Welding device capable of effectively positioning and used for PVC pipe production

By adjusting and clamping the components, the problem of unstable fixing during PVC pipe welding was solved, achieving stable clamping and accurate welding of PVC pipes and improving welding quality.

CN223877567UActive Publication Date: 2026-02-06HANGZHOU HONGSHUN PIPES IND CO LTD
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Patent Information

Application Number
CN202520522840.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-24
Publication Date
2026-02-06
Estimated Expiration
2035-03-24

AI Technical Summary

Technical Problem

During the welding process of PVC pipes, existing equipment is unable to effectively fix the pipes, leading to welding failure.

Method used

The system employs an adjustment assembly and a clamping assembly, using the cooperation of a threaded rod and a slider to achieve stable clamping of the PVC pipe. It also utilizes a pressure seat and a flexible pad to limit the pipe end, ensuring that the pipe does not shift during the welding process.

Benefits of technology

It improves the strength and accuracy of PVC pipe welding, avoiding quality problems such as pipe misalignment and bending of weld joints during the welding process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of pipe welding, in particular to a welding device capable of effectively positioning for PVC pipe production, which comprises a workbench, cavities are symmetrically arranged in the workbench, limit sliding grooves are symmetrically arranged at the top of the workbench, sliders are slidably connected in the limit sliding grooves, and the sliders are arranged in the cavities. And a supporting column is installed at the top of the sliding block, a clamping assembly is installed at the top of the supporting column and used for clamping and fixing the PVC pipe, and an adjusting assembly is arranged on the side wall of the workbench and used for adjusting the position of the clamping assembly. According to the welding device for PVC pipe production, the clamping assembly can be moved according to actual requirements through the adjusting assembly, so that the welding device for PVC pipe production can stably clamp the middles of PVC pipes with different lengths according to specific requirements, the pipes are firmly fixed, deviation of the PVC pipes in the welding process is avoided, and the firmness of the pipes is greatly improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to pipe material welding technical field, concretely is a kind of welding device for PVC pipe production with effective positioning. BACKGROUND

[0002] PVC pipe is by polyvinyl chloride resin and stabilizer, lubricant etc. after cooperation with hot-pressing extrusion molding, it is the earliest development and application plastic pipe material;In the production process of PVC pipe, the welding process of PVC pipe is completed using the principle of hot melt welding, hot melt welding is a kind of welding mode using exothermic flux chemical reaction as heat source, generates high temperature and reaches the purpose of welding through melting mold, it is also the common welding mode of PVC pipe.

[0003] In the welding process of PVC pipe, some problems will inevitably occur, therefore, positioning PVC pipe butt joint is crucial in the process of PVC pipe welding production;When PVC pipe material is welded by artificial or mechanical positioning in general welding device during production and processing, it is prone to cause welding failure due to the insecure fixation of pipe material. INVENTION CONTENTS

[0004] One purpose of the present application is to provide a kind of welding device for PVC pipe production with effective positioning, which can effectively solve the problems in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of welding device for PVC pipe production with effective positioning, including workbench, the inside symmetry of workbench is provided with cavity, the top of workbench is symmetrically provided with limit sliding slot, the inside sliding connection of limit sliding slot is provided with sliding block, the top of sliding block is installed with support column, the top of support column is installed with clamping assembly, and clamping assembly is used to clamp fixed PVC pipe, the side wall of workbench is provided with adjusting assembly, and adjusting assembly is used to adjust the position of clamping assembly;

[0006] The adjusting assembly includes a first threaded rod and a handle, the side wall of the workbench is provided with a first threaded rod, and one end of the first threaded rod is movably connected with the inner wall of the cavity of the workbench, the limit sliding slot is in communication with the cavity, the sliding block is connected with the first threaded rod by screw thread, and the upper end outer surface of the sliding block is slidingly connected with the wall surface of the limit sliding slot, the other end of the first threaded rod is provided with a handle.

