Watertight protection device for measuring instrument and shipborne measuring instrument

Abstract

The invention relates to the technical field of ships, and discloses a watertight protection device for a measuring instrument. The watertight protection device comprises a watertight door, a measuring cabin and a control system, an opening is formed in the bottom of the measuring cabin, the watertight door is installed in the measuring cabin and can open or seal the opening, an inflation assembly is arranged on the measuring cabin, and the inflation assembly is used for being communicated with an external air source so as to provide compressed air into the measuring cabin, so that the internal air pressure of the measuring cabin is higher than the external air pressure of the measuring cabin; the control system is electrically connected with the watertight door, and the control system is configured to obtain a measurement work instruction and control the watertight door to open the opening when the internal air pressure of the measurement cabin is greater than the external air pressure. The measuring instrument can be fixedly installed at the bottom of the ship, the detection probe extends out to achieve the purpose of measurement and investigation, and water outside the measuring cabin cannot enter the measuring cabin.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a watertight protection device for a measuring instrument and a ship-borne measuring instrument. Background Art

[0002] At present, the measuring instrument used for accurate measurement of water depth has the notable feature of real-time attitude measurement and high installation accuracy. The installation methods of the measuring instrument can be divided into portable installation on the hull, installation in the measuring well and fixed installation on the bottom of the ship.

[0003] The portable installation on the hull adopts a rotating arm method to install the measuring instrument on the port or starboard side or bow of the ship, and connects the measuring instrument through a rotatable support rod. The disadvantage is that the safety of the measuring instrument is reduced, and the posture of the measuring instrument is unstable when the ship is sailing at high speed, which affects the quality of the survey data; the bow is the position where the vertical heave and sink movement of the hull is most intense. When encountering severe sea conditions, the probe of the measuring instrument is easily exposed to the water surface due to insufficient draft, resulting in gaps in the depth data. It takes a lot of time to remeasure these data, which reduces the operation efficiency.

[0004] The measurement well is installed by digging a vertical shaft at the stern of the survey ship and fixing the measuring instrument in the shaft. This not only ensures the accuracy and efficiency of the survey, but also has the characteristic of convenient disassembly of scientific measuring instruments. However, the cost of digging the vertical shaft is high, the existing vertical shaft installation technology is not mature, and it is affected by the water flow, vibration and noise caused by the tail propeller, etc., and there are many disadvantages.

[0005] As for the fixed installation method on the bottom of the ship, the door or hole of the bottom cabin needs to be opened and the detection probe extended during the normal navigation and stop of the survey ship to achieve the purpose of measurement and investigation. Conventional survey ships cannot achieve this function. Summary of the invention

[0006] The purpose of the present invention is to realize the fixed installation of the measuring instrument on the bottom of the ship, to extend the detection probe to achieve the purpose of measurement and investigation, and the water outside the measuring cabin will not enter the measuring cabin.

[0007] In order to achieve the above-mentioned object, the present invention provides a watertight protection device for a measuring instrument, comprising a watertight door, a measuring cabin and a control system;

[0008] An opening is provided at the bottom of the measurement cabin, a watertight door is installed on the measurement cabin and is capable of opening or sealing the opening, and an inflation assembly is provided on the measurement cabin, the inflation assembly is used to communicate with an external gas source to provide compressed gas into the measurement cabin, so that the internal air pressure of the measurement cabin is higher than the external air pressure of the measurement cabin;

[0009] The control system is electrically connected to the watertight door and is configured as follows:

[0010] Obtain measurement work instructions, and when the internal air pressure of the measurement cabin is greater than the external air pressure, control the watertight door to open.

[0011] Further, the watertight door is rotatably connected to the inside of the measurement cabin, and the watertight door can be rotated inside the measurement cabin to open or seal the opening.

