CN114193121B

CN114193121B - Electromagnetic interference prevention press-fitting system and control method

Info

Publication number: CN114193121B
Application number: CN202210002476.3A
Authority: CN
Inventors: 李圣华
Original assignee: Anhui Jdi New Energy Technology Co ltd
Current assignee: Anhui Jdi New Energy Technology Co ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2023-10-27
Anticipated expiration: 2042-01-04
Also published as: CN114193121A

Abstract

The invention relates to an electromagnetic interference prevention press-fitting system, which comprises a base, two conveying devices, an adsorption device, a moving device, a fixing device and a control system, wherein the base is provided with a plurality of fixing devices; the two conveying devices are symmetrically arranged above the base, and each conveying device comprises a mounting plate, a first conveying belt, a second conveying belt and a position sensor; the fixing device is arranged between the two conveying devices and is matched with the circuit board; the moving device comprises an X-axis moving structure, a Y-axis moving structure and a Z-axis moving structure; the adsorption device comprises a first negative pressure device, an adsorption table, a plurality of first adsorption holes, a plurality of first limit grooves and a plurality of infrared sensors; the control system is connected with the conveying device, the adsorption device, the moving device and the fixing device. The invention solves the technical problem of how to improve the press-fitting efficiency of the shielding cover by arranging the moving device and the adsorption device.

Description

Electromagnetic interference prevention press-fitting system and control method

Technical Field

The invention relates to the field of press-fitting systems, in particular to an electromagnetic interference prevention press-fitting system and a control method.

Background

A shield is a tool used to shield electronic signals. The effect is to shield the influence of external electromagnetic wave to the internal circuit and the electromagnetic wave generated inside from radiating outwards. The shield is typically mounted by first securing a shield frame or shield clip to the circuit board and then manually press-fitting the corresponding shield to the shield frame or shield clip. The height of the shield is typically higher than the highest component on the circuit board.

In the prior art, the shielding cover is generally pressed and installed manually, so that the labor intensity is high, the efficiency is low, the manual pressing force can not be controlled, and the circuit board is easy to damage. Therefore, there is a need for an electromagnetic interference resistant press-fit system.

Disclosure of Invention

The invention provides an electromagnetic interference prevention press-fitting system and a control method, which aim to solve the technical problem of how to improve the press-fitting efficiency of a shielding cover.

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

an electromagnetic interference prevention press-fitting system comprises a base, two conveying devices, an adsorption device, a moving device, a fixing device, a control system and a display; the two conveying devices are symmetrically arranged above the base, and each conveying device comprises a mounting plate, a first conveying belt, a second conveying belt and a position sensor; the two mounting plates are arranged above the base in parallel; the first conveying belts are respectively arranged on the inner sides of the mounting plates, at least two first conveying rollers are arranged in the first conveying belts, and the first conveying rollers are connected with the bearings of the mounting plates; the second conveying belt is arranged on the inner sides of the two mounting plates and matched with the first conveying belt, at least two second conveying rollers are arranged in the second conveying belt, and the second conveying rollers are connected with the mounting plates; the fixing device is arranged between the two conveying devices and is matched with the circuit board; the moving device comprises an X-axis moving structure, a Y-axis moving structure and a Z-axis moving structure; the X-axis moving structure is arranged above the conveying device and comprises a first moving table; the Y-axis moving structure is arranged on the first moving platform and comprises a second moving platform; the Z-axis moving structure comprises a lifting cylinder, the lifting cylinder is arranged on the second moving table, and the lifting cylinder is positioned above the circuit board; the adsorption device comprises a first negative pressure device, an adsorption table, a plurality of first adsorption holes, a plurality of first limit grooves and a plurality of infrared sensors; the adsorption table is transversely arranged below the lifting cylinder, connected with the telescopic end of the lifting cylinder and matched with the circuit board; the first limit groove is a groove and is arranged on the bottom surface of the adsorption table and is respectively matched with the shapes of the shielding cases, a first detection layer is arranged on the inner side surface of the first limit groove, and the first detection layer is an elastic rubber layer; the first adsorption holes are respectively arranged on the inner top surfaces of the first limit grooves; the infrared sensors are respectively arranged on the top surfaces inside the first limit grooves; the first negative pressure device is communicated with a plurality of first adsorption holes; the control system is connected with the conveying device, the adsorption device, the moving device, the fixing device and the display. The X-axis moving structure and the Y-axis moving structure are screw-driven moving structures. If the circuit board needs to be pressed with a plurality of shielding cases, all shielding cases can be adsorbed into the first limiting groove, and meanwhile the circuit board is pressed without repeated reciprocating, so that the working efficiency is improved. The second conveyer belt is matched with the first conveyer belt to convey the circuit board. The fixing device is matched with the circuit board to fix the circuit board. The adsorption table is matched with the circuit board to realize the press fitting of the shielding cover.

The shielding cover to be pressed on the top surface of the circuit board is adsorbed into the corresponding first limit groove through negative pressure at the feeding position of the external shielding cover by controlling the adsorption table through the moving device. Then place the circuit board on two first conveyer belts, start first conveyer belt and second conveyer belt, when the circuit board carried the absorption platform below, by the position sensor sensing, then control fixing device and fix the circuit board, then make the absorption platform descend through the lift cylinder, make the shield cover pressure equipment to the shielding frame on, then stop first negative pressure ware, make the shield cover separate with first absorption hole, then rise through lift cylinder control absorption platform, later control first conveyer belt and second conveyer belt output the circuit board. The adjacent first conveying roller and second conveying roller are used for supporting the circuit board. Because the machining precision of the shielding frame or the shielding cover is insufficient, the pressing assembly is not tight and the shielding frame or the shielding cover is easy to fall off. The first detection layer is used for detecting whether the shielding case is not tight in press fitting or not, preventing the shielding case from falling off in the subsequent process, if the press fitting is not tight, when the adsorption table ascends, the shielding case can ascend under the friction force action of the rubber layer, the infrared sensor can sense the position change of the shielding case, the shielding case and the circuit board which are not tight in press fitting are marked by the infrared sensor, warning information is sent through the display, and workers can press the related circuit board manually. By varying the elasticity of the first detection layer, the detection criterion can be adjusted. An infrared sensor is provided for alignment at the time of adsorption.

Further, the adsorption device comprises a fixed plate, a first side plate, a second side plate, a turnover motor, a second negative pressure device, a plurality of second adsorption holes, a plurality of second limit grooves and a turnover shaft; the fixed plate is fixed at the telescopic end of the lifting cylinder; the first side plate is fixed at the lower part of the fixed plate and is positioned at one side of the adsorption table and between the two conveying devices; the second side plates are arranged below the fixed plates and are positioned on two sides of the adsorption table, the second side plates are arranged opposite to the first side plates, the upper parts of the second side plates are connected with rotating shafts of the fixed plates, the rotating shafts of the second side plates are connected with rotating motors, and the inner side surfaces of the second side plates are provided with turnover grooves; the turnover motor is fixed on the outer side surface of the first side plate, a rotating shaft of the turnover motor penetrates through the first side plate and is fixed with the center of the side surface of the adsorption table, and the rotating shaft of the turnover motor is arranged along the conveying direction of the conveying device; the turnover shaft is rod-shaped, is fixed on the side surface of the adsorption table, has the axis coincident with the rotation axis of the turnover motor and is matched with the turnover groove; the second limiting grooves are arranged on the top surface of the adsorption table and are respectively matched with the shapes of the shielding cases, and a second detection layer is arranged on the inner side surface of each second limiting groove and is an elastic rubber layer; the second adsorption holes are respectively arranged on the inner bottom surfaces of the second limit grooves; the infrared sensors are respectively arranged on the inner bottom surfaces of the second limit grooves; the second negative pressure device is communicated with a plurality of second adsorption holes. The turnover shaft is matched with the turnover groove and can be mutually separated, and the turnover shaft can rotate in the turnover groove.

