CN113770257A

CN113770257A - Quick initial positioning device of lead frame cutting die

Info

Publication number: CN113770257A
Application number: CN202111345789.0A
Authority: CN
Inventors: 冯军民; 王李发; 李勇; 俞世友; 赵清
Original assignee: Ningbo Dezhou Precision Electronic Co ltd
Current assignee: Ningbo Dezhou Precision Electronic Co ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2021-12-10
Anticipated expiration: 2041-11-15
Also published as: CN113770257B

Abstract

The invention discloses a quick initial positioning device for a lead frame cutting die, which comprises a die body, wherein the die body comprises an upper die holder and a lower die holder, an installation frame is fixedly arranged on the side wall of the lower die holder, a rotating shaft is rotatably connected onto the installation frame, an infinitely variable speed roller assembly is arranged on the rotating shaft, a gear assembly is arranged on the side wall of one side of the upper die holder and drives the rotating shaft to rotate in the descending process of the upper die holder, a speed reducing assembly is also arranged on the lower die holder positioned at the feed end of the die body, a transition roller is rotatably connected onto the side wall of the feed end of the lower die holder, the transition roller is fixedly connected with a connecting shaft with the same axle center, and a centrifugal driving assembly is arranged outside the connecting shaft and used for starting the speed reducing assembly to work. The invention relates to the technical field of auxiliary equipment for machining lead frames, and discloses a quick initial positioning device for a lead frame cutting die, which can perform double quick positioning in the feeding process of the lead frame cutting die and effectively ensure the qualification rate of finished lead frame products.

Description

Quick initial positioning device of lead frame cutting die

Technical Field

The invention relates to the technical field of auxiliary equipment for machining lead frames, in particular to a quick initial positioning device for a cutting die of a lead frame.

Background

The lead frame is used as a chip carrier of an integrated circuit, is a key structural member for realizing the electrical connection between a leading-out end of an internal circuit of a chip and an external lead by means of bonding materials (gold wires, aluminum wires and copper wires) to form an electrical circuit, plays a role of a bridge connected with an external lead, needs to be used in most semiconductor integrated blocks and is an important basic material in the electronic information industry.

At present, when a cutting and bending process is required to be simultaneously realized on a lead frame, stamping equipment and a traditional progressive die are adopted, the lead frame stops again after being conveyed in the rapid feeding process, the lead frame slides a small section of displacement under the action of the inertia of the lead frame, the positioning is not accurate, the subsequent bending and cutting process is influenced, and the qualified rate of finished products cannot be guaranteed; and the adaptability of the die is poor, and the lead frame with various lengths cannot be matched.

Therefore, we propose a quick initial positioning device for the cutting die of the lead frame to solve the above problems.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a quick initial positioning device for a lead frame cutting die.

In order to achieve the purpose, the invention adopts the following technical scheme:

a quick initial positioning device for a cutting die of a lead frame comprises a die body, wherein the die body comprises an upper die base and a lower die base, an installation frame is fixedly arranged on the side wall of the lower die base, a rotating shaft is connected to the installation frame in a rotating mode, an infinitely variable speed roller assembly is arranged on the rotating shaft, a gear assembly is arranged on the side wall of one side of the upper die base and drives the rotating shaft to rotate in the descending process of the upper die base, a speed reducing assembly is further arranged on the lower die base located at the feeding end of the die body, a transition roller is connected to the side wall of the feeding end of the lower die base in a rotating mode, the transition roller is fixedly connected with a connecting shaft in a coaxial mode, a centrifugal driving assembly is arranged on the outer side of the connecting shaft and used for starting the speed reducing assembly to work, and the centrifugal driving assembly and the infinitely variable speed roller assembly are driven through a telescopic rubber belt;

the speed reduction assembly comprises a fixed strong magnetic plate, a movable strong magnetic plate, a first compression spring and a dry-type guide rod, wherein the fixed strong magnetic plate is fixedly arranged on the dry-type guide rod, the movable strong magnetic plate is sleeved on the dry-type guide rod in a sliding manner, the fixed strong magnetic plate is positioned right above the movable strong magnetic plate, the magnetic opposite ends of the fixed strong magnetic plate and the dry-type guide rod are oppositely arranged, the first compression spring is sleeved on the dry-type guide rod, and the upper end of the first compression spring is abutted to the lower end side wall of the movable strong magnetic plate.

