Device for detecting thickness of galvanized coating on surface of hot-dip galvanized part

Abstract

The invention discloses a device for detecting the thickness of a galvanized coating on the surface of a hot galvanized part, and relates to the technical field of galvanized coating detection. A device for detecting the thickness of a galvanized coating on the surface of a hot-dip galvanized part comprises a base mechanism, the base mechanism comprises a base, and a bearing assembly used for placing a workpiece is arranged in the middle of the upper surface of the base; a laser mechanism is arranged above the bearing assembly; a shading assembly is arranged between the laser mechanism and the base, and the shading assembly is composed of two sets of symmetrical shading mechanisms; each group of shading mechanism comprises a first shading petal assembly, three layers of second shading petal assemblies are sequentially arranged on the inner side of each first shading petal assembly, and a power assembly is arranged below each layer of second shading petal assembly; the first shading petal assembly comprises a first shading petal fixedly connected with the base, and a first induction piece is fixedly connected to the upper end of the first shading petal in an embedded mode. A device for detecting the thickness of a galvanized coating on the surface of a hot-dip galvanized part improves the light shielding efficiency and further improves the detection accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of galvanized coating detection, in particular to a device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part. Background Art

[0002] Galvanizing refers to a surface treatment technique that coats metals, alloys, or other materials with a layer of zinc for aesthetic purposes and rust prevention. Hot-dip galvanizing is the primary method used. Zinc is readily soluble in both acid and alkali, hence its name, an amphoteric metal. Zinc hardly changes in dry air. In humid air, a dense film of basic zinc carbonate forms on the zinc surface. Zinc exhibits poor corrosion resistance in atmospheres containing sulfur dioxide, hydrogen sulfide, and marine environments. The zinc coating is particularly susceptible to corrosion in high-temperature, high-humidity, and organic acidic atmospheres. For steel substrates, zinc coating is an anodic coating, primarily used to prevent corrosion. Its protective properties are highly dependent on coating thickness. Passivation, dyeing, or coating with a light-protecting agent can significantly enhance the protective and decorative properties of the zinc coating.

[0003] Hot-dip galvanizing significantly improves the corrosion resistance of workpieces by depositing a zinc coating on the surface of a metal substrate. It is widely used in the steel, automotive, and aviation industries. Coating thickness, a core quality indicator, directly impacts product lifespan, making high-precision measurement crucial. Laser thickness measurement technology, due to its non-contact, fast response, and adaptability to complex curved surfaces, has become the preferred solution for automated production lines.

[0004] The patent with announcement number CN215447775U discloses a multifunctional galvanized coating production line detection equipment, including a device main body, a side panel is installed on one side of the device main body, a slide groove is provided on one side of the side panel, a motor is installed at one end inside the slide groove, a reducer is fixedly installed on one side of the motor, a connecting shaft is installed on one side of the reducer, a threaded rod is fixedly installed on one end of the connecting shaft, a first slider is threadedly installed on the threaded rod, a first L-shaped plate is fixedly installed on one side of the first slider, a first electric telescopic rod is fixedly installed on one side of the first L-shaped plate, a second slider is fixedly installed on one end of the first electric telescopic rod, a second L-shaped plate is also fixedly installed on one side of the first slider, a second electric telescopic rod is fixedly installed on one side of the second L-shaped plate, and a third slider is fixedly installed on one end of the second electric telescopic rod. The motor drives the reducer to rotate, the reducer drives the connecting shaft to rotate, the connecting shaft drives the threaded rod to rotate, and the rotation of the threaded rod enables the first slider to slide in the slide groove, thereby enabling the first laser thickness gauge and the second laser thickness gauge to move left and right. The positions of the second slider and the third slider can be adjusted through the telescopic effect of the first electric telescopic rod and the second electric telescopic rod, thereby enabling the positions of the first laser thickness gauge and the second laser thickness gauge to be adjusted forward and backward, thereby enabling the first laser thickness gauge and the second laser thickness gauge to comprehensively detect the thickness of the galvanized coating on the product.

