CN112404865B - Multi-degree-of-freedom positioning welding clamp for bent pipe - Google Patents
Multi-degree-of-freedom positioning welding clamp for bent pipe Download PDFInfo
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- CN112404865B CN112404865B CN202011370626.3A CN202011370626A CN112404865B CN 112404865 B CN112404865 B CN 112404865B CN 202011370626 A CN202011370626 A CN 202011370626A CN 112404865 B CN112404865 B CN 112404865B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Abstract
A multi-degree-of-freedom positioning welding fixture for bent pipes comprises bent pipes to be welded, a front flange and a rear flange, and further comprises a base, and a front clamp, a middle clamp and a tail clamp which are sequentially arranged at the head part, the middle part and the tail part of the base. The multi-degree-of-freedom positioning welding fixture for the bent pipe, provided by the invention, can be used for carrying out multi-degree-of-freedom adjustment according to the angle of a bent pipe sample piece with a space size, can be used for easily clamping a workpiece, has the advantages of simple structure, low cost, capability of sharing one set of fixture for bent pipes with different space angle sizes and the like, avoids the inconvenience that a new set of fixture needs to be manufactured when the space angle of the sample piece workpiece is changed, and reduces the manufacturing cost of the bent pipe workpiece with different space sizes.
Description
Technical Field
The invention relates to a multi-degree-of-freedom positioning welding fixture for a bent pipe, which is suitable for technological equipment for multi-degree-of-freedom positioning welding of the bent pipe with a space angle which is not suitable for measurement and sample piece inspection, and is particularly suitable for positioning welding of the bent pipe with consistent basic appearance size and frequently changed end part space angle.
Background
In the production process of certain bent pipes with space dimensions, due to the limitation of the use environment of the pipes, specific dimensions such as space angles and the like of the pipes are not provided, only basic overall dimensions such as length, width and the like and sample pieces formed after bending according to the actual conditions on site are provided, then the inspection of bent pipes in subsequent production is carried out according to the sample pieces, the bent pipes are generally divided into a plurality of sections to be welded into a whole during production, one end flange is adopted for positioning, the connection positioning of the other end flange needs to be carried out on-site repair positioning according to the sample pieces, and when the sample pieces are not in place, the production of clamps cannot be carried out, so that the production period is influenced. And if the spatial angle of the sample piece changes, the clamp needs to be manufactured again, so that the cost is high, and the production cycle is influenced.
Meanwhile, in the conventional positioning welding clamp, the middle of a pipe to be welded is connected with a base on the spot of a wooden support, the U-shaped wooden support cannot be clamped when the allowance of the middle bent pipe is repaired, the bent pipe can only be taken down and clamped by a bench vice and then repaired, then the original clamp is subjected to trial assembly, and if the bent pipe is not suitable, the bench vice is required to be repaired, so that the operation is very complicated.
Disclosure of Invention
Based on the above problems, the invention aims to provide a multi-degree-of-freedom positioning welding fixture for a bent pipe, which can adapt to different space angles when being used for positioning welding of the bent pipe, and is simple in structure and convenient to use.
