Linear motor and device using the same

Abstract

The present invention relates to the field of transmission technology, and provides a linear motor and a device using the linear motor, wherein the linear motor comprises an outer tube assembly, a transmission device, a control assembly and a power supply assembly, wherein the outer tube assembly comprises at least two sub-tubes sequentially sleeved from the inside to the outside, and two adjacent sub-tubes can move relative to each other along the tube length direction of the sub-tubes themselves; the transmission device is arranged in the outer tube assembly and is used to drive the sub-tubes of the outer tube assembly to move relative to each other; the control assembly is arranged in the sub-tube of the outer tube assembly and is electrically connected to the transmission device; and the power supply assembly is arranged in the sub-tube of the outer tube assembly and is electrically connected to the control assembly. The transmission device, the control assembly and the power supply assembly are built into the sub-tube of the outer tube assembly, so that the overall structure of the linear motor is more compact, the appearance is more concise, and it can be suitable for a variety of scenarios.

Description

Technical Field

[0001] The present invention relates to the field of transmission technology, and in particular to a linear motor and a device using the linear motor. Background Art

[0002] Linear motors often use a combination of screws and nuts to achieve the lifting or extension of components such as sleeves. They are often used in devices that need to be lifted or extended, such as lifting columns and electric push rods.

[0003] The control device and power supply of the existing lifting body, electric push rod and other devices are all externally arranged, which results in low compactness of the entire device and is not conducive to use in a limited space. Summary of the invention

[0004] The purpose of the present invention is to provide a linear motor, aiming to solve the problem of large overall volume and low compactness of existing linear motors.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present application provides a linear motor, the linear motor comprising:

[0007] The outer tube assembly comprises at least two sub-tubes which are sequentially sleeved from the inside to the outside, and the two adjacently sleeved sub-tubes can move relative to each other along the tube length direction of the sub-tubes themselves;

[0008] A transmission device, which is arranged in the outer tube assembly and is used to drive the sub-tubes of the outer tube assembly to move relative to each other;

[0009] a control assembly, the control assembly being disposed in the sub-tube of the outer tube assembly and being electrically connected to the transmission device; and,

[0010] A power supply component is disposed in the sub-tube of the outer tube component and is electrically connected to the control component.

[0011] Beneficial effects of the present invention: The linear motor provided by the present invention has the transmission device, control component and power supply component built into the sub-tube of the outer tube component, so that the overall structure of the linear motor is more compact, the appearance is more concise, and it can be suitable for a variety of scenarios. Specifically, during the extension process, the power output end of the transmission device drives the outermost sub-tube of the outer tube component to extend along its own tube length direction until it drives the adjacent sub-tube to extend in the tube length direction; during the retraction process, the power output end of the transmission device drives the innermost sub-tube of the outer tube component to retract along its own tube length direction, and each sub-tube side is successively retracted into the outermost sub-tube.

[0012] In one embodiment, the transmission device includes: a transmission assembly, the transmission assembly includes a fixed screw with a first external thread, a transmission screw with a hollow structure, and a transmission nut arranged at one end of the transmission screw, the transmission screw and the transmission nut are both sleeved on the fixed screw, and the internal thread of the transmission nut cooperates with the first external thread, the transmission screw is connected to the innermost sub-tube of the outer tube assembly; a driving mechanism, the power output end of the driving mechanism is connected to the transmission assembly, and is used to drive the fixed screw and the transmission screw to rotate and / or move relative to each other.

[0013] In one embodiment, the fixed screw is a hollow structure, and the driving mechanism is built into the fixed screw, and the driving mechanism includes a power part fixed in the fixed screw, and the power part has a power output shaft extending from the fixed screw and cooperating with the inner wall of the transmission screw; or, the driving mechanism includes a power part fixed in the fixed screw and a linkage part, and the power part has a power output shaft extending from the fixed screw, and the linkage part is connected to the power output shaft and cooperates with the inner wall of the transmission screw; the power part is a motor, and the motor has the power output shaft; or, the power part includes a motor and a gear box connected to the output shaft of the motor, and the gear box has the power output shaft.

[0014] In one embodiment, the control component includes a control circuit board, which is installed in the fixed screw rod and is electrically connected to the power supply component; or, the control component includes a control circuit board, which is electrically connected to the power supply component; the fixed screw rod is provided with a first support member, a second support member, and a fixing tube whose opposite ends are respectively connected to the first support member and the second support member, both of which are hollow structures, the control circuit board is placed in the fixing tube, and the opposite ends of the control circuit board are respectively connected to the first support member and the second support member.

[0015] In one embodiment, the outer tube assembly further comprises a base covering the open end of the outermost sub-tube and a centering piece arranged on the base, wherein the centering piece is inserted into the fixed screw rod.