For circuit boards with components mounted on both sides, it may be the case that a press-like shield is required on both sides of the circuit board. When the adsorption table presses the shielding cover onto the circuit board, the first negative pressure device is not stopped, the fixing device is controlled to be released, then the adsorption table is controlled to drive the circuit board to ascend, then the adsorption table is controlled to rotate 180 degrees through the overturning motor, then the adsorption table is controlled to descend, the circuit board falls onto the conveying belt, the bottom surface of the circuit board faces upwards, the fixing device is controlled to fix the circuit board, then the first negative pressure device is stopped, then the adsorption table is controlled to descend, the adsorption table is separated from the circuit board, then the second side plate is rotated through the rotating motor, the second side plate is separated from the adsorption table, then the adsorption table is moved along the conveying direction of the conveying device through the moving device, when the adsorption table is moved to the outer side of the circuit board, the adsorption table is controlled to ascend, then the rotating motor is controlled to rotate, and the second side plate is connected with the adsorption table. And then controlling the adsorption platform to adsorb the shielding cover needed by the bottom surface of the circuit board into the second limit groove, and press-fitting the shielding cover onto the bottom surface of the circuit board.

Further, the adsorption device comprises a first communication cavity, a second communication cavity, a first sealing plate, a second sealing plate, a first air cylinder and a second air cylinder; the first communication cavity is transversely arranged in the adsorption table; a first cylinder is arranged in the first communication cavity and is arranged along the conveying direction of the conveying device; the first sealing plate is arranged in the first communication cavity, is tightly matched with the first communication cavity and is fixed with the telescopic end of the first cylinder; the upper ports of the first adsorption holes are arranged on the inner bottom surface of the first communication cavity at intervals along the axial direction of the first cylinder and are tightly matched with the first sealing plate; the first negative pressure device is communicated with one side, close to the first cylinder, of the first communication cavity through a hose; the second communication cavity is transversely arranged in the adsorption table and is positioned above the first communication cavity; a second cylinder is arranged in the second communication cavity and is arranged along the conveying direction of the conveying device; the second sealing plate is arranged in the second communication cavity, is tightly matched with the second communication cavity and is fixed with the telescopic end of the second cylinder; the lower ports of the second adsorption holes are arranged on the inner top surface of the second communication cavity at intervals along the axial direction of the second cylinder and are tightly matched with the second sealing plate; the second negative pressure device is communicated with one side, close to the second cylinder, of the second communication cavity through a hose. The first sealing plate is tightly matched with the first communication cavity to prevent air leakage. The upper ports of the plurality of first adsorption holes are tightly matched with the first sealing plate and are arranged according to the adsorption sequence of the first limiting grooves.

When a plurality of shielding cases are adsorbed into the limit groove, the shielding cases are required to be adsorbed in sequence. The first cylinder is controlled to stretch, so that the first sealing plate moves, a plurality of first adsorption holes are sequentially communicated with the first negative pressure device, and the shielding cover is sequentially adsorbed. The adsorption process of the second adsorption hole is the same.

Further, the adsorption device comprises a first matching groove, a second matching groove, at least two first supporting blocks and at least two second supporting blocks; the direction of the first communication cavity facing the first side plate is an opening, and the opening of the first communication cavity is far away from the first cylinder; the first matching groove is arranged on the inner side surface of the first side plate and matched with the first sealing plate; the direction of the first side plate of the second communication cavity surface is an opening, and the opening is far away from the second cylinder; the second matching groove is arranged on the inner side surface of the first side plate and matched with the second sealing plate, and the second matching groove and the first matching groove are symmetrical with the center of the rotation axis of the turnover motor; the two first supporting blocks are made of rubber materials and are fixed on the bottom surface of the adsorption table to be matched with the circuit board; the two second supporting blocks are made of rubber materials and are fixed on the top surface of the adsorption table to be matched with the circuit board. The two first supporting blocks are matched with the circuit board, so that the shielding cover is just pressed on the shielding frame.

Since the adsorption table is rotatable, swing occurs at the time of press-fitting and moving. The first cylinder and the second cylinder are controlled to extend, so that the first sealing plate and the second sealing plate enter the first matching groove and the second matching groove to realize fixation. The first supporting block and the second supporting block are arranged and are used for being abutted against the first limiting plate and the second limiting plate, limiting the distance between the adsorption table and the circuit board and preventing damage to the circuit board caused by overlarge force. The second matching groove and the first matching groove are centered and symmetrical with the rotation axis of the turnover motor, and are used for fixing the sealing plate and the matching groove with each other after the adsorption table rotates. The first supporting block and the second supporting block are arranged and can be adjusted according to different heights of the shielding cases.

Further, the adsorption device comprises an upper positioning plate, a lower positioning plate, a first anti-rotation cylinder, a second anti-rotation cylinder, a plurality of anti-rotation rods, a moving plate and a driving motor; a first chute is transversely arranged on the inner measuring surface of the first side plate and is positioned at one side of the rotation axis of the adsorption table; the upper positioning plate is arranged in the first chute, is connected with the upper surface of the adsorption table and is matched with the rotation of the adsorption table, and a rubber layer is arranged on the lower surface of the upper positioning plate; the first anti-rotation cylinder is arranged in the first chute, and the telescopic end of the first anti-rotation cylinder is fixed with the upper positioning plate; a second chute is transversely arranged on the inner measuring surface of the first side plate, and the second chute is positioned at one side of the rotation axis of the adsorption table and is positioned below the first chute; the lower locating plate is arranged in the second chute, is connected with the lower surface of the adsorption table and is matched with the rotation of the adsorption table, and a rubber layer is arranged on the upper surface of the lower locating plate; the second anti-rotation cylinder is arranged in the second chute, and the telescopic end of the second anti-rotation cylinder is fixed with the upper positioning plate; the inner side surface of the first side plate is provided with a plurality of anti-rotation screw holes; the movable plate is arranged outside the second side plate; one end of each anti-rotation rod is connected to the inner measuring surface of the movable plate through a bearing, the surface of each anti-rotation rod is provided with external threads, the anti-rotation rods penetrate through the second side plate to be matched with the anti-rotation screw holes, the anti-rotation rods are parallel to each other and are arranged above the adsorption table, the anti-rotation rods are sleeved with chain wheels, and the chain wheels are sleeved with chains; the rotating shaft of the driving motor is connected with the anti-rotation rod. The upper positioning plate and the lower positioning plate are matched with the rotation of the adsorption table, when the adsorption table is about to rotate, the upper positioning plate and the lower positioning plate are controlled to retract into the sliding groove, then when the adsorption table is about to rotate to a designated angle, the corresponding positioning plate is controlled to extend out for blocking, and then the other positioning plate is controlled to clamp.

The upper locating plate and the lower locating plate are arranged and used for blocking when the adsorption table rotates, the rotating angle of the overturning motor is limited to 180 degrees, and the adsorption table can be clamped to prevent the adsorption table from rotating. When the second curb plate is connected with the absorption platform, control driving motor rotates, makes a plurality of anti-rotation poles rotate, under the effect of external screw thread, makes the movable plate remove, makes anti-rotation pole remove to anti-rotation hole to it is fixed with anti-rotation hole, strengthen the stability that the second curb plate is connected with the absorption platform.

