Electric melting pipe fitting welding device

Abstract

The utility model discloses an electric melting pipe fitting welding device which comprises an installation base, a guide sliding groove, a threaded rod and a plurality of displacement assemblies. The guide sliding groove is fixed to the mounting base, and the threaded rod is arranged in the length direction of the guide sliding groove and is in linkage with the displacement assembly. The displacement assembly is provided with positioning clamps which are coaxially distributed, and each positioning clamp comprises a connecting support, a fixing disc, a clamping jaw and a driving disc. The clamping jaws are distributed in an annular array and can slide in the radial direction, and the driving disc is matched with pin shafts on the clamping jaws through arc-shaped guide grooves to achieve synchronous clamping. And a wiring assembly is arranged on part of the positioning clamps, comprises a transverse feeding module, a longitudinal feeding module and an electrode column, and is used for accurately butting a wiring terminal of the electric melting pipe fitting. The device has the characteristics of high-precision positioning, stable clamping, automatic wiring and the like, is suitable for welding straight-through, elbow, tee joint and other pipe fittings, can effectively improve the welding efficiency and quality, and is widely applied to municipal engineering, chemical engineering and gas pipeline engineering.

Description

Technical Field

[0001] This utility model relates to the field of electrofusion pipe fitting welding technology, specifically an electrofusion pipe fitting welding device. Background Technology

[0002] Electrofusion welding technology is widely used in municipal water supply and drainage, gas transmission, and chemical pipelines. It connects pipes and fittings through electrothermal fusion, offering advantages such as good sealing, high strength, and corrosion resistance. Traditional electrofusion welding processes typically rely on manual operation, resulting in low positioning accuracy, inconsistent weld quality, and low efficiency. Especially when welding different specifications or complex fittings (such as elbows, tees, and crosses), manual alignment is difficult, easily leading to welding defects and affecting the safety and service life of the pipeline system.

[0003] In the prior art, some automated welding equipment uses mechanical clamps to fix pipes and electrofusion fittings, and achieves fusion by electric heating. However, such equipment usually has the following shortcomings: (1) the clamp adjustment range is limited, making it difficult to adapt to various pipe diameters and fitting types; (2) the lack of a high-precision displacement control mechanism results in insufficient alignment accuracy between the pipe and the electrofusion fitting; (3) the clamping force is unstable, and it is easy to deviate due to vibration or thermal deformation during the welding process; (4) the electrode contact mechanism is not flexible enough, making it difficult to adapt to the wiring requirements of electrofusion fittings of different specifications. Utility Model Content

[0004] In view of the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide an electrofusion pipe fitting welding device that can achieve high-precision positioning, adaptive clamping, stable feeding and rapid wiring, so as to improve welding efficiency and quality.

[0005] The technical solution adopted by this utility model to achieve the above objectives is: an electrofusion pipe fitting welding device, including a mounting base, a guide groove, a threaded rod, and a displacement assembly. The guide groove is fixedly installed in the mounting base, the threaded rod is fixedly installed in the guide groove and arranged along the length direction of the guide groove, and the displacement assembly includes multiple sets slidably installed in the guide groove. The threaded rod and each set of displacement assemblies are linked together.

[0006] It also includes multiple sets of positioning fixtures that are assembled on each set of displacement components and kept coaxially distributed. Each positioning fixture includes a connecting bracket, a fixed plate, grippers, and a drive plate. The connecting bracket is fixedly installed on the displacement component, and the fixed plate is fixedly connected to the connecting bracket. The grippers include multiple sets arranged in a circular array. Each set of grippers is slidably installed on the fixed plate and slides radially along the fixed plate. The drive plate is rotatably installed in the fixed plate, and the drive plate has multiple sets of arc-shaped guide grooves arranged in a circular array. Pins are fixedly connected to the grippers, and the pins are matched with the arc-shaped guide grooves at corresponding positions.

[0007] It also includes a wiring assembly mounted on part of the positioning fixture. The wiring assembly includes a transverse feed module, a longitudinal feed module, and an electrode post. The longitudinal feed module is mounted on the movable end of the transverse feed module, and the electrode post is mounted on the movable end of the longitudinal feed module.

