Welding machine

Abstract

A movable positioning piece and a heating plate are arranged between a first clamp and a second clamp in the axial direction, the heating plate is provided with a first station and a second station, the movable end of the positioning piece is provided with a third station and a fourth station, the third station of the movable end corresponds to the first station of the heating plate, and the fourth station of the movable end corresponds to the second station of the heating plate. The length of the portion, extending out of the first clamp, of the pipe is rapidly determined by adjusting the axial distance between the first clamp and the positioning piece, the movable end leaves the third station, the originally occupied position is vacated, and the heating plate can be arranged on the first station; the axial distance between the end of the pipe clamped by the first clamp and the heating plate is suitable for the heating plate to conduct non-contact heating on the end of the pipe. The positioning piece plays a role of a reference object, operation is easy, accuracy is high, the approximate position of the heating plate can be indicated, and the follow-up position adjusting difficulty of the heating plate is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, and in particular discloses a welding machine. Background Art

[0002] The welding machine disclosed in the existing Japanese patent JP6574590B2 includes two clamping parts arranged opposite to each other, a moving mechanism for fixing the pipe to be welded, a moving mechanism for moving the clamping parts, and a melting heater for heating the end of the pipe. The welding method of the welding machine consists of a melting process, a pressing process, a stretching process and a natural cooling process: the two pipes of the PFA pipe joint to be welded are clamped by two clamping members in a centered state, the clamping members clamp the ends of the pipes, and the positions of the two clamping members at this time are recorded, and then one of the clamping members is controlled to move away so that the ends of the two pipes are aligned and a suitable gap is reserved to place the melting heater; then the melting heater is turned on so that the two pipes are heated and melted in a non-contact state, and then the melting heater is removed, and the moving mechanism is operated so that the movable clamping part is toward the fixed clamping part, the ends of the melted pipes are close to each other and abutted, and the ends of the pipes are fused together.

[0003] During the entire welding operation, the centering position of the two tubes needs to correspond to the position of the heater to achieve non-contact heating of the two tube ends by the heater; in the prior art, on the one hand, the axial position of the heater cannot be quickly indicated, and on the other hand, the length of the tube end passing through the clamping member cannot be quickly and accurately controlled, which makes it impossible to determine the relative position of the tube end and the heater, and the welding effect is poor; if the distance between the tube end and the heater meets the requirements of non-contact heating through multiple adjustments, the welding efficiency is too low and the operation is cumbersome.

[0004] Therefore, it is necessary to improve the structure of the existing welding machine so as to be able to quickly fix the axial position of the heater and quickly and accurately define the length of the end of the pipe to be welded passing through the clamping component. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a welding machine that solves the problems that the prior welding machine cannot quickly axially position the heater and cannot quickly determine the length of the pipe passing through the clamping component, while improving the welding effect and increasing the welding efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A welding machine, comprising:

[0008] main body,

[0009] A first clamp, used for clamping a pipe, and movably arranged on the main body along the axial direction;

[0010] A second clamp, used for clamping another pipe, is movably arranged on the main body along the axial direction; the first clamp and the second clamp are arranged axially opposite to each other;

[0011] A heating plate, movably disposed between the first fixture and the second fixture in an axial direction, having a first station for non-contact heating of the end of the pipe and a second station away from the end of the pipe;

[0012] It also includes a positioning member, the positioning member has a movable end; the movable end has a third station and a fourth station, the third station of the movable end is located between the first fixture and the second fixture in the axial direction, and is closer to the first fixture than the first station of the heating plate;

[0013] When the movable end is located at the third station and the axial distance between the movable end and the first clamp reaches a predetermined value, the protruding length of the end of the pipe to be welded clamped by the first clamp can be limited;

[0014] When the movable end is located at the fourth station, the heating plate can be placed at the first station to heat the ends of the pipe clamped by the first clamp and the second clamp in a non-contact manner.

[0015] In the utility model, the positioning member and the heating plate are both movable structures, wherein the heating plate has a first station and a second station, and the movable end of the positioning member has a third station and a fourth station, the third station of the movable end corresponds to the first station of the heating plate, and the positioning member is closer to the first clamp than the heating plate. Firstly, by adjusting the axial distance between the first clamp and the positioning member, the end of the pipe clamped by the first clamp can use the movable end of the positioning member as a reference to quickly determine the length of the pipe extending out of the first clamp; accordingly, when the movable end leaves the third station, the position originally occupied is vacated, and the heating plate can be placed in the first station, and a certain gap is naturally reserved between the end of the pipe and the heating plate in the first station, and the gap can meet the requirement of non-contact heating of the end of the pipe by the heating plate. In the utility model, the positioning member plays the role of a reference object. On the one hand, it plays the role of indicating the axial position of the heating plate, so as to axially position the heating plate and reduce the difficulty of subsequent position adjustment of the heating plate; on the other hand, the positioning member can limit the length of the pipe passing through the first clamp, that is, by adjusting the axial spacing between the first clamp and the positioning member in advance, it is possible to quickly determine the length of one of the pipes to be welded extending out of the first clamp and meet the non-contact heating requirements of the pipe.

[0016] Preferably, the main body comprises a first shaft and a second shaft which are arranged in parallel and at intervals, and the first clamp and the second clamp pass through the first shaft and the second shaft and can move in the axial direction to ensure the stability of the first clamp and the second clamp when moving in the axial direction;

[0017] The heating plate is rotatably mounted on the first shaft to switch between the first station and the second station, and the positioning member is rotatably mounted on the second shaft through its fixed end to switch the movable end between the third station and the fourth station;

[0018] The positioning member is axially positioned relative to the heating plate through a fixed end, and the positioning member is closer to the first clamp than the heating plate.

[0019] The heating plate and the positioning member are respectively arranged on two different axes, and the space between the first axis and the second axis is reasonably utilized to avoid interference with each other. The difference in the axial distance between the heating plate at the first station and the first clamp and the axial distance between the positioning member at the third station and the first clamp can meet the requirement of non-contact heating. At the same time, the heating plate is switched between the first station and the second station by rotation, and the movable end of the positioning member is switched between the third station and the fourth station by rotation. The connection structure is relatively simple, which is convenient for manual operation and improves the welding efficiency.

[0020] Preferably, when the movable end is located at the third working position, the axial distance between the end surface of the movable end of the positioning member facing the first clamp and the first clamp is L1, and when the heating plate is at the first working position, the axial distance between the end surface of the heating plate facing the first clamp and the first clamp is L2, satisfying the following conditions: 3mm≤L2-L1≤7mm.

[0021] When the movable end of the positioning piece is located at the third station, the end of the tube clamped by the first clamp abuts against the end face of the movable end facing the first clamp, so that the length of the tube extending out of the first clamp can be quickly determined. Therefore, the value of L2-L1 represents the axial spacing between the end of the tube and the heating plate. Through the above axial spacing, the heating plate performs non-contact heating on the end of the tube. The heating distance within the above range can ensure that the heating plate has a better heating effect on the end of the tube and the welding effect is more ideal.

[0022] Preferably, when the movable end is located at the third workstation and the axial spacing between the movable end and the first clamp reaches a predetermined value, the end of the tube clamped by the first clamp can abut against the end surface of the movable end of the positioning member facing the first clamp, thereby limiting its length passing through the first clamp.

