RU2552759C1 - Belt conveyor intermediate drive and method of its control - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: proposed intermediate drive comprises endless drive belt arranged above load-carrying belt in contact therewith and running on rollers over driven and tensioning drums, driven drum motor and drive control unit. Besides, it incorporates the load-carrying and driven belt speed transducers arranged at or ahead of the contact points, At acceleration and run of load-carrying belt at driven belt constant speed V_db at contact with load-carrying belt is varied in the range V_lc < V_db ≤ V_lc+Δ, where V_lc is load-carrying belt speed at contact with drive belt or before this contact, Δ is admissible driven belt slippage relative to load-carrying belt. At deceleration of load-carrying belt, speed of driven belt at contact with the latter varies as V_lc-Δ ≤ V_db+V_lc.

EFFECT: higher operating efficiency.

4 cl, 4 dwg

Description

The invention relates to mechanical engineering, and in particular to drives of conveyor belts.

Known belt conveyors with intermediate drives having increased sliding due to the use of turbo couplings or the inclusion of additional resistance in the rotor circuit of an induction motor [1].

Increased slip provides a more even load distribution between the drives, but leads to an increase in energy losses. In addition, in such drives, the speeds of the drive belts are not consistent with the speed of the load-carrying tape, which leads to increased wear of the belts.

Known intermediate drive belt conveyor containing located under the load-bearing branch of the conveyor belt closed on the drive and tension drums drive belt, the upper branch of which is located under the load-bearing branch of the conveyor belt and rests on its roller bearings, and the lower branch using the pressure rollers is pressed against the idle branch of the conveyor belt [2].

The disadvantage of this drive is the inability to coordinate the driving speeds of the drive and conveyor belts, leading to increased sliding and increased wear of the drive and conveyor belts. In addition, modes of operation of such a drive are possible when either one of the branches of the drive belt, or both will brake the conveyor belt.

A known method of controlling the intermediate drive of the conveyor belt, which consists in changing the speed of rotation of the drive drum according to a given mode of operation of the conveyor belt [3].

The disadvantage of this control method is the inconsistency of the driving speeds of the drive and conveyor belts, leading to increased sliding and increased wear of the drive and conveyor belts.

The task of the invention is to increase the efficiency of the intermediate drive belt conveyor.

The intermediate drive of the conveyor belt includes a closed drive belt located under the load-bearing belt and in contact with it, supported by roller bearings and covering the drive and tension drums, the drive drive electric drive, the drive control unit.

According to the invention, the intermediate drive of the conveyor belt is equipped with speed sensors of the load-carrying and drive tapes installed at the point of contact of the load-bearing and drive tapes or in front of the place of contact of the load-bearing and drive tapes.

The speed sensor of the load-carrying tape is mounted on the roller support in front of the place of contact of the load-carrying and drive belts.

The speed sensor of the drive belt is mounted on the roller support at the contact point between the load-bearing and drive belts or on the tension drum.

A method for controlling an intermediate drive of a conveyor belt includes changing the speed of the drive belt according to a predetermined mode of operation of the conveyor belt, which accelerates the load-carrying belt, moves the load-carrying tape at a constant speed, slows down the load-carrying belt, stationary state of the load-carrying belt.

According to the invention, in the acceleration modes of the load-carrying tape and the movement of the load-carrying tape at a constant speed, the speed of the drive belt V _P at the point of contact with the load-bearing tape is varied within

V _G <V _P ≤V _G + Δ,

where V _G is the speed of the load-carrying tape at the place of contact with the drive belt or in front of it, Δ is the permissible slipping speed of the drive tape relative to the load-carrying tape, in the mode of deceleration of the load-bearing tape, the speed of the drive tape at the point of contact with the load-bearing tape is varied within

V _G -Δ≤V _P <V _G.

When carrying out the invention, a technical result can be obtained consisting in increasing the efficiency of the intermediate drive of the conveyor belt.

The specified technical result is achieved in that the loss of electricity and wear of the drive and conveyor belts are reduced. In addition, the reliability of the drive is increased by eliminating the possibility of unintended braking of the load-carrying belt.

Figure 1 shows a diagram of an intermediate drive belt conveyor;

figure 2 - diagram of the intermediate drive of the conveyor belt with speed sensors installed in front of the contact point of the load-carrying and drive belts;

figure 3 shows a section aa in figure 1;

figure 4 is a view of B in figure 1 (the transported load and the tension device are conventionally not shown).

