CN215835254U

CN215835254U - Linear motor and lifting device using same

Info

Publication number: CN215835254U
Application number: CN202121189589.6U
Authority: CN
Inventors: 王俊恒; 南奋勇; 李平; 郭阳利
Original assignee: Shenzhen Zhaowei Machinery and Electronics Co Ltd
Current assignee: Shenzhen Zhaowei Machinery and Electronics Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2022-02-15
Anticipated expiration: 2031-05-28

Abstract

The utility model relates to the technical field of lifting, and provides a linear motor and a lifting device using the same, wherein the linear motor comprises: a transmission, comprising: the outer surface of the fixed screw rod is provided with a first external thread; the driving screw rod is hollow, a first internal thread is arranged on the inner surface of the driving screw rod, the driving screw rod is sleeved on the fixed screw rod, and the first internal thread is matched with the first external thread; the outer surface of the driving screw rod is provided with a second external thread; the power output end of the driving mechanism is connected with the driving screw rod; the first outer pipe is sleeved on the fixed screw rod; the second outer pipe is positioned in the first outer pipe, sleeved on the active screw rod and connected to the active screw rod; and a third outer tube positioned inside the second outer tube and connected to the second outer thread of the driving screw. The linear motor provided by the utility model can effectively improve the lifting efficiency of the linear motor and has small occupied space.

Description

Linear motor and lifting device using same

Technical Field

The utility model relates to the technical field of lifting, in particular to a linear motor and a lifting device using the same.

Background

The linear motor is usually used in a screw rod and nut matching manner to drive the lifting of components such as the outer tube, and is often applied to devices such as lifting tables, lifting chairs, lifting platforms, lifting equipment and the like which need to realize a lifting function.

Current linear electric motor sets up multistage outer tube in order to realize multistage lift usually, but linear electric motor's transmission is transmission in proper order for parts such as outer tube go up and down in proper order step by step usually for it is inefficient to lead to going up and down.

SUMMERY OF THE UTILITY MODEL

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

In order to achieve the purpose, the utility model adopts the technical scheme that: provided is a linear motor including: a transmission, the transmission comprising: the outer surface of the fixed screw rod is provided with a first external thread; the driving screw rod is hollow, a first internal thread is arranged on the inner surface of the driving screw rod, the driving screw rod is sleeved on the fixed screw rod, and the first internal thread is matched with the first external thread; the outer surface of the driving screw rod is provided with a second external thread; the power output end of the driving mechanism is connected with the driving screw rod and is used for driving the driving screw rod to rotate relative to the fixed screw rod; the first outer pipe is sleeved on the fixing screw rod; the second outer pipe is positioned in the first outer pipe and sleeved on the active screw rod, and the second outer pipe is connected to the active screw rod so as to be capable of moving along with the active screw rod; and the third outer pipe is positioned inside the second outer pipe and connected to the second external thread of the driving screw rod so as to be capable of moving along the axial direction of the driving screw rod.

In one embodiment, the drive mechanism is disposed on the stationary screw; and/or the inside of the fixed screw rod is hollow, the driving mechanism is arranged inside the fixed screw rod, and the power output end of the driving mechanism extends to the outside of the fixed screw rod and is connected with the active screw rod.

In one embodiment, the second external thread has a direction of rotation opposite to the direction of rotation of the first external thread; and/or the first internal thread is arranged on the inner surface of the driving screw rod close to the end part of the driving screw rod.

In one embodiment, the fixing screw has a hollow inside, and the linear motor further includes: the mounting cylinder is arranged inside the fixed screw rod; and the control panel is arranged in the mounting cylinder and electrically connected with the driving mechanism for controlling the driving mechanism.

In one embodiment, the mounting cartridge comprises: a barrel portion; a first support part connected to one end of the barrel part; and a second supporting portion connected to the other end of the barrel portion; wherein, the control panel is located the inside of barrel portion, and, the both ends of control panel are connected respectively in first supporting part and second supporting part.

In one embodiment, the inner surface of the fixing screw rod is provided with a third limiting part along the axial direction of the fixing screw rod, the outer surface of the first supporting part is provided with a third limiting matching part matched with the third limiting part, and/or the outer surface of the second supporting part is provided with a fourth limiting matching part matched with the third limiting part.

In one embodiment, the inner surface of the driving screw rod is provided with a first limiting part along the axial direction of the driving screw rod, and the driving mechanism comprises: the power part is fixed on the fixed screw rod and is provided with a power output shaft; and the linkage piece is fixed on the power output shaft and is positioned in the driving screw rod, and the linkage piece is provided with a first limiting matching part which is in sliding fit with the first limiting part.

In one embodiment, the power section is a first motor; or, the power part includes: the second motor is fixed on the fixed screw rod; and the first gear box is connected with an output shaft of the second motor and is provided with a power output shaft.

In one embodiment, the linear motor further comprises a power supply assembly, the power supply assembly is arranged inside the first outer tube, and the power supply assembly is electrically connected with the driving mechanism; and/or the end part of the third outer pipe is sealed with a connecting piece; and/or the transmission device further comprises a fixing part, one end of the fixing screw rod is fixed on the fixing part, and one end of the first outer tube is fixed on the fixing part; the fixing part is provided with a groove, and one end of the fixing screw rod is inserted into the groove.

In one embodiment, one end of the second outer pipe is connected with the driving screw rod through a bearing; or, the one end of initiative lead screw has the flange, and linear electric motor still includes: the guide part is sleeved on the driving screw rod, and one end of the second outer pipe is connected to the guide part; and an end face bearing located between and connected to the guide and the flange; the outer surface of the guide part and/or the second outer pipe is matched with the inner surface of the first outer pipe so as to limit the relative rotation of the guide part and the first outer pipe.

In one embodiment, the transmission device further comprises a plurality of screw rod layer assemblies, each screw rod layer assembly is sequentially sleeved and assembled from inside to outside, and the screw rod layer assembly at the innermost layer is sleeved on the active screw rod; the third outer pipe is connected with the outermost screw rod layer assembly; the driving screw rod can drive each screw rod layer assembly to rotate and move along the axial direction of the driving screw rod.

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

Another object of the present invention is to provide a lifting device using a linear motor, which includes the linear motor of any one of the above embodiments.

