Full-automatic polishing abrasive belt replacing assembly

Abstract

The invention provides a full-automatic polishing abrasive belt replacing assembly, and belongs to the technical field of vacuum cup abrasive belt polishing. The vacuum cup abrasive belt polishing equipment solves the problem that full automation cannot be achieved in the abrasive belt replacement process of existing vacuum cup abrasive belt polishing equipment. The device comprises a protection rack, a transposition polishing device and an abrasive belt storage device which are arranged in the protection rack, a guide rail device arranged on the outer side of the protection rack, and a workpiece clamping device movably arranged on the guide rail device; a workpiece taking station and a workpiece discharging station are arranged on the two sides of the guide rail device respectively, a workpiece polishing station is arranged at the position, close to the transposition polishing device, of the middle of the guide rail device, and the workpiece clamping device is used for clamping and fixing vacuum cup workpieces. Compared with the prior art, the full-automatic abrasive belt replacing process can be achieved.

Description

Technical Field

[0001] This invention belongs to the field of polishing technology for thermos cups, and relates to a fully automatic replacement assembly for polishing abrasive belts. Background Technology

[0002] In the production and processing of thermos cups, surface polishing is one of the key processes that determines the product's appearance, texture, and market competitiveness. Among these processes, abrasive belts are widely used for surface polishing of thermos cup shells due to their high polishing efficiency and adaptability to curved surface processing (thermos cups are mostly cylindrical or curved).

[0003] However, abrasive belts are typical consumable polishing materials. During continuous polishing, the abrasive particles on their surface gradually wear off and fall off, leading to a decrease in polishing precision and failing to meet the high-gloss, scratch-free processing requirements of thermos cups. Furthermore, severely worn abrasive belts may cause secondary scratches on the surface of the thermos cups, affecting product yield. Therefore, to ensure the stability of the polishing process and the quality of product processing, abrasive belts must be replaced periodically after a certain period of use or after polishing a certain number of workpieces.

[0004] Currently, the replacement of sanding belts on existing thermos cup production lines is generally done manually. The specific process includes: after stopping the machine, manually disassembling the sanding belt fixing mechanism, removing the worn sanding belt, moving the new sanding belt and manually fitting it onto the driving and driven wheels of the polishing equipment, adjusting the sanding belt tension to ensure no slippage during polishing, re-locking the fixing mechanism, and then restarting the equipment to resume production. This manual replacement method has many insurmountable drawbacks: 1. Low level of automation, heavy reliance on manual operation, which not only increases the company's labor costs, but also has extremely low replacement efficiency. A single sanding belt replacement usually takes several minutes or even more than ten minutes, resulting in long downtime of polishing equipment and significantly reducing the production efficiency of the entire production line. 2. The precision of manual replacement is difficult to control. The tension of the sanding belt depends entirely on the operator's experience. If the tension is too loose, the sanding belt will slip or shift during the polishing process, affecting the polishing precision. If the tension is too tight, the sanding belt may break prematurely or increase the load on the equipment drive mechanism, shortening the equipment's service life. At the same time, the coaxiality of the sanding belt is also difficult to guarantee, which can easily lead to the sanding belt running off-center and scratching the surface of the thermos cup. 3. Poor operational safety: Manual replacement requires close contact with moving parts such as high-speed rotating polishing wheels. If the equipment is accidentally started or there is residual mechanical inertia, it is very easy to cause safety accidents such as pinching and scratching. In addition, the metal dust generated during the polishing process is not completely dissipated. If operators perform replacement work in this environment for a long time, it will also harm their health. 4. Difficulty in adapting to the development needs of automated production lines. With the popularization of intelligent manufacturing technology, thermos cup manufacturers are promoting the automation and unmanned upgrading of their production lines. However, the manual replacement of sanding belts has become a key bottleneck restricting the improvement of the automation level of production lines.

[0005] In summary, the existing technology of manually changing sanding belts suffers from low automation, low production efficiency, unstable changing accuracy, poor operational safety, and incompatibility with automated production lines, making it unable to meet the demands of modern large-scale, high-precision production of thermos cups. Therefore, developing a thermos cup sanding belt polishing device capable of automatic sanding belt changing to overcome the aforementioned shortcomings of the existing technology has become a pressing technical problem for those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to address the problem that the belt replacement process in existing thermos cup polishing equipment cannot be fully automated, and to propose a fully automated polishing belt replacement assembly.

