CN215965758U - Belt material positive and negative blanking and separating device for motor iron core - Google Patents

Abstract

The utility model discloses a strip material positive and negative blanking separation device for a motor iron core, wherein an upper blanking structure comprises an upper die holder and a discharging assembly, a first female die and a first male die are fixed at the lower part of the upper die holder, the first male die and the first female die penetrate through the discharging assembly, and a first blanking cavity is arranged on the first female die; the lower punching structure comprises a lower die holder and a fixing plate, the fixing plate is fixed on the upper portion of the lower die holder, a second cavity and a third cavity are arranged on the fixing plate, a second female die is fixed in the second cavity, a second punching cavity is arranged on the second female die, a material supporting block is arranged in the second punching cavity, a first movable discharging plate is arranged in the third cavity, a second male die corresponding to the first punching cavity is fixed on the upper portion of the lower die holder, and the second male die penetrates through the first movable discharging plate. It carries out the blanking effective separation to four fashioned motor core with area material junction to further promote material utilization ratio, improve production efficiency, reduce manufacturing cost, promoted the market competition of product.

Description

Belt material positive and negative blanking and separating device for motor iron core

Technical Field

The utility model relates to the technical field of blanking devices, in particular to a positive and negative strip blanking and separating device for a motor iron core.

Background

At present, a continuous blanking die is used for blanking a material belt so as to blank two belt materials 100 for motor cores from the material belt and relatively form the belt materials, on the basis of the influence of a blanking process, other steel sheets except products in continuous blanking become waste materials, the material utilization rate is low, and only two products (as shown in fig. 1) can be formed in one-time blanking, so that the production efficiency is low; if more product material belts need to be produced simultaneously, the production cost is increased, the market competitiveness of products is low, and the requirements on punching machines are increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a positive and negative strip blanking and separating device for a motor iron core, which is designed for overcoming the defects of the prior art, improves the material utilization rate and improves the production efficiency.

The technical scheme of the utility model is as follows: the positive and negative strip blanking and separating device for the motor iron core comprises an upper blanking structure and a lower blanking structure, wherein the upper blanking structure comprises an upper die base and a discharging assembly, the upper die base comprises a first elastic telescopic mechanism, a first gap is reserved between the lower side surface of the upper die base and the upper side surface of the discharging assembly, the discharging assembly is installed on the upper die base through the first elastic telescopic mechanism, a first female die and a first male die are fixed at the lower part of the upper die base, the first male die and the first female die penetrate through the discharging assembly, and a first blanking cavity is formed in the first female die; the lower punching structure comprises a lower die holder and a fixing plate, the fixing plate is fixed on the upper portion of the lower die holder, a second cavity and a third cavity corresponding to the position of the first die are arranged on the fixing plate, a second die is fixed in the second cavity, a second punching cavity corresponding to the position of the first male die is arranged on the second die, a material supporting block is arranged in the second cavity and comprises a second elastic telescopic mechanism and a third elastic telescopic mechanism, the material supporting block is installed on the second elastic telescopic mechanism, a first movable discharging plate is arranged in the third cavity, the third elastic telescopic mechanism is connected with the first movable discharging plate, a second male die corresponding to the position of the first punching cavity is fixed on the upper portion of the lower die holder, the second male die penetrates through the first movable discharging plate, and a second gap is reserved between the lower side face of the first movable discharging plate and the lower inner wall of the third cavity.

Preferably, the number of the first female dies is two, two rows of first cutting groups are arranged in the middle of the upper die holder, and each first cutting group comprises a plurality of first male dies arranged in a straight line; third concave cavities are formed in two corresponding sides of the second concave cavity, and the second concave die corresponds to the blanking area of the first cutting group in position; the discharging assembly is provided with two depressions, at least one part of each of the two first female dies is respectively sunk into the two depressions, the inner walls of the depressions are provided with a plurality of bulges, the number of the first blanking cavities is multiple, and the bulges are correspondingly inserted into the first blanking cavities; a row of first cutting groups are positioned beside the recess and arranged in parallel; the other row of first cutting groups are positioned beside the other recess and arranged in parallel; the position of the bulge and the position of the first male die are arranged in a staggered manner; the second punch is also provided in plurality, and the second blanking cavity is also provided in plurality.

