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

Abstract

The invention discloses a ship lift accident safety mechanism thread pair gap detection device and method. The device mainly comprises a laser gap detection assembly and a via hole electric slip ring assembly. The laser gap detection assembly comprises a hoop, the hoop is mounted on the spherical trunnion, a spiral support supporting surface is mounted at the upper end of the hoop, a plurality of laser sensors are mounted on the spiral support supporting surface, and the plurality of laser sensors are spirally distributed and have the same lead angle as the safety screw; the plurality of laser sensors emit laser in the radial direction of the spherical trunnion, and the laser is vertically emitted to the nut column 1; the via hole electric slip ring assembly comprises a stator and a rotor. The lower end of the stator is mounted on the upper guide frame, the rotor is mounted on the spherical trunnion, a conducting ring is embedded in the rotor, an electric brush is embedded in the stator, and the conducting ring is in contact with the brush; the via hole electric slip ring assembly is used for supplying power to the laser sensor; meanwhile, the via hole electric slip ring assembly transmits data detected by the laser sensor to the PLC. According to the ship lift accident safety mechanism thread pair gap detection device and method, real-time detection of the thread pair gap can be achieved.

Description

Technical Field

[0001] The invention relates to a thread pair clearance detection device, in particular to a thread pair clearance detection device and method for an accident safety mechanism of a ship lift. Background Art

[0002] The accident safety mechanism in the fully balanced vertical ship lift is a key component of the ship lift and plays a vital role in safety protection. During the lifting process of the ship cabin, the rotating screw rises and falls synchronously with the pinion of the driving mechanism, and the screw thread and the thread surface of the nut column do not contact each other. During installation, there is a certain gap between the two in both the upper and lower directions, which is referred to as the accident safety mechanism thread pair gap, thereby protecting the stable operation of the ship lift.

[0003] The accident safety mechanism of the fully balanced vertical ship lift plays a vital role and its importance cannot be ignored. In the face of emergency situations such as water loss in the cabin, water in the cabin, shipwreck accidents, overload, etc., the accident safety mechanism can respond quickly. These emergencies will break the balance of the cabin, causing the thread pair clearance in the accident safety mechanism to gradually decrease until it disappears completely. The accident safety mechanism can carry the unbalanced load of the cabin and transfer it to the tower column concrete structure through the screw and nut column, effectively preventing the cabin from continuing to tilt or sink, thereby ensuring the safety of the ship and passengers. In addition, the accident safety mechanism also plays an indispensable role in maintenance work. When the cabin needs to be emptied for inspection, the accident safety mechanism can serve as a locking support for the cabin to ensure that the cabin remains stable during maintenance.

[0004] However, during the lifting and lowering of the cabin, abnormal circumstances may occur, such as the influence of various factors such as stroke deviation, which may cause the gap of the accident safety mechanism thread pair to become smaller until the gap disappears, thereby causing the accident safety mechanism to get stuck, the transmission mechanism to rotate under the action of external load, and the torque transmitted by the safety clutch to increase sharply, causing major equipment failure of the ship lift.

[0005] In summary, it is particularly important to detect the thread pair clearance of the accident safety mechanism. Through real-time detection of the thread pair clearance of the accident safety mechanism, it can be discovered in time and automatically stop the operation of the ship lift, avoiding the occurrence of 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 thread pair clearance detection device and method for a ship lift accident safety mechanism, which can realize real-time detection of the thread pair clearance. The detection method needs to have good on-site adaptability and high-precision detection capability to ensure that the ship lift equipment can maintain a safe and stable operating condition under any operating conditions.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A thread pair gap detection device for a ship lift accident safety mechanism, comprising a laser gap detection component and a through-hole electric slip ring component; The laser gap detection assembly includes a hoop, which is mounted on the spherical support hinge. A spiral bracket support surface is mounted on the upper end of the hoop, and a plurality of laser sensors are mounted on the spiral bracket support surface. The plurality of laser sensors are distributed in a spiral manner and have the same thread lead angle as the safety screw. The plurality of laser sensors emit lasers along the radial direction of the spherical support hinge, and the lasers are vertically emitted toward the nut column 1. The through-hole electric slip ring assembly comprises a stator and a rotor; The lower end of the stator is mounted on the upper guide frame, the rotor is mounted on the spherical hinge, a conductive ring is embedded in the rotor, a brush is embedded in the stator, and the conductive ring keeps in contact with the brush; The through-hole electric slip ring assembly is used to power the laser sensor; at the same time, the through-hole electric slip ring assembly transmits the data detected by the laser sensor to the PLC controller.

