JP2022165711A - Conveying situation display system, and raw material ore pretreatment facility comprising the same - Google Patents

Abstract

To provide a conveying situation display system capable of quickly and surely notifying a field worker of a situation thereof, when clogging is generated inside a hopper and a device trouble is generated due to a property of an article to be conveyed, a human error or the like.SOLUTION: According to a belt conveyor 6 for conveying raw material ore such as, for example, nickel oxide ore or the like having a moisture content of 20 mass% or more and 50 mass% or less, that is supplied from a lower end part of a hopper 5; provided are a detector 10 that outputs a signal by detecting this situation at a time when it is interrupted to convey the raw material ore, and a display part 20 comprising a first pilot lamp that is lit by the signal output from the detector 10 and a second pilot lamp for displaying an operation situation of the belt conveyor 6.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a transportation status display system for displaying the transportation status in transportation equipment for raw material ore processed by a hydrometallurgical method or the like for nickel oxide ore, and a raw material ore pretreatment facility equipped with the same.

As a hydrometallurgical method for nickel oxide ore, a high-pressure acid leaching method using sulfuric acid, which is also called HPAL (High Pressure Acid Leaching) method, is known. In this hydrometallurgical method, since the raw material nickel oxide ore is consistently wet-processed to produce the product nickel-cobalt mixed sulfide, conventional general nickel oxide ore that has a reduction process and a drying process is used. It is an energy- and cost-advantageous process compared to the pyrometallurgical method, which is a smelting method. The hydrometallurgical method also has the advantage that the nickel-cobalt mixed sulfide with a nickel content of about 50% by mass can be efficiently produced from a low-grade nickel ore with a nickel content of about 1%.

In the hydrometallurgical plant that performs processing by the above HPAL method, in order to increase the reaction efficiency during the acid leaching treatment of the raw material ore made of nickel oxide ore, a plurality of equipment such as crushers and sieving machines are connected to belt conveyors. By introducing the raw material ore into a pretreatment facility that is continuously connected via a conveying facility, pretreatment is performed to reduce the particle size step by step. In this case, if the supply of raw material ore to each equipment is temporarily interrupted, or conversely, excessive supply causes an overload condition, the preprocessed ore raw material is stably supplied to the subsequent processing process. This leads to lower productivity and lower product quality. In order to prevent such problems, a hopper for feeding the material to be conveyed is provided in the preceding stage of the belt conveyor, and the level of the powder or granular material in the feeding hopper is measured. Techniques such as providing a detector for detection have been proposed.

For example, in Patent Document 1, in a conveying facility having a structure in which a charging hopper is provided between two continuous belt conveyors for conveying raw materials for ironmaking, the wall of the charging hopper is placed from the allowable upper limit position of the storage capacity. A technique is disclosed in which a bypass pipe extending obliquely downward is provided, and a receptacle that is urged upward by a spring is provided movably in the vertical direction immediately below the lower end side outlet of the bypass pipe. As a result, when an excess of ironmaking raw material is supplied beyond the capacity of the charging hopper, the excess ironmaking raw material passes through the bypass pipe and is stored in the tray, so the tray moves downward due to gravity. do. As a result, the limit switch striker provided on this tray actuates the limit switch, making it possible to stop the drive motor of the belt conveyor.

Further, in Patent Document 2, a rotating detection arm is provided at the center in the width direction of a belt conveyor, and a sensor detects whether or not the detection arm is tilted in the conveying direction by an object to be conveyed. A technique for detecting that a conveyed object is being conveyed on a conveyor is disclosed. Patent Document 3 discloses that a light projecting device and a light receiving device are provided on both sides of a belt conveyor in the width direction. There is disclosed a technique for detecting that an object is being conveyed on a belt conveyor based on whether or not the object blocks a light beam traveling straight through a belt conveyor.

