A sand implanting device and a sand implanting method for sand paper production

Abstract

The application discloses a sanding paper production sand-planting device and method, which comprises a sand-planting box, the two side walls of the sand-planting box are provided with through grooves for the passage of raw paper, the two side walls of the sand-planting box are provided with transmission rollers for driving the movement of the raw paper, the top of the sand-planting box is provided with a sand-planting mechanism, an image acquisition and identification mechanism and a sand supplementing mechanism arranged in sequence along the movement direction of the raw paper, the sand-planting mechanism is used for spraying abrasive grains on the surface of the raw paper, the image acquisition and identification mechanism is used for acquiring the surface image of the raw paper after the spraying of the abrasive grains and identifying the abrasive thin area in the surface image of the raw paper, and the sand supplementing mechanism is used for supplementing the spraying of the abrasive grains on the abrasive thin area on the surface of the raw paper, and the application has the advantages of accurate identification of the abrasive thin area, automatic sand supplementing, improved sand-planting uniformity and improved sanding paper product quality.

Description

Technical Field

[0001] This application relates to the field of sandpaper production technology, and in particular to a sand-planting device and sand-planting method for sandpaper production. Background Technology

[0002] Sandpaper, also known as abrasive paper, is a material used for grinding surfaces such as metal and wood to make them smooth and shiny. It is usually made by gluing various abrasive particles (i.e., abrasive materials) onto a base paper. Depending on the abrasive material, there are many types, such as alumina sandpaper, diamond sandpaper, artificial diamond sandpaper, and glass sandpaper.

[0003] Currently, sandpaper production generally employs electrostatic abrasive coating. Electrostatic abrasive coating utilizes a high-voltage electrostatic field and the electrical properties of the abrasive to make it a charged material, which is then adsorbed onto a base paper coated with a binder, forming sandpaper with excellent grinding performance. Abrasive coating equipment is required during the coating process. However, existing equipment is affected by factors such as equipment and environment, resulting in uneven abrasive distribution on the base paper. Currently, manual visual inspection is used to detect areas with sparse abrasive coating on the base paper. Then, some abrasive is manually added to these areas to improve the uniformity of abrasive distribution and thus improve product quality. However, this method is heavily influenced by human judgment, has low accuracy in identifying sparse abrasive areas, and is prone to over- or under-addition of abrasive, making it difficult to guarantee uniformity. Summary of the Invention

[0004] The main purpose of this application is to provide a sand-planting device and method for sandpaper production, which aims to solve the technical problem that existing sand-planting devices are unable to accurately identify areas with sparse abrasive planting on the base paper and automatically replenish them.

[0005] To achieve the above objectives, this application provides a sand-planting device for sandpaper production, including a sand-planting box. The sand-planting box has through slots on both sides for the passage of raw paper. Transmission rollers for moving the raw paper are installed on both sides of the sand-planting box. A sand-planting mechanism, an image acquisition and recognition mechanism, and a sand-replenishing mechanism are arranged sequentially along the direction of the raw paper's movement at the top of the sand-planting box. The sand-planting mechanism is used to spray abrasive particles onto the surface of the raw paper. The image acquisition and recognition mechanism is used to acquire an image of the raw paper surface after the abrasive particles have been sprayed and to identify areas of sparse abrasive in the image. The sand-replenishing mechanism is used to replenish the abrasive particles sprayed onto the sparse abrasive areas on the surface of the raw paper.

[0006] Optionally, the sand replenishment mechanism includes a slide rail located at the top of the sand-planting box. The length direction of the slide rail is perpendicular to the direction of movement of the base paper. A slide block is slidably connected to the bottom of the slide rail. A drive component for moving the slide block is also provided at the top of the sand-planting box. A first storage bin for storing grinding sand particles is connected to the bottom of the slide block. A cylindrical first discharge bin is connected to the bottom of the first storage bin. A rotatable first feeding component is provided inside the first discharge bin. A first discharge pipe, which is a rectangular pipe, is connected to the bottom of the first discharge bin.

[0007] Optionally, the drive assembly includes a transmission screw threaded through the slide, with a first motor and a bearing housing connected to both ends of the transmission screw, and both the first motor and the bearing housing being fixedly installed at the top inside the sand planting box.

