Ship lift accident safety mechanism thread pair gap detection device and method

Abstract

A device and method for detecting the threaded pair clearance of a ship lift's accident safety mechanism mainly includes a laser clearance detection component and a through-hole slip ring component. The laser clearance detection component includes a clamp mounted on a spherical hinge. A helical support surface is mounted on the upper end of the clamp, and multiple laser sensors are mounted on the helical support surface. These laser sensors are helically distributed and have the same helix angle as the safety screw. The multiple laser sensors emit laser light radially along the spherical hinge, with the laser light perpendicularly directed towards the nut post 1. The through-hole slip ring component includes a stator and a rotor. The lower end of the stator is mounted on an upper guide frame, and the rotor is mounted on the spherical hinge. A conductive ring is embedded within the rotor, and a brush is embedded within the stator, with the conductive ring in contact with the brush. The through-hole slip ring component powers the laser sensors and transmits the data detected by the laser sensors to a PLC controller. This invention provides a device and method for detecting the threaded pair clearance of a ship lift's accident safety mechanism, enabling real-time detection of the threaded pair clearance.

Description

Technical Field

[0001] This invention relates to a threaded pair clearance detection device, and more particularly to a threaded pair clearance detection device and method for a ship lift accident safety mechanism. Background Technology

[0002] The emergency safety mechanism is a crucial component of a fully balanced vertical ship lift, playing a vital role in ensuring safety. During the lifting and lowering of the ship compartment, the rotating screw rises and falls synchronously with the pinion of the drive mechanism. The screw threads and the threaded surfaces of the nut do not contact each other. During installation, there is a certain clearance between the two in both the upper and lower directions, referred to as the emergency safety mechanism threaded pair clearance, which protects the stable operation of the ship lift.

[0003] The emergency safety mechanism of a fully balanced vertical ship lift plays a crucial role, and its importance cannot be overlooked. In the face of emergencies such as loss of water in the ship's compartment, flooding, sinking, or overloading, the emergency safety mechanism can respond rapidly. These sudden situations disrupt the balance of the ship's compartment, causing the clearance between the threaded pairs in the emergency safety mechanism to gradually decrease until it disappears completely. The emergency safety mechanism can withstand the unbalanced load of the ship's compartment and transfer it to the concrete structure of the tower column through the screw and nut, effectively preventing the ship's compartment from tilting or sinking further, thus ensuring the safety of the ship and its passengers. Furthermore, the emergency safety mechanism also plays an indispensable role in maintenance work. When the ship's compartment needs to be emptied for maintenance, the emergency safety mechanism can act as a locking support for the compartment, ensuring its stability during maintenance.

[0004] However, during the lifting and lowering of the ship's cabin, abnormal situations may occur, such as the influence of various factors such as travel deviation. This may cause the clearance of the threaded pair of the emergency safety mechanism to decrease until the clearance disappears, which may cause the emergency safety mechanism to jam. The transmission mechanism will rotate under the action of external load, and the torque transmitted by the safety clutch will increase sharply, causing a major equipment failure of the ship lift.

[0005] In conclusion, the detection of clearance in the threaded joints of the accident safety mechanism is of paramount importance. Real-time detection of this clearance allows for timely detection and automatic shutdown of the ship lift operation, preventing major accidents and ensuring the safe and stable operation of the ship lift. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a device and method for detecting the clearance of threaded pairs in the accident safety mechanism of a ship lift, which can realize the real-time detection of the clearance of threaded pairs. The detection method needs to have good field adaptability and high-precision detection capability to ensure that the ship lift equipment can maintain safe and stable operation under any working conditions.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A threaded pair clearance detection device for a ship lift accident safety mechanism includes a laser clearance detection component and a through-hole slip ring component;

[0009] The laser gap detection assembly includes a clamp, which is mounted on a spherical hinge. A helical support surface is mounted on the upper end of the clamp, and multiple laser sensors are mounted on the helical support surface. The multiple laser sensors are helically distributed and have the same thread helix angle as the safety screw. The multiple laser sensors emit lasers along the radial direction of the spherical hinge, and the lasers are directed perpendicularly towards the nut column 1.

[0010] The through-hole slip ring assembly includes a stator and a rotor;

[0011] The lower end of the stator is mounted on the upper guide frame, and the rotor is mounted on the spherical hinge. The rotor has an embedded conductive ring, and the stator has an embedded brush. The conductive ring and the brush are in contact.

