CN217458628U

CN217458628U - Screw lifting mechanism

Info

Publication number: CN217458628U
Application number: CN202221017883.3U
Authority: CN
Inventors: 孙倩; 南奋勇
Original assignee: Shenzhen Zhaowei Machinery and Electronics Co Ltd
Current assignee: Shenzhen Zhaowei Machinery and Electronics Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-09-20
Anticipated expiration: 2032-04-28

Abstract

The application relates to the technical field of transmission and discloses a lead screw lifting mechanism. The screw rod lifting mechanism comprises a shell, a screw rod assembly, a driving assembly and an elastic piece; the screw assembly comprises a screw and a screw nut which are arranged in the shell, and the screw nut is in threaded fit with the screw; the driving assembly comprises a driving piece and a gear assembly, the driving piece is connected to the lead screw and is used for driving the lead screw to rotate around the shaft, the gear assembly comprises a main gear connected to the output end of the driving piece and a driven gear movably sleeved at one end of the lead screw along the axial direction of the lead screw, and the main gear is in transmission connection with the driven gear; along the axial direction of the screw rod, an accommodating gap is formed between the slave gear and the bottom wall of the shell, and the elastic piece is arranged in the accommodating gap and is abutted against the bottom wall of the shell and the slave gear. The application provides a lead screw elevating system can be used to drive the component and do elevating movement or be used for transporting the object, thereby can solve among the current lead screw elevating system the gear and have the technical problem who scurries the volume when being connected with the lead screw and influence gear life-span and whole mechanism noise.

Description

Screw lifting mechanism

Technical Field

The application relates to the technical field of transmission, especially, relate to a lead screw elevating system.

Background

The screw is the most commonly used transmission element on tool machinery and precision machinery, and its main function is to convert rotary motion into linear motion or convert torque into axial repeated acting force, and has the characteristics of high precision, reversibility and high efficiency.

In the related art, the lead screw is connected with the motor through structures such as gears, and then rotary motion is converted into linear motion, and the lead screw can be used as a lifting mechanism and applied to various production lines. The lead screw includes interference fit and clearance fit two kinds of modes with gear connection, wherein, when the gear assembles on the lead screw through clearance connection's mode, the gear position is difficult for fixing, has the volume of scurrying in gear and lead screw operation process, and the gear is skew easily promptly and is predetermine the mounted position to influence the transmission effect of gear, and produce the use noise easily.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a lead screw elevating system for thereby there is the technical problem who scurries volume influence gear life-span and whole mechanism noise when solving among the current lead screw elevating system gear and screw connection.

In order to solve the above problem, the present application discloses a screw elevating mechanism, includes:

a housing;

the screw assembly comprises a screw arranged in the shell and a screw nut sleeved on the screw, and the screw nut is in threaded fit with the screw;

the driving component comprises a driving part and a gear component, the driving part is connected to the lead screw through the gear component and is used for driving the lead screw to rotate around a shaft, the gear component comprises a main gear connected to the output end of the driving part and a driven gear movably sleeved at one end of the lead screw along the axial direction of the lead screw, and the main gear is in transmission connection with the driven gear; an accommodating gap is formed between the driven gear and the bottom wall of the shell along the axial direction of the lead screw;

and the elastic piece is arranged in the accommodating gap and is abutted with the bottom wall of the shell and the driven gear.

In one embodiment, the elastic member is a spring.

In one embodiment, the lead screw comprises an installation part and a connection part which are axially connected, the lead screw nut is movably sleeved on the installation part along the axial direction of the lead screw, and the slave gear is fixedly sleeved on the connection part along the radial direction of the lead screw.

In one embodiment, the shaft section of the connecting part of the lead screw is D-shaped, and the inner hole of the slave gear is a D-shaped hole.

In an embodiment, the gear assembly further comprises at least one carrier gear connected between the master gear and the slave gears.

In an embodiment, the screw lifting mechanism further includes a guide rail assembly disposed in the housing, the guide rail assembly includes a guide rail and a slider, the guide rail and the screw are disposed in parallel and at an interval, and the slider is slidably disposed on the guide rail and connected to the screw nut.

In one embodiment, the guide rail assembly comprises one guide rail, and the guide rail is arranged on one side of the lead screw; or, the guide rail assembly comprises two guide rails, and the two guide rails are respectively arranged on two opposite sides of the screw rod.