[0008] The number of the laser sensors is A, A≤a, a=360°÷c°, 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 interval of ղ=360°÷A.

[0009] The helix angle of the spiral bracket support surface is the same as the thread angle of the safety screw, and the spiral bracket support surface and the clamp are supported by a plurality of support rods.

[0010] The laser emitted by the laser sensor is perpendicular to the midpoint of the lower thread surface of the nut column.

[0011] The through-hole electric slip ring assembly is assembled in half by left and right halves.

[0012] The lower end of the through-hole electric slip ring assembly is fixed on the upper guide frame through a rotation-stopping plate and a fixed fork.

[0013] A method for detecting thread pair clearance of a ship lift accident safety mechanism comprises the following steps: Step 1: The through-hole electric slip ring assembly is installed in half on the upper guide frame and sleeved on the spherical support hinge; a clamp is installed above the through-hole electric slip ring assembly, and the clamp is also sleeved on the spherical support hinge and keeps a certain distance from the through-hole electric slip ring assembly; a laser sensor is installed on the supporting surface of the spiral bracket at the upper end of the clamp; Step 2: During operation, the spherical hinge will drive the rotor of the through-hole electric 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 electric slip ring assembly do not contact the thread of the nut column; Step 3: During the lifting process of the ship lift, the safety screw rotates synchronously in the nut column, and 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 |≤2mm, it is operating normally; when the clearance between the thread pair of the safety screw and the nut column changes, N 测 -L 初 >2mm, the machine will stop and prompt "thread pair clearance change limit fault". At this time, the thread pair clearance of the safety mechanism becomes larger and the safety screw moves downward; when the thread pair clearance of the safety screw and the nut column changes, N 测 -L 初 If the value is less than -2mm, the machine will stop and prompt "thread pair clearance change limit fault". At this time, the thread pair clearance of the safety mechanism becomes smaller and the safety screw is offset upward.

[0014] The present invention provides a device and method for detecting the thread pair clearance of a ship lift accident safety mechanism, which has the following technical effects: 1) By deploying multiple laser sensors and cleverly using their installation positions to simulate the threads of the rotating screw, the distance between the device and the nut is detected in real time, thereby realizing the monitoring of the thread pair clearance data. When abnormal data is detected, the system automatically shuts down to avoid accidents caused by the disappearance of the thread pair clearance of the ship lift and improve the overall operation safety.

[0015] 2) Due to the real-time detection of this device, signs of equipment failure can be discovered in advance, and maintenance measures can be taken in time to avoid further development of the failure and cause more serious damage, thereby reducing maintenance costs and downtime.

[0016] 3) The laser sensor has the characteristics of high precision and fast response. It can reflect the actual changes of the thread pair clearance in real time, improve the detection efficiency and accuracy, and provide reliable data support for equipment maintenance.

[0017] 4) Through the clever design of the spiral bracket support surface, the spiral lead angle of the spiral bracket support surface is the same as the lead angle of the safety screw, ensuring that the laser gap detection component can maintain relative movement 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 the detection data can be reflected as the change in the gap of the thread pair of the accident safety mechanism.

[0018] 5) Through-hole electric slip ring assembly is configured, which is specially designed to provide stable power supply and signal transmission channel for laser gap detection assembly, effectively solving the winding problem caused by rotation.

