A device for detecting corrosion defects of a body fixing member and a method for detecting the same

Abstract

This invention relates to a device and method for detecting corrosion defects in machine body fasteners, belonging to the field of non-destructive testing technology. The detection device includes an outer shell, within which two adjusting components are installed. A contact component is mounted on each adjusting component, and a detection component is located on the inner end of the contact component. This invention features a simple overall structure, small size, and portability. It is easy to operate for detecting corrosion in fasteners, saving time and effort, and the detection results are intuitive and visual. The detection method includes the following steps: S1, placement; S2, a cylinder drives the contact component against the machine body sheet metal until a gap appears; S3, a copper sheet extends into the gap; S4, the top-view condition is determined by whether the detection light is on or off.

Description

Technical Field

[0001] This invention relates to a device and method for detecting corrosion defects in machine body fasteners, belonging to the field of non-destructive testing technology. Background Technology

[0002] The airframe refers to all parts of an aircraft except for the power plant. It includes the fuselage, wings, landing gear, tail, and other components. Aircraft manufacturers are primarily responsible for manufacturing the airframe and performing the final assembly of the aircraft. Therefore, during assembly, various fasteners, including screws and bolts, are used for connection.

[0003] The aforementioned fasteners are prone to corrosion, especially in aircraft operating in harsh environments. For example, the airframe structure of naval aircraft is affected by the high-salt and high-humidity marine environment, resulting in varying degrees of corrosion in steel bolts and rivets. Most steel bolt and rivet corrosion is caused by the contact of dissimilar metals in a humid environment. Since the steel bolt and rivet are made of different materials, moisture can enter the gaps between the bolt and the airframe, leading to corrosion around the holes. This corrosion reduces the strength of the bolt and rivet, making it prone to loosening, deformation, or even breakage under aerodynamic forces during flight. This can cause skin deformation or deterioration of structural load-bearing capacity, creating flight safety hazards. Because this type of corrosion exists in the gaps between the steel bolt and the airframe material, it is difficult to detect with the naked eye and requires non-destructive testing techniques. Current technologies rely on visual inspection, sometimes requiring disassembly for observation, which is inconvenient, time-consuming, and labor-intensive. Therefore, it is necessary to develop appropriate testing devices to detect the corrosion of fasteners. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem of the inconvenience of detecting corrosion of fasteners in the prior art, and to provide a device and method for detecting corrosion defects in body fasteners.

[0005] This invention is achieved through the following technical solution:

[0006] A device for detecting corrosion defects in body fasteners includes an outer shell, two adjustment components are provided inside the outer shell, a contact component is installed on the adjustment component, and a detection component is provided on the inner end of the contact component.

[0007] The adjustment assembly includes a fixing block fixed to the inner wall of the outer casing 1, and a support is telescopically connected inside the fixing block;

[0008] The abutment component includes a support frame that is slidably connected to the adjustment component. Several abutment rods are fixedly provided at the bottom of the support frame, and the bottom end of the abutment rods is provided with an arc-shaped sleeve rod that is fixedly connected to the bracket.

[0009] The detection assembly includes a detection lamp fixed to the top of the housing and a fixing frame fixed to the inner wall of the arc-shaped sleeve. A receiving roller is rotatably installed inside the fixing frame, and copper sheets are wound on the receiving roller. The two sets of copper sheets are connected in series with the detection lamp.

[0010] The curved sleeve presses down, contacting the sheet metal of the machine body, creating a gap between the sheet metal and the fixing component. This facilitates the detection of corrosion at the contact point between the fixing component and the sheet metal. Rotating the receiving roller inside the fixing frame causes copper sheets wound on the roller to extend beyond the fixing frame and into the gap between the sheet metal and the fixing component. The copper sheets contact the inner wall of the gap, and the two sets of copper sheets are connected in series with a detection lamp. If the detection lamp illuminates, no corrosion is found at the fixing component; if the detection lamp does not illuminate, corrosion is found at the fixing component. This invention has a simple overall structure, small size, and is easy to carry. It is easy to operate for detecting corrosion of fixing components, saving time and effort, and the detection results are intuitive and visible.

