A method for preventing equipment from tripping due to radar level meter failure

Abstract

The invention discloses a method for preventing equipment from tripping and stopping due to a fault of a radar level meter, comprising the following steps: S1: temporarily storing a liquid level value monitored by the level meter at time T1, which is recorded as H1; S2: recording a liquid level value monitored by the level meter at time T1+t(s) as H2, and comparing whether the liquid level values ​​H1 and H2 are always equal within time t-1(s); S3: if they are always equal in S2, inputting the liquid level value H2 to a system equipment controller, and executing an automatic reset circuit of the level meter at the same time; if they are not always equal in S2, inputting the liquid level value H1 to the system equipment controller, and re-recording and temporarily storing the liquid level value at time T1+t+1(s), and sequentially repeating steps S1, S2, and S3; S4: in S3, the automatic reset circuit of the level meter drives the level meter to restart, recording the liquid level value monitored at the restarting time T2 of the level meter as H3, and re-inputting the liquid level value H3 to the controller of the system equipment; the invention has a simple structure, a high degree of automation, reduces maintenance and system operation costs, and is conducive to wide promotion.

Description

Technical Field

[0001] The invention belongs to the technical field of level meter fault diagnosis, and relates to a method for preventing equipment from tripping and stopping due to a radar level meter fault. Background Art

[0002] Level is an important basis for judging production indicators and equipment status, and material containers can also play a fault-tolerant buffering role in the stable operation of the system. Therefore, the stable operation of level measuring instruments is crucial. Reducing the number of level instrument failures not only meets the key needs of key customers, but is also an effective way to improve the quality of maintenance services.

[0003] Radar level meter adopts microwave pulse measurement method, and can operate normally within the industrial rating band, with low beam energy, and can be installed in various metal and non-metal containers or pipes to perform non-contact continuous measurement of the level of liquid, slurry and granular materials. Level meter downtime refers to the phenomenon that the level meter cannot recover from a serious error, or there is a problem at the hardware level of the equipment, so that the equipment responds for a long time and the level meter has to be restarted. It is a normal phenomenon of the level meter running for an extended period of time, but this phenomenon will cause the liquid level data of the level meter to be lost, which may cause the controller of the system equipment to trip and stop. Summary of the invention

[0004] In view of the above problems, the present invention proposes a method for preventing equipment tripping caused by radar level meter failure, which effectively solves the problem in the prior art that level meter failure may lead to loss of liquid level data of the level meter and cause chain tripping of system equipment.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A method for preventing a radar level meter from tripping due to a fault, comprising the following steps:

[0006] S1: temporarily storing the liquid level value monitored by the level meter at time T1, recorded as H1;

[0007] S2: The liquid level value monitored by the level meter at time T1+t(s) is recorded as H2, and the liquid level values ​​H1 and H2 are compared to see whether they are always equal within time t-1(s);

[0008] S3: If S2 is always equal, the liquid level value H2 is input to the controller of the system equipment, and the automatic reset circuit of the level meter is executed; if S2 is not always equal, the liquid level value H1 is input to the controller of the system equipment, and the liquid level value at time T1+t+1(s) is re-recorded for temporary storage, and steps S1, S2, and S3 are repeated in sequence;

[0009] S4: The automatic reset circuit of the level meter in S3 causes the level meter to restart, and the liquid level value monitored at the restarting time T2 of the level meter is recorded as H3, and the liquid level value H3 is re-input into the controller of the system equipment.

[0010] Furthermore, a data selection module is used in S1 to select the liquid level value H1. The data selection module is connected to a first timing module. The timing period of the first timing module is t(s). Every time the first timing module times to t(s), the data selection module temporarily stores the liquid level value at time T1+t+1(s).

[0011] Furthermore, in S2, a data comparison module is used to compare the liquid level values ​​H1 and H2. The data comparison module is connected to a second timing module, and the timing period of the second timing module is t-1(s).

[0012] Furthermore, the liquid level values ​​H1 and H2 are judged to be always equal if the absolute value of the difference between them within the time t-1(s) is less than or equal to 0.1.

[0013] Furthermore, the automatic resetting circuit of the level meter includes a third timing module and an execution device connected to the third timing module, and the execution device is connected to the level meter.

