CN212353219U - Printing platen and vacuum screen printing machine - Google Patents

Abstract

The utility model relates to a printing platen and vacuum silk screen printing machine. The printed bedplate is used for placing a circuit board and comprises a panel for supporting the circuit board, at least three first positioning pieces are arranged on the top surface of the panel, a horizontal plane is determined by the at least three first positioning pieces, the at least three first positioning pieces are used for positioning the circuit board, at least two electrode points with a conductive function are further arranged on the top surface of the panel, and the electrode points can be electrically connected with the circuit board. The vacuum screen printing machine comprises a machine body, the printing bedplate arranged in the machine body and a controller electrically connected with the electrode points. Printing platen and have vacuum silk screen printing machine of this printing platen can improve the degree of automation of vacuum silk screen printing machine.

Description

Printing platen and vacuum screen printing machine

Technical Field

The utility model relates to a PCB printed circuit board makes the field, especially relates to a printing platen and a vacuum silk screen printing machine that has this printing platen.

Background

Chinese patent No. CN201821437500.1 discloses a vacuum screen printing machine, referring to fig. 1, the vacuum screen printing machine includes a frame 1, a vacuum chamber arranged in the frame 1, a vacuum chamber composed of a small vacuum chamber 2 and a main vacuum chamber 3, a vacuum door 4 positioned on the outer wall of the main vacuum chamber 3, and a workbench positioned in the small vacuum chamber 2, a control cabinet 6 and an operation panel 7 communicated with the circuit of the vacuum screen printing machine are arranged beside the small vacuum chamber 2, a small vacuum cover 8 is arranged above the workbench, a cover displacement transmission mechanism for driving the small vacuum cover 8 to move horizontally to open the small vacuum chamber 2 is further arranged on the frame 1, and a platen displacement transmission mechanism for driving the workbench to move from the small vacuum chamber 2 to the main vacuum chamber 3 is arranged in the frame 1.

The operation method of the vacuum screen printing machine with the small vacuum chamber and the main vacuum chamber is similar to that of the vacuum screen printing machine with the small vacuum chamber and the main vacuum chamber generally:

s1, the workbench is positioned in the small vacuum chamber 2, and the cover body displacement transmission mechanism drives the small vacuum cover 8 to move horizontally so as to open the small vacuum chamber 2;

s2, next, placing the printed wiring board on the workbench by the worker, and positioning the printed wiring board by the worker to ensure the relative position of the printed wiring board on the workbench;

s3, after the printed circuit board is placed in place, the cover body displacement transmission mechanism drives the small vacuum cover 8 to move horizontally to seal the small vacuum chamber 2, then the platen displacement transmission mechanism drives the workbench to move horizontally, the printed circuit board is moved into the main vacuum chamber 3, and printing is started in the main vacuum chamber 3.

Specifically, refer to chinese patent No. CN201510534760.5, a resin ink vacuum hole plugging printing apparatus and a printing method thereof.

However, the vacuum screen printing machine needs to manually position the printed circuit board, and the degree of automation still needs to be improved.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model aims at providing a printing platen and a vacuum silk screen printing machine that has this printing platen, the two degree of automation that can improve vacuum silk screen printing machine.

A printed bedplate for placing a circuit board comprises a panel for supporting the circuit board, wherein the top surface of the panel is provided with at least three first positioning pieces, the at least three first positioning pieces determine a horizontal plane, the at least three first positioning pieces are used for positioning the circuit board, the top surface of the panel is also provided with at least two electrode points with a conductive function, and the electrode points can be electrically connected with the circuit board.

Compared with the prior art, the printing platen utilize at least three first locating piece to insert in the hole of circuit board, realize the location of circuit board. After the circuit board is positioned, if the circuit board is placed in place, the circuit board is in physical contact with the electrode points, and at least two electrode points are electrically conducted through the circuit board, so that whether the circuit board is placed in place or not is judged, and the automation degree of the vacuum screen printing machine is improved.

Further, a straight line defined by the two electrode points intersects the length and width of the circuit board, respectively.

