CN210265590U - Friction self-locking mechanism of lifting column and lifting column - Google Patents
Friction self-locking mechanism of lifting column and lifting column Download PDFInfo
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- CN210265590U CN210265590U CN201920637914.7U CN201920637914U CN210265590U CN 210265590 U CN210265590 U CN 210265590U CN 201920637914 U CN201920637914 U CN 201920637914U CN 210265590 U CN210265590 U CN 210265590U
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Abstract
The utility model relates to a friction self-locking mechanism of lift post and have this friction self-locking mechanism lift post. This friction self-locking mechanism of lift post includes friction spare and connecting piece, friction spare and connecting piece all suit are at the drive end of lift post, and rotate along with the drive end, friction spare and connecting piece are located the inside and outside both sides of drive box respectively, the drive end passes through the axial limiting displacement of friction spare and connecting piece and rotatably assembles together with the drive box of lift post, the friction spare is used in on the lateral surface of drive box, the frictional force that is used for realizing the auto-lock is provided, the connecting piece is used for being connected with the transmission in the drive box, the rotary power of transmission motor. The utility model has the advantages that: the friction self-locking mechanism has the advantages that the self-locking force is increased along with the increase of the load, the self-locking force can be improved, higher load can be borne, the self-locking force attenuation generated after multiple times of operation can be avoided, the cost is reduced, and the assembly process is simplified.
Description
Technical Field
The utility model relates to a lift post technical field, especially a friction self-locking mechanism of lift post and have this friction self-locking mechanism lift post.
Background
In the modern office environment, due to the consideration to health and comfortableness, the office table, the computer table, the conference table and the like are required to have a lifting function, office workers can adjust the height of the table top according to the height and the sitting posture of the office workers, the comfortableness is improved, or the office workers directly stand to work, and the office workers are favorable for relieving the fatigue and the strain of the neck and the waist. The desk with the adjustable height at least comprises 2 lifting columns, and in the actual use process, if the lifting columns are not provided with reliable self-locking mechanisms, the lifting columns can slowly slide downwards under the action of desktop loads to cause unbalanced inclination of the desktop and more serious collapse of the desktop, so that the improvement of the self-locking reliability becomes a technical difficulty that products must overcome at the present stage.
In chinese patent document CN100425874C an actuator, in particular a linear actuator, is disclosed comprising a reversible motor driving an adjustment member by means of a transmission. In order to increase the self-locking capacity of the actuator, the actuator is provided with a self-locking spring, one end of which is fixed to the rotating part of the actuator so that the self-locking spring is entrained in the direction of rotation on the cylindrical part, where it is in a relatively stationary state. When the motor is switched off, the load on the actuator tries to move the adjustment member and the movement of the self-locking spring is prevented, whereby the self-locking spring tightens around the cylindrical part.
The common self-locking spring with the structure can only provide smaller torque to compensate smaller self-locking force, can only relieve the shortage of the self-locking force but can not eliminate the hidden trouble caused by the shortage of the self-locking force, has high processing precision requirement and relatively complex installation process, and can generate self-locking force attenuation after the self-locking spring operates for many times, so that the self-locking force is greatly reduced, and the reliability of the lifting column is poor.
Chinese patent document CN108466994A discloses a transmission device and a lifting column, wherein the lifting column of the patent document provides an extra self-locking force and improves the braking effect by additionally adding a braking torsion spring on the basis of a braking torsion spring. But still can not avoid the technical problem that the self-locking spring can produce the decay of self-locking force after many times of operation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: simplify self-locking mechanism, avoid the problem of auto-lock inefficacy.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a friction self-locking mechanism of lift post, including friction spare and connecting piece, friction spare and connecting piece all suit are at the lead screw drive arrangement's of lift post drive end, and rotate along with the drive end is synchronous, friction spare and connecting piece are located the inside and outside both sides of drive box respectively, the drive end passes through the axial limiting displacement of friction spare and connecting piece and rotatably assembles with the drive box of lift post together, the friction spare is used in on the lateral surface of drive box, the frictional force that is used for realizing the auto-lock is provided, the connecting piece is used for being connected with the transmission in the drive box, the rotatory power to drive end transmission motor.
