A metal plate welding defect detection device

Abstract

The application relates to the technical field of ultrasonic flaw detection, in particular to a metal sheet metal welding defect detection device, which comprises a flaw detection main part, an angle adjusting part is installed on the flaw detection main part, and a coupling agent is filled in the angle adjusting part; the angle adjusting part and the flaw detection main part are sealed; a negative pressure maintaining part is installed on the angle adjusting part; a sealing prompting part is installed on the negative pressure maintaining part; a coupling agent pushing part is installed on the angle adjusting part; the rotary shell and the sleeve shell are sealed and fitted, the rotary shell can rotate and adjust in the sleeve shell, the angle of the ultrasonic sensor can be adjusted, the detection flexibility can be improved, the rotary shell and the sleeve shell are filled with the coupling agent, and the sound wave can be efficiently conducted when the rotary shell is rotated and the angle is adjusted; the problem that the existing metal sheet metal welding defect detection device cannot quickly adjust the detection angle in the state of sealing the coupling agent is solved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic flaw detection technology, specifically to a device for detecting welding defects in sheet metal. Background Technology

[0002] In actual sheet metal processing, welding of sheet metal is frequently involved. During the welding process, various defects are easily generated at the welded parts due to factors such as welding process parameters, base material, operational precision, and environment. Defect detection is necessary after welding. Ultrasonic testing can effectively detect hidden defects and has the advantages of high sensitivity and high precision. Current sheet metal welding defect detection devices use ultrasonic sensors for flaw detection. Although this can directly reflect the defect situation, in actual defect detection, it is necessary to ensure that the bottom of the ultrasonic sensor is in contact with the metal surface outside the weld and to apply a coupling agent to prevent interference with ultrasonic transmission. However, in actual flaw detection, it is necessary to disassemble and replace ultrasonic sensors at different angles, which affects the defect detection efficiency. At the same time, the defect detection flexibility is not good, and it is not convenient to quickly adjust the detection angle while the coupling agent is sealed. In addition, traditional ultrasonic sensors are not easy to automatically replenish the coupling agent during flaw detection. The method of manually dripping the coupling agent onto the metal surface is time-consuming and labor-intensive. Moreover, when flaw detection is performed at an angle, the coupling agent will spread quickly, which is not convenient for automatic control to ensure that ultrasonic defect detection is performed with sufficient coupling agent. Summary of the Invention

[0003] The purpose of this invention is to provide a metal sheet welding defect detection device to solve the problems mentioned in the background art, such as the inconvenience of quickly adjusting the detection angle in the state of sealed coupling agent, and the inconvenience of automatically replenishing coupling agent when traditional ultrasonic sensors are used for flaw detection.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a metal sheet metal welding defect detection device, comprising a flaw detection main body, an angle adjustment component mounted on the flaw detection main body, the angle adjustment component being filled with a coupling agent; a seal between the angle adjustment component and the flaw detection main body; a negative pressure holding component mounted on the angle adjustment component; a sealing indication component mounted on the negative pressure holding component; a coupling agent pushing component mounted on the angle adjustment component; and a safety control component mounted on the coupling agent pushing component; the flaw detection main body includes: an ultrasonic sensor and a rotating shell, the rotating shell being fixedly sleeved on the outside of the ultrasonic sensor, and the two sides of the rotating shell being arc-shaped structures; and an external display connected to the ultrasonic sensor.

[0005] Preferably, the flaw detection main component further includes: a pointer, a mounting post, and a laser light; the pointer is fixedly mounted on the rotating shell; the mounting post is fixedly mounted on the rotating shell, and the laser light is fixedly mounted on the mounting post; the angle of the laser light is consistent with the sound wave emission direction of the ultrasonic sensor.

[0006] Preferably, the angle adjustment component includes: a housing, a storage groove, and a sponge pad. The housing has arc-shaped structures on both sides inside, and the housing is fitted onto the rotating shell, with the rotating shell and the housing in a sealed fit. The housing has a storage groove, and the bottom of the storage groove has a row of through holes. A sponge pad is fixedly installed at the bottom of the housing, and the sponge pad is used to replenish coupling agent to the bottom of the glass slide. The housing is filled with coupling agent. The bottom of the sponge pad protrudes from the bottom of the housing. A rubber pad is provided on the side of the housing.

