Splitting fixture for SMT

Abstract

The utility model relates to surface mount technology field and disclose a kind of for SMT's split type fixing jig, including base, the base is provided with the bottom plate for carrying PCB board, the top plate for fixing PCB board is provided with in the top of bottom plate, the top plate and bottom plate are connected by magnetic attraction component between;The operating hole corresponding with the position and quantity of PCB board is opened in the top plate, the inner wall of the operating hole is provided with the protruding baulk inward, and when the top plate is connected with the bottom plate by the magnetic attraction component, the baulk is pressed at the edge of PCB board.The jig of the utility model can directly use PCB single board to material, carry out board splicing on jig, save board dividing process, reduce board dividing difficulty, reduce the damage to circuit board in board dividing process while guaranteeing the strength of board splicing;And the top plate is replaced by magnetic attraction mode instead of adhesive tape adhesion, for PCB board fixation and prevent warping deformation after furnace.

Description

Technical Field

[0001] This utility model relates to the field of surface mount technology, specifically to a splicing fixture for SMT. Background Technology

[0002] In surface mount technology (SMT) production, panelization technology is widely used both domestically and internationally to improve SMT production efficiency. By using V-Cut slots and stamp holes to assemble multiple single boards into a large panel, the positioning accuracy and output per unit time of SMT equipment are improved, which is the current mainstream technology path.

[0003] However, existing SM jigs still have the following drawbacks: (1) Subsequent board separation is required. Mechanical cutting can easily cause PCB cracking and component detachment. In addition, the cost of board separation equipment is high and the production cycle is extended. (2) Using high-temperature resistant tape to fix the panels is not only cumbersome and time-consuming to change the shape, but also the adhesion decay at high temperature can easily cause the PCB to warp. (3) Existing fixtures are custom-designed, have poor adaptability, and are difficult to meet the needs of multi-variety, small-batch production.

[0004] Therefore, we propose a modular fixing fixture for SMT to overcome the above-mentioned shortcomings. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a modular fixing fixture for SMT, which uses a three-in-one fixture for panel assembly, eliminating the need for panel separation and improving work efficiency; and provides a stable and lasting adsorption force through a magnetic component to ensure that the top plate will not loosen due to vibration or temperature changes during the production process.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A modular mounting fixture for SMT includes a base, a bottom plate for supporting PCB boards, and a top plate for fixing the PCB boards above the bottom plate. The top plate and the bottom plate are connected by a magnetic assemblies. The top plate has operating holes corresponding to the position and number of PCB boards. The inner wall of the operating holes has inwardly protruding pressure blocks. When the top plate is connected to the bottom plate by the magnetic assemblies, the pressure blocks press against the edges of the PCB boards.

[0007] Optionally, the magnetic suction assembly includes a mounting hole formed in the top plate, a magnetic block is installed in the mounting hole, and one end of the magnetic block protrudes from the top plate and contacts the bottom plate.

[0008] Optionally, multiple operation holes are equidistantly distributed on the top plate, and multiple magnetic suction components are provided between two adjacent operation holes.

[0009] Optionally, a plurality of positioning posts are fixedly installed on the bottom surface of the top plate, and positioning holes corresponding to the position and number of the positioning posts are opened on the bottom plate, and the lower end of the positioning post can be embedded in the corresponding positioning hole.

[0010] Optionally, the base plate is provided with a plurality of heat-absorbing holes and weight-reducing holes, the weight-reducing holes being located outside the heat-absorbing holes and close to the edge of the base plate.

[0011] Optionally, the base plate has handle holes near its edges at both ends, and the base has notches at both ends corresponding to the handle holes, with a portion of the handle holes extending above the notches.

[0012] Optionally, multiple sets of positioning rods are fixedly installed on the base, with the upper end of the positioning rods extending through the heat-absorbing hole into the operating hole.

