A movable rack auxiliary gear hobbing device and a movable hatch cover

Abstract

The application relates to a movable rack auxiliary gear shifting device and a movable hatch cover, which comprises a rotating pinion, a fixed base and a rotating device; the rotating pinion is connected with the fixed base through the rotating device and can rotate around the rotating device, and the fixed base is arranged at the rear end of the terminal tooth shape of the movable rack; the rotating pinion has a first position state and a second position state; in the first position state, the rotating pinion is covered on the rotating device, and the height of the rotating pinion is smaller than the height of the terminal tooth shape of the movable rack; in the second position state, the free end of the rotating pinion is separated from the rotating device; and the rotating device can make the rotating pinion return to the first position state from the second position state. When the movable rack slightly retreats due to the deformation of a ship body or external force disturbance, the rotating pinion can avoid the collision and friction between the gear and the terminal tooth shape of the movable rack, the motion interference problem in the transition of the hatch cover from the heaving state to the lateral moving state is solved, the normal opening and closing of the hatch cover is ensured, and the operation of the hatch cover is more stable.

Description

Technical Field

[0001] This application relates to the field of marine technology, specifically to a movable rack-assisted gear-rotating device and a movable hatch cover. Background Technology

[0002] In marine hatch cover systems, integrated electric side-sliding hatch covers achieve both lifting and side-sliding functions through a single power source. They offer advantages such as compact structure and simple control (see CN116927614A for details). This system cleverly utilizes the characteristics of the motor, outputting high torque at low speeds to drive a movable rack via gears, which in turn drives the lever-type lifting arm to complete the hatch cover lifting operation. At high speeds, the same motor rapidly drives the gears and hatch cover rack to achieve the hatch cover side-sliding operation. The most critical technology lies in the smooth transition of the output gear from the lifting state to the side-sliding state, which requires special consideration of the positional coordination of the two operating mechanisms.

[0003] The conventional coordination scheme is that during the heave and sag phase, the gear drives the movable rack until its head is embedded in the docking structure welded to the hatch coaming to achieve limit fixation. At this time, the gear and the movable rack are in a zero-contact state. At the same time, the gear meshes with the rack of the opposite hatch cover, pushing the hatch cover to perform a translation operation. During the translation operation of the hatch cover, the gear and the movable rack must be kept in a stable disengaged state.

[0004] In actual operation, due to hull deformation or external disturbances, the movable rack may slightly retract or even detach from the docking structure, resulting in its end teeth not completely exiting the gear's range of motion. If the gear then begins to rotate in the opposite direction to perform a translation operation, the gear profile may rub against the remaining end teeth on the movable rack, causing motion interference, affecting the normal opening and closing of the hatch, and in severe cases, even causing equipment damage. The existing structure lacks a fault-tolerant mechanism for this minute displacement, making it difficult to guarantee long-term reliability under complex operating conditions. Utility Model Content

[0005] The purpose of this application is to provide a movable rack-assisted gear rotation device and a movable hatch cover to solve the motion interference problem of the hatch cover transitioning from a heave state to a lateral movement state.

[0006] To achieve the above objectives, according to one aspect of this application, a movable rack-assisted gear rotation device is provided, comprising a rotating pinion, a fixed base, and a rotation device;

[0007] The rotating small tooth is connected to the fixed base through a rotary device and can rotate around the rotary device. The fixed base is located at the rear end of the end tooth of the movable rack.

[0008] The rotating small tooth has a first position state and a second position state. In the first position state, the rotating small tooth covers the rotary device, and the height of the rotating small tooth is less than the height of the end tooth of the movable rack. In the second position state, the free end of the rotating small tooth is separated from the rotary device. The rotary device can return the rotating small tooth from the second position state to the first position state.

[0009] Preferably, the fixed base is U-shaped, with the open end of the U-shape connected to the rotating device, and small rotating teeth are provided inside the U-shaped opening. The fixed base is connected to the rear end of the end tooth of the movable rack through fasteners.