[0005] In the above technical solution, the workpiece is directly exposed to the outside world. However, hot-dip galvanizing workshops generally use high-brightness lighting, and the zinc layer on the workpiece surface has high reflectivity. Ambient light easily overlaps with the laser signal, causing errors in the identification of reflection peaks. Diffuse reflected light increases the deviation in the calculated optical path and results in an insufficient signal-to-noise ratio. When the ambient light intensity exceeds the laser signal by several times, the missed detection rate increases significantly. Therefore, a device for measuring the thickness of the zinc coating on hot-dip galvanized parts is urgently needed to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part, so as to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part, comprising a base mechanism, wherein the base mechanism comprises a base, a bearing assembly for placing a workpiece is provided in the middle of the upper surface of the base; a laser mechanism is provided above the bearing assembly;

[0008] A light shielding assembly is provided between the laser mechanism and the base, and the light shielding assembly is composed of two groups of symmetrical light shielding mechanisms;

[0009] Each group of the shading mechanism includes a first shading petal assembly, three layers of second shading petal assemblies are sequentially arranged on the inner side of the first shading petal assembly, and a power assembly is arranged under each layer of the second shading petal assembly;

[0010] The first light-shielding petal assembly includes a first light-shielding petal fixedly connected to the base, and a first sensing piece is fixedly embedded on the upper end of the first light-shielding petal;

[0011] The second light-shielding petal assembly includes a hollow second light-shielding petal, and the upper end of the second light-shielding petal is fixedly embedded with a second sensing piece;

[0012] The laser mechanism includes a laser cylinder adapted to fit the first sensing piece and the second sensing piece, and an induction ring is fixedly embedded on the outer side of the middle portion of the laser cylinder and is inductively coupled to the first sensing piece and the second sensing piece.

[0013] A laser component is arranged in the laser cylinder.

[0014] As a preferred technical solution of the present invention, the bearing assembly includes a chassis fixedly connected to a base, and a bearing plate is movably connected to the upper side of the chassis via a universal shaft.

[0015] As a preferred technical solution of the present invention, the outer side of the bearing assembly is sequentially provided with a first slide rail, a second slide rail and a third slide rail opened on the base, the first slide rail, the second slide rail and the third slide rail are symmetrically connected, and the first slide rail is annular;

[0016] One side of the upper surface of the base is fixedly connected with a side wall.

[0017] The second light-shielding petal is filled with an inert gas, an inner lower side of the second light-shielding petal is fixedly connected to an air pump, and an upper end of the air pump is fixedly connected to an air pipe;

[0018] The power assembly of the inner layer is slidably plugged into the first slide rail, the power assembly of the middle layer is slidably plugged into the second slide rail, and the power assembly of the outer layer is slidably plugged into the third slide rail;

[0019] The power assembly includes a rail block fixedly connected to the second light-shielding petal, one end of the lower surface of the rail block is fixedly connected to a cylinder connected to an air pump, the output end of the cylinder is fixedly connected to an air bag located below the rail block, and the interior of the air bag is fixedly connected to a spring;

[0020] A pressure sensor is fixedly embedded on the side of the cylinder facing away from the airbag.

[0021] As a preferred technical solution of the present invention, a magnetic sheet is fixedly embedded on the side of the second shading petal of the second shading petal assembly in the inner layer.

[0022] As a preferred technical solution of the present invention, an electric telescopic rod is fixedly connected to the top of the laser tube, and a column is fixedly connected between the fixed end of the electric telescopic rod and the side wall;

[0023] Inner rails are respectively provided on both sides of the inner wall of the laser cylinder.

[0024] The laser assembly includes a motor, and both sides of the fixed end of the motor are fixedly connected to machine rods adapted to be plugged into the inner rail;

[0025] The output end of the motor is fixedly connected to a turntable adapted to be plugged into the laser tube, the middle portion of the lower surface of the turntable is fixedly connected to a fixed rail, and the laser is slidably plugged into the fixed rail;

[0026] Extension rails are respectively connected to both sides of the fixed rail. One end of the extension rail close to the fixed rail is hinged with a connecting arm through an electric shaft. The connecting arm is fixedly connected to the turntable.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) A device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part reduces the illumination in the shading component under working ambient light, improves the signal-to-noise ratio of the laser signal, effectively eliminates the interference of diffuse reflected light on ranging, reduces the interference of ambient light, improves the light shielding efficiency, and thus improves the detection accuracy.