One or more technical solutions described above in the embodiments of the present invention have at least the following technical effects or advantages:

the linear motor provided by the embodiment of the utility model is provided with a transmission device, a first outer pipe, a second outer pipe and a third outer pipe, wherein the transmission device comprises a fixed screw rod, a driving screw rod which is hollow inside and sleeved on the fixed screw rod, and a driving mechanism of which the power output end is connected with the driving screw rod, the outer surface of the fixed screw rod is provided with a first external thread, the inner surface of the driving screw rod is provided with a first internal thread matched with the first external thread, the outer surface of the driving screw rod is provided with a second external thread, the third outer pipe, the second outer pipe and the first outer pipe are sequentially sleeved from inside to outside, the second outer pipe is connected with the driving screw rod, the third outer pipe is connected with the second external thread of the driving screw rod, the driving screw rod is driven by the driving mechanism to rotate relative to the fixed screw rod, so that the driving screw rod can simultaneously make linear motion along the axial direction of the fixed screw rod under the matching of the first internal thread and the first external thread, the driving screw rod drives the second outer pipe to lift relative to the first outer pipe, meanwhile, the rotation of the driving screw rod can drive the third outer pipe to do linear motion along the axial direction of the driving screw rod through the second outer threads, so that the third outer pipe moves axially relative to the driving screw rod along with the axial movement of the driving screw rod relative to the fixed screw rod, and the third outer pipe lifts relative to the second outer pipe, thereby realizing the simultaneous lifting of the second outer pipe and the third outer pipe, and effectively improving the lifting efficiency of the linear motor; and the inner surface of the driving screw rod is directly provided with a first internal thread, and the thread is matched with the first external thread of the fixed screw rod so as to rotate and linearly move relative to the fixed screw rod, so that the transmission device occupies a small space of the linear motor, and the reduction of the volume of the linear motor is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a linear motor provided by the present invention;

fig. 2 is an exploded view of a linear motor according to the present invention;

FIG. 3 is an exploded view of the transmission of the present invention;

fig. 4 is a schematic top view of the linear motor according to the present invention;

FIG. 5 is a schematic cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a schematic view of the structure of the present invention for the engagement of the stationary lead screw with the driving mechanism;

FIG. 7 is a schematic view of the structure of the active lead screw and the lead screw nut provided by the present invention;

FIG. 8 is a schematic structural diagram of the active lead screw and the lead screw nut in a front view;

fig. 9 is a schematic sectional view in the direction B-B in fig. 8.

Wherein, in the figures, the respective reference numerals:

1000. a linear motor; 100. a transmission device; 200. a first outer tube; 210. a first seal member; 300. a second outer tube; 310. a second seal member; 400. a third outer tube; 430. a connecting member; 500. a guide portion; 600. An end face bearing; 700. mounting the cylinder; 710. a barrel portion; 720. a first support section; 7201. a third limit matching part; 7301. a fourth limit matching part; 730. a second support portion; 800. a control panel; 900. a power supply component; 10. fixing the screw rod; 101. a first external thread; 102. a third limiting part; 20. an active screw rod; 110. a support plate; 21. a flange; 201. a first internal thread; 202. a second external thread; 30. a feed screw nut; 40. a drive mechanism; 203. a first limiting part; 41. a power section; 410. a power take-off shaft; 42. a linkage member; 420. a first limit matching part; 411. a second motor; 412. a first gear case; 50. a fixed part; 51. a groove; 60. a guide support.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1, 2, 5 and 9, an embodiment of the present invention provides a linear motor 1000, which can be applied to devices that need to implement a lifting function, such as a lifter, a lifting table, etc., 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, wherein the transmission device 100 is used for lifting transmission to drive the second outer tube 300 and the third outer tube 400 to lift simultaneously, the transmission device 100 includes a fixing screw 10, a driving screw 20, and a driving mechanism 40, wherein:

the fixed screw rod 10 can be fixedly arranged, namely, does not do rotary motion or does not do linear motion, and 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 fixing screw 10, and may be fixed to one end of the fixing screw 10, or may be connected to other components without being fixedly connected to the fixing screw 10, the first outer tube 200 is tubular and hollow, and the first outer tube 200 is located at the outermost layer of the linear motor 1000, and may be regarded as a housing of the linear motor 1000.

The driving screw 20 is hollow, the inner surface of the driving screw 20 is provided with a first internal thread 201, the first internal thread 201 may be completely arranged on the inner surface of the driving screw 20 along the axial direction of the driving screw 20 (i.e., the axial direction of the driving screw 20), or the first internal thread 201 may be arranged on only a certain part of the inner surface of the driving screw 20, wherein the first internal thread 201 may be directly formed on the inner surface of the driving screw 20, that is, the first internal thread 201 and the driving screw 20 are integrally formed; the driving screw rod 20 is sleeved on the fixed screw rod 10, and the first internal thread 201 is matched with or screwed with the first external thread 101, so that the driving screw rod 20 can make linear motion relative to the fixed screw rod 10 through the screwing of the first internal thread 201 and the first external thread 101 when making rotary 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 for being in threaded fit with an external object to drive the external object to move, wherein the external object can be a screw rod nut, a hollow screw rod or other parts needing to be driven; the second outer tube 300 is tubular and hollow, the second outer tube 300 is located inside the first outer tube 200 and sleeved on the driving screw rod 20, and the second outer tube 300 is connected to the driving screw rod 20 to move along with the driving screw rod 20, when the driving screw rod 20 moves linearly relative to the fixing screw rod 10, the second outer tube 300 can move linearly along with the driving screw rod 20, so as to be lifted 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 outer thread 202 of the driving screw 20 to be capable of being driven by the second outer thread 202 to move in the axial direction of the driving screw 20 so as to be liftable with respect to the second outer tube 300, and the third outer tube 400 may be connected to the second outer thread 202 by an external object (e.g., a screw nut, a screw layer assembly, etc.) as an intermediate member, or may be directly threadedly connected to the second outer thread 202 of the driving screw 20.

The power output end of the driving mechanism 40 is connected with the driving screw rod 20 and is used for driving the driving screw rod 20 to rotate relative to the fixed screw rod 10; the driving mechanism 40 is a mechanism or a device capable of providing a driving force and driving the driving 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 an output end of the motor, and the driving force is provided by the motor, so that the transmission member drives the driving screw 20 to rotate relative to the fixed screw 10.

The linear motor 1000 provided by the embodiment of the application, by providing the transmission device 100, the first outer tube 200, the second outer tube 300, and the third outer tube 400, and providing the transmission device 100 including the fixing screw 10, the driving screw 20 which is hollow inside and sleeved on the fixing screw 10, and the driving mechanism 40 whose power output end is connected with the driving screw 20, and the outer surface of the fixing screw 10 is provided with the first external thread 101, the inner surface of the driving screw 20 is provided with the first internal thread 201 matched with the first external thread 101, the outer surface of the driving screw 20 is provided with the second external thread 202, the third outer tube 400, the second outer tube 300, and the first outer tube 200 are sequentially sleeved from inside to outside, and the first outer tube 200 is fixed on the fixing screw 10, the second outer tube 300 is connected to the driving screw 20, the third outer tube 400 is connected to the second external thread 202 of the driving screw 20, the driving screw 20 is driven by the driving mechanism 40 to rotate relative to the fixing screw 10, under the matching of the first internal thread 201 and the first external thread 101, the driving screw 20 can make a rotational motion and simultaneously make a linear motion along the axial direction of the fixing screw 10 (i.e. the axial direction of the fixing screw 10), so as to realize the lifting of the driving screw 20, the driving screw 20 drives the second outer tube 300 to lift relative to the first outer tube 200, and at the same time, the rotation of the driving screw 20 can drive the third outer tube 400 to make a linear motion along the axial direction of the driving screw 20 through the second external thread 202, so that the third outer tube 400 can make an axial motion relative to the driving screw 20 while making an axial motion along with the driving screw 20 relative to the fixing screw 10, i.e. while the driving screw 20 moves relative to the fixing screw 10, the third outer tube 400 and an external object whose threads are matched with the second external threads 202 move relative to the driving screw 20, the third outer tube 400 and an external object whose threads are matched with the second external threads 202 can quickly lift, the third outer tube 400 is lifted relative to the second outer tube 300, so that the second outer tube 300 and the third outer tube 400 are lifted simultaneously, and the lifting efficiency of the linear motor 1000 can be effectively improved. And, first internal thread 201 sets up directly in the internal surface of initiative lead screw 20, can improve the steadiness and the removal uniformity between first internal thread 201 and the initiative lead screw 20, can prevent to produce relative motion between initiative lead screw 20 and the first internal thread 201, thereby improve cooperation steadiness and transmission uniformity between initiative lead screw 20 and the fixed screw 10, simultaneously, need not to connect in addition on initiative lead screw 20 with the nut of fixed screw 10 screw-thread fit, can effectively simplify the structure, reduce the space, make transmission 100 occupy linear electric motor 1000's space little, thereby do benefit to and reduce linear electric motor 1000's volume.

