JP2004323134A - Conveyor transportation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect transportation amount in a system provided with a conveyor scale CS at an intermediate position to transport scheduled transportation amount accurately. <P>SOLUTION: This conveyor transportation system is provided with a load cell 2 for transporting a transportation object by scheduled transportation amount by conveyors A to E to detect weight at a C conveyor position and a speed detector 3 for detecting transportation speed. A 0 timing detection part S1 detects the approach to the scheduled transportation amount including loading amount of the A, B conveyors on the upstream side. A moving average computing part S2 obtains average transportation amount obtained by computing on a moving average basis transportation amount detected from weight and detection speed. An A, B loading amount computing part S3 predicts loading amount of an upstream side conveyor from average transportation amount, transportation speed, and conveyor length. A remaining operation time computing part S4 obtains a remaining operation time of the conveyor from 0 timing detection time based on a predicted loading amount value. A timer clocking part S5 obtains a stop command of the conveyor after the remaining operation time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a conveyor transport system that connects a plurality of belt conveyors and transports particulates such as cement and coke, and more particularly to a transport amount detection device for transporting a predetermined transport amount.
[0002]
[Prior art]
This type of conveyor transport system is configured, for example, as shown in FIG. The A conveyor to the E conveyor are connected, and the goods taken in at the leading A conveyor position are transported in the order of A → B → C → D → E, and are carried into the destination F from the final E conveyor. The operation / stop control of each of the conveyors A to E is performed by starting the operation in the order of the conveyors E to A, thereby preventing the transported goods from being congested on the conveyors, and detecting the transportation of the conveyors A to E by detecting the transportation of the planned transportation amount. Stopping the operation in order prevents the cargo from remaining on the conveyor.
[0003]
Here, a conveyor scale CS is usually often used for the transport amount detection device (for example, see Patent Document 1 or Patent Document 2). As shown in FIG. 3, the conveyor scale CS detects the weight W (unit: kg) of the conveyed goods whose position is conveyed by the load cell 2 attached to the lower part of the conveyor 1 and engages with the conveyor 1. The speed detector 3 detects the transport speed V (unit: m / s) of the conveyor, and the CS calculation unit 4 calculates the instantaneous transport amount (unit: kg · m / s) by multiplying the two. By the time integration of (1), pulse signals of a number proportional to the transport amount (unit: kg · m) are obtained. For example, one pulse is output when the transport amount reaches 1000 kg · m. When using this conveyor scale CS, a value corresponding to the scheduled transport volume is preset in a counter, the counter is counted down by an output pulse from the conveyor scale CS, and when the value reaches 0, the scheduled transport volume is reduced. A timing signal can be obtained indicating that it has been reached. To control the scheduled transport amount, a conveyor stop command is issued at a timing of the counter of 0.
[0004]
When the speed detector 3 has a pulse pickup configuration, the number of pulses generated is proportional to the transport speed V (unit: number of pulses / second). Then, the CS calculation unit 4 calculates the transport speed V by counting the number of pulses per unit time.
[0005]
[Patent Document 1]
JP-A-10-291632
[Patent Document 2]
JP-A-7-101552
[Problems to be solved by the invention]
In the above-mentioned conveyor transport system, the conveyor scale CS is often not installed at the A conveyor position serving as a starting point. This is the case of a system in which the conveyor scale CS cannot be attached to the A conveyor that is the starting point due to mechanical restrictions of the system. In addition, installing the conveyor scale CS on the E conveyor side at the end point downstream of the transported goods enables accurate detection of the planned transport volume even if "load spill" occurs on an intermediate conveyor such as C conveyor. It may be a system that does it.
[0008]
As described above, in the case of a system in which the conveyor scale CS is attached to the conveyor downstream of the A conveyor that is the starting point, as described above, the counter is counted down by the pulse output from the conveyor scale CS, so that the expected transport amount is reduced. In the method of detecting the arrival, a large deviation from the actual target transport amount occurs.
[0009]
For example, as shown in FIG. 4, when the conveyor scale CS is provided on the C conveyor, if the conveyors CS are stopped in the order of the A conveyor and the E conveyor at the timing when the expected transport amount is detected by the conveyor scale CS, the A conveyor and the B conveyor are stopped. The above-mentioned transported goods are transported to the end point, and in this case, the transport destination F is carried in in excess of the scheduled transport amount.
