Wireless flexible pressure monitoring sensing system for shield tunneling machine

Abstract

The utility model discloses a wireless flexible pressure monitoring sensing system for a shield tunneling machine, and the system comprises a pedestal which is detachably connected to a soil bin of the shield tunneling machine; the pressure sensing equipment is arranged on the base; the wireless communication equipment is arranged on the base; the controller is arranged on the base; the controller is electrically connected with the pressure sensing device and the wireless communication device and is in communication connection with an external intelligent terminal through the wireless communication device. The flexible shell is arranged on the base, and a containing space is defined by the flexible shell and the base; the pressure sensing equipment is positioned in the accommodating space; and the flexible shell is used for triggering the pressure sensing equipment during deformation. The wireless flexible pressure monitoring sensing system for the shield tunneling machine is integrally assembled on the soil bin of the shield tunneling machine through the base, and the pressure signal is transmitted to the external intelligent terminal through wireless communication, so that the pressure data of the soil bin of the shield tunneling machine are obtained; the problem that the pressure data of the soil bin are difficult to obtain due to high-speed rotation and vibration in the working process of an existing shield tunneling machine is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure monitoring, in particular to a wireless flexible pressure monitoring and sensing system for a shield machine. Background Art

[0002] In modern urban transportation construction, more and more tunnel construction, including subway construction, etc., chooses to use the shield method for construction; during the construction and tunneling process of the shield machine, the monitoring of the soil chamber pressure inside the shield machine is very crucial.

[0003] In the prior art, the internal structure of the shield machine is complex. When the shield machine is working, the main structure rotates highly, and the position of the soil chamber will be blocked, resulting in difficulty in monitoring the soil chamber pressure inside the shield machine.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a wireless flexible pressure monitoring and sensing system for a shield machine aiming at the above defects of the prior art, aiming to improve the pressure monitoring efficiency.

[0006] The technical solution adopted by the utility model to solve the technical problem is as follows:

[0007] A wireless flexible pressure monitoring and sensing system for a shield machine, which comprises:

[0008] A base for detachably connecting to the soil chamber of the shield machine;

[0009] A pressure sensing device arranged on the base;

[0010] A wireless communication device arranged on the base;

[0011] A controller arranged on the base; the controller is electrically connected to the pressure sensing device and the wireless communication device respectively, and is communicatively connected to an external intelligent terminal through the wireless communication device;

[0012] A flexible shell arranged on the base and enclosing a receiving space with the base; the pressure sensing device is located in the receiving space; the flexible shell is used for triggering the pressure sensing device when deforming.

[0013] In the wireless flexible pressure monitoring and sensing system for a shield machine, wherein, the pressure sensing device comprises:

[0014] A first conductive structure;

[0015] A second conductive structure, arranged opposite to the first conductive structure and in contact with each other;

[0016] A connecting wire, which is electrically connected to one side of the first conductive structure and the second conductive structure respectively.

[0017] The wireless flexible pressure monitoring sensing system for a shield machine, wherein the first conductive structure includes:

[0018] A first PDMS film;

[0019] A first conductive layer, which is located on the side of the first PDMS film facing the second conductive structure and covers the first PDMS film.

[0020] The wireless flexible pressure monitoring sensing system for a shield machine, wherein the second conductive structure includes:

[0021] A second PDMS film;

[0022] A plurality of convex hulls, which are arranged in an array on the side of the second PDMS film facing the first conductive structure;

[0023] A second conductive layer, which is located on the side of the second PDMS film facing the first conductive structure and covers the convex hulls and the second PDMS film respectively.

[0024] The wireless flexible pressure monitoring sensing system for a shield machine, wherein the first conductive layer and the second conductive layer are carbon-based conductive layers or polymer conductive layers.

[0025] The wireless flexible pressure monitoring sensing system for a shield machine, wherein the convex hull is a hemispherical convex hull.

[0026] The wireless flexible pressure monitoring sensing system for a shield machine, wherein the height of the hemispherical convex hull protruding relative to the second PDMS film is equal to the radius of the hemispherical convex hull.

[0027] The wireless flexible pressure monitoring sensing system for a shield machine, wherein the flexible housing includes:

[0028] A flexible support member, which is arranged on the base and is arranged in a closed-loop structure around the periphery of the pressure sensing device; one end of the closed-loop structure away from the base has an opening;

[0029] A rigid trigger plate, which is arranged on the flexible support member and blocks the opening; the rigid trigger plate is arranged opposite to the pressure sensing device to trigger the pressure sensing device.

