Liquid Supply Device Radial Drive Compact Axial Length
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Solution Overview
Problem
Conventional liquid supply devices with electric actuators and fluid pressure cylinders placed on the axis of the cylinder body result in increased axial size, limiting their installation near discharge guns and causing responsivity degradation due to pulsation in discharge speed.
Innovation Solution
A liquid supply device with a cylinder having closed ends, a piston that compartitions the inner space, a piston rod, a frame member, and a drive section that allows the cylinder to reciprocate, reducing the axial length and eliminating pulsation in discharge speed by placing the drive section laterally, enabling precise positioning and easy replacement of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electric actuator and fluid pressure cylinder are placed on the axis of the cylinder body, then the liquid supply device can be structurally simplified, but the axial size increases and installation near discharge gun becomes impossible
Solution Approach 1:
The drive section is repositioned from the axial direction to the radial direction of the cylinder body. The electric actuator and fluid pressure cylinder are arranged radially outward from the cylinder body's axis, transforming the layout from one-dimensional (axial) to two-dimensional (radial+axial), thereby reducing axial length while maintaining structural connectivity through the connecting plate.
2Length of moving object
If the axial size is reduced by repositioning the drive section, then installation near discharge gun becomes possible, but the device requires lateral placement of drive section
Solution Approach 1:
The drive section is relocated to the radial dimension, positioned laterally relative to the cylinder body. The connecting plate serves as a spatial bridge, allowing the electric actuator and fluid pressure cylinder to be mounted on the lateral surface of the cylinder body, thus achieving compact axial length while distributing components in the radial direction.
3Length of moving object
If conventional gear pump is used to reduce size, then the device becomes compact, but pulsation occurs in discharge speed
Solution Approach 1:
The conventional gear pump mechanism is replaced with a piston-cylinder system driven by electric actuator and fluid pressure cylinder. This substitution eliminates the inherent pulsation of gear pumps by using reciprocating piston movement controlled by programmable logic, achieving both compact size and stable discharge speed through electronic control rather than pure mechanical action.
4Ease of operation
If the liquid supply device is positioned away from discharge gun due to size constraints, then installation becomes easier, but pipe length increases and responsivity degrades
Solution Approach 1:
By repositioning the drive section radially and reducing axial length, the liquid supply device becomes compact enough for direct mounting near the discharge gun on the robot arm. This spatial reconfiguration eliminates long connecting pipes, enabling rapid liquid supply response while maintaining easy installation through standardized mounting interfaces on the robot's third joint.
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
The solution reduces the axial length of the liquid supply device, improves responsivity by eliminating pulsation, and allows for easier integration with discharge guns, enhancing its applicability and maintainability.
Implementation Method 1
a piston rod which extends to penetrate an end portion of the cylinder and has a tip end portion connected to the piston
Implementation Method 2
The drive section may include a motor, and a driving force transmission mechanism which converts a rotational force of the motor into a linear movement force
Data Source
AI summary
A liquid supply device which supplies liquid to a target object, comprises a cylinder having both ends closed; a piston which comparts an inner space of the cylinder into a first space and a second space, and is relatively slidable on an inner wall surface of the cylinder; a piston rod which extends to penetrate an end portion of the cylinder and has a tip end portion connected to the piston; a frame member to which a portion of the piston rod which is located outside the cylinder is fastened; a drive section which causes the cylinder to reciprocate in a direction in which the piston rod extends; a first flow line which is in communication with the first space to flow the liquid therethrough; and a second flow line which is in communication with the second space to flow the liquid therethrough.