Japanese Utility Model Laid-Open No. 57-181718 JP-A-54-027167 Japanese Utility Model Laid-Open No. 60-193489

However, when handling moist and sticky ore, such as raw material ore stored outdoors in a stockpile state, the technique of Patent Document 1 blocks the bypass pipe with the sticky ore, preventing normal operation. It may not work. In addition, moist ore is difficult to spread evenly on the surface of the conveyor, so if the ore is unevenly distributed at the ends in the width direction, it cannot be detected by the detection arm of Patent Document 2. The technique of Patent Document 3 is thought to be able to detect even moist ore, but conversely, if dry ore with little moisture is transported, dust that is blown up from the ore during transport may reach the surface of the light projecting device or light receiving device. There is a risk that it will adhere and make it impossible to detect it accurately.

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-described problems of the conventional conveying equipment, and the conveying equipment for raw material ore such as nickel oxide ore processed in a hydrometallurgical plant can improve the properties of the material to be conveyed and human To provide a conveying status display system capable of promptly and surely informing a field worker of the situation when clogging occurs in a hopper due to an error or the like or when an equipment trouble occurs. .

In order to achieve the above object, a raw material ore conveying status display system according to the present invention detects when the raw material ore is interrupted in the belt conveyor that conveys the raw material ore supplied from the lower end of the hopper. a detector that outputs a signal, and a display unit that has a first indicator lamp that is lit by the signal output from the detector and a second indicator lamp that displays the operating status of the belt conveyor. do.

According to the present invention, in transportation equipment for raw material ore such as nickel oxide ore, clogging occurs in the hopper or equipment trouble occurs due to human errors such as delay in the timing of ore input of the wheel loader or the properties of the material to be transported. occurs, it is possible to quickly and reliably inform the field worker of the situation. As a result, it is possible to minimize problems such as a decrease in the supply amount of the raw material ore in the subsequent processing steps. In addition, the need for a worker to monitor the condition inside the hopper, which has been conventionally required, is no longer required, thus making it possible to reduce costs.

1 is a block flow diagram of a nickel oxide ore pretreatment process in which a pretreatment facility equipped with a raw material ore transportation status display system according to the present invention is preferably used; FIG. 1 is a schematic vertical cross-sectional view of a pretreatment facility equipped with a transportation status display system according to an embodiment of the present invention; FIG. FIG. 3 is a side view showing a detector that constitutes the transportation status display system of FIG. 2; FIG. 4 is a cross-sectional view of the detector of FIG. 3 as seen from the direction of the arrow on line IV-IV; In order to inform the operator of the wheel loader whether or not it is necessary to put in raw material ore, the first display part in the transportation status display system of FIG. It is a diagram. In order to inform the operator of the wheel loader of whether or not it is necessary to charge the raw material ore, in the transportation status display method of the comparative example of the present invention, the indicator light indicating that the belt conveyor is operating is lit and the hopper supervisor signals the permission of charging. and the state (b) in which the belt conveyor stop indicator light is on and the hopper guard is giving a signal to prohibit loading. In the conveying status display method shown in FIG. 6, the belt conveyor is stopped due to (a) misidentification of the amount of ore inside the hopper by the hopper monitor and lack of communication (b) between the hopper monitor and the wheel loader operator. It is a figure which shows a mode that it stops.

An embodiment of the transportation status display system of the present invention will be described below with reference to the drawings. The conveying status display system of this embodiment of the present invention is suitably employed in equipment for conveying nickel oxide ore used as a raw material in a hydrometallurgical plant that performs processing by the HPAL method. The HPAL method includes a leaching step in which raw material ore made of nickel oxide ore is charged into an autoclave together with sulfuric acid and subjected to acid leaching treatment under high temperature and high pressure, and the obtained leaching solution containing nickel and cobalt is neutralized. a neutralization step of obtaining a final neutralization solution from which impurity elements contained in the leachate have been removed; It is generally composed of a liquid purification step for obtaining a recovered mother liquor and a sulfurizing step for producing a nickel-cobalt mixed sulfide by adding a sulfurizing agent such as hydrogen sulfide gas to the nickel recovered mother liquor under a pressurized atmosphere.

The raw ore used as a raw material in the above hydrometallurgical plant is charged into an autoclave after being finely adjusted in particle size by crushing and classification in order to increase the reaction efficiency during acid leaching. Specifically, as shown in FIG. 1, nickel oxide ore mined from a mine is first put into a coarse screen with an opening of 300 mm by a wheel loader in a coarse particle removal step, and the coarse screen with an opening of 300 mm is used. Coarse particles that cannot pass through the screen (referred to as over 300 mm, hereinafter the same) are removed on the upper side of the sieve, and particles that have passed through the screen (referred to as under 300 mm, the same applies hereinafter) are collected on the lower side of the sieve.

