A shield cutterhead soil pressure monitoring system capable of wireless charging and sensor replacement

Abstract

The present invention discloses a shield cutterhead soil pressure monitoring system that can realize wireless charging and sensor replacement. The soil pressure sensor is installed in a sensor fixing device, and the soil pressure sensor fixing device is installed on the cutterhead. The soil pressure sensor signal line enters the cutterhead bearing lead hole through the cutterhead lead groove, is led out from the cutterhead bearing tail outlet hole, and is connected to the wireless transmitter module. The wireless charging module is composed of a receiving coil plate and a power supply coil plate. The receiving coil plate is fixed to the cutterhead bearing and connected to the battery of the wireless transmitter module. The power transmission coil plate is fixed to the cutterhead bearing drive motor support and connected to an external power supply. The power transmission coil transmits current to the receiving coil through electromagnetic induction to charge the wireless transmitter module. The present invention can realize real-time charging of the cutterhead soil pressure collection system during shield excavation, and can replace the soil pressure sensor after failure, providing a guarantee for the stable collection of shield cutterhead soil pressure data.

Description

Technical Field

[0001] The invention relates to a shield cutterhead soil pressure monitoring system capable of realizing wireless charging and sensor replacement, and belongs to the technical field of shield construction monitoring. Background Art

[0002] During shield tunneling, the stability of the excavation face largely determines the safety of construction. Only by real-time monitoring of the earth and water pressures on the excavation face can construction parameters be optimized to ensure the stability of the excavation face. Simultaneously, research on the stratum disturbance in front of the excavation face, the changes in earth pressure, and the matching of construction parameters all rely on the pressure on the excavation face. Therefore, stable monitoring of earth pressure on the shield cutterhead is of great significance to shield construction. Using model shield machines to conduct tunnel excavation simulation tests is an important research method. In order to better study the impact of shield tunneling construction on the surrounding environment in the laboratory, many scholars at home and abroad have conducted research on model shield testing machines, such as the small shield simulation test bench developed by Shanghai Tunnel Co., Ltd. (1996), the large-diameter model shield machine developed by Shanghai Tunnel Co., Ltd. in collaboration with Zhejiang University, Tongji University, etc. (2004), the double-shell single-helix model shield developed by Tongji University (2006), the earth pressure balance shield equipment developed by Beijing Jiaotong University (2007), the small-diameter slurry balance shield developed by He Chuan in 2013, and the small-diameter slurry balance shield developed by Shandong University (2016). He Chuan (2008, 2014) developed an earth pressure balance shield machine that can realize nationwide simulation of shield construction, but these shield machines only realize the monitoring of the earth pressure of the earth ballast panel. In 2020, Beijing University of Technology developed a model shield machine capable of monitoring earth pressure in the cutterhead, shield shell, and earth ballast compartment. The shield machine cutterhead uses a wireless data acquisition system to collect cutterhead earth pressure data. Model shield machines typically have a small internal space, so only small batteries can be installed in the wireless data acquisition module. This can lead to power outages in the cutterhead earth pressure wireless data acquisition system during shield excavation tests. Furthermore, the cutterhead earth pressure sensor is typically fixed to the cutterhead panel, making it difficult to replace if damaged. Therefore, it is necessary to design a shield cutterhead earth pressure monitoring system that can be wirelessly charged and the earth pressure sensor can be replaced. Summary of the Invention

[0003] The purpose of the present invention is to provide a shield cutterhead soil pressure monitoring system that can realize real-time charging of the cutterhead soil pressure collection system during shield excavation and can replace the soil pressure sensor in real time after failure, thereby providing a guarantee for the stable collection of cutterhead soil pressure data during shield construction.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A shield cutterhead soil pressure monitoring system capable of realizing wireless charging and soil pressure sensor replacement includes: a shield cutterhead, a soil pressure sensor fixing device, a cutterhead bearing, a wireless transmission module and a wireless charging module.

[0006] The earth pressure sensor fixture consists of a sensor protective housing, a fixed mandrel, and a sealing ring. The pressure sensor is located on top of the fixed mandrel, and the signal line is led out through the lead hole of the fixed mandrel. The fixed mandrel is inserted into the sensor protective housing. A limit mechanism is installed at the front end of the sensor protective housing to prevent the earth pressure sensor from sliding out of the front end of the sensor protective housing. A sealing ring is also installed between the fixed mandrel and the sensor protective housing, and between the sensor protective housing and the cutterhead backplate to achieve a seal at the position of the pressure sensor fixture.

