阅读说明：本技术 一种高铁路基沉降监测静力水准仪的低温漂检测系统 (Low-temperature drift detection system of high-speed railway foundation settlement monitoring hydrostatic level ) 是由 施阁 于佳敏 罗宗旭 单超 吕云杰 于 2021-09-15 设计创作，主要内容包括：本发明公开了一种高铁路基沉降监测静力水准仪的低温漂检测系统,包括气管、液管、数据总线、储液装置、仓体、基准点物位计、测点物位计、气压控制装置,储液装置、基准点物位计、测点物位计由气管、液管连通并由数据总线实现对各节点测量数据的读取。基准点物位计与测点物位计均包括水管接头、气管接头、安装支架。气压控制装置与储液装置的气腔相连,包括可压缩式回弹气囊、步进电机、丝杆、圆法兰铜螺母、气囊接口器、施压上板和施压下板,将两个丝杆一端连接两个步进电机并固定施压下板,另一端连接圆法兰铜螺母固定施压上板,控制可压缩式回弹气囊。该装置可使环境温度变化对系统测量结果的影响大大降低,对被测物体实施准确监测。(The invention discloses a low-temperature drift detection system of a high-speed railway foundation settlement monitoring hydrostatic level, which comprises an air pipe, a liquid pipe, a data bus, a liquid storage device, a cabin body, a reference point level meter, a measuring point level meter and an air pressure control device, wherein the liquid storage device, the reference point level meter and the measuring point level meter are communicated by the air pipe and the liquid pipe and read measured data of each node by the data bus. The reference point level meter and the measuring point level meter comprise water pipe connectors, air pipe connectors and mounting brackets. The air pressure control device is connected with an air cavity of the liquid storage device and comprises a compressible rebound air bag, a stepping motor, a screw rod, a circular flange copper nut, an air bag connector, a pressing upper plate and a pressing lower plate, wherein one end of the two screw rods is connected with the two stepping motors and the pressing lower plate is fixed, the other end of the two screw rods is connected with the circular flange copper nut and the pressing upper plate is fixed, and the compressible rebound air bag is controlled. The device can greatly reduce the influence of the environmental temperature change on the system measurement result, and accurately monitor the measured object.)

1. The low-temperature drift detection system of the high-speed railway base settlement monitoring static level gauge comprises an air pipe (1), a liquid pipe (2), a data bus (3), a liquid storage device (4), a bin body (5), a datum point level gauge (6), a measuring point level gauge (7) and an air pressure control device (8), wherein the liquid storage device (4), the datum point level gauge (6) and the measuring point level gauge (7) are communicated through the air pipe (1) and the liquid pipe (2) and read the measured data of all nodes through the data bus (3), the datum point level gauge (6) and the measuring point level gauge (7) respectively comprise a water pipe connector (9), an air pipe connector (10) and a mounting bracket (11), the air cavity of the air pressure control device (8) is connected with the air cavity of the liquid storage device (4) and comprises a compressible type rebound air bag (12), a stepping motor (13), a lead screw (14), a circular flange copper nut (15), The device comprises an air bag interface device (16), a pressure applying upper plate (17) and a pressure applying lower plate (18), wherein one ends of two screw rods (14) are connected with two stepping motors (13) and fix the pressure applying lower plate (18), the other ends of the two screw rods are connected with a round flange copper nut (15) and fix the pressure applying upper plate (17), and a compressible rebound air bag (12) is controlled.

2. The low temperature drift detection system of the high-speed railway foundation settlement monitoring hydrostatic level gauge as claimed in claim 1, wherein the reference point level gauge (6) and the plurality of measuring point level gauges (7) connected with the liquid storage device (4) are provided with a pressure sensor chip of MPX12D type, and the chip converts the change of front and rear pressure into the change of a pressure-sensitive element arranged in the sensor through calculation processing and outputs an analog signal.

