JPH0233877Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a split segment replacement device for a roller tire of a roller mill, and in particular, it detaches a split segment that has worn out due to wear from the roller tire and also reverses the split segment. This invention relates to a divided segment exchanging device for a roller tire that can be reattached and that can safely and easily perform reversal and replacement operations of divided segments.

[Conventional technology]

Generally, a roller mill is known as an apparatus for pulverizing a lumpy material to be pulverized, such as a cement raw material or coal, into granules or powder.

To explain this in detail based on the attached drawings, first, FIG. 1 is a vertical cross-sectional view showing a vertical roller mill, in which the crushed material is supplied onto a rotary table 2 rotatably provided in a mill casing 1. The material is pulverized between a rotary table 2 and a roller tire 3 which is tilted and supported in pressure contact with the rotary table 2, and the pulverized material is blown upward into the casing together with hot gas 4 supplied from below, and is classified by a separator 5 to form the desired material. It is now possible to obtain fine powder.

[The problem that the idea attempts to solve]

By the way, as shown in FIG. 2, the roller tire 3 has a ring-shaped rotating body 6 and a large number (approximately 8 to 12) of arc-shaped divided segments 7 divided along the circumferential direction of the circular rotating body 6. It is tightened and fixed with bolts 8. This divided segment 7 is made of wear-resistant material such as high chromium cast iron, but as it is operated, one side of the roller tire 3 wears down, so after operating for a predetermined time or after processing a predetermined amount of material to be crushed. The divided segment 7 is removed from the rotary body 6, reversed, and reinstalled so that the other side of the divided segment 7, which is not worn, is in contact with the rotary table 2.

In order to perform this work, as shown in FIG. 1, the roller tires 3 that were in contact with the rotary table 2 are moved outward and maintained in a horizontal state.
After that, an eye bolt (not shown) or the like is attached to each divided segment 7, and the bolt 8 fixing the segment is removed, and the segment 7 is lifted up and placed temporarily, and then turned over and attached again. There is.

By the way, in this work, each segment is extremely heavy, weighing approximately 1 ton, so it is very difficult to turn the segments over, and there is also the possibility of unforeseen accidents such as falling off, so safety precautions are required. This is not preferable, and furthermore, it takes a long time to work.

The present invention was devised to effectively solve the above-mentioned problems, and its purpose is to detach and move the divided segment from the roller tire while holding it, and to remove the divided segment from the roller tire. Roller mill rollers that can be rotated 180 degrees while being gripped, making it possible to quickly and easily perform segment reversal and replacement work, and to improve the safety of the work as much as possible. The present invention provides a tire segment replacement device.

[Means to solve the problem]

The roller tire of a roller mill, which is tilted and rotatably supported on a rotary table and consists of circular arc-shaped segments divided along the circumferential direction, is developed and moved to the outside of the rotary table in a substantially horizontal state to separate each divided segment. In this device, the unworn surface of the roller is replaced so that it is in contact with the rotary table, and the roller is suspended from a crane or the like and is movably supported facing the roller tire that has been rolled out and moved outside the rotary table. The vehicle is configured to include segment gripping means for gripping and separating the divided segments from the tire, and rotation means for inverting the gripped means while gripping the divided segments.

[Effect]

With the above configuration, it is possible to grip the divided segments constituting the roller tire with the gripping means and remove and transfer them from the roller tire, and then turn the divided segments in a gripped state by rotating the gripping means with the rotation means. By moving the gripping means toward the roller tire again, the inverted divided segment can be attached to the roller tire for assembly.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First of all, as shown in FIG.
The roller tire 3 is supported by a swing arm 10 on a swing arm 10 so that the roller tire 3 can be expanded to the outside of the rotary table 2 during replacement work. It has become possible to maintain the

The divided segment exchanging device 11 according to the present invention is used with the roller tire 3 maintained horizontally in this manner.

The entire device is suspended by, for example, a wire rope 12 of a crane (not shown), and is movable horizontally and vertically.

As shown in FIGS. 3 and 4, this device grips the divided segment 7 of the roller tire 3 and detaches it from the roller tire, or reinstalls the divided segment 7 which has been reversed by 180 degrees after being detached from the roller tire. It is mainly composed of a segment gripping means 13 for holding the split segment 7, and a rotation means 14 for turning the gripping means 13 upside down while the divided segment 7 is gripped.

