Electric heating fusion welding machine for thermal insulation pipeline joint

Abstract

The invention relates to the technical field of thermal insulation pipe hot melting welding, and particularly provides an electric hot melting welding machine for a thermal insulation pipeline joint. Comprising a hot melting welding machine and a welding auxiliary frame matched with the hot melting welding machine. Two circular rail frames; the two rotating rings are coaxially and rotatably mounted on the two circular rail frames in a one-to-one correspondence manner; the compression roller mechanism comprises four driving assemblies; a plurality of compression roller pieces are horizontally and rotationally mounted between the two driving assemblies at opposite positions on the two rotating rings; the two fastening mechanisms are assembled on the two circular rail frames in a one-to-one correspondence manner; the two groups of hot-air blowers are assembled on the two rotating rings in a one-to-one correspondence manner; the welding auxiliary frame matched with the hot melting welding machine is provided, the welding auxiliary frame has high integration, various operations before and after hot melting welding of the outer protective layer of the heat preservation pipe are met, operation is convenient and fast, standardization and normalization of welding operation of the heat preservation pipe can be improved, and the quality uniformity is improved while the welding forming quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation pipe hot-melt welding, and particularly provides an electric hot-melt welding machine for thermal insulation pipe joints. Background Art

[0002] Insulated pipes are pipe products with thermal insulation functions. They are mainly used to transport high-temperature or low-temperature media (such as hot water, steam, cold air, oil, natural gas, etc.). They achieve energy conservation and consumption reduction by reducing the heat or cold loss of the media during transportation.

[0003] Insulated pipes are generally composed of a medium pipe, an insulation layer and an outer protective layer distributed from the inside to the outside. For insulated pipes whose medium pipes are thermoplastic plastics or whose outer protective layers are thermoplastic plastics, electric hot melt welding is suitable for butt-jointing the joints of two insulated pipes. Compared with hot melt welding between medium pipes, the hot melt welding process between outer protective layers is more complicated and has higher requirements.

[0004] Under the existing technology, when the outer sheath of the insulation pipe is heat-melted, a heat-melt sleeve is used to overlap the two ends of the outer sheath of the insulation pipe, and the two overlaps need to be tightened externally in turn. In order to improve the stability of the heat-melt sleeve, it is usually necessary to further clamp the position between the two ends of the heat-melt sleeve manually, and then perform heat-melt welding on the basis of tightening and fixing. After the heat-melt welding is completed, it is necessary to further process the two ends of the heat-melt sleeve and the overlap joint thereof with heat shrink tape to improve the overall sealing of the heat-melt sleeve after welding. The above operations basically rely on manual labor. The operation is manual and the tools are scattered. In addition, when the heat shrink tape is heated, a non-open flame heating device such as a hot air blower is basically used to heat the heat shrink tape around the tape. This is not convenient for manual operation and is single-point heating. The heat is unevenly distributed around the circumference of the heat shrink tape, which affects the quality of the heat shrink seal. In addition, the heating speed of the heat shrink tape is also inconvenient to control manually. In summary, under the existing technology, in the process of hot-melt welding the outer sheath of the insulation pipe, the operation has problems such as lack of unification, standardization and normalization, which affects the welding molding quality and the sealing quality, and increases the probability of rework after sealing detection. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides an electric hot-melt welding machine for thermal insulation pipe joints, which is used to solve the problems mentioned in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: an electric hot-melt welding machine for heat-insulated pipe joints, comprising a hot-melt welding machine and a welding auxiliary frame matched therewith, wherein the welding auxiliary frame comprises: an adjusting base; two circular rail frames, which are arranged horizontally and coaxially relative to each other and mounted on the adjusting base; the circular rail frames are in a structure of being split in half along the vertical direction; the adjusting base can drive the two circular rail frames to synchronously split and separate and move relative to each other in the axial direction; two rotating rings, which are coaxially rotated and mounted on the two circular rail frames in a one-to-one correspondence; the rotating rings are in a structure of being split in half; a pressure roller mechanism, comprising four four halves mounted in a one-to-one correspondence on the two rotating rings. A drive assembly on the disconnect structure; multiple pressure rollers are installed horizontally and rotatably between the two drive assemblies in relative positions on the two rotating rings, and all the pressure rollers are distributed along the circumference of the rotating ring; under the common drive of the two drive assemblies, multiple pressure rollers are used to adjust the distance between the pressure rollers and the center of the rotating ring in a synchronized manner; the pressure rollers are in an axially contracted structure; two fastening mechanisms are mounted on the two circular rail frames in a one-to-one manner, for correspondingly fastening the two hot melt joint ends of the insulation pipe; and two groups of hot air blowers are mounted on the two rotating rings in a one-to-one manner; multiple hot air blowers in each group are fixed on the rotating ring in a circumferential distribution, and the air outlets of the hot air blowers are arranged toward the center of the rotating ring.