In one embodiment, referring to fig. 2 and 3, the transmission device 100 further includes a fixing portion 50, the same end of the fixing screw 10 and the same end of the first outer tube 200 can be fixed to the fixing portion 50, the first outer tube 200 is fixed to the fixing screw 10 through the fixing portion 50, of course, only the fixing screw 10 can be fixed to the fixing portion 50, and the first outer tube 200 is not fixed to the fixing portion 50; the fixing portion 50 may be a base, the fixing screw 10 and the first outer tube 200 may be vertically fixed to the fixing portion 50, the fixing portion 50 may also be a base, the fixing screw 10 and the first outer tube 200 may be transversely fixed to the fixing portion 50, and of course, the fixing portion 50 may also be of other structures. So set up, the fixed part 50 can fixed connection lead screw 10 and first outer tube 200, prevents that lead screw 10 and first outer tube 200 from removing, reinforcing stability.

It should be noted that, in some other embodiments, the transmission device 100 may not be provided with the fixing portion 50, and the fixing screw 10 may be directly fixed to the linear motor 1000, for example, the fixing screw 10 may be directly fixed to the housing (i.e., the first outer tube 200) of the linear motor 1000.

Alternatively, in an embodiment, referring to fig. 3, the fixing portion 50 has a groove 51, and one end of the fixing screw 10 is inserted into the groove 51. With such an arrangement, the groove 51 is matched with the fixing screw rod 10, so that the fixing screw rod 10 can be prevented from deflecting or moving relative to the fixing portion 50, and the stability of the fixing screw rod 10 is improved.

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 a screw, a bolt, a rivet, a welding, or the like.

Alternatively, in one embodiment, referring to fig. 5 and 6, the fixing screw 10 is detachably fixed to the fixing portion 50, for example, the fixing screw 10 may be fixed to the fixing portion 50 by a screw or a bolt. So configured, the detachment and installation between the fixing screw 10 and the fixing portion 50 is facilitated.

Alternatively, in an embodiment, referring to fig. 3, 5 and 6, the linear motor 1000 further includes a support plate 110, the support plate 110 is supported between the fixing screw 10 and the first outer tube 200, so as to improve stability, and the support plate 110 may be located on a portion of the fixing screw 10 close to the fixing portion 50.

In one embodiment, referring to fig. 3 and 5, the rotation direction of the second external thread 202 is opposite to that of the first external thread 101, so that the moving direction of the external object screwed to the second external thread 202 and/or the third external pipe 400 during linear motion is the same as that of the driving screw rod 20, thereby achieving that the external object screwed to the second external thread 202 and/or the third external pipe 400 is lifted and lowered simultaneously with the driving screw rod 20 in the same direction; the direction of rotation is the direction of the screw thread, and the screw thread that is rotated clockwise is called a right-hand screw thread, and the screw thread that is rotated counterclockwise is called a left-hand screw thread.

In one embodiment, referring to fig. 5 and 9, the first internal thread 201 is disposed on a portion of the inner surface of the driving screw 20 near the end of the driving screw 20, and for the orientation shown in fig. 9, the first internal thread 201 is disposed on a portion of the inner surface of the driving screw 20 near the lower end of the driving screw 20, and a gap may be formed between a portion of the inner surface of the driving screw 20 where the first internal thread 201 is not disposed and the first external thread 101 of the fixing screw 10. So set up, only in the initiative lead screw 20 internal surface processing that is close to the tip position of initiative lead screw 20 first internal thread 201 can, and need not all to process the internal thread at the internal surface of initiative lead screw 20, can effectively reduce cost, raise the efficiency, if to the internal surface processing full thread of initiative lead screw 20 then the technology is complicated and the cost is higher.

In the linear motor in the prior art, a motor and a plurality of screw rods sequentially sleeved are adopted to realize transmission, wherein the screw rod at the innermost layer is a solid screw rod and is connected with the output end of the motor, the screw rod at the innermost layer is driven by the motor to rotate, and then the screw rod at the innermost layer drives the screw rod sleeved outside the screw rod to move so as to realize multi-stage lifting. However, the lifting efficiency is low, the motor and the transmission mechanism connected between the motor and the innermost lead screw are usually arranged at the end of the linear motor in a protruding mode, namely the motor is exposed outside the linear motor, the occupied space is large, the use and installation of the linear motor on a device using the linear motor are affected, the linear motor is not attractive, and the user experience is affected.

To solve the above problem, in one embodiment, referring to fig. 5, the driving mechanism 40 is disposed on the fixing screw 10, specifically, the driving mechanism 40 may be disposed outside the fixing screw 10 and inside the driving screw 20, or the fixing screw 10 may be disposed with a hollow interior and the driving mechanism 40 may be disposed inside the fixing screw 10. So set up, because the fixed setting of stationary screw 10, set up actuating mechanism 40 on stationary screw 10, not only do benefit to actuating mechanism 40's fixed mounting, and actuating mechanism 40 does not directly expose in linear electric motor 1000's outside and hide in linear electric motor 1000's inside promptly, not only be difficult for receiving external influence, and do benefit to the make full use of space, it is compacter to make the installation between the part, and make linear electric motor 1000's tip do not have because of parts such as motor convex part, more elegant appearance, do benefit to linear electric motor 1000's use installation, can improve user experience and feel.

Alternatively, in an embodiment, referring to fig. 3, 5 and 6, the fixing screw 10 is hollow, the driving mechanism 40 is disposed inside the fixing screw 10, and the power output end of the driving mechanism 40 extends to the outside of the fixing screw 10 to be connected with the driving screw 20, wherein the driving mechanism 40 may be partially disposed inside the fixing screw 10, or all of the driving mechanism 40 except the power output end of the driving mechanism 40 may be disposed inside the fixing screw 10. With such an arrangement, the driving mechanism 40 is arranged inside the fixed screw rod 10, so that the arrangement stability and the arrangement convenience of the driving mechanism 40 can be improved, a hidden type installation is formed, the overall length of the transmission device 100 during contraction can be properly reduced, additional installation design consideration is not required because the driving mechanism 40 is arranged outside the fixed screw rod 10 and is positioned inside the active screw rod, the distance between the end parts of the fixed screw rod 10 and the active screw rod 20 close to the same end of the driving mechanism 40 is relatively short, and the length of the linear motor 1000 after complete contraction is favorably shortened; in addition, the external space is not occupied, the space utilization rate can be improved, the matching distance between the power output end of the driving mechanism 40 and the driving screw rod 20 is short, the driving screw rod 20 is driven to rotate relative to the fixed screw rod 10, the connecting matching length between the driving mechanism 40 and the driving screw rod 20 can be shortened, and the transmission stability is improved.

