CN112658467A

CN112658467A - Two-jaw chuck suitable for thin-wall pipe fitting laser cutting equipment

Info

Publication number: CN112658467A
Application number: CN202110017216.9A
Authority: CN
Inventors: 杨文玉; 丁彤; 秦亮; 姜羽泽
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2021-04-16
Anticipated expiration: 2041-01-07
Also published as: CN112658467B

Abstract

The invention belongs to the technical field related to pipe processing, and discloses a two-jaw chuck suitable for thin-wall pipe fitting laser cutting equipment, which comprises: a main shaft; the main disc is fixed at the end part of the main shaft and is provided with a groove body; the first sliding base and the second sliding base are provided with protruding shafts; a first jaw and a second jaw in engagement with each other; grooves are formed in the rear parts of the first jaw clamping jaw body and the second jaw clamping jaw body, and spring pressing plates are arranged in the grooves; the Archimedes disk comprises two Archimedes spiral grooves with central symmetry, an avoiding groove and a round hole, and the two convex shafts are respectively arranged in the Archimedes spiral grooves; two ends of the telescopic cylinder are respectively and rotatably connected with one end of a pin shaft, the other end of the pin shaft is fixed in the round hole, and the pin shaft penetrates through the avoiding groove and is fixed on the main disc. This application can realize the compliance centering centre gripping to the pipe fitting, and is good to pipe shape adaptability, fixes a position accurately.

Description

Two-jaw chuck suitable for thin-wall pipe fitting laser cutting equipment

Technical Field

The invention belongs to the technical field related to pipe machining, and particularly relates to a two-jaw chuck suitable for thin-wall pipe fitting laser cutting equipment.

Background

The processing of present accurate thin wall pipe is usually accomplished with the mode of laser cutting, and the tubular product cross sectional shape that needs processing in the market is various, like pipe, rectangular pipe, oval pipe etc. for guaranteeing the processing point coincidence of laser beam focus and tubular product, need hold tubular product with the accurate positioning fixture that can adapt to different shape cross sections to the feeding of control tubular product when processing.

Chinese patent CN107984157A discloses a cylinder-driven four-jaw chuck, wherein four jaws of the chuck are respectively connected by four cylinders through hinges, and the relative jaws can move synchronously through a synchronous rotating ring on the chuck body, the jaws are long L-shaped jaws, and the jaw heads of the jaws are provided with longer flat mouths to clamp pipes with complicated cross-sectional shapes. Chinese patent CN109604658A discloses an automatic centering device for a chuck, in which jaws of the chuck are also connected by four cylinders through hinges respectively, but the synchronizing device adopts a gear transmission mechanism, and the chuck includes two sets of meshing gears for controlling the synchronous centering motion of two pairs of jaws respectively. When the gear disc rotates, the bevel gear of the cylinder opposite to the clamping jaw moves to extend according to a certain posture, the clamping jaw is driven to move through the hinge and the connecting rod, and the clamping jaw head of the gear disc is a single small bearing. US6220608B1 discloses a four-jaw chuck, the synchronous jaw-to-jaw movement scheme of the chuck adopts an archimedes spiral disc, a motor drives the archimedes disc to rotate through a gear, so as to drive jaws to do linear centripetal movement under the constraint of a disc surface structure, and the jaws adopted by the chuck are common jaws.

