Flatness testing device for plywood

Abstract

The invention provides a flatness testing device for plywood, and relates to the field of plywood detection. The plywood flatness testing device comprises a detection box, a power mechanism for driving plywood to move is arranged in the detection box, a laser detection unit is arranged in the detection box, a plastic film bearing unit is arranged at the inlet end of the detection box, and a plastic film is arranged on the surface of the plastic film bearing unit. A covering unit for covering the plastic film on the surface of the plywood is arranged at the inlet end of the detection box. According to the flatness testing device for the plywood, the laser emitting end is subjected to swing adjustment, so that a light path can be changed, whether the device is damaged or not is detected through preset light path position change and actual light path change, and the surface of the detected plywood is covered with a plastic film; diffuse reflection generated by laser irradiation on the surface of the plywood is modified into mirror reflection generated by laser irradiation on the surface of the plastic film, and therefore the detection precision of the device can be improved.

Description

Technical Field

[0001] The present invention relates to the field of plywood detection, and specifically to a flatness test device for plywood. Background Art

[0002] In the production process of existing plywood, glue is required, which can cause inconsistent thickness of the plywood and affect its flatness. The flatness of plywood complies with the standard of GB / T9846-2015 "General Plywood". When the plywood format is 1220mm×1830mm or larger, the flatness deviation shall not be greater than 30mm. When the format is smaller than 1220mm×1830mm, the flatness deviation shall not be greater than 20mm.

[0003] Existing patent CN109387168A, a flatness test device for plywood, includes a base. At both ends of the base, a fixing mechanism and a detection mechanism are respectively arranged. A fixing block is arranged on the surface of one end of the base, a groove is opened on the fixing block, a movable plate and a rubber pad are arranged in the groove, a telescopic block is arranged on the groove wall of the groove, an inclined surface, a stop block and a spring are all arranged on the telescopic block, a movable frame is movably arranged on the surface of the other end of the base, and a light illumination module and a roller are both arranged on the movable frame. In this technical solution, the light illumination module in the detection mechanism can irradiate on the surface of the composite board. When the light beam generated by the light illumination module irradiates on the composite board, half of the light beam will be blocked, and the other half of the light beam will cover the surface of the composite board. When the surface of the composite board is uneven, the area covered by the light beam will change. At this time, the staff can quickly observe whether the composite board is flat, achieving the purpose of rapid detection and high detection efficiency. However, this technical solution can only monitor the protrusion at one position of the plywood. When there is still an unevenness smaller than the protrusion behind the protrusion, this technical solution cannot detect the uneven position.

[0004] Existing patent CN110132186B, a circuit board flatness detection device, includes a motor, a detection part, a horizontally distributed support mechanism arranged on the detection part, a laser emitter and a laser receiver. The laser emitter and the laser receiver are arranged on the detection part for cooperative use. The support mechanism is composed of a positioning disk, a circular shaft rotatably connected through the center position of the upper end surface of the positioning disk, and two double-headed telescopic rods that cross through the middle position and are on the same horizontal plane. In this technical solution, the support mechanism is composed of two cross-connected and horizontally distributed double-headed telescopic rods. The two double-headed telescopic rods are simultaneously rotatably connected to the circular shaft, and support columns for supporting the corners of the circuit board are arranged at both ends of the double-headed telescopic rods. Thus, the double-headed telescopic rods can rotate and extend to support circuit boards with different external dimensions. This technical solution provides a method for determining flatness by detecting the reflection position after laser irradiation on the detection surface. Due to the rough surface of the plywood, diffuse reflection occurs after laser irradiation, resulting in difficulty in receiving the reflected laser. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a flatness test device for plywood, which solves the problem of inconvenient flatness detection of plywood proposed in the above background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A flatness test device for plywood, including a detection box, inside which there is a power mechanism for driving the plywood to move, a laser detection unit is arranged inside the detection box, a plastic film bearing unit is arranged at the inlet end of the detection box, a plastic film is arranged on the surface of the plastic film bearing unit, and a covering unit for covering the plastic film on the surface of the plywood is arranged at the inlet end of the detection box. The laser detection unit includes a laser emission end and a laser receiving end, and the laser emission end and the laser receiving end slide synchronously in a direction perpendicular to the movement direction of the plywood, and the laser emission end swings relative to the laser receiving end.

