Underwater multi-stage stage lifting mechanism

Abstract

The present application relates to the technical field of lifting mechanism, in particular to a kind of underwater multistage stage lifting mechanism, including base frame, it is fixedly installed on concrete foundation, still include: lifting section assembly, by sequentially active suit lifting section one, lifting section two, lifting section three and lifting section four composition, adjacent lifting section is connected by sprocket assembly transmission to realize synchronous jacking;Suspension point pulley, set on base frame and lifting section one.This application cooperates with centrifugal drive and variable damping hydraulic pressure, completely solves the impact damage of high-speed falling and high-position locking problem;Lifting section falls and drives centrifugal drive component to act, power is transmitted to pressure relief slow descent component, spiral sleeve pushes up and down lower damper disc, hydraulic oil flows through damping groove and generates damping force, up damper disc is guided to rotate by the arc segment of variable position sliding groove, gradually staggered damping groove, reduce effective flow area, so that damping force gradually changes from small to large with the falling process.

Description

Technical Field

[0001] This invention relates to the field of lifting mechanism technology, specifically an underwater multi-stage stage lifting mechanism. Background Technology

[0002] With the booming development of the cultural tourism and performing arts industry, large-scale water theaters and theme parks are placing increasingly higher demands on the mechanical performance of underwater stages. As a core special equipment, underwater multi-stage stage lifting mechanisms need to achieve precise synchronous lifting of multiple stages in deep water or humid environments to meet the needs of complex stage scenery changes. In existing technologies, such lifting mechanisms typically employ a winch-type drive structure, using a motor to drive a winch to wind up cables, and using pulleys and sprockets to drive the multi-stage structure to achieve lifting. While this structure can achieve basic lifting functions, the following technical shortcomings still urgently need to be addressed in practical engineering applications.

[0003] Due to the complex underwater environment and the long-term high-load operation of the equipment, the risk of accidental cable breakage cannot be completely eliminated. Existing technology typically uses centrifugal fall arrestors as a safety protection measure. When a lifting section falls rapidly due to a broken cable, the centrifugal fall arrestor is triggered and forcibly locks the lifting structure onto the guide rail. However, this rigid locking method has serious drawbacks: the instantaneous locking of multiple lifting sections under enormous inertia generates a huge mechanical impact force, which can easily lead to structural deformation of the lifting sections, bending of the guide rail, or damage to the fall arrestor itself. Furthermore, locking the equipment at a high altitude or underwater position not only greatly inconveniences subsequent maintenance and rescue work but may also cause secondary safety accidents. Therefore, there is an urgent need for an underwater multi-stage stage lifting mechanism that combines smooth braking and impact-free reset functions to solve the problems existing in current technology. Summary of the Invention

[0004] The purpose of this invention is to provide an underwater multi-stage stage lifting mechanism to overcome the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an underwater multi-stage stage lifting mechanism, comprising a base frame fixedly installed on a concrete foundation, and further comprising:

[0006] The lifting section assembly consists of lifting section one, lifting section two, lifting section three and lifting section four that are sequentially and movably mounted. Adjacent lifting sections are connected by a sprocket assembly to achieve synchronous lifting.

[0007] The suspension pulley is installed on the base frame and the lifting section. The cable is wound around the suspension pulley in the manner of a movable pulley and is driven by a motor to raise and lower the lifting section assembly.

[0008] Both the centrifugal drive assembly and the pressure relief slumping assembly are mounted on the base frame;

[0009] When the cable breaks, the lifting section falls, causing the centrifugal drive component to move and transmit the rotational power to the pressure relief and slow-descent component. The hydraulic oil flows through the damping orifice, generating a gradually increasing damping force, which enables the lifting section component to decelerate smoothly and return to its initial position, avoiding rigid impact.

[0010] Preferably, the sprocket assembly includes a drive sprocket and a drive chain; the drive sprocket on the first lifting section is movably mounted on its upper side, and the drive chain is meshed and fitted onto the drive sprocket, with one end fixed to the base frame and the other end fixed to the second lifting section; the sprocket assemblies between the remaining lifting sections are connected in this manner.