[0030] For the wireless flexible pressure monitoring and sensing system for a shield machine, the distance between the rigid trigger plate and the pressure sensing device is less than 1 / 3 of the height of the flexible housing.

[0031] The wireless flexible pressure monitoring and sensing system for a shield machine further includes:

[0032] A power supply; the power supply is arranged on the base and is electrically connected to the controller.

[0033] Beneficial effects: In this application, through the detachable connection between the base and the soil bin of the shield machine, the overall structure of the wireless flexible pressure monitoring and sensing system for the shield machine is assembled on the soil bin inside the shield machine, and the pressure signal is transmitted to the external intelligent terminal through wireless communication, so as to obtain the pressure data of the soil bin inside the shield machine, overcoming the problem in the prior art that it is difficult to obtain the soil bin pressure data due to the high-speed rotation and vibration during the operation of the shield machine. Description of the Drawings

[0034] Figure 1 is the overall structural schematic diagram of the wireless flexible pressure monitoring and sensing system for the shield machine described in the present utility model;

[0035] Figure 2 is the reference diagram of the usage state of the pressure sensing device when the convex hull is in the natural state in the present utility model;

[0036] Figure 3 is the reference diagram of the usage state of the pressure sensing device when the convex hull is deformed under pressure in the present utility model;

[0037] Figure 4 is the curve graph of the resistance of the pressure sensing device changing with pressure;

[0038] Figure 5 is the functional principle block diagram of the wireless flexible pressure monitoring and sensing system for the shield machine described in the present utility model. Detailed Embodiments

[0039] The following will describe the embodiments of the present utility model with reference to the drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be understood that the preferred embodiments are only for explaining the present utility model and not for limiting the protection scope of the present utility model.

[0040] It should be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0041] The present invention provides a wireless flexible pressure monitoring sensing system for a shield machine, as Figure 1 and Figure 5 shown. The wireless flexible pressure monitoring sensing system for the shield machine includes a base 1, a pressure sensing device 2, a wireless communication device 3, a controller 4, and a flexible housing 5. The base 1 is used to carry the pressure sensing device 2, the wireless communication device 3, the controller 4, and the flexible housing 5, and the base 1 is used to be detachably connected to the soil chamber of the shield machine, so as to integrally assemble the wireless flexible pressure monitoring sensing system for the shield machine on the soil chamber of the shield machine to monitor the pressure of the internal soil chamber of the shield machine.

[0042] Specifically, the pressure sensing device 2, the wireless communication device 3, the controller 4, and the flexible housing 5 are all arranged on the base 1. The controller 4 is electrically connected to the pressure sensing device 2 and the wireless communication device 3 respectively, and the controller 4 is communicatively connected to an external intelligent terminal through the wireless communication device 3. Thus, when the pressure sensing device 2 monitors and obtains a pressure signal, the controller 4 receives the pressure signal and transmits the pressure signal to the external intelligent terminal by wireless transmission, and the staff can obtain the pressure data of the internal soil chamber of the shield machine.

[0043] An accommodation space is formed by enclosing between the flexible housing 5 and the base 1, and the pressure sensing device 2 is located in the accommodation space. When the flexible housing 5 deforms, the flexible housing 5 can deform and squeeze the accommodation space, thereby triggering the pressure sensing device 2 and enabling the controller 4 to obtain a pressure signal.

[0044] In this application, through the detachable connection between the base 1 and the soil chamber of the shield machine, the overall structure of the wireless flexible pressure monitoring sensing system for the shield machine is assembled on the soil chamber inside the shield machine, and the pressure signal is transmitted to the external intelligent terminal by wireless communication, so as to obtain the pressure data of the internal soil chamber of the shield machine, overcoming the problem in the prior art that it is difficult to obtain the soil chamber pressure data due to the high-speed rotation and vibration during the operation of the shield machine.

