Flat diaphragm pressure sensor for tunnel boring machines

Abstract

This utility model relates to a flat diaphragm pressure sensor for tunnel boring machines, comprising a sensor housing, a sensor diaphragm body, a signal shielding wire, and a strain gauge. The bottom of the sensor diaphragm body is a flat, sealed structure, and there are no pressure-applying holes at the bottom. The top of the sensor diaphragm body is detachably connected to the bottom of the sensor housing. The strain gauge is attached to the bottom of the inner wall of the sensor diaphragm body. A bridging PCB board and a transmitter PCB board are also provided inside the sensor diaphragm body, and the strain gauge, bridging PCB board, and transmitter PCB board are electrically connected in sequence. The signal shielding wire is inserted into the sensor housing, passes through the top of the sensor housing, and is electrically connected to the transmitter PCB board. This utility model features a completely flat diaphragm structure with no pressure-applying holes (cavities), ensuring that the measured medium will not clog the strain diaphragm and thus will not affect the measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, specifically to a flat diaphragm pressure sensor for tunnel boring machines. Background Technology

[0002] Monitoring soil pressure during tunnel boring machine (TBM) excavation is crucial. By analyzing the soil pressure data at different points within the chamber, excavation parameters can be adjusted accordingly. This necessitates that the pressure sensors possess excellent abrasion resistance, impact resistance, protective properties, and stability. Because the soil typically contains small stones or minerals, these particles can cause significant impacts to the sensors. Downtime caused by sensor malfunctions can result in substantial losses.

[0003] Therefore, a flat diaphragm pressure sensor for tunnel boring machines was developed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a flat diaphragm pressure sensor for tunnel boring machines. The sensor diaphragm has a completely flat structure with no pressure-inducing holes (cavities), so that the medium being measured will not clog the strain diaphragm and will not affect the measurement accuracy.

[0005] To achieve the aforementioned objectives, the present invention provides a flat diaphragm pressure sensor for tunnel boring machines, comprising a sensor housing, a sensor diaphragm body, a signal shielding wire, and strain gauges.

[0006] The bottom of the sensor diaphragm is a planar sealed structure, and there are no pressure holes at the bottom of the sensor diaphragm.

[0007] The top of the sensor diaphragm is detachably connected to the bottom of the sensor housing;

[0008] The strain gauge is attached to the bottom of the inner wall of the sensor diaphragm.

[0009] The sensor diaphragm body is also provided with a bridge PCB board and a transmitter PCB board, and the strain gauge, the bridge PCB board and the transmitter PCB board are electrically connected in sequence.

[0010] The signal shielding wire is inserted into the sensor housing and passes through the top of the sensor housing. The signal shielding wire is electrically connected to the transmitter PCB board.

[0011] Preferably, the sensor diaphragm is fixed to the sensor housing by screws.

[0012] Preferably, the strain gauge, the bridge PCB board, and the transmitter PCB board are arranged sequentially from bottom to top within the sensor diaphragm body.

[0013] Preferably, the portion of the signal shielding wire that passes through the sensor housing is secured with a wire-locking screw.

[0014] Compared with the prior art, the flat diaphragm pressure sensor for tunnel boring machines of this invention has the following advantages:

[0015] (1) The pressure-sensing surface has a flat membrane structure without pressure-inducing holes, which effectively prevents the inaccuracy caused by the blockage of the mud to be tested; the design concept is novel, the structure is unique, and the size is exquisite and compact.

[0016] (2) "Multi-purpose": It can be used for temperature measurement, pressure measurement, or simultaneous temperature and pressure measurement;

[0017] (3) Meet the performance and size requirements of the new tunnel boring machine;

[0018] (4) Effectively prevents cable from being damaged or broken when being dragged. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the flat diaphragm pressure sensor for the tunnel boring machine in this embodiment;

[0020] Figure 2 This is a schematic diagram of the internal structure of the flat diaphragm pressure sensor used in the tunnel boring machine according to this embodiment;

[0021] Figure 3 This is a cross-sectional view of the sensor diaphragm in this embodiment;

[0022] Figure 4 This is a top view of the sensor diaphragm in this embodiment. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example

[0025] like Figure 1 and Figure 2 As shown, the flat diaphragm pressure sensor for tunnel boring machines includes a sensor housing 1, a sensor diaphragm body 2, a signal shielding wire 3, and a strain gauge 4.

[0026] like Figure 3 and Figure 4 As shown, the bottom of the sensor diaphragm 2 is a planar sealed structure, and there is no pressure hole at the bottom of the sensor diaphragm 2. The top of the sensor diaphragm 2 is detachably connected to the bottom of the sensor housing 1.

[0027] In this embodiment, the sensor diaphragm 2 is fixed to the sensor housing 1 by screws 5.

[0028] The strain gauge 4 is attached to the bottom of the inner wall of the sensor diaphragm body 2.

[0029] The sensor diaphragm body 2 is also provided with a bridge PCB board 6 and a transmitter PCB board 7, and the strain gauge 4, the bridge PCB board 6 and the transmitter PCB board 7 are electrically connected in sequence.

[0030] In this embodiment, the strain gauge 4, the bridge PCB board 6, and the transmitter PCB board 7 are arranged sequentially from bottom to top inside the sensor diaphragm body 2 for easy installation and subsequent electrical connection.

[0031] The signal shielding wire 3 is inserted into the sensor housing 1 and passes through the top of the sensor housing 1. The signal shielding wire 3 is electrically connected to the transmitter PCB board 7.

[0032] In this embodiment, the part of the signal shielding wire 3 that passes through the sensor housing 1 is fixed by the wire locking screw 8, which effectively prevents the signal shielding wire 3 from falling off the sensor housing 1.

[0033] Strain gauge 4 is attached to the sensor diaphragm body 2. Pressure changes cause deformation at the bottom of the diaphragm body 2, which in turn causes deformation of the attached strain gauge 4, resulting in a change in the resistance of the strain gauge 4. The four attached strain gauge resistors are arranged in a Wheatstone bridge configuration. When a power supply excitation is applied to one pair of diagonals, a differential voltage output will be generated at the other pair of diagonals. This differential voltage output is proportional to the pressure. The pressure sensed by the diaphragm is determined by detecting this differential voltage.

[0034] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A flat diaphragm pressure sensor for a tunneling machine, characterized in that, Includes sensor housing, sensor diaphragm body, signal shielding wire, and strain gauge. The bottom of the sensor diaphragm is a planar sealed structure, and there are no pressure holes at the bottom of the sensor diaphragm. The top of the sensor diaphragm is detachably connected to the bottom of the sensor housing; The strain gauge is attached to the bottom of the inner wall of the sensor diaphragm body; The sensor diaphragm body is also provided with a bridge PCB board and a transmitter PCB board, and the strain gauge, the bridge PCB board and the transmitter PCB board are electrically connected in sequence. The signal shielding wire is inserted into the sensor housing and passes through the top of the sensor housing. The signal shielding wire is electrically connected to the transmitter PCB board.

2. The flat diaphragm pressure sensor for a tunneling machine according to claim 1, characterized by, The sensor diaphragm is fixed to the sensor housing by screws.

3. The flat diaphragm pressure sensor for a tunneling machine according to claim 1, characterized by, The strain gauge, the bridge PCB board, and the transmitter PCB board are arranged sequentially from bottom to top within the sensor diaphragm body.

4. The flat diaphragm pressure sensor for a tunneling machine according to any one of claims 1 to 3, characterized in that, The part of the signal shielding wire that passes through the sensor housing is secured with a wire-locking screw.

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