[0011] Further optimization involves connecting a servo motor to one end of the receiving roller, which is fixed outside the fixed frame. Several guide components are installed inside the fixed frame on one side of the receiving roller, and the copper sheet extends out from inside the fixed frame after passing through the guide components. The servo motor drives the receiving roller to rotate, achieving automatic receiving and releasing of the copper sheet. The guide components inside the fixed frame guide the copper sheet, facilitating its precise and rapid insertion into the gap between the sheet metal of the machine body and the fixed components, thereby facilitating the detection of the contact point between the fixed components and the machine body.

[0012] In a further preferred embodiment, the guide component includes a first transmission roller group, a first bending roller, a second transmission roller group, and a second bending roller rotatably mounted between the inner walls of the fixed frame. A through groove is provided at the inner end of the fixed frame, and a guide plate is provided at the inner end of the inner wall of the through groove. The copper sheet extends out of the through groove, and the guide plate presses the copper sheet. By utilizing the downwardly bent guide plate, the copper sheet can be directly guided to the vertical direction, making it convenient for the copper sheet to directly extend into the gap formed after the contact between the fixed component and the machine body.

[0013] In a further optimized design, two telescopic columns are fixedly mounted on the end of the bracket facing the fixed block. These columns slide into the interior of the fixed block, and a first cylinder is fixedly mounted between the two columns. The piston rod of the first cylinder is fixedly connected to the fixed block. The position of the bracket can be driven and adjusted by the first cylinder, thereby changing the distance between the two brackets. This design is suitable for corrosion detection of fixtures of different sizes.

[0014] Further optimized, the arc-shaped sleeve has several through holes for the abutment rod to extend out. The abutment rod and the arc-shaped sleeve are slidably connected, with the abutment rod passing downward through the arc-shaped sleeve. A ball is fixed at the bottom of the abutment rod, and a rubber buffer sleeve is fitted over the ball. By using the buffer sleeve to directly contact the machine body surface, vibration is buffered, further reducing damage to the machine body.

[0015] Further optimization involves two L-shaped connecting rods fixedly mounted on the upper end of the support frame. A bearing plate is positioned above the connecting rods, and at least one second cylinder is mounted on the bearing plate. The piston rod of the second cylinder passes downward through the bearing plate and is fixedly connected to the connecting rods. The bearing plate is fixedly connected to the upper end of the bracket, which is a telescopic rod structure. By driving and adjusting the position of the abutment rods with the second cylinders, the arc-shaped sleeve rods abut against the sheet metal of the machine body, creating a gap between the sheet metal and the fixed components. This facilitates the detection of corrosion at the contact point between the fixed components and the sheet metal. The arc-shaped sleeve rods are arc-shaped, with several sliding abutment rods spreading out along the arc direction. When abutting, all the abutment rods press along a circular area around the fixed components, preventing uneven force on the sheet metal and thus avoiding damage to the machine body.

[0016] In a further optimized design, a guide rod is fixed at each end of the bearing plate, and the guide rod extends downward through the end of the connecting rod. The guide rods provide stability for the lifting and lowering movement of the arc-shaped sleeve.

[0017] The present invention also provides a detection method for a device for detecting corrosion defects in machine body fasteners, comprising the following steps:

[0018] Step 1: Hold the outer casing and place it at the location of the fixing screw on the device to be tested. Cover the fixing part with the outer casing and observe the position of the screw. Place the screw in the center of the outer casing.

[0019] Step 2: Open the first cylinder and adjust the position of the two brackets according to the screw size so that the front end of the fixing frame is located around the screw and in contact with the screw.

[0020] Step 3: After determining the position of the bracket, open the second cylinder to drive the support frame to move down and contact the sheet metal plate of the machine body around the screw through the contact rod;

[0021] Step 4: Press until a gap appears between the screw and the machine body. After the gap appears, turn on the servo motor to drive the collecting roller to rotate, so that the copper sheet wrapped on the collecting roller is conducted out of the fixing frame along the first transmission roller group, the first bending roller, the second transmission roller group, and the second bending roller.

[0022] Step 5: Further, the copper sheet is brought into the gap by the guide plate on the fixed frame, and contacts the inner wall of the gap, so that the two sets of copper sheets are connected in series with the detection lamp.

[0023] Step 6: If the test light is on, there is no corrosion at the contact point between the screw and the machine body;

[0024] Step 7: If the indicator light does not illuminate, corrosion has occurred at the contact point between the screw and the machine body;

[0025] Step 8: After the test is completed, turn on the servo motor again. The servo motor will reverse and collect the copper sheet.

