Lifting device and lifting pool cover

Abstract

The utility model discloses a lifting device and lift swimming pool cover, including swimming pool cover, swimming pool cover is connected with lifting device fixedly, and lifting device includes: fixed sleeve, and set up in fixed sleeve and can along the axial lifting of fixed sleeve main lifting sleeve, and the cavity of main lifting sleeve is fixedly provided with support plate, the top of the cavity of main lifting sleeve is equipped with the drive motor that deceleration box is connected, and deceleration box sets up on support plate, install sleeve, fixed in the bottom surface of support plate, the axial cavity is opened in install sleeve, and the support sleeve that can rotate about its axis is provided in the axial cavity, and the plane bearing is arranged between support plate and support sleeve, and the upper and lower surfaces of plane bearing respectively with support plate and support sleeve abut, the output shaft of deceleration box passes through support plate to the inner hole of plane bearing and is connected with threaded rod along the axial downward, and the bottom end of threaded rod extends downward and is connected with main thread cover, and main thread cover fixedly connected in the bottom of fixed sleeve.

Description

Technical Field

[0001] This utility model relates to the technical field of swimming pool supporting facilities, specifically a lifting device and a lifting pool cover. Background Technology

[0002] The pool cover is used to cover the pool when it is not in use to reduce heat loss and prevent debris from falling in, and it has good heat preservation and cleaning effects.

[0003] Most pool cover lifters nowadays place the motor and gearbox at the bottom of the lifter's inner cavity, or place the motor at the top of the lifter's inner cavity but the gearbox connected to the threaded rod lacks a supporting component to share the vertical load. These two common structural designs mean that the gearbox bearings have to bear most of the vertical load during the lifting process. Long-term use can easily lead to damage to the gears and chains inside the gearbox, affecting the equipment's service life and operational stability.

[0004] Therefore, designing a lifting pool cover that can share the vertical load of the gearbox and extend its service life has become an urgent problem for those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to overcome the problem that the gearbox inside the pool cover lifting column in the prior art needs to bear most of the vertical load during long-term use, which causes the gears and chains inside the gearbox to be easily damaged. This invention provides a lifting device and a lifting pool cover.

[0006] The objective of this utility model is mainly achieved through the following technical solutions: On one hand, this application provides a lifting device, including: A fixed sleeve, and a main lifting sleeve disposed inside the fixed sleeve and capable of moving up and down along the axial direction of the fixed sleeve, wherein a support plate is fixedly disposed inside the cavity of the main lifting sleeve; The gearbox is located at the top of the cavity of the main lifting sleeve. The gearbox is connected to the drive motor and is mounted on the support plate. An installation sleeve is fixed to the bottom surface of the support plate. An axial cavity is provided inside the installation sleeve. A support sleeve that can rotate around its own axis is provided inside the axial cavity. A plane bearing is provided between the support plate and the support sleeve. The upper and lower surfaces of the plane bearing abut against the support plate and the support sleeve, respectively. The threaded rod has its upper end connected to the support sleeve and extends axially upward to the inner hole of the plane bearing. Its lower end is threadedly connected to the main threaded sleeve, which is fixedly connected to the bottom of the fixed sleeve.

[0007] The output shaft of the gearbox extends axially downwards through the support plate and connects to the threaded rod.

[0008] Furthermore, the main lifting sleeve is fixedly connected to the support plate via a support cage. The support cage is located inside the cavity of the main lifting sleeve and surrounds the outside of the drive motor and gearbox. The upper end of the support cage is fixedly connected to the main lifting sleeve, and its lower end is fixedly connected to the support plate.

[0009] Furthermore, the bottom edge of the mounting sleeve extends inward along the circumference of the mounting sleeve to form a limiting ring, and the bottom end of the support sleeve extends inward along the circumference of the support sleeve and bends downward through the circular hole of the limiting ring to form a support sleeve that restricts the axial displacement of the support sleeve.

