Visual inspection device and method for defects of mechanical parts

Abstract

The invention belongs to the technical field of quality detection, and particularly relates to a visual detection device and method for defects of mechanical parts. Comprising a workbench, a second discharging and stacking frame used for conveying materials, a feeding guide rail used for transferring the materials, a rotary disc conveying table used for adjusting the positions of the materials, a first discharging and stacking frame used for outputting the materials and a visual detection device used for detecting the materials, the rotary disc conveying table is arranged in the middle of the workbench, and the second discharging and stacking frame is arranged on one side of the workbench; a second discharging and stacking frame is arranged on one side of the workbench, a first discharging and stacking frame is arranged on the other side of the workbench, the second discharging and stacking frame is adjacent to the first discharging and stacking frame, battery placement plates are arranged on the first discharging and stacking frame and the second discharging and stacking frame, a visual detection device is arranged on the outer side of the rotary disc conveying table, and a feeding guide rail is arranged between the second discharging and stacking frame and the rotary disc conveying table. According to the invention, the surface of the welding seam can be coated with the allochroic dye, and the contrast ratio of the surface of the welding seam is replaced by ultraviolet illumination during detection, so that the defect of the welding seam is more easily protruded.

Description

Technical Field

[0001] The present invention belongs to the technical field of quality inspection, and in particular relates to a visual inspection device and method for defects in mechanical parts. Background Art

[0002] Visual defect detection is an important technology in the industrial field, mainly used to detect various defects in the product manufacturing process. This technology can detect defects on the welded joint surface of supporting component products, such as cracks, dents, and bubbles.

[0003] With the development of new energy technology, the demand for energy storage batteries has increased, requiring larger capacity batteries, and larger batteries require larger metal shells. As the shell increases, the processing technology of the battery shell has changed, from the previous stamping shell to welding end face welding. The battery shell is the main supporting component of the battery. In order to ensure the service life of the battery, the welding points and surface quality of the battery shell need to be visually inspected to eliminate unqualified products.

[0004] Since the battery shell is often made of aluminum, the contrast of the welding surface is insufficient, making it difficult to identify defects in the weld, resulting in the circulation of defective parts. Summary of the invention

[0005] The purpose of the present invention is to provide a visual inspection device and method for defects in mechanical parts, which can increase the contrast of the weld surface by coating a color-changing dye on the weld surface and irradiate it with ultraviolet light during inspection, so as to make the defects of the weld more prominent.

[0006] The technical solution adopted by the present invention is as follows: A visual inspection device for defects in mechanical parts, comprising a workbench, a discharging and coding rack 2 for conveying materials, a feeding guide rail for transferring materials, a turntable feeder for adjusting the position of materials, a discharging and coding rack 1 for outputting materials, and a visual inspection device for inspecting materials, wherein a turntable feeder is provided in the middle of the workbench, a discharging and coding rack 2 is provided on one side of the workbench, a discharging and coding rack 1 is provided on the other side of the workbench, the discharging and coding rack 2 is adjacent to the discharging and coding rack 1, battery placement plates are provided on the discharging and coding rack 1 and the discharging and coding rack 2, a visual inspection device is provided on the outer side of the turntable feeder, a feeding guide rail is provided between the discharging and coding rack 2 and the turntable feeder, and a battery housing is provided on the top of the battery placement plate; A dye coating device, which is arranged on one side of the feeding guide rail and parallel to the feeding guide rail, and is used to coat the welding surface of the battery shell with a color-changing dye; The shell rotating device is installed between the feeding guide rail and the dye coating device, and is used to drive the battery shell to rotate; A battery handling device, the battery handling device is arranged on a slide table of the feeding guide rail, and the battery handling device is used to carry the battery shell; The dye liquid coating device includes a second mounting rack, a bottom coating device, a dye recovery device, a driving mechanism, an extrusion device, a top coating device, and a quantitative liquid supply device. The bottom coating device and the top coating device are arranged on the side of the second mounting rack close to the second discharging and coding rack, and the bottom coating device and the top coating device are arranged correspondingly. The dye recovery device is arranged on the side of the second mounting rack close to the turntable feeding platform. The quantitative liquid supply device for quantitatively supplying liquid to the bottom coating device and the top coating device is arranged on one side of the bottom coating device and the top coating device. The driving mechanism for driving the dye recovery device and the quantitative liquid supply device is arranged on one side of the second mounting rack.

[0007] The visual inspection device includes a weld inspection device 1, a bottom side inspection camera, a weld inspection device 2, and a top side inspection camera, wherein the bottom side inspection camera and the top side inspection camera are both composed of a CCD camera, a shading plate, and an adjustable slide rail, wherein the top side inspection camera is used to inspect the top of the battery casing, and the bottom side inspection camera is used to inspect the bottom of the battery casing; The structures of the weld detection device 2 and the weld detection device 1 are the same, wherein the weld detection device 2 is used to detect the weld on the top side of the battery shell, and the weld detection device 1 is used to detect the weld on the bottom side of the battery shell; The weld detection device 1 and the weld detection device 2 are irradiated with ultraviolet color developing light at positions corresponding to the welds of the workpieces.

[0008] The weld detection device 1 includes a guide frame and a guide rod cylinder 1, the number of the guide frames is two, one of the guide frames is slidably connected to a CCD camera, and the other guide frame is slidably connected to a shading plate, the CCD camera and the shading plate are arranged correspondingly, and the CCD camera and the shading plate are fixedly connected to the guide frame after being adjusted to correspond to the weld on the bottom side of the battery shell; The driving end of the guide rod cylinder 1 is fixedly connected to a stepper motor 1, and the transmission end of the stepper motor 1 is fixedly connected to a rotating shaft; A support platform is provided on the top of the rotating shaft, and a rubber friction plate is fixedly connected to the top of the support platform. The turntable feed table includes a feed tray, which is connected to the top of the workbench through motor control rotation, and the feed tray is provided with six equidistantly distributed stabilizing holes, and a support sleeve is fixedly connected to the bottom of the feed tray at the outer position corresponding to the stabilizing holes, and an observation surface is provided on the side of the support sleeve away from the axis of the feed tray; The inner side of the bottom of the observation surface is provided with a major arc table protruding inwards.

[0009] The battery handling device includes a guide rod cylinder 2, the driving end of which is fixedly connected to a transfer platform, an air nozzle is provided on one side of the transfer platform, a bearing is slidably inserted in the middle of the air nozzle, a thread is provided in the middle of the bearing, a pressure ring is provided on the top of the air nozzle, the pressure ring is sleeved on the bearing, and the pressure ring is in close contact with the top of the bearing under the extrusion of the nut.

[0010] The shell rotating device includes a stabilizing frame, which is respectively fixed on both sides of the feeding guide rail. A plurality of rotating shafts are rotatably connected to the stabilizing frame, and a transmission belt is wound around the rotating shafts. One of the rotating shafts is slidably connected to the stabilizing frame. An adjusting device is provided on one side of the stabilizing frame, and the adjusting device controls the sliding of the rotating shaft.

