MIAB^{©}

ISSN 0236-1493

Mining informational and analytical bulletin

(scientific and technical journal)

It is shown that safety brakes of mine hosting machines, given the idle time t_{х.х} = 0,5 s, and the static reliability factor K_{с.н} = 3, ensure maximum permissible deceleration Aдоп = 5 m/s^{2}, and, thus, minimum deceleration track in neither mine.

Reduction in idle time down to t_{х.х }= 0,1 s, allowed better deceleration from 10.7 to 53% for small hosting machines and improved deceleration by 7% for large hoisting machine depending on the initial velocity prior to deceleration. The deceleration track is decreased by 14.3–23.7% for small machines and by 10.7–12.9 for large machines in this case under the same conditions.

By simultaneous reduction in the idle time to the value of t_{х.х} = 0,1 s, and the increase in the static reliability factor K_{с.н }enables maximum deceleration Aдоп = 5 m/s^{2}. The deceleration track becomes shorter by 29.1–50.1% for small machines and by 21.1–25.8 for large machines depending on the initial velocity. However, the studies have shown that the static reliability factor K_{с.н} first grows to a value of K_{с.н} = 10,5 at the initial velocity V_{нач} = 3,45 m/s, and then lowers down to K_{с.н} = 4,4 as the initial velocity increases to V_{нач} = 11,5 m/s.

For large machines, the static reliability factor Kс.н ranges from K_{с.н} = 4,1 at the velocity V_{нач} = 13,8 , m/s, to K_{с.н} = 3,75 as the initial velocity grows to V_{нач} = 18,4 m/s.

The increase K_{с.н} entails intense wear of brake shoes and, as a consequence, the loss of their life.

Concurrent mechanical and electrical braking action also allows maximum deceleration Aдоп = 5 m/s^{2}. In the capacity of an electric brake, the hoisting motor is used in the mode of dynamic deceleration with separate excitation, the maximum force F*т.д.max = 2 is ensured by including auxiliary resistor rotor in the circuit. The minimum deceleration track for small machines is achieved by setting t_{х.х} = 0,1 s, and the static reliability factor K_{с.н} varies from K_{с.н }= 7,5 to K_{с.н} = 3. For large, machines, t_{х.х} = 0,5 s, is set, and the static reliability factor Kс.н ranges between K_{с.н} = 3,5 and K_{с.н} = 3 , which enables reduction in wear of brake shoes at the increased initial velocity and the extended life cycle.

Reduction in idle time down to t

By simultaneous reduction in the idle time to the value of t

For large machines, the static reliability factor Kс.н ranges from K

The increase K

Concurrent mechanical and electrical braking action also allows maximum deceleration Aдоп = 5 m/s

**Keywords**

Mine hoisting machine, synchronized action mode, dynamic deceleration, life, shell ring, brake shoe.

**Issue number**: 3 **Year**: 2016 **ISBN**: **UDK**: 622.67 **DOI**: **Authors**: Malinovskiy A. K., Shalloev A. P., Sorokina S. A.

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