[0016] In one embodiment, the power supply assembly is a rechargeable power supply assembly and / or a plug-in power supply assembly.

[0017] In one embodiment, the linear motor includes a limiting mechanism, and the limiting mechanism includes a mechanical limiting mechanism and / or an electronic limiting mechanism.

[0018] In one embodiment, the mechanical limit mechanism is a stop member, which is arranged on the outer side of the fixed screw and is used to limit the lower limit position of the movement of the transmission nut; the electronic limit mechanism is a limit switch, which is arranged on the base and is used to limit the lower limit position of the movement of the transmission nut, and the limit switch is electrically connected to the control component.

[0019] In one embodiment, a guide member is provided between the transmission screw and the innermost sub-tube of the outer tube assembly, and an end cap for axially limiting the guide member is provided at one end of the transmission screw.

[0020] In a second aspect, the present application also provides a device using a linear motor, including the linear motor described above.

[0021] Beneficial effects of the present invention: The device using a linear motor provided by the present invention, on the basis of having the above-mentioned linear motor, has a more compact overall structure, a smaller size, occupies less space, and can adapt to more scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 An exploded view of a linear motor provided by an embodiment of the present invention;

[0024] Figure 2 An exploded diagram of a fixed screw rod, a control assembly, and a drive mechanism of a linear motor provided in an embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of a linear motor provided by an embodiment of the present invention;

[0026] Figure 4 A first schematic diagram of the exploded structure of an outer tube assembly provided in an embodiment of the present invention;

[0027] Figure 5 A second schematic diagram of the exploded structure of the outer tube assembly provided in an embodiment of the present invention;

[0028] Figure 6 A schematic cross-sectional view of the outer tube assembly provided in an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the structure of a sliding member provided in an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of the exploded structure of a sliding member provided in an embodiment of the present invention.

[0031] Among them, the reference numerals in the figure are:

[0032] 100, outer tube assembly; 10, sub-tube; 20, sliding member; 21, patch portion; 22, slide portion; 2101, connecting through hole; 101, plug hole; 2201, plug portion; 2202, oil storage hole; 30, sealing member; 31, clamping portion; 11, clamping matching portion; 40, connecting member; 200, linear motor; 201, transmission device; 202, control assembly; 203, power supply assembly; 204, transmission assembly; 205, driving mechanism; 206, first external thread; 2 07, second external thread; 208, fixed screw; 209, transmission screw; 210, transmission nut; 211, power unit; 212, linkage; 213, motor; 214, gear box; 215, control circuit board; 216, base; 217, centering piece; 218, first support member; 219, second support member; 220, fixed tube; 221, plug-in structural member; 222, mechanical limit mechanism; 223, electronic limit mechanism; 224, guide member; 225, end cover. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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 cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Please refer to Figures 1 to 3 The linear motor 200 of the present application can be applied to devices that need to realize lifting functions, such as lifters, lifting platforms, lifting tables, etc., but is not limited to these; the linear motor 200 includes an outer tube component 100, a transmission device 201, a control component 202 and a power supply component 203.

[0038] The outer tube assembly 100 includes at least two sub-tubes 10 which are sequentially sleeved from the inside to the outside, and the two adjacent sub-tubes 10 can move relative to each other along the tube length direction of the sub-tubes 10. Here, the number of sub-tubes 10 can be two, three or more, and each sub-tube 10 is sequentially sleeved from the inside to the outside, that is, the inner diameter or cross-section of each sub-tube 10 gradually increases from the inside to the outside; the adjacent sub-tubes 10 can move relative to each other along the tube length direction of the sub-tubes 10, and one of the adjacent sub-tubes 10 can be fixed and the other sub-tube 10 can move, or both sub-tubes 10 can move while one of the sub-tubes 10 moves relative to the other sub-tube 10, and there is a distance or gap between the adjacent sub-tubes 10; wherein, the sub-tube 10 is a hollow tubular body or sleeve body, which can be a square tube to facilitate limiting the relative rotation between the sub-tubes 10, and of course, it can also be other polygonal tubes, circular tubes, etc., but is not limited thereto.

[0039] The transmission device 201 refers to a power mechanism that can provide driving force to drive the sub-tubes 10 of the outer tube assembly 100 to move, such as a screw transmission mechanism, but is not limited thereto. Specifically, the transmission device is arranged in the outer tube assembly and is used to drive the sub-tubes of the outer tube assembly to move relative to each other.

[0040] The control assembly 202 is mainly used to control the power output size and direction of the transmission device 201, that is, to achieve the extension and retraction speed and direction of each sub-tube 10. The control assembly 202 is arranged in the sub-tube 10 of the outer tube assembly 100. It can be understood that each sub-tube 10 is arranged in sequence, and the control assembly 202 can be arranged in the innermost sub-tube 10, or in the space between two adjacent sub-tubes 10.

