Crusher abnormal feeding control method based on pressure change rate and crusher

Abstract

The invention discloses a crusher abnormal feeding control method based on pressure change rate. The method comprises the steps: collecting pressure value of a hydraulic pipeline; comparing the pressure value of the pipeline with a first early warning pressure value, and if the pressure value of the pipeline is greater than or equal to the first early warning pressure value, alarming and stopping;checking whether the pressure value of the pipeline is continuously increased or not, if the continuous rising frequency reaches an early warning frequency and the pressure value of the pipeline reaches a second early warning pressure value, alarming and stopping; and checking whether the current pressure value of the hydraulic pipeline exceeds a reverse rotating pressure value or not, starting ahydraulic motor to rotate reversely if the current pressure value of the hydraulic pipeline exceeds the reverse rotating pressure value, otherwise, circulation continues. According to the technical scheme, a pressure sensor is used for detecting the pressure value of the hydraulic pipeline and capable of converting the pressure signal into 4-20 milliampere current signals within a few seconds, onthe one hand, a PLC continuously detects the change rate of the current signals, and when the change rate is greater than a set value, large metal feeding abnormity is confirmed, and alarming and stopping are carried out; and on the other hand, the PLC determines whether the pressure value of the hydraulic pipeline rises continuously so as to quickly determine that a knife box is stuck and cannotrotate due to too large bundle of materials.

Description

technical field [0001] The invention relates to a garbage crusher, in particular to a method for controlling abnormal feeding of the crusher based on a pressure change rate and the crusher. Background technique [0002] With the increasing awareness of global environmental protection, especially my country's great emphasis on garbage classification and recycling, the application of garbage crushers is becoming more and more common. The power of the crusher is divided into two categories: electric drive and hydraulic drive. Hydraulic drive is popular for its high power, fast response, simple control and stable operation. Hydraulic drive is usually a hydraulic motor connected to the cutter shaft through a reducer, which drives the cutter shaft to rotate, and the oil pump provides power. Due to the difference in shape of the waste materials to be crushed, the diversity of feeding methods and the discontinuity of feeding, it is inevitable that the knife box will be stuck. As lo...

AI Technical Summary

Problems solved by technology

[0005] This method has the following defects: (1) It is impossible to distinguish whether the material jam is caused by excessive feeding, which causes blockage or not much feeding, but the material is mixed with large pieces of metal that are difficult to break, such as pig iron blocks, etc.

The presence of large pieces of metal will inevitably lead to damage to the cutter teeth in multiple forward and reverse cycles, resulting in certain losses

(2) Since there is no distinction between the severity of the jammed material, if it is a small lump, it can be broken after several forward and reverse cycles, but if the whole bundle of materials fills the knife box, it will make the knife shaft "hard to move", Forward and reverse cycle does not help, wastes time

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