A sandpaper tearing device

Abstract

The utility model discloses a kind of sandpaper tearing devices, for peeling the sandpaper adhered to the surface of grinding disc of polishing machine, the outer diameter of sandpaper is greater than the outer diameter of grinding disc, so that sandpaper can form a outer extension after being assembled to grinding disc Outer extension part that surrounds the outer periphery of grinding disc and extends outward, the sandpaper tearing device of the utility model includes mounting bracket, first clamping arm of detachably connected in one end of mounting bracket, drive unit connected with mounting bracket and second clamping arm with drive unit detachably connected and position corresponding with first clamping arm, drive unit can drive second clamping arm move towards the direction of approaching / away from first clamping arm, when second clamping arm moves towards the direction of approaching first clamping arm can hold outer extension part to peel sandpaper;When second clamping arm moves towards the direction of away from first clamping arm can release the holding of outer extension part, and automatic clamping peeling mode improves work efficiency, sandpaper peeling operation does not contact with grinding disc, avoid scratching, damage to grinding disc, prolong the service life of grinding disc, reduce equipment loss.

Description

Technical Field

[0001] This utility model belongs to the field of parts grinding technology, specifically relating to a sandpaper tearing device. Background Technology

[0002] During operation, the grinding machine relies on the sandpaper adhered to the surface of the grinding disc to contact and rub against the surface of the workpiece to achieve the grinding function. However, after long-term use, the sandpaper will experience problems such as abrasive wear and clogging, resulting in a significant decrease in grinding efficiency. At this time, it is necessary to replace the sandpaper with new sandpaper in time to ensure the grinding effect.

[0003] Currently, the crucial step of peeling off the old sandpaper during sanding machine replacement relies primarily on manual operation. Because the sandpaper is tightly bonded to the grinding disc with a high-strength adhesive, operators use hand tools with sharp or hook-like structures to first attempt to pry open the gaps at the edge of the sandpaper, then gradually peel the entire sandpaper off the grinding disc surface. However, this manual peeling method has several significant drawbacks: Firstly, it's difficult to precisely control the force applied manually. Insufficient force fails to effectively break the bond between the sandpaper and the grinding disc, leading to difficult and time-consuming peeling, severely impacting overall work efficiency and failing to meet the needs of large-scale, continuous production scenarios. Excessive force or inaccurate positioning can easily pierce the sandpaper and directly impact the grinding disc surface, causing damage. Secondly, during manual peeling, the operator's hands are in direct contact with the edge of the sandpaper and the grinding disc. The sharp edges of the sandpaper may contain metal shavings, dust, and other debris generated during grinding, easily causing cuts and other safety hazards. Utility Model Content

[0004] In view of the technical problems existing in the prior art, this utility model provides a sandpaper tearing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sandpaper-tearing device is disclosed for peeling sandpaper adhered to the surface of a grinding disc of a sander. The outer diameter of the sandpaper is larger than the outer diameter of the grinding disc, such that the sandpaper, after being assembled onto the grinding disc, forms an extended portion surrounding the outer circumference of the grinding disc. The sandpaper-tearing device includes a mounting bracket, a first clamping arm detachably connected to one end of the mounting bracket, a drive unit connected to the mounting bracket, and a second clamping arm detachably connected to the drive unit and positioned corresponding to the first clamping arm. The drive unit can drive the second clamping arm to move toward / away from the first clamping arm. When the second clamping arm moves toward the first clamping arm, it can clamp the extended portion to peel off the sandpaper; when the second clamping arm moves away from the first clamping arm, it can release the clamping of the extended portion.

[0006] Furthermore, the mounting bracket includes a mounting base plate that can be detachably connected to the grinding and protection equipment, and a mounting main plate that is perpendicularly connected to the mounting base plate at one end. The end of the mounting main plate that is away from the mounting base plate is perpendicularly connected to the first clamping arm. The driving unit is fixed to one side of the mounting main plate, and its power output end is drivenly connected to the second clamping arm. The power output end of the driving unit is drivenly connected to the second clamping arm to drive the second clamping arm to reciprocate in a direction close to / away from the first clamping arm, so as to realize the clamping, peeling and releasing reset of the extension portion.

[0007] Furthermore, the end of the mounting motherboard away from the mounting substrate has two chamfered right-angled portions, and the first clamping arm is screwed between the two chamfered right-angled portions.

[0008] Furthermore, a reinforcing plate is screwed onto the mounting base plate, and the reinforcing plate is also screwed onto the side of the mounting main plate away from the drive unit.

