A pipe clamp and welding jig

Abstract

The utility model relates to a fixed tool, especially relates to a pipe clamp and welding jig. The first direction and the second direction are perpendicular and horizontal, and the pipe clamp comprises two oppositely arranged and mutually close or far away along the second direction clamping jaws. The clamping jaw comprises the rectangular long strip clamp block extending along the first direction. The two clamping blocks are all protruded to form the triangular clamping ridge. The two inclined surfaces of the clamping ridge are ridge surfaces, and the tip of the clamping ridge forms a contact groove. The ridge surface of the clamping ridge is protruded to form multiple pairs of clamping teeth arranged along the first direction, the clamping tooth has the outer tooth surface extending along the second direction and the inner tooth surface angularly matched with the ridge surface, and the surface of each inner tooth surface forms a flexible friction surface. The welding jig comprises the alignment clamp and the straightening clamp connected to the support frame and all being the pipe clamp. The alignment clamp is adjacent to the pipe end face and is three-way adjustable, and the straightening clamp is adjustable in the vertical and horizontal radial direction of the pipe. The pipe clamp in the application has strong three-way constraint force on the pipe and is not easy to damage the pipe.

Description

Technical Field

[0001] This utility model relates to fixing fixtures, and in particular to a pipe clamp and welding fixture. Background Technology

[0002] When welding pipes, the bent pipes need to be initially straightened before clamping the two pipes to be connected, ensuring their end faces are facing each other, and then welding is performed. In existing technology, two clamping blocks are typically used to fix the pipes radially. However, because the pipe is not perfectly straight, it is subjected to stress in multiple directions. Therefore, the position and orientation of the pipe end face often deviate after fixing, and may even lead to loosening of the clamp. When high welding precision is required, such as when post-weld industrial computed tomography (CT) scans are required to be defect-free, or when the misalignment gap between two pipes is required to be less than a preset value, simple clamping is insufficient to achieve high-precision end face positioning and orientation, as well as a secure clamping. Therefore, improvements to the clamp are necessary. Utility Model Content

[0003] The purpose of this utility model is to provide a pipe clamp and welding fixture with better clamping effect.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A pipe clamp includes two opposing jaws extending along a first horizontal direction and moving closer to or further away from each other along a second horizontal direction perpendicular to the first direction. Each jaw includes a rectangular strip-shaped clamping block, a ridge connected to the clamping block, and clamping teeth connected to the ridge. The ridge is formed by a protrusion on the surface of the clamping block near the other clamping block. The ridge has a triangular cross-section and two inclined ridge surfaces directly connected to the clamping block. An abutment groove connecting the two ridge surfaces is formed at the end of the ridge away from the clamping block. Partial surface protrusions form multiple clamping teeth spaced apart along the first direction. The clamping teeth connected to the two ridge surfaces correspond one-to-one. Each clamping tooth has an outer tooth surface extending along the second direction and an inner tooth surface connecting the outer tooth surface and the edge of the contact groove. The angle of the inner tooth surface matches the ridge surface. The clamping teeth of the two jaws are arranged in a staggered manner. The surface of each inner tooth surface is formed with a flexible friction surface. When the two jaws abut against each other, the contact grooves of the two jaws form a rhomboid cavity extending along the first direction, and the inner tooth surface of each clamping tooth abuts against the ridge surface of the other jaw.

[0005] Optionally, the pipe clamp further includes a clamping seat, a clamping screw, and a clamping slider. The clamping seat has a clamping slide rail on its surface, which extends along the second direction. The clamping screw is rotatably connected to the clamping seat, extends along the second direction, and can be controllably rotated along the central axis. The clamping slider is slidably connected to the clamping slide rail and has a threaded hole that passes through the clamping slider along the second direction. The threaded hole fits into the outer wall of the clamping screw. The same clamping screw passes through two opposing clamping sliders, and the two clamping sliders move closer or further away from each other synchronously along the second direction as the clamping screw rotates. The jaws are connected to the surface of the clamping slider, and the friction surface is made of nylon.

[0006] This utility model also provides a welding fixture, including an alignment clamp, a straightening clamp, and a support frame. The alignment clamp and the straightening clamp are both pipe clamps as described above. The alignment clamp can be controllably clamped or released to clamp the position of the end face of the pipe to be welded adjacent to it. The pipe extends horizontally along a first direction. The alignment clamp can be controllably slid in the first direction and in a second direction that is horizontal and perpendicular to the first direction. Its height in the longitudinal direction is adjustable. The straightening clamp is disposed adjacent to the alignment clamp and can be controllably clamped or released to straighten the portion of the pipe adjacent to the end face together with the alignment clamp. The straightening clamp can be controllably slid in the second direction and its height in the longitudinal direction is adjustable. The support frame is used to connect and support the alignment clamp and the straightening clamp.