[0029] (2) A device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part. When the device is in the retracted state, the light shielding component is completely retracted to the side of the laser mechanism, which reduces the occupied space, does not affect the gripping of the workpiece by the robot arm, and does not affect the smoothness of the operation process, thereby improving production efficiency.

[0030] (3) A device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part. When the first light-shielding flap assembly and the second light-shielding flap assembly sense that the laser tube has reached a working position, the power assembly is powered on to start the power assembly, so that the light-shielding assembly automatically closes, thereby improving the linkage and the detection efficiency.

[0031] (4) A device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part. During non-working hours, the extension rail is rotated to a state perpendicular to the fixed rail by a power shaft, and the laser assembly slides up along the inner rail into the laser tube through a machine rod. The laser is protected in the extension rail and the laser tube to avoid daily bumps and increase its service life.

[0032] (5) A device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part. The laser can slide along the fixed rail and the extension rail, and the turntable is driven by a motor to rotate, which can drive the extension rail and the laser to rotate together to adjust the detection position, thereby increasing the detectable area of ​​the laser and improving the comprehensiveness of the laser detection.

[0033] (6) A device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part, wherein a pressure sensor is provided at the end of the cylinder away from the airbag. When the light shielding assembly is closed, the pressure sensor contacts the inner wall of the end of the first slide rail, the second slide rail and the third slide rail, thereby feeding back the closing pressure of the light shielding mechanism, ensuring that the light shielding assembly is opened and closed in place, improving the light-shielding performance of the light shielding assembly, and further improving the detection accuracy of the thickness of the galvanized coating.

[0034] (7) A device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part, wherein the airbag is expanded by inflating the cylinder to drive the rail block to drive the second light-shielding flap assembly to slide, and the three-layer power assembly is respectively inserted into the first slide rail, the second slide rail and the third slide rail to ensure the movement accuracy of the second light-shielding flap assembly and improve the closing smoothness of the light-shielding assembly.

[0035] (8) A device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part. When the shading component is finally closed, the magnetic sheets will attract each other to speed up the closing speed of the second shading petal component of the inner layer, while reducing the light leakage rate and improving the shading performance of the shading component. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of a closed structured shading assembly of the present invention;

[0037] Figure 2 A schematic diagram of opening the structured shading assembly of the present invention;

[0038] Figure 3 This is a schematic diagram of the base mechanism of the present invention;

[0039] Figure 4 This is a schematic top view of the base of the present invention;

[0040] Figure 5 This is a schematic diagram of the load-bearing assembly of the present invention;

[0041] Figure 6 Schematic diagram of the shading mechanism of the present invention;

[0042] Figure 7 Schematic diagram of the second light-shielding flap assembly of the present invention;

[0043] Figure 8 For the present invention Figure 7 An enlarged schematic diagram of point B;

[0044] Figure 9 For the present invention Figure 6 A magnified schematic diagram of point A;

[0045] Figure 10 This is a schematic diagram of the connection of the shading mechanism of the present invention;

[0046] Figure 11 Schematic diagram of the laser mechanism of the present invention;

[0047] Figure 12 This is a schematic diagram of the interior of the laser mechanism of the present invention;

[0048] Figure 13 A bottom view schematic diagram of the laser assembly of the present invention;

[0049] Figure 14 This is a schematic diagram of the working state of the laser mechanism of the present invention.

[0050] In the figure: 1. base mechanism; 101. base; 102. chassis; 103. carrier plate; 104. first slide rail; 105. second slide rail; 106. third slide rail; 107. side wall; 2. shading mechanism; 201. first shading flap; 202. first induction plate; 203. second shading flap; 204. second induction plate; 205. air pump; 206. air pipe; 207. rail block; 208. air cylinder; 209. air bag; 210. spring; 211. pressure sensor; 212. magnetic sheet; 3. laser mechanism; 301. electric telescopic rod; 302. column; 303. laser tube; 304. induction ring; 305. inner rail; 306. motor; 307. machine rod; 308. turntable; 309. fixed rail; 310. laser; 311. extension rail; 312. connecting arm. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0052] Example: See Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 14 A device for detecting the thickness of a galvanized coating on a hot-dip galvanized part includes a base mechanism 1, wherein the base mechanism 1 includes a base 101, and a bearing assembly for placing a workpiece is provided in the middle of the upper surface of the base 101; a laser mechanism 3 is provided above the bearing assembly;