[0011] Preferably, the centrifugal drive assembly includes a transmission gear, a first transmission disc, centrifugal claws, and a second transmission disc; the transmission gear meshes with a rack on the first lifting section to drive the downward power input; the centrifugal claws expand outward under centrifugal force and engage with the stop block, driving the second transmission disc to rotate.

[0012] Preferably, the pressure relief and slow-down assembly includes a lower sleeve, a transmission screw, a spiral sleeve, an upper damping disc, and a lower damping disc; the transmission screw and the transmission disc are connected by a bevel gear, and the spiral sleeve is spirally connected to the transmission screw, which is used to convert rotational motion into linear motion to push the upper damping disc and the lower damping disc to move downward.

[0013] Preferably, the lower sleeve has a positioning groove on its inner wall, and the lower damping disk has a protrusion on its outer periphery that cooperates with the positioning groove to restrict the axial rotation of the lower damping disk; the upper damping disk is movably fitted above the lower damping disk.

[0014] Preferably, the inner wall of the lower sleeve is further provided with a displacement groove, which includes an upper arc segment and a lower vertical segment; the outer periphery of the upper damping disk is provided with a guide pin that cooperates with the displacement groove, which is used to generate axial rotation by being guided by the arc segment when the upper damping disk moves down.

[0015] Preferably, both the upper and lower damping disks are provided with a plurality of damping grooves; in the initial state, the positions of the damping grooves of the two are corresponding to form a large flow channel, and when they are moved to the lower end of the arc segment, the damping grooves of the two are misaligned to form a small flow damping orifice.

[0016] Preferably, the lower sleeve is filled with hydraulic oil to generate viscous damping when the upper and lower damping discs are driven to move downward.

[0017] Preferably, when the lifting section assembly is in a stationary or uniform lifting state, the centrifugal claw of the centrifugal drive assembly separates from the stop block, and the pressure relief and slow descent assembly does not generate braking force.

[0018] Preferably, it also includes guide rail wheels, which are respectively disposed on the base frame and the sides of each lifting section to limit the horizontal position of the lifting section assembly.

[0019] In the above technical solution, the beneficial effects of the present invention are as follows: through the coordinated operation of centrifugal drive and variable damping hydraulics, the problems of impact damage and high-position locking under high-speed fall are completely solved; when the lifting section falls, it drives the centrifugal drive component to move, and transmits power to the pressure relief and slow-descent component. The spiral sleeve pushes the upper and lower damping discs to move down, and the hydraulic oil flows through the damping groove to generate damping force. The upper damping disc is guided to rotate by the arc segment of the displacement slide, gradually misaligning the damping groove and reducing the effective flow area, so that the damping force gradually changes from small to large during the fall, realizing soft braking; at the end of the braking, the upper damping disc moves to the vertical section of the displacement slide, and the damping groove is completely misaligned to form the minimum damping hole, so that the lifting section can fall back to the initial position at a lower speed, which not only eliminates the risk of high-altitude stagnation, but also provides convenience for subsequent maintenance.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0021] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

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

[0024] Figure 2 This is a schematic diagram of the overall structure of the lifting section of the present invention;

[0025] Figure 3 This is a schematic diagram of the lifting joint assembly of the present invention after it has been raised;

[0026] Figure 4 This is a schematic diagram showing the installation positions of the centrifugal drive assembly and the pressure relief and descent assembly of the present invention.

[0027] Figure 5 This is a schematic diagram of the cross-sectional structure of the centrifugal drive assembly of the present invention;

[0028] Figure 6 This is a schematic diagram of a partial explosion of the centrifugal drive component of the present invention;

[0029] Figure 7 This is a schematic diagram of the cross-sectional structure of the pressure relief and slow-down component of the present invention;

[0030] Figure 8 This invention is illustrated by a schematic diagram of the structure of the spiral sleeve and the positioning bracket.

