A building steel structure end face grinding device and a method for using the same

Abstract

This invention relates to the field of steel structure processing, specifically to a grinding device for the end face of a steel structure and its usage method. Metal chips generated during grinding gradually clog the pores on the surface of the grinding tool, leading to abrasive passivation and a significant decrease in grinding capacity. To ensure processing quality, operators need to frequently stop the machine to clean or replace the grinding tools, affecting the efficiency of automated continuous production. This invention relates to a grinding device for the end face of a steel structure, including a metal chip shaking component, which can apply intermittent impact shaking to the grinding strip during grinding. The instantaneous acceleration generated by the shaking effectively overcomes the adhesion between the grinding chip layer and the abrasive grains, breaking and shaking off the already dulled metal chip layer and the passivated abrasive grains.

Description

Technical Field

[0001] This invention relates to the field of steel structure processing, specifically to a grinding device for the end face of a building steel structure and its usage method. Background Technology

[0002] In the field of steel structure and metal pipe processing, the end faces of tubular components (such as steel pipes, round pipes, square pipes, etc.) often need to be chamfered or beveled at a certain angle to facilitate subsequent welding connections or assembly. The surface quality and precision of this chamfered surface directly affect the strength of the welded joint and the reliability of the assembly. Currently, the grinding process for chamfering the end faces of tubular components mainly employs the following methods:

[0003] One method is manual grinding with a handheld angle grinder, which has the disadvantages of low efficiency, poor quality consistency, high labor intensity, and dust hazards to health.

[0004] Secondly, specialized grinding equipment, such as pipe end grinders or chamfering machines, is used. These machines typically use a chuck to hold the pipe and rotate it, while the grinding tool (such as a grinding wheel, belt, or abrasive strip) is fed axially to meet and grind the chamfered surface, which improves processing efficiency and accuracy to a certain extent.

[0005] However, the aforementioned specialized equipment generally faces a problem in continuous grinding: the metal chips generated during grinding gradually clog the pores on the surface of the grinding tool, leading to abrasive passivation and a significant decrease in grinding capacity. To ensure processing quality, operators need to frequently stop the machine to clean or replace the grinding tools, which affects the efficiency of automated continuous production. Summary of the Invention

[0006] The purpose of this invention is to provide a grinding device for the end face of a steel structure and its method of use, in order to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: A grinding device for the end face of a steel structure, comprising a grinding table, wherein the grinding table is provided with an adjusting support rod coaxially arranged with a three-jaw chuck holding the tubular component to be processed, the adjusting support rod being slidably connected to the grinding table in the horizontal direction, and having a plurality of grinding frames evenly distributed on its outer circumference for grinding the tubular component in a rotating state, wherein a bearing bracket is fixedly provided on the grinding table corresponding to each grinding frame, and both ends of the grinding frame being hinged to the outer wall of the adjusting support rod and the outer wall of the bearing bracket, respectively, and a removable and replaceable grinding strip is embedded on the grinding surface of the grinding frame facing the tubular component.

[0007] Preferably, a fixed pin is fixedly installed on the support bracket, and the grinding frame rotates around the fixed pin. A metal chip shaking component is installed on the support bracket with the fixed pin as the center. The metal chip shaking component includes a fixed chuck embedded in the support bracket. An annular groove is opened inside the fixed chuck, and a rotating disk is rotatably connected in the annular groove. A rotating frame is also rotatably connected at the axis of the fixed chuck, and a connecting spring is provided between the opposite end faces of the rotating frame and the rotating disk.

[0008] Preferably, a snap-fit ​​groove is formed on the outer circumferential wall of the rotating disk, and a plurality of sliding slots are formed at equal intervals along its circumference on the fixed chuck. A snap-fit ​​bracket is slidably connected in each sliding slot. A compression spring is provided between the snap-fit ​​bracket and the sliding slot. The end of the snap-fit ​​bracket is constructed as a wedge-shaped locking block. One of the snap-fit ​​grooves on the rotating disk is selected to form a snap-fit ​​engagement with the wedge-shaped locking block at the end of one of the snap-fit ​​brackets.

[0009] Preferably, the end of the rotating frame is provided with an abutting wedge, and the outer circumferential wall of the rotating disk located in the annular groove is also provided with protrusions continuously distributed in the circumferential direction. The outer wall of the fixed chuck is provided with an abutting rod that is elastically telescopically arranged perpendicular to its axis, and the two ends of the abutting rod contact the protrusions and the back of the grinding strip, respectively.

