Automatic grinding robot
By designing an automatic grinding robot, the combination of grinding, walking, vacuuming and dust storage mechanisms is used to solve the problem of dust pollution when manually grinding the ground, and a safer and more efficient grinding process is achieved.
Patent Information
- Application Number
- CN202510148671.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2025-03-25
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
A lot of dust will be generated when manually polishing the ground, affecting the health of the person.
Design an automatic grinding robot, including a grinding mechanism, a walking mechanism, a vacuum cleaner mechanism and a dust storage mechanism. The grinding mechanism is used to grind the ground, the walking mechanism drives the grinding mechanism to move, and the vacuum cleaner collects dust and transmits it to the dust storage mechanism for storage.
Through the automatic grinding robot, dust is avoided floating in the air and absorbed by the staff during the grinding process, ensuring the physical health of the personnel, and improving the grinding efficiency and safety.
Smart Images

Figure CN119681739A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of plane grinding, and in particular to an automatic grinding robot. Background Art
[0002] After the construction site floor is fixed with cement, the cement floor will be manually polished with a grinding tool to ensure the flatness of the floor, so as to facilitate the laying of the carpet on the floor later. Now, since manual workers need to squat on the ground and bend over when polishing, long-term polishing operations will cause damage to the human body. In addition, a large amount of dust is generated during the polishing process. Even if the workers wear masks, some dust will be inhaled into the body, further affecting their health. Summary of the invention
[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an automatic grinding robot for solving the problem in the prior art that manual grinding generates a large amount of dust, thereby affecting the health of personnel.
[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides an automatic polishing robot, which includes a chassis and a polishing mechanism, a walking mechanism, a dust suction mechanism and a dust storage mechanism arranged on the chassis, the polishing mechanism is used to polish the ground, the walking mechanism is used to drive the polishing mechanism to move on the ground, the dust suction mechanism is used to collect dust generated by polishing the polishing mechanism, and the dust storage mechanism is used to store the dust collected by the dust suction mechanism.
[0005] Optionally, the grinding mechanism includes a grinding disc and a grinding drive assembly, the grinding disc is rotatably arranged at the bottom of the chassis and the bottom surface of the grinding disc is kept flush with the ground, and the grinding drive assembly is used to drive the grinding disc to rotate.
[0006] Optionally, the grinding drive assembly includes a grinding motor, a main gear, a secondary gear, gear one, gear two, a connecting shaft and a driving shaft. A motor slot is provided on the chassis, and the grinding motor is arranged in the motor slot. A circular groove is also provided on the chassis, and the main gear is arranged in the circular groove. The output shaft of the grinding motor penetrates into the circular groove and is coaxially fixedly connected to the main gear. A rotating groove is also provided on the chassis, and the secondary gear is arranged in the rotating groove. The driving shaft is coaxially fixedly arranged on the secondary gear. One end of the driving shaft away from the secondary gear extends out of the chassis and is coaxially fixedly connected to the grinding disc. The gear one and the gear two are respectively arranged in the circular groove and the rotating groove, the gear one is meshed with the main gear, and the gear two is meshed with the secondary gear. A through groove connecting the circular groove and the rotating groove is also provided on the chassis, and the connecting shaft is arranged in the through groove and its two ends are coaxially fixedly connected to the gear one and the gear two respectively.
[0007] Optionally, the walking mechanism comprises a dual-axis motor and two rollers, the dual-axis motor is arranged on the bottom surface of the chassis, the two rollers are coaxially fixedly arranged on two output shafts of the dual-axis motor respectively, and both the two rollers can abut on the ground;
[0008] The walking mechanism also includes two U-shaped plates, and the two rollers are rotatably arranged on the two U-shaped plates respectively.
[0009] Optionally, the dust collection mechanism comprises a dust collection box, a dust collection drive assembly and fan blades, the dust collection box is arranged on the chassis, the fan blades are arranged inside the dust collection box, the dust collection drive assembly is used to drive the fan blades to rotate, and a dust collection groove is opened on the chassis, one end of the dust collection groove passes through the bottom of the chassis, and the other end is connected to the dust collection box;
[0010] An annular groove is also formed at the bottom of the chassis, and one end of the dust collection groove away from the dust collection box is connected to the annular groove.
[0011] Optionally, the dust collection drive assembly includes a rotating shaft, one end of the rotating shaft is coaxially fixedly arranged on the main gear, and the other end of the rotating shaft is coaxially fixedly connected to the fan blade.