Alternatively, in an embodiment, referring to fig. 3 and fig. 5 to 7, the inner surface of the driving screw 20 is provided with a plurality of first limiting portions 203 along the axial direction of the driving screw 20, the driving mechanism 40 includes a power portion 41 and a linking member 42, the power portion 41 is fixed to the fixed screw 10, specifically, the power portion 41 may be fixed to the inside of the fixed screw 10, for example, the power portion 41 may be fixed to the inside of the fixed screw 10 by clamping, welding, screwing or bolting, but is not limited thereto, the power portion 41 may be partially or completely located inside the fixed screw 10, the power portion 41 is located at an end of the fixed screw 10 away from the fixing portion 50, the power portion 41 is a device capable of providing a rotational driving force, the power portion 41 has a power output shaft 410, the power output shaft 410 extends to the outside of the fixed screw 10, the linking member 42 is fixed to the power output shaft 410 and is located inside the driving screw 20, the linkage member 42 has a plurality of first limit matching parts 420, the first limit matching parts 420 are in sliding fit with the first limit parts 203, and can limit the relative rotation of the linkage member 42 and the driving screw rod 20 and only can do relative linear motion; the linkage 42 is an intermediate power transmission member capable of transmitting the rotation power of the power output shaft 410 to the driving screw 20, for example, the linkage 42 may be a spline, a cylindrical linkage, a fan-shaped linkage, a strip-shaped linkage, or other regular or irregular linkage; specifically, the first limiting portion 203 may be a protruding strip protruding from the inner surface of the driving lead screw 20 along the axial direction of the driving lead screw 20, the first limiting engaging portion 420 may be a sliding slot disposed on the outer peripheral surface of the linking member 42, or of course, the first limiting portion 203 may be a sliding slot recessed from the inner surface of the driving lead screw 20 along the axial direction of the driving lead screw 20, and the first limiting engaging portion 420 is a protruding strip or protrusion protruding from the outer peripheral surface of the linking member 42, and the sliding slot and the protruding strip or protrusion are slidably engaged with each other, so that the relative rotation between the linking member 42 and the driving lead screw 20 can be limited, the driving lead screw 20 can be driven to rotate when the linking member 42 rotates, and the driving lead screw 20 and the linking member 42 can perform a relative linear motion when performing a linear motion relative to the fixed lead screw 10; the first position-limiting portion 203 may also be a polygonal inner surface of the driving screw 20, for example, a polygonal inner surface with a quadrangular cross section, and correspondingly, the first position-limiting engaging portion 420 may be a polygonal outer peripheral surface, for example, a polygonal outer peripheral surface with a quadrangular cross section, and at this time, the shape of the link 42 may be a polygonal link, and the relative rotation between the link 42 and the driving screw 20 can be limited by the sliding engagement of the first position-limiting engaging portion 420 of the link 42, which is a polygonal outer peripheral surface, with the first position-limiting portion 203 of the driving screw 20, which is a polygonal inner surface. During operation, the power output shaft 410 drives the linkage member 42 to rotate through the action of the power portion 41, the linkage member 42 drives the driving screw rod 20 to rotate through the cooperation of the first limiting portion 203 and the first limiting matching portion 420, the driving screw rod 20 makes linear motion relative to the fixed screw rod 10 under the cooperation of the first internal thread 201 and the first external thread 101, the driving screw rod 20 and the linkage member 42 make linear motion relatively, and meanwhile, the linkage member 42 can play a role in supporting and stabilizing the driving screw rod 20. So set up, do benefit to actuating mechanism 40 and stably drive initiative lead screw 20 and do rotary motion and linear motion simultaneously for stationary screw 10 for cooperation compact structure, stability is high between stationary screw 10, actuating mechanism 40 and the initiative lead screw 20.

Alternatively, in an embodiment, please refer to fig. 3 and 5, the power part 41 includes a second motor 411 and a first gear box 412, the second motor 411 is fixed to the fixed screw 10, an input end of the first gear box 412 is connected to an output shaft of the second motor 411, the first gear box 412 has a power output shaft 410, specifically, both the second motor 411 and the first gear box 412 may be fixed inside the fixed screw 10, only a part or all of the second motor 411 may be fixed inside the fixed screw 10 while the first gear box 412 is located outside the fixed screw 10, of course, both the second motor 411 and the first gear box 412 may be located outside the fixed screw 10 and inside the driving screw 20; it is understood that the first gearbox 412 may be any one of the existing gearboxes, such as, but not limited to, a planetary gearbox; in operation, the power unit 41 operates, and the power of the power unit 41 is transmitted from the output shaft thereof to the first gear case 412, transmitted from the gear train inside the first gear case 412 to the power output shaft 410, and transmitted to the link 42.

It should be noted that the structure of the power portion 41 is not limited to this, and in some other embodiments, the power portion 41 may be a first motor, the first motor has a power output shaft, and the link 42 is fixed to the power output shaft of the first motor, that is, the power portion 41 may not have the first gear box 412 and the link 42 is driven to rotate by the first motor, for example, the first motor may be a speed reduction motor, and the speed reduction motor has a power output shaft.

It should be further noted that the driving mechanism 40 may not have the linkage member 42, alternatively, in some other embodiments, the driving mechanism 40 includes a third motor and a second gear box, the third motor is fixed to the fixed screw rod, specifically, the third motor may be partially or completely located inside the fixed screw rod 10, the second gear box is connected to an output shaft of the third motor, the second gear box has a power output end which is matched with an inner surface of the driving screw rod 20 to drive the driving screw rod 20 to rotate relative to the fixed screw rod 10, wherein the power output end of the second gear box may be a rotatable outer shell of the second gear box, the inner surface of the outer shell may be provided with internal teeth engaged with internal transmission gears of the second gear box, the second gear box is driven by the third motor to operate, the outer shell of the second gear box is driven to rotate by the internal transmission gears of the second gear box, thereby enabling the second gearbox to drive the driving screw rod 20 to rotate; it will be appreciated that the second gearbox may be any of the prior art planetary gearboxes or a planetary gearbox modified from the prior art planetary gearboxes having a rotatable outer housing. Specifically, the inner surface of the driving screw 20 is provided with a first limiting portion 203 along the axial direction of the driving screw 20, the power output end of the second gearbox is provided with a gearbox limiting matching portion, the gearbox limiting matching portion is in sliding fit with the first limiting portion 203, the power output end of the second gearbox and the driving screw 20 can be limited to rotate relatively and can only do relative linear motion, wherein the gearbox limiting matching portion can adopt a structure the same as that of the first limiting matching portion 420, and details are not repeated herein.