[0007] The objective of this invention can be achieved through the following technical solutions: An automatic polishing belt replacement assembly is characterized by comprising: a protective frame, a repositioning polishing device and a belt storage device disposed within the protective frame, a guide rail device disposed outside the protective frame, and a workpiece clamping device movably disposed on the guide rail device; the two sides of the guide rail device are a workpiece picking station and a workpiece unloading station, respectively, and the middle position of the guide rail device near the repositioning polishing device is the workpiece polishing station; the workpiece clamping device is used to clamp and fix the thermos cup workpiece; the repositioning polishing device can be switched between a polishing application state and a belt replacement state; in the polishing application state, the repositioning polishing device is used to polish the workpiece in the workpiece polishing station; in the belt replacement state, the repositioning polishing device is aligned with the belt storage device and can perform belt replacement operations.

[0008] In the aforementioned fully automatic sanding belt replacement assembly, the sanding belt storage device includes a lift fixedly mounted on a frame, a lift plate fixedly mounted on the lift output end of the lift, a support plate fixedly mounted on the lift plate via a vertical connecting rod, and a control drive unit mounted on the lift plate. Four sets of upper pulley blocks are fixedly mounted below the lift plate, with upper fixed pulleys rotating within each upper pulley block. Four sets of lower pulley blocks are fixedly mounted above the support plate, with lower fixed pulleys rotating within each upper and lower pulley block. The four sets of upper pulley blocks and the four sets of lower fixed pulleys are aligned vertically in pairs. A conveyor belt is taut between the upper pulley blocks and the lower fixed pulleys. Multiple cards for securing the sanding belt are evenly spaced around the outer periphery of the conveyor belt. Each card on a single conveyor belt has cards in three other conveyor belts at the same horizontal level. The lift plate and the support plate are parallel vertically, with the upper support plate fixedly connected to the lift plate. The control drive unit drives the four sets of conveyor belts to operate synchronously.

[0009] In the aforementioned fully automatic polishing belt replacement assembly, the control drive component includes a control drive motor fixedly mounted on a lifting plate, a lifting drive platform movably mounted on a vertical connecting rod, an upper drive pulley block fixedly mounted on the lifting plate, an upper drive fixed pulley rotatably mounted on the upper drive pulley block, a lower drive pulley block fixedly mounted on a support plate, a lower drive fixed pulley rotatably mounted on the lower drive pulley block, and a drive belt tightly fitted between the upper drive fixed pulley and the lower drive fixed pulley. The lifting drive platform is fixedly clamped to the drive belt by clamping plates, and the four sides of the lifting drive platform are clamped and fixed to four sets of transmission belts by clamping plates. The output end of the control drive motor is connected to the upper drive fixed pulley.

[0010] In the above-mentioned fully automatic polishing belt changing assembly, a shaping expansion plate is fixedly provided on the lifting plate. The shaping expansion plate is used to expand and shape the sanding belt placed on the card into a shape that is vertically aligned with the repositioning polishing device and can be received.

[0011] In the aforementioned fully automatic polishing belt replacement assembly, the outer rings of the upper fixed pulley, lower fixed pulley, upper drive fixed pulley, and lower drive fixed pulley are provided with outer locking teeth, and the inner circumferences of the transmission belt and drive belt are provided with inner locking teeth, with the contacting outer locking teeth and inner locking teeth interlocking with each other.

[0012] In the above-mentioned fully automatic polishing belt replacement assembly, the upper fixed pulley, lower fixed pulley, upper drive fixed pulley, and lower drive fixed pulley are the same parts, and the transmission belt and drive belt are the same parts.

[0013] In the aforementioned fully automatic polishing belt replacement assembly, the repositioning polishing device includes a robotic arm assembly and a polishing assembly. The robotic arm assembly includes an arm base, a first flip arm whose inner end is flipped and connected to the arm base, a second flip arm whose inner end is flipped and connected to the outer end of the first flip arm, and a third flip arm whose inner end is flipped and set on the outer end of the second flip arm. A mounting plate for mounting the polishing assembly is fixedly provided on the outer end of the third flip arm. The polishing assembly includes two polishing shafts rotatably mounted on the mounting plate. The two polishing shafts are connected by a belt transmission system. A polishing wheel is fixedly provided at the end of the polishing shaft. A sanding belt is detachably and tightly fitted on the polishing wheel. The belt transmission system is driven to rotate by a polishing drive component.