[0023] The axial position of the positioning piece is basically determined, and the predetermined value corresponds to the length of the tube passing through the first clamp. The first clamp can be moved axially to adjust the axial gap between the first clamp and the positioning piece, thereby limiting the length of the tube passing through the first clamp. Based on different materials and pipe diameters, the requirements for the length of the tube extending out of the first clamp are different, and the predetermined value will also be different. When processing the same type of pipe, it is only necessary to make the axial spacing between the movable end and the first clamp reach the predetermined value at the beginning, and there is no need to adjust the first clamp later, so as to ensure that the length of each pipe passing through the first clamp is basically the same and meets the welding requirements, which is conducive to improving welding efficiency and welding quality.

[0024] Preferably, the fixed end of the positioning member is rotatably sleeved on the outer circumference of the second shaft and is axially fixed to the second shaft through a fixing member;

[0025] The fixing member includes a fixing clamp seat, at least one spacer ring and a fastener. The fixing clamp seat has a receiving cavity for receiving the spacer ring and the fixed end of the positioning member. The spacer ring is located between the fixed end of the positioning member and the inner wall of the receiving cavity. The second axis passes through the fixing clamp seat, the fixed end of the positioning member and the spacer ring at the same time. One side of the fixing clamp seat has an open opening, and a locking hole is provided on the open opening. The fastener passes through the locking hole to fix the fixing clamp seat on the second axis.

[0026] The fixing seat is used to axially fix the fixed end of the positioning member on the second shaft, prevent the positioning member from forming axial movement, change the axial spacing between it and the first clamp after reaching a preset value, which is beneficial to improve the accuracy of the positioning of the pipe end by the positioning member; the fixing member of the utility model has a simple structure, relies on the fixing clamp seat to be passed through the second shaft, and the fastener locks the open mouth of the fixing clamp seat to fix the fixing clamp seat on the second shaft; at the same time, the accommodating cavity in the fixing clamp seat is used to accommodate and limit the fixed end of the positioning member, and a spacer ring is provided between the fixed end and the inner wall of the accommodating cavity to reduce the friction between the fixed end of the positioning member and the inner wall of the accommodating cavity, so that the positioning member is easier to rotate.

[0027] Preferably, at least one axial side of the fixing clamp seat is provided with an adjustment hole, and the adjustment hole is used for allowing an adjustment screw to penetrate therethrough to tighten against the axial end surface of the spacer ring.

[0028] The adjusting screw is installed in the adjusting hole from outside to inside, and the front end of the adjusting screw passes through the adjusting hole and abuts against the end face of the spacer ring, thereby axially clamping the fixed end of the spacer ring and the positioning member, so that the positioning member cannot form axial displacement.

[0029] Preferably, the positioning member further comprises a limit lever and a blocking piece, wherein the limit lever is rotatably connected to the second shaft, and the blocking piece is arranged at an end of the limit lever away from the second shaft;

[0030] The movable end includes the end of the limit lever away from the second axis and the blocking piece. When the movable end is located at the third station, the end of the pipe clamped in the first fixture can abut against the end surface of the blocking piece facing the first fixture.

[0031] The fixed end of the positioning member is sleeved on the outer circumference of the second shaft, that is, one end of the limit lever is sleeved on the outer circumference of the second shaft, and the movable end of the positioning member includes the other end of the limit lever and a baffle arranged on the end. The baffle and the limit lever are split structures and can be made of different materials to meet their respective usage requirements and improve welding quality.

[0032] Preferably, a protruding nail is fixed to the end of the limit lever, and the protruding nail is spaced apart from the blocking piece.

[0033] The function of the protruding nail is to provide a grip for an operator to thereby operate the limit lever so that the limit lever rotates relative to the second shaft.

[0034] Preferably, the welding machine further comprises a first mounting seat and a first base connected to each other, the first fixture is fixed to the first base via the first mounting seat, and two ends of the first base are movably passed through the first shaft and the second shaft respectively and can be fixed relative to the first shaft and the second shaft; and / or,

[0035] It also includes a second mounting seat and a second base connected to each other, the second fixture is fixed to the second base through the second mounting seat, and two ends of the second base can movably pass through the first axis and the second axis respectively and can be fixed relative to the first axis and the second axis.

[0036] The first mounting seat and the first base ensure that the first clamp moves and is fixed smoothly on the first axis and the second axis, so that the first clamp can be moved to a preset position and then axially fixed, and the axial spacing between the first clamp and the positioning member is always maintained at a preset value, thereby limiting the length of the pipe passing through the first clamp; similarly, the second mounting seat and the second base ensure that the second clamp moves and is fixed smoothly on the first axis and the second axis.

[0037] Preferably, the welding machine further comprises a mobile platform and a mobile motor, wherein the mobile platform movably passes through the first shaft and the second shaft and has a first state of being locked relative to the first shaft and / or the second shaft, and a second state of being unlocked relative to the first shaft and / or the second shaft, and the mobile motor is fixedly arranged on the mobile platform, and an output end thereof is drivingly connected to the second base;

[0038] When the mobile platform is in the unlocked second state, the second base and the second clamp can move synchronously with the mobile platform; when the mobile platform is in the locked first state, the second base and the second clamp can move axially under the action of the output end of the mobile motor.

[0039] By setting up a moving platform and a moving motor, the second fixture can move relative to the first axis and the second axis in a variety of ways, which can be achieved manually or automatically through program-controlled moving motors, thereby meeting various usage requirements during the pipe welding process.

[0040] Preferably, the movable platform comprises a carriage and two axial mounting blocks, both ends of the carriage are respectively fixedly connected to the surfaces of the two axial mounting blocks, and the two axial mounting blocks are respectively movably passed through the first axis and the second axis to improve the stability of the carriage when it moves axially; the movable motor is fixed to a side of the carriage away from the first clamp, and a space is reserved on a side of the carriage facing the first clamp, and the second clamp can be arranged between the carriage and the first clamp and can move in coordination with the carriage.

[0041] Preferably, the output end of the movable motor is connected to a screw, and a screw nut is fixed on the second base. The screw and the screw nut cooperate in transmission so that the second base can move axially relative to the movable platform. The screw and the screw nut can improve the stability and accuracy of the transmission, thereby ensuring that the second clamp moves axially smoothly and accurately reaches the set position.

[0042] Preferably, the screw rod axially passes through a support block fixed on the lower surface of the drag plate and is rotatably connected to the support block. The two ends of the longer screw rod are respectively connected to the drag plate and the second base, which is beneficial to ensure the connection stability of the screw rod and also enables the second base to move axially synchronously with the moving platform when the screw rod does not rotate.

[0043] Preferably, the first clamp comprises a first sub-part connected to the first mounting seat and a second sub-part hinged to the first sub-part, and the first sub-part and the second sub-part can be locked when closed;

[0044] The second clamp comprises a third section connected to the second mounting seat and a fourth section hinged to the third section, and the third section and the fourth section are locked when closed;

[0045] The first clamp has a first fixing portion for clamping the pipe, and the second clamp has a second fixing portion for clamping the pipe. The first fixing portion and the second fixing portion each include two semi-annular fixtures. Semi-annular mounting portions are respectively provided on the inner sides of the first section, the second section, the third section and the fourth section; the semi-annular fixtures are detachably fixed in the corresponding semi-annular mounting portions.

