Wireless transmission type highway subgrade crack monitoring sensor and use method thereof

Abstract

The invention discloses a wireless transmission type highway subgrade crack monitoring sensor and a use method thereof, and relates to the technical field of highway subgrade monitoring, the wireless transmission type highway subgrade crack monitoring sensor comprises a monitoring mechanism, and a subgrade crack monitoring sensing mechanism is arranged on the monitoring mechanism. According to the wireless transmission type highway subgrade crack monitoring sensor, the flexible substrate is taken out from the interior of the placement groove, the flexible substrate is electrically connected with the mainboard in the outer shell through the connecting strip, the connecting rail groove and the transmission line, the signal data transmission function is achieved, and the multiple strain gauge type sensors distributed on the flexible substrate in an adhesive mode are electrically connected with the mainboard in the outer shell through the transmission line. The strain gauge type sensor is tightly attached to the surface of a highway subgrade through a special adhesive, then micro strain generated by highway subgrade cracks is accurately measured, the two ends of the connecting rail groove are provided with an electric butt joint opening and a positioning butt joint hole, the extending rail groove can be conveniently extended, electric connection is formed, a flexible substrate with a larger size can be conveniently replaced, and the flexibility of the highway subgrade is improved. And the change according to the crack monitoring requirement is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of highway roadbed monitoring, and in particular to a wireless transmission type highway roadbed crack monitoring sensor and a use method thereof. Background Art

[0002] During the long-term use of highways, cracks are likely to appear on the roadbed due to the influence of vehicle loads and natural environmental factors (such as temperature changes, rain erosion, etc.). Roadbed cracks not only affect the normal use of the highway and reduce driving comfort, but may also cause more serious road damage and even endanger the structural safety of the highway. Therefore, timely and accurate monitoring of roadbed cracks is of great significance.

[0003] Although the existing roadbed crack monitoring sensors are capable of monitoring cracks, they cannot be changed according to the size requirements of crack monitoring during sensor installation, resulting in insufficient monitoring range.

[0004] Therefore, we propose a wireless transmission type highway roadbed crack monitoring sensor and its use method to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a wireless transmission type highway roadbed crack monitoring sensor and its use method, so as to solve the problem that the sensor monitoring proposed in the above background technology cannot be changed according to the size requirements of crack monitoring during installation, resulting in insufficient monitoring range.

[0006] To achieve the above object, the present invention provides the following technical solutions: a wireless transmission type highway roadbed crack monitoring sensor, comprising a monitoring mechanism, a roadbed crack monitoring sensor mechanism is arranged on the monitoring mechanism, a cleaning mechanism is arranged at the bottom of the monitoring mechanism, the monitoring mechanism comprises an outer shell, a main board is arranged on the inner side of the outer shell, and a data acquisition module, a microprocessor and a wireless transmission module are arranged at the bottom of the main board; The roadbed crack monitoring sensor mechanism includes a flexible substrate and an extended rail groove, the extended rail groove is arranged at both ends of the flexible substrate, a number of strain gauge sensors are evenly distributed on the bottom of the flexible substrate, a connecting strip is fixedly connected to one side of the flexible substrate, a connecting rail groove is movably sleeved on the outer side of the connecting strip, a connecting groove is provided on the inner side of the connecting rail groove, an electrical docking interface and a positioning docking hole are provided at both ends of the connecting rail groove, an electrical docking joint and a positioning rod are fixedly connected to one end of the extended rail groove, the positioning docking holes are provided at four corners at both ends of the connecting rail groove, the positioning rod is fixedly connected to the four corners at one end of the extended rail groove, the electrical docking joint is connected to the inner side of the electrical docking interface, a transmission line is fixedly connected to one side of the connecting strip, and one end of the transmission line is connected to the inside of the outer shell.

[0007] Preferably, the cleaning mechanism comprises a spray rack, a plurality of high-pressure spray heads are evenly distributed along a straight line on both sides of the bottom of the spray rack, and a hose is fixedly connected to one side of the spray rack.