[0007] Preferably, the adjustment base includes a base plate, on which two guide rails are installed for horizontal relative sliding movement; two circular rail frames are mounted on the two guide rails in a one-to-one correspondence, and two half-broken structures in the circular rail frames are mounted on the guide rails for relative sliding movement along a direction perpendicular to the sliding direction of the guide rails; a double-headed telescopic rod is installed between the two half-broken structures in the two circular rail frames that are in their axial relative positions, and the double-headed telescopic rod is fixed on the half-broken structures of the two circular rail frames through two telescopic ends.

[0008] Preferably, the driving assembly includes an arc-shaped plate that is coaxially arranged and rotationally driven and installed on a rotating ring; a plurality of slide rails are fixed along the circumferential direction on the half-split structure of the rotating ring, and sliding blocks are slidably installed on the plurality of slide rails, and a connecting rod is hinged between each sliding block and the arc-shaped plate; a pressure roller is horizontally installed between two sliding blocks that are located in relative positions in the axial direction of the rotating ring.

[0009] Preferably, the pressure roller assembly includes two pressure rollers that are horizontally symmetrically arranged and rotatably mounted on two sliding blocks in a one-to-one correspondence. The two pressure rollers are elastically connected and a spline shaft is installed in a sliding fit therebetween.

[0010] Preferably, the fastening mechanism includes a guide frame fixed on one of the half-broken structures in the circular rail frame, the guide frame is equipped with a tightening frame that can be moved and adjusted toward the center of the rotating ring, the tightening frame is equipped with a tightening belt that provides tightening adjustment, and one end of the tightening belt is detachably arranged on the tightening frame.

[0011] Preferably, the tightening frame includes a roller frame slidably mounted on the guide frame, and a winding roller is horizontally rotatably mounted on the roller frame; one end of the fastening belt is fixed on the winding roller, and the other end is fixed to the belt shaft; a bayonet is provided on the roller frame, and the belt shaft is buckled at the bayonet.

[0012] Preferably, the pressing roller is a stepped circular roller structure consisting of two circular roller segments with different diameters, and the circular roller segment with the larger diameter is arranged close to the sliding block.

[0013] Preferably, a gear ring is provided on the rotating ring.

[0014] Preferably, the air outlet end of the hot air blower is equipped with a flattened air outlet cover with a rectangular structure, and the long side of the flattened air outlet cover is arranged axially along the rotating ring.

[0015] The above technical solution has the following advantages or beneficial effects: the present invention provides an electric hot-melt welding machine for insulated pipe joints, which is equipped with a welding auxiliary frame that matches the existing hot-melt welding machine, and can be specifically designed for the front and back operations of hot-melt welding of the outer sheath of the insulated pipe. The circular rail frame and the rotating ring in the welding auxiliary frame both adopt a disconnected structure design to facilitate the taking and placing of the insulated pipe. The circular rail frame is equipped with a fastening mechanism that can be operated in an avoidable position to facilitate the tightening operation of the two hot-melt ports of the hot-melt sleeve; an adjustable pressure roller mechanism is installed between the rotating rings to provide evenly distributed external clamping support for the outside of the hot-melt sleeve, and cooperates with the fastening mechanism to ensure the stability of the hot-melt sleeve overlap, and can The hot melt area is rolled and shaped for easy operation; in the heating and sealing link of the heat shrinkable tape, the evenly dispersed hot air blower and the pressure roller are driven by the rotating ring to automatically rotate around the heat shrinkable tape, which can ensure the uniformity of circumferential heat distribution of the heat shrinkable tape, so as to facilitate uniform shrinkage, and the synchronous rolling operation of the pressure roller improves the tightness of the fit between the shrinkable tape and the hot melt sleeve; in summary, the welding auxiliary frame provided in the present invention is highly integrated, meets various operations before and after the hot melt welding of the outer protective layer of the insulation pipe, is easy to operate, can improve the standardization and standardization of the insulation pipe welding operation, while ensuring the quality of welding forming, improves the uniformity of quality, and avoids rework operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention and its features, configurations and advantages will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings, in which like reference numerals indicate like parts throughout the drawings, which are not drawn to scale, with emphasis placed on illustrating the subject matter of the present invention.

