A linear drive device, a smart home product

Abstract

This utility model relates to the field of linear drive device technology, and provides a linear drive device and a smart home product, including a drive device body and a drive unit. The drive device body includes a nested tube assembly and a drive assembly, with the drive assembly disposed within the tube assembly. The drive unit drives the tube assembly to extend and retract through the drive assembly. The drive unit includes a motor, a first reduction mechanism, a second reduction mechanism, and a signal switch. The motor is driven by the first reduction mechanism, which is driven by the drive assembly. The second reduction mechanism is driven by either the motor or the first reduction mechanism. The output end of the second reduction mechanism is provided with a signal triggering mechanism. When the drive unit is installed in the drive device body, the drive unit is set to an initial state, and the height of the drive device body is the set initial height. This utility model avoids the adverse effects of motor stalling caused by hard contact in the internal drive structure of the linear drive device.

Description

Technical Field

[0001] This utility model relates to the field of linear drive device technology, specifically to a linear drive device and a smart home product. Background Technology

[0002] Linear drive mechanisms are widely used in smart home products such as electric desks, electric beds, height-adjustable cabinets, and height-adjustable TV brackets. For example, applying linear drive mechanisms to desks enables adjustable desktop height, providing a new way for office workers to alternate between standing and sitting; applying linear drive mechanisms to bed frames allows for free adjustment of the bed board's curvature, better adapting to the human lying posture. With people's increasing pursuit of healthy living, the market demand for smart home products is also growing.

[0003] Taking an electric desk as an example, an electric desk typically consists of a desktop, a frame assembly, a lifting column (i.e., a linear drive device), legs, and a control unit (control box, hand controller, etc.). The control unit controls the lifting column to raise and lower the desk. After assembly, the electric desk usually needs to be initialized to allow the control unit to recognize its initial height, ensuring the lifting column operates within its travel range. Initialization can be either downward or upward. Downward initialization typically involves the control unit controlling the lifting column to move downwards. When the lifting column reaches its lowest height, a hard contact occurs in the internal drive structure, causing the motor to stall. When the motor current exceeds the threshold set by the control unit, the motor stops working, thus recognizing the initial height and ensuring the desktop is level. Initialization is also usually required when the electric desk experiences collisions, desktop tilting, or requires repair. Conversely, upward initialization involves performing the same operation at the highest point of the lifting column.

[0004] Both initialization methods have their advantages and disadvantages. When initializing upwards, the electric table needs to overcome the weight of the tabletop itself and the load on the tabletop to move upwards. This is compounded by a large motor stall torque at the top, which requires increasing the motor power and improving the strength of the internal components of the lifting column, resulting in higher costs and greater risks. When initializing downwards, the smaller motor stall torque has less adverse effects on the lifting column, but downward initialization is easily affected by the height of other objects under the tabletop (such as immovable cabinets), making it difficult to lower to the lowest point and complete the initialization action.

[0005] Chinese patent CN118216765B discloses a linear drive device with an adjustable minimum height. This device allows for stepless adjustment of the minimum height, enabling end consumers to freely combine furniture with the product without worrying about height issues. However, since consumers are not professional operators, the adjusted heights of the two lifting columns may be inconsistent. Therefore, a more convenient, flexible, and reliable initialization solution is still needed. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a linear drive device and smart home product to solve the initialization problem faced when applying linear drive devices.

[0007] To achieve the above and other objectives, this utility model provides the following technical solution: a linear drive device, comprising a drive device body and a drive unit. The drive device body includes a nested tube assembly and a drive assembly, with the drive assembly disposed within the tube assembly. The drive unit drives the tube assembly to extend and retract via the drive assembly. The drive unit includes a motor, a first reduction mechanism, a second reduction mechanism, and a signal switch. The motor is driven by the first reduction mechanism, which is driven by the drive assembly. The second reduction mechanism is driven by either the motor or the first reduction mechanism. The output end of the second reduction mechanism is provided with a signal triggering mechanism. When the drive unit is installed in the drive device body, the drive unit is set to an initialization state, and the height of the drive device body is set to a predetermined initialization height.

