Automatic conveying control system of self-priming pump

Abstract

The utility model provides a self-priming pump conveying automatic control system which comprises a water storage tank, a water inlet pipe is arranged in the water storage tank, a radar liquid level meter is arranged on the inner wall of the water storage tank, a first self-priming pump and a second self-priming pump are arranged on the side portion of the water storage tank, and the first self-priming pump, the second self-priming pump and the first self-priming pump are communicated through pipelines. A first electric valve and a second electric valve are sequentially arranged on a pipeline between the first self-priming pump and the second self-priming pump, and an outlet main valve, an electromagnetic flowmeter and a pressure transmitter are sequentially arranged on the side portion of the second electric valve and communicated through pipelines. According to the self-priming pump control system, the problem that an existing self-priming pump control system cannot achieve accurate flow and pressure control can be solved, and the running state of the self-priming pump can be monitored and adjusted in real time.

Description

Technical Field

[0001] The utility model belongs to the technical field of tailings pond return water transportation, and relates to an automatic control system for self-priming pump transportation. Background Technique

[0002] In large domestic wet discharge tailings ponds, it is necessary to collect the precipitated water for reuse to achieve the purpose of saving water and at the same time play a role in protecting the surrounding environment. In order to reuse the return water in the reservoir area, it is necessary to build a water storage tank and a pumping station around the reservoir area to transport the collected water back to the production unit. In the production process of long-distance and high-lift return water transportation, the self-priming pump plays an important role, that is, the self-priming pump stably and efficiently transports the continuously flowing back water in the water storage tank back to the production unit. The changes in the water inflow in the tailings pond reservoir area, the return water consumption of the production unit, and the operation status of the equipment all need to be constantly monitored by the on-duty personnel and adjusted in a timely manner. Therefore, the utility model provides an automatic control system for self-priming pump transportation for outdoor long-distance transportation systems to improve the operation stability of the transportation system and further improve production efficiency. Content of the Utility Model

[0003] The purpose of the utility model is to provide an automatic control system for self-priming pump transportation in view of the problems existing in the prior art, and solve the problems that the existing self-priming pump control system cannot achieve accurate flow and pressure control, nor can it monitor and adjust the operation status of the self-priming pump in real time.

[0004] To this end, the utility model adopts the following technical solutions:

[0005] An automatic control system for self-priming pump transportation includes a water storage tank. An inlet pipe is arranged inside the water storage tank, and a radar level gauge is arranged on the inner wall. A first self-priming pump and a second self-priming pump are arranged on the side of the water storage tank, and the three are connected by pipelines. A first electric valve and a second electric valve are sequentially arranged on the pipeline between the first self-priming pump and the second self-priming pump. An outlet main valve, an electromagnetic flowmeter and a pressure transmitter are sequentially arranged on the side of the second electric valve, and the four are connected by pipelines. The first electric valve and the second electric valve are connected in series; the outlet main valve is connected in parallel with the first electric valve and the second electric valve respectively; the outlet main valve is connected in series with the electromagnetic flowmeter and the pressure transmitter.

[0006] Further, the first self-priming pump is provided with a first temperature and vibration sensor, and the second self-priming pump is provided with a second temperature and vibration sensor.

[0007] An automatic control system for self-priming pump transportation further includes a controller, and the controller is electrically connected to the first electric valve, the second electric valve, the outlet main valve, the electromagnetic flowmeter and the pressure transmitter, the first temperature and vibration sensor and the second temperature and vibration sensor respectively; specifically, the controller adopts a Siemens programmable controller of model S7-1200.

[0008] The beneficial effects of the present utility model are as follows:

[0009] The present utility model can achieve the automatic control of the recycled use of the sedimentation water in the tailings pond area by the production unit. By monitoring the level of the water storage tank and dynamically adjusting the rotation speed of the self-priming pump, the purpose of regulating the conveying flow is achieved, so that the level of the water storage tank for temporarily transferring the return water of the tailings pond always remains at a safe level, avoiding the situations of the return water overflowing and the equipment operating inefficiently due to too low a level, improving the stability of the conveying system, and at the same time greatly reducing the frequency of manual adjustment and reducing the safety risk of manual operation. Brief Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the present utility model.

