Scraper assembly and steel mesh printing device

Abstract

The utility model discloses a scraper assembly and a steel screen printing device, and relates to the technical field of semiconductor manufacturing equipment.The scraper assembly comprises a first scraper and a second scraper which are arranged in the first direction in a spaced mode, and the first scraper and the second scraper are structurally symmetrical with the midperpendicular of the connecting line of the first scraper and the second scraper as the center; the first scraper comprises a first blade, a second blade and a third blade which are sequentially arranged, the second blade is far away from the second scraper relative to the first blade, a plurality of first scraping grooves are formed in the edge side of the first blade, a plurality of second scraping grooves are formed in the edge side of the second blade, and the first scraping grooves and the second scraping grooves are arranged in a staggered mode. According to the scraper assembly and the steel mesh printing device, abrasion of the scraper assembly can be reduced, and the service life of the scraper assembly is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of semiconductor manufacturing equipment, and in particular to a scraper assembly and a steel screen printing device. Background Art

[0002] Stencil printing technology is widely used in the production and manufacturing of printed circuit boards. The main process of stencil printing is to use a scraper to push the printing raw materials (such as solder paste, glue, ink, silicone grease, etc.) horizontally on the steel mesh so that a certain amount of printing raw materials can be transferred through the hollow steel mesh to the surface to be printed under the steel mesh, thereby forming the expected pattern. Among them, the solder paste printer is an important actuator in the SMT industry. It is responsible for accurately printing the solder paste on the circuit board through the molded steel mesh during the printed circuit board processing.

[0003] The scraper of SMT printer is used to print solder paste or red glue on printed circuit boards. Since there are a large number of solder balls in the solder paste, the scraper is easily damaged by friction with the solder balls during the scraping process, which greatly reduces the service life of the scraper. Utility Model Content

[0004] The purpose of the present application is to provide a scraper assembly and a steel screen printing device, which can reduce the wear of the scraper assembly and increase the life of the scraper assembly.

[0005] On the one hand, an embodiment of the present application provides a scraper assembly, including a first scraper and a second scraper arranged at intervals along a first direction, with the first scraper and the second scraper having symmetrical structures with the perpendicular bisector of the line connecting the first scraper and the second scraper as the center, the first scraper including a first blade, a second blade and a third blade arranged in sequence, the second blade being away from the second scraper relative to the first blade, a plurality of first scraping grooves being arranged on the edge side of the first blade, a plurality of second scraping grooves being arranged on the edge side of the second blade, and the first scraping grooves and the second scraping grooves being staggered.

[0006] As an implementable manner, the first blade, the second blade and the third blade are elastic blades, and the rigidity of the first blade and the second blade is greater than the rigidity of the third blade.

[0007] As an practicable manner, the edges of the cross sections of the first scraping groove and the second scraping groove are arc-shaped to match the outer edges of the solder balls in the solder paste.

[0008] As an implementable manner, the first blade, the second blade and the third blade are parallel to each other, and all have a preset angle with the first direction, and the preset angle is less than 90°.

[0009] As an implementable manner, the lengths occupied by the first blade, the second blade and the third blade in the second direction gradually increase, and the first direction is perpendicular to the second direction.

[0010] As an implementable manner, the rigidities of the first blade, the second blade and the third blade are gradually reduced.

[0011] As an implementable manner, the blade thicknesses of the first blade, the second blade and the third blade are gradually reduced.

[0012] As an implementable manner, the center line of the second scraping groove is colinear with the center line of the side wall between two adjacent first scraping grooves.

[0013] As an implementable manner, the first blade, the second blade and the third blade are connected via a connecting portion, and the first blade, the second blade and the third blade are integrally formed with the connecting portion.

[0014] On the other hand, an embodiment of the present application provides a steel screen printing device, including a moving component and the above-mentioned scraper assembly, wherein the moving component is connected to the first scraper and the second scraper of the scraper assembly, and when the moving component drives the first scraper and the second scraper to move in the direction of the second scraper, the second scraper is controlled to move away from the operating plane along a third direction.

