Linear drive device, and smart furniture comprising same

Abstract

The present invention relates to a linear drive device and smart furniture comprising same. The linear drive device comprises a first tube assembly and a second tube assembly nested with each other, a stop member, and a drive assembly, wherein the drive assembly comprises a lead screw, a first nut, a second nut, and a drive tube; the first tube assembly comprises a first tube and a first cover plate arranged at one end of the first tube; the stop member is detachably connected to the first cover plate, one end of the lead screw is fixedly connected to the stop member, and the first nut and the second nut are connected to the lead screw in a spiral fit manner; and in the linear drive device, the stop member or the end of the lead screw can be rotated to enable the first nut and the second nut to rotate relative to the lead screw to generate axial displacement, thereby changing the distance between the second nut and the first cover plate. This product enables the adjustment of the range of the minimum height of the linear drive device, broadening the scope of application of the linear drive device.

Description

Linear drive device and intelligent furniture comprising same TECHNICAL FIELD

[0001] The present application relates to the technical field of linear drive devices, and in particular to a linear drive device and intelligent furniture comprising the same. BACKGROUND

[0002] The emergence of smart home has made people's life more convenient and convenient. Electric lifting cabinet, TV lifting bracket, electric lifting table and other smart furniture have entered more and more families. Smart furniture is one of the main application scenarios of smart linear drive. Through program control, the axial movement of the linear drive device can be realized, thereby meeting the scene requirements of different groups of people for comfortable life. However, the decoration layout of each family is different. The height requirement and placement requirement of the electric lifting cabinet or electric lifting table are also different. In the actual furniture parts procurement, warehouse storage and assembly process of the manufacturing end, it is difficult to make a linear drive device of one or a few specifications to meet the needs of almost all customers. Therefore, terminal manufacturers often need to stock a variety of specifications of linear drive devices to meet the needs of terminal customers. If the inventory management is not in place, it is easy to cause a large amount of inventory backlog. Manufacturers need to produce a variety of specifications of products, resulting in a large number of molds and parts.

[0003] A single specification product is difficult to meet the differentiated use requirements of users. Taking an electric lifting table as an example, in actual life, users often set up file cabinets, drawers and other combination furniture in the bottom space of the lifting table. If the height of the combination furniture exceeds the minimum height (or the standard intermediate clearance height) of the lifting table, the lifting table will collide during lifting, causing safety hazards. Once the lifting table collides, tilts and other use failures occur, the lifting table often needs to be initialized, so that each linear drive device is adjusted to a unified target position, thereby ensuring that the lifting table returns to the horizontal state. The conventional electric lifting table usually takes the lowest point of the mechanical position of the linear drive device as the initialization target position. Therefore, even if the user can consciously avoid the collision during the use of the lifting table, the linear drive device with a minimum height higher than the combination furniture also cannot smoothly complete the initialization action when the lifting table abnormally, resulting in the inability to eliminate the failure and return to the normal use state.

[0004] Some manufacturers also propose a solution to solve the above technical problems by completing the initialization action at the highest mechanical position of the lifting table, but this solution has the following problems: 1. The lifting table generally needs to be initialized when it is tilted, at which time if the lifting table is raised to the top for initialization, the linear drive device needs to overcome the gravity of the table top and the resistance of the upward movement, and is prone to be stuck; 2. The highest mechanical position initialization has high requirements for power and strength of parts, thereby having high cost; 3. Due to the lead error of the screw rod and other reasons, the linear drive device has the highest error, and the highest point initialization is difficult to return to the horizontal state due to the existence of the error.

[0005] In addition, some manufacturers also increase a connecting pipe at the bottom of the linear drive device, that is, the length of the first pipe assembly is increased to increase the minimum height of the linear drive device (or increase the intermediate clearance height of the lifting table); this solution cannot realize stepless adjustment of the minimum height of the linear drive device, and has little contribution to solving the differentiated needs of customers, on the other hand, the connection method is limited by the length and strength requirements of the connecting bolts, and the adjustment range is limited, in addition, the additional connecting pipe increases the minimum height, but the performance of the linear drive device and related connecting components is not improved synchronously, and it is difficult to meet the height use standard and use safety after adjustment.