[0010] Preferably, a movable clamping plate is slidably connected to the inner wall of the grinding frame near the fixed pin, and movable rollers are provided on both side end walls of the movable clamping plate. The grinding frame is provided with vertical guide grooves that cooperate with the movable rollers in rolling motion, and the bearing bracket is provided with arc-shaped guide grooves that cooperate with the movable rollers in rolling motion.

[0011] Preferably, a central connecting rod is rotatably connected to the inner wall of the grinding frame, an angle adjustment frame is fixedly connected to the central connecting rod, an adjustment guide groove is provided on the movable chuck, the end of the angle adjustment frame extends into the adjustment guide groove and rolls with it, and the central connecting rod extends toward the axis of the fixed chuck and is fixedly connected to the rotating frame by a shaft connection.

[0012] Preferably, the grinding table is provided with a lead screw slide, and the adjusting support rod is connected to the output end of the lead screw slide.

[0013] Preferably, the method of using the aforementioned steel structure end face grinding device includes the following steps:

[0014] S1: Clamp the tubular part to be processed with a three-jaw chuck and align its end face with the fixed pin. Drive the adjusting support rod to move axially and push each grinding head to rotate synchronously around its own fixed pin until the grinding bar is tightly attached to the chamfered surface at the end of the tubular part. Start the three-jaw chuck to drive the tubular part to rotate for grinding.

[0015] S2: As the grinding process proceeds, the drive adjustment support rod continues to feed slightly, causing the grinding frame to generate a small angular displacement around the fixed pin. When the small displacement moves along the inner wall of the grinding frame through the moving plate, it is linearly amplified by the arc of the arc guide groove, driving the rotating frame to rotate and stretching the connecting spring to store elastic potential energy.

[0016] S3: When the rotating frame rotates to the point where the abutting wedge block at its end contacts the wedge block in the locked state, the abutting wedge block forces the wedge block to disengage from the locking groove, and the stretched connecting spring instantly retracts, driving the rotating disk to rotate rapidly by one step angle until the locking groove re-engages and locks with the next adjacent wedge block.

[0017] S4: During the rapid rotation of the rotary disk, the continuous protrusions on its outer circumferential wall collide with the inner end of the abutment rod in turn, forcing the abutment rod to produce axial extension and retraction, transmitting intermittent impact vibration to the grinding bar, causing the grinding bar to vibrate violently, so as to shake off the metal chips and passivated abrasive layer attached to it.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In this invention, a metal chip shaking component is installed on the support bracket with a fixed pin as the center. This component can apply intermittent impact shaking to the grinding bar during the grinding process. The instantaneous acceleration generated by the shaking can effectively overcome the adhesion between the grinding chip layer and the abrasive grains, breaking and shaking off the dulled metal chip layer and passivated abrasive grains, exposing fresh abrasive particles. This achieves self-sharpening and cleaning of the grinding bar, avoids the decrease in grinding efficiency caused by grinding chip clogging, extends the service life of the grinding bar per cycle, and reduces the frequency of downtime for replacing the grinding bar.

[0020] In this invention, a movable clamping plate is provided on the inner wall of the grinding frame near the fixed pin. The movable rollers on both sides of the movable clamping plate simultaneously roll in cooperation with the vertical guide groove on the grinding frame and the arc-shaped guide groove on the support bracket. Since the radius of curvature of the arc-shaped guide groove is much larger than the rotation radius of the angular displacement of the grinding frame, the rolling stroke of the movable rollers in the arc-shaped guide groove is extended, converting the angular displacement of the grinding frame into a linear displacement amplified by the movable clamping plate along the inner wall of the grinding frame. By adjusting the cooperation between the guide groove and the angle adjustment frame, the central connecting rod is driven to rotate, ensuring a small amount of feed adjustment and reliably triggering the action of the metal chip shaking component.

[0021] In this invention, the metal chip shaking component employs a structure in which a rotating disk locking slot alternately engages with multiple circumferentially distributed locking frames. Each time the rotating disk is triggered, it advances only one locking slot position, corresponding to one shaking action. Subsequently, it immediately re-engages and locks with the adjacent locking frame. The stepping structure ensures that the shaking action occurs periodically and in a single manner, avoiding interference from the normal grinding process caused by the free rotation or continuous shaking of the rotating disk. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the grinding table used in the present invention for grinding tubular parts;

[0023] Figure 2 This is a three-dimensional side view of the grinding table used in the present invention for grinding tubular parts.

