Pipe welding machine

Abstract

The utility model discloses a pipe welding machine which comprises a machine box, a heating assembly and at least two clamps, and each clamp is used for clamping a pipe fitting to be welded. The clamp is installed on the top of a machine case through a base and comprises a first split body, a second split body and a third split body, the inner walls of the first split body, the second split body and the third split body are provided with clamping cambered surfaces, one of the first split body, the second split body and the third split body is fixed to the base, and the two ends of the second split body are hinged to the first split body and the third split body respectively. The free end of the third split body and the free end of the first split body can be locked so as to clamp a pipe fitting to be welded. The radial clamping force and the extrusion effect of the clamp on the pipe fitting are relatively dispersed, and meanwhile, the pipe fitting is prevented from being subjected to the clamping force in the same diameter direction, so that the pipe fitting is prevented from being extruded to deform and displace, the pipe fitting is kept at a pre-fixed position, the deformation amount is small, and the cross section of the pipe fitting is close to a standard circle as much as possible; the relative area and the welding area of the two to-be-welded pipe fittings are large enough, so that the welding effect is improved, and the welding strength is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fusion technology, in particular to a pipe welding machine. BACKGROUND

[0002] The prior art CN 106903894A discloses a plastic pipe hot melting welding equipment, which comprises a case, the case has support plates at both ends, a guide shaft is arranged between the support plates, a pipeline fixed clamp and a pipeline movable clamp are arranged on the guide shaft, the pipeline fixed clamp and the pipeline movable clamp are used for clamping the pipeline, a pipeline heating device is movably arranged between the pipeline fixed clamp and the pipeline movable clamp, the end of the pipeline is heated by the pipeline heating device, and then the pipeline movable clamp is moved to fuse the two pipelines together.

[0003] The pipeline fixed clamp and the pipeline movable clamp each comprise two split bodies, one of which is fixed, and the other split body is hinged to the previous split body and can be opened and closed; when installing the pipeline, one split body is opened, the pipeline is placed, and then the two split bodies are fixed.

[0004] However, there are some problems: after the two split bodies of the existing clamp are folded, a standard circle is formed, and for some relatively large pipes, the manufacturing tolerance is large, the pipe cross section is generally a non-standard circle, and when clamped by the two split bodies, the pipe wall of the pipe will be subjected to the relative clamping force of the two split bodies in the diameter direction, thereby causing the pipe to be deformed by clamping, and the pipe may also be radially offset, so that the centers of the two pipes to be welded are offset, thereby causing the side walls of the two pipes to be welded to be radially offset, and finally resulting in insufficient welding area and poor welding effect of the two pipes.

[0005] Therefore, it is necessary to improve the structure of the clamp to solve the problems of deformation of the pipe to be welded by extrusion, radial offset of the pipe wall, and insufficient welding area and poor welding effect caused thereby. UTILITY MODEL CONTENTS

[0006] In view of the deficiencies of the prior art, the utility model aims to provide a pipe welding machine, which solves the problems of deformation of the pipe to be welded by extrusion, radial offset of the pipe wall, and insufficient welding area and poor welding effect caused thereby during welding of the existing pipe welding machine.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] A pipe welding machine comprises a case, a heating assembly and at least two clamps, each of the clamps is used for clamping a pipe to be welded;

[0009] The clamps are installed on the top of the case through the base, and the distance between the clamps is adjustable;

[0010] The heating assembly can be placed between or removed from the two clamps, and when the heating assembly is placed between the two clamps, the end of the pipe can be heated.

[0011] The clamp comprises a first part, a second part and a third part, the inner wall of each part has a clamping arc surface, one of the three parts is fixed to the base, the two ends of the second part are hingedly connected to the first part and the third part respectively, and the free end of the third part can be locked to the free end of the first part to clamp the pipe to be welded.

[0012] The pipe welding machine has the advantages that the clamp adopts a three-part structure, the inner wall of each part has a clamping arc surface, the clamping arc surfaces of the three parts are in contact with the outer wall of the pipe and uniformly apply radial clamping force when the three parts are closed, the pipe is prevented from being deformed and displaced, and the pipe is kept in a fixed position; if the cross section of the pipe is a non-standard circle, the clamping arc surfaces of the inner walls of the three parts are in partial contact with the outer wall of the pipe, the number of parts and clamping arc surfaces is larger than that of the existing two-part clamp, the partial contact area with the outer wall of the pipe is larger, the angle of the radial clamping force is more diverse, the radial clamping force and extrusion of the clamp on the pipe are relatively dispersed, the radial clamping force of each part on the pipe is approximately located at the arc length center of the clamping arc surface, any two arc length centers of the three parts are not located on the same diameter, the direction of the radial clamping force of each part on the pipe is not located on the same diameter, the pipe is prevented from being extruded and deformed, and the pipe is prevented from being extruded and displaced and the pipe wall is partially misaligned in the radial direction, the pipe is kept in a fixed position, the deformation amount is small, and the cross section of the pipe is close to a standard circle; whether the cross section of the pipe is a standard circle or a non-standard circle, the opposite area and the welding area of the cross sections of the two pipes to be welded are large enough, the welding effect is improved, and the welding strength is improved.