[0010] Preferably, the rotary device includes a pin and a rotary spring;

[0011] The pin passes through the U-shaped opening of the fixed base and is fastened to the fixed base. The rotary spring is sleeved on the pin, and the two lever arms of the rotary spring are respectively connected to the fixed base and the rotating small tooth.

[0012] Preferably, the rotating small tooth is arched, covers the pin of the rotary device, and is able to rotate relative to the pin of the rotary device.

[0013] Preferably, the tooth profile of the rotating pinion is the same as that of the movable rack.

[0014] Preferably, the rotating small tooth is further provided with a rotating shaft, the rotating small tooth rotates around the rotating shaft as the axis, and the axis of the rotating shaft is parallel to the rotation axis of the rotary device and at the same height.

[0015] Preferably, there are two rotary springs, which are respectively arranged on both sides of the rotary small tooth.

[0016] According to another aspect of this application, a movable hatch cover is provided, including a hatch cover, a translation mechanism, a lifting mechanism, and a movable rack auxiliary gear rotation device. The translation mechanism includes a gear and rack mechanism, which includes a gear and a movable rack. The movable rack auxiliary gear rotation device is installed at the rear end of the end tooth profile of the movable rack. Rotating the pinion can move from a first position state to a second position state under the action of the gear.

[0017] Preferably, it also includes a hatch coaming docking structure, which can limit the rack head end of the movable rack when it engages with the rack head end of the movable rack.

[0018] Preferably, the gear includes a first gear tooth profile and a second gear tooth profile. When the first gear tooth profile disengages from the end tooth profile of the movable rack, the second gear tooth profile interacts with the rotating pinion, pushing the rotating pinion to rotate and causing the movable rack to continue moving a set distance.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] 1. This application provides a small rotating tooth at the rear end of the toothed end of the movable rack that can automatically reset. When the hull is deformed or external forces cause the movable rack to retract slightly, the small rotating tooth can prevent the gear from rubbing against the toothed end of the movable rack. This solves the motion interference problem of the hatch transitioning from a heave state to a lateral shift state, ensuring that the hatch can open and close normally and making its operation more stable.

[0021] 2. This application adopts a structure in which a rotating pinion tooth and a slewing device cooperate. In the first position, the height of the rotating pinion tooth is less than the height of the tooth profile at the end of the movable rack, making it difficult for the gear and the rotating pinion tooth to mesh. Even if the movable rack retracts to a position where the rotating pinion tooth can mesh with the gear, under the action of the slewing device, if the gear rotates clockwise, it will push the rotating pinion tooth to rotate counterclockwise, causing the movable rack to move towards the front end and engage with the hatch coaming docking structure, thereby maintaining the disengagement of the movable rack from the gear. If the gear rotates counterclockwise, it will push the rotating pinion tooth to rotate clockwise around the slewing device. The slewing device absorbs the force of the gear rotation, preventing the movable rack from moving towards the rear end, thus avoiding interference. This greatly improves the fault tolerance mechanism for small displacements and enhances the reliability of the hatch cover system under complex operating conditions during long-term operation. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of this application from one angle;

[0023] Figure 2 This is a structural diagram from another angle of this application;

[0024] Figure 3 This is a structural diagram of the usage status of this application;

[0025] Figure 4 yes Figure 3 Enlarged view of part A in the middle.

[0026] In the picture:

[0027] 1- Rotating small tooth; 2- Rotating shaft; 3- Pin; 4- Fixed base; 5- Rotation spring; 6- Fastener; 7- Movable rack; 8- End tooth profile; 9- Rack head; 10- Gear; 11- First gear tooth profile; 12- Second gear tooth profile; 13- Hatch coaming docking structure; 100- Movable rack auxiliary gear rotating device. Detailed Implementation

[0028] The present application will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present application. These all fall within the protection scope of the present application.

