A method and device for measuring the thickness of dry paint film for steel structure installation and construction

Abstract

The present invention discloses a method and device for measuring the thickness of dry paint film for steel structure installation and construction, including a paint film thickness gauge housing, a storage component and a pressurizing component. A display screen is installed on the outside of the paint film thickness gauge housing, and operation buttons are located below the display screen on the surface of the paint film thickness gauge housing. At the same time, a paint film sensor is installed at the bottom of the paint film thickness gauge housing through a wiring harness. The storage component is installed inside the paint film thickness gauge housing, and the storage component is composed of a release seat, a transmission column, a mounting plate, a retaining spring, a mounting column, a limit seat, a locking rack and a locking gear. The method and device for measuring the thickness of dry paint film for steel structure installation and construction; start the external switch of a micro air pump, the micro air pump inflates the hose, so that the hose is straightened, and the wires and harness are straightened, so that the paint film sensor is no longer in a drooping state, and the paint film thickness is detected by extending the paint film sensor to the inside of a narrow space.

Description

Technical Field

[0001] The invention relates to the field of dry paint film thickness measurement, and in particular to a dry paint film thickness measurement method and device for steel structure installation and construction. Background Art

[0002] When testing the thickness of anti-corrosion paint on the surface of steel structure, a dry paint film thickness gauge is needed. The paint film thickness gauge is generally handheld and detects the thickness of anti-corrosion paint through the detection sensor at the end. It is used to detect some narrow places where the thickness gauge cannot enter. The wire connected to the sensor is soft, and the sensor needs to be supported by hand. In a narrow space where the hand cannot reach in, the detection sensor and the object being measured cannot be guaranteed to be in a vertical state, and the thickness of the anti-corrosion paint on the surface of the steel structure cannot be detected. Summary of the invention

[0003] In order to fill the gap in the market, the present invention provides a method and a device for measuring the thickness of a dry paint film used in steel structure installation and construction.

[0004] The object of the present invention is to provide a method and device for measuring the thickness of dry paint film for steel structure installation and construction, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method and device for measuring the thickness of dry paint film for steel structure installation and construction;

[0006] A method for measuring the thickness of a dry paint film used in steel structure installation and construction, the method of using the method comprising the following steps: detecting equipment, pressing a release seat, pulling a paint film sensor, starting a micro air pump and measuring the thickness of the paint film sensor:

[0007] Step A. Test the device: Turn on the device and observe whether the device can start up and operate normally;

[0008] Step B. Press the release seat: Press the release seat, and under the drive of the two sets of transmission columns, the locking rack and the locking gear are disengaged. At this time, pull the paint film sensor to pull the wiring harness;

[0009] Step C. Visually inspect the use length of the wire harness: Determine the use length of the wire harness by visually inspecting the depth of the narrow area. After the use length of the wire harness is determined, release the release seat to lock the length of the wire harness.

[0010] Step D. Start the micro air pump: The micro air pump inflates the hose to make the hose straighten, and straightens the wires and harnesses, so that the paint film sensor is no longer in a drooping state;

[0011] Step E. Measuring the thickness of the paint film sensor: By extending the paint film sensor to the inside of the narrow area, the thickness of the paint surface on the outside of the steel structure inside the narrow area is measured.

[0012] A dry paint film thickness measuring device for steel structure installation and construction, comprising a paint film thickness gauge housing, a storage component and a pressurizing component, a display screen is installed on the outer side of the paint film thickness gauge housing, and operation buttons are provided below the display screen on the surface of the paint film thickness gauge housing, and a paint film sensor is installed at the bottom of the paint film thickness gauge housing through a wiring harness, the storage component is installed inside the paint film thickness gauge housing, and the storage component is composed of a release seat, a transmission column, a mounting plate, a retaining spring, a mounting column, a limit seat, a locking rack and a locking gear, and the mounting column is movably arranged inside the paint film thickness gauge housing, and the mounting plate is fixedly arranged on the mounting column, a locking gear is installed at the bottom of the outer side of the mounting column, and a retaining spring is provided on the upper part of the outer side of the mounting column, and one end of the retaining spring is fixedly connected to the mounting column, and the other end of the retaining spring is fixed to the wiring harness, a wire is inserted inside the wiring harness, and one end of the wire is electrically connected to the paint film sensor, and the other end of the wire is electrically connected to a detection element inside the paint film thickness gauge;