[0007] Optionally, the straightening clamp can slide freely in the first direction.

[0008] Optionally, the welding fixture further includes a vertical mechanism, a radial mechanism, a first axial mechanism, and a second axial mechanism. The alignment clamp is connected to the first axial mechanism, the straightening clamp is connected to the second axial mechanism, both the first and second axial mechanisms are connected to the radial mechanism, and each radial mechanism is connected to the vertical mechanism. Each vertical mechanism is connected to the support frame, including a vertical screw extending in the vertical direction and rotating around its central axis, and a vertical slider controllably movable in the vertical direction with the rotation of the vertical screw. The radial mechanism is connected to the vertical slider, including a radial screw extending in the second direction and rotating around its central axis, and a vertical slider controllably movable in the vertical direction with the rotation of the radial screw. A radial slider that can move controllably in two directions, the second axial mechanism includes an axial connecting plate and an axial slider connected to the radial slider, the surface of the axial connecting plate is formed with an axial slide rail extending along the first direction, the axial slider is slidably connected to the axial slide rail of the second axial mechanism, the axial slider of the second axial mechanism slides freely along the axial slide rail, and the straightening clamp is supported on the axial slider of the second axial mechanism, the first axial mechanism includes the axial connecting plate and the axial slider, and also includes an axial screw connected to the axial connecting plate and extending along the first direction, the axial slider of the first axial mechanism slides controllably along the first direction with the rotation of the axial screw.

[0009] Optionally, the vertical mechanism further includes a vertical reducer and a vertical knob, the vertical reducer being connected between the vertical screw and the vertical knob, the vertical screw rotating as the vertical knob rotates; the radial mechanism further includes a radial reducer and a radial knob, the radial reducer being connected between the radial screw and the radial knob, the radial screw rotating as the radial knob rotates; the first axial mechanism further includes an axial reducer and an axial knob, the axial reducer being connected between the axial screw and the axial knob, the axial screw rotating as the axial knob rotates.

[0010] Optionally, at least a portion of the vertical mechanism includes a steering assembly connected between the vertical reducer and the vertical knob, such that the central axis of the vertical knob extends horizontally.

[0011] Optionally, the support frame includes a base frame, a mounting frame, and a lifting mechanism. The base frame and the mounting frame are both horizontally arranged. The lifting mechanism is connected between the base frame and the mounting frame, so that the mounting frame is supported by the base frame. The lifting mechanism is used to controllably adjust the distance between the base frame and the mounting frame in the vertical direction. The alignment clamp and the straightening clamp are both connected to the mounting frame.

[0012] Optionally, the mounting bracket carries two sets of oppositely arranged alignment clamps and straightening clamps.

[0013] Optionally, the support frame includes a drawer, casters, and adjustable feet connected to the support frame. The support frame has a receiving cavity with an opening facing to the side. The drawer is connected to the receiving cavity. The casters are connected to the bottom of the support frame. The adjustable feet are connected to the support frame for controllably adjusting the bottom height of the support frame. The support frame is supported by the casters and / or the adjustable feet.

[0014] According to a first aspect of this invention, applying pressure along two inclined radial directions to the pipe using internal toothed surfaces helps constrain the pipe's position in the vertical and second directions. By clamping the pipe with inclined internal toothed surfaces, the number of contact points between the conventional gripper and the pipe is increased from one to two, which helps improve friction and distribute pressure, preventing pipe deformation or slippage, and achieving positioning and clamping of the pipe in the first direction. Applying pressure to the pipe with a flexible friction surface helps improve friction and reduce the risk of pipe deformation or surface damage. By constructing the gripper as an elongated strip extending along the first direction and providing abutment grooves, friction can be improved to suppress pipe slippage in the first direction, and a slight straightening of the corresponding portion of the pipe can also be achieved, helping to keep the pipe end face vertical and facilitating improved welding quality.

[0015] Furthermore, the rotation of the clamping screw causes the two clamping sliders to clamp or separate the two jaws, which helps to improve the uniformity of the pressure from the pipe on the two jaws and makes it easier to maintain the consistency between the position of the pipe after clamping and the initial external placement.

