A metal barrier
By designing a flexible metal barrier, the problems of cross-flow of hot and cold gases and nitrogen leakage caused by temperature differences in the reflow oven were solved, achieving effective isolation and improved cleanliness in high-temperature environments, and adapting to changes in track spacing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI LANGSHI ELECTRONIC EQUIP CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-10
AI Technical Summary
Existing metal barriers cannot effectively solve the problems of cross-flow of hot and cold gases caused by temperature differences, nitrogen regulation risks, ineffective space and dust generation in reflow ovens, and cannot adapt to changes in track spacing.
Design a metal barrier using metal plates, welded blocks, end face fixing units, and guide pipes. It can move flexibly through guide grooves and fixing blocks to adapt to track changes and isolate the furnace interior from the external environment.
It effectively isolates the flow of hot and cold gases in high-temperature environments, stabilizes the temperature of the reflux zone, reduces nitrogen leakage, avoids dust generation, and adapts to changes in track spacing, thereby improving cleanliness and temperature stability.
Smart Images
Figure CN224475691U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of metal barrier technology, and in particular to a metal barrier. Background Technology
[0002] Currently, in reflow ovens, the temperature settings of the reflow zone and the adjacent first cooling zone are different, resulting in a certain temperature difference.
[0003] Because the PCB board passes through these temperature zones sequentially, the transport channels between different temperature zones are interconnected. The PCB board is placed on the support pins of the chains within the tracks. Two tracks and two chains within them support the sides of the PCB board and transport it within the furnace. When customers use PCB boards with smaller widths, the track spacing decreases, but the effective width of the furnace remains unchanged. In this case, the ineffective space between the tracks and the sides of the furnace increases, leading to the following defects:
[0004] First, since the reflux zone is close to the first cooling zone, there is an issue of intermingling and flow between hot and cold gases. When hot air flows into the cooling zone, it affects the cooling efficiency; when cold air enters the reflux zone, it affects the stability of the reflux process temperature.
[0005] Second, in order to ensure a low oxygen content in the reflux zone, a certain amount of nitrogen is usually introduced into the reflux zone. However, when nitrogen is introduced, some of it will flow into the cooling zone, so there is an uncontrollable risk in adjusting the oxygen content.
[0006] Third, the conventional method is to install a fixed metal barrier on one side of the guide rail. This barrier does not move with the guide rail and only provides some barrier function when the track spacing is at its maximum. When the track spacing decreases, the ineffective space between the track and the side of the furnace still exists.
[0007] Fourth, since the location is within the reflow zone, which is not only a high-temperature environment but also filled with flux-laden gases, ordinary flexible partition materials are not suitable for installation in this location.
[0008] Fifth, existing foldable barriers will generate a certain amount of dust in continuous high-temperature environments, and cannot be used in equipment with high cleanliness requirements.
[0009] Utility model patent CN215518457U discloses an insert-type railway metal wind barrier, composed of H-shaped steel columns and metal wind barrier unit panels. The metal wind barrier unit panel is a shell-shaped box-shaped plate composed of two bent, perforated metal panels with upper, lower, left, and right side plates, supporting profiles, and rubber components. It belongs to the field of windproof technology in railway engineering. It includes H-shaped steel columns and metal wind barrier unit panels. Each unit panel consists of two integrally bent, perforated metal panels with upper, lower, left, and right side plates, supporting profiles, and rubber components. The railway wind barrier unit panels are inserted into the H-shaped steel columns to form a wind barrier system. However, the barrier in this patent cannot adapt to the curvature of the guide rails.
[0010] Therefore, providing a flexible metal barrier is an urgent problem to be solved. Utility Model Content
[0011] The purpose of this invention is to overcome the defects of the existing technology and provide a metal barrier.
[0012] The objective of this utility model can be achieved through the following technical solutions:
[0013] According to one aspect of the present invention, a metal barrier is provided for isolating a furnace chamber, comprising a metal plate, a welding block, an end-face fixing unit, a moving unit, and two guide tubes. The two guide tubes are connected by the welding block, the end-face fixing unit is installed at both ends of the two guide tubes, the metal plate is installed on the two guide tubes, the moving unit is installed on the metal plate, and the two guide tubes are installed on the furnace chamber by the end-face fixing unit.