[0011] In the figure, 1 - water inlet pipe, 2 - water storage tank, 3a - first self-priming pump, 3b - second self-priming pump, 4a - first electric valve, 4b - second electric valve, 5 - outlet main valve, 6 - electromagnetic flowmeter, 7 - pressure transmitter, 8 - radar level gauge, 9a - first temperature and vibration sensor, 9b - second temperature and vibration sensor. Specific Embodiments

[0012] The technical solutions of the present utility model will be described in detail below in conjunction with the drawings and the embodiments.

[0013] As Figure 1 shown, a self-priming pump conveying automatic control system includes a water storage tank 2. Inside the water storage tank 2, there is a water inlet pipe 1, and on the inner wall, there is a radar level gauge 8. Specifically, the radar level gauge 8 is installed directly above the water storage tank 2.

[0014] On the side of the water storage tank 2, there are a first self-priming pump 3a and a second self-priming pump 3b, and the three are connected by pipelines. The first self-priming pump 3a and the second self-priming pump 3b are backup for each other and can also be started simultaneously. The outlet pipes of both are connected to a long-distance conveying pipeline; specifically, the drive motors of the first self-priming pump 3a and the second self-priming pump 3b are both variable-frequency motors. At the same time, the first self-priming pump 3a is equipped with a first temperature and vibration sensor 9a, and the second self-priming pump 3b is equipped with a second temperature and vibration sensor 9b.

[0015] On the pipeline between the first self-priming pump 3a and the second self-priming pump 3b, there are a first electric valve 4a and a second electric valve 4b in sequence. The first electric valve 4a and the second electric valve 4b are connected in series; the inlet conveying pipe of the first self-priming pump 3a extends into the bottom of the water storage tank 2, and the inlet conveying pipe of the second self-priming pump 3b extends into the bottom of the water storage tank 2.

[0016] On the side of the second electric valve 4b, an outlet main valve 5, an electromagnetic flowmeter 6, and a pressure transmitter 7 are successively arranged, and the four are connected through pipelines; in addition, the outlet main valve 5 is connected in parallel with the first electric valve 4a and the second electric valve 4b respectively, the outlet main valve 5 is connected in series with the electromagnetic flowmeter 6 and the pressure transmitter 7, and the electromagnetic flowmeter 6 and the pressure transmitter 7 are respectively used to detect the flow and pressure of the conveying pipeline in real time.

[0017] The utility model further includes a programmable controller, and the controller is electrically connected to the first electric valve 4a, the second electric valve 4b, the outlet main valve 5, the electromagnetic flowmeter 6, the pressure transmitter 7, the first temperature and vibration sensor 9a, and the second temperature and vibration sensor 9b respectively; specifically, the controller adopts a Siemens programmable controller of model S7-1200, and different alarm situations are set in its control program, including the self-priming pump stops, the liquid level reaches the high threshold, the liquid level reaches the low threshold, the motor temperature is relatively high, the motor vibration is relatively large, and a pop-up window prompt and an audible and visual alarm appear on the upper computer.

[0018] The controller is connected to the upper computer through an optical fiber. A PID dynamic control algorithm model is embedded in the backwater conveying system control software in the upper computer, and the audible and visual alarm is linked to the conveying system control software as an external device of the upper computer.

[0019] Both the first self-priming pump 3a and the second self-priming pump 3b are powered by a variable-frequency motor. The variable-frequency motor controls the input and output signals by a corresponding frequency converter, and then the control signals are connected to the programmable controller. A control interlock program for the first self-priming pump 3a, the second self-priming pump 3b, the first electric valve 4a, the second electric valve 4b, and the outlet main valve 5 is added to the upper computer conveying system control software to achieve the purpose of mutual backup of the two self-priming pumps, and the interlock control can also be released on the upper computer to realize the simultaneous conveying of the two self-priming pumps.

[0020] The use process of the utility model includes the following steps:

[0021] Step 1: Threshold setting: The upper computer presets the highest liquid level threshold and the lowest liquid level threshold of the reservoir, the rotational speed threshold of the motors of the first self-priming pump 3a and the second self-priming pump 3b, the highest operating temperature threshold, the vibration amplitude threshold, the pressure threshold of the pressure transmitter, and the flow threshold of the electromagnetic flowmeter.

