Portable hot-melt welding auxiliary device for small-bore PE pipe

Abstract

The utility model relates to water conservancy and hydropower engineering and municipal water supply and drainage engineering construction technical field, concretely for a kind of portable hot melting welding auxiliary device for small-bore PE pipe, including fixed base and the support base located in the side of fixed base, the upper surface of fixed base is fixedly installed with fixed turnover plate, the upper surface of support base is fixedly installed with support turnover plate, rotationally connected with intermediate turnover plate between support turnover plate and fixed turnover plate;The upper surface of fixed turnover plate is installed with fixed block, the upper surface of support turnover plate is installed with sliding block, the lower surface of sliding block is installed with sliding structure, and clamping structure is installed on fixed block and sliding block. Overcome the problem that manual butt joint small-bore PE pipe of operating personnel leads to axis centering not neat, easy to produce eccentric and misaligned, to fundamentally eliminate the welding quality defect and joint leakage risk caused by butt joint inaccuracy, improve butt joint welding quality, further, have the advantages that convenient to carry, reusable.

Description

Technical Field

[0001] This utility model relates to the field of construction technology for water conservancy and hydropower projects and municipal water supply and drainage projects, specifically a portable hot melt welding auxiliary device for small-diameter PE pipes. Background Technology

[0002] Small-diameter PE pipes (usually DN20-DN63) are widely used in underground water supply and drainage pipes for water conservancy and hydropower projects, as well as in the construction of extensive municipal pipe networks, due to their advantages such as corrosion resistance, good flexibility, and reliable connection. These pipes are generally connected by hot-melt socket or hot-melt butt welding to ensure the sealing and overall strength of the pipeline system.

[0003] However, in current construction practices, the installation of small-sized PE pipes relies heavily on manual operation, which presents challenges in ensuring alignment accuracy. Due to the small diameter of the PE pipes, workers typically need to manually support the two pipes to be connected and align them with the heating plate and welding clamps. Relying solely on visual observation and arm strength makes it difficult to ensure precise alignment of the two PE pipe axes, easily leading to issues such as eccentricity and misalignment. This misalignment significantly weakens the welding quality at the joint, resulting in incomplete welds and uneven fusion, becoming a potential hazard for future leaks or pipe bursts in the pipeline system.

[0004] Under current technology, the installation quality of small-sized PE pipes relies excessively on the technical skills and sense of responsibility of construction workers, resulting in problems such as unstable quality, low efficiency, and prominent safety hazards. This seriously affects the construction progress and the reliability of the overall project quality.

[0005] Therefore, it is necessary to invent a portable hot-melt welding auxiliary device for small-diameter PE pipes to solve the above problems, so as to achieve efficient, high-quality and inherently safe installation of small-sized PE pipes. Utility Model Content

[0006] To address the problem of difficulty in ensuring alignment accuracy during the installation of existing small-diameter PE pipes, this invention provides a portable hot-melt welding auxiliary device for small-diameter PE pipes.

[0007] This utility model is achieved using the following technical solution: A portable hot melt welding auxiliary device for small-diameter PE pipes includes a fixed base and a support base located next to the fixed base. A fixed flip plate is fixedly installed on the upper surface of the fixed base, and a support flip plate is fixedly installed on the upper surface of the support base. An intermediate flip plate is rotatably connected between the support flip plate and the fixed flip plate. A fixing block is installed on the upper surface of the fixed flip plate, a sliding block is installed on the upper surface of the supporting flip plate, a sliding structure is installed on the lower surface of the sliding block, and a clamping structure is installed on both the fixing block and the sliding block.

[0008] Furthermore, a rotating shaft is fixedly installed at the middle of the side end of both the supporting flip plate and the fixed flip plate, and two short rotating shafts arranged in a front-to-back manner are fixedly installed at both ends of the intermediate flip plate. The rotating shaft is located between two corresponding short rotating shafts, and a shaft rod is passed through the interior of the rotating shaft and the two corresponding short rotating shafts.

[0009] Furthermore, the sliding structure includes two side sliders fixedly installed on the lower surface of the sliding block and distributed in a front-to-back manner. The supporting flip plate is located between the two side sliders. A protruding strip is integrally fixed on the side of the side slider near the supporting flip plate. Sliding grooves are opened on the side end faces of the supporting flip plate and the middle flip plate, and the protruding strip is engaged in the sliding groove.

