A ductile cast elbow polishing device

Abstract

The application relates to the technical field of pipe polishing, and discloses a spheroidal graphite cast elbow pipe casting polishing device, which comprises a polishing table, the top of the polishing table is provided with a supporting table and a pair of placing tables, the curved section of the elbow pipe is placed above the supporting table, the straight sections of the elbow pipe are placed above the two placing tables, a motor is arranged on one side of the two ports of the elbow pipe, the output shafts of the motors are fixedly connected with connecting rods, the outer walls of the connecting rods are fixedly connected with polishing knives one and polishing knives two, the diameter of the polishing knives one is the same as the outer diameter length of the elbow pipe, the diameter of the polishing knives two is the same as the inner diameter length of the elbow pipe, an adjusting assembly for driving the two placing tables to adjust positions is arranged below the placing tables, a scrap removing assembly for removing the scraps on the inner wall of the pipe is arranged on the side, away from the motor, of the polishing knives two, the scraps on the inner wall of the pipe caused by polishing can be removed in time through the scrap removing assembly, the elbow pipe is not affected in subsequent use due to the unsmoothness or blockage of the pipe caused by the scraps.

Description

Technical Field

[0001] This invention belongs to the field of pipe bending and grinding technology, specifically relating to a grinding device for ductile iron pipe bending castings. Background Technology

[0002] The ductile iron bend grinding device is a high-efficiency and precise mechanical equipment that performs grinding and polishing on the surface of ductile iron bends through automated or manual methods to remove surface defects, improve surface smoothness, and enhance sealing performance, thereby meeting various application requirements.

[0003] When grinding the two ends and the inner wall of a bent pipe, it is difficult for the same grinding equipment to grind the pipe opening and the inside of the pipe at the same time. Existing grinding equipment cannot meet the grinding needs of the pipe opening and the inner wall at the same time. Different driving devices or tools need to be used for operation, which increases the grinding process and time, resulting in a decrease in overall grinding efficiency.

[0004] Therefore, the present invention provides a grinding device for ductile iron pipe bending castings. Summary of the Invention

[0005] To overcome the shortcomings of the prior art: to solve at least one technical problem raised in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a grinding device for ductile iron pipe bending, including a grinding table, a support platform and a pair of placement platforms on the top of the grinding table, a bent section of the pipe placed on the support platform, a straight section of the pipe placed on the two placement platforms, a motor on one side of each of the two ends of the pipe, a connecting rod fixedly connected to the output shaft of each motor, and a grinding blade one and a grinding blade two fixedly connected to the outer wall of each connecting rod, the diameter of the grinding blade one being the same as the outer diameter of the pipe, and the diameter of the grinding blade two being the same as the inner diameter of the pipe, an adjustment component for adjusting the position of the two placement platforms being provided below the placement platforms, and a chip removal component for processing debris on the inner wall of the pipe being provided on the side of the grinding blade two away from the motor.

[0007] Preferably, the adjustment component includes an arc-shaped slide block, which is fixedly installed on the top of the grinding table. The inner wall of the arc-shaped slide block is symmetrically slidably connected with arc-shaped sliders, and the tops of the two arc-shaped sliders are respectively fixedly connected to the bottoms of the two placement tables.

[0008] Preferably, a telescopic rod is fixedly connected to the side of each of the two arc-shaped sliders. A track is fixedly connected to the end of the telescopic rod away from the arc-shaped slider. An external connector is fixedly connected to the outer wall of the telescopic rod. The end of the track away from the telescopic rod is fixedly connected to the side of the motor. A limit collar is fixedly connected to the side of the external connector. The inner wall of the limit collar is slidably connected to the inner wall of the track and they are mutually adapted.

[0009] Preferably, the chip removal assembly includes two connecting seats, which are rotatably connected to the outer walls of two connecting rods respectively. Each connecting seat has an elastic element on its outer side. The elastic element is conical in shape and has a hollow design. The diameter of the side wall of the elastic element is larger than the inner diameter of the bend.

