SU943163A1 - Method of adjusting and monitoring the parameters of friction-type mine hoist - Google Patents

Description

(5) METHOD OF ADJUSTMENT AND CONTROL OF PARAMETERS OF FRICTIONAL MINE HOISTING INSTALLATION

FIELD OF THE INVENTION The invention relates to hoisting transport machinery and relates to a method for adjusting and controlling parameters of a friction mine hoisting installation. The method of setting up and monitoring the parameters of the friction mine lifting installation is known, which consists in accelerating the installation and determining the calculated and actual decelerations by oscillographing the parameters of the safety braking of the installation with the calculated load, checking the non-slip of the ropes along the lead pulley, regulate the braking forces of the safety brakes and tighten the vessels to the required values by the condition of non-slip rope tl. The disadvantage of this method lies in the low margin of non-slip of the ropes in the event of safety braking of the installation with an overloaded vessel. The purpose of the invention is to provide a reserve for non-slip of the ropes in the event of a safety braking of the lowered overloaded vessel. To achieve this goal, acceleration is carried out in the free run mode with registration of the motion parameters of the installation on the oscilloscope film, the actual value of the reduced weight of the rotating parts of the machine is determined by the formula S-S p G.ST P.ST fc with mash S G V-st pst then the obtained value of Pc (.ts | with the calculated Rmash. determined by the condition of non-slip of the ropes when the lifting vessel is overloaded. (t -1) PMCIIU F, Ghodin

 dttj RMOSH - the actual and permissible weight of 5 rotating parts of the lifting machine, kN, respectively, reduced to the radius of the traction sheave;

Sr.CT S

Respectively, stapling tension of the loaded and empty branches of ropes, kN;

but

- system acceleration

C6 with free run,

F-r - reduced to the radius

pulley brake force of safety brake, kN;

yu- is the coefficient of friction between the ropes and the lining of the driving pulley;

cjL - angle of coverage of the pulley with ropes, glad; regulatory dynamic safety factor against slipping of the head ropes; i 2.71 - the basis of natural logarithms;

g 9.81 - acceleration of free fall of the body, m / s, followed by installation installation.

The essence of the method is as follows.

Overloading the lifting vessel leads to a decrease in both the calculated and actual decelerations of the lifting installation during safety braking, and with a certain ratio of installation parameters, a condition may arise in which the values of the actual decelerations will always be less than the calculated ones. The required ratio of installation parameters is due to the fact that the graphs do not intersect actual and allowable installation slowdowns or the non-slip values of the safety factor for rope slip in the event of an overload of the lifting vessel. In the first case, you need to find the difference

produced from the above dependencies; in the second, to find the marginal values of the safety coefficient. Ultimately, the rope non-slip condition during the safety braking of the lift installation in the descent mode of the overloaded vessel will be written in the form of equality (1).

The actual value of the weight of the lifting machine should not exceed the calculated values. The value of the reduced weight should be determined by the formula (1), having previously determined the acceleration of free coasting of the system (approximate values of the reduced weights of the elements of the lifting installation are given in the catalogs of the lifting machines).

If the actual weight of the rotating parts of the machine is exceeded by the estimated value, the installation parameters should be changed, including lifting vessels, increasing the coefficient of friction, the angle of the pulley rope, reducing the braking force of the safety brake and replacing the rotating elements of the lifting machine to the values the value of the weight of the rotating parts of the machine exceeds the actual. Thereafter, the non-slip of the ropes along the drive pulley is checked during the safety braking of the installation with the vessel overloaded.

Thus, a comparison of the experimentally obtained weight of the rotating parts of the machine with its calculated value allows the weight of the machine to be corrected, which provides the necessary anti-slip rope margin when braking the lowered overloaded vessel.

Claims (1)

Invention Formula The method of setting up and monitoring the parameters of the friction mine lifting installation, which consists in accelerating the installation and determining the calculated and actual decelerations by oscillographing the parameters of the safety braking of the installation with the calculated load, checking the non-slip of the ropes on the drive pulley, adjusting the braking forces of the safety brake and adjusting the 5S vessels are desired up to the required values according to the rope non-slip condition, so that, in order to ensure the reserve on the rope non-slip in In the case of safety braking of the overloaded vessel being lowered, acceleration is carried out in the free run mode with registration of the motion parameters of the installation on the oscilloscope band, the actual value of the reduced weight of the rotating parts of the machine is determined using the formula from calculated Pjevclui) by a certain condition of non-slip of the ropes when the lifting vessel is overloaded: () SSDinZ, respectively, where where "w, led to the radius of the leading rider, actual and permissible weight in parts of the machine. kN; - respectively, one hundred static stresses of the loaded and empty branches of ropes, kN; a- “—acceleration of the system during free coasting; F — brake force of the safety braking reduced to the radius of the traction sheave, kN; -friction coefficient between the ropes and the lining of the driving pulley; - angle of the pulley rope coverage, happy; - the standard dynamic safety coefficient against slipping of the head ropes; , 71 bases of natural logarithms; , 8 - acceleration of free fall of the body, m / s, following readjustment. Information, understanding in the examination of the audit, adjustment of auxiliary lifting equipment, 1970, p. 63-67, rototype).