Design and Experimental Verification of Pressurized Cylinders in Hydraulic Rubber Hose Pressure Washers

Hydraulic rubber hoses are subject to great hydraulic impact during the actual working process, which causes a great potential safety hazard. Therefore, it is necessary to carry out pressure tests on hose assemblies to ensure its quality, so providing a high pressure for the hydraulic hose has become the key technology of this problem. Aiming at solving the problem of detection of pressure resistance in hydraulic rubber hose cleaning machines, this paper analyzed the pressurization mechanism of the hydraulic pressurized cylinder and proposed a method of continuous pressurization. This paper also theoretically analyzed the pressure expansion of the rubber hose, and the conclusion is that for the maximum hose capacity (hose size is Φ25 mm × 6 m), the volume of water required to provide water in the hose from 10 MPa to 100 MPa is 0.59 L. The pressurized cylinder was designed and checked theoretically and analyzed by the finite element method. It is concluded that the maximum stress of the pressurized cylinder is concentrated at the bottom of the high-pressure chamber, and the outlet hole at the bottom of the cylinder barrel of the high-pressure chamber is the weakest part of the pressurized cylinder. The performance of the supercharging cylinder is verified by experiments, which proves the feasibility, rapidity and stability of the supercharging cylinder.

Fabrication and investigation of the mechanical properties of PVC/carbon fiber/graphene nanocomposite pipes for oil and gas applications

This article presents a novel plastic injection molding method for industrial manufacturing of polyvinyl chloride/carbon fiber/graphene (PVC/CF/Gr) nanocomposite pipes. In this method, the reprocessing cycles in the screw cylinder barrel and the fiber (embedded as the material) passes through the extruder lead to enhance Gr dispersion and orientation within the matrix. The mechanical properties of the manufactured nanocomposite pipes are evaluated through three standard tests, namely axial tension, axial compression, and transverse compression. From the experimental results, it is concluded that the second reprocessed PVC/CF/Gr composite demonstrates superior mechanical properties in comparison with the virgin composites. The results indicate an increase of 179% and 154% for Young’s modulus, along with an ultimate tensile strength at 2-wt% Gr with two reprocessing iterations in the cylinder barrel, respectively. Improvement in the mechanical properties of the PVC/CF/Gr composite produced by melt reprocessing could be due to strong interfacial interactions between the polymer matrix and the fibers.

Design and Development of Hydraulic Rescue Cylinder for Cutting and Spreading

The design and development of this hydraulic rescue cylinder are one of two parts that can attach with hydraulic rescue jaw to form a rescue tool which can easily cut and spreading metals. This study will improvise most of the existing hydraulic rescue cylinder that is heavy and difficult to use by developing a new hydraulic cylinder using mild steel with design calculations. In developing this hydraulic cylinder, the area of the cylinder barrel must be first considered. The concept idea of this project was based on a hydraulic double-acting operation that can extend and retract a piston rod. Selected material of this project was mild steel, and a study about its mechanical properties have been done. The hydraulic rescue cylinder also has been testing its operation in extending and retracting piston rod. The simulation analysis of this product also has been done by using Abaqus CAE for static analysis and Solidworks 2016 software for motion study and analysis of the product. Result achieved from this analysis are that is best in term of value of deformation, maximum elasticity and factor of safety of this project. Thus, the recorded result can use for further study and future recommendation

Modeling Study on Stiffness Characteristics of Hydraulic Cylinder under Multi-Factors

For a complex mechanical system driven by hydraulic cylinders, the dynamic response characteristics of the mechanical system are significantly affected by the stiffness characteristics of hydraulic cylinders. This paper comprehensively studies the impacts of various factors on the stiffness characteristics of the hydraulic cylinders, including the oil bulk modulus, the air content in the hydraulic oil, the axial deformation of the piston rod, the volume expansion of the cylinder barrel, the volume expansion of the metal pipes and the flexible hoses, and the deformation of the hydraulic cylinder sealing. By combining the theoretical analysis and the experimental results, the level of each impacting factor was quantified, and the stiffness model of the hydraulic cylinder was established. Finally, comparative analysis of the stiffness was conducted by taking the experimental hydraulic cylinder as an example; it was verified that the calculated results of the proposed hydraulic cylinder stiffness model approximated the experimental results. Compared with stiffness models presented in current literature, the average accuracy was improved by more than 15 %.

