A size head and flange welding positioning tool

Abstract

The utility model discloses a big head and flange welding positioning frock, including work table, the top of work table is installed with support column, both sides top of support column all are connected with the arc clamping plate for flange clamping and sliding, the inside of support column is provided with the moving piece of two groups arc clamping plate that move inwards simultaneously, the top center of support column is provided with the fixed part for the fixed big head, the bottom of work table is provided with the rotating part for rotating support column according to need, the utility model discloses through the setting of fixed part and pusher and moving piece, moving piece moves inwards simultaneously two groups arc clamping plate, realizes the stable clamping of flange, and more can pass through fixed part and reliably fixed big head that is connected with flange, thereby avoids the problem that big head can not be fixed and leads to easy rotation around the axis or along the conical surface sliding, makes the position fixed of big head and flange when welding, thereby guarantees the concentricity of both.

Description

Technical Field

[0001] This utility model relates to the technical field of welding positioning fixtures for reducers and flanges, specifically a welding positioning fixture for reducers and flanges. Background Technology

[0002] In piping systems, due to changes in flow rate, pressure adjustment, or process requirements, it is often necessary to connect pipes of different diameters. The core function of a reducer is to smoothly connect two pipes of different diameters through a gradual or abrupt change in structure, reducing fluid resistance and avoiding local eddies or pressure loss. Furthermore, a flange needs to be welded to one end of the reducer to connect it to the pipeline.

[0003] Currently, Chinese patent CN221134644U discloses a flange welding positioning fixture, including a processing table. Multiple slide rails are fixedly connected to the top outer wall of the processing table, and these slide rails are evenly distributed in a circular array on the top outer wall of the processing table. A slider is slidably connected to the outer wall of each slide rail, and a fixing plate is fixedly connected to the top outer wall of the slider. Positioning posts are fixedly connected above the ends of the fixing plates away from the sliders. A positioning assembly is installed on the bottom outer wall of the processing table to drive the multiple positioning posts to move synchronously. In this invention, the flange is positioned by inserting multiple holes into the outer walls of the multiple positioning posts. Then, the positioning assembly drives the multiple positioning posts to expand outward synchronously, supporting the holes inward, thereby completely fixing the flange before welding.

[0004] The aforementioned flange welding positioning fixture has some problems in actual use. It cannot fix the reducer connected to the flange. Therefore, if it is subjected to external force during the welding process, the reducer is prone to rotate around the axis or slide along the conical surface, resulting in a relative positional shift with the flange and disrupting concentricity. Utility Model Content

[0005] The purpose of this utility model is to provide a welding and positioning fixture for reducers and flanges to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A welding and positioning fixture for reducing heads and flanges includes a worktable, a support column mounted on the top of the worktable, and arc-shaped clamping plates for clamping the flange slidably connected to the top of both sides of the support column. The support column is provided with a moving part that moves two sets of arc-shaped clamping plates inward simultaneously. A fixing part for fixing the reducing head is provided at the top center of the support column. A rotating part for rotating the support column as needed is provided at the bottom of the worktable surface. The fixing component includes a positioning seat fixedly installed at the center of the top of the support column. A rectangular groove is provided on the front side of the positioning seat along the height. Positioning plates are provided on the front and rear sides of the positioning seat and at the corresponding side openings of the rectangular groove. The bottoms of the two sets of positioning plates are respectively set on the top of the corresponding side of the support column through sliding connectors. The inner cavity of the rectangular groove is provided with pushers that push the positioning plates outward to position the large and small ends.