In order to realize the purpose, the invention adopts the technical scheme that: a multi-degree-of-freedom positioning welding fixture for bent pipes comprises a bent pipe to be welded, a front flange, a rear flange, a base, and a front clamp, a middle clamp and a tail clamp which are sequentially arranged at the head part, the middle part and the tail part of the base;
the base extends along the horizontal projection direction of the bent pipe;
the front clamp comprises a positioning plate, a front shaft sleeve, a front positioning sleeve and a hook bolt, wherein the positioning plate is arranged at the head part of the base, the axis of an opening of the front shaft sleeve is parallel to the positioning plate and is slidably arranged on the positioning plate through a front shaft seat, the rear end wall of the front shaft sleeve radially extends outwards to form an annular wall coaxial with the front flange, a plurality of lug plates are arranged at the end part of the front shaft sleeve, the front end of the hook bolt is a threaded section connected with the lug plates through a barrel-shaped nut, the rear end of the hook bolt is a hook-shaped section used for clamping the front flange, and the front positioning sleeve is inserted into the opening of the front shaft sleeve and used for positioning a front end pipe orifice of the bent pipe;
the middle clamp comprises a clamp seat, clamp blocks and a long screw rod, the clamp seat is arranged on the base, the clamp blocks with opposite clamp openings are respectively connected with the clamp seat in a sliding manner, coaxial screw holes are formed in the two clamp blocks, two screw sections which are sequentially in threaded connection with the screw holes in the two clamp blocks and have opposite rotation directions are arranged on the long screw rod and are used for controlling the two clamp blocks to be clamped and loosened, and the plurality of middle clamps are sequentially arranged on the seat and are used for clamping the middle section of the bent pipe;
the rear clamp comprises a rear seat, a rotating plate, ball joints, ball stud bolts, a threaded sleeve, a rear shaft seat, a rear positioning pin, a rear positioning sleeve and a butterfly nut, wherein an upper ball socket with a horizontal opening is arranged at the upper end of the rear seat, the rear end of each ball joint is provided with a ball head end matched with the upper ball socket, the front end of each ball joint is provided with a connecting end connected with the upper end of the rotating plate, the lower end of the rotating plate and the rear seat are respectively provided with lower ball sockets, the ball head ends of the two ball stud bolts are respectively matched with the two lower ball sockets, the two ends of the threaded sleeve are respectively provided with threaded ports with opposite rotation directions, and the threaded ends of the two ball stud bolts are respectively connected with the two threaded ports of the threaded sleeve; the opening axis of the rear shaft sleeve is parallel to the rotating plate and is slidably mounted on the rotating plate through a rear shaft seat, the front end wall of the rear shaft sleeve radially extends outwards to form an annular wall matched with the rear flange, a connecting hole is formed in the rear flange, a positioning hole is formed in the annular wall, a rear positioning pin sequentially penetrates through the connecting hole and the positioning hole and then is connected with a butterfly nut to coaxially fasten the rear flange and the rear shaft sleeve, and the rear positioning sleeve is inserted into the opening of the rear shaft sleeve and used for positioning a rear end pipe orifice of the bent pipe.
The invention also discloses a method for clamping the bent pipe by using the bent pipe multi-degree-of-freedom positioning welding fixture, which comprises the following steps:
step 4, performing positioning welding according to the requirements of the process specification, and respectively welding the front flange and the rear flange with the bent pipe;
and 5, after welding is finished, taking down the pipe fitting from the clamp.
Specifically, a through hole is formed in the lug, a cylindrical nut is arranged at the front end of the through hole, the thread section of the hook-shaped bolt penetrates through the through hole in the lug and then is connected with the cylindrical nut, the cylindrical nut is rotated, and the hook-shaped section is controlled to be close to or far away from the front flange of the pipe bend, so that the front flange is clamped or loosened; a rotating handle can be further arranged on the barrel nut, and the rotation of the barrel nut is controlled by the rotating handle.
Specifically, the front flange is provided with a mounting hole, the annular wall of the front shaft sleeve is provided with a positioning hole matched with the mounting hole, and the front shaft sleeve and the front flange are coaxially connected and positioned after the front positioning pin sequentially penetrates through the mounting hole and the positioning hole.
Specifically, set up the bar hole on the front axle seat, the screw that corresponds with bar hole position on the locating plate adopts the bolt to pass behind the bar hole screw and connects in order to install the front axle seat on the locating plate, and the front axle seat leads to for the locating plate slides to the coaxial adaptation in front axle sleeve, return bend front end mouth of pipe, the front flange position that make the front clamp on along the direction that the bar hole was injectd.
