Device and method for thickening the end of seamless pipe

Abstract

This invention provides an apparatus and method for thickening the ends of seamless tubes, belonging to the technical field of seamless tube end welding. The invention includes a tube end heating assembly, a pressure loading assembly, and a seamless tube fixing mechanism. The seamless tube fixing mechanism includes a fixing mold that interlocks with its upper and lower halves and a connecting assembly for connecting the two halves of the fixing mold. Multiple clamping grooves are formed on the inner circumferential surface of the fixing mold, and one end of a clamping plate is slidably disposed within a corresponding clamping groove. Multiple rows of reinforcing grooves are formed on the inner circumferential surface of the fixing mold, and a reinforcing block is slidably disposed within each reinforcing groove. A force transmission assembly is disposed between the clamping plate and a corresponding row of reinforcing blocks. A driving mechanism is provided on the fixing mold, and the force transmission assembly is used to apply a thrust towards the seamless tube to the entire row of reinforcing blocks when the clamping plate is subjected to a thrust from the seamless tube away from the pressure loading assembly. This invention improves the stability of seamless tubes during end welding and ensures the quality of the seamless tube end welding.

Description

Technical Field

[0001] This invention belongs to the technical field of seamless tube end welding, and more specifically, relates to an apparatus and method for thickening the ends of seamless tubes. Background Technology

[0002] Seamless steel pipe is a long strip of steel with a hollow cross-section and no seams around its perimeter. When connecting the ends of seamless steel pipes, flanges are usually used, the ends of the seamless steel pipes are uptaken, or welding is used to increase the pipe wall thickness. However, flange connections are prone to airtightness problems, and the pipe wall thickened by welding has relatively low strength. Moreover, uptake is not suitable for increasing the pipe end wall thickness of thin-walled seamless steel pipes.

[0003] A Chinese patent with publication number CN103639609A is available for reference. It discloses a method and apparatus for thickening the end of a thin-walled seamless tube. The apparatus includes: a tube end heating device, a loading device, a thin-walled tube clamping and fixing device, and a control system. The thin-walled tube clamping and fixing device includes a fixing baffle and a locking nut. The seamless tube is clamped inside the fixing baffle by rotating the locking nut.

[0004] The aforementioned device employs pressure welding and brazing techniques to thicken the wall of the seamless tube end. During the thickening process, the press applies a continuous lateral load to the joint and acts on the thin-walled seamless tube. Since the seamless tube is inserted into the through hole of the fixed baffle, there is no clamping or fixing effect between the seamless tube and the through hole of the fixed baffle. The fixed baffle is only clamped by rotating the locking nut. Therefore, the seamless tube is prone to displacement when the press is working, which affects the welding quality of the seamless tube end. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus and method for thickening the ends of seamless tubes, so as to solve the technical problem in the prior art that seamless tubes are prone to displacement during the operation of a press, which affects the welding quality of the ends of the seamless tubes.

[0006] To achieve the above objectives, in a first aspect, the technical solution adopted by the present invention is: to provide a device for thickening the end of a seamless tube, comprising a tube end heating assembly, a pressure loading assembly, and a seamless tube fixing mechanism, wherein the seamless tube fixing mechanism includes a fixing mold that snaps together vertically and a connecting assembly for connecting the two halves of the fixing mold, and the seamless tube is clamped within the fixing mold; the fixing mold has a plurality of coaxially circumferentially distributed clamping plates on the side opposite to the pressure loading assembly, and the inner circumferential surface of the fixing mold has a plurality of circumferentially distributed clamping grooves at the end opposite to the pressure loading assembly. One end of the clamping plate is slidably disposed radially within the corresponding clamping groove of the fixed mold; multiple rows of reinforcing grooves are formed on the inner circumferential surface of the fixed mold, and a reinforcing block is slidably disposed radially within each reinforcing groove; a force transmission component is disposed between the clamping plate and the corresponding row of reinforcing blocks; the fixed mold is provided with a drive mechanism for driving all the clamping plates to slide to clamp the seamless tube, and the force transmission component is used to apply a thrust toward the seamless tube to the entire row of reinforcing blocks when the clamping plate is subjected to a thrust from the seamless tube away from the pressure loading component.