[0010] Furthermore, an installation block is fixed to the upper surface of the fixed flip plate, and a placement groove is opened on the upper surface of the installation block. A bearing is installed in the placement groove, the inner ring of the bearing is fixed to the inner bottom wall of the placement groove, and the outer ring of the bearing is fixedly connected to the fixed block. The lower surface of the fixing block has two blind holes distributed from left to right. The upper surface of the fixing flip plate has a threaded hole that runs vertically through the blind holes. A fixing screw is threaded through the threaded hole from bottom to top, and the upper part of the fixing screw is located in one of the blind holes.

[0011] Furthermore, the clamping structure includes two fixed clamping plates fixedly installed on the upper surface of the fixed block or the sliding block and distributed left and right. The fixed block or the sliding block has an installation groove. An adjusting clamping plate is movably installed in the installation groove and is arranged opposite to the fixed clamping plates. Two longitudinally arranged limiting rods are slidably passed through the bottom of the adjusting clamping plate. Both ends of the two limiting rods are fixedly connected to the side wall of the installation groove. A longitudinally arranged adjusting screw is threaded through the middle of the bottom end of the adjusting clamping plate. One end of the adjusting screw is rotatably connected to the side wall of the installation groove, and the other end passes through the side wall of the installation groove and is fixedly installed with an adjusting knob.

[0012] Furthermore, when both the end of the supporting flip plate and the end of the fixed flip plate are folded upward around one end of the intermediate flip plate, the adjusting clamping piece on the supporting flip plate is located between the two fixed clamping pieces on the fixed flip plate, and the adjusting clamping piece on the fixed flip plate is located between the two fixed clamping pieces on the supporting flip plate.

[0013] Furthermore, magnetic blocks are provided on the surfaces where the supporting flip plate and the intermediate flip plate are in contact with each other, and on the surfaces where the fixed flip plate and the intermediate flip plate are in contact with each other.

[0014] Furthermore, the surface of the fixed clamping piece near the adjusting clamping piece is arc-shaped, and Teflon metal sheets are installed on the surfaces of the fixed clamping piece and the adjusting clamping piece that are close to each other.

[0015] Furthermore, handles are fixedly installed on the side ends of both the fixed block and the sliding block.

[0016] The present invention has a reasonable and reliable structural design and has the following beneficial effects; 1. A portable hot melt welding auxiliary device for small-diameter PE pipes, wherein both the supporting flip plate and the fixed flip plate can be flipped upward along the end of the middle flip plate to form a U-shaped fold in space. At the same time, the two sets of clamping structures on it can be placed between the supporting flip plate and the fixed flip plate for interlocking placement. This device is not only convenient to carry and does not take up space, but also protects the clamping structures from collisions during transportation.

[0017] 2. A portable hot melt welding auxiliary device for small-diameter PE pipes, which realizes the centering and clamping of small-diameter PE pipes through a clamping structure, and realizes the displacement of sliding blocks through a sliding structure, so that the clamping structure on the sliding block can move towards the clamping structure on the fixed block, thereby bringing the small-diameter PE pipes on the two sets of clamping structures closer to each other and connecting them, which facilitates subsequent hot melt welding.

[0018] 3. A portable hot melt welding auxiliary device for small-diameter PE pipes, which realizes the fixing and rotation of the fixing block through the mounting block, bearing, blind hole, threaded hole and fixing screw, thereby realizing the conversion of the clamping structure into two states in the two different situations of unfolding and folding in this utility model.

[0019] 4. This utility model overcomes the problems of misalignment of the axis and easy occurrence of eccentricity and misalignment caused by manual connection of small-diameter PE pipes by operators, thereby fundamentally eliminating welding quality defects and joint leakage risks caused by inaccurate connection, improving the quality of butt welding, and further having the advantages of being convenient to carry and reusable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model during butt hot melt welding.

[0021] Figure 2 This is a schematic diagram of the present invention when unfolded.

[0022] Figure 3 This is a schematic diagram of the folded state of this utility model during storage and transportation.

[0023] Figure 4 This is a schematic diagram of the clamping structure in this utility model.

[0024] Figure 5 This is a bottom view of the fixing block in this utility model.

