Profile steel surface rust removal device and method

Abstract

The invention belongs to the technical field of polishing and rust removal, and particularly relates to a profile steel surface rust removal device and method. The grinding and rust removing machine comprises a shell, a motor, a grinding disc and a rust removing brush and further comprises a dust removing assembly and a clamping assembly, the clamping assembly is arranged on the dust removing assembly, the clamping assembly comprises a circular ring, two clamping rods and two moving rods, and the dust removing assembly comprises a shell, a transmission shaft, rotating blades, a bottom cover and a collecting box. Due to the fact that the polishing machine slides and deviates due to inertia of high-speed rotation, the polishing and derusting efficiency is reduced, a large amount of rust slag and smoke dust can be generated, the body health of workers is affected, the polishing and derusting machine does not slide and deviate when derusting steel, the polishing and derusting efficiency is greatly improved, and meanwhile the polishing and derusting efficiency is improved. And drift of rust slag and smoke dust is prevented, and the body health of workers is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding and rust removal, and in particular relates to a device and method for removing rust from the surface of a section steel. Background Art

[0002] When steel materials such as special-shaped steel pipes and channel steels are stacked for a long time, their surfaces will react with the air and cause rust on the surfaces. When the steel materials are used, they need to be derusted.

[0003] In the existing steel rust removal, a small handheld grinder is generally used to grind and remove rust from steel pipes, channel steels and other steels. For example, Chinese patent: 201910212317.4, published on 2019-05-14, discloses a grinder for metal grinding and rust removal, including a mainframe, a handle, a power switch, a power cord, a connector, and a grinding disc. The handle is installed at the top of the front end of the mainframe, the power switch is installed on the left side wall of the mainframe, and the power cord is installed at the rear end of the mainframe. The grinding disc is connected to the mainframe through the connector. The invention adopts a multi-axis linkage mode to work, improves the grinding efficiency, and saves operation time. However, during the rust removal process, due to the inertia of the high-speed rotation of the grinder, it will slip and deviate when the contact surface is small, so that the light wire brush on the grinder cannot be fully in contact with the steel, thereby reducing the grinding and rust removal efficiency and posing a large safety hazard. At the same time, during the grinding process, the rust residue and smoke dust polished off are more, which will flow with the air and affect the health of the workers.

[0004] Therefore, the present invention provides a device and method for removing rust from the surface of section steel. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that when the existing grinding and rust removal machine is removing rust on steel, the grinder will slip and deviate due to the inertia of high-speed rotation, resulting in reduced grinding and rust removal efficiency, and a large amount of rust residue and smoke will be generated, affecting the health of workers. The grinding and rust removal machine will not slip and deviate when removing rust on steel, thereby greatly improving the efficiency of grinding and rust removal. At the same time, the dispersion of rust residue and smoke is prevented, ensuring the health of workers.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme: a device for removing rust from the surface of a section steel, comprising: handle; A housing, disposed on the handle; A motor is arranged inside the housing; A grinding disc, wherein the grinding disc is connected to the motor through a transmission assembly; A rust removal brush is arranged at the bottom of the grinding disc; Also includes, The dust removal component is used to absorb the rust slag and smoke from grinding. A clamping assembly is provided on the dust removal assembly, and the clamping assembly is used to clamp the steel section. The clamping assembly includes: A ring, provided on the dust removal component; Two clamping rods, each of which is a U-shaped structure, one end of each clamping rod is connected to the ring, and the other end extends to below the dust removal assembly; Two moving rods are slidably arranged at the other end of the clamping rod, and the moving rods are used to clamp on both sides of the steel section; The dust removal component comprises: A housing, disposed at one end of the housing; A transmission shaft, one end of which is connected to the transmission assembly and passes through the housing, and the other end of which is connected to the grinding disc; Rotating blades are arranged on the transmission shaft; A bottom cover is arranged inside the shell, and the transmission shaft rotates through the bottom cover. The bottom cover is located above the grinding disc. The bottom cover is used to separate the grinding space from the dust removal space, and to enable the dust removal space to generate a large negative pressure, thereby absorbing the rust residue and smoke after grinding; A collection box, disposed at the bottom of the housing and communicated with the outer shell; When the motor rotates to drive the rust removal brush on the grinding disc to rotate and remove rust from the surface of the steel section, the two moving rods will be clamped on both sides of the steel section. At the same time, the rotating blades will also rotate with the rotation of the rust removal brush, and absorb the external rust residue and smoke into the inside of the shell, and then enter the collection box.

