Pressure measuring equipment suitable for complex environment and measuring method thereof

Abstract

The invention discloses a pressure measuring device suitable for a complex environment and a measuring method thereof. The equipment comprises a shell, a pressure sensor, a driving motor, a transmission shaft, a scraping plate and a sealing ring. The pressure sensor is arranged on a through hole of a front panel of the shell; the driving motor is connected with a transmission shaft which is rotatably supported on the shell through a bearing; the scraper is fixed at the end of the transmission shaft and clings to the outer surface of the shell; a first sealing ring is arranged between the transmission shaft and the shell; and a second sealing ring is arranged at the shell mounting hole. The driving motor drives the scraping plate to rotate, mortar, sludge and other sediments on the outer surface of the shell are actively scraped away, and the sediments are prevented from covering a probe area of the pressure sensor. The problem of measurement distortion caused by dirt blockage of the sensor in a complex environment is solved, and the data reliability is improved; a double-sealing structure prevents corrosion of external media, and the service life of equipment is prolonged; the modular design supports multi-point distributed deployment, and is suitable for severe working conditions such as tunnels, mines and river channels.

Description

TECHNICAL FIELD

[0001] The present application relates to the fields of tunnel engineering and shield equipment manufacturing, and particularly relates to a pressure measuring device suitable for complex environments and a measuring method thereof. BACKGROUND

[0002] In shield construction, the monitoring of environmental pressure is an important parameter reflecting the working state. For example, in the process of shield tunneling, the cutter head excavation chamber pressure needs to be balanced with the support pressure of the working face to maintain the stability of the working face; the synchronous grouting pressure of the shield tail needs to be matched with the stratum support pressure to ensure that the excavated stratum does not collapse. To achieve this goal, the excavation chamber pressure and the shield tail grouting area pressure need to be monitored in a timely and accurate manner. The patent with the publication number CN108798680B

[0003] file discloses a shield tunneling grouting pressure measuring system and a measuring method thereof, which monitors the soil pressure in the shield tail grouting area by installing a soil pressure sensor in the area. However, such an environment is usually filled with materials such as spoil, slurry, and mortar, and the pressure sensor is prone to failure or even damage when working in such a harsh environment. Therefore, it is necessary to design a pressure measuring system suitable for complex environments to ensure long-term stable monitoring of pressure data. SUMMARY

[0004] To solve the above problems, the present application proposes a pressure measuring device suitable for complex environments and a measuring method thereof, which overcomes the poor reliability of existing pressure monitoring devices in harsh environments and the problem of damage, and ensures the reliable perception ability of the shield control system to the working environment.

[0005] To achieve the above-mentioned application purposes, the present application proposes the following technical solutions: a pressure measuring device suitable for complex environments, comprising a shell, a plurality of pressure sensors arranged in the shell, a drive motor arranged at one end of the shell, a transmission shaft coaxially fixed to the drive motor, a scraper arranged at the other end of the transmission shaft, and a fixed clamping groove cooperating with the transmission shaft arranged on the scraper; a fixed bolt cooperating with the scraper is screwed on the transmission shaft; the scraper is attached to the outer surface of the shell; a first sealing ring cooperating with the transmission shaft is arranged in the shell, and the transmission shaft passes through the first sealing ring.

[0006] Further, the pressure sensors are arranged in an array in the shell, and the probes of the pressure sensors are flush with the outer surface of the shell.

[0007] Further, the probes of the pressure sensors are on the same side of the scraper.

[0008] Further, the transmission shaft is a waterproof bearing.

[0009] Further, a flange disc cooperating with the drive motor is arranged on the shell, and a plurality of connecting bolts are screwed on the flange disc.

[0010] Further: the scraper is a stainless steel fan-shaped scraper, and the gap between the scraper and the outer surface of the shell is less than 0.5mm.

[0011] Further: the end of the transmission shaft is provided with a threaded connection part matched with the fixing bolt, and the scraper is fixed on the transmission shaft through the fixing bolt.