[0008] Furthermore, during the initialization of the drive unit, the drive unit, the detection board, and the control unit are connected in sequence. When the signal triggering mechanism at the output end of the second reduction mechanism triggers the signal switch, the control unit controls the motor to stop running based on the received level signal from the detection board 7.

[0009] Furthermore, the detection board is integrated on the drive unit.

[0010] Furthermore, when the drive unit is installed in the drive device body, the height of the drive device body is set to a set maximum height. The linear drive device moves downward, and the control unit determines, by detecting the Hall signal of the motor, that the motor stops running when the linear drive device reaches a set minimum height; or, when the drive unit is installed in the drive device body, the height of the drive device body is set to a set minimum height. The linear drive device moves upward, and the control unit determines, by detecting the Hall signal of the motor, that the motor stops running when the linear drive device reaches a set maximum height.

[0011] Furthermore, the second reduction mechanism includes an input end and an output end, the motor or the first reduction mechanism is connected to the input end for transmission, and the output end is provided with a signal triggering mechanism.

[0012] Furthermore, the second reduction mechanism also includes a fixed gear ring and planetary gears. The input end has an eccentric cylinder and an external spline, and the connection between the two forms a first step. The eccentric cylinder passes through the fixed gear ring, and the first step abuts against the outer end face of the fixed gear ring. The planetary gears are sleeved on the eccentric cylinder, and the outer teeth of the planetary gears mesh with the fixed gear ring. The output gear ring at the output end is sleeved on the outside of the planetary gears, and the inner teeth of the output gear ring mesh with the outer teeth of the planetary gears.

[0013] Furthermore, the second reduction mechanism has a small tooth difference structure, with the difference in the number of teeth between the fixed gear ring and the output gear ring being 1 to 4.

[0014] Furthermore, the output end includes an end cover and an output gear ring, the output gear ring and the end cover are fixedly connected, and a signal triggering mechanism is provided around the end cover.

[0015] Furthermore, the end cap has a connecting post at its center and a first through hole in the middle of the input end. The connecting post passes through the first through hole of the input end and is fixed by a snap ring.

[0016] Furthermore, the end cap has a connecting post at its center, a first through hole in the middle of the input end, and a buckle at the end of the connecting post. The buckle deforms inward, passes through the first through hole of the input end, and then resets. The buckle engages with the second step of the input end.

[0017] Furthermore, the first reduction mechanism has a worm gear tooth, an internal spline of the worm gear, a worm gear step, and an external spline of the worm gear. The motor is driven by the worm gear tooth, the internal spline of the worm gear is driven by the drive assembly, and the external spline of the worm gear is driven by the second reduction mechanism directly or indirectly.

[0018] Furthermore, the first reduction mechanism has a worm gear tooth and an internal spline of the worm gear, the motor is connected to the worm gear tooth for transmission, the second reduction mechanism meshes with the upper part of the internal spline of the worm gear, and the drive assembly meshes with the lower part of the internal spline of the worm gear.

[0019] Furthermore, the drive unit includes a gearbox, the first reduction mechanism and / or the second reduction mechanism are disposed inside the gearbox, the motor shaft of the motor extends into the gearbox, and the motor shaft is connected to the second reduction mechanism and / or the first reduction mechanism in a transmission connection.

[0020] Furthermore, the gearbox includes a housing and a cover. A first reduction mechanism is disposed inside the housing and enclosed between the housing and the cover. A second reduction mechanism is fixed above the cover. A second through hole is opened in the middle of the cover. The input end of the second reduction mechanism extends into the second through hole of the cover and is connected to the first reduction mechanism for transmission.

[0021] Furthermore, the fixed gear ring of the second deceleration mechanism is fixed to the cover, which has a flange edge.

[0022] Furthermore, there is at least one signal switch, and the number of signal triggering mechanisms corresponds to the number of signal switches. When the number of signal triggering mechanisms is greater than 1, the signal triggering mechanisms are arranged on different horizontal planes.

