CN211679650U

CN211679650U - Positioning device of punch press

Info

Publication number: CN211679650U
Application number: CN201922325634.5U
Authority: CN
Inventors: 敖子建; 龚玉梅
Original assignee: Wuhan Hechuang Auto Parts Co ltd
Current assignee: Wuhan Hechuang Auto Parts Co ltd
Priority date: 2019-12-21
Filing date: 2019-12-21
Publication date: 2020-10-16
Anticipated expiration: 2029-12-21

Abstract

The utility model relates to a positioner of punch press, it is including installing two rectangular welts of terminal surface under punch press chassis up end and roof-rack, the both ends of welt length direction slide and are provided with the knot seat of two "L" types of relative settings, the vertical section of detaining the seat slides and sets up on the welt, be provided with on the welt and be used for driving two drive arrangement who detains seat looks/motion dorsad, the welt is close to one side of detaining the seat and has seted up a plurality of locating holes, the elasticity is provided with the locating pin in the locating hole, be provided with the adjustment mechanism who drives a plurality of locating pin synchronous outstanding locating holes on the welt. The utility model discloses a synchronous pop-up of a plurality of locating pins of adjustment mechanism drive and with the reservation hole plug-in connection on the punch press mould, can realize the quick accurate location of punch press mould, improved the efficiency of changing the punch press mould.

Description

Positioning device of punch press

Technical Field

The utility model belongs to the technical field of punch press auxiliary device's technique and specifically relates to a positioner of punch press is related to.

Background

The punching machine is a device for processing plates by punching of a punching machine die, can perform blanking, punching, forming, deep drawing, trimming, fine punching, shaping, riveting, extruding and the like, and is widely applied to various fields. In the production of sheet metal parts, the stamping process has the advantages of material and energy conservation, high efficiency, low technical requirement on operators and capability of making products which cannot be machined by applying various dies, so that the sheet metal parts are more and more widely used.

The chinese patent that current patent publication number is CN110216192A, a stamping device of quick die change is proposed, wherein the module is installed to the lower part of slider, the module is installed down at the top of workstation, go up the module including the last mould as the first mould clamping device of general subassembly and as the replacement subassembly, first mould clamping device is fixed in the lower part of slider for a long time, first mould clamping device is provided with location fast latch mechanism, the last mould clamping that the replacement used is in last location fast latch mechanism, the component structure of module is the same with the component structure of last module down. The invention can realize the quick replacement of the upper die and the lower die, and can finish the die assembly correction between the upper die and the lower die at the same time, the die replacement speed is high, and the production efficiency is improved.

The above prior art solutions have the following drawbacks: when the punch die is positioned and calibrated, only a plurality of limiting columns can be controlled independently, the limiting columns need to be calibrated one by one during positioning, the plurality of limiting columns are difficult to align to reserved holes on the punch die quickly, and the positioning efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a positioner of punch press, it has the advantage of quick location to prior art exists not enoughly.

The above object of the present invention can be achieved by the following technical solutions:

the utility model provides a positioner of punch press, is including installing two rectangular welts of terminal surface under punch press chassis up end and roof-rack, sliding at welt length direction's both ends is provided with the knot seat of "L" type of two relative settings, the vertical section of detaining the seat slides and sets up on the welt, be provided with on the welt and be used for driving two detain the seat in opposite directions/dorsad motion's drive arrangement, the welt is close to detain one side of seat and seted up a plurality of locating holes, the elasticity is provided with the locating pin in the locating hole, it is a plurality of to be provided with the drive on the welt the locating pin is outstanding in step the adjustment mechanism of locating hole.

Through adopting above-mentioned technical scheme, with the punch press mould through two knot seat locks back on the welt, need fix a position the calibration to the punch press mould, in order to ensure that the punch press mould realizes accurate punching press, can slide the punch press mould on the welt, make a plurality of locating holes on the reserved hole on the punch press mould align with the welt, rethread adjustment mechanism drive a plurality of locating pins pop out in step and with the reserved hole plug-in connection on the punch press mould, after changing the punch press mould, when the reserved hole on the punch press mould of equidimension all with a plurality of locating holes of welt fit, only need through during the reserved hole in the punch press mould is gone up in step respectively to a plurality of locating pins on two welts through adjustment mechanism, can realize the quick accurate location of punch press mould, the efficiency of the punch press change mould.