[0053] A light shielding assembly is provided between the laser mechanism 3 and the base 101, and the light shielding assembly is composed of two sets of symmetrical light shielding mechanisms 2;

[0054] Each set of shading mechanisms 2 includes a first shading petal assembly, and three layers of second shading petal assemblies are sequentially arranged on the inner side of the first shading petal assembly. A power assembly is arranged below each layer of the second shading petal assembly, and the power assembly can sequentially expand the second shading petal assemblies to enclose the outside of the workpiece to achieve a shading effect;

[0055] The first shading flap assembly includes a first shading flap 201 fixedly connected to the base 101, and a first sensing piece 202 fixedly embedded on the upper end of the first shading flap 201;

[0056] The second light shielding flap assembly includes a hollow second light shielding flap 203, and a second sensing piece 204 is fixedly embedded at the upper end of the second light shielding flap 203;

[0057] The laser mechanism 3 includes a laser tube 303 adapted to fit the first sensing piece 202 and the second sensing piece 204. An induction ring 304 is fixedly embedded on the outer side of the middle portion of the laser tube 303 for mutual induction with the first sensing piece 202 and the second sensing piece 204.

[0058] A laser assembly is disposed in the laser tube 303 .

[0059] See also Figure 5 The bearing assembly includes a chassis 102 fixedly connected to the base 101, and a bearing plate 103 is movably connected to the top of the chassis 102 through a universal joint.

[0060] See also Figure 4 、 Figure 7 、 Figure 8 The outer side of the bearing assembly is sequentially provided with a first slide rail 104, a second slide rail 105 and a third slide rail 106 which are opened on the base 101. The first slide rail 104, the second slide rail 105 and the third slide rail 106 are connected in a positive position. The first slide rail 104 is annular, and its circumference gradually decreases from the first slide rail 104 to the third slide rail 106.

[0061] A side wall 107 is fixedly connected to one side of the upper surface of the base 101 .

[0062] The second light shielding flap 203 is filled with an inert gas. The lower side of the second light shielding flap 203 is fixedly connected to an air pump 205. The upper end of the air pump 205 is fixedly connected to an air pipe 206.

[0063] The inner power assembly is slidably connected to the first slide rail 104, the middle power assembly is slidably connected to the second slide rail 105, and the outer power assembly is slidably connected to the third slide rail 106;

[0064] The power assembly includes a track block 207 fixedly connected to the second light shielding flap 203. One end of the lower surface of the track block 207 is fixedly connected to a cylinder 208 connected to the air pump 205. The output end of the cylinder 208 is fixedly connected to an air bag 209 located below the track block 207. The interior of the air bag 209 is fixedly connected to a spring 210.

[0065] A pressure sensor 211 is fixedly connected to the side of the cylinder 208 facing away from the airbag 209 .

[0066] See also Figure 9 A magnetic sheet 212 is fixedly embedded on the side of the second shading flap 203 of the inner second shading flap assembly.

[0067] See also Figure 11 、 Figure 12 、 Figure 13 , an electric telescopic rod 301 is fixedly connected to the top of the laser tube 303, and a column 302 is fixedly connected between the fixed end of the electric telescopic rod 301 and the side wall 107;

[0068] Inner rails 305 are respectively formed on both sides of the inner wall of the laser tube 303 .

[0069] The laser assembly includes a motor 306, and the two sides of the fixed end of the motor 306 are fixedly connected to the machine rod 307 adapted to be inserted into the inner rail 305;

[0070] The output end of the motor 306 is fixedly connected to a turntable 308 adapted to be plugged into the laser tube 303. A fixed rail 309 is fixedly connected to the middle of the lower surface of the turntable 308. A laser 310 is slidably plugged into the fixed rail 309.

[0071] Extension rails 311 are respectively connected to both sides of the fixed rail 309 . One end of the extension rail 311 close to the fixed rail 309 is hinged with a connecting arm 312 through an electric shaft. The connecting arm 312 is fixedly connected to the turntable 308 .

