Replaceable PCB (Printed Circuit Board) printing steel mesh mould base

Abstract

A replaceable PCB printing steel mesh formwork comprises a plurality of transverse rods and vertical rods, the transverse rods and the vertical rods are connected to form an outer frame and an inner frame, a steel mesh is placed in the inner frame and fixed to the inner frame, and the outer frame is matched with a solder paste printer; the transverse rods comprise two outer transverse rods and two inner transverse rods, the vertical rods comprise two outer vertical rods and two inner vertical rods, the outer transverse rods and the outer vertical rods are connected end to end to form an outer frame, the inner transverse rods and the inner vertical rods are connected to form an inner frame, a bottom plate used for limiting the steel mesh is arranged in the inner frame, through holes are formed in the inner vertical rods, and locking screws used for fixing the steel mesh are arranged in the through holes. The cross rods and the vertical rods form the frame for fixing the steel mesh, so that the size of the steel mesh is reduced, the development cost is saved, resources are reasonably utilized, the weight is light, carrying is convenient, the occupied area is small, storage is convenient, when different PCBs are printed or different project steel meshes need to be developed, the different required steel meshes can be assembled, disassembled and replaced only by twisting the locking screws, and the cost is reduced. The time utilization rate and the production efficiency are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of PCB printing stencils, and particularly relates to a replaceable PCB printing stencil mold frame. Background Art

[0002] A PCB printing stencil is a printing fixture for printing solder paste on a PCB board. It is usually made of metal, and many small holes corresponding to the solder joints on the PCB board in terms of position and size are distributed thereon. Its main function is to assist in the deposition of solder paste and transfer an accurate amount of solder paste to the accurate position on the PCB board. In the manufacturing process of a PCB, the stencil plays a very important role. It can ensure that the solder paste is evenly distributed on the PCB board, improve the quality and reliability of soldering, and can also control the thickness of the solder paste to ensure that the size and shape of the solder joints meet the design requirements. It is an indispensable part of the PCB manufacturing process, and its quality and precision directly affect the soldering quality and reliability of the PCB board. At present, the clamping size of the stencil equipment in use is 730*730mm, but the actual production range is only 521*421mm. There are undoubtedly the following deficiencies:

[0003] 1. The equipment size is very different from the usage range, resulting in a large amount of empty space and serious waste of production materials;

[0004] 2. It has a large volume and weight, and it is relatively difficult to store, transport and clamp;

[0005] 3. Different PCBs are adapted to stencils with different hole positions. Hundreds of stencils require a large amount of storage space, resulting in difficult storage. Summary of the Invention

[0006] The purpose of the utility model is to provide a PCB printing stencil mold frame that saves resources, is light in weight, can reduce the stencil size and can replace the stencil, so as to overcome the deficiencies of the existing technologies.

[0007] The technical solution adopted by the utility model is: a replaceable PCB printing stencil mold frame, which includes a plurality of cross bars and vertical bars. The cross bars and vertical bars are connected to form an outer frame and an inner frame. A stencil is placed in the inner frame and fixed to the stencil, and the outer frame is adapted to a solder paste printer.

[0008] Its further technical solution is: the cross bars include two outer cross bars and two inner cross bars, and the vertical bars include two outer vertical bars and two inner vertical bars. The two outer cross bars and the two outer vertical bars are connected end to end in pairs to form an outer frame. The two ends of the two inner cross bars are respectively fixed to the two outer vertical bars, and the two ends of the two inner vertical bars are respectively fixed to the two inner cross bars, so that the inner cross bars and the inner vertical bars form an inner frame.

[0009] Furthermore: a bottom plate for limiting the stencil is arranged in the inner frame.

[0010] Furthermore: The bottom plate is vertically strip-shaped and is arranged on the left and right sides inside the inner frame, and is fixed to the inner horizontal bar and the inner vertical bar.

[0011] Further: Through holes are formed in the inner vertical bars, and locking screws for fixing the steel mesh are arranged in the through holes.

[0012] Further: Both the horizontal bar and the vertical bar are made of aluminum profiles, and are connected and fixed by locking screws between the horizontal bar and the vertical bar.

[0013] Due to the adoption of the above technical solutions, a replaceable PCB printing steel mesh mold frame of the present utility model has the following beneficial effects:

[0014] 1. Since the present utility model forms a frame for fixing the steel mesh through the horizontal bar and the vertical bar, the steel mesh only needs to be made of the actual area used in the middle. This not only reduces the size of the steel mesh, shortens the production cycle, and meets the production requirements in a timely manner, but also the small-sized steel mesh is light in weight, convenient to carry, occupies a small area, is convenient to store, and hundreds of steel meshes save more than half of the storage space compared with before;

[0015] 2. Since the present utility model fixes the steel mesh in the inner frame through locking screws, when printing different PCB boards or when different project steel meshes need to be developed later, only by turning the locking screws, the required different steel meshes can be loaded and unloaded and replaced, without replacing the entire large frame, and the disassembly and assembly are convenient, effectively improving the time utilization rate and production efficiency;

[0016] 3. Since the present utility model forms a steel mesh fixing structure by the frame, compared with the existing overall large steel mesh, a lot of steel production materials are reduced, the development cost is greatly saved, resources are reasonably utilized, and the product is light in weight;

[0017] 4. The present utility model is a small-volume product, which is convenient to clean, and can save cleaning time and consumables.