Preferably, the upper die base sequentially comprises an upper die plate, an upper backing plate and a convex fixing plate from top to bottom, the upper die plate, the upper backing plate and the convex fixing plate are fixedly connected with each other, and the first convex die and the first concave die are fixed on the convex fixing plate; the discharging assembly is positioned below the convex fixing plate, and a first gap exists between the discharging assembly and the convex fixing plate; the first elastic telescopic mechanism is arranged in the upper template.

Preferably, the unloading assembly comprises an unloading plate seat and a second movable unloading plate which are fixed with each other, the unloading plate seat is fixedly connected with the lower end of the first elastic telescopic mechanism, two through holes corresponding to the positions of the two first female dies are formed in the unloading plate seat respectively, the first female dies penetrate through the through holes, the two through holes are provided with a recess close to the inner wall of the side of the second movable unloading plate and the corresponding two side faces of the second movable unloading plate, and the two recess positions correspond to each other.

Preferably, the first elastic telescopic mechanism comprises a first spring, a first plugging fixing piece and a spring pressing pin, a counter bore is formed in the upper template, and the first plugging fixing piece is fixed at a port of an upper hole part of the counter bore; the elastic pressing pin penetrates through the lower hole part of the counter bore and then is fixedly connected with the limiting plate on the discharging plate seat, and the upper step of the elastic pressing pin is in contact limiting with the step in the counter bore; the first spring is arranged in the upper hole part of the counter bore, and two ends of the first spring are respectively abutted against the upper end face of the elastic pressing pin and the first plugging fixing piece.

Preferably, the first female die comprises a guide hole and a material pushing hole which are located beside the first blanking cavity, the upper die plate comprises a fourth elastic telescopic mechanism, a guide pin is arranged in the guide hole, the fourth elastic telescopic mechanism is connected with the guide pin, and a material pushing rod is arranged in the material pushing hole.

Preferably, the fourth elastic telescopic mechanism comprises a second spring and a second plugging fixing piece, the upper template is provided with a first through hole, and the second plugging fixing piece is fixed at the upper port of the first through hole; the second spring is arranged in the first through hole, and two ends of the second spring are respectively abutted against the upper backing plate and the second plugging fixing piece; and the upper end of the pilot pin penetrates through the upper backing plate and is fixedly connected with the lower end of the second spring.

Preferably, the lower die base comprises a lower die plate, a lower backing plate and a lower die fixing plate, wherein the lower backing plate and the lower die fixing plate are fixed on the lower die plate, and the fixing plate is stacked on the upper side face of the lower die fixing plate and is fixedly connected with the lower die plate.

Preferably, a second through hole and a third through hole are formed in the lower template, a second elastic expansion device is installed in the second through hole, a third elastic expansion device is installed in the third through hole, the second elastic expansion device and the third elastic expansion device respectively comprise a third spring, a third plugging fixing part and a connecting rod, the third spring, the third plugging fixing part and the connecting rod are arranged in the second through hole and the third through hole, the third plugging fixing parts in the second through hole and the third through hole plug the lower ports of the second through hole and the third through hole, the threaded third plugging fixing part is connected and fixed by threads, and two ends of the third spring are respectively abutted against the third plugging fixing part and the connecting rod; the material supporting block penetrates through the lower backing plate, the lower die fixing plate and the fixing plate and then abuts against the connecting rod of the second elastic expansion device, and the step of the material supporting block is in contact with the lower side surface of the fixing plate for limiting; the extension rod of the third elastic telescopic device is provided with a notch-shaped rod, the longitudinal part of the notch-shaped rod penetrates through the lower backing plate, the lower die fixing plate and the fixing plate and then is fixedly connected with the first movable discharging plate, and the transverse part of the notch-shaped rod is limited on the lower side surface of the lower backing plate.

