CN113319520A

CN113319520A - Jaw structure and chuck using same

Info

Publication number: CN113319520A
Application number: CN202110742471.XA
Authority: CN
Inventors: 牟燕峰; 钟德峰
Original assignee: Changzhou Biyoute Machinery Technology Co ltd
Current assignee: Changzhou Biyoute Machinery Technology Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-08-31

Abstract

The application relates to a chuck of jack catch structure and applied jack catch structure uses in the field of pipe fitting anchor clamps technique, and it includes movable jack catch, still includes slidable one-level slider and slides the second grade slider that sets up on the one-level slider, the one-level slider with the slip direction of second grade slider is the same, movable jack catch installs on the second grade slider. This application has the effect that makes the removal stroke of movable jack catch obtain increasing and the centre gripping scope increase to the pipe fitting.

Description

Jaw structure and chuck using same

Technical Field

The application relates to the field of pipe fitting anchor clamps technique, especially relate to a jack catch structure and use chuck of jack catch structure.

Background

The chuck is often used to clamp and fix the pipe on the laser pipe cutting machine. The movable clamping jaws uniformly distributed on the chuck are used for clamping the pipe fitting, so that the pipe fitting can be conveniently cut by the laser pipe cutting machine.

The chuck in the related technology mainly comprises a chuck body, a movable jaw and a jaw driving mechanism. In addition, the chuck body is provided with a sliding groove and a sliding block positioned in the sliding groove to slide, the movable clamping jaw is fixed on the sliding block, the sliding block is driven to move by the clamping jaw driving mechanism, and then the sliding block drives the movable clamping jaw to move so as to clamp the pipe fitting tightly.

In view of the above-mentioned related art, the inventor believes that the moving stroke of the movable jaw is limited by the sliding path of the sliding chute and the sliding block, so that the movable jaw has the defects of short stroke and small clamping range of the pipe fitting.

Disclosure of Invention

In order to improve the stroke that movable jack catch exists short and to the little problem of the centre gripping scope of pipe fitting, this application provides a jack catch structure and uses the chuck of jack catch structure.

First aspect, this application provides a pawl structure, adopts following technical scheme:

the utility model provides a jack catch structure, includes movable jack catch, still includes slidable one-level slider and the second grade slider of slip setting on the one-level slider, the one-level slider with the slip direction of second grade slider is the same, movable jack catch is installed on the second grade slider.

Through adopting above-mentioned technical scheme, the activity jack catch is installed on the second grade slider, because the slidable of one-level slider itself and the setting of second grade slider slip are on the one-level slider, and the slip direction of one-level slider and second grade slider is the same to one-level slider and second grade slider accumulate and have the effect that makes total glide path increase, consequently make the removal stroke of activity jack catch obtain increasing and the centre gripping scope increase of pipe fitting.

Optionally, a second-stage sliding groove for allowing the second-stage sliding block to slide is formed in the first-stage sliding block, and limiting blocks are arranged on two sides of the second-stage sliding block on the first-stage sliding block.

Through adopting above-mentioned technical scheme, the second grade slider passes through the second grade spout and slides on the first grade slider, and makes the second grade slider slide on the first grade slider steadily and do not break away from through two stoppers.

Optionally, the second-stage slider is provided with a positioning groove, and the movable clamping jaw is provided with a positioning block which is matched and clamped in the positioning groove.

Through adopting above-mentioned technical scheme, the cooperation card of locating piece and constant head tank is gone into and is played the effect of advance positioning activity jack catch, makes things convenient for the operator to fix the activity jack catch on the second grade slider.

In a second aspect, the present application provides a chuck with a jaw structure, which adopts the following technical solution:

the chuck with the jaw structure comprises a chuck body, wherein the jaw structure is arranged on the periphery of the chuck body in a plurality of positions, and a one-level sliding groove for sliding a one-level sliding block is formed in the chuck body.

Through adopting above-mentioned technical scheme, one-level slider slides on the chuck body through one-level spout steadily.