In the first two chuck structures, four cylinders are adopted to respectively drive each clamping jaw, so that the whole chuck has a large size and occupies too much space on a precise thin-walled tube processing machine tool with a small diameter; meanwhile, the flat opening of the claw head of the first chuck is very thin, so that indentation and damage can be caused on the surface of the pipe; the synchronous motion of the second chuck is realized by gear meshing transmission, the requirement on the processing precision of teeth is high, otherwise, factors such as tooth thickness error and the like can cause the reduction of the synchronous precision, in addition, a clamping jaw of the chuck adopts a single bearing, the width is too small, and deflection error can be generated when a pipe with a slightly large size is clamped, so that the clamping and centering performance of the whole chuck is reduced; the Archimedes disk drive of the third chuck is an external meshing drive, the mode needs to measure and control the rotation of the disk body and the Archimedes disk when controlling the motors, and the two motors are not controlled to be decoupled, so the control is also complex, and in addition, the clamping jaws adopt common hard claws, so the clamping adaptability to pipes with different cross-sectional shapes is poor. In addition to the three chucks, according to practical application scenes, a plurality of different laser processing chuck products are available in the market at present, two pairs of two-jaw linkage clamping jaws are mostly adopted by four-jaw chucks of the three chucks, two sets of synchronizing mechanisms are needed for driving and driving, and in the clamping process, because one pair of jaws always clamps a pipe before the other pair of jaws, the friction force generated by the clamping jaws clamped firstly can possibly cause that the clamping jaws clamped later can not center the pipe, so that the centering precision is influenced. Therefore, it is desirable to design a two-jaw chuck suitable for a laser cutting apparatus for thin-walled tubes.

Disclosure of Invention

Aiming at the defects or the improvement requirements of the prior art, the invention provides the two-jaw chuck suitable for the thin-wall pipe fitting laser cutting equipment.

To achieve the above object, according to one aspect of the present invention, there is provided a two-jaw chuck for a thin-walled tube laser cutting apparatus, comprising: a main shaft; the main disc is fixed at the end part of the main shaft, and the groove body runs through the front surface and the rear surface of the main disc along the diameter direction of the main disc; the first sliding base and the second sliding base are both provided with protruding shafts; a first jaw and a second jaw in engagement with each other, the first jaw being secured to the first sliding base and the second jaw being secured to the second sliding base; grooves are formed in the rear portions of the first jaw clamping jaw body and the second jaw clamping jaw body, spring pressing plates are arranged in the grooves and comprise springs and pressing plates, the pressing plates are used for being in contact with the pipe fitting, and the cross section of the end portion of each pressing plate in the direction perpendicular to the pipe fitting is arc-shaped; the Archimedes disk is movably sleeved on the outer surface of the main shaft and arranged on the back of the main disk, the Archimedes disk comprises two Archimedes spiral grooves with central symmetry, an avoiding groove and a round hole, and the two convex shafts respectively penetrate through the groove bodies and are arranged in the Archimedes spiral grooves; the telescopic cylinder is arranged on the back of the Archimedes tray, two end parts of the telescopic cylinder are respectively rotatably connected with one end of a pin shaft, the other end of the pin shaft is fixed on the round hole, and the pin shaft penetrates through the avoiding groove and is fixed on the main tray.

Preferably, the outer edge and the inner edge of the archimedes disk are provided with convex grooves, and the convex grooves are in contact with the main disk.

Preferably, the recess is divided into first cell body and second cell body by spacing hole, the spring accomodate completely in the first cell body, the tip that the clamp plate and spring contact is equipped with leans on the shoulder, lean on shoulder and spring coupling and quilt spacing hole restriction is in the first cell body, the clamp plate is located the second cell body.

Preferably, the distance between the pressure plates in the first and second jaw jaws when not in operation is less than or equal to the distance between the first and second jaw jaws.

Preferably, the front surface of main disc still includes T shape recess, first sliding bottom and second sliding bottom locate in the T shape recess to the realization is to first sliding bottom and second sliding bottom's spacing direction.

Preferably, the first jaw and the second jaw are V-shaped jaws, and a generatrix at the end of the arc surface of the pressing plate is perpendicular to a bisector of an included angle between the V-shaped jaws.

Preferably, the two-jaw chuck further comprises a gear fixedly connected with the main shaft, and the main shaft is driven by the gear to rotate.

Preferably, the two-jaw chuck further comprises a cylindrical roller bearing and a main frame, wherein the cylindrical roller bearing comprises an inner ring fixedly connected with the gear and an outer ring fixedly connected with the main frame.

Preferably, the two-jaw chuck further comprises an air distribution ring, the air distribution ring comprises an inner ring and an outer ring, the inner ring is connected with the main shaft and the air path of the telescopic cylinder, and the outer ring is connected with the main frame and an external air path.

