Roll surface condition determination assisting device, roll surface impurity removal device, and roll surface impurity removal method

Abstract

The present invention relates to a roller surface state determination assisting device, a roller surface impurity removal device, and a roller surface impurity removal method. The roller surface state determination assisting device comprises: a vibration detection unit for detecting vibration of a scraper unit having a plate abutting against the surface of a roller placed in a hot dip metal bath; and a vibration exciting unit for generating vibration detected by the vibration detection unit at a position away from the scraper unit, and determining the removal state of impurities present on the roller surface based on the generated vibration.

Description

Technical Field

[0001] The present invention relates to a state judgment assisting device for a surface of a roller disposed in a hot dip metal coating bath, an impurity removing device for the surface of the roller, and an impurity removing method for the surface of the roller. Background Art

[0002] In a continuous hot-dip plating line that continuously immerses a steel strip in a hot-dip metal plating bath to apply plating treatment to the surface of the steel strip, surface defects may occur due to impurities (including coarsened precipitates) attached to a roll placed in the bath (hereinafter appropriately referred to as a "bath roll"). In order to remove impurities attached to the surface of the bath roll, there is a technology that keeps the surface of the sinking roll clean by a wiping device, as described in Japanese Utility Model Application Laid-Open No. 61-164268. Summary of the invention

[0003] Problems to be solved by the invention

[0004] However, the wiping device described in Japanese Utility Model Application Laid-Open No. 61-164268 does not consider the state of removal of impurities on the surface of the roller in the bath. That is, even if the wiping device described in Japanese Utility Model Application Laid-Open No. 61-164268 is used for the operation of removing impurities on the surface of the roller in the bath, there is a problem that the state of impurity removal on the roller surface including the completion of removal cannot be determined.

[0005] Therefore, an object of the present invention is to provide a roll surface state determination assisting device, a roll surface impurity removing device, and a roll surface impurity removing method capable of grasping the impurity removal state of the surface of a roll placed in a hot dip metal coating bath.

[0006] Means for solving problems

[0007] The roller surface state judgment auxiliary device of the first scheme of the present invention comprises: a vibration detection unit, which detects the vibration of a scraper unit, the scraper unit having a plate that abuts against the surface of a roller arranged in a hot dip metal bath; and an excitation unit, which generates vibrations detected by the vibration detection unit at a position away from the scraper unit, and judges the removal state of impurities present on the roller surface based on the generated vibrations.

[0008] The roller surface state judgment auxiliary device of the second scheme of the present invention is that the roller surface state judgment auxiliary device of the first scheme also includes a conversion unit, and when the state of the vibration detected by the above-mentioned vibration detection unit is set to the first state, the conversion unit converts the above-mentioned first state into the second state generated by the above-mentioned excitation unit.

[0009] The impurity removal device for the roller surface of the third embodiment of the present invention comprises: a scraper section having a plate that contacts the surface of a roller placed in a hot dip metal bath to remove impurities on the roller surface; and a roller surface state judgment auxiliary device of the first embodiment or the second embodiment.

[0010] The impurity removal device for the roller surface of the fourth scheme of the present invention comprises: a scraper portion, having a plate that abuts against the surface of a roller set in a hot-dip metal bath to remove impurities on the roller surface; a vibration detection portion, detecting the vibration of the above-mentioned scraper portion; a driving portion, moving the above-mentioned scraper portion along the axial direction of the above-mentioned roller; and a movement control portion, controlling the above-mentioned driving portion based on the vibration detected by the above-mentioned vibration detection portion so as to move the above-mentioned scraper portion to a specified position in the axial direction of the above-mentioned roller to remove the above-mentioned impurities.

[0011] A fifth aspect of the present invention is the device for removing impurities from the surface of a roll according to any one of the first to fourth aspects, wherein the hot-dip metallization bath is a hot-dip galvanizing bath.

[0012] The method for removing impurities from the surface of a roller of the sixth embodiment of the present invention includes: a contact process, in which the plate of a scraper portion provided with a plate is brought into contact with the surface of a roller provided in a hot-dip metal bath; a vibration detection process, in which the vibration generated in the scraper portion is detected; a state determination process, in which the detected vibration of the scraper portion is generated at a position away from the scraper portion, and the removal state of impurities present on the surface of the roller is determined based on the generated vibration; and a removal process, in which the impurities are removed by the scraper portion based on the determined removal state of the impurities.

[0013] The method for removing impurities from the roller surface of the seventh embodiment of the present invention is a method for removing impurities from the roller surface of the sixth embodiment, which further includes a conversion process, and when the state of the above-mentioned vibration detected in the above-mentioned vibration detection process is set to the first state, the above-mentioned first state is converted into the second state reproduced in the above-mentioned state judgment process.

[0014] The method for removing impurities from the surface of a roller of the eighth embodiment of the present invention includes: a contact process, in which the plate of a scraper portion provided with a plate is brought into contact with the surface of a roller provided in a hot-dip metal bath; a vibration detection process, in which the vibration generated in the scraper portion is detected; a state determination process, in which, at a position away from the scraper portion, the removal state of impurities present on the surface of the roller is determined based on the vibration detected in the vibration detection process; a position change process, in which the position of the scraper portion in the axial direction of the roller is controlled based on the detected vibration; and a removal process, in which impurities are removed by the scraper portion based on the determined removal state of the impurities.

[0015] A ninth aspect of the present invention is the method for removing impurities from the surface of a roll according to any one of the sixth to eighth aspects, wherein the hot-dip metallization bath is a hot-dip galvanizing bath.

[0016] Effects of the Invention

[0017] As described above, the present invention can provide a roll surface state determination assisting device, a roll surface impurity removing device, and a roll surface impurity removing method that can grasp the impurity removal state of the roll surface of a roll placed in a hot dip metal coating bath. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a layout diagram showing an example of the schematic configuration of a hot-dip metal-coated steel strip manufacturing apparatus according to the first embodiment of the present invention.