[0014] Furthermore, the execution device includes an isolator, an analog input channel, a first switch channel, and a second switch channel. The analog input channel is connected to the isolator, the first switch channel is connected to the second switch channel, the second switch channel is connected to the isolator, and the isolator and the switch output channel are simultaneously connected to the level meter.

[0015] Furthermore, the timing period of the third timing module is 10s.

[0016] Furthermore, a pulse module is connected between the third timing module and the second timing module.

[0017] Furthermore, when the liquid level values ​​H1 and H2 in S2 are always equal within the time t-1(s), the second timing module sends a pulse signal with a duration of 1 s to the pulse module.

[0018] Furthermore, the t is set to 1200.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the present invention, it is possible to automatically determine whether the radar level meter is down within a fixed period, and when the level meter is down, automatically send a liquid level value to the controller of the system equipment to replace the electrical signal of the level meter, thereby preventing the system equipment from being tripped in a chain reaction; at the same time, the radar level meter can be automatically restarted, and the real data monitored by the radar level meter after the restart is transmitted to the controller of the system equipment; the present invention has a simple structure and a high degree of automation, reduces maintenance and system operation costs, and is conducive to wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an overall block diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the execution device of the present invention.

[0023] In the figure: 1-data selection module; 2-first timing module; 3-second timing module; 4-third timing module; 5-execution device; 6-pulse module; 7-data comparison module. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, a method for preventing a radar level meter from tripping due to a fault of the device according to the present invention comprises the following steps:

[0026] S1: temporarily storing the liquid level value monitored by the level meter at time T1, recorded as H1;

[0027] S2: The liquid level value monitored by the level meter at time T1+t(s) is recorded as H2, and the liquid level values ​​H1 and H2 are compared to see whether they are always equal within time t-1(s);

[0028] S3: If S2 is always equal, the liquid level value H2 is input to the controller of the system equipment, and the automatic reset circuit of the level meter is executed; if S2 is not always equal, the liquid level value H1 is input to the controller of the system equipment, and the liquid level value at time T1+t+1(s) is re-recorded for temporary storage, and steps S1, S2, and S3 are repeated in sequence;

[0029] S4: The automatic reset circuit of the level meter in S3 causes the level meter to restart, and the liquid level value monitored at the restarting time T2 of the level meter is recorded as H3, and the liquid level value H3 is re-input into the controller of the system equipment.

[0030] When the above technical solution is used, it can be automatically determined whether the radar level meter is down within a fixed period, and when the radar level meter is down, the liquid level value is automatically sent to the controller of the system equipment to replace the electrical signal of the level meter, so as to prevent the system equipment from being chained and stopped; at the same time, when the radar level meter is down, the radar level meter can be automatically restarted, and the real data monitored by the radar level meter can be transmitted to the controller of the system equipment; the present invention has a simple structure and a high degree of automation, reduces the maintenance and system operation costs, and is conducive to wide promotion.

[0031] In this embodiment, Figure 2 As shown, in S1, a data selection module 1 is used to select a liquid level value H1. The data selection module 1 is connected to a first timing module 2. The timing cycle of the first timing module 2 is t(s). When the first timing module 2 times to t(s), the data selection module 1 re-temporarily stores the liquid level value at the time T1+t+1(s). The data selection module 1 and the first timing module 2 constitute a data register. The first timing module 2 consists of a pulse block and a timer. When the timer times to the cycle t(s), a pulse signal is sent to the pulse block. The pulse module 6 sends an electrical signal to the pin S of the data selection module 1, triggers the pin Pv2 of the data selection module 1, and selects the liquid level value at the time T1+t+1; when the timer does not time to the cycle t(s), the pulse module 6 does not send an electrical signal to the pin S of the data selection module 1, triggers the pin Pv1 of the data selection module 1, and selects the liquid level value at the time T1; so that the data selection module 1 will re-temporarily store the liquid level value of the radar level meter every cycle t(s).

[0032] In S2, a data comparison module 7 is used to compare the liquid level values ​​H1 and H2. The data comparison module 7 is connected to a second timing module 3, and the timing period of the second timing module 3 is t-1(s). The data comparison module 7 and the second timing module 3 work simultaneously, and the second timing module 3 performs timing for the data comparison module 7 to determine whether the liquid level values ​​H1 and H2 are always equal within the time t-1(s). Specifically, the liquid level values ​​H1 and H2 are determined to be always equal if the absolute value of the difference between them within the time t-1(s) is less than or equal to 0.1, so that the data comparison module 7 has a higher judgment accuracy.