3. The system for detecting the low temperature drift of the static level for high-speed railway foundation settlement monitoring as claimed in claim 1, wherein the air pressure control device (8) detects the air pressure condition in the system in real time through the current air pressure data of the system measured in real time by the pressure sensor transmitted back on the data bus (3) based on the control algorithm based on the RS-485 communication protocol, and when the current air pressure in the system is different from the set standard air pressure, the system drives the stepping motor (13) to rotate to drive the screw rod (14) to drive the pressing upper plate (17) to compress or relax the compressible resilient air bag (12) so as to perform compensation control on the air pressure in the system.

4. The system for detecting the low temperature drift of the high-speed railway foundation settlement monitoring hydrostatic level as claimed in claim 1, wherein the compressible resilient air bag (12) is fixed between the upper pressing plate (17) and the lower pressing plate (18), and the housing of the compressible resilient air bag can be made of polypropylene plastics or other materials with strong sealing performance.

5. The low temperature drift detection system of the high railway foundation settlement monitoring hydrostatic level according to claim 1, wherein the air bag connector (16) is used for connecting the compressible rebound air bag (12) with the air pipe (1), comprises a circular hole, is manufactured by a 3D printer, and is made of polyvinyl chloride plastic.

6. The system for detecting the low temperature drift of the high-speed railway foundation settlement monitoring hydrostatic level gauge according to claim 1, wherein the upper pressing plate (17) and the lower pressing plate (18) can compress or relax the compressible resilient air bag (12) to perform compensation control on the air pressure in the system, and acrylic or other materials can be used.

Technical Field

The invention belongs to the technical field of detection, and particularly relates to a low-temperature drift detection system of a high-speed railway foundation settlement monitoring hydrostatic level.

Background

In recent years, the construction of high-speed railways in China is rapidly developed. However, the unevenness of the roadbed and the track of the high-speed railway with the speed of more than 200km/h causes much more serious vibration of the train caused by rapid running than that of the train with the ordinary speed under the same condition, so the high-speed railway puts higher requirements on the smoothness of the track. The static level monitoring system is widely accepted by the engineering field and used in the high-speed railway line monitoring, and compared with the traditional monitoring method, the static level monitoring system can realize real-time and accurate measurement and provides important guarantee for the safe operation of the high-speed railway. The working media of the static leveling system are gas and liquid, and the volume of the working media is easily changed by external influence. In hydrostatic leveling systems, temperature factors have a very large influence on the measurement of the system.

At present, the idea and the method for reducing the influence of temperature on the static level gauge are basically based on data processing at home and abroad, for example: the influence of the temperature difference between the pressure and the temperature gradiometer pot body in the water pipe on the precision of the static leveling system is discussed by the people in the Nakayage industry and the like, and a temperature correction formula is provided through theoretical calculation; obtaining a temperature correction formula through theoretical calculation, and performing temperature correction on a test result of the test precision according to a measured value in each pot body and a temperature gradient in a communicating pipe; the forest culture medium is characterized in that temperature sensors are arranged on the pot bodies, and the influence caused by the temperature difference of the pot bodies is eliminated through an experimental fitting method. However, the existing method cannot meet the conditions of the temperature experiment, the factors for forming errors are complex, a true accurate correction fitting formula is difficult to find, and in practical application, the error generated by calculation is calculated according to the temperature of each pot body obtained by field measurement, and is subtracted from the measurement reading to obtain a corrected result, so that the calculation process is complex. There are also some studies to protect the hydrostatic level by adding devices to improve the measurement accuracy. Such as the patent: CN201120286757.3 provides a device that improves hydrostatic level measuring accuracy, and the device adopts box structure, and fixed mounting is peripheral at hydrostatic level, prevents that hydrostatic level from receiving the direct sunlight, reduces the amplitude of change of instrument container temperature and temperature, makes the temperature synchro change of entire system instrument. As another patent: 201820997595.6, a static water level gauge for reducing temperature error is provided, which comprises a ceramic cavity structure, a nozzle, a metal protective shell combined with the ceramic cavity structure and diffused silicon. The device sets up the metal protection shell in the ceramic material outside, can make the instrument work under adverse circumstances. Although the device reduces the influence of temperature on the static level to a certain extent, the method for protecting the static level by adding the device does not effectively improve the measurement accuracy of the static level, and the manufacturing material cost is high, so that the device is not suitable for being used in high-speed railway foundation settlement monitoring. It can be seen that the low-temperature drift high-speed railway-based monitoring technology is not mature, and therefore, a new low-temperature drift monitoring system solving the above problems is needed in practice.

