Unit furnace combined type vacuum reflow furnace

Abstract

The utility model relates to a unit furnace combined type vacuum reflow oven which comprises a reflow oven frame, a plurality of unit furnaces are detachably assembled in the reflow oven frame, each unit furnace is provided with an independent working cavity, a heat source and a refrigerant are arranged in each working cavity, and each working cavity independently completes heating and cooling processes. And products of multiple specifications can be welded on the same assembly line of the same reflow furnace.

Description

TECHNICAL FIELD

[0001] The utility model relates to vacuum reflow soldering furnace technical field, especially a unit furnace combination formula vacuum reflow furnace. BACKGROUND

[0002] The reflow furnace is a kind of equipment that realizes welding by providing heating environment and making solder paste or preformed soldering piece melt.

[0003] At present, the reflow furnace on market is usually arranged with multiple chambers to form a complete reflow furnace, and the temperature in multiple chambers is different, including welding part of step-up temperature and cooling part of step-down temperature.

[0004] The defect of this integral reflow furnace is that the working condition of temperature in furnace is single after the product to be welded enters the reflow furnace, if the welding of different products needs to be adapted, the temperature in integral reflow furnace needs to be adjusted, and the adjustment time is long, and the temperature control precision requirement is high, causing the problem of low welding efficiency. UTILITY MODEL CONTENTS

[0005] The applicant provides a unit furnace combination formula vacuum reflow furnace with reasonable structure in view of the defects in the above existing production technology, multiple detachable unit furnaces are arranged in a reflow furnace frame, each unit furnace can heat and weld and cool the whole process of a group of products to be welded, avoids the feeding step of multiple conveying in different chambers in conventional reflow furnace, and is more conducive to precisely controlling the processing temperature and quality of the same batch of products to be welded.

[0006] The technical scheme adopted by the utility model is as follows:

[0007] A unit furnace combination formula vacuum reflow furnace, including reflow furnace frame, multiple unit furnaces are detachably assembled in the reflow furnace frame, each unit furnace is provided with independent working cavity, heat source and refrigerant are arranged in each working cavity, and each working cavity independently completes heating and cooling process.

[0008] As a further improvement of the above technical scheme:

[0009] The heat source in working cavity includes:

[0010] Heating panel is located in working cavity and is in electric conduction with external power supply,

[0011] Insulating plate is clamped on the upper and lower sides of heating panel,

[0012] Metal heat-conducting plate is capped on the top of heating panel and insulating plate.

[0013] The insulating plate and ceramic plate are all multiple splicing structures, and the heat source groups are spliced by leaving gaps between adjacent heat source groups.

[0014] Supporting rods are arranged in the gap between adjacent heat source groups, and the supporting rods support the metal heat-conducting plates.

[0015] The structure for cooling in the working cavity comprises at least two pipelines, and the refrigerant in the pipelines flows in multiple directions.

[0016] The working cavity is provided with a refrigerant outlet and a refrigerant inlet on the cavity wall, and each pipeline is provided with independent refrigerant outlets and refrigerant inlets.

[0017] The gripper is arranged on the top of the reflow furnace frame and moves along the arrangement direction of the unit furnace.

[0018] The single set of grippers can grasp one full load tooling and send it into any working cavity at a time.

[0019] The beneficial effects of the utility model are as follows:

[0020] Compared with the conventional reflow furnace, the most obvious advantage of the utility model is that the welding of products of different specifications can be performed on the same assembly line of the same reflow furnace.

[0021] When the products are conveyed into the reflow furnace by the conveying belt, the product specifications are identified by the sensor, and after entering the reflow furnace, each unit furnace is provided with independent working cavities, and the working cavities are provided with complete heating and cooling structures, which can provide corresponding heating and cooling temperatures for the products on the same tooling.

[0022] The working cavities of the utility model are different from the conventional horizontal conveying, and the products are in a stationary state during the welding process and do not move in the horizontal direction.

[0023] The graphite surface heating is adopted in each working cavity instead of linear heating, and the double-circuit same-in same-out water cooling is adopted instead of single-pipe cooling, so that the heating and cooling speeds are improved, and the welding efficiency is improved.

[0024] In each working cavity, the heat plate is provided with a supporting rod for support, and since the heat plate uniformly generates heat and has a large heating area, the effective heating area is larger than that of the conventional linear heating during work, and the edge position of the heated surface will not be insufficiently heated or have low temperature, and the heat plate area is the effective area.