[0026] Compared with the prior art, the beneficial effects of this invention are:

[0027] The curved sleeve presses down, contacting the sheet metal of the machine body, creating a gap between the sheet metal and the fixing component. This facilitates the detection of corrosion at the contact point between the fixing component and the sheet metal. Rotating the receiving roller inside the fixing frame causes copper sheets wound on the roller to extend beyond the fixing frame and into the gap between the sheet metal and the fixing component. The copper sheets contact the inner wall of the gap, and the two sets of copper sheets are connected in series with a detection lamp. If the detection lamp illuminates, no corrosion is found at the fixing component; if the detection lamp does not illuminate, corrosion is found at the fixing component. This invention has a simple overall structure, small size, and is easy to carry. It is easy to operate for detecting corrosion of fixing components, saving time and effort, and the detection results are intuitive and visible. Attached Figure Description

[0028] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0030] Figure 2 yes Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0031] Figure 3 yes Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0032] Figure 4 This is a schematic diagram of the structure of the fixed frame in a specific embodiment of the present invention.

[0033] Figure 5 This is a cross-sectional view of the fixed frame in a specific embodiment of the present invention.

[0034] Figure 6 yes Figure 5 A magnified schematic diagram of the structure at point C.

[0035] In the diagram: 1. Outer shell; 2. Adjustment component; 3. Contact component; 4. Detection component; 5. Battery box; 6. Guide rod; 201. Fixing block; 202. Bracket; 203. Telescopic column; 204. Piston rod; 205. First cylinder; 206. Bearing plate; 207. Support frame; 301. Contact rod; 302. Arc-shaped sleeve rod; 303. Through hole; 304. Connecting rod; 305. Second cylinder; 306. Ball; 307. Buffer sleeve; 401. Detection light; 402. Fixing frame; 403. Receiving roller; 404. Servo motor; 405. First transmission roller group; 406. First bending roller; 407. Second transmission roller group; 408. Second bending roller; 409. Through groove; 410. Guide plate; 411. Copper sheet. Detailed Implementation

[0036] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0037] like Figures 1 to 6 The device for detecting corrosion defects in body fasteners includes an outer shell 1, two adjusting components 2 are provided inside the outer shell 1, a contact component 3 is installed on the adjusting components 2, and a detection component 4 is provided on the inner end of the contact component 3.

[0038] Adjustment component 2 includes a fixing block 201 fixed on the inner wall of the outer shell 1, and a bracket 202 is telescopically connected inside the fixing block 201;

[0039] The abutment component 3 includes a support frame 207 that is slidably connected to the adjustment component 2. Several abutment rods 301 are fixedly provided at the bottom of the support frame 207. The bottom end of the abutment rods 301 is provided with an arc-shaped sleeve rod 302 that is fixedly connected to the bracket 202.

[0040] The detection component 4 includes a detection lamp 401 fixed to the top of the outer casing 1, and a fixing frame 402 fixed to the inner wall of the arc-shaped sleeve 302. A receiving roller 403 is rotatably installed inside the fixing frame 402. Copper sheets 411 are wound on the receiving roller 403. The two sets of copper sheets 411 are connected in series with the detection lamp 401 and also connected in series with the power supply module. The power supply module also provides power to the servo motor 404.

[0041] The arc-shaped sleeve 302 presses down, contacting the sheet metal of the machine body, creating a gap between the sheet metal and the fixing component. This facilitates the detection of corrosion at the contact point between the fixing component and the sheet metal. Rotating the receiving roller 403 inside the fixing frame 402 causes copper sheets 411 wound on the roller 403 to extend beyond the fixing frame 402 and into the gap between the sheet metal and the fixing component. The copper sheets 411 contact the inner wall of the gap, and the two sets of copper sheets 411 are connected in series with the detection lamp 401 for conductivity. If the detection lamp 401 is lit, no corrosion is found at the fixing component; if the detection lamp 401 is not lit, corrosion is found at the fixing component. This invention has a simple overall structure, small size, and is easy to carry. It is easy to operate for detecting corrosion of fixing components, saving time and effort, and the detection results are intuitive and visible.

