CN220369663U - Linear actuator of lifting table upright post - Google Patents
Linear actuator of lifting table upright post Download PDFInfo
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- CN220369663U CN220369663U CN202321417026.7U CN202321417026U CN220369663U CN 220369663 U CN220369663 U CN 220369663U CN 202321417026 U CN202321417026 U CN 202321417026U CN 220369663 U CN220369663 U CN 220369663U
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- 230000008859 change Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
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Abstract
The utility model provides a linear actuator of a lifting table upright post, which comprises a screw rod, a rotating shaft bearing, a bearing seat, a braking piece and a clutch component, wherein the screw rod can rotate relative to the bearing seat through the rotating bearing; when the braking piece rotates together with the screw rod, the braking piece is abutted with the bearing seat along the axial direction of the screw rod, the size of the load can influence the size of positive pressure between the braking piece and the bearing seat, so that the friction force between the braking piece and the bearing seat is positively correlated with the load of the lifting table, and when the load of the lifting table is larger, the friction force between the braking piece and the supporting seat is larger, and the provided self-locking force is larger.
Description
Technical Field
The utility model relates to the field of furniture, in particular to a linear actuator of a lifting table upright post.
Background
As the idea of healthy office is proposed, the lifting table presents a popular trend; the lifting table can change a person who works on a table for a long time into standing-posture office when the person feel tired due to sitting for a long time, so that the fatigue is relieved, and the health problems in the aspects of waist and back of the spine and the like caused by long-time office can be prevented; in the production of lift tables, the focus is on the lift columns, while the focus in the lift columns is on the linear actuators that drive them up and down.
The cost of the actuator in the lifting upright post on the market is higher, the structure is complex, the lifting and the lowering are two different conditions for the actuator, the linear actuator serving as a driving piece is required to always resist the load due to gravity, smaller internal resistance is required when the linear actuator rises, more driving force is required to resist the load and lift the lifting table, larger internal resistance is required when the linear actuator descends, the load is supported, the reverse driving force is prevented from causing too fast descent, the too fast descent has potential safety hazard, and the linear actuator also requires larger internal resistance to resist the load and keeps stable when the linear actuator stops; this internal resistance is generally referred to as self-locking force, and is often the case for a highly loaded lift table.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a linear actuator of a lifting table upright post, which comprises a screw rod, a rotating shaft bearing, a bearing seat, a braking piece and a clutch component, wherein the screw rod can rotate relative to the bearing seat by the rotating bearing, the clutch component is arranged between the braking piece and the screw rod to enable the braking piece to rotate selectively with the screw rod, the clutch component comprises a spring seat and a torsion spring, the spring seat rotates along with the screw rod, and the torsion spring contracts or expands in different rotation directions of the screw rod, so that the rotation of the braking piece is controlled; when the braking piece rotates together with the screw rod, the braking piece is abutted with the bearing seat along the axial direction of the screw rod, the size of the load can influence the size of positive pressure between the braking piece and the bearing seat, so that the friction force between the braking piece and the bearing seat is positively correlated with the load of the lifting table, and when the load of the lifting table is larger, the friction force between the braking piece and the supporting seat is larger, and the provided self-locking force is larger.
The technical scheme of the utility model is realized as follows:
a linear actuator for lifting a table post, comprising:
a screw rod;
a rotating bearing sleeved at the upper end part of the screw rod;
the bearing seat keeps circumferential static, the screw rod is inserted into the bearing seat, and the rotating bearing is arranged on the bearing seat;
the braking piece selectively rotates synchronously with the screw rod, and the braking piece is abutted with the bearing seat along the axial direction of the screw rod;
the clutch component is arranged between the screw rod and the braking piece and used for controlling the linkage relation between the screw rod and the braking piece, and comprises a spring seat fixed with the screw rod in the circumferential direction and a torsion spring arranged on the spring seat; the torsion spring comprises a torsion arm which is inserted into the braking piece; when the clutch component is configured to rotate forward, the torsion spring radially expands, the clutch component breaks the linkage between the screw and the brake piece, and the screw and the spring seat rotate relative to the bearing seat; when the screw rod rotates reversely, the torsion spring radially contracts and rotates along with the screw rod and the spring seat, and meanwhile, the braking piece is driven to rotate relative to the bearing seat, and friction is generated between the braking piece and the bearing seat.
