Apparatus and method for seamless tube end thickening

Abstract

The invention provides a device and method for thickening the end of a seamless pipe, and belongs to the technical field of seamless pipe end welding, the device comprises a pipe end heating assembly, a pressure loading assembly and a seamless pipe fixing mechanism, the seamless pipe fixing mechanism comprises a fixing mold and a connecting assembly, the fixing mold is buckled up and down, and the connecting assembly is used for connecting the two half fixing molds; a plurality of clamping grooves are formed in the inner circumferential surface of the fixed mold; one end of each clamping plate is arranged in the corresponding clamping groove in a sliding manner; a plurality of rows of reinforcing grooves are formed in the inner circumferential face of the fixed mold, a reinforcing block is arranged in each reinforcing groove in a sliding mode, and a force transmission assembly is arranged between the clamping plate and the corresponding row of reinforcing blocks. A driving mechanism is arranged on the fixed mold, and the force transmission assembly is used for applying thrust towards the seamless tube to the whole row of reinforcing blocks when the clamping plate bears thrust in the direction that the seamless tube is far away from the pressure loading assembly. According to the seamless pipe end welding device, the stability of the seamless pipe during end welding is improved, and the end welding quality of the seamless pipe is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of seamless pipe end welding, and more specifically, relates to a device and method for thickening the end of a seamless pipe. Background Art

[0002] Seamless pipe is a long steel strip with a hollow cross-section and no seams around it. When connecting the ends of seamless pipes, flange connection, upsetting the ends of seamless pipes or surfacing are usually used to increase the wall thickness of the pipes. However, flange connection is prone to airtightness problems. The strength of the pipe wall thickened by surfacing is relatively low. In addition, it is not advisable to increase the wall thickness of thin-walled seamless pipes by upsetting.

[0003] There is a Chinese patent with reference number CN103639609A, which discloses a method and device for thickening the end of a thin-walled seamless pipe. The device includes: a pipe end heating device, a loading device, a thin-walled pipe clamping and fixing device, and a control system, wherein the thin-walled pipe clamping and fixing device includes a fixed baffle and a locking nut, and the seamless pipe is clamped inside the fixed baffle by rotating the locking nut.

[0004] The above-mentioned device adopts relevant technologies such as pressure welding and brazing to thicken the wall of the end of the seamless pipe, and in the thickening process, the press applies a continuous lateral load to the joint and acts on the thin-walled seamless pipe; and because the seamless pipe is inserted into the through hole of the fixed baffle, there is no clamping and fixing effect between the seamless pipe and the through hole of the fixed baffle, and the seamless pipe is only clamped by rotating the locking nut to clamp the tail of the fixed baffle. Therefore, when the press is working, the seamless pipe is prone to displacement, affecting the welding quality of the end of the seamless pipe. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for thickening the end of a seamless pipe, so as to solve the technical problem in the prior art that when a press machine is working, the seamless pipe is easily displaced, which affects the welding quality of the end of the seamless pipe.

[0006] To achieve the above-mentioned purpose, in the first aspect, the technical solution adopted by the present invention is: to provide a device for thickening the end of a seamless pipe, comprising a pipe end heating component, a pressure loading component and a seamless pipe fixing mechanism, wherein the seamless pipe fixing mechanism comprises a fixed mold that is buckled up and down and a connecting component for connecting the two halves of the fixed mold, and the seamless pipe is clamped in the fixed mold; a plurality of coaxially circumferentially distributed clamping plates are arranged on the side of the fixed mold away from the pressure loading component, and a plurality of circumferentially distributed clamping grooves are opened on the inner circumference of the fixed mold at one end away from the pressure loading component, so that the seamless pipe can be clamped in the fixed mold. One end of the clamping plate is set in the corresponding clamping groove along the radial sliding of the fixed mold; the inner circumference of the fixed mold is provided with multiple rows of reinforcement grooves, each of the reinforcement grooves is provided with a reinforcement block along the radial sliding of the fixed mold, and a force transmission component is arranged between the clamping plate and the corresponding row of reinforcement blocks; the fixed mold is provided with a driving mechanism for driving all the clamping plates to slide to clamp the seamless pipe, and the force transmission component is used to apply a thrust to the whole row of reinforcement blocks toward the seamless pipe when the clamping plate is subjected to a thrust in the direction of the seamless pipe away from the pressure loading component.