[0025] This utility model's integrated reflow oven is formed by combining multiple unit ovens. It can be modularly assembled and used according to actual needs. For example, when the required production capacity is small, a small number of unit ovens can be used to assemble the reflow oven; if the production capacity is large, more unit ovens can be used. Within the same workshop, the unit ovens can be flexibly combined and used. Attached Figure Description

[0026] Figure 1-1 This is a schematic diagram of the front of the frame structure of this utility model, showing buttons and a display screen.

[0027] Figure 1-2 The bottom of this utility model is a schematic diagram of the frame structure, used to show the space inside the frame for accommodating the unit furnace.

[0028] Figure 2 This is a side view of a unit furnace of this utility model.

[0029] Figure 3 This is a perspective view of a unit furnace of this utility model.

[0030] Figure 4 This is a three-dimensional view of a working cavity of the present invention.

[0031] Figure 5 This is a perspective view of a working cavity of the present invention, with a hidden cover plate in the figure.

[0032] Figure 6 This is a cross-sectional view of a working cavity of this utility model.

[0033] Figure 7 for Figure 6 The enlarged view of part A is used to illustrate the combined structure of the heating assembly.

[0034] Figure 8 This is an exploded schematic diagram of the heating component of this utility model.

[0035] Figure 9 This is a schematic diagram of the train's structure.

[0036] Figure 10 This is a schematic diagram of a clamping structure on a crane.

[0037] Figure 11 for Figure 10 The enlarged view of section B is used to illustrate the fit between the gripper and the tooling.

[0038] The components include: 1. Frame; 2. Unit furnace; 3. Working chamber; 4. Heating assembly; 5. Cooling assembly; 6. Gripping device;

[0039] 301. Housing; 302. Slide rail; 303. Lifting component; 304. Cover plate;

[0040] 401, support rod; 402, support ceramic plate; 403, graphite plate; 404, ceramic cover plate; 405, metal plate;

[0041] 501, pipeline;

[0042] 601, travelling crane; 602, clamping jaw; 603, plate body; 604, y-direction sliding rail; 605, y-direction sliding plate; 606, z-direction motor; 607, lifting screw; 608, grasping reference plate; 609, positioning protrusion; 610, positioning counterbore. DETAILED DESCRIPTION

[0043] The specific implementation of the present application will be described below in combination with the drawings.

[0044] As shown in FIG. 1- Figure 11 The unit furnace 2 combined vacuum reflow furnace of the present embodiment includes a reflow furnace frame 1, and a plurality of unit furnaces 2 are detachably assembled in the reflow furnace frame 1. Each unit furnace 2 has an independent working cavity 3, a heat source and a coolant are arranged in each working cavity 3, and each working cavity 3 independently completes the heating and cooling processes.

[0045] The heat source in the working cavity 3 includes:

[0046] A heating panel is located in the working cavity 3 and is in electrical conduction with an external power supply,

[0047] An insulating plate is clamped on the upper and lower sides of the heating panel,

[0048] A metal heat-conducting plate is capped on the top of the heating panel and the insulating plate.

[0049] The insulating plate and the ceramic plate are both in a plurality of spliced structures, and a heat source group is obtained by splicing. A gap is reserved between adjacent heat source groups.

[0050] A support rod 401 is arranged in the gap between adjacent heat source groups, and the support rod 401 supports the metal heat-conducting plate.

[0051] The structure for cooling in the working cavity 3 includes at least two pipelines 501, and the coolant in the pipelines 501 flows in multiple directions.

[0052] A coolant outlet and a coolant inlet are led out on the cavity wall of the working cavity 3, and each pipeline 501 is provided with a coolant outlet and a coolant inlet which are independent of each other.

[0053] A clamping jaw 602 is slidably arranged on the top of the reflow furnace frame 1, and the movement direction of the clamping jaw 602 is set along the arrangement direction of the unit furnaces 2.

[0054] One set of clamping jaws 602 grasps one full load tooling at a time and sends it into any working cavity 3.

