A granite workpiece polishing device and method

Abstract

This invention relates to the technical field of granite workpiece processing, and in particular to a granite workpiece grinding device and method. The device includes a frame, a gantry frame mounted on the frame via a traveling mechanism, a lifting mechanism mounted on the gantry frame, a sliding mechanism mounted on the lifting mechanism, and a grinding mechanism mounted on the sliding mechanism via a mounting mechanism. The grinding mechanism includes a granite grinding plate, a handle mounted on the granite grinding plate, and multiple diamond-shaped grooves formed on the end face of the granite grinding plate away from the handle. This invention achieves high surface grinding precision and efficiency for granite workpieces.

Description

Technical Field

[0001] This invention relates to the technical field of granite workpiece processing, and in particular to a granite workpiece grinding device and method. Background Technology

[0002] In the field of precision machinery, especially in industries such as semiconductors, the requirements for processing accuracy are extremely high. Therefore, components made of natural granite are used in semiconductor production. Compared with steel, natural granite produces less vibration and less deformation, resulting in higher precision during processing. When these natural granites are processed into corresponding parts, tools such as cutting, drilling, milling, and grinding are required. To ensure their precision, the error needs to be controlled within 0.1 micrometers during grinding. Therefore, it is difficult for conventional tools to achieve such high precision. Summary of the Invention

[0003] To improve the precision of grinding granite workpieces, this application provides a granite workpiece grinding device and method.

[0004] Firstly, this application provides a granite workpiece grinding device, which adopts the following technical solution: A granite workpiece grinding device includes a frame, a gantry frame mounted on the frame via a traveling mechanism, a lifting mechanism mounted on the gantry frame, a sliding mechanism mounted on the lifting mechanism, and a grinding mechanism mounted on the sliding mechanism via a mounting mechanism. The grinding mechanism includes a granite grinding plate, a handle mounted on the granite grinding plate, and multiple diamond-shaped grooves formed on the end face of the granite grinding plate away from the handle.

[0005] By adopting the above technical solution, after the granite workpiece undergoes rough grinding, a 1 mm grinding allowance is left on its surface. Then, the granite grinding plate is driven by the lifting mechanism, sliding mechanism, and traveling mechanism to grind the granite workpiece. Grinding paste is manually applied, and then an optical profilometer is used for measurement. Based on the measurement results, areas with insufficient precision are identified, and then the handheld granite grinding plate is used to grind these areas, thereby achieving a higher surface precision for the granite workpiece. Furthermore, the diamond-shaped grooves facilitate the discharge of grinding paste and granite powder. It also allows for gas discharge, reducing the probability of the granite grinding plate being obstructed due to pressure. Furthermore, by using the same material to manufacture the grinding plate, the extreme physical and chemical similarity between the materials is utilized to achieve a "harmonious" material removal process. In surface grinding, the flatness of the grinding tool itself directly affects the processing accuracy. If the grinding tool is much softer than the workpiece, it will wear and deform quickly, requiring frequent adjustments. If it is much harder, the workpiece surface is prone to scratches. Since similar materials have similar wear rates, the grinding tool and the workpiece can "adjust each other" to maintain good flatness together.

[0006] Optionally, the installation mechanism includes an installation block, which is mounted on the sliding mechanism via an adjustment mechanism. An installation bolt is fixedly connected to the installation block. A reserved groove is provided on the granite polishing plate, and a pre-embedded nut is fixedly connected to the reserved groove. The installation bolt is threadedly connected to the pre-embedded nut.

[0007] By adopting the above technical solution, the installation bolts and pre-embedded nuts enable the detachable connection of the granite grinding plate, thus allowing the grinding of granite workpieces to be switched between machine grinding and manual grinding. When the required precision of the distance is large, machine grinding is used to save manpower; when the required precision of the distance is small, manual grinding is used to improve the grinding accuracy.

