BGA chip solder paste printing device

Abstract

The present invention relates to the technical field of chip solder paste printing, and specifically to a BGA chip solder paste printing device, comprising an angle adjustment mechanism, a pull-up switching mechanism, a synchronous locking mechanism, a rotating support, a mounting seat, an electric slide, a front scraper, a rear scraper, a hinged rod and a steel mesh. The steel mesh is detachably mounted on an equipment frame, and the front scraper and the rear scraper are located above the steel mesh. The BGA chip solder paste printing device can automatically adjust the angle of the mounting seat through the synchronous locking mechanism, so that the bottoms of the front scraper and the rear scraper can fit with the top of the steel mesh, solving the problem of the tilting of the top of the steel mesh, and can slide vertically upward through the rotating support, so that after the front scraper contacts the steel mesh, there is still a distance to make up for the gap between the scraper and the steel mesh, ensuring that the scraper can fit with the steel mesh, and the entire process does not use electric control adjustment, and can adapt to steel meshes with different gaps.

Description

Technical Field

[0001] The present invention relates to the technical field of chip solder paste printing, and in particular to a BGA chip solder paste printing device. Background Art

[0002] When printing solder paste on BGA chips, a linear moving mechanism is used to drive two scrapers to move horizontally. When moving to the initial position or the final position, the two scrapers are switched by a switching mechanism to complete the coating of the solder paste.

[0003] However, with this coating method, since the scraper needs to move up and down, when the equipment performs long-term printing work, a gap will be generated between the bottom of the scraper and the top of the steel mesh, which will eventually make it difficult to scrape the required thickness of solder paste onto the chip.

[0004] Chinese Patent Application No.: CN201610485827.5, Title: Solder Paste Scraper Pressure Testing Device and Detection Method Based on Strain Gauge, this application provides a method based on pressure sensing to determine the contact between the scraper and the steel mesh. Although this method can achieve the desired effect, the strain gauge will lose its sensitivity after long-term use, resulting in the need for long-term maintenance. In addition, the area available for printing is small, and the electrical components occupy a large space. However, if a traditional mechanical structure is used for printing, in order to ensure that the impact of gaps is reduced, a soft rubber strip is often provided at the bottom of the scraper. When gaps occur, the rubber strip can fill the gaps. However, the rubber strip will corrode due to long-term contact with the solder paste, requiring workers to regularly maintain and replace the rubber strip.

[0005] In addition to the problem of the gap between the scraper and the steel mesh mentioned above, when in use, after each steel mesh is fixed, the bottom of the steel mesh is horizontal, but sometimes the top of the steel mesh will be slightly tilted. The main reasons for this tilt problem are: 1. When the steel mesh is processed, in order to meet the flatness of the bottom, the flatness will be slightly unsatisfactory when processing the top; 2. Long-term contact and wear between the scraper and the steel mesh will cause the steel mesh to tilt.

[0006] Therefore, it is necessary to design a BGA chip solder paste printing device that can solve the problem of the gap between the scraper and the steel mesh and the problem of the tilt of the top of the steel mesh. Summary of the Invention

[0007] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a BGA chip solder paste printing device that can solve the problem of the gap between the scraper and the steel mesh, and can also solve the problem of the tilt of the top of the steel mesh.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the present invention provides a BGA chip solder paste printing device, including an angle adjustment mechanism, a pull-up switching mechanism, a synchronous locking mechanism, a rotating support, a mounting seat, an electric slide, a front scraper, a rear scraper, a hinged rod and a steel mesh. The steel mesh is detachably mounted on the equipment frame, the front scraper and the rear scraper are located above the steel mesh, the mounting seat is located between the front scraper and the rear scraper, the front scraper and the rear scraper are slidably connected to the mounting seat, and the mounting seat is fixedly mounted on the angle adjustment mechanism. The angle adjustment mechanism is used to adjust the angle of the mounting seat relative to the top of the steel mesh. Side slide rails are provided on the side of the mounting seat, and the rotating support can be vertically slidably mounted on the side. The middle part of the slide rail and the hinged rod 1 is hinged to the rotating support, a transmission slide column 1 is fixedly provided on one side of the rear scraper, a waist-shaped slide groove 1 is provided on the hinged rod 1 and is slidably connected to the transmission slide column 1, a transmission slide column 2 is fixedly provided on one side of the front scraper, a waist-shaped slide groove 2 is provided on the hinged rod 1 and is slidably connected to the transmission slide column 2, the front scraper is used to squeeze the solder paste along the steel mesh onto the chip, the electric slide is fixedly installed on the equipment frame, the slide seat of the electric slide is fixedly connected to the angle adjustment mechanism through the displacement mounting frame, the lifting switching mechanism is fixedly installed on the displacement mounting frame, the working end of the lifting switching mechanism is hinged to the rear scraper, and the lifting switching mechanism is used to drive the rear scraper up and down to slide along the mounting seat;