[0010]
In this case, the expected transport amount PK (unit: kg · m), the constant K1 (unit: kg · m) corresponding to the loading amount of the A conveyor and the B conveyor, and the following calculation in anticipation of this constant K1,
[0011]
(Equation 2)
(PK-K1) -Number of generated pulses of the conveyor scale CS = 0
When the conveyor stop command is generated at the timing 0 when the condition is satisfied, the transport of the scheduled transport amount PK including the loading amounts of the A conveyor and the B conveyor can be performed.
[0012]
However, if the actual loading amounts of the A conveyor and the B conveyor deviate from the constant K1, the planned transport amount becomes insufficient or excessive.
[0013]
SUMMARY OF THE INVENTION An object of the present invention is to provide a conveyor transport system capable of transporting with accurately detecting a transport amount in a system configuration in which a conveyor scale CS is installed at an intermediate position of an articulated conveyor.
[0014]
[Means for Solving the Problems]
The present invention, in order to solve the above-mentioned problems, to detect 0 timing that approached the planned transport volume including the loading capacity of the conveyor on the upstream side of the conveyor on which the conveyor scale is installed, at the time of this detection, the upstream conveyor Is estimated from the average value of the instantaneous transport volume, the transport speed, and the length of the conveyor on the conveyor equipped with the conveyor scale, and based on this predicted value, the remaining operating time of the conveyor required after detecting 0 timing is calculated. A conveyor stop command is obtained after the operation time, or a conveyor stop command is obtained when the remaining operation time 0 is detected, and is characterized by the following configuration.
[0015]
(1) A transported object is transported by a predetermined transport amount by a plurality of connected conveyors, and a load cell for detecting the weight of the transported item at the position on the intermediate conveyor; a speed detector for detecting a transport speed; And a transport volume detection control means for detecting that the transport volume obtained based on the instantaneous transport volume calculated from the detected value of the transport speed has reached the scheduled transport volume and obtaining a conveyor stop command. hand,
The transport amount detection control means,
0 timing detection unit that detects that the transport amount including the load amount of the conveyor on the upstream side of the conveyor on which the load cell and the speed detector are installed approaches the scheduled transport amount,
At the time of detection of the 0 timing, a loading amount calculation unit that predicts the loading amount of the upstream conveyor from the instantaneous transport amount and the conveyor length,
A remaining operation time calculation unit for obtaining a remaining operation time of the conveyor from the time of the detection of the 0 timing based on the estimated load amount of the upstream conveyor,
A timer counting unit for obtaining a conveyor stop command after the remaining operation time from the detection of the zero timing.
[0016]
(2) A transported object is transported by a predetermined transport amount by a plurality of connected conveyors, and a load cell for detecting the weight of the transported item at the position on the intermediate conveyor; a speed detector for detecting a transport speed; And a transport volume detection control means for detecting that the transport volume obtained based on the instantaneous transport volume calculated from the detected value of the transport speed has reached the scheduled transport volume and obtaining a conveyor stop command. hand,
The transport amount detection control means,
0 timing detection unit that detects that the transport amount including the load amount of the conveyor on the upstream side of the conveyor on which the load cell and the speed detector are installed approaches the scheduled transport amount,
A loading amount calculation unit that predicts the loading amount of the upstream conveyor from the instantaneous transport amount and the conveyor length,
After the detection of the 0 time, repeated predictions loading amount by the loading amount calculating unit, the estimated time t _1, t 2, _..., the following equation for each t _N,
[0017]
[Equation 3]
K−Q _N −ΔQ = 0
However,
K is a loading constant of the upstream conveyor which is set when 0 timing is detected,
Q _N is loading amount prediction value determined respectively by the prediction time _t 1 ~t _N,
ΣQ is the total value of the transport amounts obtained at the predicted times t _{1 to} t _N ,
And an arithmetic means for obtaining a conveyor stop command when the arithmetic expression is satisfied.
[0018]
(3) The 0-timing detection unit calculates a value obtained by subtracting a constant K1 set as the load of the upstream conveyor and a load margin constant K2 as a positive / negative error of the constant K1 from the expected transport PK. It is characterized in that the zero timing is detected when the transport amount obtained from the transport speed and the instantaneous transport amount has been reached.
[0019]
(4) A moving average calculation unit is provided, in which the average transportation amount obtained by performing a moving average operation on the instantaneous transportation amount obtained from the weight and the transportation speed is used as the instantaneous transportation amount in the load operation unit.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram of a transport amount detection control device according to an embodiment of the present invention. The conveyor transportation system is a case of a conveyor transportation system in which A to E conveyors are connected and transport a transported object to a destination F by a predetermined amount, and a conveyor scale CS is installed at a C conveyor position, as in FIG.
