Large-diameter PE pipe welding equipment

Abstract

The present application relates to the technical field of pipeline fusion, in particular to a large-diameter PE pipeline fusion equipment. The equipment comprises an inner ring processing part for grinding the end inner ring of the pipeline body to form an inner groove, an outer ring processing part for grinding the end outer ring of the pipeline body to form an outer groove, and a fusion part for hot melting the ends of two pipeline bodies. The outer hot melting ring is used for hot melting the outer groove, and the inner hot melting ring is used for hot melting the inner groove. After hot melting, the outer groove and the inner groove are sleeved and tightly abutted, and the fusion part protrudes at both ends of the joint to form two sealing strips. After sleeving and tightly abutting, the fusion material is extruded and protrudes in the first sealing cavity and the second sealing cavity of the joint to form two annular sealing strips. This design forms at least two independent sealing barriers at the joint, significantly improves the sealing reliability of the connection, and effectively prevents fluid leakage.

Description

Technical Field

[0001] This invention relates to the field of pipe welding technology, specifically to a large-diameter PE pipe welding equipment. Background Technology

[0002] Large-diameter polyethylene (PE) pipes are widely used in urban water supply and drainage, gas transmission, and industrial fluid transport due to their excellent corrosion resistance, flexibility, and long service life. In pipeline laying projects, reliable connections between pipe sections are crucial for ensuring the sealing and structural strength of the entire pipeline system.

[0003] Currently, the connection of large-diameter PE pipes mainly adopts thermofusion butt welding technology. Traditional thermofusion butt welding typically involves heating and melting the end faces of two pipes, directly buttting them together, and applying pressure to fuse the molten materials. After cooling, a connection is formed. However, this flat-end butt welding method has some inherent drawbacks: First, the strength of the connection relies mainly on the mutual penetration and solidification of the molten materials at the end faces, resulting in relatively limited tensile and shear strength at the joint. This can be particularly problematic under internal pressure, external loads, or ground settlement, where the joint may become a weak point. Second, the sealing performance of the joint depends entirely on the complete fusion and uniformity of the molten materials, requiring extremely high control over the operating process (such as heating temperature, pressure, and time). Even slight deviations can easily lead to incomplete welding or insufficient fusion, resulting in leakage risks. Third, the irregular material accumulation at the joint formed by traditional methods can affect the flow characteristics of the fluid inside the pipe or cause inconvenience for subsequent pipe inspection operations.

[0004] Therefore, there is an urgent need in this field for a new type of welding equipment and method that can significantly improve the mechanical properties and sealing reliability of large-diameter PE pipe joints, while also taking into account construction convenience, efficiency and quality consistency. Summary of the Invention

[0005] To address the above problems, this invention provides a welding device for large-diameter PE pipes.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a large-diameter PE pipe welding equipment, including an inner ring processing part for grinding the inner ring of the end of the pipe body to form an inner groove, including a first fixed seat, a telescopic arm and a first grinding knife, the first fixed seat is cylindrical, the first fixed seat is equipped with a first drive motor, and the telescopic arm is connected between the first grinding knife and the first drive motor. The outer ring processing section is used to grind the outer ring of the end of the pipe body to form an outer groove. It includes a second fixed seat and a second grinding cutter. The second fixed seat is equipped with a second drive motor, which is used to drive the second grinding cutter to rotate. The fusion section is used to heat-melt the ends of the two pipe bodies, including a heat fusion plate, an outer heat fusion ring, and an inner heat fusion ring. The outer and inner heat fusion rings are connected to each other on both sides of the heat fusion plate. The outer heat fusion ring is used to heat-melt the outer groove, and the inner heat fusion ring is used to heat-melt the inner groove. After the heat fusion is completed, the outer groove and the inner groove are fitted together and pressed tightly. The fused part protrudes at both ends of the interface to form two sealing strips.

[0007] As an optimization, the first drive motor is coaxially arranged with the first fixed base, and the axis of the telescopic arm is arranged along the radial direction of the first fixed base. The telescopic arm is used to push the first grinding blade against the inner wall of the pipe body.