[0007] Preferably, the transmission assembly comprises: A round cover, disposed on the top of the outer shell and connected to the shell; An output shaft is horizontally arranged on the motor, and an output end of the output shaft is located in the circular cover; A first bevel gear is disposed on the output end of the output shaft, and the first bevel gear is located in the circular cover; The second bevel gear is arranged on the transmission shaft and meshes with the first bevel gear. The second bevel gear is located in the circular cover.

[0008] Preferably, an inclined connecting pipe is provided between the outer shell and the collecting box, and the connecting pipe is used for the circulation of rust, slag and smoke.

[0009] Preferably, the housing comprises: A cylinder shell connected to one end of the connecting pipe, wherein an annular groove is formed at the bottom of the cylinder shell; A moving ring is arranged at the bottom of the cylinder shell, and an annular protrusion is arranged on the moving ring, and the annular protrusion cooperates with the annular groove; A plurality of first springs have one end connected to the bottom of the annular groove and the other end connected to the annular protrusion.

[0010] Preferably, a rectangular groove is provided on one end of the clamping rod connected to the moving rod, and a second spring is provided in the rectangular groove and connected to the moving rod.

[0011] Preferably, the moving rod is provided with a roller.

[0012] Preferably, a first screen, a second screen and a third screen are provided in sequence inside the collecting box in a direction away from the connecting pipe, and the third screen is located on the side wall of the collecting box away from the connecting pipe, and the apertures of the first screen, the second screen and the third screen decrease in sequence.

[0013] Preferably, the shell body and the round cover are connected via a rectangular shell, and the output shaft is located inside the rectangular shell.

[0014] Preferably, the outer shell and the bottom cover are connected via a plurality of brackets, and the height of the bottom cover is equal to the height of the grinding disc.

[0015] A method for removing rust from the surface of a section steel comprises the following steps: S1: Place the grinder on the surface of the steel, pull the moving rod on the bottom clamping assembly, the two moving rods move outwards respectively and compress the second spring inside, then release the moving rods, the two moving rods move inwards by the elastic potential energy of the second spring, the rollers on the moving rods contact the two sides of the steel and clamp the steel; S2: Start the motor, the motor rotates to drive the output shaft to rotate, the output shaft drives the first bevel gear to rotate, and the power is transmitted to the second bevel gear, the second bevel gear drives the transmission shaft to rotate, and drives the rust removal brush on the grinding disc to rotate, and grind and remove the rust on the surface of the steel; S3: The transmission shaft rotates to drive the rotating blades to rotate. The rotating blades draw in the outside air and absorb the rust residue and smoke after grinding into the inside of the shell, and then enter the collection box through the connecting pipe on the shell; S4: The adsorbed rust and smoke enter the collection box and are filtered through the first, second and third sieves. Large particles of rust are filtered by the first sieve, and small particles of smoke are filtered and removed by the second and third sieves. The remaining air is discharged from the third sieve.

[0016] Beneficial effects of the present invention: 1. The present invention provides a dust removal component and a clamping component on the shell. Through the cooperation between the dust removal component and the clamping component, slipping and deviation will not occur when grinding steel. In addition, the adsorption of the dust removal mechanism prevents the rust residue and smoke from floating, greatly improving the efficiency of grinding and rust removal, and ensuring the health of workers.