[0012] Further, the watertight door comprises a door body, a door shaft and a cylinder assembly, wherein the door shaft is rotatably connected to the interior of the measuring cabin and is located on one side of the opening, the door body is fixedly connected to the door shaft and can rotate with the door shaft, and both ends of the cylinder assembly are respectively fixedly connected to the measuring cabin and the door body, and the cylinder assembly can drive the door body to rotate to open or seal the opening;

[0013] The specific control of the watertight door to open the opening includes: the cylinder assembly drives the door body to rotate to open the opening.

[0014] Furthermore, the door body includes a connecting portion and a buckling portion. The buckling portion is arranged on a side of the connecting portion close to the opening. The connecting portion is connected to the door shaft. When the watertight door seals the opening, the connecting portion covers the opening, and the buckling portion extends from the opening to the outside of the measuring cabin.

[0015] Furthermore, the watertight protection device for the measuring instrument further comprises a hydraulic pump station, and the cylinder assembly comprises a hydraulic cylinder, a piston rod, a first pipeline and a second pipeline;

[0016] The hydraulic cylinder is fixed on the measuring cabin, one end of the piston rod is fixedly connected to the door body, the end of the piston rod away from the door body is fixedly connected to the piston, the piston rod and the piston are both accommodated in the hydraulic cylinder and slidably connected to the hydraulic cylinder, the piston divides the internal space of the hydraulic cylinder into a first chamber and a second chamber, the first chamber is connected to the first pipeline, the second chamber is connected to the second pipeline, the first pipeline and the second pipeline are both connected to the hydraulic pump station, and the hydraulic pump station is arranged outside the measuring cabin;

[0017] The hydraulic pump station is electrically connected to the control system. The hydraulic pump station recovers hydraulic oil from the first chamber to push the piston to slide toward the second chamber, so that the door body can be opened into the measuring cabin.

[0018] Furthermore, there are multiple cylinder assemblies, and the multiple cylinder assemblies are arranged at intervals along the extension direction of the door body.

[0019] Furthermore, the watertight protection device for the measuring instrument also includes an electromagnetic conversion valve, which is installed on the first pipeline and the second pipeline and is located outside the measuring cabin. The first pipeline is connected to the output end of the hydraulic pump station, and the second pipeline is connected to the input end of the hydraulic pump station. The electromagnetic conversion valve can convert the first pipeline to be connected to the input end of the hydraulic pump station, and the second pipeline to be converted to be connected to the output end of the hydraulic pump station.

[0020] Furthermore, the watertight door further comprises a sealing groove and a sealing ring, wherein the sealing groove is provided at the edge of the door body, and the sealing ring is fixedly connected to the door body and accommodated in the sealing groove;

[0021] And / or, the door body is made of stainless steel.

[0022] Furthermore, a camera is provided in the measuring cabin, and the camera is used to monitor the use status of the watertight door;

[0023] And / or a pressure sensor is installed in the measuring cabin, the pressure sensor is used to obtain the internal air pressure of the measuring cabin to adjust the supply of compressed gas, the pressure sensor is electrically connected to the control system, and the control system is configured to obtain the internal air pressure of the measuring cabin through the pressure sensor.

[0024] A shipborne measuring instrument comprises a measuring component and the watertight protection device for the measuring instrument as described above;

[0025] The measuring assembly includes a measuring instrument and a telescopic part, wherein the measuring instrument is fixedly connected to one end of the telescopic part, and the other end of the telescopic part is fixedly connected to the measuring cabin, and the telescopic part can make the measuring instrument extend out of the measuring cabin or retract into the measuring cabin;

[0026] The control system is also configured to:

[0027] When the watertight door is opened, the telescopic part is controlled to extend so that the measuring instrument is extended out of the measuring cabin, and the measuring instrument is started to perform measurement.

[0028] Compared with the prior art, the watertight protection device for a measuring instrument in an embodiment of the present invention has the following beneficial effects: the watertight protection device for the measuring instrument in the embodiment installs a watertight door on the bottom opening of the measuring cabin in the ship, and when the probe measuring device of the shipborne measuring instrument in the measuring cabin needs to be extended out of the cabin for work, the inflation assembly in the measuring cabin is turned on, so that the air pressure inside the measuring cabin is higher than the air pressure outside the measuring cabin, and the watertight door is opened, so that seawater will not enter the measuring cabin under the pressure difference, and the probe measuring device can be extended out of the cabin for work; when the measurement is completed, the probe measuring device of the shipborne measuring instrument in the measuring cabin is retracted into the measuring cabin and is not working, the watertight door seals the opening and remains closed to prevent seawater outside the hull from entering the measuring cabin.