[0008] Preferably, one end of the hose is fixedly connected to an air pump, a pressure tank is arranged on the side of the air pump, and a support plate is arranged on the bottom of the pressure tank.

[0009] Preferably, sliding blocks are provided at both ends of the spray rack, the outer side of the sliding block is slidably connected to a sliding rail, a screw rod is provided on the inner side of a single sliding rail, the screw rod is threadedly connected to the inner side of the sliding block, a motor is provided at one end of the screw rod, and the motor is arranged at one end of the inner side of the single sliding rail.

[0010] Preferably, a fastener is movably mounted on one side of the extended rail groove, a docking buckle is fixedly mounted on one side of the connecting rail groove, and one end of the fastener is snap-fitted and connected to the inner side of the docking buckle.

[0011] Preferably, a spring member is movably connected to the side surface of the snap member, and one end of the spring member is movably connected to the inner side of one end of the extended rail groove.

[0012] Preferably, a cover is movably mounted on the top of the outer shell, a sensor controller is arranged on the inner side of the outer shell, and a power module is arranged on the bottom of the mainboard.

[0013] Preferably, a bottom plate is installed at the bottom of the outer shell, and supporting feet are fixedly installed at the four corners of the bottom of the bottom plate. A placement groove is provided on the inner side of the outer shell, and the placement groove is provided on the side of the sensor controller.

[0014] A method for using a wireless transmission type highway roadbed crack monitoring sensor comprises the following steps: S1. Place the outer shell at the crack position that needs to be monitored, control the operation of the air pump and air pressure tank through the sensor controller, compress the generated gas and then transport it to the position of the spray rack through a hose, and spray it evenly and at high pressure through a high-pressure nozzle. Use the gas pressure sprayed by the high-pressure nozzle to clean the crack position that needs to be monitored with high-pressure jet, so that the dust on the surface can be effectively cleaned.

[0015] S2. During the jet cleaning process, the motor drives the screw to rotate, thereby driving the sliding block to slide and adjust on the inner side of the sliding rail, effectively driving the spray rack to achieve the function of synchronous sliding adjustment, which is conducive to driving the high-pressure nozzle to move further through the movement of the spray rack, thereby achieving a wider range of cleaning functions.

[0016] S3. After cleaning, move the outer shell to one side, open the cover, and take out the flexible substrate from the inside of the placement slot. The flexible substrate is electrically connected to the main board in the outer shell through the connecting strip, the connecting rail groove and the transmission line to realize the signal data transmission function.

[0017] S4. Multiple strain gauge sensors are bonded and distributed on a flexible substrate, and a special adhesive is used to tightly fit the strain gauge sensors to the surface of the highway subgrade, thereby accurately measuring the tiny strains caused by cracks in the subgrade.

[0018] S5. The measured data is transmitted to the data acquisition module. The data acquisition module collects the strain data measured by the strain gauge sensor body and converts it into digital signals for transmission to the microprocessor. The microprocessor processes and analyzes the received digital signals, calculates the relevant information of the cracks, and transmits this information to the remote monitoring center through the wireless transmission module. At the same time, the sensor controller can control and view the data. The power module uses a rechargeable lithium battery and is equipped with an efficient power management circuit, which can perform intelligent charging and discharging management of the battery.

[0019] S6. Electrical docking interfaces and positioning docking holes are provided at both ends of the connecting rail groove to facilitate the extension of the extended rail groove and form an electrical connection, which is convenient for replacing a flexible substrate with a larger size, and helps to increase the scope of use. When connecting, the fastener and the docking buckle are plugged into each other, and at the same time, the elastic push of the spring part makes the fastener fastened to the docking buckle to ensure the stability of the connection.