[0008] Optionally, the adjusting mechanism includes an arc-shaped plate, which is mounted on the sliding mechanism. A rotating shaft is rotatably connected to the arc-shaped plate, and a rotating rod is fixedly connected to the rotating shaft. The rotating rod is fixedly connected to the mounting block, and a limit component is also installed on the rotating rod.

[0009] By adopting the above technical solution, different surfaces of granite workpieces need to be ground. When grinding the inclined surface of the granite workpiece, the rotating rod is first adjusted according to the inclination angle of the inclined surface so that the grinding surface of the granite grinding plate with the diamond groove is parallel to the inclined surface of the granite workpiece. Then the limiting component limits the rotating rod. Thus, grinding of different inclined surfaces of granite workpieces is realized, and the applicability of the whole device is improved.

[0010] Optionally, the limiting component includes a fourth motor, which is mounted on the sliding mechanism. A drive gear is keyed to the output shaft of the fourth motor, and a limiting gear is fixedly connected to the rotating shaft. The drive gear meshes with the limiting gear. A plurality of limiting bolts are also threaded onto the rotating rod, and an abutment block is fixedly connected to the limiting bolt.

[0011] By adopting the above technical solution, when the granite grinding plate rotates, the fourth motor starts, which drives the drive gear to rotate. The drive gear drives the rotating shaft to rotate through the limit gear, and the rotating shaft drives the rotating rod to rotate. The rotating rod drives the granite grinding plate to rotate through the mounting block. When the granite grinding plate rotates to the appropriate position, multiple limit bolts are manually rotated. The multiple limit bolts drive multiple abutment blocks to abut against the arc plate, thereby limiting the granite grinding plate. Furthermore, the setting of limit bolts and abutment blocks reduces the probability of damage to the drive gear and limit gear due to excessive force at the drive gear and limit gear.

[0012] Optionally, the traveling mechanism includes a first slide rail, which is fixedly connected to the frame. A first slider is slidably connected to the first slide rail, and the first slider is fixedly connected to the gantry frame. A first motor is also fixedly connected to the gantry frame. A first gear is keyed to the output shaft of the first motor. A first rack is also fixedly connected to the frame, and the first gear meshes with the first rack.

[0013] By adopting the above technical solution, the walking mechanism enables the longitudinal movement of the granite grinding plate, thereby allowing the granite grinding plate to grind any position of the granite workpiece in the longitudinal direction. When the granite grinding plate moves longitudinally, the first motor starts, drives the first gear to rotate, and the first gear cooperates with the first rack to drive the gantry to slide, thereby driving the granite grinding plate to move longitudinally.

[0014] Optionally, the lifting mechanism includes a second slide rail, which is fixedly connected to the gantry frame. A second slider is slidably connected to the second slide rail, and a lifting plate is fixedly connected to the second slider. A second motor is also fixedly connected to the gantry frame, and a first lead screw is fixedly connected to the output shaft of the second motor. A first lead screw nut is also installed on the lifting plate, and the first lead screw nut cooperates with the first lead screw.

[0015] By adopting the above technical solution, the lifting mechanism enables the granite grinding plate to be raised and lowered, thus allowing the granite grinding plate to grind granite workpieces of different thicknesses. When the granite grinding plate is raised and lowered, the second motor is started, which drives the first lead screw to rotate, thereby driving the lifting plate to be raised and lowered, thus realizing the raising and lowering of the granite grinding plate.

[0016] Optionally, the sliding mechanism includes a third slide rail, which is fixedly connected to the lifting plate. A third slider is slidably connected to the third slide rail, and a sliding plate is fixedly connected to the third slider. The sliding plate is fixedly connected to the arc-shaped plate. A fourth motor is mounted on the sliding plate. A third motor is also fixedly connected to the lifting plate. A second lead screw is fixedly connected to the output shaft of the third motor. A second lead screw nut is installed inside the third slider, and the second lead screw and the second lead screw nut cooperate with each other.

