Workpiece welding positioning tool

Abstract

A mounting cavity is formed in a mounting sleeve in a hollow design mode, a holding piece is movably connected into a driving seat, a center positioning mechanism is arranged outside the mounting sleeve and connected with a movable lead screw, a positioning clamping mechanism is arranged at the right end of the outer portion of the mounting sleeve, and a clamping mechanism is arranged at the right end of the outer portion of the mounting sleeve and connected with the movable lead screw. A driving mechanism is mounted on the right side of the surface of the outer ring of the mounting sleeve, the driving mechanism is connected with a positioning and clamping mechanism, the driving mechanism is further connected with a holding piece, and the center positioning mechanism and the positioning and clamping mechanism are arranged, so that the tool can be fixed to a steel pipe through the center positioning mechanism; the tool can ensure that the central axis of the tool is collinear with the central axis of the steel pipe, and the arranged positioning and clamping mechanism can position and fix the flange and ensure that the central axis of the flange is collinear with the central axis of the tool, so that the axis of the flange is collinear with the axis of the steel pipe, the coaxiality between the flange and the steel pipe is ensured, and subsequent welding is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of welding fixtures, and in particular to a workpiece welding positioning fixture. Background Art

[0002] In pipeline engineering, the connection between two pipes is usually made by flange connection or direct welding of two pipe joints, among which flange connection is the most commonly used. Most steel pipes need to be welded with flanges when connected. Generally, a flange is put on the end of the steel pipe, or the flange is at the front end of the steel pipe and the flange and the steel pipe are welded together, so that the steel pipes can be connected.

[0003] When connecting a steel pipe to a flange, in most cases, the dimensions of the flange and the steel pipe are not completely compatible, that is, the inner diameter of the flange may be larger or smaller than the outer diameter of the steel pipe. When welding flanges and steel pipes at the construction project site, due to the lack of positioning fixtures, the flanges and steel pipes are often not properly connected, and the coaxiality of the flanges and steel pipes cannot be guaranteed. The position of the flanges is skewed, which causes the flanges on the two pipes to be misaligned, and the screw holes on adjacent flanges cannot be aligned. When the pipeline is subsequently installed, the bolts cannot pass through the screw holes on the two flanges, which will affect the subsequent installation. To this end, we have designed a workpiece welding positioning tool. Summary of the Invention

[0004] The workpiece welding positioning tool proposed in the present invention solves the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A workpiece welding positioning tool comprises a mounting sleeve, wherein the mounting sleeve is hollowed to form a mounting cavity, a movable screw is rotatably mounted in the mounting cavity via a bearing, a driving seat is fixed to the right end of the movable screw, the driving seat is slidably connected to the mounting cavity, and a gripping member is movably connected in the driving seat, the gripping member passes through the mounting sleeve and is placed at the right end of the outer portion thereof, a center positioning mechanism is provided on the outer portion of the mounting sleeve, and the center positioning mechanism is connected to the movable screw; A positioning clamping mechanism is provided at the outer right end of the mounting sleeve, and a driving mechanism is installed on the right side of the outer ring surface of the mounting sleeve. The driving mechanism is connected to the positioning clamping mechanism, and the driving mechanism is also connected to the holding member; The outside of the installation sleeve is sleeved with a steel pipe, the right end of the steel pipe is installed with a flange, the inner wall of the steel pipe abuts against the center positioning mechanism, and the outer ring surface of the flange abuts against the positioning clamping mechanism.

[0006] Preferably, the outer ring surface of the mounting sleeve is provided with a plurality of groups of adjusting sliding holes distributed in an annular shape, and the adjusting sliding holes are communicated with the mounting cavity inside the mounting sleeve; The center positioning mechanism includes two symmetrically distributed moving screw seats, which are respectively threadedly mounted on the left and right ends of the moving screw. Four sets of evenly distributed lifting and deflecting rods are rotatably mounted on the outer ring surfaces of the two moving screw seats through shaft pins. An abutment roller is rotatably connected between the two corresponding lifting and deflecting rods on the two moving screw seats through shaft pins. The abutment roller is tightly pressed against the inner wall of the steel pipe, and the spiral lines in the left and right moving screw seats rotate in opposite directions. When the movable screw rotates in the forward direction, the two movable screw seats can approach each other, thereby causing the four abutment rollers to move away from each other, and the outer diameter of the circular structure formed by the four abutment rollers increases. When the movable screw rotates in the reverse direction, the two movable screw seats move away from each other, the four abutment rollers move closer to each other, and the outer diameter of the circular structure formed by the four abutment rollers decreases. By rotating the movable screw, the four abutment rollers can be moved away from or closer to each other, thereby being suitable for the installation and positioning of steel pipes of various sizes.

