JP2019015614A - Coating film inspection device - Google Patents
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Abstract
Description
本発明は塗装金属板の塗膜の有無を検査する塗膜検査装置に関する。 The present invention relates to a coating film inspection apparatus for inspecting the presence or absence of a coating film on a coated metal plate.
金属板の製造では、金属板に求められる機能に応じた塗料が表面に塗装される。機能発現のために塗料は必要な膜厚で塗装され、その後乾燥により塗膜となる。
塗装プロセスには、種々の塗装方法があるが、帯状金属板に対しては、接触式のロールコータ方式や非接触式のカーテンコータ方式などが用いられる。いずれの方式においても、塗膜は帯状金属板の表面に連続的に形成される。
In the manufacture of a metal plate, a paint corresponding to the function required for the metal plate is applied to the surface. The paint is applied with a necessary film thickness for function expression, and then dried to form a coating film.
There are various painting methods in the painting process. For the strip metal plate, a contact type roll coater method or a non-contact type curtain coater method is used. In either method, the coating film is continuously formed on the surface of the belt-shaped metal plate.
帯状金属板の製造、とりわけ帯状鋼板の製造では、工場の入側で先行コイルと後行コイルを溶接して連続して製造が行われる。このような帯状鋼板に塗装を施す場合には、先行コイルと後行コイルの溶接時に塗装を一時中断し、溶接終了後に塗装を再開するという工程をとる場合がある。このとき、溶接に伴う塗装の停止と再開を手動操作で行えば、塗装再開の操作遅れや操作忘れにより、帯状鋼板の搬送方向（長手方向）の一部に未塗装部分が発生する虞がある。
このため、塗装鋼板の出荷前に未塗装部分の確認が行われるが、この未塗装部分の確認は、塗装ライン出側に設けられた膜厚測定装置で行うことができる。膜厚測定装置の例として特許文献１〜３に記載のものが知られており、当該膜厚測定装置によって塗装鋼板の塗膜の膜厚を測定すると未塗装部分は膜厚がゼロとなるので、未塗装部分の確認を行うことができる。
In the manufacture of a strip-shaped metal plate, particularly the manufacture of a strip-shaped steel plate, the preceding coil and the succeeding coil are welded on the entrance side of the factory and are continuously manufactured. When coating such a strip-shaped steel sheet, there is a case where the coating is temporarily interrupted when the preceding coil and the succeeding coil are welded, and the coating is resumed after the welding is completed. At this time, if the paint is stopped and restarted by welding manually, there is a risk that an unpainted portion may occur in a part of the transport direction (longitudinal direction) of the strip steel plate due to a delay in the operation of restarting the paint or forgetting the operation. .
For this reason, confirmation of an unpainted part is performed before shipment of a coated steel plate, but confirmation of this unpainted part can be performed with the film thickness measuring apparatus provided in the coating line exit side. As an example of the film thickness measuring device, those described in
しかし、塗装装置から搬出された直後の帯板金属板は、その表面に塗装された塗料が乾燥していないウェット状態にある。このような状態にある場合、塗膜が安定していないため、膜厚測定装置によって膜厚を安定的に検知することは難しい。このため、従来の膜厚測定装置では、膜厚の測定は塗料が乾いて塗膜が安定するまで一定時間をおいてから行わなければならず、必然的に膜厚測定装置を塗装ライン出側の塗装装置から離れた所に配置することになる。また、塗料を乾かすために塗装装置の下流側に乾燥装置を設ける場合もあるが、この場合も塗装装置と膜厚測定装置との間に乾燥装置を設けるため、その分、膜厚測定装置を塗装装置から離れた所に配置することになる。
このように膜厚測定装置を塗装装置から離れた所に配置すると、膜厚測定装置により未塗装部分を検知した場合（膜厚ゼロの部分を検知した場合）には、塗装装置から膜厚測定装置までの距離に相当する帯状金属板の少なくとも一部に未塗装部分がある虞があるため、この距離に相当する鋼板を切り下げすることとなり、歩留り低下の原因になる。
金属板の切り下げ量を減少させ歩留り低下を防止するためには、膜厚測定装置を塗装装置に近付ければよいが、上述したように、膜厚の測定は塗料が乾いて塗膜が安定するまで一定時間をおいてから行わなければならないため、膜厚測定装置を塗装装置に近付けることは困難である。
However, the strip metal plate immediately after being carried out of the coating apparatus is in a wet state in which the paint applied to the surface thereof is not dried. In such a state, since the coating film is not stable, it is difficult to stably detect the film thickness with a film thickness measuring device. For this reason, in the conventional film thickness measuring device, the film thickness must be measured after a certain period of time until the paint dries and the coating film becomes stable. It will be placed away from the painting equipment. Also, in order to dry the paint, a drying device may be provided on the downstream side of the coating device. In this case, too, a drying device is provided between the coating device and the film thickness measuring device. It will be placed away from the painting equipment.
