Enamel liner appearance defect detection device and method

Abstract

The invention relates to the technical field of inner container detection, in particular to an enamel inner container appearance defect detection device and method.The enamel inner container appearance defect detection device comprises a working table, an abutting table, a clamping mechanism and a detection mechanism; the distance between the visual sensor and the surface of the inner container is controlled in the mode that the four balls abut against the surface of the inner container at the same time, it is ensured that the visual sensor is perpendicular to the area of a shot detection part, and the problem that the detection quality is affected due to the fact that the perpendicularity and distance deviation between the visual sensor and the area is too large is solved; secondly, the front abutting table and the rear abutting table abut against the inner container from the front side and the rear side of the inner container, so that the inner container is clamped and limited, the axis of the inner container and the set axes of the abutting tables are collinear, the perpendicularity and distance control process is assisted, and the mode that the corresponding balls avoid the protrusion defect is controlled through the distance sensors; the detection distance between the visual detector and the outer surface of the inner container is maintained, and it is ensured that the detection environment of the visual sensor meets the requirement under the condition.

Description

Technical Field

[0001] The present invention relates to the technical field of liner detection, and in particular to a device and method for detecting appearance defects of an enamel liner. Background Art

[0002] The inner tank of the air-energy water heater is one of its core components. It is mainly responsible for storing heated hot water and ensuring the safety of water quality. The inner tank mainly includes enamel inner tank, stainless steel inner tank and crystal inner tank.

[0003] Among them, the enamel liner is a more common type on the market. The enamel liner is made by coating a layer of glass glaze on the metal surface and then sintering it at high temperature. It can effectively resist scale and corrosion and extend the service life. The enamel liner is mainly composed of arc sections on both sides and a cylindrical section in the middle. The cylindrical section is formed by bending a flat plate and then welding it. The arc section and the cylindrical section are also welded together. Therefore, the surface of the liner has a longitudinal seam on the cylindrical section and a circumferential seam between the cylindrical section and the arc section. Figure 7 Secondly, since the outer surface of the inner tank needs to be wrapped around the aluminum alloy heat exchanger, its outer surface cannot have defects such as excessive protrusions, welding slag or depressions, so the outer surface of the inner tank needs to be inspected for defects.

[0004] Currently, inspection is usually carried out through methods such as visual inspection and automatic optical inspection. During the optical inspection process, the inner liner is first clamped and slowly rotated intermittently around its axis. At the same time, the image is captured by a high-resolution camera or visual detector, and the image is analyzed by software algorithm to find defects.

[0005] The following problems exist in the above-mentioned inspection process: after the inner liner is clamped, there is no strict control between the surface of the inner liner and the visual sensor, which can easily lead to deviations in the verticality and distance between the visual sensor and the inner liner surface, making it difficult to obtain the required clear and accurate image. In severe cases, the image will be distorted and it will be difficult to identify defects. Summary of the Invention

[0006] Based on this, it is necessary to provide an enamel liner appearance defect detection device to solve the above-mentioned problems of the prior art.

[0007] The present application provides an enamel liner appearance defect detection device, comprising: a workbench, on which are provided two front and rear opposing bases, the opposite surfaces of the two bases being rotatably provided with a clamping platform, and a clamping mechanism for clamping the liner and making the axis of the liner and the axis of the clamping platform collinear.

[0008] The clamping mechanism includes a supporting part, a workbench is provided with a supporting part for supporting the inner liner before clamping, a rotating column is rotatably provided on the front base, and a plurality of opening plates for circumferentially opening the inner liner are provided on the rotating column.

[0009] The workbench is provided with a track that slides left and right and is at the same height and parallel to the axis of the rotating column. An electric slider is provided on the track that slides back and forth. The electric slider is provided with a detection mechanism for detecting the outer surface of the inner tank.

[0010] The detection mechanism includes a sliding plate. The sliding plate is provided on the electric slider through an adjustment part. The distance between the sliding plate and the outer surface of the inner tank is preliminarily set by the adjustment part. A visual detector is fixedly provided on the right end face of the sliding plate.

[0011] The right end face of the sliding plate is provided with a fitting unit, which includes four balls arranged in a matrix. The four balls are pressed against the inner liner to control the distance and verticality between the visual detector and the inner liner.

[0012] The fitting unit also includes a avoiding portion for allowing the ball to avoid the protrusion on the outer surface of the inner container.

[0013] According to a favorable embodiment, the rear end face of the rotating column is fixedly provided with a clamping pad that fits against the inner wall of the rear arc of the liner. The liner is clamped by the clamping pad and the rear pad pressing against the front and rear inner walls of the rear section of the liner while cooperating with the front and rear pads to press against the liner.

