Fixing tool for pipe fitting
By designing fixed fixtures for pipe fittings and adopting expansion, compression, and clamping mechanisms, the problems of poor concentricity and unstable fixing during pipe fitting processing and welding were solved, achieving efficient and stable pipe fitting processing and welding, and improving production efficiency and material quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-09
- Publication Date
- 2026-03-31
AI Technical Summary
Existing fixtures and tooling have problems such as poor concentricity, unstable fixing, complicated operation, and poor versatility in pipe processing and welding, resulting in poor coaxiality after welding, pipe deformation, and low production efficiency.
A fixing fixture for pipe fittings was designed, including two legs, a main shaft, a tensioning mechanism, a clamping mechanism, and a clamping mechanism. The tensioning mechanism maintains concentricity, while the clamping and clamping mechanisms ensure that the end faces of the pipe fittings are aligned, thus achieving automatic alignment and uniform tensioning.
It improves the concentricity and coaxiality of pipe fittings after welding, reduces production costs, improves production efficiency and material quality, and is suitable for processing pipe fittings of various specifications.
Smart Images
Figure CN121756005A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of fixing fixtures for pipe welding, and specifically relates to a fixing fixture for pipe fittings. Background Technology
[0002] Currently, in the mechanical manufacturing process, most fixtures and tooling have simple structures. They generally use bolts or clamps to radially clamp pipes, relying on manual adjustment of the position. The concentricity error often reaches 0.5~2mm, and uneven clamping force can easily lead to pipe deformation. Alternatively, the pipes are placed on V-blocks and fixed by top pressure blocks, but the pipe axis direction cannot be actively adjusted, and the adaptability to pipes of different diameters is poor.
[0003] The above-mentioned method of clamping pipe fittings has the following drawbacks: Manual adjustment or simple clamps can easily cause the pipe fitting axis to shift, resulting in poor coaxiality after welding. Uncontrollable tightening force: Excessive clamping force can cause pipe fittings to crush (thin-walled pipes), while insufficient clamping force can cause pipe fittings to shift during welding. It has poor versatility, and tooling needs to be changed frequently for pipe fittings of different diameters, wall thicknesses and materials. It is inefficient and complicated to operate, requiring multiple adjustments and positioning, and takes up 30% to 50% of the total welding time. Summary of the Invention
[0004] To address the technical problems of poor concentricity and unstable fixing during pipe fitting processing and welding in the prior art, this invention provides a fixing fixture for pipe fittings. This fixing fixture replaces the current simple fixture, avoiding the problems of multiple positioning adjustments and large concentricity errors during welding. It is simple to operate and easy to learn, improving the quality and pass rate of materials, reducing production costs, and increasing production efficiency.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A fixing fixture for pipe fittings, comprising: Two legs, with at least one support block installed on the opposite side of each leg. The support blocks are arranged in pairs. A main shaft is provided between the two legs, with both ends of the main shaft resting on the support blocks. An expansion mechanism for fixing a workpiece to be processed, wherein the workpiece to be processed is a tubular structure and the expansion mechanism is located inside the workpiece to be processed; A clamping mechanism installed at one end of the spindle, the clamping mechanism being used to clamp the workpiece to be processed at one end; and The clamping mechanism is provided relative to the clamping mechanism. The clamping mechanism is installed at the other end of the spindle and is used to abut against the other end of the workpiece to be processed. The number of workpieces to be processed is at least two. The tensioning mechanism is located between the pressing mechanism and the abutting mechanism. Operating the pressing mechanism can make the end faces of two adjacent workpieces to be processed coaxially aligned.
[0006] Furthermore, the clamping mechanism includes: a cover plate, a limiting block fixed to one side of the cover plate, and a clamping assembly. The cover plate is fixedly installed with the main shaft. There are two limiting blocks, which are distributed opposite each other on both sides of the circular hole opened in the middle of the cover plate. The clamping assembly is installed on the cover plate and includes a movable clamping block. An inclined groove is provided on the opposite side of the limiting blocks. The movable clamping block slides with the limiting block through the inclined groove. The movable clamping block can slide under the restriction of the limiting block to clamp the end face of the workpiece to be processed.
