Ship lift safety mechanism clearance adjustment device and adjustment method thereof

Abstract

A ship lift safety mechanism clearance adjustment device and adjustment method thereof, comprising a coupling and a driving device, wherein the coupling comprises a lower swivel support plate, a connecting shaft and a clamp, wherein the lower swivel support plate is coaxially connected to the connecting shaft, and the clamp is used to connect the lower swivel support plate to the upper swivel support plate of the driving shaft of the safety mechanism. The device realizes rapid adjustment of the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair through the reversing function of the bidirectional ratchet wrench, and the adjustment is accurate, and the installation and maintenance are convenient. The angle scale on the ratchet and the position pointer on the handle can accurately obtain the height data of the clearance adjustment, thereby improving the accuracy and efficiency of the clearance adjustment of the safety mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of gap adjustment of a ship lift safety mechanism, and in particular relates to a gap adjustment device for a ship lift safety mechanism and an adjustment method thereof. Background Art

[0002] The safety agency is the safety guarantee agency of the ship lift. Figures 5 to 7 As shown in the figure, during the lifting process of the ship compartment, the rotating screw rises and falls synchronously with the pinion of the driving mechanism, and the screw thread does not contact the thread surface of the nut column. During installation, there is a certain gap between the two in both the upper and lower directions. The cumulative error of the long-term operation stroke of the ship lift and the disassembly and assembly process of the safety mechanism require adjustment of the thread pair clearance of the safety mechanism. At present, when adjusting the clearance of the safety mechanism, the operation process is complicated, the operation space is small, and multiple people are required to operate. There are dangers in the operation, which seriously affects the safety and efficiency of the clearance adjustment of the safety mechanism of the ship lift. Summary of the invention

[0003] In view of the technical problems existing in the background technology, the present invention provides a ship lift safety mechanism gap adjustment device and an adjustment method thereof. The device realizes rapid adjustment of the upper gap and the lower gap of the safety mechanism threaded pair through the reversing function of a two-way ratchet wrench. The adjustment is precise and the installation and maintenance are convenient. The angle scale on the ratchet and the position pointer on the handle can accurately obtain the height data of the gap adjustment, thereby improving the accuracy and efficiency of the safety mechanism gap adjustment.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve:

[0005] A ship lift safety mechanism clearance adjustment device comprises a coupling and a driving device, wherein the coupling comprises a lower slewing support plate, a connecting shaft and a clamp, wherein the lower slewing support plate is coaxially connected to the connecting shaft, and the clamp is used to connect the lower slewing support plate to the upper slewing support plate of the safety mechanism driving shaft.

[0006] In a preferred embodiment, the lower rotating support disk is a splined circular ring structure, and the splined circular ring structure is used to engage with the splined circular ring structure of the upper rotating support disk.

[0007] In a preferred embodiment, the clamp comprises two arc-shaped fixed groove plates, which are detachably connected to each other; one end of the two arc-shaped fixed groove plates is hinged, and the other end is fixed by bolts; the inner wall of the arc-shaped fixed groove plates is a groove structure.

[0008] In a preferred embodiment, the driving device is a bidirectional ratchet wrench, which is used to drive the connecting shaft to rotate; the bidirectional ratchet wrench includes a ratchet, a ring-shaped convex tooth is provided at the center of the ratchet, and a ring-shaped tooth groove is provided at the lower part of the connecting shaft, and the ring-shaped tooth groove cooperates with the ring-shaped convex tooth.

[0009] In a preferred embodiment, the bidirectional ratchet wrench is provided with a scale ring and a pointer, the scale ring is parallel to and coaxially arranged with the ratchet; the scale ring is fixedly connected to the ratchet, and the pointer is arranged on the housing of the bidirectional ratchet wrench; the scale ring is connected to the ratchet through screws and gaskets, and a gap is provided between the scale ring and the housing of the bidirectional ratchet wrench; a limit plug is provided at the bottom of the bidirectional ratchet wrench, and the limit plug is used to be connected to the bottom of the connecting shaft through screws.

[0010] In a preferred solution, the bidirectional ratchet wrench is detachably provided with a force adding rod.