[0011] The dye recovery device includes an extrusion block, a felt trough plate 2, and a collection box. The bottom side of the felt trough plate 2 is connected to a reflux bin. The interior of the felt trough plate 2 is provided with a tight felt 2 and a loose felt 1. The tight felt 2 is located on the bottom side of the loose felt 1. The loose felt 1 and the tight felt 2 are adhered to each other at high temperature. The two ends of the tight felt 2 are fixedly connected with a guide plate 1. The outer side of the felt trough plate 2 close to the side of the outer shell rotating device is fixedly connected with an elastic sheet. The guide plate 1 is fixedly connected to the elastic sheet on the adjacent side through a screw. The other side of the guide plate 1 is provided with an extension reset spring. Under normal conditions, the extension reset spring applies a force to the tight felt 2 away from the feeding guide rail. The elastic sheet is bent with a plurality of arched arcs, and the guide plate 1 close to one side of the elastic sheet contacts the inner wall of the felt groove plate 2 under the support of the elastic sheet.

[0012] The bottom coating device comprises a felt groove plate 1, the felt groove plate 1 is inserted and placed on a placement frame 2, a tight felt 1 and a loose felt 2 are fixedly arranged in the felt groove plate 1, the tight felt 1 and the loose felt 2 are bonded by high temperature, a wedge plate is fixedly connected to the bottom of the felt groove plate 1, the inclined surface of the wedge plate faces one side of the feeding guide rail, and the top of the loose felt 2 protrudes from the edge of the felt groove plate 1; The top coating device includes a felt placement slot plate three, the felt placement slot plate three is inserted and placed on the placement frame two, and corresponds to the position of the felt slot plate one, and is opposite to the opening direction close to the feeding guide rail. The felt placement slot plate three is provided with loose felt three, tight felt three, and tight felt four. The loose felt three is located between the tight felt three and the tight felt four. The loose felt three is adhered to the tight felt three and the tight felt four by high temperature. The bottom of the felt placement slot plate three is fixedly connected with a spoiler. The tight felt four is clamped between the felt placement slot plate three and the spoiler. The side of the loose felt three close to the feeding guide rail protrudes from the spoiler. The quantitative liquid supply device includes a moving rod, a liquid storage tank, and a placement tube. The liquid storage tank is fixed on the back of the placement frame 2, and there are two of them. The liquid storage tanks are respectively arranged on the top of the bottom coating device and the top coating device. The moving rod is arranged on the bottom side of the liquid storage tank. One side of the moving rod is hinged with multiple rocker rods 2. The bottom side of the liquid storage tank is connected with multiple placement tubes. The placement tubes are arranged correspondingly in position and number to the rocker rods 2. A one-way valve is arranged at one end of the placement tube close to the liquid storage tank. A sliding rod is arranged at the axis of the placement tube. The sliding rod is fixedly connected to the rocker rod 2. A supporting circular sleeve is arranged between the rocker rod 2 and the placement tube. The bottom of the placement tube is connected with a drain port, the sliding rod is located inside the placement tube and is fixedly connected with a blocking plate, and the blocking plate is normally located between the one-way valve and the drain port and the connection port of the placement tube; An energy storage device is sleeved on one end of the sliding rod away from the placement tube, which is used to reset the swing rod 2. A protruding end is provided on the end surface of the sliding rod, which is used to limit the energy storage device. The one-way valve is composed of a water outlet neck, a return spring, and a blocking ball. One end of the sliding rod normally supports the blocking ball so that there is a gap between the blocking ball and the water outlet neck. The connecting surface of the supporting circular sleeve is an inclined slope, one end of the supporting circular sleeve is fixedly connected to the second swing rod, and the other end of the supporting circular sleeve is fixedly connected to the end surface of the placement tube.

[0013] The extrusion device includes a first pressure plate, a return spring platform, and a swing rod 1. The bottom of the liquid storage tank is slidably connected to the first pressure plate, and both sides of the bottom coating device and the top coating device are fixedly connected to the return spring platform. The top of the return spring platform is slidably connected to the second pressure plate, and the second pressure plate corresponds to the first pressure plate. One end of the first pressure plate is fixedly connected to the second guide plate, and the second guide plate is provided with an inclined inclined slot. The top of the second guide plate is slidably connected to a slider, and the slider is slidably connected to the outside of the liquid storage tank. One side of the second mounting frame is hinged to the middle of the first swing rod, one end of the first swing rod protrudes from the side of the second mounting frame close to the feeding guide rail, and the other end of the first swing rod is hinged to the slider through a connecting rod hinged to its end; An extrusion wedge-shaped platform is arranged between the first pressurizing plate and the second pressurizing plate.

[0014] The driving mechanism includes gear 2, rotating shaft 2, gear 1, and rotating shaft 3. The gear 2 is rotatably connected to the mounting frame 2. One side of the mounting frame 2 is rotatably connected to the rotating shaft 2 at a position corresponding to the middle of the felt groove plate 2. The gear 2 is transmission-connected to the rotating shaft 2 through a pulley. The bottom of the rotating shaft 2 is transmission-connected to a rope wheel, and the rope wheel is transmission-connected to the guide plate 1 through a rope. The gear 1 is rotatably connected to the mounting frame 2, a rotating shaft 3 is rotatably connected to a position corresponding to the movable rod on one side of the mounting frame 2, a cam is transmission-connected to the rotating shaft 3, the cam corresponds to the position of the movable rod, and the gear 1 is transmission-connected to the rotating shaft 3 through a pulley; A placement frame 1 is fixedly connected to one side of the battery transport device, and a tooth plate is fixedly connected to the placement frame 1, and the tooth plate corresponds to the first gear and the second gear.

[0015] A method for visually detecting defects in mechanical parts comprises the following steps; S1: placing the battery placement plate to be stacked with battery shells on the work surface of the discharging and stacking rack 2; S2: The battery shells are transported one by one to the stabilizing holes of the turntable feeding table through the feeding guide rail; S3: When the feeding guide rail moves to the turntable feeding platform and passes through the dye coating device, a color-changing dye is coated on the side of the battery shell close to the dye coating device, and at the same time, the shell rotating device drives the battery shell to rotate, so that the battery shell weld can be coated with the color-changing dye; S4: The turntable feeder is rotated to make the battery shell stop at the positions of the top detection camera, the second weld detection device, the bottom detection camera, and the first weld detection device in sequence, and the surface quality of the workpiece is detected by the set CCD camera, and when the battery shell stops at the positions of the second weld detection device and the first weld detection device, the position of the weld of the workpiece is irradiated with ultraviolet color developing light, so that the coated color-changing dye develops color under the irradiation, so that the defects of the weld can be highlighted; S5: After one side of the workpiece is inspected by the top side inspection camera, the second weld inspection device, the bottom side inspection camera, and the first weld inspection device, the discharge stacking rack repeatedly re-stacks each battery shell.

[0016] The technical effects achieved by the present invention are: The present invention coats the end weld of the battery casing with a color-changing dye locally through a top coating device and a bottom coating device. After that, when the battery casing is transported to a turntable feed table, the contrast between the qualified surface and the defective surface is made more obvious under the ultraviolet irradiation of a weld inspection device and a top side inspection camera, thereby judging whether the workpiece is qualified when the visual inspection device is working.

[0017] According to the present invention, when the second swing arm swings, the sliding rod moves toward the end away from the one-way valve under the support of the inclined slope of the supporting circular sleeve. At this time, the one-way valve is separated from the sliding rod, and the one-way valve is in a one-way closed state. When the sealing plate slides to the connection point between the drain port and the placement pipe, the quantitative dye liquid stored in the sealing plate flows into the corresponding bottom coating device or the top coating device through the drain port, thereby saving the dye liquid and ensuring that the dye liquid can be evenly coated on the end of the battery shell.