[0019] Figure 2 It is an explanatory diagram showing a schematic configuration of the device for removing impurities from the surface of a roller according to the first embodiment.

[0020] Figure 3 It is an explanatory diagram showing a schematic configuration of the device for removing impurities from the surface of a roller according to the first embodiment.

[0021] Figure 4 This is a diagram schematically showing the results of spectrum analysis of vibration directly detected in the scraper portion before foreign matter on the roller surface is removed in the first embodiment.

[0022] Figure 5 This is a diagram schematically showing the results of spectrum analysis of vibrations directly detected in the scraper portion after foreign matter on the roller surface in the first embodiment has been removed.

[0023] Figure 6 This is a diagram schematically showing the results of spectrum analysis of vibrations obtained by reproducing the vibrations detected in the scraper section before the foreign matter on the roller surface in the first embodiment is removed.

[0024] Figure 7 This is a diagram schematically showing the results of spectrum analysis of vibrations reproduced from the vibrations detected in the scraper portion after the impurities on the roller surface in the first embodiment have been removed.

[0025] Figure 8 This is a flowchart of the method for removing impurities from the roller surface according to the first embodiment.

[0026] Fig. 9 It is an explanatory diagram showing a schematic configuration of a modified example of the device for removing impurities from the roller surface according to the first embodiment.

[0027] Fig.10This is a flowchart for explaining a modified example of the method for removing impurities from the roller surface according to the first embodiment.

[0028] Fig.11 It is an explanatory diagram showing a schematic configuration of a device for removing impurities from a roller surface according to a second embodiment.

[0029] Fig.12 This is a flowchart of the method for removing impurities on the roller surface according to the second embodiment. DETAILED DESCRIPTION

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in this specification and the accompanying drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and repeated descriptions are omitted.

[0031] [First embodiment]

[0032] Next, a roll surface state determination assisting device, a roll surface impurity removing device, and a roll surface impurity removing method according to a first embodiment of the present invention will be described.

[0033] <General Configuration of a Hot-Dip Metallized Steel Strip Manufacturing Apparatus>

[0034] First, refer to Figure 1 A schematic configuration of a hot-dip metal-coated steel strip manufacturing apparatus 10 according to a first embodiment of the present invention will be described. Figure 1 This is a layout diagram showing an example of the schematic configuration of a hot-dip metal-coated steel strip manufacturing apparatus 10 according to the present embodiment.

[0035] like Figure 1 As shown, a hot-dip metallized steel strip manufacturing apparatus 10 is an apparatus for manufacturing a hot-dip metallized steel strip 1A by continuously dipping a steel strip 1 into a coating bath 11 to perform hot-dip metallization treatment, thereby forming a coating film on the surface of the steel strip 1 .

[0036] The steel strip 1 is an example of a metal strip to be subjected to a plating treatment using the molten metal M. The type of the steel strip 1 is not particularly limited, and for example, mild steel or high-strength steel may be used.

[0037] The plating tank 12 stores a plating bath 11 formed of a molten metal M. Examples of the molten metal M constituting the plating bath 11 include simple substances of Zn, Al, Sn, and Pb, or alloys thereof. Alternatively, the molten metal M also includes metals or alloys containing non-metallic elements such as Si and P, typical metal elements such as Ca, Mg, and Sr, and transition metal elements such as Ti, V, Cr, Mn, Fe, Co, Ni, and Cu in these metals or alloys. In the following description, an example is described in which molten zinc is used as the molten metal M forming the plating bath 11, and the molten zinc is attached to the surface of the steel strip 1 to produce a hot-dip metal-plated steel strip 1A.

[0038] In addition, if Figure 1 As shown, the hot-dip metal-coated steel strip manufacturing apparatus 10 of the present embodiment includes a snout 13, a sink roll 14, support rolls 15A and 15B, a gas wiping nozzle 16, an induction heating device 17, and a roll surface impurity removal device 100.

[0039] The inlet 13 is a tubular member whose upper end is connected to the outlet side of the annealing furnace (not shown) and whose lower end is immersed in the coating bath 11 and is inclined. The inlet 13 covers the steel strip 1 from the outside, and the inside of the inlet 13 becomes a non-oxidizing atmosphere. Thus, the surface of the steel strip 1 after annealing can be prevented from contacting with the atmosphere and oxidation can be suppressed.

[0040] The sinking roller 14 is arranged at the lower part of the coating bath 11. The sinking roller 14 has a larger diameter than the support rollers 15A and 15B. The sinking roller 14 rotates in the clockwise direction as the steel strip 1 is conveyed, and changes the conveying direction of the steel strip 1 introduced into the coating bath 11 through the inlet 13 toward the oblique downward direction to the vertical direction upward.

[0041] The support rollers 15A and 15B are disposed above the sinking roller 14 in the coating bath 11, and sandwich the steel strip 1 pulled up in the vertical direction by the sinking roller 14 from both sides. The support rollers 15A and 15B suppress the vibration of the pulled steel strip 1. The support rollers 15A and 15B may be provided in pairs but only one, or three or more. Alternatively, the support rollers 15A and 15B may be omitted.

[0042] The gas wiping nozzle 16 sprays gas such as air onto the surface of the steel strip 1 in order to adjust the unit area weight of the molten metal M relative to the steel strip 1. The gas compressed by a compressor (not shown) or the like is introduced into the gas wiping nozzle 16. The gas wiping nozzle 16 is arranged on both sides of the thickness direction of the steel strip 1, and is set at a position that is downstream of the support rolls 15A and 15B in the conveying direction of the steel strip 1 and at a predetermined height from the bath surface of the coating bath 11. The gas sprayed from the gas wiping nozzle 16 is sprayed onto both sides of the steel strip 1 pulled up from the coating bath 11 in the vertical direction, and the excess molten metal M is removed. As a result, the unit area weight of the molten metal M relative to the surface of the steel strip 1 is adjusted to an appropriate amount, and the film thickness of the molten metal M attached to the surface of the steel strip 1 is adjusted.