Further, the fixing device comprises a first limiting plate, a second limiting plate, a protective layer, an adhesive layer, a first limiting cylinder, a second limiting cylinder and two supporting grooves; the first limiting plate is vertically arranged between the two mounting plates, is arranged on one side of the circuit board along the conveying direction of the conveying device, the lower part of the first limiting plate is connected with the rotating shaft of the base, the upper part of the first limiting plate is matched with the adsorption table, and the rotating axis of the first limiting plate is vertical to the conveying direction of the conveying device; the first limiting cylinder is arranged at the side of the first limiting plate, and two ends of the first limiting cylinder are respectively hinged with the first limiting plate and the base; the protective layer is a rubber layer and is arranged on the side surface of the first limit plate, which faces the circuit board; the adhesive layer is arranged on the protective layer; the second limiting plate is vertically arranged between the two mounting plates, is arranged on the other side of the circuit board, is opposite to the first limiting plate, the lower part of the second limiting plate is connected with the rotating shaft of the base, the upper part of the second limiting plate is matched with the adsorption table, and the rotating axis of the second limiting plate is vertical to the conveying direction of the conveying device; the second limiting cylinder is arranged at the side of the second limiting plate, and two ends of the second limiting cylinder are respectively hinged with the second limiting plate and the base; the two supporting grooves are respectively arranged on the upper parts of the first limiting plate and the second limiting plate and are matched with the adsorption device. The adhesive layer is double faced adhesive tape, so that the replacement is convenient. The supporting groove corresponds to the supporting block and prevents the supporting block from moving.

The control circuit board stops through the position sensor with a certain error. The first limiting plate is used for blocking the circuit board, and when the circuit board is connected with the adhesive layer, the circuit board can be adhered to the surface of the circuit board, so that displacement caused by collision is reduced. And a second limiting plate is arranged and matched with the first limiting plate to limit the circuit board. Before and after the circuit board overturns, the circuit board can be limited through the first limiting plate and the second limiting plate. The first limiting cylinder and the second limiting cylinder are arranged and are used for adapting to the moving route of the adsorption table.

Further, the fixing device comprises two pressing plates and two fixing cylinders; the inner side surface of the mounting plate is transversely provided with a fixing groove, the fixing groove is arranged at the side of the circuit board, and the length of the fixing groove is matched with that of the circuit board; the two compacting plates are respectively arranged in the fixed groove, matched with the circuit board and matched with the first conveying roller and the second conveying roller, the inner side surfaces of the compacting plates are inclined surfaces which incline downwards from the inner side to the outer side, and rubber layers are arranged on the inclined surfaces and matched with the circuit board; the two fixed cylinders are respectively arranged on the outer side of the mounting plate, the telescopic ends of the two fixed cylinders penetrate through the mounting plate and are connected with the pressing plate, and the axes of the fixed cylinders are transversely arranged.

After the first limiting plate and the second limiting plate limit the circuit board, the fixed air cylinder is controlled to extend, so that the two compacting plates move to compact the circuit board through the inclined surface, and the circuit board is fixed by being matched with the first conveying roller and the second conveying roller. The compacting plates are positioned above the adjacent first conveying roller and second conveying roller.

Further, the fixing device comprises a plurality of first supporting cylinders, a plurality of second supporting cylinders, a first supporting table, a second supporting table and a plurality of supporting rods; the plurality of first supporting cylinders are vertically arranged between the two conveying devices; the first supporting tables are fixed at the telescopic ends of the first supporting cylinders and positioned below the circuit board and matched with the circuit board, and a rubber layer is arranged on the upper surface of each first supporting table; the second supporting table is arranged below the first supporting table; the plurality of second supporting cylinders are vertically arranged below the second supporting table and fixed with the second supporting table; the support rods are fixed on the second support table, penetrate through the second support table upwards, and are provided with rubber layers at the upper ends and matched with the circuit board. The upper ends of the support rods are matched with the circuit board, and the support rods which are correspondingly arranged are needed to support the positions without elements due to different circuits on the circuit board.

The circuit board has elasticity, and in the pressure equipment in-process, its middle part is concave easily, influences the pressure equipment effect. Before the circuit board is turned over, the second supporting cylinder is controlled to extend, so that the second supporting table is lifted, and the supporting rod is lifted to be connected with a part without elements on the circuit board. When the circuit board is turned over, the first supporting cylinder is controlled to extend, so that the first supporting table rises and is connected with the pressed shielding cover.

A control method of an electromagnetic interference prevention press-fitting system comprises the following steps: when the adsorption table presses the shielding cover in the second limiting groove to the bottom surface of the circuit board and ascends, the following steps are realized: a1: the upper positioning plate, the lower positioning plate, the first sealing plate and the second sealing plate are controlled to shrink, then the adsorption table is controlled to rotate 180 degrees through the overturning motor, then the upper positioning plate, the lower positioning plate, the first sealing plate and the second sealing plate are controlled to extend out, and then the adsorption table is controlled to descend to press the shielding cover; a2: and controlling the adsorption table to ascend, and then outputting the circuit board. When the circuit board is placed, the height of the shielding cover on the top surface of the circuit board is not higher than that of the shielding cover on the bottom surface, so that the adsorption table can be pressed to the shielding cover.

After the press-fitting process, the shielding cover on the bottom surface of the circuit board may be loosened under the action of the second detection layer, and since the bottom surface and the top surface of the circuit board are generally different, the arrangement of the first limit groove and the second limit groove is different, so that the shielding cover can be controlled to be pressed after the adsorption table rotates 180 degrees, and the next press-fitting process can be continued after the adsorption table is turned over.

A control method of an electromagnetic interference prevention press-fitting system comprises the following steps: after the press fitting process is finished, if the infrared sensor senses that the shielding cover is positioned in the limiting groove, the following steps are carried out: b1, controlling the adsorption platform to move to the upper part of the empty platform through a moving device; and B2, controlling the upper positioning plate, the lower positioning plate, the first sealing plate and the second sealing plate to shrink, controlling the adsorption table to rotate for 90 degrees through a turnover motor, controlling fan blades of the first negative pressure device and the second negative pressure device to reversely rotate, blowing down the shielding cover onto the empty platform through air flow, controlling the first negative pressure device and the second negative pressure device to stop, controlling the adsorption table to rotate through the turnover motor, enabling the first limiting groove to face downwards, controlling the upper positioning plate, the lower positioning plate, the first sealing plate and the second sealing plate to stretch, and then performing the next press-fitting process.

The shield can left in the limit groove is blown out by the blowing-out air flow.

The invention has the beneficial effects that:

1. the overturning motor is arranged, so that the circuit board can be overturned;

2. the second limit groove is arranged, so that the shielding cover can be pressed on the bottom surface of the circuit board;

3. the limiting plate and the pressing plate are arranged, so that the circuit board can be fixed.

Drawings

FIG. 1 is a schematic cross-sectional view of a front view of the present anti-electromagnetic interference press-fit system;

FIG. 2 is a schematic top view of the present anti-electromagnetic interference press-fitting system;

FIG. 3 is a schematic cross-sectional view of an adsorption stage elevation of the present electromagnetic interference resistant press-fit system;

FIG. 4 is a schematic cross-sectional view of a front view of a first limiting plate of the present anti-electromagnetic interference press-fit system;

reference numerals illustrate:

1. a base;

2. an X-axis moving structure;

3. a Y-axis moving structure; 31. a second mobile station;

4. a lifting cylinder;

5. a fixing plate; 51. a first side plate; 52. a second side plate; 521. a driving motor; 522. an anti-rotation rod; 523. a moving plate; 53. a second anti-rotation cylinder; 54. a lower positioning plate; 55. a first anti-rotation cylinder; 56. an upper positioning plate;

6. an adsorption table; 61. a turnover motor; 62. a first cylinder; 63. a first sealing plate; 631. a first mating groove; 64. a first detection layer; 65. a first support block; 66. a second cylinder; 67. a second sealing plate; 671. a second mating groove; 68. a second detection layer; 69. a second support block;

7. a first limiting plate; 71. a second limiting plate; 72. a protective layer; 73. an adhesive layer;

8. a first support cylinder; 81. a first support table; 82. a second support cylinder; 83. a second support table; 84. a support rod; 85. a compacting plate; 86. a fixed cylinder;

9. A mounting plate; 91. a first conveyor belt; 92. and a second conveyor belt.

Detailed Description

The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention.

