CN108801214A - Hydrostatic level subassembly and hydrostatic level - Google Patents

Abstract

The present invention discloses a static level, comprising an outer cylinder, an inner cylinder and a float, wherein the inner cylinder is fixedly installed in the outer cylinder and a gap is formed between the inner cylinder and the outer cylinder, the gap can contain constant temperature water so that the static level can maintain a constant temperature, the float is accommodated in the inner cylinder, the float comprises a weight pendulum and a float, the float floats in the inner cylinder, the weight pendulum is installed in the inner cylinder and naturally levels the float, the static level also comprises a distance sensor, the distance sensor is fixedly installed in the inner cylinder and measures the distance between the top plane of the float and the distance sensor in a non-contact manner so as to monitor the settlement of the object to be measured. The present invention also relates to a static level assembly comprising the above static level.

Description

A static level component and a static level

technical field

The invention relates to a detection device, in particular to a static level instrument assembly.

Background technique

The neutron spectrometer is composed of a target station, a neutron conduit, a sample stage, and a detector. The neutrons from the target station are transported to the sample stage through the neutron conduit, and the neutrons are scattered and detected by the detector after passing through the sample, so as to analyze the stress and structure of the sample. As a channel for neutron transport, the neutron conduit requires high installation accuracy. The total length of the neutron conduit is 30-50m, the installation level error does not exceed 50μm, and the uneven settlement does not exceed 0.2mm/year.

Existing static levels cannot achieve high-precision measurement.

Contents of the invention

In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a static level assembly capable of realizing high-precision measurement.

The object of the present invention adopts following technical scheme to realize:

A static level, comprising an outer cylinder, an inner cylinder and a float, the inner cylinder is fixedly installed in the outer cylinder and forms a gap with the outer cylinder, the gap can accommodate constant temperature water for the static The force level maintains a constant temperature, the float is accommodated in the inner cylinder, the float includes a weight pendulum and a float, the float floats in the inner cylinder, the weight pendulum is installed in the inner cylinder and controls the float For natural leveling, the static level also includes a distance measuring sensor, which is fixedly installed on the inner cylinder and measures the distance between the top plane of the float and the distance measuring sensor in a non-contact manner, so as to facilitate monitoring The sedimentation of the analyte.

Further, the heavy pendulum includes a base and a limit frame fixed on the base, the limit frame is provided with a limit ring, the float is located in the limit ring, and the limit ring is provided with an arc limit ring. bit to reduce friction.

Further, the inner cylinder includes a bottom plate, and the base is fixed to the bottom plate.

Further, the inner cylinder further includes a top cover and a tank wall, both ends of the tank wall are respectively fixed with the bottom plate and the top cover to form a closed space, and the float is located in the closed space.

Further, the tank wall is made of glass.

Further, the outer cylinder is provided with an air inlet, and the air inlet communicates with the enclosed space, and the enclosed space and the gas path are filled with inert gas and are in a slightly negative pressure state.

Further, the distance measuring sensor is fixed on the top cover.

Further, the ranging sensor is a laser ranging sensor.

Further, the static level further includes a temperature sensor, and the temperature sensor is installed on the inner cylinder to measure the temperature of the liquid in the inner cylinder.

A static level assembly, including a controller, a conduit and a trachea, the static level assembly also includes a static level, the controller includes a constant temperature water circulation device and an air bag, and the gap between the static level passes through the conduit and The constant temperature water circulation device is communicated to provide a constant temperature environment for the inner cylinder, and the inner cylinder is communicated with the air bag through the air tube so as to be isolated from the atmosphere and prevent inert gas volatilization and liquid loss.

Compared with the prior art, the static level assembly of the present invention has the following advantages:

(1) Using laser ranging technology, it has strong anti-interference ability, high measurement accuracy and compact structure. High-precision laser rangefinder with a measuring range of 20mm and a measuring accuracy of 2μm.

(2) The unique structural design ensures the accuracy of measurement. The floating float is used to replace the traditional guide float, which has small frictional resistance, good levelness and good vibration resistance.

(3) Real-time temperature detection. A high-precision temperature sensor is installed in each buoy with a measurement accuracy of 0.02°C. The temperature signal and the elevation signal are synchronously transmitted to the controller for processing.