[0043] The induction heating device 17 is disposed at a position downstream of the gas wiping nozzle 16 in the conveying direction of the steel strip 1, and performs heat treatment on the steel strip 1. Specifically, induction heating coils connected to a high-frequency power source (not shown) are disposed on both sides of the thickness direction of the steel strip 1. The temperature near the surface of the steel strip 1 is raised to about 500 degrees by heating by the induction heating device 17, so that alloying occurs between the molten metal M attached to the surface of the steel strip 1 and the steel strip 1. As a result, an alloyed zinc plating film is formed on the surface of the steel strip 1.

[0044] The operation of the manufacturing device 10 for hot-dip metal-plated steel strip of the above-mentioned structure is described. The manufacturing device 10 for hot-dip metal-plated steel strip moves the steel strip 1 by a driving source not shown in the figure, and passes the steel strip 1 through each part in the device. The steel strip 1 is introduced into the plating bath 11 obliquely downward through the inlet 13, and the conveying direction is changed to the vertical direction upward around the sinking roller 14. Then, the steel strip 1 passes between the support rollers 15A and 15B to rise, and is pulled out of the plating bath 11. Thereafter, the excess molten metal M attached to the steel strip 1 is removed by the pressure of the gas blown from the gas wiping nozzle 16, and the amount of molten metal M attached to the surface of the steel strip 1 is adjusted to a specified unit area weight. Then, the alloying between the molten metal M and the steel strip 1 is promoted by the induction heating device 17, and an alloyed plating film is formed on the surface of the steel strip 1. As described above, the hot-dip metal-plated steel strip manufacturing apparatus 10 continuously immerses the steel strip 1 in the coating bath 11 to coat the molten metal M, thereby manufacturing the hot-dip metal-plated steel strip 1A having a predetermined weight per unit area.

[0045] Here, various impurities may exist on the surface of the roller (hereinafter, in this specification, the support rollers 15A, 15B and the sinking roller 14 may be simply referred to as the roller) in the coating bath 11. For example, the impurities on the roller surface include top dross (Fe 2 Al 5 Znx), low slag (FeZn 3 、FeZn7 , Fe 5 Zn 21 or Fe 3 Zn 10 ), slag (Zn or Al oxides), or substances to which inclusions in the bath are attached. In addition, as other examples of impurities on the roll surface, there can be cited substances after the alloy components in the plating bath 11 are precipitated and coarsened on the roll surface. When such impurities on the roll surface come into contact with the steel strip surface, surface defects such as flaws on the steel strip surface may occur.

[0046] Therefore, if Figure 1 As shown, the manufacturing device 10 of the hot-dip metal-coated steel strip includes a roller surface impurity removal device 100. The roller surface impurity removal device 100 removes impurities present on the roller surface. Specifically, the roller surface impurity removal device 100 presses a scraper portion 110 as a scraper-like member toward the roller surface to remove impurities on the roller surface. The details of the roller surface impurity removal device 100 will be described later.

[0047] In addition, Figure 1 In the example, the impurity removing device 100 on the roll surface is provided for the backup roll 15B, but it may be provided for the sinking roll 14 or the backup roll 15A. The above is a description of the schematic configuration of the hot dip metallized steel strip manufacturing device 10 of the present embodiment.

[0048] <Roller Surface Impurity Removal Device>

[0049] Next, refer to Figure 2 as well as Figure 3 The device 100 for removing impurities from the surface of a roll according to the present embodiment will be described. Figure 2 1 is a diagram showing a schematic configuration of a device 100 for removing impurities from a roller surface according to the present embodiment. Figure 3 The figure shows the schematic structure of the impurity removal device 100 of the roller surface according to the present embodiment, and is Figure 2 A-A' line cross-section diagram. Figure 2 As shown, the impurity removal device 100 of the roller surface of this embodiment includes a scraper section 110, a vibration detection section 120, and an excitation section 160. In addition, the vibration detection section 120 and the excitation section 160 constitute a state determination auxiliary device 118 of this embodiment. The state determination auxiliary device 118 is a device that assists in determining the state of impurity removal on the roller surface.

[0050] (Scraper part)

[0051] The scraper portion 110 is a scraper-shaped member that is pressed against the surface of the roller disposed in the plating bath 11. Specifically, the scraper portion 110 includes a plate 111 and a rod 113. The plate 111 is a metal flat plate-shaped member that abuts against the surface of the roller. Specifically, the front end portion 111A of the flat plate-shaped portion of the plate 111 abuts against the surface of the roller. The width of the plate 111 in the roller axis direction is shorter than the axial length of the roller. The position where the plate 111 abuts is not particularly limited as long as it does not hinder the conveyance of the steel strip 1. For example, the plate 111 is configured to abut against the upper surface or side surface of the roller. The plate 111 is formed, for example, of tool steel such as SKD11 or SKH51, stainless steel such as SUS304L or SUS316L, or Co-based alloys such as Stellite #6 or Stellite #21 (in addition, "Stellite" is a registered trademark).

[0052] The rod 113 is a rod-shaped member extending from the main body 130 toward the roller. One end 113A of the rod 113 is supported by the main body 130, and the plate 111 is supported at the other end 113B of the rod 113. The shape or material of the rod 113 is not particularly limited as long as it can support the plate 111 in the plating bath 11.

[0053] The scraper 110 can be moved toward the roller surface by the cylinder 115. Specifically, the cylinder 115 is connected to the rod 113, and the cylinder 115 displaces the rod 113, so that the front end 111A of the blade comes into contact with or moves away from the roller surface.

