Clamp for electric fusion welding machine

Abstract

The utility model discloses a kind of clamps for electric melting type welding machine, belong to welding fixture technical field.It includes base, two pairs of first bidirectional screw rod, two pairs of second bidirectional screw rod, electric melting pipe and two groups of clamping pipe;First bidirectional screw rod is detachably rotatably connected in the middle part of base, second bidirectional screw rod is detachably rotatably connected in both ends of base;Electric melting pipe is divided into upper pipe and lower pipe, respectively threadedly connected in the two sides of first bidirectional screw rod;Clamping pipe is divided into upper clamping plate and lower clamping plate, respectively threadedly connected in the two sides of second bidirectional screw rod, and the central shaft of electric melting pipe and clamping pipe is coaxially arranged.This clamp can replace electric melting pipe and clamping pipe of different specifications by detachable screw rod, and has strong versatility;Bidirectional screw rod realizes component synchronous adjustment, and matching coaxial design guarantees positioning accuracy, reduces welding defect;Matched slider, roller and elastic pad, optimize operation convenience and pipeline protection effect, improve welding quality and operation efficiency, reduce equipment and maintenance cost.

Description

Technical Field

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

[0002] Clamps for electrofusion welding machines are key auxiliary equipment in the electrofusion welding of plastic pipes, widely used in water supply and drainage engineering, gas transmission, and municipal pipeline construction. In the electrofusion welding process, clamps are needed to precisely position and stably hold the pipes to be welded, ensuring a tight fit between the pipe joint and the electrofusion tube (a welding component with a built-in heating wire). Simultaneously, the electrofusion tube must be aligned with the pipe axis before the electrofusion machine can supply power to heat the electrofusion tube, achieving reliable welding of the pipes. Therefore, the positioning accuracy, versatility, and ease of operation of the clamps directly determine the welding quality and operational efficiency.

[0003] Currently, while electrofusion welding machine fixtures on the market have achieved basic clamping and positioning functions, they still have many technical defects in practical applications, making it difficult to meet diverse and high-precision welding needs. First, poor versatility is a prominent problem. The electrofusion tube assembly and clamping tube assembly of existing fixtures are mostly fixed integrated designs, and their structural dimensions are strongly bound to the specifications of the compatible pipelines. When welding pipelines of different diameters or materials, the entire fixture set must be replaced, which not only increases equipment procurement costs and inventory pressure, but also significantly reduces continuous operation efficiency due to the long time required for fixture replacement. Second, insufficient positioning accuracy. Some fixtures lack an effective coaxiality guarantee structure. The central axis of the clamping tube and the electrofusion tube is prone to shift due to adjustment deviations or vibrations, resulting in the inability of the pipeline end to be welded to accurately fit with the inner wall of the electrofusion tube. This can easily lead to uneven weld gaps and insufficient fusion during welding, which in turn causes a decrease in the sealing performance of the pipeline connection, and even poses a risk of leakage in high-pressure fluid transportation scenarios.

[0004] Therefore, developing a versatile, precise, and easy-to-operate and maintain electrofusion welding machine fixture has become an urgent problem to be solved in this field. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes a fixture for an electrofusion welding machine.

[0006] To achieve the above objectives, this utility model provides a fixture for an electrofusion welding machine, comprising:

[0007] The base has two pairs of first bidirectional screws detachably and rotatably connected to the middle part of the base, and a pair of second bidirectional screws detachably and rotatably connected to each end of the base;

[0008] An electrofusion tube is connected to an electrofusion welding machine. The electrofusion tube includes an upper tube and a lower tube, which are arranged opposite to each other. The upper tube and the lower tube are respectively threaded to both sides of the first bidirectional screw.

[0009] Two sets of clamping tubes are respectively disposed at both ends of the electrofusion tube. Each clamping tube is divided into an upper clamping plate and a lower clamping plate. The upper clamping plate and the lower clamping plate are disposed opposite to each other and are respectively threaded to both sides of the second bidirectional screw.

[0010] The central axis of the electrofusion tube is coaxial with the central axes of the two sets of clamping tubes.

[0011] Optionally, both ends of the first bidirectional screw and the second bidirectional screw are fixed with hexagonal nuts, and the base is provided with a hexagonal groove corresponding to the installation position of the first bidirectional screw and the second bidirectional screw, and the hexagonal nuts are inserted into the hexagonal groove.

[0012] Optionally, the hexagonal groove is formed inside the connecting block, and the connecting block is rotatably connected to the base via a bearing.