[0012] Further: the side surface of the shell is provided with a mounting hole, the side surface of the shell is provided with a second sealing ring matched with the mounting hole, and the shell is provided with a sealing groove matched with the second sealing ring.

[0013] Further: the outer surface of the shell is sprayed with an anti-sticking coating.

[0014] Further: the shell is installed in the measured space of the shield machine, and the measured space includes the tail of the shield machine, the slurry chamber of the shield machine and the soil chamber of the shield machine.

[0015] A measuring method of a pressure measuring device suitable for complex environment, steps are as follows:

[0016] S1: first, the device is installed in the measured space of the shield machine, and the measured space includes the tail of the shield machine, the slurry chamber of the shield machine and the soil chamber of the shield machine;

[0017] S2: in the running process of the shield machine, the PLC control program controls the pressure sensor to monitor the external pressure in real time, and transmits to the upper computer;

[0018] S3: the upper computer analyzes the data transmitted by the pressure sensor, and takes the average value as the external pressure value of the position;

[0019] S4: when the deviation of the measurement value of one and the other two pressure sensors exceeds 5%, the data is discarded, and the average value of the remaining two measurement values is taken as the point pressure.

[0020] S5: when the measurement value deviation of the data transmitted by the three pressure sensors exceeds 5%, the driving motor is started, the scraper is driven to move through the transmission shaft, so as to realize the cleaning of the measuring position of the pressure sensor, and ensure the accuracy of the monitoring value of the pressure sensor.

[0021] Compared with the prior art, the gain effect of the present application is:

[0022] 1、the device can improve the accuracy and reliability of the detection result when measuring because of the multiple sensors.

[0023] 2、the setting of the scraper can remove the dirt at the end of the shell, avoid dirt deposition, solve the measurement distortion problem caused by dirt blockage of the sensor in complex environment, and improve the data reliability.

[0024] 3. Double sealing structure prevents external medium corrosion, prolongs service life of the equipment; modular design supports multi-point distributed deployment, suitable for tunnels, mines, rivers and other harsh working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a perspective view of the present application.

[0026] Figure 2 is a sectional view of the present application.

[0027] Figure 3 is a component view of the present application.

[0028] Figure 4 is a working state view of the present application.

[0029] In the figure: 1, scraper, 2, transmission shaft, 3, shell, 4, pressure sensor, 5, drive motor, 7, first sealing ring, 8, second sealing ring, 9, connecting bolt, 10, fixing bolt. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] Embodiment one:

[0032] A pressure measuring device suitable for complex environment, comprising a shell 3, a plurality of pressure sensors 4 are arranged in the shell 3, a drive motor 5 is arranged at one end of the shell 3, a transmission shaft 2 is coaxially fixedly connected with the drive motor 5, a scraper 1 is arranged at the other end of the transmission shaft 2, and a fixing clamping groove matched with the transmission shaft 2 is arranged on the scraper 1; a fixing bolt 10 matched with the scraper 1 is screwed on the transmission shaft 2; the scraper 1 is attached to the outer surface of the shell 3; a first sealing ring 7 matched with the transmission shaft 2 is arranged in the shell 3, and the transmission shaft 2 passes through the first sealing ring 7.

[0033] The pressure sensors 4 are arranged in an array in the shell 3, and the probe of the pressure sensor 4 is flush with the outer surface of the shell 3.

[0034] The probe of the pressure sensor 4 is on the same side as the scraper 1.

[0035] The transmission shaft 2 is a waterproof bearing.

[0036] A flange plate matched with the drive motor 5 is arranged on the shell 3, and a plurality of connecting bolts 9 are screwed on the flange plate.

[0037] The scraper 1 is a stainless steel fan-shaped blade, and the gap between the scraper 1 and the outer surface of the shell 3 is less than 0.5 mm.