[0008] As an optimization, a first suction plate is provided on the side of the first fixed base facing the main body of the pipe. The first suction plate has a plurality of first suction holes in the direction of the first grinding knife. The first suction plate is equipped with a first suction fan. The first suction plate is coaxially arranged with the first fixed base.

[0009] As an optimization, the first grinding tool includes an integrally formed first horizontal section and a first inclined section. The first horizontal section is disposed adjacent to the first fixed base, and the end of the first inclined section away from the first horizontal section is inclined outward. The inner groove includes a first socket section and a first receiving section. The first horizontal section is formed by grinding the pipe body to form the first socket section, and the first inclined section is formed by grinding the pipe body to form the first receiving section. The first socket section and the first receiving section together form the inner groove. The diameter of the first receiving section gradually increases from the outside to the inside.

[0010] As an optimization, the bottom surface of the second fixing seat is arc-shaped, and the other end of the second fixing seat is equipped with a guide wheel. In use, the bottom surface of the second fixing seat is in contact with the outer side of the pipe body, while the guide wheel contacts the outer surface of the pipe body.

[0011] As an optimization, a second suction plate is provided on both sides of the second fixed base. The two second suction plates are respectively set on both sides of the second grinding blade. A second suction hole is opened on the lower side of the second suction plate. The second suction plate is connected to a second suction fan.

[0012] As an optimization, the second grinding blade is arranged parallel to the axis of the pipe body. The second grinding blade includes an integrally formed second horizontal section and a second inclined section. The second horizontal section is cylindrical, and the outer end of the second inclined section is inclined towards the outside of the axis of the second grinding blade. The second horizontal section grinds the main body of the pipe to form the second socket section, and the second inclined section grinds the main body of the pipe to form the second receiving section. The second socket section and the second receiving section form an external groove.

[0013] As an optimization, the first horizontal segment is sleeved on the outside of the second inclined segment, forming a first sealing cavity between the first horizontal segment and the second inclined segment. The first inclined segment is sleeved on the outside of the second horizontal segment, forming a second sealing cavity between the first inclined segment and the second horizontal segment. The two sealing strips are located inside the first sealing cavity and the second sealing cavity, respectively.

[0014] As an optimization, the pipe body is ground to create a mating side, which is then fused to the end of the adjacent pipe body.

[0015] The beneficial effects of this plan are as follows: The equipment processes specific inner and outer grooves at the ends of the two pipes to be connected, and after heat fusion, fits the pipe end with the outer groove onto the pipe end with the inner groove. This "nested inner and outer groove" structure forms an effective mechanical interlock at the interface, greatly enhancing the joint's resistance to axial pull-out and circumferential shear, making the overall mechanical performance of the pipe connection far exceed that of traditional flat-end butt joints; The specific shapes of the inner and outer grooves provide pre-defined spaces for the flow and redistribution of material after hot melting. This helps the molten material to fill and fuse more evenly and fully under pressure, avoiding problems such as uneven material accumulation or insufficient fusion that may occur in traditional joints, thus ensuring the density and uniformity of the internal structure of the interface. During the hot melting process, the outer and inner hot melting rings act on the outer and inner grooves respectively, causing the material within the grooves to melt. After the joint is tightened, the molten material is squeezed and protrudes at specific locations at both ends of the interface (i.e., the first sealing cavity and the second sealing cavity) to form two annular sealing strips. This design forms at least two independent sealing barriers at the interface, significantly improving the sealing reliability of the connection and effectively preventing fluid leakage, making it particularly suitable for high-pressure transportation or applications with stringent sealing requirements. Attached Figure Description

[0016] Figure 1 This is an axial view of the inner ring processing portion of the present invention.

[0017] Figure 2 This is a schematic diagram of the overall structure of the inner ring processing part of the present invention.

[0018] Figure 3 This is a schematic diagram of the inner ring processing portion of the present invention from the left.

[0019] Figure 4 For the present invention Figure 3 A schematic diagram of the BB cross-section structure.

[0020] Figure 5 This is a schematic diagram of the outer ring treatment portion of the present invention.