[0017] 2. The present invention provides a rotating blade inside the dust removal component. The rotating blade can absorb the rust residue and smoke after grinding and send them into the collection box through rotation, thereby preventing the rust residue and smoke from floating and ensuring the health of the workers. At the same time, a first spring is provided in the outer shell, so that during the grinding process, the outer shell can be closely attached to the surface of the steel material, and further absorb the rust residue and smoke, thereby improving the efficiency of dust removal.

[0018] 3. The present invention provides a second spring and a moving rod on the clamping assembly, so that the moving rod can always be in contact with the side of the steel through the second spring, and during the grinding process, the stable performance of the grinding is guaranteed. At the same time, there is no need to manually adjust the length of the moving rod, so it can be suitable for steels of different sizes and clamp steels of different sizes, thereby improving the convenience of use.

[0019] 4. The present invention provides a first screen, a second screen and a third screen in the collection box, and filters rust, slag and smoke in the air through screens with different apertures, thereby ensuring that the dust removal component can operate continuously and allowing the air to circulate, thereby greatly improving the efficiency of dust removal.

[0020] 5. The present invention provides a handle on the shell and increases the length of the handle, so that the labor intensity of workers during grinding operations can be reduced and work efficiency can be improved. At the same time, smoke inhalation is prevented, and the operation is convenient and safe to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention without a handle.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure inside the dust removal component and the transmission component of the present invention.

[0024] Figure 4 It is a partial cross-sectional view of the housing, dust removal assembly and transmission assembly of the present invention.

[0025] Figure 5 For the present invention Figure 4 Enlarged view of point A above.

[0026] Figure 6It is a cross-sectional view of the clamping assembly of the present invention.

[0027] Figure 7 For the present invention Figure 6 Enlarged view of point B above.

[0028] In the figure: 1, handle; 2, shell; 21, rectangular shell; 3, motor; 4, grinding disc; 5, transmission assembly; 51, round cover; 52, output shaft; 53, first bevel gear; 54, second bevel gear; 6, rust removal brush; 7, dust removal assembly; 71, outer shell; 711, cylinder shell; 712, annular groove; 713, moving ring; 714, annular protrusion; 715, first spring; 72, transmission shaft; 73, rotating blade; 74, bottom cover; 741, bracket; 75, collection box; 751, first screen; 752, second screen; 753, third screen; 76, connecting pipe; 8, clamping assembly; 81, circular ring; 82, clamping rod; 821, rectangular groove; 822, second spring; 83, moving rod; 831, roller. DETAILED DESCRIPTION

[0029] The method for using the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figures 1 to 7 As shown, a device for removing rust from the surface of a section steel comprises: Handle 1: used for holding and reducing the operator's inhalation of smoke and dust.

[0031] A housing 2, provided on the handle 1; The motor 3 is arranged inside the housing 2 and is used to drive the rust removal brush 6 to rotate and grind the surface of the steel section.

[0032] A grinding disc 4, wherein the grinding disc 4 is connected to the motor 3 via a transmission assembly 5; The rust removal brush 6 is arranged at the bottom of the grinding disc 4 and is used for removing rust on the surface of the steel.

[0033] Also includes, The dust removal component 7 is used to absorb the rust slag and smoke generated during grinding. The clamping assembly 8 is arranged on the dust removal assembly 7. The clamping assembly 8 is used to clamp the steel section. The clamping assembly 8 includes: The circular ring 81 is arranged on the dust removal component 7 and is used to be fixed on the dust removal component 7 so that the clamping component 8 can be stably clamped on the steel section and polished.

[0034] Two clamping rods 82 are U-shaped structures, one end of each clamping rod 82 is connected to the ring 81, and the other end extends to the bottom of the dust removal assembly 7; the U-shaped structure is to enable the rust removal device to be clamped on the steel section, and during the grinding process, the rust removal device can be moved so that the rust removal device will not be offset.