[0020] S7. After the monitoring is completed, the connecting rail groove and the extended rail groove are disassembled and separated, so that part of the roadbed crack monitoring sensor mechanism can be stored inside the placement groove, and the cover body is closed so that the monitoring equipment is placed inside the outer shell, which is convenient for transportation and carrying.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. By taking out the flexible substrate from the inside of the placement groove, the flexible substrate is electrically connected to the main board in the outer shell through the connecting strip, the connecting rail groove and the transmission line to realize the signal data transmission function, and a plurality of strain gauge sensors are bonded and distributed on the flexible substrate, and the strain gauge sensors are tightly attached to the surface of the highway subgrade by using a special adhesive, so as to accurately measure the tiny strain caused by the cracks in the subgrade. Electrical docking interfaces and positioning docking holes are provided at both ends of the connecting rail groove to facilitate the extension of the extended rail groove and form an electrical connection, so as to facilitate the replacement of a larger flexible substrate, which helps to expand the scope of use and is conducive to changes according to the needs of crack monitoring; 2. The air pump and air pressure tank are controlled by the sensor controller to generate pressurized gas and temporarily store it in the air pressure tank. The generated gas is compressed and then transported to the spray rack through a hose. The high-pressure nozzle sprays it evenly and at high pressure. The gas pressure sprayed by the high-pressure nozzle is used to clean the crack positions that need to be monitored with high-pressure jets, so that the dust on the surface can be effectively cleaned. The motor drives the screw to rotate, which in turn drives the sliding block to slide and adjust on the inner side of the sliding rail, effectively driving the spray rack to realize the function of synchronous sliding adjustment, which is conducive to further moving the high-pressure nozzle through the movement of the spray rack, thereby realizing a wider range of cleaning functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of a wireless transmission type highway roadbed crack monitoring sensor of the present invention; Figure 2 It is a schematic diagram of the structure of a wireless transmission type highway roadbed crack monitoring sensor of the present invention from another angle; Figure 3 It is a schematic diagram of a partially exploded structure of a wireless transmission type highway roadbed crack monitoring sensor of the present invention; Figure 4 For the present invention Figure 3 A is an enlarged structural diagram; Figure 5 It is a schematic diagram of the structure of the installation components of a wireless transmission type highway roadbed crack monitoring sensor of the present invention; Figure 6 This is a schematic diagram of the decomposed structure of a wireless transmission type highway roadbed crack monitoring sensor of the present invention; Figure 7 The present invention is a schematic diagram of the cleaning mechanism structure of a wireless transmission type highway roadbed crack monitoring sensor.