The invention discloses a low-temperature drift detection system of a high-speed railway foundation settlement monitoring hydrostatic level, which comprises an air pipe, a liquid pipe, a data bus, a liquid storage device, a cabin body, a reference point level meter, a measuring point level meter and an air pressure control device, wherein the liquid storage device, the reference point level meter and the measuring point level meter are communicated by the air pipe and the liquid pipe and read measured data of each node by the data bus. The reference point level meter and the measuring point level meter comprise water pipe connectors, air pipe connectors and mounting brackets. The air pressure control device is connected with an air cavity of the liquid storage device and comprises a compressible rebound air bag, a stepping motor, a screw rod, a circular flange copper nut, an air bag connector, a pressing upper plate and a pressing lower plate, wherein one end of the two screw rods is connected with the two stepping motors and the pressing lower plate is fixed, the other end of the two screw rods is connected with the circular flange copper nut and the pressing upper plate is fixed, and the compressible rebound air bag is controlled. The device can greatly reduce the influence of the environmental temperature change on the system measurement result, and accurately monitor the measured object.

Disclosure of Invention

The purpose of the invention is as follows: the low temperature drift detection system of the high-speed railway foundation settlement monitoring hydrostatic level comprises a pressure sensor, a lead screw, a screw rod driving pressing plate, a compressible rebound air bag, a pressure compensation control device and a pressure sensor, wherein the pressure sensor is used for detecting the current air pressure in the system in real time, the lead screw is used for driving the lead screw to rotate, the lead screw drives the pressing plate to compress or relax the compressible rebound air bag, the pressure compensation control device is used for compensating the air pressure in the system, the lead screw can be self-adaptive to the measurement error caused by the influence of the temperature change on the gas in the device, the influence of the environment temperature change on the measurement result of the system is greatly reduced, and the measured object is accurately monitored.

In order to realize the invention, the technical scheme is as follows: a low-temperature drift detection system of a high-speed railway foundation settlement monitoring hydrostatic level comprises an air pipe, a liquid pipe, a data bus, a liquid storage device, a bin body, a reference point level meter, a measuring point level meter and an air pressure control device, wherein the liquid storage device, the reference point level meter and the measuring point level meter are communicated through the air pipe and the liquid pipe and read measured data of all nodes through the data bus. The reference point level meter and the measuring point level meter comprise water pipe connectors, air pipe connectors and mounting brackets. The air pressure control device is connected with an air cavity of the liquid storage device and comprises a compressible rebound air bag, a stepping motor, a screw rod, a circular flange copper nut, an air bag connector, a pressing upper plate and a pressing lower plate, wherein one end of the two screw rods is connected with the two stepping motors and the pressing lower plate is fixed, the other end of the two screw rods is connected with the circular flange copper nut and the pressing upper plate is fixed, and the compressible rebound air bag is controlled. The system drives the stepping motor to rotate to drive the lead screw to drive the pressing plate to compress or relax the compressible rebound air bag so as to perform compensation control on the air pressure in the system. The device can reduce the influence of the environmental temperature change on the system measurement result to be small enough, and accurately monitor the measured object.

The invention has the beneficial effects that:

1. the air pressure control device is connected with an air cavity of the liquid storage device, and the stepping motor drives the upper pressing plate to compress or relax the compressible rebound air bag, so that compensation control of air pressure in the system can be realized.

2. The air bag connector made of the polyvinyl chloride plastic and the air bag shell made of the polypropylene plastic have good sealing performance, and the measuring accuracy is guaranteed.

3. The acrylic pressure plate is durable, is not easy to wear, has an environment-friendly effect, can save cost and is convenient to produce and manufacture.