[0018] According to the present invention, when the tooth plate is meshed with gear 2, gear 2 drives rotating shaft 2 to rotate, and pulls the rope through rotating shaft 2, and drags the reflux bin to move; when loose felt 1 and tight felt 2 slide in felt groove plate 2, the extrusion block squeezes the loose felt 1, so that the dye liquid recovered by the loose felt 1 flows back to the reflux bin and finally flows into the collection box, thereby achieving the removal of multiple dye liquids adhered to the surface of the battery shell, avoiding the dye liquid adhering to the weld seam to cause subsequent detection errors, and recovering the excess dye liquid at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 The present invention Figure 1 A schematic diagram of the structure from a top view; Figure 3 It is a structural schematic diagram of the turntable feeding platform in the present invention; Figure 4 It is a structural schematic diagram of a weld detection device 1 in the present invention; Figure 5 The present invention Figure 4 A schematic diagram of the structure of zone A; Figure 6 It is a half-section structural schematic diagram of the battery handling device of the present invention; Figure 7 It is a schematic diagram of the structure of the housing rotating device in the present invention; Figure 8 The present invention Figure 7 A schematic diagram of the structure from a top view; Fig. 9 It is a structural schematic diagram of the dye solution coating device in the present invention; Fig.10 The present invention Fig. 9A schematic diagram of the structure of the rear side; Fig.11 The present invention Fig.10 A schematic diagram of the lateral structure of Fig.12 The present invention Figure 1 A schematic diagram of the structure of the F region; Fig.13 It is a half-section structural schematic diagram of the dye recovery device in the present invention; Fig.14 The present invention Fig.13 A schematic diagram of the structure of the C region; Fig.15 It is a half-section structural schematic diagram of the bottom coating device and the top coating device in the present invention; Fig.16 The present invention Fig.15 A schematic diagram of the structure of the D region; Fig.17 The present invention Fig.15 A schematic diagram of the structure of the E zone; Fig.18 The present invention Fig.10 A schematic diagram of the structure of zone B; Fig.19 It is a half-section structural schematic diagram of the quantitative liquid supply device in the present invention; Fig. 20 It is a schematic structural diagram of the extrusion device in the present invention; Fig.21 The present invention Fig. 20 Schematic diagram of the bottom side structure.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Workbench; 2. Feeding guide rail; 3. Turntable feeding platform; 301. Feeding plate; 302. Material stabilizing hole; 303. Support sleeve; 304. Observation surface; 4. Discharging and coding rack 1; 5. Visual inspection device; 51. Welding seam inspection device 1; 511. Guide frame; 512. CCD camera; 513. Shading plate; 514. Guide rod cylinder 1; 515. Stepping motor 1; 516. Rotating shaft; 517. Support platform; 518. Rubber friction plate; 52. Bottom side inspection camera; 53. Welding seam inspection device 2; 54. Top side inspection camera; 6. Dye coating device; 61, mounting frame 2; 62, bottom coating device; 621, felt slot plate 1; 622, loose felt 2; 623, tight felt 1; 624, wedge plate; 63, dye recovery device; 631, collection box; 632, felt slot plate 2; 633, reflux bin; 634, extrusion block; 635, loose felt 1; 636, tight felt 2; 637, extension reset spring; 638, guide plate 1; 639, elastic sheet; 64, driving mechanism; 641, gear 1; 642, gear 2; 643, rotating shaft 2; 644, rope pulley; 645, rotating shaft three; 646, cam; 647, mounting frame one; 648, tooth plate; 65, extrusion device; 651, first pressure plate; 652, second pressure plate; 653, return spring platform; 654, guide plate two; 655, swing rod one; 656, connecting rod; 657, slider; 66, top coating device; 661, felt mounting slot three; 662, tight felt three; 663, tight felt four; 664, spoiler; 665, loose felt three; 67, quantitative liquid supply device; 671, moving rod; 67 2. Rocker arm 2; 673. Liquid storage tank; 674. Placement tube; 675. Support sleeve; 676. Sliding rod; 677. Sealing plate; 678. Drain port; 679. One-way valve; 7. Shell rotating device; 701. Transmission belt; 702. Stepper motor 2; 703. Stabilizing frame; 704. Adjusting device; 705. Rotating shaft; 8. Battery handling device; 801. Guide rod cylinder 2; 802. Transfer table; 803. Air nozzle; 804. Bearing; 805. Pressing ring; 9. Discharging and stacking rack 2; 10. Battery shell; 11. Battery placement plate. DETAILED DESCRIPTION

[0021] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0022] like Figure 1-Figure 21As shown, a visual inspection device for defects in mechanical parts comprises a workbench 1, a discharging and coding rack 29 for conveying materials, a feeding guide rail 2 for transferring materials, a turntable feeder 3 for adjusting the position of materials, a discharging and coding rack 14 for outputting materials, and a visual inspection device 5 for inspecting materials. A turntable feeder 3 is arranged in the middle of the workbench 1, a discharging and coding rack 29 is arranged on one side of the workbench 1, and a discharging and coding rack 14 is arranged on the other side of the workbench 1. The discharging and coding rack 29 is adjacent to the discharging and coding rack 14, and a battery placement plate 11 is arranged on the discharging and coding rack 14 and the discharging and coding rack 29, a visual inspection device 5 is arranged on the outer side of the turntable feeder 3, a feeding guide rail 2 is arranged between the discharging and coding rack 29 and the turntable feeder 3, and a battery housing 10 is arranged on the top of the battery placement plate 11; A dye coating device 6, which is disposed on one side of the feeding guide rail 2 and parallel to the feeding guide rail 2, and is used to coat a color-changing dye on the welding surface of the battery housing 10; The shell rotating device 7 is installed between the feeding guide rail 2 and the dye coating device 6, and the shell rotating device 7 is used to drive the battery shell 10 to rotate; A battery handling device 8, which is disposed on a slide of the feeding guide rail 2, and is used to carry a battery casing 10; Refer to the attached Fig. 9 and attached Fig.10 The dye coating device 6 includes a second mounting frame 61, a bottom coating device 62, a dye recovery device 63, a driving mechanism 64, an extrusion device 65, a top coating device 66, and a quantitative liquid supply device 67. The second mounting frame 61 is provided with a bottom coating device 62 and a top coating device 66 on one side close to the second discharging and coding frame 9. The bottom coating device 62 and the top coating device 66 are provided correspondingly. The second mounting frame 61 is provided with a dye recovery device 63 on one side close to the turntable feeding platform 3. The bottom coating device 62 and the top coating device 66 are provided with a quantitative liquid supply device 67 for quantitatively supplying liquid to the bottom coating device 62 and the top coating device 66. The second mounting frame 61 is provided with a driving mechanism 64 for driving the dye recovery device 63 and the quantitative liquid supply device 67. Furthermore, the discharging and coding rack 1 4 and the discharging and coding rack 2 9 are composed of two cross-jointed screw guide rails, which is the prior art and will not be described in detail here, or is not shown in the figure, and will not be described in detail here.

[0023] Furthermore, compared with the battery placement plate 11 on the discharge and stacking rack 2 9 , the battery placement plate 11 on the dye coating device 6 has a separate column of different-colored areas for storing unqualified components, which is convenient for workers and machines to identify.

