A lifting device

Abstract

This invention discloses a lifting device, comprising: a first sleeve, a second sleeve, and a third sleeve, which are slidably sleeved relative to each other from the outside to the inside; a first lead screw, which passes through the first sleeve and passes through the second sleeve to drive the second sleeve to extend / retract; a second lead screw, which passes through the second sleeve and is parallel to the first lead screw, and passes through the third sleeve to drive the third sleeve to extend / retract; a transmission assembly, through which the first lead screw and the second lead screw are transmitted after the second sleeve is driven to extend / retract; a first lead screw nut, which is disposed at the upper end of the second sleeve and sleeved on the first lead screw, and is fixed at the upper end of the second sleeve during the extension / retraction of the second sleeve, and is rotatable relative to the upper end of the second sleeve after the second sleeve is fully extended / retracted; and a second lead screw nut, which is disposed at the upper end of the third sleeve and sleeved on the second lead screw.

Description

Technical Field

[0001] This invention relates to the field of lifting tools, and more specifically to a lifting device. Background Technology

[0002] Screw jacking devices primarily utilize the characteristic of a screw to convert rotary motion into linear motion for platform lifting. The electric drive mechanism transmits power from the electric motor to the screw reducer via a reducer, shaft, or chain, ultimately transmitting it to the screw, thus converting rotary motion into linear motion to lift the platform. Because screw jacking devices use a helical lifting mechanism, they offer advantages such as compact structure, smooth operation, and accurate transmission. Furthermore, the trapezoidal screw facilitates self-locking, ensuring safety and reliability.

[0003] With the increasing demand for applications, the need for adjustable lifting height range of screw jacks is also increasing. Screw jacks with two-stage lifting adjustment can no longer meet the application requirements. Therefore, screw jacks with three or more stages are needed. How to achieve lifting transmission of screw jacks with three or more stages is the research direction in this field.

[0004] Existing technologies include three-stage or multi-stage screw jack solutions. For example, Chinese utility model patent application number 200620113811.3, entitled "Parallel Double Lead Screw Jacking Device," discloses a parallel double lead screw jacking device, including a drive mechanism, a first transmission mechanism, and a second transmission mechanism. The first transmission mechanism includes a lead screw driven by the drive mechanism and a telescopic tube assembly threaded to the lead screw and capable of linear movement relative to it. The end of the telescopic tube assembly is fixed to a connector. The second transmission mechanism is arranged parallel to one side of the first transmission mechanism and includes a sleeve driven to rotate by the drive mechanism, a telescopic tube assembly housed inside the sleeve and capable of axial movement relative to it, and a lead screw threaded to the telescopic tube assembly and capable of linear movement relative to it. The end of the telescopic tube assembly is connected to the aforementioned connector. This achieves mutual interchangeability of the lead screws and reduces costs.

[0005] The parallel double-guide screw lifting device disclosed in the aforementioned patent application realizes three-level lifting adjustment of the first sliding unit 5, the second sliding unit 6, and the third sliding unit 7. However, this patent uses a parallel arrangement of guide screws 21 and 34, with both guide screws connected to the drive mechanism. This results in the length of guide screw 34 needing to be the same as the unfolded length of the three-level sliding unit, making the overall structure of guide screw 34 complex. In particular, the structure of the guide screw becomes more complex with each additional level of sliding unit.

[0006] Therefore, this patent application aims to solve the technical problems of existing three-stage or multi-stage screw lifting devices having complex transmission mechanisms, inconvenient assembly, and high costs. Summary of the Invention

[0007] To address the aforementioned problems, this invention proposes a lifting device that is simple in structure, easy to install, compact in size, and low in cost. Specifically, the following technical solution is adopted:

[0008] A lifting device, comprising:

[0009] The first sleeve, the second sleeve, and the third sleeve can be slidably sleeved together relative to each other from the outside to the inside.

[0010] A first lead screw is installed inside a first sleeve and also through a second sleeve, driving the second sleeve to extend / retract.

[0011] The second lead screw is installed inside the second sleeve and is parallel to the first lead screw. The second lead screw is installed through the third sleeve and drives the third sleeve to extend / retract.

[0012] In the transmission assembly, after the second sleeve is extended / retracted by the first lead screw, the first lead screw is transmitted to the second lead screw through the transmission assembly;

[0013] The first lead screw nut is set at the upper end of the second sleeve. The first lead screw nut is sleeved on the first lead screw. During the extension / retraction of the second sleeve, the first lead screw nut is fixed at the upper end of the second sleeve. After the second sleeve is fully extended / retracted, the second lead screw nut can rotate relative to the upper end of the second sleeve.

[0014] The second lead screw nut is located at the upper end of the third sleeve, and the second lead screw nut is sleeved on the second lead screw.

[0015] As an optional embodiment of the present invention, the transmission assembly includes:

[0016] The first gear is fixedly installed at the lower end of the first lead screw;

[0017] The second gear is located at the upper end of the second lead screw. After the second sleeve extends out of the first sleeve, the second gear meshes with the first gear for transmission. When the first lead screw rotates in the forward direction, the first gear meshes with the second gear to drive the second lead screw to rotate and drive the third sleeve to extend. When the first lead screw rotates in the reverse direction, the first gear meshes with the second gear to drive the second gear to rotate freely on the second lead screw.

[0018] The third gear is located at the lower end of the second lead screw. After the second sleeve retracts into the first sleeve, the third gear meshes with the first gear for transmission. When the first lead screw rotates in the forward direction, the first gear meshes with the third gear for transmission, and the third gear rotates freely on the second lead screw. When the first lead screw rotates in the reverse direction, the first gear meshes with the third gear for transmission, and the third gear drives the second lead screw to rotate, driving the third sleeve to retract.