The utility model designs a positive and negative blanking and separating device for a belt material for motor iron cores, which is characterized in that a strip material is blanked to form four belt materials for the motor iron cores by utilizing continuous blanking of a continuous blanking die, the four belt materials for the motor iron cores are mutually penetrated and connected, then after an upper blanking structure and a lower blanking structure are mutually closed, positive and negative simultaneous blanking is realized through the matching of a first male die and a second blanking cavity and the matching of the second male die and the first blanking cavity, so that the connection parts of the four belt materials for the motor iron cores are blanked and effectively separated, the utilization rate of materials is further improved, the production efficiency is improved, the manufacturing cost is reduced, and the market competitiveness of products is improved.

Drawings

Fig. 1 is a schematic structural diagram of a prior art blanking of two material belts;

FIG. 2 is a schematic view of the overall structure (one);

FIG. 3 is a schematic view of the upper blanking structure;

FIG. 4 is a schematic diagram of a lower sanction structure;

FIG. 5 is a schematic view of the overall structure (two);

FIG. 6 is a schematic view (III) of the overall structure;

FIG. 7 is a schematic structural view (one) of the first female die (4);

FIG. 8 is a schematic structural view (II) of the first female die (4);

fig. 9 is a schematic structural diagram of forming four material belts.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

Example (b):

the positive and negative strip blanking and separating device for the motor iron core comprises an upper blanking structure and a lower blanking structure, wherein the upper blanking structure comprises an upper die holder 1 and an unloading assembly 2, the upper die holder 1 comprises a first elastic telescopic mechanism 14, a first gap 20 is reserved between the lower side surface of the upper die holder 1 and the upper side surface of the unloading assembly 2, the unloading assembly 2 is mounted on the upper die holder 1 through the first elastic telescopic mechanism 14, a first female die 4 and a first male die 3 are fixed at the lower part of the upper die holder 1, the first male die 3 and the first female die 4 penetrate through the unloading assembly 2, and a first blanking cavity 41 is formed in the first female die 4; the lower punching structure comprises a lower die holder 8 and a fixing plate 9, the fixing plate 9 is fixed at the upper part of the lower die holder 8, the fixing plate 9 is provided with a second cavity 91 and a third cavity 92 corresponding to the position of the first female die 4, a second female die 24 is fixed in the second cavity 91, a second punching cavity 15 corresponding to the position of the first male die 3 is arranged on the second female die 24, the second punching cavity 15 is provided with a material supporting block 16, the lower die holder 8 comprises a second elastic telescopic mechanism 17 and a third elastic telescopic mechanism 18, the material supporting block 16 is arranged on the second elastic telescopic mechanism 17, a first movable discharging plate 10 is arranged in the third cavity 92, the third elastic telescopic mechanism 18 is connected with the first movable discharging plate 10, a second male die 19 corresponding to the position of the first punching cavity 41 is fixed at the upper part of the lower die holder 8, the second male die 19 penetrates through the first movable discharging plate 10, and a second gap 23 is reserved between the lower side surface of the cavity of the first movable discharging plate 10 and the lower inner wall 92; specifically, the number of the first female dies 4 is two, two rows of first cutting groups 30 are arranged in the middle of the upper die base 1, and each first cutting group 30 comprises a plurality of first male dies 3 which are arranged in a straight line; third concave cavities 92 are formed in two corresponding sides of the second concave cavity 91, and the second concave die 24 corresponds to the blanking area of the first cutting group 30; the discharging assembly 2 is provided with two recesses 221, at least one part of the first female die 4 is sunk into the recesses 221, the inner wall of each recess 221 is provided with a plurality of protrusions 222, the number of the first blanking cavities 41 is multiple, and the protrusions 222 are correspondingly inserted into the first blanking cavities 41; a row of first cutting groups 30 are located beside a recess 221 and arranged in parallel with each other; the other row of first cutting groups 30 are positioned beside the other recess 221 and are arranged in parallel; the position of the bulge 222 and the position of the first male die 3 are arranged in a staggered manner; the second male die 19 is also provided in plurality, and the second blanking cavity 15 is also provided in plurality; the structure is arranged according to the corresponding arrangement of the interpenetration parts of the four motor iron cores which are mutually and interpenetrated and connected by the belt material, thereby leading the blanking separation to be reliable. Wherein, the first punch 3, the second punch 19, the first blanking cavity 41, the second blanking cavity 15 and the protrusion 222 in the recess 221 are respectively provided with four or more than four.

