Electro-hydraulic proportional control system for lifting speed of explosion-proof hydraulic hoist

The low-speed high-torque hydraulic motor commonly used in China is driven by a proportional amplification factor, 7. It is a differential regulator coefficient, especially 13 is an explosion-proof hydraulic hoist. The coefficient is controlled by a thousand decompression proportional valve. The factory is the integration time. The constant, the ruler is the amplification factor of the proportional amplifier, and there is a problem that the control system has a large dead zone, the operation is insensitive, and the system is a proportional electromagnet coil resistor, which is a proportional amplifier internal resistance and a low level of automation. As is known to all, compared with the servo system, the electro-hydraulic proportional control system has the advantages of low cost, energy saving, convenient maintenance, high power control and constant control precision. Now, a wide range of electro-hydraulic ratios for the explosion speed of the explosion-proof hydraulic hoist have been obtained. Control System Mao Zhengyu Hu Yanping Xiang, Department of Mechanical Engineering and Automation, College of Engineering, Hunan. The electro-hydraulic proportional technology is used to control the lifting speed of the explosion-proof hydraulic hoist, which can improve its control precision and automation control level.

+, hunger is the armature, the natural frequency of the component spring mass system. 1 Working principle The explosion-proof hydraulic hoist driven by the dry low-speed high-torque hydraulic motor mainly changes the inclination of the main oil pump to swing the other cylinder by controlling the displacement of the variable cylinder. The flow rate of the oil pump changes the speed of the hydraulic motor 1 to start the hoist and accelerate the operation. Therefore, the following electro-hydraulic proportional control scheme can be used. See 1.1 for the input, the displacement of the main pump variable cylinder, and the fork is the proportional directional spool. The displacement.

The speed-up electro-hydraulic proportional control system consists of a control hydraulic pump proportional 1 directional valve main pump variable cylinder displacement sensor and a proportional control amplifier controller proportional amplifier. By adjusting the energizing current of the proportional electromagnet, the oil entering the main pump variable cylinder can be controlled. Flow direction and size to control the speed and displacement of the variable cylinder. Since the lift 1 speed is proportional to the displacement of the most cylinder, the displacement of the variable cylinder can be controlled to control the lift speed. The displacement of the most oil cylinder is detected by the displacement sensor, and the voltage outputted by the displacement sensor is compared with a given voltage, and the voltage difference is sent to the proportional electromagnet coil when the voltage difference is obtained. When the value is zero, the proportional directional valve is closed, and the most cylinder is not moved and the speed is increased. The degree is also unchanged. By changing the magnitude of a given current, you can control the speed by 1 degree. The system uses a closed-loop control loop, which is a small closed loop in the proportional valve, that is, spool position feedback. The other is variable oil, large closed-loop feedback of cylinder displacement.

Through the operation, the transfer function of the electro-hydraulic proportional control system can be obtained.

The meaning of each symbol in 2 is as follows: the input voltage signal, the ruler + can go + bitter is the dimensionless damping ratio of the armature assembly, the claw is the mass of the armature assembly, the damping coefficient of the electro-hydraulic proportional valve, the ruler; the displacement of the armature assembly The force gain is the spring stiffness of the armature assembly, the current force gain is the feedback coefficient of the proportional valve spool movement speed, the ruler is the proportional valve spool displacement feedback coefficient, the ruler is the cylinder piston displacement feedback coefficient, and the 7 is the flow gain. For the flow coefficient, it is considered.

It is the wet end of the load pressure valve port, which is the oil source pressure, and the liquid density is called the hydraulic natural frequency as the hydraulic dimensionless damping coefficient.

The modulus of elasticity is the total mass of the cylinder, the effective area of ​​the piston, the viscous damping coefficient, =+0.5. is the total leakage coefficient, the internal leakage coefficient is the external leakage coefficient, and the stop flow gain. 2 simulation hydraulic system using simulation and simulation combined research method, simulation hydraulic system 3. Simulated cylinder 8 generation variable pump variable cylinder, the load is loaded by the cylinder 9 generation, the simulation system controls the lifting speed of the simulated cylinder lift.