[0017] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of an electric hot-melt welding machine for heat-insulated pipe joints.

[0018] Figure 2 It is a three-dimensional structural diagram of the welding auxiliary frame.

[0019] Figure 3 It is a side view of the welding auxiliary frame.

[0020] Figure 4 It is a three-dimensional structural diagram of the assembly of the circular rail frame and the adjustment base.

[0021] Figure 5 It is a three-dimensional structural diagram of two half-broken structures in relative positions in two rotating rings, a set of pressure rollers and two drive components.

[0022] Figure 6 It is a three-dimensional structural diagram of a set of pressure roller parts and two drive components.

[0023] Figure 7 It is a three-dimensional structural diagram of the half-split structure of the circular rail frame, the half-split structure of the rotating ring, and the assembly of the fastening mechanism.

[0024] Figure 8 yes Figure 7 A partial enlarged view of point A in the middle.

[0025] Figure 9 This is a working state diagram of the hot melt welding machine when performing hot melt welding on the insulation pipe.

[0026] Figure 10 This is a three-dimensional structural diagram of two insulation pipes after hot-melt welding and heat sealing with heat shrink tape.

[0027] In the figure: 1. Adjustment base; 11. Bottom plate; 12. Guide rail; 13. Double-ended telescopic rod; 131. Bushing block; 132. Spline rod; 14. Bidirectional lead screw; 2. Circular rail frame; 21. Circular guide rail; 22. Bottom foot; 3. Rotating ring; 31. Ring gear; 32. Rotating part; 33. Radial plate; 4. Press roller mechanism; 41. Drive assembly; 411. Electric push rod; 412. Arc plate; 413. Slide rail; 414. Sliding block; 415. Connecting rod. 42. Pressure roller; 421. Pressure roller; 422. Spline shaft; 423. Tension spring; 5. Fastening mechanism; 51. Guide frame; 52. Roller frame; 521. Bayonet; 522. Screw; 53. Winding roller; 54. Transition roller; 55. Fastening belt; 56. Belt shaft; 6. Hot air blower; 61. Flattened air hood; 7. Hot melt welding machine; 81. Insulation pipe; 811. Medium pipe; 812. Insulation layer; 813. Outer protective layer; 82. Hot melt sleeve; 83. Heat shrink tape. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 、 Figure 3 and Figure 9 As shown, an electric hot-melt welding machine for insulated pipe joints includes a hot-melt welder 7 and a corresponding welding auxiliary frame. In the present invention, with the assistance of the welding auxiliary frame, the hot-melt welder 7 primarily welds the outer sheath 813 when two insulated pipes 81 are butt-jointed. The hot-melt welder 7 is a conventional welding machine for performing electric hot-melt welding. From the inside out, the insulated pipe 81 comprises, in order, a dielectric pipe 811, an insulating layer 812, and an outer sheath 813. The insulating layer 812 is typically a polyurethane foam layer or other insulating filler layer, while the outer sheath 813 is typically made of thermoplastic plastic.

[0031] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the welding auxiliary frame includes an adjusting base 1; the adjusting base 1 includes a base plate 11, and in order to facilitate movement, the bottom of the base plate 11 can be equipped with universal wheels; two guide rails 12 are installed on the base plate 11 for horizontal relative sliding; the two guide rails 12 are correspondingly equipped with a circular rail frame 2, the circular rail frame 2 includes a circular guide rail 21 and a base 22 welded on the circular guide rail 21, the two circular rail frames 2 are horizontally coaxially symmetrically arranged, and the base 22 is slidably installed on the guide rail 12, in order to facilitate the completion of the welded insulation pipe 81 to be hoisted and removed from the welding auxiliary frame, the circular rail frame 2 is a half-broken structure in the vertical direction, and the guide rail 12 plays an assembly guiding role for the two half-broken structures of the circular rail frame 2, and the sliding direction of the circular rail frame 2 on the guide rail 12 is perpendicular to the sliding direction of the guide rail 12 on the base plate 11.