[0041] The power supply assembly 203 is used to supply power to the transmission device 201 and the control assembly 202. The power supply assembly 203 is disposed in the sub-tube 10 of the outer tube assembly 100. It can be understood that the power supply assembly 203 can be disposed in the innermost sub-tube 10, or in the space between two adjacent sub-tubes 10; or in the outermost sub-tube 10.

[0042] The linear motor 200 provided by the present invention has the transmission device 201, the control component 202 and the power supply component 203 built into the sub-tube 10 of the outer tube component 100, so that the overall structure of the linear motor 200 is more compact, the appearance is more concise, and it can be suitable for a variety of scenarios. Specifically, during the extension process, the power output end of the transmission device 201 drives the sub-outer layer of the outer tube component 100 to extend along its own tube length direction until the adjacent sub-tube 10 is extended in the tube length direction; during the retraction process, the power output end of the transmission device 201 drives the innermost sub-tube 10 of the outer tube component 100 to retract along its own tube length direction, and each sub-tube 10 side is successively retracted into the outermost sub-tube 10.

[0043] Please refer to Figures 4 to 8 In one embodiment, the outer tube assembly 100 further includes a sliding member 20. The sliding member 20 is disposed between two adjacent sub-tubes 10. The sliding member 20 may be connected to one of the sub-tubes 10, or may be movably disposed in the space formed between the two adjacent sub-tubes 10 without being connected to the sub-tube 10. One or more sliding members 20 may be disposed between two adjacent sub-tubes 10. For example, when the sub-tube 10 is a square tube, at least one sliding member 20 may be disposed on each of the four sides of the sub-tube 10. The sliding member 20 includes a patch portion 21 and a slide portion 22 connected to the patch portion 21. The patch portion 21 and the slide portion 22 may be in the form of a sheet, a plate or a block. The sheet portion 21 is a soft material patch portion, that is, a patch portion made of soft material, wherein the soft material refers to a material that can be deformed when subjected to force, such as rubber, silicone, latex, etc., specifically an elastic material, but not limited to this; the slide portion 22 slides with the sub-tube 10, and the patch portion 21 may not slide with the sub-tube 10, for example, it may be connected to the sub-tube 10, or it may be clamped between two slide portions 22 and the two slide portions 22 may slide with the two sub-tubes 10 respectively. Of course, in some embodiments, the patch portion 21 may also slide with the sub-tube 10.

[0044] In one embodiment, the slide part 22 is a hard material slide part, that is, the slide part 22 is made of a hard material, such as hard plastic, metal, etc., but not limited thereto. In this way, by setting the slide part to be a hard material, the friction force of the relative sliding between the slide part 22 and the sub-tube 10 can be reduced, which is conducive to improving the smoothness of the relative sliding between the slide part 22 and the sub-tube 10, thereby improving the smoothness and stability of the relative movement between the sub-tubes 10.

[0045] It should be noted that, in some other embodiments, the slide portion 22 may also be a non-hard material slide portion, for example, it may be a soft material slide portion, but the friction force of the sliding fit between it and the sub-tube 10 may be greater than that of the hard material slide portion, and thus the sliding smoothness between it and the sub-tube 10 is not as good as the sliding smoothness between the hard material slide portion and the sub-tube 10.

[0046] In one embodiment, see Figures 4 to 8 In two adjacent sub-tubes 10, the slide portion 22 of the sliding member 20 is connected to one of the sub-tubes 10 so that the patch portion 21 is clamped between the slide portion 22 and the sub-tube 10. For example, the slide portion 22 can have a plug-in structure or a clip-on structure, and the plug-in structure or the clip-on structure can bypass or penetrate the patch portion 21 and be plugged or clipped with the sub-tube 10. The slide portion 22 slides with the inner surface of the other sub-tube 10. With such arrangement, the sliding member 20 is fixed on one sub-tube 10 and slidably cooperates with the inner surface of the other sub-tube 10, and can move as the sub-tube 10 moves relative to the other sub-tube 10, thereby improving the stability of the sliding member 20 in the sub-tube 10, thereby ensuring the sliding support effect, so as to ensure the stability of the relative movement of the two sub-tubes 10; and can avoid the sliding cooperation of the patch portion 21 with the sub-tube 10, and only the sliding portion 22 with the sub-tube 10 can be slidably cooperated, which is conducive to smoother sliding, and only one sliding portion 22 and one patch portion 21 are required.