[0007] Furthermore, the movable pressure block has a U-shaped structure with a groove. The side of the movable pressure block away from the groove is slidably connected to the limiting block. The pressing assembly also includes a rotating column and a connecting sleeve. The rotating column is rotatably connected to the cover plate. The connecting sleeve is sleeved outside the rotating column and threadedly connected to the rotating column. The connecting sleeve is slidably disposed in the groove of the movable pressure block. Rotating the rotating column can drive the movable pressure block to slide along the inclined groove of the limiting block through the connecting sleeve.
[0008] Furthermore, the clamping mechanism includes an end plate with a hole in the middle, a pressure plate connecting block, and a clamping assembly. The end plate is fixedly connected to the main shaft, and two pressure plate connecting blocks are fixedly connected to one side of the end plate. The pressure plate connecting blocks are located on both sides of the hole in the end plate. Each pressure plate connecting block is hinged to a clamping assembly, and the clamping assembly is elastic to abut against the end of the workpiece to be processed.
[0009] Furthermore, the clamping assembly includes an adjusting post, a back clamping plate, a pressure plate, and a spring. The pressure plate is hinged to the pressure plate connecting block. The end of the pressure plate away from the pressure plate connecting block is a free end, which is the end away from the hole in the end plate. The adjusting post passes through the pressure plate and then through the back clamping plate fixed on the end plate. The adjusting post is rotatably connected to the back clamping plate. The spring is located on the side of the end plate away from the workpiece to be processed. The spring is sleeved on the adjusting post and one end abuts against the pressure plate, so that under the action of the spring, the free end of the pressure plate can be pushed to abut against the end face of the workpiece to be processed.
[0010] Furthermore, the tensioning mechanism includes a chuck, a torsion bar, and a tensioning assembly. The chuck has a hole in the middle and is fixedly connected to the main shaft. The torsion bar is perpendicular to the chuck and rotatably connected to it. A first gear is fixed to this end of the torsion bar. The first gear is connected to the tensioning assembly. The tensioning assembly is mounted on the chuck. The end of the torsion bar away from the chuck extends out of the workpiece to be processed, so that operating this end of the torsion bar can fix the workpiece to be processed or remove it through the tensioning assembly.
[0011] Furthermore, the tightening assembly includes a second gear, a threaded disc, and jaws. The second gear is concentric with and rotatably connected to the chuck, and meshes with the first gear. There are at least two jaws, which are arranged in the radial direction of the chuck and slidably connected to it. The end of the jaw away from the spindle is a free end, which can abut against the inner wall of the workpiece to be processed. A threaded disc is fixed on one side of the second gear, and the threaded disc is respectively connected to each jaw so that when the second gear rotates, the jaws can be moved along the radial direction of the chuck through the threaded disc.
[0012] Furthermore, there are four tensioning mechanisms and six jaws, with each jaw arranged in a central circumferential array along the chuck.
[0013] Furthermore, the spindle end has two circumferential planes arranged opposite to each other. The support block has a locking groove for placing the spindle. The support block also includes a "U"-shaped locking pin with a groove. The "U"-shaped locking pin can be placed in the locking groove of the support block and engaged with both sides of the spindle plane to restrict the rotation of the spindle.
[0014] Furthermore, each leg is equipped with four support blocks.
[0015] Compared with existing technologies, the beneficial effects of this solution are: This invention provides a fixing fixture for pipe fittings. At least one support block is installed on one side of the legs opposite each other. A main shaft is arranged between the two legs, with both ends of the main shaft resting on the support block. An expansion mechanism is used to fix the workpiece to be processed, a clamping mechanism is used to clamp it to one end of the workpiece to be processed, and a pressing mechanism is used to abut against the other end of the workpiece to be processed. Operating the clamping mechanism can make the end faces of two adjacent workpieces to be processed coaxially aligned.
[0016] By setting up a tightening mechanism, the concentricity of each pipe section can be maintained during processing. A U-shaped locking pin is inserted into the support block after the pipe section is inserted into the fixture to prevent the spindle from rotating. Using a torque wrench, the torsion bars of each tightening mechanism are rotated sequentially to open the clamping jaws and tighten each pipe section to maintain concentricity. The left-side pressing mechanism is operated to move the workpiece to be processed along the spindle towards the clamping mechanism. In actual welding, the end face of the pipe section will melt at high temperatures. This embodiment is equipped with a clamping mechanism, which ensures that the end faces of each workpiece section remain tightly pressed together, compacting the gaps in the pipe section for welding or drilling operations.