[0013] Optionally, wing plates extend from both sides of the upper tube and the lower tube, as well as from both sides of the upper clamping plate and the lower clamping plate, and the first bidirectional screw or the second bidirectional screw is threadedly connected to the wing plates.

[0014] Optionally, the base includes a base plate and two sliders, the two sliders being slidably connected to the base plate, the first bidirectional bolt being connected to the middle of the base plate, and two pairs of second bidirectional bolts being respectively connected to the two sliders.

[0015] Optionally, the slider is fitted with a roller at the bottom, and a slide rail is provided at the top of the base plate, with the roller sliding along the slide rail.

[0016] Optionally, elastic pads are fixedly connected inside the upper clamping plate and the lower clamping plate.

[0017] Optionally, a terminal block is fixedly connected to the top of the upper tube, and the electrofusion tube is electrically connected to the electrofusion welding machine through the terminal block.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] First, the two pairs of first bidirectional screws in the middle of the base and the pair of second bidirectional screws at each end are detachably rotatably connected to the base. The first bidirectional screws are installed correspondingly with the electrofusion tubes, and the second bidirectional screws are installed correspondingly with the clamping tubes. This design allows for the simultaneous replacement of the electrofusion tubes installed with them by disassembling and replacing the first bidirectional screws, adapting to different specifications and models of electrofusion tubes to meet the electrofusion welding needs of pipes with different diameters and materials. At the same time, the clamping tubes installed with them can be replaced simultaneously by disassembling and replacing the second bidirectional screws, allowing for the stable clamping of various specifications of welding pipes by replacing clamping tubes with different structures and sizes. This effectively breaks through the limitation of a single fixture only adapting to specific pipes and greatly expands the application range of the fixture. Second, by utilizing the threaded transmission characteristics of the bidirectional screws, the upper and lower tubes of the electrofusion tube and the upper and lower clamping plates of the clamping tube can be adjusted synchronously along the corresponding screws to achieve rapid clamping and release of the workpiece. During the adjustment process, the alignment of the upper and lower components is ensured, avoiding positional displacement caused by unilateral adjustment. Furthermore, the electrofusion tube and the two sets of clamping tubes are coaxially set, which can accurately ensure that the axis of the workpiece to be welded is completely aligned with the welding axis of the electrofusion tube. This eliminates potential quality problems such as uneven welds and poor weld sealing caused by axis misalignment, thereby improving welding accuracy and connection reliability. At the same time, the two sets of clamping tubes are located at both ends of the electrofusion tube, which can provide stable clamping force from both ends of the workpiece. Combined with the welding action of the middle electrofusion tube, the workpiece remains stable under the high temperature of welding, reducing deformation and further ensuring welding quality. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0021] Figure 1 This is a schematic diagram of the fixture structure for the electrofusion welding machine of this utility model;

[0022] Figure 2 This is a partial sectional view of the fixture for the electrofusion welding machine of this utility model;

[0023] Figure 3 This is a schematic diagram of the second bidirectional screw connection structure in this utility model;

[0024] Figure 4 This is a schematic diagram of the base structure in this utility model.

[0025] In the diagram: 1. Base; 2. First bidirectional screw; 3. Second bidirectional screw; 4. Electrofusion tube; 5. Clamping tube; 6. Hexagonal nut; 7. Hexagonal groove; 8. Connecting block; 9. Bearing; 10. Wing plate; 11. Terminal post; 101. Base plate; 102. Slider; 103. Roller; 104. Slide rail; 401. Upper tube; 402. Lower tube; 501. Upper clamping plate; 502. Lower clamping plate. Detailed Implementation

[0026] 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.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 4 As shown, this embodiment provides a fixture for an electrofusion welding machine, comprising:

[0029] The base 1 has two pairs of first bidirectional screws 2 detachably rotatably connected in the middle, and a pair of second bidirectional screws 3 detachably rotatably connected at each end of the base 1.

[0030] Electrofusion tube 4 is connected to an electrofusion welding machine. Electrofusion tube 4 includes an upper tube 401 and a lower tube 402. The upper tube 401 and the lower tube 402 are arranged opposite to each other. The upper tube 401 and the lower tube 402 are respectively threaded to both sides of the first bidirectional screw 2.

[0031] Two sets of clamping tubes 5 are respectively set at both ends of the electrofusion tube 4. The clamping tube 5 is divided into an upper clamping plate 501 and a lower clamping plate 502. The upper clamping plate 501 and the lower clamping plate 502 are arranged opposite to each other. The upper clamping plate 501 and the lower clamping plate 502 are respectively threaded to both sides of the second bidirectional screw 3.

[0032] The central axis of the electrofusion tube 4 is coaxial with the central axis of the two sets of clamping tubes 5.

