Thread pair gap detection device of ship lift accident safety mechanism

Abstract

A ship lift accident safety mechanism thread pair gap detection device comprises a laser gap detection assembly and a via hole electric slip ring assembly. The laser gap detection assembly comprises a hoop, a spiral support supporting face is installed at the upper end of the hoop, a plurality of laser sensors are installed on the spiral support supporting face, and the multiple laser sensors are distributed in a spiral mode and are the same as the lead angle of 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; 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; meanwhile, the via hole electric slip ring assembly transmits data detected by the laser sensor to the PLC. The screw thread pair gap detection device of the ship lift accident safety mechanism can realize real-time detection of the screw thread pair gap.

Description

Technical Field

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

[0002] The accident safety mechanism in a fully balanced vertical ship lift is a key component and plays a vital role in ensuring safety. During the lift's lift, 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, a certain clearance exists between the two in both the upper and lower directions, referred to as the accident safety mechanism thread pair clearance. This ensures the stable operation of the lift.

[0003] The accident safety mechanism of a fully balanced vertical ship lift plays a vital role, and its importance cannot be ignored. In the face of emergencies such as water loss in the cabin, water ingress into the cabin, shipwreck accidents, and overload, the accident safety mechanism can respond quickly. These sudden situations will disrupt the equilibrium 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 bear 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, ensuring that the cabin remains stable during maintenance.

[0004] However, during the process of lifting the cabin, abnormal circumstances may occur, such as the influence of various factors such as stroke deviation, which may cause the gap of the threaded pair of the accident safety mechanism 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 clearance of the threaded pair of the accident safety mechanism. Through real-time detection of the clearance of the threaded pair of the accident safety mechanism, it can be discovered in time and the ship lift operation can be automatically stopped to avoid major accidents and ensure the safe and stable operation of the ship lift.

[0006] Patent application number "202310112392.X," titled "A Shiplift Safety Mechanism Gap Detection Device and Method," is also used for threaded pair gap detection. This device utilizes a sliding contact assembly for power supply. Compared to through-hole slip rings, the copper conductors of the sliding contact assembly are exposed to the external environment for a long period of time, which can lead to surface oxidation and accumulation of dirt. In particular, they can corrode in certain harsh environments, requiring regular maintenance. Otherwise, these issues can lead to unstable power supply, signal loss, and other issues, increasing maintenance costs. In comparison, through-hole slip rings incorporate brushes and copper conductors within the slip ring, isolating them from the external environment and significantly extending their service life. Through-hole slip rings are wear-resistant and corrosion-resistant, maintaining stable performance in a variety of harsh environments. They require virtually no maintenance during use, effectively reducing maintenance costs. Through-hole slip rings transmit precise signals with low electrical noise, demonstrating greater reliability and accuracy in signal transmission. Furthermore, through-hole slip rings can provide continuous and uninterrupted power to the equipment during high-speed rotation, improving power supply stability and resolving wiring and winding challenges for rotating equipment, ensuring the normal operation of the equipment. In terms of detection principles, this device uses a proximity switch, which cannot monitor the thread pair clearance in real time. The system only shuts down and issues an alarm when the thread pair clearance narrows to the point of contact with the proximity switch. This patent, however, utilizes a combination of a spiral bracket and a laser rangefinder to monitor the thread pair clearance in real time, significantly improving the ability to predict gap change trends. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a thread pair clearance detection device for an accident safety mechanism of a ship lift, which can realize real-time detection of the thread pair clearance. Its 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.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] 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;

[0010] The laser gap detection assembly includes a clamp, which is mounted on the spherical hinge. A spiral bracket support surface is mounted on the upper end of the clamp, and a plurality of laser sensors are mounted on the spiral bracket support surface. The plurality of laser sensors are distributed in a spiral 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 hinge, and the lasers are vertically directed toward the nut column 1.

[0011] The through-hole electric slip ring assembly includes a stator and a rotor;

[0012] The lower end of the stator is mounted on the upper guide frame, and the rotor is mounted on the spherical hinge. A conductive ring is embedded in the rotor, and a brush is embedded in the stator. The conductive ring and the brush are kept in contact.

[0013] 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.

[0014] 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 of the nut column; A laser sensors 12 are evenly distributed on the support surface of the bracket at an angle of ղ=360°÷A.

[0015] The spiral rise angle of the spiral bracket support surface is the same as the thread rise angle of the safety screw, and the spiral bracket support surface and the clamp are supported by multiple support rods.

[0016] The laser emitted by the laser sensor is perpendicular to the midpoint of the lower thread surface of the nut column.

[0017] The through-hole electric slip ring assembly is assembled into two halves, the left and the right halves.