[0021]
In the conveyor scale CS, as in the conventional case, the load cell 2 detects the weight W (unit: kg) of the conveyed object at the position, and the speed detector 3 detects the conveyor speed V (unit: m / s). Is detected as the number of pulses per unit time. The CS calculation unit 4 integrates the instantaneous transport amount (unit: kg · m / s) obtained from the product of the weight and the speed to obtain pulse signals of a number proportional to the transport amount (unit: kg · m). For example, one pulse is generated every time the transport amount reaches 1000 kg · m.
[0022]
The transport volume detection control device 5 detects the timing at which the planned transport volume can be transported by the following sequence processing means S1 to S5 which is configured by software, and issues a conveyor stop command upon this detection.
[0023]
After the start of transportation, the 0 timing detection unit S1 calculates a planned transportation amount PK (unit: kg · m), a constant K1 (unit: kg · m) to be predicted and set as a loading amount of the A conveyor and the B conveyor, and furthermore, a loading margin. Using the constant K2 (unit: kg · m), 0 timing is obtained by the following subtraction formula.
[0024]
(Equation 4)
(PK−K1−K2) −Number of generated pulses of CS operation unit = 0
At this 0 timing, it is detected that the transport volume up to the present has reached near the scheduled transport volume PK by including the payload margin constant K2 in addition to the payload constant K1 of the A conveyor and the B conveyor.
[0025]
Here, if the conveyor operation is stopped at zero timing, the difference (positive or negative) between the actual load amount on the A and B conveyors and the constant K1 causes shortage or excess of the transport amount. In order to correct the difference in either case of the shortage or the excess, zero timing including the load margin constant K2 is detected.
[0026]
The moving average calculation unit S2 calculates the instantaneous transport amount (unit: kg · m / s) from the weight detected by the load cell 2 and the transport speed detected by the speed detector 3, executes the moving average calculation, and calculates The average transport amount Q (kg · m / s) at the time of detecting the timing is obtained. The average transport quantity Q is the average transport quantity of the transported articles loaded on the C conveyor, but also the predicted average transport quantity of the transported articles loaded on the A and B conveyors. Note that the moving average calculation is a repetition of sampling the value of the instantaneous transport amount to be obtained at a constant cycle, and dividing the sample value from the present to N samples in the past by N.
[0027]
A, B loading calculation unit S3 is the average transport volume Q and A, Captain L _A and B the _conveyor, from L B (pulse count of the pulse pick-up 3 per unit time) _(default) and conveyor transport speed V , a at 0 timing detected by the following equation, loading amount prediction value _Q a and B conveyors, _{Q B} (unit: kg · m) is determined.
[0028]
(Equation 5)
Q _A = Q × L _A / V
_{Q B = Q × L B /} V
Note that the exact loading amount calculation, C conveyor scale loading amount on C conveyor with captain L _C of CS to the position _{Q C (= Q × L C} / V) of the conveyor is also preferably included.
[0029]
The remaining operating time calculation unit S4 is 0 and constant K1, K2 subjected to detection of the timing detection unit S1, A, loading amount prediction value Q _A and B _conveyors, it obtains a difference between the Q _B, the average transport volume Q of this Then, the remaining operation time T (unit: second) until the conveyor stop control is obtained by dividing by.
[0030]
(Equation 6)
_{T = ((K1 + K2)} - (Q A + Q B)) / Q
The timer counting unit S5 issues a conveyor stop command when the time T has been reached by a timer process in which the remaining operation time T is set.
[0031]
Therefore, the conveyor stop command is issued after T time from the detection timing of the 0 timing detection unit S1, and the conveyor stop control that accurately detects the loading of the A and B conveyors and eliminates the shortage / excess of the transport amount can be performed.
[0032]
In the embodiment, the case where the moving average calculation is performed only once at the time of detecting the 0 timing to obtain the average transport amount Q and the remaining operation time T is calculated based on the moving average calculation Q is shown. At each time t ₁ , t ₂ ,..., T _N
[0033]
(Equation 7)
K−Q _N −ΔQ = 0
However,
_{K = (K1 + K2),} Q N = (Q AN + Q BN)
ΣQ is the total value of the transport amounts Q _{1 to} Q _N obtained at times t _{1 to} t _N ,
Q _AN and Q _BN are the estimated load values of the A and B conveyors obtained at times t _{1 to} t _N , respectively.
Is repeated, and a conveyor stop command can be obtained when this equation is satisfied. In this case, even when the loading amounts of the A and B conveyors change depending on the position of the conveyors, high-accuracy transportation in which these changes are corrected can be performed.
