A visual inspection apparatus for defects of a boiler metal raw material

Abstract

The present application relates to the technical field of defect detection, in particular to a kind of defect visual detection equipment for boiler metal raw material, including visual detection machine, the upper end of visual detection machine is fixedly installed with cross bar, the outer surface of cross bar is slidably connected with moving assembly, the lower end of moving assembly is fixedly installed with mounting cover, the inside of mounting cover is provided with visual detection mechanism. By utilizing cylinder assembly control piston assembly, the extension and recovery of detection probe are realized, in the lifting process of detection probe, auxiliary linkage assembly automatically opens and closes bottom protection structure, ensures that detection probe is not blocked during detection and is stored and protected when idle, and pressurized gas assists in cleaning the surface of detection probe when recovering, and the piston assembly is ensured to lift smoothly by lubricating mechanism, various functions such as equipment self-adaptive positioning, accurate detection of detection probe, automatic opening and closing of protection structure, auxiliary cleaning of detection probe and lubrication to ensure smoothness are realized, and the efficiency and effect of visual defect detection are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of defect detection, in particular to a defect visual detection equipment for boiler metal raw materials. BACKGROUND

[0002] The boiler metal pipe raw materials may produce cracks, inclusions, pores, surface oxidation and other defects in the production and use process, which directly affect the safety and service life of the boiler. The traditional manual detection has problems of low efficiency, strong subjectivity, high omission rate and the like, and cannot meet the needs of modern industry for high-precision and high-efficiency detection. The automatic detection technology based on machine vision has become the mainstream scheme for defect detection of boiler metal raw materials due to its advantages of non-contact, high speed and high precision.

[0003] In the prior art, a steel pipe inner and outer wall visual detection device with publication number CN218212705U relates to the technical field of steel pipe quality detection. By controlling the rotating motor, the connecting gear is driven to rotate, the meshing between the connecting gear and the driving gear is utilized to drive the steel pipe to rotate, and then the installation of the CCD camera is utilized to continuously scan the rotating steel pipe. The line scan image is sent into the computer program for synthesis processing to obtain the expanded cylindrical surface image, thereby facilitating the visual detection of the steel pipe.

[0004] In order to solve the problem that the traditional steel pipe inner and outer wall visual detection is usually affected by the detection effect of the technical personnel, the above-mentioned document adopts the installation of the CCD camera to continuously scan the rotating steel pipe. However, in the actual use process, the detection camera lacks protective measures, does not have self-adaptive folding and unfolding during detection and idling, and when the traditional detection head detects the stains and defects of the metal pipe, dust is easily adhered to affect the detection effect.

[0005] Therefore, the present application provides a defect visual detection equipment for boiler metal raw materials to solve the problem that the existing detection camera lacks protective measures, does not have self-adaptive folding and unfolding during detection and idling, and when the traditional detection head detects the stains and defects of the metal pipe, dust is easily adhered to affect the detection effect. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application aims to provide a defect visual detection equipment for boiler metal raw materials to solve the problems proposed in the background art.

[0007] In order to achieve the above object, the present application provides the following technical scheme: a kind of boiler metal raw material flaw visual inspection equipment, including visual inspection machine, the upper end of the visual inspection machine is fixedly installed with cross bar, the outer surface of the cross bar is slidably connected with moving assembly, the lower end of the moving assembly is fixedly installed with installation cover, the inside of the installation cover is provided with visual inspection mechanism, the visual inspection mechanism includes piston assembly and auxiliary linkage assembly, the bottom of the installation cover is provided with walking guide assembly, the walking guide assembly includes sealing plate and guide wheel group, the piston assembly includes operation cylinder one, working cylinder two, piston plate and piston rod, the lower end of the piston rod is provided with accommodating groove, the inside of the accommodating groove is provided with detection probe, the auxiliary linkage assembly is arranged on the outside of detection probe.