[0008] Based on the above technical solutions, in order to ensure that each group of displacement components can move independently under the guidance and association of the guide groove and the threaded rod, so as to complete the adjustment of the distance between two adjacent groups of displacement components, the following technical solution is provided.

[0009] The displacement assembly includes a sliding bracket, a drive motor, a rotary joint, and a matching combination of a worm gear A and a worm A. The sliding bracket is slidably installed in the guide groove, the connecting bracket is fixedly connected to the top of the sliding bracket, the rotary joint is concentrically fixed to the worm gear A and rotatably installed in the sliding bracket, the threaded rod is spun into the rotary joint, the drive motor is fixedly installed in the sliding bracket, and the worm A is rotatably installed in the sliding bracket and poweredly connected to the output shaft of the drive motor.

[0010] Based on the above technical solutions, in order to ensure that the fixed plate, grippers, and drive plate can be matched and combined, and to ensure the stable operation of each component, and to achieve synchronous extension and retraction of each set of grippers, thereby positioning the pipe or electrofusion fitting to the axis of the positioning fixture, the following technical solutions are provided.

[0011] The fixed disk has multiple sets of radial guide grooves arranged in a reversible array. The gripper is slidably installed in the radial guide grooves. An assembly outer cylinder is fixedly connected to the outer edge of the fixed disk. The connecting bracket is fixedly connected to the assembly outer cylinder. A positioning ring is fixedly connected in the assembly outer cylinder. The drive disk is rotatably installed between the positioning ring and the fixed disk. The positioning fixture also includes an assembly cover assembled on the assembly outer cylinder. An assembly inner cylinder that fits against the drive disk is fixedly connected to the axis of the assembly cover. Positioning through grooves A and B are respectively opened at the axis of the fixed disk and the drive disk. The radial guide grooves extend to the position of the positioning through groove A.

[0012] Based on the above technical solutions, in order to achieve effective control of the driving disk's operating posture while continuously providing a clamping force to the capacitor components or tubing, the following technical solution is provided.

[0013] The positioning fixture also includes a matching worm gear B and a worm B. The worm gear B is rotatably mounted on the outside of the assembly outer cylinder, and the worm B is rotatably mounted on the connecting bracket. A transmission bevel gear B is fixedly connected to the outer edge of the drive disk. The worm gear B is coaxially fixedly connected to the drive bevel gear B, which is arranged inside the assembly outer cylinder. The drive bevel gear B and the transmission bevel gear B are meshed. An operating knob is coaxially fixedly connected to the worm B.

[0014] Based on the above technical solutions, in order to ensure that the transverse feed module of the wiring assembly can be stably assembled and operated on the corresponding positioning fixture, the following technical solutions are provided.

[0015] A horizontally arranged guide bracket is fixedly connected to the connecting bracket in part of the positioning fixture. The transverse feed module includes a transverse slide and a transverse telescopic cylinder. The transverse slide is slidably installed in the guide bracket and slides in the horizontal direction. The transverse telescopic cylinder is fixedly installed on the connecting bracket, and the movable end of the transverse telescopic cylinder is fixedly connected to the transverse slide. The longitudinal feed module is assembled on the transverse slide.

[0016] Based on the above technical solutions, the following technical solutions are provided to ensure that the longitudinal feed module of the wiring assembly can be stably assembled and operated on the transverse slide.

[0017] The longitudinal feed module includes a longitudinal slide, a longitudinal guide rod, and a longitudinal telescopic cylinder. The longitudinal guide rod is fixedly connected to the bottom of the longitudinal slide and is slidably inserted into the transverse slide. The longitudinal telescopic cylinder is fixedly installed on the transverse slide, and the movable end of the longitudinal telescopic cylinder is fixedly connected to the longitudinal slide. The electrode post is fixedly installed on the longitudinal slide.