[0017] By adopting the above technical solution, the sliding mechanism enables the granite grinding plate to move laterally, thereby allowing the granite grinding plate to grind any position of the granite workpiece in the lateral direction. When the granite grinding plate moves laterally, the third motor starts, drives the second lead screw to rotate, and the second lead screw drives the sliding plate to slide, thereby driving the granite grinding plate to move laterally.

[0018] Secondly, this application provides a method for grinding granite workpieces, which adopts the following technical solution: A method for grinding granite workpieces includes the following steps: Step 1: Place the granite workpiece onto the machine frame using an overhead crane, and then scan the surface of the granite workpiece to be processed using an optical profilometer to measure the position that needs to be polished. Step 2: Activate the walking and sliding mechanisms according to the required grinding position, so that the granite grinding plate is above the position to be processed; Step 3: The fourth motor is started according to the inclination angle of the inclined surface. The fourth motor drives the drive gear to rotate. The drive gear drives the rotating shaft to rotate through the limit gear. The rotating shaft drives the rotating rod to rotate. The rotating rod drives the granite grinding plate to rotate through the mounting block. When the granite grinding plate rotates to the appropriate position, multiple limit bolts are manually rotated. The multiple limit bolts drive multiple abutment blocks to abut against the arc plate, thereby achieving the limitation of the granite grinding plate. Step 4: Then the second motor starts, which drives the first lead screw to rotate, thereby driving the lifting plate to descend, so that the granite grinding plate comes into contact with the granite workpiece. Step 5: Manually apply the abrasive paste to the connection between the granite grinding plate and the granite workpiece, and then start the walking mechanism and sliding mechanism to grind the granite workpiece. Step 6: When the required precision for the distance is relatively small, the granite grinding plate can be removed using the installation mechanism, and manual grinding can be used to improve the grinding precision.

[0019] In summary, this application includes the following beneficial technical effects: 1. After the granite workpiece undergoes rough grinding, a 1mm grinding allowance is left on its surface. Then, a lifting, sliding, and traveling mechanism drives the granite grinding plate to grind the workpiece. Grinding paste is manually applied, and an optical profilometer is used for measurement. Based on the profilometer's results, areas lacking precision are located, and these areas are then ground using the handheld granite grinding plate, thus achieving a higher surface finish on the granite workpiece. Furthermore, the diamond-shaped grooves facilitate the discharge of grinding paste and granite powder, and also achieve... The release of gas reduces the probability of the granite grinding plate being obstructed due to pressure. Furthermore, by using the same material to manufacture the grinding plate, the extreme physical and chemical similarity between the materials achieves a "harmonious" material removal process. In surface grinding, the flatness of the grinding tool directly affects the processing accuracy. If the grinding tool is much softer than the workpiece, it will wear and deform quickly, requiring frequent adjustments. If it is much harder, the workpiece surface is prone to scratches. Since similar materials have similar wear rates, the grinding tool and the workpiece can "mutually adjust" to maintain good flatness together. 2. The installation bolts and pre-embedded nuts enable the detachable connection of the granite grinding plate, allowing the grinding of granite workpieces to be switched between machine grinding and manual grinding. Machine grinding is used when the required precision is high, saving manpower; manual grinding is used when the required precision is low, improving the grinding accuracy. 3. Different types of granite workpieces require different surfaces to be ground. When grinding the inclined surfaces of a granite workpiece, the rotating rod is first adjusted according to the inclination angle of the inclined surface so that the grinding surface with the diamond groove on the granite grinding plate is parallel to the inclined surface of the granite workpiece. Then, the limiting component limits the rotating rod. This enables the grinding of different inclined surfaces of granite workpieces and improves the applicability of the entire device. 4. When the granite grinding plate rotates, the fourth motor starts, driving the drive gear to rotate. The drive gear drives the rotating shaft to rotate via the limit gear, which in turn drives the rotating rod to rotate. The rotating rod drives the granite grinding plate to rotate via the mounting block. When the granite grinding plate rotates to the appropriate position, multiple limit bolts are manually rotated. These limit bolts then drive multiple abutment blocks to abut against the arc-shaped plate, thereby limiting the granite grinding plate. The limit bolts and abutment blocks reduce the probability of damage to the drive gear and limit gear due to excessive force at the drive gear and limit gear. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the granite workpiece grinding device in the embodiments of this application; Figure 2 This is a schematic diagram of the walking mechanism in an embodiment of this application; Figure 3 This is a front view of the granite workpiece grinding device in the embodiments of this application; Figure 4 This is a schematic diagram of the adjustment mechanism in the embodiments of this application; Figure 5 This is an exploded view of the installation mechanism in the embodiments of this application; Figure 6 This is a schematic diagram of the grinding mechanism in the embodiments of this application.

