Concrete Pump Manipulator Hydraulic Circuit for Lower Fluid Volume
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Solution Overview
Problem
Large manipulators for concrete pumps require significant amounts of hydraulic fluid for mast arm adjustment, leading to increased weight and complexity, as well as the need for powerful hydraulic pumps and large fluid tanks.
Innovation Solution
A hydraulic circuit arrangement that optimizes fluid flow by using a bypass valve to connect and separate fluid channels based on operating conditions, reducing the amount of hydraulic fluid needed and allowing for lighter, less powerful pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large quantities of hydraulic fluid are used for mast arm adjustment, then the manipulator can operate with full functionality, but the weight and complexity of the manipulator increases
Solution Approach 1:
The patent merges the rod-side working volume and piston-side working volume into a single hydraulic circuit by connecting them through a fluid channel. This allows the hydraulic fluid to be reused between the two volumes, reducing the total quantity of hydraulic fluid required while maintaining full manipulator functionality.
Solution Approach 2:
The hydraulic fluid in the circuit serves multiple functions simultaneously: it acts as the working medium for both the rod-side and piston-side volumes, and the same fluid can be supplied to both volumes through the common fluid channel. This multi-functionality reduces the overall fluid requirement while preserving operational capabilities.
2Adaptability or versatility
If large quantities of hydraulic fluid are used for mast arm adjustment, then the manipulator can operate with full functionality, but the complexity of the hydraulic system increases
Solution Approach 1:
The patent combines the hydraulic circuits for the rod-side and piston-side volumes into a single integrated system. By merging these circuits and using a common fluid channel, the number of separate hydraulic components is reduced, thereby decreasing system complexity while maintaining full functionality.
3Productivity
If powerful hydraulic pumps and large hydraulic fluid tanks are used, then rapid mast arm adjustment is achieved, but the weight of the manipulator increases
Solution Approach 1:
The patent merges the rod-side and piston-side hydraulic volumes into a single circuit, allowing hydraulic fluid to be transferred between them. This enables the use of smaller pumps with lower power requirements, as the same fluid can serve both volumes sequentially, thereby reducing pump and tank weight while maintaining rapid adjustment capability.
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 solution reduces the weight and complexity of the manipulator by minimizing the amount of hydraulic fluid required, enabling efficient operation with smaller, lighter hydraulic pumps while maintaining functionality.
Implementation Method 1
the hydraulic cylinder has a piston-side working volume and a rod-side working volume that can be pressurized with hydraulic fluid
Data Source
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AI summary
The invention relates to a large manipulator for concrete pumps having a boom pedestal which is arranged on a chassis and can be rotated about a vertical axis of rotation, having an articulated boom which is composed of at least two boom arms and which carries a concrete delivery line, and having at least one hydraulic drive unit for pivoting at least one of the boom arms about a horizontal axis of rotation, which unit comprises a hydraulic cylinder (154) and a piston (156) which is arranged so as to be movable in the hydraulic cylinder (154) and which has a piston rod (158) connected to said piston. Here, a piston-side work volume (160) which can be charged with hydraulic liquid and a rod-side work volume (162) which can be charged with hydraulic liquid are formed in the hydraulic cylinder (154). According to the invention, the large manipulator contains a hydraulic circuit arrangement (164) for driving the at least one hydraulic drive unit, which circuit arrangement, in a first switching state, connects a first work connection (168) to the rod-side work volume (162) for feeding or removing the hydraulic liquid through a first fluid duct (170) and connects a second work connection (172) to the piston-side work volume (160) for feeding or removing the hydraulic liquid through a second fluid duct (174), and which circuit arrangement, in a second switching state different from the first switching state, separates the first work connection (168) from the first fluid duct (170) and in so doing connects the first fluid duct (170) to the second fluid duct (174) for feeding hydraulic liquid from the rod-side work volume (162) into piston-side work volumes (160).