An electrically fused welding implement

Abstract

The utility model discloses an electric melting type welding machine tool, including the trolley, trolley includes the lower board, the brake castor of lower board bottom area, be located the upper plate of lower board top, the lower board top is equipped with the spacing frame, and the electric welding machine is inserted in the spacing frame, the upper plate top is equipped with the clamping subassembly, the end face processing group and the circumferential surface processing group, and the clamping subassembly includes lower clamping block and upper clamping block, and lower clamping block and upper clamping block can cooperate and hold polyethylene pipe, and the end face processing group includes the rotating turntable that can rotate, and the second scraping knife for polyethylene pipe end face scraping is installed on the rotating turntable, and the circumferential surface processing group includes the first rotating plate that can rotate, and the first scraping knife for polyethylene pipe radial surface scraping is installed on the first rotating plate. Through setting trolley, equipment can be moved to different stations flexibly, and the stable positioning is realized with the help of brake castor, and the end face cleaning of polyethylene pipe and the outer surface treatment and last clamping welding are completed on the same platform.

Description

Technical Field

[0001] This utility model relates to the field of welding machine technology, and in particular to an electrofusion welding tool. Background Technology

[0002] Electrofusion welding is a specialized technique for connecting polyethylene pipes. Its principle involves applying current to a metal resistance wire embedded in the inner wall of the pipe fitting. This heats the wire and conducts it to the surrounding polyethylene material, gradually melting the interface area. The heat is converted from electrical energy, and precise control of the current and duration ensures a uniform molten layer without scorching. During the melting process, the pipe and fitting ends are tightly bonded under internal pressure, fusing together upon cooling to form a high-strength, well-sealed integral joint.

[0003] In existing technologies, the surface treatment of polyethylene pipes typically involves manual scraping with a handheld scraper. Operators must repeatedly and forcefully scrape away the oxide layer from the pipe surface, resulting in high labor intensity, low efficiency, and inconsistent scraping depth due to uneven force. Prolonged operation using this method easily leads to hand fatigue and makes it difficult to guarantee the smoothness and consistency of the processed surface, especially in large-scale construction projects. Furthermore, manual scraping poses safety hazards; slippage of the scraper can cause cuts and injuries. Utility Model Content

[0004] The purpose of this invention is to provide an electrofusion welding machine to solve the problem of low work efficiency of manual hand-held scraping operations mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an electrofusion welding machine, comprising a pusher trolley, the pusher trolley including a lower plate, braked casters at the bottom of the lower plate, and an upper plate located above the lower plate, a limiting frame provided at the top of the lower plate, an electrofusion welding machine inserted into the limiting frame, a clamping assembly, an end face processing group, and a circumferential surface processing group provided at the top of the upper plate, the clamping assembly including a lower clamping block and an upper clamping block, the lower clamping block and the upper clamping block being able to cooperate to clamp a polyethylene pipe, the end face processing group including a rotatable turntable, on which a second scraping knife for scraping the end face of the polyethylene pipe is installed, the circumferential surface processing group including a rotatable first rotating plate, on which a first scraping knife for scraping the radial surface of the polyethylene pipe is installed.

[0006] In a preferred embodiment of this technical solution, the clamping assembly further includes a gantry frame disposed on the top of the upper plate. The gantry frame contains a guide rod that passes through the lower clamping block and the upper clamping block. A lead screw is also rotatably connected inside the gantry frame. A first motor for driving the lead screw to rotate is disposed at the bottom of the upper plate.

[0007] In the preferred embodiment of this technical solution, the lower clamping block and the upper clamping block each include a plate body, a clamping plate is provided on the plate body, and a clamping groove is provided on the clamping plate. The clamping grooves of the lower clamping block and the upper clamping block are arranged opposite to each other. The plate body of the lower clamping block is provided with a through hole for avoiding the lead screw, and the plate body of the upper clamping block is provided with a screw hole corresponding to the lead screw. A spring is sleeved between the lower clamping block and the upper clamping block corresponding to the outer diameter of the guide rod.