[0012] The through-hole slip ring assembly is used to power the laser sensor; at the same time, the through-hole slip ring assembly transmits the data detected by the laser sensor to the PLC controller.

[0013] The number of laser sensors is A, A≤a, a=360°÷c°, where c is the angle between the edge of each tile and the center line in the nut column; A laser sensors 12 are evenly distributed on the support surface of the bracket at an angle of interval ղ=360°÷A.

[0014] The helix angle of the spiral support surface is the same as the thread helix angle of the safety screw, and the spiral support surface and the clamp are supported by multiple support rods.

[0015] The laser emitted by the laser sensor is perpendicular to the midpoint of the lower thread surface of the nut post.

[0016] The through-hole slip ring assembly is assembled from two halves, left and right.

[0017] The lower end of the through-hole slip ring assembly is fixed to the upper guide frame by an anti-rotation plate and a fixing fork.

[0018] A method for detecting the clearance of threaded joints in a ship lift accident safety mechanism includes the following steps:

[0019] Step 1: The through-hole slip ring assembly is installed in half on the upper guide frame and fitted onto the spherical hinge; above the through-hole slip ring assembly, a clamp is installed, which is also fitted onto the spherical hinge and maintains a certain distance from the through-hole slip ring assembly; a laser sensor is installed on the spiral bracket support surface at the upper end of the clamp.

[0020] Step 2: During operation, the spherical hinge will drive the rotor of the through-hole slip ring assembly and the laser gap detection assembly to rotate together; during operation, it is necessary to ensure that the laser gap detection assembly and the through-hole slip ring assembly do not come into contact with the threads of the nut column;

[0021] Step 3: During the lifting process, the safety screw rotates synchronously inside the nut column. The initial measurement data of the distance between the laser sensor and the lower thread surface of the nut column is recorded as L. 初 The value in real-time detection is N. 测 When |N 测 -L 初 If the clearance between the safety screw and the nut threaded joint changes, it will operate normally; when the clearance changes, it will cause N 测 -L 初 If the clearance is greater than 2mm, the machine will stop and display a "thread pair clearance variation limit fault" message. At this time, the clearance of the safety mechanism's thread pair increases, and the safety screw shifts downwards. When the clearance between the safety screw and the nut thread pair changes, causing N... 测 -L 初 If the clearance is less than -2mm, the machine will stop and display the message "Thread pair clearance variation limit fault". At this time, the clearance of the safety mechanism thread pair becomes smaller and the safety screw deflects upward.

[0022] This invention provides a device and method for detecting the clearance of threaded pairs in a ship lift accident safety mechanism, which has the following technical advantages:

[0023] 1) By deploying multiple laser sensors and cleverly utilizing their installation positions to simulate the threads of a rotating screw, the distance between the device and the nut is detected in real time, thereby enabling the monitoring of the threaded pair clearance data. When abnormal data is detected, the system automatically stops, avoiding accidents caused by the disappearance of the threaded pair clearance in the ship lift and improving overall operational safety.

[0024] 2) Because this device monitors in real time, it can detect signs of equipment failure in advance, take timely maintenance measures, and prevent the failure from developing into more serious damage, thereby reducing maintenance costs and downtime.

[0025] 3) Laser sensors are characterized by high precision and fast response, and can reflect the actual changes in the clearance of threaded pairs in real time, improving detection efficiency and accuracy, and providing reliable data support for equipment maintenance.

[0026] 4) Through the ingenious design of the spiral support surface, the spiral helix angle of the spiral support surface is the same as that of the safety screw, ensuring that the laser gap detection component can maintain relative operation with the nut column during rotation. The detection device is connected to the machine accident safety mechanism. Once the accident safety mechanism suddenly moves up and down, the change in detection data can reflect the change in the threaded pair gap of the accident safety mechanism.

[0027] 5) By configuring the through-hole slip ring assembly, which is specifically designed to provide a stable power supply and signal transmission channel for the laser gap detection assembly, the problem of wire winding caused by rotation is effectively solved.