[0024] Figure 3 This is a side view of the grinding table in this invention, which has a metal chip removal assembly on one side.

[0025] Figure 4 This is a side view of the grinding table away from the metal chip removal assembly in this invention;

[0026] Figure 5 This is a three-dimensional structural diagram of the support bracket and metal chip shaking component in the disassembled state of the present invention.

[0027] Figure 6 This is a front view of the metal chip shaking component in this invention;

[0028] Figure 7 This is a three-dimensional structural diagram of the metal chip shaking component in this invention;

[0029] Figure 8 This is a schematic diagram of the fixed chuck and rotating disk in the disassembly state of the metal chip shaking assembly of the present invention;

[0030] Figure 9 This is a state diagram of the initial docking state of the rotating disk and the snap-fit ​​bracket in this invention;

[0031] Figure 10 This is a schematic diagram showing the rotating frame in the rotating process and the spring connected to the rotating disk under tension.

[0032] Figure 11 This is a schematic diagram showing the engagement state between the locking groove on the rotating disk and the adjacent wedge-shaped locking block in this invention;

[0033] Figure 12 This is a three-dimensional sectional view of the grinding frame structure in this invention;

[0034] Figure 13 This is a schematic diagram of the movable card plate and the central connecting rod in this invention.

[0035] In the diagram: 1. Grinding table; 11. Adjusting support rod; 12. Grinding frame; 13. Grinding bar; 14. Bearing bracket; 15. Fixed pin; 2. Metal chip shaking assembly; 21. Fixed chuck; 22. Annular groove; 23. Rotary disk; 24. Snap-fit ​​groove; 25. Rotating frame; 26. Connecting spring; 27. Sliding groove; 28. Snap-fit ​​frame; 29. ​​Compression spring; 210. Wedge-shaped block; 211. Abutting wedge; 212. Protrusion; 213. Abutting rod; 3. Moving plate; 31. Moving roller; 32. Vertical guide groove; 33. Arc-shaped guide groove; 34. Central connecting rod; 35. Angle adjustment frame; 36. Adjusting guide groove; 4. Lead screw slide. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example

[0038] Please see Figures 1 to 13 This invention provides a technical solution: a steel structure end face grinding device for houses, including a grinding table 1 suitable for the end face corner grinding process of metal pipes. The grinding table 1 is provided with an adjusting support rod 11 coaxially arranged with a three-jaw chuck that holds the tubular part to be processed. The adjusting support rod 11 is slidably connected to the grinding table 1 in the horizontal direction, and multiple grinding frames 12 for grinding the tubular part in a rotating state are evenly distributed on its outer circumference. A bearing bracket 14 is fixedly provided on the grinding table 1 for each grinding frame 12. The two ends of the grinding frame 12 are respectively hinged to the outer wall of the adjusting support rod 11 and the outer wall of the bearing bracket 14 to form a linkage angle adjustment. A removable and replaceable grinding strip 13 is embedded on the grinding surface of the grinding frame 12 facing the tubular part.

[0039] A fixed pin 15 is fixedly installed on the support bracket 14. The grinding frame 12 can rotate around the fixed pin 15 as the pivot point to adjust its tilt angle so that the grinding strip 13 fits the chamfered surface at different angles. A metal chip shaking component 2 is installed on the support bracket 14 with the fixed pin 15 as the center. The metal chip shaking component 2 is used to intermittently apply impact vibration to the grinding strip 13 when the grinding strip 13 is grinding the chamfered part of the tubular part to shake off the metal chips and passivated abrasive layer attached thereto.

[0040] The tubular part to be processed is clamped by a three-jaw chuck, and the end face of the tubular part is aligned with the position of the fixed pin 15. The adjusting support rod 11 is driven to move axially, pushing each grinding frame 12 to rotate synchronously around its respective fixed pin 15 until the grinding bar 13 is tightly attached to the chamfered surface of the end of the tubular part. Driven by the three-jaw chuck, the tubular part is rotated to perform grinding.