[0023] Furthermore, the stroke of the linear drive device is L, the drive assembly includes a lead screw with a lead of D, the reduction ratio of the second reduction mechanism is S, the linear drive device completes one full stroke L, and the rotation angle of the output end of the second reduction mechanism is A=[L / (D×S)]×360°, where A<360°.

[0024] A smart home product includes the aforementioned linear drive device.

[0025] By adopting the above technical solution, this utility model has the following beneficial effects:

[0026] 1. This utility model determines whether the initial position has been reached by detecting the on / off state of the signal switch. Compared with the prior art, it avoids the adverse effects of motor stall caused by hard contact in the internal drive structure of the linear drive device, and the strength requirements of the internal components of the linear drive device are relatively reduced.

[0027] 2. Performing initialization at a set height can eliminate the height inconsistency of multiple linear drive devices caused by accumulated errors in the drive structure, facilitating low-cost mass production.

[0028] 3. The drive unit is installed after the initial height is set. During assembly, the initialization operation can be performed at the lowest or highest point according to the application scenario, making the product more adaptable.

[0029] 4. When there are two or more signal switches, multiple signal switches can meet the needs of multiple location identification or functional expansion.

[0030] 5. The second reduction mechanism has fewer parts and a smaller size. In particular, when the fixed gear ring of the second reduction mechanism is integrated into the cover, the structure is compact and the space utilization rate is higher.

[0031] 6. The second reduction mechanism adopts a low tooth difference structure, which can meet the large stroke setting with a large reduction ratio.

[0032] 7. The first and second reduction mechanisms are fixed by the housing to ensure the meshing accuracy between the first and second reduction mechanisms and the drive assembly, thereby reducing vibration, lowering noise, and ensuring smooth operation.

[0033] 8. The cover has a flange edge, which can effectively protect the output end of the signal switch and the second deceleration mechanism, preventing damage from impacts. Attached Figure Description

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] Figure 1 The diagram shown is a structural schematic of the linear drive device of Example 1.

[0036] Figure 2 Shown is an exploded view of the linear drive device of Example 1.

[0037] Figure 3 The diagram shown is the initialization schematic of the drive unit in Example 1.

[0038] Figure 4 The diagram shown is a structural schematic of the drive unit in Embodiment 1.

[0039] Figure 5 The diagram shown is an exploded view of the drive unit of Embodiment 1.

[0040] Figure 6 The diagram shown is a structural schematic of the first deceleration mechanism in Embodiment 1.

[0041] Figure 7 The exploded view shows the second deceleration mechanism of Example 1.

[0042] Figure 8 The diagram shown is a structural schematic of the input end of the second deceleration mechanism in Embodiment 1.

[0043] Figure 9 The diagram shown is a structural schematic of the output end of the second deceleration mechanism in Embodiment 1.

[0044] Figure 10 The diagram shown is an exploded view of the drive unit of Embodiment 3.

[0045] Figure 11 The exploded view shows the second deceleration mechanism of Example 3.

[0046] Figure 12 The diagram shown is a structural schematic of the output end of the second deceleration mechanism in Embodiment 3.

[0047] Figure 13 The diagram shown is a structural schematic of the input end of the second deceleration mechanism in Embodiment 3.

[0048] Figure 14 The diagram shown is an exploded view of the drive unit of Example 4.

[0049] Figure 15The diagram shown is an exploded view of the drive unit of Example 5.

[0050] Explanation of the labels in the diagram:

[0051] Drive unit body 1; drive assembly 11;

[0052] Drive unit 2; motor 21, motor shaft 211; housing 22; first reduction mechanism 23, worm gear teeth 231, worm gear internal spline 232, worm gear step 233, worm gear external spline 234; second reduction mechanism 24, input end 241, eccentric cylinder 2411, external spline 2412, first step 2413, second step 2414, fixed gear ring 242, planetary gear 243, output end 244, end cover 2441, output gear ring 2442, connecting column 2443, signal triggering mechanism 2444, buckle 2445; snap ring 245; signal switch 25; housing cover 26, flange edge 261; detection plate 27. Detailed Implementation

[0053] Please see Figures 1-12 The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0054] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0055] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “a,” “an,” or “the,” as used herein, do not indicate a limitation of quantity, but are merely used to indicate the presence of at least one. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The term “connection,” as used herein, includes both direct and indirect connections unless otherwise specified.