[0021] Figure 6This is a schematic diagram of the bottom axial side of the outer ring processing part of the present invention.

[0022] Figure 7 This is a front view schematic diagram of the outer ring processing part of the present invention.

[0023] Figure 8 This is a schematic diagram of the outer ring processing portion of the present invention from the left.

[0024] Figure 9 This is a left-side view of the outer ring processing section of the present invention in use.

[0025] Figure 10 For the present invention Figure 9 A schematic diagram of the CC cross-section structure.

[0026] Figure 11 This is a side view of the outer ring processing part of the present invention in use.

[0027] Figure 12 This is a schematic diagram of the axial side of the welded portion of the present invention.

[0028] Figure 13 This is a front view schematic diagram of the fusion section of the present invention in use.

[0029] Figure 14 This is an isometric view of the pipe body connection state of the present invention.

[0030] Figure 15 This is a left-side view of the connection state of the main pipe body of the present invention.

[0031] Figure 16 For the present invention Figure 15 A schematic diagram of the AA cross-section structure.

[0032] Figure 17 For the present invention Figure 16 A magnified structural diagram of part A.

[0033] Among them, 1. First fixed seat, 2. Telescopic arm, 3. First grinding blade, 4. First drive motor, 5. Second fixed seat, 6. Second grinding blade, 7. Second drive motor, 8. Hot melt plate, 9. Outer hot melt ring, 10. Inner hot melt ring, 11. Pipe body, 12. First suction plate, 13. First suction fan, 14. Guide wheel, 15. Second suction plate, 16. Second suction hole, 17. Second suction fan, 18. First sealing cavity, 19. Second sealing cavity. Detailed Implementation

[0034] like Figures 1-16As shown, a large-diameter PE pipe welding equipment includes an inner ring processing section for grinding the inner ring of the end of the pipe body 11 to form an inner groove. It includes a first fixed seat 1, a telescopic arm 2 and a first grinding blade 3. The first fixed seat 1 is cylindrical and is equipped with a first drive motor 4. The telescopic arm 2 is connected between the first grinding blade 3 and the first drive motor 4. The outer ring processing section is used to grind the outer ring of the end of the pipe body 11 to form an outer groove. It includes a second fixed seat 5 and a second grinding cutter 6. The second fixed seat 5 is equipped with a second drive motor 7, which is used to drive the second grinding cutter 6 to rotate. The fusion section is used to heat-melt the ends of the two pipe bodies 11, including a heat fusion plate 8, an outer heat fusion ring 9, and an inner heat fusion ring 10. The outer heat fusion ring 9 and the inner heat fusion ring 10 are connected to each other on both sides of the heat fusion plate 8. The outer heat fusion ring 9 is used to heat-melt the outer groove, and the inner heat fusion ring 10 is used to heat-melt the inner groove. After the heat fusion is completed, the outer groove and the inner groove are fitted together and pressed tightly. The molten part protrudes at both ends of the interface to form two sealing strips.

[0035] The nested inner and outer groove structure design achieves mechanical interlocking and multiple seals at pipe connections. The equipment has a compact overall structure, mainly composed of three modules: the inner ring treatment section, the outer ring treatment section, and the welding section. Each module can be operated independently or in concert, and it is suitable for on-site construction of PE pipes with a diameter of DN400 and above.

[0036] The outer ring processing section is used to grind a matching external groove on the outer wall of the pipe end. Its main body is the second fixed base 5, made of high-strength aluminum alloy. Its bottom surface is designed as an arc, the curvature of which matches the outer diameter of the target pipe to ensure a stable fit. A second drive motor 7 is mounted at one end of the second fixed base 5 to drive the second grinding cutter 6 to rotate at high speed. The other end is equipped with a guide wheel 14, made of polyurethane-coated rubber, which can roll on the outer surface of the pipe. Working together with the arc bottom surface, it ensures that the equipment moves stably and at a uniform speed along the circumference of the pipe, guaranteeing the machining accuracy of the external groove.