Specifically, a key groove with an opposite opening is formed in the butt joint of the front shaft seat and the positioning plate, a front positioning key is arranged in the key groove, the key groove and the strip-shaped hole in the positioning plate are consistent in extending direction, the front shaft seat slides on the positioning plate along the direction limited by the strip-shaped hole through the front positioning key, and meanwhile the front shaft seat is prevented from shaking; the front positioning key and the positioning plate can be further fixed through screws.
Specifically, one end of the front positioning sleeve is a positioning end matched with the front end pipe orifice, a handheld rod is arranged at the other end of the front positioning sleeve, and an operator inserts or extracts the front positioning sleeve into or out of the front end pipe orifice through the handheld rod.
Specifically, one end of the long screw rod is rotatably connected with the side part of the clamping seat, the other end of the long screw rod is provided with a hand wheel, and the long screw rod is rotated through the hand wheel to control the two clamping blocks to be clamped and loosened when the clamping device is used.
The middle clamp further comprises a guide block arranged on the clamp seat, a U-shaped guide opening with an opening direction consistent with the clamp opening directions of the two clamp blocks is formed in the guide block, a pipe section firstly penetrates through the guide opening and then is clamped in the clamp opening, and the guide block is used for supporting and positioning and guiding the pipe section of the pipe fitting to be welded; specifically, the clamping seat is provided with a sliding groove, the clamping block is connected with the sliding groove in a sliding mode, and the guide block is installed on the groove wall of the sliding groove through screws.
Specifically, the middle clamp further comprises a U-shaped frame with a U-shaped through groove, and the U-shaped frame is mounted at the rear portion of the front clamp and used for supporting a pipe section, close to the front flange, of the front end of the bent pipe.
Specifically, well clamp is still including installing the supporting shoe on the base, sets up the brace table of height and return bend middle section adaptation on the supporting shoe, and a plurality of supporting shoes are used for supporting by tight department not being pressed from both sides in pipe section middle part, avoid the return bend to drop because of weight is too big.
Optimally, an upper ball socket seat is arranged at the upper end of the rear seat, an upper ball socket is arranged on the upper ball socket seat, the front end of a ball joint is a tubular connecting end, an axial channel communicated with the tubular connecting end is arranged at the ball end, a plugging screw and a steel ball are respectively arranged at the front end and the rear end of the axial channel, and a connecting spring is arranged between the plugging screw and the steel ball; the blocking screw is screwed to enable the spring to adjust the position of the rear shaft sleeve in the upper ball socket, so that the ball joint is prevented from freely rotating in the using process to influence the positioning precision.
Optimally, a lower ball socket seat is respectively arranged on the rear seat and the rotating plate, and the lower ball socket is arranged on the lower ball socket seat; furthermore, a compressing channel is arranged in a ball socket seat of the rear seat, the lower ball socket is arranged at an opening at one end of the compressing channel, the other end of the compressing channel is connected with a compressing screw, a compression spring is arranged between the screw and the lower ball socket, and the screw is screwed so that the compression spring compresses a ball head end of a ball stud in the lower ball socket, and the influence of free rotation of the ball stud on positioning precision in the use process is avoided.
Preferably, the rear clamp further comprises a rear supporting block, the rear supporting block is installed at the lower end of the rotating plate, a rear supporting groove matched with the pipe section of the bent pipe is formed in the rear supporting block, and the rear supporting block is used for supporting the pipe section of which the bent rear end is close to the rear flange.
Specifically, set up the bar hole on the back axle bed, the screw that corresponds with bar hole position on the rotating plate adopts the bolt to pass behind the bar hole screw and connects in order to install the back axle bed on the rotating plate, and the back axle bed leads to sliding to making the coaxial adaptation in back axle sleeve, return bend rear end mouth of pipe, back flange position on the back clamp for the direction that the rotating plate is injectd along the bar hole.
