CN111083881A

CN111083881A - Printing backflow jig

Info

Publication number: CN111083881A
Application number: CN201911410793.3A
Authority: CN
Inventors: 林仕强; 朱文敏; 万垂铭; 曾照明
Original assignee: APT Electronics Co Ltd
Current assignee: APT Electronics Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-28

Abstract

The invention provides a printing reflow jig which comprises a jig body, a base, a cover plate and a sliding block. And placing the PCB on a bottom plate in the accommodating groove of the jig body, and automatically fixing the PCB to a frame of the accommodating groove under the driving of the sliding block with the spring. And covering the cover plate, wherein the positioning column on the cover plate acts on the sensor arranged on the base, and the pushing device controlled by the sensor drives the PCB to automatically ascend. When the PCB touches the cover plate and applies a reverse acting force to the cover plate, the sensor stops acting. At this time, the PCB is flush with the surface of the jig. The invention can simultaneously complete the printing of four PCBs, thereby improving the printing efficiency. In addition, can make the automatic parallel and level of PCB in the tool surface, the steel mesh is jack-up by anchor clamps and takes place to warp when avoiding printing, and the location is firm reliable and promoted printing quality.

Description

Printing backflow jig

Technical Field

The invention belongs to the field of semi-surface mounting and pasting printing, and particularly relates to a printing backflow jig.

Background

SMT, also known as surface mount technology, is a new generation of electronic assembly technology developed from hybrid integrated circuit technology, and is characterized by using component surface mount technology and reflow soldering technology, and thus is a new generation of assembly technology in electronic product manufacturing. The wide application of SMT promotes the miniaturization and the multifunctionalization of electronic products, and provides conditions for mass production and low defect rate production.

However, in the production process of the SMT production line, since the PCB and the jig are not on the same plane, the steel mesh is jacked up by the jig during printing to deform, resulting in an unsatisfactory printing effect.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a printing reflow jig, which realizes the functions of automatically positioning PCBs with different thicknesses and leveling the PCBs to the surface of the jig, is firm and reliable in positioning and improves the printing quality.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a printing reflow jig comprises a jig body and a positioning device;

the jig body is provided with an accommodating groove and a bottom plate, and the bottom plate can freely lift in the accommodating groove; the surface of the jig body is provided with a plurality of positioning through holes;

the positioning device comprises a base and a cover plate;

the base is placed below the jig body, the base is provided with a plurality of sensors and a pushing device controlled by the sensors, the sensors are installed on the surface of the base and correspond to the positions of the positioning through holes, and the movable end of the pushing device abuts against the lower side of the bottom plate;

the cover plate is placed above the jig body, positioning columns are arranged on the cover plate corresponding to the plurality of positioning through holes, and the positioning columns can be slidably inserted into the positioning through holes and pressed on the sensors.

Preferably, the bottom plate is provided with a cross beam and a longitudinal beam, and the cross beam and the longitudinal beam can move up and down along with the bottom plate and divide the bottom plate into a plurality of small bottom plates with equal areas.

Preferably, the transverse beam and the longitudinal beam are provided with a plurality of sliding blocks in pairs, the side faces of the sliding blocks are arranged to be of coarsened texture structures attached to the side faces of the PCB, and springs for pushing the sliding blocks to the containing groove frames are arranged between the sliding blocks and the corresponding transverse beam and the corresponding longitudinal beam.

Preferably, the pushing device comprises a push rod and a push plate, the push rod is arranged in the center of the base, and the push plate is arranged on the push rod.

Preferably, a moving groove for lifting and moving the bottom plate is formed in the side face of the jig body, a plurality of threaded holes are formed in the edge of the bottom plate, and fastening bolts penetrate through the moving groove to be in threaded fit with the threaded holes.

Preferably, a pair of the sliding blocks is arranged corresponding to each small bottom plate, and each pair of the sliding blocks is arranged on the edges of the cross beams and the longitudinal beams which form the small bottom plates in a mutually perpendicular state.

Preferably, at least two positioning through holes are provided.

Preferably, the push rod is a pneumatic push rod or a hydraulic transmission push rod.

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

in this scheme, the automatic parallel and level of PCB to the tool surface that the printing backward flow tool can realize different thickness, the steel mesh is by anchor clamps jack-up and take place to warp when avoiding printing, and the location is firm reliable, and printing quality is good.

In this scheme, the printing backward flow tool can realize four PCB simultaneously and automatic fixation to holding tank frame in the horizontal direction, PCB warpage when preventing to flow backward, and printing efficiency is high, saves operating time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic top view of the present invention.

Fig. 2 is a schematic sectional view of the front view structure of the present invention.

Fig. 3 is a front view of the base of the present invention.

Fig. 4 is a schematic front view of the cover plate of the present invention.

Wherein:

1-a jig body, 11-accommodating grooves, 12-longitudinal beams, 13-cross beams, 14-positioning through holes, 15-bottom plates and 151-fastening bolts;

2-positioning device, 21-base, 211-push rod, 212-push plate, 213-sensor, 22-cover plate, 221-positioning column;

3-a slide block.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

As shown in fig. 1 to 4, the present embodiment provides a printing reflow jig, which includes a jig body 1, a positioning device 2 and a slider 3.