[0035] Two movable rods 83 are respectively slidably arranged at the other end of the clamping rod 82, and the movable rods 83 are used to clamp on both sides of the steel section; the two movable rods 83 slide to adapt to steel sections of different sizes and clamp the steel sections to ensure that the entire dust removal device will not shift during the grinding and moving process, thereby ensuring its rust removal efficiency.

[0036] like Figure 3 and Figure 4 As shown, the dust removal component 7 includes: A housing 71 is provided at one end of the housing 2; The transmission shaft 72 has one end connected to the transmission assembly 5 and passes through the housing 71, and the other end connected to the grinding disc 4; the transmission shaft 72 is used to transmit power to the rotating blades 73 and also to the rust removal brush 6 to grind the steel.

[0037] The rotating blades 73 are arranged on the transmission shaft 72; when the transmission shaft 72 drives the rotating blades 73 to rotate, the external air is drawn into the interior thereof, thereby achieving the adsorption of rust residue and smoke, and preventing the rust residue and smoke from floating in the air and affecting the health of the operator.

[0038] The bottom cover 74 is arranged inside the housing 71, and the transmission shaft 72 rotates through the bottom cover 74. The bottom cover 74 is located above the grinding disc 4. The bottom cover 74 is used to separate the grinding space from the dust removal space, and enable the dust removal space to generate a large negative pressure, thereby absorbing the rust residue and smoke after grinding; The collecting box 75 is disposed at the bottom of the shell 2 and is connected to the outer shell 71 ; it is used to collect the adsorbed rust slag and smoke, thereby preventing the rust slag and smoke from floating in the air, causing pollution to the environment, and affecting human health.

[0039] When the motor 3 rotates to drive the rust removal brush 6 on the grinding wheel 4 to rotate and remove rust from the surface of the steel section, the two moving rods 83 will be clamped on both sides of the steel section. At the same time, the rotating blades 73 will also rotate with the rotation of the rust removal brush 6, and absorb the external rust residue and smoke into the inside of the shell 71, and then enter the collection box 75.

[0040] like Figure 3 and Figure 4 As shown, the transmission assembly 5 includes: A round cover 51 is disposed on the top of the housing 71 and connected to the housing 2; An output shaft 52 is horizontally arranged on the motor 3, and an output end of the output shaft 52 is located inside the circular cover 51; A first bevel gear 53 is provided on the output end of the output shaft 52, and the first bevel gear 53 is located inside the circular cover 51; The second bevel gear 54 is disposed on the transmission shaft 72 and meshes with the first bevel gear 53. The second bevel gear 54 is located in the circular cover 51. The power of the motor 3 is converted through the bevel gear and transmitted to the dust removal assembly 7 and the rust removal brush 6, so that the rust residue and smoke generated can be adsorbed while grinding the steel.

[0041] An inclined connecting pipe 76 is provided between the housing 71 and the collecting box 75, and the connecting pipe 76 is used for the circulation of rust, slag and smoke. The inclined connecting pipe 76 helps the rust, slag and smoke to enter the collecting box 75. At the same time, when too much rust is accumulated in the collecting box 75, it will not fall into the housing 71 through the inclined connecting pipe 76.

[0042] like Figure 4 and Figure 5 As shown, the housing 71 includes: The cylinder shell 711 is connected to one end of the connecting pipe 76, and an annular groove 712 is formed at the bottom of the cylinder shell 711; A moving ring 713 is disposed at the bottom of the cylindrical shell 711. The moving ring 713 is provided with an annular protrusion 714, and the annular protrusion 714 cooperates with the annular groove 712; A plurality of first springs 715 have one end connected to the bottom of the annular groove 712 and the other end connected to the annular protrusion 714 .