[0007] In combination with the first aspect, in a possible implementation, the force transmission component includes a force transmission column and an extrusion block, a force transmission groove connected to the corresponding clamping groove and the entire row of reinforcement grooves is opened in the fixed mold, the force transmission column is located in the force transmission groove and is fixed to the corresponding clamping plate; an extrusion groove is opened on the side of the force transmission column facing the reinforcement block, and the extrusion block is fixed to one end of the reinforcement block facing the force transmission column; after the driving mechanism drives the clamping plate to clamp the seamless pipe, the extrusion block is located in the extrusion groove, and the extrusion block and the extrusion groove are in contact with each other and inclined away from the side wall of the clamping plate.

[0008] In combination with the first aspect, in a possible implementation, a plurality of receiving grooves connected to the force transmission grooves are opened in the fixed mold, and the force transmission assembly also includes a return spring arranged in the corresponding receiving groove, and one end of the return spring is fixed to the corresponding force transmission column; when the return spring is in a natural state, the clamping plate is in an initial state where the seamless pipe is not clamped.

[0009] In combination with the first aspect, in a possible implementation, the driving mechanism includes a threaded sleeve, a threaded tube and a positioning assembly, the threaded sleeve is coaxially fixed to the end of the fixed mold away from the pressure loading assembly, and the threaded sleeve is arranged to be buckled up and down following the fixed mold; the threaded tube is threadedly connected to the inside of the threaded sleeve, and the inner end of the threaded tube has an annular inclined surface for squeezing each of the clamping plates; the positioning assembly is arranged on the threaded tube, and the positioning assembly is used to fix the position of the threaded tube after the threaded tube squeezes all the clamping plates to clamp the seamless tube.

[0010] In combination with the first aspect, in a possible implementation, the positioning assembly includes a plug plate, a connecting ring, a positioning component and an extrusion component; the end face of the threaded tube is provided with a plurality of sockets parallel to its own axis, the plug plate has a plurality of and is slidably connected in the corresponding sockets, and the connecting ring is fixed at the outer ends of all the plug plates; when the threaded tube squeezes all the clamping plates to clamp the seamless tube, the sockets are directly opposite to the clamping grooves; the width of the plug plate is consistent with the width of the clamping groove; the positioning component is arranged on the connecting ring and is used to fix the position of the connecting ring after the plug plate is inserted into the clamping groove; the extrusion component has a plurality of groups and is arranged at the corresponding plug plate ends, and after the plug plate ends are inserted into the clamping groove, the extrusion component presses the clamping plate against the seamless tube.

[0011] In combination with the first aspect, in a possible implementation, the positioning component includes a positioning spring, a positioning block, a pull ring and a pull rope, the inner circumference of the connecting ring is provided with a plurality of positioning grooves, and the outer circumference of the threaded tube is provided with a clamping groove connected to the corresponding positioning groove; the positioning spring is arranged in the corresponding positioning groove, the positioning block is slidably arranged in the positioning groove and is connected to the positioning spring; when the positioning spring is in a natural state, the positioning block is simultaneously located in the positioning groove and the clamping groove; the pull ring is sleeved on the connecting ring, one end of the pull rope is fixed on the pull rope, and the other end is inserted into the corresponding positioning groove and fixedly connected to the positioning block.

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

[0013] In combination with the first aspect, in a possible implementation, the extrusion component includes an extrusion spring, a push rod, a rotating column and a winding rope, a top groove is provided on the inner end surface of each of the plug plates, the extrusion spring is arranged in the top groove, the push rod is slidably connected in the top groove and connected to the extrusion spring; when the extrusion spring is in a 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 plug plate facing the seamless pipe, a through hole is provided on the inner side of the plug plate, one end of the winding rope is fixed to the inner end of the push rod, and the other end is fixed and wound around the rotating shaft of the rotating column after passing through the through hole, and the rotating column is fixed to its own rotating shaft; when the push rod slides toward the inside of the top groove, the outer end of the rotating column rotates toward the seamless pipe.

[0014] In combination with the first aspect, in a possible implementation, the connecting assembly includes a connecting ear and a connecting piece, wherein the connecting ear is arranged on each side of the two halves of the fixed mold, and the connecting ears on the two halves of the fixed mold are arranged to be opposite to each other in an upper and lower manner, and the connecting piece is provided in multiple groups and is used to fix the two connecting ears that are opposite to each other in an upper and lower manner.