The present invention may be further configured in a preferred embodiment as: adjustment mechanism is including seting up just be located its length direction on the welt two hold the chamber between the locating hole, the locating hole is provided with four and adjacent line and is the rectangle, it is provided with two to hold the chamber, the welt in hold the chamber and be adjacent seted up the slide between the locating hole, the slide with hold the chamber with the locating hole all communicates, the slide internal slipping is provided with the push rod, the locating pin is kept away from detain the one end of seat in being close to one side of push rod is provided with the inclined plane, the inclined plane deviates from detain the seat, two it is provided with and is used for promoting four to hold the intracavity the push rod is towards being close to in step the adjusting part that the locating pin is close to.

Through adopting above-mentioned technical scheme, after a plurality of reservation holes in the punch press mould all aimed at with a plurality of locating holes on the welt, move towards the direction that deviates from corresponding chamber that holds through four push rods of adjusting part drive, the push rod supports tightly on the inclined plane of locating pin when sliding in the slide, when the push rod continues to march, the locating pin is promoted through the relative motion of its inclined plane and push rod and is shifted up and outstanding in the locating hole, thereby realize the synchro control of adjusting part to four locating pins, make when fixing a position the punch press mould more swift.

The present invention may be further configured in a preferred embodiment as: the adjusting component is connected including rotating the elliptical wheel that is in hold the intracavity, two coaxial rigid coupling has the rotation to be connected between the elliptical wheel the connecting rod in the welt, the push rod axis with the elliptical wheel axis is crossing and perpendicular, works as the elliptical wheel rotatory to its major axis with when the push rod collineation, the push rod is in under the pushing action of elliptical wheel towards being close to the direction removal of locating pin to through inclined plane top on the locating pin makes its salient in the locating hole.

By adopting the technical scheme, the long axes of the elliptic wheels are respectively collinear with the axes of the adjacent push rods by rotating the elliptic wheels, in the process, the peripheral wall of the cambered surface of the elliptic wheel is gradually contacted with the adjacent two push rods and pushes the two push rods to slide in the adjacent two slideways and abut against the inclined surfaces of the adjacent two positioning pins, when the long axes of the elliptic wheels are collinear with the push rods, the push rods abut against one end of the inclined surface farthest away from the buckle seat, and at the moment, the four positioning pins are synchronously ejected out of the positioning holes so as to realize the quick positioning of the punch press mold; when the punch press mould needs to be replaced, the short shafts of the two elliptic wheels and the adjacent push rod axes are collinear by rotating the elliptic wheels, the four positioning pins elastically arranged in the four positioning holes are rebounded to the positioning holes to synchronously remove the positioning of the opposite punch press mould, and the punch press mould can slide out of the lining plate at the moment, so that the convenient and fast disassembly of the punch press mould is realized.

The present invention may be further configured in a preferred embodiment as: the lateral wall of the lining plate is rotatably connected with a rotating shaft which is coaxially and fixedly connected with one of the elliptical wheels, and one end of the rotating shaft, which is far away from the elliptical wheel, is fixedly connected with a knob.

Through adopting above-mentioned technical scheme, rotate the knob, the rotatory elliptical wheel that drives the pivot and then drive its rigid coupling is rotatory when the knob is rotatory, drives another elliptical wheel synchronous revolution through the connecting rod when this elliptical wheel is rotatory, has realized the convenient control of adjustment mechanism to the locating pin.

The present invention may be further configured in a preferred embodiment as: an elastic part is elastically connected between the end part of the positioning pin close to the inclined plane and the bottom wall of the positioning hole, one end of the elastic part is fixedly connected with the positioning pin, and the other end of the elastic part is fixedly connected with the bottom wall of the positioning hole.

Through adopting above-mentioned technical scheme, the locating pin is outstanding behind the locating hole under the top push effect of push rod, and the elastic component is stretched and is produced deformation, and when the punch press mould was dismantled to needs, but the contrarotation elliptical wheel made elliptical wheel minor axis and push rod axis coincidence, the locating pin is in the locating hole of retraction under the effect of elastic component deformation power to promote the push rod to remove towards the direction that is close to the elliptical wheel in the slide, can slide the punch press mould on the welt this moment in order to realize the convenient of locate function and relieve.

The present invention may be further configured in a preferred embodiment as: and one end of the positioning pin, which is close to the buckle seat, is provided with a round angle.

Through adopting above-mentioned technical scheme, it is more smooth and easy when the locating pin stretches into the reservation hole of punch press mould, has reduced the excessive wearing and tearing of locating pin as far as possible.