[0023] In the figure: 1. Monitoring mechanism; 101. Outer shell; 102. Cover; 103. Sensor controller; 104. Main board; 105. Data acquisition module; 106. Microprocessor; 107. Wireless transmission module; 108. Power module; 109. Bottom plate; 110. Placement slot; 2. Roadbed crack monitoring sensor mechanism; 201. Flexible substrate; 202. Strain gauge sensor; 203. Connecting strip; 204. Connecting rail groove; 205. Connecting groove; 2 06. Electrical docking port; 207. Positioning docking hole; 208. Extended rail groove; 209. Electrical docking joint; 210. Positioning rod; 211. Fastener; 212. Docking buckle; 213. Spring member; 214. Transmission line; 3. Cleaning mechanism; 301. Spray rack; 302. High-pressure nozzle; 303. Hose; 304. Air pump; 305. Air pressure tank; 306. Sliding block; 307. Sliding rail; 308. Screw rod; 309. Motor. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1: Please refer to Figure 1-Figure 7 The present invention provides a technical solution: a wireless transmission type highway roadbed crack monitoring sensor, comprising a monitoring mechanism 1, a roadbed crack monitoring sensor mechanism 2 is arranged on the monitoring mechanism 1, a cleaning mechanism 3 is arranged at the bottom of the monitoring mechanism 1, the monitoring mechanism 1 comprises an outer shell 101, a main board 104 is arranged on the inner side of the outer shell 101, a data acquisition module 105, a microprocessor 106 and a wireless transmission module 107 are arranged at the bottom of the main board 104, the measured data is transmitted to the data acquisition module 105, the strain data measured by the strain gauge sensor 202 body is collected by the data acquisition module 105, and the strain data is converted into a digital signal and transmitted to the microprocessor 106, the microprocessor 106 processes and analyzes the received digital signal, calculates the relevant information of the crack, and transmits the information to the remote monitoring center through the wireless transmission module 107; The roadbed crack monitoring sensor mechanism 2 includes a flexible substrate 201 and an extended rail groove 208. The extended rail groove 208 is arranged at both ends of the flexible substrate 201. A plurality of strain gauge sensors 202 are evenly distributed on the bottom of the flexible substrate 201. A connecting strip 203 is fixedly connected to one side of the flexible substrate 201. A connecting rail groove 204 is movably sleeved on the outer side of the connecting strip 203. A connecting groove 205 is provided on the inner side of the connecting rail groove 204. Electrical docking interfaces are provided at both ends of the connecting rail groove 204. 206 and positioning docking hole 207, one end of the extended rail groove 208 is fixedly connected with an electrical docking joint 209 and a positioning rod 210, the positioning docking holes 207 are opened at the four corners of the two ends of the connecting rail groove 204, the positioning rod 210 is fixedly connected to the four corners of one end of the extended rail groove 208, the electrical docking joint 209 is connected to the inner side of the electrical docking port 206, one side of the connecting bar 203 is fixedly connected with a transmission line 214, one end of the transmission line 214 is connected to the inside of the outer shell 101, and the flexible The substrate 201 is taken out from the inside of the placement groove 110, and the flexible substrate 201 is electrically connected to the main board 104 in the outer shell 101 through the connecting strip 203, the connecting rail groove 204 and the transmission line 214 to realize the signal data transmission function. A plurality of strain gauge sensors 202 are bonded and distributed on the flexible substrate 201, and the strain gauge sensors 202 are tightly attached to the surface of the highway roadbed with a special adhesive, so as to accurately measure the tiny strain caused by the cracks in the roadbed. Electrical docking interfaces 206 and positioning docking holes 207 are provided at both ends of the connecting rail groove 204 to facilitate the extension of the extended rail groove 208 and form an electrical connection, so as to facilitate the replacement of a larger flexible substrate 201, which helps to increase the scope of use and is conducive to changes according to the needs of crack monitoring. When connecting, the snap-on member 211 and the docking buckle 212 are plugged and connected, and at the same time, the snap-on member 211 is fastened to the docking buckle 212 with the elastic push of the spring member 213 to ensure the stability of the connection.

[0026] like Figure 7 As shown, the cleaning mechanism 3 includes a spray rack 301, and a plurality of high-pressure nozzles 302 are evenly distributed along a straight line on both sides of the bottom of the spray rack 301. A hose 303 is fixedly connected to one side of the spray rack 301. The generated gas is compressed and then transported to the position of the spray rack 301 through the hose 303. The high-pressure nozzle 302 sprays it out evenly and at high pressure. The gas pressure sprayed by the high-pressure nozzle 302 is used to perform high-pressure jet cleaning on the crack position that needs to be monitored, so that the dust on the surface can be effectively cleaned.

[0027] like Figure 7 As shown, one end of the hose 303 is fixedly connected to an air pump 304, a pressure tank 305 is arranged on the side of the air pump 304, and a support plate is arranged at the bottom of the pressure tank 305. The air pump 304 and the pressure tank 305 are controlled to operate by the sensor controller 103, thereby generating pressurized gas and temporarily storing it through the pressure tank 305.

[0028] like Figure 7 As shown, sliding blocks 306 are provided at both ends of the spray rack 301, and the outer side of the sliding block 306 is slidably connected to a sliding rail 307, and a screw rod 308 is provided on the inner side of a single sliding rail 307. The screw rod 308 is threadedly connected to the inner side of the sliding block 306, and a motor 309 is provided at one end of the screw rod 308. The motor 309 is arranged at one end of the inner side of the single sliding rail 307. The motor 309 drives the screw rod 308 to rotate, thereby driving the sliding block 306 to slide and adjust on the inner side of the sliding rail 307, effectively driving the spray rack 301 to realize the function of synchronous sliding adjustment, which is beneficial to drive the high-pressure nozzle 302 to move further through the movement of the spray rack 301, so as to realize a cleaning function in a larger range.

