Floor grinder capable of avoiding height differences

Abstract

The application discloses a floor grinder capable of avoiding height difference, relates to the technical field of floor grinding, and comprises a vehicle frame, a motor control device is arranged on the top of the vehicle frame, a dust collector is fixedly installed on the right side of the vehicle frame, wheels are rotatably installed on the bottom of the vehicle frame, a water tank is fixedly installed on the bottom of the vehicle frame, a water level monitoring device is arranged in the water tank, a lifting arm is rotatably installed on the left side of the vehicle frame, a shell is fixedly installed on the left side of the lifting arm, an anti-splashing device is arranged in the shell, a protection device is arranged on the left side of the shell, a heat dissipation device is arranged in the shell, and the anti-splashing device comprises a motor, a rotating shaft, a grinding head, a protruding block, a push rod, an inclined rod, a blocking ring, an elastic telescopic rod, a moving ring and an inclined block. The high points or uneven areas on the road surface are removed through the rotation of the grinding head, the road surface flatness is improved, the expansion of future cracks is reduced, the aging of the road surface is delayed, and long-term durability is improved.

Description

Technical Field

[0001] This invention relates to the field of floor grinding technology, specifically to a floor grinding machine that can avoid height differences. Background Technology

[0002] Floor grinders that can avoid height differences are typically used for grinding, polishing, cleaning, and repairing concrete or stone floors. They are usually equipped with multiple grinding discs or tools to smooth and level the surface through rotation and grinding, thus achieving the purpose of repairing, decorating, or improving the quality of the floor.

[0003] Patent publication number CN206010659U relates to the field of floor grinding technology, and proposes an intelligent floor grinding robot. The intelligent floor grinding robot includes a traction device, a grinding device, and a water suction device. The traction device is located at the front end of the floor grinding robot; the grinding device and the water suction device are located at the bottom of the robot. The floor grinding robot also includes a control system, which, upon receiving control commands, drives the traction device, grinding device, and water suction device to work together, enabling the floor grinding robot to move fully automatically, grind stone, and clean up waste generated during the grinding process. This patented floor grinding robot not only improves work efficiency and saves costs, but also reduces the harm of dust to workers in the working environment.

[0004] In the aforementioned patent, the traction device, grinding device, and water suction device work together to enable the floor grinding robot to move, grind stone, and clean up the waste generated during the grinding process in a fully automatic manner. However, it is difficult to handle the stone fragments generated during the grinding process and it is difficult to protect the grinding device. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a floor grinding machine that can avoid height differences, thus solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a floor grinder that avoids height differences, comprising a frame, an electronic control device on the top of the frame, a vacuum cleaner fixedly mounted on the right side of the frame, wheels rotatably mounted on the bottom of the frame, a water tank fixedly mounted on the bottom of the frame, a water level monitoring device inside the water tank, a lifting arm rotatably mounted on the left side of the frame, a housing fixedly mounted on the left side of the lifting arm, an anti-splash device inside the housing, a protective device on the left side of the housing, and a heat dissipation device inside the housing; The splash-proof device includes a motor, a rotating shaft, a grinding head, a protrusion, a push rod, a beveled rod, a retaining ring, an elastic telescopic rod, a moving ring, and a beveled block. The motor is fixedly installed on the top of the housing. The rotating shaft is fixedly installed on the output end of the motor. The grinding head is fixedly installed on the end of the rotating shaft away from the output end of the motor. The protrusion is fixedly installed on the circumferential surface of the rotating shaft. The push rod is slidably installed on the inner wall of the housing. The beveled rod is slidably installed on the inner wall of the housing. The retaining ring is fixedly installed on the bottom of the housing. The elastic telescopic rod is fixedly installed on the inner wall of the housing. The moving ring is fixedly installed on the movable end of the elastic telescopic rod. The beveled block is fixedly installed on the top of the moving ring. The motor drives the rotating shaft to start rotating. The rotation of the rotating shaft drives the grinding head to start rotating. The rotation of the grinding head removes high points or uneven areas on the road surface.

