Lifting device, fan and lifting control method

Abstract

The present invention relates to the technical field of household appliances, and particularly relates to a lifting device, a fan and a lifting control method. The lifting device comprises: a column, the bottom end of which is adapted to be fixedly connected to a chassis; a telescopic rod, the top end of which is adapted to mount a machine head, the telescopic rod is sleeved outside the column, and a first limiting part is arranged inside the bottom end of the telescopic rod; a nut structure fixedly arranged at the top end of the column, the nut structure comprises a second limiting part surrounding the outside of the top end of the column, when the telescopic rod rises to the highest position, the first limiting part abuts against the second limiting part; a screw rod, which is in threaded connection with the nut structure; a driving device fixedly arranged at the top end of the telescopic rod and fixedly connected to the end of the screw rod. When the telescopic rod rises to the highest position, the first limiting part abuts against the second limiting part, which can prevent the telescopic rod from rising further and ensure the stability of the whole device.

Description

Technical Field

[0001] The present invention relates to the technical field of household electrical appliances, and in particular to a lifting device, a fan, and a lifting control method. Background Art

[0002] Currently, the lifting structures of electric fans on the market are mostly complex and difficult to assemble, and usually need to be manually lifted, which is inconvenient to operate. For some structures that can achieve automatic lifting, the drive device is generally fixed to the chassis, so that the connection wiring between the drive device and the top head-related electrical components such as the fan drive motor needs to pass through the moving parts that achieve lifting. During the lifting process, the wiring's extension and contraction swing may interfere with the moving parts and cause abnormalities. At the same time, the wiring needs to extend and retract with the lifting, which will pull the wires and cause damage. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the wiring extension and extension swing of the lifting device during the lifting movement will interfere with the moving parts, thereby providing a lifting device, fan and lifting control method that can avoid the interference between the wiring and the moving parts and ensure the reliability of the wiring.

[0004] In order to solve the above technical problems, the present invention provides a lifting device, including: a column, the bottom end of which is suitable for being fixedly connected to the chassis; a telescopic rod, the top end of which is suitable for installing a machine head, the telescopic rod is sleeved on the outside of the column, and a first limiting portion is provided on the inner side of the bottom end of the telescopic rod; a nut structure, fixedly arranged at the top end of the column, the nut structure including a second limiting portion surrounding the outside of the top end of the column, when the telescopic rod rises to the highest position, the first limiting portion and the second limiting portion are abutted against each other; a screw rod, the screw rod and the nut structure are connected by threaded cooperation; a driving device, fixedly arranged at the top end of the telescopic rod and fixedly connected to the end of the screw rod.

[0005] Optionally, the first limiting portion includes a plurality of first limiting ribs spaced apart on the inner wall of the telescopic rod, and the first limiting ribs are loosely fitted with the column.

[0006] Optionally, the screw includes a threaded section provided with threads and a connecting section located at at least one end of the threaded section, the threaded section is cooperatively connected with the nut structure, and the lifting device further includes:

[0007] A shaft sleeve is fixed on the telescopic rod, and the shaft sleeve is provided with a first through hole that is clearance-matched with the connecting section. The connecting section passes through the first through hole and is fixedly connected to the driving device. When the telescopic rod descends to the lowest position, the shaft sleeve abuts against the nut structure.

[0008] Optionally, a plurality of positioning points are provided on the telescopic rod, and a plurality of positioning holes are provided on the shaft sleeve. The positioning holes are aligned with the positioning points one by one and are connected by screws.

[0009] Optionally, the lifting device further includes a coupling. One end of the coupling is connected to the drive shaft of the drive device, and the other end is connected to the screw rod.

[0010] Optionally, the screw rod further includes a flat portion provided at one end of the connecting section away from the threaded section. A flat hole is provided on the coupling, and the flat portion is inserted into the flat hole.

[0011] Optionally, a first mating portion is provided on the outer wall of the column, and a second mating portion is provided on the inner wall of the telescopic rod. The first mating portion or the second mating portion extends in the vertical direction, and the first mating portion and the second mating portion are in sliding fit.

[0012] Optionally, the first mating portion is a guide rail groove, and the second mating portion is two guide rail ribs spaced circumferentially along the telescopic rod. The two guide rail ribs are respectively in sliding fit with the two groove walls of the guide rail groove.

[0013] Optionally, a guiding inclined surface is provided at the bottom end of the guide rail groove, and the guiding inclined surface can guide the guide rail rib to be installed into the guide rail groove.