[0007] As a preferred technical solution, the pushing component includes a bidirectional lead screw rotatably connected to the inner cavity of a rectangular groove. Both ends of the bidirectional lead screw are threadedly connected to threaded seats. The two sides of the two sets of threaded seats are respectively connected to connecting bars through a first rotating connector. The two sets of connecting bars on the same side are respectively rotatably connected to the corresponding side positioning plate through a second rotating connector. The end of the bidirectional lead screw passes upward through the positioning seat and is fixedly connected to a transmission rod. The end of the transmission rod is fixedly connected to a handwheel. The first rotating connector includes an adapter rod that is rotatably inserted into the inner end of each set of connecting bars. Each set of adapter rods has a connecting piece rotatably sleeved at both ends. The ends of the two sets of connecting pieces on the same side are respectively fixedly connected to the corresponding position surfaces of the corresponding threaded seats. The second rotating connector includes a rotating rod that is rotatably inserted into the outer end of each set of connecting bars. The two ends of the rotating rod are respectively fitted with fixing plates, and the four sets of fixing plates on the same side are respectively fixedly connected to the surface of the corresponding side positioning plate.

[0008] As a preferred technical solution, a positioning ring is fixedly installed on the top of the positioning seat and at a position corresponding to the outer circular surface of the transmission rod. A positioning bolt is threadedly connected to one side of the positioning ring, and the end of the positioning bolt is threaded through the positioning ring and abuts against the surface of the transmission rod.

[0009] As a preferred technical solution, the movable component includes mounting slots respectively opened on the top of the left and right sides of the support column. A dual-head motor is embedded inside the support column. The inner cavities of the two sets of mounting slots are rotatably connected to lead screws. The threads of the two sets of lead screws are arranged in opposite directions. The two sets of output shafts of the dual-head motor extend to the inner cavity of the corresponding side mounting slot and are keyed together at the ends of the corresponding side lead screws. Nut seats are threadedly connected to the surfaces of the two sets of lead screws. The tops of the two sets of nut seats are respectively connected to the bottoms of the corresponding side arc-shaped clamps.

[0010] As a preferred technical solution, the rotating component includes a mounting bracket disposed at the bottom of the workbench surface. A worm gear is rotatably connected to the inner cavity of the mounting bracket. The worm's wheel axis passes through the workbench surface upward and is fixedly connected to the center of the bottom of the support column. A worm is meshed with the tooth surface of the worm gear. Bearing seats are respectively sleeved at both ends of the worm. The tops of the two sets of bearing seats are respectively fixedly connected to the bottom of the workbench surface. One end of the worm extends towards the front of the workbench and is fixedly connected to a rotating disk.

[0011] As a preferred technical solution, the sliding connector includes guide strips that are fixedly installed at the bottom of each group of positioning plates, and guide grooves are provided on the top of the front and rear sides of the support column. The ends of the two groups of guide strips are slidably connected to the inner cavity of the corresponding side guide grooves.

[0012] As a preferred technical solution, folding curtains are fixedly installed on the upper parts of both sides of the two sets of nut seats, and the other end of each set of folding curtains is fixedly connected to the inner wall of the corresponding position of the corresponding side mounting groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the setting of a fixing component, a pushing component, and a moving component, allows the moving component to simultaneously move two sets of arc-shaped clamping plates inward, thereby achieving stable clamping of the flange. Furthermore, the fixing component can reliably fix the reducer connected to the flange, thus avoiding the problem of easy rotation around the axis or sliding along the conical surface caused by the inability to fix the reducer. This ensures that the position of the reducer and the flange is fixed during welding, thus guaranteeing their concentricity.

[0014] 2. This utility model, through the setting of the pushing component, adopts a structure of bidirectional lead screw, threaded seat, connecting bar and rotating connecting component. It can realize the synchronous reverse movement of two sets of positioning plates through handwheel drive, forming a uniform clamping force on the reducer, ensuring the relative position stability of the reducer and flange, avoiding the displacement caused by external force during welding. In addition, the setting of the first rotating connecting component and the second rotating connecting component makes the movement transmission between the components smoother, reduces mechanical wear, improves the stability and flexibility of the fixing operation, facilitates the quick completion of the positioning and fixing of the reducer, and ensures the concentricity with the flange.

