Scrap metal surface polishing device

Abstract

The invention discloses a scrap metal surface grinding device, and relates to the field of metal grinding, the scrap metal surface grinding device comprises a grinding base and a grinding mechanism, the grinding mechanism is arranged above the grinding base, a rectangular grinding groove is formed in the top surface of the grinding base, a mounting cavity is formed in the grinding base, the rectangular grinding groove communicates with the mounting cavity, and the rectangular grinding groove communicates with the mounting cavity; the rectangular grinding groove is located in the inner ring of the mounting cavity, a grinding base plate is rotationally arranged in the mounting cavity and makes contact with a step formed by the mounting cavity and the rectangular grinding groove, the grinding mechanism comprises a lifting cross beam and a grinding top plate, and the grinding top plate is rotationally mounted on the lifting cross beam; the lifting cross beam has the freedom degree of moving in the height direction of the grinding base, the rotating direction of the grinding top disc is opposite to the rotating direction of the grinding bottom disc, the double faces of a plurality of metal pieces can be ground at the same time, the grinding efficiency is greatly improved, the grinding period is greatly shortened, and the grinding device is suitable for batch grinding operation.

Description

Technical Field

[0001] This invention relates to the field of metal polishing technology, specifically to a surface polishing device for scrap metal. Background Technology

[0002] With the large-scale development of the scrap metal recycling industry, scrap metal surface grinding, as a core process in recycling, directly impacts the adaptability to subsequent processing and the benefits of resource recovery through its operational efficiency and processing quality. Impurities such as rust, scale, and burrs on the surface of scrap metal must be thoroughly removed to meet the requirements of subsequent processes such as welding and reshaping. However, existing scrap metal surface grinding equipment faces significant technical bottlenecks in batch processing scenarios. The core issue lies in the limitations of the grinding method, hindering the improvement of operational efficiency. Firstly, it can only process single metal parts at a time, lacking batch processing capacity: Traditional grinding equipment often adopts a single-station design, relying on manual labor or simple machinery to load, position, and grind each piece individually. After completing one piece, the machine must be stopped to unload before the next piece is clamped, resulting in long loading and unloading intervals and making it impossible to simultaneously grind multiple metal parts. For batch-recycled scrap metal, this piece-by-piece processing mode leads to extremely low processing volume per unit time, severely restricting the efficiency of large-scale recycling and failing to meet the batch operation needs of industrial production. Secondly, existing equipment generally adopts a single-sided grinding structure, which can only grind a single surface of the metal part. To achieve thorough grinding on both sides, a special flipping mechanism is required (such as a robotic arm or manual flipping). After grinding one side, the machine must be stopped to remove the metal part for flipping, or the workstation must be changed via the flipping mechanism before grinding the other side. The additional flipping process not only increases the equipment investment cost but also extends the total processing time for a single metal part. Furthermore, positioning deviations of the metal part are prone to occur during the flipping process, resulting in inconsistent grinding accuracy on both sides.

[0003] In summary, the combination of piece-by-piece processing and single-sided grinding results in a significant amount of ineffective downtime in the workflow (loading, flipping, unloading), leading to a longer grinding cycle for metal parts, lower efficiency, and making it unsuitable for batch processing. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a surface grinding device for scrap metal to solve the shortcomings of the prior art.

[0005] The objective of this invention is achieved through the following technical solution: a surface grinding device for scrap metal, comprising a grinding base and a grinding mechanism, wherein the grinding mechanism is disposed above the grinding base, a rectangular grinding groove is formed on the top surface of the grinding base, an installation cavity is formed inside the grinding base, the rectangular grinding groove communicates with the installation cavity, and the rectangular grinding groove is located in the inner circle of the installation cavity, a grinding plate is rotatably disposed inside the installation cavity, the grinding plate contacts the step formed by the installation cavity and the rectangular grinding groove, and the grinding mechanism comprises a lifting beam and a grinding top plate. The grinding top plate is rotatably mounted on the lifting beam, which has the freedom to move along the height direction of the grinding base. The rotation direction of the grinding top plate is opposite to that of the grinding base. The grinding base has dust removal chambers on both sides of the rectangular grinding groove. Several dust removal holes are opened on the side wall of the rectangular grinding groove near the dust removal chamber. The dust removal holes are connected to the dust removal chamber. The grinding base is equipped with a vacuum pump and an air blowing device. The vacuum pump is connected to the dust removal chamber through a negative pressure pipe, and the air blowing device is connected to the dust removal chamber through a gas pipe.

