A device for sanding a surface of a plywood

Abstract

The present application provides a kind of plywood surface polishing device, belong to polishing device technical field, the plywood surface polishing device includes: polishing body and conveying device, conveying device is used to carry and transport plywood, and transport plywood to the inside of polishing body, polishing body is used to polish plywood surface, further include: load feedback drive mechanism, install on conveying device, for sensing the load size that conveying device is suffered when transporting plywood;Speed change mechanism is connected with load feedback drive mechanism;The present application is by being provided with load feedback drive mechanism and speed change mechanism, the conveying speed of conveying device can be self-adapting adjustment with abrasive belt wear degree, to effectively overcome the technical defects of the polishing effect of fixed time is not consistent due to abrasive belt wear, significantly improve the consistency of product surface roughness, thickness size uniformity and yield rate.

Description

Technical Field

[0001] This invention belongs to the technical field of sanding devices, and specifically relates to a sanding device for plywood surfaces. Background Technology

[0002] In the production and processing of plywood, surface sanding is a crucial step that determines the final flatness, smoothness, and adhesion of subsequent coatings. Currently, belt sanders are widely used in the industry to perform fixed-thickness sanding and fine polishing on the plywood surface.

[0003] In the prior art, plywood is conveyed to the area below the sanding belt by a conveyor device, so that the sanding belt comes into contact with the plywood. The surface of the plywood can be sanded by the uniform movement of the plywood.

[0004] However, as a coated abrasive, sanding belts inevitably experience passivation, breakage, and shedding of abrasive grains during grinding operations, leading to irreversible wear. With increasing cumulative usage time, the material removal rate (cutting amount) per unit time decreases significantly. Under a fixed grinding time control mode, there is a significant difference in the effective grinding work applied to plywood by new sanding belts and those nearing the end of their service life. This difference directly results in the following: within the same batch of plywood, boards processed earlier may have a smooth surface and meet thickness standards due to sufficient grinding, while boards processed later may exhibit uneven surface roughness, localized grinding marks, or even thickness deviations due to insufficient grinding, severely impacting product quality consistency and yield.

[0005] Therefore, overcoming the technical defect of inconsistent grinding results at a fixed time due to abrasive belt wear, and providing an improved solution that can adapt to the abrasive belt wear state and ensure the stability of grinding results, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a plywood surface sanding device, which aims to solve the problem of how to overcome the defects of inconsistent sanding results at a fixed time due to abrasion of the sanding belt in the prior art, so as to improve the consistency of plywood sanding quality.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a plywood surface sanding device, comprising: a sanding body and a conveying device, wherein the conveying device is used to carry and convey plywood and to convey the plywood into the sanding body, the sanding body is used to sand the surface of the plywood, and further comprising: a load feedback transmission mechanism, installed on the conveying device, for sensing the load magnitude of the conveying device when conveying the plywood; a speed change mechanism, connected to the load feedback transmission mechanism; and a drive device, connected to the load feedback transmission mechanism through the speed change mechanism; when the conveying device is subjected to a load, the load feedback transmission mechanism adjusts the speed change mechanism according to the sensed load magnitude, so that the rotational speed output by the drive device to the conveying device changes accordingly, thereby realizing the adaptive adjustment of the conveying device's movement speed according to the load magnitude.

[0008] A further technical solution of the present invention is that the conveying device includes a mounting frame, rollers rotatably disposed at both ends of the mounting frame, and a conveyor belt sleeved on the rollers, with the plywood placed on the conveyor belt.

[0009] A further technical solution of the present invention is that the load feedback transmission mechanism is mounted on the roller, and includes a rotating shaft passing through the inside of the roller and an elastic element disposed between the roller and the rotating shaft, wherein the rotating shaft drives the roller to rotate through the elastic element.

[0010] A further technical solution of the present invention is that the roller has a through hole along its axial direction, the inner wall of the through hole is provided with an internal thread, and the rotating shaft is provided with a ball screw pair that cooperates with the internal thread. When the rotating shaft and the roller rotate relative to each other, the rotating shaft moves along the axial direction of the roller under the cooperation of the internal thread and the ball screw pair.

[0011] A further technical solution of the present invention is that a sliding sleeve is slidably sleeved on the rotating shaft, and the rotating shaft and the sliding sleeve are connected by a keyway so that the sliding sleeve can only slide along the axial direction of the rotating shaft and rotate synchronously with the rotating shaft. One end of the elastic element is connected to the roller, and the other end is connected to the sliding sleeve.

[0012] A further technical solution of the present invention is that the speed change mechanism includes a driven wheel fixedly connected to one end of the rotating shaft and a driving wheel that frictionally engages with the driven wheel. The output end of the drive device is connected to the driving wheel, and the driving wheel drives the driven wheel to rotate through friction.