[0038] The end of the transmission shaft 2 is provided with a threaded connection part matched with the fixing bolt 10, and the scraper 1 is fixed to the transmission shaft 2 through the fixing bolt 10.

[0039] The shell 3 is provided with a mounting hole on the side surface, and the shell 3 is provided with a second sealing ring 8 matched with the mounting hole, and the shell 3 is provided with a sealing groove matched with the second sealing ring 8.

[0040] The shell 3 is installed in the measured space of the shield machine, and the measured space includes the tail of the shield machine, the slurry chamber of the shield machine and the soil chamber of the shield machine.

[0041] The outer surface of the shell 3 is sprayed with an anti-sticking coating.

[0042] As shown in Figure 1 , 2 , 3 and 4, the shell 3 of the present application is installed in the tail of the shield machine, the slurry chamber of the shield machine or the soil chamber of the shield machine; the pressure measuring device is composed of a scraper 1, a transmission shaft 2, a shell 3, a pressure sensor 4, a driving motor 5, a sealing ring 7 and a sealing ring 8. The number of pressure sensors 4 is not less than 2, which are installed on one side of the shell 3 and used for measuring the pressure in complex environment; the driving motor 5 is installed on the other side of the shell 3 through the bolt 9, and the driving motor 5 is fixedly connected with the transmission shaft 2; the scraper 1 is installed on the other end of the transmission shaft 2 through the bolt 10; under the rotation of the driving motor 5, the scraper 1 can be rotated through the transmission shaft 2; the scraper 1 is tightly attached to the outer surface of the shell 3; the rotation of the scraper 1 can scrape off the mortar, sludge and other sundries deposited on the surface of the shell 3, prevent them from covering and blocking the measuring head area of the pressure sensor 4, avoid affecting the measurement accuracy of the probe of the pressure sensor 4, ensure the long-term stable operation of the pressure sensor 4; the pressure measuring device is installed at the measured position through the shell 3, and as a measuring point, the position and number of the pressure measuring devices can be arranged according to the needs; the first sealing ring 7 is arranged between the transmission shaft 2 and the shell 3, and the second sealing ring 8 is arranged on the side surface of the shell 3 for sealing; the first sealing ring 7 can prevent the sand from entering the device, thereby realizing the protection of the interior of the device, and the second sealing ring 8 realizes the protection of the mounting hole of the shell 3.

[0043] Example two:

[0044] A measuring method of a pressure measuring device suitable for complex environment, the steps are as follows:

[0045] S1: First, install the device in the measured space of the shield machine, and the measured space includes the tail of the shield machine, the slurry chamber of the shield machine and the soil chamber of the shield machine;

[0046] S2: In the running process of the shield machine, the PLC control program controls the pressure sensor 4 to monitor the external pressure in real time and transmit to the upper computer;

[0047] S3: The upper computer analyzes the data transmitted by the pressure sensor 4 and takes the average value as the external pressure value of the position;

[0048] S4: When the deviation of one of the data measured by the other two pressure sensors 4 exceeds 5%, the data is discarded and the average value of the other two measured values is taken as the point pressure.

[0049] S5: When the deviation of the data measured by the three pressure sensors 4 exceeds 5%, the driving motor 5 is started to drive the scraper 1 to move through the transmission shaft 2, so as to realize the cleaning of the measuring position of the pressure sensor 4, thereby ensuring the accuracy of the monitoring value of the pressure sensor 4.

[0050] On the basis of embodiment one, in the measuring process, the three pressure sensors simultaneously measure the pressure of the installation position, the driving motor 5 drives the scraper 1 to intermittently run at a certain time interval, and the foreign matter attached to the surface of the pressure sensor 4 is periodically removed to ensure the stability of the working environment of the sensor; the PLC control program simultaneously reads the monitoring data of the three pressure sensors and sends to the upper computer; the upper computer analyzes the three pressure data received, when the error of the three values is within 5%, it is considered that the measurement value of the measuring point is normal, and the average value of the three points is taken as the point pressure; when the deviation of one of the other two measurement values exceeds 5%, the measurement value is discarded, and the average value of the other two points is taken as the point pressure; when the deviation of the three measurement values exceeds 5%, the sensor of the measuring point needs to be repaired. In this way, the long-term stable pressure monitoring of the measuring point position can be maintained.