Next, in the first sieving step, the above 300 mm under is introduced into a vibrating sieve, where, for example, by sieving with a first screen having an opening of 150 mm, 150 mm over that cannot pass through the first screen is screened. While being removed to the upper side, the under 150mm which passed through this 1st screen is collect|recovered by the sieve lower side. Next, in the washing process, the under 150 mm is put into a rotatably supported drum-type rotary crusher called a trommel, and washed by spraying washing water while being crushed by agitation caused by the rotation.

Next, in the second sieving step, the ore crushed and washed by the drum-type rotary crusher is introduced into a wet vibrating sieve, where it is washed with washing water such as industrial water sprayed from above. It is sieved with a second screen having an opening of 25 mm, for example. As a result, 25 mm over that cannot pass through the second screen is removed to the upper side of the sieve, and 25 mm under that has passed through the second screen is collected in the form of ore slurry on the lower side of the sieve.

Next, in the third sieving step, the ore slurry containing the under 25 mm is introduced into a wet vibrating sieve, where it is washed with washing water such as industrial water sprayed from above, for example, with an opening of 1.4 mm. It is sieved through the 3rd screen. As a result, 1.4 mm over that cannot pass through the third screen is removed to the upper side of the screen, and 1.4 mm under that has passed through the third screen is recovered in the form of ore slurry on the lower side of the sieve.

Next, in the gravity sedimentation step, the ore slurry containing the above 1.4 mm under is introduced together with a flocculant into a thickener composed of a substantially cylindrical sedimentation tank and a rake rotating along the bottom surface thereof, where gravity sedimentation is performed. and is discharged from the bottom as an ore slurry having a slurry concentration of about 40% or more. The ore slurry thus prepared in the pretreatment step is pressurized by a slurry pump and sent to the autoclave for the leaching step described above.

Next, with reference to FIG. 2, the pretreatment equipment in the first half of the coarse particle removal step and the first sieving step of the pretreatment steps will be described in detail. The first half of the pretreatment facility shown in FIG. A static grizzly 1 that classifies the nickel oxide ore and removes coarse materials, a chute 2 that guides the ore raw material that has passed through the static grizzly 1 to equipment below, and an ore raw material guided by this chute 2, for example, an eye A vibrating sieve machine 3 for sieving by a vibrating first screen with an opening of 150 mm, an oversize chute 4 for receiving 150 mm over discharged from the sieve upper side of the first screen, and a 150 mm under sieve on the sieve lower side of the first screen. and a belt conveyor 6 for conveying the under 150 mm waste discharged from the lower end of the hopper 5 toward a drum-type rotary crusher (not shown) in the subsequent stage.

The conveying status display system of the embodiment of the present invention includes a detector 10 that detects when the conveying of raw material ore under 150 mm as an object to be conveyed on the belt conveyor 6 is interrupted and outputs a signal. and a display unit 20 having a first indicator lamp that is lit by the signal output from the detector 10 and a second indicator lamp that displays the operating status of the belt conveyor 6 . A transportation status display system according to an embodiment of the present invention, which is composed of the detector 10 and the display section 20, will be described in detail below.

In the pretreatment facility where the conveying status display system of the embodiment of the present invention is introduced, the raw material ore generally made of nickel oxide ore with a moisture content of 20% by mass or more and 50% by mass or less is handled. Clogging may occur in the first screen of , or a so-called bridge may be formed in the hopper 5 to prevent smooth discharge from the lower end. In addition, it is preferable that the height of the raw material ore temporarily stored in the hopper 5 is within the range of 500 to 1000 mm from the bottom. If the height inside the hopper 5 exceeds 1000 mm, the inside of the hopper 5 may become clogged.