[0015] 3. By setting up positioning rings and positioning bolts, this utility model can effectively limit the rotation of the transmission rod after the fixing component completes the positioning of the reducer, preventing the bidirectional screw from loosening due to external force or vibration. This ensures that the positioning plate is always stable and reliable in fixing the reducer, avoiding displacement of the reducer during welding, further ensuring the relative position accuracy and concentricity of the reducer and flange, and improving the safety of the device during operation. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of a welding and positioning fixture for reducing heads and flanges according to this utility model; Figure 2 This is a structural schematic diagram of the present invention viewed from below; Figure 3 This is a cross-sectional structural diagram of the support column of this utility model; Figure 4 This is a cross-sectional view of the positioning seat of this utility model.

[0017] In the picture: 100. Workbench; 101. Rotary disc; 102. Mounting bracket; 103. Worm gear; 104. Worm; 105. Bearing housing; 200. Support column; 201. Arc-shaped clamp; 202. Mounting groove; 203. Nut seat; 204. Lead screw; 205. Double-headed motor; 206. Folding curtain; 300. Positioning seat; 301. Positioning plate; 302. Guide bar; 303. Guide groove; 304. Positioning bolt; 305. Positioning ring; 306. Rectangular groove; 307. Double-acting lead screw; 400. Handwheel; 401. Transmission rod; 402. Threaded seat; 403. Connecting bar; 404. Rotating rod; 405. Fixing plate; 406. Adapter rod; 407. Connecting plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 This embodiment provides a welding and positioning fixture for reducing heads and flanges, including a workbench 100. A support column 200 is installed on the top of the workbench 100. Arc-shaped clamping plates 201 for clamping the flange are slidably connected to the top of both sides of the support column 200. A moving part is provided inside the support column 200 to move two sets of arc-shaped clamping plates 201 inward at the same time. A fixing part for fixing the reducing head is provided at the top center of the support column 200. A rotating part is provided at the bottom of the workbench 100 for rotating the support column 200 as needed. The fixing component includes a positioning seat 300 fixedly installed at the center of the top of the support column 200. The front side of the positioning seat 300 has a rectangular groove 306 that extends along its height. Positioning plates 301 are provided on both the front and rear sides of the positioning seat 300 and at the corresponding side openings of the rectangular groove 306. The bottoms of the two sets of positioning plates 301 are respectively set on the top of the corresponding side of the support column 200 through sliding connectors. The inner cavity of the rectangular groove 306 is provided with a pushing component that pushes the positioning plates 301 outward to position the reducer. Through the setting of the fixing component, the pushing component, and the moving component, the moving component moves the two sets of arc-shaped clamping plates 201 inward at the same time to achieve stable clamping of the flange. Furthermore, the fixing component can reliably fix the reducer connected to the flange, thereby avoiding the problem of easy rotation around the axis or sliding along the conical surface caused by the reducer not being fixed. This ensures that the position of the reducer and the flange is fixed during welding, thus guaranteeing their concentricity.

[0020] The pusher includes a bidirectional lead screw 307 rotatably connected to the inner cavity of the rectangular groove 306. Both ends of the bidirectional lead screw 307 are threadedly connected to threaded seats 402. The two sides of the two sets of threaded seats 402 are respectively connected to connecting strips 403 through first rotating connectors. The two sets of connecting strips 403 on the same side are rotatably connected to the corresponding side positioning plate 301 through second rotating connectors. The end of the bidirectional lead screw 307 passes upward through the positioning seat 300 and is fixedly connected to a transmission rod 401. The end of the transmission rod 401 is fixedly connected to a handwheel 400. The first rotating connector includes a converter rod 406 that is rotatably inserted into the inner end of each set of connecting bars 403. Each set of converter rods 406 has a connecting piece 407 rotatably sleeved at both ends. The ends of the two sets of connecting pieces 407 on the same side are respectively fixedly connected to the corresponding position surfaces of the corresponding threaded seat 402. The second rotating connector includes a rotating rod 404 rotatably inserted into the outer end of each set of connecting bars 403. Fixed plates 405 are rotatably sleeved at both ends of the rotating rod 404. Four sets of fixed plates 405 on the same side are fixedly connected to the surface of the corresponding side positioning plate 301. Through the setting of the pushing component, and using a bidirectional lead screw 307 in conjunction with the threaded seat 402, connecting bars 403, and rotating connector, the synchronous reverse movement of the two sets of positioning plates 301 can be achieved by driving with a handwheel 400. This creates a uniform clamping force on the reducer, ensuring the relative position of the reducer and flange is stable and preventing displacement caused by external forces during welding. Furthermore, the setting of the first and second rotating connectors makes the movement transmission between components smoother, reduces mechanical wear, improves the stability and flexibility of the fixing operation, facilitates quick positioning and fixing of the reducer, and ensures concentricity with the flange.