[0017] The pipe fittings of this invention use fixed fixtures instead of the current simple fixtures, avoiding the problems of multiple positioning adjustments and large concentricity errors during welding. The operation is simple and easy to learn, improving the quality and pass rate of materials, reducing production costs, and increasing production efficiency.
[0018] Specifically, by using the pipe fitting fixing fixture of the present invention, automatic centering (concentricity ≤ ±0.05mm) can be achieved during processing, resulting in high concentricity: the self-centering mechanism ensures that the pipe axis deviation is ≤ ±0.05mm, and the coaxiality after welding is superior to industry standards (such as GB / T 12459-2017); by setting an expansion mechanism, the expansion force is uniform and controllable (avoiding deformation), and the expansion is reliable; the torque wrench enables uniform and adjustable expansion force, and thin-walled pipes (wall thickness ≤ 2mm) are free from crushing deformation; it is compatible with multiple specifications of pipe fittings (inner diameter range Φ180~Φ260mm), and has strong versatility. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the fixing fixture structure for this pipe fitting; Figure 2 for Figure 1 Enlarged view of point A in the image; Figure 3 This is a schematic diagram of the clamping mechanism. Figure 4 This is a schematic diagram of another structure of the clamping mechanism; Figure 5 This is a schematic diagram of the clamping mechanism. Figure 6 This is a schematic diagram of another structure of the clamping mechanism; Figure 7 This is a schematic diagram of the tensioning mechanism. Figure 8 This is a schematic diagram of another structure of the tensioning mechanism.
[0020] The reference numerals in the attached figures are as follows: 1. Support leg, 11. Support block, 111. U-shaped locking pin, 12. Main shaft, 2. Expansion mechanism, 21. Chuck, 22. Torsion bar, 23. First gear, 24. Second gear, 241. Gear ring, 242. Fixed sleeve, 243. Rotary connection, 25. Threaded disc, 26. Claw, 27. Rack, 3. Pressing mechanism, 31. Cover plate, 32. Limiting block, 321. Inclined groove, 33. Movable pressing block, 34. Rotating column, 35. Connecting sleeve, 46. Pressing mechanism, 47. End plate, 41. Pressing plate connecting block, 42. Adjusting column, 43. Back plate, 44. Pressing plate, 45. Spring, 46. Pressing sleeve. Detailed Implementation
[0021] The present invention will now be described in further detail with reference to the accompanying drawings.
[0022] A type of pipe fitting using a fixing fixture, such as Figure 1 As shown, it includes: Two legs 1, at least one support block 11 is installed on the opposite side of the legs 1, the support blocks 11 are arranged in pairs, and a main shaft 12 is arranged between the two legs 1, with the two ends of the main shaft 12 resting on the support blocks 11 respectively; The expansion mechanism 2 is used to fix the workpiece to be processed. The workpiece to be processed is a tubular structure (not visible in the workpiece diagram). The expansion mechanism 2 is located inside the workpiece to be processed. A clamping mechanism 3 is installed at one end of the spindle 12, the clamping mechanism 3 being used to clamp the workpiece to be processed at one end; and The clamping mechanism 4 is provided relative to the clamping mechanism 3. The clamping mechanism 4 is installed at the other end of the spindle 12 and is used to abut against the other end of the workpiece to be processed. The number of workpieces to be processed is at least two. The expansion mechanism 2 is disposed between the pressing mechanism 3 and the abutting mechanism 4. Operating the pressing mechanism 3 can make the end faces of two adjacent workpieces to be processed coaxially aligned.
[0023] According to a specific embodiment of the present invention, two support legs 1 serve as the base of the entire fixed fixture. The two support legs 1 are arranged parallel to each other and perpendicular to the ground. At least one set of support blocks 11 (a pair of left and right legs constitute one set) are mounted on the side of the support legs 1, providing multiple height options from 350mm to 900mm, allowing the operator to weld in both sitting and standing positions, and also allowing four sets of fixtures to be placed and welded simultaneously. The support legs 1 have a rectangular cross-section structure. Support blocks 11 are fixed on the side of the support legs 1 that are close to each other. The support blocks 11 have a hexahedral structure. A main shaft 12 is arranged between the two support legs 1. The main shaft 12 is arranged horizontally, with both ends of the main shaft 12 resting on the support blocks 11 respectively. The main shaft 12 passes through the pressing mechanism 3, the expansion mechanism 2, and the abutment mechanism 4 in sequence.
