CN111256782B - A measuring servo level gauge for oil tank - Google Patents

Abstract

The invention relates to the technical field of liquid level measurement, and discloses a measurement servo liquid level gauge for oil tanks, comprising an oil tank and a vertical steel pipe, the vertical steel pipe is vertically and fixedly installed inside the oil tank, and the oil The inside of the tank is filled with a large amount of oil, the oil is not filled with the oil tank, and the vertical steel pipe is provided with evenly distributed through holes. Through the setting of the movable float and the signal receiver, the laser sensor can measure the distance from the surface of the oil to the top of the tank in real time, and transmit the signal to the outside world, and the laser sensor can measure the length within a few meters, and its accuracy can reach. Micron, which greatly improves the measurement accuracy of the liquid level gauge, and through the setting of two sets of laser sensors on the movable float, the measurement accuracy of the liquid level gauge is further improved by measuring the two sets of data at the same time and taking the average value, while effectively preventing oil The liquid level fluctuation caused by the oil in and out of the tank drives the signal receiver to shake, thereby reducing the error of the liquid level measurement.

Description

A measuring servo level gauge for oil tank

technical field

The invention relates to the technical field of liquid level measurement, in particular to a measurement servo liquid level gauge for oil tanks.

Background technique

At present, most of the oil tanks and spherical tanks in domestic refineries use the following instrument level gauges: float steel belt level gauge, static pressure/differential pressure level gauge, servo level gauge, radar level gauge, among which servo level gauge It is generally composed of a stepping motor, a magnetic coupling disc, a hub, a steel wire, a float, a force sensor and the corresponding electronic circuit. It can move up and down, and the moment generated by the gravity of the float reacts on the force sensor. Since the buoyancy of the float in different density media is different, the reaction force on the force sensor is also different. Therefore, by measuring the size of the reaction force, the position of the float can be determined. In the air, liquid level (liquid level position) or interface (liquid interface), the actual position of the float is obtained by measuring the number of steps of the stepper motor, but there are some shortcomings, as follows:

The servo level gauge relies on the threaded groove on the hub, and the steel wire enters the threaded groove and is positioned by its thread. Every step of the stepper motor, the moving distance of the float must be exactly the same, otherwise errors will occur. Therefore, the servo level The machining accuracy of the wheel hub, the stepping motor and the corresponding transmission mechanism is very high, which makes the processing cost very high. At the same time, the stepper motor makes the float move up and down by about 10mm for each revolution of the stepping motor, and each revolution is divided into 200 steps, so each step is divided into 200 steps. Equivalent to 0.05mm, which greatly limits the measurement accuracy of the level gauge, and the servo level gauge needs to change the reaction force applied to the float through the force sensor for the oil level and the oil-water separation height to make the float in the oil. It is impossible to detect the online heights of the two in real time at the same time, and it is impossible to provide timely information on the oil in the tank.

SUMMARY OF THE INVENTION

The present invention provides a measuring servo level gauge for oil tanks, which has the advantages of separately measuring oil height and oil-water separation height, and measuring oil height with high precision, and solves the above-mentioned problems in the background art.

The present invention provides the following technical solutions: a measuring servo level gauge for an oil tank, comprising an oil tank and a vertical steel pipe, the vertical steel pipe is vertically and fixedly installed inside the oil tank, and the inside of the oil tank is filled with A large amount of oil, the oil does not fill the oil tank, the vertical steel pipe is provided with evenly distributed through holes, the vertical steel pipe is sleeved with a movable float inside the oil tank, the oil tank A signal receiver is fixedly installed on the upper surface of the oil tank, a liquid level gauge casing is fixedly installed on the upper surface of the oil tank and is just above the vertical steel pipe, and a CPU is fixedly installed on the inner right side of the liquid level gauge casing. A servo motor is fixedly installed inside the shell of the liquid level gauge and located on the left side of the CPU, the left end of the servo motor is fixedly connected with a wheel hub, a Hall sensor is fixedly installed inside the wheel hub, and a traction belt is wound around the wheel hub, A traction float is fixedly connected to the bottom end of the traction belt, a contact exciter is fixedly installed on the liquid level gauge shell and located directly under the hub, the traction belt is movably clamped with the contact exciter, and the contact A counter is fixedly connected to the right end of the point exciter.