[0009] Furthermore, the first clamping arm includes a connecting section screwed to the mounting motherboard, a variable cross-section section fixed to one side of the connecting section, an extension section fixed to one side of the variable cross-section section, and a clamping section fixed to the extension section. The mounting motherboard is provided with a mounting groove for mounting the connecting section, and the connecting section is connected to the mounting groove by bolts. The variable cross-section segment is a structure in which the cross-sectional area gradually decreases from the connection end connected to the connection segment to the connection end connected to the extension segment; The clamping section has an L-shaped recessed notch at the end away from the second clamping arm.

[0010] Furthermore, the second clamping arm includes a connecting portion screwed to the drive unit and a clamping portion fixed to one side of the connecting portion.

[0011] Furthermore, the clamping end face of the clamping part and the clamping end face of the clamping segment are positioned correspondingly, and both the clamping end face of the clamping part and the clamping end face of the clamping segment are provided with serrated portions.

[0012] Furthermore, the drive unit is a cylinder.

[0013] In summary, the beneficial effects of this utility model are as follows: 1. The device, through the corresponding design of the first clamping arm and the second clamping arm, only clamps and peels the outer portion, without contacting the grinding disc surface throughout the process. This completely avoids the problems of grinding disc scratching and deformation that may occur due to contact with the grinding disc. The symmetrical clamping force design (synchronous engagement of the serrated end faces) ensures that the sandpaper is evenly removed along the grinding disc surface, reducing the cost of grinding disc maintenance and replacement. 2. The automated mechanical peeling completely replaces the manual operation of lifting the sandpaper by hand or tools, avoiding the risk of scratches and cuts to the operator's hands caused by the sharp edges of the sandpaper and metal fragments. At the same time, the operator does not need to approach the inside of the grinding protective box, reducing the risk of dust inhalation. 3. All core components of the device are detachably connected: the first and second clamping arms are connected to the mounting bracket / drive unit by bolts, and can be replaced individually after wear; the mounting bracket and protective box, and the reinforcing plate and mounting base plate / mounting main plate are all screwed together, facilitating later adjustment of position or maintenance. Third, the serrated end faces of the clamping section and clamping part can be embedded into the gaps between sandpaper fibers or abrasive grains, significantly increasing the friction. Even if there is residual dust or slight overflow of adhesive on the sandpaper surface, slippage can be avoided, improving the success rate of peeling and helping to improve peeling efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the sandpaper to be peeled off and the sander connected to the sandpaper in this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of a sandpaper tearing device provided by this utility model. Figure 1 .

[0016] Figure 3 This is a schematic diagram of the structure of a sandpaper tearing device provided by this utility model. Figure 2 .

[0017] Figure 4 This is a frontal projection view of the first and second clamping arms in the clamping state in this utility model.

[0018] Figure 5 This is a frontal projection view of the first and second clamping arms in the loosened state in this utility model.

[0019] In the diagram, 100-grinding machine, 110-grinding disc, 200-sandpaper, 210-extension section, 300-mounting bracket, 310-mounting substrate, 320-mounting motherboard, 321-chamfered right angle section, 400-first clamping arm, 410-connecting section, 420-variable cross-section section, 430-extension section, 440-clamping section, 441-L-shaped recessed notch, 500-drive unit, 600-second clamping arm, 610-connecting section, 620-clamping section, 700-reinforcing plate, 800-serrated section. Detailed Implementation

[0020] The present invention will be further explained below with reference to specific illustrations.

[0021] During the grinding process of notebook computer parts, the grinding machine 100 is usually connected to the robotic arm at one end. In order to isolate the sand particles and workpiece debris generated during grinding and avoid splashing and injuring people, the robotic arm usually operates the grinding machine 100 to complete the grinding work inside the grinding protective box. The grinding protective box is equipped with an operating port for the grinding machine 100 to enter / exit.

