A solid wood door flatness detection device and detection method

Abstract

The application relates to the technical field of flatness detection, and particularly discloses a solid wood door flatness detection device and a detection method, which comprises a machine body and a conveying roller, a winding roller is rotationally connected to the machine body, a film is wound on the winding roller, an elastic hinge is arranged on one side of the machine body, which is opposite to the conveying direction of the door body, and a scraper is arranged on the elastic hinge, the scraper is connected with an external air source, a plurality of air vents are arranged on the side of the scraper close to the winding roller, a photosensitive sensor and a laser emitter for emitting a laser beam are arranged on the machine body, a controller is fixedly connected to the machine body and electrically connected with the external air source and the photosensitive sensor and the scraper, and a marking assembly and a braking assembly are further arranged on the machine body. The application has the effects of improving the detection accuracy and the detection efficiency of the surface flatness of the door body.

Description

Technical Field

[0001] This application relates to the field of wooden door flatness testing technology, and in particular to a device and method for testing the flatness of solid wood doors. Background Technology

[0002] Solid wood doors refer to wooden doors made of natural logs or engineered solid wood. The main manufacturing process of solid wood doors includes material selection, cutting, gluing, planing, carving, and painting. First, the wood is selected and air-dried naturally. Then, it is cut and glued according to the size and specifications of the door. Next, the glued boards are planed. Finally, the wood is painted to achieve the desired color effect and anti-corrosion function.

[0003] After polishing the wood and painting the door, it is necessary to check the flatness of the door. Especially after painting and before delivery, a detailed inspection of the paint surface is required to detect any unevenness or burrs caused by accidents during the painting process. Currently, most door manufacturers manually observe the flatness of the door by shining a flashlight at an angle on the door surface, or by using tools such as a square or level.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: when workers observe the painted door surface manually for a long time, their eyes are prone to fatigue, causing inspection errors. Furthermore, the accuracy of visual observation using tools such as flashlights and levels is low, and the overall efficiency of purely manual inspection by workers is also low. Summary of the Invention

[0005] To address the issues of low accuracy and efficiency in manually inspecting the flatness of door surfaces, this application provides a device and method for testing the flatness of solid wood doors.

[0006] The solid wood door flatness testing device and testing method provided in this application adopt the following technical solution:

[0007] A device and method for detecting the flatness of solid wood doors, comprising a body and a plurality of conveying rollers rotatably connected to the body, characterized in that: a film-winding roller is rotatably connected to the body, a highly transparent and flexible film is wound on the film-winding roller, adjacent films are connected by point breaks, the size of the film is larger than the front / back dimensions of the door, a scraper is elastically hinged to the side of the body opposite to the direction of conveying the film to the door, the scraper abuts against the film on the door, the scraper is connected to an external air source, a plurality of ventilation holes are opened on the side of the scraper near the film-winding roller, when the scraper is vertical, the scraper is in a free state, and the edge of the end of the film that is in contact with the door is coated with an adhesive layer;

[0008] The machine body is equipped with a photosensitive sensor and a laser emitter for emitting a laser beam. The laser emitter is tilted to irradiate the film. The incident point of the laser beam emitted by the laser emitter on the door body is located on the side of the scraper away from the conveying direction of the door body. The photosensitive sensor is symmetrical to the normal of the laser beam emitted by the laser emitter. A controller is fixedly connected to the machine body and electrically connected to an external air source that is connected to the photosensitive sensor and the scraper.

[0009] The machine body is provided with a marking component for marking defective parts of the film after the laser emitter has finished irradiating it. The machine body is also provided with a braking component for controlling the rotational resistance of the film winding roller. The controller is also used to control the marking component and the braking component.

[0010] By adopting the above technical solution, the door body is placed on the conveyor roller, allowing it to move stably. Simultaneously, the side of the film closest to the scraper is attached to the scraper. The air source is turned on, causing the scraper to suck up the end of the film. When the door body moves to the scraper, it squeezes the film, causing the end of the film to adhere to the door body. At the same time, the air source is turned off. The door body continues to move, pushing aside the scraper and causing it to flip. At this point, the scraper elastically abuts against the film on the door body. This process involves the door body moving, the film unwinding the film roller, and the scraper smoothing the film. Then, the portion of the door body with the relatively smooth film attached moves to the laser emitter's irradiation point. Because the film surface is smooth and flat, the laser light is reflected off the film. The reflected laser light is then received by the photosensitive sensor. When the door body surface has a significant bulge or depression, the curvature of the film surface at that point will change slightly, and the reflected laser light will not irradiate the photosensitive sensor. However, when the door body surface has small protrusions such as burrs, air bubbles will form between the film and the door body. When the laser light irradiates these air bubbles, it will emit light. When there are tiny pits on the door surface, the laser light cannot reach the photosensitive sensor due to diffuse reflection. This creates a void between the film and the door, causing diffuse reflection of the laser light. When the photosensitive sensor detects a spot where no laser light is received, it indicates a defect in that area. The photosensitive sensor then feeds this information back to the controller. When the defective area moves to the marking component, the controller marks the defect, allowing staff to visually and accurately understand the condition of the door surface. When one door completely passes the scraper and the next door hasn't reached it, the air source is activated, causing the scraper to hold the next film. At this point, the film at the scraper is suspended. The controller then brakes the film-winding roller. The previous door continues to move, pulling the film, while the scraper rebounds downwards, pressing the film down and breaking the point between adjacent films. After the film breaks, the scraper returns to a vertical position, and the entire process repeats, resulting in high detection efficiency.