[0007] According to the above technical solution, the side of the protrusion that contacts the push rod is set as an inclined surface, the side of the push rod that contacts the inclined rod is set as an inclined surface, the side of the inclined rod that contacts the inclined block is set as an inclined surface, and a spring is provided between the inclined rod and the inner wall of the outer shell. By setting the inclined surface, it is ensured that the protrusion can smoothly push the push rod when rotating, the push rod can smoothly push the inclined rod when moving, the inclined rod can smoothly push the inclined block when moving, and the spring is provided to ensure that the inclined rod can achieve self-reset.

[0008] According to the above technical solution, the protective device includes a rack, two rotating columns, a transmission belt, a gear, a sliding column, and a baffle. The rack is fixedly installed on the back of the moving ring. The two rotating columns are rotatably installed on the top of the retaining ring and are connected by the transmission belt. The gear is fixedly installed on the circumferential surface of the rotating columns. The sliding column slides through the outer shell. The baffle is fixedly installed at the end of the sliding column away from the inner wall of the outer shell. The movement of the rack causes the gear to start rotating. The rotation of the gear causes the rotating columns to start rotating. The rotation of the rotating columns causes the transmission belt to start rotating. The rotation of the transmission belt causes the sliding column to start moving. The movement of the sliding column pushes the baffle to start moving.

[0009] According to the above technical solution, the protective device further includes a sliding rod, a push plate, an elastic telescopic block, a U-shaped rod, and a pulley. The sliding rod slides through the outer shell, the push plate is fixedly installed at the end of the sliding rod away from the inner wall of the outer shell, the elastic telescopic block is fixedly installed on the top of the push plate, the U-shaped rod slides through the retaining ring, and the pulley is rotatably installed at the bottom of the U-shaped rod. The elastic telescopic block retracts the push plate downwards, causing the sliding rod to start moving. The movement of the sliding rod pushes the U-shaped rod to start moving. The movement of the U-shaped rod causes the pulley at its bottom to contact the ground and support the outer shell.

[0010] According to the above technical solution, the rack and pinion mesh with the gear, the end of the sliding column near the inner wall of the outer shell is fixedly installed on the top of the transmission belt, the side of the slide rod that contacts the U-shaped rod is set as an inclined surface, the side of the elastic telescopic block that contacts the baffle is set as an inclined surface, and a spring is provided between the U-shaped rod and the inner wall of the outer shell. The meshing ensures that the rack and pinion can drive the gear to rotate when moving, the fixed installation ensures that the transmission belt can drive the sliding column to move when rotating, the inclined surface ensures that the slide rod can smoothly push the U-shaped rod when moving, the inclined surface ensures that the elastic telescopic block can smoothly retract, and the spring ensures that the U-shaped rod can achieve self-reset.

[0011] According to the above technical solution, the heat dissipation device includes a second motor, a rotating rod, and a fan. The second motor is fixedly installed on the top of the inner wall of the outer casing, the rotating rod is fixedly installed on the output end of the second motor, and the fan is fixedly installed on the circumferential surface of the rotating rod. The second motor drives the rotating rod to start rotating, and the rotation of the rotating rod drives the fan to start rotating. The rotation of the fan accelerates the air circulation, which can effectively remove the heat generated when the grinding head is working.

[0012] According to the above technical solution, the heat dissipation device further includes a second gear, a protective plate, a connecting rod, and a second rack. The second gear is fixedly installed on the circumferential surface of the rotating rod. The protective plate is rotatably installed on the top of the inner wall of the outer casing. The second rack is slidably installed on the bottom of the second motor. One end of the connecting rod is slidably installed on the front of the protective plate, and the other end of the connecting rod is fixedly installed on the front of the second rack. When the rotating rod rotates, it drives the second gear to start rotating. The rotation of the second gear drives the second rack to start moving. The movement of the second rack drives the connecting rod to start moving. The movement of the connecting rod drives the protective plate to start rotating. The rotating protective plate comes into contact with and engages with another protective plate.

