On-site polishing device for steel structure factory building construction

Abstract

The on-site polishing device comprises an operation table and a supporting frame, an electric extension rod is installed on the surface of the supporting frame, a vertical plate is inserted into the power end of the electric extension rod, and a round rod is fixedly installed on the surface of the other side of the vertical plate; the surface of the round rod is rotationally sleeved with a first circular ring piece and a second circular ring piece, second electric push rods are installed on the surfaces of the first circular ring piece and the second circular ring piece, one output end of the double-end motor is connected with a grinding roller, and the surfaces of the first circular ring piece and the second circular ring piece are fixedly sleeved with a second gear and a third gear correspondingly. The output end of the first motor is connected with a long rod, a fifth electric push rod is installed on the surface of the other side of the vertical plate, the power end of the fifth electric push rod is connected with a push rack, and push assemblies are installed on the surfaces of the fixed ends of the two second electric push rods correspondingly, so that efficient multi-face grinding and differential adjustment are both considered, and the grinding quality and efficiency are guaranteed.

Description

Technical Field

[0001] The present invention relates to a steel structure grinding device, in particular to a on-site grinding device for the construction of a steel structure factory building applied to the field of steel structure grinding. Background Art

[0002] During the construction of a steel structure factory building, it is inevitable to involve the grinding and processing operation of steel structures. In the prior art, it is usually designed to use hand-held instruments for grinding or use machinery for grinding operations. The hand-held grinding operation has low efficiency, while the mechanical grinding operation has high efficiency but lacks maneuverability for adjustment, so the grinding device needs to be improved accordingly.

[0003] The specification of Chinese invention patent CN117140303B discloses a grinding device for steel structure production. When performing grinding operations, two upper and lower grinding rollers that move synchronously are used for double-sided grinding operations, which improves the grinding efficiency.

[0004] The specification of Chinese invention patent CN118143827B discloses a grinding machine applied to the processing of steel structure parts, which solves the problem that traditional grinding tools are mainly used for single-sided grinding in many cases, and it is difficult to achieve effective multi-sided grinding of steel components, thus greatly reducing the grinding efficiency of steel structures.

[0005] When the existing grinding equipment performs grinding operations, although it can achieve multi-sided synchronous grinding treatment to improve the grinding efficiency, this is based on the consistent grinding state of each grinding surface. In actual operation, the grinding states between each grinding surface are not consistent. It is possible that the grinding time required for a certain area on a certain grinding surface is significantly longer than other areas. At this time, the multi-sided grinding structure that moves synchronously needs to stay synchronously, which will cause unnecessary stops in the grinding operations of other grinding surfaces, and to a certain extent, reduces the grinding efficiency. Summary of the Invention

[0006] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is how to balance the high efficiency of multi-sided grinding and differential adjustment during the grinding operation of steel structures, and ensure the grinding quality and efficiency.

[0007] To solve the above problems, the present invention provides a on-site grinding device for the construction of steel structure workshops, which includes an operating table and a support frame with a lifting cylinder arranged on one side of the operating table. An electric telescopic rod is installed on the surface of the support frame, and a vertical plate is inserted into the power end of the electric telescopic rod. One side surface of the vertical plate is connected with a first motor, and the other side surface of the vertical plate is fixedly installed with a round rod. A first ring member and a second ring member are rotatably sleeved on the surface of the round rod, and the second ring member is located between the first ring member and the vertical plate. Second electric push rods arranged back to back are installed on the surfaces of the first ring member and the second ring member through movable components. The movable end surface of the second electric push rod is connected with a double-headed motor, and one of the output ends of the double-headed motor is connected with a grinding roller. Second gears and third gears are fixedly sleeved on the surfaces of the first ring member and the second ring member respectively. The output end of the first motor is connected with a long rod, and a first gear meshing with the second gear is connected to the surface of the long rod. A fifth electric push rod is installed on the other side surface of the vertical plate through a bracket, and a pushing rack meshing with the third gear is connected to the power end of the fifth electric push rod. Pushing components for horizontally pushing to assist the grinding roller are installed on the surfaces of the fixed ends of the two second electric push rods.