[0007] Preferably, the angle adjustment component further includes a glass plate, which is fixedly installed at the bottom of the housing and is flush with the bottom of the housing.

[0008] Preferably, the negative pressure retaining component includes: a negative pressure retaining tube, a negative pressure tube, and a shielding cover. The negative pressure retaining tube is fixedly installed on the housing and communicates with the housing. A negative pressure tube is fixedly installed on the negative pressure retaining tube. A shielding cover is fixedly installed on the top of the negative pressure tube.

[0009] Preferably, the sealing indicator includes: a piston rod and a suction tube, wherein the piston rod is slidably sleeved inside the negative pressure maintaining tube; the suction tube is fixedly installed on the piston rod; the suction tube is provided with a valve; the suction tube passes through the cover; the piston rod is provided with a through hole; the suction tube is used to maintain the negative pressure state inside the negative pressure tube; and a rubber ring is provided on the outside of the piston rod.

[0010] Preferably, the sealing indicator further includes a detection spring, which is sleeved inside the negative pressure tube; one end of the detection spring is fixedly connected to the bottom of the cover, and the other end of the detection spring is fixedly connected to the piston rod.

[0011] Preferably, the coupling agent pusher includes: a shaft support plate and an extrusion shaft, the shaft support plate being fixedly mounted on the housing; the shaft support plate having a row of scales; the pointer being located on the front side of the shaft support plate; and the extrusion shaft being fixedly mounted on the top of the shaft support plate.

[0012] Preferably, the coupling agent pusher further includes: a sliding shaft, a piston plate, and a pusher spring. The sliding shaft is slidably inserted into the shaft frame plate. The piston plate is fixedly installed at the bottom of the sliding shaft, and a rubber ring is provided on the outer side of the piston plate. The piston plate is sleeved inside the accumulation groove. The pusher spring is sleeved on the sliding shaft. When the sliding shaft is pulled up to move the piston plate to the bottom of the shaft frame plate, the bottom of the piston plate is higher than the sleeve.

[0013] Preferably, the safety control component includes: a switch mounting plate and a micro switch, wherein the switch mounting plate is fixedly mounted on the top of the slide shaft; one end of the push spring is fixedly connected to the switch mounting plate, and the other end of the push spring is fixedly connected to the shaft bracket plate; a micro switch is fixedly mounted on the bottom of the switch mounting plate; the extrusion shaft is aligned with the micro switch; and the micro switch is electrically connected to an ultrasonic sensor.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a sealed fit between a rotating shell and a sleeve, while the rotating shell can be rotated and adjusted inside the sleeve to adjust the angle of the ultrasonic sensor, thereby improving detection flexibility. At the same time, a coupling agent is filled between the rotating shell and the sleeve, which can maintain efficient sound wave transmission and reduce loss when the rotating shell is rotated to adjust the angle, thus ensuring that the ultrasonic sensor angle is adjustable while maintaining detection accuracy.

[0015] The use of a sealing indicator in conjunction with a negative pressure retainer can maintain the inner side of the housing under negative pressure, facilitating leak detection. The use of a detection spring facilitates the detection of the seal between the rotating shell and the housing, and can promptly alert the user in case of leakage, avoiding detection interference caused by leakage.

[0016] The use of a couplant pusher facilitates continuous replenishment of couplant after storage. The couplant is applied to the metal surface outside the weld, ensuring the bottom of the glass plate remains in contact with the metal surface outside the weld through the couplant, thus reducing sound wave loss. Furthermore, this structure utilizes a push spring to elastically pull the piston plate to push the couplant, allowing for real-time couplant replenishment even at tilted detection positions. In conjunction with a microswitch, it reminds operators to maintain a couplant supply in the storage tank when using the ultrasonic sensor for flaw detection, preventing data interference caused by defect detection without couplant. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a metal sheet metal welding defect detection device of the present invention connected to a display. Figure 2 This is a schematic diagram of the overall structure of a metal sheet metal welding defect detection device according to the present invention; Figure 3 This is a cross-sectional view of the internal structure of a metal sheet metal welding defect detection device according to the present invention. Figure 4 This is a schematic diagram of the flaw detection main component structure of the present invention; Figure 5 This is a schematic diagram of the angle adjustment component structure of the present invention; Figure 6 This is a schematic diagram of the glass sheet mounting position according to the present invention; Figure 7This is a schematic diagram of the negative pressure retainer structure of the present invention; Figure 8 For the present invention Figure 2 Enlarged view of the structure of region B in the middle; Figure 9 This is a cross-sectional view of the piston plate mounting position according to the present invention; Figure 10 This is a schematic diagram of the coupling agent pusher structure of the present invention.