[0013] A further technical solution of the present invention is that the driven wheel is disc-shaped, the driving wheel is frustoconical, the rotation axis of the driving wheel is inclined relative to the rotation axis of the driven wheel, and the generatrix of the conical surface on the side of the driving wheel that contacts the driven wheel is parallel to the rotation axis of the driven wheel.

[0014] A further technical solution of the present invention includes a lifting frame, on which a drive device is mounted. The lifting frame is used to adjust the height of the drive device so that the driving wheel and the driven wheel are in contact.

[0015] A further technical solution of the present invention is that the roller is provided with receiving cavities at both ends, the elastic element is installed inside the receiving cavity, the opening end of the receiving cavity is closed by an end cover, and the rotating shaft extends through the end cover to the outside of the roller.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By setting up a load feedback transmission mechanism and a speed change mechanism, the present invention enables the conveying speed of the conveying device to be adaptively adjusted according to the wear degree of the sanding belt, thereby effectively overcoming the technical defect of inconsistent grinding effect at a fixed time due to sanding belt wear, and significantly improving the consistency of product surface roughness, uniformity of thickness and yield.

[0018] 2. Based on the automatic adjustment of the plywood output speed, this invention can also remind workers of the wear level of the sanding belt in real time. When the output speed slows down significantly or falls below the predetermined value, it can remind workers to replace the sanding belt. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of a specific embodiment of the present invention;

[0021] Figure 2 This is a front view of a specific embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the transmission device in a specific embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the load feedback transmission mechanism in a specific embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the installation of the sliding sleeve in a specific embodiment of the present invention.

[0025] In the diagram: 1. Grinding body; 2. Conveying device; 3. Plywood; 4. Load feedback transmission mechanism; 5. Speed ​​change mechanism; 6. Drive device; 8. Lifting frame; 11. Housing; 12. Base; 13. Grinding assembly; 14. Dust collection assembly; 21. Mounting bracket; 22. Roller; 23. Conveyor belt; 41. Shaft; 42. Elastic element; 43. Sliding sleeve; 44. End cap; 51. Driven wheel; 52. Driving wheel; 81. Connecting arm; 221. Through hole; 222. Receiving cavity; 223. Internal thread; 411. Ball screw pair. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-5 The present invention provides the following technical solution: a plywood surface sanding device, comprising a sanding body 1, a conveying device 2, a load feedback transmission mechanism 4, a speed change mechanism 5, and a driving device 6. The conveying device 2 is used to carry and transport plywood 3, and is disposed below the sanding body 1. It can transport the plywood 3 to the processing station of the sanding body 1, where the sanding body 1 performs sanding operations on its surface. The load feedback transmission mechanism 4 is installed on the conveying device 2 and connected to the speed change mechanism 5. The driving device 6 is connected to the load feedback transmission mechanism 4 through the speed change mechanism 5. When the conveying device 2 is subjected to a load, the load feedback transmission mechanism 4 adjusts the speed change mechanism 5 according to the sensed load size, so that the rotational speed output by the driving device 6 to the conveying device 2 changes accordingly, thereby realizing the adaptive adjustment of the movement speed of the conveying device 2 according to the load size.

[0028] Please see Figure 1 and Figure 2 The sanding body 1 includes a housing 11, which is mounted on a base 12. Inside the housing 11, there is a sanding component 13 and a dust collection component 14. The sanding component 13 is used to sand the surface of the plywood 3, and the dust collection component 14 is used to extract the dust from the plywood 3 to prevent dust from being generated. Both the sanding component 13 and the dust collection component 14 are existing technologies, and their specific structures will not be described in detail.

[0029] Please see Figures 1-3The conveying device 2 includes a mounting frame 21, which is fixed to the base 12 by support legs. Rollers 22 are provided at both ends of the mounting frame 21, one of which is a driving roller and the other is a driven roller. A conveyor belt 23 is mounted on the mounting frame 21. The two rollers 22 are used to spread the conveyor belt 23 and drive the conveyor belt 23 to rotate. The plywood 3 is placed on the conveyor belt 23, so that the conveyor belt 23 drives the plywood 3 to move into the interior of the grinding body 1 and makes the upper surface of the plywood 3 contact the grinding body 1, thereby allowing the surface of the plywood 3 to be ground.

[0030] Please see Figure 4 and Figure 5 The load feedback transmission mechanism 4 is installed on the active roller 22 (hereinafter referred to as "roller 22"). The mechanism includes a rotating shaft 41 disposed inside the roller 22. The roller 22 has a through hole 221 along its axial direction. The through hole 221 is coaxially arranged with the rotating shaft 41, so that the rotating shaft 41 can rotate freely in the through hole 221. The two ends of the roller 22 are respectively provided with cylindrical receiving cavities 222. The receiving cavities 222 are also coaxially arranged with the through hole 221. Each receiving cavity 222 is equipped with an elastic element 42. The elastic element 42 is used to reset the relative rotation between the roller 22 and the rotating shaft 41, and also to sense the change of the grinding load. The elastic element 42 can be a torsion spring, one end of which is fixedly connected to the inner wall of the receiving cavity 222, and the other end is installed on the rotating shaft 41.