[0037] The welding section is crucial for completing the connection. Its core is the hot melt plate 8, made of thermally conductive aluminum alloy, with embedded high-power heating wires such as nickel-chromium alloy wire and temperature sensors (such as K-type thermocouples). The temperature is precisely controlled by an intelligent temperature controller (usually set at the melting temperature of the PE material). Two opposite sides of the hot melt plate 8 are connected to an outer hot melt ring 9 and an inner hot melt ring 10. The outer hot melt ring 9 fits into the outer ring and side surface of the outer groove formed by the second grinding blade 6, while the inner hot melt ring 10 fits into the inner groove formed by the first grinding blade 3. During hot melting, the outer hot melt ring 9 and the inner hot melt ring 10, heated to the set temperature, are inserted into and tightly adhered to their respective outer and inner grooves, causing the surface layer of PE material within the grooves to melt rapidly. The surfaces of the hot melt plate 8 and the hot melt rings are typically coated with a non-stick coating such as Teflon to prevent the molten material from sticking together.

[0038] like Figure 4 As shown, the first drive motor 4 is coaxially arranged with the first fixed base 1, and the axis of the telescopic arm 2 is arranged along the radial direction of the first fixed base 1. The telescopic arm 2 is used to push the first grinding knife 3 against the inner wall of the pipe body 11.

[0039] The core function of the inner ring processing section is to grind a specific-shaped internal groove on the inner wall of the pipe end. Its main body, the first fixed base 1, is cast from high-strength aluminum alloy (such as 6061-T6), is cylindrical, and features lightweight and high rigidity. A first drive motor 4, preferably a servo motor or a high-torque brushless DC motor (rated power 1.5kW, rated speed 3000rpm), is coaxially mounted at the center of the fixed base. Its output shaft is connected to the drive mechanism of the telescopic arm 2 via a coupling. The telescopic arm 2 uses an electrically or hydraulically driven linear module (e.g., 100mm stroke, 500N thrust), with its axis arranged radially along the first fixed base 1. A first grinding blade 3, made of high-speed tool steel or carbide tip, is fixed to the end of the telescopic arm 2. During operation, the first drive motor 4 drives the telescopic arm 2 and the first grinding blade 3 to rotate at high speed. Simultaneously, the telescopic arm 2 extends, stably pressing the rotating first grinding blade 3 against the inner wall of the pipe for grinding.

[0040] like Figures 1-4 As shown, a first suction plate 12 is arranged on the side of the first fixed base 1 facing the pipe body 11. The first suction plate 12 has a plurality of first suction holes in the direction of the first grinding knife 3. The first suction plate 12 is equipped with a first suction fan 13. The first suction plate 12 is coaxially arranged with the first fixed base 1.

[0041] To maintain cleanliness during operation, a first suction plate 12 is coaxially mounted on the side of the first fixed base 1 facing the pipe. This plate is annular or circular, made of ABS engineering plastic, and has multiple first suction holes evenly distributed on the side facing the grinding tool. The first suction plate 12 is connected to a first suction fan 13 through a pipe for real-time suction of plastic debris generated during grinding.

[0042] like Figures 1-4 As shown, the first grinding tool 3 includes an integrally formed first horizontal section and a first inclined section. The first horizontal section is disposed adjacent to the first fixed base 1, and the end of the first inclined section away from the first horizontal section is inclined outward. The inner groove includes a first connecting section and a first receiving section. The first horizontal section is ground on the pipe body 11 to form the first connecting section, and the first inclined section is ground on the pipe body 11 to form the first receiving section. The first connecting section and the first receiving section together form the inner groove. The diameter of the first receiving section gradually increases from the outside to the inside.

[0043] The first horizontal section, close to the first fixed seat 1, is used to grind out the first connecting section; the first inclined section is inclined outward (e.g., at an angle of 15-30 degrees to the axis) to grind out the first receiving section. Together, they constitute the inner groove. The diameter of the first receiving section gradually increases from the outside to the inside, forming a funnel-shaped transition zone.

[0044] like Figure 10 As shown, the bottom surface of the second fixing seat 5 is arc-shaped, and the other end of the second fixing seat 5 is equipped with a guide wheel 14. When in use, the bottom surface of the second fixing seat 5 is in contact with the outer side of the pipe body 11, and the guide wheel 14 is in contact with the outer surface of the pipe body 11.