[0011] Step 1) Disconnect the connection between the reducer and the synchronous shaft at the driving point where the cabin attitude needs to be adjusted, adjust the cabin attitude to a horizontal level, and reinstall the synchronous shaft;

[0012] Step 2), respectively measure the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair to determine the clearance adjustment direction;

[0013] Step 3), remove the safety mechanism driving universal coupling, align and engage the lower swing support plate of the safety mechanism turning device with the upper swing support plate, and clamp the lower swing support plate and the upper swing support plate with a clamp;

[0014] Step 4), using the device to rotate the safety mechanism clockwise or counterclockwise, wherein when rotating clockwise, the upper clearance of the safety mechanism thread pair becomes larger, and the lower clearance of the safety mechanism thread pair becomes smaller, and when rotating counterclockwise, the upper clearance of the safety mechanism thread pair becomes smaller, and the lower clearance of the safety mechanism thread pair becomes larger;

[0015] Step 5) Measure the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair, and compare the clearance values. If ∣≤Δd0, then the gap adjustment is completed. If ∣ ∣>Δd0, then repeat step 4) until ∣ ∣≤Δd0, gap adjustment is completed;

[0016] Step 6) Reinstall the safety mechanism drive universal coupling and resume operation.

[0017] In the preferred solution, the rotation angle when adjusting the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair is ,in is the turning angle of the turning device, is the rotation angle of the rotating screw.

[0018] In a preferred embodiment, the ship lift safety mechanism turning method comprises the following steps:

[0019] Step 1), the cabin is parked at the maintenance position, and the counterweight frame is supported by a steel beam for maintenance;

[0020] Step 2), execute the cabin drainage process, connect the drainage pipeline, open the valve, and drain the cabin water;

[0021] Step 3), remove the safety mechanism rotary joint and the hydraulic pipeline connected to it;

[0022] Step 4) Install a limit device between the support rod of the safety mechanism and the inner hole at the lower end of the rotating screw to fix the support rod in a vertical state;

[0023] Step 5), remove the ball joint screw connecting the safety mechanism support rod and the cabin safety beam flange, so that the ball joint is disengaged from the safety beam flange;

[0024] Step 6), remove the safety mechanism driving universal coupling, align and engage the lower swing support plate of the safety mechanism turning device with the upper swing support plate, and clamp the lower swing support plate and the upper swing support plate with a clamp;

[0025] Step 7) Install a lifting ring on the lifting hole of the guide frame on the safety mechanism, and connect the top machine room inspection car hook to the lifting ring through the lifting wire rope;

[0026] Step 8) Determine whether the safety mechanism needs to be lifted or lowered, and then adjust the driving direction of the driving device;

[0027] Step 9), the maintenance vehicle controls the safety mechanism to slowly rise and fall, and at the same time, the safety mechanism is rotated synchronously through the turning device;

[0028] Step 10) Observe and measure the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair. ∣> , that is, the absolute value of the difference between the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair shall not be less than the fixed value, then the maintenance car and the turning device will stop at the same time;

[0029] Step 11), according to the measured values ​​of the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair, determine whether to turn the turning clockwise or counterclockwise, the inspection and repair car hook is fixed, and the turning device is rotated clockwise or counterclockwise to adjust the clearance of the safety mechanism thread pair, wherein the clearance of the safety mechanism thread pair includes the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair;

[0030] Step 12) After the clearance of the thread pair of the safety mechanism is adjusted, repeat steps 8) to 11) until the safety mechanism is raised or lowered to the required position.

[0031] In the preferred solution, the boundary condition of the safety mechanism turning process is that the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair must satisfy | ∣> That is, the absolute value of the difference between the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair shall not be less than or equal to the fixed value; when adjusting the clearance of the safety mechanism thread pair, turn the thread pair clockwise or counterclockwise at a certain angle to correspond to the angle scale on the bidirectional ratchet wrench according to the difference in the clearance of the thread pair.

[0032] This patent can achieve the following beneficial effects:

[0033] The lower rotary support plate of the coupling is provided with a splined ring structure, which is used to engage with the splined ring structure of the upper rotary support plate and then clamped by a clamp, so that the connection is reliable and the disassembly and assembly are convenient.

