A static level gauge with scale displacement sensor

Abstract

The present invention relates to a static level gauge with a scale displacement sensor. A measuring tube (8) is fixedly arranged on a reference pier (1) and a monitoring pier (18), respectively. A bracket (10) is fixed on the inner wall of the measuring tube (8), a reading head (7) is arranged at the end of the fixed bracket (10), a spherical scale (6) is inserted into the reading head (7), a floating body (12) is fixedly installed at the lower end of the spherical scale (6), a controller (2) is arranged on the reference pier (1), each reading head (7) is connected to the controller (2) through a cable (11), an air connecting pipe (9) connects each measuring tube (8) together through a hole, a hole is opened on the bottom plate (5) of each measuring tube (8) and connected to a liquid connecting pipe (13), and a control valve (15) and a liquid injection port (16) are arranged at the end of the liquid connecting pipe (13). The present invention has high precision, stability and reliability, low price, and good application prospects.

Description

Technical Field

[0001] The present invention belongs to the field of measurement technology, and in particular relates to a static level with a scale displacement sensor, which can be used to measure vertical displacement, and can be used to accurately and real-time measure the vertical displacement of various buildings and equipment, and can be used to measure the vertical displacement of buildings such as dams, sluice gates, roads, bridges, tunnels, large equipment foundations, slopes, etc. Background Art

[0002] The static leveling method is often used for vertical displacement measurement. Its basic principle is to use the equal potential energy of the connected liquid, that is, the equal liquid level elevation, to achieve the measurement of vertical displacement. The principle of this method is clear. Combined with modern displacement sensing technology, it can achieve high accuracy, and can monitor the displacement in real time and continuously monitor the vertical displacement changes of the object. The commonly used static levels are classified according to the measurement method, including manual measurement, laser measurement, magnetostrictive measurement, pressure sensor measurement and other forms. Among them, the manual measurement type is gradually eliminated due to large errors and high labor intensity. Pressure sensors are prone to failure due to rust and other reasons because they are in direct contact with water, and their accuracy is low and they are rarely used. The laser measurement method is because the core component, the high-precision laser displacement sensor, is not yet mature in my country, and most of it is currently imported, so the price is high; the magnetostrictive type is greatly affected by the external environment, so its promotion and application are limited. Summary of the invention

[0003] In order to provide a stable, reliable, high-precision, reasonably priced, and fully independent intellectual property static level, a scale static level was developed after experiments. The so-called scale refers to bars that are evenly arranged at a certain interval on the measurement path in different ways, such as magnetic gratings, capacitive gratings, gratings or spherical gratings. These bars can be inductively positioned by different methods to achieve displacement measurement; or sensitive objects of the same size (generally small size) are installed on the measurement path for inductive measurement. For example, a spherical scale is a small metal ball of the same diameter installed in a tube as a sensing object to achieve displacement measurement. The purpose of the present invention is to provide a scale static level, including a spherical scale, a magnetic scale, a grating scale, a capacitive scale, etc.; it can reduce the cost while ensuring high accuracy, and fully realize domestic production using my country's existing technology. The following description takes a spherical scale as an example. The technical solution adopted to realize the invention is as follows: a static level of a scale displacement sensor, characterized in that: the level is provided with a reference pier and a monitoring pier, the reference pier is used as a fixed reference point, the monitoring pier is used as a monitoring point, measuring tubes are fixedly arranged on the reference pier and the monitoring pier respectively, the internal structure of each measuring tube is the same, a fixed bracket is welded at the middle part of the height of the inner wall of the measuring tube, a reading head is arranged at the end of the fixed bracket, the reading head is in a circular ring shape, so that the center of the circular ring coincides with the axis of the measuring tube; a spherical scale is installed in the reading head, a floating body is fixedly installed at the lower end of the spherical scale, and the measuring tube is fixedly arranged on the measuring tube. An upper cover is provided on the cylinder, the measuring cylinder and the upper cover are threadedly connected, a bottom plate is provided on the bottom surface of the measuring cylinder, a controller is provided on the reference pier, each reading head is connected to the controller through a cable, provides power and transmits the measured data to the controller, holes are provided on the cylinder wall at the upper part of the measuring cylinder, the air connecting pipe connects each measuring cylinder together through the holes, connects the parts above the liquid level in the measuring cylinder installed at the reference point and the monitoring point, so that the air pressure at the upper part is equal, a hole is opened on the bottom plate of each measuring cylinder and connected to the liquid connecting pipe, and a control valve and a liquid injection port are provided at the end of the liquid connecting pipe. Three fixing bolts are pre-buried in the reference pier and the monitoring pier, and three holes are evenly arranged at the edge of the relative bottom plate, the fixing bolts are inserted in the bottom plate holes, and the measuring cylinder is fixed to the reference pier and the monitoring pier by using a leveling nut and a compression nut.

