A sensor protection device inside a soil chamber of a shield machine

Abstract

The application discloses a sensor protection device in the earth chamber of a shield machine, and relates to the technical field of sensor installation of the shield machine.The protection device comprises a protector shell, a link welding groove is arranged at the bottom end of the protector shell, a sealing structure is arranged at the top of the protector shell, a sensor fixing mechanism is arranged at the bottom of the protector shell, the sealing structure comprises a clamping bracket, the clamping bracket is fixedly connected to the inner cavity of the protector shell, a sealing rubber ring is arranged at the top end of the clamping bracket, a tempered glass transparent cover is arranged at the top end of the sealing rubber ring, a sealing compression ring is arranged at the top end of the tempered glass transparent cover, and the protection device further comprises a mounting mechanism and an extrusion mechanism.The sensor in the earth chamber of the shield machine is effectively protected by the protection device, so that the service life of the sensor is remarkably prolonged, the maintenance cost of the shield machine is reduced, and the overall working efficiency and safety of the shield machine are improved.

Description

TECHNICAL FIELD

[0001] The application relates to a shield machine sensor mounting technology field, in particular to a sensor protection device in the soil bin of a shield machine. BACKGROUND

[0002] With the rapid development of urban infrastructure construction, as an important equipment for modern tunneling, the performance and technical level of the shield machine play a crucial role in ensuring the safety of tunnel construction and improving the construction efficiency. In the actual use process of the shield machine, the environmental conditions in the soil bin are extremely complex, and the soil, mud and other substances frequently contact various components of the shield machine, especially the sensors in the soil bin, which have particularly harsh working environments.

[0003] As an important part of the shield machine, the soil bin sensor bears the task of real-time monitoring of important parameters such as pressure, humidity and temperature in the soil bin, and is a key equipment for ensuring the normal work and construction safety of the shield machine. However, in actual work, the soil, mud and other substances in the soil bin have strong corrosiveness and abrasiveness, which can easily damage the sensor and affect the normal work of the shield machine, and even cause construction safety accidents.

[0004] The traditional soil bin sensor installation method often adopts the method of being directly exposed in the soil bin. Although the environmental parameters in the soil bin can be directly obtained, the sensor is easily eroded and abraded by the soil, mud and other substances due to the lack of necessary protection measures, which leads to the decline of the performance of the sensor, the shortening of the service life of the sensor, and even the failure of the sensor. In addition, the sensor directly exposed in the soil bin is difficult to clean and maintain effectively, which further aggravates the damage and failure risk of the sensor.

[0005] In order to solve the above problems and improve the service life and reliability of the soil bin sensor of the shield machine, the application provides a sensor protection device suitable for the soil bin of the shield machine. The device wraps the sensor in a relatively closed structure with protection function through special design and manufacturing process, so that the sensor can be relatively isolated from the external environment, reducing the direct erosion and abrasion of the soil, mud and other substances on the sensor. At the same time, the device is designed with a structure convenient for cleaning and maintenance, so that even if the sensor is contaminated to a certain extent during use, it can be easily cleaned and maintained, so as to ensure that the sensor can always be in good working condition.

[0006] In summary, the application is proposed to solve the problem that the soil bin sensor of the shield machine is easily eroded and abraded, improve the service life and reliability of the sensor, and provide strong protection for the normal work and construction safety of the shield machine. SUMMARY

[0007] The present application aims at overcoming the above-mentioned defects of the prior art, and provides a sensor protection device inside a soil chamber of a shield tunneling machine.

[0008] To achieve the above object, the present application provides a sensor protection device inside a soil chamber of a shield tunneling machine, which comprises a protector shell, a linking welding groove is arranged at the bottom end of the protector shell, a sealing structure is arranged at the top of the protector shell, a sensor fixing mechanism is arranged at the bottom of the protector shell, the sealing structure comprises a clamping bracket, the clamping bracket is fixedly connected to the inner cavity of the protector shell, a sealing rubber ring is arranged at the top end of the clamping bracket, a tempered glass transparent cover is arranged at the top end of the sealing rubber ring, a sealing compression ring is arranged at the top end of the tempered glass transparent cover, a sealing fixing block is installed in the inner cavity of the protector shell, the sealing fixing block is located at the top end of the sealing compression ring, the sensor fixing mechanism comprises a seat trapezoidal mounting groove, the seat trapezoidal mounting groove is arranged at the bottom end of the inner wall of the protector shell, a sensor fixing base is arranged on the seat trapezoidal mounting groove, a trapezoidal groove is arranged at the bottom end of the sensor fixing base, a sensor connecting hole is arranged at the top end of the sensor fixing base, a limiting block is installed above the sensor fixing base in the inner cavity of the protector shell, the sealing fixing block is installed through an installation mechanism, and the limiting block fixes the sensor fixing base through a pressing mechanism.

