Black light lamp holder for fluorescent penetrant detection
By designing a black light lamp holder for the inspection of aero-engine parts, the problem of adjusting the black light lamp in different sizes and inspection areas was solved, realizing automatic adjustment of the black light lamp and measurement of light intensity, thus improving the convenience and accuracy of inspection.
Patent Information
- Application Number
- CN202520271856.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-19
AI Technical Summary
In the existing technology, black light lamps are difficult to adjust to different sizes and inspection areas in the inspection of aero-engine parts, resulting in a heavy burden on inspection personnel, and the performance degradation of black light lamps requires frequent measurement and adjustment.
A black light lamp holder comprising a base, a lifting device, a horizontal rotation device, and a measuring device was designed. It can automatically adjust the height and position of the black light lamp, and the measuring device ensures that the light intensity meets the detection requirements.
It enables convenient movement of black lights and automatic measurement of light intensity, reducing the workload and time of inspection personnel and ensuring the accuracy and efficiency of inspection.
Smart Images

Figure CN223597521U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to aero -engine nondestructive testing technical field, specifically, relate to a kind of for fluorescent penetrant testing black light lamp stand. BACKGROUND
[0002] Penetrant testing is one of five general nondestructive testing techniques, and has a wide range of applications in aerospace, automotive, petroleum and other fields. In the manufacturing, testing, assembly, service, maintenance and repair stages of aero-engines, the proportion of fluorescent penetrant testing is far more than 50%, and it is the most widely used detection method. It is an important measure to ensure the safety of key components of aero-engines. In the process of penetrant testing, black light is an essential instrument and equipment. In order to ensure the accuracy of penetrant testing, the light intensity of black light on the surface of the part is strictly regulated. However, the size and shape of aero-engine parts are different, and the detection area needs to be moved frequently. The performance of black light will decrease with the increase of use time. For the above reasons, in order to ensure the accuracy of fluorescent penetrant testing, it is necessary to test the black light intensity of black light at a certain distance every day, and the position of black light needs to be adjusted according to the size of the part and the detection area. Under the existing conditions, it is difficult for fixed lamp stand to meet the detection requirements, and manual detection is often needed, which causes great burden to the detection personnel. SUMMARY
[0003] The following gives a brief summary of one or more aspects to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all contemplated aspects, and neither is it intended to identify key or critical elements of all aspects nor to delineate the scope of any or all aspects. Its only purpose is to present some concepts of one or more aspects in a simplified form, as a prelude to the more detailed description given later.
[0004] The utility model aims to, for example, provide a black light lamp stand for fluorescent penetrant testing, which can improve the problem of testing the black light intensity of black light at a certain distance every day to ensure the accuracy of fluorescent penetrant testing.
[0005] The embodiments of the utility model can be implemented as follows:
[0006] The embodiment of the utility model provides a black light lamp stand for fluorescent penetration detection, including base, elevating gear, horizontal rotating device and measuring device, elevating gear is fixed on base, horizontal rotating device is horizontally articulated on elevating gear, horizontal rotating device can rotate horizontally around elevating gear and can make elevating motion under the drive of elevating gear, one end of horizontal rotating device away from elevating gear is used for installing black light lamp, measuring device is arranged on elevating gear, measuring device is used for measuring the height of black light lamp filter and detection plane.
[0007] In addition, the black light lamp stand for fluorescent penetration detection provided by the embodiment of the utility model can also have the following additional technical features:
[0008] Optionally, the elevating device comprises a lead screw, a housing and a fixing knob; the lead screw is vertically fixed on the base, the housing is slidingly fitted with the lead screw in the vertical direction, and the fixing knob is threadedly connected with the housing; the fixing knob is used for abutting and fixing with the lead screw during rotation or being separated.
[0009] Optionally, the measuring device comprises a height scale bar and a pointer; the height scale bar is arranged on the lead screw in the vertical direction, and the pointer is horizontally fixed on the housing; a plane where the pointer is located is the same horizontal plane as a plane where the lowest point of the black light lamp filter is located; the pointer is used for moving up and down along the lead screw with the housing and pointing to different height scale bars.
