An integrated automatic measuring device and method for sea mud thickness in a nuclear power plant pump room

Abstract

The present invention relates to an integrated automatic measuring device and method for the thickness of sea mud in a nuclear power plant pump room. The measuring device includes a mobile control stand, a control system, and a display system, and its internal components include an electrical control system, a lifting transmission system, a position adjustment mechanism, an underwater sealing functional component, and a measuring component. Aiming at the problems of accuracy, randomness, and convenient operation in the traditional measurement method of the thickness of sludge in the seawater pump room of a nuclear power plant, the present invention designs an integrated automatic measuring device for the thickness of sea mud. The device integrates electric drive, acoustic wave measurement, pressure measurement, and visual control, and realizes one-button measurement of the thickness of sea mud in the pump room. It is specially designed for the uncertain factors of the underwater measurement environment. While ensuring the continuous measurement of underwater sludge by the system, it effectively avoids the difficulties of the oscillation of the measuring probe underwater and the adjustment of the measuring point, thereby improving the accuracy, continuity, and reliability of the measurement of the device.

Description

Technical Field

[0001] The invention relates to the technical field of cold source water intake systems for nuclear power plants, and in particular to an integrated automatic measuring device and method for the thickness of sea mud in a pump room of a nuclear power plant. Background Art

[0002] At present, with the deterioration of the marine environment, the eutrophication trend of coastal waters is serious, resulting in frequent blockages caused by various foreign objects. In severe cases, it leads to power reduction, load shedding and even emergency shutdown of the unit. The important plant water system (SEC system, an open circulation system with seawater as the flowing medium) is the final heat sink of the nuclear island and one of the important links of the cold source system. It is responsible for exporting the heat transmitted by the equipment cooling water system and finally transferring the heat back to the seawater to ensure the safety of cooling water intake of the important plant water system of the nuclear power plant, that is, to ensure the safety of the final heat sink of the nuclear power plant, which is of vital importance to the nuclear safety of the nuclear power plant. Therefore, in order to avoid the accumulation of a large amount of sediment in the SEC system culvert to block the water intake of the water pump, it is necessary to regularly measure the sludge thickness of the nuclear power plant water intake pump room to avoid the risk of blockage. The sludge measurement method of the nuclear power plant water intake pump room is mainly to use a plumb bob or a ruler to extend into the measuring port for repeated measurements, which requires a lot of manpower and is inefficient. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of low efficiency, discontinuous measurement data, and great influence of underwater undercurrent turbulence in traditional sea mud measurement methods, and to provide an integrated automatic measurement device and method for the thickness of silt in a nuclear power plant pump room. The inventor of the present application has solved the problem of undercurrent turbulence when the existing measurement method is applied underwater, and proposed a device and method that can perform stable sea mud depth measurement.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a mobile nuclear power pump room sea mud thickness automatic measuring device, characterized in that it includes a mobile control platform, a control system, a display system, a lifting transmission system, a position adjustment mechanism and an underwater sealing functional part. The mobile control platform is used to install the control system, the display system, the lifting transmission system, the position adjustment mechanism and the underwater sealing functional part; the control system is used to control the lifting transmission system and the position adjustment mechanism, thereby controlling the position movement of the lifting movement of the underwater sealing functional part. The lifting transmission system includes a cable pulley, a cable winch assembly, and an electric drum reel. The cable wound on the cable winch assembly is connected to the underwater sealing functional part through the cable pulley and the electric drum reel. The underwater sealing functional part is connected to the measuring probe through a load-bearing cable. The position adjustment mechanism includes a probe left and right adjustment wheel, a probe front and rear adjustment wheel and a pulley frame. The cable pulley is installed on the pulley frame and can move with the adjustment of the probe left and right adjustment wheel and the probe front and rear adjustment wheel. The cable is connected to the underwater sealing functional part through the cable pulley.

[0005] Furthermore, the mobile control console frame includes front fixed wheels, rear universal wheels and an electric control cabinet, and the front fixed wheels and the rear universal wheels are automatically and accurately positioned above the measuring port through limiting guide rails installed on site.

[0006] Furthermore, it also includes a speed regulator, which is installed on the front panel of the mobile control console frame and is used to control the change of the driving hoisting speed of the cable hoisting assembly of the lifting transmission system in the same gear position.