[0034]
In the embodiment, the case where the conveyor scale CS is installed on the C conveyor is shown. However, the same operation can be performed when the conveyor scale CS is installed on the B conveyor, the D conveyor, or the E conveyor.
[0035]
【The invention's effect】
As described above, according to the present invention, 0 timing is detected as approaching the scheduled transport volume including the loaded volume of the conveyor on the upstream side of the conveyor on which the conveyor scale is installed, and the loading of the upstream conveyor is detected at this detection. The amount is predicted from the average value of the instantaneous transport volume, the transport speed, and the length of the conveyor on the conveyor equipped with a conveyor scale. Since the conveyor stop command is obtained later or the conveyor stop command is obtained when the remaining operation time 0 is detected, the transport amount in the system in which the conveyor scale CS is installed at the intermediate position is accurately detected, and the scheduled transport is performed. The quantity can be transported accurately.
[0036]
Note that the processing function of a normal sequencer can be used as the CS operation element, and can be easily realized without using any special control means. In addition, the present invention can be applied to a case where a device such as a damper is included in the middle of the connecting conveyor.
[Brief description of the drawings]
FIG. 1 is a block diagram of a transport amount detection control device according to an embodiment of the present invention.
FIG. 2 shows an example of a conveyor transportation system.
FIG. 3 shows an example of a conveyor scale CS.
FIG. 4 is an example in which a conveyor scale CS is provided on an intermediate conveyor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Conveyor 2 ... Load cell 3 ... Speed detector 4 ... CS operation part 5 ... Transportation amount detection control device A-E ... Conveyor CS ... Conveyer scale

Claims (4)

A load is transported by a plurality of linked conveyors by a predetermined transport amount, and the intermediate conveyor detects a weight of the transported material at the position, a load cell that detects a transport speed, a speed detector that detects a transport speed, and the weight and transport speed. A conveyor transport system comprising transport amount detection control means for detecting that the transport amount obtained based on the instantaneous transport amount calculated from the detected value has reached the scheduled transport amount and obtaining a conveyor stop command,
The transport amount detection control means,
0 timing detection unit that detects that the transport amount including the load amount of the conveyor on the upstream side of the conveyor on which the load cell and the speed detector are installed approaches the scheduled transport amount,
At the time of detection of the 0 timing, a loading amount calculation unit that predicts the loading amount of the upstream conveyor from the instantaneous transport amount and the conveyor length,
A remaining operation time calculation unit for obtaining a remaining operation time of the conveyor from the time of the detection of the 0 timing based on the estimated load amount of the upstream conveyor,
A conveyor timer for obtaining a conveyor stop command after the remaining operation time from the detection of the zero timing. A load is transported by a plurality of linked conveyors by a predetermined transport amount, and the intermediate conveyor detects a weight of the transported material at the position, a load cell that detects a transport speed, a speed detector that detects a transport speed, and the weight and transport speed. A conveyor transport system comprising transport amount detection control means for detecting that the transport amount obtained based on the instantaneous transport amount calculated from the detected value has reached the scheduled transport amount and obtaining a conveyor stop command,
The transport amount detection control means,
0 timing detection unit that detects that the transport amount including the load amount of the conveyor on the upstream side of the conveyor on which the load cell and the speed detector are installed approaches the scheduled transport amount,
A loading amount calculation unit that predicts the loading amount of the upstream conveyor from the instantaneous transport amount and the conveyor length,
After the detection of the 0 time, repeated predictions loading amount by the loading amount calculating unit, the estimated time t _1, t 2, _..., the following equation for each t _N,

However,
K is a loading constant of the upstream conveyor which is set when 0 timing is detected,
Q _N is loading amount prediction value determined respectively by the prediction time _t 1 ~t _N,
ΣQ is the total value of the transport amounts obtained at the predicted times t _{1 to} t _N ,
And a calculation means for obtaining a conveyor stop command when the calculation formula is satisfied. The 0-timing detection unit calculates a value obtained by subtracting a constant K1 set as the load of the upstream conveyor and a load margin constant K2 as a positive / negative error component of the constant K1 from the planned transport PK. The conveyor transportation system according to claim 1 or 2, wherein when the transportation amount obtained from the instantaneous transportation amount is reached, zero timing is detected. 4. The moving average calculator according to claim 1, further comprising a moving average calculator configured to set an average transport amount obtained by performing a moving average calculation on the instantaneous transport amount obtained from the weight and the transport speed as an instantaneous transport amount in the load calculator. The conveyor transport system according to claim 1 or 2.

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