[0013] According to the above technical solution, the second gear meshes with the second rack, and a third spring is provided between the guard plate and the top of the inner wall of the outer shell. The meshing ensures that the second gear can drive the second rack to move when rotating, and the third spring ensures that the guard plate can achieve self-reset.

[0014] This invention provides a floor grinding machine that can avoid height differences. It has the following beneficial effects:

[0015] (1) In this invention, the grinding head is driven to start rotating by the rotation of the shaft. The rotation of the grinding head removes high points or uneven areas on the road surface, improves the smoothness of the road surface, and the grinding can reduce the further expansion of future cracks and delay the aging process of the road surface, thereby improving its long-term durability. The gap between the grinding head and the outer shell is sealed by the movement of the moving ring and the cooperation of the retaining ring, ensuring that no excessive grinding debris, stone chips or other impurities enter the inside of the grinding machine, reducing the wear of these impurities on the machine, transmission system or motor, and preventing the flying of stone chips generated during grinding from causing damage to other parts inside the outer shell.

[0016] (2) In this invention, the sliding column moves to push the baffle to start moving. The movement of the baffle can effectively prevent the floor grinder from making direct contact with obstacles during the grinding process, thereby reducing the chance of the machine being scratched or bumped, reducing damage to the surface of the grinder, and extending the service life of the equipment. The sliding rod moves to push the U-shaped rod to start moving. The movement of the U-shaped rod causes the pulley at its bottom to contact the ground and support the outer shell, ensuring that the outer shell can pass smoothly through the protrusion and will not cause unexpected machine stoppage due to road protrusion, thus reducing working time.

[0017] (3) In this invention, the rotating rod drives the fan to start rotating. The fan rotation accelerates air circulation, which can effectively remove the heat generated by the grinding head during operation, reduce the temperature of the machine body and grinding head, reduce failures and losses caused by overheating, and prevent excessive temperature from causing adhesion or uneven grinding on the floor surface. The guard plate rotates and contacts and splices with another guard plate. After the guard plates contact and splice with each other, they protect the fan during the rotation of the fan, effectively blocking the entry of dust, debris and other foreign objects, ensuring the long-term normal operation of the fan, and ensuring that the fan will not be hit by gravel and other foreign objects generated during grinding, causing the fan to be damaged and stop working normally. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the housing and motor of the present invention; Figure 3 This is a cross-sectional view of the outer shell structure of the present invention; Figure 4 This is a cross-sectional schematic diagram of the structure of the motor and grinding head of the present invention; Figure 5 This is a cross-sectional schematic diagram of the anti-splash device of the present invention; Figure 6 This is a cross-sectional schematic diagram of the protective device structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of section A in the middle; Figure 8 This is a cross-sectional schematic diagram of the slide bar and U-shaped bar structure of the present invention; Figure 9 This is a cross-sectional view of the heat dissipation device structure of the present invention; Figure 10 This is a cross-sectional schematic diagram of the guard plate and connecting rod structure of the present invention.