[0018] The beneficial effects of this utility model are:

[0019] 1. High-precision positioning and stable clamping: The displacement component driven by a worm gear and worm wheel, combined with a threaded rod and guide groove, enables independent and precise adjustment of multiple positioning fixtures. This ensures high-precision alignment between the electrofusion fitting and the pipe, avoiding welding deviation. The positioning fixture is also driven to extend and retract synchronously through worm gear and bevel gear transmission. It has a large and uniform clamping force and a self-locking function to prevent loosening due to vibration or thermal deformation during welding, thus ensuring clamping stability.

[0020] 2. Modular design, adaptable to various pipe fittings. The positioning clamp adopts a detachable connecting bracket design, which is convenient for changing or adjusting the clamping posture. It is suitable for welding different electrofusion pipe fittings such as straight, elbow, tee, and cross, improving the equipment's versatility. Multiple sets of displacement components are independently controlled, and the clamp spacing can be flexibly adjusted to adapt to the combination welding of different specifications of pipes and fittings, reducing manual adjustment time.

[0021] 3. Automated wiring improves welding efficiency. The wiring assembly, which integrates horizontal and vertical feed modules, can precisely control the displacement of the electrode post and automatically connect to the wiring terminals of the electrofusion fitting, reducing manual intervention, lowering the risk of wiring errors, and improving welding efficiency.

[0022] 4. The structure is stable and the operation is reliable. The mounting base and guide slide provide stable support to ensure that the equipment does not shake during the welding process. The worm gear transmission has a self-locking characteristic to prevent the displacement components from sliding accidentally when the machine stops, thus ensuring operational safety.

[0023] In summary, this device has significant advantages in improving welding precision, compatibility, automation, and stability. It can be widely used in pipeline welding projects in municipal, chemical, and gas industries, effectively improving construction efficiency and ensuring welding quality. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of this utility model after removing the mounting base;

[0026] Figure 3 A schematic diagram of the structure of the displacement component and the threaded rod assembly;

[0027] Figure 4 This is a schematic diagram of the positioning fixture and its internal structure.

[0028] Figure 5 This is a structural diagram of the positioning clamp tubular component in its disassembled state.

[0029] Figure 6 A schematic diagram of the wiring assembly being assembled on the positioning fixture;

[0030] Figure 7 This is a schematic diagram of the positioning component.

[0031] In the diagram: 1. Mounting base; 21. Guide groove; 22. Threaded rod; 3. Displacement assembly; 31. Sliding bracket; 32. Drive motor; 321. Drive bevel gear A; 33. Rotary joint; 34. Worm gear A; 35. Worm A; 351. Transmission bevel gear A; 4. Positioning fixture; 41. Connecting bracket; 411. Guide bracket; 42. Fixed plate; 421. Radial guide groove; 422. Assembly outer cylinder; 423. Positioning ring; 424. Positioning through groove A; 43. Clamp; 431. Pin. 44 Drive plate, 441 Arc-shaped guide groove, 442 Positioning through groove B, 443 Transmission bevel gear B, 45 Assembly cover, 451 Assembly inner cylinder, 46 Worm gear B, 461 Drive bevel gear B, 47 Worm B, 471 Operating knob, 5 Wiring assembly, 51 Lateral feed module, 511 Lateral slide, 512 Lateral telescopic cylinder, 52 Longitudinal feed module, 521 Longitudinal slide, 522 Longitudinal guide rod, 523 Longitudinal telescopic cylinder, 53 Electrode post. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0033] Please see Figure 1-7 An electrofusion pipe fitting welding device includes a mounting base 1, a guide groove 21, a threaded rod 22, and a displacement assembly 3. The guide groove 21 is fixedly installed in the mounting base 1, the threaded rod 22 is fixedly installed in the guide groove 21 and arranged along the length direction of the guide groove 21, and the displacement assembly 3 includes multiple sets that are slidably installed in the guide groove 21. The threaded rod 22 and each set of displacement assemblies 3 are linked together.

