PPR pipe hot melt connecting device

Abstract

The application provides a PPR pipeline hot melt connecting device and relates to the technical field of pipeline installation. The device comprises a frame body, two sets of clamping mechanisms, a first mounting mechanism and a second mounting mechanism. The frame body is provided with abutting members on both sides for abutting against the side walls of a pipeline trench. The two sets of clamping mechanisms are arranged at the bottom ends of the frame body, the first mounting mechanism is arranged on one side of the frame body and used for mounting a tee pipe or a cross pipe to one of the truncated surfaces of a buried pipeline, and the second mounting mechanism is arranged on the other side of the frame body and comprises two support seats and two elbow mounting members arranged between the two support seats. One of the elbow mounting members is used for mounting an elbow to the tee pipe or the cross pipe, and the other elbow mounting member is used for mounting an elbow to the other truncated surface of the buried pipeline. The device can place a pipe fitting into a pipeline trench and align the pipe fitting outside the pipeline trench, does not need to open a pipeline trench with a large width, and can facilitate the operation of workers.

Description

Technical Field

[0001] This invention relates to the field of pipeline installation technology, and more specifically, to a PPR pipeline heat fusion connection device. Background Technology

[0002] PPR pipes have high chemical stability and can resist the corrosion of most chemicals such as acids, alkalis, and salts. They will not rust or breed bacteria, making them suitable for long-term burial in damp soil. Therefore, they can be used as buried water pipes. With proper construction and suitable environment, they have good durability and a design service life of up to several decades.

[0003] Reference Figure 8 As shown, when the buried pipeline 5 leaks or needs to be added as a branch pipe, the buried pipeline 5 needs to be cut off at a designated location. Then, the corresponding pipe fittings are heat-fused between the two cut ends. When repairing the leaking buried pipeline 5, an elbow 7 is connected between the two cut ends, and then a bridge pipe is connected between the two elbows 7. When a new branch pipe is needed, a tee or cross pipe 6 is connected to one of the cut sections of the buried pipeline 5. One elbow 7 is installed on the tee or cross pipe 6, and the other elbow 7 is installed on the other cut section of the buried pipeline 5. Finally, the two elbows 7 are connected by a bridge pipe 8.

[0004] The bridge pipe is installed close to the ground, making heat fusion connection relatively convenient. However, the tee pipe, cross pipe 6, and elbow 7 need to be heat-fused within the excavated trench. Currently, wider trenches are typically excavated to provide sufficient space for workers to enter. However, both trench excavation and backfilling processes are time-consuming, and workers face difficulties operating within the trench, which can negatively impact construction quality. Summary of the Invention

[0005] The purpose of this invention is to provide a PPR pipe heat fusion connection device, which can insert pipe fittings into the pipe trench and align them outside the trench without the need to open a wide pipe trench, and can facilitate operation by workers.

[0006] This invention is achieved through the following technical solution: a PPR pipe heat fusion connection device, comprising:

[0007] The frame body has clamping parts on both sides for abutting against the side wall of the pipe trench;

[0008] Two sets of clamping mechanisms are set at both ends of the bottom of the frame to clamp the cut-off buried pipes;

[0009] The first installation mechanism, located on one side of the frame, is used to install a tee or cross pipe to one of the cross sections of the buried pipeline.

[0010] The second installation mechanism is located on the other side of the frame. The second installation mechanism includes two support seats and two elbow installation components are arranged between the two support seats. One of the elbow installation components is used to install the elbow onto a tee or cross pipe, and the other elbow installation component is used to install the elbow onto another section of the buried pipeline.

[0011] The elbow mounting component includes a mounting base, on which a vertical frame and a lifting component for driving the vertical frame to rise and fall are provided along the vertical direction. A horizontal seat is provided on both sides of the bottom of the vertical frame. An elbow support is slidably provided on the bottom of each of the two horizontal seats along its own length direction. A clamping cavity adapted to the shape of the elbow is opened on the side of each of the two elbow supports that is close to each other.

[0012] The transverse seat is provided with a limiting member for limiting the position of the elbow support so that the two elbow supports can abut against the two sides of the elbow. The bottom of the lifting member is provided with a loosening member for separating the limiting member from the transverse seat.