[0014] As a preferred technical solution, the moving unit includes a first guide rail fixing block and a second guide rail fixing block, the second guide rail fixing block is mounted on a metal plate, and the first guide rail fixing block is mounted on the first guide rail fixing block.
[0015] As a preferred technical solution, the first guide rail fixing block and the second guide rail fixing block are perpendicular and combined to form an L-shape.
[0016] As a preferred technical solution, the furnace includes a track, and the track is connected to a first guide rail fixing block.
[0017] As a preferred technical solution, the second guide rail fixing block and the metal plate are movably connected.
[0018] As a preferred technical solution, the guide tube includes a sliding groove, and the sliding grooves of the two guide tubes are arranged opposite to each other.
[0019] As a preferred technical solution, the metal plate is installed in the sliding groove.
[0020] As a preferred technical solution, both guide tubes include a bent portion, and the welding block is installed at both ends of the bent portion.
[0021] As a preferred technical solution, the end face fixing unit includes an end face fixing ring, which is installed on the end of the guide tube.
[0022] As a preferred technical solution, the end face fixing unit further includes an end face fixing block, which is installed on the end face fixing ring of the same side guide tube.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] 1. This utility model uses a metal plate as a barrier. Based on the good ductility of metal, it can change accordingly under the guidance of the moving unit. The metal material is different from conventional non-woven fabrics and fiber materials and will not produce dust. It has the characteristics of high temperature resistance and corrosion resistance, which is superior to conventional foldable soft barriers and will not be corroded by flux in the furnace.
[0025] 2. This utility model is equipped with an end face fixing unit, which not only fixes the guide tube but also restricts the movement range of the metal plate.
[0026] 3. The guide tube of this utility model is provided with a guide groove to guide the movement of the metal plate, and the guide grooves on different guide tubes are arranged opposite to each other to enhance the guiding effect.
[0027] 4. The first guide rail fixing block and the second guide rail fixing block of this utility model are perpendicular to each other. The first guide rail fixing block is interlocked with the chain guide rail inside the furnace, thereby realizing the opening or closing of the metal barrier. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0029] Figure 2 This is a schematic diagram of the end face fixing unit of this utility model;
[0030] Figure 3 This is a schematic diagram of the mobile unit structure of this utility model;
[0031] Figure 4 This is a schematic diagram of the installation of the welding block of this utility model;
[0032] Figure 5 This is an installation diagram of the present invention;
[0033] Figure 6 This is a schematic diagram illustrating the movement of this utility model;
[0034] 1. Metal plate; 2. Guide tube; 3. Welding block; 4. End face fixing ring; 5. End face fixing block; 6. First guide rail fixing block; 7. Second guide rail fixing block; 8. Rail. Detailed Implementation
[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.
[0036] This invention provides a metal barrier that dynamically separates the internal and external environments of the furnace by moving along a track. The barrier uses a metal plate, which, due to its good ductility, changes shape under the guidance of a moving unit. Unlike conventional non-woven fabrics and fibers, the metal material does not produce dust; it is also heat-resistant and corrosion-resistant, surpassing conventional foldable soft barriers and is not corroded by flux inside the furnace. This invention includes an end-face fixing unit that fixes the guide tubes while limiting the movement range of the metal plate. Guide grooves are provided on the guide tubes to guide the movement of the metal plate, and the guide grooves on different guide tubes are arranged opposite each other to enhance the guiding effect. The first and second guide rail fixing blocks are perpendicular, and the first guide rail fixing block interlocks with the chain guide rail inside the furnace, thereby opening or closing the metal barrier.
[0037] Example 1
[0038] like Figures 1-6 As shown, a metal barrier for isolating a furnace includes a metal plate 1, a welding block 3, an end-face fixing unit, a moving unit, and two guide tubes 2. The two guide tubes 2 are connected by the welding block 3. The end-face fixing unit is installed at both ends of the two guide tubes 2. The metal plate 1 is installed on the two guide tubes 2. The moving unit is installed on the metal plate 1. The two guide tubes 2 are installed on the furnace through the end-face fixing unit.
[0039] The moving unit includes a first guide rail fixing block 6 and a second guide rail fixing block 7. The second guide rail fixing block 7 is mounted on the metal plate 1, and the first guide rail fixing block 6 is mounted on the first guide rail fixing block 7. The first guide rail fixing block 6 and the second guide rail fixing block 7 are perpendicular and combined to form an L-shape. The furnace chamber includes a track 8, which is connected to the first guide rail fixing block 6. The second guide rail fixing block 7 is movably connected to the metal plate 1.
