WO2022262044A1 - Weldment quality measurement apparatus based on internet of things and measurement method thereof - Google Patents

Abstract

A weldment quality measurement apparatus based on Internet of Things and a measurement method thereof. The weldment quality measurement apparatus comprises a measurement apparatus, a feeding assembly, and a material management apparatus; support seats in the feeding assembly are provided with a positioning system; one welded pipe fitting corresponds to one support seat; a weldment needing to be measured is positioned in real time by means of the Internet of Things, and a positioning signal is sent to a terminal device, such that a worker can search for the position of the weldment at any time; the weldment passes through the measurement apparatus having a multi-directional visual measurement system; the visual measurement system automatically identifies and determines whether the weldment has a defect or not and photographs the defect and uploads same to a database; the terminal device is connected to the database, such that the worker can be effectively ensured to monitor the weldment at any time; upon the completion of data storage, the material management apparatus classifies the welded pipe fittings having different defects; a robot stacks and stores the measured welded pipe fittings in order; and the weldments are placed in the support seats all the time, and the positioning is sent in real time, such that the worker can search at any time more conveniently.

Description

A weldment quality detection device and detection method based on the Internet of Things technical field

The invention relates to a weldment detection device, in particular to a weldment quality detection device and a detection method based on the Internet of Things.

Background technique

The welding process is one of the effective means of fixing the connection, and the welding quality will directly affect the safety and reliability of the weldment and the integrity of the welding structure. Welding quality inspection refers to the inspection of welding results. Defects in weld quality have a great impact on the strength of weldments, making the quality unstable in the process and easy to cause accidents. Therefore, in addition to the welding technology and welding process In addition to the requirements, welding quality inspection is also an important part of the quality management of welded structures.

However, in the traditional weldment inspection method, weldment inspection information is manually recorded and each unit does not have timely information interaction, and workers in other production lines cannot obtain the current inspection status of weldments in real time. And after the weldment is inspected, it is randomly placed and placed. When workers need to check the weldment status of the weldment in advance, they often look for it among many weldments. This not only reduces work efficiency, but also wastes a lot of time for workers. The traditional weldment surface defect detection device adopts automatic detection technology, which is limited to the system algorithm in the process of judging the weldment surface, and there are errors in the detection results of different defect shapes, resulting in missed detection and wrong detection.

technical problem

A weldment quality detection device and detection method based on the Internet of Things are provided, which effectively solve the above-mentioned problems existing in the prior art.

technical solution

A weldment quality inspection device based on the Internet of Things, including three parts: a detection device, a feeding component, and a material management device.

Wherein, the detection device includes a workbench, a first clamping assembly slidably connected to the workbench, a visual inspection assembly movably connected to one side of the first clamping assembly, and a visual inspection assembly fixed on one side of the visual inspection assembly. side of the second clamping assembly;

The feeding assembly includes a first conveyor belt fixed on one side of the workbench, and a support seat for positioning weldments. The support seat runs through the conveyor belt; The signal is sent to the terminal equipment, which is convenient for workers to find the inspection status of weldments at any time.

The material management device includes a second conveyor belt fixed on the other side of the workbench, and a material distribution mechanism arranged parallel to the starting end of the second conveyor belt, and the second conveyor belt is symmetrically arranged on both sides of the material distribution mechanism. side. The material management device classifies the inspected weldments, which is convenient for direct follow-up operations on non-defective weldments. The manipulator stacks the sorted weldments in an orderly manner, which can effectively improve the efficiency of workers in searching for weldments.

In a further embodiment, the visual detection assembly includes a base, guide rods disposed opposite to each other at both ends of the base, and a plurality of visual detectors respectively disposed along the vertical and horizontal directions of the guide rods. The visual detectors are set in four directions along the circumference. The multi-directional visual detectors effectively ensure the accuracy of weldment defects and the uncertainty of the size of the weldments. The visual detectors can move along the predetermined direction through the guide rod, so that the visual detectors Corresponding to the position of the weld, avoid missing the shooting angle, and analyze the image through the system to judge the weldment defect.

In a further embodiment, one side of the base is slidably connected to the workbench along the transverse direction, and a visual detector is slidably connected to the other side along the longitudinal direction. The movement of the base and the movement of the vision detector effectively expands the detectable range.

