CN109832733A - A kind of processing technology of gold bracelet - Google Patents

Abstract

The present invention relates to bracelet processing technique fields, disclose a kind of processing technology of gold bracelet, include the following steps: S1, stock；S2, film-making；S3, tubulation；S4, it is cut into pieces；S5, brake forming；S6, carving；Step carving is completed using carving machine, carving machine includes fixture, fixture includes the collet and snap ring being fixed on finishing impression machine worktable, locating convex block is provided on collet, the positioning groove with locating convex block cooperation is provided on chuck outer wall, when processing, bracelet is bonded and fixed in snap ring inner ring by glue, carving machine first carves out half decorative pattern on bracelet inner ring, then chuck is removed and overturns 180 degree, it is again that positioning groove and locating convex block is mating, finally carving machine is recycled to carve out half decorative pattern.The present invention can carve out complete symmetrical decorative pattern using carving machine on bracelet internal ring wall, and decorative pattern is complete, does not misplace.

Description

A kind of processing technology of gold bracelet

Technical field

The invention belongs to bracelet processing technique field, in particular to a kind of processing technology of gold bracelet.

Background technique

Gold bracelet is precious metal jewelry common in daily life, very popular because of shape fineness.

A kind of existing gold bracelet is welded by tubular metal head and the tail, and decorative pattern is carved on the internal ring wall of Yu Jinguan, When carving using carving machine to the decorative pattern, due to the feeding of the engraving member of carving machine and the limitation of bite, model is processed It is with limit, the depth of bracelet inner ring half can only be processed, the other half decorative pattern can not carve completion, it is difficult at manufacture on internal ring wall It is carved with the bracelet of full pattern.

Summary of the invention

It, can in view of the deficiencies of the prior art, the present invention intends to provide a kind of processing technology of gold bracelet Good positioning is carried out to gold bracelet, using first carving half, then the method engraving of bracelet overturning 180 degree is identical as the first half The method of pattern forms complete and symmetrical decorative pattern, to carve out complete decorative pattern figure on bracelet internal ring wall using carving machine Case.

Above-mentioned technical purpose of the invention has the technical scheme that a kind of processing work of gold bracelet Skill includes the following steps: S1, stock, prepares the firmly golden bar of 3D；Hard golden lengthy motion picture is made in the firmly golden bar of 3D by S2, film-making；S3, system Hard golden lengthy motion picture is rolled into pipe and seamless welding into seamless long tube by pipe；S4, it is cut into pieces, by seamless long tube according to processing gold The specification of bracelet is cut into the short tube of corresponding length；Short tube brake forming is obtained pipe ring by S5, brake forming, by pipe ring head and the tail Welding forms the bracelet of circular tube shaped；S6, carving, engraving is using bracelet middle section as the decorative pattern of symmetry axis in bracelet inner ring；It is described Step carving is completed using carving machine, and the carving machine includes fixture, and the fixture includes being fixed on finishing impression machine worktable On collet and snap ring, be provided with locating convex block on the collet, be provided on the chuck outer wall and locating convex block cooperates Positioning groove, when processing, bracelet is bonded and fixed in snap ring inner ring by glue, and carving machine first carves out on bracelet inner ring Then 180 degree is removed and overturn to chuck by half decorative pattern, again that positioning groove and locating convex block is mating, finally sharp again Half decorative pattern is carved out with carving machine.

By using above-mentioned technical proposal, the half of symmetrical decorative pattern is first carved using carving machine, then snap ring is turned It is positioned by positioning groove and locating convex block, is carved again using carving machine by the running track of previous engraving again Flower, completes the other half decorative pattern, two halves decorative pattern is mutually spliced to form complete decorative pattern.

Be further arranged to: the step film-making be specifically utilize pelleter the firmly golden bar of 3D is repeatedly flattened through pressure roller and Hard golden lengthy motion picture is made.

By using above-mentioned technical proposal, the firmly golden bar of 3D is flattened into certain thickness when flattening every time, reduces the firmly golden quilt of 3D It flattens excessive situation table to occur, reduces the generation of waste material.

Be further arranged to: the step tubulation is specifically to utilize metal tuber that hard golden lengthy motion picture is passed through rolling, compacting And butt welding and the seamless long tube that is formed.

By using above-mentioned technical proposal, hard golden lengthy motion picture is made seamless long tube using metal tuber, Continuous maching, one It is secondary to process longer pipe fitting, it can cut to form multiple short tubes to make multiple gold bracelets, tubulation is high-quality, high-efficient.

