CN113399506A

CN113399506A - Bending die for plate-shaped part

Info

Publication number: CN113399506A
Application number: CN202110669151.6A
Authority: CN
Inventors: 陈玲玲
Original assignee: Xiamen Xuanyin Trade Co ltd
Current assignee: Xiamen Xuanyin Trade Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2021-09-17

Abstract

The invention discloses a plate bending die which comprises a main box body, wherein rotating seat box bodies symmetrically arranged front and back are fixed on the front and back end surfaces of the main box body, a die switching mechanism is arranged between the rotating seat box bodies on the front and back sides, and a plate positioning mechanism is arranged in the main box body; the invention can turn the upper die and the lower die by utilizing the die switching mechanism, so that the bending direction of the plate can be changed very conveniently when the plate is bent, the potential safety hazard existing in the process of overturning the plate is avoided, the bending efficiency is also improved, and meanwhile, the plate positioning mechanism which can automatically stretch along with the overturning of the die can recover the initial position after the overturning of the die is completed, so that the positioning accuracy of the plate is ensured, and the bending precision is improved.

Description

Bending die for plate-shaped part

Technical Field

The invention relates to the technical field of bending of plate-type parts, in particular to a bending die for a plate-type part.

Background

The bending of the plate refers to a process of obtaining a required shape by deforming a metal plate under the pressure of an upper die or a lower die of a bending machine, the lower die of the conventional bending machine is generally fixed, the upper die moves downwards to be attached to the lower die for bending, so that the plate is generally bent upwards when being bent, and the large plate can be taken down from the bending machine for overturning and then bending operation if the bending direction needs to be changed when the large plate is bent, so that the bending efficiency is greatly reduced, and meanwhile, safety accidents easily occur in the overturning process of the large plate.

Disclosure of Invention

The invention aims to provide a plate bending die for overcoming the defects in the prior art.

The plate bending die comprises a main box body, wherein rotating seat box bodies which are symmetrically arranged in the front and back are fixed on the front and back end surfaces of the main box body, a die switching mechanism is arranged between the rotating seat box bodies on the front and back sides, and a plate positioning mechanism is arranged in the main box body;

the plate positioning mechanism comprises a positioning sliding block arranged in the main box body, a limiting mechanism is arranged in the positioning sliding block, and the plate positioning mechanism is used for positioning when a plate is bent;

the limiting mechanism comprises a ratchet wheel, a magnetic pawl is arranged on the lower side of the ratchet wheel, and the limiting mechanism is used for limiting the plate positioning mechanism;

the mould shifter comprises a mould seat with an upper mirror image and a lower mirror image, an upper mould and a lower mould fixing seat are arranged in the mould seat, and the mould shifter is used for converting moulds.

According to the technical scheme, a positioning slider cavity with a right opening is arranged in the main box body, a bevel gear transmission cavity is arranged on the left side of the positioning slider cavity, a bidirectional screw rod which is in rotary fit with the left end wall of the positioning slider cavity and extends rightwards into the positioning slider cavity and extends leftwards into the bevel gear transmission cavity is arranged in the positioning slider cavity, a driven bevel gear is fixed at the tail end of the left side of the bidirectional screw rod, a transmission belt cavity which is located at the rear side of the bevel gear transmission cavity is arranged in the rotating seat box body, a driving bevel gear shaft which is in rotary fit with the front end wall of the transmission belt cavity and extends forwards into the bevel gear transmission cavity and extends backwards into the transmission belt cavity is arranged in the transmission belt cavity, and a driving bevel gear which is meshed with the driven bevel gear is fixed at the tail end of the front side of the driving bevel gear shaft.