Example 1:

as shown in fig. 1 and 2, an electromagnetic interference prevention press-fitting system comprises a base 1, two conveying devices, an adsorption device, a moving device, a fixing device, a control system and a display; the two conveying devices are symmetrically arranged above the base 1, and each conveying device comprises a mounting plate 9, a first conveying belt 91, a second conveying belt 92 and a position sensor; the two mounting plates 9 are arranged above the base 1 in parallel; the first conveying belts 91 are respectively arranged on the inner sides of the mounting plates 9, two first conveying rollers are arranged in the first conveying belts 91, and the first conveying rollers are connected with the mounting plates 9 through bearings; the second conveyer belt 92 is arranged on the inner sides of the two mounting plates 9 and matched with the first conveyer belt 91, two second conveyer rollers are arranged in the second conveyer belt 92, and the second conveyer rollers are connected with the mounting plates 9; the fixing device is arranged between the two conveying devices and is matched with the circuit board; the moving device comprises an X-axis moving structure 2, a Y-axis moving structure 3 and a Z-axis moving structure; the X-axis moving structure 2 is arranged above the conveying device, and the X-axis moving structure 2 comprises a first moving table; the Y-axis moving structure 3 is disposed on the first moving stage, and the Y-axis moving structure 3 includes a second moving stage 31; the Z-axis moving structure comprises a lifting cylinder 4, wherein the lifting cylinder 4 is arranged on the second moving table 31, and the lifting cylinder 4 is positioned above the circuit board; the adsorption device comprises a first negative pressure device, an adsorption table 6, a plurality of first adsorption holes, a plurality of first limit grooves and a plurality of infrared sensors; the adsorption table 6 is transversely arranged below the lifting cylinder 4, is connected with the telescopic end of the lifting cylinder 4 and is matched with the circuit board; the first limit groove is a groove and is arranged on the bottom surface of the adsorption table 6 and is respectively matched with the shapes of the shielding cases, a first detection layer 64 is arranged on the inner side surface of the first limit groove, and the first detection layer 64 is an elastic rubber layer; the first adsorption holes are respectively arranged on the inner top surfaces of the first limit grooves; the infrared sensors are respectively arranged on the top surfaces inside the first limit grooves; the first negative pressure device is communicated with a plurality of first adsorption holes; the control system is connected with the conveying device, the adsorption device, the moving device, the fixing device and the display. The X-axis moving structure 2 and the Y-axis moving structure 3 are screw-driven moving structures. If the circuit board needs to be pressed with a plurality of shielding cases, all shielding cases can be adsorbed into the first limiting groove, and meanwhile the circuit board is pressed without repeated reciprocating, so that the working efficiency is improved. The second conveyor 92 cooperates with the first conveyor 91 to convey the circuit board. The fixing device is matched with the circuit board to fix the circuit board. The adsorption table 6 is matched with the circuit board to realize the press fitting of the shielding cover. The negative pressure device generates negative pressure through the fan blades.

The shielding cover to be pressed on the top surface of the circuit board is sucked into the corresponding first limit groove through negative pressure at the feeding position of the external shielding cover by controlling the suction table 6 through the moving device. Then place the circuit board on two first conveyer belts 91, start first conveyer belt 91 and second conveyer belt 92, when the circuit board carried adsorption platform 6 below, by the position sensor sensing, then control fixing device and fix the circuit board, then make adsorption platform 6 descend through lift cylinder 4, make the shield cover pressure equipment to the shielding frame, then stop first negative pressure ware, make the shield cover separate with first absorption hole, then control adsorption platform 6 through lift cylinder 4 and rise, then control first conveyer belt 91 and second conveyer belt 92 with the circuit board output. The adjacent first conveying roller and second conveying roller are used for supporting the circuit board. Because the machining precision of the shielding frame or the shielding cover is insufficient, the pressing assembly is not tight and the shielding frame or the shielding cover is easy to fall off. The first detection layer 64 is configured to detect whether there is a tight shielding case of press-fitting, prevent the shielding case from falling off in the subsequent process, if the press-fitting is not tight, when the adsorption table 6 rises, the shielding case will rise under the friction force action of the rubber layer, and the infrared sensor can sense the position change of the shielding case, so as to mark the tight shielding case of press-fitting and the circuit board, and send warning information through the display, so that the staff can perform manual press-fitting on the related circuit board. By varying the elasticity of the first detection layer 64, the detection criteria can be adjusted. An infrared sensor is provided for alignment at the time of adsorption.

As shown in fig. 3, the adsorption device comprises a fixed plate 5, a first side plate 51, a second side plate 52, a turnover motor 61, a second negative pressure device, a plurality of second adsorption holes, a plurality of second limit grooves and a turnover shaft; the fixed plate 5 is fixed at the telescopic end of the lifting cylinder 4; the first side plate 51 is fixed on the lower part of the fixed plate 5 and is positioned on one side of the adsorption table 6 and between the two conveying devices; the second side plate 52 is arranged below the fixed plate 5, is positioned on two sides of the adsorption table 6, is arranged opposite to the first side plate 51, and is connected with a rotating shaft of the fixed plate 5, the rotating shaft of the second side plate 52 is connected with a rotating motor, and a turnover groove is formed in the inner side surface of the second side plate 52; the turnover motor 61 is fixed on the outer side surface of the first side plate 51, the rotating shaft of the turnover motor 61 penetrates through the first side plate 51 and is fixed with the center of the side surface of the adsorption table 6, and the rotating shaft of the turnover motor 61 is arranged along the conveying direction of the conveying device; the turnover shaft is rod-shaped, is fixed on the side surface of the adsorption table 6, has the axis coincident with the rotation axis of the turnover motor 61 and is matched with the turnover groove; the second limit groove is arranged on the top surface of the adsorption table 6 and is respectively matched with the shapes of the shielding cases, a second detection layer 68 is arranged on the inner side surface of the second limit groove, and the second detection layer 68 is an elastic rubber layer; the second adsorption holes are respectively arranged on the inner bottom surfaces of the second limit grooves; the infrared sensors are respectively arranged on the inner bottom surfaces of the second limit grooves; the second negative pressure device is communicated with a plurality of second adsorption holes. The turnover shaft is matched with the turnover groove and can be mutually separated, and the turnover shaft can rotate in the turnover groove.

For circuit boards with components mounted on both sides, it may be the case that a press-like shield is required on both sides of the circuit board. When the adsorption table 6 presses the shielding cover onto the circuit board, the first negative pressure device is not stopped, the fixing device is controlled to be released, then the adsorption table 6 is controlled to drive the circuit board to ascend, then the adsorption table 6 is controlled to rotate 180 degrees through the overturning motor 61, then the adsorption table 6 is controlled to descend, the circuit board falls onto the conveying belt, the bottom surface of the circuit board faces upwards, the fixing device is controlled to fix the circuit board, then the first negative pressure device is stopped, then the adsorption table 6 is controlled to descend, the adsorption table 6 is separated from the circuit board, then the second side plate 52 is rotated through the rotating motor, the second side plate 52 is separated from the adsorption table 6, then the adsorption table 6 is controlled to move along the conveying direction of the conveying device through the moving device, and when the adsorption table 6 moves to the outer side of the circuit board, the adsorption table 6 is controlled to ascend, then the rotating motor is controlled to rotate, and the second side plate 52 is connected with the adsorption table 6. And then the absorption table 6 is controlled to absorb the shielding cover needed by the bottom surface of the circuit board into the second limit groove and press-fit the shielding cover onto the bottom surface of the circuit board.