[0055] The welding method of the multi-functional vacuum reflow soldering furnace comprises the following steps:

[0056] The product identification stage:

[0057] The product to be welded is sent into the reflow furnace by the conveyor belt, and a sensor for identifying the product type is arranged on the movement path of the conveyor belt,

[0058] The welding stage:

[0059] The product to be welded is placed into an open cover working cavity 3 in the reflow furnace by the gripper, the cover plate 304 of the working cavity 3 is closed to form a sealed cavity, the heating assembly 4 in the working cavity 3 is powered to heat to the expected temperature, then the heating is stopped, and the cooling assembly 5 is powered to cool down, thus the welding is completed,

[0060] The cover plate 304 of the working cavity 3 is opened, the gripper 602 grabs the tooling with the finished product, and the tooling is output outside the reflow furnace.

[0061] During the feeding process of the same reflow furnace, the products to be welded of multiple specifications are allowed to be fed.

[0062] The specific structure and working process of the reflow furnace are as follows:

[0063] The reflow furnace provided by the utility model does not need to sort and arrange the products to be welded, and can process multiple products on a production line at the same time, thereby improving the applicability and processing efficiency.

[0064] As shown in FIG. 1 and Figure 2 、 Figure 3 The reflow furnace comprises a frame 1, multiple unit furnaces 2 can be flexibly installed in the frame 1, each unit furnace 2 is provided with a heating source and a cooling source, and each unit furnace 2 is further provided with a working cavity 3.

[0065] A conveyor belt is arranged at the inlet of the reflow furnace, the conveyor belt sends the product to be welded into the inlet of the reflow furnace, the gripper 602 is driven by the crane 601 to clamp the tooling with the product to be welded, the tooling is placed into the open working cavity 3, then the working cavity 3 is closed, the product to be welded is heated and cooled in the working cavity 3 until the welding is completed, then the working cavity 3 is opened, and the tooling is taken out by the gripper 602.

[0066] The action of closing the working cavity 3 is realized by the slide rail 302 and the lifting piece 303. Figure 4As shown, the two sides of the working cavity 3 are provided with slide rails 302, and a cylinder is slidably connected on the slide rails 302 as a lifting piece 303, and the top of the lifting piece 303 is provided with a cover plate 304. When the cover plate 304 is in an open state, there is a horizontal and vertical distance between the cover plate 304 and the opening of the box body 301 of the working cavity 3, and when the cover plate 304 needs to be closed, the lifting piece 303 still lifts the cover plate 304, and the lifting piece 303 slides along the slide rail 302 with the cover plate 304 until the cover plate 304 is located directly above the opening of the working cavity 3, and then the lifting piece 303 falls to press the cover plate 304 on the opening of the box body 301. A sealing ring is arranged between the box body 301 and the cover plate 304.

[0067] At this time, the product to be welded is located in the closed working cavity 3, and the heating assembly 4 is started. The heating assembly 4 adopts graphite panels and metal plates 405 for heating, and an insulating layer for heat insulation is further arranged between the graphite panels and the metal plates 405. In the embodiment, the insulating layer adopts ceramic plates.

[0068] The specific structure is shown in Figures 5-8 As shown, the bottommost layer of the heating assembly 4 is a supporting ceramic plate 402, the top surface of the supporting ceramic plate 402 is concave to form a space for accommodating a graphite plate 403. The supporting ceramic plate 402 is provided with a plurality of pieces, and each piece is provided with a graphite plate 403. A spacing is reserved between two adjacent supporting ceramic plates 402, and a support rod 401 is arranged in the spacing to play a supporting and positioning role. A ceramic cover plate 404 is arranged above each graphite plate 403, and a whole metal plate 405 is arranged above all the ceramic cover plates 404. Thus, the assembly of the heating assembly 4 is completed.

[0069] After power-on, the graphite panel is heated, and the whole graphite panel is an effective heating surface, that is, the whole metal plate 405 is a uniform effective heating surface.

[0070] According to the actual working condition, the heating temperature of the graphite plate 403 can be set to multiple gradients for gradual heating. After heating is completed, the graphite plate 403 stops heating, and the cooling assembly 5 cools the environment in the working cavity 3.

[0071] In an embodiment of the utility model, the cooling assembly 5 is composed of two pipelines 501, each pipeline 501 is respectively provided with a water inlet and a water outlet, and the fluid flow directions in the two pipelines 501 are opposite or opposite, and in the embodiment, the opposite flow direction scheme in the two serpentine pipes is preferred, the cooling assembly 5 adopts double-loop serpentine pipes, and the refrigerants in the two serpentine pipes, such as cooling water, are bidirectionally input and output at the same time, so that the cooling efficiency is improved.