[0047] Optionally, in some other embodiments, the sliding member 20 may also be fixed on one sub-tube 10 and slide in cooperation with the outer surface of the other sub-tube 10. Specifically, in two adjacent sub-tubes 10, the sliding sheet 22 is connected to one of the sub-tubes 10, so that the patch portion 21 is sandwiched between the sliding sheet 22 and the sub-tube 10, and the sliding sheet 22 slides in cooperation with the outer surface of the other sub-tube 10. Of course, one or more sliding members 20 may be fixed on one sub-tube 10 and slide in cooperation with the inner surface of the other sub-tube 10, and one or more other sliding members 20 may also be fixed on one sub-tube 10 and slide in cooperation with the outer surface of the other sub-tube 10, that is, two cooperation modes exist at the same time.

[0048] It should be noted that the connection method between the sliding member 20 and the sub-tube 10 is not limited to this. In some other embodiments, in two adjacent sub-tubes 10, the patch portion 21 of the sliding member 20 is connected to one of the sub-tubes 10, and the patch portion 21 can be plugged or clamped with the sub-tube 10, or can be embedded in the outer surface of the sub-tube 10, and the slide portion 22 is slidably matched with the inner surface of the other sub-tube 10. In this way, the patch portion 21 is fixed to the sub-tube 10, and the slide portion 22 is fixed to the patch portion 21, and the technical effect of the technical solution of connecting the slide portion 22 to the sub-tube 10 and sandwiching the patch portion 21 between the slide portion 22 and the sub-tube 10 can also be achieved. Optionally, in some other embodiments, in two adjacent sub-tubes 10, the patch portion 21 is connected to one of the sub-tubes 10, and the slide portion 22 is slidably matched with the outer surface of the other sub-tube 10. Of course, one or more sliding members 20 may be fixed on one sub-tube 10 and slideably cooperate with the inner surface of another sub-tube 10, while another one or more sliding members 20 may also be fixed on one sub-tube 10 and slideably cooperate with the outer surface of another sub-tube 10, that is, two cooperation modes exist at the same time.

[0049] Optionally, in one embodiment, see Figures 4 to 8 A connecting through hole 2101 is provided on the patch part 21, and a plug-in hole 101 is provided on the sub-tube 10, which can be a blind hole or a through hole. A plug-in part 2201 is convexly provided on one side of the slide part 22 close to the patch part 21, and the plug-in part 2201 can be a protrusion, a convex column, etc. The plug-in part 2201 passes through the connecting through hole 2101 and is plugged into the plug-in hole 101. With such arrangement, the slide portion 22 passes through the connecting through hole 2101 on the patch portion 21 through its plug-in portion 2201 and is plugged into the plug-in hole 101 of the sub-tube 10 to realize the installation of the slide portion 22 and the patch portion 21. The installation is convenient, and the slide portion 22 and the patch portion 21 can be arranged separately; and, through the cooperation between the plug-in portion 2201 and the plug-in hole 101, the plug-in portion 2201 and the plug-in hole 101 can move relatively, which is beneficial for the slide portion 22 to move and squeeze the patch portion 21 when a force is applied, so as to facilitate the deformation of the patch portion 21 under force.

[0050] In one embodiment, see Figures 4 to 8 One or more oil storage holes 2202 are provided on the side of the slide part 22 away from the patch part 21, which can be blind holes or through holes. In this way, the oil storage holes 2202 provided on the side where the slide part 22 and the sub-tube 10 are slidably matched can store some lubricating oil, which is conducive to smoother sliding fit between the slide part 22 and the sub-tube 10.

[0051] In one embodiment, see Figures 4 to 8The outer tube assembly 100 further includes at least one sealing member 30, which is disposed at the end of the sub-tube 10 and supported between two adjacent sub-tubes 10 to support the two adjacent sub-tubes 10 and prevent external dust, impurities, etc. from entering between the two sub-tubes 10, thereby ensuring smooth relative sliding between the two sub-tubes 10. Specifically, the sealing member 30 may be an annular body or a sleeve-shaped body, and the sealing member 30 may have a snap-fitting portion 31. The inner surface of the sub-tube 10 may be provided with a snap-fitting portion 11. The snap-fitting portion 31 of the sealing member 30 may extend between the two adjacent sub-tubes 10 and fit with the snap-fitting portion 11 of the sub-tube 10. The locking parts 31 and 31 are engaged with each other, thereby realizing the quick installation and connection of the sealing member 30. For example, the locking part 31 includes a spring sheet part and a protrusion provided on the spring sheet part, and the locking fitting part 11 is a slot. Of course, the two can also be opposite, that is, the locking part 31 includes a spring sheet and a slot provided on the spring sheet, and the locking fitting part 11 is a protrusion. The sliding member 20 is arranged on the end of the sub-tube 10 away from the sealing member 30, and is arranged close to the end of the sub-tube 10. Specifically, the sliding member 20 can be arranged on the outer wall of the sub-tube 10 close to the end of the sub-tube 10, that is, when the two adjacent sub-tubes 10 are in a retracted state or a contracted state, along the length direction of the sub-tube 10, the sealing member 30 and the sliding member 20 are respectively located at the opposite ends of the sub-tube 10, so that when the sub-tube 10 slides relative to the other sub-tube 10, the sliding member 20 can always be located between the two adjacent sub-tubes 10 along the sliding stroke of the sub-tube 10.