[0015] The beneficial effects of the embodiments of the present application include:

[0016] The scraper assembly provided in the present application includes a first scraper and a second scraper arranged at intervals along a first direction. The first scraper and the second scraper are symmetrical in structure with the perpendicular bisector of the line connecting the first scraper and the second scraper as the center. The first scraper moves toward the direction of the second scraper to scrape the solder paste to the edge of the screen, and the second scraper moves toward the direction of the first scraper to scrape the solder paste to the edge of the screen to fill the solder paste into the tin leakage holes on the screen. The first scraper includes a first blade, a second blade and a third blade which are arranged in sequence. The second blade is away from the second scraper relative to the first blade. A plurality of first scraping grooves are arranged on the edge side of the first blade. When the first scraper and the second scraper scrape the solder paste, the first blade contacts the solder paste first. Due to the existence of the first scraping grooves, the solder balls in the solder paste pass through the first scraping grooves. A plurality of second scraping grooves are arranged on the edge side of the second blade, and the solder balls in the paste pass through the first scraping grooves. The friction of the solder balls on the first blade and the second blade is avoided. The first scraping groove and the second scraping groove are staggered, so that more solder paste is filled in the tin leakage hole. The edge side of the third blade is a plane, which scrapes the remaining solder paste to the edge of the screen. In this way, the wear of the solder balls and the third blade is reduced. Therefore, the scraper assembly provided in the embodiment of the present application can reduce the wear of the scraper assembly and increase the life of the scraper assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 One of the structural schematic diagrams of a scraper assembly provided in an embodiment of the present application;

[0019] Figure 2 A second structural schematic diagram of a scraper assembly provided in an embodiment of the present application;

[0020] Figure 3 A third structural schematic diagram of a scraper assembly provided in an embodiment of the present application;

[0021] Figure 4 This is a fourth structural schematic diagram of a scraper assembly provided in an embodiment of the present application.

[0022] Icon: 100 - scraper assembly; 110 - first scraper; 120 - second scraper; 131 - first blade; 132 - second blade; 133 - third blade; 134 - first scraping groove; 135 - second scraping groove; 136 - connecting part. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] The steel screen printing device is used for printing solder paste and patch adhesive in the electronic assembly industry. It is a key step in surface mount technology and hybrid technology assembly. Specifically, a metal material is used to make a screen, and a plurality of tin leakage holes are formed on the screen. Solder paste is set on the screen, and the scraper assembly moves back and forth on the screen to move the solder paste on the screen, so that the solder paste passes through the tin leakage holes to reach the corresponding position, thereby realizing the arrangement of the solder paste. Since there are a large number of solder balls in the solder paste, the solder balls have a large hardness. During the scraping process of the scraper assembly, the solder balls rub against the scraper assembly and damage the scraper, which reduces the service life of the scraper.

[0028] The present application embodiment provides a scraper assembly 100, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, it includes a first scraper 110 and a second scraper 120 arranged at intervals along a first direction. The first scraper 110 and the second scraper 120 are symmetrical in structure with the perpendicular bisector of the line connecting the first scraper 110 and the second scraper 120 as the center. The first scraper 110 includes a first blade 131, a second blade 132 and a third blade 133 arranged in sequence. The second blade 132 is away from the second scraper 120 relative to the first blade 131. A plurality of first scraping grooves 134 are arranged on the blade side of the first blade 131, and a plurality of second scraping grooves 135 are arranged on the blade side of the second blade 132. The first scraping grooves 134 and the second scraping grooves 135 are staggered.

[0029] The scraper assembly 100 provided in the embodiment of the present application is applied to a steel screen printing device, and the steel screen printing device includes a motion assembly connected to the scraper assembly 100, and the motion assembly drives the scraper assembly 100 to move, so as to scrape the solder paste and fill the solder paste into the tin leakage holes of the screen. Specifically, the scraper assembly 100 includes a first scraper 110 and a second scraper 120 arranged along a first direction, and the first scraper 110 and the second scraper 120 are relatively fixed in the horizontal direction. The first scraper 110 and the second scraper 120 can move in the vertical direction respectively. When the first scraper 110 and the second scraper 120 move in the direction of the second scraper 120, the second scraper 120 moves upward in the vertical direction and leaves the screen surface. At this time, the first scraper 110 presses against the surface of the screen and moves the solder paste toward the second scraper 120. at this time, the first scraper 110 moves upward in the vertical direction away from the surface of the screen, the second scraper 120 presses against the screen surface in the vertical direction downward and moves in the direction of the first scraper 110, scraping the solder paste in the direction of the first scraper 110 until the edge of the screen, and then the second scraper 120 moves upward in the vertical direction and leaves the screen surface, and the first scraper 110 presses against the screen surface in the vertical direction downward, and the cycle is repeated until the tin leakage holes are filled and the solder paste is filled.