The adsorption device comprises a first communication cavity, a second communication cavity, a first sealing plate 63, a second sealing plate 67, a first air cylinder 62 and a second air cylinder 66; the first communication cavity is transversely arranged in the adsorption table 6; a first cylinder 62 is arranged in the first communication cavity, and the first cylinder 62 is arranged along the conveying direction of the conveying device; the first sealing plate 63 is disposed in the first communication cavity, is tightly matched with the first communication cavity, and is fixed with the telescopic end of the first cylinder 62; the upper ports of the first adsorption holes are arranged on the inner bottom surface of the first communication cavity at intervals along the axial direction of the first cylinder 62 and are tightly matched with the first sealing plate 63; the first negative pressure device is communicated with one side, close to the first cylinder 62, of the first communication cavity through a hose; the second communication cavity is transversely arranged in the adsorption table 6 and is positioned above the first communication cavity; a second air cylinder 66 is arranged in the second communication cavity, and the second air cylinder 66 is arranged along the conveying direction of the conveying device; the second sealing plate 67 is arranged in the second communication cavity, is tightly matched with the second communication cavity, and is fixed with the telescopic end of the second air cylinder 66; the lower ports of the second adsorption holes are arranged on the inner top surface of the second communication cavity at intervals along the axial direction of the second air cylinder 66 and are tightly matched with the second sealing plate 67; the second negative pressure device communicates with a side of the second communication cavity near the second cylinder 66 through a hose. The first sealing plate 63 is closely fitted with the first communication cavity, preventing air leakage. The upper ports of the plurality of first adsorption holes are tightly matched with the first sealing plate 63 and are arranged according to the adsorption sequence of the first limiting grooves.

When a plurality of shielding cases are adsorbed into the limit groove, the shielding cases are required to be adsorbed in sequence. The first cylinder 62 is controlled to extend, so that the first sealing plate 63 is moved, and the plurality of first adsorption holes are sequentially communicated with the first negative pressure device, so that the shielding cover is sequentially adsorbed. The adsorption process of the second adsorption hole is the same.

The adsorption device comprises a first matching groove 631, a second matching groove 671, two first supporting blocks 65 and two second supporting blocks 69; the first communicating cavity is open in a direction facing the first side plate 51, and the opening is far away from the first cylinder 62; the first fitting groove 631 is disposed on the inner side surface of the first side plate 51 and is fitted with the first sealing plate 63; the second communicating cavity surface has an opening in the direction of the first side plate 51, and the opening is far away from the second air cylinder 66; the second fitting groove 671 is provided on the inner side surface of the first side plate 51 to be fitted with the second sealing plate 67, and the second fitting groove 671 and the first fitting groove 631 are center-symmetrical with respect to the rotation axis of the turnover motor 61; the two first supporting blocks 65 are made of rubber materials and are fixed on the bottom surface of the adsorption table 6 and matched with the circuit board; the two second supporting blocks 69 are made of rubber materials and are fixed on the top surface of the adsorption table 6 to be matched with the circuit board. The two first support blocks 65 cooperate with the circuit board to enable the shielding case to be just pressed onto the shielding frame.

Since the suction table 6 is rotatable, a swing occurs at the time of press fitting and moving. The first and second cylinders 62 and 66 are controlled to extend so that the first and second sealing plates 63 and 67 enter the first and second fitting grooves 631 and 671 to be fixed. The first supporting block 65 and the second supporting block 69 are arranged and used for being abutted against the first limiting plate 7 and the second limiting plate 71, limiting the distance between the adsorption table 6 and the circuit board, and preventing the circuit board from being damaged due to overlarge force. The second fitting groove 671 and the first fitting groove 631 are center-symmetrical about the rotation axis of the flipping motor 61 for fixing the sealing plate and the fitting groove to each other after the rotation of the suction table 6. The first support block 65 and the second support block 69 are provided to be adjustable according to the height of the shield.

The adsorption device comprises an upper positioning plate 56, a lower positioning plate 54, a first anti-rotation cylinder 55, a second anti-rotation cylinder 53, a plurality of anti-rotation rods 522, a moving plate 523 and a driving motor 521; a first chute is transversely arranged on the inner measuring surface of the first side plate 51 and is positioned on one side of the rotation axis of the adsorption table 6; the upper positioning plate 56 is arranged in the first chute, is connected with the upper surface of the adsorption table 6 and is matched with the rotation of the adsorption table 6, and a rubber layer is arranged on the lower surface of the upper positioning plate 56; the first anti-rotation cylinder 55 is arranged in the first chute, and the telescopic end of the first anti-rotation cylinder is fixed with the upper positioning plate 56; a second chute is transversely arranged on the inner measuring surface of the first side plate 51, and the second chute is positioned at one side of the rotation axis of the adsorption table 6 and is positioned below the first chute; the lower positioning plate 54 is arranged in the second chute, is connected with the lower surface of the adsorption table 6, is matched with the rotation of the adsorption table 6, and a rubber layer is arranged on the upper surface of the lower positioning plate 54; the second anti-rotation cylinder 53 is arranged in the second chute, and the telescopic end of the second anti-rotation cylinder is fixed with the upper positioning plate 56; a plurality of anti-rotation screw holes are formed in the inner side surface of the first side plate 51; the moving plate 523 is disposed outside the second side plate 52; one end of each anti-rotation rod 522 is connected to the inner measuring surface of the movable plate 523 through a bearing, the surface of each anti-rotation rod 522 is provided with external threads and penetrates through the second side plate 52 to be matched with the anti-rotation screw holes, the anti-rotation rods 522 are parallel to each other and are arranged above the adsorption table 6, the anti-rotation rods 522 are sleeved with chain wheels, and the chain wheels are sleeved with chains; the rotation shaft of the driving motor 521 is connected to the rotation preventing lever 522. The upper positioning plate 56 and the lower positioning plate 54 are matched with the rotation of the adsorption table 6, when the adsorption table 6 is about to rotate, the upper positioning plate 56 and the lower positioning plate 54 are controlled to retract into the sliding groove, then when the adsorption table 6 is about to rotate to a designated angle, the corresponding positioning plates are controlled to extend out for blocking, and then the other positioning plate is controlled to clamp.

An upper positioning plate 56 and a lower positioning plate 54 are provided for blocking when the adsorption table 6 rotates, limiting the rotation angle of the turnover motor 61 to 180 degrees, and being capable of clamping the adsorption table 6 to prevent rotation thereof. When the second side plate 52 is connected with the adsorption table 6, the driving motor 521 is controlled to rotate, so that the rotation preventing rods 522 rotate, and the moving plate 523 moves under the action of the external threads, so that the rotation preventing rods 522 move towards the rotation preventing holes and are fixed with the rotation preventing holes, and the connection stability of the second side plate 52 and the adsorption table 6 is enhanced.