In a further technical scheme, a die holder rotating block is rotationally matched in the rotating seat box body, an annular rack which is annularly arranged by taking the rotating seat box body as a center is fixed on the outer circular surface of the rotating seat box body, a transmission straight gear cavity is arranged on the left side of the annular rack, a transmission straight gear shaft which extends inwards into the transmission straight gear cavity is rotationally matched with the outer end wall of the transmission straight gear cavity, the inboard end of transmission straight-tooth gear axle be fixed with annular rack toothing's transmission straight-tooth gear, the rear side the transmission straight-tooth gear axle extends to behind the axial drive belt intracavity, the rear side transmission straight-tooth gear axle rear side end with power fit has the drive belt between the initiative bevel gear axle, the front side transmission straight-tooth gear chamber front side be equipped with the front side rotate seat box body fixed connection's motor, the front side transmission straight-tooth gear axle extend to before the axial with motor rear end face fixed connection.

In a further technical scheme, the plate positioning mechanism also comprises a positioning plate rack arranged in the positioning sliding block, a positioning plate is fixed on the right end face of the positioning plate rack, a rack sliding cavity with a rightward opening is arranged in the positioning sliding block, a pair of sliding pairs is formed between the positioning plate rack and the rack sliding cavity, a limiting gear cavity is communicated with the upper side of the rack sliding cavity, the rear end wall of the limit gear cavity is rotationally matched with a limit gear shaft which extends forwards into the limit gear cavity, a limit gear meshed with the upper end surface of the positioning plate rack is fixed at the tail end of the front side of the limit gear shaft, a bidirectional screw rod cavity with a backward opening is arranged in the positioning slide block, a nut is fixed in the inner wall of the bidirectional screw rod cavity, the bidirectional screw rod extends rightwards into the bidirectional screw rod cavity and is in threaded fit connection with the nut, and a reset torsion spring is fixed between the front end surface of the limiting gear shaft and the front end wall of the limiting gear cavity.

According to the technical scheme, the limiting mechanism further comprises a pawl electromagnet arranged on the lower side of the magnetic pawl, a ratchet cavity is formed in the rear side of the limiting gear cavity, a pawl sliding cavity is formed in the lower side of the ratchet cavity in a communicating mode, the limiting gear axially extends into the ratchet cavity, a ratchet is fixed at the tail end of the rear side of the ratchet cavity, a pair of sliding pairs are formed between the magnetic pawl and the pawl sliding cavity, the pawl electromagnet is fixed on the lower end wall of the pawl sliding cavity, and a pawl spring is fixed between the magnetic pawl and the pawl electromagnet.

According to a further technical scheme, ratchets are arranged on the outer circular surface of the ratchet wheel, and the magnetic pawl can be abutted to the ratchet wheel.

Further technical scheme, the mould shifter still including set up in go up the mould electro-magnet in the mould outside and set up in the lower mould electro-magnet in the lower mould fixing base outside, all be fixed with two tight piece fixing bases of clamp that the mirror set up around on the terminal surface about the lower mould fixing base, it has the tight piece of lower mould clamp to press from both sides tight piece in the interior screw-thread fit of piece fixing base, the mould base rear end face is fixed in the rear side rotate on the base box front end face, the front end face is fixed in the front side rotate on the base box rear end face, the upside be equipped with the last mould sliding chamber that the opening is decurrent in the mould base, go up the mould with it is vice to go up to form a pair of slip between the mould sliding chamber, be fixed with on the mould sliding chamber inner wall and be located go up the last mould stopper in the mould outside, it is fixed in to go up the mould electro-magnet on the mould sliding chamber diapire, it is fixed that the outside is fixed to extend through to go up the side end face go up the mould stopper to with go up the electro-magnet medial surface And an upper die return spring fixedly connected with the upper die.

According to the technical scheme, a lower die sliding cavity with an upward opening is formed in the die seat, a pair of sliding pairs is formed between the lower die fixing seat and the lower die sliding cavity, a lower die limiting block located on the outer side of the lower die fixing seat is fixed on the inner wall of the lower die sliding cavity, and a lower die reset spring which penetrates through the lower die limiting block to be fixedly connected with the inner side end face of the lower die electromagnet is fixed on the outer end face of the lower die fixing seat in an outward extending mode.