[0011] Optionally, the marking assembly includes an electric guide rail fixed to the machine body, an electric suction cup slidably connected to the electric guide rail, a label roller rotatably connected to the machine body and wound with a label roll, a peeling plate fixed to the machine body, and a receiving roller rotatably connected to the machine body. The side of the peeling plate facing the label roll conveying direction is directly between the protective paper and the label on the label roll, and the peeling plate is in close contact with the protective paper. The controller is electrically connected to the electric guide rail, the electric suction cup, and the receiving roller respectively.

[0012] By adopting the above technical solution, after the controller issues a command, the receiving roller rotates, causing the protective paper to move. At this time, the label peeling plate separates the protective paper from the label, and the label moves to the label peeling plate. The electric suction cup picks up the label from the label peeling plate, and then the electric guide rail moves the electric suction cup above the defective part of the door. Finally, the electric suction cup blows air to make the label adhere to the film on the door, so that the staff can intuitively understand the location of the defects on the door surface. Since most door surfaces are relatively flat and only a few doors have defects, the electric guide rail and electric suction cup are sufficient to handle the corresponding workload.

[0013] Optionally, the braking assembly includes a brake disc coaxially mounted on the film-winding roller and a plurality of electromagnets eccentrically aligned with the brake disc. The brake disc is made of a non-ferromagnetic metal, and the electromagnets are electrically connected to the controller.

[0014] By adopting the above technical solution, when the door moves, the controller controls the electromagnet to generate a small magnetic force. At this time, the brake disc is affected by the magnetic field of the electromagnet and eddy currents are generated in the brake disc. The eddy currents generate an induced magnetic field, which in turn opposes the magnetic field of the magnet. Since the opposition is mutual, the rotation of the brake disc is hindered. This is to avoid the accident where the door moving towards the scraper suddenly hits the film and the film pulls the film-winding roller to rotate rapidly, causing the film-winding roller to release too much film and the subsequent film cannot be laid flat on the door. At the same time, when separating two adjacent films, the magnetic force of the electromagnet is increased. At this time, the change in magnetic field makes the brake disc and the electromagnet still conform to Lenz's law, which further increases the resistance to the brake disc, that is, the film-winding roller rotates more slowly, so that the door pulls the film and the scraper presses the film more smoothly.

[0015] Optionally, the braking assembly further includes an iron disc coaxially fixed to one end of the brake disc near the film and a tension spring disposed on the film winding roller. The brake disc is slidably connected to the rotating shaft of the film winding roller. One end of the tension spring is fixedly connected to the end of the iron disc away from the brake disc, and the tension spring is in a stretched state when the brake disc is pressed against the electromagnet.

[0016] By adopting the above technical solution, when it is necessary to disconnect two adjacent films, the magnetic force of the electromagnet is increased, so that the brake disc is subjected to electromagnetic braking. The larger magnetic force will also attract the iron disc to move closer to the electromagnet until the brake disc and the electromagnet are pressed together, so that the brake disc stops. This prevents the film from pulling the film-winding roller to rotate, making the film easier to break. At the same time, it also prevents the film-winding roller from continuing to rotate due to inertia, resulting in additional film being released.

[0017] Optionally, the machine body is rotatably connected to a cleaning roller with a cleaning cloth wound around it on the side of the scraper facing the direction of the door movement. The cleaning roller has a receiving cavity for containing cleaning liquid. The peripheral wall of the cleaning roller also has several leakage holes that communicate with the receiving cavity. A drying roller with a drying cloth wound around it is also rotatably connected between the cleaning roller and the scraper. Both the cleaning roller and the drying roller are elastically pressed against the door.

[0018] By adopting the above technical solution, the cleaning liquid in the containment cavity enters the cleaning cloth on the surface of the cleaning roller through the leakage hole. Before the door is covered with film, the cleaning roller removes the debris on the surface of the door. Then, the drying roller removes the residual cleaning liquid on the door to avoid dust and other debris from being trapped between the film and the door, causing detection errors.