[0007] Preferably, the laser detection unit includes a guide rail, which is fixedly installed on the inner top wall of the detection box. A fixed frame is slidably connected below the guide rail. The laser receiving end is fixedly installed at one end of the fixed frame. A connecting sleeve is hinged at the other end of the fixed frame. The laser emission end is fixedly installed inside the connecting sleeve. A protrusion is arranged on one side of the connecting sleeve. A control rod is slidably connected in the middle of the protrusion. Both ends of the control rod are fixedly installed with semi-tooth rings concentric with the hinge shaft of the connecting sleeve. A gear unit for driving the rotation of the semi-tooth ring is engaged with the outside of one of the semi-tooth rings. A rotating shaft rotatably connected to the detection box is fixedly installed at the center of the semi-tooth ring. A driving unit for driving the fixed frame to reciprocate is arranged at the fixed frame.

[0008] Preferably, the number of the fixed frames is multiple, and the multiple fixed frames are equidistantly distributed. All the protrusions jointly slide and connect a control rod.

[0009] Preferably, the driving unit includes a motor, and the output end of the motor is fixedly installed with a lead screw, and the lead screw is engaged with the fixed frame.

[0010] Preferably, the driving unit includes an electromagnetic telescopic sleeve, the free end of the electromagnetic telescopic sleeve is fixedly connected with the fixed frame, and the fixed end of the electromagnetic telescopic sleeve is fixedly connected with the detection box.

[0011] Preferably, the power mechanism includes a frame, the frame penetrates the detection box, a plurality of support frames are arranged at intervals at the bottom end of the frame, support rollers are rotatably connected above the support frames, and limit rollers are arranged on both sides of the support frames between adjacent support rollers. The central axes of some of the support rollers are connected to a motor for driving the rotation of the support rollers.

[0012] Preferably, the plastic film bearing unit includes support arms arranged on both sides of the feeding end of the detection box. A winding sleeve is rotatably clamped at the end of the support frame away from the detection box, and the plastic film is wound on the outer surface of the winding sleeve.

[0013] Preferably, the covering unit includes a fixing frame located between two support frames. The fixing frame is fixedly connected to the detection box. An elastic telescopic sleeve is fixedly installed on the side of the fixing frame away from the detection box. A pressing wheel is fixedly installed at the free end of the elastic telescopic sleeve. The pressing wheel presses the joint of the plastic film and the plywood. A suction fan is arranged on the side away from the detection box. The suction fan is fixedly connected to the frame. The air inlet end of the suction fan is located below the plastic film, and the air outlet end of the suction fan is located on the upper surface of the plywood.

[0014] Preferably, a grille plate is arranged at the air outlet end of the suction fan. The grille plate is divided into two groups that are symmetrically inclined to both sides.

[0015] Preferably, the number of the elastic telescopic sleeves is three. The pressing wheels are arranged below the elastic telescopic sleeves on both sides. A roller is arranged at the bottom end of the middle elastic telescopic sleeve. Needles for puncturing the bubbles of the plastic film are arranged on the surface of the roller.

[0016] Compared with the prior art, the present invention has the following beneficial effects: For this plywood flatness testing device, the laser emitting end and the laser receiving end of the laser detection mechanism are separately arranged. During the simultaneous position movement of the two, the laser emitting end is separately adjusted to swing, so that the optical path can be changed. Whether the device is damaged is detected by presetting the position change of the optical path and the actual optical path change. The surface of the plywood to be detected is covered with a plastic film, and the diffuse reflection of the laser on the plywood surface is modified to the specular reflection of the laser on the plastic film surface, thereby improving the detection accuracy of the device.