[0046] The first section and the second section can be closed, and the third section and the fourth section can be closed, so that the two semi-annular fixtures are combined into a ring, adapted to and clamped with the outer circumference of the pipe, thereby fixing the pipe, so that the length of the pipe passing through the first clamp and the second clamp remains unchanged, thereby improving the welding quality.

[0047] Preferably, the semi-annular mounting portion is a semi-annular limiting step, and the mounting surface of the semi-annular fixture has a step surface that matches the limiting step; when installing the semi-annular fixture, its step surface is attached to the limiting step to form a fit. The inner diameter of the semi-annular fixture is determined according to the outer diameter of different pipes to adapt to different pipes.

[0048] The welding machine also includes a jig positioning screw and a sealing ring, wherein the jig positioning screw includes a threaded section and a smooth section, and a groove is provided on the outer periphery of the smooth section for installing the sealing ring;

[0049] A threaded hole is provided on the limiting step, and a through hole is provided at the corresponding position of the step surface. The fixture positioning screw can pass through the aligned threaded hole and the through hole, and the threaded section is threadedly matched with the threaded hole. The sealing ring on the outer periphery of the smooth section forms an interference fit with the through hole, thereby fixing the semi-annular fixture to the semi-annular mounting portion, thereby realizing rapid installation and disassembly of the semi-annular fixture.

[0050] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0051] The utility model arranges the positioning member and the heating plate into movable structures, wherein the heating plate has a first station and a second station, and the movable end of the positioning member has a third station and a fourth station, and the third station of the movable end corresponds to the first station of the heating plate, so that the positioning member plays the role of a reference object: on the one hand, the positioning member plays the role of indicating the axial position of the heating plate, so as to axially position the heating plate and reduce the difficulty of subsequent position adjustment of the heating plate; on the other hand, the positioning member can limit the length of the pipe passing through the first clamp, that is, by adjusting the axial spacing between the first clamp and the positioning member in advance, it is possible to quickly determine the length of one of the pipes to be welded extending out of the first clamp, and meet the non-contact heating requirement of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 It is a schematic structural diagram of a welding machine according to an embodiment of the utility model, wherein it shows that a heating plate is located at a first station and a movable end of a positioning member is located at a fourth station.

[0054] Figure 2 for Figure 1 Front view of the welding machine.

[0055] Figure 3 This is another structural schematic diagram of the welding machine according to an embodiment of the utility model (partial structure is not shown), wherein the movable end of the positioning member is located at its third station.

[0056] Figure 4 It is a front side view of the welding machine (the heating plate is not shown).

[0057] Figure 5 This is another structural schematic diagram of the welding machine according to an embodiment of the utility model (the positioning member is not shown), which shows that the heating plate performs non-contact heating on the pipe clamped by the first clamp and the second clamp.

[0058] Figure 6 for Figure 5 Front view of the welding machine in the state (partial structure is not shown).

[0059] Figure 7 It is a structural schematic diagram of a positioning member according to an embodiment of the utility model.

[0060] Figure 8 The exploded structural diagram of the positioning member according to the embodiment of the utility model is shown in FIG.

[0061] Fig. 9 It is a partial cross-sectional schematic diagram of a welding machine according to an embodiment of the utility model.

[0062] Fig.10 It is a schematic structural diagram of the first clamp of an embodiment of the utility model.

[0063] Fig.11 It is a structural schematic diagram of another state of the first clamp of an embodiment of the utility model.

[0064] Fig.12 for Fig.11 Schematic diagram of the cross-section at AA in the figure.

[0065] Description of Reference Numerals

[0066] 10. Main body; 11. Shell; 12. Mounting platform; 13. Control panel; 14. First axis; 15. Second axis; 16. Fixing block;

[0067] 20. First fixture; 21. First tube; 22. First subdivision; 221. Semi-circular mounting portion; 222. Position limiting step; 223. Threaded hole; 224. Fixture positioning screw; 225. Smooth section; 226. Sealing ring; 227. Threaded section; 23. Second subdivision; 24. First fixing portion; 241. Semi-circular fixture; 242. Step surface;

[0068] 30. second clamp; 31. second tube; 32. third subsection; 33. fourth subsection; 34. second fixing portion;

[0069] 40. Heating plate; 41. First station; 42. Second station;

[0070] 50. Positioning member; 51. Movable end; 52. Fixed end; 53. Third station; 54. Fourth station; 55. Fixing member; 551. Fixing clamp seat; 552. Spacer ring; 553. Fastener; 554. Open mouth; 555. Accommodating cavity; 556. Locking hole; 557. Adjustment hole; 56. Limiting lever; 57. Blocking piece; 58. Protruding nail; 581. Stud screw;

[0071] 60. first mounting seat; 61. first connecting portion; 62. second connecting portion;

[0072] 70. first base; 71. first substrate; 72. axial sliding block; 73. locking member; 731. locking screw; 732. handle;

[0073] 80. Second mounting seat;

[0074] 90. Second base; 91. Mobile platform; 911. Drag board; 912. Axial mounting block; 913. Support block; 92. Mobile motor; 921. Screw rod; 93. Screw rod nut. DETAILED DESCRIPTION

[0075] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0076] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] As attached Figure 1 and attached Figure 2 As shown, the welding machine of the embodiment of the utility model includes a main body 10, a first clamp 20, a second clamp 30, a heating plate 40 and a positioning member 50. Among them, the main body 10 provides an installation space for installing the first clamp 20, the second clamp 30, the heating plate 40, the positioning member 50 and other components. Generally, the main body 10 includes a shell 11, a mounting platform 12, a control panel 13 and an electric control module. The first clamp 20 is used to clamp a pipe, and the second clamp 30 is used to clamp another pipe. For the convenience of description, the pipe clamped by the first clamp 20 is called the first pipe 21, and the pipe clamped by the second clamp 30 is called the second pipe 31. The first clamp 20 and the second clamp 30 are both able to move toward or away from each other, so that the ends of the pipes clamped by each are brought together to abut against each other or separated from each other; the first clamp 20 and the second clamp 30 are both installed on the main body 10, and the straight line direction in which the first clamp 20 and the second clamp 30 move toward or away from each other is defined as the axial direction. In some embodiments, a guide rail or a shaft body can be provided to define the axial direction, so that the first clamp 20 and the second clamp 30 move along the guide rail or the shaft body.

[0079] Based on usage requirements, the heating plate 40 and the positioning member 50 are movably arranged between the axial directions of the first clamp 20 and the second clamp 30, wherein the movable heating plate 40 has a first station 41 for non-contact heating of the end of the pipe and a second station 42 away from the end of the pipe, the first station 41 is located between the axial directions of the first clamp 20 and the second clamp 30, and the second station 42 is located inside the shell 11. The positioning member 50 has a movable end 51, and the movable end 51 has a third station 53 and a fourth station 54. The third station 53 is located between the first fixture 20 and the second fixture 30 in the axial direction, and relative to the heating plate 40 at the first station 41, the positioning member 50 at the third station 53 is closer to the first fixture 20, so that when the welding machine is in operation, the positioning member 50 is first used to quickly limit the length of the end of the first tube 21 passing through the first fixture 20, and then based on the passing length of the end of the first tube 21, the second tube 31 on the second fixture 30 is limited, so that the passing length of the end of the second tube 31 is basically the same as the passing length of the end of the first tube 21, and the non-contact heating of the end of the tube by the heating plate 40 is realized. Therefore, it is necessary to use the positioning member 50 to control the first tube 21 on the first fixture 20 to determine the passing length of the end of the first tube 21. Of course, in other embodiments, if the passing length of the end of the second tube 31 is determined first, the third station 53 can be made closer to the second fixture 30.

