A flat continuous polishing system for sheet metal

Abstract

This invention discloses a continuous polishing system for flat metal sheets, belonging to the technical field of metal sheet processing equipment. It includes a conveyor belt arranged at intervals, a grinding section, and a blowing section and a dust extraction assembly located on both sides of the grinding section. The blowing section includes upper and lower air pipes and a conveyor roller rotating around them. The strip-shaped opening of the upper air pipe is angled upwards towards the edge of the upper grinding wheel, while the strip-shaped opening of the lower air pipe is angled downwards towards the edges of the adjacent conveyor belt and the lower grinding wheel, respectively. The first dust extraction section and the second dust extraction port of the dust extraction assembly are both directed towards the cutting contact area between the grinding wheel and the metal sheet. This invention, through the specific combination of oblique directional blowing and precise suction in the contact area, avoids the obstruction and diversion caused by direct airflow and dust dispersion, prevents secondary dust adhesion that could damage the bottom layer of the sheet, and improves the dust collection efficiency and sheet processing cleanliness of the system.

Description

Technical Field

[0001] This invention relates to the field of metal sheet processing equipment technology, and in particular to a continuous polishing system for flat metal sheets. Background Technology

[0002] In the processing and manufacturing of metal sheets, it is usually necessary to continuously polish and deburr the surface and edges to improve the surface finish of the sheet and meet the requirements of subsequent coating or assembly processes.

[0003] To improve processing efficiency and achieve simultaneous dust removal, surface polishing equipment commonly employs multiple sets of grinding rollers combined with a blowing and suction dust removal system. A double-sided high-efficiency fully automatic polishing dust removal device, as described in announcement number CN121821172B, includes a frame, a conveying mechanism, multiple sets of grinding wheels, and a dust removal mechanism. This dust removal mechanism mainly consists of a vertical dust suction hood located at the top of the frame and an internal air pipe positioned between the two sets of grinding wheels. The internal air pipe has horizontally oriented strip-shaped air inlets facing the grinding wheels and the workpiece, collecting waste residue through a combination of blowing and suction.

[0004] The waste collection solution relying on a top dust hood and horizontal air blowing pipe has shortcomings. In actual continuous processing, to ensure cutting effect, adjacent grinding wheels usually rotate in opposite directions. This causes metal dust, when detached from the sheet metal, to be locally concentrated or dispersed at high speed along a specific tangential direction due to the combined effects of rotational centrifugal force and tangential cutting force. In the existing solution, a triangular distribution of air jet nozzles is designed on the air pipe, with the jets directed towards adjacent grinding wheels, the surface of the metal sheet, and adjacent conveyor rollers. Specifically, the fixed airflow blown towards the grinding wheel is diverted to both sides upon contact with the grinding wheel surface due to the surface contour; this diverted airflow carries away residual metal dust from the grinding wheel, causing localized dust dispersion. Especially in the workstations where the bottom surface of metal sheets is being polished, this dispersion can cause dust to re-adhere to the bottom surface of the metal sheet and re-enter the polishing wheel's processing process, causing damage to the bottom surface of the metal sheet. This reduces the actual collection efficiency of the dust removal mechanism and the cleanliness of the sheet surface.

[0005] Therefore, it is necessary to improve the slag removal and dust collection structure of the continuous polishing system for flat metal sheets to solve the problem that the existing static external dust suction hood and horizontal air blowing structure are unable to effectively collect the dust that is thrown at high speed along the tangent by the rotational force during cutting. Summary of the Invention

[0006] The present invention provides a continuous polishing system for metal sheets, which aims to solve the problem that existing dust removal solutions cause dust to escape and re-adhere to the bottom surface of the sheet due to airflow interference, thereby causing damage to the sheet surface and low collection efficiency.

