Glue dispensing valve is an industrial equipment used for precise control of glue
or other liquid coating, widely used in fields such as optics, optoelectronics,
biochemistry, semiconductors, and automotive manufacturing. It is suitable for
high-precision fluid operations such as UV glue and silicone.
structure
Pneumatic adhesive valve: It is composed of three parts connected up and down:
cylinder, valve body, and material cylinder. The cylinder and valve body are
separated by advanced sealing materials to prevent adhesive from entering
cylinder 23.
Electric dispensing valve: including pump body and driving part, with
accompanying stator, adopting a fixed rotor structure design, the rotor and stator
pair form a self sealing structure.
role
Fluid control: Accurate delivery and control of glue are achieved through
pneumatic or electric structures to ensure the quantitative coating of glue.
Preventing Dripping: Adopting an upward suction sealing structure, it instantly
sucks back and breaks the glue when stopping, reducing residual glue on the
needle and avoiding dripping, drawing and other phenomena.
Adaptation to automation: It can be connected to storage buckets for high-speed
glue supply, adapt to the needs of automated production lines, and improve
production efficiency and dispensing accuracy by 24.
As a key component of fluid control, dispensing valves play an important role
in intelligent manufacturing, ensuring the improvement of product quality and
production efficiency.
Introduction to the working principle,
composition, and types of dispensing
valves
1 、Working principle
Pneumatic working principle: Glue is loaded into a pressure tank, and compressed air
enters the pressure tank (storage tank) to press the glue into the feed pipe connected to
the material cylinder chamber; Backsuction dispensing valve: sends a signal to the
solenoid valve to drive the dispensing valve piston to move downwards, and the glue
passes through the material cylinder and is pressed out from the needle. Top needle
dispensing valve: It moves in the opposite direction to the suction dispensing valve,
giving a signal to the solenoid valve to drive the dispensing valve piston to move
upward. The glue passes through the material cylinder and is pressed out from the
needle. The amount of glue dripped is determined by three factors: the control solenoid
valve time, the pressure of the pressure bucket, and the piston movement stroke (fine
adjustment of the dispensing valve), which can be freely matched on any automation
equipment. The electric working principle adopts a single screw structure,
Using the principle of single screw volumetric conveying, the rotor and stator
form a self sealing structure, and the directional rotation of the rotor in the
stator cavity achieves the function of medium conveying.
2 、Frequently Asked Questions
How to effectively and quickly eliminate problems with rubber valves: The
following are effective methods to solve common problems that occur during
the use of rubber valves
The situation of glue valve dripping often occurs after the glue valve is closed.
95% of this situation is caused by the small diameter of the needle used A needle
that is too small can affect the flow of liquid and cause back pressure, resulting
in dripping shortly after the rubber valve is closed A too small needle can also
affect the exhaust bubble action when the rubber valve is first used You can
adjust the pressure of the pressure bucket, not too high, and drive the glue. If the
dispensing valve can be fine tuned, try to adjust it as small as possible (to
reduce the quick response time of the dispensing valve), or replace the larger
needle to solve this problem The conical inclined needle produces the least back
pressure and the smoothest liquid flow The air inside the liquid will drip after
the rubber valve is closed. It is best to eliminate the air inside the liquid in
advance or use a rubber that is less likely to contain bubbles Or centrifuge the
glue to remove bubbles before use
Inconsistent dispensing size is mainly caused by the unstable pressure of the
pressure cylinder or air used to store the fluid The intake pressure regulator
should be set at a pressure 10 to 15 psi lower than the minimum pressure in the
factory. The pressure used by the pressure cylinder should be above the middle
pressure of the regulator, and the use of a pressure between the low pressure part
of the pressure gauge should be avoided The control pressure of the glue valve
should be at least 60psi to ensure stable glue dispensing Finally, the adhesive
should be checked
Time If it is less than 15/1000 seconds, it will cause unstable glue
dispensing The longer the adhesive time, the more stable the adhesive
will be
If the flow rate is too slow, the pipeline should be changed from 1/4 "to 3/8" If there is no
need, the pipeline should be as short as possible
If the fluid pressure is too high due to the presence of bubbles in the fluid and the valve opening
time is too short
It is possible for air to seep into the liquid The solution is to reduce
fluid pressure and use a conical angled needle
The main reason for the blockage of instant glue (quick drying glue) on the glue valve joint and
pipeline is that
Excessive moisture or instant glue that has been reused Ensure the use
of fresh instant glue Thoroughly clean the pipeline with acetone
containing no moisture The air used should be dry and a filter should be
installed between the air pressure and rubber valve system in the
factory If the above methods are still ineffective, nitrogen should be
used