Optionally, the quantity of jack catch structure is the even number on the chuck body, and the jack catch structure that the quantity is the even number is followed the week side equipartition of chuck body passes through central connecting straight line two jack catch structures at chuck body center are established to a pair of, consequently total a plurality of to the jack catch structure, and a plurality of all not on the coplanar to the jack catch structure.

Through adopting above-mentioned technical scheme, the jack catch structure sets up in pairs, and each pair jack catch structure all is not on the coplanar, all staggers the setting each other, and reducible each pair jack catch structure takes place the condition of interfering each other, is favorable to the jack catch structure more stable and wider centre gripping to the pipe fitting.

Optionally, still include actuating mechanism, actuating mechanism installs on the chuck body, actuating mechanism includes driving source, one-level transmission unit and second grade transmission unit, and the driving source provides the driven power of one-level transmission unit and second grade transmission unit, and one-level transmission unit is used for the drive the one-level slider slides, and second grade transmission unit is used for the drive the second grade slider slides.

By adopting the technical scheme, the driving source is used as a total power source and provides power for the transmission of the primary transmission unit and the secondary transmission unit; firstly, the primary transmission unit drives the primary sliding block to slide on the chuck body, and on the basis of the sliding of the primary sliding block, the secondary transmission unit drives the secondary sliding block to slide on the primary sliding block.

Optionally, the driving source is including driving actuating cylinder and drive fluted disc, it installs to drive the rotation of fluted disc on the chuck body, the one end that drives actuating cylinder articulates on the chuck body, the other end that drives actuating cylinder articulates on driving the fluted disc.

Through adopting above-mentioned technical scheme, drive actuating cylinder promotes the drive fluted disc and rotates on the chuck body, provides the required power of one-level transmission unit and the transmission of second grade transmission unit through the rotation of drive fluted disc, and then orders about one-level slider and second grade slider and slide in succession.

Optionally, a tail connecting lug is fixedly connected to the body of the driving cylinder, a tail connecting rod is arranged on the chuck body, a tail extension rod penetrating through the tail connecting lug is arranged at one end, away from the chuck body, of the tail connecting rod, and a tail hoop is sleeved at one end, penetrating through the tail connecting lug, of the tail extension rod;

the threaded connection has the head engaging lug on driving cylinder's the piston rod, be provided with the head connecting rod on the drive fluted disc, the one end that the drive fluted disc was kept away from to the head connecting rod has the head extension rod that passes the head engaging lug, the head hoop has been cup jointed to the one end that the head extension rod passed the head engaging lug.

Through adopting above-mentioned technical scheme, the body that will drive actuating cylinder articulates on the chuck body, and the piston rod that will drive actuating cylinder articulates the structure on driving the fluted disc for driving actuating cylinder can be stable and nimble order about and drive the reciprocating rotation of fluted disc on the chuck body.

Optionally, one-level transmission unit includes one-level transmission fluted roller, the holding tank that supplies one-level transmission fluted roller to put into has on the chuck body, one-level transmission fluted roller rotates to be installed in the holding tank, one end of one-level transmission fluted roller with the meshing of drive fluted disc mutually, have on the lateral wall of one-level slider with the one-level transmission tooth's socket that the other end of one-level transmission fluted roller meshed mutually.

Through adopting above-mentioned technical scheme, the drive fluted disc rotates, through the meshing of drive fluted disc and one-level transmission fluted roller, can order about one-level transmission fluted roller and rotate, and the meshing of rethread one-level transmission fluted roller and one-level transmission tooth's socket can order about one-level slider and slide on the chuck body.

Optionally, the secondary transmission unit includes a secondary transmission toothed roller, the primary slider has an accommodating hole for the secondary transmission toothed roller to be placed in, and the secondary transmission toothed roller is rotatably mounted in the accommodating hole;

an intermediate transmission block is arranged on one side, opposite to the second-stage sliding block, of the chuck body, a hidden groove for the intermediate transmission block to be placed is formed in the chuck body, and the intermediate transmission block is fixedly connected in the hidden groove;

the middle transmission block is provided with a middle transmission tooth groove meshed with one side of the secondary transmission tooth roller, and the secondary sliding block is provided with a secondary transmission tooth groove meshed with the other side of the secondary transmission tooth roller.