[0017] For this plywood flatness testing device, the number of fixing frames is multiple, and the multiple fixing frames are equidistantly distributed. All the protrusions are commonly slidably connected to a control rod. By arranging multiple fixing frames, multiple laser detection units can be set, and thus the displacement length of the laser detection units can be reduced, and the detection of the plywood can be realized more quickly.

[0018] For this plywood flatness testing device, a grille plate is arranged at the air outlet end of the suction fan. The grille plate is divided into two groups that are symmetrically inclined to both sides. By arranging the inclined grille plate, the air outlet direction can be changed, and thus the impurities on the plywood surface can be moved to both sides.

[0019] 4. The flatness test device for the plywood has three sets of elastic telescopic sleeves. The pressure wheels are arranged below the elastic telescopic sleeves on both sides, and a roller is arranged at the bottom of the elastic telescopic sleeve in the middle. Needles for piercing the bubbles of the plastic film are arranged on the surface of the roller. Bubbles are inevitable during the process of attaching the plastic film. The plastic film is flattened as much as possible by the previous pressure wheel, and the bubbles of the plastic film are pierced by the needles, so that the gas in the bubbles is expelled by the latter pressure wheel, making the plastic film fit the plywood as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic diagram of the power mechanism of the present invention; Figure 3 It is a schematic diagram of the covering unit of the present invention; Figure 4 It is a schematic diagram of the connection of the fixing frame of the present invention; Figure 5 It is a schematic diagram of the exhaust fan of the present invention; Figure 6 It is a partial schematic diagram of the exhaust fan of the present invention; Figure 7 It is a schematic diagram of the laser detection unit of the present invention; Figure 8 It is a schematic diagram of the electromagnetic telescopic sleeve of the present invention; Figure 9 It is a schematic diagram of the connection of the control rod of the present invention.

[0021] In the figure: 1. Detection box; 2. Power mechanism; 3. Laser detection unit; 4. Plastic film bearing unit; 5. Plastic film; 6. Covering unit; 301. Laser emission end; 302. Laser receiving end; 303. Guide rail; 304. Fixed frame; 305. Connecting sleeve; 306. Protrusion; 307. Control rod; 308. Half-toothed ring; 309. Gear unit; 310. Rotating shaft; 311. Driving unit; 312. Motor; 313. Lead screw; 314. Electromagnetic telescopic sleeve; 201. Frame; 202. Support frame; 203. Support roller; 204. Limit roller; 205. Motor; 401. Support arm; 402. Winding sleeve; 601. Fixed frame; 602. Elastic telescopic sleeve; 603. Pressure wheel; 604. Exhaust fan; 605. Grille plate; 606. Roller; 607. Needle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0023] In addition, in the present application, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0024] As Figures 1-9 shown, a flatness test device for plywood includes a detection box 1, which is made of metal plates and has through holes opened at designated positions. A power mechanism 2 for driving the plywood to move is arranged inside the detection box 1. A laser detection unit 3 is arranged inside the detection box 1. The laser detection unit 3 emits laser light from above and irradiates the surface of the plywood below. When the plywood is deformed or convex, there is a difference in the vertical direction in the position of the reflected laser, resulting in different positions where the laser reflection is detected, and finally the flatness of the plywood can be determined. A plastic film carrying unit 4 is arranged at the inlet end of the detection box 1. A plastic film 5 is arranged on the surface of the plastic film carrying unit 4. A covering unit 6 for covering the plastic film 5 on the surface of the plywood is arranged at the inlet end of the detection box 1. The laser detection unit 3 includes a laser emission end 301 and a laser reception end 302. The laser emission end 301 and the laser reception end 302 slide synchronously in a direction perpendicular to the movement direction of the plywood, and the laser emission end 301 swings relative to the laser reception end 302. By separately arranging the laser emission end 301 and the laser reception end 302 of the laser detection mechanism and separately adjusting the swing of the laser emission end 301 during the simultaneous movement of the two, the optical path can be changed. By presetting the change in the optical path position and detecting whether the device is damaged according to the actual optical path transformation, and covering the surface of the plywood to be detected with the plastic film 5, the diffuse reflection of the laser on the surface of the plywood is modified to the specular reflection of the laser on the surface of the plastic film 5, thereby improving the detection accuracy of the device.

