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Where D is the bottom diameter (m) of the crush cone.
Where K 1 - the severability coefficient of the ore (Table 1); K 2 - the correction factor of the crushing ratio (Table 2); e - the width of the discharge opening mm; δ - the loose density of the ore (t /m 3 );q 0 ——the production capacity per unit discharge opening width (t/mm•h) (Table 3).
1. Feeding port and discharge port width The width of the feed port of the cone crusher is B = (1.2 ~ 1.25) D, where D is the feed size, which is determined by the beneficiation process.
The width of the discharge opening depends on the required product size. Since the cone crusher has a check sieve, its discharge opening width is equal to the required product size. The width of the discharge opening of the medium crushing cone crusher is e=dmax/Z, where dmax is the maximum particle size of the product; Z is the excessive particle coefficient of the discharge, Z=2.4 when crushing the hard ore; Z=1.9 in the hard ore Soft ore Z = 1.6.
2. When the angle is in the actual design calculation, the angle of the cone crusher is usually selected between 21 ° and 23 °.
3. The length of the parallel belt is to ensure the required fineness and uniformity of the crushed product of the crusher. A parallel crushing belt is arranged in the lower part of the crushing chamber of the cone crusher, so that the ore should be inspected at least once in the parallel belt. Sexual breakdown. The parallel strip length L is related to the type and size of the crusher. For the crusher cone crusher L=0.16D; for the medium crusher cone crusher L=0.085D. Where D is the largest diameter of the lower part of the movable cone.
4. The rotational speed of the eccentric bushing in the actual design, using the following general empirical formula to determine the rotational speed of the eccentric bushing n, which is the calculation result is very close to the actual situation, i.e., 5. Productivity The productivity of the cone crusher is related to many factors such as the nature of the ore, the shape of the crushing chamber, the type of crusher, the specifications, and the operating conditions. It is also related to the configuration of the crusher in the beneficiation process. At present, there is no theoretical calculation method that can fully reflect these factors, and generally the following empirical formula is used for calculation.
(1) The productivity of the cone crusher when the open circuit is broken.
Q=K 1 K 2 q 0 eδ/1.6(t/h)
Table 1 Ore Fragility Coefficient K 1
Ore hardness
Compressive strength / Pa
Platt hardness coefficient
K 1
hard
Medium hard
soft
1.6~2
0.8~1.6
<0.8
16~20
8~16
<8
0.9~0.95
1.0
1.1~1.2
Table 2 broken and fine crusher crusher crush ratio correction factor K 2 *
Standard or medium cone crusher
Short cone crusher
e/B
K 2
e/B
K 2
0.6
0.55
0.4
0.35
0.9~0.98
0.92~1.0
0.96~1.06
1.0~1.1
0.4
0.25
0.15
0.075
0.90~0.94
1.0~1.05
1.06~1.12
1.14~1.2
Remarks: *1.e - refers to the width of the discharge opening of the upper crusher; B - the width of the feed opening of the crusher or fine crusher in this section, but when the closed circuit is broken, it refers to the discharge opening of the closed crusher The ratio of the width to the width of the feed opening; 2. The small value is set when the pre-screening is provided, and the large value is taken when the pre-screening is not set.
Table 3: When the open circuit is broken, the spring cone crusher q 0 value*
specification
q 0
Standard and medium
Short head
600
900
1200
1750
2200
1.0
2.5
4.0~4.5
8.0~9.0
14.0~15.0
4.0
6.5
14.0
twenty four
* When the discharge port takes a large value, the discharge port takes a small value when it is large.
(2) The productivity of the cone crusher when closed circuit is broken.
Q b =KQ(t/h)
In the formula, Q——the productivity of the cone crusher when the open circuit is broken (t/h); K——the average feed size variation coefficient of the closed circuit, and the medium or short head cone crusher generally takes K=1.15~1.4, ore Take a small value when it is hard, and take a large value if it is the opposite.
Normally standard and intermediate cone crushers are calculated according to the open circuit process; short head cone crushers can calculate their productivity either in the open or closed process.
6. The motor power of the motor power cone crusher can be calculated according to the following empirical formula: P = 65 D 1.9 (kW), where D is the bottom diameter (m) of the crush cone of the cone crusher.