[0029] The measuring instrument is installed at the bottom of the measuring cabin. Compared with the measuring instrument installed on the port or starboard side or bow of the ship, the measuring instrument has a stable posture when the ship is sailing at high speed, and it is not easy to extend out of the water. The measured data has no gaps and is comprehensive, so the measurement data quality is high and the operation efficiency is improved. Compared with the measuring instrument installed in the measuring well, the cost of opening the well is reduced, the economy is good, and it is not affected by the water flow, vibration and noise caused by the tail propeller. The data collected by the measuring instrument in this solution has less interference and the measurement data quality is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a state diagram of a sealed opening of a watertight door according to an embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of an open opening of a watertight door according to an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of an embodiment of the present invention.

[0033] In the figure, 1. Watertight door;

[0034] 11. door body; 111. connecting portion; 112. buckling portion;

[0035] 12. Door axis;

[0036] 13. Cylinder assembly; 131. Hydraulic cylinder; 132. First pipeline; 133. Second pipeline;

[0037] 14. Sealing groove; 15. Sealing ring;

[0038] 2. Measurement cabin; 21. Opening;

[0039] 3. Hydraulic pump station; 4. Solenoid conversion valve; 5. Accumulator. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] like Figure 1 to Figure 3As shown, a watertight protection device for a measuring instrument in a preferred embodiment of the present invention comprises a watertight door 1, a measuring cabin 2 and a control system; an opening 21 is provided at the bottom of the measuring cabin 2, the watertight door 1 is installed on the measuring cabin 2, and can open or seal the opening 21, an inflation component is provided on the measuring cabin 2, and the inflation component is used to communicate with an external air source to provide compressed gas into the measuring cabin 2, so that the internal air pressure of the measuring cabin 2 is higher than the external air pressure of the measuring cabin 2; the control system is electrically connected to the watertight door 1, and the control system is configured to: obtain a measurement work instruction, and when the internal air pressure of the measuring cabin 2 is greater than the external air pressure, control the watertight door 1 to open the opening 21.

[0044] Based on the above scheme, the working process is as follows: the watertight protection device for the measuring instrument in this embodiment installs the watertight door 1 on the bottom of the measuring cabin 2 in the ship. When the probe measuring device of the shipborne measuring instrument in the measuring cabin 2 needs to be extended out of the cabin to work, the inflation component in the measuring cabin 2 is opened, so that the air pressure inside the measuring cabin 2 is higher than the air pressure outside the measuring cabin 2, and the watertight door 1 is opened, so that seawater will not enter the measuring cabin 2 under the pressure difference, and the probe measuring device can be extended out of the cabin to work; when the measurement is completed, the probe measuring device of the shipborne measuring instrument in the measuring cabin 2 is retracted into the measuring cabin 2 and is not working, the watertight door 1 is closed and the opening 21 is sealed, and the closed state is maintained to prevent seawater outside the hull from entering the measuring cabin 2.

[0045] The measuring instrument is installed at the bottom of the measuring cabin 2. Compared with the measuring instrument installed on the port or starboard side or bow of the ship, the measuring instrument has a stable posture when the ship is sailing at high speed, and it is not easy to extend out of the water. The measured data has no gaps and is comprehensive, so the measurement data quality is high and the operation efficiency is improved. Compared with the measuring instrument installed in the measuring well, the cost of opening the well is reduced, the economy is good, and it is not affected by the water flow, vibration and noise caused by the tail propeller. The data collected by the measuring instrument in this solution has less interference and the measurement data quality is high.

