Linear motor and device using linear motor

Abstract

The present application relates to the field of lifting technology, and provides a linear motor and a device using the linear motor, the linear motor comprising: a transmission device comprising: a fixed screw rod, an outer surface of the fixed screw rod being provided with a first outer thread; a driving screw rod, the driving screw rod being hollow and an inner surface of the driving screw rod being provided with a first inner thread, the driving screw rod being sleeved on the fixed screw rod, and the first inner thread being matched with the first outer thread; an outer surface of the driving screw rod being provided with a second outer thread; a driving mechanism, a power output end of the driving mechanism being connected with the driving screw rod; a first outer pipe, the first outer pipe being sleeved on the fixed screw rod; a second outer pipe, the second outer pipe being located inside the first outer pipe and sleeved on the driving screw rod and connected with the driving screw rod; and a third outer pipe, the third outer pipe being located inside the second outer pipe and connected with the second outer thread of the driving screw rod. The linear motor provided by the present application can effectively improve the lifting efficiency of the linear motor and occupies a small space.

Description

Technical Field

[0001] The present invention relates to the field of lifting 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 drive the lifting of components such as outer tubes. They are often used in devices that need to achieve lifting functions, such as lifting tables, lifting chairs, lifting platforms, and lifting equipment.

[0003] Existing linear motors are usually provided with multi-stage outer tubes to achieve multi-stage lifting. However, the transmission device of the linear motor is usually driven step by step, so that the outer tube and other components are lifted and lowered step by step, resulting in low lifting efficiency. Summary of the Invention

[0004] One object of the present invention is to provide a linear motor to improve the technical problem of low lifting efficiency in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a linear motor, the linear motor includes: a transmission device, the transmission device includes: a fixed screw, the outer surface of the fixed screw is provided with a first external thread; an active screw, the interior of the active screw is hollow, the inner surface of the active screw is provided with a first internal thread, the active screw is sleeved on the fixed screw, and the first internal thread cooperates with the first external thread; the outer surface of the active screw is provided with a second external thread; and a driving mechanism, the power output end of the driving mechanism is connected to the active screw, for driving the active screw to rotate relative to the fixed screw; a first outer tube, the first outer tube is sleeved on the fixed screw; a second outer tube, the second outer tube is located inside the first outer tube and sleeved on the active screw, the second outer tube is connected to the active screw so as to be able to move with the active screw; and a third outer tube, the third outer tube is located inside the second outer tube, the third outer tube is connected to the second external thread of the active screw so as to be able to move along the axial direction of the active screw.

[0006] In one embodiment, the drive mechanism is arranged on the fixed screw; and / or the interior of the fixed screw is hollow, the drive mechanism is arranged inside the fixed screw, and the power output end of the drive mechanism extends to the outside of the fixed screw and is connected to the active screw.

[0007] In one embodiment, the rotation direction of the second external thread is opposite to that of the first external thread; and / or, the first internal thread is provided on a portion of the inner surface of the active screw rod close to the end of the active screw rod.

[0008] In one embodiment, the interior of the fixed screw is hollow, and the linear motor further includes: a mounting cylinder, which is arranged inside the fixed screw; and a control board, which is arranged inside the mounting cylinder and is electrically connected to the driving mechanism for controlling the driving mechanism.

[0009] In one embodiment, the mounting tube includes: a barrel portion; a first support portion, the first support portion is connected to one end of the barrel portion; and a second support portion, the second support portion is connected to the other end of the barrel portion; wherein the control panel is located inside the barrel portion, and the two ends of the control panel are respectively connected to the first support portion and the second support portion.

[0010] In one embodiment, the inner surface of the fixed screw is provided with a third limiting portion along the axial direction of the fixed screw, the outer surface of the first support portion is provided with a third limiting matching portion adapted to the third limiting portion, and / or the outer surface of the second support portion is provided with a fourth limiting matching portion adapted to the third limiting portion.

[0011] In one embodiment, the inner surface of the active screw is provided with a first limiting portion along the axial direction of the active screw, and the driving mechanism includes: a power part, which is fixed to the fixed screw, and the power part has a power output shaft; and a linkage part, which is fixed to the power output shaft and is located inside the active screw, and the linkage part has a first limiting fitting part, and the first limiting fitting part is slidably fitted with the first limiting part.

[0012] In one embodiment, the power unit is a first motor; or, the power unit includes: a second motor, the second motor is fixed to the fixed screw; and a first gear box, the first gear box is connected to the output shaft of the second motor, and the first gear box has a power output shaft.

[0013] In one embodiment, the linear motor further includes a power supply assembly, which is disposed inside the first outer tube and is electrically connected to the drive mechanism; and / or, the end of the third outer tube is sealed with a connector; and / or, the transmission device further includes a fixing portion, one end of the fixed screw is fixed to the fixing portion, and one end of the first outer tube is fixed to the fixing portion; the fixing portion has a groove, and one end of the fixed screw is inserted into the groove.

[0014] In one embodiment, one end of the second outer tube is connected to the active screw through a bearing; or, one end of the active screw has a flange, and the linear motor further includes: a guide portion, the guide portion is sleeved on the active screw, and one end of the second outer tube is connected to the guide portion; and an end face bearing, the end face bearing is located between the guide portion and the flange and connected to the guide portion and the flange; wherein the outer surface of the guide portion and / or the second outer tube cooperates with the inner surface of the first outer tube to limit the relative rotation of the guide portion and the first outer tube.

[0015] In one embodiment, the transmission device also includes a plurality of screw layer assemblies, and each screw layer assembly is assembled in sequence from the inside to the outside, and the innermost screw layer assembly is sleeved on the active screw; the third outer tube is connected to the outermost screw layer assembly; the active screw can drive each screw layer assembly to rotate and move along the axial direction of the active screw.

[0016] In one embodiment, the transmission device further comprises a guide support rotatably connected to one end of the driving screw, and an outer surface of the guide support is matched with an inner surface of the third outer tube to limit relative rotation between the guide support and the third outer tube.

[0017] Another object of the present application is to provide a device using a linear motor, which comprises the linear motor of any of the above embodiments.

[0018] The one or more technical solutions described above in the embodiments of the present application have at least the following technical effects or advantages:

[0019] The linear motor provided by the embodiments of the present application has the following advantages: the transmission device, the first outer tube, the second outer tube and the third outer tube are provided, the transmission device comprises a fixed screw, a driving screw which is internally hollow and is sleeved on the fixed screw, and a driving mechanism connected to the driving screw, an outer surface of the fixed screw is provided with a first outer thread, an inner surface of the driving screw is provided with a first inner thread matched with the first outer thread, an outer surface of the driving screw is provided with a second outer thread, the third outer tube, the second outer tube and the first outer tube are sequentially sleeved from inside to outside, the second outer tube is connected to the driving screw, the third outer tube is connected to the second outer thread of the driving screw, the driving mechanism drives the driving screw to rotate relative to the fixed screw, the driving screw simultaneously moves linearly along the fixed screw in the axial direction under the cooperation of the first inner thread and the first outer thread, the driving screw drives the second outer tube to move up and down relative to the first outer tube, at the same time, the rotation of the driving screw drives the third outer tube to move linearly along the driving screw in the axial direction through the second outer thread, so that the third outer tube moves up and down relative to the second outer tube while moving along the driving screw in the axial direction relative to the fixed screw, the second outer tube and the third outer tube are simultaneously lifted, and the lifting efficiency of the linear motor is effectively improved; and the inner surface of the driving screw is directly provided with the first inner thread which is threadedly matched with the first outer thread of the fixed screw to rotate and move linearly relative to the fixed screw, so that the transmission device occupies a small space of the linear motor, thereby facilitating the reduction of the size of the linear motor. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The structural schematic diagram of the linear motor provided by the embodiments of the present application is shown in the figure.

