An automatic sandpaper tearing device and method

Abstract

This invention discloses an automatic sandpaper tearing device and method, relating to the field of sanding equipment technology. The automatic sandpaper tearing device includes a sandpaper tearing platform, a negative pressure suction chamber, and a tearing line. The negative pressure suction chamber is installed under the sandpaper tearing platform, and a distance measuring column for measuring the distance to the sandpaper is provided inside the negative pressure suction chamber. Locking mechanisms are connected to both ends of the tearing line, and the locking mechanisms are installed on a slide rail assembly. The slide rail assembly is used to drive the tearing line to move back and forth in the horizontal direction to tear the sandpaper. This invention solves the problem of sandpaper tearing failure caused by different sandpaper and sanding disc conditions by combining precise distance reading, reciprocating tearing, and negative pressure peeling, ensuring the stability and reliability of sandpaper replacement.

Description

Technical Field

[0001] This invention relates to the field of sanding equipment technology, and in particular to an automatic sandpaper tearing device and method. Background Technology

[0002] In robotic automated sanding operations, sandpaper, as a consumable, needs to be replaced regularly. Depending on the sanding product and sandpaper grade, the sandpaper replacement frequency can be as high as once every 2 minutes. To improve the efficiency of automated operations, automated mechanisms are often used to perform sandpaper replacement. In existing automatic sandpaper replacement systems, although the sandpaper tearing device can peel off the sandpaper, it suffers from problems such as low success rate and damage to the sanding disc. In particular, when the edges of the used sandpaper are prone to curling, folding, wear, or when the sanding disc is compressed and deformed, the existing sandpaper tearing device cannot effectively tear off the sandpaper.

[0003] For example, CN107199508A discloses an intelligent sandpaper replacement device for robotic grinding and polishing, including a sandpaper removal device and a sandpaper adhesion device. The sandpaper removal device includes a cutting plate, a parallel bearing mechanism, and a frame structure. The sandpaper adhesion device includes a pattern storage mechanism, a detection mechanism, and a slider guide mechanism. The pattern storage mechanism includes a sandpaper retaining ring, a lower support plate, a support rod, a tray, and a mounting plate. This solution has the problem that the cutting plate may get stuck on the grinding disc, causing destructive damage to the grinding disc. It also has the problem that the cutting plate cuts into the sandpaper surface, making it impossible to effectively tear off the sandpaper. CN110576390A discloses a sandpaper replacement device for injection molding part grinding equipment, including a support mounting plate. A recycling device is provided at the bottom of the support mounting plate, and a receiving cylinder is provided at the top of the support mounting plate. A sensor is installed on the left side wall of the receiving cylinder, and a replacement column is vertically fixed to the right side. A peeling claw is installed on the left side wall of the replacement column. However, the peeling claw still has the problem of damaging the grinding disc and failing to peel off the sandpaper. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an automatic sandpaper tearing device and method. By combining precise distance reading, reciprocating tearing and negative pressure peeling, the problem of sandpaper tearing failure caused by different sandpaper and grinding disc working conditions is solved, ensuring the stability and reliability of sandpaper replacement.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] In a first aspect, the present invention provides an automatic sandpaper tearing device, comprising:

[0007] Sandpaper tearing platform;

[0008] A negative pressure paper suction chamber is installed on the lower side of the sandpaper tearing platform. The negative pressure paper suction chamber is equipped with a distance measuring column for measuring the distance of the sandpaper.

[0009] The tearing thread has locking mechanisms connected to both ends. The locking mechanisms are mounted on a slide rail assembly, which drives the tearing thread to move back and forth in the horizontal direction to tear sandpaper.

[0010] As a further implementation, the slide rail assembly is connected to a lifting mechanism, which is used to adjust the tearing height according to the sandpaper distance.

[0011] As a further implementation, at least two ranging columns are provided along the inner wall of the negative pressure suction chamber, and the center of the ranging column and the center of the negative pressure suction chamber are located on the same horizontal line.

[0012] As a further implementation, the ranging post includes a column body, and a distance sensor is mounted on the top of the column body.

[0013] As a further implementation, slide rail assemblies are symmetrically arranged on both sides of the negative pressure suction chamber, and the direction of the slide rail assemblies is perpendicular to the tear line direction.