[0007] Preferably, the clamping assembly includes a support platform, a vertical plate, a first electric telescopic rod and a clamping arc-shaped plate, the top of the support column is provided with a support platform, the top of the support platform is symmetrically provided with a vertical plate at the front end and the rear end, a first electric telescopic rod is installed on the opposite inner side wall surface of the two groups of vertical plates, and one end of the first electric telescopic rod is provided with a clamping arc-shaped plate.

[0008] Preferably, the inner side surface of the clamping arc-shaped plate is provided with a non-slip pad.

[0009] Preferably, the top left end and the top right end of the workbench are symmetrically provided with side plates, one side wall surface of each side plate is provided with a second threaded rod penetratingly installed, one end of the second threaded rod is movably connected with a pressing seat, and one side wall surface of the side plate is movably provided with a limiting rod penetratingly installed, and one end of the limiting rod is connected with the pressing seat.

[0010] Preferably, one side of the pressing seat is provided with a groove, and the wall surface of the groove of the pressing seat is provided with a flexible pad.

[0011] Preferably, the top center of the workbench is provided with a welding operation table, the welding operation table comprises a bottom plate, vertical rods symmetrically installed at four ends of the top of the bottom plate, and a top plate installed at the top of the vertical column, the bottom plate and the top plate of the welding operation table are symmetrically provided with second electric telescopic rods on opposite inner sides, and the output end of the second electric telescopic rod is provided with a hot melt device.

[0012] Preferably, the top of the workbench is symmetrically provided with columns, and the columns are located on both sides of the welding operation table, and the top of the column is provided with an auxiliary positioning seat.

[0013] Preferably, the top of the auxiliary positioning seat is provided with a movable rod penetratingly installed, the top of the movable rod is provided with a top disc, the top of the auxiliary positioning seat is provided with an auxiliary biasing spring, and the auxiliary biasing spring is located on the outer side of the movable rod, one end of the auxiliary biasing spring is connected with the bottom of the top disc, the bottom of the movable rod is provided with an auxiliary pressing strip, and the auxiliary pressing strip is located in the interior of the auxiliary positioning seat.

[0014] Compared with the prior art, the welding device for PVC pipe production has the advantages that:

[0015] In the utility model, the clamping assembly can be moved according to actual demands through the adjusting assembly, so that the welding device for PVC pipe production can stably clamp the middle part of PVC pipes with different lengths according to specific demands, the pipe material is firmly fixed, deviation of the PVC pipe in the welding process is avoided, and the firmness of the pipe material is greatly improved.

[0016] 2、In the utility model, the pressing seat can press the end of the PVC pipe which does not need to be welded, so as to limit the end of the PVC pipe, and the pressing seat can also drive the left and right PVC pipes to approach each other through the rotation of the second threaded rod to complete the welding work, the pressing seat can limit the end of the PVC pipe, avoid the sliding of the PVC pipe in the clamping assembly and deviation, and ensure that the left and right PVC pipes move in the same horizontal line position, so that the accuracy of the butt joint of the PVC welding joint is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the utility model.

[0018] Figure 2 It is the support platform side sectional view structural drawing of the utility model;

[0019] Figure 3 It is the auxiliary positioning seat structure schematic view of the utility model;

[0020] Figure 4 It is the welding operation platform structure schematic view of the utility model.

[0021] In the figure: 1, workbench;2, first threaded rod;3, sliding block;4, limit sliding slot;5, support column;6, support platform;7, handle;8, side plate;9, first electric telescopic rod;10, clamping arc plate;11, non-slip mat;12, vertical plate;13, second threaded rod;14, limit rod;15, pressing seat;16, groove;17, flexible pad;18, stand column;19, auxiliary positioning seat;20, movable rod;21, auxiliary pressing strip;22, top disc;23, auxiliary tension spring;24, welding operation platform;25, second electric telescopic rod;26, hot melt machine. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0023] In the description of the utility model, it should be explained that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the terms "mount", "be provided with", "connect" and the like should be understood broadly, for example, "connect", can be fixed connection, also can be detachable connection, or integrally connect;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be the communication inside two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0025] The following combines the attached Figures 1-4 The technical scheme of the utility model is further explained as follows:

[0026] Embodiment one: as Figure 1 And Figure 2As shown, a PVC pipe production welding device that can be effectively positioned, including a workbench 1, the inside of the workbench 1 is symmetrically provided with a cavity, the top of the workbench 1 is symmetrically provided with a limiting sliding groove 4, the inside of the limiting sliding groove 4 is slidably connected with a sliding block 3, the top of the sliding block 3 is installed with a support column 5, the top of the support column 5 is installed with a clamping assembly, and the clamping assembly is used for clamping and fixing the PVC pipe, the side wall of the workbench 1 is provided with an adjusting assembly, and the adjusting assembly is used for adjusting the position of the clamping assembly, the adjusting assembly includes a first threaded rod 2 and a handle 7, the first threaded rod 2 is installed through the side wall of the workbench 1, and one end of the first threaded rod 2 is movably connected with the inner wall of the cavity of the workbench 1, the limiting sliding groove 4 is communicated with the cavity, the sliding block 3 is connected with the first threaded rod 2 through threads, and the upper end of the sliding block 3 is slidably connected with the wall surface of the limiting sliding groove 4, the other end of the first threaded rod 2 is installed with the handle 7, the clamping assembly includes a support platform 6, a vertical plate 12, a first electric telescopic rod 9 and a clamping arc plate 10, the top of the support column 5 is installed with the support platform 6, the top of the support platform 6 is symmetrically installed with the vertical plate 12 at the front end and the rear end, the opposite inner side walls of the two groups of vertical plates 12 are installed with the first electric telescopic rod 9, one end of the first electric telescopic rod 9 is installed with the clamping arc plate 10, and the inner side surface of the clamping arc plate 10 is installed with a non-slip pad 11; the workbench 1 provides a set position for the cavity and the limiting sliding groove 4, the limiting sliding groove 4 provides a sliding space for the sliding block 3, and the movement of the sliding block 3 is limited through the sliding action between the limiting sliding groove 4 and the sliding block 3, so as to avoid the rotation of the sliding block 3 with the first threaded rod 2, the sliding block 3 provides an installation position for the support column 5, the support column 5 provides an installation position for the clamping assembly, the workbench 1 provides an installation position for the adjusting assembly, the workbench 1 provides an installation position for the first threaded rod 2, the first threaded rod 2 provides an installation position for the handle 7, the handle 7 is convenient for rotating the first threaded rod 2, the first threaded rod 2 is connected with the sliding block 3 through threads, and the sliding block 3 is limited by the limiting sliding groove 4, so that the rotation of the first threaded rod 2 can make the sliding block 3 slide in the limiting sliding groove 4; the support column 5 provides an installation position for the support platform 6, the support platform 6 provides an installation position for the vertical plate 12, the vertical plate 12 provides an installation position for the first electric telescopic rod 9, the first electric telescopic rod 9 provides an installation position for the clamping arc plate 10, the clamping arc plate 10 provides an installation position for the non-slip pad 11, and the non-slip pad 11 can increase the friction between the clamping arc plate 10 and the PVC pipe, so that the clamping arc plate 10 can stably clamp the PVC pipe;In use, the welding device for PVC pipe production is first positioned, and the PVC pipe is positioned by other components. Then, the first threaded rod 2 is rotated by rotating the handle 7, and the rotation of the first threaded rod 2 drives the sliding block 3 to slide in the limiting sliding groove 4. The sliding block 3 slides in the limiting sliding groove 4, driving the supporting column 5 and the clamping assembly to slide together until the clamping assembly is moved to the middle of the PVC pipe to be welded, and the clamping assembly clamps and fixes the PVC pipe. After the clamping assembly is moved to the middle of the PVC pipe, the output end of the first electric telescopic rod 9 on the vertical plate 12 is telescoped, driving the clamping arc-shaped plate 10 to clamp the PVC pipe, so that the PVC pipe is clamped stably. Through the movable clamping assembly, the welding device for PVC pipe production can stably clamp the middle of PVC pipes of different lengths according to specific needs, so that the pipe is firmly fixed and does not shake during butt joint, avoiding the offset of the PVC pipe during welding, and the bending of the welding interface position and other quality problems.