Furthermore, the two electrode points are respectively arranged in two areas of the panel corresponding to the opposite corners of the circuit board.

Furthermore, the top surface of panel is provided with four electrode points, four electrode points set up respectively the panel corresponds in four regions of circuit board four corners department.

Furthermore, the top surface of the panel is provided with four first positioning pieces, and the four first positioning pieces are respectively arranged in four areas of the panel corresponding to four corners of the circuit board.

Further, one first positioning member is provided at one side of each of the electrode points, and the perpendicular distance between the center of the electrode point and the center line of the provided first positioning member is less than 5 cm.

Furthermore, a conductive wire with a conductive function is further arranged on the panel, and one end of the conductive wire is electrically connected with the electrode point.

Further, detachably be provided with the base member on the top surface of panel, the top surface of base member is provided with first locating piece the electrode point, the electrode point is located the week side of first locating piece.

Further, the conductive line is disposed on a bottom surface of the base.

Further, the top surface or the bottom surface of the base body is provided with a groove, and the groove extends from the electrode point to the edge of the base body.

Further, the diameter of the first positioning member gradually increases from the top to the bottom thereof.

Further, the first positioning member may have any one of a spherical shape, a conical shape, a needle shape, a hemispherical shape, and a bar shape having a hemispherical top.

Further, a through hole is formed in the panel.

Furthermore, a second positioning piece is arranged on the bottom surface of the base body and inserted into the through hole of the panel.

Further, the axis of the second positioning piece and the axis of the first positioning piece are located on the same straight line.

Further, the diameter of the second positioning part gradually increases from the bottom to the top of the second positioning part.

Further, the shape of the second positioning member is any one of a sphere, a cone, a needle, a hemisphere, and a bar shape having a hemispherical top.

Furthermore, the bottom surface of the base body is provided with an adhesive layer, and the adhesive layer is positioned between the panel and the base body.

A vacuum screen printing machine comprises a machine body, the printing bedplate arranged in the machine body and a controller electrically connected with electrode points.

Compared with the prior art, after the vacuum screen printing machine adopts the printing platen, the positioning of the circuit board is realized by utilizing at least three first positioning pieces to insert into holes of the circuit board. After the circuit board is positioned, if the circuit board is placed in place, the circuit board is in physical contact with the electrode points, and at least two electrode points are electrically conducted through the circuit board, so that whether the circuit board is placed in place or not is judged, and the automation degree of the vacuum screen printing machine is improved.

Further, the controller is a PLC controller.

Further, the vacuum screen printing machine further comprises a manipulator, and the manipulator is used for carrying the circuit board into the machine body or out of the machine body.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a vacuum screen printing machine in the background art;

FIG. 2 is a schematic structural view of a printing platen according to an embodiment;

FIG. 3 is a first structural schematic view of a first positioning member according to an embodiment;

FIG. 4 is a second structural view of the first positioning element according to the first embodiment;

FIG. 5 is a third structural view of the first positioning element according to the first embodiment;

FIG. 6 is a fourth structural view of the first positioning element according to the first embodiment;

FIG. 7 is a fifth structural view of the first positioning element according to the first embodiment;

fig. 8 is a schematic structural diagram of a vacuum screen printing machine according to the first embodiment;

FIG. 9 is a schematic diagram of the connection of the controller according to the first embodiment;

fig. 10 is a schematic structural view of a printing platen according to the second embodiment;

fig. 11 is a schematic structural view of a vacuum screen printing machine according to a second embodiment;

FIG. 12 is a schematic connection diagram of the controller according to the second embodiment;

fig. 13 is a schematic structural view of a printing platen according to the third embodiment;

FIG. 14 is a first structural schematic view of a first positioning member according to a third embodiment;

FIG. 15 is a second structural view of the first positioning member according to the third embodiment;

FIG. 16 is a third structural view of the first positioning member according to the third embodiment;

FIG. 17 is a fourth structural view of the first positioning member according to the third embodiment;

