CN100525992C

CN100525992C - Equipment for automatically welding longitudinal arched seam of large elbow

Info

Publication number: CN100525992C
Application number: CNB200710015457XA
Authority: CN
Inventors: 李文秀
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-30
Filing date: 2007-04-30
Publication date: 2009-08-12
Anticipated expiration: 2027-04-30
Also published as: CN101045274A

Abstract

An automatic welder for the longitudinal arch seam of a great elbow is composed of a power unit, a great elbow locating unit with several fastening plats fixed on drum and having centering function, a welding head locating unit with special supporting frame, and a brake unit.

Description

Equipment for automatically welding longitudinal arched seam of large elbow

Technical field

The present invention relates to a kind of automatic welding device, particularly a kind of equipment that the longitudinal arched seam of large caliber bend is welded automatically.

Background technology

At present, manual welding is adopted in the big elbow weld seam welding of China.Said big elbow is the heavy caliber Steel Tube Special connector that is applied in the high-voltage tube roads such as oil transportation, gas transmission, conveying coal slurry, and caliber is more than 630mm, and these pipelines will bear the above high pressure of 100MPa usually.As shown in Figure 1, big elbow is formed by compression molding, laterally zygomorphic two and half elbow welding processing, four weld seams are arranged, be respectively longitudinal arched weld seam AA ' arc, CC ' arc and longitudinal concave weld seam BB ' arc, DD ' arc, these four sections vertical arc-shaped welding seams are four concentrically ringed four sections equal angles camber lines, and its center of circle is O, names elbow with the angle of angle AOA ' usually, as angle AOA ' is 30 degree, claims that then this elbow is 30 degree elbows.Common elbow has 30 degree, 45 degree, 60 degree, 90 degree, 120 degree, 150 degree and one half bends.

Because big elbow volume is big, weight is big, welding quality requires high, and existing manual welding technology is difficult to reach even high-quality weld seam requirement continuously, and manual welding labour intensity is big, efficient is low, especially the welding of pipe fitting inside, work situation is abominable, damages the healthy of workman, therefore, adopt the big elbow in the automatic welding technique processing pressure piping to become the technical problem that welding technology field presses for solution.

In the automatic welding technique field, existing technology comprises that flush joint welds automatically, automatic welding of circumferential seams etc., as Chinese patent CN2595510 " vibration wheel of road roller disc girth joint robot welding system ", has introduced a kind of automatic welding technique of girth joint; Chinese patent CN2552628 " pipe prefabrication automatic welding machine ", the girth joint automatic welding technique that adopts pipe to rotate.Circumferential weld herein as shown in Figure 2, is to dock the annulus EE ' that forms at the cross section with the steel pipe axis normal; The said arch weld seam of the present invention AA ' arc, CC ' arc are that two and half elbow sheet spares by compression molding vertically dock and form, referring to Fig. 1.Both are different weld seams, and the longitudinal arched weld seam of big elbow can't be as the movement locus of girth welding around the rotation formation ring-type of workpiece self axis, and giving automatically, welding brings great difficulty.Do not find at present the equipment that the longitudinal arched seam to big elbow welds automatically as yet.

Summary of the invention

At the deficiencies in the prior art, the invention provides a kind of equipment for automatically welding longitudinal arched seam of large elbow.

Equipment for automatically welding longitudinal arched seam of large elbow, comprise power set, big elbow positioner, welding head positioner and brake gear, wherein big elbow positioner comprises the some clamps with self-centering and weld seam centering function that are fixed on the cylinder.

Said clamp comprises bottom, left wing, right flank, and integral body is in the shape of the letter V, left wing and right flank symmetry, and the inboard circle of stipulating between the symmetric points arbitrarily of clamp both wings overlaps with the cross section that is installed in this big elbow of 2.

Said clamp left wing and right flank up comprise tangent plane, orthodrome and the stopper of little circular arc, two circles successively from close bottom,

A groove is arranged at said clamp roundlet arc bottom.

Interposition is equipped with a groove below the said clamp bottom.

