JPH0114659Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention coarsely granulates the reduced iron powder cake using primary granulating equipment, and then finely granulates it using secondary granulating equipment. The present invention relates to iron powder disintegration equipment that sieves iron powder according to particle size, and particularly to an iron powder feeding device that can improve the sieving efficiency of a vibrating sieve machine.

[Conventional technology]

Generally, iron powder that has been reduced in a reduction furnace is extracted as a solidified plate-shaped iron powder cake, so it is coarsely granulated in a primary granulator and then finely pulverized in a secondary granulator. It is granulated and then sieved to a predetermined particle size.

The above-mentioned primary crushing equipment is equipped with a crushing device that divides and crushes the iron powder cake conveyed by a steel belt into appropriate sizes, and a crusher that coarsely crushes the divided iron powder cake. has been done.

The secondary pulverization equipment includes a buffer hopper that accommodates the coarsely pulverized iron powder, a vibration feeder connected to the lower part of the buffer hopper, and a pulverizer that finely granulates the iron powder conveyed and supplied by the vibration feeder. It is equipped with a feather mill and a vibrating sieve that sieves the finely pulverized iron powder into under-powder, which is smaller than a predetermined particle size, and over-powder, which is larger than this.

In the above primary and secondary crushing equipment, iron powder cake is
After crushing and coarse granulation using a primary pulverizing equipment, the powder is finely pulverized into desired powder particles using a secondary pulverizing equipment, and then classified into over powder and under powder by passing through a vibrating sieve. Then, this under powder is recovered as a product iron powder, and the over powder is once again crushed by a feather mill and sieved. In this case, the vibration feeder's conveyance frequency is set so that it can supply a certain amount of iron powder according to the sieving capacity of the vibrating sieve machine.

[Problem that the invention attempts to solve]

However, in the conventional apparatus described above, there are cases where the amount of iron powder is not supplied in accordance with the sieving capacity of the vibrating sieve machine. That is, the powder surface of the iron powder in the buffer hopper may fluctuate due to an imbalance between the amount supplied to the hopper and the amount discharged from the hopper, and if this fluctuation in the powder surface becomes abnormally high, for example, the vibration feeder In some cases, the amount of iron powder supplied to the vibrating sieving machine increases beyond a predetermined amount. As a result, the supply amount exceeds the capacity of the sieving machine, and even if it is under-sized powder, it will not fall through the sieve and will be discharged as over-sized powder, resulting in a significant drop in sieving efficiency and, as a result, a decline in product yield. There is a problem. Furthermore, as the supply amount increases, the screen of the sieving machine becomes more likely to be damaged, resulting in a shortened service life.

This invention was developed to solve the above-mentioned conventional problems, and it improves sieving efficiency by always ensuring a constant amount of iron powder supplied to the vibrating sieve even if the powder level in the buffer hopper fluctuates. stabilize,
The object of the present invention is to provide an iron powder supply device for secondary crushing equipment that can avoid deterioration in product yield and extend the life of the screen.

[Means for solving problems]

The present invention is an iron powder supply device in a secondary disintegration facility in which iron powder is fed to a vibrating sieve by a vibrating feeder and sieved into a desired particle size. iron powder flow rate detection means for detecting the flow rate of iron powder, and iron powder supply amount control means for controlling the conveyance frequency of the vibration feeder so that the detected flow rate becomes a predetermined iron powder supply flow rate set in advance. It is characterized by

[Effect]

According to the iron powder supply device in the secondary crushing equipment according to the present invention, the flow rate of the iron powder supplied to the vibrating sieve machine is detected, and the flow rate of the iron powder from the vibrating feeder is adjusted so that the detected flow rate becomes a predetermined supply flow rate. Since the supply amount is adjusted, a stable constant amount of iron powder can always be supplied even if the powder level in the buffer hopper fluctuates. In other words, since it can be supplied according to the sieving capacity of the vibrating sieve machine, sieving efficiency is improved, product yield can be prevented from deteriorating, the load on the screen is reduced, and its life can be extended accordingly.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are diagrams for explaining an iron powder supply device in an iron powder crushing facility according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a primary crushing equipment for coarsely granulating a solid iron powder cake that has been subjected to reduction treatment in a reduction furnace (not shown) and is conveyed by a steel belt 2. A variable speed granulator 4 is installed at the lower part of a chute 3 arranged in the granulator 4, and a horizontal transfer lift 5 extending horizontally and a vertical transfer lift 6 extending vertically upward are sequentially connected to the discharge port 4a of the granulator 4. It is configured as follows.

7 is a secondary crushing equipment for finely granulating and classifying the iron powder transferred by the vertical transfer lift 6, and this is connected to a vibrating conveyor 8 extending horizontally to the vertical transfer lift 6. The lower part of this is connected to a buffer hopper 10 via a bellows-type expansion joint 9, and a vibrating feeder 11 is disposed at the lower part of the buffer hopper 10 via an expansion joint 9. A feather mill 12 as a machine is connected thereto, and a vibrating sieve machine 13 is further connected to the lower part of the feather mill 12 via an expansion joint 9.

A 90-mesh screen is stretched between the upper sieve tub 13a and the lower sieve tub 13b of the vibrating sieve machine 13. An over powder collection pipe 14a is connected to the upper sieve tub 13a, the lower end of the collection pipe 14a is connected to an over powder vibrating conveyor 15, and an under powder collection pipe 14b is connected to the lower sieve tub 13b. ,
The lower end of the recovery pipe 14b is connected to the under powder vibrating conveyor 16.