[0007] The present invention employs the following technical solution: a continuous polishing system for a flat metal sheet. It includes two sets of conveyor belts, spaced apart, suitable for conveying metal sheets; Two grinding sections are set between two sets of conveyor belts, and each grinding section includes upper and lower grinding wheels. The blowing section and the dust extraction section are located on both sides of the two sets of polishing sections; The purging section includes an upper air pipe and a lower air pipe, as well as conveying rollers that are respectively sleeved on the outside of the corresponding air pipes and rotate; the air pipes have strip-shaped openings, and the conveying rollers have several ventilation holes. The upper air blowing pipe has a strip-shaped opening that faces upwards toward the edge of the corresponding upper grinding wheel; The lower air blowing pipe has two downward-sloping strip-shaped openings, which are respectively inclined downward toward the adjacent conveyor belt edge and the corresponding grinding wheel edge below. The dust extraction assembly includes a first dust extraction section and a second suction pipe; the first dust extraction section is disposed between the blowing section and the adjacent polishing section; the second suction pipe is disposed between two sets of parallel polishing sections and has two second suction ports. Both the first dust extraction section and the second dust suction port are oriented towards the cutting contact area between the grinding wheel and the metal sheet, which is suitable for cooperating with the blowing section to extract dust.

[0008] Furthermore, the ends of the upper and lower air-blowing pipes located on the same side are connected by a Y-shaped air pipe, which has an air inlet suitable for connection with an external air supply device.

[0009] Furthermore, the first dust extraction unit includes a first suction pipe located above and below the metal sheet conveying path, the first suction pipe being parallel to the upper air blowing pipe and the lower air blowing pipe, and the first suction pipe having a long strip-shaped first dust suction port.

[0010] Furthermore, there are two second exhaust pipes, which are respectively distributed above and below the metal sheet conveying path, and the ends of the first exhaust pipe and the second exhaust pipe are respectively connected to the first air inlet pipe and the second air inlet pipe.

[0011] Furthermore, the conveying roller is adapted to achieve synchronous transmission connection with the end conveying roller of the adjacent conveyor belt via a transmission assembly.

[0012] Furthermore, the grinding wheels of the two sets of side-by-side grinding sections are arranged with opposite cutting directions.

[0013] Furthermore, it also includes racks; The two sets of conveyor belts are a feeding conveyor belt and a discharging conveyor belt, respectively, and are set at both ends of the frame; Two symmetrically arranged mounting frames are horizontally connected between the frame containing the infeed conveyor belt and the discharge conveyor belt. The two ends of the grinding wheels of the two sets of grinding sections are mounted on the mounting frame via bearing seats.

[0014] Furthermore, it also includes two drive motors symmetrically arranged inside the frame; The two drive motors are respectively connected to the grinding wheels below the two sets of grinding sections through a first pulley unit; the grinding wheels arranged above and below each other in the same group are connected to each other through a second pulley unit.

[0015] Furthermore, it also includes a dust collection mechanism, which includes a top dust collection hood located at the top of the inner wall of the frame to cover the grinding area, and a bottom dust collection hood located at the bottom of the inner wall of the frame, with a main exhaust pipe connecting the top dust collection hood and the bottom dust collection hood.

[0016] Furthermore, both the first air inlet pipe and the second air inlet pipe are connected to the main exhaust pipe, and an external pipe suitable for connecting to an external negative pressure device is connected to the main exhaust pipe.

[0017] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: This invention discloses a continuous polishing system for metal sheets. By setting up a blowing section with specific guidance on both sides of the grinding section and cooperating with a positioned dust extraction component, this invention effectively overcomes the problems in the prior art where the airflow is directly facing the grinding wheel, causing dust to escape with the split airflow and secondary adhesion of dust on the bottom surface.