[0014] Optionally, a mounting plate is provided inside the column. The mounting plate is close to the top end of the column. A convex block is provided on the inner wall of the column at a position above the mounting plate. A second through hole is provided on the mounting plate, and the screw rod is adapted to pass through the second through hole. The nut structure includes:

[0015] A nut provided on the mounting plate. A notch for cooperating with the convex block is provided on the nut;

[0016] A nut cover connected to the nut and fixed on the mounting plate. The nut cover includes the second limiting portion.

[0017] Optionally, the nut includes a main body portion abutting against the upper surface of the mounting plate and a first connecting portion provided at the lower end of the main body portion. The first connecting portion is adapted to be embedded in the second through hole.

[0018] Optionally, the nut further includes a second connecting portion provided at the upper end of the main body portion. The nut cover includes a cover body and the second limiting portion provided at the edge of the cover body and extending downward. A third through hole is provided on the cover body, and the nut cover is sleeved outside the second connecting portion through the third through hole.

[0019] Optionally, the nut cover further includes an annular connecting portion disposed on the lower surface of the cover body and extending downward, and the annular connecting portion is embedded in the gap between the main body portion and the inner wall of the column.

[0020] Optionally, ribs are provided on the outer wall of the second limiting portion, and the ribs are in clearance fit with the inner wall of the telescopic rod.

[0021] The present invention also provides a fan, including the lifting device described above.

[0022] The present invention also provides a lifting control method, which is applied to the lifting device or the fan described above, and the lifting control method includes:

[0023] Obtain the initial position, the upper boundary of the stroke and the lower boundary of the stroke of the telescopic rod;

[0024] Determine the standard rising duration and the standard falling duration of the telescopic rod according to the initial position, the upper boundary of the stroke and the lower boundary of the stroke;

[0025] Control the lifting height of the telescopic rod according to the standard rising duration and the standard falling duration.

[0026] Optionally, controlling the lifting height of the telescopic rod according to the standard rising duration and the standard falling duration includes:

[0027] Obtain the actual rising duration of the telescopic rod;

[0028] When the actual rising duration reaches the standard rising duration, control the telescopic rod to stop rising;

[0029] When the actual rising duration does not reach the standard rising duration and a first stop signal is received, control the telescopic rod to stop rising.

[0030] Optionally, controlling the lifting height of the telescopic rod according to the standard rising duration and the standard falling duration further includes:

[0031] Obtain the actual falling duration of the telescopic rod;

[0032] When the actual falling duration reaches the standard falling duration, control the telescopic rod to stop falling;

[0033] When the actual falling duration does not reach the standard falling duration and a second stop signal is received, control the telescopic rod to stop falling.

[0034] Optionally, determining the standard rising duration and the standard falling duration of the telescopic rod according to the initial position, the upper boundary of the stroke and the lower boundary of the stroke includes:

[0035] Obtain the moving speed of the telescopic rod;

[0036] Determine the standard rising duration and standard falling duration of the telescopic rod according to the initial position, the upper boundary of the stroke, the lower boundary of the stroke, and the moving speed of the telescopic rod.

[0037] The technical solution of the present invention has the following advantages:

[0038] For the lifting device provided by the present invention, when the driving device works, it drives the screw to rotate. Since the screw and the nut structure are connected by thread fit, and the nut structure is fixed at the top of the column, the screw can move up and down relative to the nut structure, and drive the telescopic rod to move up and down relative to the column during the up and down movement. Since the driving device is arranged at the top of the telescopic rod, the wire for supplying power to the driving device and the machine head can be arranged at the upper end of the telescopic rod, so that the wire is spaced from the lifting device in space, avoiding the situation of interference and abnormality between the wire and the lifting device. At the same time, the wire and the machine head are in a relatively static state, and the wire does not need to stretch with the lifting, ensuring the reliability of the fixed wire. At the same time, when the telescopic rod rises to the highest position, the first limiting part abuts against the second limiting part, which can prevent the telescopic rod from rising further and ensure the stability of the whole device. Description of the Drawings

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic structural diagram of the lifting device provided in Embodiment 1 of the present invention;

[0041] Figure 2 For Figure 1 exploded view;

[0042] Figure 3 It is a cross-sectional view of the lifting device when the telescopic rod descends to the lowest position;

[0043] Figure 4 For Figure 3 partial enlarged view;

[0044] Figure 5 It is a cross-sectional view of the lifting device when the telescopic rod rises to the highest position;

[0045] Figure 6 For Figure 5 partial enlarged view;

[0046] Figure 7 is Figure 5 a partially enlarged view;

[0047] Figure 8 is a sectional view of the connection between the nut cover and the telescopic rod;

[0048] Figure 9 is a sectional view of the connection between the column and the telescopic rod;

[0049] Figure 10 is a structural schematic diagram of the driving device;