[0019] 6) The patent "A ship lift safety mechanism gap detection device and method" with application number "202310112392.X" is also used for thread pair gap detection. The device uses a sliding contact assembly to draw power. Compared with the through-hole electric slip ring power drawing method, the copper conductor of the sliding contact assembly is exposed to the external environment for a long time, and its surface is prone to oxidation or accumulation of dirt. Especially in some harsh environments, it may also be corroded, so it needs regular maintenance. Otherwise, these problems will lead to unstable power supply effect, signal transmission loss and other conditions, thereby increasing maintenance costs. In comparison, the through-hole electric slip ring sets the brush and copper conductor inside the slip ring, which is isolated from the external environment, greatly extending the service life. The through-hole electric slip ring has the advantages of wear resistance and corrosion resistance, so it can maintain stable performance in various harsh environments, and almost no maintenance is required during use, effectively reducing maintenance costs. The through-hole electric slip ring can transmit precise signals and has low electrical noise, so it shows stronger reliability and accuracy in signal transmission. In addition, the through-hole electric slip ring can continuously and uninterruptedly supply power when the equipment rotates at high speed, which improves the stability of power supply, solves the problems of wiring and winding of rotating equipment, and ensures the normal operation of the equipment. In terms of detection principle, the device uses a proximity switch, which cannot realize real-time monitoring of the thread pair gap. Only when the thread pair gap is reduced to contact with the proximity switch, the system will shut down and alarm. This patent uses a combination of a spiral bracket and a laser rangefinder, which can monitor the thread pair gap in real time, greatly improving the ability to predict the gap change trend. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 for Figure 1 A partial enlarged schematic diagram of .

[0022] Figure 3 It is a schematic diagram of the structure of the laser gap detection component in the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of the through-hole electric slip ring assembly in the present invention.

[0024] Figure 5 It is a front view of the through-hole electric slip ring assembly of the present invention.

[0025] Figure 6 This is a distribution diagram of the laser sensors in the present invention (in the diagram: the pitch is L, ①, ②, ③ represent different laser sensors respectively).

[0026] Figure 7 It is a top view of the overall structure of the present invention.

[0027] Figure 8 It is a cross-sectional view of the connection between the through-hole electric slip ring assembly and the spherical hinge in the present invention.

[0028] Fig. 9 This is a state diagram of thread pair clearance detection of the present invention (in the figure: a represents the upper limit laser emission point, b represents the normal laser emission point, and c represents the lower limit laser emission point).

[0029] In the figure: nut column 1, upper guide frame 2, safety screw 3, lower guide frame 4, ball hinge 5, laser gap detection assembly 6, through-hole electric slip ring assembly 7; spiral bracket support surface 11, laser sensor 12, support rod 13, clamp 14; stator 21, rotor 22, stator wire 23, rotor wire 24, stop plate 25, fixing fork 26, first screw 27, second screw 28, second screw fixing hole 29, vertical tangent 30, nut thread coverage 41, notch 42. DETAILED DESCRIPTION

[0030] A device for detecting thread pair clearance of a ship lift accident safety mechanism is used for detecting thread pair clearance of a ship lift accident safety mechanism. The thread pair clearance of the ship lift accident safety mechanism is the clearance between a safety screw 3 and a nut 1 above and below.

[0031] 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, and each nut column 1 is composed of two tile structures, each tile structure has a thread in the range of c°, and a slot is opened between the two pieces to accommodate the cantilever structure of the cabin, and each slot has a gap of λ=180-c°.

[0032] The safety screw 3 is installed between the upper guide frame 2 and the lower guide frame 4. The spherical hinge 5 is 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, the safety screw 3 is driven to rotate together. The spherical hinge 5 and the safety screw 3 perform spiral idling motion relative to the nut column 1. The upper guide frame 2 and the lower guide frame 4 do not perform rotational motion and can slide up and down along the outer wall of the nut column 1.