[0007] Preferably, the positioning and clamping mechanism includes a plurality of abutment frames distributed in a circumferential array on the right side of the outer ring surface of the mounting sleeve, wherein the abutment frames are formed with lifting sliding holes at the front and rear sides, wherein a lifting member is rotatably mounted in the lifting sliding holes via a bearing, and a lifting screw seat is slidably mounted in the lifting sliding holes, and the lifting screw seat is connected to the lifting member; A shaft is fixed to the left end of the lifting screw seat, and a positioning roller is rotatably installed on the shaft. The four positioning rollers are all in contact with the outer ring surface of the flange, and the right side surface of the flange is in contact with the right side surface of the abutment frame. A limiting member is also installed on the end of the positioning roller away from the abutment frame.

[0008] Preferably, the abutment frame includes a fixing frame fixed to the right side of the outer ring surface of the mounting sleeve, a deflection frame is rotatably mounted on the fixing frame via a rotating pin and an axle seat, the lifting slide hole is provided on the deflection frame, and a driving groove is formed in the internal cavity of the fixing frame; The lifting member includes a lifting screw rotatably installed in the lifting slide hole through a bearing, the lifting screw seat is threadedly connected to the lifting screw, and a rotating part is rotatably installed on the fixed frame through a bearing, and the rotating part is close to one end of the lifting screw and is rotatably connected to the lifting screw through a universal joint. The end of the rotating part close to the mounting sleeve extends into the driving groove, and a driving bevel gear is installed on the part of the rotating part extending into the driving groove. The abutment frame is divided into two parts: a deflection frame and a fixed frame, and the lifting member is divided into two parts: a lifting screw and a rotating part. The deflection frame and the lifting screw can be flipped and folded along the axis of the rotating pin and the pin rod, which can reduce the overall volume of the tooling fixture and is easy to carry and place.

[0009] Preferably, the right half of the upper end of the shaft seat is designed to be a horizontal structure to form a flat surface. When the deflection frame is parallel to the fixed frame, the flat surface contacts the surface of the deflection frame on the side close to the fixed frame. At this time, the deflection frame cannot continue to deflect to the right, and the deflection frame can be limited so that its maximum deflection angle is 90 degrees. When the lifting screw seat is at the top or bottom end of the lifting slide hole, the axis of the shaft seat is collinear with the universal joint axis of the rotating part. At this time, when the deflection frame is folded, the lifting screw can also be folded together. When there is a certain angle between the two, deflection and folding cannot be performed.

[0010] Preferably, the left end of the shaft on the positioning roller is extended, and the left end of the shaft is threaded to form a threaded portion, the limiting member includes two nuts threadedly connected to the threaded portion, a mounting plate is pressed between the two nuts, a clamping block is fixed to the right side of the mounting plate, the inward half of the clamping block away from the side surface of the mounting plate is inclined, the clamping block abuts against the left side surface of the flange, a circular hole is opened on the mounting plate, the mounting plate is sleeved on the threaded portion through the circular hole, and is fixed by two nuts.

[0011] Preferably, the holding member includes a holding rod slidably plugged into the right end of the mounting sleeve, the left end of the holding rod extends into the inner part of the mounting sleeve and is fixed with a linkage plate, the right end of the driving seat is provided with a linkage groove, the left end of the linkage groove is provided with a plug-in circular groove, the cross-sections of the linkage plate and the linkage groove are regular hexagonal structures, and the two have the same size, and the inner diameter of the plug-in circular groove is greater than the length of the linkage groove; A return spring is sleeved on the holding rod, and the left and right ends of the return spring are respectively in contact with the inner wall of the right side of the linkage plate and the mounting sleeve. When the linkage plate is in the linkage groove, the rotation of the holding rod and the linkage plate can cause the drive seat to rotate together, and then the movable screw can be rotated. At this time, the return spring is in a compressed state, which will apply a force to the linkage plate to move to the left, and the linkage plate has a tendency to move to the left. When the return spring is fully expanded, the linkage plate is inside the plug-in circular groove. At this time, the rotation of the linkage plate will not cause the drive seat and the movable screw to rotate.