[0012] Optionally, the dust storage mechanism comprises a dust storage box, an air inlet and an air outlet are provided on the dust storage box, the dust storage box is connected with the dust collection box through the air inlet, a filter is provided at the air outlet, a rotating plate is rotatably provided at the air inlet, the rotating plate has the same cross-sectional size as the air inlet, and the rotating plate is in a vertical state under the action of its own gravity;
[0013] The dust storage mechanism further comprises a funnel, which is arranged inside the dust storage box and has an end with a larger diameter facing vertically upward.
[0014] Optionally, a water inlet is provided at the top of the dust storage box, and a drain outlet is provided at the bottom of the dust storage box, the water inlet is used to transport clean water into the dust storage box, and the drain outlet is used to discharge sewage in the dust storage box.
[0015] Optionally, the robot further includes a battery, a storage slot is provided on the chassis, and the battery is disposed in the storage slot.
[0016] Optionally, the robot further includes an automatic navigation controller and an adaptive leveler, wherein the automatic navigation controller is used to plan the moving route of the walking mechanism and automatically navigate, and the adaptive leveler is used to adjust the horizontal states of the walking mechanism and the polishing mechanism to polish the ground flat.
[0017] In an automatic polishing robot of the present invention, a polishing mechanism, a walking mechanism, a dust suction mechanism and a dust storage mechanism are provided, the robot is placed on the ground to be polished, and the walking mechanism is controlled to drive the polishing mechanism to move on the ground. When moving to a raised position on the ground, the polishing mechanism will polish the raised position, thereby polishing the ground flat. A large amount of dust will be generated during the polishing process. At this time, the dust suction mechanism collects the dust and transfers it to the dust storage mechanism for storage, thereby preventing the dust generated during the polishing process from floating in the air and being absorbed by the staff, thereby ensuring the health of the staff. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a schematic diagram of the overall structure of an automatic polishing robot according to an embodiment of the present invention;
[0019] Figure 2 is a schematic diagram of the bottom structure of a chassis according to an embodiment of the present invention;
[0020] Figure 3 is a schematic diagram of the internal structure of an automatic polishing robot according to an embodiment of the present invention;
[0021] Figure 4 is a schematic diagram of the position distribution of the circular groove, the rotating groove and the through groove in one embodiment of the present invention;
[0022] Figure 5 It is a schematic diagram showing the structure of a battery in one embodiment of the present invention. DETAILED DESCRIPTION
[0023] Refer to the following Figures 1 to 5To describe an automatic grinding robot of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.
[0024] Unless otherwise clearly defined and limited, the terms "set", "install", "connect", "connect", "fix", "couple" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.
[0025] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0026] In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0027] like Figure 1-Figure 5As shown, an embodiment of the present invention provides an automatic polishing robot. The robot includes a chassis 1 and a polishing mechanism, a walking mechanism, a dust collecting mechanism and a dust storage mechanism arranged on the chassis 1. The polishing mechanism is used to polish the ground. The walking mechanism is used to drive the polishing mechanism to move on the ground. The dust collecting mechanism is used to collect dust generated by the polishing mechanism. The dust storage mechanism is used to store the dust collected by the dust collecting mechanism.
[0028] By placing the robot on the ground to be polished, the walking mechanism is controlled to drive the polishing mechanism to move on the ground. When it moves to the raised position on the ground, the polishing mechanism will polish the raised position to polish the ground flat. A lot of dust will be generated during the polishing process. At this time, the dust collection mechanism will collect the dust and transfer it to the dust storage mechanism for storage, thereby preventing the dust generated during the polishing process from floating in the air and being absorbed by the staff, thereby ensuring the health of the staff.
[0029] In some embodiments of the present invention, the grinding mechanism includes a grinding disc 2 and a grinding drive assembly. The grinding disc 2 is rotatably arranged at the bottom of the chassis 1, and the bottom surface of the grinding disc 2 is kept flush with the ground. The grinding drive assembly is used to drive the grinding disc 2 to rotate. When grinding, the grinding disc 2 is driven to rotate by the grinding drive assembly. When the grinding disc 2 moves to a raised position on the ground, since the bottom surface of the grinding disc 2 is kept flush with the ground, the grinding disc 2 will cut the raised position flat, thereby achieving the purpose of grinding the ground.