Generally, compared with the prior art, the two-jaw chuck applicable to the laser cutting equipment for the thin-wall pipe fitting, which is provided by the invention, has the following beneficial effects:

1. the Archimedes disc is driven to rotate by the stretching of the stretching cylinder so as to drive the first sliding base and the second sliding base to move, so that the first jaw and the second jaw are synchronously opened and closed, and the positions of the pipe fittings are simultaneously centered along the jaw movement direction and the orthogonal direction through the characteristics of the V-shaped jaw, so that the asynchronous movement of the two jaws and the friction and positioning deviation caused by a four-jaw clamping scheme are avoided;

2. the posture of the to-be-clamped piece can be adjusted in a compliance manner through the spring and the pressing plate, so that the hard torsion which possibly occurs due to uncertain posture of the to-be-clamped piece in the clamping process is avoided, and the shape adaptability of the to-be-clamped piece is good;

3. the limiting hole can limit the stroke of the pressing plate on one hand and can also realize the guiding effect on the pressing plate on the other hand, so that the pressing plate always moves along the radial direction of the main disc, the moving direction of the pressing plate is ensured, and the flexible positioning of the to-be-clamped piece is accurately realized;

4, the T-shaped groove guides and positions the first sliding base and the second sliding base, so that the accuracy of the moving path of the clamping jaw on the T-shaped groove is guaranteed;

5. the air distribution ring is arranged to avoid the air pipe from winding or breaking due to the rotation of the chuck when the air cylinder is directly connected with the air pipe.

Drawings

Fig. 1 schematically shows a two-jaw chuck structure diagram suitable for a thin-wall pipe fitting laser cutting device in the embodiment;

fig. 2 is a schematic diagram showing the explosion structure of the two-jaw chuck suitable for the thin-wall pipe laser cutting equipment of the embodiment;

fig. 3 schematically shows a structural view of the main disc of the present embodiment;

fig. 4 schematically shows a structural view of the first slide base of the present embodiment;

FIG. 5 schematically illustrates a first slide base and a first jaw of the present embodiment;

FIG. 6 schematically illustrates a second slide base and second jaw of the present embodiment;

FIG. 7 schematically illustrates a first jaw of the present embodiment;

fig. 8 schematically shows a structural view of the archimedes disk of the present embodiment;

fig. 9 is a schematic view showing the structure of the archimedes' disc and the telescopic cylinder of the present embodiment;

FIG. 10 schematically illustrates a first jaw of the present embodiment as closed with a second jaw;

FIG. 11 schematically illustrates the first and second jaw jaws of the present embodiment as open;

FIG. 12A schematically illustrates a rectangular tube being placed in the first jaw and the second jaw in a random position in accordance with the present embodiment;

fig. 12B schematically shows a schematic view after correcting the posture of the rectangular tube in the present embodiment;

FIG. 13A schematically illustrates the placing of an oval tube into the first jaw and the second jaw in a random position in accordance with the present embodiment;

fig. 13B schematically shows a diagram after correcting the posture of the elliptical tube in the present embodiment;

fig. 14 schematically shows an installation diagram of the main shaft and the main frame in the embodiment.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:

10-a main shaft;

20-a master disc;

21-a groove body; 22-barrier strip; 23-a stationary part;

30-a first jaw;

31-a groove; 32-a first trough body; 33-a second trough body; 34-a limiting hole; 35-a first sliding base; 36-adjusting bolt fixing blocks; 37-adjusting the bolt; 38-protruding shaft; 39-a bearing;

40-a second jaw;

45-a second sliding base; 46-adjusting bolt fixing blocks; 47-adjusting bolts;

50-pressing plate; 51-shoulder rest; 52-a spring;

60-archimedes disk;

61-archimedes spiral grooves; 62-avoidance groove; 63-round holes; 64-a tongue;

70-a telescopic cylinder;

71, 74-single ear mounting base; 75, 72-pin shaft; 73, 76-retaining ring;

80-cylindrical roller bearings; 90-gear; 100-gas distribution ring; 110-the main frame.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 and 2, the present invention provides a two-jaw chuck for a thin-walled tube laser cutting apparatus, which includes a main spindle 10, a main plate 20, a first sliding base 35, a second sliding base 45, a first jaw 30, a second jaw 40, a spring pressing plate 50, an archimedes plate 60, and an air cylinder 70.