The present invention may be further configured in a preferred embodiment as: the driving device comprises a plurality of fixedly connected T-shaped sliders, the T-shaped sliders are fixedly connected with the vertical sections of the buckle seats and close to one end of the lining plate, a plurality of T-shaped grooves matched with the sliders in a sliding mode are formed in the lining plate, the T-shaped grooves are formed in the length direction of the lining plate, and one of the T-shaped grooves is internally provided with a driving mechanism used for driving the two sliders to move in the opposite direction or in the opposite direction.

Through adopting above-mentioned technical scheme, detain the seat and set up on the welt through a plurality of sliders that slide in a plurality of T type grooves, especially be provided with on the welt of mould, detain the seat and can provide good carry ability for last mould, ensured the life of detaining the seat, when the not unidimensional mould of installation, the adaptation of detaining seat and punch press mould is realized to the motion of two sliders of accessible actuating mechanism drive in opposite directions/dorsad.

The present invention may be further configured in a preferred embodiment as: actuating mechanism is connected including rotating the double threaded rod that T type inslot and set up along its length direction, the pitch of double threaded rod both ends helicla flute is the same, spiral opposite direction, the double threaded rod both ends respectively with adjacent two slider threaded connection, the coaxial rigid coupling of bolt head threaded rod one end has the hand wheel.

Through adopting above-mentioned technical scheme, rotatory double threaded rod, double threaded rod drive two sliders of threaded connection with it when rotatory do the synchronous motion that is close to or keeps away from at double threaded rod both ends to drive two sliders and do in opposite directions or back to the motion in T type inslot, and then drive two and detain the seat and do opposite directions or back to the motion, realized drive arrangement and detained the convenient adjustment of seat to two.

To sum up, the utility model discloses a following at least one useful technological effect:

1. after the die is replaced, when the reserved holes in the punch dies with different sizes are matched with the positioning holes in the lining plates, the positioning pins on the two lining plates are synchronously jacked into the reserved holes in the punch dies through the adjusting mechanisms, so that the punch dies can be quickly and accurately positioned, and the die replacement efficiency is improved;

2. when the elliptical wheels rotate to the state that the long axes of the elliptical wheels are collinear with the push rod, the push rod is pushed by the outer peripheral walls of the elliptical wheels to be tightly abutted to one end, farthest from the buckling seat, of the inclined plane, so that the positioning pins are ejected out of the positioning holes, and the four positioning pins are ejected out of the positioning holes synchronously under the driving of the two elliptical wheels which rotate synchronously, and the synchronous control of the adjusting mechanism on the four positioning pins is realized;

3. the locating pin is outstanding behind the locating hole under the top push effect of push rod, and the elastic component is tensile to produce deformation, and when the punch press mould was dismantled to needs, but the contrarotation elliptical wheel made elliptical wheel minor axis and push rod axis coincidence, the locating pin is in the locating hole of retraction under the effect of elastic component deformation to promote the push rod to remove towards the direction that is close to the elliptical wheel in the slide, can slide the punch press mould on the welt this moment in order to realize the convenient of locate function and relieve.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic sectional view taken along line a-a of fig. 1.

Fig. 3 is a schematic sectional view taken along line B-B in fig. 1.

In the figure, 1, a lining plate; 2. a buckle seat; 3. positioning holes; 4. positioning pins; 5. an accommodating chamber; 6. a slideway; 7. a push rod; 8. a bevel; 9. an elliptical wheel; 10. a rotating shaft; 11. a knob; 12. an elastic member; 13. a slider; 14. a T-shaped groove; 15. a double-headed threaded rod; 16. a hand wheel; 17. a connecting rod.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the positioning device for a punch press disclosed by the present invention comprises two rectangular lining plates 1 mounted on the upper end surface of the bottom frame and the lower end surface of the top frame of the punch press, two ends of the lining plate 1 in the length direction are slidably provided with two L-shaped buckling seats 2 which are oppositely arranged, the vertical section of each buckling seat 2 is slidably arranged on the lining plate 1, and the lining plate 1 is provided with a driving device for driving the two buckling seats 2 to move in the opposite/reverse directions; one side of welt 1 near detaining seat 2 has seted up a plurality of locating holes 3, and locating hole 3 is provided with four and adjacent line and is the rectangle, and the elasticity is provided with locating pin 4 in locating hole 3, and locating hole 3 and locating pin 4 are square in this embodiment, are provided with the adjustment mechanism that drives a plurality of locating pins 4 synchronous salient locating hole 3 on the welt 1.

