Large-diameter PPR pipeline hot melting butt joint device with plug rod locking structure and butt joint method

Abstract

The application discloses a large-diameter PPR pipeline hot-melt butt joint device with a plug rod locking structure and a method, and relates to the technical field of pipeline construction. The device comprises a base, a moving guide rail, a fixed clamping assembly, a moving seat, a moving clamping assembly and a hot-melt assembly. The moving clamping assembly comprises first and second arc-shaped clamping pieces, which are hingedly connected at one end and are arranged in axial staggered positions along the clamping cavity. When the first arc-shaped clamping piece is rotated and folded, the two arc-shaped clamping pieces are axially staggered and overlapped to adjust the pipe diameter. After the positioning holes are aligned, the locking plug rod can be inserted to be locked without tools. A metal baffle is arranged at the front end of the guide rail to provide a vertical positioning reference for the hot-melt heating plate. The application eliminates the need for auxiliary wrench tools, and one person can efficiently and labor-savingly complete the variable-diameter clamping and high-precision butt joint, effectively prevents the butt joint from being incorrectly melted, and is extremely suitable for narrow pump room space construction.

Description

Technical Field

[0001] This invention relates to the field of pipeline construction technology, and in particular to a hot-melt butt welding device and method for large-diameter PPR pipelines with a locking structure and a plug. Background Technology

[0002] Currently, in the hot-melt construction of large-diameter PPR pipes for the renovation of pump rooms in industrial and mining enterprises and municipal pipe networks, the following two types of equipment are mainly relied upon: The first type is the commercial integrated hydraulic hot melt machine frame. This type of machine is large in size and heavy in weight, making it extremely difficult to transport to the pump room mezzanine or narrow pipe gallery for construction. In addition, the equipment purchase cost is high, and the hydraulic structure has the potential for oil leakage and complex maintenance problems after long-term use.

[0003] The second type is the simple support made on-site. These supports typically lack a rack-and-pinion uniform feed structure, making the pipe pushing force uncontrollable and easily causing uneven docking pressure. Furthermore, their clamping parts are usually only equipped with small nuts and knobs; for large-diameter pipes with significant weight, the tightening torque is insufficient, requiring workers to carry additional tools such as adjustable wrenches. However, wrench rotation is severely restricted in the confined space of the machine room, and tools are easily lost. Simultaneously, these simple supports lack a vertical end-face limiting structure, making the hot-melt heating plate prone to misalignment, leading to pipe end-face misalignment, incomplete melting, and frequent leaks at the joints later. Due to these structural defects, existing equipment often requires multiple workers to operate, making it impossible for a single person to perform precise, independent work. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a large-diameter PPR pipe hot-melt butt welding device and method with a locking structure for inserting rods.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows: On one hand, the present invention provides a large-diameter PPR pipe hot-melt butt welding device with a locking rod structure, comprising: a base; a movable guide rail fixedly mounted on the base; a fixed clamping assembly mounted on the movable guide rail for clamping a first pipe fitting to be butt welded; and a movable clamping assembly for clamping a second pipe fitting to be butt welded. The movable clamping assembly includes a movable seat slidably mounted on the movable guide rail and a pipe fitting clamping assembly mounted on the movable seat. The pipe fitting clamping assembly includes a first arc-shaped clamping member, a second arc-shaped clamping member, and a locking rod. The second arc-shaped clamping member is fixedly mounted on the movable seat, and the first end of the first arc-shaped clamping member is connected to the second arc-shaped clamping member. The first end of the arc-shaped clamping member is hinged, so that the first arc-shaped clamping member and the second arc-shaped clamping member form a clamping cavity for clamping the pipe fitting. The first arc-shaped clamping member and the second arc-shaped clamping member are staggered along the axial direction of the clamping cavity. A first positioning hole is opened through the second end of the first arc-shaped clamping member. The second arc-shaped clamping member has several second positioning holes, and the several second positioning holes are all located on the displacement path of the first positioning hole. A locking rod is used to be inserted into the first positioning hole and the target second positioning hole when the first positioning hole is aligned with the target second positioning hole. A heat fusion assembly is used to heat the mating surface of the pipe fitting to be mated.