[0018] In the attached diagram, the components represented by each number are as follows: 1. Flaw detection main component; 101. Ultrasonic sensor; 102. Rotating shell; 1021. Pointer; 103. Mounting post; 104. Laser light; 2. Angle adjustment component; 201. Housing; 2011. Accumulation tank; 202. Sponge pad; 203. Glass plate; 3. Negative pressure holding component; 301. Negative pressure holding tube; 302. Negative pressure tube; 303. Cover; 4. Sealing indicator component; 401. Piston column; 402. Suction tube; 403. Detection tension spring; 5. Coupling agent pusher component; 501. Shaft bracket plate; 502. Extrusion shaft; 503. Sliding shaft; 504. Piston plate; 505. Push tension spring; 6. Safety control component; 601. Switch mounting plate; 602. Micro switch. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a technical solution: such as Figures 1 to 10 The device for detecting welding defects in sheet metal, as shown, includes a flaw detection main body 1, an angle adjustment component 2 installed on the flaw detection main body 1, the angle adjustment component 2 being filled with a coupling agent; a seal between the angle adjustment component 2 and the flaw detection main body 1; a negative pressure holding component 3 installed on the angle adjustment component 2; a sealing indication component 4 installed on the negative pressure holding component 3; a coupling agent pushing component 5 installed on the angle adjustment component 2; and a safety control component 6 installed on the coupling agent pushing component 5. The flaw detection main body 1 includes an ultrasonic sensor 101 and a rotating shell 102, which can be an A1209 type ultrasonic sensor 101 and its matching display. The rotating shell 102 is fixedly sleeved on the outside of the ultrasonic sensor 101, and the two sides of the rotating shell 102 are arc-shaped structures; the ultrasonic sensor 101 is connected to an external display.

[0021] The flaw detection main component 1 also includes: a pointer 1021, a mounting post 103, and a laser lamp 104. The pointer 1021 is fixedly mounted on the rotating shell 102; the mounting post 103 is fixedly mounted on the rotating shell 102, and the laser lamp 104 is fixedly mounted on the mounting post 103; the angle of the laser lamp 104 is consistent with the sound wave emission direction of the ultrasonic sensor 101; the angle adjustment component 2 includes: a housing 201, a storage tank 2011, and a sponge pad 202, the inner sides of the housing 201 are arc-shaped. The structure is shaped like a shell, with the housing 201 fitted onto the rotating shell 102, and the rotating shell 102 and the housing 201 sealingly fitted together; the housing 201 has an accumulation groove 2011, and the bottom of the accumulation groove 2011 has a row of through holes; a sponge pad 202 is fixedly installed at the bottom of the housing 201, and the sponge pad 202 is used to replenish coupling agent to the bottom of the glass plate 203; the housing 201 is filled with coupling agent; the bottom of the sponge pad 202 protrudes from the bottom of the housing 201; rubber pads are provided on the sides of the housing 201; corners The angle adjustment component 2 also includes a glass plate 203, which is fixedly installed at the bottom of the housing 201 and is flush with the bottom of the housing 201. The rotating housing 102 and the housing 201 are sealed together, and the rotating housing 102 can rotate and adjust inside the housing 201 to adjust the angle of the ultrasonic sensor 101, improving detection flexibility. A coupling agent is filled between the rotating housing 102 and the housing 201, ensuring efficient sound wave transmission and reducing loss when the rotating housing 102 is adjusted. This ensures that the angle of the ultrasonic sensor 101 is adjustable while maintaining detection accuracy. A laser lamp 104 follows the rotation of the rotating housing 102 to adjust the angle, and the laser beam is projected onto the weld seam, making it easy for humans to determine the current ultrasonic emission direction. The pointer 1021 also rotates with the laser, and the operator can determine the current ultrasonic emission angle by observing the alignment of the pointer 1021 with a row of scales on the shaft support plate 501.

