阅读说明：本技术 一种水利工程测压管用跟随式磁致伸缩水位计 (Following type magnetostrictive water level gauge for hydraulic engineering pressure measuring pipe ) 是由 张大鸿 田志刚 宋厚源 郭鹏 王传荣 陈衍德 于 2020-06-15 设计创作，主要内容包括：本发明涉及一种水利工程测压管用跟随式磁致伸缩水位计,其特征在于：底盘(8)上安装有主支架(10)和副支架(14),主支架(10)上安装有绕线辊筒(9)、伺服电机(11)、滑动接头(17)；副支架(14)上安装有滑轮(15),控制器(13)固定在底盘(8)上,控制器(13)通过信号线连接伺服电机(11)、计数器(12)及磁致伸缩仪上的线缆(5),线缆(5)是通过滑动接头(17)转接后连接到控制器(13),线缆(5)连接到磁致伸缩仪的波导杆(2)顶部的信号转换器(4)上,波导杆(2)上设有磁性浮体(3),可随着井内水位升降。本发明使用磁致伸缩测量和伺服机构组合使用,解决了小直径测压管液位测量的问题。(The invention relates to a following magnetostrictive water level gauge for a hydraulic engineering pressure measuring tube, which is characterized in that: a main bracket (10) and an auxiliary bracket (14) are arranged on the chassis (8), and a winding roller (9), a servo motor (11) and a sliding joint (17) are arranged on the main bracket (10); install pulley (15) on assistant support (14), controller (13) are fixed on chassis (8), cable (5) on servo motor (11), counter (12) and the magnetostrictive instrument are connected through signal line in controller (13), cable (5) are connected to controller (13) through sliding joint (17) switching back, on cable (5) are connected to signal converter (4) at the waveguide bar (2) top of magnetostrictive instrument, be equipped with magnetic float (3) on waveguide bar (2), can go up and down along with the water level in the well. The invention uses the combination of magnetostriction measurement and a servo mechanism to solve the problem of liquid level measurement of the small-diameter piezometer tube.)

1. The utility model provides a following magnetostrictive water level gauge for hydraulic engineering manometric tube, includes manometric tube (6), its characterized in that: a pipe orifice cover plate (7) is arranged at the position of a pipe orifice of a dam pressure measuring pipe (6), a hole (18) is formed in the pipe orifice cover plate (7), a chassis (8) of a servo mechanism is fixed on the pipe orifice cover plate (7), a main support (10) and an auxiliary support (14) are arranged on the chassis (8), and a winding roller (9), a servo motor (11) and a sliding joint (17) are arranged on the main support (10); install pulley (15) on assistant support (14), correspond pulley (15) installation counter (12), controller (13) are fixed on chassis (8), servo motor (11) is connected through the signal line in controller (13), cable (5) on counter (12) and the magnetostrictive instrument, be connected to controller (13) after cable (5) are through sliding joint (17) switching, hole (18) on cable (5) through pipe orifice apron (7) enter into pressure-measuring pipe (6), be connected to the magnetostrictive instrument on wave guide pole (2) signal converter (4) at the top, be equipped with magnetic body (3) on wave guide pole (2), can go up and down along with the well water level.

2. The following magnetostrictive water level gauge for the hydraulic engineering pressure measuring pipe according to claim 1, characterized in that: the bottom of the waveguide rod (2) is provided with a limiting ring (1), the diameter of the limiting ring (1) is smaller than the inner diameter of the piezometer tube (6), and the waveguide rod (2) is ensured not to be attached to the tube wall, so that the magnetic floating body (3) can freely move up and down along with the water level.

3. The following magnetostrictive water level gauge for the hydraulic engineering pressure measuring pipe according to claim 1, characterized in that: the pipe orifice cover plate (7) is provided with a protective cover (16).

Technical Field

The invention belongs to the technical field of measurement, can be applied to liquid level measurement in narrow spaces, particularly to water level measurement in manometers in dam infiltration line measurement, dam foundation osmotic pressure measurement and gate foundation osmotic pressure measurement processes, and can also be applied to liquid level measurement in similar occasions.