[0046] Preferably, the watertight door 1 is rotatably connected to the inside of the measuring cabin 2, and the watertight door 1 can be rotated inside the measuring cabin 2 to open or seal the opening 21. The inward rotation of the watertight door 1 means that the watertight door 1 does not occupy the space outside the measuring cabin 2 when opened, which is helpful for opening the door to operate the measuring instrument in the underwater or other similar narrow environments. The watertight door 1 is arranged inside the measuring cabin 2 to prevent being impacted and corroded by seawater.

[0047] Preferably, the watertight door 1 includes a door body 11, a door shaft 12 and a cylinder assembly 13. The door shaft 12 is rotatably connected to the interior of the measuring cabin 2 and is located on one side of the opening 21. The door body 11 is fixedly connected to the door shaft 12 and can rotate with the door shaft 12. The two ends of the cylinder assembly 13 are respectively fixedly connected to the measuring cabin 2 and the door body 11. The cylinder assembly 13 can drive the door body 11 to rotate to open or seal the opening 21. Specifically controlling the watertight door 1 to open the opening 21 includes: the cylinder assembly 13 drives the door body 11 to rotate to open the opening 21.

[0048] Based on the above scheme, when the watertight door 1 needs to be closed and the opening 21 needs to be sealed, the cylinder assembly 13 expands, generates tension outside the measuring cabin 2, and drives the door body 11 to rotate around the door shaft 12 until the door body 11 fits tightly against the opening 21 at the bottom of the measuring cabin 2, thereby sealing the opening 21. When the opening 21 needs to be opened, the cylinder assembly 13 contracts, drives the door body 11 to rotate around the door shaft 12, and the door body 11 rotates around the door shaft 12 under the action of the cylinder assembly 13 until it is fully opened. The introduction of the cylinder assembly 13 automates the sealing and opening process of the watertight door 1, greatly improving the operating efficiency and convenience. The cylinder assembly 13 can provide a stable driving force to ensure that the watertight door 1 can be reliably sealed and opened in various environments.

[0049] Preferably, the door body 11 includes a connecting portion 111 and a buckling portion 112. The buckling portion 112 is arranged on a side of the connecting portion 111 close to the opening 21. The connecting portion 111 is connected to the door shaft 12. When the watertight door 1 seals the opening 21, the connecting portion 111 covers the opening 21, and the buckling portion 112 extends from the opening 21 into the outside of the measurement cabin 2. The connection design of the connecting portion 111 and the door shaft 12 enables the door body 11 to rotate around the door shaft 12, which is convenient for opening and closing. The design of the connecting portion 111 and the buckling portion 112 makes the door body 11 compact in structure, occupies a small space, and is convenient for installation and maintenance.

[0050] Preferably, the watertight protection device for the measuring instrument also includes a hydraulic pump station 3, and the cylinder assembly 13 includes a hydraulic cylinder 131, a piston rod, a first pipeline 132 and a second pipeline 133; the hydraulic cylinder 131 is fixed on the measuring cabin 2, one end of the piston rod is fixedly connected to the door body 11, and the end of the piston rod away from the door body 11 is fixedly connected to the piston, the piston rod and the piston are both accommodated in the hydraulic cylinder 131 and slidably connected to the hydraulic cylinder 131, and the piston divides the internal space of the hydraulic cylinder 131 into a first chamber and a second chamber, the first chamber is connected to the first pipeline 132, and the second chamber is connected to the second pipeline 133, the first pipeline 132 and the second pipeline 133 are both connected to the hydraulic pump station 3, and the hydraulic pump station 3 is arranged outside the measuring cabin 2; the hydraulic pump station 3 is electrically connected to the control system, and the hydraulic pump station 3 recovers hydraulic oil from the first chamber to push the piston to slide to the second chamber, so that the door body 11 can be opened into the measuring cabin 2.

