A furnace passing jig

Abstract

This utility model discloses a reflow oven fixture, including a base plate and a pressure plate. The base plate is a flat plate with two rows of symmetrically distributed PCB mounting areas about the center line, each row having multiple positioning slots. The positioning slots include interconnected interface mounting slots and PCB placement slots, with the interface mounting slots having a greater depth than the PCB placement slots. The PCB placement slots have raised sections, the height of which is equal to half the difference between the thickness of a standard PCB and a thin PCB. When using a standard thickness PCB, the PCB has corresponding clearance holes for the raised sections. The pressure plate and base plate work together to press the PCB together. By providing raised sections, PCBs of different thicknesses can maintain a uniform mounting position in the same reflow oven fixture, effectively solving the height difference problem when thin and standard PCBs are produced together on the same production line. This improves production flexibility and efficiency, and ensures the stability and soldering quality of PCBs of different thicknesses during reflow soldering.

Description

Technical Field

[0001] This utility model relates to the field of circuit board welding, and in particular to a reflow fixture. Background Technology

[0002] With the continuous advancement of miniaturization and diversification trends in electronic products, modern SMT production lines need to handle PCBs of various specifications and thicknesses. Thin PCBs are widely used in consumer electronics due to their lightweight and cost advantages, while standard-thickness PCBs dominate in industrial control and high-reliability applications. In the SMT reflow soldering process, the reflow fixture, as a key production auxiliary tool, plays a crucial role in fixing and supporting the PCB as it passes through the high-temperature reflow oven, directly affecting soldering quality and production efficiency.

[0003] Existing reflow soldering fixtures are typically designed for PCBs of a single thickness. When the production line needs to process PCBs of different thicknesses, it often requires changing to different fixtures or performing complex adjustments. This not only increases production preparation time and equipment investment costs but also easily leads to positioning errors and operational mistakes during frequent line changes. In particular, when thin PCBs and standard PCBs need to be produced together on the same production line, the height inconsistency caused by the difference in PCB thickness can seriously affect the temperature control accuracy and soldering effect of reflow soldering, thereby affecting product quality and production efficiency.

[0004] Therefore, there is an urgent need for a reflow fixture solution that can be compatible with PCBs of different thicknesses to meet the requirements of modern SMT production lines for flexibility and versatility. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a reflow fixture compatible with PCB boards of different thicknesses.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A reflow oven fixture includes a base plate and a pressure plate. The base plate is a flat plate with two rows of PCB mounting areas symmetrically distributed about the center line of the base plate. Each row of PCB mounting areas has multiple positioning slots. Each positioning slot includes an interface mounting slot and a PCB placement slot that are interconnected. The depth of the interface mounting slot is greater than the depth of the PCB placement slot. The PCB placement slot has a raised portion with a height equal to half the difference between the thickness of a standard PCB board and a thin PCB board. When using a standard thickness PCB board, the PCB board has clearance holes corresponding to the raised portion. The pressure plate cooperates with the base plate to press the PCB board located in the mounting area.

[0008] Furthermore, each of the PCB placement slots is provided with a plurality of the heightening portions along its circumferential edge.

[0009] Furthermore, the heightening section includes a first support block, a second support block, and a third support block, wherein the first support block is disposed on the side of the PCB placement slot away from the interface mounting slot, the second support block is disposed on the two sides of the PCB placement slot close to the first support block, and the third support block is disposed on the two sides of the PCB placement slot close to the interface mounting slot.

[0010] Furthermore, the first support block is a strip-shaped structure extending along the width direction of the PCB placement slot; the second support block is a square structure; the third support block is a long strip structure extending along the length direction of the PCB placement slot, and two adjacent third support blocks constitute a whole support block.

[0011] Furthermore, the base plate is provided with positioning protrusions; the PCB board is provided with positioning holes corresponding to the positions of the positioning protrusions, and the positioning protrusions are inserted into the positioning holes to achieve positioning of the PCB board.

[0012] Furthermore, two positioning protrusions are provided on each side of each row of PCB mounting areas.

[0013] Furthermore, the pressure plate includes a first pressure plate and a second pressure plate; the first pressure plate is disposed on both sides of the base plate, each first pressure plate includes a first part pressing against the side of the base plate and a second part extending downward along the side, the cross-section of the first pressure plate is L-shaped; the second pressure plate is disposed between the two rows of PCB mounting areas, extending along the length direction of the base plate, for simultaneously pressing the two rows of PCB boards.

