JPH04100551A - Impact type grinder - Google Patents

Abstract

PURPOSE:To enhance the abrasion life of a rotor while well securing grinding capacity by setting the interval between the outer wall of the rotor and the collision part provided around the rotor to a proper dimension region and setting the peripheral speed of the rotor to specific speed. CONSTITUTION:The interval L between the outer peripheral surface 43 of the rotary rotor 41 constituting an impact type grinder 30 and an anvil 42 being one embodiment of a collision part is set to 250-350mm and the peripheral speed of the rotary rotor 41 is set to 50-70m/sec. As a result, the abrasion of the outer wall of the rotor is suppressed while grinding capacity is well secured to make it possible to extend the abrasion life of the rotor.

Description

[Detailed description of the invention]

[0001]

[Industrial application field]

The present invention relates to an impact crusher, particularly for crushing rocks, for example.
The present invention relates to an impact type crusher useful for crushing or sizing (cutting corners) raw raw material such as ore to a desired particle size for making sand. [0002]

[Background of the invention]

Conventionally, this type of impact crusher as shown in FIGS. 6 to 8 has been known. Such an impact type crusher is disclosed in Japanese Patent Publication No. 53-33785. That is, in FIG. 8, a rotor 1 (see FIG. 6) mounted on a vertical shaft via a bearing 2 (see FIG. 6) has a rotating central distributor 20 installed at the center of the rotor 1. Center-swivel wings 21, 22 and 25 are arranged,
For example, a tip wing 24 having a carbide tip 24a attached thereto is integrally fixed to the tip of the wing 25. [0003] Therefore, the raw material ore (hereinafter referred to as raw material) fed from the raw material supply device 11 shown in FIG.
and 25, from the tip blade 24 to the outlet 19 (see FIG. 7), from where it is discharged to the outside of the rotor. As shown in FIG. 6, the discharged raw material is dead stock 15 (or a ring liner 16 arranged) formed as a collision part inside the housing 8 housing the rotor 1.
(double-dashed line)). In such an impact type crusher, dead stock 15
The type that is provided with a ring liner 16 and causes the raw material to collide with this dead stock 15 is for sizing (grain shape correction) of the raw material, and the type that is provided with a ring liner 16 and causes the raw material to collide with this ring liner 16 is for raw material particle size adjustment. It is for crushing. [0004] By the way, in such a conventional impact type crusher, when the rotor 1 is rotating at a relatively high speed, a part of the raw material that collides with the dead stock 15 or the ring liner 16 is affected by the strength of the impact. will be bounced back. At this time, if the distance between the rotor outer wall 18 (see FIG. 6) and the dead stock 15 or ring liner 16 is narrow, the rotor outer wall 18 will be subjected to this rebound violently and will be worn out by the rebounding raw material. On the other hand, if the distance between the rotor outer wall 18 and the dead stock 15 or the ring liner 16 is too wide, wear of the rotor outer wall 18 can be prevented, but there will be a problem in terms of crushing energy and the crushing performance will deteriorate. do. Therefore, in view of the degree of wear of the rotor outer wall 18 due to the bouncing of raw material and the crushing performance, it is necessary to set the distance between the rotor outer wall and the collision surface provided around the rotor to an appropriate width. Therefore, the main object of the present invention is to provide an impact crusher that ensures good crushing performance and extends the wear life of the rotor. [0005]

[Means to solve the problem]

In order to achieve the above object, the main means adopted by the present invention is to discharge the material to be crushed, which has been put into a rotor rotating at high speed, from the outlet of the rotor by centrifugal force. In an impact crusher that crushes the material by colliding with a collision part provided around it, the distance between the outer peripheral surface of the rotor and the collision part is 250 mm to 350 m.
m, and the circumferential speed of the rotor is set to 50 m.
This is an impact type crusher that is set between 70 m/sec and 70 m/sec. [0006]