[0050] Figure 11 is a structural schematic diagram of the screw rod;

[0051] Figure 12 is a structural schematic diagram of the nut;

[0052] Figure 13 is a structural schematic diagram of the telescopic rod;

[0053] Figure 14 is a structural schematic diagram of the column;

[0054] Figure 15 is a structural schematic diagram of the bushing;

[0055] Figure 16 is a structural schematic diagram of the nut cover;

[0056] Figure 17 is a structural schematic diagram of the coupling;

[0057] Figure 18 is a schematic diagram of the fan provided in Embodiment 2 of the present invention when the machine head is at the lowest position;

[0058] Figure 19 is a schematic diagram of the fan provided in Embodiment 2 of the present invention when the machine head is at the highest position;

[0059] Explanation of reference numerals:

[0060] 1. Driving device; 11. Driving shaft; 2. Screw; 21. Threaded section; 22. Connection section; 23. Flattened part; 3. Nut; 31. Notch; 32. Main body part; 33. First connection part; 34. Second connection part; 4. Telescopic rod; 41. First limiting part; 42. Positioning point; 43. First hollow rod section; 44. Second hollow rod section; 45. Guide rib; 5. Column; 51. Guide groove; 52. Guide inclined plane; 53. Mounting plate; 54. Protrusion; 55. Second through hole; 6. Bush; 61. First through hole; 62. Positioning hole; 63. First shaft section; 64. Second shaft section; 7. Nut cover; 71. Second limiting part; 72. Cover body; 73. Third through hole; 74. Annular connection part; 75. Rib; 8. Coupling; 81. Flattened hole; 9. Chassis; 10. Machine head. Detailed implementation manner

[0061] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0063] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0065] Embodiment 1

[0066] In the current market, the lifting structures of electric fans are mostly complex in structure and difficult to assemble. Usually, they need to be lifted manually, which is inconvenient to operate. For some structures that can achieve automatic lifting, the driving device is generally fixed to the chassis part. As a result, the connection wires of the driving device and the electrical components at the top head, such as the fan blade driving motor, need to pass through the moving parts that realize the lifting. During the lifting process, the stretching and swinging of the wires may interfere with the moving parts, causing abnormalities. At the same time, the wires need to stretch and contract with the lifting, which will pull the wires and cause damage.

[0067] For this reason, this embodiment provides a lifting device.

[0068] In one embodiment, as Figures 1 to 17 shown, the lifting device includes a column 5, a telescopic rod 4, a nut structure, a screw rod 2, and a driving device 1.

[0069] Among them, the bottom end of the column 5 is adapted to be fixedly connected to the chassis 9; the top end of the telescopic rod 4 is adapted to install the head 10. The telescopic rod 4 is sleeved outside the column 5, and a first limiting portion 41 is provided inside the bottom end of the telescopic rod 4; the nut structure is fixedly arranged at the top end of the column 5. The nut structure includes a second limiting portion 71 surrounding the outside of the top end of the column 5. When the telescopic rod 4 rises to the highest position, the first limiting portion 41 abuts against the second limiting portion 71; the screw rod 2 is connected to the nut structure through a threaded fit; the driving device 1 is fixedly arranged at the top end of the telescopic rod 4 and fixedly connected to the end of the screw rod 2.

[0070] In this embodiment, when the driving device 1 works, it drives the screw rod 2 to rotate. Since the screw rod 2 is connected to the nut structure through a threaded fit, and the nut structure is fixed to the top end of the column 5, the screw rod 2 can move up and down relative to the nut structure, and drive the telescopic rod 4 to move up and down relative to the column 5 during the up and down movement. Since the driving device 1 is arranged at the top end of the telescopic rod 4, the wires for supplying power to the driving device 1 and the head 10 can be arranged at the upper end of the telescopic rod 4, so that the wires are spaced apart from the lifting device in space, avoiding the situation of interference and abnormality between the wires and the lifting device. At the same time, the wires and the head 10 are in a relatively static state, and the wires do not need to stretch and contract with the lifting, ensuring the reliability of the fixed wires. At the same time, when the telescopic rod 4 rises to the highest position, the first limiting portion 41 abuts against the second limiting portion 71, which can prevent the telescopic rod 4 from rising further and ensure the stability of the whole device.

[0071] On the basis of the above embodiment, in a preferred embodiment, the first limiting portion 41 extends vertically upward from the bottom end of the telescopic rod 4. In this embodiment, the first limiting portion 41 has a certain height. Therefore, when the telescopic rod 4 rises to the highest position, the telescopic rod 4 still has a long part sleeved outside the column 5, so as to further ensure the stability of the whole device.

