RU228270U1 - Test stand for chain drives of drive roller conveyors for piece goods - Google Patents

Abstract

The utility model relates to the field of testing equipment and can be used for testing chain drives of drive roller conveyors for piece goods. The technical result of the proposed utility model is a reduction in energy costs when testing chains by using a mechanical device that allows for loading the chain. In order to achieve the technical result, a stand is proposed for testing chain drives, containing a mechanical device for loading the chain, consisting of a drive roller with a driven sprocket fixed to it, transmitting the drive torque from the chain to the drive roller, and a brake band encircling the drive roller, one end of which is rigidly fixed to the frame of the stand, and the other is fixed to the locking lever, in the holes of which control weights are placed, creating a moment of resistance to rotation of the drive roller under the action of gravity. 3 fig.

Description

Field of technology

The utility model relates to the field of testing equipment and can be used for testing chain drives of drive roller conveyors for piece goods.

State of the art

Drive roller conveyors for piece goods during their serial production require testing of chain drives under load when the conveyor is operating in start/stop mode.

The test benches for such tests contain a drive electric motor for setting the chain under test in motion, a gearbox, and a device for mechanically loading the chain. An electric generator is most often used as a device for mechanically loading the chain, and the kinematic diagram of the test bench may include a leading and idle chain branch, leading and driven sprockets, several bypass and tension sprockets, and tensioners.

A test rig for chains is known [1], which includes an electric motor, a drive shaft with two sprockets, two chains engaged with two sprockets of the drive shaft and two additional sprockets.

A wave motor is used to load the tested chain drives.

The disadvantage of this stand is the need to use a special wave motor as a device for mechanical loading of the circuits, which significantly increases the cost of electrical equipment and energy consumption during testing.

There are known stands for testing chain drives [2-5], including a drive motor and a load generator, a chain drive containing a chain under test with a driving and idler branch, a driving and driven sprocket, as well as additional sprockets and devices for moving these sprockets, a voltage regulator supplied to the drive motor and generator, control and protection devices.

The disadvantage of the described designs (including the closest analogue [5]) is the method of regulating the load using a generator, which significantly complicates the electrical control circuit of the stand, increases the cost of electrical equipment and energy costs during testing.

The objective of the utility model is to simplify the design of the test bench while expanding its functional capabilities.

Disclosure of a utility model

The technical result of the proposed utility model is a reduction in energy consumption during circuit testing.

The stated problem is solved in that the stand for testing chain transmissions contains an electric motor with a gearbox, a mechanical device for loading the chain, a driving, driven, intermediate and tension sprockets, wherein the mechanical device for loading the chain consists of a drive roller with a driven sprocket fixed to it, transmitting the drive torque from the chain to the drive roller, and a brake band encircling the drive roller, one end of which is rigidly fixed to the frame of the stand, and the other is fixed to the locking lever, in the holes of which control weights are placed, creating a moment of resistance to the rotation of the drive roller under the action of gravity.

Reduction of energy consumption during chain drive testing is possible by replacing the load generator with a mechanical device, for example, a friction device, the simplicity of the design of which is due to the fact that the load on the chain is created by creating a moment of resistance on the driven sprocket from the drive roller. The moment of resistance on the drive roller is created as a result of friction of the friction material attached to the flexible steel tape along the cylindrical surface of the drive roller shell. In this case, the moment of resistance is regulated by changing: the mass of the control weights; the length and mass of the locking lever on which the control weights are placed; the diameter of the drive roller; the angle of grip of the drive roller by the brake tape; the coefficient of friction.

List of figures

Fig. 1 shows a general view of a test stand for testing chain drives of drive roller conveyors for piece goods.

Fig. 2 shows a general view of a mechanical device for simulating a chain load (the frame of the stand is shown conditionally).

Fig. 3 shows a diagram of a mechanical device for simulating a circuit load.

Implementation of a utility model

The test rig for testing chain drives of drive roller conveyors for piece goods (Fig. 1) consists of a frame 1, a drive motor-reducer (an electric motor with a reducer) 2, a mechanical device for loading the chain, a drive sprocket 4, an idler sprocket 5, tension sprockets 6, a drive roller 7 with a driven sprocket 8.

The mechanical device for loading the chain (Fig. 2) consists of a drive roller 7 with, for example, a welded driven sprocket 8 fixed to it, transmitting the drive torque from the chain 3 to the drive roller 7, and a brake band 9, which covers the drive roller 7. One end of the brake band 9 is rigidly fixed to the frame 1 of the stand, and the other is fixed to the locking lever 10, on which control weights 12 are placed in holes 11.