[0030] Furthermore, the grinding drive assembly includes a grinding motor 3, a main gear 4, a secondary gear 5, a gear 1 6, a gear 2 7, a connecting shaft 8 and a driving shaft 9. A motor slot 11 is provided on the chassis 1, and the grinding motor 3 is arranged in the motor slot 11. A circular slot 12 is also provided on the chassis 1, and the main gear 4 is arranged in the circular slot 12. The output shaft of the grinding motor 3 penetrates the circular slot 12 and is coaxially fixedly connected with the main gear 4. A rotating slot 13 is also provided on the chassis 1, and the secondary gear 5 is arranged in the rotating slot 13. The driving shaft 9 is coaxially fixedly arranged on the secondary gear 5, and one end of the driving shaft 9 away from the secondary gear 5 extends out of the chassis 1 and is coaxially fixedly connected with the grinding disc 2. Gear 1 6 and gear 2 7 are respectively arranged in the circular slot 12 and the rotating slot 13, and gear 1 6 is meshed with the main gear 4, and gear 2 7 is meshed with the secondary gear 5. A through groove 14 connecting the circular groove 12 and the rotating groove 13 is also provided on the chassis 1. The connecting shaft 8 is arranged in the through groove 14 and its two ends are coaxially fixedly connected to the gear 1 6 and the gear 2 7 respectively.
[0031] By turning on the grinding motor 3, the grinding motor 3 drives the main gear 4 to rotate coaxially, and the rotation of the main gear 4 drives the gear 1 6 to rotate, and the rotation of the gear 1 6 further drives the gear 2 7 to rotate through the connecting shaft 8, and the rotation of the gear 2 7 drives the secondary gear 5 to rotate, thereby driving the grinding disc 2 to rotate through the driving shaft 9. Through the mutual cooperation of the various gears, the grinding disc 2 is driven to rotate more stably.
[0032] Optionally, the chassis 1 is configured as a disc structure. A plurality of grinding discs 2 are provided, and the plurality of grinding discs 2 are evenly arranged along the circumference of the chassis 1. Specifically, four grinding discs 2 are provided. Accordingly, four secondary gears 5, gears 1 6, gears 2 7, connecting shafts 8, and driving shafts 9 are provided. Four rotating grooves 13 and through grooves 14 are also provided.
[0033] Furthermore, the circular groove 12 is located at the center of the four rotating grooves 13, and the main gear 4 is located at the center of the four secondary gears 5, thereby improving the coordination of the operation of the entire device.
[0034] Furthermore, the bottom edge of the grinding disc 2 is in an arc-shaped structure, so that the grinding disc 2 contacts the raised part of the ground more evenly and the grinding effect is better.
[0035] In some embodiments of the present invention, the walking mechanism includes a dual-axis motor 15 and two rollers 16. The dual-axis motor 15 is arranged on the bottom surface of the chassis 1. The two rollers 16 are coaxially fixed on the two output shafts of the dual-axis motor 15 and both rollers 16 can abut on the ground. When it is necessary to drive the grinding mechanism to move, turn on the dual-axis motor 15, and the dual-axis motor 15 will drive the two rollers 16 to roll on the ground, thereby realizing the movement of the grinding mechanism to grind different positions on the ground. By controlling the rotation speed of the two output shafts of the dual-axis motor 15, when the rotation speeds of the two output shafts of the dual-axis motor 15 are different, turning operation can be achieved.
[0036] Furthermore, the walking mechanism further includes two U-shaped plates 17 , and the two rollers 16 are rotatably disposed on the two U-shaped plates 17 , respectively, so that the rollers 16 roll more smoothly.
[0037] In some embodiments of the present invention, the dust collection mechanism includes a dust collection box 18, a dust collection drive assembly and a fan blade 19. The dust collection box 18 is arranged on the chassis 1. The fan blade 19 is arranged inside the dust collection box 18, and the dust collection drive assembly is used to drive the fan blade 19 to rotate. A dust collection groove 21 is provided on the chassis 1, one end of the dust collection groove 21 passes through the bottom of the chassis 1, and the other end is connected to the dust collection box 18. Optionally, the dust collection box 18 is arranged on the top of the chassis 1. The fan blade 19 is driven to rotate by the dust collection drive assembly, and the rotation of the fan blade 19 will form a negative pressure in the dust collection groove 21, so that the dust on the ground is gathered in the dust collection groove 21, and enters the dust collection box 18 through the dust collection groove 21 for collection.
[0038] Furthermore, an annular groove 22 is provided at the bottom of the chassis 1, and one end of the dust collecting groove 21 away from the dust collecting box 18 is connected to the annular groove 22. By providing the annular groove 22, dust can be easily collected.
[0039] Optionally, a plurality of dust suction grooves 21 are provided, and the plurality of dust suction grooves 21 are evenly arranged along the circumference of the annular groove 22. Specifically, four dust suction grooves 21 are provided.