[0045] A plurality of threaded holes 11 are provided on the base 1. The threaded holes 11 are assembled with the soil bin of the shield machine through threaded connection type fasteners such as bolts to achieve detachable connection between the base 1 and the soil bin of the shield machine, so as to realize detachable assembly of the overall wireless flexible pressure monitoring and sensing system for the shield machine on the soil bin inside the shield machine. And because the connection between the base 1 and the soil bin of the shield machine is detachable, even if the wireless flexible pressure monitoring and sensing system for the shield machine is damaged, it can be replaced and repaired in time.

[0046] Specifically, the base 1 is a PTFE (polytetrafluoroethylene) base 1, which is formed by 3D printing; there are two threaded holes 11, which are distributed on opposite sides of the flexible housing 5 for connecting the overall wireless flexible pressure monitoring and sensing system for the shield machine with the soil bin inside the shield machine.

[0047] As Figure 2 shown, the pressure sensing device 2 includes a first conductive structure 21, a second conductive structure 22 and a connecting wire 23; the second conductive structure 22 is arranged opposite to the first conductive structure 21 and in contact with each other; the connecting wire 23 is electrically connected to the opposite sides of the first conductive structure 21 and the second conductive structure 22 respectively, and is electrically connected to the controller 4, so as to transmit the monitored pressure signal to the controller 4.

[0048] In an embodiment of the present application, the wireless flexible pressure monitoring and sensing system for the shield machine further includes a protective cover 7, the protective cover 7 is close to the flexible housing 5, and both the wireless communication device 3 and the controller 4 are located inside the protective cover 7. One end of the connecting wire 23 is located inside the flexible housing 5 and is electrically connected to the first conductive structure 21 and the second conductive structure 22 respectively; the other end of the connecting wire 23 passes through the flexible housing 5 and extends into the protective cover 7, so as to be electrically connected to the controller 4.

[0049] In this embodiment, both the flexible housing 5 and the protective cover 7 protect the connecting wire 23, reducing the area of the connecting wire 23 exposed to the internal environment of the shield machine, thereby reducing or even avoiding damage to the connecting wire 23 during the operation of the shield machine.

[0050] Specifically, the first conductive structure 21 includes a first PDMS (polydimethylsiloxane) film and a first conductive layer; the first conductive layer is located on the side of the first PDMS film facing the second conductive structure 22 and covers the first PDMS film. The second conductive structure 22 includes a second PDMS film, a second conductive layer and a plurality of convex hulls 221 (such as Figure 2As shown in the figure; a plurality of convex hulls 221 are arranged in an array on the side of the second PDMS film facing the first conductive structure 21; the second conductive layer is located on the side of the second PDMS film facing the first conductive structure 21 and covers the convex hulls 221 and the second PDMS film respectively; the connection line 23 is electrically connected to the first conductive layer and the second conductive layer respectively.

[0051] When subjected to external pressure, the convex hulls 221 will be compressed and deformed (as Figure 3 shown in the figure). After deformation, the contact area between the convex hulls 221 and the first conductive structure 21 becomes larger, and the resistance value of the pressure sensing device 2 will correspondingly become smaller. The change in this resistance value can further be expressed as a change in the pressure value.

[0052] In a specific application, when the flexible housing 5 is squeezed and deformed and squeezes the pressure sensing device 2, the first PDMS film presses down the second PDMS film, the convex hulls 221 are squeezed and deformed, the contact area between the convex hulls 221 and the first conductive structure 21 increases, the resistance value of the pressure sensing device 2 changes, and thus a pressure signal is generated and transmitted to the controller 4.

[0053] In this application, the convex hulls 221 are arranged on the second PDMS film, so that when the pressure sensing device 2 is squeezed, the squeezing force can act on the convex hulls 221, causing the convex hulls 221 to deform. The convex hull array can concentrate the externally applied pressure on certain specific areas of the pressure sensing device 2, increasing the local stress in these areas; at the same time, when the convex hulls 221 are under pressure, they will produce a more significant deformation than a planar structure. This significant deformation can generate a stronger electrical signal or resistance change, which can be more effectively monitored by the pressure sensing device 2, thereby improving the detection sensitivity of the pressure sensing device 2 and enhancing the mechanical response of the pressure sensing device 2.

[0054] In addition, the convex hull array can increase the effective contact area between the two PDMS films, enabling the pressure sensing device 2 to maintain a good contact effect under pressures in different directions, thereby improving the stability and consistency of measurement; the convex hull array can also prevent the relative sliding between the two PDMS films to a certain extent, ensuring the stable position between the two PDMS films during the pressure sensing process, and further improving the measurement accuracy of the pressure sensing device 2.

