CN111673015A

CN111673015A - Foot shearing device

Info

Publication number: CN111673015A
Application number: CN202010675601.8A
Authority: CN
Inventors: 安凌; 王华林
Original assignee: Mold Masters Kunshan Co Ltd
Current assignee: Mold Masters Kunshan Co Ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2020-09-18

Abstract

The invention belongs to the technical field of electronic assembly and discloses a pin shearing device. Should cut foot device includes: a machine platform which is provided with a vertically through lap joint part; a tray replaceably overlapped on the overlapping part, the tray having pin holes corresponding to positions of the pins of the electronic component mounted on the PCB one by one, so that the pins of the electronic component can penetrate the pin holes and the overlong portions of the pins can extend out of the bottom surface of the tray when the PCB is mounted on the tray; and the shearing mechanism is abutted against the bottom surface of the tray so as to cut off the part of the pin extending out of the bottom surface of the tray after moving along the bottom surface of the tray. The pin cutting device can cut off overlong parts of pins of all electronic elements on the PCB at one time.

Description

Foot shearing device

Technical Field

The invention relates to the technical field of electronic assembly, in particular to a pin shearing device.

Background

The pin cutting method of electronic components commonly used in the electronic processing and assembling industry at present is to configure a pin cutting device for each type of electronic components mounted in a processed PCB, so as to perform separate pin cutting on each electronic component, and then insert each type of electronic components into the PCB for soldering.

In view of the above, it is necessary to purchase various pin shearing devices, which is expensive in investment cost. Meanwhile, the assembly mode of firstly cutting the pins and then inserting the pins is low in efficiency, and manpower is wasted. In addition, after each electronic component with pre-cut pins is inserted into the PCB, the length of each pin of each electronic component cannot be ensured to be adapted to the thickness of the PCB, and if the pin is too long, a short circuit of the product will be caused.

Disclosure of Invention

The invention aims to provide a pin cutting device which can cut off overlong parts of pins of various electronic elements on a PCB at one time.

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

a pin cutting device for cutting off an excess length of a pin of an electronic component mounted on a PCB, comprising:

a machine platform which is provided with a vertically through lap joint part;

a tray replaceably overlapped on the overlapping part, the tray having pin holes corresponding to positions of the pins of the electronic component mounted on the PCB one by one, so that the pins of the electronic component can penetrate the pin holes and the overlong portions of the pins can extend out of the bottom surface of the tray when the PCB is mounted on the tray; and

and the shearing mechanism is abutted against the bottom surface of the tray so as to cut off the part of the pin extending out of the bottom surface of the tray after moving along the bottom surface of the tray.

Preferably, the pin shearing device further comprises a pressing mechanism configured to press the PCB and the electronic component when the pin is cut off by the shearing mechanism.

Preferably, the pressure holding mechanism includes:

the lifting plate is positioned above the machine table and can move towards or away from the tray; and

the pressing and holding pieces are penetratingly arranged on the lifting plate and can slide along the vertical direction, and the part of the pressing and holding pieces penetrating out of the lifting plate downwards can be abutted against the PCB and the electronic element when the lifting plate descends to be close to the tray.

Preferably, a plurality of the pressing pieces are distributed in an array.

Preferably, the shearing mechanism includes:

a cutter; and

the floating support assembly is configured to drive the cutters to move and can upwards press the cutters so as to enable each cutter to be kept in contact with the bottom surface of the tray.

Preferably, the floating support assembly comprises a base body and a floating support part, wherein the base body can move along a preset shearing direction parallel to the bottom surface of the tray; the floating support includes:

the hollow column is fixed on the base body and provided with a guide hole extending along the vertical direction;

the gasket is fixed at the bottom of the cutter;

the guide post is fixed in the cutter, penetrates through the gasket and is movably inserted into the guide hole; and

and two ends of the spring are respectively connected or abutted to the gasket and the base body.