[0009] As a further scheme of the present application, the installation mechanism comprises a slot, the slot is arranged in the inner wall of the protector shell, a positioning groove is arranged in the inner wall of the slot, a rotating column is rotatably connected to one end of the sealing fixing block, a first threaded rod is fixedly connected to the outer wall of the rotating column, a pushing block is connected to the outer wall of the first threaded rod, the pushing block is slidably connected to the inside of the sealing fixing block, a positioning block is slidably connected to one end of the pushing block in the inside of the sealing fixing block, and a first spring is connected between the positioning block and the sealing fixing block.

[0010] As a further scheme of the present application, the installation mechanism further comprises a threaded groove, the threaded groove is arranged at one end of the sealing fixing block and located outside the rotating column, a shielding cover is threadedly connected in the inside of the threaded groove, a circular hole is arranged in the outer wall of the shielding cover, a circular column is slidably connected to the inner wall of the circular hole, a connecting plate is fixedly connected to one end of the rotating column, and a through hole is arranged in the outer wall of the connecting plate.

[0011] As a further further scheme of the present application: the extrusion mechanism comprises a lower pressing block, the lower pressing block is slidingly connected to the inside of the limiting block and extends to the bottom end of the limiting block, the top end of the limiting block is rotatably connected with a second threaded rod extending into the inside of the lower pressing block, the outer wall of the second threaded rod is fixedly connected with a gear disc, the inside of the limiting block is slidingly connected with a horizontal plate on one side of the gear disc, the horizontal plate is fixedly connected with a tooth block and a pulling rod on the side facing the gear disc, and the pulling rod extends out of the limiting block.

[0012] As a further further scheme of the present application: the extrusion mechanism further comprises a vertical plate, the vertical plate is slidingly connected to the inside of the limiting block and extends above the limiting block, a second spring is connected between the vertical plate and the limiting block, the outer wall of the horizontal plate is fixedly connected with a fixing rod, the outer wall of the vertical plate is provided with an inclined slot, the fixing rod is slidingly connected to the inner wall of the inclined slot, the inside of the protector shell is provided with a movable slot for sliding of the limiting block and the vertical plate, a third spring is connected between the limiting block and the movable slot, the top end of the movable slot is fixedly connected with a clamping block, the inside of the protector shell is slidingly connected with an extrusion rod, the top end of the extrusion rod extends to the inner cavity of the insertion slot, the bottom end of the extrusion rod extends to the inner wall of the movable slot, and a fourth spring is connected between the extrusion rod and the protector shell.

[0013] As a further further scheme of the present application: the outer wall of the sealing fixing block is fitted with the inner wall of the insertion slot, the outer wall of the pushing block is provided with a first threaded hole matched with the first threaded rod, one side of the positioning block is provided with a first inclined surface, and the top outer wall of the positioning block is fitted with the inner wall of the positioning groove.

[0014] As a further further scheme of the present application: the inner wall of the shielding cover is fitted with the outer wall of the rotating column, the outer wall of the cylinder is fitted with the inner wall of the through hole, and the outer wall of the cylinder is tightly fitted with the inner wall of the circular hole.

[0015] As a further further scheme of the present application: the top end of the lower pressing block is provided with a second threaded hole matched with the second threaded rod.

[0016] As a further further scheme of the present application: the outer wall of the fixing rod is fitted with the inner wall of the inclined slot, and the clamping block is provided with a second inclined surface on the side facing the limiting block.