The invention has the beneficial effects that: the invention can turn the upper die and the lower die by utilizing the die switching mechanism, so that the bending direction of the plate can be changed very conveniently when the plate is bent, the potential safety hazard existing in the process of overturning the plate is avoided, the bending efficiency is also improved, and meanwhile, the plate positioning mechanism which can automatically stretch along with the overturning of the die can recover the initial position after the overturning of the die is completed, so that the positioning accuracy of the plate is ensured, and the bending precision is improved.

Drawings

FIG. 1 is a schematic external view of a bending die for a plate-shaped member according to the present invention;

FIG. 2 is a schematic view of the internal structure of a plate bending die according to the present invention;

FIG. 3 is a schematic cross-sectional view of the structure in the direction A-A of FIG. 2 according to the present invention;

FIG. 4 is an enlarged partial view of the structure of FIG. 2 at B in accordance with the present invention;

FIG. 5 is an enlarged view of a portion of the structure of FIG. 2 at C in accordance with the present invention;

FIG. 6 is an enlarged partial view of the structure of FIG. 2 at D in accordance with the present invention;

FIG. 7 is an enlarged view of a portion of the structure of FIG. 3 according to the present invention;

FIG. 8 is a schematic sectional view of the structure in the direction F-F in FIG. 4 according to the present invention.

Detailed Description

For purposes of making the objects and advantages of the present invention more apparent, the following detailed description of the invention, taken in conjunction with the examples, should be understood that the following text is only intended to describe one plate bending die or several specific embodiments of the invention, and not to strictly limit the scope of the invention as specifically claimed, as used herein, the terms upper, lower, left and right are not limited to their strict geometric definitions, but rather include tolerances for machining or human error rationality and inconsistency, the specific features of which are set forth in detail below:

referring to fig. 1 to 8, a plate bending die according to an embodiment of the present invention includes a main box 10, wherein front and rear end surfaces of the main box 10 are respectively fixed with a rotating seat box 20 symmetrically arranged in front and rear, a die switching mechanism is arranged between the front and rear rotating seat boxes 20, and a plate positioning mechanism is arranged in the main box 10;

the plate positioning mechanism comprises a positioning slide block 40 arranged in the main box body 10, a limiting mechanism is arranged in the positioning slide block 40, and the plate positioning mechanism is used for positioning when a plate is bent;

the limiting mechanism comprises a ratchet wheel 70, a magnetic pawl 76 is arranged on the lower side of the ratchet wheel 70, and the limiting mechanism is used for limiting the plate positioning mechanism;

the mould switching mechanism comprises a mould base 60 arranged in an upper mirror image and a lower mirror image, an upper mould 61 is arranged in the mould base 60 on the upper side, a lower mould fixing base 64 is arranged in the mould base 60 on the lower side, and the mould switching mechanism is used for switching moulds.

Illustratively, a positioning slider cavity 11 with a right opening is formed in the main case 10, a bevel gear transmission cavity 12 is formed in the left side of the positioning slider cavity 11, a bidirectional screw 33 which extends rightwards into the positioning slider cavity 11 and leftwards into the bevel gear transmission cavity 12 is rotationally fitted in the left end wall of the positioning slider cavity 11, a driven bevel gear 34 is fixed at the tail end of the left side of the bidirectional screw 33, a transmission belt cavity 311 which is located at the rear side of the bevel gear transmission cavity 12 is formed in the rotating base case 20 at the rear side, a drive bevel gear shaft 31 which extends forwards into the bevel gear transmission cavity 12 and backwards into the transmission belt cavity 311 is rotationally fitted in the front end wall of the transmission belt cavity 311, and a drive bevel gear 35 which is meshed with the driven bevel gear 34 is fixed at the tail end of the front side of the drive bevel gear shaft 31.

