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Hydraulic control system for overcoming harmful oscillation of oil cylinder of four-roll crusher

A hydraulic control system, roll crusher technology, applied in fluid pressure actuation system components, mechanical equipment, fluid pressure actuation devices, etc., can solve the problems of shortening the service life of crushing rollers, affecting product quality, running coarse materials, etc. To achieve the effect of avoiding frequent adjustments and violent shocks, avoiding inaccurate settings, and improving protection capabilities

Inactive Publication Date: 2018-04-06
NANJING MEISHAN METALLURGY DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to realize that the actual value of the controlled variable is consistent with the predetermined value required by the process, in the program, the adjustment of the proportional reversing valve is automatically adjusted by PID. Since the particle size and flow rate of the upstream feed of the four-roll crusher are not very stable, Especially when a large piece or foreign object enters, the signal of the feedback analog quantity will fluctuate greatly, which will cause frequent adjustment and severe vibration of PID. Frequent and violent movements, the frequent movements of the proportional reversing valve spool will cause frequent and violent extension and contraction of the oil cylinder with displacement sensor, which will eventually lead to the phenomenon of running rough material and hitting the roller, which not only affects the quality of the product, but also shortens the The service life of the crushing roller
Those skilled in the art have been trying new solutions, but this problem has not been well resolved

Method used

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  • Hydraulic control system for overcoming harmful oscillation of oil cylinder of four-roll crusher

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: see figure 1 , a hydraulic control system to overcome the harmful vibration of a four-roller crusher oil cylinder, the hydraulic control system includes a proportional reversing valve 1, a two-position four-way electromagnetic reversing valve 2, a hydraulic lock 3, and a two-position two-way electromagnetic on-off valve 4. Pressure sensor 5, displacement sensor 6, hydraulic cylinder 7, moving roller 8, fixed roller 9 and PLC controller 11, the P port of the proportional reversing valve 1 is connected to the oil inlet pipe P, and the T port of the proportional reversing valve 1 The port is connected with the oil return pipe T, the A port and the B port of the proportional reversing valve 1 are respectively connected with the two A ports of the hydraulic lock 3, and the two B ports of the hydraulic lock 3 are respectively connected with the rodless rods of the hydraulic cylinder 7. The control port X of the hydraulic lock 3 is connected to the B port of the two...

Embodiment 2

[0016] Example 2: see figure 1 , a hydraulic control method for overcoming harmful vibration of a four-roller crusher oil cylinder, the method is as follows:

[0017] 1) Start the hydraulic system through the PLC controller 11. The PLC controller 11 detects and feedbacks the position of the oil cylinder 7 through the displacement sensor 6, and the feedback result is passed through the proportional reversing valve 1 to realize the advance of the oil cylinder to the working position of the preset value. After holding, the crushing roll gap is formed between the moving roll 8 and the fixed roll 9, and its position is automatically adjusted by PID, and the adjustment process takes a certain time, and then maintains a basic stability;

[0018] 2) Start the upper belt discharging, the material 10 passes through the crushing roll gap maintained between the relatively rolling moving roller 8 and the fixed roller 9 and is crushed and passes through. During the use process, when the flo...

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Abstract

The invention relates to a hydraulic control system for overcoming the harmful oscillation of an oil cylinder of a four-roll crusher. The hydraulic control system is characterized in that the hydraulic control system comprises a proportional directional valve, a two-position four-way electromagnetic directional valve, a hydraulic lock, a two-position two-way electromagnetic on-off valve, a pressure sensor, a displacement sensor, a hydraulic cylinder, a moving roller, a fixed roller, and a PLC. According to the technical scheme of the hydraulic control system, the structure is compact, simple,and safe, frequent adjustment and considerable oscillation of PID resulting in the phenomena of rough material running and roller crash can be effectively avoided, the product quality is improved, andthe service life of the equipment is prolonged.

Description

technical field [0001] The invention relates to a control system, in particular to a hydraulic control system for overcoming harmful vibration of an oil cylinder of a four-roller crusher, belonging to the field of hydraulic and automatic control. Background technique [0002] In the new four-roll crusher, a technology of automatic adjustment of the roller gap controlled by PLC is adopted. The displacement sensor and pressure sensor of the moving roller cylinder respectively input the detected signals through the analog signal input module into the PLC controller, and the PLC is controlled by the PLC. The controller outputs analog signals to the proportional reversing valve through the analog signal output module, and the proportional reversing valve performs different reversing actions according to the obtained different analog signals, and controls the hydraulic cylinder to achieve different displacement requirements. In order to realize that the actual value of the control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B21/08B02C4/32B02C25/00
CPCB02C4/32B02C25/00F15B21/087
Inventor 贾方俊鲁绪松孙建福
Owner NANJING MEISHAN METALLURGY DEV
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