In a further embodiment, the guide rod includes a first guide rod fixedly installed along one end of the base, and a second guide rod movably connected to the other end, and one end of the first guide rod is movably connected to a first visual detection detector, the other end is vertically movable with the first visual detector through a connecting block and is provided with a second visual detector, and the second guide rod is movably connected with a third visual detector, and the third visual detector is connected to the first visual detector. The vision detectors are arranged horizontally to form the detection area. The movable visual detector can effectively expand the range of detectable weldment dimensions, and multi-directional shooting can effectively avoid detection omissions.

In a further embodiment, both the first clamping assembly and the second clamping assembly include a transition plate vertically connected to the workbench, a plurality of telescopic components vertically fixedly connected to one side of the transition plate, And a lifting block slidingly connected along one side of the transition plate at a predetermined distance. The cross-section of the lifting block is L-shaped, and the two ends realize the lifting movement through the pulley and the slide rail provided on one side of the transition plate. The lifting block is used to adjust the height of the weldment so that it is separated from the support seat, so as to avoid affecting the detection accuracy. The telescopic assembly is arranged in three directions around the transition plate, which can play an automatic centering role when clamping the weldment.

In a further embodiment, the telescopic assembly includes a positioning block distributed along the edge of the transition plate, a telescopic rod vertically and movably connected to the positioning block, and a suction cup is fixedly arranged at one end of the telescopic rod. After the lifting block lifts the weldment to the predetermined position, the clamping force on the weldment can be adjusted through the telescopic rod, and one end of the telescopic rod uses a suction cup to vacuum fix the weldment, which effectively reduces the pressure on the surface of the weldment during the clamping process. damage.

In a further embodiment, the support seat includes a bottom plate, a plurality of splints evenly distributed on the bottom plate, and a support member fixedly arranged in the middle of the splint, and the splint has a trumpet-shaped cross-section and is elastic. shrapnel. Multiple splints are evenly distributed to disperse the pressure of the weldment on the splint, effectively avoiding damage to the splint by the weldment, and the support at the bottom supports the weldment to improve the stability of the weldment placed in the splint. The support in the splint At the same time as the splint with elastic properties, it can have a buffering effect on the weldment when it is placed.

In a further embodiment, the distributing mechanism is rotatably connected to the support, and includes a moving block that moves longitudinally along the support, and a displacement seat that is slidably connected with the moving block, and the displacement seat is along a straight line inside the moving block. Move to form the distribution area. The material distributing mechanism can effectively classify according to the defects of weldments, which is convenient for workers to search.

Based on the above-mentioned detection method of a weldment quality detection device based on the Internet of Things, the method comprises the following steps:

S1. Place the weldment in the support seat and place it on the first conveyor belt;

S2, the motor is energized, and the second guide rod moves to the side of the base to approach the clamping assembly;

S3. The weldment is delivered to the top of the base, and the first clamping component and the second clamping component move together to clamp the weldment;

S4. The visual detector corresponds to the weld seam, and photographs, marks and stores data;

S5. The first clamping component and the second clamping component move in reverse to make the weldment return to the support seat;

S6. The weldments are moved and transmitted to the material distribution mechanism, and the system sends signals to the material distribution mechanism to classify the weldments and transmit them to the second conveyor belt;

S7. After being transported to the second conveyor belt for classification, the manipulator stacks the weldments sequentially;

S8. The positioning signal inside the support base is sent to the terminal device;

S9. The user searches for the position of the weldment in real time through the terminal device.

In a further embodiment, the "defect detection analysis" in S4 includes the following steps:

S1. After the computer receives the image, it scans and compares the image to detect the defect outline in the welding image;

S2. The computer marks the defect, manually checks whether there is an error in the mark, and re-marks;

S3. The computer recalculates the outline of the modified mark, and stores it in the comparison library.

Beneficial effect

The invention discloses a weldment quality inspection device and a detection method based on the Internet of Things, including three parts: a detection device, a feeding assembly and a material management device, wherein the supporting seat in the feeding assembly is provided with a positioning system, and a welding pipe fitting corresponds to A support seat, through the Internet of Things, real-time positioning of the weldment to be detected, and sends a positioning signal to the terminal equipment, so that workers can find the position of the weldment at any time, and the weldment passes through the detection device with a multi-directional visual inspection system, so as to identify and take pictures. Store the data, automatically identify and judge whether there are defects in the welded pipe fittings through the visual inspection system, and upload the photos to the database. The terminal equipment is connected to the database, which can effectively ensure that workers monitor the weldments at any time. The welded pipe fittings are classified, and the robot stacks and stores the inspected weldments in an orderly manner. Since the weldments are always placed in the support seat, the location is sent in real time, which is more convenient for manual search at any time.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of the detection device in the present invention.