[0013] Optionally, multiple positioning blocks are fixedly installed on the base. The positioning blocks adopt an L-shaped structure, and the corners of the base plate are embedded inside the positioning blocks.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The fixture of this utility model can directly use PCB single board materials and perform board assembly on the fixture, saving the board separation process. While ensuring the strength of the assembly, it reduces the difficulty of board separation and reduces the damage to the circuit board during the board separation process. In addition, the top plate uses magnetic attraction instead of adhesive tape to fix the PCB board and prevent warping and deformation after the furnace. (2) In this utility model, the magnetic block is fixedly installed in the mounting hole, which provides a stable and lasting adsorption force to ensure that the top plate will not loosen due to vibration or temperature changes during the production process; and the lower end of the magnetic block protrudes from the top plate to ensure that it can contact the bottom plate to achieve stable magnetic attraction. (3) In this utility model, by working together with multiple sets of positioning reference points such as positioning blocks, positioning columns and magnetic components, the panelization error can be controlled within a very small range, meeting the panelization requirements of circuit boards of different sizes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembly-type fixing fixture for SMT in an embodiment of this utility model; Figure 2 This is an exploded structural diagram of the assembly-type fixing fixture for SMT in an embodiment of this utility model; Figure 3This is a top view of the assembly-type fixing fixture for SMT in an embodiment of this utility model; Figure 4 This is a schematic diagram of the top plate structure in an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the base plate in an embodiment of this utility model; Figure 6 This is a schematic diagram of the base structure in an embodiment of this utility model; Among them, 1 is the base; 101 is the positioning block; 102 is the positioning rod; and 103 is the notch. 2. Base plate; 201. Heat-absorbing hole; 202. Positioning hole; 203. Handle hole; 204. Weight reduction hole; 3. Top plate; 301. Operating hole; 302. Pressure block; 303. Mounting hole; 304. Positioning post; 4. Magnetic block. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0017] Example 1, as Figures 1-6 As shown, a modular mounting fixture for SMT includes a base 1, a bottom plate 2, and a top plate 3. The bottom plate 2 and the top plate 3 are stacked on the base 1 from bottom to top. The base 1 is used to position and support the bottom plate 2. The bottom plate 2 is used to support the PCB board. The top plate 3 is used to fix the PCB board on the bottom plate 2. The top plate 3 and the bottom plate 2 are connected by a magnetic assemblies.

[0018] The fixing fixture proposed in this utility model can directly use PCB single board materials and perform board assembly on the fixture, eliminating the board separation process. While ensuring the strength of the assembly, it reduces the difficulty of board separation and reduces damage to the circuit board during the board separation process. In addition, the top plate 3 uses magnetic attraction instead of tape to fix the PCB board and prevent warping and deformation after the furnace.

[0019] As described above, the top plate 3 has operation holes 301 corresponding to the position and number of PCB boards to facilitate subsequent processes. The inner wall of the operation hole 301 is provided with an inwardly protruding pressure block 302, which can press against the edge of the PCB board. The pressure block 302 and the top plate 3 adopt an integral molding structure.

[0020] The magnetic suction components are installed on the top plate 3, and multiple operation holes 301 are distributed at equal intervals on the top plate 3. Multiple magnetic suction components are provided between each pair of adjacent operation holes 301 to provide sufficient adsorption force and ensure a firm and stable connection between the top plate 3 and the bottom plate 2.

[0021] Specifically, the magnetic assembly includes a mounting hole 303 and a magnetic block 4. The mounting hole 303 is opened on the top plate 3 and located between two adjacent operating holes 301. The magnetic block 4 is fixedly embedded in the mounting hole 303, and the lower end of the magnetic block 4 protrudes from the top plate 3 so that after the protrusion is pressed against the edge of the PCB board, the magnetic block 4 can still contact the bottom plate 2, thereby realizing the magnetic attraction between the top plate 3 and the bottom plate 2.