[0022] This utility model provides a sandpaper peeling device for peeling sandpaper 200 adhered to the surface of the grinding disc 110 of a sander 100. (See also...) Figure 1 As shown, the outer diameter of the sandpaper 200 is larger than the outer diameter of the grinding disc 110, so that after the sandpaper 200 is assembled onto the grinding disc 110, it can form an extension 210 that surrounds the outer periphery of the grinding disc 110 and extends outward. Please refer to... Figure 2 and Figure 3 As shown, this sandpaper tearing device includes a mounting bracket 300, a first clamping arm 400 detachably connected to one end of the mounting bracket 300, a drive unit 500 connected to the mounting bracket 300, and a second clamping arm 600 detachably connected to the drive unit 500 and positioned corresponding to the first clamping arm 400. The drive unit 500 can drive the second clamping arm 600 to move towards / away from the first clamping arm 400. Please refer to... Figure 4 As shown, when the second clamping arm 600 moves toward the direction close to the first clamping arm 400, it can clamp the extension portion 210 to peel off the sandpaper 200. See also... Figure 5 When the second clamping arm 600 moves away from the first clamping arm 400, it can release the clamping of the outer extension 210. This automated clamping and peeling method eliminates the need for manual lifting and peeling of the sandpaper 200, significantly reducing sandpaper 200 replacement time and improving overall grinding efficiency. The clamping operation only targets the outer extension 210 of the sandpaper 200, without contacting the surface of the grinding disc 110. This completely avoids scratching and damage to the grinding disc 110 by manual labor or simple tools, ensuring the flatness of the grinding disc 110. This, in turn, ensures the bonding stability and grinding accuracy of subsequent new sandpaper 200, while extending the service life of the grinding disc 110 and reducing equipment wear. The automated mechanical operation replaces direct manual contact, eliminating safety hazards such as hand cuts and scratches.

[0023] Please continue reading. Figure 2 and Figure 3As shown, the mounting bracket 300 includes a mounting base plate 310 that can be screwed onto the grinding and protection equipment, and a mounting main plate 320 with one end perpendicularly connected to the mounting base plate 310. The end of the mounting main plate 320 away from the mounting base plate 310 is perpendicularly connected to the first clamping arm 400. The drive unit 500 is fixed to one side of the mounting main plate 320, and its power output end is drivenly connected to the second clamping arm 600. The drive unit 500 is used to drive the second clamping arm 600 to reciprocate in the direction of approaching / away from the first clamping arm 400, so as to realize the clamping, peeling and releasing reset of the extension portion 210. The mounting bracket 300 is screwed onto the edge of the operating window of the grinding and protection equipment through the mounting base plate 310, which is exactly within the normal operating radius of the robotic arm controlling the grinding machine 100. When the sanding operation is completed and the sandpaper 200 needs to be replaced, the robotic arm does not need to make additional large-scale adjustments to its posture. It only needs to move the sander 100 closer to the edge of the operating window to ensure that the outer extension 210 is precisely aligned with the clamping area of ​​the first clamping arm 400 and the second clamping arm 600. This significantly shortens the switching time between the sanding station and the peeling station, meeting the core requirement of efficient flow in automated production. The device actively drives the second clamping arm 600 to achieve clamping / releasing through the drive unit 500, while the rigid connection structure between the mounting motherboard 320 and the first clamping arm 400 forms a fixed reference. The robotic arm only needs to complete the simple positioning action of "moving the grinding disc 110 closer to the clamping area" without participating in the complex clamping force control, which significantly reduces the programming difficulty and motion accuracy requirements of the robotic arm. Compared with the traditional manual peeling mode that requires the robotic arm and operator to cooperate, this design realizes a fully automated closed loop of "the robotic arm independently completing the sandpaper 200 replacement".

[0024] A reinforcing plate 700 is screwed onto the mounting base plate 310. The reinforcing plate 700 is also screwed onto the side of the mounting main plate 320 away from the drive unit 500. The reinforcing plate 700 is screwed onto the mounting base plate 310 and the side of the mounting main plate 320 away from the drive unit 500. Together, the three form a "triangular support". The mounting base plate 310 provides longitudinal fixation, the mounting main plate 320 bears lateral load, and the reinforcing plate 700 forms an oblique tie, which greatly improves the overall structural rigidity.

[0025] The mounting motherboard 320 has two chamfered right-angled portions 321 at the end furthest from the mounting substrate 310, and the first clamping arm 400 is screwed between the two chamfered right-angled portions 321. If the end of the mounting motherboard 320 is a right-angled structure, it will form a "rigid barrier" when the grinding disc 110 approaches the clamping station. Especially when the robotic arm moves the large-diameter grinding disc 110 to make fine adjustments to the angle, the edge of the grinding disc 110 is very likely to collide with the right-angled corner. However, by removing excess material at the corner, the two chamfered right-angled portions 321 form an inwardly contracting "wedge-shaped avoidance space". When the grinding disc 110 approaches from multiple angles such as horizontal and inclined, the edge can avoid the structure of the mounting motherboard 320. The robotic arm can complete the alignment without repeatedly adjusting the posture of the grinding disc 110.