[0021] A positioning ring 305 is fixedly installed on the top of the positioning seat 300 at a position corresponding to the outer circular surface of the transmission rod 401. A positioning bolt 304 is threadedly connected to one side of the positioning ring 305. The end thread of the positioning bolt 304 passes through the positioning ring 305 and abuts against the surface of the transmission rod 401. Through the setting of the positioning ring 305 and the positioning bolt 304, the rotation of the transmission rod 401 can be effectively restricted after the fixing component completes the positioning of the reducer. This prevents the bidirectional lead screw 307 from loosening due to external force or vibration, thereby ensuring that the positioning plate 301 is always stable and reliable in fixing the reducer, avoiding displacement of the reducer during welding, further ensuring the relative position accuracy and concentricity of the reducer and flange, and improving the safety of the device during operation.

[0022] The movable component includes mounting slots 202 respectively opened on the top of the left and right sides of the support column 200. A dual-head motor 205 is embedded inside the support column 200. The inner cavities of the two sets of mounting slots 202 are rotatably connected to lead screws 204. The threads of the two sets of lead screws 204 are arranged in opposite directions. The two output shafts of the dual-head motor 205 extend to the inner cavity of the corresponding side mounting slot 202 and are keyed to the end of the corresponding side lead screw 204. Nut seats 203 are threadedly connected to the surface of the two sets of lead screws 204. The top of the two sets of nut seats 203 are connected to the bottom of the corresponding side arc-shaped clamping plate 201. Through the arrangement of the movable component, the dual-head motor 205 drives the two sets of lead screws 204 with opposite threads, which can drive the nut seats 203 and the arc-shaped clamping plate 201 to move inward or outward synchronously, ensuring that the clamping force on the flange is uniform and symmetrical, improving the stability and accuracy of flange clamping. The motor drive replaces manual operation, improving clamping efficiency and reducing the intensity of manual operation.

[0023] The rotating component includes a mounting bracket 102 located at the bottom of the workbench 100. A worm gear 103 is rotatably connected to the inner cavity of the mounting bracket 102. The worm gear 103's axial direction extends upward through the workbench 100 and is fixedly connected to the center of the bottom of the support column 200. A worm 104 meshes with the teeth of the worm gear 103. Bearing seats 105 are respectively fitted at both ends of the worm 104. The tops of the two sets of bearing seats 105 are fixedly connected to the bottom of the workbench 100. One end of the worm 104 extends towards the front of the workbench 100 and is fixedly connected to a rotating disk 101. The rotating component... The rotating disk 101 drives the worm gear 104 to rotate the worm wheel 103 and the support column 200. This not only allows for flexible adjustment of the workpiece angle to meet different operating position requirements, but also ensures that the worm wheel 103 and worm gear 104 have a self-locking characteristic, which allows the support column 200 to maintain the current angle after adjustment. This makes it easy for workers to weld the reducer to the flange along the bottom of the reducer without clamping the flange or reducer. At the same time, it avoids relative positional shifts between the reducer and flange due to accidental rotation, ensuring that they remain concentric before and after angle adjustment, thus improving the accuracy and reliability of angle adjustment.

[0024] The sliding connector includes guide strips 302 fixedly installed at the bottom of each set of positioning plates 301. Guide grooves 303 are provided on the top of the front and rear sides of the support column 200. The ends of the two sets of guide strips 302 are slidably connected to the inner cavity of the corresponding side guide grooves 303. Through the setting of the sliding connector, the cooperation between the guide strips 302 and the guide grooves 303 plays a guiding and limiting role in the movement of the positioning plate 301, preventing the positioning plate 301 from shifting or shaking during the movement, ensuring the linearity and stability of the movement of the positioning plate 301, thereby improving the positioning accuracy of the reducer, ensuring the concentricity of the reducer and the flange, and avoiding welding position errors caused by the offset of the positioning plate 301.