[0031] Figure 9 This invention is presented in a schematic diagram showing the structure of the upper damping disc, the lower damping disc, and the lower sleeve in conjunction.

[0032] Figure 10 This is a schematic diagram illustrating the structure of the damping grooves in the upper and lower damping discs, which is a key feature of this invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] In the diagram: 1. Basic frame; 2. Lifting section assembly; 21. Lifting section one; 22. Lifting section two; 23. Lifting section three; 24. Lifting section four; 3. Sprocket assembly; 31. Transmission sprocket; 32. Transmission chain; 4. Lifting point pulley; 5. Guide column track wheel; 6. Centrifugal drive assembly; 61. Mounting sleeve; 62. Transmission disc one; 63. Centrifugal chuck; 64. Transmission gear; 65. Transmission disc two; 66. Stop block; 7. Pressure relief and slow descent assembly; 71. Lower sleeve; 72. Upper sleeve; 73. Transmission screw; 74. Spiral sleeve; 75. Positioning bracket; 76. Upper damping disc; 77. Lower damping disc; 78. Positioning groove; 79. Displacement groove; 710. Damping groove. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0036] Please see Figure 1-10 This invention provides a technical solution: an underwater multi-stage stage lifting mechanism, including a base frame 1, which is fixedly installed on a concrete foundation, and further including:

[0037] The lifting section assembly 2 consists of lifting section one 21, lifting section two 22, lifting section three 23 and lifting section four 24 that are sequentially and movably assembled. Adjacent lifting sections are connected by a sprocket assembly 3 to achieve synchronous lifting.

[0038] The suspension pulley 4 is set on the base frame 1 and the lifting section 21. The cable is wound around the suspension pulley 4 in the manner of a movable pulley and is driven by a motor to raise and lower the lifting section assembly 2.

[0039] Both the centrifugal drive assembly 6 and the pressure relief and slow-down assembly 7 are mounted on the base frame 1;

[0040] When the cable breaks, the lifting section 21 falls, causing the centrifugal drive component 6 to move and transmit the rotational power to the pressure relief and slow-descent component 7. The hydraulic oil flows through the damping hole and generates a gradually increasing damping force, so that the lifting section component 2 can decelerate smoothly and fall back to the initial position, avoiding rigid impact.

[0041] Specifically, the cable on the lifting pulley 4 is driven by a power component in the prior art; the power component includes a guide wheel for changing the direction of the cable's movement; a winch for winding and releasing the cable; and a motor for driving the winch to rotate. During the lifting process: the motor rotates forward, driving the winch to rotate, and the winch winds up the cable, pulling the lower lifting pulley 4 and lifting section 21 upwards synchronously; the transmission sprocket 31 on lifting section 21 rotates as the section rises, driving lifting section 22 upwards synchronously via the transmission chain 32. Similarly, lifting section 22 drives lifting section 33 via the sprocket assembly 3, ultimately driving lifting section 4 24 to achieve four-stage synchronous lifting. During the descent and reset process: the motor reverses, driving the winch to rotate, and the winch releases the cable. Lifting section assembly 2 descends slowly under its own weight, and the sprocket assembly 3 rotates in the opposite direction to ensure the synchronicity of each stage of descent. During the rope breakage descent process: when the cable breaks and lifting section assembly 2 loses tension and falls under its own weight, lifting section 21 falls, and its side rack drives the centrifugal drive assembly. Component 6 activates and transmits power to the pressure relief and descent assembly 7. The spiral sleeve 74 is driven to move the upper damping disc 76 and lower damping disc 77 downwards synchronously. Initially, the upper damping disc 76 and the upper damping groove 710 of the lower damping disc 77 are aligned, forming a high-flow-rate channel where hydraulic oil can flow rapidly. At this time, the damping force is relatively small. During the gradual downward movement, the upper damping disc 76 is guided by the arc segment of the displacement groove 79 and gradually rotates, causing the upper damping disc 76 and the upper damping groove of the lower damping disc 77 to align. 710 forms a misalignment, causing the effective flow area to gradually decrease and the hydraulic oil flow resistance to continuously increase, generating a gradually increasing damping force, thereby gradually reducing the descent speed of the lifting joint assembly 2; when the upper damping disc 76 moves to the vertical section of the displacement slide 79, the damping groove 710 is completely misaligned, at which point only the minimum damping hole is retained, and the lifting joint assembly 2 safely descends and resets at a lower speed; after the lifting joint assembly 2 falls back to the initial position, the pressure relief and slow descent assembly 7 and the centrifugal drive assembly 6 reset.