[0014] Furthermore, the second pressure plate extends along the width direction of the base plate to form a plurality of symmetrically arranged pressure arms; the straight line containing the two symmetrical pressure arms is located on the center line of two adjacent positioning grooves.

[0015] Furthermore, a first magnet is provided at both ends of the base plate corresponding to the contact portion of the first pressure plate; a second magnet is provided at the position of the first magnet on the first pressure plate, and the first magnet and the second magnet are magnetically attracted to each other; a third magnet is provided at both ends of the second pressure plate; and a fourth magnet is provided at the position of the third magnet on the base plate, and the third magnet and the fourth magnet are magnetically attracted to each other.

[0016] Furthermore, the base plate is provided with board picking slots at both ends, and the board picking slots are respectively connected to the positioning slots at both ends; the board picking slots are located on the symmetrical line of the two PCB boards along the length direction of the base plate, and are used for inserting fingers to grasp the PCB boards.

[0017] The beneficial effects of this utility model are:

[0018] This utility model discloses a reflow oven fixture, comprising a base plate and a pressure plate. The base plate is a flat plate with two rows of symmetrically distributed PCB mounting areas about the center line, each row having multiple positioning slots. The positioning slots include interconnected interface mounting slots and PCB placement slots, with the interface mounting slots having a greater depth than the PCB placement slots. The PCB placement slots have raised sections, the height of which is equal to half the difference between the thickness of a standard PCB and a thin PCB. When using a standard thickness PCB, the PCB has corresponding clearance holes for the raised sections. The pressure plate and base plate work together to press the PCB together. By providing raised sections, PCBs of different thicknesses can maintain a uniform mounting position within the same reflow oven fixture, effectively solving the height difference problem when producing PCBs of different thicknesses on mixed lines, improving production flexibility and efficiency, and ensuring the stability and soldering quality of PCBs of different thicknesses during reflow soldering. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a top view of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the base plate of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the first pressure plate of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the second pressure plate of this utility model;

[0025] Figure 6 This is a schematic diagram of the standard PCB board structure of this utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the thin PCB board of this utility model.

[0027] in,

[0028] 100. Base plate;

[0029] 110. Installation area; 111. Positioning slot; 1111. Interface mounting slot; 1112. PCB placement slot; 1113. Heightening section; 1113a. First support block; 1113b. Second support block; 1113c. Third support block; 112. First magnet; 113. Fourth magnet; 114. Positioning protrusion; 115. Board removal slot;

[0030] 200. Pressure plate; 210. First pressure plate; 211. Second magnet; 220. Second pressure plate; 221. Third magnet; 222. Pressure arm;

[0031] 300, PCB board; 310, clearance hole; 320, positioning hole. Detailed Implementation

[0032] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0033] Reference Figure 1-3 A reflow oven fixture includes a base plate 100 and a pressure plate 200. The base plate 100 is a flat plate structure, and two rows of PCB mounting areas 110 are provided on the base plate 100. The two rows of PCB mounting areas 110 are symmetrically distributed about the center line of the base plate 100. Each row of PCB mounting areas 110 is provided with multiple positioning slots 111. Each positioning slot 111 includes an interface mounting slot 1111 and a PCB placement slot 1112 that are interconnected. The depth of the interface mounting slot 1111 is greater than P. The depth of the PCB placement slot 1112; the PCB placement slot 1112 is provided with a raised portion 1113, the height of which is equal to half the difference between the thickness of the standard PCB board 300 and the thickness of the thin PCB board 300; when using a standard thickness PCB board 300, the PCB board 300 is provided with a clearance hole 310 corresponding to the raised portion 1113; the pressure plate 200 cooperates with the base plate 100 to press the PCB board 300 located in the mounting area 110.

[0034] This utility model's reflow fixture achieves compatibility with PCB boards of varying thicknesses through a layered design. (Refer to...) Figure 7 When the thin PCB board 300 needs to be processed, the thin board is placed directly in the PCB placement slot 1112. At this time, the lifting part 1113 raises the thin PCB board 300 to the standard installation position, thereby ensuring that all PCB boards 300 can obtain a uniform heating effect during the reflow process.

[0035] Reference Figure 6 When using a standard thickness PCB board 300, since the thickness of the PCB board 300 itself already meets the standard requirements, the raised part 1113 will become an unnecessary protrusion. Therefore, it is necessary to pre-set clearance holes 310 on the standard PCB board 300 corresponding to the position of the raised part 1113. When the standard PCB board 300 is placed into the PCB placement slot 1112, the raised part 1113 is precisely embedded in these clearance holes 310, so that the bottom surface of the standard PCB board 300 can be stably attached to the bottom of the PCB placement slot 1112, thus ensuring the consistency of the standard height.