[0006] Therefore, there is an urgent need for a linear drive device with adjustable minimum height to solve the series of problems caused by the unadjustable minimum height of the existing linear drive device. SUMMARY

[0007] The technical problem to be solved by the present application is to overcome the deficiencies in the prior art and provide a linear drive device with adjustable minimum height.

[0008] The technical scheme adopted by the present application to solve its technical problems is: a linear driving device, comprising a first pipe assembly and a second pipe assembly nested with each other, a stopper, a driving assembly and a driving unit; the first pipe assembly comprises a first pipe and a first cover plate arranged at the end of the first pipe; the driving assembly comprises a driving pipe, a screw rod, a first nut and a second nut, the first nut and the second nut are sleeved on the screw rod and threadedly engaged with the screw rod, the second nut is arranged between the first nut and the first cover plate, the outer wall of the second nut is matched with the inner wall of the first pipe assembly and the two are circumferentially limited and axially movable relative to each other; one end of the driving pipe is directly or indirectly connected with the driving unit, and the other end is fixedly provided with the first nut, when the driving unit drives the driving pipe to rotate, the first nut rotates synchronously with the driving pipe; one end of the screw rod is located in the driving pipe, and the other end is fixed in the circumferential direction and the axial direction with the first cover plate through the stopper, and the stopper is detachably connected with the first cover plate; the circumferential movement of the stopper or the end of the screw rod relative to the first cover plate is generated, so that the first nut and / or the second nut are axially displaced relative to the screw rod, thereby changing the distance between the first nut and / or the second nut and the first cover plate.

[0009] Further, the driving assembly further comprises a fixing seat, the first nut is rotatably arranged in the fixing seat, and the fixing seat is fixedly connected with the second pipe assembly.

[0010] Further, the screw rod and the stopper are arranged on the two sides of the first cover plate.

[0011] Further, the first cover plate is provided with a second mounting hole, the screw rod is provided with a connecting part, the connecting part passes through the second mounting hole of the first cover plate and is fixedly connected with a fourth mounting hole arranged on the stopper in a non-circular manner.

[0012] Further, the stopper is provided with a third mounting hole, the first cover plate is provided with a first mounting hole corresponding in position to the third mounting hole, and the first cover plate and the stopper are fixedly connected through the corresponding first mounting hole and third mounting hole and a second fastener.

[0013] Further, the screw rod is provided with a limiting part, which abuts against the lower side of the first cover plate when the first cover plate is fixedly connected with the stopper.

[0014] Further, the limiting part is at least one of a limiting step, a limiting snap spring or an elastic shaft baffle.

[0015] The present scheme can also have a second implementation, that is:

[0016] Further, the screw rod and the stopper are located inside the first pipe assembly.

[0017] Further, the screw rod is provided with a connecting part, and the connecting part is fixedly connected with the fourth mounting hole of the stopper in a non-circular manner.

[0018] Further, the screw rod is provided with a limiting part, and the limiting part abuts against the lower side of the stopper when the screw rod is fixedly connected with the stopper.

[0019] Further, the stopper is provided with a third mounting hole, and the first cover plate is provided with a first mounting hole corresponding to the third mounting hole, and the first cover plate and the stopper are fixedly connected through the corresponding first mounting hole and third mounting hole and through the second fastener.

[0020] Further, the limiting part is at least one of a limiting step, a limiting snap spring or an elastic collar for a shaft.

[0021] Further, the stopper is provided with an adjusting part facilitating rotation of the stopper, the adjusting part is an arbitrary non-circular structure or a combination structure of a plurality of circular structures, and the adjusting part has a certain height.

[0022] Further, the linear driving device is further provided with an adjusting wrench matched with the adjusting part or the connecting part of the screw rod, and the screw rod is directly or indirectly driven to rotate through the adjusting wrench.

[0023] Further, the driving unit is a driving motor or an arbitrary gear structure with external driving input.

[0024] Further, the first nut and the second nut are provided with a damping device for buffering.

[0025] The application further relates to an intelligent furniture comprising the linear driving device in any of the two schemes.