[0008] Preferably, the two sides of the operation cylinder one are respectively provided with cylinder assembly one and cylinder assembly two, the upper side of the cylinder assembly one and the cylinder assembly two is fixedly connected with top side inlet pipe which is connected with the inner wall of the upper end of operation cylinder one, the lower side of the cylinder assembly one and the cylinder assembly two is fixedly connected with bottom side inlet pipe which is connected with the inner wall of the lower end of operation cylinder.

[0009] Preferably, the outer surface of the piston plate is slidably connected with the inner wall of the operation cylinder one, the lower inner wall of the piston plate is provided with annular groove, the inside of the annular groove is provided with pressure relief part, the pressure relief part includes annular elastic block and embedded ring plate, the upper end of the annular groove is provided with buffer groove, the upper end of the annular elastic block is fixedly connected with the inner cavity top surface of the buffer groove, the half cross section of the annular elastic block is in "U" shape structure, the lower end of the annular elastic block is fixedly connected with the upper surface of the embedded ring plate, the outer surface of the embedded ring plate is movably connected with the inner wall of the annular groove.

[0010] Preferably, the inner wall of the piston plate and the piston rod is provided with pressure transmission groove, the pressure transmission groove is combined by curved groove and straight groove.

[0011] Preferably, the auxiliary linkage assembly includes reinforcing arm plate, the reinforcing arm plate is provided with multiple groups and is circularly arranged about the central axis of the piston rod, the inner wall of the reinforcing arm plate is respectively provided with limiting groove.

[0012] Preferably, the outer side of the reinforcing arm plate is provided with limiting part and linkage plate part, the limiting part is fixedly installed on the lower end outer surface of the sealing plate, the limiting part includes reinforcing ring plate, the inner ring of the reinforcing ring plate is fixedly installed with limiting track, the reinforcing ring plate and the limiting track are integrally formed structure.

[0013] Preferably, the linkage plate part includes movable guard plate, the movable guard plate is combined by L-shaped plate and triangular plate, the outer surface of the L-shaped plate is slidably connected with the inner surface of the limiting track, the inner side of the L-shaped plate is fixedly installed with limiting slide rod, the outer surface of the limiting slide rod is movably connected with the inner wall of the limiting groove.

[0014] Preferably, the lower end of the working barrel two is fixedly provided with an embedded block, the embedded block is matched with an embedded groove fixedly arranged on the inner wall of the sealing plate, the inner side of the working barrel two is fixedly provided with an inner protection barrel, the inner wall of the inner protection barrel is uniformly provided with a ball groove, and the ball groove is movably connected with a ball.

[0015] Preferably, an annular lubricating cavity is formed between the working barrel two and the inner protection barrel, an annular rubber plate is fixedly arranged in the annular lubricating cavity, an extrusion touch rod is fixedly arranged on the inner side of the annular rubber plate, the inner side of the extrusion touch rod is provided with extrusion cotton, and the inner side of the extrusion cotton is movably in contact with the ball.

[0016] Preferably, the outer side of the annular rubber plate is provided with an extrusion piece, the extrusion piece comprises an extrusion connecting rod, the upper outer surface of the extrusion connecting rod is movably in contact with the outer surface of the annular rubber plate, and the lower end inner surface of the extrusion connecting rod is fixedly connected with the outer surface of the movable protective plate.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] The boiler metal raw material flaw visual detection equipment provided by the present application realizes the extension and recovery of the detection probe by using the cylinder assembly to control the piston assembly. In the lifting process of the detection probe, the auxiliary linkage assembly automatically opens and closes the bottom protection structure, ensuring that the probe is not blocked during detection and is stored and protected when idle. The pressurized gas assists in cleaning the surface of the probe during recovery. At the same time, the lubricating mechanism ensures smooth lifting of the piston assembly. The equipment realizes self-adaptive positioning, accurate detection of the detection probe, automatic opening and closing of the protection structure, auxiliary cleaning of the probe, and smooth lubrication, etc. The efficiency and effect of visual flaw detection are improved, and the service life of the equipment is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a three-dimensional structure schematic diagram of the present application;