When the film thickness measuring device is arranged away from the coating device in this way, when an unpainted portion is detected by the film thickness measuring device (when a portion with zero film thickness is detected), the film thickness is measured from the coating device. Since there is a possibility that there is an unpainted portion in at least a part of the belt-shaped metal plate corresponding to the distance to the apparatus, the steel plate corresponding to this distance is cut down, which causes a decrease in yield.
In order to reduce the amount of cut down of the metal plate and prevent a decrease in yield, the film thickness measuring device may be brought closer to the coating device. However, as described above, the coating thickness is stabilized when the coating thickness is dried. Therefore, it is difficult to bring the film thickness measuring device close to the coating device.
塗装装置から搬出された直後の塗装金属板の塗膜の有無を検査することによって鋼板の切り下げ量を減少させることができるが、塗装装置から搬出された直後の塗装金属板の塗膜は塗料が乾燥していないウェット状態にあるため、このような状態の塗膜を検知するには非接触による検査が必要である。
そこで本発明者は、レーザ光を塗装金属板表面、より具体的には塗装鋼板表面に投光し反射した反射光から塗膜の有無を検知することができるのではないかと考え、以下のような実験を行った。
Although the amount of cut-down of the steel sheet can be reduced by inspecting the coated metal plate immediately after being unloaded from the coating device, the paint film on the painted metal plate immediately after being unloaded from the coating device Since it is in the wet state which is not dried, in order to detect the coating film of such a state, the inspection by non-contact is required.
Therefore, the present inventor considered that the presence or absence of the coating film could be detected from the reflected light reflected by projecting the laser beam on the surface of the coated metal plate, more specifically, on the surface of the coated steel plate. Experiments were conducted.
すなわちまず、塗料を塗装した塗装鋼板（ウェット状態の塗装鋼板）と未塗装の鋼板に対してレーザ光を投光し反射光をセンサで捉えて、その受光量を調査した。センサはキーエンス社製汎用タイプデジタルレーザセンサ（ヘッド：ＬＮ−ＮＨ４２型、アンプ：ＬＶ−Ｎ１１Ｎ型）を用いた。鋼板は６０ｋ鋼および４５ｋ鋼を用意し、それぞれ異なる塗料、膜厚で塗膜を形成した。また、受光量の調査は鋼板とセンサの相対角度を０°から７°まで１°ごとに変えて行った。なお、相対角度とは、鋼板表面に直交する線分と、センサと前記線分の鋼板表面の交点と結ぶ線分とのなす角度のことを言う。 That is, first, a laser beam was projected onto a coated steel sheet coated with paint (a wet coated steel sheet) and an uncoated steel sheet, and the reflected light was captured by a sensor, and the amount of received light was investigated. As a sensor, a general-purpose type digital laser sensor (head: LN-NH42 type, amplifier: LV-N11N type) manufactured by Keyence Corporation was used. As the steel plate, 60k steel and 45k steel were prepared, and coating films were formed with different paints and film thicknesses, respectively. Further, the amount of received light was investigated by changing the relative angle between the steel plate and the sensor from 0 ° to 7 ° every 1 °. The relative angle refers to an angle formed by a line segment orthogonal to the steel sheet surface and a line segment connecting the intersection of the sensor and the steel sheet surface with the line segment.
表１に、各相対角度における反射光の受光量（カウント数）について示す。
表１より、塗装鋼板の受光量が未塗装鋼板の受光量に比べいずれの相対角度においても大きいことが判明した。
From Table 1, it was found that the amount of light received by the coated steel plate was greater at any relative angle than the amount of light received by the uncoated steel plate.