[0019] As an optional embodiment of the present invention, the transmission assembly includes:

[0020] The first one-way bearing is sleeved on the upper end of the second lead screw, and the second gear is sleeved on the first one-way bearing;

[0021] The second one-way bearing is sleeved on the lower end of the second lead screw, and the third gear is sleeved on the second one-way bearing;

[0022] The first one-way bearing and the second one-way bearing are mounted on the second lead screw, and their one-way rotation directions are opposite.

[0023] As an optional embodiment of the present invention, a first mounting port is opened at the upper end of the second sleeve, a bearing is installed in the first mounting port, and the first lead screw nut is installed in the bearing. A locking buckle is provided at the outer periphery of the upper end of the second sleeve at the first mounting port. The locking buckle includes a vertical wall and a horizontal wall located at the upper end of the vertical wall. The lower end of the vertical wall extends through the upper end of the second sleeve and into the second sleeve. The first lead screw nut has a locking slot. The horizontal wall of the locking buckle engages with the locking slot, fixing the first lead screw nut at the upper end of the second sleeve. When the upper end of the second sleeve moves to the lower end of the first sleeve, the vertical wall of the locking buckle is lifted, and the horizontal wall of the locking buckle separates from the locking slot. The second lead screw nut can rotate relative to the upper end of the second sleeve.

[0024] As an optional embodiment of the present invention, the locking buckle is disposed on the outer periphery of the first mounting port and located above the first gear. During the extension of the second sleeve, the upper end of the second sleeve moves to the lower end of the first sleeve, the vertical wall of the locking buckle is pushed up by the end face of the first gear, and the horizontal wall of the locking buckle separates from the locking port.

[0025] The free end of the vertical wall of the locking buckle is spherical or has a ball bearing at the free end of the vertical wall of the locking buckle, which contacts the end face of the first gear.

[0026] As an optional embodiment of the present invention, the first gear and the inner wall of the first sleeve are spaced apart, the locking buckle is disposed on the outer periphery of the first mounting port and located above the space, during the extension of the second sleeve, the upper end of the second sleeve moves to the lower end of the first sleeve, the vertical wall of the locking buckle is pushed up by the bottom wall of the first sleeve, and the horizontal wall of the locking buckle separates from the locking port.

[0027] As an optional embodiment of the present invention, an electromagnetic device is provided at the upper end of the first sleeve corresponding to the locking buckle. The locking buckle is made of ferromagnetic material. A position detection device is provided on the inner wall of the first sleeve. During the retraction of the second sleeve, the upper end of the second sleeve moves to the point where it triggers the position detection device and then stops. The electromagnetic device is then energized to attract the locking buckle to move upward, and the horizontal wall of the locking buckle separates from the locking slot.

[0028] As an optional embodiment of the present invention, the first sleeve includes:

[0029] The first cylinder has a hollow slide inside;

[0030] The first upper end cap is fixed to the upper end of the first cylinder and seals the upper end of the hollow slide of the first cylinder.

[0031] The first lower end cover is spaced apart from the inner wall of the hollow slide at the lower end of the first cylinder. The first lower end cover is detachably and fixedly connected to the hollow slide at the lower end of the first cylinder by a plurality of first connecting ribs. A first through-hole is formed between the first lower end cover, the inner wall of the hollow slide of the first cylinder and the first connecting ribs for the cylinder wall of the second sleeve to pass through. The first lower end cover is sealed on the side of the hollow slide of the first cylinder corresponding to the first lead screw, and the side of the hollow slide of the first cylinder corresponding to the second lead screw is open.

[0032] The upper end of the first lead screw is rotatably mounted on the first upper end cover, and the lower end of the first lead screw is rotatably mounted on the first lower end cover.

[0033] As an optional embodiment of the present invention, the second sleeve includes:

[0034] The second cylinder has the same cross-sectional shape as the first cylinder, and the interior of the second cylinder has a hollow slide.

[0035] The second upper end cap is fixed to the upper end of the second cylinder and seals the upper end of the hollow slide of the second cylinder.

[0036] The second lower end cover is spaced apart from the inner wall of the hollow slide at the lower end of the second cylinder. The second lower end cover is detachably and fixedly connected to the hollow slide at the lower end of the second cylinder by a plurality of second connecting ribs. A second through-hole is formed between the second lower end cover, the inner wall of the hollow slide of the second cylinder and the second connecting ribs for the cylinder wall of the third sleeve to pass through.

[0037] The first mounting port is opened on the second upper end cover, the upper end of the second lead screw is rotatably mounted on the second upper end cover, the lower end of the second lead screw is rotatably mounted on the second lower end cover, and the second lead screw and the first lead screw are kept parallel to each other.

[0038] The second cylinder has a first clearance channel that runs vertically through the cylinder wall, and the first clearance channel is provided corresponding to the first connecting rib.

[0039] As an optional embodiment of the present invention, the third sleeve includes:

[0040] The third cylinder has the same cross-sectional shape as the first and second cylinders, and the interior of the third cylinder has a hollow slide.

[0041] The third upper end cover is fixed to the upper end of the third cylinder and covers the side of the hollow slide of the third cylinder corresponding to the second lead screw. The side of the hollow slide of the third cylinder corresponding to the first lead screw is open.

[0042] The third lower end cover is detachably fixed to the lower end of the third cylinder and seals the lower end of the hollow slide of the third cylinder.

