SU798236A1 - Method of automatic maintenance of optimum ratio of linear speeds of lateral motion and of dredge scoop chain - Google Patents

Description

The invention relates to the mining industry and can be used in mining dredges.

There is a method for automatically maintaining the optimal ratio of linear speeds of lateral displacement and the scoop dredge chain, the essence of which is that the torque from an unregulated speed motor is fed through a torque converter and a planetary differential to the shafts of the scoop drum and the winch drum of the nasal ropes. With an increase in the load on the scoop chain, the scooping speed and the speed ’of rotation of the nose winch drum decrease simultaneously, i.e. speed of lateral movement of the dredge. With a decrease in the load on the scoop chain, the speeds of 'scooping and lateral movement increase [1].

The disadvantage of this method is that it does not provide optimal values for the rates of scooping and lateral movement for rocks of different strengths, since these values are determined by the load of the drive of the scoop-25 | reamer and fed to the input of the speed control system of the bow winch engine. The choice of a nonlinear block, the characteristic of which corresponds to the actual position of the coastal roller, produced by the operator [2].

The disadvantage of this method is the low accuracy of setting the speed of lateral movement associated with the difficulty of choosing the desired non-linear · _ block. In addition, manual operations for selecting non-linear blocks complicate the operator’s work, accelerate his fatigue and, thereby, contribute to a decrease in possible productivity.

Closest to the proposed technical essence is a method for automatically maintaining the optimal ratio of linear velocities of lateral movement and the dredger scoop chain, including measuring the linear speed of the scoop chain by measuring the rotation speed of the drive motor, measuring the average lateral displacement speed of the dredge, determining the discrete-constant signal and a signal of the current speed of lateral movement and the formation of a control signal for the speed of the lateral transition the premises of the dredge [3].

The disadvantage of this method is the presence of a significant error associated with the multilayer winding of the ropes on the drum, bow winches, as well as with the uneven speed of rotation of the engines over the discrete interval (the discrete interval is a certain angle of rotation of the dredge relative to its pile) With a uniform rotation of the bow winch engine and constant the speed of lateral movement of the dredge Vg _{1, the} value of the discrete-constant signal is determined by the relation =

In the next interval of discreteness, the value of the feedback signal defining the actual value of the lateral displacement velocity is

Iff ψζ Κ · ('' П ηι, where η _τ is the current value of the engine rotation speed.

With uniformly accelerated rotation of the engine during the discrete interval at the initial speed n ₀ = 0. to the final speed n _p = 2n ₄ and the average lateral displacement velocity Vg _cp = the discrete-constant signal is determined by the relation to * = vs · * - = <n „

2K <. ·

In the considered example, one and the same conditions of the second interval correspond to feedback signals that are two times different from each other.

The purpose of the invention is to improve the accuracy of maintaining an optimal ratio of linear speeds of lateral 'movement and dredged scoop chain.

This goal is achieved by the fact that the current value of the rope winding speed per drum and the average value for the rope winding speed per drum are measured and a discrete-constant signal is determined by dividing the average lateral displacement linear speed average for this interval by the speed value average over this interval winding the rope onto the drum, and the signal of the current speed of lateral movement is determined by multiplying the signal of the current speed of winding the rope on the drum to the disk Budget and a constant signal obtained in the preceding interval of discreteness.

The essence of the method is as follows.

In the first interval of discreteness, the average value for the interval of discreteness of the signal value of the linear velocity signal of lateral movement of the dredge and the average value for this interval of discreteness are measured of the signal of the linear velocity of winding the rope onto the drum of the bow winch.

Then, by dividing the signal value of the linear velocity of lateral movement of the dredge by the signal value ‘linear. the speed of winding the rope onto the bow-winch drum receives a discrete 4-constant signal and remembers it.