[0012] Preferably, the driving mechanism includes a mounting cover fixed to the right end of the outer ring surface of the mounting sleeve, the mounting cover is connected to the driving groove inside the fixing frame, a main bevel gear is provided in the mounting cover, the main bevel gear is rotatably connected to the outer ring of the mounting sleeve through a bearing, the main bevel gear is meshed with the driving bevel gear, and an annular notch of an annular structure is opened on the right side surface of the mounting cover; A sleeve ring is rotatably installed on the outer right end of the mounting sleeve, and the sleeve ring is slidably and rotatably sleeved on the holding rod. Four groups of evenly distributed connecting rods are fixed on the right side surface of the main bevel gear, and the other end of the connecting rod passes through the annular notch and is fixed to the outer ring surface of the sleeve ring. The rotation of the main bevel gear can make the four driving bevel gears rotate synchronously, thereby making the rotating part rotate.

[0013] Preferably, the right end of the sleeve ring is provided with four annularly distributed connecting notches, and the outer ring surface of the gripping rod is welded with four groups of annularly distributed connecting blocks, and the four connecting notches correspond to the four connecting blocks one by one. When the linkage plate is in the linkage groove, the connecting block is away from the connecting notch. When the linkage plate contacts the left side wall of the plug-in circular groove, the connecting block is clamped into the connecting notch. When the movable screw is rotated by the holding rod, the holding rod is pulled to the right. When the linkage plate and the linkage groove are misaligned, the holding rod is slowly rotated to align the linkage plate and the linkage groove and clamp them to each other, and then the holding rod is rotated again.

[0014] Beneficial effects of the present invention: 1. By setting a center positioning mechanism and a positioning clamping mechanism, the center positioning mechanism can fix the tooling on the steel pipe and ensure that the center axis of the tooling is collinear with the center axis of the steel pipe. The positioning clamping mechanism can position and fix the flange to ensure that the center axis of the flange is collinear with the center axis of the tooling, thereby ensuring that the flange axis is collinear with the steel pipe axis, ensuring the coaxiality between the two, and facilitating subsequent welding; 2. The center positioning mechanism and positioning clamping mechanism in the fixture can be unfolded or folded accordingly as needed, which is convenient for carrying and can be used on some project construction sites. They can also be used for positioning steel pipes and flanges of various sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a main cross-sectional view of a workpiece welding positioning tool proposed by the present invention; Figure 2 This is a schematic diagram of the installation structure of a workpiece welding positioning fixture, a steel pipe, and a flange proposed by the present invention; Figure 3 for Figure 1 The left and right isometric drawings; Figure 4 for Figure 3 Schematic diagram of the structure of the moving screw, positioning clamping mechanism and center positioning mechanism; Figure 5 for Figure 3 Internal cross-sectional view of Figure 6 for Figure 5 A in the middle is an enlarged schematic diagram; Figure 7 for Figure 4 Schematic diagram of the structure of the central positioning clamping mechanism, driving mechanism and gripping member; Figure 8 for Figure 7 The left and right isometric drawings; Figure 9 for Figure 8 Schematic diagram of the internal structure of the central positioning clamping mechanism and the driving mechanism; Figure 10 An exploded view of the abutment frame in the positioning clamping mechanism; Figure 11 for Figure 7 Schematic cross-sectional view of ; Figure 12 for Figure 11 Enlarged schematic diagram of point B in the middle.

[0016] Reference numerals in the figure: 1, mounting sleeve; 11, adjusting slide hole; 2, center positioning mechanism; 21, abutting roller; 22, lifting deflection rod; 23, moving screw seat; 3, positioning clamping mechanism; 31, abutting frame; 311, deflection frame; 312, fixing frame; 313, lifting slide hole; 314, driving groove; 315, shaft seat; 32, positioning roller; 33, limiting member; 331, mounting plate; 332, pressing block; 333, nut; 334, threaded portion; 34, lifting member; 34 1. Lifting screw; 342. Rotating part; 35. Lifting screw seat; 36. Driving bevel gear; 4. Holding piece; 41. Holding rod; 42. Connecting block; 43. Return spring; 44. Linkage plate; 5. Driving mechanism; 51. Mounting cover; 511. Annular notch; 52. Main bevel gear; 53. Connecting rod; 54. Socket ring; 541. Connecting notch; 6. Moving screw; 61. Driving seat; 611. Inserting circular groove; 612. Linkage groove; 7. Flange; 8. Steel pipe. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Example Reference Figure 1 - Figure 12A workpiece welding positioning tool comprises a mounting sleeve 1, the interior of the mounting sleeve 1 is hollow and formed with a mounting cavity, a movable screw 6 is rotatably mounted inside the mounting cavity through a bearing, a driving seat 61 is fixed to the right end of the movable screw 6, the driving seat 61 is slidably connected to the mounting cavity, and a holding member 4 is movably connected inside the driving seat 61, the holding member 4 passes through the mounting sleeve 1 and is placed at the right end of the outside thereof, a center positioning mechanism 2 is provided on the outside of the mounting sleeve 1, and the center positioning mechanism 2 is connected to the movable screw 6; A positioning and clamping mechanism 3 is provided at the right end of the outer surface of the mounting sleeve 1. A driving mechanism 5 is installed on the right side of the outer ring surface of the mounting sleeve 1. The driving mechanism 5 is connected to the positioning and clamping mechanism 3, and the driving mechanism 5 is also connected to the holding member 4. A steel pipe 8 is sleeved on the outside of the mounting sleeve 1 , a flange 7 is installed on the right end of the steel pipe 8 , the inner wall of the steel pipe 8 abuts against the center positioning mechanism 2 , and the outer ring surface of the flange 7 abuts against the positioning clamping mechanism 3 .