[0018] Specifically, the blowing unit performs directional blowing through the upper and lower air pipes of the externally mounted rotating conveyor roller. The upper air pipe has a strip-shaped opening that slopes upward toward the edge of the grinding wheel, while the lower air pipe has two strip-shaped openings that slope downward toward the edge of the conveyor belt and the edge of the grinding wheel, respectively. This design, which slopes downward toward the edge of the grinding wheel, changes the original direct blowing method, avoiding the airflow from directly contacting the surface contour of the grinding wheel and causing obstruction and diversion. It also suppresses the local airflow from carrying away dust and effectively blocks the secondary adhesion path of dust to the bottom surface of the metal sheet, preventing the bottom dust from re-entering the grinding process and causing damage to the sheet.

[0019] Simultaneously, the first dust extraction unit, located between the blowing section and the adjacent grinding section, and the second air extraction pipe, located between the two grinding sections, ensure that both the first dust extraction unit and the second dust extraction port are directly and precisely oriented towards the cutting contact area between the grinding wheel and the metal sheet. This structure conforms to the high-speed projection direction of dust under the action of centrifugal force and tangential cutting force, forming a coordinated dust removal flow field of directional oblique blowing and contact area suction, thereby effectively improving the overall dust collection efficiency of the system and the processing cleanliness of the sheet surface. Attached Figure Description

[0020] The accompanying drawings, which are provided to further illustrate the invention and form part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0021] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the continuous planar polishing system for metal sheets in this application; Figure 2 For the present invention Figure 1 A schematic diagram of a partial structure; Figure 3 For the present invention Figure 2 A schematic diagram of a partial structure; Figure 4 For the present invention Figure 2 Schematic diagram of the grinding mechanism and dust collection mechanism; Figure 5 For the present invention Figure 2 A schematic diagram of the laser cutting assembly and chamfering mechanism in their default state; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 For the present invention Figure 2 A schematic diagram of the laser cutting assembly and chamfering mechanism in operation. Figure 8 This is a partial structural diagram of the dust blowing assembly of the present invention.

[0022] Figure label: 1. Frame; 2. Feed conveyor belt; 3. Discharge conveyor belt; 4. Grinding mechanism; 41. Mounting frame; 42. Bearing seat; 43. Grinding wheel; 44. Drive motor; 45. First pulley unit; 46. Second pulley unit; 5. Dust blowing assembly; 51. Support base; 52. Air blowing pipe; 521. Strip-shaped inlet; 53. Conveying roller; 531. Vent hole; 54. Y-shaped air pipe; 541. Air inlet interface; 55. First exhaust pipe; 551. First dust suction port; 552. First air inlet pipe; 56. Second exhaust pipe; 561. Second dust suction port; 562. Second air inlet pipe; 6. Dust suction mechanism; 61. Top dust suction hood; 62. Bottom dust suction hood; 63. Main exhaust pipe; 64. External pipe. Detailed Implementation

[0023] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0024] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Example 1: This example mainly introduces the basic structure of a continuous polishing system for flat metal sheets and the working principle of grinding and dust removal. Specifically: like Figures 1-3 As shown, this application provides a continuous polishing system for a flat metal sheet, including a frame 1, and a feeding conveyor belt 2 and a discharging conveyor belt 3 disposed at both ends of the frame 1. The metal sheet is first smoothly fed into the frame 1 via the feeding conveyor belt 2 for processing, and then removed via the discharging conveyor belt 3 after processing.

[0026] To achieve simultaneous and continuous grinding of the upper and lower surfaces of the metal sheet, such as Figures 3-5 As shown, a grinding mechanism 4 is installed inside the frame 1. Specifically, a mounting frame 41 is horizontally connected between the frame 1 containing the infeed conveyor belt 2 and the discharge conveyor belt 3, and two mounting frames 41 are symmetrically arranged. Two sets of grinding sections are arranged side by side between the two mounting frames 41. Each grinding section includes upper and lower grinding wheels 43, and the two ends of the grinding wheels 43 are firmly installed on the aforementioned mounting frame 41 through bearing seats 42. The grinding wheels 43 of the two sets of grinding sections rotate in opposite directions. For example, the upper and lower grinding wheels 43 of the left grinding section rotate counterclockwise, and the upper and lower grinding wheels 43 of the right grinding section rotate clockwise.