Through adopting above-mentioned technical scheme, on the gliding basis of one-level slider, the second grade transmission fluted roller in the one-level slider slides along with the one-level slider, and at this in-process, because the meshing of the middle transmission fluted roller on second grade transmission fluted roller and the middle transmission piece can order about the rotation of second grade transmission fluted roller, under the second grade transmission fluted roller pivoted condition, because the meshing of the second grade transmission fluted roller on second grade transmission fluted roller and the second grade slider, and then can order about the second grade slider and slide on the one-level slider.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the driving cylinder provides power for driving the fluted disc to rotate and further provides power for driving the first-stage transmission unit and the second-stage transmission unit, the first-stage transmission unit drives the first-stage sliding block to slide on the chuck body, and the second-stage transmission unit drives the second-stage sliding block to slide on the first-stage sliding block on the basis of sliding of the first-stage sliding block;

2. the positioning block is clamped in the positioning groove in a matched manner to play a role of pre-positioning the movable clamping jaw, so that an operator can conveniently and accurately fix the movable clamping jaw on the secondary sliding block;

3. the clamping jaw structures are arranged in pairs, and the clamping jaw structures are arranged in a staggered mode, so that the interference between the clamping jaw structures can be reduced, and the clamping jaw structures can clamp the pipe fitting more stably and more extensively.

Drawings

In fig. 1, a is a schematic diagram of a movable jaw with a first specification in the embodiment of the application, and b is a schematic diagram of a movable jaw with a second specification.

In fig. 2, c is a schematic diagram of the first-stage sliding block and the second-stage sliding block matched with the movable jaws of the first specification, and d is a schematic diagram of the first-stage sliding block and the second-stage sliding block matched with the movable jaws of the second specification.

FIG. 3 is a schematic view of a chuck body in an embodiment of the present application.

Fig. 4 is a schematic diagram of a structure for mounting the jaws on the chuck body in the embodiment of the present application.

Fig. 5 is a schematic view of a drive mechanism mounted on a chuck body in an embodiment of the present application.

Fig. 6 is a schematic view of a drive mechanism in an embodiment of the present application.

Fig. 7 is a schematic view of a drive source in the embodiment of the present application.

Fig. 8 is a schematic view of a primary transmission unit and a secondary transmission unit in an embodiment of the present application.

Reference numerals: 1. a movable jaw; 101. a front-end nip roller; 102. a rear end bracket; 103. a tilting bracket; 2. a first-stage slide block; 21. a secondary chute; 22. an accommodation hole; 3. a secondary slide block; 31. positioning a groove; 4. a chuck body; 41. a first-stage chute; 42. accommodating grooves; 43. a hidden slot; 5. a limiting block; 6. positioning blocks; 7. a drive source; 71. a driving cylinder; 72. a driving fluted disc; 8. a primary transmission unit; 81. a primary drive gear roller; 82. a primary drive tooth slot; 9. a secondary transmission unit; 91. a secondary transmission toothed roller; 92. an intermediate transmission block; 93. an intermediate drive tooth slot; 94. a secondary drive tooth slot; 10. the tail part is connected with the lug; 11. a tail connecting rod; 111. a tail extension rod; 12. a tail hoop; 13. a head connecting lug; 14. a head connecting rod; 141. a head extension rod; 15. a head hoop.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses a clamping claw structure.

Referring to fig. 1, a jaw structure includes a movable jaw 1, in the related art, the movable jaw 1 has two specifications, and the first movable jaw 1 is composed of a rear end bracket 102 and a front end nip roller 101 rotatably mounted on the rear end bracket 102; the second movable jaw 1 is constructed by a rear end bracket 102, an inclined bracket 103 integrally formed with the rear end bracket 102, and a front end nip roller 101 rotatably mounted on the inclined bracket 103. The front-end clamping rollers 101 in the movable jaws 1 of both specifications are used for clamping the pipe.

