A kind of edge grinding equipment and edge grinding method for ductile cast iron top pipe production

Abstract

This invention discloses a grinding device and method for producing ductile iron jacking pipes, relating to the field of jacking pipe grinding technology. The grinding device for producing ductile iron jacking pipes includes: a grinding unit, which controls the movement of a grinding wheel in three axes to grind it against the pipe body; the grinding unit includes: a horizontal moving component, a vertical moving component connected above the horizontal moving component, and a lifting component connected to the vertical moving component via a rotating component; and a multi-position dust collection device fitted outside the grinding device, which forms a cover around the connection between the grinding wheel and the pipe body and promptly absorbs the debris generated during grinding. This grinding device and method for producing ductile iron jacking pipes allows for three-dimensional adjustment of the grinding device to ensure precise contact between the pipe body edges and the grinding wheel, forming a closed dust collection box to reduce dust escape. It is easy to assemble and disassemble and can be adapted to the grinding needs of pipes of different specifications.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking edge grinding technology, specifically to a grinding equipment and grinding method for the production of ductile iron pipe jacking. Background Technology

[0002] The grinding equipment for ductile iron pipe jacking production is a specialized automated / semi-automated machine used in the production process of ductile iron pipe jacking to grind the pipe ends. Its core function is to remove casting flash, burrs, riser residue, and surface defects from the pipe ends through mechanical grinding, correcting the flatness, perpendicularity, and roughness of the ends. This ensures that the pipe ends meet the sealing and connection accuracy requirements during pipe jacking construction, guaranteeing the pipe's compressive strength, sealing, and construction continuity during underground jacking operations.

[0003] Referring to Chinese Patent Publication No. CN111421417B, a grinding system for the weld ring of a ductile iron pipe spigot belongs to the technical field of auxiliary equipment for pipe processing. It includes a rotating device, a grinding device, a supporting mechanism, and a control mechanism. The rotating device drives the ductile iron pipe to rotate. The grinding device, aided by the rotation of the rotating device, grinds the weld slag around the circumferentially rotating weld ring of the ductile iron pipe spigot. The supporting mechanism supports the ductile iron pipe for circumferential rotation, and its horizontal position is adjustable. The control mechanism controls both the rotation of the rotating device and the grinding of the grinding device. The ductile iron pipe spigot weld ring grinding system provided by this invention has the technical advantages of coordinating grinding with the pipe's rotation, reducing the labor intensity of manual weld slag grinding, providing precise control of the grinding position, and achieving high grinding efficiency.

[0004] Handheld grinding machines, relying on manual operation, struggle to precisely control the relative position, angle, and grinding force between the grinding wheel and the pipe. This results in poor dimensional tolerances, surface flatness, and angular consistency in the spigot components, easily leading to uneven wall thickness, misaligned joints, and poor subsequent assembly compatibility, resulting in a high rework rate. Handheld devices require simultaneous operation of the grinding wheel and pipe positioning, making the process cumbersome and physically demanding, prone to fatigue during prolonged use, and time-consuming for grinding a single pipe spigot, failing to meet the efficiency requirements of mass production. When the grinding wheel is running at high speed, manual hand operation is not stable enough, and the grinding wheel is prone to deviation and breakage, which may cause scratches on the pipe surface or personal injury to the operator, resulting in poor safety protection performance. In the edge grinding process of ductile iron jacking pipe production, a large amount of cast iron dust is generated when the grinding wheel grinds the jacking pipe spigot, end face and other parts. Generally, a high-power dust collection device is set above the processing position to absorb the dust at the dust outlet and the dust remaining in the factory. However, the equipment is large in size, expensive, difficult to maintain, and has poor compatibility with the grinding wheel. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a grinding device and method for producing ductile iron jacking pipes. The three-dimensional adjustment grinding device ensures precise contact between the pipe edges and the grinding wheel, and the device is fitted together to form a closed dust collection box, reducing dust escape. It is easy to assemble and disassemble and can be adapted to the grinding needs of pipes of different specifications.

[0006] Technical Solution: To achieve the above objectives, the present invention is implemented through the following technical solution: A grinding device for producing ductile iron jacking pipes, comprising: a rotating workpiece, wherein the rotating shaft of the rotating workpiece is connected to an angle wheel, the angle wheel is rotatably connected to the pipe body, and a grinding device is abutting the edge of the pipe body. The grinding device is used to control the grinding wheel to move in three-axis directions and grind it after it fits against the pipe body. The grinding device includes: a horizontal moving part, a vertical moving part connected above the horizontal moving part, a rotating part rotatably connected above the vertical moving part, a lifting part connected to the top of the rotating part, and a multi-position sleeve dust collection device sleeved on the outside of the grinding device. The multi-position sleeve dust collection device is used to form a cover for the part outside the connection between the grinding wheel and the pipe body and to absorb the debris generated at the grinding point in a timely manner.

[0007] Preferably, the horizontal moving component includes: a guide rail, a groove is provided on one side of the guide rail, a pulley is slidably connected to the groove, and a moving plate is connected to one side of the pulley; the vertical moving component includes: a first threaded rod, the bottom of the first threaded rod is fixedly connected to the top of the moving plate, and an upper nut and a lower nut are threadedly connected to the first threaded rod.

[0008] Preferably, the lifting component includes: a support handle, a fixed rod fixedly connected to one side of the support handle, a first connecting plate fixedly connected to one end of the fixed rod, a first side plate connected to the bottom edge of the first connecting plate, a fixed connection between the top of the first connecting plate and the fixed end of the motor, and the rotating end of the motor connected to the grinding wheel through a first rotating shaft.