[0030] In the above process, the first scraper 110 and the second scraper 120 are against the plate surface to scrape the solder paste. In order to prevent the solder balls in the surface solder paste from damaging the scraper assembly 100, the first scraper 110 and the second scraper 120 are respectively configured as a first blade 131, a second blade 132 and a third blade 133, wherein the first blade 131, the second blade 132 and the third blade 133 of the first scraper 110 are configured in a direction away from the second scraper 120, and the first blade 131, the second blade 132 and the third blade 133 of the second scraper 120 are configured in a direction away from the first scraper 110. When the first scraper 110 is in the process of scraping the solder paste, the first blade 131 first contacts the solder paste, and a plurality of first scraping grooves 134 are arranged on the blade side of the first blade 131. The solder balls in the solder paste have a certain volume, and when they contact the side walls of the first scraping groove 134, they will be blocked and rotate along the side walls to the first scraping groove 134. Since the first scraping groove 134 has The vacant space allows the solder ball to pass through the first scraping groove 134. Similarly, a plurality of second scraping grooves 135 are arranged on the inner side of the heat of the second blade 132, so that the solder ball passes through the second scraping groove 135. Since there is a certain gap between the first blade 131 and the second blade 132, and between the second blade 132 and the third blade 133, part of the solder paste is gradually filled in the tin leakage hole, and the scraping of the first blade 131 and the second blade 132 makes the amount of solder paste in contact with the third blade 133 very small. The blade side of the third blade 133 is a plane, and the remaining solder paste is scraped to the edge of the screen. In this way, the wear of the solder ball and the third blade 133 is reduced. The first scraping groove 134 and the second scraping groove 135 in the structure of the first blade 131 and the second blade 132 can reduce the direct friction between the first blade 131 and the second blade 132 and the solder ball. Therefore, the scraper assembly 100 provided in the embodiment of the present application can reduce the wear of the scraper assembly 100 and increase the life of the scraper assembly 100.

[0031] In addition, since the first scraper groove 134 and the second scraper groove 135 are staggered, the solder paste passing through the first scraper groove 134 contacts the side wall of the second scraper groove 135, so that the solder paste moves along the side wall of the second scraper groove 135 to the second scraper groove 135. During the movement, more solder paste is filled in the tin leakage hole.

[0032] It can be understood that the first scraping groove 134 extends along the moving direction of the first scraper 110 to allow the solder balls to pass through. Similarly, the second scraping groove 135 extends along the moving direction of the second scraper 120. Figure 1 The first scraping groove 134 and the second scraping groove 135 extend along the A direction, and the plurality of first scraping grooves 134 are arranged in a direction perpendicular to the A direction.

[0033] In practical applications, the stencil printing device may include one scraper assembly 100 or two scraper assemblies 100. When one scraper assembly 100 is included, the first scraper 110 and the second scraper 120 in one scraper assembly 100 are arranged along a first direction, and the first scraper 110 and the second scraper 120 are operated in time-sharing mode to achieve the laying of solder paste. One scraper assembly 100 can simplify the structure of the printing device and achieve the laying of solder paste conveniently and quickly; when two scraper assemblies 100 are included, the arrangement directions of the first scraper 110 and the second scraper 120 in the two scraper assemblies 100 are perpendicular to each other, and the four scrapers of the two groups of scraper assemblies 100 are operated in time-sharing mode to achieve the laying of solder paste, so that the solder paste can be scraped from four directions, avoiding the solder paste from leaking from two scrapers during multiple scraping processes, resulting in waste.

[0034] The scraper assembly 100 provided in the present application includes a first scraper 110 and a second scraper 120 spaced apart along a first direction. The first scraper 110 and the second scraper 120 are symmetrical in structure with the perpendicular bisector of the line connecting the first scraper 110 and the second scraper 120 as the center. The first scraper 110 moves toward the direction of the second scraper 120 to scrape the solder paste to the edge of the screen, and the second scraper 120 moves toward the direction of the first scraper 110 to scrape the solder paste to the edge of the screen to fill the solder paste into the tin leakage holes on the screen. The first scraper 110 includes a first blade 131, a second blade 132, and a third blade 133 which are arranged in sequence. The second blade 132 is relatively far away from the second scraper 120 relative to the first blade 131. A plurality of first scraping grooves 134 are arranged on the edge side of the first blade 131. When the first scraper 110 and the second scraper 120 scrape the solder paste, the first blade 131 first contacts the solder paste. Due to the existence of the first scraping grooves 134, the solder balls in the solder paste pass through the first scraping grooves 134. The edge side of the second blade 132 is arranged with a plurality of second scraping grooves 134. Scrape groove 135, the solder balls in the paste pass through the first scraper groove 134; the friction of the solder balls on the first blade 131 and the second blade 132 is avoided, the first scraper groove 134 and the second scraper groove 135 are staggered, so that more solder paste is filled in the tin leakage hole, and the blade side of the third blade 133 is flat, and the remaining solder paste is scraped to the edge of the screen, thus reducing the wear of the solder balls and the third blade 133. Therefore, the scraper assembly 100 provided in the embodiment of the present application can reduce the wear of the scraper assembly 100 and increase the life of the scraper assembly 100.

