CN214630716U

CN214630716U - Linear actuator for lifting table

Info

Publication number: CN214630716U
Application number: CN202022808776.XU
Authority: CN
Inventors: 胡蒙天; 李占元
Original assignee: Ningbo Healthkey Motion Technology Co ltd
Current assignee: Ningbo Healthkey Motion Technology Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-11-09
Anticipated expiration: 2030-11-27

Abstract

The utility model provides a linear actuator for lift table belongs to lift table technical field. The linear actuator comprises a motor, a screw rod, a worm wheel and a worm meshed with the worm wheel, the motor comprises a motor shaft, the motor shaft is fixedly connected with the worm or is of an integrated structure, the linear actuator further comprises a driving shaft, a driving bevel gear and a driven bevel gear meshed with the driving bevel gear, the driving bevel gear is mounted on the driving shaft and rotates coaxially with the worm wheel, the driven bevel gear is connected with the screw rod, and at least one of the driving bevel gear, the driving shaft, the motor shaft and the screw rod is provided with a self-locking device for realizing self-locking of the linear actuator. The utility model has the advantages of, adopt this kind of structure for can improve linear actuator's auto-lock ability, the utility model is used for control lift table goes up and down.

Description

Linear actuator for lifting table

[ technical field ] A method for producing a semiconductor device

The utility model relates to a linear actuator for lifting table belongs to lifting table technical field.

[ background of the invention ]

The lifting table is widely applied to the fields of home furnishing, medical treatment and the like, the lifting table used commonly comprises a table plate and a lifting stand column used for controlling lifting, the lifting stand column generally comprises a linear actuator, the linear actuator is composed of a motor, a gear transmission mechanism, a screw rod and a nut, the nut is connected with the table plate, the motor drives the screw rod to rotate through the gear transmission mechanism, the screw rod drives the table plate to move up and down through driving the nut when rotating, and the lifting table can be lifted.

Wherein, gear drive structure adopts worm and worm wheel drive's mode usually, adopts this kind of structure, and the worm links to each other with the motor shaft, and the worm wheel links to each other with the lead screw for can realize the transmission, however, the auto-lock ability of this kind of structure is relatively poor.

[ Utility model ] content

The technical problem to be solved of the present invention is to provide a linear actuator for lifting a table, so that the self-locking capability of the linear actuator can be improved.

In order to solve the technical problem, the utility model discloses a linear actuator for lift table include motor, lead screw, worm wheel and with worm wheel meshed worm, the motor includes the motor shaft, the motor shaft with worm fixed connection or structure as an organic whole, linear actuator still include driving shaft, initiative helical gear and with the driven helical gear of initiative helical gear meshing, the initiative helical gear is installed on the driving shaft, the initiative helical gear with the coaxial rotation of worm wheel, driven helical gear with the lead screw links to each other, be equipped with self-lock device on initiative helical gear, driving shaft, motor shaft and the at least one of lead screw for make linear actuator realize the auto-lock.

Preferably, the driving bevel gear or the driving shaft is sleeved with a first torsion spring for realizing self-locking of the linear actuator.

Preferably, the driving helical gear comprises an axially extending shoulder, the first torsion spring is sleeved outside the shoulder and is in interference fit with the surface of the shoulder, the linear actuator further comprises a gear box body, the first torsion spring comprises a first pin, and the gear box body is provided with a positioning groove which is clamped with the first pin to limit the rotation of the first torsion spring.

Preferably, the screw rod is provided with a second torsion spring for realizing self-locking of the linear actuator.

As preferred, the cover is equipped with torsion spring seat and fixing base on the lead screw, torsion spring seat with lead screw circumference location, the second torsional spring cover is established outside the torsion spring seat and with torsion spring seat surface interference fit, linear actuator still includes the gearbox body, the fixing base with gearbox body fixed connection, the second torsional spring includes the second pin, be equipped with on the fixing base with second pin block is in order to restrict second torsional spring pivoted recess.

Preferably, the motor shaft is provided with a friction ring for realizing friction self-locking of the motor shaft.

Preferably, the linear actuator further includes a gear housing, the friction ring includes a ring body and an elastic body, the ring body is circumferentially positioned with the gear housing, the elastic body abuts against the surface of the motor shaft through elastic deformation, and the elastic body limits rotation of the motor shaft through a friction force generated by contact with the motor shaft.

Preferably, both ends of the motor shaft are provided with friction rings.

Preferably, the front end of the worm is sleeved with a sleeve for limiting the radial movement of the worm.