[0013] Preferably, the second part is fixed to the base, the clamping arc surfaces of the first part, the second part and the third part correspond to central angles respectively, the central angle corresponding to the clamping arc surface of the first part is A, the central angle corresponding to the clamping arc surface of the second part is B, and the central angle corresponding to the clamping arc surface of the third part is C, B > A, and B > C.

[0014] The second part is fixedly connected with the base as a main part for placing the pipe fitting, so that the stability of the pipe fitting during placement is ensured; and the central angle corresponding to the clamping arc surface of the second part is the largest, and the area of the corresponding clamping arc surface is also the largest, so that the contact area with the pipe fitting is larger, and the pipe fitting can be better supported, so that the pipe fitting can be prevented from being separated from the clamp before the first part and the third part are locked, and the operation convenience is improved.

[0015] Preferably, the central angle corresponding to the clamping arc surface of the first part, the second part and the third part satisfies B = 1.5A-2A and B = 1.5C-2C, so that the area of the clamping arc surface of the second part is about 1.5-2 times the area of the clamping arc surface of the first part and the second part, and after the first part, the second part and the third part are folded, the clamping arc surface is close to a whole circle, so that the area of the clamping arc surface of the second part is large enough to play a good supporting role, and the clamping areas of the first part and the third part are controlled, so that the first part, the third part and the second part all have a large misalignment area, so that the radial clamping force of the three parts on the pipe fitting is as dispersed as possible.

[0016] Preferably, the central angle corresponding to the clamping arc surface of the first part and the third part satisfies 0≤|A-C|≤5°, so that the areas of the clamping arc surfaces of the first part and the third part are also different, on the one hand, the radial clamping force of the clamp on the pipe fitting is further dispersed, and on the other hand, the one with the larger clamping arc surface among the first part and the third part can be directed towards the operator, when the diameter of the pipe fitting is large and it is inconvenient to lift, the pipe fitting can be more conveniently placed into the unfolded clamp from the side and placed on the second part, and then the first part and the third part are folded to realize the locking of the pipe fitting, so that the pipe fitting does not need to be lifted too high, and the operation is more labor-saving and efficient.

[0017] Preferably, the heights of the two ends of the second part in the direction perpendicular to the base are different, and the lower end of the second part can be directed towards the operator, so that the pipe fitting can enter from the lower end of the second part and be placed on the second part without being lifted too high.

[0018] Preferably, when the first part, the second part and the third part are concentrically arranged, a circumferentially extending gap is left between adjacent parts; the concentric arrangement of the three parts means that the three parts are initially folded, the clamping arc surfaces form a standard circle, if the cross section of the pipe fitting is a standard circle, the clamping arc surfaces of the three parts are in contact with the outer wall of the pipe fitting, and the gap between adjacent parts does not change, that is, the final folding is completed; if the cross section of the pipe fitting is a non-standard circle, the locking state of the three parts can be further adjusted, so that the gap between adjacent parts changes, the outer contour of the pipe body is adapted, and the contact area of each clamping arc surface with the outer wall of the pipe fitting is larger, so that the pipe fitting is further clamped but the radial clamping force is relatively dispersed.

[0019] Preferably, a first gap is formed between the second part and the first part, a second gap is formed between the second part and the third part, and a third gap is formed between the first part and the third part, the circumferential width of the third gap being greater than the circumferential width of the first gap, and the circumferential width of the third gap being greater than the circumferential width of the second gap. That is, the gaps between the first part and the second part and between the third part and the second part are small, ensuring the tightness of the connection of the first part, the third part and the second part, and enabling the pipe body to be wrapped more tightly from bottom to top, while the gap between the first part and the third part is large, the adjustable range of locking is larger, and the clamping force on the pipe with a non-standard circular cross-section can be adjusted, taking into account the pipe clamping and deformation prevention effects.

[0020] Preferably, the pipe welding machine further comprises first, second and third inner liners corresponding to the first, second and third parts respectively, the inner walls of the first, second and third inner liners forming arc-shaped clamping surfaces respectively; the first, second and third inner liners are concentrically arranged with gaps between adjacent ones.

[0021] For some small-diameter pipes, the diameter of the three parts after folding is not suitable for the pipe, and the clamping arc surface cannot be in contact with the pipe. Therefore, inner liners are arranged in the three parts, and the clamping inner diameter of the three inner liners after folding is suitable for the outer diameter of the pipe, and the pipe is clamped by the clamping surface of the inner wall of the inner liner. The clamping effect is equivalent to that of the clamping arc surface. The radial clamping force and extrusion effect of the clamp on the pipe are relatively dispersed, avoiding the deformation of the pipe due to extrusion, and also avoiding the displacement of the pipe due to extrusion, and the partial radial misalignment of the pipe wall, thereby improving the welding effect and increasing the welding strength. Similarly, after the three parts are folded, gaps are still left between the corresponding inner liners, and the inner liners can be adjusted slightly with the corresponding parts to avoid further clamping between the three parts.

[0022] Preferably, a plurality of convex ribs are arranged on the clamping surface of the first, second and third inner liners in an axial direction, and each convex rib extends in a radial direction. The convex ribs make the clamping surface form a concave-convex surface, which can increase the friction between each inner liner and the outer wall of the pipe to clamp the pipe more stably and avoid pipe slippage.