また、図５に相対角度に対する塗装鋼板と未塗装鋼板の受光量差を示す。図５から受光量差は相対角度が４°以下で大きく、鋼板に対し４°以下となるようにセンサを設置し、適宜閾値を設定すれば容易に塗膜の有無を判別することができる。 FIG. 5 shows the difference in the amount of received light between the coated steel sheet and the uncoated steel sheet relative to the relative angle. From FIG. 5, it is possible to easily determine the presence or absence of a coating film by installing a sensor so that the difference in the amount of received light is large when the relative angle is 4 ° or less and 4 ° or less with respect to the steel sheet and appropriately setting a threshold value.
本発明は前記事情に鑑みてなされたもので、塗装金属板の塗膜の有無を塗料の乾燥前に容易に検査でき、これによって未塗装の鋼板の切り下げ量を減少させることができる塗膜検査装置を提供することを目的とする。 The present invention has been made in view of the above circumstances, and can easily inspect the presence or absence of a coating on a coated metal plate before drying the coating, thereby reducing the amount of uncut steel sheet cut-off. An object is to provide an apparatus.
前記目的を達成するために、本発明の塗膜検査装置は、塗装金属板の塗膜の有無を検査する塗膜検査装置であって、
金属板の表面に塗料を塗装する塗装装置と、この塗装装置によって前記金属板の表面に塗装された前記塗料を乾燥させる乾燥装置との間に設けられ、レーザ光を前記塗装金属板の表面に投光し反射した反射光から前記塗膜の有無を検査する塗膜センサを備えたことを特徴とする。
In order to achieve the above object, the coating film inspection apparatus of the present invention is a coating film inspection apparatus for inspecting the presence or absence of a coating film on a coated metal plate,
Provided between a coating device that paints the surface of the metal plate and a drying device that dries the paint applied to the surface of the metal plate by the coating device, and laser light is applied to the surface of the coated metal plate. A coating film sensor for inspecting the presence or absence of the coating film from reflected light reflected and projected is provided.
本発明においては、塗装装置と乾燥装置との間に、レーザ光を塗装金属板の表面に投光し反射した反射光から前記塗膜の有無を検査する塗膜センサを備えた塗膜検査装置が設けられているので、塗料が乾燥する前に塗膜の有無を容易に検査することができる。このため塗膜検査装置を従来の膜厚測定装置に比べ塗装装置に近付けることができる。したがって、塗装金属板に未塗装部分が生じていても、この未塗装部分は最大で塗装装置から塗膜検査装置までの距離に相当する部分であるため、従来に比して未塗装の金属板の切り下げ量を減少させることができ、よって塗装金属板の歩留り低下を防止できる。 In the present invention, a coating film inspection apparatus provided with a coating film sensor that inspects the presence or absence of the coating film from reflected light that is projected and reflected between the coating apparatus and the drying apparatus with laser light on the surface of the coated metal plate. Therefore, the presence or absence of a coating film can be easily inspected before the paint dries. For this reason, a coating-film inspection apparatus can be brought close to a coating apparatus compared with the conventional film thickness measuring apparatus. Therefore, even if there is an unpainted portion on the painted metal plate, this unpainted portion is the portion corresponding to the distance from the coating device to the coating film inspection device at the maximum. The amount of cut off can be reduced, so that the yield of the coated metal plate can be prevented from being lowered.
ところで、塗装金属板が幅方向に反ると（検査位置においてＣ反りが発生すると）、レーザ光の反射光を塗膜センサにて十分受光できなくなる場合がある。つまり、反ることで曲面となっている塗装金属板の表面にレーザ光を投光すると、その反射光の少なくとも一部が塗膜センサから外れ、反射光を塗膜センサにて十分受光できなくなる場合がある By the way, when the coated metal plate warps in the width direction (when C warpage occurs at the inspection position), the reflected light of the laser beam may not be sufficiently received by the coating film sensor. In other words, when laser light is projected onto the surface of a painted metal plate that is curved due to warping, at least a part of the reflected light comes off the coating film sensor, and the reflected light cannot be received sufficiently by the coating film sensor. Sometimes
このため本発明の前記構成において、前記塗膜センサを複数備え、
複数の前記塗膜センサが前記塗装金属板の板幅方向において扇状に配置されていてもよい。
For this reason, in the configuration of the present invention, a plurality of the coating film sensors are provided,
The plurality of coating film sensors may be arranged in a fan shape in the plate width direction of the painted metal plate.
