Shield cutter head temperature monitoring system

Abstract

The utility model discloses a shield cutter head temperature monitoring system, and relates to the technical field of shield tunnel construction. Comprising a plurality of temperature monitoring sensors which are installed in a cutter box in a shield cutter head, and each temperature monitoring sensor is installed in a mode of being tightly attached to a hob and collects real-time temperature data of different parts of the cutter head at the same time; the central end is mounted on the inner wall of a cutter head cavity of the shield, is in communication connection with the temperature monitoring sensor and is used for receiving and transmitting the acquired temperature data; and the upper computer is arranged in a central control room of the shield, is in communication connection with the industrial personal computer and the central end, receives the data which is forwarded by the central end and is acquired by the temperature monitoring sensor, and displays the temperature data of different parts of the shield cutter head. The temperature of the cutterhead can be monitored in real time, the change range of the temperature of the cutterhead when the shield excavates in different stratums and the temperature fluctuation condition of the cutterhead under the abnormal working conditions such as abnormal hob abrasion and mud cake formation are determined, the service life of the cutterhead is prolonged, and the safety and efficiency of shield construction are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield tunnel construction, and more specifically relates to a shield cutter head temperature monitoring system. Background Art

[0002] As a large-scale tunneling equipment currently used in subway tunnel construction, the shield machine has an earth pressure balance chamber or slurry balance chamber behind the cutter head. In order to improve the construction efficiency of the machine, it is often opened for inspection after a long period of time during operation. At this time, the cutter head is in a black box state, resulting in the inability to obtain the abnormal state of the machine operation in time, and there is also a certain lag in the perception of the stratum conditions in the front face. Accurately understanding the conditions of the stratum in front will help make reasonable construction decisions, avoid geological disasters and equipment failures, and ensure the safety and efficiency of construction.

[0003] During the shield tunneling process, the cutter crushes the rock and soil, and the friction between the cutterhead and the slag will generate heat. The thermal conductivity of different strata is different, so the change in the cutterhead temperature also reflects the change in the stratum in front of the shield to a certain extent. In particular, when the roller cutter is abnormally worn or the cutterhead is "mud caked", the temperature of the entire or local area of ​​the cutterhead will rise significantly, affecting the service life of the cutterhead and reducing the tunneling efficiency of the shield. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a shield cutter head temperature monitoring system, which can monitor the cutter head temperature, determine the range of cutter head temperature variation when the shield is excavating in different strata, and the temperature fluctuation under abnormal working conditions such as abnormal wear of the cutter disc and mud cake formation on the cutter head, and realize the identification of the rock mass excavated by the shield based on the monitored temperature value, which helps to improve the safety and efficiency of shield construction.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A shield cutterhead temperature monitoring system, comprising:

[0007] Several temperature monitoring sensors are installed in the cutter box of the shield cutter head. Each temperature monitoring sensor is installed close to the cutter head and collects real-time temperature data of different parts of the cutter head at the same time.

[0008] The center end is installed on the inner wall of the cutterhead cavity of the shield machine, and is connected to the temperature monitoring sensor to receive and transmit the collected temperature data;

[0009] The host computer is installed in the central control room of the shield machine, and is connected to the industrial computer and the central end. It receives the data collected by the temperature monitoring sensor and forwarded by the central end, and displays the temperature data of different parts of the shield cutter head.

[0010] Preferably, the central end is connected to the temperature monitoring sensor in a wireless manner.

[0011] Preferably, the host computer is connected to the central end in a wired manner.

[0012] Preferably, the temperature monitoring sensor includes a sensing contact, a sensor box, a wire guard plate, and a battery compartment box. The sensing contact is arranged close to the blade of the hob, and the sensing contact is connected to the sensor box. The sensor box is installed on the first sensor mounting base plate and the second sensor base plate. An antenna and a signal line are provided in the sensor box. The wire guard plate is installed on the welding base plate of the wire guard plate, and the line passes through the wire guard groove of the wire guard plate. The battery compartment box is installed on the base plate of the battery compartment box. A battery is provided in the battery compartment box, and the battery is electrically connected to the sensing contact.