[0020] Figure 2 It is a front structure schematic diagram of the present application;

[0021] Figure 3 It is a connection structure schematic diagram of the moving assembly and the mounting cover of the present application;

[0022] Figure 4 It is a bottom connection structure schematic diagram of the mounting cover and the walking guide assembly of the present application;

[0023] Figure 5 It is a half-section structure schematic diagram of the present application; Figure 4

[0024] Figure 6 ​An enlarged structural schematic view of A of the present application Figure 5 An enlarged structural schematic view of A of the present application

[0025] Figure 7 An enlarged structural schematic view of B of the present application Figure 5 An enlarged structural schematic view of B of the present application

[0026] Figure 8 An enlarged structural schematic view of B1 of the present application Figure 7 An enlarged structural schematic view of B1 of the present application

[0027] Figure 9 An enlarged structural schematic view of B2 of the present application Figure 7 An enlarged structural schematic view of B2 of the present application

[0028] Figure 10 An enlarged structural schematic view of the connection section of the piston assembly and the auxiliary linkage assembly of the present application

[0029] Figure 11 An enlarged structural schematic view of C of the present application Figure 10 An enlarged structural schematic view of C of the present application

[0030] Figure 12 An exploded structural schematic view of the piston assembly and the pressure relief piece of the present application

[0031] Figure 13 An enlarged structural schematic view of D of the present application Figure 12 An enlarged structural schematic view of D of the present application

[0032] Figure 14 A bottom structural schematic view of the piston assembly and the auxiliary linkage assembly of the present application

[0033] Figure 15 A connection structural schematic view of the linkage plate and the limiting piece of the present application

[0034] In the figure: 1, visual detection machine; 11, horizontal rod; 12, moving assembly; 2, mounting cover; 3, walking guide assembly; 31, sealing plate; 310, sliding groove; 210, limiting vertical rod; 21, operation cylinder one; 211, working cylinder two; 212, annular rubber plate; 2121, extrusion touch rod; 213, extruded cotton; 214, inner protection cylinder; 2140, reserved groove; 22, cylinder assembly one; 23, cylinder assembly two; 221, top side inlet pipe; 222, bottom side inlet pipe; 24, piston plate; 241, piston rod; 25, center line pipe; 240, annular groove; 2401, buffer groove; 2402, embedded ring plate; 2403, annular elastic block; 2400, pressure transmission groove; 2420, containing groove; 242, detection probe; 26, reinforcing arm plate; 260, limiting groove; 27, reinforcing ring plate; 271, limiting track; 28, movable guard plate; 281, limiting sliding rod; 29, extrusion connecting rod. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme of the present application, and the advantages are clearer, more complete and clearer, the following will be further described in detail with the help of the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present application, rather than all the embodiments. They are used to explain the embodiments of the present application, and are not used to limit the embodiments of the present application. All other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] Embodiment one, please refer to Figures 1-15 The present application provides a technical scheme: a kind of boiler metal raw material flaw visual inspection equipment, including visual inspection machine 1, the upper end of visual inspection machine 1 is fixedly installed with cross bar 11, the outer surface of cross bar 11 is slidably connected with moving assembly 12, the lower end of moving assembly 12 is fixedly installed with installation cover 2, the inside of installation cover 2 is provided with visual inspection mechanism, visual inspection mechanism includes piston assembly and auxiliary linkage assembly, the bottom of installation cover 2 is provided with walking guide assembly 3, walking guide assembly 3 includes sealing plate 31 and guide wheel group, piston assembly includes operation cylinder one 21, working cylinder two 211, piston plate 24 and piston rod 241, the lower end of piston rod 241 is provided with containing groove 2420, the inside of containing groove 2420 is provided with detection probe 242, auxiliary linkage assembly is arranged on the outside of detection probe 242;The upper end of operation cylinder one 21 is fixedly connected with the inner cavity top surface of installation cover 2, the inner cavity top surface of operation cylinder one 21 is fixedly installed with limiting vertical rod 210, the inner side of limiting vertical rod 210 is movably connected with center line pipe 25, center line pipe 25 penetrates the center inner wall of piston plate 24 and piston rod 241, and the inside of center line pipe 25 is provided with flexible pipe, flexible pipe is electrically connected with detection probe 242, the bottom of center line pipe 25 is fixedly connected with the upper end of detection probe 242 by joint;The two sides of operation cylinder one 21 are provided with cylinder assembly one 22 and cylinder assembly two 23 respectively, the upper side of cylinder assembly one 22 and cylinder assembly two 23 is fixedly connected with top side inlet pipe 221, which is connected with the upper end inner wall of operation cylinder one 21, the lower side of cylinder assembly one 22 and cylinder assembly two 23 is fixedly connected with bottom side inlet pipe 222, which is connected with the lower end inner wall of operation cylinder one 21, the inner side wall of top side inlet pipe 221 and bottom side inlet pipe 222 is provided with solenoid valve;