Preferably, the gear assembly includes gear shell, helical rack, closing cap, guide pillar, second compression spring, gear and guide pin bushing, the gear shell is the uncovered setting in one side, and its inside symmetry is provided with two guide pin bushings, one side symmetry of helical rack is provided with the guide pillar with guide pin bushing gliding mutually, and the outside cover of guide pillar is equipped with second compression spring, the bar opening has been seted up to the lateral wall in the middle of the closing cap, and the closing cap is fixed in the uncovered lateral wall department of gear shell.

Preferably, centrifugal drive subassembly includes centrifugal sleeve axle, centrifuging tube, extension spring, centrifugal rod, wedge, extension board, third compression spring and dead lever, the fixed outside of locating the connecting axle of centrifugal sleeve axle, and the week side of centrifugal sleeve axle is equidistant to articulate has a plurality of centrifuging tubes, be connected with the centrifugal rod through extension spring in the centrifuging tube, the upper end symmetry of die holder is provided with two extension boards, and the symmetry is provided with the dead lever between two extension boards, the wedge slip cap is located in the dead lever, and overlaps on the dead lever and be equipped with third compression spring, the inclined plane of wedge offsets with moving the strong magnetic plate.

Preferably, the end of the centrifugal rod is fixedly connected with a ball, and the ball abuts against a right-angle surface of the wedge-shaped block.

Preferably, infinitely variable speed roller subassembly includes curved roller, dwang, sleeve pipe, thread bush, first hand wheel, screw rod and push pedal cover, the key-type connection between sleeve pipe and the axis of rotation, push pedal cover is inserted and is established in the sleeve pipe and set up rather than clearance fit, one side of mounting bracket is provided with L shape support, and the axis of rotation runs through its lateral wall and is connected rather than rotating, sheathed tube week side equidistant articulated has the dwang, and the free end of each dwang rotates with the lateral wall of the curved roller that corresponds to be connected, one side of curved roller contacts with the lateral wall of L shape support, one side of push pedal cover is fixed to be provided with the thread bush, and threaded connection has the screw rod in the thread bush, the free end of screw rod runs through the lateral wall of mounting bracket and with first hand wheel fixed connection.

Preferably, a material blocking rod is arranged on the side wall of one end, far away from the feeding direction, of the upper die base, and an inclined plane is arranged on the lower side of the material blocking rod.

Preferably, still be provided with adjusting part on the upper die base for adjust the horizontal displacement who keeps off the material pole, adjusting part includes second hand wheel, lead screw, slide bar and two connecting plates, two connecting plates are fixed to be set up in the lower extreme of upper die base, the lead screw runs through one of them connecting plate and rotates with another connecting plate lateral wall to be connected, the bilateral symmetry that keeps off the material pole is provided with two installation ears, the slide bar runs through the lateral wall of one of them installation ear and rather than sliding connection, the lead screw runs through the lateral wall of another installation ear and rather than threaded connection, the one end fixedly connected with second hand wheel of lead screw.

Preferably, the upper end of the lower die holder is symmetrically provided with two limiting plates, and the two limiting plates are arranged in parallel with each other along the feeding direction.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the speed reducing assembly is arranged, and under the action of magnetic fields of the fixed-strength magnetic plate and the movable-strength magnetic plate, resistance is applied to the fed lead frame when the fed lead frame has inertia due to the electromagnetic damping principle, so that the lead frame can stably stop feeding action in time, and the fed lead frame can be rapidly positioned at one time;

furthermore, by arranging the centrifugal driving assembly, when the lead frame is fed, the centrifugal rod extrudes the wedge-shaped block under the action of centrifugal force, so that the movable strong magnetic plate moves downwards, the magnetic field intensity between the movable strong magnetic plate and the wedge-shaped block is further reduced, the influence of electromagnetic damping is reduced, and the smooth feeding of the lead frame is ensured.