[0023] Preferably, the outer wall of the first inner liner, the second inner liner and the third inner liner is respectively provided with a circumferentially extending protrusion, the inner wall of the first part, the second part and the third part is respectively provided with a circumferentially extending slot, and the protrusion and the slot are insertedly matched. The circumferential size of the protrusion is matched with the circumferential size of the slot. In the installation, the protrusion is inserted into the slot to realize axial limiting, that is, the inner liner and the corresponding part are not movable in the axial direction, and the pipe clamped by the inner liner is also prevented from moving in the axial direction, so that the pipe welding machine can accurately control the heating distance and the moving distance; and the insertion manner enables the operator to quickly replace the inner liner to adapt to pipe joints of different diameters, thereby improving the work efficiency.

[0024] Preferably, the inner wall of the first inner liner, the second inner liner and the third inner liner is distributed with a clamping section and a avoiding section in the axial direction, the clamping section is protrudingly arranged at the axial one side edge of the inner wall, the clamping surface is located on the clamping section, and the inner diameter of the clamping section is smaller than the inner diameter of the avoiding section. The clamping section is used to clamp the outer wall of the pipe, and the avoiding section is used to avoid the step on the outer wall of the pipe, so as to ensure that the clamping section is flatly attached to the outer wall of the pipe for clamping. The axis of the area of the pipe clamped by the clamping section is substantially coincided with the axis of the clamp, the relative area of the two pipe ends to be welded is larger, the welding area is larger, and the welding effect is better.

[0025] Preferably, at least one circumferential end of the side wall of the first inner liner, the second inner liner and the third inner liner close to the clamping section is provided with a tongue, and the tongue extends in the circumferential direction to shield the gap between the adjacent inner liners. The pipe welding machine of the present application heats the end of the pipe by the heating assembly. Therefore, for the clamp close to the heating assembly, the tongue is arranged to shield the gap between the adjacent inner liners, so as to avoid the heat loss through the gap, and improve the heating efficiency of the heating assembly on the end of the pipe.

[0026] Preferably, the first inner liner, the second inner liner and the third inner liner are respectively assembled on the inner side of the first part, the second part and the third part by magnetic attraction. The present application combines insertion and magnetic attraction assembly, limits the axial movement of the inner liner by the protrusion and slot, and limits the circumferential and radial movement of the inner liner by magnetic attraction, so as to realize all-around fixation of the inner liner. At the same time, the connection mode of magnetic attraction is simple, and the operator can very conveniently take down or install the inner liner from the part, thereby improving the operation efficiency.

[0027] Preferably, the inner walls of the first part, the second part and the third part are distributed with clamping sections and avoiding sections in the axial direction, the clamping sections are protrudingly arranged at the axial one side edges of the inner walls, the clamping curved surfaces are located on the clamping sections, and the inner diameter of the clamping section is smaller than that of the avoiding section.For some parts without inner lining, the clamping curved surfaces on the parts directly contact with the outer wall of the pipe, the clamping sections are used for clamping the outer wall of the pipe, and the avoiding sections are used for avoiding the protruding parts such as steps on the outer wall of the pipe; and for some parts with inner lining, the clamping sections and the avoiding sections can also form slots for limiting the inner lining by cooperating with the bosses on the outer wall of the inner lining.

[0028] In summary, compared with the prior art, the utility model has at least the following beneficial effects:

[0029] The pipe welding machine, wherein the clamp adopts a three-section part structure, includes a first part, a second part and a third part, and the inner walls of the three parts have clamping curved surfaces, the clamping curved surfaces are used for applying clamping force to the outer wall of the pipe, and the pipe is clamped in the middle when the three parts are folded; if the cross section of the pipe is a standard circle, the clamping curved surfaces of the three parts are in close contact with the outer wall of the pipe and uniformly apply radial clamping force, so that the pipe is prevented from being deformed and displaced, and thus the pipe is kept at a previously fixed position; if the cross section of the pipe is a non-standard circle, the clamping curved surfaces of the inner walls of the three parts are in partial contact with the outer wall of the pipe, compared with the existing two-part clamp, the number of parts and clamping curved surfaces of the present application is larger, the partial contact area with the outer wall of the pipe is larger, and the angle of the radial clamping force is more diverse, so that the radial clamping force and the extrusion effect of the clamp on the pipe are relatively dispersed, and the radial clamping force of each part on the pipe is approximately located at the arc length center of the clamping curved surface, any two arc length centers of the three parts are not on the same diameter, therefore, the direction of the radial clamping force of each of the three parts on the pipe will not fall on the same diameter, so that the pipe is prevented from being extruded and deformed, and the pipe is also prevented from being extruded and displaced, and the pipe wall is partially radially misaligned, so that the pipe is kept at a previously fixed position, the deformation amount is small, and the cross section of the pipe is as close to a standard circle as possible; thus, no matter whether the cross section of the pipe is a standard circle or a non-standard circle, the facing area and the welding area of the cross sections of the two pipes to be welded are large enough, and thus the welding effect is improved, and the welding strength is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0031] Figure 1 Structure diagram of pipe welding machine of the embodiment of the utility model.