[0033] First, the two pairs of first bidirectional screws 2 in the middle of the base 1 and the pair of second bidirectional screws 3 at each end are detachably rotatably connected to the base 1. The first bidirectional screws 2 are installed with the electrofusion tube 4, and the second bidirectional screws 3 are installed with the clamping tube 5. This design allows for the replacement of the first bidirectional screws 2, and the electrofusion tube 4 installed with them can be replaced simultaneously. This allows for the adaptation of electrofusion tubes 4 of different specifications and models to meet the electrofusion welding requirements of pipes of different diameters and materials. At the same time, the clamping tube 5 installed with them can be replaced simultaneously by disassembling and replacing the second bidirectional screws 3. This allows for the replacement of clamping tubes 5 with different structures and sizes to stably clamp various specifications of welding pipes. This effectively breaks through the limitation of a single clamp being only suitable for specific pipes and greatly expands the application range of the clamp. Secondly, utilizing the threaded transmission characteristics of the bidirectional screw, the upper tube 401 and lower tube 402 of the electrofusion tube 4, and the upper clamping plate 501 and lower clamping plate 502 of the clamping tube 5, can be synchronously adjusted along the corresponding screws to achieve rapid clamping and release of the workpiece. Furthermore, the alignment of the upper and lower components is ensured during adjustment, preventing positional shifts caused by unilateral adjustment. Moreover, the coaxial arrangement of the electrofusion tube 4 and the two sets of clamping tubes 5 ensures precise alignment between the axis of the workpiece to be welded and the welding axis of the electrofusion tube 4, eliminating quality issues such as uneven welds and poor weld sealing caused by axis misalignment, thus improving welding accuracy and connection reliability. Simultaneously, the two sets of clamping tubes 5, located at both ends of the electrofusion tube 4, provide stable clamping force from both ends of the workpiece. Combined with the welding action of the middle electrofusion tube 4, this ensures the workpiece remains stable under high welding temperatures, reducing deformation and further guaranteeing welding quality.

[0034] In some alternative implementations, both ends of the first bidirectional screw 2 and the second bidirectional screw 3 are fixed with hexagonal nuts 6, and the base 1 has a hexagonal groove 7 corresponding to the installation position of the first bidirectional screw 2 and the second bidirectional screw 3, and the hexagonal nuts 6 are inserted into the hexagonal groove 7.

[0035] First, the fitting structure of the hexagonal nut 6 and the hexagonal groove 7 can precisely restrict the circumferential rotation of the first bidirectional screw 2 or the second bidirectional screw 3, avoiding unnecessary circumferential offset of the first bidirectional screw 2 or the second bidirectional screw 3 during the adjustment process (such as rotating the first bidirectional screw 2 to adjust the upper tube 401 and lower tube 402 of the electrofusion tube 4, or rotating the second bidirectional screw 3 to adjust the distance between the upper clamping plate 501 and lower clamping plate 502 of the clamping tube 5). This ensures that the screws only drive the corresponding components to adjust synchronously along the axial direction, significantly improving the stability and accuracy of the adjustment process and ensuring the positioning accuracy of the electrofusion tube 4 and the clamping tube 5 on the workpiece. Second, the design of the double-headed hexagonal nut 6 allows the first bidirectional screw 2 or the second bidirectional screw 3 to be rotated by tools such as electric screwdrivers and wrenches to tighten or loosen the welding pipeline while one end is inserted into the base 1.

[0036] In some alternative implementations, a hexagonal groove 7 is formed within a connecting block 8, and the connecting block 8 is rotatably connected to the base 1 via a bearing 9.

[0037] On the one hand, the bearing 9 connection between the connecting block 8 and the base 1 can significantly reduce the frictional resistance when they rotate relative to each other, making the first bidirectional screw 2 and the second bidirectional screw 3 in the hexagonal groove 7 rotate more smoothly. This avoids rotational jamming or component wear caused by excessive friction. Especially in operations where the distance between the electrofusion tube 4 and the clamping tube 5 is frequently adjusted, it can improve the ease of operation and adjustment efficiency. On the other hand, the bearing 9 structure can precisely limit the rotation trajectory of the connecting block 8, ensuring that the connecting block 8 rotates stably only along the preset axis. This ensures that the screw maintains accurate axial positioning during rotation, preventing the screw from tilting due to the offset of the connecting block 8. It also ensures the alignment of the upper tube 401 and lower tube 402 of the electrofusion tube 4 and the upper clamping plate 501 and lower clamping plate 502 of the clamping tube 5 during adjustment, indirectly improving the workpiece welding positioning accuracy. At the same time, the bearing 9 can effectively disperse the radial force generated during screw rotation and clamping operations, preventing the force from being directly transmitted to the base 1 and causing local wear on the base 1. This extends the service life of the base 1 and the connecting block 8 and enhances the overall durability of the fixture structure.