In an embodiment, the screw lifting mechanism further includes a first bearing and a second bearing for connecting the housing and the screw, the first bearing is disposed at an end of the screw far away from the elastic member, and the second bearing and the elastic member are respectively disposed at two opposite sides of the slave gear.

In one embodiment, the driving member is a driving motor.

In one embodiment, the driving member is electrically connected to an external power source through a connection terminal or a flexible circuit board.

The application provides a lead screw elevating system, which comprises a housin, lead screw assembly, drive assembly and elastic component, lead screw assembly includes that lead screw and cover locate the screw nut on the lead screw, drive assembly includes the driving piece and is used for connecting the gear assembly of driving piece and lead screw, utilize driving piece and gear assembly can drive lead screw pivoting, and drive screw nut along lead screw removal, thereby this lead screw elevating system can locate in the mobile terminal and be used for drive element to do elevating movement, can locate in the production line and be used for transporting the object. Further, the lead screw sets up in the casing, locate the one end of lead screw from the gear movable sleeve, from one side and the lead screw butt of gear, leave the holding clearance between the diapire of opposite side and casing, through set up the elastic component in the holding clearance, and make the elastic component and the diapire of casing and follow gear looks butt, can be fixed in the predetermined mounted position department of lead screw from the gear, thereby can avoid taking place the skew from the gear, solve the problem that has the volume of scurrying when being connected from gear and lead screw and reduce the use noise, make gear assembly and lead screw can normal use. In addition, the elastic piece can absorb vibration and impact quantity, and the use noise generated in the gear rotating process can be further reduced by arranging the elastic piece.

Drawings

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

Fig. 1 is a schematic structural diagram of a lead screw lifting mechanism provided in an embodiment of the present application;

fig. 2 is a schematic perspective view of the screw rod lifting mechanism provided in the embodiment of the present application after a housing is removed;

FIG. 3 is an exploded view of the lead screw lift mechanism of FIG. 2;

FIG. 4 is a cross-sectional view of the lead screw lift mechanism shown in FIG. 2;

FIG. 5 is a schematic structural diagram of a lead screw of the lead screw lifting mechanism shown in FIG. 2;

fig. 6 is a schematic structural view of one end of the screw rod shown in fig. 5, which is indicated by an arrow a.

Description of the main element symbols:

100. a lead screw lifting mechanism;

10. a housing;

20. a lead screw assembly; 21. a lead screw; 211. an installation part; 212. a connecting portion; 22. a lead screw nut;

30. a drive assembly; 31. a drive member; 32. a gear assembly; 321. a main gear; 322. a slave gear; 323. a carrier gear; 33. a flexible circuit board;

40. an elastic member;

50. a connecting member;

61. a first bearing; 62. a second bearing;

70. a guide rail assembly; 71. a guide rail; 72. a slide block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

The application provides a lead screw elevating system can locate in the mobile terminal to be used for drive elements such as camera, push-and-pull screen to do elevating movement, perhaps still can locate in the production line, and be used for transporting the object.

As shown in fig. 1 to 3, the screw elevating mechanism 100 includes a housing 10, a screw assembly 20, a driving assembly 30, and an elastic member 40.

As shown in fig. 1, the housing 10 is provided with a slide way penetrating one side of the housing 10, and the slide way is used for exposing at least part of the lead screw assembly 20.

As shown in fig. 1 and 2, the lead screw assembly 20 includes a lead screw 21 disposed in the housing 10 and a lead screw nut 22 sleeved on the lead screw 21, and the lead screw nut 22 is in threaded engagement with the lead screw 21. The lead screw nut 22 is provided with a connecting piece 50, the connecting piece 50 extends out of the housing 10 through the slideway and is used for connecting an element or an object to be moved, and the connecting piece 50 can slide along the slideway under the driving of the lead screw 21 and the lead screw nut 22. The slideway extends along the axial direction of the screw 21 and has a clearance effect on the movement of the connecting piece 50.

As shown in fig. 1, 2 and 3, the driving assembly 30 includes a driving member 31 and a gear assembly 32, the driving member 31 is connected to the lead screw 21 through the gear assembly 32 and is used for driving the lead screw 21 to rotate around the axis, the gear assembly 32 includes a main gear 321 connected to an output end of the driving member 31 and a slave gear 322 movably sleeved on one end of the lead screw 21 along an axial direction of the lead screw 21, and the main gear 321 is in transmission connection with the slave gear 322. The driving member 31 can drive the master gear 321 and the slave gear 322 to rotate, thereby driving the lead screw 21 to rotate around the axis and moving the lead screw nut 22 along the lead screw 21.