The braking piece is abutted with the bearing seat along the axial direction of the screw rod, and the magnitude of the load can influence the magnitude of positive pressure between the braking piece and the bearing seat, so that the friction force between the braking piece and the bearing seat is positively related to the load of the lifting table, and when the load of the lifting table is larger, the friction force between the braking piece and the supporting seat is larger, and the provided self-locking force is larger; according to the rotation direction of the torsion spring, the movement condition of the clutch assembly during forward and reverse rotation of the screw rod is influenced, and the integral self-locking condition is further influenced; when the screw rod rotates positively, namely when the lifting table ascends, the torsion spring expands radially, the clutch component breaks the linkage between the screw rod and the brake piece, and only the screw rod and the spring seat on the screw rod rotate; when the screw rod rotates reversely, namely, when the screw rod is lifted and lowered, the torsion spring radially contracts and rotates along with the screw rod and the spring seat, and meanwhile, the braking piece is driven to rotate, at the moment, the friction force generated between the braking piece and the bearing seat provides self-locking force, and the torsion spring tightly holds the spring seat and also provides self-locking force; when the lifting table is kept at the height of the lifting table, the load causes the screw rod to reversely rotate, and the static friction between the braking piece and the bearing seat and the torsional spring holding spring seat can also provide self-locking force.
Preferably, a friction piece is further arranged between the brake piece and the bearing seat, an inner friction surface is arranged on the friction piece, an outer friction surface is arranged at the upper end of the brake piece, the upper end of the brake piece enters the friction piece, and the inner friction surface is abutted against the outer friction surface. The friction coefficient is increased by the abutment of the two friction surfaces.
Preferably, the friction member is annular and is embedded in the bearing housing and faces the brake member. The friction piece can avoid the screw rod, and simultaneously the circumferential contact area is larger, so that the inner friction surface and the outer friction surface fully play a role.
Preferably, the friction member is a plastic member. The friction piece is a plastic piece, the friction coefficient is high, and the braking piece can be made of metal with higher strength on the premise of adopting the material.
Preferably, the upper end part of the braking piece is radially reduced from bottom to top and is arranged between the bearing seats; the braking piece is a plastic piece. The brake piece enters between the bearing seats to be in friction contact with the bearing seats, and the upper end part of the brake piece is reduced from bottom to top in the radial direction, so that the positioning can be realized, and the two parts can be matched more tightly; the friction coefficient of the plastic brake is higher.
Preferably, the inner friction surface and the outer friction surface are conical surfaces. The conical surface is inclined, so that the installation and positioning of the braking piece and the bearing seat can be assisted, and the load change can be embodied on the forward pressure of the two friction surfaces, so that the self-locking force is automatically increased under the condition of high load.
Preferably, a thrust bearing is further arranged on the screw rod, one end of the thrust bearing is in interference fit with the screw rod, and the other end of the thrust bearing is in interference fit with the brake piece. The thrust bearing enables the screw rod and the braking piece to rotate relatively, and meanwhile, the braking piece can keep the axial position of the braking piece relative to the screw rod, and when the lifting table is subjected to a large load, the braking piece cannot move, so that the self-locking force is ensured to be provided stably.
Preferably, the brake piece is provided with a containing groove from bottom to top, and the spring seat is positioned in the containing groove; the braking piece is also provided with a clamping groove which is communicated with the accommodating groove, and the torsion arm of the torsion spring is inserted into the clamping groove. The spring seat and the torsion spring are used as a clutch assembly and are required to be connected with the screw rod and the brake piece, the brake piece is provided with a containing groove for enabling the brake piece and the clutch assembly to be overlapped in the axial direction of the screw rod, and the torsion arm of the torsion spring is inserted into the clamping groove to achieve connection.
Preferably, the clutch mechanism has two spring seats which are overlapped up and down along the axial direction of the screw rod. The clutch effect achieved by the two clutch mechanisms is almost similar, but the self-locking force of the clutch mechanisms to the screw rod can be increased.