[0014] As a further implementation, the suction port and sidewall of the negative pressure suction chamber are both provided with several negative pressure holes.

[0015] The side wall of the negative pressure paper suction chamber is connected to an air suction port, which is used to connect to an air extraction device.

[0016] As a further implementation, a calibration track is provided on one side of the negative pressure suction chamber. The calibration track is used to calibrate the position of the grinding disc so that the grinding disc is aligned with the negative pressure suction chamber.

[0017] Secondly, the present invention also provides an automatic sandpaper tearing method, employing the aforementioned automatic sandpaper tearing device, comprising:

[0018] After the sanding head is placed on the upper side of the negative pressure paper suction chamber, the sandpaper is attracted by the negative pressure.

[0019] A distance measuring column is used to measure the distance to sandpaper.

[0020] The tear line moves from the first side of the negative pressure suction chamber to the second side, and then from the second side to the first side, tearing the sandpaper by moving back and forth along the tear line.

[0021] The torn sandpaper is sucked into the negative pressure suction chamber.

[0022] As a further implementation, when the distance between the sandpaper measured by the distance measuring column and the normal sandpaper distance is greater than the minimum threshold, the tearing height is adjusted by the lifting mechanism.

[0023] As a further implementation, the normal sandpaper distances measured by the two distance measuring columns are D1 and D2, respectively, and the deformed sandpaper distances measured by the two distance measuring columns are d1 and d2, respectively.

[0024] Where d = D1 - d1 or d = D2 - d2;

[0025] d is the difference between the normal sandpaper distance and the deformed sandpaper distance measured by any distance measuring column, and m is the minimum threshold. When d > m, the lifting mechanism is activated to adjust the tear line position.

[0026] As a further implementation, during the initial operation, the tear line moves to the first side via the slide rail assembly, and the grinding head moves from the second side to the upper side of the negative pressure suction compartment via the correction track.

[0027] The beneficial effects of the present invention are as follows:

[0028] (1) The tear line of the present invention can tear sandpaper back and forth under the action of the locking mechanism and the slide rail assembly, so as to achieve effective peeling of sandpaper; and with the help of negative pressure, before the sandpaper tearing operation, the effective negative pressure can provide effective tension to the sandpaper, so that the subsequent tear line can enter between the sandpaper and the grinding disc more easily. At the same time, when the sandpaper tearing operation is performed, the negative pressure can peel the sandpaper at the position where the tear line passes in a timely and effective manner; after the sandpaper tearing operation is completed, the sandpaper is directly sucked into the bottom of the negative pressure suction box through the negative pressure, avoiding the impact on the next sandpaper tearing operation.

[0029] (2) The present invention sets a distance measuring column in the negative pressure suction chamber. The distance measuring column measures the distance of the sandpaper based on the distance sensor. By measuring the distance of the sandpaper in normal state and deformed state, and comparing it with the minimum threshold, the corresponding difference is obtained. The tear line height is finely adjusted according to the difference to ensure that the tear line can smoothly enter between the grinding disc and the sandpaper. Attached Figure Description

[0030] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative examples and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention.

[0031] Figure 1 This is an isometric view of the present invention according to one or more embodiments;

[0032] Figure 2 This is a top view of the present invention according to one or more embodiments;

[0033] Figure 3 This is a side view of the present invention according to one or more embodiments.

[0034] Among them, 1-grinding head, 2-sandpaper tearing platform, 3-slide rail, 4-locking mechanism, 5-tear line, 6-correction rail, 7-negative pressure suction paper compartment, 8-negative pressure hole, 9-distance measuring column, 10-air suction port, 11-lifting mechanism. Detailed Implementation

[0035] For ease of description, the terms "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Example 1:

[0037] This embodiment provides an automatic sandpaper tearing device that combines precise distance reading, reciprocating tearing, and negative pressure peeling to solve the problem of sandpaper tearing failure caused by different sandpaper and grinding disc conditions, thereby ensuring the stability and reliability of sandpaper replacement; Figures 1-3 As shown, the automatic sandpaper tearing device mainly includes a sandpaper tearing platform 2, a negative pressure suction chamber 7, a tear line 5, a locking mechanism 4, and a slide rail assembly. The sandpaper tearing platform 2 serves as a support platform, and the negative pressure suction chamber 7 is fixed to the lower side of the sandpaper tearing platform 2. The two ends of the tear line 5 are connected to the locking mechanism 4, which tensions the tear line 5. The locking mechanism 4 is installed on the upper side of the slide rail assembly, and the movement of the tear line 5 is achieved through the slide rail assembly.