[0035] Optionally, the first blade 131 , the second blade 132 and the third blade 133 are elastic blades, and the rigidity of the first blade 131 and the second blade 132 is greater than the rigidity of the third blade 133 .

[0036] The first blade 131, the second blade 132 and the third blade 133 are elastic blades. When scraping the solder paste, the first blade 131, the second blade 132 and the third blade 133 will produce a certain deformation to avoid the first blade 131, the second blade 132 and the third blade 133 from hard contact with the screen, thereby avoiding wear between the blades and the screen and increasing the life of the scraper assembly 100.

[0037] In one possible implementation of the embodiment of the present application, Figure 4 As shown, the edges of the cross sections of the first scraping groove 134 and the second scraping groove 135 are arc-shaped to match the outer edges of the solder balls in the solder paste.

[0038] It can be seen from the above description that the first scraper groove 134 and the second scraper groove 135 are used to allow the tin balls in the solder paste to pass through. The tin balls are round. In the embodiment of the present application, the edges of the cross-sections of the first scraper groove 134 and the second scraper groove 135 are set to arc shapes, so that the side walls of the first scraper groove 134 and the second scraper groove 135 are cylindrical, matching the outer edges of the tin balls. This facilitates the passage of the tin balls through the first scraper groove 134 and the second scraper groove 135.

[0039] The curvature of the cross-sectional edge arc of the first scraping groove 134 and the second scraping groove 135 is not limited in the present embodiment, and those skilled in the art can set it specifically according to the outer edge of the solder ball in the solder paste. The shapes of the first scraping groove 134 and the second scraping groove 135 can be the same or different.

[0040] Optionally, the first blade 131 , the second blade 132 , and the third blade 133 are parallel to each other, and all have a preset angle with the first direction, and the preset angle is less than 90°.

[0041] The angles between the first blade 131, the second blade 132 and the third blade 133 and the first direction are less than 90°, so that when the first blade 131, the second blade 132 and the third blade 133 are scraping the solder paste, they have a preset angle with the screen, which facilitates the solder paste to move along the extension direction of the blade at the angle.

[0042] In one achievable manner of the embodiment of the present application, the lengths occupied by the first blade 131 , the second blade 132 and the third blade 133 in the second direction (vertical direction) gradually increase, and the first direction is perpendicular to the second direction.

[0043] In order to avoid the wear of the first blade 131 and the second blade 132 against the screen during movement, the embodiment of the present application gradually increases the length occupied by the first blade 131, the second blade 132 and the third blade 133 in the vertical direction. When the scraper assembly 100 is working, the distance between the first blade 131, the second blade 132 and the third blade 133 and the screen is gradually reduced, wherein the third blade 133 is against the screen, and there is a certain gap between the first blade 131 and the second blade 132 and the screen. In this way, the first blade 131 and the second blade 132 can reduce the friction against the screen while scraping the solder paste, thereby reducing the wear of the first blade 131 and the second blade 132.

[0044] It can be understood that the first blade 131 and the second blade 132 scrape part of the solder paste, and the third blade 133 scrapes the remaining solder paste.

[0045] Optionally, the rigidities of the first blade 131 , the second blade 132 , and the third blade 133 are gradually reduced.

[0046] Since there is a certain gap between the first blade 131, the second blade 132 and the screen, the rigidity of the first blade 131 and the second blade 132 can be set to be larger, so that friction is not generated and the scraping effect is improved.

[0047] In one achievable manner of the embodiment of the present application, the blade thicknesses of the first blade 131 , the second blade 132 , and the third blade 133 gradually decrease.

[0048] When the first blade 131, the second blade 132 and the third blade 133 are made of the same material, in order to gradually reduce the rigidity of the first blade 131, the second blade 132 and the third blade 133, the blade thickness of the first blade 131, the second blade 132 and the third blade 133 is gradually reduced.