[0037] In the embodiment, the horizontal direction and the vertical direction of the mounting cover 2 and the walking guide assembly 3 are adaptively moved by the movement of the moving assembly 12, so as to detect the defects of the boiler metal pipe fittings master batch placed on the visual detection machine 1. When the guide wheel set of the walking guide assembly 3 is in contact with the surface of the pipe fitting, the vertical height of the detection probe 242 is changed to ensure that the detection probe 242 is extended, and the auxiliary linkage assembly is removed to shield the bottom of the detection probe 242. The auxiliary linkage assembly can also ensure the storage and protection of the detection probe 242 when it is not used, so as to avoid damage.

[0038] Embodiment two, refer to the attached drawings Figures 1-15 On the basis of the first embodiment, in order to realize the detection of the detection probe 242 in use and the storage protection of the detection probe 242 when not in use, the outer surface of the piston plate 24 is in sliding connection with the inner wall of the operating cylinder 21. The lower inner wall of the piston plate 24 is provided with an annular groove 240. The inner side of the annular groove 240 is provided with a pressure relief part. The pressure relief part includes an annular elastic block 2403 and an embedded ring plate 2402. The upper end of the annular groove 240 is provided with a buffer groove 2401. The upper end of the annular elastic block 2403 is fixedly connected with the inner cavity top surface of the buffer groove 2401. The half cross section of the annular elastic block 2403 is in "U" shape structure. The lower end of the annular elastic block 2403 is fixedly connected with the upper surface of the embedded ring plate 2402. The outer surface of the embedded ring plate 2402 is movably connected with the inner wall of the annular groove 240. The piston plate 24 and the inner wall of the piston rod 241 are provided with a pressure conveying groove 2400. The pressure conveying groove 2400 is composed of a curved groove and a straight groove.

[0039] In the embodiment, refer to Figure 5 and Figure 6When the surface of the boiler metal pipe is needed to be detected, the top side pipe inlet 221 of the cylinder assembly 22 and the cylinder assembly 23 is opened, so that the pressurized gas enters the upper cavity of the operating cylinder 21 and the piston plate 24 through the top side pipe inlet 221, at this time, the pressurized gas fills the inner cavity of the operating cylinder 21, and pushes the piston plate 24 downward, at this time, the piston plate 24 drives the piston rod 241 and the detection probe 242 connected at the bottom to move downward synchronously; in addition, when the flaw detection is completed, the detection probe 242 is recovered, at this time, the bottom side pipe inlet 222 is controlled to be opened, the pressurized gas enters the lower cavity of the piston plate 24 and the operating cylinder 21, under the continuous input of the pressurized gas, the piston plate 24 is pushed upward, and after the piston plate 24 rises to a position where it can no longer rise, the pressurized gas fills the lower cavity of the operating cylinder 21 and pushes the embedded ring plate 2402 upward, at this time, the annular elastic block 2403 is compressed by the embedded ring plate 2402, and at this time, the bottom position of the annular groove 240 avoids the input port of the pressure transmission groove 2400, so that the channel of the pressure transmission groove 2400 is opened, at this time, part of the pressurized gas enters the straight groove through the input port of the curved groove and is finally sprayed out through the output end of the straight groove. Through such a design, not only can the piston rod 241 be lifted and lowered, but also the detection probe 242 can be cleaned after detection and recovery, so as to avoid the accumulation of impurities on the surface of the detection probe 242 and affect the detection effect in the next detection, and the maintenance burden can be reduced.

