotary table 3A from a direction forming a certain angle with the roller axial direction and is bitten. crushed.

On the other hand, air is supplied to the base of the casing 1a by a duct.
Alternatively, gas such as hot air is introduced, and 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 entrained in the gas. The product rises inside the casing 1a and is subjected to a classification action by the blades 13A of the separator 13 located at the top, and products with a predetermined particle size are discharged together with the gas through the discharge port 16.
is discharged from the tank and sent to the next process.

[Problems to be Solved by the Invention] When grinding blast furnace slag, for example, in the conventional vertical crusher as described above, when the blast furnace slag contains moisture, the blast furnace slag has self-hardening properties, and this When entering the vertical pulverizer through the pulverizer, it adheres to and solidifies on the inner surface of the raw material input chute, which is heated by the hot air gas that is the drying heat source flowing inside the vertical pulverizer, and gradually develops into a passageway in the chute. This narrows or obstructs the flow of raw materials, hindering the smooth supply of raw materials.

The vertical crusher of the present invention is intended to remove raw materials adhering to the inner surface of the raw material input chute and maintain the inner surface in a clean state without stopping the operation.

[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, the raw material supplied via the raw material input chute that hangs directly above is crushed between the top surface of the rotating table and the circumferential surface of the crushing roller by applying a predetermined crushing pressure to the crushing roller. A short pipe having a diameter smaller than the diameter of the raw material inputting chute is concentrically connected to the upper end of the raw material inputting chute, and an annular weight having an inner diameter larger than the outer diameter of the short pipe is connected to the weight and the outer diameter thereof is connected to the raw material inputting chute. An annular cutter smaller than the inner diameter is provided inside the raw material inputting chute so as to be able to rise and lower, and a cleaning device is provided in which a wire connected to the weight is connected to an electric winch disposed outside the raw material inputting chute.

[Function] In the vertical crusher of the present invention, a short pipe with a small diameter extends above the raw material input chute, and a weight and a cutter having an inner diameter larger than the outer diameter of this short pipe are moved up and down inside the raw material input chute. The inner chute can be raised and lowered, and connected via wire to an electric winch installed outside, so that it can be raised and lowered as necessary during operation to scrape away deposits on the inner surface of the chute with a cutter. Can be cleaned. Furthermore, when the cleaning device is not in use, the weight and cutter are stored in the stepped portion of the short pipe connection section at the uppermost limit, so that raw materials can be supplied smoothly without interfering with the supply of raw materials.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIGS. 1 and 2 relate to embodiments of the present invention, with FIG. 1 being an overall vertical cross-sectional view of a vertical crusher, and FIG. 2 being an enlarged vertical cross-sectional view of a main part.

In the figure, 1 is a vertical crusher, 2 is a speed reducer, 2A is an electric motor, 3A is a rotary table, 3B is a dam ring, 4 is a crushing roller, 5 is an arm, 6 is a shaft, 7 is an arm, 8 is a bearing housing , 8a is a bearing, 9 is a hydraulic cylinder, 10 is a piston rod, 13 is a separator, 13A is a separator blade, 13B is a bearing, 14 is an annular space passage, 15 is a hot air blowing passage, 16 is an outlet, and 17 is a raw material input chute. As shown in FIG. 2, a flanged short pipe 17b having a diameter smaller than the diameter of the raw material input chute 17 is connected to the upper end of the raw material input chute 17 to form a stepped portion 17c. The stepped portion 17c has an annular weight 110 having an inner diameter larger than the outer diameter of the short pipe 17b, and an annular cutter 120 connected to the weight and having an outer diameter slightly smaller than the inner diameter of the raw material input chute 17. Stored and stepped part 1
The wire 130 is connected to a wire 130 that passes through a hole 17d provided in the crusher 7C, and the wire 130 is guided by a pulley 140 and then connected to an electric winch 1 installed outside the casing of the vertical crusher.
50.

Therefore, the weight 110 and the cutter 120 in the raw material input chute 17 are
can be raised and lowered in the vertical direction.

As described above, the deposits 50 on the inner surface of the raw material input chute 17
The cleaning device 100 for removing a weight 110. Cutter 120. Wire 130. Since the electric winch 150 is composed of a pulley 140 and an electric winch 150, the electric winch 150 is rotated in the forward and reverse directions at appropriate time intervals, for example, once every hour, 3 to 4 times during operation. is reciprocated along the inner surface of the raw material input chute 17 to cut off the deposits 50 on the inner surface of the raw material input chute 17. In this way, by operating the cleaning device 100 intermittently from the beginning of operation, the deposits 50 are less likely to grow or solidify, so that the deposits 5o can be easily removed without requiring a large force. can be excluded.

Furthermore, when the cleaning device 100 is not operating, the weight 110 and the cutter 120 are stored at the uppermost position, that is, directly below the stepped portion 17c, so that there is no obstruction to the passage of the raw material. This is convenient because it never happens. Note that by extending the end of the short pipe 17b and extending it into the raw material input chute 17 as shown in FIG. 2, it is possible to prevent the supplied raw material from coming into contact with the weight 110 or the cutter 120. , is preferable from the point of view of equipment protection.

Further, it is preferable that two electric winches 150 be provided on the left and right sides and operated in synchronization so that the weight 110 and the cutter 120 are raised and lowered while maintaining a horizontal state.

Note that a trumpet pipe 17a is provided at the lower end of the raw material input chute 17.
is attached to serve as a guide when the weight 110 and cutter 120 move upward from the lowest limit, but can be omitted if the weight 110 is not lowered to the lowest end of the raw material input chute 17.

[Effect of the invention] As explained above, in the vertical crusher of the present invention,
A cleaning device consisting of a cutter that slides on the inner surface of the raw material input chute is installed, so it can be operated intermittently during mill operation to constantly remove deposits from the inner surface of the raw material input chute, thereby preventing the buildup of deposits. Since the inner surface of the chute can be kept clean at all times, normal supply of raw materials is ensured.

[Brief explanation of drawings]

Figures 1 and 2 relate to embodiments of the present invention; Figure 1 is an overall vertical cross-sectional view of a vertical crusher, and Figure 2 is an enlarged vertical cross-sectional view of main parts showing another embodiment of the present invention. be. 3 and 4 show a conventional embodiment, in which FIG. 3 is an overall vertical cross-sectional view, and FIG. 4 is a side view taken along the line IV-rV in FIG. 1... Vertical crusher, 2... Speed reducer,
3A...Rotary table, 4...Crushing roller,
5... Arm, 6... Axis, 7
-... Arm, 8... Bearing housing, 17... Raw material input chute (separator rotating shaft), 17a... Trumpet tube, 17b...
... Short pipe, 17c... Stepped part, 17d... Hole, 50... Adhesive matter, 100... Cleaning device, 110... Weight, 120... Cutter, 130...wire, 1' 40...pulley,
150--Electric winch. Patent applicant: Ube Industries, Ltd. Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] (1) A plurality of rotatable crushing rollers are arranged on the upper surface of the outer periphery of the rotary table, and the raw material supplied via the raw material input chute hanging directly above the center of the rotary table is applied to the crushing rollers with 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, a short tube having a diameter smaller than the diameter of the raw material input chute is concentrically connected to the upper end of the raw material input chute, and an inner diameter of the short tube is A ring-shaped weight larger than the outer diameter of the tube and a ring-shaped cutter connected to the weight and having an outer diameter smaller than the inner diameter of the raw material input chute are provided in the raw material input chute so as to be movable up and down,
A vertical crusher equipped with a cleaning device in which a wire connected to the weight is connected to an electric winch installed outside the raw material input chute.