[0019] Optionally, a dust-collecting roller with an electrostatic dust-removing cloth wrapped around its surface is rotatably connected between the drying roller and the film-wrapping roller, and the dust-collecting roller is also elastically pressed against the door.

[0020] By adopting the above technical solution, after the door body has been initially cleaned, the suction roller further adsorbs the fine dust remaining on the door body, further reducing the phenomenon of air bubbles appearing after the film is coated due to dust and other impurities.

[0021] Optionally, the machine body is fixed to both sides of the door body with pressure plates. The bottom surface of the pressure plates is inclined. The height of the bottom surface of the pressure plates gradually decreases from the end facing the door body to the end facing away from the door body. The highest point of the bottom surface of the pressure plates is higher than the height of the film. The bottom surface of the pressure plates abuts against both sides of the film along the length of the film.

[0022] By adopting the above technical solution, during the door conveying process, the pressure plate presses down the film extending out of the door body, so that the two sides of the film are attached to the two sides of the door body and adhere to the door body. Combined with the previous step of attaching the two ends of the door body along its length to the film, that is, all five sides of the door body are wrapped with film. After the flatness of the other side of the door body is checked, the door body is covered with film all around. That is, when the door body passes the inspection, the bagging / filming step in the subsequent packaging process can be skipped and the door can be directly packed and shipped.

[0023] Optionally, a hot air blower is provided on the side of the machine body facing the door conveying direction of the electric suction cup, the air outlet of the hot air blower is aligned with the film, and the hot air blower is electrically connected to the controller.

[0024] By adopting the above technical solution, the hot air blower blows hot air onto the surface of the door after it has been coated, so that the film is thermoplastic and adheres tightly to the surface of the door, thereby making the film adhere to the door more firmly.

[0025] A method for testing the flatness of solid wood doors includes the following steps:

[0026] S1. Convey and clean the door surface. Place the door on the conveying roller and move the conveying roller relatively smoothly. When the door moves, the cleaning roller with cleaning liquid on the surface performs preliminary cleaning of the door surface. Then the drying roller absorbs the cleaning liquid on the door surface. Finally, the dust suction roller absorbs the small amount of dust that falls on the door.

[0027] S2. The surface of the door away from the conveyor roller is covered with film. The clean door continues to move. The part of the film that is in contact with the door is glued to the side wall of the door. The door pushes the scraper to tilt the scraper and place it on the upper surface of the door. At the same time, the external air source connected to the scraper stops sucking air. The tilted scraper continues to press against the surface of the door, pressing the film on the door and smoothing it.

[0028] S3. Detect the location of defects on the surface of the door body away from the conveyor roller. The laser beam emitted by the laser emitter shines on the door body covered with a thin film. The laser beam shining on the door body is then reflected, and the reflected light enters the photosensitive sensor. However, in the defective parts of the door panel, the thin film will produce bubbles or voids, and the light in this area cannot be reflected smoothly to the photosensitive sensor. The photosensitive sensor feeds back the corresponding signal to the controller.

[0029] S4. Fix the film. After being irradiated by the laser beam, the film is pressed by the pressure plate to make the edge of the film stick to the side of the door. Then, the hot air blower blows hot air onto the surface of the film to make the film thermoplastic and stick tightly to the door.

[0030] S5. Mark the location of the defect on the door. The controller controls the electric suction cup to move to the designated position and blows air to make the label adhere to the film at the defect location.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. After the door body with a thin film on its surface is irradiated by a laser emitter, the film at the qualified position will reflect the laser to the photosensitive sensor. At the defective position, diffuse reflection, reflection angle change, scattering and other phenomena will occur, so the photosensitive sensor cannot receive the reflected light from the defective position. At the same time, the photosensitive sensor feeds the signal back to the controller. This detection process has high accuracy.

[0033] 2. The photosensitive sensor feeds back the location of the defect to the controller. After the controller issues a command, the receiving roller rotates, causing the protective paper to move. At this time, the peeling plate separates the protective paper from the label, and the label moves to the peeling plate. The electric suction cup picks up the label from the peeling plate, and then the electric guide rail moves the electric suction cup above the defect on the door. Finally, the electric suction cup blows air to make the label adhere to the film on the door, so that the staff can intuitively understand the location of the defect on the door surface.

