JPS6119306B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention enables each grinding roller to be pressed against a rotary table efficiently and accurately according to its grindability, and reduces the weight of the crushing roller reduction device. The present invention relates to a vertical roller mill that can be propelled, and that allows easy maintenance and inspection by making it easy to take out the crushing rollers from the casing.

[Conventional technology]

In general, a vertical roller mill is a device that grinds lump-like materials to be crushed, such as cement raw materials or coal, into granules or powder. The pulverized material is pulverized between the pulverized roller and the casing, and the pulverized material is blown upward into the casing along with hot gas, and is classified by a separator to take out the desired fine particles out of the casing.

In conventional vertical roller mills, the following two methods are used to press the grinding roller onto the rotary table.
Two methods have been proposed.

(1) Insert the swing arm into the casing from outside the mill casing, attach a roller to its tip, raise the swing arm using a hydraulic cylinder, and press the roller against the table (Rotsusier type mill).

(2) One press ring (round or triangular) is placed on three rollers, and the press ring is pressed down from three locations with hydraulic cylinders to press the rollers together (fire mill).

[Problem that the invention seeks to solve]

In method (1) above, the roller is pushed down from a distance via the swing arm by a hydraulic cylinder outside the casing, so the swing arm needs to be able to withstand a huge pulling force, making it extremely large and heavy. In order to eliminate this drawback, if the distance between the casing and the rollers is narrowed, the powder concentration will increase and the resistance to the flow of hot gas blown upward will increase, resulting in an increase in pressure loss. Also (2)
In this method, one press ring presses three rollers, so the press ring is large and heavy. Furthermore, if one roller is lifted by the object to be crushed, the crushability of the other rollers will be adversely affected. Further, in order to replace the roll liner, the heavy press ring must be removed from the casing, which is a time-consuming process.

[Purpose of the invention]

The present invention was devised in order to effectively solve the above-mentioned conventional problems, and its purpose is to efficiently and accurately press the grinding rollers onto the rotating table according to the grindability of each grinding roller. This makes it possible to reduce the weight of the crushing roller rolling device, and
To provide a vertical roller mill in which a crushing roller can be easily taken out of a casing and maintenance and inspection can be easily performed.

[Summary of the invention]

In order to achieve the above object, the present invention includes a rotary table rotatably supported within a cylindrical casing, and crushing rollers disposed on the rotary table at appropriate intervals along the rotation direction of the rotary table. The material to be crushed, which is supplied onto the rotary table, is crushed between the rotary table and a crushing roller that is pressed against the rotary table, and the crushed material is blown upwards into the casing together with hot gas to classify it and obtain the desired fine particles. In a vertical roller mill that can be taken out from the casing, a door for taking out the grinding rollers is provided at a position facing each grinding roller on the inner circumferential wall of the casing, one end of each door is rotatably supported, and the other end is supported on each door. An arm extending above the rotary table is provided, and a roller bracket is provided which is swingably connected to each arm and supports a crushing roller that rotates following the rotary table. The grinding roller is connected to one side of a pulling mechanism that pulls down the grinding roller substantially parallel to the direction in which it is pressed against the grinding roller, so that the grinding roller is brought into pressure contact with the rotary table via the bracket.

〔Example〕

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, 1 is a cylindrical casing, and a reducer 3 is mounted on a bottom base 2 inside the casing 1.
is provided. A rotary table 4 is provided on the reducer 3 and is configured to reduce the rotation speed of an electric motor (not shown) by the reducer 3 and transmit it to the rotary table 4. An annular groove 5 as shown in the figure is formed in the upper peripheral edge of the circular rotary table 4, and crushing rollers 6 are disposed along the groove 5 at appropriate intervals. A door 7 for taking out the rollers is provided at a position facing each roller 6 of the casing 1, and the door 7 is configured to be openable and closable about a door opening/closing pin 8 as a pivot.