[0009] When the rear scraper is pulled upward, the rotary support will initially fit into the bottom of the side rail due to gravity;

[0010] After the bottom of the front scraper is in contact with the top of the steel mesh, the hinged rod drives the rotating support to slide upward along the side slide rail, and the synchronous locking mechanism is fixedly installed on the front scraper. The synchronous locking mechanism is used to tighten the rear scraper.

[0011] Preferably, the angle adjustment mechanism includes a pulling mechanism, a clamp, a sliding column, a fixed column and a pressure sensor. The pulling mechanism is fixedly installed on the displacement mounting frame. The pulling mechanism includes a displacement plate that can move vertically. The fixed column is fixedly installed on the bottom of one end of the displacement plate. The pressure sensor is fixedly installed on the middle of the fixed column and is used to sense the contact between the bottom of the fixed column and the top of the steel mesh. The sliding column can be vertically slidably installed on the other end of the displacement plate. The top of the sliding column is fixedly provided with a fixed plate, one side of the mounting seat is fixedly provided with a hinged plate, and the other side of the mounting seat is fixedly provided with a sliding rod. The end of the hinged plate is hinged to the middle of the sliding column, and a waist-shaped slide groove three is provided on the sliding rod. The fixed column is provided with a transmission sliding column three that is slidably connected to the waist-shaped slide groove three. The clamp is fixedly installed on the frame of the pulling mechanism, and the clamp is used to clamp and fix the fixed plate.

[0012] Preferably, the synchronous locking mechanism includes an inner push mechanism fixedly mounted on the front scraper and two locks, the inner push mechanism is transmission-connected to the two locks, each locker includes a slide post 2, a guide plate, an extrusion friction block and a contact plate, the guide plate is fixedly mounted on the front scraper, the contact plate is fixedly mounted on the rear scraper, the slide post 2 is slidingly connected to the guide plate, the extrusion friction block is fixedly mounted on one end of the slide post 2, and the inner push mechanism is transmission-connected to the other end of the slide post 2.

[0013] Preferably, the inward pushing mechanism includes a lifting cylinder, a hinged rod 2 and a connecting rod. The lifting cylinder is fixedly mounted on the front scraper. The connecting rod is fixedly connected to the two sliding columns 2. One end of the hinged rod 2 is hinged to the output end of the lifting cylinder, and the other end of the hinged rod 2 is hinged to the connecting rod.

[0014] Preferably, the lifting switching mechanism includes a pneumatic slide and a hinged rod three, the pneumatic slide is fixedly mounted on the displacement mounting frame, one end of the hinged rod three is hinged to the bottom of the pneumatic slide, and the other end of the hinged rod three is hinged to the top of the rear scraper.

[0015] Preferably, guide rails are fixedly provided on both sides of the mounting seat, and sliders are provided on the side of the rear scraper and the front scraper close to the mounting seat.

[0016] Preferably, the angle adjustment mechanism also includes an extrusion spring sleeved on the outer edge of the slide column, and a limit ring is fixedly provided on the outer edge of the slide column. One end of the extrusion spring contacts the displacement plate, and the other end of the extrusion spring contacts the limit ring.

[0017] Preferably, the lifting mechanism also includes an electric push rod and two sliding columns three. The two sliding columns three can be vertically slidably installed on the displacement mounting frame. The electric push rod is fixedly installed on the displacement mounting frame. The output end of the electric push rod is fixedly connected to the displacement plate, and one end of the two sliding columns three is fixedly connected to the displacement plate.