[0043] The third upper end cover has a third mounting port for the lower end of the second lead screw to pass through, and the third cylinder has a second clearance channel that passes through vertically on the cylinder wall, the second clearance channel being provided corresponding to the second connecting rib.

[0044] As an optional embodiment of the present invention, a lifting device of the present invention includes:

[0045] The upper support seat is rotatably mounted on the outer wall of the first sleeve in the middle.

[0046] The lower support is rotatably mounted on the bottom wall of the third sleeve in the middle.

[0047] The first traction brake line connects the front section of the upper support seat to the rear section of the lower support seat. When the front section of the upper support seat is pressed down, the first traction brake line pulls the rear section of the lower support seat to be lifted.

[0048] The second traction brake line connects the rear section of the upper support seat to the front section of the lower support seat. When the rear section of the upper support seat is pressed down, the second traction brake line pulls the front section of the lower support seat to be lifted.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0050] The present invention provides a lifting device comprising a first sleeve, a second sleeve, and a third sleeve, forming a three-stage lifting mechanism. It only requires driving the first lead screw to rotate, and the first lead screw and the first lead screw nut drive the second sleeve to extend / retract. After the second sleeve extends / retracts, the first lead screw drives the second lead screw through a transmission assembly, and the second lead screw rotates, and the second lead screw and the second lead screw nut drive the third sleeve to extend / retract.

[0051] Therefore, the lifting device of the present invention adopts a step-by-step transmission method between each level of lifting mechanism. The lead screw and sleeve of the next level move synchronously. After moving to a certain position, they are transmitted to the lead screw of the previous level through the transmission mechanism. The lead screw of the next level does not need to be processed to be very long, which simplifies the structure of the multi-stage lifting mechanism, reduces the cost, and can realize the lifting of three or even more levels of sleeve. Attached image description:

[0052] Figure 1 A three-dimensional structural schematic diagram (initial state) of a lifting device according to an embodiment of the present invention;

[0053] Figure 2 A side view (initial state) of a lifting device according to an embodiment of the present invention;

[0054] Figure 3 An embodiment of the present invention provides a lifting device along Figure 2 Cross-sectional view of plane AA (initial state);

[0055] Figure 4 A three-dimensional structural diagram of a lifting device according to an embodiment of the present invention (second sleeve extended state);

[0056] Figure 5 A side view of a lifting device according to an embodiment of the present invention (second sleeve extended state);

[0057] Figure 6 An embodiment of the present invention provides a lifting device along Figure 5 A cross-sectional view of the middle AA surface (with the second sleeve extended);

[0058] Figure 7 A three-dimensional structural diagram of a lifting device according to an embodiment of the present invention (with the second and third sleeves extended);

[0059] Figure 8 A side view of a lifting device according to an embodiment of the present invention (with the second and third sleeves extended);

[0060] Figure 9 An embodiment of the present invention provides a lifting device along Figure 8 A cross-sectional view of the middle AA surface (with the second and third sleeves extended);

[0061] Figure 10 A partial sectional view of a lifting device according to an embodiment of the present invention (with the second and third sleeves extended);

[0062] Figure 11 Embodiments of the present invention Figure 10 A magnified view of a section at point B in the middle;

[0063] Figure 12A partially enlarged view of the first lead screw bolt assembly method of a lifting device according to an embodiment of the present invention;

[0064] Figure 13 A partially enlarged view of the first lead screw bolt assembly method of a lifting device according to an embodiment of the present invention (another embodiment);

[0065] Figure 14 A partial sectional view of a lifting device according to an embodiment of the present invention (second sleeve retracted state);

[0066] Figure 15 Embodiments of the present invention Figure 14 A magnified view of a section at point C;

[0067] Figure 16 A three-dimensional structural schematic diagram (top view) of the first sleeve of a lifting device according to an embodiment of the present invention;

[0068] Figure 17 A three-dimensional structural schematic diagram (from below) of the first sleeve of a lifting device according to an embodiment of the present invention;

[0069] Figure 18 A three-dimensional structural schematic diagram (top view) of the second sleeve of a lifting device according to an embodiment of the present invention;

[0070] Figure 19 A three-dimensional structural schematic diagram (from below) of the second sleeve of a lifting device according to an embodiment of the present invention;

[0071] Figure 20 A three-dimensional structural schematic diagram (top view) of the third sleeve of a lifting device according to an embodiment of the present invention;

[0072] Figure 21 A three-dimensional structural diagram (from below) of the third sleeve of a lifting device according to an embodiment of the present invention. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0074] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0075] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0076] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0077] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this invention and simplifying the description, and do not 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 invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0078] See Figures 1-21 As shown, a lifting device according to this embodiment includes:

[0079] The first sleeve 100, the second sleeve 200, and the third sleeve 300 can be slidably sleeved together from the outside to the inside.

[0080] The first lead screw 400 is disposed inside the first sleeve 100 and is disposed inside the second sleeve 200, driving the second sleeve 200 to extend / retract;

[0081] The second lead screw 500 is disposed inside the second sleeve 200 and is parallel to the first lead screw 400. The second lead screw 400 is disposed through the third sleeve 300 and drives the third sleeve 300 to extend / retract.

[0082] In the transmission assembly, after the second sleeve 200 is driven to extend / retract by the first lead screw 400, the first lead screw 400 transmits power to the second lead screw 500 through the transmission assembly.