[0006] On the other hand, the present invention provides a method for hot-melt butt welding of large-diameter PPR pipes with a locking structure, the method comprising the following steps: Step S1: Place the first pipe fitting to be connected on the fixed clamping assembly and limit and fix it; place the second pipe fitting to be connected in the second arc-shaped clamping member of the movable clamping assembly; Step S2: Rotate the first arc-shaped clamping member around the hinge end to close it to the second arc-shaped clamping member. When the first positioning hole on the first arc-shaped clamping member is aligned with the target second positioning hole that matches the actual diameter of the second pipe fitting to be connected, insert the locking rod through the first positioning hole and the target second positioning hole to lock the second pipe fitting to be connected. Step S3: Place the hot melt heating plate of the hot melt assembly between the end faces of the first and second pipe fittings to be connected, and position the hot melt heating plate against the metal baffle; start heating, drive the moving seat to slide along the moving guide rail towards the metal baffle, so that the end faces of the second and first pipe fittings to be connected press against the two sides of the hot melt heating plate for heating and melting. Step S4: After the mating surfaces of the two pipe fittings have melted to a preset degree, drive the moving seat to move backward and remove the heating plate of the hot melter; then drive the moving seat forward again to press the molten surfaces of the first and second pipe fittings to be mated tightly together, and complete the mating after pressure holding and cooling.

[0007] The beneficial effects of this invention are: (1) This invention adopts a technical solution in which the first and second arc-shaped clamping parts are arranged in an axially staggered manner, so that there is no mechanical interference at the end face when the two are closed inward, and they can be staggered to reduce the radial size of the clamping cavity. With the cooperation of several positioning holes preset on the rotation trajectory, and after matching the target positioning hole with the corresponding pipe diameter, the worker only needs to insert the locking rod to complete the mechanical interlock. This structure completely avoids the traditional locking method that requires an adjustable wrench to tighten the nut, and solves the problem of limited tool operation and easy loss in the narrow pump room.

[0008] (2) This invention provides an absolutely vertical physical positioning reference surface for the heating plate of the hot melt machine by setting a vertical metal baffle at the front end of the moving guide rail, ensuring that the end face of the pipe is completely parallel to the heating plate; at the same time, in conjunction with the positioning groove on the fixed clamping assembly, the "radial flange" of the pipe joint itself is cleverly used for axial locking. This bidirectional rigid limiting mechanism ensures that the heavy pipe does not move axially or slip during hot melt pressure, making the joint depth uniform and greatly reducing the rework rate of interface leakage.

[0009] (3) The present invention relies on the mechanical meshing of the rack and the drive gear. The worker only needs to crank the rotary drive rod with one hand to achieve a smooth and uniform feed of the pipe. With the positioning screw, the position of the moving seat can be locked at any time. Combined with the above-mentioned convenient plug locking structure, the device simplifies the process that traditionally requires 2-3 people to complete to only 1 person.

[0010] (4) The present invention uses two parallel load-bearing channel steels to form a ground-integrated base, which has a low center of gravity and is extremely stable. It can be operated directly on the narrow pump room floor without drilling. The entire device has a simple structure and can be made entirely from scrap steel on the construction site. The cost per unit is extremely low. At the same time, it adopts a pure mechanical structure with no electrical vulnerable parts. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the large-diameter PPR pipe hot-melt butt welding device with a locking rod structure provided by the present invention. Figure 2 This is a schematic diagram of the pipe clamping assembly in the large-diameter PPR pipe hot-melt butt welding device with a locking rod structure provided by the present invention. The components include: 1. base; 2. movable guide rail; 3. fixed clamping assembly; 4. movable seat; 5. pipe clamping assembly; 6. first arc-shaped clamping component; 7. second arc-shaped clamping component; 8. second positioning hole; 9. metal baffle; 10. positioning groove; 11. rack; 12. transmission rod. Detailed Implementation