For the movable claw 1 only consisting of the rear end bracket 102 and the front end clamping roller 101, the rear end bracket 102 and the front end clamping roller 101 are positioned on the same plane, namely, the plane where the top surface and the bottom surface of the rear end bracket 102 are positioned is coplanar with the tangent plane of the front end clamping roller 101; for the movable claw 1 composed of the rear end bracket 102, the inclined bracket 103 and the front end nip roller 101, the front end nip roller 101 is lifted up due to the inclined bracket 103, so that the front end nip roller 101 is integrally higher than the rear end bracket 102, and the rear end bracket 102 and the front end nip roller 101 are located on different planes.

Referring to fig. 2, the clamping claw structure further comprises a first-stage sliding block 2 and a second-stage sliding block 3, and the longitudinal sections of the first-stage sliding block 2 and the second-stage sliding block 3 are of inverted T-shaped structures. One-level slider 2 self slidable, link up's second grade spout 21 has been seted up along self slip direction on the one-level slider 2, and the cross-section of second grade spout 21 is square, and second grade slider 3 is located second grade spout 21 and can slide in second grade spout 21, therefore second grade slider 3 is the same with the slip direction of one-level slider 2.

The two sides of the first-level sliding block 2, which are positioned at the opening of the second-level sliding groove 21, are provided with limiting blocks 5, the two limiting blocks 5 extend along the sliding direction of the first-level sliding block 2 and the second-level sliding block 3, and the two limiting blocks 5 are fixed on the first-level sliding block 2 through screws. One side that two stopper 5 are close to each other all extends towards second grade slider 3 to be used for restricting second grade slider 3 and break away from second grade spout 21, make second grade slider 3 can slide on one-level slider 2 steadily.

Referring to fig. 1 and 2, a positioning groove 31 is formed in one side of the second-stage slider 3, which faces away from the first-stage slider 2, the positioning groove 31 extends along a sliding direction perpendicular to the second-stage slider 3, two ends of the positioning groove 31 penetrate through the second-stage slider 3, a positioning block 6 is integrally formed on the rear-end support 102 of the movable jaw 1, and the positioning block 6 is clamped into the positioning groove 31 in a matching manner to pre-position the movable jaw 1. After the positioning block 6 on the movable clamping jaw 1 is clamped into the positioning groove 31 on the second-stage sliding block 3 in a matching manner, the movable clamping jaw 1 is fixed on the second-stage sliding block 3 through a screw, and the fixing convenience and accuracy of the movable clamping jaw 1 can be effectively improved.

The implementation principle of this application embodiment's a gripper structure does: on the basis of one-level slider 2 self slidable, second grade slider 3 can continue to slide on one-level slider 2, and one-level slider 2 is the same with second grade slider 3's slip direction, and this is equivalent to one-level slider 2 and second grade slider 3 and accumulates and have more slip paths, consequently makes the holistic travel of activity jack catch 1 obtain increasing and increase to the centre gripping scope of pipe fitting.

The embodiment of the application also discloses a chuck applying the jaw structure.

Referring to fig. 3 and 4, a chuck with a jaw structure includes a chuck body 4, in this embodiment, the chuck body 4 is a circular structure, and a first through circular hole is formed in the middle of the chuck body. In the present embodiment, the number of the jaw structures is even, specifically, the number of the jaw structures is four, and the four jaw structures are uniformly distributed along the peripheral side of the chuck body 4.

One-level spout 41 has all been seted up in the position department that lies in four jack catch structures on chuck body 4, chuck body 4 is run through at the center and both ends that chuck body 4 is all aimed at to one-level spout 41 extending direction, and the longitudinal section of one-level spout 41 is the type of falling T structure, and the cooperation of one-level slider 2 slides in one-level spout 41 to the center of chuck body 4 is aimed at to the slip direction of one-level slider 2 and second grade slider 3, so that movable jack catch 1 will be located the body centre gripping steadily of chuck body 4 center.