[0018] The beneficial effect of the present invention is that the BGA chip solder paste printing device can automatically adjust the angle of the mounting seat through a synchronous locking mechanism, so that the bottom of the front scraper and the rear scraper can fit with the top of the steel mesh, solving the problem of the tilt of the top of the steel mesh.

[0019] And the rotating support can slide vertically upward, so that after the front scraper contacts the steel mesh, there is still a distance to make up for the gap between the scraper and the steel mesh, ensuring that the scraper can fit the steel mesh. The whole process does not use electric control adjustment and can adapt to steel meshes with different gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention in an installed state.

[0022] Figure 2 for Figure 1 A partial enlarged view of point A.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention.

[0024] Figure 4 It is a schematic diagram of the partial three-dimensional structure decomposition of the present invention.

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the angle adjustment mechanism.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the synchronous locking mechanism.

[0027] Explanation of reference numerals: 1-angle adjustment mechanism; 1a-lifting mechanism; 1a1-displacement plate; 1a2-electric push rod; 1a3-sliding column three; 1b-clamp; 1c-sliding column one; 1c1-fixing plate; 1c2-limiting ring; 1d-fixing column; 1e-extrusion spring; 1f-pressure sensor; 1h-sliding rod; 1j-hinge plate; 2-lifting switching mechanism; 2a-pneumatic slide; 2b-hinge rod three; 3 -synchronous locking mechanism; 3a-slide column 2; 3b-guide plate; 3c-extrusion friction block; 3d-contact plate; 3e-inward push mechanism; 3e1-lifting cylinder; 3e2-hinge rod 2; 3e3-connecting rod; 4-rotating support; 5-mounting seat; 5a-guide rail; 5b-side slide rail; 6-electric slide; 7-front scraper; 8-rear scraper; 9-hinge rod 1; 10-steel mesh; 11-displacement mounting frame; 12-slider. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Embodiment: The present invention provides a BGA chip solder paste printing device, such as Figure 1-4 As shown, it includes an angle adjustment mechanism 1, a lifting switching mechanism 2, a synchronous locking mechanism 3, a rotating support 4, a mounting seat 5, an electric slide 6, a front scraper 7, a rear scraper 8, a hinged rod 9 and a steel mesh 10. The steel mesh 10 is detachably mounted on the equipment frame. The front scraper 7 and the rear scraper 8 are located above the steel mesh 10. The mounting seat 5 is located between the front scraper 7 and the rear scraper 8. The front scraper 7 and the rear scraper 8 are slidably connected to the mounting seat 5. The mounting seat 5 is fixedly mounted on the angle adjustment mechanism 1. The angle The adjustment mechanism 1 is used to adjust the angle of the mounting seat 5 relative to the top of the steel mesh 10. When the angle of the mounting seat 5 is adjusted, the angles of the rear scraper 8 and the front scraper 7 are also adjusted, so that when the angle of the top of the steel mesh 10 changes due to wear, the bottoms of the front scraper 7 and the rear scraper 8 can still keep in contact with the top of the steel mesh 10. The side of the mounting seat 5 is provided with a side slide rail 5b, and the rotating support 4 can be vertically slidably installed on the side slide rail 5b. The middle part of the hinge rod 9 is hinged to the rotating support 4, and the rear scraper The front scraper 7 is fixedly provided with a transmission slide post 1 on one side of the knife 8, and a waist-shaped slide groove 1 is provided on the hinge rod 19 for sliding connection with the transmission slide post 1. A transmission slide post 2 is fixedly provided on one side of the front scraper 7, and a waist-shaped slide groove 2 is provided on the hinge rod 19 for sliding connection with the transmission slide post 2. The front scraper 7 is used to squeeze the solder paste along the steel mesh 10 onto the BGA chip. The electric slide 6 is fixedly installed on the equipment frame, and the slide seat of the electric slide 6 is fixedly connected to the angle adjustment mechanism 1 through the displacement mounting frame 11. The electric slide 6 can drive the angle adjustment mechanism 1 to move horizontally through the displacement mounting frame 11, thereby driving the front scraper 7 and the rear scraper 8 to move horizontally on the steel mesh 10. The lifting switching mechanism 2 is fixedly installed on the displacement mounting frame 11, and the working end of the lifting switching mechanism 2 is hinged to the rear scraper 8, so that when the angle of the rear scraper 8 changes, the lifting switching mechanism 2 can still ensure that it is connected to the rear scraper 8. The lifting switching mechanism 2 is used to drive the rear scraper 8 up and down to slide along the mounting seat 5;