[0013] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0014] Example 1: As Figure 1 , Figure 2 As shown in the figure, this embodiment provides a large-diameter PPR pipe hot-melt butt welding device with a plug locking structure. The device mainly consists of a base 1, a moving guide rail 2, a fixed clamping assembly 3, a moving clamping assembly, and a hot-melt assembly.

[0015] Specifically, the base 1 uses two parallel load-bearing channel steels with pre-drilled hoisting holes on the sides, greatly facilitating the hoisting and transportation of the entire unit in the underground pump room mezzanine. The front and rear ends of the moving guide rail 2 are fixedly welded to the two load-bearing channel steels respectively. The moving clamping assembly is slidably mounted on the moving guide rail 2, allowing it to drive the second pipe fitting to be connected to move along the moving guide rail 2, realizing the heat fusion and connection of the pipe fitting.

[0016] The aforementioned movable clamping assembly includes a movable seat 4 slidably mounted on a movable guide rail 2 and a pipe clamping assembly 5 mounted on the movable seat 4. To address the problem of rapid clamping of straight pipes, elbows, and other pipe materials of different diameters (e.g., DN110~DN200), the pipe clamping assembly 5 mounted on the movable seat 4 adopts a staggered nested structure. Specifically, the pipe clamping assembly 5 includes a first arc-shaped clamping member 6 and a second arc-shaped clamping member 7. The bottom of the second arc-shaped clamping member 7 is rigidly welded to the movable seat 4 as a support base. The head end of the first arc-shaped clamping member 6 and the head end of the second arc-shaped clamping member 7 are hinged together by a long pin.

[0017] It should be noted that, in terms of spatial assembly, the first arc-shaped clamping member 6 and the second arc-shaped clamping member 7 are not located in the same vertical plane, but rather maintain a preset axial misalignment distance along the axis of the clamping cavity they enclose. When performing small-diameter clamping operations, force is applied to bring the first arc-shaped clamping member 6 downwards. Due to the aforementioned misalignment, the free end faces of the two will not physically interfere (collide), but will instead slide and overlap side by side in the axial direction, thereby achieving infinitely small reduction in the effective inner diameter of the clamping cavity until the anti-slip rubber pad on the inner wall tightly envelops the second pipe fitting to be connected.

[0018] In the locking mechanism, the movable end of the first arc-shaped clamping member 6 has a through-hole first positioning hole (which can be a through-hole sleeve), while on the tail end side wall of the second arc-shaped clamping member 7, multiple second positioning holes 8 are equidistantly opened along the arc rotation trajectory of the hinge axis. When the two clamps interlock and tighten around the pipe, the first positioning hole will inevitably rotate to the coaxial line of a target second positioning hole 8. At this time, the operator only needs to hold a rigid locking rod with one hand and insert it through the aligned hole to lock the clamp using mechanical shear resistance. To unlock, simply pull out the rod; the entire process requires no wrench or nut, making it extremely efficient and labor-saving.

[0019] In this embodiment, a rack 11 is fixedly installed on the side or top surface of the movable guide rail 2, and the rack 11 extends along the length direction of the movable guide rail 2. Correspondingly, a drive gear is rotatably installed inside the movable seat 4, and the drive gear meshes with the rack 11 on the movable guide rail 2. By controlling the rotation of the drive gear, the movable seat 4 can be driven to move back and forth along the movable guide rail 2.

[0020] A transmission rod 12 is coaxially fixed to the drive gear. One end of the transmission rod 12 extends outside the movable seat 4 and has a through mounting hole. One end of the matching rotary drive rod can be inserted into the mounting hole. By shaking the rotary drive rod, the operator can easily push the heavy, large-diameter pipe forward and backward at a uniform speed using the leverage effect of the gear and rack 11.