[0015] In a second aspect, the present invention further provides a method for thickening the end of a seamless pipe, using the above-mentioned device for thickening the end of a seamless pipe, comprising the following steps: A. Place the seamless pipe in the lower fixed mold, snap the upper fixed mold onto the lower fixed mold, and fix it through the connecting assembly so that the seamless pipe is clamped in the fixed mold; B. Insert the threaded pipe from the tail end of the seamless pipe and screw it into the threaded sleeve until the threaded pipe squeezes the clamping plate tightly onto the seamless pipe, and then fix the position of the threaded pipe after rotation by the positioning component, and then the end of the seamless pipe can be welded; C. After welding is completed, release the positioning component from fixing the threaded pipe, unscrew the threaded pipe, and release the fixation between the two halves of the fixed mold through the connecting component to take out the seamless pipe.

[0016] The beneficial effect of the device for thickening the end of a seamless pipe provided by the present invention is that, compared with the prior art, the present invention first performs a preliminary clamping on the seamless pipe by fastening two halves of a fixed mold, and then uses a driving mechanism to slide all clamping plates to clamp the seamless pipe. At this time, there is a force transmission component between each clamping plate and a corresponding row of reinforcement blocks to transmit the force. When the seamless pipe is subjected to the thrust of the pressure loading component, the force transmission component can apply a thrust toward the direction of the seamless pipe to the entire row of reinforcement blocks, that is, the greater the lateral thrust received by the clamping plate, the greater the radial thrust of the reinforcement block on the seamless pipe, and the more stable the seamless pipe, thereby greatly improving the stability of the seamless pipe during end welding and ensuring the end welding quality of the seamless pipe.

[0017] The beneficial effects of the method for thickening the end of a seamless pipe provided by the present invention are as follows: compared with the prior art, the present invention can improve the convenience of placing the seamless pipe by means of a fixed mold that snaps together up and down, without the need to laterally align the inner hole of the fixed mold; through the cooperation of the threaded pipe and the threaded sleeve, all the clamping plates can be clamped onto the seamless pipe at the same time, and then the position of the threaded pipe is fixed by a positioning assembly, which not only improves the efficiency of all the clamping plates clamping the seamless pipe at the same time, but also improves the stability of the clamping plates after clamping the seamless pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A cross-sectional view of a device for thickening the end of a seamless pipe provided in an embodiment of the present invention; Figure 2 A partial cross-sectional view of a force transmission assembly and a driving mechanism provided in an embodiment of the present invention; Figure 3 for Figure 2 Part A of the figure provides a partial enlarged schematic diagram of the force transmission component; Figure 4 A partial cross-sectional view of a positioning component provided by an embodiment of the present invention; Figure 5 for Figure 2 Part B provides a partial enlarged schematic diagram of the extruded component; Figure 6 A cross-sectional view of a connection assembly provided in accordance with an embodiment of the present invention.

[0020] Among them, the reference numerals in the figures are as follows: 1. Pipe end heating assembly; 2. Pressure loading assembly; 3. Seamless pipe fixing mechanism; 31. Fixed die; 311. Clamping groove; 312. Reinforcement groove; 313. Force transmission groove; 314. Accommodation groove; 32. Connecting assembly; 321. Connecting ear; 322. Connecting piece; 4. Clamping plate; 5. Reinforcement block; 6. Force transmission assembly; 61. Force transmission column; 611. Extrusion groove; 62. Extrusion block; 63. Reset spring; 7. Driving mechanism; 71. threaded sleeve; 72. threaded tube; 721. socket; 722. slot; 8. positioning assembly; 81. plug plate; 811. top slot; 812. perforation; 82. connecting ring; 821. positioning slot; 83. positioning component; 831. positioning spring; 832. positioning block; 833. pull ring; 834. pull rope; 84. extrusion component; 841. extrusion spring; 842. push rod; 843. rotating column; 844. winding rope. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0022] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0023] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0024] The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. The directions or positional relationships indicated by the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0026] In the description of the present invention, “multiple” means two or more, and “several” means one or more, unless otherwise clearly and specifically defined.

[0027] The device and method for thickening the end of a seamless pipe provided by the present invention are now described.