[0010] Optionally, the housing is provided with an observation window; the observation window corresponds to the position of the height scale bar, and the observation window is used for exposing the height scale bar outward.
[0011] Optionally, the pointer is horizontally arranged in the observation window; the position of the pointer in the height direction is adjustable, so that the plane where the pointer is located is the same horizontal plane as the plane where the lowest point of the black light lamp filter is located.
[0012] Optionally, the horizontal rotating device comprises a support, a loading rack and a handle; the support is horizontally articulated with the elevating device, the loading rack is horizontally articulated with the support, and the handle is detachably inserted with the loading rack; the handle is used for installing the black light lamp downward.
[0013] Optionally, the support comprises a first support and a second support; the first support and the second support are fixed at an angle; one end of the first support and one end of the second support are both horizontally articulated with the elevating device; and one end of the loading rack away from the handle is horizontally articulated with one end of the first support away from the elevating device.
[0014] Optionally, the horizontal rotating device further comprises a detachable support, and the number of the detachable support is at least one.
[0015] Optionally, the loading frame is of telescopic structure.
[0016] Optionally, the black light lamp holder for fluorescent penetrant testing further comprises a black paint layer, and the outer surfaces of the base, the lifting device, the horizontal rotating device and the measuring device are coated with the black paint layer.
[0017] The black light lamp holder for fluorescent penetrant testing has the following beneficial effects, for example:
[0018] The black light lamp holder for fluorescent penetrant testing comprises a base, a lifting device, a horizontal rotating device and a measuring device, the lifting device is fixed on the base, the horizontal rotating device is horizontally hinged on the lifting device, the horizontal rotating device can rotate horizontally around the lifting device and can move up and down under the driving of the lifting device, and one end of the horizontal rotating device away from the lifting device is used for installing a black light lamp.
[0019] The measuring device can measure the distance between the black light lamp filter and the detection plane, can measure the light intensity of the black light lamp at a specific distance, ensures that the performance of the black light lamp meets the detection requirements, and saves the energy and time of the detection personnel without the need to find a support and a measuring tool every day to measure the light intensity. BRIEF DESCRIPTION OF DRAWINGS
[0020] The above features and advantages of the present application can be better understood after reading the detailed description of embodiments of the present application in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale and components having similar related functions or features can have the same or similar reference numbers.
[0021] Figure 1 A structural schematic view of the black light lamp holder for fluorescent penetrant testing provided by the embodiments of the present application is shown in the figure.
[0022] Figure 2 A structural schematic view of the lifting device in the black light lamp holder for fluorescent penetrant testing provided by the embodiments of the present application is shown in the figure.
[0023] Figure 3 A structural schematic view of the horizontal rotating device in the black light lamp holder for fluorescent penetrant testing provided by the embodiments of the present application is shown in the figure.
[0024] Figure 4 The structure schematic view of horizontal hinged structure in the black light lamp stand for fluorescent penetrant testing is provided for the embodiment of the utility model;
[0025] Figure 5 The structure schematic view of detachable support in the black light lamp stand for fluorescent penetrant testing is provided for the embodiment of the utility model;
[0026] Figure 6 The structure schematic view of black light lamp and loading rack in the black light lamp stand for fluorescent penetrant testing is provided for the embodiment of the utility model.
[0027] Icon: 10-black light lamp stand for fluorescent penetrant testing;100-base;200-lifting device;210-screw;220-outer shell;221-observation window;230-fixing knob;300-horizontal rotating device;310-support;311-first support;312-second support;320-loading rack;330-detachable support;400-measuring device;410-height scale;420-pointer;500-handle;510-black light lamp. DETAILED DESCRIPTION
[0028] The utility model will be described in detail below in combination with the drawings and specific embodiments. Note that the aspects described below in combination with the drawings and specific embodiments are only exemplary and should not be understood as limiting the scope of protection of the utility model.
[0029] In the description of the utility model, it should be noted that if the terms "upper", "lower", "inner", "outer", "vertical" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, and not the orientation or positional relationship of the device or element indicated or implied, therefore, it should not be understood as a limitation of the utility model.