[0021] To ensure the positional stability of the movable seat 4 during the hot-melt and pressure-holding cooling stages, a positioning screw is threaded through the side of the movable seat 4, with one end extending into the movable seat 4. The positioning screw allows its end to be locked against the guide rail, thus achieving stepless parking lock.

[0022] To address the technical challenges of poor alignment accuracy and easy misalignment of pipe fittings, this embodiment features a large-area metal baffle 9 vertically welded to the foremost end of the moving guide rail 2. This metal baffle 9 serves as an absolute vertical reference surface, with the heating plate of the heat exchanger directly attached to its surface, thereby ensuring that the surface of the heating plate is absolutely perpendicular to the central axis of the pipe.

[0023] Furthermore, the fixing clamping assembly 3 is welded to the side of the metal baffle 9 facing the moving seat 4. This fixing clamping assembly 3 adopts a non-closed support form, with a U-shaped positioning groove 10 machined on its top. When clamping a pipe fitting with a flared joint or flange edge, the main body of the fitting lies flat within the positioning groove 10, and the front end face of the fitting is against the metal baffle 9. More importantly, the end face of the support facing the moving seat 4 abuts against the rear of the radial flange (stepped surface) formed at the diameter change point of the fitting end. Through the "front stop" of the metal baffle 9 and the "rear clamp" of the positioning groove 10 end face, absolute axial positioning of the fitting is achieved. When the moving seat 4 pushes another pipe forcefully against it, the fitting will not experience any axial backward movement or shifting, ensuring stable heat fusion pressure and uniform end face melting.

[0024] Example 2: This example provides a method for hot-melt butt welding of large-diameter PPR pipes with a locking structure, which includes the following steps: Step S1: Place the first pipe fitting to be connected on the fixed clamping assembly 3 and limit and fix it; place the second pipe fitting to be connected in the second arc-shaped clamping member 7 of the movable clamping assembly.

[0025] Specifically, the operator first loads the pipe fittings, placing the first fitting to be connected horizontally in the positioning groove 10 of the fixed clamping assembly 3. The radial flange of the fitting firmly abuts against the end face of the positioning groove 10, with a metal baffle 9 limiting its position from the front, thus achieving a purely passive and extremely reliable bidirectional axial positioning. Simultaneously, the second fitting to be connected is smoothly placed in the inner cavity of the second arc-shaped clamping member 7 on the movable seat 4, completing the initial support of the pipe.

[0026] Step S2: Rotate the first arc-shaped clamping member 6 around the hinge end so that it closes with the second arc-shaped clamping member 7. When the first positioning hole on the first arc-shaped clamping member 6 aligns with the target second positioning hole 8 that matches the actual diameter of the second pipe fitting to be connected, insert the locking rod through the first positioning hole and the target second positioning hole 8 to lock the second pipe fitting to be connected.

[0027] Specifically, the operator rotates the suspended first arc-shaped clamp 6 downwards around the hinge axis to close it. Due to the preset misalignment distance between the two in the axial direction, the ends of the first arc-shaped clamp 6 and the second arc-shaped clamp 7 will spatially overlap without mechanical interference. As the closure deepens, the radial dimension of the clamping cavity continuously decreases, and the inner wall tightly envelops the outer wall of the second pipe fitting to be connected. At this time, the operator observes the arc rotation trajectory of the first positioning hole. When it is completely aligned with the target second positioning hole 8 representing the current construction pipe diameter (such as DN110, DN160, etc. commonly used on site), the rigid locking rod is directly inserted through the two holes. Relying on the strong shear resistance of the metal material of the rod, the pipe is instantly locked. The entire locking process only takes a few seconds, completely eliminating the traditional operation of using two wrenches to tighten bolts.

