JP3769041B2 - How to transfer loose objects using a continuous unloader - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for transferring roses such as ore, coal, grain, salt, sugar, etc., and more particularly to a method for transferring roses using a continuous unloader.
[0002]
[Prior art]
Generally, in factories such as power plants and steelworks, loose articles such as coal and ore carried by ships are unloaded from the hold and directly transferred to each raw material yard or factory via a conveyor. It is normal. Such unloading work has been performed by a grab bucket type or horizontal pull-in type unloader, but recently, using a continuous type unloader with a chain bucket as shown in FIG. And labor saving.
[0003]
In FIG. 1, reference numeral 1 denotes a scraping unit that scrapes loose objects by circulating movement of the chain bucket 2, and 3 denotes a loose object conveyed by the chain bucket 2 via a conveyor disposed on the boom 4. This is a belt feeder which is cut out to the hopper 5 by a fixed amount. The loose material in the hopper 5 is cut out to the in-machine conveyor 7 through the belt feeder 6 and is discharged from the in-machine conveyor 7 to the transfer conveyor 8.
[0004]
Furthermore, the transfer of loose objects from the hold using this continuous unloader will be described in detail with reference to FIG. That is, the scraper 1 of the continuous unloader is inserted in order into each hold 10 of the ship 9 that touches the quay, scraps are continuously scraped off, temporarily stored in the hopper 5, and then the belt feeder 6 The fixed amount is paid out to the transfer conveyor 8 via the in-machine conveyor 7. Here, as shown in the figure, the continuous unloader is configured such that the scraping unit 1 always performs an operation for scraping loose objects on the track 11 in the conveying direction of the transfer conveyor 8. It is essential to move in the forward or reverse direction. On the other hand, the transfer conveyor 8 is installed between a quay and each raw material yard or a factory, and plays a role of conveying loose objects at a constant conveyance speed.
[0005]
[Problems to be solved by the invention]
Although the moving speed of the continuous unloader is lower than that of the transfer conveyor 8, it is about 0.2 to 0.3 times the transfer speed of the transfer conveyor as shown in FIG. Therefore, when the continuous unloader moves in the transport direction of the transfer conveyor, as shown in FIG. 4, the amount of loose articles discharged from the continuous unloader on the transfer conveyor is increased from the expected amount. become. On the other hand, when the continuous unloader moves in the direction opposite to the transfer direction of the transfer conveyor, the amount of loose material dispensed on the transfer conveyor decreases. That is, in such a case, there is a disadvantage that the transport amount on the transfer conveyor is not uniform. Moreover, since it is necessary to set the payout amount so as to be within the capacity range of the transfer conveyor in anticipation of an increase in the payout amount, there is also a problem that the payout amount as a whole is reduced.
Note that the scraping operations A to D in FIG. 3 correspond to the scraping operations A to D illustrated in FIG. 2.
[0006]
In view of this, the present invention proposes a new policy for realizing the quantification of the transfer by uniformizing the roses on the transfer conveyor in the transfer direction of the transfer conveyor in the transfer of the roses using the continuous unloader. With the goal.
[0007]
[Means for Solving the Problems]
The method of the present invention, which was developed to realize the above-mentioned purpose, is used to transfer a rose article along a transfer conveyor when the loose article is transferred via a transfer conveyor installed from one of two points separated from each other. A continuous unloader that moves in both the forward and reverse directions with respect to the transport direction is disposed, and the bulk material stored at one point is used by using the feeder and the in-machine conveyor disposed in the continuous unloader. Discharge on the transfer conveyor, and when transferring to the other point on this transfer conveyor, the amount of roses cut out from the feeder and the in-machine conveyor based on the relative moving speed of the continuous unloader with respect to the transfer speed of the transfer conveyor by adjusting both the conveying speed of the payout amount of the rose of the continuous unloader the transfer conveyor to the following formula (1) A method of transferring the rose was by continuous unloader, characterized in that to hold the transport amount of the rose was due have control to transfer conveyor constant.
Qu = {(Vc−Vu) / Vc} · Qc (1)
Qc ( kg / s ): Accepted amount per unit time of loose objects on the transfer conveyor
Qu ( kg / s ): Dispensing amount from continuous unloader
Vc: Conveying speed of the transfer conveyor
Vu: Travel speed of continuous unloader
(However, Vu is positive in the same direction as Vc and negative in the reverse direction.)
[0009]
[Action]
In the present invention, for example, in order to make the acceptance amount Q _c [kg / s] per unit time of the loose article on the target transfer conveyor constant, the transfer speed V _c of the transfer conveyor and the traveling speed of the continuous unloader Based on the V _u data, the payout amount Q _u [kg / s] from the continuous unloader is expressed by the following formula:
Q _u = {(V _c −V _u ) / V _c } · Q _c ---- (1)
However, by controlling V _u based on the same direction as V _c being positive and the reverse direction being negative, it becomes possible to keep the amount Q _{c received} on the transfer conveyor 8 constant, so This is a method that realizes smooth transfer.
[0010]