Illustratively, a mold base turning block 21 is rotationally fitted in the rotary base box 20, an annular rack 30 annularly disposed around the rotary base box 20 is fixed on an outer circumferential surface of the rotary base box 20, a transmission spur gear cavity 38 is disposed on a left side of the annular rack 30, a transmission spur gear shaft 39 inwardly extending into the transmission spur gear cavity 38 is rotationally fitted in an outer end wall of the transmission spur gear cavity 38, a transmission spur gear 37 engaged with the annular rack 30 is fixed at an inner end of the transmission spur gear shaft 39, the transmission spur gear shaft 39 at a rear side extends backwards into the transmission belt cavity 311, a transmission belt 310 is dynamically fitted between a rear end of the transmission spur gear shaft 39 at the rear side and the driving bevel gear shaft 31, and a motor 50 fixedly connected with the rotary base box 20 at a front side is disposed at a front side of the transmission spur gear cavity 38, the front side transmission straight gear shaft 39 extends forwards to be fixedly connected with the rear end face of the motor 50.

Exemplarily, the plate positioning mechanism further comprises a positioning plate rack 41 arranged in the positioning slider 40, a positioning plate 42 is fixed on the right end face of the positioning plate rack 41, a rack sliding cavity 43 with a rightward opening is arranged in the positioning slider 40, a pair of sliding pairs is formed between the positioning plate rack 41 and the rack sliding cavity 43, a limiting gear cavity 44 is communicated with the upper side of the rack sliding cavity 43, a limiting gear shaft 46 which extends forwards into the limiting gear cavity 44 is in rotating fit with the rear end wall of the limiting gear cavity 44, a limiting gear 45 which is meshed with the upper end face of the positioning plate rack 41 is fixed at the tail end of the front side of the limiting gear shaft 46, a backward-opening bidirectional screw rod cavity 47 is arranged in the positioning slider 40, a nut 48 is fixed in the inner wall of the bidirectional screw rod cavity 47, the bidirectional screw rod 33 extends rightwards into the bidirectional screw rod cavity 47 and is in threaded fit with the nut 48, a reset torsion spring 72 is fixed between the front end surface of the limit gear shaft 46 and the front end wall of the limit gear cavity 44.

Illustratively, the left end of the strongback rack 41 has no tooth shape, so that when the strongback rack 41 moves to the right and the left end abuts against the limit gear 45, the strongback rack 41 cannot move to the right.

Illustratively, the limiting mechanism further comprises a pawl electromagnet 74 arranged on the lower side of the magnetic pawl 76, a ratchet cavity 71 is arranged on the rear side of the limiting gear cavity 44, a pawl sliding cavity 73 is arranged on the lower side of the ratchet cavity 71 in a communicating manner, the limiting gear shaft 46 extends backwards into the ratchet cavity 71, a ratchet 70 is fixed at the rear end of the ratchet cavity 71, a pair of sliding pairs is formed between the magnetic pawl 76 and the pawl sliding cavity 73, the pawl electromagnet 74 is fixed on the lower end wall of the pawl sliding cavity 73, and a pawl spring 75 is fixed between the magnetic pawl 76 and the pawl electromagnet 74.

Illustratively, the ratchet wheel 70 has ratchet teeth on its outer circumferential surface, and the magnetic pawl 76 can abut against the ratchet wheel 70.

Illustratively, the mold switching mechanism further comprises an upper mold electromagnet 610 arranged outside the upper mold 61 and a lower mold electromagnet 67 arranged outside the lower mold fixing seat 64, wherein two clamping block fixing seats 63 arranged in a front-back mirror image manner are fixed on both left and right end surfaces of the lower mold fixing seat 64, a lower mold clamping block 62 is in threaded fit with the clamping block fixing seat 63, the rear end surface of the mold seat 60 is fixed on the front end surface of the rotary seat box 20, the front end surface of the mold seat 60 is fixed on the rear end surface of the rotary seat box 20, an upper mold sliding cavity 611 with a downward opening is arranged in the upper mold seat 60, a pair of sliding pairs is formed between the upper mold 61 and the upper mold sliding cavity 611, an upper mold limiting block 65 positioned outside the upper mold 61 is fixed on the inner wall of the upper mold sliding cavity 611, and the upper mold electromagnet 610 is fixed on the bottom wall of the upper mold sliding cavity 611, an upper die return spring 612 which extends outwards and penetrates through the upper die limiting block 65 to be fixedly connected with the inner side end face of the upper die electromagnet 610 is fixed on the outer side end face of the upper die 61.