[0040] Furthermore, the dust suction drive assembly includes a dust suction motor and a rotating shaft 23. The output shaft of the dust suction motor is coaxially fixedly connected to one end of the rotating shaft 23, and the other end of the rotating shaft 23 is coaxially fixedly connected to the fan blade 19. When the dust suction motor is turned on, the dust suction motor drives the rotating shaft 23 to rotate coaxially, thereby driving the fan blade 19 to rotate.
[0041] In some alternative embodiments of the present invention, the dust suction motor is removed, so that the dust suction mechanism shares the grinding motor 3 of the grinding mechanism. The end of the rotating shaft 23 away from the fan blade 19 is coaxially fixedly connected to the side of the main gear 4 away from the grinding motor 3. When the grinding motor 3 drives the grinding disc 2 to rotate, it also drives the fan blade 19 to rotate synchronously, making the structure simpler and saving energy.
[0042] In some embodiments of the present invention, the dust storage mechanism includes a dust storage box 24, on which an air inlet 25 and an air outlet 26 are provided, and the dust storage box 24 is connected to the dust collection box 18 through the air inlet 25. A filter screen 28 is provided at the air outlet 26. A rotating plate 27 is rotatably provided at the air inlet 25, and the rotating plate 27 has the same cross-sectional size as the air inlet 25. The rotating plate 27 is in a vertical state under the action of its own gravity. Initially, the rotating plate 27 is in a vertical state, closing the air inlet 25. When the fan blade 19 rotates, the generated wind force blows the rotating plate 27, so that the air and dust in the dust collection box 18 enter the dust storage box 24 through the air inlet 25 at the same time. The dust falls into the bottom of the dust storage box 24 under the action of its own gravity, and the air is discharged from the dust storage box 24 through the air outlet 26. By providing the rotating plate 27, the dust in the dust storage box 24 can be prevented from flowing back into the dust collection box 18. In addition, the filter 28 serves to intercept dust and prevent the dust from re-entering the atmosphere through the exhaust port 26 .
[0043] Optionally, the dust collecting box 18 is a rectangular parallelepiped structure as a whole, and four dust storage boxes 24 are provided, and the four dust storage boxes 24 are respectively provided on four side walls of the dust collecting box 18. Correspondingly, four rotating plates 27 are also provided.
[0044] Furthermore, the dust storage mechanism further includes a funnel 29, which is fixedly arranged inside the dust storage box 24 and has a larger end facing vertically upward. After dust enters the dust storage box 24, it is collected and dropped to the bottom of the dust storage box 24 through the funnel 29.
[0045] Optionally, the exhaust port 26 is provided between the top and the bottom of the funnel 29. The upper and lower sides of the rotating plate 27 are both arc-shaped structures, and the rotating plate 27 is rotatably arranged by a rotating shaft passing through the rotating plate 27. The filtering accuracy of the filter screen 28 is 1-100 μm.
[0046] Furthermore, a water inlet 31 is provided at the top of the dust storage box 24, and a drain port 32 is provided at the bottom of the dust storage box 24. The water inlet 31 is used to transport clean water into the dust storage box 24, and the drain port 32 is used to discharge the sewage in the dust storage box 24. By connecting a water inlet pipe to the water inlet 31, clean water can be transported into the dust storage box 24, so that dust enters the dust storage box 24 and falls into the water at the bottom of the dust storage box 24, thereby reducing the situation where dust flies around. The sewage in the dust storage box 24 can be regularly discharged through the drain port 32.
[0047] Optionally, a sealing cover 33 is provided on the water inlet 31, and the sealing cover 33 is connected to the water inlet 31 via threads.
[0048] In some embodiments of the present invention, the robot further includes a battery 34, which is used to provide the power required by the device. A storage slot 35 is provided on the chassis 1, and the battery 34 is arranged in the storage slot 35. Optionally, a plurality of batteries 34 are provided, and a plurality of corresponding storage slots 35 are also provided.
[0049] In some embodiments of the present invention, the robot further includes an automatic navigation controller 36 to plan the moving route of the walking mechanism and automatically navigate. Optionally, the automatic navigation controller 36 is electrically connected to the walking mechanism. Specifically, the automatic navigation controller 36 is electrically connected to the dual-axis motor 15. The automatic navigation controller 36 can control the rotation speed of the two output shafts of the dual-axis motor 15. When the two output shafts of the dual-axis motor 15 rotate at different speeds, the entire device will automatically turn and move and automatically navigate based on the route planned by the automatic navigation controller 36.
[0050] In some embodiments of the present invention, the robot further comprises an adaptive leveler, which is used to adjust the horizontal state of the walking mechanism and the grinding mechanism so as to grind the ground flat. Optionally, the adaptive leveler can adjust the horizontal state of the roller 16 and the grinding disc 2.
