JP2001255321A - Automatic apparatus for reducing and powdering test of sintered ore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic apparatus for satisfying the ISO standard being an international standard of a sintered ore reducing and powdering test. SOLUTION: The automatic apparatus for a reducing and powdering test of a sintered ore is constituted so as to successively transferring a sintered ore sample to a reaction pipe (2) being a reducing container and having a lid, an ore attrritor drum (12) being a powdering container and having a lid and a sieve net (15) being a classifying container and consists of a nut runner (9) for attaching and detaching the lid of the reaction pipe 2 and a nut runner (13) for attaching and detaching the lid of the ore attritor drum (12). Further, the reaction pipe (2) being the reducing container is provided with a connection place of a pipe for passing reducing gas at the upper part thereof and a detachable coupler (21) is provided to the leading end of the reaction tube by automatic joints (7), (8) and the piping shape of the reaction pipe 2 is set so that a gas pipe (22) on an inlet side is spirally wound around the reaction pipe so as to preheat the reducing gas when the reaction pipe enters a furnace to be connected to the lower hole of the reaction pipe and a gas pipe (23) on an outlet side comes out of the hole bored in the upper lid of the reaction pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing the quality of reduced powder of a raw material for sinter in the iron and steel industry, and more particularly to an automatic apparatus for reducing powder of a sintered ore with high precision, safety and reliability. .

[0002]

2. Description of the Related Art Conventionally, reduction and pulverization tests of sinters have been carried out in most cases, although the frequency of the tests is high, handling between devices such as reduction heating, cooling, rotary pulverization, sieving, and weighing, and operation of equipment are almost complete. The reality is that people depended on human power. For this reason, the work efficiency was remarkably poor, and this was one of the factors that increased the labor costs of ironmaking-related workers.

[0003] This test method itself is an ISO standard and is a well-known fact, and in order to improve work efficiency, an apparatus that automates this test method has been proposed. For example,
There are two prior arts disclosed in JP-A-9-10417 and JP-B-61-32609.

The invention of Japanese Patent Publication No. 59-10417 is
In a granular iron ore quality test apparatus equipped with a reduction furnace, a reduced sample pulverizer, a weigher for weighing the sample, and a vessel transfer mechanism, a hole for passing a reducing gas is provided at the bottom to weigh the sample. Reduced powder of granular iron ore, comprising: a reduction vessel for transferring between a crusher and a reduction furnace; and a powdering vessel for accommodating a reduced sample and transferring to a pulverizer. Test equipment.

[0005] The invention of Japanese Patent Publication No. 61-32609 relates to an apparatus for measuring a powder collapse phenomenon accompanying reduction of a sintered ore, and comprises an automatic weighing device, a sample input device, and a preheating device. A heating furnace for reduction, an elevator device for transferring reduced sintered grains to an automatic weighing device, a rotary pulverizing device, an automatic sieving device, and a sequence control device for comprehensively controlling the operation of each device. This is an automatic reduction powdering test apparatus.

[0006] All the prior arts automate the test in accordance with the standards of the Ironmaking Division.

[0007]

The above two prior arts are originally related to the same automatic reduction and pulverization test apparatus for sinter, and have the same problems. However, both of these devices are compliant with the standards of the Ironmaking Subcommittee before the ISO standard was established. For this reason, there is a problem that these devices do not satisfy the ISO standard which is the current standard due to the device configuration. The following three issues can be summarized.
One is.

[0008] 1. Poor accuracy of input sample 2. 2. Deviation in the shape of the reaction tube Insufficient test safety.

First, in the prior art, since the sample input device is forcibly automated, the target sample weight, that is, “500 g ± about 0.1 g (± 1 fine particles)” defined by the ISO is not applicable. In the prior art, the accuracy is very poor at 500 to 515 g.

The reason for such poor accuracy is that when large granular ore is thrown in at the end of weighing and greatly exceeds the target weight, the particles are manually extracted and replaced with smaller particles to bring the weight closer to the target weight. This is usually due to the fact that the prior art has a structure in which the particles once injected cannot be replaced.

