SMT printing machine steel mesh fixing device

Abstract

The utility model belongs to the technical field of SMT printing machines, and particularly relates to an SMT printing machine steel mesh fixing device which comprises an outer frame, and the inner side wall of the outer frame is rotationally connected with a pair of bidirectional lead screws. A supporting plate supports the bottom of a screen frame, a threaded rod is rotated to drive an adjusting block to slide up and down, the height of a pressing block is adjusted, a rotating rod is rotated through a handle, a driving chain wheel is matched with a chain and a driven chain wheel, two bidirectional lead screws are synchronously driven, sliding blocks are made to get close to each other, and a longitudinal clamping plate is pushed through a connecting rod to clamp and fix the screen frame in the longitudinal direction; when the sliding block moves, the two transverse clamping plates are driven to get close to each other, the transverse clamping plates slide in the sliding grooves, the screen frame is clamped and fixed in the transverse direction, the pressing block is matched with the supporting plate to clamp the screen frame up and down, friction force generated during tin brushing is difficult to push the sliding block, deviation is not prone to occurring, limitation can be relieved only by rotating the two-way lead screw reversely during disassembly, and rapid disassembly and assembly are convenient. And synchronous moving and clamping are achieved, alignment to the center position is facilitated, the overlap ratio is good, and the through printing effect is not prone to being affected.

Description

Technical Field

[0001] This utility model relates to the field of SMT printing machine technology, specifically to a stencil fixing device for an SMT printing machine. Background Technology

[0002] SMT printing machines are machines used in SMT electronic assembly processes to print electronic components onto circuit boards through openings in a stencil. The purpose is to adhere chip-type electronic components. The stencil material is usually steel, also known as stencil. The role of the stencil is to help deposit solder paste, transferring the correct amount of solder paste or glue to the correct position on the blank PCB.

[0003] The existing fixing devices use multiple threaded knobs for clamping, which makes installation and disassembly cumbersome. When fixing steel mesh of different sizes, it is difficult to align the center position, and the overlap with the corresponding position on the PCB below is poor, which can easily affect the printing effect.

[0004] To address this, a stencil fixing device for SMT printing machines is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a stencil fixing device for an SMT printing machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a stencil fixing device for an SMT printing machine, comprising an outer frame, a pair of bidirectional lead screws rotatably connected to the inner sidewall of the outer frame, a pair of sliders threadedly connected to the outer sidewall of the bidirectional lead screws, a pair of longitudinal clamping plates provided on the inner side of the outer frame, a connecting rod hinged between the opposite sides of the pair of longitudinal clamping plates and the upper surface of the sliders, a support plate fixedly connected to the adjacent sides of the pair of longitudinal clamping plates, a stencil frame placed on the upper surface of the support plate, a steel plate provided on the inner sidewall of the stencil frame, a pair of sliding grooves provided on the inner sidewall of the longitudinal clamping plates, a transverse clamping plate slidably connected to the inner sidewall of the sliding grooves, the outer sidewall of the transverse clamping plate fixedly connected to the outer sidewall of the sliders, and a pair of pressure blocks provided on the upper surface of the stencil frame.

[0007] As a further preferred embodiment of this technical solution: a driven sprocket is fixedly connected to the front side of the outer side wall of the bidirectional lead screw, and a chain is engaged with the outer side wall of the driven sprocket.

[0008] As a further preferred embodiment of this technical solution: a rotating rod is rotatably connected to the front surface of the outer frame, and a drive sprocket is fixedly connected to the outer side wall of the rotating rod, with the outer side wall of the drive sprocket meshing with the inner side wall of the chain.

[0009] As a further preferred embodiment of this technical solution: the front end of the rotating rod is fixedly connected to a handle.

[0010] As a further preferred embodiment of this technical solution: the inner wall of the transverse clamping plate is slidably connected to an adjusting block, the outer wall of the adjusting block is fixedly connected to the outer wall of the pressure block, the inner wall of the adjusting block is threadedly connected to a threaded rod, and the lower end of the threaded rod is rotatably connected to the upper surface of the transverse clamping plate.