[0024] The tensioning mechanism 2 is installed on the main shaft 12. By setting the tensioning mechanism 2, the concentricity of each section of the pipe can be maintained during processing. The "U"-shaped locking pin 111 is inserted into the support block 11 after the pipe is inserted into the tooling to prevent the main shaft 12 from rotating. Using a torque wrench, the torsion bar 22 of each tensioning mechanism 2 is rotated in sequence to open the pawl 26 of the tensioning mechanism 2 so that it can tighten each section of the pipe to maintain concentricity. The left clamping mechanism 3 is operated to move the workpiece to be processed along the main shaft 12 toward the clamping mechanism 4. In the actual welding process, the end face of the pipe will melt at high temperature. This embodiment is equipped with a clamping mechanism 4, which can keep the end face of each section of the workpiece to be processed in close contact, and compact the gap of the pipe to be processed for welding or drilling operations.
[0025] The pipe fittings of this invention use fixed fixtures instead of the current simple fixtures, avoiding the problems of multiple positioning adjustments and large concentricity errors during welding. The operation is simple and easy to learn, improving the quality and pass rate of materials, reducing production costs, and increasing production efficiency.
[0026] Specifically, by using the pipe fitting fixing tooling of the present invention... During processing, it can automatically align itself (concentricity ≤ ±0.05mm), with high concentricity: the self-centering mechanism ensures that the pipe axis deviation is ≤ ±0.05mm, and the coaxiality after welding is better than the industry standard (such as GB / T 12459-2017). By setting the tensioning mechanism 2, the tensioning force is uniform and controllable (avoiding deformation), and the tensioning is reliable. The torque wrench enables uniform and adjustable tensioning force, and thin-walled tubes (wall thickness ≤ 2mm) are free from crushing deformation. It is compatible with multiple pipe fitting specifications (inner diameter range Φ180~Φ260mm) and has strong versatility.
[0027] Furthermore, such as Figure 3 and Figure 4 As shown, the clamping mechanism 3 includes: a cover plate 31, a limiting block 32 fixed on one side of the cover plate 31, and a clamping assembly. The cover plate 31 is fixedly installed with the main shaft 12. There are two limiting blocks 32, which are distributed opposite to each other on both sides of the circular hole opened in the middle of the cover plate 31. The clamping assembly is installed on the cover plate 31 and includes a movable pressing block 33. An inclined groove 321 is provided on the opposite side of the limiting blocks 32. The movable pressing block 33 slides with the limiting block 32 through the inclined groove 321. The movable pressing block 33 can slide under the restriction of the limiting block 32 to press against the end face of the workpiece to be processed.
[0028] Furthermore, the movable pressure block 33 has a U-shaped structure with a groove. The side of the movable pressure block 33 facing away from the groove is slidably connected to the limiting block 32. The pressing assembly also includes a rotating column 34 and a connecting sleeve 35. The rotating column 34 is rotatably connected to the cover plate 31. The connecting sleeve 35 is sleeved on the outside of the rotating column 34 and threadedly connected to the rotating column 34. The connecting sleeve 35 is slidably disposed in the groove of the movable pressure block 33. Rotating the rotating column 34 can drive the movable pressure block 33 to slide along the inclined groove 321 of the limiting block 32 through the connecting sleeve 35.
[0029] According to a specific embodiment of the present invention, a specific structure of a clamping mechanism 3 is provided. A circular hole is opened in the middle of the cover plate 31, and a connecting ring is fixed on the other side of the cover plate 31. The connecting ring has a hole and is fixed to a threaded hole on the main shaft 12 by fasteners. Limiting blocks 32 are symmetrically arranged on both sides of the center of the cover plate 31 and are fixed to the cover plate 31 by fasteners. An inclined groove 321 extends from the outside of the cover plate 31 towards the center. The inclined groove 321 has a "T"-shaped groove structure. The end of the movable pressure block 33 has a matching "T"-shaped groove structure. The movable pressure block 33 is arranged parallel to the cover plate 31. Each limiting block 32 is slidably mounted with a clamping component. By operating the rotating column 34, the movable pressure block 33 can be moved along its respective limiting block 32.