[0014] According to a favorable embodiment, the clamping mechanism also includes a receiving groove, and a receiving groove corresponding to the support plate is opened on the rotating column. A sliding block is provided in the receiving groove for sliding back and forth. The sliding block and the inner wall of the receiving groove are hingedly provided with a hinge bar, and the support plate is hingedly provided between the corresponding two hinge bars.

[0015] According to a favorable embodiment, the clamping mechanism also includes a driving group arranged on the driving column and used to drive the expansion plate to expand. The driving group includes a threaded rod, a threaded rod is coaxially rotated on the rotating column, and a driving ring corresponding to the plate group is provided on the rotating column for sliding back and forth. The driving ring is sleeved on the threaded rod and the two are threadedly matched. All sliding blocks corresponding to the same plate group are fixedly arranged on the corresponding driving ring.

[0016] According to a favorable embodiment, the detection mechanism also includes a telescopic spring column, a telescopic spring column is passed through the electric slider for sliding left and right, the sliding plate is hingedly provided at the telescopic end of the telescopic spring column, and the right end surface of the sliding plate is hingedly provided with four swing frames arranged in a rectangular shape and swinging up and down, the ball bearing is movably provided on the swing frame, and a pressure spring is commonly provided between the two swing frames facing each other up and down.

[0017] A push frame is provided on the workbench for sliding left and right, and the track is fixed on the push frame. When the push frame moves to the leftmost position within its moving range, it is in a working state.

[0018] According to an advantageous embodiment, a connecting frame is fixedly provided between the two front and rear opposite swing frames, and the front and rear swing frames are made to swing synchronously via the connecting frame.

[0019] According to a favorable embodiment, the adjustment portion includes a locking plate, and locking plates are movably installed on the front and rear end surfaces of the electric slider. The two locking plates are locked by bolts, and locking blocks are fixedly provided on the opposite surfaces of the two locking plates. Locking grooves are arranged equidistantly on the left and right sides of the telescopic spring column.

[0020] According to an advantageous embodiment, the avoidance portion comprises a hydraulic cylinder, and the sliding plate is movably provided with two hydraulic cylinders with axes extending from left to right, and the telescopic section of the hydraulic cylinder is located on the left side of the sliding plate and a reference block is fixed thereon.

[0021] The reference block is a right-angled trapezoid with the left side smaller and the right side larger, and the inclined surfaces of the two reference blocks are opposite to each other. The left end face of the connecting frame is fixed with a reference bar corresponding to the inclined surface of the reference block and passing through the sliding plate. The reference bar cooperates with the inclined surface of the corresponding reference block.

[0022] Distance sensors corresponding to the balls are arranged on both the upper and lower sides of the sliding plate.

[0023] When the reference block moves to the maximum position on the left, the reference block limits the swing range of the reference bar to limit the swing angle of the swing frame, thereby controlling the distance between the visual detector and the outer surface of the inner container.

[0024] To sum up, the present invention includes at least one of the following beneficial effects: the present invention controls the distance between the visual sensor and the inner liner surface by simultaneously pressing four balls against the inner liner surface, while ensuring that the visual sensor is perpendicular to the area of ​​the photographed detection part, thereby avoiding the problem of affecting the detection quality due to excessive deviation in verticality and spacing between the two.

[0025] Secondly, the inner liner is clamped and limited by the front and rear two pressing platforms from the front and rear sides, so that the axis of the inner liner is collinear with the set axis of the pressing platform, which assists in controlling the verticality and spacing.

[0026] By controlling the corresponding ball to avoid the protruding defects through the distance sensor, the detection distance between the visual detector and the outer surface of the inner liner is maintained, ensuring that the detection environment of the visual sensor meets the requirements in such situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a device for detecting appearance defects of an enamel liner provided according to an embodiment of the present invention is shown.

[0029] Figure 2 A schematic diagram of a partially cutaway three-dimensional structure of a device for detecting appearance defects of an enamel liner provided according to an embodiment of the present invention is shown.

[0030] Figure 3 A schematic diagram of a partially cutaway three-dimensional structure among a rotating column, a support plate and a threaded rod provided according to an embodiment of the present invention is shown.

[0031] Figure 4 A schematic diagram of the three-dimensional structure among the track, the sliding plate and the swing frame provided according to an embodiment of the present invention is shown.

[0032] Figure 5 A three-dimensional schematic diagram of the swing plate, the visual detector and the reference bar provided according to an embodiment of the present invention is shown.

