JPH0212149B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vertical pulverizer that pulverizes cement raw materials, coal, chemicals, etc. by cooperation of a rotating table and pulverizing rollers.

[Conventional technology]

2. Description of the Related Art Vertical crushers equipped with a rotary table and rollers are widely used as a type of crusher for finely crushing powders such as cement raw materials, coal, and chemicals. This type of crusher consists of a disk-shaped rotary table that is driven by a motor with a reducer to rotate at low speed in the lower part of a cylindrical casing, and a part that divides the outer circumference of the upper surface into equal parts in the circumferential direction, which is pressed by hydraulic pressure or the like. It is equipped with a plurality of rollers that are driven to rotate.

In this vertical crusher, powder as a raw material is supplied to the center of the rotary table through a supply pipe, and when the table rotates, the powder is subjected to centrifugal force in the radial direction of the table, and as it slides on the table, it is rotated by the table in the direction of rotation. It receives the force, slides between it and the table, and rotates somewhat slower than the table rotation speed. The above two forces, that is, the forces in the radial direction and the force in the rotational direction are combined, and the powder moves to the outer periphery of the rotary table while drawing a spiral trajectory on the table. Since the roller is in pressure contact with this outer periphery and is rotating, the particles with spiral lines enter between the roller and the rotary table from a direction forming a certain angle with the roller axis direction and are bitten. Smash.

On the other hand, hot air is guided to the base of the casing by a duct, and as this hot air blows up from the annular space between the outer circumferential surface of the rotary table and the inner circumferential surface of the casing, the fine powder is dried. It rises inside the casing, and is discharged from the outlet as a mixture with hot air and sent to the next process.

By the way, it is rare for the material to be crushed supplied to the crusher to be crushed into the fine powder particle size required by this crusher by being subjected to the crushing action by the crushing rollers only once, and the material may fall to the center of the rotary table. Not all of the crushed material is bitten by the crushing rollers, so even if the powder and granules that reach the outer peripheral edge of the rotary table rise up on the hot air current blowing up from the annular space, they will not be able to be crushed by the crusher. By the time the particles reach the separator installed at the top, depending on their particle size, they may fall or be classified and removed by the separator and returned to the rotary table.

In this way, the material to be crushed, which is constantly fed into the crusher, rises from the rotary table to the separator or passes through the rotary table until it reaches the desired fine powder particle size to become the final product and flows out of the crusher. The powder is gradually crushed by falling from the middle of the separator many times until it reaches the desired particle size.

By the way, in a vertical crusher, a frame body (hereinafter referred to as a pressure frame) is provided above the rollers with the axis alignment aligned with the table axis extension direction, and the rollers are attached to this pressure frame. There is a device in which a uniform downward biasing force is applied, thereby applying a uniform rolling force to each roller (Japanese Patent Laid-Open No. 152555/1983).

In a vertical crusher equipped with such a pressure frame, a means for applying and holding the pressure frame in a direction opposite to the table rotation direction is required.
Conventionally, this has been achieved by installing tension rods or compression rods between the pressure frame and the casing.

[Problem that the invention seeks to solve]

However, the pressure frame must be held so that it can move up and down in order to adjust the distance between the roller circumferential surface and the table surface. Therefore, a member or mechanism is required to make the pressure frame vertically movable.

[Means for solving problems]

The present invention provides a vertical crusher in which rollers are connected by a pressure frame, in which a feed pipe for the material to be crushed is installed vertically from above the casing into the pressure frame coaxially with the table, and is connected to the inner circumferential surface of the pressure frame. A stopper is provided protruding from the outer peripheral surface of each feed pipe, and the pressure frame is locked to the casing by engaging both stoppers through bearings.

[Effect]

In the present invention, the pressure frame is locked to the casing by engagement through the bearings of the stoppers provided protrudingly from the pressure frame and the inner surface of the casing, so there is no need to use a complicated mechanism or member. , vertical movement of the pressure frame is allowed.

〔Example〕

1 and 2 show an embodiment of a vertical crusher according to the present invention, FIG. 1 is a schematic vertical cross-sectional view of the whole, and FIG. 2 is a cross-sectional view taken along the line of FIG. 1. .