First, the rotating means 14 is attached to a frame 15 which is bent vertically at an angle of approximately 90 degrees and whose upper portion is connected to the wire rope 12. Specifically, this rotating means 14 is
6 and a radial bearing 18 housed therein. The bearing box 16 is formed into a substantially cylindrical body with a large diameter, with both ends open, and is integrally attached to the lower end of the frame 15. The radial bearing 17, which is formed as a wide and large-diameter annular body, is provided inside the cylindrical bearing box 16 and inscribed therein. The rotating shaft 18 formed as a wide hollow cylinder is inserted or fitted into the bearing 17, and is rotatable.

At one end of this cylindrical rotating shaft 18, a disc-shaped support plate 19 extends in the radial direction of the rotating shaft, and at the other end, it similarly extends for a predetermined length in the radial direction of the shaft. The released annular sliding plates 20 are integrally attached to the rotating shaft 18 so as to slide against and sandwich both ends of the bearing box 16, so that the rotating shaft 18 can be rotated without being displaced laterally. It is becoming possible to do so.

Further, the support plate 19 is provided with a pin hole 21 communicating with the bearing box 16, and by inserting a rotation locking pin 22 into the pin hole 21, the rotation of the rotating shaft 18 can be stopped. There is. Further, a brake screw 23 is integrally attached to the bearing box 16 so as to face the support plate 19 and to be freely retractable, so that the rotational speed of the rotating shaft 18 can be controlled.

Further, as shown in FIG. 5, a pair of guide rods 24 are attached to the support plate 19, extending forward from the support plate 19 and having their tips separated by a predetermined gap. The center position in the longitudinal direction can be determined.

The segment gripping means 13 is attached to the rotating means 14 configured as described above.

This gripping means 13 includes a gripping arm 25 for gripping the divided segment 7, an arm opening/closing bolt 26 connected to this arm 25 to open and close it, and an arm opening/closing handle 27 for mainly axially feeding this bolt 26. It is mainly composed of.

The gripping arm 25 is formed of a pair of arms enlarged in a fan shape facing the segment side, and is formed to be enlarged sequentially in the vertical direction toward the divided segment side, and its base end side is connected to the support plate. It is pivotally supported via pins to brackets 28, 28 fixedly attached to 19 so as to be freely swingable. The distal ends 19, 19 of the arms 25 are bent inwardly to fit into the arc-shaped engagement groove 30 formed in the split segment 7, and are bent in a circular direction along the longitudinal direction of the engagement groove 30. It is formed in an arc shape.

On the other hand, the arm opening/closing bolt 26 is provided along the axis of the cylindrical rotating shaft 18 of the rotating means 14 so as to pass through it. The base ends of the respective arms 25 are connected to the distal ends 31 of the bolts 26 via link members 32, and by threading the bolts 26 in the horizontal direction, the respective arms 25 The space between the tip portions 29 and 29 of the tube can be expanded or contracted.

Further, a thread is formed at the base end of the bolt 26, and the threaded portion 33 is connected to the rotating shaft 1.
The nut portion 27a of the arm opening/closing handle 27 is rotatably supported by the support member 34 at 8.
are screwed together, and by rotating this handle 27, the bolt 26 can be twisted and fed in the horizontal direction.

Furthermore, a nut portion 35a of a locking handle 35 is threaded onto this bolt 26 as a so-called double nut in series with the arm opening/closing handle 27.
It is now possible to lock the

Segment gripping means 1 configured as above
3, when gripping the divided segment, the gripping means 13 is moved such that the center of gravity G of the segment is located on the extension line of the wire rope 12.
The size of is set.

In the figure, 36 is a rib for increasing the strength of the frame 15, and 37 is a counterweight for stabilizing the entire device.

Next, the operation of the present invention will be described.

First, as shown in FIG. 1, the roller tires 3 are rolled out to the outside of the rotary table 2 and maintained in a horizontal state.

Next, a crane (not shown) is operated toward this roller tire 3 maintained in a horizontal state, and the segment exchange device 11 is brought close to it. At this time, the crane is operated so that the divided segment to be exchanged or halved is located at the position of the gripping arm 25 of the segment gripping means 13. Note that the target divided segments may be positioned at predetermined locations by rotating the roller tires 3.