[0021] Reference numerals in the attached drawings: 1. Frame; 2. Gantry frame; 3. Traveling mechanism; 31. First slide rail; 32. First slider; 33. First motor; 34. First gear; 35. First rack; 4. Lifting mechanism; 41. Second slide rail; 42. Second slider; 43. Lifting plate; 44. Second motor; 45. First lead screw; 5. Sliding mechanism; 51. Third slide rail; 52. Third slider; 53. Third motor; 54. Second lead screw; 55. Sliding plate; 6. Adjustment mechanism; 61. Arc plate; 62. Rotating shaft; 63. Rotating rod; 64. Limiting assembly; 641. Fourth motor; 642. Drive gear; 643. Limiting gear; 644. Limiting bolt; 645. Abutment block; 7. Installation mechanism; 71. Installation block; 72. Embedded nut; 73. Installation bolt; 8. Grinding mechanism; 81. Granite grinding plate; 811. Diamond groove; 82. Handle. Detailed Implementation

[0022] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0023] This application discloses a granite workpiece grinding device.

[0024] refer to Figure 1 A granite workpiece grinding device includes a frame 1, a gantry frame 2 mounted on the frame 1 via a traveling mechanism 3, a lifting mechanism 4 mounted on the gantry frame 2, a sliding mechanism 5 mounted on the lifting mechanism 4, and a grinding mechanism 8 mounted on the sliding mechanism 5 via an installation mechanism 7.

[0025] refer to Figure 2 The traveling mechanism 3 includes two first slide rails 31, both of which are fixedly connected to the frame 1. Each of the two first slide rails 31 is slidably connected to a first slider 32, and both first sliders 32 are fixedly connected to the gantry frame 2. The gantry frame 2 is also fixedly connected to two first motors 33, which are controlled by the same controller. Each of the output shafts of the two first motors 33 is keyed to a first gear 34. The frame 1 is also fixedly connected to two first racks 35, and the two first gears 34 mesh with the two first racks 35 respectively.

[0026] The walking mechanism 3 enables the longitudinal movement of the grinding mechanism 8, allowing the grinding mechanism 8 to grind any position of the granite workpiece in the longitudinal direction. When the grinding mechanism 8 moves longitudinally, the first motor 33 starts, drives the first gear 34 to rotate, and the first gear 34 cooperates with the first rack 35 to drive the gantry 2 to slide, thereby driving the grinding mechanism 8 to move longitudinally.

[0027] refer to Figure 3The lifting mechanism 4 includes two second slide rails 41, both of which are fixedly connected to the gantry frame 2. Second sliders 42 are slidably connected to the second slide rails 41. A lifting plate 43 is fixedly connected to one end of each of the two sliders 42, which are very close to each other. Two second motors 44 are also fixedly connected to the gantry frame 2, and are controlled by the same controller. A first lead screw 45 is fixedly connected to the output shaft of each of the two second motors 44. Two first lead screw nuts are also installed on the lifting plate 43, and these nuts cooperate with the two first lead screws 45. The lifting mechanism 4 enables the lifting of the grinding mechanism 8, allowing it to grind granite workpieces of different thicknesses. When the grinding mechanism 8 is being lifted, the second motors 44 are activated, driving the first lead screws 45 to rotate, which in turn drives the lifting plate 43 to rise and fall, thus achieving the lifting of the grinding mechanism 8.