[0013] The outer side of the paint film sensor includes a dust cover, and a stress strip arranged in an annular manner is fixedly arranged on the top of the dust cover, and a first sealing strip and a second sealing strip arranged in an annular manner are fixedly arranged inside the dust cover, and mounting holes are provided at the bottom of the cleaning seat and the outer side of the dust cover, and the two groups of mounting holes are connected by a connecting rope, and the paint film sensor and the dust cover are sealed by two groups of first sealing strips and second sealing strips made of rubber materials;

[0014] The pressurizing component consists of a micro air pump and a hose. The micro air pump is screwed inside the housing of the paint film thickness gauge. The inflation end of the micro air pump is connected to the hose, and the hose is installed together with the wire inside the wiring harness.

[0015] Furthermore, the axial cross-sections of the mounting plate and the retaining spring are concentric circle structures, and the mounting plate and the locking gear are concentric circle structures, and the mounting plate is a circular structure made of plastic material.

[0016] Furthermore, a notch is opened on the right side of the paint film thickness gauge housing, and a release seat is arranged inside the notch. At the same time, the end of the release seat is fixed to the transmission column, and the end of the transmission column away from the release seat is inserted into the limit hole opened inside the limit seat, and the bottom of the limit seat is screwed into the inside of the paint film thickness gauge housing.

[0017] Furthermore, the transmission columns are arranged in two groups, and locking racks are fixedly installed on the left sides of the surfaces of the two groups of transmission columns, and the locking gears are arranged between the two groups of transmission columns.

[0018] Furthermore, return springs are installed on both sets of transmission columns, and the locking racks on the two sets of transmission columns are adapted to the sizes of the locking gears, and the locking racks and the locking gears are meshed and connected.

[0019] Furthermore, a cleaning seat is installed at the bottom of the paint film thickness gauge housing, and the cleaning seat is composed of a fixing cylinder, a positioning seat, a positioning groove, a fixing bolt, a fixing seat, a brush and a positioning plate, and the fixing cylinder is screwed to the bottom of the paint film thickness gauge housing.

[0020] Furthermore, the fixing tube is made of plastic material and has a circular cross-section, and two groups of fixing tubes are evenly installed on the inner wall of the fixing tube, and a positioning groove is provided inside the fixing tube.

[0021] Furthermore, a fixing seat is installed inside the fixing cylinder, and a brush is fixedly installed on the inner wall of the fixing seat. The brush is cylindrical, and the middle part of the brush has a size smaller than the cleaning hole of the wiring harness. Two groups of positioning plates are evenly installed on the outside of the fixing seat, and the two groups of positioning plates are respectively inserted into the inside of the two groups of positioning grooves and are mechanically screwed and fixed by hexagon socket bolts.

[0022] The dry paint film thickness measuring device is used through a dry paint film thickness measuring method for steel structure installation construction.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The handheld paint film sensor drags the wire harness out from the inside of the paint film thickness gauge housing. The depth of the narrow position can be detected according to the need to determine the length of the wire harness, which is more applicable.

[0025] Start the external switch of the micro air pump, and the micro air pump will inflate the hose to make it straight, and straighten the wires and harnesses so that the paint film sensor is no longer in a hanging state. The paint film thickness can be detected by extending the paint film sensor to the inside of a narrow space; the paint film sensor and the object to be measured are guaranteed to be in a vertical state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view schematic diagram of the structure of the present invention;

[0027] Figure 2 A schematic diagram of the cross-sectional structure of a paint film thickness gauge of the present invention;

[0028] Figure 3 It is a schematic diagram of the storage component structure of the present invention;

[0029] Figure 4 The structure of the present invention Figure 3 AA section structure schematic diagram in;

[0030] Figure 5 A schematic diagram of the cleaning seat structure of the present invention;

[0031] Figure 6 A schematic diagram of the cross-sectional structure of the cleaning seat of the present invention;

[0032] Figure 7 The structure of the present invention Figure 5 Exploded diagram of

[0033] Figure 8 A schematic diagram of the internal structure of the wiring harness of the present invention;

[0034] Fig. 9 The structure of the present invention Figure 8 Schematic diagram of the cross-sectional structure.