[0009] Preferably, the rotating component includes: a second connecting plate located directly below the first connecting plate; two symmetrically distributed second side plates connected to the top edge of the second connecting plate; a second rotating shaft disposed between the two second side plates; the two ends of the second rotating shaft being fixedly connected to the sides of the two second side plates respectively; a bottom rod fixedly connected to the center of the bottom of the second connecting plate; a rotating wheel connected to the side of the bottom rod; an outer cylinder disposed outside the rotating wheel; the outer cylinder being rotatably connected to the rotating wheel; and a lifting plate fixedly connected to the bottom of the outer cylinder, the lifting plate being located between the upper nut and the lower nut.

[0010] Preferably, the multi-position sleeve dust collection device includes: a vacuum cleaner, the bottom of which is fixedly connected to the top of the moving plate, the suction end of the vacuum cleaner is connected to a pipe, the top end of the pipe is connected to a positioning connector, the two ends of the positioning connector are respectively connected to a dust collection fixing component and a dust collection sleeve, and the dust collection fixing component is connected to the fixed end of the motor.

[0011] Preferably, the dust collection fixing component includes: an inclined box, which is located between the motor and the tube body, with the inclined box having an angle of 45-60° with the horizontal plane. Several extension plates are fixedly connected to the side of the inclined box near the motor, and a fixed foot is connected to one end of each extension plate. A circular hole is opened through one side of the fixed foot, and a second threaded rod is slidably connected to the circular hole. Several threaded holes are opened at the fixed end of the stepper motor, and the second threaded rod is threadedly connected to the threaded holes. A dust suction port is opened at the bottom of the inclined box.

[0012] Preferably, the positioning connector includes: a bucket tube, one end of which is connected to one end of the inclined box, and the other end of which is connected to the nozzle. The inner wall of the nozzle is fixedly connected with two inner arc plates and a sealing pressure ring. The two inner arc plates are located between the nozzle and the sealing pressure ring. Several guide strips are fixedly connected to the side of the inner arc plates away from the nozzle, and each guide strip has an insertion hole on one side.

[0013] Preferably, the inner diameter of the inner arc plate is smaller than the diameter of the sealing ring, one side of the inner arc plate is fixedly connected to the sealing ring, the sealing ring is made of elastic rubber, the distances from the two inner arc plates to the axis of the nozzle are equal, the diameter of the bucket tube near the inclined box is larger than the diameter of the bucket tube away from the inclined box, the dust suction port penetrates the bottom of the inclined box and the bucket tube, the dust suction port is connected to the dust suction pipe, and the top of the pipe is connected to the dust suction pipe.

[0014] Preferably, the dust collection sleeve includes: a sleeve located on one side of the inclined box, the sleeve being formed by an arc plate and a curved plate, the arc plate being adapted to the arc surface of the tube body, the distance between the arc plate and the tube body being 3-6 mm, an insert rubber sheet being fixedly connected to the arc surface of the curved plate near the sleeve end, a friction port being opened through one side of the arc plate, the friction port being an arc-shaped hole, the friction port being located in the contact area between the tube body and the grinding wheel, an end plate being fixedly connected to one end of the sleeve, and several insert rods being fixedly connected to one side of the end plate, each insert rod being adapted to an insert hole, the diameter of the insert rubber sheet being equal to the inner diameter of the sealing pressure ring, the sleeve, inclined box, bucket tube, and nozzle being all made of transparent material, the diameter of the bucket tube near the inclined box end being larger than the diameter of the bucket tube away from the inclined box end, the bucket tube and the inclined box forming a suction tube, the bottom edge line of the suction tube being V-shaped, the lowest point of the connection between the bucket tube and the inclined box being the lowest point of the suction tube, and the suction port being located at the lowest point of the suction tube.

[0015] A grinding method for producing ductile iron jacking pipes is applied to a grinding device for producing ductile iron jacking pipes. The grinding position is determined, the dust collection fixing component is rotated so that the inclined box is located on the grinding side of the pipe body, the dust collection fixing component is fixed to the fixed end of the motor as a whole, the base plate is moved, and the grinding device is moved in three dimensions so that the edge of the pipe body passes through the friction port and abuts against the grinding wheel. The sleeve is adapted to the guide strip, and the sleeve moves along the axis of the guide strip. The sleeve and the plug rubber sheet move towards the direction close to the bucket pipe. The plug rubber sheet and the sealing strip contact each other and are squeezed to form a sealing surface. The plug plate is inserted into the plug hole. The dust collection sleeve is connected to the dust collection fixing component as a whole through the positioning connector, which accommodates the grinding wheel and forms a dust collection box body on the grinding side of the grinding wheel.

[0016] Beneficial Effects: This invention provides a grinding device and method for ductile iron jacking pipe production. Compared with existing technologies, it has the following beneficial effects: 1. First, the grinding position of the pipe body is clearly defined and the posture of the dust collection fixing component is precisely adjusted. Then, the three-dimensional moving grinding device ensures that the corners of the pipe body are precisely contacted with the grinding wheel, ensuring no deviation in the grinding position and improving the flatness and accuracy of the grinding of the pipe body corners. The dust collection fixing component is firmly connected to the motor fixing end, and the dust collection sleeve is stably spliced ​​with the dust collection fixing component through the positioning connector, avoiding loosening and displacement of components during grinding or dust collection, reducing equipment failure and safety hazards. The inserted rubber sheet and the sealing pressure ring are squeezed to form a sealing surface, which, together with the splicing of various components, forms a closed dust collection box, which can completely wrap the grinding area of ​​the grinding wheel, greatly reducing dust escape. Combined with the dust collection structure design, it achieves efficient dust collection, taking into account both environmental cleanliness and operator health.