[0043] It should be noted that in order to ensure that the rust residue and smoke can be adsorbed and collected to the maximum extent during the grinding and rust removal process, the bottom of the cylinder shell 711 and the bottom of the rust removal brush 6 are in the same plane. During the grinding process, the rust removal device will receive downward pressure, so that the first spring 715 in the movable ring 713 will be compressed, and the movable ring 713 will move upward with the pressure, thereby always ensuring that the rust residue after grinding by the rust removal brush 6 can be as much as possible inside the cylinder shell 711, and it is adsorbed by the negative pressure formed by the rotation of the rotating blades 73. The moving distance of the movable ring 713 varies with the size of the force and the grinding and rust removal conditions, which will not affect the entire grinding process.

[0044] like Figure 6 and Figure 7As shown, a rectangular groove 821 is provided on one end of the clamping rod 82 connected to the moving rod 83, and a second spring 822 is provided in the rectangular groove 821 and connected to the moving rod 83. The second spring 822 is used to clamp the steel section by its own elastic potential energy, and can be applied to steel sections of different sizes, thereby avoiding the rust removal device from being offset during the grinding and rust removal process.

[0045] The moving rod 83 is provided with a roller 831. This is to ensure that the rust removal device can move horizontally on the steel during the grinding process.

[0046] The first screen 751, the second screen 752 and the third screen 753 are arranged in sequence in the direction away from the connecting pipe 76 inside the collecting box 75, and the third screen 753 is located on the side wall of the collecting box 75 away from the connecting pipe 76, and the apertures of the first screen 751, the second screen 752 and the third screen 753 decrease in sequence. It should be noted that the apertures on the first screen 751, the second screen 752 and the third screen 753 are different, which are used to filter rust residue of different sizes and collect them, and at the same time, ensure the circulation of air so that the polished rust residue can be continuously adsorbed into the inside of the collecting box 75.

[0047] The housing 2 and the circular cover 51 are connected via the rectangular shell 21 , and the output shaft 52 is located inside the rectangular shell 21 .

[0048] The housing 71 is connected to the bottom cover 74 via a plurality of brackets 741, and the height of the bottom cover 74 is equal to the height of the grinding disc 4. This is to ensure that the rust residue after grinding can be quickly adsorbed.

[0049] A method for removing rust from the surface of a section steel comprises the following steps: S1: Place the grinder on the surface of the steel material, pull the moving rod 83 on the bottom clamping assembly 8, the two moving rods 83 move outwards respectively, and compress the second spring 822 inside, then release the moving rod 83, the two moving rods 83 move inwards by the elastic potential energy of the second spring 822, and the rollers 831 on the moving rod 83 contact the two sides of the steel material and clamp the steel material; S2: Start the motor 3, the motor 3 rotates to drive the output shaft 52 to rotate, the output shaft 52 drives the first bevel gear 53 to rotate, and transmits power to the second bevel gear 54, the second bevel gear 54 drives the transmission shaft 72 to rotate, and drives the rust removal brush 6 on the grinding disc 4 to rotate, so as to grind and remove the rust on the surface of the steel; S3: The transmission shaft 72 rotates to drive the rotating blades 73 to rotate. The rotating blades 73 draw in the outside air and absorb the polished rust residue and smoke into the housing 71, and then enter the collection box 75 through the connecting pipe 76 on the housing 71; S4: The adsorbed rust residue and smoke enter the collection box 75 and are filtered by the first sieve 751, the second sieve 752 and the third sieve 753. Large particles of rust residue are filtered by the first sieve 751, and small particles of smoke are filtered and removed by the second sieve 752 and the third sieve 753. The remaining air is discharged from the third sieve 753.

[0050] Working process: When grinding steel, first place the grinder on the surface of the steel, manually pull the moving rod 83 on the bottom clamping assembly 8, so that the two moving rods 83 move outward respectively, the two moving rods 83 move outward, and compress the internal second spring 822, and then release the moving rod 83, so that the two moving rods 83 move inward through the elastic potential energy of the second spring 822, the roller 831 on the moving rod 83 will contact both sides of the steel and clamp the steel, and during the grinding process, the roller 831 on the moving rod 83 will roll on the side of the steel to ensure stable performance during the grinding process.