Preferably, two movable grooves are opened on the vertical steel pipe, the movable float includes a floating body and a laser sensor, the floating body is movably connected to the movable groove, and the buoyancy of the floating body in the oil is greater than the gravity of the floating body and the laser sensor. And, there are two laser sensors, which are respectively uniformly and symmetrically installed on the upper surface of the floating body.

Preferably, the traction belt is divided into two parts, respectively a trigger section and a connection section, the trigger section is located at the upper part and is composed of a steel belt, and one side of the steel belt is provided with hollow trapezoidal protrusions distributed in an array, The hollow trapezoidal protrusion is movably clamped to the contact exciter, one end of the triggering section is fixedly connected to the wheel hub, the connecting section is located at the bottom and is composed of steel wires, and the bottom end of the connecting section is fixedly connected to the traction float .

Preferably, the contact trigger includes a fixed clip body, a movable rod is movably clamped in the middle of the fixed clip body, and contacts are respectively fixedly installed on the upper surface and bottom surface of the right end of the movable rod, and the fixed clip body A rising contact is fixedly installed on the bottom surface of the interior, and a descending contact is fixedly installed on the upper surface of the interior of the fixed clip body.

Preferably, the gravity of the traction float minus the traction force of the traction belt on the traction float is greater than the buoyancy of the oil on the traction float and less than the buoyancy of the water on the traction float.

The present invention has the following beneficial effects:

1. Through the setting of the movable float and the signal receiver, the laser sensor can measure the distance from the surface of the oil to the top of the tank in real time, and transmit the signal to the outside world, while the laser sensor measures the length within a few meters, and its accuracy can be The measurement accuracy of the liquid level gauge is greatly improved, and through the setting of two sets of laser sensors on the movable float, the average value of the two sets of data is measured at the same time, which further improves the measurement accuracy of the liquid level gauge, and at the same time effectively It prevents the liquid level fluctuation caused by the oil entering and leaving the oil tank and drives the signal receiver to shake, thereby reducing the error of the liquid level measurement.

2. Through the setting of the movable float and the traction float, the oil level in the oil tank and the oil-water separation level can be monitored online at the same time, so as to ensure the safety of the oil in the oil tank when it is used, and prevent the excessive extraction of oil from causing A large amount of separated water is extracted, which affects the safety of use of external instruments.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the enlarged schematic diagram of C at the structure of the present invention in Fig. 1;

3 is a schematic side view of the installation of the traction belt and the counter of the structure of the present invention;

FIG. 4 is a schematic top view of the installation of the vertical steel pipe and the movable float of the structure of the present invention;

FIG. 5 is a schematic diagram of the structure control of the present invention.

In the figure: 1, oil tank; 2, vertical steel pipe; 3, movable float; 31, floating body; 32, laser sensor; 4, signal receiver; 5, liquid level gauge shell; 6, CPU; 7, servo motor; 8, wheel hub; 9, traction belt; 10, contact trigger; 101, fixed clip body; 102, movable rod; 103, rising contact; 104, descending contact; 11, counter; 12, traction float; A, Oil level; B. Oil-water separation level.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Figure 1-5, a measuring servo level gauge for oil tank, including oil tank 1 and vertical steel pipe 2, the vertical steel pipe 2 is vertically fixed and installed inside the oil tank 1, and the inside of the oil tank 1 is filled with There is a large amount of oil, and the oil is not full of the oil tank 1. The vertical steel pipe 2 is provided with evenly distributed through holes, which can allow the oil to enter the interior of the vertical steel pipe 2. The vertical steel pipe 2 is located on the oil tank 1. A movable float 3 is sleeved inside, a signal receiver 4 is fixedly installed on the upper surface of the oil tank 1, and a liquid level gauge shell 5 is fixedly installed on the upper surface of the oil tank 1 and is directly above the vertical steel pipe 2, and the liquid level gauge shell The CPU6 is fixedly installed on the inner right side of the 5, the inside of the liquid level gauge housing 5 and located on the left side of the CPU6 is fixedly installed with a servo motor 7, and the left end of the servo motor 7 is fixedly connected with a hub 8, and the inside of the hub is fixedly installed with a hoist. Er sensor, a traction belt 9 is wound on the wheel hub 8, the bottom end of the traction belt 9 is fixedly connected with a traction float 12, and a contact exciter 10 is fixedly installed on the liquid level gauge shell 5 and located directly under the wheel hub 8, and the traction belt 9 The counter 11 is fixedly connected to the right end of the contact trigger 10 , which is movably clipped with the contact trigger 10 .