Second, the prior art uses a reducing vessel and a pulverizing vessel and requires compatibility in handling between the two vessels. Therefore, the prior arts have the same outer shape, and are defined by the current standard ISO. Deviating from the shape of the reducing vessel. That is, according to the ISO standard,
The shape of the vessel for powdering (corresponding to the mining machine drum of the present apparatus) has an inner diameter of 130 mm, and the shape of the vessel for reduction (corresponding to the reaction tube of the present apparatus) has an inner diameter of 75 mm, whereas in the prior art, Since it is necessary to make the outer shapes of the two tubes uniform, the thickness of the reaction tube is set to an extremely large value of about 30 mm or more. However, it is considered that the inner diameter of the reaction tube is probably about 50 mm larger than the ISO standard.

Thirdly, in the prior art, a reducing gas pipe is arranged at the bottom of the heating furnace for reduction, and is connected to a hole opened at the bottom of the vessel for reduction. It was hidden by the wall and could not be seen, and it was not possible to visually check the connection state of the gas pipe attaching / detaching part even during the test run, not to mention the actual load.
It is difficult to check the safety of leakage of CO gas and N ₂ gas harmful to the human body. Also, regarding the gas and powder sealing mechanism of the reduction vessel and the powdering vessel, since there is a concern about gas leakage because they are sealed only by their own weight and the pressing force of the cylinder, check for gas leakage and close the lid. There was also a problem in terms of ensuring safety.

An object of the present invention is to provide an automatic apparatus for reducing and pulverizing a sinter which solves these problems.

[0014]

SUMMARY OF THE INVENTION The present invention is directed to an automatic apparatus for reducing and pulverizing sinter ore, which solves the above-mentioned problems, and which comprises a reaction tube (2) having a lid (32) which is a reduction vessel. )
And a grinding machine drum (12) having a lid which is a powdering container, and a sieve mesh (15) of a classification container,
The sinter sample is transferred to these three vessels sequentially, and the nut runner (9) for removing the lid of the reaction tube for attaching and detaching the lid of the reaction tube (2), and the grinding machine drum ( 12) A nut runner (13) device for attaching and detaching the mining machine drum for attaching and detaching the lid, and a reaction tube (2) serving as a reducing container is connected to a tube for allowing a reducing gas to pass therethrough. There is a reaction tube coupler (2 ₁ ) that can be attached and detached with an auto-joint (7) for attaching and detaching a reducing gas tube coupler at the tip of the tube. To be preheated when entering
The gas pipe (2 ₂ ) on the inlet side of the reaction tube is connected to the lower hole of the reaction tube (2) while the gas pipe (2 ₂ ) is spirally wound around the reaction tube (2), and the gas pipe (2 ₃ ) on the outlet side of the reaction tube is at the upper side. An automatic apparatus for reducing and pulverizing sinter ore (1), characterized in that it has a structure protruding from a hole opened in a lid of the sinter. It is to be noted that the sinter ore sample before reduction is measured and charged into the reaction tube (2), and the reaction tube (2)
Closing the lid and setting the reaction tube (2) at the set position are performed manually.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS.
This will be described in detail with reference to FIG.

FIG. 1 is a side view showing an outline of a reduction powdering test automatic apparatus, and FIG. 2 is a plan view showing an outline of a reduction powdering test automatic apparatus. FIG. 3 is a side view showing an outline of the reaction tube, and FIG. 4 is a plan view showing an outline of the reaction tube.

In the apparatus of the present invention, as a pretreatment step, the sinter sample before reduction is measured and charged into the reaction tube (2), the lid (32) of the reaction tube (2) is closed, and the reaction tube (2) Up to the setting of the reaction tube set table (3) is performed manually. The subsequent steps, that is, heating, cooling, pulverization, sieving, weighing, and transmission, are automatically performed by the automatic reduction pulverization test apparatus (1) of the present invention. In addition, the apparatus (1) of the present invention has a facility configuration capable of testing one reaction tube but of course also testing two reaction tubes (2) substantially in parallel. The operation of each device is controlled by a device operation control panel (22), and an operator monitors operation by a device operation monitoring operation panel (23).