During separation, after the four motor iron cores of a product are fed between an upper punching structure and a lower punching structure by a material belt which is mutually inserted and connected by the material belt, the upper punching structure and the lower punching structure are mutually closed, a discharging component 2 compresses the material belt to prevent the material belt from moving up and down, a first male die 3 and a first female die 4 extend out of the discharging component 2 after compression, the material belt enters an inserting part and a second blanking cavity 15 to form forward cutting and blanking, and a lower die support block 16 supports a blanking part downwards at the same time to prevent the material belt from deforming; meanwhile, the first movable stripper 10 descends, so that the second male die 19 extends out of the first movable stripper 10 and then enters another penetrating part of the material belt and the first blanking cavity 41 to form reverse cutting blanking, and the first movable stripper 10 prevents the reverse material belt from deforming. After the forward and reverse blanking is finished, the upper blanking structure ascends and retreats, and all parts return to the original positions. The material belt returns to the original position through the resetting functions of the first movable discharging plate 10, the second movable discharging plate 22 and the material supporting block 16, and normal forward feeding of the material belt is guaranteed. In the process, the material belt is simultaneously blanked in the forward direction and the reverse direction to form the respective independent forming material belt, and the material belt blanking process is completed.

In this embodiment, the upper die holder 1 sequentially includes an upper die plate 11, an upper backing plate 12 and a convex fixing plate 13 from top to bottom, the upper die plate 11, the upper backing plate 12 and the convex fixing plate 13 are fixedly connected with each other through bolts, and the first convex die 3 and the first concave die 4 are both fixed on the convex fixing plate 13 through bolts; the discharging assembly 2 is positioned below the convex fixing plate 13, and a first gap 20 exists between the discharging assembly and the convex fixing plate; first elastic telescoping mechanism 14 is installed in cope match-plate pattern 11, subassembly 2 of unloading includes the unloading board seat 21 and the second activity stripper 22 of reciprocal anchorage, unloading board seat 21 is fixed continuous with the lower extreme of first elastic telescoping mechanism 14, be provided with two perforation 211 that correspond with two first die 4 positions respectively on the unloading board seat 21, first die 4 runs through perforation 211, an inner wall that is close to second activity stripper 22 avris on two perforation 211 and the corresponding both sides face of second activity stripper 22 all are provided with sunken 221, and the sunken 221 position in both places corresponds. The reasonable strip material that makes each four motor core separate reliably with its structural design, promotes performance.

Preferably, the first elastic telescopic mechanism 14 comprises a first spring 142, a first blocking fixing member 141 and a spring pin 143, the upper template 11 is provided with a counterbore 111, and the first blocking fixing member 141 is fixed at a port of an upper hole part of the counterbore 111; the elastic pressing pin 143 penetrates through the lower hole part of the counter bore 111 and then is fixedly connected with the limiting plate 212 on the discharging plate seat 21, and the step at the upper end of the elastic pressing pin 143 is in contact with the step in the counter bore 111 for limiting; the first spring 142 is arranged in the upper hole part of the counter bore 111, and two ends of the first spring 142 respectively abut against the upper end surface of the elastic pressing pin 143 and the first blocking fixing piece 141, so that the structure of the discharging plate seat 21 is compressed and then provides an automatic resetting function through the first spring 142, and the using performance is improved; meanwhile, the elastic pressing pin 143 and the spring are fixed in the upper die plate 11, and the height of the discharging plate seat 21 and the discharging plate is adjusted to a proper height through the height adjustment of the limiting plate 212, so that the effects of protecting the male die and pressing the material belt are achieved.