[0013] Furthermore, a sliding rod is provided at the top of the elbow support, and a groove is provided on the bottom surface of the transverse seat for the sliding rod to slide. A return spring is connected between the sliding rod and the end wall of the groove. The limiting member is a limiting block, which is slidably mounted on the sliding rod in the vertical direction. A through groove is provided on the transverse seat for the limiting block to move out. When the two elbow supports move toward each other to the end of the groove, the limiting block can extend out of the through groove to limit the position of the sliding rod.

[0014] Furthermore, the lifting component includes a lifting electric cylinder, the cylinder of which is fixedly mounted on a horizontal seat, and an ear plate is provided on the vertical frame. The piston rod of the lifting electric cylinder passes through the ear plate and has a drive plate at its end. The drive plate is located below the ear plate and can support the ear plate.

[0015] Furthermore, the detaching component is a detaching rod, which is fixedly installed at the bottom of the drive plate and located directly above the limiting component; when the elbow is heat-fused and connected, and the lifting electric cylinder drives the drive plate to move downward, the detaching rod can drive the limiting component to release the limitation on the position of the elbow support.

[0016] Furthermore, a lateral movement assembly is provided between the two support seats to drive the two elbow mounting components to move closer to or further away from each other. The lateral movement assembly includes a drive motor, a dual-axis lead screw, and a guide rod. The dual-axis lead screw is rotatably connected between the two support seats, and the guide rod is fixedly connected between the two support seats. The drive motor is fixedly mounted on one of the support seats, and the output shaft of the drive motor is coaxially connected to the dual-axis lead screw. The two elbow mounting components are located at the two ends of the dual-axis lead screw, and the elbow mounting components are provided with threaded holes adapted to the dual-axis lead screw and through holes adapted to the guide rod.

[0017] Furthermore, the first installation mechanism includes an installation frame, which is slidably disposed within the frame along the length of the frame. The frame is provided with a transverse electric cylinder for driving the installation frame to move. An installation bracket is disposed within the installation frame, and the installation bracket has multiple legs. Each leg has an arc-shaped bottom rod at its bottom for defining the position of a T-shaped pipe or a four-way pipe. The arc-shaped bottom rod is rotatably disposed on the leg, and the leg is provided with an abutment for maintaining the position of the arc-shaped bottom rod.

[0018] Furthermore, the abutting member includes an abutting rod, which is slidably disposed on the support leg along the length direction of the support leg. An abutting block is provided at the bottom end of the abutting rod. When the bottom height of the abutting block is lower than the bottom height of the support leg, the abutting block can abut against the arc-shaped bottom rod and restrict the arc-shaped bottom rod from flipping.

[0019] Furthermore, the mounting bracket has a top plate, on which a flattening component for flattening a tee or cross pipe is slidably disposed. The flattening component includes a flattening plate and a flattening rod. The flattening rod is slidably disposed inside the top plate, and the flattening plate is fixedly disposed at the bottom end of the flattening rod. Each of the four corners of the flattening plate is provided with a slider. The support leg is provided with a sliding groove for the slider to slide. The bottom surface of the flattening plate is provided with a groove that matches the shape of the tee or cross pipe.

[0020] Furthermore, the top plate is also provided with a clamping component for clamping the flattening rod. The clamping component includes a rotating bracket rotatably mounted on the top plate. The rotating bracket is internally threaded with a clamping screw, and a clamping block is provided on the clamping screw.

[0021] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0022] 1. This invention installs a tee or cross pipe by setting a first installation mechanism. During installation, the tee or cross pipe is placed in the installation frame outside the pipe trench. Under the action of gravity, the tee or cross pipe moves downward to the arc-shaped bottom rod. Then, the tee or cross pipe is pressed by the flattening and clamping parts to make the tee or cross pipe in a horizontal state to ensure the installation quality. The state of the arc-shaped bottom rod is adjusted by the abutment part so that the arc-shaped bottom rod can be flipped after the tee or cross pipe is installed so that it can be removed from the pipe trench.

