Design and manufacture of hydraulic system using brake fluid as medium

2 Abstract The design and manufacture of the hydraulic system and device with the brake wave as the working medium for the design and application of the brake wave and the function of the hydraulic system provide a reference for the system design of this special type. The experience hydraulic drive and control system shirts are designed with the oil-filled liquid oil as the medium for the production of the liquids. However, the use of special liquids as the medium device imposes strict requirements on the functional design and manufacture of the hydraulic system, and it is impossible for the manufacturer to provide special hydraulic components for each special medium. This requires the designer to implement innovative design and continuously summarize and improve in use.

Specific features are required to be designed.

1 brake fluid brake fluid is the non-mineral oil working medium used in automotive hydraulic brake system. At present, the brake fluid of the automobile is mostly made of ethanol, ether, ethanol, methyl ether, polyether, etc. as the main raw material and the additive brake fluid is 4.28; 7.0.5, the value of the hydraulic oil of the petroleum-based hydraulic oil-in-water-in-oil water-in-water ethanol phosphate ester is high.

Therefore, the liquid is more corrosive to steel cast iron brass copper tinplate than hydraulic oil. The compatibility with rubber has strict requirements. The brake fluid is used as the working medium, which undoubtedly puts special requirements on the design of the system and the hydraulic components. 2 Requirements for the hydraulic system In the hydraulic brake system of the automobile, the brake is adjusted. The device, also known as the device, is designed to ensure reliable braking and safety. The valve must be rigorously tested and shipped to the factory. The wood hydraulic system is designed to achieve the performance test of the valve. The hydraulic system requires the medium brake fluid.

The system working pressure 14 flow rate is not less than 31 measured component double-cavity proportional valve.

Function requirement 1 Measure the flow and flow difference between the two chambers, the detection and display of the pressure values ​​of the two chambers, and the data acquisition and processing. When the pressure is reduced, the inlet pressure of the two chambers is 38 liters to 13.7; 1; the inlet of the two chambers during the sudden pressurization The pressure is 0.38 liters to 13.7 rivers; 5 has the function of holding pressure and pressure relief, meeting the requirements of automatic clamping and sealing.

3 system design and component selection For the characteristics of the special medium of brake fluid and the requirements of the system, the structural performance and technical parameters of various components should be carefully analyzed, the hydraulic components should be selected reasonably, and the hydraulic system should be drafted according to the system function. And control research and teaching work.

It can be seen from the analysis of 1 that there is a memory function. After the two control 1 and the successful trial production of the valve, after the factory test and Xingtai Mineral Bureau Xing Tong an actuator top coal control cylinder linkage 2, the actual test of the underground mine, the effect is good, can complete the specified functions, receive the current and support Coordinated action. Complete the spray dust reduction work. The praise of the household is to meet the design requirements.

1 hydraulic pump condition force higher flow small medium viscosity low enough to the significant features of the system, so the hydraulic pump first meets the requirements of the index, and requires the pump to seal good volumetric efficiency, 5 material corrosion resistance, from a variety of hydraulic pumps 1 Hydraulic system structure considerations, gear pump vane pumps are difficult to adapt to low viscosity media.

In view of the pump flow and the sensitivity requirements of the medium dyeing, an axial piston pump with a valve type distribution is preferred. The plunger and swash plate of the pump are used, 15, the hardness is above 60; the steel body of the pump body has good corrosion resistance, good valve-type flow sealing, high pressure, high volumetric efficiency and small volume.

The hydraulic pump is installed vertically in the fuel tank, and the suction and discharge ports are provided with Filters to protect the pump and other components of the system. The direct acting relief valve 1 is used as a safety valve, and the position through solenoid valve 6 is used as a pump unloading.

The commutating component reversing component should ensure reliable reversing of the system, and more importantly, it has the function of holding pressure. Therefore, the sealing of the component is required to be good, and the operation is simple and convenient. In systems with high pressure, low flow and low viscosity and high pressure holding requirements, the spool type structure reversing valve is not suitable. This system uses a ball valve type electromagnetic reversing valve, but the error of the commutation switching moment and the action time will also cause leakage. Based on this consideration, the electromagnetic ball is widely used on the liquid inlet path of the device to be tested, and the check valve is applied to the valve. It not only meets the system reversing requirements, but also ensures the pressure holding performance. The system pressure of the system is adjusted between 014 and the pressure is required to rise. The ratio is 0.33. The system uses the electro-hydraulic proportional control valve to adjust the pressure. After comparing the technical indicators of the electro-hydraulic proportional valve products at home and abroad, it was decided to use the direct-acting proportional relief valve with position feedback from Germany Rexroth, and the matching electronic controller's regulating ramp rise time was adjusted between 0.0558. Meet the system control requirements, the components in 1