[0007] In conjunction with the first aspect, in one possible implementation, the force transmission component includes a force transmission column and an extrusion block. The fixed mold has a force transmission groove communicating with the corresponding clamping groove and the row of reinforcing grooves. The force transmission column is located in the force transmission groove and fixed to the corresponding clamping plate. An extrusion groove is formed on the side of the force transmission column facing the reinforcing block. The extrusion block is fixed to the end of the reinforcing block facing the force transmission column. After the driving mechanism drives the clamping plate to clamp the seamless tube, the extrusion block is located in the extrusion groove, and the extrusion block and the extrusion groove are attached to each other and inclined away from the side wall of the clamping plate.

[0008] In conjunction with the first aspect, in one possible implementation, the fixed mold has multiple receiving slots connected to the force transmission groove, and the force transmission component further includes a return spring disposed in the corresponding receiving slot, one end of the return spring being fixed to the corresponding force transmission column; when the return spring is in its natural state, the clamping plate is in the initial state of not clamping the seamless tube.

[0009] In conjunction with the first aspect, in one possible implementation, the driving mechanism includes a threaded sleeve, a threaded tube, and a positioning component. The threaded sleeve is coaxially fixed to one end of the fixed mold away from the pressure loading component, and the threaded sleeve is engaged vertically with the fixed mold. The threaded tube is threadedly connected inside the threaded sleeve, and the inner end of the threaded tube has an annular inclined surface for pressing each of the clamping plates. The positioning component is disposed on the threaded tube, and the positioning component is used to fix the position of the threaded tube after the threaded tube has pressed all the clamping plates to clamp the seamless tube.

[0010] In conjunction with the first aspect, in one possible implementation, the positioning assembly includes an insert plate, a connecting ring, a positioning component, and a pressing component; the threaded tube end face has several insertion holes parallel to its own axis, the insert plate has multiple insertion holes and is slidably connected in the corresponding insertion holes, and the connecting ring is fixed to the outer end of all the insert plates; when the threaded tube presses all the clamping plates to clamp the seamless tube, the insertion holes and the clamping grooves are aligned one-to-one; the width of the insert plate is the same as the width of the clamping groove; the positioning component is disposed on the connecting ring and is used to fix the position of the connecting ring after the insert plate is inserted into the clamping groove; the pressing component has multiple sets and is disposed at the ends of the corresponding insert plates, and after the ends of the insert plates are inserted into the clamping grooves, the pressing component presses the clamping plates against the seamless tube.

[0011] In conjunction with the first aspect, in one possible implementation, the positioning component includes a positioning spring, a positioning block, a pull ring, and a pull rope. The inner circumferential surface of the connecting ring has several positioning grooves, and the outer circumferential surface of the threaded tube has a slot communicating with the corresponding positioning groove. The positioning spring is disposed within the corresponding positioning groove, and the positioning block is slidably disposed within the positioning groove and connected to the positioning spring. When the positioning spring is in its natural state, the positioning block is simultaneously located within both the positioning groove and the slot. The pull ring is sleeved on the connecting ring, and one end of the pull rope is fixed to the pull rope, while the other end passes through the corresponding positioning groove and is fixedly connected to the positioning block.

[0012] In conjunction with the first aspect, in one possible implementation, the positioning block is located within the slot and is tilted toward one side of the fixed mold.

[0013] In conjunction with the first aspect, in one possible implementation, the extrusion component includes an extrusion spring, a push rod, a rotating column, and a winding rope. Each insert plate has a top groove on its inner end face. The extrusion spring is disposed within the top groove, and the push rod is slidably connected within the top groove and connected to the extrusion spring. When the extrusion spring is in its natural state, one end of the push rod extends out of the top groove. The rotating column is rotatably connected to the inner side of the insert plate facing the seamless tube. A through hole is formed on the inner side of the insert plate. One end of the winding rope is fixed to the inner end of the push rod, and the other end passes through the through hole and is fixed and wound around the rotating shaft of the rotating column. The rotating column is fixed to its own rotating shaft. When the push rod slides towards the inside of the top groove, the outer end of the rotating column rotates towards the seamless tube.

[0014] In conjunction with the first aspect, in one possible implementation, the connecting assembly includes connecting ears and connectors. One connecting ear is provided on each side of the two halves of the fixing mold, and the connecting ears on the two halves of the fixing mold are arranged vertically facing each other. Multiple sets of connectors are provided and used to fix the two vertically facing connecting ears.