FIG. 18 is a fifth construction of a first positioning member in accordance with the third embodiment;

fig. 19 is a schematic structural diagram of a vacuum screen printing machine according to a third embodiment;

FIG. 20 is a first structural schematic view of a first positioning member according to the fourth embodiment;

FIG. 21 is a second structural view of the first positioning member according to the fourth embodiment;

FIG. 22 is a third structural view of the first positioning member in accordance with the fourth embodiment;

FIG. 23 is a fourth schematic view of a first retainer in accordance with a fourth embodiment;

FIG. 24 is a fifth construction of a first positioning member in accordance with the fourth embodiment;

FIG. 25 is a schematic structural view of a first positioning member according to a fifth embodiment;

FIG. 26 is a schematic structural view of a first positioning member according to a sixth embodiment;

reference numerals:

1. a frame; 2. a small vacuum chamber; 3. a main vacuum chamber; 4. a vacuum door; 6. a control cabinet; 7. an operation panel; 8. a small vacuum cover;

10. a body; 20. a printing platen; 21. a panel; 22. a first positioning member; 23. an electrode point; 24. a conductive wire; 25. a substrate; 26. a bonding layer; 27. a second positioning member; 28. a groove; 30. a manipulator; 40. a controller; 50. a circuit board.

Detailed Description

Example one

A printing platen 20 for supporting a circuit board 50, see fig. 2, comprises a face plate 21 for supporting the circuit board 50. At least three first positioning members 22 are arranged on the top surface of the panel 21, each first positioning member 22 corresponds to a through hole on the circuit board 50, and the distribution of the at least three first positioning members 22 on the top surface of the panel 21 is enough to determine a horizontal plane, that is, if three first positioning members 22 are adopted, the three first positioning members 22 are not on the same straight line, and the three first positioning members 22 form a triangle on the top surface of the panel 21. At least two electrode points 23 with a conductive function are further disposed on the top surface of the panel 21, each electrode point 23 is located in an orthographic projection area of the circuit board 50 on the top surface of the panel 21, when the circuit board 50 is placed on the panel 21, the circuit board 50 can be in physical contact with the electrode point 23, so that the electrode point 23 is electrically connected with the circuit board 50, and the two electrode points 23 are electrically connected with the circuit board 50. In the present embodiment, three first positioning members 22 and two electrode points 23 are disposed on the top surface of the panel 21.

Referring to fig. 2, it is further optimized that, in order to fully utilize the space of the circuit board 50, the three first positioning members 22 respectively correspond to any of the four corners of the circuit board 50, i.e., when the circuit board 50 is placed on the panel 21, the three first positioning members 22 are respectively located at the four corners of the circuit board 50. More preferably, the centers of the three first positioning members 22 are located on the diagonal of the circuit board 50; of course, the three first positioning members 22 may be disposed at four sides of the circuit board 50 as long as the three first positioning members 22 form a triangle on the panel 21.

Referring to fig. 2, further optimization is performed to improve the detection accuracy of the printed board 20 for detecting whether the circuit board 50 is placed in place, the straight lines defined by the two electrode points 23 respectively intersect with the length and the width of the circuit board 50, i.e. the straight lines defined by the two electrode points 23 are neither parallel to the long side of the circuit board 50 nor parallel to the wide side of the circuit board 50. Preferably, the two electrode points 23 are respectively disposed in two regions of the panel 21 corresponding to opposite corners of the circuit board 50, that is, when the circuit board 50 is placed on the panel 21, two electrode points 23 are respectively disposed at any two non-adjacent corners of the circuit board 50.

Referring to fig. 2, in order to further improve the accuracy of detecting whether the circuit board 50 is placed in position by the printing platen 20, a first positioning member 22 is provided at one side of each electrode point 23, and the perpendicular distance between the center of the electrode point 23 and the center line of the provided first positioning member 22 is less than 5cm, that is, in the present embodiment, one of the electrode points 23 and one of the first positioning members 22 are respectively provided at any two non-adjacent corners of the circuit board 50, and the perpendicular distance between the center of the electrode point 23 and the center line of the corresponding first positioning member 22 is less than 5cm, and the third first positioning member 22 is provided at the other corners of the circuit board 50.