[0029] Example 1:

[0030] A movable rack-assisted gear rotation device, such as Figure 1-2 As shown, it includes a rotating small tooth 1, a fixed base 4, and a rotating device; the rotating small tooth 1 is connected to the fixed base 4 through the rotating device and can rotate around the rotating device; the fixed base 4 is located at the rear end of the end tooth 8 of the movable rack 7; the rotating small tooth 1 has a first position state and a second position state; in the first position state, the rotating small tooth 1 covers the rotating device, and the height of the rotating small tooth 1 is less than the height of the end tooth 8 of the movable rack 7; in the second position state, the free end of the rotating small tooth 1 is separated from the rotating device; the rotating device can return the rotating small tooth 1 from the second position state to the first position state.

[0031] During the operation of ship hatch covers, the drive system needs to smoothly switch between heave and lateral movement. In traditional structures, a movable rack drives the hatch cover to rise via gears, with its proximal end engaging the hatch coaming structure for positioning. Subsequently, the gear disengages from the end teeth of the movable rack, entering the translation phase. However, when the hatch coaming deforms or is disturbed by external forces, the movable rack may slightly retract, causing its end teeth to re-enter the gear's rotation path, resulting in friction between the gear and the teeth, affecting the reliability of hatch opening and closing. This problem is particularly prominent under conditions of limited installation space and high-precision fit requirements, necessitating an auxiliary device that can effectively absorb the risk of motion interference without increasing additional layout space.

[0032] This embodiment provides a movable rack auxiliary gear rotation device suitable for a rack-and-pinion driven mobile hatch cover system, aiming to solve the gear collision problem caused by slight retraction of the movable rack during the translation preparation stage. This device, by incorporating a rotatable small rotating tooth 1 with automatic reset capability, forms a flexible response mechanism to abnormal displacement without affecting the original transmission logic, thereby ensuring smooth rotation of the gear 10 and improving the stability and safety of the system operation.

[0033] The rotating pinion 1 is a key component used for temporary contact with the drive gear 10 and for transmitting force. Its structure is a mechanical tooth body with a standard tooth profile, capable of momentary meshing or contour contact with a portion of the gear 10's teeth. The rotating pinion 1 is installed behind the end tooth profile 8 of the movable rack 7, specifically at the tail end along the extension direction of the movable rack 7, ensuring it is on the potential interference path after the gear 10 disengages from the end tooth profile 8 of the movable rack 7. The rotating pinion 1 can rotate around the axis of the rotary device under external driving force, entering a second position state, or return to the first position state relying on the elastic restoring force of the rotary device after the driving force disappears. In the first position state, the overall height of the rotating pinion 1 is lower than the end tooth profile 8 of the movable rack 7, ensuring its top profile completely avoids the rotational outer diameter of the gear 10, preventing unnecessary contact or resistance. This low-profile design ensures the interference-free characteristics of the device in the non-operating state, improving the system's safety margin. When the hull deformation or external disturbance causes the movable rack 7 to retract slightly, even if the movable rack retracts to a position where the rotating pinion can mesh with the gear, under the action of the slewing device, if the gear rotates clockwise, it will push the rotating pinion to rotate counterclockwise, causing the movable rack to move to the front end and engage with the hatch coaming docking structure, thus keeping the movable rack disengaged from the gear; if the gear rotates counterclockwise, it will push the rotating pinion to rotate clockwise around the slewing device. The slewing device absorbs the force of the gear rotation, preventing the movable rack from moving to the rear end, thereby avoiding interference, greatly improving the fault tolerance mechanism for small displacements, and improving the reliability of the hatch cover system under complex operating conditions for long-term operation.

[0034] The fixed base 4 serves as the basic support structure for the entire auxiliary device, used to stably fix the rotating pinion 1 and the rotary device to the movable rack 7. Its position is located at the rear end of the end tooth profile 8, which neither hinders the functional integrity of the movable rack 7 nor prevents insufficient installation space for the rotating pinion 1. The fixed base 4 not only bears the load transmission function but also serves as the anchoring base for the rotary device, ensuring stability during rotation.