[0034] 3. When the door moves, the controller controls the electromagnet to generate a small magnetic force, which hinders the rotation of the brake disc. This prevents the door moving towards the scraper from suddenly hitting the film and causing the film-winding roller to rotate rapidly, resulting in excessive film being released and subsequent films not being laid flat on the door. When it is necessary to disconnect two adjacent films, the magnetic force of the electromagnet is increased. In addition to electromagnetic braking of the brake disc, the larger magnetic force will also attract the iron disc to move closer to the electromagnet until the brake disc and the electromagnet are pressed together, causing the brake disc to stop. This prevents the film from pulling the film-winding roller to rotate, making the film easier to break. It also prevents the film-winding roller from continuing to rotate due to inertia, resulting in additional film being released. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0036] Figure 2 This embodiment of the application is mainly used to illustrate the cross-sectional structural diagram of the film, the vent, and the scraper;

[0037] Figure 3 This is a schematic diagram illustrating the structure of the marking component in an embodiment of this application;

[0038] Figure 4 These are schematic diagrams of embodiments of this application used to illustrate the structure of the machine body, the film winding roller, the film, and the braking assembly;

[0039] Figure 5 This is a cross-sectional structural diagram of the cleaning roller, receiving cavity, leakage hole and hook and loop fastener used in the embodiments of this application;

[0040] Figure 6 This is a partial structural diagram used in this application embodiment to show the door body just coming into contact with the film.

[0041] Reference numerals: 1. Machine body; 11. Conveying roller; 21. Film winding roller; 22. Film; 23. Scraper; 231. Ventilation port; 31. Photosensitive sensor; 32. Laser emitter; 33. Controller; 4. Marking assembly; 41. Electric guide rail; 42. Electric suction cup; 43. Label roller; 44. Label peeling plate; 45. Receiving roller; 5. Braking assembly; 51. Brake disc; 52. Electromagnet; 53. Iron disc; 54. Tension spring; 61. Cleaning roller; 611. Receiving cavity; 612. Leakage hole; 613. Velcro; 62. Drying roller; 63. Dust suction roller; 7. Pressure plate; 8. Hot air blower; 9. Door. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0043] Example 1

[0044] This application discloses a device for detecting the flatness of solid wood doors. (Refer to...) Figure 1 and Figure 2 The solid wood door flatness testing device includes a body 1 and multiple conveying rollers 11 rotatably connected to the body 1. A film-winding roller 21 is rotatably connected to the body 1, and a highly transparent and flexible film 22 is wound on the film-winding roller 21. Each adjacent film 22 is connected by a point-break connection. The size of the film 22 is larger than the front / back dimensions of the door 9. A plastic scraper 23 is hinged to the side of the body 1 opposite to the conveying direction of the film-winding roller 21 to the door 9. The scraper 23 is connected to the body 1 by a... The torsion spring and scraper 23 are pressed against the film 22 located on the door body 9. The scraper 23 is connected to an external fan (not shown in the figure). Several ventilation holes 231 are opened on the side of the scraper 23 near the film winding roller 21. When the scraper 23 is vertical, the torsion spring is in a free state, and at this time the highest point of the ventilation hole 231 is lower than the upper surface of the door body 9. A tension roller is also rotatably connected between the scraper 23 and the film winding roller 21. The edge of the end of the film 22 that is in contact with the door body 9 is coated with an adhesive layer.

[0045] A photosensitive sensor 31 and a laser emitter 32 for emitting a laser beam are fixedly mounted on the machine body 1. In other feasible embodiments, the photosensitive sensor 31 and the laser generator can be adjusted in position and angle by mechanical structures such as lead screws and motors. The laser emitter 32 is tilted to irradiate the film 22. The incident point of the laser beam emitted by the laser emitter 32 on the door body 9 is located on the side of the scraper 23 opposite to the conveying direction of the door body 9, and the normal of the photosensitive sensor 31 and the laser beam emitted by the laser emitter 32 are symmetrical. A controller 33 is fixedly mounted on the machine body 1 and electrically connected to an external air source that communicates with the photosensitive sensor 31 and the scraper 23. The machine body 1 is provided with a marking component 4 for marking defective parts of the film 22 after the laser emitter 32 has finished irradiating. The machine body 1 is also provided with a braking component 5 for controlling the rotational resistance of the film winding roller 21. The controller 33 is also used to control the marking component 4 and the braking component 5.