[0022] Figure 2 A schematic diagram of the exploded structure of a linear motor provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the exploded structure of a transmission device provided in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a top view of the linear motor provided in an embodiment of the present invention;

[0025] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure in the AA direction;

[0026] Figure 6 A schematic diagram of the structure of the fixed screw rod and the driving mechanism provided in an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of the structure of the active screw rod and the screw rod nut provided in an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the main structure of the active screw rod and the screw rod nut provided in an embodiment of the present invention;

[0029] Figure 9 for Figure 8 Schematic diagram of the cross-sectional structure in the middle BB direction.

[0030] Among them, the reference numerals in the figures are:

[0031] 1000, linear motor; 100, transmission device; 200, first outer tube; 210, first sealing member; 300, second outer tube; 310, second sealing member; 400, third outer tube; 430, connecting member; 500, guide portion; 600, end bearing; 700, mounting tube; 710, cylinder portion; 720, first support portion; 7201, third position-limiting fitting portion; 7301, fourth position-limiting fitting portion; 730, second support portion; 800, control board; 900, power supply assembly; 1 0. Fixed screw; 101. First external thread; 102. Third limiting portion; 20. Active screw; 110. Support plate; 21. Flange; 201. First internal thread; 202. Second external thread; 30. Screw nut; 40. Driving mechanism; 203. First limiting portion; 41. Power unit; 410. Power output shaft; 42. Linkage; 420. First limiting fitting portion; 411. Second motor; 412. First gearbox; 50. Fixed portion; 51. Groove; 60. Guide support portion. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail, 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 are not to be construed as limiting the present invention.

[0033] 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 accompanying 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 limiting the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] See also Figure 1 、 Figure 2 、 Figure 5 and Figure 9 The present invention provides a linear motor 1000 that can be used in devices that require lifting functions, such as lifters, lifting platforms, and lifting tables, but is not limited thereto. The linear motor 1000 includes a transmission device 100, a first outer tube 200, a second outer tube 300, and a third outer tube 400. The transmission device 100 is used for lifting transmission to drive the second outer tube 300 and the third outer tube 400 to lift and lower simultaneously. The transmission device 100 includes a fixed screw 10, an active screw 20, and a drive mechanism 40, wherein:

[0037] The fixed screw rod 10 can be fixed, that is, it does not perform rotational motion or linear motion. The outer surface of the fixed screw rod 10 is provided with a first external thread 101; the first outer tube 200 is sleeved on the fixed screw rod 10 and can be fixed to one end of the fixed screw rod 10. Of course, it can also be connected to other components without being fixedly connected to the fixed screw rod 10. The first outer tube 200 is tubular and hollow inside. The first outer tube 200 is located at the outermost layer of the linear motor 1000 and can be regarded as the outer shell of the linear motor 1000.

[0038] The interior of the active screw rod 20 is hollow, and the inner surface of the active screw rod 20 is provided with a first internal thread 201. The first internal thread 201 can be provided on the entire inner surface of the active screw rod 20 along the axial direction of the active screw rod 20 (that is, the axial direction of the active screw rod 20), or the first internal thread 201 can be provided on only a certain part of the inner surface of the active screw rod 20. The first internal thread 201 can be directly processed and formed on the inner surface of the active screw rod 20, that is, the first internal thread 201 and the active screw rod 20 are integrally formed; the active screw rod 20 is sleeved on the fixed screw rod 10, and the first internal thread 201 cooperates or screws with the first external thread 101, so that the active screw rod 20 can pass through the first internal thread when it rotates relative to the fixed screw rod 10. The thread 201 and the first external thread 101 are screwed together to make a linear motion relative to the fixed screw rod 10; the outer surface of the active screw rod 20 is provided with a second external thread 202, which can be used to cooperate with the thread of an external object to drive the external object to move, wherein the external object can be a screw nut, a hollow screw rod or other components to be driven; the second outer tube 300 is tubular and hollow inside, the second outer tube 300 is located inside the first outer tube 200 and is sleeved on the active screw rod 20, and the second outer tube 300 is connected to the active screw rod 20 so as to be able to move with the active screw rod 20. When the active screw rod 20 makes a linear motion relative to the fixed screw rod 10, the second outer tube 300 can make a linear motion at the same time with the active screw rod 20, so that it can be raised and lowered relative to the first outer tube 200. The third outer tube 400 is tubular and hollow inside. The third outer tube 400 is located inside the second outer tube 300. The third outer tube 400 is connected to the second external thread 202 of the active screw rod 20 so that it can be driven by the second external thread 202 to move along the axial direction of the active screw rod 20, thereby being able to rise and fall relative to the second outer tube 300. The third outer tube 400 can be connected to the second external thread 202 through an external object (such as a screw nut, a screw layer assembly, etc.) as an intermediate component, and of course it can also be directly threadedly connected to the second external thread 202 of the active screw rod 20.

[0039] The power output end of the driving mechanism 40 is connected to the active screw 20, and is used to drive the active screw 20 to rotate relative to the fixed screw 10; wherein, the driving mechanism 40 refers to a mechanism or device that can provide driving force and can drive the active screw 20 to rotate relative to the fixed screw 10. For example, the driving mechanism 40 may include a motor and a transmission member connected to the output end of the motor. The driving force is provided by the motor, so that the transmission member drives the active screw 20 to rotate relative to the fixed screw 10.

[0040] The linear motor 1000 provided in the embodiment of the present application is provided with a transmission device 100, a first outer tube 200, a second outer tube 300 and a third outer tube 400, and the transmission device 100 includes a fixed screw 10, an active screw 20 which is hollow inside and sleeved on the fixed screw 10, and a driving mechanism 40 connected to the active screw 20 at the power output end, and the outer surface of the fixed screw 10 is provided with a first external thread 101, and the inner surface of the active screw 20 is provided with a first internal thread 20 which matches the first external thread 101. 1, the outer surface of the active screw rod 20 is provided with a second external thread 202, the third outer tube 400, the second outer tube 300, and the first outer tube 200 are sequentially sleeved from the inside to the outside, and the first outer tube 200 is fixed to the fixed screw rod 10, the second outer tube 300 is connected to the active screw rod 20, and the third outer tube 400 is connected to the second external thread 202 of the active screw rod 20. The active screw rod 20 is driven by the driving mechanism 40 to rotate relative to the fixed screw rod 10. Under the cooperation of the first internal thread 201 and the first external thread 101, the active screw rod 20 can be rotated. The movable screw 20 rotates and simultaneously moves linearly along the axial direction of the fixed screw 10 (i.e., the axial direction of the fixed screw 10), thereby realizing the lifting and lowering of the active screw 20. The active screw 20 drives the second outer tube 300 to lift and lower relative to the first outer tube 200. At the same time, the rotation of the active screw 20 can drive the third outer tube 400 to move linearly along the axial direction of the active screw 20 through its second outer thread 202, thereby making the third outer tube 400 move axially with the active screw 20 relative to the fixed screw 10. Regarding the axial movement of the active screw rod 20, that is, while the active screw rod 20 moves relative to the fixed screw rod 10, the third outer tube 400 and the external object whose thread is matched with the second external thread 202 move relative to the active screw rod 20, and the third outer tube 400 and the external object whose thread is matched with the second external thread 202 can be quickly lifted and lowered, and the third outer tube 400 is lifted and lowered relative to the second outer tube 300, thereby realizing the simultaneous lifting and lowering of the second outer tube 300 and the third outer tube 400, which can effectively improve the lifting efficiency of the linear motor 1000. In addition, the first internal thread 201 is directly arranged on the inner surface of the active screw rod 20, which can improve the stability and movement consistency between the first internal thread 201 and the active screw rod 20, and prevent relative movement between the active screw rod 20 and the first internal thread 201, thereby improving the matching stability and transmission consistency between the active screw rod 20 and the fixed screw rod 10. At the same time, there is no need to connect a nut on the active screw rod 20 to match the thread of the fixed screw rod 10, which can effectively simplify the structure and reduce the space, so that the transmission device 100 occupies a small space of the linear motor 1000, thereby helping to reduce the volume of the linear motor 1000.