[0016] According to a second aspect of this invention, clamping the pipe near its end face with an adjustable alignment clamp helps improve the accuracy of the pipe's position. The straightening clamp, located near the alignment clamp, helps to achieve local straightening of the pipe's end face, ensuring the pipe's end face is vertical and improving welding quality.

[0017] Furthermore, the straightening clamp is made movable in the first direction, which facilitates the movement of the pipe towards the end face of another pipe after the alignment clamp and the straightening clamp clamp the pipe.

[0018] Furthermore, the position of the alignment clamp and straightening clamp in three directions is adjusted by the screw, which has high precision and is easy to fine-tune.

[0019] Furthermore, by setting up a speed reducer, the force required to rotate the corresponding screws is reduced, and the accuracy of position adjustment is improved, which helps to improve the accuracy and convenience of positioning operations.

[0020] Furthermore, the vertical knobs corresponding to the alignment clamp and / or straightening clamp are positioned to the side rather than below them by the steering component, reducing the difficulty of operation.

[0021] Furthermore, by setting up a lifting mechanism, the height of each alignment clamp and straightening clamp can be adjusted significantly, making it easier to use with different welding fixtures and thus improving the convenience of operation.

[0022] Furthermore, the two sets of alignment clamps and straightening clamps are placed on the same mounting frame to ensure that the heights of the two sets of alignment clamps and straightening clamps are consistent, which facilitates alignment.

[0023] Furthermore, drawers provide storage space for operating accessories, reducing operational complexity. Casters and adjustable feet facilitate the movement and positioning of the entire support frame.

[0024] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the welding fixture shown in Embodiment 1 of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0026] Legend: 1-Support frame, 11-Base frame, 111-Wheel caster, 112-Adjustable foot, 12-Lifting mechanism, 13-Mounting bracket, 131-Connecting part, 132-Bearing part, 133-Accommodation part, 134-First crossbeam, 135-Second crossbeam, 136-Drawer, 2-Vertical mechanism, 21-Vertical connecting plate, 211-Vertical slide rail, 22-Vertical screw, 23-Vertical slider, 231-Vertical threaded part, 232-Vertical sliding part, 24-Vertical reducer, 25-Vertical knob, 26-Steering assembly, 3-Radial mechanism, 31-Radial connecting plate, 311 - Radial slide rail, 32- Radial screw, 33- Radial slider, 34- Radial reducer, 35- Radial knob, 4- First axial mechanism, 41- Axial connecting plate, 411- Axial slide rail, 42- Axial screw, 43- Axial slider, 44- Axial reducer, 45- Axial knob, 5- Second axial mechanism, 6- Alignment clamp, 61- Clamping seat, 611- Clamping slide rail, 62- Clamping screw, 63- Clamping slider, 64- Claw, 641- Clamping block, 642- Clamping ridge, 643- Abutting groove, 644- Clamping tooth, 645- External tooth surface, 646- Internal tooth surface, 7- Straightening clamp. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0031] The pipe clamp claimed in this utility model application includes two opposing clamps 64. The clamps 64 extend along a first horizontal direction and move closer to or further away from each other along a second horizontal direction, which is perpendicular to the first direction. Each clamp 64 includes a rectangular strip-shaped clamping block 641, a ridge 642 connected to the clamping block 641, and clamping teeth 644 connected to the ridge 642. The ridge 642 is formed by a protrusion on the surface of the clamping block 641 near the other clamping block 641. The ridge 642 has a strip-shaped structure with a triangular cross-section and has two inclined ridge surfaces directly connected to the clamping block 641. The end of the ridge 642 away from the clamping block 641 forms a connection between the two ridge surfaces. The contact groove 643 of the surface and the ridge surface of the ridge 642 are raised to form a plurality of clamping teeth 644 arranged at intervals along the first direction. The clamping teeth 644 have an outer tooth surface 645 extending along the second direction and an inner tooth surface 646 connecting the outer tooth surface 645 and the edge of the contact groove 643. The angle of the inner tooth surface 646 matches the ridge surface. The clamping teeth 644 of the two jaws 64 are arranged in a staggered manner. The surface of each inner tooth surface 646 is formed with a flexible friction surface. When the two jaws 64 abut against each other, the contact grooves 643 of the two jaws 64 form a rhomboid cavity extending along the first direction, and the inner tooth surface 646 of each clamping tooth 644 abuts against the ridge surface of the other jaw 64.

