JP5986321B2 - Steel plate scale thickness measuring device - Google Patents

Description

  The present invention relates to an apparatus for measuring the scale thickness of a steel sheet, and more particularly to an apparatus for measuring the scale thickness of a steel sheet capable of accurately measuring the scale thickness of the steel sheet online.

  The scale on the surface of the steel sheet formed at a high temperature plays a role in preventing oxidation from progressing inside the steel sheet. However, if the thickness of the scale becomes too thick, the scale is mixed during welding work, resulting in poor welding. There's a problem. In addition, the adhesive strength is reduced, the scale peels off and rust is generated, which causes problems affecting the quality of the product.

  Therefore, it is important to produce the product by deriving the optimum process for reducing the thickness of the scale in the steel plate or plate manufacturing factory. Since it must be removed by shot blasting or the like, it is an important issue to accurately measure the thickness of the scale during the manufacturing process.

  In order to measure the thickness of the scale, there is a method of taking a sample, polishing the cross section, and observing with a microscope, but this method requires a lot of time and is a destructive method. It is impossible to measure by incorporating it inside. On the other hand, a method using a portable measuring machine using a magnetic induction type measuring sensor can also be measured when a sample can be collected at room temperature, but cannot be incorporated into a manufacturing process line and measured. .

  Furthermore, there are laser ultrasonic methods and microwave or X-ray diffraction methods as non-contact measurement methods, but the measurement accuracy is not sufficient for use in the manufacturing process, and is not applicable. There is a problem that there is.

  The subject of this invention is providing the apparatus which can measure the scale thickness of a steel plate correctly on-line.

  A scale thickness measurement apparatus according to an embodiment of the present invention includes a transfer device that moves a steel plate having a predetermined width, a frame disposed above the transfer device, and a time when the transfer device is stopped when connected to the frame. A plurality of detection devices that descend and measure the scale thickness of the steel plate; and a control unit that calculates the scale thickness of the steel plate based on the plurality of thickness measurement values received from the detection device.

  In the scale thickness measurement apparatus according to the embodiment of the present invention, the control unit may receive information related to the steel plate in advance and adjust the separation distance between the plurality of detection devices according to the width of the steel plate.

  In the scale thickness measurement apparatus according to the embodiment of the present invention, the detection device includes a body unit connected to the frame, a measurement head that contacts the steel plate, and a drive unit that is fixed to the body unit and raises / lowers the measurement head. And including.

  In the scale thickness measuring apparatus according to the embodiment of the present invention, the measuring head is coupled to the drive unit so as to be able to rotate back and forth and right and left.

  The scale thickness measurement apparatus according to an embodiment of the present invention includes a damping structure that is coupled between the measurement head and the driving unit and maintains a constant pressure applied to the steel plate by the measurement head.

  In the scale thickness measurement apparatus according to the embodiment of the present invention, the damping structure includes a guide portion and a slide portion that slides on the guide portion, and the slide portion is driven after the measurement head is lowered and contacts the steel plate. You may slide to a guide part only for the descent | fall distance of a part.

  In the scale thickness measurement apparatus according to the embodiment of the present invention, the maximum slide distance of the slide part may be formed larger than the maximum descending distance of the measurement head.

  In the scale thickness measurement apparatus according to the embodiment of the present invention, the measurement head includes a movement detection sensor that detects the operation of the transfer device, and the control unit measures if the movement of the transfer device is detected by the movement detection sensor. A control signal may be output to the drive unit so as to raise the head.

  In the scale thickness measuring apparatus according to the embodiment of the present invention, the measuring head includes a head housing and a plurality of measuring sensors inserted into the head housing and having the ends exposed to the outside of the head housing and contacting the steel plate. .

  The scale thickness measurement apparatus according to the embodiment of the present invention includes a temperature sensor disposed inside the head housing, and the controller may correct the scale measurement value according to the internal temperature received from the temperature sensor. good.

  In the scale thickness measurement apparatus according to the embodiment of the present invention, the control unit controls the drive unit to raise the measurement head when the internal temperature measured by the temperature sensor exceeds a preset critical value. A signal may be output.

