JPH0337714Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotary crusher used for crushing rocks, ores, etc.

(Prior Art) Conventionally, as seen in, for example, Japanese Utility Model Application Publication No. 59-180738, a head center having a tapered outer surface has been provided on the outer periphery of a rotating main shaft. A flat cylindrical mantle is tapered and removably fitted, and in order to press and fix the mantle to the head center, a head nut that is screwed into the rotating main shaft and presses the upper end surface of the mantle is inseparable from the mantle. There is a jointed rotary type crusher.

The mantle of the above-mentioned rotary crusher is a wear part, so it needs to be replaced at regular intervals. In that case, to remove the mantle from the head center,
It is necessary to remove the head nut from the rotating spindle.
However, the joint between the head nut and the mantle is made indivisible to prevent separation during crushing operations. Therefore, in order to remove the head nut, the first idea is to melt it down, but
There is a risk of damaging the thread of the rotating spindle.
Therefore, conventionally, the head nut and the mantle were separated by cutting the mantle in the circumferential direction, the head nut was screwed off from the rotating main shaft, and then the mantle was removed from the head center and replaced.

(Problems to be solved by the invention) Since the mantle is required to have great hardness, it is usually made of high manganese cast steel, but high manganese cast steel is difficult to melt. Further, the upper end of the mantle is cut by fusing so that the head nut can be easily unscrewed, but since the upper end of the mantle is the upper end of the crushing chamber, there is little wear and the wall thickness is large, so it is difficult to be cut by fusing. Therefore, replacing the mantle required a great deal of effort and time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary crusher that can solve the above problems by melting the mantle in a short time without reducing its strength.

(Means for Solving the Problems) The present invention is characterized by the technical measures taken to solve the problems of the prior art. A head center 13 is provided, and a cylindrical mantle 14 whose outer surface is a crushing surface is taper-fitted to the outer surface of the head center 13 in a removable manner. The head nut 16 that is screwed into the mantle 14 and presses the upper end surface of the mantle 14 is a rotary crusher that is inseparably joined to the mantle 14.
In order to be able to remove the head from the head center 13 and replace it, the mantle 14 is melted in the circumferential direction so that the head nut 16 is separated from the mantle 14 and can be screwed off from the rotating main shaft 11. This is because fusing recesses 19 are arranged in a row at intervals in the circumferential direction on the inner circumferential surface of the upper end side of the mantle 14.

(Function) By providing the recess 19, the wall thickness of the fusing portion becomes thinner, and the fusing time is shortened.

If the recess 19 is provided on the outer circumferential surface of the mantle 14, there is a risk that rocks or the like may get caught therein, causing rapid wear, but since the recess 19 is provided on the inner circumferential surface, there is no such risk.

Since the recesses 19 are arranged in rows at intervals in the circumferential direction, they have better strength against collisions with rocks, etc. during crushing, and are more resistant to the impact of the mantle due to the load during crushing, compared to those in the form of circumferential grooves with no intervals. The deformation resistance against elongation deformation is also high.

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

In the rotary crusher 1 shown in FIG. 1, a cylindrical body 2 is formed by joining two upper and lower members in a separable manner.

3 is a charging hopper connected to the upper end of the body 2.

4 is an annular cone cape joined to the inner surface of the body 2, and the inner circumferential surface is a crushing surface.

Reference numeral 5 denotes a fixed cylinder located at the center of the fuselage 2, which is connected and fixed to the inner surface of the fuselage 2.

Reference numeral 6 denotes a drive cylinder, which is rotatably fitted into the fixed cylinder 5. A driven bevel gear 7 is provided at the lower end of the drive cylinder 6.
is fixed externally.

A drive shaft 8 is rotatably supported by the body 2, and a drive bevel gear 9 is attached to the tip and meshes with the driven bevel gear 7, which rotates the drive cylinder 6 by being rotationally driven by a drive source (not shown). let

Reference numeral 10 denotes an upper bearing, which is located at the center of the upper end of the body 2 and is connected and fixed to the inner surface of the body 2.

Reference numeral 11 denotes a swing main shaft, the lower end of which is rotatably fitted into the drive cylinder 6, the upper end of which is rotatably fitted into the upper bearing 10, and the lower end surface of which is a hydraulic device that moves the swing main shaft 11 up and down via the bearing. It is supported by 12. Here, the axis O of the upper bearing 10 is aligned with the center of the body 2, but the hole center O' of the drive cylinder 6 is eccentric. As a result, the center of the rotating main shaft 11 is also
Since it is eccentric from the center, the rotational drive of the drive cylinder 6 causes the swinging main shaft 11 to perform a swinging motion that revolves around the center of the fuselage.