Drawings

FIG. 1 shows a low temperature drift detection system based on a high railway foundation settlement monitoring hydrostatic level gauge of the invention

A schematic structural diagram;

FIG. 2 is a front view of the air pressure control device of the present invention;

FIG. 3 is a front view of the reference point level gauge and the measuring point level gauge of the present invention;

FIG. 4 is a side view of the datum point level gauge and the gauge point level gauge of the present invention;

wherein: 1: an air tube; 2: a liquid pipe; 3: a data bus; 4: a liquid storage device; 5: a bin body; 6: a reference point level meter; 7: measuring a point level meter; 8: a pneumatic control device; 9: a water pipe joint; 10: a gas pipe joint; 11: mounting a bracket; 12: a compressible rebound air bag; 13: a stepping motor; 14: a screw rod; 15: a round flange copper nut; 16: an air bag interface; 17: pressing an upper plate; 18: the lower plate is pressed.

Detailed Description

The utility model provides a high-speed railway base settlement monitoring hydrostatic level's low temperature floats detecting system, includes trachea (1), liquid pipe (2), data bus (3), stock solution device (4), storehouse body (5), benchmark level meter (6), measurement point level meter (7), air pressure control device (8), stock solution device (4), benchmark level meter (6), measurement point level meter (7) are by trachea (1), liquid pipe (2) intercommunication and realize reading to each node measured data by data bus (3). The reference point level meter (6) and the measuring point level meter (7) respectively comprise a water pipe joint (9), an air pipe joint (10) and a mounting bracket (11). The air pressure control device (8) is connected with an air cavity of the liquid storage device (4) and comprises a compressible rebound air bag (12), a stepping motor (13), a screw rod (14), a round flange copper nut (15), an air bag connector (16), an upper pressing plate (17) and a lower pressing plate (18), wherein one end of each of the two screw rods (14) is connected with the two stepping motors (13) and the lower pressing plate (18) is fixed, the other end of each of the two screw rods is connected with the round flange copper nut (15) and the upper pressing plate (17) is fixed, and the compressible rebound air bag (12) is controlled. The device can greatly reduce the influence of the environmental temperature change on the system measurement result, and accurately monitor the measured object.

The working principle is as follows: the device utilizes a compressible rebound air bag (12), a stepping motor (13), a screw rod (14), a round flange copper nut (15), an air bag interface device (16), a pressing upper plate (17) and a pressing lower plate (18) to form an air pressure control device (8), the air pressure control device (8) is connected with an air cavity of a liquid storage device (4), the liquid storage device (4), a reference point level meter (6) and a measuring point level meter (7) are communicated by an air pipe (1) and a liquid pipe (2) and read the measured data of each node by a data bus (3), the reference point level meter (6) and a plurality of measuring point level meters (7) are provided with pressure sensor chips with the model of MPX12D, the level meters take a control algorithm based on an RS-485 communication protocol as a basis and detect the air pressure condition in the system in real time by measuring the current air pressure data of the pressure sensor chips transmitted back on the bus, when the current air pressure in the system is different from the set standard air pressure, the system drives the stepping motor (13) to rotate to drive the screw rod (14) to drive the pressing upper plate (17) to compress or relax the compressible rebound air bag (12) so as to perform compensation control on the air pressure in the system.

Preferably, one reference point level meter (6) and a plurality of measuring point level meters (7) connected with the liquid storage device (4) are provided with a pressure sensor chip with the model of MPX12D, the pressure sensor chip converts the change of front pressure and back pressure into the change of a built-in pressure-sensitive element of the sensor through calculation processing, and outputs analog signals.

Preferably, the compressible rebound air bag (12) is fixed between the upper pressing plate (17) and the lower pressing plate (18), and the shell of the compressible rebound air bag can be made of polypropylene plastics or other materials with strong sealing property.

Preferably, the air bag connector (16) is used for connecting the compressible rebound air bag (12) and the air pipe (1), contains a round hole, is manufactured by a 3D printer and is made of polyvinyl chloride plastic.

Preferably, the pressing lower plate (18) is fixed, the upper pressing plate (17) compresses or relaxes the compressible rebound air bag (12) to compensate and control air pressure in the system, and acrylic or other materials can be adopted.

The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; moreover, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.