CN103582315B - Printing apparatus and SMT printing machines - Google Patents

Abstract

The invention discloses a printing fixture. The printing fixture comprises a printing carrier and a printed substrate fastened to the printing carrier. The printing carrier is provided with a plurality of escape grooves and a plurality of cylindrical Vent holes, these escape grooves communicate with these vent holes, a vacuum chamber communicated with the vent holes and a rectangular air suction port communicated with the vacuum chamber are provided on the printed substrate, the vacuum chamber communicates with these vent holes The ventilation holes are connected. The invention also discloses an SMT printing machine. The printing jig of the invention has the advantages of convenient use, high stability and easy fixing.

Description

Printing Fixtures and SMT Printers

technical field

The invention relates to the field of surface mount printing, in particular to a printing fixture for surface mount and an SMT printing machine comprising the same.

Background technique

Surface Mount Technology (SMT), also known as surface mount or surface mount technology, is a method of mounting non-lead or short-lead surface mount components on printed circuit boards by reflow soldering or dip soldering. Surface circuit assembly technology. In the SMT printing process, the printing fixture plays an important role as a device for carrying and fixing the printed circuit board. Traditional printing fixtures mostly use a single top PIN operation, that is, multiple supports are used to drag a printing carrier. Since these supports need to be arranged in advance, there is a defect that it takes a long time to set up the fixture. In addition, the printed carrier boards on these supports are prone to shake, cannot securely fix the printed circuit boards above them, and can only fix one printed circuit board at a time. The guarantee of printing yield only depends on the experience of technicians, so it will inevitably lead to poor solder joints of electronic components after soldering. According to statistics, printing problems caused by top-pin operations account for 60% of the total printing process problems. It is very difficult to maintain a circuit board integrated with a large number of electronic components, so the printed circuit board basically has to be discarded after the problem of poor solder joints occurs, which directly results in an increase in the cost of SMT manufacturing.

Based on the above reasons, it is particularly necessary to research and develop a printing fixture with ease of use, stability and high product yield.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the printing jig in the prior art that it takes a long time to assemble, is prone to shaking and cannot firmly fix the printed circuit board, and provides a convenient, high-stability and easy-to-use Printing jig for fixing printed circuit boards.

The present invention solves the above technical problems through the following technical solutions:

A printing jig, characterized in that the printing jig includes a printing carrier and a printed substrate fastened to the printing carrier, and the printing carrier is provided with a plurality of escape grooves and a plurality of cylindrical Vent holes, these escape grooves communicate with these vent holes, a vacuum chamber communicated with the vent holes and a rectangular air suction port communicated with the vacuum chamber are provided on the printed substrate, the vacuum chamber communicates with these vent holes The ventilation holes are connected.

Preferably, the length and width of each avoidance groove are respectively greater than the length and width of the component area of the printed circuit board on the avoidance groove, and smaller than the length and width of the entire printed circuit board, and the depth of each escape groove is greater than the length and width of the printed circuit board. The maximum height of components on the printed circuit board on the avoidance slot. When designing the length, width and height of the avoidance groove, it should be set accordingly according to the specific structure of the printed circuit board it carries. The avoidance groove should be able to accommodate the component area of the printed circuit board, and make the edge of the printed circuit board adhere to the avoidance groove, while keeping all electronic components in the element area suspended in the avoidance groove.

Preferably, among the avoidance grooves, the avoidance grooves close to the side edges of the printed carrier all have ribs.

Preferably, the material of the printing fixture is metal or epoxy resin.

An SMT printing machine, comprising a controller, a display, a printing chamber and a printing guide rail, is characterized in that the printing fixture also includes the above-mentioned printing fixture and a vacuum suction device.

Preferably, the sum of the heights of the printed substrate and the printed carrier is smaller than the distance between the upper surface of the printed track and the upper surface of the printing chamber. The design of the above dimensions enables the printing fixture to be conveniently transported into the printing chamber through the printing guide rail.

The positive progress effect of the present invention is:

The invention provides a printing fixture. The assembly can be realized by arranging the printing jig in the form of two connecting boards and assembling the printing carrier board on the printed substrate, so it is convenient to use. In addition, these escape grooves can better protect the electronic components on the printed circuit board, and have the advantage of high stability. The structural design in which the avoidance grooves, the air holes, the vacuum chamber and the air suction port are connected in sequence can make the printed circuit board tightly adsorbed on the avoidance groove, which facilitates the fixing of the printed circuit board.

Description of drawings

1 and 2 are perspective views of a printing fixture according to Embodiment 1 of the present invention.

FIG. 3 is a perspective view of a printed substrate according to Embodiment 1 of the present invention.

FIG. 4 is a perspective view of a printed carrier according to Embodiment 1 of the present invention.