[0010] Furthermore, the inner hole of the pipe connecting the support sleeve and the threaded rod is a polygonal hole, and the thread on the outer surface of the upper end of the threaded rod is a polygonal thread segment that matches the polygonal hole, with the polygonal external thread segment and the polygonal hole having a clearance fit. The outer surface of the output shaft of the gearbox is provided with a connecting key, and the upper end of the threaded rod is provided with a keyway that is compatible with the output shaft and the connecting key. The output shaft and the connecting key are inserted into the keyway.

[0011] Furthermore, the lifting device also includes a secondary lifting sleeve, which is disposed between the fixed sleeve and the main lifting sleeve, and is slidably connected to the fixed sleeve and the main lifting sleeve respectively.

[0012] Furthermore, the lifting device also includes a secondary threaded sleeve, the outer surface of which is provided with an external thread that matches the internal thread of the main threaded sleeve, and its inner surface is provided with an internal thread that meshes with the external thread of the threaded rod. The auxiliary threaded sleeve is threadedly connected to the main threaded sleeve via an external thread, and the auxiliary threaded sleeve is threadedly connected to the threaded rod via an internal thread.

[0013] Furthermore, a telescopic spring wire electrically connected to the drive motor is also embedded inside the cavity of the main lifting sleeve.

[0014] On the other hand, this application also provides a liftable pool cover, comprising: Pool cover and multiple lifting devices; The pool cover has threaded holes on its side, and the main lifting sleeve of the multiple lifting devices has a column connecting plate on its side. The column connecting plate is bolted to the side of the pool cover.

[0015] Furthermore, a lifting controller is also installed on the side of the pool cover; The drive motors inside the multiple lifting devices are electrically connected to the lifting controller.

[0016] Furthermore, the pool cover is also equipped with an escape window.

[0017] In summary, the present invention has the following advantages compared with the prior art: This application uses a support sleeve as an intermediate connector between the gearbox output shaft and the threaded rod, eliminating the need for the gearbox output bearing to bear the vertical load transmitted by the threaded rod alone. During lifting, most of the vertical load generated by the threaded rod's rotation and axial movement relative to the main threaded sleeve is transmitted along the path of "threaded rod → support sleeve → plane bearing → support plate," and then from the support plate to the main lifting sleeve. This differs from traditional lifting columns where the gearbox output bearing bears most of the vertical load before transmitting it to the main lifting sleeve. This design significantly reduces the vertical load on the output bearing and the gearbox's internal gears and chains, preventing component wear or damage caused by prolonged high loads. It significantly extends the service life of the gearbox and the entire lifting device, while also improving equipment stability and reducing maintenance frequency and costs due to component failures.

[0018] Meanwhile, the mounting sleeve, through its own axial cavity, supports and limits the support sleeve, allowing it to rotate only along its own axis, effectively restricting its radial displacement. The limiting ring at the bottom of the mounting sleeve engages with the support sleeve formed at the bottom of the support sleeve, further limiting the axial displacement of the support sleeve. This dual-limiting structure ensures that the support sleeve maintains a stable posture when transmitting loads and rotating with the output shaft, preventing lateral forces caused by support sleeve misalignment from acting on the gearbox output shaft or threaded rod, further protecting core components, reducing unexpected mechanical losses, and ensuring smooth force transmission. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 A schematic diagram of the lifting device provided in this application; Figure 2 A schematic diagram of the internal components of the main lifting sleeve provided in this application; Figure 3 The structural diagram of the lifting device provided in this application; Figure 4 Exploded view of the internal components of the main lifting sleeve provided in this application; Figure 5 The structural diagram of the internal components of the main lifting sleeve provided in this application; Figure 6 A schematic diagram of the drive motor and gearbox provided in this application; Figure 7 A schematic diagram of the threaded rod provided in this application; Figure 8 This is a schematic diagram of the lifting device and pool cover provided in this application.