Preferably, the diameter of the guide hole is larger than the diameter of the guide pillar; the top of the guide post is provided with a spherical crown part protruding upwards; the gasket bottom is located the circumference of guide pillar is provided with the guide housing, the guide housing bottom has the ball cage portion of establishing of upwards caving in, ball cage portion can with ball crown portion sliding contact.

Preferably, the number of the tools is plural, the plural tools are arranged side by side, and the plural floating support portions support the plural tools in a one-to-one correspondence.

Preferably, the cutting edge of the cutter is serrated.

Preferably, the substrate is configured to be reciprocally swung perpendicular to the preset shearing direction while being moved in the preset shearing direction.

The invention has the beneficial effects that:

when the pin shearing device provided by the invention is used for shearing pins, the PCB can be manually placed on the tray, then each electronic element is installed on the PCB, meanwhile, pins of the electronic element can penetrate through the PCB through holes and the tray through holes, the part of each electronic element, which penetrates out of the pin hole, is the overlong part to be cut, and after the shearing mechanism moves along the bottom surface of the tray for shearing, the overlong part of each electronic element, which is cut by the pin shearing mechanism, can be removed at one time, so that the pin shearing efficiency is greatly improved. And, to the pin shearing operation of the PCB board with different electronic component mounting positions or different types of mounted electronic components, it is sufficient to correspondingly configure the trays with different sizes, positions, numbers and other pin hole parameters. The thickness of each tray can be adjusted adaptively, so that pins with different lengths can be reserved after the pins of the electronic elements on the PCB are cut.

Drawings

Fig. 1 is a schematic structural view of a foot cutting device in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a foot shearing device in an embodiment of the invention during foot shearing operation;

FIG. 3 is a schematic structural view of a tray in an embodiment of the invention;

FIG. 4 is a schematic view of the structure of a cutter in an embodiment of the invention;

FIG. 5 is a schematic structural view of a shearing mechanism in an embodiment of the invention;

fig. 6 is a partial cross-sectional view of a shearing mechanism in an embodiment of the invention.

In the figure:

1. a machine platform; 11. a lap joint section;

2. a tray; 21. a pin hole;

3. a shearing mechanism; 31. a cutter; 32. a floating support assembly; 321. a substrate; 322. a hollow column; 3221. a guide hole; 3222. a ball crown portion; 323. a gasket; 324. a guide post; 325. a spring; 326. a guide housing; 3261. a ball cage portion;

4. a pressing mechanism; 41. a lifting plate; 42. a pressing member;

10. a PCB; 20. an electronic component; 201. a pin;

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; the two electronic components may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of the two electronic components or may be in an interaction relationship with the two electronic components. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or electronic element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The present embodiment provides a pin cutting apparatus capable of cutting off an excessively long portion of a pin of an electronic component mounted on a PCB, particularly, allowing the excessively long portion of the pin of each electronic component mounted on the PCB to be cut off at one time.

Referring to fig. 1, 2 and 3, the pin shearing apparatus includes a machine table 1, a tray 2 and a shearing mechanism 3. The machine base 1 has a vertically through lap joint 11. The tray 2 is replaceably overlapped on the overlapping part 11, and the tray 2 has pin holes 21 corresponding to positions of the pins 201 of the electronic component 20 mounted on the PCB10 one by one, so that the pins 201 of the electronic component 20 can penetrate the pin holes 21 and the overlength parts of the pins 201 can extend out of the bottom surface of the tray 2 when the PCB10 is mounted on the tray 2. The shearing mechanism 3 abuts against the bottom surface of the tray 2 so as to be able to cut off the portion of the lead 201 extending out of the bottom surface of the tray 2 after moving along the bottom surface of the tray 2.

When the pin shearing mechanism is used for shearing pins, the PCB10 can be manually placed on the tray 2, then the electronic elements 20 are installed on the PCB10, meanwhile, pins 201 of the electronic elements 20 can penetrate through holes in the PCB10 and pin holes 21 formed in the tray 2, the parts of the pins 201 of the electronic elements 20, penetrating out of the pin holes 21, are overlong parts to be cut, and after the shearing mechanism 3 moves along the bottom surface of the tray 2 for shearing, the overlong parts of the pins 201 of the electronic elements 20 can be cut at one time, so that the efficiency of the pin shearing operation is greatly improved.