(4) Temperature compensation technology. By measuring the temperature of the liquid in the static level, calculate the change of the height of each static level float affected by the temperature, and compensate the system error caused by the temperature through theoretical calculation. When the temperature difference of each static level changes less than 0.5°C, the system error affected by temperature does not exceed 8μm. After temperature compensation is adopted, the comprehensive measurement error does not exceed 10 μm, which meets the requirements of neutron beamline settlement monitoring.

(5) Special closed system, not affected by atmospheric pressure. The gas in each static level is connected to each other and then connected to the air bag, which is isolated from the atmosphere, which can effectively prevent the influence of air pressure fluctuations on the measurement system.

(6) No need to replace the measuring medium. The static level and air bag are filled with inert gas, no microorganisms will grow in the measurement medium, no dust will enter, and there is no need to replace the measurement medium.

(7) Constant temperature water circulation system. Place the static level in an environment surrounded by constant temperature water, strictly control the ambient temperature, and control the temperature difference between each level within 0.2°C. Strict temperature difference control can effectively reduce system errors caused by temperature changes.

(8) Unique horizontal adjustment method. By aligning the two measuring lines of the static level itself with the float, the liquid storage tank can be quickly adjusted to a horizontal position.

(9) Controller. The whole system is controlled by a controller, which controls the flow rate of constant temperature water according to the temperature difference and controls the temperature difference of each level. At the same time, it receives the temperature and elevation signals of each sensor, and uploads them to the central control room after processing.

Description of drawings

Fig. 1 is a perspective view of the static level assembly of the present invention;

Fig. 2 is a schematic structural view of a static level of the static level assembly of Fig. 1;

Fig. 3 is the perspective view of the float of the static level of Fig. 2;

Fig. 4 is a schematic diagram of the internal structure of the float of Fig. 3;

Fig. 5 is a schematic diagram of the use state of the static level in Fig. 2 .

In the figure: 100, static level assembly; 10, controller; 20, static level; 21, bracket; 22, outer cylinder; 220, constant temperature water inlet; 221, constant temperature water outlet; 222, reference line; 223, inlet Air port; 23, inner cylinder; 230, top cover; 231, tank wall; 232, bottom plate; 24, temperature sensor; 25, float; 250, heavy pendulum; 251, base; 252, limit frame; 2520, arc Limiting part; 253, float; 26, ranging sensor; 30, catheter; 40, trachea.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or there can also be an intervening component. When a component is said to be "connected" to another component, it may be directly connected to the other component or there may be intervening components at the same time. When a component is said to be "set on" another component, it may be set directly on the other component or there may be an intervening component at the same time. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 to FIG. 5 , a static level assembly 100 of the present invention includes a controller 10 , several static levels 20 , a conduit 30 and an air pipe 40 .

The controller 10 includes a constant temperature water circulation device, an air bag and an integrated control circuit.

Each static level 20 includes a bracket 21 , an outer cylinder 22 , an inner cylinder 23 , a temperature sensor 24 , a float 25 and a distance sensor 26 . The outer cylinder 22 is fixedly mounted on the bracket 21 . The outer cylinder 22 is provided with a constant temperature water inlet 220 , a constant temperature water outlet 221 , two reference lines 222 and an air inlet 223 . The two reference lines 222 are perpendicular to the horizontal plane. The inner barrel 23 includes a top cover 230 , a tank wall 231 and a bottom plate 232 . The tank wall 231 is made of metal, and the top cover 230 and the bottom plate 232 are made of metal. Since the coefficient of thermal expansion of glass is smaller than that of steel, the influence on the liquid level is smaller. The float 25 includes a weight pendulum 250 and a buoy 253 . The heavy pendulum 250 includes a base 251 and a limiting frame 252 . The limiting frame 252 is fixed on the base 251 . A limit ring is formed in the middle of the limit frame 252, and an arc-shaped limit portion 2520 is provided on the inner surface of the limit ring to reduce the restriction of the friction between the limit frame 252 and the float 25 to the free movement of the float 25. The range-finding sensor 26 adopts a high-precision laser range-finding sensor with a measurement accuracy of ±2 μm. The laser distance measuring sensor 26 is installed on the top cover 230, and measures the distance between the top plane of the float 25 and the laser distance measuring sensor 26 through a non-contact method. The laser ranging sensor 26 has the advantages of high measurement accuracy, fast measurement speed, and strong anti-interference ability, which can greatly improve the measurement accuracy.