2. According to the invention, by arranging the stepless speed change roller assembly, the size of the circumference formed by enclosing the arc-shaped rollers can be adjusted by rotating the first hand wheel according to the length of the lead frame, so that the transmission ratio can be changed, the stepless speed change roller assembly can adapt to the lengths of different lead frames on one hand, and on the other hand, the advancing distance of the lead frames can be accurately grasped, and the secondary positioning of the lead frames before bending and cutting can be ensured.

3. According to the invention, by arranging the material blocking rod, after the lead frame is fed each time, the material blocking rod can carry out final limit on the lead frame, so that the lead frame is prevented from being fed too much due to overlarge front positioning error, and is extruded and returned through the inclined surface on the material blocking rod, and the final safety action is achieved;

further, through setting up adjusting part, according to the self length of lead frame, through rocking the second hand wheel for the lead screw rotates, and because the relation that the screw thread fed, make the position that the striker rod can act on as required carry out the horizontal migration of adaptability.

Drawings

Fig. 1 is a schematic front view of a rapid initial positioning device for a cutting die of a lead frame according to the present invention;

FIG. 2 is a schematic axial side view of a device for rapidly initially positioning a cutting die of a lead frame according to the present invention;

fig. 3 is a left side view structural schematic diagram of a rapid initial positioning device for a lead frame cutting die according to the present invention;

FIG. 4 is a schematic top view of a device for quickly initially positioning a cutting die of a lead frame according to the present invention;

FIG. 5 is a schematic structural view of a connection relationship between a gear assembly and an infinitely variable speed roller assembly of the quick initial positioning device for a lead frame cutting die according to the present invention;

FIG. 6 is a schematic structural view of a gear assembly of the device for rapidly initially positioning a cutting die of a lead frame according to the present invention;

FIG. 7 is a schematic structural diagram of a centrifugal driving assembly of a device for rapidly initially positioning a cutting die of a lead frame according to the present invention;

FIG. 8 is an enlarged view of the structure at A in FIG. 1;

fig. 9 is an enlarged schematic view of a structure at B in fig. 1.

In the figure: 1. a mold body; 101. an upper die holder; 102. a lower die holder; 2. a gear assembly; 201. a gear housing; 202. a helical rack; 203. sealing the cover; 204. a guide post; 205. a second compression spring; 206. a gear; 207. a guide sleeve; 3. an infinitely variable speed roller assembly; 301. an arc-shaped roller; 302. rotating the rod; 303. a sleeve; 304. a threaded sleeve; 305. a first hand wheel; 306. a screw; 307. a push plate sleeve; 4. a centrifugal drive assembly; 401. a centrifugal sleeve shaft; 402. centrifuging the tube; 403. an extension spring; 404. a centrifugal lever; 405. a ball; 406. a wedge block; 407. a support plate; 408. a third compression spring; 409. fixing the rod; 5. a speed reduction assembly; 501. a fixed strength magnetic plate; 502. a dynamic strong magnetic plate; 503. a first compression spring; 504. a stem-shaped guide rod; 6. an adjustment assembly; 601. a second hand wheel; 602. a screw rod; 603. a slide bar; 604. a connecting plate; 7. a material blocking rod; 701. a bevel; 702. mounting lugs; 8. a rubber belt; 9. a mounting frame; 10. a connecting shaft; 11. a transition roll; 12. a limiting plate; 13. an L-shaped bracket; 14. and rotating the shaft.

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.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-9, a rapid initial positioning device for a lead frame cutting die comprises a die body 1, the die body 1 comprises an upper die holder 101 and a lower die holder 102, a mounting frame 9 is fixedly arranged on the side wall of the lower die holder 102, and the mounting frame 9 is rotatably connected with a rotating shaft 14, the rotating shaft 14 is provided with an infinitely variable speed roller assembly 3, one side wall of the upper die base 101 is provided with a gear assembly 2, the rotating shaft 14 is driven to rotate in the descending process of the upper die holder 101, the speed reducing assembly 5 is further arranged on the lower die holder 102 positioned at the feeding end of the die body 1, the transition roller 11 is rotatably connected on the side wall of the feeding end of the lower die holder 102, the transition roller 11 is coaxially and fixedly connected with the connecting shaft 10, the centrifugal driving assembly 4 is arranged outside the connecting shaft 10, the centrifugal driving assembly 4 is used for starting the speed reducing assembly 5 to work, and the centrifugal driving assembly 4 and the stepless speed change roller assembly 3 are transmitted through a telescopic rubber belt 8;