Said clamp is made by the following method, as shown in Figure 4:

(1) gets an enough big steel plate, mark a vertical line YY ' in the steel plate centre position, get 1 O ₀, cross O ₀Be the vertical line O of YY ' ₀X gets an O on YY ' ₁, O ₂, make O ₀O ₁=3r ₁-r; O ₀O ₂=3r ₂-r, wherein, r ₁Be the cross section exradius length of lowest calibre elbow, r ₂Be the cross section exradius length of maximum caliber elbow, r is a cylinder cross section exradius;

(2) respectively with O ₁Be the center of circle, r ₁Be radius, O ₂Be the center of circle, r ₂Be radius, make two circles, be their outside common tangent HI, be its outside common tangent H ' I ', respectively with circle O on the right side of two circles in the left side of two circles ₁Meet at H, H ' point, with O ₂Meet at I, I ' point;

(3) cross O ₂Be the vertical line JJ ' of YY ', with circle O ₂Meet at J, J ', cross vertical line JK, J ' K ' that J, J ' point is JJ ' respectively, make JK=J ' K ', get JK, the suitable height of J ' K ';

(4) connect K, K ' and prolongation, get a L, L ' respectively, make LK=K ' L ', get LK, the suitable length of K ' L ' in K, K ' the some outside;

(5) at O ₀The last O of X ₀Both sides, get a M, the some M ', make O ₀M=O ₀M ' gets O ₀M, O ₀The length that M ' is suitable:

(6) downcut in turn along above-mentioned line segment and circular arc line, cut out by M, L, K, J, I, H, H ', I ', J ', K ', L ', M ', M point form about polygon clamp to becoming, wherein HH ' is roundlet O ₁Circular arc, JI and I ' J ' be great circle O ₂Circular arc;

Also can after step (6), proceed following steps:

(7) on circular arc HH ', at O ₁Open a sulculus NPP ' N ' under the point;

(8) line segment that marks along above-mentioned steps (7) downcuts in turn, cuts out the symmetrical polygon clamp of being made up of M, L, K, J, I, H, N, P, P ', N ', H ', I ', J ', K ', L ', M ', M point;

Can also behind step (6) or (8), carry out following steps:

(9) on MM ' limit, open a vat STT ' S ';

(10) line segment that marks along above-mentioned steps (9) downcuts in turn, cut out by M, L, K, J, I, H, H ', I ', J ', K ', L ', M ', S ', T ', T, S, M point form about polygon clamp to becoming; Perhaps cut out by M, L, K, J, I, H, N, P, P ', N ', H ', I ', J ', K ', L ', M ', S ', T ', T, S, M point form about polygon clamp to becoming.

The quantity of the big preferred clamp of elbow positioner is 3 to 5, and angle at interval is 15 °.

The head positioning device of longitudinal arched weld seam adopts head rack in the big elbow, head rack comprises first joint, middle segmentum intercalaris, adjustable plate, minor details and base, each joint connects into circular arc in turn, the center of circle of circular arc overlaps with the center of circle of the movement locus of work piece weld seam, the center of circle of welding head support overlaps with the center of circle of the weld seam movement locus of the big elbow of work piece, promptly the radius of this head rack is 1.5D, and D is the cross section maximum gauge of the big elbow of workpiece.

Preferably, head rack comprises first joint, adjustable plate, middle segmentum intercalaris, inferior middle segmentum intercalaris, minor details, and each joint connects into circular arc in turn.

Preferably, first joint and adjustable plate, adjustable plate and middle segmentum intercalaris, middle segmentum intercalaris with time in segmentum intercalaris, all adopt bolting to be connected between segmentum intercalaris and minor details and minor details and the base in inferior.

The head joint of head rack comprises upper cover plate, lower cover, preceding connecting plate, back connecting plate, installing hole and installation shaft, and upper and lower cover plate is fixedlyed connected with forward and backward connecting plate respectively, and installing hole is used for fixing head, and installation shaft is fixedlyed connected with adjustable plate by axis hole.

The adjustable plate of head rack comprises upper cover plate, lower cover, preceding connecting plate, back connecting plate, two perforates are respectively arranged on the forward and backward connecting plate, connect first joint and middle segmentum intercalaris by two holes, by regulating adjustable plate and middle segmentum intercalaris and the installation site of first joint in perforate, finely tune the length and the height of entire bracket, head is accurately positioned in directly over weld seam vertical, improves welding quality.

Segmentum intercalaris and adjustable plate in connection is inferior saved in the centre of head rack, it comprises upper cover plate, lower cover, preceding connecting plate, back connecting plate, former and later two installation shaft, upper and lower cover plate is fixedlyed connected with forward and backward connecting plate respectively, preceding installation shaft is connected with adjustable plate, and back installation shaft is connected with time middle segmentum intercalaris.