The inner cylinder 23 is fixed to the outer cylinder 22 and forms a gap with the outer cylinder 22 . Through the constant temperature water inlet 220 and the constant temperature water outlet 221, the gap is filled with constant temperature water with a temperature of 22±0.1°C. When the temperature difference of each static level 20 is large, the constant temperature water circulation speed is increased, and the temperature of the static level 20 is reduced to a reasonable range. The tank wall 231, the top cover 230 and the bottom plate 232 are fixed to each other to form a closed space, and there is liquid in the closed space, the float 25 floats on the liquid, the heavy pendulum 250 is located at the bottom of the inner cylinder 23, and the float 253 is located in the limit circle of the heavy pendulum 250, The Heavy Pendulum 250 adopts a weighted bottom structure, similar to a tumbler. The float 25 floats on the liquid surface, and the heavy pendulum 250 at the bottom plays a role of natural leveling, preventing the upper surface of the float 253 from tilting when the laser distance measuring sensor 26 measures the distance. The fixing method of the limit frame 252 is adopted to limit the movement of the buoy 253 in the horizontal direction. The closed space communicates with the air inlet 223 . The temperature sensor 24 is fixed in the inner cylinder 23 and adopts an intrusive high-precision sensor with a measurement accuracy of 0.02°C.

When assembling the static level assembly 100 , each static level 20 communicates with the constant temperature water circulation device of the controller 10 through the conduit 30 . The constant temperature water provides a constant temperature environment for the inner cylinder 23 to ensure that the temperatures of the static levels 20 are consistent. The controller 10 outputs constant temperature water with a temperature of 22±0.1° C. through the internal constant temperature control system. When the temperature differences of the static levels 20 are large, the constant temperature water circulation speed is increased to reduce the temperature of the static levels 20 to a reasonable range. Each static level 20 communicates with the air bag through a trachea 40 . The entire gas pipeline and air bag are filled with inert gas, under a slight negative pressure state. The gas in the airbag is isolated from the atmosphere, which can effectively prevent the loss of inert gas and liquid evaporation inside the system, so there is no need to replenish liquid for long-term use. The airbag is arranged in the controller 10, and the gas pressure in the airbag is measured by a pressure sensor to ensure that it is equal to the atmospheric pressure.

The static levels 20 are equidistantly arranged along the neutron beamline, and the distance between each section is 5m. The controller 10 is arranged in the middle of the pipeline, and each pipeline adopts a thermal insulation structure, which can effectively reduce the temperature change caused by the liquid flowing in the conduit 30, and reduce the local measurement error caused by the uneven gas pressure.

The system can arrange a static level 20 at the permanent leveling point of the building, and then arrange the static level 20 at other measurement positions as required. By comparing the elevation difference between the permanent leveling point and the static level 20 at other locations, the settlement of each location can be calculated. If only relative settlement is measured, the static level 20 may not be arranged at the permanent leveling point. The static level 20 is suitable for places where the measurement range is within 100m, the elevation difference is not more than 20mm, and the ambient temperature does not change drastically.

In order to ensure a certain levelness of the static level 20 itself, a unique leveling method is adopted. The self-contained float 253 is used for leveling, saving time and effort. During leveling, it is only necessary to align the two vertical reference lines 222 arranged at 90° with the float 253 on the outer cylinder 22 wall of the static level 20 .

The control system collects the elevation signal and the temperature signal in each static level 20, and after compensation and correction, displays it in real time on the display screen. The control system uses a small PLC to collect and process information, collects signals 20 times per minute, and then takes the average value to calculate the elevation change. The controller 10 has the ability to communicate with the upper control system, and can upload the neutron beam line settlement situation to the central control room in time, which is convenient for maintenance personnel to monitor and adjust.

The static level assembly of the present invention has the following advantages:

(1) Using laser ranging technology, it has strong anti-interference ability, high measurement accuracy and compact structure. High-precision laser rangefinder with a measuring range of 20mm and a measuring accuracy of 2μm.

(2) The unique structural design ensures the accuracy of measurement. The floating float 25 is used to replace the traditional guide float, which has small frictional resistance, good levelness and good vibration resistance.