[0008] Optionally, the first feeding assembly includes a rotating shaft, one end of which is movably connected to the inner wall of the first discharge bin, and the other end of which is connected to a second motor located on the outer wall of the first discharge bin. A movable roller is fixedly sleeved on the rotating shaft, and multiple feeding blades are provided on the outer wall of the movable roller. The multiple feeding blades are arranged in a ring array around the axis of the movable roller, and the ends of the feeding blades are attached to or close to the inner wall of the first discharge bin.

[0009] Optionally, two inner sidewalls along the length of the first discharge pipe are hinged with movable plates, and compression springs are connected between the movable plates and the inner wall of the first discharge pipe. The distance between the bottoms of the two movable plates is the discharge width. Both movable plates are connected to a traction mechanism, which is used to pull the movable plates to rotate in order to adjust the size of the discharge width.

[0010] Optionally, the traction mechanism includes a traction rope connected to the bottom of the movable plate, the traction rope being connected to a telescopic cylinder located outside the first discharge pipe, and a traction wheel cooperating with the traction rope being provided at the bottom of the first discharge pipe.

[0011] Optionally, the image acquisition and recognition mechanism includes a connecting frame connected to the top of the sand-planting box, with an industrial camera and supplementary lights located on both sides of the industrial camera at the bottom of the connecting frame. The industrial camera is used to acquire and recognize images of the surface of the raw paper.

[0012] Optionally, the sand planting mechanism includes a second storage bin for storing grinding sand particles located at the top of the sand planting box. The bottom of the second storage bin is connected to a cylindrical second discharge bin. The second discharge bin is equipped with a rotatable second feeding component. The second feeding component has the same structure as the first feeding component. The bottom of the second discharge bin is connected to a second discharge pipe, which is a rectangular pipe.

[0013] To achieve the above objectives, this application also provides a sand planting method, based on the aforementioned sand planting apparatus for sandpaper production, comprising the following steps:

[0014] Start the drive roller to move the base paper;

[0015] Abrasive particles are applied to the surface of the base paper by a sand-planting mechanism, and an image of the base paper surface after the abrasive particles are sprayed is captured by an image acquisition and recognition mechanism.

[0016] Identify abrasive-sparse areas in the surface image of the original paper and determine the contour information of these abrasive-sparse areas;

[0017] Based on the contour information, obtain the adjustment and operation information of the sand replenishment mechanism;

[0018] According to the adjusted operating information, the drive component drives the slide to slide to the corresponding position so that the center of the first discharge pipe is aligned with the center line of the abrasive thin area. The traction mechanism pulls the movable plate to rotate so as to adjust the discharge width of the first discharge pipe. Then, the first feeding component rotates so that the abrasive particles flow out from the first discharge pipe and are sprayed on the abrasive thin area.

[0019] Optionally, based on the contour information, the adjustment and operation information of the sand replenishment mechanism is obtained, including:

[0020] A reference rectangle is constructed based on the abrasive sparse region; the reference rectangle is the smallest rectangle that selects the abrasive sparse region.

[0021] Obtain the center line, width, and length of the reference rectangle; wherein, the center line of the reference rectangle is parallel to the direction of paper movement, and the width direction of the reference rectangle is perpendicular to the direction of paper movement.

[0022] The center line of the reference rectangle is output as the center line of the abrasive sparse area, the width of the reference rectangle is output as the discharge width, and the rotation time of the first feeding component is obtained according to the length of the reference rectangle.