Fig. 3 is a schematic structural diagram of the material management device in the present invention.

Fig. 4 is a schematic structural view of the support seat in the present invention.

FIG. 5 is a schematic structural diagram of the clamping assembly in FIG. 2 .

Fig. 6 is a schematic structural view of the material distributing mechanism in Fig. 3 .

FIG. 7 is a schematic diagram of the internal structure of FIG. 6 .

The reference signs in the figure are: first conveyor belt 1, detection device 2, material management device 3, bottom plate 101, support member 102, splint 103, workbench 201, base 202, first visual detector 203, second visual detector Detector 204, first clamping assembly 205, slide rail 205a, lifting block 205b, suction cup 205c, transition plate 205d, positioning block 205e, compression rod 205f, second clamping assembly 206, first guide rod 207, connecting block 207a , Limiting block 207b, second guide rod 208, third visual detector 209, second conveyor belt 301, bracket 302, material distribution mechanism 303, displacement seat 303a, moving block 303b, chute 303c, slider 303d.

Embodiments of the present invention

In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention.

As shown in Figures 1 to 7, the present invention discloses a weldment quality inspection device and its inspection method based on the Internet of Things, including a feeding assembly, a inspection device 2, and a material management device 3. After the weldment is transferred to the detection device 2 through the feeding assembly, the weldment is classified by the material management device 3 after the detection of the weldment is completed. Among them, the feeding assembly includes the first conveyor belt 1 for transmission, and the support seat placed on the first conveyor belt 1. The traditional support seat cannot position the weldment in real time. The support seat in the present invention is provided with a locator inside , when the weldment is placed in the support seat, the position of the weldment can be monitored at any time, and a signal is sent to the terminal device. The worker can monitor the position of the weldment in real time through the terminal device, so that it is convenient to find the welding machine at any time. The support seat is supported by a base plate 101, and a plurality of splints 103 are fixedly installed on the top of the base plate 101 along the long direction of the base plate 101. The supports 102 all have elastic properties, the splint 103 is made of elastic alloy shrapnel, and the support 102 is fixed in the middle of the support 102 with an elastic rubber piece. When the weldment is placed in the support seat, the splint 103 is squeezed by the weldment. Push away from the periphery of the weldment and clamp the weldment. The support 102 at the bottom of the splint 103 supports the weldment and has a buffering effect when the weldment is placed to prevent the splint 103 from being damaged by the weight of the weldment. The splint 103 and The supports 102 are used in combination, and a plurality of such combinations are evenly distributed on the bottom plate 101. Multiple contact points effectively disperse the pressure of the weldment on the splint 103, reduce the damage of the weldment to the splint 103, and improve the service life of the support seat , and the weldment can be stably placed in the splint 103 .