[0051] Based on the above scheme, the working process of this embodiment is as follows: when the watertight door 1 needs to be opened, the hydraulic pump station 3 will recover the hydraulic oil from the first chamber, and will push the piston to slide toward the second chamber. Since the piston rod is connected to the piston, the sliding of the piston will drive the piston rod and the door body 11 connected thereto to rotate toward the inside of the measuring cabin 2, thereby realizing the opening of the watertight door 1. The hydraulic pump station 3 is arranged outside the measuring cabin 2 to ensure that during the operation, the staff can operate outside the measuring cabin 2 and leave the measuring cabin 2 inflated with medium and high pressure by the inflation assembly. Not only does it not require manual door opening and closing, but it is also more automated and safer.

[0052] Preferably, there are multiple cylinder assemblies 13, and the multiple cylinder assemblies 13 are arranged at intervals along the extension direction of the door body 11. The interval arrangement of the multiple cylinder assemblies 13 enhances the stability and sealing effect of the watertight door 1. In the closed state, even if one of the cylinder assemblies 13 fails or its performance deteriorates, the other cylinder assemblies 13 can still continue to function, keep the watertight door 1 tightly fitted, seal the opening 21, and prevent moisture from intruding.

[0053] Preferably, the watertight protection device for the measuring instrument also includes an electromagnetic conversion valve 4, which is installed on the first pipeline 132 and the second pipeline 133 and is located outside the measuring cabin 2. The first pipeline 132 is connected to the output end of the hydraulic pump station 3, and the second pipeline 133 is connected to the input end of the hydraulic pump station 3. The electromagnetic conversion valve 4 can convert the first pipeline 132 to be connected to the input end of the hydraulic pump station 3, and the second pipeline 133 to be converted to be connected to the output end of the hydraulic pump station 3.

[0054] Based on the above scheme, the working process of this embodiment is as follows: when the watertight door 1 is closed, the electromagnetic conversion valve 4 keeps the second pipeline 133 connected to the output end of the hydraulic pump station 3, and the first pipeline 132 connected to the input end of the hydraulic pump station 3. When the state of the watertight door 1 needs to be changed, the electromagnetic conversion valve 4 responds, converts the first pipeline 132 to the input end of the hydraulic pump station 3, and converts the second pipeline 133 to the output end of the hydraulic pump station 3. This conversion process reverses the flow direction of the hydraulic oil, thereby driving the piston and the piston rod to move in opposite directions, and the first pipeline 132 of the electromagnetic conversion valve 4 is connected to the output end of the hydraulic pump station 3, and the first pipeline 132 is connected to the input end of the hydraulic pump station 3, so that the watertight door 1 is opened.

[0055] Preferably, the watertight door 1 further comprises a sealing groove 14 and a sealing ring 15. The sealing groove 14 is opened at the edge of the door body 11. The sealing ring 15 is fixedly connected to the door body 11 and accommodated in the sealing groove 14, specifically located at the edge of the connecting portion 111 and at the periphery of the buckling portion 112. The sealing ring 15 is fixedly connected to the door body 11 and accommodated in the sealing groove 14. When the watertight door 1 is closed, the sealing ring 15 will be tightly pressed against the edge of the opening 21 of the measuring cabin 2 under the action of pressure, thereby effectively preventing moisture from intruding.

[0056] Preferably, the door body 11 is a stainless steel part. In order to improve the durability and corrosion resistance of the watertight door 1, the door body 11 is preferably a stainless steel part, which not only prolongs the service life of the watertight door 1, but also ensures its reliable operation under various conditions.

[0057] Preferably, a camera is provided in the measuring cabin 2, and the camera is used to monitor the use status of the watertight door 1. The camera helps to improve the safety and reliability of the entire watertight protection device. By continuously monitoring the watertight door 1 and its surrounding environment, the operator can remotely and promptly discover and deal with safety hazards such as water leakage, thereby ensuring the safety of the equipment inside the measuring cabin 2.