[0033] like Figure 1-2As shown, a thread pair gap detection device for a ship lift accident safety mechanism includes a laser gap detection component 6 and a through-hole electric slip ring component 7. The laser gap detection component 6 is fixed on the spherical support hinge 5 and is spaced 100 mm from the through-hole electric slip ring component 7. The through-hole electric slip ring component 7 is installed on the upper guide frame 2, and its rotor 22 takes the spherical support hinge 5 as the axis. When the spherical support hinge 5 rotates, the rotor 22 of the through-hole electric slip ring component 7 and the laser gap detection component 6 are driven to rotate together, and the laser gap detection component 6 and the through-hole electric slip ring component 7 do not contact the thread of the nut column 1 during operation. During the operation of the ship lift accident safety mechanism, the device is closely connected with the machine accident safety mechanism. Once the accident safety mechanism moves up and down suddenly, the detection data obtained by the laser gap detection component 6 will immediately reflect the corresponding changes in the thread pair gap, and the signal will be transmitted to the control room, so that necessary measures can be taken quickly and conveniently, thereby effectively preventing the fault from further deteriorating and avoiding more serious equipment damage. It not only reduces long-term maintenance costs, but also significantly reduces downtime caused by failures and improves the overall operating efficiency of the equipment.

[0034] like Figure 3 As shown, the laser gap detection assembly 6 includes a spiral bracket support surface 11, a laser sensor 12, a support rod 13, and a clamp 14.

[0035] The clamp 14 is sleeved on the spherical hinge 5 and is tightly clamped with the spherical hinge 5, and the diameter of the clamp 14 is the same as the diameter of the spherical hinge 5. The upper end of the clamp 14 is welded with a support rod 13, and the upper end of the support rod 13 is welded with a spiral bracket support surface 11.

[0036] The support rod 13 and the spiral bracket support surface 11 retain a certain gap with the spherical support hinge 5 and do not contact each other, thereby avoiding interference during operation.

[0037] The spiral bracket support surface 11 is installed with multiple laser sensors 12. Since the laser gap detection component 6 needs to go through four stages to rotate one circle, the first stage passes through the nut column 1, with a range of c°, the second stage passes through the gap between two tiles, with a range of λ=180-c°, the third stage passes through the nut column 1, with a range of c°, and the fourth stage passes through the gap between two tiles, with a range of λ=180-c°. The maximum number of laser sensors 12 is a =360°÷c°, and the principle for selecting the number of laser sensors 12 should be "using the minimum number of laser sensors 12 to meet the needs of real-time measurement as much as possible", to ensure that the laser gap detection component 6 can perform effective data detection when it rotates to any angle relative to the nut column 1, and realize the real-time detection function of the thread pair gap of the accident safety mechanism, then select A laser sensors, and A≤a.

[0038] When selecting the number of laser sensors 12, the goal is to achieve real-time thread pair clearance detection, ensuring that at least one laser sensor 12 can continuously obtain valid values, thereby forming a continuous data stream. In order to avoid the "empty measurement" phenomenon of the laser sensor 12 during the rotation process, that is, when the sensor rotates to the gap between two tiles, it is impossible to align the measurement target and cause invalid measurement, when selecting the number, it is also necessary to fully consider the strict requirements of the laser sensor 12 on the installation angle and the convenience of subsequent maintenance.

[0039] like Figure 6 As shown, A laser sensors 12 are evenly distributed on the support surface 11 at an interval of ղ=360°÷A. The helix angle of the spiral support surface 11 is the same as the thread angle of the safety screw 3, and the height of the support rod 13 is calculated and set according to the height required for the tooth surface of the safety screw 3 to rotate one circle. The track 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 gap distance between the spiral bracket support surface 11 and the spherical hinge 5.

[0040] like Fig. 9 As shown, the A laser sensors 12 are installed in series with each other, and their installation angles must meet two conditions. The first condition is that the emitted laser must be perpendicular to the midpoint of the lower thread surface of the nut column 1, and the second condition is that the laser must be emitted along the diameter direction of the spherical hinge 5 to ensure that under extreme conditions, when the safety screw 3 moves up and down the maximum distance, the laser emitted by the laser sensor 12 can still be on the lower thread surface of the nut and the emitted light can be received smoothly.