[0026] The application has the following beneficial effects:

[0027] 1. The application sets the stopper detachably connected with the first cover plate, in a conventional use state, the stopper, the screw rod and the first cover plate are fixed in the circumferential direction and the axial direction, the driving unit drives the driving pipe to rotate, and then the whole linear driving device completes the telescopic movement, when adjustment is needed, the stopper only needs to be removed, the screw rod is directly rotated or the screw rod is indirectly driven to rotate by rotating the stopper, so that the axial displacement of the first nut and / or the second nut relative to the screw rod can adjust the minimum height of the linear driving device, without changing the size and specifications of the parts of the linear driving device, the application can solve the application problem of the minimum height;

[0028] 2. The minimum height of the linear driving device can be adjusted, the application greatly widens the application scenarios of the linear driving device, effectively solves the problem that a single specification product is difficult to meet the differentiated use requirements of users, and makes standardized production of the product possible.

[0029] 3. The linear drive device of the present application has a simple and easy-to-operate minimum height adjustment process, and the stroke of the linear drive device can be adjusted by manual adjustment, so that the manufacturing terminal and the consumer terminal can be easily operated, and the consumer terminal can be freely matched with the combination furniture of the product after purchasing the product without considering the problem caused by the minimum height, and the applicability of the product is stronger;

[0030] 4. The linear drive device of the present application has a stepless adjustment of the minimum height, and the minimum height can be adjusted to any value within a certain range by increasing a connecting pipe at the bottom of the linear drive device, so that the stepless adjustment is more humanized and the applicability is stronger;

[0031] 5. The linear drive device of the present application completes the initialization operation at the lowest position of the mechanical structure, and compared with the initialization at the highest point of the linear drive device, the precision and performance requirements of each component or part are lower, the manufacturing cost can be effectively reduced, and the initialization operation at the lowest position is more convenient, and the safety and experience of the operation process are better;

[0032] 6. The linear drive device of the present application is not affected by the maximum stroke height after adjustment at the minimum height, and does not cause application limitation and safety problems caused by the change of the maximum stroke;

[0033] 7. The damping device is arranged between the first nut and the second nut, which can play a buffering role during operation or adjustment, avoid damage to the first nut and / or the second nut, improve the service life of the parts, and make the operation or adjustment process of the linear drive device more smooth and smooth due to the reduction of hard impact. BRIEF DESCRIPTION OF DRAWINGS

[0034] The present application will be further described below in combination with the drawings and examples.

[0035] Fig. 1 is a lifting table of the present application.

[0036] Fig. 2 is a partial schematic view of an embodiment of the linear drive device of the present application.

[0037] Fig. 3 is a sectional view of the embodiment of the linear drive device of the present application; wherein Fig. 3(a) is a sectional view of the embodiment of the linear drive device of the present application at the lowest point; and Fig. 3(b) is a sectional view of the embodiment of the linear drive device of the present application after adjusting the minimum height.

[0038] Fig. 4 is a partial exploded view of the embodiment of the linear drive device of the present application.

[0039] Fig. 5 is an axonometric view of a stopper of the embodiment of the present application.

[0040] Fig. 6 is an axonometric view of an adjustment wrench of the embodiment of the present application.

[0041] Fig. 7 is a partial view of the second embodiment of the linear drive device of the present application.

[0042] Fig. 8 is a sectional view of the second embodiment of the linear drive device of the present application; Fig. 8(a) is a sectional view of the second embodiment of the linear drive device of the present application at the lowest point; Fig. 8(b) is a sectional view of the second embodiment of the linear drive device of the present application after adjusting the lowest point.

[0043] Fig. 9 is a partial exploded view of the second embodiment of the linear drive device of the present application.

[0044] Fig. 10 is an axonometric view of the stopper of the second embodiment of the present application.

[0045] Fig. 1: 1, table board; 2, linear drive device; 21, second tube assembly; 3, first tube assembly; 31, first tube; 32, first cover plate; 321, first mounting hole; 322, second mounting hole; 4, stopper; 41, third mounting hole; 42, fourth mounting hole; 43, adjusting portion; 5, screw rod; 51, connecting hole; 52, connecting portion; 53, limiting portion; 6, adjusting wrench; 61, boss; 62, adjusting handle; 7, first fastener; 8, second fastener; 9, second nut; 10, damping device; 11, drive unit; 12, file cabinet; 13, first nut; 14, drive tube; 15, fixing seat. DETAILED DESCRIPTION

[0046] The present application will be further described below with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic views and only show the basic structure of the present application in a schematic manner, and thus only show the components related to the present application.

