Drainage PE pipeline hot melting connecting device and connecting method

Abstract

The invention provides a drainage PE pipeline hot melting connecting device and method, and relates to the technical field of pipeline welding. The pair of side frames are rotatably arranged on the two sides of the base frame in the vertical direction respectively; the rotating frame is horizontally hinged to the side frame; the fixing pieces are arranged on the rotating frames on the two sides, and the fixing pieces on the two sides are used for clamping and fixing the to-be-butted pipelines on the corresponding sides correspondingly; the first driving part is arranged on the base frame and is used for synchronously driving the pair of side frames to rotate in opposite directions; the second driving part is arranged on the side frame and used for driving the rotating frame to swing up and down around the hinge shaft of the rotating frame and achieving position locking after swinging. The large-diameter PE pipeline can be controllably bent in limited operation spaces such as a groove, so that pipe ends are smoothly butted, and the safety of the bending process and the stability of a connecting posture are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline welding, in particular to a drainage PE pipeline hot melt connecting device and connecting method. BACKGROUND

[0002] In the process of municipal drainage engineering or related underground pipeline construction, polyethylene (PE) drainage pipeline is widely used due to its corrosion resistance, light weight and convenient construction. When the pipeline is damaged in construction, use or accident, the damaged part needs to be cut off and then connected and repaired by hot melting. The existing repair process generally includes: first, cutting off a long pipe section on both sides of the damaged part to ensure that the damaged part is completely removed and a regular end face is obtained; then, preparing a new pipe section with the same length as the cut-off length, and completing the connection through two hot melt joints.

[0003] In the traditional operation mode, the construction personnel usually hot melt weld a joint on the replaced new pipe section first, and then weld the joint with the end of the pipeline to be connected. Then, the second joint is welded on the end of the original pipeline on the other side, and the replaced new pipe section is inserted into the joint on the corresponding side, so that the two connected pipeline sections are aligned. However, due to the need to insert the new pipe section into the joint, simply relying on alignment and pushing cannot completely insert the pipe end into the joint, and the pipe needs to be bent at a certain angle, so that part of the excess is "released" after bending deformation, so that the pipe end is inserted into position and subsequent hot melt welding is performed.

[0004] However, in actual municipal drainage construction sites, the length of the trench formed by excavation is often limited by roads, ground structures and underground pipelines, and the trench operation space is generally small. At the same time, the diameter of the PE pipeline for drainage is usually large, and the pipe wall has a certain rigidity, so it is difficult for the construction personnel to achieve effective bending by relying on manual labor. If conventional crowbars, wrenches and other general tools are used, not only is it difficult to generate enough bending moment, but also it may cause pipe wall indentation, surface damage or new hidden dangers, resulting in low repair efficiency and the risk of secondary damage. SUMMARY

[0005] The present application aims to provide a drainage PE pipeline hot melt connecting device and connecting method, which can implement controllable bending of large-diameter PE pipelines in limited operation spaces such as trenches, so that the pipe end is successfully connected, and the safety of the bending process and the stability of the connection posture are ensured.

[0006] In a first aspect, the present application is implemented by the following technical solutions: A drainage PE pipeline hot melt connecting device, comprising: a base frame; a side frame, the side frame is a pair, respectively arranged on both sides of the base frame in vertical direction and rotatable. a rotating frame horizontally hinged to the side frames; a fixing member arranged on the rotating frame on both sides and used for clamping and fixing the corresponding side of the pipe to be connected; a first driving member arranged on the base frame and used for synchronously driving a pair of the side frames to rotate in opposite directions; a second driving member arranged on the side frame and used for driving the rotating frame to swing up and down around the hinge shaft and realize position locking after swinging;

[0007] Further, the rotating frame comprises a guide portion, the fixing member is slidingly arranged on the guide portion, the guide portion is provided with a limiting structure, and the limiting structure is used for fixing the position of the fixing member after the fixing member slides along the guide portion; Further, the positions of the side frames rotating on the base frame are located at the edge positions where the side frames are away from each other, and the positions of the rotating frames rotating on the side frames are also located at the edge positions where the side frames are away from each other.