A support bracket 9 is provided on the inner wall of the door 7,
An arm 11 is provided on the support bracket 9. One end of the arm 11 is rotatably supported by a pin 10, and the other end extends above the crushing roller 6. In this embodiment, as shown in FIG. 2, two arms 11, 11 configured in this manner are arranged parallel to each other for each roller 6. Arm 11, 11
A lever 12 is interposed between the tips of the lever 12, and hooks 13, 13 are attached to both end sides of the lever 12, respectively. The roller 6 has a rotating shaft 1 of the roller 6.
A roller bracket 15 is provided which supports the roller 4. Cylindrical rollers 16, 16 are disposed between the bottom surface of the lever 12 and the top surface of the roller bracket 15, respectively, with their cylindrical axes perpendicular to the rotational axis 14 of the rollers, and the rollers 16, 16 are installed at positions corresponding to the rollers 16, 16, respectively. , bent portions (bearings) are formed on the bottom surfaces of the levers 12, 12 and the top surface of the roller bracket, respectively. The roller 6 is configured to be able to swing around the roller 16 as a fulcrum.

The traction mechanism 17 that pulls down the lever 12 below the table 4 is mainly composed of a hydraulic cylinder 18, a tension rod 19, and a shackle 20.
A hydraulic cylinder 18 is connected to a bottom bracket 21 fixedly mounted on the base 2 in order to pull the shackle 20 hooked onto the hook 13 of the lever 12 via the tension rod 19. The tension rod 19 is adapted to be pulled substantially parallel to the direction in which the roller 6 is brought into pressure contact with the rotary table 4.

An annular duct for supplying hot gas is used to blow up the crushed material crushed between the rotary table 4 and the crushing roller 6 and sent to the peripheral edge of the table 4 along with the hot air flow blown upward from the casing 1. 22 is arranged around the entire lower surface of the table 4, and furthermore, a crushed table 4 is disposed on the outer circumference of the table 4.
An annular nozzle ring 23 is provided as a hot gas ejection port for blowing upward the discharged powder. The tension rod 19 passes through the annular duct 22, and the tension rod 19
A protective tube 25 covering the tension rod 19 protects the tension rod 19 from the hot gas supplied to the annular duct 22.
is provided. The protection tube 25 includes a protection tube 25
In order to seal between the duct 22 and the duct 22, a rose-shaped sealing portion 26 is formed. In this embodiment, the pulling down device for the crushing roller 6 mainly includes the pulling mechanism 17, the arm 11, the lever 12, and the roller bracket 15.

Next, the operation of this embodiment will be described.

A shackle 20 is hooked to the hook 13,
By pulling the shaft 20 by the hydraulic cylinder 18 via the tension rod 19, the roller bracket 15 is pushed down via the arm 11, the lever 12, and the roller 16, and the crushing roller 6 is pressed onto the groove 5 of the table 4. Ru. The roller 6 that is pressed against the rotary table 4 rolls following the rotation of the table 4, and the material to be crushed that is supplied onto the table 4 is crushed between the roller 6 and the table 4. The pulverized material is sent upward along with a hot air stream blown up from the nozzle ring 23, and is sorted by a separator provided at the upper part of the casing 1, and only fine powder is taken out of the casing 1.

In this way, since each roller 6 is pulled from above in a direction substantially parallel to the roller rolling direction perpendicular to the rotation axis of the roller 6, the pulling mechanism 17
The traction force acts directly on the roller 6, so that the roller 6 can be pulled down efficiently without loss. Furthermore, since the axial distance of the arm 11 between the traction reduction application point (shackle 13) of the traction mechanism 17 and the pressure contact point or crushing load point of the roller 6 on the rotary table 4 is short, the arm 11
No large load is applied to the That is, arm 11
functions to support the roller 6 rather than to transmit the traction force of the traction mechanism 17. Therefore, arm 11, pin 10,
The support bracket 9 etc. need only have a simple structure, small size, and light weight.

Moreover, since a door 7 for taking out the rollers is provided at a position facing each roller 6 of the casing 1, the rollers 6 can be easily taken out by opening the door 7. Moreover, since the arm 11 is small and lightweight for supporting the roller 6, the door 7 that supports one end of the arm 11 can also be a simple and lightweight one.
When replacing the roll liner of roller 6, open door 7.
The lever 27 attached to the roller bracket 1
The roller 6 is connected to the door 7 by being hooked to the hook 28 provided on the door 5, and the door 7 is connected to the door opening/closing pin 8.
When the roller 6 is rotated around and opened, the roller 6 can be taken out of the casing 1 together with the door 7, and the roll liner can be easily replaced.