[0041] In one embodiment, see Figure 2 and Figure 3The transmission device 100 also includes a fixing portion 50. The same end of the fixed screw rod 10 and the first outer tube 200 can be fixed to the fixing portion 50. The first outer tube 200 is fixed to the fixed screw rod 10 through the fixing portion 50. Of course, only the fixed screw rod 10 can be fixed to the fixing portion 50 while the first outer tube 200 is not fixed to the fixing portion 50. The fixing portion 50 can be a base. The fixed screw rod 10 and the first outer tube 200 can be fixed to the fixing portion 50 vertically. The fixing portion 50 can also be a base. The fixed screw rod 10 and the first outer tube 200 can be fixed to the fixing portion 50 horizontally. Of course, the fixing portion 50 can also be other structures. With this arrangement, the fixing portion 50 can fixedly connect the fixed screw rod 10 and the first outer tube 200, prevent the fixed screw rod 10 and the first outer tube 200 from moving, and enhance stability.

[0042] It should be noted that, in some other embodiments, the transmission device 100 may not be provided with the fixing portion 50, and the fixed screw 10 may be directly fixed to the linear motor 1000. For example, the fixed screw 10 may be directly fixed to the outer shell of the linear motor 1000 (ie, the first outer tube 200).

[0043] Alternatively, in one embodiment, see Figure 3 The fixing portion 50 has a groove 51, and one end of the fixing screw rod 10 is inserted into the groove 51. In this way, the groove 51 cooperates with the fixing screw rod 10 to prevent the fixing screw rod 10 from swinging or moving relative to the fixing portion 50, thereby improving the stability of the fixing screw rod 10.

[0044] It should be noted that, in some other embodiments, the groove 51 may not be provided. For example, the fixing screw 10 and the fixing portion 50 are directly fixedly connected by screws, bolts, rivets, welding, etc.

[0045] Alternatively, in one embodiment, see Figure 5 and Figure 6 The fixing screw rod 10 is detachably fixed to the fixing portion 50. For example, the fixing screw rod 10 can be fixed to the fixing portion 50 by screws or bolts. This arrangement facilitates the disassembly and installation between the fixing screw rod 10 and the fixing portion 50.

[0046] Alternatively, in one embodiment, see Figure 3 、 Figure 5 and Figure 6 The linear motor 1000 further includes a support plate 110 , which is supported between the fixed screw 10 and the first outer tube 200 to improve stability. The support plate 110 can be located on the fixed screw 10 close to the fixing portion 50 .

[0047] In one embodiment, see Figure 3 and Figure 5, the second external thread 202 is opposite to the first external thread 101 in the direction of rotation, so that the moving direction of the external object and / or the third external tube 400 threadedly fitted with the second external thread 202 is consistent with the moving direction of the driving lead screw 20 when the driving lead screw 20 moves linearly, so that the external object and / or the third external tube 400 threadedly fitted with the second external thread 202 and the driving lead screw 20 move in the same direction at the same time; wherein the direction of rotation refers to the direction of rotation of the thread, the thread rotated clockwise is called right-handed thread, and the thread rotated counterclockwise is called left-handed thread.

[0048] In one embodiment, referring to Figure 5 and Figure 9 , the first internal thread 201 is arranged on the inner surface of the driving lead screw 20 close to the end of the driving lead screw 20, and for the orientation shown in Figure 9 , the first internal thread 201 is arranged on the inner surface of the driving lead screw 20 close to the lower end of the driving lead screw 20, and the part of the inner surface of the driving lead screw 20 without the first internal thread 201 can have a gap between the first external thread 101 of the fixed lead screw 10. In this way, only the first internal thread 201 is machined on the inner surface of the driving lead screw 20 close to the end of the driving lead screw 20, without machining internal threads on the inner surface of the driving lead screw 20, which can effectively reduce the cost and improve the efficiency. If the internal threads are machined on the inner surface of the driving lead screw 20, the process is complex and the cost is high.

[0049] The linear motor in the prior art uses a motor and a plurality of lead screws arranged in sequence to achieve transmission, wherein the innermost lead screw is a solid lead screw and is connected to the output end of the motor. The innermost lead screw is driven to rotate by the motor, and then drives the lead screws arranged outside to move to achieve multi-stage lifting. However, it not only has low lifting efficiency, but also the motor and the transmission mechanism connected between the motor and the innermost lead screw are usually protrudingly arranged at the end of the linear motor, i.e. exposed to the outside of the linear motor. It not only occupies a large space and affects the use and installation of the linear motor on the device where it is applied, but also is not beautiful and affects the user experience.

[0050] To solve the above problems, in one embodiment, referring to Figure 5The driving mechanism 40 is arranged on the fixed screw rod 10. Specifically, the driving mechanism 40 can be arranged outside the fixed screw rod 10 and inside the driving screw rod 20, or the fixed screw rod 10 can be internally hollow, and the driving mechanism 40 can be arranged inside the fixed screw rod 10. In this way, since the fixed screw rod 10 is fixedly arranged, the driving mechanism 40 is arranged on the fixed screw rod 10, which not only facilitates the fixed installation of the driving mechanism 40, but also hides the driving mechanism 40 inside the linear motor 1000 without directly exposing the driving mechanism 40 outside the linear motor 1000, which is not easily affected by the outside world, facilitates the full use of space, makes the installation between components more compact, and makes the end of the linear motor 1000 not have a part protruding due to the motor and other components, which is more elegant and facilitates the use and installation of the linear motor 1000, and can improve the user experience.

[0051] Optionally, in one embodiment, referring to Figure 3 、 Figure 5 and Figure 6 , the fixed screw rod 10 is internally hollow, the driving mechanism 40 is arranged inside the fixed screw rod 10, and the power output end of the driving mechanism 40 extends to the outside of the fixed screw rod 10 and is connected with the driving screw rod 20. Specifically, the driving mechanism 40 can be partially arranged inside the fixed screw rod 10, or all of the driving mechanism 40 except the power output end can be arranged inside the fixed screw rod 10. In this way, the driving mechanism 40 is arranged inside the fixed screw rod 10, which can improve the stability and convenience of the arrangement of the driving mechanism 40, forms a hidden installation, and can appropriately reduce the overall length of the transmission device 100 when it is retracted, without the need for additional installation design considerations due to the arrangement of the driving mechanism 40 outside the fixed screw rod 10 and inside the driving screw rod 20, and the distance between the fixed screw rod 10 and the end of the driving screw rod 20 close to the same end of the driving mechanism 40 is relatively short, which facilitates shortening the length of the linear motor 1000 after it is fully retracted. In addition, it does not occupy external space, can improve the space utilization rate, and the cooperation distance between the power output end of the driving mechanism 40 and the driving screw rod 20 is shorter, which is more conducive to driving the driving screw rod 20 to rotate relative to the fixed screw rod 10, can shorten the connection and cooperation length between the driving mechanism 40 and the driving screw rod 20, and improves the transmission stability.