[0035] The rotary device is the core component for realizing the unidirectional yielding and automatic reset of the rotating small tooth 1. Its function is to allow the rotating small tooth 1 to rotate under the push of external force, and to drive it to return to its initial posture after the force source is removed. The rotary device has elastic energy storage and release capabilities, and can store deformation energy when the rotating small tooth 1 is rotated under pressure, and release the energy to complete the reset action after the load is removed.

[0036] Example 2:

[0037] This embodiment is an improvement based on Embodiment 1, specifically the following improvements: Figure 2As shown, the fixed base 4 is U-shaped, with the open end of the U-shape connected to the rotating device. A small rotating tooth 1 is provided inside the U-shaped opening. The fixed base 4 is connected to the rear end of the end tooth 8 of the movable rack 7 via a fastener 6. The rotating device includes a pin 3 and a rotating spring 5. The pin 3 passes through the U-shaped opening of the fixed base 4 and is fastened to the fixed base 4. The rotating spring 5 is sleeved on the pin 3, and the two lever arms of the rotating spring 5 are respectively connected to the fixed base 4 and the small rotating tooth 1.

[0038] The fixed base 4 adopts a U-shaped structure, whose overall outline is formed by parallel support arms on both sides and a bottom connecting section, creating a frame structure with a cross-section approximately "U". The internal space of the U-shaped structure accommodates the rotating small tooth 1, confining it within the U-shaped cavity during movement, preventing lateral displacement or jamming, and improving the guidance and stability during rotation. The external dimensions of the fixed base 4 are designed to fit the available installation space behind the tooth shape 8 at the end of the movable rack 7. Typically, the width is slightly larger than the axial length of the rotating small tooth 1 to ensure sufficient clearance on both sides for spring installation and movement avoidance; the height ensures that it covers the main rotation area of ​​the rotating small tooth 1 and provides sufficient connection strength.

[0039] The fixed base 4 is connected to the rear end of the end tooth profile 8 of the movable rack 7 via fasteners 6. These fasteners 6 can be countersunk screws, hex socket head cap screws, or other low-profile fastening elements, with their heads fully embedded in the pre-set mounting holes of the fixed base 4 or the movable rack 7, avoiding protrusion from the rack surface and interference with the meshing path of the gear 10. The connection position is located in a flat area after the end tooth profile 8, ensuring good flatness and load-bearing capacity of the connection surface. Multiple fasteners 6 are distributed laterally, in at least two sets, to evenly distribute the load and prevent localized stress concentration that could lead to loosening or fatigue fracture. This connection method abandons traditional welding processes, employing mechanical fastening to achieve modular installation and disassembly of the device. During on-site commissioning or maintenance, the fixed base 4 and its integrated components can be removed as a whole by loosening the fasteners 6, facilitating cleaning, inspection, or replacement of worn parts, significantly improving the maintainability of the equipment. Furthermore, the mechanical connection allows for fine-tuning of the position of the fixed base 4 during assembly to compensate for manufacturing tolerances or installation deviations, ensuring precise matching of the relative positions between the rotating pinion 1 and the gear 10.

[0040] Pin 3, as the core supporting component for the rotational motion of the small gear 1, passes through the U-shaped opening end of the fixed base 4 and forms a rigid connection with the fixed base 4 through interference fit, welding, or threaded fastening to ensure the stability of the overall structure. The axial direction of pin 3 defines the rotation center line of the small gear 1, and its positional accuracy directly affects the consistency of the motion trajectory of the small gear 1.