[0083] The first lead screw nut 601 is disposed at the upper end of the second sleeve 200. The first lead screw nut 601 is sleeved on the first lead screw 400. During the extension / retraction of the second sleeve 200, the first lead screw nut 601 is fixed at the upper end of the second sleeve 200. After the second sleeve 200 is fully extended / retracted, the second lead screw nut 601 can rotate relative to the upper end of the second sleeve 200.

[0084] The second lead screw nut 602 is located at the upper end of the third sleeve 300, and the second lead screw nut 602 is sleeved on the second lead screw 500.

[0085] This embodiment of a lifting device comprises a three-stage lifting mechanism consisting of a first sleeve 100, a second sleeve 200, and a third sleeve 300. In this embodiment, only the first lead screw 400 needs to be driven to rotate. The first lead screw 400 and the first lead screw nut 601 drive the second sleeve 200 to extend / retract. After the second sleeve 200 extends / retracts, the first lead screw 400 is driven to the second lead screw 500 through a transmission assembly. The second lead screw 500 rotates, and the second lead screw 500 and the second lead screw nut 602 drive the third sleeve 300 to extend / retract.

[0086] Therefore, the lifting device in this embodiment adopts a step-by-step transmission method between each level of lifting mechanism. The lead screw and sleeve of the next level move synchronously. After moving to a certain position, they are transmitted to the lead screw of the previous level through the transmission mechanism. The lead screw of the next level does not need to be processed to be very long, which simplifies the structure of the multi-stage lifting mechanism, reduces the cost, and can realize the lifting of three or even more levels of sleeve.

[0087] In addition, in this embodiment, the first lead screw nut 601 and the first lead screw 400 are connected by a thread. After the second sleeve 200 extends out of the first sleeve 100, since the first lead screw 400 still needs to continue to rotate to drive the second lead screw 500 to rotate, the first lead screw nut 601 can rotate relative to the upper end of the second sleeve 200. The rotation of the first lead screw 400 will no longer be transmitted to the second sleeve 200. This ensures the power transmission between the first lead screw 400 and the second lead screw 500. The second lead screw 500 further drives the third sleeve 300 to extend, while ensuring that the first lead screw 400 no longer transmits power to the second sleeve 200.

[0088] See Figures 1-9 As shown, the transmission assembly described in this embodiment includes:

[0089] The first gear 701 is fixedly installed at the lower end of the first lead screw 400;

[0090] The second gear 702 is disposed at the upper end of the second lead screw 500. After the second sleeve 200 extends out of the first sleeve 100, the second gear 702 meshes with the first gear 701 for transmission. When the first lead screw 400 rotates in the forward direction, the first gear 701 meshes with the second gear 702 to drive the second lead screw 500 to rotate and drive the third sleeve 300 to extend. When the first lead screw 400 rotates in the reverse direction, the first gear 701 meshes with the second gear 702 to rotate freely on the second lead screw 500.

[0091] The third gear 703 is located at the lower end of the second lead screw 500. After the second sleeve 200 retracts the first sleeve 100, the third gear 703 meshes with the first gear 701 for transmission. When the first lead screw 400 rotates in the forward direction, the first gear 701 meshes with the third gear 703 for free rotation on the second lead screw 500. When the first lead screw 400 rotates in the reverse direction, the first gear 701 meshes with the third gear 703 to drive the second lead screw 500 to rotate and drive the third sleeve 300 to retract.

[0092] Specifically, the extension process of the lifting device in this embodiment is as follows:

[0093] See Figure 3 In the initial state, the first gear 701 and the third gear 703 are in a meshed state, see [reference]. Figure 3 and Figure 6 As shown, when the second sleeve 200 extends out of the first sleeve 100, the first lead screw 400 rotates in the forward direction, driving the second sleeve 200 to extend via the first lead screw nut 601. The first lead screw 400 drives the first gear 701 to rotate synchronously. Although the first gear 701 and the third gear 703 are in a meshing state, when the first lead screw 400 rotates in the forward direction, the first gear 701 meshes with and drives the third gear 703 to rotate freely on the second lead screw 500. The third gear 703 does not drive the second lead screw 500 to rotate. In this way, the extension of the first sleeve 200 by the second lead screw 500 is achieved. Figures 1 to 4 The extension movement of the second sleeve 200.

[0094] See Figure 6 As shown, after the second sleeve 200 extends beyond the first sleeve 100, the first gear 701 and the second gear 702 mesh and drive each other, causing the first lead screw 400 to rotate in the forward direction. The first gear 701 meshes and drives the second gear 702, which in turn drives the second lead screw 500 to rotate, thus extending the third sleeve 300. The extended state of the third sleeve 300 is as follows: Figure 7-9 As stated above.

[0095] The retraction process of the lifting device in this embodiment is as follows:

[0096] See Figure 7-9 As shown, when the first lead screw 400 is rotated in the reverse direction, the first gear 701 and the second gear 702 are in a meshing state. However, when the first lead screw 400 rotates in the reverse direction, the first gear 701 meshes with and drives the second gear 702 to rotate freely on the second lead screw 500. At this time, the reverse motion of the first lead screw 400 is not transmitted to the second lead screw 500. The first lead screw drives the second sleeve 200 to retract to the first sleeve 100 through the first lead screw nut 601. At this time, the third sleeve 300 has not yet retracted. See [reference needed]. Figure 14The diagram shows the state of the second sleeve 200 retracted into the first sleeve 100. Due to the meshing and transmission between the first gear 701 and the third gear 703 of the second sleeve 200, the first lead screw 400 rotates in the opposite direction, and the first gear 701 meshes and transmits the transmission between the third gear 703 and the second lead screw 500, thereby driving the third sleeve 300 to retract.