[0056] To avoid confusion with this utility model, some technical features known in the art have not been described.

[0057] Example 1

[0058] Linear drive devices are electromechanical equipment used to achieve linear reciprocating motion, and are widely used in electric lifting cabinets, lifting islands, lifting cabinets, TV lifting brackets, electric desks, and other fields. Taking an electric desk as an example, an electric desk typically consists of a tabletop, a table frame assembly, lifting columns, feet, and a control unit (control box, hand controller, etc.). The control unit controls the lifting columns to move the electric desk up and down.

[0059] In theory, electric desks are manufactured with uniform minimum height of the lifting columns. After assembly and proper electrical connections, the control unit performs an initialization operation to ensure all lifting columns are at the same height, thus leveling the desk surface. This reset method can also be used to troubleshoot tilted surfaces during use. Current technology involves slowly moving the desk upwards to its highest or downwards to its lowest point. At this point, a hard contact occurs in the internal drive structure of the lifting columns, causing the motor to stall. The motor current exceeds the threshold set by the control unit, at which point the desk resets. However, due to the large cumulative error in the lifting column drive structure, ensuring consistent mechanical limit heights during reset is a significant challenge.

[0060] Appendix Figure 1-9 A linear drive device with a stroke of L is provided. When applied to an electric table, the stroke L can reach 400-660mm; when applied to a camera lift bracket, the stroke L can reach 500-800mm; and when applied to other products such as electric beds, the stroke L is even greater. The linear drive device includes a drive device body 1 and a drive unit 2. The drive device body 1 includes a nested tube assembly and a drive assembly 11. The drive assembly 11 is disposed within the tube assembly. The drive unit 2 drives the tube assembly to extend and retract through the drive assembly 11, thereby realizing the height adjustment of the linear drive device. The drive unit 2 includes a motor 21, a housing 22, a first reduction mechanism 23, a second reduction mechanism 24, and a signal switch 25. The motor 21 is driven by the first reduction mechanism 23, which is also driven by the drive assembly 11. The second reduction mechanism 24 is driven by either the motor 21 or the first reduction mechanism 23. The output end 244 of the second reduction mechanism 24 is provided with a signal triggering mechanism 2444. When the signal triggering mechanism 2444 triggers the signal switch 25, the linear drive device stops operating.

[0061] Before assembling the linear drive device in this embodiment, the drive device body 1 and the drive unit 2 are first adjusted to the initialization state. The initialization state of the drive device body 1 means adjusting the height of the drive device body 1 to the initial height. If the downward initialization method is used, the initial height is the set minimum height of the linear drive device; if the upward initialization method is used, the initial height is the set maximum height of the linear drive device.

[0062] like Figure 3 As shown, adjust the drive unit 2 to the initialization state, connect the drive unit 2, detection board 27, and control unit in sequence, keep the signal switch 25 in the normally open (NO) state, control the drive unit 2 to run through the control unit, and use the detection board 27 to detect the high and low levels of the signal to identify the state of the signal switch 25. For example, when the signal switch 25 is not touched, the level signal of the I / O port is defined as a high level signal; when the signal triggering mechanism 2444 triggers the signal switch 25, the level signal of the I / O port is a low level signal. When a low level signal is received, the control unit controls the motor 21 to stop running, and at this time the drive unit 2 is adjusted to the initialization state. Then, install the drive unit 2 into the drive device body 1 to complete the assembly of the linear drive device.

[0063] It is worth noting that as long as the height of the drive device body 1 and the height of the drive unit 2 in the control unit are the same, the reset effect can be achieved after assembly. For example, if the height of the drive device body 1 is adjusted to any intermediate height, after the drive unit 2 performs the above-mentioned reset operation, the control unit recognizes the running height of the drive device body 1 and then runs the drive unit 2 to the corresponding position through the control unit. The linear drive device can also achieve the corresponding technical effect of this utility model.

