A soil layer temperature detection device and its application in a model tank experimental system

Abstract

The invention relates to the technical field of geotechnical engineering, and discloses a soil layer temperature detection device and an application in a model tank experimental system. The device comprises a temperature detection component and a model tank body, wherein the temperature detection component is located at the top of the model tank body and is used to cooperate with the model tank body to detect the temperature of the soil body. The temperature detection component comprises a test plate, and a driving motor is arranged on the top of the test plate. The invention provides mutual cooperation among components such as a conveying pipe, a conveying channel and a fin sleeve, and utilizes the mutual cooperation between the conveying pipe and the conveying channel, so that the fin sleeve is always located in a receiving groove on a temperature measuring tube during the insertion process. In this way, during the insertion of the temperature measuring tube into the soil layer, the fin sleeve and the temperature sensor will not frequently collide and rub with the soil body, thereby achieving the purpose of protecting the fin sleeve and the temperature sensor, and avoiding the breakage and damage of the fin sleeve and the temperature sensor during the insertion of the temperature measuring tube.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, and in particular to a soil layer temperature detection device and an application thereof in a model tank experimental system. Background Art

[0002] With the acceleration of the pace of urban construction in my country, super-large and super-high buildings continue to emerge, and the topic of building foundations has become a current research hotspot. Since model tests can well simulate and predict the stress and deformation of building sites, they have become an effective way of current research. The model trough test system in the model test is the main indoor model test carrier for related topics in the field of geotechnical engineering. At the same time, a soil layer temperature detection device is also needed to detect the temperature of the soil filled in the model trough.

[0003] The Chinese patent application number 201521112992.3 discloses a temperature measuring device for measuring the internal temperature of frozen soil, including a drill bit, a temperature measuring tube, a hole plate, a thermocouple, a tin block and a shielded wire. The thermocouple is welded to the tin block, and then the tin block is welded to the wall of the temperature measuring tube. The thermocouple and the temperature measuring tube are connected together through the tin block, which reduces the transfer process between the coldness of the soil and the wall of the temperature measuring tube, and the coldness of the soil can be transferred to the thermocouple to measure the soil temperature, thereby reducing the measurement error.

[0004] In the above-mentioned prior art, it is found that the temperature measuring tubes used in engineering are all steel tubes. Steel tubes have the advantages of easy construction and fast heat transfer. Although steel tubes can quickly reflect the temperature of frozen soil, they also make the temperatures of different temperature measuring points along the steel tube axis wall affect each other, that is, the temperatures of different measuring points are difficult to reflect the temperature of the corresponding soil. Usually, the temperature sensor is designed inside the temperature measuring tube. In addition, when the temperature measuring tube is empty, the temperature sensor inside it is difficult to contact the wall of the temperature measuring tube, thereby affecting the accuracy of temperature measurement. At the same time, when the soil is in the freezing experiment, the soil will expand, and at the same time, the squeezing force is applied to the wall of the temperature measuring tube, causing the temperature measuring tube to deform or crack, which seriously affects the temperature detection data.

[0005] Therefore, it is necessary to solve the above problems through a soil temperature detection device and its application in a model tank experimental system. Summary of the invention

[0006] The purpose of the present invention is to provide a soil layer temperature detection device and its application in a model tank experimental system to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a soil layer temperature detection device, comprising a temperature detection component and a model tank body, wherein the temperature detection component is located at the top of the model tank body, and the temperature detection component is used to cooperate with the model tank body to detect the temperature of the soil, and the temperature detection component comprises a test plate, a driving motor is provided on the top of the test plate, and the driving motor is fixedly connected to the test plate through a support, a transmission shaft is provided at the output end of the driving motor, and a temperature measuring tube is provided at the other end of the transmission shaft, a fin sleeve is provided on the outer side of the temperature measuring tube, and a temperature sensor for measuring the soil is provided inside the fin sleeve;

[0008] The model trough body includes a model trough frame, and the four sides of the model trough frame are provided with model plates corresponding to each other. The four model plates are connected to the model trough frame to form a container for soil experiments. The model trough frame is respectively provided with transverse reinforcement ribs and longitudinal reinforcement ribs through the model plates, and the transverse reinforcement ribs and longitudinal reinforcement ribs are used to fix the model plates.

[0009] Preferably, an air supply channel is provided inside the temperature measuring tube, and the temperature measuring tube is communicated with the fin sleeve through the air supply channel. A signal line is provided on one side of the temperature sensor, and a circuit channel is opened in the middle of the temperature measuring tube. The signal line passes through the fin sleeve and is arranged inside the circuit channel. The fin sleeve and the air supply channel are communicated with each other, and an air valve is provided at the connection between the air supply channel and the fin sleeve.