Further, the connecting member may transmit the rotational power of the motor to the driving end in two specific forms, respectively: a transmission structure is arranged between the connecting piece and the friction piece, and the connecting piece transmits the rotary power of the motor to the driving end through the friction piece; or a transmission structure is arranged between the connecting piece and the driving end, and the connecting piece directly transmits the rotary power of the motor to the driving end.
Further limiting, the driving box structure between the friction piece and the connecting piece is a driving box body of the driving box; alternatively, the driving case structure between the friction member and the connecting member is an assembling shutter assembled to the driving case body by a fastening member.
Further inject, the upper end of friction piece has the transmission hole, and the connecting piece lower extreme has downwardly extending's transmission portion, and transmission portion passes the drive box and inserts the transmission hole, and transmission portion and transmission hole pass through spline structure cooperation transmission, constitute the transmission structure between connecting piece and the friction piece, make the connecting piece pass through the friction piece to the rotatory power of drive end transmission motor.
Further, the friction piece is sleeved on the driving end in a sliding mode through a spline structure and is restrained at the lowest position, axially sliding on the driving end, of the friction piece through a limiting structure, or the friction piece is sleeved on the driving end and is fixed with the driving end, and therefore the friction piece can synchronously rotate along with the driving end.
Further limit, the transmission part is an upper section of a shaft section which passes through a screw rod shaft hole of the driving box and a lower section of a spline section which is inserted into the transmission hole.
Further, the upper end of the connecting piece is provided with a driving claw, and the connecting piece is connected with a driving device in the driving box through the driving claw.
It is further defined that the coupling is mounted on the drive end by means of a nut screwed onto the drive end, and that an elastic element is arranged between the nut and the coupling for compensating for the play between the shafts.
Further defined, the resilient member is a wave washer.
Further, the connecting piece is provided with a counter bore extending from top to bottom, and the nut and the elastic piece are assembled with the driving end in the counter bore.
Further defined, the lower end face of the connecting piece is contacted with the driving box through a convex structure.
Further limit, the driving end of the screw rod driving device is the end part of the screw rod, and the screw is driven to lift through the rotation of the screw rod.
Further, a shock absorption pad is padded below the friction piece and used for absorbing shock between the friction piece and the screw nut.
More specifically, the end face of the screw thread of the screw rod is used as a limiting structure and is used for limiting the lowest position of the friction piece axially sliding on the driving end, a gasket is padded between the friction piece and the end face of the screw thread, the shock absorption pad is located below the gasket, and a counter bore for accommodating part of the shock absorption pad is further arranged on the screw nut.
A lifting column comprises a driving box, a screw rod driving device and a column tube, wherein the driving box is fixed at the upper end of the column tube, the screw rod driving device is positioned in the column tube, a motor in the driving box drives the screw rod driving device to stretch through a transmission device, the column tube is driven to stretch through the screw rod driving device, and the driving end of the screw rod driving device is provided with the friction self-locking mechanism.
Further inject, transmission in the drive box is including installing the worm wheel on the bracket of motor, and the worm drive worm wheel on the output shaft of motor is rotatory, and the tip of worm wheel has the shrinkage pool of built-in driving pawl, and in the shrinkage pool of connecting piece's driving pawl inserted the shrinkage pool of worm wheel, with the driving pawl drive cooperation of worm wheel, it has the shock pad to inlay between the driving pawl of connecting piece and the driving pawl of worm wheel.