[0030] It should be explained that, in the process of the rear scraper 8 being pulled upward, the rotary support 4 will initially fit in contact with the bottom of the side slide rail 5b due to the effect of gravity;

[0031] After the bottom of the front scraper 7 is in contact with the top of the steel mesh 10, as the rear scraper 8 continues to move upward, the front scraper 7 cannot move upward, and the hinge rod 19 drives the rotating support 4 to slide upward along the side slide rail 5b. This ensures that if there is a gap between the front scraper 7 and the steel mesh 10, the bottom of the front scraper 7 can still be in contact with the steel mesh 10. If there is a gap between the rear scraper 8 and the steel mesh 10, it will not affect the use of the entire device and will have a better effect. Because if there is a gap between the rear scraper 8 and the bottom of the steel mesh 10, when the rear scraper 8 pushes the solder paste to retract and reset, a thin layer of solder paste can be left on the top of the steel mesh 10 in advance. The solder paste left in advance can prevent subsequent air from being squeezed into the holes of the steel mesh 10, and can also prevent the solder paste in the holes from drying and clogging.

[0032] The synchronous locking mechanism 3 is fixedly mounted on the front scraper 7 and is used to tighten the rear scraper 8. When the front scraper 7 and the rear scraper 8 need to be raised simultaneously, the synchronous locking mechanism 3 can be pushed out to contact the rear scraper 8 to achieve a fixed connection between the front scraper 7 and the rear scraper 8. Subsequently, the rear scraper 8 can be pulled upward by the pull-up switching mechanism 2 to achieve synchronous lifting of the front scraper 7 and the rear scraper 8.

[0033] If the angle of the mounting base 5 is adjusted by electric control, the whole process will take a long time, and the accuracy of the electric control adjustment is difficult to meet the needs of the situation for such a small angle gap. Figure 5As shown, the angle adjustment mechanism 1 includes a pulling mechanism 1a, a clamp 1b, a sliding column 1c, a fixed column 1d and a pressure sensor 1f. The pulling mechanism 1a is fixedly installed on the displacement mounting frame 11. The pulling mechanism 1a includes a vertically movable displacement plate 1a1. The fixed column 1d is fixedly installed at the bottom of one end of the displacement plate 1a1. The pressure sensor 1f is fixedly installed in the middle of the fixed column 1d and is used to sense the contact between the bottom of the fixed column 1d and the top of the steel mesh 10. When the bottom of the fixed column 1d contacts the top of the steel mesh 10, the pressure sensor 1f will sense the pressure signal. When the signal is received, the pressure sensor 1f transmits a signal to the controller, which instructs the lifting mechanism 1a to stop pushing the displacement plate 1a1 downward. Sliding column 1c is vertically slidably mounted on the other end of the displacement plate 1a1. A fixed plate 1c1 is fixed to the top of sliding column 1c. A hinged plate 1j is fixed to one side of the mounting base 5, and a sliding rod 1h is fixed to the other side of the mounting base 5. The end of hinged plate 1j is hinged to the middle of sliding column 1c. Sliding rod 1h is provided with a waist-shaped groove 3, and fixed column 1d is provided with a transmission sliding column 3 slidably connected to the waist-shaped groove 3. The bottom of sliding column 1c can be coplanar with fixed column 1d or lower than the bottom of fixed column 1d. When the fixed column 1d contacts the steel mesh 10, if the top of the steel mesh 10 is tilted upward toward the sliding column 1c, the sliding column 1c will also contact the steel mesh 10, and the inclined surface of the steel mesh 10 will be the same angle as the hinge plate 1j. This means that the tilt angles of the front scraper 7 and the rear scraper 8 are also adjusted synchronously through the mounting base 5, achieving adaptive angle adjustment. After the angle adjustment is completed, in order to limit the tilt amplitude of the mounting base 5, the clamp 1b is fixedly installed on the frame of the lifting mechanism 1a. The clamp 1b is used to clamp and secure the fixed plate 1c1. That is, after the fixed plate 1c1 is clamped, the sliding column 1c cannot move, thus achieving the positioning and fixation of the mounting base 5.

