JP6712564B2 - Foreign object detector - Google Patents

Description

The present invention relates to a foreign matter detection device for detecting foreign matter such as bricks mixed in coke in the course of conveying a coke.

In general, coke produced in a coke oven (so-called red hot coke) is once extinguished through a fire extinguishing facility, and then transferred by a conveyor to be shipped. Further, in the case where a coke manufacturing facility and an iron making facility are provided side by side, after the fire is extinguished, the coke is directly put into the raw material inlet of the blast furnace for iron making from the conveyor.

By the way, in such a coke manufacturing process or a fire extinguishing process, the bricks forming the wall surface of the coke oven or the fire extinguishing equipment may deteriorate with time and fall off to be mixed into the coke. In addition, when the coke raw material is charged or the product is taken out, a part (metal piece or the like) of the work machine may be lost or fallen and mixed into the coke.

If such foreign matters such as metal pieces and bricks are mixed, the quality of the final product using coke will be reduced and it will be a problem at the shipping destination where coke is used as a raw material or in the blast furnace where the coke is directly fed. However, if a large foreign matter is mixed in, there is a risk of causing a large amount of damage by causing malfunctions of various equipment machines or an emergency stop due to the foreign matter being caught.

Therefore, it is important to detect and remove the foreign matter mixed in the coke before the coke is discharged to the shipping destination or before the coke is put into the blast furnace. I try to remove foreign objects. Also, some technologies have been proposed that automatically detect the mixing of foreign matter by utilizing a vibration sensor or X-rays without relying on visual observation.

For example, as shown in FIG. 3, impact vibration measuring means 4 is attached to a chute part 3 for carrying out coke, which is connected to the end of a conveyor 2 for conveying coke 1, and a vibration receiving plate 4 a of this impact vibration measuring means 4 is attached. There has been proposed a foreign matter detection device that detects a difference between collision signals of the coke 1 and the foreign matter 5 that collide with each other (see Patent Document 1). In FIG. 3, reference numeral 6 is a first processing unit that converts impact vibration into an electric signal and outputs a vibration detection signal, and 7 receives the vibration detection signal and stores reference data and the vibration detection signal that are stored in advance. And a second processing unit that outputs a foreign matter detection signal when it is determined that the shock vibration due to the foreign matter deviates from the reference data.

Further, as shown in FIG. 4, an X-ray irradiator 8 for irradiating X-rays from above the transfer conveyor 2 is provided in the middle of the transfer conveyor 2 for transferring the coke 1, and the coke 1 is provided below the transfer conveyor 2. There is also proposed a foreign matter detection device that is provided with an X-ray intensity measuring means 9 for measuring the intensity of X-rays that have passed through, and detects the foreign matter 5 based on the difference in the intensity of transmitted X-rays (see Patent Document 2). ). In FIG. 4, reference numeral 10 denotes a personal computer (PC) including a processing unit that determines the presence or absence of the foreign matter 5 based on the measurement data output from the X-ray intensity measuring means 9.

JP, 9-95674, A JP, 2006-267067, A

However, the foreign matter detection device shown in FIG. 3 measures the impact vibration when the coke 1 or the foreign matter 5 that falls obliquely hits the vibration receiving plate 4a and determines the difference, and therefore the falling posture of the foreign matter 5 and the coke 1 between themselves. However, there is a problem in that the accuracy of foreign matter detection is not sufficient due to variations in measured values due to simultaneous collisions of the above. Further, even if the conveyance of the coke 1 is stopped at the time when the foreign matter is detected, the detected foreign matter 5 is dropped into the chute 3 together with the coke 1, and there is a problem that it takes time to take out the foreign matter 5. Further, since the impact vibration measuring means 4 is relatively expensive, there is also a problem that the entire apparatus becomes relatively expensive.

Further, the foreign matter detection device shown in FIG. 4 utilizes a difference in X-ray transmittance, and if the difference is significantly different, it can be detected with high accuracy. However, the difference between the brick and the coke 1 is large. Is small, it is difficult to detect bricks mixed in the coke 1. In order to improve the foreign matter detection accuracy, the resolution of the sensor portion that recognizes the difference in X-ray transmittance must be increased and the information processing capability of the PC must be increased, which causes a problem that the apparatus becomes more expensive. Moreover, even though the device has been extinguished, it is necessary to install it relatively close to the coke 1 that is still at a high temperature (for example, 150 to 200° C.), and thus the performance of the device tends to deteriorate with time due to heat. There is a problem.