[0032] Applying pressure along two inclined radial directions to the pipe via the internal toothed surface 646 helps constrain the pipe's position in the vertical and second directions. By clamping the pipe with the inclined internal toothed surface 646, the number of contact points between the conventional jaws 64 and the pipe is increased from one to two, which helps improve friction and distribute pressure, preventing pipe deformation or slippage, and achieving positioning and clamping of the pipe in the first direction. Applying pressure to the pipe with a flexible friction surface helps improve friction and reduce the risk of pipe deformation or surface damage. By constructing the jaws 64 as elongated strips extending along the first direction and providing abutment grooves 643, friction can be improved to suppress pipe slippage in the first direction, and a slight straightening of the corresponding portion of the pipe can also be achieved, helping to keep the pipe end face vertical and facilitating improved welding quality.

[0033] Please refer to the following examples for details.

[0034] Example 1: Please see Figure 1 The welding fixture shown in a preferred embodiment of this application includes a support frame 1 and a vertical mechanism 2, a radial mechanism 3, a first axial mechanism 4, a second axial mechanism 5, an alignment clamp 6, and a straightening clamp 7 connected to the support frame 1.

[0035] The support frame 1 includes a base frame 11, a mounting frame 13, and a lifting mechanism 12. The base frame 11 includes a rectangular frame structure formed by square tubing, and a steel plate embedded in the edge of the frame structure near its bottom. The base frame 11 is horizontally positioned, with its edges extending along a first and a second direction, respectively, and the length of the base frame 11 in the first direction is greater than its length in the second direction. Four identical casters 111 are connected to the four corners of the base frame 11, facilitating the movement of the support frame 1 as a whole. Each corner of the base frame 11 extends along the second direction, and an adjustable foot 112 is installed at each end. The four adjustable feet 112 are arranged in a rectangle, and their height is controllably adjustable. When the height of the adjustable foot 112 is less than the height of the casters 111, the adjustable foot 112 is suspended, and the casters 111 support the base frame 11, making the support frame 1 easy to move. When the height of the adjustable foot 112 is greater than the height of the caster wheel 111, the caster wheel 111 is suspended in the air, and the base frame 11 is supported by the adjustable foot 112. At this time, the support frame 1 is difficult to move as a whole, thus achieving positioning.

[0036] The lifting mechanism 12 is a scissor-type lifting mechanism 12, the bottom of which is connected to the base frame 11, and its height is adjusted by a lifting screw arranged along the first direction. The lifting screw is rotatably connected to the base frame 11, and one end passes through the base frame 11 and is connected to a lifting knob, so as to facilitate manual rotation of the lifting screw to adjust the height of the lifting mechanism 12.

[0037] The mounting frame 13 is an axisymmetric structure, symmetrical along its centerline in both the first and second directions. The mounting frame 13 includes a connecting portion 131, a supporting portion 132, and a receiving portion 133. The connecting portion 131 is horizontally positioned and mounted on top of the lifting mechanism 12, and can be controllably raised and lowered by the lifting mechanism 12. The structure of the connecting portion 131 is similar to that of the base plate, except that the steel plate of the connecting portion 131 is connected to the edge of the frame structure near the top, and the connecting portion 131 is positioned opposite to the base plate. The receiving portion 133 is connected to the center above the connecting portion 131, and forms a supporting portion 132 on each side along the first direction. The two supporting portions 132 have the same structure but are positioned in opposite directions. The supporting portion 132 is formed by multiple square tubes along the first, second, and vertical directions, and its shape is approximately cuboid. Two vertically extending square tubes are respectively positioned at the edges of the connecting portion 131. These two tubes, extending in the first direction, are longer and extend away from the receiving portion 133, with their ends connected by a square tube extending in the second direction. In the two supporting portions 132, the square tube closest to the receiving portion 133 and extending in the second direction serves as the first crossbeam 134, and the square tube away from the receiving portion 133 and extending in the second direction serves as the second crossbeam 135. Two square tubes extending in the second direction are connected directly below the two first crossbeams 134, and are connected by the two square tubes extending in the first direction, so that the two supporting portions 132 together form a cubic frame structure. Steel plates enclose each side of the frame structure, forming a receiving portion 133 with an opening on only one side. The opening of the receiving portion 133 faces the second direction. Two vertically stacked drawers 136 are installed inside the receiving portion 133 for storing welding rods and other welding-related materials and tools.