[0034] It also includes multiple sets of positioning fixtures 4, which are assembled on each set of displacement components 3 and kept coaxially distributed. Each positioning fixture 4 includes a connecting bracket 41, a fixed plate 42, a gripper 43, and a drive plate 44. The connecting bracket 41 is fixedly installed on the displacement component 3, the fixed plate 42 is fixedly connected to the connecting bracket 41, the gripper 43 includes multiple sets arranged in a ring array, each set of grippers 43 is slidably installed on the fixed plate 42 and slides along the radial direction of the fixed plate 42, the drive plate 44 is rotatably installed in the fixed plate 42, and the drive plate 44 has multiple sets of arc-shaped guide grooves 441 arranged in a ring array. A pin 431 is fixedly connected to the gripper 43, and the pin 431 is matched with the arc-shaped guide groove 441 at the corresponding position.

[0035] It also includes a wiring assembly 5 mounted on a partial positioning fixture 4. The wiring assembly 5 includes a transverse feed module 51, a longitudinal feed module 52, and an electrode post 53. The longitudinal feed module 52 is mounted on the movable end of the transverse feed module 51, and the electrode post 53 is mounted on the movable end of the longitudinal feed module 52.

[0036] Mounting base 1 ensures that guide slide 21, threaded rod 22 and other operating components are stably installed on it, and provides stable counterweight and support to ensure that the welding work of capacitor tubes is carried out stably.

[0037] Each set of displacement components 3 can drive the positioning clamps 4 mounted on it to run stably under the guidance of the guide groove 21, so as to adjust the spacing between each positioning clamp 4. The displacement components 3 and positioning clamps 4 are usually provided in four sets. The two sets of positioning clamps 4 on the outside are used to position the two sets of pipes to be welded, while the two sets of positioning clamps 4 in the middle are used to position the capacitor fittings spliced ​​with the two sets of pipes. Based on this, the wiring components 5 are mounted on the two sets of positioning clamps 4 in the middle to realize the electrofusion welding of the positioned electrofusion fittings.

[0038] This welding device is mainly used for positioning straight pipe fittings and welding corresponding pipe materials. It can also be used for welding common electrofusion pipe fittings such as elbows, tees, and crosses. During welding, by changing the clamping posture of elbows, tees, and crosses, the interfaces at other angles can be aligned with the pipes to be welded.

[0039] The spacing between the two sets of positioning clamps 4 in the middle is adjusted by the corresponding displacement component 3 to achieve effective positioning of specific electrofusion fittings. The corresponding wiring component 5 is driven to connect the electrode post 53 to the wiring head on the electrofusion fitting. Then, the pipe to be welded is fixed to the corresponding set of outer positioning clamps 4. The displacement component 3 drives the positioning clamps 4 and the pipe to move towards the electrofusion fitting. After the power is turned on, the interface of the electrofusion fitting can be uniformly heated to achieve the welding combination of the pipe and the capacitor cabinet fitting.

[0040] To ensure that each group of displacement components 3 can move independently under the guidance and association of the guide groove 21 and the threaded rod 22, so as to complete the adjustment of the distance between two adjacent groups of displacement components 3, the following technical solution is provided.

[0041] The displacement assembly 3 includes a sliding bracket 31, a drive motor 32, a swivel joint 33, and a matching combination of a worm gear A34 and a worm A35. The sliding bracket 31 is slidably installed in the guide groove 21, and the connecting bracket 41 is fixedly connected to the top of the sliding bracket 31. The swivel joint 33 is concentrically fixed to the worm gear A34 and rotatably installed in the sliding bracket 31. The threaded rod 22 is swivelly connected to the swivel joint 33. The drive motor 32 is fixedly installed in the sliding bracket 31, and the worm A35 is rotatably installed in the sliding bracket 31 and poweredly connected to the output shaft of the drive motor 32.

[0042] The sliding bracket 31 can slide stably in the guide groove 21 and ensure that the drive motor 32, the rotating seat 33, the worm gear A34 and the worm A35 are stably assembled therein. The connecting bracket 41 in the positioning fixture 4 can be assembled to the sliding bracket 31 by bolt fixing, which facilitates the disassembly, maintenance and replacement of the modularly designed positioning fixture 4.