[0008] Further, the fixing member is provided with at least one pair of guide portions in the guide direction; Further, the guide portion comprises any structure or any combination of structures selected from the group consisting of a guide rod, a guide groove and a sliding rail; Further, the fixing member comprises a pipe clamp; Further, the limiting structure comprises a locking bolt.

[0009] Further, the rotating frame comprises a rotating plate and a support plate fixed to the top wall on both sides of the rotating plate, the top of the support plate is provided with a support arc groove for supporting the outer wall of the pipe, and the support arc groove is arranged in a flush manner with the inner wall of the pipe clamp.

[0010] Further, the first driving member comprises a pair of rotating wheels, a belt and a first driving motor, the pair of rotating wheels are respectively fixedly connected to the side frames in the vertical direction through shaft rods, the belt is arranged around the pair of rotating wheels, and the first driving motor is arranged on the base frame and connected to one of the rotating wheels.

[0011] Further, the second driving member comprises a second driving cylinder, the second driving cylinder is fixedly connected to the side frame in the vertical direction, the piston rod of the second driving cylinder is connected to the rotating frame and drives the rotating frame to rotate, the top of the base frame is provided with an arc-shaped guide groove, and the cylinder body of the second driving cylinder is slidingly connected in the guide groove.

[0012] Further, the rotating frame is fixedly provided with a fixing rod, a sliding sleeve is slidingly arranged on the fixing rod, and the piston rod of the second driving cylinder is hingedly connected to the sliding sleeve.

[0013] Further, four corners of the base frame are provided with adjusting assemblies for adjusting height. And / or, the base frame is provided with lifting lugs.

[0014] Further, the adjusting assemblies each include a sleeve, a sliding rod and an adjusting screw rod, the sleeve is fixedly arranged on the base frame, the sliding rod is slidingly inserted into the sleeve, and the adjusting screw rod is arranged along the length direction of the sleeve and is threadedly connected to the sliding rod.

[0015] In the second aspect, the present application is realized by the following technical solutions. The drainage PE pipeline hot melting connection method adopts the drainage PE pipeline hot melting connection device in the above scheme, and includes the following steps. S1, hoist the drainage PE pipeline hot melting connection device into the trench, and move to a position directly below the pipeline after cutting off a long pipe section; S2, clamp and fix the to-be-connected pipelines on the corresponding sides by the fixing members on the two sides respectively, and make the pipeline ends retain the protruding sections available for hot melting, then drive the pipelines on the two sides to rotate in opposite directions by the first driving member, so that the pipeline ends obtain the installation spacing; S3, hot melt and weld a first joint at one end of the replaced new pipe section, and weld the first joint to the end of the original pipeline on the corresponding side; then weld a second joint at the end of the original pipeline on the other side; S4, drive the first driving member to make the pipelines on the two sides return to the original positions, and drive the pipelines to bend upwards by the second driving member through the rotating frame, so that the other end of the replaced new pipe section is located in the same vertical plane as the second joint; S5, after completing the hot melting of the second joint and the new pipe section, continue to drive the pipelines to bend downwards by the second driving member, so that the new pipe section and the original pipeline are automatically aligned and finally inserted and installed.

[0016] The technical scheme of the present application has at least the following advantages and beneficial effects: 1. The application effectively expands the operation space between the pipe ends in the limited trench space by setting a pair of side frames that can rotate vertically on both sides of the base frame, and synchronously driving the two side frames to rotate in opposite directions by the first driving member, so that the ends of the two side pipes to be butt-jointed are respectively deflected to the sides of the trench in the vertical direction. Compared with the prior art that releases the butt-joint allowance by tilting the whole pipe upward, the application avoids the problems of requiring a large upward tilting angle and a large vertical space due to the installation of the new pipe section, the first joint and the second joint, significantly reduces the bending stress applied to the pipe, and reduces the risk of bending deformation or structural damage of the pipe end. At the same time, by rotating to both sides, a smaller rotation angle can obtain a larger installation and welding space, thereby facilitating the sequential installation and hot melt welding of the first joint, the second joint and the new pipe section, and improving the operability and safety of the on-site construction.