[0047] Embodiment 1

[0048] The linear drive device is the core component of intelligent furniture such as electric lifting cabinet, lifting island table, lifting cabinet, TV lifting support, electric lifting table, etc. Taking the electric lifting table as an example, it comprises at least one linear drive device 2 and a table board 1. Usually, a file cabinet or other furniture is placed below the table board. When the lifting table is lowered to the lowest point, the lowest height (or the minimum intermediate clearance height) H1 is less than the height H of the file cabinet 12, as shown in the left part of Fig. 1. Therefore, when the lifting table needs to be initialized or lowered to the lowest point, the lifting table is likely to collide with the file cabinet 12, thereby causing a safety hazard. If the lowest height (or the minimum intermediate clearance height) of the lifting table can be adjusted from H1 to H2, and H1 < H < H2, as shown in the right dashed part of Fig. 1, the lifting table will not collide with the file cabinet 12.

[0049] According to the linear driving device 2 shown in FIG. 3 and FIG. 4, comprising: a pipe assembly, a driving unit 11 and a stopper 4, the pipe assembly comprising a second pipe assembly 21 and a first pipe assembly 3, the first pipe assembly 3 comprising a first pipe 31, one side of the first pipe 31 being nested with the second pipe assembly 21, and the other side end being provided with a first cover plate 32, here, the end refers to the port and its nearby position, the same below; the driving unit 11 is a driving motor or any gear structure with external driving input; the driving assembly comprises a lead screw 5, a driving pipe 14, a first nut 13, a second nut 9 and a fixed seat 15, the outer wall of the lead screw 5 is provided with external threads, the first nut 13 and the second nut 9 are both sleeved on the lead screw 5 and threadedly matched with the lead screw 5; one side end of the driving pipe 14 is directly or indirectly connected with the driving unit 11, the other side end of the driving pipe 14 is non-circularly connected with the first nut 13, and the driving pipe 14 is axially and circumferentially fixed with the first nut 13 through the fixed seat 15, so that the driving pipe 14 and the first nut 13 are synchronously rotated when the driving pipe 14 is driven to rotate by the driving unit 11; the first nut 13 is rotatably arranged in the fixed seat 15, and the fixed seat 15 is fixed at the pipe opening of the second pipe assembly 21; the peripheral wall of the second nut 9 is matched with the inner wall of the first pipe 31 and can slide in the first pipe 31, the second nut 9 is arranged between the first nut 13 and the first cover plate 32, one end of the lead screw 5 is arranged in the driving pipe 14 and is provided with a stroke limiting device, the lead screw 5 and the driving pipe 14 can relatively stretch and contract in the axial direction, the other end of the lead screw 5 is fixed with the first cover plate 32 in the circumferential and axial directions through the stopper 4, preferably, the lead screw 5 is non-circularly fixedly connected with the stopper 4, and the stopper 4 is detachably fixedly connected with the first cover plate 32.

[0050] The lead screw 5 is non-circularly fixedly connected with the stopper 4, preferably, the connecting part 52 is provided with external splines, and the fourth mounting hole 42 of the stopper 4 is provided with internal splines matched with the external splines, but the non-circular fixed connection is not limited to this structure, and can also be the cooperation of special-shaped structures such as a D-shaped rod and a D-shaped hole, the cooperation of polygonal rods and polygonal holes, etc., as long as the non-cylindrical structure and the non-circular inner hole can realize the circumferential fixation of the lead screw 5 and the stopper 4, and the specific structure is not enumerated in this embodiment.

[0051] Under normal conditions, since the lead screw 5 and the stop 4 are not circularly fixedly connected, their circumferential rotation and axial movement are restricted. The stop 4 is fixedly connected to the first cover plate 32, and the second nut 9 is in contact with the lower side of the first cover plate 32. When the drive unit 11 drives the drive tube 14 to rotate, the first nut 13 and the drive tube 14 rotate synchronously. Since the lead screw 5 and the first nut 13 are threadedly engaged, the first nut 13 and the lead screw 5 move axially, thereby realizing the extension and retraction of the linear drive device 2 until the first nut 13 touches the travel limit device at the end of the lead screw 5. During the extension of the linear drive device 2, since the lead screw 5 does not rotate, the second nut 9, which is sleeved on the lead screw 5, does not move axially or circumferentially, and the relative distance between the first nut 13 and the second nut 9 increases. During the retraction of the linear drive device 2, the relative distance between the first nut 13 and the second nut 9 decreases until the first nut 13 directly or indirectly abuts against the second nut 9. At this time, the linear drive device 2 descends to its lowest point.