[0008] Based on the preferred embodiment of this technical solution, the bottom of the upper plate is provided with a second motor for driving the first rotating plate to rotate. The first rotating plate is interference-fitted with a casing thrust ball bearing for contacting the end face of the polyethylene pipe. The first scraper on the first rotating plate can conform to the outer wall of the polyethylene pipe and make a circular motion.

[0009] Based on the preferred embodiment of this technical solution, the top of the first rotating plate is provided with a first column, the top of the first column is provided with a limiting plate, the top of the limiting plate is provided with a second column, and a deep groove ball bearing is inserted into the second column with an interference fit, and a polyethylene pipe can be inserted into the outer diameter of the deep groove ball bearing.

[0010] According to the preferred embodiment of this technical solution, the first scraping blade includes a first fixed base connected to the first rotating plate by screws, and the first blade body is integrally formed on the first fixed base.

[0011] Based on the preferred embodiment of this technical solution, an mounting frame is installed on the upper plate, the turntable is rotatably connected to the mounting frame, a third motor that drives the turntable to rotate is also installed on the mounting frame, and a plug tube is fixed on the upper plate, into which a polyethylene tube can be inserted.

[0012] According to the preferred embodiment of this technical solution, the second scraper includes a second fixed base and a second blade body integrally formed on the second fixed base.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. By setting up a pusher trolley, the equipment can be flexibly moved to different work positions and achieve stable positioning with the help of casters with brakes, adapting to complex construction site environments.

[0015] 2. The end face cleaning, outer surface treatment, and final clamping welding of polyethylene pipes are completed on the same platform, which provides convenience in use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of an electrofusion welding machine according to the present invention;

[0017] Figure 2 This is a schematic diagram of the upper clamping block structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the gantry structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the first rotating plate structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the turntable structure of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 10. Polyethylene pipe; 1. Pushing trolley; 11. Lower plate; 111. Limiting frame; 12. Upper plate; 13. Casters with brakes; 2. Electrofusion welding machine; 3. Clamping assembly; 301. Plate body; 302. Clamping plate; 303. Clamping groove; 31. Gantry frame; 32. Lower clamping block; 33. Upper clamping block; 34. Lead screw; 341. First motor; 35. Guide rod; 36. Spring; 4. 41. End face machining group; 42. Mounting bracket; 43. Turntable; 44. Third motor; 45. Second scraper; 46. Insert cylinder; 57. Circumferential surface machining group; 51. First rotating plate; 512. First column; 513. Limiting plate; 52. Second column; 53. First scraper; 54. First blade body; 55. First fixed seat; 56. Deep groove ball bearing; 57. Encased thrust ball bearing; 58. Second motor. Detailed Implementation