The utility model has the advantages that: compared with the prior art adopting a self-locking spring, the self-locking force of the friction self-locking mechanism can be improved along with the increase of the load, higher load can be borne, the self-locking force attenuation can not be generated after multiple operations, and meanwhile, the assembly of the screw rod and the driving box by adopting a bearing structure is cancelled in the existing structure, so that the cost is reduced, and the assembly process is simplified.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is an assembly structure diagram of a friction self-locking mechanism according to embodiment 1 of the present invention.
Fig. 2 is an exploded view of a friction self-locking mechanism according to embodiment 1 of the present invention.
Fig. 3 is a sectional view of a friction self-locking mechanism according to embodiment 1 of the present invention.
Fig. 4 is an exploded view of the friction self-locking mechanism and the inner part of the drive case according to embodiment 1 of the present invention.
Fig. 5 is an exploded view of the connecting member and the worm wheel of the motor according to embodiment 1 of the present invention.
Fig. 6 is a sectional view of a lifting column according to embodiment 1 of the present invention.
Fig. 7 is a sectional view showing an assembling relationship between the friction self-lock mechanism and the drive case according to embodiment 2 of the present invention.
Fig. 8 is an exploded view of an assembly relationship between the friction self-locking mechanism and the drive case according to embodiment 2 of the present invention.
In the figure, 1, a friction piece, 1-1, a transmission hole, 2, a connecting piece, 2-1, a transmission part, 2-1-1, a shaft section, 2-1-2, a spline section, 3, a screw rod, 4, a driving box, 5, an assembling baffle, 6, a transmission claw, 7, a nut, 8, a waveform gasket, 9, a gasket, 10, a bulge structure, 11, a screw rod driving device, 12, a damping pad, 13, a screw nut, 14, a motor and 15, a worm wheel are arranged.
Detailed Description
As shown in fig. 1, 2, 3, 4, 5 and 6, a lifting column, which is generally used as a table leg of an office table, a computer table or a conference table to realize the lifting function of a table top, includes a driving box 4, a lead screw driving device 11 and a column tube, the driving box 4 is fixed at the upper end of the column tube, the lead screw driving device 11 is located in the column tube, a motor 14 in the driving box 4 drives the lead screw driving device 11 to extend and retract through a transmission device, and then the column tube is driven to extend and retract by the lead screw driving device 11, a friction self-locking mechanism is provided at the driving end of the lead screw driving device 11, and when the lead screw driving device 11 adopts a form that a lead screw 13 is driven by the rotation of the lead screw 3 to lift, the driving end of the lead screw driving.
The friction self-locking mechanism of the lifting column comprises a friction piece 1 and a connecting piece 2, the friction piece 1 and the connecting piece 2 are sleeved at the end part of a screw rod 3 of the lifting column and rotate together with the screw rod 3, the friction piece 1 and the connecting piece 2 are respectively positioned at the inner side and the outer side of a driving box 4, the end part of the screw rod 3 is rotatably assembled with the driving box 4 of the lifting column through the axial limiting effect of the friction piece 1 and the connecting piece 2, the friction piece 1 is acted on the outer side surface of the driving box 4 and provides friction force for realizing self-locking, the connecting piece 2 is used for being connected with a transmission device in the driving box 4, a transmission structure is arranged between the connecting piece 2 and the friction piece 1, and the connecting piece 2 transmits the rotary power of a motor 14 to the.
The driving box structure between the friction member 1 and the connecting member 2 is an assembly baffle 5 assembled on the driving box body by a fastener, i.e. the driving box comprises the driving box body and the assembly baffle 5 assembled on the driving box body by the fastener. The assembly baffle 5 is provided with a screw rod shaft hole which penetrates through the screw rod 3.
The friction piece 1 is slidably sleeved on the screw rod 3 through the spline structure and is restrained at the axially sliding lowest position on the screw rod 3 through the limiting structure, the limiting structure is provided with a terminal surface which is a screw rod thread on the screw rod in the embodiment, a gasket 9 is arranged below the friction piece 1 in a cushioning mode, and the gasket is located between the friction piece 1 and the terminal surface of the screw rod thread and used for guaranteeing the limiting effect.