[0033] Figure 6 A schematic diagram of an exploded three-dimensional structure between a telescopic spring column, a locking plate and a locking block provided according to an embodiment of the present invention is shown.

[0034] Figure 7 A schematic diagram of the three-dimensional structure of an inner container provided according to an embodiment of the present invention is shown.

[0035] : Among them, the above-mentioned drawings include the following figure marks: 1. workbench; 2. base; 20. clamping platform; 21. rotating column; 3. clamping mechanism; 30. supporting part; 300. lifting platform; 31. opening plate; 32. pad; 33. clamping pad; 34. accommodating groove; 340. sliding block; 341. hinge bar; 35. threaded rod; 350. driving ring; 4. track; 40. electric slider; 5. detection mechanism; 50. sliding plate; 52. visual detector; 530. ball; 54. avoidance part; 540. reference block; 541. reference bar; 542. distance sensor; 55. telescopic spring column; 550. swing frame; 551. pressure spring; 552. pushing frame; 553. connecting frame; 56. adjustment part; 560. locking plate; 561. locking block; 562. locking groove. DETAILED DESCRIPTION

[0036] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] like Figure 1 and Figure 2 As shown, a device for detecting appearance defects of an enamel liner is provided, comprising: a workbench 1, on which two front and rear opposing bases 2 are provided, the rear base 2 is fixedly provided on the workbench 1, and the front base 2 is slidably provided on the workbench 1 (the front base 2 is driven by an external hydraulic cylinder to move back and forth, and the external hydraulic cylinder is not shown in the figure), and opposite surfaces of the two bases 2 are rotatably provided with a clamping platform 20, which is driven to rotate by an external motor 1 (not shown in the figure), and a clamping mechanism 3 for clamping the liner and making the axis of the liner and the axis of the clamping platform 20 collinear is provided between the two clamping platforms 20.

[0038] like Figure 1 and Figure 2 As shown, the clamping mechanism 3 includes a supporting portion 30, and the workbench 1 is provided with a supporting portion 30 for supporting the inner liner before clamping and is arranged between the two bases 2. A rotating column 21 with an axis extending from front to rear is rotatably provided on the front base 2, and the front pressing platform 20 is fixedly sleeved on the rotating column 21.

[0039] like Figure 1 and Figure 2 As shown, the supporting part 30 includes a lifting platform 300 arranged on the workbench 1. Two left-right symmetrical supporting rollers for supporting the inner liner are rotatably arranged on the upper side of the lifting platform 300. The lifting platform 300 is driven by hydraulic pressure to move up and down.

[0040] like Figure 3 As shown, the rotating column 21 is provided with two sets of plate groups distributed front and back, and the plate group includes a plurality of circumferentially distributed expansion plates 31 for circumferentially expanding the inner liner. The expansion action of the expansion plates 31 makes the axis of the inner liner and the axis of the clamping shaft collinear.

[0041] like Figure 1 As shown, a track 4 is provided on the workbench 1 for sliding left and right, which is at the same height and parallel to the axis of the rotating column 21. An electric slider 40 is provided on the track 4 for sliding back and forth. The electric slider 40 is provided with a detection mechanism 5 for detecting the circumferential seam, longitudinal seam and surface quality.

[0042] like Figure 1 、 Figure 4 and Figure 5As shown, the detection mechanism 5 includes a sliding plate 50, and the sliding plate 50 is provided on the electric slider 40 through an adjustment part 56. The distance between the sliding plate 50 and the outer surface of the inner tank is preliminarily set by the adjustment part 56, and a visual detector 52 is fixedly provided on the right end face of the sliding plate 50.

[0043] like Figure 1 and Figure 5 As shown, the right end face of the sliding plate 50 is provided with a fitting unit, which includes four balls 530 arranged in a matrix. The four balls 530 are pressed against the inner liner to control the distance and verticality between the visual detector 52 and the inner liner.

[0044] like Figure 1 As shown, the fitting unit further includes a avoiding portion 54 for allowing the ball 530 to avoid the protrusion on the outer surface of the inner container.

[0045] During operation, the supporting part 30 is first raised to the set height, and the inner liner to be tested is manually placed on the supporting part 30 through existing external lifting equipment or conveying equipment, so that the rotating column 21 extends into the inner liner and the support plate 31 is located in the longitudinal section of the inner liner, and the support plate 31 supports the inner liner circumferentially, so that the axis of the inner liner is collinear with the axis of the rotating column 21 and the clamping platform 20, ensuring the detection accuracy in the subsequent detection process. After that, the external hydraulic cylinder works to make the front base 2 drive the clamping platform 20 thereon to move backward, so that the front and rear clamping platforms 20 clamp the inner liner from the front and rear sides of the inner liner. At this point, the inner liner is clamped and limited, and the axis of the inner liner is collinear with the axis of the clamping platform 20.