[0025] In the diagram: 1-Fixed base, 2-Supporting base, 3-Fixed flip plate, 4-Supporting flip plate, 5-Middle flip plate, 6-Fixed block, 7-Sliding block, 8-Rotating shaft, 9-Short rotating shaft, 10-Shaft rod, 11-Side slider, 12-Sliding groove, 13-Mounting block, 14-Blind hole, 15-Threaded hole, 16-Fixed screw, 17-Fixed clamping piece, 18-Mounting groove, 19-Adjusting clamping piece, 20-Limiting rod, 21-Adjusting screw, 22-Adjusting knob, 23-Magnetic block, 24-Teflon metal sheet, 25-Handle. Detailed Implementation

[0026] A portable hot melt welding auxiliary device for small-diameter PE pipes, as shown in the attached document. Figure 1 ~Appendix Figure 5 As shown, it includes a fixed base 1 and a support base 2 located next to the fixed base. A fixed flip plate 3 is fixedly installed on the upper surface of the fixed base 1, and a support flip plate 4 is fixedly installed on the upper surface of the support base 2. An intermediate flip plate 5 is rotatably connected between the support flip plate 4 and the fixed flip plate 3. A fixing block 6 is installed on the upper surface of the fixed flip plate 3, a sliding block 7 is installed on the upper surface of the supporting flip plate 4, a sliding structure is installed on the lower surface of the sliding block 7, and a clamping structure is installed on both the fixing block 6 and the sliding block 7.

[0027] In this invention, both the supporting flip plate 4 and the fixed flip plate 3 can be flipped upwards along the end of the middle flip plate 5 to form a U-shaped fold in space. At the same time, the two sets of clamping structures on them can be placed between the supporting flip plate 4 and the fixed flip plate 3, which is not only convenient to carry and does not take up space, but also protects the clamping structure from collision during transportation.

[0028] When the supporting flip plate 4, the intermediate flip plate 5, and the fixed flip plate 3 are on the same horizontal line, i.e. in the unfolded state, the two sets of clamping structures clamp two small-diameter PE pipes respectively. The sliding structure drives the clamping structure on the sliding block 7 to move towards the clamping structure on the fixed block 6, so that the small-diameter PE pipes on the two sets of clamping structures come closer to each other and connect, which facilitates the subsequent hot melt welding operation.

[0029] As attached Figure 2 Appendix Figure 3 As shown, a rotating shaft 8 is fixedly installed at the middle of the side end of both the supporting flip plate 4 and the fixed flip plate 3. Both ends of the intermediate flip plate 5 are fixedly installed with rotating short shafts 9 arranged in a front-to-back manner. The rotating shaft 8 is located between two corresponding rotating short shafts 9, and a shaft rod 10 is passed through the interior of the rotating shaft 8 and the two corresponding rotating short shafts 9.

[0030] In this utility model, the structural design of the rotating shaft 8, the short rotating shaft 9, and the shaft 10 realizes the rotational connection between the supporting flip plate 4 and the intermediate flip plate 5, and the rotational connection between the fixed flip plate 3 and the intermediate flip plate 5, so that both the supporting flip plate 4 and the fixed flip plate 3 can flip upward along the end of the intermediate flip plate 5 to form a U-shaped folding shape.

[0031] As attached Figure 1 As shown, the sliding structure includes two side sliders 11 fixedly installed on the lower surface of the sliding block 7 and distributed in a front-to-back manner. The supporting flip plate 4 is located between the two side sliders 11. The side sliders 11 are integrally fixed with protrusions on the side near the supporting flip plate 4. The side end faces of the supporting flip plate 4 and the intermediate flip plate 5 are both provided with sliding grooves 12, and the protrusions are engaged in the sliding grooves 12.

[0032] In this utility model, the structural design of the side slider 11, the protrusion and the sliding groove 12 realizes the displacement of the sliding block 7, so that the clamping structure on the sliding block 7 can move to the clamping structure on the fixed block 6, thereby making the small diameter PE pipes on the two sets of clamping structures approach each other and connect, which facilitates subsequent hot melt welding.