Segmentum intercalaris and minor details in connecting are saved in time centre of head rack, it comprises upper cover plate, lower cover, preceding connecting plate, back connecting plate, preceding installation shaft and back installation shaft, upper and lower cover plate is fixedlyed connected with the front and back connecting plate respectively, and preceding installation shaft is connected with middle segmentum intercalaris, and back installation shaft is connected with minor details.

The minor details of head rack are used for connecting time segmentum intercalaris and base, and it comprises forward and backward two connecting plates and fixed block, on the connecting plate of front and back installing hole is arranged; Two connecting plates lay respectively at the fixed block both sides and fixedly connected with fixed block, and installing hole is arranged on the fixed block, and two connecting plate bottom surfaces respectively have an inclined-plane that cooperates with the base inclined-plane.

The base of head rack is used for fixing whole head rack, it comprises two installing plates, it above it the inclined-plane that cooperates with the minor details inclined-plane, installing plate is provided with some installing holes along bevel direction, installing hole is connected by bolt with installing hole on the fixed block, when fixed block is connected with the base installing hole successively by installing hole, can make progress or move down and adjust whole head rack, adjust the height of welding head.

The head positioning device of the outer longitudinal arched weld seam of big elbow can adopt prior art, and the head positioning device of longitudinal arched weld seam in also can adopting promptly adopts the head rack location.

Brake gear comprises two steel wire ropes, two brake cylinders that have brake block, and the drum segment of brake gear comprises spring, static magnet, motor magnet and drum shaft, and steel cable is wrapped between two brake cylinders and the swift, is used for brake; Another root steel wire rope is wrapped between two brake cylinders, is used for both interactions.

Swift and two the axial car system R of brake cylinder cylindrical shape screw threads are used for lay winding wire ropes.

Equipment for automatically welding longitudinal arched seam of large elbow provided by the invention has been broken through the difficult problem that the longitudinal arched weld seam of big elbow can't weld automatically.Fixing and the weld seam automatic centering positioner of its big elbow adopts special-purpose clip arrangement, can be with big elbow self-centering of work piece and automatic centering weld seam, the longitudinal arched weld seam of the big elbow of workpiece is become girth joint; The welding head positioner adopts unique head rack, directly over arch weld seam vertical, guarantees good welding quality in head can being fixed on; Check immediately when brake gear can cut off the power supply at any time, prevent that equipment and workpiece from falling because of self gravitation, guarantee work safety, and after connecting power supply, continue welding from de-energized.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Fig. 1 is big elbow structure schematic diagram

Fig. 2 is the circumferential weld structural representation

Fig. 3 is big elbow positioning device structure schematic diagram

Fig. 4 is a clamp processing method schematic diagram

Fig. 5 is the structural representation of clamp

Fig. 6 is the head rack structural representation

Fig. 7 is the structural representation of the first joint of head rack

Fig. 8 is the structural representation of head rack adjustable plate

Fig. 9 is the structural representation of segmentum intercalaris in the head rack

Figure 10 is the structural representation of head rack time middle segmentum intercalaris

Figure 11 is the structural representation of head rack minor details

Figure 12 is the structural representation of head rack base

Figure 13 is a brake gear drum segment cutaway view

Figure 14 is the structural representation of equipment for automatically welding longitudinal arched seam of large elbow of the present invention

The specific embodiment

As shown in figure 14, equipment for automatically welding longitudinal arched seam of large elbow comprises power set 1, big elbow positioner 2, welding head positioner 3 and brake gear 4, wherein

Power set 1 comprise motor, reductor, drive disk assembly, main shaft 13 and with the concentric and fixedly sleeved cylinder 14 of main shaft in the main shaft outside, the cylinder outside is wound with the steel wire rope 41 that brake gear is sent into, cylinder is fixedlyed connected with big elbow positioner, motor drives the reductor rotation after connecting power supply, reductor drives main shaft by drive disk assembly and rotates, and main shaft drive cylinder and big elbow positioner are around main axis rotation.Drive disk assembly can be chain, belt or gear drive.