[0010] Preferably, a receiving groove is provided on the outer surface of the temperature measuring tube, the shape of which is matched with the fin sleeve, an elastic part is provided at the bottom of the temperature measuring tube, a rubber pad is provided at one end of the elastic part away from the temperature measuring tube, the shape of the rubber pad is set to be conical, an accommodating space is provided inside the elastic part, and the elastic part is connected with the circuit channel.

[0011] Preferably, a rotating plate is provided on the side of the test plate close to the delivery pipe, and the rotating plate is movably connected to the test plate. A delivery pipe is provided at the top of the gas delivery channel in the temperature measuring tube, and the delivery pipe and the gas delivery channel are interconnected. One end of the delivery pipe away from the temperature measuring tube passes through the rotating plate, and the interior of the rotating plate is interconnected with the outer surface of the transmission shaft.

[0012] Preferably, a connecting piece for fixing is disposed oppositely on one side of the model slot frame, a reinforcing plate is disposed between two oppositely disposed connecting pieces, and the reinforcing plate is transversely disposed between the two connecting pieces;

[0013] One side of the reinforcement plate is provided with a threaded rod, the number of the threaded rods is two, each of the threaded rods is symmetrically arranged on one side of the reinforcement plate, and the end of each threaded rod away from the reinforcement plate is provided with the same adjustment plate, and the adjustment plate is movably arranged inside the model slot frame.

[0014] Preferably, a refrigeration system is provided inside the model tank frame, and the refrigeration system uses a refrigeration pipe, which is horizontally placed inside the model tank frame, and the refrigeration system is used to refrigerate the soil in the model tank body;

[0015] A transverse measuring tube and a longitudinal measuring tube are respectively arranged inside the model trough frame, and the number of the transverse measuring tubes and the longitudinal measuring tubes are both two. Each transverse measuring tube and the longitudinal measuring tube are symmetrically distributed on the left and right sides of the freezing tube. The transverse measuring tube and the longitudinal measuring tube are both used to assist the temperature detection component in measuring the soil temperature.

[0016] Preferably, there are multiple fin sleeves. When the fin sleeve is in working state, the delivery pipe inputs air into the fin sleeve through the air valve, the fin sleeve is in an expanded state, and the angle between the fin sleeve and the temperature measuring tube is 35°. When the fin sleeve is in an initial state, the fin sleeve is in a flat state, and the fin sleeve is located inside the accommodating groove.

[0017] Preferably, an electric push rod is provided at the bottom of the test plate, a cleaning ring for cleaning the temperature measuring tube is provided at the output end of the electric push rod, an elastic rod is provided at the inner wall of the cleaning ring, a scraper is provided at the first end of the elastic rod away from the cleaning ring, the scraper is made of rubber, and the scraper is used to clean the surface of the fin sleeve, and pressure sensors are provided at the end of the elastic rod and the inside of the fin sleeve;

[0018] The first and second circular rings are respectively disposed on the upper and lower sides of the cleaning ring, and the different surfaces of the first and second circular rings are interconnected with fixing members through electric springs, and each fixing member is disposed on the upper and lower sides of the cleaning ring.

[0019] The present invention also provides an application of a soil layer temperature detection device in a model tank experimental system. A fin sleeve is arranged on the outer side of a temperature measuring tube, and a temperature sensor is installed inside the fin sleeve. In this way, during a frozen soil experiment, the temperature sensor can directly contact the soil through the fin sleeve, thereby reducing the error detected by the temperature sensor and eliminating the step of comparing the temperature data of the temperature measuring tube, thereby achieving convenient, fast and intuitive measurement of the temperature field data of the soil during the freezing process. In addition, a cleaning ring and a scraper are used to remove the soil attached to the outer side of the fin, thereby avoiding a large amount of soil attached to affect the accuracy of the temperature data detected by the temperature sensor.

[0020] Technical effects and advantages of the present invention:

[0021] 1. The present invention arranges the conveying pipe, the conveying channel, the fin sleeve and other components to cooperate with each other, and utilizes the cooperation between the conveying pipe and the conveying channel, so that the fin sleeve is always located in the receiving groove on the temperature measuring tube during the insertion process. In this way, when the temperature measuring tube is inserted into the soil layer, the fin sleeve and the temperature sensor will not frequently collide and rub with the soil, thereby achieving the purpose of protecting the fin sleeve and the temperature sensor, and avoiding the breakage and damage of the fin sleeve and the temperature sensor during the insertion of the temperature measuring tube.