[0041] The above detection device evenly distributes A laser sensors 12 on the support surface 11 of the spiral bracket, and uses the specified installation angle and height to achieve real-time detection of the thread pair gap. At the same time, it ensures that in extreme cases, even if the safety screw 3 moves up and down to the maximum distance, the laser sensor can continuously and stably emit laser light to reflect on the lower thread surface of the nut column 1. This ensures that the accuracy and reliability of detection can be maintained under extreme conditions.

[0042] The installation positions of the A laser sensors 12 simulate the rotation path of the safety screw 3, ensuring that the A laser sensors 12 can perform relative rotational motion with the safety screw 3 at the same speed, thereby achieving real-time monitoring of the thread pair clearance data.

[0043] like Figure 4 As shown, the through-hole electric slip ring assembly 7 includes a stator 21 and a rotor 22 .

[0044] 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 .

[0045] The rotor 22 has a conductive ring embedded inside, the stator 21 has a brush embedded inside, and the rotor 22 generates electric energy by rotating through the spherical hinge 5 .

[0046] The conductive ring and the brush maintain contact to ensure the transmission of signals and power, so that the through-hole electric slip ring assembly 7 can supply power to the laser sensor 12 , and the data detected by the laser sensor 12 can be transmitted to the PLC through the through-hole electric slip ring assembly 7 .

[0047] The above-mentioned component can rotate through the spherical hinge 5 to drive the through-hole electric slip ring component 7 to rotate and conduct electricity, ensuring the stable transmission of signals and power. It can be widely used in various occasions that require rotational transmission of signals and power, and effectively solves the winding problem.

[0048] like Figure 5 As shown, there are 10 stator wires 23, 10 rotor wires 24, one pair of anti-rotation plates 25, one pair of fixed forks 26, four first screws 27, four second screws 28, four second screw fixing holes 29, and two vertical sections 30.

[0049] The 10 stator wires 23 are at the lower end of the stator 21, and the 10 rotor wires 24 are at the upper end of the rotor 22. The stator wire 23 and the rotor wire 24 are each configured with 10 wires, of which 2 are specifically used for power lines, 3 are used for signal transmission, and the remaining 5 are used as backup and later expansion.

[0050] The four first screws 27 are used to fix the through-hole electric slip ring assembly 7 and the spherical support hinge 5. In order to improve the ease of installation and assembly efficiency, the through-hole electric slip ring assembly 7 is assembled in half according to the vertical section 30. The vertical section 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 fixes the through-hole electric slip ring assembly 7 on the upper guide frame 2 through the fixing fork 26.

[0051] like Figure 8 Shown is a cross-sectional view of a through-hole electric slip ring assembly and a spherical hinge connection with one quarter cut away.

[0052] A method for detecting thread pair clearance of a ship lift accident safety mechanism comprises the following steps: Step 1: The through-hole electric slip ring assembly 7 is installed in half on the upper guide frame 2 and sleeved on the spherical support hinge 5. A clamp 14 is installed above the through-hole electric slip ring assembly 7. The clamp 14 is also sleeved on the spherical support hinge 5 and maintains a 100mm interval with the through-hole electric slip ring assembly 7. A spiral bracket is installed on the upper end of the clamp 14, which simulates the thread of the safety screw 3, and its thread lead angle is consistent with the thread lead angle of the safety screw 3.

[0053] Step 2: During operation, the spherical hinge 5 drives the rotor 22 of the through-hole electric 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 electric slip ring assembly 7 do not contact the thread of the nut column during operation.