[0027] To drive the grinding wheels 43 to rotate, two drive motors 44 are symmetrically arranged inside the frame 1. These two drive motors 44 are respectively connected to the lower grinding wheels 43 of the two grinding sections via a first pulley unit 45; simultaneously, the upper and lower grinding wheels 43 of the same group are connected to each other via a second pulley unit 46. When the grinding mechanism 4 is started, the two drive motors 44 operate, and through the transmission cooperation of the first pulley unit 45 and the second pulley unit 46, drive the two sets of grinding wheels 43 rotating in opposite directions to rotate synchronously, performing double-sided cutting on the moving metal sheet.

[0028] When the system enters the processing operation state, the metal sheet to be processed is first placed on the feeding conveyor belt 2, which supports it and feeds it horizontally into the grinding area inside the frame 1 at a set travel speed.

[0029] Simultaneously, the two drive motors 44 symmetrically arranged inside the frame 1 are simultaneously powered on and started. The output power of the drive motors 44 is first transmitted to the lower grinding wheels 43 of the left and right grinding sections via the first pulley units 45 on both sides, driving the lower grinding wheels 43 to rotate initially. Then, this rotational power is transmitted upward by the second pulley unit 46 arranged between the upper and lower grinding wheels 43 of the same group. Through this two-stage belt drive mechanism, it is ensured that the upper grinding wheel 43 and the lower grinding wheel 43 of each group can maintain the same speed and operate synchronously.

[0030] When the front end of the metal sheet is guided by the feeding conveyor belt 2 into the cutting gap between the upper and lower grinding wheels 43 of the first grinding section on the left, the surfaces of the upper and lower grinding wheels 43 on the left, which rotate counterclockwise, come into contact with the metal sheet, applying cutting friction to its upper and lower surfaces simultaneously, completing the initial double-sided grinding operation. As the sheet continues to move forward, it enters the second grinding section on the right, where the upper and lower grinding wheels 43 on the right, which rotate clockwise, perform secondary polishing and cutting on the upper and lower surfaces of the sheet.

[0031] In order to clean the surface of the metal sheet and grinding wheel 43 during the grinding process and effectively prevent secondary dust adhesion, such as Figures 4-7 As shown, dust blowing components 5 are provided on both sides of the grinding mechanism 4. The dust blowing components 5 include two sets of blowing parts and two sets of dust extraction parts.

[0032] Specifically, the two sets of blowing sections are respectively located on the outer sides of the two sets of grinding sections. Each set of blowing sections includes support seats 51 located on the upper and lower surfaces of the mounting brackets 41 on both sides. An air blowing pipe 52 is fixedly installed between the two support seats 51 symmetrically arranged on the mounting brackets 41 on both sides. At the same time, a conveying roller 53 is coaxially sleeved and rotatably connected to the air blowing pipe 52. The conveying roller 53 is used to support and convey the metal sheet. The conveying roller 53 is mounted on the support seats 51 on both sides through bearings, and is connected to the conveying roller at the end of the adjacent feed conveyor belt 2 or discharge conveyor belt 3 through a third belt drive unit.

[0033] Specifically, for the grinding section on the left, the upper air pipe 52 of the corresponding blowing section has an upward-sloping strip-shaped opening 521 facing the edge of the upper grinding wheel 43 on the left, and the lower air pipe 52 has two downward-sloping strip-shaped openings 521, one of which faces the feeding conveyor belt 2 and the other faces the lower grinding wheel 43 on the left. Similarly, for the grinding section on the right, the upper air pipe 52 of the corresponding blowing section has an upward-sloping strip-shaped opening 521 facing the edge of the upper grinding wheel 43 on the right, and the lower air pipe 52 has two downward-sloping strip-shaped openings 521, one of which faces the discharging conveyor belt 3 and the other faces the lower grinding wheel 43 on the right. With the above configuration, during actual operation, the upper air pipe 52 always provides an upward-sloping airflow, and the lower air pipe 52 always provides a downward-sloping airflow, which cleans the surface of their respective components, thereby effectively preventing the airflow from carrying dust and causing it to re-adhere to the surface of the metal sheet.