[0010] Preferably, hinge seats are slidably connected to the inner walls of multiple sides of the connecting seat, and hinge rods are hinged to the inner walls of the hinge seats. A hinge member is hinged to the top of the hinge rod at the end away from the hinge seat. The hinge member is fixedly connected to the outer wall of the elastic member. A torsion spring is fixedly connected to the bottom of the hinge rod. The end of the torsion spring away from the hinge rod is fixedly connected to the top of the connecting seat. An expansion component is provided on one side of each of the two elastic members. The expansion component is used to drive the elastic members to continuously expand and contract.

[0011] Preferably, the expansion assembly includes two telescopic rods, which are respectively fixedly connected to one side of two external components. The ends of the telescopic rods away from the external components are fixedly connected to a connecting frame. A transverse plate is symmetrically fixedly connected above the connecting frame. Several extrusion blocks are fixedly connected to the sides of the transverse plates. The surfaces of the extrusion blocks adjacent to the side connecting blocks are all inclined surfaces. A side connecting block is fixedly connected to one side of each of the two hinge seats.

[0012] Preferably, each extrusion block is equidistant from the others, and an inner spring is fixedly connected to the bottom of the hinge seat. The end of the inner spring away from the hinge seat is fixedly connected to the inner wall of the connecting seat.

[0013] Preferably, a feeding ramp is provided below each of the two elastic members, and a collection box is provided at the bottom of each feeding ramp, with the collection box placed on one side of the external member.

[0014] Preferably, a rack plate is fixedly connected to one side of the connecting frame, the rack plate has a gear meshing with its teeth, a rotating rod is fixedly connected to the inner wall of the gear, a plurality of convex ring blocks are fixedly connected to the outer wall of the rotating rod, a torsion spring II is fixedly connected to the bottom of the feeding inclined plate, the end of the torsion spring II away from the feeding inclined plate is fixedly connected to the top of the external connector, and a clamping member is rotatably connected to the outer wall of the rotating rod. The clamping member is fixedly installed on the connecting rod that connects the limiting collar and the external connector.

[0015] Preferably, a connecting platform is fixedly connected above each of the two placement platforms, and a threaded rod is threadedly connected to the inner wall of each connecting platform. A clamping pad is fixedly connected to the bottom of each threaded rod, and a knob is fixedly connected to the top of each threaded rod. A limit rod is fixedly connected above each clamping pad, and the limit rod is inserted into the inner wall of the connecting platform.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The grinding device for ductile iron pipe bending as described in this invention can precisely adjust the positions of the two placement platforms by adjusting the components, ensuring that the two straight sections of the bending pipe can be stably and accurately clamped, and also ensuring that the grinding tool is always aligned with the end wall of the bending pipe, thereby improving the grinding accuracy and quality.

[0018] 2. The ductile iron bend grinding device of the present invention can promptly clean the debris generated by grinding on the inner wall of the pipe through the chip removal component, so as to avoid the debris causing the pipe to be obstructed or blocked, thereby affecting the subsequent use of the bend.

[0019] 3. The grinding device for ductile iron pipe bending as described in this invention, through the expansion component, causes the wall surface of the inner shell of the elastic element to vibrate, thereby making it easier and faster for the debris on the wall surface of the inner shell of the elastic element to fall off. The vibration helps to shake off the debris on the wall surface of the inner shell of the elastic element more quickly and thoroughly, thereby improving the efficiency and quality of debris removal. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a three-dimensional view of the entire invention;

[0022] Figure 2 This is a schematic diagram of the arc-shaped slide block structure in this invention;

[0023] Figure 3 This is a schematic diagram of the structure of the arc-shaped slider in this invention;

[0024] Figure 4 This is a schematic diagram of one part of the telescopic rod in this invention;

[0025] Figure 5 This is a schematic diagram of the structure of the elastic element in this invention;

[0026] Figure 6 This is a schematic diagram of the structure of the clamping component in this invention;

[0027] Figure 7 This is a schematic diagram of the two structures of the telescopic rod in this invention;

[0028] Figure 8 This is a schematic diagram of the structure at the extrusion block in this invention;

[0029] Figure 9 This is a schematic diagram of the gear structure in this invention.