[0007] The earth pressure sensor fixture is bolted to the cutterhead. The earth pressure sensor signal cable is routed through the cutterhead cable duct into a pre-reserved lead-in hole within the cutterhead bearing and then out through a cable outlet at the rear end of the cutterhead bearing. It then connects to a wireless transmitter module mounted on the rear end of the cutterhead bearing. The wireless transmitter module collects the data signal from the cutterhead earth pressure sensor and converts it into a wireless signal for transmission. An external data acquisition device receives and records the earth pressure signal. The wireless charging module's receiving coil board is fixed to the rear end of the cutterhead bearing and connected to the wireless transmitter module's battery. It rotates synchronously with the cutterhead. The wireless charging module's transmission coil board is fixed to the end of the cutterhead bearing's motor mounting bracket. It maintains a distance from and is concentric with the wireless charging module's receiving coil, but does not rotate with the cutterhead. The wireless charging module's transmission coil board is connected to an external power source and, when activated, charges the wireless transmitter module in real time. The wireless charging module's receiving coil board and charging coil board consist of two sets of wire coils that wirelessly transmit power through electromagnetic induction.

[0008] The working process and working principle of the present invention are:

[0009] Before the construction of the model shield machine, the soil pressure sensor is installed in the sensor fixing device, and then the soil pressure sensor fixing device is fixed to the cutterhead by bolts. After the signal line extends from the tail of the soil pressure sensor fixing device, it enters the cutterhead bearing lead hole through the cutterhead lead groove, and then leads out from the outlet hole at the tail of the cutterhead bearing to connect to the wireless transmitter module. The wireless charging module is installed at the tail of the cutterhead bearing, the receiving coil plate is fixed on the cutterhead bearing, and is connected to the battery of the wireless transmitter module. The transmission coil plate is fixed on the cutterhead bearing drive motor support and is connected to the external power supply. After the external power supply is started, the transmission coil transmits electricity to the receiving coil through electromagnetic induction to charge the wireless transmitter module. When the cutterhead pressure sensor is damaged, the sensor fixing device can be disassembled, the soil pressure sensor can be replaced, and the cutterhead soil pressure can continue to be collected after installation. The beneficial effects of the present invention are:

[0010] (1) This shield cutterhead soil pressure monitoring system with wireless charging and sensor replacement can realize real-time charging of the data transmission module in the cutterhead wireless soil pressure acquisition system during shield excavation, ensuring stable collection of cutterhead soil pressure data during shield construction;

[0011] (2) This shield cutterhead soil pressure monitoring system with wireless charging and sensor replacement can replace damaged soil pressure sensors during shield construction, ensuring full-process monitoring of the cutterhead soil pressure;

[0012] (3) The shield cutterhead soil pressure monitoring system, which does not require wireless charging and sensor replacement, improves the continuity of shield excavation model tests and the stability of cutterhead soil pressure data collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an overall view of the shield cutterhead soil pressure monitoring system described in the present invention.

[0014] Figure 2 This is a side view of the shield cutterhead soil pressure monitoring system described in the present invention.

[0015] Figure 3 This is the layout diagram of the cutterhead soil pressure sensor.

[0016] Figure 4 This is a cross-sectional view of the shield cutterhead soil pressure monitoring system described in the present invention.

[0017] Figure 5 This is a cross-sectional view of the cutterhead soil pressure sensor fixing device.

[0018] Figure 6 This is the diagram of the cutterhead soil pressure sensor fixing device. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to the accompanying drawings:

[0020] like Figures 1-6 As shown, the shield cutterhead soil pressure monitoring system of the present invention, which can realize wireless charging and sensor replacement, includes: a shield cutterhead 1, a soil pressure sensor fixing device 8, a cutterhead bearing 3, a wireless transmission module 4 and a wireless charging module.

[0021] The shield cutterhead 1 has a pressure sensor fixture mounting slot 11 and a wire duct 9 provided on its spokes. The soil pressure sensor 2 is embedded in the front end of the soil pressure sensor fixture 8, with the force-bearing surface of the soil pressure sensor 2 facing outward. The signal line extends from the rear end of the soil pressure sensor fixture 8. The soil pressure sensor fixture 8 is fixed to the cutterhead sensor mounting hole 11 by bolts 16. The soil pressure sensor 2 signal line is introduced through the cutterhead wire duct 9 into the lead-in hole 10 reserved inside the cutterhead bearing 3 and then leads out from the wire outlet hole at the rear end of the cutterhead bearing 3. The wireless transmitter module 4 is fixed to the rear end of the cutterhead bearing 3. The soil pressure sensor 2 signal line is led out from the wire outlet hole at the rear end of the cutterhead bearing 3 and connected to the wireless transmitter module 4. This collects the data signal from the shield cutterhead soil pressure sensor 2 and converts it into a wireless signal for transmission.

[0022] The wireless charging module consists of a receiving coil plate 5 and a transmitting coil plate 6. The receiving coil plate 5 is fixed to the rear end of the cutterhead bearing 3 and connected to the battery of the wireless transmitter module 4, rotating synchronously with the cutterhead. The transmitting coil plate 6 is fixed to the end of the fixing bracket of the cutterhead bearing motor 7. It is spaced and concentric with the receiving coil plate 5, but does not rotate with the cutterhead. The transmitting coil plate 6 is connected to an external power source and, when activated, can charge the wireless transmitter module 4 in real time. The receiving coil plate 5 and the transmitting coil plate 6 of the wireless charging module are two sets of wire coils that achieve wireless power transmission through electromagnetic induction.