The design starting point, the idea and the beneficial effects of the utility model adopting the technical scheme are as follows:
the braking piece is abutted with the bearing seat along the axial direction of the screw rod, and the magnitude of the load can influence the magnitude of positive pressure between the braking piece and the bearing seat, so that the friction force between the braking piece and the bearing seat is positively related to the load of the lifting table, and when the load of the lifting table is larger, the friction force between the braking piece and the supporting seat is larger, and the provided self-locking force is larger; according to the rotation direction of the torsion spring, the movement condition of the clutch assembly during forward and reverse rotation of the screw rod is influenced, and the integral self-locking condition is further influenced; when the screw rod rotates positively, namely when the lifting table ascends, the torsion spring expands radially, the clutch component breaks the linkage between the screw rod and the brake piece, and only the screw rod and the spring seat on the screw rod rotate; when the screw rod rotates reversely, namely, when the screw rod is lifted and lowered, the torsion spring radially contracts and rotates along with the screw rod and the spring seat, and meanwhile, the braking piece is driven to rotate, at the moment, the friction force generated between the braking piece and the bearing seat provides self-locking force, and the torsion spring tightly holds the spring seat and also provides self-locking force; when the lifting table is kept at the height of the lifting table, the load causes the screw rod to reversely rotate, and the static friction between the braking piece and the bearing seat and the torsional spring holding spring seat can also provide self-locking force.
Drawings
Fig. 1 is a schematic perspective view showing the structure in which the linear actuator is provided in a column in embodiment 1 of the present utility model;
fig. 2 is a side view of the linear actuator of the present utility model in embodiment 1 when installed;
fig. 3 is an exploded view of the linear actuator in embodiment 1 of the present utility model;
fig. 4 is a schematic perspective view of a brake member according to embodiment 1 of the present utility model;
FIG. 5 is a cross-sectional view of the brake member in embodiment 1 of the present utility model;
fig. 6 is a sectional view of the linear actuator in embodiment 1 of the present utility model;
fig. 7 is a sectional view of the linear actuator in embodiment 2 of the present utility model.
The reference numerals are as follows: a screw 1; a rotating bearing 2; a bearing seat 3; an extension 31; a mounting groove 32; a main body 33; a receiving groove 34; a circular groove 35; a card slot 36; a brake 4; a spring seat 5; a torsion spring 6; torsion arm 61; a motor case 7; a friction member 8; an outer friction surface 9; an inner friction surface 10; thrust bearings 11.
Description of the embodiments
In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.
In the description of the present utility model, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The specific embodiments of the present utility model are as follows:
examples
As shown in fig. 1-3, the present utility model provides a linear actuator for lifting a table post, comprising:
a screw 1;
a rotating bearing 2 sleeved at the upper end part of the screw rod 1;
a bearing seat 3 which keeps circumferential static, a screw rod 1 is inserted into the bearing seat 3, and a rotating bearing 2 is arranged on the bearing seat 3;
the brake piece 4 selectively rotates synchronously with the screw rod 1, and the brake piece 4 is abutted with the bearing seat 3 along the axial direction of the screw rod 1;
the clutch component is arranged between the screw rod 1 and the braking piece 4 and used for controlling the linkage relation between the screw rod 1 and the braking piece 4, and comprises a spring seat 5 fixed with the screw rod 1 in the circumferential direction and a torsion spring 6 arranged on the spring seat 5; the torsion spring 6 includes a torsion arm 61, the torsion arm 61 being inserted into the braking member 4; when the clutch component is configured to enable the screw rod 1 to rotate positively, the torsion spring 6 expands radially, the clutch component breaks the linkage between the screw rod 1 and the brake piece 4, and the screw rod 1 and the spring seat 5 rotate relative to the bearing seat 3; when the screw rod 1 rotates reversely, the torsion spring 6 radially contracts and rotates along with the screw rod 1 and the spring seat 5, and meanwhile, the brake piece 4 is driven to rotate relative to the bearing seat 3, and friction is generated between the brake piece and the bearing seat.