[0017] 2. After the hot melt installation of the first joint, the second joint and the new pipe section is completed, and the corresponding end of the second joint and the new pipe section is preheated in advance, the two pipes are rotated back to the original position by driving the first driving member, and at the same time, the pipe is bent upward by driving the rotating frame with the second driving member, so that the other end of the replaced new pipe section is located in the same vertical plane as the second joint, thereby realizing smooth alignment. Then, the pipe is bent downward by the second driving member, so that the new pipe section and the original pipe axis are accurately aligned and the final welding is completed. Through the above stage-by-stage and controlled rotation and bending process, the pipe butt-joint is changed from "forced alignment" to "posture adjustment and direct alignment", which not only improves the butt-joint precision and welding quality, but also effectively reduces the construction difficulty, and is especially suitable for the rapid and safe repair operation of large-diameter drainage PE pipes in limited space. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The application provides a whole structure schematic diagram of a drainage PE pipe hot melt connection device; Figure 2 The application aims to show the structure schematic diagram of the first driving member; Figure 3 The application aims to show the state schematic diagram of the two side frames rotating in opposite directions and installing the new pipe section; Figure 4 The application aims to show the state schematic diagram of the two side frames rotating back to the original position and the rotating frame gradually tilting upward to realize the pipe butt-joint; Figure 5 The application aims to show the state schematic diagram of the rotating frame tilting upward; Figure 6 The application aims to show the state schematic diagram of the new pipe section, the first joint and the second joint after installation; 100-base frame, 110-guide slot, 120-hanging lug, 200-side frame, 300-rotating frame, 310-guide part, 311-limiting structure, 3111-locking bolt, 312-guide rod, 320-rotating plate, 330-supporting plate, 331-supporting arc slot, 340-fixing rod, 350-sliding sleeve, 400-fixing piece, 410-tube clamp, 500-first driving piece, 510-rotating wheel, 520-wheel belt, 521-shaft rod, 530-first driving motor, 600-second driving piece, 610-second driving cylinder, 700-adjusting assembly, 710-sleeve, 720-sliding rod, 730-adjusting screw, 800-new pipe section, 810-first joint, 820-second joint, 900-groove. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0021] The following refers to Figures 1-6 As shown in the drawings, further illustrated in conjunction with specific embodiments, the present embodiment provides a drainage PE pipe hot melt connecting device, which comprises a base frame 100. The base frame 100 is provided in the form of a rectangular plate structure, which is used to provide a stable installation foundation and force support for the entire connecting device. Of course, in other embodiments, the base frame 100 can also be provided in the form of a frame structure, for example, a frame-shaped structure formed by welding a plurality of steel profiles or pipes, which effectively reduces the self-weight of the device under the premise of ensuring the overall strength and rigidity, facilitates hoisting and arrangement in the groove 900, and is especially suitable for municipal drainage projects with limited construction conditions.

[0022] The side frame 200 is a pair, and both sides of the side frame 200 are provided in a frame structure and are respectively mounted on both sides of the base frame 100 in a vertical direction, so that the side frame 200 can rotate relative to the base frame 100, thereby driving the clamped pipeline to change the posture. The rotating frame 300 is provided on the side frame 200 in a horizontal hinge manner, so that the rotating frame 300 can swing up and down relative to the side frame 200 around a horizontal axis, thereby providing a structural basis for subsequent pipeline bending and bending actions.

[0023] The fixing member 400 is mounted on both sides of the rotating frame 300, and both sides of the fixing member 400 are respectively used to clamp and fix the corresponding side of the to-be-connected pipeline, so as to realize reliable positioning and synchronous stress control of the two original pipelines. The fixing member 400 is provided with at least one pair along the guide direction of the guide portion 310, so that the fixing member 400 can be adjusted in position according to different construction spacings, thereby better adapting to the drainage PE pipeline.

[0024] In the embodiment, the fixing member 400 includes a pipe clamp 410 structure, which can form a ring clamping on the outer wall of the pipeline, and the stress is uniform, and the local damage to the outer wall of the pipeline is not easy. Of course, in other embodiments, the fixing member 400 can also be selected from a semicircular clamping block, an adjustable hoop or a clamping structure with a gasket, as long as it can realize stable fixation of the pipeline.