[0032] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a double-ended telescopic rod 13 is assembled between the two half-disconnected structures located in the axially relative positions of the two circular rail frames 2. The double-ended telescopic rod 13 includes a shaft sleeve block 131 and two spline rods 132. Two symmetrically arranged shaft sleeves are provided in the shaft sleeve tube. The two spline rods 132 are correspondingly slidably assembled in the two shaft sleeves of the shaft sleeve block 131 by key matching. One end of the two spline rods 132 is fixed to the base 22 by bolts. In order to realize the synchronous disconnection and separation operation of the two circular rail frames 2, a double-ended telescopic rod 13 is horizontally rotatably mounted on the base plate 11 through two bearings with seats. The bidirectional screw 14 and the sleeve blocks 131 of the two double-headed telescopic rods 13 are threadedly mounted on the two threaded segments of the bidirectional screw 14 in a one-to-one manner. In this embodiment, the bidirectional screw 14 is preferably driven by a motor, and manual rotation can be selected as an option. In addition, in order to adjust the spacing between the two circular rail frames 2, the two screws can be rotatably mounted on the base through the bearing seat, and the two screws are threadedly mounted on the two guide rails 12 in a one-to-one manner. In actual operation, the adjustment range of the spacing between the two circular rail frames 2 is small, so the screw can be manually rotated for adjustment.

[0033] like Figure 4 、 Figure 5 and Figure 7 As shown, the two circular rail frames 2 are respectively equipped with a rotating ring 3, and both ends of the rotating ring 3 are provided with a rotating part 32 which is arranged concentrically therewith and is in a circular ring structure. The rotating ring 3 is installed on the circular guide rail 21 through the coaxial rotation of the rotating part 32 at one end. In order to cooperate with the structure of the circular rail frame 2, the rotating ring 3 is a half-broken structure as a whole. When the circular rail frame 2 needs to be disconnected and separated, the rotating ring 3 needs to be rotated and adjusted first so that the two half-broken structures of the rotating ring 3 are independently distributed on the two half-broken structures of the circular rail frame 2 in a one-to-one correspondence. Subsequently, the two double-headed telescopic rods 13 can be driven by the bidirectional screw 14 to disconnect and separate the circular rail frame 2, and the rotating ring 3 is also disconnected and separated. A ring gear 31 is provided on the rotating ring 3. In order to realize the synchronous rotation drive of the two rotating rings 3, a driving motor (not shown in the figure) can be fixedly installed on the half-disconnected structure on the same side of the two circular rail frames 2, and a gear meshing with the ring gear 31 is fixed on the output shaft of the driving motor. The two driving motors maintain synchronous control. Multi-motor synchronous control is an existing technology and will not be described in detail here. When the circular rail frame 2 is in a non-disconnected state, the two rotating rings 3 maintain synchronous rotation on the circular guide rail 21 through synchronous drive by the two driving motors.