[0052] The linear drive device 2 also includes a shock absorber 10, which is located between the first nut 13 and the second nut 9. The shock absorber 10 can play a buffering role when the linear drive device 2 is adjusted to the lowest height or when an initialization action must be performed.

[0053] As shown in Figure 2, the lead screw 5 and the stop 4 are respectively installed on both sides of the first cover plate 32, that is, the stop 4 is installed from the outside of the first pipe assembly 3, and the lead screw 5 is installed inside the first pipe assembly 3. The first cover plate 32 is provided with a second mounting hole 322; the stop 4 is provided with a fourth mounting hole 42; the lead screw 5 is provided with a connecting hole 51, a connecting part 52 and a limiting part 53. After the connecting part 52 of the lead screw 5 passes through the second mounting hole 322 of the first cover plate 32 and the fourth mounting hole 42 of the stop 4, it is fixedly connected to the stop 4 by the first fastener 7. It should be noted that those skilled in the art should know that it is not limited to the connecting part 52 being provided on the lead screw 5, but can also be provided on the stop 4, and even a part of the connecting part can be provided on both the lead screw 5 and the stop 4, as long as the lead screw 5 and the stop 4 can be installed from both sides of the first cover plate 32 and fixed in both axial and circumferential directions.

[0054] The lead screw 5 and the stop 4 are fixedly connected in a non-circular manner. Preferably, the connecting part 52 is provided with an external spline, and the fourth mounting hole 42 of the stop 4 is provided with an internal spline that cooperates with the external spline.

[0055] The stop 4 is detachably connected to the first cover plate 32, and the two are circumferentially fixed by screw fastening and irregular structure connection. Preferably, the stop 4 is also provided with at least one third mounting hole 41, and the first cover plate 32 is provided with a first mounting hole 321 corresponding to the third mounting hole 41. The first cover plate 32 and the stop 4 can be fixedly connected by the second fastener 8 through the first mounting hole 321 and the third mounting hole 41.

[0056] According to the drawings 5 and 6, as preferred, the stopper 4 is provided with an adjusting part 43 with a non-circular hole structure, the adjusting wrench 6 is provided with a boss 61 matched with the non-circular hole structure of the adjusting part 43, by rotating the adjusting handle 62, the stopper 4 can be rotated; the adjusting part 43 and the boss 61 can be arranged reversely, and the same effect can be achieved.

[0057] The limiting part 53 abuts against the lower side of the first cover plate 32, and can be a limiting step, or a external part sleeved on the end of the screw rod 5, such as a limiting spring ring or a elastic retaining ring for shaft.

[0058] As shown in Fig. 3(a), the lowest height of the linear drive device 2 is L3, when the combined furniture with a height greater than L3 is assembled, the lowest height of the linear drive device 2 needs to be adjusted, at this time, the distance between the pipe mouths of the first pipe assembly 3 and the second pipe assembly 21 is S3;

[0059] Firstly, the second fastener 8 for fixing and connecting the first cover plate 32 and the stopper 4 is disassembled;

[0060] Then, the stopper 4 is rotated by the adjusting wrench 6, since the stopper 4 and the screw rod 5 are fixed in the circumferential and axial directions, the stopper 4 drives the screw rod 5 to rotate, since the second nut 9 and the first nut 13 are threadedly matched with the screw rod 5, the rotation of the screw rod 5 causes the axial movement of the second nut 9 and / or the first nut 13, i.e. the sleeving position of the second nut 9 and / or the first nut 13 on the screw rod 5 changes, the extension distance of the screw rod 5 relative to the drive pipe 14 becomes longer, since the screw rod 5 is axially fixed with the first cover plate 32, the second nut 9 axially slides in the first pipe 31, and the distance between the second nut 9 and the first cover plate 32 is increased, i.e. the relative movement between the second nut 9 and the first pipe assembly 3 is realized, the first pipe assembly 3 is synchronously elongated, and the lowest height of the linear drive device 2 is increased;