[0045] When the second fixing seat 5 is fitted with the pipe body 11, the guide wheel 14 presses against the outer side of the pipe body 11. At the same time, the second fixing seat 5 is also equipped with a handle to facilitate operation of the second fixing seat 5.

[0046] like Figure 6 As shown, a second suction plate 15 is provided on both sides of the second fixed base 5. The two second suction plates 15 are respectively located on both sides of the second grinding blade 6. A second suction hole 16 is provided on the lower side of the second suction plate 15. The second suction plate 15 is connected to a second suction fan 17.

[0047] On both sides of the second grinding tool 6, two second suction plates 15 are symmetrically installed. They are made of stainless steel or aluminum alloy, and their lower sides have elongated second suction holes 16. The second suction plates 15 are connected to the second suction fan 17 through hoses to collect the debris generated during the grinding of the outer wall.

[0048] like Figure 10As shown, the second grinding blade 6 is arranged parallel to the axis of the pipe body 11. The second grinding blade 6 includes an integrally formed second horizontal section and a second inclined section. The second horizontal section is cylindrical, and the outer end of the second inclined section is inclined towards the outside of the axis of the second grinding blade 6. The second horizontal section grinds the pipe body 11 to form the second socket section, and the second inclined section grinds the pipe body 11 to form the second receiving section. The second socket section and the second receiving section form an external groove.

[0049] The cutting edge of the second grinding tool 6 is parallel to the pipe axis, and its structure also consists of a single-piece second horizontal section and a second inclined section. The second horizontal section is cylindrical and is used to grind the second connecting section; the outer end of the second inclined section is inclined outward from the axis (the inclination angle is complementary to that of the first inclined section) and is used to grind the second receiving section. Together, they form an external groove. The connection between the second horizontal section and the second inclined section is smooth, ensuring a clean grinding surface.

[0050] The cutting edge of the second grinding tool 6 is parallel to the pipe axis, and its structure also consists of a single-piece second horizontal section and a second inclined section. The second horizontal section is cylindrical and is used to grind the second connecting section; the outer end of the second inclined section is inclined outward from the axis (the inclination angle is complementary to that of the first inclined section) and is used to grind the second receiving section. Together, they form an external groove. The connection between the second horizontal section and the second inclined section is smooth, ensuring a clean grinding surface.

[0051] like Figure 16 and Figure 17 As shown, the first horizontal segment is sleeved on the outside of the second inclined segment, and a first sealing cavity 18 is formed between the first horizontal segment and the second inclined segment. The first inclined segment is sleeved on the outside of the second horizontal segment, and a second sealing cavity 19 is formed between the first inclined segment and the second horizontal segment. The two sealing strips are respectively located inside the first sealing cavity 18 and the second sealing cavity 19.

[0052] After the heat fusion is complete, quickly remove the heat fusion plate 8. Connect the two pre-grooved pipe ends: insert the pipe end with the external groove onto the pipe end with the internal groove and axially press it against it. Due to the precise fit of the grooves, two closed annular spaces are naturally formed at both ends of the joint, namely the first sealing cavity 18 and the second sealing cavity 19. Under axial pressure, the molten PE material in the two grooves is squeezed and mainly flows into these two sealing cavities. After cooling and solidification, it protrudes inside both ends of the joint to form two strong, continuous annular sealing strips. This structure achieves mechanical interlocking (preventing pull-out) and double sealing, greatly improving the joint performance.

[0053] The pipe body 11 is ground to create a mating side, which is then fused to the end of the adjacent pipe body 11.

[0054] After the inner and outer grooves are ground into the pipe body 11, its end face forms a flat mating side. This side face will also come into contact with the end face of the adjacent pipe during the heat fusion stage, and fuse under the action of heat fusion and pressure to form a basic end face weld layer, which together with the internal sealing strip constitutes a complete connection. When the two pipe bodies 11 are fitted together, they are fused together at the connection between the first horizontal section and the first inclined section, and at the connection between the second horizontal section and the second inclined section.