[0054] (Vibration detection unit)

[0055] like Figure 2 as well as Fig. 9 As shown, the vibration detection unit 120 detects the vibration generated in the scraper unit 110. The vibration corresponds to the removal state of impurities existing on the roller surface, so the vibration detection unit 120 detects the vibration, thereby making it possible to grasp the impurity removal state of the roller surface. Specifically, when the scraper unit 110 is brought into contact with the roller surface, friction is generated between the scraper unit 110 and the roller, and the rod 113 vibrates due to the friction. In addition, the rod 113 also vibrates by crossing the step difference caused by relatively large impurities. The vibration changes according to the removal state of impurities existing on the roller surface. That is, when impurities remain on the roller surface, the friction force generated between the scraper unit 110 and the roller and the height difference of the surface shape are large, so the vibration generated in the scraper unit 110 is large. On the other hand, when impurities are removed from the roller surface, the friction force and the height difference between the scraper unit 110 and the roller are reduced, thereby reducing the vibration generated in the scraper unit 110. In this way, by detecting the change in the strength (amplitude or vibration energy) of the vibration of the rod 113 of the scraper unit 110, the removal state of foreign matter on the roller surface can be grasped.

[0056] Specifically, if Fig. 9 As shown, the vibration detection unit 120 is provided at the middle portion 113C of the rod 113. The vibration generated in the scraper portion 110 is transmitted from the other end 113B to the one end 113A of the rod 113. In addition, although an example in which the vibration detection unit 120 is provided at the rod 113 is shown, it is not limited to this. For example, the vibration detection unit 120 may also be provided at the connection portion between the rod 113 and the cylinder 115.

[0057] The vibration detector 120 is a uniaxial acceleration sensor, and detects vibration generated in the blade 110 by detecting acceleration generated in the rod 113 in a direction perpendicular to or parallel to the longitudinal direction of the rod 113. As an example, the vibration detector 120 is a piezoelectric acceleration sensor.

[0058] (Main body)

[0059] like Figure 2 As shown, the main body 130 is a frame portion provided outside the plating bath 11 and supporting the scraper 110 and the like at a predetermined position. Specifically, the main body 130 supports one end 113A of the rod 113 of the scraper 110. In addition, the main body 130 is provided with a cylinder 115 and a drive unit 140 described later.

[0060] (Driver)

[0061] The impurity removal device 100 of the roller surface of the present embodiment further includes a driving unit 140. The driving unit 140 moves the scraper unit 110 along the axial direction of the roller. By moving the scraper unit 110 along the axial direction of the roller, impurities on the roller surface can be removed at any position in the axial direction of the roller. Specifically, the driving unit 140 includes a screw feeding mechanism 141, a driving source 143, and a guide shaft 145.

[0062] The screw feed mechanism 141 includes a screw shaft 141A whose axial direction is arranged along the axial direction of the roller, and a support portion 141B that rotatably supports both ends of the screw shaft 141A. The screw shaft 141A is a rod-shaped member having threads arranged at a predetermined pitch on the outer circumference. Figure 3 As shown in FIG. 1 , the screw shaft 141A is screwed with and inserted through a bracket 141C of the cylinder 115 to which the scraper section 110 is mounted. In addition, a drive source 143 is connected to the end of the screw shaft 141A, and the screw shaft 141A is rotated by the drive source 143. Thus, the scraper section 110 is screw-fed and moved along the axial direction of the roller by the rotation of the screw shaft 141A.

[0063] The guide shaft 145 is a rod-shaped member provided in parallel with the screw shaft 141A along the axial direction of the roller. Both ends of the guide shaft 145 are supported by the support portion 141B of the screw shaft 141A. Figure 3As shown, the guide shaft 145 supports a bracket 145A to which one end 113A of the rod 113 of the scraper unit 110 is mounted. The guide shaft 145 stabilizes the movement of the scraper unit 110 in the roller axis direction so that the cylinder 115 can perform a pressing action to press the scraper unit 110 against the roller (see Figure 3 (with double-headed arrow in the middle).

[0064] (Control Department)

[0065] Furthermore, the roller surface impurity removal device 100 of the present embodiment includes a control unit 150. The control unit 150 controls the operation of the roller surface impurity removal device. Specifically, Figure 2 As shown, the control unit 150 obtains the detection result from the vibration detection unit 120 and controls the drive unit 140 and the cylinder 115. For example, the control unit 150 is connected to the operation unit 180, and the drive unit 140 and the cylinder 115 are controlled based on the input from the operation unit 180 operated by the operator.

[0066] The control unit 150 outputs the detection result from the vibration detection unit 120 to the vibration excitation unit 160 described later. The detection result from the vibration detection unit 120 is not limited in form, and may be, for example, a change in vibration intensity with respect to time.

[0067] (Excitation part)

[0068] The excitation unit 160 generates the vibration detected by the vibration detection unit 120 at a position away from the scraper unit 110 based on the detection result from the vibration detection unit 120. In other words, the excitation unit 160 generates the vibration that reproduces the vibration detected by the vibration detection unit 120 at a position away from the scraper unit 110. Specifically, Fig. 9 As shown, the excitation unit 160 includes an amplifier 161 and a vibration generating unit 163. The detection result of the vibration detection unit 120 is input to the excitation unit 160 located away from the scraper unit 110 through a wired connection such as a cable. The detection result of the vibration detection unit 120 is amplified in the amplifier 161 of the excitation unit 160, and then input to the vibration generating unit 163. The vibration generating unit 163 generates physical vibration based on the input signal. The excitation unit 160 specifically generates vibration that reproduces the change in strength (change in amplitude) of the vibration detected in the vibration detection unit 120.