[0015] Secondly, the present invention also provides a method for thickening the end of a seamless tube, employing the aforementioned apparatus for thickening the end of a seamless tube, comprising the following steps:

[0016] A. Place the seamless tube into the lower fixed mold, fasten the upper fixed mold onto the lower fixed mold, and fix it with the connecting component to clamp the seamless tube in the fixed mold;

[0017] B. Insert the threaded tube into the seamless tube from the tail end and screw it into the threaded sleeve until the threaded tube squeezes and presses the clamping plate against the seamless tube. Then fix the position of the rotated threaded tube with the positioning component, and then weld the end of the seamless tube.

[0018] C. After welding is completed, release the positioning component from the threaded tube, unscrew the threaded tube, and release the fixation between the two halves of the mold through the connecting component, so that the seamless tube can be taken out.

[0019] The beneficial effects of the device for thickening the ends of seamless tubes provided by the present invention are as follows: Compared with the prior art, the present invention first clamps the seamless tube by fastening two halves of the fixed mold, and then uses a driving mechanism to slide all the clamping plates to clamp the seamless tube. At this time, there is a force transmission component between each clamping plate and the corresponding row of reinforcing blocks to transmit the force. When the seamless tube is subjected to the thrust of the pressure loading component, the force transmission component can apply a thrust towards the seamless tube to the entire row of reinforcing blocks. That is, the greater the lateral thrust of the clamping plate, the greater the radial thrust of the reinforcing blocks on the seamless tube, and the more stable the seamless tube is. This greatly improves the stability of the seamless tube during end welding and ensures the end welding quality of the seamless tube.

[0020] The beneficial effects of the method for thickening the end of a seamless tube provided by the present invention are as follows: Compared with the prior art, the present invention can improve the ease of placing the seamless tube by using a fixed mold that snaps together from top to bottom, without the need to align the inner hole of the fixed mold laterally; the cooperation of the threaded tube and the threaded sleeve can enable all clamping plates to clamp onto the seamless tube simultaneously, and the position of the threaded tube is fixed by the positioning component, which not only improves the efficiency of all clamping plates clamping the seamless tube at the same time, but also improves the stability of the clamping plates after clamping the seamless tube. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A cross-sectional view of an apparatus for thickening the end of a seamless tube, provided in an embodiment of the present invention;

[0023] Figure 2 A partial cross-sectional view of the force transmission component and drive mechanism provided in an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A partially enlarged schematic diagram of the force transmission components provided in Part A;

[0025] Figure 4 A partial cross-sectional view of the positioning component provided in an embodiment of the present invention;

[0026] Figure 5 for Figure 2 A partially enlarged schematic diagram of the extrusion component provided in Part B;

[0027] Figure 6 A cross-sectional view of a connection component provided in an embodiment of the present invention.

[0028] The labels for the attached figures are as follows:

[0029] 1. Pipe end heating assembly; 2. Pressure loading assembly; 3. Seamless pipe fixing mechanism; 31. Fixing mold; 311. Clamping groove; 312. Reinforcing groove; 313. Force transmission groove; 314. Receiving groove; 32. Connecting assembly; 321. Connecting ear; 322. Connecting piece; 4. Clamping plate; 5. Reinforcing block; 6. Force transmission assembly; 61. Force transmission column; 611. Extrusion groove; 62. Extrusion block; 63. Return spring; 7. Drive mechanism; 71. Threaded sleeve; 72. Threaded tube; 721. Insertion hole; 722. Slot; 8. Positioning assembly; 81. Insert plate; 811. Top groove; 812. Through hole; 82. Connecting ring; 821. Positioning groove; 83. Positioning component; 831. Positioning spring; 832. Positioning block; 833. Pull ring; 834. Pull rope; 84. Pressing component; 841. Pressing spring; 842. Top rod; 843. Rotating column; 844. Winding rope. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0032] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0034] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0036] The apparatus and method for thickening the ends of seamless tubes provided by the present invention will now be described.