[0025] Referring to Figure 1 , Figure 5 As shown, the rotating frame 300 includes a guide portion 310, and the fixing member 400 is slidably mounted on the guide portion 310, so that the fixing member 400 can be adjusted in position along the guide portion 310. The guide portion 310 is provided with a limiting structure 311, which is used to lock the fixing member 400 after it is slid to a predetermined position along the guide portion 310, so as to prevent displacement during pipeline rotation or bending. In the embodiment, the limiting structure 311 is a locking bolt 3111, which realizes reliable locking of the position of the fixing member 400 by abutting or pressing the guide portion 310, which is simple in structure and convenient to operate, and is suitable for rapid adjustment on site.

[0026] The rotating frame 300 includes a rotating plate 320 and a support plate 330 welded or bolted on both sides of the top wall of the rotating plate 320, and the support plate 330 is used for auxiliary supporting and stress sharing of the pipeline. The top of the support plate 330 is provided with a support arc groove 331 for supporting the outer wall of the pipeline, and the curvature of the support arc groove 331 matches the outer wall of the pipeline, so that the pipeline can be supported in surface contact, avoiding local pressure injury caused by point contact. The inner wall of the support arc groove 331 is flush with the inner wall of the pipe clamp 410, so that the pipeline is more uniformly stressed as a whole after being clamped, thereby improving the stability of the pipeline during bending and rotation.

[0027] As an optional embodiment, the guide part 310 can include any structure of guide rod 312, guide groove, sliding rail or any combination thereof to adapt to different manufacturing processes and use requirements. In the embodiment, the guide rod 312 is arranged as a pair and fixed transversely on the support plates 330 on both sides to form a double guide rod 312 guide structure, so that the fixed part 400 is not easy to be deflected during sliding and can provide stable and reliable guide support.

[0028] The pipe clamp 410 is installed on the guide rod 312 in a sliding manner, the locking bolt 3111 is arranged through the pipe clamp 410 and abuts against the guide rod 312, and the relative movement of the pipe clamp 410 on the guide rod 312 is limited by tightening the locking bolt 3111, so that the position of the pipe clamp 410 can be quickly fixed and released, and the construction personnel can flexibly adjust according to the actual butt joint requirements.

[0029] Referring to Figure 2 The first driving part 500 is installed on the base frame 100 and is used to synchronously drive a pair of side frames 200 to rotate in opposite directions, so that the pipe ends clamped on both sides can be deflected in opposite directions along the vertical direction. The first driving part 500 includes a pair of rotating wheels 510, a belt 520 and a first driving motor 530, wherein the pair of rotating wheels 510 are respectively fixedly connected to the two side frames 200 along the vertical direction through shaft rods 521, the shaft rods 521 are fixedly connected to the side frames 200 along the vertical direction, the belt 520 is arranged outside the pair of rotating wheels 510, and the first driving motor 530 is fixedly arranged on the base frame 100 and is in transmission connection with one of the rotating wheels 510, so as to realize synchronous and reverse rotation of the two side frames 200. In the embodiment, the rotating wheels 510 and the belt 520 adopt a chain wheel and chain structure, which has the advantages of reliable transmission and strong anti-pollution capability.

[0030] Of course, in other embodiments, the first driving part 500 can also adopt a synchronous belt mechanism, a gear transmission mechanism, or respectively arrange motors on the two side frames 200 for synchronous control, as long as the reverse linkage of the two side frames 200 can be realized.

[0031] Referring to Figure 1 , Figure 5 and Figure 6As shown, the second driving member 600 is mounted on the side frame 200 and used to drive the rotating frame 300 to swing up and down around the hinge shaft and achieve position locking after swinging to the target position. Specifically, the second driving member 600 includes a second driving cylinder 610 which is fixedly connected on the side frame 200 along the vertical direction, and the piston rod thereof is connected with the rotating frame 300, so as to drive the rotating frame 300 to swing up or down around the hinge shaft under the extension and contraction of the cylinder. The top of the base frame 100 is provided with an arc-shaped guide groove 110, and the cylinder body of the second driving cylinder 610 is connected in the guide groove 110 in a sliding manner, so that the second driving cylinder 610 can be adjusted in position along the predetermined track during the driving process, avoiding interference due to rotation limitation. The guide groove 110 can be in the form of a guide rail as shown, or in the form of an arc-shaped clamping groove structure formed on the top of the base frame 100. Figure 1

[0032] As shown, the guide groove 110 is formed in an arc shape with the shaft rod 521 part as the center, one end of which is located in the vertical plane of the shaft rod 521 of the two side frames 200, and the other end extends in the direction away from the vertical plane to form an arc segment, so as to effectively limit the movement track of the second driving cylinder 610, and make the rotating frame 300 more smooth and controllable during the upswing and downswing.