[0022] The negative pressure retaining component 3 includes: a negative pressure retaining tube 301, a negative pressure tube 302, and a shielding cover 303. The negative pressure retaining tube 301 is fixedly installed on the housing 201 and communicates with the housing 201. The negative pressure tube 302 is fixedly installed on the negative pressure retaining tube 301. The shielding cover 303 is fixedly installed on the top of the negative pressure tube 302. The sealing indicator component 4 includes: a piston rod 401 and a suction tube 402. The piston rod 401 is slidably sleeved on the negative pressure retaining tube. Inside 301; a suction tube 402 is fixedly installed on the piston column 401; a valve is provided on the suction tube 402; the suction tube 402 passes through the cover 303; a through hole is provided on the piston column 401; the suction tube 402 is used to maintain negative pressure inside the negative pressure tube 302; a rubber ring is provided on the outside of the piston column 401; the sealing indicator 4 also includes: a detection spring 403, which is sleeved inside the negative pressure tube 302; one end of the detection spring 403 is fixedly connected to the cover 303. At the bottom, the other end of the detection spring 403 is fixedly connected to the piston column 401. The sealing indicator 4, in conjunction with the negative pressure retaining element 3, can be used to keep the coupling agent inside the casing 201 in a negative pressure state, which facilitates leak detection. The detection spring 403 can facilitate the detection of the seal between the rotating shell 102 and the casing 201, and can promptly indicate when a leak occurs, avoiding detection interference caused by the leak. The structure is simple to control. First, open the valve on the suction pipe 402 and pour the coupling agent into the suction pipe 402. At this time, the suction pipe 402 can be manually pressed down, which will drive the piston column 401 to move down. Then close the valve on the suction pipe 402. At this time, under the pull of the detection spring 403, the piston column 401 generates an upward pulling force, and the rotating shell 102 and the casing 201 are in a negative pressure state. If there is a leak between the rotating shell 102 and the casing 201, the suction pipe 402 will move up, and the operator can be notified in time.

[0023] The coupling agent pusher 5 includes: a shaft support plate 501 and a compression shaft 502. The shaft support plate 501 is fixedly mounted on the housing 201. A row of scales is provided on the shaft support plate 501. A pointer 1021 is located on the front side of the shaft support plate 501. The compression shaft 502 is fixedly mounted on the top of the shaft support plate 501. The coupling agent pusher 5 also includes: a sliding shaft 503, a piston plate 504, and a pusher spring 505. The sliding shaft 503 is slidably inserted into the shaft support plate 501. The piston plate 504 is fixedly mounted on the bottom of the sliding shaft 503, and a rubber ring is provided on the outer side of the piston plate 504. The piston plate 504 is sleeved inside the accumulation tank 2011. A push spring 505 is sleeved on the slide shaft 503; when the slide shaft 503 is pulled up, causing the piston plate 504 to move upward to the bottom of the shaft frame plate 501, the bottom of the piston plate 504 is higher than the housing 201; the safety control component 6 includes: a switch mounting plate 601 and a micro switch 602, the switch mounting plate 601 is fixedly mounted on the top of the slide shaft 503; one end of the push spring 505 is fixedly connected to the switch mounting plate 601, and the other end of the push spring 505 is fixedly connected to the shaft frame plate 501; a micro switch 602 is fixedly mounted on the bottom of the switch mounting plate 601; the pressing shaft 502 is aligned with the micro switch 602; The microswitch 602 is electrically connected to the ultrasonic sensor 101. The use of a couplant pusher 5 facilitates the continuous replenishment of couplant after storage. The couplant is applied to the metal surface outside the weld, ensuring the bottom of the glass plate 203 remains in contact with the metal surface outside the weld through the couplant, reducing sound wave loss. Simultaneously, this structure utilizes a push spring 505 to elastically pull the piston plate 504 to push the couplant, allowing for real-time couplant replenishment even at tilted detection positions. The couplant is replenished while it flows, avoiding the time-consuming and labor-intensive method of manually dripping couplant. Furthermore, in conjunction with the microswitch 602, it can... This is to remind staff that when using the ultrasonic sensor 101 for flaw detection, there needs to be a supply of coupling agent inside the accumulation tank 2011 to avoid defect detection without coupling agent, which would cause data interference. This ensures direct and accurate detection, allowing staff to focus more on observing the displayed results. As the coupling agent inside the accumulation tank 2011 is depleted, the slide shaft 503 will continuously drive the piston plate 504 to move downwards, causing the switch mounting plate 601 and the micro switch 602 to move downwards together, until the micro switch 602 is pressed against the top of the pressing shaft 502. At this point, the ultrasonic sensor 101 will automatically cut off the power, providing a prompt.