[0030] At the same time, it should be noted that if the terms "first", "second" and the like are used only for differentiation description, and should not be understood as indicating or implying relative importance.
[0031] In the description of the utility model, it should also be noted that unless otherwise specified or limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, integrally connected, or detachably connected;It can be mechanically connected, or electrically connected;It can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements, etc. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0032] The following describes the black light lamp stand 10 for fluorescent penetrant testing provided by the embodiment in detail. Figures 1 to 6 The black light lamp stand 10 for fluorescent penetrant testing provided by the embodiment is described in detail.
[0033] Please refer to Figure 1 The embodiment of the utility model provides a kind of black light lamp stand 10 for fluorescent penetrant testing, including base 100, lifting device 200, horizontal rotating device 300 and measuring device 400, lifting device 200 is fixed on base 100;Horizontal rotating device 300 is horizontally hinged on lifting device 200, horizontal rotating device 300 can rotate around lifting device 200 horizontally and can be lifted and descended under the drive of lifting device 200, and the end of horizontal rotating device 300 away from lifting device 200 is used to install black light 510;Measuring device 400 is arranged on lifting device 200, and measuring device 400 is used to measure the height of filter piece of black light 510 and detection plane.
[0034] It should be noted that: nondestructive testing is to detect whether defects or non-uniformity exist in the detected object by using the physical properties of the substance without damaging or affecting the use performance of the detected object, and to give information such as defect size, position, nature and quantity. Penetrant testing is a nondestructive testing method for detecting various discontinuities on the surface of a part by applying a liquid penetrant. Black light 510, also known as ultraviolet lamp, produces ultraviolet light with a wavelength range of 330-390 nm, which is used for observing defects in fluorescent penetrant testing.
[0035] During penetrant testing, the light intensity of black light 510 irradiating on the surface of the part needs to be strictly controlled, so the relative position of black light 510 and the part needs to be adjusted constantly to ensure that the light intensity of the detected surface of the part meets the detection requirements.
[0036] The black light lamp stand 510 for fluorescent penetrant testing provided by the embodiment has the following advantages: the base 100 plays the role of counterweight, so that the lamp stand with black light 510 will not tilt or fall. The lifting device 200 can adjust the height of the horizontal rotating device 300 and the black light 510, and the measuring device 400 can detect and ensure the height of the black light 510, so that the light intensity of the black light 510 can be measured at a specific distance, and the performance of the black light 510 can meet the detection requirements without the need to find a support and measuring tool every day to measure the light intensity, saving the energy and time of the detection personnel. The horizontal rotating device 300 can adjust the black light 510 in horizontal direction. By adjusting the black light 510 in horizontal and vertical directions, the detection area is adjusted to ensure that the light intensity of the detected surface meets the requirements.
[0037] Refer to Figure 1In the embodiment, the edge of the base 100 is a circular structure. Specifically, the base 100 is in a cylindrical shape, and the circular base ensures that the penetration detection will not cause harm to the detection personnel due to the edges in a darkroom environment.
[0038] With reference to Figure 1 In the embodiment, the lifting device 200 includes a lead screw 210, a housing 220, and a fixing knob 230. The lead screw 210 is vertically fixed on the base 100, the housing 220 is in sliding fit with the lead screw 210 in the vertical direction, and the fixing knob 230 is in threaded connection with the housing 220. The fixing knob 230 is used to abut against and fix the lead screw 210 during rotation or to be separated from the lead screw 210.
[0039] The lead screw 210 and the fixing knob 230 can realize the lifting of the black light lamp 510. The fixing knob 230 can be rotated clockwise and counterclockwise, and in cooperation with the lead screw 210, the lifting device 200 can be raised or lowered, so as to change the height of the black light lamp 510 from the detection plane or the surface of the detected part.
[0040] When the fixing knob 230 is screwed, the end of the fixing knob 230 abuts against the lead screw 210, the position of the housing 220 relative to the lead screw 210 is fixed, and the height position adjustment of the black light lamp 510 is completed. When the fixing knob 230 is unscrewed, the housing 220 can move relative to the lead screw 210, the height of the black light lamp 510 is adjusted, and after the adjustment is completed, the fixing knob 230 is screwed.