In this embodiment, first die 4 is including leading positive hole 42 and the ejection of compact hole 43 that is located first blanking chamber 41 side, and cope match-plate pattern 11 includes fourth elastic telescoping mechanism 7, leads to setting up in the positive hole 42 and leads positive round pin 5, and fourth elastic telescoping mechanism 7 is connected with the guide pin, is provided with ejector beam 6 in the ejection of compact hole 43, and after the appointed position was sent to the product material area, go up the cutting structure and drive downward operation by the punch press, lead in the positive round pin 5 nail most advanced feeding area guiding hole, with the material area accurately fixed in place.

Preferably, the fourth elastic telescopic mechanism 7 comprises a second spring 72 and a second blocking fixing piece 71, the upper template 11 is provided with a first through hole 70, and the second blocking fixing piece 71 is fixed at the upper port of the first through hole 70; the second spring 72 is arranged in the first through hole 70, and two ends of the second spring respectively abut against the upper backing plate 12 and the second plugging fixing piece 71; and the upper end of the guide pin 5 penetrates through the upper backing plate 12 and is fixedly connected with the lower end of the second spring 72, so that the telescopic performance of the guide pin 5 is realized, and after the upper blanking structure and the lower blanking structure are closed, the guide pin 5 can retract, but still is inserted into the guide hole 42 of the material belt, and the precision of the blanking position of the material belt is ensured.

In this embodiment, the lower die base 8 includes a lower die plate 81, a lower backing plate 82 fixed on the lower die plate 81, and a lower die fixing plate 83, and the fixing plate 9 is stacked on the upper side surface of the lower die fixing plate 83 and fixedly connected to the lower die plate 81; a second through hole 811 and a third through hole 812 are arranged on the lower template 81, a second elastic telescopic mechanism 17 is arranged in the second through hole 811, a third elastic telescopic mechanism 18 is arranged in the third through hole 812, the second elastic telescopic mechanism 17 and the third elastic telescopic mechanism 18 both comprise a third spring 162, a third blocking fixing member 161 and a connecting rod 163, the second through hole 811 and the third through hole 812 are both provided with the third spring 162, the third blocking fixing member 161 and the connecting rod 163, the third blocking fixing member 161 in the second through hole 811 and the third through hole 812 blocks the lower ports of the second through hole 811 and the third through hole 161, the threaded third blocking fixing member 161 is fixed by adopting threaded connection, and two ends of the third spring 162 are respectively connected with the third blocking fixing member 161 and the connecting rod 163; the material supporting block 16 penetrates through the lower backing plate 82, the lower die fixing plate 83 and the fixing plate 9 and then abuts against the connecting rod 163 of the second elastic telescopic mechanism 17, and the step of the material supporting block 16 is in contact with the lower side surface of the fixing plate 9 for limiting; an annular-notch-shaped rod 164 is arranged on a connecting rod 163 of the third elastic telescopic mechanism 18, the longitudinal part of the annular-notch-shaped rod 164 penetrates through the lower backing plate 82, the lower die fixing plate 83 and the fixing plate 9 and then is fixedly connected with the first movable discharging plate 10, and the transverse part of the annular-notch-shaped rod 164 is limited on the lower side surface of the lower backing plate 82. The structure is reasonably arranged, and a reliable floating effect of the material supporting block 16 and the first movable stripper plate 10 is provided, so that each motor iron core can be conveniently blanked and separated by the belt material 100.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.