[0023] 2. The present invention installs the elbow through a second installation mechanism. During installation, the elbow is installed between two elbow supports outside the pipe trench, and the elbow is sent downward into the pipe trench by a lifting component. After the elbow is heat-fused with a tee, cross, or buried pipeline, the loosening component at the bottom of the lifting component can separate the limiting component from the transverse seat, thereby releasing the limiting effect between the elbow support and the transverse seat, so that the elbow support can be removed from the pipe trench after the elbow is installed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the usage state of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the first mounting mechanism of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the second mounting mechanism of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of a single elbow mounting component of the present invention;

[0029] Figure 6 for Figure 5 Enlarged view of part A;

[0030] Figure 7 This is a schematic diagram of the structure of the limiting member and the elbow support of the present invention on the transverse seat;

[0031] Figure 8 A schematic diagram showing the installation of four-way pipes, elbows, and crossover pipes into a buried pipeline.

[0032] Reference numerals: 1-Frame, 11-Clamping component, 2-Clamping mechanism, 3-First mounting mechanism, 31-Mounting frame, 32-Horizontal electric cylinder, 33-Mounting bracket, 331-Outrigger, 332-Arc-shaped base rod, 333-Top plate, 34-Clamping component, 341-Clamping rod, 342-Clamping block, 35-Flattening component, 351-Flattening plate, 3511-Slider, 352-Flattening rod, 36-Clamping component, 361-Rotating bracket, 362-Clamping screw, 363-Clamping block, 4-Second mounting mechanism, 41-Support 42-Edge mounting component, 421-Mounting base, 422-Vertical frame, 4221-Ear plate, 423-Lifting component, 4231-Lifting electric cylinder, 4232-Drive plate, 424-Horizontal seat, 425-Edge support, 4251-Sliding rod, 4252-Reset spring, 426-Limiting component, 427-Loosening component, 43-Horizontal movement assembly, 431-Drive motor, 432-Dual-axis lead screw, 433-Guide rod, 5-Buried pipe, 51-Cut-off section, 6-Four-way pipe, 7-Edge, 8-Bridge pipe. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] The following is for reference Figures 1-8 As shown in the illustration, and further explained with reference to specific embodiments, this embodiment provides a PPR pipe heat fusion connection device, referring to... Figure 1 , Figure 2 As shown, the system includes a frame 1, two sets of clamping mechanisms 2, a first installation mechanism 3, and a second installation mechanism 4. Both sides of the frame 1 are equipped with clamping members 11 for abutting against the sidewalls of the trench. After the frame 1 is placed in the excavated trench, the clamping members 11 can stably fix the frame 1 to the top of the trench. The two sets of clamping mechanisms 2 are located at the bottom ends of the frame 1. After the trench is excavated and the buried pipeline 5 is cut at a designated location, the two sets of clamping mechanisms 2 clamp the two ends of the cut buried pipeline 5 respectively. Then, a tee or cross pipe 6 can be easily installed at one end of the buried pipeline 5, and an elbow 7 can be installed on the tee or cross pipe 6. Another elbow 7 can be installed at the other end of the buried pipeline 5. Finally, the two elbows 7 are connected by a bridge pipe 8 (see reference). Figure 8This refers to the completion of the pipeline modification process for the buried pipeline 5. The first installation mechanism 3 is located on one side of the frame 1 and is used to install the tee or cross pipe 6 to one of the cross sections of the buried pipeline 5. The second installation mechanism 4 is located on the other side of the frame 1. The second installation mechanism 4 includes two support seats 41 and two elbow installation parts 42 are arranged between the two support seats 41. One elbow installation part 42 is used to install the elbow 7 onto the tee or cross pipe 6, and the other elbow installation part 42 is used to install the elbow 7 onto another cross section of the buried pipeline 5.

[0035] In this embodiment, branch pipes need to be added on both sides of the buried pipeline 5. Therefore, a four-way pipe 6 is installed on one of the cross sections of the buried pipeline 5, and then a bend 7 is installed on the end of the four-way pipe 6 away from the cross section. The other bend 7 is installed on the other cross section of the buried pipeline 5. In other embodiments, if only one branch pipe needs to be added, a tee pipe is used instead of the four-way pipe 6 for installation.