[0032] Figure 2 Structure diagram of clamp of the embodiment of the utility model.

[0033] Figure 3 For Figure 2 Another state diagram of the clamp of the embodiment, specifically three split state of folding.

[0034] Figure 4 For Figure 2 Another angle structure diagram of the clamp of the embodiment.

[0035] Figure 5 Structure diagram of clamp of another embodiment of the utility model.

[0036] Figure 6 Structure diagram of inner lining of the embodiment of the utility model.

[0037] Figure 7 For Figure 6 Another angle diagram of the inner lining of the embodiment.

[0038] Figure 8 Structure diagram of inner lining of another embodiment of the utility model.

[0039] Figure 9 For Figure 8 Another angle diagram of the inner lining of the embodiment.

[0040] Explanation of reference signs

[0041] 1, case; 2, base; 3, heating assembly;

[0042] 4, clamp; 41, clamping camber; 42, clamping surface; 43, operating piece; 44, pull buckle; 45, detent portion; 46, magnet; 47, iron block; 5, pipe fitting;

[0043] 10, first split body; 11, first inner lining; 12, first gap; 13, convex rib; 14, clamping section; 15, avoiding section; 16, tab; 17, boss; 18, insertion slot;

[0044] 20, second split body; 21, second inner lining; 22, second gap;

[0045] 30, third split body; 31, third inner lining; 32, third gap. Specific implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] As attached Figure 1 As shown, the pipe welding machine of this embodiment includes a housing 1, a heating assembly 3, and at least two clamps 4. Each clamp 4 is used to clamp a pipe fitting 5 to be welded. The housing 1 is used to house electrical and control equipment and provides a mounting platform for components such as the heating assembly 3 and clamps 4. The clamps 4 are mounted on the top of the housing 1 via a base 2. In this embodiment, the axis refers to the line connecting the clamping centers of the multiple clamps 4. The purpose is to maximize the area formed by the facing ends of the pipe fittings 5 ​​clamped by each clamp 4, thereby maximizing the welding area and ensuring welding strength. The spacing between the clamps 4 is adjustable, meaning that the clamps 4 can be moved closer or further apart relative to each other via the base 2. Generally, the moving direction of the clamps 4 is basically coincident with the axis direction, but it is possible that the clamps 4 are offset from the base 2 at a certain angle, resulting in an angle between the moving direction of the clamps 4 and the axis direction.

[0050] The heating component 3 is movably connected to the housing 1 and can be inserted into or removed between the two clamps 4. When the heating component 3 is inserted between the two clamps 4, it can heat the end of the pipe 5. The specific heating method can be contact heating or non-contact heating, which is not limited here. In some application scenarios, non-contact heating is preferred.

[0051] As shown in the accompanying drawings Figure 2 to the accompanying drawings Figure 4 The pipe welding machine, wherein the clamp 4 comprises a first part 10, a second part 20 and a third part 30 with clamping curved surfaces 41 on the inner walls, i.e. the clamp 4 adopts a three-part structure; one of the first part 10, the second part 20 and the third part 30 is fixed to the base 2, the two ends of the second part 20 are hingedly connected to the first part 10 and the third part 30 respectively, and the free end of the third part 30 can be locked to the free end of the first part 10 to clamp the pipe 5 to be welded.

[0052] The embodiment only limits the shape of the inner walls of the first part 10, the second part 20 and the third part 30, and does not limit the shape of the outer walls, so the user can design the specific structure of the first part 10, the second part 20 and the third part 30 according to the actual use scene, as long as the inner walls have clamping curved surfaces 41; and the clamping curved surfaces 41 are used to apply clamping force to the outer wall of the pipe 5.

[0053] Based on the prior art, the cross section of the pipe 5 is generally circular or close to circular, so in the embodiment, the radii of the clamping curved surfaces 41 of the three parts are basically equal, as shown in the accompanying drawings Figure 3 After the first part 10, the second part 20 and the third part 30 of the embodiment are folded, each clamping curved surface 41 forms part of a cylindrical surface, and the three parts clamp the pipe 5 therebetween; if the cross section of the pipe 5 is a standard circle, the clamping curved surfaces 41 of the three parts are in contact with the outer wall of the pipe 5 and uniformly apply radial clamping force, avoiding deformation and displacement of the pipe 5, so that the pipe is kept in a pre-fixed position; if the cross section of the pipe 5 is a non-standard circle, the clamping curved surfaces 41 of the inner walls of the three parts are in partial contact with the outer wall of the pipe 5; compared with the prior art clamp 4 with two parts, the number of parts and clamping curved surfaces 41 of the present application is larger, the partial contact area with the outer wall of the pipe 5 is larger, and the angle of the radial clamping force is more diverse, so that the radial clamping force and extrusion of the clamp 4 on the pipe 5 are relatively dispersed, and the radial clamping force of each part on the pipe is approximately located at the center of the arc length of the clamping curved surface, and any two arc length centers of the three parts are not on the same diameter, so the direction of the radial clamping force of each part on the pipe does not fall on the same diameter, avoiding extrusion and deformation of the pipe 5, and also avoiding displacement of the pipe 5, so that the pipe 5 is kept in a pre-fixed position with small deformation and the cross section of the pipe 5 is close to a standard circle; based on the above clamp, whether the cross section of the pipe is a standard circle or a non-standard circle, the opposite area and the welding area of the cross sections of the two pipes to be welded are large enough, thereby improving the welding effect and improving the welding strength.