Reference numeral 13 denotes a head center whose outer surface is tapered, and is fixedly fitted to the outer periphery of the midway portion of the rotating main shaft 11 in a tapered manner.

14 is a cylindrical mantle whose outer surface is a fractured surface,
It is tapered and removably fitted to the outer surface of the head center 13. A crushing chamber 15 is located between the crushing surface on the outside of the mantle 14 and the crushing surface on the inside of the cone cave 4.
Here, the rocks, ores, etc. introduced from the hopper 3 are compressed and crushed between the crushing surfaces by the rotation of the rotating main shaft 11.

Reference numeral 16 denotes a head nut, which is screwed into the rotating main shaft 11 through a male screw portion 17 formed in the middle thereof, and presses the upper end surface of the mantle 14 to close the mantle 14.
is pressed and fixed to the head center 13. Then, during the crushing operation, the head nut 16 and the mantle 1
A pin 18 that engages with both 14 and 16 is inserted into the joint so that the joint with 4 is not separated,
The pin 18 is welded to both 14 and 16 to prevent it from coming off. As a result, the head nut 16
does not rotate due to the frictional force caused by the tapered fit between the mantle 14 and the head center 13,
It is said to be indivisible from Mantle 14.

In the above-mentioned rotary type crusher 1, when the mantle 14 is replaced due to wear of the crushing surface, etc., the body 2
After removing the upper member, the upper end of the mantle 14 is cut in the circumferential direction to separate the head nut 16 and the mantle 14, and the head nut 16, which is now rotatable, is screwed off from the rotating main shaft 11 and separated from the mantle 14. Release the pressing fixation with the head center 13, and then move the mantle 14 to the head center 13.
Remove the mantle and install the new mantle and head nut. At this time, on the inner circumferential surface of the upper end side of the mantle 14, which is the melted portion, as shown in FIG. 2, recesses 19 are arranged in a row at intervals in the circumferential direction.
As a result, the wall thickness of the fusing portion of the mantle 14 becomes thinner, the fusing time is shortened, and the time and labor required for replacing the mantle 14 can be reduced. Moreover, since the recess 19 is located on the inner circumferential surface of the mantle 14, rocks will not get caught therein, and the wear of the mantle 14 will not be accelerated. Further, since the recesses 19 are arranged in a row at intervals in the circumferential direction, the recesses 19 have superior strength against collisions with rocks, etc. during crushing, compared to those in which the recesses 19 are arranged in a circumferential groove shape without any intervals. Furthermore, since the mantle 14 tends to undergo elongation and deformation due to the load during crushing, the deformation resistance can be made greater than when the recess 19 is formed into a circumferential groove shape.

(Effect of the invention) According to the invention, when cutting the mantle in the circumferential direction to separate it from the head nut, recesses are arranged in a row at intervals in the circumferential direction on the inner peripheral surface of the cutting part. In addition, the fusing time can be shortened, reducing the time and labor required to replace the mantle. Moreover, since the recesses are located on the inner circumferential surface, they do not get caught by rocks, etc., so they do not affect the progress of mantle wear, and because they are provided at intervals, compared to those with circumferential grooves. It has excellent strength.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotary type crusher according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the mantle. 1... Rotating crusher, 11... Rotating main shaft, 13
...Head center, 14...Mantle, 16...
Head, 19... recess.

Claims (1)

[Scope of utility model registration request] A head center 13 having a tapered outer surface is provided on the outer periphery of the rotating main shaft 11, and a cylindrical mantle 14 having a crushing surface is removably tapered fitted to the outer surface of the head center 13. 1
4 to the head center 13, the head nut 16 is screwed into the rotating main shaft 11 and presses the upper end surface of the mantle 14. In order to make it possible to remove the head nut 14 from the head center 13 and replace it, the mantle 14 is melted in the circumferential direction so that the head nut 16 is separated from the mantle 14 and can be screwed off from the drive shaft 11. A rotating crusher characterized in that fusing recesses 19 are arranged in a row at intervals in the circumferential direction on the inner peripheral surface of the upper end side.