[0058] Preferably, a pressure sensor is installed in the measuring cabin 2, and the pressure sensor is used to obtain the internal air pressure of the measuring cabin 2 to adjust the supply of compressed gas. The pressure sensor is electrically connected to the control system, and the control system is configured to obtain the internal air pressure of the measuring cabin 2 through the pressure sensor. Since the external water pressure of the measuring cabin 2 of the ship is almost a constant value, the internal air pressure of the measuring cabin 2 is obtained through the pressure sensor, and the inflatable component is continuously inflated until the internal air pressure of the measuring cabin 2 is higher than the external air pressure of the measuring cabin 2, thereby ensuring the safe operation of the internal equipment and the measuring component of the measuring cabin 2.

[0059] A shipborne measuring instrument includes a measuring component and a watertight protective device for the measuring instrument as described above; the measuring component includes a measuring instrument and a telescopic part, the measuring instrument is fixedly connected to one end of the telescopic part, the other end of the telescopic part is fixedly connected to the measuring cabin 2, and the telescopic part can make the measuring instrument extend out of the measuring cabin 2 or retract into the measuring cabin 2; the control system is also configured to: when the watertight door 1 is opened, control the telescopic part to extend and make the measuring instrument extend out of the measuring cabin 2, and start the measuring instrument to perform measurement. The watertight protective device protects the measuring cabin 2 and the measuring component, and adopts the above-mentioned multiple cylinder components 13, electromagnetic conversion valve 4, sealing groove 14 and sealing ring 15 and other structures to ensure that during the extension or retraction of the measuring instrument, the opening 21 of the measuring cabin 2 can always remain tightly sealed to prevent moisture from intrusion. This not only protects the measuring component from damage, but also ensures the accuracy and reliability of the measurement data.

[0060] Based on all the above schemes, when the door needs to be opened, the control system is configured to: obtain measurement work instructions, the pressure sensor continuously obtains the internal air pressure of the measuring cabin 2, and the inflation component provides compressed gas to the measuring cabin 2. When the internal air pressure of the measuring cabin 2 is greater than the external air pressure, the hydraulic pump station 3 will recover the hydraulic oil from the first chamber and push the piston to slide toward the second chamber. Since the piston rod is connected to the piston, the sliding of the piston will drive the piston rod and the door body 11 connected thereto to rotate toward the inside of the measuring cabin 2, thereby realizing the opening of the watertight door 1.

[0061] In summary, the embodiment of the present invention provides a watertight protection device for a measuring instrument and a shipborne measuring instrument. The watertight protection device for the measuring instrument in this embodiment installs a watertight door 1 on the bottom of a measuring cabin 2 in a ship. When the probe measuring device of the shipborne measuring instrument in the measuring cabin 2 needs to be extended out of the cabin to work, the inflation assembly in the measuring cabin 2 is opened, so that the air pressure inside the measuring cabin 2 is higher than the air pressure outside the measuring cabin 2, and the watertight door 1 is opened, so that seawater will not enter the measuring cabin 2 under the pressure difference; when the measurement is completed, the probe measuring device of the shipborne measuring instrument in the measuring cabin 2 is retracted into the measuring cabin 2 and is not working, the watertight door 1 seals the opening 21 and remains closed to prevent seawater outside the hull from entering the measuring cabin 2.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A watertight protective device for a measuring instrument, characterized in that: Including watertight doors, measurement cabin and control system; The bottom of the measurement cabin is provided with an opening, the watertight door is installed on the measurement cabin and can open or seal the opening, an inflatable component is provided on the measurement cabin, and the inflatable component is used to communicate with an external air source to provide compressed gas into the measurement cabin so that the internal air pressure of the measurement cabin is higher than the external air pressure of the measurement cabin; The control system is electrically connected to the watertight door, and the control system is configured as follows: A measurement work instruction is obtained, and when the internal air pressure of the measurement cabin is greater than the external air pressure, the watertight door is controlled to open the opening.

2. The watertight protection device for a measuring instrument according to claim 1, characterized in that: The watertight door is rotatably connected to the interior of the measurement cabin, and the watertight door can be rotated inside the measurement cabin to open or seal the opening.