[0023] The pressure sensor fixture 8 consists of a sensor protective housing 12, a fixed mandrel 13, a first sealing ring 14, a second sealing ring 15, and a fixing bolt 16. The earth pressure sensor 2 is located at the top of the fixed mandrel 13. The signal line is led out through a lead hole 17 in the fixed mandrel 13 and inserted into the sensor protective housing 12. A limit mechanism is provided at the front end of the sensor protective housing 12 to prevent the earth pressure sensor 2 from sliding out of the front end of the sensor protective housing 12. A second sealing ring 15 is provided between the fixed mandrel 13 and the sensor protective housing 12, and a first sealing ring 14 is provided between the sensor protective housing 12 and the backplate of the shield cutterhead 1, ensuring a seal at the location of the earth pressure sensor fixture 8.

Claims

1. A shield cutterhead soil pressure monitoring system capable of wireless charging and sensor replacement, characterized by: include: A shield cutterhead (1), a soil pressure sensor fixing device (8), a cutterhead bearing (3), a wireless transmitter module (4), and a wireless charging module; the shield cutterhead (1) is a component of a model shield machine; A pressure sensor fixing device mounting groove (11) and a wire groove (9) are provided on the spoke plate of the shield cutterhead (1); the soil pressure sensor (2) is embedded in the front end of the soil pressure sensor fixing device (8); the force-bearing surface of the pressure sensor (2) faces outward, and the signal line extends from the tail end of the soil pressure sensor fixing device (8); the pressure sensor fixing device (8) is fixed in the cutterhead sensor mounting hole (11) by bolts; the soil pressure sensor (2) signal line is introduced into the first lead hole (10) reserved inside the cutterhead bearing (3) through the wire groove (9) and is led out from the wire hole at the tail end of the cutterhead bearing (3); the wireless transmitting module (4) is fixed at the tail end of the cutterhead bearing (3); the soil pressure sensor (2) signal line is led out from the wire hole at the tail end of the cutterhead bearing (3) and is connected to the wireless transmitting module (4), collects the data signal of the soil pressure sensor (2), and converts it into a wireless signal for transmission; The wireless charging module is composed of a receiving coil plate (5) and a transmitting coil plate (6); the receiving coil plate (5) is fixed to the tail of the cutterhead bearing (3), connected to the battery of the wireless transmitting module (4), and rotates synchronously with the cutterhead; the transmitting coil plate (6) is fixed to the end of the fixing bracket of the cutterhead bearing motor (7), and is kept spaced and concentric with the receiving coil plate (5), and does not rotate with the shield cutterhead (1); the power supply coil plate (6) is connected to an external power supply, and after the power supply is started, the wireless transmitting module (4) is charged in real time; The power receiving coil plate (5) and the power transmitting coil plate (6) of the wireless charging module are two sets of wire coils, which realize wireless transmission of power by electromagnetic induction; The soil pressure sensor fixing device (8) comprises a sensor protective shell (12), a fixed top rod (13), and a sealing ring; the soil pressure sensor (2) is located at the top of the fixed top rod (13), the signal line is led out from the second lead hole (17) of the fixed top rod (13), and the fixed top rod (13) is inserted into the interior of the sensor protective shell (12); a limiting mechanism is provided at the front end of the sensor protective shell (12) to prevent the pressure sensor (2) from sliding out from the front end of the sensor protective shell (12); at the same time, sealing rings are provided between the fixed top rod (13) and the sensor protective shell (12), and between the sensor protective shell (12) and the back plate of the cutter head (1), so as to achieve sealing at the position of the soil pressure sensor fixing device (8).

2. The shield cutterhead soil pressure monitoring system capable of wireless charging and sensor replacement according to claim 1, characterized in that: Before the construction of the model shield machine, the soil pressure sensor is installed in the soil pressure sensor fixture, and then the soil pressure sensor fixture is fixed to the shield cutterhead with bolts. The signal line extends from the tail of the soil pressure sensor fixture, enters the cutterhead bearing lead hole through the lead groove, and then leads out from the outlet hole at the tail of the cutterhead bearing to connect to the wireless transmitter module; the wireless charging module is installed at the tail of the cutterhead bearing, the receiving coil plate is fixed on the cutterhead bearing, connected to the battery of the wireless transmitter module, and the transmission coil plate is fixed on the cutterhead bearing drive motor support and connected to the external power supply; after the external power supply is started, the transmission coil transmits electricity to the receiving coil through electromagnetic induction to charge the wireless transmitter module; when the soil pressure sensor of the shield cutterhead is damaged, the soil pressure sensor fixture is disassembled, the soil pressure sensor is replaced, and the soil pressure signal of the shield cutterhead is continued to be collected after installation.

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