[0080] It should be noted that, in this embodiment, the movable end 51 of the positioning member 50 has the third station 53 and the fourth station 54 , which does not mean that the movable end 51 has four stations, but is only to distinguish it from the stations of the heating plate 40 to avoid confusion.

[0081] When the movable end 51 is located at the third station 53 and the axial spacing between the movable end 51 and the first clamp 20 reaches a predetermined value, the protruding length of the end of the pipe to be welded clamped by the first clamp 20 can be limited; when the movable end 51 is located at the fourth station 54, the heating plate 40 can be placed in the first station 41 to heat the end of the pipe clamped by the first clamp 20 and the second clamp 30 in a non-contact manner.

[0082] in, Figure 3 The heating plate 40 is not shown in the figure. The position indicated by the mark 42 in the figure is below the installation platform 12 and the internal area of ​​the shell 11, that is, the second position 42 of the heating plate 40 refers to the movement of the heating plate 40 to the internal area of ​​the shell 11 below the installation platform 12.

[0083] Based on the above structure, the operation mode of the welding machine of this embodiment is as follows:

[0084] Step 1: The positioning member 50 and the heating plate 40 are axially fixed between the first fixture 20 and the second fixture 30 respectively, and the movable end 51 of the positioning member 50 is moved to the third station 53, and the heating plate 40 is located at the second station 42, that is, the heating plate 40 is located below the mounting platform 12 and in the inner area of ​​the housing 11;

[0085] Step 2: axially move the first fixture 20 so that the axial distance between the first fixture 20 and the positioning member 50 reaches a predetermined value, such as 30 mm, and fix the first fixture 20 so that its axial position is fixed;

[0086] Step 3: As attached Figure 3 and attached Figure 4 As shown, the end of the first tube 21 is passed through the first clamp 20 until the end of the first tube 21 abuts against the movable end 51 of the positioning member 50, and the first tube 21 is clamped to fix the length of the end of the first tube 21 passing through the first clamp 20;

[0087] Step 4: Then move the movable end 51 of the positioning member 50 to the fourth station 54 to leave a space;

[0088] Step 5: Pass the end of the second tube 31 through the second clamp 30, the length of which is substantially equal to the length of the end of the first tube 21, and clamp the second tube 31; it should be noted that the order of step 4 and step 5 can be interchanged;

[0089] Step 6: axially move the second clamp 30 to make it close to the first clamp 20 until the ends of the first tube 21 and the second tube 31 abut against each other;

[0090] Step 7: Move the second clamp 30 axially again to move it away from the first clamp 20, and separate the ends of the first tube 21 and the second tube 31. This step is controlled by a program, and the program accurately controls the moving distance S1 of the second clamp 30.

[0091] Step 8: As attached Figure 6 As shown, the heating plate 40 is controlled to move to the first station 41, located between the ends of the first tube 21 and the second tube 31, and the heating program is started to perform non-contact heating on the ends of the first tube 21 and the second tube 31. After the heating is completed, the heating plate 40 is controlled to leave the first station 41, so that it moves away from between the ends of the first tube 21 and the second tube 31, and switches to its second station 42, that is, enters the area below the installation platform 12 and inside the shell 11;

[0092] Step nine: Move the second clamp 30 to make it close to the first clamp 20. This step is also controlled by the program. The second clamp 30 moves toward the first clamp 20 by a distance S2, which is greater than S1, so that the ends of the two tubes are close to each other and form axial extrusion and are welded together.

[0093] in, Figure 6 In order to better illustrate that the heating plate 40 heats the ends of the two tubes in a non-contact manner, the fixing bracket of the heating plate is not shown.

[0094] In the present invention, the positioning member 50 and the heating plate 40 are both movable structures, wherein the heating plate 40 has a first station 41 and a second station 42, and the movable end 51 of the positioning member 50 has a third station 53 and a fourth station 54; the third station 53 of the movable end 51 corresponds to the first station 41 of the heating plate 40, and can indicate the axial position of the heating plate 40; at the same time, the positioning member 50 is closer to the first fixture 20 than the heating plate 40, and the axial distance between the first fixture 20 and the positioning member 50 is adjusted so that the first fixture 20 0. The end of the pipe clamped by the first clamp 20 can use the movable end 51 as a reference to quickly determine the length of the pipe extending out of the first clamp 20, thereby determining the axial distance between the end of the pipe and the first station 41 of the heating plate 40; accordingly, when the movable end 51 leaves the third station 53, the position originally occupied is vacated, and the heating plate 40 can be placed in the first station 41, and a certain gap is naturally reserved between the end of the pipe clamped by the first clamp 20 and the heating plate 40 in the first station 41, and the axial gap is suitable for the heating plate 40 to perform non-contact heating on the end of the pipe. The positioning member 50 in the utility model plays the role of a reference. On the one hand, it plays the role of indicating the axial position of the heating plate 40, so as to axially position the heating plate 40 and reduce the difficulty of subsequent position adjustment of the heating plate 40; on the other hand, the positioning member 50 can limit the length of the pipe passing through the first clamp 20, that is, by adjusting the axial spacing between the first clamp 20 and the positioning member 50 in advance, it is possible to quickly determine the length of one of the pipes to be welded extending out of the first clamp 20 and meet the non-contact heating requirements of the pipe.

[0095] As attached Figure 1 As shown, in this embodiment, the main body 10 includes a first axis 14 and a second axis 15 that are arranged in parallel and spaced apart. The axial direction of this embodiment is the extension direction of the first axis 14 and the second axis 15. The main body 10 includes a mounting platform 12, and two fixing blocks 16 are respectively arranged on both axial sides of the mounting platform 12. The two ends of the first axis 14 and the second axis 15 pass through and are fixed in the fixing blocks 16 respectively. The upper surface of the mounting platform 12 is fixed by the fixing blocks 16. The two ends of the first fixture 20 are respectively sleeved on the first axis 14 and the second axis 15. The two ends of the second fixture 30 are respectively sleeved on the first axis 14 and the second axis 15. The first fixture 20 and the second fixture 30 are axially movable and arranged between the fixing blocks 16 at the two axial ends, so as to prevent the first fixture 20 and the second fixture 30 from falling off from the first axis 14 and the second axis 15. The use of two axes also ensures the stability of the first fixture 20 and the second fixture 30 when moving axially.