Referring to fig. 2, in order to facilitate connection with the control system of the vacuum screen printing machine, a conductive wire 24 having a conductive function is further disposed on the panel 21, one end of the conductive wire 24 is electrically connected to the electrode point 23, and the other end of the conductive wire 24 is electrically connected to the control system of the vacuum screen printing machine. In the present embodiment, the panel 21 is provided with two conductive lines 24, each conductive line 24 connecting one electrode point 23.

Referring to fig. 3 to 7, in order to reduce the difficulty of picking and placing the circuit board 50 by the robot 30, the axis of the first positioning member 22 is perpendicular to the top surface of the panel 21, and the diameter of the first positioning member 22 gradually increases from the top to the bottom thereof, for example, the shape of the first positioning member 22 may be any one of a sphere, a cone, a needle, a hemisphere, and a rod with a hemispherical top, and in the embodiment, the shape of the first positioning member 22 is a needle.

A vacuum screen printing machine, see fig. 8 and 9, which comprises a machine body 10, the printing platen 20, a manipulator 30 and a controller 40. Wherein the body 10 is used for the printed circuit board 50. A printing platen 20 is provided in the body 10, the printing platen 20 being for supporting a circuit board 50. The robot 30 is disposed at one side of the body 10, and the robot 30 is used to transport the circuit board 50 into the body 10 or out of the body 10. A port of the controller 40 is connected to the conductive line 24 of the printing platen 20, and in this embodiment, the controller 40 is a PLC controller 40, and two ports of the PLC controller 40 are connected to the two conductive lines 24 of the printing platen 20, respectively.

The working process is as follows: the manipulator 30 sucks the circuit board 50 and places the circuit board 50 on the printing platen 20, during which the holes of the circuit board 50 correspond to the first positioning pieces 22 one by one, and the circuit board 50 slides to the top surface of the panel 21 along the first positioning pieces 22; when the circuit board 50 connects the electrode points 23 at the opposite corners, the PLC controller 40 determines that the circuit board 50 is placed in place, and the PLC controller 40 controls the body 10 to perform the printing work on the circuit board 50.

Compared with the prior art, the printing platen 20 of this embodiment is the setting element that the head is the gradual change nature through the setting element change with the cylinder of original location nail, utilizes the bottom or the big designs such as hole of middle part and circuit board 50 of setting element to ensure positioning accuracy, simultaneously because the top of setting element designs slightly for a short time, so can reduce the precision of placing the in-process effectively, and then has reduced the degree of difficulty of getting and putting at the in-process of getting and putting circuit board 50, has greatly improved the efficiency of production. In addition, whether four points are placed in place or not needs to be confirmed in the original placing process, and only two points at opposite angles need to be confirmed to be placed in place after the design is changed, so that the production efficiency is greatly improved.

Example two

A printing platen 20, see fig. 10, which differs from the printing platen 20 of the first embodiment in that: the panel 21 is provided with four first positioning members 22, four electrode points 23 and four conductive wires 24, the four first positioning members 22 respectively correspond to four corners of the circuit board 50, namely when the circuit board 50 is placed on the panel 21, the four first positioning members 22 are respectively positioned at the four corners of the circuit board 50, the peripheral side of each first positioning member 22 is provided with one electrode point 23, the vertical distance between the center of the electrode point 23 and the central line of the corresponding first positioning member 22 is less than 5cm, and each electrode point 23 is connected with one conductive wire 24; more preferably, the centers of the four first positioning members 22 are located on the diagonal line of the circuit board 50, and the connecting line of the centers of two adjacent first positioning members 22 is parallel to the long side or the wide side of the circuit board 50; of course, the four first positioning members 22 may also be disposed at four sides of the circuit board 50 as long as the four first positioning members 22 may define one horizontal plane.