Specifically, a key groove with an opposite opening is formed in the butt joint of the rear shaft seat and the rotating plate, a rear positioning key is arranged in the key groove, the key groove and the strip-shaped hole in the rotating plate are consistent in extending direction, the rear shaft seat slides on the rotating plate along the direction limited by the strip-shaped hole through the rear positioning key, and meanwhile the rear shaft seat is prevented from shaking; the rear positioning key and the rotating plate can be further fixed through screws.
Specifically, one end of the rear positioning sleeve is a positioning end matched with the rear end pipe orifice, the other end of the rear positioning sleeve is provided with a handheld rod, and an operator inserts or extracts the rear end pipe orifice into or from the rear positioning sleeve through the handheld rod.
Specifically, the rear clamp further comprises a supporting shaft sleeve, a supporting screw rod and a supporting threaded sleeve, the supporting shaft sleeve is arranged on the upper portion, the front end of the supporting screw rod abuts against the rear end of the rotating plate, the middle section of the supporting screw rod is slidably connected with the supporting shaft sleeve, and the rear end of the supporting screw sleeve is in threaded connection with the supporting threaded sleeve.
Specifically, but support lead screw's middle section and support shaft sleeve pass through T shape key sliding connection, the rear end of support shaft sleeve radially outwards extends the back and radially inwards extends and forms a spacing groove, support the preceding tip of swivel nut and radially outwards extend the spacing ring that forms with the spacing groove adaptation, earlier slide the rear end of support lead screw in to the support shaft sleeve during the installation, then will support the spacing ring and the spacing groove of swivel nut and be connected, then will support the tip of lead screw and be connected with supporting the swivel nut, rotate the support swivel nut in order to back-spin out support lead screw.
Furthermore, the rear end wall of the supporting screw sleeve extends outwards in the radial direction to form a fastening end portion, an axial small screw hole is formed in the fastening end portion, a fastening screw is arranged in the small screw hole, and the fastening screw is screwed after the supporting screw rod is positioned to prevent the screw rod nut from rotating to influence positioning accuracy.
The invention has the beneficial effects that:
the multi-degree-of-freedom positioning welding fixture for the bent pipe, provided by the invention, can be used for carrying out multi-degree-of-freedom adjustment according to the angle of a bent pipe sample piece with a space size, can be used for easily clamping a workpiece, has the advantages of simple structure, low cost, capability of sharing one set of fixture for bent pipes with different space angle sizes and the like, avoids the inconvenience that a new set of fixture needs to be manufactured when the space angle of the sample piece workpiece is changed, and reduces the manufacturing cost of the bent pipe workpiece with different space sizes.
Drawings
FIG. 1 is a schematic view of a multi-degree-of-freedom positioning and welding fixture for bending pipes according to the present invention;
FIG. 2 is a schematic view of the front bushing and the front bushing;
FIG. 3 is a sectional side view of the connection between the clamp holder and the clamp block;
FIG. 4 is a top view;
FIG. 5 is a schematic view of a rear clamp;
FIG. 6 is a sectional view taken along line A-A in FIG. 5;
FIG. 7 is a sectional view taken along line B-B in FIG. 5;
FIG. 8 is an enlarged view of the point C in FIG. 6;
FIG. 9 is a schematic view of a welded workpiece;
