SU647575A1 - Winch testing stand - Google Patents

Description

one

The invention relates to test mechanisms.

A winch test stand is known, containing a portal with test loads connected by ropes with an intermediate drum and with a test winch through a system of blocks.

i. However, the test winch is loaded immediately and with a constant force equal to the weight of the lifted load. This does not allow the use of a winch bench, equipped with an automatic drive mechanism and mounted on, for example, tank tractors. The winders are equipped with a crank-lever deactivation mechanism with a balancing spring and an automatic winch deactivation drive, which must be adjusted so that the tractive effort on the winch rope does not exceed the nominal one. When the force on the rope differs from the nominal one by more than 5%, it is necessary to change the amount of preload; shutdown mechanism.

In order to properly adjust the shutdown mechanism when testing winches, the force on the pull rope must increase gradually, at a rate that allows the operator to fix any force in the range of forces of interest to him.

The purpose of the invention is to ensure a smooth increase of the force on the rope of the hoist winch with a constant weight of the test weight.

For this, in the proposed device, the intermediate drum is made with

5, a cylindrical part connected by a rope with a winch and a cam part connected by a rope with a load, np.i, the working surface of the cam part is made in a spiral of Archimedes.

The drawing shows the proposed stand, a common Id.

The stand consists of a portal 1, in the upper part of which, on axis 2, an intermediate drum is installed with a cylindrical part 3 and a cam part 4. A rope 5 is attached to the cylindrical part 3, which is connected to the test winch at the wheel 6. A rope 7 is attached to the cam part 4 and is associated with the test weight 8.

The stand is equipped with sensors for the angle of rotation of the cam part 4 and a light panel showing the operator an effort on the TiOOBOM winch rope (the sensors and the panel are not shown in the drawing).

To ensure a constant rate of increase of effort on the winch hauling rope, the working surface of part 4

formed by the spiral of Archimedes. Pi5 parts 4 and 3; selected so that the following relationship holds:

to max

Km-in

where K. is the radius of the cylindrical part of the drum}

Gfp is the weight of the test load;

p is the effort on the winch rope at the beginning of the lifting of the load;

RZ maximum effort on the winch rope;

 minimum cam radius;

1 X max is the maximum radius of the cam part.

In the initial position of the stand, the rope 7 carrying the load 8 relates to the working

surface of part 4 at the point of the minimum radius.

When the tested winch is turned on, the rope 5 turns the cylindrical part 3 of the bar along with the cam part 4 lifting the weight 8. At the same time, the force on the winch cable

at the beginning of lifting the load is calculated by the formula;

R,

K.m-in

P-, G, p Btf

Since the profile of the working surface of the cam part is formed by the Archimedes spiral, the increase in force on the winch rope is proportional to the angle of rotation of the drum and cam. The desired rate of growth of the FORCE on the rope for a given movement of its movement is determined by the diameter of the drum.

When the maximum radius of the drum is in a horizontal position, the effort on the winch rope is maximum and equal.

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P-Grp Formula of the Invention

A winch test bench containing a portal with test loads connected by ropes with an intermediate drum and with a test winch through a block system, characterized in that the intermediate drum is made with a cylindrical part connected by a rope with a winch, and a cam part connected by a rope with a load, wherein the working surface of the cam part is made of the Archimedes spiral.

Sources of information taken into account during the examination

1. USSR author's certificate N9 122921, cl. G01 M 15/00, 1958.