[0028] 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 pipe, comprising a pipe end heating component 1, a pressure loading component 2 and a seamless pipe fixing mechanism 3, wherein the seamless pipe fixing mechanism 3 comprises a fixed mold 31 that is buckled up and down and a connecting component 32 for connecting the two halves of the fixed mold 31, and the seamless pipe is clamped in the fixed mold 31; a plurality of coaxially circumferentially distributed clamping plates 4 are arranged on the side of the fixed mold 31 away from the pressure loading component 2, and a plurality of circumferentially distributed clamping grooves 311 are opened on the inner circumference of the fixed mold 31 away from the pressure loading component 2, and the clamping plates 311 are clamped on the inner circumferential surface of the fixed mold 31. 4 is arranged in the corresponding clamping groove 311 along the radial direction of the fixed mold 31; the inner circumference of the fixed mold 31 is provided with multiple rows of reinforcement grooves 312, and each reinforcement groove 312 is provided with a reinforcement block 5 along the radial direction of the fixed mold 31, and a force transmission component 6 is arranged between the clamping plate 4 and the corresponding row of reinforcement blocks 5; the fixed mold 31 is provided with a driving mechanism 7 for driving all the clamping plates 4 to slide to clamp the seamless pipe, and the force transmission component 6 is used to apply a thrust to the whole row of reinforcement blocks 5 in the direction of the seamless pipe when the clamping plate 4 is subjected to a thrust in the direction of the seamless pipe away from the pressure loading component 2.

[0029] Specifically, a joint for melting and joining with the end of the seamless pipe is provided at one end of the fixed mold 31 facing the pressure loading device. Referring to the prior art with announcement number CN103639609A, the pipe wall of the joint is divided into an inner layer and an outer layer, the inner layer is a solder layer, the melting point of the inner layer solder is lower than that of the outer layer material, and the inner diameter of the joint is interference fit with the outer diameter of the thin-walled seamless pipe.

[0030] Specifically, reference may be made to the prior art with announcement number CN103639609A, in which the pipe end heating device comprises an inner induction heating coil and an outer induction heating coil, the pressure loading device comprises a press, an annular push plate and a mandrel, the annular push plate being fixed on the push plate of the press, and being capable of axially loading the joint under the power of the press, the mandrel being arranged inside the thin-walled pipe, and the size of the mandrel being matched with the lumen size of the thin-walled seamless pipe.

[0031] The inner induction heating coil is embedded in the mandrel, and the outer induction heating coil is sleeved on the outside of the joint and fixed against the baffle. The inner and outer induction heating coils heat the joint and the thin-walled seamless pipe at the same time, so that the solder layer of the joint reaches a molten state. When the press loads the joint, the mandrel supports the wall of the thin-walled seamless pipe, and the right end face of the boss in the middle of the mandrel is aligned with the left end face of the thin-walled pipe. After unloading, the mandrel is first pulled out of the thin-walled pipe, and then the welded thin-walled seamless pipe and the joint are disassembled.

[0032] Compared with the prior art, the device for thickening the end of a seamless pipe provided in this embodiment firstly clamps the seamless pipe by fastening two halves of a fixed mold 31, and then slides all the clamping plates 4 to clamp the seamless pipe through a driving mechanism 7. At this time, there is a force transmission component 6 between each clamping plate 4 and a corresponding row of reinforcement blocks 5 to transmit the force. When the seamless pipe is subjected to the thrust of the pressure loading component 2, the force transmission component 6 can apply a thrust toward the direction of the seamless pipe to the entire row of reinforcement blocks 5, that is, the greater the lateral thrust received by the clamping plate 4, the greater the radial thrust of the reinforcement block 5 on the seamless pipe, and the more stable the seamless pipe, thereby greatly improving the stability of the seamless pipe during end welding and ensuring the end welding quality of the seamless pipe.

[0033] like Figures 2 to 3 As shown, a specific implementation mode provided by the present invention based on the first implementation mode is as follows: The force transmission component 6 includes a force transmission column 61 and an extrusion block 62. A force transmission groove 313 connected to the corresponding clamping groove 311 and the entire row of reinforcement grooves 312 is opened in the fixed mold 31. 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 opened on the side of the force transmission column 61 facing the reinforcement block 5, and the extrusion block 62 is fixed at the end of the reinforcement block 5 facing the force transmission column 61; after the driving mechanism 7 drives the clamping plate 4 to clamp the seamless pipe, the extrusion block 62 is located in the extrusion groove 611, and the extrusion block 62 and the extrusion groove 611 are in contact with each other and inclined away from the side wall of the clamping plate 4.

