JPH0218676B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a system for transporting and recycling powder and granules, and even if the particles are consumed in irregular amounts, the total amount of powder and granules present in the system can be calculated. The present invention relates to a control method for keeping the flux substantially constant at all times, and particularly relates to a method for circulating welding flux.

(Prior art) Generally, a part of the transported powder and granular material is consumed at the destination, and the unconsumed powder and granular material is collected and returned to the transportation source before being transported and recycled again. , a hopper tank is provided at the transport destination of the powder supply and transportation device, the powder and granules are consumed near the outlet of the hopper tank, and the remaining amount is collected, transported, and collected in the collection collection hopper, and the supply and transportation device Circulates the powder and granules. As this cyclical use is repeated, the amount of powder and granules in the circulatory system naturally decreases. Powder and granules must be replenished into the circulatory system. At this time, unless the replenishment amount corresponds equally to the consumption amount, the total amount of powder and granular material in the circulation system will gradually decrease or increase. especially,
If the supply capacity decreases, there is a risk that the supply capacity will be insufficient and operations will be disrupted, so it is often necessary to replenish the amount in excess of the predicted consumption. In many cases, the equipment is sufficiently large.

Here, as an example of the above-mentioned conventional powder transportation/circulation system, a flux circulation/use system in submerged welding will be described as an example. Fourth
The figure shows a conventionally known simple flux circulation device, in which flux is introduced from an input port 1 into a hopper section 3 in the circulation system, and is spread onto a workpiece 101 via a supply section 4 for welding. The machine 102 performs welding. A part of the flux that was previously spread during welding is consumed and becomes slag 103, and the remaining flux 104 is transferred to the collection path 5 by the suction force of the suction blower 2.
The flux is recycled and used by returning to the hopper section 3 via the hopper section 3 and being sprayed again. Incidentally, during welding, some of the flux within the circulation system is consumed and reduced to slag, and the inside of the hopper gradually becomes empty. Therefore, a level switch 6 is provided at the bottom of the hopper section, and when the level falls below this level, an alarm is issued and flux is replenished from outside the circulation system. In other words, in the circulation system, the amount of flux in the circulation system is replenished once based on the installed level of the level switch, but replenishment is only performed when the blower is not collecting flux.

FIG. 5 shows another conventional example, in which flux is supplied to multiple (four locations in FIG. 5) welding lines,
This is an example of a flux transport circulation system that collects flux that is not consumed during welding, performs necessary processing, and resupplies it. That is, the flux is transported from the blow tank 9 of the supply transport device to the hopper tanks 16 to 19 of each welding line via the supply path 10, and the flux that has not been consumed as slag in each welding line is recovered by the recovery machine 20. It is transported from the blow tank 21 of the recovery transport device to the hopper tank 23 via the recovery path 22, subjected to necessary processing such as magnetic separation and sieving in the processing device 24, and stored in the recovery collection hopper 7, and then returned to the blow tank 9. This is a flux recycling system in which the flux is transported to the welding line. In addition, hopper tank 8
is a service tank for replenishing flux.

In this circulation system, the welding lines 16 to
Although the consumption amount in step 19 is not necessarily a constant amount, the average consumption amount is predicted and the predicted amount of flux is quantitatively supplied from the replenishment unit 105 via the hopper tank 8, collected in the blow tank 9, and the circulation system It is replenished inside. However, if circulation is repeated under conditions where the actual consumption amount and replenishment amount are not equal, the total amount of flux in the circulation system may gradually decrease or increase.
6 to 19, and 23 must be installed with a large capacity so that an amount two to three times the minimum necessary and sufficient total amount can be held in the circulation system.

In this way, conventional systems for transporting and cycling powder and granules do not have a means to detect the total amount currently in the circulation system, and the amount of powder and granules consumed is not necessarily constant (irregular). consumption),
The following inconveniences and problems arose.

(Problems to be Solved by the Invention) First, it is not possible to quantitatively determine the amount of replenishment that corresponds to the irregular consumption and decrease of powder and granular material during cyclic use, and even if it were determined, It is extremely difficult to perfectly match the consumption and replenishment amounts, so as the circulation is repeated over and over again, the difference between the actual consumption and replenishment amounts causes the circulatory system to The total amount gradually increases or decreases, and if it increases, it will overflow in the circulation system, and if it decreases, it will lead to a situation where the powder or granules in the circulation system will be exhausted. In order to avoid such a situation, the entire circulation system equipment, especially the hopper tanks, must be installed with a large capacity, which requires excessive equipment space and expensive equipment costs.