[0064] If the initial height is the set maximum height of the linear drive unit, after assembly, the linear drive unit will be in its highest position. At this time, the control unit will control the linear drive unit to run to the lowest height, i.e., the factory standard state. Generally, during the operation of the linear drive unit, the control unit uses the Hall sensor of drive unit 2 for position detection and real-time synchronous control. When the linear drive unit moves downward, the control unit detects the Hall signal of drive unit 2 and determines that the linear drive unit has reached the set minimum height, at which point motor 21 stops running.

[0065] During initialization, the on / off state of signal switch 25 is detected by detection board 27 to determine whether the linear drive has reached the initialization height. If signal switch 25 is detected to be touched, a corresponding level signal is output to the control unit, and the linear drive stops running.

[0066] When multiple drive unit bodies 1 operate simultaneously, since the initial height of the multiple drive unit bodies 1 is the same and the stroke L is set in the control unit, the minimum height of the linear drive units is also the same. This setting not only eliminates the inconsistency in height between different linear drive units caused by the cumulative error of the drive structure, but also facilitates the standardization of the initial height and mechanical stroke of the linear drive units, making it easier to mass-produce at low cost.

[0067] When initialization is required, the linear drive moves upward. When the signal triggering mechanism 2444 triggers the signal switch 25, the linear drive stops running.

[0068] It is worth noting that the drive unit 2 in this embodiment can be matched with any type of drive component 11, such as the drive components disclosed in patents CN105565200B, CN212489001U, CN110107620B, CN114607744B, CN217683100U, etc. The drive component 11 includes a lead screw, and the lead of the lead screw of the drive component 11 is D.

[0069] like Figures 4-5 As shown, the drive unit 2 includes a motor 21, a housing 22, a first reduction mechanism 23, a second reduction mechanism 24, and a signal switch 25. The first reduction mechanism 23 and the second reduction mechanism 24 are connected in a transmission manner and are arranged in a left-right structure. Both are located inside the housing 22. The signal switch 25 is located at the end of the housing 22 near the second reduction mechanism 24. When the signal triggering mechanism 2444 located at the output end 244 of the second reduction mechanism 24 triggers the signal switch 25, the second reduction mechanism 24 rotates to the initial position.

[0070] like Figure 6 As shown, the first reduction mechanism 23 has a worm gear tooth 231, an internal spline 232, a worm gear step 233, and an external spline 234. The worm gear tooth 231 meshes with the motor shaft 211, and the internal spline 232 is connected to the drive end of the drive assembly 11 to provide power for the operation of the drive assembly 11. The drive end can be the end of a lead screw, or it can be a shaft connector connecting the drive assembly 11 and the first reduction mechanism 23. The external spline 234 is directly or indirectly connected to the second reduction mechanism 24. With this configuration, the motor 21 drives the first reduction mechanism 23, and the first reduction mechanism 23 drives the drive assembly 11 and the second reduction mechanism 24.

[0071] like Figures 7-9As shown, the second reduction mechanism 24 is preferably a low-tooth-difference reduction mechanism with a reduction ratio of S. The second reduction mechanism 24 includes an input end 241, a fixed gear ring 242, planetary gears 243, and an output end 244. The input end 241 has an eccentric cylinder 2411 and an external spline 2412. The diameter of the external spline 2412 is larger than the diameter of the eccentric cylinder 2411. A first step 2413 is formed at the connection between the two. The eccentric cylinder 2411 passes through the fixed gear ring 242, and the first step 2413 abuts against the outer end face of the fixed gear ring 242. The planetary gears 243 are sleeved on the eccentric cylinder. On end 2411, the external teeth of planetary gear 243 mesh with the fixed gear ring 242. Output end 244 includes end cover 2441 and output gear ring 2442. Output gear ring 2442 is fixedly connected to end cover 2441. The internal teeth of output gear ring 2442 mesh with the external teeth of planetary gear 243. The difference in the number of teeth between the fixed gear ring 242 and output gear ring 2442 is 1 to 4. End cover 2441 has a connecting post 2443 at its center. The connecting post 2443 passes through the first through hole in the middle of input end 241 and is fixed by a snap ring 245, axially fixing the second reduction mechanism 24. End cover 2441 is equipped with a signal triggering mechanism 2444.