[0022] 2. The present invention sets a cleaning ring, a first circular ring, a second circular ring and other components that cooperate with each other, and uses an electric push rod to control the cleaning ring to move along the outer surface of the temperature measuring tube, so as to achieve the purpose of pulling the soil layer around the temperature measuring tube outward, and avoid the soil layer from exerting an extrusion force on the temperature measuring tube when freezing, causing damage to the temperature measuring tube and the fin sleeve. At the same time, the scraper, the first circular ring and the second circular ring are used to scrape off the soil attached to the outside of the fin sleeve, so as to avoid excessive soil attached to the fin sleeve affecting the data reduced by the laboratory temperature sensor, and further ensure the accuracy of the experimental data detected by the temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the temperature detection component and related structure assembly of the present invention;

[0025] Figure 3 This is a schematic diagram of the temperature measuring tube and related structures of the present invention;

[0026] Figure 4 This is a schematic diagram of the cleaning ring and related structures of the present invention;

[0027] Figure 5 This is a schematic diagram of the initial state of the scraper blade of the present invention;

[0028] Figure 6 It is a schematic diagram of the fin cover and related structures of the present invention;

[0029] Figure 7 This is a schematic diagram of the assembly of the model tank body structure of the present invention;

[0030] Figure 8 It is a schematic diagram of the scraper blade of the present invention under pressure.

[0031] In the figure: 1. temperature detection component; 101. test board; 102. motor; 103. transmission shaft; 104. delivery pipe; 105. temperature measuring tube; 106. fin sleeve; 107. cleaning ring; 108. rubber pad; 109. elastic member; 110. electric push rod; 111. temperature sensor; 112. signal line; 113. air valve; 114. receiving groove; 115. fixing member; 116. first ring; 117. second ring; 118. elastic rod; 119. scraper; 120. rotating plate; 2. model tank body; 201. model tank frame; 202. transverse measuring tube; 203. longitudinal measuring tube; 204. refrigeration system; 205. threaded rod; 206. reinforcement plate; 207. connecting member; 208. transverse reinforcing rib; 209. longitudinal reinforcing rib; 210. adjustment plate. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example 1

[0033] like Figures 1 to 8 As shown, this embodiment discloses a soil layer temperature detection device, including a temperature detection component 1 and a model tank body 2, the temperature detection component 1 is located at the top of the model tank body 2, the temperature detection component 1 is used to cooperate with the model tank body 2 to detect the temperature of the soil, the temperature detection component 1 includes a test plate 101, a drive motor 102 is provided on the top of the test plate 101, the drive motor 102 is fixedly connected to the test plate 101 through a support, the output end of the drive motor 102 is provided with a transmission shaft 103, and the other end of the transmission shaft 103 is provided with a temperature measuring tube 105, a fin sleeve 106 is provided on the outer side of the temperature measuring tube 105, and a temperature sensor 111 for measuring the soil is provided inside the fin sleeve 106. The model tank body 2 includes a model tank frame 201, and the four sides of the model tank frame 201 are provided with corresponding model plates. The four model plates are connected to the model tank frame 201 to form a container for soil experiments. The model tank frame 201 is respectively provided with transverse reinforcing ribs 208 and longitudinal reinforcing ribs 209 through the model plates, and the transverse reinforcing ribs 208 and the longitudinal reinforcing ribs 209 are used to fix the model plates.

[0034] like Figure 2As shown, an air transmission channel is provided inside the temperature measuring tube 105, and the temperature measuring tube 105 is communicated with the fin sleeve 106 through the air transmission channel. A signal line 112 is provided on one side of the temperature sensor 111, and a circuit channel is provided in the middle of the temperature measuring tube 105. The signal line 112 passes through the fin sleeve 106 and is arranged inside the circuit channel. The fin sleeve 106 is communicated with the air transmission channel, and an air valve 113 is provided at the connection between the air transmission channel and the fin sleeve 106. An accommodating groove 114 is provided on the outer surface of the temperature measuring tube 105, and the shape of the accommodating groove 114 is adapted to the fin sleeve 106. An elastic member 109 is provided at the bottom of the temperature measuring tube 105, and a rubber pad 108 is provided at one end of the elastic member 109 away from the temperature measuring tube 105. The shape of the rubber pad 108 is set to be conical, and an accommodating space is provided inside the elastic member 109, and the elastic member 109 is communicated with the transmission channel.

[0035] During use, the gas is transported to the gas transmission channel through the delivery pipe 104, and then the gas is injected into the fin sleeve 106 in conjunction with the air valve 113. The fin sleeve 106 expands, deflects during the expansion of the fin sleeve 106, and separates from the receiving groove 114 on the temperature measuring tube 105. In this way, the temperature sensor 111 is directly in contact with the soil for temperature measurement, which reduces the measured temperature difference and makes the temperature field change of the soil during the freezing process measured by the temperature sensor 111 more accurate. Secondly, when inserting the temperature measuring tube 105 into the soil layer, the elastic member 109 and the rubber pad 108 at the bottom of the temperature measuring tube 105 cooperate with each other, so that the temperature measuring tube 105 will not disturb the soil layer structure during the insertion process, thereby avoiding errors in the measurement of soil temperature.