the device comprises a bent pipe 1, a front flange 2, a rear flange 3, a base 4, a positioning plate 5, a front shaft sleeve 6, a front shaft seat 7, a front positioning pin 8, a front positioning sleeve 9, a hook-shaped bolt 10, a cylindrical nut 11, a clamping seat 12, a clamping block 13, a long screw rod 14, a guide block 15, a U-shaped frame 16, a support block 17, a rear seat 18, a rotating plate 19, a ball joint 20, a ball stud 21, a screw sleeve 22, a rear shaft sleeve 23, a rear shaft seat 24, a rear positioning pin 25, a butterfly nut 26, a rear positioning sleeve 27, a rear support block 28, a support shaft sleeve 29, a support screw rod 30, a support screw sleeve 31, an upper ball socket seat 32, a blocking screw 33, a steel ball 34, a connecting spring 35, a lower ball socket seat 36, a compression spring 37 and a rear positioning key 38.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the embodiment provides a multi-degree-of-freedom positioning welding fixture for an elbow, which includes an elbow 1 to be welded, a front flange 2, a rear flange 3, a base 4, and a front clamp, a middle clamp, and a rear clamp sequentially disposed at the head, the middle, and the tail of the base; the base extends along the horizontal projection direction of the bent pipe; the front clamp comprises a positioning plate 5, a front shaft sleeve 6, a front shaft seat 7, a front positioning pin 8, a front positioning sleeve 9, a hook bolt 10 and a cylindrical nut 11, wherein the positioning plate is arranged at the head part of the base, as shown in fig. 2, the opening axis of the front shaft sleeve is parallel to the positioning plate and is arranged on the positioning plate through the front shaft seat, a strip-shaped hole is arranged on the front shaft seat, a screw hole corresponding to the strip-shaped hole is arranged on the positioning plate, the front shaft seat is arranged on the positioning plate by connecting the bolt through the strip-shaped hole and the screw hole, the front shaft seat is arranged on the positioning plate, a key groove with an opposite opening is arranged at the butt joint of the front shaft seat and the positioning plate, a front positioning key is arranged in the key groove, and the extension direction of the key groove is consistent with that of the strip-shaped hole on the positioning plate; the rear end wall of the front shaft sleeve extends outwards in the radial direction to form an annular wall coaxial with the front flange, the front flange is provided with a mounting hole, the annular wall is provided with a positioning hole matched with the mounting hole, the front shaft seat and the front flange are coaxially connected and positioned after the front positioning pin sequentially penetrates through the mounting hole and the positioning hole, the end part of the front shaft sleeve is provided with a plurality of lug plates, the lug plates are provided with through holes, the front ends of the through holes are provided with barrel-shaped nuts, the front ends of the hook-shaped bolts are thread sections, the rear ends of the hook-shaped bolts are hook-shaped sections, the thread sections penetrate through the through holes in the lug plates and then are connected with the barrel-shaped nuts, the barrel-shaped nuts are provided with rotating handles, and the rotation of the barrel-shaped nuts is controlled through the rotating handles; one end of the front positioning sleeve is a positioning end matched with the front end pipe orifice, the other end of the front positioning sleeve is provided with a handheld rod, and the positioning end is inserted into the opening of the front shaft sleeve and used for positioning the front end pipe orifice of the bent pipe;
as shown in fig. 3 and 4, the middle clamp includes a clamp holder 12, clamp blocks 13, a long screw 14, a guide block 15, a U-shaped frame 16, and a support block 17, the clamp holder is mounted on the base, the clamp holder is provided with a chute, the clamp blocks with two opposite clamp openings are respectively connected with the chute in a sliding manner, the two clamp blocks are provided with coaxial screw holes, one end of the long screw is provided with two screw sections which are sequentially connected with the screw holes on the two clamp blocks in a threaded manner and have opposite rotation directions, and are used for controlling the clamping and loosening of the two clamp blocks, and the other end of the long screw is provided with a hand wheel; the guide block is arranged on the groove wall of the sliding groove through a screw, and a U-shaped guide opening with the opening direction consistent with the clamping opening direction of the two clamping blocks is arranged on the guide block; the U-shaped frame belt is provided with a U-shaped through groove, and the U-shaped frame is arranged at the rear part of the front clamp and used for supporting a pipe section at the front end of the elbow close to the front flange; the supporting block is arranged on the base, a supporting table with the height matched with the middle section of the bent pipe is arranged on the supporting block, and the supporting block is used for roughly positioning and supporting the bent part in the middle of the pipe section;