[0096] As attached Figure 1As shown, the heating plate 40 is rotatably mounted on the first shaft 14 to switch between the first station 41 and the second station 42; the positioning member 50 is rotatably mounted on the second shaft 15, and the heating plate 40 and the positioning member 50 are respectively arranged on two different shafts, so as to reasonably utilize the space of the first shaft 14 and the second shaft 15 to avoid mutual interference. At the same time, the heating plate 40 is switched between the first station 41 and the second station 42 by rotation, and the movable end 51 of the positioning member 50 is switched between the third station 53 and the fourth station 54 by rotation. The connection structure is relatively simple, which is convenient for manual operation and improves the welding efficiency.

[0097] In this embodiment, the end of the positioning member 50 sleeved on the second shaft 15 is called the fixed end 52, and the fixed end 52 is rotatably mounted on the second shaft 15. The movable end 51 is switched between the third station 53 and the fourth station 54 by rotating the fixed end 52. At the same time, the positioning member 50 is axially positioned relative to the heating plate 40 through the fixed end 52, and the positioning member 50 is closer to the first fixture 20 relative to the heating plate 40. Specifically, the movable end 51 of the positioning member 50 is closer to the first fixture 20 relative to the heating plate 40, so as to achieve the heating plate 40 to the ends of the first tube 21 and the second tube 31. In non-contact heating, the positioning member 50 limits the length of the end of the first tube 21 passing through the first fixture 20 in order to reserve a heating gap. Therefore, the positioning member 50 of the third station 53 is closer to the first fixture 20 than the heating plate 40 of the first station 41. Considering the thickness of the positioning member 50 and the movable end 51 itself, the positioning member 50 as a whole is not necessarily closer to the first fixture 20 relative to the heating plate 40. At least part of the positioning member 50, especially the end face of the movable end 51 of the positioning member 50 facing the first fixture 20, is closer to the first fixture 20 than the end face of the heating plate 40 facing the first fixture 20.

[0098] Specifically, as attached Figure 4 As shown in FIG. 1 , when the movable end 51 is located at the third station 53, the axial distance between the end surface of the movable end 51 of the positioning member 50 facing the first fixture 20 and the first fixture 20 is L1, and the end of the first tube 21 passing through the first fixture 20 abuts against the end surface of the movable end 51 facing the first fixture 20; as shown in FIG. Figure 6 As shown, when the heating plate 40 is in the first station 41, the axial spacing between the end surface of the heating plate 40 facing the first fixture 20 and the first fixture 20 is L2; ​​therefore, the value of L2-L1 represents the axial spacing between the end of the tube and the heating plate 40, that is, the heating gap. Through the above axial spacing, the heating plate 40 performs non-contact heating on the end of the tube, and meets the following conditions: the heating gap of 3mm≤L2-L1≤7mm can ensure that the heating plate 40 has a better heating effect on the end of the tube, ensure that the ends of the two tubes are evenly heated, and the welding effect is more ideal.

[0099] As mentioned above, in this embodiment, the way to limit the penetration length of the end of the first tube 21 is to abut the end of the first tube 21 with the movable end 51 of the positioning member 50 toward the end face of the first fixture 20. Before that, it is necessary to adjust the axial spacing between the first fixture 20 and the positioning member 50, such as in step 2 of the above-mentioned welding machine operation method. Specifically, when the movable end 51 is located at the third station 53 and the axial spacing between the movable end 51 and the first fixture 20 reaches a predetermined value, the end of the tube passes through the first fixture 20 and abuts against the movable end 51 of the positioning member 50 toward the end face of the first fixture 20, thereby limiting the length of the end of the tube passing through the first fixture 20. Since the position of the positioning member 50 in the axial direction is basically determined, the aforementioned predetermined value corresponds to the length of the end of the tube passing through the first fixture 20. The axial spacing between the first fixture 20 and the positioning member 50 can be adjusted by axially moving the first fixture 20, thereby limiting the length of the end of the tube passing through the first fixture 20.

[0100] It should be noted that if Figure 4 As shown, the axial spacing between the first clamp 20 and the positioning member 50 here refers to the axial distance between the end face of the part of the first clamp 20 that clamps the first tube 21 facing the second clamp 30 and the end face of the movable end 51 facing the first clamp 20, that is, L1. The preset value range is 20-30mm, that is, the length of the end of the first tube 21 passing through the first clamp 20 is 20-30mm. Similarly, the length of the end of the second tube 31 passing through the second clamp 30 is 20-30mm. Under this length setting, the roundness of the two pipes to be welded is relatively high. After welding is completed, the sealing performance of the weld of the two pipes is reliable and the strength is high. Based on different materials and pipe diameters, the requirements for the length of the pipe extending out of the first clamp 20 are different, and the predetermined value of the axial spacing between the movable end 51 and the first clamp 20 will also be different; when processing the same type of pipe, it is only necessary to make the axial spacing between the movable end 51 and the first clamp 20 reach the predetermined value at the beginning, and there is no need to adjust the first clamp 20 later, so as to ensure that the length of each pipe passing through the first clamp 20 is basically the same and meets the welding requirements, which is conducive to improving welding efficiency and welding quality. In addition, the welding machine can also be used for welding joints, and the length of the joint passing through the corresponding fixed part is adjusted according to the specific size of the joint.

[0101] In addition, as attached Figure 6 As shown, when the heating plate 40 is in the first working position 41, the axial distance between the end face of the heating plate 40 facing the first clamp 20 and the first clamp 20 is L2, which refers to the axial distance between the end face of the heating plate 40 facing the first clamp 20 and the end face of the part of the first clamp 20 that clamps the first tube 21 facing the second clamp 30.

[0102] In order to axially position the positioning member 50 on the second shaft 15, the positioning member 50 is axially fixed to the second shaft 15 by a fixing member 55. Specifically, as shown in the attached Figure 7 and attached Figure 8 As shown, the fixing member 55 includes a fixing clamp seat 551, at least one spacer ring 552 and a fastener 553. The fixing clamp seat 551 has a housing cavity 555 for housing the spacer ring 552 and the fixed end 52 of the positioning member 50. The spacer ring 552 is located between the fixed end 52 of the positioning member 50 and the inner wall of the housing cavity 555. The material of the spacer ring 552 is PTFE, and the friction coefficient is small, which is beneficial to reduce the friction between the axial end face of the fixed end 52 of the positioning member 50 and the inner wall of the housing cavity 555 and the axial end face of the spacer ring 552, so that the fixed end 52 of the positioning member 50 can rotate smoothly; the axial thickness of the spacer ring 552 can also be adjusted so that the total thickness of the spacer ring 552 and the fixed end 52 of the positioning member 50 matches the thickness of the housing cavity 555, thereby improving the stability of the axial position of the fixed end 52 of the positioning member 50 in the housing cavity 555. In this embodiment, the number of the spacer rings 552 is 2, that is, a spacer ring 552 is disposed on each of the two axial end surfaces of the fixed end 52 of the fixing member 50 to further improve the smoothness of the rotation of the fixed end.

[0103] The fixing clamp seat 551, the fixing end 52 and the spacer ring 552 all have cylindrical holes that are compatible with the second shaft 15. The second shaft 15 passes through the fixing clamp seat 551, the fixing end 52 of the positioning member 50 and the spacer ring 552 at the same time. One side of the fixing clamp seat 551 has an open mouth 554, and the open mouth 554 is provided with a locking hole 556. The fastener 553 passes through the locking hole 556 to fix the fixing clamp seat 551 on the second shaft 15.