[0031] During operation, the conveyor belt 23 moves the plywood 3 to below the grinding body 1, and the direction of movement of the sanding belt is opposite to that of the plywood 3. When the sanding belt is new, its surface abrasive grains are relatively rough, and the friction between the sanding belt and the plywood 3 reaches its maximum. Therefore, the conveyor belt 23 needs to provide a larger torque to drive the plywood 3 to move. At this time, when the rotating shaft 41 drives the roller 22 to rotate through the elastic element 42, it will first compress the elastic element 42 to store energy, so that the rotating shaft 41 and the roller 22 will rotate relative to each other. When the compressive potential energy of the elastic element 42 is sufficient to drive the roller 22 to rotate, the rotating shaft 41 and the roller 22 will rotate synchronously. The roller 22 will then drive the plywood 3 to move through the belt to grind the plywood 3.

[0032] An internal thread 223 is provided inside the perforation 221. A ball screw pair 411 that mates with the internal thread 223 is provided on the rotating shaft 41. Of course, the ball screw pair 411 can also be configured as an external thread that mates with the internal thread 223; this is not a limitation. When relative rotation occurs between the rotating shaft 41 and the roller 22, the internal thread 223 and the ball screw pair 411 allow the rotating shaft 41 to move axially within the roller 22. A sliding sleeve 43 is fitted on the rotating shaft 41, and a keyway is provided on the rotating shaft 41. A key that matches the keyway is provided on the sliding sleeve 43, allowing the sliding sleeve 43 to slide axially only on the rotating shaft 41. At the same time, when the rotating shaft 41 rotates, it can drive the sliding sleeve 43 to rotate. The end of the elastic element 42 that is away from the receiving cavity 222 is fixed to the sliding sleeve 43. To prevent interference between the rotating shaft 41 and the elastic element 42 during axial movement, end caps 44 are bolted to both ends of the receiving cavity 222 at both ends of the roller 22. The rotating shaft 41 passes through the end caps 44 to the outside of the roller 22. One end of the sliding sleeve 43 abuts against the end cap 44, which can be used to limit the axial movement of the sliding sleeve 43 and prevent the sliding sleeve 43 from displacing in the axial direction. During use, the rotating shaft 41 and the roller 22 will rotate relative to each other. When the rotating shaft 41 rotates inside the roller 22, under the action of the internal thread 223 and the ball screw pair 411, the rotating shaft 41 can move in the axial direction inside the roller 22. Then, under the action of the sliding sleeve 43, the axial movement of the rotating shaft 41 will not drive the elastic element 42 to move, thus avoiding interference between them.

[0033] It should be noted that the axial movement of the roller 22 is limited by the mounting bracket 21 to prevent the roller 22 from also displacing in the axial direction.

[0034] Please see Figure 3 and Figure 4 The transmission mechanism 5 includes a driven wheel 51 fixedly connected to one end of the rotating shaft 41, and a driving wheel 52 frictionally engaged with one side of the driven wheel 51. The driven wheel 51 is disc-shaped, and the driving wheel 52 is frustoconical. The rotation axis of the driving wheel 52 is inclined relative to the rotation axis of the driven wheel 51, forming a certain angle. The generatrix of the conical surface on the side of the driving wheel 52 that contacts the driven wheel 51 is parallel to the rotation axis of the driven wheel 51, ensuring that the driven wheel 51 can always maintain contact with the driving wheel 52 when moving along its axis. The output end of the drive device 6 is connected to the driving wheel 52, driving it to rotate. The driving wheel 52 then drives the driven wheel 51 to rotate through friction, thereby sequentially driving the rotating shaft 41, the elastic element 42, and the roller 22 to rotate, and finally driving the plywood 3 to move through the conveyor belt 23.

[0035] In practical operation, when the friction between the new sanding belt and the plywood 3 is at its maximum, the elastic element 42 begins to store energy, and the rotating shaft 41 moves axially relative to the roller 22. Simultaneously, it drives the driven wheel 51 from the small-diameter engagement position to the large-diameter engagement position of the driving wheel 52. This process changes the transmission ratio between the driven wheel 51 and the driving wheel 52, increasing the rotational speed of the driven wheel 51, thereby accelerating the rotational speed of the rotating shaft 41, the elastic element 42, and the roller 22. This increases the moving speed of the plywood 3 on the conveyor belt 23 and shortens the travel time of the plywood 3. The sanding time effectively avoids excessive sanding caused by prolonged contact. When the old sanding belt sands the plywood 3, the friction between the sanding belt and the plywood 3 decreases, and the relative rotation angle between the rotating shaft 41 and the roller 22 decreases accordingly. The axial movement distance of the rotating shaft 41 is shortened, making the driven wheel 51 closer to the small diameter meshing position of the driving wheel 52. This change in transmission ratio reduces the speed of the driven wheel 51, thereby slowing down the movement speed of the plywood 3, extending the sanding time, and avoiding the problem of substandard processing quality due to insufficient sanding.