[0069] Below, refer to Figures 4 to 7 The following describes the change in vibration detected by the vibration detector 120 before and after the removal of foreign matter from the roller surface. Figure 41 is a diagram schematically showing the results of spectrum analysis of vibrations directly detected in the rod 113 of the scraper section 110 before impurities on the roller surface are removed. Figure 5 : is a diagram schematically showing the results of spectrum analysis of vibrations directly detected in the rod 113 of the scraper section 110 after impurities on the roller surface are removed. Figure 4 As shown in FIG. 1 , before the impurities on the roller surface are removed, a peak with a larger intensity is detected in a wider range of frequencies, resulting in a larger vibration. Figure 5 As shown, after the impurities on the roller surface are removed, the peak intensity decreases. In particular, in the low frequency region below 1000 Hz, the peak intensity decreases significantly. In this way, when the impurities on the roller surface are removed, the magnitude (amplitude) of the vibration of the scraper portion 110 decreases.

[0070] Figure 6 The diagram schematically shows the result of spectrum analysis of vibrations obtained by reproducing the vibrations detected in the rod 113 of the scraper 110 before the foreign matter on the roller surface is removed by the vibration excitation unit 160 . Figure 7 1 is a diagram schematically showing the result of spectrum analysis of vibrations detected in the rod 113 of the scraper 110 after the impurities on the roller surface are removed by the excitation unit 160. Figure 6 As shown in FIG. 1 , in the spectrum analysis results of the vibration reproduced by the excitation unit 160, before the impurities on the roller surface are removed, a peak with a large intensity is detected in a wide range of frequencies, and a large vibration is generated. Figure 7 As shown, after the impurities on the roller surface are removed, the intensity of the peak decreases, especially the intensity of the peak in the low frequency region decreases significantly.

[0071] As described above, the vibration detected by the vibration detection unit 120 is reproduced by the excitation unit 160, and the same tendency as the vibration generated in the rod 113 of the scraper unit 110 is observed. In other words, the vibration reproduced by the excitation unit 160 also has a tendency that the magnitude of the vibration decreases as the impurities on the roller surface are removed. In this way, the excitation unit 160 can realize the state of impurity removal on the roller surface at a position away from the scraper unit 110.

[0072] As an example of the excitation unit 160, an electric exciter can be cited. In particular, as the excitation unit 160, an excitation table having a vibration surface that can be touched by an operator or the like can be cited. In addition, the excitation unit 160 is provided at a position away from the scraper unit 110. For example, the excitation unit 160 is provided around the plating tank 12 or in an operation room of an operation production line.

[0073] The vibration generated in the scraper 110 is reproduced by the vibration unit 160, thereby the removal state of impurities on the roller surface can be understood. That is, the intensity change of the vibration is reproduced by the vibration unit 160, thereby when the vibration of the vibration unit 160 is large, it can be understood that impurities remain on the roller surface. On the other hand, when the vibration of the vibration unit 160 is small, it can be understood that the impurities on the roller surface are removed.

[0074] Furthermore, by reproducing the vibration by the excitation unit 160, the removal state can be grasped in the device 100 for removing impurities on the roller surface based on the same basis as the impurity removal based on manual operation. That is, when the operator uses a tool such as a scraper to remove impurities on the roller surface, the removal state of impurities on the roller surface can be grasped by sensing the vibration of the scraper. By reproducing the vibration by the excitation unit 160, the operator can also sense and grasp the removal state of impurities through the vibration in the device 100 for removing impurities on the roller surface. The above is a description of the general structure of the device 100 for removing impurities on the roller surface of this embodiment.

[0075] <Method for Removing Impurities from Roller Surface>

[0076] Next, refer to Figure 8 The method for removing impurities from the roller surface according to the present embodiment will be described. Figure 8 Flow chart of the method for removing impurities from the roller surface according to the present embodiment. Figure 8 As shown, first, the scraper unit 110 is brought into contact with the roller surface (S101). Specifically, the plate piece 111 provided at the other end 113B of the rod 113 of the scraper unit 110 is brought into contact with the roller surface. Thus, the scraper unit 110 starts to remove impurities on the roller surface. In addition, in this embodiment, the operator moves the scraper unit 110 by operating the operating unit 180.

[0077] During the removal of foreign matter from the roller surface, vibration occurs in the rod 113 of the scraper unit 110. The vibration of the scraper unit 110 is detected by the vibration detector 120 (S103).

[0078] The vibration of the rod 113 detected in step S103 is reproduced as vibration at a position away from the blade portion 110 by the vibration excitation unit 160 ( S105 ).

[0079] Based on the vibration reproduced by the excitation unit 160 in step S105, the removal state of impurities existing on the surface of the roller can be grasped (S107). That is, the operator who touches the excitation unit 160 can grasp the removal state of impurities on the surface of the roller. Here, when the operator senses the vibration of the excitation unit 160 and determines that the removal of impurities on the surface of the roller is insufficient, the operator does not move the position of the scraper unit 110 along the roller axis direction (that is, does not perform an operation to move it), and continues to remove impurities by the scraper unit 110 at this position. In other words, at the portion of the roller surface where the scraper unit 110 is removing impurities, the scraper unit 110 continues to remove impurities at the same position until the operator determines that the impurity removal is completed based on the vibration of the excitation unit 160. On the other hand, when the operator determines that the removal of impurities on the surface of the roller is completed, the operator operates the operation unit 180 to change the position of the scraper unit 110 in the roller axis direction, and removes impurities existing on the roller surface at another position in the roller axis direction (S109).

[0080] Specifically, when the vibration detected in step S103 is large, since impurities remain on the roller surface, the vibration reproduced by the excitation unit 160 also becomes large, so the operator continues to remove impurities at the position in the roller axis direction using the scraper unit 110. On the other hand, when the vibration detected in step S103 is small, since impurities on the roller surface are removed, the vibration reproduced by the excitation unit 160 also becomes small, so the operator changes the position of the scraper unit 110 in the roller axis direction. The above is a description of the method for removing impurities on the roller surface according to the present embodiment.