[0034] Furthermore, a plurality of ventilation holes 531 are evenly provided around the conveying roller 53. High-pressure gas is suitable for being ejected from the ventilation holes 531 on the outside of the conveying roller 53 through the strip-shaped opening 521. In order to stably supply air to the air blowing pipe 52, the ends of the upper and lower air blowing pipes 52 on the same side are connected by a Y-shaped air pipe 54. The Y-shaped air pipe 54 has an air inlet 541, which is used to connect to an external air supply device.

[0035] When the grinding mechanism 4 continuously cuts the metal sheet, the dust blowing assembly 5 arranged on the outside of the grinding section simultaneously performs surface cleaning and airflow guiding operations. The external high-pressure gas is first introduced through the air inlet 541 of the Y-shaped air pipe 54, and then evenly distributed and filled into the upper and lower air blowing pipes 52 on the same side.

[0036] During the movement of the metal sheet, the outer conveyor roller 53 continuously rotates under the drive of the belt drive unit to support and transport the metal sheet forward; while the inner air blowing pipe 52 remains absolutely still because it is fixed between the support seats 51. As a result, the high-pressure gas filled into the air blowing pipe 52 is ejected along the pipe wall at an angle towards the constant strip-shaped opening 521 by its own pressure, and then passes through the constantly overlapping air holes 531 on the outer rotating conveyor roller 53, forming a high-speed airflow with a stable direction.

[0037] The upper air pipes 52 on the left and right sides are restricted by the internal strip-shaped openings 521, and always spray upward airflow through the conveyor rollers 53. This airflow continuously and dynamically sweeps the cutting edges of the upper grinding wheels 43 on both sides. The lower air pipe 52 on the left side sprays two downward airflows to sweep the end of the feed conveyor belt 2 and the surface of the lower grinding wheel 43 on the left side, respectively. The lower air pipe 52 on the right side also sprays two downward airflows to sweep the end of the discharge conveyor belt 3 and the surface of the lower grinding wheel 43 on the right side, respectively.

[0038] In order to concentrate and suck up the dust cleaned up during the polishing operation, such as Figures 6-8 As shown, two dust extraction sections are respectively arranged between the blowing section and the adjacent grinding section. The dust extraction section includes a first suction pipe 55 that is mounted on the upper and lower mounting bracket 41 via a bracket. The first suction pipe 55 is parallel to the upper and lower blowing pipes 52. The first suction pipe 55 has a long strip-shaped first dust suction port 551, which is directly opposite the cutting contact area between the grinding wheel 43 and the metal plate, thereby realizing the concentrated collection of locally scattered dust. The end of the first suction pipe 55 is connected to the first air inlet pipe 552.

[0039] Meanwhile, a second suction pipe 56 is fixed on the mounting frame 41 by the frame body. There are two second suction pipes 56, which are distributed above and below the metal sheet conveying path and are correspondingly set between the two sets of grinding parts arranged side by side. The second suction pipe 56 has two second dust suction ports 561 symmetrically opened along its length direction. The two second dust suction ports 561 are respectively facing the cutting contact area between the grinding wheels 43 on both sides and the metal sheet, so as to concentrate the suction of dust generated by the grinding wheels 43 on both sides during the grinding operation. The end of the second suction pipe 56 is also connected to a second air inlet pipe 562.

[0040] When the grinding wheel 43 performs continuous cutting operations on the metal sheet, metal and abrasive dust will be generated in the cutting contact area. The dust extraction units distributed on the outside and in the middle of the grinding area rely on the negative pressure environment created in the pipeline by the external negative pressure equipment to simultaneously perform local dust extraction.