If the vibrating sieve 3 is clogged or the hopper 5 is clogged, the raw material ore will not be conveyed satisfactorily on the belt conveyor 6 . Therefore, by providing the belt conveyor 6 with a mechanical detector 10 that detects when the transportation of the raw material ore on the belt conveyor 6 is interrupted and outputs an electric signal, the vibrating screen can be indirectly The site worker can be informed of clogging of the machine 3 and clogging of the hopper 5. - 特許庁

Specifically, as shown in FIGS. 3 and 4, the detector 10 traverses the belt conveyor 6 at a position above the belt conveyor 6 and immediately downstream of the lower end of the hopper 5 in the conveying direction. support portions 12 that rotatably support both ends of the rod-shaped portion 11; a plurality of swingable rocking bodies 13 that hang down from the rod-shaped portion 11; and a sensor unit 14 for detecting from the rotation angle of the rod-like portion 11 that the inclination angle θ when the rocking body 13 is inclined by coming into contact with the raw material ore conveyed by the belt conveyor 6 has become less than a predetermined angle. be done.

By installing the rod-shaped portion 11 having the rocking member 13 at a position as close as possible to the lower end of the hopper 5 in this way, it is possible to quickly detect that there is a problem with the conveying state of the object to be conveyed by the belt conveyor 6. Therefore, it is possible to minimize problems after the leaching process in the subsequent process. Although the number of the rocking bodies 13 is not particularly limited, it is preferable that the rocking bodies 13 are composed of a total of three rocking bodies 13, one at the substantially central portion in the axial direction of the rod-shaped portion 11 and the other on both sides thereof. As a result, it is possible to reliably detect even if the object to be conveyed is placed on the belt conveyor 6 unevenly in the width direction and conveyed. Moreover, since the overall weight can be reduced, the impact with the object to be conveyed can be softened, and wear and deformation of the rocking body 13 can be suppressed.

When three oscillating bodies 13 are provided, as shown in FIG. 4, in each of areas A ₁ , A ₂ , and A ₃ obtained by substantially dividing the effective conveying area A of the belt conveyor 6 in its width direction into three equal parts, It is preferable that they are mounted apart from each other so that the rocking body 13 is positioned substantially at the center in the width direction. This makes it possible to detect the transported object more reliably. If the number of rocking bodies 13 is two or less, if the raw material ore is conveyed in a state of being biased only at the substantially central portion in the width direction of the belt conveyor 6 or only at the end portion, it will be difficult to detect it. Conversely, if the number of rocking bodies 13 exceeds three, the weight of the whole becomes heavy, and it is necessary to use the bar-shaped part 11 and the support part 12 having strength corresponding to this, resulting in high cost.

The support portion 12 is provided on the upper surface of a base portion 8 extending horizontally from the upper end portion of the leg portion 7, and the leg portion 7 is attached to a frame 6a that supports the roller group of the belt conveyor 6. As shown in FIG. The base portion 8 preferably has a structure capable of moving vertically with respect to the leg portion 7 . For example, the leg portion 7 and the base portion 8 are fastened with bolts and nuts, and the bolt holes of the leg portion 7 for bolt insertion are elongated holes extending in the vertical direction. It can be realized by setting

In this way, by making the base 8 vertically movable, the height of the base 8 can be changed when the particle size, characteristics, conveyance amount, etc. of the object conveyed by the belt conveyor 6 are changed. By appropriately adjusting the height, the inclination angle .theta. at which the rocking body 13 inclines in contact with the conveyed object can be set to a suitable angle. The tilt angle θ of the rocking member 13 is preferably about 15 to 30°, more preferably about 20°.

FIG. 4 shows a case where two support portions 12 support both ends of the rod-shaped portion 11 , but the present invention is not limited to this, and the rod-shaped portion 11 is supported by three or more support portions 12 . good too. In this case, a long member such as L-shaped steel or C-shaped steel is used for the base portion 8 on which the support portion 12 is provided, and this is bridged between a pair of legs 7 on both sides in the width direction of the belt conveyor 6. is preferred. As a result, it is possible to prevent the rod-shaped portion 11 from bending due to the impact when the swinging body 13 comes into contact with the transported object. A pair of side plates 9 are provided at both ends of the belt conveyor 6 in the width direction so as to prevent the objects to be conveyed from falling. The area between the pair of side plates 9 is the effective transfer area A described above.

