A vertical underwater measurement lifting platform mounted on the bottom of a ship

Abstract

This invention discloses a vertically mounted underwater measurement lifting platform on the bottom of a ship, comprising: a control unit, a drive unit, a lifting unit, and a protection unit; the control unit is used to adjust the circuit on / off to control the operation of the drive unit; the drive unit is connected to the lifting unit to provide power output to the system; the lifting unit is used to realize the lifting function of the system; the protection unit is used to provide limit protection, temperature protection, and / or current protection; the protection unit collects the operating status of the drive unit and the lifting unit and outputs it to the main control module of the control unit; using this invention can reduce the system size while realizing the basic lifting function of the platform, improve the reliability and ease of operation of the system, and at the same time, it can lift the equipment into the ship's cabin, ensuring the safety of the equipment and facilitating maintenance.

Description

Technical Field

[0001] This invention relates to the field of underwater detection technology for marine equipment, specifically to a vertically mounted underwater measurement lifting platform on the bottom of a ship. Background Technology

[0002] With the increasing development of marine engineering, more and more marine exploration equipment is being used. Marine survey equipment is mostly composed of underwater acoustic instruments, which are characterized by the requirement for real-time attitude measurement and have high installation requirements.

[0003] Shipborne surveys are the most basic method of marine surveys, and the correct installation of marine survey instruments and equipment is a strong guarantee for obtaining effective survey data. Currently, there are two main installation methods for shipborne survey instruments: fixed mounting on the hull and portable mounting on the ship's side. Fixed mounting on the hull improves the safety, stability, and efficiency of the equipment, but its disadvantages include high installation and disassembly costs and difficulty in maintenance. Portable mounting on the ship's side primarily uses cantilever brackets or shafts to install scientific equipment on the side of the ship. Its advantages are convenient installation and disassembly, but its disadvantages include the measurement equipment being prone to swaying and relative movement with the hull, resulting in lower accuracy of the measurement data and making it unsuitable for measurement work in rough seas. Summary of the Invention

[0004] In view of this, the present invention provides a ship bottom vertical installation underwater measurement lifting platform, which can reduce the system size while realizing the basic functions of platform lifting, improve the system reliability and ease of operation, and at the same time can lift the equipment into the ship cabin, ensuring the safety of the equipment and facilitating maintenance.

[0005] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0006] A vertically mounted underwater measurement lifting platform on the bottom of a ship includes: a control unit (2), a drive unit, a lifting unit, and a protection unit;

[0007] The control unit (2) is used to adjust the circuit on / off state to control the operation of the drive unit;

[0008] The control unit (2) includes a low-voltage power supply, a main control module, an upward programmable switch K1, a downward programmable switch K2, a stop programmable switch K3, normally closed contacts KM1-2, normally closed contacts KM2-2, normally open contacts KM1-3, normally open contacts KM2-3, coils KM1 and KM2; the upward programmable switch K1 is connected in parallel with normally open contacts KM1-3 and then in series with coils KM1 and normally closed contacts KM2-2 to form an upward branch; the downward programmable switch K2 is connected in parallel with normally open contacts KM2-3 and then in series with coils KM2 and normally closed contacts KM1-2 to form a downward branch; the upward branch and the downward branch are connected in parallel and then in series with stop programmable switch K3 to connect to the low-voltage power supply; the opening and closing of the upward programmable switch K1, the downward programmable switch K2 and the stop programmable switch K3 are controlled by the main control module; the control unit (2) and the drive unit are connected through the electromagnetic action of coils KM1 and KM2;

[0009] The drive unit is connected to the lifting unit to provide power output to the system;

[0010] The lifting unit is used to realize the lifting function of the system;

[0011] The protection unit is used to provide limit protection, temperature protection and / or current protection; the protection unit collects the working status of the drive unit and the lifting unit, and outputs the data to the main control module connected to the control unit.

[0012] Preferably, the lifting unit includes a main frame (1), a three-stage lifting rod (4), a transmission rod (6), a sea valve (7), a transmission connection assembly (8), and a locking switch (9); the main frame (1) defines the shape and base of the lifting platform and is vertically installed on the centerline of the bottom of the hull; the sea valve (7) is installed on the bottom of the hull and the main frame (1) and communicates with the outside of the bottom of the hull; during lifting operations, the locking switch (9) and the sea valve (7) are opened to allow the load to pass through; the three-stage lifting rod (4) and the transmission rod (6) are connected to the main frame (1) and arranged in parallel; the three-stage lifting rod (4) and the transmission rod (6) are connected by the transmission connection assembly (8); the drive unit is connected to the transmission rod (6) to output power; when the lifting rod (4) is retracted into the sea valve (7), the locking switch (9) is closed, and at this time the three-stage lifting rod (4) does not respond to the descent command.