[0028] The sliding mechanism 5 includes a third slide rail 51, which is fixedly connected to the lifting plate 43. Two third sliders 52 are slidably connected to the third slide rail 51, and a sliding plate 55 is fixedly connected to both third sliders 52. A third motor 53 is also fixedly connected to the lifting plate 43. A second lead screw 54 is fixedly connected to the output shaft of the third motor 53. A second lead screw nut is installed inside the third slider 52, and the second lead screw 54 cooperates with the second lead screw nut. The sliding mechanism 5 enables the lateral movement of the grinding mechanism 8, allowing the grinding mechanism 8 to grind any position of the granite workpiece in the lateral direction. When the grinding mechanism 8 moves laterally, the third motor 53 starts, drives the second lead screw 54 to rotate, and the second lead screw 54 drives the sliding plate 55 to slide, thereby driving the grinding mechanism 8 to move laterally.

[0029] refer to Figure 4 An adjustment mechanism 6 is installed on the sliding plate 55. The adjustment mechanism 6 includes an arc plate 61, which is fixedly connected to the sliding plate 55. A rotating shaft 62 is rotatably connected to the arc plate 61. A rotating rod 63 is fixedly connected to the rotating shaft 62. The rotating rod 63 is connected to the grinding mechanism 8 through the mounting mechanism 7. A limit component 64 is also installed on the rotating rod 63. The limit component 64 includes a fourth motor 641, which is fixedly connected to the sliding plate 55. A drive gear 642 is keyed to the output shaft of the fourth motor 641. A limit gear 643 is fixedly connected to the rotating shaft 62. The drive gear 642 meshes with the limit gear 643. Multiple limit bolts 644 are threadedly connected to the rotating rod 63. An abutment block 645 is fixedly connected to the limit bolts 644.

[0030] Different types of granite workpieces require different surfaces to be ground. When grinding the inclined surfaces of a granite workpiece, the fourth motor 641 is started according to the inclination angle of the inclined surface. The fourth motor 641 drives the drive gear 642 to rotate. The drive gear 642 drives the rotating shaft 62 to rotate through the limit gear 643. The rotating shaft 62 drives the rotating rod 63 to rotate. The rotating rod 63 drives the grinding mechanism 8 to rotate through the mounting mechanism 7. When the grinding mechanism 8 rotates to the appropriate position, multiple limit bolts 644 are manually rotated. The multiple limit bolts 644 drive multiple abutment blocks 645 to abut against the arc plate 61, thereby limiting the grinding mechanism 8. The setting of the limit bolts 644 and the abutment blocks 645 reduces the probability of damage to the drive gear 642 and the limit gear 643 due to the large force at the drive gear 642 and the limit gear 643. Thus, it realizes the grinding of different inclined surfaces of granite workpieces and improves the applicability of the entire device.

[0031] refer to Figure 5 and Figure 6 The grinding mechanism 8 includes a granite grinding plate 81, on which a handle 82 is installed. Multiple diamond-shaped grooves 811 are formed on the end face of the granite grinding plate 81 away from the handle 82. The mounting mechanism 7 includes a mounting block 71, which is fixedly connected to the rotating rod 63. Mounting bolts 73 are fixedly connected to the mounting block 71. A reserved groove is formed on the granite grinding plate 81, and a pre-embedded nut 72 is fixedly connected in the reserved groove. The mounting bolts 73 are threadedly connected to the pre-embedded nut 72.

