Slurry Pump Cleaning Mode for Short-Stroke Cylinder Purging
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Solution Overview
Problem
Existing high-viscosity pumps, such as concrete pumps, face challenges in efficiently cleaning the conveying cylinders and pipe diverter to prevent material hardening, which is not adequately addressed by current operational methods.
Innovation Solution
A cleaning operating mode is introduced where the conveying cylinders assume a hopper-side end position, and a reverse pumping process is implemented to shorten the stroke, followed by a controlled activation of the pipe diverter to facilitate efficient cleaning of the end-face openings and cylinder interiors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conveying cylinders are cleaned in the conventional manner with full stroke movement, then thorough cleaning of the entire cylinder length is achieved, but the cleaning time and resources are excessively consumed
Solution Approach 1:
The conveying cylinders are moved to a predetermined hopper-side end position before cleaning begins. This preliminary positioning action confines the cleaning operation to a limited space near the hopper, eliminating the need to clean the entire cylinder length and significantly reducing cleaning time while maintaining effectiveness where material hardening is most likely to occur
Solution Approach 2:
The cleaning operation is concentrated on the local region near the hopper-side end position of the conveying cylinders, where material accumulation and hardening are most critical. By using the pipe diverter to alternately open and close the end-face openings in this localized area, thorough cleaning is achieved where needed without wasting resources on the entire cylinder length
2Reliability
If the pipe diverter is activated during cleaning to alternate between conveying cylinders, then cleaning of the pipe diverter and end-face openings is improved, but the cleaning process becomes more complex
Solution Approach 1:
The pipe diverter utilizes its own operational mechanism (alternately opening and closing end-face openings) to facilitate its own cleaning process. By activating the pipe diverter during the cleaning mode, the system uses the existing diverter motion to alternately expose both end-face openings to the cleaning medium, achieving thorough cleaning of the pipe diverter and openings without requiring additional external cleaning mechanisms or complex procedures
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
This approach significantly reduces the space requiring cleaning, saving time and resources while ensuring thorough cleaning of the conveying pistons and pipe diverter, thereby preventing material hardening.
Implementation Method 1
the drive cylinders are alternately pressurized with hydraulic oil at one end and hydraulically coupled to each other at the other end via a connecting line using so-called rocker oil
Implementation Method 2
By draining (in the case of bottom-side drive of the drive cylinders) or supplying (in the case of rod-side drive of the drive cylinders) oscillating oil, the stroke of the conveying cylinders is shortened
Data Source
Figure 1~2
Figure 3~6
Figure 7~10
AI summary
The invention relates to a high-density solids pump (10) with two conveying cylinders (16, 18), the conveying pistons (34, 36) of which are each rigidly connected to a drive piston (38, 40) of an associated drive cylinder (26, 28) via a common piston rod (30, 32), wherein a conveying operating mode is provided in which the conveying cylinders (16, 18) are driven in push-pull operation, in order to convey high-density solids (58) via a diverter valve (24) alternately connected to the conveying cylinders (16, 18) from a hopper (14) into a conveying pipe (56) (50), and a cleaning operating mode is provided in which the conveying cylinders (16, 18) jointly adopt an end position on the hopper side and the diverter valve (24) is alternately switched between the two conveying cylinders (16, 18).