[0061] When the linear drive device 2 is extended to a suitable position, for example, the lowest height of the linear drive device 2 is L4, L4 is higher than the height of the combined furniture, the first cover plate 32 and the stopper 4 are fixedly connected by using the second fastener 8, so as to realize the locking of the lower limit position of the lowest height of the linear drive device 2; at this time, the distance between the first pipe assembly 3 and the second pipe assembly 21 is S4, as shown in FIG. 3(b), S3 < S4, L3 < L4. When the adjusted linear drive device 2 enters the normal use state again, the lowest height has been adjusted to L4, and the highest height does not change, and the highest height is still the stroke limiting device that the first nut 13 touches the end of the lead screw 5, and the linear drive device 2 reaches the highest height. At this time, when the linear drive device 2 needs to be initialized through the lowest mechanical position due to use failure, the linear drive device 2 can be safely lowered to the lowest height for initialization, and no safety hazard will occur. When the furniture to be initialized is provided with a plurality of linear drive devices 2, since the lowest heights of the linear drive devices 2 are all L4, the heights are consistent, and therefore the furniture can be accurately returned to a uniform height and reach a horizontal position.

[0062] Of course, the stopper 4 can also be completely disassembled, at this time, the adjustment wrench 6 can be used to rotate the end of the lead screw 5, for example, the connecting part 52, and the same effect can be achieved by directly rotating the lead screw 5 and the stopper 4, and other equivalent replacement modes are also within the protection scope of the embodiment.

[0063] Embodiment Two

[0064] According to FIGS. 7, 8 and 9, the embodiment is different from the first embodiment in that the first nut 13 is fixed at one end of the drive pipe 14 and rotates synchronously with the drive pipe 14; the stopper 4 and the lead screw 5 are located on the same side of the first cover plate 32, that is, the inside of the first pipe assembly 3; the stopper 4 is first fixedly connected with the lead screw 5 by using the first fastener 7, at this time, the limiting part 53 of the lead screw 5 abuts against the lower side of the stopper 4; the stopper 4 is provided with an adjusting part 43 with a special shape such as a hexagonal shape or a waist shape, the adjusting part 43 can pass through the second mounting hole 322 of the first cover plate 32 and can rotate in the second mounting hole 322, and the hexagonal adjusting part 43 facilitates the customer to use a standard socket wrench to adjust the extension height of the first pipe assembly 3, that is, the lowest height of the linear drive device 2.

[0065] When it is necessary to adjust the lowest height of the linear drive device 2, at this time, the lowest height of the linear drive device 2 is L3, and the distance between the first pipe assembly 3 and the second pipe assembly 21 is S3, as shown in FIG. 8(a);

[0066] First, the second fastener 8 for fixedly connecting the first cover plate 32 and the stopper 4 is disassembled;

[0067] Then, the stopper 4 is rotated by a standard sleeve wrench matched with the adjusting part 43, and the stopper 4 drives the screw rod 5 to rotate due to the circumferential relative fixation of the stopper 4 and the screw rod 5; since the upper side of the stopper 4 abuts against the lower side of the first cover plate 32, the stopper 4 drives the first pipe assembly 3 to extend synchronously when the screw rod 5 rotates;

[0068] When the linear driving device 2 is extended to a proper position, the first cover plate 32 and the stopper 4 are fixedly connected by using the second fastener 8, so as to lock the lower limit position of the lowest height of the linear driving device 2; at this time, the lowest height of the linear driving device 2 is L4, and the distance between the first pipe assembly 3 and the second pipe assembly 21 is S4, as shown in Fig. 8(b), S3

[0069] Other unexplained schemes, by changing the nesting mode of the first pipe assembly 3 and the second pipe assembly 21, the principle of adjusting the lowest height of the linear driving device 2 is the same as the present application, and is also within the protection scope of the present application.