[0024] Furthermore, the feeding guide rail 2 is composed of a screw guide rail, and the battery casings 10 are transported to the surface of the turntable feeding platform 3 one by one through cooperation with the battery handling device 8.

[0025] Furthermore, the outer shell of the workbench 1 is additionally provided with a protective shell.

[0026] Refer to the attached Figure 2 The visual inspection device 5 includes a weld inspection device 1 51, a bottom inspection camera 52, a weld inspection device 2 53, and a top inspection camera 54. The bottom inspection camera 52 and the top inspection camera 54 are both composed of a CCD camera, a shading plate, and an adjustable slide rail. The top inspection camera 54 is used to detect the top of the battery housing 10, and the bottom inspection camera 52 is used to detect the bottom of the battery housing 10. The structures of the weld detection device 2 53 and the weld detection device 1 51 are the same, wherein the weld detection device 2 53 is used to detect the weld on the top side of the battery housing 10, and the weld detection device 1 51 is used to detect the weld on the bottom side of the battery housing 10; The weld detection device 1 51 and the weld detection device 2 53 are irradiated with ultraviolet color developing light at the positions corresponding to the welds of the workpieces.

[0027] Furthermore, the weld inspection device 1 51 , the bottom inspection camera 52 , the weld inspection device 2 53 , and the top inspection camera 54 may be equipped with light shields and light sources to ensure the inspection quality.

[0028] Furthermore, the bottom side detection camera 52 and the top side detection camera 54 composed of a CCD camera, a sunshade, and an adjustable slide rail are all existing technologies and will not be described in detail here, or are not shown in the figures, so they will not be described in detail here.

[0029] Furthermore, ultraviolet rays are used to irradiate the weld coated with the color-changing dye, so that the color of the weld surface changes under the irradiation, making the contrast between the defective position of the weld and the qualified surface more obvious, making it easier for the visual inspection device 5 to observe.

[0030] Refer to the attached Figure 4-Figure 5 The weld detection device 51 includes a guide frame 511 and a guide rod cylinder 514. The number of the guide frames 511 is two, one of which is slidably connected to a CCD camera 512, and the other guide frame 511 is slidably connected to a shading plate 513. The CCD camera 512 and the shading plate 513 are correspondingly arranged. The CCD camera 512 and the shading plate 513 are fixedly connected to the guide frame 511 after being adjusted to correspond to the weld on the bottom side of the battery housing 10; The driving end of the guide rod cylinder 514 is fixedly connected to a stepping motor 515, and the transmission end of the stepping motor 515 is fixedly connected to a rotating shaft 516; A support platform 517 is provided on the top of the rotating shaft 516, and a rubber friction plate 518 is fixedly connected to the top of the support platform 517. Furthermore, the support platform 517 is clamped on the end of the rotating shaft 516, and the support platform 517 is a support plate of a size corresponding to the replaceable part.

[0031] Furthermore, the rubber friction sheet 518 is provided with a plurality of rubber sheets radiating from the center to the periphery, so as to enhance the friction force with the bottom end of the battery housing 10 .

[0032] According to the above structure, the action of the guide rod cylinder 514 controls the stepper motor 515 to move up and down as a whole, thereby supporting the battery casing 10 to move upward, and then when the stepper motor 515 works, the battery casing 10 rotates, which facilitates the CCD camera 512 to detect the weld side wall of the battery casing 10.

[0033] Refer to the attached Figure 1 and attached Figure 3 The turntable feed table 3 includes a feed tray 301, which is connected to the top of the workbench 1 by a motor control rotation, and the feed tray 301 is provided with six equidistantly distributed stabilizing holes 302, and the bottom of the feed tray 301 is fixedly connected with a support sleeve 303 at the outer position corresponding to the stabilizing holes 302, and the support sleeve 303 is provided with an observation surface 304 on the side away from the axis of the feed tray 301; The inner side of the bottom of the observation surface 304 is provided with an inwardly protruding major arc table.

[0034] Furthermore, the support sleeve 303, the observation surface 304, and the material stabilizing hole 302 can form an integral module for detecting different types of cylindrical mechanical components.

[0035] Furthermore, the protruding surface provided at the bottom of the observation surface 304 is used to support the battery housing 10 , and the outer diameter of the battery housing 10 is smaller than the arc diameter of the support sleeve 303 and the material stabilizing hole 302 .

[0036] According to the above structure, the battery housing 10 is placed in the stabilizing hole 302 on the feed tray 301 through the battery handling device 8 on the feeding guide rail 2, and the bottom end of the battery housing 10 is supported by the protruding surface on the support sleeve 303 to ensure that the battery housing 10 will not fall over during the rotation of the feed tray 301 and can correspond to the positions of each detector of the visual inspection device 5.

[0037] Refer to the attached Figure 6The battery handling device 8 includes a guide rod cylinder 801, a driving end of the guide rod cylinder 801 is fixedly connected to a transfer platform 802, a gas nozzle 803 is arranged on one side of the transfer platform 802, a bearing 804 is slidably inserted in the middle of the gas nozzle 803, a thread is provided in the middle of the bearing 804, a pressure ring 805 is arranged on the top of the gas nozzle 803, the pressure ring 805 is sleeved on the bearing 804, and the pressure ring 805 is in close contact with the top of the bearing 804 under the extrusion of the nut.

[0038] Furthermore, the support from the top to the bottom of the pressure ring 805 gradually decreases, and the bottom end of the pressure ring 805 contacts the inner ring end surface of the bearing 804 .

[0039] According to the above structure, the transfer table 802 is controlled to move up and down by the guide rod cylinder 801, so that the bearing 804 contacts the top of the battery casing 10, and when the guide rod cylinder 801 is working, the battery casing 10 is lifted upward. Then, when the battery casing 10 moves to the position of the stabilizing hole 302 on the feed tray 301, the bearing 804 stops working and the battery casing 10 is placed in the stabilizing hole 302.

[0040] Refer to the attached Figure 7 and attached Figure 8 The shell rotating device 7 includes a stabilizing frame 703, which is respectively fixed on both sides of the feeding guide rail 2. A plurality of rotating shafts 705 are rotatably connected to the stabilizing frame 703, and a transmission belt 701 is wound around the rotating shafts 705. One of the rotating shafts 705 is slidably connected to the stabilizing frame 703. An adjusting device 704 is provided on one side of the stabilizing frame 703, and the adjusting device 704 controls the sliding of the rotating shaft 705.

[0041] Furthermore, the adjusting device 704 is composed of a driving source, a screw rod, a guide rod, and a slider. The adjusting device 704 drives the rotating shaft 705 to adjust the tightness of the transmission belt 701. The adjusting device 704 is a prior art and will not be described in detail here.

[0042] Furthermore, the outer surface of the transmission belt 701 may be provided with protruding striped friction strips for driving the battery housing 10 to rotate.

[0043] Furthermore, the moving direction of the transmission belt 701 close to the battery housing 10 is opposite to the moving direction of the battery housing 10 .

[0044] According to the above structure, the driving belt 701 is driven to rotate by the operation of the stepper motor 2 702, and the battery shell 10 is rotated when in contact with the outer surface of the battery shell 10, ensuring that the color-changing dye can be coated on the welds of the battery shell 10.

[0045] When the battery casing 10 is between the casing rotating device 7 and the bottom coating device 62 or the dye recovery device 63, the transmission belt 701 is tightened by the adjusting device 704, so that the battery casing 10 fits with the felt position of the bottom coating device 62 and the dye recovery device 63, and at the same time, the pressure on the outer surface of the battery casing 10 is increased, thereby increasing the friction force and ensuring that the battery casing 10 can rotate.