このような構成によれば、複数の塗膜センサが塗装金属板の幅方向において扇状に配置されているので、塗装金属板が幅方向に反った場合でも、レーザ光の反射光を塗膜センサにて十分受光して、塗膜の有無を確実に検査することができる。 According to such a configuration, since the plurality of coating film sensors are arranged in a fan shape in the width direction of the coated metal plate, the reflected light of the laser beam is detected even when the coated metal plate is warped in the width direction. Can sufficiently receive the light and reliably inspect the presence or absence of the coating film.
本発明によれば、塗装金属板の塗膜の有無を塗料の乾燥前に容易に検査することができるので、未塗装の金属板の切り下げ量を減少させることができる。 According to the present invention, since the presence or absence of the coating film on the coated metal plate can be easily inspected before the coating is dried, the amount of uncut metal plate can be reduced.
以下、図面を参照して本発明に係る塗膜検査装置の実施の形態、より具体的には鋼板の塗膜検査装置の実施の形態について説明する。
図１Ａは、本実施の形態に係る塗膜検査装置を備えた塗装鋼板塗装ライン前段部の概略構成を模式的に示す図である。また、図１Ｂは、本実施の形態に係る塗膜検査装置を備えた塗装鋼板塗装ライン後段部の概略構成を模式的に示す図である。
Hereinafter, an embodiment of a coating film inspection apparatus according to the present invention, more specifically, an embodiment of a steel sheet coating film inspection apparatus will be described with reference to the drawings.
FIG. 1A is a diagram schematically showing a schematic configuration of a pre-stage portion of a coated steel sheet coating line provided with a coating film inspection apparatus according to the present embodiment. Moreover, FIG. 1B is a figure which shows typically schematic structure of the coated steel plate coating line latter part provided with the coating-film inspection apparatus which concerns on this Embodiment.
図１Ａに示すように、ライン前段部では、塗料が塗装される前の帯状鋼板Ｋはペイオフリール１に巻き付けられた状態にセットされる。このペイオフリール１から帯状鋼板Ｋは巻き出され、板巾方向を直線状に入側シャー３でカットされた後、順次塗装される。入側シャー３の後にはスポットウエルダー４が配置され、先行の帯状鋼板Ｋが途切れた場合には、スポットウエルダー４により先行の帯状鋼板Ｋの尾端部と後行の帯状鋼板Ｋの先端部とが溶接により接合され、連続性を保った製造が行われる。
そして、必要な表面処理、下地塗装などが行われた後、図１Ｂに示すように、ライン後段部では、塗装装置１３から搬出された塗装鋼板Ｋ１が乾燥装置１４によって乾燥され、オイラー１５によって表面にオイルが塗装されたうえで、テンションリール２に巻き取られる。
As shown in FIG. 1A, the strip steel plate K before the coating is applied is set in a state of being wound around the
Then, after the necessary surface treatment, base coating, etc. are performed, as shown in FIG. 1B, the coated steel plate K1 unloaded from the
本実施の形態では帯状鋼板Ｋの表面に塗料を塗装する塗装装置１３と、この塗装装置１３によって帯状鋼板Ｋの表面に塗装された塗料を乾燥させる乾燥装置１４との間に塗膜検査装置２０が設けられている。この塗膜検査装置２０は、例えば乾燥装置１４の入口側の前壁部にブラケット等を介して取り付けられている。
塗膜検査装置２０はレーザ光を塗装鋼板Ｋ１の表面に投光し反射した反射光から塗膜の有無を検査する複数の塗膜センサＣＨ１〜ＣＨ４を備えている。