The intermediate drive of the conveyor belt includes a closed drive belt 1 located under the load-carrying belt 2 with the transported cargo 3 and in contact with it. The load-carrying tape 2 rests on the roller bearings 4, 5, 6, 7. The drive belt 1 rests on the roller bearings 5, 6, 8 and covers the drive 9 and tension 10 drums. The tension drum 10 is moved by a tensioning device 11, for example screw, and pulls the drive belt 1. The drive drum 9 is connected to an electric drive (not shown), for example, integrated inside the drive drum 9.

The control unit 12 is connected to the power supply line 13, and is also connected by a cable 14 with an electric drive.

The intermediate drive of the conveyor belt is equipped with a speed sensor 15 of the load-carrying belt 2 and a speed sensor 16 of the drive belt 1.

The sensor 15 is mounted on a roller support 7 in front of the contact point of the load-carrying 2 and drive 1 tapes. The sensor 16 is mounted on the roller support 6 in the place of contact of the load-carrying 2 and drive 1 tapes. The sensors 15 and 16 are connected to the control unit 12 by cables 17 and 18. It is possible to install the sensor 16 on the tension drum 10 (not shown).

It is also possible to install sensors 15 and 16 in front of the contact point of the load-carrying 2 and drive 1 tapes (figure 2). In this case, the sensors 15 and 16 measure the speed of the load-carrying tape 2 and the drive tape 1 using a contact or non-contact method.

The intermediate linear drive belt conveyor operates as follows.

Electricity from line 13 through the control unit 12 via cable 14 is supplied to the electric drive, which drives the drive drum 9. The signals of the sensors 15 and 16 via cables 17 and 18 are sent to the control unit 12.

When the drive drum 9 rotates, the traction force from the drive belt 2 is transferred to the load-carrying tape 1 at the site of their contact between the roller bearings 6 and 5 due to friction forces.

The tension of the drive belt 2 is carried out by moving the tension drum 10 by means of the tension device 11.

When the drive drum 9 is rotated clockwise (the direction of rotation is indicated by the arrow in FIG. 1, FIG. 2), the moving load-carrying belt 2 comes into contact with the drive belt 1 above the roller support 6 and leaves the contact above the roller support 5. Thus, the place of contact of the load-carrying the tape 2 with the drive tape 1 is located above the roller support 6.

The drive belt 1 due to the frictional forces on the contact surface transfers the traction force of the load-carrying tape 2. In this case, the tension of the drive tape 1 increases along the length of the contact (in the direction from the roller support 6 to the roller support 5), and the tension of the load-carrying tape 2 decreases along the contact length (in the direction from roller support 6 to roller support 5). The speed of any section of the drive belt 1 is proportional to the magnitude of the tension in this section, so the speed of the drive tape 1 on the roller support 6 (V _P6 ) is less than on the roller support 5 (V _P5 ). Similarly, the speed of the load-carrying tape 2 on the roller support 6 (V _G6 ) is greater than on the roller support 5 (V _G5 ).

The sliding speed of the drive tape 1 relative to the load-carrying tape 2 on the roller support 6 (V _C6 ) is determined by the formula

V _C6 = V _P6 -V _G6 .

Similarly, the sliding speed of the drive tape 1 relative to the load-carrying tape 2 on the roller support 5 (V _C5 ) is determined by the formula

V _C5 = V _P5 -V _G5 .

Since V _P5 > V _P6 , and V _G5 <V _G6 , then V _C5 > V _C6 , that is, the sliding speed of the drive belt 1 relative to the load carrying belt 2 increases along the contact length from the point of contact on the roller support 6 to the point of separation on the roller support 5.

If V _P6 > V _G6 , then the friction forces are directed so that the drive belt 1 pulls the carrying belt 2.

If V _P6 <V _G6 , then the friction forces are directed so that the drive belt 1 brakes the load-carrying tape 2.

The sensors 15 and 16 via cables 17 and 18 transmit to the control unit 12 the values of the speeds of the load-carrying tape 2 and the drive tape 1 in front of the place of their contact. The control unit 12 in accordance with a predetermined mode of operation of the conveyor belt generates a control signal and transmits it via cable 14 to the electric drive, which drives the drive drum 9 with the required rotation speed. For example, in traction mode, control unit 12 provides V _P6 > V _G6 , in braking mode - V _P6 <V _G6 .

The control method of the intermediate drive of the conveyor belt is implemented as follows.

For the movement of the load-carrying belt 2 according to a predetermined mode of operation of the conveyor belt (acceleration, movement at a constant speed, deceleration), the electric drive rotates the drive drum 9 with the required acceleration, speed. To maintain a stationary state of the load-carrying tape 2, the electric drive holds the drive drum 9 in a stationary state using a brake (not shown).