[0042] Compared with existing technologies, this invention completely solves the problems of impact damage and high-position locking during high-speed falls by coordinating centrifugal drive and variable damping hydraulics. The falling of the lifting section 21 drives the centrifugal drive component 6 to move, transmitting power to the pressure relief and slow-descent component 7. The spiral sleeve 74 pushes the upper damping plate 76 and the lower damping plate 77 downward. The hydraulic oil flows through the damping groove 710 to generate damping force. The upper damping plate 76 is guided to rotate by the arc segment of the displacement slide 79, gradually misaligning the damping groove 710 and reducing the effective flow area. This causes the damping force to gradually change from small to large during the fall, achieving soft braking. At the end of the braking process, the upper damping plate 76 moves to the vertical section of the displacement slide 79, and the damping groove 710 is completely misaligned to form the minimum damping hole. This allows the lifting section to fall back to the initial position at a lower speed, eliminating the risk of being stuck at high altitude and providing convenience for subsequent maintenance.

[0043] As a preferred technical solution in this embodiment, the sprocket assembly 3 includes a drive sprocket 31 and a drive chain 32; the drive sprocket 31 on the lifting section 1 21 is movably mounted on its upper side, and the drive chain 32 is meshed and fitted onto the drive sprocket 31, with one end fixed to the base frame 1 and the other end fixed to the lifting section 22; the sprocket assemblies 3 between the remaining lifting sections are connected in this manner. Specifically, several sprocket assemblies 3 adopt a segmented synchronous transmission design. Taking a four-stage lifting section as an example: sprocket assemblies 3 are provided on lifting section 1 21, lifting section 22, and lifting section 3 23. To achieve the stability of power transmission, sprocket assemblies 3 are provided at the four corners of multiple lifting sections; the lifting section A transmission sprocket 31 is rotatably mounted on the upper side of lifting section 21 via a bearing seat. The upper end of the transmission chain 32 is rigidly connected to the foundation frame 1 via an anchor, and the lower end is rigidly connected to lifting section 22 via an anchor. The sprocket assemblies 3 on lifting section 22 and lifting section 33 are connected to the adjacent lifting sections in the same way. When lifting section 21 is driven to move upward, the transmission sprocket 31 rotates accordingly, pulling lifting section 22 to rise synchronously via the transmission chain 32. Similarly, the transmission sprocket 31 on lifting section 22 drives lifting section 33 via the transmission chain 32, and the transmission sprocket 31 on lifting section 33 drives lifting section 424, realizing the synchronous lifting of the multi-stage structure.

[0044] As a preferred technical solution in this embodiment, the centrifugal drive assembly 6 includes a transmission gear 64, a first transmission disc 62, a centrifugal chuck 63, and a second transmission disc 65. The transmission gear 64 meshes with a rack on the first lifting section 21 to drive the downward power input. The centrifugal chuck 63 expands outward under centrifugal force and engages with the stop block 66, driving the second transmission disc 65 to rotate. Specifically, the centrifugal drive assembly 6 is integrated and disposed above one corner of the base frame 1. The transmission gear 64 is rotatably mounted on the end of the mounting sleeve 61 via a rotating shaft and is constantly meshed with a vertical rack preset on the side of the first lifting section 21. 1. Fixedly installed on the base frame 1; the transmission disc 62 is synchronously fixedly connected to the transmission gear 64, and at least two sets of centrifugal claws 63 are circumferentially hinged on its disc surface. The tail of the centrifugal claws 63 is pre-tightened by a tension spring. Under normal conditions, the centrifugal claws 63 are retracted and do not contact the stop block 66. When the falling speed of the lifting section 21 exceeds the threshold due to the broken rope, the speed of the transmission gear 64 increases sharply. The centrifugal force overcomes the tension of the tension spring and causes the centrifugal claws 63 to expand outward. The end of the claws is engaged with one side of the fixed stop block 66, thereby driving the transmission disc 65 and the subsequent transmission shaft to rotate synchronously, converting the linear motion of the fall into rotational power output.