[0022] Electrofusion welding, as an advanced plastic pipe connection technology, is widely used in the connection of thermoplastic pipes such as polyethylene (PE) and polypropylene (PP), especially in engineering fields such as gas, water supply, drainage, and chemical transportation, demonstrating significant technical advantages and broad application prospects. Its core principle involves pre-embedding a metal resistance wire inside the pipe fitting. Electrical energy is converted into heat energy, causing the resistance wire to heat up and be evenly conducted to the contact interface between the pipe and the fitting. This causes the polyethylene material to partially melt, achieving molecular-level fusion under pressure. After cooling, a structurally complete and reliably sealed integrated joint is formed. Compared to traditional hot-melt butt welding or manual connection methods, electrofusion welding has many outstanding advantages. First, the welding process is highly automated. Simply insert the pipe into the electrofusion fitting, fix it, and start the equipment to automatically complete the entire heating and cooling process. It eliminates the need for operator experience and judgment, greatly reducing the impact of human factors on weld quality and ensuring the consistency and reliability of the joint. Secondly, electrofusion welding requires no open flame or external heating plate, resulting in high operational safety. It is particularly suitable for confined spaces, high-altitude operations, or flammable and explosive environments, such as urban gas pipeline renovation and underground pipe gallery construction, effectively avoiding the risks of fire and burns. Thirdly, although this process requires high flatness and cleanliness of the pipe end face, the integrated automatic scraping device for the end face and circumference of this invention can efficiently and uniformly remove oxide layers and contaminants, ensuring a clean welding interface and further improving the welding quality. Simultaneously, electrofusion pipe fittings offer flexible design, enabling various complex connection forms such as reducing diameters, tees, and elbows. They are highly adaptable and easy to construct, especially suitable for site environments with limited space or where large equipment operations are difficult. Furthermore, electrofusion welded joints exhibit excellent mechanical properties. Testing shows that their tensile strength, internal pressure resistance, and resistance to environmental stress cracking all reach or even exceed those of the pipe itself. They demonstrate good long-term operational stability and a service life of over 50 years, meeting the high durability requirements of modern infrastructure. With the acceleration of urbanization in my country, the surge in demand for underground pipeline network upgrades and renovations, and the increased promotion of clean energy (such as natural gas) under the "dual carbon" target, the demand for polyethylene pipeline systems continues to grow. Electrofusion welding technology, as its core connection method, has an extremely broad market prospect. In the future, this technology will develop deeply towards intelligence and digitalization, integrating sensors, the Internet of Things, and big data technologies to achieve real-time monitoring of welding parameters, automatic quality assessment, and cloud-based data traceability, building a fully controllable intelligent welding system. For example, key parameters such as welding current, voltage, time, and ambient temperature can be uploaded to a management platform via Bluetooth or 4G / 5G modules. Combined with AI algorithms to analyze welding quality, timely warnings of anomalies can be issued, improving project management efficiency and safety. Simultaneously, the development of new low-power, high-precision electrofusion welding machines, and the introduction of electrofusion pipe fittings suitable for larger diameter and higher pressure rating pipes, will further expand its application boundaries.Driven by national strategies such as rural revitalization, integrated urban and rural water supply, and the popularization of natural gas in rural areas, electrofusion welding equipment will play a greater role in grassroots construction due to its advantages such as ease of operation, stable quality, and strong adaptability. In conclusion, electrofusion welding is not only a mature and reliable plastic pipe connection process, but also a crucial technological support for promoting the standardization, intelligence, and green development of pipeline engineering. Its technological value and market potential will continue to be released, making it an indispensable key link in modern pipeline construction.

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-5 This utility model provides an embodiment: an electrofusion welding machine, including a pusher trolley 1, the pusher trolley 1 including a lower plate 11, braked casters 13 at the bottom of the lower plate 11, and an upper plate 12 located above the lower plate 11. A limiting frame 111 is provided at the top of the lower plate 11, and an electrofusion welding machine 2 is inserted into the limiting frame 111. A clamping assembly 3, an end face processing group 4, and a circumferential surface processing group 5 are provided at the top of the upper plate 12. The clamping assembly 3 includes a lower clamping block 32 and an upper clamping block 33, which can cooperate to clamp a polyethylene pipe 10. The end face processing group 4 includes a rotatable turntable 42, on which a second scraper 43 for scraping the end face of the polyethylene pipe 10 is installed. The circumferential surface processing group 5 includes a rotatable first rotating plate 51, on which a first scraper 52 for scraping the radial surface of the polyethylene pipe 10 is installed. By setting up a pusher trolley 1, the equipment can be flexibly moved to different work positions and achieve stable positioning with the help of braked casters 13, adapting to complex construction site environments. At the same time, the end face cleaning and outer surface treatment of the polyethylene pipe 10 and the final clamping welding are completed on the same platform, providing convenience in use.

[0025] Please see Figure 1-5A further embodiment of this solution includes: the clamping assembly 3 further includes a gantry frame 31 disposed on the top of the upper plate 12. The gantry frame 31 contains a guide rod 35 that passes through the lower clamping block 32 and the upper clamping block 33. A lead screw 34 is also rotatably connected within the gantry frame 31. A first motor 341 for driving the lead screw 34 to rotate is disposed at the bottom of the upper plate 12. By integrating the transmission system of the lead screw 34 and the guide rod 35 through the structure of the gantry frame 31, and cooperating with the motor drive, automated opening and closing control of the clamping assembly 3 is achieved, which is simple to operate and responds quickly. The guide rod 35 effectively prevents the upper clamping block 33 from tilting during lifting, improves clamping coaxiality, ensures the stability of the polyethylene pipe 10 during processing, and reduces vibration and eccentricity errors. The first motor 341 has a braking function.

