Hydraulic control apparatus for internal mixer

Abstract

The invention discloses a hydraulic control method and a hydraulic control apparatus for an internal mixer. The hydraulic control method comprises a step of using a hydraulic pump station composed of a hydraulic pump and an energy accumulator for hydraulic control of an upper ram, a discharging door and a charging door. The hydraulic control apparatus is characterized in that the hydraulic pump comprises a high pressure variable displacement piston pump supplying oil to the upper ram and a duplex vane pump supplying oil to the discharging door and the charging door, the duplex vane pump is connected with an auxiliary energy accumulator through an energy accumulator safety valve block, the pressure and the speed of the upper ram are controlled by a main PLC of the internal mixer, upper ram pressure control refers to pressure control of a rod-existing chamber of an upper ram oil cylinder, and the main PLC of the internal mixer realizes smooth control of opening and closing of the discharging door and opening and closing speeds through a proportional directional valve and a rotary oil cylinder. According to the invention, the hydraulic control apparatus for the internal mixer is simplified, the problems of a high failure rate of a hydraulic station and a short service life of a high pressure pump in the prior art are overcome, closed-loop control of upper ram pressure is realized through controlling of the main PLC of the internal mixer, upper ram pressure control is stable and highly precise, rubber fining quality is improved, and smooth control of the opening and closing speeds of the discharging door is realized.

Description

technical field [0001] The invention relates to an internal mixer, in particular to a control of the internal mixer, in particular to a hydraulic control method and device for the internal mixer. Background technique [0002] The internal mixer is the key equipment for processing rubber raw materials into semi-finished rubber in the rubber industry. It is mainly used for plasticizing and mixing of rubber. Partial composition. [0003] At present, the feeding and pressing device and unloading device of internal mixer often adopt hydraulic control mode, and its hydraulic pump station adopts high-pressure variable-variable plunger pump with remote setting and high-pressure small-variable plunger pump to drive, including upper jacking cylinder, All cylinder movements such as rotating cylinders. Through the computer control of the internal mixer, the combination of the high-pressure variable plunger pump, the safety valve block of the accumulator, and the accumulator can accura...

AI Technical Summary

Problems solved by technology

In actual work, there are the following problems: first, when switching between fast and slow speeds, the lower top bolt vibrates greatly, which has an adverse effect on the basic connection of the internal mixer; The speed cannot be adjusted, which will easily lead to damage to the rotary cylinder and the discharge door; third, due to the use of superimposed valves to control the switch of the discharge door, the superimposed valves are stacked very high, and the alternating impact load is more likely to cause oil leakage of the superimposed valve block, oil spill

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