[0036] In this embodiment, the clamping component 11 includes a support block and a clamping screw. The support block is welded to the frame 1, and the clamping screw is threaded onto the support block. By tightening the clamping screw and having its end abut against the side wall of the trench, the stability of the frame 1 is improved. Each clamping mechanism 2 includes two clamping rods and a drive assembly for driving the two clamping rods closer to or further apart. The bottom of the clamping rods is provided with an arc-shaped portion to facilitate contact with the outer wall of the buried pipeline. The drive assembly can be a motor screw assembly or a cylinder, capable of driving the clamping rods to move synchronously in the direction of approaching or moving away from each other.

[0037] Reference Figure 2 , Figure 3As shown, the first mounting mechanism 3 includes a mounting frame 31, which is slidably disposed within the frame 1 along its length. A transverse electric cylinder 32 is mounted on the frame 1 to drive the mounting frame 31 to move. A mounting bracket 33 is disposed within the mounting frame 31. The mounting bracket 33 has multiple legs 331, and each leg 331 has an arc-shaped base rod 332 at its bottom for defining the position of a T-shaped or four-way pipe 6. The arc-shaped base rod 332 is rotatably mounted on the leg 331, and an abutment member 34 is disposed on the leg 331 to maintain the position of the arc-shaped base rod 332. The top of the mounting bracket 33 extends to the lower part of the mounting frame 31 to provide space for the four-way pipe 6 to be inserted. The position of the arc-shaped bottom rod 332 is defined by the abutment member 34, so that the arc-shaped bottom rod 332 can support the four-way pipe 6 at the bottom. The four-way pipe 6 is inserted from the space at the top of the mounting bracket 33. Under its own weight, the four-way pipe 6 slides down along the support leg 331 to the position of the arc-shaped bottom rod 332. At this time, the end of the four-way pipe 6 is aligned with the cross-section of the buried pipe 5, which can facilitate the heat fusion operation. After the heat fusion is completed, the four-way pipe 6 is driven by the horizontal electric cylinder 32 to press against the cross-section of the buried pipe 5 for connection.

[0038] Reference Figure 3 As shown, the abutment member 34 includes an abutment rod 341, which is slidably disposed on the support leg 331 along the length direction of the support leg 331. An abutment block 342 is provided at the bottom end of the abutment rod 341. When the bottom height of the abutment block 342 is lower than the bottom height of the support leg 331, the abutment block 342 can abut against the arc-shaped bottom rod 332 and restrict the arc-shaped bottom rod 332 from flipping. Before placing the four-way pipe 6 into the mounting bracket 33, press down on the abutment rod 341 and make the abutment block 342 limit the position of the arc-shaped bottom rod 332. At this time, the arc-shaped bottom rod 332 will not flip relative to the support leg 331, and the four-way pipe 6 can be stably located between multiple arc-shaped bottom rods 332. After the four-way pipe 6 is heat-fused, pull up on the abutment rod 341 and make the abutment block 342 move upward to separate from the arc-shaped bottom rod 332. The arc-shaped bottom rod 332 can then flip over, so that when the entire frame 1 is moved out of the trench, the mounting bracket 33 can be separated from the four-way pipe 6.

[0039] Reference Figure 3As shown, the mounting bracket 33 has a top plate 333 on its top. A flattening component 35 for flattening the four-way pipe 6 is slidably disposed on the top plate 333. A clamping component 36 for clamping the flattening rod 352 is also provided on the top plate 333. Since the four-way pipe 6 may tilt during downward sliding, the flattening component 35 applies downward pressure to the four-way pipe 6 to keep the four-way pipe 6 in a horizontal state, thereby ensuring that the branch pipes to be installed on both sides of the four-way pipe 6 are in a horizontal state after welding. Further, the flattening component 35 includes a flat plate 351 and a flattening rod 352. The flattening rod 352 is slidably connected in the top plate 333, and the flat plate 351 is fixedly connected to the bottom end of the flattening rod 352. Slider blocks 3511 are provided at each of the four corners of the flat plate 351. The support leg 331 has a groove for sliding the slider 3511. The bottom surface of the flat plate 351 has a groove that matches the shape of the four-way pipe 6. The clamping component 36 includes a rotating bracket 361 rotatably mounted on the top plate 333. The rotating bracket 361 is internally threaded with a clamping screw 362, and a clamping block 363 is provided on the clamping screw 362. The pressing rod 352 is moved downward to make the pressing plate 351 contact the four-way pipe 6. Then, the rotating bracket 361 is rotated to a vertical position, and the clamping screw 362 is tightened to press against the pressing rod 352, which allows the pressing plate 351 to press against the four-way pipe 6, ultimately bringing the four-way pipe 6 into a horizontal position.