[0017] As a further further scheme of the present application: one end of the tooth block is engaged with the gear disc, and one end of the extrusion rod in the inner cavity of the insertion slot is triangular.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1、The protection device of the present application adopts a sealing design, in particular a shield-free sealing mechanism, which is composed of a three-layer structure of a sealing rubber ring, a tempered glass transparent cover and a sealing compression ring, to ensure effective isolation of the sensor from the external environment. The sealing rubber ring is tightly attached to the inside of the protector shell, sealing all gaps through its own deformation, thereby achieving internal sealing of the protector shell and effectively preventing erosion and wear by substances such as soil and mud water;

[0020] 2、The sensor fixing mechanism of the present application adopts a trapezoidal mounting slot design, in which the sensor fixing base can freely rotate and be fixed by a limiting block. This design not only facilitates installation, but also ensures stable connection between the sensor and the sensor fixing base, reducing damage to the sensor caused by vibration and other factors;

[0021] 3、The design of the tempered glass transparent cover of the sealing structure of the present application allows for convenient cleaning by disassembling the tempered glass transparent cover even if the sensor is contaminated to some extent during use. At the same time, the design of the sealing structure also ensures stability and reliability during disassembly and installation;

[0022] 4、The protection device of the present application effectively protects the sensors inside the soil chamber of the shield machine, thereby significantly prolonging the service life of the sensors. This not only reduces the maintenance cost of the shield machine, but also improves the overall work efficiency and safety of the shield machine. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the present application;

[0024] Figure 2 is an installation schematic diagram of the sensor fixing base of the present application;

[0025] Figure 3 is an installation schematic diagram of the tempered glass transparent cover of the present application;

[0026] Figure 4 is a sectional view of the sealing fixing block of the present application;

[0027] Figure 5 is a sectional view of the protector shell of the present application;

[0028] Figure 6 is a structural schematic diagram of the present application Figure 5 is an enlarged view of position A in the present application;

[0029] Figure 7 is a sectional view of the limiting block of the present application;

[0030] Figure 8 is a structural schematic diagram of the cross plate of the present application.

[0031] In the figure: 1, protector shell; 2, link welding groove; 3, sealing structure; 301, card holder; 302, sealing rubber ring; 303, tempered glass transparent cover; 304, sealing compression ring; 305, sealing fixed block; 4, sensor fixing mechanism; 401, sensor fixing base; 402, limiting block; 403, seat trapezoidal installation groove; 404, sensor connecting hole; 405, trapezoidal groove; 5, installation mechanism; 501, insertion slot; 502, positioning groove; 503, rotating column; 504, first threaded rod; 505, push block; 506, positioning block; 507, first spring; 508, threaded groove; 509, shielding cover; 510, round hole; 511, cylinder; 512, connecting plate; 513, through hole; 6, extrusion mechanism; 601, lower pressing block; 602, second threaded rod; 603, toothed disc; 604, cross plate; 605, toothed block; 606, pulling rod; 607, vertical plate; 608, second spring; 609, fixed rod; 610, inclined slot; 611, movable slot; 612, third spring; 613, clamping block; 614, extrusion rod; 615, fourth spring. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0033] 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 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, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The embodiments of the present application will be described below according to the overall structure of the present application.

[0034] Please refer toFigures 1 to 8 The sensor protection device for the inside of the earth chamber of a shield tunneling machine in the embodiment of the present application comprises a protector shell 1, the bottom end of the protector shell 1 is provided with a link welding groove 2, the top of the protector shell 1 is provided with a sealing structure 3, the bottom of the protector shell 1 is provided with a sensor fixing mechanism 4, the sealing structure 3 comprises a clamping bracket 301, the clamping bracket 301 is fixedly connected to the inner cavity of the protector shell 1, the top end of the clamping bracket 301 is provided with a sealing rubber ring 302, the top end of the sealing rubber ring 302 is provided with a tempered glass transparent cover 303, the top end of the tempered glass transparent cover 303 is provided with a sealing compression ring 304, the inner cavity of the protector shell 1 is installed with a sealing fixing block 305, the sealing fixing block 305 is located at the top end of the sealing compression ring 304, the sensor fixing mechanism 4 comprises a seat trapezoidal mounting groove 403, the seat trapezoidal mounting groove 403 is opened at the bottom end of the inner wall of the protector shell 1, a sensor fixing base 401 is arranged on the seat trapezoidal mounting groove 403, the bottom end of the sensor fixing base 401 is provided with a trapezoidal groove 405, the top end of the sensor fixing base 401 is provided with a sensor connecting hole 404, the inner cavity of the protector shell 1 is installed with a limiting block 402 above the sensor fixing base 401, the sealing fixing block 305 is installed through an installation mechanism 5, and the limiting block 402 fixes the sensor fixing base 401 through a pressing mechanism 6.