[0019] Reference Figure 3 - Figure 6 The outer ring surface of the mounting sleeve 1 is provided with a plurality of groups of adjusting sliding holes 11 distributed in an annular shape, and the adjusting sliding holes 11 are communicated with the mounting cavity inside the mounting sleeve 1; The center positioning mechanism 2 includes two symmetrically distributed moving screw seats 23, which are respectively threadedly mounted on the left and right ends of the moving screw 6. Four sets of evenly distributed lifting and deflecting rods 22 are rotatably mounted on the outer ring surfaces of the two moving screw seats 23 via axle pins. An abutment roller 21 is rotatably connected between the two lifting and deflecting rods 22 corresponding to the two moving screw seats 23 via axle pins. The abutment roller 21 is tightly pressed against the inner wall of the steel pipe 8. The spiral lines in the left and right moving screw seats 23 rotate in opposite directions. The shaft pin on the movable screw seat 23 and the inner end part of the lifting deflection rod 22 are both slidably placed in the adjustment slide hole 11. When the movable screw 6 rotates in the forward direction, the two movable screw seats 23 can approach each other, thereby causing the four abutment rollers 21 to move away from each other, and the outer diameter of the circular structure formed by the four abutment rollers 21 increases. When the movable screw 6 rotates in the reverse direction, the two movable screw seats 23 move away from each other, the four abutment rollers 21 move closer to each other, and the outer diameter of the circular structure formed by the four abutment rollers 21 decreases. By rotating the movable screw 6, the four abutment rollers 21 can be moved away from or closer to each other, thereby being suitable for the installation and positioning of steel pipes 8 of various sizes.

[0020] Reference Figure 3 - Figure 9 The positioning and clamping mechanism 3 includes a plurality of abutment frames 31 distributed in a circumferential array on the right side of the outer ring surface of the mounting sleeve 1. The abutment frames 31 are formed with lifting sliding holes 313 at the front and rear sides. A lifting member 34 is rotatably installed in the lifting sliding hole 313 through a bearing. A lifting screw seat 35 is slidably installed in the lifting sliding hole 313. The lifting screw seat 35 is connected to the lifting member 34. A shaft is fixed to the left end of the lifting screw seat 35, and a positioning roller 32 is rotatably installed on the shaft. The four positioning rollers 32 are all in contact with the outer ring surface of the flange 7, and the right side surface of the flange 7 is in contact with the right side surface of the abutment frame 31. A limiting member 33 is also installed on the end of the positioning roller 32 away from the abutment frame 31.

[0021] Reference Figure 6 - Figure 12 The abutment frame 31 includes a fixing frame 312 fixed to the right side of the outer ring surface of the mounting sleeve 1. The deflection frame 311 is rotatably mounted on the fixing frame 312 through a rotating pin and a shaft seat 315. A lifting slide hole 313 is provided on the deflection frame 311, and a driving groove 314 is formed in the internal cavity of the fixing frame 312. The lifting member 34 includes a lifting screw 341 rotatably installed in the lifting slide hole 313 through a bearing, the lifting screw seat 35 is threadedly connected to the lifting screw 341, and a rotating part 342 is rotatably installed on the fixed frame 312 through a bearing, and the rotating part 342 is close to the lifting screw 341. One end of the rotating part 342 is connected to the lifting screw 341 through a universal joint, and the end of the rotating part 342 close to the mounting sleeve 1 extends into the driving groove 314, and the part of the rotating part 342 extending into the driving groove 314 is installed with a driving bevel gear 36, which divides the abutment frame 31 into two parts: a deflection frame 311 and a fixed frame 312, and the lifting member 34 is divided into two parts: a lifting screw 341 and a rotating part 342. The deflection frame 311 and the lifting screw 341 can be flipped and folded by the rotating pin and the axis of the universal joint, which can reduce the overall volume of the tooling fixture and facilitate carrying and placement.