[0034] like Figure 6 As shown, to achieve locking between the front scraper 7 and the rear scraper 8, the synchronous locking mechanism 3 includes an inner push mechanism 3e fixedly mounted on the front scraper 7 and two lockers. The inner push mechanism 3e is in transmission connection with the two lockers. Each locker includes a second slide post 3a, a guide plate 3b, an extrusion friction block 3c, and a contact plate 3d. The guide plate 3b is fixedly mounted on the front scraper 7, and the contact plate 3d is fixedly mounted on the rear scraper 8. The second slide post 3a is in sliding connection with the guide plate 3b. The extrusion friction block 3c is fixedly mounted on one end of the second slide post 3a, and the inner push mechanism 3e is in transmission connection with the other end of the second slide post 3a. The inner push mechanism 3e is driven to work, so that the inner push mechanism 3e pushes the second slide post 3a, causing the extrusion friction block 3c to contact and lock with the contact plate 3d, thereby achieving locking between the front scraper 7 and the rear scraper 8. On the contrary, the inner pushing mechanism 3e pulls the extrusion friction block 3c to separate from the contact plate 3d, thereby achieving unlocking between the front scraper 7 and the rear scraper 8.

[0035] like Figure 6 As shown, the inward pushing mechanism 3e includes a lifting cylinder 3e1, an articulated rod 3e2, and a connecting rod 3e3. The lifting cylinder 3e1 is fixedly mounted on the front scraper 7. The connecting rod 3e3 is fixedly connected to the two sliding posts 3a. One end of the articulated rod 3e2 is hinged to the output end of the lifting cylinder 3e1, and the other end of the articulated rod 3e2 is hinged to the connecting rod 3e3. By pulling the lifting cylinder 3e1 to move the articulated rod 3e2 vertically, the articulated rod 3e2 pulls the connecting rod 3e3 inward or outward, thereby driving the two sliding posts 3a to move.

[0036] like Figure 3 As shown, the lifting and switching mechanism 2 includes a pneumatic slide 2a and an articulated rod 3 2b. The pneumatic slide 2a is fixedly mounted on the displacement mounting frame 11. One end of the articulated rod 3 2b is hinged to the bottom of the pneumatic slide 2a, and the other end of the articulated rod 3 2b is hinged to the top of the rear scraper 8. During the angle adjustment of the rear scraper 8, the angle of the articulated rod 3 2b will also change accordingly. After the angle adjustment is completed, the articulated rod 3 2b will no longer change, and the pneumatic slide 2a can then pull the rear scraper 8 vertically via the articulated rod 3 2b.

[0037] In order to achieve this, the front scraper 7 and the rear scraper 8 are slidably connected to the mounting base 5, as shown in FIG. Figure 4 As shown, guide rails 5a are fixedly provided on both sides of the mounting seat 5, and sliders 12 are provided on the side of the rear scraper 8 and the front scraper 7 close to the mounting seat 5. Through the sliding connection between the slider 12 and the guide rails 5a, the angles of the front scraper 7 and the rear scraper 8 can be changed along with the mounting seat 5.

[0038] like Figure 5 As shown, the angle adjustment mechanism 1 also includes a compression spring 1e sleeved around the outer edge of the slide post 1c. A limit ring 1c2 is fixed to the outer edge of the slide post 1c. One end of the compression spring 1e contacts the displacement plate 1a1, while the other end of the compression spring 1e contacts the limit ring 1c2. The compression spring 1e allows the slide post 1c to descend more quickly after the clamp 1b releases the slide post 1c, preventing friction between the slide post 1c and the displacement plate 1a1 from hindering its downward movement.