[0036] like Figure 2 and Figure 4 As shown, a rotating plate 120 is provided on one side of the test plate 101 close to the delivery pipe 104, and the rotating plate 120 is movably connected to the test plate 101. A delivery pipe 104 is provided on the top of the gas delivery channel in the temperature measuring tube 105, and the delivery pipe 104 and the gas delivery channel are communicated with each other. One end of the delivery pipe 104 away from the temperature measuring tube 105 passes through the rotating plate 120, and the inside of the rotating plate 120 is connected to the outer surface of the transmission shaft 103. An electric push rod 110 is provided at the bottom of the test plate 101, and a cleaning ring 107 for cleaning the temperature measuring tube 105 is provided at the output end of the electric push rod 110. The cleaning ring 107 is used to clean the temperature measuring tube 105. An elastic rod 118 is provided on the inner wall, and a scraper 119 is provided on the first end of the elastic rod 118 away from the cleaning ring 107. The material of the scraper 119 is set to rubber material. The scraper 119 is used to clean the surface of the fin sleeve 106. Pressure sensors are provided on the end of the elastic rod 118 and the inside of the fin sleeve 106. The first circular ring 116 and the second circular ring 117 are respectively provided on the upper and lower sides of the cleaning ring 107. The different surfaces of the first circular ring 116 and the second circular ring 117 are interconnected with the fixing member 115 through an electric spring, and each fixing member 115 is arranged on the upper and lower sides of the cleaning ring 107.

[0037] When in use, by fixing the transmission shaft 103 and the conveying pipe 104 on the outer surface of the transmission shaft 103, when the driving motor 102 is turned on, the rotating plate 120 rotates inside the test plate 101, and the temperature measuring tube 105 and the fin sleeve 106 are rotated under the action of the driving motor 102 and the transmission shaft 103, and then the electric push rod 110 is controlled to move the cleaning ring 107 along the outer surface of the temperature measuring tube 105 to the specified position to clean the dirt on the surface of the temperature measuring tube 105 and the fin sleeve 106, so as to avoid the dirt adhering to the surface of the temperature measuring tube 105 and the fin sleeve 106 affecting the measurement result of the temperature sensor 111.

[0038] like Figure 7 As shown, a connecting piece 207 for fixing is arranged on one side of the model slot frame 201, a reinforcing plate 206 is arranged between the two connecting pieces 207 arranged opposite to each other, the reinforcing plate 206 is arranged transversely between the two connecting pieces 207, a threaded rod 205 is arranged on one side of the reinforcing plate 206, the number of the threaded rods 205 is two, each of the threaded rods 205 is symmetrically arranged on one side of the reinforcing plate 206, and the end of each threaded rod 205 away from the reinforcing plate 206 is provided with the same adjusting plate 210, the adjusting plate 210 is movably arranged inside the model slot frame 201, and the inside of the model slot frame 201 A refrigeration system 204 is provided in the body, and the refrigeration system 204 uses a refrigeration pipe, which is horizontally placed inside the model trough frame 201. The refrigeration system 204 is used to refrigerate the soil in the model trough body 2. A transverse measuring tube 202 and a longitudinal measuring tube 203 are respectively provided inside the model trough frame 201. There are two transverse measuring tubes 202 and two longitudinal measuring tubes 203. Each transverse measuring tube 202 and longitudinal measuring tube 203 is symmetrically distributed on the left and right sides of the refrigeration tube. The transverse measuring tube 202 and the longitudinal measuring tube 203 are both used to assist the temperature detection component 1 in measuring the soil temperature.

[0039] When in use, by setting a transverse measuring tube 202, a longitudinal measuring tube 203 and a freezing system 204, the soil layer in the model trough body 2 is refrigerated by the freezing tube in the freezing system 204, that is, the freezing test of the soil layer is started, and the two transverse measuring tubes 202 and the two longitudinal measuring tubes 203 in the model trough body 2 are used to assist the temperature detection component 1 to measure the temperature of the soil layer in the model trough body 2. In addition, according to the actual experimental specifications, the threaded rod 205 is manually rotated, and the adjustment plate 210 is controlled to move inside the model trough body 2 as the threaded rod 205 rotates, thereby achieving the effect of adjusting the experimental space inside the model trough body 2, and the reinforcement plate 206 is fixed by the symmetrically arranged fixing parts 115, and the reinforcement plate 206 is used to achieve the effect of limiting the adjustment plate 210.