As shown in fig. 2, 3 and 4, an accommodation gap is formed between the gear 322 and the bottom wall of the housing 10 in the axial direction of the screw 21, and the elastic member 40 is disposed in the accommodation gap and abuts against the bottom wall of the housing 10 and the gear 322.

The application provides a lead screw elevating system 100, including casing 10, lead screw assembly 20, drive assembly 30 and elastic component 40, lead screw assembly 20 includes lead screw 21 and the screw nut 22 of cover on locating lead screw 21, drive assembly 30 includes driving piece 31 and is used for connecting driving piece 31 and screw 21's gear assembly 32, utilize driving piece 31 and gear assembly 32 can drive lead screw 21 pivoting, and drive screw nut 22 and remove along lead screw 21, thereby this lead screw elevating system 100 can locate in the mobile terminal and be used for the drive element to do elevating movement, or can locate in the production line and be used for transporting the object. Further, the screw 21 is disposed in the housing 10, the slave gear 322 is movably sleeved at one end of the screw 21 along the axial direction, one side of the slave gear 322 abuts against the screw 21, a receiving gap is reserved between the other side of the slave gear 322 and the bottom wall of the housing 10, the elastic element 40 is disposed in the receiving gap, the elastic element 40 abuts against the bottom wall of the housing 10 and the slave gear 322, the slave gear 322 can be fixed at a preset installation position of the screw 21, so that the offset of the slave gear 322 can be avoided, the problem of channeling when the slave gear 322 is connected with the screw 21 is solved, the use noise is reduced, and the gear assembly 32 and the screw 21 can be normally used. In addition, the elastic member 40 can absorb the amount of vibration and impact, and by providing the elastic member 40, the use noise generated from the rotation of the gear 322 can be further reduced.

The screw lift mechanism 100 provided in the present application is not unique in the type of the elastic member 40.

In some embodiments, as shown in fig. 2, 3 and 4, the elastic member 40 may be a spring. The spring has excellent elastic deformation capacity and larger elastic force, and the spring is used for supporting the driven gear 322, so that the positioning effect is better. In addition, the spring can absorb vibration and impact, the damping effect is obvious, and the use noise of the slave gear 322 can be greatly reduced.

In some embodiments, the elastic member 40 may also be a rubber pad. The rubber pad has the advantages of good wear resistance, high elasticity, high breaking strength and the like, is not easy to deform and lose efficacy, is supported by the elastic pad against the driven gear 322, and has high reliability and long service life.

The screw lifting mechanism 100 provided by the present application is, as shown in fig. 2, fig. 3 and fig. 5, the screw 21 includes an installation portion 211 and a connection portion 212 which are axially connected, the connection portion 212 is connected to one end of the installation portion 211, the installation portion 211 is a threaded structure, and the screw nut 22 is movably sleeved on the installation portion 211 along the axial direction of the screw 21, and is fixedly sleeved on the connection portion 212 along the radial direction of the screw 21 from the gear 322.

Alternatively, the connection portion 211 and the connection portion 212 may have a stepped structure, and the connection portion 212 may have a smaller cross-sectional size at an end thereof close to the connection portion 211, and the slave gear 322 may be sleeved on the connection portion 212 and may have one side abutting against a stepped surface formed by the connection portion 211.

Further, the shaft section of the connecting part 212 of the screw 21 is in a special-shaped shape, the inner hole of the slave gear 322 is a special-shaped hole matched with the connecting part 212 of the screw 21, and the connecting part 212 is fixedly connected with the slave gear 322 in the radial direction. Adopt above-mentioned design, from gear 322 accessible clearance connection (non-interference fit) mode activity cover locate the connecting portion 212 of lead screw 21 on, in the transmission process, lead screw 21 is difficult for buckling deformation to it is convenient to assemble from gear 322 and lead screw 21.

The screw elevating mechanism 100 provided by the present application has a specific structure that is not unique when the axial cross section of the connecting portion 212 of the screw 21 is a special-shaped shape.

In some embodiments, as shown in fig. 3, 5 and 6, the shaft section of the connecting portion 212 of the screw 21 is D-shaped, and the inner hole of the slave gear 322 is a D-shaped hole matched with the connecting portion 212. By adopting the design, the screw 21 and the driven gear 322 have simple structures and convenient assembly.