[0036] Please see Figure 3 Figure 4 Figure 3 A lifting frame 8 is provided on one side of the base 12. The drive device 6 is installed on the lifting frame 8 and a connecting arm 81 is fixed on one side. The output end of the drive device 6 passes through the connecting arm 81 and is connected to the drive wheel 52. The drive device 6 and the drive wheel 52 are lifted and lowered by the lifting frame 8, which can make the drive wheel 52 fit better with the driven wheel 51, thereby increasing the friction between the two and improving the transmission effect.

Claims

1. A plywood surface sanding device, comprising: The grinding body (1) and the conveying device (2), the conveying device (2) being used to carry and transport the plywood (3) and to transport the plywood (3) into the grinding body (1), the grinding body (1) being used to grind the surface of the plywood (3), characterized in that it further includes: The load feedback transmission mechanism (4) is installed on the conveying device (2) and is used to sense the load on the conveying device (2) when conveying the plywood (3); The speed change mechanism (5) is connected to the load feedback transmission mechanism (4); The drive unit (6) is connected to the load feedback transmission mechanism (4) through the speed change mechanism (5); When the transmission device (2) is subjected to a load, the load feedback transmission mechanism (4) adjusts the speed change mechanism (5) according to the sensed load size, so that the speed output of the drive device (6) to the transmission device (2) changes accordingly, thereby realizing the adaptive adjustment of the speed of the transmission device (2) with the load size.

2. The plywood surface sanding device according to claim 1, characterized in that: The conveying device (2) includes a mounting frame (21), rollers (22) rotatably mounted at both ends of the mounting frame (21), and a conveyor belt (23) sleeved on the rollers (22), with the plywood (3) placed on the conveyor belt (23).

3. The plywood surface sanding device according to claim 2, characterized in that: The load feedback transmission mechanism (4) is mounted on the roller (22), and includes a rotating shaft (41) passing through the inside of the roller (22) and an elastic element (42) disposed between the roller (22) and the rotating shaft (41). The rotating shaft (41) drives the roller (22) to rotate through the elastic element (42).

4. The plywood surface sanding device according to claim 3, characterized in that: The roller (22) has a through hole (221) along its axial direction. The inner wall of the through hole (221) is provided with an internal thread (223). The rotating shaft (41) is provided with a ball screw pair (411) that cooperates with the internal thread (223). When the rotating shaft (41) and the roller (22) rotate relative to each other, the rotating shaft (41) moves along the axial direction of the roller (22) under the cooperation of the internal thread (223) and the ball screw pair (411).

5. The plywood surface sanding device according to claim 4, characterized in that: The rotating shaft (41) is slidably fitted with a sliding sleeve (43). The rotating shaft (41) and the sliding sleeve (43) are connected by a keyway so that the sliding sleeve (43) can only slide along the axial direction of the rotating shaft (41) and rotate synchronously with the rotating shaft (41). One end of the elastic element (42) is connected to the roller (22), and the other end is connected to the sliding sleeve (43).

6. The plywood surface sanding device according to claim 3, characterized in that: The speed change mechanism (5) includes a driven wheel (51) fixedly connected to one end of the rotating shaft (41) and a driving wheel (52) that frictionally engages with the driven wheel (51). The output end of the drive device (6) is connected to the driving wheel (52), and the driving wheel (52) drives the driven wheel (51) to rotate through friction.

7. A plywood surface sanding device according to claim 6, characterized in that: The driven wheel (51) is disc-shaped, and the driving wheel (52) is frustoconical. The rotation axis of the driving wheel (52) is inclined relative to the rotation axis of the driven wheel (51), and the generatrix of the conical surface on the side of the driving wheel (52) that contacts the driven wheel (51) is parallel to the rotation axis of the driven wheel (51).

8. A plywood surface sanding device according to claim 7, characterized in that: It also includes a lifting frame (8), on which a drive unit (6) is mounted. The lifting frame (8) is used to adjust the height of the drive unit (6) so that the drive wheel (52) and the driven wheel (51) are in contact.

9. A plywood surface sanding device according to claim 3, characterized in that: The roller (22) has a receiving cavity (222) at both ends. An elastic element (42) is installed inside the receiving cavity (222). The opening end of the receiving cavity (222) is closed by the end cover (44). The rotating shaft (41) extends through the end cover (44) to the outside of the roller (22).

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