[0034] The bidirectional ratchet wrench is designed with an angle scale and a position pointer to meet the accuracy requirements and improve the accuracy of the safety mechanism clearance adjustment. The driving device of the present invention adopts a bidirectional ratchet wrench to adjust the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair by switching the ratchet direction.

[0035] The limit plug prevents the two-way ratchet wrench from falling off during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0037] Figure 1 This is an axial development diagram of the present invention;

[0038] Figure 2 The present invention is a lower rotary support plate and an upper rotary support plate connection structure diagram;

[0039] Figure 3 It is a three-dimensional structural diagram of the present invention;

[0040] Figure 4 It is a schematic diagram of the structure of the present invention in use;

[0041] Figure 5 It is a schematic diagram of the safety mechanism structure of the existing ship lift;

[0042] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0043] Figure 7 This is a top view of the ship lift safety mechanism.

[0044] In the figure: coupling 1, lower swing support plate 11, connecting shaft 12, clamp 13, arc-shaped fixed groove plate 13.1, driving device 2, ratchet 21, scale ring plate 22, pointer 23, force rod 24, limit plug 25, upper swing support plate 3, upper guide frame 4, lower guide frame 5, nut column 6, rotating screw 7, upper gap of safety mechanism thread pair 8, lower gap of safety mechanism thread pair 9. DETAILED DESCRIPTION

[0045] Embodiment 1:

[0046] The preferred solution is Figures 1 to 4 As shown, a clearance adjustment device for a ship lift safety mechanism comprises a coupling 1 and a driving device 2, wherein the coupling 1 comprises a lower swivel support plate 11, a connecting shaft 12 and a clamp 13, wherein the lower swivel support plate 11 is coaxially connected with the connecting shaft 12, and the clamp 13 is used to connect the lower swivel support plate 11 with an upper swivel support plate 3 of a driving shaft of the safety mechanism. The driving device 2 is used to drive the connecting shaft 12 to rotate, thereby rotating the upper swivel support plate 3.

[0047] Furthermore, if Figure 2 As shown, the lower rotary support plate 11 is a splined circular ring structure, and the splined circular ring structure is used to engage with the splined circular ring structure of the upper rotary support plate 3.

[0048] Furthermore, if Figure 3 As shown, the clamp 13 includes two arc-shaped fixing groove plates 13.1, and the two arc-shaped fixing groove plates 13.1 are detachably connected.

[0049] Furthermore, one end of the two arc-shaped fixed slot plates 13.1 is hinged, and the other end is fixed by bolts. Figure 1 As shown, one end of the two arc-shaped fixed slot plates 13.1 is hinged through a connecting plate, and the other end of the two arc-shaped fixed slot plates 13.1 is provided with a connecting panel, and the connecting panel is provided with bolt holes for installing bolts.

[0050] Furthermore, the inner wall of the arc-shaped fixed groove plate 13.1 is a groove structure. Figure 2 As shown, after the two arc-shaped fixed groove plates 13.1 clamp the lower rotating support plate 11 and the upper rotating support plate 3, the inner wall of the groove of the arc-shaped fixed groove plates 13.1 is used to limit the upper and lower movement of the lower rotating support plate 11 and the upper rotating support plate 3.

[0051] Furthermore, if Figure 2 As shown, the driving device 2 is a bidirectional ratchet wrench, which is used to drive the connecting shaft 12 to rotate.

[0052] Furthermore, the bidirectional ratchet wrench comprises a ratchet 21 , a ring-shaped convex tooth is provided at the center of the ratchet 21 , and a ring-shaped tooth groove is provided at the lower part of the connecting shaft 12 , and the ring-shaped tooth groove matches with the ring-shaped convex tooth.