[0040] In this embodiment, reference is made to Figures 1-15 In order to realize the opening and closing of the bottom protection structure of the detection probe 242 when the piston assembly is lifted and lowered, on the basis of the second embodiment, the auxiliary linkage assembly comprises a reinforcing arm plate 26, the reinforcing arm plate 26 is arranged in a circular array about the central axis of the piston rod 241, and a limiting groove 260 is formed in the inner wall of the reinforcing arm plate 26; a limiting piece and a linkage plate piece are arranged on the outer side of the reinforcing arm plate 26, the limiting piece is fixedly installed on the lower end outer surface of the sealing plate 31, the limiting piece comprises a reinforcing ring plate 27, the inner ring of the reinforcing ring plate 27 is fixedly installed with a limiting track 271, and the reinforcing ring plate 27 and the limiting track 271 are an integral molding structure; the linkage plate piece comprises a movable guard plate 28, the movable guard plate 28 is combined by an L-shaped plate and a triangular plate, the outer surface of the L-shaped plate is in sliding connection with the inner surface of the limiting track 271, the inner side of the L-shaped plate is fixedly installed with a limiting slide rod 281, and the outer surface of the limiting slide rod 281 is in movable connection with the inner wall of the limiting groove 260;

[0041] In this embodiment, reference is made to Figures 7-8As shown, during the lifting and lowering of the piston rod 241, the reinforcing arm plate 26 connected to its lower end moves synchronously. At this time, in conjunction with the dual limiting effect of the limiting rail 271 and the limiting groove 260, when the reinforcing arm plate 26 moves longitudinally, the limiting slide rod 281 moves inside the limiting groove 260, and at this time, the movable guard plate 28 moves horizontally along the limiting rail 271. Specifically, when the reinforcing arm plate 26 rises, multiple sets of movable guard plates 28 move inward synchronously, and the triangular plate at the bottom forms an obstruction and blockage of the detection probe 242. When the reinforcing arm plate 26 falls, multiple sets of movable guard plates 28 expand outward synchronously, releasing the obstruction of the bottom of the detection probe 242. It is worth noting that the multiple sets of reinforcing arm plates 26 not only meet the triggering of the linkage plate, but also provide protection for the detection probe 242, avoiding accidental damage to the detection probe 242 during defect detection and extending its service life.