The braking piece 4 is abutted with the bearing seat 3 along the axial direction of the screw rod 1, and the magnitude of the load can influence the magnitude of positive pressure between the braking piece 4 and the bearing seat, so that the friction force between the braking piece 4 and the bearing seat is positively related to the load of the lifting table, and when the load of the lifting table is larger, the friction force between the braking piece 4 and the supporting seat is larger, and the provided self-locking force is larger; according to the rotation direction of the torsion spring 6, the motion condition of the clutch assembly during forward and reverse rotation of the screw rod 1 is influenced, and the integral self-locking condition is further influenced; when the screw rod 1 rotates positively, namely when the lifting table ascends, the torsion spring 6 expands radially, the clutch component breaks the linkage between the screw rod 1 and the brake piece 4, and only the screw rod 1 and the spring seat 5 thereon rotate; when the screw rod 1 rotates reversely, namely, rises and falls, the torsion spring 6 radially contracts and rotates along with the screw rod 1 and the spring seat 5, and meanwhile, the braking piece 4 is driven to rotate, at the moment, the friction force generated between the braking piece 4 and the bearing seat 3 provides self-locking force, and the torsion spring 6 tightly holds the spring seat 5 and also provides self-locking force; when the lifting table is kept at its height, the load causes a tendency for the screw 1 to reverse, the static friction between the braking member 4 and the bearing housing 3 and the torsion spring 6 holding the spring seat 5 also provide a self-locking force.
Specifically, the shaft head at the upper end of the screw rod 1 is connected with a motor for driving the screw rod to rotate, the bearing seat 3 is fixedly connected to the motor box 7, the screw rod 1 is installed on the bearing seat 3 through the rotary bearing 2 and is arranged in a rotating way relative to the bearing seat 3, the bearing seat 3 is downwards extended to form an extension part 31 protruding out of the motor box 7, the extension part 31 is in a coaming shape, an installation groove 32 is formed in the middle of the extension part 31, a friction piece 8 is installed in the installation groove 32, the friction piece 8 is annular, and the middle of the friction piece is hollow to avoid the screw rod 1; the lower part of the friction piece 8 is provided with a brake piece 4 arranged on the screw rod 1, the brake piece 4 is abutted with the friction piece 8, and the friction piece 8 is a plastic piece and is in friction fit with the brake piece 4 so as to improve the friction coefficient and further increase the self-locking force of the linear actuator; further, the upper end of the braking piece 4 is radially reduced from bottom to top, the upper end of the braking piece 4 is arranged in the friction piece 8, an outer friction surface 9 is formed at the upper end of the braking piece 4, a downward inner friction surface 10 is correspondingly arranged on the friction piece 8, and after the upper end of the braking piece 4 enters the friction piece 8, the inner friction surface 10 is abutted with the outer friction surface 9 so as to increase the friction coefficient; in this case, the brake 4 can be made of a stronger metal, which increases the service life of the linear brake.
Further, the inner friction surface 10 and the outer friction surface 9 are conical surfaces, and the conical surfaces are inclined, so that the installation and positioning of the brake piece 4 and the bearing seat 3 can be assisted, and the load change can be caused to be reflected on the forward pressure of the two friction surfaces, so that the self-locking force is automatically increased under the condition of high load.
As shown in fig. 4 and 5, the brake member 4 is in a sleeve shape, the upper end of the brake member 4 is in a circular truncated cone shape, the main body 33 of the brake member 4 is in a cylinder, the main body 33 of the brake member 4 is concavely formed with a containing groove 34 from bottom to top, a circular groove 35 is also formed in the upper end of the brake member 4, the circular groove 35 is communicated with the containing groove 34, a thrust bearing 11 is arranged in the circular groove 35, the thrust bearing 11 is sleeved on the screw rod 1, one end of the thrust bearing 11 is in interference fit with the screw rod 1, the other end of the thrust bearing is in interference fit with the brake member 4, the thrust bearing 11 enables the screw rod 1 and the brake member 4 to rotate relatively, and meanwhile, the brake member 4 can keep the axial position relative to the screw rod 1, and can not move when being subjected to a large load of a lifting table, so that the stable self-locking force is ensured.