[0097] Therefore, this embodiment achieves the transmission of power from the first lead screw 400 to the second lead screw 500 by setting a second gear 702 and a third gear 703 at the upper and lower ends of the second lead screw 500, respectively. Both gears transmit the rotation of the first gear 701 in one direction, thus ensuring the stability of the movement.

[0098] As an optional implementation method in this embodiment, see Figure 3 As shown, the transmission assembly described in this embodiment includes:

[0099] The first one-way bearing 801 is sleeved on the upper end of the second lead screw 500, and the second gear 702 is sleeved on the first one-way bearing 801.

[0100] The second one-way bearing 802 is sleeved on the lower end of the second lead screw 500, and the third gear 703 is sleeved on the second one-way bearing;

[0101] The first one-way bearing 801 and the second one-way bearing 802 are mounted on the second lead screw 500, and their one-way rotation directions are opposite.

[0102] In this embodiment, the unidirectional meshing transmission of the first gear 701 and the second gear 702 is achieved by using two one-way bearings 801 and 802 with opposite rotation directions.

[0103] See Figures 11-12 As shown, in order to achieve the following during the extension of the second sleeve 200, the first lead screw nut 601 is fixed at the upper end of the second sleeve 200. After the second sleeve 200 is fully extended, the second lead screw nut 601 can rotate relative to the upper end of the second sleeve 200. This embodiment adopts the following technical solution:

[0104] In this embodiment, the upper end of the second sleeve 200 has a first mounting port 204, and a bearing 900 is installed in the first mounting port 204. The first lead screw nut 601 is installed in the bearing 900. A locking buckle 1500 is provided on the outer periphery of the upper end of the second sleeve 200 at the first mounting port 204. The locking buckle 1500 includes a vertical wall 1502 and a horizontal wall 1501 located at the upper end of the vertical wall 1502. The lower end of the vertical wall 1502 passes through the upper end of the second sleeve 200 and extends into the second sleeve 200. The first lead screw nut 601 has a locking slot 601A. The horizontal wall 1501 of the locking buckle 1500 engages with the locking slot 601A, fixing the first lead screw nut 601 to the upper end of the second sleeve 200. When the upper end of the second sleeve 200 moves to the lower end of the first sleeve 100, the vertical wall 1502 of the locking buckle 1500 is lifted up, and the horizontal wall 1501 of the locking buckle 1500 separates from the locking slot 601A. The second lead screw nut 601 can rotate relative to the upper end of the second sleeve 200.

[0105] In this embodiment, a bearing sleeve 1600 is installed inside the first mounting port 204, and the bearing 900 is installed inside the bearing sleeve 1600.

[0106] Specifically, in this embodiment, the locking buckle 1500 is disposed on the outer periphery of the first mounting port 204 and located above the first gear 701. The upper end of the second sleeve 200 moves to the lower end of the first sleeve 100. The vertical wall 1502 of the locking buckle 1500 is pushed up by the end face of the first gear 7001, and the horizontal wall 1501 of the locking buckle 1500 separates from the locking slot 601A. The free end of the vertical wall 1502 of the locking buckle 1500 is spherical or has a ball bearing, which contacts the end face of the first gear 701. Because the first gear 701 rotates, this reduces the friction between the free end of the vertical wall 1502 of the locking buckle 1500 and the end face of the first gear 701.

[0107] See Figure 12 As shown, in an optional embodiment, the first gear 701 and the inner wall of the first sleeve 200 are spaced apart. The locking buckle 1500 is located on the outer periphery of the first mounting opening 204 and above the space. The upper end of the second sleeve 200 moves to the lower end of the first sleeve 100, and the vertical wall 1502 of the locking buckle 1500 is pushed up by the bottom wall of the first sleeve 100. The horizontal wall 1501 of the locking buckle 1500 separates from the locking opening 601A. This avoids contact friction between the locking buckle 1500 and the first gear 701.

[0108] See Figure 14 and Figure 15 As shown, in this embodiment, when the lifting device retracts, it first drives the second sleeve 200 to retract into the first sleeve 100, and then drives the third sleeve 300 to retract into the second sleeve 200. Figure 14 After the second sleeve 200 retracts into the first sleeve 100, the first lead screw 400 needs to continue rotating. The rotation of the first lead screw 400 is transmitted to the second lead screw 500 through the meshing transmission between the first gear 701 and the third gear 703. The second lead screw 500 drives the second lead screw nut 602 to retract the third sleeve 300. During this process, since the first lead screw 400 still needs to continue rotating after the second sleeve 200 retracts into the first sleeve 100, but the first lead screw 400 is threadedly connected to the first lead screw nut 601, to prevent the first lead screw nut 601 from obstructing the continued rotation of the first lead screw 400, in this embodiment, an electromagnetic device 1800 is provided at the upper end of the first sleeve 100 corresponding to the locking buckle 1500. The locking buckle 1800 is made of ferromagnetic material, and a position detection device 17 is provided on the inner wall of the first sleeve 100. During the retraction of the second sleeve 200, the upper end of the second sleeve 200 moves to the trigger position detection device 1700 and stops. The electromagnetic device 1800 is energized to attract the locking buckle 1500 to move upward. The horizontal wall 1501 of the locking buckle 1500 separates from the locking slot 601A, releasing the fixation between the first lead screw nut 601 and the first sleeve 100. The first lead screw nut 601 can rotate freely under the action of the bearing 900 and will not hinder the continued rotation of the first lead screw 400.