The details of a series of operation flows after the automatic operation of the apparatus (1) is started will be described below.

First, a reaction tube handling arm (6 ₁ )
Comes to grasp the reaction tube (2) on the reaction tube setting table (3), and the furnace lid opening / closing device (5) operates to open the furnace lid of the heating furnace (4) which is kept warm in advance. The reaction tube handling arm from the top ₍₆₁₎ to insert the reaction tubes (2) into the furnace (4). Complete the reaction tube (2) is inserted into the furnace (4), the reaction tube handling arm ₍₆₁₎ is retracted release the reaction tube (2). At this time, the gas pipe at the top of the reaction tube is guided by a tapered guide so as to be determined at an accurate position, and the coupler (2 ₁ ) of the reaction tube is sandwiched and held down, so that the coupler of the other side follows the profile. It operates and is connected to the gas pipe above the reaction tube. This is the auto-joint (7) for attaching and detaching the reducing gas pipe coupler, and the connection state of the gas pipe connecting portion can be sufficiently visually checked. Then, the evacuated temperature sensor detacher (26) operates, and the temperature sensor is inserted into the reaction tube (2) from the hole at the top of the reaction tube (2) and set. As shown in FIGS. 3 and 4, the reaction tube (2), which is a container for reduction, is provided with a connecting portion of a tube for allowing a reducing gas to pass therethrough, and the end of the tube is connected to an auto-joint for attaching / detaching a reducing gas tube coupler. Reaction tube coupler (2)
₁ ), and the shape of the reaction tube itself is helically wound around the reaction tube (2) so that the reducing gas is preheated when the reaction tube (2) enters the furnace. The tube (2 ₂ ) is connected to the lower hole of the reaction tube (2) while being wound, and the gas tube (2 ₃ ) on the outlet side of the reaction tube (2) comes out from the hole opened in the upper lid.

Next, as an automatic leak check, the leak valve (25) on both the inlet side and the outlet side is closed, the gas is confined in the gas pipe and held for a few seconds. And if no leakage, proceed to the reduction step. Since the reduction process conforms to the ISO standard, the description is omitted, but is controlled by the reduction gas and heating furnace control monitoring operation panel (21). At the time of the reduction, the exhaust gas containing CO gas is automatically ignited by an exhaust gas combustion burner (24) to burn the gas and then discharged by a ventilation fan. When this process is completed, the exhaust gas combustion burner (24) is automatically extinguished. The ventilation fan is also automatically stopped. Also, during this process, the burner (24) for exhaust gas combustion is monitored with an automatic detection function for a misfire. After completion of the reduction, the auto-joint (7) for attaching / detaching the coupler of the reduction gas pipe operates to disconnect the connection portion.

[0021] Next, the reaction tube handling arm (6 ₂₎
Grasps the reaction tube (2) in the heating furnace (4) and places it on the reaction tube cooling table (30) which has been turned and advanced. The reaction tube handling arm (62) is retracted. In the reaction tube (2), the auto-joint (8) for detaching the coupler of the cooling gas pipe operates to connect the N ₂ gas pipe coupler for cooling, open the valve, and flow N ₂ gas. The cooling fan (27) outside the reaction tube automatically starts operation and automatically stops after a set time. When the out-of-furnace cooling step is completed, the auto-joint (8) for attaching and detaching the cooling gas pipe coupler operates to disconnect the coupler. The reaction tube handling arm (6 ₂₎ is lowered into the reaction tube (2) and catching turning reaction tube transfer conveyor (28). The reaction tube handling arm (6 ₂₎ is returned to the waiting position again release the reaction tube (2).