[0040] Reference Figure 4 , Figure 5 As shown, the elbow mounting component 42 includes a mounting base 421. A vertical frame 422 and a lifting component 423 for driving the vertical frame 422 to rise and fall are provided on the mounting base 421 along the vertical direction. A horizontal seat 424 is provided on both sides of the bottom of the vertical frame 422. An elbow support 425 is slidably provided on the bottom of each of the two horizontal seats 424 along its own length direction. The two elbow supports 425 have clamping cavities adapted to the shape of the elbow 7 on their sides that are close to each other. When the two elbow supports 425 move in the direction that are close to each other, they can clamp the elbow 7 and keep the elbow 7 in position, so that one end face of the elbow 7 is in a vertical orientation, so as to facilitate the subsequent connection of the bridge pipe 8 between the two elbows 7. The transverse seat 424 is provided with a limiting member 426 for limiting the position of the elbow support 425 so that the two elbow supports 425 can abut against the two sides of the elbow 7. The bottom of the lifting member 423 is provided with a loosening member 427 for separating the limiting member 426 from the transverse seat 424.

[0041] When the elbow 7 is placed in the gap between the two elbow supports 425, and then the two elbow supports 425 are moved closer to each other, the position of the elbow supports 425 is maintained by the limiting member 426. At this time, the elbow 7 is stably fixed between the two elbow supports 425. During the process of putting the elbow 7 into the pipe trench by the lifting member 423, the elbow 7 can always be kept in a clamped state. After the elbow 7 is welded to the four-way pipe 6 by the hot melt, when the vertical frame 422 is driven to move by the lifting member 423, the loosening member 427 at the bottom of the lifting member 423 can separate the limiting member 426 from the horizontal seat 424. At this time, the limiting member 426 no longer limits the elbow supports 425, and the two elbow supports 425 can move away from each other along the length direction of the horizontal seat 424 and separate from the elbow 7.

[0042] Reference Figure 5 , Figure 6 and Figure 7 As shown, a sliding rod 4251 is provided on the top of the elbow support 425, and a groove for sliding the sliding rod 4251 is provided on the bottom surface of the transverse seat 424. A return spring 4252 is connected between the sliding rod 4251 and the end wall of the groove. The limiting member 426 is a limiting block, which is slidably disposed on the sliding rod 4251 in the vertical direction. A through groove is provided on the transverse seat 424 for the limiting block to move out. When the two elbow supports 425 move towards each other to the end of the groove, the limiting block can extend out of the through groove to limit the position of the sliding rod 4251. The lifting component 423 drives the vertical frame 422 upward to a position close to the top opening of the trench to facilitate operation by the staff; the two elbow supports 425 are moved closer to each other and locked on both sides of the elbow 7, and then the position of the elbow supports 425 on the horizontal seat 424 is fixed by the limiting component 426 to limit the elbow 7; then the lifting component 423 drives the vertical frame 422 downward to the bottom of the trench to send the elbow 7 into the trench to facilitate docking with the four-way pipe 6 or the buried pipe 5.