The welded pipe fittings are stably placed by the support seat, and are transported to the detection device 2 under the action of the first conveyor belt 1. The detection device 2 includes a workbench 201 perpendicular to the first conveyor belt 1, and the workbench 201 is slidably connected The first clamping assembly 205, the visual detection assembly movably connected with the first clamping assembly 205, and the second clamping assembly 206 fixed on one side of the visual detection assembly, the visual detection assembly includes a base 202, the The guide rods at both ends of the base 202 are oppositely arranged, and a plurality of visual detectors are respectively arranged oppositely along the vertical direction and the horizontal direction of the guide rods. In order to avoid affecting the movement of the weldment, the guide rods and the workbench 201 move through the slide rail 205a When the weldment moves to the top of the workbench 201, moving the second guide rod 208 can leave enough space for the weldment to move to the workbench 201. The guide rod is divided into the first guide rod 207 and the second guide rod 207 through the base 202. Guide rod 208, the first guide rod 207 is fixedly installed with base 202, the first guide rod 207 is movably connected with the first visual detector 203, and is movably connected with the second visual detector 204 through the connection block 207a, the second visual detector 204 and the first visual detector 203 are vertically arranged in space, and the second guide rod 208 is movably connected with a third visual detector 209, and the third visual detector 209 is arranged opposite to the first visual detector 203 to form a detection area, which is To prevent the visual detector from moving away from the guide rod, the end of the guide rod is fixedly connected to the limit block 207b to control the movement of the visual detector along the predetermined stroke range, and the base 202 is also slid to be provided with a visual detector, thereby ensuring that the visual detector moves along the welding line. It is set in four directions around the workpiece, and the multi-directional visual detector simultaneously shoots the welds in different directions of the weldment, avoiding the omission of photography, and effectively ensuring the accuracy of weldment defects, thereby effectively improving work efficiency. Due to the uncertainty of the size of the workpiece, the position of the weld often changes, and the camera angle is not appropriate, it is easy to cause missed inspections, and the traditional visual detector cannot achieve simultaneous shooting from multiple angles. The first, second, and third visual inspections in the present invention The detectors are all movably connected, and the visual detectors on the base 202 are slidably connected to the workbench 201. All the visual detectors can be moved in a predetermined direction to adjust the visual detectors to correspond to the positions of the welds, which can effectively photograph different Azimuth weld pictures, the visual detector effectively detects the defect position, shape and size in the weld, and analyzes the pictures through the system, stores them in numbers, transmits the pictures to the database, and workers can enter through the terminal equipment The database, inputting the relevant information of the weldment can provide workers with an intuitive and efficient view of weld defects and judge weldment defects.

The weldment needs to be kept in a suspended state during the inspection process. During the traditional weldment inspection, the lifting function of the weldment is realized by moving the clamping component during the welding workpiece clamping process. It is necessary to maintain a certain clamping force on the weldment, otherwise the During the movement of the weldment, the weldment shakes, which easily leads to a decrease in the clamping effect, so that the tilt of the weldment affects the detection results. The clamping components arranged symmetrically on both sides of the base 202 in the present invention effectively ensure the stable clamping of the weldment. The clamping components are respectively arranged on both sides of the visual inspection component, and are divided into a first clamping component 205 movably connected on the workbench 201, and a second clamping component 205 opposite to the first clamping component 205 and movably connected on the workbench 201. The clamping assembly 206, the first clamping assembly 205 and the second clamping assembly 206 have the same structure, both include a transition plate 205d vertically connected to the workbench 201, one side of the transition plate 205d is fixedly connected with a plurality of telescopic components , there are at least three telescopic components, respectively arranged along the periphery of the transition plate 205d, and a lifting block 205b that is slidably connected along one side of the transition plate 205d at a predetermined distance, and the lifting block 205b is set opposite to one of the telescopic components to support the end of the weldment . The cross-section of the lifting block 205b is L-shaped, and the two ends realize the lifting movement through the pulley and the slide rail 205a provided on one side of the transition plate 205d. The lifting block 205b can be used to adjust the height of the weldment so that it is separated from the support seat, thereby avoiding The occlusion under the weldment affects the detection accuracy. The telescopic assembly includes a positioning block 205e distributed along the edge of the transition plate 205d, a telescopic rod vertically and movably connected to the positioning block 205e, and a suction cup 205c is fixedly arranged at one end of the telescopic rod. After the lifting block 205b lifts the weldment to the predetermined position, the suction cup 205c is driven to clamp the weldment through the rotation of the telescopic rod, and the suction cup 205c is used to vacuum fix the weldment at one end of the telescopic rod, which effectively reduces the need for welding parts during the clamping process. Superficial damage. The weldment is first moved to a predetermined height by the lifting block, and then clamped by the clamping assembly, which effectively avoids the stability of the weldment movement from affecting the inspection result of the weldment, and the telescopic assembly is arranged in three directions along the periphery of the transition plate 205d, When clamping the weldment, it can play the role of automatic centering. The clamping components arranged in pairs can effectively ensure that the two ends of the weldment are coaxial, so as to ensure that they are level with the weld when shooting, reduce system judgment errors and ensure more accurate judgments when subsequent workers view pictures.