In some embodiments, the shaft section of the connecting portion 212 of the screw 21 is a polygon such as a triangle, a quadrangle, or a pentagon, and the inner hole of the slave gear 322 is a triangular prism, a quadrangular prism, or a pentagonal prism that is adapted to the connecting portion 212. By adopting the design, the shapes of the lead screw 21 and the slave gear 322 are regular, and the processing and the manufacturing are convenient.

In some embodiments, the outer wall surface of the connecting portion 212 of the screw 21 is provided with a spline protrusion, and the inner hole of the slave gear 322 is provided with a spline sleeve. By adopting the design, the assembly precision between the screw rod 21 and the driven gear 322 is high, and the work is reliable.

In the screw lifting mechanism 100 provided by the present application, the gear assembly 32 may be a single-stage transmission structure or a multi-stage transmission structure, and when the gear assembly 32 is a multi-stage transmission structure, a speed reducer may be included. The multistage transmission structure has the advantages of small size, high transmission efficiency, accurate transmission ratio and the like, the speed reducer is composed of gear pairs at different levels, and the speed reducer can be used for increasing mechanical speed reduction and torque.

In the lead screw lifting mechanism 100 provided by the present application, the gear assembly 32 further includes at least one intermediate gear 323, and the intermediate gear 323 is connected between the master gear 321 and the slave gear 322.

Alternatively, in an embodiment, the gear assembly 32 employs a three-stage gear transmission, as shown in fig. 2, 3 and 4, the gear assembly 32 includes a master gear 321 connected to the output end of the driving member 31, a slave gear 322 connected to the lead screw 21, and a carrier gear 323 connected between the master gear 321 and the slave gear 322. By adopting the design, the gap bridge gear 323 is additionally arranged, so that the gear radius is convenient to reduce, the occupied space of the gear assembly 32 can be reduced, the gear assembly 32 is reasonable in structure, and the design and the assembly are convenient. In addition, the three-level gear has good transmission effect and can well drive the screw rod 21 to rotate around the shaft.

The lead screw lifting mechanism 100 provided by the application further comprises a guide rail assembly 70 arranged in the housing 10, the guide rail assembly 70 comprises a guide rail 71 and a slider 72, the guide rail 71 and the lead screw 21 are parallel and arranged at intervals, and the slider 72 is arranged on the guide rail 71 in a sliding manner and connected to the lead screw nut 22. By adopting the design, in the process that the lead screw 21 rotates around the shaft, the lead screw nut 22 can be driven to move along the lead screw 21, the sliding block 72 can be driven to move along the guide rail 71, the guide rail 71 and the sliding block 72 can share the radial stress of the lead screw 21, the lead screw 21 is only used for providing axial driving force, the lead screw 21 is not easy to bend and deform, the reliability is high, and the service life is long.

Further, the number and arrangement of the guide rails 71 are not exclusive.

In some embodiments, as shown in fig. 2 and 3, the guide rail assembly 70 includes two guide rails 71, and the two guide rails 71 are respectively disposed on two opposite sides of the screw 21. By adopting the design, the guide rail assembly 70 has good guiding effect, the sliding block 72 and the lead screw nut 22 are stressed uniformly, and the reliability is high.

In some embodiments, the rail assembly 70 includes a rail 71, and the rail 71 is disposed on one side of the lead screw 21. By adopting the above design, the guide rail assembly 70 has a simple structure and is convenient to design and install.

It will be appreciated that in some embodiments, the slider 72 and the lead screw nut 22 may be machined as a unitary structure.

The screw lifting mechanism 100 provided by the present application, as shown in fig. 2, 3 and 4, further includes a first bearing 61 and a second bearing 62 for connecting the housing 10 and the screw 21, the first bearing 61 is disposed at one end of the screw 21 far away from the elastic component 40, and the second bearing 62 and the elastic component 40 are respectively disposed at two opposite sides of the slave gear 322. By adopting the design, two ends of the screw 21 are respectively fixed on the shell 10 through the first bearing 61 and the second bearing 62, the screw 21 is firmly connected with the shell 10, and the screw 21 is good in fixing effect. In addition, the bearing has advantages such as mechanical efficiency is high, easy start, the precision is high, the load is big, utilizes first bearing 61 and second bearing 62 as fixed connection 50, can reduce the energy loss in the lead screw 21 use, and the reliability is high and long service life.