[0006] Furthermore, the dust removal hole is inclined, and the bottom end of the dust removal hole is connected to a rectangular grinding groove.

[0007] Furthermore, the grinding mechanism also includes a mounting base, a cylinder, and a motor. A support plate is fixed on the mounting base, and a slide rail is fixed on the support plate. A slide rail slider is slidably fitted on the slide rail. The lifting beam is fixed on the slide rail slider. The cylinder is vertically mounted on the mounting base, and the telescopic shaft of the cylinder is connected to the lifting beam. A grinding spindle is coaxially fixed to the top of the grinding top plate. A linear bearing is mounted on the grinding spindle. The support bearing is rotatably mounted on the lifting beam via a ball bearing. The motor is mounted on the lifting beam, and the output shaft of the motor is connected to a drive pulley. The grinding spindle is connected to a driven pulley, and the driven pulley is connected to the drive pulley via a synchronous belt drive.

[0008] Furthermore, the lifting beam is provided with a detection cavity, the grinding spindle passes through the detection cavity, a pressure sensor is installed in the detection cavity, a pressure bearing is provided in the detection cavity, the inner ring of the pressure bearing is fixed on the grinding spindle, a pressure ring is fixed on the outer ring of the pressure bearing, the bottom surface of the pressure ring contacts the inner bottom wall of the detection cavity, and the top surface of the pressure ring contacts the pressure shaft of the pressure sensor.

[0009] Furthermore, a distance sensor is installed on the bottom surface of the lifting beam, a grinding detection plate is fixed on the side wall of the grinding base, and the signal receiver configured with the distance sensor is installed on the grinding detection plate.

[0010] Furthermore, the top surface of the grinding base is coaxially marked with a positioning circle, and the metal part to be ground is placed inside the positioning circle of the grinding base. The bottom of the grinding top plate is coaxially fixed with a limiting ring, and the axial length of the limiting ring is less than the thickness of the metal part after grinding.

[0011] Furthermore, a flange is fixedly fitted on the top surface of the limiting ring, and the flange is connected to the grinding top plate by a screw.

[0012] Furthermore, the grinding base has a dust discharge hole at the bottom of the dust removal chamber. The size of the dust removal chamber gradually decreases from top to bottom. One end of the dust discharge hole is connected to the smaller end of the dust removal chamber, and the other end passes through the bottom of the grinding base. The grinding base has a plug mounting hole on one side of the dust discharge hole. The plug mounting hole is perpendicular to the dust discharge hole and communicates with it. A plug is slidably installed in the plug mounting hole. One end of the plug passes through the dust discharge hole and is used to seal the dust discharge hole.

[0013] Furthermore, an electromagnet is installed in the plug mounting hole, and a permanent magnet is fixed to one end of the plug near the electromagnet. When the electromagnet is energized, it generates magnetic poles that are opposite to the magnetic properties of the permanent magnet. A spring is installed in the plug mounting hole, and the two ends of the spring are respectively connected to the plug and the grinding base.

[0014] Furthermore, a main shaft is coaxially fixed to the bottom of the grinding chassis, a drive motor is installed in the mounting cavity, the output shaft of the drive motor is connected to a first gear, and a second gear is fitted on the main shaft, with the second gear meshing with the first gear.

[0015] The beneficial effects of this invention are: 1. With the dual-disc opposing design of "grinding top disc + grinding bottom disc", the upper and lower surfaces can be ground simultaneously without the need for an additional flipping mechanism. This completely eliminates the flipping process and downtime required for traditional single-sided grinding. Furthermore, multiple metal parts can be placed between the grinding top disc and the grinding bottom disc, allowing for simultaneous grinding of both sides of multiple metal parts. This greatly improves grinding efficiency and significantly shortens the grinding cycle, making it suitable for batch grinding operations.

