Papers by Keyword: Hydraulic Cylinder

Abstract: In this study, the hydraulic cylinder with internal non-slip safety locking device was designed and analyzed. From the market demand and fail-safety requirement, the hydraulic cylinder prototype specifications are developed. The dimensions and mechanisms of hydraulic cylinder model were initially designed to make sure parts combination as requirement. The stress and deformation of designed model with material properties were analyzed by Solidwork COSMOS module. The finite element analysis results showed that the clamp clip cutting seams help to uniform rod and clamp clip stress distribution. The bottom end and front end of the clamp clip with 16 cuttings have the best results in terms of stress and deformation. But the bottom end and front end of the clamp clip with 8 cuttings for rod holding effect would be better for reducing machining costs and increase durability. The stress concentration phenomenon of cut clip end can be rounded treatment; in order to reduce stress is too large in clip end.

Abstract: The research work on the influence of an angle α at centre and the finite element sizes in modeling a hydraulic leg cylinder has been done to determine the stress-strain state by FEM using SolidWorks Simulation software. Based on the analysis results the reasonable values of the central angle and finite elements for the cylinder and weld have been defined in terms of the smallest error and maximum performance computation.

Abstract: A method is presented for determining the pouring point location of concrete pump truck. The method does not change the structure of the concrete pump truck, only need to replace the hydraulic cylinders of booms with the hydraulic cylinders with displacement senor, and the displacement sensors are mounted in the inside of the hydraulic cylinders and do not need any extra protection. The relationship formulas between the contraction and expansion amounts of the hydraulic cylinders and the pouring point location are derived and programmed to input into a data processing unit. The contraction and expansion amounts of the hydraulic cylinders are timely acquired and inputted into the data processing unit, then the pouring point location can be displayed in real-time on the screen of radio controller, and the workers can quickly and accurately locate the pouring point of the concrete pump truck to poured point.

Abstract: Construction machinery hydraulic cylinder is usually discarded after service cycle. The residual value of discarded products can be recycled greatly by remanufacturing. Disassembly and assembly is the key process in hydraulic cylinder remanufacturing. The construction machinery hydraulic cylinder disassembly and assembly equipment is developed. Hydraulic power is adopted in this equipment. The clamping, positioning of cylinder tube is realized by hydraulic clamping mechanism automatically. The piston component pulling out or into cylinder tube is realized by hydraulic working mechanism automatically. This equipment has been applied successfully in the project of "key technology and equipment for construction machinery parts remanufacturing" in a research institute. The results indicate that the application of this equipment will not only increase the automaticity and efficiency remarkably, but also reduce the damage to hydraulic cylinder key part greatly.

Abstract: The reliability of the hydraulic cylinder influences the safe working of the mechanical equipment. So, there are very high technical requirements and machining precision for the hydraulic cylinder. The manufacture deviation of the bore diameter will appear in the machining process. It will influence the working performance of the hydraulic cylinder. The paper determines the influence factors of the hydraulic cylinder machining quality and the different factor level, conducts the orthogonal tests of the boring quality of the hydraulic cylinder. According to the range analysis of all test data, the following conclusions can be drawn. The best match of all kinds of factors is A3B2C2D3. The influence of cutting speed on boring the quality of the hydraulic cylinder is the largest. The influences of cutting tool type, the number of boring tool used in boring, and the feed quantity on the quality of boring are minimum.

Abstract: This article mainly on monorail crane motion characteristics of three different kinds of drive systems and pressure analysis of I-steel. The motion characteristics figure of hydraulic step cylinder drive system, friction wheel drive system, rack-and-pinion drive system are done by Solidworks Motion module. The I-steel pressure analysis of different drive systems is done by the Ansys Workbench module. By analyzing and comparing the figures, the rack-and-pinion drive system has a superior property in both motion characteristics and pressure of I-steel.

Abstract: The thin wall steel U-pipe is the main component of a heat exchanger. It is extremely applied in various machines such as heat exchanger, air conditioner and refrigerator. However, the handicraft operation method is generally adopted in our country currently with its big labor strength and low efficiency in the actual production process. In order to resolve this practical problem, we design the automatic control pipe bender which can process various radius of the thin wall steel pipe.

Abstract: Heat exchanger tube bundle drawing and assembling machine is special equipment for maintenance of heat exchanger of petroleum, chemical and other enterprises, specifically for removal and installation of the heat exchanger tube bundle. This paper introduces a self-developed heat exchanger tube bundle drawing and assembling machine’s overall structure, driving principle, hydraulic system and the design of hydraulic cylinder, which has ensured the safety and reliability of a Special machine for Heat exchanger tube bundle drawing and assembling.

Abstract: By comparison, this paper determines inner bore processing technic program of the engineering machinery hydraulic cylinder block and makes some analysis of the rolling processing technic and relevant emerging issues to propose reasonable and feasible process route and process parameters and ensure the quality of the cylinder processing. It also shows the design of boring-rolling compound tools with high efficiency and high precision for given cylinders.

Abstract: In the optimisation stage of the systems one of the more important step is the optimisation of the dynamic behavior of all elements of the system, with priority the elements what have the slow frequency, like motors. The paper try to show how will be possible to optimise very easily the dynamic behavior of elements and systems, using LabVIEW propre instrumentation, the transfer functions theory and the Extenics Theory to solve the contradictory problems. By appling the virtual LabVIEW instrumentation will be possible to choose on-line the optimal values for each constructive and functional parameters of the elements and the systems to obtain one good dynamic answer: maximal acceleration without vibration, minimum answer time and maximal precision. In the paper was defined the optimal area of the precision-stability by imposed the breaking frequency from the Bode characteristics to optain the desired acceleration time. The paper shown the desired constraints and by using the Extenics theory was possible to choose the optimal solution of the precision-stability contradictory problem. In the research were used some different virtual LabVIEW instruments, to simulate the dynamic behavior of the cylinder when the active area, flow loss gradient, force gradient were changed in his desired physical field. By using the assisted research and the Extenics theory was possible to find the optimal values for the dynamic parameters and to be sure that working point will be inside of the desirable field of the hydraulic cylinder precision-stability.