It is further arranged to: further including S7 drawing between S3 and S4, the specific method of drawing is using bench in S3 Obtained seamless long tube carries out drawing, obtains the purification pipe that dimensional accuracy conforms to processing bracelet caliber.

By using above-mentioned technical proposal, using the seamless long tube of bench drawing, by the selection of drawing head so that seamless The outer diameter of long tube and required specification are more accurate, promote the quality for the bracelet that following process goes out.

It is further arranged to: further including S8 polishing between S5 and S6, the specific method of polishing is using polishing machine to bracelet It is polished.

By using above-mentioned technical proposal, using polishing, so that the decorative pattern after subsequent carving in bracelet main body and bracelet Between formed color difference comparison so that bracelet moulding is more beautiful, exquisite.

Be further arranged to: the bench includes rack, the drawing head and stretching device that are set in rack, described Stretching device includes stretching trolley, pipe casting clamp and stretching actuator of the trolley far from drawing head, the rack for driving On be provided with supporting element multiple and along tubular length directional spreding, the supporting element is located at drawing head back to stretching the one of trolley Side, the supporting element include the support rod being set in rack and the Support bracket for being set to support bar top.

It is first with tool that one end pincers of pipe fitting are small by using above-mentioned technical proposal, so that the end is passed through drawing head, Pipe casting clamp clamps the end of pipe fitting, and drawing head is placed in the Support bracket on support rod back to the pipe fitting pipe shaft for stretching trolley On, actuator, which drives, stretches trolley far from drawing head, and the pipe shaft of pipe fitting constantly passes through drawing head so that the caliber control of pipe fitting The pore size in drawing head is made, drawing is completed, worker has liberated worker's both hands, reduced without living pipe shaft with hand rest always Labor intensity.

It is further arranged to: being provided with height adjusting part between the support rod and rack, the height adjusting part includes It adjusts bolt, chuck and adjusts screw hole, the adjusting screw hole is opened in rack and is arranged in a one-to-one correspondence with support rod, described Adjusting bolt thread is connected in adjusting screw hole and screw rod upwardly extends, and the support rod bottom offers the appearance being embedded for chuck Slot is set, the chuck is connect with support rod rotation clamping in accommodation groove and with the screw rod for adjusting bolt.

By using above-mentioned technical proposal, in use, the height of Support bracket is adjusted according to the pipe diameter size of pipe fitting, so that Pipe fitting axle center and drawing head axes alignment, rotation adjust bolt and the screw rod bottom for adjusting bolt are made to rise to push away by chuck Dynamic support rod rises, and the Support bracket height on support rod is driven to rise to promote the height position of pipe fitting when support rod rises It sets；Make the screw rod bottom decline for adjusting bolt to push support rod decline, support by chuck conversely, rotation adjusts bolt The Support bracket height decline on support rod is driven when bar declines to promote the height and position of pipe fitting.

Be further arranged to: the actuator includes the transmission chain being set in rack, driving motor, the stretching trolley Along the length of the rack sliding be set in rack and with transmission chain link, the driving motor and transmission chain link be used for drive Transmission chain is mobile.

By using above-mentioned technical proposal, driving motor rotation drives transmission chain mobile when use, band when transmission chain is mobile The dynamic trolley that stretches is mobile, and driving motor positive and negative rotation can drive stretching trolley to complete to draw far from drawing head, easy to use.

Be further arranged to: the stretching trolley slides along the length of the rack to be set in rack, the stretching trolley On be provided with the grab that can be rotated along perpendicular, the grab is in perpendicular rotation Shi Nengyu transmission chain clamping to making It obtains to pull when transmission chain moves under driving motor drive and stretches trolley far from drawing head.

By using above-mentioned technical proposal, grab rotation is to be stuck on transmission chain, to drive when being driven chain movement Trolley is stretched far from drawing head, completes traction work.