[0051] Then the worker holds the handle 1 and starts the motor 3. The rotation of the motor 3 will drive the output shaft 52 to rotate, and the output shaft 52 will drive the first bevel gear 53 to rotate, and transmit the power to the second bevel gear 54. The second bevel gear 54 will drive the transmission shaft 72 to rotate, so that the transmission shaft 72 drives the rust removal brush 6 on the grinding disc 4 to rotate, and grinds away the rust on the surface of the steel. The rust residue ground off will be thrown around the rust removal brush 6 due to the action of centrifugal force.

[0052] During grinding, the rotation of the transmission shaft 72 will also drive the rotating blades 73 to rotate. The rotation of the rotating blades 73 will draw air from the outside and absorb the rust residue and smoke dust after grinding into the inside of the shell 71, and then enter the inside of the collecting box 75 through the connecting pipe 76 on the shell 71. Since the outside air is continuously drawn, the air entering the collecting box 75 will be filtered by the first screen 751, the second screen 752 and the third screen 753 and return to the outside, thus forming a circulation flow. Large particles of rust residue will be filtered by the first screen 751, and small particles of smoke dust will be filtered and removed by the second screen 752 and the third screen 753. The smoke dust is completely removed, which greatly improves the efficiency of grinding and rust removal.

[0053] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for removing rust from the surface of a section steel, comprising: Handle (1); A housing (2) disposed on the handle (1); A motor (3) is arranged inside the housing (2); A grinding disc (4), wherein the grinding disc (4) is connected to the motor (3) via a transmission assembly (5); A rust removal brush (6) is arranged at the bottom of the grinding disc (4); It is characterized by also including: A dust removal component (7), wherein the dust removal component (7) is used to absorb rust slag and smoke generated during grinding. A clamping assembly (8) is provided on the dust removal assembly (7), the clamping assembly (8) is used to clamp the steel section, and the clamping assembly (8) comprises: A circular ring (81) provided on the dust removal component (7); Two clamping rods (82), the clamping rods (82) being of a U-shaped structure, one end of each clamping rod (82) being connected to the circular ring (81), and the other end extending to below the dust removal assembly (7); Two moving rods (83) are respectively slidably disposed on the other end of the clamping rod (82), and the moving rods (83) are used to clamp on both sides of the steel section; The dust removal component (7) comprises: An outer shell (71) is arranged at one end of the shell (2); A transmission shaft (72), one end of which is connected to the transmission assembly (5) and passes through the housing (71), and the other end of which is connected to the grinding disc (4); A rotating blade (73) is arranged on the transmission shaft (72); A bottom cover (74) is arranged inside the outer shell (71), and the transmission shaft (72) rotates through the bottom cover (74). The bottom cover (74) is located above the grinding disc (4). The bottom cover (74) is used to separate the grinding space from the dust removal space and enable the dust removal space to generate a large negative pressure, thereby absorbing rust residue and smoke after grinding; A collection box (75) is disposed at the bottom of the housing (2) and is in communication with the outer shell (71); When the motor (3) rotates to drive the rust removal brush (6) on the grinding disc (4) to rotate and remove rust from the surface of the steel section, the two moving rods (83) will be clamped on both sides of the steel section. At the same time, the rotating blades (73) will also rotate with the rotation of the rust removal brush (6) and absorb the external rust residue and smoke into the inside of the shell (71), thereby entering the collection box (75).