Alternatively, as another example, all individual hopper tanks in the circulation system are equipped with level meters, measuring instruments, etc.
An extremely complicated and expensive control method had to be used, such as summing these amounts in a timely manner and adjusting the replenishment amount each time based on the increase or decrease in the total amount in the circulatory system.

Due to these problems, in this type of system,
There has been a need for a method to quickly determine the increase/decrease state of the total amount of powder and granules in the circulation system during cyclic use and to control the total amount.

Therefore, the object of the present invention is to provide a method for maintaining the total amount in the circulatory system at an appropriate amount, without too much or too little, even when a non-quantitative amount is consumed in the particulate matter circulatory system, and for which the necessary minimum amount of equipment is required. It is about providing.

(Means for Solving the Problems) That is, the present invention provides a method for circulating welding flux using a circulation path consisting of continuous steps of supplying, using, collecting, replenishing, mixing, and supplying welding flux. The usage process consists of multiple processes installed in parallel, and a flux level meter is installed in the hopper tank of each usage process and recovery process, and the flux replenishment amount in the replenishment process is measured above and below the average consumption amount of all usage processes as a reference. Two corresponding predetermined levels of large input and small input are determined, and the level meter detects the remaining amount of flux in the hopper tank for each usage process.Based on the detected value, the remaining amount of flux in the hopper tank for each usage process is determined. The flux replenishment amount is determined to be large or small depending on the amount remaining in the hopper tank in the recovery process, and based on the result. This is a method for circulating welding flux, which is characterized by replenishing flux and repeating this process, and after determining the two levels of large input and small input, the amount of flux transported is (1 + C / 100).・If the formula of A・N _A B・N _B is satisfied, add a large amount of flux,
If the results are not satisfied, a small amount of flux is added and this process is repeated, which is a method for circulating welding flux. However, C is the average consumption percentage of all usage processes, A is the amount of supplied flux transported in kg/time, and B is the amount of recovered flux transported in kg/time.
times, N _A is the number of times of supply per unit time, and N _B is the number of times of collection per unit time.

Embodiments of the present invention will be explained below using figures.

FIG. 1 is a system diagram of a flux transportation circulation system in an embodiment of the present invention in a welding line.
Reference numeral 31 designates a blow tank of a supply transport device equipped with a measuring device 31' (weighing scale) and having a mixing function, which receives circulating flux from the collection and collection hopper tank 25 and replenishment flux from the hopper tank 26.
The circulating flux and the supplementary flux are mixed and transported to five hopper tanks 37 to 41 of the welding line via the transport pipe 32 of the supply path. At this time, they are not transported to the hopper tanks 37 to 41 at the same time, but are transported one hopper tank at a time by directing the transport destination using the three-way branch valves 33 to 36. The hopper tanks 37 to 41 each have a capacity for transporting two items from the blow tank 31, and the level gauges 42 to 41 are located approximately in the center.
46, which has a capacity to accept one-time transport from the blow tank 31 if the level meter does not detect flux. 47 is a suction type flux recovery machine that recovers flux that has not been consumed as slag in welding lines A to E; 48
1 is a batch-type blow tank of a recovery transport device that receives flux from a recovery machine 47 and transports it to a recovery hopper tank 49 via a recovery path 51. 5
0 is a processing device that separates and discards magnetic substances and slag mixed in welding lines A to E, 25 is a level meter 52
26 is a service tank for replenishment flux. Note that 25' and 26' are automatic valves that are linked to a measuring device 31'.

(Example) In this example, total amount control of the circulation system is performed as shown in the flowchart of FIG. 2, and this will be specifically explained in conjunction with FIG. 1.