[0042] The receiving roller 403 is connected to a servo motor 404 at one end, which is fixed to the outside of the fixed frame 402. Several guide members are provided inside the fixed frame 402 on one side of the receiving roller 403. The copper sheet 411 extends out of the fixed frame 402 by passing around the guide members. The servo motor 404 drives the receiving roller 403 to rotate, realizing the automatic receiving and releasing of the copper sheet 411. The guide members provided inside the fixed frame 402 guide the copper sheet 411, making it easy for the copper sheet 411 to accurately and quickly extend into the gap between the sheet metal of the machine body and the fixed member, thereby facilitating the detection of the contact point between the fixed member and the machine body.

[0043] The guide component includes a first transmission roller group 405, a first bending roller 406, a second transmission roller group 407, and a second bending roller 408 rotatably mounted between the inner walls of the fixed frame 402. These components are arranged sequentially along the bending direction of the fixed frame 402. A through groove 409 is provided at the inner end of the fixed frame 402, and a guide plate 410 is provided at the inner end of the inner wall of the through groove 409. A copper sheet 411 passes through the first transmission roller group 405, the first bending roller 406, the second transmission roller group 407, and the second bending roller 408, and extends out of the through groove 409. The guide plate 410 presses the copper sheet 411 against it. The downwardly bending guide plate 410 directly guides the copper sheet to a vertical direction, facilitating its direct insertion into the gap formed by the contact between the fixed component and the machine body.

[0044] The bracket 202 has two telescopic columns 203 fixedly mounted on its end facing the fixing block 201. The telescopic columns 203 slide into the fixing block 201. A first cylinder 205 is fixedly mounted between the two telescopic columns 203. The piston rod 204 of the first cylinder 205 is fixedly connected to the fixing block 201. The first cylinder 205 is powered by a power supply module. The position of the bracket 202 can be driven and adjusted by the first cylinder 205, thereby changing the distance between the two brackets 202. This is suitable for corrosion detection of fasteners of different sizes.

[0045] The arc-shaped sleeve 302 has several through holes 303 for the abutment rod 301 to extend out. The abutment rod 301 and the arc-shaped sleeve 302 are slidably connected. The abutment rod 301 passes downward through the arc-shaped sleeve 302. A ball 306 is fixedly attached to the bottom end of the abutment rod 301, and a rubber buffer sleeve 307 is fitted over the ball 306. The buffer sleeve 307 directly contacts the surface of the machine body to buffer vibration and further reduce damage to the machine body.

[0046] The support frame 207 has two L-shaped connecting rods 304 fixedly installed on its upper end. A bearing plate 206 is installed above the connecting rods 304. At least one second cylinder 305 is installed on the bearing plate 206. The piston rod 204 of the second cylinder 305 passes downward through the bearing plate 206 and is fixedly connected to the connecting rod 304. The bearing plate 206 is fixedly connected to the upper end of the bracket 202. The bracket 202 is a two-section telescopic rod structure. The upper section of the bracket 202 is fixedly connected to the bearing plate 206, and the lower section of the bracket 202 is fixedly connected to the arc-shaped sleeve rod 302. The second cylinder 305 is powered by a power supply module. The second cylinder 305 drives and adjusts the position of the abutment rod 301, and the arc-shaped sleeve rod 302 abuts against the sheet metal of the machine body, so that a gap is created between the sheet metal of the machine body and the fixed parts, which facilitates the detection of corrosion at the contact point between the fixed parts and the sheet metal of the machine body. The arc-shaped sleeve rod 302 is arc-shaped, and several abutment rods 301 are slidably spread out along the arc direction. When all the abutment rods 301 abut against the fixed parts, they can press along the circular area around the fixed parts, so as to avoid uneven force on the sheet metal of the machine body and thus avoid damage to the machine body.

[0047] Each end of the support plate 206 is fixed with a guide rod 6, which extends downward through the end of the connecting rod 304. The guide rods 6 provide stability for the lifting and lowering movement of the arc-shaped sleeve rod 302.

[0048] A battery box 5 is fixedly installed on the outer wall of the outer casing 1, and the power supply module includes a battery installed inside the battery box 5.

[0049] The present invention also provides a detection method for a device for detecting corrosion defects in machine body fasteners, comprising the following steps:

[0050] Step 1: Hold the outer casing 1 and place it at the location of the fixing screw of the machine body to be tested. Cover the fixing part with the outer casing 1 and observe the position of the screw. Place the screw in the center of the outer casing 1.