[0013] Preferably, the three-stage lifting rod (4) further includes a first lifting rod (41), a second lifting rod (42), a third lifting rod (43), a first limit switch, and a second limit switch; the bottom of the third lifting rod (43) is connected to the load, and the transmission connection assembly (8) drives the three-stage lifting rod (4) to move vertically; when the first lifting rod (41) descends and triggers the first limit switch, the second lifting rod (42) continues to extend; when the second lifting rod (42) descends and triggers the second limit switch, the third lifting rod (43) continues to extend; the three-stage lifting rod (4) is hollow in structure to allow the instrument data cable to pass through.

[0014] Preferably, the main control module controls the opening and closing of the up control switch K1, the down control switch K2, and the stop control switch K3 according to remotely input instructions.

[0015] Preferably, the control unit (2) further includes an up manual switch SB1, a down manual switch SB2 and a stop manual switch SB3; the up manual switch SB1 and the up programmable switch K1 are connected in parallel, the down manual switch SB2 and the down programmable switch K2 are connected in parallel, and the stop manual switch SB3 is connected in series in the main circuit of the low-voltage power supply.

[0016] Preferably, the drive unit includes a drive motor and a drive device (3); the drive device (3) supplies power to the drive motor, including a high-voltage power supply, normally open contact KM1-1 and normally open contact KM2-1; when normally open contact KM1-1 is closed, the rotation direction of the drive motor is opposite to that when normally open contact KM2-1 is closed; normally open contact KM1-1 and normally open contact KM2-1 are connected in parallel and then connected in series to the drive motor and connected to the high-voltage power supply.

[0017] Preferably, the control unit (2) and the drive unit, wherein coil KM1, normally open contact KM1-1, normally closed contact KM1-2 and normally open contact KM1-3 form a rising contactor; and coil KM2, normally open contact KM2-1, normally closed contact KM2-2 and normally open contact KM2-3 form a falling contactor.

[0018] Preferably, the control unit (2) further includes an encoder, which encodes the operating status of the drive motor and inputs it into the main control module to obtain the position of the load.

[0019] Preferably, the protection unit includes a current protection device and / or a thermal protection device;

[0020] The current protection device includes a current sensor and a short-circuit switch Q1; the current sensor reads the current value of the drive unit and inputs it into the main control module;

[0021] The thermal protection device includes a temperature sensor, a thermal sensor, and an overheat switch Q2; the temperature sensor reads the operating ambient temperature of the system and inputs it into the main control module; the thermal sensor reads the operating temperature of the drive unit and inputs it into the main control module.

[0022] Short-circuit switch Q1 and overheat switch Q2 are connected in series to the main circuit of the low-voltage power supply. When the current value is greater than the current threshold set by the main control module, short-circuit switch Q1 is open, and closed in other states. When the ambient temperature is greater than the first temperature threshold set by the main control module, or when the operating temperature is greater than the second temperature threshold set by the main control module, overheat switch Q2 is open, and closed in other states. The opening and closing of short-circuit switch Q1 and overheat switch Q2 are controlled by the main control module.

[0023] Preferably, the protection unit further includes a limit judgment device; the limit judgment device includes an upper limit sensor (10), a lower limit sensor, an upper limit switch L1, and a lower limit switch L2; the upper limit sensor (10) and the lower limit sensor output to the main control module; the upper limit switch L1 is connected in series to the rising branch, and the lower limit switch L2 is connected in series to the falling branch; the opening and closing of the upper limit switch L1 and the lower limit switch L2 are controlled by the main control module; the upper limit sensor (10) and the lower limit sensor are installed on the main frame (1), corresponding to the upper and lower limit positions of the three-stage lifting rod (4); when the load reaches the upper limit position, the upper limit switch L1 is open, and closed in other states; when the load reaches the lower limit position, the lower limit switch L2 is open, and closed in other states.