[0052] It should be noted that, in some other embodiments, the sliding member 20 may also be disposed close to the sealing member 30 , and the sliding member 20 may also not be disposed close to the end of the sub-tube 10 .

[0053] In one embodiment, see Figures 4 to 8 The outer tube assembly 100 also includes a connector 40, which is covered on the end of the innermost sub-tube 10 of the outer tube assembly 100 and can seal the top end of the sub-tube 10 to prevent dust and other foreign matter from entering the interior of the sub-tube 10 and affecting the normal operation of the linear motor. In addition, the connector 40 can be used to connect to an object that needs to be lifted or lowered in the outside world, thereby playing a connecting role.

[0054] Please refer to Figure 1 and Figure 2In one embodiment, the transmission device 201 includes a transmission assembly 204 and a driving mechanism 205. The transmission assembly 204 includes a fixed screw 208 provided with a first external thread 206, a transmission screw 209 with a hollow structure, and a transmission nut 210 provided at one end of the transmission screw 209. The transmission screw 209 and the transmission nut 210 are both sleeved on the fixed screw 208, and the internal thread of the transmission nut 210 matches the first external thread 206, and the transmission screw 209 is connected to the innermost sub-tube 10 of the outer tube assembly 100. Here, the inner surface of the transmission nut 210 has an internal thread, and the internal thread of the transmission nut 210 matches the first external thread 206. The power output end of the driving mechanism 205 is connected to the transmission assembly 204. Here, the power output end of the driving mechanism 205 can be connected to the fixed screw 208 of the transmission assembly 204, and can also be connected to the transmission screw 209 of the transmission assembly 204. When connected to the fixed screw 208, the transmission screw 209 is driven to rotate and / or move through the fixed screw 208. At this time, the fixed screw 208 is rotatable, that is, the power output end of the driving mechanism 205 outputs power to drive the fixed screw 208 to rotate around the axis. At the same time, the internal thread of the transmission nut 210 cooperates with the first external thread 206 to make the transmission screw 209 rotate while making a linear motion along the axial direction of the fixed screw 208 (that is, the axial direction of the fixed screw 208), thereby realizing the relative lifting or extension of the fixed screw 208 and the transmission screw 209, and finally driving the sub-tube 10 set on the transmission screw 209 to achieve lifting or extension. Alternatively, the fixed screw 208 is fixed and remains relatively still with the driving mechanism 205. At this time, the power output end of the driving mechanism 205 is connected to the transmission screw 209, which drives the transmission screw 209 and the transmission nut 210 to rotate around the axis relative to the fixed screw 208, that is, the internal thread of the transmission nut 210 is adapted to the first external thread 206 of the fixed screw 208. Finally, the transmission screw 209 performs rotational motion while performing linear motion along the axial direction of the fixed screw 208 (that is, the axial direction of the fixed screw 208).

[0055] Please refer to Figures 1 to 3Preferably, in one embodiment, the interior of the fixed screw 208 is a hollow structure, and the driving mechanism 205 is arranged inside the fixed screw 208, and the power output end of the driving mechanism 205 extends to the outside of the fixed screw 208 and is connected to the transmission assembly 204. In this way, the driving mechanism 205 is arranged inside the fixed screw 208, does not occupy the external space, can improve the space utilization rate, and is more conducive to driving the transmission screw 209 to rotate relative to the fixed screw 208, shortening the connection and matching length between the driving mechanism 205 and the transmission assembly 204, and improving the transmission stability. Specifically, the driving mechanism 205 includes a power unit 211 fixed inside the fixed screw 208. At this time, the power output shaft of the power unit 211 is directly extended from the fixed screw 208 and connected to the inner wall of the transmission screw 209, so as to drive the transmission screw 209 to rotate around the axis relative to the fixed screw 208. Alternatively, the driving mechanism 205 includes a power unit 211 and a linkage member 212, the power unit 211 is fixed to the fixed screw 208, specifically, the power unit 211 can be fixed inside the fixed screw 208, for example, the power unit 211 can be fixed inside the fixed screw 208 by means of clamping, welding, threaded connection, screw or bolt connection, etc., but not limited thereto. Here, the linkage member 212 cooperates with the inner wall of the transmission screw 209, that is, it can ensure that the transmission screw 209 is driven to rotate around the axis, and does not hinder the transmission screw 209 from telescopically moving relative to the fixed screw 208 in the axial direction.