[0023] The beneficial effects that this application can achieve are as follows:

[0024] When the drive roller moves the base paper at a certain speed, the abrasive coating mechanism coats the surface of the base paper with abrasive particles. Through electrostatic action, the abrasive particles are adsorbed onto the base paper coated with adhesive. As the base paper coated with abrasive particles continues to move below the image acquisition and recognition mechanism, the image acquisition and recognition mechanism acquires an image of the base paper surface after the abrasive particles have been sprayed. Using machine vision recognition technology, the abrasive sparse areas in the base paper surface image can be accurately identified, reducing human error. At the same time, the abrasive replenishment mechanism can automatically replenish the abrasive sparse areas on the base paper surface, reducing the unevenness of manual abrasive replenishment operations. Ultimately, it achieves accurate identification and automatic replenishment of abrasive sparse areas on the base paper, improving the uniformity of abrasive coating and thus improving product quality. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0026] Figure 1 This is a schematic diagram of a sand-planting device and sand-planting method for sandpaper production according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram (side view) of the connection structure between the sand replenishment mechanism and the top of the sand planting box in an embodiment of this application.

[0028] Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of the first feeding component in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of constructing a reference rectangle based on the surface image of the original paper in an embodiment of this application.

[0031] Figure label:

[0032] 110-Sand planting box, 120-Base paper, 130-Drive roller, 140-Sand planting mechanism, 141-Second storage bin, 142-Second discharge bin, 143-Second feeding assembly, 144-Second discharge pipe, 150-Image acquisition and recognition mechanism, 151-Connecting frame, 152-Industrial camera, 153-Supplemental light, 160-Sand replenishment mechanism, 161-Slide rail, 162-Slide base, 163-First storage bin, 164- First discharge bin, 165-First feeding assembly, 1651-Rotating shaft, 1652-Moving roller, 1653-Feeding blade, 166-First discharge pipe, 170-Drive assembly, 171-Transmission screw, 172-First motor, 173-Bearing seat, 180-Second motor, 190-Moving plate, 210-Compression spring, 220-Traction mechanism, 221-Traction rope, 222-Telescopic cylinder, 223-Traction wheel.

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0038] Example 1

[0039] Reference Figures 1-5This embodiment provides a sand-planting device for sandpaper production, including a sand-planting box 110. The sand-planting box 110 has through slots on both sides for the passage of raw paper 120. The sand-planting box 110 has transmission rollers 130 on both sides for moving the raw paper 120. The top of the sand-planting box 110 is provided with a sand-planting mechanism 140, an image acquisition and recognition mechanism 150 and a sand-replenishing mechanism 160 arranged sequentially along the moving direction of the raw paper 120. The sand-planting mechanism 140 is used to spray abrasive particles onto the surface of the raw paper 120. The image acquisition and recognition mechanism 150 is used to acquire an image of the surface of the raw paper 120 after spraying abrasive particles and identify the areas with sparse abrasive particles in the image of the surface of the raw paper 120. The sand-replenishing mechanism 160 is used to replenish the areas with sparse abrasive particles on the surface of the raw paper 120 by spraying abrasive particles.

[0040] In this embodiment, when the transmission roller 130 drives the base paper 120 to move at a certain speed, the sand-planting mechanism 140 sprays abrasive particles onto the surface of the base paper 120 below. Through electrostatic action, the abrasive particles are adsorbed onto the base paper 120 coated with adhesive. When the base paper 120 after being sprayed with abrasive particles continues to move below the image acquisition and recognition mechanism 150, the image acquisition and recognition mechanism 150 acquires an image of the surface of the base paper 120 after being sprayed with abrasive particles. Using machine vision recognition technology, the thin areas of abrasive particles in the image of the surface of the base paper 120 can be accurately identified, reducing human error. At the same time, the sand-replenishing mechanism 160 can automatically replenish the thin areas of abrasive particles on the surface of the base paper 120, reducing the unevenness of manual sand-replenishing operations. Finally, the accurate identification and automatic replenishment of thin areas of abrasive particles on the base paper 120 are achieved, improving the uniformity of abrasive sand-planting and thus improving product quality.

[0041] It should be noted that an electrostatic device is installed at the bottom of the sand planting box 110, located below the base paper 120. The electrostatic device includes an electrostatic box, with multiple conductive columns connected to the top of the electrostatic box. An electrostatic plate is connected to the top of the conductive columns. The electrostatic plate generates an electrostatic field through the electrostatic box to achieve electrostatic sand planting.