[0025] The laser detection unit 3 includes a guide rail 303, which is fixedly installed on the inner top wall of the detection box 1. A fixed frame 304 is slidably connected below the guide rail 303. The fixed frame 304 can slide along the guide rail 303. The laser receiving end 302 is fixedly installed at one end of the fixed frame 304. A connecting sleeve 305 is hinged at the other end of the fixed frame 304. The laser transmitting end 301 is fixedly installed inside the connecting sleeve 305. The laser receiving end 302 and the laser transmitting end 301 communicate with the control host wirelessly, or power supply and signal transmission are achieved by setting a conductive slide rail and a conductive slip ring parallel to the guide rail 303. A protrusion 306 is provided on one side of the connecting sleeve 305. A control rod 307 is slidably connected to the middle of the protrusion 306. Semi-toothed rings 308 concentric with the hinge shaft of the connecting sleeve 305 are fixedly installed at both ends of the control rod 307. A gear unit 309 that drives the semi-toothed ring 308 to rotate is engaged with the outside of one of the semi-toothed rings 308. The gear unit 309 includes a motor and a gear. By the operation of the motor to drive the gear, the semi-toothed ring 308 can be driven to swing within a small range. When the motor operates to drive the gear to rotate, the rotation angle of the gear is determined. A rotating shaft 310 rotatably connected to the detection box 1 is fixedly installed at the center of the semi-toothed ring 308. Through such a setting, the laser transmitting end 301 can be driven to swing. A driving unit 311 for driving the fixed frame 304 to reciprocate is provided at the fixed frame 304.

[0026] The number of the fixed frames 304 is multiple, and the multiple fixed frames 304 are equidistantly distributed. All the protrusions 306 commonly slide and connect to a control rod 307. By setting multiple fixed frames 304, multiple laser detection units 3 can be set, and thus the displacement length of the laser detection unit 3 can be reduced, so that the detection of plywood can be realized more quickly.

[0027] The driving unit 311 includes a motor 312. A lead screw 313 is fixedly installed at the output end of the motor 312. The lead screw 313 is engaged with the fixed frame 304. Different fixed frames 304 are respectively engaged at different positions of the lead screw 313. When the lead screw 313 rotates, the multiple fixed frames 304 slide simultaneously. By controlling the rotation direction of the motor 312, the reciprocating movement of the fixed frame 304 can be realized.

[0028] The driving unit 311 includes an electromagnetic telescopic sleeve 314. The free end of the electromagnetic telescopic sleeve 314 is fixedly connected to the fixed frame 304, and the fixed end of the electromagnetic telescopic sleeve 314 is fixedly connected to the detection box 1. The electromagnetic telescopic sleeve 314 drives the fixed frame 304 to perform detection within its telescopic range through reciprocating telescoping, and keeps the moving ranges of adjacent fixed frames 304 continuous, so as to ensure the completion of detection.

[0029] The power mechanism 2 includes a frame 201 which penetrates the detection box 1. At the bottom end of the frame 201, there are support frames 202 distributed at intervals. Above the support frames 202, there are support rollers 203 connected in a rolling manner. Between the adjacent support rollers 203 on both sides of the support frames 202, there are limit rollers 204. The central axes of multiple support rollers 203 are connected to a motor 205 that drives the support rollers 203 to rotate. The plywood is placed above the support rollers 203, and the position of the plywood is limited by the limit rollers 204. Some of the support rollers 203 actively rotate under the action of the motor 205, and the plywood is driven to continuously move forward by the friction between the support rollers 203 and the plywood.

[0030] The plastic film bearing unit 4 includes support arms 401 arranged on both sides of the feeding end of the detection box 1. At the end of the support frame 202 away from the detection box 1, there is a winding sleeve 402 rotatably clamped. The plastic film 5 is wound around the outer surface of the winding sleeve 402. Through such a setting, the plastic film bearing unit 4 can be detached relative to the support arms 401, thereby realizing the replacement of the plastic film 5.