[0025] Among them, folding curtains 206 are fixedly installed on the upper part of both sides of the two sets of nut seats 203 respectively. The other end of each set of folding curtains 206 is fixedly connected to the inner wall of the corresponding position of the corresponding side mounting groove 202. With the setting of the folding curtains 206, the folding curtains 206 expand or retract synchronously with the movement of the nut seats 203, which can effectively block welding slag, dust and other debris from entering the interior of the mounting groove 202, and prevent the screw 204, nut seat 203 and other components from being contaminated by debris and affecting the movement accuracy.

[0026] Working principle; First, clamp the flange and start the double-headed motor 205 in the moving part. Its two sets of output shafts drive the lead screws 204 in the mounting slots 202 on both sides of the support column 200 to rotate. Since the threads of the lead screws 204 on both sides are opposite, the nut seats 203 on their surfaces will move synchronously inward or outward along the axial direction of the lead screws 204, thereby driving the arc-shaped clamping plate 201 connected at the top to move synchronously, so as to clamp the flange. At the same time, the folding curtains 206 on both sides of the nut seat 203 unfold or retract with the movement of the nut seat 203, which can protect the internal structure of the mounting groove 202 and prevent welding slag from falling into the mounting groove 202. Then, the reducer is fitted onto the outer surface of the positioning seat 300, and the handwheel 400 in the fixing component is rotated, which drives the bidirectional lead screw 307 in the rectangular groove 306 of the positioning seat 300 to rotate through the transmission rod 401. Since the threads at both ends of the bidirectional lead screw 307 are opposite, the two sets of thread seats 402 on its surface will move relatively closer or further away along the lead screw axis. Furthermore, the threaded seat 402, through the adapter rod 406 and the connecting piece 407, drives the connecting strip 403 to move. The other end of the connecting strip 403, through the rotating rod 404 and the fixing piece 405, pushes the positioning plates 301 on both sides to move. Thus, the guide strip 302 at the bottom of the positioning plate 301 slides along the guide groove 303 at the top of the support column 200, ensuring the stability of the movement. Finally, the two sets of positioning plates 301 move outward synchronously to achieve the clamping and positioning of the large and small heads. After the fixing is completed, tighten the positioning bolts 304 on the positioning ring 305 so that its end abuts against the surface of the transmission rod 401, restricting the rotation of the transmission rod 401 and ensuring a stable fixing state. When it is necessary to adjust the angle of the support column 200 and the fixed workpiece, the rotating disk 101 in the rotating component is operated to drive the worm 104 to rotate. The worm 104 meshes with the worm wheel 103 in the mounting bracket 102, converting the rotational motion of the worm 104 into the rotational motion of the worm wheel 103. The wheel axis of the worm wheel 103 transmits power upward, driving the support column 200 to rotate around its own axis, thereby realizing the adjustment of the workpiece angle.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding and positioning fixture for reducing heads and flanges, characterized in that, The system includes a workbench (100), on the top of which a support column (200) is mounted. Both sides of the top of the support column (200) are slidably connected to arc-shaped clamping plates (201) for clamping flanges. The support column (200) is provided with a moving part that moves two sets of arc-shaped clamping plates (201) inwards simultaneously. The center of the top of the support column (200) is provided with a fixing part for fixing the reducer. The bottom of the workbench (100) is provided with a rotating part for rotating the support column (200) as needed. The fixing component includes a positioning seat (300) fixedly installed at the center of the top of the support column (200). The front side of the positioning seat (300) is provided with a rectangular groove (306) arranged along the height. Positioning plates (301) are provided on the front and rear sides of the positioning seat (300) and at the corresponding side openings of the rectangular groove (306). The bottoms of the two sets of positioning plates (301) are respectively set on the top of the corresponding side of the support column (200) through sliding connectors. The inner cavity of the rectangular groove (306) is provided with pushers that push the positioning plates (301) outward to position the large and small ends.