[0037] like Figure 1 and Figure 2 As shown, the first embodiment of the present invention provides a device for thickening the end of a seamless tube, including a tube end heating assembly 1, a pressure loading assembly 2, and a seamless tube fixing mechanism 3. The seamless tube fixing mechanism 3 includes a fixing mold 31 that snaps together vertically and a connecting assembly 32 for connecting the two halves of the fixing mold 31. The seamless tube is clamped in the fixing mold 31. A plurality of coaxially circumferentially distributed clamping plates 4 are provided on the side of the fixing mold 31 away from the pressure loading assembly 2. A plurality of circumferentially distributed clamping grooves 311 are opened on the inner circumferential surface of the fixing mold 31 away from the pressure loading assembly 2. 4 One end is slidably disposed radially in the corresponding clamping groove 311 along the fixed mold 31; multiple rows of reinforcing grooves 312 are opened on the inner circumferential surface of the fixed mold 31, and a reinforcing block 5 is slidably disposed radially in each reinforcing groove 312 along the fixed mold 31. A force transmission component 6 is disposed between the clamping plate 4 and the corresponding row of reinforcing blocks 5; a drive mechanism 7 is provided on the fixed mold 31 for driving all clamping plates 4 to slide to clamp the seamless tube. The force transmission component 6 is used to apply a thrust toward the seamless tube to the entire row of reinforcing blocks 5 when the clamping plate 4 is pushed away from the pressure loading component 2.

[0038] Specifically, the fixed mold 31 is provided with a joint for fusion bonding with the end of the seamless tube at one end facing the pressure loading device. Referring to the prior art of CN103639609A, the tube wall of the joint is divided into inner and outer layers. The inner layer is a solder layer, and the melting point of the inner solder is lower than that of the outer material. The inner diameter of the joint is interference-fitted with the outer diameter of the thin-walled seamless tube.

[0039] Specifically, refer to the prior art with announcement number CN103639609A. The pipe end heating device includes an inner induction heating coil and an outer induction heating coil. The pressure loading device includes a press, an annular push plate and a mandrel. The annular push plate is fixed on the push plate of the press and can axially load the joint under the power of the press. The mandrel is located inside the thin-walled pipe, and the size of the mandrel matches the size of the tube cavity of the thin-walled seamless pipe.

[0040] The inner induction heating coil is embedded inside the mandrel, while the outer induction heating coil is sleeved on the outside of the joint and pressed tightly against the fixed baffle. The inner and outer induction heating coils simultaneously heat the joint where it meets the thin-walled seamless tube, causing the solder layer of the joint to melt. When the press loads the joint, the mandrel supports the wall of the thin-walled seamless tube. The right end face of the boss in the middle of the mandrel is aligned with the left end face of the thin-walled tube. After unloading, the mandrel is first pulled out of the thin-walled tube, and then the welded thin-walled seamless tube and the joint are disassembled.

[0041] Compared with the prior art, the device for thickening the end of a seamless tube provided in this embodiment first clamps the seamless tube by fastening the two halves of the fixed mold 31 together, and then the driving mechanism 7 makes all the clamping plates 4 slide to clamp the seamless tube. At this time, there is a force transmission component 6 between each clamping plate 4 and the corresponding row of reinforcing blocks 5 to transmit force. When the seamless tube is pushed by the pressure loading component 2, the force transmission component 6 can apply a push force towards the seamless tube to the row of reinforcing blocks 5. That is, the greater the lateral push force on the clamping plate 4, the greater the radial push force of the reinforcing blocks 5 on the seamless tube, and the more stable the seamless tube is. This greatly improves the stability of the seamless tube when it is welded at the end and ensures the quality of the end welding of the seamless tube.

[0042] like Figures 2 to 3 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0043] The force transmission component 6 includes a force transmission column 61 and an extrusion block 62. A force transmission groove 313 is provided in the fixed mold 31, which is connected to the corresponding clamping groove 311 and the row of reinforcing grooves 312. The force transmission column 61 is located in the force transmission groove 313 and is fixed to the corresponding clamping plate 4. An extrusion groove 611 is provided on the side of the force transmission column 61 facing the reinforcing block 5. The extrusion block 62 is fixed to the end of the reinforcing block 5 facing the force transmission column 61. After the driving mechanism 7 drives the clamping plate 4 to clamp the seamless tube, the extrusion block 62 is located in the extrusion groove 611, and the extrusion block 62 and the extrusion groove 611 are attached to each other and inclined on the side wall away from the clamping plate 4.

[0044] When the seamless tube applies a lateral force to the clamping plate 4, the clamping plate 4 exerts a squeezing tendency on the squeezing blocks 62 on a row of reinforcing blocks 5 through the force transmission column 61. The force transmission column 61, through the squeezing blocks 62, makes the row of reinforcing blocks 5 further press against the seamless tube, thereby improving the fixing stability of the seamless tube.

[0045] like Figures 2 to 3 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0046] The fixed mold 31 has multiple receiving slots 314 connected to the force transmission slot 313. The force transmission component 6 also includes a reset spring 63 disposed in the corresponding receiving slot 314. One end of the reset spring 63 is fixed to the corresponding force transmission column 61. When the reset spring 63 is in its natural state, the clamping plate 4 is in the initial state of not clamping the seamless tube.