[0041] Specifically, the housing 220 adopts a hollow cylindrical structure, and the housing 220 is sleeved outside the lead screw 210.
[0042] With reference to Figure 1 In the embodiment, the measuring device 400 includes a height scale 410 and a pointer 420. The height scale 410 is arranged on the lead screw 210 in the vertical direction, and the pointer 420 is fixed horizontally on the housing 220. The plane where the pointer 420 is located is the same horizontal plane as the lowest point of the filter of the black light lamp 510. The pointer 420 is used to move up and down along the lead screw 210 with the housing 220 and point to different height scales 410.
[0043] The height scale 410 is used to display the height of the specific position relative to the detection plane. The position of the pointer 420 is in the same horizontal plane as the position of the black light lamp 510, and the position indicated by the pointer 420 is the height position of the filter of the black light lamp 510. Therefore, the pointer 420 can indicate the height of the black light lamp 510. The measuring device 400 adopts the pointer 420, and the height of the filter of the black light lamp 510 from the detection plane can be conveniently observed.
[0044] With reference to Figure 1 and Figure 2In the embodiment, the shell 220 is provided with an observation window 221; the observation window 221 corresponds to the position of the height scale bar 410, and the observation window 221 is used to expose the height scale bar 410 outward. Specifically, the observation window 221 is rectangular.
[0045] An observation window 221 is opened on the shell 220, and is provided with a pointer 420, wherein the pointer 420 is in the same horizontal position as the bulb of the black light 510, as shown in the figure. Figure 1 During the lifting process, the pointer 420 of the observation window 221 points to the height scale bar 410, and the height of the filter piece of the black light 510 from the detection plane can be conveniently observed.
[0046] Referring to Figure 1 and Figure 2 In the embodiment, the pointer 420 is horizontally arranged on the observation window 221, and the position of the pointer 420 along the height direction is adjustable, so that the plane on which the pointer 420 is located is in the same horizontal plane as the plane on which the lowest point of the filter piece of the black light 510 is located.
[0047] Different models of black lights 510 have slight differences in size. The pointer 420 can be made movable to ensure that it is in the same horizontal position as the bulb of the black light 510, so as to adapt to different models of black lights 510. The position of the pointer 420 can be adjusted according to the size of the black light 510, so that the horizontal position of the pointer 420 is always in the same horizontal plane as the lowest point of the filter piece of the black light 510, and the pointer 420 can always represent the height position of the filter piece of the black light 510.
[0048] Referring to Figure 1 In the embodiment, the horizontal rotating device 300 includes a support 310, a loading frame 320, and a handle 500; the support 310 is horizontally hinged to the lifting device 200, the loading frame 320 is horizontally hinged to the support 310, and the handle 500 is detachably inserted into the loading frame 320, and the handle 500 is used to install the black light 510 downward.
[0049] Horizontal hinging is a connection mode that locks a component or a rod body in a certain horizontal position and allows it to rotate freely in a horizontal plane. This connection mode allows the connected components to rotate relative to each other while maintaining stability.
[0050] The support 310 can rotate horizontally relative to the lifting device 200, and the loading frame 320 rotates synchronously with the support 310. In addition, the loading frame 320 can also rotate relative to the support 310. The other end 3-2-2 of the loading frame 320 can be directly inserted into the insertion slot 4-1 of the handle 500 of the black light 510 for fixation, so as to realize convenient loading and unloading of the black light, as shown in the figure. Figure 6
[0051] Referring to Figure 1 andFigure 3 In this embodiment, the bracket 310 includes a first bracket 311 and a second bracket 312; the first bracket 311 and the second bracket 312 are fixed at an included angle, and one end of the first bracket 311 and one end of the second bracket 312 are both horizontally hinged to the lifting device 200. The end of the loading frame 320 away from the handle 500 is horizontally hinged to the end of the first bracket 311 away from the lifting device 200.
[0052] The bracket 310 has a triangular structure, which serves a stabilizing function. One end of the first bracket 311 is horizontally hinged to the outer shell 220, i.e., 3-1-1 and 2-2-3 are hinged together. One end of the second bracket 312 is horizontally hinged to the outer shell 220, i.e., 3-1-2 and 2-2-4 are hinged together. Figure 1 As shown in position A, the bracket 310 can be rotated in the horizontal direction.