the speed reducing component 5 comprises a fixed strong magnetic plate 501, a movable strong magnetic plate 502, a first compression spring 503 and a dry-type guide rod 504, wherein the fixed strong magnetic plate 501 is fixedly arranged on the dry-type guide rod 504, the movable strong magnetic plate 502 is slidably sleeved on the dry-type guide rod 504, the fixed strong magnetic plate 501 is positioned right above the movable strong magnetic plate 502, the magnetism of the opposite ends of the fixed strong magnetic plate 501 and the dry-type guide rod 504 is opposite, the first compression spring 503 is sleeved on the dry-type guide rod 504, and the upper end of the first compression spring is abutted against the side wall of the lower end of the movable strong magnetic plate 502.

Referring to fig. 1-2 and 5-6, specifically, the gear assembly 2 includes a gear housing 201, a helical rack 202, a cover 203, a guide pillar 204, a second compression spring 205, a gear 206, and guide sleeves 207, the gear housing 201 is disposed with one side open, and two guide sleeves 207 are symmetrically disposed inside the gear housing 201, the guide pillar 204 sliding with the guide sleeves 207 is symmetrically disposed on one side of the helical rack 202, and the second compression spring 205 is sleeved outside the guide pillar 204, a strip-shaped opening is disposed on a middle side wall of the cover 203, and the cover 203 is fixed at the open side wall of the gear housing 201.

It should be noted that the length of the gear housing 201 is only a small distance of the descending distance of the upper die base 101, and it is ensured that the helical rack 202 is separated from the gear 206 after meshing, so as to ensure that the lead frame can stop the feeding movement, and free the subsequent bending and cutting operation time, and in addition, due to the arrangement of the second compression spring 205, after the upper die base 101 moves upwards, the helical rack 202 can be compressed by the gear 206, so as to ensure that the rotating shaft 14 does not reverse to cause the reverse feeding of the lead frame.

Referring to fig. 1-3 and fig. 7-8, specifically, the centrifugal driving assembly 4 includes a centrifugal sleeve 401, a centrifugal tube 402, an extension spring 403, a centrifugal rod 404, a wedge block 406, support plates 407, a third compression spring 408 and a fixing rod 409, the centrifugal sleeve 401 is fixedly sleeved outside the connecting shaft 10, a plurality of centrifugal tubes 402 are hinged around the centrifugal sleeve 401 at equal intervals, the centrifugal tube 402 is connected with the centrifugal rod 404 through the extension spring 403, the end of the centrifugal rod 404 is fixedly connected with a round ball 405, the round ball 405 abuts against the surface of the wedge block 406, by providing a round ball right angle 405, the friction with the wedge block 406 can be reduced, and the normal rotation operation of the whole centrifugal driving assembly 4 can be ensured, the upper end of the centrifugal seat 102 is symmetrically provided with two support plates 407, the fixing rod 409 is symmetrically provided between the two support plates 407, the wedge block 406 is slidably sleeved in the fixing rod 409, and the fixing rod 409 is sleeved with a third compression spring 408, and the inclined surface of the wedge block 406 is abutted against the movable strong magnetic plate 502.