[0011] As a further preferred embodiment of this technical solution: a gasket is adhered to the lower surface of the pressure block.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In use, the screen frame is placed inside the outer frame, and the support plate supports the bottom of the screen frame. Rotating the threaded rod causes the adjusting block to slide up and down, adjusting the height of the pressure block. By rotating the handle, the driving sprocket, in conjunction with the chain and driven sprocket, synchronously drives the two bidirectional lead screws, causing the sliders to move closer together. The connecting rod pushes the longitudinal clamping plate to clamp and fix the screen frame longitudinally. At the same time, as the slider moves, it causes the two transverse clamping plates to move closer together. The transverse clamping plates slide in the groove, clamping and fixing the screen frame laterally. The pressure block, in conjunction with the support plate, clamps the screen frame vertically. The friction generated during soldering makes it difficult to push the slider, reducing the likelihood of deviation. During disassembly and assembly, simply reverse the bidirectional lead screw to release the restriction, facilitating quick disassembly and assembly. The synchronous movement of the clamps makes it easy to align the center position, resulting in good overlap and minimizing the impact on the stencil printing effect. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the mesh frame and steel plate in this utility model;

[0016] Figure 3 This is a schematic diagram of the bidirectional lead screw, slider, and longitudinal clamping plate in this utility model;

[0017] Figure 4 This is a schematic diagram of the driven sprocket, chain, and driving sprocket in this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the pressure block, adjusting block and threaded rod in this utility model.

[0019] In the diagram: 1. Outer frame; 2. Two-way lead screw; 3. Slider; 4. Longitudinal clamping plate; 5. Connecting rod; 6. Support plate; 7. Mesh frame; 8. Steel plate; 9. Slide groove; 10. Transverse clamping plate; 11. Pressure block; 12. Driven sprocket; 13. Chain; 14. Rotating rod; 15. Drive sprocket; 16. Handle; 17. Adjusting block; 18. Threaded rod; 19. Washer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "equipment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] Please see Figure 1-5 This utility model provides a technical solution: a stencil fixing device for an SMT printing machine, including an outer frame 1. A pair of bidirectional lead screws 2 are rotatably connected to the inner side wall of the outer frame 1, and a pair of sliders 3 are threadedly connected to the outer side wall of the bidirectional lead screws 2. A pair of longitudinal clamping plates 4 are provided on the inner side of the outer frame 1. A connecting rod 5 is hinged between the opposite sides of the pair of longitudinal clamping plates 4 and the upper surface of the sliders 3. A support plate 6 is fixedly connected to the adjacent sides of the pair of longitudinal clamping plates 4. A stencil frame 7 is placed on the upper surface of the support plate 6. A steel plate 8 is provided on the inner side wall of the stencil frame 7. A pair of sliding grooves 9 are opened on the inner side wall of the longitudinal clamping plates 4. A transverse clamping plate 10 is slidably connected to the inner side wall of the sliding grooves 9. The outer side wall of the transverse clamping plate 10 is fixedly connected to the outer side wall of the sliders 3. A stencil frame 7 is provided on the upper surface of the stencil frame 7. When using the pressure block 11, the screen frame 7 is placed inside the outer frame 1, and the bottom of the screen frame 7 is supported by the support plate 6. The two bidirectional lead screws 2 are rotated synchronously to bring the sliders 3 closer together. The connecting rod 5 pushes the longitudinal clamping plate 4 to clamp and fix the screen frame 7 longitudinally. At the same time, when the slider 3 moves, it drives the two transverse clamping plates 10 to move closer together. The transverse clamping plates 10 slide in the slide groove 9 to clamp and fix the screen frame 7 laterally. The pressure block 11, together with the support plate 6, clamps the screen frame 7 vertically. The friction generated during soldering makes it difficult to push the slider 3, and it is not easy to deviate. When disassembling, simply reverse the bidirectional lead screw 2 to release the restriction, which is convenient for quick disassembly and assembly. The synchronous movement of the clamping makes it easy to align the center position, with good overlap, and it is not easy to affect the stencil printing effect.

[0023] In this embodiment, specifically: a driven sprocket 12 is fixedly connected to the front side of the outer side wall of the bidirectional lead screw 2, and a chain 13 is engaged with the outer side wall of the driven sprocket 12; the driven sprocket 12 and the chain 13 can make the two bidirectional lead screws 2 rotate synchronously.

[0024] In this embodiment, specifically: a rotating rod 14 is rotatably connected to the front surface of the outer frame 1, and a drive sprocket 15 is fixedly connected to the outer side wall of the rotating rod 14. The outer side wall of the drive sprocket 15 meshes with the inner side wall of the chain 13. By rotating the rotating rod 14, the drive sprocket 15 is driven, which in turn drives the two bidirectional lead screws 2 in sync with the chain 13.

[0025] In this embodiment, specifically: a handle 16 is fixedly connected to the front end of the rotating rod 14; the handle 16 facilitates the user to rotate the rotating rod 14.