[0034] When the seamless pipe applies a lateral force to the clamping plate 4, the clamping plate 4 generates an extrusion tendency on the extrusion blocks 62 on a whole row of reinforcement blocks 5 through the force transmission column 61. The force transmission column 61 further presses the whole row of reinforcement blocks 5 against the seamless pipe through the extrusion blocks 62, thereby improving the fixing stability of the seamless pipe.

[0035] like Figures 2 to 3 As shown, a specific implementation mode provided by the present invention based on the first implementation mode is as follows: A plurality of receiving grooves 314 connected to the force transmission groove 313 are provided in the fixed mold 31. The force transmission assembly 6 also includes a return spring 63 arranged in the corresponding receiving groove 314. One end of the return spring 63 is fixed to the corresponding force transmission column 61. When the return spring 63 is in a natural state, the clamping plate 4 is in an initial state where the seamless pipe is not clamped.

[0036] After the driving mechanism 7 releases the fixation of the clamping plate 4, the reset spring 63 can drive the corresponding clamping plate 4 and the force transmission column 61 to reset, so as to facilitate the installation of the next seamless pipe end welding.

[0037] like Figure 2 and Figure 4 As shown, a specific implementation mode provided by the present invention based on the first implementation mode is as follows: The driving mechanism 7 includes a threaded sleeve 71, a threaded tube 72 and a positioning assembly 8. The threaded sleeve 71 is coaxially fixed to the end of the fixed mold 31 away from the pressure loading assembly 2, and the threaded sleeve 71 is arranged to be buckled up and down following the fixed mold 31; 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 squeezing each clamping plate 4; the positioning assembly 8 is arranged on the threaded tube 72, and the positioning assembly 8 is used to fix the position of the threaded tube 72 after the threaded tube 72 squeezes all the clamping plates 4 to clamp the seamless tube.

[0038] After the fixed mold 31 clamps the seamless pipe, the threaded pipe 72 is inserted from the end of the seamless pipe and then screwed into the threaded sleeve 71. The annular inclined surface at the inner end of the threaded pipe 72 squeezes all the clamping plates 4 at the same time, so that all the clamping plates 4 clamp the seamless pipe at the same time, and then the position of the threaded pipe 72 is further fixed by the positioning component 8, thereby improving the efficiency and stability of all the clamping plates 4 clamping the seamless pipe.

[0039] like Figure 2 and Figure 4 As shown, a specific implementation mode provided by the present invention based on the first implementation mode is as follows: The positioning assembly 8 includes a plug plate 81, a connecting ring 82, a positioning component 83 and an extrusion component 84; the end surface of the threaded tube 72 is provided with a plurality of plug holes 721 parallel to its own axis, the plug plate 81 has a plurality of and is slidably connected in the corresponding plug holes 721, and the connecting ring 82 is fixed at the outer ends of all the plug plates 81; when the threaded tube 72 squeezes all the clamping plates 4 to clamp the seamless tube, the plug holes 721 are aligned with the clamping grooves 311 one by one; the width of the plug plate 81 is consistent with the width of the clamping groove 311 (reference Figure 6 ); The positioning component 83 is arranged on the connecting ring 82 and is used to fix the position of the connecting ring 82 after the plug plate 81 is inserted into the clamping groove 311; the extrusion component 84 has multiple groups and is arranged at the ends of the corresponding plug plates 81. After the ends of the plug plates 81 are inserted into the clamping groove 311, the extrusion components 84 press the clamping plate 4 against the seamless pipe.

[0040] When the threaded tube 72 is screwed into the threaded sleeve 71, the connecting ring 82 is rotated to drive the threaded tube 72 to rotate through each plug plate 81, thereby improving the convenience of operation of rotating the threaded tube 72; when the threaded tube 72 squeezes and tightens all the clamping plates 4 on the seamless tube, the connecting ring 82 is pushed to make the inner ends of all the plug plates 81 inserted into the corresponding clamping grooves 311. At this time, the threaded tube 72 cannot be rotated, that is, the threaded tube 72 and the fixed mold 31 are in a relatively fixed state, and then the connecting ring 82 is fixed to 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, thereby improving the stability of the threaded tube 72; and the extruding component 84 at the inner end of each plug plate 81 tightens the clamping plate 4, which not only further improves the stability of the clamping plate 4, but also its reaction force improves the stability of the plug plate 81.