Further, FIG. 5 specifically shows the control based on the above equation (1). That is, in accordance with the relative speed difference between the conveyance speed V _c of the transfer conveyor 8 and the traveling speed V _u of the continuous unloader, the amount of cutout V ₁ by the belt feeder in the continuous unloader shown in FIG. and the conveying speed V ₂ of the flight conveyor, by adjusting, as shown in FIG. 5, it can be seen that the accepted amount Q _c onto transfer conveyor is constant.
[0011]
Here, the object to be adjusted in accordance with the relative speed difference between the transport speed V _c of the transfer conveyor and the traveling speed V _u of the continuous unloader is the amount of cut out of the loose article by the belt feeder and the transport speed of the in-machine conveyor. In particular, as shown in FIG. 5, it is preferable to adjust both of them in order to strictly control the amount of acceptance Q _c on the transfer conveyor.
[0012]
This is because if it is limited to the adjustment of the cutout amount of the loose article by the belt feeder, it takes about 10 seconds to reach the transfer conveyor via the in-machine conveyor, and a time delay occurs. As shown in the figure, only the range of the load placed on the in-machine conveyor before adjustment is adjusted as shown in the figure, but since the belt feeder cutout becomes constant after 10 seconds, The original belt feeder cutout amount is restored, and the discharge speed control is impossible only by adjusting the conveying speed of the in-machine conveyor.
[0013]
Therefore, the amount of loose articles placed per unit length of the in-machine conveyor is made constant by the belt feeder, and the change in the relative speed difference between the transfer speed V _c of the transfer conveyor and the running speed V _u of the continuous unloader changes the transfer of the in-machine conveyor. By preparing a system that can respond quickly to speed adjustments, quantitative dispensing with less time delay becomes possible.
[0014]
In addition to the above-described belt feeder, there are vibration feeders, table feeders, and the like as means for cutting out loose articles from the hopper. In these cases, there are similar problems, and the idea of the present invention can be applied.
[0015]
【Example】
In accordance with what is shown in FIG. 5, the amount of payout from the continuous unloader is calculated from the measured values of the transport speed V _c of the transfer conveyor and the traveling speed V _u of the continuous unloader based on the above equation (1). The iron ore was transferred while controlling the calculated payout amount by adjusting the cutout amount of the loose article by the belt feeder and the conveyance speed of the in-machine conveyor in the continuous unloader. As shown in FIG. 7, the transfer history of the transfer conveyor in the transfer can be transferred with a deviation of about ± 10% from the target acceptance amount Q _c on the transfer conveyor.
[0016]
In contrast, if not controlled payout amount by the relative speed difference between the running speed of the continuous unloader the conveying speed of the transfer conveyor, as shown in FIG. 8, the target acceptance amount Q _c in transfer conveyor The deviation from was about ± 30%.
[0017]
In addition, since this invention implement | achieves the stable fixed quantity transfer of the rose thing between two points connected with the transfer conveyor, it is applicable not only to the above-mentioned unloading from the hold but to other similar transfer means.
[0018]
【The invention's effect】
According to the present invention, in the transfer of loose objects using a continuous unloader, it is possible to realize the quantification of the transfer by keeping the amount of the received loose objects on the transfer conveyor constant.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the structure of a continuous unloader.
FIG. 2 is a schematic diagram showing a procedure for transferring loose objects using a continuous unloader.
FIG. 3 is a diagram showing a relative speed difference between a transport speed of a transfer conveyor and a traveling speed of a continuous unloader.
FIG. 4 is a diagram showing variation in the amount of received roses on the transfer conveyor.
FIG. 5 is a diagram showing a control method according to the present invention.
FIG. 6 is a schematic diagram showing a flow of loose objects from a continuous unloader to a transfer conveyor.
FIG. 7 is a diagram showing a transport history on a transfer conveyor.
FIG. 8 is a diagram showing a transport history on a transfer conveyor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Scraping part 2 Chain bucket 3 Table feeder 4 Boom 5 Hopper 6 Belt feeder 7 In-machine conveyor 8 Transfer conveyor 9 Ship
10 Funakura
11 orbit

Claims (1)

A continuous unloader that moves in two directions forward and backward with respect to the transfer direction of the transfer conveyor along the transfer conveyor when transferring the bulk material via the transfer conveyor installed from one of the two points separated from each other The bulk material stored at one point is discharged onto the transfer conveyor using a feeder and an in-machine conveyor disposed in the continuous unloader, and transferred to the other point by the transfer conveyor. In order to achieve this, the continuous unloader is adjusted from the continuous unloader by adjusting both the cutout amount of the bulk material from the feeder and the transport speed of the in-machine conveyor based on the relative moving speed of the continuous unloader with respect to the transport speed of the transfer conveyor. scratch conveyance amount of payout amounts below (1) rose product by transfer conveyor to control in accordance with formula roses of the transfer conveyor Method of transferring the rose was by continuous unloader, characterized in that to hold the.
Qu = {(Vc−Vu) / Vc} · Qc (1)
Qc ( kg / s ): Accepted amount per unit time of loose objects on the transfer conveyor
Qu ( kg / s ): Dispensing amount from continuous unloader
Vc: Conveying speed of the transfer conveyor
Vu: Travel speed of continuous unloader
(However, Vu is positive in the same direction as Vc and negative in the reverse direction.)

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