Referring to fig. 4, in addition, two jaw structures having a center connecting straight line passing through the center of the chuck body 4 are provided as one pair among the four jaw structures, and thus two pairs of jaw structures are shared. According to the two pairs of clamping jaw structures, the two movable clamping jaws 1 on one pair of clamping jaw structures all adopt a first specification, and the two movable clamping jaws 1 on the other pair of clamping jaw structures all adopt a second specification, so that the movable clamping jaws 1 on the two pairs of clamping jaw structures are not on the same plane, staggered structures are formed between the movable clamping jaws, and when a pipe fitting is clamped, the interference between the two pairs of clamping jaw structures can be reduced, and the clamping jaw structures are more stable and wider for clamping the pipe fitting.

Referring to fig. 5 and 6, a chuck employing a jaw structure further includes a driving mechanism mounted on the chuck body, the driving mechanism including a driving source 7, a primary transmission unit 8, and a secondary transmission unit 9. The driving source 7 is used as a total power source and provides power transmitted by the primary transmission unit 8 and the secondary transmission unit 9; firstly, the primary transmission unit 8 drives the primary slider 2 to slide on the chuck body 4, and the secondary transmission unit 9 drives the secondary slider 3 to slide on the primary slider 2 on the basis of the sliding of the primary slider 2.

Referring to fig. 6 and 7, the driving source 7 includes a driving cylinder 71 and a driving toothed disc 72, in this embodiment, the driving toothed disc 72 is also a circular structure and has a through circular hole two in the middle, the outer diameter of the driving toothed disc 72 is smaller than the outer diameter of the chuck body 4, the driving toothed disc 72 and the chuck body 4 are coaxially disposed, the driving toothed disc 72 is rotatably mounted on a side of the chuck body 4 facing away from the jaw structure, and the driving cylinder 71 is also located on a side of the chuck body 4 facing away from the jaw structure.

Drive fixedly connected with afterbody engaging lug 10 on actuating cylinder 71's the body, afterbody engaging lug 10 middle part link up the setting and form the connecting hole, fixed connection has the afterbody connecting rod 11 for cylindric on the chuck body 4, the one end integrated into one piece that the chuck body 4 was kept away from to afterbody connecting rod 11 is equipped with afterbody extension rod 111, and afterbody extension rod 111 and the coaxial setting of afterbody connecting rod 11, the diameter of afterbody extension rod 111 is less than the diameter of afterbody connecting rod 11, the connecting hole on afterbody engaging lug 10 is passed in the cooperation of afterbody extension rod 111, after the one end of keeping away from afterbody connecting rod 11 at afterbody extension rod 111 has cup jointed afterbody hoop 12, in order to fixing the body that drives actuating cylinder 71, the body that drives actuating cylinder 71 simultaneously can rotate on afterbody extension rod 111.

Drive threaded connection and have head engaging lug 13 on the piston rod of actuating cylinder 71, head engaging lug 13 middle part also link up the setting and form another connecting hole, fixed connection is for cylindric head connecting rod 14 on the drive fluted disc 72, head connecting rod 14 keeps away from the one end integrated into one piece that drives actuating fluted disc 72 and is equipped with head extension rod 141, and head extension rod 141 and the coaxial setting of head connecting rod 14, the diameter of head extension rod 141 is less than the diameter of head connecting rod 14, the connecting hole on head engaging lug 13 is passed in the cooperation of head extension rod 141, later, head hoop 15 has been cup jointed to the one end of keeping away from head connecting rod 14 at head extension rod 141, in order to fix the piston rod that drives actuating cylinder 71, the piston rod that drives actuating cylinder 71 simultaneously can rotate on head extension rod 141.

Therefore, the driving cylinder 71 can push the driving fluted disc 72 to rotate back and forth on the chuck body 4 during operation, and the rotation of the driving fluted disc 72 provides the power required by the transmission of the primary transmission unit 8 and the secondary transmission unit 9, so as to drive the primary slider 2 and the secondary slider 3 to slide successively.