Be further arranged to: the pipe casting clamp includes two fixture blocks, two sliding blocks, two sliding slots and driving member, two cunnings Slot, which is opened in, stretches on trolley and symmetrical as symmetry axis using the central axes of rack length direction, the two separate drawings in sliding slots edge The direction distance of plug is gradually reduced；Two fixture blocks are respectively arranged on a corresponding sliding block, and two sliding blocks are slided respectively Shifting is set in sliding slot, and the clamp port for clamping pipe fitting end is formed between two fixture blocks；The driving member includes transmission Bar and two connecting rods, described connecting rod one end are rotatablely connected with corresponding sliding block, and the other end is rotatablely connected with drive rod one end simultaneously, The grab tail portion is connect with drive rod rotation, and the grab side offers driver slot, is provided with and is led on the stretching trolley Xiang Zhu and limited post, the guide post sliding are set in driver slot, and the limited post and the upper surface of grab tail portion offset Touching, when grab far from drawing head direction to when pulling, the limited post and grab tail portion are detached from and enable grab around guide post Rotation is to be linked into transmission chain.

By using above-mentioned technical proposal, in use, driving member drive two sliding blocks to the direction sliding far from drawing head from And making two fixture blocks close to each other to clamp pipe fitting end, it is good to clamp effect for the synchronous symmetric motion of two fixture blocks；Limited post is to card The tail portion of hook is limited prevent grab is from rotating to can not be suspended on transmission chain, in use, by grab to separate The direction of drawing head pulls, and grab tail portion can be detached from limited post, rotates grab at this time and is stuck in transmission chain, driving motor Rotation drives transmission chain mobile to drive and stretch trolley far from drawing head, and at this moment, since grab is pulled to remote Direction from drawing head is mobile, and grab tail portion drives two link rotatables and drives two sliding blocks along the chute to the direction far from drawing head Sliding, so that distance reduces to clamp pipe fitting end between two fixture blocks.

In conclusion the invention has the following advantages:

1, first carve the half of symmetrical decorative pattern using carving machine, then by snap ring turn by positioning groove and locating convex block into Row positioning, carries out carving by the running track of previous engraving using carving machine again again, completes the other half decorative pattern, two halves decorative pattern Mutually it is spliced to form complete decorative pattern；

2, using polishing, so that forming color difference comparison between decorative pattern after subsequent carving in bracelet main body and bracelet, make to go smoothly Bracelet moulding is more beautiful, exquisite；

3, limited post limits the tail portion of grab prevent grab is used from rotating not being suspended on transmission chain When, grab is pulled to the direction far from drawing head, grab tail portion can be detached from limited post, rotated grab at this time and be stuck in biography In dynamic chain, driving motor rotation drives transmission chain mobile to drive and stretch trolley far from drawing head, and at this moment, due to card Hook is pulled to the direction movement far from drawing head, and grab tail portion drives two link rotatables simultaneously to drive two sliding blocks along the chute to remote Direction sliding from drawing head, so that distance reduces to clamp pipe fitting end between two fixture blocks.

Detailed description of the invention

Fig. 1 is the flow chart of the processing technology of the gold bracelet in the present embodiment；

Fig. 2 is the structural schematic diagram of the present embodiment；

Fig. 3 is enlarged drawing at B in Fig. 2；

Fig. 4 be in the present embodiment supporting element and height adjusting part along the axial sectional view of support rod；

Fig. 5 is enlarged drawing at A in Fig. 2.

Appended drawing reference: 1, rack；11, mounting plate；12, drawing slot；13, track；2, drawing head；3, stretching device；4, it draws Stretch trolley；41, grab；42, bracket；43, guide post；44, limited post；45, driver slot；46, clamping screw；5, pipe casting clamp； 51, fixture block；52, sliding block；53, sliding slot；54, driving member；55, drive rod；56, connecting rod；6, actuator；61, transmission chain；62, it drives Dynamic motor；63, drive sprocket；64, driven sprocket；7, supporting element；71, support rod；72, Support bracket；73, rubber pad；74, block Connect hole；75, accommodation groove；8, height adjusting part；81, bolt is adjusted；82, chuck；83, screw hole is adjusted；84, inserted link；9, cooling dress It sets；91, cooling bath；92, cooling oil pipeline；93, cooling-oil outlet.