Exemplarily, a lower die sliding cavity 69 with an upward opening is formed in the die holder 60 on the lower side, a pair of sliding pairs is formed between the lower die fixing seat 64 and the lower die sliding cavity 69, a lower die limiting block 66 located on the outer side of the lower die fixing seat 64 is fixed on the inner wall of the lower die sliding cavity 69, and a lower die return spring 68 extending through the lower die limiting block 66 to be fixedly connected with the end surface of the inner side of the lower die electromagnet 67 is fixed on the end surface of the outer side of the lower die fixing seat 64.

In an initial state, the upper die 61 is located on the upper side of the lower die fixing seat 64, the upper die electromagnet 610 and the lower die electromagnet 67 are in a power-off state, the bevel gear transmission cavity 12 and the lower die reset spring 68 are in a relaxed state, the lower die fixing seat 64 is attached to the upper end face of the lower die limiting block 66, the upper die 61 is attached to the lower end face of the upper die limiting block 65, the pawl electromagnet 74 is in a power-off state, the pawl spring 75 is in a compressed state, the magnetic pawl 76 is abutted to the ratchet wheel 70, the positioning plate rack 41 extends out of the rack sliding cavity 43, and the limiting gear 45 is abutted to the tail end of the left side of the positioning plate rack 41.

The lower die of the bending machine is placed on the upper end face of the lower die fixing seat 64, the V-shaped groove of the lower die is adjusted to be aligned with the upper die, and the lower die clamping block 62 is rotated, so that the lower die clamping block 62 moves inwards to clamp the lower die.

Place panel on the lower mould, panel left side edge butt in locating plate 42 right-hand member face, promote panel to last mould 61 alignment panel bending position leftwards, locating plate 42 moves leftwards under panel promotion in this process to drive locating plate rack 41 and move leftwards, and then make limit gear 45 rotate, thereby drive limit gear shaft 46 and rotate, thereby make reset torsion spring 72 twist reverse and hold power, limit gear shaft 46 rotates simultaneously and drives ratchet 70 and rotate, because magnetism pawl 76 and ratchet 70 butt, make ratchet 70 unable reversal, and then make reset torsion spring 72 keep holding power state.

At this time, the positioning of the plate is completed, and the positioning plate rack 41 keeps the current position.

At this time, the upper die electromagnet 610 is started, so that the upper die electromagnet 610 electrically repels the upper die 61, the upper die 61 overcomes the pulling force of the upper die return spring 612 and moves downwards to touch the upper surface of the plate, the upper die 61 continues to move downwards, and the plate is bent upwards under the action of the V-shaped groove of the lower die.

In the process, due to the blocking of the lower die limiting block 66, the lower die fixing seat 64 can keep still when the plate is bent, so that the bending effect is ensured.

After the plate reaches the bending angle, the upper die electromagnet 610 is closed, and the upper die 61 moves upwards to the initial position under the action of the pulling force of the upper die return spring 612, so that the operation is completed at one time.

If the bending direction of the plate needs to be changed, the plate is taken down, the motor 50 is started, the motor 50 drives the front-side transmission straight gear shaft 39 to rotate, the front-side transmission straight gear 37 rotates, the front-side annular rack 30 rotates, the front-side mold base rotating block 21 rotates, the mold base 60 rotates, the rear-side mold base rotating block 21 rotates together, the rear-side annular rack 30 rotates, the rear-side transmission straight gear 37 rotates, the rear-side transmission straight gear shaft 39 rotates, the driving bevel gear shaft 31 rotates through the transmission belt 310, the driving bevel gear 35 rotates, the driven bevel gear 34 rotates, the bidirectional screw rod 33 rotates, the nut 48 moves leftwards, and the positioning slider 40 moves leftwards.