[0039] like Figure 5As shown, the lifting mechanism 1a also includes an electric push rod 1a2 and two sliding posts 1a3. The two sliding posts 1a3 are mounted vertically on the displacement mounting frame 11. The electric push rod 1a2 is fixedly mounted on the displacement mounting frame 11. The output end of the electric push rod 1a2 is fixedly connected to the displacement plate 1a1, and one end of the two sliding posts 1a3 is fixedly connected to the displacement plate 1a1. The electric push rod 1a2 is controlled by a controller to move the displacement plate 1a1 up and down. The sliding posts 1a3 are used to guide the vertical movement of the displacement plate 1a1.

[0040] When in use, the synchronous locking mechanism 3 is first moved downward until it contacts the top of the steel mesh 10, and finally the mounting seat 5 and the steel mesh 10 are adjusted to a parallel state.

[0041] Before the above adjustment, the synchronous locking mechanism 3 locks the front scraper 7 and the rear scraper 8, and the front scraper 7 and the rear scraper 8 are pulled upward by the lifting switching mechanism 2 to separate them from the steel mesh 10. After the adjustment is completed, the synchronous locking mechanism 3 is released, allowing the front scraper 7 to slide down by gravity, and the rotating support 4 also slides down in the side slide rail 5b.

[0042] The rear scraper 8 is pushed up and down by the lifting switching mechanism 2, so that the front scraper 7 and the rear scraper 8 can switch positions alternately. In the process of the rear scraper 8 sliding upward, after the front scraper 7 contacts the top of the steel mesh 10, the rotating support 4 can also move upward, so that the rotating support 4 is separated from the bottom of the side slide rail 5b, ensuring that the front scraper 7 can contact the top of the steel mesh 10.

[0043] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A BGA chip solder paste printing device, characterized in that: The invention comprises an angle adjustment mechanism (1), a lifting switching mechanism (2), a synchronous locking mechanism (3), a rotating support (4), a mounting seat (5), an electric slide (6), a front scraper (7), a rear scraper (8), a hinged rod (9) and a steel mesh (10), wherein the steel mesh (10) is detachably mounted on the equipment frame, the front scraper (7) and the rear scraper (8) are located above the steel mesh (10), the mounting seat (5) is located between the front scraper (7) and the rear scraper (8), the front scraper (7) and the rear scraper (8) are slidably connected to the mounting seat (5), the mounting seat (5) is fixedly mounted on the angle adjustment mechanism (1), the angle adjustment mechanism (1) is used to adjust the angle of the mounting seat (5) relative to the top of the steel mesh (10), a side slide rail (5b) is provided on the side of the mounting seat (5), the rotating support (4) can be vertically slidably mounted on the side slide rail (5b), the hinged rod (9) is hinged and the mounting seat (5 ... The middle part of the rod (9) is hinged to the rotating support (4), a transmission slide column (1) is fixedly provided on one side of the rear scraper (8), a waist-shaped slide groove (1) is provided on the hinged rod (9) and is slidably connected to the transmission slide column (1), a transmission slide column (2) is fixedly provided on one side of the front scraper (7), a waist-shaped slide groove (2) is provided on the hinged rod (9) and is slidably connected to the transmission slide column (2), the front scraper (7) is used to squeeze the solder paste along the steel mesh (10) onto the BGA chip, the electric slide (6) is fixedly installed on the equipment frame, the slide seat of the electric slide (6) is fixedly connected to the angle adjustment mechanism (1) through the displacement mounting frame (11), the lifting switching mechanism (2) is fixedly installed on the displacement mounting frame (11), the working end of the lifting switching mechanism (2) is hinged to the rear scraper (8), and the lifting switching mechanism (2) is used to drive the rear scraper (8) up and down to slide along the mounting seat (5); When the rear scraper (8) is pulled upward, the rotating support (4) will initially fit into the bottom of the side slide rail (5b) due to the action of gravity; After the bottom of the current scraper (7) is in contact with the top of the steel mesh (10), the hinged rod (9) drives the rotating support (4) to slide upward along the side slide rail (5b); The synchronous locking mechanism (3) is fixedly mounted on the front scraper (7), and the synchronous locking mechanism (3) is used to tighten the rear scraper (8); The angle adjustment mechanism (1) includes a pulling mechanism (1a), a clamp (1b), a sliding column (1c), a fixed column (1d) and a pressure sensor (1f). The pulling mechanism (1a) is fixedly mounted on a displacement mounting frame (11). The pulling mechanism (1a) includes a displacement plate (1a1) that can move vertically. The fixed column (1d) is fixedly mounted on the bottom of one end of the displacement plate (1a1). The pressure sensor (1f) is fixedly mounted on the middle of the fixed column (1d) and is used to sense the contact between the bottom of the fixed column (1d) and the top of the steel mesh (10). The sliding column (1c) can be vertically slidably mounted on the position At the other end of the moving plate (1a1), a fixed plate (1c1) is fixedly provided on the top of the sliding column (1c), a hinged plate (1j) is fixedly provided on one side of the mounting seat (5), and a sliding rod (1h) is fixedly provided on the other side of the mounting seat (5), the end of the hinged plate (1j) is hinged to the middle of the sliding column (1c), a waist-shaped sliding groove three is provided on the sliding rod (1h), and a transmission sliding column three slidably connected to the waist-shaped sliding groove three is provided on the fixed column (1d), and a clamp (1b) is fixedly installed on the frame of the lifting mechanism (1a), and the clamp (1b) is used to clamp and fix the fixed plate (1c1); The angle adjustment mechanism (1) further includes an extrusion spring (1e) sleeved on the outer edge of the sliding column (1c), a limit ring (1c2) fixedly provided on the outer edge of the sliding column (1c), one end of the extrusion spring (1e) abuts against the displacement plate (1a1), and the other end of the extrusion spring (1e) abuts against the limit ring (1c2); The lifting mechanism (1a) further includes an electric push rod (1a2) and two sliding columns (1a3). The two sliding columns (1a3) are vertically slidably mounted on the displacement mounting frame (11). The electric push rod (1a2) is fixedly mounted on the displacement mounting frame (11). The output end of the electric push rod (1a2) is fixedly connected to the displacement plate (1a1), and one end of the two sliding columns (1a3) is fixedly connected to the displacement plate (1a1).