[0043] Reference Figure 5 , Figure 6As shown, the lifting component 423 includes a lifting cylinder 4231. The cylinder of the lifting cylinder 4231 is fixedly mounted on the horizontal seat 424. An ear plate 4221 is provided on the vertical frame 422. The piston rod of the lifting cylinder 4231 passes through the ear plate 4221 and has a drive plate 4232 at its end. The drive plate 4232 is located below the ear plate 4221 and can support the ear plate 4221. The releasing component 427 is a releasing rod, which is fixedly mounted at the bottom of the drive plate 4232 and located directly above the limiting component 426. When the elbow 7 is heat-fused, when the lifting cylinder 4231 drives the drive plate 4232 to move downward, the releasing rod can drive the limiting component 426 to release the limitation on the position of the elbow support 425. After the elbow 7 is installed between the two elbow supports 425, during the downward movement of the vertical frame 422 driven by the lifting cylinder 4231, the ear plate 4221 and the drive plate 4232 remain in contact under the weight of the vertical frame 422, the elbow supports 425, and the elbow 7. Therefore, during the downward insertion of the elbow 7 into the pipe trench, the release rod remains above the limiting member 426 and does not contact it. The elbow 7 can be supported after being heat-fused to the end of the buried pipeline 5 or the four-way pipe 6. Therefore, when the drive plate 4232 is driven to move by the lifting electric cylinder 4231, the drive plate 4232 moves downward and separates from the ear plate 4221. The release rod at the bottom of the drive plate 4232 can push the limiting member 426 downward to release the restriction on the position between the elbow support 425 and the transverse seat 424. This allows the two elbow supports 425 to move away from each other and separate from the elbow 7. The lifting electric cylinder 4231 drives the vertical frame 422 to move upward, which can drive the elbow support 425 to move out of the trench.

[0044] Reference Figure 5As shown, a lateral moving assembly 43 is also provided between the two support bases 41 for driving the two elbow mounting parts 42 to move closer to or further away from each other. The lateral moving assembly 43 includes a drive motor 431, a dual-axis lead screw 432 and a guide rod 433. The dual-axis lead screw 432 is rotatably connected between the two support bases 41, and the guide rod 433 is fixedly connected between the two support bases 41. The drive motor 431 is fixedly mounted on one of the support bases 41 and the output shaft of the drive motor 431 is coaxially connected to the dual-axis lead screw 432. The two elbow mounting parts 42 are located at both ends of the dual-axis lead screw 432. The elbow mounting parts 42 are provided with threaded holes adapted to the dual-axis lead screw 432 and through holes adapted to the guide rod 433. By driving the dual-axis lead screw 432 to rotate through the drive motor 431, the two sets of elbow mounting parts 42 can be driven to move simultaneously toward or away from each other, thereby causing the two elbows 7 to move simultaneously. After the ends of the elbows 7, the buried pipe 5 and the four-way pipe 6 are heat-fused, one of the elbows 7 moves toward the buried pipe 5 and connects to the buried pipe 5, and the other elbow 7 moves toward the four-way pipe 6 and connects to the four-way pipe 6.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for hot melt joining of PPR pipes, characterized in that, include: The frame (1) is provided with abutting parts (11) on both sides for abutting against the side wall of the trench; Two sets of clamping mechanisms (2) are set at both ends of the bottom of the frame (1) for clamping the cut-off buried pipe (5); The first installation mechanism (3) is set on one side of the frame (1) and is used to install a tee or cross pipe (6) to one of the cross sections of the buried pipeline (5); The second installation mechanism (4) is located on the other side of the frame (1). The second installation mechanism (4) includes two support seats (41) and two elbow mounting parts (42) are provided between the two support seats (41). One of the elbow mounting parts (42) is used to install the elbow (7) onto the tee pipe or cross pipe (6), and the other elbow mounting part (42) is used to install the elbow (7) onto another section of the buried pipeline (5). A transverse component (43) is also provided between the two support seats (41) to drive the two elbow mounting parts (42) to move towards each other or away from each other. The elbow mounting component (42) includes a mounting base (421), on which a vertical frame (422) and a lifting component (423) for driving the vertical frame (422) to rise and fall are provided along the vertical direction. A horizontal seat (424) is provided on both sides of the bottom of the vertical frame (422). An elbow support (425) is slidably provided on the bottom of each of the two horizontal seats (424) along its own length direction. A clamping cavity adapted to the shape of the elbow (7) is opened on the side of the two elbow supports (425) that are close to each other. The transverse seat (424) is provided with a limiting member (426) for limiting the position of the elbow support (425) so that the two elbow supports (425) can abut against the two sides of the elbow (7). The bottom of the lifting member (423) is provided with a loosening member (427) for separating the limiting member (426) from the transverse seat (424). The loosening member (427) can drive the limiting member (426) to release the limitation on the position of the elbow support (425). The first installation mechanism (3) includes an installation frame (31), which is slidably disposed in the frame (1) along the length direction of the frame (1). The frame (1) is provided with a transverse electric cylinder (32) for driving the installation frame (31) to move. An installation frame (33) is provided in the installation frame (31). The installation frame (33) has multiple legs (331). Each leg (331) has an arc-shaped bottom rod (332) at the bottom for defining the position of a three-way pipe or a four-way pipe (6). The arc-shaped bottom rod (332) is rotatably disposed on the leg (331). An abutment (34) for maintaining the position of the arc-shaped bottom rod (332) is disposed on the leg (331). The mounting bracket (33) has a top plate (333) on top, and a flattening component (35) for flattening a tee or cross pipe (6) is slidably disposed on the top plate (333). The flattening component (35) includes a flat plate (351) and a flattening rod (352). The flat plate (351) is fixedly disposed at the bottom end of the flattening rod (352). A clamping component (36) for clamping the flattening rod (352) is also disposed on the top plate (333).