[0034] like Figure 2 、 Figure 3 、 Figure 5 and Figure 6As shown, a pressure roller mechanism 4 that rotates synchronously therewith is installed between the two rotating rings 3; the pressure roller mechanism 4 includes four drive components 41 that are mounted one-to-one on the four half-split structures of the two rotating rings 3; the drive component 41 includes an electric push rod 411, an arc plate 412, four slide rails 413, four sliding blocks 414 and four connecting rods 415, the arc plate 412 is distributed at both axial ends of the rotating ring 3 relative to the circular guide rail 21, and the arc plate 412 is coaxially arranged and rotatably installed on the rotating part 32 at one end of the rotating ring 3; the electric push rod 411 is hinged on the half-split structure of the rotating ring 3, and the output end of the electric push rod 411 is hinged on the arc plate 412; eight circumferentially evenly distributed push rods are welded on the rotating ring 3. The radial plates 33 are arranged in a circular pattern, and four radial plates 33 are distributed on the two half-broken structures of the rotating ring 3; the four slide rails 413 are fixed on the corresponding four radial plates 33 by bolts, and the four sliding blocks 414 are slidably installed on the four slide rails 413 in a one-to-one manner, and the sliding blocks 414 slide radially along the rotating ring 3 in the slide rails 413; one end of the four connecting rods 415 is hinged on the four sliding blocks 414 in a one-to-one manner, and the other ends of the four connecting rods 415 are hinged on the arc plate 412; a pressure roller 42 is horizontally installed between the two sliding blocks 414 that are in relative positions in the axial direction of the rotating ring 3, and there are eight pressure rollers 42 in total, and the eight pressure rollers 42 are evenly distributed on the circumference of the rotating ring 3. The pressure roller assembly 42 includes two pressure rollers 421 that are horizontally symmetrically arranged and rotatably mounted on two sliding blocks 414 in a one-to-one manner. The pressure rollers 421 are tubular structures with one end open. A spline shaft 422 is installed between the two pressure rollers 421 for sliding cooperation through a key, and a tension spring 423 is welded between the two pressure rollers 421. In order to cooperate with the subsequent shrinkage and edge pressing operation of the shrinkage belt, the pressure roller 421 is a stepped circular roller structure composed of two circular roller segments with different diameters, and the circular roller segment with a larger diameter is arranged close to the sliding block 414. The radius difference between the two circular roller segments on the pressure roller 421 is slightly smaller than the thickness of the shrinkage belt.

[0035] Starting the electric push rod 411 can drive the arc plate 412 to rotate along the rotating part 32, and then push the sliding block 414 to slide along the slide rail 413 through the connecting rod 415, so that the distance between the pressure roller 42 and the center of the rotating ring 3 can be adjusted; the pressure roller 42 adopts a telescopic structure design, so that it can cooperate with the two circular rail frames 2 to adjust the width.

[0036] like Figure 2 、 Figure 7 and Figure 8As shown, before hot-melt welding, in order to overlap and tie the two ends of the hot-melt sleeve 82 to the ends of the outer sheath 813 of the two insulation pipes 81, the two circular rail frames 2 are respectively equipped with a fastening mechanism 5 on the half-broken structure on the same side; the fastening mechanism 5 includes a guide frame 51 welded to the half-broken structure of the circular guide rail 21, and the guide frame 51 is arranged close to the upper broken end of the circular guide rail 21; a roller frame 52 is vertically slidably mounted on the guide frame 51, and a screw 522 is vertically rotated on the top of the roller frame 52 through a bearing, and the screw 52 2 is threadedly mounted on the guide frame 51; a winding roller 53 and a transition roller 54 are horizontally rotatably mounted on the roller frame 52; one end of the fastening belt 55 is glued and fixed to the winding roller 53, and the fastening belt 55 passes around the transition roller 54, and the other end is glued to the belt shaft 56; an L-shaped bayonet 521 is provided on the roller frame 52. In this embodiment, the belt shaft 56 is a circular shaft structure with a radius equal to that of the transition roller 54, and both ends of the belt shaft 56 are provided with a clamping shaft with a square shaft structure that cooperates with the bayonet 521. The belt shaft 56 is buckled at the bayonet 521 through the clamping shaft. In this embodiment, in order to facilitate direct manual feeling of the force when the fastening belt 55 is tightened, the winding roller 53 can be wound by manual rotation, and a locking nut can be threadedly installed on the rotating shaft of the winding roller 53, so that after the fastening belt 55 is tightened, it is tightened on the roller frame 52 through the nut, thereby indirectly locking the winding roller 53. Of course, other methods can be selected to achieve the locking of the winding roller 53, such as using the combination of a positioning pin and a positioning hole.

[0037] like Figure 2 、 Figure 3 、 Figure 5 and Figure 7 As shown, in order to facilitate uniform heating treatment of the heat shrinkable tape 83, four hot air blowers 6 are correspondingly installed on the two rotating rings 3, and the four hot air blowers 6 are evenly distributed circumferentially; and the air outlet of the hot air blower 6 is set toward the center of the rotating ring 3. In order to ensure the covering and heating effect in the width direction of the heat shrinkable tape 83, the air outlet end of the hot air blower 6 is equipped with a flattened air outlet hood 61 with a rectangular structure, and the long side of the flattened air outlet hood 61 is set along the axial direction of the rotating ring 3. It should be noted that, in the present invention, the hot air blower 6 is only equipped with a resistance wire for providing a heat source. Each hot air blower 6 is provided with an air inlet, and is also equipped with a blower for unified air supply on the outside (not shown in the figure). Specifically, the two rotating rings 3 can be equipped with a blower through a fixed frame so that the blower can rotate with the rotating ring 3. The air outlet end of the blower can be connected to the air pipe, and the air pipe can be further connected to the air inlets of the four hot air blowers 6 through four branch pipes. The air is blown by the blower and discharged by heating with the help of the resistance wire. The exhaust temperature can be controlled by the resistance wire. During actual construction, the hot air temperature can cause the heat shrinkable tape 83 to shrink and deform.

