vacuum furnace
In order to better explain the electrical control system, the mechanical
structure of this type of vacuum aluminum brazing furnace is first introduced,
as shown in Figure 1. The main body of the vacuum aluminum brazing furnace is
composed of a heating chamber, a furnace body, a front and back stove door and
various functional parts. The heating chamber is installed in the furnace body
and consists of a plurality of heating resistors and insulation layers. The
heating resistors are connected by the electrodes and cables outside the furnace
body to form 28 heating zones. Each zone is powered by a set of thyristor
voltage regulating power supply circuit. The furnace body is a double-layer
water-cooled jacket structure with the necessary functional components of
brazing furnace welded on it. The front and rear doors are also double-layer
water-cooled jacket structure, which can be mounted on the door car which can
move vertically along the axis of the furnace body. The door can also be moved
horizontally along the axis of the furnace body by the cylinder driving on the
door car. The translation of the two directions of the door enables the door to
open. And close.
The peripheral system of vacuum brazing furnace includes
vacuum system, water cooling system, gas charging system, pneumatic system and
charging car outside furnace.
Aluminum alloy brazing requires a very high
vacuum system. The vacuum system should not only have strong enough vacuum
acquisition capacity, but also have sufficient capacity to ensure that the
vacuum degree in the furnace is kept at 10-3Pa order of magnitude when a large
amount of gas evaporates during the pre-brazing and final brazing stages. Speed
up. The vacuum brazing furnace is equipped with 5 sets of vacuum units, each set
of vacuum unit configuration: the main pump is a high vacuum oil diffusion pump,
oil diffusion pump is a kind of steam jet pump, it has the advantages of high
pumping speed, high vacuum limit: the role of mechanical pump unit is
pre-pumping vacuum and as a diffusion pump of the front pump, it is by Roots
pump And slide valve pump composition: maintenance pump using rotary vane pump,
it can ensure that the equipment starts to work before the diffusion pump
pre-heating pump chamber to maintain a certain degree of vacuum, but also ensure
that after the completion of work in the diffusion pump cooling process, in
order to save energy and shut down Roots pump and slide valve pump, diffusion
pump will not appear when the oil oxidation; The valves of each vacuum unit
include large valves, front valves, pre draining valves and unit bleeder valves.
The water cooling system is used to cool the brazing furnace wall, diffusion
pump, roots pump, slide valve pump and rotary vane pump. The main intake pipe
installs the electric contact pressure gauge, and alarm when the water supply
pressure is insufficient. The water flows through the cooling component to the
return channel, and the return channel is connected with the main return pipe.
The device has an inert gas inflatable interface and equipped with manual ball
valves and manual needle valves. According to the need, nitrogen replacement can
be realized in the pre vacuum pumping stage.
The equipment is equipped with
pneumatic system. The system is composed of air source triple parts, pipelines,
seals and other components. The pneumatic system pipeline can withstand pressure
of 0.8-1 MPa. It is used for components driven by cylinders on the equipment,
including large valves, front-stage valves, pre-suction valves and front and
rear furnace doors. Workpiece truck is used to load and unload workpieces. Its
main body is the frame. The size of the frame matches the maximum size of the
workpiece after loading and unloading. The structure strength is enough to bear
the total mass of the load. The track fixed on the ground is used to support the
frame and guide the movement of the frame. The advance and retreat of the frame
are driven by a reduction motor (power 2.2kW) fixed in the pit. The frame moves
toward the furnace body to realize the docking of the guide rail on the frame
and the square section guide rail in the heating chamber. The other group is
fixed on the frame to reduce the speed. The motor (power is 2.2kW) drives the
workpiece trailer which can move along the guide rail to move forward and
backward, so that the workpiece moving with the roller assembly moves in and out
along the furnace and the guide rail on the frame to realize the loading and
unloading process. The movement of the frame and the entry and exit of the
workpiece have the limit of the travel switch, which realizes the accurate
docking of the guide rail and the arrival and exit of the workpiece.
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VACUUM HEATING FURNACE WORKING PRINCIPLE