Referring to fig. 1-5, in particular, the infinitely variable speed roller assembly 3 includes an arc roller 301, a rotating rod 302, a sleeve 303, a threaded sleeve 304, a first hand wheel 305, a screw 306 and a push plate sleeve 307, the sleeve 303 is connected with the rotating shaft 14 by a key, the push plate sleeve 307 is inserted into the sleeve 303 and is arranged in a clearance fit manner, one side of the mounting frame 9 is provided with an L-shaped bracket 13, the rotating shaft 14 penetrates through a side wall of the sleeve and is rotatably connected with the side wall, the rotating rods 302 are hinged with the circumference of the sleeve 303 at equal intervals, the free end of each rotating rod 302 is rotatably connected with a side wall of the corresponding arc roller 301, one side of the arc roller 301 is contacted with a side wall of the L-shaped bracket 13, it should be noted that initially, the side wall of the sleeve 303 is not contacted with the side wall of the L-shaped bracket 13, and it is ensured that the sleeve 303 has a moving space when being pushed, thereby ensuring that the arc roller 301 can be opened smoothly along the axial center, a threaded sleeve 304 is fixedly arranged on one side of the push plate sleeve 307, a screw 306 is connected to the threaded sleeve 304 in a threaded manner, and the free end of the screw 306 penetrates through the side wall of the mounting frame 9 and is fixedly connected with the first hand wheel 305.

Referring to fig. 1, specifically, a material blocking rod 7 is arranged on a side wall of one end of the upper die base 101 away from the feeding direction, and an inclined surface 701 is arranged on a lower side of the material blocking rod 7.

Referring to fig. 1 and 9, specifically, an adjusting assembly 6 is further disposed on the upper die base 101 and used for adjusting the horizontal displacement of the material blocking rod 7, the adjusting assembly 6 includes a second hand wheel 601, a lead screw 602, a sliding rod 603 and two connecting plates 604, the two connecting plates 604 are fixedly disposed at the lower end of the upper die base 101, the lead screw 602 penetrates through one of the connecting plates 604 and is rotatably connected with the side wall of the other connecting plate 604, two mounting lugs 702 are symmetrically disposed at two sides of the material blocking rod 7, the sliding rod 603 penetrates through the side wall of one of the mounting lugs 702 and is slidably connected therewith, the lead screw 602 penetrates through the side wall of the other mounting lug 702 and is connected with the other mounting lug in a threaded manner, and one end of the lead screw 602 is fixedly connected with the second hand wheel 601.

According to the length of the lead frame, the second hand wheel 601 needs to be shaken to enable the lead screw 602 to rotate, and due to the thread feeding relationship, the material blocking rod 7 can perform adaptive horizontal movement according to the position needing to be acted.

Referring to the drawings, in particular, two limiting plates 12 are symmetrically arranged at the upper end of the lower die holder 102, and the two limiting plates 12 are arranged in parallel with each other along the feeding direction.

Through setting up two limiting plates 12, can be so that the lead frame can not take place rocking of side at horizontal migration's in-process, and then lead to bending and cut off the process and receive the influence.

The working principle is as follows:

in the process of pressing down the upper die holder 101 in the die body 1 under the action of a driving motor or a press, firstly, the helical rack 202 on the side wall of the upper die holder 101 is meshed with the gear 206 to rotate the rotating shaft 14, so that the arc-shaped roller 301 on the whole sleeve 303 is driven to rotate, the centrifugal sleeve shaft 401 is driven to rotate by the transmission of the rubber belt 8, the connecting shaft 10 drives the transition roller 11 to coaxially rotate, and the lead frame placed on the connecting shaft advances forward by a certain distance;

in the feeding process, when the transition roller 11 drives the lead frame to move forward, the transition roller 11 is stopped after being suddenly started, the lead frame has inertia, so that the lead frame cannot immediately stop moving forward, at the moment, when a metal pin of the lead frame passes between the fixed magnetic plate 501 and the movable magnetic plate 502, due to the electromagnetic damping principle, an induced current can be generated when the conductor passes through a changing magnetic field, so that the conductor is acted by an ampere force, the direction of the force always hinders the movement direction of the conductor, the lead frame can be subjected to the resistance and the trend of instantly stopping moving forward, so that the advancing distance of the lead frame is strictly controlled, and one-time positioning before bending and cutting is ensured;