[0032] After the granite workpiece undergoes rough grinding, a 1mm grinding allowance is left on its surface. Then, the granite grinding plate 81 is driven by the lifting mechanism 4, sliding mechanism 5, and traveling mechanism 3 to grind the granite workpiece. Grinding paste is manually applied, and an optical profilometer is used for measurement. Based on the measurement results, areas lacking precision are identified, and the handheld granite grinding plate 81 is used to grind these areas, thus achieving a higher surface precision for the granite workpiece. Furthermore, the diamond-shaped groove 811 facilitates the discharge of grinding paste and granite powder, as well as gas, reducing the probability of the granite grinding plate 81's sliding being obstructed due to pressure. Additionally, by using the same material for the grinding plate, [the process is more efficient]. By leveraging the extreme physical and chemical similarity between materials, a "harmonious" material removal process is achieved. In surface grinding, the flatness of the grinding wheel directly affects the machining accuracy. If the grinding wheel is much softer than the workpiece, it will wear and deform quickly, requiring frequent adjustments. If it is much harder, the workpiece surface is prone to scratches. Since similar materials have similar wear rates, the grinding wheel and workpiece can "mutually adjust" to maintain good flatness. Furthermore, the installation bolts 73 and pre-embedded nuts 72 enable the detachable connection of the granite grinding plate 81, allowing the grinding of granite workpieces to be switched between machine grinding and manual grinding. Machine grinding is used when the required precision is high, saving manpower; manual grinding is used when the required precision is low, improving grinding accuracy.

[0033] This application also discloses a method for grinding granite workpieces.

[0034] A method for grinding granite workpieces includes the following steps: Step 1: Place the granite workpiece onto frame 1 using an overhead crane, and then scan the surface of the granite workpiece to be processed using an optical profilometer to measure the position that needs to be polished. Step 2: Activate the walking mechanism 3 and the sliding mechanism 5 according to the position to be polished, so that the granite polishing plate 81 is above the position to be processed; Step 3: The fourth motor 641 is started according to the tilt angle of the inclined surface. The fourth motor 641 drives the drive gear 642 to rotate. The drive gear 642 drives the rotating shaft 62 to rotate through the limit gear 643. The rotating shaft 62 drives the rotating rod 63 to rotate. The rotating rod 63 drives the granite grinding plate 81 to rotate through the mounting block 71. When the granite grinding plate 81 rotates to the appropriate position, multiple limit bolts 644 are manually rotated. The multiple limit bolts 644 drive multiple abutment blocks 645 to abut against the arc plate 61, thereby achieving the limitation of the granite grinding plate 81. Step 4: Then the second motor 44 starts, and the second motor 44 drives the first lead screw 45 to rotate, which in turn drives the lifting plate 43 to descend, so that the granite grinding plate 81 comes into contact with the granite workpiece. Step 5: Manually apply the abrasive paste to the connection between the granite grinding plate 81 and the granite workpiece, and then start the walking mechanism 3 and the sliding mechanism 5 to grind the granite workpiece. Step 6: When the required precision of the distance is small, remove the granite grinding plate 81 through the installation mechanism 7 and use manual grinding to improve the grinding precision.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A granite workpiece grinding device, characterized in that, The machine includes a frame (1), on which a gantry (2) is mounted via a walking mechanism (3), a lifting mechanism (4) is mounted on the gantry (2), a sliding mechanism (5) is mounted on the lifting mechanism (4), and a grinding mechanism (8) is mounted on the sliding mechanism (5) via an installation mechanism (7). The grinding mechanism (8) includes a granite grinding plate (81), on which a handle (82) is mounted, and multiple diamond-shaped grooves (811) are formed on the end face of the granite grinding plate (81) away from the handle (82).

2. The granite workpiece grinding device according to claim 1, characterized in that, The installation mechanism (7) includes an installation block (71), which is installed on the sliding mechanism (5) via an adjustment mechanism (6). An installation bolt (73) is fixedly connected to the installation block (71). A reserved groove is provided on the granite grinding plate (81), and a pre-embedded nut (72) is fixedly connected in the reserved groove. The installation bolt (73) is threadedly connected to the pre-embedded nut (72).

3. The granite workpiece grinding device according to claim 2, characterized in that, The adjustment mechanism (6) includes an arc plate (61), which is mounted on the sliding mechanism (5). A rotating shaft (62) is rotatably connected to the arc plate (61), and a rotating rod (63) is fixedly connected to the rotating shaft (62). The rotating rod (63) is fixedly connected to the mounting block (71), and a limit assembly (64) is also installed on the rotating rod (63).