[0038] Alignment clamp 6 and straightening clamp 7 are connected to support frame 1 via vertical mechanism 2, radial mechanism 3, first axial mechanism 4, and second axial mechanism 5. Specifically, the two vertical mechanisms 2 are respectively connected to the first crossbeam 134 and the second crossbeam 135; the two radial mechanisms 3 are respectively connected to the two vertical mechanisms 2; and the first axial mechanism 4 and the second axial mechanism 5 are respectively connected to the two vertical mechanisms 2, such that the first axial mechanism 4 is mounted on the first crossbeam 134 and the second axial mechanism 5 is mounted on the second crossbeam 135. Alignment clamp 6 is connected to the first axial mechanism 4, and straightening clamp 7 is connected to the second axial mechanism 5.

[0039] Please see Figure 1 and Figure 2The vertical mechanism 2 includes a vertical connecting plate 21, a vertical screw 22, a vertical slider 23, a vertical reducer 24, and a vertical knob 25. The vertical connecting plate 21 is vertically positioned, with its top end fixedly connected to the side of the first crossbeam 134 or the second crossbeam 135 away from the receiving portion 133. A vertically extending vertical slide rail 211 is formed on the side of the vertical connecting plate 21 away from the receiving portion 133, and the vertical slide rail 211 has a larger width in the second direction. The middle of the vertical connecting plate 21 is hollowed out, making it frame-like, and the hollowed-out portion extends through the middle of the vertical slide rail 211 along the first direction. The vertical screw 22 extends vertically, is embedded in the hollowed-out portion of the vertical connecting plate 21, and both ends are rotatably connected to the vertical connecting plate 21. The vertical slider 23 includes a vertically threaded portion 231 and a vertically sliding portion 232 connected to each other. The vertically threaded portion 231 is sleeved on the outside of the vertical screw 22 and engages with the vertical screw 22. The vertically sliding portion 232 is constructed as a vertically arranged rectangular plate and is slidably connected to the vertical slide rail 211. The vertically threaded portion 231 is connected to the side of the vertically sliding portion 232 near the receiving portion 133. The bottom end of the vertical screw 22 passes through the vertical connecting plate 21 and extends to the outside. The vertical reducer 24 is installed below the vertical connecting plate 21 and connected to the vertical screw 22. The vertical knob 25 is connected to the bottom of the vertical reducer 24. By manually rotating the vertical knob 25, the vertical screw 22 is rotated, thereby fine-tuning the height of the vertical slider 23. The vertical reducer 24 improves the adjustment accuracy and reduces the force required to rotate the knob. The vertical mechanism 2 connected to the first crossbeam 134 also includes a steering assembly 26. The steering assembly 26 is connected between the vertical reducer 24 and the vertical knob 25, so that the central axis of the vertical knob 25 extends in the second direction, thereby preventing the distance between the vertical knob 25 and the receiving part 133 from being too small and difficult to operate.

[0040] The radial mechanism 3 includes a radial connecting plate 31, a radial screw 32, a radial threaded component, a radial slider 33, a radial reducer 34, and a radial knob 35. The radial connecting plate 31 is a horizontally positioned rectangular plate, its bottom supported and fixedly connected to the top of the vertical slider 23. Two radial slide rails 311 extending along a second direction are formed on the upper surface of the radial connecting plate 31. The radial screw 32 extends along the second direction and is positioned between the two radial slide rails 311, rotatably connected to the radial connecting plate 31, and controllably rotates along its central axis. One end of the radial screw 32 is connected to the radial knob 35 via the radial reducer 34, and rotates controllably with the rotation of the radial knob 35. The radial threaded component is sleeved on the outside of the radial screw 32 and engages with it. The radial slider 33 is horizontally positioned and slidably connected to the radial slide rails 311. Both the radial threaded component and the radial slider 33 are fixedly connected to the first axial mechanism 4 or the second axial mechanism 5. When the radial screw 32 rotates, the first axial mechanism 4 or the second axial mechanism 5 slides along the radial slide rail 311.

[0041] The first axial mechanism 4 includes an axial connecting plate 41, an axial screw 42, an axial threaded component, an axial slider 43, an axial reducer 44, and an axial knob 45. The axial connecting plate 41 is rectangular and arranged along a first direction, with its bottom fixedly connected to both the radial threaded component and the radial slider 33. Two axial slide rails 411 extending along the first direction are formed on the upper surface of the axial connecting plate 41. The axial screw 42 extends along the first direction and is positioned between the two axial slide rails 411, rotatably connected to the axial connecting plate 41, and controllably rotates along its central axis. One end of the axial screw 42 is connected to the axial knob 45 via the axial reducer 44, and rotates controllably with the rotation of the axial knob 45. The axial threaded component is sleeved on the outside of the axial screw 42 and engages with it. The axial slider 43 is horizontally arranged and slidably connected to the axial slide rails 411. The axial threaded component and the axial slider 43 are simultaneously fixedly connected to the bottom of the alignment clamp 6. When the axial screw 42 rotates, the alignment clamp 6 slides along the axial slide rail 411.