[0051] Step 2: Open the first cylinder 205, and adjust the position of the two brackets 202 according to the screw size so that the front end of the fixing frame 402 is located around the screw and abuts against the screw.

[0052] Step 3: After determining the position of the bracket 202, open the second cylinder 305, drive the support frame 207 to move down through the second cylinder 305, and abut against the sheet metal plate of the machine body around the screw through the abutment rod 301;

[0053] Step 4: Press until a gap appears between the screw and the machine body. After the gap appears, turn on the servo motor 404 to drive the storage roller 403 to rotate, so that the copper sheet 411 wound on the storage roller 403 is transmitted out of the fixing frame 402 along the first transmission roller group 405, the first bending roller 406, the second transmission roller group 407, and the second bending roller 408.

[0054] Step 5: Further, the copper sheet 411 is brought into the gap by the guide plate 410 on the fixed frame 402 and comes into contact with the inner wall of the gap. Then, the two sets of copper sheets 411 are connected in series with the detection lamp 401 and the power supply module.

[0055] Step 6: If test light 401 is on, then there is no corrosion at the contact point between the screw and the machine body;

[0056] Step 7: If the test light 401 does not light up, corrosion has occurred at the contact point between the screw and the machine body;

[0057] Step 8: After the test is completed, turn on the servo motor 404 again. The servo motor 404 will reverse and collect the copper sheet 411.

[0058] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The terms "upper," "lower," "outer," "inner," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish relative positional relationships and are not necessarily qualitative. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for detecting corrosion defects in machine body fasteners, characterized in that, Includes an outer shell (1), inside which are provided two adjustment components (2), on which are installed a contact component (3), and on the inner end of the contact component (3) are provided a detection component (4); The adjustment component (2) includes a fixing block (201) fixed on the inner wall of the outer shell 1, and a bracket (202) is telescopically connected inside the fixing block (201). The abutment component (3) includes a support frame (207) that is slidably connected to the adjustment component (2). Several abutment rods (301) are fixedly provided at the bottom of the support frame (207). The bottom end of the abutment rod (301) is provided with an arc-shaped sleeve rod (302) that is fixedly connected to the bracket (202). The detection assembly (4) includes a detection lamp (401) fixed on the top of the outer casing (1) and a fixing frame (402) fixed on the inner wall of the arc-shaped sleeve (302). A receiving roller (403) is rotatably installed inside the fixing frame (402). Copper sheets (411) are wound on the receiving roller (403). The two sets of copper sheets (411) are connected in series with the detection lamp (401).

2. The device for detecting corrosion defects in machine body fasteners according to claim 1, characterized in that, One end of the receiving roller (403) is connected to a servo motor (404), which is fixed outside the fixed frame (402). Several guides are provided inside the fixed frame (402) on one side of the receiving roller (403), and the copper sheet (411) extends out from inside the fixed frame (402) around the guides.

3. The device for detecting corrosion defects in machine body fasteners according to claim 2, characterized in that, The guide includes a first transmission roller group (405), a first bending roller (406), a second transmission roller group (407), and a second bending roller (408) rotatably mounted between the inner walls of the fixed frame (402). A through groove (409) is provided at the inner end of the fixed frame (402), and a guide plate (410) is provided at the inner end of the inner wall of the through groove (409). A copper sheet (411) extends out from the through groove (409), and the guide plate (410) presses the copper sheet (411) against the guide plate (411).

4. The device for detecting corrosion defects in machine body fasteners according to claim 1, characterized in that, The bracket (202) is fixedly provided with two telescopic columns (203) facing the fixed block (201). The telescopic columns (203) slide into the fixed block (201). A first cylinder (205) is fixedly provided between the two telescopic columns (203). The piston rod (204) of the first cylinder (205) is fixedly connected to the fixed block (201).

5. The device for detecting corrosion defects in machine body fasteners according to claim 1, characterized in that, The arc-shaped sleeve (302) has several through holes (303) for the abutment rod (301) to extend out. The abutment rod (301) and the arc-shaped sleeve (302) are slidably connected. The abutment rod (301) passes downward through the arc-shaped sleeve (302). A ball (306) is fixed at the bottom of the abutment rod (301). A rubber buffer sleeve (307) is fitted over the ball (306).