[0047] After the drive mechanism 7 releases the clamping plate 4, the return spring 63 can drive the corresponding clamping plate 4 and the force transmission column 61 to return to their original positions, so as to facilitate the installation of the next seamless tube end welding.

[0048] like Figure 2 and Figure 4 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0049] The drive mechanism 7 includes a threaded sleeve 71, a threaded tube 72, and a positioning component 8. The threaded sleeve 71 is coaxially fixed to one end of the fixed mold 31 away from the pressure loading component 2, and the threaded sleeve 71 is engaged with the fixed mold 31 vertically. The threaded tube 72 is threadedly connected to the inside of the threaded sleeve 71, and the inner end of the threaded tube 72 has an annular inclined surface for pressing each clamping plate 4. The positioning component 8 is disposed on the threaded tube 72 and is used to fix the position of the threaded tube 72 after the threaded tube 72 has pressed all the clamping plates 4 to clamp the seamless tube.

[0050] After the seamless tube is clamped by the fixed mold 31, the threaded tube 72 is inserted from the end of the seamless tube and then screwed into the threaded sleeve 71. The annular bevel at the inner end of the threaded tube 72 simultaneously presses against all the clamping plates 4, so that all the clamping plates 4 clamp the seamless tube at the same time. Then, the position of the threaded tube 72 is further fixed by the positioning component 8, which improves the efficiency and stability of all the clamping plates 4 clamping the seamless tube.

[0051] like Figure 2 and Figure 4 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0052] Positioning assembly 8 includes insert plates 81, connecting rings 82, positioning components 83, and pressing components 84; the end face of the threaded tube 72 has several insertion holes 721 parallel to its own axis, the insert plates 81 have multiple holes and are slidably connected in the corresponding insertion holes 721, and the connecting rings 82 are fixed to the outer ends of all insert plates 81; when the threaded tube 72 presses all clamping plates 4 to clamp the seamless tube, the insertion holes 721 and the clamping grooves 311 are aligned one-to-one; the width of the insert plates 81 is the same as the width of the clamping grooves 311 (reference). Figure 6 Positioning component 83 is disposed on connecting ring 82 and is used to fix the position of connecting ring 82 after insert plate 81 is inserted into clamping groove 311; pressing component 84 has multiple sets and is disposed at the ends of corresponding insert plates 81. After the ends of insert plates 81 are inserted into clamping groove 311, pressing component 84 presses clamping plate 4 against seamless tube.

[0053] When the threaded tube 72 is screwed into the threaded sleeve 71, rotating the connecting ring 82 will drive the threaded tube 72 to rotate through each insert plate 81, improving the ease of operation of rotating the threaded tube 72. After the threaded tube 72 squeezes and presses all the clamping plates 4 against the seamless tube, pushing the connecting ring 82 will cause the inner ends of all the insert plates 81 to be inserted into the corresponding clamping grooves 311. At this time, the threaded tube 72 cannot rotate, that is, the threaded tube 72 and the fixed mold 31 are in a relatively fixed state. Then, the connecting ring 82 is fixed on the threaded tube 72 by the positioning component 83, so that the connecting ring 82 and the threaded tube 72 can neither move nor rotate, improving the stability of the threaded tube 72. In addition, the squeezing component 84 at the inner end of each insert plate 81 presses against the clamping plate 4, which further improves the stability of the clamping plate 4, and its reaction force improves the stability of the insert plate 81.

[0054] like Figure 4 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0055] The positioning component 83 includes a positioning spring 831, a positioning block 832, a pull ring 833, and a pull rope 834. The inner circumferential surface of the connecting ring 82 is provided with a plurality of positioning grooves 821, and the outer circumferential surface of the threaded tube 72 is provided with a slot 722 communicating with the corresponding positioning groove 821. The positioning spring 831 is disposed in the corresponding positioning groove 821, and the positioning block 832 is slidably disposed in the positioning groove 821 and connected to the positioning spring 831. When the positioning spring 831 is in its natural state, the positioning block 832 is simultaneously located in the positioning groove 821 and the slot 722. The pull ring 833 is sleeved on the connecting ring 82, and one end of the pull rope 834 is fixed to the pull rope 834, and the other end passes through the corresponding positioning groove 821 and is fixedly connected to the positioning block 832.