[0051] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.
Claims
1. An automatic polishing robot, characterized in that: The robot includes a chassis and a grinding mechanism, a walking mechanism, a dust suction mechanism and a dust storage mechanism arranged on the chassis. The grinding mechanism is used for grinding the ground, the walking mechanism is used for driving the grinding mechanism to move on the ground, the dust suction mechanism is used for collecting dust generated by grinding by the grinding mechanism, and the dust storage mechanism is used for storing dust collected by the dust suction mechanism.
2. The automatic polishing robot according to claim 1, characterized in that: The grinding mechanism comprises a grinding disc and a grinding drive assembly. The grinding disc is rotatably arranged at the bottom of the chassis and the bottom surface of the grinding disc is kept flush with the ground. The grinding drive assembly is used to drive the grinding disc to rotate.
3. The automatic polishing robot according to claim 2, characterized in that: The grinding drive assembly comprises a grinding motor, a main gear, a secondary gear, gear one, gear two, a connecting shaft and a driving shaft. A motor slot is provided on the chassis, the grinding motor is arranged in the motor slot, a circular slot is also provided on the chassis, the main gear is arranged in the circular slot, the output shaft of the grinding motor penetrates into the circular slot and is coaxially fixedly connected with the main gear, a rotating slot is also provided on the chassis, the secondary gear is arranged in the rotating slot, the driving shaft is coaxially fixedly provided on the secondary gear, one end of the driving shaft away from the secondary gear extends out of the chassis and is coaxially fixedly connected with the grinding disc, the gear one and the gear two are respectively arranged in the circular slot and the rotating slot, the gear one is meshed with the main gear, the gear two is meshed with the secondary gear, a through slot connecting the circular slot and the rotating slot is also provided on the chassis, the connecting shaft is arranged in the through slot and its two ends are coaxially fixedly connected with the gear one and the gear two respectively.
4. The automatic polishing robot according to claim 1, characterized in that: The walking mechanism comprises a dual-axis motor and two rollers, wherein the dual-axis motor is arranged on the bottom surface of the chassis, and the two rollers are coaxially fixedly arranged on the two output shafts of the dual-axis motor respectively, and both the two rollers can abut on the ground; The walking mechanism also includes two U-shaped plates, and the two rollers are rotatably arranged on the two U-shaped plates respectively.
5. The automatic polishing robot according to claim 3, characterized in that: The dust collection mechanism comprises a dust collection box, a dust collection drive assembly and a fan blade, wherein the dust collection box is arranged on the chassis, the fan blade is arranged inside the dust collection box, the dust collection drive assembly is used to drive the fan blade to rotate, and a dust collection groove is provided on the chassis, one end of the dust collection groove passes through the bottom of the chassis, and the other end is connected to the dust collection box; An annular groove is also formed at the bottom of the chassis, and one end of the dust collection groove away from the dust collection box is connected to the annular groove.
6. The automatic polishing robot according to claim 5, characterized in that: The dust suction drive assembly comprises a rotating shaft, one end of which is coaxially fixedly arranged on the main gear, and the other end of which is coaxially fixedly connected to the fan blade.
7. The automatic polishing robot according to claim 5, characterized in that: The dust storage mechanism comprises a dust storage box, an air inlet and an air outlet are provided on the dust storage box, the dust storage box is connected with the dust collection box through the air inlet, a filter is provided at the air outlet, a rotating plate is rotatably provided at the air inlet, the rotating plate has the same cross-sectional size as the air inlet, and the rotating plate is in a vertical state under the action of its own gravity; The dust storage mechanism further comprises a funnel, which is arranged inside the dust storage box and has an end with a larger diameter facing vertically upward.
8. The automatic polishing robot according to claim 7, characterized in that: The top of the dust storage box is provided with a water inlet, and the bottom of the dust storage box is provided with a drain outlet. The water inlet is used to transport clean water into the dust storage box, and the drain outlet is used to discharge sewage in the dust storage box.
9. The automatic polishing robot according to claim 1, characterized in that: The robot also includes a battery. A storage slot is provided on the chassis, and the battery is arranged in the storage slot.
10. The automatic polishing robot according to claim 1, characterized in that: The robot also includes an automatic navigation controller and an adaptive leveler, wherein the automatic navigation controller is used to plan the moving route of the walking mechanism and automatically navigate, and the adaptive leveler is used to adjust the horizontal states of the walking mechanism and the grinding mechanism to grind the ground flat.
Citation Information
Patent Citations
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