[0022] Step 2: Operation of the conveying control system: Check the status feedback data. The liquid level in the water storage tank 2 is above the lowest threshold, and the data of the electromagnetic flowmeter 6 and the pressure transmitter 7 are normal. Remotely operate and send instructions on the upper computer control system software. Control the frequency conversion motor of the first self-priming pump 3a through the programmable logic controller to start the first self-priming pump 3a, open the first electric valve 4a, and at the same time close the second electric valve 4b to start the return water conveyance. When it is necessary to start the second self-priming pump 3b for the return water conveyance, send an instruction to stop the first self-priming pump 3a, close the first electric valve 4a, open the second electric valve 4b, and start the second self-priming pump 3b for the return water conveyance.

[0023] Step 3: Equipment status feedback of the conveying system and data acquisition of monitoring instruments: After the conveying system operates stably, the operating status of the first self-priming pump 3a, the second self-priming pump 3b and their motors, the opening and closing status of the first electric valve 4a, the second electric valve 4b and the outlet main valve 5, and the real-time data of the electromagnetic flowmeter 6, the pressure transmitter 7, the radar level gauge 8, the first temperature and vibration sensor 9a and the second temperature and vibration sensor 9b are all transmitted by the programmable logic controller to the upper computer in the management station control room through optical fibers.

[0024] Step 4: After the upper computer receives the equipment status of the conveying system and the data of the monitoring instruments, combined with the preset threshold, automatically control the self-priming pump conveying system through the interlock control and the PID dynamic control algorithm model: After the first self-priming pump 3a in operation suddenly fails and stops running, under the action of the controller, the second electric valve 4b automatically opens, the first electric valve 4a automatically closes, and the second self-priming pump 3b automatically starts.

[0025] In the present utility model, the upper computer can adopt the PID dynamic control algorithm model. Among them, the proportional action makes the input and output of the control algorithm in a proportional relationship, that is, the liquid level in the water storage tank 2 is in a proportional relationship with the frequencies of the two self-priming pump motors. The introduction of the integral action is beneficial to eliminating the steady-state error, making the dynamic adjustment of the motor frequency between the high liquid level and the low liquid level of the water tank more stable. Especially in the large deviation stage, the integral often causes the system to have too large an overshoot and the adjustment time becomes longer. It effectively reduces the frequency overshoot, improves the dynamic characteristics of the control system, and increases the stability of the return water flow of the conveying system.

Claims

1. A self-priming pump delivery automatic control system, characterized in that: The invention comprises a water reservoir (2), wherein a water inlet pipe (1) is provided inside the water reservoir (2), and a radar level meter (8) is provided on the inner wall thereof; a first self-priming pump (3a) and a second self-priming pump (3b) are provided on the side of the water reservoir (2), and the three are connected through a pipeline; a first electric valve (4a) and a second electric valve (4b) are provided on the pipeline between the first self-priming pump (3a) and the second self-priming pump (3b), and the first electric valve (4a) and the second electric valve (4b) are connected in series; an outlet main valve (5), an electromagnetic flowmeter (6) and a pressure transmitter (7) are provided on the side of the second electric valve (4b), and the four are connected through a pipeline; the outlet main valve (5) is connected in parallel with the first electric valve (4a) and the second electric valve (4b), respectively, and the outlet main valve (5) is connected in series with the electromagnetic flowmeter (6) and the pressure transmitter (7).

2. A self-priming pump delivery automatic control system according to claim 1, characterized in that: The first self-priming pump (3a) is provided with a first temperature vibration sensor (9a), and the second self-priming pump (3b) is provided with a second temperature vibration sensor (9b).

3. A self-priming pump delivery automatic control system according to claim 2, characterized in that: It also includes a controller, which is electrically connected to the first electric valve (4a), the second electric valve (4b), the outlet main valve (5), the electromagnetic flowmeter (6), the pressure transmitter (7), the first temperature vibration sensor (9a) and the second temperature vibration sensor (9b).

4. A self-priming pump delivery automatic control system according to claim 3, characterized in that: The controller is a Siemens programmable controller of model S7-1200.

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