The main shaft 10 is a hollow pipe.

The main disc 20 is disposed at an end portion of the main shaft 10, in this embodiment, threaded holes distributed along a circumference are formed at a front end of the main shaft 10 and distributed on a front end flange surface of the main shaft 10, and the main disc 20 is mounted on the front end flange surface of the main shaft 10 through threaded connection.

As shown in fig. 3, the main tray 20 is provided with diametrical grooves 21 penetrating front and rear surfaces of the main tray 20, the grooves 21 being symmetrical with respect to the center of the main tray 20.

As shown in fig. 4, a first sliding base 35 and a second sliding base 45 are symmetrically arranged on the front surface of the main tray 20 along the center, a protruding shaft 38 is arranged on the rear surface of each of the first sliding base 35 and the second sliding base 45, and a limiting bearing 39 is arranged at the end of the protruding shaft 38.

The first sliding base 35 is provided with a first jaw 30, and the second sliding base 45 is provided with a second jaw 40. The first jaw 30 and the second jaw 40 are V-shaped jaws. In this embodiment, as shown in fig. 5, the first jaw and jaw 30 is preferably a single-tooth V-shaped jaw, the second jaw and jaw 40 is structurally changed into a double-tooth single-tooth jaw, the first jaw and jaw 30 and the second jaw and jaw 40 are mutually matched, a large-fillet transition is formed between the jaw and the base body to reduce stress concentration, a bolt countersunk hole is formed in the upper portion of the base body, and a threaded hole is formed in the top surface of the base body. As shown in fig. 5, the adjusting bolt fixing block 36 is disposed on the base 35, the adjusting bolt 37 is disposed in the adjusting bolt fixing block 36, the threaded end is screwed into the threaded hole on the top surface of the base, the adjusting bolt 37 is rotated to slightly move the jaw base relative to the first sliding base 35, and then the relative position of the jaw base to the jaw is adjusted to ensure the centering clamping precision. Similarly, as shown in fig. 6, the adjusting bolt 47 is disposed in the adjusting bolt fixing block 46, the threaded end is screwed into the threaded hole on the top surface of the base, the jaw base is slightly moved relative to the second sliding base 45 by rotating the adjusting bolt 47, and the relative position between the second jaw 40 and the second sliding base 45 is adjusted by the threaded hole on the top surface of the base.

As shown in fig. 7, grooves 31 are formed in the rear portions of the bases of the first jaw claw 30 and the second jaw claw 40, spring pressing plates are arranged in the grooves 31, each spring pressing plate includes a pressing plate 50, a shoulder 51 is arranged at the joint of the spring 52 and the pressing plate 50, the end of the shoulder 51 is connected with the spring 52, and the section of the end of the pressing plate 50 perpendicular to the pipe fitting is circular arc-shaped.

The recess is divided into first cell body 32 and second cell body 33 by spacing hole 34, spring 52 with lean on shoulder 51 to accomodate completely in first cell body 32, lean on shoulder 51 and spacing hole 34 combined action restriction clamp plate 50's maximum stroke, spacing hole 34 plays certain guide effect to clamp plate 50, lean on shoulder 51 and first cell body 32 lateral wall contactless, avoids the movement resistance too big. The pressing plate 50 is disposed in the second groove 33.

The front surface of the main disc 20 is provided with a T-shaped groove along the direction of the groove body 21, and the first sliding base 35 and the second sliding base 45 are arranged in the T-shaped groove to realize the limiting and guiding of the first sliding base 35 and the second sliding base 45. The T-shaped groove comprises a fixing part 23 and a blocking strip 22, and the fixing part 23 is fixed on the surface of the main bearing disc 20 through a pin or a screw. The surface of the fixing part 23 close to the groove body 21 is provided with an L-shaped groove, and the barrier strip 22 is fixed in the L-shaped groove and protrudes out of the L-shaped groove, so that the fixing part 23 and the barrier strip 22 on two sides of the groove body 21 form a T-shaped groove.