[0028] 6) Patent application number "202310112392.X" entitled "A Clearance Detection Device and Method for a Ship Lift Safety Mechanism" also applies to the detection of threaded pair clearance. This device uses a sliding contact assembly for power extraction. Compared to the through-hole slip ring method, the copper conductor of the sliding contact assembly is easily oxidized or accumulates dirt due to long-term exposure to the external environment. Especially in harsh environments, it may also corrode, requiring regular maintenance. Otherwise, these problems will lead to unstable power extraction, signal transmission loss, and increased maintenance costs. In contrast, the through-hole slip ring places the brush and copper conductor inside the slip ring, isolating it from the external environment and greatly extending its service life. Through-hole slip rings have wear and corrosion resistance, maintaining stable performance in various harsh environments and requiring almost no maintenance during use, effectively reducing maintenance costs. Through-hole slip rings can transmit precise signals with low electrical noise, thus exhibiting stronger reliability and accuracy in signal transmission. Furthermore, the through-hole slip ring can continuously supply power during high-speed equipment rotation, improving power supply stability and solving problems such as wiring and winding in rotating equipment, thus ensuring normal equipment operation. From a detection principle perspective, the current device uses a proximity switch, which cannot achieve real-time monitoring of the threaded pair clearance. The system only stops and alarms when the threaded pair clearance narrows to the point of contact with the proximity switch. This patent, however, uses a combination of a spiral bracket and a laser rangefinder, enabling real-time monitoring of the threaded pair clearance and significantly improving the ability to predict clearance change trends. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0032] Figure 3 This is a schematic diagram of the laser gap detection component in this invention.

[0033] Figure 4 This is a schematic diagram of the through-hole slip ring assembly in this invention.

[0034] Figure 5 This is a front view of the through-hole slip ring assembly in this invention.

[0035] Figure 6 The diagram shows the distribution of the laser sensors in this invention (in the diagram: pitch is L, ①, ②, and ③ represent different laser sensors).

[0036] Figure 7 This is a top view of the overall structure of the present invention.

[0037] Figure 8 This is a cross-sectional view of the connection between the through-hole electric slip ring assembly and the spherical hinge in this invention.

[0038] Figure 9 This is a diagram showing the state of the threaded pair clearance detection of the present invention (in the diagram: a represents the upper limit laser emission point, b represents the normal laser emission point, and c represents the lower limit laser emission point).

[0039] In the diagram: 1. Nut column; 2. Upper guide frame; 3. Safety screw; 4. Lower guide frame; 5. Spherical hinge; 6. Laser gap detection assembly; 7. Through-hole slip ring assembly; 11. Helical support surface; 12. Laser sensor; 13. Support rod; 14. Clamp; 21. Stator; 22. Rotor; 23. Stator wire; 24. Rotor wire; 25. Anti-rotation plate; 26. Fixing fork; 27. First screw; 28. Second screw; 29. ​​Second screw fixing hole; 30. Vertical tangent; 41. Nut thread coverage area; 42. Groove. Detailed Implementation

[0040] A device for detecting the clearance of the threaded pair of a ship lift accident safety mechanism is used to detect the clearance of the threaded pair of the ship lift accident safety mechanism, which is the clearance between the upper and lower parts of the safety screw 3 and the nut 1.

[0041] like Figure 7 As shown, the nut column 1 in the accident safety mechanism of the ship lift is installed on the concrete wall of the tower column groove. Each nut column 1 consists of two tile structures, each tile structure has a thread in the range of c°, and a slot is opened between the two tiles to accommodate the cantilever structure of the ship compartment. Each slot has a gap of λ=180-c°.

[0042] The safety screw 3 is installed between the upper guide frame 2 and the lower guide frame 4. The spherical hinge 5 is located at the upper end of the upper guide frame 2 and is used to fix the safety screw 3. When the power drives the spherical hinge 5 to rotate, it drives the safety screw 3 to rotate together. The spherical hinge 5 and the safety screw 3 make a spiral free-spinning motion relative to the nut column 1. The upper guide frame 2 and the lower guide frame 4 do not make a rotational motion and can slide along the upper and lower direction of the outer wall of the nut column 1.

[0043] like Figure 1-2As shown, a threaded joint clearance detection device for a ship lift emergency safety mechanism includes a laser clearance detection component 6 and a through-hole slip ring component 7. The laser clearance detection component 6 is fixed on a spherical hinge 5, spaced 100mm from the through-hole slip ring component 7. The through-hole slip ring component 7 is mounted on an upper guide frame 2, with its rotor 22 centered on the spherical hinge 5. When the spherical hinge 5 rotates, it drives the rotor 22 of the through-hole slip ring component 7 and the laser clearance detection component 6 to rotate together. During operation, the laser clearance detection component 6 and the through-hole slip ring component 7 do not contact the threads of the nut post 1. During the operation of the ship lift emergency safety mechanism, this device is closely connected to the mechanism. If the emergency safety mechanism experiences a sudden vertical movement, the detection data obtained by the laser clearance detection component 6 will immediately reflect the corresponding change in the threaded joint clearance and transmit this signal to the control room. This allows for rapid implementation of necessary measures, effectively preventing further deterioration of the fault and avoiding more serious equipment damage. This not only reduces long-term maintenance costs but also significantly reduces downtime caused by malfunctions, improving the overall operating efficiency of the equipment.