[0045] As a preferred technical solution in this embodiment, the pressure relief and slow-descent assembly 7 includes a lower sleeve 71, a transmission screw 73, a spiral sleeve 74, an upper damping disc 76, and a lower damping disc 77. The transmission screw 73 is connected to the transmission disc 65 via a bevel gear transmission, and the spiral sleeve 74 is spirally connected to the transmission screw 73, used to convert rotational motion into linear motion to push the upper damping disc 76 and the lower damping disc 77 downward. Specifically, the pressure relief and slow-descent assembly 7 adopts a spiral hydraulic composite braking structure. The pressure relief and slow-descent assembly 7 also includes an upper sleeve 72, which is fixedly installed at the top of the lower sleeve 71, and both are fixedly installed on the base frame 1. The transmission screw 73 is vertically arranged and rotatably installed inside the upper sleeve 72, and its top end is perpendicularly meshed with the output shaft of the transmission disc 65 via a bevel gear pair. The spiral sleeve 74 is spirally fitted onto the transmission screw 73, and the two constitute a spiral... The rotary transmission pair does not have a self-locking effect; the pressure relief and slow-descent assembly 7 also includes a positioning bracket 75, which is fixedly installed between the lower sleeve 71 and the upper sleeve 72. The spiral sleeve 74 is movably fitted on the positioning bracket 75, and the spiral sleeve 74 and the positioning bracket 75 are slidably connected by a keyway to restrict the rotation of the positioning bracket 75, so that when the spiral sleeve 74 is driven by the transmission screw 73, it can only move up and down axially, thereby pushing the upper damping disk 76 and the lower damping disk 77, which are coaxially arranged below, to move down together, squeezing the hydraulic oil in the lower sleeve 71 to generate damping force; the upper damping disk 76 is rotatably installed at the bottom end of the spiral sleeve 74 to ensure that the upper damping disk 76 can move with the spiral sleeve 74 and can rotate; a return spring is fitted on the outside of the spiral sleeve 74 to drive the spiral sleeve 74, the upper damping disk 76, and the lower damping disk 77 to return to their original positions.

[0046] As a preferred technical solution in this embodiment, the inner wall of the lower sleeve 71 is provided with a positioning groove 78, and the outer periphery of the lower damping disk 77 is provided with a protrusion that cooperates with the positioning groove 78 to restrict the axial rotation of the lower damping disk 77; the upper damping disk 76 is movably fitted above the lower damping disk 77. Specifically, the lower sleeve 71, as the main body for generating damping force, has at least one positioning groove 78 axially opened on its inner wall, and the outer periphery of the lower damping disk 77 is machined with a guide protrusion that intermittently cooperates with the positioning groove 78 to ensure that the lower damping disk 77 can only move linearly along the axis of the lower sleeve 71 and cannot rotate axially; the upper damping disk 76 is movably fitted on the shaft diameter of the lower damping disk 77 through the central hole, and the two can rotate relative to each other, providing a structural basis for subsequent damping hole misalignment adjustment.