[0041] like Figure 4 As shown, a specific implementation mode provided by the present invention based on the first implementation mode is as follows: The positioning component 83 includes a positioning spring 831, a positioning block 832, a pull ring 833 and a pull rope 834. The inner circumference of the connecting ring 82 is provided with a plurality of positioning grooves 821, and the outer circumference of the threaded tube 72 is provided with a clamping groove 722 connected to the corresponding positioning groove 821; the positioning spring 831 is arranged in the corresponding positioning groove 821, and the positioning block 832 is slidably arranged in the positioning groove 821 and connected to the positioning spring 831; when the positioning spring 831 is in a natural state, the positioning block 832 is simultaneously located in the positioning groove 821 and the clamping groove 722; the pull ring 833 is sleeved on the connecting ring 82, one end of the pull rope 834 is fixed on the pull rope 834, and the other end is inserted into the corresponding positioning groove 821 and fixedly connected to the positioning block 832.

[0042] Furthermore, the positioning block 832 is located in the slot 722 and is tilted toward one side of the fixed mold 31 .

[0043] When the connecting ring 82 is pushed to insert the inner end of the plug plate 81 into the clamping groove 311, the outer end of the threaded tube 72 presses the inclined surface of the positioning block 832 to make it completely enter the positioning groove 821 until the positioning groove 821 is connected with the corresponding clamping groove 722. The positioning spring 831 pushes the outer end of the positioning block 832 into the clamping groove 722, thereby realizing automatic fixation of the connecting ring 82 and the threaded tube 72.

[0044] After the welding of the end of the seamless pipe is completed, the pull ring 833 is pulled in the direction 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 plug plate 81 can be pulled to fix the mold 31 without changing the direction of force, and then the connecting ring 82 can be rotated to screw the threaded pipe 72 out of the threaded sleeve 71, thereby improving the overall convenience of operation.

[0045] like Figure 5 As shown, a specific implementation mode provided by the present invention based on the first implementation mode is as follows: The extrusion component 84 includes an extrusion spring 841, a push rod 842, a rotating column 843 and a winding rope 844. Each inner end surface of the plug plate 81 is provided with a top groove 811, the extrusion spring 841 is arranged in the top groove 811, and 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 a 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 plug plate 81 toward the seamless pipe On the inner side, a through hole 812 is opened on the inner side of the insert plate 81, one end of the winding rope 844 is fixed to the inner end of the top rod 842, and the other end is fixed and wound around the rotating shaft of the rotating column 843 after passing through the through hole 812, and 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 toward the inside of the top groove 811, the outer end of the rotating column 843 rotates toward the seamless pipe until it is tightened, and the outer side surface of the insert plate 81 fits tightly against the side wall of the extrusion groove 611.

[0046] Furthermore, a torsion spring is provided between the rotating shaft of the rotating column 843 and the inserting plate 81. When the torsion spring is in a natural state, the rotating column 843 is in a retracted state, and at this time, the extrusion spring 841 is in a natural state.

[0047] When the insert plate 81 drives the extrusion component 84 to be inserted into the clamping groove 311, the inner wall of the clamping groove 311 squeezes the push rod 842, and the push rod 842 gradually slides toward the top groove 811, and the extrusion spring 841 is compressed. 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 surface of the insert plate 81 pressed against the clamping groove 311, thereby improving the stability of the insert plate 81 and the clamping plate 4.

[0048] When the plug plate 81 is disengaged from the clamping groove 311, the extrusion spring 841 and the torsion spring respectively drive the fixed rod and the rotating shaft to reset, and at the same time the winding rope 844 is also reset and wound around the rotating shaft of the rotating column 843 to facilitate the installation of the next seamless pipe end welding.

[0049] like Figure 6 As shown, a specific implementation mode provided by the present invention based on the first implementation mode is as follows: The connecting assembly 32 includes a connecting ear 321 and a connecting piece 322. The connecting ear 321 is arranged 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 arranged to be opposite to each other up and down. There are multiple groups of connecting pieces 322 and they are used to fix the two connecting ears 321 that are opposite to each other up and down.

[0050] Specifically, in this embodiment, the connecting member 322 is a bolt and a nut. The bolt penetrates two vertically opposite connecting ears 321 and is then tightened with the nut thread, thereby improving the convenience of operation.