Since at least the tip portion of the rocking body 13 is always in contact with the raw material ore conveyed by the belt conveyor 6, it is preferably made of carbon steel so as not to be easily worn or deformed. The shape of the rocking body 13 may be a belt-like shape having a constant width and thickness as shown in FIG. In either case, the tip of the rocker 13 is preferably parallel to the conveyor surface of the belt conveyor 6, as shown in FIG. That is, generally, the conveying rollers of the belt conveyor 6 are rotatably attached to the frame 6a so that the rotation shafts on both sides in the width direction are inclined. is preferably slanted along the conveyor surface.

As shown in FIG. ₃ , the distance D1 between the front end of the swinging body 13 and the conveyor surface of the belt conveyor 6 when it hangs straight down without coming into contact with the conveyed object is 30 mm or more and 70 mm or less. preferable. If the separation distance is less than 30 mm, the belt of the belt conveyor 6 may come into contact with the leading end of the oscillating body 13 when lifted due to vibration or the like, causing deformation or the like. It may not be possible to detect the raw material ore that is used. In order to increase the strength of the rocking body 13, it is preferable to provide plate-like ribs extending in the longitudinal direction. In this case, a rib made of a long plate-like member may be welded to the central portion in the width direction of the oscillating body 13 so as to have a T-shaped cross section, or a rectangular plate-like member may be fixed to have a T-shaped cross section. The oscillating body 13 having ribs may be integrally formed by being folded.

As shown in FIG. 3, the swinging body 13 is tilted to the right side of the paper surface as indicated by the one-dot chain line when it comes into contact with the conveyed object conveyed by the belt conveyor 6, and when the conveyance of the conveyed object is interrupted, the swinging body 13 tilts as indicated by the solid line. It hangs down to the bottom. If the oscillating body 13 inclines to the left side of the paper surface beyond the position where it hangs down directly below, the oscillating body 13 may be deformed or the sensor section 14 may make an erroneous detection. In order to prevent this, it is preferable to provide a stopper 15 so that the swinging body 13 does not tilt in the direction opposite to the conveying direction of the belt conveyor 6 . Thereby, the reliability of the detector 10 can be improved. The material of the stopper 15 is not particularly limited, but an elastic body such as rubber is preferable.

In addition, as shown in FIG. 3, in order to equalize the height of the ridges on the conveyor surface formed by the raw material ore discharged from the lower end of the hopper 5, at least the downstream side of the belt conveyor 6 at the lower end of the hopper 5 is provided. A scraping plate 5a is preferably provided at a corresponding position. In this case, the distance D2 between the lower end of the scraping plate 5a and the conveyor surface of the belt conveyor ₆ is preferably 500 mm or more and 540 mm or less. If the separation distance D2 is less _than 500 mm, wet raw material ore tends to accumulate or compact at the lower end of the hopper 5, and the lower end may be clogged. The raw material ores described above are likely to be loaded, and there is a risk that the safety device of the drive motor of the belt conveyor 6 will operate and the belt conveyor 6 will stop.

The detection method of the sensor unit 14 is not particularly limited, and a contact type or non-contact type sensor can be used. /OFF is controlled. For example, when a limit switch is used in the sensor part 14, a limit switch striker provided at the end of the rod-shaped part 11 operates the limit switch according to the angle of rotation of the rod-shaped part 11 or separates it from the limit switch. becomes possible.

That is, as shown in FIG. 5(a), when the raw material ore is stably conveyed by the belt conveyor 6, the swinging body 13 of the detector 10 is tilted at an inclination angle θ in the conveying direction, and the rod-shaped portion 11 rotates by the same angle θ, the limit switch striker provided on the rod-like portion 11 can be separated from the limit switch to maintain a state in which the first indicator lamp of the display portion 20 does not output a signal. In this case, the first indicator lamp remains off.