[0056] Specifically, the power unit 211 is a motor having a power output shaft. It can be understood that the power output shaft of the motor directly drives the transmission screw 209 to move and / or rotate relative to the fixed screw 208. Alternatively, the power unit 211 includes a motor 213 and a gear box 214. The motor 213 is installed inside the fixed screw 208. The input end of the gear box 214 is connected to the output shaft of the motor 213. The gear box 214 has a power output shaft. Specifically, the motor 213 and the gear box 214 are both fixed inside the fixed screw 208. It can be understood that the gear box 214 can adopt any of the existing gear boxes 214. When working, through the action of the power unit 211, the power of the motor 213 is transmitted from its output shaft to the gear box 214, and then transmitted to the power output shaft by the gear set inside the gear box 214, and then transmitted to the linkage 212.

[0057] Please refer to Figure 1 and Figure 2In one embodiment, the outer surface of the transmission screw 209 is provided with a second external thread 207 adapted to the sub-tube 10 of the outer tube assembly 100. The driving mechanism 205 drives the transmission screw 209 to rotate relative to the fixed screw 208. Under the cooperation of the internal thread of the transmission nut 210 and the first external thread 206, the transmission screw 209 can rotate and move linearly along the axial direction of the fixed screw 10 (i.e., the axial direction of the fixed screw 10) to realize the lifting or extension of the transmission screw 209. At the same time, the rotation of the transmission screw 209 can drive the thread to cooperate with the second external thread 207 through its second external thread 207. The sub-tube 10 makes a linear motion along the axial direction of the transmission screw 209, so that the sub-tube 10 threadedly engaged with the second external thread 207 moves axially relative to the transmission screw 209 while following the axial movement of the transmission screw 209 relative to the fixed screw 10, that is, while the transmission screw 209 moves relative to the fixed screw 208, the sub-tube 10 threadedly engaged with the second external thread 207 moves relative to the transmission screw 209, thereby realizing the rapid lifting or extension or telescopic movement of the sub-tube 10 threadedly engaged with the second external thread 207, and further realizing the rapid lifting or extension or telescopic movement of the lifting column, electric push rod and other devices using the linear motor 200, effectively improving the lifting or telescopic efficiency.

[0058] In one embodiment, the rotation direction of the second external thread 207 is opposite to that of the first external thread 106, so that the movement direction of the sub-tube 10 threadedly connected to the second external thread 207 during linear motion is consistent with the movement direction of the transmission screw 209 during linear motion, thereby achieving the sub-tube 10 threadedly connected to the second external thread 207 and the transmission screw 209 to rise and fall or extend in the same direction at the same time; wherein, the rotation direction refers to the direction of thread screwing in, and the thread screwed in when rotating clockwise is called a right-hand thread, and the thread screwed in when rotating counterclockwise is called a left-hand thread.

[0059] Please refer to Figure 2 and Figure 3 In one embodiment, the control assembly 202 includes a control circuit board 215, which is installed in the fixed screw rod 208 and is electrically connected to the power supply assembly 203. It can be understood that the internal space of the fixed screw rod 208 is fully utilized, and the control circuit board 215 is built into the fixed screw rod 208. In this way, the control circuit board 215 is electrically connected to the drive mechanism 205 through the internal wiring of the fixed screw rod 208. In this way, the wiring is clear and convenient for later maintenance and inspection. At the same time, the use of the internal wiring method does not interfere with the lifting or extension of each sub-tube 10 of the outer tube assembly 100, and the lifting or extension is smoother.

[0060] Please refer to Figures 1 to 3In one embodiment, the outer tube assembly 100 also includes a base 216 covering the open end of the outermost sub-tube 10 and a centering piece 217 provided on the base 216, and the centering piece 217 is inserted into the fixed screw 208. Here, the outer surface shape of the centering piece 217 matches the inner surface shape of the cavity of the fixed screw 208 to limit the relative rotation between the fixed screw 208 and the centering piece 217; wherein the centering piece 217 is a cylindrical centering piece 217, and the purpose of rapid installation and positioning is achieved at this time. For example, the centering piece 217 can be a prism (for example, a quadrangular prism), can be a convex column with an elliptical cross-section, or can be a convex column with other regular or irregular shapes. At this time, in addition to achieving the purpose of rapid positioning, it can also prevent the fixed screw 208 from rotating or moving. It can be understood that the outermost sub-tube 10 and the base 216 enclose a blocked space and are relatively stationary with the adjacent inner sub-tubes 10, that is, the adjacent inner sub-tubes 10 are lifted or retracted relative to the outermost sub-tube 10 in the tube length direction. At the same time, the centering piece 217 is adapted to the fixed screw rod 208 to prevent the fixed screw rod 208 from swinging or moving relative to the base 216, thereby improving the stability of the fixed screw rod 208.