[0031] The covering unit 6 includes a fixing frame 601 located between the two support frames 202. The fixing frame 601 is fixedly connected to the detection box 1. On the side of the fixing frame 601 away from the detection box 1, there is an elastic telescopic sleeve 602 fixedly installed. At the free end of the elastic telescopic sleeve 602, there is a pressing wheel 603 fixedly installed. The pressing wheel 603 presses the connection between the plastic film 5 and the plywood. On the side away from the detection box 1, there is an exhaust fan 604. Through such a setting, the plastic film 5 can be made to closely adhere to the plywood by using the pressing wheel 603 and the exhaust fan 604, so as to better reflect the shape of the plywood. The exhaust fan 604 is fixedly connected to the frame 201. The air inlet end of the exhaust fan 604 is located below the plastic film 5, and the air outlet end of the exhaust fan 604 is located on the upper surface of the plywood. By setting the air outlet end of the exhaust fan 604 above the plywood, the discharged gas can be used to impact the upper surface of the plywood, thereby blowing away the impurities on the surface.

[0032] The air outlet end of the exhaust fan 604 is provided with a grille plate 605. The grille plate 605 is divided into two groups that are symmetrically inclined to both sides. By setting the inclined grille plate 605, the direction of the air outlet can be changed, and thus the impurities on the surface of the plywood can be made to move to both sides.

[0033] There are three sets of elastic telescopic sleeves 602. The pressing wheels 603 are arranged below the elastic telescopic sleeves 602 on both sides. A roller 606 is arranged at the bottom end of the elastic telescopic sleeve 602 in the middle. Needles 607 for puncturing the bubbles of the plastic film 5 are arranged on the surface of the roller 606. Bubbles are inevitably formed during the process of covering the plastic film 5. The previous pressing wheel 603 flattens the plastic film 5 as much as possible. The needles 607 puncture the bubbles of the plastic film 5, and then the subsequent pressing wheel 603 expels the gas in the bubbles, so that the plastic film 5 fits the plywood as much as possible.

[0034] During use, place the plywood above the support rollers 203. Under the action of the motors 205 corresponding to the support rollers 203, the plywood is driven to move into the detection box 1 by the friction of the support rollers 203. Before entering the interior of the detection box 1 during the movement, the plastic film 5 adheres to the surface of the plywood, and the pressing wheel 603 presses tightly against the plastic film 5 to improve the light reflection ability without changing the shape of the plywood. When the plywood enters the detection box 1, the laser emission end 301 and the laser receiving end 302 slide synchronously along the direction perpendicular to the plywood feeding direction. The plywood with the plastic film 5 attached is irradiated by the laser emission end 301 and reflected. The laser emission end 301 records the position of the reflected laser received. By comparing the recorded positions of adjacent recording points, the flatness of the plywood surface is monitored by whether there is a difference.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plywood flatness test device, comprising a test box (1), characterized in that: The detection box (1) is provided with a power mechanism (2) for driving the plywood to move, the detection box (1) is provided with a laser detection unit (3), the inlet end of the detection box (1) is provided with a plastic film bearing unit (4), the surface of the plastic film bearing unit (4) is provided with a plastic film (5), and the inlet end of the detection box (1) is provided with a covering unit (6) for covering the plastic film (5) on the surface of the plywood; The laser detection unit (3) comprises a laser emitting end (301) and a laser receiving end (302); the laser emitting end (301) and the laser receiving end (302) synchronously slide perpendicular to the movement direction of the plywood, and the laser emitting end (301) swings relative to the laser receiving end (302).