[0030] In the diagram: 1. Grinding table; 2. Support table; 3. Placement table; 4. Grinding blade one; 5. Grinding blade two; 6. Motor; 7. Connecting rod; 8. Arc-shaped slide; 9. Arc-shaped slider; 10. Connecting platform; 11. Clamping pad; 12. Threaded rod; 13. Knob; 14. Limiting rod; 15. Telescopic rod one; 16. Track; 17. Limiting collar; 18. Elastic element; 19. Hinge; 2 0. Hinge rod; 21. Hinge seat; 22. Connecting seat; 23. Torsion spring one; 24. External connector; 25. Telescopic rod two; 26. Connecting frame; 27. Horizontal plate; 28. Extrusion block; 29. ​​Side connecting block; 30. Inner spring; 31. Rack plate; 32. Gear; 33. Rotating rod; 34. Convex ring block; 35. Feeding inclined plate; 36. Collection box; 37. Torsion spring two; 38. Clamping component. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0032] like Figures 1 to 9 As shown, the present invention provides a technical solution: a grinding device for ductile iron pipe bending castings, including a grinding table 1, a support platform 2 and a pair of placement platforms 3 on the top of the grinding table 1, the bent section of the pipe being placed above the support platform 2, the straight section of the pipe being placed above the two placement platforms 3, a motor 6 being provided on one side of each of the two ends of the pipe, a connecting rod 7 being fixedly connected to the output shaft of each motor 6, and a grinding blade 4 and a grinding blade 5 being fixedly connected to the outer wall of each connecting rod 7, the diameter of the grinding blade 4 being the same as the outer diameter of the pipe, and the diameter of the grinding blade 5 being the same as the inner diameter of the pipe, an adjustment component for adjusting the position of the two placement platforms 3 being provided below the placement platforms 3, and a chip removal component for processing the debris on the inner wall of the pipe being provided on the side of the grinding blade 5 away from the motor 6.

[0033] During operation: When grinding bent pipes, since the degree of bending varies between different batches, the degree of bending of the same batch of bent pipes is measured in advance before grinding. The positions of the two placement tables 3 are adjusted by the adjustment component so that the two straight sections of the bent pipes in that batch can be accurately placed and clamped above the two placement tables 3. While adjusting the positions of the two placement tables 3, the grinding blades 4 and 5 follow the position adjustment of the placement tables 3 to ensure that the grinding blades 4 and 5 are always aligned with the end wall of the bent pipe. When grinding the bent pipe, the grinding blades 4 and 5 and the chip removal component simultaneously approach the end wall of the bent pipe. The chip removal component and the grinding blade 5 enter the inner wall of the bent pipe in sequence. Since the diameter of the grinding blade 25 is the same as the inner diameter of the bent pipe, the motor 6 rotates the grinding blade 25 through the connecting rod 7 to remove burrs from the inner wall of the bent pipe. During the grinding process, when the grinding blade 4 approaches and comes into contact with the wall of the bend, the motor 6 drives the grinding blade 4 to rotate and grind the wall of the bend, since the diameter of the grinding blade 4 is the same as the outer diameter of the bend. During the grinding process, the debris generated by the grinding blades 4 and 5 falls into the inner wall of the bend. After grinding, when the debris removal component retracts along the inner wall of the bend, it can remove all the debris from the inner wall of the bend, thus processing the debris generated during pipe grinding. Through the above embodiment, the adjustment component can precisely adjust the position of the two placement platforms 3 to ensure that the two straight sections of the bend can be stably and accurately clamped, and can also ensure that the grinding tool is always aligned with the wall of the bend, thereby improving the accuracy and quality of grinding. The debris removal component can promptly clean the debris generated by grinding on the inner wall of the pipe, avoiding debris from causing pipe obstruction or blockage, thus affecting the subsequent use of the bend.