[0035] In the figure: 1. Paint film thickness gauge housing; 2. Storage component; 21. Release seat; 22. Transmission column; 23. Mounting plate; 24. Retaining spring; 25. Mounting column; 26. Limit seat; 27. Locking rack; 28. Locking gear; 29. ​​Reset spring; 3. Wiring harness; 31. Wire; 4. Paint film sensor; 41. Force strip; 42. Dust cover; 43. First sealing strip; 44. Second sealing strip; 45. Connecting rope; 46. Mounting hole; 5. Cleaning seat; 51. Fixing cylinder; 52. Positioning seat; 53. Positioning groove; 54. Fixing bolt; 55. Fixing seat; 56. Brush; 57. Positioning plate; 6. Pressurizing component; 61. Micro air pump; 62. Hose. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention provides a technical solution: a method and device for measuring the thickness of dry paint film for steel structure installation and construction;

[0038] Specific implementation method 1: A method for measuring the thickness of dry paint film for steel structure installation and construction, the method of use of which includes the following steps: testing equipment, pressing the release seat 21, pulling the paint film sensor 4, starting the micro air pump 61 and the paint film sensor 4 to measure the thickness:

[0039] Step A. Test the device: Turn on the device and observe whether the device can start up and operate normally;

[0040] Step B. Pressing the release seat 21: Pressing the release seat 21, driven by the two sets of transmission columns 22, causes the locking rack 27 and the locking gear 28 to disengage, and at this time, pulling the paint film sensor 4 can pull the wiring harness 3;

[0041] Step C. Visually inspecting the use length of the wire harness 3: Determine the use length of the wire harness 3 by visually inspecting the depth of the narrow area. After the use length of the wire harness 3 is determined, release the release seat 21 to lock the length of the wire harness 3.

[0042] Step D. Start the micro air pump 61: The micro air pump 61 inflates the hose 62 so that the hose 62 is straightened, and the wire 31 and the harness 3 are straightened so that the paint film sensor 4 is no longer in a drooping state;

[0043] Step E. The paint film sensor 4 performs thickness measurement: by extending the paint film sensor 4 to the inside of the narrow area, the thickness of the paint surface on the outside of the steel structure inside the narrow area is measured.

[0044] Specific implementation method 2: Please refer to Figure 1-9 A dry paint film thickness measuring device for steel structure installation construction includes a paint film thickness gauge housing 1, a storage component 2 and a pressurizing component 6. A display screen is installed on the outside of the paint film thickness gauge housing 1, and operation buttons are located below the display screen on the surface of the paint film thickness gauge housing 1. At the same time, a paint film sensor 4 is installed at the bottom of the paint film thickness gauge housing 1 through a wiring harness 3. The storage component 2 is installed inside the paint film thickness gauge housing 1, and the storage component 2 is composed of a release seat 21, a transmission column 22, a mounting plate 23, a retaining spring 24, a mounting column 25, a limit seat 26, and a locking rack 27. and a locking gear 28, while the mounting column 25 is movably arranged inside the paint film thickness gauge housing 1, and the mounting plate 23 is fixedly arranged on the mounting column 25, the locking gear 28 is installed at the outer bottom of the mounting column 25, and the outer upper part of the mounting column 25 is provided with a retaining spring 24, while one end of the retaining spring 24 is fixedly connected to the mounting column 25, and the other end of the retaining spring 24 is fixed to the wiring harness 3, the wiring harness 3 is inserted with a wire 31, and one end of the wire 31 is electrically connected to the paint film sensor 4, and the other end of the wire 31 is electrically connected to the detection element inside the paint film thickness gauge;

[0045] The outer side of the paint film sensor 4 includes a dust cover 42, and a ring-shaped force strip 41 is fixedly arranged on the top of the dust cover 42, and a first sealing strip 43 and a second sealing strip 44 are fixedly arranged inside the dust cover 42. At the same time, a mounting hole 46 is opened at the bottom of the cleaning seat 5 and the outer side of the dust cover 42, and the two groups of mounting holes 46 are connected by a connecting rope 45. At the same time, the paint film sensor 4 and the dust cover 42 are sealed by two groups of first sealing strips 43 and second sealing strips 44 made of rubber materials;

[0046] The pressurizing component 6 consists of a micro air pump 61 and a hose 62 , and the micro air pump 61 is screwed inside the paint thickness gauge housing 1 , while the inflation end of the micro air pump 61 is connected to the hose 62 , and the hose 62 is installed together with the wire 31 inside the wiring harness 3 .