The upper end of the friction piece 1 is provided with a transmission hole 1-1, the lower end of the connecting piece 2 is provided with a transmission part 2-1 extending downwards, the transmission part 2-1 penetrates through the driving box 4 and is inserted into the transmission hole 1-1, and the transmission part 2-1 and the transmission hole 1-1 are in matched transmission through a spline structure to form a transmission structure between the connecting piece 2 and the friction piece 1.
The transmission part 2-1 is divided into an upper section of a shaft section 2-1-1 which passes through a screw rod shaft hole of the driving box 4 and a lower section of a spline section 2-1-2 which is inserted into the transmission hole 1-1.
The upper end of the connecting piece 2 is provided with a driving claw 6, and the connecting piece 2 is connected with a driving device in the driving box 4 through the driving claw 6.
The connecting piece 2 is assembled on the screw rod 3 through a nut 7 screwed on the screw rod 3, and an elastic piece is arranged between the nut 7 and the connecting piece 2 and used for compensating the clearance between shafts. The resilient member is a wave washer 8. The connecting piece 2 is provided with a counter bore extending from top to bottom, and the nut 7 and the elastic piece are assembled with the screw rod 3 in the counter bore.
The lower end face of the connecting member 2 is in contact with the fitting fence 5 of the drive case 4 through the boss structure 10.
The motor 14 and the transmission device are arranged in the driving box 4 of the lifting column, the transmission device comprises a worm wheel 15 installed on a bracket of the motor 14, a worm on an output shaft of the motor 14 drives the worm wheel 15 to rotate, a concave hole with a built-in transmission claw 6 is formed in the end part of the worm wheel 15, the transmission claw 6 of the connecting piece 2 is inserted into the concave hole of the worm wheel 15 and is in driving fit with the transmission claw 6 of the worm wheel 15, and a damping pad 12 is embedded between the transmission claw 6 of the connecting piece 2 and the transmission claw 6 of the worm wheel 15. The number of the driving claws 6 of the link 2 and the driving claws 6 of the worm wheel 15 is specifically three.
The connecting piece 2 and the friction plate 1 are made of polyformaldehyde.
The working principle of the friction self-locking device is explained by the following description:
The load that the lift post bore mainly is gravity, acts on between friction spare 1 and the assembly baffle 5, and the load that the lift post received is big more, and contact pressure is big more between friction spare 1 and the assembly baffle 5, and frictional force is also big more, provides bigger self-locking power, can not have traditional auto-lock spring and can produce the decay of self-locking power after the multiple operation to the self-locking power descends by a wide margin, leads to the problem of the reliability variation of lift post.
The contact pressure between the connecting piece 2 and the assembling baffle 5 is mainly generated by the waveform gasket 8, the contact pressure is relatively small, meanwhile, the connecting piece 2 is in contact with the assembling baffle 5 through the convex structure 10, the friction force is relatively small, the connecting piece 2 is not easy to wear relative to the friction piece 1, only small self-locking force is provided, and the self-locking force of the lifting column mainly comes from the friction piece 1.
The utility model discloses want to cancel the assembly that adopts bearing arrangement to carry out lead screw 3 and drive box 4 than prior art, the cost is reduced has simplified assembly process.
The above embodiments are made on the basis of the inventive idea of the present invention, and belong to the protection scope of the present invention, and there are other embodiments under the inventive idea.
Example 2, compared to example 1, differs in that: the connecting piece 2 directly transmits the rotating power of the motor 14 to the screw rod 3, and specifically, the connecting piece 2 and the screw rod 3 are in transmission fit through an internal spline and an external spline.
Example 3, the design of assembling the baffle 5 in example 1 is for the convenience of assembly, and does not exclude the following embodiments, the difference compared to example 1 being: the assembly baffle 5 is removed, a screw rod shaft hole is directly formed in the driving box body, and the driving box structure between the friction piece 1 and the connecting piece 2 is the driving box body of the driving box 4, as shown in figures 7 and 8.