[0029] like Figure 4 As shown, a fastener 211 is movably installed on one side of the extended rail groove 208, and a docking buckle 212 is fixedly installed on one side of the connecting rail groove 204. One end of the fastener 211 is snap-fitted and connected to the inner side of the docking buckle 212. The fastener 211 and the docking buckle 212 are plug-connected, and at the same time, the elastic push of the spring member 213 makes the fastener 211 fastened to the docking buckle 212 to ensure the stability of the connection.

[0030] like Figure 5 As shown, a spring member 213 is movably connected to the side of the latch member 211, and one end of the spring member 213 is movably connected to the inner side of one end of the extended rail groove 208. The spring member 213 provides a driving force, which helps to ensure a stable connection.

[0031] like Figure 1 and Figure 6 As shown, a cover body 102 is movably installed on the top of the outer shell 101, a sensor controller 103 is arranged on the inner side of the outer shell 101, and a power module 108 is arranged on the bottom of the main board 104. The sensor controller 103 can control and view the data status. The power module 108 adopts a rechargeable lithium battery and is equipped with an efficient power management circuit, which can perform intelligent charging and discharging management of the battery.

[0032] like Figure 1 and Figure 6 As shown, a bottom plate 109 is installed at the bottom of the outer shell 101, and supporting feet are fixedly installed at the four corners of the bottom of the bottom plate 109. A placement groove 110 is provided on the inner side of the outer shell 101, and the placement groove 110 is arranged on the side of the sensor controller 103. The bottom plate 109 provides an installation seal at the bottom of the outer shell 101. The placement groove 110 provides a space for placing part of the roadbed crack monitoring sensor mechanism 2, thereby improving the convenience of use.

[0033] The working principle of the entire mechanism is as follows: the outer shell 101 is placed at the crack position that needs to be monitored, and the air pump 304 and the air pressure tank 305 are controlled to operate through the sensor controller 103, and the generated gas is compressed and then transported to the position of the spray rack 301 through the hose 303, and evenly sprayed out at high pressure through the high-pressure nozzle 302. The gas pressure sprayed by the high-pressure nozzle 302 is used to perform high-pressure jet cleaning on the crack position that needs to be monitored, so that the dust on the surface can be effectively cleaned. During the jet cleaning process, the motor 309 drives the screw rod 308 to rotate, thereby driving the sliding block 306 to slide and adjust on the inner side of the sliding rail 307, effectively driving the spray rack 301 to realize the function of synchronous sliding adjustment, which is conducive to driving the high-pressure nozzle 302 to move further through the movement of the spray rack 301, thereby realizing a cleaning function over a larger range.

[0034] After cleaning, the outer shell 101 is moved to one side, the cover 102 is opened, and the flexible substrate 201 is taken out from the inside of the placement groove 110. The flexible substrate 201 is electrically connected to the main board 104 in the outer shell 101 through the connecting strip 203, the connecting rail groove 204 and the transmission line 214 to realize the signal data transmission function. A plurality of strain gauge sensors 202 are bonded and distributed on the flexible substrate 201, and the strain gauge sensors 202 are tightly attached to the surface of the highway subgrade by using a special adhesive, so as to accurately measure the tiny strain caused by the cracks in the subgrade. The measured data is transmitted to the The data is input to the data acquisition module 105, which collects the strain data measured by the strain gauge sensor 202 body and converts it into a digital signal for transmission to the microprocessor 106. The microprocessor 106 processes and analyzes the received digital signal, calculates the relevant information of the crack, and transmits this information to the remote monitoring center through the wireless transmission module 107. At the same time, the sensor controller 103 can control and view the data status. The power module 108 uses a rechargeable lithium battery and is equipped with an efficient power management circuit, which can perform intelligent charging and discharging management of the battery.