[0020] Figure Labels

[0021] 1-Fixed sleeve; 2-Main lifting sleeve; 3-Reduction gearbox; 4-Drive motor; 5-Support plate; 6-Mounting sleeve; 7-Plate bearing; 8-Support sleeve; 9-Output shaft; 10-Threaded rod; 11-Main threaded sleeve; 12-Support cage; 13-Secondary lifting sleeve; 14-Secondary threaded sleeve; 15-Telescopic spring cable; 16-Swimming pool cover; 17-Column connecting plate; 18-Lifting controller; 19-Escape window; 20-Bolt; 21-Male and female connector; 22-Waterproof DC plug; 23-Encoder; 24-Base plate; 25-Connecting key; 26-Keyway. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of this utility model.

[0028] In the following description, suffixes such as "module," "part," "component," or "unit" are used only for the purpose of describing this utility model and have no specific meaning in themselves. Therefore, they can be used in combination.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] Firstly, please refer to the following: Figures 1-5 This application provides a lifting device, specifically including: Fixed sleeve 1, and main lifting sleeve 2 disposed inside the fixed sleeve 1 and capable of rising and falling along the axial direction of the fixed sleeve 1, wherein a support plate 5 is fixedly disposed inside the cavity of the main lifting sleeve 2; A reduction gearbox 3 is located at the top of the cavity of the main lifting sleeve 2. The reduction gearbox 3 is connected to a drive motor 4 and is mounted on the support plate 5. The mounting sleeve 6 is fixed to the bottom surface of the support plate 5. An axial cavity is provided inside the mounting sleeve 6. A support sleeve 8 that can rotate around its own axis is provided inside the axial cavity. A plane bearing 7 is provided between the support plate 5 and the support sleeve 8. The upper and lower surfaces of the plane bearing 7 abut against the support plate 5 and the support sleeve 8, respectively. The threaded rod 10 has its upper end connected to the support sleeve 8 and extends axially upward to pass through the inner hole of the plane bearing 7. Its lower end is threadedly connected to the main threaded sleeve 11, which is fixedly connected to the bottom of the fixed sleeve 1.

[0031] The output shaft 9 of the gearbox 3 extends axially downward through the support plate 5 and connects to the threaded rod 10.

[0032] In this embodiment, after the drive motor 4 starts, it drives the reduction gearbox 3 to operate. The output shaft 9 of the reduction gearbox 3 rotates synchronously and drives the threaded rod 10 to rotate. Because the lower end of the threaded rod 10 is threadedly connected to the main threaded sleeve 11 fixed to the bottom of the fixed sleeve 1, the threaded rod 10 will generate axial lifting displacement when it rotates. This displacement is then transmitted through the support sleeve 8, the plane bearing 7, and the support plate 5 to drive the reduction gearbox 3 and the main lifting sleeve 2 to move synchronously up and down along the axial direction of the fixed sleeve 1. During this process, most of the vertical load generated by the axial movement of the threaded rod 10 is transmitted sequentially through the support sleeve 8 to the plane bearing 7, then through the plane bearing 7 to the support plate 5, and finally through the support plate 5 to the main lifting sleeve 2. This effectively avoids the output shaft 9 of the reduction gearbox 3 bearing excessively high vertical loads alone, which could lead to premature wear of the gears or chains inside the reduction gearbox 3, resulting in increased gear meshing clearance or chain stretching deformation. This optimized load transmission path not only avoids malfunctions such as jamming and abnormal noise during the lifting process, ensuring smooth operation, but also significantly extends the service life of the reduction gearbox 3 and the entire lifting device.