Example 4, compared to example 1, differs in that: the friction piece 1 is sleeved on the screw rod 3 and directly fixed on the screw rod 3 through a fastener, or the friction piece 1 is directly fixed on the screw rod 3 through injection molding, so that the friction piece 1 is fixed with the screw rod 3 without being excluded, and the friction piece 1 is a part of the screw rod 3 and is processed through a machining mode.
Claims (16)
1. A friction self-locking mechanism of a lifting column is characterized in that: comprises a friction piece (1) and a connecting piece (2),
the friction piece (1) and the connecting piece (2) are sleeved at the driving end of the screw rod driving device (11) of the lifting column and synchronously rotate along with the driving end, the friction piece (1) and the connecting piece (2) are respectively positioned at the inner side and the outer side of the driving box (4), the driving end is rotatably assembled with the driving box (4) of the lifting column through the axial limiting effect of the friction piece (1) and the connecting piece (2),
the friction piece (1) acts on the outer side surface of the driving box (4) and provides friction force for realizing self-locking,
the connecting piece (2) is used for being connected with a transmission device in the driving box (4) and transmitting the rotating power of the motor (14) to the driving end.
2. A friction self-locking mechanism for a lifting column according to claim 1, wherein: a transmission structure is arranged between the connecting piece (2) and the friction piece (1), and the connecting piece (2) transmits the rotary power of the motor (14) to the driving end through the friction piece (1);
or a transmission structure is arranged between the connecting piece (2) and the driving end, and the connecting piece directly transmits the rotary power of the motor (14) to the driving end.
3. A friction self-locking mechanism for a lifting column according to claim 1, wherein: the driving box between the friction piece (1) and the connecting piece (2) is a driving box body of the driving box (4); or the driving box structure between the friction piece (1) and the connecting piece (2) is an assembling baffle (5) assembled on the driving box body through a fastening piece.
4. A friction self-locking mechanism for a lifting column according to claim 1, wherein: the upper end of the friction piece (1) is provided with a transmission hole (1-1), the lower end of the connecting piece (2) is provided with a transmission part (2-1) extending downwards, the transmission part (2-1) penetrates through the driving box (4) and is inserted into the transmission hole (1-1), the transmission part (2-1) and the transmission hole (1-1) are in matched transmission through a spline structure to form a transmission structure between the connecting piece (2) and the friction piece (1), and the connecting piece (2) is enabled to transmit the rotating power of the motor (14) to the driving end through the friction piece (1).
5. A friction self-locking mechanism of a lifting column according to claim 1 or 4, characterized in that: the friction piece (1) can be slidably sleeved on the driving end through a spline structure and is constrained at the lowest position of the driving end, which axially slides, by a limiting structure, or the friction piece (1) is sleeved on the driving end and is fixed with the driving end, so that the friction piece (1) synchronously rotates along with the driving end.
6. A friction self-locking mechanism for a lifting column according to claim 4, wherein: the transmission part (2-1) is divided into an upper section of a shaft section (2-1-1) which penetrates through a screw rod shaft hole of the driving box (4) and a lower section of a spline section (2-1-2) which is inserted into the transmission hole (1-1).
7. A friction self-locking mechanism for a lifting column according to claim 1, wherein: the upper end of the connecting piece (2) is provided with a transmission claw (6), and the connecting piece (2) is connected with a transmission device in the driving box (4) through the transmission claw (6).
8. A friction self-locking mechanism for a lifting column according to claim 1, wherein: the connecting piece (2) is arranged on the driving end through a nut (7) screwed on the driving end, and an elastic piece is further arranged between the nut (7) and the connecting piece (2) and used for compensating the clearance between the shafts.
9. A friction self-locking mechanism for a lifting column according to claim 8, wherein: the elastic piece is a wave-shaped gasket (8).