[0053] Furthermore, the two-way ratchet wrench is provided with a scale ring disk 22 and a pointer 23, the scale ring disk 22 is arranged parallel to and coaxial with the ratchet 21; the scale ring disk 22 is fixedly connected to the ratchet 21, and the pointer 23 is arranged on the housing of the two-way ratchet wrench. Figure 6As shown, the spacing between the upper gap 8 of the safety mechanism thread pair and the lower gap 9 of the safety mechanism thread pair is very small, and the adjustment range of the drive device 2 is very small. Therefore, the scale ring disk 22 and the pointer 23 are used together to facilitate the viewing of the rotation angle of the bidirectional ratchet wrench. The scale ring disk 22 is provided with an angle indicator, which includes a positive angle indicator and a negative angle indicator. When the pointer 23 points to the "0" scale, it proves that the gap of the safety mechanism is most suitable.

[0054] Furthermore, if Figure 1 As shown, the scale ring disk 22 is connected to the ratchet 21 through screws and washers, and a gap is provided between the scale ring disk 22 and the housing of the two-way ratchet wrench; a limit plug 25 is provided below the two-way ratchet wrench, and the limit plug 25 is used to connect to the bottom of the connecting shaft 12 through screws, and the limit plug 25 prevents the two-way ratchet wrench from falling off during use. The scale ring disk 22 rotates integrally with the ratchet 21, and the pointer 23 rotates together with the housing of the two-way ratchet wrench. When the two-way ratchet wrench rotates in the opposite direction, the ratchet 21 and the scale ring disk 22 do not rotate, thereby achieving relative rotation between the scale ring disk 22 and the pointer 23.

[0055] Further, the two-way ratchet wrench is detachably provided with a force rod 24. The force rod 24 is connected to the head of the two-way ratchet wrench by a bolt.

[0056] The working principle of the whole device is as follows:

[0057] Remove the universal coupling connected to the upper swing support disc 3, open the clamp 13 of the coupling 1, align and mesh the lower swing support disc 11 with the upper swing support disc 3, clamp the lower swing support disc 11 with the upper swing support disc 3 with the clamp 13, install the force rod 24, and rotate the two-way ratchet wrench according to the direction of the safety mechanism clearance adjustment to adjust the upper clearance 8 of the safety mechanism thread pair and the lower clearance 9 of the safety mechanism thread pair to achieve the purpose of adjusting the safety mechanism clearance. After the adjustment is completed, remove the force rod 24 and then loosen the clamp 13. Reinstall the universal coupling, and the safety mechanism clearance adjustment is completed.

[0058] Embodiment 2:

[0059] In a preferred embodiment, the method for adjusting the clearance of the ship lift safety mechanism comprises the following steps:

[0060] Step 1) Disconnect the connection between the reducer and the synchronous shaft at the driving point where the cabin attitude needs to be adjusted, adjust the cabin attitude to a horizontal level, and reinstall the synchronous shaft;

[0061] Step 2), respectively measure the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair to determine the clearance adjustment direction;

[0062] Step 3), remove the safety mechanism driving universal coupling, align and engage the lower slewing support plate 11 of the safety mechanism turning device with the upper slewing support plate 3, and clamp the lower slewing support plate 11 and the upper slewing support plate 3 with the clamp 13;

[0063] Step 4), using the device to rotate the safety mechanism clockwise or counterclockwise, wherein when rotating clockwise, the upper clearance of the safety mechanism thread pair becomes larger, and the lower clearance of the safety mechanism thread pair becomes smaller, and when rotating counterclockwise, the upper clearance of the safety mechanism thread pair becomes smaller, and the lower clearance of the safety mechanism thread pair becomes larger;

[0064] Step 5) Measure the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair, and compare the clearance values. If ∣≤Δd0, then the gap adjustment is completed. If ∣ ∣>Δd0, then repeat step 4) until ∣ ∣≤Δd0, gap adjustment is completed;

[0065] Step 6) Reinstall the safety mechanism drive universal coupling and resume operation.

[0066] Furthermore, the rotation angle when the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair are adjusted is ,in is the turning angle of the turning device, is the rotation angle of the rotating screw.