[0047] Working principle: When in use, hold the paint film sensor 4 and drag the wire harness 3 out of the paint film thickness gauge housing 1. The depth of the narrow position can be detected as needed to determine the use length of the wire harness 3, which is more applicable.

[0048] After the use length of the wiring harness 3 is determined, the external switch of the micro air pump 61 is started, and the micro air pump 61 inflates the hose 62 to straighten the hose 62, thereby straightening the wire 31 and the wiring harness 3, so that the paint film sensor 4 is no longer in a drooping state, and the paint film thickness is detected by extending the paint film sensor 4 to the inside of a narrow space.

[0049] Specific implementation method three: This implementation method is a further limitation of specific implementation method two. The axial cross-section of the mounting plate 23 and the retaining spring 24 is a concentric circle structure, and the mounting plate 23 and the locking gear 28 are a concentric circle structure. At the same time, the mounting plate 23 is a circular structure made of plastic material.

[0050] like Figure 3 As shown: the wire harness 3 is arranged in an annular shape on the outer side of the clamp spring 24, and the end of the wire harness 3 is arranged on the clamp spring 24. When the wire harness 3 is pulled, the annular clamp spring 24 is compressed;

[0051] When the setting of the wiring harness 3 is released, the force acts on the retaining spring 24, and the retaining spring 24 resets and rebounds, causing the wiring harness 3 to contract. The paint film sensor 4 is fixed to the bottom of the paint film thickness gauge housing 1, and the paint film sensor 4 and the wiring harness 3 are stored synchronously.

[0052] Specific implementation method four: This implementation method is a further limitation of specific implementation method two. A notch is opened on the right side of the paint film thickness gauge housing 1, and the release seat 21 is arranged inside the notch. At the same time, the end of the release seat 21 is fixed to the transmission column 22, and the end of the transmission column 22 away from the release seat 21 is inserted into the limiting hole opened inside the limiting seat 26, and the bottom of the limiting seat 26 is screwed inside the paint film thickness gauge housing 1.

[0053] like Figure 3-4 As shown: by pressing the release seat 21, the locking or releasing work of the clamping spring 24 can be achieved;

[0054] The specific method is: press the release seat 21, and under the drive of the two sets of transmission columns 22, the locking rack 27 and the locking gear 28 are disengaged, and at this time, the paint film sensor 4 is pulled to pull the wiring harness 3;

[0055] like Figure 3-4 As shown: after the length of the wire harness 3 is determined, the release seat 21 is loosened, so that the locking rack 27 and the locking gear 28 are engaged, the retaining spring 24 is locked, and the use length of the wire harness 3 is fixed.

[0056] Specific implementation mode five: This implementation mode is a further limitation of specific implementation mode four. The transmission column 22 is provided in two groups, and locking racks 27 are fixedly installed on the left sides of the surfaces of the two groups of transmission columns 22. Meanwhile, a locking gear 28 is provided between the two groups of transmission columns 22.

[0057] like Figure 2-4 As shown, the distance between the two sets of transmission columns 22 is greater than the diameter of the locking gear 28 , so that when the locking gear 28 rotates, there will be no motion interference between the two sets of transmission columns 22 .

[0058] Specific implementation method six: This implementation method is a further limitation of specific implementation method five. Reset springs 29 are installed on both sets of transmission columns 22, and the sizes of the locking racks 27 and the locking gears 28 on the two sets of transmission columns 22 are adapted to each other, and the locking racks 27 and the locking gears 28 are meshed and connected.

[0059] like Figure 3-4 As shown: reset springs 29 are installed on both sets of transmission columns 22. When the release seat 21 is pressed, the locking rack 27 and the locking gear 28 are disengaged, and the reset spring 29 is in a compressed state;

[0060] When the pressure on the release seat 21 disappears, the return spring 29 rebounds to cause the locking rack 27 to mesh with the locking gear 28, and the release seat 21 returns to its initial state.

[0061] Specific embodiment seven: This embodiment is a further limitation of specific embodiment two. A cleaning seat 5 is installed at the bottom of the paint film thickness gauge housing 1. The cleaning seat 5 is composed of a fixing cylinder 51, a positioning seat 52, a positioning groove 53, a fixing bolt 54, a fixing seat 55, a brush 56 and a positioning plate 57. At the same time, the fixing cylinder 51 is screwed to the bottom of the paint film thickness gauge housing 1.