[0072] On the basis of the above-described embodiments, in a preferred embodiment, as Figure 9 and Figure 13 shown, the first limiting portion 41 includes a plurality of first limiting ribs that are spaced apart on the inner wall of the telescopic rod 4, and the first limiting ribs are in clearance fit with the column 5. In this embodiment, during the lifting movement of the telescopic rod 4, the first limiting portion 41 is in clearance fit with the column 5, and the first limiting ribs can limit and guide the lifting movement of the telescopic rod 4, ensuring the smoothness of the lifting movement. In the prior art, there are some structures that use the cooperation of the screw rod 2 and the nut 3 to achieve lifting. Generally, two bearings are used to limit the two ends of the screw rod 2 to ensure the stability of the transmission. However, this method is inconvenient for installing the bearings and has a high cost. In this embodiment, the lifting movement of the telescopic rod 4 is limited and guided by the first limiting ribs. Compared with the prior art, the setting of bearings is reduced, the cost can be reduced, and the installation is convenient at the same time.

[0073] On the basis of the above-described embodiments, in a preferred embodiment, as Figure 11 shown, the screw rod 2 includes a threaded section 21 provided with threads and a connecting section 22 located at at least one end of the threaded section 21. The threaded section 21 is connected to the nut structure in a mating manner. The lifting device further includes a bushing 6, the bushing 6 is fixed on the telescopic rod 4, the bushing 6 is provided with a first through hole 61 that is in clearance fit with the connecting section 22, the connecting section 22 passes through the first through hole 61 and is fixedly connected to the driving device 1. When the telescopic rod 4 descends to the lowest position, the bushing 6 abuts against the nut structure. In this embodiment, by providing the bushing 6, when the telescopic rod 4 descends to the lowest position, the bushing 6 abuts against the nut structure, thereby preventing the telescopic rod 4 from continuing to descend, and the bushing 6 can limit one end of the screw rod 2. Compared with using a bearing to limit the screw rod 2 in the prior art, the cost can be reduced and the installation is convenient at the same time.

[0074] On the basis of the above-described embodiments, in a preferred embodiment, a plurality of positioning points 42 are provided on the telescopic rod 4, and a plurality of positioning holes 62 are provided on the bushing 6. The positioning holes 62 are aligned with the positioning points 42 one by one and are connected by screws. As Figure 13 shown, the telescopic rod 4 includes a first hollow rod section 43 and a second hollow rod section 44, wherein the second hollow rod section 44 is located above the first hollow rod section 43, the outer diameter of the second hollow rod section 44 is larger than the outer diameter of the first hollow rod section 43, and an annular step surface is formed between the second hollow rod section 44 and the first hollow rod section 43. The positioning points 42 are provided on the annular step surface; again, as Figure 15As shown, the bushing 6 includes a first shaft section 63 and a second shaft section 64. The outer diameter of the first shaft section 63 is greater than that of the second shaft section 64. A relatively large annular installation space is formed at the center of the first shaft section 63, which facilitates the connection between the driving device 1 and the screw 2. Specifically, the coupling 8 connecting the screw 2 and the driving device 1 is located within the annular installation space. A first through hole 61 adapted for the screw 2 to pass through is provided at the center of the second shaft section 64. A positioning hole 62 is provided on the first shaft section 63, and the first shaft section 63 is supported on the annular step surface. In this embodiment, a number of positioning points 42 are pre - provided on the telescopic rod 4, and a number of positioning holes 62 are provided on the bushing 6, which facilitates the quick and accurate fixing of the bushing 6 on the telescopic rod 4.

[0075] Based on the above - mentioned embodiment, in a preferred embodiment, the lifting device further includes a coupling 8. One end of the coupling 8 is connected to the driving shaft 11 of the driving device 1, and the other end is connected to the screw 2. In this embodiment, the setting of the coupling 8 facilitates the connection between the screw 2 and the driving device 1. Specifically, the driving device 1 is a motor. One end of the coupling 8 is connected to the driving shaft 11 of the motor, and the other end is connected to the screw 2. In an alternative embodiment, the screw 2 is directly connected to the driving shaft 11 of the driving device 1.

[0076] Based on the above - mentioned embodiment, in a preferred embodiment, as Figure 11 and Figure 17 shown, the screw 2 further includes a flat portion 23 provided at one end of the connecting section 22 away from the threaded section 21. A flat hole 81 is provided on the coupling 8, and the flat portion 23 is inserted into the flat hole 81. In this embodiment, the connection method between the screw 2 and the coupling 8 is simple and convenient, and it can ensure that there is no relative rotation between the screw 2 and the coupling 8.