[0061] It should be noted that in some other embodiments, the centering piece 217 may not be provided. For example, the fixed screw rod 208 and the base 216 are directly fixedly connected by screws, bolts, rivets, welding, etc.

[0062] Please refer to Figure 2 and Figure 3 In one embodiment, the control component 202 includes a control circuit board 215, which is electrically connected to the power supply component 203; a first support member 218 and a second support member 219, both of which are hollow structures, and a fixed tube 220 whose opposite ends are respectively connected to the first support member 218 and the second support member 219, a centering member 217 is inserted into the second support member 219, the control circuit board 215 is placed in the fixed tube 220, and the opposite ends of the control circuit board 215 are respectively connected to the first support member 218 and the second support member 219. It can be understood that the first support member 218, the fixed tube 220 and the second support member 219 are combined to form a hollow tube body structure, that is, the tube body structure is used to support and protect the control circuit board 215 to prevent the control circuit board 215 from directly contacting the inner wall of the fixed screw rod 208. At the same time, the three-section detachable structure is more conducive to the rapid disassembly and assembly of the control circuit board 215. For example, plug-in slots are provided at the opposite ends of the control circuit board 215, and support portions compatible with the plug-in slots are provided on the inner walls of the first support member 218 and the second support member 219. In this way, the fixed tube 220 can be well fixed in it when the two support members are disassembled and assembled.

[0063] In one embodiment, the power supply assembly 203 is a rechargeable power supply assembly and / or a plug-in power supply assembly. It can be understood that the rechargeable power supply assembly is a battery with energy storage function, and the plug-in power supply assembly is a power supply mechanism with a power plug and draws power from an external power supply. According to actual use requirements, the power supply assembly can be a rechargeable power supply assembly, a plug-in power supply assembly, or both.

[0064] Please refer to Figure 2 In one embodiment, when the power supply assembly 203 is a rechargeable power supply assembly, a plug-in structure 221 is installed on the base 216, and the power supply assembly 203 is plugged into the plug-in structure 221. It can be understood that according to the selection of the plug-in direction of the power supply assembly 203, the slot of the plug-in structure 221 can be opened in the vertical direction or the horizontal direction, so that the power supply assembly 203 can be quickly positioned.

[0065] Please refer to Figures 1 to 3 In one embodiment, the linear motor includes a limiting mechanism, which includes a mechanical limiting mechanism 222 and / or an electronic limiting mechanism 223. Here, the limiting mechanism is used to limit the downward limit position of the transmission nut relative to the fixed screw in the axial direction.

[0066] Specifically, the mechanical limiting mechanism 222 is a stopper provided on the outside of the fixed screw. Here, the function of the stopper is to limit the lower limit position of the transmission nut 210. A step groove is provided on the outer wall of the fixed screw 208, and the stopper is fixed at the step groove, that is, the portion protruding to the outside of the fixed screw 208 is used to block the transmission nut 210, thereby limiting the downward limit position of the innermost sub-tube 10 of the outer tube assembly 100. In this way, an accommodation space can also be formed below the stopper, and the accommodation space is formed by the base 216, the inner side wall of the outermost sub-tube 10 and the bottom end of the remaining sub-tubes 10. The power supply assembly 203 can be placed in the accommodation space. In addition, the mechanical limiting mechanism 222 can also be a limit ring, a limit block, etc.

[0067] Please refer to Figures 1 to 3In one embodiment, the base 216 is provided with an electronic limit mechanism 223 for limiting the lower limit position of the transmission nut 210, and the electronic limit mechanism 223 is electrically connected to the control component 202. It can be understood that the electronic limit mechanism 223 is a limit switch, that is, when the transmission nut 210 moves downward to the limit position, the transmission nut 210 will touch the limit switch and the circuit board mechanism will send a corresponding instruction to the control component 202, and the control component 202 will control the drive mechanism 205 of the transmission device 201 to stop power output, that is, once the transmission nut 210 triggers the limit switch, the drive mechanism 205 will stop working to prevent the innermost sub-tube 10 from moving downward excessively. Similarly, the electronic limit mechanism 223 erected on the base 216 needs a corresponding accommodation space, which is formed by the base 216, the inner side wall of the outermost sub-tube 10 and the bottom end of the remaining sub-tubes 10. At the same time, the accommodation space can be used to place the power supply component 203.