[0024] Working principle: First, open the valve on the suction tube 402 and fill the suction tube 402 with coupling agent. At this time, the suction tube 402 can be manually pressed down, causing the piston column 401 to move downward. Then, close the valve on the suction tube 402. At this time, under the pull of the detection spring 403, the piston column 401 generates an upward pulling force, and a negative pressure state is formed between the rotating shell 102 and the sleeve 201. If there is a leak between the rotating shell 102 and the sleeve 201, making it difficult to maintain the negative pressure state, the piston column 401 will be pulled by the detection spring 403. The suction tube 402 will move upwards again, allowing for timely detection and leak testing. This provides a direct and timely indication of seal failure, preventing leaks from affecting detection accuracy. During defect detection, the sliding shaft 503 is pulled up, causing the piston plate 504 to move upwards. Coupling agent is then filled into the accumulation tank 2011. The sliding shaft 503 is then released, and the piston plate 504 is pushed downwards by the push spring 505, squeezing the coupling agent out of the through-hole at the bottom of the accumulation tank 2011 and wetting the sponge pad 2. 02. At this point, as the housing 201 is manually moved and its position adjusted, the coupling agent applied to the metal surface outside the weld by the moistened sponge pad 202 simultaneously adheres to the bottom of the glass plate 203. When performing weld defect detection, the angle adjustment piece 2 is held by hand, and the glass plate 203 is placed against the metal plate surface outside the weld. The rotating housing 102 can be manually rotated to adjust the detection angle of the ultrasonic sensor 101, allowing for oblique detection of weld defects. During this process, the coupling agent filling the space between the rotating housing 102 and the housing 201 assists in the transmission of ultrasonic waves. The ultrasonic sensor 101 can be observed in real time on the external display to check for defects. As the coupling agent inside the accumulation tank 2011 is depleted, the sliding shaft 503 will continue to drive the piston plate 504 to move down under the continuous pull of the push spring 505, which will drive the switch mounting plate 601 and the micro switch 602 to move down together until the micro switch 602 is pressed against the top of the extrusion shaft 502. At this time, the ultrasonic sensor 101 will automatically cut off the power and provide a prompt that the coupling agent needs to be replenished in the accumulation tank 2011 in time.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal sheet metal welding defect detection device, comprising a flaw detection main body (1), wherein an angle adjustment component (2) is installed on the flaw detection main body (1), characterized in that: The angle adjustment component (2) is filled with a coupling agent; the angle adjustment component (2) and the flaw detection main body (1) are sealed; a negative pressure retainer (3) is installed on the angle adjustment component (2); a sealing indicator (4) is installed on the negative pressure retainer (3). The angle adjustment component (2) is equipped with a coupling agent pusher (5); the coupling agent pusher (5) is equipped with a safety control component (6); The flaw detection main component (1) includes: an ultrasonic sensor (101) and a rotating shell (102). The ultrasonic sensor (101) is fixedly sleeved with the rotating shell (102) on the outside, and the two sides of the rotating shell (102) are arc-shaped structures. The ultrasonic sensor (101) is connected to an external display.

2. The metal sheet metal welding defect detection device according to claim 1, characterized in that: The flaw detection main component (1) further includes: a pointer (1021), a mounting post (103), and a laser lamp (104). The pointer (1021) is fixedly installed on the rotating shell (102); the mounting post (103) is fixedly installed on the rotating shell (102), and the laser lamp (104) is fixedly installed on the mounting post (103); the angle of the laser lamp (104) is consistent with the sound wave emission direction of the ultrasonic sensor (101).