A vacuum screen printing machine, see fig. 11 and 12, which is different from the vacuum screen printing machine of the first embodiment in that: the printing platen 20 according to the second embodiment is adopted, the printing platen 20 according to the first embodiment is not adopted, and four ports of the PLC controller 40 are respectively connected with the four conductive wires 24 of the printing platen 20; when the circuit board 50 connects the diagonal electrode points 23 or at least three electrode points 23, the PLC controller 40 determines that the circuit board 50 is placed in place, and the PLC controller 40 controls the body 10 to perform printing work on the circuit board 50.

Compared with the prior art, the printing platen 20 of this embodiment is the setting element that the head is the gradual change nature through the setting element change with the cylinder of original location nail, utilizes the bottom or the big designs such as hole of middle part and circuit board 50 of setting element to ensure positioning accuracy, simultaneously because the top of setting element designs slightly for a short time, so can reduce the precision of placing the in-process effectively, and then has reduced the degree of difficulty of getting and putting at the in-process of getting and putting circuit board 50, has greatly improved the efficiency of production. In addition, whether four points are placed in place or not needs to be confirmed in the original placing process, and only two points or at least three points of opposite angles need to be confirmed to be placed in place after the design is changed, so that the production efficiency is greatly improved. In actual tests of the applicant at present, the original method needs 8 to 10 seconds for placing the circuit board 50, while the vacuum screen printer described in this embodiment needs 5 seconds for placing the circuit board 50.

EXAMPLE III

A printing platen 20, see fig. 13, for supporting a circuit board 50 includes a face plate 21 with at least three PIN locator PINs disposed on a top surface of the face plate 21. The PIN locating peg includes a base 25 of planar construction. The first positioning member 22 and the electrode points 23 having a conductive function are provided on the top surface of the base 25, the adhesive layer 26 is provided on the bottom surface of the base 25, and the conductive wires 24 are further provided on the base 25. The first positioning element 22 is used for being inserted into a hole of the circuit board 50 to realize positioning and alignment of the circuit board 50. The electrode points 23 are located on the peripheral side of the first positioning member 22, and the electrode points 23 are located in a circular area having a diameter of 5cm with the axis of the first positioning member 22 as the center. The sticking layer 26 is used for sticking the PIN positioning nails on an air guide bottom plate of the vacuum screen printing machine. One end of the conductive wire 24 is connected with the electrode point 23, and the other end of the conductive wire 24 is used for connecting with a controller 40 of the vacuum screen printing machine, so as to realize the electrical connection between the electrode point 23 and the controller 40.

Referring to fig. 14 to 18, the axis of the first positioning member 22 is perpendicular to the top surface of the base 25, and the diameter of the first positioning member 22 gradually increases from the top to the bottom thereof, for example, the shape of the first positioning member 22 may be any one of a spherical shape, a conical shape, a needle shape, a hemispherical shape, and a rod shape having a hemispherical top.

In addition, the conductive line 24 is disposed on the top surface of the base 25, the thickness of the conductive line 24 is smaller than the height of the portion of the electrode point 23 protruding from the substrate, and in the present embodiment, the adhesive layer 26 is a double-sided adhesive tape.

As to the specific positions of the first positioning element 22 and the electrode points 23 on the panel 21, please refer to the distribution of the first positioning element 22 and the electrode points 23 on the printing platen 20 described in the first embodiment or the second embodiment, which will not be discussed herein.

A vacuum screen printing machine, see fig. 19, which comprises a machine body 10, the printing platen 20, a manipulator 30 and a controller 40. Wherein the body 10 is used for the printed circuit board 50. A printing platen 20 is provided in the body 10, the printing platen 20 being for supporting a circuit board 50. The robot 30 is disposed at one side of the body 10, and the robot 30 is used to transport the circuit board 50 into the body 10 or out of the body 10. The ports of the controller 40 are connected to the conductive lines 24 of the printing platen 20, and in this embodiment, the controller 40 is a PLC controller 40, and the ports of the PLC controller 40 are connected to the conductive lines 24 of the printing platen 20, respectively.