[0014] In the aforementioned fully automatic polishing belt replacement assembly, the polishing drive component includes a polishing drive motor fixedly mounted on a mounting plate, and the output end of the polishing drive motor is connected to the belt transmission system.

[0015] In the aforementioned fully automatic polishing belt replacement assembly, the polishing component further includes a tensioning shaft rotatably mounted on a mounting plate, and the tensioning shaft and two polishing shafts are both connected to a belt transmission system.

[0016] In the aforementioned fully automatic polishing belt replacement assembly, the polishing component further includes a heat sink fixedly mounted on the mounting plate, with the heat sink facing the direction of the polishing belt.

[0017] In the above-mentioned fully automatic polishing belt replacement assembly, there are two sets of the repositioning polishing device and the belt storage device.

[0018] In the above-mentioned fully automatic polishing belt changing assembly, a first driving component is provided at the connection between the first tilting arm and the arm seat. The first driving component includes a first motor for the first tilting arm to perform tilting motion and a first cylinder for completing the clamping and positioning action.

[0019] In the above-mentioned fully automatic polishing belt changing assembly, a second driving component is provided at the connection between the second tilting arm and the first tilting arm. The second driving component includes a second motor for the second tilting arm to perform tilting motion and a second cylinder for completing the clamping and positioning action.

[0020] In the above-mentioned fully automatic polishing belt changing assembly, a third driving component is provided at the connection between the third tilting arm and the second tilting arm. The third driving component includes a third motor for the third tilting arm to perform tilting motion and a third cylinder for completing the clamping and positioning action.

[0021] In the aforementioned fully automatic polishing belt changing assembly, the guide rail device includes a guide rail bracket and two parallel guide rails arranged side by side on the guide rail bracket, and the workpiece clamping device is movably arranged on the parallel guide rails.

[0022] In the above-mentioned fully automatic polishing belt changing assembly, the workpiece clamping device includes a clamping bracket and a clamping drive assembly. A clamping block is movably provided on the clamping bracket. The clamping block has two directions, and each direction is provided with two sets of jaws. The clamping drive assembly can be used to drive the jaws to open and close, and can also be used to drive the clamping block to change direction by 180 degrees.

[0023] Compared with the prior art, the present invention has the following technical features: 1. Achieves fully automated operation, significantly improving production efficiency and reducing costs. This assembly integrates a repositioning polishing device, an automatic belt storage and dispensing device, and an automatic workpiece conveying system, realizing fully unmanned operation from belt life determination, old belt removal, new belt supply, precise installation to tension adjustment. The time for a single replacement is reduced from several minutes or even tens of minutes manually to tens of seconds, significantly reducing downtime of the main polishing equipment and significantly improving the overall production line capacity and equipment utilization rate. At the same time, it completely replaces manual operation, saving long-term labor and management costs, achieving cost reduction and efficiency improvement in production.

[0024] 2. Ensuring consistent replacement process precision stabilizes and improves product processing quality. Through precise point-to-point control of the robotic arm and the toothed synchronous transmission system of the sanding belt storage device, the sanding belt is accurately placed into the predetermined position on the polishing wheel set each time it is replaced. The tension of the sanding belt is automatically controlled by a mechanical structure (such as a tensioning shaft) or integrated sensors, completely eliminating problems of excessively loose or tight tension caused by differences in human experience. This high-precision, highly consistent replacement method fundamentally avoids defects such as uneven polishing and scratches on workpieces caused by sanding belt installation deviations, misalignment, or improper tension. This ensures that the surface polishing quality of the product (such as high gloss and scratch-free requirements) remains consistently at a high level, significantly improving the product qualification rate.

[0025] 3. Eliminate safety hazards associated with manual operations and improve the working environment. The entire replacement process is completed automatically while the equipment is running. Operators do not need to come into close contact with dangerous areas such as high-speed rotating polishing wheels and moving parts of the robotic arm, completely eliminating the risk of mechanical injuries such as pinching and scratching. At the same time, personnel do not need to work in an environment where dust has not completely settled, reducing potential occupational health hazards and meeting the stringent requirements of modern factories for safe production and ergonomics.