[0030] The rotating column 34 is set vertically to the cover plate 31. The rotating column 34 passes through the cover plate 31 and is rotatably connected to it. The connecting sleeve 35 is slidably set in the groove of the movable pressure block 33, so that when the rotating column 34 is rotated, the connecting sleeve 35 will move along its axis, thereby driving the movable pressure block 33 to slide along the inclined groove 321. The groove of the movable pressure block 33 is an open structure to avoid restricting the movement of the connecting sleeve 35 along the groove of the movable pressure block 33. The end of the movable pressure block 33 away from the limiting block 32 is used to abut against the workpiece to be processed.
[0031] Furthermore, such as Figure 5 and Figure 6 As shown, the clamping mechanism 4 includes an end plate 41 with a hole in the middle, a pressure plate connecting block 42, and a clamping assembly. The end plate 41 is fixedly connected to the main shaft 12. Two pressure plate connecting blocks 42 are fixedly connected to one side of the end plate 41. The pressure plate connecting blocks 42 are located on both sides of the hole in the end plate 41. Each pressure plate connecting block 42 is hinged to a clamping assembly. The clamping assembly is elastic to abut against the end of the workpiece to be processed.
[0032] According to a specific embodiment of the present invention, the end plate 41 and the cover plate 31 are arranged parallel to each other, and the pressure plate connecting block 42 is symmetrically arranged on both sides of the center of the end plate 41. A ring structure is fixedly protruding on one side of the end plate 41, and the ring structure is fixedly connected to the threaded holes distributed on the main shaft 12 by fasteners.
[0033] Furthermore, the clamping assembly includes an adjusting post 43, a back clamping plate 44, a pressure plate 45, and a spring 46. The pressure plate 45 is hinged to the pressure plate connecting block 42. The end of the pressure plate 45 away from the pressure plate connecting block 42 is a free end, which is the end away from the hole in the end plate 41. The adjusting post 43 passes through the pressure plate 45 and then through the back clamping plate 44 fixed on the end plate 41. The adjusting post 43 is rotatably connected to the back clamping plate 44. The spring 46 is located on the side of the end plate 41 away from the workpiece to be processed. The spring 46 is sleeved on the adjusting post 43 and one end abuts against the pressure plate 45. The end of the adjusting post 43 away from the back clamping plate 44 is threadedly connected to a pressure sleeve 47. Thus, rotating the pressure sleeve 47 can compress the spring 46, thereby changing the length of the spring 46 and pushing the pressure plate 45 to rotate, so that under the action of the spring 46, the free end of the pressure plate 45 can be pushed to abut against the end face of the workpiece to be processed.
[0034] Furthermore, such as Figure 7 and Figure 8As shown, the tensioning mechanism 2 includes a chuck 21, a torsion bar 22, and a tensioning assembly. The chuck 21 has a hole in the middle and is fixedly connected to the main shaft 12. The torsion bar 22 is perpendicular to the chuck 21 and rotatably connected to the chuck 21. A first gear 23 is fixed to this end of the torsion bar 22. The first gear 23 is connected to the tensioning assembly. The tensioning assembly is installed on the chuck 21. The end of the torsion bar 22 away from the chuck 21 extends out of the workpiece to be processed, so that the workpiece to be processed can be fixed or removed by operating this end of the torsion bar 22 through the tensioning assembly.
[0035] Furthermore, the tightening assembly includes a second gear 24, a threaded disc, and jaws 26. The second gear 24 is concentric with and rotatably connected to the chuck 21. The second gear 24 meshes with the first gear 23. There are at least two jaws 26. The jaws 26 are arranged in the radial direction of the chuck 21 and are slidably connected to the chuck 21. The end of the jaw 26 away from the spindle 12 is a free end, which can abut against the inner wall of the workpiece to be processed. A threaded disc is fixed on one side of the second gear 24. The threaded disc is respectively connected to each jaw 26. That is, the threaded disc has an external thread, which is formed around the center of the threaded disc. The jaw 26 has a rack 27 located in the external thread, so that when the second gear 24 rotates, the threaded disc can drive the jaw 26 to move along the radial direction of the chuck 21.