[0043] A drive bevel gear A321 is fixedly connected to the output shaft of the drive motor 32, while a transmission bevel gear A351 is coaxially fixed to the worm gear A35. The drive bevel gear A321 and the transmission bevel gear A351 are meshed. When the drive motor 32A is running, the combination of the drive bevel gear A321 and the transmission bevel gear A351 drives the worm gear A35 to run stably, which in turn drives the worm wheel A34 and the rotating seat 33 to run stably. Then, through the cooperation between the rotating seat 33 and the threaded rod 22, the displacement assembly 3 moves as a whole.

[0044] Since the combination of worm gear A34 and worm A35 has the characteristics of speed reduction and torque increase and one-way self-locking, it can effectively increase the displacement accuracy and feed power of displacement component 3. Furthermore, when the drive motor 32 is stopped, worm gear A34 is locked due to the restriction of worm A35, thereby ensuring that the entire displacement component 3 is in a locked state.

[0045] To ensure that the fixed plate 42, gripper 43, and drive plate 44 can be matched and combined, and to ensure the stable operation of each component, and to achieve synchronous extension and retraction of each set of grippers 43, thereby positioning the pipe or electrofusion fitting to the axis of the positioning fixture 4, the following technical solution is provided.

[0046] The fixed disk 42 has multiple sets of radial guide grooves 421 arranged in a reversible array. The gripper 43 is slidably installed in the radial guide grooves 421. An assembly outer cylinder 422 is fixedly connected to the outer edge of the fixed disk 42. The connecting bracket 41 is fixedly connected to the assembly outer cylinder 422. A positioning ring 423 is fixedly connected in the assembly outer cylinder 422. The drive disk 44 is rotatably installed between the positioning ring 423 and the fixed disk 42. The positioning fixture 4 also includes an assembly cover 45 assembled on the assembly outer cylinder 422. An assembly inner cylinder 451 that fits against the drive disk 44 is fixedly connected at the axis of the assembly cover 45. Positioning through grooves A424 and B442 are respectively opened at the axis of the fixed disk 42 and the drive disk 44. The radial guide grooves 421 extend to the position of the positioning through groove A424.

[0047] The radial guide groove 421 ensures that the gripper 43 slides stably along the radial direction of the fixed disk 42. The outer cylinder 422 and the positioning ring 423 ensure that the drive disk 44 is assembled onto the fixed disk 42 and operates in a relatively rotating posture. The assembly cover 45 further improves the stability of the assembly and operation of the drive disk 44.

[0048] The inner cylinder 451, positioning through groove A424, and positioning through groove B442 are kept in a connected state, which ensures that the capacitor fittings or pipes to be clamped are arranged in them and are effectively fixed by each gripper 43 moving towards the axis.

[0049] To achieve effective control over the operating posture of the drive disk 44, while continuously providing a constant clamping force to the capacitor components or tubing, the following technical solution is provided.

[0050] The positioning fixture 4 also includes a matching worm gear B46 and worm B47. The worm gear B46 is rotatably mounted on the outside of the assembly outer cylinder 422, and the worm B47 is rotatably mounted on the connecting bracket 41. The outer edge of the drive disk 44 is fixedly connected to the transmission bevel gear B443. The worm gear B46 is coaxially fixedly connected to the drive bevel gear B461, which is arranged inside the assembly outer cylinder 422. The drive bevel gear B461 and the transmission bevel gear B443 are meshed. The worm B47 is coaxially fixedly connected to the operating knob 471.

[0051] When the operating knob 471 is turned, it can drive the worm gear B47 to rotate synchronously, thereby driving the worm wheel B46 and the bevel gear B461 to rotate stably, thereby driving the transmission bevel gear B443 and the drive disk 44 to rotate stably, and then controlling the extension and retraction posture of each set of grippers 43 synchronously through the arc-shaped guide groove 441 provided on the drive disk 44.