[0027] Example 2: as Figure 1As shown, the top left end and the right end of the workbench 1 are symmetrically provided with side plates 8, one side wall surface of the side plate 8 is provided with a second threaded rod 13 penetratingly installed, one end of the second threaded rod 13 is movably connected with a pressing seat 15, one side wall surface of the side plate 8 is movably provided with a limiting rod 14 penetratingly installed, and one end of the limiting rod 14 is connected with the pressing seat 15, one side of the pressing seat 15 is provided with a groove 16, and the wall surface of the groove 16 of the pressing seat 15 is provided with a flexible pad 17, the workbench 1 provides an installation position for the side plate 8, the side plate 8 provides an installation position for the second threaded rod 13, the second threaded rod 13 provides an installation position for the pressing seat 15, and the side plate 8 provides an installation position for the limiting rod 14, the limiting rod 14 is connected with the pressing seat 15, so as to limit the movement of the pressing seat 15, and the pressing seat 15 cannot rotate with the rotation of the second threaded rod 13, the pressing seat 15 provides an opening position for the groove 16, and the groove 16 provides an installation position for the flexible pad 17, the flexible pad 17 avoids the direct contact between the hard surface of the pressing seat 15 and the PVC pipe, and prevents the end of the PVC pipe from being abraded or damaged; after the PVC pipe is clamped and fixed by the clamping assembly, the staff can rotate the second threaded rod 13, so that the pressing seat 15 approaches the end of the PVC pipe which does not need to be welded under the limiting action of the limiting rod 14, until the end of the PVC pipe which does not need to be welded enters the internal groove 16 of the pressing seat 15, and the pressing seat 15 presses the end of the PVC pipe which does not need to be welded through the flexible pad 17, under the pressing action of the pressing seat 15 on the PVC pipe and the clamping and fixing action of the clamping assembly on the PVC pipe, the PVC pipe is further stabilized, and the PVC pipe can be prevented from sliding and deviating in the clamping assembly under the action of external force; the staff can also rotate the second threaded rod 13 to make the pressing seat 15 push the PVC pipe to move towards the vertical central axis of the workbench 1 after the welding position of the PVC pipe is heated, so that the two PVC pipes on the workbench 1 are welded.