[0007] Furthermore, it also includes a coulomb meter and a battery. The coulomb meter is installed on the front panel of the mobile control console frame to measure the battery power and realize real-time monitoring of the battery power.

[0008] Furthermore, it also includes an operating handle, which is installed on the front panel of the mobile control console frame and is used to control the rise and fall of the cable winch assembly. The operating handle is set to three gears to control the low-speed, medium-speed and high-speed rise or fall of the cable winch assembly.

[0009] Furthermore, the cable winding assembly controls the automatic retraction and extension of the cable through a combination of a cable pulley and a probe position adjustment mechanism.

[0010] Furthermore, the probe position adjustment mechanism drives the cable pulley to move forward, backward, left and right through manual control of the probe left and right adjustment wheel and the probe front and back adjustment wheel, and further drives the probe to move forward, backward, left and right, ultimately achieving movement and adjustment of the measuring probe to any point on the measuring port plane.

[0011] Furthermore, the measuring probe is connected to the load-bearing cable through the underwater sealing functional part, and the measuring probe includes an acoustic wave sensor and a pressure sensor, the acoustic wave sensor is used to measure the distance from the probe to the silt, and the pressure sensor is used to measure the water depth data of the probe; preferably, the underwater sealing functional part is connected to the signal and power supply cables of the acoustic wave sensor and the pressure sensor through the load-bearing cable, and the joints are sealed with glue to realize an underwater integrated composite cable with load-bearing capacity, and lead powder is added inside the underwater sealing functional part.

[0012] Furthermore, in the measuring probe, the acoustic wave sensor and the pressure sensor are arranged at a high altitude.

[0013] On the other hand, the present invention provides a method for measuring the thickness of sea mud in a pump room of a nuclear power plant using the device described in the claim, the method comprising: step 1, moving the measuring device to above the sea mud measuring port; step 2, adjusting the left and right adjusting wheels of the probe and the front and rear adjusting wheels of the probe position adjusting mechanism so that the measuring probe moves to the middle position just above the sea mud side port; step 3, inputting preset parameter values ​​Ha, Hb, Hc and alarm threshold, Ha is the height of the cable pulley from the ground, Hb is the distance between the sea mud measuring port and the bottom surface of the nuclear power plant pump room, and Hc is the water immersion depth of the sensor; step 4, controlling the lifting and transmission system to gradually release the cable, and using the pressure sensor to measure the current pressure in real time; step 5, calculating the water immersion depth Hc of the pressure sensor based on the measured current pressure; step 6, when the water immersion depth reaches the preset value, controlling the lifting and transmission system to stop releasing the cable, and when the pressure exceeds the preset value, winding the cable, repeating this step until the water immersion depth reaches the preset value; step 7, locking the parameters of the acoustic wave sensor at the set water immersion depth Hc;

[0014] Step 8: Use the acoustic wave sensor to start measuring the distance Hd from the acoustic wave sensor to the sea mud surface;

[0015] Step 9: Calculate the sea mud thickness Hy=Ha+Hb-H-Hd according to the initial setting value and the measurement value of the acoustic sensor;

[0016] Step 10: The calculated sea mud thickness value is compared with the initially set sea mud thickness alarm threshold, and an alarm is issued if it exceeds the set threshold.

[0017] The advantages of the present invention are:

[0018] 1. The present invention adopts a mobile control stand as a carrier design, which is convenient for the flexible movement of the measuring device, and can realize the use of multiple measuring ports of one device, which has good economy.

[0019] 2. The present invention integrates control, measurement, calculation, display and alarm, simplifies the traditional measurement process and preliminary preparation work, and improves the efficiency of on-site sea mud measurement.

[0020] 3. The present invention can realize one-key measurement of underwater sea mud thickness and one-key recovery of the measuring probe, avoiding complicated and cumbersome operation procedures. At the same time, there is no need to consider the water level depth of the measuring port during measurement.

[0021] 4. The present invention adopts a probe position adjustment mechanism, which can realize continuous measurement of any point in the measuring port by moving the measuring probe forward, backward, left and right, thereby improving the reliability of sea mud measurement data.