[0041] The rotary spring 5 is a torsion spring structure, sleeved on the pin 3 and located between the fixed base 4 and the rotating pinion 1. Its two lever arms are fixedly connected to the fixed base 4 and the rotating pinion 1 respectively, providing pre-tightening restoring force. Under normal conditions, the rotary spring 5 is in a slightly pre-deformed state, applying a continuous torsional elastic force to keep the rotating pinion 1 in the first position, i.e., its height is lower than the height of the tooth profile 8 at the end of the movable rack 7, avoiding interference with the gear 10. When the gear 10 pushes the rotating pinion 1 to rotate from the first position to the second position, the rotary spring 5 undergoes elastic torsional deformation, storing potential energy. Once the gear 10 disengages, the external force disappears, the rotary spring 5 releases energy, driving the rotating pinion 1 to rotate in the opposite direction and accurately return to the first position. The spring coefficient of the rotary spring 5 needs to be matched and designed according to the actual load conditions, ensuring sufficient restoring force to overcome environmental vibrations or minor jamming, but not too large to avoid affecting the opening sensitivity. For example, there are two rotary springs 5, respectively arranged on both sides of the rotating pinion 1. The simultaneous deformation and energy release of the two rotating springs 5 ​​ensures a uniform torque distribution on the rotating small tooth 1, avoiding the off-center load phenomenon caused by unilateral force.

[0042] Example 3:

[0043] This embodiment is an improvement based on Embodiment 1 or Embodiment 2. The specific improvement is that the rotating small tooth 1 is arched, covers the pin 3 of the rotating device, and can rotate relative to the pin 3 of the rotating device. The tooth profile of the rotating small tooth 1 is the same as the tooth profile of the movable rack 7.

[0044] The arched structure refers to the overall arc-shaped shell shape of the rotating gear 1, with its inner surface forming an arc contour that matches the outer circumference of the pin 3 of the rotating device, allowing the rotating gear 1 to rotate relative to the pin 3 as the center of rotation. The rotating gear 1 is directly fitted onto the pin 3 through its internal arched structure, forming a hinged connection that allows free rotation around the pin. The pin 3, as a fixed shaft, passes through the U-shaped opening end of the fixed base 4 and is tightly connected to it, forming the fulcrum of rotation. During the rotation of the rotating gear 1 around the pin 3, it is always subject to radial constraint between the arched structure and the pin, effectively preventing disengagement, displacement, or jamming caused by vibration or lateral forces. At the same time, this covering structure increases the contact area and reduces the contact stress per unit area, which helps to extend the service life.

[0045] The tooth profile of the rotating pinion 1 is identical to that of the movable rack 7, meaning that the two have a high degree of consistency in geometric parameters, including but not limited to key tooth profile elements such as module, pressure angle, addendum coefficient, dedendum coefficient, tooth width, and tooth profile curve shape. This design allows the rotating pinion 1 to be functionally regarded as an extension of the tooth profile structure of the movable rack 7. Although it is independently positioned after the end of the movable rack 7 in spatial layout, it can still form an equivalent meshing relationship with the drive gear 10 in transmission behavior.

[0046] Example 4:

[0047] This embodiment is largely the same as Embodiment 3, with the main difference being that in Embodiment 3, the small gear 1 rotates around the pin 3 of the rotary device. However, in this embodiment, as... Figure 1 As shown, the rotating small tooth 1 is also provided with a rotating shaft 2. The rotating small tooth 1 rotates around the rotating shaft 2 as an axis. The axis of the rotating shaft 2 is parallel to the rotation axis of the rotary device and is at the same height.

[0048] The rotating shaft 2 is a rigid rod-like structure that runs through one side of the rotating pinion 1. The axis of the rotating shaft 2 is parallel to and at the same height as the rotation axis of the rotary device. This design ensures that the rotation center of the rotating pinion 1 coincides with the plane of action of the driving force, reducing the additional bending moment and eccentric load effect during torque transmission. Because an independent rotating shaft 2 is provided, and its axis is parallel to and at the same height as the rotation axis of the rotary device, the rotating pinion 1 can rotate smoothly when pushed by the gear profile without tilting or wobbling. This structural layout significantly improves the motion coordination during rotation, reduces mechanical wear and jamming risks, and enhances the stability and durability of the device operation.

