Remote liquid level adjusting system

Abstract

The utility model discloses a remote liquid level adjusting system, which is vertically provided with a buoy communicated with a container to be measured, a magnetic floater is arranged in the buoy, the buoy is fixedly connected with a position sensor for sensing the position of the magnetic floater, and the position sensor is connected with a PLC (programmable logic controller) corresponding acquisition module and outputs sensing signals to the PLC corresponding acquisition module. The liquid level monitoring system has the advantages that liquid level information can be accurately obtained and transmitted to remote monitoring equipment in real time, and the HM I remotely pictures a liquid level parameter adjusting window, so that remote and rapid adjustment of liquid level parameters can be realized; and the non-disturbance liquid level signal selection button is additionally arranged on the HM I, so that two adjustment modes of remote transmission and field magnetic control switch can be selected corresponding to two sets of detection devices, and emergency replacement between liquid level signal faults can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level monitoring. Background Art

[0002] Liquid level detection and control have become a widespread reality in every aspect of production and daily life. Magnetic float level gauges are commonly used to detect the level of lubricating oil and hydraulic oil tanks. These floats, mounted within a buoy, utilize magnetic coupling to enable intuitive and convenient on-site observation of the liquid level within containers such as tanks and storage tanks via a magnetic flap. Their ability to operate safely and reliably in harsh environments, including low and high temperatures, high pressures, and severe corrosion, has led to their widespread use in industrial production.

[0003] In flammable and explosive environments where remote transmission of electrical signals is required, magnetic switches can be used to provide high and low level alarms and remote, real-time control of the liquid level. If a magnetic transmitter is installed alongside the magnetic float level gauge, the liquid level signal can be converted into an analog signal in real time. Remote control, indication, and recording can also be achieved through PLC systems and network connections. This technology is suitable for detecting the liquid level of media in equipment such as towers, tanks, tanks, spherical containers, and boilers, and is suitable for high-temperature, high-pressure, and corrosion-resistant environments.

[0004] For example, the public document with publication number CN213274488U, publication date 2021-05-25, and patent name "An Intelligent Electronic Monitoring Liquid Level Gauge" discloses an intelligent electronic monitoring liquid level gauge, including a shell, a liquid level tube in the shell, and a connecting tube connected to the liquid level tube. The liquid level tube is installed in the shell, and an LED lamp is installed in the shell. The LED lamp is electrically connected to a first magnetic switch. A permanent magnetic float is provided in the inner cavity of the liquid level tube, and a second magnetic switch is also provided in the upper and lower positions of the inner cavity of the shell. The second electromagnetic switch is also electrically connected to an alarm, which can sound an alarm when the liquid level is low or high.

[0005] While similar liquid level detection equipment can be used in conjunction with magnetic switches to achieve remote alarm and control of liquid levels, changing the liquid level setting requires maintenance personnel to go on-site to adjust the position of the magnetic switch on the side. This undoubtedly increases the operational risk for personnel in hazardous locations such as high temperature and high pressure. Furthermore, the magnetic switch position adjusted on-site is not reflected in the remote HMI interface, making it difficult for operators to understand the control difference between the actual liquid level and the set level position, making it difficult for operators to take preemptive control measures. Furthermore, on-site debugging of the magnetic switch is time-consuming, interlock condition testing is inconvenient, and reliability is poor. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to realize a remote liquid level adjustment system capable of remote adjustment, monitoring and chain control.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a remote liquid level adjustment system, the system is vertically provided with a float connected to the container to be measured, a magnetic float is provided in the float, and a position sensor that senses the position of the magnetic float is fixed to the float, and the position sensor is connected to and outputs the sensing signal to the corresponding acquisition module of the PLC.

[0008] The device for the container to be tested is equipped with a PLC, and the corresponding acquisition module of the PLC is connected and outputs the sensing signal to the PLC. The PLC communicates with the monitoring device in a wireless or wired manner.

[0009] The monitoring device includes an HMI human-computer interaction device, which is provided with a display screen for displaying liquid level parameters and an input mechanism for inputting control parameters.

[0010] The power supply end of the PLC is connected to a power failure protector.

[0011] A flip indicator of an inductive magnetic float is vertically fixed beside the float, and a plurality of magnetic control switch sockets are provided along the flip indicator. Magnetic control switches are installed on some or all of the magnetic control switch sockets.