as shown in fig. 5, 6, 7 and 8, the rear clamp comprises a rear seat 18, a rotating plate 19, a ball joint 20, a ball stud 21, a screw sleeve 22, a rear shaft sleeve 23, a rear shaft seat 24, a rear positioning pin 25, a butterfly nut 26, a rear positioning sleeve 27, a rear supporting block 28, a supporting shaft sleeve 29, a supporting screw rod 30 and a supporting screw sleeve 31, wherein the rear seat is slidably mounted at the rear end of the base, an upper ball socket seat 32 is arranged at the upper end of the rear seat, an upper ball socket is arranged on the upper ball socket seat, a tubular connecting end is arranged at the front end of the ball joint and connected with the upper end of the rotating plate, a ball head end is arranged at the rear end and matched with the upper ball socket, an axial channel communicated with the pipe mounting connecting end is arranged at the ball head end, a blocking screw 33 and a steel ball 34 are respectively arranged at the front end and the rear end of the axial channel, and a connecting spring 35 is arranged between the blocking screw and the steel ball; screwing the blocking screw to enable the spring to tightly press the steel ball in the upper ball socket, and then adjusting the position of the rear shaft sleeve to prevent the ball joint from freely rotating in the using process to influence the positioning precision; the lower end of the rotating plate and the rear seat are respectively provided with a lower ball socket 36, the ball head ends of the two ball stud bolts are respectively matched with the two lower ball sockets, two ends of the screw sleeve are respectively provided with threaded ports with opposite turning directions, and the threaded ends of the two ball stud bolts are respectively connected with the two threaded ports of the screw sleeve; the rear supporting block is arranged at the lower end of the rotating plate, a rear supporting groove matched with the pipe section of the bent pipe is formed in the rear supporting block, and the rear supporting block is used for supporting the pipe section, close to the rear flange, at the rear end of the bent pipe;
the rear shaft seat slides along the direction limited by the strip-shaped hole relative to the rotating plate to enable the rear shaft sleeve, the rear end pipe orifice of the bent pipe and the rear flange on the rear clamp to be coaxially matched, a key groove with an opposite opening is arranged at the joint of the rear shaft seat and the rotating plate, a rear positioning key 38 is arranged in the key groove, the extending direction of the key groove is consistent with the extending direction of the strip-shaped hole on the rotating plate, the rear shaft seat slides along the direction limited by the strip-shaped hole on the rotating plate through the rear positioning key, and meanwhile, the rear shaft seat is prevented from shaking, wherein the rear positioning key and the rotating plate are fixed through screws;
the front end wall of the rear shaft sleeve extends outwards in the radial direction to form an annular wall matched with the rear flange, the rear flange is provided with a connecting hole, the annular wall is provided with a positioning hole matched with the connecting hole, a rear positioning pin sequentially penetrates through the connecting hole and the positioning hole and then is connected with a butterfly nut 26 to fasten the rear flange and a rear shaft seat, and the rear positioning sleeve is inserted into the opening of the rear shaft sleeve and used for positioning a rear end pipe orifice of the bent pipe; the upper portion is installed to the supporting shaft sleeve, the front end of the supporting screw rod is abutted to the rear end of the rotating plate, the middle section of the supporting screw rod is slidably connected with the supporting shaft sleeve, and the rear end of the supporting screw rod is in threaded connection with the supporting screw sleeve.