[0026] Please see Figure 1-5 A further embodiment of this solution is as follows: the lower clamping block 32 and the upper clamping block 33 each include a plate 301, a clamping plate 302 is provided on the plate 301, and a clamping groove 303 is provided on the clamping plate 302. The clamping grooves 303 of the lower clamping block 32 and the upper clamping block 33 are arranged opposite to each other. The plate 301 of the lower clamping block 32 is provided with a through hole to avoid the lead screw 34, and the plate 301 of the upper clamping block 33 is provided with a screw hole corresponding to the lead screw 34. A spring 36 is sleeved between the lower clamping block 32 and the upper clamping block 33, corresponding to the outer diameter of the guide rod 35. The clamping groove 303 is designed to match the outer diameter of the polyethylene pipe 10 to ensure a firm clamping. The spring 36 can provide buffering during the clamping process and reduce the impact of the lower clamping block 32 and the upper clamping block 33.

[0027] Please see Figure 1-4 A further solution based on this embodiment is as follows: A second motor 55 is provided at the bottom of the upper plate 12 to drive the first rotating plate 51 to rotate. A casing thrust ball bearing 54 is interference-fitted onto the first rotating plate 51 for contacting the end face of the polyethylene pipe 10. The first scraper 52 on the first rotating plate 51 can conform to the outer wall of the polyethylene pipe 10 and perform circumferential motion. The second motor 55 directly drives the first rotating plate 51 to rotate, resulting in efficient power transmission. The casing thrust ball bearing 54, in contact with the end face of the polyethylene pipe 10, provides axial support, reducing the possibility of the polyethylene pipe 10 rotating along with it, and making it easier for the operator to grip and perform processing operations.

[0028] Please see Figure 1-4A further embodiment of this solution is as follows: A first column 511 is provided at the top of the first rotating plate 51; a limiting plate 512 is provided at the top of the first column 511; a second column 513 is provided at the top of the limiting plate 512; a deep groove ball bearing 53 is interference-fitted into the second column 513; and a polyethylene tube 10 can be inserted into the outer diameter of the deep groove ball bearing 53. The deep groove ball bearing 53, mounted at the top, provides peripheral centering support for the polyethylene tube 10, preventing radial runout or displacement during processing. The rolling characteristics of the bearing reduce frictional resistance.

[0029] Please see Figure 2-5 A further embodiment of this solution is as follows: the first scraping blade 52 includes a first fixing base 522 connected to the first rotating plate 51 by screws, and a first blade body 521 is integrally formed on the first fixing base 522. The first scraping blade 52 adopts a bolt-detachable connection method, which facilitates quick replacement and maintenance after blade wear.

[0030] Please see Figure 2-5 A further solution based on this embodiment is as follows: a mounting bracket 41 is installed on the upper plate 12, and a turntable 42 is rotatably connected to the mounting bracket 41. A third motor 421 for driving the turntable 42 to rotate is also installed on the mounting bracket 41. A plug 44 is also fixed on the upper plate 12, and a polyethylene tube 10 can be inserted into the plug 44. The mounting bracket 41 and the third motor 421 work together to drive the turntable 42 to rotate, realizing automated operation of end face processing and eliminating the trouble of manual scraping. The plug 44 provides auxiliary positioning and support for the polyethylene tube 10, preventing axial movement or bending deformation during end face scraping, and ensuring the flatness of the end face.