[0012] The output ends of the magnetic control switch and the corresponding acquisition module of the PLC are both connected to the PLC through signals.

[0013] The PLC is equipped with a remote liquid level acquisition program module, a conversion control program module, and an HMI remote liquid level parameter adjustment window module.

[0014] The upper and lower parts of the float are both provided with connection flanges for communicating with the container to be tested, and the bottom of the float is provided with a sewage outlet, and the sewage outlet is provided with a sewage valve.

[0015] The advantage of the present invention is that it can accurately obtain liquid level information and transmit it to the remote monitoring equipment in real time. The HMI remote screen is provided with a liquid level parameter adjustment window, which can realize remote and rapid adjustment of liquid level parameters. In addition, by adding a non-disturbance liquid level signal selection button on the HMI, two adjustment modes, remote transmission and on-site magnetic control switch, can be realized. Corresponding to two sets of detection devices, emergency replacement can be realized in the event of liquid level signal failure.

[0016] This system can be used for remote adjustment and setting of the medium liquid level of various towers, tanks, tanks, box-spherical containers and boilers, so that the adjustment of the liquid level signal can be kept away from dangerous places such as high temperature, high pressure, flammable, explosive, corrosive, etc. where the risk of personnel entering is high and inspection is inconvenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following is a brief description of the contents and marks in each figure in the utility model specification:

[0018] Figure 1 This is a schematic diagram of the float structure of the remote liquid level adjustment system;

[0019] The marks in the above figure are: 1. flap indicator; 2. magnetic float; 3. float; 4. connecting flange; 5. drain valve; 6. position sensor. DETAILED DESCRIPTION

[0020] Below, with reference to the accompanying drawings, through the description of the embodiments, the specific implementation methods of the present invention, such as the shape, structure, relative positions and connection relationships of the various components involved, the functions and working principles of the various parts, the manufacturing process and operating methods, etc., are further explained in detail to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0021] The remote liquid level adjustment system can be used to detect the existing liquid level measurement mechanism of a float 3. The float 3 has connecting flanges 4 at both its top and bottom for connecting to the container to be measured. The bottom of the float 3 is equipped with a drain outlet equipped with a drain valve 5. A position sensor 6 (analog liquid level sensor) using the magnetic coupling principle is vertically mounted on the side of the liquid level float 3. Position sensor 6 is a device that uses the magnetic coupling principle to detect the magnetic float 2. Many existing structures can be used. For example, a strip-shaped position sensor 6 has equally spaced flaps (iron films) that are affected by the magnetic float 2. The overall structure is similar to the existing flap indicator 1. A sensor is fixed next to each flap to sense the flap's state. For example, the flap uses a contact point that connects the electrical circuit. When the magnetic float 2 reaches a certain flap position, the flap connects the corresponding position circuit. Each flap is connected to a processor, which can then obtain the position of the magnetic float 2. This can serve as a position sensor 6. However, other sensing devices capable of sensing the position of the magnetic float 2 can also be used.

[0022] The position sensor 6 is a strip-shaped structure fixed to the side of the buoy 3. It connects to and outputs sensing signals to the corresponding acquisition module of the PLC, which transmits the real-time liquid level to the corresponding acquisition module of the PLC. The container to be measured is generally an oil storage mechanism of a certain equipment, which generally has a PLC for overall control. The corresponding acquisition module of the PLC connects to and outputs sensing signals to the PLC. The PLC can control the operation of the equipment based on the acquired signals and pre-programmed programs. For example, it compares the real-time liquid level signal with the maximum liquid level, high liquid level, low liquid level, and minimum liquid level digital settings set by the HMI to obtain corresponding first, second, third, fourth, and so on liquid level switch output signals, which are used to control the corresponding logical operation process and implement the corresponding interlocking function. To prevent slight repeated fluctuations of the liquid level near the set value from causing the liquid level switch output of the PLC to repeatedly open and close after signal comparison, a certain hysteresis (liquid level offset in the program) can be designed around each set value. This effectively avoids frequent fluctuations of the liquid level near the set level, which would cause frequent changes in the liquid level control logic, and promotes stable liquid level detection and reliable function.