Specific embodiment

A kind of processing technology of gold bracelet includes the following steps: S1, stock, prepares the firmly golden bar of 3D；S2, film-making are utilized The firmly golden bar of 3D is repeatedly flattened through pressure roller and hard golden lengthy motion picture is made by pelleter；S3, tubulation, will hard gold length using metal tuber The seamless long tube that piece is formed by rolling, compacting and butt welding；S7, using bench to seamless long tube obtained in S3 Drawing is carried out, the purification pipe that dimensional accuracy conforms to processing bracelet caliber is obtained；S4, it is cut into pieces, by seamless long tube according to institute The specification of processing gold bracelet is cut into the short tube of corresponding length；Short tube brake forming is obtained pipe ring, will managed by S5, brake forming Eye tail welds the bracelet to form circular tube shaped；S8, bracelet is polished using polishing machine.S6, carving are carved in bracelet inner ring It carves using bracelet middle section as the decorative pattern of symmetry axis；Step carving is completed using carving machine, and carving machine includes fixture, fixture packet The collet and snap ring being fixed on finishing impression machine worktable are included, locating convex block is provided on collet, is arranged on the chuck outer wall There is the positioning groove with locating convex block cooperation, when processing, bracelet is bonded and fixed in snap ring inner ring by glue, and carving machine elder generation exists Half decorative pattern is carved out on bracelet inner ring, and then chuck is removed to and overturn 180 degree, again insert positioning groove and locating convex block Cooperation is connect, finally carving machine is recycled to carve out half decorative pattern.

The bench used in S7, as shown in Fig. 2, including that rack 1, drawing head 2 and stretching device, stretching device include It stretches trolley 4, pipe casting clamp 5 and stretches actuator 6 of the trolley 4 far from drawing head 2 for driving.

As shown in Figures 2 and 3, it is fixed with mounting plate 11 in rack 1, drawing slot 12, drawing head 2 are offered on mounting plate 11 It is fixedly installed in drawing slot 12, the rack 1 of the side of drawing head 2 is equipped with three supporting elements being axially distributed along drawing head 2 7, supporting element 7 includes support rod 71 and Support bracket 72, and support rod 71 is vertically arranged and top is integrally fixed with Support bracket 72, Support bracket 72 is V-shaped section along the axial section of drawing head 2, is fixed with rubber on the medial support face in V-shaped section Pad 73.

As shown in Figure 3 and Figure 4,71 bottom end of support rod is connect by height adjusting part 8 with rack 1, and height adjusting part 8 includes It adjusts bolt 81, chuck 82 and adjusts screw hole 83,71 bottom end of support rod offers the blocked hole 74 coaxial with support rod 71, blocks Connecing and offering section at the top of hole 74 is the circular accommodation groove 75 coaxial with support rod 71, adjusts screw hole 83 and is opened in rack 1 And 1 upper and lower surface of rack is penetrated, it adjusts bolt 81 to lower and Shangdi and is threadedly connected to and adjust in screw hole 83, adjust the spiral shell of bolt 81 Bar bottom end has been wholely set inserted link 84, and inserted link 84 is inserted into blocked hole 74 and top has been wholely set chuck 82,82 size of chuck It matches and is embedded in accommodation groove 75 so that adjusting between bolt 81 and support rod 71 in 71 axis of support rod with accommodation groove 75 It is clamped and is rotatablely connected in the horizontal plane upwards.

As shown in Figure 2 and Figure 5, actuator 6 includes the transmission chain 61, the driving motor 62 that are set in rack 1, and rack 1 It is fixed with track 13 in the side of drawing head 2 back to support rod 71, drive sprocket 63, driven sprocket 64 is equipped in track 13, passes Dynamic chain 61 is connected on drive sprocket 63 and driven sprocket 64, and driving motor 62 is fixed in rack 1 and output shaft and drive chain It is coaxially connected to take turns 63.

As shown in Figure 2 and Figure 5, pipe casting clamp 5 includes two fixture blocks 51, two sliding blocks 52, two sliding slots 53 and driving member 54.It passes Moving part 54 includes drive rod 55 and two connecting rods 56.

As shown in Figure 2 and Figure 5, it stretches the sliding of trolley 4 to be set on track 13, two sliding slots 53 are opened in the table for stretching trolley 4 Face and symmetrical as symmetry axis using 13 center line of track, two sliding blocks 52 are slid respectively in corresponding sliding slot 53, fixture block 51 with Sliding block 52 is corresponded and is fixedly connected, and the clamp port for clamping pipe fitting end is formed between two fixture blocks 51.On two sliding blocks 52 It being rotatablely connected with corresponding connecting rod 56 towards one end of drawing head 2, one end of 56 other end of connecting rod and drive rod 55 is rotatablely connected, The other end of drive rod 55 is rotatably connected to grab 41.