[0017] 2. The 45-60° angled suction box with a V-shaped bottom structure allows dust to converge at the lowest point of the suction port under the combined action of gravity and negative pressure airflow, preventing residue buildup. The design of the tubing covering the dust-generating area at the large end and narrowing at the small end increases airflow velocity and concentrates suction power, improving dust adsorption and reducing the risk of leakage. The suction port is located at the lowest point of the V-shape, directly facing the dust convergence target, enabling rapid and thorough dust collection. The compact size of the angled box and tubing allows them to be embedded in the gap between the motor and the tubing, working in conjunction with the dust collection sleeve to form a sealed suction box, preventing dust escape.

[0018] 3. The suction port is directly facing the core dust-generating area of ​​the grinding process. The seamlessly connected suction pipe, combined with negative pressure suction and gravity, quickly removes dust, resulting in high collection efficiency. The insert rubber sheet and sealing ring are pressed together to form a seamless sealing surface, and the small gap design between the sleeve and the pipe body prevents dust from escaping. The positioning structure of the guide strip and the insertion rod ensures precise installation, stable splicing, and convenient assembly and disassembly of the dust collection socket.

[0019] 4. The dust collection connector slides along the guide strip for easy fitting, and the insertion rod precisely aligns with the insertion hole, facilitating easy assembly and disassembly. The edge grinding device can move in three dimensions, and the dust collection components can be flexibly adjusted to adapt to the edge grinding needs of different pipe sizes. The dust collection system works synchronously with the grinding device, integrating positioning, fixing, and sealing dust collection into a single operation. The process is seamless, eliminating the need for extra cumbersome steps and effectively improving overall work efficiency. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present application and, together with the specification, further serve to explain the principles of the present application and enable those skilled in the art to implement and use the present application.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a structural diagram of the base plate, tube body, rotating workpiece, and corner wheel.

[0024] Figure 3 This is a structural diagram of the edge grinding device, the multi-position sleeve dust collection device, and the pipe body.

[0025] Figure 4 This is a schematic diagram of the edge grinding device and the multi-position sleeve dust collection device.

[0026] Figure 5 This is a schematic diagram of the edge grinding device.

[0027] Figure 6 This is a structural diagram of the lifting and rotating components.

[0028] Figure 7 This is a schematic diagram of the rotating component.

[0029] Figure 8 This is a schematic diagram of a multi-position dust collection device and a grinding wheel.

[0030] Figure 9 This is a diagram showing the separation of the grinding wheel from the inclined box and sleeve.

[0031] Figure 10 for Figure 9 A cross-sectional view after the grinding wheel has been removed.

[0032] Figure 11 This is a structural diagram of the dust collection fixing component, positioning connector, and dust collection sleeve.

[0033] Figure 12 This is a structural diagram of the positioning connector.

[0034] Figure 13 An exploded view of the positioning connector.

[0035] Figure 14 This is a structural schematic diagram of the dust collection sleeve.

[0036] The reference numerals in the figure are as follows: 11, base plate; 12, tube body; 13, rotating workpiece; 14, angle wheel; 2, grinding device; 21, horizontal moving part; 211, guide rail; 212, slide groove; 213, pulley; 214, moving plate; 22, vertical moving part; 221, first threaded rod; 222, lower nut; 223, upper nut; 23, lifting part; 231, support handle; 232, fixing rod; 233, first connecting plate; 234, first side plate; 235, motor; 236, first rotating shaft; 237, grinding wheel; 24, rotating part; 241, second connecting plate; 242, second side plate; 243, second rotating shaft; 244. Base rod; 245. Rotating wheel; 246. Outer cylinder; 247. Lifting plate; 3. Multi-position sleeve dust collection device; 31. Vacuum cleaner; 32. Pipe; 33. Dust collection fixing component; 331. Inclined box; 332. Dust suction port; 333. Extension plate; 334. Fixing foot; 335. Second threaded rod; 34. Positioning connector; 341. Bucket tube; 342. Nozzle; 343. Inner arc plate; 344. Guide strip; 345. Insertion hole; 346. Sealing pressure ring; 347. Dust suction pipe; 35. Dust collection sleeve; 351. Sleeve; 352. Friction port; 353. Inserted rubber sheet; 354. End plate; 355. Insert rod.

[0037] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, 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.

[0039] like Figure 1 - Figure 14 As shown, the present invention provides a grinding device for the production of ductile iron jacking pipes, comprising: a rotating workpiece 13, a rotating shaft of the rotating workpiece 13 connected to an angle wheel 14, the angle wheel 14 being rotatably connected to a pipe body 12, a grinding device 2 abutting the corner of the pipe body 12, the grinding device 2 being used to control the grinding wheel 237 to move in a three-axis direction and to grind it after it comes into contact with the pipe body 12, the grinding device 2 comprising: a horizontal moving part 21, a vertical moving part 22 connected above the horizontal moving part, a rotating part 24 rotatably connected above the vertical moving part 22, a lifting part 23 connected to the top of the rotating part 24, and a multi-position sleeve dust collection device 3 sleeved on the outside of the grinding device 2, the multi-position sleeve dust collection device 3 being used to form a cover on the part outside the connection between the grinding wheel 237 and the pipe body 12 and to absorb the debris generated at the grinding point in a timely manner.

[0040] The horizontal moving part 21 includes: a guide rail 211, a groove 212 is provided on one side of the guide rail 211, a pulley 213 is slidably connected to the groove 212, and a moving plate 214 is connected to one side of the pulley 213. The vertical moving part 22 includes: a first threaded rod 221, the bottom of the first threaded rod 221 is fixedly connected to the top of the moving plate 214, and the first threaded rod 221 is threadedly connected to an upper nut 223 and a lower nut 222.