[0038] In the horizontal plane, the slide rail assembly is set in the transverse direction, and the tear line 5 is set in the longitudinal direction, that is, the tear line 5 can move in a direction perpendicular to its tensioning direction.

[0039] Specifically, such as Figure 2 and Figure 3 As shown, the slide rail assemblies are symmetrically arranged on both sides of the negative pressure suction chamber 7. The distance between the two slide rail assemblies is greater than the outer diameter of the negative pressure suction chamber 7 to ensure that the length of the tear line 5 is greater than the length of the sandpaper. In order to achieve fine adjustment of the height of the tear line 5, a lifting mechanism 11 is also provided on the lower side of the sandpaper tearing platform 2. In this embodiment, a lifting mechanism 11 is connected to each end of the slide rail assembly to ensure that the slide rail assembly remains balanced while adjusting the position of the tear line 5.

[0040] The sandpaper tearing platform 2 has a mounting slot for installing the slide rail assembly. Similarly, the mounting slot also facilitates the adjustment of the slide rail assembly. The lifting mechanism 11 can be any mechanism that can provide linear motion. For example, the lifting mechanism 11 can be a cylinder, with the cylinder body fixed to the sandpaper tearing platform 2 via a connecting plate; or, the lifting mechanism 11 can be a hydraulic cylinder, etc.

[0041] The slide rail assembly includes a slide rail 3 and a slider mounted on the slide rail 3; a locking mechanism 4 is fixed on the slider. The locking mechanism 4 can clamp the end of the tear line 5. The locking mechanism 4 can be implemented by locking nuts, grippers, etc., which can be selected according to actual requirements, as long as the tear line 5 can be effectively fixed.

[0042] The surface of the tear line 5 is relatively smooth. The tension of the tear line 5 can be adjusted by the locking mechanisms 4 on both sides, and the height of the tear line 5 can be adjusted by the slide rail assembly and the lifting mechanism 11. In this embodiment, the diameter of the tear line 5 is less than 0.5mm, which can effectively enter between the sandpaper and the grinding disc. Even if the edge of the sandpaper is folded or worn, it will not affect the entry of the tear line 5 between the sandpaper and the grinding disc.

[0043] according to Figure 2 As shown, the slide rail assembly is located on the front and rear sides of the negative pressure suction chamber 7. A correction track 6 is located on the left side of the negative pressure suction chamber 7. There are two correction tracks 6, forming a correction area between them. The left section of the correction track 6 is inclined, and the right section is horizontal. The inclined section of the correction track 6 gradually reduces the correction area from left to right. The distance between the horizontal sections is consistent with the width of the grinding disc at the end of the grinding head 1. When performing sandpaper tearing operations, since the grinding disc at the end of the grinding head 1 is generally an eccentric disc, the grinding head 1 first fully conforms to the surface of the sandpaper tearing platform 2 and enters from the left side of the correction track 6 to correct the position of the grinding disc, ensuring that the grinding disc maintains this position for subsequent sandpaper tearing operations.

[0044] During the initial operation, the tear line 5 first moves to the right side (first side) of the negative pressure suction chamber 7 to avoid the grinding head 1; during operation, the tear line 5 first moves from the right side of the negative pressure suction chamber 7 to the left side (second side), and then moves from the left side of the negative pressure suction chamber 7 to the right side; that is, the tearing of sandpaper is achieved by the tear line 5 moving back and forth twice.

[0045] like Figure 2 As shown, the negative pressure suction chamber 7 is a hollow cylindrical structure, with a closed annular cavity formed between its inner and outer walls. The top of the negative pressure suction chamber 7 is an adsorption port for connecting to the sandpaper tearing platform 2, and this adsorption port is flush with the sandpaper tearing platform 2. The inner diameter of the negative pressure suction chamber 7 is slightly larger than the diameter of the sanding disc, allowing the sanding disc to align with the negative pressure suction chamber 7.