Background

The pressure measuring pipe of the dam is used for measuring the height of a dam infiltration line and provides a basis for calculating the osmotic pressure and stabilizing a dam body. In the aspect of dam foundation osmotic pressure and sluice osmotic pressure measurement, a piezometer tube is also required to measure the water level, and the diameter of the piezometer tube is generally 50mm for structural and functional reasons. The measuring devices used at present include float type, ultrasonic type, magnetic scale type, radar type, pressure sensor type, laser type, and the like. Among these water level measuring methods, the most commonly used method for measuring the water level of the small-diameter pressure measuring pipe is a pressure sensor method and a manual observation method. The pressure sensor is often called a throw-in type, remote automatic measurement can be realized, and manual rules require workers to go to a field for measurement; other methods are not suitable for measuring the water level of the pressure measuring pipe due to various reasons such as small aperture of the pressure measuring pipe. The input type pressure sensor is the most commonly used method at present, but due to reasons such as siltation and microorganisms, the service life is short, and the sensor is generally distorted or invalid about two years, so that dam engineering is lost in safety monitoring, and potential safety hazards are caused. Meanwhile, the input pressure sensor adopts an electric signal conversion method, and data drift can be caused and distorted due to various reasons. The adopted repairing method can only replace the sensor generally, which causes discontinuity of measurement, and the input type sensor has higher manufacturing cost and serious waste due to frequent replacement. The laser type water level meter is developed and applied in recent years, has good effect, but has high laser type manufacturing cost and large one-time investment, and is not widely popularized and applied at present. The magnetostrictive water level gauge is a liquid level gauge which is widely applied in recent years, the precision of the magnetostrictive water level gauge meets the requirement of liquid level measurement, and the magnetostrictive water level gauge comprises a hard rod type gauge, a flexible cable type gauge and the like. The long hard rod type pressure measuring pipe cannot be directly applied to the pressure measuring pipe, and the pressure measuring pipe is small in diameter, inclined and bent and cannot be directly used; the flexible cable type will be along with the pipeline bending, what the measurement is the length of flexible cable, and the error is great, and because the waveguide cable pastes the wall, the float is easily blocked and is caused malfunctioning. Improvements are therefore needed. The present invention has been made in view of this demand. The magnetostrictive water level meter and the servo mechanism are combined to realize the measurement of the water level of the small-diameter piezometer tube.

Disclosure of Invention

The invention aims to provide a device capable of measuring the water level in a pressure measuring pipe of a dam, which can avoid the measurement difficulty caused by the bending or the inclination of the pressure measuring pipe. The technical scheme adopted by the device for realizing the invention is as follows: the utility model provides a following magnetostrictive water level gauge for hydraulic engineering manometric tube, includes the manometric tube, its characterized in that: the method comprises the following steps that a pipe orifice cover plate is installed at the position of a pipe orifice of a dam pressure measuring pipe, a hole is formed in the pipe orifice cover plate, a base plate of a servo mechanism is fixed on the pipe orifice cover plate, a main support and an auxiliary support are installed on the base plate, and a winding roller, a servo motor and a sliding joint are installed on the main support; install the pulley on the assistant support, correspond pulley installation counter, the controller is fixed on the chassis, the controller passes through signal line connection servo motor, the cable on counter and the magnetostrictive instrument, the cable is connected to the controller after through the slip joint switching, the cable enters into the pressure-measuring pipe through the hole on the mouth of a pipe apron, be connected to on the signal converter at the waveguide pole top of magnetostrictive instrument, be equipped with the magnetism body on the waveguide pole, can be along with water level in the well goes up and down, be equipped with the spacing ring in the bottom of waveguide tube, the spacing ring diameter is less than the internal diameter of pressure-measuring pipe, guarantee that the waveguide pole does not paste the pipe wall, thereby guarantee that the magnetism body can be along with the water level. The pipe orifice cover plate 7 is provided with a protective cover 16.

The invention is characterized in that a servo motor controlled by a controller is arranged on a cover plate, the servo motor drives a winding roller, a signal cable on a magnetostriction instrument is connected to the winding roller through a pulley, and the signal cable is driven by positive and negative rotation of a motor, so that the magnetostriction instrument is driven to move up and down. The signal cable drives the pulley to rotate when passing through the pulley, the linear velocity of the contact point is equal, the pulley shaft is connected with the counter, and the length of the signal cable moving can be calculated through the diameter of the pulley and the counter, namely the distance of the magnetostrictive instrument moving up and down in the piezometer tube. The magnetostrictive instrument is placed in the pressure measuring pipe of the dam, so that the magnetic floating body on the waveguide tube floats on the water surface, the position of the magnetic floating body is the water surface position, the signal converter sends out a signal, the distance from the floating body to the top of the waveguide tube can be measured when the waveguide tube encounters the magnetic floating body, and the distance from the water surface in the pressure measuring pipe to the opening of the pressure measuring pipe can be measured by adding the length of the signal cable.

The distance L from the magnetic floating body to the top of the waveguide tube is preset with a maximum value L1 and a minimum value L2, when L is larger than or equal to L1, the cable on the waveguide tube descends under the control of the servo motor, and the magnetostrictive instrument descends; when L is less than or equal to L2, the cable on the waveguide tube rises under the control of the servo motor, and the magnetostrictive instrument rises; when the magnetic field is applied to the water level, the magnetic field is applied to the water level. The present invention has been made in view of this demand. The magnetostrictive water level meter and the servo mechanism are combined to realize the measurement of the water level of the small-diameter piezometer tube.