[0041] Specifically, the metal chip shaking assembly 2 includes a fixed chuck 21 embedded in a support bracket 14. An annular groove 22 is formed inside the fixed chuck 21, and a rotating disk 23 is rotatably connected within the annular groove 22. A rotating frame 25 is also rotatably connected to the axis of the fixed chuck 21. A connecting spring 26 is provided between the opposite end faces of the rotating frame 25 and the rotating disk 23. The connecting spring 26 stores elastic potential energy when the two rotate relative to each other. A locking groove 24 is formed on the outer circumferential wall of the rotating disk 23. The upper edge of the fixed chuck 21... The rotating disk 23 has several sliding slots 27 evenly spaced around its circumference. Each sliding slot 27 is slidably connected to a locking bracket 28. A compression spring 29 is provided between the locking bracket 28 and the sliding slot 27. The compression spring 29 makes the locking bracket 28 always tend to move towards the outer circumferential wall of the rotating disk 23. The end of the locking bracket 28 is constructed as a wedge-shaped locking block 210. One of the locking slots 24 on the rotating disk 23 is selected to engage with the wedge-shaped locking block 210 at the end of one of the locking brackets 28 to lock the rotation position of the rotating disk 23.

[0042] Furthermore, the end of the rotating frame 25 is provided with an abutting wedge block 211. When the rotating frame 25 rotates around the axis, the abutting wedge block 211 can contact the wedge-shaped locking block 210 in the locking state and push it to overcome the elastic force of the compression spring 29 and disengage from the locking groove 24. The outer circumferential wall of the rotating disk 23 located in the annular groove 22 is also provided with protrusions 212 continuously distributed along the circumference. The outer wall of the fixed chuck 21 is provided with an abutting rod 213 elastically telescopically arranged perpendicular to its axis. The two ends of the abutting rod 213 contact the protrusion 212 and the back of the grinding strip 13 respectively, and are used to transmit the radial displacement generated by the protrusion 212 when the rotating disk 23 rotates to the grinding strip 13, thereby causing the grinding strip 13 to vibrate rapidly.

[0043] The three-jaw chuck is activated to drive the tubular component to rotate at high speed. The grinding bar 13 performs circumferential grinding on the rotating chamfered surface while it is stationary. When the rotating frame 25 rotates, the rotating disk 23 is initially locked in the locking groove 24 by the wedge-shaped locking block 210 of one of the locking frames 28, so the rotating disk 23 remains stationary. Meanwhile, the rotating frame 25 gradually stretches the connecting spring 26 to store energy. When the rotating frame 25 rotates to the point where the abutting block 211 at its end contacts the locked wedge-shaped locking block 210, the abutting block 211 forces the locking frame 28 to overcome the elastic force of the compression spring 29 and retract. The wedge-shaped locking block 210 separates from the locking groove 24 instantly, and the stretched connecting spring 26 quickly retracts, driving the rotating disk 23 to rotate rapidly by one step angle until the locking groove 24 re-engages and locks with the wedge-shaped locking block 210 on the next adjacent locking frame 28.

[0044] During the rapid rotation of the rotating disk 23, the continuous protrusions 212 on its outer circumferential wall collide with the inner end of the abutment rod 213 in sequence, forcing the abutment rod 213 to extend and retract along its axial direction. The abutment rod 213 and the back of the grinding strip 13 are in elastic contact, and a spring is provided inside to maintain continuous contact, thereby directly transmitting the impact vibration to the grinding strip 13, causing the grinding strip 13 to produce a violent intermittent vibration. Since the abrasive layer of the grinding strip 13 is formed by the stacking and solidification of multiple layers of abrasive grains, the instantaneous acceleration generated by this vibration overcomes the adhesion force between the abrasive layer and the abrasive grains, thereby breaking and shaking off the dull metal shavings and passivated abrasive grains on the surface, exposing fresh abrasive particles, and realizing the self-sharpening and cleaning of the grinding strip 13.

[0045] In this embodiment, in order to amplify the small angular displacement of the grinding frame 12 and drive the rotating frame 25 to rotate, a movable clamping plate 3 is slidably connected to the inner wall of the grinding frame 12 near the fixed pin 15. Movable rollers 31 are provided on both side end walls of the movable clamping plate 3. A vertical guide groove 32 is provided on the grinding frame 12 to roll with the movable rollers 31. An arc-shaped guide groove 33 is provided on the bearing bracket 14 to roll with the movable rollers 31. A central connecting rod 34 is also rotatably connected to the inner wall of the grinding frame 12. An angle adjustment frame 35 is fixedly connected to the central connecting rod 34. An adjustment guide groove 36 is provided on the movable clamping plate 3. The end of the angle adjustment frame 35 extends into the adjustment guide groove 36 and rolls with it. The central connecting rod 34 extends toward the axis of the fixed chuck 21 and is fixedly connected to the rotating frame 25 by a shaft connection, thereby transmitting the rotational motion of the central connecting rod 34 to the rotating frame 25.