The working principle of the proportional control hydraulic system is that the oil enters the variable pump from the fuel tank. When the electromagnet of the electro-hydraulic proportional reversing valve 6 is energized, the main valve moves to the right, and the oil enters the analog cylinder and the rod moves to the right with the change of 1. Set pump 2 relief valve 3. Flow meter 4. Pressure switch 5. Pressure 6. Electro-hydraulic proportional reversing valve 7. Check valve 8. Simulated cylinder 9. Load cylinder 1 displacement sensor. The electromagnetic reversing valve is dynamically loaded with the oil cylinder 9, and the right crucible oil return tank of the double-acting single-piston rod cylinder 8 of the simulated cylinder is simulated. When the electromagnet of the electro-hydraulic proportional directional control valve 6 is energized, the main valve moves to the left, pulls the loading cylinder 9, and the oil enters the mold in the past few decades of Mingshan Machine City 2001.02, and the analog speed control system is in the mine hoist The original equipment of the imported set is comparable to the effect. This article focuses on the wide application of Ximen, which has played an important role. The latest product of the mold 6-foot 70 full digital governor is used in the transformation of the mine hoist 670 full digital governor in the hoist speed control system. The introduction of the digital governor, the proposed speed control system is completed by many functions. The control unit is composed of analog control systems for all-digital technical transformation.

If you want to use more than ten, you will need ninety.

The control unit is composed of many discrete electronic components and integrated circuits. It has been proved that the simulation system has the following disadvantages: hardware complexity and poor reliability; 2 poor stability, sensitive to changes in environmental temperature and humidity; 3 long installation and commissioning period, maintenance The work is the largest; 4 dynamic performance is poor, 4 production efficiency is low; 5 spare parts costs, according to some users, 3 annual spare parts cost is tens of thousands to hundreds of thousands of yuan; 6 is determined by the characteristics of the analog speed control system, requirements Field maintenance personnel should have a relatively professional basic theoretical level.

The S hoist is the mine's throat equipment. With the safety and production efficiency of Zheng Xiaoping, CITIC Heavy Machinery Automation Engineering Co., Ltd., Luoyang, Henan 471039, and the emergence of the number of Yuhua speed control systems, the simulation system has been eliminated. In terms of economic benefits and social benefits, more and more users believe that the use of all-digital speed control systems or full digital transformation of analog systems will achieve twice the result with half the effort.

1 There are many digital speed control products available on the market, such as the 6-inch company's 0-system, the Siemens company's 340-foot 06-foot-24 series i.; and the SIMADYND series and the British Continental's 590 series. These products are characterized by 0 microprocessor as the core of the speed control device, the hardware is simple and easy to open; 2 user application software appears in the form of language or menu selection, easy to understand, although it is a new technology. The product, the user does not need to master the deep knowledge of the microcomputer; 3 hardware configuration capabilities are getting stronger and stronger, users in the same kind of hardware, through the software configuration of the hardware can complete different functions. All of these digital products have achieved satisfactory results in the application of mine hoists, but the difference is that the difference in the speed control system will lead to a lot of new product prices. Our company's former Luoyang Mining Machinery Factory Luoyang Mining Machinery Research Institute is a professional enterprise engaged in the research and development of mine lighting electrical control system. It has been committed to the research of all-digital DC electronic control system for many years. According to China's national conditions, it has been proved that the use of imported The all-digital speed control device, which is equipped with domestic famous brand power unit and other domestically-made auxiliary equipment, can reach the full-scale 埒 钭膣 想 想 想 想 鹅 鹅 鹅 豳塍 豳塍 豳塍 豳塍 豳塍 豳塍 豳塍 衮杵趑栉 衮杵趑栉 衮杵趑栉 衮杵趑栉 衮杵趑栉 衮杵趑栉 衮杵趑栉Arm, fuel tank. The relief valve 2 controls the outlet pressure of the variable pump, and the 6-foot 24 digital device of the analog cylinder is more compact and simple. The main components are the core hardware of the all-digital speed control device and the built-in microprocessor. Mainly completed, open loop and pulse triggering of armature circuit magnetic field loop, control, speed reference; speed feedback, device operation enable, touch control, configurable input and output control terminal circuit switch analog circuit and circuit switch Volume output, ruler 5485 serial interface. 5 The interface circuit mainly completes the conversion and isolation of strong electricity to weak electricity, and has the following functions: speed feedback speed measuring machine, power supply of electronic template; installation of 3 self-diagnosis heavy fault signal output, armature and magnetic field current detection, Measurement, armature and magnetic field power supply detection are also used as trigger pulses.