[0019] In the diagram: 1. Frame; 2. Electronic control device; 3. Vacuum cleaner; 4. Wheel; 5. Water tank; 6. Lifting arm; 7. Outer shell; 8. Motor 1; 9. Shaft; 10. Grinding head; 11. Protrusion; 12. Push rod; 13. Inclined rod; 14. Retaining ring; 15. Elastic telescopic rod; 16. Moving ring; 17. Inclined block; 181. Rack 1; 182. Rotating column; 183. Drive belt; 184. Gear 1; 185. Sliding column; 186. Baffle; 187. Slide rod; 188. Push plate; 189. Elastic telescopic block; 1810. U-shaped rod; 1811. Pulley; 191. Motor 2; 192. Rotating rod; 193. Fan; 194. Gear 2; 195. Guard plate; 196. Connecting rod; 197. Rack 2. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-10 One embodiment of the present invention is: a floor grinder that can avoid height differences, including a frame 1, an electronic control device 2 on the top of the frame 1, a vacuum cleaner 3 fixedly installed on the right side of the frame 1, a wheel 4 rotatably installed on the bottom of the frame 1, a water tank 5 fixedly installed on the bottom of the frame 1, a water level monitoring device installed inside the water tank 5, a lifting arm 6 rotatably installed on the left side of the frame 1, a housing 7 fixedly installed on the left side of the lifting arm 6, and an anti-splash device installed inside the housing 7; The anti-splash device includes a motor 8, a rotating shaft 9, a grinding head 10, a protrusion 11, a push rod 12, a ramp 13, a retaining ring 14, an elastic telescopic rod 15, a moving ring 16, and a ramp block 17. The motor 8 is fixedly installed on the top of the housing 7, the rotating shaft 9 is fixedly installed on the output end of the motor 8, the grinding head 10 is fixedly installed on the end of the rotating shaft 9 away from the output end of the motor 8, the protrusion 11 is fixedly installed on the circumferential surface of the rotating shaft 9, the push rod 12 is slidably installed on the inner wall of the housing 7, the ramp 13 is slidably installed on the inner wall of the housing 7, the retaining ring 14 is fixedly installed on the bottom of the housing 7, the elastic telescopic rod 15 is fixedly installed on the inner wall of the housing 7, the moving ring 16 is fixedly installed on the movable end of the elastic telescopic rod 15, and the ramp block 17 is fixedly installed on the top of the moving ring 16. The rotating shaft 9 drives the grinding head 10 to start rotating. The rotation of the grinding head 10 removes high points or uneven areas on the road surface, improving the smoothness of the road surface. Grinding can reduce the further expansion of future cracks, delay the aging process of the road surface, and thus improve its long-term durability.

[0022] The side of the protrusion 11 that contacts the push rod 12 is set as an inclined surface, the side of the push rod 12 that contacts the inclined rod 13 is set as an inclined surface, the side of the inclined rod 13 that contacts the inclined block 17 is set as an inclined surface, and a spring is provided between the inclined rod 13 and the inner wall of the outer casing 7. By setting the inclined surface, it is ensured that the protrusion 11 can smoothly push the push rod 12 when rotating, the push rod 12 can smoothly push the inclined rod 13 when moving, the inclined rod 13 can smoothly push the inclined block 17 when moving, and the spring is provided to ensure that the inclined rod 13 can achieve self-reset.

[0023] In this embodiment, during operation: First, the vehicle frame 1 is placed on the road surface where work is to be done. After confirming the working environment is safe, the electronic control system 2 is activated. After activation, the lifting arm 6 rotates to bring the grinding head 10 into contact with the road surface. Then, the electronic control system 2 drives the vacuum cleaner 3 and wheels 4 to start working. After the vehicle frame 1 begins to move, the motor 8 is activated, causing the rotating shaft 9 to rotate. The rotation of the rotating shaft 9 drives the grinding head 10 to rotate. The grinding head 10 removes high points or uneven areas on the road surface, improving the smoothness of the road surface. Grinding can reduce the further expansion of future cracks and delay the aging process of the road surface, thereby improving its long-term durability. At the same time as the rotating shaft 9 rotates, the protrusion 11 also begins to rotate. 1. Rotating push rod 12 starts to move. Push rod 12 moves and pushes inclined rod 13 to move. Inclined rod 13 moves and pushes inclined block 17 to move. Inclined block 17 moves and drives moving ring 16 to move. Moving ring 16 moves and cooperates with retaining ring 14 to seal the gap between grinding head 10 and housing 7, ensuring that too much grinding debris, stone chips or other impurities do not enter the grinding machine, reducing the wear of these impurities on the machine, transmission system or motor, and preventing the flying of grinding stones from damaging other parts inside housing 7. During grinding, water tank 5 pumps water out to cool and reduce dust. At the same time, the water level monitoring device inside water tank 5 will detect the water level inside water tank 5 in real time to ensure that water tank 5 does not run out of water.