[0033] It needs to be emphasized that the connecting device is especially suitable for the construction environment where the depth of the trench 900 is relatively shallow, the vertical operation space is limited, and the upswing space of the rotating frame 300 is insufficient, such as the emergency repair or partial excavation construction scene of the drainage pipeline under the municipal road. In actual use, the connecting device can be pushed to the position of the pipeline to be repaired from the side edge of the trench 900 formed by excavation, without the need to reserve a larger operation space above the pipeline or to carry out secondary excavation.

[0034] By driving the two side frames 200 by the first driving member 500 first, the ends of the two side pipelines to be connected are respectively rotated vertically and reversely to the two sides of the trench 900, so as to form sufficient transverse installation space between the pipelines, and then the installation and hot melt welding of the first joint 810, the second joint 820 and the new pipe segment 800 are completed in sequence, so that the whole connecting process can be smoothly completed in the limited vertical space. This operation mode effectively avoids the problems in the traditional construction that the welding head cannot enter due to insufficient space above, and the operation posture is limited.

[0035] ​Of course, it also needs to be further explained that if the to-be-connected pipe is directly rotated upward as a whole in a traditional way, the pipe interface will be in an upward inclined state, in which case the operator must manually adjust the posture of the welding head when using the welding head to perform hot melt welding in order to try to ensure coaxiality, which is not only difficult to operate, but also prone to fatigue due to the heavy weight of the welding head held for a long time. It is extremely easy to cause axial deviation or uneven welds by relying solely on the naked eye to correct the interface, thereby affecting the welding quality and later use safety.

[0036] The to-be-connected pipe is rotated towards both sides of the groove 900, so that the pipe interface can be directly in a substantially horizontal state during welding, and the welding head is more likely to maintain a stable posture and align naturally with the pipe axis under the action of gravity, thereby achieving more stable and accurate coaxial welding. This way not only reduces the operating strength of the operator, but also significantly improves the welding consistency and connection reliability, effectively reducing welding defects and rework risks.

[0037] As an optional embodiment, the part of the two side frames 200 rotating on the base frame 100 is located at the edge position where the two side frames 200 are away from each other, and the part of the two rotating frames 300 rotating on the side frames 200 is also located at the edge position where the two side frames 200 are away from each other. Through the above structural arrangement, a larger pipe offset can be obtained under the same rotation angle, thereby further improving the bending adjustment range of the pipe and providing more ample operating space for installing the new pipe section 800 and the first joint 810 and the second joint 820.

[0038] In order to realize the up-down rotation of the rotating frame 300, a fixed rod 340 is welded at the middle position of the end of the rotating frame 300 away from the hinge, and a sliding sleeve 350 is slidably sleeved on the fixed rod 340. The piston rod of the second driving cylinder 610 is hingedly connected with the sliding sleeve 350. During the up-down rotation of the rotating frame 300 driven by the second driving cylinder 610, the sliding sleeve 350 can slide along the direction of the fixed rod 340, thereby compensating for the relative displacement during movement, avoiding mechanism jamming, and improving the smoothness and reliability of the overall movement.

[0039] Referring to Figure 5As shown, the four corners of the base frame 100 are each provided with an adjusting assembly 700 for adjusting the height to adapt to the complex construction conditions such as unevenness, local collapse or slope change at the bottom of the trench 900. Each adjusting assembly 700 includes a sleeve 710, a sliding rod 720 and an adjusting screw 730, the sleeve 710 is fixedly welded on the base frame 100, the sliding rod 720 is inserted into the sleeve 710 in a vertically slidable manner, and the adjusting screw 730 is arranged along the length direction of the sleeve 710 and is threadedly connected to the sliding rod 720. By rotating the adjusting screw 730, the sliding rod 720 can be driven to vertically extend or retract, so as to accurately adjust the height and overall levelness of the base frame 100, to ensure that the pipeline is always in a stable and controllable posture during clamping, rotating and hot-melt butt joint, and to avoid the adverse effect of the inclination of the base frame 100 on the welding coaxiality.