Cylinder cylindrical central shaft is got on the bus to the 400mm width and is made 20 all R shape screw threads.The screw thread here can also be taken more all numbers, and usually, car was advisable more than 20 weeks, and vat STT ' the S size on width and the clamp is suitable, and the position correspondence safety shut-down being advisable, can be got the above width of 400mm.

Big elbow positioner 2, as shown in Figure 3, comprise the some clamps 20 that are fixed on the cylinder 14, big elbow positioner has the function of self-centering and weld seam centering, the clamp of positioner, as shown in Figure 5, comprise bottom 201, left wing 202, right flank 203, integral body is in the shape of the letter V, left wing and right flank symmetry, the inboard circle of stipulating between the symmetric points arbitrarily of clamp both wings overlaps with the cross section that is installed in this big elbow of 2, and as shown in Figure 1, the cross section of big elbow promptly is the round AD in the center of circle with Q.Clamp is from up comprising tangent plane HI and H ' I ', orthodrome JI and the J ' I ' of roundlet arc NH and N ' H ', two circles successively near the bottom, and stopper KJ and K ' J ', a groove NPP ' N ' is arranged at roundlet arc bottom, interposition is equipped with a groove STT ' S ' below the bottom, it processes by the following method, as shown in Figure 4:

One, the making clamp is got a 1600mm * 1700mm, thickness is the steel plate of 25mm, as shown in Figure 4, carries out setting-out:

(1) marks a vertical line YY ' in the steel plate centre position, get 1 O in the bottom surface ₀, cross O ₀Be the vertical line O of YY ' ₀X gets an O on YY ' ₁, O ₂, make O ₀O ₁=3r ₁-r=3 * 315mm-400mm=545mm; O ₀O ₂=3r ₂-r=3 * 660mm-400mm=1580mm, wherein, r ₁Be the cross section exradius length of the big elbow of lowest calibre, r ₂Be the cross section exradius length of the big elbow of maximum caliber, r is a cylinder cross section exradius, because, as shown in Figure 1, the following rule of size conforms of big elbow: OD=AD, the diameter length of just big elbow cross circular section AD.The center circle camber line QQ ' of big elbow is positioned at the position of center line of big elbow place annulus, so, rotate around O as long as guarantee the cross-section center Q of big elbow or Q ', can guarantee that longitudinal arched weld seam AA ' arc, CC ' arc rotate around O, thereby longitudinal arched weld seam has been become circular weld;

(3) cross O ₂Be the vertical line JJ ' of YY ', with circle O ₂Meet at J, J ', cross vertical line JK, J ' K ' that J, J ' point is JJ ' respectively, make JK=J ' K '=100mm, play the reliable effect that clamps after big elbow is put into clamp JK baffle plate section, J ' K ' baffle plate section, prevent that big elbow from deviating from;

(4) connect K, K ' and prolong, get a L, L ' respectively, make LK=K ' L '=100mm in K, K ' the some outside, big elbow is put into clamp LK baffle plate section, K ' L ' baffle plate section after, steel plate has enough intensity, comes the very big big elbow of load capacity;

(5) at O ₀The last O of X ₀Both sides, get a M, the some M ', make O ₀M=O ₀M '=760mm can cooperate M M ' with the cylinder bus;

(6) downcut in turn along above-mentioned line segment and circular arc line, cut out the symmetrical polygon of being made up of M, L, K, J, I, H, H ', I ', J ', K ', L ', M ', M point, wherein HH ' is roundlet O ₁Circular arc, JI and I ' J ' be great circle O ₂Circular arc;

On circular arc HH ', at O ₁Open the sulculus NPP ' N ' of a 50mm * 100mm under the point, NN '=PP '=100mm is used for installing liner additional outside big elbow longitudinal joint, prevents burn-through, perhaps implements the back-welding shape weldering;

Open the vat STT ' S ' of a 500mm * 50mm on MM ' limit, SS '=TT '=500mm is used to place the steel wire rope 41 of brake gear.

Two, five clamps that said method is made are arranged according to 15 ° angle, evenly are welded to the outer side bus position of cylinder.