[0046] Then, the position of the sliding plate 50 is adjusted according to the axial size of the longitudinal section of the inner liner, and the straight-line distance between the visual detector 52 and the outer surface of the inner liner is made to be the detection set distance, and the visual detector 52 is kept perpendicular to the outer surface of the inner liner by making the four balls 530 contact the surface of the inner liner.

[0047] At this point, the outer surface of the inner liner is inspected. The external motor drives the pressing table 20 to rotate synchronously, so that the inner liner rotates synchronously. The visual detector 52 works to photograph the surface of the inner liner. The electric slider 40 moves intermittently at a set distance. The above process is repeated to complete the photographic inspection of the arc segment and longitudinal segment of the inner liner. All photos are analyzed by existing analysis equipment to finally obtain the appearance defect detection results of the outer surface of the inner liner.

[0048] Secondly, it should be additionally explained that when the electric slider 40 moves horizontally to be opposite to the arc-shaped section of the inner liner, the bonding unit is used to maintain the visual detector 52 and the surface of the inner liner detection area in a perpendicular state and the distance between the two is a set value. When there are protrusions or depressions on the outer surface of the inner liner, the avoidance portion 54 allows the ball 530 to avoid them while maintaining the vertical state and detection distance between the visual detector 52 and the inner liner.

[0049] like Figure 1 and Figure 2 As shown, the clamping mechanism 3 also includes a pad 32. The opposite surfaces of the two pressing platforms 20 are fixedly provided with a pad 32 for direct contact with the inner liner. The pad 32 fits with the arc surfaces at both ends of the inner liner. In order to provide sufficient space for detecting the annular seam, the two pressing platforms 20 are both frustum-shaped and symmetrical front to back, and the small diameter ends of the two pressing platforms 20 are opposite.

[0050] It should be noted that the inspection of appearance defects of the enamel liner mainly focuses on the longitudinal seam, circumferential seam and surface quality of the liner, while the surface inspection of the curved surfaces on the front and back sides of the liner can be completed through manual observation. The liner is clamped by contacting the curved surfaces on the front and back sides of the liner to improve the accuracy of the liner clamping.

[0051] like Figure 1 and Figure 2 As shown, in order to press the inner liner tightly at the front and back and avoid the cantilever beam situation of the rotating column 21, the rear end face of the rotating column 21 is fixedly provided with a pressing pad 33 that fits the inner wall of the rear arc of the inner liner. The pressing pad 33 and the rear side pad 32 press against the front and rear inner walls of the rear section of the inner liner, and the inner liner is clamped by cooperating with the front and rear pads 32 to press against the inner liner.

[0052] like Figure 1 、 Figure 2 and Figure 3 As shown, the clamping mechanism 3 also includes a receiving groove 34. The rotating column 21 is provided with a receiving groove 34 corresponding to the expansion plate 31. A sliding block 340 is provided in the receiving groove 34 for sliding back and forth. The sliding block 340 and the inner wall of the receiving groove 34 are hingedly provided with a hinge bar 341. The expansion plate 31 is hinged between the corresponding two hinge bars 341. In the initial state, the hinge bar 341 and the expansion plate 31 are located in the receiving groove 34, which facilitates the rotating column 21 to move into the inner tank.

[0053] like Figure 1 and Figure 3 As shown, the clamping mechanism 3 also includes a driving group arranged on the driving column and used to drive the expansion plate 31 to expand. The driving group includes a threaded rod 35. The threaded rod 35 is coaxially rotated on the rotating column 21. A driving ring 350 corresponding to the plate group is provided on the rotating column 21 for sliding back and forth. The driving ring 350 is sleeved on the threaded rod 35 and the two are threadedly matched. All sliding blocks 340 corresponding to the same plate group are fixed together on the corresponding driving ring 350.