[0054] As Figure 1As shown, in the embodiment, the second part 20 is fixed with the base 2, and the bottom of the second part 20 is fixed on the base 2 by welding or screwing or the like, so as to ensure the stability of the whole clamp 4; meanwhile, the second part 20 is the main part for placing the pipe 5, and most of the second part 20 is located below the pipe, so as to ensure the stability of the pipe 5 when placed.

[0055] As shown in the drawings, Figure 3 As shown, the clamping arc surfaces 41 of the first part 10, the second part 20 and the third part 30 correspond to central angles respectively, the central angle corresponding to the clamping arc surface 41 of the first part 10 is A, the central angle corresponding to the clamping arc surface 41 of the second part 20 is B, and the central angle corresponding to the clamping arc surface 41 of the third part 30 is C, B>A and B>C, that is, the central angle corresponding to the clamping arc surface 41 of the second part 20 is greater than the central angles corresponding to the clamping arc surfaces 41 of the first part 10 and the third part 30; therefore, the area of the clamping arc surface 41 of the second part 20 is also the largest, and thus the contact area with the pipe 5 is larger, which can better hold the pipe 5 and make it more convenient for the operator to fold the first part 10 and the third part 30.

[0056] Specifically, the central angles corresponding to the clamping arc surfaces 41 of the first part 10, the second part 20 and the third part 30 satisfy B=1.5A-2A and B=1.5C-2C, and after the first part 10, the second part 20 and the third part 30 are folded, the three clamping arc surfaces 41 form an arc surface close to a whole circle; based on the corresponding relationship of the central angles, the angle range of the central angle A corresponding to the clamping arc surface 41 of the second part 20 is between 150° and 180°, so that the clamping arc surface 41 of the second part 20 is close to a semi-cylindrical surface, the clamping surface 42 is large enough, and plays a good supporting role; if B>2A and B>2C, although the area of the clamping arc surface 41 of the second part 20 can be increased, the opening formed by the first part 10 and the third part 30 is too small, and the central angle corresponding to the second part exceeds 180°, which is not convenient for the pipe 5 to be placed in the second part 20; if B<1.5A and B<1.5C, the circumference of the clamping arc surface 41 of the second part 20 is too small, and the pipe 5 cannot be stably supported, and the pipe 5 is easy to roll on the second part 20, which is not convenient for the first part 10 and the third part 30 to be folded.

[0057] Preferably, the central angles corresponding to the clamping arc surfaces 41 of the first part 10 and the third part 30 satisfy 0≤|A-C|≤5°.

[0058] Thus, the clamping arc surfaces 41 of the first part 10 and the third part 30 are also different in area, which on the one hand further disperses the radial clamping force of the clamp 4 on the pipe 5, and on the other hand, the one with the larger clamping arc surface 41 among the first part 10 and the third part 30 can be directed towards the operator, and the opening towards the operator is larger, and when the pipe 5 is large in diameter and inconvenient to lift, the pipe 5 can be more conveniently placed into the unfolded clamp 4 from the side and placed on the second part 20, and then the first part 10 and the third part 30 are folded to realize locking of the pipe 5. The above operation does not need to lift the pipe 5 very high, and is more labor-saving and efficient.

[0059] Specifically, as shown in the embodiment, Figure 3 the clamping arc surfaces 41 of the first part 10 and the third part 30 can be equal in size; in other embodiments, the clamping arc surface 41 of the first part 10 can be smaller than the clamping arc surface 41 of the third part 30, and correspondingly, the overall size of the first part 10 is also smaller than the overall size of the third part 30; in some other embodiments, the clamping arc surface 41 of the third part 30 can be smaller than the clamping arc surface 41 of the first part 10, and correspondingly, the overall size of the third part 30 is also smaller than the overall size of the first part 10.

[0060] As a preferred, the heights of the two ends of the second part 20 in the direction perpendicular to the base 2 are different, and in actual use, as shown in Figure 1 the lower end of the second part 20 is directed towards the operator, and the operator can place the pipe 5 into the second part 20 from the lower end without lifting it too high, which is more convenient to operate.

[0061] The above embodiments can be combined, for example, in one embodiment, the first part 10 with the larger clamping arc surface 41 is connected to the lower end of the second part 20, which further expands the opening size; or in another embodiment, as shown in Figure 4 the clamping arc surfaces 41 of the first part 10 and the third part 30 connected to the two ends of the second part 20 are comparable in size, and the locking positions of the first part 10 and the third part 30 are relatively close to the operator, which is convenient for locking.