When the lower end surface of the upper die base 60 rotates to the plane where the upper end surface of the positioning slide block 40 is located, the positioning plate 42 moves leftwards along with the positioning slide block 40 to the left side of the die base rotating block 21, and when the die base rotating block 21 rotates ninety degrees, the positioning slide block 40 moves leftwards to touch the left end surface of the positioning slide block cavity 11.

At the moment, the nut 48 moves leftwards to the leftmost side of the bidirectional threads on the outer circular surface of the bidirectional screw rod 33, the die holder rotating block 21 continues to rotate, the bidirectional screw rod 33 continues to rotate, the nut 48 moves rightwards again under the action of the bidirectional threads, the positioning slide block 40 is driven to start moving rightwards, and when the die holder rotating block 21 rotates one hundred eighty degrees, the nut 48 moves rightwards to the initial position.

At this time, the upper die 61 is located on the lower side of the lower die fixing seat 64, the positioning plate 42 is located at the positioning position, and if the positioning is needed to be repositioned, the pawl electromagnet 74 is started, so that the pawl electromagnet 74 is electrified to attract the magnetic pawl 76, the magnetic pawl 76 is driven to overcome the elastic force of the pawl spring 75 to move downwards to be far away from the ratchet wheel 70, the ratchet wheel 70 can freely rotate after being limited by the magnetic pawl 76, the limiting gear shaft 46 is enabled to rotate reversely under the torsion action of the reset torsion spring 72, and the positioning plate rack 41 is driven to move rightwards to the initial position.

At this time, the pawl electromagnet 74 is turned off, so that the magnetic pawl 76 moves upward under the elastic force of the pawl spring 75 to abut against the ratchet 70, so that the ratchet 70 cannot move freely, and the plate is pushed to be positioned again.

The plate is placed on the upper die 61, after the plate is repositioned, the lower die electromagnet 67 is started, the lower die electromagnet 67 electrically repels the lower die fixing seat 64, the lower die fixing seat 64 overcomes the pulling force of the lower die return spring 68 and moves downwards to touch the upper surface of the plate, the lower die fixing seat 64 continues to move downwards, the plate is bent downwards under the action of the V-shaped groove, and therefore the bending direction of the plate is changed.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.

Claims

1. The utility model provides a sheet bending die, includes the main tank body, its characterized in that: the front end surface and the rear end surface of the main box body are respectively fixed with a rotating seat box body which is symmetrically arranged in front and back, a mould switching mechanism is arranged between the rotating seat box bodies on the front side and the rear side, and a plate positioning mechanism is arranged in the main box body;

2. A plate bending die according to claim 1, wherein: the automatic transmission mechanism is characterized in that a positioning slider cavity with a right opening is arranged in the main box body, a bevel gear transmission cavity is arranged on the left side of the positioning slider cavity, a left end wall of the positioning slider cavity is in rotary fit and extends rightwards to the inside of the positioning slider cavity and extends leftwards to the inside of the bevel gear transmission cavity, a driven bevel gear is fixed at the tail end of the left side of the bidirectional screw, a rear side is arranged in the rotary seat box body and is located in a transmission belt cavity at the rear side of the bevel gear transmission cavity, a front end wall of the transmission belt cavity is in rotary fit and extends forwards to a driving bevel gear shaft in the bevel gear transmission cavity and extends backwards to the inside of the transmission belt cavity, and a driving bevel gear meshed with the driven bevel gear is fixed at the tail end of the front side of the driving bevel gear shaft.