[0024] Beneficial effects:

[0025] 1. This invention, through a relatively simple system structure design, especially the structure design of the system's control unit, can reduce the system size while realizing the basic platform lifting function, and at the same time improve the system's reliability and ease of operation. Its design using two sets of DC contactors enables the system to achieve self-locking and interlocking between lifting commands, and with the addition of the main control module, it achieves programmable automatic implementation of the lifting function.

[0026] 2. This invention, through its main control module, can automatically control the rising, falling, and stopping functions by writing code according to the system's lifting requirements. It can also be controlled remotely based on remotely input commands, enabling remote system control. Combined with the manual control switch, the system can achieve three operation modes: remote program control, local manual operation, and automatic program control, while also ensuring the system's safe operation.

[0027] 3. This invention achieves electrical isolation between the low-voltage control unit and the high-voltage drive unit by controlling the high-voltage drive module with a low-voltage module, thereby improving the stability and safety of the system.

[0028] 4. By lifting the equipment into the ship's cabin, this invention ensures the safety of the equipment and facilitates maintenance. At the same time, the design of the connection structure reduces the disturbance of surges during measurement work and improves the accuracy of data acquisition.

[0029] 5. By setting up protection units, this invention provides limit protection, temperature protection and current protection for the system, further improving the safety and reliability of the system.

[0030] 6. By setting the encoder, the main control module can accurately calculate the position of the load in real time. Compared with calculation by program alone, its accuracy is improved, which makes it easier for the system to realize the automatic programmable lifting function.

[0031] 7. This invention increases the lifting stroke by setting up multi-stage lifting rods, reduces the height requirement of the platform, and avoids the problem of installation being impossible due to limitations on the height of the hull. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the lifting platform structure based on an embodiment of the present invention;

[0033] Figure 2 This is a circuit diagram of the lifting platform control unit and drive unit based on an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the three-stage lifting boom retraction state based on an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the extended state of the three-stage lifting rod according to an embodiment of the present invention;

[0036] Among them, 1-main frame, 2-control unit, 3-drive device, 4-three-stage lifting rod, 5-drive motor and encoder, 6-transmission rod, 7-sea valve, 8-transmission connection assembly, 9-locking switch, 10-upper limit sensor, 11-measuring equipment, 12-bottom of the ship, 21-main control module, 22-program automatic control input, 23-manual control input, 24-encoder detection input, 25-remote drive control input, 26-limit judgment input, 27-protection unit input, 41-first stage lifting rod, 42-second stage lifting rod, 43-third stage lifting rod. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] This invention provides a vertically mounted underwater measurement lifting platform on the bottom of a ship, the core of which includes a control unit 2, a drive unit, a lifting unit, and a protection unit.

[0039] Control unit 2 includes a low-voltage power supply, a main control module 21, an ascending programmable switch K1, a descending programmable switch K2, a stop programmable switch K3, normally closed contacts KM1-2, normally closed contacts KM2-2, normally open contacts KM1-3, normally open contacts KM2-3, coils KM1 and KM2. Ascending programmable switch K1 is connected in parallel with normally open contact KM1-3, and then in series with coils KM1 and normally closed contact KM2-2 to form an ascending branch. Descending programmable switch K2 is connected in parallel with normally open contact KM2-3, and then in series with coils KM2 and normally closed contact KM1-2 to form a descending branch. The ascending and descending branches are connected in parallel and then in series with stop programmable switch K3, which is connected to the low-voltage power supply. The opening and closing of ascending programmable switch K1, descending programmable switch K2, and stop programmable switch K3 are controlled by the main control module 21. Control unit 2 and drive unit are connected through the electromagnetic interaction of coils KM1 and KM2.

[0040] Among them, the contactor is a mature technology consisting of a coil and contact points. When the coil is de-energized, the normally closed contacts remain closed and the normally open contacts remain open. When the coil is energized, the normally closed contacts open and the normally open contacts close.

[0041] When the lifting platform performs an upward operation, the upward control switch K1 closes, energizing the coil KM1 of the upward branch. The normally open contact KM1-1 closes, driving the motor and causing the lifting rod to move upward. The normally closed contact KM1-2 opens, breaking the circuit in the downward branch. At this point, even if the downward control switch K2 is closed, the system will not respond, achieving interlocking between the lifting control commands. Simultaneously, the normally open contact KM1-3 closes. Even if the upward control switch K1 is opened, the system will not stop but will continue to perform the upward movement, achieving self-locking of the lifting control commands. Only by opening the stop control switch K3 will the system stop and all switches reset. The same symmetrical principle applies to the downward operation.