It can be understood that, regarding the pin cutting operation of the PCB10 with different mounting positions of the electronic component 20 or different types of the mounted electronic component 20, the tray 2 with different parameters of the pin holes 21, such as different sizes, positions, and numbers, may be configured correspondingly. The thickness of each tray 2 may also be adapted to allow for different lengths of leads 201 to be left behind after the cutting of the pins of the electronic components 20 on the PCB 10.

In order to prevent the electronic components 20 mounted on the PCB10 from being dislocated after the cutting mechanism 3 acts on the pins 201 of the electronic components 20 mounted on the PCB10 during the pin cutting operation, the diameter of each pin hole 21 may be limited to be slightly larger than the diameter of the pin 201 of the corresponding electronic component 20 inserted therein.

Further, the pin shearing device further comprises a pressing mechanism 4, wherein the pressing mechanism 4 is configured to press the PCB10 and the electronic component 20 when the pin 201 is cut off by the shearing mechanism 3, so that the PCB10 and the electronic component 20 mounted thereon are not deviated or dislocated when being sheared by the shearing mechanism 3, and the pin shearing effect is ensured.

Referring to fig. 1 and 2, in the present embodiment, the pressing mechanism 4 includes a lifting plate 41 and a plurality of pressing members 42. The lifting plate 41 is located above the machine table 1 and can move toward or away from the tray 2. The pressing members 42 are penetratingly disposed on the lifting plate 41 and can slide vertically, and a portion of the pressing members 42 that passes downward through the lifting plate 41 can press the PCB10 and the electronic component 20 when the lifting plate 41 is lowered to be adjacent to the tray 2.

It is understood that the lifting plate 41 may be disposed at the movable end of a lifting mechanism such as a lifting module, a hydraulic lifting platform, etc. The pressing member 42 is provided with a limit structure engaged with the lifting plate 41, and the limit structure is used for keeping the pressing member 42 on the lifting plate 41, i.e. preventing the pressing member 42 from sliding downwards out of the lifting plate 41. For example, the pressing member 42 may be a column, the top of the column has a head with a diameter slightly larger than the diameter of the main body, a through hole with a diameter larger than or equal to the diameter of the main body of the pressing member 42 and the diameter of the head of the pressing member 42 is vertically arranged on the lifting plate 41, and the pressing member 42 penetrates into the through hole from above the lifting plate 41.

When the elevating plate 41 is lowered to be adjacent to the tray 2, each of the pressing pieces 42 can be pressed down on the board body of the PCB10 and each of the electronic components 20, respectively, thereby holding the PCB10 and the electronic components 20 by the own weight of the pressing piece 42. Furthermore, since the pressing member 42 is slidably connected to the lifting plate 41, after the individual pressing member 42 abuts against the electronic component 20 at a higher position, the rest of the pressing members 42 can continue to descend along with the lifting plate 41 until the pressing members abut against the PCB10 or the electronic component 20 below.

To ensure that each electronic component 20 can be pressed by the pressing member 42, a plurality of pressing members 42 are preferably arranged in an array, and the pressing members 42 can be disposed adjacent to each other. Meanwhile, the pressing and holding pieces 42 distributed in the array can enable all parts of the whole PCB10 to be uniformly pressed without warping.

In other alternative embodiments, the pressing member 42 may also be an elastic material, such as a pressure-equalizing sponge, which can elastically deform after being pressed against the PCB10 or the electronic component 20, and can recover from deformation after being separated from the PCB10 or the electronic component 20, which will not be described herein.

Referring to fig. 4 to 6, in the present embodiment, the shearing mechanism 3 includes a cutter 31 and a floating support assembly 32, the floating support assembly 32 is configured to drive the cutter 31 to move, and can press the cutter 31 upward to keep each cutter 31 in contact with the bottom surface of the tray 2, that is, during the process of moving the cutter 31 to shear the pins 201, the floating support assembly 32 can continuously press the cutter 31 to cut off the pins 201 of each electronic component 20 in order.