[0067] Embodiment 3:

[0068] like Figures 5 to 7 As shown in the figure, the long nut-short screw type safety mechanism is a type of safety mechanism for the ship lift. During the lifting process of the cabin, the rotating screw rises and falls synchronously with the pinion of the driving mechanism, and the screw thread does not contact the thread surface of the nut column. During installation, there is a certain gap between the two in both the upper and lower directions, that is, there is an upper gap of the safety mechanism thread pair and a lower gap of the safety mechanism thread pair. The full balance state of the cabin is destroyed, causing the clearance of the safety mechanism thread pair to become smaller until the clearance disappears completely. The unbalanced load of the cabin is transmitted to the nut column through the screw, preventing catastrophic accidents caused by the destruction of the full balance of the ship lift.

[0069] The currently known safety mechanism installation methods are mainly aimed at the construction of large-stroke lifting and lowering of safety mechanisms, and insufficient consideration is given to the small-stroke turning and high-precision gap adjustment of safety mechanisms, which cannot fully meet the requirements of safety mechanism inspection, disassembly, and daily high-precision gap adjustment. The tooling used in the installation of the ship lift safety mechanism is a short screw with a plurality of rollers arranged in an ascending spiral line on the outer wall, which are in contact with the spiral track surface of the nut column. The safety mechanism is lowered by its own weight. When the safety mechanism falls to about 2 meters to 2.5 meters close to the installation position, the tooling needs to be removed and manually turned to the installation position. The current manual turning has the problems of complex procedures, time-consuming and labor-intensive, and insufficient safety.

[0070] In a preferred embodiment, the ship lift safety mechanism turning method uses the ship lift safety mechanism clearance adjustment device as a turning device, and comprises the following steps:

[0071] Step 1), the cabin is parked at the maintenance position, and the counterweight frame is supported by a steel beam for maintenance;

[0072] Step 2), execute the cabin drainage process, connect the drainage pipeline, open the valve, and drain the cabin water;

[0073] Step 3), remove the safety mechanism rotary joint and the hydraulic pipeline connected to it;

[0074] Step 4) Install a limit device between the support rod of the safety mechanism and the inner hole at the lower end of the rotating screw to fix the support rod in a vertical state;

[0075] Step 5), remove the ball joint screw connecting the safety mechanism support rod and the cabin safety beam flange, so that the ball joint is disengaged from the safety beam flange;

[0076] Step 6), remove the safety mechanism driving universal coupling, align and engage the lower slewing support plate 11 of the safety mechanism turning device with the upper slewing support plate 3, and clamp the lower slewing support plate 11 and the upper slewing support plate 3 with the clamp 13;

[0077] Step 7) Install a lifting ring on the lifting hole of the guide frame 4 on the safety mechanism, and connect the top machine room inspection car hook to the lifting ring through the lifting wire rope;

[0078] Step 8) Determine whether the safety mechanism needs to be lifted or lowered, and then adjust the driving direction of the drive device 2; turn the reversing button of the two-way ratchet wrench in the turning device of the safety mechanism, clockwise turning for lowering, and counterclockwise turning for rising;

[0079] Step 9: The maintenance vehicle controls the safety mechanism to slowly rise and fall, and at the same time, the safety mechanism is rotated synchronously through the turning device;

[0080] Step 10. Observe and measure the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair. If ∣≥ , that is, the absolute value of the difference between the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair shall not be less than or equal to the fixed value, then the maintenance car and the turning device will stop at the same time;

[0081] Step 11, judging whether to turn the car clockwise or counterclockwise according to the measured values ​​of the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair, the inspection and repair car hook is fixed, and the turning device is rotated clockwise or counterclockwise to adjust the clearance of the safety mechanism thread pair, wherein the clearance of the safety mechanism thread pair includes the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair;

[0082] Step 12: After the thread pair clearance of the safety mechanism is adjusted, repeat steps 8 to 11 until the safety mechanism is raised or lowered to the required position.

[0083] By using this safety mechanism turning method, the construction workload can be greatly reduced, manpower can be saved, and the safety of disassembly, assembly and maintenance of the ship lift safety mechanism can be improved through simple operation and installation methods. This method can realize the small-stroke lifting or lowering of the safety mechanism, complete the installation and disassembly of the large-stroke lifting construction tooling of the safety mechanism, and enable the safety mechanism to be accurately installed in place.