[0072] The worm gear external spline 234 of the first reduction mechanism 23 directly or indirectly meshes with the input end 241 of the second reduction mechanism 24. During operation, the worm gear external spline 234 drives the eccentric cylinder 2411 and the external spline 2412 to rotate. The eccentric cylinder 2411 rotates once, causing the planet gear 243 to rotate one tooth relative to the fixed gear ring 242 (when the planet gear 243 is one tooth away from the fixed gear ring 242). Since both the fixed gear ring 242 and the output gear ring 2442 are meshed with the planet gear 243, the output gear ring 2442 drives the output end 244 to rotate. The linear drive device runs a complete stroke L. The rotation angle A of the output end 244 of the second reduction mechanism 24 does not exceed 360°, specifically A=[L / (D×S)]×360°.

[0073] Example 2

[0074] This embodiment provides a method for assembling a linear drive device, including the following steps:

[0075] S1: Adjust the height of the drive unit body 1 to the set initial height. That is, connect the linear drive unit to the control unit, and control the linear drive unit to run to the set initial height through the control unit, and then remove the drive unit 2 of the linear drive unit.

[0076] S2: Adjust drive unit 2 to the initialization state. That is, drive unit 2, detection board 27 and control unit are connected in sequence. The control unit controls drive unit 2 to run in the initialization direction of linear drive device. When signal triggering mechanism 2444 triggers signal switch 25, detection board 27 outputs corresponding level signal to control unit, and control unit controls motor 21 to stop running.

[0077] S1 and S2 have no specific assembly order;

[0078] S3: Install drive unit 2 into drive unit body 1. If the initial height is the set maximum height of the linear drive unit, control the linear drive unit to run to the minimum height, i.e., the factory standard state, through the control unit.

[0079] Example 3

[0080] like Figure 10 As shown, the second reduction mechanism 24 and the first reduction mechanism 23 are arranged vertically. The first reduction mechanism 23 is located inside the housing 22 and is enclosed between the housing 22 and the housing cover 26. The second reduction mechanism 24 is fixed above the housing cover 26. A second through hole is opened in the middle of the housing cover 26. The input end 241 of the second reduction mechanism 24 extends into the second through hole of the housing cover 26 and is connected to the first reduction mechanism 23. The drive end of the drive assembly 11 (not shown in the figure) extends from the bottom of the housing 22 and is connected to the first reduction mechanism 23.

[0081] More specifically, such as Figures 11-13 As shown; the first reduction mechanism 23 has a worm gear tooth 231 and an internal spline 232 of the worm gear. The worm gear tooth 231 meshes with the motor shaft 211. The second reduction mechanism 24 includes an input end 241, a fixed gear ring 242, a planetary gear 243 and an output end 244. The input end 241 extends into the second through hole of the housing cover 26 and meshes with the upper part of the internal spline 232 of the worm gear. The drive end of the drive assembly 11 (not shown in the figure) extends from the bottom of the housing 22 and meshes with the lower part of the internal spline 232 of the worm gear. The input end 241 has an eccentric cylinder 2411 and an external spline 2412. A first step 2413 is provided at the connection between the eccentric cylinder 2411 and the external spline 2412. The output end 244 includes an end cover 2441 and an output gear ring 2442. The output gear ring 2442 is fixedly connected to the end cover 2441. A connecting post 2443 is provided at the center of the end cover 2441. A buckle 2445 is provided at the end of the connecting post 2443. When the buckle 2445 passes through the input end 241, it deforms inward. After the buckle 2445 passes out of the input end 241, it elastically resets and is snapped onto the second step 2414 of the input end 241, thus axially fixing the second reduction mechanism 24.