[0053] When the detachable bracket 330 is not in use, the other end 3-1-3 of the bracket 310 is horizontally hinged to one end 3-2-1 of the loading frame 320, as follows: Figure 1 As shown in position B, it can enable the loading frame to rotate horizontally at 320 degrees.
[0054] In this embodiment, the rotational hinge method at positions A and B is shown in the figure. Figure 4 As shown. The outer casing 220 is equipped with a first socket 2-2-3 and a second socket 2-2-4. One end of the first bracket 311 is equipped with a first insert 3-1-1, and one end of the second bracket 312 is equipped with a second insert 3-1-2. The first insert 3-1-1 is inserted into the first socket 2-2-3 and then passes through a vertically positioned pin, allowing horizontal rotation around the pin. The other end of the first bracket 311 is equipped with a third socket 3-1-3, and one end of the loading rack 320 is equipped with a third insert 3-2-1. The third insert 3-2-1 is inserted into the third socket 3-1-3 and then passes through a vertically positioned pin, allowing horizontal rotation around the pin.
[0055] During the inspection process, the hinged connection between positions A and B allows for convenient horizontal movement of the black light 510, expanding the inspection range. After the inspection is completed, the black light 510 can be moved above the base to minimize its vertical diameter, preventing accidents such as bumps and injuries to personnel in the dark room.
[0056] Reference Figure 5 In this embodiment, the horizontal rotation device 300 further includes a detachable bracket 330; the number of detachable brackets 330 is at least one, and at least one detachable bracket 330 is detachably horizontally hinged between the bracket 310 and the loading frame 320.
[0057] Reference Figure 5When the detachable support 330 is used, one end of the detachable support 330 is provided with a fourth plug, the other end of the detachable support 330 is provided with a fourth socket, the fourth plug is inserted into the third socket 3-1-3 and is horizontally hinged through a pin, and the fourth socket is inserted into the third plug 3-2-1 of the loading rack 320 and is horizontally hinged through a pin. When a plurality of detachable supports 330 are arranged, the plurality of detachable supports 330 are sequentially horizontally hinged, and the two detachable supports 330 located at the outermost sides are respectively horizontally hinged with the first support 311 and the loading rack 320.
[0058] The third socket 3-1-3 of the first support 311 and the support 310 of the loading rack 320 can be connected with one or more detachable supports 330 through the hinge connection 1, and the hinge connection mode is as shown in Figure 4 The movement of the black light lamp 510 is more flexible, and the detection area is expanded, as shown in Figure 5
[0059] In the embodiment, the loading rack 320 has a telescopic structure. The loading rack 320 can be made into a telescopic structure to expand the detection area.
[0060] In the embodiment, the black light lamp holder 10 for fluorescent penetration detection further comprises a black paint layer; the outer surfaces of the base 100, the lifting device 200, the horizontal rotating device 300 and the measuring device 400 are coated with the black paint layer.
[0061] The entire black light lamp 510 lifting lamp holder shell 220 is coated with black paint, so that no reflection and fluorescent imaging occurs in the penetration detection darkroom environment, and the detection area is free from reflection and fluorescent pollution.
[0062] The black light lamp holder 10 for fluorescent penetration detection provided in the embodiment has the working principle of the black light lamp holder 10 for fluorescent penetration detection, which includes:
[0063] The measuring device 400 measures the distance between the filter of the black light lamp 510 and the detection plane, so that the light intensity of the black light lamp 510 can be measured at a specific distance, the performance of the black light lamp 510 meets the detection requirements, the light intensity does not need to be measured by searching for a support and a measuring tool every day, the energy and time of the detection personnel are saved, the black light lamp 510 can be conveniently moved in the horizontal direction and the vertical direction, the detection area can be continuously adjusted for different parts, and the working intensity of the detection personnel is greatly reduced.