As shown in fig. 4, the fixing device comprises a first limiting plate 7, a second limiting plate 71, a protective layer 72, an adhesive layer 73, a first limiting cylinder, a second limiting cylinder and two supporting grooves; the first limiting plate 7 is vertically arranged between the two mounting plates 9, is arranged on one side of the circuit board along the conveying direction of the conveying device, the lower part of the first limiting plate is connected with the rotating shaft of the base 1, the upper part of the first limiting plate is matched with the adsorption table 6, and the rotating axis of the first limiting plate is vertical to the conveying direction of the conveying device; the first limiting cylinder is arranged at the side of the first limiting plate 7, and two ends of the first limiting cylinder are respectively hinged with the first limiting plate 7 and the base 1; the protective layer 72 is a rubber layer and is arranged on the side surface of the first limiting plate 7 facing the circuit board; the adhesive layer 73 is disposed on the protective layer 72; the second limiting plate 71 is vertically arranged between the two mounting plates 9, is arranged on the other side of the circuit board, is opposite to the first limiting plate 7, is connected with the rotating shaft of the base 1 at the lower part thereof, is matched with the adsorption table 6 at the upper part thereof, and has a rotating axis vertical to the conveying direction of the conveying device; the second limiting cylinder is arranged at the side of the second limiting plate 71, and two ends of the second limiting cylinder are respectively hinged with the second limiting plate 71 and the base 1; the two supporting grooves are respectively arranged on the upper parts of the first limiting plate 7 and the second limiting plate 71 and are matched with the adsorption device. The adhesive layer 73 is double-sided adhesive tape, and is convenient to replace. The supporting groove corresponds to the supporting block and prevents the supporting block from moving.

The control circuit board stops through the position sensor with a certain error. A first limiting plate 7 is provided for blocking the circuit board, which is stuck to the surface of the adhesive layer 73 when it is connected thereto, so as to reduce displacement caused by collision. A second limiting plate 71 is provided and cooperates with the first limiting plate 7 to limit the circuit board. Before and after the circuit board is turned over, the circuit board can be limited by the first limiting plate 7 and the second limiting plate 71. A first limiting cylinder and a second limiting cylinder are arranged for adapting to the moving route of the adsorption table 6.

The fixing device comprises two pressing plates 85 and two fixing cylinders 86; the inner side surface of the mounting plate 9 is transversely provided with a fixing groove, the fixing groove is arranged at the side of the circuit board, and the length of the fixing groove is matched with that of the circuit board; the two compacting plates 85 are respectively arranged in the fixed groove, matched with the circuit board and matched with the first conveying roller and the second conveying roller, the inner side surfaces of the compacting plates 85 are inclined surfaces which incline downwards from the inner side to the outer side, and rubber layers are arranged on the inclined surfaces and matched with the circuit board; the two fixed cylinders 86 are respectively arranged outside the mounting plate 9, the telescopic ends of the two fixed cylinders penetrate through the mounting plate 9 and are connected with the pressing plate 85, and the axes of the fixed cylinders 86 are transversely arranged.

After the first limiting plate 7 and the second limiting plate 71 limit the circuit board, the fixing cylinder 86 is controlled to extend, so that the two pressing plates 85 move to press the circuit board through the inclined surface, and the circuit board is fixed by being matched with the first conveying roller and the second conveying roller. The pinch plate 85 is located above the adjacent first and second conveying rollers.

The fixing device comprises a plurality of first supporting cylinders 8, a plurality of second supporting cylinders 82, a first supporting table 81, a second supporting table 83 and a plurality of supporting rods 84; a plurality of first supporting cylinders 8 are vertically arranged between the two conveying devices; the first supporting tables 81 are fixed at the telescopic ends of the first supporting cylinders 8, are positioned below the circuit board and are matched with the circuit board, and a rubber layer is arranged on the upper surface of each first supporting table 81; the second support table 83 is disposed below the first support table 81; the plurality of second supporting cylinders 82 are vertically arranged below the second supporting table 83 and fixed with the second supporting table 83; the support rods 84 are fixed on the second support table 83, the support rods 84 penetrate through the second support table 83 upwards, and rubber layers are arranged at the upper ends of the support rods 84 and matched with the circuit board. The upper ends of the support rods 84 are matched with the circuit board, and the support rods 84 which are correspondingly arranged are required to be used for supporting the positions without elements due to different circuits on the circuit board.

The circuit board has elasticity, and in the pressure equipment in-process, its middle part is concave easily, influences the pressure equipment effect. Before the circuit board is turned over, the second support cylinder 82 is controlled to extend, the second support table 83 is lifted, and the support rod 84 is lifted to contact the part of the circuit board where no component is present. When the circuit board is turned over, the first supporting cylinder 8 is controlled to extend, so that the first supporting table 81 is lifted and connected with the pressed shielding cover.

The working process of the embodiment is as follows: the shielding cover to be pressed on the top surface of the circuit board is sucked into the corresponding first limit groove through negative pressure at the feeding position of the external shielding cover by controlling the suction table 6 through the moving device. Then place the circuit board on two first conveyer belts 91, start first conveyer belt 91 and second conveyer belt 92, when the circuit board carried adsorption table 6 below, by the position sensor sensing, then carry out the circuit board through first limiting plate 7 and second limiting plate 71 and carry out spacing, then control fixed cylinder 86 extension, make two pressure strips 85 remove, compress tightly the circuit board through the slope, cooperate to fix the circuit board with first conveying roller and second conveying roller. The second support cylinder 82 is controlled to extend, the second support table 83 is raised, and the support rod 84 is raised to contact a portion of the circuit board where no component is present. Then, the suction table 6 is lowered by the lifting cylinder 4, and the shield can is press-fitted to the shield frame. The fixing device is controlled to be released, then the adsorption table 6 is controlled to drive the circuit board to rise, then the adsorption table 6 is controlled to rotate 180 degrees through the overturning motor 61, then the adsorption table 6 is controlled to descend, the circuit board is enabled to fall onto the conveying belt, the bottom surface of the circuit board faces upwards, the fixing device is controlled to fix the circuit board, then the first negative pressure device is stopped, then the adsorption table 6 is controlled to descend, the adsorption table 6 is separated from the circuit board, then the second side plate 52 is enabled to rotate through the rotating motor, the second side plate 52 is enabled to be separated from the adsorption table 6, then the adsorption table 6 is enabled to move along the conveying direction of the conveying device through the moving device, when the adsorption table 6 moves to the outer side of the circuit board, the adsorption table 6 is controlled to rise, and then the rotating motor is controlled to rotate, and the second side plate 52 is enabled to be connected with the adsorption table 6. Then the adsorption table 6 is controlled to adsorb the shielding cover needed by the bottom surface of the circuit board into the second limiting groove, the shielding cover is pressed on the bottom surface of the circuit board, then the second negative pressure device is stopped, the adsorption table 6 is controlled to ascend and separate from the circuit board, then the fixing device is controlled to loosen the circuit board, and then the first conveying belt 91 and the second conveying belt 92 are controlled to output the circuit board.

When the shielding cover is adsorbed, the first cylinder 62 is controlled to extend, so that the first sealing plate 63 is moved, and a plurality of first adsorption holes are sequentially communicated with the first negative pressure device, so that the shielding cover is sequentially adsorbed. The adsorption process of the second adsorption hole is the same.

When the adsorption table 6 is fixed, the first cylinder 62 and the second cylinder 66 are controlled to extend, so that the first sealing plate 63 and the second sealing plate 67 enter the first fitting groove 631 and the second fitting groove 671, and the fixation is realized.

When the second side plate 52 is connected with the adsorption table 6, the driving motor 521 is controlled to rotate, so that the rotation preventing rods 522 rotate, and the moving plate 523 moves under the action of the external threads, so that the rotation preventing rods 522 move towards the rotation preventing holes and are fixed with the rotation preventing holes, and the connection stability of the second side plate 52 and the adsorption table 6 is enhanced.

When the circuit board is turned over, the first supporting cylinder 8 is controlled to extend, so that the first supporting table 81 is lifted and connected with the pressed shielding cover.

A control method of an electromagnetic interference prevention press-fitting system comprises the following steps: when the adsorption table 6 presses the shielding cover in the second limiting groove to the bottom surface of the circuit board and ascends, the following steps are realized: a1: the upper positioning plate 56, the lower positioning plate 54, the first sealing plate 63 and the second sealing plate 67 are controlled to shrink, then the absorption table 6 is controlled to rotate 180 degrees through the overturning motor 61, then the upper positioning plate 56, the lower positioning plate 54, the first sealing plate 63 and the second sealing plate 67 are controlled to extend out, and then the absorption table 6 is controlled to descend to press the shielding cover; a2: the suction table 6 is controlled to rise, and then the circuit board is output. When the circuit board is placed, the height of the shielding cover on the top surface of the circuit board is not higher than that of the shielding cover on the bottom surface, so that the adsorption table 6 can be pressed to the shielding cover.