[0026] In this embodiment, specifically: an adjusting block 17 is slidably connected to the inner wall of the transverse clamping plate 10, the outer wall of the adjusting block 17 is fixedly connected to the outer wall of the pressure block 11, and a threaded rod 18 is threadedly connected to the inner wall of the adjusting block 17. The lower end of the threaded rod 18 is rotatably connected to the upper surface of the transverse clamping plate 10. According to the thickness of the mesh frame 7, rotating the threaded rod 18 causes the adjusting block 17 to slide up and down, thereby adjusting the height of the pressure block 11.

[0027] In this embodiment, specifically: a gasket 19 is adhered to the lower surface of the pressure block 11; the gasket 19 is the same as the outer wall of the protective mesh frame 7, reducing the occurrence of scratches and having a certain degree of anti-slip properties.

[0028] The working principle of this utility model is as follows: When in use, the screen frame 7 is placed inside the outer frame 1, and the bottom of the screen frame 7 is supported by the support plate 6. According to the thickness of the screen frame 7, the threaded rod 18 is rotated to drive the adjusting block 17 to slide up and down, thereby adjusting the height of the pressure block 11. By rotating the rotating rod 14 through the handle 16, the driving sprocket 15, in conjunction with the chain 13 and the driven sprocket 12, synchronously drives the two bidirectional lead screws 2, causing the sliders 3 to move closer to each other. The connecting rod 5 pushes the longitudinal clamping plate 4 to clamp and fix the screen frame 7 longitudinally. At the same time, when the slider 3 moves, it drives the two transverse clamping plates 10 to move closer to each other. The transverse clamping plates 10 slide in the slide groove 9 to clamp and fix the screen frame 7 laterally. The pressure block 11, in conjunction with the support plate 6, clamps it up and down. The friction generated during soldering makes it difficult to push the slider 3, and it is not easy to deviate. When disassembling and assembling, simply reverse the bidirectional lead screw 2 to release the restriction, which is convenient for quick disassembly and assembly. The synchronous movement of the clamping makes it easy to align the center position, with good overlap, and it is not easy to affect the stencil printing effect.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stencil fixing device for an SMT printing machine, comprising an outer frame (1), characterized in that: The inner wall of the outer frame (1) is rotatably connected to a pair of bidirectional lead screws (2), and the outer wall of the bidirectional lead screws (2) is threadedly connected to a pair of sliders (3). The inner side of the outer frame (1) is provided with a pair of longitudinal clamping plates (4). The opposite sides of the pair of longitudinal clamping plates (4) are hinged to the upper surface of the sliders (3) with a connecting rod (5). The adjacent sides of the pair of longitudinal clamping plates (4) are fixedly connected to a support plate (6). A mesh frame (7) is placed on the upper surface of the support plate (6). The inner wall of the mesh frame (7) is provided with a steel plate (8). The inner wall of the longitudinal clamping plates (4) is provided with a pair of sliding grooves (9). The inner wall of the sliding grooves (9) is slidably connected to a transverse clamping plate (10). The outer wall of the transverse clamping plate (10) is fixedly connected to the outer wall of the sliders (3). The upper surface of the mesh frame (7) is provided with a pair of pressure blocks (11).

2. The stencil fixing device for an SMT printing machine according to claim 1, characterized in that: A driven sprocket (12) is fixedly connected to the front side of the outer side wall of the bidirectional lead screw (2), and a chain (13) is engaged on the outer side wall of the driven sprocket (12).

3. The stencil fixing device for an SMT printing machine according to claim 2, characterized in that: The front surface of the outer frame (1) is rotatably connected to a rotating rod (14), and the outer side wall of the rotating rod (14) is fixedly connected to a drive sprocket (15). The outer side wall of the drive sprocket (15) meshes with the inner side wall of the chain (13).

4. The stencil fixing device for an SMT printing machine according to claim 3, characterized in that: A handle (16) is fixedly connected to the front end of the rotating rod (14).

5. The stencil fixing device for an SMT printing machine according to claim 1, characterized in that: An adjusting block (17) is slidably connected to the inner wall of the transverse clamping plate (10). The outer wall of the adjusting block (17) is fixedly connected to the outer wall of the pressure block (11). A threaded rod (18) is threadedly connected to the inner wall of the adjusting block (17). The lower end of the threaded rod (18) is rotatably connected to the upper surface of the transverse clamping plate (10).

6. The stencil fixing device for an SMT printing machine according to claim 1, characterized in that: A gasket (19) is bonded to the lower surface of the pressure block (11).

Images