In one embodiment, referring to fig. 3 and 5, the fixing screw 10 is hollow, the power portion 41 may be disposed inside the fixing screw 10, the linear motor 1000 further includes an installation cylinder 700 and a control board 800, the installation cylinder 700 is disposed inside the fixing screw 10, the control board 800 is disposed inside the installation cylinder 700, the control board 800 has electronic components, the control board 800 is electrically connected to the driving mechanism 40 for controlling the driving mechanism 40, and specifically, the control board 800 may be electrically connected to the power portion 41 or the third motor for controlling the power portion 41 or the third motor, such as controlling the start, the stop, the speed, and the like, but is not limited thereto. So set up, through settling control panel 800 in installation section of thick bamboo 700, and installation section of thick bamboo 700 is installed in the inside of stationary screw 10 to can realize the control to actuating mechanism 40 in the inside of stationary screw 10, realize high integration, improve linear electric motor 1000's structural density, need not to set up the control part in addition in linear electric motor 1000's outside. Further, a through hole is formed near one end of the fixing screw rod 10 connected to the first outer tube 200, and a through hole is correspondingly formed in the first outer tube 200 for a power line or other conducting wires to penetrate through to communicate the control board 800 with an external circuit or power supply.

Alternatively, in an embodiment, referring to fig. 3 and 5, the mounting cylinder 700 includes a cylinder portion 710, a first supporting portion 720, and a second supporting portion 730, wherein the first supporting portion 720 is connected to one end of the cylinder portion 710, and the second supporting portion 730 is connected to the other end of the cylinder portion 710; the control board 800 is located inside the barrel portion 710, and two ends of the control board 800 are respectively connected to the first supporting portion 720 and the second supporting portion 730, and specifically, two ends of the control board 800 can be respectively abutted against or clamped to the first supporting portion 720 and the second supporting portion 730. So set up, be convenient for control panel 800 to install in installation section of thick bamboo 700 to can prevent to take place relative rotation between control panel 800 and the installation section of thick bamboo 700, improve control panel 800's the arrangement steadiness.

Optionally, in an embodiment, referring to fig. 3 and 5, the barrel 710 is provided with a plurality of heat dissipation holes, so as to dissipate heat generated by the control board during operation, thereby improving safety.

Optionally, in an embodiment, referring to fig. 3 and 5, the inner surface of the fixing screw 10 is provided with a third limiting portion 102 along the axial direction of the fixing screw 10, the outer surface of the first supporting portion 720 is provided with a third limiting matching portion 7201 matched with the third limiting portion 102, and the outer surface of the second supporting portion 730 is provided with a fourth limiting matching portion 7301 matched with the third limiting portion 102, of course, only the outer surface of the first supporting portion 720 may be provided with the third limiting matching portion 7201 matched with the third limiting portion 102, or only the outer surface of the second supporting portion 730 may be provided with the fourth limiting matching portion 7301 matched with the third limiting portion 102; wherein, the third spacing portion 102 can be the sand grip, and third spacing cooperation portion 7201 and fourth spacing cooperation portion 7301 are the spout then, and the third spacing portion 102 can be the spout, and third spacing cooperation portion 7201 and fourth spacing cooperation portion 7301 are the sand grip then. So set up, cooperate through third spacing portion 102 and third spacing cooperation portion 7201 and fourth spacing cooperation portion 7301, can restrict and take place relative rotation between installation section of thick bamboo 700 and the fixed screw 10 to improve the steadiness of installation section of thick bamboo 700 and the control panel 800 that is located installation section of thick bamboo 700 inside.

In one embodiment, referring to fig. 3, 5 and 6, the linear motor 1000 further includes a power supply assembly 900, the power supply assembly 900 is disposed inside the first outer tube 200, specifically, the power supply assembly 900 may be disposed between one end of the fixing screw 10 and one end of the first outer tube 200, may be disposed near the fixing portion 50, and of course, the power supply assembly 900 may be disposed at other positions in the first outer tube 200; the power supply module 900 is electrically connected to the driving mechanism 40, the power supply module 900 may further have a power cord, the power cord may extend to the outside of the first outer tube 200 to be electrically connected to the power supply, and the power supply module 900 may be configured to convert an input power voltage into various levels of operating voltages required by the driving mechanism 40 or the control board 800; the power supply module 900 has components such as a circuit board and an adapter, and it can be understood that it may have other various components required for implementing power supply voltage conversion, and those skilled in the art can set the components according to the actual application requirements. With such an arrangement, the power supply module 900 is directly arranged in the linear motor 1000, so that the linear motor 1000 can work after being directly connected with an external power supply, and other peripheral configurations do not need to be additionally arranged outside the linear motor 1000.

In one embodiment, referring to fig. 2, 5 and 9, one end of the driving screw 20 has a flange 21, the linear motor 1000 further includes a guide part 500 and an end bearing 600, the guide part 500 may be in a hollow sleeve shape or a nut shape, the guide part 500 is sleeved on the driving screw 20 at an end close to the flange 21, the guide part 500 is in clearance fit with an outer surface of the driving screw 20 so that the guide part 500 and the driving screw 20 can rotate relative to each other, one end of the second outer tube 300 is connected to the guide part 500, and the end bearing 600 is located between the guide part 500 and the flange 21 and connected to the guide part 500 and the flange 21 so that the driving screw 20 and the guide part 500 can rotate relative to each other through the end bearing 600; wherein, the outer surface of the guiding part 500 is matched with the inner surface of the first outer tube 200, or the outer surface of the second outer tube 300 is matched with the inner surface of the first outer tube 200, or the outer surface of the guiding part 500 and the outer surface of the second outer tube 300 are both matched with the inner surface of the first outer tube 200, so as to limit the relative rotation of the guiding part 500 and the first outer tube 200, when the flange 21 and the driving screw rod 20 rotate relative to the fixed screw rod 10 and do linear motion, the guiding part 500 can be driven by the end face bearing 600 to do linear motion, the guiding part 500 drives the second outer tube 300 to do linear motion, so that the second outer tube 300 only does linear motion to realize lifting; the outer surface of the guide portion 500 is matched with the inner surface of the first outer tube 200, the outer surface of the guide portion 500 may be in a shape matched with the inner surface of the first outer tube 200, for example, both of them are non-circular (for example, polygonal such as quadrilateral, pentagonal, etc., when quadrilateral, the first outer tube 200 may be a square tube), or the outer surface of the guide portion 500 may be provided with a convex strip, the inner surface of the first outer tube 200 is provided with a sliding groove in sliding fit with the convex strip on the guide portion 500 along the length direction thereof, or the outer surface of the guide portion 500 is provided with a sliding groove, the inner surface of the first outer tube 200 is provided with a convex strip in sliding fit with the sliding groove on the guide portion 500 along the length direction thereof, for example, four corners of the inner surface of the first outer tube 200 are respectively provided with a convex strip along the length direction thereof; 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 of the second outer tube 300 may be in a shape adapted to the inner surface of the first outer tube 200, for example, both are non-circular (e.g., polygonal such as quadrilateral, pentagonal, etc.), or the outer surface of the second outer tube 300 may be provided with a convex strip, the inner surface of the first outer tube 200 is provided with a sliding groove in sliding fit with the convex strip on the second outer tube 300 along the length direction thereof, or the outer surface of the second outer tube 300 is provided with a sliding groove, and the inner surface of the first outer tube 200 is provided with a convex strip in sliding fit with the sliding groove on the second outer tube 300 along the length direction thereof. It should be noted that, the matching manner between the second outer tube 300 and the driving screw rod 20 is not limited to this, in some other embodiments, one end of the second outer tube 300 may be directly connected with the driving screw rod 20 through a bearing, and one end of the second outer tube 300 may also be directly clearance-rotatably matched with the driving screw rod 20 without being rotatably connected through an intermediate member.