[0081] According to this embodiment, the operator can grasp the impurity removal state of the surface of the roller placed in the hot-dip galvanizing bath 11 based on the vibration of the excitation unit 160, so that the removal state including the completion of impurity removal can be determined for the impurity removal operation on the roller surface.

[0082] In the impurity removing device 100 of the first embodiment, the vibration detected by the vibration detecting unit 120 is transmitted to the excitation unit 160 via the control unit 150 to reproduce the vibration, but the present invention is not limited to this configuration. Fig. 9 As shown in the impurity removing device 101 of the modified example, the vibration detected by the vibration detecting unit 120 is transmitted to the excitation unit 160 via the conversion unit 170 to reproduce the vibration. Specifically, the impurity removing device 101 includes the conversion unit 170, and when the state of the vibration detected by the vibration detecting unit 120 is set to the first state, the conversion unit 170 converts the first state into a second state reproduced by the excitation unit 160. Fig. 9As shown, the conversion unit 170 is provided between the vibration detection unit 120 and the excitation unit 160 in the circuit. The conversion unit 170 electrically converts the detection result from the vibration detection unit 120 and outputs it to the excitation unit 160. Specifically, the conversion unit 170 converts the frequency detected as the first state in the vibration detection unit 120 into a frequency as the second state that can be reproduced by the excitation unit 160. Specifically, the conversion unit 170 converts the signal related to the frequency in the detection result from the vibration detection unit 120 into a signal related to the frequency that can be reproduced by the excitation unit 160, and outputs it to the excitation unit 160. By converting the state of vibration in the scraper unit 110 into the state of vibration that can be reproduced by the excitation unit 160 by the conversion unit 170, it becomes the state of vibration that is most suitable for reproduction by the excitation unit 160, and it is easy to grasp the impurity removal state of the roller surface. The frequency as the second state that can be reproduced by the excitation unit 160 can be, for example, a frequency in the range that can be perceived by humans. Thus, when the excitation unit 160 is set as an exciter, a person can understand the removal state of impurities on the roller surface based on the vibration reproduced by the excitation unit 160. In addition, the conversion unit 170 may also have a function as a filter for removing noise from the detection result from the vibration detection unit 120. In addition, as Fig.10 As shown, in the impurity removal method when the impurity removal device 101 is used, when the state of vibration detected in step S103 is set to the first state, the first state is converted into the second state (S113) reproduced in step S107. In addition, in the impurity removal device 101, the vibration detection unit 120, the excitation unit 160 and the conversion unit 170 constitute a state determination assisting device 119 that assists in determining the impurity removal state of the roller surface.

[0083] [Second embodiment]

[0084] Next, a device for removing impurities from a roller surface according to a second embodiment of the present invention will be described.

[0085] As described above, in the second embodiment, components having substantially the same functional configuration as those in the first embodiment are denoted by the same reference numerals, and duplicate descriptions thereof are omitted.

[0086] <Roller Surface Impurity Removal Device>

[0087] The impurity removing device 102 of this embodiment is similar to the impurity removing device 100 of the first embodiment, and is used in the manufacturing device 10 for hot-dip metal-plated steel strip.

[0088] like Fig.11As shown in FIG. 1 , the impurity removal device 102 is configured such that the control unit 151 determines the state of the roller surface based on the detection result of the vibration detection unit 120, and moves the scraper unit 110 along the roller axis direction according to the determination result. In this way, in the impurity removal device 102, the control unit 151 determines the impurity removal state of the roller surface, and therefore does not include the excitation unit 160 of the impurity removal device 100 of the first embodiment. Fig.11 As shown, the impurity removing device 102 of the present embodiment includes an operation unit 180 for manually operating the scraper unit 110 .

[0089] The control unit 151 of this embodiment obtains the detection result from the vibration detection unit 120 and controls the drive unit 140 and the cylinder 115. In particular, the control unit 151 controls the drive unit 140 based on the vibration detected by the vibration detection unit 120, thereby functioning as a movement control unit that moves the scraper unit 110 to a predetermined position in the roller axis direction.

[0090] By grasping the removal state based on the vibration detected in the vibration detection unit 120, it is possible to remove impurities at a predetermined position in the roller axis direction. That is, impurities remain on the roller surface at a position where the vibration is relatively large in the roller axis direction. By moving the scraper unit 110 to the predetermined position along the roller axis direction and removing impurities on the roller surface, it is possible to effectively remove impurities on the roller surface. Specifically, the control unit 151 obtains the detection result from the vibration detection unit 120, and when the detection result exceeds a preset threshold, it is determined that the removal of impurities on the roller surface is not completed, and the scraper unit 110 is not moved along the roller axis direction, and the impurities on the roller surface are continuously removed at the same position in the roller axis direction. On the other hand, when the detection result from the vibration detection unit 120 is less than a preset threshold, the control unit 151 determines that the removal of impurities on the roller surface is completed, and moves the scraper unit 110 to another position in the roller axis direction. In addition, the above threshold is a value when it is determined that impurities are attached in the impurity removal based on manual operation. In addition, in this embodiment, an acceleration sensor is used as the vibration detection unit 120. Therefore, when the actual value of the acceleration detected by the acceleration sensor exceeds a preset threshold, the control unit 151 determines that impurities are attached to the roller surface. In addition, the control unit 151 may determine the impurity removal state of the roller surface by determining that impurities are attached when the detection result from the vibration detection unit 120 exceeds a threshold a predetermined number of times within a predetermined time.

[0091] In addition, the control unit 151 drives the driving source 143 to move the scraper unit 110 to a predetermined position in the axial direction of the roller via the screw feed mechanism 141. Then, the control unit 151 operates the cylinder 115 to press the scraper unit 110 toward the surface of the roller. Thus, the scraper unit 110 removes impurities at a predetermined position in the axial direction of the roller.