[0077] Based on the above - mentioned embodiment, in a preferred embodiment, a first mating portion is provided on the outer wall of the column 5, and a second mating portion is provided on the inner wall of the telescopic rod 4. The first mating portion or the second mating portion extends in the vertical direction, and the first mating portion and the second mating portion are in sliding fit. In this embodiment, the settings of the first mating portion and the second mating portion can guide the lifting movement of the telescopic rod 4, so that the telescopic rod 4 can only move circumferentially relative to the column 5 and cannot rotate relative to it.

[0078] Based on the above - mentioned embodiment, in a preferred embodiment, in combination with Figure 13 and Figure 14, the first mating part is the guide rail groove 51, and the second mating part is two guide rail ribs 45 arranged at intervals along the circumference of the telescopic rod 4. The two guide rail ribs 45 are respectively in sliding fit with the two groove walls of the guide rail groove 51. In this embodiment, the second mating part is two spaced guide rail ribs 45, which has a more beautiful appearance and can reduce the overall weight of the telescopic rod 4. In an alternative embodiment, the first mating part is the guide rail groove 51, and the second mating part is a slider arranged on the inner wall of the telescopic rod 4, and the slider is slidably arranged in the guide rail groove 51. In another alternative embodiment, the first mating part is a slider, and the second mating part is the guide rail groove 51, and the guide rail groove 51 can slide relative to the slider.

[0079] Based on the above embodiments, in a preferred embodiment, as Figure 14 shown, a guiding inclined surface 52 is provided at the bottom end of the guide rail groove 51, and the guiding inclined surface 52 can guide the guide rail rib 45 to be installed into the guide rail groove 51. In this embodiment, the provision of the guiding inclined surface 52 can guide the guide rail rib 45 to be smoothly installed into the guide rail groove 51. Of course, in other alternative embodiments, the guiding inclined surface 52 may not be provided.

[0080] Based on the above embodiments, in a preferred embodiment, with further reference to Figure 14 , an installation plate 53 is provided inside the column 5. The installation plate 53 is close to the top end of the column 5. A convex block 54 is provided on the inner wall of the column 5 at a position above the installation plate 53. A second through hole 55 is provided on the installation plate 53. The screw 2 is adapted to pass through the second through hole 55. The nut structure includes a nut 3 and a nut cover 7. The nut 3 is provided on the installation plate 53. A notch 31 for cooperating with the convex block 54 is provided on the nut 3. The nut cover 7 is connected to the nut 3 and fixed on the installation plate 53. The nut cover 7 includes a second limiting part 71. In this embodiment, since a notch 31 for cooperating with the convex block 54 on the inner wall of the column 5 is provided on the nut 3, the nut 3 and the column 5 are connected by the cooperation of the convex block 54 and the notch 31, which can ensure that the nut 3 will not rotate relative to the column 5, so that it can ensure that the screw 2 moves up and down relative to the nut 3 when rotating. At the same time, the nut cover 7 can easily fix the nut 3 on the column 5.

[0081] Based on the above embodiments, in a preferred embodiment, the nut 3 includes a main body part 32 abutted against the upper surface of the installation plate 53 and a first connecting part 33 provided at the lower end of the main body part 32. The first connecting part 33 is adapted to be embedded in the second through hole 55. In this embodiment, during installation, after aligning the notch 31 of the nut 3 with the convex block 54 on the inner wall of the column 5, inserting the first connecting part 33 of the nut 3 into the second through hole 55 on the installation plate 53 can further ensure the connection stability between the nut 3 and the column 5. Of course, in other alternative embodiments, the nut 3 may not include the first connecting part 33 and only includes the main body part 32.

[0082] On the basis of the above-described embodiment, in a preferred embodiment, the nut 3 further includes a second connecting portion 34 provided at the upper end of the main body portion 32. The nut cover 7 includes a cover body 72 and a second limiting portion 71 provided at the edge of the cover body 72 and extending downward. A third through hole 73 is provided in the cover body 72, and the nut cover 7 is sleeved outside the second connecting portion 34 through the third through hole 73. In this embodiment, the nut cover 7 is sleeved on the nut 3 through its third through hole 73, which can further ensure that the nut cover 7 can stably fix the nut 3 on the column 5.

[0083] On the basis of the above-described embodiment, in a preferred embodiment, the nut cover 7 further includes an annular connecting portion 74 provided on the lower surface of the cover body 72 and extending downward. The annular connecting portion 74 is embedded in the gap between the main body portion 32 and the inner wall of the column 5. In this embodiment, it can further ensure the stable connection between the nut cover 7 and the nut 3, so that after the nut cover 7 is fixed on the column 5, the nut 3 can be fixed.