[0022] 5. The present invention adopts underwater sealing functional parts to realize integrated composite measurement of multiple sensors in a single cable, thereby improving the sealing of underwater connections and the reliability of system wiring. In addition, the present invention effectively avoids the disturbance of underwater undercurrent agitation on the measuring sensor through measurement depth selection and the use of underwater sealing functional parts, thereby improving the measurement accuracy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the external structure of the integrated automatic measuring device for the thickness of sea mud in a nuclear power plant pump room of this embodiment; Figure 2 Schematic diagram of the internal structure of the integrated automatic measuring device for sea mud thickness in a nuclear power plant pump room of this embodiment;

[0024] Figure 3 A schematic structural diagram of an underwater sealing functional component of an integrated automatic measuring device for sea mud thickness in a nuclear power plant pump room provided in this embodiment; Figure 4 A schematic diagram of the measuring principle when the measuring device of the present invention is used for measurement; Figure 5 This is an ultrasonic image when the measurement probe of the present invention is not used for measurement; Figure 6 This is an ultrasonic image collected after monitoring depth positioning using the measuring probe of the present invention.

[0025] Figure 7 A schematic diagram of the structure of another preferred underwater sealing functional component. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1-2 The figure shows the structure of an integrated automatic measuring device for the thickness of sea mud in a nuclear power plant pump room in an embodiment of the present application. Figure 1As shown, the integrated automatic measuring device for sea mud thickness may include a mobile control stand 01, an indicator light and switch 02, a speed regulator 03, a coulometer 04, an operating handle 05, a stainless steel keyboard 06, an electric control cabinet 07, an embedded display screen 08, a front directional wheel 09, a rear universal wheel 10, a controller 11, a battery 12, a probe left and right adjustment wheel 13, a probe front and rear adjustment wheel 14, a probe position adjustment mechanism 15, a cable pulley 16, a cable winch assembly 17, an electric drum reel 18, an underwater sealing functional part 19, and a measuring probe 20. The measuring probe includes an ultrasonic transducer and a static immersion pressure sensor.

[0028] like Figure 1-2 As shown, the indicator lights and switches, speed regulator, coulomb meter, operating handle, stainless steel keyboard, and embedded display screen are all installed on the front panel of the mobile control stand. In this embodiment, the display and operating switches installed on the front panel facilitate the operator to observe and operate the measurement data of the device intuitively; the front fixed wheel and rear universal wheel are respectively installed on the front and rear four feet of the mobile control stand. In this embodiment, the fixed wheel is used at the front end to facilitate the fit with the measuring port limiter, and the universal wheel is used at the rear end to facilitate the operator to flexibly turn and position the device. At the same time, the rear universal wheel has a brake function. After the measurement position is determined, the brake function is used to lock the device directly above the measuring port to meet the reliable measurement requirements.

[0029] like Figure 1-3 As shown, the controller is connected to the cable winch assembly and is used to control the rise and fall of the underwater sealing functional part and the measuring probe. In this embodiment, the corresponding preset values ​​are pre-set in the controller. The controller will control the rise, fall or stop of the measuring probe connected to it according to the position information fed back by the encoder in the cable winch assembly and the pressure information fed back by the measuring probe and the above preset values, which greatly facilitates the applicability of the system in different measurement environments; wherein the above preset values ​​include but are not limited to each rise and fall speed, initial position, water immersion depth, alarm threshold, etc.

[0030] like Figure 1-3As shown, the cable hoisting assembly is connected to the cable pulley through the load-bearing cable. In this embodiment, the cable hoisting assembly includes a servo motor, a planetary reducer, a cable drum, an electric slip ring, a code disk, etc., wherein the driving motor selects a low-voltage DC servo motor to achieve high-precision free control and has the advantages of low speed and high torque; the reducer selects an L-type precision planetary reducer with a reduction ratio of 1:30 and is designed to be 15-30 rpm; the servo motor drives the planetary reducer, which drives the cable drum as the final output power to realize the retraction and release of the load-bearing cable, and an electric slip ring is installed at one end of the central axis of the cable drum to realize reliable connection of the cable connector; the code disk is installed at the position of the servo motor shaft, and the controller obtains the number of circle pulses of the code disk, the known speed ratio and the drum radius, so as to quickly obtain the absolute position information of the movement of the measuring probe; the cable pulley serves as the support point for the cable hoisting assembly and the underwater sealing functional part to be connected through the load-bearing cable, which can realize the guidance and arrangement of the load-bearing cable as it rises and falls.

[0031] like Figure 1-3 As shown, the cable pulley is installed on the probe position adjustment mechanism, through which the position of the cable pulley is adjusted, thereby controlling the position of the rangefinder (measuring probe).