[0055] In an embodiment of this application, the first conductive layer and the second conductive layer are carbon-based conductive layers or polymer conductive layers.

[0056] Carbon-based materials such as graphene, carbon nanotubes, carbon black, etc. have very high electrical conductivity, which can improve the sensitivity and response speed of the pressure sensing device 2, and have excellent mechanical strength and flexibility, can withstand high stress and multiple repeated bends, are suitable for flexible sensing devices, and extend the service life. Moreover, carbon-based materials have a high specific surface area, which can significantly increase the effective contact area of the sensor and improve its performance.

[0057] Polymer conductive materials (such as PEDOT, 3,4-ethylenedioxythiophene monomer polymer, PSS, sodium salt of propylene sulfate alginate) usually have good flexibility and ductility, enabling them to be applied to flexible electronic devices and wearable devices; polymer conductive materials are relatively inexpensive and are easy to mass-produce by methods such as printing and coating; and polymer materials have a low density, making the manufactured sensors light and not adding an extra burden.

[0058] Compared with the conductive layers of other materials, the carbon-based conductive layer or the polymer conductive layer is selected in this embodiment, making the processing of the first conductive layer and the second conductive layer relatively simple, softer, and more suitable for use in flexible electronic devices.

[0059] In one embodiment of the present application, the convex hull 221 is a hemispherical convex hull.

[0060] The hemispherical structure of the hemispherical convex hull 221 can evenly distribute stress when subjected to pressure, avoiding stress concentration caused by sharp corners or edge effects, thereby reducing the risk of material fatigue and damage; the hemispherical structure deforms more linearly after being stressed, and the contact area with the contact surface changes more smoothly and evenly, avoiding local slip or unstable contact phenomena, and can provide a more stable and linear sensing signal, improving the accuracy and sensitivity of the pressure sensing device 2 and reducing noise and errors caused by non-linear deformation. At the same time, due to the uniform stress distribution of the hemispherical structure of the convex hull 221, it can better resist fatigue damage under multiple repeated pressure actions and extend the service life of the pressure sensing device 2.

[0061] In one implementation manner of this embodiment, the height of the hemispherical convex hull 221 protruding from the second PDMS film is equal to the radius of the hemispherical convex hull 221.

[0062] In this embodiment, the height of the hemispherical convex hull 221 protruding relative to the second PDMS film is equal to the radius of the hemispherical convex hull 221, making the geometric shape of the hemispherical convex hull 221 more stable, capable of evenly distributing pressure, avoiding local stress concentration, which helps reduce material fatigue and damage, and improves the lifespan of the pressure sensing device 2; such a geometric ratio enables the hemispherical convex hull 221 to generate a more linear deformation response when subjected to pressure, thereby enhancing the linearity and accuracy of the pressure sensing device 2, making the output signal more reliable and predictable.

[0063] Meanwhile, such a design can form an optimal contact area, evenly distribute pressure, reduce stress concentration at the top and edges of the convex hull 221, further improve the durability and reliability of the pressure sensing device 2, ensure stable contact during the operation of the pressure sensing device 2, reduce slip and unstable contact phenomena, enable the convex hull 221 to maintain symmetry during deformation, improve structural stability, and avoid errors and signal noise caused by asymmetric deformation.

[0064] In one embodiment of this example, the diameter of the hemispherical convex hull 221 is 40 μm, and the height of the hemispherical convex hull 221 protruding relative to the second PDMS film is 20 μm.

[0065] The preparation method of the pressure sensing device 2 is as follows:

[0066] S100: Use a femtosecond laser device to process a micro-pit structure on a copper sheet with a width of 40 μm and a depth of 20 μm, and form a 10×10 rectangular hemispherical convex hull array.