In these figures, the crusher 1 is equipped with a casing 20 that houses the entire crushing section such as a rotary table 3, which will be described later. and a middle casing 20b having an internal cone 20c with a circular cross-section drawn in the middle;
It has an upper casing 20d joined to its upper end.

A reducer 2 with a motor is disposed in the center of the lower casing 20a, and a rotary table 3 formed in a disc shape is attached to the output shaft facing upward. It is driven and rotates clockwise when viewed from above in FIG. A plurality of roller boss arms 5 are arranged at the upper outer peripheral end of the rotary table 3, and each of the roller boss arms 5 has a truncated conical crushing roller 4 pivotally attached to its lower end, which is pivoted in a substantially horizontal state. There is.

A pressure frame 6 having an annular shape (an annular shape in this embodiment) is fixed on the upper surface of the upper inner circumferential end of the roller boss arm 5 by tightening bolts or the like, and a plurality of crushing rollers 4 and a roller The boss arm 5 and the pressure frame 6 are integrally formed and mounted on the upper surface of the rotary table 3. On the other hand, the upper outer peripheral end of each roller boss 5 is connected to a pin 7 and a fork end 7.
The connecting rod 8 and turnbuckle 9 are rotatably connected by a.
The lower end of the hydraulic cylinder 10 is connected to a base plate 13 through a rotating pin 11 and a rotating seat 12.

Each crushing roller 4 is rotatably supported on a roller boss 5 via a roller shaft 4a, and its peripheral surface is in contact with the outer peripheral surface of the upper end of the rotary table 3, so that it is driven as the rotary table rotates. It is rotatable.

On the other hand, above the center of the rotary table 3, a raw material supply pipe 16 is vertically disposed, supported by an upper casing 20d via a final refined powder discharge pipe 22, and around this raw material supply pipe 16. A separator 15 formed of an inverted conical cylinder is supported on the middle casing 20b by a stay (not shown). A plurality of movable vanes 15a are arranged evenly in the circumferential direction on the outer circumferential upper surface of the upper end of the separator 15 for applying swirling force to the incoming dust gas, and a shaft 15b and a handle are supported at one end by a bearing 15c. 15d, it can be rotated and adjusted from the outside.

Furthermore, an annular hot air passage 21 is provided below the outer periphery of the rotary table 3 and is connected to the hot air generator through a duct 18. Above the hot air passage 21, the rotary table 3 and the casing 2
0a, an annular space 14 is defined by an inner circumferential wall 14a and an outer circumferential wall 14b. In this annular space 14, a plurality of plate-shaped blades 14c are arranged and fixed at equal intervals around the circumference while maintaining a required inclination angle with respect to the horizontal plane.

In addition, a discharge chute 19 is installed at the bottom of the hot air passageway to temporarily discharge foreign matter during crushing and surplus materials to be crushed in the event of overload, and a discharge door 19b that is rotatable around a rotating pin 19a. The structure allows for easier removal.

In this embodiment, the lower end of the supply pipe 16 extends downward through the inside of the pressure frame 6, and the pressure frame 6, which integrally fixes the plurality of roller bosses 5, has a stopper. It is locked to the supply pipe 16 by 17a and 17b. That is, as shown in FIG. 2, stoppers 17a are provided on the inner peripheral surface of the pressure frame 6 at equal circumferential locations (three locations in this embodiment), and stoppers 17a are provided on the outer peripheral surface of the supply pipe 16. A stopper 17b is provided in a protruding manner at a position corresponding to the stopper 17b, and both stoppers 17a and 17b are engaged with each other via a bearing 17d. Note that reference numeral 17c in FIG. 2 is a reinforcing member that backs up the stopper 17b.

The operation of the crusher configured as above will be explained next.