[0033] As attached Figure 3 Appendix Figure 5 As shown, an installation block 13 is fixed on the upper surface of the fixed flip plate 3. An installation groove is provided on the upper surface of the installation block 13. A bearing is installed in the installation groove. The inner ring of the bearing is fixed to the inner bottom wall of the installation groove, and the outer ring of the bearing is fixedly connected to the fixed block 6. The lower surface of the fixing block 6 has two blind holes 14 distributed from left to right. The upper surface of the fixing flip plate 3 has a threaded hole 15 that runs vertically through and matches the blind holes 14. A fixing screw 16 is threaded through the threaded hole 15 from bottom to top, and the upper part of the fixing screw 16 is located in one of the blind holes 14.

[0034] In this utility model, the mounting block 13 provides mounting space for the bearing. The installation of the bearing allows the fixing block 6 to rotate 180°, and the clamping structure on the fixing block 6 can also rotate 180°. In order to ensure the accuracy of the connection of the small-diameter PE pipe during the connection process when the present invention is unfolded, the fixing clamping piece 17 on the fixing block 6 and the fixing clamping piece 17 on the sliding block 7 need to be on the same side and horizontally aligned. Then, the adjusting clamping piece 19 on the fixing block 6 and the adjusting clamping piece 19 on the sliding block 7 are adjusted to clamp the small-diameter PE pipe.

[0035] When it is necessary to fold upwards, screw the fixing screw 16 so that the upper part of the fixing screw 16 disengages from the blind hole 14, releasing the fixing block 6 from the fixing connection. Then, rotate the fixing block 6 together with the clamping structure on it 180° so that the fixing clamping piece 17 on the fixing block 6 and the adjusting clamping piece 19 on the sliding block 7 are on the same side. In this way, the clamping structure on the fixing block 6 and the clamping structure on the sliding block 7 are interlocked after being flipped upwards, reducing space and making it easy to carry.

[0036] As attached Figure 4 As shown, the clamping structure includes two fixed clamping plates 17 fixedly installed on the upper surface of the fixed block 6 or the sliding block 7 and distributed in a left-right manner. The fixed block 6 or the sliding block 7 is provided with an installation groove 18. An adjusting clamping plate 19 is movably installed in the installation groove 18 and is arranged opposite to the fixed clamping plate 17. Two longitudinally arranged limiting rods 20 are slidably passed through the bottom of the adjusting clamping plate 19. Both ends of the two limiting rods 20 are fixedly connected to the side wall of the installation groove 18. A longitudinally arranged adjusting screw 21 is threaded through the middle of the bottom end of the adjusting clamping plate 19. One end of the adjusting screw 21 is rotatably connected to the side wall of the installation groove 18, and the other end passes through the side wall of the installation groove 18 and is fixedly installed with an adjusting knob 22.

[0037] In this invention, two fixed clamping plates 17 and one adjusting clamping plate 19 are arranged in a triangle. The end of the small-diameter PE pipe is placed between the fixed clamping plate 17 and the adjusting clamping plate 19. Then, the adjusting knob 22 is turned to drive the adjusting screw 21 to rotate, thereby driving the adjusting clamping plate 19 to move horizontally towards the fixed clamping plate 17, thereby clamping the small-diameter PE pipe.

[0038] As attached Figure 3 As shown, when the ends of the supporting flip plate 4 and the fixed flip plate 3 are both folded upward around one end of the intermediate flip plate 5, the adjusting clamping piece 19 on the supporting flip plate 4 is located between the two fixed clamping pieces 17 on the fixed flip plate 3, and the adjusting clamping piece 19 on the fixed flip plate 3 is located between the two fixed clamping pieces 17 on the supporting flip plate 4.

[0039] Magnetic blocks 23 are provided on the surfaces where the supporting flip plate 4 and the intermediate flip plate 5 are in contact with each other, and on the surfaces where the fixing flip plate 3 and the intermediate flip plate 5 are in contact with each other.

[0040] In this utility model, the structural design of the magnetic block 23 realizes the fixed connection between the supporting flip plate 4 and the intermediate flip plate 5, and the fixed flip plate 3 and the intermediate flip plate 5. When it needs to be unfolded, the two adjacent magnetic blocks 23 attract each other, ensuring that the supporting flip plate 4, the intermediate flip plate 5 and the fixed flip plate 3 are located on the same horizontal plane, avoiding slight displacement of small-diameter PE pipes during the butt joint and welding process.