[0024] Please see Figures 1-10Based on the above embodiments, in another embodiment of the present invention, a protective device is provided on the left side of the outer casing 7, and a heat dissipation device is provided inside the outer casing 7. The protective device includes a rack 181, two rotating columns 182, a transmission belt 183, a gear 184, a sliding column 185, and a baffle 186. The rack 181 is fixedly installed on the back of the moving ring 16, the two rotating columns 182 are rotatably installed on the top of the retaining ring 14, and the two rotating columns 182 are connected by transmission belt 183. The gear 184 is fixedly installed on the circumferential surface of the rotating column 182, the sliding column 185 slides through the outer casing 7, and the baffle 186 is fixedly installed on the end of the sliding column 185 away from the inner wall of the outer casing 7. The movement of the sliding column 185 pushes the baffle 186 to start moving. The movement of the baffle 186 can effectively prevent the floor grinder from making direct contact with obstacles during the grinding process, thereby reducing the chance of the machine body being scratched or bumped, reducing damage to the surface of the grinder, and extending the service life of the equipment.

[0025] The protective device also includes a slide rod 187, a push plate 188, an elastic telescopic block 189, a U-shaped rod 1810, and a pulley 1811. The slide rod 187 slides through the outer casing 7. The push plate 188 is fixedly installed at the end of the slide rod 187 away from the inner wall of the outer casing 7. The elastic telescopic block 189 is fixedly installed on the top of the push plate 188. The U-shaped rod 1810 slides through the retaining ring 14. The pulley 1811 is rotatably installed at the bottom of the U-shaped rod 1810. The movement of the slide rod 187 pushes the U-shaped rod 1810 to start moving. The movement of the U-shaped rod 1810 causes the pulley 1811 at its bottom to contact the ground and support the outer casing 7, ensuring that the outer casing 7 can pass smoothly through the protrusion and will not cause unexpected shutdown due to the road surface protrusion, thus reducing working time.

[0026] Rack 181 meshes with gear 184. The end of sliding column 185 near the inner wall of housing 7 is fixedly installed on the top of transmission belt 183. The side of sliding rod 187 that contacts U-shaped rod 1810 is set as an inclined surface. The side of elastic telescopic block 189 that contacts baffle 186 is set as an inclined surface. A second spring is provided between U-shaped rod 1810 and inner wall of housing 7. The meshing ensures that rack 181 can drive gear 184 to rotate when it moves. The fixed installation ensures that transmission belt 183 can drive sliding column 185 to move when it rotates. The inclined surface ensures that sliding rod 187 can smoothly push U-shaped rod 1810 when it moves. The inclined surface ensures that elastic telescopic block 189 can smoothly retract. The second spring ensures that U-shaped rod 1810 can achieve self-reset.

[0027] The heat dissipation device includes a second motor 191, a rotating rod 192, and a fan 193. The second motor 191 is fixedly installed on the top of the inner wall of the outer casing 7. The rotating rod 192 is fixedly installed on the output end of the second motor 191. The fan 193 is fixedly installed on the circumferential surface of the rotating rod 192. The rotation of the rotating rod 192 drives the fan 193 to start rotating. The rotation of the fan 193 accelerates the air circulation, which can effectively remove the heat generated by the grinding head 10 during operation, reduce the temperature of the machine body and the grinding head 10, reduce failures and wear caused by overheating, and prevent excessively high temperatures from causing adhesion or uneven grinding on the floor surface.

[0028] The heat dissipation device also includes a second gear 194, a protective plate 195, a connecting rod 196, and a second rack 197. The second gear 194 is fixedly installed on the circumferential surface of the rotating rod 192. The protective plate 195 is rotatably installed on the top of the inner wall of the outer casing 7. The second rack 197 is slidably installed on the bottom of the second motor 191. One end of the connecting rod 196 is slidably installed on the front of the protective plate 195, and the other end of the connecting rod 196 is fixedly installed on the front of the second rack 197. The protective plate 195 rotates and contacts and engages with another protective plate 195. After the protective plates 195 contact and engage with each other, they protect the fan 193 during rotation, effectively blocking the entry of dust, debris, and other foreign objects, ensuring the long-term normal operation of the fan 193, and ensuring that the fan 193 will not be damaged or stop working properly due to being hit by gravel or other foreign objects generated during grinding.