[0055] How to use: In practical use, the two large-diameter PE pipes to be connected are fixed to the docking machine or bracket, ensuring that their axes are aligned and their end faces are clean and flat. Check that all components of the equipment, including the grinding blade, heat fusion ring, and suction system, are in good working order, and that the power and air supply connections are normal.

[0056] The inner ring processing section is fed into the pipe from one end. The first suction fan 13 is started. The control unit is operated to extend the telescopic arm 2, pushing the first grinding blade 3 tightly against the inner wall of the pipe. The first drive motor 4 is started, driving the first grinding blade 3 to rotate at high speed, while simultaneously rotating or advancing the entire inner ring processing section slowly, causing it to move circumferentially along the inner wall of the pipe, grinding out a complete inner groove. Grinding debris is sucked away by the first suction plate 12 in real time. After completion, the telescopic arm 2 is retracted and the equipment is removed.

[0057] The arc-shaped bottom surface of the outer ring is attached to the outer wall of the other pipe end, so that the guide wheel 14 contacts the pipe wall. The second suction fan 17 is started. The second drive motor 7 is started to drive the second grinding blade 6 to rotate. The blade is pushed at a constant speed along the circumference of the pipe or driven by an automatic rotation device to grind out a complete outer groove. The debris is sucked away through the second suction hole 16.

[0058] Inspect and clean the processed inner and outer joints to ensure they are free of oil, water stains, and debris. Preheat the hot melt plate 8 of the fusion section by powering it on, and use a temperature controller to heat the outer hot melt ring 9 and inner hot melt ring 10 to the preset PE melting temperature, and maintain the temperature stable.

[0059] Carefully and completely slip the heated outer heat fusion ring 9 onto the end of the pipe with the external groove, ensuring full contact between the heat fusion ring and the groove wall for a certain period of time (the time is set according to the pipe specifications and wall thickness, usually several tens of minutes). Simultaneously, insert the inner heat fusion ring 10 into the end of the pipe with the internal groove and perform the same operation. This process melts the surface layer of the PE material inside the groove.

[0060] Quickly remove the hot melt tray 8 to prevent the material from cooling. Immediately align the two pipes along their axis, insert the pipe end with the external groove into the pipe end with the internal groove, and apply the specified axial mating pressure to ensure a tight seal between the two ends. Maintain this pressure until the molten material at the joint has completely cooled and solidified. During this process, the molten material is forced into the first sealing cavity 18 and the second sealing cavity 19, forming a double sealing strip.

[0061] After natural or assisted cooling to ambient temperature, release the welding pressure. Inspect the interface appearance; it should form a uniform, full fused flange (sealing strip), free from defects such as incomplete welds or cracks. Connection complete.

[0062] 1. First fixed seat 1; 2. Telescopic arm 2; 3. First grinding blade 3; 4. First drive motor 4; 5. Second fixed seat 5; 6. Second grinding blade 6; 7. Second drive motor 7; 8. Hot melt plate 8; 9. Outer hot melt ring 9; 10. Inner hot melt ring 10; 11. Pipe body 11; 12. First suction plate 12; 13. First suction fan 13; 14. Guide wheel 14; 15. Second suction plate 15; 16. Second suction hole 16; 17. Second suction fan 17; 18. First sealing cavity 18; 19. Second sealing cavity 19 How to use:

[0063] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product form and style of the above-described specific embodiments. Any large-diameter PE pipe welding equipment that conforms to the claims of the present invention, and any appropriate changes or modifications made to it by those skilled in the art, shall fall within the patent protection scope of the present invention.