[0046] The side of the film 22 closest to the scraper 23 is attached to the scraper 23. When the air source is turned on, the scraper 23 sucks up the end of the film 22. When the door 9 moves to the scraper 23, the door 9 squeezes the film 22, causing the end of the film 22 to adhere to the door 9. Simultaneously, the air source is turned off. Then, the door 9 continues to move, pushing open the scraper 23 and causing it to flip. At this point, the scraper 23 elastically abuts against the film 22 located on the door 9. That is, the door 9 moves, the film roller 21 unwinds, and the scraper 23 flattens the film 22. Then, the relatively flat film 22 is attached... The door body 9 moves to the irradiation point of the laser emitter 32. Because the surface of the thin film 22 is smooth and flat, the laser light is reflected off the film 22 and then received by the photosensitive sensor 31. When the surface of the door body 9 has a significant bulge or depression, the curvature of the surface of the thin film 22 at that location will change slightly, and the reflected laser light will not irradiate the photosensitive sensor 31. However, when the surface of the door body 9 has tiny protrusions such as burrs, bubbles will form between the thin film 22 and the door body 9. When the laser light irradiates these bubbles, diffuse reflection will occur. However, when there are tiny pits on the surface of the door 9, the laser light cannot reach the photosensitive sensor 31. This creates a void between the film 22 and the door 9, causing diffuse reflection of the laser light illuminating that area. Therefore, when the photosensitive sensor 31 detects a spot where no laser light is received, it indicates a defect within that area. The photosensitive sensor 31 then feeds this information back to the controller 33. When the defective area on the door 9 moves to the position of the marking component 4, the controller 33 controls the marking component 4 to mark the defect, allowing staff to visually understand the condition of the door 9 surface. When one door 9 has completely passed the scraper 23 and the next door 9 has not yet reached the scraper 23, the air source is turned on so that the scraper 23 sucks up the next film 22. At this time, the film 22 at the scraper 23 is in a suspended state. The controller 33 controls the braking component 5 to stop the film winding roller 21. At this time, the previous door 9 continues to move and pulls the film 22. The scraper 23 rebounds downward and presses down on the film 22, so that the point break between two adjacent films 22 is broken. After the film 22 is broken, the scraper 23 turns back to the vertical state.

[0047] In other feasible implementations, the laser emitter 32 can be replaced with a parallel light source that emits parallel light, and the photosensitive sensor 31 can be replaced with a high-speed camera. When light shines on the location of bubbles on the thin film 22, the high-speed camera can clearly capture the location of the bubbles and then feed it back to the controller 33. However, when the surface of the door 9 has a relatively gentle tilt or unevenness, the thin film 22 is also more tightly attached to the door 9, and no bubbles will appear. The high-speed camera cannot feed back the detailed condition of the surface of the door 9. At this time, the laser irradiation will change due to the change in the angle of the object surface, so the photosensitive sensor 31 can adapt to more situations, and the photosensitive sensor 31 is less expensive than other high-precision light detection equipment.

[0048] Reference Figure 1 and Figure 3 The marking assembly 4 includes an electric guide rail 41 fixed to the machine body 1, an electric suction cup 42 slidably connected to the electric guide rail 41, a label roller 43 rotatably connected to the machine body 1 and wound with a label roll, a peeling plate 44 fixed to the machine body 1, and a receiving roller 45 rotatably connected to the machine body 1. The side of the peeling plate 44 facing the label roll conveying direction is directly between the protective paper and the label of the label roll, and the peeling plate 44 is in close contact with the protective paper. The controller 33 is electrically connected to the electric guide rail 41, the electric suction cup 42 and the receiving roller 45 respectively.

[0049] After the controller 33 issues a command, the receiving roller 45 rotates, causing the protective paper to move. At this time, the peeling plate 44 separates the protective paper from the label, and the label moves onto the peeling plate 44. The electric suction cup 42 picks up the label from the peeling plate 44. Then, the electric guide rail 41 moves the electric suction cup 42 to above the defective area of ​​the door body 9. Finally, the electric suction cup 42 blows air to make the label adhere to the film 22 of the door body 9, so that the staff can intuitively understand the location of the defects on the surface of the door body 9. Since most of the door body 9 surfaces are relatively flat, and only a few door bodies 9 have defects, the electric guide rail 41 and the electric suction cup 42 are sufficient to handle the corresponding workload.

[0050] In other feasible implementations, the marking component 4 can have two sets, one set for attaching non-conforming labels and the other set for attaching product conforming labels, eliminating the need for additional labeling of conforming door bodies 9 later.

[0051] Reference Figure 1 and Figure 4 The braking assembly 5 includes a brake disc 51 coaxially mounted on the film-winding roller 21 and several electromagnets 52 eccentrically aligned with the brake disc 51. In this application, there are three electromagnets 52. The brake disc 51 is made of a non-ferromagnetic metal material, such as copper or aluminum. In this application, the brake disc 51 is a lower-priced aluminum disc. The electromagnets 52 are electrically connected to the controller 33. The braking assembly 5 also includes an iron disc 53 coaxially fixed to one end of the brake disc 51 near the film 22 and a tension spring 54 mounted on the film-winding roller 21. The brake disc 51 is slidably connected to the rotating shaft of the film-winding roller 21. One end of the tension spring 54 is fixedly connected to the end of the iron disc 53 away from the brake disc 51, and the tension spring 54 is in a stretched state when the brake disc 51 is pressed against the electromagnets 52.