[0038] The present invention provides an electric hot melt welding machine for heat-insulated pipe joints. When the heat-insulated pipe 81 is butt-jointed, the welding auxiliary frame mainly cooperates with the hot melt welding machine 7 to complete the hot melt welding of the outer sheath 813. Figures 1 to 10 The specific process is as follows.

[0039] Before welding, the welding auxiliary frame is placed on the ground, and the circular rail frame 2 is adjusted to the disconnected state. Then, the insulation pipe 81 that needs to be connected is hoisted to the welding operation area through the hoisting equipment. The insulation pipe 81 can be placed horizontally on the positioning support frame, and the ends of the two insulation pipes 81 to be connected are located between the two half-broken structures of the circular rail frame 2. Here, the positioning support frame is a tooling frame specially used to support and position the insulation pipe 81, and the tooling frame can adjust the placement height of the insulation pipe 81. During the installation process, it is necessary to adjust the height of the insulation pipe 81 through the positioning support frame, and the position of the welding auxiliary frame needs to be adjusted so that the insulation pipe 81 is basically in the middle position of the two half-broken structures in the circular track frame 2, and the central axis of the insulation pipe 81 is at the same height position as the half-broken structure of the circular track frame 2; then, the overlapping section of the outer protective layer 813 of the two insulation pipes 81 is cleaned to remove impurities such as oil, dust and the like on the surface; then, the circular track frame 2 is reset to the assembled state through the adjustment of the bidirectional screw 14.

[0040] During the welding process, first, the two ends of the hot melt sleeve 82 (the hot melt sleeve 82 is generally pre-processed into a cylindrical shape, and there is an overlapping joint in the circumferential direction) are put on the overlapping sections of the outer sheaths 813 of the two insulation pipes 81, and the arc ends of the hot melt sleeve 82 are usually kept in an overlapping state; then, the two fastening belts 55 are passed around the hot melt sleeve 82, and the belt shaft 56 is buckled at the bayonet 521, and the screws 522 of the two fastening mechanisms 5 are rotated in turn to drive the roller frame 52 to slide toward the center of the rotating ring 3, so that the transition roller 54 and the belt shaft 56 both press the fastening belt 55 onto the hot melt sleeve 82, and then, the winding roller 53 is rotated to drive the fastening belt 55 to wind up, thereby fastening the fastening belt 55 5 is fastened to the hot melt sleeve 82, so that the overlapping sections of the hot melt sleeve 82 and the outer sheaths of the two insulation pipes 81 are tightly wrapped; then, the relative positions of the two circular rail frames 2 are adjusted so that the large-radius circular roller sections of the two pressure rollers 421 of the pressure roller member 42 correspondingly avoid the two fastening belts 55, and then, through the adjustment of the drive assembly 41, the eight pressure roller members 42 are synchronously approached to the center of the rotating ring 3, and the small-radius circular roller sections of the two pressure rollers 421 of each pressure roller member 42 are pressed against the fastening belt 55. The eight pressure roller members 42 constitute outer support sections that are evenly distributed around the circumference of the hot melt sleeve 82, ensuring that the hot melt sleeve 82 is stably mounted and overlapped between the joints of the two insulation sleeves.

[0041] Next, the hot melt welding machine 7 is electrically connected to the resistance wire built into the two overlapping ports on the hot melt sleeve 82. Figure 9As shown, after power is turned on, the resistance wire heats up, causing the overlapping position of the hot melt sleeve 82 and the outer protective layer 813 of the insulation pipe 81 to melt synchronously by heat, and then completing the hot melt welding. Afterwards, wait for the hot melt welding point to cool naturally. During the cooling process, the rotating ring 3 can be used to drive the eight pressure rollers 42 to perform reciprocating rotation and rolling around its center with a small angle, and the roller pressure intensity can be adjusted to make the plastic material evenly extended and dispersed, and to expel air bubbles that may exist in the hot melt material to improve the tightness of the hot melt overlap.