On the other hand, as shown in FIG. 5(b), when the conveying of the raw material ore by the belt conveyor 6 is interrupted, the rocking body 13 of the detector 10 hangs downward, so the limit switch striker provided on the rod-shaped portion 11 is turned to the limit. A signal can be output to the first indicator lamp of the display unit 20 by contacting the switch. In this case, since the first indicator lamp lights up, the operator of the wheel loader W knows that the conveying of raw material ore by the belt conveyor 6 is interrupted, that is, the inside of the hopper 5 is empty. The raw material ore can be quickly put into 1.

The above-described ON/OFF control of the first indicator lamp does not turn on the first indicator lamp while the raw material ore is being conveyed by the belt conveyor 6, so it is possible to prevent the problem of excessive raw material ore being put into the hopper. can be done. That is, if the first indicator lamp is turned off when the transport of the raw material ore by the belt conveyor 6 is interrupted, the operator of the wheel loader W will remove the raw ore from the static grizzly 1 when the first indicator lamp is turned off due to a failure. may continue to be invested in A revolving lamp is preferably used as the first indicator lamp, and its color is preferably different from that of the permission indicator lamp and prohibition indicator lamp of the second indicator lamp, which will be described later.

In addition to the first indicator lamps, the display unit 20 has a second indicator lamp consisting of a permission indicator lamp and a prohibition indicator lamp for indicating the operating state of the belt conveyor 6 . The former permission indicator light is an indicator light that lights up in blue, for example, when the belt conveyor 6 is in operation. On the other hand, the latter prohibition indicator light is an indicator light that lights red, for example, when the belt conveyor 6 stops operating for some reason. As shown in Table 1 below, the operator of the wheel loader W, in addition to the lighting or extinguishing of the first indicator light (rotating light), the lighting status of the permission indicator light and the prohibition indicator light of the second indicator light. By referring to it, the necessity of inputting the raw material ore to the static grizzly 1 is determined.

As shown in Table 1 above, the operator of the wheel loader W loads the raw material ore to the static grizzly 1 only in mode 1 when the permission indicator light is on, the prohibition indicator light is off, and the revolving light is on. throw into. In mode 2, the permission indicator lamp and the prohibition indicator lamp are the same as in mode 1, but since the revolving lamp is turned off, the hopper 5 is only prepared for loading so that the hopper 5 does not overflow. In Modes 3 and 4, the operation of the belt conveyor 6 is stopped for some reason, so the loading work is not performed regardless of whether the revolving light is on or off. EXAMPLES Next, the present invention will be described more specifically with reference to examples and comparative examples.

(Comparative example)
In a hydrometallurgical plant that processes raw ore by the HPAL method, a wheel loader is used to crush and classify nickel oxide ore, which is a raw material ore stored outdoors in a stock pile state, in a pretreatment facility. It was put into the static grizzly of the pretreatment facility. At that time, as shown in FIGS. 6(a) and 6(b), a worker O visually confirms the state inside the hopper 5 and the conveying state of the raw material ore on the belt conveyor 6, and based on the confirmation result, The operator of the wheel loader W was instructed to permit or prohibit loading.

That is, as shown in FIG. 6(a), when the conveying of raw material ore by the belt conveyor 6 is interrupted, the bulletin board "allowed to insert" is raised, and the raw material ore is carried by the belt conveyor 6 as shown in FIG. 6(b). If they were being transported continuously, they were asked to put up a "don't throw in" sign. This means that the operator of the wheel loader W is instructed to charge the raw material ore when all the raw material ore that has been charged is discharged from the hopper 5 and the conveying by the belt conveyor 6 is interrupted.

For the operator of the wheel loader W, in addition to the above-mentioned worker O's signal of "permission to insert" or "prohibition of inserting", an indicator light installed next to the hopper 5 indicating permission to insert or prohibition of inserting raw material ore. After confirming the above, they were asked to decide whether to add or stop the raw material ore. As shown in FIG. 6(a), the input permission indicator light (blue) is lit while the belt conveyor 6 is in operation, and the belt conveyor 6 is stopped as shown in FIG. 6(b). At this time, the indicator light (red) indicating prohibition of turning on is turned on.