[0004] Measuring points are set at the parts of the measured building or equipment where vertical displacement needs to be measured. There can be multiple measuring points, and base points are set on stable strata near the building. Monitoring piers are set at the base points and measuring points. The monitoring piers are generally made of concrete, and the installation elevations of each measuring cylinder are basically equal. The measuring cylinders are connected by pipes, and liquid is added to the measuring cylinders. The liquid level is approximately in the middle of the height of the measuring cylinder. A float is set on the liquid surface in the cylinder, and a cylindrical spherical scale is vertically installed on the float. The buoyancy generated by the float is greater than the sum of the gravity of the float and the spherical scale. A horizontal bracket is welded in the middle of the measuring cylinder, and a reading head is installed at the end of the bracket. The reading head is annular, and the center of the circle coincides with the axis of the measuring cylinder. The spherical scale passes through the annular reading head. The reading head is connected to the controller through a cable, and the cable transmits measurement data and supplies power.

[0005] A hole is provided on the top wall of the measuring cylinder and connected to a vent pipe to connect all the upper air chambers of the measuring cylinders so that the air pressure on the upper parts of all the measuring cylinders is equal.

[0006] During measurement, the base point does not move, and the settlement of the measuring point is set to y1. At this time, the liquid level at the base point drops by x0 relative to the cylinder, driving the float and the spherical scale above to also drop by x0. This value is measured by the reading head at the base point and transmitted to the controller; the liquid level at the measuring point rises by x1 relative to the cylinder, and this value is measured by the reading head at the measuring point at the same time and transmitted to the controller. From the geometric relationship, it can be seen that: y1= x0+x1.

[0007] According to the design requirements, multiple measuring points are set, and the calculation formula for the vertical displacement of the nth measuring point is: n =x0+x n

[0008] in:

[0009] y n ——vertical displacement produced by the nth measuring point;

[0010] x0——the rise and fall of the liquid level in the base point measuring cylinder relative to its own cylinder body, measured by the reading head at the base point;

[0011] x n ——The rise and fall of the liquid level in the measuring cylinder relative to the cylinder body at the nth measuring point is measured by the reading head at the measuring point at the same time;

[0012] It is also stipulated that the increase is negative and the decrease is positive.

[0013] The invention has high precision, stability and reliability, low price and good application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] In the figure: 1. reference pier; 2. controller; 3. leveling nut; 4. clamping nut; 5. base plate; 6. spherical scale; 7. reading head; 8. measuring tube; 9. gas connecting pipe; 10. fixing bracket; 11. cable; 12. float; 13. liquid connecting pipe; 14. fixing bolt; 15. control valve; 16. liquid filling port; 17. upper cover; 18. monitoring pier. DETAILED DESCRIPTION

[0016] The present invention can be implemented by using a spherical scale, a magnetic scale, a grating scale, or a capacitive scale; a spherical scale is now used as an example for explanation.