[0008] In the above on-site grinding device for the construction of steel structure workshops, the first motor drives the gear set to drive the first ring member to rotate. The fifth electric push rod controls the third gear through the pushing rack, so that the two grinding rollers can move synchronously or asynchronously to meet the differential grinding requirements of the inner and outer walls of the round pipe, thereby taking into account the high efficiency of multi-faceted grinding and differential adjustment, and ensuring the grinding quality and efficiency.

[0009] As a further improvement of the present application, the pushing component includes an extension plate installed on the surface of the fixed end of the second electric push rod. A third motor is installed on one side surface of the extension plate, and a rotating plate connected to the output end of the third motor is attached to the other side surface of the extension plate. A fourth electric push rod with a movable end connected with a rubber roller is installed on the side surface of the rotating plate facing away from the extension plate.

[0010] As a further improvement of the present application, the extension plate and the rotating plate in each pushing component are in a straight-line placement state, and the projected length value when the extension plate and the rotating plate on the surface of the second electric push rod on the surface of the first ring member are in a straight-line placement is less than the length value of the fixed end of the second electric push rod.

[0011] As a further improvement of the present application, the other output end of the double-headed motor is connected to the movable end surface of the second electric push rod. The movable component includes an inner groove provided at the bottom of the fixed end of the second electric push rod. An electromagnetic block is fixed on the top wall of the inner groove, and a magnetic moving plug-in is slidably connected inside the inner groove. Plugging grooves matching the magnetic moving plug-in are provided on the surfaces of the first ring member and the second ring member.

[0012] As a further improvement of the present application, the depth value of the insertion slot is less than the height value of the magnetic drive plug-in, and the depth values of both insertion slots are less than the thickness values of the first ring member and the second ring member.

[0013] As a further improvement of the present application, a second motor is installed on the side surface of the operating table. The output end of the second motor is connected to a bidirectional screw. A moving block is threadedly sleeved on the surface of the bidirectional screw. A first electric push rod slidably connected to the inside of the operating table is installed on the surface of the moving block. The power end of the first electric push rod is connected to a clamping plate, and an anti-slip pad is installed on the surface of the clamping plate.

[0014] As a further improvement of the present application, the length value of the rotating plate is greater than the distance value between the contact end of the grinding roller and the double-headed motor to the surface of the second electric push rod in the horizontal state.

[0015] As another improvement of the present application, a supplementary motor is installed inside the extension plate. The output end of the supplementary motor is connected to an insertion block, and the insertion block is inserted and connected to the surface of the second electric push rod. The output end of the double-headed motor is inserted and connected to the surface of the power end of the second electric push rod. A notch matching the power end of the electric extension rod is provided at the power end of the second electric push rod.

[0016] As a supplement to another improvement of the present application, the projection of the notch is located within the effective area of the double-headed motor, and the projection of the notch deviates from the area where the output end of the double-headed motor is located.