After the press-fitting process, the shielding case on the bottom surface of the circuit board may be loosened under the action of the second detection layer 68, and since the bottom surface and the top surface of the circuit board are generally different, the arrangement of the first limiting groove and the second limiting groove is different, so that the adsorption table 6 can be controlled to rotate 180 degrees to press the shielding case, and the next press-fitting process can be continued after the overturning.

A control method of an electromagnetic interference prevention press-fitting system comprises the following steps: after the press fitting process is finished, if the infrared sensor senses that the shielding cover is positioned in the limiting groove, the following steps are carried out: b1, controlling the adsorption platform 6 to move above the empty platform through a moving device; b2, controlling the upper positioning plate 56, the lower positioning plate 54, the first sealing plate 63 and the second sealing plate 67 to shrink, controlling the adsorption table 6 to rotate 90 degrees through the overturning motor 61, controlling the fan blades of the first negative pressure device and the second negative pressure device to reversely rotate, blowing the shielding cover onto the empty platform through air flow, controlling the first negative pressure device and the second negative pressure device to stop, controlling the adsorption table 6 to rotate through the overturning motor 61, enabling the first limiting groove to face downwards, controlling the upper positioning plate 56, the lower positioning plate 54, the first sealing plate 63 and the second sealing plate 67 to stretch, and then performing the next press fitting process.

The above-described embodiments are only some embodiments, but not all embodiments, of the present invention, and other embodiments, which are obtained by those skilled in the art without any inventive effort, are within the scope of the present invention.

Claims

1. An electromagnetic interference prevention press-fitting system is characterized by comprising a base (1), two conveying devices, an adsorption device, a moving device, a fixing device, a control system and a display; the two conveying devices are symmetrically arranged above the base (1), and each conveying device comprises a mounting plate (9), a first conveying belt (91), a second conveying belt (92) and a position sensor; the two mounting plates (9) are arranged above the base (1) in parallel; the first conveying belt (91) is arranged on the inner side of the mounting plate (9), at least two first conveying rollers are arranged in the first conveying belt (91), and the first conveying rollers are connected with the mounting plate (9) through bearings; the second conveying belt (92) is arranged on the inner side of the mounting plate (9) and matched with the first conveying belt (91), at least two second conveying rollers are arranged in the second conveying belt (92), and the second conveying rollers are connected with the mounting plate (9); the fixing device is arranged between the two conveying devices and matched with the circuit board; the moving device comprises an X-axis moving structure (2), a Y-axis moving structure (3) and a Z-axis moving structure; the X-axis moving structure (2) is arranged above the conveying device, and the X-axis moving structure (2) comprises a first moving table; the Y-axis moving structure (3) is arranged on the first moving table, and the Y-axis moving structure (3) comprises a second moving table (31); the Z-axis moving structure comprises a lifting cylinder (4), the lifting cylinder (4) is arranged on the second moving table (31), and the lifting cylinder (4) is positioned above the circuit board; the adsorption device comprises a first negative pressure device, an adsorption table (6), a plurality of first adsorption holes, a plurality of first limit grooves and a plurality of infrared sensors; the adsorption table (6) is transversely arranged below the lifting cylinder (4), is connected with the telescopic end of the lifting cylinder (4) and is matched with the circuit board; the first limit groove is a groove and is arranged on the bottom surface of the adsorption table (6) and is respectively matched with the shapes of the shielding cases, a first detection layer (64) is arranged on the inner side surface of the first limit groove, and the first detection layer (64) is an elastic rubber layer; the first adsorption holes are respectively arranged on the inner top surfaces of the first limit grooves; the infrared sensors are respectively arranged on the inner top surfaces of the first limit grooves; the first negative pressure device is communicated with a plurality of first adsorption holes; the control system is connected with the conveying device, the adsorption device, the moving device, the fixing device and the display;

The adsorption device further comprises a fixed plate (5), a first side plate (51), a second side plate (52), a turnover motor (61), a second negative pressure device, a plurality of second adsorption holes, a plurality of second limit grooves and a turnover shaft; the fixing plate (5) is fixed at the telescopic end of the lifting cylinder (4); the first side plate (51) is fixed at the lower part of the fixed plate (5), is positioned at one side of the adsorption table (6) and is positioned between the two conveying devices; the second side plates (52) are arranged below the fixed plates (5) and are positioned on two sides of the adsorption table (6), the second side plates are arranged opposite to the first side plates (51), the upper parts of the second side plates are connected with rotating shafts of the fixed plates (5), the rotating shafts of the second side plates (52) are connected with rotating motors, and overturning grooves are formed in the inner side surfaces of the second side plates (52); the turnover motor (61) is fixed on the outer side surface of the first side plate (51), a rotating shaft of the turnover motor penetrates through the first side plate (51) and is fixed with the center of the side surface of the adsorption table (6), and the rotating shaft of the turnover motor (61) is arranged along the conveying direction of the conveying device; the turnover shaft is rod-shaped, is fixed on the side surface of the adsorption table (6), and has an axis coincident with the rotation axis of the turnover motor (61) and matched with the turnover groove; the second limit groove is arranged on the top surface of the adsorption table (6) and is respectively matched with the shapes of a plurality of shielding covers, a second detection layer (68) is arranged on the inner side surface of the second limit groove, and the second detection layer (68) is an elastic rubber layer; the second adsorption holes are respectively arranged on the inner bottom surfaces of the second limit grooves; the infrared sensors are respectively arranged on the inner bottom surfaces of the second limit grooves; the second negative pressure device is communicated with a plurality of second adsorption holes;

The adsorption device further comprises a first communication cavity, a second communication cavity, a first sealing plate (63), a second sealing plate (67), a first air cylinder (62) and a second air cylinder (66); the first communication cavity is transversely arranged in the adsorption table (6); a first air cylinder (62) is arranged in the first communication cavity, and the first air cylinder (62) is arranged along the conveying direction of the conveying device; the first sealing plate (63) is arranged in the first communication cavity, is tightly matched with the first communication cavity, and is fixed with the telescopic end of the first cylinder (62); the upper ports of the first adsorption holes are arranged on the inner bottom surface of the first communication cavity at intervals along the axial direction of the first cylinder (62) and are tightly matched with the first sealing plate (63); the first negative pressure device is communicated with one side, close to the first cylinder (62), of the first communication cavity through a hose;

the second communication cavity is transversely arranged in the adsorption table (6) and is positioned above the first communication cavity; a second air cylinder (66) is arranged in the second communication cavity, and the second air cylinder (66) is arranged along the conveying direction of the conveying device; the second sealing plate (67) is arranged in the second communication cavity, is tightly matched with the second communication cavity, and is fixed with the telescopic end of the second air cylinder (66); the lower ports of the second adsorption holes are arranged on the inner top surface of the second communication cavity at intervals along the axial direction of the second air cylinder (66) and are tightly matched with the second sealing plate (67); the second negative pressure device is communicated with one side, close to the second air cylinder (66), of the second communication cavity through a hose;