in addition, for the length of the lead frame itself, the advancing distance of the lead frame can be adaptively adjusted, specifically as follows: according to the length of the lead frame, by manually shaking the first hand wheel 305, the screw 306 rotates in the threaded sleeve 304, and further the push plate sleeve 307 can be driven to move horizontally, so that the sleeve 303 can slide on the rotating shaft 14, because the rotating rod 302 is rotatably connected to the sleeve 303, the rubber belt 8 which is radially opened or closed along the axis of the rotating shaft 14 by the arc roller 301 against the side wall of the L-shaped support 13 has certain elasticity and can be flexibly deformed, so that the circumference of the whole arc roller 301 is adaptively changed, the whole transmission ratio is changed, the rotating speed of the connecting shaft 10 and the transition roller 11 can be changed by driving the rubber belt 8, and further the adaptive adjustment can be performed according to the length of the lead frame, on one hand, the length of different lead frames can be adapted, on the other hand, the advancing distance of the lead frame can be accurately grasped, ensuring the secondary positioning before bending and cutting;

further, in the initial stage of downward movement of the upper die holder 101, that is, in the process of meshing the helical rack 202 with the gear 206, a feeding action of the lead frame is required, at this time, the centrifugal sleeve shaft 401 on the connecting shaft 10 starts to rotate, so that the centrifugal rod 404 in the centrifugal tube 402 extends out and presses the wedge block 406 to move, and the movable ferromagnetic plate 502 is pressed to move downward, so that the distance between the fixed ferromagnetic plate 501 and the movable ferromagnetic plate 502 is increased, the magnetic field strength of the fixed ferromagnetic plate 501 and the movable ferromagnetic plate 502 is exponentially reduced, and thus, the feeding of the lead frame is not greatly hindered.

Finally, after the lead frame feeds at every turn, the striker rod 7 that is located on the terminal lateral wall of upper die base 101 can carry out ultimate spacing to the lead frame, prevent that the error of preceding location is too big, make the lead frame feed too much, thereby return its extrusion through inclined plane 701 on the striker rod 7, reach final insurance effect, therefore, the device is through adjusting drive ratio and electromagnetic damping's dual localization real-time and final insurance measure, thereby can accurately guarantee the lead frame and bend the quick location before cutting off.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The quick initial positioning device for the lead frame cutting die comprises a die body (1), wherein the die body (1) comprises an upper die base (101) and a lower die base (102), and is characterized in that an installation frame (9) is fixedly arranged on the side wall of the lower die base (102), a rotating shaft (14) is rotatably connected onto the installation frame (9), a stepless speed change roller assembly (3) is arranged on the rotating shaft (14), a gear assembly (2) is arranged on the side wall of one side of the upper die base (101), the rotating shaft (14) is driven to rotate in the descending process of the upper die base (101), a speed reduction assembly (5) is further arranged on the lower die base (102) at the feeding end of the die body (1), a transition roller (11) is rotatably connected onto the side wall of the feeding end of the lower die base (102), and the transition roller (11) is fixedly connected with a connecting shaft (10) in the same axis, a centrifugal driving assembly (4) is arranged on the outer side of the connecting shaft (10) and used for starting the speed reducing assembly (5) to work, and the centrifugal driving assembly (4) and the stepless speed change roller assembly (3) are transmitted through a telescopic rubber belt (8);

speed reduction unit (5) are including deciding strong magnetic sheet (501), moving strong magnetic sheet (502), first compression spring (503), do style of calligraphy guide arm (504), decide strong magnetic sheet (501) fixed setting on doing style of calligraphy guide arm (504), move strong magnetic sheet (502) sliding sleeve and locate on doing style of calligraphy guide arm (504), decide strong magnetic sheet (501) and be located and move strong magnetic sheet (502) directly over, and the opposite setting of magnetism of both looks ends, first compression spring (503) cover is located on doing style of calligraphy guide arm (504), and its upper end offsets with the lower extreme lateral wall that moves strong magnetic sheet (502).

2. The quick initial positioning device for the lead frame cutting die according to claim 1, wherein the gear assembly (2) comprises a gear shell (201), a helical rack (202), a cover (203), a guide post (204), a second compression spring (205), a gear (206) and a guide sleeve (207), the gear shell (201) is arranged with one side open, two guide sleeves (207) are symmetrically arranged in the gear shell, the guide post (204) sliding with the guide sleeve (207) is symmetrically arranged on one side of the helical rack (202), the second compression spring (205) is sleeved outside the guide post (204), a strip-shaped opening is formed in the middle side wall of the cover (203), and the cover (203) is fixed at the open side wall of the gear shell (201).