[0041] The lifting component 23 includes: a support handle 231, a fixed rod 232 fixedly connected to one side of the support handle 231, a first connecting plate 233 fixedly connected to one end of the fixed rod 232, a first side plate 234 connected to the bottom edge of the first connecting plate 233, the top of the first connecting plate 233 fixedly connected to the fixed end of the motor 235, and the rotating end of the motor 235 connected to the grinding wheel 237 through the first rotating shaft 236.

[0042] The rotating component 24 includes: a second connecting plate 241 located directly below the first connecting plate 233; two symmetrically distributed second side plates 242 connected to the top edge of the second connecting plate 241; a second rotating shaft 243 disposed between the two second side plates 242; the two ends of the second rotating shaft 243 being fixedly connected to the side of the two second side plates 242 that are close to each other; a bottom rod 244 fixedly connected to the center of the bottom of the second connecting plate 241; a rotating wheel 245 connected to the side of the bottom rod 244; an outer cylinder 246 disposed outside the rotating wheel 245; the outer cylinder 246 being rotatably connected to the rotating wheel 245; and a lifting plate 247 fixedly connected to the bottom of the outer cylinder 246, the lifting plate 247 being located between the upper nut 223 and the lower nut 222.

[0043] The multi-position sleeve dust collection device 3 includes: a vacuum cleaner 31, the bottom of the vacuum cleaner 31 is fixedly connected to the top of the moving plate 214, the suction end of the vacuum cleaner 31 is connected to a pipe 32, the top end of the pipe 32 is connected to a positioning connector 34, the two ends of the positioning connector 34 are respectively connected to a dust collection fixing member 33 and a dust collection sleeve 35, and the dust collection fixing member 33 is connected to the fixed end of the motor 235.

[0044] The dust collection fixture 33 includes: an inclined box 331, which is located between the motor 235 and the tube 12. The angle between the inclined box 331 and the horizontal plane is 45-60°. Several extension plates 333 are fixedly connected to the side of the inclined box 331 near the motor 235. Each extension plate 333 is connected to a fixed foot 334 at one end. A round hole is opened through one side of the fixed foot 334. A second threaded rod 335 is slidably connected to the round hole. Several threaded holes are opened at the fixed end of the stepper motor 235. The second threaded rod 335 is threadedly connected to the threaded holes. A dust suction port 332 is opened at the bottom of the inclined box 331.

[0045] Metal shavings generated during grinding, under the influence of gravity, slide quickly down the inclined surface of the slanted box 331 to the bottom of the box, preventing accumulation in the working area of ​​the grinding wheel 237. The 45–60° angle ensures sufficient momentum for the shavings to slide down without causing the slanted box 331 opening to face upwards and for the shavings to bounce and splash, thus achieving directional collection of the shavings. Shavings will not get stuck between the grinding wheel 237 and the corners of the tube 12, ensuring the flatness of the corners of the tube 12 during grinding, and preventing the shavings from being repeatedly crushed by the grinding wheel 237 and scratching the surface of the tube 12, improving the quality of the finished product. The slanted box 331 acts as a barrier between the motor 235 and the grinding area, blocking splashing shavings and preventing them from entering the gaps at the fixed end of the motor 235 or inside the motor 235, thus avoiding wear and short circuits in the motor 235 components. It also reduces wear on the edges of the grinding wheel 237 caused by shavings, lowering the probability of chipping or failure of the grinding wheel 237. The tilt angle of the slant box 331 does not obstruct the operator's view of the grinding position, allowing a clear view of the grinding progress at the corners of the tube 12, facilitating real-time adjustment of the contact angle and pressure of the grinding wheel 237. Furthermore, the slant box 331, clamped between the motor 235 and the tube 12, has a compact structure, requiring no extra space whether used by hand or on a fixed frame, offering high operational flexibility. Debris is confined within the slant box 331, preventing it from scattering and causing injuries to the operator or slipping on the ground. After the work is completed, simply disassembling or emptying the slant box 331 allows for centralized disposal of debris, eliminating the need to clean scattered debris and equipment gaps, significantly reducing subsequent cleaning workload and making it suitable for batch grinding of the tube 12.

[0046] The positioning connector 34 includes: a bucket tube 341, one end of which is connected to one end of the inclined box 331, and the other end of which is connected to the nozzle 342. The inner wall of the nozzle 342 is fixedly connected with two inner arc plates 343 and a sealing pressure ring 346. The two inner arc plates 343 are located between the nozzle 342 and the sealing pressure ring 346. Several guide strips 344 are fixedly connected to the side of the inner arc plate 343 away from the nozzle 342. Each guide strip 344 has an insertion hole 345 on one side.

[0047] The inner diameter of the inner arc plate 343 is smaller than the diameter of the sealing ring 346. One side of the inner arc plate 343 is fixedly connected to the sealing ring 346. The sealing ring 346 is made of elastic rubber. The distances from the two inner arc plates 343 to the axis of the nozzle 342 are equal. The diameter of the end of the bucket tube 341 near the inclined box 331 is larger than the diameter of the end of the bucket tube 341 away from the inclined box 331. The suction port 332 passes through the bottom of the inclined box 331 and the bucket tube 341. The suction port 332 is connected to the suction pipe 347. The top of the pipe 32 is connected to the suction pipe 347.