[0041] The first suction pipe 55, located between the blowing section and the adjacent grinding section, is under continuous negative pressure. The elongated first dust suction port 551 on the first suction pipe 55 faces the cutting contact area between the grinding wheel 43 and the metal sheet, creating a localized negative pressure zone at the initial source of dust dispersion. Combined with the airflow from the adjacent blowing section, the first dust suction port 551 can draw the scattered dust generated during cutting into the pipe, which is then discharged outwards via the first air inlet pipe 552.

[0042] The second suction pipe 56, fixed between the two sets of parallel grinding sections, is also under negative pressure. Because it has two symmetrically arranged second dust inlets 561 along its length, facing the cutting contact areas between the grinding wheels 43 and the metal sheet on both sides, the second suction pipe 56 simultaneously applies negative pressure suction to the grinding points on both the left and right sides during processing. This structure collects the dust thrown out by the counter-rotating grinding wheels 43 and then discharges it outwards through the second air inlet pipe 562.

[0043] By combining the unidirectional suction of the first suction pipe 55 outside the grinding area with the bidirectional concentrated suction of the second suction pipe 56 in the middle of the grinding area, the system forms a multi-point covered negative pressure absorption structure near the cutting area where dust is generated, thus realizing the fixed-point concentrated collection of locally scattered dust.

[0044] like Figures 3-4 As shown, in order to further extract dust from the overall space, a dust collection mechanism 6 is also provided in the system. Specifically, a top dust collection hood 61 is provided at the top of the inner wall of the frame 1 to cover the grinding area from above, and a bottom dust collection hood 62 is provided at the bottom of the inner wall of the frame 1 to cover the grinding area from below. A main exhaust pipe 63 is connected between the top dust collection hood 61 and the bottom dust collection hood 62, wherein the first air inlet pipe 552 and the second air inlet pipe 562 are both connected to the main exhaust pipe 63, and an external pipe 64 is connected to the main exhaust pipe 63. The external pipe 64 is used to connect to an external negative pressure device, and works in conjunction with the external negative pressure device to uniformly and smoothly discharge the dust collected locally and covered as a whole to the outside of the frame 1.

[0045] During the grinding operation, in order to prevent dust that is not collected by the local exhaust pipe from spreading inside the frame 1, the dust collection mechanism 6 performs a centralized exhaust action on the entire space.

[0046] After the external negative pressure equipment is started, a continuous global negative pressure environment is established in the main exhaust pipe 63 and the connected dust collection hood through the external pipe 64. Under this negative pressure, the top dust collection hood 61 at the top of the inner wall of the frame 1 and the bottom dust collection hood 62 at the bottom form a large negative pressure coverage area above and below the polishing area, respectively. Dust that escapes and scatters during the polishing process and is not collected by the local dust collection unit is drawn into the main exhaust pipe 63 by the spatial airflow generated by the upper and lower dust collection hoods. The main exhaust duct 63 maintains a high-intensity suction state. The dust collected in the cutting contact area by the local dust extraction section (introduced through the first air inlet pipe 552 and the second air inlet pipe 562) and the diffused dust collected by the top dust extraction hood 61 and the bottom dust extraction hood 62 converge inside the main exhaust duct 63. The dust-laden airflow after the convergence is discharged to the outside of the frame 1 through the external pipe 64 under the continuous suction power of the external equipment.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A continuous polishing system for a flat surface of metal sheet, characterized in that, include: Two sets of conveyor belts, spaced apart, are suitable for conveying sheet metal; Two grinding sections are set between two sets of conveyor belts, and each grinding section includes upper and lower corresponding grinding wheels (43). The blowing section and the dust extraction section are located on both sides of the two sets of polishing sections; The blowing section includes an upper blowing pipe (52) and a lower blowing pipe (52), as well as conveying rollers (53) that are respectively sleeved on the outside of the corresponding blowing pipes (52) and rotate; the blowing pipes (52) have a strip-shaped opening (521), and the conveying rollers (53) have a plurality of air holes (531). The strip-shaped opening (521) of the upper air blowing pipe (52) is obliquely upward toward the edge of the corresponding upper grinding wheel (43); The lower air pipe (52) has two downward-sloping strip-shaped openings (521), which are respectively inclined downward toward the edge of the adjacent conveyor belt and the edge of the corresponding grinding wheel (43) below. The dust extraction assembly includes a first dust extraction section and a second suction pipe (56); the first dust extraction section is disposed between the blowing section and the adjacent polishing section; the second suction pipe (56) is disposed between two sets of parallel polishing sections and has two second dust extraction ports (561). The first dust extraction section and the second dust extraction port (561) are both facing the cutting contact area between the grinding wheel (43) and the metal plate, which is suitable for cooperating with the blowing section to extract dust.