2. The PPR pipe hot melt connecting device according to claim 1, characterized in that, The top of the elbow support (425) is provided with a sliding rod (4251), and the bottom surface of the transverse seat (424) is provided with a sliding groove for the sliding rod (4251) to slide. A return spring (4252) is connected between the sliding rod (4251) and the end wall of the sliding groove. The limiting member (426) is a limiting block. The limiting block is slidably disposed on the sliding rod (4251) in the vertical direction. The transverse seat (424) is provided with a through groove for the limiting block to move out. When the two elbow supports (425) move towards each other to the end of the sliding groove, the limiting block can extend out of the through groove to limit the position of the sliding rod (4251).

3. The PPR pipe hot-melt connection device according to claim 1, characterized in that, The lifting component (423) includes a lifting electric cylinder (4231). The cylinder of the lifting electric cylinder (4231) is fixedly mounted on the horizontal seat (424). An ear plate (4221) is provided on the vertical frame (422). The piston rod of the lifting electric cylinder (4231) passes through the ear plate (4221) and has a drive plate (4232) at its end. The drive plate (4232) is located below the ear plate (4221) and can support the ear plate (4221).

4. The PPR pipe hot-melt connection device according to claim 3, characterized in that, The release element (427) is a release rod, which is fixedly installed at the bottom of the drive plate (4232) and located directly above the limiting element (426). When the elbow (7) is heat-fused, the lifting cylinder (4231) drives the drive plate (4232) to move downward, and the release rod can drive the limiting element (426) to release the limitation on the position of the elbow support (425).

5. The PPR pipe hot-melt connection device according to claim 1, characterized in that, The transverse assembly (43) includes a drive motor (431), a dual-axis lead screw (432), and a guide rod (433). The dual-axis lead screw (432) is rotatably connected between two support seats (41), and the guide rod (433) is fixedly connected between the two support seats (41). The drive motor (431) is fixedly mounted on one of the support seats (41), and the output shaft of the drive motor (431) is coaxially connected with the dual-axis lead screw (432). The two elbow mounting parts (42) are located at both ends of the dual-axis lead screw (432). The elbow mounting parts (42) are provided with threaded holes adapted to the dual-axis lead screw (432) and through holes adapted to the guide rod (433).

6. The PPR pipe hot-melt connection device according to claim 1, characterized in that, The abutment member (34) includes an abutment rod (341), which is slidably disposed on the support leg (331) along the length direction of the support leg (331). An abutment block (342) is provided at the bottom end of the abutment rod (341). When the bottom height of the abutment block (342) is lower than the bottom height of the support leg (331), the abutment block (342) can abut against the arc-shaped bottom rod (332) and restrict the arc-shaped bottom rod (332) from flipping.

7. The PPR pipe hot-melt connection device according to claim 1, characterized in that, The pressing rod (352) is slidably disposed in the top plate (333). The four corners of the pressing plate (351) are provided with sliders (3511). The support leg (331) is provided with a sliding groove for the sliders (3511) to slide. The bottom surface of the pressing plate (351) is provided with a groove that matches the shape of the three-way pipe or four-way pipe (6).

8. The PPR pipe hot-melt connection device according to claim 7, characterized in that, The clamping component (36) includes a rotating bracket (361) rotatably mounted on the top plate (333), the rotating bracket (361) being internally threaded with a clamping screw (362), and a clamping block (363) being provided on the clamping screw (362).

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