[0013] The beneficial effect of adopting the above technical scheme is that the utility model collects the temperature data of various parts of the cutter disc in real time through the temperature monitoring sensor and displays it through the host computer. It can observe and monitor the temperature of the cutter disc at any time, understand the temperature fluctuation of the cutter disc and the temperature change range of the cutter disc, increase the service life of the cutter disc, and help improve the safety and efficiency of shield construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 Schematic diagram of the structure and installation of the temperature monitoring sensor;

[0016] Figure 3 It is a schematic diagram of the position relationship between the temperature monitoring sensor and the cutter disc;

[0017] Figure 4 It is a schematic diagram of the shield excavation stratum prediction process;

[0018] In the figure: 1. Temperature monitoring sensor; 2. Center end; 3. Host computer; 4. Cutter box; 5. Cutter head cavity; 6. Central control room; 7. Sensor box; 8. Wire guard plate; 9. Battery compartment box; 10. First sensor mounting base plate; 11. Second sensor mounting base plate; 12. Wire guard plate welding base plate; 13. Battery compartment box base plate; 14. Battery; 15. Battery compartment cover; 16. Industrial computer; 17. Hob; 18. Shield. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] like Figure 1 As shown, the shield cutter head temperature monitoring system includes several temperature monitoring sensors 1, a center end 2, and a host computer 3.

[0021] The temperature monitoring sensor 1 is installed in the cutter box 4 in the shield cutter head, and each temperature monitoring sensor 1 is installed close to the roller cutter 17. Specifically, Figure 2 As shown, the temperature monitoring sensor 1 includes a sensing contact, a sensor box 7, a wire guard plate 8, and a battery compartment box 9. The sensing contact is set close to the blade of the hob 17, and the sensing contact is connected to the sensor box 7. The sensor box 7 is installed on the first sensor installation base plate 10 and the second sensor base plate 11. The sensor box 7 is provided with an antenna and a signal line. The wire guard plate 8 is installed on the wire guard plate welding base plate 12. The line passes through the wire guard groove of the wire guard plate 8. The battery compartment box 9 is installed on the battery compartment box base plate. The battery compartment box 9 is provided with a battery 14, and the battery 14 is electrically connected to the sensing contact. The temperature monitoring sensor 1 is used to collect the temperature information of the shield machine cutter head. When the external temperature changes, the voltage applied to the two ends of the sensor chip will change. When the temperature rises, the voltage at the two ends of the sensor will drop. The voltage value is converted by the analog-to-digital converter. The converted signal is processed by the single-chip microcomputer, and then the temperature at the current cutter head position can be known through the proportional relationship between temperature and voltage.

[0022] The specific installation process of the temperature monitoring sensor 1 is as follows: first, place the surface of the induction contact close to the blade of the hob 17, spot weld the first sensor mounting base plate 10 and the second sensor mounting base plate 11, remove the hob 17, and remove the sensor; then, fully weld the first sensor mounting base plate 10 and the second sensor mounting base plate 11, and weld the wire guard welding base plate 12 and the battery compartment box base plate 13; finally, use bolts coated with thread fasteners to fix the sensor box 7 on the first sensor mounting base plate 10 and the second sensor mounting base plate 11. The sensor box 7 contains an antenna and a signal line. In order to prevent water from entering the sensor, the line is passed through the wire groove of the wire guard 8 and connected to the battery compartment box 9, and the line joint is sealed with liquid raw tape, and then the wire groove is filled with foam glue, and finally all the bolts of the wire guard 8 and the battery compartment box 9 are coated with thread fasteners to complete the installation of the temperature monitoring sensor 1.

[0023] The battery compartment box 9 is equipped with a battery 14, and the battery 14 is a rechargeable battery. The battery 14 can power the temperature sensor. At least one spare rechargeable power supply of the same model is required to be used for replacement when the battery 14 is exhausted. The battery replacement process is as follows: After the shield stops excavating, first remove the battery compartment cover 15 of the battery compartment box 9, then unplug the power cord, and take out the battery 14, then plug the power cord into the spare rechargeable power supply, and fix the spare rechargeable power supply in the battery compartment box 9, finally install the battery compartment cover 15, tighten the fixing bolts, and the replacement is completed. After the replacement is completed, take the battery 14 out of the cutter head for charging, and replace it when the spare rechargeable power supply is exhausted.

[0024] The detection range of the temperature monitoring sensor is -40℃~85℃, and the resolution is 1℃. The frequency of obtaining the temperature of the cutter head is once a minute.

[0025] The central terminal 2 is installed on the inner wall of the cutterhead cavity 5 of the shield 18, and can transmit the control instructions of the host computer 3 to the industrial computer 16. In addition, the central terminal 2 also receives the cutterhead temperature information sent by the temperature monitoring sensor 1 and transmits it to the host computer 3. Since the environment in front of the cutterhead is relatively complex and the communication line cannot be set up, wireless communication between the central terminal 2 and the sensor 1 is set up, and the conditions for setting up a communication line between the central terminal 2 and the host computer 3 are met. Considering the issues of signal strength and transmission rate, wired communication between the central terminal 2 and the host computer 3 is set up.