[0036] According to a specific embodiment of the present invention, the chuck 26 can be configured as a double-layer structure. The workpiece to be processed is a tubular structure. When the workpiece to be processed is multi-segmented, the tensioning mechanism 2 is located at the ends of two workpieces to be processed, and the double-layer structure of the chuck 26 abuts against the inner walls of two adjacent tubular structures respectively. The torsion bar 22 is rotatably mounted on the chuck 21. One end of the torsion bar 22 is fixed with a first gear 23, and the other end of the torsion bar 22 extends outside the tubular structure, and this end is used for rotation by the operator. After the torsion bar 22 rotates, it drives the second gear 24 (large gear) to rotate through the first gear 23 (small gear). The second gear 24 has an outer gear ring 241 and an inner fixed sleeve 242. The inner fixed sleeve 242 is fixed to the main shaft 12. The outer gear ring 241 is rotatably connected to the inner fixed sleeve 242, and the gear ring 241 meshes with the first gear 23. After the second gear 24 rotates, its fixed threaded disk rotates synchronously, driving the chuck 26 to move along the radius of the chuck 21, so that the chuck 26 abuts against or moves away from the inner wall of the pipe fitting.
[0037] Furthermore, there are four expansion mechanisms 2, which can fix five pipe sections. There are six claws 26, and each claw 26 is arranged in a central circumferential array along the chuck 21.
[0038] Furthermore, such as Figure 1 and Figure 2As shown, the spindle 12 has two planes circumferentially at its end, which are arranged opposite to each other. The support block 11 has a locking groove for placing the spindle 12. The support block 11 also includes a U-shaped locking pin 111 with a groove. The U-shaped locking pin 111 can be placed in the locking groove of the support block 11 and engaged with both sides of the plane of the spindle 12 to restrict the rotation of the spindle 12.
[0039] The upper part of the "U"-shaped locking pin 111 is fixed with a cylindrical handle to facilitate removal from the locking groove of the support block 11. The "U"-shaped locking pin 111 is located between the main shaft 12 and the support block 11. The "U"-shaped locking pin 111 is engaged with the main shaft 12 and the support block 11 to fill the space and prevent the main shaft 12 from rotating relative to the support block 11.
[0040] Furthermore, each leg 1 is equipped with four support blocks 11.
[0041] The working process of this invention is as follows: The pipe fittings are inserted into the pipe fitting fixing fixture in sequence by hand, up to five sections can be installed. After insertion, the U-shaped locking pins 111 are inserted into the support block 11 of the support leg 1 to prevent the main shaft 12 from rotating. The torque wrench is used to rotate the torsion bar 22 of each expansion mechanism 2 to expand the pipe fittings evenly. Then the rotating column 34 is rotated to press the pipe fittings through the movable pressure block 33, and the gap is closed. The torque wrench is used again to rotate the torsion bar 22 of each expansion mechanism 2 to expand the pipe fittings to the required torque. Finally, the torque wrench is used to rotate the adjusting column 43 in the clamping mechanism 4 to the required torque. The assembly is now complete. The U-shaped locking pins 111 are removed and the main shaft 12 can be rotated 180° to achieve full circumference welding of the pipe fittings.
[0042] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0043] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A fixing fixture for pipe fittings, characterized in that, include: Two legs, with at least one support block installed on the opposite side of each leg. The support blocks are arranged in pairs. A main shaft is provided between the two legs, with both ends of the main shaft resting on the support blocks. An expansion mechanism for fixing a workpiece to be processed, wherein the workpiece to be processed is a tubular structure and the expansion mechanism is located inside the workpiece to be processed; A clamping mechanism installed at one end of the spindle, the clamping mechanism being used to clamp the workpiece to be processed at one end; and The clamping mechanism is provided relative to the clamping mechanism. The clamping mechanism is installed at the other end of the spindle and is used to abut against the other end of the workpiece to be processed. The number of workpieces to be processed is at least two. The tensioning mechanism is located between the pressing mechanism and the abutting mechanism. Operating the pressing mechanism can make the end faces of two adjacent workpieces to be processed coaxially aligned.