[0042] After cooling is completed, the pressure roller 42 is moved away from the center of the rotating ring 3 through the driving component 41, and the fastening belt 55 is loosened, and the belt shaft 56 is removed from the buckle, and the screw 522 is rotated again to gradually move the roller frame 52 away from the hot melt sleeve 82, and the avoidance operation is completed; then, a layer of heat shrinkable tape 83 is wound around the two hot melt ports outside the hot melt sleeve 82, and a layer of heat shrinkable tape 83 is covered at the overlap seam of the length end of the hot melt sleeve 82; then, the relative positions of the two circular rail frames 2 are adjusted first, so that the step positions of the two pressure rollers 421 of the pressure roller component 42 can be stuck in the port position of the hot melt sleeve 82 to ensure that the heat shrinkable tape 83 is tightly attached to the step position of the port of the hot melt sleeve 82, and then, the driving component 41 is started again, so that the two pressure rollers 421 of the pressure roller component 42 are pressed tightly on the two heat shrinkable tapes 83.

[0043] Next, the heat shrink tape 83 is heat-shrunk by first turning on the hot air blower 6. Subsequently, the rotating ring 3 drives the pressure roller 42 and the hot air blower 6 to rotate synchronously. During the rotation process, the evenly distributed hot air blower 6 evenly and disperses heat around the heat shrink tape 83 to prevent uneven heating of the heat shrink tape 83. After being heated, the heat shrink tape 83 softens and shrinks and is wrapped around the end of the hot melt sleeve 82. The evenly distributed pressure roller 42 can simultaneously roll the heated heat shrink tape 83 to increase the wrapping force between the heat shrink tape 83 and the hot melt sleeve 82, thereby improving the sealing effect of the weld, and can replace manual completion of the automatic heat shrink sealing operation of the heat shrink tape 83. In the present invention, manual heating can be used for the other heat shrink tape 83. At this point, the overall heat-melt welding operation of the insulation pipe 81 is completed. Figure 10 Shown is a structural diagram of two insulation pipes 81 after final welding.

[0044] The present invention provides an electric hot-melt welding machine for heat-insulated pipe joints, which is provided with a welding auxiliary frame that cooperates with an existing hot-melt welding machine 7, and can be specifically used for the front and back operations of hot-melt welding of the outer sheath 813 of the heat-insulated pipe 81. The circular rail frame 2 and the rotating ring 3 in the welding auxiliary frame are both designed with a disconnected structure to facilitate the taking and placing of the heat-insulated pipe 81. The circular rail frame 2 is equipped with a fastening mechanism 5 that can be operated in an avoidable manner to facilitate the tightening operation of the two hot-melt ports of the hot-melt sleeve 82; an adjustable pressing roller mechanism 4 is installed between the rotating rings 3, which can provide evenly distributed external clamping support for the outside of the hot-melt sleeve 82, and cooperates with the fastening mechanism 5 to ensure the stability of the overlap of the hot-melt sleeve 82, and can roller-press the hot-melt part. Tightening and rolling shaping are convenient for operation; in the heating and sealing link of the heat shrinkable tape 83, the rotating ring 3 drives the evenly dispersed hot air blower 6 and the pressure roller 42 to automatically rotate around the heat shrinkable tape 83, which can ensure the uniformity of circumferential heat distribution of the heat shrinkable tape 83, so as to facilitate uniform shrinkage, and the synchronous rolling operation of the pressure roller 42 improves the tightness of the fit between the shrinkable tape and the hot melt sleeve 82; in summary, the welding auxiliary frame provided in the present invention is highly integrated, which meets the various operations before and after the hot melt welding of the outer protective layer 813 of the insulation pipe 81, is easy to operate, and can improve the standardization and standardization of the welding operation of the insulation pipe 81, while ensuring the quality of welding forming, improving the uniformity of quality and avoiding rework operations.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 should not be understood as limiting the present invention.