[0092] <Method for Removing Impurities from Roller Surface>

[0093] Next, refer to Fig.12 The method for removing impurities from the roller surface according to the present embodiment will be described. Fig.12 Flow chart of the method for removing impurities from the roller surface according to the present embodiment. Fig.12 As shown, first, the scraper 110 is brought into contact with the roller surface (S121). During the removal of impurities from the roller surface, the rod 113 of the scraper 110 vibrates, and the vibration detector 120 detects the vibration (S123).

[0094] In step S125, the control unit 151 compares the detection result detected in step S123 with the threshold value. Thus, the control unit 151 can grasp the removal state of impurities existing on the roller surface, and then determine whether the removal of impurities on the roller surface is completed (S127). If it is not determined that the removal of impurities is completed, the process returns to step S125 to grasp the removal state of impurities. On the other hand, in step S127, if it is determined that the removal of impurities on the roller surface is completed, the position of the scraper unit 110 in the axial direction of the roller is changed based on the vibration detected in step S123, and the impurities existing on the roller surface are removed at other positions in the roller axial direction (S129).

[0095] Specifically, when the vibration detected in step S123 is large, the control unit 151 determines that impurities remain on the roller surface, and continues to remove the impurities through the scraper unit 110 at a position in the roller axis direction. On the other hand, when the vibration detected in step S103 is small, the control unit 151 determines that the impurities on the roller surface are removed, and changes the position of the scraper unit 110 in the roller axis direction. At this time, the position change in the roller axis direction may also move the scraper unit 110 at a predetermined interval. In addition, based on the vibration state detected by the vibration detection unit 120, the scraper unit 110 may be moved to a position in the roller axis direction where the vibration is relatively large. The above is a description of the method for removing impurities on the roller surface of this embodiment.

[0096] According to the present embodiment, the control unit 151 can grasp the impurity removal state of the surface of the roller placed in the hot dip galvanizing bath 11 based on the detection result from the vibration detection unit 120. Thus, for the impurity removal operation on the roller surface, the removal state including the completion of impurity removal can be determined.

[0097] The preferred embodiments of the present invention are described in detail with reference to the accompanying drawings, but the present invention is not limited to the examples described. Anyone with common knowledge in the technical field to which the present invention belongs can obviously think of various modifications or application examples within the scope of the technical ideas recorded in the scope of the patent claims, and it should be understood that these also belong to the technical scope of the present invention.

[0098] For example, in the first embodiment described above, an example of an excitation table having a vibration surface that a person can touch is illustrated as the excitation unit 160, but the present invention is not limited to this example. For example, it may be a vibrator that a person can hold. In particular, as the excitation unit 160, it may also be configured by providing a controller that is the operation unit 180 used when moving the scraper unit 110 with a vibration function.

[0099] In addition, in the first embodiment and the second embodiment, a piezoelectric acceleration sensor is described as an example of the vibration detection unit 120, but the vibration detection unit 120 is not particularly limited as long as it can detect the vibration generated in the rod 113. For example, the vibration detection unit 120 of a non-contact type such as a microphone or a laser displacement meter may be configured to detect an acoustic signal or displacement associated with the vibration of the rod 113.

[0100] In addition, the vibration detection unit 120 may also be a sensor installed on a robot arm that can contact the scraper unit 110 and detects displacement associated with vibration. Furthermore, the robot arm may also be a slave arm in a master-slave robot. In this case, the master arm in the master-slave robot to which the displacement of the slave arm is transmitted may also function as the excitation unit 160.

[0101] In addition, in the impurity removal device 100 of the first embodiment, the operator determines the impurity removal state of the roller surface based on the vibration of the excitation unit 160, and in the impurity removal device 101 of the second embodiment, the control unit 151 determines the impurity removal state of the roller surface based on the detection result from the vibration detection unit 120, but the present invention is not limited to this configuration. For example, in the impurity removal device of other embodiments of the present invention, it can also be configured so that the case where the control unit determines the impurity removal state of the roller surface is set to the automatic operation mode, and the case where the operator determines the impurity removal state of the roller surface based on the vibration of the excitation unit 160 is set to the manual operation mode, and these modes can be switched.

[0102] In addition, in the above-mentioned embodiment, the excitation unit is made to generate (in other words, reproduce) the vibration detected by the vibration detection unit, but the present invention is not limited to this configuration. As long as the operator can perceive the change in vibration, the excitation unit may be replaced by a vibration reproduction unit such as a speaker that reproduces the vibration detected by the vibration detection unit as sound and auditorily displays it, or a display that visually displays a signal related to the change in vibration detected by the vibration detection unit.

[0103] In addition, the following supplementary notes are further disclosed with respect to the above embodiment.

[0104] (Note 1)

[0105] A device for removing impurities from the surface of a roll in a hot-dip galvanizing bath, comprising:

[0106] a scraper portion having a plate that abuts against a surface of a roller disposed in a hot dip galvanizing bath; and

[0107] The vibration detection unit detects the vibration of the scraper unit.

[0108] (Note 2)

[0109] In the device for removing impurities from the surface of a roll in a hot-dip galvanizing bath as described in Supplementary Note 1,

[0110] The device further includes a vibration reproducing unit that is provided at a position away from the scraper unit and reproduces the vibration detected by the vibration detecting unit.

[0111] (Note 3)

[0112] In the device for removing impurities from the surface of a roll in a hot-dip galvanizing bath as described in Supplementary Note 2,

[0113] A conversion unit is further provided for converting the first state into a second state reproduced by the vibration reproduction unit when the state of the vibration detected by the vibration detection unit is set to a first state.