The positioner of making by this method has the function of self-centering and automatic centering weld seam.So-called self-centering is meant when snapping fitted to big elbow on three above clamps, guarantees that its cross-section center line is being on the circle in the center of circle with the alignment of shafts, and the path circumscribed of longitudinal arched weld seam was a ring-type when positioner was rotated, and being convenient to fixedly, head welds.So-called automatic centering weld seam is meant when snapping fitted to big elbow on three above clamps, because three clamps contact with elbow in same arc position, 3 of contact on same circular arc line, determine a face according to 3 on same straight line not, the position, back keeps motionless so the big elbow of work piece is stuck, weld seam has guaranteed the automatic centering of weld seam just in the middle.

Clamp is welded to the outer side bus position of cylinder, several 5 of the piece of clamp, angle at interval is 15 degree.

The big elbow of workpiece is snapped in positioner, the elbow point is welded on the clamp after the assist location, workpiece can firmly be fixed, and regrinds out after finishing welding.

Welding head positioner 3 comprises the head positioning device of the outer longitudinal arched weld seam of big elbow and the head positioning device of the interior longitudinal arched weld seam of big elbow.The head positioning device of the outer longitudinal arched weld seam of big elbow can adopt prior art, with welding head vertical fixing arcuate arc top outside; The head positioning device of interior arch weld seam adopts head rack 30, as shown in Figure 6.

Head rack 30 comprises first joint 31, middle segmentum intercalaris 32, inferior middle segmentum intercalaris 36, adjustable plate 33, minor details 34 and base 35, first joint 31, adjustable plate 33, middle segmentum intercalaris 32, inferior middle segmentum intercalaris 36, minor details 34 connect into circular arc, the center of circle of circular arc overlaps with the center of circle of the movement locus of work piece weld seam, in this embodiment, the center of circle of welding head support overlaps with the center of circle of the weld seam movement locus of the big elbow of work piece, promptly the radius of this head rack is 1.5D, D is the cross section maximum gauge of the big elbow of workpiece, the straight length of AD as shown in Figure 1.

First joint 31 is used to install head, structure as shown in Figure 7, comprise upper cover plate 311, lower cover 312, connecting plate 313, connecting plate 314, installing hole 315 and installation shaft 316, upper and lower cover plate 311,312 is fixedlyed connected with connecting plate 313,314 respectively, installing hole 315 is used for fixing head, and installation shaft 316 is connected with adjustable plate 33 by axis hole 317.

Adjustable plate 33, as shown in Figure 8, comprise upper cover plate 331, lower cover 332, connecting plate 333, connecting plate 334, two perforates 335,336 are respectively arranged on connecting plate 333, the connecting plate 334, connect first joint 31 and middle segmentum intercalaris 32 by two holes 335,336, installation site in perforate 335,336 finely tune the length and the height of entire bracket by regulating adjustable plate with middle segmentum intercalaris and first joint, make head be accurately positioned in weld seam vertically directly over, improve welding quality.

Middle segmentum intercalaris 32 is used for connecting time segmentum intercalaris 36 and adjustable plate 33, as shown in Figure 9, it comprises upper cover plate 321, lower cover 322, connecting plate 323, connecting plate 324, installation shaft 325 and installation shaft 326, upper and lower cover plate 321,322 is fixedlyed connected with connecting plate 323,324 respectively, installation shaft 325 is connected with adjustable plate 33, and installation shaft 326 is connected with time middle segmentum intercalaris 36.

Segmentum intercalaris 36 is used for connecting segmentum intercalaris 32 and minor details 34 in inferior, as shown in figure 10, comprise upper cover plate 361, lower cover 362, connecting plate 363, connecting plate 364, installation shaft 365 and installation shaft 366, upper and lower cover plate 361,362 is fixedlyed connected with connecting plate 363,364 respectively, installation shaft 365 is connected with middle segmentum intercalaris 32, and installation shaft 366 is connected with minor details 34.Adopted the mode of segmentum intercalaris in adding time in the present embodiment, as required, segmentum intercalaris is with the length and the height that shorten head rack or add in the more piece time segmentum intercalaris to increase the height and the length of head rack in can removing time.