[0046] An air intake 10 is provided on the outer wall of the negative pressure suction chamber 7, and the air intake 10 is connected to a vacuum pump or other air extraction device; the number of air intakes 10 can be selected according to requirements, such as one, two or more. Multiple sets of negative pressure holes 8 are evenly distributed along the circumference of the inner wall of the negative pressure suction chamber 7, and each set has multiple negative pressure holes 8 along the axial direction of the negative pressure suction chamber 7, and multiple negative pressure holes 8 are evenly distributed along the circumference at the adsorption port; the adsorption effect on sandpaper is formed by the air extraction device, the air intake 10 and the negative pressure holes 8.

[0047] like Figure 2 As shown, a distance measuring column 9 is installed at the inner wall of the negative pressure suction chamber 7. The distance measuring column 9 measures the distance of the sandpaper to monitor whether the sanding disc is compressed and deformed. When deformation occurs, the height of the tear line 5 can be adjusted to ensure that the sandpaper can be easily torn off. The distance measuring column 9 includes a column body and a distance sensor. The top of the column body has an arc-shaped groove in which the distance sensor is installed. The main function of the column body is to protect the distance sensor and prevent the sandpaper from covering the surface of the distance sensor, which would cause the distance sensor to malfunction.

[0048] Because sandpaper is prone to the following issues: edge curling, edge folding, edge wear, and compression deformation of the grinding disc, and this compression deformation is a gradual process, at least two ranging posts 9 are installed on the inner wall of the negative pressure suction chamber 7 to detect the condition of the sandpaper edges. This embodiment uses two ranging posts 9 as an example for detailed explanation: the center line connecting the two ranging posts 9 and the center line connecting the negative pressure suction chamber 7 is located on the same horizontal line, that is, the center line is parallel to the direction of the slide rail assembly.

[0049] Understandably, in the embodiments, a ranging post 9 may also be added to the aforementioned horizontal line.

[0050] In this embodiment, the sandpaper tearing motion mainly involves the tear line 5 moving from right to left and from left to right, totaling two tearing motions. When one side of the sandpaper edge curls, even if the tear line 5 cannot effectively enter the space between the sandpaper and the grinding disc, it can still be effectively torn off through another tearing motion in the opposite direction. Furthermore, the negative pressure suction chamber 7 in this embodiment has negative pressure holes 8 distributed on both its upper and inner surfaces. Before the sandpaper tearing operation, the negative pressure provides effective tension to the sandpaper, allowing the tear line 5 to more easily enter the space between the sandpaper and the grinding disc. At the same time, during the sandpaper tearing operation, the negative pressure can effectively peel off the sandpaper at the point where the tear line 5 passes. After the sandpaper tearing operation is completed, the sandpaper is directly sucked into the bottom of the negative pressure suction chamber 7 by the negative pressure, avoiding any impact on the next sandpaper tearing operation.

[0051] Example 2:

[0052] This embodiment provides an automatic sandpaper tearing method, using the automatic sandpaper tearing device described in Embodiment 1. The specific method is as follows:

[0053] Before tearing the sandpaper, according to the different working conditions of the sandpaper and the grinding disc, it can be mainly divided into the following situations: the edge of the sandpaper curls, the edge of the sandpaper folds, the edge of the sandpaper wears, and the grinding disc compresses and deformes. And the compression deformation of the grinding disc is a gradual process. When the sandpaper is in a normal state, the distances of the sandpaper measured by the distance sensors on both sides are D1 and D2 respectively, and the thickness of the sandpaper is h. When the grinding disc has compression deformation, the data measured by the distance sensors are d1 and d2 respectively; the lifting mechanism 11 adjusts the height of the tearing line 5 according to the difference between the deformed sandpaper distance measured by any distance sensor and the normal sandpaper distance.

[0054] Among them, D1 - d1 = d < h or D2 - d2 = d < h;

[0055] For the above difference, a minimum threshold m is preset in advance. When d > m, it is considered that the grinding disc has produced compression deformation, and then the lifting mechanism 11 will move up and down according to d to adjust the position of the tearing line 5.