[0051] Based on the same inventive concept, the second embodiment of the present invention provides a method for thickening the end of a seamless pipe, using the above-mentioned device for thickening the end of a seamless pipe, comprising the following steps: A. Place the seamless pipe in the lower fixed mold 31, snap the upper fixed mold 31 onto the lower fixed mold 31, and fix it through the connecting assembly 32, so that the seamless pipe is clamped in the fixed mold 31; B. Insert the threaded tube 72 from the tail end of the seamless tube and screw it into the threaded sleeve 71 until the threaded tube 72 squeezes the clamping plate 4 against the seamless tube, and then fix the position of the threaded tube 72 after rotation by the positioning assembly 8, and then the seamless tube end welding can be carried out; C. After welding is completed, release the fixing of the positioning component 8 on 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.

[0052] Compared with the prior art, the method for thickening the end of a seamless pipe provided in this embodiment can improve the convenience of placing the seamless pipe by means of the fixed mold 31 that is buckled up and down, without the need to align the inner hole of the fixed mold 31 laterally; all the clamping plates 4 can be clamped onto the seamless pipe at the same time by means of the cooperation of the threaded pipe 72 and the threaded sleeve 71, and the position of the threaded pipe 72 is fixed by means of the positioning assembly 8, which not only improves the efficiency of all the clamping plates 4 clamping the seamless pipe at the same time, but also improves the stability of the clamping plates 4 after clamping the seamless pipe.

[0053] The above are only 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 in the protection scope of the present invention.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. A device for thickening the end of a seamless pipe, comprising a pipe end heating component (1), a pressure loading component (2) and a seamless pipe fixing mechanism (3), characterized in that: The seamless pipe fixing mechanism (3) comprises a fixed die (31) that is buckled up and down and a connecting assembly (32) for connecting the two halves of the fixed die (31), and the seamless pipe is clamped in the fixed die (31); a plurality of coaxially circumferentially distributed clamping plates (4) are provided on a side of the fixed die (31) that is away from the pressure loading assembly (2); a plurality of circumferentially distributed clamping grooves (311) are provided on an inner circumferential surface of the fixed die (31) that is away from the pressure loading assembly (2); one end of the clamping plate (4) is radially slidably arranged in the corresponding clamping groove (311) along the fixed die (31); The inner circumferential surface of the mold (31) is provided with a plurality of rows of reinforcement grooves (312), and a reinforcement block (5) is arranged in each reinforcement groove (312) to slide radially along the fixed mold (31), and a force transmission component (6) is arranged between the clamping plate (4) and the corresponding row of reinforcement blocks (5); the fixed mold (31) is provided with a driving mechanism (7) for driving all the clamping plates (4) to slide to clamp the seamless pipe, and the force transmission component (6) is used to apply a thrust in the direction of the seamless pipe to the entire row of reinforcement blocks (5) when the clamping plate (4) is subjected to a thrust in the direction of the seamless pipe away from the pressure loading component (2).

2. The device for thickening the end of a seamless pipe according to claim 1, characterized in that: The force transmission component (6) comprises a force transmission column (61) and an extrusion block (62); a force transmission groove (313) connected to the corresponding clamping groove (311) and the entire row of reinforcement grooves (312) is provided in the fixed mold (31); 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 a side of the force transmission column (61) facing the reinforcement block (5); the extrusion block (62) is fixed to an end of the reinforcement block (5) facing the force transmission column (61); after the driving mechanism (7) drives the clamping plate (4) to clamp the seamless pipe, the extrusion block (62) is located in the extrusion groove (611), and the extrusion block (62) and the extrusion groove (611) are in contact with each other and are inclined away from the side wall of the clamping plate (4).

3. The device for thickening the end of a seamless pipe according to claim 2, characterized in that: The fixed mold (31) is provided with a plurality of receiving grooves (314) connected to the force transmission grooves (313). The force transmission assembly (6) further comprises a return spring (63) arranged in the corresponding receiving groove (314). One end of the return spring (63) is fixed to the corresponding force transmission column (61). When the return spring (63) is in a natural state, the clamping plate (4) is in an initial state in which the seamless pipe is not clamped.