[0031] Please see Figure 2-5 A further embodiment of this solution is as follows: the second scraper 43 includes a second fixed base and a second blade body integrally formed on the second fixed base. The second scraper 43 has a simple structure and low manufacturing cost. The integrally formed blade body has good rigidity and wear resistance, and can efficiently remove the oxide layer on the end face of the polyethylene pipe 10 under the drive of the turntable 42. The scraping depth of the end face and the circumferential surface is about 0.1 mm to 0.2 mm. Even if there is a slight deviation, it will not have a significant impact. The scraping is used to remove the oxide layer on the polyethylene pipe 10.

[0032] Working principle: First, the surfaces of the two polyethylene pipes 10 to be welded are pre-treated. Taking only one polyethylene pipe 10 as an example, one end of the polyethylene pipe 10 is inserted into the insert 44 on the upper plate 12 for positioning, while the other end is held and supported by the operator. The third motor 421 is started, driving the turntable 42 to rotate. The second scraping blade 43 on the turntable 42 then performs a circumferential scraping on the end face of the polyethylene pipe 10 to remove the surface oxide layer. The scraping depth is controlled to be approximately 0.1 to 0.2 millimeters. After the end face treatment is completed, the third motor 421 is turned off, and the operator manually pulls the polyethylene pipe 10 out of the insert 44. Next, circumferential surface treatment is performed: the polyethylene pipe 10 is then inserted into the outer diameter of the deep groove ball bearing 53. Here, the first cutter 521 will create certain cuts on the surface of the polyethylene pipe 10. The second motor 55 is started, driving the first rotating plate 51 to rotate. The first scraping blade 52 on the first rotating plate 51 moves in a circular motion against the outer wall of the polyethylene pipe 10, scraping its radial surface to remove the oxide layer and improve the activity of the welding interface. During this process, the operator holds the unprocessed end of the polyethylene pipe 10 to prevent it from passively rotating due to the rotation of the first rotating plate 51. At the same time, the deep groove ball bearing 53 at the top of the first rotating plate 51 provides peripheral centering support for the polyethylene pipe 10, reducing radial runout. The sheathed thrust ball bearing 54 makes slight contact with the end face of the polyethylene pipe 10, playing an axial limiting role and improving scraping stability. After completing the end face and outer surface treatment of the first polyethylene pipe 10, the same process is followed for the second polyethylene pipe 10. After both polyethylene pipes 10 are cleaned, they are inserted from both ends into the sockets of an electrofusion socket fitting (i.e., an "electrofusion receiving fitting with an embedded resistance heating wire") to achieve preliminary splicing, forming an overall structure of "left pipe - electrofusion fitting - right pipe". Subsequently, the assembly is installed between the clamping components 3 of the welding machine, with the electrofusion fitting in the middle and the two polyethylene pipes 10 extending to either side. After adjusting the position appropriately, the first motor 341 is started, driving the lead screw 34 to rotate, which in turn drives the upper clamping block 33 downwards along the guide rod 35, coordinating with the lower clamping block 32 to stably clamp the assembly. After clamping, the output cable of the electrofusion welding machine 2 is connected to the electrode connector of the electrofusion socket fitting. The electrofusion welding machine 2 is started and energized according to the set parameters to heat the resistance wire inside the fitting, heating the contact area between the polyethylene pipe 10 and the socket fitting to a molten state. After cooling, a high-strength, well-sealed welded joint is formed. After welding is completed, release the clamping assembly 3 and remove the welded pipe section. The entire equipment is mounted on a push trolley 1, allowing for flexible movement on the construction site. Braked casters 13 ensure stability during processing and welding, achieving integrated, efficient, and standardized polyethylene pipe 10 welding operations.The equipment manufacturer also contributed to the operation control method of this device. An electrical control box is integrated inside the pusher trolley 1, containing a main control module, a power management unit, a communication module, and a parameter storage unit. The main control module is electrically connected to the first motor 341, the second motor 55, the third motor 421, and the electrofusion welding machine 2, coordinating the action sequence and operating parameters of each actuator. The communication module is a Bluetooth communication unit, supporting wireless connection with external mobile terminals. The device can be paired with a remote control unit, which is a handheld wireless controller or a smartphone / tablet APP with a built-in Bluetooth module, enabling pairing with the communication module on the device. Operators can send commands from a certain distance via the remote control unit. The operator's actions are uploaded to the cloud for later review. The wiring methods, usage of the electrofusion welding machine 2, usage of electrical components, and the methods for uploading the main control module, power management unit, communication module, parameter storage unit, and welding parameter information to the cloud are all existing technologies, and their working principles will not be elaborated further.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electrofusion welding machine, characterized in that: The trolley (1) includes a lower plate (11), a caster wheel (13) with brakes at the bottom of the lower plate (11), and an upper plate (12) located above the lower plate (11). A limiting frame (111) is provided at the top of the lower plate (11), and an electrofusion welding machine (2) is inserted into the limiting frame (111). A clamping assembly (3), an end face machining group (4), and a circumferential surface machining group (5) are provided at the top of the upper plate (12). The clamping assembly (3) includes a lower clamping block (32) and an upper clamping block (33). The lower clamping block (32) and the upper clamping block (33) can cooperate to clamp the polyethylene pipe (10). The end face processing group (4) includes a rotatable turntable (42) on which a second scraper (43) for scraping the end face of the polyethylene pipe (10) is mounted. The circumferential surface processing group (5) includes a rotatable first rotating plate (51) on which a first scraper (52) for scraping the radial surface of the polyethylene pipe (10) is mounted.