[0062] As shown in Figure 3As shown, the first part 10, the second part 20 and the third part 30 are concentrically arranged, and a circumferentially extending gap is left between adjacent parts. The concentric arrangement of the three parts means that the three parts are preliminarily closed, and the clamping arc surfaces 41 form a standard circle, and the three parts do not interfere with each other. If the cross section of the pipe 5 is a standard circle, the clamping arc surfaces 41 of the three parts are in contact with the outer wall of the pipe 5, and the gap between adjacent parts does not change, i.e. the final closing is completed. If the cross section of the pipe 5 is a non-standard circle, the closing of the clamp 4 can be divided into two steps, i.e. preliminary closing and final closing. In the preliminary closing, the first part 10, the second part 20 and the third part 30 are concentrically arranged, and the outer wall of the pipe 5 with a non-standard circle is less contacted, and then the first part 10 and the third part 30 are further locked, so that the gap between adjacent parts changes, adapts to the outer contour of the pipe body, realizes the final closing, and makes the contact area of each clamping arc surface 41 with the outer wall of the pipe 5 larger, increases the clamping effect of the clamped pipe 5, and still keeps the radial clamping force relatively dispersed.

[0063] As shown in Figure 3 The first gap 12 is formed between the second part 20 and the first part 10, the second gap 22 is formed between the second part 20 and the third part 30, and the third gap 32 is formed between the first part 10 and the third part 30. The circumferential width of the third gap 32 is greater than the circumferential width of the first gap 12, and the circumferential width of the third gap 32 is greater than the circumferential width of the second gap 22. That is, the gap between the first part 10 and the second part 20 and the gap between the third part 30 and the second part 20 are small, which ensures the connection tightness of the first part 10, the third part 30 and the second part 20, and can more tightly wrap the pipe body from bottom to top. At the same time, the gap between the first part 10 and the third part 30 is large, and the adjustable range of locking is large, which can adjust the clamping force of the pipe 5 with a non-standard cross section, and take into account the pipe 5 clamping and anti-deformation effects.

[0064] In a specific embodiment, the circumferential width of the first gap 12 and the second gap 22 is 2mm, and the circumferential width of the third gap 32 is 3mm. Of course, in some embodiments, the circumferential width of the first gap 12 and the second gap 22 is not equal, but is smaller than the circumferential width of the third gap 32.

[0065] As shown in Figure 2 and Figure 3As shown, the first part 10 and the third part 30 are locked by a locking mechanism, the locking mechanism comprises an operating member 43 pivotally mounted on the end of the first part 10 away from the second part 20, a puller 44 pivotally mounted on the operating member 43, and a clamping portion 45 provided on the end of the third part 30 away from the second part 20, the puller 44 can rotate relative to the operating member 43 and can move along with the operating member 43, when the three parts are folded, the operating member 43 drives the first part 10 to rotate towards the third part 30, and at the same time, the third part 30 is driven to rotate towards the first part 10, then the puller 44 on the operating member 43 is pulled to move towards the clamping portion 45 on the third part 30, and the end of the puller 44 is buckled on the clamping portion 45, so that the third part 30 is pulled, and the opposite ends of the first part 10 and the third part 30 are close to each other and clamped, and the pipe is clamped stably. The clamping portion 45 can be a screw, a round rod or a bolt.

[0066] Based on the adjustable gap between the three parts, the locking mechanism can also adjust the locking degree to adapt to the pipe. Specifically, the operating member 43 is long strip-shaped, one end of which is rotatably connected to the outside of the first part 10, one end of the puller 44 is rotatably connected to the front end of the operating member 43, and the other end can be clamped with the clamping portion 45, when the operating member 43 is rotated downward, the one end of the puller 44 is also moved downward, thus the other end of the puller 44 moves the clamping portion 45 towards the first part 10, that is, the third part 30 moves towards the first part 10, the third gap 32 between the first part 10 and the third part 30 becomes smaller, the first gap 12 and the second gap 22 are deformed, and the three parts clamp the pipe 5.

[0067] For some small-diameter pipe 5, the diameter of the three parts after being folded is not suitable for the pipe 5, and the clamping arc surface 41 cannot contact the pipe 5, as preferred, Figure 5 As shown, the pipe welding machine further comprises a first inner liner 11, a second inner liner 21 and a third inner liner 31 corresponding to the first part 10, the second part 20 and the third part 30 respectively, the inner walls of the first inner liner 11, the second inner liner 21 and the third inner liner 31 form arc-shaped clamping surfaces 42 respectively, the clamping inner diameters of the three inner liners are suitable for the outer diameter of the pipe 5 after the three parts are folded, at the same time, each clamping surface 42 clamps the pipe 5, and the clamping effect is equivalent to that of the clamping arc surface 41, and has the same clamping effect, and is more suitable for small-size pipe 5. Similarly, after the three parts are folded, there is still a gap between the corresponding inner liners, the inner liners can be adjusted slightly along with the corresponding parts to avoid interference with the further clamping of the three parts.

[0068] As shown in the accompanying Figure 1As shown, the pipe welding machine has four clamps 4, with two clamps 4 forming a group to create two clamp groups. When the heating component 3 heats the pipe fitting 5, the two clamp groups are located on opposite sides of the heating component 3. With the heating component 3 as a reference, one clamp 4 in the same clamp group is relatively close to the heating component 3 and is used to clamp the front end of the pipe fitting 5, while the other clamp 4 is relatively far from the heating component 3 and is used to clamp the rear end of the pipe fitting 5, thereby ensuring that the end of the pipe fitting 5 is parallel to the axis. In some embodiments, four identical clamps 4 can be used. In other embodiments, clamps 4 clamping different positions of the pipe fitting 5 can be distinguished.