First, the amount of replenishment flux to be added is set to 2 levels (up and down) using a measurement setting device connected to the measurement device 31' provided on the operation panel.
and the addition amount of the replenishment flux input amount and the circulating flux input amount. Here, as mentioned above, the input amount of supplementary flux is set at an amount larger than the average consumption amount and an amount smaller than this within the range of variation in consumption amount in the welding line, but in the example, a larger amount is set. One point was set each on the side and the small amount side. That is, the set amount of replenishment flux is set at a value above or below the average consumption amount in the welding line estimated in advance, taking into consideration the dispersion thereof. (Hereinafter, the upper setting value will be referred to as "large injection" and the lower setting value will be referred to as "small injection.") For example, blow tank 3
Assuming that the average consumption on the welding line is 30Kg and the variation is 20% for the 300Kg transported per time in 1, the consumption will be 30Kg + 30Kg x 20/100 = 36Kg for a large amount, and 30Kg - for a small amount. Assuming 30Kg x 20/100 = 24Kg, set the "large input" amount to 36Kg and the "small input" amount to 24Kg. Naturally, the added amount of circulating flux and supplementary flux input is set to 300 kg. Note that three of the five hopper tanks are set as the reference number, and when the total amount control function starts in Figure 2, the level of the hopper tanks 37 to 41 in the process of use is It is determined whether 3 or more (60% or more) of the 42 to 46 in total are detecting flux, and if 3 or more are detected, it is determined that the total amount of flux in the circulatory system is on an increasing trend, Replenishment flux is added in a "small amount" manner. On the other hand, if there are 2 or less, it is further determined whether the level meter 52 of the hopper tank 25 is detected, and if it is detected, it is determined that the total amount of flux in the circulation system is increasing, and a "small injection" is performed, and the detection is performed. If not, it is judged that there is a decreasing trend and a "large investment" is made.

Here, another embodiment of the present invention will be explained with reference to FIG. 3. Similar to FIG. The consumption amount is C%, the blow tank 31 on the supply side transports AKg in one flux transport, and the blow tank 48 on the recovery side transports B kg in one transport.
Kg is transported, and the number of times the two blow tanks transport in 60 minutes is compared. In other words, if the supply side blow tank 31 is N _A times/Hr and the recovery blow tank is N _B times/Hr, and (1+C/100) A・N _A > B・ N _B , the total amount of flux in the circulation system increases. If (1+C/100)A・N _A ≦B・N _B , then it is judged that there is a decreasing trend, and in the former case, a “small input” is made, and in the latter case, a “large input” is performed. .

When the supply of replenishment flux is completed, a set amount of circulating flux is supplied, the circulating flux and the supplementary flux are mixed, and a destination is selected for transportation. In this way, in this embodiment, the increase/decrease situation of the total amount of flux in the circulation system can be monitored by the blow tank 31.
It was possible to control the total amount of flux in the circulation system by making a judgment every time the replenishment flux was added to the welding line, and by controlling the replenishment amount to respond to unsteady consumption in the welding line.

In addition, in the embodiment of the present invention, the hopper tank 5
We have described the case where 3 of these are used as the setting standard number, but the setting standard number is the amount of feed per time to the hopper tank (transport capacity), the hopper tank 37~
It is determined by the installed capacity of the level meters 42 to 46 provided in the hopper tank 41, the capacity of the hopper tank, etc. Next, let the number of hopper tanks be N, and N
Case 2 will be described.

Amount of powder discharged from each hopper tank:
Q [/sec] Amount of powder and granular material discharged per time from the supply blow tank: G [/time] Time for discharging powder and granular material per time from the supply blow tank: T [sec/time] Once the supply to one hopper tank is completed, even if the powder is supplied to the remaining hopper tanks, the powder must remain in the first hopper tank, so the relational expression of GQT(N-1) is To establish.

Also, set the capacity of the level meter of the hopper tank to V.
[ ], if all hopper tanks turn off their level meters at the same time, in order to supply each hopper tank sequentially and before the last hopper becomes empty, similarly, V(N-1 ) must be QT.

In a powder circulation system, minimizing the total amount of the entire system can reduce the capacity of each device such as a hopper tank, which is advantageous in terms of equipment costs and equipment space, so the minimum total amount of control is This is the total amount supplied to all hopper tanks once each, and is NG []
It is expressed as Therefore, the set number of units to be controlled for each hopper tank may be a natural number exceeding the total control amount divided by the maximum capacity of the hopper tank, or the number of units plus 1, that is, the absolute value of NG/G+V + 1.