[0042] The difference between the second axial mechanism 5 and the first axial mechanism 4 is that the second axial mechanism 5 does not include the axial screw 42, axial threaded parts, axial reducer 44 and axial knob 45. The axial slider 43 is fixedly connected to the bottom of the straightening clamp 7, so that the straightening clamp 7 can slide freely in the first direction.

[0043] The alignment clamp 6 and straightening clamp 7 are identical pipe clamps, including a clamp base 61, a clamping screw 62, a clamping slider 63, and grippers 64. The clamp base 61 is a rectangular plate, horizontally positioned along a first direction, and its bottom surface is fixedly connected to either the first axial mechanism 4 or the second axial mechanism 5. Two clamping slide rails 611 extending along a second direction are formed on the surface of the clamp base 61, with each end of one of the clamping slide rails 611 connected to the ends of the other clamping slide rail 611. The clamping screw 62, extending along the second direction, is positioned between the two clamping slide rails 611 and rotatably connected to the clamp base 61, thus rotating along its central axis. Both clamping sliders 63 are slidably connected to the clamping slide rail 611. The clamping screw 62 passes through the clamping sliders 63 along the second direction, forming a threaded hole on the clamping slider 63 that matches the clamping screw 62. The thread directions of the portions of the clamping screw 62 corresponding to the two clamping sliders 63 are opposite, causing the two clamping sliders 63 to slide in opposite directions as the clamping screw 62 rotates. Two jaws 64 are respectively connected to the two clamping sliders 63 and are used to clamp or release the pipe positioned along the first direction.

[0044] The gripper 64 includes a rectangular strip-shaped gripping block 641, a ridge 642 connected to the gripping block 641, and gripping teeth 644 connected to the ridge 642. The gripping block 641 extends along a first direction, and its surface near another gripping block 641 protrudes to form a ridge 642. The ridge 642 has a triangular cross-section and two inclined ridge surfaces directly connected to the gripping block 641. A concave triangular abutment groove 643 is formed at the end of the ridge 642 away from the gripping block 641, connecting the two ridge surfaces. The two sides of the inner wall of the groove are parallel to the two ridge surfaces. The ridge surface portion of the ridge 642 protrudes to form multiple gripping teeth 644 spaced apart along the first direction. The gripping teeth 644 on the two ridge surfaces of the same ridge 642 are flush with each other in the first direction. The gripping teeth 644 are triangular and have an outer tooth surface 645 and an inner tooth surface 646. The outer tooth surface 645 is horizontal and extends along the second direction. The inner tooth surface 646 connects the outer tooth surface 645 and the edge of the contact groove 643, and its direction is parallel to the other ridge surface of the same gripper 64. The inner wall of the contact groove 643 and the surface of each inner tooth surface 646 are covered with nylon material to form a flexible friction surface. The gripping teeth 644 of the two mating grippers 64 are arranged in a staggered manner. When the two grippers 64 abut against each other, the contact grooves 643 of the two grippers 64 form a rhomboid cavity extending along the first direction, and the inner tooth surface 646 of each gripping tooth 644 abuts against the ridge surface of the other gripper 64.

[0045] Since the internal tooth surfaces 646 of the alignment clamp 6 and the straightening clamp 7 all abut against the pipe, the contact area between the pipe and the clamping jaws 64 is large, which helps to improve the friction. Furthermore, when the pipe is clamped between the two sets of clamping teeth 644, the pipe is sufficiently constrained in both the second direction and the vertical direction. The clamping jaws 64 are longer in the first direction and have multiple sets of clamping teeth 644 that clamp the pipe separately; therefore, the alignment clamp 6 and the straightening clamp 7 have a certain straightening function. The nylon material has good flexibility and a high coefficient of friction, protecting the pipe surface while also providing constraint on the pipe in the first direction.