[0033] In this embodiment, the automatic reset circuit of the level meter includes a third timing module 4 and an execution device 5 connected to the third timing module 4, and the execution device 5 is connected to the level meter; specifically, the execution device 5 includes an isolator, an analog input channel, a first switch channel, and a second switch channel, the analog input channel is connected to the isolator, the first switch channel is connected to the second switch channel, the second switch channel is connected to the isolator, and the isolator and the switch output channel are connected to the level meter at the same time; when connected, the isolator is connected to a power supply, pins 1 and 2 of the power supply are respectively connected to pins 3 and 4 of the isolator, pins 1 and 2 of the isolator are respectively connected to pins 1 and 2 of the analog input channel, pin 6 of the isolator is connected to pin 3 of the second switch output channel, pin 4 of the second switch output channel and pin 5 of the isolator are connected to pins 2 and 1 of the radar level meter, and pins 1 and 2 of the first switch output channel are respectively connected to pins 1 and 2 of the second switch output channel. The timing cycle of the third timing module 4 is 10s. After the pulse block sends a signal to the third timing module 4, the third timing module 4 starts timing and sends a signal to the power supply after 10s, so that the isolator is powered and the radar level meter is restarted.

[0034] In this embodiment, a pulse module 6 is connected between the third timing module 4 and the second timing module 3; when the liquid level values ​​H1 and H2 in S2 are always equal within time t-1(s), the second timing module 3 sends a pulse signal with a duration of 1s to the pulse module 6; the pulse module 6 isolates the third timing module 4 and the second timing module 3 to prevent the timing from being affected by each other, thereby improving the reliability of the use of the present invention.

[0035] Preferably, the t is set to 1200, and the timing periods of 10s, 1s pulse signals and 1200 of the third timing module 4 are obtained through orthogonal experiments and are optimal values, which can make the radar level meter's downtime reset success rate reach 92.5%.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preventing equipment from tripping due to a radar level meter failure, characterized in that: The steps include: S1: temporarily storing the liquid level value monitored by the level meter at time T1, recorded as H1; S2: The liquid level value monitored by the level meter at time T1+ts is recorded as H2, and the liquid level values ​​H1 and H2 are compared to see whether they are always equal within the time (t-1)s; S3: If S2 is always equal, the liquid level value H2 is input to the controller of the system equipment, and the automatic reset circuit of the level meter is executed; if S2 is not always equal, the liquid level value H1 is input to the controller of the system equipment, and the liquid level value at time T1+(t+1)s is re-recorded for temporary storage, and steps S1, S2, and S3 are repeated in sequence; S4: The automatic reset circuit of the level meter in S3 causes the level meter to restart, and the liquid level value monitored at the restarting time T2 of the level meter is recorded as H3, and the liquid level value H3 is re-input into the controller of the system equipment; In S1, a data selection module is used to select the liquid level value H1. The data selection module is connected to a first timing module. The timing period of the first timing module is ts. When the first timing module times to ts each time, the data selection module temporarily stores the liquid level value at time T1+(t+1)s again. In S2, a data comparison module is used to compare the liquid level values ​​H1 and H2. The data comparison module is connected to a second timing module. The timing period of the second timing module is (t-1) s. The automatic reset circuit of the level meter includes a third timing module and an execution device connected to the third timing module. The execution device is connected to the level meter. A pulse module is connected between the third timing module and the second timing module. When the liquid level values ​​H1 and H2 in S2 are always equal within time (t-1)s, the second timing module sends a pulse signal with a duration of 1s to the pulse module.

2. The method for preventing equipment from tripping due to a radar level meter failure according to claim 1 is characterized in that: The execution device includes an isolator, an analog input channel, a first switch output channel, and a second switch output channel. The analog input channel is connected to the isolator, the first switch output channel is connected to the second switch output channel, and the second switch output channel is connected to the isolator. The isolator and the second switch output channel are simultaneously connected to the level meter.

3. The method for preventing equipment from tripping due to a radar level meter failure according to claim 1 is characterized in that: The timing period of the third timing module is 10s.

4. The method for preventing equipment from tripping due to a radar level meter failure according to claim 1 is characterized in that: The t is set to 1200.

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