(3) For real-time temperature detection, a high-precision temperature sensor 24 is installed in each buoy with a measurement accuracy of 0.02°C. The temperature signal and the elevation signal are synchronously transmitted to the controller 10 for processing.

(4) Temperature compensation technology, by measuring the liquid temperature in the static level 20, calculating the change of the height of the float 25 of each static level 20 affected by the temperature, and compensating the system error caused by the temperature through theoretical calculation. When the temperature difference of each static level 20 changes less than 0.5°C, the system error affected by temperature does not exceed 8 μm. After temperature compensation is adopted, the comprehensive measurement error does not exceed 10 μm, which meets the requirements of neutron beamline settlement monitoring.

(5) Special closed system, not affected by atmospheric pressure. The gas in each static level 20 is connected to each other and then connected to the air bag, which is isolated from the atmosphere, which can effectively prevent the influence of air pressure fluctuations on the measurement system.

(6) No need to replace the measuring medium. The static level 20 and the air bag are filled with inert gas, no microorganisms will grow in the measurement medium, no dust will enter, and there is no need to replace the measurement medium.

(7) Constant temperature water circulation system. Place the static levels 20 in an environment surrounded by constant temperature water, strictly control the ambient temperature, and control the temperature difference between the static levels 20 within 0.2°C. Strict temperature difference control can effectively reduce system errors caused by temperature changes.

(8) Unique horizontal adjustment method. By aligning the two reference lines 222 of the static level 20 with the float 25, the liquid storage tank can be quickly adjusted to a horizontal position.

(9) Control device. The whole system is controlled by a controller 10, and the controller 10 controls the flow rate of the constant temperature water according to the temperature difference, and controls the temperature difference of each static level 20. At the same time, it receives the temperature and elevation signals of each sensor, and uploads them to the central control room after processing.

Those skilled in the art can make various other corresponding changes and deformations according to the above-described technical solutions and concepts, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims (10)

1. A static level, comprising an outer cylinder, an inner cylinder and a float, characterized in that: the inner cylinder is fixedly installed in the outer cylinder and forms a gap with the outer cylinder, and the gap can accommodate a constant temperature The water is used to maintain a constant temperature for the static level, the float is accommodated in the inner cylinder, the float includes a weight pendulum and a float, the float floats in the inner cylinder, and the weight pendulum is installed in the inner cylinder and naturally level the buoy, the static level also includes a distance measuring sensor, the distance measuring sensor is fixedly installed in the inner cylinder and measures the top plane of the float and the distance measuring sensor in a non-contact manner distance in order to monitor the settlement of the analyte. 2. The static level according to claim 1, characterized in that: the heavy pendulum includes a base and a limit frame fixed on the base, the limit frame is provided with a limit ring, and the float is positioned at the limit frame. In the spacer ring, the spacer ring is provided with an arc-shaped spacer to reduce friction. 3. The static level according to claim 2, wherein the inner cylinder comprises a bottom plate, and the base is fixed to the bottom plate. 4. The static level according to claim 3, characterized in that: the inner cylinder also includes a top cover and a tank wall, and the two ends of the tank wall are respectively fixed with the bottom plate and the top cover to form a closed space , the float is located in the confined space. 5. The static level according to claim 4, wherein the tank wall is made of glass. 6. The static level according to claim 4, characterized in that: the outer cylinder is provided with an air inlet, the air inlet communicates with the enclosed space, and the enclosed space and the gas path are filled with inert gas , in a slightly negative pressure state. 7. The static level according to claim 4, wherein the distance measuring sensor is fixed on the top cover. 8. The static level according to any one of claims 1-7, wherein the distance measuring sensor is a laser distance measuring sensor. 9. The static level according to any one of claims 1-7, characterized in that: the static level also includes a temperature sensor, the temperature sensor is installed in the inner cylinder to measure the temperature of the liquid in the inner cylinder temperature. 10. A static level assembly, comprising a controller, a conduit and a trachea, characterized in that: the static level assembly also includes several static levels as claimed in any one of claims 1-9, and the controller It includes a constant temperature water circulation device and an air bag, and the gap of the static level communicates with the constant temperature water circulation device through the catheter to provide a constant temperature environment for the inner cylinder, and the inner cylinder communicates with the air bag through the air tube, so that It is isolated from the atmosphere to prevent inert gas volatilization and liquid loss.