[0040] like Figure 2As shown, there are multiple fin sleeves 106. When the fin sleeve 106 is in working state, the delivery pipe 104 inputs air into the fin sleeve 106 through the air valve 113, the fin sleeve 106 is in an expanded state, and the angle between the fin sleeve 106 and the temperature measuring tube 105 is 35°. When the fin sleeve 106 is in the initial state, the fin sleeve 106 is in a flat state, and the fin sleeve 106 is located inside the accommodating groove 114.

[0041] When in use, firstly place the soil for the experiment inside the model tank body 2, then rotate the threaded rod 205 symmetrically arranged by manual rotation to move the adjustment plate 210 along the inside of the model tank body 2, and adjust the accommodation space inside the model tank body 2 according to the actual experimental scale through the movement of the adjustment plate 210, and then use the movement of the adjustment plate 210 to compact the soil layer inside the model tank, and then set a pre-drilled hole on the surface of the compacted soil, and then insert the test plate 101 and the temperature measuring tube 105 into the pre-drilled hole perpendicular to the model tank body 2 according to the pre-drilled hole, and during the insertion process, the bottom conical rubber pad 108 and the elastic member 109 cooperate with each other, so that the temperature measuring tube 105 will not disturb the soil layer structure, so as to avoid causing a large error in the temperature data detected by the temperature sensor 111;

[0042] When inserted into the designated position, the rubber pad 108 at the bottom of the temperature measuring tube 105 will be squeezed by the soil pressure on the elastic member 109, and the gas in the elastic member 109 will be quickly filled into the interior of the temperature measuring tube 105, and in this process, a buffering effect will be achieved on the movement of the temperature measuring tube 105 during the insertion process. Subsequently, the gas is transported to the inside of the gas transmission channel through the delivery pipe 104, and the gas is filled into the inside of the fin sleeve 106 in conjunction with the air valve 113, so that the fin sleeve 106 is in an expanded state, and the fin sleeve 106 in the expanded state will be separated from the receiving groove 114 on the temperature measuring tube 105, and at the same time, an angle of 35° will be generated between the fin sleeve 106 and the temperature measuring tube 105. In this way, the fin sleeve 106 and the temperature sensor 111 are used to directly contact the soil and measure the temperature of the soil in real time, and the temperature field change of the soil during the freezing experiment is observed to obtain accurate temperature change data;

[0043] During the insertion of the temperature measuring tube 105, a cleaning tube is used to guide the temperature measuring tube 105 to prevent the temperature measuring tube 105 from tilting during the insertion process. The circuit channel opened in the middle of the axis of the temperature measuring tube 105 is used to protect the signal line 112 on the temperature sensor 111 to prevent damage during drilling into the soil, which causes the data detected by the temperature sensor 111 to be unable to be transmitted to the experimental system. During the measurement of the soil temperature, the freezing tube in the freezing system 204 is used to cool the soil layer in the model tank body 2. At the same time, the horizontal measuring tube 202 and the longitudinal measuring tube 203 arranged around the freezing tube are used to measure the temperature of the bottom of the soil layer, and the measured temperature data is recorded. Subsequently, the temperatures measured by the temperature measuring tube 105 and the temperature sensor 111 are compared to obtain accurate temperature data of the change in the temperature field of the soil layer during the freezing process, thereby completing the recording of the temperature data of the soil during the freezing experiment.

[0044] It should be noted that: after completing the measurement of the soil layer temperature, the delivery pipe 104 and the delivery channel are controlled to extract the gas in the fin sleeve 106 to the outside, so that the fin sleeve 106 is gradually retracted into the receiving groove 114 on the temperature measuring tube 105. In this way, in the process of removing the temperature measuring tube 105, the fin sleeve 106 will not frequently come into contact with the surrounding soil, thereby avoiding the fin sleeve 106 from being damaged during the removal process, which in turn causes damage to the temperature sensor 111. Example 2

[0045] The present embodiment discloses an application of a soil layer temperature detection device in a model tank experimental system, wherein a fin sleeve 106 is arranged on the outer side of a temperature measuring tube 105, and a temperature sensor 111 is installed inside the fin sleeve 106. Thus, during a frozen soil experiment, the temperature sensor 111 can directly contact the soil through the fin sleeve 106, thereby reducing the error detected by the temperature sensor 111 and eliminating the step of comparing the temperature data of the temperature measuring tube 105, thereby realizing convenient, fast and intuitive measurement of the temperature field data of the soil during the freezing process. In addition, the cleaning ring 107 and the scraper 119 are used to remove the soil attached to the outer side of the fin, thereby preventing a large amount of soil from attaching and affecting the accuracy of the temperature data detected by the temperature sensor 111. Example 3