[0042] As an optional implementation, the sand replenishment mechanism 160 includes a slide rail 161 disposed at the top of the sand planting box 110. The length direction of the slide rail 161 is perpendicular to the moving direction of the base paper 120. A slide seat 162 is slidably connected to the bottom of the slide rail 161. A drive assembly 170 for driving the slide seat 162 to slide is also disposed at the top of the sand planting box 110. A first storage bin 163 for storing grinding sand particles is connected to the bottom of the slide seat 162. A cylindrical first discharge bin 164 is connected to the bottom of the first storage bin 163. A rotatable first feeding assembly 165 is disposed inside the first discharge bin 164. A first discharge pipe 166 is connected to the bottom of the first discharge bin 164. The first discharge pipe 166 is a rectangular tube.

[0043] In this embodiment, when it is necessary to replenish the abrasive sand in the sparse areas on the base paper 120, since the specific location of the sparse abrasive areas may be different, the center position of the sparse abrasive areas can be further identified based on the surface image of the base paper 120. Then, the sliding block 162 and its lower accessories are moved synchronously by the driving component 170, so that the center of the first discharge pipe 166 can be aligned with the center position of the sparse abrasive area. When the sparse abrasive area moves to the bottom of the first discharge pipe 166, the first feeding component 165 rotates to allow the abrasive sand particles in the first storage bin 163 to enter the first discharge bin 164, and finally spray out from the first discharge pipe 166, so that the sprayed abrasive sand particles can fully cover the sparse abrasive area, while minimizing the repeated sanding of areas outside the sparse abrasive area, and further improving the uniformity of abrasive sanding.

[0044] It should be noted that when the sand spraying is completed, the first feeding component 165 stops rotating, thereby sealing the opening between the first storage bin 163 and the first discharge bin 164. The abrasive particles in the first discharge bin 164 also stop flowing, thus stopping the sand spraying.

[0045] As an optional implementation, the drive assembly 170 includes a transmission screw 171 threaded through the slide block 162. The two ends of the transmission screw 171 are respectively connected to a first motor 172 and a bearing seat 173. The first motor 172 and the bearing seat 173 are both fixedly installed at the top of the sand planting box 110.

[0046] In this embodiment, when the position of the slide block 162 needs to be adjusted, the first motor 172 starts and drives the transmission screw 171 to rotate, thereby driving the slide block 162 to slide along the slide rail 161. By rotating the first motor 172 forward and reverse, the slide block 162 can be moved left and right, so that the slide block 162 can be accurately moved to the corresponding position. The bearing seat 173 supports the transmission screw 171 and cooperates with its rotation.

[0047] As an optional implementation, the first feeding assembly 165 includes a rotating shaft 1651. One end of the rotating shaft 1651 is movably connected to the inner wall of the first discharge bin 164, and the other end of the rotating shaft 1651 is connected to a second motor 180 located on the outer wall of the first discharge bin 164. A movable roller 1652 is fixedly sleeved on the rotating shaft 1651. A plurality of feeding blades 1653 are provided on the outer wall of the movable roller 1652. The plurality of feeding blades 1653 are arranged in a ring array around the axis of the movable roller 1652, and the ends of the feeding blades 1653 are attached to or close to the inner wall of the first discharge bin 164.

[0048] In this embodiment, when material needs to be discharged, the second motor 180 drives the rotating shaft 1651 and the movable roller 1652 to rotate, thereby driving the discharge blade 1653 to rotate. At this time, the grinding sand particles in the first storage bin 163 enter the first discharge bin 164. Simultaneously, under the action of the discharge blade 1653, the grinding sand particles in the first discharge bin 164 are stirred into the first discharge pipe 166, realizing automatic discharge. When the rotating shaft 1651 and the movable roller 1652 stop rotating, the discharge blade 1653 plays a blocking role, so that the grinding sand particles in the first discharge bin 164 no longer flow, thereby stopping the discharge.

[0049] As an optional implementation, movable plates 190 are hinged to both inner sidewalls of the first discharge pipe 166 along its length. A compression spring 210 is connected between the movable plates 190 and the inner wall of the first discharge pipe 166. The distance between the bottoms of the two movable plates 190 is the discharge width. Both movable plates 190 are connected to a traction mechanism 220, which is used to pull the movable plates 190 to rotate in order to adjust the size of the discharge width.