Referring to fig. 1 and 2, the adjusting mechanism comprises an accommodating cavity 5 which is arranged on the lining plate 1 and is located between two positioning holes 3 in the length direction of the lining plate, four adjacent connecting lines are arranged on the positioning holes 3 and are rectangular, two accommodating cavities 5 are correspondingly arranged, a slide rail 6 is arranged between the accommodating cavity 5 and the adjacent positioning holes 3 on the lining plate 1, the slide rail 6 is communicated with the accommodating cavity 5 and the positioning holes 3, a push rod 7 is arranged in the slide rail 6 in a sliding manner, an inclined surface 8 is arranged on one side, close to the push rod 7, of one end, far away from the buckle seat 2, of the positioning pin 4, the inclined surface 8 is arranged away from the buckle seat 2, and an adjusting component for pushing the four push rods 7 to approach the positioning; the adjusting assembly comprises elliptical wheels 9 which are rotatably connected in the accommodating cavity 5, a connecting rod 17 which is rotatably connected in the lining plate 1 is coaxially and fixedly connected between the two elliptical wheels 9, the axis of the push rod 7 is intersected and perpendicular to the axis of the adjacent elliptical wheel 9, when the elliptical wheel 9 rotates to the state that the long axis of the elliptical wheel is collinear with the push rod 7, the push rod 7 moves towards the direction close to the positioning pin 4 under the pushing action of the elliptical wheel 9, and the positioning pin 4 is pushed to protrude out of the positioning hole 3 through the inclined plane 8 on the positioning pin 4.

After a punch die is buckled on a lining plate 1 through two buckling seats 2, the punch die needs to be positioned and calibrated to ensure that the punch die realizes accurate punching, the punch die can be slid on the lining plate 1 to enable reserved holes on the punch die to be aligned with a plurality of positioning holes 3 on the lining plate 1, then one elliptical wheel 9 is rotated to enable the other elliptical wheel 9 to be driven by a connecting rod 17 to rotate until the long axes of the two elliptical wheels 9 are respectively collinear with the axes of the adjacent push rods 7, in the process, the outer circumferential wall of the cambered surface of the elliptical wheel 9 is gradually contacted with the adjacent two push rods 7 and pushes the two push rods 7 to slide in the adjacent two slide ways 6 and abut against the inclined surfaces 8 of the adjacent two positioning pins 4, when the long axes of the elliptical wheels 9 are collinear with the push rods 7, the push rods 7 abut against one end, farthest from the buckling seats 2, of the four positioning pins 4 are synchronously ejected out of the positioning holes 3, so as to realize the rapid positioning of the punch die.

When the punching machine die needs to be replaced, the elliptical wheels 9 are rotated to enable the short shafts of the two elliptical wheels 9 to be collinear with the axes of the adjacent push rods 7, the four positioning pins 4 which are elastically arranged in the four positioning holes 3 rebound into the positioning holes 3 to synchronously release the positioning of the punching machine die, and the punching machine die can slide out of the lining plate 1 at the moment, so that the convenient disassembly of the punching machine die is realized; after the punch press mould is replaced, when the reserved holes in the punch press mould with different sizes are matched with the positioning holes 3 in the lining plate 1, the four positioning pins 4 on the two lining plates 1 are synchronously jacked into the reserved holes in the punch press mould through the two synchronously rotating elliptical wheels 9, so that the quick and accurate positioning of the punch press mould can be realized, and the efficiency of replacing the punch press mould is improved.

Referring to fig. 1 and 2, a rotating shaft 10 coaxially and fixedly connected with one of the elliptical wheels 9 is rotatably connected to the side wall of the lining plate 1, a knob 11 is fixedly connected to one end, far away from the elliptical wheel 9, of the rotating shaft 10, an elastic part 12 is elastically connected between the end portion, close to the inclined plane 8, of the positioning pin 4 and the bottom wall of the positioning hole 3, one end of the elastic part 12 is fixedly connected with the positioning pin 4, the other end of the elastic part is fixedly connected with the bottom wall of the positioning hole 3, and a round.