[0084] On the basis of the above-described embodiment, in a preferred embodiment, ribs 75 are provided on the outer wall of the second limiting portion 71, and the ribs 75 are in clearance fit with the inner wall of the telescopic rod 4. In this embodiment, by providing the ribs 75 on the outer wall of the second limiting portion 71, the smoothness of the transmission can be further ensured. Compared with the traditional use of two bearings, the assembly is simplified and the cost is saved.

[0085] In the lifting device provided in this embodiment, during assembly, first, the thread on the screw rod 2 is screwed into the threaded hole of the nut 3, so as to assemble the nut 3 outside the screw rod 2. Then, the notch 31 on the nut 3 is aligned with the convex block 54 on the inner wall of the column 5, and the screw rod 2 is passed through the second through hole 55 on the mounting plate 53 and the first connecting portion 33 of the nut 3 is embedded in the second through hole 55. The main body portion 32 of the nut 3 abuts against the upper surface of the mounting portion. Then, the third through hole 73 of the nut cover 7 is sleeved outside the second connecting portion 34 of the nut 3, and the nut cover 7 is fixed on the mounting plate 53 by screws. Thus, the nut 3 is completely fixed on the column 5. After that, the assembled column 5 together with the screw rod 2 is inserted into the telescopic rod 4: First, the lower end of the column 5 is inserted into the telescopic rod 4 from the upper end of the telescopic rod 4, and the guide rib 45 on the inner wall of the telescopic rod 4 is inserted into the guide groove 51 outside the column 5 through the guiding inclined surface 52 at the bottom end of the guide groove 51 of the column 5, so that only axial movement can occur between the telescopic rod 4 and the column 5 and relative rotation is impossible. Then, the first through hole 61 of the shaft sleeve 6 is sleeved outside the connecting section 22 of the screw rod 2, the positioning hole 62 on the shaft sleeve 6 is aligned with the positioning point 42 on the telescopic rod 4 and the screw is tightened, so as to fix the shaft sleeve 6 on the telescopic rod 4. Then, the flat hole 81 of the coupling 8 is sleeved on the flat portion 23 of the screw rod 2, so as to assemble the coupling 8 on the screw rod 2. Finally, the driving shaft 11 of the driving device 1 is fixedly installed on the coupling 8 and the screw is tightened to fix the driving device 1 on the telescopic rod 4. Thus, the assembly of the lifting device is completed. When the lifting device needs to be installed on the whole fan, only the chassis 9 needs to be fixedly installed at the bottom of the column 5 and the machine head 10 needs to be fixedly installed at the top of the telescopic rod 4.

[0086] After the driving device 1 is powered on, the driving shaft 11 rotates, drives the screw rod 2 to rotate through the coupling 8. The nut 3 is fixed to the column 5 and does not move. Under the action of the internal thread of the nut 3, the screw rod 2 moves axially relative to the nut 3, driving the telescopic rod 4 to move axially, realizing the axial reciprocating movement of the telescopic rod 4. When the telescopic rod 4 moves to the highest point, the lower end of the second limiting portion 71 of the nut cover 7 abuts against the top end of the first limiting rib on the inner side of the bottom end of the telescopic rod 4 and cannot move upward continuously. When the telescopic rod 4 moves to the lowest point, the lower end of the shaft sleeve 6 abuts against the upper end surface of the nut cover 7 and cannot move downward continuously. Since the driving device 1 is fixed to the top of the telescopic rod 4, the connection wiring between the driving device 1 and the machine head 10 is well separated from the screw rod 2 and the nut 3 and will not interfere during the movement process. At the same time, the wiring remains stationary during the lifting process and does not need to be telescoped, so the situation of pulling the wiring will not occur and the wiring reliability is good.

[0087] Embodiment 2

[0088] This embodiment provides a fan, such as Figure 18 and Figure 19As shown in the figure, it includes the lifting device provided in the above embodiment. The chassis 9 is fixedly installed at the bottom of the column 5, and the machine head 10 is fixedly installed at the top of the telescopic rod 4.

[0089] Embodiment 3

[0090] This embodiment provides a lifting control method, which is applied to the lifting device provided in Embodiment 1 or the fan provided in Embodiment 2.