3. The metal sheet metal welding defect detection device according to claim 1, characterized in that: The angle adjustment component (2) includes: a housing (201), an accumulation groove (2011), and a sponge pad (202). The housing (201) has an arc-shaped structure on both sides inside, and the housing (201) is fitted onto the rotating shell (102), and the rotating shell (102) and the housing (201) are sealed together. The housing (201) has an accumulation groove (2011) and a row of through holes at the bottom. The sponge pad (202) is fixedly installed at the bottom of the housing (201), and the sponge pad (202) is used to replenish coupling agent to the bottom of the glass plate (203). The housing (201) is filled with coupling agent. The bottom of the sponge pad (202) protrudes from the bottom of the housing (201). The side of the housing (201) is provided with a rubber pad.

4. The metal sheet metal welding defect detection device according to claim 3, characterized in that: The angle adjustment component (2) further includes a glass sheet (203), which is fixedly installed at the bottom of the housing (201) and is flush with the bottom of the housing (201).

5. The metal sheet metal welding defect detection device according to claim 3, characterized in that: The negative pressure retaining component (3) includes: a negative pressure retaining tube (301), a negative pressure tube (302), and a shielding cover (303). The negative pressure retaining tube (301) is fixedly installed on the housing (201) and the negative pressure retaining tube (301) communicates with the housing (201). The negative pressure tube (302) is fixedly installed on the negative pressure retaining tube (301). The shielding cover (303) is fixedly installed on the top of the negative pressure tube (302).

6. The metal sheet metal welding defect detection device according to claim 5, characterized in that: The sealing indicator (4) includes: a piston rod (401) and a suction tube (402). The piston rod (401) is slidably sleeved inside the negative pressure holding tube (301). The suction tube (402) is fixedly installed on the piston rod (401). A valve is provided on the suction tube (402). The suction tube (402) passes through the cover (303). A through hole is provided on the piston rod (401). The suction tube (402) is used to maintain the negative pressure inside the negative pressure tube (302). A rubber ring is provided on the outside of the piston rod (401).

7. The metal sheet metal welding defect detection device according to claim 6, characterized in that: The sealing indicator (4) further includes: a detection spring (403), which is sleeved inside the negative pressure tube (302); one end of the detection spring (403) is fixedly connected to the bottom of the cover (303), and the other end of the detection spring (403) is fixedly connected to the piston column (401).

8. The metal sheet metal welding defect detection device according to claim 3, characterized in that: The coupling agent pusher (5) includes: a shaft frame plate (501) and an extrusion shaft (502). The shaft frame plate (501) is fixedly installed on the housing (201). A row of scales is provided on the shaft frame plate (501). The pointer (1021) is located on the front side of the shaft frame plate (501). The extrusion shaft (502) is fixedly installed on the top of the shaft frame plate (501).

9. A metal sheet metal welding defect detection device according to claim 8, characterized in that: The coupling agent pusher (5) further includes: a sliding shaft (503), a piston plate (504), and a push spring (505). The sliding shaft (503) is slidably inserted into the shaft frame plate (501). The piston plate (504) is fixedly installed at the bottom of the sliding shaft (503), and a rubber ring is provided on the outer side of the piston plate (504). The piston plate (504) is sleeved inside the accumulation groove (2011). The push spring (505) is sleeved on the sliding shaft (503). When the sliding shaft (503) is lifted and the piston plate (504) is moved up to fit the bottom of the shaft frame plate (501), the bottom of the piston plate (504) is higher than the housing (201).

10. A metal sheet metal welding defect detection device according to claim 9, characterized in that: The safety control component (6) includes: a switch mounting plate (601) and a micro switch (602). The switch mounting plate (601) is fixedly mounted on the top of the slide shaft (503). One end of the push spring (505) is fixedly connected to the switch mounting plate (601), and the other end of the push spring (505) is fixedly connected to the shaft frame plate (501). The micro switch (602) is fixedly mounted on the bottom of the switch mounting plate (601). The extrusion shaft (502) is aligned with the micro switch (602). The micro switch (602) is electrically connected to the ultrasonic sensor (101).

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