Preferably, the motor shaft and the screw rod are parallel to each other.

The utility model has the advantages that:

firstly, carry out the transmission through initiative helical gear and driven helical gear, can utilize helical gear driven auto-lock ability, improve linear actuator's auto-lock ability, secondly, through set up self-lock device on initiative helical gear, driving shaft, motor shaft and lead screw, can further improve linear actuator's auto-lock ability for linear actuator can realize the auto-lock, thereby can make when the lift table goes up and down more stable.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention will be described in further detail with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of the lifting column of the present invention;

FIG. 2 is a schematic view of the inner and outer tubes of the lifting column of the present invention;

FIG. 3 is a partial exploded view of the lifting column of the present invention;

FIG. 4 is a schematic view of the gear box body and the inside of the gear box body in the lifting column of the present invention;

FIG. 5 is a schematic view of the inside of the gear box body in the lifting column of the present invention;

FIG. 6 is a partial exploded view of the electric push rod of the lifting column of the present invention;

fig. 7 is a schematic view of the friction ring in the lifting column of the present invention.

Reference numerals:

the device comprises a connecting plate 1, an outer pipe 2, a motor 3, a lead screw 4, a nut 5, an inner pipe 6, an outer pipe sliding strip 7, an end cover 8, a worm 9, a worm wheel 10, a driving bevel gear 11, a driven bevel gear 12, an end bearing 13, a sleeve 14, a second torsion spring 15, a fixed seat 16, a friction ring 17, a first torsion spring 18, a convex shoulder 19, a driving shaft 20, a torsion spring seat 21, an inner pipe sliding strip 22 and a gearbox body 23.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.

In the following description, the terms "inside", "outside", "upper", "lower", "left", "right", and the like, which indicate orientations or positional relationships, are used to indicate orientations or positional relationships based on the drawings, and are only used for convenience in describing embodiments and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 7, a preferred structure of the linear actuator for lifting a table in this embodiment includes a motor 3, a lead screw 4, a worm wheel 10 and a worm 9 engaged with the worm wheel 10, where the motor 3 includes a motor shaft, the motor shaft is fixedly connected with or integrated with the worm 9, the linear actuator further includes a driving shaft 20, a driving bevel gear 11 and a driven bevel gear 12 engaged with the driving bevel gear 11, the driving bevel gear 11 is mounted on the driving shaft 20, the driving bevel gear 11 rotates coaxially with the worm wheel 10, the driven bevel gear 12 is connected with the lead screw 4, and at least one of the driving bevel gear 11, the driving shaft 20, the motor shaft and the lead screw 4 is provided with a self-locking device for enabling the linear actuator to achieve self-locking.

The utility model has the advantages that:

firstly, through the transmission of driving helical gear 11 and driven helical gear 12, can utilize helical gear driven auto-lock ability, improve linear actuator's auto-lock ability, secondly, through set up self-lock device on driving helical gear 11, driving shaft 20, motor shaft and lead screw 4, can further improve linear actuator's auto-lock ability for linear actuator can realize the auto-lock, thereby can make more stable when going up and down the table.

In order to optimize the self-locking device on the driving bevel gear 11 and/or the driving shaft 20, the present embodiment preferably sleeves the first torsion spring 18 for enabling the linear actuator to achieve self-locking on the driving bevel gear 11 or the driving shaft 20, so that the self-locking can be achieved by utilizing the characteristics of the torsion spring.

In order to enable the first torsion spring 18 to realize self-locking, in this embodiment, preferably, the driving helical gear 11 includes a shoulder 19 extending axially, the first torsion spring 18 is sleeved outside the shoulder 19 and is in interference fit with a surface of the shoulder 19, the linear actuator further includes a gear box 23, the first torsion spring 18 includes a first pin, a positioning groove is provided on the gear box 23, and the positioning groove is engaged with the first pin to limit rotation of the first torsion spring 18, and is positioned by the shoulder 19 and the pin, so that the driving helical gear 11 can realize self-locking through the first torsion spring 18.

In order to optimize the self-locking structure on the lead screw 4, in the present embodiment, it is preferable that the lead screw 4 is provided with a second torsion spring 15 for enabling the linear actuator to realize self-locking, so that the self-locking can be realized by utilizing the characteristics of the torsion spring.