[0038] In some alternative embodiments, wing plates 10 extend from both sides of the upper tube 401 and the lower tube 402, as well as from both sides of the upper clamping plate 501 and the lower clamping plate 502, and the first bidirectional screw 2 or the second bidirectional screw 3 is threadedly connected to the wing plate 10.

[0039] First, the wing plate 10 structure effectively expands the connection contact area between the first bidirectional screw 2 and the electrofusion tube 4, and between the second bidirectional screw 3 and the clamping tube 5. This avoids the local stress concentration problem that easily occurs when the first bidirectional screw 2 or the second bidirectional screw 3 is directly connected to the small area of ​​the tube body of the electrofusion tube 4 and the clamping tube 5. This makes the threaded connection more uniformly stressed, better able to withstand the axial force during the adjustment process and the vibration and impact force during the welding operation, significantly improving the stability and durability of the connection structure and reducing the deformation or damage of components due to stress overload. Second, the symmetrically extended wing plate 10 provides the screw with a precise and symmetrical connection. By using a reference, it is ensured that the upper tube 401 and lower tube 402 of the electrofusion tube 4, and the upper clamping plate 501 and lower clamping plate 502 of the clamping tube 5, maintain a synchronous and stable movement trajectory when adjusting the spacing along the screw thread. This prevents unilateral tilting or jamming due to connection point offset, indirectly ensuring the coaxiality of the electrofusion tube 4 and the clamping tube 5, and further improving the positioning accuracy of the workpiece to be welded. At the same time, the setting of the wing plate 10 also provides a clear positioning guide for the assembly of the screw with the electrofusion tube 4 and the clamping tube 5, simplifying the assembly process, reducing the requirements for component alignment accuracy during installation, and improving the convenience of fixture assembly and subsequent maintenance.

[0040] In some alternative embodiments, the base 1 includes a base plate 101 and two sliders 102, the two sliders 102 being slidably connected to the base plate 101, a first bidirectional bolt being connected to the middle of the base plate 101, and two pairs of second bidirectional bolts being connected to the two sliders 102 respectively.

[0041] The sliding engagement between slider 102 and base plate 101 allows for flexible adjustment of the positions of the two sliders 102 on base plate 101. This not only drives the second bidirectional screw 3 connected to slider 102 and clamping tube 5 to move synchronously, adapting to different lengths of pipes to be welded, but also allows the clamping tube 5 and the fixed pipe to move closer to or further away from the electrofusion tube 4 by pushing slider 102. This facilitates precise adjustment of the depth of the pipe into the electrofusion tube 4, ensuring that the pipe has a contact length that meets the welding process requirements within the electrofusion tube 4. This avoids problems such as insufficient welding strength due to shallow insertion or excessive insertion affecting the welding space inside the electrofusion tube 4, further guaranteeing welding quality and reliability.

[0042] In some alternative embodiments, the slider 102 is fitted with a roller 103 at the bottom, and the top of the base plate 101 is provided with a slide rail 104, along which the roller 103 slides.

[0043] On the one hand, the rolling cooperation between the roller 103 and the slide rail 104 transforms the sliding friction between the slider 102 and the base plate 101 into rolling friction, significantly reducing the frictional resistance during their relative movement. This not only makes it easier and more convenient for operators to adjust the position of the slider 102, effectively reducing operational intensity, but also avoids the problem of adjustment jamming caused by excessive frictional resistance, improving the smoothness of slider 102 movement and operational efficiency. On the other hand, the slide rail 104 provides precise guidance for the movement trajectory of the roller 103, strictly limiting the slider 102 to move stably only along the direction of the slide rail 104, preventing the slider 102 from shifting laterally or tilting during sliding, further ensuring that the coaxiality of the clamping tube 5 and the electrofusion tube 4 is not affected by the adjustment of the slider 102, and ensuring the positioning accuracy of the pipeline to be welded. At the same time, the wear of rolling friction is much less than that of sliding friction, which can significantly reduce the wear on the bottom of the slider 102 and the top of the base plate 101, extend the service life of the slider 102 and the base plate 101, reduce the maintenance frequency and cost of the fixture due to component wear, and improve the overall durability of the fixture.

[0044] In some alternative implementations, elastic pads are fixed inside the upper clamping plate 501 and the lower clamping plate 502.