[0033] In this embodiment, the inventors originally planned to use ball bearings of a traditional lifting column instead of planar bearings 7. However, after long-term experimental verification, it was found that because ball bearings abut against the support sleeve 8 and support plate 5 through the outer ring of the bearing, and the rolling elements of the ball bearing have a point contact force structure with the inner and outer rings, in the working scenario of this lifting device, the vertical load transmitted by the threaded rod 10 must be transmitted entirely through the point contact area between the balls and the rings. This contact form will lead to a high concentration of local stress. Even if high load-bearing ball bearings are selected, under long-term high-frequency lifting cycles (especially under full load conditions), Fatigue damage such as pitting and spalling will still quickly appear on the surface of the ball bearings or the raceway of the ring, directly causing obvious abnormal noise and jamming during the lifting process. The subsequent replacement of the ball bearings with the planar bearing 7 has annular contact between the rolling elements and the upper and lower support surfaces, which makes the stress distribution of the planar bearing 7 more uniform and its load-bearing capacity extremely strong compared to the ball bearing. In addition, the planar bearing 7 has a higher tolerance for coaxiality deviation. Even if there is a small assembly deviation, the additional torque can be avoided by the adaptive adjustment of the rolling elements, which fully meets the requirements of long-term stable operation. Therefore, it was finally decided to use the planar bearing 7 to replace the traditional ball bearing.

[0034] In one possible implementation, the main lifting sleeve 2 is fixedly connected to the support plate 5 via a support cage 12. The support cage 12 is located inside the cavity of the main lifting sleeve 2 and surrounds the outside of the drive motor 4 and the reduction gearbox 3. The upper end of the support cage 12 is fixedly connected to the main lifting sleeve 2, and its lower end is fixedly connected to the support plate 5.

[0035] In this embodiment, the support cage 12 is fixedly connected to the main lifting sleeve 2 by welding or bolting. The support cage 12 surrounds the drive motor 4 and the gearbox 3 inside, which can provide physical protection for the drive motor 4 and the gearbox 3 during equipment operation, and prevent slight shaking that may occur in the cavity when the main lifting sleeve 2 is raised or lowered, or accidental contact with other components (such as wires) in the cavity, from causing impact to the drive motor 4 or the gearbox 3.

[0036] Meanwhile, the bottom end of the support cage 12 is fixedly connected to the support plate 5, which helps the support plate 5 to distribute the load it bears and prevents the support plate 5 from deforming due to excessive local stress. Moreover, the cooperative support structure formed by the support cage 12, the main lifting sleeve 2, and the support plate 5 further distributes the vertical load of the gearbox 3 and the drive motor 4, so that most of the vertical load originally borne by the gearbox 3 and the drive motor 4 is distributed to the support cage 12, and then transferred to the main lifting sleeve 2 by the support cage 12. This effectively reduces the structural load on the drive motor 4 and the gearbox 3, and improves their operational stability and service life.

[0037] In one possible implementation, the bottom edge of the mounting sleeve 6 extends inwardly along the circumference of the mounting sleeve 6 to form a limiting ring, and the bottom end of the support sleeve 8 extends inwardly along the circumference of the support sleeve 8 and bends downward through the circular hole of the limiting ring to form a support sleeve that restricts the axial displacement of the support sleeve 8.

[0038] In this embodiment, the limiting ring at the bottom of the mounting sleeve 6 is an integral structure with the mounting sleeve 6, and the size of the circular hole it has is adapted to the outer diameter of the support sleeve formed by the extension and bending of the bottom end of the support sleeve 8. When the support sleeve 8 is installed in the axial cavity of the mounting sleeve 6, due to the limiting effect of the limiting ring, the support sleeve 8 is only allowed to rotate along its own axis, effectively limiting the radial displacement of the support sleeve 8.

[0039] This design ensures that the support sleeve 8 remains in a preset axial position during long-term rotation and bearing vertical loads, without vertical movement. This ensures the coaxiality of the support sleeve 8 with the gearbox output shaft 9 and threaded rod 10, avoiding transmission jamming or component wear caused by coaxiality deviation, ensuring a stable load transmission path, and improving the operational reliability of the lifting device.

[0040] In one possible implementation, the inner hole of the pipe connecting the support sleeve and the threaded rod 10 is a polygonal hole, and the thread on the outer surface of the upper end of the threaded rod 10 is a polygonal thread segment adapted to the polygonal hole, and the polygonal external thread segment is clearance-fitted with the polygonal hole. The outer surface of the output shaft 9 of the gearbox 3 is provided with a connecting key 25, and the upper end of the threaded rod 10 is provided with a keyway 26 that is adapted to the output shaft 9 and the connecting key 25. The output shaft 9 and the connecting key 25 are inserted into the keyway 26.