To accelerate the load-carrying tape 2 or to maintain the movement of the load-carrying tape 2 at a constant speed, the drive belt 1 operates in a traction mode. In this case, the control unit 12 transmits to the electric drive a control signal that provides a slight excess of the speed of the drive belt 1 on the roller support 6 with respect to the speed of the load-carrying tape 2 on the roller support 6 V _П6 > V _Г6 .

To reduce wear, the slipping speed of the drive belt 1 relative to the load-carrying tape 2 should not exceed the permissible value Δ. Therefore, the control unit 12, based on the signals of the sensors 15 and 16, generates and transmits to the electric drive via cable 14 a control signal that ensures the movement of the drive tape 1 with a speed within

V _G6 <V _P6 ≤V _G6 + Δ.

The value of Δ depends on the characteristics of the sensors 15 and 16, the control unit 12, the electric drive and should be minimal.

To slow the load-carrying tape 2, the drive belt 1 operates in a braking mode. In this case, the control unit 12 transmits to the electric drive a control signal providing a slight decrease in the speed of the drive belt 1 on the roller support 6 relative to the speed of the load-carrying tape 2 on the roller support 6 V _P6 <V _G6 . To reduce wear, the slipping speed of the drive tape 1 relative to the load-carrying tape 2 should also not exceed the permissible value Δ. Therefore, the control unit 12, based on the signals of the sensors 15 and 16, generates and transmits to the electric drive via cable 14 a control signal that ensures the movement of the drive tape 1 with a speed within

V _G -Δ≤V _P <V _G.

With all modes of operation of the conveyor belt due to uneven loading, oscillatory processes, the speeds of the load-carrying tape 2 and the drive belt 1 are changed randomly. The installation of speed sensors 15 and 16 at the point of contact between the load-carrying tape 2 and the drive belt 1 or in front of it allows the control unit 12 to obtain information about the actual values of the speed of the load-carrying tape 2 and the drive tape 1, generate and transmit a control signal with a minimum delay to the electric drive, and control the speed of movement drive tape 1.

Changing the speed of movement of the drive belt 1 within the specified limits ensures reliable operation of the intermediate drive, reduces power consumption and wear of the tapes, prevents improper operation of the intermediate drive (for example, braking if it is necessary to accelerate the load-carrying tape 2 or traction, if necessary, slow down the load-carrying tape 2).

Information sources

1. Dyachkov V.K. Multi-drive belt conveyors of great length / V.K. Dyachkov. - M.: NIIINFORMTYAZHMASH, 1974.- p.11-12.

2. RF patent No. 2487071, cl. B65G 23/04, publ. 07/10/2013.

3. Spivakovsky A.O. Transporting machines / A.O. Spivakovsky, V.K. Dyachkov. - M.: Mashinostroenie, 1983.- p. 94-97.

Claims (4)

1. The intermediate drive of the conveyor belt, including a closed drive belt located under the load-carrying belt and in contact with it, supported by roller bearings and covering the drive and tension drums, the drive drum electric drive, the drive control unit, characterized in that the intermediate drive of the conveyor belt is equipped with load-bearing speed sensors and drive tapes installed in the place of contact of the load-carrying and drive tapes or in front of the place of contact of the load-carrying and drive tapes. 2. The intermediate drive of the conveyor belt according to claim 1, characterized in that the speed sensor of the load-carrying belt is mounted on a roller support in front of the contact point of the load-carrying and drive belt. 3. The intermediate drive of the conveyor belt according to claim 1, characterized in that the speed sensor of the drive belt is mounted on a roller support at the contact point of the load-carrying and driving belt or on a tension drum. 4. The method of controlling the intermediate drive of the conveyor belt, including changing the speed of the drive belt according to a predetermined mode of operation of the conveyor belt, providing acceleration of the load-carrying belt, the movement of the load-bearing tape at a constant speed, deceleration of the load-bearing tape, the stationary state of the load-bearing tape, characterized in that in the modes of acceleration of the load-bearing the tape and the movement of the load-carrying tape with a constant speed, the speed of the drive tape V _P in the place of contact with the load-bearing tape change within
V _G <V _P ≤V _G + Δ,
where V _G is the speed of the load-carrying tape at the place of contact with the drive tape or in front of it, Δ is the permissible slipping speed of the drive tape relative to the load-carrying tape,
in the mode of deceleration of the load-carrying tape, the speed of the drive tape in the place of contact with the load-carrying tape is changed within
V _G -Δ≤V _P <V _G.

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