In order to make second torsional spring 15 can realize the auto-lock, this embodiment is preferred the cover is equipped with torsion spring seat 21 and fixing base 16 on the lead screw 4, torsion spring seat 21 with 4 circumference location of lead screw, second torsional spring 15 cover is established torsion spring seat 21 outer and with 21 surperficial interference fit of torsion spring seat, linear actuator still includes gear box 23, fixing base 16 with 23 fixed connection of gear box, second torsional spring 15 includes the second pin, be equipped with on the fixing base 16 with second pin block is in order to restrict second torsional spring 15 pivoted recess, adopts this kind of structure, fixes a position through torsion spring seat 21 and fixing base 16 for lead screw 4 can realize the auto-lock through second torsional spring 15.

In order to optimize the self-locking structure on the motor shaft, it is preferable that the motor shaft is provided with a friction ring 17 for enabling the motor shaft to realize friction self-locking in this embodiment, the friction ring 17 can realize friction self-locking in a way of adopting end surface friction and inner surface friction for self-locking, and the end surface friction means that the friction is performed on the surface of the friction ring 17 perpendicular to the axis of the friction ring 17 to realize self-locking.

In order to enable the friction ring 17 to achieve self-locking, in this embodiment, it is preferable that the linear actuator further includes a gear box 23, the friction ring 17 includes a ring body and an elastic body, the ring body is circumferentially positioned with the gear box 23, the elastic body abuts against the surface of the motor shaft through elastic deformation, and the elastic body limits the rotation of the motor shaft through a friction force generated by contacting with the motor shaft, so that the rotation of the motor shaft can be prevented by the friction force between the elastic body and the motor shaft to achieve self-locking.

In order to further increase the self-locking capacity of the motor shaft, the two ends of the motor shaft are respectively provided with the friction rings 17, and the self-locking capacity of the motor shaft can be further increased by simultaneously self-locking the two friction rings 17.

In order to increase the centripetal force of the worm 9, in this embodiment, it is preferable that the front end of the worm 9 is sleeved with a sleeve 14 for limiting the radial movement of the worm 9, the sleeve 14 is used for limiting the radial movement of the worm 9, so that the centripetal force of the worm 9 can be increased, the stability of the movement of the worm 9 is ensured, meanwhile, a limiting groove for limiting the rotation of the sleeve 14 can be arranged on the gear box body 23, the sleeve 14 is clamped with the limiting groove, the sleeve 14 can be installed in the limiting groove in a clamping manner, the limiting groove limits the circumferential rotation of the sleeve 14, a groove with an opening facing the limiting inner part is arranged in the circumferential direction of the limiting groove, and a protrusion is arranged on the sleeve 14 to be engaged with the groove, so that the limiting groove can limit the circumferential rotation of the sleeve 14.

In order to optimize the space of the linear actuator, the motor shaft and the lead screw 4 are preferably parallel to each other in the embodiment, and the helical gear transmission is used for changing the relative position of the motor shaft and the lead screw 4, so that the lead screw 4 can be arranged in parallel with the motor shaft, when the lead screw 4 is arranged in parallel with the motor shaft, the motor 3 can be arranged in parallel with the lead screw 4, and the motor 3 is prevented from occupying space when being vertically arranged with the lead screw 4.

In addition, the linear actuator can be used as an electric push rod for the hidden lifting upright, and when the electric push rod in the lifting table adopts the structure, the hidden lifting upright can have good self-locking capacity, so that the load bearing capacity of the lifting upright can be increased, and meanwhile, the space can be optimized.

The hidden lifting stand column comprises a connecting plate 1 and an electric push rod used for being installed in a wall body, the electric push rod comprises a motor 3, a screw rod 4 and a nut 5, one end of the connecting plate 1 is relatively fixed with the nut 5, the other end of the connecting plate is arranged on a table frame in a radially extending mode along the screw rod 4, the motor 3 drives the screw rod 4 to rotate so as to drive the nut 5 to move up and down, the nut 5 drives the connecting plate 1 to lift when moving, and the connecting plate 1 is located outside the wall body at a position connected with the table frame.

Electric putter installs in the wall body, 1 one end of connecting plate is fixed with nut 5 and is realized going up and down, the other end radially extends along lead screw 4 and links to each other with the table frame, the position that connecting plate 1 links to each other with the table frame is located the wall body outside, make the table frame can be located the wall body outside, support through connecting plate 1 simultaneously, make electric putter in the wall body pass through motor 3 drive nut 5 and remove, nut 5 drives connecting plate 1 and removes, connecting plate 1 can drive the outer table frame of wall body and remove, the table frame and then can drive the table and remove, make the table can remove outside the wall body and go up and down, the wall body can not lead to the fact spacingly to the motion of table, and then make electric putter can hide in the wall body, connecting plate 1 can partially hide in the wall body, even make the lift stand can hide in the wall body, thereby make the lift table whole can be more pleasing to the eye originally, the utility model discloses well lift stand can hide in the wall body means that electric putter can hide in the wall body and even can hide in company The plate 1 may be partially concealed within a wall.