[0032] In this embodiment, the cable pulley is installed on the guide rails of the cross beams on both sides of the probe position adjustment mechanism, and the middle position of the bottom of the cable pulley is fixed to the sliding bolt on the middle screw rod of the probe position adjustment mechanism. The left and right movement of the cable pulley is achieved by shaking the left and right adjustment hand wheel of the probe. The two ends of the probe position adjustment mechanism are installed on the guide rails on the left and right sides of the mobile control platform. The front and rear movement of the cable pulley and the probe position adjustment mechanism is achieved by shaking the front and rear adjustment hand wheel of the probe. Since the cable pulley serves as the supporting point for the through connection of the above-mentioned load-bearing cable, the movement of the cable pulley further drives the position movement of the underwater sealing functional component and the measuring probe. In this embodiment, the maximum movement range of the underwater sealing functional component and the measuring probe at the measuring port is adjusted to 450mm×400mm.

[0033] like Figure 1-3 As shown, the measuring probe is connected to the controller through the armored cable. In this embodiment, the measuring probe is mainly composed of an acoustic sensor and a pressure sensor. The acoustic sensor scans the sea mud at the bottom of the measuring port through echo reflection. The controller obtains the measurement signal of the acoustic sensor through the armored cable, and obtains the distance data and scanning image information from the measuring probe to the sea mud surface after analysis and processing; the pressure sensor adopts a static immersion pressure sensor to realize the real-time measurement of the water depth of the measuring probe, ensuring that the measuring probe is always at a certain distance underwater.

[0034] like Figure 1As shown, the electric drum cord reel is connected to the battery. In this embodiment, the electric drum cord reel is used to connect the battery to the mains when the battery needs to be charged, so as to realize the quick plug-in and unplugging and retracting of the charging cable; the battery has a built-in charger to realize the conversion of the mains into usable direct current, and at the same time, a built-in inverter is built in to realize the conversion of the battery's direct current to alternating current, so as to meet the needs of some equipment in the device for an alternating current power supply. At the same time, the above-mentioned battery is connected to the coulomb meter, and the battery power is monitored in real time by the coulomb meter and displayed on the built-in LCD screen to ensure that the battery power is sufficient for each measurement operation. The battery capacity of this embodiment is 72V / 40AH. Once the battery is fully charged, it can meet the continuous operation of the device for not less than 6 hours.

[0035] The indicator lights and switches are connected to the controller. In this embodiment, the indicator lights and switches include: a start button, a start indicator light, a recovery button, a recovery indicator light, an emergency stop button, a shutdown indicator light, and a fault indicator light; the start button is connected to the controller I / O and sends a whole machine start instruction to the controller. The controller starts the power supply switch of other devices in the device by controlling the output of the I / O, and lights up the start indicator light; the recovery button is a one-key recovery. After the measurement of the measuring probe is completed, the button sends a one-key recovery instruction to the controller I / O, and lights up the start indicator light, and the measuring probe is automatically retracted into the electric control box; the emergency stop button is connected to the controller I / O. When the measuring probe is in the rising and falling state, the button sends an emergency stop instruction to the controller I / O, and lights up the shutdown indicator light, the cable winch assembly is emergency braked, and automatically locked, so as to effectively protect the measuring probe in an emergency state; the fault indicator light mainly indicates the state of abnormal reading of data and operation instructions by the controller.

[0036] The operating handle is connected to the controller. In this embodiment, the operating handle is used to control the descent of the measuring probe, and is divided into three gears: low speed, medium speed and high speed. The operating handle is connected to the controller I / O. When the operating handle is turned to the low speed gear, the controller I / O obtains a descent operation instruction, and the controller drives the servo motor to rotate at a low speed in the descent direction until the measuring probe reaches a preset descent depth, locks the cable winding assembly, and turns the operating handle back to the initial position to complete the measurement; the operating principle of the medium and high speed gears is the same as that of the low speed gear, and will not be repeated.

[0037] The stainless steel keyboard and the embedded display screen are connected to the controller. In this embodiment, the display serves as an interactive window between the operator and the controller. The display mainly displays information including the echo image information of the acoustic sensor, distance information, distance information of the pressure sensor, initial position setting information, water depth setting information of the measuring probe, sea mud thickness information and alarm threshold information; the stainless steel keyboard can reset the parameters of the above setting information of the controller.