[0046] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0047] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. An electric hot melt welding machine for heat-insulated pipe joints, comprising a hot melt welding machine and a welding auxiliary frame matched therewith, characterized in that: The welding auxiliary frame includes: Adjust the base; Two circular rail frames are arranged horizontally and coaxially relative to each other and are mounted on an adjustable base. The circular rail frames are split in half vertically. The adjustable base can drive the two circular rail frames to move synchronously apart and apart, as well as to move relative to each other in the axial direction. Two rotating rings are coaxially mounted on two circular rail frames in a one-to-one correspondence; the rotating rings are in a half-split structure; The pressure roller mechanism includes four drive assemblies mounted one-to-one on the four half-split structures of the two rotating rings; multiple pressure rollers are mounted horizontally and rotatably between the two drive assemblies located in opposite positions on the two rotating rings, and all the pressure rollers are distributed along the circumference of the rotating rings; the distance between the multiple pressure rollers relative to the center of the rotating rings is synchronously adjusted under the joint drive of the two drive assemblies; the pressure rollers are in an axially contracted structure; Two fastening mechanisms are mounted on the two circular rail frames in a one-to-one correspondence, and are used to fasten the two heat-melt joint ends of the insulation pipe in a corresponding manner; And two groups of hot air blowers are assembled on the two rotating rings in a one-to-one correspondence; multiple hot air blowers in each group are distributed along the circumference and fixed on the rotating ring, and the air outlets of the hot air blowers are arranged towards the center of the rotating ring.

2. The electric hot-melt welding machine for heat-insulated pipe joints according to claim 1, characterized in that: The adjustment base includes a base plate, on which two guide rails are installed for horizontal relative sliding movement; two circular rail frames are mounted on the two guide rails in a one-to-one correspondence, and two half-broken structures in the circular rail frames are mounted on the guide rails for relative sliding movement along a direction perpendicular to the sliding direction of the guide rails; a double-headed telescopic rod is installed between the two half-broken structures in the two circular rail frames that are in axial relative positions, and the double-headed telescopic rod is fixed to the half-broken structures of the two circular rail frames through two telescopic ends.

3. The electric hot-melt welding machine for heat-insulated pipe joints according to claim 1, characterized in that: The driving assembly includes an arc-shaped plate that is coaxially arranged and rotationally driven and installed on a rotating ring; a plurality of slide rails are fixed along the circumferential direction on the half-split structure of the rotating ring, and a sliding block is slidably installed on the plurality of slide rails, and a connecting rod is hinged between each sliding block and the arc-shaped plate; a pressure roller is horizontally installed between two sliding blocks that are located in relative positions in the axial direction of the rotating ring.

4. The electric hot-melt welding machine for heat-insulated pipe joints according to claim 3, characterized in that: The pressure roller assembly comprises two pressure rollers that are arranged horizontally and symmetrically and are rotatably mounted on two sliding blocks in a one-to-one correspondence. The two pressure rollers are elastically connected and a spline shaft is slidably mounted therebetween.

5. The electric hot-melt welding machine for heat-insulated pipe joints according to claim 1, characterized in that: The fastening mechanism includes a guide frame fixed on one of the half-broken structures in the circular rail frame, the guide frame is equipped with a tightening frame that moves and adjusts toward the center of the rotating ring, the tightening frame is equipped with a tightening belt that provides tightening adjustment, and one end of the tightening belt is detachably arranged on the tightening frame.

6. The electric hot-melt welding machine for heat-insulated pipe joints according to claim 5, characterized in that: The tightening frame includes a roller frame slidably mounted on the guide frame, on which a winding roller is horizontally rotatably mounted; one end of the fastening belt is fixed on the winding roller, and the other end is fixed to a belt shaft; a bayonet is provided on the roller frame, and the belt shaft is buckled at the bayonet.

7. The electric hot-melt welding machine for heat-insulated pipe joints according to claim 4, characterized in that: The pressing roller is a stepped circular roller structure consisting of two circular roller segments with different diameters, and the circular roller segment with the larger diameter is arranged close to the sliding block.

8. The electric hot-melt welding machine for heat-insulated pipe joints according to claim 1, characterized in that: The rotating ring is provided with a gear ring.

9. The electric hot-melt welding machine for heat-insulated pipe joints according to claim 1, characterized in that: The air outlet end of the hot air blower is equipped with a flattened air outlet cover with a rectangular structure, and the long side of the flattened air outlet cover is arranged along the axial direction of the rotating ring.

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