[0109] See Figure 16 and Figure 17 As shown, the first sleeve 100 in this embodiment includes:

[0110] The first cylinder 101 has a hollow slide inside;

[0111] The first upper end cover 102 is fixed to the upper end of the first cylinder 101 and covers the upper end of the hollow slide of the first cylinder 101.

[0112] The first lower end cover 103 is spaced apart from the inner wall of the hollow slide at the lower end of the first cylinder 101. The first lower end cover 103 is detachably and fixedly connected to the hollow slide at the lower end of the first cylinder 101 by a plurality of first connecting ribs 106. A first through-hole is formed between the first lower end cover 103, the inner wall of the hollow slide of the first cylinder 101 and the first connecting ribs 106 for the cylinder wall of the second sleeve 200 to pass through. The first lower end cover 103 covers the side of the hollow slide of the first cylinder 100 corresponding to the first lead screw 400, and the side of the hollow slide of the first cylinder 101 corresponding to the second lead screw 500 is open.

[0113] The upper end of the first lead screw 400 is rotatably mounted on the first upper end cover 102, and the lower end of the first lead screw 400 is rotatably mounted on the first lower end cover 103.

[0114] Specifically, a second mounting port 104 is opened on the first upper end cover 102, and a bearing seat is installed on the inner wall of the first upper end cover 102 corresponding to the second mounting port 104. A bearing 900 is installed in the bearing seat, and the upper end of the first lead screw 400 passes through the bearing 900 and extends out of the first sleeve 100 through the second mounting port 104. In this embodiment, a bearing seat is installed on the inner wall of the first lower end cover 103, and a bearing 900 is installed in the bearing seat. The lower end of the first lead screw 400 is installed in the bearing 900.

[0115] The lifting device in this embodiment includes a drive motor 100, a first bevel gear 1101 mounted on the output shaft of the drive motor, and a second bevel gear 1102 mounted on the part of the first lead screw 400 extending out of the first sleeve 100. The first bevel gear 1101 and the second bevel gear 1102 mesh and transmit power, thus enabling the drive motor 100 to drive the first lead screw 400 to rotate.

[0116] See Figure 18 and Figure 19 As shown, the second sleeve 200 described in this embodiment includes:

[0117] The second cylinder 201 has the same cross-sectional shape as the first cylinder 101, and the second cylinder 201 has a hollow slide inside.

[0118] The second upper end cover 202 is fixed to the upper end of the second cylinder 201 and covers the upper end of the hollow slide of the second cylinder 201.

[0119] The second lower end cover 203 is spaced apart from the inner wall of the hollow slide at the lower end of the second cylinder 201. The second lower end cover 203 is detachably and fixedly connected to the hollow slide at the lower end of the second cylinder 201 by a plurality of second connecting ribs 206. A second through-hole is formed between the second lower end cover 203, the inner wall of the hollow slide of the second cylinder 201 and the second connecting ribs 206 for the cylinder wall of the third sleeve 300 to pass through.

[0120] The first mounting port 204 is opened on the second upper end cover 202. The upper end of the second lead screw 500 is rotatably mounted on the second upper end cover 202, and the lower end of the second lead screw 500 is rotatably mounted on the second lower end cover 203. The second lead screw 500 and the first lead screw 400 are kept parallel to each other.

[0121] The second cylindrical body 201 has a first clearance channel 205 that runs vertically through the cylinder wall, and the first clearance channel 205 is provided corresponding to the first connecting rib 106.

[0122] In this embodiment, a bearing seat is installed on the inner wall of the second upper end cover 202 corresponding to the first mounting port 204, and a bearing 900 is installed inside the bearing seat. The upper end of the second lead screw 500 is installed inside the bearing 900. In this embodiment, a bearing seat is installed on the inner wall of the second lower end cover 203, and a bearing 900 is installed inside the bearing seat. The lower end of the second lead screw 500 is installed inside the bearing 900.

[0123] See Figure 20 and Figure 21 As shown, the third sleeve 300 described in this embodiment includes:

[0124] The third cylinder 301 has the same cross-sectional shape as the first cylinder 101 and the second cylinder 201, and the third cylinder 301 has a hollow slide inside.

[0125] The third upper end cover 302 is fixed to the upper end of the third cylinder 301 and covers the side of the hollow slide of the third cylinder 301 corresponding to the second lead screw 500. The hollow slide of the third cylinder 301 is provided with an opening 306 on the side corresponding to the first lead screw 400.

[0126] The third lower end cover 303 is detachably fixed to the lower end of the third cylinder 301, and covers the lower end of the hollow slide of the third cylinder 301;

[0127] The third upper end cover 302 has a third mounting port 304 for the lower end of the second lead screw 500 to pass through. The second lead screw nut 602 is installed in the third mounting port 304. The third cylinder 301 has a second clearance channel 305 that passes through vertically on the cylinder wall. The second clearance channel 305 is set corresponding to the second connecting rib 206.

[0128] The lifting device in this embodiment, comprising the first sleeve 100, the second sleeve 200, and the third sleeve 300, is assembled as follows:

[0129] Open the first lower end cover 103 of the first sleeve 100, install the upper end of the first lead screw 400, and leave the lower end suspended.

[0130] Open the second lower end cover 203 of the second sleeve 200, install the upper end of the second lead screw 500, with the lower end suspended, and install the second gear 702;

[0131] Insert the second sleeve 200 into the first sleeve 100 from the lower end of the first sleeve 100;

[0132] Install the first gear 701 at the lower end of the first lead screw 400, install the first lower end cover 103, and simultaneously install the lower end of the first lead screw 400.