Next, as shown in FIG.
By rotating the locking handle 35 screwed onto the arm opening/closing bolt 26 of No. 3, the nut portion 35a is moved back sufficiently to release the lock.

Next, by rotating the unlocked arm opening/closing handle 27, this nut portion 27a is opened.
The arm opening/closing bolt 26 screwed into the arm opening/closing bolt 26 is axially moved toward the divided segment side. As a result, the base ends of the arms 25 attached via the link members 32 are pushed forward, and the distal ends 29 of the arms are expanded in the vertical direction so as to be separated from each other with the brackets 32 as rotational axes. . Needless to say, the distance between the distal ends 29 of the arms is greater than the thickness of the divided segments 7.

Then, in this state, the crane is further advanced to position the divided segment 7 within the vertically expanded arm 25. Of course, the exchange device may be moved to the vicinity of the divided segment 7 with the arm 25 expanded in advance. When positioning this split segment 7 at a predetermined location, the tips of a pair of guide rods 24 that are provided to expand forward from the support plate 19 are located at both ends of the split segment 7 in the longitudinal direction. As a result, it is possible to center the divided segments 7 (see FIG. 5).

Next, the arm opening/closing handle 27 of the segment gripping means 13 is rotated in the opposite direction to that described above.
Screw the arm opening/closing bolt 26 backward. As a result, the expanded arm 25 rotates around the bracket 28 so as to narrow the distance between its distal ends 29, and finally the distal ends 29 of the arms 25 are securely inserted into the engagement grooves 30 of the split segments 7. It is inserted into and grasped. At this time, the center of gravity G of the segment 7 is located approximately on the extension line of the wire rope 12 to prevent the generation of rotational moment.

In this way, after gripping the divided segment 7, rotate the locking handle 35 and attach the locking handle 3 to the nut portion 27a of the arm opening/closing handle 27.
5 is tightened and fixed, and the arm opening/closing handle 27 is locked to the arm opening/closing bolt 26.

After the divided segment 7 is securely gripped in this manner, the bolt 8 fixing the divided segment 7 is removed to disconnect the rotating body 6 and the divided segment 7.

Then, in this state, operate a crane or the like to pull the entire device away from the roller tires 3 in the horizontal direction.
Separate the divided segment 7. At this time, since the center of gravity G of the divided segment 7 is located on the extension line of the wire rope 12, no rotational moment is generated and the entire device remains stably stationary.

In this way, once the segment segment 7 is separated from the roller tire 3, a temporary storage stand 38 is placed at the bottom of the segment segment 7.
to stabilize it. Next, the rotation locking pin 22 connecting and fixing the support plate 21 of the rotation means 14 and the bearing box 16 is removed to free the rotation shaft 18. In this state, arm opening/closing bolt 2
By gradually rotating the arm opening/closing handle 27 locked at 6, the rotating shaft 18 is rotated 180 degrees or half a turn via the radial bearing 17, and the worn surface 39 and unworn surface 40 of the segment 7 are turned upside down. let In the illustrated example, the lower part of the initially divided segment 7 is the unworn surface 40, and the upper part is the worn surface 3.
It has become 9.

At this time, the tip end 29 of the arm 25 is fitted into the arc-shaped engagement groove 30 of the divided segment 7 and is securely gripped, so that it does not slip and fall, and the segment 7 Guide rods 24 located at both ends of the segment 7 hold the segment 7 in place to prevent it from sliding down.

In addition, a brake bolt 23 provided in the bearing box 16
is pressed against the support plate 19 with an appropriate pressure, so even if the rotation locking pin 22 is removed, the rotating shaft 18 does not rotate suddenly, and the rotational speed can be controlled.

Furthermore, since both ends of the bearing box 16 are held between the support plate 19 and the sliding plate 20, the rotating shaft 18 will not shift laterally or come off.

In this embodiment, the arm opening/closing handle 27 is also used as a handle for reversing the divided segments, but a separate reversing handle may be attached integrally with the rotating shaft 18.

After the divided segments 7 are turned upside down in this way, the whole device is brought closer to the roller tire 3 by operating a crane or the like again, and the divided segments 7 are fitted into the original position on the rotating body 6. , and tighten and fix this with bolts 8 (see Fig. 5).