Minor details 34 are used for connecting time segmentum intercalaris 36 and base 35, as shown in figure 11, comprise two connecting plates 341,342 and fixed block 343, on the connecting plate 341,342 installing hole 347 are arranged; Two connecting plates lay respectively at the fixed block both sides and fixedly connected with fixed block 343, and installing hole 344 is arranged on the fixed block 343, and connecting plate 341,342 bottom surfaces respectively have an inclined-plane that cooperates with the base inclined-plane 345,346;

Base 35 is used for fixing whole head rack, as shown in figure 12, comprise two installing plates 351,352, it above it the inclined-plane 353,354 that cooperates with minor details 34 inclined-planes 345,346, installing plate 351,352 is provided with some installing holes 355,356,357,358,359 etc. along bevel direction, installing hole 344 is connected by bolt on installing hole and the fixed block 343, when fixed block 343 is connected with base installing hole 355,356,357,358 etc. successively by installing hole 344, whole head rack is adjusted in the translation that can make progress, and adjusts the height of welding head 9.

All adopt bolting to be connected between first joint and adjustable plate, adjustable plate and middle segmentum intercalaris, middle segmentum intercalaris and inferior middle segmentum intercalaris, inferior middle segmentum intercalaris and minor details and minor details and the base.

Above-mentioned head rack is installed on ground or other device by base, makes the frame circular arc portion on the movement locus circumference of work centre line, in head is fixed on directly over arch weld seam vertical.Big elbow workpiece is when circular motion is made at the weld seam center, and its longitudinal arched weld seam is converted into the ring-type weld seam, and fixedly the mode of head is welded, and workpiece motion s, welding head progress into workpiece inside.Less than the big elbow workpiece of 90 degree, can once weld arch weld seam in the whole elbow that finishes; When the angle of big elbow 90 when spending between 180 degree, finish the welding of 90 degree earlier, turn big elbow workpiece then, continue the welding remainder, until the welding whole big elbow that finishes.

Brake gear 4, as Figure 13, shown in Figure 14, comprise steel wire rope 41, steel wire rope 42, brake cylinder 46, brake cylinder 47, the cutaway view of the drum segment of brake gear comprises spring 43, static magnet 45, motor magnet 48, has the cylinder 46 (identical with cylinder 47 structures) and the drum shaft 49 of brake block 44 as shown in figure 13.Steel wire rope 41 is wrapped between cylinder 46, swift 14 and the cylinder 47, and steel wire rope 42 is wrapped between cylinder 46 and the cylinder 47; The canoe of steel wire rope 41 on cylinder as shown in figure 13, an end be fixed on the brake cylinder 46 on and twine several weeks, the other end walk around cylinder be wrapped in after 14 several weeks the brake 47 last several weeks of cylinder and be fixed on the brake cylinder 47 on; Steel wire rope 42 1 ends are fixed on the brake cylinder 46 and twine several weeks, and the other end is walked around brake 47 last several weeks of cylinder and is fixed on the brake cylinder 47.Steel wire rope 41 is opposite with the winding direction of steel wire rope 42.

Steel wire rope 41 is wrapped on cylinder 14 external screw-threads, when cutting off the electricity supply, electromagnetic brake sheet 44 under spring 43 effect with cylinder 46,47 lockings,

steel wire rope

41,42 is fixed motionless, steel wire rope 41 is held the cylinder 14 of power set, cylinder 14 is stopped operating, prevent to cut off the electricity supply or the huge weight of big elbow drives cylinder rotation when having a power failure midway danger.Connect power supply, again after the start, brake block 44 unclamps under the effect of static magnet 45, motor magnet 48, main shaft cylinder 14 clockwise directions rotate and drive steel wire rope 41 rotations, begin to rotate thereby drive brake cylinder 46, steel wire rope 42 rotation under the drive of brake cylinder 46 drives cylinder 47 and rotates; Otherwise, thereby drive steel wire rope 41 drive brake cylinders 47 begins to rotate if main shaft cylinder 14 counterclockwise rotates, steel wire rope 42 rotates under the taking to of brake cylinder 47 and drives cylinder 46 rotations, realize the interaction of cylinder 46,47, thereby automatic welding device can begin to continue welding from the position of outage.

As shown in figure 14, by the support under the spindle bearing holder 56 equipment for automatically welding longitudinal arched seam of large elbow of the present invention is fixed in ground, the big elbow 7 of workpiece of a postwelding is lifted on the clamp 20 of big elbow positioner, and after the spot welding assist location, workpiece can firmly be fixed.

Welding head 8 fix in position that will weld outer longitudinal arched seam AA ' arc are directly over main shaft is vertical on position, the Height Adjustable elevating mechanism, aim at outside weld, like this welding head position of She Zhiing the time make in welding that welding direction is vertical with weld seam all the time, ignition tip and the suitable distance of workpiece maintenance, can guarantee good welding quality.