[0035] In the embodiment, the protection device adopts a sealing design, in particular a shielding sealing mechanism, a three-layer structure composed of the sealing rubber ring 302, the tempered glass transparent cover 303 and the sealing compression ring 304, which ensures the effective isolation of the sensor from the external environment. The sealing rubber ring 302 is tightly attached to the inside of the protector shell 1, seals all the gaps through its own deformation, realizes the sealing of the inside of the protector shell 1, and thus effectively prevents the erosion and wear of the mud, mud water and other substances.

[0036] The sensor fixing mechanism 4 adopts a trapezoidal mounting groove design, the sensor fixing base 401 can freely rotate therein and is fixed through the limiting block 402. This design not only facilitates the installation, but also ensures the stable connection between the sensor and the sensor fixing base 401, and reduces the damage of the sensor caused by vibration and the like.

[0037] The design of the tempered glass transparent cover 303 of the sealing structure 3 makes it possible to clean the sensor conveniently by disassembling the tempered glass transparent cover 303 even if the sensor is polluted to a certain extent in the use process. At the same time, the design of the sealing structure 3 also ensures the stability and reliability in the disassembly and installation process.

[0038] Through the protection device of the present application, the sensor in the inside of the earth chamber of the shield tunneling machine is effectively protected, thereby significantly prolonging the service life of the sensor. This not only reduces the maintenance cost of the shield tunneling machine, but also improves the overall working efficiency and safety of the shield tunneling machine.

[0039] Please focus on Figures 3 to 5 , the mounting mechanism 5 comprises a slot 501, the slot 501 is opened in the inner wall of the protector shell 1, the inner wall of the slot 501 is provided with a positioning groove 502, one end of the sealing fixed block 305 is rotatably connected with a rotating column 503, the outer wall of the rotating column 503 is fixedly connected with a first threaded rod 504, the outer wall of the first threaded rod 504 is connected with a push block 505, the push block 505 is slidably connected in the inside of the sealing fixed block 305, one end of the sealing fixed block 305 in the inside of the push block 505 is slidably connected with a positioning block 506, the first spring 507 is connected between the positioning block 506 and the sealing fixed block 305, the mounting mechanism 5 further comprises a threaded groove 508, the threaded groove 508 is opened in one end of the sealing fixed block 305 and located outside the rotating column 503, the inside of the threaded groove 508 is threadedly connected with a shielding cover 509, the outer wall of the shielding cover 509 is provided with a circular hole 510, the inner wall of the circular hole 510 is slidably connected with a cylinder 511, one end of the rotating column 503 is fixedly connected with a connecting plate 512, the outer wall of the connecting plate 512 is provided with a through hole 513.

[0040] In this embodiment: when installing the sealing fixed block 305, the sealing fixed block 305 is inserted into the slot 501, and then the rotating column 503 is rotated, the rotating column 503 drives the first threaded rod 504 to rotate, the first threaded rod 504 drives the push block 505 to displace, the push block 505 displaces the positioning block 506 to insert into the positioning groove 502, and the sealing fixed block 305 is fixed; then the shielding cover 509 is threadedly connected into the threaded groove 508, at this time the rotating direction of the threaded groove 508 is opposite to the rotating direction of the aforementioned first threaded rod 504, after completion, the cylinder 511 is installed into the circular hole 510, in this process, the cylinder 511 passes through the through hole 513, so as to fix between the rotating column 503 and the shielding cover 509, prevent the shielding cover 509 and the rotating column 503 from loosening during use, causing the sealing fixed block 305 to loosen.