[0052] Optionally, in one embodiment, referring to Figure 3 and Figures 5 to 7The inner surface of the active screw rod 20 is provided with a plurality of first limit portions 203 along the axial direction of the active screw rod 20. The driving mechanism 40 includes a power unit 41 and a linkage member 42. The power unit 41 is fixed to the fixed screw rod 10. Specifically, the power unit 41 can be fixed to the inside of the fixed screw rod 10. For example, the power unit 41 can be fixed to the inside of the fixed screw rod 10 by means of clamping, welding, threaded connection, screw or bolt connection, but is not limited thereto. The power unit 41 can be partially or completely located inside the fixed screw rod 10. The power unit 41 is located at one end of the fixed screw rod 10 away from the fixed portion 50. The power unit 41 refers to a device that can provide a rotational driving force. The power unit 41 1 has a power output shaft 410, which extends to the outside of the fixed screw rod 10, and a linkage member 42 is fixed on the power output shaft 410 and located inside the active screw rod 20. The linkage member 42 has a plurality of first limiting fitting portions 420, which are slidably engaged with the first limiting portion 203 to limit the relative rotation of the linkage member 42 and the active screw rod 20, and only allow relative linear motion. The linkage member 42 refers to an intermediate power transmission member that can transmit the rotational power of the power output shaft 410 to the active screw rod 20. For example, the linkage member 42 can be a spline, a cylindrical, fan-shaped, or strip-shaped linkage member, or a plurality of other linkage members. The linkage members may be of other regular or irregular shapes; specifically, the first limiting portion 203 may be a convex strip convexly provided on the inner surface of the active screw rod 20 along the axial direction of the active screw rod 20, and the first limiting matching portion 420 may be a slide groove provided on the outer peripheral surface of the linkage member 42. Of course, the first limiting portion 203 may also be a slide groove concavely provided on the inner surface of the active screw rod 20 along the axial direction of the active screw rod 20, and the first limiting matching portion 420 may be a convex strip or protrusion convexly provided on the outer peripheral surface of the linkage member 42. By slidingly matching the slide groove with the convex strip or protrusion, the linkage member 42 and the active screw rod 20 can be restricted from rotating relative to each other, so that the active screw rod 20 can be driven to rotate when the linkage member 42 rotates, and at the same time When the active screw rod 20 makes a linear motion relative to the fixed screw rod 10, it can make a relative linear motion with the linkage member 42; the first limiting portion 203 can also be the polygonal inner surface of the active screw rod 20, for example, a polygonal inner surface with a quadrilateral cross-section, and correspondingly, the first limiting matching portion 420 can be a polygonal outer peripheral surface, for example, a polygonal outer peripheral surface with a quadrilateral cross-section. At this time, the shape of the linkage member 42 can be a polygonal linkage member, and the first limiting matching portion 420 of the polygonal outer peripheral surface of the linkage member 42 and the first limiting portion 203 of the polygonal inner surface of the active screw rod 20 are slidably matched, so that the relative rotation of the linkage member 42 and the active screw rod 20 can be limited.During operation, the power unit 41 is activated, and its power output shaft 410 drives the linkage member 42 to rotate. The linkage member 42 drives the active screw 20 to rotate through the cooperation between the first limiting portion 203 and the first limiting matching portion 420. The active screw 20 makes a linear motion relative to the fixed screw 10 under the cooperation between the first internal thread 201 and the first external thread 101. The active screw 20 and the linkage member 42 then make a relative linear motion. At the same time, the linkage member 42 can support and stabilize the active screw 20. This arrangement is conducive to the drive mechanism 40 stably driving the active screw 20 to simultaneously make rotational motion and linear motion relative to the fixed screw 10, so that the matching structure between the fixed screw 10, the drive mechanism 40 and the active screw 20 is compact and highly stable.

[0053] Alternatively, in one embodiment, see Figure 3 and Figure 5 The power unit 41 includes a second motor 411 and a first gear box 412. The second motor 411 is fixed to the fixed screw 10, and the input end of the first gear box 412 is connected to the output shaft of the second motor 411. The first gear box 412 has a power output shaft 410. Specifically, the second motor 411 and the first gear box 412 can be fixed to the inside of the fixed screw 10, or only the second motor 411 can be partially or completely fixed to the inside of the fixed screw 10 and the first gear box 412 is located outside the fixed screw 10. Of course, the second motor 411 and the first gear box 412 can also be located outside the fixed screw 10 and inside the active screw 20. It can be understood that the first gear box 412 can adopt any type of existing gear box, such as a planetary gear box, but is not limited thereto. When working, the power unit 41 is activated, and the power of the power unit 41 is transmitted from its output shaft to the first gear box 412, and then transmitted to the power output shaft 410 by the gear set inside the first gear box 412, and then transmitted to the linkage 42.

[0054] It should be noted that the structure of the power unit 41 is not limited to this. In some other embodiments, the power unit 41 can be a first motor having a power output shaft, and the linkage 42 is fixed to the power output shaft of the first motor, that is, the power unit 41 can have no first gear box 412 and the linkage 42 can be driven to rotate by the first motor. For example, the first motor can be a reduction motor having a power output shaft.

[0055] It should also be noted that the drive mechanism 40 may not have the linkage 42. Optionally, in some other embodiments, the drive mechanism 40 includes a third motor and a second gearbox, and the third motor is fixed to the fixed screw. Specifically, the third motor may be partially or completely located inside the fixed screw 10, and the second gearbox is connected to the output shaft of the third motor. The second gearbox has a power output end that cooperates with the inner surface of the active screw 20 to drive the active screw 20 to rotate relative to the fixed screw 10, wherein the power output end of the second gearbox can be a rotatable outer shell of the second gearbox, and the inner surface of the outer shell can be provided with internal teeth that mesh with the internal transmission gear of the second gearbox. The second gearbox is driven to work by the third motor, and the internal transmission gear of the second gearbox drives the outer shell of the second gearbox to rotate, so that the second gearbox drives the active screw 20 to rotate; it can be understood that the second gearbox can be any planetary gearbox in the prior art or a planetary gearbox that is improved from the planetary gearbox in the prior art, and the planetary gearbox has a rotatable outer shell. Specifically, the inner surface of the active screw rod 20 is provided with a first limiting portion 203 along the axial direction of the active screw rod 20, and the power output end of the second gear box has a gear box limiting fitting portion, and the gear box limiting fitting portion is slidably fitted with the first limiting portion 203, which can limit the relative rotation between the power output end of the second gear box and the active screw rod 20, and can only make relative linear motion, wherein the gear box limiting fitting portion can adopt the same structure as the above-mentioned first limiting fitting portion 420, which will not be repeated here.