[0049] Example 5:

[0050] A movable hatch cover includes a hatch cover, a translation mechanism, a lifting mechanism, and the aforementioned movable rack-and-pinion auxiliary gear rotating device 100. The translation mechanism includes a rack and pinion mechanism, such as... Figure 3-4 As shown, the gear and rack mechanism includes a gear 10 and a movable rack 7. An auxiliary gear-rotating device 100 is installed at the rear end of the end tooth profile 8 of the movable rack 7. The rotating pinion 1 can move from a first position to a second position under the action of the gear 10. It also includes a hatch coaming docking structure 13, which, when engaged with the rack tip 9 of the movable rack 7, can limit the movement of the rack tip 9. The gear 10 includes a first gear tooth profile 11 and a second gear tooth profile 12. When the first gear tooth profile 11 disengages from the end tooth profile 8 of the movable rack 7, the second gear tooth profile 12 interacts with the rotating pinion 1, pushing the rotating pinion 1 to rotate and causing the movable rack 7 to continue moving a set distance.

[0051] During the hatch lifting phase, gear 10 rotates clockwise and engages to move the movable rack 7 until the first gear tooth 11 of gear 10 reaches zero contact with the end tooth 8 of the movable rack 7. Subsequently, the next adjacent second tooth 12 of gear 10 continues to engage and push the movable pinion 1, causing the entire movable rack 7 to continue forward beyond a certain distance (e.g., 10 mm) until the rack tip 9 of the movable rack 7 is embedded in the hatch coaming docking structure 13 welded to the hatch coaming and fixed in place. At this point, the end tooth 8 of the movable rack 7 disengages from the outer contour line of gear 10. After the hatch is lifted and during the hatch sliding closure process, gear 10 rotates counterclockwise and engages to push the hatch rack to achieve the sliding closure operation. During this process, the movable rack 7 remains disengaged from gear 10 to ensure smooth sliding closure of the hatch. Even if external factors cause the movable rack 7 to retract slightly (within 10 mm), when the hatch is closed and the gear 10 rotates counterclockwise, the outer contour of the gear 10 coincides with the rotating pinion 1, thus pushing the rotating pinion 1 to rotate clockwise in the first position. The rotation device (rotation spring 5) absorbs the thrust of the gear 10, and the movable rack 7 does not move to the rear end. When the teeth of the gear 10 move away, the rotating pinion 1 returns to the first position under the action of the rotation device (rotation spring 5), and this process repeats. The force of the gear 10 pushing the rotating pinion 1 is much less than the friction and fixing force of the movable rack 7, and is insufficient to cause the movable rack to retract further. After the hatch is raised and during the hatch sliding opening process, the gear 10 rotates clockwise. At this time, the end teeth 8 of the movable rack 7 disengage from the outer contour of the gear 10. External factors cause the movable rack 7 to retract slightly, and the gear 10 will mesh and push the movable pinion 1, causing the entire movable rack 7 to continue to move forward for more than a certain distance (e.g., 10 mm) until the rack tip 9 of the movable rack 7 is embedded in the hatch coaming docking structure 13 welded to the hatch coaming and fixed in place.

[0052] This embodiment proposes a mobile hatch cover system integrating a movable rack-assisted gear rotation device. By introducing the aforementioned auxiliary device into the hatch cover drive system, active control and fault-tolerant protection are achieved for the disengagement process of the movable rack end. This solution significantly improves the system's operational stability and operational switching reliability under complex conditions without altering the original lifting and translational motion logic, making it particularly suitable for marine engineering equipment scenarios where the hull structure is prone to deformation.

[0053] In this application, the use of directional terms such as "up," "down," "left," "right," "bottom," and "top" is defined relative to the directions shown in the accompanying drawings and is used only to indicate relative positional relationships. These relative positional relationships may change accordingly when the absolute position of the described object changes. These or other directional terms should not be construed as restrictive.