[0068] Please refer to Figure 1 and Figure 3 In one embodiment, a guide member 224 is provided between the transmission screw 209 and the innermost sub-tube 10 of the outer tube assembly 100, and an end cap 225 for axially limiting the guide member 224 is provided at one end of the transmission screw. Here, the guide member 224 is used to improve the stability of the transmission screw moving in the axial direction in the sub-tube 10, that is, to ensure that the two do not move relative to each other in the moving direction. The outer contour of the guide member 224 is adapted to the inner wall contour of the sub-tube 10. For example, the guide member 224 is a square plate that can be adapted to the square inner wall of the sub-tube 10. And, the function of the end cap 225 is to limit the guide member 224 in the axial direction of the transmission screw to prevent the guide member 224 from separating from the transmission screw. Specifically, the end cap 225 is connected to one end of the transmission screw by a snap-on connection.

[0069] In the second aspect, the present application also provides a device using a linear motor, including the above-mentioned linear motor 200. Among them, the linear motor 200 is used to provide lifting, and the device using the linear motor is a device that needs to realize the lifting function, such as a lifter, a lifting platform, a lifting table, etc., but not limited thereto.

[0070] The device using a linear motor provided by the present invention, based on the above-mentioned linear motor 200, has a more compact overall size and can be adapted to more scenarios.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A linear motor, characterized in that: The linear motor comprises: The outer tube assembly comprises at least two sub-tubes which are sequentially sleeved from the inside to the outside, and the two adjacently sleeved sub-tubes can move relative to each other along the tube length direction of the sub-tubes themselves; A transmission device, which is arranged in the outer tube assembly and is used to drive the sub-tubes of the outer tube assembly to move relative to each other; a control assembly, the control assembly being disposed in the sub-tube of the outer tube assembly and being electrically connected to the transmission device; and, A power supply assembly, the power supply assembly is disposed in the sub-tube of the outer tube assembly and is electrically connected to the control assembly; Wherein, the transmission device includes a transmission assembly and a driving mechanism, the transmission assembly includes a fixed screw with a first external thread, a transmission screw with a hollow structure, and a transmission nut arranged at one end of the transmission screw, the transmission screw and the transmission nut are both sleeved on the fixed screw, and the internal thread of the transmission nut matches the first external thread, the transmission screw is connected to the innermost sub-tube of the outer tube assembly; the power output end of the driving mechanism is connected to the transmission assembly, and is used to drive the fixed screw and the transmission screw to rotate and / or move relative to each other; The fixed screw has a hollow structure, and the driving mechanism is built into the fixed screw. The driving mechanism includes a power part fixed in the fixed screw, and the power part has a power output shaft extending from the fixed screw and matching with the inner wall of the transmission screw; or, the driving mechanism includes a power part fixed in the fixed screw and a linkage part, and the power part has a power output shaft extending from the fixed screw, and the linkage part is connected to the power output shaft and matches with the inner wall of the transmission screw; the power part is a motor, and the motor has the power output shaft; or, the power part includes a motor and a gear box connected to the output shaft of the motor, and the gear box has the power output shaft.

2. The linear motor according to claim 1, characterized in that: The control assembly includes a control circuit board, which is installed in the fixed screw rod and is electrically connected to the power supply assembly; Alternatively, the control component includes a control circuit board, which is electrically connected to the power supply component; the fixed screw rod is provided with a first support member, a second support member, and a fixed tube whose opposite ends are respectively connected to the first support member and the second support member, both of which are hollow structures; the control circuit board is placed in the fixed tube, and the opposite ends of the control circuit board are respectively connected to the first support member and the second support member.

3. The linear motor according to claim 1, characterized in that: The outer tube assembly also includes a base covering the open end of the outermost sub-tube and a centering piece arranged on the base, and the centering piece is inserted into the fixed screw rod.

4. The linear motor according to claim 1, characterized in that: The power supply assembly is a rechargeable power supply assembly and / or a plug-in power supply assembly.

5. The linear motor according to claim 3, characterized in that: The linear motor comprises a limiting mechanism, and the limiting mechanism comprises a mechanical limiting mechanism and / or an electronic limiting mechanism.

6. The linear motor according to claim 5, characterized in that: The mechanical limit mechanism is a stopper, which is arranged on the outer side of the fixed screw and is used to limit the lower limit position of the movement of the transmission nut; the electronic limit mechanism is a limit switch, which is arranged on the base and is used to limit the lower limit position of the movement of the transmission nut, and the limit switch is electrically connected to the control component.

7. The linear motor according to claim 1, characterized in that: A guide piece is provided between the transmission screw and the innermost sub-tube of the outer tube assembly, and an end cover for axially limiting the guide piece is provided at one end of the transmission screw.

8. A device using a linear motor, characterized in that: Comprising a linear motor as claimed in any one of claims 1 to 7.

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