[0016] 2. The metal parts are pressed between the grinding top plate and the grinding bottom plate for grinding. The grinding top plate and the grinding bottom plate rotate in opposite directions, so that the rotational torque on the metal parts can cancel each other out. This prevents the metal parts from rotating during the grinding process, eliminating the need for additional clamping for each metal part. Both sides of the metal parts are fully exposed, and the installation space for clamping mechanisms is saved, allowing more metal parts to be ground at the same time. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of a surface grinding device for scrap metal according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a surface grinding device for scrap metal according to the present invention. Figure 2 ; Figure 3 This is a top view of a surface polishing device for scrap metal according to the present invention; Figure 4 for Figure 3 Sectional view along line AA; Figure 5 for Figure 4 Enlarged view at point B in the middle; Figure 6 for Figure 4 Enlarged view at point C; In the diagram, 1-grinding base, 2-rectangular grinding groove, 3-grinding chassis, 4-lifting crossbeam, 5-grinding top plate, 6-mounting cavity, 7-dust removal cavity, 8-dust removal hole, 9-mounting base, 10-cylinder, 11-motor, 12-support plate, 13-slide rail, 14-slide rail slider, 15-grinding spindle, 16-linear bearing, 17-ball bearing, 18-drive pulley, 19-driven pulley, 20-synchronous belt, 21-detection. Cavity, 22-Pressure sensor, 23-Pressure bearing, 24-Pressure ring, 25-Distance sensor, 26-Grinding detection plate, 27-Limit ring, 28-Flange, 29-Screw, 30-Dust vent, 31-Plug mounting hole, 32-Plug, 33-Electromagnet, 34-Permanent magnet, 35-Spring, 36-Main shaft, 37-Drive motor, 38-First gear, 39-Second gear, 40-Shielding plate, 42-Support spring. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0019] Example 1 like Figures 1 to 6As shown, a surface grinding device for scrap metal includes a grinding base 1 and a grinding mechanism. The grinding mechanism is positioned above the grinding base 1. A rectangular grinding groove 2 is formed on the top surface of the grinding base 1. An installation cavity 6 is formed inside the grinding base 1. The rectangular grinding groove 2 communicates with the installation cavity 6 and is located within the inner circle of the installation cavity 6. A grinding plate 3 is rotatably mounted inside the installation cavity 6, and the grinding plate 3 contacts the step formed by the installation cavity 6 and the rectangular grinding groove 2. The grinding mechanism includes a lifting beam 4 and a grinding top plate 5. The grinding top plate 5 is rotatably mounted on the lifting beam 4. The lifting beam 4 has the freedom to move along the height direction of the grinding base 1. The rotation direction of the grinding top plate 5 is opposite to the rotation direction of the grinding plate 3. Dust removal cavities 7 are formed on both sides of the rectangular grinding groove 2 in the grinding base 1. Several dust removal holes 8 are provided on the side wall of the groove 2 near the dust removal chamber 7. The dust removal holes 8 are connected to the dust removal chamber 7. The grinding base 1 is equipped with a vacuum pump and an air blowing device. The vacuum pump is connected to the dust removal chamber 7 through a negative pressure pipe, and the air blowing device is connected to the dust removal chamber 7 through a gas pipe. Place the same metal parts or metal parts with the same thickness after grinding on the grinding base 3. After the grinding base 3 is filled, the lifting beam 4 drives the grinding top plate 5 to move downward, so that the grinding top plate 5 moves into the rectangular grinding groove 2, thereby squeezing the metal parts between the grinding top plate 5 and the grinding base 3. The metal parts are ground on both sides by the rotation of the grinding top plate 5 and the grinding base 3. Multiple metal parts can be ground on both sides at the same time, which greatly improves the grinding efficiency and shortens the grinding cycle to a great extent. It is suitable for batch grinding operations. During the grinding process, the grinding top plate 5 and the grinding base plate 3 rotate in opposite directions, so that the rotational torque on the metal parts can cancel each other out. This prevents the metal parts from rotating during the grinding process, eliminating the need for additional clamping of each metal part. This leaves both sides of the metal parts fully exposed, saves installation space for the clamping mechanism, and allows for grinding of more metal parts simultaneously. After grinding, the lifting beam 4 moves the grinding top plate 5 upwards, then the metal parts are removed. Next, the grinding base plate 3 is cleaned. Solenoid valves are installed on both the negative pressure pipe and the gas pipe. One of the two dust collection chambers 7 blows air, and the other draws air. The blowing device blows air from one set of dust collection holes 8, thus blowing dust from the grinding base plate 3 towards the other set of dust collection holes 8. The vacuum pump then draws in dust from the other set of dust collection holes 8. The two dust collection chambers 7 then reverse their operation, meaning one set of dust collection holes 8 draws in dust while the other set blows air, effectively removing a large amount of dust from the grinding base plate 3. Simultaneously, the rectangular grinding groove 2 has a rectangular cross-section, ensuring that both the blowing and drawing paths are linear, effectively blowing dust towards the drawing area and improving dust removal efficiency. In practice, the blowing device uses a high-pressure air compressor, an air ring blower, etc.