The adsorption device further comprises a first matching groove (631), a second matching groove (671), at least two first supporting blocks (65) and at least two second supporting blocks (69); the first communication cavity is open in the direction facing the first side plate (51), and the opening of the first communication cavity is far away from the first cylinder (62); the first matching groove (631) is arranged on the inner side surface of the first side plate (51) and matched with the first sealing plate (63); the direction of the first side plate (51) of the second communication cavity surface is an opening, and the opening of the second communication cavity surface is far away from the second air cylinder (66); the second matching groove (671) is arranged on the inner side surface of the first side plate (51) and matched with the second sealing plate (67), and the second matching groove (671) and the first matching groove (631) are symmetrical with the rotation axis of the turnover motor (61) in a center; the two first supporting blocks (65) are made of rubber materials and are fixed on the bottom surface of the adsorption table (6) to be matched with the circuit board; the two second supporting blocks (69) are made of rubber materials and are fixed on the top surface of the adsorption table (6) to be matched with the circuit board;

the adsorption device further comprises an upper positioning plate (56), a lower positioning plate (54), a first anti-rotation cylinder (55), a second anti-rotation cylinder (53), a plurality of anti-rotation rods (522), a moving plate (523) and a driving motor (521); a first chute is transversely arranged on the inner measuring surface of the first side plate (51), and the first chute is positioned at one side of the rotation axis of the adsorption table (6); the upper locating plate (56) is arranged in the first chute, is connected with the upper surface of the adsorption table (6), is matched with the rotation of the adsorption table (6), and a rubber layer is arranged on the lower surface of the upper locating plate (56); the first anti-rotation cylinder (55) is arranged in the first chute, and the telescopic end of the first anti-rotation cylinder is fixed with the upper positioning plate (56);

A second chute is transversely arranged on the inner measuring surface of the first side plate (51), and the second chute is positioned at one side of the rotation axis of the adsorption table (6) and is positioned below the first chute; the lower locating plate (54) is arranged in the second chute, is connected with the lower surface of the adsorption table (6), is matched with the rotation of the adsorption table (6), and a rubber layer is arranged on the upper surface of the lower locating plate (54); the second anti-rotation cylinder (53) is arranged in the second chute, and the telescopic end of the second anti-rotation cylinder is fixed with the upper positioning plate (56);

the inner side surface of the first side plate (51) is provided with a plurality of anti-rotation screw holes; the movable plate (523) is arranged outside the second side plate (52); one end of each anti-rotation rod (522) is connected to the inner measuring surface of the movable plate (523) through a bearing, external threads are arranged on the surface of each anti-rotation rod, the anti-rotation rods penetrate through the second side plate (52) to be matched with the anti-rotation screw holes, the anti-rotation rods (522) are parallel to each other and are arranged above the adsorption table (6), a sprocket wheel is sleeved on each anti-rotation rod (522), and a chain is sleeved on each sprocket wheel; the rotating shaft of the driving motor (521) is connected with the anti-rotation rod (522).

2. The electromagnetic interference resistant press-fit system as set forth in claim 1, wherein: the fixing device comprises a first limiting plate (7), a second limiting plate (71), a protective layer (72), an adhesive layer (73), a first limiting cylinder, a second limiting cylinder and two supporting grooves; the first limiting plate (7) is vertically arranged between the two mounting plates (9), is arranged on one side of the circuit board along the conveying direction of the conveying device, the lower part of the first limiting plate is connected with the rotating shaft of the base (1), the upper part of the first limiting plate is matched with the adsorption table (6), and the rotating axis of the first limiting plate is vertical to the conveying direction of the conveying device; the first limiting cylinder is arranged at the side of the first limiting plate (7), and two ends of the first limiting cylinder are respectively hinged with the first limiting plate (7) and the base (1); the protective layer (72) is a rubber layer and is arranged on the side surface of the first limiting plate (7) facing the circuit board; the adhesive layer (73) is arranged on the protective layer (72);

the second limiting plate (71) is vertically arranged between the two mounting plates (9), is arranged on the other side of the circuit board, is opposite to the first limiting plate (7), the lower part of the second limiting plate is connected with the rotating shaft of the base (1), the upper part of the second limiting plate is matched with the adsorption table (6), and the rotating axis of the second limiting plate is vertical to the conveying direction of the conveying device; the second limiting cylinder is arranged at the side of the second limiting plate (71), and two ends of the second limiting cylinder are respectively hinged with the second limiting plate (71) and the base (1); the two supporting grooves are respectively arranged on the upper parts of the first limiting plate (7) and the second limiting plate (71) and are matched with the adsorption device.

3. The electromagnetic interference resistant press-fit system as set forth in claim 2, wherein: the fixing device comprises two pressing plates (85) and two fixing cylinders (86); a fixing groove is transversely formed in the inner side surface of the mounting plate (9), the fixing groove is arranged on the side of the circuit board, and the length of the fixing groove is matched with that of the circuit board; the two pressing plates (85) are respectively arranged in the fixed groove, matched with the circuit board and matched with the first conveying roller and the second conveying roller, the inner side surfaces of the pressing plates (85) are inclined surfaces which incline downwards from inside to outside, and rubber layers are arranged on the inclined surfaces and matched with the circuit board; two fixed cylinders (86) are respectively arranged on the outer side of the mounting plate (9), the telescopic ends of the two fixed cylinders penetrate through the mounting plate (9) and are connected with the pressing plate (85), and the axes of the fixed cylinders (86) are transversely arranged.

4. An electromagnetic interference resistant press-fit system as set forth in claim 3, wherein: the fixing device comprises a plurality of first supporting cylinders (8), a plurality of second supporting cylinders (82), a first supporting table (81), a second supporting table (83) and a plurality of supporting rods (84); the plurality of first supporting cylinders (8) are vertically arranged between the two conveying devices; the first supporting tables (81) are fixed at the telescopic ends of the first supporting cylinders (8), are positioned below the circuit board and are matched with the circuit board, and rubber layers are arranged on the upper surfaces of the first supporting tables (81); the second supporting table (83) is arranged below the first supporting table (81); the second supporting cylinders (82) are vertically arranged below the second supporting table (83) and are fixed with the second supporting table (83); a plurality of supporting rods (84) are fixed on the second supporting table (83), the supporting rods (84) penetrate through the second supporting table (83) upwards, and a rubber layer is arranged at the upper ends of the supporting rods (84) and matched with the circuit board.

5. The method for controlling an electromagnetic interference preventing press-fit system according to claim 1, comprising:

when the adsorption table (6) presses the shielding cover in the second limiting groove to the bottom surface of the circuit board and ascends, the following steps are realized:

a1: the upper positioning plate (56), the lower positioning plate (54), the first sealing plate (63) and the second sealing plate (67) are controlled to shrink, then the adsorption table (6) is controlled to rotate 180 degrees through the overturning motor (61), then the upper positioning plate (56), the lower positioning plate (54), the first sealing plate (63) and the second sealing plate (67) are controlled to extend out, and then the adsorption table (6) is controlled to descend to press the shielding cover;

a2: the suction table (6) is controlled to rise, and then the circuit board is output.

6. The method for controlling an electromagnetic interference preventing press-fit system according to claim 1, comprising:

after the press fitting process is finished, if the infrared sensor senses that the shielding cover is positioned in the limiting groove, the following steps are carried out:

b1, controlling the adsorption platform (6) to move to the upper part of the empty platform through a moving device;

b2, controlling the upper positioning plate (56), the lower positioning plate (54), the first sealing plate (63) and the second sealing plate (67) to shrink, controlling the adsorption table (6) to rotate 90 degrees through the overturning motor (61), controlling fan blades of the first negative pressure device and the second negative pressure device to reversely rotate, blowing the shielding cover onto the empty platform through air flow, controlling the first negative pressure device and the second negative pressure device to stop, controlling the adsorption table (6) to rotate through the overturning motor (61), enabling the first limiting groove to face downwards, controlling the upper positioning plate (56), the lower positioning plate (54), the first sealing plate (63) and the second sealing plate (67) to stretch, and then performing the next press-fitting process.