[0056] Furthermore, the positioning block 832 is located in the slot 722 and is inclined toward the side of the fixed mold 31.

[0057] When the connecting ring 82 is pushed to insert the inner end of the insert plate 81 into the clamping groove 311, the outer end of the threaded tube 72 presses against the inclined surface of the positioning block 832, causing it to fully enter the positioning groove 821. When the positioning groove 821 is connected to the corresponding slot 722, the positioning spring 831 pushes the outer end of the positioning block 832 into the slot 722, thereby achieving automatic fixation of the connecting ring 82 and the threaded tube 72.

[0058] After the seamless tube end is welded, pull the pull ring 833 away from the fixed mold 31. The pull ring 833 drives all the positioning blocks 832 to disengage from the slot 722 through the pull rope 834. The connecting ring 82 and the insert plate 81 can be pulled to fix the mold 31 without changing the direction of force. Then, rotate the connecting ring 82 to unscrew the threaded tube 72 out of the threaded sleeve 71, which improves the overall ease of operation.

[0059] like Figure 5 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0060] The extrusion component 84 includes an extrusion spring 841, a push rod 842, a rotating column 843, and a winding rope 844. Each insert plate 81 has a top groove 811 on its inner end face. The extrusion spring 841 is disposed within the top groove 811, and the push rod 842 is slidably connected within the top groove 811 and connected to the extrusion spring 841. When the extrusion spring 841 is in its natural state, one end of the push rod 842 extends out of the top groove 811. The rotating column 843 is rotatably connected to the insert plate 81 facing the seamless tube. Inside, the insert plate 81 has a through hole 812. One end of the winding rope 844 is fixed to the inner end of the top rod 842, and the other end passes through the through hole 812 and is fixed and wound on the rotating shaft of the rotating column 843. The rotating column 843 is fixed to its own rotating shaft. When the top rod 842 is squeezed by the inner wall of the clamping groove 311 and slides towards the inside of the top groove 811, the outer end of the rotating column 843 rotates towards the seamless tube until it is pressed tightly. The outer side of the insert plate 81 is pressed tightly against the side wall of the extrusion groove 611.

[0061] Furthermore, a torsion spring is provided between the rotating shaft of the rotating column 843 and the insert plate 81. When the torsion spring is in its natural state, the rotating column 843 is in its retracted state, and the compression spring 841 is in its natural state.

[0062] When the insert plate 81 drives the pressing component 84 to be inserted into the clamping groove 311, the inner wall of the clamping groove 311 presses the push rod 842, and the push rod 842 gradually slides into the top groove 811. The pressing spring 841 is compressed, and at the same time, the push rod 842 drives the rotating column 843 to rotate through the winding rope 844, so that the outer end of the rotating column 843 is pressed against the clamping plate 4. At the same time, the reaction force of the rotating column 843 makes the outer side of the insert plate 81 press against the clamping groove 311, thereby improving the stability of the insert plate 81 and the clamping plate 4.

[0063] When the insert plate 81 disengages from the clamping groove 311, the compression spring 841 and the torsion spring respectively drive the fixed rod and the rotating shaft to reset. At the same time, the winding rope 844 also resets and winds onto the rotating shaft of the rotating column 843 to facilitate the installation of the next seamless tube end welding.

[0064] like Figure 6 As shown, based on the first embodiment, the present invention provides another specific embodiment as follows:

[0065] The connecting component 32 includes connecting ears 321 and connectors 322. One connecting ear 321 is provided on each side of the two halves of the fixed mold 31, and the connecting ears 321 on the two halves of the fixed mold 31 are aligned vertically. Multiple sets of connectors 322 are provided and used to fix the two vertically aligned connecting ears 321.

[0066] Specifically, in this embodiment, the connector 322 is a bolt and a nut. The bolt passes through the two vertically aligned connecting lugs 321 and is then tightened with the nut thread, which improves the ease of operation.

[0067] Based on the same inventive concept, a second embodiment of the present invention provides a method for thickening the end of a seamless tube, employing the above-described apparatus for thickening the end of a seamless tube, and comprising the following steps:

[0068] A. Place the seamless tube into the lower fixed mold 31, fasten the upper fixed mold 31 onto the lower fixed mold 31, and fix it with the connecting component 32 so that the seamless tube is clamped in the fixed mold 31.