[0046] The three-jaw chuck drives the tubular component to rotate at high speed. As the grinding process proceeds, metal chips gradually adhere to the surface of the grinding strip 13 and become passivated. At this time, by adjusting the support rod 11, a small amount of feed is continued, causing a small angular displacement of the tilt angle of the grinding frame 12 to adapt to different chamfer angles or compensate for the wear of the grinding strip 13. The small angular displacement forces the moving roller 31 to drive the moving chuck 3 to produce an amplified linear displacement along the inner wall of the grinding frame 12 under the guidance of the arc-shaped guide groove 33. The adjustment guide groove 36 on the moving chuck 3 then drives the angle adjustment frame 35 to deflect, which in turn drives the central connecting rod 34 to rotate. After being amplified and transmitted by the moving chuck 3 and the central connecting rod 34, the angular displacement drives the rotating frame 25 to rotate around the axis of the fixed chuck 21.

[0047] After the rotating disk 23 re-engages and locks with the adjacent locking frame 28, the rotating disk 23 returns to a stationary state, while the rotating frame 25 continues to rotate under the continuous drive of the central connecting rod 34, stretching the connecting spring 26 again for the next round of energy storage. With the continuous feeding of the adjusting support rod 11, periodic repetition is achieved. Each round of stepping corresponds to one self-sharpening cleaning of the grinding strip 13, forming a sustainable intermittent self-cleaning.

[0048] In this embodiment, a lead screw slide 4 is provided on the grinding table 1, and the adjusting support rod 11 is connected to the output end of the lead screw slide 4;

[0049] The lead screw slide 4 drives the adjustment support rod 11 to slowly move linearly along its axis, thereby gradually changing the tilt angle of each grinding frame 12 to ensure the stability of the contact pressure between the grinding bar 13 and the chamfered surface during the grinding of the tubular part. After the tubular part is processed, the operator can disassemble the tubular part and adjust each component to its initial state for subsequent use.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grinding device for the end face of a steel structure for housing, comprising a grinding table (1) suitable for the corner grinding process of metal pipe end face cutting, characterized in that, Also includes: Adjustable support rod (11) is slidably connected to the grinding table (1) in the horizontal direction and is coaxially set with the three-jaw chuck that holds the tubular part to be processed; Multiple grinding frames (12) are evenly distributed on the outer circumferential surface of the adjusting support rod (11), and each grinding frame (12) has a removable and replaceable grinding strip (13) embedded on the grinding surface facing the tubular part. The support bracket (14) is fixedly installed on the grinding table (1) and corresponds to the position of each grinding frame (12). The two ends of the grinding frame (12) are respectively hinged to the outer wall of the adjusting support rod (11) and the outer wall of the support bracket (14). A fixed pin (15) is fixedly mounted on the bearing bracket (14). The grinding frame (12) uses the fixed pin (15) as a pivot point for rotation and is used to rotate around it to adjust its tilt angle. The metal chip shaking assembly (2) is set on the bearing bracket (14) with the fixed pin (15) as the center, and is used to intermittently apply impact vibration to the grinding bar (13) during grinding.

2. The grinding device for the end face of a steel structure of a building according to claim 1, characterized in that: The metal chip shaking assembly (2) includes: A fixed chuck (21) is fitted onto the support bracket (14); An annular groove (22) is formed inside the fixed chuck (21); The rotating disk (23) is rotatably connected to the annular groove (22); The rotating frame (25) is rotatably connected to the axis of the fixed chuck (21); A connecting spring (26) is disposed between the opposite end faces of the rotating frame (25) and the rotating disk (23) to store elastic potential energy when the two rotate relative to each other; A snap-fit ​​groove (24) is formed on the outer circumferential wall of the rotating disk (23); Multiple sliding slots (27) are equally spaced along the circumference of the fixed chuck (21); The snap-fit ​​bracket (28) is slidably connected in each of the sliding snap-fit ​​slots (27), and its end is constructed as a wedge-shaped snap-fit ​​block (210). The snap-fit ​​slot (24) is selected to engage with one of the wedge-shaped snap-fit ​​blocks (210) to lock the rotation position of the rotating disk (23). A compression spring (29) is disposed between each of the snap-fit ​​brackets (28) and the corresponding sliding slot (27) to ensure that the snap-fit ​​brackets (28) always tend to move toward the outer circumferential wall of the rotating disk (23); An abutting wedge (211) is provided at the end of the rotating frame (25) for contacting the wedge-shaped locking block (210) in the locking state during rotation and pushing it away from the locking groove (24).