[0026] 4. Ensure equipment operational reliability and extend the service life of key components. An automated tension control system consistently maintains the abrasive belt at the optimal tension level with the drive and driven pulleys, avoiding over-tightening that can occur with manual replacement. This reduces the risk of abnormal belt breakage and also alleviates unnecessary loads on the drive motor and transmission mechanism, helping to extend the service life of the polishing equipment's core components and lower equipment failure rates and maintenance costs.

[0027] 5. Perfectly adapted to the needs of intelligent manufacturing and flexible production. This assembly is a standardized automated functional module with the ability to communicate and coordinate with the upper-level production management system (MES) and intelligent scheduling system. It can not only be seamlessly integrated into automated and unmanned production lines, breaking through the key bottleneck of "manual belt changing" and realizing the automated closed loop of the entire production process; its modular design and programmable robotic arm movements also enable it to adapt to polishing tasks of different specifications and models of thermos cup shells or similar rotating workpieces, improving the flexibility of the production line.

[0028] 6. The innovative design of the abrasive belt supply and synchronization system ensures stable and reliable operation. In particular, the abrasive belt storage device employs a design combining multi-transmission belt toothed synchronous drive with a shaping and expanding plate. The toothed meshing drive guarantees absolute synchronization and accuracy in the lifting and positioning of multiple abrasive belt rolls, eliminating slippage and misalignment; the shaping and expanding plate pre-positions the stored abrasive belts in their working state, achieving a smooth transition from "static storage" to "dynamic positioning." This innovative design ensures a high success rate and high reliability for automatic abrasive belt delivery, forming a solid technical foundation for the entire automatic replacement function. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the first structure during the sand belt replacement process of the shift polishing device and the sand belt storage device; Figure 3 This is a second structural diagram of the sanding belt replacement process of the shift polishing device and the sanding belt storage device; Figure 4 This is a schematic diagram of the structure of the sanding belt storage device after the sanding belt is hidden. Figure 5 This is a schematic diagram of the repositioning polishing device; In the diagram, 1. Frame; 2. Lifting platform; 3. Lifting plate; 4. Support plate; 5. Vertical connecting rod; 6. Upper fixed pulley; 7. Lower fixed pulley; 8. Conveyor belt; 9. Card; 10. Control drive motor; 11. Lifting drive platform; 12. Upper drive fixed pulley; 13. Lower drive fixed pulley; 14. Drive belt; 15. Shaping expansion plate; 16. Belt transmission system; 17. Polishing wheel; 18. Tensioning shaft; 19. Radiator; 20. Parallel guide rail; 21. Gripper. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] like Figure 1 As shown, the fully automatic polishing belt changing assembly includes a protective frame 1, a repositioning polishing device and a belt storage device disposed within the protective frame 1, a guide rail device disposed outside the protective frame 1, and a workpiece clamping device movably disposed on the guide rail device. The two sides of the guide rail device are the workpiece picking station and the workpiece unloading station, respectively. The middle position of the guide rail device near the repositioning polishing device is the workpiece polishing station. The workpiece clamping device is used to clamp and fix the thermos cup workpiece. The repositioning polishing device can be switched between a polishing application state and a belt changing state. In the polishing application state, the repositioning polishing device is used to polish the workpiece in the workpiece polishing station. In the belt changing state, the repositioning polishing device is aligned with the belt storage device and can perform belt changing operations.

[0032] like Figures 2-4 As shown, the sanding belt storage device includes a lifting machine 2 fixedly mounted on a frame 1, a lifting plate 3 fixedly mounted on the lifting output end of the lifting machine 2, a support plate 4 fixedly mounted on the lifting plate 3 via a vertical connecting rod 5, and a control drive component mounted on the lifting plate 3. Four sets of upper pulley blocks are fixedly mounted below the lifting plate 3, with upper fixed pulleys 6 rotating inside the upper pulley blocks. Four sets of lower pulley blocks are fixedly mounted above the support plate 4, with lower fixed pulleys 7 rotating inside the upper and lower pulley blocks. The four sets of upper pulley blocks and the four sets of lower fixed pulleys 7 are aligned vertically with each other. A conveyor belt 8 is taut between the upper pulley blocks and the lower fixed pulleys 7. Multiple cards 9 for holding sanding belts are evenly spaced around the outer periphery of the conveyor belt 8. Each card 9 on a single set of conveyor belt 8 has cards 9 in the other three sets of conveyor belt 8 at the same horizontal height. The lifting plate 3 and the support plate 4 are parallel vertically, and the upper support plate 4 is fixedly connected to the lifting plate 3. The control drive component is used to drive the four sets of conveyor belts 8 to operate synchronously.