[0026] The host computer 3 is used to receive the cutterhead temperature monitoring information transmitted from the central end 2, and comprehensively analyzes the temperature change state of the shield machine cutterhead in combination with the preset geological information, excavation parameter information and shield opening and cutter inspection data, and identifies and warns of abnormal cutterhead status. Due to the small space inside the cutterhead and the poor working environment, it is inconvenient for operators to enter the cutterhead to control the cutterhead temperature collection. The host computer 3 is installed in the central control room 6 of the shield 18. The host computer 3 is connected to the industrial computer 16 for communication. Therefore, the control switch of the host computer 3 can control the operation of the industrial computer 16 through telecommunications, and then the industrial computer 16 controls the collection work of the temperature monitoring sensor 1. After the data collection is completed, the industrial computer 16 uploads the cutterhead temperature information to the host computer 3. In this way, the cutterhead temperature collection work can be realized in the central control room 6 of the shield 18, and finally the temperature information at different positions of the entire cutterhead is displayed on the display. Figure 3 As shown, according to the arrangement of the hobs 17 of the cutter disc, considering the spacing of the hobs 17, reasonable positions are selected to arrange multiple temperature monitoring sensors 1 on the cutter disc, so that the temperature of different parts of the cutter disc can be monitored, so that the overall state of the cutter disc can be grasped more accurately.

[0027] The cutterhead temperature information obtained by the above device can, on the one hand, timely warn of abnormal working conditions such as cutter mud cake and abnormal cutter wear, and on the other hand, it can also help identify the excavation strata along the shield line, such as Figure 4 As shown, the specific steps are as follows:

[0028] Step 1: Obtain the temperature information of different positions of the cutter disc according to the cutter disc temperature monitoring device, and determine whether the hob is in an abnormal state by combining the opening and checking cutter data of the on-site workers;

[0029] Step 2: If the cutterhead is in an abnormal state, match the temperature value monitored at the corresponding position according to the type of the abnormal state, and obtain the temperature limit values ​​under different abnormal states; then delete the temperature value at the abnormal state, and select the average of the temperature monitoring values ​​at the remaining positions as the basis for identifying the excavation stratum;

[0030] Step 3: If there is no abnormal state of the cutter head, directly take the average of the temperature monitoring values ​​at multiple positions as the basis for identifying the excavation stratum;

[0031] Step 4: Combine the geological survey report, slag information and shield excavation parameters to obtain the accurate situation of the excavated strata, divide the strata, calculate the threshold values ​​of different stratum temperatures, achieve accurate matching of stratum and cutterhead temperatures, and determine the cutterhead temperature confidence intervals corresponding to different strata.

[0032] Step 5: Keep the division results in the host computer 3, continue excavation through the shield, identify the strata according to the change of temperature values, and then compare the predicted results with the actual results to verify the feasibility of the method, and continuously improve the cutterhead temperature confidence interval corresponding to different strata to improve the accuracy and reliability of stratum identification.

[0033] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A shield cutterhead temperature monitoring system, characterized in that: include: A plurality of temperature monitoring sensors (1) are installed in a cutter box (4) in a shield cutter head, and each temperature monitoring sensor (1) is installed close to the roller cutter (17); The central end (2) is mounted on the inner wall of the cutterhead cavity (5) of the shield machine and is in communication connection with the temperature monitoring sensor (1); The upper computer (3) is installed in the central control room (6) of the shield machine and is communicatively connected with the industrial computer (16) and the central end (2).

2. A shield cutterhead temperature monitoring system according to claim 1, characterized in that: The central end (2) is connected to the temperature monitoring sensor (1) in a wireless manner.

3. A shield cutterhead temperature monitoring system according to claim 1, characterized in that: The host computer (3) is connected to the central end (2) in a wired manner.

4. A shield cutterhead temperature monitoring system according to claim 1, characterized in that: The temperature monitoring sensor (1) comprises a sensing contact, a sensor box (7), a wire guard plate (8), and a battery compartment box (9). The sensing contact is arranged close to the blade of the hob (17), the sensing contact is connected to the sensor box (7), the sensor box (7) is mounted on a first sensor mounting base plate (10) and a second sensor base plate (11), an antenna and a signal line are arranged in the sensor box (7), the wire guard plate (8) is mounted on a wire guard plate welding base plate (12), the line passes through a wire guard groove of the wire guard plate (8), the battery compartment box (9) is mounted on the battery compartment box base plate, a battery (14) is arranged in the battery compartment box (9), and the battery (14) is electrically connected to the sensing contact.

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