[0046] Although the temperature sensor 111 in the fin sleeve 106 is directly in contact with the soil layer through the cooperation between the temperature measuring tube 105 and the fin sleeve 106 on the surface of the temperature measuring tube 105, and the temperature data measured is more accurate than the temperature data measured by the temperature sensor 111 built in the temperature measuring tube 105, the exposed fin sleeve 106 will be in direct contact with the soil during the insertion of the temperature measuring tube 105, which will cause the fin sleeve 106 and the temperature sensor 111 inside to be subjected to strong impact or the fin sleeve 106 will always produce friction with the soil during long-term use, causing the fin sleeve 106 to be damaged and the temperature sensor 111 to be damaged. In addition, during the soil freezing experiment, the water inside the soil will slowly freeze when the soil is at 0°, thereby causing the soil to frost heave and squeeze the temperature measuring tube 105 in the model tank body 2, causing the temperature sensor 111 to be damaged due to squeezing. Based on this, Example 3 is proposed:

[0047] By installing a pressure sensor in the fin sleeve 106 and judging the squeezing force between the soil and the temperature measuring tube 105 through the gas pressure in the fin sleeve 106, in the initial state (before or just after the soil freezing experiment), the preset value of the pressure sensor is set to the pressure data of the temperature measuring tube 105 just inserted into the soil, that is, the pressure value in the initial state is recorded as T.

[0048] At the same time, when the temperature measuring tube 105 is inserted, the delivery tube 104 cooperates with the delivery channel to draw the gas in the fin sleeve 106 outward, so that the fin sleeve 106 will be located in the receiving groove 114 on the temperature measuring tube 105. In this state, the fin sleeve 106 will not collide or rub with the soil during the insertion of the temperature measuring tube 105 into the soil layer, thereby achieving the protection effect of the fin sleeve 106 and the temperature sensor 111.

[0049] When the pressure sensor detects that the pressure value in the fin sleeve 106 is equal to T, it means that the frost heave force of the soil is within the normal range. No adjustment is required, and the temperature of the soil can be continuously detected through the temperature sensor 111 in the fin sleeve 106.

[0050] When the pressure sensor detects that the pressure value in the fin sleeve 106 is greater than T, it means that the soil has undergone frost heave during the freezing experiment. Due to the expansion of the soil, a high squeezing pressure is generated on the outer surface of the temperature measuring tube 105 and the fin sleeve 106. First, the driving motor is controlled to rotate the temperature measuring tube slowly, and then the gas is gradually input into the fin sleeve through the delivery pipe and the delivery pipeline, so that the air pressure inside the fin sleeve gradually increases, so that the angle between the fin sleeve and the temperature measuring tube will gradually increase, and the rotation of the temperature measuring tube at this time and the state of the fin sleeve at this time will stir the soil around the temperature measuring tube, so that the soil around the temperature measuring tube will become loose, and then the gas in the fin sleeve 106 will be extracted again through the delivery pipe 104 and the delivery channel to restore the fin sleeve 106 to its initial state. The angle between the sleeve 106 and the temperature measuring tube 105 will gradually decrease, and the fin sleeve 106 will contact the receiving groove 114 on the outer surface of the temperature measuring tube 105, and then the electric push rod 110 will be controlled to control the cleaning ring 107 to move on the outer surface of the temperature measuring tube 105 toward the rubber pad 108. In this process, the cleaning ring 107 is used to pry the soil around the temperature measuring tube 105 away from the temperature measuring tube 105, thereby reducing the squeezing force of the soil on the temperature measuring tube 105 during the frost heave process, avoiding the fin sleeve 106 from being damaged by a high squeezing force, causing damage to the temperature sensor 111 in the fin sleeve 106, and in addition, this also avoids the temperature measuring tube 105 from being deformed or cracked after being subjected to a high squeezing force, causing damage to the signal line 112 inside the temperature measuring tube 105.

[0051] Since the fin cover 106 is extended outward, the temperature sensor 111 inside the fin cover 106 is in direct contact with the surface of the soil, thereby improving the accuracy of the temperature data detected by the temperature sensor 111. However, since the outer surface of the fin cover 106 is in contact with the soil for a long time, a large amount of soil will be adsorbed on the outer surface of the fin cover 106, causing a delay in temperature detection. At the same time, since the outer surface of the fin cover 106 is attached to the soil for a long time, errors in the measured temperature data will occur.

[0052] Therefore, when the cleaning ring 107 moves along the outer surface of the temperature measuring tube 105, since the scraper 119 on the cleaning ring 107 is always in contact with the outer surface of the temperature measuring tube 105, when mud adheres to the surface of the fin sleeve 106, the scraper 119 will be subjected to an extrusion force, which will cause the elastic rod 118 to expand and contract. At this time, the pressure value of the elastic rod 118 is detected by the pressure sensor on the inner side of the cleaning ring 107 to determine whether mud is adhered to the surface of the fin sleeve 106.