[0035] Electrical docking interfaces 206 and positioning docking holes 207 are provided at both ends of the connecting rail groove 204 to facilitate the extension of the extended rail groove 208 and form an electrical connection, which is convenient for replacing the flexible substrate 201 with a larger size, and helps to increase the scope of use. When connecting, the snap-on component 211 and the docking buckle 212 are plugged into each other, and at the same time, the elastic push of the spring component 213 is used to fasten the snap-on component 211 to the docking buckle 212 to ensure the stability of the connection. When the monitoring is completed, the connecting rail groove 204 and the extended rail groove 208 are disassembled and separated, which facilitates the storage of part of the roadbed crack monitoring sensor mechanism 2 into the placement groove 110, and the cover body 102 is closed so that the monitored equipment is placed in the interior of the outer shell 101, which is convenient for carrying.

[0036] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wireless transmission type highway roadbed crack monitoring sensor, comprising a monitoring mechanism (1), characterized in that: The monitoring mechanism (1) is provided with a roadbed crack monitoring sensor mechanism (2), the bottom of the monitoring mechanism (1) is provided with a cleaning mechanism (3), the monitoring mechanism (1) comprises an outer shell (101), a main board (104) is provided on the inner side of the outer shell (101), and a data acquisition module (105), a microprocessor (106) and a wireless transmission module (107) are provided at the bottom of the main board (104); The roadbed crack monitoring sensor mechanism (2) comprises a flexible substrate (201) and an extended rail groove (208), wherein the extended rail groove (208) is arranged at both ends of the flexible substrate (201), a plurality of strain gauge sensors (202) are evenly distributed on the bottom of the flexible substrate (201), a connecting strip (203) is fixedly connected to one side of the flexible substrate (201), a connecting rail groove (204) is movably sleeved on the outer side of the connecting strip (203), a connecting groove (205) is provided on the inner side of the connecting rail groove (204), and electrical contact pins are provided at both ends of the connecting rail groove (204). An interface (206) and a positioning docking hole (207), one end of the extended rail groove (208) is fixedly connected to an electrical docking joint (209) and a positioning rod (210), the positioning docking holes (207) are opened at the four corners of both ends of the connecting rail groove (204), the positioning rod (210) is fixedly connected to the four corners of one end of the extended rail groove (208), the electrical docking joint (209) is connected to the inner side of the electrical docking interface (206), one side of the connecting strip (203) is fixedly connected to a transmission line (214), and one end of the transmission line (214) is connected to the inside of the outer shell (101).

2. The wireless transmission type highway roadbed crack monitoring sensor according to claim 1 is characterized in that: The cleaning mechanism (3) comprises a spray rack (301), a plurality of high-pressure spray heads (302) are evenly distributed along a straight line on both sides of the bottom of the spray rack (301), and a hose (303) is fixedly connected to one side of the spray rack (301).

3. The wireless transmission type highway roadbed crack monitoring sensor according to claim 2 is characterized in that: One end of the hose (303) is fixedly connected to an air pump (304), a pressure tank (305) is arranged on the side of the air pump (304), and a support plate is arranged at the bottom of the pressure tank (305).

4. The wireless transmission type highway roadbed crack monitoring sensor according to claim 3 is characterized in that: Sliding blocks (306) are provided at both ends of the spray rack (301); the outer side of the sliding block (306) is slidably connected to a sliding rail (307); a screw rod (308) is provided on the inner side of a single sliding rail (307); the screw rod (308) is threadedly connected to the inner side of the sliding block (306); a motor (309) is provided at one end of the screw rod (308); and the motor (309) is arranged at one end of the inner side of the single sliding rail (307).

5. The wireless transmission type highway roadbed crack monitoring sensor according to claim 4 is characterized in that: A snap-fitting piece (211) is movably mounted on one side of the extended rail groove (208), a docking buckle (212) is fixedly mounted on one side of the connecting rail groove (204), and one end of the snap-fitting piece (211) is snap-fitted and connected to the inner side of the docking buckle (212).