2. A BGA chip solder paste printing device as claimed in claim 1, characterized in that: The synchronous locking mechanism (3) includes an inner push mechanism (3e) fixedly mounted on the front scraper (7) and two lockers. The inner push mechanism (3e) is transmission-connected to the two lockers. Each locker includes a slide column (3a), a guide plate (3b), an extrusion friction block (3c) and a contact plate (3d). The guide plate (3b) is fixedly mounted on the front scraper (7), the contact plate (3d) is fixedly mounted on the rear scraper (8), the slide column (3a) is slidingly connected to the guide plate (3b), the extrusion friction block (3c) is fixedly mounted on one end of the slide column (3a), and the inner push mechanism (3e) is transmission-connected to the other end of the slide column (3a).

3. A BGA chip solder paste printing device as claimed in claim 2, characterized in that: The inner push mechanism (3e) includes a lifting cylinder (3e1), a hinged rod (3e2) and a connecting rod (3e3). The lifting cylinder (3e1) is fixedly mounted on the front scraper (7). The connecting rod (3e3) is fixedly connected to the two sliding columns (3a). One end of the hinged rod (3e2) is hinged to the output end of the lifting cylinder (3e1), and the other end of the hinged rod (3e2) is hinged to the connecting rod (3e3).

4. A BGA chip solder paste printing device as claimed in claim 1, characterized in that: The lifting switching mechanism (2) includes a pneumatic slide (2a) and a hinged rod (2b). The pneumatic slide (2a) is fixedly mounted on a displacement mounting frame (11). One end of the hinged rod (2b) is hinged to the bottom of the pneumatic slide (2a), and the other end of the hinged rod (2b) is hinged to the top of the rear scraper (8).

5. A BGA chip solder paste printing device as claimed in claim 1, characterized in that: Guide rails (5a) are fixedly provided on both sides of the mounting seat (5), and sliders (12) are provided on the side of the rear scraper (8) and the front scraper (7) close to the mounting seat (5).

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