Next, the locking handle 35 is rotated in the opposite direction to unlock the arm opening/closing handle 27, making it free.

Then, by rotating the arm opening/closing handle 27, the arm opening/closing bolt 26 is axially sent to the roller tire 3 side again, the gripping arm 25 is expanded, and the engagement between the gripping arm 25 and the divided segment 7 is severed. .

Once the reversal of the first divided block 7 is completed in the above manner, the same operation is performed by appropriately rotating the roller tire 3 or by appropriately moving the device in the circumferential direction of the roller tire. to flip the next segment.

By continuously performing this operation, all the divided segments can be reversed, and the worn surface 39 and the unworn surface 40 can be turned upside down.

In this way, the divided segment 7 is gripped by the segment gripping means 13 and then turned over and reattached to the original position, so that the reversing operation can be carried out by lifting the divided segment itself as in the conventional method. The work can be done quickly and easily, and the work time can be significantly shortened compared to when the machine is in use.

In the above embodiment, the operation of reversing the divided segments has been described, but it goes without saying that this device can also be used when replacing a worn segment with a new, unworn segment.

Furthermore, the gripping arm is not limited to that of the above embodiment, but for example, as shown in FIG. The gripping arm may also be designed to be flexible.

[Effect of idea]

In summary, according to the present invention, the following excellent effects can be achieved.

(1) The work of reversing divided segments can be performed quickly and easily.

(2) Since the divided segments can be reliably gripped by mechanical means, they will not fall and work safety can be improved as much as possible.

(3) The operation rate of the roller mill can be improved because the reversal or replacement work can be carried out in a short time.

[Brief explanation of drawings]

Figure 1 is a schematic vertical cross-sectional view showing a vertical roller mill;
Fig. 2 is a perspective view showing a roller tire, Fig. 3 is a partially cutaway side view showing a preferred embodiment of the present invention, and Fig. 4 is a perspective view showing a roller tire.
The drawings are a view taken along the line in FIG. 3, FIG. 5 is an enlarged view taken in the direction taken from the line in FIG. 3, and FIG. 6 is a plan view showing a modified example of the gripping arm. In the figure, 2 is a rotary table, 3 is a roller tire, 7 is a divided segment, 13 is a segment gripping means, 14 is a rotation means, 25 is a gripping arm, and 38
40 is a worn surface, and 40 is an unworn surface.

Claims (1)

[Claims for Utility Model Registration] 1. A roller tire of a roller mill, which is tilted and rotatably supported on a rotary table and consists of arc-shaped segments divided along the circumferential direction, is moved approximately horizontally to the outside of the rotary table. In a device for exchanging parts by unfolding and moving each divided segment so that the unworn surface is in contact with the rotary table,
a segment gripping means movably supported facing the roller tire developed and moved to the outside of the rotary table, the segment gripping means gripping and detaching the divided segment from the roller tire;
A split segment exchanging device for a roller tire of a roller mill, characterized in that it is equipped with a rotation means for rotating the split segment in a gripped state. 2. The gripping means is provided integrally with the rotation means, and includes a pair of gripping arms for gripping the divided segments by opening and closing them so as to approach and separate them from at least both sides thereof, and a pair of gripping arms connected to the arms to grip the divided segments. The dividing segment changing device for a roller tire of a roller mill according to claim 1, which comprises an arm opening/closing bolt for opening and closing, and an arm opening/closing handle for axially feeding the arm opening/closing bolt. 3. A state in which the rotating means includes a frame suspended from a crane or the like, a rotating shaft supported by the frame as horizontally as possible parallel to the expanded segment, and a state in which the rotating shaft is reversed by 180 degrees. A dividing segment changing device for a roller tire of a roller mill as set forth in claims 1 and 2 of the above-mentioned utility model registration claim, comprising a stopping means for stopping the roller tire at a stop point. 4. The scope of the utility model registration claim, wherein the rotating shaft is formed of a cylindrical body, the gripping arm is attached to the end of the rotating shaft, and the arm opening/closing bolt is provided inside the cylindrical body along its axial direction. 3. A dividing segment changing device for a roller tire of a roller mill according to items 2 and 3.