[0056] During the initial operation, the tearing line 5 moves to the rightmost side along with the slider on the slide rail 3, and the grinding head 1 translates from the left calibration track 6 to directly above the negative pressure paper suction bin 7. The negative pressure paper suction bin 7 starts to generate negative pressure, and the distance sensor inside the ranging column 9 measures the distance between the sandpaper on the surface of the grinding disc and the distance sensor. According to the measurement result, the position of the tearing line 5 is further adjusted to ensure that the tearing line 5 is located in the middle position between the sandpaper and the grinding disc.

[0057] After the position is adjusted, the tearing line 5 moves from the right side of the negative pressure paper suction bin 7 to the left side of the negative pressure paper suction bin 7. After waiting for a certain period of time (such as 1 s), it then moves from the left side of the negative pressure paper suction bin 7 to the right side. The torn sandpaper is sucked into the negative pressure paper suction bin 7, and the grinding head 1 moves away to complete the sandpaper tearing movement.

[0058] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic sandpaper tearing device, characterized in that, include: Sandpaper tearing platform; A negative pressure paper suction chamber is installed on the lower side of the sandpaper tearing platform. The negative pressure paper suction chamber is equipped with a distance measuring column for measuring the distance of the sandpaper. The tearing thread has locking mechanisms connected to both ends. The locking mechanisms are mounted on a slide rail assembly, which drives the tearing thread to move back and forth in the horizontal direction to tear sandpaper.

2. The automatic sandpaper tearing device according to claim 1, characterized in that, The slide rail assembly is connected to a lifting mechanism, which is used to adjust the tearing height according to the sandpaper distance.

3. The automatic sandpaper tearing device according to claim 2, characterized in that, At least two ranging columns are provided along the inner wall of the negative pressure paper suction chamber, and the center of the ranging column is on the same horizontal line as the center of the negative pressure paper suction chamber.

4. An automatic sandpaper tearing device according to claim 2 or 3, characterized in that, The ranging post includes a post body, and a distance sensor is installed on the top of the post body.

5. An automatic sandpaper tearing device according to claim 1 or 2, characterized in that, The negative pressure paper suction chamber is symmetrically equipped with slide rail assemblies on both sides, and the slide rail assemblies are set in a direction perpendicular to the tear line direction.

6. The automatic sandpaper tearing device according to claim 1, characterized in that, The suction port and sidewall of the negative pressure suction chamber are both provided with several negative pressure holes. The side wall of the negative pressure paper suction chamber is connected to an air suction port, which is used to connect to an air extraction device.

7. An automatic sandpaper tearing device according to claim 1, characterized in that, A calibration track is provided on one side of the negative pressure suction chamber. The calibration track is used to correct the position of the grinding disc so that the grinding disc is aligned with the negative pressure suction chamber.

8. An automatic sandpaper tearing method, characterized in that, The automatic sandpaper tearing device as described in any one of claims 1-7 includes: After the sanding head is placed on the upper side of the negative pressure paper suction chamber, the sandpaper is attracted by the negative pressure. A distance measuring column is used to measure the distance to sandpaper. The tear line moves from the first side of the negative pressure suction chamber to the second side, and then from the second side to the first side, tearing the sandpaper through the back-and-forth movement of the tear line; the first side is the side opposite to where the sanding head is pushed into the negative pressure suction chamber; The torn sandpaper is sucked into the negative pressure suction chamber.

9. The automatic sandpaper tearing method according to claim 8, characterized in that, When the distance between the sandpaper measured by the distance measuring column and the normal distance between the sandpaper and the distance is greater than the minimum threshold, the tearing height is adjusted by the lifting mechanism.

10. The automatic sandpaper tearing method according to claim 9, characterized in that, The normal sandpaper distances measured by the two distance measuring posts are D1 and D2, respectively, and the deformed sandpaper distances measured by the two distance measuring posts are d1 and d2, respectively. Where d = D1 - d1 or d = D2 - d2; d is the difference between the normal sandpaper distance and the deformed sandpaper distance measured by any distance measuring column, and m is the minimum threshold. When d > m, the lifting mechanism is activated to adjust the tear line position.

11. The automatic sandpaper tearing method according to claim 8, characterized in that, During the initial operation, the tear line moves to the first side via the slide rail assembly, and the grinding head moves from the second side to the upper side of the negative pressure suction compartment via the correction track.

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