[0033] When using it, first place the sanding belt on all cards 9, and then you can perform a fully automated sanding belt replacement operation.

[0034] The control drive components include a control drive motor 10 fixedly mounted on the lifting plate 3, a lifting drive platform 11 movably mounted on the vertical connecting rod 5, an upper drive pulley block fixedly mounted on the lifting plate 3, an upper drive fixed pulley 12 rotatably mounted on the upper drive pulley block, a lower drive pulley block fixedly mounted on the support plate 4, a lower drive fixed pulley 13 rotatably mounted on the lower drive pulley block, and a drive belt 14 tightly fitted between the upper drive fixed pulley 12 and the lower drive fixed pulley 13. The lifting drive platform 11 is fixedly clamped to the drive belt 14 by clamping pieces. The lifting drive platform 11 is clamped and fixed around four sets of transmission belts 8 by clamping pieces. The output end of the control drive motor 10 is connected to the upper drive fixed pulley 12.

[0035] During operation: The drive motor 10 is started, and the rotational power is input to the upper drive fixed pulley 12. Under the linkage of the drive belt 14 and the lower drive fixed pulley 13, the drive belt 14 begins to rotate. The rotational movement of the drive belt 14 is output to the lifting drive platform 11 through the clamping plates, so that the lifting drive platform 11 can move up and down. The lifting drive platform 11 is clamped and fixed together with the four sets of transmission belts 8 through the other four clamping plates. Therefore, the four sets of transmission belts 8 will rotate synchronously with the lifting drive platform 11. The rotation of the transmission belts 8 is to switch the height position of the card 9. As the lowest card 9 moves from the outward side to the inward side of the transmission belt 8, the sanding belt on the card 9 will fall off under the action of gravity. At this time, the bottom repositioning polishing device has completed the positioning function of vertical alignment. Then the sanding belt will fall into the repositioning polishing device to complete the sanding belt replacement function.

[0036] A shaping expansion plate 15 is fixedly installed on the lifting plate 3. The shaping expansion plate 15 is used to expand and shape the sanding belt placed on the card 9 into a shape that is vertically aligned with the repositioning polishing device. In this way, the sanding belt itself is already in a shaped state with the repositioning polishing device. After the repositioning polishing device switches to the sanding belt changing position and completes its positioning, the repositioning polishing device can perfectly catch the sanding belt after it falls.

[0037] The outer rings of the upper fixed pulley 6, lower fixed pulley 7, upper drive fixed pulley 12, and lower drive fixed pulley 13 are provided with outer locking teeth, and the inner rings of the transmission belt 8 and drive belt 14 are provided with inner locking teeth. The contacting outer locking teeth and inner locking teeth are mutually locked. The mutual locking of outer locking teeth and inner locking teeth to transmit power is a very important aspect of this invention, because the four transmission belts 8 and drive belt 14 of this invention need to ensure completely consistent linkage. If power is transmitted through conventional friction, slippage of any component will disrupt the uniformity of the entire transmission system, making it impossible to work. Therefore, the scheme of outer locking teeth and inner locking teeth, through perfect meshing of teeth to transmit power, avoids the form of power transmission through friction, thus avoiding this problem.

[0038] The upper fixed pulley 6, lower fixed pulley 7, upper drive fixed pulley 12, and lower drive fixed pulley 13 are all identical parts, as are the transmission belt 8 and drive belt 14. This ensures the uniformity of all movements. The rotational speed input to the upper drive fixed pulley 12 will be directly proportional to the rotational speed of the other upper fixed pulleys 6, lower fixed pulley 7, and lower drive fixed pulley 13. In other words, the lifting speed of the lifting drive platform 11 can be perfectly matched to the lifting speed of the card 9 carrying the sanding belt.