[0051] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0052] In the description of the application, it should be noted that, unless otherwise expressly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements; for those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

Claims

1. A pressure measurement device suitable for complex environments, characterized in that: The invention comprises a housing (3), wherein a plurality of pressure sensors (4) are arranged in the housing (3), a driving motor (5) is arranged at one end of the housing (3), the driving motor (5) is coaxially fixedly connected to a transmission shaft (2), a scraper (1) is arranged at the other end of the transmission shaft (2), a fixing groove matched with the transmission shaft (2) is arranged on the scraper (1), a fixing bolt (10) matched with the scraper (1) is screwed on the transmission shaft (2), the scraper (1) is fitted with the outer surface of the housing (3), a first sealing ring (7) matched with the transmission shaft (2) is arranged in the housing (3), and the transmission shaft (2) passes through the first sealing ring (7).

2. The pressure measuring device according to claim 1, characterized in that: The pressure sensors (4) are arranged in an array inside the housing (3), and the probes of the pressure sensors (4) are flush with the outer surface of the housing (3).

3. The pressure measuring device according to claim 1, characterized in that: The probe of the pressure sensor (4) is on the same side as the scraper (1); and the transmission shaft (2) is a waterproof bearing.

4. The pressure measuring device according to claim 1, wherein: The housing (3) is provided with a flange matched with the drive motor (5), and a plurality of connecting bolts (9) are screwed on the flange.

5. The pressure measuring device according to claim 1, characterized in that: The scraper (1) is a stainless steel fan-shaped scraper, and the gap between the scraper (1) and the outer surface of the shell (3) is less than 0.5 mm.

6. The pressure measuring device according to claim 1, characterized in that: The end of the transmission shaft (2) is provided with a threaded connection portion that matches the fixing bolt (10), and the scraper (1) is fixed to the transmission shaft (2) via the fixing bolt (10).

7. The pressure measurement device according to claim 1, characterized in that: The side of the shell (3) is provided with a mounting hole, the side of the shell (3) is provided with a second sealing ring (8) that matches the mounting hole, and the shell (3) is provided with a sealing groove that matches the second sealing ring (8).

8. The pressure measurement device according to claim 1, characterized in that: The shell (3) is installed in the measured space of the shield machine, and the measured space includes the tail of the shield machine, the mud and water bin of the shield machine, and the soil bin of the shield machine.

9. The pressure measuring device according to any one of claims 1 to 8, characterized in that: The outer surface of the shell (3) is sprayed with an anti-stick coating.

10. A measurement method for pressure measurement equipment suitable for complex environments, characterized in that: The steps are as follows: S1: First install the device in the measured space of the shield machine, which includes the tail of the shield machine, the slurry tank of the shield machine, and the soil tank of the shield machine; S2: During the operation of the shield machine, the PLC control program controls the pressure sensor (4) to monitor the external pressure in real time and transmit it to the host computer; S3: The host computer analyzes the data transmitted by the pressure sensor (4) and takes the average value as the external pressure value at that position; S4: When the deviation of the measured data transmitted by one of the other two pressure sensors (4) exceeds 5%, the data is discarded and the average value of the remaining two measured values ​​is taken as the pressure at the point. S5: When the deviations of the data measurement values ​​transmitted by the three pressure sensors (4) all exceed 5%, the drive motor (5) is started to drive the scraper (1) to move through the transmission shaft (2), thereby cleaning the measurement position of the pressure sensor (4) and ensuring the accuracy of the monitoring value of the pressure sensor (4).

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