In one embodiment, the transmission device 100 further includes a lead screw nut 30, the lead screw nut 30 is sleeved on the active lead screw 20, an inner surface of the lead screw nut 30 is provided with an inner thread, and the active lead screw 20 can drive the lead screw nut 30 to move along the axial direction of the active lead screw 20 through a second outer thread 202; the third outer tube 400 may be connected to the lead screw nut 30 to be movable with the lead screw nut 30 in the axial direction of the active lead screw 20 so as to be liftable with respect to the second outer tube 300; the lead screw nut 30 is sleeved on the active lead screw 20, which means that the lead screw nut 30 is directly sleeved on the active lead screw 20 or sleeved on the active lead screw 20 through an intermediate component; in one way, the screw nut 30 can be directly sleeved on the driving screw 20 and in threaded fit with the second external thread 202, when the driving screw 20 rotates, the driving screw 20 directly drives the screw nut 30 to make linear motion through the second external thread 202, in this case, the fixed screw 10 can be regarded as a first stage, the first external tube 200 is a first-stage lifting tube, the driving screw 20 can be regarded as a second stage, the second external tube 300 is a second-stage lifting tube, the screw nut 30 can be regarded as a third stage, and the third external tube 400 is a third-stage lifting tube, so that three-stage lifting is realized; alternatively, the lead screw nut 30 may be sleeved on the active lead screw 20 through an intermediate member, and when the active lead screw 20 rotates, the intermediate member may be driven by the second external thread 202 to make a linear motion so as to indirectly drive the lead screw nut 30 to make a linear motion, for example, the intermediate member may be a hollow lead screw sleeved on the active lead screw 20, and the lead screw nut 30 may be in threaded fit with the hollow lead screw, in this case, the fixed lead screw 10 may be regarded as a first stage, the first external tube 200 may be a first-stage lifting tube, the active lead screw 20 may be regarded as a second stage, the second external tube 300 may be a second-stage lifting tube, and the hollow lead screw may be regarded as a third stage, a hollow external tube may be connected to the hollow lead screw as a third-stage lifting tube, the lead screw nut 30 may be regarded as a fourth stage, and the third external tube 400 may be a fourth-stage lifting tube, so as to realize lifting, and so on the hollow lead screw and the hollow external tubes connected to the hollow lead screw may be provided in plural fourth stage, each hollow screw rod can be sleeved from inside to outside in sequence, and the screw rod nut 30 is in threaded fit with the hollow screw rod on the outermost layer, so that multi-stage lifting above four stages can be realized.

Optionally, in an embodiment, referring to fig. 3, fig. 5, fig. 7 and fig. 9, the lead screw nut 30 is in threaded fit with the second external thread 202 of the active lead screw 20, that is, the internal thread of the lead screw nut 30 is matched or screwed with the second external thread 202, the driving lead screw 20 is driven by the driving mechanism 40 to rotate and linearly move relative to the fixed lead screw 10, the active lead screw 20 drives the second outer tube 300 to lift relative to the first outer tube 200, the active lead screw 20 drives the lead screw nut 30 to linearly move relative to the active lead screw 20, and the lead screw nut 30 drives the third outer tube 400 to lift relative to the second outer tube 300, so as to achieve three-level lifting, which is high in stability, and the second outer tube 300 and the third outer tube 400 lift simultaneously, which can improve the lifting efficiency; the outer surface of the lead screw nut 30 can be matched with the inner surface of the second outer tube 300 to limit the relative rotation of the lead screw nut 30 and the second outer tube 300, and only the relative linear motion can be performed, of course, only the outer surface of the third outer tube 400 can be matched with the inner surface of the second outer tube 300, or both the outer surface of the lead screw nut 30 and the outer surface of the third outer tube 400 can be matched with the inner surface of the second outer tube 300; the outer surface of the lead screw nut 30 is engaged with the inner surface of the second outer tube 300, and the outer surface of the guide part 500 is engaged with the inner surface of the first outer tube 200, and the outer surface of the third outer tube 400 is engaged with the inner surface of the second outer tube 300, and the outer surface of the second outer tube 300 is engaged with the inner surface of the first outer tube 200.

Optionally, in an embodiment, referring to fig. 2 and fig. 5, the transmission device 100 further includes a guide support portion 60, the guide support portion 60 is rotatably connected to one end of the driving screw 20, and the guide support portion 60 and the driving screw 20 may be in clearance fit, for example, the outer surface of one end of the driving screw 20 is provided with a smooth section, and the guide support portion 60 is rotatably sleeved on the smooth section, and of course, the guide support portion 60 may also be rotatably connected to the driving screw 20 through a bearing; the outer surface of the guide support 60 is engaged with the inner surface of the third outer tube 400 to limit the relative rotation between the guide support 60 and the third outer tube 400, wherein the engagement between the outer surface of the guide support 60 and the inner surface of the third outer tube 400 may be the engagement between the outer surface of the guide 500 and the inner surface of the first outer tube 200. With this arrangement, the guide support portion 60 can be supported between the driving screw rod 20 and the third outer tube 400, and the guide support portion 60 can only move linearly with the driving screw rod 20 and not rotate with the driving screw rod 20, thereby improving the stability of the relative movement between the driving screw rod 20 and the third outer tube 400.

Optionally, in an embodiment, referring to fig. 1, fig. 2 and fig. 5, a first sealing element 210 is disposed at an end of the first outer tube 200 away from the end fixed to the fixing screw 10, and the first sealing element 210 is sealed between the first outer tube 200 and the second outer tube 300, so that the sealing performance can be improved, foreign matters can be prevented from entering, and a supporting function can be achieved; the end of the second outer tube 300 away from the first outer tube 200 and fixed to the fixing screw 10 is provided with a second sealing member 310, and the second sealing member 310 is sealed between the second outer tube 300 and the third outer tube 400, so that the sealing performance can be improved, the entry of foreign matters can be prevented, and the supporting function can be realized.

Optionally, in an embodiment, the end of the third outer tube 400 is provided with a connecting member 430 in a sealing manner, specifically, the connecting member 430 is disposed at an end of the third outer tube 400 far away from the end where the first outer tube 200 is fixed to the fixing screw 10, and the connecting member 430 can seal the end of the third outer tube 400, so as to prevent external impurities such as dust from entering the third outer tube 400 and affecting the transmission fit between the driving screw 20 and the fixing screw 10, and the transmission fit between the driving screw 20 and the third outer tube 400 or external objects, and can be used to connect with an external object to be lifted, so as to perform a connecting function.

In another embodiment, the transmission device 100 further includes a plurality of lead screw layer assemblies, each of the lead screw layer assemblies is sequentially sleeved from inside to outside, the innermost lead screw layer assembly is sleeved on the active lead screw 20, the third outer tube can be connected to the outermost lead screw layer assembly, the active lead screw 20 can drive each of the lead screw layer assemblies to rotate and move along the axial direction of the active lead screw 20, and multi-stage lifting can be achieved.

