阅读说明：本技术 一种隔爆离心机排渣控制系统及控制方法 (Slag discharge control system and control method for explosion-proof centrifugal machine ) 是由 楼辉阳 张涛 袁竹 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种隔爆离心机排渣控制系统及控制方法,所述系统包括机械装置子系统和电路控制子系统；所述机械装置子系统包括两个电动阀(4)、储料桶(5)和氮气进气管(1)；所述电路控制子系统包括进气电磁阀(2)、阀门电动执行器(6)、压力传感器(7)和PLC控制系统(8)；离心机运行过程中,通过位于储料筒两端的电动阀(4)在控制系统作用下交替开闭实现离心机的正常排渣；电动阀(4)的自密封能够起到保压,同时也能减弱离心机在高速运转在排渣口处产生较大的排风压力,减小压力损失；通过控制系统对储料筒进行实时压力监控和充氮气补压,保证排渣过程中的保压和隔离空气的作用。(The invention discloses a slag discharge control system and a control method of a flameproof centrifuge, wherein the system comprises a mechanical device subsystem and a circuit control subsystem, the mechanical device subsystem comprises two electric valves (4), a storage barrel (5) and a nitrogen inlet pipe (1), the circuit control subsystem comprises an air inlet electromagnetic valve (2), a valve electric actuator (6), a pressure sensor (7) and a P L C control system (8), the normal slag discharge of the centrifuge is realized by alternately opening and closing the electric valves (4) at the two ends of the storage barrel under the action of the control system in the operation process of the centrifuge, the self-sealing of the electric valves (4) can play a role in pressure maintaining, the large exhaust pressure generated at a slag discharge port when the centrifuge operates at a high speed can be weakened, the pressure loss is reduced, and the real-time pressure monitoring and nitrogen filling and pressure supplementing are carried out on the storage barrel through the control system, so that the effects of pressure maintaining and air isolating.)

1. A slag discharge control system of a flameproof centrifuge is characterized by comprising a mechanical device subsystem and a circuit control subsystem, wherein the mechanical device subsystem comprises two electric valves (4), a storage barrel (5) and a nitrogen gas inlet pipe (1), the circuit control subsystem comprises a gas inlet electromagnetic valve (2), a valve electric actuator (6), a pressure sensor (7) and a P L C control system (8), the two electric valves (4) are respectively fixed at two ends of the storage barrel (5), the two electric valves (4) are connected with the valve electric actuator (6), the valve electric actuator (6) is connected with the P L C control system (8), the nitrogen gas inlet pipe (1) is fixed on the side face of the storage barrel (5) and extends into the storage barrel (5), the gas inlet electromagnetic valve (2) is arranged on the nitrogen gas inlet pipe (1), and the gas inlet electromagnetic valve (2) is connected with the P L C control system (8).

2. The slag discharge control system of the flameproof centrifuge according to claim 1, wherein flanges (3) are arranged at both ends of the storage barrel (5), and the valve device is arranged on the end faces of the flanges (3) and fixedly connected with the flanges (3) through bolts.

3. The slag discharge control system of the flameproof centrifuge according to claim 1, wherein the air inlet solenoid valve (2) comprises a valve core and an electromagnetic controller, the electromagnetic controller is connected with the valve core, and the electromagnetic controller is connected with the P L C control system (8) to supplement nitrogen and boost pressure in real time.

4. The slag discharge control system of the flameproof centrifuge according to claim 3, wherein the pressure sensor (7) is fixedly arranged on the side surface of the storage barrel (5) to monitor the pressure in the storage barrel (5) in real time, and the pressure sensor (7) is connected with the P L C control system (8).

5. The slag discharge control system of the flameproof centrifuge according to claim 4, wherein the pressure sensor (7) monitors the internal pressure of the storage barrel (5) in real time, and the P L C control system (8) controls the air inlet solenoid valve (2) to open/close the nitrogen inlet pipe (1) to supplement nitrogen to maintain the constant pressure in the storage barrel (5).

6. The control method of the slag discharge control system of the flameproof centrifuge according to the claims 1 to 5, characterized by comprising the following steps:

s1, setting a discharging interval time and opening interval times of two electric valves (4) by a P L C control system (8);

s2, when the centrifuge does not discharge slag, the electric valve (4) above the storage barrel (5) is opened, the electric valve (4) below the storage barrel (5) is closed, and the materials separated by the centrifuge enter the storage barrel (5);

s3, when the set slag discharge time is up, the P L C control system (8) controls the valve electric actuator (6) to close the electric valve (4) above the storage barrel (5);

s4, after the electric valve (4) above the storage barrel (5) is closed in place, the electric valve (4) below the storage barrel (5) is controlled by the P L C control system (8) to slowly open the valve electric actuator (6) for discharging;

s5, when the set discharging interval time is up, the P L C control system (8) controls the air inlet electromagnetic valve (2) to open the nitrogen inlet pipe (1) to start to supplement nitrogen and discharge air, and meanwhile, the electric valve (4) below the storage barrel (5) controls the valve electric actuator (6) to start to close through the P L C control system (8);

s6, when the electric valve (4) below the storage barrel (5) is controlled by the P L C control system (8) to control the valve electric actuator (6) to be closed in place, the P L C control system (8) controls the valve electric actuator (6) to open the electric valve (4) above the storage barrel (5);

s7, stopping supplementing nitrogen after the electric valve (4) above the storage barrel (5) is opened in place;

and S8, when the next set discharging interval time of the P L C control system (8) is reached, the electric valve (4) is opened alternately for discharging in one cycle.