[0072] The to-be-welded product is heated in the same working cavity 3 in stages until the expected temperature, then the heating is stopped, the refrigerant is input into the cooling pipeline 501 to cool the temperature in the working cavity 3. After the cooling is completed, the cover plate 304 of the working cavity 3 is opened, and the clamping jaw 602 takes out the work fixture with the finished product and sends it to the expected position.

[0073] The travelling crane of the grabbing device is installed on the top of the rack and reciprocates on the rack to drive the clamping jaw to move in three directions and grab the work fixture at the specified position.

[0074] As shown in Figure 9 and Figure 10 , in an embodiment of the utility model, two travelling cranes 601 are arranged on a rack beam, and the structure of each travelling crane 601 is referred to Figure 10 , which can move in three directions. The rack beam is taken as the x direction, the travelling crane 601 moves along the rack beam, the travelling crane 601 body is provided with a plate body 603 in the horizontal plane, the y direction slide rail 604 is arranged on the plate body 603, and the y direction slide plate 605 is connected to the y direction slide rail 604. The z direction motor 606 is penetrated through the y direction slide plate 605, the z direction motor 606 drives the lifting lead screw 607 through belt transmission, and the lifting lead screw 607 bottom is connected to the grabbing reference plate 608. That is, the grabbing reference plate 608 can reciprocate in the x direction, the y direction and the z direction.

[0075] Two clamping jaws 602 are installed on the side of the grabbing reference plate 608 facing the work fixture, the two clamping jaws 602 are arranged in an openable and closable mode, the opposite surfaces of the two clamping jaws 602 are provided with positioning protrusions 609, and correspondingly, the two sides of the work fixture are provided with positioning counterbores 610 for accommodating the positioning protrusions 609. When the clamping jaws 602 are closed, the positioning protrusions 609 fall in the positioning counterbores 610, the work fixture is limited, and the work fixture can be completely limited and grabbed.

[0076] The advantage of the utility model lies in that the structure of the travelling crane 601 and the clamping jaw 602 can reduce the inertia when the work fixture is transported, the work fixture with multiple workpieces can complete the heating welding and cooling work in one working cavity 3, and the efficiency and the yield are improved.

[0077] The above description is an explanation of the utility model, not a limitation of the utility model, the scope defined by the utility model is referred to the claims, and any form of modification is allowed within the protection scope of the utility model.

Claims

1. A unit furnace combined vacuum reflux furnace, characterized in that: The system includes a reflow oven frame (1), within which multiple unit furnaces (2) can be detachably assembled. Each unit furnace (2) has an independent working chamber (3), and each working chamber (3) is equipped with a heat source and refrigerant. Each working chamber (3) independently completes the heating and cooling processes. The heat sources within the working chamber (3) include: The heating panel is located inside the working chamber (3) and is connected to an external power source. Insulating plates are clamped on the upper and lower sides of the heating panel. A metal heat-conducting plate is placed on top of the heating panel and the insulation plate. The cooling structure inside the working chamber (3) includes at least two pipes (501), in which the refrigerant flows in multiple directions.

2. The unit furnace combined vacuum reflux furnace as described in claim 1, characterized in that: Both the insulating plate and the ceramic plate are multi-piece splicing structures, which are spliced ​​together to form a heat source group, with a gap reserved between adjacent heat source groups.

3. The unit furnace combined vacuum reflux furnace as described in claim 2, characterized in that: A support rod (401) is installed in the gap between adjacent heat source groups, and the support rod (401) supports the metal heat-conducting plate.

4. The unit furnace combined vacuum reflux furnace as described in claim 1, characterized in that: The working chamber (3) has a refrigerant outlet and a refrigerant inlet on its wall. Each pipe (501) is equipped with an independent refrigerant outlet and a refrigerant inlet.

5. The unit furnace combined vacuum reflux furnace as described in claim 1, characterized in that: The top of the reflux furnace frame (1) is equipped with a sliding gripper (602), and the movement direction of the gripper (602) is set along the arrangement direction of the unit furnace (2).

6. The unit furnace combined vacuum reflux furnace as described in claim 5, characterized in that: A single set of grippers (602) can grab a fully loaded tooling at a time and send it into any working chamber (3).

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