  In the scale thickness measuring apparatus according to the embodiment of the present invention, a channel may be formed in the outer wall of the head housing, and a cooling gas may circulate in the channel.

  The scale thickness measuring apparatus according to the embodiment of the present invention includes an emergency cylinder disposed between the body part and the frame, and the control unit outputs an output signal to the emergency cylinder to raise the body part in an emergency. You may apply.

  In the scale thickness measuring apparatus according to the embodiment of the present invention, the rising height of the body portion by the emergency cylinder may be formed higher than the maximum descending height of the measurement header by the driving unit.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to measure rapidly the scale thickness of a steel plate or a thick board in a manufacturing process, and can measure the scale thickness of all the products produced rapidly.

  Therefore, not only can it be used to derive the process factors that affect the scale thickness, but by selecting only products with a large scale thickness and performing subsequent processes such as shot blasting, the process load can be reduced. The advantage is that only products that are uniform and not thick can be sorted and shipped.

It is a conceptual diagram of the scale thickness measuring apparatus by one Embodiment of this invention. It is a perspective view of the detection apparatus by one Embodiment of this invention. It is a modification of the detection apparatus in FIG. It is another modification of the detection apparatus in FIG. It is a partial cross section figure of the measurement header of the detection apparatus by one Embodiment of this invention. It is a figure which shows the state by which the detection apparatus of the scale thickness measuring apparatus by this invention was mounted in the steel plate of a non-flat surface. It is a conceptual diagram which shows operation | movement of the detection apparatus by one Embodiment of this invention. It is a block diagram of the scale thickness measuring apparatus by one Embodiment of this invention.

While the invention is amenable to various modifications and alternative forms, specific embodiments have been illustrated in the drawings and will be described in detail in the Detailed Description section.
However, this is not intended to limit the present invention to only specific embodiments, and the present invention is understood to include all modifications, equivalents or alternatives that fall within the spirit and scope of the present invention. Must.

  In the present invention, terms such as “including” or “having” are intended to designate the presence of features, numbers, steps, operations, components, parts or combinations thereof described in the specification. It should be understood that it does not exclude the presence or possibility of adding one or more other features or numbers, steps, actions, components, parts or combinations thereof.

  The drawings attached in the present invention should be understood as being enlarged or reduced for convenience of explanation.

  The present invention will be described in detail with reference to the drawings, and the same reference numerals are given to the same or corresponding components regardless of the reference numerals, and a duplicate description thereof will be omitted.

FIG. 1 is a conceptual diagram of a scale thickness measuring apparatus according to an embodiment of the present invention.
The scale thickness measuring device according to the present invention is connected to a transfer device 100 for moving a steel plate having a predetermined width, a frame 200 disposed above the transfer device 100, the frame 200, and the transfer device 100 stops. A plurality of detection devices 300 that descend in time to measure the scale thickness of the steel plate, and a control unit that calculates the scale thickness of the steel plate according to a plurality of thickness values received from the detection device 300 are included.

  The transfer apparatus 100 transfers a steel plate in one direction with a predetermined width and length. Such a transfer device 100 may be a conveyor belt having an endless track, or any other configuration that can transfer a steel plate in one direction by various other configurations. Generally, the transfer device 100 is stopped at predetermined intervals in order to form an identification mark or the like on the steel plate.

  The frame 200 is a structure for arranging the detection device 300 above the transfer device 100, is formed in a bar shape, and is arranged above the transfer device 100. Thereby, the steel plate A moved by the transfer device 100 passes through the frame 200.

  The detection device 300 is attached to the frame 200, is disposed above the transfer device 100 in the standby mode, and descends when detecting mode is detected to detect the thickness of the steel sheet scale. A plurality of detection devices 300 may be configured, and are arranged at an appropriate interval corresponding to the width of the steel plate.

  The detection apparatus 300 includes a body unit 310 connected to the frame 200, a measurement head 330 that contacts the steel plate A, and a drive unit 320 that is fixed to the body unit 310 to raise / lower the measurement head 330.