[0017] Referring to the attached drawings, a static leveling instrument with a scale displacement sensor is characterized in that: the leveling instrument is provided with a reference pier 1 and a monitoring pier 18, the reference pier 1 is used as a fixed reference point, the monitoring pier 18 is used as a monitoring point, a measuring tube 8 is fixedly arranged on the reference pier 1 and the monitoring pier 18, respectively, the internal structure of each measuring tube 8 is the same, a fixing bracket 10 is welded at the middle part of the inner wall height of the measuring tube 8, a reading head 7 is arranged at the end of the fixing bracket 10, the reading head 7 is in a circular ring shape, so that the center of the circular ring coincides with the axis of the measuring tube 8; a spherical scale 6 is installed in the reading head 7, a floating body 12 is fixedly installed at the lower end of the spherical scale 6, and an upper cover 17 is arranged on the measuring tube 8 The measuring cylinder 8 and the upper cover 17 are threadedly connected. The bottom surface of the measuring cylinder 8 is provided with a bottom plate 5. The reference pier 1 is provided with a controller 2. Each reading head 7 is connected to the controller 2 through a cable 11 to provide power and transmit the measured data to the controller 2. Holes are provided on the upper wall of the measuring cylinder 8. The gas connecting pipe 9 connects each measuring cylinder 8 through the hole, and connects the parts above the liquid level in the measuring cylinder installed at the reference point and the monitoring point, so that the upper air pressure is equal. A hole is opened on the bottom plate 5 of each measuring cylinder 8 and connected to the liquid connecting pipe 13. The end of the liquid connecting pipe 13 is provided with a control valve 15 and a liquid injection port 16. Three first fixing bolts 14 are pre-buried in the reference pier 1 and the monitoring pier 18, respectively. Three holes are evenly arranged on the edge of the bottom plate 5. The fixing bolts 14 are inserted in the holes of the bottom plate 5. The measuring cylinder 8 is fixed to the reference pier 1 and the monitoring pier 18 by using the leveling nut 3 and the clamping nut 4. The installation elevations of the measuring cylinders 8 are basically equal. The monitoring pier 18 can be provided in plurality according to design requirements.

[0018] At a stable point near the building or equipment to be measured, a reference pier is set as a fixed reference point; at the location where vertical displacement needs to be detected, a similar monitoring pier is set as a monitoring point. The monitoring pier is usually made of concrete, and multiple monitoring piers can be set according to design requirements.

[0019] After installation, open the control valve 15 and add liquid through the liquid injection port 16 to make the liquid level in the measuring cylinder installed at the reference point and the monitoring point at the appropriate position. When the monitoring point produces vertical displacement, the ball scale in the reference point and the monitoring point can measure the change of the liquid level in each measuring cylinder relative to the cylinder body, and send the data to the controller 2. The controller 2 has a built-in calculation program to calculate the change in vertical displacement of each measuring point at any time. The controller 2 can transmit the data back to the control center computer by wire or wireless means for the use of management personnel.

Claims

1. A scale displacement sensor static level, characterized in that: The level instrument is provided with a reference pier (1) and a monitoring pier (18), the reference pier (1) being a fixed reference point, the monitoring pier (18) being a monitoring point, measuring tubes (8) being fixedly arranged on the reference pier (1) and the monitoring pier (18), respectively, the internal structure of each measuring tube (8) being the same, a fixing bracket (10) being welded at the middle portion of the inner wall height of the measuring tube (8), a reading head (7) being provided at the end of the fixing bracket (10), the reading head (7) being in a circular ring shape, a spherical scale (6) being inserted into the reading head (7), a floating body (12) being fixedly installed at the lower end of the spherical scale (6), an upper cover (17) being provided on the measuring tube (8), and a bottom surface of the measuring tube (8) being provided with a A base plate (5) is provided, and a controller (2) is provided on the reference pier (1). Each reading head (7) is connected to the controller (2) through a cable (11) to provide power and transmit measured data to the controller (2). Holes are provided on the upper wall of the measuring cylinder (8). An air communication pipe (9) connects the measuring cylinders (8) together through the holes, and connects the parts above the liquid surface in the measuring cylinders installed at the reference point and the monitoring point, so that the air pressure in the upper part is equal. A hole is opened on the base plate (5) of each measuring cylinder (8) and is connected to a liquid communication pipe (13). A control valve (15) and a liquid injection port (16) are provided at the end of the liquid communication pipe (13).

2. The scale displacement sensor static level according to claim 1, characterized in that: The reference pier (1) and the monitoring pier (18) are respectively pre-buried with three fixing bolts (14), and three holes are respectively evenly arranged at the edge of the base plate (5). The fixing bolts (14) are inserted into the holes of the base plate (5), and the measuring tube (8) is fixed to the reference pier (1) and the monitoring pier (18) by using a leveling nut (3) and a clamping nut (4).

3. The scale displacement sensor static level according to claim 1, characterized in that: The installation heights of the measuring cylinders (8) are substantially equal.

4. The scale displacement sensor static level according to claim 1, characterized in that: The center of the circular ring of the reading head (7) coincides with the axis of the measuring cylinder (8).

5. The scale displacement sensor static level according to claim 1, characterized in that: The measuring tube (8) and the upper cover (17) are threadedly connected.

6. The scale displacement sensor static level according to claim 1, characterized in that: A plurality of monitoring piers (18) may be provided according to design requirements.

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