[0048] The dust collection fitting 35 includes: a sleeve 351, located on one side of the inclined box 331, the sleeve 351 being formed by an arc plate and a bent plate, the arc plate being adapted to the arc surface of the tube body 12, the distance between the arc plate and the tube body 12 being 3-6 mm, a rubber insert 353 being fixedly connected to the arc surface of the bent plate near the end of the sleeve 351, a friction port 352 being provided through one side of the arc plate, the friction port 352 being an arc-shaped hole, the friction port 352 being located in the contact area between the tube body 12 and the grinding wheel 237, an end plate 354 being fixedly connected to one end of the sleeve 351, and several insert rods 355 being fixedly connected to one side of the end plate 354, each insert rod 355 Each rod 355 is fitted with a socket 345. The diameter of the inserted rubber sheet 353 is equal to the inner diameter of the sealing ring 346. The sleeve 351, the inclined box 331, the tubing 341, and the nozzle 342 are all made of transparent material. The diameter of the end of the tubing 341 near the inclined box 331 is larger than the diameter of the end of the tubing 341 away from the inclined box 331. The tubing 341 and the inclined box 331 form a suction pipe 347. The bottom edge of the suction pipe 347 is V-shaped. The lowest point of the connection between the tubing 341 and the inclined box 331 is the lowest point of the suction pipe 347. The suction port 332 is located at the lowest point of the suction pipe 347.

[0049] The curved plate and the curved surface of tube 12 are perfectly matched, with a gap of 3-6 mm that perfectly covers the side of the grinding area. Grinding debris won't fly out from the side; it can only flow into the inclined box 331, forming a closed enclosure with the inclined surface of 331, maximizing collection efficiency. This gap is just right; if it's less than 3 mm, the curved plate might rub against the surface of tube 12, causing scratches when tube 12 rotates or moves during grinding. If it's greater than 6 mm, there will be a large gap, and debris will still leak to the side. 3-6 mm ensures that the angle of tube 12 can be freely adjusted during grinding, without the curved plate touching the tube 12, thus maintaining grinding accuracy and preventing scratches. The curved plate's fit with the curved surface of tube 12 allows for quick alignment of the curved plate with the grinding area at the corners of tube 12 during operation, eliminating the need for repeated adjustments. This is especially suitable for beginners, reducing grinding deviations and improving the consistency of batch operations. The sleeve 351 blocks the side of the grinding area, preventing high-speed flying of fine metal shavings from splashing onto the hands or face. This provides more comprehensive protection than relying solely on the slanted box 331, making work more reassuring. The combination of the curved and bent plates eliminates the need for complex parts. It seamlessly integrates with the slanted box 331 and can be modified to accommodate different diameters of the tube body 12. With a few modifications, it can be used for grinding tube bodies 12 of various specifications, demonstrating strong versatility.

[0050] A grinding method for ductile iron jacking pipe production is applied to a grinding device for ductile iron jacking pipe production. The grinding position is determined, the dust collection fixing component 33 is rotated so that the inclined box 331 is positioned on the grinding side of the pipe body 12, and the dust collection fixing component 33 is fixed to the fixing end of the motor 235 as a whole. The base plate 11 is moved, and the grinding device 2 is moved in three dimensions so that the edge corner of the pipe body 12 passes through the friction port 352 and abuts against the grinding wheel 237. The sleeve 351 and the guide... The guide strip 344 is adapted, the sleeve 351 moves along the axis of the guide strip 344, the sleeve 351 and the insert rubber sheet 353 move toward the direction closer to the bucket tube 341, the insert rubber sheet 353 and the sealing strip come into contact with each other and are squeezed to form a sealing surface, the insert plate is inserted into the insertion hole 345, the dust collection sleeve 35 is connected to the dust collection fixing part 33 as a whole through the positioning connector 34, and the grinding wheel 237 is accommodated and the dust collection box body is formed on the grinding side of the grinding wheel 237.

[0051] When using this tool, based on the specific needs of the grinding operation on the tube 12, use measuring tools to clearly define the specific area to be ground on the tube 12 and mark the boundary lines of the grinding range. Move the dust collection fixing component 33 to the preset installation area between the motor 235 and the tube 12, ensuring that the inclined box 331 is positioned within the gap between the motor 235 and the tube 12, and that the suction port 332 of the inclined box 331 faces the tube 12. Using the relative position of the motor 235 and the tube 12 as a reference, slowly rotate the overall structure of the dust collection fixing component 33. During rotation, continuously observe the alignment of the suction port 332 of the inclined box 331 with the grinding area of ​​the tube 12. When the inclined box 331 is precisely positioned on the grinding side of the tube 12, the suction port 332 is completely aligned with the grinding area, and the angle between the inclined box 331 and the horizontal plane meets the requirement of 45-60°, the operator must hold the dust collection fixing component 33 to maintain its current posture to prevent positional shift during subsequent fixing. While keeping the dust collection fastener 33 in the same position, observe the several extension plates 333 on the side of the inclined box 331 near the motor 235, and adjust the position of the extension plates 333. The extension plates 333 are designed with a micro-adjustable structure so that the fixing feet 334 at the end of each extension plate 333 are precisely aligned with the pre-set threaded holes on the fixing end of the motor 235. It is necessary to ensure that the center of the circular hole of each fixing foot 334 is completely aligned with the center of the corresponding threaded hole, laying the foundation for the smooth installation of the second threaded rod 335. Pass the second threaded rod 335 through the circular holes on the fixing feet 334 one by one, rotate the threaded rod, so that the second threaded rod 335 enters the threaded hole and is initially tightened, realizing the pre-fixation of the dust collection fastener 33. In this step, it is necessary to ensure that all second threaded rods 335 are pre-installed to avoid uneven force on the fastener due to misalignment of individual threaded rods. According to the principle of symmetrical tightening, gradually tighten all second threaded rods 335. During the tightening process, the tightening force must be controlled to avoid stripping of the threads or deformation of the fixing foot 334 and the extension plate 333 due to excessive force.