2. The fixing fixture for pipe fittings according to claim 1, characterized in that, The clamping mechanism includes: a cover plate, a limiting block fixed to one side of the cover plate, and a clamping assembly. The cover plate is fixedly installed with the main shaft. There are two limiting blocks, which are distributed opposite each other on both sides of a circular hole in the middle of the cover plate. The clamping assembly is installed on the cover plate and includes a movable clamping block. An inclined groove is provided on the opposite side of the limiting blocks. The movable clamping block slides with the limiting block through the inclined groove. The movable clamping block can slide under the restriction of the limiting block to clamp the end face of the workpiece to be processed.
3. The fixing fixture for pipe fittings according to claim 2, characterized in that, The movable pressure block has a "U"-shaped structure with a groove. The side of the movable pressure block away from the groove is slidably connected to the limiting block. The clamping assembly also includes a rotating column and a connecting sleeve. The rotating column is rotatably connected to the cover plate. The connecting sleeve is sleeved on the outside of the rotating column and threadedly connected to the rotating column. The connecting sleeve is slidably disposed in the groove of the movable pressure block. Rotating the rotating column can drive the movable pressure block to slide along the inclined groove of the limiting block through the connecting sleeve.
4. The fixing fixture for pipe fittings according to claim 3, characterized in that, The clamping mechanism includes an end plate with a hole in the middle, a pressure plate connecting block, and a clamping assembly. The end plate is fixedly connected to the main shaft. Two pressure plate connecting blocks are fixedly connected to one side of the end plate. The pressure plate connecting blocks are located on both sides of the hole in the end plate. Each pressure plate connecting block is hinged to a clamping assembly. The clamping assembly is elastic to abut against the end of the workpiece to be processed.
5. A fixing fixture for pipe fittings according to claim 4, characterized in that, The clamping assembly includes an adjusting post, a back clamping plate, a pressure plate, and a spring. The pressure plate is hinged to the pressure plate connecting block. The end of the pressure plate away from the pressure plate connecting block is a free end, which is the end away from the hole in the end plate. The adjusting post passes through the pressure plate and then through the back clamping plate fixed on the end plate. The adjusting post and the back clamping plate are rotatably connected. The spring is located on the side of the end plate away from the workpiece to be processed. The spring is sleeved on the adjusting post and one end abuts against the pressure plate, so that under the action of the spring, the free end of the pressure plate can be pushed to abut against the end face of the workpiece to be processed.
6. A fixing fixture for pipe fittings according to claim 1 or 5, characterized in that, The tensioning mechanism includes a chuck, a torsion bar, and a tensioning assembly. The chuck has a hole in the middle and is fixedly connected to the main shaft. The torsion bar is perpendicular to the chuck and rotatably connected to it. A first gear is fixed to this end of the torsion bar. The first gear is connected to the tensioning assembly. The tensioning assembly is mounted on the chuck. The end of the torsion bar away from the chuck extends out of the workpiece to be processed, so that the workpiece to be processed can be fixed or removed by operating this end of the torsion bar through the tensioning assembly.
7. A fixing fixture for pipe fittings according to claim 6, characterized in that, The tightening assembly includes a second gear, a threaded disc, and jaws. The second gear is concentric with and rotatably connected to the chuck, and meshes with the first gear. There are at least two jaws, which are arranged in the radial direction of the chuck and slidably connected to it. The end of the jaw away from the spindle is a free end, which can abut against the inner wall of the workpiece to be processed. A threaded disc is fixed to one side of the second gear, and the threaded disc is respectively connected to each jaw so that when the second gear rotates, the jaws can be moved along the radial direction of the chuck through the threaded disc.
8. A fixing fixture for pipe fittings according to claim 6 or 7, characterized in that, There are four tensioning mechanisms and six jaws, with each jaw arranged in a central circumferential array along the chuck.
9. A fixing fixture for pipe fittings according to claim 1 or 8, characterized in that, The spindle end has two circumferential planes arranged opposite each other. The support block has a locking groove for placing the spindle. The support block also includes a "U"-shaped locking pin with a groove. The "U"-shaped locking pin can be placed in the locking groove of the support block and engaged with both sides of the spindle plane to restrict the rotation of the spindle.
10. A fixing fixture for pipe fittings according to claim 9, characterized in that, Each leg has four support blocks installed.