[0069] In practical use, if the outer wall of the pipe fitting 5 is a smooth arc surface, then the clamping surfaces 42 of the corresponding clamping fixture 4, consisting of the first inner liner 11, the second inner liner 21, and the third inner liner 31, are axially spaced with multiple protruding ribs 13, such as... Figure 5 As shown, each protruding ridge 13 extends radially, and the protruding ridge 13 makes the clamping surface 42 form a concave-convex surface, which can increase the friction between each liner and the outer wall of the pipe 5, so as to clamp the pipe 5 more firmly and prevent the pipe 5 from slipping. When the outer wall of the pipe 5 clamped by the two clamps is a smooth arc surface, the liner with this structure can be used in both clamping sets.

[0070] If the outer wall of the pipe fitting 5 has a protruding part, such as a step, then the clamp 4 corresponding to the step uses a first inner liner 11, a second inner liner 21, and a third inner liner 31 with clamping sections 14 and clearance sections 15 distributed axially along the inner walls. Figure 8 As shown, the clamping section 14 protrudes from the axial side edge of the inner wall, and the clamping surface 42 is located on the clamping section 14, that is, the protruding ridge 13 is located in the clamping section 14. The inner diameter of the clamping section 14 is smaller than the inner diameter of the clearance section 15. The function of the clamping section 14 is to clamp the outer wall of the pipe fitting 5, while the function of the clearance section 15 is to avoid the steps for some pipe fittings 5 ​​with steps on the outer wall, ensuring that the clamping section 14 is flat and fits snugly against the outer wall of the pipe fitting 5. The axis of the area where the pipe fitting 5 is clamped is basically coincident with the axis of the clamp 4. The relative area of ​​the ends of the two pipe fittings 5 ​​to be welded is large, the welding area is larger, and the welding effect is better.

[0071] As attached Figure 1 In the illustrated embodiment, when the heating assembly 3 is placed between the two clamp sets to heat the pipe 5, because there are gaps between adjacent parts and between adjacent inner linings, heat dissipates along the gaps away from the heating assembly 3 when the heating assembly 3 heats the end of the pipe 5. To solve this problem, the clamp 4 near the heating assembly 3 is equipped with a... Figure 8 and Figure 9The inner liner of the structure, i.e. the first inner liner 11, the second inner liner 21 and the third inner liner 31, is provided with a tongue 16 near at least one circumferential end of the side wall of the clamping section 14, the tongue 16 extending circumferentially to cover the gap between the adjacent parts, the adjacent inner liners, to prevent heat loss through the gap and improve the heating efficiency of the heating assembly 3 on the end of the pipe 5.

[0072] In some embodiments, each inner liner and the corresponding part can be an integral structure or non-detachable connection. In order to improve the versatility of each size of pipe 5, as preferred, the inner liner and the part are detachably connected.

[0073] Specifically, as shown in the drawings, Figure 4 to Figure 9 The outer wall of the first inner liner 11, the second inner liner 21 and the third inner liner 31 is respectively provided with a circumferentially extending boss 17, and the inner wall of the first part 10, the second part 20 and the third part 30 is respectively provided with a circumferentially extending slot 18, and the boss 17 and the slot 18 are inserted and matched. The circumferential size of the boss 17 is matched with the circumferential size of the slot 18, and in the installation, the boss 17 is inserted into the slot 18 to achieve axial limiting, i.e. each inner liner and the corresponding part are not movable in the axial direction, and the pipe 5 clamped by the inner liner is also prevented from moving in the axial direction, so that the pipe welding machine can accurately control the heating distance and the moving distance; and the insertion mode enables the operator to quickly replace the inner liner to adapt to pipes 5 of different diameters, thereby improving work efficiency.

[0074] In order to facilitate insertion, the circumferential size of the boss 17 is equivalent to the circumferential size of the clamping arc surface 41, and the circumferential two ends of the slot 18 are in an open state, so that the boss 17 can be inserted from above the slot 18 or slid into the slot 18 from the openings at the circumferential two ends.

[0075] More preferably, as shown in the drawings, Figure 5 The first inner liner 11, the second inner liner 21 and the third inner liner 31 are respectively assembled on the inner side of the first part 10, the second part 20 and the third part 30 by magnetic attraction. The present application combines insertion and magnetic assembly to limit the axial movement of the inner liner by the boss 17 and the slot 18, and at the same time limits the circumferential and radial movement of the inner liner by magnetic attraction, thereby achieving all-round fixation of the inner liner; at the same time, the connection mode of magnetic attraction is simple, and the operator can very conveniently take down or put on the inner liner from the part, thereby improving the operation efficiency.

[0076] The outer circumferential arc length midpoint of each inner liner is provided with an iron block 47, and the inner circumferential arc length midpoint of each part is provided with a magnet 46, the magnet 46 generates an attractive action on the iron block 47, and the adsorption force of the magnet and the iron block 47 located at the arc length midpoint can act on the entire inner liner, thereby achieving radial fixation of the inner liner, so that when the pipe 5 is disassembled, the inner liner will not come off.