[0062] like Figure 5-7 As shown: the setting of the cleaning seat 5 can clean the wire harness 3 when it is retracted, and can remove dust and dirt on the outside of the wire harness 3 to ensure the cleanliness of the outside of the wire harness 3.

[0063] Specific implementation eight: This implementation is a further limitation of specific implementation seven. The fixed tube 51 is made of plastic material and has a circular cross-section. Two groups of fixed tubes 51 are evenly installed on the inner wall of the fixed tube 51. At the same time, a positioning groove 53 is opened inside the fixed tube 51.

[0064] like Figure 5-7 As shown, the fixed cylinder 51 is detachable at the bottom of the paint film thickness gauge housing 1, so that after the fixed cylinder 51 is disassembled, the brush 56 is taken out and cleaned, thereby realizing the reuse of the brush 56.

[0065] Specific embodiment nine: This embodiment is a further limitation of specific embodiment eight, wherein a fixing seat 55 is installed inside the fixing cylinder 51, and a brush 56 is fixedly installed on the inner wall of the fixing seat 55, the brush 56 is cylindrical, and a cleaning hole smaller than the size of the wiring harness 3 is opened in the middle of the brush 56, two groups of positioning plates 57 are evenly installed on the outer side of the fixing seat 55, and the two groups of positioning plates 57 are respectively inserted into the inside of the two groups of positioning grooves 53 and are mechanically screwed and fixed by hexagon socket bolts.

[0066] like Figure 5-7 As shown, the brush 56 can be disassembled by removing the fixing bolt 54 and pulling out the positioning plate 57 from the inside of the positioning groove 53 ; the fixing seat 55 can also be positioned and installed inside the fixing tube 51 through the positioning plate 57 and the positioning groove 53 .

[0067] like Figure 1 As shown: a dust cover 42 is installed on the outside of the paint film sensor 4, and the paint film sensor 4 is covered and sealed by the dust cover 42, so as to prevent dust from adhering to the outside of the paint film sensor 4, ensure the cleanliness of the paint film sensor 4 when working, and prevent dust from being stained on the paint film sensor 4, causing errors when the paint film sensor 4 is working;

[0068] The paint film sensor 4 and the dust cover 42 are sealed by two sets of first sealing strips 43 and second sealing strips 44 made of rubber materials, which can prevent dust from being contaminated on the paint film sensor 4.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry paint film thickness measuring device for steel structure installation and construction, comprising a paint film thickness gauge housing (1), a storage component (2) and a pressurizing component (6), a display screen is installed on the outside of the paint film thickness gauge housing (1), and operation buttons are located below the display screen on the surface of the paint film thickness gauge housing (1), and a paint film sensor (4) is installed at the bottom of the paint film thickness gauge housing (1) through a wiring harness (3), characterized in that: The storage assembly (2) is installed inside the paint film thickness gauge housing (1), and the storage assembly (2) is composed of a release seat (21), a transmission column (22), a mounting plate (23), a retaining spring (24), a mounting column (25), a limit seat (26), a locking rack (27) and a locking gear (28), and the mounting column (25) is movably arranged inside the paint film thickness gauge housing (1), and the mounting plate (23) is fixedly arranged on the mounting column (25), the locking gear (28) is installed on the outer bottom of the mounting column (25), and the retaining spring (24) is arranged on the outer upper part of the mounting column (25), and one end of the retaining spring (24) is fixedly connected to the mounting column (25), and the other end of the retaining spring (24) is fixedly connected to the wiring harness (3), and a wire (31) is inserted into the wiring harness (3), and one end of the wire (31) is electrically connected to the paint film sensor (4), and the other end of the wire (31) is electrically connected to the detection element inside the paint film thickness gauge; The outer side of the paint film sensor (4) comprises a dust cover (42), and a stress strip (41) arranged in an annular manner is fixedly arranged on the top of the dust cover (42), and a first sealing strip (43) and a second sealing strip (44) arranged in an annular manner are fixedly arranged inside the dust cover (42), and mounting holes (46) are provided at the bottom of the cleaning seat (5) and the outer side of the dust cover (42), and the two groups of mounting holes (46) are connected by a connecting rope (45), and the paint film sensor (4) and the dust cover (42) are sealed by two groups of first sealing strips (43) and second sealing strips (44) made of rubber material; The pressurizing component (6) is composed of two parts, namely a micro air pump (61) and a hose (62), and the micro air pump (61) is screwed into the interior of the paint film thickness gauge housing (1), while the inflation end of the micro air pump (61) is connected to the hose (62), and the hose (62) is installed together with the wire (31) inside the wiring harness (3); The axial cross-sections of the mounting plate (23) and the retaining spring (24) are concentric circle structures, and the mounting plate (23) and the locking gear (28) are concentric circle structures, and the mounting plate (23) is a circular structure made of plastic material; The right side of the paint film thickness gauge housing (1) is provided with a notch, and the release seat (21) is arranged inside the notch, and the end of the release seat (21) is fixed to the transmission column (22), and the end of the transmission column (22) away from the release seat (21) is inserted into a limiting hole provided inside the limiting seat (26), and the bottom of the limiting seat (26) is screwed inside the paint film thickness gauge housing (1); The transmission columns (22) are arranged in two groups, and locking racks (27) are fixedly installed on the left sides of the surfaces of the two groups of transmission columns (22), and the locking gears (28) are arranged between the two groups of transmission columns (22); The two sets of transmission columns (22) are both equipped with return springs (29), and the sizes of the locking racks (27) and the locking gears (28) on the two sets of transmission columns (22) are matched, and the locking racks (27) and the locking gears (28) are meshed and connected.