The knob 11 is rotated, the rotating shaft 10 is driven to rotate when the knob 11 rotates so as to drive the elliptical wheel 9 fixedly connected with the rotating shaft to rotate, the other elliptical wheel 9 is driven to synchronously rotate through the connecting rod 17 when the elliptical wheel 9 rotates, the positioning pin 4 is conveniently and smoothly controlled by the adjusting mechanism, the positioning pin 4 is more smoothly extended into a reserved hole of a punch die due to the arrangement of the round corners, and excessive abrasion of the positioning pin 4 is reduced as much as possible; after the positioning pin 4 protrudes out of the positioning hole 3 under the pushing action of the push rod 7, the elastic part 12 is stretched to generate deformation, when the punch press mold needs to be disassembled, the elliptical wheel 9 can be rotated reversely to enable the short axis of the elliptical wheel 9 to coincide with the axis of the push rod 7, the positioning pin 4 retracts into the positioning hole 3 under the action of the deformation force of the elastic part 12, the push rod 7 is pushed to move in the slide 6 towards the direction close to the elliptical wheel 9, and the punch press mold can be slid on the lining plate 1 at the moment to achieve convenient and fast release of the positioning function.

Referring to fig. 1 and 3, the driving device comprises a plurality of T-shaped sliding blocks 13 fixedly connected to one end of the vertical section of the buckle base 2 close to the lining plate 1, the three sliding blocks 13 are preferably arranged and distributed at equal intervals along the width direction of the lining plate 1, the lining plate 1 is provided with a plurality of T-shaped grooves 14 in sliding fit with the sliding blocks 13, the T-shaped grooves 14 are arranged along the length direction of the lining plate 1, and a driving mechanism for driving the two sliding blocks 13 to move in the opposite direction/back direction is arranged in the T-shaped groove 14 in the middle of the width direction of the lining plate 1; the driving mechanism comprises a double-threaded rod 15 which is rotatably connected in a T-shaped groove 14 in the middle of the width direction of the lining plate 1 and is arranged along the length direction of the lining plate, the thread pitches of spiral grooves at two ends of the double-threaded rod 15 are the same, the spiral directions are opposite, two ends of the double-threaded rod 15 are respectively in threaded connection with two adjacent sliding blocks 13, and a hand wheel 16 is coaxially and fixedly connected to one end of a bolt head threaded rod.

When a punching die is installed, the two hand wheels 16 are respectively rotated, the hand wheels 16 drive the double-threaded rod 15 to rotate when rotating, the double-threaded rod 15 drives the two sliders 13 in threaded connection with the double-threaded rod to synchronously move close to or away from two ends of the double-threaded rod 15 when rotating, so that the two sliders 13 are driven to move in the T-shaped groove 14 in opposite directions or in opposite directions, and then the two buckling seats 2 are driven to move in opposite directions or in opposite directions until the two buckling seats 2 are adjusted to a proper distance, so that the punching die can be buckled on the lining plate 1 by the two buckling seats 2, and then the punching die is pushed on the lining plate 1 to be positioned, and the convenient installation of the punching die is realized; the buckle seat 2 is arranged on the lining plate 1 through a plurality of sliding blocks 13 sliding in a plurality of T-shaped grooves 14, so that the buckle seat 2 arranged above can provide good hanging capacity for the upper die, the service life of the buckle seat 2 is ensured, and the convenience in installing a punch die is improved; when the die needs to be replaced, the punch die slides between the two buckling seats 2 until the punch die is disassembled, so that the die disassembling efficiency is higher, and the effect that the punch die is quickly replaced is realized.

The implementation principle of the embodiment is as follows:

after the punch die is buckled on the lining plate 1 through the two buckling seats 2, the punch die needs to be positioned and calibrated to ensure that the punch die realizes accurate punching, the punch die can slide on the lining plate 1 to align the reserved holes on the punch die with the positioning holes 3 on the lining plate 1, then the long axes of one elliptical wheel 9 and two elliptical wheels 9 are respectively in line with the axes of the adjacent push rods 7 by rotating the elliptical wheels 9, in the process, the arc-shaped peripheral wall of the elliptical wheel 9 gradually contacts with the two adjacent push rods 7 and pushes the two push rods 7 to slide in the two adjacent slide ways 6 and abut against the inclined surfaces 8 of the two adjacent positioning pins 4, when the long axis of the elliptical wheel 9 is collinear with the push rod 7, the push rod 7 is tightly propped against one end, farthest from the buckling seat 2, of the inclined surface 8, and at the moment, the four positioning pins 4 are synchronously ejected out of the positioning holes 3, so that the die of the punching machine is quickly positioned; after the punch press die is replaced, when the reserved holes in the punch press die with different sizes are matched with the positioning holes 3 in the lining plates 1, the reserved holes in the punch press die can be synchronously jacked into the positioning holes in the punch press die respectively by only using the adjusting mechanisms to enable the punch press die to be quickly and accurately positioned, and the efficiency of replacing the punch press die is improved.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a positioner of punch press which characterized in that: including installing two rectangular welts (1) of terminal surface under punch press chassis up end and roof-rack, welt (1) length direction's both ends slide and are provided with knot seat (2) of two relative "L" types that set up, the vertical section of detaining seat (2) slides and sets up on welt (1), be provided with on welt (1) and be used for driving two detain seat (2) in opposite directions/dorsad motion's drive arrangement, welt (1) are close to detain one side of seat (2) and seted up a plurality of locating hole (3), elasticity is provided with locating pin (4) in locating hole (3), it is a plurality of to be provided with the drive on welt (1) locating pin (4) are outstanding in step the adjustment mechanism of locating hole (3).

2. The positioning device of a punching machine according to claim 1, wherein: the adjusting mechanism comprises an accommodating cavity (5) which is arranged on the lining plate (1) and is positioned between the two positioning holes (3) in the length direction, the positioning holes (3) are provided with four adjacent connecting lines which are rectangular, the accommodating cavities (5) are provided with two connecting lines, a slide way (6) is arranged between the accommodating cavity (5) and the adjacent positioning hole (3) of the lining plate (1), the slide way (6) is communicated with the containing cavity (5) and the positioning hole (3), a push rod (7) is arranged in the slide way (6) in a sliding way, an inclined surface (8) is arranged at one side of one end of the positioning pin (4) far away from the buckle seat (2) and close to the push rod (7), the inclined plane (8) deviates from the buckle seat (2), and two accommodating cavities (5) are internally provided with adjusting components for pushing four push rods (7) to approach the positioning pins (4) synchronously.

3. The positioning device of a punching machine according to claim 2, wherein: the adjusting part is connected including rotating elliptical wheel (9) in holding chamber (5), two coaxial rigid coupling has the rotation to be connected between elliptical wheel (9) connecting rod (17) in welt (1), push rod (7) axis with elliptical wheel (9) axis is crossing and perpendicular, works as elliptical wheel (9) are rotatory to its major axis with during push rod (7) collineation, push rod (7) are in under the impetus of elliptical wheel (9) towards being close to the direction of locating pin (4) is removed, and passes through inclined plane (8) top on locating pin (4) push locating pin (4) make its outstanding in locating hole (3).

4. The positioning device of a punching machine according to claim 3, wherein: the rotary plate is characterized in that a rotating shaft (10) which is fixedly connected with the elliptic wheel (9) in a coaxial mode is rotatably connected to the side wall of the lining plate (1), and a knob (11) is fixedly connected to one end, far away from the elliptic wheel (9), of the rotating shaft (10).

5. The positioning device of a punching machine according to claim 4, wherein: the end part of the positioning pin (4) close to the inclined plane (8) is elastically connected with the bottom wall of the positioning hole (3) through an elastic part (12), one end of the elastic part (12) is fixedly connected with the positioning pin (4), and the other end of the elastic part is fixedly connected with the bottom wall of the positioning hole (3).

6. The positioning device of a punching machine according to claim 5, wherein: and one end of the positioning pin (4) close to the buckle seat (2) is provided with a round angle.

7. The positioning device of a punching machine according to claim 6, wherein: drive arrangement includes that a plurality of rigid couplings are in detain the vertical section of seat (2) and be close to slider (13) of "T" style of calligraphy of welt (1) one end, seted up on welt (1) a plurality of with T type groove (14) of slider (13) adaptation that slides, T type groove (14) are followed welt (1) length direction sets up, one of them be provided with in T type groove (14) and be used for driving two slider (13) the actuating mechanism of motion dorsad in opposite directions.

8. The positioning device of a punching machine according to claim 7, wherein: actuating mechanism is connected including rotating double threaded rod (15) that just follows its length direction setting in T type groove (14), the pitch of double threaded rod (15) both ends helicla flute is the same, spiral opposite direction, double threaded rod (15) both ends respectively with adjacent two slider (13) threaded connection, the coaxial rigid coupling of double threaded rod (15) one end has hand wheel (16).