[0077] In some embodiments, as shown in the drawings, Figure 4As shown, the inner walls of the first part 10, the second part 20 and the third part 30 are axially distributed with clamping sections 14 and avoiding sections 15, the clamping sections 14 are protrudingly arranged at the axial one side edges of the inner walls, the clamping curved surfaces 41 are located on the clamping sections 14, and the inner diameters of the clamping sections 14 are smaller than the inner diameters of the avoiding sections 15. When no inner liner is arranged, the clamping curved surfaces 41 on the parts are directly in contact with the outer wall of the pipe fitting 5, the clamping sections 14 are used for clamping the outer wall of the pipe fitting 5, and the avoiding sections 15 are used for avoiding the protruding positions on the outer wall of the pipe fitting 5, such as steps; and for some parts with inner liner, the clamping sections 14 and the avoiding sections 15 can also form the insertion slots 18 for limiting the inner liner in cooperation with the bosses 17 on the outer wall of the inner liner. Specifically, the insertion slots 18 are arranged at one side of the clamping sections, form a part of the avoiding sections 15, and the radius of the bottom surface of the insertion slot 18 is greater than the corresponding radius of the inner wall of the avoiding section 15, so as to ensure the axial limitation of the inner liner.

[0078] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A pipe welding machine, comprising a housing, a heating assembly, and at least two clamps, each clamp being used to clamp a pipe fitting to be welded; The clamps are mounted on the top of the chassis via a base, and the spacing between the clamps is adjustable. The heating component can be inserted into or removed between the two clamps; when the heating component is inserted between the two clamps, it can heat the end of the pipe fitting; characterized in that... The clamp includes a first part, a second part, and a third part with clamping arc surfaces on their inner walls. One of the three parts is fixed to the base. The two ends of the second part are hinged to the first part and the third part, respectively. The free end of the third part can be locked to the free end of the first part to clamp the pipe to be welded.

2. The pipe welding machine as described in claim 1, characterized in that, The second part is fixed to the base. The clamping arc surfaces of the first part, the second part, and the third part are respectively equipped with central angles. The central angle corresponding to the clamping arc surface of the first part is A, the central angle corresponding to the clamping arc surface of the second part is B, and the central angle corresponding to the clamping arc surface of the third part is C, where B > A and B > C.

3. The pipe welding machine as described in claim 2, characterized in that, The central angles corresponding to the clamping arc surfaces of the first and third parts satisfy 0 ≤ |AC| ≤ 5°; and / or, The central angles corresponding to the clamping arc surfaces of the first, second, and third parts satisfy B = 1.5A ~ 2A and B = 1.5C ~ 2C.

4. The pipe welding machine as described in claim 2, characterized in that, The two ends of the second part are at different heights in the direction perpendicular to the base; and / or, when the first part, the second part and the third part are arranged concentrically, there is a circumferentially extending gap between adjacent parts.

5. The pipe welding machine as described in claim 4, characterized in that, A first gap is formed between the second component and the first component, a second gap is formed between the second component and the third component, and a third gap is formed between the first component and the third component. The circumferential width of the third gap is greater than the circumferential width of the first gap, and the circumferential width of the third gap is greater than the circumferential width of the second gap.

6. The pipe welding machine as described in claim 1, characterized in that, It also includes a first inner liner, a second inner liner, and a third inner liner corresponding to the first part, the second part, and the third part, respectively, and the inner walls of the first inner liner, the second inner liner, and the third inner liner respectively form arc-shaped clamping surfaces; The first liner, the second liner, and the third liner are arranged concentrically, with gaps between adjacent liner.

7. The pipe welding machine as described in claim 6, characterized in that, The clamping surfaces of the first inner liner, the second inner liner, and the third inner liner are provided with a plurality of convex ridges spaced axially, each of the convex ridges extending radially; and / or, the outer walls of the first inner liner, the second inner liner, and the third inner liner are respectively provided with circumferentially extending bosses, and the inner walls of the first split body, the second split body, and the third split body are respectively provided with circumferentially extending slots, the bosses and the slots being inserted into each other.

8. The pipe welding machine as described in claim 6, characterized in that, The inner walls of the first inner liner, the second inner liner, and the third inner liner are provided with clamping sections and clearance sections along the axial direction. The clamping sections protrude from one side edge of the inner wall, the clamping surface is located on the clamping section, and the inner diameter of the clamping section is smaller than the inner diameter of the clearance section. And / or, The first liner, the second liner, and the third liner have a tongue at at least one circumferential end near the sidewall of the clamping section, the tongue extending circumferentially to cover the gap between adjacent liners.

9. The pipe welding machine as described in claim 6, characterized in that, The first inner liner, the second inner liner, and the third inner liner are respectively magnetically attached to the inner sides of the first component, the second component, and the third component.

10. The pipe welding machine as described in claim 1, characterized in that, The inner walls of the first, second, and third parts are provided with clamping sections and clearance sections along the axial direction. The clamping sections protrude from the axial side edge of the inner wall, the clamping arc surface is located on the clamping sections, and the inner diameter of the clamping sections is smaller than the inner diameter of the clearance sections.

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