As shown in fig. 8, the archimedes disk 60 is movably sleeved on the outer surface of the main shaft 10 and is disposed on the back of the main disk 20, the archimedes disk 60 includes two archimedes spiral grooves 61, an avoiding groove 62 and a circular hole 63, which are centrosymmetric, and the two protruding shafts 38 respectively penetrate through the groove bodies 21 and are disposed in the archimedes spiral grooves 61. The telescopic cylinder 70 is arranged at the back of the Archimedes disk 60, two end parts of the telescopic cylinder 70 are respectively and rotatably connected with one ends of the

pin shafts

75 and 72, the other end of the pin shaft 75 is fixed on the round hole 63, and the pin shaft 72 penetrates through the avoiding groove 62 and is fixed on the main disk 20. The avoiding groove 62 is a circular arc groove, so that the archimedes disk 60 avoids the pin shaft 72 during movement. In addition to the embodiment shown in fig. 8, the archimedes disk 60 may be provided with grooves or holes in the remaining area, except for the two archimedes spiral grooves 61, the avoiding grooves 62, the circular holes 63, and the inner and outer steps, to reduce the mass of the archimedes disk 60.

In this embodiment, as shown in fig. 9, the lower single-lug mounting base 71 of the telescopic cylinder 70 is connected to the main plate 20 through a pin 72, the retainer ring 73 is used to limit the freedom of axial movement, the pin 72 is in interference fit with the main plate 20, the pin 72 is in clearance fit with the single-lug mounting base 71, and the base 71 can rotate around the pin 72. The upper-end single lug connecting piece 74 is connected with the Archimedes disk 60 through a pin shaft 75, the pin shaft 75 is in interference fit with the round hole 64 on the Archimedes disk 60, the pin shaft 75 is in clearance fit with the upper-end single lug connecting piece 74 of the air cylinder 79, the connecting piece 74 can rotate around the pin shaft 75, and the degree of freedom of axial movement of the connecting piece is limited by the retaining ring 76. When the piston of the telescopic cylinder 70 extends, the archimedes disc 60 is pushed to rotate around the main shaft 10, meanwhile, the single lug mounting base 71 rotates around the pin shaft 72, and the single lug connecting piece 74 rotates around the pin shaft 75, so that the extension of the piston of the telescopic cylinder 70 and the rotation of the archimedes disc 60 are matched.

The outer edge and the inner edge of the Archimedes disk 60 are provided with convex grooves 64, the radius of the main disk 20 is preferably larger than that of the Archimedes disk 60, a chuck cover is arranged on the periphery of the Archimedes disk 60 and connected with the main disk 20, and the convex grooves 64 are in contact with the main disk 20.

The two-jaw chuck further comprises a gas distribution ring 100, the gas distribution ring 100 is installed at the rear end of the main shaft 10, the gas distribution ring 100 comprises an inner ring and an outer ring, the inner ring is connected with the main shaft 10 and the gas circuit of the telescopic cylinder 70, the outer ring is fixedly connected with the main frame and is connected with an external gas circuit, the telescopic cylinder 70 provides gas, and after the telescopic cylinder 70 is directly connected with a gas pipe, the chuck rotates to cause the gas pipe to be wound or pulled off.

The two-jaw chuck further comprises a gear 90 fixedly connected with the main shaft 10, and the main shaft 10 is driven by the gear 90 to rotate.

As shown in fig. 14, the two-jaw chuck further includes a cylindrical roller bearing 80 and a main frame 110, and the cylindrical roller bearing 80 includes an inner ring fixedly connected to the gear and an outer ring fixedly connected to the main frame 110. In this embodiment, the gear 90 is connected to the spindle 10 by a bolt, and the gear 90 is driven by an external gear to drive the spindle 10 to rotate, so as to drive the entire chuck to rotate. The inner ring of the cylindrical roller bearing 80 is engaged with the gear 90 to rotate synchronously, and the outer ring is engaged with the hole of the main frame 110, so that the whole chuck can be installed on the main frame 110.