【Example】

FIG. 1 is a schematic side sectional view showing an impact crusher according to an embodiment of the present invention. FIG. 2 is an equivalent view of FIG. 1 showing a modification of the embodiment shown in FIG. 1. FIG. Amount of wear on the outer wall,
Wear characteristics diagram of rotor outer wall with operating time plotted on the horizontal axis Figure 9
Figure 1 shows the particle size distribution characteristics of raw materials and crushed products, with the vertical axis representing the passing percentage and the horizontal axis representing the particle size. Figure 5 shows the relationship between the amount of crushing and power consumption, with the vertical axis representing the power consumption and the amount of crushing representing the horizontal axis. FIG. In addition, the following example is only one specific example of this invention, and the technical scope of this invention is not limited by this example. In FIG. 1, an impact crusher 30 includes a crushing chamber 31 formed by a housing 34 placed on a pedestal 35 and a lid 33 of the housing 34. At approximately the center of the lid 33, as shown by arrow C, a raw material supply section 32 for supplying all raw materials to the crushing chamber 31 from above is provided, and a hopper 36 is attached to this raw material supply section 32. . Further, the pedestal 35 is formed with a discharge port 37 for dropping the raw material crushed in the crushing chamber 31 downward as shown by the arrow. [0007] A rotor shaft 39 that is vertically and rotatably supported by a bearing box 38 fixed to the upper surface of the pedestal 35 is disposed approximately in the center of the crushing chamber 31. This rotor shaft 3
9 is inserted into the frame 35, and a V-pulley 40 driven by a drive device (not shown) disposed at a predetermined location is attached to the inserted lower end 39b. On the other hand, the upper end 39a of the rotor shaft 39 located approximately in the center of the crushing chamber 31 has a
A hollow cylindrical rotating rotor 41 is attached which rotates approximately horizontally with the center of rotation at . In this case, the two-rotation rotor 41 functions almost the same as the rotor 1 described in FIGS. 6 to 8, and
The raw material put into the rotating rotor 41 is discharged from the rotating rotor 41 to the outside by centrifugal force. An anvil 42, which is an example of a part that collides with the raw material, is arranged around the rotating rotor 41 at a height opposite to the raw material discharge port 47 provided on the rotary rotor 41. [0008] The diameter of the one-rotation rotor 41 is such that a space as described below is provided between the rotor outer wall 43 of the rotor 41 and the anvil 42 disposed opposite to the rotor outer wall 43. is set to At this time, as a characteristic component of the apparatus of this embodiment, when the circumferential speed of the rotor 41 is set to about 70 m/sec, the interval is set to 250 to 35.0 mm. However, setting the circumferential speed of the rotating rotor 41 to approximately 70 m/sec is an optimal implementation requirement for achieving the most excellent effect in setting the spacing conditions, and there may be some deterioration in efficiency. The circumferential speed of the rotating rotor 41 can be appropriately selected within the range of 50 to 70 m1 seconds, for example. [0009]

[Experiment example]

Below, in FIG. 1, an impact crusher 30 in which the circumferential speed of the one-rotation rotor 41 and the distance between the rotor outer wall 43 and the anvil 42 are set within a certain range, for example, the amount of raw material input at the time of measurement is about 40 tons / h, raw material (basalt) particle size 10-20m
An experimental example in which m raw materials were introduced will be described with reference to Table 1.2 and FIGS. 3 to 5 below. [0010]

[Table 1]