Next, the reaction tube transfer conveyer (28) operates to carry the reaction tube (2) to the position of the nut runner (9) for removing the reaction tube cover. Then, the nut runner portion of the device comes down, and the bolt fastening the lid (32) of the reaction tube (2) is turned and removed. The bolt is provided with a tapered guide so that the tip of the nut runner (9) for removing the lid of the reaction tube enters smoothly. The lid is grabbed and lifted. If the bolts do not come off once, the reaction tube (2) and the lid do not separate and cannot be lifted up by the lid alone, so that it also has a function of automatically retrying. The reaction tube (2) with the lid removed is moved to the position of the reaction tube reversing machine (10) by the reaction tube transfer conveyor (28) in order to transfer the sample therein to the mining machine drum (12). During that time, the lid of the reaction tube (2) is on standby while being held by the gripping device of the nut runner (9).

Next, the reaction tube inverting machine (10) grasps the reaction tube (2), and inverts the reaction tube (2) on the grinding machine drum (12) while temporarily covering another holding lid. The lid is opened while hammering the side of the reaction tube (2), and the sample slides on the chute into the grinding machine drum (12). The grinder drum (12) is covered, and bolts are fastened with a nut runner (13) for detaching the drum cover. The miner drum (12) was turned upside down from the state in which the mouth was turned upward, so that the miner drum rotation tester (1) was turned sideways.
Start the operation of 1). The turning operation of the mouth of the mining machine drum (12) is accurately positioned by the turning machine (14) of the mining machine drum having a tapered coupling, a stopper and a sensor. In the meantime, the empty reaction tube (2) grasped by the reaction tube reversing machine (10) is placed on the reaction tube transfer conveyor (28) and transferred to the empty reaction tube dispenser (19), where the empty reaction tube holder is placed. (20).

In parallel with this operation, the sieve net container handling arm (17) operates, and the sieve net transfer conveyor (29).
The sieve net container (15) paid out from
8) Place on top and weigh the tare. Sieve net container (15)
Is a coarse mesh with a spill prevention frame.
The 3 mm mesh and the under-size sieve tray are in an overlapping state, and the test result requires the weight of the 2.83 mm-size sieve under the sieve and the total weight. Therefore, weigh the tare weight of the tray and the tare weight of all three. .

After the completion of the rotary pulverization test, the grinder drum (12) is turned up once with the grinder drum mouth reorienting machine (14), and the drum lid is placed on the grinder drum. It is removed by the nut runner (13) for attaching and detaching the lid, grasped and moved to the retracted position. And the mining machine drum (12)
Turn the mouth downward to take out the sample inside. Below, a three-stage sieve mesh container (15) is caught by a sieve mesh container handling arm (17) via a chute and is waiting. After hammering the side of the mining machine drum (12) to completely discharge the sample, the machine returns to the standby state with the mouth facing upward.

The sieve mesh container handling arm (17) has 3
The tiered sieve mesh container (15) is placed on the sieving machine (16) and evacuated. Then, the sieving process is started. After completion of the sieving, the under-sieve measurement and the total under-sieve measurement are performed for each net container (15). The weighed net container (15) is moved to the standby position by the sieve net container handling arm (17),
The arm itself (17) is also evacuated. The handling of the weighing value is deducted from the tare weight, the ratio between the total weight under the sieve and the weight under the sieve is automatically calculated, and a series of data is automatically transmitted to the blast furnace factory etc. It is also printed out inside. This completes the automatic operation.

During the automatic operation of the apparatus (1), the safety door (31) and its interlock function are activated so that no one enters the operating range of the apparatus. , Also informs them of the state of access. In addition, it has a function that can return to automatic operation after rework even if it is temporarily stopped during automatic operation.

[0028]

The above three problems (accuracy of input sample, shape of reaction tube, safety of test) can be solved as follows.

First, with respect to the accuracy of the input sample, in the prior art, the sample input device is forcibly automated by a conveyor and a feeder, whereas in the present device, the sample input setting process is performed while being manually adjusted. Therefore, the accuracy of the ISO is satisfied.