As described above, the conventional foreign matter detection device is not sufficient in terms of cost and detection accuracy, and has a simple structure and low cost, yet has high detection accuracy and excellent durability. There is a strong demand for the provision of equipment.

The present invention has been made in response to such a problem, and an object of the present invention is to provide a foreign matter detection device that has a simple structure and low cost, yet has high detection accuracy and excellent durability.

In order to meet the above-mentioned problems, the present invention is a foreign matter detection device provided in the midway of a carrying conveyor for carrying coke, and is installed so as to cross the carrying conveyor at a predetermined height from the carrying surface of the carrying conveyor. The foreign matter detection unit that detects the foreign matter by contacting the foreign matter protruding from the transport surface of the transport conveyor to a predetermined height or more and causing a physical change, and whether there is a physical change in the foreign matter detection unit. Continuously measured, comprising a conveyer control unit set to output an instruction signal to stop the conveyer when a foreign substance is detected by a physical change of the foreign substance detection unit, the foreign matter detection unit, A rigid structure having a vertical side portion that hangs from above the transport conveyor and a lateral side portion that is attached to the lower end thereof and that crosses the transport conveyor at a predetermined height from the transport surface of the transport conveyor, and the horizontal side portion is a foreign substance. Is contacted with and pushed to the downstream side of the conveyor to change the posture of the vertical side portion, and the conveyor conveyer control unit continuously changes the posture of the vertical side portion in the foreign matter detection unit. The foreign substance detection device adapted to measure the above is the first gist.

And the present invention makes the foreign substance detection device provided with a chute switch the second gist of the invention in order to measure the change in the posture of the vertical side portion, in particular, in the transfer conveyor control unit. Among them, the third gist is a foreign matter detection device in which the height of the lateral side portion of the foreign matter detection section above the transport surface of the transport conveyor is adjustable.

That is, the foreign matter detection device of the present invention, the foreign matter detection unit is installed so as to cross the transport conveyor at a predetermined height from the transport surface of the transport conveyor that transports coke, and protrudes from the transport surface of the transport conveyor to a predetermined height or more. The foreign matter is detected by bringing the foreign matter into contact with the foreign matter and causing a physical change such as changing its position or posture. Then, the presence/absence of a physical change in the foreign matter detection unit is continuously measured, and when the foreign matter is detected by the physical change in the foreign matter detection unit, an instruction signal to stop the conveyor is set to be output. A transfer conveyor control unit is provided to immediately stop the transfer conveyor when a foreign substance is detected.

According to the above configuration, when the granular coke is being conveyed and a relatively large foreign matter such as an angular brick is projected above the surface height of the coke, the foreign matter is detected by the foreign matter detection unit. It is designed to come into contact with directly. Then, the physical change of the foreign matter detector is clearly measured by the contact, so that the foreign matter can be reliably detected. Since the device of the present invention has a simple structure, it can be provided at low cost.

Further, according to the configuration of the present invention, when the foreign matter detection unit detects a foreign matter, the transport conveyor is immediately stopped, so immediately remove the foreign matter from the transport conveyor on the spot. If the transport conveyor is restarted, the time loss can be minimized and the work on the downstream side will not be hindered.

Further, according to the configuration of the present invention, the fact that the foreign matter detector contacts the foreign matter and changes its posture or the like is measured by the conveyor control unit, which is separate from the foreign matter detector, and therefore has coke with heat. The transfer conveyor can be controlled at a position distant from the vicinity of the transfer section, and is not thermally affected. Therefore, there is an advantage that the detection accuracy is unlikely to decrease over a long period of time.

And, in the present invention , in particular, the foreign matter detection unit is a vertical side portion that hangs down from above the transport conveyor, and a horizontal side portion that is attached to the lower end and crosses the transport conveyor at a predetermined height from the transport surface of the transport conveyor. comprising a rigid structure having said lateral side portion is pushed to the downstream side of the conveyor in contact with foreign objects is adapted to change the attitude of the vertical side portion, the conveyor control unit, the since adapted to continuously measure the change in the attitude of the vertical side portion of the foreign object detection section, especially with a simple configuration, Ru can be performed reliably detect foreign matter.