2. A device for removing rust from the surface of section steel according to claim 1, characterized in that: The transmission assembly (5) comprises: A round cover (51) is disposed on the top of the outer shell (71) and is connected to the housing (2); An output shaft (52) is horizontally arranged on the motor (3), and an output end of the output shaft (52) is located inside the round cover (51); A first bevel gear (53) is disposed on the output end of the output shaft (52), and the first bevel gear (53) is located inside the circular cover (51); The second bevel gear (54) is disposed on the transmission shaft (72) and meshes with the first bevel gear (53); the second bevel gear (54) is located inside the circular cover (51).

3. A device for removing rust from the surface of section steel according to claim 1, characterized in that: An inclined connecting pipe (76) is provided between the outer shell (71) and the collecting box (75), and the connecting pipe (76) is used for the circulation of rust, slag, and smoke.

4. A device for removing rust from the surface of section steel according to claim 1, characterized in that: The housing (71) comprises: A cylindrical shell (711) connected to one end of the connecting pipe (76), wherein an annular groove (712) is formed at the bottom of the cylindrical shell (711); A movable ring (713) is arranged at the bottom of the cylindrical shell (711); an annular protrusion (714) is provided on the movable ring (713); and the annular protrusion (714) and the annular groove (712) cooperate with each other; A plurality of first springs (715) have one end connected to the bottom of the annular groove (712) and the other end connected to the annular protrusion (714).

5. The device for removing rust from the surface of profiled steel according to claim 1, characterized in that: A rectangular groove (821) is provided on one end of the clamping rod (82) connected to the moving rod (83); a second spring (822) is provided in the rectangular groove (821) and is connected to the moving rod (83).

6. A device for removing rust from the surface of section steel according to claim 5, characterized in that: The moving rod (83) is provided with a roller (831).

7. A device for removing rust from the surface of section steel according to claim 1, characterized in that: A first screen (751), a second screen (752) and a third screen (753) are provided in sequence inside the collecting box (75) in a direction away from the connecting pipe (76), and the third screen (753) is located on a side wall of the collecting box (75) away from the connecting pipe (76), and the apertures of the first screen (751), the second screen (752) and the third screen (753) decrease in sequence.

8. A device for removing rust from the surface of section steel according to claim 2, characterized in that: The housing (2) and the round cover (51) are connected via a rectangular shell (21), and the output shaft (52) is located inside the rectangular shell (21).

9. A device for removing rust from the surface of section steel according to claim 1, characterized in that: The outer shell (71) and the bottom cover (74) are connected via a plurality of brackets (741), and the height of the bottom cover (74) is equal to the height of the grinding disc (4).

10. A method for removing rust from the surface of a steel section, the method using a device for removing rust from the surface of a steel section as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1: placing the grinder on the surface of the steel material, pulling the moving rod (83) on the bottom clamping assembly (8), the two moving rods (83) respectively move outwards and compress the second spring (822) inside, then releasing the moving rod (83), the two moving rods (83) move inwards by the elastic potential energy of the second spring (822), the rollers (831) on the moving rod (83) contact the two sides of the steel material, and clamp the steel material; S2: starting the motor (3), the motor (3) rotates to drive the output shaft (52) to rotate, the output shaft (52) drives the first bevel gear (53) to rotate, and the power is transmitted to the second bevel gear (54), the second bevel gear (54) drives the transmission shaft (72) to rotate, and drives the rust removal brush (6) on the grinding disc (4) to rotate, so as to grind and remove the rust on the surface of the steel; S3: The transmission shaft (72) rotates to drive the rotating blades (73) to rotate. The rotating blades (73) draw in external air and absorb the polished rust residue and smoke into the interior of the housing (71), and then enter the interior of the collection box (75) through the connecting pipe (76) on the housing (71); S4: The adsorbed rust residue and smoke enter the interior of the collection box (75), and are filtered by the first sieve (751), the second sieve (752), and the third sieve (753). Large particles of rust residue are filtered by the first sieve (751), and small particles of smoke are filtered and removed by the second sieve (752) and the third sieve (753). The remaining air is discharged from the third sieve (753).

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