[0038] like Figure 3 As shown, it is a composition diagram of the underwater sealing functional parts of the integrated automatic measuring device for sea mud thickness in the pump room of a nuclear power plant in this embodiment. In this embodiment, an armored cable bearing lock (0201) sealing device is designed on the top of the underwater sealing functional component mounting seat, which is sealed and connected to the bearing cable; the base is designed with a cable junction box (0203), and the bearing cable and the sound wave (0206) and pressure (0205) sensors of the above-mentioned measuring probe are connected by signal lines and power lines in the cable junction box, and the cable junction box (0203) is a two-half flange connection for easy maintenance; the sound wave (0206) and pressure (0205) sensors are connected to the fixing plate (0204) and fixed by bolts, and the structure is stable and reliable and will not fall off; a counterweight block (0202) of the required weight is installed as needed to ensure that the measuring probe does not produce a large angle deviation when it is impacted and agitated by water flow at the bottom of the water; the underwater sealing functional component adopts an inverted T-shaped bracket to realize the load-bearing at the connection between the above-mentioned armored cable and the sealing cabin, adopts a vulcanized rubber sealing chamber for secondary sealing, and selects a rubber O-ring to realize the sealing of the contact part with the sealing cabin.

[0039] like Figure 7 As shown, a perspective structural diagram of a preferred underwater sealing functional component is provided. Figure 3The position of the middle counterweight lead block (correspondingly, the cable junction box (0203) can be omitted or retained. If omitted, the fixing plate is directly installed below the lower sealing plate of the functional part). As can be seen from the figure, a single armored cable is connected to the upper part thereof, and the armored cable is sealed to realize the load-bearing and signal transmission tasks of a single cable. The internal signal line of the armored cable and the armored cable bearing locking sealing device are connected to the upper part of the underwater sealing functional part; the upper part of the underwater sealing functional part adopts an inverted T-shaped bracket to realize the load-bearing at the connection between the above-mentioned armored cable and the sealed cabin. The underwater functional seal is a cylindrical structure, and an isolation plate is arranged inside. The middle part of the isolation plate is hollow to allow the signal line of the armored cable to pass downward from the middle. The outer ring part of the middle and lower part of the cylindrical structure carries the counterweight lead powder or lead block through the isolation plate. The depth measuring transducer and the pressure sensor are installed side by side below the lower bottom plate of the sealing functional part. The signal lines of the two sensors pass through the lower sealing plate of the sealing functional part to connect to the inside of the sealing functional part. The signal lines of the two sensors are respectively connected to different lines of the armored cable inside the sealing functional part to realize the single cable transmission of the signal. The underwater sealing functional parts adopt vulcanized rubber sealing chamber for secondary sealing, and rubber O-rings are selected to achieve sealing of the contact parts with the sealing cabin.

[0040] like Figure 4 As shown, when performing depth measurement, the water depth Hc is first given, which is 1m in this embodiment. The preset water depth of the acoustic wave sensor is input into the controller as a given parameter of the control system; the controller controls the servo motor of the cable winch assembly to release the cable (armored cable); and then controls the rise / descent of the measuring probe; the pressure sensor measures the pressure caused by the water depth in real time, and the controller calculates the water depth based on the pressure. The controller compares the measured water depth value with the given water depth parameter value. When there is a positive deviation, the controller drives the servo system to descend, and when there is a negative deviation, the controller drives the servo system to rise, so as to ensure that the acoustic wave sensor is at the set water depth; numerical filtering is to perform a first-order low-pass filtering process on the measured water depth value to avoid high-frequency interference of the measurement environment on the data. An underwater seal is set above the acoustic wave sensor and the pressure sensor, and a communication connection is made through the underwater seal. The signals generated by the two are connected to the cable through a cable connection box, and a counterweight lead block is set above the acoustic wave sensor and the pressure sensor, which is fixedly connected to the cable connection box.