[0041] Please focus on Figures 5 to 8The extrusion mechanism 6 comprises a pressing block 601 which is slidingly connected to the inside of the limiting block 402 and extends to the bottom end of the limiting block 402, the top end of the limiting block 402 is rotationally connected with a second threaded rod 602 which extends into the inside of the pressing block 601, the outer wall of the second threaded rod 602 is fixedly connected with a toothed disc 603, the inside of the limiting block 402 is slidingly connected with a horizontal plate 604 on one side of the toothed disc 603, the side of the horizontal plate 604 facing the toothed disc 603 is fixedly connected with a tooth block 605 and a pulling rod 606, the pulling rod 606 extends out of the limiting block 402, the extrusion mechanism 6 further comprises a vertical plate 607 which is slidingly connected to the inside of the limiting block 402 and extends above the limiting block 402, the second spring 608 is connected between the vertical plate 607 and the limiting block 402, the outer wall of the horizontal plate 604 is fixedly connected with a fixed rod 609, the outer wall of the vertical plate 607 is provided with an inclined groove 610, the fixed rod 609 is slidingly connected to the inner wall of the inclined groove 610, the inside of the protector shell 1 is provided with a movable groove 611 for the sliding of the limiting block 402 and the vertical plate 607, the third spring 612 is connected between the limiting block 402 and the movable groove 611, the top end of the movable groove 611 is fixedly connected with a clamping block 613, the inside of the protector shell 1 is slidingly connected with an extrusion rod 614, the top end of the extrusion rod 614 extends to the inner cavity of the insertion groove 501, the bottom end of the extrusion rod 614 extends to the inner wall of the movable groove 611, and the fourth spring 615 is connected between the extrusion rod 614 and the protector shell 1.

[0042] In the embodiment, when the sensor fixing base 401 is fixed, the second threaded rod 602 is rotated, the second threaded rod 602 drives the pressing block 601 to displace, and the displacement of the pressing block 601 extrudes the sensor fixing base 401, so that the sensor fixing base 401 is extruded and fixed.

[0043] When the sensor fixing base 401 is installed, the limiting block 402 can be pushed to slide towards the inside of the cylinder 511, the third spring 612 is extruded, the vertical plate 607 moves to contact and displace the clamping block 613, until the vertical plate 607 passes the clamping block 613, the vertical plate 607 is displaced to be engaged with the clamping block 613 under the action of the second spring 608, and the limiting block 402 is positioned in the cylinder 511, so as to prevent the limiting block 402 from blocking the installation of the sensor fixing base 401; after completion, the pulling rod 606 is pulled, the pulling rod 606 is displaced to drive the horizontal plate 604 to displace, the horizontal plate 604 is displaced to drive the fixed rod 609 to slide in the inclined groove 610, the vertical plate 607 is pushed to displace and separate from the clamping block 613, and the limiting block 402 is displaced to reset under the action of the third spring 612.

[0044] When the sensor is installed, the sealing fixing block 305 is installed into the slot 501, and the sealing fixing block 305 is in contact with the extrusion rod 614, the extrusion rod 614 is pushed to displace, the vertical plate 607 is pushed to displace through the fixed rod 609, the horizontal plate 604 is driven to displace, the tooth block 605 is driven to displace, the tooth block 605 is in engagement with the tooth disc 603, and rotation of the second threaded rod 602 is prevented, so that the sensor fixing base 401 is loosened during use of the protector shell 1, and the sensor is loosened.

[0045] Please refer to Figures 3 to 5 , the outer wall of the sealing fixing block 305 is in close contact with the inner wall of the slot 501, the outer wall of the pushing block 505 is provided with a first threaded hole, the first threaded hole is matched with the first threaded rod 504, one side of the positioning block 506 is provided with a first inclined surface, and the top outer wall of the positioning block 506 is in close contact with the inner wall of the positioning groove 502.

[0046] In this embodiment, the sealing fixing block 305 is inserted into the slot 501, and then the rotating column 503 is rotated, the rotating column 503 is rotated to drive the first threaded rod 504 to rotate, the first threaded rod 504 is rotated to drive the pushing block 505 to displace, and the pushing block 505 is displaced to drive the positioning block 506 to displace and be inserted into the positioning groove 502, so that the sealing fixing block 305 is fixed.

[0047] Please refer to Figures 3 to 5 , the inner wall of the shielding cover 509 is in close contact with the outer wall of the rotating column 503, the outer wall of the cylinder 511 is in close contact with the inner wall of the through hole 513, and the outer wall of the cylinder 511 is in close contact with the inner wall of the circular hole 510.