[0040] Of course, in other optional embodiments, the adjusting assembly 700 can also adopt an automatic adjusting structure, for example, the adjusting screw 730 is replaced by a vertically arranged adjusting cylinder or hydraulic cylinder, and the height of the base frame 100 is quickly and automatically adjusted by pneumatic or hydraulic driving, which is particularly suitable for working conditions requiring frequent adjustment of the device height or high construction efficiency. At the same time, the base frame 100 can also be provided with a roller or universal wheel structure, which can facilitate short-distance movement and accurate positioning of the entire device in or at the edge of the trench 900 when it is not fixed; after the device is positioned, the locking mechanism of the roller is locked to ensure the overall stability during construction.

[0041] Further, to improve the anti-overturning ability and overall stability of the device during operation, the base frame 100 can also be provided with a plug rod structure, which can be inserted into the soil or cushion layer at the bottom of the trench 900 to limit the vertical and horizontal displacement of the base frame 100; or in other embodiments, a jacking rod can be provided on the base frame 100, which can be extended and abut against the side wall of the trench 900, so as to limit the displacement and shaking of the base frame 100 during stress by lateral support. The above-mentioned various stabilizing methods can be used alone or in combination according to the construction environment to adapt to different geological conditions and forms of the trench 900.

[0042] As an optional embodiment, the base frame 100 can also be provided with a lifting lug 120 structure, which is used to connect with hoisting equipment to hoist the entire connecting device into or out of the trench 900. In specific implementation, the lifting lug 120 can be provided as a pair, three pairs or multiple pairs and arranged in the length direction or width direction of the base frame 100 to adapt to different hoisting methods and stress requirements. By installing multiple lifting lugs 120, the stress on the device during hoisting can be more uniform, reducing the risk of tilting or swinging, thereby further improving the construction safety, hoisting stability and overall operation efficiency.

[0043] In addition, the application further provides a hot melt connecting method of a drainage PE pipeline, which comprises the following steps by using the hot melt connecting device of the drainage PE pipeline in the above embodiment: S1, hoisting the hot melt connecting device of the drainage PE pipeline into the trench 900 and moving to a position directly below the pipeline after cutting a long pipeline section; S2, clamping and fixing the two side fixing members 400 to the corresponding side pipelines to be connected and reserving the protruding sections at the pipeline ends for hot melt, and then rotating the two pipelines in opposite directions by the first driving member 500 to obtain the installation spacing of the pipeline ends; S3, hot melt welding the first joint 810 at one end of the replaced new pipeline section 800 and welding the first joint 810 to the end of the corresponding side original pipeline, and then welding the second joint 820 at the end of the other side original pipeline; S4, rotating the two pipelines back to the original position by the first driving member 500, and bending the pipelines upward by the second driving member 600 to drive the rotating frame 300 to make the other end of the replaced new pipeline section 800 and the second joint 820 located in the same vertical plane; S5, after completing the hot melt of the second joint 820 and the new pipeline section 800, continuing to bend the pipelines downward by the second driving member 600 to automatically align the axis of the new pipeline section 800 and the original pipeline and finally realize the plug-in installation.

[0044] The above is only the preferred embodiment of the application and is not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A hot melt jointing device for drainage PE pipes, characterized in that, The utility model relates to a kind of pipe butt joint device, including: Base frame (100); Side frame (200), the side frame (200) is a pair of, respectively along vertically rotatably arranged in the two sides of base frame (100); Rotary frame (300), the rotary frame (300) is horizontally hinged on side frame (200); Fixing part (400), it is arranged in the rotary frame (300) on two sides, and the fixing part (400) on two sides is used to clamp and fix the pipe to be butt-jointed on corresponding side respectively; First driving part (500), it is arranged in base frame (100), and it is used to synchronously drive a pair of side frame (200) to rotate in opposite directions; Second driving part (600), it is arranged in side frame (200), and it is used to drive rotary frame (300) to swing up and down around its hinge shaft and realize position locking after swinging.