[0047] As a preferred technical solution in this embodiment, the inner wall of the lower sleeve 71 is also provided with a displacement groove 79, which includes an upper arc segment and a lower vertical segment; the outer periphery of the upper damping disk 76 is provided with a guide pin that cooperates with the displacement groove 79, which is used to generate axial rotation under the guidance of the arc segment when the upper damping disk 76 moves down. Specifically, the displacement groove 79 is opened on the inner wall of the lower sleeve 71, and its trajectory is formed by two ends; the upper end is an arc segment that deflects axially, and the deflection angle is preferably 30°-60°; the lower end is a vertical segment parallel to the axis; a radially extending guide pin is fixed on the outer periphery of the upper damping disk 76, and the pin is embedded in the displacement groove 79; when the spiral sleeve 74 pushes down, the guide pin slides along the arc segment, forcing the upper damping disk 76 to rotate axially synchronously during the downward movement. When the upper damping disk 76 enters the vertical segment, its circumferential position is locked, and it can only move down in a straight line.

[0048] As a preferred technical solution in this embodiment, both the upper damping disk 76 and the lower damping disk 77 are provided with a plurality of damping grooves 710. In the initial state, the positions of the damping grooves 710 of the two are corresponding to form a large flow channel. When the lower end of the arc segment is moved down, the damping grooves 710 of the two are misaligned to form a small flow damping orifice. Specifically, the surfaces of the upper damping disk 76 and the lower damping disk 77 are provided with a plurality of sets of damping grooves 710 evenly in the radial direction, such as fan-shaped grooves, and semi-circular holes are provided at both ends of the grooves. In the initial state, the damping grooves 710 of the two discs are completely aligned, forming a large cross-section flow channel, allowing hydraulic oil to flow back quickly. As the upper damping disc 76 rotates under the guidance of the displacement slide 79, the damping grooves 710 of the two discs gradually shift, and the effective flow area continues to decrease. When it moves to the end of the arc segment, the damping grooves 710 are completely offset. At this time, the semi-circular holes at the ends of the damping grooves 710 of the two discs are aligned to form a damping hole with a small flow rate, realizing the gradual change of throttling damping from small to large.

[0049] As a preferred technical solution in this embodiment, the lower sleeve 71 is filled with hydraulic oil to generate viscous damping when the upper damping disc 76 and the lower damping disc 77 are driven to move downward. Specifically, the sealed cavity formed by the lower sleeve 71 and the upper sleeve 72 is filled with high-viscosity hydraulic oil, and the filling amount is controlled at 85%-95% of the cavity volume, with a buffer air chamber reserved. When the upper damping disc 76 and the lower damping disc 77 move downward, the hydraulic oil is forced to flow from the narrow flow channel formed by the damping groove 710, using the viscous friction and throttling effect of the fluid to consume the downward kinetic energy, generate a stable braking force, and avoid rigid impact.

[0050] As a preferred technical solution in this embodiment, when the lifting section assembly 2 is in a stationary or uniform lifting state, the centrifugal claw 63 of the centrifugal drive assembly 6 separates from the stop block 66, and the pressure relief and slow descent assembly 7 does not generate braking force. Specifically, under normal operating conditions, the lifting speed of the lifting section 21 is within the design range, and the centrifugal force on the centrifugal claw 63 is insufficient to overcome the tension spring preload, so it always remains separated from the stop block 66. At this time, the pressure relief and slow descent assembly 7 is in a non-working state, and there is no power transmission between the moving parts, avoiding ineffective energy consumption and malfunctions, and ensuring that the lifting process is efficient and smooth.

[0051] As a preferred technical solution of this embodiment, it also includes guide column track wheels 5, which are respectively disposed on the sides of the base frame 1 and each lifting section, and are used to limit the horizontal position of the lifting section assembly 2. Specifically, the guide column track wheels 5 are installed in pairs on the upper inner side of the base frame 1, the upper inner side of each lifting section, and the lower outer side; used to constrain the horizontal sway of each lifting section, while allowing it to slide freely in the vertical direction, ensuring the coaxiality and stability of the multi-stage extension process, and preventing jamming.

