SU1649347A1 - Stand for testing continuous chains - Google Patents

Abstract

The invention relates to a testing technique, in particular to testing circuits with a closed Loop, the purpose of the invention is to expand the range of tests and reduce the dimensions of the stand. On frame 1 there are pairs of driven 4 and driven 5 stars with test chains 6 and 7. Between shafts 2 and 3 there is a hinged-lever mechanism in the form of a pair of levers hinged to sliders 12 and 13. Levers 15 and 16 of one pair and the levers 17 and 18 of the other pair are connected by hinges respectively. 19 and 20. The loading lever 22 is hinged but connected to the slider 12. On the crawler and 21 W 24,% & s

Description

7

Fl.1 7

na 12 and 13 are set accordingly. tension devices 25 and 26, on which the working branches 8 of the test chains 6 and 7 are located. The force from the spring 23 is transmitted through the loading lever 22 to the slide 12, and to the other slide 13 through the levers 15, 16,

17 and 18. The sliders I2 and 13, through the tensioning devices 25 and 26, create a tension force in the working branches x 8 chains i 6 and 7. Due to the loading of the working branches by the tilt-lever mechanism, the range of tests is extended and the dimensions of the stand are reduced, 2 of them.

The invention relates to testing equipment, in particular to testing circuits with a closed loop.

Nel invention - expanding the range of testing and reducing the dimensions of the stand.

Figure 1 shows the stand (diagram) a general view; figure 2 - stand in the plan (axonometric).

The bench contains frame 1, pairs of shafts 2 connected to it and 3 driving 4 and 5 star driving stars for placing test chains 6 and 7 on them, each of which has a working 8 and a single 9 branch with a different number of links. The driven shaft 3 is fixed on the lever 10, which is pivotally supported on frame 1 and is limited from the load-bearing element 1I. Between the drive 2 and the driven 3 shafts, there is a multilink flat articulated lever mechanism, made in the form of two sliders 12 and 13, placed respectively in the vertical guides 14 of the frame 1 in the form of two pairs of levers of equal length. The levers 15 and 16 of one pair and the levers 17 and 18 of the other pair are interconnected, pivotally, and the hinges 19 and 20 are located in horizontal guides 21. The free end of the levers 15 and 16 are gaternally connected to the slider 13, and the free end of the levers 17 and 18 The hinge is connected to the slider 12. On the frame 1, a loading lever 22 is pivotally mounted, which is pivotally connected to the slider 12. The free end of the loading lever 22 is placed with the possibility of engagement with the spring 23 through a pressure screw 24. Each of the sliders 12 and 13 has a tensioning device 25 and 26 respectively In this case, tension device 25 is in interaction with working branch 8 of test circuit 6, and tension device 26 is connected with working branch 9 of chain 7. Tension devices 25 and 26 can be performed

For example, in the form of tensioning stars, or in the form of chain guides. The stand works as follows. The force from the spring 23 is transmitted through the loading lever 22 to the slider.

12 directly, and on the other slider 13 — through pairs of expanding levers 15, 16, 17, and 18. Sliders 12 and 13, through tensioning devices 25 and 26, interact with the working branches 8

chains 6 and 7, creating tension in them, Tt determined by durmula

thirty

9: 1

4- sindC

five

0

0

five

one . where 1 is the distance from the point of attachment of the loading lever to the line of action of the force from the spring;

the distance from the point of attachment of the loading lever to the line of action of the force from the guide element; WB is the angle of inclination of the working branch to the plane passing through the axes of rotation of the shafts (driven and driven); Q - spring force. At small angles oi, provided with the stand design, a relatively small force of the spring 23 provides a large tension force in the working branches x. The design of the stand ensures the equality of the angles in the working branches x, as well as the identical geometry of both working branches. The force in the working branches x is controlled by the force-measuring element 11,

The use of the proposed test bench, as compared with the known, taken as a prototype, allows the testing range to be expanded by providing

test various escalator nodes. In addition, the dimensions and weight of the stand are reduced by making the loading device in the form of a multi-link articulated lever mechanism.

Claims (1)

Invention Formula Stand for testing circuits with a closed circuit, containing a frame, placed on the frame of a pair of drive and driven sprockets connected by shafts for placing test chains on them and a spring-loaded loading lever with a screw drive, characterized in that in order to extend the range of testing and reduce the dimensions of the stand, It is equipped with two tensioning devices for tensioning the working branches. 73 at the tested chains and the multi-tier flat hinged-lever mechanism, made in the form of two sliders AND two pairs of levers hingedly connected to them, each of the sliders placed in the vertical guides made in the frame and installed in contact with the corresponding tensioning device, two pairs of levers are made the same the lengths, the levers of each pair are interconnected pivotally, the hinges of each pair are placed in the horizontal guides made in the frame, the free end of each lever of the mechanism is pivotally connected to one m of the sliders, while the loading lever is pivotally fixed on one of the sliders and is installed with the possibility of interaction with the latter. four 18 12 fie1