[0039] like Figure 5 As shown, the repositioning polishing device includes a robotic arm assembly and a polishing assembly. The robotic arm assembly includes an arm base, a first flip arm whose inner end is flipped and connected to the arm base, a second flip arm whose inner end is flipped and connected to the outer end of the first flip arm, and a third flip arm whose inner end is flipped and set on the outer end of the second flip arm. A mounting plate for mounting the polishing assembly is fixedly provided on the outer end of the third flip arm. The polishing assembly includes two polishing shafts rotatably mounted on the mounting plate. The two polishing shafts are connected by a belt transmission system 16. A polishing wheel 17 is fixedly provided at the end of the polishing shaft. An abrasive belt is detachably and tightly fitted on the polishing wheel 17. The belt transmission system 16 is driven to rotate by a polishing drive component.

[0040] Through the multi-axis linkage of the first, second, and third tilting arms, the position of the polishing component can be switched, allowing the polishing component to switch between polishing application mode and belt replacement mode.

[0041] After the sanding belt is tightened by two polishing wheels 17 arranged side by side, the outward contact surface of the sanding belt is lengthened, ensuring that the sanding belt can contact the thermos cup workpiece with more contact surface during the polishing operation.

[0042] The polishing drive component includes a polishing drive motor fixedly mounted on the mounting plate, and the output end of the polishing drive motor is connected to the belt transmission system 16.

[0043] The polishing assembly also includes a tensioning shaft 18 rotatably mounted on the mounting plate, which is connected to both polishing shafts in the belt transmission system 16. The tensioning shaft 18 is not only used to tighten the entire belt transmission system 16, but is also an indispensable part of the sanding belt replacement process, aligning the shift polishing device and the sanding belt storage device vertically in preparation for sanding belt replacement.

[0044] The polishing assembly also includes a heat sink 19 fixedly mounted on the mounting plate, with the heat sink 19 facing the abrasive belt. Because the abrasive belt undergoes high-efficiency friction during the abrasive belt polishing process, generating a large amount of heat that affects the industrial performance of the abrasive belt, it is very meaningful to add a heat sink 19 to effectively cool the abrasive belt while it generates heat during polishing.

[0045] There are two sets of both the repositioning polishing device and the sand belt storage device.

[0046] A first driving component is provided at the connection between the first tilting arm and the arm base. The first driving component includes a first motor for the first tilting arm to perform tilting motion and a first cylinder for completing clamping and positioning action.

[0047] A second drive unit is provided at the connection between the second tilting arm and the first tilting arm. The second drive unit includes a second motor for the second tilting arm to perform tilting motion and a second cylinder for performing clamping and positioning action.

[0048] A third drive unit is provided at the connection between the third tilting arm and the second tilting arm. The third drive unit includes a third motor for the third tilting arm to perform tilting motion and a third cylinder for performing clamping and positioning action.

[0049] like Figure 1 As shown, the guide rail device includes a guide rail bracket and two parallel guide rails 20 arranged side by side on the guide rail bracket, and the workpiece clamping device is movably arranged on the parallel guide rails 20.

[0050] like Figure 1 As shown, the workpiece clamping device includes a clamping bracket and a clamping drive assembly. A clamping block is movably mounted on the clamping bracket. The clamping block has two directions, and each direction is provided with two sets of jaws 21. The clamping drive assembly can be used to drive the jaws 21 to open and close, and can also be used to drive the clamping block to change direction by 180 degrees.

[0051] It should be understood that in the claims and description of this invention, all instances of "comprising..." should be understood as having an open meaning, that is, their meaning is equivalent to "containing at least...", and should not be understood as having a closed meaning, that is, their meaning should not be understood as "containing only...".

[0052] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A fully automatic polishing belt replacement assembly, characterized in that: The device includes a protective frame, a repositioning polishing device and a sanding belt storage device installed within the protective frame, a guide rail device installed outside the protective frame, and a workpiece clamping device movably mounted on the guide rail device. The two sides of the guide rail device are the workpiece picking station and the workpiece unloading station, respectively. The middle position of the guide rail device, near the repositioning polishing device, is the workpiece polishing station. The workpiece clamping device is used to clamp and fix the thermos cup workpiece. The repositioning polishing device can be switched between a polishing application state and a sanding belt replacement state. In the polishing application state, the repositioning polishing device is used to polish the workpiece at the workpiece polishing station. In the sanding belt replacement state, the repositioning polishing device is aligned with the sanding belt storage device and can perform sanding belt replacement operations.