As shown in Figure 2 and Figure 5, the two sides on trolley 4 positioned at grab 41 are stretched and are fixed with bracket 42, one of bracket 42 On be fixed with guide post 43, limited post 44 is fixed on another bracket 42, horizontally disposed driver slot 45 is offered on grab 41, The sliding of guide post 43 is set in driver slot 45, and limited post 44 contacts at 41 top of grab to be located at initial position in grab 41 Time limit fabrication hook 41 rotates.When 41 tail portion of grab is pulled through 44 position of limited post, grab 41 can rotate and make grab 41 Hook portion can be linked into transmission chain 61.

As shown in Figure 2 and Figure 5, it is threaded with clamping screw 46 on grab 41, the screw rod bottom of clamping screw 46 can be with Trolley 4 is stretched to offset.

As shown in Figure 2 and Figure 5, cooling device 9 is provided in rack 1, cooling device 9 includes cooling bath 91 and cooling oil Pipeline 92.Cooling oil pipeline 92 is fixed in rack 1 along the distribution of 1 length direction of rack and is located at the side of track 13, and cold Oily oil supply system connection.The cooling-oil outlet 93 of cooling oil pipeline 92 is arranged towards track 13, thus in drawing to pipe fitting Cooling oil is sprayed for cooling down；Cooling bath 91 is fixed in rack 1 and is located at below track 13 for catching cooling oil.

Use principle:

The tool tongs such as pipe fitting end pliers are small, enable the end pass through drawing head 2 and draw to two fixture blocks 51 it Between clamp port in, the pipe shaft of pipe fitting is placed on Support bracket 72, pin stretch trolley 4, to far from drawing head 2 direction It pulls grab 41 that 41 tail portion of grab and limited post 44 are detached from, the hook portion of grab 41 is then rotated, so that hook portion is stuck in transmission In chain 61, this thing, drive rod 55 pulls two connecting rods 56 to make two sliding blocks 52, the 53 direction movement to separate drawing head 2 along the chute, So that two fixture blocks 51 are close to each other, to clamp the end of pipe fitting.

It can be rotated after having pulled grab 41 and push against bolt to push against stretching trolley 4, so that mobile stretching trolley 4 When, Relative sliding does not occur for grab 41 and stretching trolley 4, prevents collet from loosening.

Start driving motor 62, driving motor 62 drives transmission chain 61 mobile, and pulled by grab 41 stretch trolley 4 to Direction far from drawing head 2 is mobile, to drive stretching trolley 4 and pipe fitting end mobile, pipe fitting constantly passes through drawing head 2, to be drawn into predefined size.

When the pipe fitting of drawing different tube diameters, rotation adjusts bolt 81 and Support bracket 72 is moved up and down so that new Pipe fitting be placed on Support bracket 72 after the axis of pipe fitting can be overlapped as much as possible with the axis of drawing head 2.

When stretching the movement of trolley 4, cooling oil is sprayed to carry out to fixture block 51 and pipe fitting using cooling oil pipeline 92 Cooling down protects pipe fitting quality.It is sprayed onto track 13, pipe fitting and stretches having on trolley 4 and flow downward along rack 1 and cold But slot 91 is caught.

This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this All by the protection of Patent Law in the scope of the claims of invention.

Claims (10)

1. a kind of processing technology of gold bracelet, includes the following steps:

S1, stock prepare the firmly golden bar of 3D；

Hard golden lengthy motion picture is made in the firmly golden bar of 3D by S2, film-making；

Hard golden lengthy motion picture is rolled into pipe and seamless welding into seamless long tube by S3, tubulation；

S4, it is cut into pieces, seamless long tube is cut into the short tube of corresponding length according to the specification of processed gold bracelet；

Short tube brake forming is obtained pipe ring by S5, brake forming, and pipe ring head and the tail welding is formed to the bracelet of circular tube shaped；

S6, carving, engraving is using bracelet middle section as the decorative pattern of symmetry axis in bracelet inner ring；

It is characterized by: the step carving is completed using carving machine, the carving machine includes fixture, and the fixture includes The collet and snap ring being fixed on finishing impression machine worktable are provided with locating convex block on the collet, set on the chuck outer wall It is equipped with the positioning groove with locating convex block cooperation, when processing, bracelet is bonded and fixed in snap ring inner ring by glue, carving machine elder generation Half decorative pattern is carved out on bracelet inner ring, then chuck is removed to and overturn 180 degree, again by positioning groove and locating convex block It is mating, finally carving machine is recycled to carve out half decorative pattern.