2. The hot melt coupling device for a drainage PE pipe according to claim 1, characterized in that, The rotary frame (300) includes guide portion (310), the fixing part (400) is slidably installed on the guide portion (310), the guide portion (310) has limiting structure (311), and the limiting structure (311) is used to fix the position of fixing part (400) after sliding along the guide portion (310); And / or, the part of the side frame (200) on two sides rotates in base frame (100) is located in the edge position of the side frame (200) on two sides away from each other, and the part of the rotary frame (300) on two sides rotates in the side frame (200) on two sides is also located in the edge position of the side frame (200) on two sides away from each other.

3. A hot melt jointing device for drainage PE pipes according to claim 2, characterized in that, The fixing part (400) is at least provided with a pair along the guide direction of guide portion (310); And / or, the guide portion (310) includes any structure or any combination of guide rod (312), guide slot, sliding rail; And / or, the fixing part (400) includes pipe clamp (410); And / or, the limiting structure (311) includes locking bolt (3111).

4. The hot melt coupling device for a drainage PE pipe according to claim 3, characterized in that The rotary frame (300) includes rotary plate (320) and support plate (330) fixed to the top wall of rotary plate (320), the top of support plate (330) is provided with support arc slot (331) supporting pipe outer wall, and the inner wall of support arc slot (331) is flush with pipe clamp (410).

5. The hot melt coupling device for a drainage PE pipe according to claim 1, characterized in that, The first driving part (500) includes a pair of rotary wheels (510), wheel belt (520) and first driving motor (530), a pair of rotary wheels (510) are respectively fixedly connected on side frame (200) by shaft (521) along vertical direction, wheel belt (520) is arranged around a pair of rotary wheels (510), and first driving motor (530) is arranged on base frame (100) and connected with one of rotary wheels (510).

6. The hot melt coupling device for a drainage PE pipe according to claim 1, characterized in that The second driving member (600) comprises a second driving cylinder (610) fixedly connected on the side frame (200) in the vertical direction, a piston rod of the second driving cylinder (610) is connected with the rotating frame (300) and drives the rotating frame (300) to rotate, and the top of the base frame (100) is provided with an arc-shaped guide groove (110), and a cylinder body of the second driving cylinder (610) is slidingly connected in the guide groove (110).

7. A hot melt coupling device for a drainage PE pipe according to claim 6, characterized in that The rotating frame (300) is fixedly provided with a fixed rod (340), a sliding sleeve (350) is slidingly sleeved on the fixed rod (340), and a piston rod of the second driving cylinder (610) is hingedly connected with the sliding sleeve (350).

8. The hot melt coupling device for a drainage PE pipe according to claim 1, characterized in that The base frame (100) is provided with an adjusting assembly (700) for adjusting height at four corners of the base frame (100). And / or, the base frame (100) is provided with an ear (120).

9. A hot melt coupling device for a drainage PE pipe according to claim 8, characterized in that The adjusting assembly (700) comprises a sleeve (710), a sliding rod (720) and an adjusting screw rod (730), the sleeve (710) is fixedly arranged on the base frame (100), the sliding rod (720) is slidingly inserted in the sleeve (710), and the adjusting screw rod (730) is arranged in the length direction of the sleeve (710) and is threadedly connected on the sliding rod (720).

10. A method for hot melt joining of a drainage PE pipe using the hot melt joining device for a drainage PE pipe according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: S1, hoist the drainage PE pipeline hot melt connecting device into the groove (900) and move to a position directly below the pipeline after cutting a long pipeline section; S2, clamp and fix the two side fixed members (400) on the corresponding side pipeline to be connected, and make the pipeline end part reserved for hot melting, then drive the two side pipelines to rotate in opposite directions by the first driving member (500) to obtain the installation spacing of the pipeline ends; S3, hot melt weld a first joint (810) at one end of the replaced new pipeline section (800), and weld the first joint (810) on the end of the corresponding side original pipeline; then weld a second joint (820) on the end of the other side original pipeline; S4, drive the first driving member (500) to rotate the two side pipelines to reset, and drive the rotating frame (300) to bend the pipeline upward by the second driving member (600) to make the other end of the replaced new pipeline section (800) and the second joint (820) located in the same vertical plane; S5, after completing the hot melting of the second joint (820) and the new pipeline section (800), continue to drive the pipeline to bend downward by the second driving member (600) to make the new pipeline section (800) and the original pipeline axis automatically aligned and finally realize the insertion and installation.

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