[0029] Gear 2 194 meshes with rack 2 197. A spring 3 is provided between the guard plate 195 and the top of the inner wall of the outer casing 7. The meshing ensures that gear 2 194 can drive rack 2 197 to move when it rotates. The spring 3 ensures that the guard plate 195 can achieve self-reset.

[0030] In this embodiment, during operation: The moving ring 16 moves simultaneously with the rack 181, which in turn moves the gear 184, which in turn rotates the rotating column 182, which in turn rotates the transmission belt 183, which in turn moves the sliding column 185, which in turn pushes the baffle 186 to move. The movement of the baffle 186 effectively prevents the floor grinder from directly contacting obstacles during the grinding process, thereby reducing the chance of scratches and impacts to the machine body, minimizing damage to the grinder surface, and extending the equipment's service life. Simultaneously, the push plate 188 is pushed to move, and the movement of the push plate 188 causes the slide rod 187 to move. The movement of the slide rod 187 stops pushing the U-shaped rod 1810, and the U-shaped rod 1810 begins to return to its original position under the action of the second spring. Subsequently, when the push plate 188 encounters a high part of the road surface protrusion, it is pushed, and the elastic telescopic block 189 retracts downward, causing the push plate 188 to move and the slide rod 187 to move. The movement of the slide rod 187 pushes the U-shaped rod 1810 to move, and the movement of the U-shaped rod 1810 causes its bottom pulley 1811 to contact the ground, supporting the outer casing 7 and ensuring that the outer casing 7 can pass smoothly through the protrusion, without causing unexpected machine stoppage due to the road surface protrusion, thus reducing working time.

[0031] When grinding the road surface begins, motor 191 is started, driving the rotating rod 192 to rotate. The rotation of the rotating rod 192 drives the fan 193 to rotate, accelerating airflow and effectively removing the heat generated by the grinding head 10 during operation. This reduces the temperature of the machine body and grinding head 10, minimizing malfunctions and wear caused by overheating, and preventing excessive heat from causing adhesion or uneven grinding on the floor surface. Simultaneously, the rotation of the rotating rod 192 drives gear 194 to rotate, which in turn... The second moving rack 197 begins to move, which in turn drives the connecting rod 196 to move. The connecting rod 196 then drives the guard plate 195 to rotate. The rotating guard plate 195 comes into contact with and engages with another guard plate 195. After the guard plates 195 come into contact with and engage with each other, they protect the fan 193 during its rotation, effectively blocking the entry of dust, debris and other foreign objects, ensuring the long-term normal operation of the fan 193, and preventing the fan 193 from being hit by gravel or other foreign objects generated during grinding, which could cause the fan 193 to be damaged, stop and fail to work properly.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A floor grinding machine capable of avoiding height differences, comprising a frame (1), characterized in that: An electronic control device (2) is provided on the top of the frame (1), a vacuum cleaner (3) is fixedly installed on the right side of the frame (1), a wheel (4) is rotatably installed on the bottom of the frame (1), a water tank (5) is fixedly installed on the bottom of the frame (1), a water level monitoring device is provided inside the water tank (5), a lifting arm (6) is rotatably installed on the left side of the frame (1), a housing (7) is fixedly installed on the left side of the lifting arm (6), an anti-splash device is provided inside the housing (7), a protective device is provided on the left side of the housing (7), and a heat dissipation device is provided inside the housing (7). The splash-proof device includes a motor (8), a rotating shaft (9), a grinding head (10), a protrusion (11), a push rod (12), a sloped rod (13), a retaining ring (14), an elastic telescopic rod (15), a moving ring (16), and a sloped block (17). The motor (8) is fixedly installed on the top of the outer shell (7). The rotating shaft (9) is fixedly installed on the output end of the motor (8). The grinding head (10) is fixedly installed on the end of the rotating shaft (9) away from the output end of the motor (8). The protrusion (11) is fixedly installed on the circumferential surface of the rotating shaft (9). The push rod (12) is slidably installed on the inner wall of the outer shell (7). The sloped rod (13) is slidably installed on the inner wall of the outer shell (7). The retaining ring (14) is fixedly installed on the bottom of the outer shell (7). The elastic telescopic rod (15) is fixedly installed on the inner wall of the outer shell (7). The moving ring (16) is fixedly installed on the movable end of the elastic telescopic rod (15). The sloped block (17) is fixedly installed on the top of the moving ring (16). The protective device includes a rack (181), two rotating columns (182), a transmission belt (183), a gear (184), a sliding column (185), and a baffle (186). The rack (181) is fixedly installed on the back of the moving ring (16). The two rotating columns (182) are rotatably installed on the top of the retaining ring (14). The two rotating columns (182) are connected by transmission belt (183). The gear (184) is fixedly installed on the circumferential surface of the rotating column (182). The sliding column (185) slides through the outer shell (7). The baffle (186) is fixedly installed at the end of the sliding column (185) away from the inner wall of the outer shell (7). The protective device also includes a slide rod (187), a push plate (188), an elastic telescopic block (189), a U-shaped rod (1810), and a pulley (1811). The slide rod (187) slides through the outer shell (7). The push plate (188) is fixedly installed at one end of the slide rod (187) away from the inner wall of the outer shell (7). The elastic telescopic block (189) is fixedly installed on the top of the push plate (188). The U-shaped rod (1810) slides through the retaining ring (14). The pulley (1811) is rotatably installed at the bottom of the U-shaped rod (1810).