After starting the reducer 2 with a motor to rotate the rotary table 3, the material to be crushed is supplied from the supply pipe 16 to the center of the upper surface of the rotary table 3 while maintaining airtightness by a conveyor such as a conveyor (not shown). Then, due to the rotation of the rotary table 3 and the centrifugal force of the rotation, the object to be crushed draws a spiral trajectory and moves toward the outer periphery of the rotary table 3. rotary table 3
Since the crushing roller 4 is rotating on the outer periphery of
Most of the moved material to be crushed is caught between the crushing roller 4 and the rotary table 3, and is crushed into fine powder by compression, impact, and shearing action. This fine powder, coarse particles and intermediate particles that are not bitten by the crushing roller 4 and come off the periphery of the rotary table 3 fall into the annular space 14, but at this time, they are sent through the duct 18 by the hot air generator. Since the hot air blows up from the hot air passage 21 into the annular space 14, these fine powders and intermediate particles rise inside the crusher together with the hot air. The rising fine powder and intermediate particles rise between the separator 15 and the inner cone 20c of the casing, change their course direction horizontally near the top of the upper casing 20d, and move along the set inclination of the movable vane 15a. It swirls and flows in.
In this way, the fine powder that has reached the desired fine powder particle size, which has been classified by the centrifugal classification action of the separator, is sent to the next step via the discharge pipe 22. On the other hand, coarse powder that does not reach the fine particle size slides down the inner surface of the separator and accumulates near the flap 15f whose upper end is rotatably supported on the skirt 15e fixed to the side wall of the supply pipe 16, and due to the action of gravity. While pushing this flap 15f away, it slides down the inner surface of the lower chute 15g and falls onto the upper surface of the rotary table 3.

As the table 3 rotates, the force applied to the pressure frame via the crushing roller in the table rotation direction is opposed by the stoppers 17a and 17b, thereby locking the pressure frame.

Further, since the engagement method is such that a bearing 17d is interposed between the stoppers 17a and 17b, vertical movement of the pressure frame is also allowed.

FIG. 3 is an enlarged view showing an example of the engaging portions of the stoppers 17a, 17b. In this example, as shown in FIG. 4, a bearing 17d in which a cylindrical roller 17e is pivotally supported on a bearing seat 17f is attached to a stopper 17a, and the roller 17e is configured to abut against the side surface of the stopper 17b. FIG. 5 is a diagram showing a different example of the bearing. In this example, a groove 17g slightly larger than a semicircle is provided in the stopper 17a as shown in FIG.
h, and this ball 17h hits the stopper 17b.
The structure is such that it comes into contact with the side surface of the

In the above embodiment, the type of separator is a fixed movable vane type centrifugal type, but a rotor type rotating type may be adopted. Further, the liner of the rotary table may not be a flat type, but may be of an inclined type or a plate type, and the corresponding crushing roller may be changed to a type that is compatible with these types.

〔Effect of the invention〕

As is clear from the above description, the present invention locks a pressure frame in a vertical crusher by engaging a stopper protruding from the pressure frame and the inner surface of the casing. The locking means can be simplified,
Effects such as reduction in equipment configuration cost of the vertical crusher and easier maintenance management can be obtained.

[Brief explanation of drawings]

FIG. 1 is an overall schematic cross-sectional view showing one embodiment of a vertical crusher according to the present invention, FIG. 2 is a cross-sectional view taken along the line shown in FIG. 1, and each of FIGS. 3 to 6 shows a stopper FIG. 3 is a configuration explanatory diagram of an engaging portion. 1... Vertical crusher, 3... Rotating table, 4... Grinding roller, 6... Pressure frame, 14... Annular space, 15g
...Separator shoot, 17a, 17b...Stopper, 17d...Shock absorber.

Claims (1)

[Claims] 1. A rotary table, a plurality of crushing rollers arranged on the rotary table, and
In this pulverizer equipped with a pressure frame that connects the plurality of pulverizing rollers, a feed pipe for the material to be pulverized is installed vertically from above the casing into the pressure frame coaxially with the table, and is connected to the inner peripheral surface of the pressure frame. A vertical crusher characterized in that a stopper is provided protruding from the outer peripheral surface of a feed pipe, and a pressure frame is locked to a casing by engaging both stoppers through bearings.