SU740635A1 - Conveying speed control method - Google Patents

Description

one

The invention relates to transport installations of movement of objects of considerable length compared with the distance between the drives and can find application in control systems of roller tables, rolling stock, conveyor trains, etc., mainly with a linear electric drive.

The known method of controlling the speed of transportation, in which the drive is turned on with a force corresponding to the required speed, and then the actual speed is quantified in the process of transurting, it is compared to the set speed and the signal of the difference between these speeds until the transporting object will move at a given speed i.

The change in the actual speed of porting and the regulation during the process of transporting the traction force of the drives make the speed regulation in this way complex and requiring expensive, complicated and unreliable devices.

The known method of controlling the speed of conveyors 1n, also containing the inclusion of drives with a pulling force in accordance with the required speed, the intention of the actual speed of the object, comparing it with the required speed and adjusting the difference between these speeds of pulling force from the drives 2.

Controlling the speed of transporting in this way is also difficult, because it requires measuring the actual speed, which is associated with the use of complex and unreliable devices.

In addition, since the speed is determined by adjusting the traction force by a hi-vis, this, in turn, requires sophisticated devices to make this adjustment.

The purpose of the invention is to simplify the speed control procedure.

Claims (2)

This goal is achieved by the fact that at HSh the initial moment of transportation of the BLCC is driven by a drive with a tractive force corresponding to the required speed. In this case, the drive amplification is located: the front of the object being transported is directed in the direction opposite to the transportation, and then at intervals of time equal to the ratio of the distance between the drives to the required speed, turn off the drive with a pull force directed against the transport in turn. protractors, ani,: and drive actuators, the thrust force of which is set in the direction of transport; i FIG. 1 shows the ngPal moment of transportation, the position of the object of transportation and the condition of the drives through a time equal to one and two switching periods from the moment of the beginning of the transplanting; Fig, 2 is a block diagram of a device that implements the method. The drives 1-12 are designed to transport the object 13. The transportation is carried out as follows. At the initial moment, actuators are turned on, for example, 1-4 with the required pulling force P, directed toward the transport side. Simultaneously with them, actuators 8-10, immediately before the object of transportation, are switched on, the pull force of which P „is directed in the opposite direction. Under the action of the force RD, object 13 starts moving and rae chases to the required speed. After a time equal to the switching period, i.e. the ratio of the distance between the drives to the desired speed, turn on the drive 5 and at the same time turn off the drive 8 and turn on the drive 11, the action of which is directed in accordance with the rest of the brake group drives. After a time equal to two switching periods, the drive 6 of the transport and 12 brake groups is turned on and the drive 9 is turned off. The epot process is conducted during the entire transportation time. Thus, a traveling wave, formed by operating the drive & The speed of movement of this wave is equal to the required transport speed. In this case, the speed of movement of the transported object will be determined by the speed of the wave. If for some reason the object's speed increases in comparison with the required one (for example, on the descent), then it is ahead of the wave, then 74 54 is affected by drives with a thrust force Rd directed against Transportation, which will limit its speed to a predetermined value , because the braking force P ,, will act on the object of transportation and limit its speed until it lags behind the movement of the braking wave, i.e. the object does not come out of the zone of action of the braking drive group. And this will correspond to the movement of the object with the required speed. When the speed of the transported object decreases, it starts lagging behind the speed of the wave, and therefore is affected by a larger number of wires with a pulling force directed towards the Transportation, as a result of which the object accelerates to required speed. Thus, since the speed of movement of an object after its acceleration is determined by the speed of movement of the wave, by changing the switching period of the drives, it is possible to change the transport speed. As the object moves, the actuators that are operated can be disconnected either by a given program or by position sensors. By adjusting the transport speed in this way, the entire control system is greatly simplified, thus eliminating the need for. information about the actual speed of the object. Suppose there is a distributor (multistage Trigger, step finder, shift register) whose number of outputs corresponds to (or is equal to) the number of engines located: along the transport line. The signal at the outputs of the distributor is alternately mixed as the master oscillator G. works. Each of the outputs B is associated with its group of motors (drives). Hanpi-f ®Р Gkho B includes (or gives permission to start) engines.,. D, L (+ (Fig. 2), the latter affect the object being transported. At the next clock of the master oscillator, the signal at output B disappears and appears at the output. In this case, the engines D, D, D e-gs by any switching unit, for example, a thyristor unit.Thus, the work program (algorithm) of the transport installation is defined by one decalgator and a set of elements OR, the reliability of the software device is confirmed by all the experience of modern computing obnye elements encoding function is performed, summation, decryption, etc. Rebota programmnoth) of the device and, therefore, the wave speed is determined only by the driving frequency (clock) of the generator and does not need information about the velocity of the transported object. Formula from Gaining The method of controlling the speed of transportation, which consists in the fact that at the initial moment of transportation the drive is connected with a tractive force corresponding to the required speed, the actual speed of the object is measured, compared with the given speed and further adjustment of the compression; tO L ooo / 2 5 "5 6 7 S 9 iO // a ff i-t, / g 5 "56" f / a // / a / 1 g ®®®®OOO / g 5 4 J 6 7 j y / 0 // / g . / Ci oo f ooo ® (O 8) About The peaks are produced according to the mismatch signal of a given and actual speed, characterized in that, in order to simplify the speed control, the high force of the drives located in front of the conveyed object is directed in the direction opposite to the conveying, and then at intervals equal to the ratio of the distance between the distance to the required speed, alternately in the direction of transport, turn off drives with traction force, directed against transportation, and include drives, traction effort for example Avleno in the direction of transportation. Sources of information taken into account in the examination 1. For the Germany, No. 2152752, cl. q 05 D 13/00, B 60 L 15/20, published. 1973. 2. For France No. 2223207, cl. B 60 L 15 / OO, published 1974 (prototype). Uft / J "" four