[0046] Refer to the attached Fig.13 and attached Fig.14 The dye recovery device 63 includes an extrusion block 634, a felt slot plate 632, and a collection box 631. The bottom side of the felt slot plate 632 is connected to a reflux bin 633. The interior of the felt slot plate 632 is provided with a tight felt 636 and a loose felt 635. The tight felt 636 is located at the bottom side of the loose felt 635. The loose felt 635 and the tight felt 636 are adhered to each other at high temperature. The two ends of the tight felt 636 are fixedly connected with a guide plate 638. The outer side of the felt slot plate 632 close to the side of the housing rotating device 7 is fixedly connected with an elastic sheet 639. The elastic sheet 639 is fixedly connected to the guide plate 638 on the adjacent side through a screw. The other side of the guide plate 638 is provided with an extension reset spring 637. The extension reset spring 637 normally applies a force to the tight felt 636 away from the side of the feeding guide rail 2. The elastic sheet 639 is bent into a plurality of arched arcs, and the guide plate 1 638 close to one side of the elastic sheet 639 contacts the inner wall of the felt groove plate 2 632 under the support of the elastic sheet 639 .

[0047] Furthermore, the squeezing block 634 is used to extrude the loose felt 635, and the loose felt 635 is in a fluffy state under normal conditions.

[0048] Furthermore, a strip hole communicating with the reflux bin 633 is provided at the extrusion position where the extrusion block 634 and the loose felt 635 meet.

[0049] According to the above structure, when the loose felt 1 635 and the tight felt 2 636 slide in the felt groove plate 2 632, the extrusion block 634 squeezes the loose felt 1 635, so that the dye liquid recovered by the loose felt 1 635 flows back to the reflux bin 633 and finally flows into the collection box 631.

[0050] Refer to the attached Fig.15 and attached Fig.16The bottom coating device 62 includes a felt groove plate 621, which is inserted and placed on the placement frame 61, and a tight felt 623 and a loose felt 622 are fixedly arranged in the felt groove plate 621. The tight felt 623 and the loose felt 622 are bonded by high temperature. The bottom of the felt groove plate 621 is fixedly connected with a wedge plate 624, and the inclined surface of the wedge plate 624 faces one side of the feeding guide rail 2, and the top of the loose felt 622 protrudes from the edge of the felt groove plate 621; Furthermore, the wedge plate 624 is used to guide the dye liquid of the color-changing dye so that the dye liquid accumulates on the side of the felt groove plate 621 close to the battery housing 10, ensuring that the loose felt 622 is pressed and the dye liquid flows toward the end close to the battery housing 10.

[0051] Refer to the attached Fig.15 and attached Fig.17 The top coating device 66 includes a felt placement slot plate three 661, which is inserted and placed on the placement frame two 61, and corresponds to the position of the felt slot plate one 621, and is opposite to the opening direction on the side close to the feeding guide rail 2. Loose felt three 665, tight felt three 662, and tight felt four 663 are arranged in the felt placement slot plate three 661. The loose felt three 665 is located between the tight felt three 662 and the tight felt four 663. The loose felt three 665 is adhered to the tight felt three 662 and the tight felt four 663 through high temperature. The bottom of the felt placement slot plate three 661 is fixedly connected with a baffle plate 664. The tight felt four 663 is clamped between the felt placement slot plate three 661 and the baffle plate 664. The side of the loose felt three 665 close to the feeding guide rail 2 protrudes from the baffle plate 664. Furthermore, the baffle plate 664 is used to prevent the dye solution settled on the bottom side of the felt placement slot plate 3 661 from directly overflowing.

[0052] Furthermore, the tight felt four 663 intersects more closely with the loose felt three 665, so that the amount of dye that can be absorbed by the tight felt four 663 is reduced, allowing more dye to flow in the loose felt three 665.

[0053] Refer to the attached Fig.18 and attached Fig.19The quantitative liquid supply device 67 includes a moving rod 671, a liquid storage tank 673, and a placement tube 674. The liquid storage tank 673 is fixed on the back of the placement frame 61, and there are two of them. The liquid storage tanks 673 are respectively arranged on the top of the bottom coating device 62 and the top coating device 66. The moving rod 671 is arranged on the bottom side of the liquid storage tank 673. One side of the moving rod 671 is hinged with multiple swing rods 672. The bottom side of the liquid storage tank 673 is connected with multiple placement tubes 674. The placement tubes 674 are arranged corresponding to the positions and numbers of the swing rods 672. A one-way valve 679 is arranged at one end of the placement tube 674 close to the liquid storage tank 673. A sliding rod 676 is arranged at the axis of the placement tube 674. The sliding rod 676 is fixedly connected to the swing rod 672. A supporting circular sleeve 675 is arranged between the swing rod 672 and the placement tube 674. The bottom of the placement tube 674 is connected to a drain port 678, and the sliding rod 676 is located inside the placement tube 674 and fixedly connected to a blocking plate 677. The blocking plate 677 is normally located between the one-way valve 679 and the drain port 678 and the connection port of the placement tube 674; An energy storage device is set on one end of the sliding rod 676 away from the placement tube 674, which is used to reset the swing rod 2 672. The end surface of the sliding rod 676 is provided with a protruding end for limiting the energy storage device. The one-way valve 679 is composed of a water outlet neck, a return spring, and a blocking ball. One end of the sliding rod 676 normally supports the blocking ball so that there is a gap between the blocking ball and the water outlet neck. The connecting surface of the supporting circular sleeve 675 is an inclined slope. One end of the supporting circular sleeve 675 is fixedly connected to the second swing rod 672 , and the other end of the supporting circular sleeve 675 is fixedly connected to the end surface of the placement tube 674 .

[0054] Furthermore, by adjusting the gap between the blocking plate 677 and the one-way valve 679, the amount of dye solution injected at a single time can be controlled.

[0055] Furthermore, the one-way valve 679 is a prior art, and under normal conditions, the one-way valve 679 allows the liquid storage tank 673 to communicate with the space between the sealing plate 677 and the one-way valve 679.

[0056] According to the above structure, when the rocker arm 672 swings, supported by the inclined surface of the support sleeve 675, the sliding rod 676 moves toward the end away from the one-way valve 679. At this time, the one-way valve 679 is disengaged from the sliding rod 676, and the one-way valve 679 is in a one-way closed state. When the sealing plate 677 slides to the connection point between the drain port 678 and the placement tube 674, the quantitative dye stored in the sealing plate 677 flows into the corresponding bottom coating device 62 or the top coating device 66 through the drain port 678.

[0057] Refer to the attached Fig. 20 and attached Fig.21The extrusion device 65 includes a first pressure plate 651, a return spring platform 653, and a swing rod 1 655. The bottom of the liquid storage tank 673 is slidably connected to the first pressure plate 651. The bottom coating device 62 and the top coating device 66 are fixedly connected to the return spring platform 653 on both sides. The top of the return spring platform 653 is slidably connected to the second pressure plate 652. The second pressure plate 652 corresponds to the first pressure plate 651. One end of the first pressure plate 651 is fixedly connected to the second guide plate 654. The second guide plate 654 is provided with an inclined groove. The top of the second guide plate 654 is slidably connected to the slider 657. The slider 657 is slidably connected to the outside of the liquid storage tank 673. One side of the second mounting frame 61 is hinged to the middle of the first swing rod 655, one end of the first swing rod 655 protrudes from the side of the second mounting frame 61 close to the feeding guide rail 2, and the other end of the first swing rod 655 is hinged to the slider 657 through a connecting rod 656 hinged to its end; A pressing wedge is provided between the first pressing plate 651 and the second pressing plate 652 .