3. The quick initial positioning device for the lead frame cutting die is characterized in that the centrifugal driving assembly (4) comprises a centrifugal sleeve shaft (401), a centrifugal tube (402), an extension spring (403), a centrifugal rod (404), a wedge block (406), support plates (407), a third compression spring (408) and a fixing rod (409), the centrifugal sleeve shaft (401) is fixedly sleeved on the outer side of the connecting shaft (10), the periphery of the centrifugal sleeve shaft (401) is hinged with a plurality of centrifugal tubes (402) at equal intervals, the centrifugal rod (404) is connected in the centrifugal tube (402) through the extension spring (403), the upper end of the lower die holder (102) is symmetrically provided with the two support plates (407), the fixing rod (409) is symmetrically arranged between the two support plates (407), the wedge block (406) is slidably sleeved in the fixing rod (409), and the third compression spring (408) is sleeved on the fixing rod (409), the inclined surface of the wedge block (406) is abutted against the dynamic strong magnetic plate (502).

4. The quick initial positioning device for the lead frame cutting die is characterized in that a ball (405) is fixedly connected to the end of the centrifugal rod (404), and the ball (405) abuts against a right-angle surface of the wedge block (406).

5. The quick initial positioning device of lead frame cutting die according to claim 1, wherein the infinitely variable speed roller assembly (3) comprises an arc-shaped roller (301), a rotating rod (302), a sleeve (303), a threaded sleeve (304), a first hand wheel (305), a screw (306) and a push plate sleeve (307), the sleeve (303) is in key connection with the rotating shaft (14), the push plate sleeve (307) is inserted in the sleeve (303) and is in clearance fit with the sleeve, an L-shaped bracket (13) is arranged on one side of the mounting frame (9), the rotating shaft (14) penetrates through the side wall of the rotating shaft and is in rotating connection with the rotating shaft, the rotating rods (302) are hinged on the periphery of the sleeve (303) at equal intervals, the free end of each rotating rod (302) is in rotating connection with the corresponding side wall of the arc-shaped roller (301), one side of the arc-shaped roller (301) is in contact with the side wall of the L-shaped bracket (13), one side of the push plate sleeve (307) is fixedly provided with a threaded sleeve (304), a screw rod (306) is connected to the threaded sleeve (304) in a threaded mode, and the free end of the screw rod (306) penetrates through the side wall of the mounting frame (9) and is fixedly connected with the first hand wheel (305).

6. The quick initial positioning device for the lead frame cutting die according to claim 1, wherein a material blocking rod (7) is arranged on a side wall of one end of the upper die holder (101) far away from the feeding direction, and an inclined surface (701) is arranged on the lower side of the material blocking rod (7).

7. The quick initial positioning device for the lead frame cutting die according to claim 6, wherein the upper die holder (101) is further provided with an adjusting assembly (6) for adjusting the horizontal displacement of the material blocking rod (7), the adjusting assembly (6) comprises a second hand wheel (601), a lead screw (602), a sliding rod (603) and two connecting plates (604), the two connecting plates (604) are fixedly arranged at the lower end of the upper die holder (101), the lead screw (602) penetrates through one connecting plate (604) and is rotatably connected with the side wall of the other connecting plate (604), two mounting lugs (702) are symmetrically arranged on two sides of the material blocking rod (7), the sliding rod (603) penetrates through the side wall of one mounting lug (702) and is slidably connected with the side wall, the lead screw (602) penetrates through the side wall of the other mounting lug (702) and is in threaded connection with the other mounting lug, one end of the screw rod (602) is fixedly connected with a second hand wheel (601).

8. The quick initial positioning device for the lead frame cutting die is characterized in that two limiting plates (12) are symmetrically arranged at the upper end of the lower die holder (102), and the two limiting plates (12) are arranged in parallel with each other along the feeding direction.