[0104] As attached Figure 8 As shown, at least one axial side of the fixing clamp seat 551 is provided with an adjustment hole 557, and the adjustment hole 557 is used for the adjustment screw to penetrate and abut against the axial end face of the spacer ring 552. When the difference between the total axial thickness of the fixed end 52 of the positioning member 50 and the spacer ring 552 and the axial thickness of the accommodating cavity 555 is too large, the positioning member 50 cannot form a stable axial positioning relative to the second shaft 15, and the screw can be installed in the adjustment hole 557 from the outside to the inside, and the front end of the screw passes through the adjustment hole 557 and abuts against the axial end face of the spacer ring 552, thereby axially clamping the spacer ring 552 and the fixed end 52 of the positioning member 50, so that the positioning member 50 cannot form an axial displacement; on the other hand, during long-term use, the rotation of the fixed end 52 of the positioning member 50 will wear the abutting surface between the spacer ring 552 and the fixed end 52 of the positioning member 50, thereby causing the axial fixation of the positioning member 50 to loosen or fail, and the adjustment screw can also be adjusted axially to make it abut against the axial end face of the spacer ring 552 again.

[0105] The specific structure of the positioning member 50 can be as shown in the attached Figure 7As shown, it includes a limit lever 56 and a baffle 57. The limit lever 56 is rotatably connected to the second shaft 15, and the baffle 57 is arranged at the end of the limit lever 56 away from the second shaft 15. The fixed end 52 of the positioning member 50 is sleeved on the outer periphery of the second shaft 15, that is, one end of the limit lever 56 is sleeved on the outer periphery of the second shaft 15. The movable end 51 of the positioning member 50 includes the other end of the limit lever 56 and the baffle 57 arranged on the end. When the movable end 51 is located at the third station 53, the end of the pipe clamped in the first clamp 20 can abut against the end face of the baffle 57 facing the first clamp 20. The baffle 57 and the limit lever 56 are a split structure and can be made of different materials. For example, the limit lever 56 is made of metal to increase the service life of the positioning member 50. The material of the baffle 57 can be POM homopolymer. The baffle 57 is used for the end of the pipe to be welded to abut and contact, so as to avoid the introduction of additional metal ions into the welding part of the pipe. The blocking piece 57 is fixed to the end of the limiting blocking rod 56 by means of screws.

[0106] In order to facilitate the rotation of the positioning member 50, the movable end 51 further includes a protruding nail 58, which is arranged at the end of the limit lever 56 provided with the blocking piece 57, and the protruding nail 58 is arranged at a distance from the blocking piece 57, that is, located at the outer periphery of the blocking piece 57. Since the function of the protruding nail 58 is to be grasped by the operator to operate the limit lever 56, the protruding nail 58 has a certain length, and the protruding nail 58 can be protrudingly arranged on the end surface of the limit lever 56 facing the first clamp 20, and can also be protrudingly arranged on the end surface of the limit lever 56 facing the second clamp 30. The protruding nail 58 is fixedly connected to the limit lever 56 by a cylindrical head screw 581.

[0107] Based on the operation mode of the above welding machine, the first clamp 20 and the second clamp 30 both need to be axially moved and fixed relative to the first shaft 14 and the second shaft 15. Figure 1 and attached Fig. 9 As shown, the welding machine of this embodiment also includes a first mounting seat 60 and a first base 70 connected to each other, the first clamp 20 is fixed to the first base 70 through the first mounting seat 60, and the two ends of the first base 70 respectively movably pass through the first axis 14 and the second axis 15, and can be fixed relative to the first axis 14 and the second axis 15; it also includes a second mounting seat 80 and a second base 90 connected to each other, the second clamp 30 is fixed to the second base 90 through the second mounting seat 80, and the two ends of the second base 90 respectively movably pass through the first axis 14 and the second axis 15, and can be fixed relative to the first axis 14 and the second axis 15.

[0108] Of course, in some embodiments, the first clamp 20 can be fixedly connected to the first shaft 14 and the second shaft 15, and only the second clamp 30 can be moved, that is, the axial distance between the first clamp 20 and the positioning member 50 is fixed, and other steps remain unchanged; or, the second clamp 30 can be fixedly connected to the first shaft 14 and the second shaft 15, and only the first clamp 20 can be moved, that is, the penetration distance of the end of the second tube 31 is preferentially determined, and the axial distance between the second clamp 30 and the positioning member 50 is fixed, and other steps remain unchanged.

[0109] The first mounting seat 60 and the first base 70 ensure that the first clamp 20 moves and is fixed smoothly on the first axis 14 and the second axis 15, so that the first clamp 20 can be moved to a preset position and then axially fixed. The axial spacing between the first clamp 20 and the positioning member 50 is always maintained at a preset value, thereby limiting the length of the pipe passing through the first clamp 20; similarly, the second mounting seat 80 and the second base 90 ensure that the second clamp 30 moves and is fixed smoothly on the first axis 14 and the second axis 15.

[0110] The structures of the first mounting seat 60 and the second mounting seat 80 are substantially the same, and the structures of the first base 70 and the second base 90 are substantially the same. The first mounting seat 60 and the first base 70 are taken as examples for explanation below.

[0111] As attached Fig.10 As shown, the first base 70 includes a first substrate 71 and two axial sliding blocks 72 fixed at both ends of the lower surface of the first substrate 71. The two axial sliding blocks 72 are axially movably mounted on the first shaft 14 and the second shaft 15 respectively, driving the first substrate 71 to move axially. The first mounting seat 60 is fixed on the upper surface of the first substrate 71. The first mounting seat 60 includes an integrated first connecting portion 61 and a second connecting portion 62. The first connecting portion 61 is provided with a screw hole, and a corresponding screw hole is provided on the first substrate 71. The screw passes through the two aligned screw holes to fix the first mounting seat 60 on the first substrate 71; the axial cross-section of the first connecting portion 61 and the second connecting portion 62 is L-shaped, and the thickness of the second connecting portion 62 is less than the thickness of the first connecting portion 61. The bottom surface of the first clamp 20 abuts against the upper surface of the second connecting portion 62, and the side surface of the first clamp 20 abuts against the side surface of the first connecting portion 61. At the same time, a screw hole is provided in the area of ​​the bottom of the first clamp 20 corresponding to the first connecting portion 61, and a screw hole is provided on the side surface of the first connecting portion 61. The screw passes through the two aligned screw holes to fix the first clamp 20 on the first mounting seat 60.

[0112] Based on the operation mode of the welding machine, in this embodiment, when the second fixture 30 moves in the axial direction, it is moved manually part of the time and moved under program control part of the time, and the first fixture 20 remains stationary when the axial spacing with the positioning member 50 reaches a preset value, that is, the first fixture 20 is locked relative to the first shaft 14 and the second shaft 15. In this embodiment, the difference between the first base 70 and the second base 90 is that the first base 70 is further provided with a locking member 73, and the first base 70 is fixed relative to the first shaft 14 and the second shaft 15 by the locking member 73. Specifically, the side of the axial sliding block 72 of the first base 70 is provided with a through hole, and the locking member 73 includes a locking screw 731 and a handle 732. The locking screw 731 is inserted into the through hole, and the locking screw 731 is rotated by the handle 732 so that the locking screw 731 is pressed against the first shaft 14 or the second shaft 15, thereby fixing the first base 70 and the first fixture 20 on the first shaft 14 and the second shaft 15. In a specific embodiment, a locking piece 73 can be set on both axial sliding blocks 72 of the first base 70. When the locking piece 73 on either side is pressed against the corresponding outer periphery of the shaft, the first base 70 can be fixed to the first shaft 14 and the second shaft 15, which is convenient for operators on both sides to operate.