Optionally, in one embodiment, the screw rod layer assembly includes a hollow screw rod and a sleeve connected to the hollow screw rod, the hollow screw rod is hollow inside, the inner surface of the hollow screw rod is provided with a second internal thread, the outer surface of the hollow screw rod is provided with a fourth external thread, each hollow screw rod is sleeved from inside to outside in sequence, and the second internal thread of the hollow screw rod of the outer layer of the two adjacent hollow screw rods is matched or screwed with the fourth external thread of the hollow screw rod of the inner layer; in the two adjacent screw rod layer assemblies, the sleeve of the screw rod layer assembly on the outer layer is sleeved on the sleeve of the screw rod layer assembly on the inner layer; the hollow screw rod at the innermost layer is sleeved on the active screw rod 20, and the second internal thread of the hollow screw rod at the innermost layer is matched or screwed with the second external thread 202 of the active screw rod 20. The hollow screw rods of the screw rod layer assemblies are driven to do linear movement and/or rotary movement through the second external threads 202 by the rotation of the driving screw rod 20, so that the sleeves of the screw rod layer assemblies can be lifted, and thus, multi-stage lifting is realized. For those skilled in the art, the parameters such as the lead angle of the second external thread 202 and the fourth external thread of each hollow screw rod can be set according to the actual application requirement. Further, the lead screw nut 30 may be screw-fitted to the fourth external thread of the hollow lead screw of the outermost lead screw layer assembly, and the third external tube 400 may be connected to the lead screw nut 30, or of course, the sleeve of the outermost lead screw layer assembly may be removed, and the third external tube 400 may be connected to the hollow lead screw of the outermost lead screw layer assembly.

Optionally, in an embodiment, the hollow screw rod may be replaced by a transmission screw rod and a nut fixedly connected to the transmission screw rod, the transmission screw rod and the nut may be coaxially arranged, the transmission screw rod is hollow inside, a fifth external thread is arranged on the outer surface of the transmission screw rod, the transmission screw rod of each screw rod layer assembly is sequentially sleeved from inside to outside, and the nut of the screw rod layer assembly on the outer layer of the two adjacent screw rod layer assemblies is in threaded fit or screwed fit with the fifth external thread of the screw rod layer assembly on the inner layer; the driving screw rod of the innermost screw rod layer assembly is sleeved on the driving screw rod 20, and the nut of the innermost screw rod layer assembly is matched or screwed with the second external thread 202 of the driving screw rod 20. The nuts and the transmission screw rods of the screw rod layer assemblies are driven to do linear movement and/or rotary movement through the rotation of the driving screw rod 20 and the second external threads 202, so that multi-stage lifting or stretching is realized. For those skilled in the art, the parameters such as the lead angle of the second external thread 202 and the internal thread of the nut of each lead screw layer assembly can be set according to the actual application.

Optionally, in an embodiment, the screw rod layer assembly includes a driven screw rod, a transmission nut, a driven member and a lifting outer tube, the driven screw rod is hollow inside, the inner surface of the driven screw rod is provided with a second limiting portion along the axial direction of the driven screw rod, the outer surface of the driven screw rod is provided with a third external thread, the transmission nut is rotatably connected with one end of the driven screw rod, specifically, the transmission nut can be connected with one end of the driven screw rod through a bearing, so that the driven screw rod and the transmission nut can rotate relatively, and of course, the transmission nut can also be directly rotatably matched with the driven screw rod without a bearing; the driven part is provided with a second limit matching part which is matched with the second limit part in a sliding way, specifically, the second limit part can be a raised line which is convexly arranged on the inner surface of the driven screw rod along the axial direction of the driven screw rod, the second limit matching part can be a sliding groove which is arranged on the outer peripheral surface of the driven part, of course, the second limit part may be a sliding groove recessed in the inner surface of the driven screw rod along the axial direction of the driven screw rod, the second limit matching part may be a convex strip or a protrusion protruding from the outer peripheral surface of the driven member, the driven member is an intermediate power transmission member capable of transmitting the rotation force of the driving screw rod to the driven screw rod or transmitting the rotation force of the driven screw rod to another driven screw rod, for example, the driven member may be a spline, the driven member can be a driven member in a cylindrical shape, a fan shape or a strip shape, or can be other driven members in a regular or irregular shape, and the function of the driven member is similar to that of the linkage member 42; the lifting outer pipe is positioned in the second outer pipe 300 and sleeved on the driven screw rod, and the lifting outer pipe is connected to the transmission nut so as to be capable of moving along with the transmission nut; wherein, the driven screw rod of the innermost screw rod layer assembly is sleeved on the driving screw rod 20, the transmission nut of the innermost screw rod layer assembly is in threaded fit with the second external thread 202, the driven member of the innermost screw rod layer assembly is fixed on the driving screw rod 20, the outer surface of the transmission nut of the innermost screw rod layer assembly is matched with the inner surface of the second external pipe 300 so as to limit the relative rotation of the transmission nut and the second external pipe 300, of course, only the outer surface of the lifting external pipe is matched with the inner surface of the second external pipe 300, or the outer surface of the transmission nut and the outer surface of the lifting external pipe are matched with the inner surface of the second external pipe 300, wherein, the outer surface of the transmission nut of the innermost screw rod layer assembly is matched with the inner surface of the second external pipe 300, or the outer surface of the guide part 500 is matched with the inner surface of the first external pipe 200, the outer surface of the lifting outer tube is matched with the inner surface of the second outer tube 300, and the outer surface of the second outer tube 300 is matched with the inner surface of the first outer tube 200; the screw rod nut 30 can be in threaded fit with a third external thread of a driven screw rod of the screw rod layer assembly on the outermost layer, and when the number of the screw rod layer assemblies is one, the screw rod layer assembly on the outermost layer and the screw rod layer assembly on the innermost layer are the same; the outer surface of the feed screw nut 30 can be matched with the inner surface of the lifting outer tube of the outermost feed screw layer assembly to limit the relative rotation of the feed screw nut 30 and the lifting outer tube, of course, only the outer surface of the third outer tube 400 may be matched with the inner surface of the lifting outer tube of the outermost screw layer assembly, both the outer surface of the screw nut 30 and the outer surface of the third outer tube 400 may be matched with the inner surface of the lifting outer tube of the outermost screw layer assembly, wherein, the outer surface of the feed screw nut 30 is matched with the inner surface of the lifting outer tube of the outermost feed screw layer component, the above-mentioned manner of the outer surface of the guide part 500 being fitted to the inner surface of the first outer tube 200, the manner of the outer surface of the third outer tube 400 being fitted to the inner surface of the lifting outer tube of the outermost screw rod layer assembly, the outer surface of the second outer tube 300 may be engaged with the inner surface of the first outer tube 200; the driving screw rod 20 can drive each screw rod layer assembly to rotate and move along the axial direction of the driving screw rod 20, so that the lifting outer tubes of each screw rod layer assembly are lifted simultaneously, and four-stage and multi-stage lifting above four-stage is realized.