[0022] Reference Figure 10 - Figure 12 The right half of the upper end of the shaft seat 315 is designed to have a horizontal structure to form a flat surface. When the deflection frame 311 is parallel to the fixed frame 312, the flat surface contacts the surface of the deflection frame 311 on the side close to the fixed frame 312. At this time, the deflection frame 311 cannot continue to deflect to the right, and the deflection frame 311 can be limited so that its maximum deflection angle is 90 degrees. When the lifting screw seat 35 is at the top or bottom end of the lifting slide hole 313, the axis of the shaft seat 315 is collinear with the universal joint axis of the rotating part 342. At this time, when the deflection frame 311 is folded, the lifting screw 341 can also be folded together. When there is a certain angle between the two, deflection and folding cannot be performed.

[0023] The left end of the shaft on the positioning roller 32 is designed to be extended, and the left end of the shaft is designed to have a threaded portion 334. The limiting member 33 includes two nuts 333 threadedly connected to the threaded portion 334. A mounting plate 331 is pressed between the two nuts 333. A pressing block 332 is fixed to the right side of the mounting plate 331. The inward half of the surface of the pressing block 332 away from the mounting plate 331 is designed with an inclined surface. The pressing block 332 abuts against the left surface of the flange 7. The flange 7 is placed between the inclined surfaces of the four pressing blocks 332, which can limit its position and prevent it from separating from the limiting member 33 and the positioning roller 32. When they approach each other, the inclined surface of the pressing block 332 will abut against the flange 7 and cause it to move toward the right surface of the deflection frame 311 until the two are in contact with each other. A circular hole is provided on the mounting plate 331, and the mounting plate 331 is sleeved on the threaded portion 334 through the circular hole and fixed by two nuts 333. The positions of the clamping plate 332 and the mounting plate 331 can be adjusted as needed, thereby being suitable for clamping and fixing flanges 7 of various thicknesses.

[0024] Reference Figure 6 - Figure 9 The holding member 4 includes a holding rod 41 that is slidably inserted into the right end of the mounting sleeve 1. The left end of the holding rod 41 extends into the inner part of the mounting sleeve 1 and is fixed with a linkage plate 44. The right end of the driving seat 61 is provided with a linkage groove 612, and the left end of the linkage groove 612 is provided with a plug-in circular groove 611. The cross-sections of the linkage plate 44 and the linkage groove 612 are regular hexagonal structures, and the two have the same size. The inner diameter of the plug-in circular groove 611 is greater than the length of the linkage groove 612. A return spring 43 is sleeved on the holding rod 41. The left and right ends of the return spring 43 are respectively in contact with the linkage plate 44 and the right inner wall of the mounting sleeve 1. When the linkage plate 44 is in the linkage groove 612, the rotation of the holding rod 41 and the linkage plate 44 can cause the drive seat 61 to rotate together, thereby causing the movable screw 6 to rotate. At this time, the return spring 43 is in a compressed state, which will apply a force to the linkage plate 44 to move leftward, and the linkage plate 44 has a tendency to move leftward. When the return spring 43 is fully extended, the linkage plate 44 is located inside the insertion groove 611 . At this time, the rotation of the linkage plate 44 will not cause the drive seat 61 and the movable screw 6 to rotate.

[0025] Reference Figure 5 - Figure 12The driving mechanism 5 includes a mounting cover 51 fixed to the right end of the outer ring surface of the mounting sleeve 1. The rear end of the mounting cover 51 is designed to be open. The rear end opening of the mounting cover 51 is connected to the internal driving groove 314 of the fixing frame 312. A main bevel gear 52 is provided in the mounting cover 51. The main bevel gear 52 is rotatably connected to the outer ring of the mounting sleeve 1 through a bearing. The main bevel gear 52 is engaged with the driving bevel gear 36. An annular notch 511 of an annular structure is opened on the right side surface of the mounting cover 51. A sleeve ring 54 is rotatably mounted on the right end of the outer portion of the mounting sleeve 1. The sleeve ring 54 is slidably and rotatably sleeved on the gripping rod 41. Four sets of evenly distributed connecting rods 53 are fixed to the right side surface of the main bevel gear 52. The other ends of the connecting rods 53 pass through the annular notches 511 and are fixed to the outer surface of the sleeve ring 54. The rotation of the main bevel gear 52 can make the four driving bevel gears 36 rotate synchronously, and then make the rotating part 342 rotate. The rotating rotating part 342 will make the lifting screw 341 rotate synchronously, and then make the lifting screw seat 35 move accordingly in the lifting slide hole 313. The positioning roller 32 can move therewith and clamp and position the flange 7 between the four positioning rollers 32, and is suitable for positioning flanges 7 of various sizes.