10. A friction self-locking mechanism for a lifting column according to claim 8, wherein: the connecting piece (2) is provided with a counter bore extending from top to bottom, and the nut (7) and the elastic piece are assembled with the driving end in the counter bore.
11. A friction self-locking mechanism for a lifting column according to claim 1, wherein: the lower end face of the connecting piece (2) is contacted with the driving box (4) through a convex structure (10).
12. A friction self-locking mechanism for a lifting column according to claim 1, 2, 3, 4, 6, 7, 8, 9, 10 or 11, wherein: the driving end of the screw rod driving device (11) is the end part of the screw rod (3), and the screw nut (13) is driven to lift through the rotation of the screw rod (3).
13. A friction self-locking mechanism for a lifting column according to claim 12, wherein: the lower part of the friction piece (1) is padded with a damping pad (12) which is used for damping between the friction piece (1) and the screw nut (13).
14. A friction self-locking mechanism for a lifting column according to claim 13, wherein: the end face of the screw thread of the screw rod (3) is used as a limiting structure for limiting the lowest position of the friction piece (1) which axially slides on the driving end, a gasket (9) is padded between the friction piece (1) and the end face of the screw thread,
the shock absorption pad (12) is positioned below the gasket, and the nut (13) is also provided with a counter bore for accommodating part of the shock absorption pad (12).
15. The utility model provides a lifting column, includes drive box (4), lead screw drive arrangement (11) and column casing, and drive box (4) are fixed in the upper end of column casing, and lead screw drive arrangement (11) are arranged in the column casing, and motor (14) in drive box (4) are flexible through transmission drive lead screw drive arrangement (11), and it is flexible, characterized by to drive the column casing by lead screw drive arrangement (11) again: at the drive end of the spindle drive (11) there is a friction self-locking mechanism as claimed in claim 1, 2, 3, 4, 6, 7, 8, 9, 10 or 11.
16. The lifting column of claim 15, wherein: drive arrangement in box (4) including installing worm wheel (15) on the bracket of motor (14), worm drive worm wheel (15) on the output shaft of motor (14) are rotatory, the tip of worm wheel (15) has the shrinkage pool of built-in driving pawl (6), driving pawl (6) of connecting piece (2) insert in the shrinkage pool of worm wheel (15), with driving pawl (6) drive cooperation of worm wheel (15), driving pawl (6) and the driving pawl (6) of worm wheel (15) between connecting piece (2) have inlayed shock pad (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920637914.7U CN210265590U (en) | 2019-05-06 | 2019-05-06 | Friction self-locking mechanism of lifting column and lifting column |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920637914.7U CN210265590U (en) | 2019-05-06 | 2019-05-06 | Friction self-locking mechanism of lifting column and lifting column |
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| CN210265590U true CN210265590U (en) | 2020-04-07 |
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| CN201920637914.7U Active CN210265590U (en) | 2019-05-06 | 2019-05-06 | Friction self-locking mechanism of lifting column and lifting column |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107620A (en) * | 2019-05-06 | 2019-08-09 | 常州市凯迪电器股份有限公司 | The friction self-locking mechanism and lifting column of lifting column |
| WO2023217306A3 (en) * | 2022-05-11 | 2024-01-04 | 常州市凯迪电器股份有限公司 | Brake mechanism, and lifting column using brake mechanism |
-
2019
- 2019-05-06 CN CN201920637914.7U patent/CN210265590U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107620A (en) * | 2019-05-06 | 2019-08-09 | 常州市凯迪电器股份有限公司 | The friction self-locking mechanism and lifting column of lifting column |
| CN110107620B (en) * | 2019-05-06 | 2024-06-11 | 常州市凯迪电器股份有限公司 | Friction self-locking mechanism of lifting column and lifting column |
| WO2023217306A3 (en) * | 2022-05-11 | 2024-01-04 | 常州市凯迪电器股份有限公司 | Brake mechanism, and lifting column using brake mechanism |
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