[0114] (Note 4)

[0115] The device for removing impurities from the surface of a roll in a hot dip galvanizing bath according to any one of Supplementary Notes 1 to 3, further comprising:

[0116] a driving unit that moves the scraper unit along the axial direction of the roller; and

[0117] The movement control unit controls the driving unit based on the vibration detected by the vibration detection unit so that the scraper unit moves to a predetermined position in the axial direction of the roller.

[0118] (Note 5)

[0119] A method for removing impurities from the surface of a roller in a hot-dip galvanizing bath, comprising:

[0120] a contacting step of causing the sheet provided with the scraper portion of the sheet to contact the surface of a roller provided in a hot dip galvanizing bath;

[0121] a vibration detection step of detecting vibration generated in the scraper portion; and

[0122] The state grasping step grasps the removal state of foreign matter present on the surface of the roller based on the vibration detected in the vibration detecting step at a position away from the scraper portion.

[0123] (Note 6)

[0124] In the method for removing impurities on the surface of a roll in a hot-dip galvanizing bath as described in Supplementary Note 5,

[0125] The method further comprises: a vibration reproducing step of reproducing the detected vibration of the scraper portion;

[0126] In the state grasping step, the removal state is grasped based on the vibration reproduced in the vibration reproducing step.

[0127] (Note 7)

[0128] In the method for removing impurities on the surface of a roll in a hot-dip galvanizing bath as described in Supplementary Note 6,

[0129] It also includes: a conversion step, when the state of the vibration detected in the vibration detection step is set to a first state, converting the first state into a second state reproduced in the vibration reproduction step.

[0130] (Note 8)

[0131] The method for removing impurities on the surface of a roll in a hot dip galvanizing bath according to any one of Supplementary Notes 5 to 7, further comprising:

[0132] The scraper position changing step controls the position of the scraper portion in the axial direction of the roller based on the detected vibration.

[0133] All documents, patent applications, and technical standards described in this specification are incorporated herein by reference to the same extent as if each document, patent application, and technical standard were specifically and individually described, and are incorporated herein by reference.

[0134] Explanation of symbols

[0135] 10: Manufacturing device for hot-dip coated metal steel strip; 100: Impurity removal device for roller surface; 101: Impurity removal device for roller surface; 102: Impurity removal device for roller surface; 110: Scraper portion; 111: Plate; 113: Rod; 113A: One end; 113B: The other end; 118: Auxiliary device for determining the state of roller surface; 119: Auxiliary device for determining the state of roller surface; 120: Vibration detection portion; 130: Main body; 140: Drive portion; 150: Control portion; 160: Excitation portion; 170: Conversion portion.

Claims

1. A roller surface state determination auxiliary device, comprising: a vibration detection portion that detects vibration of a scraper portion having a plate that abuts against a surface of a roller disposed in a hot dip metal coating bath; and The vibration excitation unit generates vibrations that reproduce the amplitude changes of the vibrations detected by the vibration detection unit at a position away from the scraper unit, and determines the removal state of foreign matter present on the roller surface based on the generated vibrations.

2. The roller surface state determination assisting device according to claim 1, in, A conversion unit is further provided for converting the first state into a second state generated by the excitation unit when the state of the vibration detected by the vibration detection unit is set to a first state.

3. A device for removing impurities from a roller surface, comprising: a scraper portion having a plate that contacts the surface of a roller placed in a hot dip metal coating bath to remove impurities on the roller surface; and The roller surface state determination assisting device according to claim 1 or 2.

4. A device for removing impurities from a roller surface, comprising: A scraper portion having a plate piece that contacts the surface of a roller placed in a hot dip metal bath to remove impurities on the roller surface; A vibration detection unit for detecting the vibration of the scraper unit; A driving unit, which moves the scraper unit along the axial direction of the roller; a vibration exciting section that generates vibrations that reproduce the amplitude changes of the vibrations detected by the vibration detecting section at a position away from the scraper section, and determines the removal state of impurities present on the roller surface based on the generated vibrations; and a movement control unit that controls the driving unit based on the amplitude indicating the strength of the vibration detected by the vibration detection unit so as to move the scraper unit to a predetermined position in the axial direction of the roller to remove the impurities; The movement control unit determines that impurities are attached when the detection result from the vibration detection unit, i.e., the amplitude of the vibration exceeds a threshold value for more than a specified number of times within a specified time, and determines that the removal of impurities on the roller surface is completed when the amplitude of the vibration exceeds a threshold value for more than a specified number of times within a specified time, and moves the scraper unit to other positions in the axial direction of the roller when the amplitude of the vibration exceeds a threshold value for more than a specified number of times.

5. The device for removing impurities from the roller surface according to claim 3 or 4, in, The hot dip metallization bath is a hot dip galvanizing bath.

6. A method for removing impurities from a roller surface, include: a contacting step of bringing the sheet provided with the scraper portion of the sheet into contact with the surface of a roller provided in a hot dip metal bath; a vibration detection step of detecting vibration generated in the scraper portion; a state determination step of determining, at a position away from the scraper portion, a removal state of impurities present on the surface of the roller based on an amplitude indicating the strength of the vibration detected in the vibration detection step; a position changing step of controlling the position of the scraper portion in the axial direction of the roller based on the detected amplitude of the vibration; an exciting vibration reproducing step of generating, at a position away from the scraper portion, a vibration that reproduces the amplitude change of the vibration detected by the vibration detecting step, and determining the removal state of impurities present on the roller surface based on the generated vibration; as well as a removal step of removing the impurities by the scraper section based on the determined state of impurity removal; If, within a specified time, the detection result detected in the vibration detection process, i.e., the amplitude of the vibration exceeds a threshold value for more than a specified number of times, it is determined that impurities are attached; if it is below the specified number of times, it is determined that the removal of impurities on the roller surface is completed, and the scraper portion is moved to other positions in the axial direction of the roller.

7. The method for removing impurities from the roller surface according to claim 6, in, The hot dip metallization bath is a hot dip galvanizing bath.

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