[0011] In the first experimental example, the circumferential speed of the 9-turn rotor 41 was set to 70 m/sec, for example. As shown in Table 1, the above-mentioned spacing was set in seven ways (samples (3) to (20)) in the dimension range of 75 to 400 mm, and the spacing between the rotor outer wall 43 and anvil 42 shown in FIG. The particle size of crushed products was investigated with respect to changes in . In other words, as can be seen from Table 1, each sample (3) ~
Among (20), there is almost no change in crushing performance when the spacing size is 75 to 315 mm (samples (3) to (13)).1 For example, when the product particle size is 5 mm or less and 2.5 mm.
As seen below, while it has extremely good crushing performance,
This crushing performance gradually decreased in samples (17) and (20), and sample (20) (distance L: 400 mm)
However, the crushing performance was far below the allowable limit. [0012] Next, in the second experiment, Table 1 is as shown in Figure 3.
Using samples (3) to (20), the wear amount of the rotor outer wall 43 with respect to the rotor operating time t was measured. In addition, in order to make the characteristics more noticeable, following the measured values of actual samples (3) to (20) shown in each solid line, the wear amounts estimated based on these specific data are shown in chain double-dashed lines. Ta. In other words, as you can see from Figure 3, the dimension of 9 intervals is 75
It was found that the amount of wear on the rotor outer wall 43 shown in FIG. 2 changes significantly in the case of ~400 mm (samples (3) to (20)). On the other hand, the permissible range for the amount of wear on the rotor outer wall 43 is usually within about 1 mm per 20 hours of operation. chosen as the lower limit. [0013] It has been found that the initial objective can be achieved by setting the distance between the rotor outer wall 43 and anvil 42 shown in FIG. 1 to 250 to 350 mm. Incidentally, FIG. 2 shows a modification of the embodiment device according to the present invention. In the impact type crusher 30' shown in FIG. 2, a dead stock 44 made of raw material is provided in place of the anvil 42 of the impact type crusher 30 shown in FIG. Also in this case, the rotor outer wall 4 of this dead stock 44
By setting the distance L' between the position P facing No. 3 and the rotor outer wall 43 to be 250 to 350 mm. It goes without saying that the same effects as shown in the embodiment shown in FIG. 1 can be achieved. Furthermore, in the third experimental example, the above-mentioned interval was set to 315 mm obtained in the first experimental example, the raw material input amount at the time of measurement was approximately 30 t/h, and the raw material (basalt) particle size was 10 to 25 m.
As shown in Table 1, when m raw materials are input,
The circumferential speed of the rotor was set in four stages from 40 to 70 m/sec, and measurements were taken according to predetermined items, and the results are shown in FIGS. 4 and 5. [0014] FIG. 4 is a graph showing the particle size distribution of raw materials (particle size 10 to 25 mm) and crushed products. When the raw materials indicated by the lower right line are introduced, the rotor circumferential speed set in four stages is 40 to 70 m.
7 seconds, the result is a crushed product as shown in each graph on the upper left. In this case, as each graph shifts toward the upper left, it shows that the crushed monsters become finer, and it can be seen that the higher the one-round speed, the better the crushed monsters are. Therefore, it can be said that it is preferable to set the circumferential speed of the rotor as high as possible. The results are close to 60 to 70 m/sec, and it can be seen that increasing the speed more than necessary is not so effective in terms of effectiveness. For example, in the case of sand-making applications, the target amount (t/h) of crushed products with a grain size of 5 mm or less should be at least 50%. The circumferential speed is 50 m/sec or more. [0015] On the other hand, FIG. 1 is a graph showing the relationship between the amount of crushing and power consumption, and shows that for the same amount of crushing, the more the circumferential speed of the rotor increases, the more power is required. in this case. Comparing the IT/h power of 60 m/sec and 70 m/sec, the power increases rapidly, and in terms of power efficiency, as can be seen from Table 2, the maximum circumferential speed of the rotor is 70 m/sec. . From the above, if we select a range in which we can collect as much product as possible with a particle size of 5 mm or less and the power consumption of the rotor is small, the applicable rotor circumferential speed is 50 to 70 m.
It turns out that /second is good. [0016]

【Effect of the invention】

Since the impact type crusher according to the present invention is configured as described above, the distance between the outer wall of the rotor and the collision part around the rotor is set in an appropriate dimension range, so that good crushing performance is ensured and the rotor It is possible to suppress wear on the outer wall and extend the wear life of the rotor.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view showing an impact crusher according to an embodiment of the invention.

2 is a diagram corresponding to FIG. 1 showing a modification of the embodiment device shown in FIG. 1;

[Fig. 3] A wear characteristic diagram of the rotor outer wall, with the amount of wear on the rotor outer wall plotted on the vertical axis and the operating time plotted on the horizontal axis.

FIG. 4 is a particle size distribution characteristic diagram of raw materials and crushed products, with passage percentage on the vertical axis and particle size on the horizontal axis.

FIG. 5 is a characteristic diagram showing the relationship between the crushing amount and the power consumption, with the vertical axis representing the power consumption and the horizontal axis representing the crushing amount.

FIG. 6 is a schematic side sectional view showing a conventional impact crusher.

FIG. 7 is an overall perspective view of the rotor in FIG. 6.

8 is a plan view showing the internal structure of the rotor shown in FIG. 7. FIG.

[Explanation of symbols]

30.30'...Impact crusher 41...Rotating rotor 42...Anvil 43...
・Rotor outer wall 44...dead stock L
, L'...interval

[Document base]

drawing

[Figure 1]

[Figure 21 C [Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7] [Figure 81

Claims (2)

[Claims] 1. An impact type crusher in which a material to be crushed is thrown into a rotor rotating at high speed, and is discharged from an outlet of the rotor by centrifugal force, and is crushed by colliding with a collision part provided around the rotor, comprising: The distance between the outer peripheral surface of the rotor and the collision part is 250 m.
m to 350 mm, and the peripheral speed of the rotor is set to between 50 m/sec and 70 m/sec. 2. The impact crusher according to claim 1, wherein the outlet of the rotor is opened near the outer peripheral surface of the rotor.