FIG. 5 is a perspective view of a printed substrate according to Embodiment 2 of the present invention.

FIG. 6 is a perspective view of a printing carrier according to Embodiment 3 of the present invention.

detailed description

The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

Example 1

As shown in FIGS. 1-4 , the printing fixture A of this embodiment includes a printing carrier 2 , and the printing carrier 2 is provided with a plurality of escape grooves 21 and a plurality of ventilation holes 210 communicating with each escape groove 21 . The length and width of the escape groove 21 are respectively greater than the length and width of the corresponding component area on the printed circuit board, and less than the length and width of the entire printed circuit board, and the depth of the avoidance groove 21 is greater than the corresponding components on the printed circuit board The maximum height of components in the region. Some of the escape slots near the side edges of the print carrier have notches 22 at the side edges of the print carrier.

As shown in Figure 3, the printing fixture A also includes a printed substrate 1 that is firmly connected with the printed carrier 2, and the printed substrate 1 is provided with a vacuum chamber 11 communicated with the air hole 210 and a suction chamber communicated with the vacuum chamber 11. Tuyere 12. 1-2 show the situation that the printed carrier 2 and the printed substrate 1 are fastened by several bolts 3 . When tightening, the screw holes 23 on the printed carrier 2 and the screw holes 13 on the printed substrate 1 are first aligned, and then fastened by bolts 3 and nuts. After being fastened, the printed carrier 2 is located above the printed substrate 1 .

The sum of the heights of the printed substrate 1 and the printed carrier 2 is smaller than the distance between the upper surface of the track of the printing machine and the upper surface of the printing chamber. The material of the printing fixture A can be metal or epoxy resin.

In use, after aligning each component area on the printed circuit board with the escape groove 21 matching the component area, the back of the printed circuit board is placed upward on the upper surface of the printed carrier 2 .

By screwing the printed substrate 1 and the printed carrier 2 , the printing jig A has the advantages of high stability and convenient use. In addition, the printed carrier board 2 is provided with a plurality of avoidance grooves 21, and these avoidance grooves 21 better protect the electronic components on the printed circuit board. The setting of the notch 22 facilitates the placement and removal of the printed circuit board on the printed carrier 2 .

Example 2

The printing fixture in this embodiment and the first embodiment have many identical parts, for example, the vacuum chamber 41 and the suction port 42 , and these identical parts will not be repeated here. As shown in FIG. 6 , the only difference between this embodiment and Embodiment 1 is that the printed substrate and the printed carrier can also be fastened and connected by several screws. At this time, not only the through-type screw holes 43 but also half-through fastening screw holes 44 may be provided on the printed circuit board 4 . In addition, several steps 45 may be provided on the edge of the printed substrate 4 . The setting of these steps 45 makes the bottom plate more convenient when clamping and moving.

Example 3

The printing jig of this embodiment and the embodiment 1 have many identical parts, for example, the screw hole 53 , and these identical parts will not be repeated here. As shown in FIG. 5 , the only difference between this embodiment and Embodiment 1 is that each escape groove 51 near the side edge of the printing carrier 5 has a rib 52 at the side edge of the printing carrier 5 . In addition, some ventilation holes are located on the printed carrier 5 , but do not communicate with the escape groove 51 .

Since there are ribs 52 at the side edges of the escape groove 51 , the airtightness of the printed carrier 5 and the printed circuit board is better and firmer.

This embodiment also provides an SMT printing machine, which includes a controller, a display, a printing chamber, a printing guide rail, a printing jig as described above, and a vacuum suction device. The vacuum suction device is connected with the air suction port, and is used for absorbing and fixing the printed circuit board on the printed carrier board.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (3)

1. a kind of SMT printing machines, including a controller, a display, a printing chamber and a printing guide rail, it is characterised in that The printing machine also includes a printing apparatus and one and inhales vacuum plant；

The printing apparatus include a printing support plate and a printed base plate being connected with the printing carrying plate, the side of printed base plate Edge sets several steps；The printing support plate is provided with multiple escape groove and multiple cylindrical passages, and those escape groove are with being somebody's turn to do A little passages are connected, and the printed base plate is connected provided with a vacuum chamber being connected with the passage and one with the vacuum chamber Rectangle inlet scoop, the vacuum chamber is connected with those passages；The length of each escape groove and wide respectively greater than escape groove On printed circuit board (PCB) component region length and width, and less than whole printed circuit board (PCB) length and width, each escape groove Depth be more than the escape groove on printed circuit board (PCB) component maximum height.

2. SMT printing machines as claimed in claim 1, it is characterised in that the height sum of the printed base plate and the printing support plate Less than the upper surface of the printing guide rail and the distance of the printing chamber upper surface.

3. the SMT printing machines as described in any one in claim 1-2, it is characterised in that the material of the printing apparatus is Metal or epoxy resin.