[0034] like Figures 1 to 2 As shown, the adjustment assembly includes an arc-shaped slide 8, which is fixedly installed on the top of the grinding table 1. Arc-shaped sliders 9 are symmetrically slidably connected to the inner wall of the arc-shaped slide 8, and the tops of the two arc-shaped sliders 9 are fixedly connected to the bottoms of the two placement tables 3 respectively.

[0035] During operation: After measuring the degree of bending of the same batch of bent pipes, the arc-shaped slide block 8 is energized and started. After the arc-shaped slide block 8 is energized and started, the two arc-shaped sliders 9 will slide bidirectionally along the inner wall of the arc-shaped slide block 8. The two arc-shaped sliders 9 move closer or further away from each other. Therefore, during the process of adjusting the two arc-shaped sliders 9 to slide on its inner wall, the two arc-shaped sliders 9 can adjust their positions according to the arc trajectory. When facing bent pipes with the same straight section length but different bending angles, the two placement tables 3 can both be adjusted to place the straight section of the bent pipe on top of them. The precise adjustment of the placement tables 3 ensures that the grinding tool can always be aligned with the end wall of the bent pipe, regardless of how the bending angle of the bent pipe changes.

[0036] like Figures 3 to 4As shown, telescopic rods 15 are fixedly connected to the sides of both arc-shaped sliders 9. Tracks 16 are fixedly connected to the ends of telescopic rods 15 away from the arc-shaped sliders 9. External connectors 24 are fixedly connected to the outer walls of telescopic rods 15. The end of track 16 away from telescopic rods 15 is fixedly connected to one side of motor 6. Limiting collars 17 are fixedly connected to one side of external connectors 24. The inner wall of limiting collars 17 is slidably connected to the inner wall of track 16 and they are mutually adapted.

[0037] During operation: After the position of the bent pipe is fixed, the telescopic rod 15 is stretched. When the telescopic rod 15 is stretched, the track 16 will slide along the inner wall of the limiting collar 17. When the track 16 slides, the motor 6 will drive the grinding blade 4, the grinding blade 5 and the chip removal assembly to always move in alignment with the end wall of the bent pipe, thereby performing grinding and dust removal work. By connecting the telescopic rod 15 with the arc-shaped slider 9, after adjusting the position of the placement platform 3 and placing the bent pipe, the telescopic rod 15 can always enter different positions of the bent pipe according to the expected movement path to perform grinding work when controlling the movement of the grinding tools and the chip removal assembly.

[0038] like Figures 4 to 5 As shown, the chip removal assembly includes two connecting seats 22, which are rotatably connected to the outer walls of the two connecting rods 7 respectively. Each connecting seat 22 has an elastic element 18 on its outer side. The elastic element 18 is conical in shape and has a hollow design. The diameter of the side wall of the elastic element 18 is larger than the inner diameter of the bend.

[0039] During operation: Since the elastic element 18 is located at the front end of the second grinding blade 5, when the first telescopic rod 15 moves the second grinding blade 5 and the elastic element 18, the elastic element 18 will first enter the inner wall of the bent pipe. Because the elastic element 18 is conical in shape and is made of elastic material, as the elastic element 18 gradually enters the inner wall of the bent pipe, its sides will be deformed by the pressure from the wall of the bent pipe end. This allows the side of the elastic element 18 to completely fit against the inner wall of the bent pipe when it is fully inside. After the second grinding blade 5 enters the inner wall of the bent pipe and completes the grinding, the elastic element 18 can remove all the debris when it moves back from the inner wall of the bent pipe. Since the diameter of the side wall of the elastic element 18 is larger than the inner diameter of the bent pipe, the elastic element 18 can be used for bent pipes with different inner diameters. Moreover, after the elastic element 18 enters the inner wall of the bent pipe, it can completely fit against the inner wall when it is squeezed, thereby removing all the debris from the inner wall of the bent pipe.