[0058] Furthermore, an extrusion protrusion is provided on the bottom side of the second pressure plate 652. The extrusion protrusion may be single or multiple to achieve different extrusion effects.

[0059] Furthermore, the protrusion on the slider 657 is slidably engaged in the inclined groove formed in the second guide plate 654 .

[0060] Furthermore, a torsion spring for resetting is provided at the hinge between the first swing rod 655 and the second mounting frame 61.

[0061] Furthermore, magnets with the same magnetic poles can be arranged on adjacent surfaces between the first pressure plate 651 and the second pressure plate 652, and the magnetic sheets can be arranged alternately. When the magnetic sheets move relative to the first pressure plate 651 and the second pressure plate 652, the reset spring platform 653 is pressed down by the action of the magnetic force. At the same time, due to the magnetic attraction of the magnet, the second pressure plate 652 can be moved up and reset under the action of the magnetic force during resetting, which can provide greater downward force and smaller installation interval, and save the installation structure.

[0062] According to the above structure, through the swing of the rocker arm 655, the other end of the rocker arm 655 drags the supporting sleeve 675 to slide through the connecting rod 656, driving the first pressure plate 651 to slide as a whole, and when the extrusion wedge platform is working, the second pressure plate 652 is squeezed to move downward as a whole, and the felt in the bottom coating device 62 and the top coating device 66 is squeezed, and then after the reset spring platform 653 is reset, the second pressure plate 652 is reset under the support of the reset spring platform 653.

[0063] Refer to the attached Figure 11-13The driving mechanism 64 includes a second gear 642, a second rotating shaft 643, a first gear 641, and a third rotating shaft 645. The second gear 642 is rotatably connected to the second mounting frame 61. A second rotating shaft 643 is rotatably connected to one side of the second mounting frame 61 at a position corresponding to the middle of the second felt groove plate 632. The second gear 642 is connected to the second rotating shaft 643 through a pulley. The bottom of the second rotating shaft 643 is connected to a rope wheel 644. The rope wheel 644 is connected to the first guide plate 638 through a rope. Gear 1 641 is rotatably connected to mounting frame 2 61. A rotating shaft 3 645 is rotatably connected to a position corresponding to the movable rod 671 on one side of mounting frame 2 61. A cam 646 is transmission-connected to the rotating shaft 3 645. The position of the cam 646 corresponds to the position of the movable rod 671. Gear 1 641 is transmission-connected to the rotating shaft 3 645 via a pulley. A mounting frame 1 647 is fixedly connected to one side of the battery handling device 8 , and a tooth plate 648 is fixedly connected to the mounting frame 1 647 . The tooth plate 648 corresponds to the gear 1 641 and the gear 2 642 .

[0064] Furthermore, there are multiple tooth plates 648 , the tooth plate on the bottom side of the tooth plate 648 is in driving engagement with gear 2 642 , and the tooth plate on the top side of the tooth plate 648 is in driving engagement with gear 1 641 .

[0065] Furthermore, the working interval of the rotating shaft three 645 is controlled by controlling the number of teeth on the top side of the tooth plate 648.

[0066] Furthermore, the working interval of the rotating shaft three 645 can also be adjusted by controlling the cam protrusion surface of the cam 646.

[0067] Furthermore, the number of working times of the dye recovery device 63 is controlled by controlling the number of tooth plates 648. Each operation of the gear 2 642 and the tooth plate 648 can drive the dye recovery device 63 to work once. According to the above structure, when the tooth plate 648 is in transmission meshing with the gear 2 642, the gear 2 642 drives the rotating shaft 2 643 to rotate, and pulls the rope through the rotating shaft 2 643, and drags the reflux bin 633 to move, and when the loose felt 1 635 and the tight felt 2 636 are driven to slide in the felt groove plate 2 632 through the reflux bin 633, the squeezing block 634 squeezes the loose felt 1 635, so that the dye liquid recovered by the loose felt 1 635 flows back to the reflux bin 633, and finally flows into the collection box 631; Through several rotations of gear 1 641, the rotating shaft 3 645 is driven to rotate synchronously, and the cam 646 is driven to squeeze the movable rod 671 to make the rocker rod 2 672 swing, and then, supported by the inclined surface of the supporting sleeve 675, the sliding rod 676 moves toward the end away from the one-way valve 679. At this time, the one-way valve 679 is disengaged from the sliding rod 676, and the one-way valve 679 is in a one-way closed state. When the sealing plate 677 slides to the connection point between the drain port 678 and the placement tube 674, the quantitative dye stored in the sealing plate 677 flows into the corresponding bottom coating device 62 or the top coating device 66 through the drain port 678.

[0068] A method for visually detecting defects in mechanical parts comprises the following steps; S1: placing the battery placement plate 11 to be stacked with battery shells 10 on the work surface of the discharge stacking rack 29; S2: The battery casings 10 are transported one by one to the stabilizing holes 302 of the turntable feeding platform 3 through the feeding guide rail 2; S3: When the feeding guide rail 2 moves to the turntable feeding platform 3 and passes through the dye coating device 6, a color-changing dye is coated on one side of the battery housing 10 close to the dye coating device 6, and at the same time, the housing rotating device 7 drives the battery housing 10 to rotate, so that the welds of the battery housing 10 can be coated with the color-changing dye; S4: The turntable feeder 3 is rotated so that the battery housing 10 stops at the positions of the top detection camera 54, the weld detection device 2 53, the bottom detection camera 52, and the weld detection device 1 51 in sequence, and the surface quality of the workpiece is detected by the set CCD camera, and when the battery housing 10 stops at the positions of the weld detection device 2 53 and the weld detection device 1 51, the position of the weld of the workpiece is irradiated with ultraviolet color developing light, so that the coated color-changing dye develops color under the irradiation, so that the defects of the weld can be highlighted; S5: After one side of the workpiece is inspected by the top side inspection camera 54, the weld inspection device 2 53, the bottom side inspection camera 52, and the weld inspection device 1 51, the discharge stacking rack 1 4 re-stacks each battery shell 10.

[0069] The working principle of the present invention is as follows: the battery placement plate 11 to be stacked with battery shells 10 is placed on the work surface of the discharge stacking rack 29, and then the battery shells 10 are transported one by one to the stabilizing holes 302 on the feed tray 301 through the feeding guide rail 2. In this process, the end welding surface of the battery shell 10 is coated with color-changing dye through the bottom coating device 62 and the top coating device 66, and the excess dye adhering to the surface of the battery shell 10 is adsorbed and recovered through the driving mechanism 64, which is convenient for subsequent detection. The turntable feed table 3 is rotated so that the battery shell 10 is sequentially detected by the top side detection camera 54 and the weld detection device 2 53. The bottom detection camera 52 and the weld detection device 51 stop at the position, and the surface quality of the workpiece is detected by the set CCD camera. When the battery shell 10 stops at the position of the weld detection device 2 53 and the weld detection device 51, the ultraviolet color developing light is irradiated on the weld position of the workpiece to make the coated color-changing dye develop color under the irradiation, so that the contrast between the qualified surface and the defective surface is more obvious, thereby judging whether the workpiece is qualified when the visual inspection device 5 is working, and finally, when the discharge stacking rack 4 is working, each battery shell 10 is re-stackered according to qualified parts and unqualified parts, so as to facilitate the subsequent operation of personnel or machines.