[0017] In summary, the first motor drives the gear set to drive the first ring member to rotate. The fifth electric push rod controls the third gear by pushing the rack, so that the two grinding rollers can move synchronously or asynchronously to meet the differential grinding requirements of the inner and outer walls of the round tube. The movable assembly can realize the quick locking and separation of the second electric push rod from the first ring member and the second ring member, facilitating the switching between the rotary grinding and linear propulsion modes. The pushing assembly adjusts the angle of the rotating plate through the third motor, and cooperates with the rubber roller of the fourth electric push rod to form a supporting reaction force to ensure the stability of the square tube grinding. While the double-headed motor drives the grinding roller to rotate, it can also drive the second electric push rod to rotate horizontally. For special-shaped cross-sections, the gear meshing mechanism can adjust the angle difference between the two grinding rollers. The design of the supplementary motor and the insertion block expands the grinding range outside the square tube. The power end of the electric extension rod is inserted into the notch of the second electric push rod to achieve circumferential swinging grinding, so as to take into account the efficiency of multi-faceted grinding and differential adjustment, and ensure the grinding quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the first embodiment of the present application; Figure 2 is a schematic diagram of the installation of the clamping plate and the moving block of the first embodiment of the present application; Figure 3 is for the present application Figure 2 The enlarged schematic diagram at A in Figure 4 Schematic diagram of the installation of the driving component in the first embodiment of the present application; Figure 5 For the present application Figure 4 Enlarged schematic diagram at position B in; Figure 6 Schematic diagram of the installation of the movable component in the first embodiment of the present application; Figure 7 State diagram of the synchronous movement of the two grinding rollers when grinding the inner side of the round pipe in the first embodiment of the present application; Figure 8 State diagram of the asynchronous rotation of the two grinding rollers due to different grinding states when grinding the inner side of the round pipe in the first embodiment of the present application; Figure 9 State diagram of the flat pushing of the two grinding rollers by the driving component when grinding the inner side of the square pipe in the first embodiment of the present application; Figure 10 State diagram of the flat pushing of the two grinding rollers by the driving component when grinding the outer side of the square pipe in the first embodiment of the present application; Figure 11 State diagram of the two grinding rollers after adjusting the included angle for grinding the triangular pipe body in the first embodiment of the present application; Figure 12 Diagram of the pressing contact with the inner side of the pipe using the telescopic rod in the first embodiment of the present application; Figure 13 Schematic diagram of the notch on the surface of the second electric push rod in the second embodiment of the present application; Figure 14 Schematic diagram of the installation of the supplementary motor in the second embodiment of the present application; Figure 15 State diagram of moving along the edge of the pipe body when grinding the outer side of the square pipe in the second embodiment of the present application; Figure 16 State diagram of moving the grinding roller axially when grinding the outer side of the round pipe in the second embodiment of the present application.

[0019] Explanation of the reference numerals in the figure: 1. Operating table; 2. Electric telescopic rod; 3. First motor; 4. Vertical plate; 5. Second motor; 6. First electric push rod; 7. Clamping plate; 8. Double-headed motor; 9. Grinding roller; 10. First gear; 11. Second electric push rod; 12. Second gear; 13. First ring part; 14. Third gear; 15. Driving rack; 16. Second ring part; 17. Extension plate; 18. Third motor; 19. Rotating plate; 20. Fourth electric push rod; 102. Fifth electric push rod; 1101. Electromagnetic block; 1102. Magnetic moving plug-in. Specific embodiments

[0020] The following will give a detailed description of two implementation manners of the present application in conjunction with the accompanying drawings.

[0021] The first implementation manner: Figures 1 - 3 There is shown a on-site grinding device for the construction of a steel structure workshop, including an operation table 1 and a support frame with a lifting cylinder arranged on one side of the operation table 1. An electric telescopic rod 2 is installed on the surface of the support frame. The power end of the electric telescopic rod 2 is inserted with a vertical plate 4. One side surface of the vertical plate 4 is connected with a first motor 3. The other side surface of the vertical plate 4 is fixedly installed with a round rod. A first ring member 13 and a second ring member 16 are rotatably sleeved on the surface of the round rod, and the second ring member 16 is located between the first ring member 13 and the vertical plate 4. The surfaces of the first ring member 13 and the second ring member 16 are both installed with second electric push rods 11 arranged back to back through movable components. The movable end surface of the second electric push rod 11 is connected with a double-headed motor 8. One of the output ends of the double-headed motor 8 is connected with a grinding roller 9. Second gears 12 and third gears 14 are respectively fixedly sleeved on the surfaces of the first ring member 13 and the second ring member 16. The output end of the first motor 3 is connected with a long rod, and a first gear 10 meshing with the second gear 12 is connected to the surface of the long rod. A fifth electric push rod 102 is installed on the other side surface of the vertical plate 4 through a bracket, and a push rack 15 meshing with the third gear 14 is connected to the power end of the fifth electric push rod 102. The surfaces of the fixed ends of the two second electric push rods 11 are both installed with a pushing component for assisting the horizontal pushing of the grinding roller 9.