Technical Field

The invention relates to an explosion-proof technology of a centrifugal machine, in particular to a slag discharge control system of an explosion-proof centrifugal machine and a control method thereof.

Background

When the materials processed by the centrifuge contain organic solvents such as methanol, ethanol, acetone and the like, because of the characteristics of flammability and explosiveness, most of the industries have requirements on protective measures such as explosion prevention for the centrifuge, nitrogen protection is the most commonly used protective control mode at present, three element temperatures for preventing explosion, fire sources and oxygen exist simultaneously, in the operation process of the centrifuge, the centrifuge is separated by high-speed operation, a large exhaust pressure can be generated at a slag discharge port, the pressure loss of a nitrogen protection system is large, the centrifuge is easy to form negative pressure, air enters an inner cavity of the centrifuge, and the nitrogen protection system fails.

Disclosure of Invention

The invention aims to provide a slag discharge control system of a flame-proof centrifugal machine, wherein electric valves at two ends of a material storage cylinder are controlled by a P L C system, the pressure maintaining and slag discharge functions are realized by timing and alternative opening and closing, and meanwhile, the pressure is supplemented by a nitrogen inlet pipe to discharge air by pressure detection feedback of a pressure sensor, so that flame-proof is realized.

A slag discharge control system of a flame-proof centrifugal machine comprises a mechanical device subsystem and a circuit control subsystem, wherein the mechanical device subsystem comprises two electric valves, a storage barrel and a nitrogen inlet pipe, the circuit control subsystem comprises an air inlet electromagnetic valve, a valve electric actuator and a P L C control system, the two electric valves are respectively fixed at two ends of the storage barrel and are connected with the valve electric actuator, the valve electric actuator is connected with the P L C control system, the nitrogen inlet pipe is fixed on the side face of the storage barrel, and an air inlet electromagnetic valve is arranged on the nitrogen inlet pipe and is connected with the P L C control system.

Furthermore, the slag discharge control system of the flame-proof centrifugal machine is characterized in that flanges are arranged at two ends of the storage barrel, and the valve device is arranged on the end faces of the flanges and fixedly connected with the flanges through bolts.

Further, the deslagging control system of the explosion-proof centrifugal machine comprises an air inlet electromagnetic valve and an electromagnetic controller, wherein the electromagnetic controller is connected with the valve core, and is connected with a P L C control system to supplement nitrogen and boost pressure in real time.

Further, the slag discharge control system of the flameproof centrifuge further comprises a pressure sensor, wherein the pressure sensor is fixed on the side face of the storage barrel and monitors the pressure in the storage barrel in real time, and the pressure sensor is connected with the P L C control system.

Further, in the slag discharge control system of the flame-proof centrifugal machine, a pressure sensor monitors the internal pressure of the storage barrel in real time, the P L C control system controls the air inlet electromagnetic valve to open/close the nitrogen inlet pipe to supplement nitrogen to keep the internal pressure of the storage barrel constant, and the P L C control system can clean the storage barrel after the slag discharge machine is stopped.

The invention discloses a control method of a slag discharge control system of a flameproof centrifuge, which comprises the following steps:

s1, setting a discharging interval time and opening interval times of two electric valves by a P L C control system;

s2, when the centrifuge does not discharge slag, the electric valve above the storage barrel is opened, the electric valve below the storage barrel is closed, and the materials separated by the centrifuge enter the storage barrel;

s3, when the set slag discharge time is up, the P L C control system controls the valve electric actuator to close the electric valve above the storage barrel;

s4, after the upper electric valve is closed in place, the electric valve below the storage barrel is controlled by the P L C control system to control the valve electric actuator to be opened slowly for discharging;

s5, when the set discharge interval time is up, the P L C control system controls the air inlet electromagnetic valve to open the nitrogen inlet pipe, nitrogen is supplemented to exhaust air, and meanwhile the electric valve below the storage barrel controls the valve electric actuator to close through the P L C control system;

s6, when the electric valve below the storage barrel is closed in place by the electric actuator of the control valve of the P L C control system, the electric actuator of the control valve of the P L C control system opens the electric valve above the storage barrel;

s7, stopping supplementing nitrogen after the electric valve above the storage barrel is opened in place;

and S8, when the next set discharging interval time of the P L C control system is reached, the electric valve is opened alternately in one cycle to discharge.

The invention achieves the following beneficial effects:

the invention provides a slag discharge control system of a flameproof centrifuge, which is suitable for a slag discharge process of the centrifuge. The slag discharge control system of the flameproof centrifuge receives signals of the pressure sensor, controls the on-off of the air inlet electromagnetic valve, and can ensure the pressure in the material storage cylinder and isolate air in the slag discharge process in real time; the opening and closing of the electric valve are controlled by the control system, so that the slag discharge process of the centrifuge is effectively finished; the electric valve has a self-sealing function, can maintain pressure of the material storage cylinder and weaken the air exhaust pressure generated at a slag discharge port when the centrifuge runs at a high speed, so that the centrifuge runs safely.

Drawings

FIG. 1 is a schematic diagram of a slag discharge control system of a flameproof centrifuge.

Fig. 2 is a control configuration diagram.

FIG. 3 is a schematic diagram of a control method of a slag discharge control system of a flameproof centrifuge.

In the figure, 1-nitrogen inlet pipe, 2-air inlet electromagnetic valve, 3-flange, 4-electric valve, 5-material storage barrel, 6-valve electric actuator, 7-pressure sensor and 8-P L C control system.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the examples of the present invention will be described clearly and completely with reference to the accompanying drawings in the examples of the present invention. It is to be understood that the described embodiments are merely exemplary of some, and not necessarily all, embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.