[0041] More specifically, the use process of the present invention is as follows:

[0042] Step 1, moving the measuring device to the top of the sea mud measuring port; Step 2, adjusting the probe left and right adjusting wheels (13) and the probe front and rear adjusting wheels (14) of the probe position adjusting mechanism (15) so that the measuring probe moves to the middle position just above the sea mud side port; Step 3, inputting preset parameter values ​​Ha, Hb, Hc and alarm threshold, Ha is the height of the cable pulley from the ground, Hb is the distance between the sea mud measuring port and the bottom surface of the nuclear power plant pump room, and Hc is the water immersion depth of the sensor; Step 4, controlling the lifting transmission system to gradually release the cable, and using the pressure sensor to measure the current pressure in real time; Step 5, calculating the water immersion depth Hc of the pressure sensor based on the measured current pressure; Step 6, when the water immersion depth reaches a preset value, controlling the lifting transmission system to stop releasing the cable, and when the pressure exceeds the preset value, winding the cable, repeating this step until the water immersion depth reaches the preset value; Step 7, locking the parameters of the acoustic wave sensor at the set water immersion depth Hc;

[0043] Step 8: Use the acoustic wave sensor to start measuring the distance Hd from the acoustic wave sensor to the sea mud surface;

[0044] Step 9: Calculate the sea mud thickness Hy=Ha+Hb-H-Hd according to the initial setting value and the measurement value of the acoustic sensor;

[0045] Step 10: The calculated sea mud thickness value is compared with the initially set sea mud thickness alarm threshold, and an alarm is issued if it exceeds the set threshold.

[0046] In the embodiment of the present application, the controller is connected to the servo system to control the automatic lifting of the acoustic wave sensor and the pressure sensor; the pressure sensor is connected to the controller through the electric slip ring, and combined with the control strategy, it is ensured that the acoustic wave sensor 9 reaches the preset water immersion depth; the acoustic wave sensor is connected to the controller through the electric slip ring to realize the sea mud scanning image and the distance measurement from the acoustic wave sensor to the sea mud surface; the distance Hd from the acoustic wave sensor to the sea mud surface, the servo system travel distance H, the initially preset distance Hb from the measuring port to the bottom of the sea mud, and the height Ha of the cable reel from the ground obtained by the controller are substituted into the formula: Hy=Ha+Hb-H-Hd, and the actual thickness measurement value of the sea mud will be automatically obtained. Finally, the controller can complete the output presentation of the measurement results in different forms through the display, the DTU terminal and the printer.

[0047] By means of the device of the present invention, the water immersion depth during measurement can be accurately determined based on the pressure sensor, thereby ensuring the stability of the measurement signal.

[0048] In the embodiment of the present application, the controller is connected to the cable winding assembly, and is used to control the automatic lifting and lowering of the underwater sealing functional part and the measuring probe; the measuring probe is connected to the cable winding assembly through a load-bearing cable, and is used to move the measuring probe to a preset water depth through the cable winding assembly; the measuring probe is connected to the controller through a load-bearing cable, and is used for the controller to obtain the sea mud thickness scanning image and thickness information, and the distance from the measuring probe to the sea mud surface, the water depth information, and the information from the measuring port to the sea mud bottom obtained by the controller, and the actual thickness measurement value of the sea mud is automatically obtained by simple calculation, and finally displayed on the embedded display screen. This process saves labor costs by automatically lifting and measuring, thereby improving overall efficiency.

Claims

1. A mobile nuclear power pump room sea mud thickness automatic measuring device, characterized in that: It includes a mobile control platform, a control system, a display system, a lifting transmission system, a probe position adjustment mechanism and underwater sealing functional parts. The mobile control platform is used to install the control system, display system, lifting transmission system, probe position adjustment mechanism and underwater sealing functional parts; The control system is used to control the lifting transmission system and the probe position adjustment mechanism, thereby controlling the lifting and lowering movement of the underwater sealing functional part. The lifting transmission system includes a cable pulley, a cable hoisting assembly, and an electric drum reel. The cable wound on the cable hoisting assembly is connected to the underwater sealing functional component via the cable pulley and the electric drum reel. A measuring probe is fixed below the underwater sealing functional component. The probe position adjustment mechanism includes left and right adjustment wheels of the measuring probe, front and rear adjustment wheels of the probe, and a pulley frame. The cable pulley is installed on the pulley frame and can move with the adjustment of the left and right adjustment wheels of the probe and the front and rear adjustment wheels of the probe. The cable is connected to the underwater sealing functional component via the cable pulley. The measuring probe is fixed below the underwater sealing functional component. The probe position adjustment mechanism includes left and right adjustment wheels of the measuring probe, front and rear adjustment wheels of the probe, and a pulley frame. The cable pulley is installed on the pulley frame and can move with the adjustment of the left and right adjustment wheels of the probe and the front and rear adjustment wheels of the probe. The cable is connected to the underwater sealing functional component via the cable pulley. The lower sealing function part is connected to the load-bearing cable. The measuring probe includes an acoustic sensor and a pressure sensor. The acoustic sensor is used to measure the distance from the measuring probe to the silt, and the pressure sensor is used to measure the water depth data of the measuring probe. The underwater sealing function part is connected to the signal and power supply cables of the acoustic sensor and the pressure sensor through the load-bearing cable, and the joints are sealed with glue to realize an underwater integrated composite cable with load-bearing capacity. At the same time, lead powder is added inside the underwater sealing function part. In the measuring probe, the acoustic sensor and the pressure sensor are arranged at the same height. During measurement, the lifting transmission system is controlled to gradually release the cable, and the current pressure is measured in real time using the pressure sensor; the water immersion depth Hc of the pressure sensor is calculated based on the measured current pressure; when the water immersion depth reaches a preset value, the lifting transmission system is controlled to stop releasing the cable, and when the pressure exceeds the preset value, the cable is wound, and this step is repeated until the water immersion depth reaches the preset value.

