JPH01214513A - Constant transportation controller for carrying conveyor - Google Patents

Abstract

PURPOSE:To improve the efficiency of carriage combining a plurality of throw-in conveyors and collecting conveyors by measuring the weight for every set distance and obtaining the speed of throw-in conveyor based on the weight immediately before carrying out, the number of throw-in conveyors and the set value of transportation of the collecting conveyor, thereafter controlling a variable speed motor based on the speed of the throw-in conveyor. CONSTITUTION:Every movement of a throw-in conveyor A by e preset distance is measured through a belt scale E and stored in a shift memory 5. The shift memory 5 is updated sequentially. An operating board O sets the transporting amount Ws of collecting conveyor. Ws/K.Wn is calculated based on the set value Ws, number of operating throw-in conveyors K and final stage measurement Wn of the shift memory 5, and a speed set value Vs of the throw-in conveyor is calculated. A speed command is provided from a PI regulating section 11 based on the difference between the set value Vs and a detected value Vphi of belt speed in order to control the rotation of a variable speed motor IM. By such arrangement, processing efficiency can be improved.

Description

[Detailed description of the invention] 8. Industrial application field The present invention is used for a conveyance facility that combines a plurality of input conveyors and collection conveyors to convey goods to a common place, and is capable of constant control of the amount of conveyance Z. Fixed conveyor trunk feeding rate FI1
B1 Overview of the Invention The present invention relates to a collection conveyor and a plurality of input conveyors yxM.
In the combined conveyor, a variable speed electric motor is used as the drive motor of each input conveyor, while each input conveyor v
7- Measuring the weight of the song 1. Use the belt scale and belt speed detector to obtain at least the weight measurement value before conveyance and bleeding, and calculate the value on the weight scale side, the number of operating input conveyors, and the transport amount of the collection conveyor. By calculating the speed setting value of the input conveyor from the set value and controlling the rotation speed of the variable speed motor using the speed command based on this value, the transport N of the collection conveyor can be adjusted regardless of the loading capacity of each input conveyor and the number of operating units. is maintained at a set value to prevent damage to the belt conveyor due to exceeding the rating.

C0 Conventional technology When collecting and transporting loads brought in from multiple locations,
For example, as shown in FIGS. 4 and 5, ~An? Installed one end of Kv person Homper B,
~ Bnn is arranged, and a collecting conveyor C is installed at the other end.

In this way, the installation hopper B, -Bnvc input δ
The loaded loads fall onto input conveyors A1 to A and are conveyed, and at the other end are transferred to collection conveyor C and conveyed to a predetermined location.

D1 Problem to be Solved by the Invention When such a configuration is adopted, the conveyance amount of input conveyors 81 to 8n is not constant, and the number of operating units thereof also varies, so that the conveyance capacity, that is, the conveyance of collecting conveyor C The amount of VC fluctuates greatly, and there are cases where the conveyance resistance is rated at 50%, which may cause damage to the belt conveyor.
cause In addition, since the conveyors after the collection conveyor also take over the load regardless of the load, there are disadvantages such as poor processing efficiency and excessive investment as it requires the purchase of equipment suitable for the maximum load.

E6 assignment? Means for Solving the Problem The present invention combines a collection conveyor and a plurality of input conveyors, and uses the input conveyor to collect loads on the collection conveyor and transport them to a predetermined hot water area. While a variable speed electric machine is used as the motive force, a belt scale and belt speed detector are installed on each input conveyor to measure the weight of the load, and the weight measurement value Z is measured every set distance traveled.
It is stored in the shift memory, and the weight measurement value wn just before unloading, the number of operating input conveyors, the transport volume setting value W8 of the collection conveyor, and the value used by Kaoru g! Operation N of ws/ to -wn in the arithmetic section
:V and retrieve the speed setting value of the input conveyor, and control the rotation speed of the variable speed motor 1I1 with the speed command based on this.
This is characterized by the fact that 1) is performed.

F2 action The amount M of the load on the input conveyor is measured by the belt scale every time it moves a set distance t, and is recorded in the shift memory tV. The measured value immediately before unloading from among the stored values is inputted to the calculation section along with the transportation volume setting value of the collecting conveyor and the number of operating input conveyors, where the speed setting value of the input conveyor is calculated. A speed command is generated based on this calculation result,
The rotation speed of the variable speed electric motor is controlled so that the conveyance amount of the collection conveyor becomes the set value. As a result, the transport amount of the collecting conveyor is uniformly distributed regardless of the loading amount of the input conveyor and the number of operating conveyors.

Is the following example the present invention? This will be explained in detail based on the illustrated embodiment. FIGS. The speed of the input conveyor is controlled so that the amount transported by the collection conveyor is constant, and the input conveyor is equipped with a belt scale E for weight measurement and a pulse pickup (rotational speed) for measuring the travel distance. Total) Fvii. Input conveyor A C) A variable speed electric motor (induction motor) G is used as the drive motor.
Variable speed control is performed by a VVF (variable voltage variable frequency) power supply HVC. The belt scale E is installed at a distance from the end of the conveyor.