[0022] Figures 4 - 5 It is shown that the pushing component includes an extension plate 17 installed on the surface of the fixed end of the second electric push rod 11. A third motor 18 is installed on one side surface of the extension plate 17. A rotating plate 19 connected to the output end of the third motor 18 is attached to the other side surface of the extension plate 17. A fourth electric push rod 20 with a movable end connected with a rubber roller is installed on the side surface of the rotating plate 19 facing away from the extension plate 17.

[0023] The extension plate 17 and the rotating plate 19 in each pushing component are in a straight placement state. The projected length value when the extension plate 17 and the rotating plate 19 on the surface of the second electric push rod 11 on the first ring member 13 are in a straight placement is less than the length value of the fixed end of the second electric push rod 11.

[0024] Figure 6 It is shown that the other output end of the double-headed motor 8 is connected with the movable end surface of the second electric push rod 11. The movable component includes an inner groove provided at the bottom of the fixed end of the second electric push rod 11. An electromagnetic block 1101 is fixed on the top wall of the inner groove. A magnetic moving plug 1102 is slidably connected inside the inner groove. Plugging grooves matching with the magnetic moving plug 1102 are provided on the surfaces of the first ring member 13 and the second ring member 16.

[0025] The depth value of the insertion slot is less than the height value of the magnetic drive plug 1102, and the depth values of both insertion slots are less than the thickness values of the first ring member 13 and the second ring member 16.

[0026] Figures 1 - 2 As shown, a second motor 5 is installed on the side surface of the operating table 1. The output end of the second motor 5 is connected to a bidirectional screw rod. A moving block is threadedly sleeved on the surface of the bidirectional screw rod. A first electric push rod 6 slidably connected to the inside of the operating table 1 is installed on the surface of the moving block. The power end of the first electric push rod 6 is connected to a clamping plate 7, and an anti-slip pad is installed on the surface of the clamping plate 7.

[0027] The length value of the rotating plate 19 is greater than the distance value between the contact end of the grinding roller 9 and the double-headed motor 8 and the surface of the second electric push rod 11 in the horizontal state.

[0028] Specifically, when performing the grinding treatment on the steel structure, first place the steel structure on the surface of the operating table 1. According to the specific size of the steel structure, adjust the extension height of the first electric push rod 6 so that the two subsequent approaching clamping plates 7 can effectively clamp the steel structure. Then start the second motor 5 to drive the two first electric push rods 6 to approach each other, and further drive the two clamping plates 7 to approach each other.

[0029] When performing the grinding operation on the round pipe, after the round pipe is fixed, use the lifting cylinder to adjust so that the center of the round rod and the center of the round pipe are on the same axis. Then use the two vertically placed grinding rollers 9 and the two second electric push rods 11 to adjust the position of the grinding rollers 9 so that the surfaces of the two grinding rollers 9 are in contact with the inner wall of the round pipe. Then stop the height adjustment operation of the second electric push rod 11. Then start the first motor 3 and the fifth electric push rod 102 to drive the first gear 10, the second gear 12, and the third gear 14 to rotate, so as to drive the connected first ring member 13 and the second ring member 16 to rotate synchronously. In this way, when the grinding state in the round pipe is the same (as Figure 7 shown), the grinding roller 9 only needs to rotate half a week to complete all the grinding work inside the round pipe.