4. The granite workpiece grinding device according to claim 3, characterized in that, The limiting component (64) includes a fourth motor (641), which is mounted on the sliding mechanism (5). A drive gear (642) is keyed to the output shaft of the fourth motor (641). A limiting gear (643) is fixedly connected to the rotating shaft (62). The drive gear (642) meshes with the limiting gear (643). A plurality of limiting bolts (644) are also threaded onto the rotating rod (63). An abutment block (645) is fixedly connected to the limiting bolt (644).

5. The granite workpiece grinding device according to claim 4, characterized in that, The walking mechanism (3) includes a first slide rail (31), which is fixedly connected to the frame (1). A first slider (32) is slidably connected to the first slide rail (31). The first slider (32) is fixedly connected to the gantry frame (2). A first motor (33) is also fixedly connected to the gantry frame (2). A first gear (34) is keyed to the output shaft of the first motor (33). A first rack (35) is also fixedly connected to the frame (1). The first gear (34) meshes with the first rack (35).

6. The granite workpiece grinding device according to claim 5, characterized in that, The lifting mechanism (4) includes a second slide rail (41), which is fixedly connected to the gantry frame (2). A second slider (42) is slidably connected to the second slide rail (41). A lifting plate (43) is fixedly connected to the second slider (42). A second motor (44) is also fixedly connected to the gantry frame (2). A first lead screw (45) is fixedly connected to the output shaft of the second motor (44). A first lead screw nut is also installed on the lifting plate (43). The first lead screw nut cooperates with the first lead screw (45).

7. The granite workpiece grinding device according to claim 6, characterized in that, The sliding mechanism (5) includes a third slide rail (51), which is fixedly connected to the lifting plate (43). A third slider (52) is slidably connected to the third slide rail (51). A sliding plate (55) is fixedly connected to the third slider (52). The sliding plate (55) is fixedly connected to the arc plate (61). A fourth motor (641) is mounted on the sliding plate (55). A third motor (53) is also fixedly connected to the lifting plate (43). A second lead screw (54) is fixedly connected to the output shaft of the third motor (53). A second lead screw nut is installed inside the third slider (52). The second lead screw (54) cooperates with the second lead screw nut.

8. A method for grinding granite workpieces, characterized in that, Grinding granite workpieces using the granite workpiece grinding device according to claim 7 includes the following steps: Step 1: Place the granite workpiece onto the frame (1) using an overhead crane, and then scan the surface of the granite workpiece to be processed using an optical profilometer to measure the position that needs to be polished; Step 2: Activate the walking mechanism (3) and sliding mechanism (5) according to the position to be polished, so that the granite polishing plate (81) is above the position to be processed; Step 3: The fourth motor (641) is started according to the tilt angle of the inclined surface. The fourth motor (641) drives the drive gear (642) to rotate. The drive gear (642) drives the rotating shaft (62) to rotate through the limit gear (643). The rotating shaft (62) drives the rotating rod (63) to rotate. The rotating rod (63) drives the granite grinding plate (81) to rotate through the mounting block (71). When the granite grinding plate (81) rotates to the appropriate position, multiple limit bolts (644) are manually rotated. The multiple limit bolts (644) drive multiple abutment blocks (645) to abut against the arc plate (61) respectively, thereby realizing the limitation of the granite grinding plate (81). Step 4: Then the second motor (44) starts, and the second motor (44) drives the first lead screw (45) to rotate, which in turn drives the lifting plate (43) to descend, so that the granite grinding plate (81) comes into contact with the granite workpiece. Step 5: Manually apply the abrasive paste to the connection between the granite grinding plate (81) and the granite workpiece, and then start the walking mechanism (3) and the sliding mechanism (5) to grind the granite workpiece; Step 6: When the required precision of the distance is small, the granite grinding plate (81) is removed by the installation mechanism (7) and manual grinding is used to improve the grinding precision.

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