[0028] Example three: as Figure 1 , Figure 3 and Figure 4As shown, the top center of the workbench 1 is provided with a welding operation table 24, which comprises a bottom plate, vertical rods symmetrically installed at the four ends of the top of the bottom plate, and a top plate installed at the top of the vertical column. The opposite inner sides of the bottom plate and the top plate of the welding operation table 24 are symmetrically provided with second electric telescopic rods 25, the output ends of the second electric telescopic rods 25 are provided with hot melters 26, the top of the workbench 1 is symmetrically provided with vertical columns 18, and the vertical columns 18 are located on both sides of the welding operation table 24. The top of the vertical column 18 is provided with an auxiliary positioning seat 19, the top of the auxiliary positioning seat 19 is provided with a movable rod 20, the top of the movable rod 20 is provided with a top disc 22, the top of the auxiliary positioning seat 19 is provided with an auxiliary force spring 23, and the auxiliary force spring 23 is located on the outer side of the movable rod 20. One end of the auxiliary force spring 23 is connected with the bottom of the top disc 22, the bottom of the movable rod 20 is provided with an auxiliary pressing strip 21, and the auxiliary pressing strip 21 is located in the inside of the auxiliary positioning seat 19. The workbench 1 provides an installation position for the welding operation table 24, the welding operation table 24 provides an installation position for the second electric telescopic rod 25, and the second electric telescopic rod 25 provides an installation position for the hot melter 26. The hot melter 26 is used for softening the welding end of the PVC pipe, and the cross section of the hot melter 26 is in the shape of a semicircular ring. The second electric telescopic rod 25 and the hot melter 26 are symmetrically installed about the horizontal central axis of the welding operation table 24. The workbench 1 provides an installation position for the vertical column 18, the vertical column 18 provides an installation position for the auxiliary positioning seat 19, the auxiliary positioning seat 19 provides an installation position for the movable rod 20, the movable rod 20 provides an installation position for the top disc 22 and the auxiliary pressing strip 21, the inner side of the auxiliary pressing strip 21 conforms to the arc shape of the PVC pipe, the auxiliary positioning seat 19 provides an installation position for the auxiliary force spring 23, and the auxiliary force spring 23 connects the top of the auxiliary positioning seat 19 with the bottom of the top disc 22. The auxiliary force spring 23 transmits force to the auxiliary pressing strip 21 through the top disc 22 and the movable rod 20, so that the auxiliary pressing strip 21 can press the PVC pipe. When the PVC pipe is placed on the workbench 1, the top disc 22 is first pulled upward, the auxiliary force spring 23 is compressed, the PVC pipe passes through the inside of the auxiliary positioning seat 19, and the welding end of the PVC pipe is positioned in the middle of the welding operation table 24. Then the top disc 22 is released, the auxiliary force spring 23 reduces the compression amount on the basis of the original compression amount by relying on the elastic restoring force, and the top disc 22 and the movable rod 20 make the auxiliary pressing strip 21 press the PVC pipe through the elastic restoring force of the auxiliary force spring 23, so as to assist in positioning the part of the PVC pipe close to the welding position, thereby ensuring the accuracy of the welding joint. After the PVC pipe is fixed, the second electric telescopic rod 25 in the welding operation table 24 drives the hot melter 26 to move close to the pipe, so that the hot melter 26 heats the welding part of the PVC pipe. After heating, the output end of the second electric telescopic rod 25 is retracted. At this time, the left PVC pipe can be moved to the right and the right PVC pipe can be moved to the left through the pressing seat 15, so that the left and right PVC pipes are welded.

[0029] Working principle: Before using the PVC pipe production welding device, it should be checked whether the PVC pipe production welding device has any problems that affect the use. First, place the PVC pipe production welding device in the position where it is needed. First, pull the top disc 22 upwards, so that the PVC pipe passes through the inside of the auxiliary positioning seat 19, and the welding position of the PVC pipe is in the middle of the welding operation table 24. At this time, loosen the top disc 22, and the auxiliary force spring 23 reduces the compression amount based on the original compression amount due to the elastic recovery force. The top disc 22 and the movable rod 20 press the auxiliary pressing strip 21 against the PVC pipe through the elastic recovery force of the auxiliary force spring 23, thereby assisting in positioning the part of the PVC pipe close to the welding position.

[0030] Then the staff rotates the handle 7 to drive the first threaded rod 2 to rotate, so that the sliding block 3 slides in the limiting sliding groove 4, driving the supporting column 5 and the clamping assembly to slide together until the clamping assembly moves to the middle of the PVC pipe that needs to be welded. The clamping assembly clamps and fixes the PVC pipe. Through the movable clamping assembly, the PVC pipe production welding device can stably clamp the middle part of PVC pipes of different lengths according to specific needs, so that the pipe is firmly fixed and will not shake during butt joint, avoiding the offset of the PVC pipe during welding, which can cause bending and other quality problems of the welded joint position.

[0031] After the PVC pipe is fixed and clamped by the clamping assembly, the staff can rotate the second threaded rod 13 to make the pressing seat 15 approach the end of the PVC pipe that does not need to be welded under the limiting action of the limiting rod 14, until the end of the PVC pipe that does not need to be welded enters the internal groove 16 of the pressing seat 15, and the pressing seat 15 presses the end of the PVC pipe that does not need to be welded through the flexible pad 17. The pressing action of the pressing seat 15 on the PVC pipe and the clamping and fixing action of the clamping assembly on the PVC pipe further stabilize the PVC pipe.

[0032] After the PVC pipe is fixed, the second electric telescopic rod 25 in the welding operation table 24 drives the hot melt device 26 to approach the pipe, so that the hot melt device 26 heats the welding position of the PVC pipe. After heating, the output end of the second electric telescopic rod 25 retracts. At this time, the second threaded rod 13 can be rotated to make the pressing seat 15 push the left PVC pipe to the right, and the right PVC pipe to the left, so that the left and right PVC pipes are welded.