After the inspection, the workers add marks on the weldments. The workers need to check one by one, check the marks, and make statistics on the relevant data. However, due to the inconvenient handling of the weldments, they are often stacked randomly. Although there are statistical data, the workers will check them before checking It is necessary to check one by one to find the weldments, which greatly increases the workload of the workers. The present invention uses the material management device 3 to judge and classify the defects of the weldments after the weldments are inspected, which is convenient for the defect-free weldments for immediate follow-up. The material management device 3 includes a second conveyor belt 301 fixed on the other side of the workbench 201, and a distributing mechanism 303 arranged opposite to the starting end of the second conveyor belt 301, and the second conveyor belt 301 is symmetrical Arranged on both sides of the material distribution mechanism 303, the symmetrically arranged second conveyor belt 301 respectively transfers the weldments to the storage area to achieve a classification effect, and the placement of the weldments in different areas effectively reduces the time for manually searching for the weldments. 303 is rotatably connected to the bracket 302, including a moving block 303b that moves longitudinally along the bracket 302, and a displacement seat 303a that is slidably connected with the moving block 303b, and the displacement seat 303a moves linearly along the moving block 303b to form a component material area. The moving block 303b is provided with threads along the corners to connect with the screw rod of the bracket 302, and the screw rod is rotated inside the bracket 302 at the same time, and the material distribution mechanism 303 can automatically adjust the height. Can be hidden, so that the second transmission belt 301 is close and moves synchronously, and the transmission in the same direction can be realized. The middle part of the moving block 303b is provided with a chute 303c, which forms a sliding connection with the sliding block 303d on the displacement seat 303a, and the sliding block 303d is connected with the displacement The components are threaded, and the position between the displacement seat 303a and the displacement block can be adjusted according to the weight of the weldment, so as to ensure a smooth displacement process. The displacement seat 303a is located in the middle of the chute 303c inside the moving block 303b by default, and is used to receive the weldment that has been inspected, and receive the movement signal sent by the system, and the displacement seat 303a is driven by the slider 303d to move inside the chute 303c to transfer the weldment To the starting position of the second conveyor belt 301, the manipulator on the side of the second conveyor belt 301 stacks the sorted weldments in an orderly manner, and the workers track the weldments in real time through the terminal equipment to check the inspection progress, effectively improving the workers' search. Weldment efficiency.

Based on the above technical solution, the present invention provides a detection method of a weldment quality detection system based on the Internet of Things, and the specific work is as follows:

Place the weldment in the middle of the support seat and on the first conveyor belt 1; when the motor is energized, the first conveyor belt 1 rotates to transport the weldment to the top of the workbench 201, and at the same time the second guide rod 208 moves to the top of the workbench 201. On one side, when the weldment is delivered to the top of the workbench 201, the first conveyor belt 1 stops rotating, and the clamping assembly cooperates with the movement to clamp the weldment. The lifting block 205b on the clamping assembly corresponds to the end of the welded pipe and rotates at the same time The compression rod 205f presses the suction cup 205c at the end of the compression rod 205f against the surface of the weldment, and the lifting block 205b moves upward, so that the weldment is separated from the support seat and positioned above the workbench 201, and the visual inspection is adjusted while the position of the weldment remains unchanged. The visual detectors correspond to the welds respectively. The visual detectors take pictures of the weld positions through the system control, analyze the pictures through the system, compare and judge the defects, store the data, and send the results to the material distribution mechanism 303 at the same time , and mark the position of the defect, the system will store the relevant data in the database, after the inspection is completed, the clamping assembly reversely adjusts the compression rod 205f to loosen the weldment, and the lifting block 205b moves down to the lowest end, The weldment falls into the support seat again, and the first conveyor belt 1 continues to rotate, driving the weldment to be transported to the material distribution mechanism 303, and the moving block 303b on the material distribution mechanism 303 is turned and lifted, so that the displacement seat 303a is in contact with the base plate 101, and the displacement seat 303a performs displacement according to the signal sent by the system, and transmits the weldment to the corresponding second conveyor belt. The manipulator on the side of the second conveyor belt 301 stacks the weldment sequentially, and the positioning signal inside the support seat is updated in real time Send it to the terminal device, and the user can find the position of the weldment in real time through the terminal device.

In addition, traditional visual detectors can identify simple weldment appearance defects, but because some defects with special shapes are difficult to accurately identify, visual detectors need to summarize and analyze defect recognition experience to improve the reasoning rules for defect recognition. The visual detector takes pictures and stores them in the defect analysis system, marks the defect parts through system comparison, manually corrects the system marks, the system recalculates the corrected pictures and counts them into the comparison library, and automatically accumulates weldments of different shapes Defect shape reduces recognition errors.