Further, among the present invention, in particular, in the transfer conveyor control unit, in order to measure the change in the posture of the vertical side part, a chute switch is provided, at the same time as the detection of the foreign matter, the chute switch. Since the stop signal of the conveyer is immediately output by the above, it is preferable that a labor for forming a logic circuit for receiving the foreign matter detection signal and outputting the stop signal of the conveyer is omitted.

Further, among the present invention, in particular, the height of the lateral side of the foreign matter detection unit from the transport surface of the transport conveyor is adjustable, at the site where this foreign matter detection device is installed, Considering the size of the coke, the amount of conveyance, the size of the foreign matter to be removed, and the like, the height of the lateral side of the foreign matter detection unit can be adjusted to an optimum height, which is preferable.

(A) is explanatory drawing which shows typically the foreign material detection apparatus which is one embodiment of this invention, (b) is an AA' arrow line view of (a). It is explanatory drawing of the detection operation in the said foreign material detection apparatus, (a) is BB' sectional drawing of FIG. 1(a), (b) is CC' arrow view of FIG. 1(a). It is explanatory drawing which shows an example of the conventional foreign material detection apparatus typically. It is explanatory drawing which shows typically the other example of the conventional foreign material detection apparatus.

Next, modes for carrying out the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

FIG. 1 shows a foreign matter detection device according to an embodiment of the present invention. This foreign matter detection device is installed on a base plate 20 that is provided so as to straddle a conveyor 2 that conveys the coke 1 from the back side to the front side in the direction perpendicular to the paper surface. The conveyor 2 is horizontally laid horizontally on columns (not shown) vertically provided on both left and right sides of the conveyor 2.

That is, an opening 30 is formed in the center of the base plate 20, and a pair of left and right brackets 22 are provided on both sides of the opening 30. A horizontally extending guide shaft 23 is rotatably supported via the bracket 22, and the foreign matter detector 21 of the foreign matter detector is attached downward from the center of the guide shaft 23.

More specifically, the foreign matter detection unit 21 includes a vertical side portion 24 that hangs down from the center of the guide shaft 23, and a horizontal side portion 25 that is attached to the lower end of the guide shaft 23 and that crosses the transport conveyor 2. Reference numeral 24 denotes a first vertical side portion 24a hanging from a boss portion 26 integrally attached to the guide shaft 23, and a second vertical side portion connected to the first vertical side portion 24a by screw fixing. 24b and. The first vertical side portion 24a, the second vertical side portion 24b, and the horizontal side portion 25 are all made of a rigid body made of stainless steel, and the second vertical side portion 24b and the horizontal side portion 25 are It is fixed integrally by welding.

As shown in FIG. 1B, which is an AA′ arrow view of FIG. 1A, the first vertical side portion 24a is for screw fixing to the second vertical side portion 24b. The long hole 50 is provided, and the height H of the horizontal side portion 25 attached to the lower end of the second vertical side portion 24b from the transport surface of the transport conveyor 2 is adjusted by adjusting the screw fixing position. You can do it. The height H is adjusted on the spot in consideration of the size and amount of the coke 1 conveyed by the conveyor 2 and the protrusion height of the foreign matter to be detected.

The left and right ends of the lateral side portion 25 are bent obliquely upward in accordance with the curved surface of the transport conveyor 2, and are provided at two left and right positions inside the bent ends. A metal fitting 27 for attaching the chain is provided. Further, metal fittings 31 for attaching a chain are provided at the edges of the openings 28 provided at two positions on the left and right of the base plate 20, and the chain 32 hung from the metal fitting 31 prevents the foreign matter detection unit 21 from falling. Is being made. In addition, below the transport conveyor 2, three feed rollers 51 arranged side by side are provided at predetermined intervals along the longitudinal direction of the transport conveyor 2.

As described above, the foreign matter detection unit 21 is suspended on the base plate 20 from the guide shaft 23 that is rotatably supported, and the cross section taken along the line BB′ of FIG. As shown in FIG. 2A, when foreign matter 5 such as brick is mixed in the coke 1 and protrudes upward from the surface of the coke 1, the foreign matter 5 hits the lateral side portion 25 of the foreign matter detecting unit 21. It is being detected.

On the other hand, as shown in FIG. 2B, a vertically long lever piece 35 is integrally attached to one end of the guide shaft 23 on the base 20, and the lever piece 35 projects laterally. The hit block 36 is attached [see FIG. 1(a)]. Further, a chute switch 38 is provided via a bracket 37 so as to be adjacent to the hit block 36.