[0052] When the door 9 moves, the controller 33 controls the electromagnet 52 to generate a small magnetic force. At this time, the brake disc 51 is affected by the magnetic field of the electromagnet 52, and eddy currents are generated in the brake disc 51. The eddy currents generate an induced magnetic field, which in turn opposes the magnetic field of the electromagnet. Since the opposing effects are mutual, the rotation of the brake disc 51 is hindered. This is to prevent the door 9 moving towards the scraper 23 from suddenly hitting the film 22, causing the film 22 to pull the film winding roller 21 to rotate rapidly, resulting in excessive film feeding on the film winding roller 21 and causing subsequent film 22 to be damaged. Unexpectedly, the film cannot be laid flat on the door 9. When it is necessary to disconnect two adjacent films 22, the magnetic force of the electromagnet 52 is increased, so that the brake disc 51 is electromagnetically braked. The larger magnetic force will also attract the iron disc 53 to move closer to the electromagnet 52 until the brake disc 51 and the electromagnet 52 are pressed together, so that the brake disc 51 stops. This prevents the film 22 from pulling the film roller 21 to rotate, making the film 22 easier to break. At the same time, it also prevents the film roller 21 from continuing to rotate due to inertia, resulting in the additional release of film 22.

[0053] Reference Figure 5 and Figure 6 The machine body 1 is rotatably connected to a cleaning roller 61 with a cleaning cloth wrapped around it on the side of the scraper 23 facing the direction of the door 9. The cleaning roller 61 has a receiving cavity 611 for containing cleaning liquid, which can be alcohol. The peripheral wall of the cleaning roller 61 also has several leakage holes 612 that communicate with the receiving cavity 611. The cleaning roller 61 and the cleaning cloth on its surface are connected by Velcro 613 for easy replacement of the cleaning cloth. A drying roller 62 with a drying cloth wrapped around it is also rotatably connected between the cleaning roller 61 and the scraper 23. Both the cleaning roller 61 and the drying roller 62 are elastically pressed against the door 9. A dust suction roller 63 with an electrostatic dust removal cloth wrapped around its surface is also rotatably connected between the drying roller 62 and the film wrapping roller 21. The dust suction roller 63 is also elastically pressed against the door 9.

[0054] The cleaning fluid in the receiving cavity 611 enters the cleaning cloth on the surface of the cleaning roller 61 through the leakage hole 612. Before lamination, the door body 9 is first cleaned of debris by the cleaning roller 61, and then the remaining cleaning fluid on the door body 9 is removed by the drying roller 62 to prevent dust and other debris from getting stuck between the film 22 and the door body 9, causing detection errors. After the initial cleaning, the door body 9 is further adsorbed by the suction roller 63, which further adsorbs the fine dust remaining on the door body 9, further reducing the phenomenon of air bubbles appearing after lamination due to dust and other impurities.

[0055] Reference Figure 6The machine body 1 is fixed to both sides of the door body 9 with pressure plates 7. The bottom surface of the pressure plate 7 is inclined. The height of the bottom surface of the pressure plate 7 gradually decreases from the end facing the door body 9 to the end facing away from the door body 9. The highest point of the bottom surface of the pressure plate 7 is higher than the height of the film 22. The bottom surface of the pressure plate 7 and the film 22 are pressed together on both sides along the length of the film 22.

[0056] During the conveying process of the door body 9, the pressure plate 7 presses down the film 22 that extends out of the door body 9, so that the two sides of the film 22 are attached to the two sides of the door body 9 and adhered to the door body 9. Combined with the fact that the two ends of the door body 9 along its length are also attached to the film 22 in the previous step, the five sides of the door body 9 are wrapped with the film 22. After the flatness of the other side of the door body 9 is checked, the door body 9 is covered with the film 22. That is, when the door body 9 passes the inspection, the bagging / filming step in the subsequent packaging process can be skipped and it can be directly packed and shipped.

[0057] Reference Figure 6 A hot air blower 8 is provided on the side of the machine body 1 facing the conveying direction of the door body 9 on the side of the electric suction cup 42. The air outlet of the hot air blower 8 is aligned with the film 22. The hot air blower 8 is electrically connected to the controller 33. The hot air blower 8 blows hot air onto the surface of the door body 9 after film covering, so that the film 22 is thermoplastic and tightly attached to the surface of the door body 9, thereby making the film 22 more firmly attached to the door body 9.