[0030] When the grinding state inside the round pipe is inconsistent, that is, when one of the grinding rollers 9 rotates around the round rod, the grinding time at a certain point is relatively long, and the grinding time required for the grinding area where the other grinding roller 9 is located is significantly lower than that of one of the grinding rollers 9. For the convenience of explanation, as Figure 8As shown, at this time, the grinding duration in the area where the grinding roller 9 is located on the surface of the first ring part 13 is relatively long. At this time, the first motor 3 at this position stops rotating, so the first gear 10 and the second gear 12 also stop rotating synchronously (during this process, there is a magnetic repulsion between the electromagnetic block 1101 and the magnetic moving plug-in 1102 to maintain the connection between the second electric push rod 11 and the first ring part 13 and the second ring part 16), driving the grinding roller 9 on the surface of the first ring part 13 to stop rotating around the circular tube and maintain the in-situ grinding state. To avoid reducing the overall grinding efficiency, at this time, the fifth electric push rod 102 does not stop moving, driving the third gear 14 to continue rotating, and then driving the grinding roller 9 on the surface of the second ring part 16 to continue rotating around the circular tube for dynamic grinding operation.

[0031] When performing the outer grinding operation of the circular tube, it is necessary to support and lift the inner side of the circular tube end. The telescopic rod can be used to lift the inner side of the circular tube after being in contact with it, and then the circular tube is lifted. This operation method is an existing technology, such as Figure 12 As shown, no more details will be given here, so that the following grinding roller 9 can fit to the bottom position below the circular tube, and then the grinding operation is carried out according to the above scheme.

[0032] When performing the inner grinding of the square tube, as Figure 9 shown, it is necessary to use two second electric push rods 11 to adjust the two grinding rollers 9 to fit the inner surface of the square tube. Then, the movable component is started, so that an attractive force is generated between the electromagnetic block 1101 and the magnetic moving plug-in 1102, causing the plug-in connection between the two second electric push rods 11 and the first ring part 13 and the second ring part 16 to disappear. Subsequently, the output end of the double-headed motor 8 connected to the second electric push rod 11 is started, driving the second electric push rod 11 to switch from the original vertical placement state to the horizontal placement state. And as the second electric push rod 11 rotates, the pushing component also rotates synchronously. Then, the third motor 18 is started, driving the rotating plate 19 to rotate 90 degrees. After that, the projection of the fourth electric push rod 20 is located inside the square tube because of the designed length value of the rotating plate 19. After rotating 90 degrees, the original fourth electric push rod 20 located outside the end of the square tube can be located inside the square tube. Then, the fourth electric push rod 20 is started until the rubber roller at the end of the fourth electric push rod 20 abuts against the inside of the square tube. Then, the second electric push rod 11 is started, driving the rotating grinding roller 9 to move horizontally inside the square tube for linear grinding operation.

[0033] Since in the initial position, the grinding roller 9 is located at the center position of the square tube, after the above operations, the grinding roller 9 can only grind half of the inner side length of the square tube. For the remaining half, after the second electric push rod 11 is reset to the center position of the square tube after half of the grinding is completed, the double-headed motor 8 drives the second electric push rod 11 to rotate 180 degrees, and then continues to abut and push flat to complete the single-sided linear grinding operation on the inner side of the square tube. When it is necessary to grind the other two inner surfaces of the square tube, the square tube can be rotated 90 degrees and then the above-mentioned grinding operation of the square tube can be continued.

[0034] When grinding the outer side of the square tube (as Figure 10 shown), the grinding operation on the inner side of the square tube is the same, except that the square tube needs to be lifted when being clamped so that the grinding roller 9 can be attached. After the pushing assembly rotates 90 degrees, since the extension plate 17 has a certain length, which is greater than the thickness of the square tube, the projection of the rotating plate 19 after rotating 90 degrees can be smoothly located inside the square tube to play a corresponding abutting role.

[0035] When grinding a steel structure pipe body with a special-shaped cross-section, such as a triangular one, by using the meshing of the second gear 12 with the first gear 10, the pushing rack 15 and the third gear 14, the angle difference between the two grinding rollers 9 can be adjusted (as Figure 11 shown), so as to meet various grinding requirements.

[0036] Due to the limited length of the grinding roller 9, when the length of the steel structure is greater than the length of the grinding roller 9, when grinding the inner side of the steel structure, the electric extension rod 2 is started, which can drive the whole equipment to penetrate into the steel structure for supplementary grinding.