[0022] Compared to the existing method of bonding with high-temperature resistant tape, the magnetic attraction structure between the top plate 3 and the bottom plate 2 proposed in this utility model can fix the PCB board on the bottom plate 2 while preventing it from deforming after the furnace.

[0023] Furthermore, the base plate 2 has multiple heat absorption prevention holes 201 and weight reduction holes 204. The weight reduction holes 204 are located outside the heat absorption prevention holes 201 and close to the edge of the base plate 2. The function of the weight reduction holes 204 is to ensure that the overall structure of the base plate 2 meets the requirements for reflow soldering, while reducing the weight of the base plate 2 as much as possible by removing local materials, so as to facilitate handling.

[0024] The heat-absorbing hole 201 corresponds to the location of the PCB board. In the high-temperature environment inside the reflow oven, the fixture material easily absorbs and stores heat. The heat-absorbing hole 201 can reduce the contact area between the fixture and the high-temperature environment, reduce the overall heat absorption, and prevent the fixture from becoming a heat source.

[0025] If the fixture absorbs too much heat, the local temperature of the PCB board may be lower than the peak temperature required for soldering, causing problems such as poor soldering and cold soldering. The heat absorption hole 201 can reduce the heat grabbing by the fixture from the bottom or surrounding of the PCB, ensuring that the temperature of the soldering area meets the standard.

[0026] To ensure that the top plate 3 and the bottom plate 2 can be aligned and fitted, there is a positioning structure between them, including positioning posts 304 and positioning holes 202. The number and position of the two are corresponding. The positioning posts 304 are fixedly installed on the bottom surface of the top plate 3, and the positioning holes 202 are opened on the bottom plate 2. The lower end of the positioning post 304 can be embedded in the corresponding positioning hole 202.

[0027] As described above, multiple positioning blocks 101 are fixedly installed on the base 1, and the positioning blocks 101 adopt an L-shaped structure; the two ends of the base plate 2 are provided with handle holes 203 near the edges, and the two ends of the base 1 are provided with notches 103 corresponding to the handle holes 203; after the base plate 2 is placed on the base 1, the corner of the base plate 2 is embedded into the inside of the positioning block 101 to complete the positioning, and a part of the handle hole 203 extends to the top of the notch 103, which makes it convenient for the operator to grab the base plate 2.

[0028] Furthermore, multiple sets of positioning rods 102 are fixedly installed on the base 1. The upper end of the positioning rod 102 extends through the heat-absorbing hole 201 into the operating hole 301. The positioning rod 102 is used to position the PCB board, so that the PCB board is accurately placed on the base plate 2, which facilitates the top plate 3 to press and fix it.

[0029] Working principle: First, place the base plate 2 on the base 1. Position the base plate 2 horizontally using the positioning block 101. Then, place the PCB board on the base plate 2 using the positioning rod 102, so that the positioning rod 102 passes through the corresponding hole on the PCB board, thereby positioning the PCB board on the base plate 2. Finally, press the top plate 3 onto the base plate 2. During this process, the positioning post 304 is embedded in the positioning hole 202, and the lower end of the magnetic block 4 contacts the base plate 2 to complete the magnetic fixation. When the top plate 3 is connected to the base plate 2 through the magnetic assembly, the pressure block 302 on the inner wall of the operating hole 301 presses against the corresponding edge on the PCB board. After the PCB board is fixed between the top plate 3 and the base plate 2, the assembly of the top plate 3, the PCB board, and the base plate 2 can be moved away from the base 1 as a whole through the handle hole 203 at the notch 103.

[0030] This utility model proposes a modular fixing fixture for SMT, which uses a three-in-one fixture for board assembly, eliminating the need for board separation and improving work efficiency. By developing a new top plate 3 fixing technology, using magnetic blocks 4 made of high magnetic material, it provides stable and lasting adsorption force to ensure that the top plate 3 will not loosen due to vibration or temperature changes during production. At the same time, the uniquely designed mechanical positioning is easy to operate and can quickly complete the placement of PCB boards and the installation and removal of the top plate 3, thereby improving production efficiency.