[0020] Furthermore, a main shaft 36 is coaxially fixed to the bottom of the grinding chassis 3, and a drive motor 37 is installed in the mounting cavity 6. The output shaft of the drive motor 37 is connected to a first gear 38, and a second gear 39 is mounted on the main shaft 36. The second gear 39 meshes with the first gear 38. The motor 37 drives the main shaft 36 to rotate through the meshing of the first gear 38 and the second gear 39. The main shaft 36 drives the grinding chassis 3 to rotate, thus completing the grinding of the bottom surface of the metal part.

[0021] Furthermore, the dust removal hole 8 is set at an angle, and the bottom end of the dust removal hole 8 is connected to the rectangular grinding groove 2. The angled setting of the dust removal hole 8 allows the high-pressure gas to act on the grinding chassis 3, which diffuses the air and has a large blowing area, enabling full-coverage blowing dust removal. After the dust removal hole 8 is set at an angle, a blowing blind zone is easily formed below the dust removal hole 8. Therefore, the two sets of dust removal holes 8 alternately perform blowing and suction actions to complete the dust removal of the blowing blind zone.

[0022] Example 2 Based on Example 1, such as Figures 1 to 3 As shown, a baffle plate 40 is slidably fitted onto the grinding top plate 5. The diameter of the baffle plate 40 is larger than the length of the rectangular grinding groove 2, preventing the baffle plate 40 from entering the rectangular grinding groove 2. The top of the baffle plate 40 is connected to the lifting beam 4 via a support spring 42. The two ends of the support spring 42 are respectively connected to the baffle plate 40 and the lifting beam 4. Due to the need to form a linear airflow path, the rectangular grinding groove 2 is set as a rectangle, while the grinding top plate 5 is circular, resulting in a certain space between the grinding top plate 5 and the rectangular grinding groove 2. This prevents the grinding top plate 5 from blocking the rectangular grinding groove 2. When dust removal is performed, even if the grinding top plate... 5. The grinding plate 5 moves into the rectangular grinding groove 2 to prevent dust from overflowing. However, dust will still overflow through the gap between the grinding plate 5 and the rectangular grinding groove 2, causing environmental pollution. Therefore, a shielding plate 40 is configured. After the polished metal part is taken out, the lifting beam 4 drives the grinding plate 5 and the shielding plate 40 to move downward. The shielding plate 40 contacts the top surface of the grinding base 1, and the grinding plate 5 moves into the rectangular grinding groove 2. The bottom surfaces of the grinding plate 5 and the rectangular grinding groove 2 have a certain amount of room to move. At this time, the grinding plate 5 and the shielding plate 40 work together to shield the rectangular grinding groove 2 to prevent dust from overflowing during dust removal.