The above ■■■F device HVC is provided by a constant transport amount control device I and a speed finger 8 and a servo setting device J. , 1l
The control panel O is attached to the jlJ elevation equipment engineer. The servo foot control device J is for switching between automatic and manual mode.The transport 17:-The foot control device converts the transport amount set value from the operation panel O into a signal W8 for calculation processing. Engineering N (binary loader) 15 Weight signal from the belt scale E'! a<A, /D (analog-digital) i# A/Df converter 2, pulse counter 3 that counts the speed signal from the pulse big angle. P/IJ” converter 4 that converts the speed signal into a variable signal (numerical value)
, shift memory 5 which stores the A/D converted military quantity number by the measurement correlation from the counter 3, adder 6 to calculate the number of operating units K to the input conveyor, setting signal W8, number of operating units K,
-W to Ws/ by inputting the stored value Wn of the shift memory 5
a calculation unit 7 that performs calculations; a multiplier 8 that multiplies the belt speed vp (output of the P/D converter 4) by the stored value Wn; vp-
BOD5.WnF<input and send this to operation panel O as the current value of payout bonds per input conveyor. Arithmetic unit 7
A limiter 10 provided at the rear stage, a PI adjustment section 11 that takes the difference between the set value and the detected value and sets it as a speed command for the VVVF device H.
It is composed of:

Next, the operation will be described. A preset distance (
Every time the input conveyor 8 moves by L/n), the weight is measured on the belt scale E. B, shift memory 5 after A/v conversion
Enter. The shift memo IJ 51c stores n measurement values, and each time a new measurement (V is input, the measurement value shifts).In the case of storage, the oldest total 6
111 value is reset with new input. The moving distance to the input conveyor is measured by the number of pulse counts, and the set distance is determined by the number of negative pulses. An example of this measurement is shown in Figure 3. The larger the number of sections n, the more it corresponds to the actual weight distribution on the input conveyor A.

On the other hand, by operating the 5-operation panel 0, the conveyance amount (ton
/h') is generated and is input to the calculation unit 7 together with the number of input conveyors in operation K and the measured value of the last stage of the shift memory 5 (the value immediately before being carried out to the collection conveyor) Wn (ton/m).
Here.

The calculation of v s := W s / K 1W n is performed and the speed setting value vs to the input conveyor cannot be calculated.

Based on this setting (i (i, v) and the deviation between s and the belt speed detection value vp, a speed command is output from the PIllfi joint 1. The rotational speed of the electric motor G is controlled so that the speed to the conveyor becomes the set value vB, and the transport volume of the collection conveyor is maintained at the set value Ws. Adjust the moving speed of the input conveyor so that the group conveyed by the collection conveyor is constant.
? Since the instantaneous transport volume of the collecting conveyor does not exceed the rated value, the causes of damage to the belt conveyor can be eliminated.Furthermore, the loads on the conveyors after the collecting conveyor are uniform, and the transport volume can be reduced. Since it is also optional, processing efficiency and equipment efficiency can be improved. Further, since the speed of each input conveyor is controlled individually, the input conveyor discharge females during the five operations can be controlled in the same way regardless of the loading amount.

Therefore, there is no imbalance in the amount of output from each input conveyor. Furthermore, even when the ends of belt-scaled input conveyors are far apart, the speed control of each input conveyor can be accurately controlled based on the transport volume at the end of the conveyor.

[Brief explanation of the drawing]

FIG. 1 shows transport i - constant i1 of the conveyor according to the present invention.
] A block diagram showing Embodiment 7 of the L control device, FIG. 21 is an explanatory diagram of the belt scale for measuring the amount of waste in the same embodiment, and FIG. The weight distribution diagram, FIGS. 4 and 5 are explanatory diagrams of the configuration of a conveyance facility that combines a collection conveyor and a plurality of input conveyors. A... Input conveyor, C... Collection conveyor, D
...Cargo, E"' 34c Kuiyi' Held scale for Wll, F...Pulse pickup, G...Variable speed electric motor for driving input conveyor. H...VVVF packaging 5■...Transportation amount Constant control device. 0... Operation panel, 3... Pulse counter, 5... Shift memory, 7... Performance m, 11... PI adjustment section. Y → 5th section to 9th direction

Claims (1)

[Claims] (1) In a transport conveyor that combines a collection conveyor and multiple input conveyors, and uses the input conveyor to collect loads on the collection conveyor and transport them to a predetermined location, a variable speed electric motor is used as the drive motor for each input conveyor. On the other hand, each input conveyor is equipped with a belt scale and a belt speed detector to measure the weight of the load, and the weight measurement value for each set distance movement is stored in the shift memory, and the weight measurement value Wn immediately before unloading is used to operate the input conveyor. Using the number K and the conveyance volume set value Ws of the collection conveyor, the calculation unit calculates Ws/K・Wn to calculate the speed set value of the input conveyor, and the speed command based on this calculates the rotation speed of the variable speed motor. A constant transport amount control device for a transport conveyor, characterized in that it performs control.