[0048] In this embodiment, the shielding cover 509 is then threadedly connected into the threaded groove 508, and after completion, the cylinder 511 is installed into the circular hole 510, in this process, the cylinder 511 passes through the through hole 513, so that the rotating column 503 and the shielding cover 509 are fixed, and loosening of the shielding cover 509 and the rotating column 503 during use is prevented, and loosening of the sealing fixing block 305 is caused.

[0049] Please refer to Figures 5 to 8 , the top end of the pressing block 601 is provided with a second threaded hole, and the second threaded hole is matched with the second threaded rod 602.

[0050] In this embodiment, the second threaded rod 602 is rotated, the second threaded rod 602 is rotated to drive the pressing block 601 to displace, and the pressing block 601 is displaced to extrude the sensor fixing base 401, so that the sensor fixing base 401 is extruded and fixed.

[0051] Please refer to Figures 5 to 8The outer wall of the fixed rod 609 is attached to the inner wall of the chute 610, and the second inclined surface is arranged on the side of the clamping block 613 facing the limiting block 402.

[0052] In the embodiment, the limiting block 402 is pushed to slide into the cylinder 511, the third spring 612 is pressed, the vertical plate 607 is displaced to contact the clamping block 613, the vertical plate 607 is displaced to be engaged with the clamping block 613 under the action of the second spring 608, the limiting block 402 is positioned in the cylinder 511, and the installation of the limiting block 402 on the sensor fixing base 401 is prevented from being shielded; after the completion, the pulling rod 606 is pulled, the pulling rod 606 is displaced to drive the horizontal plate 604 to be displaced, the horizontal plate 604 is displaced to drive the fixed rod 609 to slide in the chute 610, the vertical plate 607 is displaced to be separated from the clamping block 613, and the limiting block 402 is displaced to be reset under the action of the third spring 612.

[0053] Please refer to Figures 5 to 8 One end of the tooth block 605 is engaged with the tooth disc 603, and one end of the extrusion rod 614 in the inner cavity of the slot 501 is triangular.

[0054] In the embodiment, when the sealing fixing block 305 is installed into the slot 501, the sealing fixing block 305 contacts the extrusion rod 614, the extrusion rod 614 is displaced, the extrusion rod 614 is displaced to drive the vertical plate 607 to be displaced, the vertical plate 607 is displaced to drive the horizontal plate 604 to be displaced through the fixed rod 609, the horizontal plate 604 is displaced to drive the tooth block 605 to be displaced, the tooth block 605 is displaced to be engaged with the tooth disc 603, and the rotation of the second threaded rod 602 is prevented.

[0055] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A sensor protection device inside a soil chamber of a shield machine, characterized in that, The utility model provides a kind of protective cover, including the protective cover (1), the bottom end of the protective cover (1) is provided with link welding bevel (2), the top of the protective cover (1) is provided with sealing structure (3), the bottom of the protective cover (1) is provided with sensor fixing mechanism (4), the sealing structure (3) includes card holder (301), the card holder (301) is fixedly connected to the inner cavity of the protective cover (1), the top of the card holder (301) is provided with sealing rubber ring (302), the top of the sealing rubber ring (302) is provided with tempered glass transparent cover (303), the top of the tempered glass transparent cover (303) is provided with sealing compression ring (304), the inner cavity of the protective cover (1) is mounted with sealing fixed block (305), the sealing fixed block (305) is located at the top of the sealing compression ring (304), the sensor fixing mechanism (4) includes seat trapezoidal installation slot (403), the seat trapezoidal installation slot (403) is opened in the inner wall bottom end of the protective cover (1), sensor fixing base (401) is arranged on the seat trapezoidal installation slot (403), the bottom end of the sensor fixing base (401) is provided with trapezoidal bevel (405), sensor connecting hole (404) is opened in the top of the sensor fixing base (401), the inner cavity of the protective cover (1) is mounted with limit block (402) above the sensor fixing base (401), the sealing fixed block (305) is installed by mounting mechanism (5), the limit block (402) is fixed to the sensor fixing base (401) by extrusion mechanism (6); The mounting mechanism (5) includes slot (501), the slot (501) is opened in the inner wall of the protective cover (1), the inner wall of the slot (501) is opened with positioning groove (502), one end of the sealing fixed block (305) is rotatably connected with rotating column (503), the outer wall of the rotating column (503) is fixedly connected with first threaded rod (504), the outer wall of the first threaded rod (504) is connected with push block (505), the push block (505) is slidably connected in the inside of the sealing fixed block (305), the inside of the sealing fixed block (305) is slidably connected with positioning block (506) at one end of the push block (505), the first spring (507) is connected between the positioning block (506) and the sealing fixed block (305). The mounting mechanism (5) further comprises a threaded groove (508) opened at one end of the sealing fixed block (305) and located outside the rotating column (503), the threaded groove (508) is internally threadedly connected with a shielding cover (509), the outer wall of the shielding cover (509) is provided with a circular hole (510), the inner wall of the circular hole (510) is slidably connected with a cylinder (511), one end of the rotating column (503) is fixedly connected with a connecting plate (512), and the outer wall of the connecting plate (512) is provided with a through hole (513).