[0050] In this embodiment, since the abrasive sparse areas may vary in size, to further reduce repeated sand application to areas outside the abrasive sparse areas, this embodiment uses two rotatably adjustable movable plates 190. Under no tension, the distance between the two movable plates 190 is minimized under the support of the compression spring 210, resulting in the minimum discharge width. If the width of the abrasive sparse area is detected to be less than the minimum discharge width, the minimum distance between the two movable plates 190 under no tension is maintained. If the width of the abrasive sparse area is detected to be greater than the minimum discharge width, the movable plates 190 can be rotated via the traction mechanism 220, increasing the distance between the two movable plates 190. This adjusts the discharge width to match the width of the abrasive sparse area, ensuring that the abrasive particles are primarily applied only within the abrasive sparse area, thereby reducing repeated sand application to areas outside the abrasive sparse area and further improving the uniformity of sand application.

[0051] As an optional implementation, the traction mechanism 220 includes a traction rope 221 connected to the bottom of the movable plate 190. The traction rope 221 is connected to a telescopic cylinder 222 located outside the first discharge pipe 166. The bottom of the first discharge pipe 166 is provided with a traction wheel 223 that cooperates with the traction rope 221.

[0052] In this embodiment, when it is necessary to adjust the distance between the two movable plates 190, the two telescopic cylinders 222 simultaneously retract, pulling the traction rope 221. The traction rope 221 exerts a pulling force on the bottom of the movable plates 190, causing the two movable plates 190 to rotate simultaneously until the distance between the two movable plates 190 reaches the width of the abrasive thinning region, thus achieving automatic adjustment and ensuring adjustment accuracy. It should be noted that the traction wheel 223 can reduce the wear caused by the traction rope 221 directly contacting the bottom of the first discharge pipe 166, preventing the traction rope 221 from breaking.

[0053] As an optional implementation, the image acquisition and recognition mechanism 150 includes a connecting frame 151 connected to the top of the sand-planting box 110. An industrial camera 152 and supplementary lights 153 located on both sides of the industrial camera 152 are provided at the bottom of the connecting frame 151. The industrial camera 152 is used to acquire and recognize the surface image of the base paper 120.

[0054] In this embodiment, the industrial camera 152 has built-in image processing software that can acquire and recognize images of the surface of the raw paper 120. The supplementary light 153 is used to illuminate the surface of the raw paper 120 to ensure the clarity of the image acquisition. A controller can be set here. The telescopic cylinder 222, the first motor 172 and the second motor 180 are all electrically connected to the controller. The controller controls the corresponding electrical components to perform corresponding operations based on the image recognition results.

[0055] As an optional implementation, the sand planting mechanism 140 includes a second storage bin 141 for storing grinding sand particles disposed at the top of the sand planting box 110. The bottom of the second storage bin 141 is connected to a cylindrical second discharge bin 142. The second discharge bin 142 is provided with a rotatable second feeding assembly 143. The second feeding assembly 143 has the same structure as the first feeding assembly 165. The bottom of the second discharge bin 142 is connected to a second discharge pipe 144, which is a rectangular tube.

[0056] In this embodiment, the sand planting mechanism 140 and the sand replenishment mechanism 160 operate on the same principle. The material can be discharged by rotating the second feeding component 143, which will not be described in detail here.

[0057] Example 2

[0058] Reference Figures 1-5 This embodiment provides a sand-planting method based on the aforementioned sand-planting device for sandpaper production, comprising the following steps:

[0059] Start the drive roller 130 to move the base paper 120;

[0060] Abrasive particles are applied to the surface of the base paper 120 by the abrasive particle application mechanism 140, and the image of the surface of the base paper 120 after the abrasive particles are applied is captured by the image acquisition and recognition mechanism 150.

[0061] Identify abrasive-sparse regions in the surface image of the base paper 120 and determine the contour information of these regions.