[0054] Step 3: During the lifting process of the ship lift, the accident safety mechanism thread pair clearance detection is allowed to have an error range of 2 mm up and down. The safety screw 3 is synchronously idle in the nut column 1. The laser sensor 12 and the lower thread surface of the nut column 1 are initially measured and recorded as L 初 , the value in real-time detection is N 测 , when |N 测 -L 初 |≤2mm, it is operating normally. When the thread clearance between the safety screw 3 and the nut column 1 changes, N 测 -L 初 >2mm, the machine will stop and prompt "thread pair clearance change limit fault". At this time, the thread pair clearance of the safety mechanism becomes larger and the safety screw moves downward; when the thread pair clearance of the safety screw 3 and the nut column 1 changes, N 测 -L 初 If the value is less than -2mm, the machine will stop and prompt "thread pair clearance change limit fault". At this time, the thread pair clearance of the safety mechanism becomes smaller and the safety screw is offset upward.

Claims

1. A thread pair clearance detection device for a ship lift accident safety mechanism, characterized in that: It comprises a laser gap detection component (6) and a through-hole electric slip ring component (7); The laser gap detection assembly (6) comprises a hoop (14), the hoop (14) being mounted on the spherical support hinge (5), a spiral support support surface (11) being mounted on the upper end of the hoop (14), a plurality of laser sensors (12) being mounted on the spiral support support surface (11), the plurality of laser sensors (12) being distributed in a spiral and having the same thread lead angle as the safety screw (3); the plurality of laser sensors (12) emit lasers along the radial direction of the spherical support hinge (5), and the lasers are emitted vertically toward the nut column 1; The through-hole electric slip ring assembly (7) comprises 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 support hinge (5), a conductive ring is embedded in the rotor (22), a brush is embedded in the stator (21), and the conductive ring is in contact with the brush; The through-hole electric slip ring assembly (7) is used to supply power to the laser sensor (12); at the same time, the through-hole electric slip ring assembly (7) transmits data detected by the laser sensor (12) to a PLC controller.

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

3. The thread pair clearance detection device of the ship lift accident safety mechanism according to claim 1, characterized in that: The helical lead angle of the spiral support support surface (11) is the same as the thread lead angle of the safety screw (3), and the spiral support support surface (11) and the clamp (14) are supported by a plurality of support rods (13).

4. The device for detecting thread pair clearance of a ship lift accident safety mechanism according to claim 1, characterized in that: The laser emitted by the laser sensor (12) is perpendicular to the midpoint of the lower thread surface of the nut column (1).

5. The thread pair clearance detection device of the accident safety mechanism of a ship lift according to claim 1, characterized in that: The through-hole electric slip ring assembly (7) is assembled in half from the left and right halves.

6. The device for detecting thread pair clearance of a ship lift accident safety mechanism according to claim 1, characterized in that: The lower end of the through-hole electric slip ring assembly (7) is fixed to the upper guide frame (2) via a rotation-stopping plate (25) and a fixed fork (26).

7. A method for gap detection of a thread pair gap detection device of a ship lift accident safety mechanism according to any one of claims 1 to 6, comprising the following steps: Step 1: The through-hole electric slip ring assembly (7) is installed in half on the upper guide frame (2) and is sleeved on the spherical support hinge (5); a clamp (14) is installed above the through-hole electric slip ring assembly (7), and the clamp (14) is also sleeved on the spherical support hinge (5) and maintains a certain distance between the through-hole electric 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) drives the rotor (22) of the through-hole electric 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 electric slip ring assembly (7) do not come into contact with the thread of the nut column (1); Step 3: During the lifting process of the ship lift, the safety screw (3) rotates synchronously in the nut column (1), and 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 |≤2mm, it is operating normally; when the thread clearance between the safety screw (3) and the nut column (1) changes, N 测 -L 初 >2mm, the machine will stop and prompt "thread clearance change limit fault". At this time, the thread clearance of the safety mechanism becomes larger and the safety screw moves downward. When the thread clearance of the safety screw (3) and the nut column (1) changes, N 测 -L 初 If the value is less than -2mm, the machine will stop and prompt "thread pair clearance change limit fault". At this time, the thread pair clearance of the safety mechanism becomes smaller and the safety screw is offset upward.

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