[0133] Open the third lower end cap 303 of the third sleeve 300 and insert it into the second sleeve 200;

[0134] Install the third gear 703 at the lower end of the second lead screw 500, install the second lower end cover 203, and simultaneously install the lower end of the second lead screw 500;

[0135] Install the third lower end cap 303 of the third sleeve 300;

[0136] Assembly complete.

[0137] See Figures 1-9 As shown, a lifting device according to this embodiment includes:

[0138] The upper support 1400 is rotatably mounted on the outer wall of the first sleeve 100 in the middle.

[0139] The lower support 1200 is rotatably mounted on the bottom wall of the third sleeve 300 in the middle.

[0140] The first traction brake line 1300A connects the front section 1401 of the upper support seat 1400 and the rear section 1202 of the lower support seat 1200. When the front section 1401 of the upper support seat 1400 is pressed down, the first traction brake line 1300A pulls the rear section 1202 of the lower support seat 1200 to be lifted.

[0141] The second traction brake line 1300B connects the rear section 1402 of the upper support seat 1400 to the front section 1201 of the lower support seat 1200. When the rear section of the upper support seat 1402 is pressed down, the second traction brake line 1300B pulls the front section 1201 of the lower support seat 1200 to be lifted.

[0142] In this embodiment, the upper support seat 1400 is used to support the user's feet, and the lower support seat 1200 is supported on the support surface. The upper support seat 1400 and the lower support seat 1200 are connected by a traction brake cable, which can realize that the action of the user's foot stepping on the upper support seat 1400 is synchronously transmitted to the lower support seat 1200, so that the two move in sync, making it easier for the user to control and improving the user experience.

[0143] See Figure 16 As shown, in this embodiment, a rotating shaft 105 is fixed on the outer wall of the first sleeve 100, and the upper support seat 1400 is rotatably mounted on the rotating shaft 105. Specifically, a hydraulic bearing is provided between the rotating shaft 105 and the upper support seat 1400 to provide hydraulic support force for the upper support seat 1400.

[0144] See Figure 21 As shown, in this embodiment, a hinge seat 307 is fixed on the bottom wall of the third lower end cover 303 of the third sleeve 300, and the lower support seat 1200 of this embodiment is mounted on the hinge seat 307 by a hinge.

[0145] See Figure 1 As shown, in this embodiment, both the first traction brake line 1300A and the second traction brake line 1300B include a brake line sleeve 1301 and a brake line 1302. The two ends of the brake line sleeve 1301 are fixed to the outer wall of the first cylinder 100 and the lower support seat 1200 respectively via fixing collars 1303. The brake line 1302 slidably passes through the brake line sleeve 1301, and the two ends of the brake line 1302 are fixedly connected to the upper support seat 1400 and the lower support seat 1200 respectively. Thus, when the front or rear section of the upper support seat 1400 is pressed down, the traction brake line 1302 drives the rear or front section of the lower support seat to rise synchronously, maintaining a consistent motion.

[0146] It should be noted that this invention is explained using a three-stage sleeve lifting device as an example. However, it should be understood by those skilled in the art that the lifting device of this invention can be applied to the lifting of sleeves with more than three stages. Its basic principle is the same as the above discussion, only requiring the addition of a corresponding number of second sleeves and second lead screws and other related structures.

[0147] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A lifting device, characterized in that include: The first sleeve, the second sleeve, and the third sleeve can be slidably sleeved together relative to each other from the outside to the inside. A first lead screw is installed inside a first sleeve and also through a second sleeve, driving the second sleeve to extend / retract. The second lead screw is installed inside the second sleeve and is parallel to the first lead screw. The second lead screw is installed through the third sleeve and drives the third sleeve to extend / retract. In the transmission assembly, after the second sleeve is extended / retracted by the first lead screw, the first lead screw is transmitted to the second lead screw through the transmission assembly; The first lead screw nut is set at the upper end of the second sleeve. The first lead screw nut is sleeved on the first lead screw. During the extension / retraction of the second sleeve, the first lead screw nut is fixed at the upper end of the second sleeve. After the second sleeve is fully extended / retracted, the second lead screw nut can rotate relative to the upper end of the second sleeve. The second lead screw nut is located at the upper end of the third sleeve, and the second lead screw nut is sleeved on the second lead screw; The transmission assembly includes: The first gear is fixedly installed at the lower end of the first lead screw; The second gear is located at the upper end of the second lead screw. After the second sleeve extends out of the first sleeve, the second gear meshes with the first gear for transmission. When the first lead screw rotates in the forward direction, the first gear meshes with the second gear to drive the second lead screw to rotate and drive the third sleeve to extend. When the first lead screw rotates in the reverse direction, the first gear meshes with the second gear to drive the second gear to rotate freely on the second lead screw. The third gear is located at the lower end of the second lead screw. After the second sleeve retracts into the first sleeve, the third gear meshes with the first gear for transmission. When the first lead screw rotates in the forward direction, the first gear meshes with the third gear for transmission, and the third gear rotates freely on the second lead screw. When the first lead screw rotates in the reverse direction, the first gear meshes with the third gear for transmission, which drives the second lead screw to rotate and drives the third sleeve to retract. A first one-way bearing is sleeved on the upper end of the second lead screw, and the second gear is sleeved on the first one-way bearing; The second one-way bearing is sleeved on the lower end of the second lead screw, and the third gear is sleeved on the second one-way bearing; The first one-way bearing and the second one-way bearing are mounted on the second lead screw, and their one-way rotation directions are opposite.