As for the specific connection manner of the PLC controller 40, please refer to the vacuum screen printing machine described in the first embodiment or the second embodiment, which will not be discussed herein.

The working process is as follows: firstly, adhering a PIN locating nail on the panel 21, and connecting a conducting wire 24 into a port of the PLC 40; then, the robot 30 sucks the circuit board 50 and places the circuit board 50 on the printing platen 20, during which the holes of the circuit board 50 correspond to the first positioning members 22 one by one, and the circuit board 50 slides to the top surface of the panel 21 along the first positioning members 22; finally, when the circuit board 50 connects the electrode points 23 at the opposite corners, the PLC controller 40 determines that the circuit board 50 is placed in place, and the PLC controller 40 controls the body 10 to perform the printing work on the circuit board 50.

Compared with the prior art, the printing platen 20 of the present embodiment combines the first positioning element 22 and the electrode points 23 into one assembly, and the assembly is detachably mounted on the panel 21, so that the positions of the positioning element and the electrode points 23 can be changed according to the size of the circuit board 50 to adapt to different circuit boards 50. In addition, PIN location nail is through changing the setting element of the cylinder of original location nail into the setting element that the head is the gradual change nature, utilizes the bottom or the big designs such as middle part and the hole of circuit board 50 of setting element to ensure positioning accuracy, simultaneously because the top of setting element designs for a short time, so can reduce the precision of placing the in-process effectively, and then has reduced the degree of difficulty of getting and putting at the in-process of getting and putting circuit board 50, has greatly improved the efficiency of production. In addition, whether four points are placed in place or not needs to be confirmed in the original placing process, and only two points or at least three points of opposite angles need to be confirmed to be placed in place after the design is changed, so that the production efficiency is greatly improved. In actual tests of the applicant at present, the original method needs 8 to 10 seconds for placing the circuit board 50, while the vacuum screen printer described in this embodiment needs 5 seconds for placing the circuit board 50.

Example four

A printing platen 20, see fig. 20 to 24, which differs from the printing platen 20 described in the third embodiment in that: a second positioning member 27 is further provided on the bottom surface of the base 25, the second positioning member 27 being adapted to be inserted into a hole in the face plate 21 to determine the position of the PIN positioning PIN on the face plate 21; further, the axis of the second positioning member 27 is perpendicular to the bottom surface of the base 25, the axis of the second positioning member 27 is aligned with the axis of the first positioning member 22, the diameter of the second positioning member 27 gradually increases from the bottom to the top thereof, and for example, the shape of the second positioning member 27 may be any one of a spherical shape, a conical shape, a needle shape, a semispherical shape, and a bar shape with a semispherical top.

A vacuum silk screen printing machine, its difference with the vacuum silk screen printing machine of embodiment third lies in: using the printing platen 20 described in example three.

EXAMPLE five

A printing platen 20, see fig. 25, which differs from the printing platen 20 described in the third or fourth embodiment in that: in order to place the conductive wire 24, a groove 28 is arranged on the top surface of the base body 25, the groove 28 extends from the electrode point 23 to the edge of the base body 25, and the height of the part of the conductive wire 24 protruding out of the substrate is less than that of the part of the electrode point 23 protruding out of the substrate; after the PIN locating nail described in this embodiment is adhered to the air guide bottom plate of the vacuum screen printing machine, the conductive wire 24 is placed in the groove 28, and the conductive wire 24 is pulled out of the base 25 from the groove 28.

A vacuum screen printing machine, which is different from the vacuum screen printing machine described in the third or fourth embodiment in that: using the printing platen 20 described in example five.

EXAMPLE six

A printing platen 20, see fig. 26, which differs from the printing platen 20 described in the third or fourth embodiment in that: in order to place the conductive wire 24, a groove 28 is arranged on the top surface of the base body 25, the groove 28 extends from the electrode point 23 to the edge of the base body 25, and the height of the part of the conductive wire 24 protruding out of the substrate is less than that of the part of the electrode point 23 protruding out of the substrate; after the PIN locating nail described in this embodiment is adhered to the air guide bottom plate of the vacuum screen printing machine, the conductive wire 24 is placed in the groove 28, and the conductive wire 24 is pulled out of the base 25 from the groove 28.