The detecting component must be easy to install and adjust for observation, which is beneficial to the computer to collect and process data. A series of elliptical gear flowmeters with counters and transmitters are installed at the end of the outlet of the tested device to realize the two-cavity flow test and the flow test. 81.82 in the cabinet 1, the input and the output of the wave measuring device are accurately installed. 1. The dynamic film has good dynamic characteristics and the small drifting film pressure transmitter realizes the two-cavity input and output pressure of the measured component, the holding pressure and The pressure drop is detected, and the data acquisition of the sub-meter is used to realize the assembly of the 4 systems in the 1st. Commissioning and other for convenient operation, shortening the pipeline, and facilitating adjustment and maintenance. The system components are integrated according to functions; the valve 1 valve 6 is installed with a sub-assembly block. The integrated block is placed on the fuel tank to achieve the main chest safety and unloading functions. The direct-acting proportional relief valve 2 and the position-passing electromagnetic ball valve 3132 pressure transmitter 13 are assembled in a block; the position-passing electromagnetic ball valve 333 is a pressure transmitter 24 in the block. These two integrated blocks are fixed to the operating gantry. Each integrated block is treated with anti-corrosion treatment. The inner passage pipe and pipe joint are cleaned with high-pressure liquid; the operation stand and countertop are covered with stainless steel plate; the whole fuel tank is treated with anti-corrosion treatment, and no paint or paint is used.

During the system commissioning phase, it was found that the output flow of the chamber 2 was not equal, that is, the flow of the human road was greater than 8 channels, because the pipe joint was straight. The right Angle and the copper pipe rubber hose of the pipeline cause the difference of the liquid resistance of the 2 channels, so that the flow rate is not required. The throttle element and the regulating fluid must be added in the 4th channel, but the throttle valve of the city cannot meet the requirements, and the pressure switch is used to convert the section into a section. The flow valve, the small 4 in the 1st, the secondary flow is balanced.

Since the internal passage of the test piece is not reliably cleaned during processing and assembly, after the high pressure liquid is flushed during the test, the iron inside the passage of the test piece is often jammed out of the position of the ball valve seat of the liquid passage 1. Seriously affecting the pressure holding performance, the 2 valves must also be frequently disassembled and cleaned, and even damaged parts inside the valve. The 2 valve must be reinforced and equipped with a high pressure filter, but the mountain field does not have this small flow product. The design and manufacture of the pipeline high-pressure filter, the principle of the 5152 hydraulic transformer in 1 and its application in the secondary regulation system Dong Honglin, Jiang Jihai. Wu Shenglin Institute of Fluid Power Transmission and Control, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China, and its application in sub-regulation systems.

There are basically two forms of hydraulic systems in engineering applications, namely flow coupling systems and pressure coupling systems. In a flow coupling system, the output flow of the hydraulic pump is constant and the pressure varies with the load.

When the load changes. The flow of the system is basically kept + changed. The working pressure of the system varies with the load, that is, the external load determines the working pressure of the system. The working condition of the flow coupling system is that the working pressure of the system can quickly respond to the load change. Within the allowable range, the system pressure can quickly reach the pressure required to overcome the load. In this system, there is no energy storage component and The hydraulic actuator motor is connected, and the speed of the hydraulic actuator motor is determined by the output flow of the hydraulic pump. Changing the direction of the hydraulic motor input pressure oil can change the direction of rotation of the hydraulic motor. Flow-coupled systems are only suitable for single-load or multi-loads of identical nature. For multiple unrelated loads, the efficiency of flow coupling is low or even impossible.

Coupling A hydraulic accumulator is installed between the hydraulic pump and the hydraulic motor of the flow-test coupling system, and the hydraulic actuator is a fully reversible hydraulic motor pump sub-component. At this time, the system is a pressure coupling system. This is the secondary adjustment hydrostatic transmission system in the sub-regulated hydrostatic transmission system.

Input and output of multiple hydraulic actuators. They can be connected separately to the constant pressure oil source in order to improve the transmission efficiency of this constant pressure system. The liquid helium parts at the load end must be cargoed. This system can be applied to Ding multi-load, which has high transmission efficiency; 1 can be good, and can, receive 2 flow, and connect with pressure coupling. The main difference between the two types of hydrostatic transmission systems is the difference between the flow coupling and the pressure coupling. Mainly engaged in scientific research and teaching work in hydraulic technology, 1 Jiang Zhenhai. Analysis of technical performance and market trends of automotive brake fluids in China.

Chemical Engineer, 19972.

21083089, technical conditions for the use of automotive brake fluid 舄.

3 Song Xueyi. Pocket Hydraulic and Pneumatic Manual Elbow Beijing Machinery Industry Publishing

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