The invention uses the combination of magnetostriction measurement and a servo mechanism to solve the problem of water level measurement of the small-diameter piezometer tube of the buildings such as dams, water gates and the like.

Drawings

FIG. 1 is a schematic diagram of the present invention.

In the figure, 1, a limit ring; 2. a waveguide rod; 3. a magnetic float; 4. a signal converter; 5. a cable; 6. a piezometric tube; 7. a pipe orifice cover plate; 8. a chassis; 9. a winding roller; 10. a main support; 11. a servo motor; 12. a counter; 13. a controller; 14. a sub-mount; 15. a pulley; 16 a protective cover; 17. sliding joint, 18, hole, 19, well water level.

The specific implementation mode is as follows:

referring to the attached drawings, the following magnetostrictive water level gauge for the hydraulic engineering pressure measuring pipe comprises a pressure measuring pipe 6 and is characterized in that: a pipe orifice cover plate 7 is arranged at the position of a pipe orifice of a dam pressure measuring pipe 6, a hole 18 is formed in the pipe orifice cover plate 7, a chassis 8 of a servo mechanism is fixed on the pipe orifice cover plate 7, a main support 10 and an auxiliary support 14 are arranged on the chassis 8, and a winding roller 9, a servo motor 11 and a sliding joint 17 are arranged on the main support 10; the auxiliary support 14 is provided with a pulley 15, a counter 12 is arranged corresponding to the pulley 15, a controller 13 is fixed on a chassis 8, the controller 13 is connected with a servo motor 11 through a signal line, the counter 12 and a cable 5 on a magnetostrictive instrument, the cable 5 is connected to the controller 13 after being switched through a sliding joint 17, the cable 5 enters a pressure measuring pipe 6 through a hole 18 on a pipe orifice cover plate 7 and is connected to a signal converter 4 at the top of a waveguide rod 2 of the magnetostrictive instrument, a magnetic floating body 3 is arranged on the waveguide rod 2 and can lift along with the water level in a well, a limiting ring 1 is arranged at the bottom of the waveguide rod 2, the diameter of the limiting ring 1 is smaller than the inner diameter of the pressure measuring pipe 6, the waveguide rod 2 is guaranteed not to be attached to the pipe wall, and therefore the magnetic. The pipe orifice cover plate 7 is provided with a protective cover 16.

The sliding joint 17 consists of a movable ring and a stationary ring, the movable ring is connected with the cable 5 and concentrically fixed on a rotating shaft of the winding roller 9, and concentrically rotates along with the winding roller; the static ring is fixed on the main bracket 10, is connected with the controller 13 through a signal wire, collects signals of the magnetostriction meter and provides a low-voltage power supply.

When the device is used, the magnetic floating body 3 floats up and down along with the water level, during measurement, the signal converter 4 sends out excitation pulse current, the excitation pulse current is transmitted in the waveguide rod 2 and generates an induction magnetic field, interaction occurs when the excitation pulse current passes through the magnetic floating body 3, torsional stress is generated and is transmitted along the waveguide rod 2 in a stress wave mode, the transmission speed of the stress wave is fixed and known, so that the transmission time can be calculated according to the time of sending out the pulse current and the time of receiving the stress wave, the distance from the magnetic floating body 3 to the top is calculated, and the distance from the water level to the top of the waveguide rod 2 is calculated.

The controller 13 controls the whole magnetostrictive instrument to move up and down through a servo mechanism of a wellhead according to the preset distance between the magnetic floating body 3 and the upper end of the wave guide rod 2: when the magnetic floating body 3 rises under the buoyancy action of the rising water level and approaches the top of the waveguide rod 2, the controller 13 controls the servo motor 11 to rotate forwards to drive the winding roller 9 to rotate forwards, the cable 5 rises and drives the pulley 15 to rotate, the counter 12 is connected with the pulley 15 and records the rotating angle, and the magnetostrictive instrument rises integrally; on the contrary, when the magnetic floating body 3 approaches to the bottom of the waveguide rod 2 due to the drop of the water level, the controller 13 controls the servo motor 11 to rotate reversely, so as to drive the winding roller 9 to rotate reversely, the cable 5 to drop and drive the pulley 15 to rotate, the counter 12 is connected with the pulley 15 and records the rotating angle, and the whole magnetostrictive instrument drops. When the magnetic floating body 3 is in a set range, the whole magnetostrictive instrument is not moved, and only the magnetic floating body 3 floats up and down along with the water level. The controller 13 calculates the ascending or descending distance of the cable 5 through a counter 12 connected with the pulley 15, and the distance measured by the magnetic floating body 3 is combined with the distance to obtain the distance from the water surface to the wellhead, and the elevation of the wellhead is counted, so that the water level in the piezometer tube can be known.