[0040] The guide tube 2 includes a sliding groove, and the sliding grooves of the two guide tubes 2 are arranged opposite to each other. The metal plate 1 is installed in the sliding groove. Both guide tubes 2 include a bent portion, and the welding block 3 is installed at both ends of the bent portion.
[0041] The end face fixing unit includes an end face fixing ring 4, which is installed on the end of the guide tube 2. The end face fixing unit also includes an end face fixing block 5, which is installed on the end face fixing ring 4 of the same side guide tube 2.
[0042] In this embodiment, to improve the flexibility of the barrier, a thin metal steel plate is used as the barrier, achieved by changing the thickness of the metal. An arc-shaped guide tube 2 is designed as a guide, comprising two guide tubes 2, one above the other. Each guide tube 2 has a guide groove. The upper and lower ends of the thin steel plate 1 are embedded into the guide grooves of the upper and lower guide tubes 2, thereby fixing the relative position of the metal plate 1. The flexibility of the metal plate 1 itself allows it to slide smoothly within the curved guide tubes 2.
[0043] One end of the guide rail (i.e., guide tube 2) of the metal plate 1 is fixed to the side of the furnace, and the other end is fixed to the chain track 8 of the furnace. The track 8 extends into the furnace, and the metal plate 1 and the chain track move together. When the spacing of the chain track decreases, the chain track pulls the metal plate 1 out of the track of the guide tube 2, thereby sealing the ineffective space between the outside of the chain track and the side of the furnace. When the spacing of the chain track increases, the chain guide rail pushes the metal plate 1 into the track of the guide tube 2 and hides it inside the guide tube 2 on the side of the furnace.
[0044] The structure of the flexible metal barrier of this utility model is explained as follows: First, the two guide pipes 2 are welded together with the welding block 3, and their guide spacing is fixed; then, the end face fixing ring 4 is fitted into the two end faces of the upper and lower guide pipes 2, and the end face fixing ring 4 is locked by the end face fixing plate 5 to make them a whole. The first guide rail fixing block 6 and the second guide rail fixing block 7 clamp the metal plate 1. The first guide rail fixing block 6 can be interlocked with the chain guide rail in the furnace to realize the interconnection between the metal plate 1 and the chain guide rail in the furnace.
[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A metal barrier for isolating a furnace, characterized in that, It includes a metal plate (1), a welding block (3), an end face fixing unit, a moving unit, and two guide tubes (2). The two guide tubes (2) are connected by the welding block (3). The end face fixing unit is installed at both ends of the two guide tubes (2). The metal plate (1) is installed on the two guide tubes (2). The moving unit is installed on the metal plate (1). The two guide tubes (2) are installed on the furnace through the end face fixing unit.
2. A metal barrier according to claim 1, characterized in that, The moving unit includes a first guide rail fixing block (6) and a second guide rail fixing block (7). The second guide rail fixing block (7) is mounted on a metal plate (1), and the first guide rail fixing block (6) is mounted on the first guide rail fixing block (6).
3. A metal barrier according to claim 2, characterized in that, The first guide rail fixing block (6) and the second guide rail fixing block (7) are perpendicular to each other and combined to form an L-shape.
4. A metal barrier according to claim 2, characterized in that, The furnace chamber includes a track (8) and a first guide rail fixing block (6).
5. A metal barrier according to claim 2, characterized in that, The second guide rail fixing block (7) and the metal plate (1) are movably connected.
6. A metal barrier according to claim 1, characterized in that, The guide tube (2) includes a sliding groove, and the sliding grooves of the two guide tubes (2) are arranged opposite to each other.
7. A metal barrier according to claim 6, characterized in that, The metal plate (1) is installed in the sliding groove.
8. A metal barrier according to claim 1, characterized in that, Both guide tubes (2) include a bend, and the welding block (3) is installed at both ends of the bend.
9. A metal barrier according to claim 8, characterized in that, The end face fixing unit includes an end face fixing ring (4), which is installed on the end of the guide tube (2).
10. A metal barrier according to claim 9, characterized in that, The end face fixing unit also includes an end face fixing block (5), which is installed on the end face fixing ring (4) of the same side guide tube (2).