[0042] As can be seen, this invention, through a relatively simple system structure design, especially the structure design of the system's control unit, can reduce the system size while realizing the basic platform lifting function, and at the same time improve the system's reliability and ease of operation. The design of two sets of DC contactors enables the system to achieve self-locking and interlocking between lifting commands, and with the assistance of the main control module 21, the programmable automatic implementation of the lifting function is achieved.

[0043] The present invention will be further described in detail below with reference to an embodiment.

[0044] The hull-mounted, vertically mounted underwater measurement lifting platform provided in this embodiment includes subunits: a control unit, a drive unit, a lifting unit, and a protection unit. A structural schematic diagram of the lifting platform control system is shown below. Figure 1 As shown.

[0045] The control unit is used to adjust the circuit's on / off state to control the operation of the drive unit. Its output is connected to the drive unit, specifically as follows:

[0046] Control unit 2 includes a low-voltage power supply, a main control module 21, an ascending programmable switch K1, a descending programmable switch K2, a stop programmable switch K3, normally closed contacts KM1-2, normally closed contacts KM2-2, normally open contacts KM1-3, normally open contacts KM2-3, coils KM1 and KM2. Coil KM1, normally closed contacts KM1-2, and normally open contacts KM1-3 form an ascending contactor, while coil KM2, normally closed contacts KM2-2, and normally open contacts KM2-3 form a descending contactor. The ascending programmable switch K1 is connected in parallel with normally open contacts KM1-3 and then in series with coils KM1 and KM2-2 to form an ascending branch. The descending programmable switch K2 is connected in parallel with normally open contacts KM2-3 and then in series with coils KM2 and KM1-2 to form a descending branch. The ascending and descending branches are connected in parallel and then in series with the stop programmable switch K3, which is connected to the low-voltage power supply. The opening and closing of the ascending programmable switch K1, the descending programmable switch K2, and the stopping programmable switch K3 are controlled by the main control module 21. The control unit 2 uses normally closed and normally open contacts connected in parallel in a cross-connected series circuit to achieve interlocking and self-locking protection of the commands.

[0047] The control unit 2 further includes an ascending manual switch SB1, a descending manual switch SB2, and a stop manual switch SB3. The ascending manual switch SB1 and the ascending programmable switch K1 are connected in parallel, the descending manual switch SB2 and the descending programmable switch K2 are connected in parallel, and the stop manual switch SB3 is connected in series in the main circuit of the low-voltage power supply. The ascending manual switch SB1, the descending manual switch SB2, and the stop manual switch SB3 are manually controlled. Because the ascending programmable switch K1 and the ascending manual switch SB1 are connected in parallel, and the descending programmable switch K2 and the descending manual switch SB2 are also connected in parallel, the automatic control performance of the main control module 21 is equivalent to the manual control function.

[0048] The control unit 2 further includes an encoder, which encodes the operating status of the drive motor and inputs it into the main control module 21 to obtain the real-time position of the load. This facilitates the main control module 21's automatic control of the system. The central processing unit calculates the encoder value in real time to determine the lifting height and automatically stops the machine when the predetermined position is reached. The encoder allows the main control module 21 to accurately calculate the load position in real time, improving accuracy compared to calculations performed solely by a program, thus facilitating the implementation of automatic programmed lifting functions.

[0049] The main control module 21 in control unit 2 can automatically control the opening and closing of the ascending programmable switch K1, descending programmable switch K2, and stop programmable switch K3 according to the system's lifting requirements through code programming. It can also control these three switches based on remotely input commands, achieving remote system control. Furthermore, through manual control of the ascending manual switch SB1, descending manual switch SB2, and stop manual switch SB3, the system can achieve three modes: remote program control, local manual operation, and automatic program control, while also ensuring the system's safe operation. The low-voltage power supply can be a 24V DC regulated power supply or other low-voltage power sources.