Claims (9)

1. The utility model provides a positive and negative blanking separator of belting for motor core, includes upper blanking structure and lower blanking structure, its characterized in that:

the upper punching structure comprises an upper die holder (1) and a discharging assembly (2), the upper die holder (1) comprises a first elastic telescopic mechanism (14), a first gap (20) is reserved between the lower side surface of the upper die holder (1) and the upper side surface of the discharging assembly (2), the discharging assembly (2) is installed on the upper die holder (1) through the first elastic telescopic mechanism (14), a first female die (4) and a first male die (3) are fixed on the lower portion of the upper die holder (1), the first male die (3) and the first female die (4) penetrate through the discharging assembly (2), and a first punching cavity (41) is formed in the first female die (4);

the lower punching structure comprises a lower die holder (8) and a fixing plate (9), the fixing plate (9) is fixed at the upper part of the lower die holder (8), a second concave cavity (91) and a third concave cavity (92) corresponding to the first concave die (4) are arranged on the fixing plate (9), a second concave die (24) is fixed in the second concave cavity (91), a second punching cavity (15) corresponding to the first convex die (3) is arranged on the second concave die (24), a supporting block (16) is arranged in the second punching cavity (15), the lower die holder (8) comprises a second elastic telescoping mechanism (17) and a third elastic telescoping mechanism (18), the supporting block (16) is arranged on the second elastic telescoping mechanism (17), a first movable discharging plate (10) is arranged in the third concave cavity (92), the third elastic telescoping mechanism (18) is connected with the first movable discharging plate (10), a second convex die (19) corresponding to the first punching cavity (41) is fixed at the upper part of the lower die holder (8), the second male die (19) penetrates through the first movable discharging plate (10), and a second gap (23) is reserved between the lower side surface of the first movable discharging plate (10) and the lower inner wall of the third cavity (92).

2. The strip material positive and negative blanking and separating device for the motor iron core according to claim 1, wherein the first female die (4) is provided in two, the middle part of the upper die holder (1) is provided with two rows of first cutting groups (30), and each first cutting group (30) comprises a plurality of first male dies (3) in a straight row; third concave cavities (92) are arranged on two corresponding sides of the second concave cavity (91), and the second concave die (24) corresponds to the blanking area of the first cutting group (30); two recesses (221) are formed in the discharging assembly (2), at least one part of each of the two first female dies (4) is sunk into the two recesses (221), a plurality of protrusions (222) are arranged on the inner walls of the recesses (221), a plurality of first blanking cavities (41) are formed, and the protrusions (222) are inserted into the first blanking cavities (41) correspondingly; a row of first cutting groups (30) are positioned beside a recess (221) and are arranged in parallel; the other row of first cutting groups (30) are positioned beside the other recess (221) and are arranged in parallel; the position of the bulge (222) and the position of the first male die (3) are arranged in a staggered manner; the second punch (19) is also provided in plurality, and the second blanking cavity (15) is also provided in plurality.

3. The strip positive and negative blanking and separating device for the motor iron core according to claim 2, wherein the upper die holder (1) comprises an upper die plate (11), an upper backing plate (12) and a convex fixing plate (13) from top to bottom in sequence, the upper die plate (11), the upper backing plate (12) and the convex fixing plate (13) are fixedly connected with each other, and the first convex die (3) and the first concave die (4) are fixed on the convex fixing plate (13); the discharging assembly (2) is positioned below the convex fixing plate (13) and a first gap (20) exists between the discharging assembly and the convex fixing plate; the first elastic telescopic mechanism (14) is arranged in the upper template (11).