The chute switch 38 functions as a conveyor control unit, and a pressure-sensitive plate 38a is formed on one surface of the chute switch 38 in a protruding manner. When a pressure higher than a certain level is applied to the pressure-sensitive plate 38a, an instruction signal for stopping the conveyor 2 is provided. Is set to output. In FIG. 1, reference numeral 60 denotes a drive controller of the conveyor 2 electrically connected to the chute switch 38.

Therefore, as shown in FIG. 2A, the foreign matter 5 such as brick is mixed in the coke 1, and the foreign matter 5 is conveyed together with the coke 1 in a state of protruding above the surface of the coke 1 to detect the foreign matter detecting section 21. When the foreign matter 5 such as bricks is heavy and does not flow like the coke 1 when it comes into contact with the lateral side section 25 of the above, the lateral side section 25 of the foreign matter detecting section 21 tries to be pushed out to the downstream side.

At this time, as shown in FIG. 2B, the vertical side portion 24 of the foreign matter detection unit 21 tries to move as shown by a thick arrow X at its root side. On the other hand, the upper portion of the lever piece 35 integrally attached to the rotatable guide shaft 23 tries to move as indicated by the thick arrow Y. With this operation, the hit block 36 attached to the upper portion of the lever piece 35 presses the pressure sensitive plate 38a of the chute switch 38. When this pressing force exceeds a preset pressure, the chute switch 38 outputs an instruction signal to stop the conveyor 2 and an instruction from the drive control unit 60 of the conveyor 2 which has received the instruction signal. As a result, the transport conveyor 2 is immediately stopped.

Then, the worker removes the foreign matter 5 from the stopped transport conveyor 2 and presses a recovery button (not shown), whereby the transport of the coke 1 is restarted.

As described above, according to the foreign matter detection device, foreign matter such as bricks can be reliably and promptly detected during transportation by the conveyor 2 before the coke 1 is shipped or before the coke 1 is loaded into the blast furnace. Can be removed. Therefore, it is possible to solve the problems such as an emergency stop due to foreign matter being caught in a shipping destination or an iron making operation in a blast furnace, and a deterioration in quality of a final product, which have been conventionally problems.

Moreover, the foreign matter detection device has a simple device configuration and can keep the manufacturing cost low. Further, by adjusting the height of the lateral side portion 25 of the foreign matter detection unit 21, the foreign matter 5 having a certain size or more can be detected without fail, and the detection accuracy is high. When the coke 1 is simply piled up and protrudes high, the coke 1 is flattened by its own fluidity even when it comes into contact with the lateral side portion 25, so that the pressure sensitive plate 38a of the chute switch 38 is formed. There is no load on the device and no malfunction occurs.

Further, although the foreign matter detection device has the foreign matter detection unit 21 for contacting the foreign matter 5 hung on the conveyor 2, the foreign matter detection unit 21 detects a change in posture of the foreign matter detection unit 21 and transmits the change to the chute switch 38. Since the drive control unit 60 and the like of the transport conveyor 2 that receives the stop instruction of the transport conveyor 2 from the chute switch 38 are installed at a higher position above the transport conveyor 2, the heat of the coke 1 to be transported is increased. It has the advantage that it is unlikely to be affected by factors such as the above, and the quality can be maintained for a long period of time.

In the above example, the height H of the lateral side portion 25 of the foreign matter detection unit 21 from the transport surface of the transport conveyor 2 [see FIG. 1(a)] is the shape of the transport conveyor 2 and the foreign matter of interest. Detecting bricks (width 20 to 24 cm x height 10 to 30 cm x thickness 10 to 13 cm) that are often mixed as foreign matter 5, depending on the size of 5, the size of coke 1 and the transport amount per unit time. In general, it is preferable to set it to about 10 to 50 cm, especially about 15 to 30 cm. Then, it is preferable to adjust so that there is a gap of about 5 to 20 cm between the surface of the layer of the coke 1 to be conveyed and the lower surface of the lateral side portion 25 in the state of being installed on site. However, it is more preferable to adjust it to be about 8 to 15 cm. That is, if the gap between the two is too wide, the foreign matter 5 such as bricks may not be detected depending on its posture, and if it is too narrow, malfunction may occur when the coke 1 is layered. Absent.