[0052] Since the worm gear B46 and worm B47 also have the characteristics of speed reduction and torque amplification and one-way self-locking, when the positioning clamp 4 is running, the force can be amplified through the combination of worm B47 and worm gear B46, and the combination of drive bevel gear B461 and transmission bevel gear B443, so that the clamp 43 can effectively clamp the outer wall of the electrofusion fitting or pipe.

[0053] When the worm B47 is stationary, the worm wheel B46 is locked due to the limiting effect of the worm B47, thus ensuring that each set of jaws 43 is also locked, so that it continuously clamps the capacitor tube or tube.

[0054] To ensure that the transverse feed module 51 of the wiring assembly 5 can be stably assembled and operated on the corresponding positioning fixture 4, the following technical solution is provided.

[0055] A horizontally arranged guide bracket 411 is fixedly connected to the connecting bracket 41 in the partial positioning fixture 4. The transverse feed module 51 includes a transverse slide 511 and a transverse telescopic cylinder 512. The transverse slide 511 is slidably installed in the guide bracket 411 and slides in the horizontal direction. The transverse telescopic cylinder 512 is fixedly installed on the connecting bracket 41, and the movable end of the transverse telescopic cylinder 512 is fixedly connected to the transverse slide 511. The longitudinal feed module 52 is assembled on the transverse slide 511.

[0056] The guide bracket 411 ensures that the transverse slide 511 slides stably in the horizontal direction. During the control of the extension and retraction of the transverse telescopic cylinder 512, it can drive the transverse slide 511 and the longitudinal feed assembly mounted on it to run stably in the horizontal direction, thereby adjusting the horizontal coordinate of the electrode post 53.

[0057] To ensure that the longitudinal feed module 52 of the wiring assembly 5 can be stably assembled and operated on the transverse slide 511, the following technical solution is provided.

[0058] The longitudinal feed module 52 includes a longitudinal slide 521, a longitudinal guide rod 522, and a longitudinal telescopic cylinder 523. The longitudinal guide rod 522 is fixedly connected to the bottom of the longitudinal slide 521. The longitudinal guide rod 522 is slidably inserted into the transverse slide 511. The longitudinal telescopic cylinder 523 is fixedly installed on the transverse slide 511, and the movable end of the longitudinal telescopic cylinder 523 is fixedly connected to the longitudinal slide 521. The electrode post 53 is fixedly installed on the longitudinal slide 521.

[0059] The longitudinal guide rod 522 ensures that the longitudinal slide 521 moves stably up and down in the vertical direction. During the process of controlling the extension and retraction of the longitudinal telescopic cylinder 523, it can drive the longitudinal slide 521 and the electrode column 53 on it to move up and down synchronously, so as to adjust the vertical coordinate of the electrode column 53.

[0060] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electrically fused pipe joint welding apparatus characterized by: The utility model relates to a kind of displacement assembly, including installation base (1), guide chute (21), threaded rod (22), displacement component (3), the guide chute (21) is fixedly installed in the installation base (1), the threaded rod (22) is fixedly installed into the guide chute (21) and is arranged along the length direction of guide chute (21), the displacement component (3) includes multiple groups, the threaded rod (22) and each group displacement component (3) are kept linkage; Still including multiple groups of positioning clamp (4) on each group displacement component (3) respectively assembled and kept coaxial distribution, the positioning clamp (4) includes connecting bracket (41), fixed disc (42), jaw (43), driving disc (44), the connecting bracket (41) is fixedly installed on the displacement component (3), the fixed disc (42) is fixedly connected to the connecting bracket (41), the jaw (43) includes multiple groups of annular array distribution, each group jaw (43) is slidably installed to the fixed disc (42) and slides along the radial direction of fixed disc (42), the driving disc (44) is rotatably installed to the fixed disc (42), and multiple groups of annular array distribution are arranged on the driving disc (44) The arc-shaped guide slot (441) is opened, the pin shaft (431) is fixedly connected to the jaw (43), and the pin shaft (431) is matched with the arc-shaped guide slot (441) at corresponding position Combination; Still including wiring assembly (5) assembled to part of the positioning clamp (4), the wiring assembly (5) includes transverse feed module (51), longitudinal feed module (52), electrode column (53), the longitudinal feed module (52) is assembled to the movable end of transverse feed module (51), and the electrode column (53) is assembled to the movable end of the longitudinal feed module (52).