[0023] Example 3 Dust is removed by a vacuum pump, such as Figures 1 to 5As shown, the dust removal chamber 7 is designed so that some dust will remain inside it. When switching working states for blowing, the dust in the dust removal chamber 7 will be blown back into the rectangular grinding groove 2. Therefore, based on embodiment two, the grinding base 1 has a dust discharge hole 30 at the bottom of the dust removal chamber 7. The size of the dust removal chamber 7 gradually decreases from top to bottom. One end of the dust discharge hole 30 is connected to the smaller end of the dust removal chamber 7, and the other end passes through the bottom of the grinding base 1. The grinding base 1 has a plug mounting hole 31 on one side of the dust discharge hole 30. The plug mounting hole 31 is perpendicular to the dust discharge hole 30 and communicates with the plug mounting hole 31. A plug 32 is slidably installed in the plug mounting hole 31. One end of the plug 32 passes through the dust discharge hole 30 and is used to seal the dust discharge hole 30. An electromagnet 33 is installed in the plug mounting hole 31. A permanent magnet 34 is fixed to the end of the plug 32 near the electromagnet 33. The electromagnet 33 is connected to the plug mounting hole 31. An electric current generates a magnetic pole opposite to that of the permanent magnet 34. A spring 35 is installed in the plug mounting hole 31, with the two ends of the spring 35 connected to the plug 32 and the grinding base 1, respectively. When the negative pressure dust collection ends, the dust remaining in the dust collection chamber 7 falls into the dust discharge hole 30, preventing the dust in the dust collection chamber 7 from being carried into the rectangular grinding groove 2 during dust blowing. After a period of time, the electromagnet 33 is energized to attract the permanent magnet 34, causing the plug 32 to move into the plug mounting hole 31, opening the bottom of the dust discharge hole 30. A dust collection box is set at the bottom of the dust discharge hole 30, allowing the dust in the dust discharge hole 30 to fall into the dust collection box. After the dust discharge is completed, the electromagnet 33 is de-energized, causing the plug 32 to reset under the action of the spring 35, thus re-blocking the dust discharge hole 30. This does not affect the negative pressure state in the dust collection chamber 7, ensuring that the negative pressure dust collection is unaffected, and also preventing the retained dust from being carried back into the rectangular grinding groove 2.

[0024] Example 4 Based on Example 3, such as Figures 1 to 6As shown, the grinding mechanism also includes a mounting base 9, a cylinder 10, and a motor 11. A support plate 12 is fixed on the mounting base 9, and a slide rail 13 is fixed on the support plate 12. A slide rail slider 14 is slidably fitted on the slide rail 13. The lifting beam 4 is fixed on the slide rail slider 14. The cylinder 10 is vertically mounted on the mounting base 9, and the telescopic shaft of the cylinder 10 is connected to the lifting beam 4. A grinding spindle 15 is coaxially fixed to the top of the grinding top plate 5. A linear bearing 16 is mounted on the grinding spindle 15, and the support bearing 16 is rotatably mounted on the lifting beam through a ball bearing 17. 4. The motor 11 is mounted on the lifting beam 4. The output shaft of the motor 11 is connected to the drive pulley 18. The grinding spindle 15 is connected to the driven pulley 19. The driven pulley 19 is connected to the drive pulley 18 through the synchronous belt 20. The lifting beam 4 moves up and down through the extension and retraction of the cylinder 10. The motor 11 drives the drive pulley 18 to rotate. The drive pulley 18 drives the driven pulley 19 to rotate through the synchronous belt 20. The driven pulley 19 drives the grinding top plate 5 to rotate through the grinding spindle 15. In conjunction with the rotation of the grinding base plate 3, the double-sided grinding of the metal parts is completed.

[0025] Example 5 Based on Example 4, such as Figures 1 to 6 As shown, the lifting beam 4 has a detection chamber 21. The grinding spindle 15 passes through the detection chamber 21. A pressure sensor 22 is installed inside the detection chamber 21. A pressure bearing 23 is also installed inside the detection chamber 21. The inner ring of the pressure bearing 23 is fixed to the grinding spindle 15, and a pressure ring 24 is fixed to the outer ring of the pressure bearing 23. The bottom surface of the pressure ring 24 contacts the inner bottom wall of the detection chamber 21, and the top surface of the pressure ring 24 contacts the pressure shaft of the pressure sensor 22. Through the arrangement of the linear bearing 16, the grinding top plate 5 has a tendency to move in the vertical direction, so that the pressure energy exerted by the grinding top plate 5 on the metal part can be increased. The pressure ring 24 acts on the pressure shaft of the pressure sensor 22, thereby controlling the grinding pressure. The ball bearing 17 allows the linear bearing 16 and the grinding spindle 15 to rotate together on the lifting beam 4, so that the lifting beam 4 can rotate while transmitting pressure to the pressure sensor 22. The pressure bearing 23 allows the pressure ring 24 and the grinding spindle 15 to rotate relative to each other, so that the grinding spindle 15 transmits pressure to the pressure sensor 22 through the pressure ring 24. The pressure ring 24 does not rotate with the pressure sensor 22 and will not wear the pressure shaft of the pressure sensor 22.