[0041] In this embodiment, the support sleeve and the threaded rod 10 have a polygonal clearance fit, while the output shaft 9 and the threaded rod 10 are connected by a keyway. When the threaded rod 10 wears, it can be easily removed from the lifting device for replacement without replacing the entire lifting transmission structure, greatly reducing maintenance costs and downtime. Simultaneously, the polygonal clearance fit effectively prevents slippage during torque transmission, improving transmission reliability.

[0042] Furthermore, it should be noted that the support sleeve and the threaded rod 10 are initially connected via a clearance fit; secondly, as... Figure 4 and Figure 5 As shown, the section of the threaded rod 10 connected to the support sleeve has a partial recess to form an annular groove. The support sleeve has bolt holes aligned with the annular groove. The support sleeve 8 is fixedly connected to the threaded rod 10 by bolts 20. In addition, it should be noted that the support sleeve and the threaded rod 10 can also be fixedly connected by common connection methods, including but not limited to welding, key connection, set screw connection, and pin connection. All of the above conventional fixed connection methods are within the protection scope of this application.

[0043] In one possible implementation, the lifting device further includes a secondary lifting sleeve 13, which is disposed between the fixed sleeve 1 and the main lifting sleeve 2, and is slidably connected to the fixed sleeve 1 and the main lifting sleeve 2 respectively.

[0044] In this embodiment, the outer diameter of the auxiliary lifting sleeve 13 is slightly smaller than the inner diameter of the fixed sleeve 1, with a reasonable gap between them, allowing the auxiliary lifting sleeve 13 to slide smoothly along the inner wall of the fixed sleeve 1. At the same time, a slider that fits against the inner wall of the fixed sleeve 1 is provided at the bottom of the outer wall of the auxiliary lifting sleeve 13, while a limiting block that abuts against the slider is provided at the top of the inner wall of the fixed sleeve 1. The limiting block fits against the outer wall of the auxiliary lifting sleeve 13. When the auxiliary lifting sleeve 13 slides upward along the fixed sleeve 1 to its maximum height, the top of the slider will abut against and press the bottom of the limiting block. Through the cooperation of these two, the auxiliary lifting sleeve 13 can be effectively prevented from completely detaching from the fixed sleeve 1. At the same time, there will be no shaking during the entire lifting process, ensuring that the auxiliary lifting sleeve 13 moves within a preset range and maintaining the stability and interconnectivity of the entire structure.

[0045] Similarly, the inner diameter of the auxiliary lifting sleeve 13 is slightly larger than the outer diameter of the main lifting sleeve 2, and a suitable gap is reserved between the two to ensure smooth sliding. The bottom end of the outer wall of the main lifting sleeve 2 is provided with a slider that fits against the inner wall of the auxiliary lifting sleeve 13, and the top end of the inner wall of the auxiliary lifting sleeve 13 is also provided with a corresponding limiting block, which fits against the outer wall of the main lifting sleeve 2.

[0046] In one possible implementation, the lifting device further includes a secondary threaded sleeve 14, the outer surface of which is provided with an external thread that matches the internal thread of the main threaded sleeve 11, and its inner surface is provided with an internal thread that meshes with the external thread of the threaded rod 10. The auxiliary threaded sleeve 14 is threadedly connected to the main threaded sleeve 11 via the external thread, and the auxiliary threaded sleeve 14 is threadedly connected to the threaded rod 10 via the internal thread.

[0047] In this embodiment, the auxiliary threaded sleeve 14 is positioned between the main threaded sleeve 11 and the threaded rod 10. Its external thread fully engages with the internal thread of the main threaded sleeve 11, and its internal thread fully engages with the external thread of the threaded rod 10, forming a segmented threaded transmission structure consisting of the main threaded sleeve 11, the auxiliary threaded sleeve 14, and the threaded rod 10. When the threaded rod 10 rotates, the auxiliary threaded sleeve 14 moves axially under the constraint of the main threaded sleeve 11, while simultaneously assisting the threaded rod 10 in achieving a longer axial displacement.

