High-efficiency concrete or coal slurry conveying system, control method thereof, and two-position three-way hydraulically-controlled directional control valve applied to high-efficiency concrete or coal slurry conveying system

Abstract

The invention discloses a high-efficiency concrete or coal slurry conveying system, a control method thereof, and a two-position three-way hydraulically-controlled directional control valve applied to the high-efficiency concrete or coal slurry conveying system. The system comprises three three-position four-way electromagnetic directional control valves and six two-position three-way hydraulically-controlled directional control valves, wherein output ends of the three three-position four-way electromagnetic directional control valves are reasonably connected with input ends of the six two-position three-way hydraulically-controlled directional control valves; and the three three-position four-way electromagnetic directional control valves directionally control the six two-position three-way hydraulically-controlled directional control valves by instructions of a programmable logic controller (PLC) so as to control the on and off of an oil line which flows from a main hydraulic pump to a main oil cylinder and an oscillating oil cylinder, so the aim of high-efficiency pumping is fulfilled. In the control method, connection and operation time sequences of the oil line are changed by using a control system consisting of a PLC, a sensor and a signal generation device which is matched with the sensor in operation. The two-position three-way hydraulically-controlled directional control valves are cartridge valves which are specially designed according to the system and different from the conventional sliding valves. The invention has the advantages of low working oil temperature, low working noise, high working efficiency, long service life, and stable and reliable operation.

Description

【Technical field】 [0001] The invention relates to the field of manufacturing concrete or coal slime conveying devices, in particular to a concrete or coal slime conveying system, a control method and a two-position three-way hydraulic control reversing valve applied to the system. 【Background technique】 [0002] The electro-hydraulic control system of concrete or coal slime conveying device is applied in concrete or coal slime transportation to complete the functions of pumping, distributing and mixing concrete or coal slime. The Chinese invention patent with patent number 200510031258.9 discloses a concrete Pump hydraulic system auxiliary energy storage flow increasing device (2), the background technology and invention content of this patent document show two kinds of electro-hydraulic control systems, one is composed of working oil circuit and stirring oil circuit, which is the so-called double-pump oil supply; One is composed of pumping oil circuit, distribution oil cir...

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Problems solved by technology

[0002] The electro-hydraulic control system of the concrete or coal slime conveying device, which is applied in the concrete or coal slime conveying to complete the functions of pumping, distributing and mixing of concrete or coal slime , Patent No. 200510031258.9 Chinese invention patent, discloses a concrete pump hydraulic system auxiliary energy storage flow increasing device (2), the background technology and invention content of this patent document shows two electro-hydraulic control systems, one is operated The oil circuit and the stirring oil circuit are composed of the so-called double-pump oil supply; the one is composed of the pumping oil circuit, the distribution oil circuit and the stirring oil circuit, which is the so-called three-pump oil supply; the former adopts the working method of single oil inlet and double oil return When the hydraulic system is working, it needs to rely on the mutual closure of the electro-hydraulic directional valve to maintain the pressure, and the long-term closure and pressurization will increase the internal leakage of the electro-hydraulic directional valve, and also cause the oil temperature to rise, shortening the hydraulic pump and the electro-hydraulic directional valve. Long service life of the directional valve, high energy consumption

The latter needs to control the cost, because the power of the power plant is fixed, in order to ensure that the displacement of the hydraulic pump used in the pumping oil circuit is large enough, the displacement of the hydraulic pump used in the swing distribution oil circuit should not be too large, in order to ensure the rapid reversing of the swing , the swing oil circuit needs to add constant pressure and energy storage and other auxiliary devices. Long-term constant pressure will lead to increased oil temperature, reduced work efficiency, high energy consumption, and easy damage to the hydraulic pump. If a high-power power device is used, the economy will decline. , when the two work, all oil cylinders need to be in a state of pressure, the working noise is large, and the failure rate is high; the three-position four-way electro-hydraulic control valve traditionally used in the concrete conveying system, in order to generate a built-in oil passage, the valve core used is Hollow, under the pressure of high-pressure oil, it is easy to produce bending deformation, has the disadvantages of large volume, small flow rate, poor sealing effect, large internal leakage, large pressure loss and noise, high failure rate, and short service life.

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