[0041] As attached Figure 1 As shown, the surface of the fixed clamping piece 17 near the adjusting clamping piece 19 is arc-shaped, and Teflon metal sheets 24 are installed on the surfaces of the fixed clamping piece 17 and the adjusting clamping piece 19 that are close to each other.

[0042] In this invention, the Teflon metal sheet 24 (i.e., polytetrafluoroethylene) material has the characteristics of high temperature resistance (can withstand 260℃ for a long time), low coefficient of friction (non-stick) and low thermal conductivity.

[0043] The Teflon metal sheet 24 directly faces the molten tube end that is heated to over 200°C, and its high-temperature resistance ensures that it is not damaged; its non-stick properties prevent the molten PE tube material from sticking to the fixed clamping plate 17 or the adjusting clamping plate 19, ensuring the cleanliness and long-term usability of this invention; its low thermal conductivity effectively blocks the transfer of heat to the clamping structure and subsequent operating components, preventing heat from being rapidly conducted to the operating handle.

[0044] As attached Figure 1 As shown, handles 25 are fixedly installed on the side ends of the fixed block 6 and the sliding block 7.

[0045] The handle 25 makes it easy to carry and transport.

[0046] When transporting and carrying this utility model, the end of the supporting flip plate 4 and the end of the fixed flip plate 3 are first folded upward around one end of the middle flip plate 5, so that the adjusting clamping piece 19 on the supporting flip plate 4 is located between the two fixed clamping pieces 17 on the fixed flip plate 3, and the adjusting clamping piece 19 on the fixed flip plate 3 is located between the two fixed clamping pieces 17 on the supporting flip plate 4. At this time, the clamping structure on the fixed block 6 and the clamping structure on the sliding block 7 are interlocked after being flipped upward, reducing space and making it convenient to carry.

[0047] When the present invention is used for hot-melting, the supporting flip plate 4 and the fixed flip plate 3 are first unfolded, and the magnetic blocks 23 on them attract each other, so that the supporting flip plate 4, the intermediate flip plate 5 and the fixed flip plate 3 are on the same horizontal plane.

[0048] Then, tighten the fixing screw 16 so that the upper part of the fixing screw 16 disengages from the blind hole 14, releasing the fixing block 6 from the fixing connection. Then, rotate the fixing block 6 together with the clamping structure on it by 180° so that the fixing clamping piece 17 on the fixing block 6 and the adjusting clamping piece 19 on the sliding block 7 are on the same side. Then, tighten the fixing screw 16 so that the upper part of the fixing screw 16 enters the blind hole 14, fixing the fixing block 6 in place.

[0049] Next, place the ends of the two small-diameter PE pipes between the fixed clamping plate 17 and the adjusting clamping plate 19 located at both ends, and then turn the adjusting knob 22 to rotate the adjusting screw 21, thereby causing the adjusting clamping plate 19 to move horizontally towards the fixed clamping plate 17, thus clamping the small-diameter PE pipes.

[0050] Then the operator pushes the sliding block 7, so that the protrusion on the side slider 11 can move along the sliding groove 12, thereby allowing the small-diameter PE pipe located on the sliding block 7 to move towards the small-diameter PE pipe on the fixed block 6, so that they approach each other and connect, and then perform hot-melt welding of the two small-diameter PE pipes.

[0051] This invention uses mechanical rigidity to forcibly restrict and coincide the axes of two small-diameter PE pipes to be welded, which are respectively clamped by the clamping structure, onto the reference axis of the clamping structure. This can eliminate human error, improve welding quality, and fundamentally avoid axis offset and misalignment (steps) caused by hand shaking and uneven force during manual support.

[0052] At the same time, precise alignment ensures that the entire small-diameter PE pipe is installed straight, reducing fluid local resistance loss and internal pipe stress caused by initial installation deviation.

[0053] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable hot-melt welding auxiliary device for small-diameter PE pipes, characterized in that: It includes a fixed base (1) and a support base (2) located next to the fixed base. A fixed flip plate (3) is fixedly installed on the upper surface of the fixed base (1), and a support flip plate (4) is fixedly installed on the upper surface of the support base (2). An intermediate flip plate (5) is rotatably connected between the support flip plate (4) and the fixed flip plate (3). A fixing block (6) is installed on the upper surface of the fixed flip plate (3), a sliding block (7) is installed on the upper surface of the supporting flip plate (4), a sliding structure is installed on the lower surface of the sliding block (7), and a clamping structure is installed on both the fixing block (6) and the sliding block (7).