2. An electrically fused pipe joint welding apparatus as defined in claim 1 wherein: The displacement component (3) includes sliding bracket (31), drive motor (32), screw seat (33) and matched combination worm gear A (34), worm A (35), the sliding bracket (31) is slidably installed into the guide chute (21), the connecting bracket (41) is fixedly connected to the top of sliding bracket (31), the screw seat (33) is concentrically fixedly connected with worm gear A (34) and rotatably installed into the sliding bracket (31), the threaded rod (22) is screwed with screw seat (33), the drive motor (32) is fixedly installed into the sliding bracket (31), the worm A (35) is rotatably installed into sliding bracket (31) and is power connected with the output shaft of the drive motor (32).

3. An electrically fused pipe joint welding apparatus as defined in claim 1 wherein: A plurality of radial guide grooves (421) in a commutating array are formed on the fixing disc (42), the clamping jaw (43) is slidingly installed in the radial guide groove (421), an assembly outer cylinder (422) is fixedly connected to the outer edge of the fixing disc (42), the connecting bracket (41) is fixedly connected with the assembly outer cylinder (422), a positioning ring (423) is fixedly connected in the assembly outer cylinder (422), the driving disc (44) is rotatably installed between the positioning ring (423) and the fixing disc (42), the positioning clamp (4) further comprises an assembly cover (45) assembled on the assembly outer cylinder (422), an assembly inner cylinder (451) is fixedly connected to the shaft center of the assembly cover (45) and abuts against the driving disc (44), positioning through grooves A (424) and B (442) are respectively formed at the shaft centers of the fixing disc (42) and the driving disc (44), and the radial guide groove (421) extends to the position where the positioning through groove A (424) is located.

4. An electrically fused pipe joint welding apparatus as defined in claim 3 wherein: The positioning clamp (4) further comprises a worm wheel B (46) and a worm B (47) which are combined, the worm wheel B (46) is rotatably installed on the outer side of the assembly outer cylinder (422), the worm B (47) is rotatably installed on the connecting bracket (41), a transmission bevel gear B (443) is fixedly connected to the outer edge of the driving disc (44), a driving bevel gear B (461) is coaxially fixedly connected to the inner side of the assembly outer cylinder (422), the driving bevel gear B (461) is in engagement with the transmission bevel gear B (443), and the worm B (47) is coaxially fixedly connected with an operation knob (471).

5. An electrically fused pipe joint welding apparatus as defined in claim 1 wherein: A guide bracket (411) is fixedly connected to the connecting bracket (41) in the positioning clamp (4), the guide bracket (411) is horizontally arranged, the transverse feeding module (51) comprises a transverse sliding seat (511) and a transverse telescopic cylinder (512), the transverse sliding seat (511) is slidingly installed in the guide bracket (411) and slides in the horizontal direction, the transverse telescopic cylinder (512) is fixedly installed on the connecting bracket (41), and the movable end of the transverse telescopic cylinder (512) is fixedly connected with the transverse sliding seat (511), and the longitudinal feeding module (52) is assembled on the transverse sliding seat (511).

6. An electrically fused pipe joint welding apparatus as defined in claim 5 wherein: The longitudinal feeding module (52) comprises a longitudinal sliding seat (521), a longitudinal guide rod (522) and a longitudinal telescopic cylinder (523), the longitudinal guide rod (522) is fixedly connected to the bottom of the longitudinal sliding seat (521), the longitudinal guide rod (522) is slidingly inserted into the transverse sliding seat (511), the longitudinal telescopic cylinder (523) is fixedly installed on the transverse sliding seat (511), and the movable end of the longitudinal telescopic cylinder (523) is fixedly connected with the longitudinal sliding seat (521), and the electrode column (53) is fixedly installed on the longitudinal sliding seat (521).

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