[0037] The second implementation mode: Figures 13 - 14 As shown, a supplementary motor 21 is installed inside the extension plate 17. The output end of the supplementary motor 21 is connected with a plug-in block, and the plug-in block is plugged and connected to the surface of the second electric push rod 11. The output end of the double-headed motor 8 is plugged and connected to the surface of the power end of the second electric push rod 11. A notch matching the power end of the electric extension rod 2 is provided at the power end of the second electric push rod 11.

[0038] The projection of the notch is located within the effective area of the double-headed motor 8, and the projection of the notch deviates from the area where the output end of the double-headed motor 8 is located.

[0039] Different from the first implementation mode, this implementation mode mainly aims at the problem in the first implementation mode that due to the inability to deeply push and grind inside the square tube body, the grinding area is limited by the length of the grinding roller 9.

[0040] Specifically, in this embodiment, when grinding the square pipe body, the grinding roller 9 needs to be rotated to fit the outer surface of the square pipe first. Then, the supplementary motor 21 is started. After the second electric push rod 11 rotates 90 degrees, the double-headed motor 8 is started to drive the grinding roller 9 to grind the outer surface of the square pipe, and the second electric push rod 11 is used to push the extended grinding length area (as Figure 15 shown), and the fourth electric push rod 20 is used to cooperate with the linear movement of the grinding roller 9.

[0041] When grinding the outer surface of the round pipe, the connection between the second electric push rod 11 and the output end of the double-headed motor 8 needs to be disconnected. Then, using the notch at the power end of the second electric push rod 11, the power ends of the two electric extension rods 2 are respectively slidably inserted to drive the two grinding rollers 9 to perform circular movement (as Figure 16 shown).

[0042] In summary, the first motor 3 drives the gear set to drive the first ring member 13 to rotate. The fifth electric push rod 102 controls the third gear 14 by pushing the rack 15, so that the two grinding rollers 9 can move synchronously or asynchronously to meet the different grinding requirements of the inner and outer walls of the round pipe. The movable assembly can realize the quick locking and separation of the second electric push rod 11 from the first ring member 13 and the second ring member 16, which is convenient for switching between the rotary grinding mode and the linear propulsion mode. The pushing assembly adjusts the angle of the rotating plate 19 through the third motor 18, and cooperates with the rubber roller of the fourth electric push rod 20 to form a supporting reaction force to ensure the stability of the square pipe grinding. While the double-headed motor 8 drives the grinding roller 9 to rotate, it can also drive the second electric push rod 11 to rotate horizontally. For special-shaped cross-sections, the gear meshing mechanism can adjust the angle difference between the two grinding rollers 9. The supplementary motor 21 and the plug-in block design expand the grinding range of the outer side of the square pipe. The power end of the electric extension rod 2 is inserted into the notch of the second electric push rod 11 to realize circular movement grinding, so as to take into account the efficiency of multi-faceted grinding and differential adjustment, and ensure the grinding quality and efficiency.

[0043] Combined with the current actual needs, the above-mentioned embodiment adopted in this application does not limit the protection scope thereto. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. An on-site grinding device for steel structure factory building construction, comprising an operating table (1) and a support frame with a lifting cylinder arranged on one side of the operating table (1), wherein an electric extension rod (2) is installed on the surface of the support frame, characterized in that: The power end of the electric extension rod (2) is plugged with a vertical plate (4), one side surface of the vertical plate (4) is connected to a No. 1 motor (3), and the other side surface of the vertical plate (4) is fixedly mounted with a round rod, and the surface of the round rod is rotatably sleeved with a No. 1 circular ring member (13) and a No. 2 circular ring member (16), and the No. 2 circular ring member (16) is located between the No. 1 circular ring member (13) and the vertical plate (4), and the surfaces of the No. 1 circular ring member (13) and the No. 2 circular ring member (16) are both mounted with a No. 2 electric push rod (11) arranged in a back-to-back manner through a movable component, and the movable end surface of the No. 2 electric push rod (11) is connected to a double-headed motor (8), and one of the output ends of the double-headed motor (8) is connected to A grinding roller (9) is provided, and the surfaces of the No. 1 circular ring member (13) and the No. 2 circular ring member (16) are respectively fixedly sleeved with a No. 2 gear (12) and a No. 3 gear (14), the output end of the No. 1 motor (3) is connected to a long rod, and the surface of the long rod is connected to a No. 1 gear (10) meshing with the No. 2 gear (12), the other side surface of the vertical plate (4) is installed with a No. 5 electric push rod (102) through a bracket, and the power end of the No. 5 electric push rod (102) is connected to a pushing rack (15) meshing with the No. 3 gear (14), and the surfaces of the fixed ends of the two No. 2 electric push rods (11) are both installed with a pushing component for assisting the grinding roller (9) in horizontal pushing.