An iron powder flow rate detector 17 as an iron powder flow rate detection means is disposed at the inlet of the vibrating sieving machine 13, and the flow rate detector 17 detects the iron powder flow rate from the feather mill 12, and in turn the vibration. Detecting the flow rate of iron powder conveyed by the feeder 11,
The detected iron powder flow rate is output.

18 is a supply fluctuation unit that compares the detected iron powder flow rate with a predetermined set supply flow rate Q that is preset according to the sieving capacity of the vibrating sieve machine 13, and outputs a supply fluctuation amount ΔQ that is the difference between the two. Quantity calculation device, 1
Reference numeral 9 denotes a frequency control device that controls the conveyance frequency of the vibrating feeder 11 so that the amount of variation ΔQ from the arithmetic device 18 becomes zero. An iron powder supply amount control device 23 is configured as an iron powder supply amount control means for controlling the powder supply amount to a set supply amount Q.

In addition, 20 is a recovery hopper for recovering the sifted under powder as product iron powder, 21 is a re-pulverizing device for re-pulverizing the above-mentioned over-pulverizing powder, and 22 is a re-pulverizing device for re-pulverizing the sifted powder by this re-pulverizing device 21. This is an over-flour processing device for processing over-flour.

Next, the effects of this embodiment will be explained.

First, to outline the operation of the entire iron powder disintegrating equipment of this embodiment, the plate-shaped iron powder cake conveyed by the steel belt 2 is coarsely disintegrated by the disintegrator 4, and the conveying lift 5 ,6,vibrating conveyor 8
is accommodated in the buffer hopper 10 and conveyed to the feather mill 12 by the vibrating feeder 11,
After being finely pulverized here, the powder is sieved by a vibrating sieve 13 into over powder and under powder.
This under powder is recovered as product iron powder by Hoppa 20.
The over powder is transferred to the re-crushing device 21, where it is re-cracked and classified, and the sifted under-powder is transferred to the collection hopper 2.
At 0, the over-powder is transferred to the over-powder processing device 22, where it is re-pulverized as product iron powder for secondary purpose.

Next, the operation of the iron powder supply device according to this embodiment will be described in detail. The iron powder accommodated in the buffer hopper 10 is supplied to the feather mill 12 in an amount corresponding to the conveyance frequency of the vibrating feeder 11 and the powder surface level in the buffer hopper 10, and is also supplied from the feather mill 12 to the vibrating sieve 13. The flow rate of iron powder is detected by a flow rate detector 17 and outputted to a supply fluctuation calculation device 18.
Then, this calculation device 18 compares the detected flow rate with the set supply flow rate Q, calculates the difference between these two flow rates,
The frequency control device 19 uses this as the supply fluctuation amount ΔQ.
Output to. The control device 19 calculates a conveyance vibration frequency to make the supply fluctuation amount ΔQ zero, and controls the conveyance vibration frequency of the vibrating feeder 11 to the calculated vibration frequency. Then, as a result, the vibrating sieve machine 1
The supply flow rate to No. 3 will be controlled to the above-mentioned set flow rate Q.

In this way, according to this embodiment, the vibrating sieve machine 1
The frequency of the vibration feeder 11 is controlled so that the amount of iron powder supplied to the buffer hopper 10 becomes a predetermined set supply flow rate Q, so that a stable supply flow rate is always ensured even if the powder surface in the buffer hopper 10 fluctuates. can. Therefore, since iron powder can be supplied according to the sieving capacity of the sieving machine, it is possible to improve sieving efficiency and product yield, and the load on the screen is reduced, extending the life of the screen accordingly. can.

In addition, since a stable iron powder supply flow rate can be ensured and sieving efficiency can be improved, the amount of oversized powder is reduced, and the burden of oversized powder processing on the re-granulator 21 is correspondingly reduced, and productivity can be improved.

[Effect of idea]

As described above, the iron powder supply device in the secondary disintegration equipment according to the present invention includes an iron powder flow rate detection means for detecting the flow rate of iron powder, and a predetermined iron powder whose detected flow rate is set in advance. Since the iron powder supply amount control means is provided to control the conveyance frequency of the vibrating feeder so as to maintain the supply flow rate, a stable supply flow rate can always be ensured even if the powder surface of the iron powder in the buffer hopper fluctuates. As a result, the sieving efficiency can be improved, the yield can be improved, and the life of the screen of the sieving machine can be extended.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram for explaining an iron powder supply device in a disintegration facility according to an embodiment of the present invention, and FIG. 2 is a diagram of the entire disintegration facility. In the figure, 7 is secondary granulation equipment (iron powder granulation equipment), 10 is a buffer hopper, 11 is a vibration feeder, 12 is a feather mill, 13 is a vibration sieve,
17 is an iron powder flow rate detection device (iron powder flow rate detection means);
23 is an iron powder supply amount control device (iron powder supply amount control means).

Claims (1)

[Scope of utility model registration request] The iron powder coarsely pulverized by the primary pulverizing equipment is stored in a buffer hopper, conveyed from the buffer hopper to a feather mill by a vibrating feeder, finely pulverized by the feather mill, and then fed to a vibrating sieve to obtain the desired particle size. In the secondary disintegrating equipment, the iron powder is supplied to the vibrating sieve so that the flow rate of the iron powder becomes a predetermined flow rate, and the iron powder is supplied to the vibrating sieve at a predetermined flow rate. The present invention is characterized by comprising an iron powder flow rate detection means for detecting the iron powder flow rate, and an iron powder supply amount control means for controlling the conveyance frequency of the vibrating feeder so that the detected flow rate becomes a predetermined iron powder supply flow rate set in advance. Iron powder feeding device for secondary crushing equipment.