[0091] In one embodiment, the lifting control method includes the following steps:

[0092] S1. Obtain the initial position, the upper boundary of the stroke, and the lower boundary of the stroke of the telescopic rod 4. Among them, the initial position refers to the position where the bottom of the telescopic rod 4 is located when the fan is started. The upper boundary of the stroke refers to the highest position that the telescopic rod 4 can reach, that is, the height of the telescopic rod 4 when the first limiting part 41 and the second limiting part 71 are in contact. The lower boundary of the stroke refers to the lowest position that the telescopic rod 4 can reach;

[0093] S2. Determine the standard rising duration and the standard falling duration of the telescopic rod 4 according to the initial position, the upper boundary of the stroke, and the lower boundary of the stroke;

[0094] S3. Control the lifting height of the telescopic rod 4 according to the standard rising duration and the standard falling duration. Specifically, the telescopic rod 4 can be controlled to rise by making the motor rotate forward, and the telescopic rod 4 can be controlled to fall by making the motor rotate in reverse.

[0095] In this embodiment, controlling the lifting height of the telescopic rod 4 according to the standard rising duration and the standard falling duration can reduce the number of travel switches, make the assembly more convenient, and lower the cost compared with the traditional control method of cutting off the power supply of the driving device 1 by using travel switches.

[0096] In a preferred embodiment, the above step S3 includes:

[0097] S31. Obtain the actual rising duration of the telescopic rod 4;

[0098] S32. When the actual rising duration reaches the standard rising duration, control the telescopic rod 4 to stop rising. When the actual rising duration reaches the standard rising duration, it means that it has risen to the upper boundary of the stroke, then control the driving device 1 to cut off the power supply, and the telescopic rod 4 stops rising;

[0099] S32. When the actual rising duration does not reach the standard rising duration and the first stop signal is received, control the telescopic rod 4 to stop rising. In this step, when the first stop signal is received before the telescopic rod 4 rises to the upper boundary of the stroke, controlling the telescopic rod 4 to stop rising can make the telescopic rod 4 stop at any position, and with the self-locking of the screw 2 and the nut 3 itself, stepless adjustment of the lifting height can be achieved.

[0100] In a preferred embodiment, the above step S3 further includes:

[0101] S33. Obtain the actual descending duration of the telescopic rod 4;

[0102] S34. When the actual descending duration reaches the standard descending duration, control the telescopic rod 4 to stop descending. When the actual descending duration reaches the standard descending duration, it indicates that it has descended to the lower boundary of the stroke, then control the driving device 1 to cut off the power supply, and the telescopic rod 4 stops descending;

[0103] S35. When the actual descending duration does not reach the standard descending duration and the second stop signal is received, control the telescopic rod 4 to stop descending. In this step, when the second stop signal is received before the telescopic rod 4 descends to the lower boundary of the stroke, controlling the telescopic rod 4 to stop descending can make the telescopic rod 4 stop at any position, and with the self-locking of the screw rod 2 and the nut 3 itself, stepless adjustment of the lifting height can be achieved.

[0104] In a preferred embodiment, the above step S2 includes:

[0105] S21. Obtain the moving speed of the telescopic rod 4. Specifically, when the screw rod 2 rotates at a constant speed, its moving speed is also determined. The moving speed of the screw rod 2 is the moving speed v of the telescopic rod 4. The ascending and descending speeds of the telescopic rod 4 are equal, both being v;

[0106] S22. Determine the standard ascending duration and standard descending duration of the telescopic rod 4 according to the initial position, the upper boundary of the stroke, the lower boundary of the stroke, and the moving speed of the telescopic rod 4. Define the distance between the upper boundary and the lower boundary of the stroke as L, and the initial position of the telescopic rod 4 as x, where 0 ≤ x ≤ L. Then the standard ascending duration is (L - x) / v, and the standard descending duration is x / v.

[0107] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A lifting device, characterized in that, Comprising: A column (5), the bottom end of which is adapted to be fixedly connected to a chassis (9); A telescopic rod (4), the top end of which is adapted to mount a machine head (10), the telescopic rod (4) is sleeved outside the column (5), and a first limiting portion (41) is provided inside the bottom end of the telescopic rod (4); A nut structure fixedly provided at the top end of the column (5), the nut structure includes a second limiting portion (71) surrounding the outside of the top end of the column (5), when the telescopic rod (4) rises to the highest position, the first limiting portion (41) abuts against the second limiting portion (71); A screw rod (2), the screw rod (2) is connected to the nut structure by a threaded fit; A driving device (1) fixedly provided at the top end of the telescopic rod (4) and fixedly connected to the end of the screw rod (2); an installation plate (53) is provided inside the column (5), the installation plate (53) is close to the top end of the column (5), a convex block (54) is provided on the inner wall of the column (5) at a position above the installation plate (53), a second through hole (55) is provided on the installation plate (53), the screw rod (2) is adapted to pass through the second through hole (55), and the nut structure includes: A nut (3) provided on the installation plate (53), the nut (3) is provided with a notch (31) for cooperating with the convex block (54); A nut cover (7) connected to the nut (3) and fixed on the installation plate (53), the nut cover (7) includes the second limiting portion (71); The nut (3) includes a main body portion (32) abutting against the upper surface of the installation plate (53) and a first connecting portion (33) provided at the lower end of the main body portion (32), the first connecting portion (33) is adapted to be embedded in the second through hole (55), the nut (3) further includes a second connecting portion (34) provided at the upper end of the main body portion (32), the nut cover (7) includes a cover body (72) and the second limiting portion (71) provided at the edge of the cover body (72) and extending downward, a third through hole (73) is provided on the cover body ( 2. The lifting device according to claim 1, wherein ​ 3. The lifting device according to claim 1, characterized in that, ​ The bushing (6) is fixed on the telescopic rod (4). The bushing (6) is provided with a first through hole (61) which has a clearance fit with the connecting section (22). The connecting section (22) passes through the first through hole (61) and is fixedly connected with the driving device (1). When the telescopic rod (4) descends to the lowest position, the bushing (6) abuts against the nut structure.