[0048] This segmented transmission design can achieve a longer axial lifting stroke within a limited overall structural length through multi-stage engagement between the main threaded sleeve 11 and the auxiliary threaded sleeve 14, and between the auxiliary threaded sleeve 14 and the threaded rod 10, significantly improving the lifting range of the device. At the same time, the multi-stage thread engagement disperses the load borne by a single thread segment, reduces the thread wear rate, and further enhances the stability and service life of the transmission system.

[0049] In one possible implementation, a telescopic spring wire 15 electrically connected to the drive motor 4 is also embedded in the cavity of the main lifting sleeve 2.

[0050] When this embodiment is implemented, as follows: Figure 2 and Figure 3 As shown, the telescopic spring wire 15 is located inside the cavity of the main lifting sleeve 2. The support plate 5 has a round hole for the telescopic spring wire 15 to pass through. The wire end at the top of the telescopic spring wire 15 passes through the round hole and is electrically connected to the drive motor 4. It then passes out from the main lifting sleeve 2 and is connected to a male and female connector 21. The male and female connector 21 is electrically connected to the controller that controls the lifting. The wire end at the bottom passes out from the base plate 24 and is connected to a waterproof DC plug 22. The waterproof DC plug 22 is connected to an external power source.

[0051] The telescopic spring wire 15 stretches under its own elasticity, ensuring uninterrupted power supply to the motor. When the main lifting sleeve 2 falls back down, the telescopic spring wire 15 automatically retracts back to its initial state, preventing redundant entanglement in the cavity. This effectively solves the problem of wire breakage caused by frequent stretching and folding in traditional lifting devices, ensuring the continuity and stability of power supply to the drive motor 4, while reducing the frequency of wire maintenance.

[0052] Secondly, please refer to the following: Figures 1-8 This application provides a lifting pool cover 16 based on the above-described lifting device, comprising: Pool cover 16 and multiple lifting devices; The pool cover 16 has a threaded hole on its side, and the main lifting sleeve 2 of the multiple lifting devices has a column connecting plate 17 on its side. The column connecting plate 17 is connected to the side of the pool cover 16 by bolts 20.

[0053] In this embodiment, the number of lifting devices is determined according to the size and shape of the pool (at least 2, usually 4-6, evenly distributed around the pool). Threaded holes adapted to the column connecting plates 17 are made on the side of the pool cover 16. During installation, the column connecting plates 17 of each lifting device are aligned with the threaded holes on the side of the pool cover 16 and fixed with bolts 20 to ensure a firm and secure connection between the lifting device and the pool cover 16.

[0054] In one possible implementation, a lifting controller 18 is also provided on the side of the pool cover 16; The drive motors 4 inside the multiple lifting devices are electrically connected to the lifting controller 18.

[0055] When this embodiment is implemented, as follows: Figure 5 As shown, each drive motor 4 is equipped with an encoder 23. The encoder 23 can collect the rotation angle and speed data of the corresponding drive motor 4 in real time and convert the data into an electrical signal to feed back to the lifting controller 18. The lifting controller 18 compares the feedback data of all drive motors 4. If the angle or speed of a certain motor deviates from that of the other motors, the controller 18 will immediately send an adjustment command to that motor to fine-tune its operating status, ensuring that all drive motors 4 operate synchronously. Ultimately, this achieves smooth and synchronous lifting of the pool cover 16 by multiple lifting devices, avoiding tilting or jamming.

[0056] In one possible implementation, the pool cover 16 is also provided with an escape window 19.

[0057] In this embodiment, the escape window 19 is fastened to a preset position on the pool cover 16 via a hinge or a convex-concave matching structure, and its edge is provided with a sealing strip. When closed, the sealing strip adheres to the pool cover 16, without affecting the pool cover's heat insulation and debris prevention effects; when the pool cover 16 is closed and personnel are trapped in the pool, or when emergency maintenance is required, the escape window 19 can be quickly opened to provide a safe entry and exit passage and avoid safety accidents.