2. The welding and positioning fixture for reducing heads and flanges according to claim 1, characterized in that: The pusher includes a bidirectional lead screw (307) rotatably connected to the inner cavity of a rectangular groove (306). Both ends of the bidirectional lead screw (307) are threadedly connected to thread seats (402). The two sides of the two sets of thread seats (402) are respectively connected to connecting strips (403) through a first rotating connector. The two sets of connecting strips (403) on the same side are rotatably connected to the corresponding side positioning plate (301) through a second rotating connector. The end of the bidirectional lead screw (307) passes upward through the positioning seat (300) and is fixedly connected to a transmission rod (401). The end of the transmission rod (401) is fixedly connected to a handwheel (400). The first rotating connector includes a converter rod (406) that is rotatably inserted into the inner end of each set of connecting bars (403). Each set of converter rods (406) has a connecting piece (407) rotatably sleeved at both ends. The ends of the two sets of connecting pieces (407) on the same side are respectively fixedly connected to the corresponding position surface of the corresponding side threaded seat (402). The second rotating connector includes a rotating rod (404) that is rotatably inserted into the outer end of each set of connecting bars (403). The two ends of the rotating rod (404) are respectively rotatably fitted with fixing plates (405). The four sets of fixing plates (405) on the same side are respectively fixedly connected to the surface of the corresponding side positioning plate (301).

3. The welding and positioning fixture for reducing heads and flanges according to claim 2, characterized in that: A positioning ring (305) is fixedly installed on the top of the positioning seat (300) and at a position corresponding to the outer circular surface of the transmission rod (401). A positioning bolt (304) is threadedly connected to one side of the positioning ring (305). The end of the positioning bolt (304) is threaded through the positioning ring (305) and abuts against the surface of the transmission rod (401).

4. The welding and positioning fixture for reducing heads and flanges according to claim 1, characterized in that: The movable component includes mounting slots (202) respectively opened on the top of the left and right sides of the support column (200). A dual-head motor (205) is embedded inside the support column (200). The inner cavities of the two sets of mounting slots (202) are respectively rotatably connected to lead screws (204). The threads of the two sets of lead screws (204) are arranged in opposite directions. The two sets of output shafts of the dual-head motor (205) extend to the inner cavity of the corresponding side mounting slot (202) and are keyed together with the end of the corresponding side lead screw (204). The surfaces of the two sets of lead screws (204) are respectively threaded with nut seats (203). The tops of the two sets of nut seats (203) are respectively connected to the bottom of the corresponding side arc-shaped clamp (201).

5. The welding and positioning fixture for reducing heads and flanges according to claim 1, characterized in that: The rotating component includes a mounting bracket (102) disposed at the bottom of the workbench (100) table surface. The inner cavity of the mounting bracket (102) is rotatably connected to a worm gear (103). The worm gear (103) passes through the workbench (100) table surface upward and is fixedly connected to the center of the bottom of the support column (200). The tooth surface of the worm gear (103) meshes with a worm (104). Bearing seats (105) are respectively sleeved at both ends of the worm (104). The tops of the two sets of bearing seats (105) are respectively fixedly connected to the bottom of the workbench (100) table surface. One end of the worm (104) extends towards the front of the workbench (100) and is fixedly connected to a rotating disk (101).

6. The welding and positioning fixture for reducing heads and flanges according to claim 1, characterized in that: The sliding connector includes guide strips (302) that are fixedly installed at the bottom of each group of positioning plates (301). The top of the front and rear sides of the support column (200) is provided with guide grooves (303). The ends of the two groups of guide strips (302) are slidably connected to the inner cavity of the corresponding side guide grooves (303).

7. The welding and positioning fixture for reducing heads and flanges according to claim 4, characterized in that: Folding curtains (206) are fixedly installed on the upper sides of the two sets of nut seats (203), and the other end of each set of folding curtains (206) is fixedly connected to the inner wall of the corresponding side mounting groove (202).

Images