In order to encapsulate electric putter, the lift stand still includes and is used for installing outer tube 2 in the wall body, electric putter is located in outer tube 2, connecting plate 1 part is located in outer tube 2, encapsulates through outer tube 2, and is more convenient when can making electric putter install, can make electric putter and outside keep apart simultaneously, prevents that outside dust or other debris from influencing electric putter motion.

In order to realize a large stroke of the electric push rod, in this embodiment, it is preferable that an end cover 8 is disposed at one end of the outer tube 2, one end of the screw rod 4, which is far away from the motor 3, and the end cover 8 are axially and radially positioned and circumferentially rotated relatively, in the prior art, one end of the screw rod 4 is connected with the gear transmission mechanism, and the other end is a free end, the nut 5 drives the sleeve 14 to ascend and descend, the ascending and descending height is the moving length of the sleeve 14, so that the total length of the ascending and descending upright column is increased, when the sleeve 14 needs to move for a long displacement, the total length of the sleeve 14 and the screw rod 4 is long, so that the ascending and descending upright column is easily bent and damaged, and the stroke of the electric push rod is small, and by using the ascending and descending upright column in the present invention, one end of the screw rod 4 can be connected with the gear transmission mechanism, and the other end is connected with the end cover 8 to realize axial and radial positioning, so that both ends of the screw rod 4 can improve the ability of bearing axial load and radial load by positioning, thereby prevent that lead screw 4 atress from buckling, secondly, when connecting plate 1 removed the lift for lead screw 4, elevating gear's overall length can not change to when needing great lift distance, elevating gear can not lead to taking place to buckle more easily because of the overall length increases, adopts above-mentioned structure, and electric putter can realize great stroke.

Simultaneously, when the lift stand need rise to higher position, electric putter stroke among the prior art is less, need increase electric putter initial state this moment the height from ground, increase the height on table and ground promptly, it is great with ground distance when leading to the table installation, be not convenient for install and use, adopt above-mentioned device, electric putter's stroke is great, can install in the position nearer apart from ground during the table installation for it can be more convenient to go up and down table installation and use.

In order to prevent the lead screw 4 from bending and breaking or causing the abnormal movement due to the radial deviation, the lead screw 4 is preferably provided with the transmission gear, both sides of the transmission gear on the lead screw 4 are respectively provided with the end bearings 13 which are used for increasing the centripetal force of the lead screw 4 so as to enable the lead screw 4 to rotate more stably, the radial movement of one end of the lead screw 4 is limited by the two end bearings 13, and the lead screw 4 is prevented from bending and breaking or causing the abnormal movement due to the radial deviation.

In order to fix the connecting plate 1 more stably, the nut 5 is preferably sleeved with an inner tube 6 detachably connected with the nut 5, the inner tube 6 is fixedly connected with the connecting plate 1, the installation area of the inner tube 6 is large, the inner tube can be fixed with the nut 5 more stably, the connecting plate 1 can be fixed on the inner tube 6 in a welding mode, the connecting plate 1 is fixed more firmly and stably, and meanwhile, the nut 5 and the connecting plate 1 are simpler to process and install.

In order to make 1 installation of connecting plate more convenient, this embodiment is preferred be equipped with the spacing groove of 1 installation of connecting plate of being convenient for on the nut 5, be equipped with 6 slot holes of inner tube on the inner tube 6, connecting plate 1 passes 6 slot holes of inner tube insert spacing inslot realizes spacingly, and during the erection joint board 1, can pass 6 slot holes of inner tube earlier and insert the preliminary location of spacing inslot with connecting plate 1, and internal tube 6 is fixed again, then welding joint board 1 and inner tube 6 can make 1 installations of connecting plate more convenient.

In order to make the lift table whole more pleasing to the eye, this embodiment is preferred 1 vertical installation of connecting plate is in the spacing groove, be equipped with 2 slot holes of outer tube on the outer tube 2, connecting plate 1 passes 2 slot holes of outer tube link to each other with the table frame, during 1 vertical installation of connecting plate, only need set up on the wall body a vertical elongated hole can to reduce the area of aperture, prevent the wall body because the great whole aesthetic measure who influences the lift table of the area in hole, also can reduce the volume of outer tube 2, make the whole volume of lift stand can reduce, increase the aesthetic measure of lift stand, connecting plate 1 stretches out through 2 slot holes of outer tube, both can prevent stretching out of 2 restriction connecting plates of outer tube 1, can rock through the level of 2 slot hole restriction connecting plates of outer tube 1 again, guarantee the stability after 1 installation of connecting plate.