Second, as for the shape of the reaction tube (2), the prior art apparatus required compatibility with the outer shape of the grinding machine drum (12), but this apparatus does not require compatibility. The shape of the main vessel, the reaction tube (2) and the grinding machine drum (12), perfectly conforms to the ISO standard. Further, an arm and a transfer device for handling these components, an auto-joint for attaching and detaching a reducing gas pipe coupler (7) and an auto-joint for attaching and detaching a cooling gas pipe coupler (8), and a nut runner for attaching and detaching a reaction tube lid (9). By making full use of the nut runner (13) for attaching and detaching the drum cover of the mining machine, the compact and reliable automatic device is realized.

Third, regarding the safety, in the prior art, the gas pipe connection portion was at the bottom portion, and it was difficult to check and check. On the other hand, in the present apparatus, the gas pipe connection / detachment coupler connection portion was provided at the upper portion of the reaction tube. It is easy to check for connection failures and has an automatic leak check function that holds the coupler internal pressure and detects leaks with a pressure sensor. Further, in consideration of the adhesion of the reduced sample to the reaction tube (2) and the grinding machine drum (12),
It also has a hammering function. In addition, although the number of tests is unknown in the case of the prior art, the total process time is 4.
It took 5 to 5.0 hours, but the actual required time when using this apparatus (1) with two hooks is not at all inferior to the manual handling performance of 3.0 to 3.5 hours.

[Brief description of the drawings]

FIG. 1 is a side view showing an outline of a reduction powdering test automatic device.

FIG. 2 is a plan view showing an outline of a reduction powdering test automatic device.

FIG. 3 is a side view showing an outline of a reaction tube.

FIG. 4 is a plan view showing an outline of a reaction tube.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS ₁ Automatic reduction-pulverization test device 2 Reaction tube 2 ₁ Reaction tube coupler 2 ₂ Gas tube on reaction tube entrance side ₃ Gas tube on reaction tube exit side 3 Reaction tube set base 4 Heating furnace 5 Furnace lid switch 6 ₁ Reaction Pipe handling arm (for loading into furnace) 6 ₂ Reaction pipe handling arm (for transporting outside furnace) 7 Autojoint for attaching / detaching reduction gas pipe coupler 8 Autojoint for attaching / detaching cooling gas pipe coupler 9 Nut runner for removing lid of reaction tube 10 Reaction Tube reversing machine 11 Grinding machine drum rotation test machine 12 Grinding machine drum 13 Nut runner for grinding machine drum cover attaching / detaching 14 Grinding machine drum opening reversing machine 15 Sieve mesh container 16 Sieve sorting machine 17 Sieve mesh container handling Arm 18 Weighing device 19 Empty reaction tube dispenser 20 Empty reaction tube holder 21 Control and control panel for reducing gas and heating furnace 22 Device operation control panel 23 Device operation monitoring and control panel 2 The lid of the exhaust gas combustion burner 25 leak check valve 26 Temperature sensor desorption unit 27 reaction tube cooling fan 28 reaction tube transfer conveyor 29 sieve screen transfer conveyor 30 the reaction tube cooling stage 31 safety door 32 reaction tubes

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazuhiko Matsui 1 Kimitsu, Kimitsu-shi Nippon Steel Corporation Kimitsu Works F-term (reference) 4K001 AA10 CA35

Claims (1)

[Claims] 1. A reaction tube having a lid which is a reducing vessel, a grinding machine drum having a lid which is a pulverizing vessel, and a sieve net of a classification vessel, and a sintered ore sample is sequentially placed in each vessel. A nut runner for detaching and attaching the lid of the reaction tube; and a nut runner for detaching and attaching the lid of the grinding machine drum. A connection point of the pipe for passing gas is provided, and a coupler that can be attached and detached with an auto joint is provided at the tip of the gas pipe of the reaction tube, and the gas pipe shape of the reaction tube is reduced when the reaction tube enters the furnace. The gas tube on the inlet side is connected to the lower hole of the reaction tube while spirally winding around the reaction tube so that the gas is preheated, and the gas tube on the outlet side comes out from the hole in the upper lid. Automatic reduction and crushing test for sinter.