[0026] The right end of the sleeve ring 54 is provided with four annularly distributed connecting notches 541. The outer surface of the gripping rod 41 is welded with four groups of annularly distributed connecting blocks 42. The four connecting notches 541 correspond to the four connecting blocks 42 one by one. When the linkage plate 44 is in the linkage groove 612, the connecting block 42 is away from the connecting notch 541. When the linkage plate 44 contacts the left side wall of the plug-in circular groove 611, the connecting block 42 is snapped into the connecting notch 541. When the movable screw 6 is rotated by the gripping rod 41, the gripping rod 41 is pulled to the right. When the linkage plate 44 and the linkage groove 612 are misaligned, the gripping rod 41 is slowly rotated to align the linkage plate 44 with the linkage groove 612 and snap into contact with each other. Then, the gripping rod 41 is rotated again. When the lifting screw 341 is rotated by the holding rod 41, when the holding rod 41 is not pulled to the right, the holding rod 41 will automatically move to the left under the action of the return spring 43. When the connecting block 42 contacts the right side surface of the sleeve ring 54, the holding rod 41 is rotated to align the connecting block 42 with the connecting notch 541, and the connecting block 42 is snapped into the connecting notch 541. Thereafter, the holding rod 41 is rotated to rotate the sleeve ring 54 and the main bevel gear 52, thereby enabling the four lifting screws 341 to rotate synchronously.

[0027] Working principle: When welding the flange 7 onto the steel pipe 8 (the figure takes the flange 7 welded on the right side of the steel pipe 8 as an example), when the flange 7 is sleeved on the right side of the outer ring of the steel pipe 8 and welded, first sleeve the flange 7 onto the steel pipe 8, and then install the tooling on the right end inside the steel pipe 8; Specifically, first, the four deflection frames 311 are unfolded to the maximum extent. At this time, the flat surface of the shaft seat 315 contacts the surface of the deflection frame 311 close to the fixed frame 312, and the four surfaces of the deflection frame 311 are flush with the four surfaces of the fixed frame 312. Figure 1 As shown), the mounting sleeve 1 and the center positioning mechanism 2 are inserted into the interior of the steel pipe 8, and the left surfaces of the four deflection frames 311 are in contact with the right end surface of the steel pipe 8; Then pull the holding rod 41 to the right, and make the linkage plate 44 on the holding rod 41 snap into the linkage groove 612 of the driving seat 61, and then rotate the holding rod 41 forward. Since the linkage plate 44 and the linkage groove 612 are regular hexagonal structures, the forward rotating holding rod 41 will make the driving seat 61 and the moving screw 6 rotate together. When the moving screw 6 rotates forward, the two moving screw seats 23 will approach each other, thereby making the four abutment rollers 21 move away from each other. The outer diameter of the circular structure formed by the four abutment rollers 21 increases until the four abutment rollers 21 contact the inner wall of the steel pipe 8. At this time, the fixing of the positioning tool is completed, and the axis of the tool is collinear with the axis of the steel pipe 8. Then, the holding rod 41 is moved to the left and the connecting block 42 is engaged with the connecting notch 541. Then, the holding rod 41 is rotated in the forward direction. At this time, the rotation of the holding rod 41 and the linkage plate 44 can rotate the sleeve ring 54. The sleeve ring 54 is connected to the main bevel gear 52 via the connecting rod 53, which can thereby rotate the main bevel gear 52. The rotation of the main bevel gear 52 can make the four driving bevel gears 36 rotate synchronously, which can make the rotating part 342 rotate. The rotating rotating part 342 will make the lifting screw 341 rotate synchronously, which can make the lifting screw seat 35 move inward in the lifting slide hole 313, and the positioning roller 32 can move therewith, so that the circular structure formed by the four pressing blocks 332 is slightly larger than the outer diameter of the flange 7. Then move the flange 7 to the right so that the flange 7 is between the four clamping blocks 332 and the positioning rollers 32, and make the right side of the flange 7 contact the left surface of the deflection frame 311, and then continue to rotate the holding rod 41, and the four positioning rollers 32 approach each other to clamp and position the flange 7. At this time, the axis of the flange 7 is collinear with the axis of the steel pipe 8, and finally make the left surface of the deflection frame 311 contact the left surface of the steel pipe 8, and then the flange 7 can be spot welded and fully welded.