[0040] like Figures 5 to 7As shown, hinge seats 21 are slidably connected to the inner walls of multiple sides of the connecting seat 22. Hinges 20 are hinged to the inner walls of the hinge seats 21. Hinges 19 are hinged to the top of the hinge rods 20 away from the hinge seats 21. Hinges 19 are fixedly connected to the outer walls of the elastic members 18. Torsion springs 23 are fixedly connected to the bottom of the hinge rods 20. The ends of the torsion springs 23 away from the hinge rods 20 are fixedly connected to the top of the connecting seat 22. Expansion components are provided on one side of the two elastic members 18. The expansion components are used to drive the elastic members 18 to continuously expand and contract.

[0041] During operation: When the elastic element 18 gradually enters the inner wall of the bend and is compressed and deformed, the hinge 19 moves downward and compresses the torsion spring 23, causing it to deform. The hinge seat 21 slides in the inner wall of the connecting seat 22, thus making an adaptive automatic adjustment according to the diameter of the inner wall of the bend. When the elastic element 18 enters the inner wall of the bend, its side is in close contact with the inner wall of the bend. When the elastic element 18 retracts, under the action of the torsion spring 23, the elastic element 18 gradually recovers its deformation. When the elastic element 18 retracts, its outer edge always remains in contact with the inner wall of the bend. Under the action of the torsion spring 23, the elastic element 18 will not flip over, causing some debris to be leaked. Since some debris will adhere to the inner wall of the elastic element 18, the expansion component drives the elastic element 18 to continuously expand and contract, so that all the adhered debris can fall out and be collected.

[0042] like Figures 6 to 8 As shown, the expansion assembly includes two telescopic rods 25, which are fixedly connected to one side of two external connectors 24 respectively. The ends of the telescopic rods 25 away from the external connectors 24 are fixedly connected to a connecting frame 26. A transverse plate 27 is symmetrically fixedly connected above the connecting frame 26. Several extrusion blocks 28 are fixedly connected to the sides of the transverse plate 27. The surfaces of the extrusion blocks 28 adjacent to the side connectors 29 are all inclined surfaces. The side connectors 29 are fixedly connected to one side of each of the two hinge seats 21.

[0043] During operation: After the elastic element 18 completes the chip removal work and retracts to its original position, the telescopic rod 25 is retracted. The telescopic rod 25 will drive the two sets of transverse plates 27 to gradually approach the connecting seat 22 through the connecting frame 26. Since the surfaces adjacent to the pressing block 28 and the side connecting block 29 are inclined, when the two sets of pressing blocks 28 come into contact with the upper and lower side connecting blocks 29, they will press the side connecting blocks 29, causing the hinge seat 21 to slide along the inner wall of the connecting seat 22. When the hinge seat 21 slides, the upper and lower surfaces of the elastic element 18 will reciprocate and expand. The reciprocating expansion will cause the wall surface of the inner shell of the elastic element 18 to vibrate, making it easier and faster for the debris on the inner shell wall surface of the elastic element 18 to fall off. The vibration helps to shake off the debris on the inner shell wall surface of the elastic element 18 more quickly and thoroughly, thereby improving the efficiency and quality of chip removal.

[0044] like Figures 7 to 8 As shown, each extrusion block 28 is equidistantly distributed, and an inner spring 30 is fixedly connected to the bottom of the hinge seat 21. The end of the inner spring 30 away from the hinge seat 21 is fixedly connected to the inner wall surface of the connecting seat 22.

[0045] During operation: The horizontal plate 27 moves close to the connecting seat 22. The pressing block 28 presses the hinge seat 21 through the side connecting block 29, causing the elastic element 18 to expand. When the hinge seat 21 moves, it will compress the inner spring 30 and deform. Since each pressing block 28 is equidistantly distributed, when the side connecting block 29 is not in contact with the pressing block 28, the hinge seat 21 will cause the elastic element 18 to contract and recover its deformation under the action of the inner spring 30. The expansion and contraction of the elastic element 18 achieves the effect of continuous vibration of its inner shell wall. By setting multiple pressing blocks 28, the elastic element 18 can continuously vibrate multiple times to ensure that all debris can fall out.