[0054] During operation, in the process of clamping the inner liner, the rotating column 21 drives all the open plates 31 to move into the inner liner. At this time, the inner liner is still located on the supporting portion 30. It should be noted that the threaded rod 35 is manually docked with the external motor 2 by a clamping method. When the threaded rod 35 needs to be rotated, the external motor 2 is docked with the threaded rod 35, and the threaded rod 35 is driven to rotate synchronously by the rotation of the external motor 2 (this driving process is all existing technology, so it is not shown in the figure). At this time, through the rotation of the threaded rod 35 and the connection between the threaded rod 35 and the corresponding two drive rings 350 The driving ring 350 moves backwards, and the driving ring 350 drives all the sliding blocks 340 thereon to move backwards synchronously, so that the sliding blocks 340 make the corresponding expansion plates 31 gradually move away from the rotating column 21 through the hinge bars 341 thereon, that is, all the expansion plates 31 corresponding to the same driving ring 350 expand outward synchronously with the axis of the rotating column 21 as the center, and finally the expansion plates 31 are pressed against the inner surface of the inner liner, and through the synchronous inward expansion action of all the front and rear expansion plates 31, the axis of the inner liner is made collinear with the axis of the rotating column 21 and the pressing platform 20, and then the front and rear clamping process of the inner liner is carried out.

[0055] While determining the axis of the inner liner, the supporting part 30 is separated from the inner liner. After the axis of the inner liner is determined, the external hydraulic cylinder works to make the front base 2 drive the clamping platform 20 thereon to move backward, so that the front and rear clamping platforms 20 clamp the inner liner from the front and rear sides of the inner liner. In this process, the stability of clamping the inner liner is improved by the tight fit between the pad 32 and the outer surface of the arc section of the inner liner. Secondly, the clamping pad 33, the rear arc section of the inner liner and the rear pad 32 are pressed against each other to avoid the cantilever beam situation of the rotating column 21, thereby improving the accuracy of controlling the axis of the inner liner. In summary, the inner liner is clamped in the front and rear directions and circumferentially, and the axis of the inner liner is made collinear with the axes of the clamping platform 20 and the rotating column 21.

[0056] like Figure 1 、 Figure 4 and Figure 5 As shown, the detection mechanism 5 also includes a telescopic spring column 55, and the electric slider 40 slides left and right with the telescopic spring column 55 penetrating therethrough. The sliding plate 50 is hingedly provided at the telescopic end of the telescopic spring column 55, and the right end surface of the sliding plate 50 is hingedly provided with four swing frames 550 arranged in a rectangular shape and swinging up and down. The ball 530 is movably provided on the swing frame 550, and a pressure spring 551 is commonly provided between the two swing frames 550 facing each other up and down.

[0057] like Figure 1As shown, in order to avoid the process of placing the inner liner on the supporting part 30, a pushing frame 552 is provided on the workbench 1 for sliding left and right, and the track 4 is fixed on the pushing frame 552. The pushing frame 552 is driven by an external hydraulic cylinder 2 to move left and right, and when the pushing frame 552 moves to the leftmost position within its moving range, it is in a working state.

[0058] like Figure 4 and Figure 5 As shown, a connecting frame 553 is fixedly provided between the two front and rear opposite swing frames 550, and the front and rear swing frames 550 are synchronously swung by the connecting frame 553. The four balls 530 contact the inner liner surface in a four-point manner so that the visual detector 52 is always kept perpendicular to the inner liner surface. In the process of avoiding the protrusions on the inner liner surface, only the two front and rear opposite balls 530 contact the inner liner at the same time, and the sliding plate 50 can only swing back and forth. Therefore, at this time, the visual detector 52 is still perpendicular to the outer surface of the inner liner.

[0059] like Figure 4 and Figure 6 As shown, the adjustment portion 56 includes a locking plate 560. The front and rear end surfaces of the electric slider 40 are both movably mounted with locking plates 560. The two locking plates 560 are locked by bolts. The opposite surfaces of the two locking plates 560 are fixedly provided with locking blocks 561. The front and rear sides of the telescopic spring column 55 are both provided with locking grooves 562 arranged equidistantly on the left and right. The telescopic spring column 55 is fixed by inserting the front and rear locking blocks 561 into the corresponding locking grooves 562 and tightening the locking plates 560 with bolts.

[0060] After completing the clamping work of the inner liner, the position of the telescopic spring column 55 is manually adjusted according to the radial size of the inner liner, and the locking groove 562 at the corresponding position is opposite to the locking block 561, and then the two locking plates 560 are closed, so that the locking block 561 is inserted into the corresponding locking groove 562 and the two locking plates 560 are bolted. At this point, the distance between the telescopic spring column 55 and the sliding block 340 is locked. In this way, when the swing frame 550 rotates to the set angle and the ball 530 contacts the outer surface of the inner liner, the straight-line distance between the visual sensor and the outer surface of the inner liner is the set required value, thereby avoiding the overall detection effect being affected by the distance between the visual detector 52 and the inner liner being too large or too small.