3. The grinding device for the end face of a steel structure of a building according to claim 2, characterized in that: The metal chip shaking assembly (2) further includes: Multiple protrusions (212) are continuously distributed circumferentially on the outer circumferential wall of the rotating disk (23) located in the annular groove (22); The abutment rod (213) is elastically telescopically disposed on the outer wall of the fixed chuck (21) in a direction perpendicular to the axis of the fixed chuck (21). Its two ends contact the back of the protrusion (212) and the grinding strip (13) respectively, and are used to transmit the radial displacement generated by the protrusion (212) when the rotating disk (23) rotates to the grinding strip (13).

4. The steel structure end face grinding device according to claim 3, characterized in that: The grinding frame (12) is also provided with a movable clamping plate (3) on the inner wall near the fixed pin (15); Movable rollers (31) are disposed on the two end walls of the movable plate (3); A vertical guide groove (32) is provided on the grinding frame (12) and rolls in cooperation with the moving roller (31); An arc-shaped guide groove (33) is provided on the bearing bracket (14) and rolls in cooperation with the moving roller (31).

5. The steel structure end face grinding device according to claim 4, characterized in that: The central connecting rod (34) is rotatably connected to the inner wall of the grinding frame (12), and one end of it extends toward the axis of the fixed chuck (21) and is fixedly connected to the rotating frame (25). An angle adjustment bracket (35) is fixedly connected to the central connecting rod (34); An adjustment guide groove (36) is provided on the movable plate (3), and the end of the angle adjustment bracket (35) extends into the adjustment guide groove (36) and rolls with it; The linear displacement of the movable plate (3) can drive the angle adjustment frame (35) to deflect through the adjustment guide groove (36), thereby driving the central connecting rod (34) to rotate.

6. The grinding device for the end face of a steel structure of a building according to claim 5, characterized in that: Under the guidance of the arc-shaped guide groove (33), the moving roller (31) converts the small angular displacement of the grinding frame (12) around the fixed pin (15) into an amplified linear displacement of the moving plate (3) along the inner wall of the grinding frame (12).

7. The grinding device for the end face of a steel structure of a building according to claim 5, characterized in that: The grinding table (1) is provided with a lead screw slide (4), and the adjusting support rod (11) is connected to the output end of the lead screw slide (4) to drive the adjusting support rod (11) to make a slow linear displacement along its axis, so as to change the tilt angle of each grinding frame (12).

8. A method of using a steel structure end face grinding device for buildings, comprising using the steel structure end face grinding device as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Clamp the tubular part to be processed with a three-jaw chuck and align its end face with the fixed pin (15). Drive the adjusting support rod (11) to move axially and push each grinding frame (12) to rotate synchronously around its own fixed pin (15) until the grinding bar (13) is tightly attached to the chamfered surface of the end of the tubular part. Start the three-jaw chuck to drive the tubular part to rotate for grinding. S2: As the grinding process proceeds, the drive adjustment support rod (11) continues to feed slightly, causing the grinding frame (12) to generate a small angular displacement around the fixed pin (15). When the small displacement moves along the inner wall of the grinding frame (12) through the moving plate (3), it is linearly amplified by the arc of the arc guide groove (33), driving the rotating frame (25) to rotate and stretch the connecting spring (26) to store elastic potential energy. S3: When the rotating frame (25) rotates to the point where the abutting wedge (211) at its end contacts the wedge-shaped locking block (210) in the locked state, the abutting wedge (211) forces the wedge-shaped locking block (210) to disengage from the locking groove (24), and the stretched connecting spring (26) instantly retracts, driving the rotating disk (23) to rotate rapidly by one step angle until the locking groove (24) re-engages and locks with the next adjacent wedge-shaped locking block (210); S4: During the rapid rotation of the rotating disk (23), the continuous protrusions (212) on its outer circumferential wall collide with the inner end of the abutment rod (213) in turn, forcing the abutment rod (213) to generate axial extension and retraction, transmitting intermittent impact vibration to the grinding bar (13), causing the grinding bar (13) to vibrate violently, so as to shake off the metal chips and passivated abrasive layer attached to it.

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