[0072] The working principle of the present invention is as follows:

[0073] When the laser 310 is used to emit a laser to the workpiece to detect the coating thickness thereof, the inert gas filled in the second shading flap 203 is filled into the cylinder 208 through the air pump 205, thereby inflating the airbag 209, thereby driving the second shading flap assembly to slide in sequence along the first slide rail 104, the second slide rail 105 and the third slide rail 106, so that the two groups of shading mechanisms 2 form a shading enclosure on the outside of the workpiece. Under the working environment light, the illumination inside the shading assembly is reduced, the signal-to-noise ratio of the laser signal is improved, the interference of diffuse reflected light on the ranging is effectively eliminated, the interference of ambient light is reduced, the light shielding efficiency is improved, and the detection accuracy is thereby improved.

[0074] During non-working hours, the electric telescopic rod 301 retracts, and the non-sensing ring 304 of the laser tube 303 contacts the first sensing piece 202 of the first shading petal assembly and the second sensing piece 204 of the second shading petal assembly. At this time, the shading assembly is retracted. In the retracted state, the shading assembly is completely retracted to the side of the laser mechanism 3, reducing the occupied space, without affecting the robot arm's grasping of the workpiece, and without affecting the smoothness of the operation process, thereby improving production efficiency.

[0075] An induction ring 304 is fixedly embedded on the outer middle part of the laser tube 303, which is inductively coupled to the first induction plate 202 and the second induction plate 204. When the laser 310 is ready to work, the electric telescopic rod 301 extends to move the laser tube 303 downward. At this time, the induction ring 304 of the laser tube 303 contacts the first induction plate 202 of the first shading petal assembly and the second induction plate 204 of the second shading petal assembly. After the first and second shading petal assemblies sense that the laser tube 303 has reached the working position, they energize and start the power assembly, causing the shading assembly to automatically close, thereby improving linkage and improving detection efficiency.

[0076] During non-working hours, the extension rail 311 is rotated to a state perpendicular to the fixed rail 309 through the power shaft, and the laser assembly slides up along the inner rail 305 into the laser tube 303 through the machine rod 307. The laser 310 is protected in the extension rail 311 and the laser tube 303 to avoid daily bumps and increase its service life.

[0077] Extension rails 311 are respectively connected to both sides of the fixed rail 309. The end of the extension rail 311 close to the fixed rail 309 is hinged with a connecting arm 312 through an electric shaft. The connecting arm 312 is fixedly connected to the turntable 308. When the laser 310 is working, the electric shaft rotates the extension rails 311 on both sides to a state flush with the fixed rail 309, and connects with the fixed rail 309 with the laser 310 installed in the middle. The laser 310 can slide along the fixed rail 309 and the extension rail 311, and the turntable 308 is driven to rotate by the motor 306, which can drive the extension rail 311 and the laser 310 to rotate together to adjust the detection position, so that the detectable area of ​​the laser 310 is increased, thereby improving the comprehensiveness of laser detection.

[0078] A pressure sensor 211 is provided at the end of the cylinder 208 facing away from the airbag 209. When the shading assembly is closed, the pressure sensor 211 contacts the inner walls of the ends of the first slide rail 104, the second slide rail 105 and the third slide rail 106, thereby feeding back the closing pressure of the shading mechanism 2, ensuring that the shading assembly is opened and closed in place, improving the light-shielding performance of the shading assembly, and further improving the accuracy of the galvanized coating thickness detection.

[0079] The outer side of the supporting assembly is sequentially provided with a first slide rail 104, a second slide rail 105 and a third slide rail 106 which are opened on the base 101. The first slide rail 104, the second slide rail 105 and the third slide rail 106 are connected in the correct position. The three-layer second shading flap assembly is respectively inserted into the first slide rail 104, the second slide rail 105 and the third slide rail 106 through the power assembly. The air bag 209 is expanded by inflating the cylinder 208 to drive the rail block 207 to drive the second shading flap assembly to slide. The three-layer power assembly is respectively inserted into the first slide rail 104, the second slide rail 105 and the third slide rail 106 to ensure the movement accuracy of the second shading flap assembly and improve the closing smoothness of the shading assembly.

[0080] The inner second shading flap assembly finally contacts to close the shading assembly. The side of the second shading flap 203 of the inner second shading flap assembly is fixedly embedded with a magnetic sheet 212. Therefore, when the shading assembly is finally closed, the magnetic sheets 212 will attract each other to speed up the closing speed of the inner second shading flap assembly, while reducing the light leakage rate and improving the shading performance of the shading assembly.