[0056] In one embodiment, see Figure 3 and Figure 5 The interior of the fixed screw 10 is hollow, and the power unit 41 can be arranged inside the fixed screw 10. The linear motor 1000 also includes a mounting tube 700 and a control board 800. The mounting tube 700 is arranged inside the fixed screw 10, and the control board 800 is arranged inside the mounting tube 700. The control board 800 has electronic components and is electrically connected to the drive mechanism 40 for controlling the drive mechanism 40. Specifically, the control board 800 can be electrically connected to the power unit 41 or the third motor for controlling the power unit 41 or the third motor, such as controlling the start, stop, speed, etc. of the power unit 41 or the third motor, but is not limited thereto. In this arrangement, by placing the control board 800 in the mounting tube 700 and the mounting tube 700 being installed inside the fixed screw 10, the drive mechanism 40 can be controlled inside the fixed screw 10, thereby achieving high integration and improving the structural density of the linear motor 1000. There is no need to set up additional control components outside the linear motor 1000. Furthermore, a through hole is provided at the end of the fixed screw rod 10 connected to the first outer tube 200 , and a corresponding through hole is also provided on the first outer tube 200 for passing a power line or other wire to connect the control board 800 and the external circuit or power supply.

[0057] Alternatively, in one embodiment, see Figure 3 and Figure 5 The mounting tube 700 includes a body portion 710, a first support portion 720, and a second support portion 730. The first support portion 720 is connected to one end of the body portion 710, and the second support portion 730 is connected to the other end of the body portion 710. The control board 800 is located inside the body portion 710, and the two ends of the control board 800 are respectively connected to the first support portion 720 and the second support portion 730. Specifically, the two ends of the control board 800 can respectively abut or engage with the first support portion 720 and the second support portion 730. This arrangement facilitates the installation of the control board 800 in the mounting tube 700 and prevents relative rotation between the control board 800 and the mounting tube 700, thereby improving the stability of the placement of the control board 800.

[0058] Alternatively, in one embodiment, see Figure 3 and Figure 5 A plurality of heat dissipation holes are provided on the upper portion of the cylindrical body 710 to dissipate the heat generated by the control panel during operation and improve safety.

[0059] Alternatively, in one embodiment, see Figure 3 and Figure 5 The inner surface of the fixed screw rod 10 is provided with a third limiting portion 102 along the axial direction of the fixed screw rod 10, the outer surface of the first support portion 720 is provided with a third limiting matching portion 7201 adapted to the third limiting portion 102, and the outer surface of the second support portion 730 is provided with a fourth limiting matching portion 7301 adapted to the third limiting portion 102. Of course, only the outer surface of the first support portion 720 can be provided with the third limiting matching portion 7201 adapted to the third limiting portion 102, or only the outer surface of the second support portion 730 can be provided with the fourth limiting matching portion 7301 adapted to the third limiting portion 102; wherein the third limiting portion 102 can be a convex strip, and the third limiting matching portion 7201 and the fourth limiting matching portion 7301 are both sliding grooves; the third limiting portion 102 can be a sliding groove, and the third limiting matching portion 7201 and the fourth limiting matching portion 7301 are both convex strips. With this arrangement, the third limiting portion 102 cooperates with the third limiting matching portion 7201 and the fourth limiting matching portion 7301 to limit relative rotation between the mounting tube 700 and the fixed screw rod 10, thereby improving the stability of the mounting tube 700 and the control board 800 located inside the mounting tube 700.

[0060] In one embodiment, see Figure 3 、 Figure 5 and Figure 6The linear motor 1000 further comprises a power supply assembly 900, which is arranged inside the first outer tube 200. Specifically, the power supply assembly 900 can be arranged between one end of the fixed screw rod 10 and one end of the first outer tube 200, and can be arranged close to the fixed portion 50. Of course, the power supply assembly 900 can also be arranged at other positions in the first outer tube 200. The power supply assembly 900 is electrically connected with the driving mechanism 40. The power supply assembly 900 can also have a power supply line, which can extend to the outside of the first outer tube 200 to be electrically connected with a power supply. The power supply assembly 900 can be used to convert the input power supply voltage into various levels of working voltage required by the driving mechanism 40 or the control board 800. The power supply assembly 900 has a circuit board, an adapter and other components. It can be understood that it can also have other various components required for realizing power supply voltage conversion. Those skilled in the art can arrange them according to actual application requirements. In this way, the power supply assembly 900 is directly built-in in the linear motor 1000. After being directly connected with an external power supply, the linear motor 1000 can work without the need of arranging other peripheral configurations outside the linear motor 1000.

[0061] In one embodiment, referring to Figure 2 , Figure 5 and Figure 9, one end of the active screw 20 has a flange 21, the linear motor 1000 also includes a guide part 500 and an end bearing 600, the guide part 500 can be in the shape of a hollow sleeve or a nut, the guide part 500 is sleeved on one end of the active screw 20 close to the flange 21, the guide part 500 and the outer surface of the active screw 20 are clearance-matched so that the two can rotate relative to each other, one end of the second outer tube 300 is connected to the guide part 500, the end bearing 600 is located between the guide part 500 and the flange 21 and is connected to the guide part 500 and the flange 21, so that the active screw 20 and the guide part 500 can rotate relative to each other through the end bearing 600; wherein, the outer surface of the guide part 500 The outer surface of the guide portion 500 cooperates with the inner surface of the first outer tube 200, or the outer surface of the second outer tube 300 cooperates with the inner surface of the first outer tube 200, or the outer surface of the guide portion 500 and the outer surface of the second outer tube 300 both cooperate with the inner surface of the first outer tube 200 to limit the relative rotation of the guide portion 500 and the first outer tube 200, so that when the flange 21 and the active screw 20 rotate relative to the fixed screw 10 and make linear motion, the guide portion 500 can be driven to move linearly through the end bearing 600, and the guide portion 500 drives the second outer tube 300 to move linearly, so that the second outer tube 300 can only move linearly to achieve lifting; wherein, the outer surface of the guide portion 500 cooperates with the inner surface of the first outer tube 200, or the outer surface of the second outer tube 300 cooperates with the inner surface of the first outer tube 200, so as to limit the relative rotation of the guide portion 500 and the first outer tube 200, so that when the flange 21 and the active screw 20 rotate relative to the fixed screw 10 and make linear motion, the guide portion 500 can be driven to move linearly through the end bearing 600, and the guide portion 500 drives the second outer tube 300 to move linearly, so that the second outer tube 300 can only move linearly to achieve lifting; wherein, the outer surface of the guide portion 500 cooperates with the inner surface of the first outer tube 200, or the outer surface of the second outer tube 300 cooperates with the inner surface of the first outer tube 200, The inner surface of the outer tube 200 can be matched, and the outer surface shape of the guide portion 500 can be adapted to the inner surface shape of the first outer tube 200. For example, both are non-circular (for example, polygons such as quadrilaterals and pentagons. When they are quadrilaterals, the first outer tube 200 can be a square tube). Alternatively, the outer surface of the guide portion 500 can be provided with ridges, and the inner surface of the first outer tube 200 can be provided with grooves along its length that slide with the ridges on the guide portion 500. Alternatively, the outer surface of the guide portion 500 can be provided with grooves, and the inner surface of the first outer tube 200 can be provided with ridges along its length that slide with the grooves on the guide portion 500. For example, the inner surface of the first outer tube 200 has four corners. A convex strip is provided along its length direction; similarly, the outer surface of the second outer tube 300 is matched with the inner surface of the first outer tube 200. The outer surface shape of the second outer tube 300 can be adapted to the inner surface shape of the first outer tube 200. For example, both are non-circular (for example, polygons such as quadrilaterals and pentagons). Alternatively, the outer surface of the second outer tube 300 can be provided with a convex strip, and the inner surface of the first outer tube 200 can be provided with a sliding groove along its length direction that slidably cooperates with the convex strip on the second outer tube 300. Alternatively, the outer surface of the second outer tube 300 can be provided with a sliding groove, and the inner surface of the first outer tube 200 can be provided with a convex strip along its length direction that slidably cooperates with the sliding groove on the second outer tube 300.

