SU785148A1 - Device for controlling a multimotor load-handling unit with flexible traction member - Google Patents

Description

one

The invention relates to control means and can be used to control multi-drive lifting and transporting installations, for example, conveyors with a flexible body 5:

A device for controlling a conveyor is known that measures the speed of movement of a conveyor belt using magnetic conductors, including magnetic conductive marks in the belt and the magnetic conductor associated with the inductor. sensor located under the tape l.

The drawback of the device is that t5 has low accuracy in controlling the speed and, consequently, the thrust force transmitted by the driving drums of the tape by this device, is low due to the low frequency of the conductive 20 marks and the fact that the total draw of the tape is not taken into account when the load changes. In addition, the wear of the edges of the tape, which occurs during operation, and the disappearance of marks due to this, reduces the reliability of the device.

It is also known a device for controlling a two-drive conveyor system, comprising control units for driving motors with sensors.

force transducers, two functional converters, three summation units, dynamic force loss sensors, a dividing unit and a comparison unit 2.

The well-known device has a comparatively low control accuracy of the driving moments, and, consequently, the driving forces of the driving drums, since it does not take into account the pull of the traction body when the load on it changes, and therefore does not provide sufficient reliability of control of the conveyor installation.

The aim of the invention is to improve the accuracy and reliability of controlling a multi-drive lifting and transporting installation with a flexible traction body by distributing the tractive effort between the driven drums depending on the load change on the traction device.

Claims (2)

This goal is achieved by the fact that the device is equipped with an additional traction force sensor in the collecting branch of the traction organ, a second dividing unit and a third functional converter, the output of which is connected to one of the inputs of the cjpaBnj unit, and one input to the second dividing unit. of the inputs of which is connected to the output of the third block of circulation, and the second one is connected with the sensor of tractive force in the running branch of the body and one of the inputs of the third summation block. Such an embodiment of the device makes it possible to determine the actual relative ratio of the driving forces of the driving bars, to compare it with the ratio of the loading forces that is optimal for a given load on the traction body and with the help of. This signal more accurately adjusts the distribution of the force between the drive drums. This eliminates the possibility of slippage of the drums, the reverse movement of the traction unit with the load and the associated emergency operations, and, consequently, the reliability of the control of the lifting and transport system is increased. In the drawing, a functional diagram is shown of a device for controlling a lifting and transporting installation with a flexible cable body. The device contains: functional converters 1, 2, the inputs of which are connected to the outputs of the control units, driving motors 3, 4 with the traction force sensors, and the outputs - the first inputs of the summation blocks 5, 6, to the second inputs to the trough GDGDT connected loss sensors The dynamic forces 7, 8. The outputs of the summation blocks 5, b are connected to the inputs of the summation block 9 and to the inputs of the division block 10, which is connected to the first input of the comparison block 11, the second input of which is connected Odom blokZ divider 13, whose input is connected to the output summing unit 9 and vyhodom pulling force sensor 14 in the trailing branches of the traction body, whose output is connected also to a third input of summing block 9. The device operates as follows. . The signals taken from the sensors of the driving forces of the drive motors, direct current, and alternating (if there is a direct current in the power circuit, or an active power sensor in the AC drive) are riponojpical values of the tractive effort, pasBHBaeNMX with powered motors , are applied to the functional transforms 1, 2, at the output of which we receive signals corresponding to the Wels and HaW dynamic loads of driving motors F (j4, .2., which enter the summation blocks 5, 6 where the algebraic cK is summed from the MDF & Yokesh TytovSh g S1SHGG gsch mts mi on couplings / in REDUktoe ah, on: prim drums, the magnitudes of which to the lens by means of tractive force loss sensors 7, 8, At the outputs of summation blocks 5, b signals are output that are proportional to traction. p, Fj of the driving drums, which enter the summing unit 9 and the separating unit 10, the output signal of which is proportional to the actual ratio of the driving forces of the driving drums (FilFj) -g. The signal taken from the output of the force sensor 14 is proportional to the tractive force in the descending branch S (; f of the traction body) enters the dividing unit 13 and into the summing unit 9, where it is algebraically summed with the values of the specific forces of the driving drums and from the output of the unit 9 a signal is given that is proportional to the thrust force arising in the incoming branch of the SJ, J branch body. This signal arrives in a dividing unit 13, the output of which produces a signal proportional to the optimal ratio of the thrust forces in the incident and accumulated x Sjjj-XS j which enters the functional converter 12, the output of which produces a signal proportional to the optimum for a given load on the traction body, the ratio of the driving forces of the driving drums (). g. Signals taken from the outputs of blocks 10 and 12 are compared in magnitude in comparison unit 11, at the output of which a signal appears that is proportional to the deviation of the actual ratio of the driving forces of the driving drums from their optimum ratio, it is a correction signal and is fed to the control systems audio privodnyyi motors 3, 4 with a specific mark, causing a redistribution of traction forces between the drive Bahrag banamy for consistency with the load on the traction organ. If the signal at the output of the comparator unit 11 is zero, then the weight between the drive drums is distributed in accordance with the load on the traction body and the lifting and transport unit works in the optimal mode. The device for controlling a multi-drive lifting and transporting installation with a flexible traction unit allows for this by distributing the pulling forces between the driving drums, depending on the change. loads on the traction body, improve the accuracy and reliability of control. This ensures maximum utilization of the drive capabilities of the drive drums, decreases the likelihood of skidding and abrasion of the lining of the drive drums and the expensive traction organ, increases the duration of the drainage time, and consequently reduces the cost of repair and restoration work. In addition, the rational distribution of tractive effort between the drive drums ensures a uniform (proportional to the power) load of the drive motors, as a result of which they are overloaded, the service life and energy indicators (power and efficiencies) are increased. Reducing plant downtime associated with the failure of the 1st engine drives, the lining of the driving drums and the traction body, allows for an increase in the productivity and efficiency of the hoisting and transport system. Apparatus of the Invention A device for controlling a multi-drive lifting and transporting unit with a flexible traction device, containing drive control units with traction force sensors, two functional generator units, three summation units, dynamic force loss sensors, and a comparison unit differing in in order to increase the accuracy and reliability of control, it is equipped with an additional pulling force sensor in the running branch of the traction body, the second dividing unit and the third functional a converter whose output is connected to one of the inputs of the comparison unit, and the input to the output of the second dividing unit, one of the inputs of which is connected to the output of the third summation unit, and the second to the traction force sensor in the descending branch of the traction body and one of the inputs third block summation. Sources of information received so attention during the examination 1. USSR author's certificate No. 488764, cl. B 65 G 43/00, 1/16/76. 2. Nazarenko, V. M, et al. On the question of constructing optimal control systems for two-drum conveyors with a common flexible body Mining Journal, lime, Universities, 4, 1974, p. 158-160.