[0018] 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.

[0019] The utility model provides a thread pair clearance detection device for a ship lift accident safety mechanism, which has the following technical effects:

[0020] 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 monitoring the thread pair clearance data. When abnormal data is detected, the system automatically shuts down, avoiding accidents caused by the disappearance of thread pair clearance in the ship lift and improving overall operational safety.

[0021] 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 prevent the failure from further developing and causing more serious damage, thereby reducing maintenance costs and downtime.

[0022] 3) The laser sensor has the characteristics of high precision and fast response. It can reflect the actual changes in the thread pair clearance in real time, improve detection efficiency and accuracy, and provide reliable data support for equipment maintenance.

[0023] 4) Through the clever design of the spiral bracket support surface, the spiral rise angle of the spiral bracket support surface is the same as the rise 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 clearance of the accident safety mechanism thread pair.

[0024] 5) By configuring a through-hole electric slip ring assembly, this assembly is specially designed to provide a stable power supply and signal transmission channel for the laser gap detection assembly, effectively solving the winding problem caused by rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0027] Figure 2 for Figure 1 A partial enlarged schematic diagram.

[0028] Figure 3 This is a schematic structural diagram of the laser gap detection component in the present invention.

[0029] Figure 4 This is a schematic structural diagram of the through-hole electric slip ring assembly in the present invention.

[0030] Figure 5 This is the front view of the through-hole electric slip ring assembly in the utility model.

[0031] Figure 6 This is a distribution diagram of the laser sensors in the present invention (in the figure: the pitch is L, ①, ②, and ③ represent different laser sensors respectively).

[0032] Figure 7 It is a top view of the overall structure of the utility model.

[0033] Figure 8 This is a cross-sectional view of the connection between the through-hole electric slip ring assembly and the spherical hinge in the utility model.

[0034] Figure 9 This is a state diagram of the thread pair clearance detection of the utility model (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).

[0035] 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, anti-rotation 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

[0036] A device for detecting the thread pair clearance of a ship lift accident safety mechanism is used to detect the thread pair clearance of the ship lift accident safety mechanism. The thread pair clearance of the ship lift accident safety mechanism is the clearance between the safety screw 3 and the nut 1 above and below.

[0037] 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 is composed of two tile structures. Each tile structure has a thread in the range of c°. A slot is opened between the two pieces to accommodate the cantilever structure of the cabin. Each slot has a gap of λ=180-c°.

[0038] 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.

[0039] like Figure 1-2 As shown, a device for detecting the gap between threaded pairs of a ship lift accident safety mechanism includes a laser gap detection assembly 6 and a through-hole electric slip ring assembly 7. The laser gap detection assembly 6 is fixed to the spherical hinge 5 and is spaced 100 mm apart from the through-hole electric slip ring assembly 7. The through-hole electric slip ring assembly 7 is mounted on the upper guide frame 2, and its rotor 22 is centered on the spherical hinge 5. When the spherical hinge 5 rotates, it 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, the laser gap detection assembly 6 and the through-hole electric slip ring assembly 7 do not contact the threads of the nut column 1. During operation, the device is tightly connected to the accident safety mechanism. Once the accident safety mechanism suddenly moves up or down, the detection data obtained by the laser gap detection assembly 6 will immediately reflect the corresponding change in the gap between threaded pairs, and the signal will be transmitted to the control room, allowing necessary measures to be taken quickly, 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.

[0040] 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.

[0041] The clamp 14 is sleeved on the spherical hinge 5 and is tightly clamped with the spherical hinge 5. 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 to the support rod 13, and the upper end of the support rod 13 is welded to the spiral bracket support surface 11.

[0042] The support rod 13 and the spiral bracket support surface 11 retain a certain gap with the spherical hinge 5 and do not contact each other, thereby avoiding interference during operation.

[0043] The spiral bracket support surface 11 is equipped 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°. The principle for selecting the number of laser sensors 12 should be "using the minimum number of laser sensors 12 possible to meet the needs of real-time measurement" 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, realizing the real-time detection function of the threaded pair gap of the accident safety mechanism, then A laser sensors are selected, and A≤a.

[0044] 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. To avoid "empty measurements" during the rotation process of the laser sensor 12, that is, when the sensor rotates to the gap between two tiles and fails to align with the measurement target, resulting in invalid measurements, the number of laser sensors 12 must also be fully considered. The strict requirements for the installation angle of the laser sensors 12 and the convenience of subsequent maintenance must be fully considered when selecting the number of laser sensors 12.

[0045] like Figure 6 As shown, A laser sensors 12 are evenly distributed on the support surface 11 at an angle 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. 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.

[0046] like Figure 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.

