Electric Actuator for Horizontal Plate Pressure Filter
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Solution Overview
Problem
Horizontal plate pressure filters face issues with hydraulic actuators, which are prone to contamination and malfunction, and have limited speed due to seal limitations, hindering cycle time efficiency.
Innovation Solution
The implementation of an electric motor-based opening actuator arrangement with a mechanical opening mechanism to move filter plates, eliminating hydraulic system drawbacks and enhancing movement speed and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic actuators are used for moving filter plates, then good force-weight ratio and position control are achieved, but the system is prone to contamination, malfunction, and limited speed due to seal constraints
Solution Approach 1:
The patent replaces the hydraulic actuator system with an electric motor-driven mechanical transmission system. The electric motor connects through a transmission mechanism (such as gears, belts, or direct drive) to the filter plate actuators, eliminating hydraulic oil and seals entirely. This substitution removes the source of contamination and malfunction while maintaining the necessary force and position control through electrical actuation and control systems.
2Measurement precision
If hydraulic actuators with seals are used, then position control is achieved, but the sealing speed is limited hindering cycle time
Solution Approach 1:
The patent eliminates hydraulic seals by using electric motors with direct or mechanical coupling to the filter plate actuators. Electric motors can achieve much higher rotational speeds and accelerations without seal limitations, allowing the filter plates to move faster during opening and closing operations. The position control function is maintained through electronic control systems that precisely regulate motor position and speed, replacing the hydraulic control mechanism.
Solution Approach 2:
The patent employs dynamic control of the electric motors to optimize the movement profile of filter plates. The system can vary speed and acceleration dynamically during the opening and closing cycles, achieving high speeds when position precision is less critical while maintaining precise positioning when needed. This dynamic approach overcomes the speed limitations of hydraulic seals while preserving position control capabilities.
3Force
If separate actuators are used for pressing and opening/closing operations, then the required sealing pressure and force are achieved, but the device complexity increases
Solution Approach 1:
The patent employs electric motors that can deliver high torque for sealing operations and are controlled by a unified control system that coordinates both pressing and opening/closing functions. The electric motor system, combined with appropriate mechanical linkages and control logic, replaces the need for separate hydraulic systems, reducing overall complexity while maintaining the necessary force for sealing and the coordination for cyclic operations.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A horizontal plate pressure filter (1), comprising a plurality of superimposed filter plates (2) for forming a filter chamber between at least two adjacent filter plates. An opening actuator arrangement (5) provides an opening movement and a closing movement, and an opening mechanism (6) configured to mechanically transmit the opening movement and the closing movement. Particularly, the opening actuator arrangement (5) comprises an electric motor (5a). The horizontal plate pressure filter further comprises a tail plate (8) arranged below the lowermost filter plate (2), and a press actuator arrangement (9) for pressing the tail plate (8) towards the filter plates (2) so as to compress the filter plates (2) between the head plate (3) and tail plate (8) in order to seal said filter chambers.