2. The automatic measuring device for sea mud thickness according to claim 1 is characterized in that: The mobile control platform comprises front fixed wheels, rear universal wheels and an electric control cabinet. The front fixed wheels and the rear universal wheels are automatically and accurately positioned above the measuring port through limiting guide rails installed on site.

3. The automatic measuring device for sea mud thickness according to claim 2 is characterized in that: It also includes a speed regulator, which is installed on the front panel of the mobile control platform and is used to control the change of the driving hoisting speed of the cable hoisting component of the lifting transmission system in the same gear.

4. The automatic measuring device for sea mud thickness according to claim 2 is characterized in that: It also includes a coulomb meter and a battery. The coulomb meter is installed on the front panel of the mobile control platform and is used to measure the battery power to achieve real-time monitoring of the battery power.

5. The automatic measuring device for sea mud thickness according to claim 3 is characterized in that: It also includes an operating handle, which is installed on the front panel of the mobile control platform and is used to control the rise and fall of the cable winch assembly. The operating handle is set to three gears to control the low-speed, medium-speed and high-speed rise or fall of the cable winch assembly.

6. The automatic measuring device for sea mud thickness according to claim 3 is characterized in that: The cable winding assembly controls the automatic retraction and extension of the cable through the combination of a cable pulley and a probe position adjustment mechanism.

7. The automatic measuring device for sea mud thickness according to claim 6 is characterized in that: The probe position adjustment mechanism drives the cable pulley to move forward, backward, left and right through manual control of the probe left and right adjustment wheels and the probe front and back adjustment wheels, and further drives the measuring probe to move forward, backward, left and right, ultimately achieving movement and adjustment of the measuring probe to any point on the measuring port plane.

8. A method for measuring the thickness of sea mud in a nuclear power plant pump room using the device according to any one of claims 1 to 7, the method comprising: Step 1, moving the measuring device above the sea mud measuring port; Step 2: adjusting the probe left and right adjustment wheels and the probe front and rear adjustment wheels of the probe position adjustment mechanism so that the measuring probe moves to the middle position just above the side opening of the sea mud; Step 3, input preset parameter values ​​Ha, Hb, Hc and alarm threshold, Ha is the height of the cable pulley from the ground, Hb is the distance between the sea mud measuring port and the bottom of the nuclear power plant pump room, and Hc is the water immersion depth of the sensor; Step 4: Control the lifting transmission system to gradually release the cable, and use the pressure sensor to measure the current pressure in real time; Step 5: Calculate the water immersion depth Hc of the pressure sensor based on the measured current pressure; Step 6: When the water depth reaches a preset value, the lifting transmission system is controlled to stop releasing the cable. When the pressure exceeds the preset value, the cable is wound, and this step is repeated until the water depth reaches the preset value. Step 7, locking the parameters of the acoustic wave sensor at the set water immersion depth Hc; Step 8: Use the acoustic wave sensor to start measuring the distance Hd from the acoustic wave sensor to the sea mud surface; Step 9: Calculate the sea mud thickness Hy=Ha+Hb-H-Hd according to the initial setting value and the measurement value of the acoustic sensor; Step 10: The calculated sea mud thickness value is compared with the initially set sea mud thickness alarm threshold, and an alarm is issued if it exceeds the set threshold.

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