2. The continuous planar polishing system for metal sheets according to claim 1, characterized in that: The ends of the upper air pipe (52) and the lower air pipe (52) located on the same side are connected by a Y-shaped air pipe (54), which has an air inlet (541) suitable for connection with an external air supply device.

3. The continuous planar polishing system for metal sheets according to claim 1, characterized in that: The first dust extraction unit includes a first suction pipe (55) located above and below the metal sheet conveying path, the first suction pipe (55) being parallel to the upper air blowing pipe (52) and the lower air blowing pipe (52), and the first suction pipe (55) having a long strip-shaped first dust extraction port (551).

4. The continuous planar polishing system for metal sheets according to claim 3, characterized in that: There are two second suction pipes (56), which are respectively distributed above and below the metal sheet conveying path. The ends of the first suction pipe (55) and the second suction pipe (56) are respectively connected to the first air inlet pipe (552) and the second air inlet pipe (562).

5. A continuous planar polishing system for metal sheets according to claim 1, characterized in that: The conveying roller (53) is adapted to be synchronously driven connected to the end conveying roller of the adjacent conveyor belt via a transmission assembly.

6. The continuous planar polishing system for metal sheets according to claim 1, characterized in that: The grinding wheels (43) of the two sets of grinding sections are arranged in opposite directions.

7. A continuous planar polishing system for metal sheets according to claim 4, characterized in that: It also includes the rack (1); The two sets of conveyor belts are a feeding conveyor belt (2) and a discharging conveyor belt (3), which are respectively set at both ends of the frame (1); Two symmetrically arranged mounting brackets (41) are horizontally connected between the frame (1) where the feeding conveyor belt (2) and the discharging conveyor belt (3) are located. The two ends of the grinding wheels (43) of the two sets of grinding parts are mounted on the mounting bracket (41) through bearing seats (42).

8. A continuous planar polishing system for metal sheets according to claim 7, characterized in that: It also includes two drive motors (44) symmetrically arranged inside the frame (1). The two drive motors (44) are respectively connected to the grinding wheels (43) below the two sets of grinding sections through the first pulley unit (45); the grinding wheels (43) arranged in the same group are connected to each other through the second pulley unit (46).

9. A continuous planar polishing system for metal sheets according to claim 7, characterized in that: It also includes a dust collection mechanism (6), which includes a top dust collection hood (61) located at the top of the inner wall of the frame (1) and suitable for covering the grinding area, and a bottom dust collection hood (62) located at the bottom of the inner wall of the frame (1). A main exhaust pipe (63) is connected between the top dust collection hood (61) and the bottom dust collection hood (62).

10. A continuous planar polishing system for metal sheets according to claim 9, characterized in that: The first air inlet pipe (552) and the second air inlet pipe (562) are both connected to the main exhaust pipe (63), and an external pipe (64) suitable for connecting to an external negative pressure device is connected to the main exhaust pipe (63).

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