[0052] The operator holds the support handle 231 of the lifting component 23 and, based on the horizontal position of the corner of the tube body 12, pushes the grinding device 2 as a whole to slide along the guide rail 211 of the horizontal moving component 21. The pulley 213 slides synchronously in the sliding groove 212, driving the moving plate 214, the vertical moving component 22, and the grinding wheel 237 above to move in a horizontal straight line until the grinding wheel 237 moves directly in front of the corner of the tube body 12 to be ground, completing the horizontal position calibration. After the grinding wheel 237 is horizontally aligned, the operator adjusts the vertical height of the grinding wheel 237 by rotating the upper nut 223 and the lower nut 222. If it is necessary to raise the grinding wheel 237, rotate the upper nut 223 clockwise and the lower nut 222 counterclockwise. The lifting plate 247 moves upward along the first threaded rod 221 under the clamping action of the two nuts, driving the rotating component 24, the lifting component 23, and the grinding wheel 237 to rise synchronously. If it is necessary to lower the grinding wheel 237, simply rotate the nuts in the opposite direction. Continue adjusting until the grinding surface of the grinding wheel 237 perfectly matches the vertical height of the corner of the tube body 12. For tilt angles or irregular contours of the corners of the tube body 12, the operator gently rotates the support handle 231, causing the lifting component 23 to rotate around the rotating component 24. Simultaneously, the outer cylinder 246 can be rotated to cause the base rod 244 to drive the rotating wheel 245 to rotate, achieving fine-tuning of the angle of the grinding wheel 237 in the horizontal rotation and pitch directions. This ensures that the grinding surface of the grinding wheel 237 is completely in contact with the contour of the corner of the tube body 12, avoiding grinding dead angles or over-grinding. After the position and angle of the grinding wheel 237 in the horizontal, vertical, and rotational directions are all adjusted to the correct position, and the grinding surface is in close contact with the corner of the tube body 12, check again whether the connecting parts are loose, and confirm that the grinding wheel 237 is not offset or wobbling.

[0053] Align the suction port 332 at the bottom of the inclined box 331 with the contact area between the grinding wheel 237 and the tube 12. Fix the vacuum cleaner 31 to the top of the moving plate 214 of the edge grinding device 2. Connect the top of the pipe 32 to the suction pipe 347. The suction pipe 347 must pass through the bottom of the inclined box 331 and the bottom of the bucket pipe 341 and be seamlessly connected to the suction port 332. Initially align the corner of the tube 12 with the position of the grinding wheel 237, leaving space for the installation of the dust collection sleeve 35, ensuring that the corner of the tube 12 can pass smoothly through the friction port 352 later. Holding the sleeve 351 of the dust collection sleeve 35, align the corner of the tube 12 to be ground with the friction port 352 on the arc plate of the sleeve 351, and slowly move the sleeve 351 to make the corner of the tube 12 pass through the friction port 352 until the corner of the tube 12 is completely in contact with the grinding wheel 237. At this point, the position of sleeve 351 needs to be adjusted to ensure that the arc plate matches the arc surface of the tube 12, and the distance between the arc plate and the tube 12 is controlled at 3-6 mm. This will not affect the positioning of the tube 12 and will reduce dust leakage from the gap. Observe the direction of the guide strip 344 inside the nozzle 342 of the positioning connector 34, and align the insertion rod 355 of the dust collection sleeve 35 with the axial direction of the guide strip 344, so that sleeve 351 and guide strip 344 are precisely matched. Then, slowly push sleeve 351 along the axial direction of guide strip 344, so that sleeve 351, along with the insertion rubber piece 353, moves towards the direction closer to the bucket tube 341. During the movement, sleeve 351 needs to be kept stable to avoid the insertion rod 355 from shifting and failing to be inserted into the insertion hole 345. Continue to push sleeve 351 until the insertion rubber piece 353 at one end of sleeve 351 contacts the sealing pressure ring 346 inside the nozzle 342 of the positioning connector 34. Continue applying uniform thrust to compress the elastic rubber insert 353 and the sealing ring 346 against each other, utilizing their elastic deformation to form a seamless sealing surface, preventing dust leakage from the joint. Simultaneously observe the alignment of the insert rod 355 and the insertion hole 345, ensuring that each insert rod 355 is accurately inserted into the corresponding insertion hole 345, completing the mechanical fixation of the dust collection sleeve 35 and the positioning connector 34. At this point, the dust collection sleeve 35 is connected to the dust collection fixing member 33 as a whole through the positioning connector 34. The sleeve 351, the inclined box 331, the bucket tube 341, and the nozzle 342 together form a closed space, accommodating the grinding wheel 237, and forming a complete dust collection box body on the grinding side of the grinding wheel 237. After installation, observe the internal state through the transparent component: confirm that the grinding wheel 237 is completely inside the dust collection box, the friction port 352 precisely covers the contact area between the tube 12 and the grinding wheel 237, and the suction port 332 is directly opposite the core location where grinding dust is generated. Turn on the power of the vacuum cleaner 31. The vacuum cleaner 31 generates negative pressure suction through the pipe 32 and the suction tube 347. The negative pressure is transmitted through the suction port 332 to the closed dust collection box, forming an airflow channel from the friction port 352, the grinding area to the suction port 332.The motor 235 of the edge grinding device 2 is started, driving the grinding wheel 237 to rotate at high speed. The operator holds the support handle 231 of the edge grinding device 2 and controls the grinding wheel 237 to move in three-axis directions to grind the edges and corners of the tube 12 passing through the friction port 352. The metal dust generated during grinding is quickly attracted to the dust suction port 332 under the action of negative pressure airflow and gravity, and enters the vacuum cleaner 31 through the suction pipe 347 and the pipe 32, achieving efficient dust collection. During the operation, the grinding progress and dust collection can be observed in real time through the transparent dust suction box. If dust is found to be escaping, the machine should be stopped immediately to check whether the sealing surface is loose or whether the sleeve 351 is misaligned. Adjustments should be made before continuing the operation.