Trigger pulse.

The panel has a 5-digit, 7-segment digital display that can be displayed internally. ; number interface and fault conditions, etc., 3 1 Guard 0 display device state pressure is controlled by two relief valves and two check valves.

3 System Analysis and Conclusions 1. The hoist moves according to the requirements of the running speed according to the running conditions. The electro-hydraulic proportional speed control system adopts two sets of signal input modes, and the set is a stepless control of the manual potentiometer, and the other set is designed for programming control. The simulation experiment position input is equivalent to the driver's handle operation, the control precision and the driver's proficiency are ready to run and fault; 3 operation keys are sweat, 1 is used for parameter setting modification and operation, and is displayed through the digital tube.

Modifiable parameters.

Control, to achieve the purpose of automatic control The system uses a closed-loop control loop to ensure improved speed control accuracy.

The control system greatly simplifies the mechanical and hydraulic system, making the hydraulic system more convenient.

1 Liang Hongbin and so on. The application of electro-hydraulic proportional control technology in the welding machine of the welding machine. Machine tools and hydraulics, 20001.

2 Ren Wei. The application of electro-hydraulic proportional control technology in the brake system of oil drilling rigs. Hydraulic and gas 3 Hu Yanping. Improvement of the lifting speed control method of the hydraulic explosion-proof hoist. Mining machinery, 19985; 4 Mo Kui, claw 2.51.283 type mine explosion-proof hydraulic hoist. Coal Science and Technology, 199355 Lu Nanxiang, Hu Dahong. Electro-hydraulic proportional control technology. Beijing Machinery Industry Press, 1988. mouth, cleverly did not shoulder shoulders, sneak sneakers, 矜 introduced a new type of full hydraulic pilot control excavation loading machinery. A brief description of the machine provides a design idea. Descriptive excavation loading rock pilot control hydraulic system explosion-proof hydraulic hoist lifting speed electro-hydraulic proportional control system Mao Zhengyu et al. 3637 introduced the working principle of electro-hydraulic proportional control system for hydraulic explosion-proof hoist speed control, and gave the system principle box and transmission The function box, and analyzed the working process of its simulated hydraulic system, laid the foundation for the progressive study of its characteristics. It is clear that the system has the advantages of high control precision and easy automatic control. Descriptive hydraulic explosion-proof lifting electromechanical liquid proportional automatic control introduced the hardware and software of 6-foot-6 70-digital digital governor, and through the example, the 6-foot 70 full-digital governor is applied to the mine hoist governor system. Technical transformation can achieve satisfactory results. Descriptor 1 Mine Hoist Full Digital Speed ​​Control System Technical Transformation The annual output of the mine is 4 million, which is completed by two sets of lifting systems. The company adopts advanced technical solutions such as the unloading bucket rear bucket balancing gate and the signal improvement, transforming the jacket lifting system and stopping the other lifting system to ensure the completion of annual output and significant economic benefits. Descriptor 1 main lifting system optimization and transformation introduced the automatic balance of the full hydraulic automatic balance first rope system in the deep copper mine main shaft suspension system transformation process. The thesaurus hydraulic automatic balance first rope system first rope suspension system connector on the basis of a brief introduction of the characteristics of chain conveyor machinery, in order to improve energy efficiency, improve the design and structure of key components and the use of improvements .

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