[0062] It should be noted that the cooperation method between the second outer tube 300 and the active screw rod 20 is not limited to this. In some other embodiments, one end of the second outer tube 300 can be directly connected to the active screw rod 20 through a bearing, and one end of the second outer tube 300 can also be directly rotated with the active screw rod 20 without being rotated through an intermediate piece.

[0063] In one embodiment, the transmission device 100 further includes a screw nut 30, which is sleeved on the active screw 20. The inner surface of the screw nut 30 is provided with an internal thread, and the active screw 20 can drive the screw nut 30 to move along the axial direction of the active screw 20 through the second external thread 202; the third outer tube 400 can be connected to the screw nut 30 so as to be able to move along the axial direction of the active screw 20 with the screw nut 30, thereby being able to rise and fall relative to the second outer tube 300; wherein, the screw nut 30 is sleeved on the active screw 20, which means that the screw nut 30 It is directly sleeved on the active screw rod 20 or sleeved on the active screw rod 20 through an intermediate component; in one way, the screw nut 30 can be directly sleeved on the active screw rod 20 and threadedly matched with the second external thread 202. When the active screw rod 20 rotates, the screw nut 30 is directly driven to move linearly through the second external thread 202. In this case, the fixed screw rod 10 can be regarded as the first stage, the first outer tube 200 is the first stage lifting tube, the active screw rod 20 can be regarded as the second stage, the second outer tube 300 is the second stage lifting tube, and the screw nut 30 can be regarded as the third stage , the third outer tube 400 is the third-stage lifting tube, thereby realizing three-stage lifting; another way is that the screw nut 30 can also be sleeved on the active screw 20 through an intermediate component. When the active screw 20 rotates, the intermediate component is driven to move linearly through the second external thread 202, thereby indirectly driving the screw nut 30 to move linearly. For example, the intermediate component can be a hollow screw sleeved on the active screw 20, and the screw nut 30 can be threadedly matched with the hollow screw. In this case, the fixed screw 10 can be regarded as the first stage, and the first outer tube 200 is the first-stage lifting. Tube, the active screw rod 20 can be regarded as the second stage, the second outer tube 300 is the second stage lifting tube, the hollow screw rod can be regarded as the third stage, a hollow outer tube can be connected to the hollow screw rod as the third stage lifting tube, the screw nut 30 can be regarded as the fourth stage, the third outer tube 400 is the fourth stage lifting tube, thereby realizing four-stage lifting, and so on, the hollow screw rod and the hollow outer tube connected to the hollow screw rod can be set in multiples, and each hollow screw rod can be sequentially sleeved from the inside to the outside, and the screw nut 30 is threadedly matched with the outermost hollow screw rod, thereby realizing multi-stage lifting of more than four stages.

[0064] Alternatively, in one embodiment, see Figure 3 、 Figure 5 、 Figure 7 and Figure 9The screw nut 30 is threadedly matched with the second external thread 202 of the active screw 20, that is, the internal thread of the screw nut 30 is matched or screwed with the second external thread 202, and the active screw 20 is driven by the driving mechanism 40 to perform rotational motion and linear motion relative to the fixed screw 10, and the active screw 20 drives the second outer tube 300 to rise and fall relative to the first outer tube 200, and the active screw 20 drives the screw nut 30 to perform linear motion relative to the active screw 20, and the screw nut 30 drives the third outer tube 400 to rise and fall relative to the second outer tube 300, thereby realizing three-stage lifting with high stability, and the second outer tube 300 and the third outer tube 400 are lifted and lowered at the same time, which can improve the lifting efficiency; the outer surface of the screw nut 30 can be aligned with the inner surface of the second outer tube 300 The surfaces cooperate with each other to limit the relative rotation of the screw nut 30 and the second outer tube 300, and only relative linear motion can be performed. Of course, only the outer surface of the third outer tube 400 can cooperate with the inner surface of the second outer tube 300, or the outer surface of the screw nut 30 and the outer surface of the third outer tube 400 can cooperate with the inner surface of the second outer tube 300; wherein, the outer surface of the screw nut 30 cooperates with the inner surface of the second outer tube 300 in the manner of the outer surface of the guide portion 500 cooperating with the inner surface of the first outer tube 200 as described above, and the outer surface of the third outer tube 400 cooperates with the inner surface of the second outer tube 300 in the manner of the outer surface of the second outer tube 300 cooperating with the inner surface of the first outer tube 200 as described above.

[0065] Alternatively, in one embodiment, see Figure 2 and Figure 5 The transmission device 100 also includes a guide support portion 60, which is rotatably connected to one end of the active screw rod 20, and the guide support portion 60 and the active screw rod 20 can be clearance-matched. For example, the outer surface of one end of the active screw rod 20 is provided with a smooth section, and the guide support portion 60 is rotatably sleeved on the smooth section. Of course, the guide support portion 60 can also be rotatably connected to the active screw rod 20 through a bearing; the outer surface of the guide support portion 60 cooperates with the inner surface of the third outer tube 400 to limit the relative rotation of the guide support portion 60 and the third outer tube 400, wherein the outer surface of the guide support portion 60 cooperates with the inner surface of the third outer tube 400, and the outer surface of the guide portion 500 can adopt the above-mentioned method of cooperating with the inner surface of the first outer tube 200. In this arrangement, the guide support portion 60 can be supported between the active screw rod 20 and the third outer tube 400. The guide support portion 60 can only move linearly with the active screw rod 20 but not rotate with the active screw rod 20, thereby improving the stability of the relative movement between the active screw rod 20 and the third outer tube 400.

[0066] Alternatively, in one embodiment, see Figure 1 、 Figure 2 and Figure 5A first sealing member 210 is provided at the end of the first outer tube 200 away from the end where the first outer tube 200 is fixed to the fixed screw rod 10. The first sealing member 210 seals between the first outer tube 200 and the second outer tube 300, thereby improving the sealing performance, preventing the entry of external impurities, and playing a supporting role. A second sealing member 310 is provided at the end of the second outer tube 300 away from the end where the first outer tube 200 is fixed to the fixed screw rod 10. The second sealing member 310 seals between the second outer tube 300 and the third outer tube 400, thereby improving the sealing performance, preventing the entry of external impurities, and playing a supporting role.

[0067] Optionally, in one embodiment, the end of the third outer tube 400 is sealed with a connecting piece 430. Specifically, the connecting piece 430 is provided on the third outer tube 400 away from the end where the first outer tube 200 and the fixed screw rod 10 are fixed. The connecting piece 430 can seal the end of the third outer tube 400 to prevent external impurities such as dust from entering the interior of the third outer tube 400 and affecting the transmission coordination between the active screw rod 20 and the fixed screw rod 10, the transmission coordination between the active screw rod 20 and the third outer tube 400 or the external object. It can also be used to connect with external objects that need to be lifted and lowered, thereby playing a connecting role.