The middle section of the supporting screw rod is slidably connected with the supporting shaft sleeve through a T-shaped key, the rear end of the supporting shaft sleeve extends outwards axially and then extends inwards radially to form a limiting groove, the front end of the supporting screw sleeve extends outwards radially to form a limiting ring adaptive to the limiting groove, during installation, the rear end of the supporting screw rod slides into the supporting shaft sleeve firstly, then the limiting ring of the supporting screw sleeve is connected with the limiting groove, the end of the supporting screw rod is connected with the supporting screw sleeve, the supporting screw sleeve is rotated to screw out the supporting screw rod backwards, the rear end wall of the supporting screw sleeve extends outwards radially to form a fastening end, the fastening end is provided with an axial small screw hole, a fastening screw is arranged in the small screw hole, and the fastening screw is screwed after the supporting screw rod is positioned to prevent a screw rod nut from rotating to influence positioning accuracy.
step 4, performing positioning welding according to the requirements of the process specification, and respectively welding the front flange and the rear flange with the bent pipe;
and 5, after welding, taking the pipe fitting off the clamp, wherein the welded pipe fitting is shown in fig. 9.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (10)
1. A multi-degree-of-freedom positioning welding fixture for bent pipes comprises bent pipes to be welded, a front flange and a rear flange, and is characterized by further comprising a base, and a front clamp, a middle clamp and a tail clamp which are sequentially arranged at the head part, the middle part and the tail part of the base;
the base extends along the horizontal projection direction of the bent pipe; the front clamp comprises a positioning plate, a front shaft sleeve, a front positioning sleeve and a hook bolt, wherein the positioning plate is arranged at the head of the base, the axis of an opening of the front shaft sleeve is parallel to the positioning plate and is slidably arranged on the positioning plate through the front shaft base, the rear end wall of the front shaft sleeve radially extends outwards to form an annular wall coaxial with the front flange, a plurality of lug plates are arranged at the end part of the front shaft sleeve, the front end of the hook bolt is a thread section connected with the lug plates through a cylindrical nut, the rear end of the hook bolt is a hook section used for clamping the front flange, and the front positioning sleeve is inserted into the opening of the front shaft sleeve and used for positioning the front end pipe orifice of the bent pipe;
the middle clamp comprises a clamp seat, clamp blocks and a long screw rod, the clamp seat is arranged on the base, the clamp blocks with opposite clamp openings are respectively connected with the clamp seat in a sliding manner, coaxial screw holes are formed in the two clamp blocks, two screw sections which are sequentially in threaded connection with the screw holes in the two clamp blocks and have opposite rotation directions are arranged on the long screw rod and are used for controlling the two clamp blocks to be clamped and loosened, and the plurality of middle clamps are sequentially arranged on the seat and are used for clamping the middle section of the bent pipe;
the rear clamp comprises a rear seat, a rotating plate, ball joints, ball stud bolts, screw sleeves, the rotating plate, a rear shaft sleeve, a rear shaft seat rear positioning pin, a rear positioning sleeve and a butterfly nut, wherein an upper ball socket with a horizontal opening is arranged at the upper end of the rear seat, the rear end of each ball joint is provided with a ball head end matched with the upper ball socket, the front end of each ball joint is provided with a connecting end connected with the upper end of the rotating plate, the lower end of the rotating plate and the rear seat are respectively provided with lower ball sockets, the ball head ends of the two ball stud bolts are respectively matched with the two lower ball sockets, the two ends of each screw sleeve are respectively provided with threaded ports with opposite rotation directions, and the threaded ends of the two ball stud bolts are respectively connected with the two threaded ports of each screw sleeve; the opening axis of the rear shaft sleeve is parallel to the rotating plate and is slidably mounted on the rotating plate through a rear shaft seat, the front end wall of the rear shaft sleeve radially extends outwards to form an annular wall matched with the rear flange, a connecting hole is formed in the rear flange, a positioning hole is formed in the annular wall, a rear positioning pin sequentially penetrates through the connecting hole and the positioning hole and then is connected with a butterfly nut to coaxially fasten the rear flange and the rear shaft sleeve, and the rear positioning sleeve is inserted into the opening of the rear shaft sleeve and used for positioning a rear end pipe orifice of the bent pipe.
2. The multi-degree-of-freedom positioning and welding fixture for the bent pipe according to claim 1, wherein a through hole is formed in the lug, a cylindrical nut is arranged at the front end of the through hole, and a threaded section of the hook bolt penetrates through the through hole in the lug and then is connected with the cylindrical nut.