[0070] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A visual inspection device for defects in mechanical parts, comprising a workbench (1), a second material discharging and coding rack (9) for conveying materials, a material feeding guide rail (2) for transferring materials, a turntable conveyor (3) for adjusting the position of materials, a first material discharging and coding rack (4) for outputting materials, and a visual inspection device (5) for inspecting materials, characterized in that: A turntable feed platform (3) is provided in the middle of the workbench (1), a second discharge stacking rack (9) is provided on one side of the workbench (1), and a first discharge stacking rack (4) is provided on the other side of the workbench (1), the second discharge stacking rack (9) is adjacent to the first discharge stacking rack (4), and both the first discharge stacking rack (4) and the second discharge stacking rack (9) are provided with a battery placement plate (11), a visual inspection device (5) is provided on the outer side of the turntable feed platform (3), a feeding guide rail (2) is provided between the second discharge stacking rack (9) and the turntable feed platform (3), and a battery housing (10) is provided on the top of the battery placement plate (11); a dye coating device (6), the dye coating device (6) being arranged on one side of the feeding guide rail (2) and being arranged parallel to the feeding guide rail (2), the dye coating device (6) being used to coat a color-changing dye on a welding surface of a battery housing (10); A shell rotating device (7), the shell rotating device (7) being installed between the feeding guide rail (2) and the dye coating device (6), and the shell rotating device (7) being used to drive the battery shell (10) to rotate; A battery handling device (8), the battery handling device (8) being arranged on a slide of the feeding guide rail (2), and the battery handling device (8) being used to carry a battery casing (10); The dye coating device (6) comprises a second mounting frame (61), a bottom coating device (62), a dye recovery device (63), a driving mechanism (64), an extrusion device (65), a top coating device (66), and a quantitative liquid supply device (67). The second mounting frame (61) is provided with a bottom coating device (62) and a top coating device (66) on a side close to the second discharging and coding frame (9). The bottom coating device (62) and the top coating device (66) are arranged correspondingly. The second mounting frame (61) is provided with a dye recovery device (63) on a side close to the turntable feeding platform (3). The bottom coating device (62) and the top coating device (66) are provided with a quantitative liquid supply device (67) for quantitatively supplying dye to the bottom coating device (62) and the top coating device (66). The second mounting frame (61) is provided with a driving mechanism (64) for driving the dye recovery device (63) and the quantitative liquid supply device (67).

2. A visual inspection device for defects in mechanical parts according to claim 1, characterized in that: The visual inspection device (5) comprises a weld inspection device 1 (51), a bottom inspection camera (52), a weld inspection device 2 (53), and a top inspection camera (54); the bottom inspection camera (52) and the top inspection camera (54) are both composed of a CCD camera, a light shielding plate, and an adjustable slide rail; the top inspection camera (54) is used to inspect the top of the battery housing (10), and the bottom inspection camera (52) is used to inspect the bottom of the battery housing (10); The structures of the second weld detection device (53) and the first weld detection device (51) are the same, wherein the second weld detection device (53) is used to detect the weld on the top side of the battery casing (10), and the first weld detection device (51) is used to detect the weld on the bottom side of the battery casing (10); The weld detection device 1 (51) and the weld detection device 2 (53) are irradiated with ultraviolet color developing light at positions corresponding to the weld seams of the workpieces; The weld detection device (51) comprises a guide frame (511) and a guide rod cylinder (514). The number of the guide frames (511) is two, one of the guide frames (511) is slidably connected to a CCD camera (512), and the other guide frame (511) is slidably connected to a light shielding plate (513). The CCD camera (512) and the light shielding plate (513) are arranged correspondingly. The CCD camera (512) and the light shielding plate (513) are fixedly connected to the guide frame (511) after being adjusted to correspond to the weld on the bottom side of the battery housing (10); The driving end of the guide rod cylinder 1 (514) is fixedly connected to a stepper motor 1 (515), and the transmission end of the stepper motor 1 (515) is fixedly connected to a rotating shaft (516); A support platform (517) is provided on the top of the rotating shaft (516), and a rubber friction plate (518) is fixedly connected to the top of the support platform (517).

3. The visual inspection device for defects in mechanical parts according to claim 1, characterized in that: The turntable feed platform (3) comprises a feed tray (301), the feed tray (301) is rotatably connected to the top of the workbench (1) through motor control, six equidistantly distributed stabilizing holes (302) are provided on the feed tray (301), a support sleeve (303) is fixedly connected to the bottom of the feed tray (301) at the outer position corresponding to the stabilizing holes (302), and an observation surface (304) is provided on the side of the support sleeve (303) facing away from the axis of the feed tray (301); The inner side of the bottom of the observation surface (304) is provided with a major arc table surface protruding inwards.

4. The visual inspection device for defects in mechanical parts according to claim 1, characterized in that: The battery handling device (8) comprises a guide rod cylinder 2 (801), the driving end of the guide rod cylinder 2 (801) is fixedly connected to a transfer platform (802), a gas nozzle (803) is arranged on one side of the transfer platform (802), a bearing (804) is slidably inserted in the middle of the gas nozzle (803), a thread is provided in the middle of the bearing (804), a pressure ring (805) is arranged on the top of the gas nozzle (803), the pressure ring (805) is sleeved on the bearing (804), and the pressure ring (805) is in close contact with the top of the bearing (804) under the pressure of a nut.

5. The visual inspection device for defects in mechanical parts according to claim 1, characterized in that: The shell rotating device (7) comprises a stabilizing frame (703), the stabilizing frame (703) being respectively fixed on both sides of the feeding guide rail (2), a plurality of rotating shafts (705) being rotatably connected to the stabilizing frame (703), a transmission belt (701) being wound around the rotating shafts (705), one of the rotating shafts (705) being slidably connected to the stabilizing frame (703), an adjusting device (704) being provided on one side of the stabilizing frame (703), the adjusting device (704) controlling the sliding of the rotating shaft (705).

6. The visual inspection device for defects in mechanical parts according to claim 1, characterized in that: The dye recovery device (63) comprises an extrusion block (634), a felt trough plate 2 (632), and a collection box (631). The bottom side of the felt trough plate 2 (632) is connected to a reflux bin (633). The interior of the felt trough plate 2 (632) is provided with a compact felt 2 (636) and a loose felt 1 (635). The compact felt 2 (636) is located at the bottom side of the loose felt 1 (635). The loose felt 1 (635) and the compact felt 2 (636) are bonded at high temperature. The two ends of the felt second (636) are fixedly connected to the guide plate one (638); the outer side of the felt groove plate second (632) close to the housing rotating device (7) is fixedly connected to the elastic sheet (639); the guide plate one (638) is fixedly connected to the elastic sheet (639) on the adjacent side through a screw rod; the other side of the guide plate one (638) is provided with an extension return spring (637); the extension return spring (637) normally applies a force to the tight felt second (636) away from the feeding guide rail (2); The elastic sheet (639) is bent to form a plurality of arched arcs, and the guide plate 1 (638) close to the side of the elastic sheet (639) contacts the inner wall of the felt groove plate 2 (632) under the support of the elastic sheet (639).