[0052] All electrical components involved in this application are existing technologies. Those skilled in the art can select appropriate models of electrical components according to their needs. No restrictions or elaborations are made here. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies can be connected by wires. And according to the actual situation, appropriate controllers can be selected to meet control requirements.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An underwater multi-stage stage lifting mechanism, comprising a base frame (1) fixedly installed on a concrete foundation, characterized in that, Also includes: The lifting section assembly (2) consists of lifting section one (21), lifting section two (22), lifting section three (23) and lifting section four (24) that are sequentially and movably assembled. Adjacent lifting sections are connected by a sprocket assembly (3) to achieve synchronous lifting. The lifting point pulley (4) is set on the base frame (1) and the lifting section (21). The cable is wound around the lifting point pulley (4) in the form of a movable pulley and is driven by the motor to lift and lower the lifting section assembly (2). The centrifugal drive assembly (6) and the pressure relief and slow-descent assembly (7) are both mounted on the base frame (1); When the cable breaks, the lifting section 1 (21) falls down, causing the centrifugal drive assembly (6) to move and transmit the rotational power to the pressure relief and slow descent assembly (7). Through the throttling effect of the hydraulic oil flowing through the damping hole, a gradually increasing damping force is generated, so that the lifting section assembly (2) can decelerate smoothly and fall back to the initial position, avoiding rigid impact. The centrifugal drive assembly (6) includes a transmission gear (64), a transmission disk one (62), a centrifugal claw (63), and a transmission disk two (65); the transmission gear (64) meshes with the rack on the lifting section one (21) to drive the downward power input; the centrifugal claw (63) is subjected to centrifugal force to expand outward and engage with the stop block (66), driving the transmission disk two (65) to rotate; The pressure relief and slow-down assembly (7) includes a lower sleeve (71), a transmission screw (73), a spiral sleeve (74), an upper damping disc (76), and a lower damping disc (77); the transmission screw (73) and the second transmission disc (65) are connected by a bevel gear, and the spiral sleeve (74) is connected to the transmission screw (73) by a spiral, which is used to convert the rotational motion into linear motion to push the upper damping disc (76) and the lower damping disc (77) to move downward; The lower sleeve (71) has a positioning groove (78) on its inner wall, and the lower damping disk (77) has a protrusion on its outer periphery that cooperates with the positioning groove (78) to restrict the axial rotation of the lower damping disk (77); the upper damping disk (76) is movably fitted above the lower damping disk (77); the lower sleeve (71) also has a displacement groove (79) on its inner wall, which includes an upper arc segment and a lower vertical segment; the upper damping disk (76) has a guide pin on its outer periphery that cooperates with the displacement groove (79) to generate axial rotation when the upper damping disk (76) moves down, guided by the arc segment; Both the upper damping disk (76) and the lower damping disk (77) are provided with a number of damping grooves (710); in the initial state, the positions of the damping grooves (710) of the two are corresponding to form a large flow channel, and when they are moved to the lower end of the arc segment, the damping grooves (710) of the two are misaligned to form a small flow damping hole.

2. The underwater multi-stage stage lifting mechanism according to claim 1, characterized in that, The sprocket assembly (3) includes a drive sprocket (31) and a drive chain (32); the drive sprocket (31) on the first lifting section (21) is movably mounted on its side above, and the drive chain (32) is meshed and fitted on the drive sprocket (31), with one end fixed to the base frame (1) and the other end fixed to the second lifting section (22); the sprocket assemblies (3) between the remaining lifting sections are connected in this manner.

3. The underwater multi-stage stage lifting mechanism according to claim 1, characterized in that, The lower sleeve (71) is filled with hydraulic oil to generate viscous damping when the upper damping disc (76) and the lower damping disc (77) are driven to move downward.

4. The underwater multi-stage stage lifting mechanism according to claim 3, characterized in that, When the lifting section assembly (2) is in a stationary or uniform lifting state, the centrifugal claw (63) of the centrifugal drive assembly (6) separates from the stop block (66), and the pressure relief and slow descent assembly (7) does not generate braking force.

5. The underwater multi-stage stage lifting mechanism according to claim 1, characterized in that, It also includes guide rail wheels (5), which are respectively set on the base frame (1) and the sides of each lifting section to limit the horizontal position of the lifting section assembly (2).

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