4. The lifting device according to claim 3, wherein, A number of positioning points (42) are provided on the telescopic rod (4), and a number of positioning holes (62) are provided on the bushing (6). The positioning holes (62) are aligned with the positioning points (42) one by one and are connected by screws.

5. The lifting device according to claim 3, characterized in that, The lifting device further includes a coupling (8). One end of the coupling (8) is connected to the driving shaft (11) of the driving device (1), and the other end is connected to the screw rod (2).

6. The lifting device according to claim 5, characterized in that, The screw rod (2) further includes a flat portion (23) provided at one end of the connecting section (22) away from the threaded section (21). The coupling (8) is provided with a flat hole (81), and the flat portion (23) is inserted into the flat hole (81).

7. The lifting device according to claim 1, characterized in that, A first mating portion is provided on the outer wall of the column (5), and a second mating portion is provided on the inner wall of the telescopic rod (4). The first mating portion or the second mating portion extends in the vertical direction, and the first mating portion and the second mating portion are in sliding fit.

8. The lifting device according to claim 7, characterized in that, The first mating portion is a guide rail groove (51), and the second mating portion is two guide rail ribs (45) arranged at intervals along the circumference of the telescopic rod (4). The two guide rail ribs (45) are respectively in sliding fit with the two groove walls of the guide rail groove (51).

9. The lifting device according to claim 8, wherein A guiding inclined surface (52) is provided at the bottom end of the guide rail groove (51), and the guiding inclined surface (52) can guide the guide rail rib (45) to be installed into the guide rail groove (51).

10. The lifting device according to any one of claims 1-9, characterized in that, Ribs (75) are provided on the outer wall of the second limiting portion (71), and the ribs (75) have a clearance fit with the inner wall of the telescopic rod (4).

11. A fan, characterized in that, Including the lifting device according to any one of claims 1 - 10.

12. A lifting control method, characterized in that, Applied to the lifting device according to any one of claims 1 - 10 or the fan according to claim 11, the lifting control method includes: Obtaining the initial position, the upper boundary of the stroke and the lower boundary of the stroke of the telescopic rod (4); Determining the standard rising duration and the standard falling duration of the telescopic rod (4) according to the initial position, the upper boundary of the stroke and the lower boundary of the stroke; Controlling the lifting height of the telescopic rod (4) according to the standard rising duration and the standard falling duration.

13. The lifting control method according to claim 12, wherein, Controlling the lifting height of the telescopic rod (4) according to the standard rising duration and the standard falling duration includes: Obtaining the actual rising duration of the telescopic rod (4); When the actual rising duration reaches the standard rising duration, controlling the telescopic rod (4) to stop rising; When the actual rising duration does not reach the standard rising duration and a first stop signal is received, controlling the telescopic rod (4) to stop rising.

14. The lifting control method according to claim 13, wherein Controlling the lifting height of the telescopic rod (4) according to the standard rising duration and the standard falling duration further includes: Obtaining the actual falling duration of the telescopic rod (4); When the actual descending duration reaches the standard descending duration, control the telescopic rod (4) to stop descending; When the actual descending duration does not reach the standard descending duration and a second stop signal is received, control the telescopic rod (4) to stop descending.

15. The lifting control method according to claim 13, wherein Determining the standard ascending duration and the standard descending duration of the telescopic rod (4) according to the initial position, the upper boundary of the stroke, and the lower boundary of the stroke includes: Obtaining the moving speed of the telescopic rod (4); Determining the standard ascending duration and the standard descending duration of the telescopic rod (4) according to the initial position, the upper boundary of the stroke, the lower boundary of the stroke, and the moving speed of the telescopic rod (4).

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