[0044] like Figure 3 As shown, the laser gap detection assembly 6 includes a spiral support surface 11, a laser sensor 12, a support rod 13, and a clamp 14.

[0045] The clamp 14 is fitted onto the spherical hinge 5 and tightly grips the spherical hinge 5. The diameter of the clamp 14 is the same as the diameter of the spherical hinge 5. A support rod 13 is welded to the upper end of the clamp 14, and a spiral bracket support surface 11 is welded to the upper end of the support rod 13.

[0046] The support rod 13 and the spiral bracket support surface 11 all maintain a certain gap with the spherical hinge 5, so that they do not come into contact with each other and avoid interference during operation.

[0047] Multiple laser sensors 12 are mounted on the support surface 11 of the spiral bracket. Since the laser gap detection component 6 needs to pass through four stages to complete one rotation—the first stage passing through the nut column 1 (range c°), the second stage passing through the gap between the two tiles (range λ = 180 - c°), the third stage passing through the nut column 1 (range c°), and the fourth stage passing through the gap between the two tiles (range λ = 180 - c°)—the maximum number of laser sensors 12 is a = 360° ÷ c°. The selection principle for the number of laser sensors 12 should be "to meet the real-time measurement requirements with the fewest possible number of laser sensors 12," ensuring that the laser gap detection component 6 can perform effective data detection when rotating relative to the nut column 1 at any angle, thus realizing the real-time detection function of the threaded pair gap in the accident safety mechanism—therefore, A laser sensors are selected, and A ≤ a.

[0048] By selecting the number of laser sensors 12 as described above, the goal is to achieve real-time detection of the threaded joint gap, ensuring that at least one laser sensor 12 can continuously acquire valid values, thereby forming a continuous data stream. To avoid the phenomenon of "empty measurement" of the laser sensor 12 during rotation, i.e., invalid measurement caused by the sensor being unable to align with the measurement target when rotating to the gap between two tiles, the strict requirements of the laser sensor 12 on the installation angle and the convenience of subsequent maintenance must also be fully considered when selecting the number.

[0049] like Figure 6 As shown, A laser sensors 12 are evenly distributed on the support surface 11 of the bracket at an angle of ղ = 360° ÷ A. The helix angle of the spiral support surface 11 is the same as the thread helix angle of the safety screw 3, and the height of the support rod 13 is calculated and set according to the height required for one revolution of the teeth of the safety screw 3. The trajectory length range of the spiral support surface 11 is [(d1+d2)× ,(d1+d2)× d1 is the diameter of the spherical hinge 5, and d2 is the distance between the support surface 11 of the helical bracket and the spherical hinge 5.

[0050] like Figure 9 As shown, the A laser sensors 12 are installed in series. Their installation angle must meet two conditions. The first condition is that the emitted laser is perpendicular to the midpoint of the lower thread surface of the nut column 1. The second condition is that the laser is emitted along the diameter direction of the spherical hinge 5. This ensures that even when the safety screw 3 moves up and down to the maximum distance under extreme conditions, the laser emitted by the laser sensor 12 can still reach the lower thread surface of the nut and be successfully received.

[0051] The aforementioned detection device evenly distributes A laser sensors 12 on the support surface 11 of the screw bracket, achieving real-time detection of the threaded pair clearance using a specified installation angle and height. Simultaneously, it ensures that even under extreme conditions, when the safety screw 3 moves up and down to its maximum distance, the laser sensors can continuously and stably emit laser light, which is reflected onto the lower thread surface of the nut post 1. This satisfies the requirement of maintaining detection accuracy and reliability even under extreme conditions.

[0052] The installation position of the A laser sensors 12 simulates the rotation path of the safety screw 3, ensuring that the A laser sensors 12 can rotate relative to the safety screw 3 at the same speed, thereby realizing real-time monitoring of the threaded pair clearance data.

[0053] like Figure 4 As shown, the through-hole slip ring assembly 7 includes a stator 21 and a rotor 22.

[0054] The outer diameter of the spherical hinge 5 is the same as the inner diameter of the rotor 22 of the through-hole electric slip ring assembly 7, and the outer diameter of the stator 21 of the through-hole electric slip ring assembly 7 is smaller than the outer diameter of the upper guide frame 2.