[0028] When the flange 7 abuts against the right side of the steel pipe 8 and is welded, the flange 7 is first fixed between the four positioning rollers 32, and then the tool is fixed to the steel pipe 8 through the center positioning mechanism 2, and the flange 7 is fit to the right side surface of the steel pipe 8.

[0029] During folding, the movable screw 6 is rotated in the opposite direction so that the two movable screw seats 23 move away from each other, thereby shrinking the contact roller 21. Then, the sleeve ring 54 is rotated so that the lifting screw seat 35 is at the farthest end of the lifting slide hole 313. At this time, the axis of the shaft seat 315 is collinear with the universal joint axis of the rotating part 342. When the deflection frame 311 is folded, the lifting screw 341 can also be folded together.

[0030] By providing a center positioning mechanism 2 and a positioning and clamping mechanism 3, the center positioning mechanism 2 can fix the tool on the steel pipe 8 and ensure that the center axis of the tool is collinear with the center axis of the steel pipe 8, while the positioning and clamping mechanism 3 can position and fix the flange 7, ensuring that the center axis of the flange 7 is collinear with the center axis of the tool, thereby ensuring that the axis of the flange 7 is collinear with the axis of the steel pipe 8, ensuring the coaxiality between the two, and facilitating subsequent welding; The center positioning mechanism 2 and the positioning clamping mechanism 3 in the tooling fixture can be unfolded or folded accordingly as needed, making it easy to carry and use at some project construction sites. They can also be suitable for positioning steel pipes 8 and flanges 7 of various sizes.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0033] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A workpiece welding positioning tool, characterized in that: The invention comprises a mounting sleeve (1), wherein the mounting sleeve (1) is hollow inside and has a mounting cavity, wherein a movable screw (6) is rotatably mounted inside the mounting cavity via a bearing, a driving seat (61) is fixed to the right end of the movable screw (6), the driving seat (61) is slidably connected to the mounting cavity, and a holding member (4) is movably connected inside the driving seat (61), the holding member (4) passes through the mounting sleeve (1) and is placed at the right end of the outside thereof, and a center positioning mechanism (2) is provided outside the mounting sleeve (1), and the center positioning mechanism (2) is connected to the movable screw (6); A positioning clamping mechanism (3) is provided at the outer right end of the mounting sleeve (1), and a driving mechanism (5) is installed on the right side of the outer ring surface of the mounting sleeve (1). The driving mechanism (5) is connected to the positioning clamping mechanism (3), and the driving mechanism (5) is also connected to the holding member (4); The outer portion of the mounting sleeve (1) is sleeved with a steel pipe (8), the right end of the steel pipe (8) is mounted with a flange (7), the inner wall of the steel pipe (8) abuts against the center positioning mechanism (2), and the outer ring surface of the flange (7) abuts against the positioning clamping mechanism (3).

2. A workpiece welding positioning fixture according to claim 1, characterized in that: The outer ring surface of the mounting sleeve (1) is provided with a plurality of groups of adjusting sliding holes (11) distributed in an annular shape, and the adjusting sliding holes (11) are communicated with the internal mounting cavity of the mounting sleeve (1); The center positioning mechanism (2) includes two symmetrically distributed moving screw seats (23), the two moving screw seats (23) are respectively threadedly installed on the left and right ends of the moving screw (6), and the outer ring surfaces of the two moving screw seats (23) are respectively installed with four groups of evenly distributed lifting and deflecting rods (22) through axle pin rotation. The two corresponding lifting and deflecting rods (22) on the two moving screw seats (23) are connected to an abutment roller (21) through axle pin rotation, and the abutment roller (21) is tightly pressed against the inner wall of the steel pipe (8).

3. A workpiece welding positioning fixture according to claim 1, characterized in that: The positioning and clamping mechanism (3) includes a plurality of abutment frames (31) distributed in a circumferential array on the right side of the outer ring surface of the mounting sleeve (1), the abutment frames (31) are formed with lifting slide holes (313) through the front and rear, a lifting member (34) is rotatably installed in the lifting slide hole (313) through a bearing, a lifting screw seat (35) is slidably installed in the lifting slide hole (313), and the lifting screw seat (35) is connected to the lifting member (34); A shaft is fixed to the left end of the lifting screw seat (35), and a positioning roller (32) is rotatably mounted on the shaft. The four positioning rollers (32) are all in contact with the outer ring surface of the flange (7), and the right side surface of the flange (7) is in contact with the right side surface of the abutment frame (31). A limiting member (33) is also installed on the end of the positioning roller (32) away from the abutment frame (31).