[0113] The welding machine also includes a moving platform 91 and a moving motor 92, which together form a moving mechanism. The moving platform 91 is linked to the second base 90 through the moving motor 92, so that the second fixture 30 can move in a variety of ways relative to the first axis 14 and the second axis 15, which can be achieved manually or automatically through program control of the moving motor 92, thereby meeting the various movement requirements of the second fixture 30.

[0114] In this embodiment, the mobile platform 91 movably passes through the first axis 14 and the second axis 15, and has a first state locked relative to the first axis 14 and / or the second axis 15, and a second state unlocked relative to the first axis 14 and / or the second axis 15. The mobile motor 92 is fixed to the mobile platform 91, and its output end is transmission-connected to the second base 90.

[0115] When the mobile platform 91 is in the unlocked second state, the second base 90 and the second clamp 30 can move synchronously with the mobile platform 91, and in this case, the second clamp 30 can generally be manually pushed to achieve its axial movement relative to the first axis 14 and the second axis 15, and this action is convenient and quick to operate manually. For example, when the second tube 31 is just fixed to the second clamp 30, the second clamp 30 is manually pushed so that the end of the second tube 31 abuts against the end of the first tube 21, and then the mobile platform 91 is locked relative to the first axis 14 and the second axis 15. When the mobile platform 91 is in the locked first state, the second base 90 and the second clamp 30 can be axially moved under the action of the output end of the mobile motor 92.

[0116] Specifically, the mobile platform 91 includes a carriage 911 and two axial mounting blocks 912, both ends of the carriage 911 are respectively fixedly connected to the surfaces of the two axial mounting blocks 912, and the two axial mounting blocks 912 are respectively movably passed through the first shaft 14 and the second shaft 15. In this embodiment, at least one of the two axial mounting blocks 912 is provided with a locking member 73 to achieve a first locked state and a second unlocked state of the mobile platform 91 relative to the first shaft 14 or the second shaft 15. The structure of the locking member 73 is as described above, including a locking screw 731 and a handle 732. The side of the axial mounting block 912 is also provided with a through hole. The locking member 73 includes a locking screw 731 and a handle 732. The locking screw 731 is inserted into the through hole. The locking screw 731 is rotated by the handle 732 so that the locking screw 731 is tightly pressed against the first axis 14 or the second axis 15, thereby fixing the movable platform 91 on the first axis 14 and the second axis 15. At this time, if the movable motor 92 is not working, the second base 90 and the second clamp 30 are also fixed on the first axis 14 and the second axis 15. If the movable motor 92 is working, the second base 90 and the second clamp 30 can move axially.

[0117] Of course, in other embodiments, a movable platform 91 and a movable motor 92 may also be provided on the side of the first base 70 away from the second base 90 to realize various axial movement modes of the first clamp 20 . The principle is the same as above. In this case, the locking member 73 may not be provided on the first base 70 .

[0118] In this embodiment, the mobile motor 92 is fixed to the side of the carriage 911 away from the first clamp 20, leaving a space on the side of the carriage 911 close to the first clamp 20. The second clamp 30 can be arranged between the carriage 911 and the first clamp 20 and can move in coordination with the carriage 911.

[0119] The transmission mode between the moving motor 92 and the second base 90 can be a screw rod and a nut. Fig. 9 As shown, the output end of the mobile motor 92 is connected to the screw rod 921. Specifically, the output end of the mobile motor 92 is fixedly connected to the screw rod 921 through a coupling, and a screw nut 93 for the screw rod 921 to pass through is fixed on the second base 90. The screw rod 921 and the screw nut 93 cooperate in transmission, so that the second base 90 can move axially relative to the screw rod 921 and the mobile platform 91. The screw rod 921 and the screw nut 93 can improve the stability and accuracy of the transmission, thereby ensuring that the second clamp 30 moves axially smoothly and accurately reaches the set position.

[0120] On the other hand, the screw rod 921 axially passes through the support block 913 fixed on the lower surface of the drag plate 911, and is rotatably connected to the support block 913 through a bearing. The two ends of the longer screw rod 921 are respectively connected to the drag plate 911 and the second base 90, which is beneficial to ensure the stability of the screw rod 921. When the mobile motor 92 is not working, that is, the screw rod 921 does not rotate, and the mobile platform 91 is in an unlocked state, under the cooperation of the screw rod 921, the support block 913 and the screw nut 93, the second base 90 and the second clamp 30 can synchronously move axially with the mobile platform 91.

[0121] In this embodiment, the structures of the first clamp 20 and the second clamp 30 are basically the same. The first clamp 20 includes a first section 22 connected to the first mounting seat 60 and a second section 23 hinged to the first section 22, and the first section 22 and the second section 23 can be locked after closing; the second clamp 30 includes a third section 32 connected to the second mounting seat 80 and a fourth section 33 hinged to the third section 32, and the third section 32 and the fourth section 33 can be locked after closing. The first clamp 20 has a first fixing portion 24 for clamping the pipe, and the second clamp 30 has a second fixing portion 34 for clamping the pipe. The first fixing portion 24 and the second fixing portion 34 each include two semi-circular fixtures 241. Semi-circular mounting portions 221 are respectively provided inside the first section 22, the second section 23, the third section 32 and the fourth section 33; the semi-circular fixture 241 is detachably fixed in the corresponding semi-circular mounting portion 221.

[0122] The following is a brief introduction using the first clamp 20 as an example. Fig.10 , Attachment Fig.11 and attached Fig.12 As shown, the first fixture 20 includes a first section 22 connected to the first mounting seat 60 and a second section 23 hinged to the first section 22, and the first section 22 and the second section 23 can be locked after closing. The first section 22 and the second section 23 have semi-annular mounting parts 221 arranged opposite to each other, and the first fixing part 24 includes two semi-annular fixtures 241, and the two semi-annular fixtures 241 are respectively detachably fixed to each semi-annular mounting part 221. In addition, in order to facilitate the installation and positioning of the semi-annular fixture 241, the semi-annular mounting part 221 is a semi-annular limiting step 222, and the installation surface of the semi-annular fixture 241 has a step surface 242 matching the limiting step 222. When installing the semi-annular fixture 241, its step surface 242 is attached to the limiting step 222 to form a quick positioning and matching. The inner diameter of the semi-annular fixture 241 is determined according to the outer diameter of different pipes to adapt to pipes with different outer diameters.