[0036] For example, in a production line, when the same batch needs to process a 0.8mm thick thin PCB board 300 and a 1.6mm thick standard PCB board 300, the thin PCB board 300, after being placed directly, is supported to the standard height of 1.6mm by the 0.8mm high riser 1113, while the 1.6mm thick standard PCB board 300 is accommodated by the riser 1113 through a pre-set clearance hole 310. Both types of PCB boards 300, with different thicknesses, can ultimately be reflow soldered on the same horizontal plane, ensuring consistent soldering quality. A pressure plate 200 presses against the base plate 100 to apply appropriate pressure to the PCB board 300 to prevent warping.

[0037] In some embodiments, refer to Figure 3 Each of the PCB placement slots 1112 is provided with a plurality of raised portions 1113 along its circumferential edge. The distributed raised portions 1113 can provide a more stable and uniform support effect for the thin PCB board 300. When the thin PCB board 300 is placed in the PCB placement slot 1112, these multiple raised portions 1113 distributed along the circumferential edge can simultaneously contact and support different areas of the thin PCB board 300, thereby effectively preventing the thin PCB board 300 from undergoing local deformation or warping due to uneven heating or vibration during the reflow process, while ensuring that the thin PCB board 300 can be stably maintained at the same horizontal height as the standard PCB board 300.

[0038] Specifically, refer to Figure 3The heightening portion 1113 includes a first support block 1113a, a second support block 1113b, and a third support block 1113c. The first support block 1113a is disposed on the side of the PCB placement slot 1112 away from the interface mounting slot 1111. The second support block 1113b is disposed on the two sides of the PCB placement slot 1112 near the first support block 1113a. The third support block 1113c is disposed on the two sides of the PCB placement slot 1112 near the interface mounting slot 1111. In other words, the first support block 1113a, as the main distal support structure, is located on the side of the PCB placement slot 1112 away from the interface mounting slot 1111, providing stable foundation support for the distal end of the thin PCB board 300. The second support block 1113b is located on the two sides of the PCB placement slot 1112 near the first support block 1113a, forming a stable three-point support structure with the first support block 1113a. At the same time, the third support block 1113c is located on the two sides of the PCB placement slot 1112 near the interface mounting slot 1111, ensuring that the thin PCB board 300 also receives reliable support in the interface connection area. This multi-point distributed support not only effectively prevents the thin PCB board 300 from bending and deforming during the reflow process, but also ensures that the electronic components on the PCB board 300 are always kept in the correct horizontal position.

[0039] Further, continue to refer to Figure 3 The first support block 1113a is a strip-shaped structure extending along the width direction of the PCB placement slot 1112; the second support block 1113b has a square structure; and the third support block 1113c is a long strip-shaped structure extending along the length direction of the PCB placement slot 1112, with two adjacent third support blocks 1113c forming a single support block. It can be understood that the support blocks achieve differentiated support for the thin PCB board 300 through different geometric shapes. The first support block 1113a, with its strip-shaped structure extending along the width direction of the PCB placement slot 1112, provides continuous linear support to the far end of the thin PCB board 300, effectively dispersing the support force and preventing localized stress concentration at the far end of the PCB board 300. The second support block 1113b, with its square structure, provides concentrated point support on both sides of the PCB placement slot 1112, ensuring support stability and facilitating the corresponding square clearance holes 310 on the standard PCB board 300. Meanwhile, the third support block 1113c adopts a long strip structure that extends along the length of the PCB placement slot 1112, and two adjacent third support blocks 1113c form a support block as a whole, providing continuous long strip support for the PCB board 300 area near the interface mounting slot 1111, and also enhancing the stability and durability of the support through the integrated structure.

[0040] Alternatively, for different types of PCBs 300, the specific size, position distribution, and quantity configuration of the first support block 1113a, the second support block 1113b, and the third support block 1113c can be adjusted within the PCB placement slot 1112 to adapt to the layout of a specific PCB 300. At the same time, based on the distribution of key electronic components on the PCB 300, special support grooves or protrusions can be designed in the corresponding raised section 1113 area to ensure that important components receive optimal support and protection during the reflow process.