Specifically, when the number of the screw layer assemblies is one, the driving screw 20 is driven by the driving mechanism 40 to perform a rotational motion and a linear motion, the driving screw 20 drives the second outer tube 300 to ascend and descend relative to the first outer tube 200, the driving screw 20 drives the driven screw to rotate through the driven member when performing the rotational motion, and simultaneously drives the transmission nut of the screw layer assembly to perform the linear motion relative to the driving screw 20 through the second external thread 202, so that the driven screw performs the linear motion and the rotational motion simultaneously, the transmission nut drives the ascending and descending outer tube to ascend and descend relative to the second outer tube 300, the driven screw performs the rotational motion to drive the screw nut 30 to perform the linear motion through the third external thread thereof, the screw nut 30 drives the third outer tube 400 to ascend and descend relative to the ascending and descending outer tube, in this case, the fixed screw 10 can be regarded as a first stage, and the first outer tube 200 can be regarded as a first stage ascending and descending tube, the driving screw rod 20 can be regarded as a second stage, the second outer tube 300 can be regarded as a second-stage lifting tube, the driven screw rod can be regarded as a third stage, the lifting outer tube can be regarded as a third-stage lifting tube, the screw nut 30 can be regarded as a fourth stage, and the third outer tube 400 can be regarded as a fourth-stage lifting tube, so that four-stage lifting is realized, the second outer tube 300, the lifting outer tube and the third outer tube 400 can be lifted simultaneously, and the lifting efficiency can be effectively improved.

Specifically, when the number of the screw rod layer assemblies is two or more, the driving screw rod 20 is sleeved with the innermost screw rod layer assembly, the driven screw rod of the second inner screw rod layer assembly is sleeved with the driven screw rod of the innermost screw rod layer assembly, the transmission nut of the second inner screw rod layer assembly is in threaded fit with the third external thread of the driven screw rod of the innermost screw rod layer assembly, the driven member of the second inner screw rod layer assembly is fixed on the driven screw rod of the innermost screw rod layer assembly, the outer surface of the transmission nut of the second inner screw rod layer assembly and/or the outer surface of the lifting outer pipe of the second inner screw rod layer assembly is matched with the inner surface of the lifting outer pipe of the innermost screw rod layer assembly so as to limit the relative rotation of the transmission nut of the second inner screw rod layer assembly and the lifting outer pipe of the innermost screw rod layer assembly, and so on, each screw rod layer assembly is sequentially sleeved from inside to outside, the driving screw rod 20 can rotate and linearly move to drive each screw rod layer assembly to rotate and move along the axial direction of the driving screw rod 20, and the lifting outer pipes of each screw rod layer assembly are lifted simultaneously, so that multi-stage lifting of five stages and more than five stages can be realized.

The embodiment of the present application further provides a lifting device using a linear motor, the lifting device using a linear motor includes the linear motor 1000 of any of the above embodiments, wherein the linear motor is used for providing lifting, and the lifting device using a linear motor is a device that needs to implement a lifting function, such as a lifter, a lifting table, and the like, but is not limited thereto. Because the lifting device using the linear motor provided by the embodiment of the present application adopts the linear motor 1000 of the above embodiment, the lifting device also has the technical effects brought by the technical scheme of the linear motor 1000, and is not described herein again.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle 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:

a transmission, the transmission comprising:

the outer surface of the fixed screw rod is provided with a first external thread;

the driving screw rod is hollow, a first internal thread is arranged on the inner surface of the driving screw rod, the driving screw rod is sleeved on the fixed screw rod, and the first internal thread is matched with the first external thread; the outer surface of the driving screw rod is provided with a second external thread; and

the power output end of the driving mechanism is connected with the driving screw rod and is used for driving the driving screw rod to rotate relative to the fixed screw rod;

the first outer pipe is sleeved on the fixing screw rod;

the second outer pipe is positioned in the first outer pipe and sleeved on the active screw rod, and the second outer pipe is connected to the active screw rod so as to be capable of moving along with the active screw rod; and

a third outer tube located inside the second outer tube, the third outer tube connected to the second external thread of the active screw rod to be capable of moving axially along the active screw rod.

2. A linear motor according to claim 1, wherein: the driving mechanism is arranged on the fixed screw rod;

and/or the inside of the fixed screw rod is hollow, the driving mechanism is arranged inside the fixed screw rod, and the power output end of the driving mechanism extends to the outside of the fixed screw rod and is connected with the active screw rod.

3. A linear motor according to claim 1, wherein: the direction of rotation of the second external thread is opposite to the direction of rotation of the first external thread;

and/or the first internal thread is arranged on the inner surface of the driving screw rod close to the end part of the driving screw rod.

4. The linear motor of claim 1, wherein the stationary screw is hollow inside, the linear motor further comprising:

the mounting cylinder is arranged inside the fixed screw rod; and

the control panel is arranged inside the mounting cylinder and is electrically connected with the driving mechanism and used for controlling the driving mechanism;

wherein, the installation section of thick bamboo includes:

a barrel portion;

a first support part connected to one end of the barrel part; and

a second support part connected to the other end of the barrel part;

the control plate is positioned inside the barrel part, and two ends of the control plate are respectively connected to the first supporting part and the second supporting part;

the inner surface of the fixed screw rod is provided with a third limiting part along the axial direction of the fixed screw rod, the outer surface of the first supporting part is provided with a third limiting matching part matched with the third limiting part, and/or the outer surface of the second supporting part is provided with a fourth limiting matching part matched with the third limiting part.

5. The linear motor according to any one of claims 1 to 4, wherein a first stopper is provided on an inner surface of the driving screw in an axial direction of the driving screw, and the driving mechanism includes:

the power part is fixed on the fixed screw rod and is provided with a power output shaft; and

the linkage piece is fixed on the power output shaft and is positioned inside the driving screw rod, the linkage piece is provided with a first limiting matching part, and the first limiting matching part is in sliding fit with the first limiting part;

wherein the power part is a first motor; or, the power section includes:

the second motor is fixed on the fixed screw rod; and

the first gear box is connected with an output shaft of the second motor and is provided with the power output shaft.

6. A linear motor according to any one of claims 1 to 4, characterized in that: the linear motor further comprises a power supply assembly, the power supply assembly is arranged inside the first outer pipe, and the power supply assembly is electrically connected with the driving mechanism;

and/or a connecting piece is sealed at the end part of the third outer pipe;

and/or the transmission device further comprises a fixing part, one end of the fixing screw rod is fixed on the fixing part, and one end of the first outer tube is fixed on the fixing part; the fixing part is provided with a groove, and one end of the fixing screw rod is inserted into the groove.

7. A linear motor according to any one of claims 1 to 4, characterized in that: one end of the second outer pipe is connected with the driving screw rod through a bearing; or, one end of the active screw rod is provided with a flange, and the linear motor further comprises:

the guide part is sleeved on the driving screw rod, and one end of the second outer pipe is connected to the guide part; and

an end bearing located between and connected to the pilot and the flange;

wherein the outer surface of the guide part and/or the second outer tube is matched with the inner surface of the first outer tube so as to limit the relative rotation of the guide part and the first outer tube.

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

9. A linear motor according to any one of claims 1 to 4, characterized in that: the transmission device further comprises a guide supporting part, the guide supporting part is rotatably connected to one end of the driving screw rod, and the outer surface of the guide supporting part is matched with the inner surface of the third outer tube so as to limit the relative rotation of the guide supporting part and the third outer tube.

10. The utility model provides an use linear electric motor's elevating gear which characterized in that: a linear motor comprising a motor as claimed in any one of claims 1 to 9.