4. The strip positive and negative blanking and separating device for the motor iron core according to claim 3, wherein the discharging assembly (2) comprises a discharging plate seat (21) and a second movable discharging plate (22) which are fixed to each other, the discharging plate seat (21) is fixedly connected to the lower end of the first elastic expansion mechanism (14), two through holes (211) corresponding to the positions of the two first female dies (4) are formed in the discharging plate seat (21), the first female dies (4) penetrate through the through holes (211), an inner wall of the two through holes (211) close to the side of the second movable discharging plate (22) and two corresponding side faces of the second movable discharging plate (22) are provided with recesses (221), and the two recesses (221) correspond to each other.

5. The strip positive and negative blanking and separating device for the motor iron core according to claim 4, wherein the first elastic telescopic mechanism (14) comprises a first spring (142), a first blocking fixing piece (141) and a spring pin (143), a counter bore (111) is arranged on the upper template (11), and the first blocking fixing piece (141) is fixed at a port of an upper hole part of the counter bore (111); the elastic pressing pin (143) penetrates through the lower hole part of the counter bore (111) and then is fixedly connected with the limiting plate (212) on the discharging plate seat (21), and the step at the upper end of the elastic pressing pin (143) is in contact limiting with the step in the counter bore (111); the first spring (142) is arranged in the upper hole part of the counter bore (111), and two ends of the first spring respectively abut against the upper end surface of the elastic pressing pin (143) and the first blocking fixing piece (141).

6. The strip positive and negative blanking and separating device for the motor iron core according to claim 3, wherein the first female die (4) comprises a pilot hole (42) and a material pushing hole (43) which are positioned beside the first blanking cavity (41), the upper die plate (11) comprises a fourth elastic telescopic mechanism (7), a pilot pin (5) is arranged in the pilot hole (42), the fourth elastic telescopic mechanism (7) is connected with the pilot pin, and a material pushing rod (6) is arranged in the material pushing hole (43).

7. The positive and negative blanking and separating device of the belt material for the motor iron core as claimed in claim 6, wherein the fourth elastic expansion mechanism (7) comprises a second spring (72) and a second blocking fixing piece (71), the upper die plate (11) is provided with a first through hole (70), and the second blocking fixing piece (71) is fixed at an upper port of the first through hole (70); the second spring (72) is arranged in the first through hole (70), and two ends of the second spring respectively abut against the upper backing plate (12) and the second plugging fixing piece (71); and the upper end of the pilot pin (5) penetrates through the upper backing plate (12) and is fixedly connected with the lower end of the second spring (72).

8. The positive and negative blanking and separating device for the belt material for the motor iron core according to any one of claims 1 to 7, wherein the lower die holder (8) comprises a lower die plate (81), a lower backing plate (82) fixed on the lower die plate (81) and a lower die fixing plate (83), and the fixing plate (9) is stacked on the upper side surface of the lower die fixing plate (83) and is fixedly connected with the lower die plate (81).

9. The strip material positive and negative blanking and separating device for the motor iron core according to claim 8, wherein a second through hole (811) and a third through hole (812) are formed in the lower die plate (81), a second elastic telescopic mechanism (17) is installed in the second through hole (811), a third elastic telescopic mechanism (18) is installed in the third through hole (812), the second elastic telescopic mechanism (17) and the third elastic telescopic mechanism (18) both comprise a third spring (162), a third blocking fixing part (161) and a connecting rod (163), the material supporting block (16) penetrates through the lower backing plate (82), the lower die fixing plate (83) and the fixing plate (9) and then abuts against the connecting rod (163) of the second elastic telescopic mechanism (17), and the step of the material supporting block (16) contacts with the lower side surface of the fixing plate (9) for limiting; a connecting rod (163) of a third elastic telescopic mechanism (18) is provided with a notch-shaped rod (164), the longitudinal part of the notch-shaped rod (164) penetrates through a lower backing plate (82), a lower die fixing plate (83) and a fixing plate (9) and then is fixedly connected with a first movable discharging plate (10), and the transverse part of the notch-shaped rod (164) is limited at the lower side surface of the lower backing plate (82).

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