[0026] Example 6 Based on Embodiment 5, a distance sensor 25 is installed on the bottom surface of the lifting beam 4, and a grinding detection plate 26 is fixed on the side wall of the grinding base 1. The signal receiver configured on the distance sensor 25 is installed on the grinding detection plate 26. The grinding accuracy of the metal parts can be precisely controlled by the distance sensor 25. Specifically, the lifting beam 4 first drives the grinding top plate 5 to move downward. The pressure signal fed back by the pressure sensor 22 can determine whether the grinding top plate 5 is in contact with the metal parts. When the grinding top plate 5 contacts the metal parts, the distance sensor 25 measures the base distance and then performs the grinding operation. The distance sensor 25 detects the change in distance, and the change in distance is the grinding thickness, thereby achieving precise control of the grinding thickness.

[0027] Example 7 Based on Example 6, such as Figure 1 and Figure 2 As shown, a positioning circle is coaxially marked on the top surface of the grinding base 3. The metal part to be ground is placed inside the positioning circle of the grinding base 3. A limiting ring 27 is coaxially fixed to the bottom of the grinding top plate 5. The axial length of the limiting ring 27 is less than the thickness of the metal part after grinding. A flange 28 is fixedly fitted on the top surface of the limiting ring 27. The flange 28 is connected to the grinding top plate 5 by a screw 29. Since there is a gap between the grinding top plate 5 and the rectangular grinding groove 2, if the metal part is placed in the gap, it will result in incomplete grinding of the metal part. Therefore, a positioning circle is marked on the grinding base 3. The area inside the positioning circle is the grinding coverage area of ​​the grinding top plate 5. The metal part is placed in the positioning circle. The limiting ring 27 is positioned within the grinding area of ​​the grinding top plate 5. When the grinding top plate 5 contacts the metal part for grinding, the metal part is located within the limiting ring 27, thereby limiting the metal part and ensuring that the metal part is always within the grinding coverage area of ​​the grinding top plate 5 during the grinding process, achieving double-sided full grinding of the metal part. Secondly, the limiting ring 27 is detachably installed on the grinding top plate 5, and the limiting ring 27 can be replaced according to the metal part of different thicknesses. The axial length of the limiting ring 27 is less than the thickness of the metal part after grinding, ensuring that the limiting ring 27 will not contact the grinding base plate 3 during the grinding process, and that the limiting ring 27 can successfully limit the metal part.

Claims

1. A surface dressing device for scrap metal, characterised in that, The utility model relates to a polishing base (1) and polishing mechanism, polishing mechanism sets up in the top of polishing base (1), the top of polishing base (1) is opened with rectangular polishing groove (2), the inside of polishing base (1) is opened with installation cavity (6), rectangular polishing groove (2) is connected installation cavity (6), and rectangular polishing groove (2) is located the inside ring of installation cavity (6), the installation cavity (6) is rotationally arranged with polishing base (3), and polishing base (3) contacts the step formed by installation cavity (6) and rectangular polishing groove (2) on, the polishing mechanism includes lifting beam (4) and polishing top tray (5), polishing top tray (5) rotationally installs on lifting beam (4), lifting beam (4) has the freedom of moving along the height direction of polishing base (1), the rotating direction of polishing top tray (5) is opposite with the rotating direction of polishing base (3), the both sides of polishing base (1) are opened with dust removal cavity (7) in rectangular polishing groove (2), the side wall of rectangular polishing groove (2) is opened with a plurality of dust removal holes (8) close to dust removal cavity (7), dust removal hole (8) is communicated with dust removal cavity (7), polishing base (1) is equipped with vacuum pump and blowing equipment, vacuum pump is communicated dust removal cavity (7) through negative pressure pipeline, blowing equipment is communicated dust removal cavity (7) through gas pipeline.

2. A device for surface finishing of scrap metal as claimed in claim 1 wherein, Dust removal hole (8) is obliquely arranged, and the bottom end of dust removal hole (8) is communicated with rectangular polishing groove (2).