[0033] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, no reference signs in the claims being regarded as limiting the claims concerned.

Claims

1. An effectively positionable welding device for PVC pipe production, comprising a workbench (1), characterized in that: The inside of the workbench (1) is symmetrically provided with a cavity, the top of the workbench (1) is symmetrically provided with a limiting sliding groove (4), the inside of the limiting sliding groove (4) is slidably connected with a sliding block (3), the top of the sliding block (3) is provided with a supporting column (5), the supporting column (5) is provided with a clamping assembly, and the clamping assembly is used for clamping a PVC pipe, and the side wall of the workbench (1) is provided with an adjusting assembly, and the adjusting assembly is used for adjusting the position of the clamping assembly. The adjusting assembly comprises a first threaded rod (2) and a handle (7), the side wall of the workbench (1) is provided with a first threaded rod (2), and one end of the first threaded rod (2) is movably connected with the inner wall of the cavity of the workbench (1), the limiting sliding groove (4) is communicated with the cavity, the sliding block (3) is connected with the first threaded rod (2) through threads, and the upper end of the sliding block (3) is slidably connected with the wall surface of the limiting sliding groove (4), and the other end of the first threaded rod (2) is provided with a handle (7). The clamping assembly comprises a supporting platform (6), a vertical plate (12), a first electric telescopic rod (9) and a clamping arc-shaped plate (10), the top of the supporting column (5) is provided with a supporting platform (6), the top of the supporting platform (6) is provided with a vertical plate (12) symmetrically arranged at the front end and the rear end, a first electric telescopic rod (9) is arranged on the opposite inner side walls of the two vertical plates (12), and one end of the first electric telescopic rod (9) is provided with a clamping arc-shaped plate (10). The top center of the workbench (1) is provided with a welding operation table (24), the welding operation table (24) comprises a bottom plate, vertical rods symmetrically arranged at four ends of the top of the bottom plate and a top plate arranged at the top of the vertical column, second electric telescopic rods (25) are symmetrically arranged on the opposite inner sides of the bottom plate and the top plate of the welding operation table (24), and a hot melting device (26) is arranged at the output end of the second electric telescopic rod (25).

2. A positionable welding device for PVC pipe production as claimed in claim 1, characterized in that: The inner side surface of the clamping arc-shaped plate (10) is provided with a non-slip pad (11).

3. A device for welding PVC pipes as claimed in claim 1, wherein: The top left end and the top right end of the workbench (1) are symmetrically provided with side plates (8), one side wall surface of the side plate (8) is provided with a second threaded rod (13), one end of the second threaded rod (13) is movably connected with a pressing seat (15), and a limiting rod (14) is movably arranged on one side wall surface of the side plate (8), and one end of the limiting rod (14) is connected with the pressing seat (15).

4. A positionable PVC pipe welding device as claimed in claim 3, wherein: One side of the pressing seat (15) is provided with a groove (16), and the wall surface of the groove (16) of the pressing seat (15) is provided with a flexible pad (17).

5. A positionable PVC pipe welding device as claimed in claim 1, wherein: The top of the workbench (1) is symmetrically provided with vertical columns (18), and the vertical columns (18) are located on both sides of the welding operation table (24), and the top of the vertical column (18) is provided with an auxiliary positioning seat (19).

6. A positionable PVC pipe welding device as claimed in claim 5, wherein: The top of the auxiliary positioning seat (19) is provided with a movable rod (20) penetratingly installed, the top of the movable rod (20) is provided with a top disc (22), the top of the auxiliary positioning seat (19) is provided with an auxiliary force spring (23), and the auxiliary force spring (23) is located outside the movable rod (20); one end of the auxiliary force spring (23) is connected with the bottom of the top disc (22); the bottom of the movable rod (20) is provided with an auxiliary pressing strip (21), and the auxiliary pressing strip (21) is located inside the auxiliary positioning seat (19).