SU1305572A1 - Bench for testing hinges - Google Patents

Abstract

This invention relates to test benches for hinges, for example, traction chains. The aim of the invention is to improve the reliability of the results by reproducing the operating conditions of the real hinges. This goal is achieved due to the fact that a cam 4 is fixed on the drive shaft 2 with a cam 5, with which the three-arm arm 7 interacts through the rollers 11 and 12 placed on the shoulders 10. The arm 8 of the arm 7 is pivotally connected to the transmission mechanism 9. On the supports 23 the movable element 13 is installed ring 24 and block 22. Between the latter and the mechanism 9 is installed spring 20 compression. The ratio of the parameters of the cam 4 with the cam 5 and the lever 7 is selected from the condition that prevents the mechanism 9 from jamming. 2 Il. / SNX4SV 4 X 4 V4 "Fig.1 C 25 P, W 24 20 J3 S (L s

Description

1. 13

The invention relates to the testing of materials for friction and wear and concerns, in particular, the testing of hinges, for example, traction chains.

The purpose of the invention is to increase the reliability of the results by reproducing the operating conditions of the hinges.

Fig. 1 shows the test bench for the hinges of Figs. 2 - the same, top view.

The stand contains a base 1 with an oscillatory motion drive placed on it, consisting of an electric motor 2 and a gearbox 3 associated with it, on the output shaft of which (not shown) there is a disk cam 4 with a cam 5 on it, mounted on the base of the hinge 6. The stand is equipped with a three-arm lever 7. One of the arms 8 of the three-arm lever 7 is pivotally connected to the transmission mechanism 9, and the other two arms 10 of the three-arm arm 7 are equipped with cylindrical rollers 11 and 12 installed with the possibility of running the copier surface 5 4 .. achkan mechanism 9 is pivotally connected to the rigidly fixed to the movable element 13 of the hinge 14 of the test plug 15, on which are fixed 16 spots zodatchiki.

Loader radial forces of the wall and contains a support 17 and side stops 18 of the fixed element 19 of the test hinge 14, placed on the base 1, and adjustable compression springs 20 installed between the shelves 21 of the fork 15 and the block 22. Deck

The stand works as follows. The rotation of the electric motor 2 is transmitted through the gearbox 3 to the cam with cam 5. When the working area a-b of the working surface of the copier 5 rushes onto the roller 12 of the lever, the latter turns counter-clockwise and rotates the fork 15 through the mechanism 9 around the axis of the test hinge 14, the force required to rotate the test hinge is recorded using strain gauges 16. Together with the rotation of the fork 15, the direction of the radial load changes

ka 22 is installed on supports 23 through

„, T lp shchy effort, always directed its outer rings 24. Supports 23 expand- 4U

laid coaxially with the test hinge 14 and mounted with their inner rings 25 on the base 1. The working surface of the copier 5 contains

copier 5 lever

straight a-b and curvilinear b-c sections, while the arc of a curvilinear section b-c is equidistant to the circumference of the cam arc 4. The ratio between the elements of cam 4 and the three-shouldered lever 7 is selected from conditions that exclude jamming of the transmission mechanism

along the longitudinal axis of the moving element 13 of the test joint 14-.

With the passage of the roller 12 curve of the linear area b-with the working angle

7 a fixed roller 11 rolls around the surface of the camcorder 4. As the cam 4 continues to rotate, the linear portion a-b of the working surface of the copier 5 n runs on the roller 11 of the lever 7, then turns counterclockwise with the fork 15, j and p 12 comes in contact with the surface of the cam 4.

1 TO

+) cos arcsin

f sino6 / 2

-rrf I cos oC / 2 eL;

sin / 3/2

one

g + h / 2

sin (x / 2,

five

five

0

five

where r is the radius of the disk cam 4j h is the shortest distance between the arc of the curvilinear portion b from the working surface of the copier 5 and the corresponding arc of the circumference of the cam 4; f - length of shoulders 10 three-shouldered

lever 7, equipped with rollers 11 and 12 ;,

ai is the angle between the shoulders 10 of the three shoulders arm 7; L is the distance between the axis of rotation of the disk cam 4 and the axis of the hinge 6 of attachment of the three-arm lever 7 to the base 1,

In - the central angle corresponding to the working surface of the copier 5.

The stand works as follows. The rotation of the electric motor 2 is transmitted through the gear 3 to the cam 4 with the cam 5. When the rectilinear section a-b of the working surface of the copier 5 rushes onto the roller 12 of the lever 7, the latter rotates counterclockwise and through the mechanism 9 rotates the fork 15 around the axis of the test joint 14, Force required to rotate the test hinge 14, is recorded using strain gauges 16. Together with the rotation of the fork 15, the direction of the radial loading force changes, always directed

copier 5 lever

along the longitudinal axis of the movable element 13 of the test hinge 14-.

When the roller 12 passes through the curvilinear section L-with the working surface 7 is stationary, and the roller 11 rolls over the surface of the cam 4. As the cam 4 continues to rotate, the straight line a-b of the working surface of the copier 5 runs onto the roller 11 of the lever 7, the latter turns counterclockwise together with fork 15, j and roller 12 comes in contact with the surface of cam 4.

Claims (1)

Image formula Stand for testing hinges containing 5 fixed 313 on it are supports for placing movable and stationary elements of the hinge, driving oscillatory movements of the moving element, loading radial forces and transmitting mechanism, characterized in that in order to increase the reliability of the results by reproducing the operating conditions of the hinges - a cam with a cam mounted on it with a copier hinged on the base with a three-arm lever, connect one arm with a transmission mechanism, cylindrical rollers mounted on two other arms of the lever and interacting with a cam cam, rings mounted on bearings of a movable hinge element placed on rings with a block and a compression spring installed between the block and the transmission mechanism, and the ratio between the parameters a cam with a cam and a three-arm lever are selected from the condition of exclusion of jamming of the transmission mechanism. / 2Ts 2Ts 21 20 FIG. 2 Editor A. Kozoriz Compiled by V. Danilov Tehred L. Serdyukova Corrector I. Erdeyi Order 1422/41 Edition 777 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4