[0018] The following further describes the technical features of a replaceable PCB printing steel mesh mold frame of the present utility model in conjunction with the drawings and embodiments. Description of the Drawings

[0019] Figure 1 It is a three-dimensional structure diagram (placing the steel mesh) of a replaceable PCB printing steel mesh mold frame according to Embodiment 1 of the present utility model;

[0020] Figure 2 It is a front view (placing the steel mesh) of a replaceable PCB printing steel mesh mold frame according to Embodiment 1 of the present utility model;

[0021] Figure 3 It is a three-dimensional structure diagram (not placing the steel mesh) of a replaceable PCB printing steel mesh mold frame according to Embodiment 1 of the present utility model.

[0022] In the figure:

[0023] 1 - outer cross bar, 2 - inner cross bar, 3 - outer vertical bar, 4 - inner vertical bar, 5 - bottom plate, 6 - locking screw, 7 - steel mesh. Specific embodiments Embodiment 1

[0024] A replaceable PCB printing steel mesh mold frame, as Figures 1 to 3 shown, includes multiple cross bars and vertical bars. The cross bars and vertical bars are all aluminum profiles. The cross bars and vertical bars are connected by locking screws to form an outer frame and an inner frame. The steel mesh 7 is placed inside the inner frame and fixed to the steel mesh 7. The outer frame is adapted to a solder paste printer and is fixed in the solder paste printer;

[0025] The cross bars include two outer cross bars 1 and two inner cross bars 2, and the vertical bars include two outer vertical bars 3 and two inner vertical bars 4. The two outer cross bars 1 and the two outer vertical bars 3 are connected end to end in pairs to form an outer frame. The two ends of the two inner cross bars 2 are respectively fixedly connected to the two outer vertical bars 3, and the two ends of the two inner vertical bars 4 are respectively fixedly connected to the two inner cross bars 2, so that the inner cross bars 2 and the inner vertical bars 4 form an inner frame. Two bottom plates 5 for limiting the steel mesh 7 are arranged inside the inner frame. The bottom plates 5 are strip-shaped and are arranged on the left and right sides inside the inner frame and are fixed to the inner cross bars 2 and the inner vertical bars 4. Through holes are provided on the inner vertical bars 4, and locking screws 6 for fixing the steel mesh 7 are arranged inside the through holes. When disassembling the steel mesh, loosen the locking screws, and then the steel mesh can be taken out. Replace the steel mesh and put it in, and tighten the locking screws to fix the steel mesh, thus realizing the replacement of the steel mesh. Embodiment 2

[0026] A replaceable PCB printing steel mesh mold frame, whose structure is basically the same as that of Embodiment 1, the difference is that the two outer cross bars and the two outer vertical bars are connected end to end in pairs to form an outer frame, the two ends of the two inner vertical bars are respectively fixedly connected to the two outer cross bars, and the two ends of the two inner cross bars are respectively fixedly connected to the two inner vertical bars, so that the inner cross bars and the inner vertical bars form an inner frame. Embodiment 3

[0027] A replaceable PCB printing steel mesh mold frame, whose structure is basically the same as that of Embodiment 1, the difference is that the bottom plates are strip-shaped and are arranged on the upper and lower sides inside the inner frame and are fixed to the inner cross bars and the inner vertical bars.

[0028] The above embodiments are only the preferred embodiments of the present invention. The structure of the present invention is not limited to the forms listed in the above embodiments. Any modifications, equivalent replacements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A replaceable PCB printing steel mesh mold frame, characterized in that: The steel mesh mold frame comprises a plurality of horizontal bars and vertical bars, wherein the horizontal bars and vertical bars are connected to form an outer frame and an inner frame, wherein the steel mesh (7) is placed in the inner frame and is fixed to the steel mesh (7), and the outer frame is adapted to be compatible with a solder paste printer.

2. The replaceable PCB printing steel mesh mold frame according to claim 1, characterized in that: The cross bars include two outer cross bars (1) and two inner cross bars (2), and the vertical bars include two outer vertical bars (3) and two inner vertical bars (4). The two outer cross bars (1) and the two outer vertical bars (3) are connected end to end to form an outer frame. The two inner cross bars (2) are respectively fixedly connected at both ends to the two outer vertical bars (3), and the two inner vertical bars (4) are respectively fixedly connected at both ends to the two inner cross bars (2), so that the inner cross bars (2) and the inner vertical bars (4) form an inner frame.

3. The replaceable PCB printing steel mesh mold frame according to claim 1, characterized in that: A bottom plate (5) for limiting the steel mesh (7) is provided in the inner frame.

4. The replaceable PCB printing steel mesh mold frame according to claim 3, characterized in that: The bottom plate (5) is in the shape of a vertical bar, and is arranged on the left and right sides of the inner frame, and is fixed to the inner horizontal bar (2) and the inner vertical bar (4).

5. The replaceable PCB printing steel mesh mold frame according to claim 2, characterized in that: The inner vertical rod (4) is provided with a through hole, and a locking screw (6) for fixing the steel mesh (7) is arranged in the through hole.

6. The replaceable PCB printing steel mesh mold frame according to claim 1, characterized in that: The crossbar and the vertical bar are both aluminum profiles, and are connected and fixed by locking screws.

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