3. The apparatus of claim 1, wherein: The polishing mechanism further includes an installation base (9), a cylinder (10), and a motor (11). The installation base (9) is fixed with a support plate (12). The support plate (12) is provided with a sliding rail (13). The sliding rail (13) is slidably connected with a sliding rail slider (14). The lifting beam (4) is fixed on the sliding rail slider (14). The cylinder (10) is vertically installed on the installation base (9). The extension shaft of the cylinder (10) is connected with the lifting beam (4). The top of the polishing top tray (5) is coaxially fixed with a polishing main shaft (15). The polishing main shaft (15) is assembled with a linear bearing (16). The support bearing (16) is rotationally installed on the lifting beam (4) through a ball bearing (17). The motor (11) is installed on the lifting beam (4). The output shaft of the motor (11) is connected with a driving pulley (18). The polishing main shaft (15) is connected with a driven pulley (19). The driven pulley (19) is drivingly connected with the driving pulley (18) through a synchronous belt (20).

4. A device for surface finishing of scrap metal as claimed in claim 3 wherein, The lifting crossbeam (4) is internally provided with a detection cavity (21), the polishing spindle (15) passes through the detection cavity (21), a pressure sensor (22) is installed in the detection cavity (21), a pressure bearing (23) is arranged in the detection cavity (21), the inner ring of the pressure bearing (23) is fixed on the polishing spindle (15), the outer ring of the pressure bearing (23) is fixed with a pressure ring (24), the bottom surface of the pressure ring (24) contacts the inner bottom wall of the detection cavity (21), and the top surface of the pressure ring (24) contacts the pressure shaft of the pressure sensor (22).

5. The apparatus for surface finishing of scrap metal as defined in claim 1 wherein, The bottom surface of the lifting crossbeam (4) is provided with a distance sensor (25), and the side wall of the polishing base (1) is fixed with a polishing detection plate (26); and the signal receiver of the distance sensor (25) is installed on the polishing detection plate (26).

6. The apparatus of claim 1, wherein, The top surface of the polishing bottom disc (3) is coaxially marked with a positioning circle, the metal part to be polished is placed in the positioning circle of the polishing bottom disc (3), the bottom of the polishing top disc (5) is coaxially fixed with a limiting ring (27), and the axial length of the limiting ring (27) is smaller than the thickness of the metal part after polishing.

7. A device for surface finishing of scrap metal as claimed in claim 6 wherein, The top surface of the limiting ring (27) is fixedly sleeved with a flange plate (28), and the flange plate (28) is connected to the polishing top disc (5) through a screw rod (29).

8. The apparatus of claim 1, wherein: The polishing base (1) is provided with a dust discharge hole (30) at the bottom of the dust removal cavity (7), the size of the dust removal cavity (7) gradually decreases from top to bottom, one end of the dust discharge hole (30) is communicated with the small size end of the dust removal cavity (7), the other end passes through the bottom of the polishing base (1), the polishing base (1) is provided with a plug mounting hole (31) on one side of the dust discharge hole (30), the plug mounting hole (31) is perpendicular to the dust discharge hole (30), the dust discharge hole (30) is communicated with the plug mounting hole (31), and the plug mounting hole (31) is slidably provided with a plug (32), one end of the plug (32) passes through the dust discharge hole (30) and is used for plugging the dust discharge hole (30).

9. A device for surface finishing of scrap metal as claimed in claim 8 wherein, An electromagnet (33) is installed in the plug mounting hole (31), a permanent magnet (34) is fixed to one end of the plug (32) close to the electromagnet (33), the electromagnet (33) is electrified to generate a magnetic pole different from that of the permanent magnet (34), a spring (35) is installed in the plug mounting hole (31), and the two ends of the spring (35) are connected with the plug (32) and the polishing base (1) respectively.

10. The apparatus of claim 1, wherein, The bottom of the polishing bottom disc (3) is coaxially fixed with a main shaft (36), a driving motor (37) is installed in the mounting cavity (6), the output shaft of the driving motor (37) is connected with a first gear (38), a second gear (39) is sleeved on the main shaft (36), and the second gear (39) is engaged with the first gear (38).

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