2. The sensor protection device for the inside of the soil chamber of a shield tunneling machine according to claim 1, characterized in that, The extrusion mechanism (6) comprises a lower pressing block (601) which is slidably connected in the inside of the limiting block (402) and extends to the bottom end of the limiting block (402), the top end of the limiting block (402) is rotatably connected with a second threaded rod (602) extending into the inside of the lower pressing block (601), the outer wall of the second threaded rod (602) is fixedly connected with a toothed disc (603), the inside of the limiting block (402) is slidably connected with a horizontal plate (604) on one side of the toothed disc (603), the side of the horizontal plate (604) facing the toothed disc (603) is fixedly connected with a toothed block (605) and a pulling rod (606), and the pulling rod (606) extends out of the limiting block (402).

3. The sensor protection device for the inside of the soil chamber of a shield tunneling machine according to claim 2, characterized in that, The extrusion mechanism (6) further comprises a vertical plate (607) which is slidably connected in the inside of the limiting block (402) and extends above the limiting block (402), a second spring (608) is connected between the vertical plate (607) and the limiting block (402), the outer wall of the horizontal plate (604) is fixedly connected with a fixed rod (609), the outer wall of the vertical plate (607) is provided with an inclined groove (610), the fixed rod (609) is slidably connected with the inner wall of the inclined groove (610), the inside of the protector shell (1) is provided with a movable groove (611) for sliding of the limiting block (402) and the vertical plate (607), a third spring (612) is connected between the limiting block (402) and the movable groove (611), the top end of the movable groove (611) is fixedly connected with a clamping block (613), the inside of the protector shell (1) is slidably connected with an extrusion rod (614), the top end of the extrusion rod (614) extends to the inner cavity of the insertion groove (501), the bottom end of the extrusion rod (614) extends to the inner wall of the movable groove (611), and a fourth spring (615) is connected between the extrusion rod (614) and the protector shell (1).

4. The sensor protection device for the inside of the soil chamber of a shield tunneling machine according to claim 1, characterized in that, The outer wall of the sealing fixed block (305) is fitted with the inner wall of the insertion groove (501), the outer wall of the pushing block (505) is provided with a first threaded hole matched with the first threaded rod (504), one side of the positioning block (506) is provided with a first inclined surface, and the top outer wall of the positioning block (506) is fitted with the inner wall of the positioning groove (502).

5. The sensor protection device for the inside of the soil chamber of a shield tunneling machine according to claim 1, characterized in that, The inner wall of the shielding cover (509) is attached to the outer wall of the rotating column (503), the outer wall of the cylinder (511) is attached to the inner wall of the through hole (513), and the outer wall of the cylinder (511) is tightly attached to the inner wall of the round hole (510).

6. The sensor protection device for the inside of the soil chamber of a shield tunneling machine according to claim 3, characterized in that, The top end of the lower pressing block (601) is provided with a second threaded hole matched with the second threaded rod (602).

7. The sensor protection device for the inside of the soil chamber of a shield tunneling machine according to claim 3, characterized in that, The outer wall of the fixing rod (609) is attached to the inner wall of the chute (610), and the side of the clamping block (613) facing the limiting block (402) is provided with a second inclined surface.

8. The sensor protection device for the inside of the soil chamber of a shield tunneling machine according to claim 3, characterized in that, One end of the tooth block (605) is clamped with the tooth disc (603), and one end of the extrusion rod (614) in the inner cavity of the insertion slot (501) is triangular.

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