[0046] When welding the end faces of two pipes, the support frame 1 is moved to a preset position by the casters 111 and positioned by the adjustable feet 112. The height of the mounting frame 13 is adjusted to match the argon arc welding machine by the lifting mechanism 12. The pipes separated from the cable reel and preliminarily straightened are clamped into the welding fixture. First, two alignment clamps 6 clamp the adjacent end faces of the two pipes to make them close together. Then, the pipes with residual bending deformation are pressed into the straightening clamps 7 to clamp the corresponding positions of the pipes, thereby slightly straightening the pipes. Then, the vertical mechanism 2, radial mechanism 3, and first axial mechanism 4 are adjusted to make the end faces of the two pipes close together and flush. The relative position of the end faces of the two pipes to be welded is measured by a flashlight, straightedge, and angle gauge housed in the drawer 136. The adjustment is repeated until there are no gaps or offsets between the end faces of the two pipes. Start the argon arc welding machine to perform welding, and pay close attention to the condition of the weld joint in real time to ensure that the weld joint is flat and free of defects.

[0047] The beneficial effects of this utility model are as follows: By clamping the pipe with a straightening clamp 6 that provides strong constraint on the pipe in the first, second, and vertical directions, and then using a straightening clamp 7 in conjunction with the straightening clamp 6 to straighten the portion of the pipe's adjacent end face, it helps maintain the vertical orientation of the pipe end face. Fine-tuning the pipe position in three directions through the vertical mechanism 2, radial mechanism 3, and first axial mechanism 4 helps improve the flatness of the two pipe end faces, thereby improving welding quality. The pipe clamp can be used with various pipe specifications, thus giving the welding fixture a wide range of applications. The combination of a screw and a reducer provides high adjustment precision, and the self-locking principle of the bolt and nut helps ensure positional stability and clamping strength.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A pipe clamp, characterized in that, The device includes two opposing grippers (64), which extend along a first horizontal direction and move closer to or further away from each other along a second horizontal direction perpendicular to the first direction. Each gripper (64) includes a rectangular strip-shaped gripper block (641), a ridge (642) connected to the gripper block (641), and gripping teeth (644) connected to the ridge (642). The ridge (642) is formed by a protrusion on the surface of the gripper block (641) near the other gripper block (641). The ridge (642) is a strip-shaped structure with a triangular cross-section and has two inclined ridge surfaces directly connected to the gripper block (641). An abutment groove (643) is formed at one end of the ridge (642) away from the gripper block (641) and connected to the two ridge surfaces. The surface of the ridge (642) is... The surface is raised, forming a plurality of clamping teeth (644) arranged at intervals along the first direction. The clamping teeth (644) connected to the two ridge surfaces correspond one to one. The clamping teeth (644) have an outer tooth surface (645) extending along the second direction and an inner tooth surface (646) connected to the outer tooth surface (645) and the edge of the contact groove (643). The angle of the inner tooth surface (646) matches the ridge surface. The clamping teeth (644) of the two jaws (64) are arranged in a staggered manner. The surface of each inner tooth surface (646) is formed with a flexible friction surface. When the two jaws (64) abut against each other, the contact grooves (643) of the two jaws (64) form a rhomboid cavity extending along the first direction, and the inner tooth surface (646) of each clamping tooth (644) abuts against the ridge surface of the other jaw (64).

2. The pipe clamp as described in claim 1, characterized in that, It also includes a clamping seat (61), a clamping screw (62), and a clamping slider (63). The surface of the clamping seat (61) has a clamping slide rail (611) that extends along the second direction. The clamping screw (62) is rotatably connected to the clamping seat (61), extends along the second direction, and can be controllably rotated along the central axis. The clamping slider (63) is slidably connected to the clamping slide rail (611) and has a threaded hole that penetrates the clamping slider (63) along the second direction. The threaded hole fits into the outer wall of the clamping screw (62). The same clamping screw (62) passes through two oppositely arranged clamping sliders (63), and the two clamping sliders (63) move closer or further away from each other along the second direction synchronously with the rotation of the clamping screw (62). The gripper (64) is connected to the surface of the clamping slider (63), and the friction surface is made of nylon.

3. A welding fixture, characterized in that, The device includes an alignment clamp (6), a straightening clamp (7), and a support frame (1). The alignment clamp (6) and the straightening clamp (7) are pipe clamps as described in claim 1 or 2. The alignment clamp (6) can be controllably clamped or released to clamp the position of the end face of the pipe to be welded adjacent to it. The pipe extends horizontally along a first direction. The alignment clamp (6) can be controllably slid in the first direction and in a second direction that is horizontal and perpendicular to the first direction. Its height is adjustable in the longitudinal direction. The straightening clamp (7) is disposed adjacent to the alignment clamp (6) and can be controllably clamped or released to straighten the portion of the pipe adjacent to the end face together with the alignment clamp (6). The straightening clamp (7) can be controllably slid in the second direction and its height is adjustable in the longitudinal direction. The support frame (1) is used to connect and support the alignment clamp (6) and the straightening clamp (7).