[0054] The use of terms such as "a," "an," "a kind," and "the" in this application does not indicate a quantity limitation and may indicate a singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this application are intended to cover non-exclusive inclusion; the terms "first," "second," and "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific ordering of objects.

[0055] In this application, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may not be directly connected to the other devices but may have an intermediary device.

[0056] Furthermore, this application does not discuss in detail the technologies and equipment known to those skilled in the art, but where appropriate, such technologies and equipment should be considered part of the specification.

[0057] The specific embodiments of this application have been described above. It should be understood that this application is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this application. Unless otherwise specified, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other.

Claims

1. A movable rack-assisted gear-rotating device, characterized in that, It includes a rotating small tooth (1), a fixed base (4), and a rotating device; The rotating small tooth (1) is connected to the fixed base (4) through the rotary device and can rotate around the rotary device. The fixed base (4) is located at the rear end of the end tooth (8) of the movable rack (7). The rotating small tooth (1) has a first position state and a second position state. In the first position state, the rotating small tooth (1) covers the rotary device, and the height of the rotating small tooth (1) is less than the height of the end tooth profile (8) of the movable rack (7). In the second position state, the free end of the rotating small tooth (1) is separated from the rotary device. The rotary device can make the rotating small tooth (1) return from the second position state to the first position state.

2. The movable rack-assisted gear-rotating device according to claim 1, characterized in that, The fixed base (4) is U-shaped, with the open end of the U-shape connected to the rotary device. Rotating small teeth (1) are provided inside the U-shaped opening. The fixed base (4) is connected to the rear end of the end tooth (8) of the movable rack (7) through fasteners (6).

3. The movable rack-assisted gear-rotating device according to claim 1 or 2, characterized in that, The rotary device includes a pin (3) and a rotary spring (5); The pin (3) passes through the U-shaped opening end of the fixed base (4) and is fastened to the fixed base (4). The rotary spring (5) is sleeved on the pin (3). The two lever arms of the rotary spring (5) are respectively connected to the fixed base (4) and the rotating small tooth (1).

4. The movable rack-assisted gear-rotating device according to claim 1 or 3, characterized in that, The rotating small tooth (1) is arched, covers the pin (3) of the rotary device, and can rotate relative to the pin (3) of the rotary device.

5. The movable rack-assisted gear-rotating device according to claim 1, characterized in that, The tooth profile of the rotating small tooth (1) is the same as that of the movable rack (7).

6. The movable rack-assisted gear-rotating device according to claim 1, characterized in that, The rotating small tooth (1) is also provided with a rotating shaft (2). The rotating small tooth (1) rotates around the rotating shaft (2). The axis of the rotating shaft (2) is parallel to the rotation axis of the rotary device and is at the same height.

7. The movable rack-assisted gear-rotating device according to claim 3, characterized in that, There are two rotary springs (5), which are respectively set on both sides of the rotary small tooth (1).

8. A movable hatch cover, comprising a hatch cover, a translation mechanism, and a lifting mechanism, characterized in that, It also includes the movable rack-assisted gear-rotating device (100) according to any one of claims 1-7, wherein the translation mechanism includes a gear rack mechanism, the gear rack mechanism includes a gear (10) and a movable rack (7), the movable rack-assisted gear-rotating device (100) is installed at the rear end of the end tooth profile (8) of the movable rack (7), and the rotating pinion (1) can move from the first position state to the second position state under the action of the gear (10).

9. The movable hatch cover according to claim 8, characterized in that, It also includes a hatch coaming docking structure (13), which can limit the rack head (9) of the movable rack (7) when it is engaged with the rack head (9) of the movable rack (7).

10. The movable hatch cover according to claim 8, characterized in that, The gear (10) includes a first gear tooth profile (11) and a second gear tooth profile (12). When the first gear tooth profile (11) disengages from the end tooth profile (8) of the movable rack (7), the second gear tooth profile (12) interacts with the rotating pinion (1), pushing the rotating pinion (1) to rotate and causing the movable rack (7) to continue moving a set distance.

Images