[0026] Please continue reading. Figure 3 The first clamping arm 400 includes a connecting section 410 screwed to the mounting motherboard 320, a variable cross-section section 420 fixed to one side of the connecting section 410, an extension section 430 fixed to one side of the variable cross-section section 420, and a clamping section 440 fixed to the extension section 430. The mounting motherboard 320 is provided with a mounting groove for mounting the connecting section 410, and the connecting section 410 is connected to the mounting groove by bolts. The screw connection method ensures that the bolts tightly press the connecting section 410 onto the mounting motherboard 320 through the mounting groove, forming a rigid connection. This prevents the first clamping arm 400 from loosening or shifting due to excessive clamping force when peeling off the sandpaper 200. Furthermore, the screw connection structure facilitates future maintenance. When the first clamping arm 400 becomes worn, the bolts can be directly removed to replace the first clamping arm 400 without damaging the mounting motherboard 320, thus shortening maintenance downtime.

[0027] The variable cross-section section 420 has a structure where the cross-sectional area gradually decreases from the connecting end connected to the connecting section 410 to the connecting end connected to the extension section 430. The core function of the extension section 430 and the clamping section 440 is to "precisely align the outer extension 210" without bearing excessive load. The gradually decreasing cross-sectional area of ​​the variable cross-section section 420 towards the working end directly reduces the overall weight of the extension section 430 and the clamping section 440. For the drive unit 500 (such as a cylinder), this lightweight design means that when driving the second clamping arm 600 to approach / move away from the first clamping arm 400, there is no need to overcome the redundant weight of the first clamping arm 400, which can significantly reduce the power consumption of the drive unit 500. At the same time, it reduces the inertial force during the movement of the clamping arm, avoiding excessive "impact force" at the moment of clamping due to excessive inertia. This protects the outer extension 210 of the sandpaper 200 from being damaged by clamping, and also reduces the wear of components such as the piston and seals of the drive unit 500, extending the service life of the drive unit 500.

[0028] An L-shaped recessed notch 441 is provided at the end of the clamping section 440 away from the second clamping arm 600. The design of the L-shaped recessed notch 441 involves removing a portion of material at the end of the clamping section 440 away from the second clamping arm 600 to form an inwardly recessed "avoidance area." This L-shaped recessed notch 441 is aligned with the operating window, and its recessed area provides "moving redundancy space" for the edge of the grinding disc 110. Even if the grinding disc 110 is close to the operating window, its edge can move freely within the notch without contacting the clamping section 440 and causing interference. The L-shaped notch can reserve sufficient lateral and longitudinal avoidance distances to completely cover the movement range of the edge of the grinding disc 110, ensuring unobstructed grinding operations.

[0029] The second clamping arm 600 includes a connecting part 610 screwed to the drive unit 500 and a clamping part 620 fixed to one side of the connecting part 610. The second clamping arm 600 is easy to disassemble and assemble, and easy to replace after wear.

[0030] The clamping end faces of the clamping part 620 and the clamping end faces of the clamping section 440 are positioned opposite each other, and when clamping, they can make "direct contact" from both sides of the extension 210, forming a symmetrical and parallel clamping force. Both the clamping end faces of the clamping part 620 and the clamping end faces of the clamping section 440 are provided with serrated portions 800. When the sandpaper 200 contacts the clamping end face, if the surface is smooth, it is easy to "slip" due to dust residue or slight overflow of adhesive on the surface of the sandpaper 200. Especially in the initial stage of peeling, it is necessary to overcome the strong adhesive force between the sandpaper 200 and the grinding disc 110, and slippage will directly lead to peeling failure. However, the serrated portions 800, by forming an uneven tooth-like structure on the clamping end face, can be embedded in the gaps between the fibers or abrasive grains on the surface of the sandpaper 200, significantly increasing the friction. Even if there is dust or slight oil on the surface of the sandpaper 200, the serrated part 800 can firmly "bite" the sandpaper 200, ensuring that the sandpaper 200 will not slip off the clamping end face during the entire peeling process, thus improving the peeling success rate.

[0031] The drive unit 500 preferably uses a cylinder, which can provide stable linear reciprocating power, and its output force can be precisely controlled by adjusting the air pressure.