In the above example, the pressure sensitive plate 38a of the chute switch 38 measures the movement of the lateral side portion 25 of the foreign matter detection unit 21 in contact with the foreign matter 5 and the vertical side portion 24 being pushed downstream. Although the contact type is used [see FIGS. 2A and 2B], the magnetic proximity type may be used instead of the contact type. Instead of the shoot switch 38, a general pressure sensor, acceleration sensor, displacement sensor, or the like may be used. However, when these sensors are used, it is necessary to set in advance to output the stop signal of the conveyor 2 based on the detection signal output from the sensor. On the other hand, since the chute switch 38 used in the above example is preset to output a stop signal for stopping the conveyor 2 when the pressure sensitive plate 38a feels a certain pressure or more, it is used in the present invention. Suitable for

Further, when the horizontal side portion 25 of the foreign matter detection unit 21 comes into contact with the foreign matter 5 and the vertical side portion 24 is pushed to the downstream side, in the above example, the movement is hit against the pressure sensitive plate 38a of the chute switch 38 to block the block 36. Although the movement is limited by applying the foreign matter 5, the movement itself may be read by an optical sensor or the like to detect the foreign matter 5.

That is, as shown by the alternate long and short dash line in FIG. 1B, when the vertical side portion 24 is pushed downstream and reaches the position P, the light emitting unit and the light receiving unit of the optical sensor are sandwiched so as to sandwich the position P. Install (not shown). Then, the light receiving side may be set to always read the light, and the foreign object detection signal may be set to be output when the vertical side portion 24 moves and the light is blocked at the position P. Alternatively, an optical sensor is installed so that light is always blocked by the hanging vertical side portion 24, and when the vertical side portion 24 moves to the position P and the light reaches the light receiving unit, a foreign object detection signal is output. You may. As described above, the method of reading the change in the vertical side portion 24 by the sensor may be set in any manner.

Further, in the above example, the vertical side portion 24 of the foreign matter detecting unit 21 is a combination of the first vertical side portion 24a and the second vertical side portion 24b, and the vertical fixing side is changed by changing the screw fixing positions of both. Although the height H of the horizontal side portion 25 attached to the lower end of the portion 24 is adjustable, the method of adjusting the height H of the horizontal side portion 25 is not limited to the above example, and an appropriate method may be adopted. it can. In addition, if the conditions for carrying the coke 1 and the like are predetermined and adjustment on site is not necessary, it is not always necessary to configure the vertical side portion 24 with two parts so that the length can be adjusted freely.

Further, in the above-mentioned example, the left and right chains 32 prevent the foreign matter detector 21 from falling off, but this is provided for safety. When the attachment of the vertical side portion 24 to the guide shaft 23 and the attachment of the horizontal side portion 25 to the vertical side portion 24 are firmly performed, the suspension assist by the chain 32 is not necessarily required.

The foreign matter detection device of the present invention is suitable for removing foreign matter such as bricks from coke during transportation, and has a simple structure and low cost as well as high detection accuracy, and as a foreign matter detection device excellent in durability. Can be widely used.

1 Coke 2 Conveyor 21 Foreign matter detector 38 Chute switch

Claims (3)

A foreign matter detection device provided in the middle of a transport path of a transport conveyor that transports coke,
It is installed so as to cross the transport conveyor at a predetermined height from the transport surface of the transport conveyor, and detects foreign matter by contacting foreign matter protruding from the transport surface of the transport conveyor at a predetermined height or more and causing a physical change. Foreign matter detection unit,
A conveyor conveyer set to continuously measure the presence/absence of a physical change in the foreign matter detector and output an instruction signal to stop the conveyor when a foreign matter is detected due to a physical change in the foreign matter detector. And a control unit ,
The foreign matter detection unit comprises a rigid structure having a vertical side portion that hangs from above the transport conveyor, and a horizontal side portion that is attached to the lower end and crosses the transport conveyor at a predetermined height from the transport surface of the transport conveyor, The horizontal side portion is contacted with foreign matter and is pushed to the downstream side of the conveyor so that the posture of the vertical side portion is changed,
A foreign matter detection device, wherein the transport conveyor control unit is configured to continuously measure a change in posture of a vertical side portion of the foreign matter detection unit. In the conveyor control unit, in order to measure changes in attitude of the vertical side portion, the foreign matter detecting apparatus according to claim 1, wherein the chute switches are provided. The foreign matter detection device according to claim 1 or 2 , wherein a height of a lateral side portion of the foreign matter detection unit from a transportation surface of a transportation conveyor is adjustable.

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