[0070] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable the person skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A linear drive device, characterized in that: The assembly includes a first tube assembly (3) and a second tube assembly (21) nested together, a stop (4), a drive assembly, and a drive unit (11); the first tube assembly (3) includes a first tube (31) and a first cover plate (32) disposed at the end of the first tube (31); the drive assembly includes a drive tube (14), a lead screw (5), a first nut (13), and a second nut (9), the first nut (13) and the second nut (9) are both sleeved on the lead screw (5) and threadedly engaged with the lead screw (5), the second nut (9) is disposed between the first nut (13) and the first cover plate (32), the outer wall of the second nut (9) fits with the inner wall of the first tube assembly (3) and the two are circumferentially limited but axially movable; one end of the drive tube (14) is straight The first nut (13) is directly or indirectly connected to the drive unit (11), and a first nut (13) is fixedly provided at the other end. The drive unit (11) drives the drive tube (14) to rotate, and the first nut (13) rotates synchronously with the drive tube (14). One end of the lead screw (5) is located inside the drive tube (14), and its other end is fixed circumferentially and axially to the first cover plate (32) through the stop (4). The stop (4) is detachably connected to the first cover plate (32). By rotating the stop (4) or the end of the lead screw (5), a circumferential movement relative to the first cover plate (32) is generated, so that the first nut (13) and / or the second nut (9) are axially displaced relative to the lead screw (5), thereby changing the distance between the first nut (13) and / or the second nut (9) and the first cover plate (32).

2. The linear drive device according to claim 1, characterized in that: The drive assembly also includes a fixed base (15), in which the first nut (13) is rotatably disposed, and the fixed base (15) is fixedly connected to the second tube assembly (21).

3. A linear drive device according to claim 1 or 2, characterized in that: The lead screw (5) and the stop (4) are arranged on both sides of the first cover plate (32).

4. A linear drive device according to claim 3, characterized in that: The first cover plate (32) is provided with a second mounting hole (322), and the lead screw (5) is provided with a connecting part (52). After the connecting part (52) passes through the second mounting hole (322) of the first cover plate (32), it is fixedly connected to the fourth mounting hole (42) provided on the stop (4) in a non-circular manner.

5. A linear drive device according to claim 4, characterized in that: The stop (4) is provided with a third mounting hole (41), and the first cover plate (32) is provided with a first mounting hole (321) corresponding to the position of the third mounting hole (41). The first cover plate (32) and the stop (4) are fixedly connected by the second fastener (8) through the corresponding first mounting hole (321) and third mounting hole (41).

6. A linear drive device according to claim 5, characterized in that: The lead screw (5) is provided with a limiting part (53). When the first cover plate (32) is fixedly connected to the stop (4), the limiting part (53) abuts against the lower side of the first cover plate (32).

7. A linear drive device according to claim 6, characterized in that: The limiting part (53) is at least one of a limiting step, a limiting snap ring, or a shaft elastic retaining ring.

8. A linear drive device according to claim 1 or 2, characterized in that: The lead screw (5) and the stop (4) are both located inside the first tube assembly (3).

9. A linear drive device according to claim 8, characterized in that: The lead screw (5) is provided with a connecting part (52), and the connecting part (52) is fixedly connected to the fourth mounting hole (42) of the stop (4) in a non-circular manner.

10. A linear drive device according to claim 9, characterized in that: The lead screw (5) is provided with a limiting part (53). When the lead screw (5) is fixedly connected to the stop (4), the limiting part (53) abuts against the lower side of the stop (4).

11. A linear drive device according to claim 8, characterized in that: The stop (4) is provided with a third mounting hole (41), and the first cover plate (32) is provided with a first mounting hole (321) corresponding to the third mounting hole (41). The first cover plate (32) and the stop (4) are fixedly connected by the second fastener (8) through the corresponding first mounting hole (321) and third mounting hole (41).

12. A linear drive device according to claim 10, characterized in that: The limiting part (53) is at least one of a limiting step, a limiting snap ring, or a shaft elastic retaining ring.

13. A linear drive device according to claim 1 or 2, characterized in that: The stop (4) is provided with an adjustment part (43) to facilitate the rotation of the stop (4). The adjustment part (43) is an arbitrary non-circular structure or a combination of several circular structures, and the adjustment part (43) has a certain height.

14. A linear drive device according to claim 13, characterized in that: The linear drive device (2) is also equipped with an adjustment wrench (6) that is compatible with the connection part (52) of the adjustment part (43) or the lead screw (5), and the lead screw (5) is driven to rotate directly or indirectly by the adjustment wrench (6).

15. A linear drive device according to claim 1, characterized in that: The drive unit (11) is a drive motor or any gear-like structure with external drive input.

16. A linear drive device according to claim 1, characterized in that: A shock-absorbing device (10) for buffering is provided between the first nut (13) and the second nut (9).

17. A smart furniture, characterized in that: (2) includes a linear drive device as described in any one of claims 1-16.

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