Further, the first bearing 61 and the second bearing 62 may be ball bearings or roller bearings. Optionally, in the embodiments provided in the present application, the first bearing 61 and the second bearing 62 are ball bearings.

It is understood that in some embodiments, the screw 21 may also have one end fixed to the housing 10 and the other end freely disposed, or the screw 21 may also have one end fixed to the housing 10 and the other end simply supported, and may be designed according to practical situations, and is not limited herein.

In the lead screw lifting mechanism 100 provided by the present application, the driving member 31 is a driving motor.

Wherein, the driving motor can be a servo motor or a stepping motor. Optionally, in an embodiment provided by the present application, the driving motor is a servo motor. The servo motor has the advantages of high precision, strong adaptability, stable operation and the like, and the adjustment precision and the operation stability of the screw lifting mechanism 100 can be improved by driving the screw 21 to rotate by the servo motor.

The present application provides a lead screw lifting mechanism 100, and the connection mode of the driving member 31 and the external power supply is not unique.

In some embodiments, the driving member 31 is electrically connected to an external power source through a terminal. The connecting terminal has the advantages of low cost, convenient use and the like, and the quick connection between the driving piece 31 and an external power supply can be realized by utilizing the connecting terminal.

In some embodiments, as shown in fig. 2 and 3, the driving member 31 is electrically connected to an external power source through a flexible circuit board 33. The flexible circuit board 33 has the advantages of small volume, low mass, free bending, good heat dissipation and the like, and the driving piece 31 and the external power supply are connected by utilizing the flexible circuit board 33, so that the connection effect is good, and the reliability is high.

In summary, in the screw lifting mechanism 100 provided in the present application, the elastic member 40 is additionally disposed in the housing 10, and the elastic member 40 is abutted against the bottom wall of the housing 10 and the slave gear 322, so that the slave gear 322 can be fixed to the predetermined mounting position of the screw 21, and the slave gear 322 can be prevented from being displaced, thereby solving the problem of displacement when the slave gear 322 is connected to the screw 21, reducing the use noise, and enabling the gear assembly 32 and the screw 21 to be normally used. In addition, the elastic member 40 can absorb the amount of vibration and impact, and by providing the elastic member 40, the use noise generated from the rotation of the gear 322 can be further reduced. In addition, by providing the guide rails 71 and the sliders 72 on the opposite sides of the lead screw 21, radial stress of the lead screw 21 can be shared, and bearing stress of the lead screw 21 can be reduced, so that deformation of the lead screw 21 can be avoided, and reliability and service life of the lead screw lifting mechanism 100 can be improved.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A lead screw lifting mechanism is characterized by comprising:

a housing;

2. The lead screw lift mechanism of claim 1, wherein the resilient member is a spring.

3. The screw lifting mechanism according to claim 1, wherein the screw includes an installation portion and a connection portion, the screw nut is movably sleeved on the installation portion along an axial direction of the screw, and the slave gear is fixedly sleeved on the connection portion along a radial direction of the screw.

4. The screw lifting mechanism according to claim 3, wherein the shaft section of the connecting portion of the screw is D-shaped, and the inner hole of the slave gear is a D-shaped hole.

5. The screw lift mechanism of claim 1, wherein said gear assembly further comprises at least one carrier gear connected between said master gear and said slave gear.

6. A lead screw lifting mechanism according to any one of claims 1 to 5, further comprising a guide rail assembly disposed within the housing, the guide rail assembly comprising a guide rail and a slider, the guide rail being disposed parallel to and spaced from the lead screw, the slider being slidably disposed on the guide rail and connected to the lead screw nut.

7. The screw lift mechanism of claim 6, wherein said rail assembly includes one said rail, and said rail is disposed on one side of said screw; or, the guide rail assembly comprises two guide rails, and the two guide rails are respectively arranged on two opposite sides of the screw rod.

8. A lead screw lifting mechanism according to any one of claims 1 to 5, further comprising a first bearing and a second bearing for connecting the housing and the lead screw, wherein the first bearing is disposed at an end of the lead screw remote from the elastic member, and the second bearing and the elastic member are disposed at opposite sides of the slave gear, respectively.

9. Lead screw lifting mechanism according to one of the claims 1 to 5, characterized in that the drive member is a drive motor.

10. A lead screw lifting mechanism according to any one of claims 1 to 5, wherein the driving member is electrically connected to an external power source via a connection terminal or a flexible circuit board.