[0123] In order to facilitate the rapid installation and disassembly of the semi-annular jig 241, a threaded hole 223 is provided in the corresponding area of ​​the limiting step 222, and a through hole is provided in the area corresponding to the step surface 242 of the semi-annular jig 241. The positions of the threaded hole 223 and the through hole correspond. The jig positioning screw 224 includes a threaded section 227 and a smooth section 225. The outer periphery of the smooth section 225 is provided with a groove for installing a sealing ring 226. The jig positioning screw 224 passes through the through hole, and its threaded section 227 is tightened into the threaded hole 223 of the limiting step 222. The sealing ring 226 on the outer periphery of the smooth section 225 forms an interference fit with the through hole of the semi-annular jig 241, thereby fixing the semi-annular jig 241 to the semi-annular mounting portion 221.

[0124] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A welding machine, comprising: main body; A first clamp, used for clamping a pipe, and movably arranged on the main body along the axial direction; A second clamp, used for clamping another pipe, is movably arranged on the main body along the axial direction; the first clamp and the second clamp are arranged axially opposite to each other; The heating plate is movably arranged between the first fixture and the second fixture in the axial direction, and has a first station for non-contact heating of the end of the pipe and a second station away from the end of the pipe; characterized in that: Also included is a positioning member, the positioning member having a movable end; The movable end has a third station and a fourth station, the third station of the movable end is located between the first fixture and the second fixture in the axial direction, and is closer to the first fixture than the first station of the heating plate; When the movable end is located at the third station and the axial distance between the movable end and the first clamp reaches a predetermined value, the protruding length of the end of the pipe to be welded clamped by the first clamp can be limited; When the movable end is located at the fourth station, the heating plate can be placed at the first station to heat the ends of the pipe clamped by the first clamp and the second clamp in a non-contact manner.

2. The welding machine according to claim 1, characterized in that The main body comprises a first shaft and a second shaft which are arranged in parallel and at an interval, and the first clamp and the second clamp pass through the first shaft and the second shaft and can move in the axial direction; The heating plate is rotatably mounted on the first shaft to switch between the first station and the second station, and the positioning member is rotatably mounted on the second shaft through its fixed end to switch the movable end between the third station and the fourth station; The positioning member is axially positioned relative to the heating plate through a fixed end, and the positioning member is closer to the first clamp than the heating plate.

3. The welding machine according to claim 2, characterized in that When the movable end is located at the third working position, the axial distance between the end surface of the movable end of the positioning member facing the first fixture and the first fixture is L1, and when the heating plate is at the first working position, the axial distance between the end surface of the heating plate facing the first fixture and the first fixture is L2, satisfying the following conditions: 3mm≤L2-L1≤7mm.

4. The welding machine according to claim 1, 2 or 3, characterized in that: When the movable end is located at the third workstation and the axial distance between the movable end and the first clamp reaches a predetermined value, the end of the tube clamped by the first clamp can abut against the end surface of the movable end of the positioning member facing the first clamp, thereby limiting its length passing through the first clamp.

5. The welding machine according to claim 3, characterized in that: The fixed end of the positioning member is rotatably sleeved on the outer circumference of the second shaft and is axially fixed to the second shaft through a fixing member; The fixing member includes a fixing clamp seat, at least one spacer ring and a fastener. The fixing clamp seat has a receiving cavity for receiving the spacer ring and the fixed end of the positioning member. The spacer ring is located between the fixed end of the positioning member and the inner wall of the receiving cavity. The second axis passes through the fixing clamp seat, the fixed end of the positioning member and the spacer ring at the same time. One side of the fixing clamp seat has an open opening, and a locking hole is provided on the open opening. The fastener passes through the locking hole to fix the fixing clamp seat on the second axis.

6. The welding machine according to claim 5, characterized in that An adjustment hole is provided on at least one axial side of the fixing clamp seat, and the adjustment hole is used for an adjustment screw to penetrate therein so as to press against the axial end surface of the spacer ring.

7. The welding machine according to claim 2, characterized in that The positioning member further comprises a limit lever and a blocking piece, wherein the limit lever is rotatably connected to the second shaft, and the blocking piece is arranged at an end of the limit lever away from the second shaft; The movable end includes the end of the limit lever away from the second axis and the blocking piece. When the movable end is located at the third station, the end of the pipe clamped in the first fixture can abut against the end surface of the blocking piece facing the first fixture.

8. The welding machine according to claim 7, characterized in that A protruding nail is also fixed to the end of the limit lever, and the protruding nail is spaced apart from the blocking piece.

9. The welding machine according to claim 2, characterized in that: It also includes a first mounting seat and a first base connected to each other, the first fixture is fixed to the first base through the first mounting seat, and two ends of the first base can movably pass through the first axis and the second axis respectively and can be fixed relative to the first axis and the second axis; and / or, It also includes a second mounting seat and a second base connected to each other, the second fixture is fixed to the second base through the second mounting seat, and two ends of the second base can movably pass through the first axis and the second axis respectively and can be fixed relative to the first axis and the second axis.

10. The welding machine according to claim 9, characterized in that It also includes a moving platform and a moving motor, wherein the moving platform movably passes through the first shaft and the second shaft, and has a first state of being locked relative to the first shaft and / or the second shaft, and a second state of being unlocked relative to the first shaft and / or the second shaft, and the moving motor is fixedly arranged on the moving platform, and an output end thereof is drivingly connected to the second base; When the mobile platform is in the unlocked second state, the second base and the second clamp can move synchronously with the mobile platform; when the mobile platform is in the locked first state, the second base and the second clamp can move axially under the action of the output end of the mobile motor.

11. The welding machine according to claim 10, characterized in that The mobile platform includes a carriage and two axial mounting blocks, both ends of the carriage are fixedly connected to the surfaces of the two axial mounting blocks, the two axial mounting blocks are movably passed through the first axis and the second axis, and the mobile motor is fixed to the side of the carriage away from the first fixture.

12. The welding machine according to claim 11, characterized in that The output end of the mobile motor is connected to a screw, a screw nut is fixed on the second base, and the screw and the screw nut are in transmission cooperation; and / or the screw axially passes through a support block fixed on the lower surface of the carriage, so that the second base can move axially synchronously with the mobile platform.

13. The welding machine according to claim 9, characterized in that The first clamp comprises a first sub-part connected to the first mounting seat and a second sub-part hinged to the first sub-part, and the first sub-part and the second sub-part can be locked when closed; The second clamp comprises a third section connected to the second mounting seat and a fourth section hinged to the third section, and the third section and the fourth section are locked when closed; The first clamp has a first fixing portion for clamping the pipe, and the second clamp has a second fixing portion for clamping the pipe. The first fixing portion and the second fixing portion each include two semi-annular fixtures. Semi-annular mounting portions are respectively provided on the inner sides of the first section, the second section, the third section and the fourth section; the semi-annular fixtures are detachably fixed in the corresponding semi-annular mounting portions.

14. The welding machine according to claim 13, characterized in that The semi-annular mounting portion is a semi-annular limiting step, and the mounting surface of the semi-annular fixture has a step surface matching the limiting step; It also includes a fixture positioning screw and a sealing ring, wherein the fixture positioning screw includes a threaded section and a smooth section, and a groove is provided on the outer periphery of the smooth section for installing the sealing ring; A threaded hole is provided on the limiting step, and a through hole is provided at the corresponding position of the step surface. The fixture positioning screw can pass through the aligned threaded hole and the through hole, and the threaded section is threadedly matched with the threaded hole, and the sealing ring on the outer periphery of the smooth section forms an interference fit with the through hole.

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