The two-jaw chuck is particularly suitable for clamping, fixing and rotating the pipe in the laser processing of the pipe, and is matched with a feeding device to realize the continuous feeding and feeding of the pipe.

When in work: when clamping is required, linear movement of the piston of the telescopic cylinder 70 drives rotation of the archimedes disc 60 relative to the main disc 20. When the pressure plate 50 contacts the pipe, the pressure plate 50 extends out of the groove 31 to the maximum stroke under the pressure of the spring 52, when the archimedes disc 60 rotates counterclockwise, the pressure plate 50 is closer to the pipe than the first jaw 30 and the second jaw 40, the pressure plate 50 contacts the pipe first, when the pressure plate 50 compresses the pipe first, the pressing force is provided by the spring 52, the pressure plate 50 does not move centripetally with the first jaw 30 and the second jaw 40 and keeps static, the archimedes disc 60 rotates counterclockwise continuously, the archimedes spiral groove 61 drives the first jaw 30 and the second jaw 40 to move linearly and centripetally synchronously, the spring 52 is compressed continuously until the first jaw 30 and the second jaw 40 clamp the pipe, the staggered tooth structure avoids the problem of jaw interference when clamping the pipe with small pipe diameter, the archimedes disc 60 stops rotating under the counter-acting force of the jaws, the entire chuck completes the clamping of the tubing as shown in fig. 10.

When the pipe needs to be loosened, the archimedes disc 60 rotates clockwise, the first jaw 30 and the second jaw 40 do synchronous centrifugal linear motion, the spring 52 extends, the pressing plate 50 keeps static, after the shoulder 51 contacts the limiting hole 34, the pressing plate 50 does centrifugal linear motion under the driving of the limiting hole 34, the length of the spring 52 does not extend any more, and at the moment, the clamping of the pipe by the chuck is loosened, as shown in fig. 11.

As shown in fig. 12A, when a rectangular tube is placed between the first jaw and the second jaw, the clamp plate 50 will contact the tube first in the process of the centering motion of the two jaws, which can be approximated to point-surface contact, and the contact force is along the normal direction of the contact surface, so that the contact force between the two shoulders 51 and the rectangular tube forms a moment, the rectangular tube rotates under the action of the moment to adjust the posture, and at the same time, the first jaw and the second jaw 30 and the second jaw 40 continue to move centripetally, the spring 52 applies pressure to the clamp plate 50, so that the point-surface contact of the clamp plate 50 and the rectangular tube is changed into line-surface contact, the magnitude of the adjustment moment becomes 0, and at this time, after the posture adjustment of the rectangular tube is completed, the clamp plate 50 does not continue to move centripetally with the first jaw and the second jaw 30 and the jaw 40, and the; after one side of the V-shaped jaws of the first jaw 30 and the second jaw 40 contacts the rectangular tube, the center of the rectangular tube is pushed to the center of the chuck by the continuous centripetal motion, and in this process, the pressing plate 50 will follow the position of the tube through the spring 52, so as to complete the centering and positioning of the rectangular tube, as shown in fig. 12B, so that the centering and posture-fixing clamping of the rectangular tube is completed.

As shown in fig. 13A, an elliptical tube is placed between the first jaw and the second jaw and the jaw 40 in a random posture, during the centering motion of the two jaws, the pressing plate 50 will contact the tube first, at this time, the contact can be approximated to point-surface contact, the contact force is along the normal direction of the contact surface, so that the contact force of the two pressing plates 50 and the elliptical tube forms a moment, the elliptical tube rotates under the action of the moment to adjust the posture, at the same time, the first jaw and the second jaw 30 and the jaw 40 continue centering motion, the spring 52 applies pressure to the pressing plate 50 until the contact line of the elliptical tube and the two shoulders 51 is parallel to the motion direction of the spring pressing plate 50, the adjustment moment of the spring pressing plate 50 to the elliptical tube is 0, at this time, the posture of the elliptical tube is adjusted, as shown in fig. 13B, and the post centering process is similar to the clamping of.