[0054] The angle between the inclined box 331 and the horizontal plane is 45-60°. One end of the tubing 341 is connected to one end of the inclined box 331. The diameter of the tubing 341 near the inclined box 331 is larger than the diameter of the tubing 341 away from the inclined box 331. The tubing 341 and the inclined box 331 form a suction pipe 347. The bottom edge of the suction pipe 347 is V-shaped. The lowest point of the connection between the tubing 341 and the inclined box 331 is the lowest point of the suction pipe 347. The suction port 332 is located at the lowest point of the suction pipe 347. The inclined box 331 forms an angle of 45-60° with the horizontal plane. Combined with the V-shaped bottom structure formed by the tubing 341 and the inclined box 331, the dust generated by grinding will automatically slide to the lowest point of the V-shape under the action of gravity. The negative pressure airflow generated by the vacuum cleaner 31 also acts on the suction port 332, forming a dual driving force of gravity descent and airflow adsorption, preventing dust from accumulating in the inclined box 331 or the tube 341, and greatly improving the timeliness and thoroughness of dust collection. If the angle is too small, the dust will fall slowly and easily stick to the inner wall of the inclined box 331; if the angle is too large (>60°), it will reduce the internal space of the suction box, which may interfere with the grinding wheel 237 or the tube 12, affecting the grinding operation. The tapered structure of the tubing 341, with its large end connected to the inclined box 331 and its small end narrowing, enhances the concentration of negative pressure suction. The tubing 341 has a larger diameter at the end near the inclined box 331 and a smaller diameter at the end further away. This tapered design allows the negative pressure airflow generated by the vacuum cleaner 31 to converge within the tubing 341. As the airflow enters from the large-diameter end and flows towards the small-diameter end, its velocity increases, and the suction is concentrated on the area connected to the inclined box 331. This strengthens the dust adsorption capacity of the core polishing area and reduces the probability of dust escaping from gaps. Simultaneously, the connection between the large-diameter end and the inclined box 331 maximizes the coverage of the dust diffusion range generated by the grinding wheel 237. The narrowing of the small-diameter end facilitates precise docking with the nozzle 342 of the positioning connector 34, reducing the risk of air leakage in the overall device. The suction port 332 is located at the lowest point of the V-shape. The lowest point where the tubing 341 connects to the inclined box 331 is the only place where dust naturally accumulates. Placing the suction port 332 here directly targets this dust accumulation point. Whether dust falls due to gravity or is carried by airflow, it will be sucked in by the suction port 332 immediately, preventing dust residue from remaining inside the tube 12. The structure is compact, forming a closed suction system in conjunction with the dust-collecting fitting 35. The combination of the inclined box 331 and tubing 341 is small in size and can be precisely fitted into the gap between the motor 235 and the tube 12 without occupying excessive working space. Simultaneously, the small-diameter end of the tubing 341 can seamlessly connect with the nozzle 342 of the positioning connector 34, forming a complete closed suction box with the dust-collecting fitting 35. This completely encloses the grinding area of ​​the grinding wheel 237, achieving close-range closed-loop processing of dust generation and collection, significantly reducing the risk of dust escaping and polluting the environment.