Further, since the arm 11 is small, the flow resistance to the hot gas blown up from the nozzle ring 23 is small, and the pressure loss due to the arm 11 is small. In particular, since the arm 11 is located above the roller 6, there is sufficient space above the nozzle ring 23 for spraying, and the concentration of the powder becomes thinner as it goes upward, resulting in less pressure loss.

Furthermore, even if one roller is lifted upward due to the accumulation of materials to be crushed during crushing, roller 1
The rollers can swing about 6 as a fulcrum, and the load applied to each roller is averaged, so that no unbalanced load is applied to that roller, and no inconvenience such as other rollers floating occurs. (However, it is assumed that the rollers cannot swing freely at all; for example, the lever 12 and the roller bracket 15 are connected by a connector with play, and the allowable swing range thereof is set in advance. ) Furthermore, since the arm 11 is provided extending substantially horizontally, even if the roller 6 moves up and down, the table 4 of the tension rod 19 will only have a small swing in the radial direction.
The clearance between the annular duct 22 and the annular duct 22 may be small, and the sealing performance within the casing is good. Further, since the arm 11 and the like are provided within the casing 1, a simple measure for sealing the casing is sufficient.

In the above embodiment, an elastic member may be provided near the roller 16 so that even if the roller 6 swings about the roller 16, it returns to its original position.

〔Effect of the invention〕

As is clear from the above description, the present invention exhibits the following excellent effects.

(1) Since the crushing roller is pulled from above in a direction almost parallel to the direction in which it is pressed against the rotary table,
The traction force of the traction mechanism acts directly on the crushing rollers, allowing efficient roller traction pressure with no loss and improving the crushing capacity of the vertical roller mill.

(2) The traction force of the traction mechanism acts directly on the crushing roller without loss, and no large load is applied to the arm, so the arm, arm pivot, door, etc. can be made simple, compact, and lightweight. I can do it,
The weight of the device can be significantly reduced.

(3) A door for taking out the crushing rollers is provided at the position facing each crushing roller in the casing, and since the rolling down device including the door is lightweight, it is easy to replace the roll liner, and the roll liner is also easily worn out. It is economical to only exchange things.

(4) Since the arm is installed inside the casing, the casing seals well.

(5) Since the crushing rollers are configured to be able to swing in the radial direction of the rotary table, even if one roller is lifted due to the accumulation of materials to be crushed during crushing, there will be no excessive load on that roller. The rollers can be moved to a position where this does not occur, and all rollers can maintain uniform grinding performance. Furthermore, since each crushing roller is individually pulled, there is no interference between the crushing rollers.

[Brief explanation of the drawing]

FIG. 1 is a partial side sectional view of the device according to the present invention, and FIG. 2 is a perspective view of the main part thereof. In the figure, 1 is a casing, 4 is a rotary table, 6
is a crushing roller, 7 is a door, 9 is a support bracket, 1
0 is a pin, 11 is an arm, 15 is a roller bracket, 16 is a roller, 17 is a traction mechanism, 18 is a hydraulic cylinder, and 19 is a tension rod.

Claims (1)

[Claims] 1 A rotary table rotatably supported in a cylindrical casing, and crushing rollers disposed on the rotary table at appropriate intervals along the rotation direction, and the material supplied onto the rotary table is In a vertical roller mill, the pulverized material is pulverized between a rotary table and a pulverizing roller pressed against the table, and the pulverized material is blown up above the casing together with hot gas for classification and the desired fine particles are taken out of the casing. A door for taking out the grinding rollers is provided at a position facing each grinding roller on the inner circumferential wall of the casing, and an arm is provided on each door, one end of which is rotatably supported and the other end of which extends above the rotary table. A roller bracket is provided for supporting a crushing roller that is swingably connected to each arm and rotates following the rotary table, and is lowered to the arm above the crushing roller substantially parallel to the direction in which the crushing roller is pressed against the crushing roller. Connect one side of the traction mechanism,
A vertical roller mill characterized in that a crushing roller is configured to be pressed against a rotating table via a bracket.