A vacuum screen printing machine, which is different from the vacuum screen printing machine described in the third or fourth embodiment in that: using the printing platen 20 described in example six.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims (14)

1. A printing platen for holding a circuit board, comprising:

it is including being used for supporting panel (21) of circuit board (50), the top surface of panel (21) is provided with at least three first locating piece (22), a horizontal plane is confirmed in at least three first locating piece (22), at least three first locating piece (22) are used for the location of circuit board (50), the top surface of panel (21) still is provided with at least two electrode point (23) that have electrically conductive function, electrode point (23) can with circuit board (50) electricity is connected.

2. A printing platen according to claim 1, wherein: the straight line determined by the two electrode points (23) intersects the length and width of the circuit board (50) respectively.

3. A printing platen according to claim 2, wherein: the two electrode points (23) are respectively arranged in two areas of the panel (21) corresponding to the opposite corners of the circuit board (50).

4. A printing platen according to claim 3, wherein: the top surface of panel (21) is provided with four electrode points (23), four electrode points (23) set up respectively panel (21) correspond in four regions of circuit board (50) four corners department.

5. A printing platen according to claim 4, wherein: the top surface of panel (21) is provided with four first locating piece (22), four first locating piece (22) set up respectively panel (21) correspond in four regions of circuit board (50) four corners department.

6. A printing platen according to any one of claims 1 to 5, wherein: one first positioning piece (22) is arranged on one side of each electrode point (23), and the perpendicular distance between the center of the electrode point (23) and the central line of the arranged first positioning piece (22) is less than 5 cm.

7. A printing platen according to any one of claims 1 to 5, wherein: the panel (21) is further provided with a conductive wire (24) with a conductive function, and one end of the conductive wire (24) is electrically connected with the electrode point (23).

8. A printing platen according to claim 7, wherein: detachably be provided with base member (25) on the top surface of panel (21), the top surface of base member (25) is provided with first locating piece (22) electrode point (23), electrode point (23) are located the week side of first locating piece (22).

9. A printing platen according to claim 8, wherein:

the conductive wire (24) is arranged on the bottom surface of the substrate (25);

the top surface or the bottom surface of base member (25) is provided with recess (28), recess (28) extend to the edge of base member (25) from electrode point (23).

10. A printing platen according to claim 8, wherein: the diameter of the first positioning member (22) gradually increases from the top to the bottom thereof.

11. A printing platen according to claim 10, wherein: the shape of the first positioning member (22) is any one of a sphere, a cone, a needle, a hemisphere, and a bar shape having a hemisphere top.

12. A printing platen according to any one of claims 8 to 11, wherein:

the panel (21) is provided with a through hole;

a second positioning piece (27) is arranged on the bottom surface of the base body (25), and the second positioning piece (27) is inserted into the through hole of the panel (21);

the axis of the second positioning part (27) and the axis of the first positioning part (22) are positioned on the same straight line;

the diameter of the second positioning piece (27) is gradually increased from the bottom to the top thereof;

the shape of the second positioning piece (27) is any one of spherical, conical, needle-shaped, hemispherical and bar-shaped with a hemispherical top;

the bottom surface of the base body (25) is provided with an adhesive layer (26), and the adhesive layer (26) is positioned between the panel (21) and the base body (25).

13. The utility model provides a vacuum silk screen printing machine which characterized in that: comprising a body (10), a printing platen (20) according to any one of claims 1 to 12 arranged in said body (10), and a controller (40) electrically connected to said electrode points (23).

14. The vacuum screen printing machine of claim 13, wherein:

the controller (40) is a PLC (programmable logic controller) 40;

the vacuum screen printing machine further comprises a manipulator (30), and the manipulator (30) is used for carrying the circuit board (50) into the machine body (10) or carrying the circuit board out of the machine body (10).

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