[0069] B. Insert the threaded tube 72 into the seamless tube from the tail end and screw it into the threaded sleeve 71 until the threaded tube 72 presses the clamping plate 4 against the seamless tube. Then fix the position of the rotated threaded tube 72 by the positioning component 8, and then the seamless tube end welding can be carried out.

[0070] C. After welding is completed, release the positioning component 8 from fixing the threaded tube 72, unscrew the threaded tube 72, and release the fixing between the two halves of the fixing mold 31 through the connecting component 32, so that the seamless tube can be taken out.

[0071] Compared with the prior art, the method for thickening the end of a seamless tube provided in this embodiment can improve the ease of placing the seamless tube by using the upper and lower locking mold 31, eliminating the need for lateral alignment with the inner hole of the fixing mold 31; the cooperation of the threaded tube 72 and the threaded sleeve 71 can enable all clamping plates 4 to clamp onto the seamless tube simultaneously, and the position of the threaded tube 72 is fixed by the positioning component 8, which not only improves the efficiency of all clamping plates 4 clamping the seamless tube simultaneously, but also improves the stability of the clamping plates 4 after clamping the seamless tube.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0073] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A device for thickening the end of a seamless tube, comprising a tube end heating assembly (1), a pressure loading assembly (2), and a seamless tube fixing mechanism (3), characterized in that, The seamless tube fixing mechanism (3) includes a fixing mold (31) that snaps together from top to bottom and a connecting assembly (32) for connecting the two halves of the fixing mold (31). The seamless tube is clamped inside the fixing mold (31). The fixing mold (31) has a plurality of coaxially distributed clamping plates (4) on the side away from the pressure loading assembly (2). The inner circumferential surface of the fixing mold (31) away from the pressure loading assembly (2) has a plurality of circumferentially distributed clamping grooves (311). One end of the clamping plate (4) is slidably disposed in the corresponding clamping groove (311) along the radial direction of the fixing mold (31). The inner circumferential surface of the mold (31) is provided with multiple rows of reinforcing grooves (312), and each reinforcing groove (312) is provided with a reinforcing block (5) that slides radially along the fixed mold (31). A force transmission component (6) is provided between the clamping plate (4) and the corresponding row of reinforcing blocks (5). The fixed mold (31) is provided with a drive mechanism (7) for driving all the clamping plates (4) to slide to clamp the seamless tube. The force transmission component (6) is used to apply a thrust toward the seamless tube to the entire row of reinforcing blocks (5) when the clamping plate (4) is pushed away from the pressure loading component (2). The driving mechanism (7) includes a threaded sleeve (71), a threaded tube (72), and a positioning assembly (8); the positioning assembly (8) includes an insert plate (81), a connecting ring (82), a positioning component (83), and a pressing component (84); the end face of the threaded tube (72) is provided with a plurality of insertion holes (721) parallel to its own axis, the insert plate (81) has a plurality of insertion holes (721) and is slidably connected in the corresponding insertion holes (721), and the connecting ring (82) is fixed to the outer end of all the insert plates (81); when the threaded tube (72) presses all the clamping plates (4) to clamp the seamless tube, The insertion hole (721) and the clamping groove (311) are directly opposite each other; the width of the insertion plate (81) is the same as the width of the clamping groove (311); the positioning component (83) is disposed on the connecting ring (82) and is used to fix the position of the connecting ring (82) after the insertion plate (81) is inserted into the clamping groove (311); the pressing component (84) has multiple sets and is disposed at the end of the corresponding insertion plate (81). After the end of the insertion plate (81) is inserted into the clamping groove (311), the pressing component (84) presses the clamping plate (4) against the seamless tube.

2. The apparatus for thickening the ends of seamless tubes as described in claim 1, characterized in that, The force transmission component (6) includes a force transmission column (61) and an extrusion block (62). The fixed mold (31) has a force transmission groove (313) that connects to the corresponding clamping groove (311) and the row of reinforcing grooves (312). The force transmission column (61) is located in the force transmission groove (313) and fixed to the corresponding clamping plate (4). The force transmission column (61) has an extrusion groove (611) on the side facing the reinforcing block (5). The extrusion block (62) is fixed to the end of the reinforcing block (5) facing the force transmission column (61). After the driving mechanism (7) drives the clamping plate (4) to clamp the seamless tube, the extrusion block (62) is located in the extrusion groove (611), and the extrusion block (62) and the extrusion groove (611) are attached to each other and inclined away from the side wall of the clamping plate (4).