[0041] In some embodiments, refer to Figure 2 , 3 The base plate 100, as described in points 6 and 7, is provided with positioning protrusions 114; the PCB board 300 is provided with positioning holes 320 corresponding to the positions of the positioning protrusions 114. The positioning protrusions 114 are inserted into the positioning holes 320 to position the PCB board 300. By using the positioning protrusions 114 on the base plate 100 as active positioning elements, a precise insertion fit is formed with the preset positioning holes 320 on the PCB board 300. When the PCB board 300 is placed in the PCB placement slot 1112, the positioning protrusions 114 are accurately inserted into the corresponding positioning holes 320. This not only prevents the PCB board 300 from shifting or rotating in the horizontal direction, but also forms a three-dimensional positioning constraint with the vertical support of the raising part 1113, ensuring that the PCB board 300 maintains a stable position during the reflow process.

[0042] Furthermore, two positioning protrusions 114 are provided on each side of each row of PCB mounting areas 110. It can be understood that the four positioning protrusions 114 on each side of each row of PCB mounting areas 110, together with the corresponding four positioning holes 320 on the PCB board 300, form a complete rectangular positioning frame. This multi-point positioning method not only effectively prevents displacement and rotation of the PCB board 300 in any direction, but also significantly improves the positional stability of the PCB board 300 during the reflow process through the synergistic effect of multiple constraint points. Simultaneously, in conjunction with the vertical support of the heightening section 1113, it constitutes a more reliable three-dimensional positioning constraint, thereby effectively resisting the influence of thermal expansion and mechanical vibration on the positional accuracy of the PCB board 300.

[0043] In some embodiments, 2, 4, and 5, the pressure plate 200 includes a first pressure plate 210 and a second pressure plate 220; the first pressure plate 210 is disposed on both sides of the base plate 100, each first pressure plate 210 includes a first portion pressing against the side of the base plate 100 and a second portion extending downward along the side, and the cross-section of the first pressure plate 210 is "L" shaped; the second pressure plate 220 is disposed between two rows of PCB mounting areas 110 and extends along the length direction of the base plate 100, for simultaneously pressing the two rows of PCB boards 300. Understandably, the first part of the first pressure plate 210 presses down on the side of the base plate 100 to provide fixation, while the second part extends downward along the side of the base plate 100 to form lateral constraint. This "L"-shaped structure not only prevents the base plate 100 from shifting during the reflow process but also provides additional structural rigidity to the entire fixture. Meanwhile, the second pressure plate 220 is positioned between the two rows of PCB mounting areas 110 and extends along the length of the base plate 100. Through its pressing action, it simultaneously constrains both rows of PCB boards 300, ensuring that all PCB boards 300 receive uniform and stable pressure in the vertical direction. The cooperation of the first pressure plate 210 and the second pressure plate 220 ensures both the stability of the fixture itself and the reliable fixation of the PCB boards 300.

[0044] Furthermore, refer to Figure 5 The second pressure plate 220 extends along the width direction of the base plate 100, extending into a plurality of symmetrically arranged pressure arms 222. The straight line containing two symmetrical pressure arms 222 lies on the center line of two adjacent positioning slots 111. It is understood that the plurality of symmetrically arranged pressure arms 222 can provide independent clamping force to the PCB board 300 within each positioning slot 111. The symmetrical pressure arms 222 ensure that the pressure arms 222 can accurately act on the boundary area of ​​adjacent PCB boards 300, simultaneously applying pressure to the PCB boards 300 within the two positioning slots 111 while avoiding pressure concentration in the critical circuit areas of the PCB boards 300. This ensures effective clamping while maximizing the protection of precision components on the PCB boards 300. The symmetrical pressure arms 222, together with the positioning protrusions 114 and the heightening part 1113 support system, form a complete three-dimensional constraint and clamping, ensuring that each PCB board 300 achieves a uniform and stable fixing effect.

[0045] Furthermore, refer to Figure 2The base plate 100 has a first magnet 112 at both ends corresponding to the contact portion of the first pressure plate 210; the first pressure plate 210 has a second magnet 211 at the position corresponding to the first magnet 112, and the first magnet 112 and the second magnet 211 are magnetically attracted to each other; the second pressure plate 220 has a third magnet 221 at both ends; the base plate 100 has a fourth magnet 113 at the position corresponding to the third magnet 221, and the third magnet 221 and the fourth magnet 113 are magnetically attracted to each other. Understandably, the first magnets 112 at both ends of the base plate 100 and the corresponding second magnets 211 on the first pressure plate 210 form a magnetic attraction, which allows the first pressure plate 210 with an "L"-shaped cross-section to be quickly and firmly fixed to both sides of the base plate 100 without the need to repeatedly tighten bolts or other mechanical fasteners. At the same time, the third magnets 221 at both ends of the second pressure plate 220 and the corresponding fourth magnets 113 on the base plate 100 also achieve quick positioning and fixation through magnetic attraction. The magnetic connection method not only greatly improves the efficiency of installing and disassembling the pressure plate 200, but also ensures that the pressure plate 200 maintains a stable fixed state during the furnace process.