[0068] In another embodiment, the transmission device 100 also includes a plurality of screw layer assemblies, and the screw layer assemblies are sequentially assembled from the inside to the outside. The innermost screw layer assembly is mounted on the active screw 20, and the third outer tube can be connected to the outermost screw layer assembly. The active screw 20 can drive each screw layer assembly to rotate and move along the axial direction of the active screw 20, thereby realizing multi-stage lifting.

[0069] Optionally, in one embodiment, the screw layer assembly includes a hollow screw and a sleeve connected to the hollow screw, the interior of the hollow screw is hollow, the inner surface of the hollow screw is provided with a second internal thread, and the outer surface of the hollow screw is provided with a fourth external thread, and each hollow screw is sequentially sleeved from the inside to the outside, and the second internal thread of the outermost hollow screw of the two adjacent hollow screws is matched or screwed with the fourth external thread of the innermost hollow screw; in the two adjacent screw layer assemblies, the sleeve of the outermost screw layer assembly is sleeved into the sleeve of the innermost screw layer assembly; the innermost hollow screw is sleeved into the active screw 20, and the second internal thread of the innermost hollow screw is matched or screwed with the second external thread 202 of the active screw 20. By rotating the active screw 20, the hollow screws of each screw layer assembly are driven to move linearly and / or rotate through the second external thread 202, so that the sleeves of each screw layer assembly can be raised and lowered, thereby achieving multi-stage lifting. For those skilled in the art, parameters such as the lead angle of the second external thread 202 and the fourth external thread of each hollow screw can be set according to actual application needs. Furthermore, the screw nut 30 can be threadedly engaged with the fourth external thread of the hollow screw of the outermost screw layer assembly, and the third outer tube 400 can be connected to the screw nut 30. Of course, the sleeve of the outermost screw layer assembly can also be removed, and the third outer tube 400 can be connected to the hollow screw of the outermost screw layer assembly.

[0070] Alternatively, in one embodiment, the above-mentioned hollow screw can be replaced by a transmission screw and a nut fixedly connected to the transmission screw. The transmission screw and the nut can be coaxially arranged, the interior of the transmission screw is hollow, and the outer surface of the transmission screw is provided with a fifth external thread. The transmission screws of each screw layer assembly are sequentially sleeved from the inside to the outside, and the nut of the outermost screw layer assembly in the two adjacent screw layer assemblies is threadedly matched or screwed with the fifth external thread of the innermost screw layer assembly; the transmission screw of the innermost screw layer assembly is sleeved on the active screw 20, and the nut of the innermost screw layer assembly is matched or screwed with the second external thread 202 of the active screw 20. The active screw 20 rotates and the nuts and transmission screws of each screw layer assembly are driven to move linearly and / or rotate through the second external thread 202, thereby achieving multi-stage lifting or telescoping. For those skilled in the art, parameters such as the lead angle of the second external thread 202 and the internal thread of the nut of each screw layer assembly can be set according to actual application needs.

[0071] Optionally, in one embodiment, the screw layer assembly includes a driven screw, a transmission nut, a driven member and a lifting outer tube. The interior of the driven screw is hollow, and the inner surface of the driven screw is provided with a second limiting portion along the axial direction of the driven screw. The outer surface of the driven screw is provided with a third external thread. The transmission nut is rotatably connected to one end of the driven screw. Specifically, the transmission nut can be connected to one end of the driven screw through a bearing so that the driven screw and the transmission nut can rotate relative to each other. Of course, the transmission nut can also be directly rotatably matched with the driven screw without a bearing; the driven member has a second limiting matching portion, and the second limiting matching portion is slidably matched with the second limiting portion. Specifically, the second limiting portion can be along the driven screw. The cam is axially protruding on the inner surface of the driven screw, and the second limiting fitting portion can be a slide groove provided on the outer peripheral surface of the driven member. Of course, the second limiting portion can also be a slide groove concavely provided on the inner surface of the driven screw along the axial direction of the driven screw, and the second limiting fitting portion is a cam or protrusion convexly provided on the outer peripheral surface of the driven member. The driven member refers to an intermediate power transmission member that can transmit the rotational force of the active screw to the driven screw or transmit the rotational force of the driven screw to another driven screw. For example, the driven member can be a spline, a cylindrical, fan-shaped, strip-shaped driven member, or a driven member of other regular or irregular shapes. The function of the driven member is similar to that of the above-mentioned linkage member 42; the lifting outer tube is located at the second The interior of the outer tube 300 is sleeved on the driven screw, and the lifting outer tube is connected to the transmission nut so that it can move with the transmission nut; wherein, the driven screw of the innermost screw layer assembly is sleeved on the active screw 20, and the transmission nut thread of the innermost screw layer assembly is matched with the second external thread 202, and the driven part of the innermost screw layer assembly is fixed to the active screw 20, and the outer surface of the transmission nut of the innermost screw layer assembly is matched with the inner surface of the second outer tube 300 to limit the relative rotation between the transmission nut and the second outer tube 300. Of course, only the outer surface of the lifting outer tube can be matched with the inner surface of the second outer tube 300, or the outer surface of the transmission nut and the outer surface of the lifting outer tube can be matched with the second The inner surface of the outer tube 300 is matched, wherein the outer surface of the driving nut of the innermost screw layer assembly is matched with the inner surface of the second outer tube 300 in a manner that the outer surface of the guide portion 500 is matched with the inner surface of the first outer tube 200, and the outer surface of the lifting outer tube is matched with the inner surface of the second outer tube 300 in a manner that the outer surface of the second outer tube 300 is matched with the inner surface of the first outer tube 200; the screw nut 30 can be threadedly matched with the third outer thread of the driven screw of the outermost screw layer assembly. When the number of screw layer assemblies is one, the outermost screw layer assembly and the innermost screw layer assembly are the same screw layer assembly;The outer surface of the screw nut 30 can cooperate with the inner surface of the lifting outer tube of the outermost screw layer assembly to limit the relative rotation of the screw nut 30 and the lifting outer tube. Of course, only the outer surface of the third outer tube 400 can cooperate with the inner surface of the lifting outer tube of the outermost screw layer assembly, or the outer surface of the screw nut 30 and the outer surface of the third outer tube 400 can cooperate with the inner surface of the lifting outer tube of the outermost screw layer assembly, wherein the outer surface of the screw nut 30 cooperates with the inner surface of the lifting outer tube of the outermost screw layer assembly The aforementioned method can be adopted in which the outer surface of the guide portion 500 cooperates with the inner surface of the first outer tube 200, the outer surface of the third outer tube 400 cooperates with the inner surface of the lifting outer tube of the outermost screw layer assembly, and the aforementioned method in which the outer surface of the second outer tube 300 cooperates with the inner surface of the first outer tube 200 can be adopted; the active screw 20 can drive each screw layer assembly to rotate and move along the axial direction of the active screw 20, thereby causing the lifting outer tubes of each screw layer assembly to rise and fall simultaneously, thereby achieving four or more levels of multi-stage lifting.