[0053] When the pressure sensor detects that the pressure on the elastic rod 118 is always at the preset value, it means that there is no soil or a small amount of soil attached to the outer surface of the fin sleeve 106, and it will not cause errors in the detection data of the temperature sensor 111. Then, the electric push rod 110 continues to be controlled to move downward without any processing, and the soil continues to be pulled away from the temperature measuring tube 105.

[0054] When the pressure sensor detects that the pressure on the elastic rod 118 is slightly higher than the preset value, it means that the thickness of the soil attached to the surface of the fin sleeve 106 is slightly high, which will affect the temperature data detected by the temperature sensor 111. At this time, the electric push rod 110 is turned off to make the cleaning rod always located at the soil on the surface of the fin sleeve 106. Then the drive motor 102 is controlled to make the temperature measuring tube 105 rotate slowly. Since the cleaning ring 107 is always on the surface of the fin sleeve 106, the scraper 119 is also always located at the soil on the surface of the fin sleeve 106. In conjunction with the rotation of the temperature measuring tube 105, the surface of the fin sleeve 106 frequently rubs against one side of the scraper 119, and the scraper 119 is used to scrape off the soil on the outside of the fin sleeve 106 (please refer to the detailed description for details). Figure 5 ), thereby achieving the effect of cleaning the surface of the fin cover 106.

[0055] When the pressure sensor detects that the pressure on the elastic rod 118 is much higher than the preset value, it means that the thickness of the mud attached to the surface of the fin sleeve 106 is too high, which has seriously affected the temperature data detected by the temperature sensor 111. At this time, the electric spring on the first ring 116 is controlled to generate a squeezing force on the first ring 116, so that the second ring 117 moves toward the first ring 116. When the distance between the first ring 116 and the second ring 117 is reduced, the scraper 119 located between the first ring 116 and the second ring 117 will be squeezed by the squeezing force generated by the first ring 116 and the second ring 117, thereby generating deformation (please refer to the specific Figure 8 ), and cooperate with the elastic rod 118 to bend toward the surface of the fin sleeve 106, so that the friction between the scraper and the surface of the fin sleeve 106 will gradually increase, and then continue to cooperate with the drive motor 102 to control the temperature measuring tube 105 to rotate, so that the surface of the fin sleeve 106 frequently rubs against one side of the scraper 119, and then control the electric push rod 110 to make the cleaning ring 107 move up and down slightly on the outer surface of the fin sleeve 106, so as to achieve the segmentation and scraping of the soil attached to the outer side of the fin sleeve 106, thereby achieving the effect of removing the thicker soil attached to the outer side of the fin sleeve 106.

[0056] It is worth noting that: since the scraper 119 is set to be made of rubber material, when the first ring 116 and the second ring 117 are close to each other, the scraper 119 will be deformed due to the extrusion force generated by the first ring 116 and the second ring 117, and under the limiting effect of the elastic rod 118, since the edge of the scraper 119 on one side close to the elastic rod 118 is set to an arc shape, when the extrusion force of the first ring 116 and the second ring 117 is matched, the scraper 119 will bend in the direction close to the fin sleeve 106. In addition, when the temperature measuring tube 105 rotates, even if the surface of the fin sleeve 106 is in contact with the scraper 119 for a long time, the scraper 119 will not damage the outer surface of the fin sleeve 106.

[0057] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 soil layer temperature detection device, comprising a temperature detection component (1) and a model trough body (2), wherein the temperature detection component (1) is located at the top of the model trough body (2), and the temperature detection component (1) is used to cooperate with the model trough body (2) to detect the temperature of the soil, characterized in that: The temperature detection component (1) comprises a test plate (101), a drive motor (102) is provided on the top of the test plate (101), the drive motor (102) is fixedly connected to the test plate (101) via a support, a transmission shaft (103) is provided at the output end of the drive motor (102), a temperature measuring tube (105) is provided at the other end of the transmission shaft (103), a fin sleeve (106) is provided on the outside of the temperature measuring tube (105), and a temperature sensor (111) for measuring soil is provided inside the fin sleeve (106); The model trough body (2) comprises a model trough frame (201), the four sides of the model trough frame (201) are provided with model plates corresponding to each other, and the four model plates are connected to the model trough frame (201) to form a container for soil body experiments, and the model trough frame (201) is respectively provided with transverse reinforcing ribs (208) and longitudinal reinforcing ribs (209) through the model plates, and the transverse reinforcing ribs (208) and longitudinal reinforcing ribs (209) are used to fix the model plates; An air delivery channel is provided inside the temperature measuring tube (105), and the temperature measuring tube (105) is communicated with the fin sleeve (106) through the air delivery channel, the fin sleeve (106) and the air delivery channel are communicated with each other, an air valve (113) is provided at the connection between the air delivery channel and the fin sleeve (106), a delivery pipe (104) is provided at the top of the air delivery channel in the temperature measuring tube (105), and the delivery pipe (104) and the air delivery channel are communicated with each other; The number of the fin sleeves (106) is plural, and when the fin sleeves (106) are in a working state, the delivery pipe (104) inputs air into the fin sleeves (106) through the air valve (113), the fin sleeves (106) are in an expanded state, the angle between the fin sleeves (106) and the temperature measuring tube (105) is 35 degrees, and when the fin sleeves (106) are in an initial state, the fin sleeves (106) are in a flat state, and the fin sleeves (106) are located inside the accommodating groove (114).

