1. Terms and Definitions
1.1 Standard working conditions of testing
Crushing material stack density of 1.6t/m3, humidity no more than 8%, silica content no more than 2%, compressive strength of 120 MPa ~ 140MPa, limestone without clay.
1.2 Hammerhead wearing rate
The metal wear of the hammer head of a hammer crusher is expressed in g/t for processing each 1 ton material under the specified standard working conditions and crushing ratio.
1.3 Hammerhead wearing grade
The hammerhead wearing grade is a classification method to indicate the hammerhead metal wearing conditions of a hammer crusher. According to this standard, the hammerhead wear is determined and divided into three grades, 1, 2 and 3. Grade 1 indicates the smallest amount of wear, while grade 3 indicates the largest amount of wear.
1.4 Rated grade of hammerhead wearing
When the hammer crusher leaves the factory, the hammerhead wear grade is specified by the hammer crusher manufacturer according to this standard.
1.5 Using rate of material in hammerhead
Under the specified standard working conditions and a certain crushing ratio, the average ratio of the wearable hammerhead material of a hammer crusher.
1.6 Grade of using rate of material in hammerhead
The hammerhead material utilization grade is a classification method to indicate the utilization of hammerhead material of a hammer crusher. According to this standard, hammerhead material utilization is divided into three grades: 1, 2 and 3. Grade 1 indicates the highest utilization rate, while grade 3 indicates the lowest utilization rate.
1.7 Rated grade of using rate of material in hammerhead
When the hammer crusher leaves the factory, the hammerhead material utilization grade is specified by the hammer crusher manufacturer according to this standard.
1.8 Value of reducing of hammerhead wearing
Achieve the material saving and consumption reduction products of maximum hammerhead wear and the minimum hammerhead metal material utilization rate required.
2. Technical requirements
2.1 Hammerhead wearing
Hammerhead wearing should be in accordance with the provisions of following Table.
Hammerhead wearing
2.2 Hammerhead material utilization rate
Hammerhead material utilization rate should be in accordance with the provisions of the following Table
3. Test method
In the formula:
η—hammerhead material utilization rate, %;
Q1—Single mass of new hammerhead in kg;
Q2i—mass of the number of i scrap hammerhead, in kg;
n — the number of hammerheads in a set of hammer crusher.
In the formula:
M — hammerhead wear, in grams per ton (g/t);
Q1 — individual mass of new hammerhead in grams (g);
Q2 — average mass of scrap hammerhead in grams (g)
W — the total mass of material crushed by a pair of hammerheads, in tons (t);
n — the number of hammerheads in one set of hammer crusher.
4. Hammerhead material saving and consumption reduction evaluation value
The hammer crusher products reaching the grade 3 in first and second table are qualified products, if reach grade 2 or above is called material saving and consumption reduction products.