[0042] Example 4, see attached document Figures 1-15 Based on Embodiment 3, in order to achieve smooth lifting and lowering of the piston assembly and ensure the efficiency of the detection probe 242 during detection: A block is fixedly installed on the lower outer surface of the working cylinder 211, and the block is respectively fitted into a groove fixedly installed on the inner wall of the sealing plate 31. An inner protective cylinder 214 is fixedly installed on the inner circumferential surface of the working cylinder 211. Ball grooves are evenly opened on the inner wall of the inner protective cylinder 214, and balls are movably connected inside the ball grooves. A reserved groove 2140 is opened on the lower inner wall of the inner protective cylinder 214, and the inner surface of the reserved groove 2140 is movably connected to the outer surface of the reinforcing arm plate 26. This inner protective cylinder 214 can serve as a limiting component for the lifting and lowering of the piston rod 241, and can also provide lubrication for the lifting and lowering of the piston rod 241. In addition, through the opening of the reserved groove 2140, which is adapted to multiple sets of reinforcing arm plates 26, it can serve as a reinforcement when the detection probe 242 is retracted. The arm plate 26 is stowed, while ensuring the limiting effect when the arm plate 26 moves; an annular lubrication cavity is formed between the working cylinder 211 and the inner protective cylinder 214, and an annular rubber plate 212 is fixedly installed inside the annular lubrication cavity. A pressing contact rod 2121 is fixedly installed on the inner annular surface of the annular rubber plate 212, and a pressing cotton 213 is provided on the inner side of the pressing contact rod 2121. The inner annular surface of the pressing cotton 213 abuts against the ball bearings; the outer annular surface of the annular rubber plate 212... The surface is provided with an extrusion component, which includes an extrusion connecting rod 29. The upper outer surface of the extrusion connecting rod 29 is in movable contact with the outer surface of the annular rubber plate 212, and the lower inner surface of the extrusion connecting rod 29 is fixedly connected to the outer surface of the movable guard plate 28. A second sliding groove is provided on the lower inner wall of the working cylinder 211, and a sliding groove 310 adapted to the second sliding groove is provided on the lower inner wall of the sealing plate 31. The inner walls of the sliding groove 310 and the second sliding groove are slidably connected to the outer surface of the extrusion connecting rod 29.

[0043] In the embodiment, in the process of implementing the lifting activity of the piston assembly, not only the opening and closing of the protection structure of the detection probe 242 can be realized, but also the lubrication of the side wall of the piston rod 241 can be simultaneously satisfied. Figures 7-8 As shown, the working barrel two 211 and the inner protection barrel 214 form a lubricating cavity, when the movable arm plate 28 is moved inward by the moving of the reinforcing arm plate 26, at this time, the connecting rod 29 is synchronously moved inward, and the annular rubber plate 212 is extruded, at this time, the extrusion touch rod 2121 inside the annular rubber plate 212 extrudes the extrusion cotton 213 inward, it should be noted that the extrusion cotton 213 is saturated with lubricating oil, and when extruded by external force, the lubricating oil is extruded and contacted with the ball, the ball is lubricated, further ensuring the smoothness of the piston rod 241 during movement, so that one mechanism realizes multiple effects.

[0044] Embodiment five, referring to the attached Figures 1-15 On the basis of the fourth embodiment, the application further provides a use method of the flaw visual detection equipment for boiler metal raw materials, including the following steps:

[0045] Step one: self-adaptive mobile positioning of the equipment: through the activity of the moving assembly 12, the installation cover 2 and the walking guide assembly 3 are driven to move self-adaptively in the horizontal and vertical directions, so that the guide wheel set of the walking guide assembly 3 is in contact with the surface of the boiler metal pipe to be detected, and the preliminary positioning of the equipment in the detection position is completed;

[0046] Step two: detection probe extension: the top side pipe inlet 221 channel of the cylinder assembly one 22 and the cylinder assembly two 23 is opened, the pressurized gas enters the operating barrel one 21 and the upper cavity position of the piston plate 24 through the top side pipe inlet 221, the piston plate 24 is pushed to move downward, the piston plate 24 drives the piston rod 241 and the detection probe 242 connected at the bottom to move downward synchronously, so that the detection probe is extended to prepare for flaw detection;

[0047] Step three: detection probe bottom protection structure opening and closing and detection: in the process of lifting of the piston rod 241, the reinforcing arm plate 26 connected at the lower end moves synchronously, under the double limiting action of the limiting rail 271 and the limiting groove 260, the movable arm plate 28 moves in the horizontal direction along the limiting rail 271, when the reinforcing arm plate 26 descends, a plurality of movable arm plates 28 synchronously expand outward, and the shielding of the bottom of the detection probe 242 is removed, at this time, the detection probe 242 detects the flaws on the surface of the boiler metal pipe.