[0082] Example 4

[0083] like Figure 14As shown, the fixed gear ring 242 of the second deceleration mechanism 24 is integrated into the housing cover 26, which improves space utilization and makes the drive unit 2 smaller and more compact. The housing cover 26 has a flange edge 261, which can effectively protect the signal switch 25 and the output end 244 of the second deceleration mechanism 24 from damage caused by bumps. At least one signal switch 25 is provided, and the number of signal triggering mechanisms 2444 corresponds to the number of signal switches 25. When the number of signal triggering mechanisms 2444 is greater than one, the signal triggering mechanisms 2444 are set on different horizontal planes. Multiple signal switches 25 can meet multiple position recognition requirements or functional expansion requirements.

[0084] Example 5

[0085] In this embodiment, the detection board 27 is integrated into the drive unit 2, and the specific configuration is as follows: Figure 15 As shown, the detection plate 27 and the signal switch 25 are mounted together on the cover 26, and the flange edge 261 of the cover 26 protects the detection plate 27 and the signal switch 25. Of course, the above arrangement is not the only option; the detection plate 27 can also be mounted on the cover 26 or in other locations of the drive unit 2.

[0086] Example 6

[0087] This embodiment provides a smart home product, including the linear drive device described above or the assembly method of the linear drive device described above.

[0088] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value. The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A linear drive device, comprising a drive device body (1) and a drive unit (2), wherein the drive device body (1) comprises a nested tube assembly and a drive assembly (11), the drive assembly (11) being disposed within the tube assembly, and the drive unit (2) driving the tube assembly to extend or retract via the drive assembly (11); characterized in that: The drive unit (2) includes a motor (21), a first reduction mechanism (23), a second reduction mechanism (24), and a signal switch (25). The motor (21) is connected to the first reduction mechanism (23) in a transmission manner. The first reduction mechanism (23) is connected to the drive assembly (11) in a transmission manner. The second reduction mechanism (24) is connected to the motor (21) or the first reduction mechanism (23) in a transmission manner. The output end (244) of the second reduction mechanism (24) is provided with a signal triggering mechanism (2444). When the drive unit (2) is installed in the drive device body (1), the drive unit (2) is set to the initialization state, and the height of the drive device body (1) is the set initialization height.

2. The linear drive device according to claim 1, characterized in that: When the drive unit (2) is initialized, the drive unit (2), the detection board (27) and the control unit are connected in sequence. When the signal triggering mechanism (2444) of the output end (244) of the second deceleration mechanism (24) triggers the signal switch (25), the control unit controls the motor (21) to stop running according to the level signal received from the detection board (27).

3. A linear drive device according to claim 2, characterized in that: The detection board (27) is integrated on the drive unit (2).

4. A linear drive device according to claim 1, characterized in that: When the drive unit (2) is installed into the drive device body (1), the height of the drive device body (1) is set to the set maximum height. The linear drive device moves downward. The control unit detects the Hall signal of the motor (21) and determines that when the linear drive device moves to the set minimum height, the motor (21) stops running. Alternatively, when the drive unit (2) is installed into the drive device body (1), the height of the drive device body (1) is set to the set minimum height. The linear drive device moves upward. The control unit detects the Hall signal of the motor (21) and determines that when the linear drive device moves to the set maximum height, the motor (21) stops running.

5. A linear drive device according to claim 1, characterized in that: The second deceleration mechanism (24) includes an input end (241) and an output end (244). The motor (21) or the first deceleration mechanism (23) is connected to the input end (241) for transmission. The output end (244) is provided with a signal triggering mechanism (2444).