[0028] Step S3: Place the hot melt heating plate of the hot melt assembly between the end faces of the first and second pipe fittings to be connected, and position the hot melt heating plate against the metal baffle 9; start heating, drive the moving seat 4 to slide along the moving guide rail 2 towards the metal baffle 9, so that the end faces of the second and first pipe fittings to be connected press against the two sides of the hot melt heating plate for heating and melting. Specifically, the hot melt machine is started. After the heating plate reaches the standard welding temperature of PPR pipes, the heating plate is vertically placed in the gap between the two pipe fitting end faces, and its surface is forced to press tightly against the side of the metal baffle 9. The metal baffle 9, as a rigid vertical reference surface, directly corrects the verticality of the heating plate, eliminating the problem of misalignment during hot melt welding at its source. Subsequently, the operator rotates the rotary drive rod clockwise. Through the meshing of the internal gear and the guide rail rack 11, the moving seat 4 and the second pipe fitting to be joined are driven forward smoothly and uniformly until the end faces of the two pipe fittings are pressed against the two sides of the heating plate. At this time, the worker tightens the positioning screw to lock the moving seat 4, maintaining a constant initial hot melt pressure, and waits for the pipe end faces to be heated and melted to produce a standard hot melt flange.

[0029] Step S4: After the mating surfaces of the two pipe fittings have melted to a preset degree, drive the moving seat 4 to move backward and remove the heating plate of the hot melter; then drive the moving seat 4 forward again to press the molten surfaces of the first pipe fitting to be mated and the second pipe fitting to be mated tightly together, and complete the mating after pressure holding and cooling.

[0030] Specifically, once the pipe end face is observed to have melted to the preset level, the operator quickly loosens the positioning screw and reverses the rotary drive rod to make the moving seat 4 quickly retreat, instantly pulling it upwards to remove it from the heating plate of the hot melt machine. Before the molten surface forms a skin, the rotary drive rod is reversed again to make the moving seat 4 advance quickly and uniformly, ensuring a tight fit between the molten end faces of the first and second pipe fittings to be connected. Due to the absolute linear guidance of the rack 11 guide rail and the absolute vertical limitation of the metal baffle 9, the weld after pressing is extremely uniform, without any incomplete melting or misalignment. After pressing is complete, the positioning screw is tightened for the last time to keep the entire device under constant mechanical pressure. After the weld has naturally cooled and solidified, the locking rod is pulled out and the pipe is removed, thus completing one large-diameter pipe connection operation.

[0031] In addition to the above embodiments, the present invention may have other implementation methods; all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A hot-melt butt welding device for large-diameter PPR pipes with a locking rod structure, characterized in that, include: Base (1); The movable guide rail (2) is fixedly mounted on the base (1); A fixed clamping assembly (3) is disposed on the movable guide rail (2) for clamping the first pipe fitting to be connected; A movable clamping assembly for clamping a second pipe fitting to be connected includes a movable seat (4) slidably disposed on the movable guide rail (2) and a pipe fitting clamping assembly (5) disposed on the movable seat (4). The pipe fitting clamping assembly (5) includes a first arc-shaped clamping member (6), a second arc-shaped clamping member (7), and a locking rod. The second arc-shaped clamping member (7) is fixedly disposed on the movable seat (4). The first end of the first arc-shaped clamping member (6) is hinged to the first end of the second arc-shaped clamping member (7), so that the first arc-shaped clamping member (6) and the second arc-shaped clamping member (7) are connected. The first arc-shaped clamping member (6) and the second arc-shaped clamping member (7) are arranged in a staggered manner along the axial direction of the clamping cavity. A first positioning hole is provided through the second end of the first arc-shaped clamping member (6), and a plurality of second positioning holes (8) are provided on the second arc-shaped clamping member (7). The plurality of second positioning holes (8) are all located on the displacement path of the first positioning hole. The locking rod is used to be inserted into the first positioning hole and the target second positioning hole (8) when the first positioning hole is aligned with the target second positioning hole (8). And, a heat-fusion assembly, used to heat the mating surfaces of the fittings to be connected.