6. A device for detecting corrosion defects in machine body fasteners according to claim 1 or 4, characterized in that, The upper end of the support frame (207) is fixedly provided with two L-shaped connecting rods (304). Above the connecting rods (304) is a bearing plate (206). At least one second cylinder (305) is provided on the bearing plate (206). The piston rod (204) of the second cylinder (305) passes downward through the bearing plate (206) and is fixedly connected to the connecting rod (304). The bearing plate (206) is fixedly connected to the upper end of the bracket (202). The bracket (202) is a telescopic rod structure.

7. The device for detecting corrosion defects in body fasteners according to claim 6, characterized in that, A guide rod (6) is fixed at each end of the bearing plate (206), and the guide rod (6) passes downward through the end of the connecting rod (304).

8. A method of using a device for detecting corrosion defects in machine body fasteners, characterized in that, A device for detecting corrosion defects in body fasteners is adopted. The device includes an outer shell (1), two adjustment components (2) are provided inside the outer shell (1), a contact component (3) is installed on the adjustment component (2), and a detection component (4) is provided on the inner end of the contact component (3). The adjustment component (2) includes a fixing block (201) fixed on the inner wall of the outer shell 1, and a bracket (202) is telescopically connected inside the fixing block (201). The abutment component (3) includes a support frame (207) that is slidably connected to the adjustment component (2). Several abutment rods (301) are fixedly provided at the bottom of the support frame (207). The bottom end of the abutment rod (301) is provided with an arc-shaped sleeve rod (302) that is fixedly connected to the bracket (202). The detection assembly (4) includes a detection lamp (401) fixed on the top of the outer shell (1), and a fixing frame (402) fixed on the inner wall of the arc-shaped sleeve (302). A receiving roller (403) is rotatably installed inside the fixing frame (402). Copper sheets (411) are wound on the receiving roller (403). The two sets of copper sheets (411) are connected in series with the detection lamp (401). One end of the receiving roller (403) is connected to a servo motor (404), and several guides are provided in the fixed frame (402) on one side of the receiving roller (403). The copper sheet (411) extends out from the fixed frame (402) by passing through the guides. The guide includes a first transmission roller group (405), a first bending roller (406), a second transmission roller group (407), and a second bending roller (408) that are rotatably mounted between the inner walls of the fixed frame (402). The bracket (202) is fixedly provided with two telescopic columns (203) facing the fixed block (201), and a first cylinder (205) is fixedly provided between the two telescopic columns (203). The piston rod (204) of the first cylinder (205) is fixedly connected to the fixed block (201). The upper end of the support frame (207) is fixedly provided with two L-shaped connecting rods (304), and a bearing plate (206) is provided above the connecting rods (304). At least one second cylinder (305) is provided on the bearing plate (206). The piston rod (204) of the second cylinder (305) passes downward through the bearing plate (206) and is fixedly connected to the connecting rod (304). Includes the following steps: Step 1: Hold the outer casing (1) and place it at the position of the fixing screw of the machine body to be tested. Cover the outer casing (1) over the fixing part and observe the position of the screw. Place the screw at the center of the outer casing (1). Step 2: Open the first cylinder (205), adjust the position of the two brackets (202) according to the screw size, so that the front end of the fixing frame (402) is located around the screw and abuts against the screw. Step 3: After determining the position of the bracket (202), open the second cylinder (305), drive the support frame (207) to move down through the second cylinder (305), and use the abutment rod (301) to abut against the sheet metal plate of the machine body around the screw; Step 4: Press until a gap appears between the screw and the machine body. After the gap appears, turn on the servo motor (404) to drive the receiving roller (403) to rotate, so that the copper sheet (411) wound on the receiving roller (403) is transmitted out of the fixing frame (402) along the first transmission roller group (405), the first bending roller (406), the second transmission roller group (407), and the second bending roller (408). Step 5: Further, the copper sheet (411) is brought into the gap by the guide plate (410) on the fixed frame (402), and contacts the inner wall of the gap, so that the two sets of copper sheets (411) are connected in series with the detection lamp (401). Step 6: If the test light (401) is on, then there is no corrosion at the contact point between the screw and the body; Step 7: If the test light (401) does not light up, corrosion has occurred at the contact point between the screw and the machine body; Step 8: After the test is completed, turn on the servo motor (404) again. The servo motor (404) reverses and collects the copper sheet (411).

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