[0072] Specifically, when the number of screw layer assemblies is one, the driving mechanism 40 drives the active screw 20 to perform rotational motion and linear motion, and the active screw 20 drives the second outer tube 300 to rise and fall relative to the first outer tube 200. When the active screw 20 performs rotational motion, the driven screw is driven to rotate through the follower, and at the same time, the transmission nut of the screw layer assembly is driven to perform linear motion relative to the active screw 20 through the second external thread 202, so that the driven screw performs linear motion and rotational motion at the same time, and the transmission nut drives the lifting outer tube to rise and fall relative to the second outer tube 300. When the driven screw performs rotational motion, it can drive the screw through its third external thread The rod nut 30 moves linearly, and the screw nut 30 drives the third outer tube 400 to rise and fall relative to the lifting outer tube. In this case, the fixed screw 10 can be regarded as the first stage, the first outer tube 200 is the first-stage lifting tube, the active screw 20 can be regarded as the second stage, the second outer tube 300 is the second-stage lifting tube, the driven screw can be regarded as the third stage, the lifting outer tube is the third-stage lifting tube, the screw nut 30 can be regarded as the fourth stage, and the third outer tube 400 is the fourth-stage lifting tube, thereby realizing four-stage lifting, and the second outer tube 300, the lifting outer tube and the third outer tube 400 are lifted and lowered at the same time, which can effectively improve the lifting efficiency.

[0073] Specifically, when the number of screw layer assemblies is two or more, the innermost screw layer assembly is sleeved on the active screw 20, the driven screw of the second inner screw layer assembly is sleeved on the driven screw of the innermost screw layer assembly, the transmission nut thread of the second inner screw layer assembly is matched with the third external thread of the driven screw of the innermost screw layer assembly, the driven part of the second inner screw layer assembly is fixed to the driven screw of the innermost screw layer assembly, the outer surface of the transmission nut of the second inner screw layer assembly and / or the screw of the second inner layer The outer surface of the lifting outer tube of the layer assembly cooperates with the inner surface of the lifting outer tube of the innermost screw layer assembly to limit the relative rotation of the transmission nut of the second inner screw layer assembly and the lifting outer tube of the innermost screw layer assembly. Similarly, each screw layer assembly is sequentially assembled from the inside to the outside. The active screw rod 20 can be used to drive each screw layer assembly to rotate and move along the axial direction of the active screw rod 20, and the lifting outer tubes of each screw layer assembly can be lifted and lowered at the same time, which can achieve multi-stage lifting of five or more levels.

[0074] The present application also provides an embodiment of a device using a linear motor. The device using a linear motor includes the linear motor 1000 of any of the above-described embodiments. The linear motor is used to provide lifting and lowering. The device using a linear motor is a device that requires a lifting function, such as, but not limited to, a lifter, a lifting platform, or a lifting table. Because the device using a linear motor provided in the embodiment of the present application utilizes the linear motor 1000 of the above-described embodiment, it also has the technical effects provided by the technical solution of the linear motor 1000, which will not be further elaborated here.

[0075] 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 scope of protection of the present invention.

Claims

1. A linear motor, characterized in that: The linear motor comprises: A transmission device, comprising: A fixed screw rod, wherein the outer surface of the fixed screw rod is provided with a first external thread; An active screw rod, wherein the interior of the active screw rod is hollow, the inner surface of the active screw rod is provided with a first internal thread, the active screw rod is sleeved on the fixed screw rod, and the first internal thread matches the first external thread; the outer surface of the active screw rod is provided with a second external thread; and a driving mechanism, wherein a power output end of the driving mechanism is connected to the active screw and is used to drive the active screw to rotate relative to the fixed screw; a first outer tube, the first outer tube being sleeved on the fixed screw rod; a second outer tube, the second outer tube being located inside the first outer tube and sleeved on the active screw rod, the second outer tube being connected to the active screw rod so as to be movable along with the active screw rod; and A third outer tube is located inside the second outer tube and is connected to the second outer thread of the active screw rod so as to be movable along the axial direction of the active screw rod.

2. The linear motor according to claim 1, wherein: The driving mechanism is arranged on the fixed screw rod; And / or, the interior of the fixed screw is hollow, the driving mechanism is arranged inside the fixed screw, and the power output end of the driving mechanism extends to the outside of the fixed screw and is connected to the active screw.

3. The linear motor according to claim 1, wherein: The rotation direction of the second external thread is opposite to that of the first external thread; And / or, the first internal thread is provided on a portion of the inner surface of the active screw rod close to the end portion of the active screw rod.

4. The linear motor according to claim 1, wherein: The interior of the fixed screw rod is hollow, and the linear motor further comprises: A mounting cylinder, the mounting cylinder being disposed inside the fixed screw rod; and a control panel, the control panel being disposed inside the mounting tube and electrically connected to the driving mechanism for controlling the driving mechanism; Wherein, the installation tube includes: Cylinder body; a first supporting portion connected to one end of the cylindrical portion; and a second supporting portion connected to the other end of the cylindrical portion; The control panel is located inside the cylindrical portion, and two ends of the control panel are connected to the first supporting portion and the second supporting portion respectively; In which, the inner surface of the fixed screw is provided with a third limiting portion along the axial direction of the fixed screw, the outer surface of the first support portion is provided with a third limiting matching portion adapted to the third limiting portion, and / or the outer surface of the second support portion is provided with a fourth limiting matching portion adapted to the third limiting portion.

5. The linear motor according to any one of claims 1 to 4, characterized in that: The inner surface of the active screw is provided with a first limiting portion along the axial direction of the active screw, and the driving mechanism includes: a power unit, the power unit being fixed to the fixed screw rod and having a power output shaft; and A linkage member, the linkage member is fixed to the power output shaft and is located inside the active screw rod, the linkage member has a first position-limiting fitting portion, and the first position-limiting fitting portion is slidably fitted with the first position-limiting portion; Wherein, the power unit is a first motor; or, the power unit includes: a second motor, the second motor being fixed to the fixed screw; and A first gearbox is connected to the output shaft of the second motor, and the first gearbox has the power output shaft.

6. The linear motor according to any one of claims 1 to 4, characterized in that: The linear motor further includes a power supply assembly, which is disposed inside the first outer tube and is electrically connected to the driving mechanism; And / or, the end of the third outer tube is sealed with a connector; And / or, the transmission device further includes a fixing portion, one end of the fixing screw is fixed to the fixing portion, and one end of the first outer tube is fixed to the fixing portion; the fixing portion has a groove, and one end of the fixing screw is inserted into the groove.

7. The linear motor according to any one of claims 1 to 4, characterized in that: One end of the second outer tube is connected to the active screw through a bearing; or one end of the active screw has a flange, and the linear motor further includes: a guide portion, the guide portion being sleeved on the active screw rod, and one end of the second outer tube being connected to the guide portion; and an end bearing, the end bearing being located between the guide portion and the flange and connected to the guide portion and the flange; The outer surface of the guide portion and / or the second outer tube cooperates with the inner surface of the first outer tube to limit relative rotation between the guide portion and the first outer tube.

8. The linear motor according to any one of claims 1 to 4, characterized in that: The transmission device also includes a plurality of screw layer assemblies, each of which is assembled in sequence from the inside to the outside, and the innermost screw layer assembly is sleeved on the active screw; the third outer tube is connected to the outermost screw layer assembly; the active screw can drive each of the screw layer assemblies to rotate and move along the axial direction of the active screw.

9. The linear motor according to any one of claims 1 to 4, characterized in that: The transmission device also includes a guide support portion, which is rotatably connected to one end of the active screw rod. The outer surface of the guide support portion cooperates with the inner surface of the third outer tube to limit the relative rotation of the guide support portion and the third outer tube.

10. A device using a linear motor, characterized in that: Comprising the linear motor according to any one of claims 1 to 9.

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