[0067] S200: Ultrasonically clean the copper sheet obtained in S100 for 10 minutes;

[0068] S300: Prepare PDMS with a mass ratio of 10:1 (where the base agent is 10 g and the curing agent is 1 g). After the copper sheet in S200 is air-dried, pour the prepared PDMS onto the copper sheet. After the PDMS flows freely and evenly, place it in a vacuum heating furnace and heat it at 100 °C for 30 minutes. After taking it out and naturally cooling, remove the excess PDMS, and peel the PDMS from the copper sheet to obtain the second PDMS film with a convex hull array structure;

[0069] S400: Pour the prepared PDMS onto an unprocessed copper sheet. After the PDMS flows freely and evenly, place it in a vacuum heating furnace and heat it at 100 °C for 30 minutes. After taking it out and naturally cooling, remove the excess PDMS to obtain the first PDMS film;

[0070] S500. Take the PDMS base agent (6 g) and curing agent (0.6 g) with a mass ratio of 10:1 and add them to the ethyl acetate solution (25 g). Stir magnetically at room temperature for 10 minutes, then add multi-walled carbon nanotubes (0.2 g) and carbon black (0.8 g) with a mass ratio of 1:4. After stirring magnetically at room temperature for 30 minutes, perform ultrasonic treatment for 30 minutes to obtain a mixed solution. After spraying the obtained mixed solution on both the side of the second PDMS film with the convex bump array structure and the first PDMS film, heat the two PDMS films at 70 °C for 30 minutes, thereby forming the first conductive layer on the first PDMS film and forming the second conductive layer on the second PDMS film and the convex bumps 221.

[0071] S600. Apply a layer of conductive silver paste on the first conductive layer and the second conductive layer respectively. Assemble the first PDMS film and the second PDMS film so that the first conductive layer is arranged opposite to the convex bumps 221, and lead out the first conductive layer and the second conductive layer through the conductive silver paste using the connecting wire 23 to obtain the pressure sensing device 2.

[0072] As Figure 4 shown, Figure 4 shows the relationship between resistance and pressure. Specifically, Figure 4 the horizontal axis in it represents pressure (kPa), and the vertical axis represents relative resistance change (ΔR / R0). Figure 4 The data points in it represent the relative resistance changes measured at different pressures. The curve shows the trend that the resistance decreases with the increase of pressure. The law of the change of the resistance characteristics of the material with pressure can be obtained, thereby providing data support for further application research.

[0073] The flexible housing 5 includes a flexible support member 51 and a rigid trigger plate 52. The flexible support member 51 is arranged on the base 1 and is arranged in a closed-loop structure along the periphery of the pressure sensing device 2. One end of the closed-loop structure away from the base 1 has an opening. The rigid trigger plate 52 is arranged on the flexible support member 51 and blocks the opening. The rigid trigger plate 52 is arranged opposite to the pressure sensing device 2 to trigger the pressure sensing device 2.

[0074] When external pressure squeezes the rigid trigger plate 52, the flexible support member 51 is stressed and deformed. The distance between the rigid trigger plate 52 and the pressure sensing device 2 decreases until the rigid trigger plate 52 contacts and squeezes the pressure sensing device 2, thereby generating a pressure signal. The relative arrangement of the rigid trigger plate 52 and the pressure sensing device 2 can reduce the influence of the overall deformation of the flexible housing 5 on the installation structure of the pressure sensing device 2 and enhance the stability of the system.

[0075] It should be noted that when the flexible support member 51 is in its natural state (i.e., not deformed), there is a gap between the rigid trigger plate 52 and the pressure sensing device 2, ensuring that the pressure sensing device 2 will not be triggered.

[0076] The flexible support member 51 is made of Ecoflex (aliphatic aromatic random copolyester) elastic silicone material, epoxy resin material, and / or polydimethylsiloxane material, and is formed by a molding method using a mold; the rigid trigger plate 52 is made of PTEF (polytetrafluoroethylene) material and / or glass material, and is formed by 3D printing.

[0077] In an embodiment of the present application, a positioning platform 6 is further provided on the base 1. The positioning platform 6 is located inside the flexible housing 5, and the pressure sensing device 2 is disposed on the positioning platform 6. The positioning platform 6 is used to carry the pressure sensing device 2 and reduce the distance between the pressure sensing device 2 and the rigid trigger plate 52.

[0078] In an embodiment of this embodiment, the positioning platform 6 and the base 1 are of an integrally formed structure.

[0079] In an embodiment of the present application, the distance between the rigid trigger plate 52 and the pressure sensing device 2 is less than 1 / 3 of the height of the flexible housing 5, which can shorten the pressure transmission path and reduce the response time of the pressure sensing device 2, so that when the flexible housing 5 is subjected to pressure, it can transfer the deformation to the pressure sensing device 2 more directly and quickly; if the distance between the rigid trigger plate 52 and the pressure sensing device 2 is too large, part of the energy will be lost during the pressure transmission process, reducing the measurement sensitivity.