3. The multi-degree-of-freedom positioning welding fixture for the bent pipe according to claim 1, wherein a strip-shaped hole is formed in the front shaft seat, and a screw hole corresponding to the strip-shaped hole is formed in the positioning plate and connected with the rear screw hole through a bolt to mount the front shaft seat on the positioning plate.
4. The multi-degree-of-freedom positioning welding fixture for the bent pipe according to claim 3, wherein a key groove with an opposite opening is formed in a butt joint of the front shaft seat and the positioning plate, a front positioning key is arranged in the key groove, the key groove and the strip-shaped hole in the positioning plate extend in the same direction, and the front shaft seat slides on the positioning plate along the direction limited by the strip-shaped hole through the front positioning key.
5. The multi-degree-of-freedom positioning and welding fixture for the bent pipe according to claim 1, wherein the middle clamp further comprises a guide block arranged on the clamp base, and a U-shaped guide opening with an opening direction consistent with the clamping opening direction of the two clamp blocks is formed in the guide block.
6. The bending pipe multi-degree-of-freedom positioning welding fixture according to claim 1, wherein the middle clamp further comprises a U-shaped frame with a U-shaped through groove, and the U-shaped frame is mounted at the rear portion of the front clamp.
7. The multi-degree-of-freedom positioning and welding fixture for the elbow according to claim 1, wherein the middle clamp further comprises a support block mounted on the base, and a support platform with a height matched with the middle section of the elbow is arranged on the support block.
8. The multi-degree-of-freedom positioning and welding clamp for the bent pipe according to claim 1, wherein an upper ball socket is arranged at the upper end of the rear seat, the upper ball socket is arranged on the upper ball socket, the front end of a ball joint is a tubular connecting end, an axial channel communicated with the pipe connecting end is arranged at the ball end, a blocking screw and a steel ball are respectively arranged at the front end and the rear end of the axial channel, and a connecting spring is arranged between the blocking screw and the steel ball; the rear seat and the rotating plate are respectively provided with a lower ball socket seat, and the lower ball socket is arranged on the lower ball socket seat; furthermore, a pressing channel is arranged in a ball socket seat of the rear seat, the lower ball socket is arranged at an opening at one end of the pressing channel, the other end of the pressing channel is connected with a pressing screw, and a compression spring is arranged between the screw and the lower ball socket.
9. The multi-degree-of-freedom positioning and welding fixture for the bent pipe according to claim 1, wherein the rear clamp further comprises a rear support block, the rear support block is mounted at the lower end of the rotating plate, and a rear support groove matched with the pipe section of the bent pipe is formed in the rear support block.
10. The multi-degree-of-freedom positioning and welding fixture for the elbow according to claim 1, wherein the rear clamp further comprises a support shaft sleeve, a support screw rod and a support screw sleeve, the support shaft sleeve is mounted at the upper part, the front end of the support screw rod abuts against the rear end of the rotating plate, the middle section of the support screw rod is slidably connected with the support shaft sleeve, and the rear end of the support screw sleeve is in threaded connection with the support screw sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011370626.3A CN112404865B (en) | 2020-11-30 | 2020-11-30 | Multi-degree-of-freedom positioning welding clamp for bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN113399915B (en) * | 2021-07-12 | 2022-12-13 | 中国石油化工股份有限公司 | Non-power-driven fire replacement tool for field oil transportation special-shaped pipe section and off-site prefabricating method |
| CN114918510B (en) * | 2022-04-18 | 2023-11-24 | 上海工程技术大学 | Automatic argon arc welding device for automobile pipe fitting |
| CN114669924A (en) * | 2022-05-11 | 2022-06-28 | 徐州路丁精密制造产业研究院有限公司 | Fixed-angle welding equipment for alloy bent pipe |
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