2. a kind of processing technology of gold bracelet according to claim 1, it is characterised in that: the step film-making is specifically benefit The firmly golden bar of 3D is repeatedly flattened through pressure roller with pelleter and is made.

3. a kind of processing technology of gold bracelet according to claim 2, it is characterised in that: the step tubulation is specifically benefit The seamless long tube for being formed hard golden lengthy motion picture by rolling, compacting and butt welding with metal tuber.

4. a kind of processing technology of gold bracelet according to claim 3, it is characterised in that: further include that S7 is drawn between S3 and S4 It pulls out, the specific method of drawing is to carry out drawing to seamless long tube obtained in S3 using bench, obtains dimensional accuracy and conforms to Process the purification pipe of bracelet caliber.

5. a kind of processing technology of gold bracelet according to claim 4, it is characterised in that: it further include S8 between S5 and S6, The specific method of polishing is to be polished using polishing machine to bracelet.

6. a kind of processing technology of gold bracelet according to claim 4, it is characterised in that: the bench includes rack (1), drawing head (2) and the stretching device being set on rack (1), the stretching device include stretching trolley (4), pipe fitting folder Have (5) and stretch the actuator (6) of trolley (4) far from drawing head (2) for driving, is provided on the rack (1) multiple And along the supporting element of tubular length directional spreding (7), the supporting element (7) is located at drawing head (2) back to the one of stretching trolley (4) Side, the supporting element (7) include the support rod (71) being set on rack (1) and the support being set at the top of support rod (71) Bracket (72).

7. a kind of processing technology of gold bracelet according to claim 6, it is characterised in that: the support rod (71) and rack (1) it is provided between height adjusting part (8), the height adjusting part (8) includes adjusting bolt (81), chuck (82) and adjusting Screw hole (83), the adjusting screw hole (83) are opened on rack (1) and are arranged in a one-to-one correspondence with support rod (71), the adjusting spiral shell Bolt (81) is threadedly connected in adjusting screw hole (83) and screw rod upwardly extends, and support rod (71) bottom is offered for chuck (82) accommodation groove (75) being embedded, the chuck (82) and support rod (71) rotation clamping with accommodation groove (75) in and with adjust spiral shell The screw rod of bolt (81) connects.

8. a kind of processing technology of gold bracelet according to claim 7, it is characterised in that: the actuator (6) includes setting Transmission chain (61), the driving motor (62) being placed on rack (1), the stretching trolley (4) set along the sliding of rack (1) length direction It is placed on rack (1) and is connect with transmission chain (61), the driving motor (62) is connect for driving transmission with transmission chain (61) Chain (61) is mobile.

9. a kind of processing technology of gold bracelet according to claim 8, it is characterised in that: the stretching trolley (4) is along machine The sliding of frame (1) length direction is set on rack (1), and being provided on stretching trolley (4) can be along perpendicular rotation Grab (41), the grab (41) is in perpendicular rotation Shi Nengyu transmission chain (61) clamping so that transmission chain (61) is driving Dynamic motor (62) pull when driving lower mobile and stretch trolley (4) close to or far from drawing head (2).

10. a kind of processing technology of gold bracelet according to claim 9, it is characterised in that: the pipe casting clamp (5) includes Two fixture blocks (51), two sliding blocks (52), two sliding slots (53) and driving member (54), two sliding slots (53) are opened in stretching trolley (4) on and symmetrical as symmetry axis using the central axes of rack (1) length direction, two sliding slots (53) are along far from drawing head (2) direction distance is gradually reduced；Two fixture blocks (51) are respectively arranged on a corresponding sliding block (52), two sliding blocks (52) sliding is set in sliding slot (53) respectively, forms the clamp port for clamping pipe fitting end between two fixture blocks (51)； The driving member (54) includes drive rod (55) and two connecting rods (56), and described connecting rod (56) one end turns with corresponding sliding block (52) Dynamic connection, the other end are rotatablely connected with drive rod (55) one end simultaneously, and grab (41) tail portion and drive rod (55) rotation connect It connects, grab (41) side offers driver slot (45), and guide post (43) and limit are provided on the stretching trolley (4) Column (44), guide post (43) sliding are set in driver slot (45), and the limited post (44) is upper with grab (41) tail portion Surface is inconsistent, and when grab (41) far from drawing head (2) direction to when pulling, the limited post (44) and grab (41) tail portion are de- From rotating grab (41) can around guide post (43) to being linked into transmission chain (61).