[0046] In some embodiments, refer to Figure 2 , 3 The base plate 100 has board-retrieving slots 115 at both ends, which are connected to positioning slots 111 at both ends. The board-retrieving slots 115 are located on the line of symmetry between the two PCB boards 300 along the length of the base plate 100, and are used for inserting fingers to grasp the PCB boards 300. It can be understood that the board-retrieving slots 115 form an operating space extending from the positioning slots 111, and their location on the line of symmetry between the two PCB boards 300 along the length of the base plate 100 ensures that the operator can grasp the PCB boards 300. After the pressure plate 200 is removed, the operator can insert their fingers into the board-retrieving slots 115 to directly contact the edge of the PCB board 300 within the positioning slots 111, thereby grasping the PCB board 300 and ensuring the stability and safety of the retrieval process.

[0047] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A furnace fixture, comprising a base plate and a pressure plate, characterized in that: The base plate is a flat plate structure, and two rows of PCB mounting areas are provided on the base plate. The two rows of PCB mounting areas are symmetrically distributed about the center line of the base plate, and each row of PCB mounting areas is provided with multiple positioning slots. Each of the positioning slots includes an interface mounting slot and a PCB placement slot that are interconnected, wherein the depth of the interface mounting slot is greater than the depth of the PCB placement slot. The PCB placement slot is provided with a raised section, the height of which is equal to half the difference between the thickness of the standard PCB board and the thickness of the thin PCB board. When using a standard thickness PCB board, the PCB board is provided with clearance holes corresponding to the height increase section; The pressure plate cooperates with the base plate to press the PCB board located in the installation area.

2. The furnace fixture according to claim 1, characterized in that, Each of the PCB placement slots has a plurality of the aforementioned heightening portions along its circumferential edge.

3. The furnace fixture according to claim 2, characterized in that, The heightening section includes a first support block, a second support block, and a third support block. The first support block is disposed on the side of the PCB placement slot away from the interface mounting slot. The second support block is disposed on the two sides of the PCB placement slot close to the first support block. The third support block is disposed on the two sides of the PCB placement slot close to the interface mounting slot.

4. The furnace fixture according to claim 3, characterized in that, The first support block is a strip-shaped structure extending along the width direction of the PCB placement slot; The second support block has a square structure; The third support block is a long strip structure extending along the length of the PCB placement slot, and two adjacent third support blocks constitute a support block as a whole.

5. The furnace fixture according to claim 1, characterized in that, The base plate is provided with positioning protrusions; The PCB board has positioning holes corresponding to the positions of the positioning protrusions, and the positioning protrusions are inserted into the positioning holes to position the PCB board.

6. The furnace fixture according to claim 5, characterized in that, Two positioning protrusions are provided on each side of the PCB mounting area.

7. The furnace fixture according to claim 1, characterized in that, The pressure plate includes a first pressure plate and a second pressure plate; The first pressure plate is disposed on both sides of the base plate. Each first pressure plate includes a first part that presses down on the side of the base plate and a second part that extends downward along the side. The cross-section of the first pressure plate is L-shaped. The second pressure plate is located between the two rows of PCB mounting areas and extends along the length of the base plate to simultaneously press the two rows of PCB boards.

8. The furnace fixture according to claim 7, characterized in that, The second pressure plate extends along the width direction of the base plate to form a plurality of symmetrically arranged pressure arms; The straight line containing the two symmetrical pressure arms is located on the center line of two adjacent positioning slots.

9. The furnace fixture according to claim 7, characterized in that, The base plate is provided with a first magnet at both ends corresponding to the part that contacts the first pressure plate; The first pressure plate is provided with a second magnet at the position corresponding to the first magnet, and the first magnet and the second magnet are magnetically attracted to each other; a third magnet is provided at each end of the second pressure plate. The base plate is provided with a fourth magnet at the position corresponding to the third magnet, and the third magnet and the fourth magnet are magnetically attracted to each other.

10. The furnace fixture according to claim 1, characterized in that, The base plate is provided with plate-retrieving grooves at both ends, and the plate-retrieving grooves are respectively connected to the positioning grooves at both ends; The board picking slot is located on the symmetrical line between the two PCB boards along the length of the base plate, and is used for inserting fingers to pick up the PCB board.

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