4. The welding fixture as described in claim 3, characterized in that, The straightening clamp (7) slides freely in the first direction.

5. The welding fixture as described in claim 4, characterized in that, It also includes a vertical mechanism (2), a radial mechanism (3), a first axial mechanism (4), and a second axial mechanism (5). The alignment clamp (6) is connected to the first axial mechanism (4), and the straightening clamp (7) is connected to the second axial mechanism (5). The first axial mechanism (4) and the second axial mechanism (5) are both connected to the radial mechanism (3), and each of the radial mechanisms (3) is connected to the vertical mechanism (2). Each of the vertical mechanisms (2) is connected to the support frame (1), including a vertical screw (22) extending in the vertical direction and rotating around its central axis, and a vertical slider (23) that can be controllably moved in the vertical direction with the rotation of the vertical screw (22). The radial mechanism (3) is connected to the vertical slider (23), including a radial screw (32) extending in the second direction and rotating around its central axis, and a radial slider (33) that can be controllably moved in the second direction with the rotation of the radial screw (32). The second axial mechanism (5) includes an axial connection to the radial slider (33). The connecting plate (41) and the axial slider (43) are provided. The surface of the axial connecting plate (41) is formed with an axial slide rail (411) extending along the first direction. The axial slider (43) is slidably connected to the axial slide rail (411) of the second axial mechanism (5). The axial slider (43) of the second axial mechanism (5) slides freely along the axial slide rail (411), and the straightening clamp (7) is supported on the axial slider (43) of the second axial mechanism (5). The first axial mechanism (4) includes... The axial connecting plate (41) and the axial slider (43) are included, as well as an axial screw (42) connected to the axial connecting plate (41) and extending along the first direction, and an axial threaded component sleeved on the axial screw (42) and cooperating with the axial screw (42). The axial threaded component and the axial slider (43) of the first axial mechanism (4) are both connected to the alignment clamp (6). The alignment clamp (6) slides controllably along the first direction as the axial screw (42) rotates.

6. The welding fixture as described in claim 5, characterized in that, The vertical mechanism (2) further includes a vertical reducer (24) and a vertical knob (25). The vertical reducer (24) is connected between the vertical screw (22) and the vertical knob (25). The vertical screw (22) rotates with the rotation of the vertical knob (25). The radial mechanism (3) further includes a radial reducer (34) and a radial knob (35). The radial reducer (34) is connected between the radial screw (32) and the radial knob (35). The radial screw (32) rotates with the rotation of the radial knob (35). The first axial mechanism (4) further includes an axial reducer (44) and an axial knob (45). The axial reducer (44) is connected between the axial screw (42) and the axial knob (45). The axial screw (42) rotates with the rotation of the axial knob (45).

7. The welding fixture as described in claim 6, characterized in that, At least part of the vertical mechanism (2) includes a steering assembly (26) connected between the vertical reducer (24) and the vertical knob (25), such that the central axis of the vertical knob (25) extends in the horizontal direction.

8. The welding fixture as described in claim 4, characterized in that, The support frame (1) includes a base frame (11), a mounting frame (13), and a lifting mechanism (12). The base frame (11) and the mounting frame (13) are both horizontally arranged. The lifting mechanism (12) is connected between the base frame (11) and the mounting frame (13) so that the mounting frame (13) is supported on the base frame (11). The lifting mechanism (12) is used to controllably adjust the distance between the base frame (11) and the mounting frame (13) in the vertical direction. The alignment clamp (6) and the straightening clamp (7) are both connected to the mounting frame (13).

9. The welding fixture as described in claim 8, characterized in that, The mounting bracket (13) carries two sets of oppositely arranged alignment clamps (6) and straightening clamps (7).

10. The welding fixture as described in claim 8, characterized in that, The support frame (1) includes a drawer (136), casters (111), and adjustable feet (112) connected to the support frame (1). A receiving cavity is formed on the support frame (1), and the receiving cavity has an opening facing to the side. The drawer (136) is connected to the receiving cavity. The casters (111) are connected to the bottom of the support frame (1). The adjustable feet (112) are connected to the support frame (1) for controllably adjusting the bottom height of the support frame (1). The support frame (1) is supported by the casters (111) and / or the adjustable feet (112).

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