The vertical steel pipe 2 is provided with two movable grooves, and the movable float 3 includes a floating body 31 and a laser sensor 32. The floating body 31 is movably connected to the movable groove, so that the movable float 3 can rise and fall with the rise and fall of the oil level, reducing the The shaking of the movable float 3 increases the precise value measured by the laser sensor 32. The buoyancy of the floating body 31 in the oil is greater than the gravitational sum of the floating body 31 and the laser sensor 32, so that the movable float 3 always floats on the oil surface. The height of the liquid level is detected in real time. There are two laser sensors 32, which are uniformly and symmetrically installed on the upper surface of the floating body 31. It can effectively prevent the liquid level fluctuation caused by the in and out of the oil tank and drive the signal receiver 4 to shake, thereby reducing the error of the liquid level measurement.

Among them, the traction belt 9 is divided into two parts, namely the trigger section and the connection section. The trigger section is located at the upper part and is composed of a steel belt. One side of the steel belt is provided with hollow trapezoidal protrusions distributed in an array. The point trigger 10 is movably clamped, and one end of the trigger segment is fixedly connected with the wheel hub 8, which can be wound on the wheel hub 8, and the hollow protrusions can be superimposed to reduce the thickness when winding on the wheel hub 8, and the connecting segment is located at the lower part, The bottom end of the connection section is fixedly connected with the traction float 12, which is used to connect the traction float 12 and the trigger section, reduce the winding thickness of the traction belt 9 on the hub 8, and reduce the traction float 12 in the oil. Running resistance.

The contact trigger 10 includes a fixed clip body 101 , a movable rod 102 is movably clamped in the middle of the fixed clip body 101 , contacts are fixedly installed on the upper surface and bottom surface of the right end of the movable rod 102 , and the bottom surface inside the fixed clip body 101 is fixedly installed. A rising contact 103 is fixedly installed, and a descending contact 104 is fixedly installed on the upper surface of the fixed clip body 101. When the traction float 12 moves up and down with the height of the oil-water separation liquid level, the force of the traction belt 9 on the hub 8 changes, And then transmit to CPU6 through the Hall sensor of wheel hub 8, and drive wheel hub 8 to start to rotate through CPU6 triggering servo motor 7, and tractor belt 9 is gathered, so that tractor belt 9 contacts with contact exciter 10, triggers the contact point, And make the counter 11 start counting, so as to judge the change of the oil-water level.

Wherein, the gravity of the traction float 12 minus the traction force of the traction belt 9 on the traction float 12 is greater than the buoyancy of the oil on the traction float 12 and less than the buoyancy of the water on the traction float 12, so that the traction float 12 is just at the oil-water separation liquid level.