3. The watertight protection device for a measuring instrument according to claim 2, characterized in that: The watertight door comprises a door body, a door shaft and a cylinder assembly, wherein the door shaft is rotatably connected to the interior of the measuring cabin and is located at one side of the opening, the door body is fixedly connected to the door shaft and can rotate along with the door shaft, and the two ends of the cylinder assembly are respectively fixedly connected to the measuring cabin and the door body, and the cylinder assembly can drive the door body to rotate to open or seal the opening; Specifically, controlling the watertight door to open the opening includes: the cylinder assembly drives the door body to rotate to open the opening.

4. The watertight protection device for a measuring instrument according to claim 3, characterized in that: The door body includes a connecting portion and a buckling portion, wherein the buckling portion is arranged on a side of the connecting portion close to the opening, and the connecting portion is connected to the door shaft. When the watertight door seals the opening, the connecting portion covers the opening, and the buckling portion extends from the opening into the outside of the measuring cabin.

5. The watertight protection device for a measuring instrument according to claim 3, characterized in that: It also includes a hydraulic pump station, wherein the cylinder assembly includes a hydraulic cylinder, a piston rod, a first pipeline and a second pipeline; The hydraulic cylinder is fixed on the measuring cabin, one end of the piston rod is fixedly connected to the door body, one end of the piston rod away from the door body is fixedly connected to a piston, the piston rod and the piston are both accommodated in the hydraulic cylinder and slidably connected to the hydraulic cylinder, the piston divides the internal space of the hydraulic cylinder into a first chamber and a second chamber, the first chamber is connected to the first pipeline, the second chamber is connected to the second pipeline, the first pipeline and the second pipeline are both connected to the hydraulic pump station, and the hydraulic pump station is arranged outside the measuring cabin; The hydraulic pump station is electrically connected to the control system. The hydraulic pump station recovers hydraulic oil from the first chamber to push the piston to slide toward the second chamber, so that the door body can be opened into the measurement cabin.

6. The watertight protection device for a measuring instrument according to claim 5, characterized in that: There are multiple cylinder assemblies, and the multiple cylinder assemblies are arranged at intervals along the extension direction of the door body.

7. The watertight protection device for a measuring instrument according to claim 5, characterized in that: It also includes an electromagnetic conversion valve, which is installed on the first pipeline and the second pipeline and is located outside the measuring cabin. The first pipeline is connected to the output end of the hydraulic pump station, and the second pipeline is connected to the input end of the hydraulic pump station. The electromagnetic conversion valve can convert the first pipeline to be connected to the input end of the hydraulic pump station, and the second pipeline to be converted to be connected to the output end of the hydraulic pump station.

8. The watertight protection device for a measuring instrument according to claim 3, characterized in that: The watertight door further comprises a sealing groove and a sealing ring, wherein the sealing groove is opened at the edge of the door body, and the sealing ring is fixedly connected to the door body and accommodated in the sealing groove; And / or, the door body is made of stainless steel.

9. The watertight protection device for a measuring instrument according to claim 1, characterized in that: A camera is provided in the measuring cabin, and the camera is used to monitor the use status of the watertight door; And / or a pressure sensor is installed in the measuring cabin, the pressure sensor is used to obtain the internal air pressure of the measuring cabin to adjust the supply of compressed gas, the pressure sensor is electrically connected to the control system, and the control system is configured to obtain the internal air pressure of the measuring cabin through the pressure sensor.

10. A shipborne measuring instrument, characterized in that: It comprises a measuring assembly and a watertight protective device for a measuring instrument as claimed in any one of claims 1 to 9; The measuring assembly comprises a measuring instrument and a telescopic part, wherein the measuring instrument is fixedly connected to one end of the telescopic part, and the other end of the telescopic part is fixedly connected to the inside of the measuring cabin, and the telescopic part can make the measuring instrument extend out of the measuring cabin or retract into the outside of the measuring cabin; The control system is also configured to: When the watertight door is opened, the telescopic part is controlled to extend so that the measuring instrument is extended out of the measuring cabin, and the measuring instrument is started to perform measurement work.

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