2. The fully automatic polishing belt replacement assembly according to claim 2, characterized in that: The sanding belt storage device includes a lift fixedly mounted on a frame, a lifting plate fixedly mounted on the lifting output end of the lift, a support plate fixedly mounted on the lifting plate via a vertical connecting rod, and a control drive unit mounted on the lifting plate. Four sets of upper pulley blocks are fixedly mounted below the lifting plate, with upper fixed pulleys rotating within each upper pulley block. Four sets of lower pulley blocks are fixedly mounted above the support plate, with lower fixed pulleys rotating within each upper and lower pulley block. The four sets of upper pulley blocks and the four sets of lower fixed pulleys are aligned vertically in pairs. A conveyor belt is taut between the upper pulley blocks and the lower fixed pulleys. Multiple cards for securing the sanding belt are evenly spaced around the outer circumference of the conveyor belt. Each card on a single conveyor belt has cards in three other conveyor belts at the same horizontal level. The lifting plate and the support plate are parallel vertically, with the upper support plate fixedly connected to the lifting plate. The control drive unit drives the four sets of conveyor belts to operate synchronously.

3. The fully automatic polishing belt replacement assembly according to claim 1, characterized in that: The control drive component includes a control drive motor fixedly mounted on the lifting plate, a lifting drive platform movably mounted on the vertical connecting rod, an upper drive pulley block fixedly mounted on the lifting plate, an upper drive fixed pulley rotatably mounted on the upper drive pulley block, a lower drive pulley block fixedly mounted on the support plate, a lower drive fixed pulley rotatably mounted on the lower drive pulley block, and a drive belt tightly fitted between the upper drive fixed pulley and the lower drive fixed pulley. The lifting drive platform is fixedly clamped to the drive belt by clamping plates. The lifting drive platform is clamped and fixed to four sets of transmission belts around its perimeter by clamping plates. The output end of the control drive motor is connected to the upper drive fixed pulley.

4. The fully automatic polishing belt replacement assembly according to claim 1, characterized in that: The lifting plate is fixedly provided with a shaping expansion plate, which is used to expand and shape the sanding belt placed on the card into a shape that can be received and aligned vertically with the repositioning polishing device.

5. The fully automatic polishing belt replacement assembly according to claim 1, characterized in that: The outer rings of the upper fixed pulley, lower fixed pulley, upper drive fixed pulley, and lower drive fixed pulley are provided with outer locking teeth, and the inner circumferences of the transmission belt and drive belt are provided with inner locking teeth. The contacting outer locking teeth and inner locking teeth are mutually locked.

6. The fully automatic polishing belt replacement assembly according to claim 1, characterized in that: The upper fixed pulley, lower fixed pulley, upper drive fixed pulley, and lower drive fixed pulley are all the same parts, as are the transmission belt and drive belt.

7. The fully automatic polishing belt replacement assembly according to claim 1, characterized in that: The aforementioned repositioning and polishing device includes a robotic arm assembly and a polishing assembly. The robotic arm assembly includes an arm base, a first flip arm whose inner end is flipped and connected to the arm base, a second flip arm whose inner end is flipped and connected to the outer end of the first flip arm, and a third flip arm whose inner end is flipped and set on the outer end of the second flip arm. A mounting plate for mounting the polishing assembly is fixedly provided on the outer end of the third flip arm. The polishing assembly includes two polishing shafts rotatably mounted on the mounting plate. The two polishing shafts are connected by a belt transmission system. A polishing wheel is fixedly provided at the end of the polishing shaft. An abrasive belt is detachably and tightly fitted on the polishing wheel. The belt transmission system is driven to rotate by a polishing drive component.

8. The fully automatic polishing belt replacement assembly according to claim 1, characterized in that: The polishing assembly also includes a tensioning shaft rotatably mounted on the mounting plate, and the tensioning shaft and the two polishing shafts are both connected to a belt transmission system.

9. The fully automatic polishing belt replacement assembly according to claim 1, characterized in that: The guide rail device includes a guide rail bracket and two parallel guide rails arranged side by side on the guide rail bracket, and a workpiece clamping device is movably mounted on the parallel guide rails.

10. The fully automatic polishing belt replacement assembly according to claim 10, characterized in that: The workpiece clamping device includes a clamping bracket and a clamping drive assembly. A clamping block is movably mounted on the clamping bracket. The clamping block has two directions, and each direction is provided with two sets of jaws. The clamping drive assembly can be used to drive the jaws to open and close, and can also be used to drive the clamping block to change direction by 180 degrees.

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