6. A linear drive device according to claim 5, characterized in that: The second reduction mechanism (24) further includes a fixed gear ring (242) and a planetary gear (243). The input end (241) has an eccentric cylinder (2411) and an external spline (2412). The connection between the two forms a first step (2413). The eccentric cylinder (2411) passes through the fixed gear ring (242). The first step (2413) abuts against the outer end face of the fixed gear ring (242). The planetary gear (243) is sleeved on the eccentric cylinder (2411). The external teeth of the planetary gear (243) mesh with the fixed gear ring (242). The output gear ring (2442) of the output end (244) is sleeved on the outside of the planetary gear (243). The internal teeth of the output gear ring (2442) mesh with the external teeth of the planetary gear (243).

7. A linear drive device according to claim 6, characterized in that: The second reduction mechanism (24) has a small tooth difference structure, and the difference in the number of teeth between the fixed gear ring (242) and the output gear ring (2442) is 1 to 4.

8. A linear drive device according to claim 5, characterized in that: The output end (244) includes an end cover (2441) and an output gear ring (2442), the output gear ring (2442) and the end cover (2441) are fixedly connected, and a signal triggering mechanism (2444) is provided around the end cover (2441).

9. A linear drive device according to claim 8, characterized in that: The end cap (2441) has a connecting post (2443) at its center, and the input end (241) has a first through hole in the middle. The connecting post (2443) passes through the first through hole of the input end (241) and is fixed by a snap ring (245).

10. A linear drive device according to claim 8, characterized in that: The end cap (2441) has a connecting post (2443) at its center, and the input end (241) has a first through hole in the middle. The end of the connecting post (2443) has a buckle (2445). The buckle (2445) deforms inward and passes through the first through hole of the input end (241) before resetting. The buckle (2445) engages with the second step (2414) of the input end (241).

11. A linear drive device according to claim 1, characterized in that: The first reduction mechanism (23) has a worm gear tooth (231), a worm gear internal spline (232), a worm gear step (233) and a worm gear external spline (234). The motor (21) is driven to the worm gear tooth (231), the worm gear internal spline (232) is driven to the drive assembly (11), and the worm gear external spline (234) is driven to the second reduction mechanism (24) directly or indirectly.

12. A linear drive device according to claim 1, characterized in that: The first reduction mechanism (23) has a worm gear tooth (231) and a worm gear internal spline (232). The motor (21) is connected to the worm gear tooth (231) for transmission. The second reduction mechanism (24) meshes with the upper part of the worm gear internal spline (232). The drive assembly (11) meshes with the lower part of the worm gear internal spline (232).

13. A linear drive device according to claim 1, characterized in that: The drive unit (2) includes a gearbox, the first reduction mechanism (23) and / or the second reduction mechanism (24) are disposed in the gearbox, the motor shaft (211) of the motor (21) extends into the gearbox, and the motor shaft (211) is connected to the second reduction mechanism (24) and / or the first reduction mechanism (23) in a transmission connection.

14. A linear drive device according to claim 13, characterized in that: The gearbox includes a housing (22) and a cover (26). A first reduction mechanism (23) is disposed inside the housing (22) and is enclosed between the housing (22) and the cover (26). A second reduction mechanism (24) is fixed above the cover (26). A second through hole is opened in the middle of the cover (26). The input end (241) of the second reduction mechanism (24) extends into the second through hole of the cover (26) and is connected to the first reduction mechanism (23) for transmission.

15. A linear drive device according to claim 14, characterized in that: The fixed gear ring (242) of the second deceleration mechanism (24) is fixed on the box cover (26), which has a flange edge (261).

16. A linear drive device according to claim 4, characterized in that: There is at least one signal switch (25), and the number of signal triggering mechanisms (2444) corresponds to the number of signal switches (25). When the number of signal triggering mechanisms (2444) is greater than 1, the signal triggering mechanisms (2444) are set on different horizontal planes.

17. A linear drive device according to claim 1, characterized in that: The linear drive has a stroke of L, the drive assembly (11) includes a lead screw with a lead of D, the reduction ratio of the second reduction mechanism (24) is S, the linear drive runs a complete stroke L, and the output end (244) of the second reduction mechanism (24) rotates at an angle of A=[L / (D×S)]×360°, where A<360°.

18. A smart home product, characterized in that: Includes the linear drive device as described in any one of claims 1-17.

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