Unloading pump in-situ protection control device with error prevention and error correction functions

Abstract

The invention provides an unloading pump in-situ protection control device with error prevention and error correction functions. The device comprises a pre-starting self-reset switch, a pressure detection switch and an unloading pump switch; the first end of the pre-starting self-reset switch and the first end of the pressure detection switch are connected with a control power supply, the second end of the pre-starting self-reset switch is connected with the third end of the pressure detection switch, and the second end of the pressure detection switch is connected with the first end of the unloading pump switch. According to the unloading pump in-situ protection control device with the error prevention and error correction functions, the basic structure and working process of an unloadingpump safety protection interlocking control device are thoroughly changed and simplified, so that the reliability, economical efficiency and implementation convenience of the unloading pump safety protection interlocking control device are greatly improved.

Description

technical field [0001] The invention relates to automatic control technology, in particular to an on-site protection control device for an unloading pump with functions of error prevention and error correction. Background technique [0002] There is no liquid level gauge on tank trucks for atmospheric hazardous chemicals, so it is difficult to monitor the liquid level of tank trucks during the unloading process. Operators need to go up to the top of the tank trucks and observe the stock of materials in real time through the feed port. Hazardous chemicals under pressure Although the tank truck is equipped with a liquid level gauge, it also requires the operator to observe the change of the liquid level on site at all times, which is labor-intensive and prone to fatigue and mistakes. If the operator of the two types of tankers is negligent during the unloading process, it is very easy to cause the unloading pump to evacuate (vaporize) and cause damage to the equipment, followe...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the widely used method of controlling the unloading pump is to use DCS or PLC to remotely interlock and stop the pump with the help of pressure, liquid level, flow, etc., but the DCS or PLC method is complex in technical system, high in requirements, and slow in control speed , the control process is long, there are many nodes, there are many faults, the investment is large, the maintenance cost is high, it does not have the error prevention and error correction function of the control process, it cannot be found in time after the interlock fails, the reliability is poor, and the main device (DCS) is required Can only be installed after shutdown

[0004] Therefore, the structure of the unloading pump protection and control device in the prior art is relatively complicated, resulting in cumbersome work flow, low reliability, low economy and low implementation convenience of the unloading pump protection and control device.

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