2. A lifting device according to claim 1, characterised in that The upper end of the second sleeve has a first mounting port, and a bearing is installed in the first mounting port. The first lead screw nut is installed in the bearing. A locking buckle is provided on the outer periphery of the upper end of the second sleeve at the first mounting port. The locking buckle includes a vertical wall and a horizontal wall located at the upper end of the vertical wall. The lower end of the vertical wall extends through the upper end of the second sleeve and into the second sleeve. The first lead screw nut has a locking slot. The horizontal wall of the locking buckle engages with the locking slot, fixing the first lead screw nut to the upper end of the second sleeve. When the upper end of the second sleeve moves to the lower end of the first sleeve, the vertical wall of the locking buckle is lifted, and the horizontal wall of the locking buckle separates from the locking slot. The second lead screw nut can rotate relative to the upper end of the second sleeve.

3. A lifting device according to claim 2, characterised in that The locking buckle is located on the outer periphery of the first mounting port and above the first gear. During the extension of the second sleeve, the upper end of the second sleeve moves to the lower end of the first sleeve. The vertical wall of the locking buckle is pushed up by the end face of the first gear, and the horizontal wall of the locking buckle separates from the locking port. The free end of the vertical wall of the locking buckle is spherical or the free end of the vertical wall of the locking buckle is provided with a ball, which contacts the end face of the first gear. Alternatively, the first gear and the inner wall of the first sleeve are spaced apart, and the locking buckle is located on the outer periphery of the first mounting port and above the space. During the extension of the second sleeve, the upper end of the second sleeve moves to the lower end of the first sleeve, the vertical wall of the locking buckle is pushed up by the bottom wall of the first sleeve, and the horizontal wall of the locking buckle separates from the locking port.

4. A lifting device according to claim 2, characterized in that, An electromagnetic device is provided at the upper end of the first sleeve corresponding to the locking buckle. The locking buckle is made of ferromagnetic material. A position detection device is provided on the inner wall of the first sleeve. During the retraction of the second sleeve, the upper end of the second sleeve moves to the point where it triggers the position detection device and stops. The electromagnetic device is then energized to attract the locking buckle to move upward, and the horizontal wall of the locking buckle separates from the locking slot.

5. A lifting device according to claim 2, characterized in that, The first sleeve includes: The first cylinder has a hollow slide inside; The first upper end cap is fixed to the upper end of the first cylinder and seals the upper end of the hollow slide of the first cylinder. The first lower end cover is spaced apart from the inner wall of the hollow slide at the lower end of the first cylinder. The first lower end cover is detachably and fixedly connected to the hollow slide at the lower end of the first cylinder by a plurality of first connecting ribs. A first through-hole is formed between the first lower end cover, the inner wall of the hollow slide of the first cylinder and the first connecting ribs for the cylinder wall of the second sleeve to pass through. The first lower end cover is sealed on the side of the hollow slide of the first cylinder corresponding to the first lead screw, and the side of the hollow slide of the first cylinder corresponding to the second lead screw is open. The upper end of the first lead screw is rotatably mounted on the first upper end cover, and the lower end of the first lead screw is rotatably mounted on the first lower end cover.

6. A lifting device according to claim 5, characterized in that, The second sleeve includes: The second cylinder has the same cross-sectional shape as the first cylinder, and the interior of the second cylinder has a hollow slide. The second upper end cap is fixed to the upper end of the second cylinder and seals the upper end of the hollow slide of the second cylinder. The second lower end cover is spaced apart from the inner wall of the hollow slide at the lower end of the second cylinder. The second lower end cover is detachably and fixedly connected to the hollow slide at the lower end of the second cylinder by a plurality of second connecting ribs. A second through-hole is formed between the second lower end cover, the inner wall of the hollow slide of the second cylinder and the second connecting ribs for the cylinder wall of the third sleeve to pass through. The first mounting port is opened on the second upper end cover, the upper end of the second lead screw is rotatably mounted on the second upper end cover, the lower end of the second lead screw is rotatably mounted on the second lower end cover, and the second lead screw and the first lead screw are kept parallel to each other. The second cylinder has a first clearance channel that runs vertically through the cylinder wall, and the first clearance channel is provided corresponding to the first connecting rib.

7. A lifting device according to claim 6, characterized in that, The third sleeve includes: The third cylinder has the same cross-sectional shape as the first and second cylinders, and the interior of the third cylinder has a hollow slide. The third upper end cover is fixed to the upper end of the third cylinder and covers the side of the hollow slide of the third cylinder corresponding to the second lead screw. The side of the hollow slide of the third cylinder corresponding to the first lead screw is open. The third lower end cover is detachably fixed to the lower end of the third cylinder and seals the lower end of the hollow slide of the third cylinder. The third upper end cover has a third mounting port for the lower end of the second lead screw to pass through, and the third cylinder has a second clearance channel that passes through vertically on the cylinder wall, the second clearance channel being provided corresponding to the second connecting rib.

8. A lifting device according to any one of claims 1-7, characterized in that, include: The upper support seat is rotatably mounted on the outer wall of the first sleeve in the middle. The lower support is rotatably mounted on the bottom wall of the third sleeve in the middle. The first traction brake line connects the front section of the upper support seat to the rear section of the lower support seat. When the front section of the upper support seat is pressed down, the first traction brake line pulls the rear section of the lower support seat to be lifted. The second traction brake line connects the rear section of the upper support seat to the front section of the lower support seat. When the rear section of the upper support seat is pressed down, the second traction brake line pulls the front section of the lower support seat to be lifted.

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