Referring to fig. 6 and 7, the primary transmission unit 8 includes a primary transmission gear roller 81, and an axis of the primary transmission gear roller 81 is parallel to an axis of the driving toothed disc 72. One side of chuck body 4 back to the jaw structure is seted up and is supplied the holding tank 42 that one-level transmission fluted roller 81 put into, and one-level transmission fluted roller 81 rotates and installs in holding tank 42. The holding groove 42 is located the inside one end of chuck body 4 and communicates with one-level spout 41 for one-level transmission fluted roller 81 extends to in one-level spout 41, and has one-level transmission tooth's socket 82 with one-level transmission fluted roller 81 engaged with on the lateral wall of one-level slider 2, and one-level transmission fluted roller 81 still meshes with drive fluted disc 72 mutually simultaneously.

When the driving cylinder 71 pushes the driving fluted disc 72 to rotate, the driving fluted disc 72 is meshed with the first-stage transmission fluted roller 81 to drive the first-stage transmission fluted roller 81 to rotate, and then the first-stage slider 2 is driven to slide on the chuck body 4 through the meshing of the first-stage transmission fluted roller 81 and the first-stage transmission tooth groove 82.

Referring to fig. 8, the secondary transmission unit 9 includes a secondary transmission toothed roller 91, and the axis of the secondary transmission toothed roller 91 is perpendicular to the axis of the primary transmission toothed roller 81. The primary slider 2 is provided with a through containing hole 22 for the secondary transmission toothed roller 91 to be put in, the secondary transmission toothed roller 91 is rotatably installed in the containing hole 22, and the secondary transmission toothed roller 91 can move along with the sliding of the primary slider 2.

One side of one-level slider 2 dorsad second grade slider 3 is provided with middle transmission piece 92, offers the hidden groove 43 that supplies middle transmission piece 92 cooperation to put into on the tank bottom of one-level spout 41, and middle transmission piece 92 passes through the fix with screw in hidden groove 43, and middle transmission piece 92 flushes mutually with the tank bottom of one-level spout 41. The intermediate drive block 92 has an intermediate drive groove 93 for engaging with the secondary drive sprocket 91, and the secondary slider 3 has a secondary drive groove 94 for engaging with the secondary drive sprocket 91.

When the first-stage sliding block 2 is driven to slide, the second-stage transmission toothed roller 91 moves along with the sliding of the first-stage sliding block 2, in the process, the second-stage transmission toothed roller 91 is meshed with the middle transmission toothed groove 93 on the middle transmission block 92, so that the second-stage transmission toothed roller 91 can be driven to rotate, and under the condition that the second-stage transmission toothed roller 91 rotates, the second-stage transmission toothed roller 91 is meshed with the second-stage transmission toothed groove 94 on the second-stage sliding block 3, so that the second-stage sliding block 3 can be driven to slide on the first-stage sliding block 2.

The implementation principle of the chuck with the jaw structure is as follows: the driving cylinder 71 pushes the driving fluted disc 72 to rotate in the running process, the primary driving fluted disc 81 can be driven to rotate by the meshing of the driving fluted disc 72 and the primary driving fluted roller 81, and the primary sliding block 2 is driven to slide on the chuck body 4 by the meshing of the primary driving fluted roller 81 and the primary driving fluted groove 82; drive second grade transmission fluted roller 91 and remove at the gliding in-process of one-level slider 2, because second grade transmission fluted roller 91 meshes with middle transmission tooth's socket 93 on the middle driving block 92, can order about second grade transmission fluted roller 91 and rotate, under second grade transmission fluted roller 91 pivoted condition, because second grade transmission fluted roller 91 meshes with second grade transmission tooth's socket 94 on the second grade slider 3, and then can order about second grade slider 3 and slide on one-level slider 2 to this realization drives the gliding purpose of one-level slider 2 and second grade slider 3.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a jack catch structure, includes activity jack catch (1), its characterized in that: the sliding mechanism is characterized by further comprising a slidable one-level sliding block (2) and a second-level sliding block (3) which is arranged on the one-level sliding block (2) in a sliding mode, the one-level sliding block (2) and the second-level sliding block (3) are identical in sliding direction, and the movable clamping jaws (1) are installed on the second-level sliding block (3).