As stated above, while the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A weldment quality inspection device based on the Internet of Things, characterized in that it includes:

   The detection device includes a workbench, a first clamping assembly slidably connected to the workbench, a visual inspection assembly movably connected to one side of the first clamping assembly, and a visual inspection assembly fixed to one side of the visual inspection assembly. a second clamping component;

   The feeding assembly includes a first conveyor belt fixed on one side of the workbench, and a support seat for positioning the weldment, and the support seat runs through the conveyor belt;

   The material management device includes a second conveyor belt fixed on the other side of the workbench, and a material distribution mechanism arranged parallel to the starting end of the second conveyor belt, and the second conveyor belt is symmetrically arranged on both sides of the material distribution mechanism. side.
2. A weldment quality inspection device based on the Internet of Things according to claim 1, characterized in that: the visual inspection component includes a base, guide rods arranged at opposite ends of the base, and vertical Orientation and multiple vision detectors set horizontally.
3. The weldment quality inspection device based on the Internet of Things according to claim 2, wherein one side of the base is slidably connected to the workbench along the transverse direction, and a visual detector is slidably connected to the other side along the longitudinal direction.
4. A weldment quality inspection device based on the Internet of Things according to claim 2, wherein the guide rod includes a first guide rod fixedly installed along one end of the base, and a second guide rod movably connected at the other end , one end of the first guide rod is movably connected with a first visual detector, and the other end is vertically movable with the first visual detector through a connecting block to be provided with a second visual detector, and the second guide rod is movably connected with a The third visual detector is arranged horizontally with the first visual detector to form a detection area.
5. A weldment quality inspection device based on the Internet of Things according to claim 1, characterized in that: the first clamping assembly and the second clamping assembly both include a transition plate vertically connected to the workbench, multiple A telescopic assembly vertically fixedly connected to one side of the transition plate, and a lifting block slidingly connected along one side of the transition plate at a predetermined distance.
6. A weldment quality inspection device based on the Internet of Things according to claim 5, wherein the telescopic assembly includes a positioning block distributed along the edge of the transition plate, and a telescopic block vertically and movably connected to the positioning block. A rod, one end of the telescopic rod is fixedly provided with a suction cup.
7. A weldment quality inspection device based on the Internet of Things according to claim 1, characterized in that: the support seat includes a bottom plate, a plurality of splints evenly distributed on the bottom plate, and fixedly arranged in the middle of the splint The support member, the cross-section of the splint is trumpet-shaped and elastic.
8. A weldment quality inspection device based on the Internet of Things according to claim 1, characterized in that: the material distribution mechanism is rotatably connected to the support, including a moving block that moves longitudinally along the support, and is connected with the moving block. The block is slidingly connected with a displacement seat, and the displacement seat moves along a straight line inside the moving block to form a material distribution area.
9. A detection method of a weldment quality detection device based on the Internet of Things is characterized in that it comprises the following steps:

   S1. Place the weldment in the support seat and place it on the first conveyor belt;

   S2, the motor is energized, and the second guide rod moves to the side of the base to approach the clamping assembly;

   S3. The weldment is delivered to the top of the base, and the first clamping component and the second clamping component move together to clamp the weldment;

   S4. The visual detector corresponds to the weld seam, and the computer performs defect detection analysis, marking and storage of data on the picture;

   S5. The first clamping component and the second clamping component move in reverse to make the weldment return to the support seat;

   S6. The weldments are moved and transmitted to the material distribution mechanism, and the system sends signals to the material distribution mechanism to classify the weldments and transmit them to the second conveyor belt;

   S7. After being transported to the second conveyor belt for classification, the manipulator stacks the weldments sequentially;

   S8. The positioning signal inside the support base is sent to the terminal device;

   S9. The user searches for the position of the weldment in real time through the terminal device.
10. According to the detection method of a weldment quality detection device based on the Internet of Things described in claim 9, it is characterized in that the "defect detection analysis" in the S4 includes the following steps:

    S1. After the computer receives the image, it scans and compares the image to detect the defect outline in the welding image;

    S2. The computer marks the defect, manually checks whether there is an error in the mark, and re-marks;

    S3. The computer modifies and recalculates the contour of the mark, and stores it in the comparison library.