[0055] The rotor 22 has an embedded conductive ring inside, and the stator 21 has an embedded brush inside. The rotor 22 generates electrical energy by rotating through the spherical hinge 5.

[0056] The conductive ring maintains contact with the brush, thereby ensuring the transmission of signals and power. This enables the through-hole slip ring assembly 7 to power the laser sensor 12, while the data detected by the laser sensor 12 is transmitted to the PLC through the through-hole slip ring assembly 7.

[0057] The aforementioned component allows the ball joint 5 to rotate, driving the through-hole slip ring assembly 7 to rotate and conduct electricity, ensuring stable signal and power transmission. It can be widely used in various applications requiring rotational signal and power transmission, effectively solving the problem of wire winding.

[0058] like Figure 5 As shown, there are 10 stator wires 23, 10 rotor wires 24, one set of anti-rotation plates 25, one set of fixing forks 26, 4 first screws 27, 4 second screws 28, 4 second screw fixing holes 29, and two vertical cut surfaces 30.

[0059] The 10 stator conductors 23 are located at the lower end of the stator 21, and the 10 rotor conductors 24 are located at the upper end of the rotor 22. Each of the stator conductors 23 and rotor conductors 24 is configured with 10 wires, of which 2 are dedicated to power supply, 3 are used for signal transmission, and the remaining 5 are reserved for future expansion.

[0060] The four first screws 27 are used to fix the through-hole slip ring assembly 7 and the spherical hinge 5. To improve installation convenience and assembly efficiency, the through-hole slip ring assembly 7 is assembled in half according to the vertical cut surface 30. The vertical cut surface 30 is fixed by the second screw 28 passing through the screw fixing hole 29. One end of the anti-rotation plate 25 is installed at the lower end of the stator 21, and the other end of the anti-rotation plate 25 is fixed to the upper guide frame 2 by the fixing fork 26.

[0061] like Figure 8 The image shown is a cross-sectional view of the through-hole slip ring assembly connected to the spherical hinge, with one-quarter of the length removed.

[0062] A method for detecting the clearance of threaded joints in a ship lift accident safety mechanism includes the following steps:

[0063] Step 1: The through-hole slip ring assembly 7 is mounted in half on the upper guide frame 2 and fitted onto the spherical hinge 5. Above the through-hole slip ring assembly 7, a clamp 14 is installed, also fitted onto the spherical hinge 5, maintaining a 100mm gap between it and the through-hole slip ring assembly 7. A helical bracket is installed at the upper end of the clamp 14, which simulates the thread of the safety screw 3, and its thread helix angle is consistent with that of the safety screw 3.

[0064] Step 2: During operation, the spherical hinge 5 will drive the rotor 22 of the through-hole slip ring assembly 7 and the laser gap detection assembly 6 to rotate together. During the detection process, it is necessary to ensure that the laser gap detection assembly 6 and the through-hole slip ring assembly 7 do not come into contact with the threads of the nut column during operation.

[0065] Step 3: During the lifting and lowering process of the ship lift, the threaded clearance detection of the accident safety mechanism is allowed to have an error range of 2mm at both the top and bottom. The safety screw 3 rotates synchronously inside the nut column 1. The initial measurement of the lower thread surface of the nut column 1 by the laser sensor 12 is recorded as L. 初 The value in real-time detection is N. 测 When |N 测 -L 初 When |≤2mm, it will operate normally. When the clearance between the safety screw 3 and the nut column 1 changes, it will cause N 测 -L 初 If the clearance is greater than 2mm, the machine will stop and display a "thread pair clearance variation limit fault" message. At this time, the clearance of the safety mechanism's thread pair increases, and the safety screw shifts downwards. When the clearance between the safety screw 3 and the nut column 1 changes, causing N... 测 -L 初 If the clearance is less than -2mm, the machine will stop and display the message "Thread pair clearance variation limit fault". At this time, the clearance of the safety mechanism thread pair becomes smaller and the safety screw deflects upward.