2. The jaw structure of claim 1, wherein: the two-stage sliding groove (21) for the sliding of the two-stage sliding block (3) is formed in the one-stage sliding block (2), and the two sides of the two-stage sliding block (3) are provided with limiting blocks (5) on the one-stage sliding block (2).

3. The jaw structure of claim 1, wherein: the two-stage sliding block (3) is provided with a positioning groove (31), and the movable clamping jaw (1) is provided with a positioning block (6) which is clamped into the positioning groove (31) in a matching manner.

4. A chuck for applying the jaw structure of claim 1, wherein: including chuck body (4), the jack catch structure is followed the week side of chuck body (4) is provided with a plurality ofly, offer the confession on chuck body (4) one-level slider (2) gliding one-level spout (41).

5. The chuck as set forth in claim 4, wherein: the quantity of jack catch structure is the even number on the chuck body (4), and the jack catch structure that the quantity is the even number is followed the week side equipartition of chuck body (4) passes through central connecting straight line two jack catch structures at chuck body (4) center are established to a pair of, consequently total a plurality of to the jack catch structure, and a plurality of to the jack catch structure all not on the coplanar.

6. The chuck as set forth in claim 4, wherein: still include actuating mechanism, actuating mechanism installs on chuck body (4), actuating mechanism includes driving source (7), one-level transmission unit (8) and secondary transmission unit (9), and driving source (7) provide one-level transmission unit (8) and secondary transmission unit (9) driven power, and one-level transmission unit (8) are used for the drive one-level slider (2) slide, and secondary transmission unit (9) are used for the drive secondary slider (3) slide.

7. The chuck as set forth in claim 6, wherein: the driving source (7) comprises a driving cylinder (71) and a driving fluted disc (72), the driving fluted disc (72) rotates and is installed on the chuck body (4), one end of the driving cylinder (71) is hinged on the chuck body (4), and the other end of the driving cylinder (71) is hinged on the driving fluted disc (72).

8. The chuck as set forth in claim 7, wherein: a tail connecting lug (10) is fixedly connected to the body of the driving cylinder (71), a tail connecting rod (11) is arranged on the chuck body (4), a tail extension rod (111) penetrating through the tail connecting lug (10) is arranged at one end, far away from the chuck body (4), of the tail connecting rod (11), and a tail hoop (12) is sleeved at one end, penetrating through the tail connecting lug (10), of the tail extension rod (111);

threaded connection has head engaging lug (13) on the piston rod of drive actuating cylinder (71), be provided with head connecting rod (14) on drive fluted disc (72), the one end that drive fluted disc (72) was kept away from in head connecting rod (14) has head extension rod (141) of passing head engaging lug (13), head hoop (15) have been cup jointed to the one end that head extension rod (141) passed head engaging lug (13).

9. The chuck as set forth in claim 7, wherein: one-level drive unit (8) are including one-level transmission fluted roller (81), holding tank (42) that supply one-level transmission fluted roller (81) to put into have on chuck body (4), one-level transmission fluted roller (81) rotate to be installed in holding tank (42), the one end of one-level transmission fluted roller (81) with drive fluted disc (72) mesh mutually, have on the lateral wall of one-level slider (2) with the one-level transmission tooth's socket (82) of the other end meshing of one-level transmission fluted roller (81).

10. The chuck as set forth in claim 6, wherein: the secondary transmission unit (9) comprises a secondary transmission toothed roller (91), the primary slide block (2) is provided with an accommodating hole (22) for the secondary transmission toothed roller (91) to be placed in, and the secondary transmission toothed roller (91) is rotatably installed in the accommodating hole (22);

an intermediate transmission block (92) is arranged on one side, opposite to the second-stage slider (3), of the chuck body (4) on the first-stage slider (2), a hidden groove (43) for placing the intermediate transmission block (92) is formed in the chuck body (4), and the intermediate transmission block (92) is fixedly connected in the hidden groove (43);

the middle transmission block (92) is provided with a middle transmission tooth groove (93) meshed with one side of the secondary transmission tooth roller (91), and the secondary sliding block (3) is provided with a secondary transmission tooth groove (94) meshed with the other side of the secondary transmission tooth roller (91).