4. A workpiece welding positioning fixture according to claim 3, characterized in that: The abutment frame (31) includes a fixed frame (312) fixed to the right side of the outer ring surface of the mounting sleeve (1); a deflection frame (311) is rotatably mounted on the fixed frame (312) via a rotating pin and a shaft seat (315); the lifting slide hole (313) is provided on the deflection frame (311); and a driving groove (314) is formed in the internal cavity of the fixed frame (312); The lifting member (34) includes a lifting screw (341) rotatably mounted in a lifting slide hole (313) via a bearing, the lifting screw seat (35) is threadedly connected to the lifting screw (341), a rotating portion (342) is rotatably mounted on the fixing frame (312) via a bearing, an end of the rotating portion (342) close to the lifting screw (341) is rotatably connected to the lifting screw (341) via a universal joint, an end of the rotating portion (342) close to the mounting sleeve (1) extends into the driving groove (314), and a driving bevel gear (36) is installed on the portion of the rotating portion (342) extending into the driving groove (314).

5. A workpiece welding positioning fixture according to claim 4, characterized in that: The right half of the upper end of the shaft seat (315) is designed to have a horizontal structure to form a plane portion, and when the deflection frame (311) is parallel to the fixed frame (312), the plane portion contacts the surface of the deflection frame (311) close to the fixed frame (312); When the lifting screw seat (35) is at the top or bottom end of the lifting slide hole (313), the axis of the shaft seat (315) is collinear with the universal joint axis of the rotating part (342).

6. A workpiece welding positioning fixture according to claim 5, characterized in that: The left end of the shaft on the positioning roller (32) is designed to be extended, and the left end of the shaft is designed to have a threaded portion (334). The limiting member (33) includes two nuts (333) threadedly connected to the threaded portion (334). A mounting plate (331) is pressed between the two nuts (333). A clamping block (332) is fixed to the right side of the mounting plate (331). The inward half of the surface of the clamping block (332) away from the mounting plate (331) is designed to be inclined. The clamping block (332) abuts against the left surface of the flange (7).

7. A workpiece welding positioning fixture according to claim 4, characterized in that: The holding member (4) includes a holding rod (41) slidably plugged into the right end of the mounting sleeve (1), the left end of the holding rod (41) extends into the inner part of the mounting sleeve (1) and is fixed with a linkage plate (44), the right end of the driving seat (61) is provided with a linkage groove (612), the left end of the linkage groove (612) is provided with a plug-in circular groove (611), the cross-sections of the linkage plate (44) and the linkage groove (612) are regular hexagonal structures, and the two have the same size, and the inner diameter of the plug-in circular groove (611) is greater than the length of the linkage groove (612); A return spring (43) is sleeved on the holding rod (41), and the left and right ends of the return spring (43) respectively abut against the linkage plate (44) and the right inner wall of the mounting sleeve (1).

8. A workpiece welding positioning fixture according to claim 7, characterized in that: The driving mechanism (5) includes a mounting cover (51) fixed to the right end of the outer ring surface of the mounting sleeve (1), the mounting cover (51) is connected to the driving groove (314) inside the fixing frame (312), a main bevel gear (52) is provided in the mounting cover (51), the main bevel gear (52) is rotatably connected to the outer ring of the mounting sleeve (1) through a bearing, the main bevel gear (52) is meshed with the driving bevel gear (36), and an annular notch (511) of an annular structure is opened on the right side surface of the mounting cover (51); A sleeve ring (54) is rotatably mounted on the outer right end of the mounting sleeve (1), and the sleeve ring (54) is slidably and rotatably sleeved on the holding rod (41). Four groups of evenly distributed connecting rods (53) are fixed to the right side surface of the main bevel gear (52), and the other ends of the connecting rods (53) pass through the annular notch (511) and are fixed to the outer ring surface of the sleeve ring (54).

9. The workpiece welding positioning fixture according to claim 8, characterized in that: The right end of the sleeve ring (54) is provided with four annularly distributed connecting notches (541), and the outer ring surface of the holding rod (41) is welded with four groups of annularly distributed connecting blocks (42), and the four connecting notches (541) correspond to the four connecting blocks (42) one by one. When the linkage plate (44) is in the linkage groove (612), the connection block (42) is away from the connection notch (541); when the linkage plate (44) contacts the left side wall of the plug-in circular groove (611), the connection block (42) is snapped into the connection notch (541).

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