2. A soil layer temperature detection device according to claim 1, characterized in that: A signal line (112) is provided on one side of the temperature sensor (111), a circuit channel is provided in the middle of the temperature measuring tube (105), and the signal line (112) passes through the fin sleeve (106) and is arranged inside the circuit channel.

3. A soil layer temperature detection device according to claim 2, characterized in that: The outer surface of the temperature measuring tube (105) is provided with a receiving groove (114), and the shape of the receiving groove (114) is mutually compatible with the fin sleeve (106). An elastic member (109) is provided at the bottom of the temperature measuring tube (105), and a rubber pad (108) is provided at one end of the elastic member (109) away from the temperature measuring tube (105), and the shape of the rubber pad (108) is set to be conical. An accommodating space is provided inside the elastic member (109), and the elastic member (109) is communicated with the conveying channel.

4. A soil layer temperature detection device according to claim 1, characterized in that: A rotating plate is provided on one side of the test plate (101) close to the delivery tube (104), and the rotating plate is movably connected to the test plate (101); an end of the delivery tube (104) away from the temperature measuring tube (105) passes through the rotating plate; and the interior of the rotating plate is connected to the outer surface of the transmission shaft (103).

5. A soil layer temperature detection device according to claim 1, characterized in that: A connecting piece (207) for fixing is disposed oppositely on one side of the model slot frame (201), and a reinforcing plate (206) is disposed between two oppositely disposed connecting pieces (207), and the reinforcing plate (206) is transversely disposed between the two connecting pieces (207); A threaded rod (205) is provided on one side of the reinforcing plate (206), and the number of the threaded rods (205) is two, each of the threaded rods (205) is symmetrically arranged on one side of the reinforcing plate (206), and the end of each of the threaded rods (205) away from the reinforcing plate (206) is provided with the same adjustment plate (210), and the adjustment plate (210) is movably arranged inside the model slot frame (201).

6. A soil layer temperature detection device according to claim 5, characterized in that: A refrigeration system (204) is provided inside the model tank frame (201), and the refrigeration system (204) uses a refrigeration pipe, which is horizontally placed inside the model tank frame (201), and the refrigeration system (204) is used to cool the soil inside the model tank body (2); A transverse measuring tube (202) and a longitudinal measuring tube (203) are respectively arranged inside the model trough frame (201), and the number of the transverse measuring tube (202) and the longitudinal measuring tube (203) is two, and each transverse measuring tube (202) and longitudinal measuring tube (203) is symmetrically distributed on the left and right sides of the freezing tube, and the transverse measuring tube (202) and the longitudinal measuring tube (203) are used to assist the temperature detection component (1) in measuring the soil temperature.

7. A soil layer temperature detection device according to claim 4, characterized in that: An electric push rod (110) is provided at the bottom of the test plate (101), and a cleaning ring (107) for cleaning the temperature measuring tube (105) is provided at the output end of the electric push rod (110), and an elastic rod (118) is provided on the inner wall of the cleaning ring (107), and a scraper (119) is provided at the first end of the elastic rod (118) away from the cleaning ring (107), and the material of the scraper (119) is set to be a rubber material, and the scraper (119) is used to clean the surface of the fin sleeve (106); A first circular ring (116) and a second circular ring (117) are respectively provided on the upper and lower sides of the cleaning ring (107), and an electromagnet and a magnetic block are respectively provided on the opposite surfaces of the first circular ring (116) and the second circular ring (117), the electromagnet being used to control the second circular ring (117) to move in the direction of the first circular ring (116), and the different surfaces of the first circular ring (116) and the second circular ring (117) are connected to each other through compression springs and fixing members (115), and each fixing member (115) is arranged on the upper and lower sides of the cleaning ring (107).

8. Application of a soil layer temperature detection device as claimed in claim 7 in a model tank experimental system.

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