To sum up, this application drives the rotation of archimedes dish through telescopic cylinder's flexible and then drives shifting up and moving down of first sliding bottom and second sliding bottom, realizes that first jack catch of keeping silent and second keep silent the synchronous opening of jack catch and close, carries out centering centre gripping to tubular product, realizes treating the gesture adjustment of holder through the clamp plate simultaneously, and is good to tubular product shape adaptability, fixes a position accurately.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A two-jaw chuck suitable for thin-wall pipe fitting laser cutting equipment is characterized by comprising:

a main shaft (10);

the main disc (20) is fixed at the end part of the main shaft (10), and a groove body (21) runs through the front surface and the rear surface of the main disc (20) along the diameter direction of the main disc (20);

the device comprises a first sliding base (35) and a second sliding base (45), wherein the first sliding base (35) and the second sliding base (45) are respectively provided with a protruding shaft (38);

a first jaw (30) and a second jaw (40) in engagement with each other, the first jaw (30) being secured to the first slide base (35) and the second jaw (40) being secured to the second slide base (45);

grooves are formed in the rear portions of the base bodies of the first jaw clamping jaw (30) and the second jaw clamping jaw (40), spring pressing plates are arranged in the grooves and comprise pressing plates (50) and springs (52), the pressing plates (50) are used for being in contact with the pipe fitting, and the cross section of the end portion of each pressing plate (50) in the direction perpendicular to the pipe fitting is arc-shaped;

the Archimedes disk (60) is movably sleeved on the outer surface of the main shaft (10) and arranged on the back of the main disk (20), the Archimedes disk (60) comprises two Archimedes spiral grooves (61), an avoiding groove (62) and a round hole (63) which are centrosymmetric, and the two convex shafts (38) respectively penetrate through the groove bodies (21) and are arranged in the Archimedes spiral grooves (61);

locate telescopic cylinder (70) at archimedes dish (60) back, the both ends of telescopic cylinder (70) rotate the one end of connecting pin axle (75, 72) respectively, the other end of pin axle (75) is fixed in round hole (63), round pin axle (72) pass dodge groove (62) and be fixed in main disc (20).

2. The two-jaw chuck according to claim 1, characterized in that the outer and inner edges of the archimedean disc (60) are provided with tongues (64), said tongues (64) being in contact with the main disc (20).

3. The two-jaw chuck according to claim 1, wherein the groove is divided into a first groove body and a second groove body by a limiting hole, the spring (52) is completely accommodated in the first groove body, a shoulder (51) is arranged at the end of the pressing plate (50) contacting with the spring (52), the shoulder (51) is connected with the spring (52) and limited in the first groove body by the limiting hole, and the pressing plate (50) is arranged in the second groove body.

4. The two-jaw chuck according to claim 3, characterized in that the distance between the pressure plates (50) in the first jaw (30) and the second jaw (40) is smaller than or equal to the distance between the first jaw (30) and the second jaw (40) when not in operation.

5. The two-jaw chuck according to claim 1, characterized in that the front surface of the main plate (20) further comprises a T-shaped groove, the first sliding base (35) and the second sliding base (45) being arranged in the T-shaped groove to achieve a limited guidance of the first sliding base (35) and the second sliding base (45).

6. The two-jaw chuck according to claim 1, wherein the first jaw (30) and the second jaw (40) are V-shaped jaw, and a generatrix of an end of the arc surface of the pressure plate (50) is perpendicular to a bisector of an included angle of the V-shaped jaw.

7. The two-jaw chuck according to claim 1, further comprising a gear (90) fixedly connected to the spindle (10), wherein the spindle (10) is rotated by the gear (90).

8. The collet chuck according to claim 1, further comprising a cylindrical roller bearing (80) and a main frame (110), the cylindrical roller bearing (80) comprising an inner race fixedly connected to the gear and an outer race fixedly connected to the main frame (110).

9. The two-jaw chuck according to claim 8, further comprising a gas distribution ring (100), the gas distribution ring (100) comprising an inner ring and an outer ring, wherein the inner ring is connected to the gas circuit of the spindle (10) and the telescopic cylinder (70), and the outer ring is connected to the main frame (110) and an external gas circuit.