[0061] Afterwards, the external hydraulic cylinder works to move the track 4 to the right, and the track 4 drives the electric slider 40 to move to the right synchronously. The balls 530 on the swing frame 550 contact the outer surface of the inner tank, and as the track 4 continues to move, the swing frame 550 and the balls 530 continue to rotate. When the track 4 plate moves to the rightmost position within its moving range, the swing frame 550 rotates to the set angle, and the four balls 530 are in close contact with the outer surface of the inner tank. At this time, the straight-line distance between the visual detector 52 and the inner tank is the required detection distance.

[0062] The electric slider 40 drives the visual detector 52 to move intermittently from front to back. At the same time, the external motor drives the inner container to rotate through the pressing platform 20. During the above process, the visual detector 52 performs visual inspection on the outer surface of the inner container.

[0063] It should be noted that during the inspection of the annular seam of the inner liner and the exposed area on the inner liner, the electric slider 40 drives the four balls 530 to move to the junction of the cylindrical section and the arc section of the inner liner, where two of the balls 530 remain in close contact with the cylindrical section of the inner liner. Therefore, at this time, the distance between the visual detector 52 and the annular seam is still the set detection distance. Afterwards, when the four balls 530 all move to the arc surface of the arc section of the inner liner, the elastic force generated by the elastic deformation of the telescopic spring column 55 itself enables the four balls 530 to be in close contact with the arc surface of the inner liner, and maintain the distance between the visual detector 52 and the outer surface of the inner liner within the set detection distance range and maintain the visual detector 52 perpendicular to the detection area, so as to adapt to the detection needs of different positions.

[0064] like Figure 1 、 Figure 4 and Figure 5 As shown, the avoidance portion 54 includes a hydraulic cylinder. Two hydraulic cylinders with axes extending from left to right are movably mounted on the sliding plate 50. The telescopic section of the hydraulic cylinder is located on the left side of the sliding plate 50 and a reference block 540 is fixed thereon.

[0065] The reference block 540 is a right-angled trapezoid with a smaller left side and a larger right side, and the inclined surfaces of the two reference blocks 540 are opposite to each other. The left end face of the connecting frame 553 is fixed with a reference bar 541 corresponding to the inclined surface of the reference block 540 and passing through the sliding plate 50. The reference bar 541 cooperates with the inclined surface of the corresponding reference block 540.

[0066] Distance sensors 542 corresponding to the balls 530 are provided on both the upper and lower sides of the sliding plate 50 .

[0067] When the reference block 540 moves to the left extreme position, the reference block 540 limits the swing range of the reference bar 541 to limit the swing angle of the swing frame 550, thereby controlling the distance between the visual detector 52 and the outer surface of the inner container.

[0068] During operation, as the swing frame 550 drives the ball 530 to fit the inner liner and rotate to the set angle, the swing frame 550 drives the reference bar 541 thereon to rotate continuously. At this time, the reference block 540 is at the leftmost position within its left and right movement range. The reference bar 541 rotates to fit with the corresponding reference block 540, hindering the swing frame 550 from continuing to rotate. During this process, the pressure spring 551 is deformed, and the elastic force generated by the deformation of the pressure spring 551 makes the ball 530 close to the outer surface of the inner liner. The distance between the visual detector 52 and the outer surface of the inner liner is controlled in the above manner.

[0069] It should be additionally explained that after the distance between the visual detector 52 and the outer surface of the inner container is fixed, the distance between the distance sensor 542 and the inner container is relatively fixed.

[0070] Secondly, when there are defects such as depressions or protrusions on the inner liner, when the inner liner is rotating and the ball 530 is about to contact the raised surface, it should be noted that it is rare for all the balls 530 on the upper and lower sides to contact the raised defect at the same time, so this special situation can be ignored. The situation where only one ball 530 on the upper side contacts the raised defect is used as an example for explanation.

[0071] When the ball 530 does not touch the raised surface, the distance sensor 542 detects that the distance between it and the corresponding detection point on the inner tank remains unchanged, and this distance is the reference distance. In the above-mentioned situation that needs to be explained, the distance sensor 542 on the same side as the ball 530 sends a signal and is reflected back by the raised portion of the inner tank surface. The reflected signal is received and analyzed by the detection circuit to obtain the actual distance between the distance sensor 542 and the raised portion of the inner tank surface. Since this distance is less than the set reference distance, it is judged that the ball 530 is about to pass through the raised portion, and the relevant control system in the distance sensor 542 (which is existing technology and will not be described here) works to control the hydraulic cylinder to make it The reference block 540 on the inner container moves to the right, removing the obstruction to the reference bar 541 and allowing the reference bar 541 to swing within the formed angle range. Therefore, when the subsequent ball 530 contacts the raised surface, the two balls 530 corresponding to the front and rear directions and the swing frame 550 adapt to the swing and avoid the raised part. At this time, since the remaining two balls 530 still remain in close contact with the outer surface of the inner container, the detection distance between the visual detector 52 and the outer surface of the inner container can be maintained. In the case of a concave surface, the position of the reference bar 541 is maintained unchanged, and the ball 530 passes directly through the concave area. At this time, the visual detector 52 and the outer surface of the inner container also maintain the required detection distance.