4. The device for thickening the end of a seamless pipe according to claim 1, characterized in that: The driving mechanism (7) comprises a threaded sleeve (71), a threaded tube (72) and a positioning assembly (8); the threaded sleeve (71) is coaxially fixed to one end of the fixed die (31) away from the pressure loading assembly (2), and the threaded sleeve (71) is arranged to be buckled up and down following the fixed die (31); 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 squeezing each clamping plate (4); the positioning assembly (8) is arranged on the threaded tube (72), and the positioning assembly (8) is used to fix the position of the threaded tube (72) after the threaded tube (72) squeezes all the clamping plates (4) to clamp the seamless tube.

5. The device for thickening the end of a seamless pipe according to claim 4, characterized in that: The positioning assembly (8) comprises a plug plate (81), a connecting ring (82), a positioning component (83) and an extrusion component (84); the end surface of the threaded tube (72) is provided with a plurality of plug holes (721) parallel to its own axis, the plug plate (81) has a plurality of and is slidably connected in the corresponding plug holes (721), and the connecting ring (82) is fixed to the outer ends of all the plug plates (81); when the threaded tube (72) squeezes all the clamping plates (4) to clamp the seamless tube, the plug holes (721) and the clamping grooves (31 1) one-to-one alignment; the width of the insert plate (81) is consistent with the width of the clamping groove (311); the positioning component (83) is arranged on the connecting ring (82) and is used to fix the position of the connecting ring (82) after the insert plate (81) is inserted into the clamping groove (311); the extrusion component (84) has a plurality of groups and is arranged at the ends of the corresponding insert plates (81); after the ends of the insert plates (81) are inserted into the clamping groove (311), the extrusion component (84) presses the clamping plate (4) against the seamless pipe.

6. The device for thickening the end of a seamless pipe according to claim 5, characterized in that: The positioning component (83) comprises a positioning spring (831), a positioning block (832), a pull ring (833) and a pull rope (834); the inner circumference of the connecting ring (82) is provided with a plurality of positioning grooves (821); the outer circumference of the threaded tube (72) is provided with a clamping groove (722) connected to the corresponding positioning groove (821); the positioning spring (831) is arranged in the corresponding positioning groove (821); the positioning block (832) is slidably arranged in the positioning groove (821) and is connected to the positioning spring (831); when the positioning spring (831) is in a natural state, the positioning block (832) is simultaneously located in the positioning groove (821) and the clamping groove (722); the pull ring (833) is sleeved on the connecting ring (82); one end of the pull rope (834) is fixed on the pull rope (834), and the other end is inserted into the corresponding positioning groove (821) and is fixedly connected to the positioning block (832).

7. The device for thickening the end of a seamless pipe according to claim 6, characterized in that: The positioning block (832) is located in the clamping groove (722) and is arranged to be inclined toward one side of the fixed mold (31).

8. The device for thickening the end of a seamless pipe according to claim 5, characterized in that: The extrusion component (84) comprises an extrusion spring (841), a push rod (842), a rotating column (843) and a winding rope (844); a top groove (811) is provided on the inner end surface of each plug plate (81); the extrusion spring (841) is arranged 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 a 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 plug plate (81) facing the seamless pipe, and a through hole (812) is provided on the inner side of the plug plate (81). 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 pipe.

9. The device for thickening the end of a seamless pipe according to claim 1, characterized in that: The connecting assembly (32) comprises a connecting ear (321) and a connecting piece (322), wherein 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 arranged vertically opposite to each other and in close contact with each other, and the connecting piece (322) is provided in multiple groups and is used to fix two vertically opposite connecting ears (321).

10. A method for thickening the end of a seamless pipe, characterized in that: The device for thickening the end of a seamless pipe as claimed in any one of claims 4 to 8 comprises the following steps: A. placing the seamless pipe in the lower fixed mold (31), snapping the upper fixed mold (31) onto the lower fixed mold (31), and fixing them via a connecting assembly (32) so that the seamless pipe is clamped in the fixed mold (31); B. Insert the threaded tube (72) from the rear end of the seamless tube and screw it into the threaded sleeve (71) until the threaded tube (72) squeezes the clamping plate (4) against the seamless tube, and then fixes the position of the threaded tube (72) after rotation by the positioning assembly (8), and then the end of the seamless tube can be welded; C. After welding is completed, the fixing of the threaded tube (72) by the positioning assembly (8) is released, and the threaded tube (72) is unscrewed. The fixing between the two halves of the fixed mold (31) is released through the connecting assembly (32), and the seamless tube can be taken out.

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