  The body portion 310 is connected to the frame 200 and is configured to be movable in the width direction of the steel plate (y direction in FIG. 1). The body part 310 may include a moving member (not shown) for moving in the width direction, and the moving member may include a rack gear and a motor. Thereby, since each detection apparatus 300 can move to an appropriate position according to the width of the steel plate, even when the width of the steel plate is changed, the scale thickness between the edge portion and the center portion of the steel plate A is effectively used. Can be detected. Therefore, there is an advantage that the scale thickness can be accurately measured even if the type and width of the steel plate are changed.

  The driving unit 320 is fixed to the body unit 310 and can select all of various configurations for raising / lowering the measuring head 330. For example, the measurement head 330 can be raised / lowered using a hydraulic cylinder, a motor and a rack gear, or the like.

  The measuring head 330 is spaced apart from the steel plate A at a predetermined interval in the standby mode, and measures the scale thickness of the steel plate by being lowered by the driving unit 320 and in contact with the steel plate A in the measuring mode. Thereafter, when the measurement is completed, the transfer device 100 is raised before the operation again, and the measurement head 330 prevents the steel plate from being damaged.

  With this configuration, it is much more efficient and accurate to measure the scale thickness of the steel plate online compared to the conventional method in which an observer directly applies a portable scale measuring device to the steel plate to measure the scale thickness. be able to.

FIG. 2 is a perspective view of a detection device according to an embodiment of the present invention, and FIGS. 3 and 4 are modifications of the detection device shown in FIG.
As shown in FIG. 2, in the detection apparatus according to the present invention, a damping structure 340 is disposed between the measurement head 330 and the driving unit 320. Such a damping structure 340 serves to adjust the pressure applied to the steel plate by the measuring head 330. Specifically, the damping structure 340 includes a guide portion 342 and a slide portion 341 that slides on the guide portion 342.

  As shown in FIG. 2A, the slide portion 341 maintains the maximum separation distance from the guide portion 342 by the load of the measurement head 330. As shown in FIG. When the drive unit 320 further descends after coming down and contacting the steel plate, the pressure applied to the steel plate can be adjusted by sliding the guide unit 342 by the descending distance of the drive unit 320. Thereby, it can prevent that an indentation produces | generates in a steel plate when a steel plate is pressurized too much by the measuring head 330, and quality falls.

  Specifically, the guide part 342 can be combined with the measuring head 330 to form a long hole 342a in the upward / downward direction, the slide part 341 is connected to the end of the driving part 320, and the protruding pin 341a is the long hole. The measuring head 330 is inserted into the 342a and moved in the ascending / descending direction along the long hole 342a.

  At this time, since the projecting pin 341a can be rotated while being inserted into the long hole 342a, the measuring head 330 can move forward and backward with respect to the moving direction of the driving unit 320. Accordingly, even if the steel plate moves while the measuring head 330 is lowered, it is possible to prevent the steel plate from being scratched and to effectively adhere to the steel plate even when the steel plate is not a flat surface when lowered.

  At this time, even when the driving unit 320 excessively lowers the measuring head 330, the maximum sliding distance by which the slide unit 341 slides on the guide unit 342 is prevented in order to prevent the measuring head 330 from colliding with the steel plate and applying an impact. The length of the long hole is preferably designed to be larger than the maximum descending distance of the driving unit 320. This can be realized by forming the length of the long hole 342a longer than the maximum descending distance of the driving unit 320.

  According to the above configuration, even if the driving unit 320 lowers the measuring head 330 to the maximum due to a failure or the like, the pressure applied to the steel plate is maintained only by the load of the measuring head 330. The occurrence of defects is prevented.

  At this time, it has been described that the slide unit 341 is coupled to one side of the driving unit 320 and the guide unit 342 is coupled to one side of the measurement head 330, but conversely, the slide unit 341 is coupled to one side of the measurement head 330. The guide unit 342 may be coupled to one side of the driving unit 320. Further, the damping structure can be variously modified as long as the above-described configuration can be realized.