[0062] Based on the contour information, obtain the adjustment and operation information of the sand replenishment mechanism 160;

[0063] According to the adjusted operating information, the drive component 170 drives the slide 162 to slide to the corresponding position so that the center of the first discharge pipe 166 is aligned with the center line of the abrasive thin area. The traction mechanism 220 pulls the movable plate 190 to rotate so as to adjust the discharge width of the first discharge pipe 166. Then, the first feeding component 165 is rotated so that the abrasive particles flow out from the first discharge pipe 166 and are sprayed on the abrasive thin area.

[0064] In this embodiment, when the drive roller 130 drives the base paper 120 to move, abrasive particles are first sprayed onto the surface of the base paper 120 by the abrasive coating mechanism 140, and an image of the surface of the base paper 120 after the abrasive particles are sprayed is acquired by the image acquisition and recognition mechanism 150. Then, the abrasive sparse areas in the image of the base paper 120 surface are identified, and the contour information of the abrasive sparse areas is identified. The contour information may include the position and size information of the abrasive sparse areas, etc. Finally, the adjustment and operation information of the corresponding abrasive replenishment mechanism 160 can be matched, and at this time, the drive component 1 can be used to adjust the operation. 70 drives the slide block 162 to slide to the corresponding position so that the center of the first discharge pipe 166 is aligned with the center line of the abrasive sparse area. The traction mechanism 220 pulls the movable plate 190 to rotate to adjust the discharge width of the first discharge pipe 166. Then, the first feeding assembly 165 rotates so that the abrasive particles flow out from the first discharge pipe 166 and are sprayed on the abrasive sparse area. This allows the sprayed abrasive particles to fully cover the abrasive sparse area, while minimizing the need for repeated abrasive application to areas outside the abrasive sparse area, further improving the uniformity of abrasive application.

[0065] As an optional implementation, the adjustment and operation information of the sand replenishment mechanism 160 is obtained based on the contour information, including:

[0066] A reference rectangle is constructed based on the abrasive sparse region; the reference rectangle is the smallest rectangle that selects the abrasive sparse region.

[0067] Obtain the center line, width, and length of the reference rectangle; wherein, the center line of the reference rectangle is parallel to the moving direction of the original paper 120, and the width direction of the reference rectangle is perpendicular to the moving direction of the original paper 120.

[0068] The center line of the reference rectangle is output as the center line of the abrasive sparse area, the width of the reference rectangle is output as the discharge width, and the rotation time of the first feeding component 165 is obtained according to the length of the reference rectangle.

[0069] In this embodiment, a minimum rectangle, i.e. a reference rectangle, can be constructed to select the abrasive sparse area. Based on this reference rectangle, the corresponding center line, width a, and length b can be identified. Based on the center line, control information that needs to be adjusted to move the slide 162 to the corresponding position can be generated. Width a is the discharge width, thereby ensuring that repeated sanding in areas outside the abrasive sparse area is minimized. At the same time, based on length b and the moving speed of the base paper 120, the sand replenishment time for the abrasive sparse area can be calculated, i.e., the rotation time of the first feeding component 165. Based on the above information, the adjustment operation information is finally generated.

[0070] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A sand-planting device for sandpaper production, characterized in that, The device includes a sand-planting box, with through slots on both sides of the sand-planting box for the passage of raw paper. The side walls of the sand-planting box are equipped with transmission rollers for moving the raw paper. The top of the sand-planting box is equipped with a sand-planting mechanism, an image acquisition and recognition mechanism, and a sand-replenishing mechanism arranged sequentially along the direction of the raw paper movement. The sand-planting mechanism is used to spray abrasive particles onto the surface of the raw paper. The image acquisition and recognition mechanism is used to acquire an image of the surface of the raw paper after spraying abrasive particles and identify areas with sparse abrasive particles in the image of the raw paper surface. The sand-replenishing mechanism is used to spray abrasive particles onto the areas with sparse abrasive particles on the surface of the raw paper. The sand replenishment mechanism includes a slide rail disposed at the top of the sand-planting box. The length direction of the slide rail is perpendicular to the direction of movement of the original paper. A sliding base is slidably connected to the bottom of the slide rail. A drive assembly for moving the sliding base is also disposed at the top of the sand-planting box. A first storage bin for storing grinding sand particles is connected to the bottom of the sliding base. A cylindrical first discharge bin is connected to the bottom of the first storage bin. A rotatable first feeding assembly is disposed inside the first discharge bin. A first discharge pipe, which is rectangular, is connected to the bottom of the first discharge bin. Movable plates are hinged to the two inner sidewalls of the first discharge pipe along its length. Compression springs are connected between the movable plates and the inner walls of the first discharge pipe. The distance between the bottoms of the two movable plates is the discharge width. A traction mechanism is connected to both movable plates. The traction mechanism is used to pull the movable plates to rotate, thereby adjusting the size of the discharge width.