すなわち、図２に示すように、本実施の形態では、塗膜検査装置２０は４個の塗膜センサＣＨ１〜ＣＨ４を備え、これら塗膜センサＣＨ１〜ＣＨ４が塗装鋼板Ｋ１の幅方向に扇状に配置されている。具体的には、塗装鋼板Ｋ１が幅方向において上凸に沿っている場合（つまり検査位置においてＣ反りが発生している場合）、反りが発生していない仮想の塗装鋼板Ｋ２の表面に直交する線分Ｌと、この線分Ｌの塗装鋼板Ｋ２の表面との交点をＯとすると、交点Ｏを中心として４個の塗膜センサＣＨ１〜ＣＨ４が扇状に配置されている。
In the present embodiment, the coating
The coating
That is, as shown in FIG. 2, in the present embodiment, the coating
線分Ｌと、各塗膜センサＣＨ１〜ＣＨ４と交点Ｏを結ぶ線分とのなす角度を、塗装鋼板Ｋ１に対する塗膜センサＣＨ１〜ＣＨ４の相対角度とすると、塗膜センサＣＨ２の相対角度は、反時計回りに４°、塗膜センサＣＨ３の相対角度は時計回りに４°、塗膜センサＣＨ１の相対角度は反時計回りに８°、塗膜センサＣＨ４の相対角度は時計回りに８°となる。また、交点Ｏと各塗膜センサＣＨ１〜ＣＨ４との直線距離は全て等しくなっている。
なお、図２においては、塗膜センサＣＨ１〜ＣＨ４を明確に図示するために上述した相対角度は実際より２倍程度大きくして図示している。
また、塗装鋼板Ｋ１が幅方向において下凸に沿っている場合も同様にして塗膜センサＣＨ１〜ＣＨ４を扇状に配置する。
When the angle formed by the line segment L and the line segment connecting each coating film sensor CH1 to CH4 and the intersection point O is the relative angle of the coating film sensors CH1 to CH4 with respect to the coated steel plate K1, the relative angle of the coating film sensor CH2 is: 4 ° counterclockwise, the relative angle of the coating film sensor CH3 is 4 ° clockwise, the relative angle of the coating film sensor CH1 is 8 ° counterclockwise, and the relative angle of the coating film sensor CH4 is 8 ° clockwise. Become. Further, the linear distances between the intersection point O and the coating film sensors CH1 to CH4 are all equal.
In FIG. 2, in order to clearly illustrate the coating film sensors CH1 to CH4, the relative angle described above is illustrated to be about twice as large as the actual one.
Similarly, the coated film sensors CH1 to CH4 are arranged in a fan shape when the coated steel plate K1 is along a downward projection in the width direction.
塗膜センサＣＨ１〜ＣＨ４はそれぞれ反射型のレーザセンサであり、レーザ光を発光する発光素子と、当該発光素子から発光されたレーザ光が検出物体である塗装鋼板Ｋ１の表面で反射して返ってきた反射光を受光する受光素子を備えている。
塗膜センサＣＨ１〜ＣＨ４はそれぞれ上述した相対角度で配置されているので、各塗膜センサＣＨ１〜ＣＨ４から発光されたレーザ光と塗装鋼板Ｋ１の表面との交点における接線は、各塗膜センサＣＨ１〜ＣＨ４から発光されるレーザ光の進行方向と略直交する。このため、各塗膜センサＣＨ１〜ＣＨ４から発光されたレーザ光はその殆どが塗装鋼板Ｋ１の表面で反射して返ってきてそれぞれ塗膜センサＣＨ１〜ＣＨ４に受光される。
塗膜センサＣＨ１〜ＣＨ４の相対角度は塗装鋼板Ｋ１の反り度合によって適宜設定される。反り度合が大きい場合、つまり塗装鋼板Ｋ１の曲率が大きいほど塗膜センサＣＨ１〜ＣＨ４の相対角度を大きく設定し、曲率が小さいほど塗膜センサＣＨ１〜ＣＨ４の相対角度を小さく設定する。塗装鋼板Ｋ１に反りが生じていない場合、塗膜センサは上述した線分Ｌ上に配置すればよい。
また、乾燥装置１４（図１参照）の近傍では塗膜検査装置２０の塗膜センサＣＨ１〜ＣＨ４がその動作保証温度以上になる可能性があることから、乾燥装置１４と塗膜センサＣＨ１〜ＣＨ４の間には熱風を遮断するための遮蔽板（図示略）を設置し温度対策が施されている。
Each of the coating film sensors CH1 to CH4 is a reflection type laser sensor, and the light emitting element that emits laser light and the laser light emitted from the light emitting element are reflected and returned from the surface of the coated steel plate K1 that is a detection object. A light receiving element for receiving the reflected light.