[0050] The drive unit, connected to the lifting unit, provides power output to the system. Figure 2 The circuit diagram of the lifting platform control unit and drive unit in this embodiment is as follows:

[0051] The drive unit includes a drive motor, a high-voltage power supply, normally open contacts KM1-1 and KM2-1. The high-voltage power supply, normally open contacts KM1-1, and normally open contacts KM2-1 constitute the drive device 3. Normally open contact KM1-1 is included in the rising contactor, and normally open contact KM2-1 is included in the falling contactor. The main circuit of the drive unit uses two parallel DC contactors to achieve forward or reverse rotation of the motor. When normally open contact KM1-1 is closed, the rotation direction of the drive motor is opposite to that when normally open contact KM2-1 is closed. Normally open contacts KM1-1 and KM2-1 are connected in parallel and then in series, connecting the drive motor to the high-voltage power supply. In this embodiment, a three-phase power supply is used, but other power supply methods can be selected depending on the type of drive motor.

[0052] When the lifting platform performs an upward operation, the manual upward switch SB1 or the programmable upward switch K1 closes, energizing the coil KM1 of the upward branch. This closes the normally open contact KM1-1, driving the motor and causing the lifting rod to move upward. The normally closed contact KM1-2 opens, breaking the circuit in the downward branch. At this point, even if the programmable downward switch K2 or the manual downward switch SB2 is closed, the system will not respond, achieving interlocking between the lifting control commands. Simultaneously, the normally open contact KM1-3 closes. Even if both the programmable upward switch K1 and the manual upward switch SB1 are open, the system will not stop but will continue to perform the upward movement, achieving self-locking of the lifting control commands. Only by opening the programmable stop switch K3 or the manual stop switch SB3 will the system stop and all switches reset. The same symmetrical logic applies to the downward operation.

[0053] When the system needs to be stopped while it is in the lifting or lowering state, disconnect the manual stop switch SB3 or the programmable stop switch K3. The lifting branch circuit will be disconnected and de-energized, and the contacts KM1-1 or KM2-2 will be opened, stopping the motor.

[0054] As can be seen, the system achieves electrical isolation between the low-voltage control unit and the high-voltage drive unit, and the design of controlling the high-voltage drive module by the low-voltage module improves the stability and safety of the system.

[0055] The lifting unit is a mechanical structure that enables the system's lifting function; specifically, it consists of:

[0056] The lifting unit includes a main frame 1, a three-stage lifting boom 4, a transmission rod 6, a sea valve 7, a transmission connection assembly 8, and a locking switch 9. The main frame 1 defines the shape and base of the lifting platform and is vertically installed on the centerline of the hull bottom. The sea valve 7 is installed on the hull bottom and the main frame 1, communicating with the outside world. During lifting operations, the locking switch 9 and the sea valve 7 are opened to allow the load to pass through. The three-stage lifting boom 4 and the transmission rod 6 are connected to the main frame 1 and arranged in parallel. The three-stage lifting boom 4 and the transmission rod 6 are connected by the transmission connection assembly 8. The drive unit is connected to the transmission rod 6 to output power. When the lifting boom 4 is retracted into the sea valve 7, the locking switch 9 is closed. At this time, the three-stage lifting boom 4 does not respond to the descent command.

[0057] like Figure 3 and Figure 4 As shown, the three-stage lifting rod 4 further includes a first lifting rod 41, a second lifting rod 42, a third lifting rod 43, a first limit switch, and a second limit switch; the bottom of the third lifting rod 43 is connected to the load, and the transmission connection assembly 8 drives the three-stage lifting rod 4 to move up and down in the vertical direction. When the first lifting rod 41 descends and triggers the first limit switch, the second lifting rod 42 continues to extend. When the second lifting rod 42 descends and triggers the second limit switch, the third lifting rod 43 continues to extend. The three-stage lifting rod 4 is hollow in structure to allow the instrument data cable to pass through.

[0058] This invention ensures the safety of the equipment by lifting it into the ship's cabin and facilitates maintenance. At the same time, the design of the connection structure reduces the disturbance of surges during measurement work and improves the accuracy of data acquisition. Furthermore, the multi-stage lifting rod increases the lifting stroke, reduces the height requirement of the platform, and avoids the problem of installation being impossible due to the height limitation of the ship.

[0059] The protection unit provides limit protection, temperature protection, and current protection for the system. It collects the operating status of the drive unit and lifting unit, and its output is connected to the main control module 21 of the control unit. The protection unit includes a limit judgment device, a current protection device, and a thermal protection device, specifically:

[0060] The current protection device includes a current sensor and a short-circuit switch Q1; the current sensor reads the current value of the drive unit and inputs it into the main control module 21.