[0072] In addition, the present invention also provides a method for detecting appearance defects of enameled liner, comprising the following steps: S1, placing the liner: first, the supporting part 30 is raised to a set height, and the liner to be tested is manually placed on the supporting part 30 through an existing external lifting device or conveying equipment, so that the rotating column 21 extends into the liner and the support plates 31 are all located in the longitudinal section of the liner.

[0073] S2. Clamping the inner liner: Through the rotation of the threaded rod 35 and the cooperation between the threaded rod 35 and the corresponding two driving rings 350, the driving ring 350 moves backward, that is, all the expansion plates 31 corresponding to the same driving ring 350 are synchronously expanded outward with the axis of the rotating column 21 as the center, and finally the expansion plates 31 are pressed against the inner surface of the inner liner. Through the synchronous inward expansion action of all the front and rear expansion plates 31, the axis of the inner liner is collinear with the axis of the rotating column 21 and the pressing platform 20.

[0074] The operation of the external hydraulic cylinder causes the front base 2 to drive the pressing platform 20 thereon to move backward, so that the front and rear pressing platforms 20 press against the inner liner from the front and rear sides of the inner liner.

[0075] S3. Adjust the spacing and verticality: Manually adjust the position of the telescopic spring column 55 according to the radial size of the inner liner, and lock the telescopic spring column 55 through the locking block 561. The spacing between the telescopic spring column 55 and the sliding block 340 is locked. At this point, the straight-line distance between the visual sensor and the outer surface of the inner liner is the set required value.

[0076] The balls 530 on the swing frame 550 contact the outer surface of the inner container. The swing frame 550 rotates to a set angle, and the four balls 530 are in close contact with the outer surface of the inner container. At this time, the straight-line distance between the visual detector 52 and the inner container is the required detection distance.

[0077] S4. Detect defects: The external motor 1 drives the pressing table 20 to rotate synchronously, and the inner liner rotates synchronously. The visual detector 52 works to take pictures of the inner liner surface. The electric slider 40 moves intermittently a set distance. The above process is repeated to complete the shooting and detection of the arc segment and longitudinal segment of the inner liner. All photos are analyzed by existing analysis equipment to finally obtain the appearance defect detection results of the inner liner outer surface.

[0078] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0079] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature designated as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0080] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0081] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for detecting appearance defects of enamel liner, characterized in that: include: The workbench is provided with two front and rear opposing bases, and the opposing surfaces of the two bases are rotatably provided with abutment platforms, and a clamping mechanism for clamping the inner liner and making the axis of the inner liner and the axis of the abutment platform collinear is provided between the two abutment platforms; The clamping mechanism includes a supporting portion, a workbench is provided with a supporting portion for supporting the inner container before clamping, a rotating column is rotatably provided on the front base, and a plurality of opening plates are provided on the rotating column for circumferentially opening the inner container; The workbench is provided with a track that is parallel to and at the same height as the axis of the rotating column and slides left and right. An electric slider is provided on the track for sliding back and forth. The electric slider is provided with a detection mechanism for detecting the outer surface of the inner tank; The detection mechanism includes a sliding plate. The sliding plate is provided on the electric slider through an adjustment portion. The distance between the sliding plate and the outer surface of the inner container is preliminarily set by the adjustment portion. A visual detector is fixedly provided on the right end surface of the sliding plate. The right end surface of the sliding plate is provided with a fitting unit, which includes four balls arranged in a matrix. The four balls are pressed against the inner liner to control the distance and verticality between the visual detector and the inner liner. The fitting unit also includes a avoiding portion for allowing the ball to avoid the protrusion on the outer surface of the inner container.

2. The device for detecting appearance defects of an enamel liner according to claim 1, characterized in that: The clamping mechanism further comprises a pad. The opposite surfaces of the two abutting platforms are fixedly provided with a pad for direct contact with the inner container. The pad fits in with the arc surfaces at both ends of the inner container.