[0047] The above-mentioned detection device evenly distributes A laser sensors 12 on the screw support surface 11, utilizing specified mounting angles and heights to achieve real-time detection of thread pair clearance. This also ensures that, even in extreme conditions, the laser sensors can continuously and stably emit laser light, which is reflected by the lower thread surface of the standoff 1, even when the safety screw 3 moves up and down to its maximum distance. This ensures that detection accuracy and reliability are maintained even under extreme conditions.

[0048] 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 rotate relative to the safety screw 3 at the same speed, thereby realizing real-time monitoring of the thread pair clearance data.

[0049] like Figure 4 As shown, the through-hole electric slip ring assembly 7 includes a stator 21 and a rotor 22 .

[0050] 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 .

[0051] The rotor 22 is embedded with a conductive ring, and the stator 21 is embedded with a brush. The rotor 22 rotates through the spherical hinge 5 to generate electrical energy.

[0052] The conductive ring and the brush maintain contact, thereby ensuring 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 at the same time, the data detected by the laser sensor 12 is transmitted to the PLC through the through-hole electric slip ring assembly 7.

[0053] The above-mentioned component can rotate through the spherical hinge 5, driving 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.

[0054] like Figure 5As 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.

[0055] The ten stator conductors 23 are at the lower end of the stator 21, and the ten rotor conductors 24 are at the upper end of the rotor 22. The stator conductors 23 and rotor conductors 24 each have ten wires, two of which are dedicated to power, three for signal transmission, and the remaining five for backup and future expansion.

[0056] The four first screws 27 are used to secure the through-hole electric slip ring assembly 7 to the spherical hinge 5. To improve installation simplicity and assembly efficiency, the through-hole electric slip ring assembly 7 is assembled in half along the vertical section 30. The vertical section 30 is secured with a second screw 28 passing through a screw fixing hole 29. One end of the anti-rotation plate 25 is mounted on the lower end of the stator 21, and the other end of the anti-rotation plate 25 secures the through-hole electric slip ring assembly 7 to the upper guide frame 2 via a fixing fork 26.

[0057] like Figure 8 Shown is a quarter-cut cross-sectional view of a through-hole electric slip ring assembly and a spherical hinge connection.

[0058] A method for detecting the clearance of threaded pairs of a ship lift accident safety mechanism comprises the following steps:

[0059] Step 1: The through-hole slip ring assembly 7 is mounted in half on the upper guide frame 2 and placed over the spherical hinge 5. A clamp 14 is installed above the through-hole slip ring assembly 7. The clamp 14 also fits over the spherical hinge 5, maintaining a 100mm gap between the through-hole slip ring assembly 7. A spiral bracket is mounted above the clamp 14. This bracket simulates the threads of the safety screw 3 and has the same thread lead angle as the safety screw 3.

[0060] Step 2: During operation, the spherical hinge 5 rotates the rotor 22 of the through-hole electric slip ring assembly 7 and the laser gap detection assembly 6. 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 come into contact with the threads of the nut standoff during operation.

[0061] Step 3: During the lifting process of the ship lift, the clearance detection of the accident safety mechanism thread pair is allowed to have an error range of 2mm 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 clearance between the thread pair of 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 deviates 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 deviates upward.

Claims

1. A device for detecting the clearance of threaded pairs of a ship lift accident safety mechanism, characterized in that: It includes a laser gap detection component (6) and a through-hole electric slip ring component (7); The laser gap detection assembly (6) includes a hoop (14), which is mounted on the spherical support hinge (5), a spiral bracket support surface (11) being mounted on the upper end of the hoop (14), and a plurality of laser sensors (12) being mounted on the spiral bracket support surface (11), wherein the plurality of laser sensors (12) are distributed in a spiral manner and have the same thread lead angle as the safety screw (3); the plurality of laser sensors (12) emit laser light along the radial direction of the spherical support hinge (5), and the laser light is vertically emitted 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), and the rotor (22) is mounted on the spherical support hinge (5). A conductive ring is embedded in the rotor (22), and a brush is embedded in the stator (21), and the conductive ring and the brush are kept in contact; 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 the PLC controller.

2. The device for detecting the thread pair clearance of 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°, and c is 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 angle of interval ղ=360°÷A.

3. The device for detecting the thread pair clearance of a ship lift accident safety mechanism according to claim 1, characterized in that: The spiral support support surface (11) has a spiral lead angle that 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 the thread pair clearance of a ship lift accident safety mechanism according to claim 1, characterized in that: The laser light emitted by the laser sensor (12) is perpendicular to the midpoint of the lower thread surface of the nut column (1).

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

6. The device for detecting the 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).

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