The jig body 1 is provided with an accommodating groove 11 and a bottom plate 15, the bottom plate 15 can freely lift in the accommodating groove 11, and at least two positioning through holes 14 are formed in the surface of the jig body 1.

As a preferable scheme, the positioning device 2 includes a base 21 and a cover plate 22, the base 21 is placed below the jig body 1, the base 21 is provided with a plurality of sensors 213 and a pushing device controlled by the sensors 213, the sensors 213 are installed on the surface of the base 21, the positioning through holes 14 are provided with four and the installation positions of the sensors 213 just correspond to the positions of the positioning through holes 14, and the pushing device is located below the bottom plate 15.

Further, the pushing device comprises a push rod 211 and a push plate 212, wherein the push rod 211 is arranged in the center of the base 21, and the push plate 212 is installed on the push rod 211. The push plate 212 has a larger contact area, which makes the positioning process more stable.

As a preferable scheme, the cover plate 22 is placed above the jig body 1, positioning columns 221 are arranged on the cover plate 22 corresponding to the positioning through holes 14, and the positioning columns 221 are slidably inserted into the positioning through holes 14 and press the sensors 213. The pressure acts on the sensor 213 to start the operation of the sensor 213, and the control pushing device drives the bottom plate 15 to complete the lifting action. When the PCB is placed on the bottom plate 15, the pushing device drives the PCB to automatically rise, and when the PCB touches the cover plate 22 and applies a reverse acting force to the cover plate 22, the force acting on the sensor 213 is reduced, and the sensor 213 stops acting. At this moment, PCB parallel and level in tool surface, the steel mesh is by anchor clamps jack-up and take place to warp when avoiding printing, and the location is firm reliable and promoted printing quality.

Further, four fastening bolts 151 are arranged on the edge of the bottom plate 15, and a moving groove for the fastening bolts 151 to move up and down is formed in the side surface of the jig body 1. When the base plate 15 is raised to a desired height, the fastening bolts 151 are tightened to fix the base plate 15.

As a preferred scheme, the jig body 1 is further provided with a cross beam 13 and a longitudinal beam 12, the cross beam 13 and the longitudinal beam 12 are perpendicularly arranged in the middle of the bottom plate 15 in a crossed mode, the bottom plate 15 is divided into four equal small bottom plates, four PCBs can be printed at the same time, and the printing efficiency is improved.

Furthermore, four pairs of sliding blocks 3 are arranged on the cross beam 13 and the longitudinal beam 12 in pairs, and each pair of sliding blocks 3 are arranged on the edges of the cross beam 13 and the longitudinal beam 12 which form each small bottom plate in a mutually vertical state. Put into the bottom plate in holding tank 11 with PCB on, be provided with the spring between slider 3 and corresponding crossbeam 13, longeron 12, under the drive of spring, slider 3 promotes the frame of fixing to holding tank 11 with PCB automatically.

The side face of the sliding block 3 is provided with a coarsening texture structure attached to the side face of the PCB. Make slider and PCB laminate completely, block PCB upward movement, PCB warpage when preventing the backward flow improves printing quality.

The working principle of the invention is as follows: place PCB on the bottom plate in the holding tank, cover the apron, reference column on the apron passes behind the positioning hole and exerts a pressure for the sensor. At this moment, the push pedal on the base promotes the bottom plate upward movement, and PCB contact apron on the bottom plate gives apron ascending thrust to the pressure that the reference column was exerted on the sensor reduces, and push pedal stop motion makes PCB stop in the position with tool surface parallel and level.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A printing reflow jig is characterized by comprising a jig body and a positioning device;

the positioning device comprises a base and a cover plate;

2. The printing reflow jig of claim 1, wherein the bottom plate is provided with a cross beam and a longitudinal beam, and the cross beam and the longitudinal beam can move up and down along with the bottom plate and divide the bottom plate into a plurality of small bottom plates with equal areas.

3. The print reflow jig of claim 2, wherein a plurality of sliders are arranged on the cross beam and the longitudinal beam in pairs, the side surfaces of the sliders are provided with rough texture structures attached to the side surfaces of the PCB, and a spring is arranged between each slider and the corresponding cross beam and the corresponding longitudinal beam to push the slider to the receiving groove frame.

4. The print reflow jig of claim 1, wherein the pushing device comprises a pushing rod and a pushing plate, the pushing rod is disposed at the center of the base, and the pushing plate is mounted on the pushing rod.

5. The printing reflow jig of claim 2, wherein the jig body has a moving slot on a side thereof for the bottom plate to move up and down, the bottom plate has a plurality of threaded holes on an edge thereof, and fastening bolts are threaded through the moving slot and the threaded holes.

6. The printing reflow jig of claim 3, wherein a pair of the sliding blocks is disposed corresponding to each small bottom plate, and each pair of the sliding blocks is disposed at the edge of the cross beam and the longitudinal beam that form the small bottom plate in a mutually perpendicular state.

7. The printing reflow jig of claim 1, wherein at least two positioning through holes are provided.

8. The print reflow tool of claim 4, wherein the push rod is a pneumatic push rod or a hydraulic drive push rod.