6. The wireless transmission type highway roadbed crack monitoring sensor according to claim 5 is characterized in that: A spring member (213) is movably connected to the side of the buckle member (211), and one end of the spring member (213) is movably connected to the inner side of one end of the extended rail groove (208).

7. The wireless transmission type highway roadbed crack monitoring sensor according to claim 6 is characterized in that: A cover body (102) is movably mounted on the top of the outer shell (101), a sensor controller (103) is arranged on the inner side of the outer shell (101), and a power module (108) is arranged on the bottom of the mainboard (104).

8. The wireless transmission type highway roadbed crack monitoring sensor according to claim 7 is characterized in that: A bottom plate (109) is installed at the bottom of the outer shell (101), and support feet are fixedly installed at the four corners of the bottom of the bottom plate (109). A placement groove (110) is provided on the inner side of the outer shell (101), and the placement groove (110) is arranged on the side of the sensor controller (103).

9. A method for using a wireless transmission type highway roadbed crack monitoring sensor, characterized in that: The wireless transmission type highway roadbed crack monitoring sensor according to claim 8 is used, comprising the following steps: S1. The outer shell (101) is placed at the crack position to be monitored, and the air pump (304) and the air pressure tank (305) are controlled by the sensor controller (103) to operate, and the generated gas is compressed and then transported to the position of the spray rack (301) through the hose (303), and is uniformly sprayed with high pressure through the high-pressure nozzle (302). The crack position to be monitored is cleaned with high-pressure jet by utilizing the gas pressure sprayed by the high-pressure nozzle (302), so that the dust on the surface is effectively cleaned; S2. During the jet cleaning process, the motor (309) drives the screw rod (308) to rotate, thereby driving the sliding block (306) to slide and adjust on the inner side of the sliding rail (307), effectively driving the spray rack (301) to achieve a synchronous sliding adjustment function, which is conducive to driving the high-pressure spray head (302) to move further through the movement of the spray rack (301), thereby achieving a cleaning function over a wider range; S3, after the cleaning is completed, the outer shell (101) is moved to one side, the cover (102) is opened, and the flexible substrate (201) is taken out from the inside of the placement groove (110), and the flexible substrate (201) is electrically connected to the main board (104) in the outer shell (101) through the connecting strip (203), the connecting rail groove (204) and the transmission line (214), so as to realize the signal data transmission function; S4, bonding a plurality of strain gauge sensors (202) distributed on the flexible substrate (201), and using a special adhesive to tightly adhere the strain gauge sensors (202) to the surface of the highway subgrade, thereby accurately measuring the micro strain generated by cracks in the subgrade; S5, the measured data is transmitted to the data acquisition module (105), the strain data measured by the strain gauge sensor (202) body is collected by the data acquisition module (105), and the data is converted into a digital signal and transmitted to the microprocessor (106), the microprocessor (106) processes and analyzes the received digital signal, calculates relevant information of the crack, and transmits the information to the remote monitoring center through the wireless transmission module (107), and the sensor controller (103) can control and view the data at the same time, the power module (108) uses a rechargeable lithium battery and is equipped with an efficient power management circuit, which can perform intelligent charging and discharging management on the battery; S6. Electrical docking interfaces (206) and positioning docking holes (207) are provided at both ends of the connecting rail groove (204) to facilitate the extension of the extension rail groove (208) and form an electrical connection, so as to facilitate the replacement of a larger flexible substrate (201), thereby helping to increase the scope of use. When connecting, the buckle (211) and the docking buckle (212) are plugged and connected, and at the same time, the buckle (211) is fastened to the docking buckle (212) in cooperation with the elastic push of the spring member (213) to ensure the stability of the connection; S7. After the monitoring is completed, the connecting rail groove (204) and the extended rail groove (208) are disassembled and separated, so that part of the roadbed crack monitoring sensor mechanism (2) can be stored inside the placement groove (110), and the cover body (102) is closed so that all the monitoring equipment can be placed inside the outer shell (101), which is convenient for transportation and carrying.

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