Specifically, the main structure of the cutting mechanism 3 may be a commercially available pin cutter, that is, the floating support assembly 32 is driven by the pin cutter to move, and the floating support assembly 32 drives the cutter 31 to perform a cutting action.

Referring to fig. 6, the floating support assembly 32 includes a base 321 and a floating support, the base 321 is fixedly connected to the movable end of the pin cutter and can move in a preset cutting direction parallel to the bottom surface of the tray 2. The floating support includes a hollow post 322, a washer 323, a guide post 324, and a spring 325. The hollow post 322 is fixed to the base 321, and the hollow post 322 has a guide hole 3221 extending in a vertical direction. The shim 323 is fixed to the bottom of the cutter 31. The guide post 324 is fixed to the cutter 31, and the guide post 324 passes through the pad 323 and is movably inserted into the guide hole 3221. Both ends of the spring 325 are connected to or abutted against the spacer 323 and the base 321, respectively.

The spring 325 may be configured to have a length such that the height position of the cutter 31 is higher than the lowest point of the lap 11 when the spring 325 is fully extended, that is, when the tray 2 is not mounted on the lap 11, so that the tray 2 can press the cutter 31 after the tray 2 is mounted on the lap 11, with the spring 325 being in a compressed state, thereby pressing the cutter 31 upward and reversely, keeping the cutter 31 in abutment with the bottom surface of the tray 2.

Preferably, the diameter of the guide hole 3221 is larger than the diameter of the guide post 324. The top of the guide post 324 is in the form of a spherical cap 3222 with an upward projection. The bottom of the pad 323 is provided with a guide cover 326 at the circumference of the guide post 324, and the bottom of the guide cover 326 is provided with a ball cage portion 3261 recessed upwards, and the ball cage portion 3261 can be in sliding contact with the spherical cap portion 3222.

When the bottom surface of the tray 2 is warped and deformed due to long-term use or the like, the moving cutter 31 moves to the convex portion on the bottom surface of the tray 2 to adapt to the shape of the tray 2, and the whole moves downward, so that a gap is generated between the portion of the cutter 31 not contacting the convex portion and the bottom surface of the tray 2, and the accuracy of the length of the cutting leg is affected.

By means of the structure, when the moving cutter 31 moves to the convex part on the bottom surface of the tray 2, the ball cage part 3261 can rotate universally on the ball convex part, so that the cutter 31 is allowed to incline, the bottom surface buckling deformation of the tray 2 is adapted to the maximum extent, and the influence on the accuracy of the length of the pin shear caused by the buckling deformation of the bottom surface of the tray 2 is reduced or even avoided.

Preferably, the number of the cutters 31 may be multiple, the cutters 31 are arranged side by side to match the trimming pins 201, and the floating supports support the cutters 31 in a one-to-one correspondence. The cutters 31 are not rigidly connected, so that when part of the cutters 31 move to the convex part on the bottom surface of the tray 2, the rest cutters 31 do not move along with the cutters 31 and always keep against the bottom surface of the tray 2, thereby further ensuring the accuracy requirement of the length of the shearing leg.

As shown in fig. 5 and 6, each cutter 31 may be cooperatively supported by a pair of floating supports provided at both end portions of the cutter 31 to make the movement of the cutter 31 more smooth.

Referring to fig. 4, in the embodiment, the blade of the cutter 31 is serrated, and when the serrated blade moves relative to the pin 201 and cuts the pin 201, the cutting angle can form a certain included angle with the advancing direction of the cutter 31, compared with the flat cutting method, the cutting path of the blade acting on the pin 201 is longer, the cutting force can be differentiated along with the cutting angle, the stress on the pin 201 is reduced, the cutting process is more stable, and the cutting effect is good. In addition, both sides of the cutter can be provided with cutting edges so as to carry out foot cutting operation when the cutter moves forwards or backwards.