[0023] The PLC is typically installed near the equipment. A power failure protector is connected to the PLC's power supply to prevent all set liquid level data from automatically resetting to zero if the PLC loses power. To facilitate remote control, the PLC communicates with monitoring equipment wirelessly or wiredly. The monitoring equipment typically uses a HMI (Human Machine Interface) interface (HMI) with a display showing liquid level parameters and an input window for entering control parameters. The HMI, which communicates remotely with the PLC, can be designed with corresponding first, second, third, fourth, and so on, liquid level setting windows to enable on-screen setting and input of liquid level heights.

[0024] The existing measuring equipment can be used as a backup solution. A flap indicator 1 with an inductive magnetic float 2 vertically fixed next to the buoy 3 can be used for on-site liquid level monitoring. Multiple magnetic switch sockets are located along the flap indicator 1, with magnetic switches installed in some or all of these sockets. Through PLC programming, data from the two liquid level detection devices can be freely and seamlessly switched between remote parameter adjustment and on-site magnetic switch adjustment. This can be used to address the needs of one detection device failure, on-site inspections (e.g., when on-site maintenance requires more direct on-site signal detection and control), and other reasons.

[0025] The utility model can realize remote control by designing each liquid level setting window on the HMI interface. The parameters of this window are connected to the PLC system through a communication method (which can be any method such as bus, Ethernet, optical fiber, 5G wireless, etc. to realize remote data transmission). The PLC substitutes the parameters input in the HMI screen window into the program operation to obtain the corresponding liquid level switch value to realize the corresponding control logic function, and complete the liquid level alarm, tripping and control functions. Through the remote liquid level parameter setting function of the HMI interface, there is no need for manual adjustment of the liquid level magnetic control switch on site, thereby avoiding the safety risks of personnel working in dangerous places such as flammable and explosive places, high temperature and high pressure places, etc.

[0026] Because the remote HMI interface clearly displays actual liquid level data and set level parameters, inspections and adjustments are more convenient, accurate, efficient, and reliable. Operators and inspectors can more accurately and promptly predict the logical control margin of the liquid level. Through PLC programming and optimized HMI interface design (adding corresponding selection buttons to the HMI screen), it is possible to switch between remote liquid level parameter adjustment and on-site magnetic control switch readings without disturbance. This allows for greater freedom in selecting liquid level signals. With two optional detection devices, remote transmission and on-site magnetic control switch adjustment methods, enabling emergency replacement of one another in the event of a liquid level signal failure.

[0027] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A remote liquid level adjustment system, comprising a vertically mounted float connected to a container to be measured, wherein a magnetic float is disposed within the float, and wherein: The float is fixedly connected to a position sensor for sensing the position of the magnetic float, and the position sensor is connected to and outputs a sensing signal to a corresponding acquisition module of the PLC.

2. The remote liquid level adjustment system according to claim 1, characterized in that: The device for the container to be tested is equipped with a PLC, and the corresponding acquisition module of the PLC is connected and outputs the sensing signal to the PLC. The PLC communicates with the monitoring device in a wireless or wired manner.

3. The remote liquid level adjustment system according to claim 2, characterized in that: The monitoring device includes an HMI human-machine interaction device, and the HMI human-machine interaction device is provided with a display screen for displaying liquid level parameters and an input mechanism for inputting control parameters.

4. The remote liquid level adjustment system according to claim 3, characterized in that: The power supply end of the PLC is connected to a power failure protector.

5. The remote liquid level adjustment system according to any one of claims 1 to 4, characterized in that: A flip indicator of an inductive magnetic float is vertically fixed beside the float, and a plurality of magnetic control switch sockets are provided along the flip indicator. Magnetic control switches are installed on some or all of the magnetic control switch sockets.

6. The remote liquid level adjustment system according to claim 5, characterized in that: The output ends of the magnetic control switch and the corresponding acquisition module of the PLC are both connected to the PLC through signals.

7. The remote liquid level adjustment system according to claim 6, characterized in that: The PLC is provided with a remote liquid level acquisition program module, a conversion control program module, and an HMI remote liquid level parameter adjustment window module.

8. The remote liquid level adjustment system according to claim 1 or 7, characterized in that: The upper and lower parts of the float are both provided with connection flanges for communicating with the container to be tested, and the bottom of the float is provided with a sewage outlet, and the sewage outlet is provided with a sewage valve.

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