The welding head 9 of longitudinal arched seam CC ' arc in will welding, as shown in Figure 6, by head rack 30 be fixed to main shaft vertical directly over the position, aim at inside weld.

Connect power supply, motor rotates and drives reductor, reductor drives main shaft by gear drive and rotates, thereby drive cylinder and big elbow positioner rotation, along doing circular motion around main shaft, outer longitudinal arched weld seam AA ' arc is by welding head 8 welding respectively for the outer longitudinal arched weld seam AA ' arc of big elbow and interior arch weld seam CC ' arc; Interior longitudinal arched weld seam CC ' arc is by plumb joint 9 welding, and big elbow is in rotating process, and the welding head support progresses into big elbow inside, finishes the welding of whole big elbow.

In welding process, the circulation of the steel wire rope of brake gear is detoured, and after welding finishes, cuts off the electricity supply, and this moment, brake gear was firmly embraced cylinder, made the entire equipment transfixion, can unload the good workpiece of welding safely.

Claims

1, equipment for automatically welding longitudinal arched seam of large elbow, it is characterized in that, comprise power set, big elbow positioner, welding head positioner and brake gear, wherein big elbow positioner comprises the some clamps with self-centering and weld seam centering function that are fixed on the cylinder, clamp comprises bottom, left wing, right flank, integral body is in the shape of the letter V, left wing and right flank symmetry, and the inboard circle of stipulating between the symmetric points arbitrarily of clamp both wings overlaps with the cross section that is installed in this big elbow of 2; Described clamp left wing and right flank are from up comprising tangent plane, orthodrome and the stopper of little circular arc, two circles successively near the bottom;

Clamp is made by the following method:

(1) gets steel plate, mark a vertical line YY ' in the steel plate centre position, getting O on the steel plate bottom surface and on vertical line YY ' ₀, cross O ₀Be the vertical line O of YY ' ₀X gets an O on YY ' ₁, O ₂, make O ₀O ₁=3r ₁-r; O0O ₂=3r ₂-r, wherein, r ₁Be the cross section exradius length of lowest calibre elbow, r ₂Be the cross section exradius length of maximum caliber elbow, r is a cylinder cross section exradius;

(2) respectively with O ₁Be the center of circle, r ₁Be radius, O ₂Be the center of circle, r ₂Be radius, make two circles, be their outside common tangent HI, be its outside common tangent H ' I ', respectively with circle O on the right side of two circles in the left side of two circles ₁Meet at H, H ' point, with circle O ₂Meet at I, I ' point;

(5) at O ₀The last O of X ₀Both sides, get a M, the some M ', make O ₀M=O ₀M ' gets O ₀M, O ₀The length that M ' is suitable;

(6) downcut in turn along above-mentioned line segment and circular arc line, cut out the symmetrical polygon clamp of being made up of M, L, K, J, I, H, H ', I ', J ', K ', L ', M ', M point, wherein HH ' is roundlet O ₁Circular arc, JI and I ' J ' be great circle O ₂Circular arc.

2, equipment for automatically welding longitudinal arched seam of large elbow as claimed in claim 1 is characterized in that, clamp is made by increasing following steps:

(7) on circular arc HH ', at O ₁Open a sulculus NPP ' N ' under the point;

(8) line segment that marks along above-mentioned steps downcuts in turn, cuts out the symmetrical polygon clamp of being made up of M, L, K, J, I, H, N, P, P ', N ', H ', I ', J ', K ', L ', M ', M point.

As claim 1 or 2 described equipment for automatically welding longitudinal arched seam of large elbow, it is characterized in that 3, clamp is made by increasing following steps:

(9) on MM ' limit, open a vat STT ' S ';

(10) line segment that marks along above-mentioned steps downcuts in turn, cuts out the symmetrical polygon clamp of being made up of M, L, K, J, I, H, H ', I ', J ', K ', L ', M ', S ', T ', T, S, M point; Perhaps cut out the symmetrical polygon clamp of forming by M, L, K, J, I, H, N, P, P ', N ', H ', I ', J ', K ', L ', M ', S ', T ', T, S, M point.

4, equipment for automatically welding longitudinal arched seam of large elbow as claimed in claim 1 is characterized in that, the quantity of clamp is 5, and angle at interval is 15 °.