[0058] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A lifting device, characterized in that, include: A fixed sleeve, and a main lifting sleeve disposed inside the fixed sleeve and capable of moving up and down along the axial direction of the fixed sleeve, wherein a support plate is fixedly disposed inside the cavity of the main lifting sleeve; A reduction gearbox is located at the top of the cavity of the main lifting sleeve, the reduction gearbox is connected to a drive motor, and the reduction gearbox is mounted on the support plate; An installation sleeve is fixed to the bottom surface of the support plate. An axial cavity is provided inside the installation sleeve. A support sleeve that can rotate around its own axis is provided inside the axial cavity. A plane bearing is provided between the support plate and the support sleeve. The upper and lower surfaces of the plane bearing abut against the support plate and the support sleeve, respectively. A threaded rod, the upper end of which is connected to a support sleeve and extends axially upward to the inner hole of a plane bearing, and the lower end of which is threadedly connected to a main threaded sleeve, which is fixedly connected to the bottom of a fixed sleeve. The output shaft of the gearbox extends axially downwards through the support plate and connects to the threaded rod.

2. The lifting device according to claim 1, characterized in that, The main lifting sleeve is fixedly connected to the support plate via a support cage. The support cage is located inside the cavity of the main lifting sleeve and surrounds the outside of the drive motor and the gearbox. The upper end of the support cage is fixedly connected to the main lifting sleeve, and its lower end is fixedly connected to the support plate.

3. A lifting device according to claim 2, characterized in that, The bottom edge of the mounting sleeve extends inward along the circumference of the mounting sleeve to form a limiting ring, and the bottom end of the support sleeve extends inward along the circumference of the support sleeve and bends downward through the circular hole of the limiting ring to form a support sleeve that restricts the axial displacement of the support sleeve.

4. A lifting device according to claim 3, characterized in that, The inner hole of the pipe connecting the support sleeve and the threaded rod is a polygonal hole, and the thread on the outer surface of the upper end of the threaded rod is a polygonal thread segment adapted to the polygonal hole, and the polygonal external thread segment is clearance-fitted with the polygonal hole. The outer surface of the output shaft of the gearbox is provided with a connecting key, and the upper end of the threaded rod is provided with a keyway that is adapted to the output shaft and the connecting key. The output shaft and the connecting key are inserted into the keyway.

5. A lifting device according to claim 1, characterized in that, The lifting device further includes an auxiliary lifting sleeve, which is disposed between the fixed sleeve and the main lifting sleeve, and is slidably connected to the fixed sleeve and the main lifting sleeve respectively.

6. A lifting device according to claim 5, characterized in that, The lifting device also includes a secondary threaded sleeve. The outer surface of the secondary threaded sleeve is provided with an external thread that matches the internal thread of the main threaded sleeve, and its inner surface is provided with an internal thread that meshes with the external thread of the threaded rod. The auxiliary threaded sleeve is threadedly connected to the main threaded sleeve via the external thread, and the auxiliary threaded sleeve is threadedly connected to the threaded rod via the internal thread.

7. A lifting device according to claim 6, characterized in that, The cavity of the main lifting sleeve is also embedded with a telescopic spring wire that is electrically connected to the drive motor.

8. A lifting pool cover comprising the lifting device according to any one of claims 1 to 7, characterized in that, include: Pool cover and multiple lifting devices; The pool cover has threaded holes on its side, and the main lifting sleeves of the multiple lifting devices have column connecting plates on their sides. The column connecting plates are bolted to the side of the pool cover.

9. A lifting pool cover according to claim 8, characterized in that, A lifting controller is also provided on the side of the pool cover; The drive motors inside the multiple lifting devices are electrically connected to the lifting controller.

10. A lifting pool cover according to claim 9, characterized in that, The pool cover is also equipped with an escape window.

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