The device allows to create a moment of resistance Mc on the drive roller 7, and consequently, through the driven sprocket 8 and on the chain 3, simulating the load in chain transmissions of drive roller conveyors when moving piece goods, for example, pallets on rollers, and to conduct chain tests when rotating the drive roller 7 in two directions (clockwise and counterclockwise).

The moment of resistance Mc simulating the chain load (Fig. 3) is created by the weight Ggr of the control load 12 as a result of the friction of the brake band 9, consisting, for example, of a friction material attached to a flexible steel band, along the cylindrical surface of the shell of the drive roller 7 during its rotation.

With the direction of rotation of the drive roller 7 indicated in (Fig. 3) (clockwise), the moment of resistance Mc developed by the device is equal to:

where f is the coefficient of friction between the surface of the drive roller shell and the friction material of the brake band; R is the radius of the drive roller shell; α is the angle of wrapping of the drive roller by the brake band; Gp is the weight of the locking lever; Ggr is the weight of the control load; a, b, c are the dimensions according to Fig. 3.

When changing the direction of rotation of roller 7 (counterclockwise) with unchanged values of other parameters, such as the mass of the control load, the length of the locking lever, the angle of grip, the coefficient of friction, the moment of resistance Mc is obtained in times less.

Since the friction coefficient f and the angle of wrap a are included in the exponent of the exponential function, even a small change in them causes a significant change in the moment of resistance Mc, which is also an important advantage of the proposed design of the device and allows for an even greater expansion of the limit of regulation of the moment of resistance Mc.

Thus, the specified design features of the mechanical device simulating the load in chain transmissions of drive roller conveyors for piece goods significantly expand the functional capabilities of the stand.

The stand has a simple design and, due to the ability to change the mass of test loads and their placement on the locking lever, the angle of grip, and the coefficient of friction, it allows varying the moment of resistance Mc within wide limits and testing chain transmissions of drive roller conveyors for two directions of chain rotation, taking into account the mass of the load on the pallet, the speed, and the number of pallets on the conveyor.

The proposed test rig for testing chain drives of drive roller conveyors for piece goods allows achieving the stated technical result, namely, reducing energy costs and expanding the functional capabilities of the rig by using a mechanical device that allows for a load to be applied to the chain and consisting of a drive roller with a driven sprocket fixed to it, transmitting the drive torque from the chain to the drive roller, and a brake band that covers the drive roller, one end of which is rigidly fixed to the frame of the rig, and the other is fixed to the locking lever, in the holes of which control weights are placed, creating a moment of resistance to the rotation of the drive roller under the action of gravity.

Sources of information

1. Patent for invention of the Russian Federation No. 2338170. Test bench for chains / I.G. Strizhkov, S.I. Strizhkov, E.V. Farafonova, E.A. Khorkov, A.V. Shakirova. B.I.// B.I. 2008, No. 31, Published 10.11.2008.

2. Patent for invention of the Russian Federation No. 2343442. Test bench for chain drives / I.G. Strizhkov, R.R. Beglyarov, L.G. Strizhkova, E.V. Farafonova, E.A. Khorkov, E.N. Chesnyuk// B.I. 2009, No. 1, Published 10.01.2009.

3. Patent for invention of the Russian Federation No. 2 362 982. Test rig for chain drives with synchronous machines / Strizhkov I.G., Beglyarov R.R., Strizhkov S.I., Trubin A.N., Khorkov E.E., Chesnyuk E.N.// B.I. 2009, No. 21, Published 27.07.2009.

4. USSR A.s. 1596219. Test rig for safety clutches / Strizhkov I.G., Zavgorodniy V.P. // Bulletin No. 36, Published 30.09.90.

5. Patent for utility model RU 147242. Test bench for chain drives / S.B. Berezhnoy, A.V. Puntus, N.V. Mevsha, A.A. Voina, G.V. Kurapov // B.I. 2014, No. 30, Published 10/27/2014.

Claims (1)

A test rig for testing chain drives of drive roller conveyors for piece goods, comprising an electric motor with a gearbox, a mechanical device for loading the chain, a drive, a driven, intermediate and tension sprockets, characterized in that the mechanical device for loading the chain consists of a drive roller with a driven sprocket fixed to it, transmitting the drive torque from the chain to the drive roller, and a brake band encircling the drive roller, one end of which is rigidly fixed to the frame of the rig, and the other is fixed to a locking lever, in the holes of which control weights are placed, creating a moment of resistance to the rotation of the drive roller under the action of gravity.

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