[0048] Step four: detection probe recovery and auxiliary cleaning: after the completion of the defect detection, the bottom side inlet pipe 222 channel is opened, the pressurized gas enters the lower cavity of the piston plate 24 and the operation cylinder one 21, the piston plate 24 is pushed upward until it rises to the limit position, at this time the pressurized gas fills the lower cavity of the operation cylinder one 21, the embedded ring plate 2402 is pushed upward, the ring-shaped elastic block 2403 is compressed to generate compression, the bottom position of the annular groove 240 avoids the input port of the pressure transmission groove 2400, part of the pressurized gas enters the straight groove through the input port of the curved groove and is finally sprayed out through the output end of the straight groove, auxiliary cleaning is performed on the recovered detection probe 242 to avoid the accumulation of impurities affecting the subsequent detection effect, at the same time, during the lifting movement of the piston assembly, when the movable guard plate 28 is moved inward by the reinforced arm plate 26, the connecting rod 29 is synchronously pushed inward and extrudes the ring-shaped rubber plate 212, the inner side extrusion touch rod 2121 is extruded inward to fill the extrusion cotton 213, the lubricating oil is extruded and contacted with the ball, the smoothness of the piston rod 241 is ensured during the movement, and the efficiency of the defect detection is further realized.

[0049] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. A kind of boiler metal raw material flaw visual inspection equipment, including visual inspection machine (1), the upper end of visual inspection machine (1) is fixedly installed with crossbar (11), the outer surface of crossbar (11) is slidably connected with moving assembly (12), it is characterized by: The lower end of the mobile assembly (12) is fixedly provided with a mounting cover (2), the inside of the mounting cover (2) is provided with a visual detection mechanism, the visual detection mechanism comprises a piston assembly and an auxiliary linkage assembly, the bottom end of the mounting cover (2) is provided with a walking guide assembly (3), the walking guide assembly (3) comprises a sealing plate (31) and a guide wheel set, the piston assembly comprises an operation cylinder one (21), a working cylinder two (211), a piston plate (24) and a piston rod (241), the lower end of the piston rod (241) is provided with a containing groove (2420), the inner side of the containing groove (2420) is provided with a detection probe (242), the auxiliary linkage assembly is arranged outside the detection probe (242); The outer surface of the piston plate (24) is in sliding connection with the inner wall of the operation cylinder one (21), the lower side inner wall of the piston plate (24) is provided with an annular groove (240), the inner side of the annular groove (240) is provided with a pressure relief piece, the pressure relief piece comprises an annular elastic block (2403) and an embedded ring plate (2402), the upper end of the annular groove (240) is provided with a buffer groove (2401) in a penetrating manner, the upper end of the annular elastic block (2403) is fixedly connected with the inner cavity top surface of the buffer groove (2401), the lower end of the annular elastic block (2403) is fixedly connected with the upper surface of the embedded ring plate (2402), the outer surface of the embedded ring plate (2402) is in movable connection with the inner wall of the annular groove (240); The inner wall of the piston plate (24) and the piston rod (241) is provided with a pressure conveying groove (2400), the pressure conveying groove (2400) is composed of a curved groove and a straight groove; after the flaw detection is completed, the detection probe (242) is recycled, the bottom side inlet pipe (222) channel is controlled to be opened, the pressurized gas enters the lower cavity position of the piston plate (24) and the operation cylinder one (21), under the continuous input of the pressurized gas, the piston plate (24) is pushed upward, until the piston plate (24) rises to a position where it does not rise any more, after the pressurized gas fills the lower cavity position of the operation cylinder one (21), the embedded ring plate (2402) is pushed upward, the annular elastic block (2403) is compressed under the pushing of the embedded ring plate (2402), the bottom position of the annular groove (240) avoids the input port of the pressure conveying groove (2400), the channel of the pressure conveying groove (2400) is opened, at this time, part of the pressurized gas will enter the straight groove through the input port of the curved groove and be finally sprayed out through the output end of the straight groove.

