SU977305A1 - Rack for testing conveyer belts - Google Patents

Description

The invention relates to conveyor transport and can be used to test samples of conveyor belts in a closed power loop.

A stand for testing belt drives is known, which can be used to test samples of conveyor belts, turn on a motor, drive a motor into motion, and test gear transfers energy to a tension shaft. The return of energy from the tension of the shaft to the drive is carried out by means of a locking gear, which is connected to the tension shaft by the driveshaft, allowing you to maintain the required pre-tension of the test gear regardless of belt tension. I can be used mechanically, electrically or hydraulically 1.

The disadvantage of this stand is that only one sample can be tested simultaneously in a closed loop.

Closest to the proposed set of features and the achieved result is a stand for testing conveyor samples

ribbons, including parallel driving and driven shafts mounted on the frame with drums attached to them, oxides of test samples of conveyor belts having different diameters that are equal in pairs, and tools for tensioning the tested samples of conveyor belts. Driving and driving shafts

10 are connected by a chain drive 21. In a well-known stand, a chain drive included in a closed loop creates dynamic loads due to the pulsation rate inherent in

15 all chain drives. However, such a loading mode does not correspond to the simulated working process and therefore reduces the reliability of the semi4aeNwx when testing the results.

20

The purpose of the invention is to increase the reliability of the test results. .

This goal is achieved by the fact that the test bench for samples of conveyor belts, including in parallel mounted on the frame

and driven shafts with drums attached to them, covered by test samples of conveyor belts and Iminitsimn are different in pairs

Claims (2)

0, between themselves, diggers, and tools for tensioning the tested samples of conveyor belts, equipped with a leveling mechanism, located between the drive and driven shafts and made in the form of a crankshaft with the ends turned relative to each other in the vertical plane with the ends installed with tested samples of conveyor belts in the cross (the middle of the span between the drums of the driving and driven shafts, while the knee and the shaft have a bracket fixed to it with a counterweight and Fig. 1 shows a stand for testing conveyor belt samples, top view, and Fig. 2 is the same, side view (Fig. 3), a crankshaft with counterweight and rollers. in a closed power circuit consists of a drive shaft 1, connected to the engine by transmission 2 and drums 3 and 4 rigidly fixed on it, driven propeller shaft 5, with drums 6 and 7 fixed on it, diameters of drums 3, 7 and 4, 6 are pairwise equal to each other, but the diameters of one pair are different from the diameter The other pair of drums 3 and 6, 4 and 7 rounds around the test samples of conveyor belts 8 and 9, respectively. Tensioning devices 10 and 11 are mounted on the driven shaft 5, which make it possible to produce a preliminary tension of tape samples. Between the driving 1 and the driven 5 shafts there is an equalizing mechanism designed parallel to them mounted on the frame in the bearings of the crankshaft 12, one shoulder 13 of which rotated relative to the other 14 in the vertical plane at an angle of 45-180. Rollers 17 and 18 are mounted on bearings 15 and 16 on shaft 12 and bearing on test samples of ribbons 8 and 9 in the middle spans between drums 4, 7 and 3, b, respectively. In addition, on the shaft 12, the counterweight 19 is rigidly fixed on the bracket 20. The leading 1 and the driven 5 shafts are arranged parallel to the frame 21. The stand operates as follows. Tensioning devices 10 and 11 pre-tension the samples of the strips 8 and 9 when the engine is turned on. transfer 2 is transmitted first to shaft 1, and then through samples of ribbons 8 and 9 to the driven shaft 5 and equalizing rollers 17 and 18. Moreover, due to the elastic slip of the tested samples of ribbons 8 and 9 on drums 4, 7 and 3, b due to the difference their diameters are created closed utui power circuit. If the power transmitted by one of the samples, and, consequently, its tension, exceeds the power and tension of the other, which may be due in part to the difference in the elastic characteristics of the samples of the tapes 8 and 9, then the pressing force (equivalent to tension) on the rollers 17 and 18 from the side of the tapes will be different. As a consequence, a torque occurs and the shaft 12 rotates through a certain angle. Turning the shaft 12 leads to a change in the lengths of the samples of the bands 8 and 9 due to their elastic deformations and the tension of both samples are automatically aligned. The counterweight 19 serves to compensate for the moment created by the weight of the rollers 17 and 18. The proposed implementation of the stand improves the reliability of the test results by eliminating the dynamic loads caused by the chain transmission, and allows us to reasonably predict the durability of the conveyor belts in operation and plan their release. Claims for testing samples of conveyor belts, including parallel-mounted leading and driven shafts on a frame with drums fixed to them, covered by tested conveyor belt samples and having different diameters equal in pairs to each other, and tensioning devices for tested conveyor belt samples that differ that, in order to increase the reliability of the test results, it is equipped with an equalizing mechanism located between the driving and driven shafts and made the crankshaft with the ends rotated relative to each other in the vertical plane, having rollers installed with the possibility of contact with the test samples of conveyor belts in the middle of the span between the driving and driven shaft drums, while the crankshaft has a counterbalance fixed on it and mounted on the frame - with the possibility of turning. Sources of information taken into account during the examination 1. Raietov D.V. and others. Machines and stands for testing details. M. Mechanical Engineering, 1979, p. 173-186, fig. 5.1.in. 2. USSR author's certificate No. 492766, cl. G 01 L 5/04, 1974 (prototype).