  For example, as shown in FIG. 3, in the damping structure 350, a hole 352a is formed in the guide portion 352, and a ball 351a fitted in the hole 352a is formed in the slide portion 351, whereby the measuring head 330 is formed. However, it can freely rotate back and forth and right and left with respect to the drive unit 320. Accordingly, since the measuring head 330 can be configured to rotate at the same time as the pressing force is adjusted by the damping structure 350 without providing a separate rotating member, there is an advantage that the number of parts is reduced.

  As shown in FIG. 4, the damping structure 360 is formed of a guide plate 361 coupled to the driving unit 320 and a slide plate 362 coupled to the measurement head 330, and is formed on the upper portion of the slide plate 362. The projecting pin 362a can be configured to slide by being fixedly inserted into the hole of the guide plate 361. At this time, an elastic member 362b such as a spring may be coupled to the projecting pin 362a so that the measuring head 330 is in close contact with the steel plate.

  As shown in FIG. 5, the measurement head 330 includes a head housing 331 and a plurality of measurement sensors 332 that are inserted into the head housing 331 and whose ends are exposed to the outside of the head housing 331 and are in contact with the steel plate.

  The head housing 331 has a space therein and is formed in a shape that stands up with respect to the steel plate. A plurality of measurement sensors 332 are arranged at uniform intervals in the internal space, and a substrate 333 is coupled to the bottom surface of the head housing 331 to seal the internal space. The measurement sensor 332 is fixed to the substrate 333, and the end is exposed to the outside. The substrate 333 may be made of the same material as that of the head housing 331, and is preferably made of a material particularly excellent in heat shielding performance.

  As the measurement sensor 332, any of various sensors capable of measuring the scale thickness of the steel sheet can be selected, but a magnetic induction sensor capable of quick and accurate measurement even at a relatively high temperature can be selected. Below, although the example which uses a magnetic induction sensor as the measurement sensor 332 is demonstrated, it is not necessarily limited to this.

  In the magnetic induction sensor 332, a magnetic induction coil is wound around a soft magnetic core in the center, and a plurality of sensors are arranged with detection coils wound around the upper and lower portions thereof. At this time, if the number of sensors arranged in each detection device is too small, the average value of the scale thickness values cannot be expressed accurately, and the deviation increases depending on the measurement position. Preferably 10 to 10 sensors are arranged. A frequency of several kHz band is applied to the magnetic induction sensor, and a value obtained by differentially amplifying voltages induced from two detection coils centered on the soft magnetic core is converted into a scale thickness.

  An elastic member 337 such as a spring is coupled between the exposed portion of the measurement sensor 332 and the substrate 333, so that sufficient adhesion can be provided when the end surface of the sensor and the steel plate are in close contact. In addition, the coupling member 336 that couples the substrate 333 and the head housing 331 is formed of an elastic material, and an elastic pad 334 is disposed on the exposed surface of the substrate so that an excessive amount applied to the sensor 332 when the head housing 331 contacts the steel plate. The pressure can be dispersed.

  A temperature sensor 335 is attached inside the head housing 331. A circuit board for oscillation, reception and amplification is attached inside the head housing 331, and a plurality of semiconductor elements are arranged on the circuit board. As a result, the voltage fluctuates according to the temperature inside the head housing 331 and affects the measured value. Accordingly, the temperature sensor 335 measures the temperature at a predetermined time inside the head housing 331 and transmits it to the control unit, or measures the temperature and transmits it to the control unit when receiving a detection signal from the control unit.

  Since the steel plate is relatively hot, there is a problem that the internal temperature of the head housing suddenly rises upon contact and accurate measurement cannot be performed. Therefore, the outer wall of the head housing 331 is formed of a double wall, and a channel 331a for circulating the refrigerant is formed, so that a rapid temperature rise inside the head housing is prevented by the refrigerant.