2. The apparatus for visual inspection of defects in a metal feedstock for a boiler as claimed in claim 1, wherein: The two sides of the operation cylinder one (21) are respectively provided with a cylinder assembly one (22) and a cylinder assembly two (23), the upper side of the cylinder assembly one (22) and the cylinder assembly two (23) is fixedly connected with a top side inlet pipe (221) which is in penetrating connection with the inner wall of the upper end of the operation cylinder one (21), the lower side of the cylinder assembly one (22) and the cylinder assembly two (23) is fixedly connected with a bottom side inlet pipe (222) which is in penetrating connection with the inner wall of the lower end of the operation cylinder one (21).

3. The apparatus for visual inspection of defects in a metal feedstock for a boiler as claimed in claim 1, wherein: The half cross section of the annular elastic block (2403) is in "U" shape structure.

4. The apparatus for visual inspection of defects in a metal feedstock for a boiler as claimed in claim 1, wherein: The auxiliary linkage assembly comprises reinforcing arm plates (26) arranged in a circular array about the central axis of the piston rod (241), and a limiting groove (260) is formed in the inner wall of each reinforcing arm plate (26).

5. A visual inspection apparatus for detecting defects in a metal material for a boiler as defined in claim 4, wherein: The outer side of the reinforcing arm plate (26) is provided with a limiting member and a linkage plate member, the limiting member is fixedly installed on the outer surface of the lower end of the sealing plate (31), and the limiting member comprises a reinforcing ring plate (27), the inner ring of the reinforcing ring plate (27) is fixedly installed with a limiting track (271), and the reinforcing ring plate (27) and the limiting track (271) are an integral molding structure.

6. The apparatus for visual inspection of defects in a metal feedstock for a boiler as claimed in claim 5, wherein: The linkage plate member comprises a movable guard plate (28) which is combined by a Z-shaped plate and a triangular plate, the outer surface of the Z-shaped plate is in sliding connection with the inner surface of the limiting track (271), the inner side of the Z-shaped plate is fixedly installed with a limiting slide rod (281), and the outer surface of the limiting slide rod (281) is in movable connection with the inner wall of the limiting groove (260).

7. The apparatus for visual inspection of defects in a metal feedstock for a boiler as claimed in claim 1, wherein: The outer surface of the lower end of the working cylinder two (211) is fixedly installed with an embedded block, the embedded block is adaptively embedded with an embedded groove fixedly installed on the inner wall of the sealing plate (31), the inner side of the working cylinder two (211) is fixedly installed with an inner protective cylinder (214), the inner wall of the inner protective cylinder (214) is uniformly provided with a ball groove, and the inner ball groove is movably connected with a ball.

8. The apparatus for visual inspection of defects in a metal feedstock for a boiler as claimed in claim 7, wherein: An annular lubricating cavity is formed between the working cylinder two (211) and the inner protective cylinder (214), the annular lubricating cavity is fixedly installed with an annular rubber plate (212) inside, the inner side of the annular rubber plate (212) is fixedly installed with an extrusion touch rod (2121), the inner side of the extrusion touch rod (2121) is provided with extrusion cotton (213), and the inner side of the extrusion cotton (213) is in movable abutment with the ball.

9. A visual inspection apparatus for detecting flaws in a metal feedstock for a boiler as defined in claim 8, characterized in that: The outer side of the annular rubber plate (212) is provided with an extrusion member, the extrusion member comprises an extrusion connecting rod (29), the upper outer surface of the extrusion connecting rod (29) is in movable abutment with the outer surface of the annular rubber plate (212), and the lower end inner side surface of the extrusion connecting rod (29) is fixedly connected with the outer surface of the movable guard plate (28).

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