[0046] like Figure 6 and Figure 9 As shown, a feeding ramp 35 is provided below each of the two elastic members 18, and a collection box 36 is provided at the bottom of each feeding ramp 35. The collection box 36 is placed on one side of the external member 24.

[0047] During operation: The debris carried out by the elastic element 18 and the debris that falls off during the shaking will slide down the inclined surface of the feeding plate 35 and fall into the corresponding collection box 36 for centralized collection.

[0048] like Figure 7 and Figure 9 As shown, a rack plate 31 is fixedly connected to one side of the connecting frame 26. The rack plate 31 is meshed with a gear 32. A rotating rod 33 is fixedly connected to the inner wall of the gear 32. Multiple convex ring blocks 34 are fixedly connected to the outer wall of the rotating rod 33. A torsion spring 37 is fixedly connected to the bottom of the feeding inclined plate 35. The end of the torsion spring 37 away from the feeding inclined plate 35 is fixedly connected to the top of the external connector 24. A clamping member 38 is rotatably connected to the outer wall of the rotating rod 33. The clamping member 38 is fixedly installed on the connecting rod connecting the limiting collar 17 and the external connector 24.

[0049] During operation: When the telescopic rod 25 moves the transverse plate 27 and the extrusion block 28, causing the elastic element 18 to vibrate, it will also move the rack plate 31. When the rack plate 31 moves, it will drive the gear 32 meshing with it to rotate. When the gear 32 rotates, it will drive multiple convex ring blocks 34 to rotate through the rotating rod 33. When the multiple convex ring blocks 34 rotate, they will continuously hit the bottom of the feeding inclined plate 35. After being hit, the feeding inclined plate 35 will continuously stretch or compress the torsion spring 37 to deform, thereby causing the feeding inclined plate 35 to vibrate. The debris on the slope of the feeding inclined plate 35 can fall into the collection box 36 for collection more quickly.

[0050] like Figure 2 As shown, a connecting platform 10 is fixedly connected above each of the two placement platforms 3. A threaded rod 12 is threadedly connected to the inner wall of each connecting platform 10. A clamping pad 11 is fixedly connected to the bottom of each threaded rod 12. A knob 13 is fixedly connected to the top of each threaded rod 12. A limiting rod 14 is fixedly connected above each clamping pad 11. The limiting rod 14 is inserted into the inner wall of the connecting platform 10.

[0051] During operation: When the two straight sections of the bent pipe are placed above the two placement platforms 3, turn the knob 13. The knob 13 will drive the threaded rod 12 to rotate. When the threaded rod 12 rotates, due to the restriction of the limit rod 14, the clamping pad 11 will move downward. When the two clamping pads 11 contact and wrap around the outer wall of the two straight sections of the bent pipe respectively, stop turning the knob 13. At this time, the clamping pads 11 fix the straight sections of the bent pipe directly above the placement platform 3, thereby ensuring that the bent pipe will not shift in position due to vibration or other factors during grinding, and improving the grinding accuracy.