7. The visual inspection device for defects in mechanical parts according to claim 1, characterized in that: The bottom coating device (62) comprises a felt groove plate 1 (621), wherein the felt groove plate 1 (621) is inserted and placed on a placement frame 2 (61), wherein a tight felt 1 (623) and a loose felt 2 (622) are fixedly arranged in the felt groove plate 1 (621), wherein the tight felt 1 (623) and the loose felt 2 (622) are bonded together by high temperature, and a wedge plate (624) is fixedly connected to the bottom of the felt groove plate 1 (621), wherein the inclined surface of the wedge plate (624) faces one side of the feeding guide rail (2), and the top of the loose felt 2 (622) protrudes from the edge of the felt groove plate 1 (621); The top coating device (66) comprises a felt placement slot plate three (661), wherein the felt placement slot plate three (661) is inserted and placed on the placement frame two (61), and corresponds to the position of the felt slot plate one (621), and is opposite to the opening direction of one side close to the feeding guide rail (2), and the felt placement slot plate three (661) is provided with loose felt three (665), tight felt three (662), and tight felt four (663), and the loose felt three (665) is located on the tight felt three (663). 662) and tight felt four (663), the loose felt three (665) is bonded to the tight felt three (662) and the tight felt four (663) by high temperature, the bottom of the felt placement slot plate three (661) is fixedly connected with a baffle plate (664), the tight felt four (663) is clamped between the felt placement slot plate three (661) and the baffle plate (664), and the side of the loose felt three (665) close to the feeding guide rail (2) protrudes from the baffle plate (664); The quantitative liquid supply device (67) comprises a movable rod (671), a liquid storage tank (673), and a placement tube (674). The liquid storage tank (673) is fixed to the back of the placement frame (61) and is in two pieces. The liquid storage tanks (673) are respectively arranged on the top of the bottom coating device (62) and the top coating device (66). The movable rod (671) is arranged on the bottom side of the liquid storage tank (673). One side of the movable rod (671) is hinged with a plurality of swing rods (672). The bottom side of the housing (674) is connected to a plurality of housing tubes (674), the housing tubes (674) are arranged in a corresponding position and number to the second swing rod (672), a one-way valve (679) is arranged at one end of the housing tube (674) close to the liquid storage tank (673), a sliding rod (676) is arranged at the axis of the housing tube (674), the sliding rod (676) is fixedly connected to the second swing rod (672), and a supporting circular sleeve (675) is arranged between the second swing rod (672) and the housing tube (674); The bottom of the placement tube (674) is connected to a drainage port (678); the sliding rod (676) is located inside the placement tube (674) and is fixedly connected to a blocking plate (677); the blocking plate (677) is normally located between the one-way valve (679) and the drainage port (678) and the connection port of the placement tube (674); An energy storage device is sleeved on one end of the sliding rod (676) away from the placement tube (674) for resetting the second swing rod (672); a protruding end is provided on the end surface of the sliding rod (676) for limiting the energy storage device; The one-way valve (679) is composed of a water outlet neck, a return spring, and a blocking ball. One end of the sliding rod (676) normally supports the blocking ball so that a gap exists between the blocking ball and the water outlet neck. The connecting surface of the supporting circular sleeve (675) is an inclined slope, one end of the supporting circular sleeve (675) is fixedly connected to the second swing rod (672), and the other end of the supporting circular sleeve (675) is fixedly connected to the end surface of the placement tube (674).

8. The visual inspection device for defects in mechanical parts according to claim 7, characterized in that: The extrusion device (65) comprises a first pressure plate (651), a return spring platform (653), and a swing rod (655); the bottom of the liquid storage tank (673) is slidably connected to the first pressure plate (651); both sides of the bottom coating device (62) and the top coating device (66) are fixedly connected to the return spring platform (653); the top of the return spring platform (653) is slidably connected to the second pressure plate (652); the second pressure plate (652) corresponds to the first pressure plate (651); one end of the first pressure plate (651) is fixedly connected to the second guide plate (654); the second guide plate (654) is provided with an inclined slot; the top of the second guide plate (654) is slidably connected to a slider (657); the slider (657) is slidably connected to the outside of the liquid storage tank (673); One side of the second mounting frame (61) is hinged to the middle of the first swing rod (655), one end of the first swing rod (655) protrudes from the side of the second mounting frame (61) close to the feeding guide rail (2), and the other end of the first swing rod (655) is hinged to the slider (657) via a connecting rod (656) hinged to its end; An extrusion wedge platform is provided between the first pressurizing plate (651) and the second pressurizing plate (652).

9. A visual inspection device for defects in mechanical parts according to claim 8, characterized in that: The driving mechanism (64) comprises a second gear (642), a second rotating shaft (643), a first gear (641), and a third rotating shaft (645); the second gear (642) is rotatably connected to the second mounting frame (61); a second rotating shaft (643) is rotatably connected to one side of the second mounting frame (61) at a position corresponding to the middle of the second felt groove plate (632); the second gear (642) is transmission-connected to the second rotating shaft (643) via a pulley; a rope wheel (644) is transmission-connected to the bottom of the second rotating shaft (643); and the rope wheel (644) is transmission-connected to the first guide plate (638) via a rope; The gear one (641) is rotatably connected to the mounting frame two (61); a rotating shaft three (645) is rotatably connected to a position corresponding to the movable rod (671) on one side of the mounting frame two (61); a cam (646) is transmission-connected to the rotating shaft three (645); the cam (646) corresponds to the position of the movable rod (671); and the gear one (641) is transmission-connected to the rotating shaft three (645) via a pulley; A placement frame 1 (647) is fixedly connected to one side of the battery transport device (8), and a toothed plate (648) is fixedly connected to the placement frame 1 (647), and the toothed plate (648) corresponds to gear 1 (641) and gear 2 (642).

10. A method for visually detecting defects in mechanical parts, using the visual detection device for defects in mechanical parts as claimed in any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: placing the battery placement plate (11) to be stacked with battery shells (10) on the work surface of the second discharge stacking rack (9); S2: conveying the battery casings (10) one by one into the stabilizing holes (302) of the turntable conveying platform (3) through the feeding guide rail (2); S3: When the feeding guide rail (2) passes through the dye coating device (6) during the process of moving to the turntable feeding platform (3), a color-changing dye is coated on the side of the battery housing (10) close to the dye coating device (6), and at the same time, the housing rotating device (7) drives the battery housing (10) to rotate, so that the weld of the battery housing (10) can be coated with the color-changing dye; S4: The turntable feeder (3) is rotated so that the battery housing (10) stops at the positions of the top detection camera (54), the second weld detection device (53), the bottom detection camera (52), and the first weld detection device (51) in sequence, and the surface quality of the workpiece is detected by the provided CCD camera. When the battery housing (10) stops at the positions of the second weld detection device (53) and the first weld detection device (51), the position of the weld of the workpiece is irradiated with ultraviolet color developing light so that the coated color changing dye develops color under the irradiation, so that the defects of the weld can be highlighted; S5: After one side of the workpiece has been inspected by the top inspection camera (54), the second weld inspection device (53), the bottom inspection camera (52), and the first weld inspection device (51), the first discharge stacking rack (4) re-stacks the battery casings (10).

Images