[0031] In Example 2, this utility model also proposes the specific quantity of each structure of the assembled fixing fixture.

[0032] like Figures 1-6 As shown, there are three operating holes 301 on the top plate 3, which correspond to the three PCB boards respectively. The position and number of pressure blocks 302 in the operating holes 301 are based on the structural design of the PCB board. There are three sets of positioning rods 102, each set having three rods, corresponding to the hole distribution on the PCB board.

[0033] There are two sets of magnetic suction components, with 6 components in each set, and the magnetic suction components in each set are evenly distributed between two adjacent operation holes 301.

[0034] Four positioning blocks 101 are provided and distributed at the four corners of the base plate 2 to facilitate the positioning of the base plate 2 on the base 1.

[0035] There are four positioning posts 304 and four positioning holes 202, arranged in pairs and symmetrically distributed; however, in actual use, only the two positioning posts 304 at the diagonal positions need to be installed to complete the positioning of the top plate 3 relative to the bottom plate 2 on the horizontal plane.

[0036] In summary, this invention proposes a modular fixing fixture for SMT (Surface Mount Technology), which solves the problems of cumbersome operation and long time consumption in the panelization and top cover fixing stages of traditional SMT fixtures. By optimizing the panelization structure and top cover fixing method, the installation, debugging, and replacement time of the fixture are reduced, enabling rapid circuit board positioning and mass production, significantly shortening the SMT production line cycle time, and meeting the ever-increasing production demands of electronic products.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A modular fixing fixture for SMT (Surface Mount Technology), characterized in that: The device includes a base, on which a bottom plate for supporting a PCB board is provided, and a top plate for fixing the PCB board is provided above the bottom plate. The top plate and the bottom plate are connected by a magnetic assemblies. The top plate has operating holes corresponding to the position and number of PCB boards. The inner wall of the operating holes is provided with inwardly protruding pressure blocks. When the top plate is connected to the bottom plate through the magnetic assemblies, the pressure blocks press against the edge of the PCB board.

2. The assembly-type fixing fixture for SMT according to claim 1, characterized in that: The magnetic suction assembly includes a mounting hole formed on the top plate, a magnetic block is installed in the mounting hole, and one end of the magnetic block protrudes from the top plate and contacts the bottom plate.

3. The assembly-type fixing fixture for SMT according to claim 2, characterized in that: Multiple operation holes are equidistantly distributed on the top plate, and multiple magnetic suction components are provided between two adjacent operation holes.

4. The assembly-type fixing fixture for SMT according to claim 1, characterized in that: Multiple positioning posts are fixedly installed on the bottom surface of the top plate, and positioning holes corresponding to the position and number of the positioning posts are opened on the bottom plate, and the lower end of the positioning post can be embedded in the corresponding positioning hole.

5. The assembly-type fixing fixture for SMT according to claim 1, characterized in that: The base plate has multiple heat-absorbing holes and weight-reducing holes, with the weight-reducing holes located outside the heat-absorbing holes and close to the edge of the base plate.

6. The assembly-type fixing fixture for SMT according to claim 5, characterized in that: The base plate has handle holes near its edges at both ends, and the base has notches at both ends corresponding to the handle holes, with a portion of the handle holes extending above the notches.

7. The assembly-type fixing fixture for SMT according to claim 6, characterized in that: Multiple positioning rods for PCB board positioning are fixedly installed on the base, and the upper end of the positioning rods extends through the heat-absorbing hole into the operating hole.

8. The assembly-type fixing fixture for SMT according to any one of claims 1-7, characterized in that: Multiple positioning blocks are fixedly installed on the base. The positioning blocks adopt an L-shaped structure, and the corners of the base plate are embedded in the inner side of the positioning blocks.

Images