[0058] The implementation principle of the solid wood door flatness detection device and method in this application embodiment is as follows: The door body 9 is conveyed by the conveying roller 11. The door body 9 first moves to the cleaning roller 61 and is cleaned by the cleaning roller 61. Then, the drying roller 62 absorbs the cleaning liquid left by the cleaning roller 61 on the door body 9. The dust suction roller 63 further adsorbs the residual microscopic particles on the door body 9. The clean door body 9 continues to move to the scraper 23. At this time, the scraper 23 adsorbs the film 22. The electromagnet 52 is in a strong magnetic force state and is pressed against the brake disc 51. That is, at this time, the film winding roller 21 is in a locked state to prevent the film winding roller 21 from being unstretched or unwound due to accident. When the door body 9 collides with the film 22 at the scraper 23, the film 22 adheres to the door body 9. The door body 9 pushes the scraper 23 to flip. At the same time, the magnetic force of the electromagnet 52 decreases and the resistance of the brake disc 51 is reduced, so that the door body 9 drives the film winding roller 21 to release the film, and the scraper 23. Smooth the film 22 on the door body 9; when the door body 9 covered with the smooth film 22 continues to move to the irradiation position of the laser emitter 32, the film 22 at the qualified position will reflect the laser to the photosensitive sensor 31, while the defective position will experience diffuse reflection, change of reflection angle, scattering and other phenomena, causing the photosensitive sensor 31 to be unable to receive the reflected light from the defective position. At the same time, the photosensitive sensor 31 feeds the signal back to the controller 33; the tested part of the door body 9 moves to the hot air blower 8, the hot air blower 8 heat-plasticizes the film 22, so that the film 22 is tightly attached to the door body 9, and prevents the film 22 from falling off during the delivery of qualified door bodies 9; finally, the door body 9 moves to the marking component 4, the controller 33 controls the electric suction cup 42 to pick up the label and move it to the defective position of the door body 9, and then the electric suction cup 42 blows the label onto the film 22 of the door body 9, so that the staff can intuitively and accurately understand the specific situation of the flatness of the door body 9.

[0059] Example 2

[0060] This application discloses a method for detecting the flatness of solid wood doors, referring to... Figure 1 and Figure 3 The method for testing the flatness of solid wood doors includes the following steps:

[0061] S1. Convey and clean the surface of the door body 9. Place the door body 9 on the conveying roller 11 and make the conveying roller 11 move relatively smoothly. When the door body 9 moves, the cleaning roller 61 with cleaning liquid on its surface performs preliminary cleaning on the surface of the door body 9. Then the drying roller 62 absorbs the cleaning liquid on the surface of the door body 9. Finally, the dust suction roller 63 absorbs the small amount of dust that falls on the door body 9.

[0062] S2. The surface of the door body 9 away from the conveyor roller 11 is covered with film. The clean door body 9 continues to move. The part of the film 22 that is in contact with the door body 9 is glued to the side wall of the door body 9. The door body 9 pushes the scraper 23 to tilt the scraper 23 and place it on the upper surface of the door body 9. At the same time, the external air source connected to the scraper 23 stops sucking air. The tilted scraper 23 continues to press against the surface of the door body 9, pressing the film 22 on the door body 9 and scraping it flat.

[0063] S3. Detect the location of defects on the surface of the door body 9 away from the conveyor roller 11. The laser beam emitted by the laser emitter 32 shines on the door body 9 covered with the thin film 22. The laser beam shining on the door body 9 is then reflected, and the reflected light enters the photosensitive sensor 31. However, in the defective parts of the door panel, the thin film 22 will produce bubbles or voids, and the light in this area cannot be reflected smoothly to the photosensitive sensor 31. The photosensitive sensor 31 feeds back the corresponding signal to the controller 33.

[0064] S4. Fix the film 22. After being irradiated by the laser beam, the film 22 is pressed by the pressure plate 7 to make the edge of the film 22 stick to the side of the door 9. Then, the hot air blower 8 blows hot air onto the surface of the film 22 to make the film 22 thermoplastically stick tightly to the door 9.

[0065] S5. Mark the location of the defect on the door 9. The controller 33 controls the electric suction cup 42 to move to the designated position and controls the electric suction cup 42 to blow air so that the label adheres to the film 22 at the defect location.