Since the coating film sensors CH1 to CH4 are arranged at the above-described relative angles, the tangent at the intersection between the laser light emitted from each coating film sensor CH1 to CH4 and the surface of the coated steel plate K1 is the respective coating film sensor CH1. ˜Approximately perpendicular to the traveling direction of the laser light emitted from CH4. For this reason, most of the laser beams emitted from the coating film sensors CH1 to CH4 are reflected by the surface of the coated steel plate K1 and received by the coating film sensors CH1 to CH4, respectively.
The relative angles of the coating film sensors CH1 to CH4 are appropriately set depending on the degree of warpage of the coated steel plate K1. When the degree of warping is large, that is, the relative angle of the coating film sensors CH1 to CH4 is set larger as the curvature of the coated steel plate K1 is larger, and the relative angle of the coating film sensors CH1 to CH4 is set smaller as the curvature is smaller. When the coated steel plate K1 is not warped, the coating film sensor may be disposed on the line segment L described above.
Further, in the vicinity of the drying apparatus 14 (see FIG. 1), the coating film sensors CH1 to CH4 of the coating
そして、上述した反りが発生している帯状鋼板Ｋ１に対し、図示しない塗装装置およびこの塗装装置の下流側に設けられている塗装装置１３によって２層（下層：狙い４．５ｇ/ｍ２、管理範囲２．０〜７．０ｇ/ｍ２、上層：狙い３．５ｇ/ｍ２、管理範囲１．５〜５．５ｇ/ｍ２）の塗膜を形成し、塗装装置１３によって上層の塗膜を形成するための塗料を塗装した後に塗膜センサＣＨ１〜ＣＨ４にて受光量の調査を行った。
実際に受光量を測定すると、図３に示すように、塗装鋼板Ｋ１が上下にばたつき（振動し）、受光量が変動することが判明した。なお、図３は塗膜センサＣＨ３による受光量の変動を示している。
この場合、受光量の低い未塗装部と受光量が高い塗装部との間の閾値が判別し難くなることから、受光量は各塗膜センサＣＨ１〜ＣＨ４において２秒間隔で連続的に測定し、３０秒間（２秒×１５データ）の移動平均値を受光量とし、塗装鋼板Ｋ１のばたつきの影響を排除した。その結果を図４に示す。なお、図４は塗膜センサＣＨ３による平均の受光量の変動を示している。
Then, two layers (lower layer: aim 4.5 g / m 2 , management) are applied to the strip-shaped steel plate K1 in which the warp is generated by a coating device (not shown) and a
When the amount of received light was actually measured, as shown in FIG. 3, it was found that the coated steel plate K1 fluctuated (vibrated) up and down, and the amount of received light varied. FIG. 3 shows the variation in the amount of light received by the coating film sensor CH3.
In this case, since it is difficult to determine a threshold value between an unpainted portion having a low received light amount and a painted portion having a high received light amount, the received light amount is continuously measured at intervals of 2 seconds in each of the coating film sensors CH1 to CH4. The moving average value for 30 seconds (2 seconds × 15 data) was taken as the amount of received light, and the influence of fluttering of the coated steel plate K1 was eliminated. The result is shown in FIG. FIG. 4 shows the variation in the average amount of received light by the coating film sensor CH3.