[0049] Optionally, the center line of the second scraper groove 135 is colinear with the center line of the side wall between two adjacent first scraper grooves 134. Since the movement direction of the first scraper 110 is the same as the arrangement direction of the first blade 131 and the second blade 132, the solder paste passing through the first scraper groove 134 is located on the center line of the side wall between two adjacent second scraper grooves 135. In this way, the solder paste passing through the first scraper groove 134 is abutted against the side wall of the second scraper groove 135. At this time, the solder paste and the solder balls move along the side wall to the second scraper grooves 135 on both sides, thereby increasing the movement distance of the solder paste along the extension direction of the blade, so that the solder paste can fully cover the screen and fill the tin leakage holes.

[0050] In one implementable manner of the embodiment of the present application, the first blade 131 , the second blade 132 and the third blade 133 are connected by a connecting portion 136 , and the first blade 131 , the second blade 132 and the third blade 133 are integrally formed with the connecting portion 136 .

[0051] The first blade 131, the second blade 132, and the third blade 133 are connected by the connecting portion 136, so that the first blade 131, the second blade 132, and the third blade 133 are connected as one body. During the movement of the first scraper 110, the movement trajectories of the three blades are consistent, thereby improving the stability when scraping the solder paste. In addition, the embodiment of the present application also forms the first blade 131, the second blade 132, the third blade 133, and the connecting portion 136 as one body, which can increase the connection strength of the first blade 131, the second blade 132, and the third blade 133, and further improve the stability when scraping the solder paste.

[0052] The embodiment of the present application also discloses a steel screen printing device, including a motion component and the above-mentioned scraper assembly 100, the motion component is connected to the first scraper 110 and the second scraper 120 of the scraper assembly 100, and when the motion component drives the first scraper 110 and the second scraper 120 to move toward the second scraper 120, the second scraper 120 is controlled to move away from the operating plane along the third direction. The steel screen printing device includes the same structure and beneficial effects as the scraper assembly 100 in the above-mentioned embodiment. The structure and beneficial effects of the scraper assembly 100 have been described in detail in the above-mentioned embodiment, and will not be repeated here.

[0053] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A scraper assembly, characterized in that: It includes a first scraper and a second scraper arranged at intervals along a first direction, with the perpendicular bisector of the line connecting the first scraper and the second scraper as the center, the first scraper and the second scraper are symmetrical in structure, the first scraper includes a first blade, a second blade and a third blade arranged in sequence, the second blade is away from the second scraper relative to the first blade, a plurality of first scraping grooves are arranged on the edge side of the first blade, a plurality of second scraping grooves are arranged on the edge side of the second blade, and the first scraping grooves and the second scraping grooves are staggered.

2. The scraper assembly according to claim 1, characterized in that: The first blade, the second blade and the third blade are elastic blades, and the rigidity of the first blade and the second blade is greater than that of the third blade.

3. The scraper assembly according to claim 1, characterized in that: The edges of the cross sections of the first scraping groove and the second scraping groove are arc-shaped to match the outer edges of the solder balls in the solder paste.

4. The scraper assembly according to claim 1, characterized in that: The first blade, the second blade and the third blade are parallel to each other and have a preset angle with the first direction, and the preset angle is less than 90°.

5. The scraper assembly according to claim 1, characterized in that: Lengths occupied by the first blade, the second blade, and the third blade in a second direction gradually increase, and the first direction is perpendicular to the second direction.

6. The scraper assembly according to claim 2, characterized in that: The rigidities of the first blade, the second blade, and the third blade are gradually reduced.

7. The scraper assembly according to claim 6, characterized in that: The blade thicknesses of the first blade, the second blade, and the third blade gradually decrease.

8. The scraper assembly according to claim 1, characterized in that: The center line of the second scraping groove is collinear with the center line of the side wall between two adjacent first scraping grooves.

9. The scraper assembly according to claim 1, characterized in that: The first blade, the second blade and the third blade are connected via a connecting portion, and the first blade, the second blade and the third blade are integrally formed with the connecting portion.

10. A steel screen printing device, characterized in that: It includes a motion component and a scraper assembly as described in any one of claims 1 to 9, wherein the motion component is connected to a first scraper and a second scraper of the scraper assembly, and when the motion component drives the first scraper and the second scraper to move toward the second scraper, the second scraper is controlled to move away from an operating plane along a third direction.

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