The Dynamics of Leakage in Bent Axis Units Without Timing Gear

Bent axis hydraulic pumps and motors are extremely popular due to their high efficiency and large speed range. A number of different concepts exist with respect to kinematic restraints on the cylinder barrel motion. Some manufacturers rely upon a timing gear for precise synchronization of the shaft and barrel speeds while other companies have successfully introduced bent axis units without such a mechanism. The paper analyses the dynamics of bent axis machines with tapered pistons driving the cylinder barrel. A rotation of the pistons inside the corresponding bores is proposed to result in changing cylinder chamber to case drain leakages. The reported phenomenon is shown to have a significant effect on the low frequency part of pressure and flow pulsations. In this way, frequency components far below the fundamental frequency associated with the shaft revolution are generated.

Autonomous External Glass Cleaning Robot

This paper deals with an autonomous external glass cleaning robot that can perform the operation by ensuring proper adhesion to the glass as well as movement along the entire window without colliding with the window pane or any other obstacle. The concept used in this work to actuate the robot is pneumatics wherein a pneumatic cylinder is coupled with a linear channel made up of stainless steel. It has a guide and a block which are connected through a chain and sprocket. The block can move along the guide. The piston of the cylinder is coupled with the block while the cylinder barrel is coupled with the guide. Adhesion of the robot to the glass is ensured using the vacuum technology. Four suction cups are used to make the robot adhered to the glass. Two channels are placed at right angle with each other, one for horizontal motion and one for vertical motion. Stepwise movement of the robot is achieved by individual control of suction cups. This is done using the software Arduino and Arduino UNO R3 microcontroller. Ultrasonic sensors are used to measure the dimension of the window pane as well as detect the obstacle/edge of the window. The cylinders and vacuum generators are actuated using solenoid DCV’s. As the robot moves, a rotating disk located at the bottom of the robot has a cleaning brush/sponge attached to it which cleans the glass as the robot and hence the entire glass surface is covered and cleaning operation is performed autonomously. The advantage of this robot is its simple design and its feasibility. The fact that we are able to successfully move the robot on a vertical glass frame without damaging it allows us to use it for several other applications too such as inspection.

Eddy Current and Metal Magnetic Memory Testing Nondestructive Evaluation for Superficial Defects of Old Cylinder Barrel

Eddy current testing and metal magnetic memory testing, cooperated with special testing devices, were applied to detect the superficial defects of old cylinder barrel. It was indicated that there were three types of the signals, which were non-defect signals, discontinuous peak signals and continuous peak signals. Non-defect signals indicated that there was no defect in cylinder barrel, and the discontinuous peak signals denoted that there was circumferential cracking, and the continuous peak signals showed that there was longitudinal cracking in the surface of cylinder barrel. The amplitude of eddy current testing signals characterizes the depth of cracking, and the gradient of magnetic signals descript the degree of stress concentration. The method mentioned above detects the cracking and stress concentration in the superficial coat of old cylinder barrel, which effectively guarantee the quality of automobile cylinder.

Piston Air Compressor Based on Symmetrical Double-Crank Link Mechanism

Machine vibration, noise and cylinder barrel wearing are produced when ordinary piston air compressor driven by crank link mechanism is working. Piston air compressor driven by double-crank link mechanism is proposed in this paper to eliminate these problems. Secondary pressurized double-acting air compressor and two-stage double-acting air compressor based on symmetrical double-crank link mechanism are designed in this paper to increase air compressors output pressure and flow rate and to achieve output control of low pressure high flow and high pressure low flow. It can remove effects generated by lateral force, reduce the vibration and noise and the wearing of cylinder barrel, and improve the steadiness and the service life of the air compressor.