2. The on-site grinding device for steel structure workshop construction according to claim 1 is characterized in that: The pushing assembly comprises an extension plate (17) mounted on the fixed end surface of the second electric push rod (11); a third motor (18) is mounted on one side surface of the extension plate (17); a rotating plate (19) connected to the output end of the third motor (18) is attached to the other side surface of the extension plate (17); and a fourth electric push rod (20) having a movable end connected to a rubber roller is mounted on the side surface of the rotating plate (19) facing away from the extension plate (17).

3. The on-site grinding device for steel structure workshop construction according to claim 2 is characterized in that: The extension plate (17) and the rotating plate (19) in each of the pushing components are placed in a straight line, and the projection length of the extension plate (17) and the rotating plate (19) on the surface of the No. 2 electric push rod (11) on the surface of the No. 1 circular ring (13) when placed in a straight line is smaller than the length of the fixed end of the No. 2 electric push rod (11).

4. The on-site grinding device for steel structure workshop construction according to claim 1 is characterized in that: The other output end of the double-headed motor (8) is connected to the movable end surface of the second electric push rod (11), and the movable component includes an inner groove arranged at the bottom of the fixed end of the second electric push rod (11), an electromagnetic block (1101) is fixed to the top wall of the inner groove, and a magnetic plug-in (1102) is slidably connected inside the inner groove, and the surfaces of the first circular ring member (13) and the second circular ring member (16) are both provided with a plug-in groove matching the magnetic plug-in (1102).

5. The on-site grinding device for steel structure workshop construction according to claim 4 is characterized in that: The depth of the plug-in slot is less than the height of the magnetic plug-in unit (1102), and the depths of the two plug-in slots are both less than the thicknesses of the first circular ring member (13) and the second circular ring member (16).

6. The on-site grinding device for steel structure workshop construction according to claim 1 is characterized in that: A No. 2 motor (5) is mounted on the side surface of the operating table (1); the output end of the No. 2 motor (5) is connected to a bidirectional screw; a moving block is threadedly sleeved on the surface of the bidirectional screw; a No. 1 electric push rod (6) slidably connected to the inside of the operating table (1) is mounted on the surface of the moving block; a clamping plate (7) is connected to the power end of the No. 1 electric push rod (6); and an anti-slip pad is mounted on the surface of the clamping plate (7).

7. The on-site grinding device for steel structure factory building construction according to claim 3 is characterized by: The length of the rotating plate (19) is greater than the distance between the contact end of the grinding roller (9) and the double-headed motor (8) and the surface of the second electric push rod (11) when in a horizontal state.

8. The on-site grinding device for steel structure factory building construction according to claim 3 is characterized by: A supplementary motor (21) is installed inside the extension plate (17), the output end of the supplementary motor (21) is connected to a plug-in block, and the plug-in block is plug-connected to the surface of the second electric push rod (11), the output end of the double-headed motor (8) is plug-connected to the surface of the power end of the second electric push rod (11), and the power end of the second electric push rod (11) is provided with a notch that matches the power end of the electric extension rod (2).

9. The on-site grinding device for steel structure factory building construction according to claim 8, characterized in that: The projection of the notch is located within the effective area of ​​the double-headed motor (8), and the projection of the notch deviates from the area where the output end of the double-headed motor (8) is located.

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