[0061] The thermal protection device includes a temperature and humidity sensor, a thermal sensor, and an overheat switch Q2; the temperature sensor reads the operating ambient temperature of the system and inputs it into the main control module 21, and the thermal sensor reads the operating temperature of the drive unit and inputs it into the main control module 21.

[0062] Short-circuit switch Q1 and overheat switch Q2 are connected in series to the main low-voltage power supply circuit of the control unit and are controlled by the main control module 21. When the current value read by the current sensor is greater than the current threshold set by the main control module 21, short-circuit switch Q1 opens, de-energizing both main control branches and shutting down the motor for protection; in other states, short-circuit switch Q1 closes. When the ambient temperature exceeds a temperature threshold set by the main control module 21, or when the operating temperature of the drive motor exceeds another temperature threshold set by the main control module 21, overheat switch Q2 opens, de-energizing both main control branches and shutting down the motor for protection; in other states, overheat switch Q2 closes.

[0063] The limit switch includes an upper limit sensor 10, a lower limit sensor, an upper limit switch L1, and a lower limit switch L2. The upper and lower limit sensors output information to the main control module 21. The upper limit switch L1 is connected in series to the ascending branch, and the lower limit switch L2 is connected in series to the descending branch. The opening and closing of the upper and lower limit switches L1 and L2 are controlled by the main control module 21. The upper limit sensor 10 is mounted on the main frame 1. When it reads that the load has reached near the top, the main control module 21 disconnects the upper limit switch L1, the drive motor stops working, and the load no longer rises; in other states, the upper limit switch L1 is closed. The lower limit sensor is mounted on the main frame 1. When it reads that the load has reached the bottom, the main control module 21 disconnects the lower limit switch L2, the drive motor stops working, and the load no longer descends; in other states, the lower limit switch L2 is closed.

[0064] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vertically mounted underwater measurement lifting platform on the bottom of a ship, characterized in that, include: Control unit (2), drive unit, lifting unit and protection unit; The control unit (2) is used to adjust the circuit on / off state to control the operation of the drive unit; The control unit (2) includes a low-voltage power supply, a main control module (21), an upward programmable switch K1, a downward programmable switch K2, a stop programmable switch K3, normally closed contacts KM1-2, normally closed contacts KM2-2, normally open contacts KM1-3, normally open contacts KM2-3, coils KM1 and KM2; wherein the opening and closing of each switch is controlled by the main control module (21); the upward programmable switch K1 is connected in parallel with normally open contacts KM1-3 and then in series with coils KM1 and normally closed contacts KM2-2 to form an upward branch; the downward programmable switch K2 is connected in parallel with normally open contacts KM2-3 and then in series with coils KM2 and normally closed contacts KM1-2 to form a downward branch; the upward branch and the downward branch are connected in parallel and then in series with stop programmable switch K3 to connect to the low-voltage power supply; the control unit (2) and the drive unit are connected through the electromagnetic action of coils KM1 and KM2; The drive unit is connected to the lifting unit to provide power output to the system; The lifting unit is used to realize the lifting function of the system; The protection unit is used to provide limit protection, temperature protection and / or current protection; the protection unit collects the working status of the drive unit and the lifting unit, and outputs the main control module (21) connected to the control unit; The lifting unit includes a main frame (1), a three-stage lifting rod (4), a transmission rod (6), a sea valve (7), a transmission connection assembly (8), and a locking switch (9). The main frame (1) defines the shape and base of the lifting platform and is vertically installed on the centerline of the bottom of the hull. The sea valve (7) is installed on the bottom of the hull and the main frame (1) and communicates with the outside world. During lifting operations, the locking switch (9) and the sea valve (7) are opened to allow the load to pass through. The three-stage lifting rod (4) and the transmission rod (6) are connected to the main frame (1) and arranged in parallel. The three-stage lifting rod (4) and the transmission rod (6) are connected by the transmission connection assembly (8). The drive unit is connected to the transmission rod (6) to output power. When the lifting rod (4) is retracted into the sea valve (7), the locking switch (9) is closed. At this time, the three-stage lifting rod (4) does not respond to the descent command.