As a result, as shown in FIG. 7(a), the worker O made a mistake in visually confirming the state of the raw material ore inside the hopper, and as shown in FIG. 7(b), the worker O and the operator of the wheel loader W Due to human error caused by lack of communication between staff, the raw material ore remained in the hopper 5 and on the belt conveyor 6, but the raw material ore was added by the wheel loader W. As a result, the belt conveyor 6 was overloaded and stopped due to the activation of the safety device. In order to restart the belt conveyor 6, transportation by the wheel loader W was stopped, and it was necessary to manually take out the raw material ore in the hopper 5. Smelting plant production decreased.

(Example)
A transportation status display system consisting of a detector 10 and a display unit 20 as shown in FIG. The operator of the wheel loader W was made to charge the raw material ore to the static grizzly 1 based on modes 1 to 4 shown in . As shown in FIG. 4, the detector 10 has a structure in which three belt-like rocking bodies 13 made of carbon steel and having a width of 50 mm are suspended from a rod-like portion 11 at a distance of 500 mm from each other. The height of the rod-shaped portion 11 is adjusted so that the tip of each rocker 13 and the conveyor surface of the belt conveyor 6 are separated by 50 mm, and when the tilt angle θ of the rocker 13 becomes less than 20°, the display unit 20 is displayed. output a signal to The first indicator lamp of the display unit 20 is Patlite (registered trademark), and the second indicator lamp is the indicator lamp of the comparative example that indicates whether or not to allow or prohibit the charging.

As a result, the raw material ore input interval was 85 seconds on average, which is about 30 seconds shorter than the average input interval of 116 seconds in the case of input based on the instruction by worker O in the above comparative example, as shown in Table 2 below. did it. In addition, the problem of clogging of the hopper 5 due to excessive loading of raw material ore into the hopper 5 due to human error does not occur. In addition, in charging No. 6 of the comparative example, the charging interval became 50 seconds due to an instruction error by the operator O, and the hopper 5 was blocked.

1 static grizzly bear 2 chute 3 vibrating sieve machine 4 oversize chute 5 hopper 5a scraping plate 6 belt conveyor 6a frame 7 leg 8 base 9 side plate 10 detector 11 bar 12 support 13 oscillating body 14 sensor 15 stopper 20 display part W wheel loader O worker

Claims (7)

A detector that detects when the conveying of the raw material ore is interrupted in the belt conveyor that conveys the raw material ore supplied from the lower end of the hopper and outputs a signal, and the light is lit by the signal output from the detector. and a display unit having a first indicator lamp for displaying the operating status of the belt conveyor and a second indicator lamp for displaying the operating status of the belt conveyor. The detector includes a rod-shaped portion extending across the belt conveyor at a position above the belt conveyor and immediately downstream of the lower end of the hopper, and rotatably supporting the rod-shaped portion. A supporting portion, a plurality of swingable oscillating bodies hanging down from the rod-like portion, and an angle of inclination when the oscillating bodies contact the raw material ore conveyed by the belt conveyor is less than a predetermined angle. 2. The transportation status display system according to claim 1, further comprising a sensor unit for detecting a state and outputting a signal. 3. The method according to claim 2, wherein the distance between the tip of the rocking body and the conveyor surface of the belt conveyor is 30 mm or more and 70 mm or less, and the predetermined angle is in the range of 15 to 30 degrees. transportation status display system. 3. The detector further comprises a stopper made of an elastic material that prevents the swinging body from swinging in a direction opposite to the conveying direction of the belt conveyor. The transportation status display system described in . An inclined coarse screen for removing coarse particles contained in the raw material ore, a vibrating screen for sieving the raw material ore that has passed through the coarse screen, and a hopper that temporarily stores the raw material ore that has passed through the vibrating screen. , and a belt conveyor for conveying the raw material ore discharged from the lower end of the hopper, wherein the belt conveyor according to any one of claims 1 to 4. A pretreatment facility for raw material ore, characterized in that a transportation status display system is introduced. A scraping plate for raw material ore is provided at the lower end of the hopper, and a distance between the lower end of the scraping plate and the conveyor surface of the belt conveyor is 500 mm or more and 540 mm or less. Pretreatment equipment for the raw material ore described in . The raw ore pretreatment facility according to claim 5 or 6, wherein the raw ore is a nickel oxide ore having a moisture content of 20% by mass or more and 50% by mass or less.

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