[0066] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for detecting the flatness of solid wood doors, comprising a body and a plurality of conveying rollers rotatably connected to the body, characterized in that: A film-winding roller is rotatably connected to the machine body. A highly transparent and flexible film is wound on the film-winding roller. Adjacent films are connected by point breaks. The size of the film is larger than the front / back dimensions of the door. A scraper is elastically hinged to the side of the machine body opposite to the direction of the film-winding roller from the door. The scraper abuts against the film on the door. The scraper is connected to an external air source. Several ventilation holes are opened on the side of the scraper near the film-winding roller. When the scraper is vertical, it is in a free state. The edge of the end of the film that is in contact with the door is coated with an adhesive layer. The machine body is equipped with a photosensitive sensor and a laser emitter for emitting a laser beam. The laser emitter is tilted to irradiate the film. The incident point of the laser beam emitted by the laser emitter on the door body is located on the side of the scraper opposite to the conveying direction of the door body. The photosensitive sensor is symmetrical to the normal of the laser beam emitted by the laser emitter. A controller is fixedly connected to the machine body and electrically connected to an external air source that is connected to the photosensitive sensor and the scraper. The machine body is provided with a marking component for marking defective parts of the film after the laser emitter has finished irradiating it. The machine body is also provided with a braking component for controlling the rotational resistance of the film winding roller. The controller is also used to control the marking component and the braking component. The marking assembly includes an electric guide rail fixed to the machine body, an electric suction cup slidably connected to the electric guide rail, a label roller rotatably connected to the machine body and wound with a label roll, a peeling plate fixed to the machine body, and a receiving roller rotatably connected to the machine body. The side of the peeling plate facing the label roll conveying direction is directly between the protective paper and the label of the label roll, and the peeling plate is pressed against the protective paper. The controller is electrically connected to the electric guide rail, the electric suction cup, and the receiving roller respectively. The braking assembly includes a brake disc coaxially mounted on the film-winding roller and several electromagnets eccentrically aligned with the brake disc. The brake disc is made of a non-ferromagnetic metal material, and the electromagnets are electrically connected to the controller. The braking assembly further includes an iron disc coaxially fixed to one end of the brake disc near the film and a tension spring disposed on the film winding roller. The brake disc is slidably connected to the rotating shaft of the film winding roller. One end of the tension spring is fixedly connected to the end of the iron disc away from the brake disc. When the brake disc is pressed against the electromagnet, the tension spring is in a stretched state. The machine body is fixed to pressure plates on both sides of the door. The bottom surface of the pressure plate is inclined. The height of the bottom surface of the pressure plate gradually decreases from the end facing the door to the end facing away from the door. The highest point of the bottom surface of the pressure plate is higher than the height of the film. The bottom surface of the pressure plate abuts against both sides of the film along the length of the film.

2. The solid wood door flatness testing device according to claim 1, characterized in that: The machine body is rotatably connected to a cleaning roller with a cleaning cloth wound around it on the side of the scraper facing the direction of the door movement. The cleaning roller has a receiving cavity for containing cleaning liquid. The peripheral wall of the cleaning roller also has several leakage holes that communicate with the receiving cavity. A drying roller with a drying cloth wound around it is also rotatably connected between the cleaning roller and the scraper. Both the cleaning roller and the drying roller are elastically pressed against the door.

3. The solid wood door flatness testing device according to claim 2, characterized in that: The machine body is also rotatably connected between the drying roller and the film-wrapping roller, and a dust-collecting roller with an electrostatic dust-removing cloth wrapped around its surface is also elastically pressed against the door body.

4. The solid wood door flatness testing device according to claim 1, characterized in that: A hot air blower is provided on the side of the machine body facing the door conveying direction of the electric suction cup. The air outlet of the hot air blower is aligned with the film. The hot air blower is electrically connected to the controller.

5. A method for detecting the flatness of solid wood doors, based on a solid wood door flatness detection device according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Convey and clean the door surface. Place the door on the conveying roller and move the conveying roller relatively smoothly. When the door moves, the cleaning roller with cleaning liquid on the surface performs preliminary cleaning of the door surface. Then the drying roller absorbs the cleaning liquid on the door surface. Finally, the dust suction roller absorbs the small amount of dust that falls on the door. S2. The surface of the door away from the conveyor roller is covered with film. The clean door continues to move. The part of the film that is in contact with the door is glued to the side wall of the door. The door pushes the scraper to tilt the scraper and place it on the upper surface of the door. At the same time, the external air source connected to the scraper stops sucking air. The tilted scraper continues to press against the surface of the door, pressing the film on the door and smoothing it. S3. Detect the location of defects on the surface of the door body away from the conveyor roller. The laser beam emitted by the laser emitter shines on the door body covered with a thin film. The laser beam shining on the door body is then reflected, and the reflected light enters the photosensitive sensor. However, in the defective parts of the door panel, the thin film will produce bubbles or voids, and the light in this area cannot be reflected smoothly to the photosensitive sensor. The photosensitive sensor feeds back the corresponding signal to the controller. S4. Fix the film. After being irradiated by the laser beam, the film is pressed by the pressure plate to make the edge of the film stick to the side of the door. Then, the hot air blower blows hot air onto the surface of the film to make the film thermoplastic and stick tightly to the door. S5. Mark the location of the defect on the door. The controller controls the electric suction cup to move to the designated position and blows air to make the label adhere to the film at the defect location.

Images