Claims

1. A device for detecting the clearance of threaded pairs in a ship lift accident safety mechanism, characterized in that: The threaded pair clearance is the clearance between the upper and lower threaded surfaces of the safety screw (3) and the nut column (1). The safety screw (3) is installed between the upper guide frame (2) and the lower guide frame (4). The spherical hinge (5) is located at the upper end of the upper guide frame (2) and is used to fix the safety screw (3). When the power drives the spherical hinge (5) to rotate, it drives the safety screw (3) to rotate together. The spherical hinge (5) and the safety screw (3) make a spiral free-spinning motion relative to the nut column (1). The upper guide frame (2) and the lower guide frame (4) do not make a rotational motion and can slide along the upper and lower direction of the outer wall of the nut column (1). The detection device includes a laser gap detection component (6) and a through-hole electric slip ring component (7). The laser gap detection assembly (6) includes a helical support surface (11), a laser sensor (12), and a clamp (14). The clamp (14) is mounted on a spherical hinge (5). The upper end of the clamp (14) is equipped with the helical support surface (11). Multiple laser sensors (12) are mounted on the helical support surface (11). The helix angle of the helical support surface (11) is the same as the thread helix angle of the safety screw (3). The multiple laser sensors (12) are helically distributed and have the same thread helix angle as the safety screw (3). The multiple laser sensors (12) emit lasers along the radial direction of the spherical hinge (5). The lasers are perpendicular to the nut column (1), and the lasers emitted by the laser sensors (12) are perpendicular to the midpoint of the lower thread surface of the nut column (1). The through-hole slip ring assembly (7) includes a stator (21) and a rotor (22); The lower end of the stator (21) is mounted on the upper guide frame (2), the rotor (22) is mounted on the spherical hinge (5), the rotor (22) is embedded with a conductive ring, and the stator (21) is embedded with a brush, and the conductive ring and the brush are in contact. The through-hole slip ring assembly (7) is used to power the laser sensor (12); at the same time, the through-hole slip ring assembly (7) transmits the data detected by the laser sensor (12) to the PLC controller; When the spherical hinge (5) rotates, it drives the rotor (22) of the through-hole slip ring assembly (7) and the laser gap detection assembly (6) to rotate together.

2. The threaded pair clearance detection device for a ship lift accident safety mechanism according to claim 1, characterized in that: The number of laser sensors (12) is A, A≤a, a=360°÷c°, where c is the angle between the edge of each tile and the center line in the nut column (1); A laser sensors (12) are evenly distributed on the support surface (11) of the bracket at an interval of ղ=360°÷A.

3. The threaded pair clearance detection device for a ship lift accident safety mechanism according to claim 1, characterized in that: The spiral support surface (11) and the clamp (14) are supported by multiple support rods (13).

4. The threaded pair clearance detection device for a ship lift accident safety mechanism according to claim 1, characterized in that: The through-hole slip ring assembly (7) is assembled from two halves, left and right.

5. The threaded pair clearance detection device for a ship lift accident safety mechanism according to claim 1, characterized in that: The lower end of the through-hole slip ring assembly (7) is fixed to the upper guide frame (2) by an anti-rotation plate (25) and a fixed fork (26).

6. A method for detecting the clearance of a threaded pair clearance detection device for a ship lift accident safety mechanism according to any one of claims 1-5, comprising the following steps: Step 1: The through-hole slip ring assembly (7) is installed in half on the upper guide frame (2) and fitted onto the spherical hinge (5); above the through-hole slip ring assembly (7), a clamp (14) is installed, which is also fitted onto the spherical hinge (5) and maintains a certain distance from the through-hole slip ring assembly (7); a laser sensor (12) is installed on the spiral bracket support surface (11) at the upper end of the clamp (14). Step 2: During operation, the spherical hinge (5) will drive the rotor (22) of the through hole slip ring assembly (7) and the laser gap detection assembly (6) to rotate together; during operation, it is necessary to ensure that the laser gap detection assembly (6) and the through hole slip ring assembly (7) do not come into contact with the threads of the nut column (1); Step 3: During the lifting process of the ship lift, the safety screw (3) rotates synchronously inside the nut column (1). The initial measurement data of the distance between the laser sensor (12) and the lower thread surface of the nut column (1) is recorded as L. 初 The value in real-time detection is N. 测 When |N 测 -L 初 When |≤2mm, it will operate normally; when the clearance between the safety screw (3) and the nut column (1) changes, causing N 测 -L 初 If the clearance is greater than 2mm, the machine will stop and display the message "Threaded pair clearance variation limit fault". At this time, the clearance of the safety mechanism threaded pair increases and the safety screw deflects downward. When the clearance of the threaded pair between the safety screw (3) and the nut column (1) changes, causing N 测 -L 初 If the clearance is less than -2mm, the machine will stop and display the message "Thread pair clearance variation limit fault". At this time, the clearance of the safety mechanism thread pair becomes smaller and the safety screw deflects upward.

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