2. The hull-mounted vertical underwater measurement lifting platform as described in claim 1, characterized in that, The three-stage lifting rod (4) further includes a first lifting rod (41), a second lifting rod (42), a third lifting rod (43), a first limit switch, and a second limit switch; the bottom of the third lifting rod (43) is connected to the load, and the transmission connection assembly (8) drives the three-stage lifting rod (4) to move up and down in the vertical direction. When the first lifting rod (41) descends and triggers the first limit switch, the second lifting rod (42) continues to extend. When the second lifting rod (42) descends and triggers the second limit switch, the third lifting rod (43) continues to extend. The three-stage lifting rod (4) has a hollow structure to allow the instrument data cable to pass through.

3. The hull-mounted vertical underwater measurement lifting platform as described in claim 1, characterized in that, The main control module (21) controls the opening and closing of the rising programmable switch K1, the falling programmable switch K2, and the stopping programmable switch K3 according to the remotely input instructions.

4. The hull-mounted vertical underwater measurement lifting platform as described in claim 1 or 3, characterized in that, The control unit (2) further includes an up manual switch SB1, a down manual switch SB2 and a stop manual switch SB3; the up manual switch SB1 and the up programmable switch K1 are connected in parallel, the down manual switch SB2 and the down programmable switch K2 are connected in parallel, and the stop manual switch SB3 is connected in series in the main circuit of the low-voltage power supply.

5. The hull-mounted vertical underwater measurement lifting platform as described in claim 1, characterized in that, The drive unit includes a drive motor and a drive device (3); the drive device (3) supplies power to the drive motor, including a high-voltage power supply, normally open contact KM1-1 and normally open contact KM2-1; when normally open contact KM1-1 is closed, the rotation direction of the drive motor is opposite to that when normally open contact KM2-1 is closed; normally open contact KM1-1 and normally open contact KM2-1 are connected in parallel and then connected in series to the drive motor and connected to the high-voltage power supply.

6. The hull-mounted vertical underwater measurement lifting platform as described in claim 5, characterized in that, The control unit (2) and the drive unit, wherein coil KM1, normally open contact KM1-1, normally closed contact KM1-2 and normally open contact KM1-3 form a rising contactor; coil KM2, normally open contact KM2-1, normally closed contact KM2-2 and normally open contact KM2-3 form a falling contactor.

7. The hull-mounted vertical underwater measurement lifting platform as described in claim 5, characterized in that, The control unit (2) further includes an encoder, which encodes the working status of the drive motor and inputs it into the main control module (21) to obtain the position of the load.

8. The hull-mounted underwater measurement lifting platform as described in claim 1, characterized in that, The protection unit includes a current protection device and / or a thermal protection device; The current protection device includes a current sensor and a short-circuit switch Q1; the current sensor reads the current value of the drive unit and inputs it into the main control module (21); The thermal protection device includes a temperature sensor, a thermal sensor, and an overheat switch Q2; the temperature sensor reads the operating ambient temperature of the system and inputs it into the main control module (21); the thermal sensor reads the operating temperature of the drive unit and inputs it into the main control module (21); Short-circuit switch Q1 and overheat switch Q2 are connected in series to the main circuit of the low-voltage power supply. When the current value is greater than the current threshold set by the main control module (21), short-circuit switch Q1 is open, and closed in other states. When the ambient temperature is greater than the first temperature threshold set by the main control module (21), or when the operating temperature is greater than the second temperature threshold set by the main control module (21), overheat switch Q2 is open, and closed in other states. The opening and closing of short-circuit switch Q1 and overheat switch Q2 are controlled by the main control module (21).

9. The hull-mounted vertical underwater measurement lifting platform as described in claim 1, characterized in that, The protection unit further includes a limit judgment device; the limit judgment device includes an upper limit sensor (10), a lower limit sensor, an upper limit switch L1, and a lower limit switch L2; the upper limit sensor (10) and the lower limit sensor will output to the main control module (21); the upper limit switch L1 is connected in series to the rising branch, and the lower limit switch L2 is connected in series to the falling branch. The opening and closing of the upper limit switch L1 and the lower limit switch L2 are controlled by the main control module (21); the upper limit sensor (10) and the lower limit sensor are installed on the main frame (1) and correspond to the upper and lower limit positions of the three-stage lifting rod (4). When the load reaches the upper limit position, the upper limit switch L1 is open, and closed in other states; when the load reaches the lower limit position, the lower limit switch L2 is open, and closed in other states.

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