2. The large-diameter PPR pipe hot-melt butt welding device with a locking structure for inserting a rod as described in claim 1, characterized in that, A metal baffle (9) is fixedly installed at one end of the moving guide rail (2), and the metal baffle (9) is installed in the vertical direction.

3. The large-diameter PPR pipe hot-melt butt welding device with a locking structure for inserting rods as described in claim 2, characterized in that, The fixed clamping assembly (3) is fixedly disposed on the side of the metal baffle (9) facing the movable clamping assembly. The fixed clamping assembly (3) includes a support for supporting the first pipe fitting to be connected. The upper end of the support is provided with a positioning groove (10) that is adapted to the radial flange at the end of the first pipe fitting to be connected.

4. The large-diameter PPR pipe hot-melt butt welding device with a locking structure for inserting a rod as described in claim 1, characterized in that, The movable guide rail (2) is provided with a rack (11) extending along its length direction. The movable seat (4) is rotatably provided with a drive gear that meshes with the rack (11). The movable clamping assembly also includes a translation drive assembly for driving the drive gear to rotate.

5. The large-diameter PPR pipe hot-melt butt welding device with a locking structure for inserting a rod as described in claim 4, characterized in that, A transmission rod (12) is coaxially fixed on the drive gear. One end of the transmission rod (12) extends outside the movable seat (4), and the end of the transmission rod (12) outside the movable seat (4) has a through hole. The translation drive assembly includes a rotary drive rod, one end of which can be embedded in the mounting hole.

6. The large-diameter PPR pipe hot-melt butt welding device with a locking structure for inserting a rod as described in claim 1, characterized in that, The side of the movable seat (4) is threaded with a positioning screw, one end of which extends into the movable seat (4) and can abut against the movable guide rail (2).

7. The large-diameter PPR pipe hot-melt butt welding device with a locking structure for inserting a rod as described in claim 1, characterized in that, The base (1) includes two parallel load-bearing channel steels. The movable guide rail (2) is fixedly installed on the two load-bearing channel steels and is perpendicular to the load-bearing channel steels. The side of the load-bearing channel steels is provided with a lifting hole.

8. A method for hot-melt butt welding of large-diameter PPR pipes with a locking structure, based on the hot-melt butt welding device for large-diameter PPR pipes with a locking structure as described in any one of claims 1 to 7, characterized in that, include: Step S1: Place the first pipe fitting to be connected on the fixed clamping assembly (3) and limit and fix it; place the second pipe fitting to be connected in the second arc-shaped clamping member (7) of the movable clamping assembly; Step S2: Rotate the first arc-shaped clamping member (6) around the hinge end so that it closes to the second arc-shaped clamping member (7). When the first positioning hole on the first arc-shaped clamping member (6) aligns with the target second positioning hole (8) that matches the actual diameter of the second pipe fitting to be connected, insert the locking rod through the first positioning hole and the target second positioning hole (8) to lock the second pipe fitting to be connected. Step S3: Place the hot melt heating plate of the hot melt assembly between the end faces of the first and second pipe fittings to be connected, and position the hot melt heating plate against the metal baffle (9); start heating, drive the moving seat (4) to slide along the moving guide rail (2) toward the metal baffle (9), so that the end face of the second pipe fitting to be connected and the end face of the first pipe fitting to be connected press against the two sides of the hot melt heating plate for heating and melting; Step S4: After the mating surfaces of the two pipe fittings have melted to a preset degree, drive the moving seat (4) to move backward and remove the heating plate of the hot melter; Then the moving seat (4) is driven forward again, so that the molten end faces of the first and second connectors to be connected are pressed tightly together, and the connection is completed after pressure holding and cooling.

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