[0055] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details have been described in detail in the above preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A chamfering apparatus for ductile cast iron pipe production, characterized in that, include: A rotating workpiece (13) is connected to a rotating shaft of a corner wheel (14). The corner wheel (14) is rotatably connected to a tube body (12). A grinding device (2) is attached to the corner of the tube body (12). The grinding device (2) is used to control the grinding wheel (237) to move in the three-axis direction and to grind the tube body (12) after it fits against it. The grinding device (2) includes: a horizontal moving part (21), a vertical moving part (22) connected above the horizontal moving part, a rotating part (24) rotatably connected above the vertical moving part (22), and a lifting part (23) connected to the top of the rotating part (24). A multi-position sleeve dust collection device (3) is sleeved on the outside of the grinding device (2). The multi-position sleeve dust collection device (3) is used to form a cover for the part outside the connection between the grinding wheel (237) and the tube body (12) and to absorb the debris generated at the grinding point in time. The multi-position sleeve dust collection device (3) includes: a vacuum cleaner (31), the bottom of the vacuum cleaner (31) is fixedly connected to the top of the moving plate (214), the suction end of the vacuum cleaner (31) is connected to a pipe (32), the top end of the pipe (32) is connected to a positioning connector (34), the two ends of the positioning connector (34) are respectively connected to a dust collection fixing component (33) and a dust collection sleeve (35), and the dust collection fixing component (33) is connected to the fixed end of the motor (235); The dust collection fixing component (33) includes: a slanted box (331), which is located between the motor (235) and the tube (12). The angle between the slanted box (331) and the horizontal plane is 45-60°. Several extension plates (333) are fixedly connected to the side of the slanted box (331) near the motor (235). Each extension plate (333) is connected to a fixed foot (334) at one end. A round hole is opened through one side of the fixed foot (334). A second threaded rod (335) is slidably connected to the round hole. Several threaded holes are opened at the fixed end of the stepper motor (235). The second threaded rod (335) is threadedly connected to the threaded holes. A dust suction port (332) is opened at the bottom of the slanted box (331). The positioning connector (34) includes: a bucket tube (341), one end of which is connected to one end of the inclined box (331), and the other end of which is connected to the nozzle (342). The inner wall of the nozzle (342) is fixedly connected with two inner arc plates (343) and a sealing pressure ring (346). The two inner arc plates (343) are located between the nozzle (342) and the sealing pressure ring (346). Several guide strips (344) are fixedly connected to the side of the inner arc plate (343) away from the nozzle (342). Each guide strip (344) has an insertion hole (345) on one side. The inner diameter of the inner arc plate (343) is smaller than the diameter of the sealing ring (346). One side of the inner arc plate (343) is fixedly connected to the sealing ring (346). The sealing ring (346) is made of elastic rubber. The distances from the two inner arc plates (343) to the axis of the nozzle (342) are equal. The diameter of the end of the bucket tube (341) near the inclined box (331) is larger than the diameter of the end of the bucket tube (341) away from the inclined box (331). The suction port (332) penetrates the bottom of the inclined box (331) and the bucket tube (341). The suction port (332) is connected to the suction pipe (347). The top of the pipe (32) is connected to the suction pipe (347). The dust collection sleeve (35) includes: a sleeve (351), which is located on one side of the inclined box (331). The sleeve (351) is formed by an arc plate and a bent plate. The arc plate is adapted to the arc surface of the tube body (12). The distance between the arc plate and the tube body (12) is 3-6 mm. An insert rubber sheet (353) is fixedly connected to the arc surface of the bent plate near one end of the sleeve (351). A friction port (352) is opened through one side of the arc plate. The friction port (352) is an arc-shaped hole. The friction port (352) is located in the contact area between the tube body (12) and the grinding wheel (237). An end plate (354) is fixedly connected to one end of the sleeve (351). Several rods (355) are fixedly connected to one side. Each rod (355) is matched with a socket (345). The diameter of the rubber sheet (353) is equal to the inner diameter of the sealing ring (346). The sleeve (351), the inclined box (331), the tubing (341), and the nozzle (342) are all made of transparent material. The tubing (341) and the inclined box (331) form a suction pipe (347). The bottom edge of the suction pipe (347) is V-shaped. The lowest point of the connection between the tubing (341) and the inclined box (331) is the lowest point of the suction pipe (347). The suction port (332) is located at the lowest point of the suction pipe (347).

2. The edge grinding equipment for producing ductile iron jacking pipes according to claim 1, characterized in that, The horizontal moving part (21) includes: a guide rail (211), a groove (212) is provided on one side of the guide rail (211), a pulley (213) is slidably connected to the groove (212), and a moving plate (214) is connected to one side of the pulley (213). The vertical moving part (22) includes: a first threaded rod (221), the bottom of the first threaded rod (221) is fixedly connected to the top of the moving plate (214), and the first threaded rod (221) is threadedly connected to an upper nut (223) and a lower nut (222).

3. The edge grinding equipment for producing ductile iron jacking pipes according to claim 1, characterized in that, The lifting component (23) includes: a support (231), a fixed rod (232) is fixedly connected to one side of the support (231), a first connecting plate (233) is fixedly connected to one end of the fixed rod (232), a first side plate (234) is connected to the bottom edge of the first connecting plate (233), the top of the first connecting plate (233) is fixedly connected to the fixed end of the motor (235), and the rotating end of the motor (235) is connected to the grinding wheel (237) through the first rotating shaft (236).

4. The edge grinding equipment for producing ductile iron jacking pipes according to claim 1, characterized in that, The rotating component (24) includes: a second connecting plate (241), which is located directly below the first connecting plate (233). Two symmetrically distributed second side plates (242) are connected to the top edge of the second connecting plate (241). A second rotating shaft (243) is provided between the two second side plates (242). The two ends of the second rotating shaft (243) are fixedly connected to the side of the two second side plates (242) respectively. A bottom rod (244) is fixedly connected to the center of the bottom of the second connecting plate (241). A rotating wheel (245) is connected to the side of the bottom rod (244). An outer cylinder (246) is provided outside the rotating wheel (245). The outer cylinder (246) is rotatably connected to the rotating wheel (245). A lifting plate (247) is fixedly connected to the bottom of the outer cylinder (246). The lifting plate (247) is located between the upper nut (223) and the lower nut (222).

5. A grinding method for producing ductile iron jacking pipes, applied to the grinding equipment for producing ductile iron jacking pipes as described in any one of claims 1-4, characterized in that: Determine the grinding position, rotate the dust collection fixing part (33) so that the inclined box (331) is located on the grinding side of the tube body (12), fix the dust collection fixing part (33) and the fixed end of the motor (235) into a whole, move the base plate (11) and move the grinding device (2) in three dimensions so that the edge corner of the tube body (12) passes through the friction port (352) and abuts against the grinding wheel (237), the sleeve (351) is adapted to the guide strip (344), and the sleeve (351) moves along the guide strip. The position bar (344) moves along the axis, the sleeve (351) and the insert rubber sheet (353) move toward the direction close to the bucket tube (341), the insert rubber sheet (353) and the sealing strip come into contact with each other and are squeezed to form a sealing surface, the insert plate is inserted into the insertion hole (345), the dust collection sleeve (35) is connected to the dust collection fixing part (33) as a whole through the positioning connector (34), the grinding wheel (237) is accommodated and the dust collection box body is formed on the grinding side of the grinding wheel (237).

Images