Working principle, oil level measurement: use the movable float 3 to be sleeved on the outside of the vertical steel pipe 2, and use its buoyancy to float on the surface of the oil, and vertically lift with the rise and fall of the oil level. The laser sensor installed on it measures the distance to the top of the oil tank, and then detects the height of the oil level, and then the sensor transmits the signal to the signal receiver 4, and the signal receiver 4 transmits the signal to the CPU6, that is, the oil level is completed. face height measurement;

Measurement of the oil-water separation liquid level: put the traction float 12 into the vertical steel pipe 2 and sink it into the oil, at the oil-water separation place, pulled by the traction belt 9, when the oil-water separation liquid level rises, the traction float 12 is driven With the traction belt 9 floating up, the force on the hub 8 is reduced, the Hall sensor detects the change in the force, and transmits the signal to the CPU6, and the CPU6 triggers the servo motor 7 to drive the hub 8 to start to rotate, and the traction belt 9 starts to rotate. After closing, the traction belt 9 is brought into contact with the contact exciter 10, the contact is triggered, and the counter 11 starts to count, so as to judge the change of the oil-water level.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. The utility model provides a measure servo level gauge for oil tank, includes oil tank (1) and vertical steel pipe (2), vertical steel pipe (2) vertical fixation installs in the inside of oil tank (1), the inside of oil tank (1) is filled with a large amount of fluid, fluid is not full of oil tank (1), its characterized in that: the steel tank is characterized in that uniformly distributed through holes are formed in the vertical steel pipe (2), the movable floater (3) is sleeved in the vertical steel pipe (2) and located in the oil tank (1), the signal receiver (4) is fixedly arranged on the upper surface of the oil tank (1), a liquid level meter shell (5) is fixedly arranged on the upper surface of the oil tank (1) and right above the vertical steel pipe (2), a CPU (6) is fixedly arranged on the right side of the interior of the liquid level meter shell (5), a servo motor (7) is fixedly arranged on the left side of the CPU (6) in the interior of the liquid level meter shell (5), a hub (8) is fixedly connected with the left end of the servo motor (7), a Hall sensor is fixedly arranged in the interior of the hub (8), a traction belt (9) is wound on the hub (8), and a traction floater (12) is fixedly connected with the bottom end of the traction belt (9, the liquid level meter is characterized in that a contact exciter (10) is fixedly mounted on the liquid level meter shell (5) and is located under the wheel hub (8), the traction belt (9) is movably clamped with the contact exciter (10), and the right end of the contact exciter (10) is fixedly connected with a counter (11).

2. A measuring servo level gauge for a tank, according to claim 1, characterized in that: two movable grooves are formed in the vertical steel pipe (2), the movable floater (3) comprises a floating body (31) and a laser sensor (32), the floating body (31) is movably clamped with the movable grooves, the buoyancy of the floating body (31) in oil is larger than the sum of the gravity of the floating body (31) and the gravity of the laser sensor (32), and the two laser sensors (32) are respectively and uniformly and symmetrically fixedly installed on the upper surface of the floating body (31).

3. A measuring servo level gauge for a tank, according to claim 1, characterized in that: traction belt (9) divide into two parts and are trigger section and linkage segment respectively, trigger the section and lie in upper portion, and constitute by the steel band, hollow trapezoidal arch that is the array distribution is seted up to one side of steel band, hollow trapezoidal arch and contact energizer (10) activity joint, the one end and wheel hub (8) fixed connection of trigger the section, the linkage segment is located the lower part, and comprises the steel wire, the bottom of linkage segment with pull float (12) fixed connection.

4. A measuring servo level gauge for a tank, according to claim 1, characterized in that: contact energizer (10) are including the fixed clamp body (101), the middle part activity joint of the fixed clamp body (101) has movable rod (102), the right-hand member upper surface and the bottom surface of movable rod (102) respectively fixed mounting have the contact, the inside bottom surface fixed mounting of fixed clamp body (101) has ascending contact (103), the inside last fixed surface of fixed clamp body (101) installs descending contact (104).

5. A measuring servo level gauge for a tank, according to claim 1, characterized in that: the gravity of the traction floater (12) minus the traction force of the traction belt (9) on the traction floater (12) is larger than the buoyancy of the oil liquid on the traction floater (12) and smaller than the buoyancy of the water on the traction floater (12).

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