2. The floor grinding machine according to claim 1, characterized in that: The side of the protrusion (11) that contacts the push rod (12) is set as an inclined surface, the side of the push rod (12) that contacts the inclined rod (13) is set as an inclined surface, the side of the inclined rod (13) that contacts the inclined block (17) is set as an inclined surface, and a spring is provided between the inclined rod (13) and the inner wall of the outer shell (7).

3. A floor grinding machine that can avoid height differences according to claim 2, characterized in that: The rack (181) meshes with the gear (184), the sliding column (185) is fixedly installed on the top of the transmission belt (183) at one end near the inner wall of the outer shell (7), the side of the slide rod (187) that contacts the U-shaped rod (1810) is set as an inclined surface, the side of the elastic telescopic block (189) that contacts the baffle (186) is set as an inclined surface, and a spring is provided between the U-shaped rod (1810) and the inner wall of the outer shell (7).

4. A floor grinding machine that can avoid height differences according to claim 3, characterized in that: The heat dissipation device includes a second motor (191), a rotating rod (192), and a fan (193). The second motor (191) is fixedly installed on the top of the inner wall of the outer casing (7). The rotating rod (192) is fixedly installed on the output end of the second motor (191). The fan (193) is fixedly installed on the circumferential surface of the rotating rod (192).

5. A floor grinding machine that can avoid height differences according to claim 4, characterized in that: The heat dissipation device also includes a second gear (194), a guard plate (195), a connecting rod (196), and a second rack (197). The second gear (194) is fixedly installed on the circumferential surface of the rotating rod (192). The guard plate (195) is rotatably installed on the top of the inner wall of the outer casing (7). The second rack (197) is slidably installed on the bottom of the second motor (191). One end of the connecting rod (196) is slidably installed on the front of the guard plate (195), and the other end of the connecting rod (196) is fixedly installed on the front of the second rack (197).

6. A floor grinding machine capable of avoiding height differences according to claim 5, characterized in that: The gear two (194) meshes with the rack two (197), and a spring three is provided between the guard plate (195) and the top of the inner wall of the outer shell (7).

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