2. The sand-planting device for sandpaper production as described in claim 1, characterized in that, The drive assembly includes a transmission screw threaded through the slide block, with a first motor and a bearing housing connected to both ends of the transmission screw, and both the first motor and the bearing housing are fixedly installed at the top of the sand planting box.

3. The sand-planting device for sandpaper production as described in claim 1, characterized in that, The first feeding assembly includes a rotating shaft. One end of the rotating shaft is movably connected to the inner wall of the first discharge chamber, and the other end of the rotating shaft is connected to a second motor located on the outer wall of the first discharge chamber. A movable roller is fixedly sleeved on the rotating shaft. Multiple feeding blades are provided on the outer wall of the movable roller. The multiple feeding blades are arranged in a circular array around the axis of the movable roller, and the ends of the feeding blades are attached to or close to the inner wall of the first discharge chamber.

4. The sand-planting device for sandpaper production as described in claim 1, characterized in that, The traction mechanism includes a traction rope connected to the bottom of the movable plate, the traction rope being connected to a telescopic cylinder located outside the first discharge pipe, and a traction wheel cooperating with the traction rope being provided at the bottom of the first discharge pipe.

5. A sand-planting device for sandpaper production as described in claim 1, characterized in that, The image acquisition and recognition mechanism includes a connecting frame connected to the top of the sand-planting box. An industrial camera and supplementary lights located on both sides of the industrial camera are provided at the bottom of the connecting frame. The industrial camera is used to acquire and recognize images of the surface of the raw paper.

6. A sand-planting device for sandpaper production as described in claim 1 or 3, characterized in that, The sand planting mechanism includes a second storage bin for storing grinding sand particles located at the top of the sand planting box. The bottom of the second storage bin is connected to a cylindrical second discharge bin. The second discharge bin is equipped with a rotatable second feeding component. The second feeding component has the same structure as the first feeding component. The bottom of the second discharge bin is connected to a second discharge pipe, which is a rectangular tube.

7. A method for planting sand, characterized in that, A sand-planting device for sandpaper production as described in claim 1 or 4 includes the following steps: The drive roller is activated to move the base paper. The sand-planting mechanism plants abrasive particles onto the surface of the base paper, and the image acquisition and recognition mechanism acquires an image of the base paper surface after the abrasive particles have been sprayed. Identify the abrasive-sparse areas in the image of the original paper surface, and identify the contour information of the abrasive-sparse areas; Based on the contour information, obtain the adjustment and operation information of the sand replenishment mechanism; According to the adjusted operating information, the drive component drives the slide to slide to the corresponding position so that the center of the first discharge pipe is aligned with the center line of the abrasive thin area. The traction mechanism pulls the movable plate to rotate so as to adjust the discharge width of the first discharge pipe. Then, the first feeding component rotates so that the abrasive particles flow out from the first discharge pipe and are sprayed onto the abrasive thin area.

8. The sand-planting method as described in claim 7, characterized in that, The step of obtaining the adjustment and operation information of the sand-filling mechanism based on the contour information includes: Based on the abrasive sparse region, a reference rectangle is constructed; wherein, the reference rectangle is the smallest rectangle that selects the abrasive sparse region; Obtain the center line, width, and length of the reference rectangle; wherein the center line of the reference rectangle is parallel to the direction of paper movement, and the width direction of the reference rectangle is perpendicular to the direction of paper movement. The center line of the reference rectangle is output as the center line of the abrasive sparse region, the width of the reference rectangle is output as the discharge width, and the rotation time of the first feeding component is obtained according to the length of the reference rectangle.

Images