[0084] Furthermore, the boundary conditions of the safety mechanism turning process are that the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair must satisfy if | ∣> , that is, the absolute value of the difference between the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair shall not be less than or equal to the fixed value; when adjusting the clearance of the safety mechanism thread pair, turn the screw clockwise or counterclockwise at a certain angle to correspond to the angle scale on the bidirectional ratchet wrench according to the difference in the clearance of the thread pair. The clearance difference between the upper clearance of the safety mechanism thread pair and the lower clearance of the safety mechanism thread pair can be accurately adjusted. The clearance of the safety mechanism thread pair can be measured with a steel ruler or a vernier caliper.

[0085] In this technical solution, during the turning process, if Figures 5 to 7As shown, taking the Three Gorges ship lift safety mechanism as an example, the rotating screw 7 has a height of 2385mm and an effective thread height of 1800mm. The upper end of the rotating screw 7 is connected to the upper guide frame 4, and the lower end is connected to the pinion and the lower guide frame 5. The top of the rotating screw 7 is connected to the docking locking mechanism of the cabin, and the internal blind hole is equipped with a thrust spherical bearing; the surface of the rotating screw of the safety mechanism is provided with an Archimedean spiral, and the equivalent friction angle of the spiral surface meets the self-locking condition. During the lifting and lowering process of the cabin, the rotating screw rises and falls synchronously with the pinion of the driving mechanism, and the screw thread does not contact the thread surface of the nut column. During installation, there is a gap of 60mm between the two in both the upper and lower directions. The safety mechanism is required to be raised to a certain height by turning the wheel at the cabin installation position, and finally the safety mechanism is removed from the nut column. After the relevant parts are repaired, the safety mechanism is lowered to the turning height, and finally the safety mechanism is installed in place with a turning device.

[0086] During the installation of the winch device, remove the universal coupling connected to the upper rotating support plate 3, open the clamp 13 of the coupling 1, align and engage the lower rotating support plate 11 with the upper rotating support plate 3, clamp the lower rotating support plate 11 and the upper rotating support plate 3 with the clamp 13, and install the force rod 24.

Claims

1. A clearance adjustment device for a ship lift safety mechanism, comprising a coupling (1) and a drive device (2), characterized in that: The coupling (1) comprises a lower swiveling support plate (11), a connecting shaft (12) and a clamp (13); the lower swiveling support plate (11) is coaxially connected to the connecting shaft (12); and the clamp (13) is used to connect the lower swiveling support plate (11) to an upper swiveling support plate (3) of a driving shaft of a safety mechanism; The lower rotating support plate (11) is a splined circular ring structure, and the splined circular ring structure is used to mesh with the splined circular ring structure of the upper rotating support plate (3); The hoop (13) comprises two arc-shaped fixed groove plates (13.1), which are detachably connected to each other; one end of the two arc-shaped fixed groove plates (13.1) is hinged, and the other end is fixed by bolts; the inner wall of the arc-shaped fixed groove plates (13.1) is a groove structure; The driving device (2) is a bidirectional ratchet wrench, which is used to drive the connecting shaft (12) to rotate; the bidirectional ratchet wrench comprises a ratchet (21), the center of the ratchet (21) is provided with an annular convex tooth, and the lower part of the connecting shaft (12) is provided with an annular tooth groove, and the annular tooth groove cooperates with the annular convex tooth; The bidirectional ratchet wrench is provided with a graduated ring disk (22) and a pointer (23), the graduated ring disk (22) and the ratchet (21) being arranged in parallel and coaxially; the graduated ring disk (22) and the ratchet (21) are fixedly connected, and the pointer (23) is arranged on the housing of the bidirectional ratchet wrench; the graduated ring disk (22) is connected to the ratchet (21) via screws and gaskets, and a gap is provided between the graduated ring disk (22) and the housing of the bidirectional ratchet wrench; a limit plug (25) is provided at the bottom of the bidirectional ratchet wrench, and the limit plug (25) is used to be connected to the bottom of the connecting shaft (12) via screws.

2. The clearance adjustment device for the ship lift safety mechanism according to claim 1, characterized in that: The bidirectional ratchet wrench is detachably provided with a force adding rod (24).

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