Liquid Discharge Apparatus Plunger Speed Control
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Solution Overview
Problem
Existing liquid material discharge apparatuses face challenges in adjusting the movement speed of a plunger while maintaining a constant stroke, leading to difficulties in adjusting the discharging amount and limitations in handling various types of liquid materials, especially high viscosity fluids.
Innovation Solution
A liquid material discharge apparatus that includes a liquid chamber, a plunger with a piston, an elastic body for biasing, and a pressurizing chamber with compressed gas, allowing for independent adjustment of the plunger's movement speed by varying air pressure, and incorporating mechanisms for stroke and biasing force adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the stroke of the valve head is lengthened to increase displacement amount for faster movement, then the movement speed improves, but the apparatus size increases and fast tact becomes difficult to maintain
Solution Approach 1:
The invention uses compressed air pressure to drive the valve head, replacing spring-based mechanical actuation. The air pressure can be independently adjusted to control valve head movement speed without changing the stroke length, thereby achieving speed adjustment without increasing apparatus size.
Solution Approach 2:
The invention introduces an adjustable air pressure system that allows dynamic control of the valve head movement characteristics. By varying the air pressure, the movement speed can be adjusted while maintaining a constant stroke, providing dynamic adaptability without structural changes.
2Speed
If the stroke of the valve head is shortened to decrease displacement amount for slower movement, then the movement speed decreases, but the apparatus size reduces
Solution Approach 1:
The compressed air pressure system allows independent control of valve head movement speed without being constrained by stroke length. This enables optimization of both speed and discharge amount according to production requirements, resolving the trade-off between these parameters.
3Ease of operation
If the movement speed of the plunger is adjusted by changing the stroke, then the discharging amount can be controlled, but the apparatus becomes more complex and less versatile
Solution Approach 1:
The air pressure control system provides a simple and versatile means to adjust plunger movement speed and discharge amount. A single pressure adjustment mechanism replaces complex mechanical stroke adjustment systems, reducing overall device complexity while improving ease of operation.
Solution Approach 2:
The invention changes the control parameter from mechanical stroke length to air pressure. This parameter change simplifies the adjustment mechanism while providing versatile control over discharge characteristics, making the system easier to operate and adapt to different requirements.
4Device complexity
If spring-based actuation is used to move the plunger, then the discharge mechanism is simple, but the movement speed cannot be adjusted independently from stroke
Solution Approach 1:
The air pressure actuation system maintains relative simplicity while adding the capability for independent speed control. The pressure-regulated air supply allows adjustment of plunger movement speed without modifying the mechanical structure or stroke, resolving the contradiction between simplicity and adjustability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise adjustment of the plunger's movement speed and discharging amount without altering the stroke, facilitating the discharge of both low and high viscosity liquids, including those unsuitable for inkjet-type discharging, with high accuracy and efficiency.
Implementation Method 1
an elastic body which applies a biasing force to the plunger; and a pressurizing chamber in which the piston is arranged and to which compressed gas is supplied
Implementation Method 2
a pressurizing chamber in which the piston is arranged and to which compressed gas is supplied. The liquid material is discharged through the discharging port by causing the plunger to move forward fast, the elastic body biases the plunger in a rearward movement direction, and the compressed gas supplied to the pressurizing chamber applies a driving force to the piston to cause the plunger to move forward
Data Source
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AI summary
In order to provide a liquid material discharge apparatus which can easily adjust a movement speed of a plunger and a method for the same, the liquid material discharge apparatus includes a liquid chamber (50) which communicates with a discharging port (11) and to which a liquid material is supplied; a plunger whose rear end portion has a piston (33) and whose front end portion moves forward and rearward inside the liquid chamber (50); an elastic body (47) which applies a biasing force to the plunger; and a pressurizing chamber (49) in which the piston (33) is arranged and to which compressed gas is supplied. The liquid material is discharged through the discharging port (11) by causing the plunger to move forward fast, the elastic body (47) biases the plunger in a rearward movement direction, and the compressed gas supplied to the pressurizing chamber (49) applies a driving force to the piston (33) to cause the plunger to move forward. The liquid material discharge method uses the liquid material discharge apparatus.