3. A plate bending die according to claim 1, wherein: a die holder rotating block is rotationally matched in the rotating seat box body, an annular rack which is annularly arranged by taking the rotating seat box body as a center is fixed on the outer circular surface of the rotating seat box body, a transmission straight gear cavity is arranged on the left side of the annular rack, a transmission straight gear shaft which extends inwards into the transmission straight gear cavity is rotationally matched with the outer end wall of the transmission straight gear cavity, the inboard end of transmission straight-tooth gear axle be fixed with annular rack toothing's transmission straight-tooth gear, the rear side the transmission straight-tooth gear axle extends to behind the axial drive belt intracavity, the rear side transmission straight-tooth gear axle rear side end with power fit has the drive belt between the initiative bevel gear axle, the front side transmission straight-tooth gear chamber front side be equipped with the front side rotate seat box body fixed connection's motor, the front side transmission straight-tooth gear axle extend to before the axial with motor rear end face fixed connection.

4. A plate bending die according to claim 1, wherein: the plate positioning mechanism also comprises a positioning plate rack arranged in the positioning sliding block, a positioning plate is fixed on the right end face of the positioning plate rack, a rack sliding cavity with a right opening is arranged in the positioning slide block, a pair of sliding pairs is formed between the positioning plate rack and the rack sliding cavity, the upper side of the rack sliding cavity is communicated with a limit gear cavity, the rear end wall of the limit gear cavity is rotationally matched with a limit gear shaft which extends forwards into the limit gear cavity, a limit gear meshed with the upper end surface of the positioning plate rack is fixed at the tail end of the front side of the limit gear shaft, a bidirectional screw rod cavity with a backward opening is arranged in the positioning slide block, a nut is fixed in the inner wall of the bidirectional screw rod cavity, the bidirectional screw rod extends rightwards into the bidirectional screw rod cavity and is in threaded fit connection with the nut, and a reset torsion spring is fixed between the front end surface of the limiting gear shaft and the front end wall of the limiting gear cavity.

5. A plate bending die according to claim 1, wherein: stop gear still including set up in the pawl electro-magnet of magnetism pawl downside, limiting gear chamber rear side is equipped with the ratchet chamber, ratchet chamber downside intercommunication is equipped with the pawl and slides the chamber, extending to behind the limiting gear axial the ratchet intracavity the end of ratchet chamber rear side is fixed with the ratchet, the magnetism pawl with form a pair of slip pair between the pawl slides the chamber, the pawl electro-magnet is fixed in on the end wall under the pawl slides the chamber, the magnetism pawl with be fixed with the pawl spring between the pawl electro-magnet.

6. A plate bending die according to claim 5, wherein: the outer circle surface of the ratchet wheel is provided with ratchet teeth, and the magnetic pawl can be abutted to the ratchet wheel.

7. A plate bending die according to claim 1, wherein: the mould shifter mechanism is characterized by further comprising an upper mould electromagnet arranged on the outer side of the upper mould and a lower mould electromagnet arranged on the outer side of the lower mould fixing seat, wherein two clamping block fixing seats with front and back mirror images arranged are fixed on the left and right end faces of the lower mould fixing seat, a lower mould clamping block is arranged in the clamping block fixing seat in a thread fit mode, the rear end face of the mould seat is fixed on the rear end face of the rotating seat box body, the front end face of the mould seat is fixed on the front side of the rotating seat box body, the upper mould sliding cavity with a downward opening is arranged in the mould seat, a pair of sliding pairs is formed between the upper mould and the upper mould sliding cavity, an upper mould limiting block positioned on the outer side of the upper mould is fixed on the bottom wall of the upper mould sliding cavity, and the outer end face of the upper mould is fixed with an upper mould resetting bomb fixedly connected with the inner end face of the upper mould A spring.

8. A plate bending die according to claim 7, wherein: the downside be equipped with the ascending lower mould sliding chamber of opening in the die holder, the lower mould fixing base with it is vice to form a pair of slip between the lower mould sliding chamber, be fixed with on the lower mould sliding chamber inner wall and be located the lower mould stopper in the lower mould fixing base outside, lower mould fixing base outside end face is fixed with and runs through to extend outward the lower mould stopper to with lower mould electro-magnet medial surface fixed connection's lower mould reset spring.