In order to prevent the connecting plate 1 from being worn when sliding, the outer tube sliding strip 7 for preventing the connecting plate 1 from being worn when sliding is arranged on the long hole of the outer tube 2, and the outer tube 2 is not moved when the connecting plate 1 slides, so that sliding friction can occur between the connecting plate 1 and the long hole of the outer tube 2, and the outer tube sliding strip 7 can prevent the connecting plate 1 from being worn when sliding.

In order to make the inner tube 6 more stable when moving, this embodiment is preferred the inner tube 6 cover is established the outer tube 2 inside and with the outer tube 2 keeps circumference relative positioning and axial relative slip, through the circumferential motion of outer tube 2 restriction inner tube 6, more stable when can making the inner tube 6 move, takes place to rock the stability that influences the lift table when preventing the motion of inner tube 6.

In order to prevent the inner tube 6 from being worn when sliding, in this embodiment, it is preferable that the outer tube 2 and the inner tube 6 are rectangular tubes, the inner tube sliding strips 22 for preventing the sliding wear of the inner tube 6 and generating noise are disposed on the four edges outside the inner tube 6, and the inner tube sliding strips 22 can reduce the wear of the inner tube 6 when sliding, so that the inner tube 6 is more stable when moving, and the service life of the inner tube 6 can be prolonged.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims

1. A linear actuator for lifting a table, comprising a motor, a screw rod, a worm wheel and a worm engaged with the worm wheel, wherein the motor comprises a motor shaft, the motor shaft is fixedly connected with the worm or is of an integrated structure, and the linear actuator is characterized in that: the linear actuator further comprises a driving shaft, a driving bevel gear and a driven bevel gear meshed with the driving bevel gear, the driving bevel gear is mounted on the driving shaft and rotates coaxially with the worm gear, the driven bevel gear is connected with the lead screw, and at least one of the driving bevel gear, the driving shaft, the motor shaft and the lead screw is provided with a self-locking device for realizing self-locking of the linear actuator.

2. A linear actuator for lifting tables as claimed in claim 1, wherein: and the driving bevel gear or the driving shaft is sleeved with a first torsion spring for realizing self-locking of the linear actuator.

3. A linear actuator for lifting tables as claimed in claim 2, wherein: the driving helical gear comprises a shoulder extending axially, the first torsion spring is sleeved outside the shoulder and is in interference fit with the surface of the shoulder, the linear actuator further comprises a gear box body, the first torsion spring comprises a first pin, and a positioning groove which is clamped with the first pin to limit the rotation of the first torsion spring is arranged on the gear box body.

4. A linear actuator for lifting tables as claimed in claim 1, wherein: and a second torsion spring for enabling the linear actuator to realize self-locking is arranged on the screw rod.

5. A linear actuator for lifting tables as claimed in claim 4, wherein: the cover is equipped with torsion spring seat and fixing base on the lead screw, torsion spring seat with lead screw circumference location, the second torsional spring cover is established outside the torsion spring seat and with torsion spring seat surface interference fit, linear actuator still includes the gearbox body, the fixing base with gearbox body fixed connection, the second torsional spring includes the second pin, be equipped with on the fixing base with second pin block is in order to restrict second torsional spring pivoted recess.

6. A linear actuator for lifting tables as claimed in claim 1, wherein: and the motor shaft is provided with a friction ring for realizing friction self-locking of the motor shaft.

7. A linear actuator for lifting tables as claimed in claim 6, wherein: the linear actuator further comprises a gear box body, the friction ring comprises a ring body and an elastic body, the ring body and the gear box body are circumferentially positioned, the elastic body is abutted to the surface of the motor shaft through elastic deformation, and the elastic body limits the rotation of the motor shaft through friction force generated by contact with the motor shaft.

8. A linear actuator for lifting tables as claimed in claim 7, wherein: and friction rings are arranged at two ends of the motor shaft.

9. A linear actuator for lifting tables according to any of claims 1 to 8, characterized in that: the front end of the worm is sleeved with a sleeve for limiting the radial movement of the worm.

10. A linear actuator for lifting tables according to any of claims 1 to 8, characterized in that: the motor shaft is parallel to the screw rod.