図４に示すように、未塗装部の受光量（相対値）は１０００〜１５００程度であるのに対し、塗装部の受光量（相対値）は、塗膜センサＣＨ１，ＣＨ２および塗膜センサＣＨ４で２０００〜３０００、塗膜センサＣＨ３で３０００〜５０００を示した。これにより適宜閾値を設定すれば、塗装／未塗装の判別は可能である。特に感度の最も高かった塗膜センサＣＨ３の結果を用いて判断すれば（複数の塗膜センサＣＨ１〜ＣＨ４のうち、最も受光量の高い塗膜センサＣＨ３を用いて塗装／未塗装の判別（塗膜の有無の判断）をすれば）、より誤作動なく塗装／未塗装の判別（塗膜の有無の判断）が可能である。 As shown in FIG. 4, the received light amount (relative value) of the unpainted portion is about 1000 to 1500, whereas the received light amount (relative value) of the painted portion is the coating film sensors CH1 and CH2 and the coating film sensor CH4. Of 2000 to 3000 and 3000 to 5000 of the coating film sensor CH3. Accordingly, if a threshold value is appropriately set, it is possible to discriminate between painted and unpainted. Judgment is made by using the result of the coating film sensor CH3 having the highest sensitivity (the coating film sensor CH3 having the highest light receiving amount among the plurality of coating film sensors CH1 to CH4). If it is determined whether or not there is a film), it is possible to distinguish between painted and unpainted (determination of the presence or absence of a coating film) without malfunction.
以上のように本実施の形態によれば、塗装装置１３と乾燥装置１４との間に、レーザ光を塗装鋼板Ｋ１の表面に投光し反射した反射光から塗膜の有無を検査する塗膜センサＣＨ１〜ＣＨ４を備えた塗膜検査装置２０が設けられているので、塗料が乾燥する前に塗膜の有無を容易に検査することができる。このため塗膜検査装置２０を従来の膜厚測定装置に比べ塗装装置１３に近付けることができる。したがって、塗装鋼板Ｋ１に未塗装部分が生じていても、この未塗装部分は最大で塗装装置１３から塗膜検査装置２０までの距離に相当する部分であるため、従来に比して未塗装の鋼板の切り下げ量を減少させることができ、よって塗装鋼板Ｋ１の歩留り低下を防止できる。
また、複数（４個）の塗膜センサＣＨ１〜ＣＨ４が、塗装鋼板Ｋ１の板幅方向において扇状に配置されているので、塗装鋼板Ｋ１が幅方向に反った場合でも、レーザ光の反射光を塗膜センサＣＨ１〜ＣＨ４にて十分受光して、塗膜の有無を確実に検査することができる。
As described above, according to the present embodiment, a coating film that inspects the presence or absence of a coating film from reflected light that is projected and reflected between the
In addition, since a plurality of (four) coating film sensors CH1 to CH4 are arranged in a fan shape in the plate width direction of the coated steel plate K1, even when the coated steel plate K1 is warped in the width direction, the reflected light of the laser beam is reflected. The coating film sensors CH1 to CH4 can sufficiently receive light to reliably inspect the presence or absence of the coating film.
１３ 塗装装置
１４ 乾燥装置
２０ 塗膜検査装置
ＣＨ１〜ＣＨ４ 塗膜センサ
Ｋ 帯状鋼板（金属板）
Ｋ１ 塗装鋼板（塗装金属板）
13
K1 Painted steel plate (painted metal plate)
Claims (2)
金属板の表面に塗料を塗装する塗装装置と、この塗装装置によって前記金属板の表面に塗装された前記塗料を乾燥させる乾燥装置との間に設けられ、レーザ光を前記塗装金属板の表面に投光し反射した反射光から前記塗膜の有無を検査する塗膜センサを備えたこと特徴とする塗膜検査装置。 A coating film inspection apparatus for inspecting the presence or absence of a coating film on a painted metal plate,
Provided between a coating device that paints the surface of the metal plate and a drying device that dries the paint applied to the surface of the metal plate by the coating device, and laser light is applied to the surface of the coated metal plate. A coating film inspection apparatus comprising a coating film sensor for inspecting the presence or absence of the coating film from reflected light reflected and projected.
複数の前記塗膜センサが、前記塗装金属板の板幅方向において扇状に配置されていることを特徴とする塗膜検査装置。 A plurality of the coating film sensors are provided,
The coating film inspection apparatus, wherein the plurality of coating film sensors are arranged in a fan shape in the plate width direction of the painted metal plate.
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| CN113125381A (en) * | 2020-01-15 | 2021-07-16 | 日涂(上海)涂料研究开发有限公司 | Detection method and comparison method for evaluating covering power of wet coating film and special pressing plate device thereof |
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