2. The electrofusion welding machine according to claim 1, characterized in that: The clamping assembly (3) also includes a gantry (31) set on the top of the upper plate (12). The gantry (31) is provided with a guide rod (35) that passes through the lower clamping block (32) and the upper clamping block (33). A lead screw (34) is also rotatably connected inside the gantry (31). A first motor (341) for driving the lead screw (34) to rotate is provided at the bottom of the upper plate (12).

3. The electrofusion welding machine according to claim 2, characterized in that: The lower clamping block (32) and the upper clamping block (33) each include a plate (301), a clamping plate (302) is provided on the plate (301), a clamping groove (303) is provided on the clamping plate (302), the clamping grooves (303) of the lower clamping block (32) and the upper clamping block (33) are arranged opposite to each other, the plate (301) of the lower clamping block (32) is provided with a through hole for avoiding the lead screw (34), the plate (301) of the upper clamping block (33) is provided with a screw hole corresponding to the lead screw (34), and a spring (36) is sleeved between the lower clamping block (32) and the upper clamping block (33) corresponding to the outer diameter of the guide rod (35).

4. The electrofusion welding machine according to claim 3, characterized in that: The bottom of the upper plate (12) is provided with a second motor (55) for driving the first rotating plate (51) to rotate. The first rotating plate (51) is provided with an interference fit for contacting the end face of the polyethylene pipe (10). The first scraper (52) on the first rotating plate (51) can fit against the outer wall of the polyethylene pipe (10) and make a circular motion.

5. The electrofusion welding tool according to claim 4, characterized in that: The first rotating plate (51) has a first column (511) at the top, a limiting plate (512) at the top of the first column (511), a second column (513) at the top of the limiting plate (512), and a deep groove ball bearing (53) is inserted into the second column (513) with an interference fit. A polyethylene pipe (10) can be inserted into the outer diameter of the deep groove ball bearing (53).

6. The electrofusion welding machine according to claim 5, characterized in that: The first scraper (52) includes a first fixed base (522) connected to the first rotating plate (51) by screws, and the first blade body (521) is integrally formed on the first fixed base (522).

7. The electrofusion welding machine according to claim 6, characterized in that: An mounting bracket (41) is installed on the upper plate (12), and a turntable (42) is rotatably connected to the mounting bracket (41). A third motor (421) for driving the turntable (42) to rotate is also installed on the mounting bracket (41). A plug tube (44) is also fixed on the upper plate (12), and a polyethylene tube (10) can be inserted into the plug tube (44).

8. The electrofusion welding machine according to claim 7, characterized in that: The second scraper (43) includes a second fixed base and a second blade body integrally formed on the second fixed base.

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