5, equipment for automatically welding longitudinal arched seam of large elbow as claimed in claim 1 is characterized in that, the welding head positioner adopts head rack.

6, equipment for automatically welding longitudinal arched seam of large elbow as claimed in claim 5, it is characterized in that, head rack comprises first joint, adjustable plate, middle segmentum intercalaris, minor details and base, and each joint connects into circular arc in turn, and the center of circle of circular arc overlaps with the center of circle of the movement locus of work piece weld seam;

First joint comprises upper cover plate, lower cover, forward and backward connecting plate, installing hole and installation shaft, and upper and lower cover plate is fixedlyed connected with forward and backward connecting plate respectively, and installing hole is used for fixing head, and installation shaft is bolted to connection by axis hole and adjustable plate;

Adjustable plate comprises upper cover plate, lower cover, preceding connecting plate, back connecting plate, and two perforates are respectively arranged on the forward and backward connecting plate, connects first joint and middle segmentum intercalaris by two holes;

Save in connecting adjustable plate and minor details the centre, it comprises upper cover plate, lower cover, preceding connecting plate, back connecting plate, preceding installation shaft, back installation shaft, upper and lower cover plate is fixedlyed connected with forward and backward connecting plate respectively, and preceding installation shaft is connected with adjustable plate, and back installation shaft is connected with minor details;

Minor details are used for connecting segmentum intercalaris and base, and it comprises preceding connecting plate, back connecting plate and fixed block, on the forward and backward connecting plate installing hole is arranged; Two connecting plates lay respectively at the fixed block both sides and fixedly connected with fixed block, and installing hole is arranged on the fixed block, and two connecting plate bottom surfaces respectively have an inclined-plane that cooperates with the base inclined-plane;

Base is used for fixing whole head rack, and it comprises two installing plates, is the inclined-plane that cooperates with the minor details inclined-plane above it, and installing plate is provided with some installing holes along bevel direction, and installing hole is connected by bolt with installing hole on the fixed block;

All adopt bolting to be connected between first joint and adjustable plate, adjustable plate and middle segmentum intercalaris, middle segmentum intercalaris and minor details and minor details and the base.

7, equipment for automatically welding longitudinal arched seam of large elbow as claimed in claim 5, it is characterized in that, head rack comprises first joint, adjustable plate, middle segmentum intercalaris, inferior middle segmentum intercalaris, minor details and base, each joint connects into circular arc in turn, and the center of circle of circular arc overlaps with the center of circle of the movement locus of work piece weld seam;

The centre save in connect adjustable plate and time in segmentum intercalaris, it comprises upper cover plate, lower cover, preceding connecting plate, back connecting plate, preceding installation shaft, back installation shaft, upper and lower cover plate is fixedlyed connected with forward and backward connecting plate respectively, and preceding installation shaft is connected with adjustable plate, and back installation shaft is connected with time middle segmentum intercalaris;

Segmentum intercalaris and minor details in connecting are saved in inferior centre, it comprises upper cover plate, lower cover, preceding connecting plate, back connecting plate, preceding installation shaft and back installation shaft, upper and lower cover plate is fixedlyed connected with the front and back connecting plate respectively, and preceding installation shaft is connected with middle segmentum intercalaris, and back installation shaft is connected with minor details;

Minor details are used for connecting time segmentum intercalaris and base, and it comprises preceding connecting plate, back connecting plate and fixed block, on the forward and backward connecting plate installing hole is arranged; Two connecting plates lay respectively at the fixed block both sides and fixedly connected with fixed block, and installing hole is arranged on the fixed block, and two connecting plate bottom surfaces respectively have an inclined-plane that cooperates with the base inclined-plane;

All adopt bolting to be connected between first joint and adjustable plate, adjustable plate and middle segmentum intercalaris, middle segmentum intercalaris and inferior middle segmentum intercalaris, inferior middle segmentum intercalaris and minor details, minor details and the base.

8, equipment for automatically welding longitudinal arched seam of large elbow as claimed in claim 1, it is characterized in that, brake gear comprises two steel wire ropes, two brake cylinders that have brake block, the drum segment of brake gear comprises spring, static magnet, motor magnet and drum shaft, steel cable is wrapped between two brake cylinders and the swift, is used for brake; Another root steel wire rope is wrapped between two brake cylinders, is used for both interactions.