Further, in this embodiment, the pin shearing mechanism preferably employs a pendulum pin shearing machine, so that when the base 321 can move along the preset shearing direction, it can simultaneously swing back and forth perpendicular to the preset shearing direction, so that the above-mentioned serrated blade can cut the pin 201 in a "saw" manner, and the pin shearing process is smoother.

It should be noted that the above-mentioned lead screw lifting module, hydraulic lifting platform, pin shearing machine, pendulum pin shearing machine, etc. are all applied industrially in the prior art, and therefore, the structure and working method thereof are not described herein.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pin shearing apparatus for shearing off excess lengths of pins (201) of an electronic component (20) mounted on a PCB (10), comprising:

a machine base (1) having a vertically-through lap joint part (11);

a tray (2) alternatively lapped on the lapping part (11), wherein the tray (2) is provided with pin holes (21) which correspond to the positions of the pins (201) of the electronic element (20) installed on the PCB (10) in a one-to-one mode, so that when the PCB (10) is placed on the tray (2), the pins (201) of the electronic element (20) can penetrate into the pin holes (21), and the overlong parts of the pins (201) extend out of the bottom surface of the tray (2); and

and the shearing mechanism (3) is abutted against the bottom surface of the tray (2) so as to cut off the part of the pin (201) extending out of the bottom surface of the tray (2) after moving along the bottom surface of the tray (2).

2. The device according to claim 1, characterized in that the device further comprises a holding mechanism (4), the holding mechanism (4) being configured to hold the PCB (10) and the electronic component (20) while the cutting mechanism (3) cuts off the pin (201).

3. A device according to claim 2, wherein the holding-down means (4) comprises:

the lifting plate (41) is positioned above the machine table (1) and can move towards or away from the tray (2); and

the pressing pieces (42) are penetratingly arranged on the lifting plate (41) and can slide along the vertical direction, and the portions, penetrating out of the lifting plate (41), of the pressing pieces (42) can press the PCB (10) and the electronic element (20) when the lifting plate (41) descends to be close to the tray (2).

4. A device according to claim 3, wherein a plurality of said holding-down members (42) are arranged in an array.

5. A device according to claim 1, wherein the cutting mechanism (3) comprises:

a cutter (31); and

the floating support assembly (32) is configured to drive the cutters (31) to move, and can upwards press the cutters (31) so as to enable each cutter (31) to be kept in contact with the bottom surface of the tray (2).

6. A device according to claim 1, characterized in that the floating support assembly (32) comprises a base body (321) and a floating support, the base body (321) being movable in a preset shearing direction parallel to the bottom surface of the tray (2); the floating support includes:

a hollow post (322) fixed to the base (321), the hollow post (322) having a guide hole (3221) extending in a vertical direction;

a gasket (323) fixed to the bottom of the cutter (31);

the guide post (324) is fixed on the cutter (31), and the guide post (324) penetrates through the gasket (323) and is movably inserted into the guide hole (3221); and

and a spring (325) having both ends connected to or abutted against the gasket (323) and the base (321), respectively.

7. A device according to claim 6, wherein:

the diameter of the guide hole (3221) is larger than the diameter of the guide post (324);

the top of the guide post (324) is provided with a spherical crown part (3222) protruding upwards;

a guide cover (326) is arranged at the bottom of the gasket (323) in the circumferential direction of the guide post (324), a ball cage part (3261) which is concave upwards is arranged at the bottom of the guide cover (326), and the ball cage part (3261) can be in sliding contact with the spherical crown part (3222).

8. A device according to claim 6, characterized in that said plurality of knives (31) is provided in plurality, a plurality of said knives (31) being arranged side by side, a plurality of said floating supports supporting a plurality of said knives (31) in a one-to-one correspondence.

9. Device according to any one of claims 5 to 8, characterized in that the cutting edge of the knife (31) is serrated.

10. A device according to claim 6, wherein the base body (321) is configured to move in the predetermined cutting direction while oscillating reciprocally perpendicular to the predetermined cutting direction.