[0032] This sandpaper tearing device has the following advantages: 1. Through the corresponding design of the first clamping arm 400 clamping section 440 and the second clamping arm 600 clamping part 620, the device only clamps and peels off the outer extension 210 of the sandpaper 200, without contacting the surface of the grinding disc 110 throughout the process. This completely avoids the problems of scratching and deformation of the grinding disc 110 that may be caused by contact with the grinding disc 110. The symmetrical clamping force design (synchronous engagement of the serrated end faces) ensures that the sandpaper 200 is evenly removed along the surface of the grinding disc 110, reducing the maintenance and replacement costs of the grinding disc 110. 2. The mechanical automated peeling completely replaces the manual operation of lifting the sandpaper 200 by hand or tools, avoiding the risk of scratches and cuts to the operator's hands caused by the sharp edges of the sandpaper 200 and metal fragments; at the same time, the operator does not need to approach the inside of the grinding protective box, reducing the risk of dust inhalation. III. All core components of the device are detachably connected: the first clamping arm 400 and the second clamping arm 600 are connected to the mounting bracket 300 / drive unit 500 by bolts, and can be replaced individually after wear; the mounting bracket 300 and the protective box, and the reinforcing plate 700 and the mounting base plate 310 / mounting main plate 320 are all screwed together, facilitating later adjustment of position or maintenance. III. The serrated end faces of the clamping section 440 and the clamping part 620 can embed into the gaps between the fibers or abrasive grains of the sandpaper 200, significantly increasing the friction. Even if there is residual dust or slight overflow of adhesive on the surface of the sandpaper 200, slippage can be avoided, improving the success rate of peeling and helping to improve peeling efficiency.

[0033] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structure made using the contents of this utility model specification and drawings, whether directly or indirectly applied to other related technical fields, shall also be within the patent protection scope of this utility model.

Claims

1. A sandpaper peeling device for peeling sandpaper adhered to the surface of a grinding disc of a sander, wherein the outer diameter of the sandpaper is larger than the outer diameter of the grinding disc, so that the sandpaper, after being assembled onto the grinding disc, forms an extension that surrounds the outer periphery of the grinding disc and extends outward, characterized in that: The device includes a mounting bracket, a first clamping arm detachably connected to one end of the mounting bracket, a drive unit connected to the mounting bracket, and a second clamping arm detachably connected to the drive unit and positioned corresponding to the first clamping arm. The drive unit can drive the second clamping arm to move toward / away from the first clamping arm. When the second clamping arm moves toward the first clamping arm, it can clamp the outer portion to peel off the sandpaper. When the second clamping arm moves away from the first clamping arm, it can release the clamping of the outer portion.

2. The sandpaper tearing device according to claim 1, characterized in that: The mounting bracket includes a mounting base plate that can be detachably connected to a grinding and protection device, and a mounting main plate that is perpendicularly connected to the mounting base plate at one end. The end of the mounting main plate that is away from the mounting base plate is perpendicularly connected to the first clamping arm. The driving unit is fixed to one side of the mounting main plate, and its power output end is drivenly connected to the second clamping arm. The power output end of the driving unit is drivenly connected to the second clamping arm to drive the second clamping arm to reciprocate in a direction close to / away from the first clamping arm, so as to realize the clamping, peeling and releasing reset of the extension portion.

3. The sandpaper tearing device according to claim 2, characterized in that: The mounting motherboard has two chamfered right-angled portions at one end away from the mounting substrate, and the first clamping arm is screwed between the two chamfered right-angled portions.

4. The sandpaper tearing device according to claim 2, characterized in that: A reinforcing plate is screwed onto the mounting base plate, and the reinforcing plate is also screwed onto the side of the mounting main plate away from the drive unit.

5. The sandpaper tearing device according to claim 2, characterized in that: The first clamping arm includes a connecting section screwed to the mounting motherboard, a variable cross-section section fixed to one side of the connecting section, an extension section fixed to one side of the variable cross-section section, and a clamping section fixed to the extension section. The mounting motherboard is provided with a mounting groove for mounting the connecting section, and the connecting section is connected to the mounting groove by bolts. The variable cross-section segment is a structure in which the cross-sectional area gradually decreases from the connection end connected to the connection segment to the connection end connected to the extension segment; The clamping section has an L-shaped recessed notch at the end away from the second clamping arm.

6. The sandpaper tearing device according to claim 5, characterized in that: The second clamping arm includes a connecting portion screwed to the drive unit and a clamping portion fixed to one side of the connecting portion.

7. The sandpaper tearing device according to claim 6, characterized in that: The clamping end face of the clamping part and the clamping end face of the clamping segment are positioned correspondingly, and both the clamping end face of the clamping part and the clamping end face of the clamping segment are provided with serrated portions.

8. The sandpaper tearing device according to any one of claims 1-7, characterized in that: The drive unit is a cylinder.

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