  The channel 331a may be configured to circulate the cooling gas, but it is further preferable that the cooling gas circulates through the substrate 333 and is discharged between the measurement sensors 332 as shown in FIG. In this case, it is possible to prevent excessive heat from being applied to the measurement sensor 332 by the cooling gas, and it is possible to reduce the temperature of the steel plate to which the measurement sensor 332 is in close contact, so that accurate detection is possible. .

  Therefore, the substrate 333 communicates with the channel 331a of the head housing, and the sub-channel 333a is formed in the lateral direction. The through-nozzle 333b is connected to the sub-channel 333a of the substrate and formed between the mounting positions of the sensor 332. , Can be included.

  Further, the measurement head 330 can include a movement detection sensor (not shown) on the surface that is in close contact with the steel plate. Such a movement detection sensor is composed of a proximity sensor or the like, and detects and transmits this to the control unit when the steel plate moves while the measuring head and the steel plate are in close contact with each other.

FIG. 6 is a view showing a state in which the detecting device of the scale thickness measuring device according to the present invention is placed on a non-flat steel plate.
As shown in FIG. 6, when three detection devices 300 are arranged on the frame 200, the second detection device 300a arranged on the left side surface is scaled compared to the first detection device 300b arranged in the center. Even if the thickness of S is relatively large, the same pressing force as that of the first detection device 300b can be maintained by sliding (d) the above-described damping structure.

  Further, even when the steel plate A is a non-flat surface as in the third detection device 300c disposed on the right side with respect to the first detection device 300b, the measurement head 330 rotates by a predetermined angle θ with respect to the drive unit 320. Thus, it can be seen that it can be in close contact with the steel sheet A.

  That is, according to the embodiment of the present invention, even if the steel plate thickness is different in the width direction or the surface is non-flat, the measurement head 330 is arranged in close contact with a constant pressure, so that the scale thickness can be accurately measured. Can be calculated. In addition, since the plurality of detection devices 300 measure the thickness value in the width direction, a more accurate scale thickness can be measured. And it can measure easily even if the kind of steel plate changes and width, thickness, etc. change.

FIG. 7 is a conceptual diagram illustrating the operation of the detection apparatus 300 according to an embodiment of the present invention.
As shown in FIG. 7A, the measurement head 330 descends to measure the scale of the steel sheet. When the measurement is completed, the drive unit 320 raises the measurement head 330 as shown in FIG. 7B. Let me. However, in an emergency (for example, when the power is off) where the measurement head 330 cannot be raised because the drive unit 320 is in an abnormal state, the steel sheet A moves while the measurement head 330 remains in contact. Thus, there is a problem that defects occur on the surface of the steel plate.

  Accordingly, in the present invention, in an emergency in which the drive unit 320 does not operate, the emergency cylinder 311 provided in the body unit 310 is driven to raise the body unit 310 from the frame 200, whereby the measurement head 330 is raised from the steel plate A. Can be configured to.

  At this time, it is preferable that the distance that the body part 310 rises from the frame 200 is larger than the maximum distance that the measurement head 330 is lowered by the driving part 320. Accordingly, even when the measurement head 330 moves to the maximum lowering distance due to an abnormal operation of the drive unit 320, the measurement head 330 can be separated from the steel plate A by the rise of the body portion 310, so that the steel plate is defective. It can be prevented from occurring.

FIG. 8 is a block diagram of a scale thickness measuring apparatus according to an embodiment of the present invention.
The scale thickness measurement control system will be described with reference to FIG. 8. First, the control unit 400 receives information (length, width, steel type) of the steel plate from the system server (for example, the control unit or main server of the previous stage process). And the like, the output signal is applied to the body portion 310 of the detection device 300 so as to be separated according to the width of the steel plate.

  Next, when the transfer device 100 stops, an output signal is applied to the drive unit 320 and the measuring head 330 is lowered to measure the scale of the steel sheet. When the measurement is completed, the output signal is applied to the drive unit 320 again. The measuring head 330 is raised. At this time, if the driving unit 320 is determined to be in an abnormal state, an output signal can be applied to the body unit 310 so as to raise the body unit 310 from the frame 200. When the temperature measured by the temperature sensor 335 exceeds the critical value, the measurement can be stopped and the measuring head can be raised. In addition, when the control unit 400 determines that the steel plate is moved by the movement detection sensor, the control unit 400 can apply an output signal to the drive unit 320 so as to raise the measuring head even when the measurement is not completed. .