[0081] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the thickness of a galvanized coating on a hot-dip galvanized part, comprising a base mechanism (1), wherein the base mechanism (1) comprises a base (101), a bearing assembly for placing a workpiece is provided in the middle of the upper surface of the base (101); a laser mechanism (3) is provided above the bearing assembly; Its characteristics are: A light shielding assembly is provided between the laser mechanism (3) and the base (101), and the light shielding assembly is composed of two groups of symmetrical light shielding mechanisms (2); Each group of the shading mechanism (2) comprises a first shading petal assembly, three layers of second shading petal assemblies are sequentially arranged on the inner side of the first shading petal assembly, and a power assembly is arranged below each layer of the second shading petal assembly; The first light-shielding flap assembly comprises a first light-shielding flap (201) fixedly connected to the base (101), and a first sensing sheet (202) is fixedly embedded at the upper end of the first light-shielding flap (201); The second light-shielding flap assembly comprises a hollow second light-shielding flap (203), and a second sensing piece (204) is fixedly embedded at the upper end of the second light-shielding flap (203); The laser mechanism (3) comprises a laser tube (303) adapted to fit the first sensing plate (202) and the second sensing plate (204); an induction ring (304) for mutual induction with the first sensing plate (202) and the second sensing plate (204) is fixedly embedded on the outer side of the middle portion of the laser tube (303); A laser component is arranged in the laser cylinder (303).

2. The device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part according to claim 1, characterized in that: The bearing assembly comprises a chassis (102) fixedly connected to a base (101), and a bearing plate (103) is movably connected above the chassis (102) via a universal shaft.

3. The device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part according to claim 1, characterized in that: The outer side of the bearing assembly is provided with a first slide rail (104), a second slide rail (105) and a third slide rail (106) which are opened on the base (101) in sequence, the first slide rail (104), the second slide rail (105) and the third slide rail (106) are sleeved in the right position, and the first slide rail (104) is annular; One side of the upper surface of the base (101) is fixedly connected to a side wall (107).

4. The device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part according to claim 3, characterized in that: The second light-shielding flap (203) is filled with an inert gas, an air pump (205) is fixedly connected to the lower side of the interior of the second light-shielding flap (203), and an air pipe (206) is fixedly connected to the upper end of the air pump (205); The power assembly of the inner layer is slidably connected to the first slide rail (104), the power assembly of the middle layer is slidably connected to the second slide rail (105), and the power assembly of the outer layer is slidably connected to the third slide rail (106); The power assembly includes a rail block (207) fixedly connected to the second light shielding flap (203); one end of the lower surface of the rail block (207) is fixedly connected to a cylinder (208) connected to an air pump (205); the output end of the cylinder (208) is fixedly connected to an air bag (209) located below the rail block (207); and the interior of the air bag (209) is fixedly connected to a spring (210); A pressure sensor (211) is fixedly embedded on one side of the cylinder (208) facing away from the air bag (209).

5. The device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part according to claim 1, characterized in that: A magnetic sheet (212) is fixedly embedded on the side of the second light-shielding flap (203) of the second light-shielding flap assembly in the inner layer.

6. The device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part according to claim 3, characterized in that: An electric telescopic rod (301) is fixedly connected above the laser tube (303), and a column (302) is fixedly connected between the fixed end of the electric telescopic rod (301) and the side wall (107); Inner rails (305) are respectively provided on both sides of the inner wall of the laser cylinder (303).

7. The device for detecting the thickness of the galvanized coating on the surface of a hot-dip galvanized part according to claim 6, characterized in that: The laser assembly includes a motor (306), and both sides of the fixed end of the motor (306) are fixedly connected with machine rods (307) adapted to be plugged into the inner rail (305); The output end of the motor (306) is fixedly connected to a turntable (308) adapted to be plugged into the laser tube (303); a fixed rail (309) is fixedly connected to the middle portion of the lower surface of the turntable (308); and a laser (310) is slidably plugged into the fixed rail (309); Extension rails (311) are respectively connected to both sides of the fixed rail (309); one end of the extension rail (311) close to the fixed rail (309) is hinged to a connecting arm (312) through an electric shaft; and the connecting arm (312) is fixedly connected to the turntable (308).

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