2. A dry paint film thickness measuring device for steel structure installation and construction according to claim 1, characterized in that: A cleaning seat (5) is installed at the bottom of the paint film thickness gauge housing (1), and the cleaning seat (5) is composed of a fixing cylinder (51), a positioning seat (52), a positioning groove (53), a fixing bolt (54), a fixing seat (55), a brush (56) and a positioning plate (57), and the fixing cylinder (51) is screwed to the bottom of the paint film thickness gauge housing (1).

3. A dry paint film thickness measuring device for steel structure installation and construction according to claim 2, characterized in that: The fixing tube (51) is made of plastic material and has a circular cross-section. Two groups of fixing tubes (51) are evenly mounted on the inner wall of the fixing tube (51), and a positioning groove (53) is provided inside the fixing tube (51).

4. A dry paint film thickness measuring device for steel structure installation and construction according to claim 3, characterized in that: A fixing seat (55) is installed inside the fixing cylinder (51), and a brush (56) is fixedly installed on the inner wall of the fixing seat (55). The brush (56) is cylindrical, and a cleaning hole smaller than the size of the wire harness (3) is opened in the middle of the brush (56). Two groups of positioning plates (57) are evenly installed outside the fixing seat (55), and the two groups of positioning plates (57) are respectively inserted into the inside of the two groups of positioning grooves (53) and are mechanically screwed and fixed by hexagon socket bolts.

5. A method for measuring the thickness of a dry paint film for steel structure installation and construction using the dry paint film thickness measuring device for steel structure installation and construction as claimed in claim 1, wherein the method of using the method comprises the following steps: detecting equipment, pressing a release seat (21), pulling a paint film sensor (4), starting a micro air pump (61) and measuring the thickness of the paint film sensor (4), wherein: Step A. Test the device: Turn on the device and observe whether the device can start up and operate normally; Step B. Pressing the release seat (21): Pressing the release seat (21), driven by the two sets of transmission columns (22), causes the locking rack (27) and the locking gear (28) to disengage, and at this time, pulling the paint film sensor (4) can pull the wiring harness (3); Step C. visually inspecting the use length of the wire harness (3): visually inspecting the depth of the narrow area to determine the use length of the wire harness (3); after the use length of the wire harness (3) is determined, releasing the release seat (21) to lock the length of the wire harness (3); Step D. starting the micro air pump (61): the micro air pump (61) inflates the hose (62) so that the hose (62) is straightened, and the wire (31) and the wiring harness (3) are straightened so that the paint film sensor (4) is no longer in a hanging state; Step E. The paint film sensor (4) performs thickness measurement: by extending the paint film sensor (4) to the inside of the narrow area, the thickness of the paint surface on the outside of the steel structure inside the narrow area is measured.

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