  Next, the control unit 400 collects the measurement data transmitted from the plurality of measurement sensors 332, calculates the average value, and calculates the scale thickness of the steel sheet. At this time, in order to reduce the measurement error, the average value can be calculated from the remaining data excluding the largest value and the smallest value among the transmitted data.

  At this time, the scale thickness value can be corrected according to the temperature information received from the temperature sensor. Specifically, the control unit 400 includes a memory unit 410 in which correlation data between a temperature and a measured value is stored, and can be used to correct the scale thickness value according to the received temperature. Further, it is possible to correct a measurement value by selecting a suitable calibration curve according to the received steel type information.

  The control unit 400 outputs the measured scale thickness to the display unit 500, and can store the scale thickness in the memory unit 410 if a difference from the value actually measured offline by the user occurs.

  The above description has been made with reference to the embodiment of the present invention. However, a person who has ordinary knowledge in the technical field does not depart from the spirit and scope of the present invention described in the following claims. It can be easily understood that the present invention can be modified and changed in various ways.

Claims (12)

A transfer device for moving a steel plate having a predetermined width;
A frame disposed above the transfer device;
A plurality of detection devices connected to the frame and measuring the scale thickness of the steel sheet descending at a time when the transfer device stops;
A control unit that calculates the scale thickness of the steel sheet according to a plurality of scale thickness measurement values received from the detection device;
Only including,
The detection device includes a body portion coupled to the frame, a measurement head that contacts the steel plate, and a drive unit that is fixed to the body portion and raises / lowers the measurement head,
The measurement head includes a movement detection sensor that detects the operation of the transfer device,
The scale thickness measuring apparatus according to claim 1, wherein the controller outputs a control signal to the driving unit to raise the measuring head when the movement detecting sensor detects the operation of the transfer device.   The scale thickness measurement apparatus according to claim 1, wherein the control unit receives information about the steel plate in advance and adjusts the separation distance between the plurality of detection devices according to the width of the steel plate. The scale thickness measuring apparatus according to claim 1 , wherein the measuring head is coupled to the driving unit so as to be able to rotate back and forth and right and left. The scale thickness measurement according to claim 1 , further comprising a damping structure coupled between the measurement head and the driving unit and maintaining a constant pressure applied to the steel plate by the measurement head. apparatus. The damping structure includes a guide portion and a slide portion that slides on the guide portion,
5. The scale thickness measuring apparatus according to claim 4 , wherein the slide part slides on the guide part by a descending distance of the drive part after the measurement head is lowered and contacts the steel plate. 6. . The scale thickness measuring apparatus according to claim 5 , wherein a maximum slide distance of the slide part is larger than a maximum descending distance of the measurement head. The measuring head includes a head housing, is inserted into the head housing, according to claim 1, terminal characterized in that it comprises a plurality of measurement sensors in contact with the steel plate is exposed to the outside of the head housing Scale thickness measuring device. Including a temperature sensor disposed inside the head housing;
The scale thickness measurement apparatus according to claim 7 , wherein the control unit corrects the scale thickness measurement value according to an internal temperature received from the temperature sensor. The control unit outputs a control signal to the drive unit to raise the measurement head when an internal temperature measured by the temperature sensor exceeds a preset critical value. Item 9. The scale thickness measuring device according to Item 8 . The scale thickness measuring apparatus according to claim 7 , wherein a channel is formed in an outer wall of the head housing, and a cooling gas circulates in the channel. Including an emergency cylinder disposed between the body portion and the frame;
The scale thickness measuring apparatus according to claim 1 , wherein the controller applies an output signal to the emergency cylinder so as to raise the body part in an emergency. The scale thickness measuring device according to claim 11 , wherein the height of the body portion raised by the emergency cylinder is higher than the maximum height of the measuring head lowered by the driving portion.

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