2. A plywood flatness testing device according to claim 1, characterized in that: The laser detection unit (3) comprises a guide rail (303), the guide rail (303) being fixedly mounted on the inner top wall of the detection box (1), a fixed frame (304) being slidably connected to the lower portion of the guide rail (303), a laser receiving end (302) being fixedly mounted on one end of the fixed frame (304), a connecting sleeve (305) being hingedly connected to the other end of the fixed frame (304), a laser emitting end (301) being fixedly mounted inside the connecting sleeve (305), a protrusion (306) being provided on one side of the connecting sleeve (305), and the protrusion (306) being provided on the lower portion of the connecting sleeve (305). 6) is slidably connected to the middle of the control rod (307), and half-toothed rings (308) concentric with the hinge axis of the connecting sleeve (305) are fixedly installed at both ends of the control rod (307), and a gear unit (309) for driving the half-toothed ring (308) to rotate is meshed on the outer side of one side of the half-toothed ring (308), and a rotating shaft (310) rotatably connected to the detection box (1) is fixedly installed at the center of the half-toothed ring (308), and a driving unit (311) for driving the fixed frame (304) to reciprocate is arranged at the fixed frame (304).

3. A plywood flatness testing device according to claim 2, characterized in that: There are multiple fixing frames (304), the multiple fixing frames (304) are equidistantly distributed, and all the protrusions (306) are slidably connected to a control rod (307).

4. A plywood flatness testing device according to claim 3, characterized in that: The driving unit (311) comprises a motor (312), and a lead shaft (313) is fixedly mounted on the output end of the motor (312), and the lead shaft (313) is meshed with the fixed frame (304).

5. The flatness testing device for plywood according to claim 3, characterized in that: The driving unit (311) comprises an electromagnetic telescopic sleeve (314), the free end of the electromagnetic telescopic sleeve (314) being fixedly connected to the fixing frame (304), and the fixed end of the electromagnetic telescopic sleeve (314) being fixedly connected to the detection box (1).

6. A plywood flatness testing device according to claim 1, 4 or 5, characterized in that: The power mechanism (2) comprises a frame (201), the frame (201) passes through the detection box (1), the bottom end of the frame (201) is provided with support frames (202) distributed at intervals, the top of the support frames (202) is connected in a rolling manner with support rollers (203), and limit rollers (204) are provided on both sides of the support frame (202) and located between adjacent support rollers (203), wherein the central axes of the plurality of support rollers (203) are connected to motors (205) for driving the support rollers (203) to rotate.

7. A plywood flatness testing device according to claim 6, characterized in that: The plastic film bearing unit (4) comprises support arms (401) arranged on both sides of the feeding end of the detection box (1), and one end of the support frame (202) away from the detection box (1) is rotatably clamped with a winding sleeve (402), and the plastic film (5) is wound around the outer surface of the winding sleeve (402).

8. A plywood flatness testing device according to claim 7, characterized in that: The covering unit (6) comprises a fixing frame (601) located between the two supporting frames (202), the fixing frame (601) being fixedly connected to the detection box (1), a resilient telescopic sleeve (602) being fixedly mounted on a side of the fixing frame (601) away from the detection box (1), and a pressing wheel (603) being fixedly mounted on a free end of the resilient telescopic sleeve (602); An exhaust fan (604) is provided at the connection point between the plastic film (5) and the plywood, where the pressing wheel (603) squeezes the plastic film (5) and the plywood, on a side away from the detection box (1); the exhaust fan (604) is fixedly connected to the frame (201); an air inlet end of the exhaust fan (604) is located below the plastic film (5); and an air outlet end of the exhaust fan (604) is located on the upper surface of the plywood.

9. A plywood flatness testing device according to claim 8, characterized in that: The air outlet end of the exhaust fan (604) is provided with a grille plate (605), and the grille plates (605) are divided into two groups that are symmetrical and inclined toward both sides.

10. A plywood flatness testing device according to any one of claims 6 to 9, characterized in that: The elastic telescopic sleeves (602) are provided in three groups. The pressure wheels (603) are arranged below the elastic telescopic sleeves (602) on both sides. A roller (606) is arranged at the bottom end of the elastic telescopic sleeve (602) in the middle. The surface of the roller (606) is provided with a needle (607) for puncturing bubbles in the plastic film (5).

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