In the next (second) interval of discreteness, the current value of the linear speed signal of the scoop chain and the current value of the linear speed signal of the winding of the rope on the bow winch drum are measured. Then, the obtained value of the signal of the linear speed of winding the channel onto the bow winch drum is multiplied by the value of the discrete-constant signal obtained in the previous interval of discreteness, and the value obtained as a result of multiplication is compared with the value of the linear speed signal of the scoop chain. The difference signal obtained as a result of the comparison is fed to the input of the speed control system of the bow winch engines.

In the same interval of discreteness, the measurements are also made as in the first interval, and then a discrete-constant signal is obtained by dividing and memorizing it.

In the third interval of discreteness, all the same measurements are performed as in the second interval, multiply the value measured in this interval of the signal of the linear speed of winding the rope onto the drum of the bow winch by 5 the value of the discrete-constant signal; obtained in the previous (second) interval of discreteness and compared with the measured value of the linear velocity signal of the scoop chain speed measured in this (third) interval, the difference signal is again fed to the input of the speed control system of bow hoist engines.

In addition, as well as in the second. interval of discreteness, perform the measurements necessary to obtain a discrete-constant signal, which will be required in the next (fourth) interval.

With a uniform movement of the dredge ·.

K _l - _η γ4 γ ₂ K _f . η _τ .

With uniformly accelerated motion and an 'hal velocity of 0' „I 0 + 2n <_ ^V 6.cp ~ ^V 64 ^; , ⁿ cp ^_ 2 ⁿ <'at 25

I

(f? g = η _ψ = K _g Π _τ = ψ _ρ .

The uniformity of the engine speed does not cause an error in determining the feedback signal.

The drawing shows a block diagram. devices for implementing the proposed method.

The block diagram of the device includes an electric converter 1, an engine 2 of the winch of the nasal ropes, a drag 3, a tachogenerator 4 of the engine of the scoop chain, a guide roller 5 that moves freely within the length of the drum on a guide axle mounted on brackets rigidly fixed to the base of the bow winch, tacho generator 6 of the guide roller, meter 7 of the average value of the linear speed of winding the ropes of the bow winches, computing device 8, meter 9 of the average value of the linear speed of the lateral moved I dredge automated scoop drive circuit 10, the current cutoff unit 11 and an adder 12.

The method is implemented as follows.

The input of the electric transducer 1 from the tachogenerator 4 is supplied with a master ’signal for the rotational speed of the scoop engine, a negative feedback signal along the linear lateral movement speed from the computing device 8 and a current cutoff signal from block 11.

The measuring instrument 9 of the average linear speed of the lateral movement of the dredge contains, as a sensor of the meter for the angular displacement of the dredge for the Discreteness interval, a photo-optical sensor that multiplies the signal of the rotation angle of the Dredge by a signal proportional to the radius of the dredge, which depends on the angle of inclination of the scoop frame measured by the pendulum sensor.

The computing device 3 periodically (at the end of each discreteness material) divides the value of the signal received from the meter 9 of the average linear speed of lateral movement of the dredge by the value of the signal received from the meter 7 of the average linear speed of winding of the ropes for a given interval of discreteness, stores the obtained value and multiplies it the current value of the signal of the speed of rotation of the guide roller coming from the tachogenerator 6 during the entire subsequent interval of discreteness.

The use of the invention allows to increase the accuracy of the formation of the feedback signal for the speed of lateral movement.

In turn, an increase in the accuracy of generating a feedback signal leads to an increase in the accuracy of maintaining an optimal ratio of lateral displacement velocities c. the dredging chain of the dredge, which leads to an increase in the possible performance of the dredge, a decrease in the specific energy consumption of scooping, a decrease in the specific wear of the elements of the scooping device, and, as a result, an increase in the efficiency of the dredging process.

Claims (3)

1. USSR Author's Certificate No. 233049, cl. B 02 F 5/26, 1967. 2. Caspina T.N. On the issue of lateral speed control Pile drag .- Sat. Improving the automation of technological processes and electrical systems water on the drags. M., Tsvetmetinforda, 1970, p. 34-35. 3. USSR author's certificate No. 285850, cl. B 03 B 13/00, 1968.