[0045] The elastic pad acts as a buffer when clamping pipes, preventing the hard clamp from directly contacting the pipe surface and causing scratches, pressure marks, or other damage. This is especially effective for plastic or coated metal pipes, which are prone to surface damage, protecting their outer surface integrity. At the same time, the elastic pad can adapt to the slight irregularities on the pipe surface, allowing the clamping force to be distributed more evenly across the pipe surface. This prevents excessive local clamping force from causing pipe deformation and further ensures the structural stability and sealing of the pipe after welding.

[0046] In some alternative embodiments, a terminal block 11 is fixedly connected to the top of the upper tube 401, and the electrofusion tube is electrically connected to the electrofusion welding machine through the terminal block 11.

[0047] Terminal 11 provides a stable and reliable dedicated electrical interface between the electrofusion tube 4 and the welding machine, avoiding problems such as poor contact and loosening that may occur when the wire is directly wrapped or temporarily fixed to the electrofusion tube 4. It ensures the continuity and stability of current transmission during the welding process. Stable current is the key to uniform heating of the electrofusion tube 4, which can effectively avoid defects such as uneven heating, insufficient fusion or over-fusion caused by current fluctuations, thus ensuring welding quality. Terminal 11 is fixed at the top of the upper tube 401, which not only makes it easy for operators to quickly locate and connect the welding machine circuit, simplifying the wiring operation process and improving work efficiency, but also allows for easy replacement of the electrofusion tube 4. Only the connection at terminal 11 needs to be disconnected, without damaging the electrofusion tube 4 body or the welding machine circuit, reducing the difficulty of disassembly and assembly and maintenance costs.

[0048] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.

[0049] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A fixture for an electrofusion welding machine, characterized in that, include: The base (1) has two pairs of first bidirectional screws (2) detachably rotatably connected in the middle, and a pair of second bidirectional screws (3) detachably rotatably connected at each end of the base (1). An electrofusion tube (4) is connected to an electrofusion welding machine. The electrofusion tube (4) includes an upper tube (401) and a lower tube (402). The upper tube (401) and the lower tube (402) are arranged opposite to each other. The upper tube (401) and the lower tube (402) are respectively threaded to both sides of the first bidirectional screw (2). Two sets of clamping tubes (5) are respectively disposed at both ends of the electrofusion tube (4). The clamping tube (5) is divided into an upper clamping plate (501) and a lower clamping plate (502). The upper clamping plate (501) and the lower clamping plate (502) are disposed opposite to each other. The upper clamping plate (501) and the lower clamping plate (502) are respectively threaded to both sides of the second bidirectional screw (3). The central axis of the electrofusion tube (4) is coaxial with the central axis of the two sets of clamping tubes (5).

2. The fixture for an electrofusion welding machine according to claim 1, characterized in that, Both ends of the first bidirectional screw (2) and the second bidirectional screw (3) are fixed with hexagonal nuts (6). The base (1) has a hexagonal groove (7) corresponding to the installation position of the first bidirectional screw (2) and the second bidirectional screw (3). The hexagonal nut (6) is inserted into the hexagonal groove (7).

3. The fixture for an electrofusion welding machine according to claim 2, characterized in that, The hexagonal groove (7) is formed in the connecting block (8), and the connecting block (8) and the base (1) are rotatably connected by a bearing (9).

4. The fixture for an electrofusion welding machine according to claim 1, characterized in that, Wing plates (10) extend from both sides of the upper tube (401) and the lower tube (402), as well as from both sides of the upper clamping plate (501) and the lower clamping plate (502). The first bidirectional screw (2) or the second bidirectional screw (3) is threadedly connected to the wing plate (10).

5. The fixture for an electrofusion welding machine according to claim 1, characterized in that, The base (1) includes a base plate (101) and two sliders (102). The two sliders (102) are slidably connected to the base plate (101). The first bidirectional bolt is connected to the middle of the base plate (101), and two pairs of second bidirectional bolts are respectively connected to the two sliders (102).

6. The fixture for an electrofusion welding machine according to claim 5, characterized in that, The slider (102) is fitted with a roller (103) at the bottom, and the top of the base plate (101) is provided with a slide rail (104), and the roller (103) slides along the slide rail (104).

7. The fixture for an electrofusion welding machine according to claim 1, characterized in that, The upper clamping plate (501) and the lower clamping plate (502) are internally fixed with elastic pads.

8. The fixture for an electrofusion welding machine according to claim 1, characterized in that, The top of the upper tube (401) is fixedly connected to a terminal block (11), and the electrofusion tube is electrically connected to the electrofusion welding machine through the terminal block (11).

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