3. The device for detecting appearance defects of an enamel liner according to claim 2, characterized in that: The rear end face of the rotating column is fixed with a pressing pad that fits against the inner wall of the rear arc of the liner. The liner is clamped by pressing the pressing pad and the rear pad against the front and rear inner walls of the rear section of the liner and cooperating with the front and rear pads to press against the liner.

4. The device for detecting appearance defects of an enamel liner according to claim 1, characterized in that: The clamping mechanism also includes a receiving groove, and the rotating column is provided with a receiving groove corresponding to the support plate one by one. A sliding block is provided in the receiving groove for sliding back and forth. The sliding block and the inner wall of the receiving groove are hingedly provided with a hinge bar, and the support plate is hingedly provided between the corresponding two hinge bars.

5. The device for detecting appearance defects of an enamel liner according to claim 4, characterized in that: The clamping mechanism also includes a driving group arranged on the driving column and used to drive the expansion plate to expand. The driving group includes a threaded rod. The threaded rod is coaxially rotated on the rotating column. A driving ring corresponding to the plate group is arranged on the rotating column for sliding back and forth. The driving ring is sleeved on the threaded rod and the two are threadedly matched. All sliding blocks corresponding to the same plate group are fixedly arranged on the corresponding driving ring.

6. The device for detecting appearance defects of an enamel liner according to claim 1, characterized in that: The detection mechanism also includes a telescopic spring column, a telescopic spring column is passed through the electric slider for sliding left and right, a sliding plate is hingedly provided at the telescopic end of the telescopic spring column, and four swing frames arranged in a rectangular shape and swinging up and down are hingedly provided on the right end surface of the sliding plate, a ball bearing is movably provided on the swing frame, and a pressure spring is commonly provided between two swing frames facing each other up and down; A push frame is provided on the workbench for sliding left and right, and the track is fixed on the push frame. When the push frame moves to the leftmost position within its moving range, it is in a working state.

7. The device for detecting appearance defects of enamel liner according to claim 6, characterized in that: A connecting frame is fixedly arranged between the two front and rear opposite swing frames, and the front and rear swing frames are made to swing synchronously through the connecting frame.

8. The device for detecting appearance defects of an enamel liner according to claim 6, characterized in that: The adjustment part includes a locking plate. The front and rear end surfaces of the electric slider are both movably mounted with locking plates. The two locking plates are locked by bolts. The opposite surfaces of the two locking plates are fixedly provided with locking blocks. The front and rear sides of the telescopic spring column are both provided with locking grooves arranged equidistantly on the left and right.

9. The device for detecting appearance defects of an enamel liner according to claim 7, characterized in that: The avoidance part includes a hydraulic cylinder. The sliding plate is movably provided with two hydraulic cylinders with axes extending from left to right. The telescopic section of the hydraulic cylinder is located on the left side of the sliding plate and a reference block is fixed thereon. The reference block is a right-angled trapezoid with the left side smaller and the right side larger, and the inclined surfaces of the two reference blocks are opposite to each other. The left end surface of the connecting frame is fixed with a reference bar corresponding to the inclined surface of the reference block and passing through the sliding plate. The reference bar cooperates with the inclined surface of the corresponding reference block. Distance sensors corresponding to the balls are provided on both the upper and lower sides of the sliding plate; When the reference block moves to the maximum position on the left, the reference block limits the swing range of the reference bar to limit the swing angle of the swing frame, thereby controlling the distance between the visual detector and the outer surface of the inner container.

10. A method for detecting appearance defects of enamel liner, which is accomplished by using the enamel liner appearance defect detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Place the liner: First, the support portion is raised to a set height, and the liner to be tested is placed on the support portion so that the rotating column extends into the longitudinal section of the liner; S2. Clamping the inner liner: The clamping mechanism supports and clamps the inner liner so that the axis of the inner liner is collinear with the axis of the rotating column and the abutting platform; The front base drives the pressing platform on it to move backward, so that the front and rear pressing platforms press the inner container from the front and rear sides of the inner container; S3. Adjust the spacing and verticality: Adjust the straight-line distance between the visual sensor and the outer surface of the inner liner to the desired value according to the radial size of the inner liner. At this time, all four balls are in close contact with the outer surface of the inner liner. S4. Detect defects: The pressing table drives the inner liner to rotate synchronously, the visual detector works to take pictures of the inner liner surface, and the electric slider moves intermittently at a set distance. The above process is repeated to complete the shooting and detection of the arc section and longitudinal section of the inner liner. All photos are analyzed by existing analysis equipment to finally obtain the appearance defect detection results of the inner liner outer surface.

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