[0052] 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 illustrative of the principles of 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 ductile iron pipe bends, comprising a grinding table, characterized in that: The top of the grinding table is equipped with a support platform and a pair of placement platforms. A motor is installed on one side of each of the two ends of the bend. The output shaft of each motor is fixedly connected to a connecting rod. Grinding blade one and grinding blade two are fixedly connected to the outer wall of each connecting rod. The diameter of grinding blade one is the same as the outer diameter of the bend, and the diameter of grinding blade two is the same as the inner diameter of the bend. An adjustment component for adjusting the position of the two placement platforms is installed below the placement platforms. A chip removal component for removing debris from the inner wall of the pipe is installed on the side of grinding blade two away from the motor. The chip removal assembly includes two connecting seats, which are rotatably connected to the outer walls of two connecting rods respectively. Each connecting seat has an elastic element on its outer side. The elastic element is conical in shape and has a hollow design. The diameter of the side wall of the elastic element is larger than the inner diameter of the bend. The inner walls of multiple sides of the connecting seat are slidably connected to hinge seats. The inner walls of the hinge seats are all hinged to hinge rods. The top of the hinge rods, away from the hinge seat, is hinged to a hinge element. The hinge elements are all fixedly connected to the outer wall of the elastic element. The bottom of the hinge rods is fixedly connected to a torsion spring. The end of the torsion spring away from the hinge rod is fixedly connected to the top of the connecting seat. An expansion assembly is provided on one side of each of the two elastic elements. The expansion assembly is used to drive the elastic elements to continuously expand and contract. After the elastic element enters the inner wall of the bend, it can completely fit with the inner wall when squeezed, bringing out all the debris in the inner wall of the bend.

2. The grinding device for ductile iron pipe bends according to claim 1, characterized in that: The adjustment assembly includes an arc-shaped slide block, which is fixedly installed on the top of the grinding table. The inner wall of the arc-shaped slide block is symmetrically connected to arc-shaped sliders, and the tops of the two arc-shaped sliders are fixedly connected to the bottoms of the two placement tables respectively.

3. The grinding device for ductile iron pipe bends according to claim 2, characterized in that: Both curved sliders are fixedly connected to a telescopic rod. The end of the telescopic rod away from the curved slider is fixedly connected to a track. The outer wall of the telescopic rod is fixedly connected to an external connector. The end of the track away from the telescopic rod is fixedly connected to one side of the motor. The side of the external connector is fixedly connected to a limit collar. The inner wall of the limit collar is slidably connected to the inner wall of the track and they are mutually adapted.

4. The grinding device for ductile iron pipe bends according to claim 3, characterized in that: The expansion assembly includes two telescopic rods, which are fixedly connected to one side of two external components. The ends of the telescopic rods away from the external components are fixedly connected to a connecting frame. A transverse plate is symmetrically fixedly connected above the connecting frame. Several extrusion blocks are fixedly connected to the sides of the transverse plates. The surfaces of the extrusion blocks adjacent to the side connecting blocks are all inclined surfaces. A side connecting block is fixedly connected to one side of each of the two hinge seats.

5. A grinding device for ductile iron pipe bends according to claim 4, characterized in that: Each extrusion block is equidistant from the others. An inner spring is fixedly connected to the bottom of the hinge seat, and the end of the inner spring away from the hinge seat is fixedly connected to the inner wall of the connecting seat.

6. The grinding device for ductile iron pipe bends according to claim 5, characterized in that: Both elastic components are provided with a feeding ramp below them, and a collection box is provided at the bottom of each feeding ramp. The collection boxes are placed on one side of the external component.

7. A grinding device for ductile iron pipe bends according to claim 6, characterized in that: A rack plate is fixedly connected to one side of the connecting frame. The rack plate has teeth that mesh with gears. A rotating rod is fixedly connected to the inner wall of the gear. Multiple convex ring blocks are fixedly connected to the outer wall of the rotating rod. A torsion spring II is fixedly connected to the bottom of the feeding inclined plate. The end of the torsion spring II away from the feeding inclined plate is fixedly connected to the top of the external connector. A clamping component is rotatably connected to the outer wall of the rotating rod. The clamping component is fixedly installed on the connecting rod that connects the limiting collar and the external connector.

8. A grinding device for ductile iron pipe bends according to claim 7, characterized in that: Both placement platforms are fixedly connected to a connecting platform above them. The inner wall of each connecting platform is threaded with a threaded rod. The bottom of each threaded rod is fixedly connected with a clamping pad. The top of each threaded rod is fixedly connected with a knob. The top of each clamping pad is fixedly connected with a limit rod, which is inserted into the inner wall of the connecting platform.

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