[0064] The black light lamp holder 10 for fluorescent penetration detection provided in the embodiment has at least the following advantages:
[0065] The horizontal direction and height direction of the black light 510 can be effectively and conveniently adjusted, so that the detection area is adjusted, and the illumination intensity of the detected surface is ensured to meet the requirements; the distance measuring function is also provided, the black light intensity at a specific distance per day can be measured, the performance of the black light 510 is ensured to meet the detection requirements, it is not necessary to find a support and a measuring tool every day to measure the light intensity, and therefore the time and energy of the detection personnel are greatly saved.
[0066] The horizontal rotation device 300 with multiple supports 310 is adopted, the black light 510 is conveniently moved in the horizontal direction, and the light intensity of different detection areas can be ensured to meet the requirements for the detection of large parts.
[0067] The measuring device 400 is adopted, the distance between the filter of the black light 510 and the detection table surface can be accurately measured, the black light 510 can be accurately lifted, and the light intensity of the black light 510 at a specific distance can be measured.
[0068] The screw rod 210 lifting device 200 is adopted, the black light 510 is conveniently moved in the vertical direction, and the light intensity of the detected surface of parts of different sizes can be ensured to meet the requirements.
[0069] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. A black light lamp holder for fluorescent penetrant inspection, characterized by, It comprises: a base; a lifting device fixed on the base; a horizontal rotating device horizontally hinged on the lifting device, which can rotate horizontally around the lifting device and can make lifting movement under the driving of the lifting device, and the end of the horizontal rotating device away from the lifting device is used for installing a black light lamp; and a measuring device arranged on the lifting device, which is used for measuring the height of the black light lamp filter and the detection plane.
2. The black light lamp stand for fluorescent penetrant testing according to claim 1, wherein: the lifting device comprises a lead screw, a housing and a fixing knob; the lead screw is vertically fixed on the base, the housing is slidingly fitted with the lead screw in the vertical direction, and the fixing knob is threadedly connected with the housing, which is used for being fixed against the lead screw during rotation or being separated.
3. The black light lamp stand for fluorescent penetrant testing according to claim 2, wherein: the measuring device comprises a height scale and a pointer; the height scale is arranged on the lead screw in the vertical direction, and the pointer is horizontally fixed on the housing, the plane where the pointer is located is the same horizontal plane as the plane where the lowest point of the black light lamp filter is located, and the pointer is used for moving up and down along the lead screw with the housing and pointing to different height scales.
4. The black light lamp stand for fluorescent penetrant testing according to claim 3, wherein: the housing is provided with an observation window; the observation window corresponds to the position of the height scale, and the observation window is used for exposing the height scale outward.
5. The black light lamp stand for fluorescent penetrant testing according to claim 4, wherein: the pointer is horizontally arranged in the observation window, and the position of the pointer in the height direction is adjustable, so that the plane where the pointer is located is the same horizontal plane as the plane where the lowest point of the black light lamp filter is located.
6. The black light lamp stand for fluorescent penetrant testing according to any one of claims 1-5, wherein: the horizontal rotating device comprises a support, a loading rack and a handle; the support is horizontally hinged with the lifting device, the loading rack is horizontally hinged with the support, and the handle is detachably inserted with the loading rack, and the handle is used for downwardly installing the black light lamp.
7. The black light lamp stand for fluorescent penetrant testing according to claim 6, wherein: the support comprises a first support and a second support; the first support and the second support are fixed at an angle, one end of the first support and one end of the second support are both horizontally hinged with the lifting device, and one end of the loading rack away from the handle is horizontally hinged with one end of the first support away from the lifting device.
8. The black light lamp stand for fluorescent penetrant testing according to claim 6, wherein: the horizontal rotating device further comprises a detachable support; the number of the detachable supports is at least one, and at least one detachable support is detachably horizontally hinged between the support and the loading rack.
9. The black light lamp holder for fluorescent penetrant testing according to claim 6, characterized in that: the loading frame is a telescopic structure.
10. The black light lamp holder for fluorescent penetrant testing according to any one of claims 1-5, characterized in that: the black light lamp holder for fluorescent penetrant testing further comprises a black paint layer; the outer surfaces of the base, the lifting device, the horizontal rotating device and the measuring device are coated with the black paint layer.