2. The portable hot-melt welding auxiliary device for small-diameter PE pipes according to claim 1, characterized in that: The supporting flip plate (4) and the fixed flip plate (3) are both fixedly installed with rotating shafts (8) at the middle of their side ends. The two ends of the intermediate flip plate (5) are both fixedly installed with rotating short shafts (9) arranged in a front-to-back manner. The rotating shaft (8) is located between the two corresponding rotating short shafts (9), and the rotating shaft (8) and the two corresponding rotating short shafts (9) are both provided with shaft rods (10).

3. The portable hot-melt welding auxiliary device for small-diameter PE pipes according to claim 2, characterized in that: The sliding structure includes two side sliders (11) fixedly installed on the lower surface of the sliding block (7) and distributed in a front-to-back manner. The supporting flip plate (4) is located between the two side sliders (11). The side sliders (11) are integrally fixed with a protrusion on the side near the supporting flip plate (4). The side end faces of the supporting flip plate (4) and the middle flip plate (5) are provided with sliding grooves (12), and the protrusion is engaged in the sliding groove (12).

4. The portable hot-melt welding auxiliary device for small-diameter PE pipes according to claim 1, characterized in that: The upper surface of the fixed flip plate (3) is fixed with an installation block (13), and the upper surface of the installation block (13) is provided with a placement groove. A bearing is installed in the placement groove, the inner ring of the bearing is fixed to the inner bottom wall of the placement groove, and the outer ring of the bearing is fixedly connected to the fixed block (6). The lower surface of the fixing block (6) has two blind holes (14) distributed in the left and right directions. The upper surface of the fixing flip plate (3) has a threaded hole (15) that runs through the top and bottom and matches the blind holes (14). A fixing screw (16) is threaded through the threaded hole (15) from bottom to top, and the upper part of the fixing screw (16) is located in one of the blind holes (14).

5. The portable hot-melt welding auxiliary device for small-diameter PE pipes according to claim 1, characterized in that: The clamping structure includes two fixed clamping plates (17) fixedly installed on the upper surface of the fixed block (6) or the sliding block (7) and distributed in a left-right manner. The fixed block (6) or the sliding block (7) is provided with an installation groove (18). An adjusting clamping plate (19) is movably installed in the installation groove (18) and is opposite to the fixed clamping plate (17). Two longitudinally arranged limiting rods (20) are slidably passed through the bottom of the adjusting clamping plate (19). Both ends of the two limiting rods (20) are fixedly connected to the side wall of the installation groove (18). A longitudinally arranged adjusting screw (21) is threaded through the middle of the bottom end of the adjusting clamping plate (19). One end of the adjusting screw (21) is rotatably connected to the side wall of the installation groove (18), and the other end passes through the side wall of the installation groove (18) and is fixedly installed with an adjusting knob (22).

6. The portable hot-melt welding auxiliary device for small-diameter PE pipes according to claim 5, characterized in that: When the end of the supporting flip plate (4) and the end of the fixed flip plate (3) are both folded upward around one end of the middle flip plate (5); the adjusting clamping piece (19) on the supporting flip plate (4) is located between the two fixed clamping pieces (17) on the fixed flip plate (3), and the adjusting clamping piece (19) on the fixed flip plate (3) is located between the two fixed clamping pieces (17) on the supporting flip plate (4).

7. The portable hot-melt welding auxiliary device for small-diameter PE pipes according to claim 1, characterized in that: Magnetic blocks (23) are provided on the surfaces where the supporting flip plate (4) and the intermediate flip plate (5) fit together, and on the surfaces where the fixing flip plate (3) and the intermediate flip plate (5) fit together.

8. A portable hot-melt welding auxiliary device for small-diameter PE pipes according to claim 6, characterized in that: The fixed clamping piece (17) is arranged in an arc shape on the surface near the adjusting clamping piece (19), and Teflon metal sheets (24) are installed on the surfaces of the fixed clamping piece (17) and the adjusting clamping piece (19) that are close to each other.

9. The portable hot-melt welding auxiliary device for small-diameter PE pipes according to claim 1, characterized in that: Handles (25) are fixedly installed on the side ends of the fixed block (6) and the sliding block (7).

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