It is sufficient to satisfy the above relational expression,
For example, 2 out of 5 hopper tanks, or 4
Even if the set standard number of units to be controlled is satisfied, good total amount control can be performed if the above relational expression is satisfied. In addition, the recovery collection hopper 25, where the level meter that is involved in the replenishment control amount is installed, may be placed anywhere other than the supply hopper tank in the circulation system, but it is best to place it immediately before the replenishment hopper tank for better controllability. desirable.

Next, an example of actual total flux control using the method of the present invention will be verified.

Example of setting control values ●Number of hopper tanks N=5 ●Blow tank powder/granular material discharge amount G=200/times, (12 minutes/times) ●Average powder/granule consumption of one hopper tank Q=200/ Hr ●Setting the level meter of the hopper tank Assuming V=200, () Verification of powder discharge time of the blow tank T=12-60=720sec/times TG/Q(N-1)=200/times/200 /Hr×(
5-1) =900sec>720sec (appropriate) () Hopper tank level meter setting VQT (N-1) = 200/Hr×720sec/
times × (5-1) = 160 < 200 (25% margin, appropriate) () Number of hopper tanks to control 5G/G+V = 5 × 200/200 + 200 = 2.5 In other words, the amount of powder and granular material supplied to the hopper tank is adjusted. The power number is 2+1=3.

Therefore, if 3 or more level meters detect flux, replenishment flux should be added in a "small amount", and if 2 or less, the hopper tank 25 should be added.
If the level meter detects it, a ``small injection'' is performed, and if it is not detected, a ``large injection'' is performed.

(Effects of the Invention) As explained above, in the system to which the total amount control method of the circulation system of the present invention is applied, the total amount of powder and granules can be kept approximately constant at an appropriate amount at all times. This method eliminates the need for additional welding flux, has the effect of significantly reducing the inventory of existing powder and granular material, and provides a new method for recycling welding flux.

[Brief explanation of drawings]

Fig. 1 is a system diagram of the welding flux circulation usage method of the present invention, Figs. 2 and 3 are flowcharts of the total flux control of the present invention, and Fig. 4 is a flowchart of the conventional welding flux circulation device. Genealogical diagram, No. 5
The figure is a system diagram of a conventional welding flux transport and circulation system having a plurality of hopper tanks. 1...Inlet, 2...Blower, 3...Hopper part,
4... Supply section, 5, 22, 51... Recovery path, 6, 42
~46,52,106...Level meter, 7,25...Collection collection hopper, 8,26...Replenishment flux hopper tank, 9,21,31,48...Blow tank, 10,32...Supply path, 16-19 , 37-4
1... Hopper tank, 20, 47... Flux recovery machine, 31'... Measuring device, 13-15, 33-36
... Branch valve, 23, 49 ... Recovery hopper tank, 2
4, 50... Processing equipment, -, A to E... Welding line.

Claims (1)

[Claims] 1. A method for circulating welding flux using a circulation route consisting of a continuous process of supplying, using, recovering, replenishing, mixing, and supplying welding flux, wherein the use process consists of a plurality of processes installed in parallel. A flux level meter is installed in the hopper tank of each usage process and recovery process, and the flux replenishment amount in the replenishment process is set at a predetermined large input and small input corresponding to the above and below the average consumption of all usage processes. The amount of flux remaining in the hopper tank of each usage process is determined by the level meter, and based on the detected value, a large amount of flux is added depending on the remaining amount of the hopper tank of each usage process. Alternatively, decide whether to make a small injection, or decide whether to make a large injection or a small injection of flux depending on the remaining amount in the hopper tank in the recovery process, replenish the flux based on the result, and repeat this process. A method for circulating welding flux characterized by: 2. In a method for circulating welding flux that uses a circulation path consisting of a continuous process of supplying, using, collecting, replenishing, mixing, and supplying welding flux, the use process consists of multiple processes installed in parallel, and the replenishment process As the flux replenishment amount, two levels of predetermined large input and small input are determined based on the average consumption amount of all usage processes, and if the following formula indicating the flux transportation amount is satisfied, the flux replenishment amount is determined. A method of circulating welding flux characterized by adding a large amount of flux, and if not satisfied, adding a small amount of flux, and repeating this process. (1+C/100) A・N _A B・N _B However, C is the average consumption % of all usage processes, A is the supply flux transportation amount Kg/time, B is the recovered flux transportation amount Kg/time, N _A is the unit Number of feeds per hour,
N _B is the number of collections per unit time.