Claims

1. A welding device for large-diameter PE pipes, characterized in that: The inner ring processing part is used to grind the inner ring of the end of the pipe body (11) to form an inner groove. It includes a first fixed seat (1), a telescopic arm (2) and a first grinding knife (3). The first fixed seat (1) is cylindrical and is equipped with a first drive motor (4). The telescopic arm (2) is connected between the first grinding knife (3) and the first drive motor (4). The outer ring processing section is used to grind the outer ring of the end of the pipe body (11) to form an outer groove. It includes a second fixed seat (5) and a second grinding blade (6). The second fixed seat (5) is equipped with a second drive motor (7). The second drive motor (7) is used to drive the second grinding blade (6) to operate. The fusion section is used to heat-melt the ends of the two pipe bodies (11), including a heat fusion plate (8), an outer heat fusion ring (9) and an inner heat fusion ring (10). The outer heat fusion ring (9) and the inner heat fusion ring (10) are connected to each other on both sides of the heat fusion plate (8). The outer heat fusion ring (9) is used to heat-melt the outer groove, and the inner heat fusion ring (10) is used to heat-melt the inner groove. After the heat fusion is completed, the outer groove and the inner groove are fitted together and pressed tightly. The molten part protrudes at both ends of the interface to form two sealing strips.

2. The large-diameter PE pipe welding equipment according to claim 1, characterized in that: The first drive motor (4) is coaxially arranged with the first fixed seat (1), and the axis of the telescopic arm (2) is arranged along the radial direction of the first fixed seat (1). The telescopic arm (2) is used to push the first grinding knife (3) against the inner wall of the pipe body (11).

3. The large-diameter PE pipe welding equipment according to claim 1, characterized in that: The first fixed base (1) is provided with a first suction plate (12) on the side facing the pipe body (11). The first suction plate (12) has a plurality of first suction holes in the direction facing the first grinding knife (3). The first suction plate (12) is provided with a first suction fan (13). The first suction plate (12) is coaxially arranged with the first fixed base (1).

4. The large-diameter PE pipe welding equipment according to claim 1, characterized in that: The first grinding tool (3) includes an integrally formed first horizontal section and a first inclined section. The first horizontal section is disposed adjacent to the first fixed base (1), and the end of the first inclined section away from the first horizontal section is inclined outward. The inner groove includes a first socket section and a first receiving section. The first horizontal section is ground on the pipe body (11) to form the first socket section, and the first inclined section is ground on the pipe body (11) to form the first receiving section. The first socket section and the first receiving section together form the inner groove. The diameter of the first receiving section gradually increases from the outside to the inside.

5. The large-diameter PE pipe welding equipment according to claim 1, characterized in that: The bottom surface of the second fixing seat (5) is arc-shaped, and the other end of the second fixing seat (5) is equipped with a guide wheel (14). When in use, the bottom surface of the second fixing seat (5) is in contact with the outer side of the pipe body (11), and the guide wheel (14) contacts the outer surface of the pipe body (11).

6. The large-diameter PE pipe welding equipment according to claim 1, characterized in that: The second fixed base (5) is provided with a second suction plate (15) on both sides. The two second suction plates (15) are respectively located on both sides of the second grinding knife (6). The second suction plate (15) has a second suction hole (16) on its lower side. The second suction plate (15) is connected to a second suction fan (17).

7. The large-diameter PE pipe welding equipment according to claim 6, characterized in that: The second grinding blade (6) is arranged parallel to the axis of the pipe body (11). The second grinding blade (6) includes an integrally formed second horizontal section and a second inclined section. The second horizontal section is cylindrical, and the outer end of the second inclined section is inclined towards the outside of the axis of the second grinding blade (6). The second horizontal section grinds the pipe body (11) to form the second socket section, and the second inclined section grinds the pipe body (11) to form the second receiving section. The second socket section and the second receiving section form an external groove.

8. The large-diameter PE pipe welding equipment according to claim 7, characterized in that: The first horizontal segment is sleeved on the outside of the second inclined segment, and a first sealing cavity (18) is formed between the first horizontal segment and the second inclined segment. The first inclined segment is sleeved on the outside of the second horizontal segment, and a second sealing cavity (19) is formed between the first inclined segment and the second horizontal segment. The two sealing strips are located inside the first sealing cavity (18) and the second sealing cavity (19), respectively.

9. The large-diameter PE pipe welding equipment according to claim 1, characterized in that: The pipe body (11) is ground to produce a mating side, which is fused to the end of the adjacent pipe body (11).

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