3. The apparatus for thickening the ends of seamless tubes as described in claim 2, characterized in that, The fixed mold (31) has multiple receiving slots (314) connected to the force transmission slot (313). The force transmission component (6) also includes a return spring (63) disposed in the corresponding receiving slot (314). One end of the return spring (63) is fixed to the corresponding force transmission column (61). When the return spring (63) is in its natural state, the clamping plate (4) is in the initial state of not clamping the seamless tube.

4. The apparatus for thickening the ends of seamless tubes as described in claim 1, characterized in that, The threaded sleeve (71) is coaxially fixed to one end of the fixed mold (31) away from the pressure loading component (2), and the threaded sleeve (71) is engaged with the fixed mold (31) in a vertically fastened manner; the threaded tube (72) is threadedly connected inside the threaded sleeve (71), and the inner end of the threaded tube (72) has an annular inclined surface for pressing each of the clamping plates (4); the positioning component (8) is disposed on the threaded tube (72), and the positioning component (8) is used to fix the position of the threaded tube (72) after the threaded tube (72) has pressed all the clamping plates (4) to clamp the seamless tube.

5. The apparatus for thickening the ends of seamless tubes as described in claim 4, characterized in that, The positioning component (83) includes a positioning spring (831), a positioning block (832), a pull ring (833), and a pull rope (834). The inner circumferential surface of the connecting ring (82) is provided with a plurality of positioning grooves (821), and the outer circumferential surface of the threaded tube (72) is provided with a slot (722) communicating with the corresponding positioning groove (821). The positioning spring (831) is disposed in the corresponding positioning groove (821), and the positioning block (832) is slidably disposed in the positioning groove (821) and connected to the positioning spring (831). When the positioning spring (831) is in its natural state, the positioning block (832) is simultaneously located in the positioning groove (821) and the slot (722). The pull ring (833) is sleeved on the connecting ring (82), and one end of the pull rope (834) is fixed on the pull rope (834), and the other end passes through the corresponding positioning groove (821) and is fixedly connected to the positioning block (832).

6. The apparatus for thickening the ends of seamless tubes as described in claim 5, characterized in that, The positioning block (832) is located in the slot (722) and is inclined toward one side of the fixed mold (31).

7. The apparatus for thickening the ends of seamless tubes as described in claim 4, characterized in that, The extrusion component (84) includes an extrusion spring (841), a push rod (842), a rotating column (843), and a winding rope (844). Each insert plate (81) has a top groove (811) on its inner end face. The extrusion spring (841) is disposed in the top groove (811). The push rod (842) is slidably connected in the top groove (811) and connected to the extrusion spring (841). When the extrusion spring (841) is in its natural state, one end of the push rod (842) extends out of the top groove (811). The rotating column (843) is rotatably connected to the inner side of the insert plate (81) facing the seamless tube. The insert plate (81) has a through hole (812) on its inner side. One end of the winding rope (844) is fixed to the inner end of the top rod (842), and the other end passes through the through hole (812) and is fixed and wound on the rotating shaft of the rotating column (843). The rotating column (843) is fixed to its own rotating shaft. When the top rod (842) slides toward the inside of the top groove (811), the outer end of the rotating column (843) rotates toward the seamless tube.

8. The apparatus for thickening the ends of seamless tubes as described in claim 1, characterized in that, The connecting component (32) includes connecting ears (321) and connectors (322). One connecting ear (321) is provided on each side of the two halves of the fixed mold (31), and the connecting ears (321) on the two halves of the fixed mold (31) are aligned vertically. The connectors (322) are provided in multiple sets and are used to fix the two vertically aligned connecting ears (321).

9. A method for thickening the end of a seamless tube, characterized in that, The apparatus for thickening the ends of seamless tubes as described in any one of claims 4-7 comprises the following steps: A. Place the seamless tube into the lower fixed mold (31), fasten the upper fixed mold (31) onto the lower fixed mold (31), and fix it with the connecting component (32) so that the seamless tube is clamped in the fixed mold (31); B. Insert the threaded tube (72) into the threaded sleeve (71) from the tail end of the seamless tube until the threaded tube (72) presses the clamping plate (4) against the seamless tube. Then fix the position of the rotated threaded tube (72) by the positioning component (8) and then weld the end of the seamless tube. C. After welding is completed, release the positioning component (8) from fixing the threaded tube (72), unscrew the threaded tube (72), and release the fixing between the two halves of the fixed mold (31) through the connecting component (32) so that the seamless tube can be taken out.

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