[0080] The wireless flexible pressure monitoring sensing system for a shield machine further includes a power supply 8. The power supply 8 is located inside the protective cover 7 and is disposed on the base 1; the power supply 8 is electrically connected to the controller 4. The power supply 8 includes a battery unit composed of multiple batteries, and the battery can be a polymer lithium battery with a capacity of 4800 mAH or a button battery.

[0081] The wireless communication device 3 can perform signal data transmission with an external intelligent terminal device by using wireless communication methods such as Bluetooth, WIFI, and Zigbee. In an embodiment of the present application, the controller 4 uses a single-chip microcomputer of the STM32L432KC model, and the wireless communication device 3 uses Bluetooth BT27.

[0082] In summary, the present application provides a wireless flexible pressure monitoring and sensing system for a shield machine, which includes: a base for detachably connecting to the soil chamber of the shield machine; a pressure sensing device disposed on the base; a wireless communication device disposed on the base; a controller disposed on the base; the controller is electrically connected to the pressure sensing device and the wireless communication device respectively, and communicates with an external intelligent terminal through the wireless communication device; a flexible housing disposed on the base and enclosing a receiving space with the base; the pressure sensing device is located in the receiving space; the flexible housing is used to trigger the pressure sensing device when deformed. In the present application, through the detachable connection between the base and the soil chamber of the shield machine, the overall structure of the wireless flexible pressure monitoring and sensing system for the shield machine is assembled on the soil chamber inside the shield machine, and the pressure signal is transmitted to the external intelligent terminal by wireless communication, so as to obtain the pressure data of the soil chamber inside the shield machine, overcoming the problem that it is difficult to obtain the soil chamber pressure data due to the high-speed rotation and vibration during the operation of the shield machine in the prior art.

[0083] It should be understood that the application of the present utility model is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. A wireless flexible pressure monitoring sensor system for a shield machine, characterized in that: It includes: A base, used for detachably connecting to the soil bin of the shield machine; A pressure sensing device is disposed on the base; A wireless communication device is arranged on the base; A controller, arranged on the base; The controller is electrically connected to the pressure sensing device and the wireless communication device respectively, and is communicatively connected to an external intelligent terminal through the wireless communication device; A flexible housing is disposed on the base and forms a receiving space with the base; The pressure sensing device is located in the accommodation space; The flexible housing is used to trigger the pressure sensing device when deformed.

2. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 1 is characterized in that: The pressure sensing device comprises: a first conductive structure; A second conductive structure is arranged opposite to the first conductive structure and contacts with each other; The connecting wires are electrically connected to opposite sides of the first conductive structure and the second conductive structure respectively.

3. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 2 is characterized in that: The first conductive structure comprises: First PDMS film; The first conductive layer is located on a side of the first PDMS film facing the second conductive structure and covers the first PDMS film.

4. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 3 is characterized in that: The second conductive structure comprises: Second PDMS film; A plurality of convex hulls are arranged in an array on a side of the second PDMS film facing the first conductive structure; The second conductive layer is located on a side of the second PDMS film facing the first conductive structure and covers the convex bulge and the second PDMS film respectively.

5. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 4 is characterized in that: The first conductive layer and the second conductive layer are carbon-based conductive layers or polymer conductive layers.

6. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 4 is characterized in that: The convex hull is a hemispherical convex hull.

7. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 6 is characterized in that: A height of the hemispherical convex hull protruding relative to the second PDMS film is equal to a radius of the hemispherical convex hull.

8. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 1, characterized in that: The flexible housing comprises: A flexible support member is disposed on the base and is arranged around the periphery of the pressure sensing device to form a closed loop structure; the closed loop structure has an opening at one end away from the base; A rigid trigger plate is disposed on the flexible support member and covers the opening; the rigid trigger plate is arranged opposite to the pressure sensing device to trigger the pressure sensing device.

9. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 8, characterized in that: The distance between the rigid trigger plate and the pressure sensing device is less than 1 / 3 of the height of the flexible housing.

10. The wireless flexible pressure monitoring sensor system for a shield machine according to claim 1, characterized in that: It also includes: Power supply; the power supply is arranged on the base and is electrically connected to the controller.

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