As shown in fig. 6, the torsion spring 6 is sleeved on the spring seat 5, the spring seat 5 is located in the accommodating groove 34, a clamping groove 36 which is opened downwards and vertical is further formed in the wall of the main body part 33, the clamping groove 36 is communicated with the accommodating groove 34, a torsion arm 61 of the torsion spring 6 is inserted into the clamping groove 36, the spring seat 5 and the torsion spring 6 are used as a clutch component and are required to be connected with the screw rod 1 and the brake piece 4, the accommodating groove 34 is formed in the brake piece 4 so that the brake piece 4 and the clutch component are overlapped in the axial direction of the screw rod 1, and then the torsion arm 61 of the torsion spring 6 is inserted into the clamping groove 36 to realize connection; the clutch mechanism is provided with two spring seats 5 which are overlapped up and down along the axial direction of the screw rod 1. The clutch effect achieved by the two clutch mechanisms is almost similar, but the self-locking force of the clutch mechanisms to the screw rod 1 can be increased.
Compared with the common actuators in the market, the lifting column is simple and clear in structure, meanwhile, the cost is reduced, and the self-locking capacity of the lifting column is improved by adopting the torsion spring clutch and the double braking of the friction ring and the friction plate. In the rising process of the upright post, the screw rod 1 idles in the friction plate, at the moment, the friction plate, the ring and the torsion spring clutch do not generate braking effect, and in the falling process of the upright post, the friction plate, the friction ring and the torsion spring clutch generate braking effect, so that the self-locking force on a heavy load is enhanced, and the service lives of the torsion spring 6, the spring seat 5, the friction ring and the like are prolonged.
Example 2: the present embodiment differs from embodiment 1 in that the friction member 8 is eliminated and the bearing housing 3 is brought into direct contact with the braking member 4, and the braking member 4 is a plastic member to increase the friction coefficient, specifically:
as shown in fig. 7, the bearing seat 3 extends downwards to form an extension part 31, the extension part 31 is reduced from bottom to top along the radial inward and is matched with the upper end part of the brake piece 4, so that an inner friction surface 10 corresponding to the outer friction surface 9 is formed, the brake piece 4 is abutted with the outer friction surface 9 through the inner friction surface 10, the upper end part of the brake piece 4 is reduced from bottom to top along the radial direction, and the upper end part of the brake piece 4 is arranged between the bearing seats 3; the braking member 4 is a plastic member. The brake piece 4 enters between the bearing seats 3 to be in friction contact with the bearing seats 3, and the upper end part of the brake piece 4 is radially reduced from bottom to top, so that positioning can be realized, and the two parts can be more tightly matched; the friction coefficient of the plastic braking element 4 is higher.
Claims (9)
1. A linear actuator for lifting a table post, comprising:
a screw rod;
a rotating bearing sleeved at the upper end part of the screw rod;
the bearing seat keeps circumferential static, the screw rod is inserted into the bearing seat, and the rotating bearing is arranged on the bearing seat;
the braking piece selectively rotates synchronously with the screw rod, and the braking piece is abutted with the bearing seat along the axial direction of the screw rod;
the clutch component is arranged between the screw rod and the braking piece and used for controlling the linkage relation between the screw rod and the braking piece, and comprises a spring seat fixed with the screw rod in the circumferential direction and a torsion spring arranged on the spring seat; the torsion spring comprises a torsion arm which is inserted into the braking piece; when the clutch component is configured to rotate forward, the torsion spring radially expands, the clutch component breaks the linkage between the screw and the brake piece, and the screw and the spring seat rotate relative to the bearing seat; when the screw rod rotates reversely, the torsion spring radially contracts and rotates along with the screw rod and the spring seat, and meanwhile, the braking piece is driven to rotate relative to the bearing seat, and friction is generated between the braking piece and the bearing seat.
2. The lift table post linear actuator of claim 1, wherein: and a friction piece is further arranged between the brake piece and the bearing seat, an inner friction surface is arranged on the friction piece, an outer friction surface is arranged at the upper end part of the brake piece, the upper end part of the brake piece enters the friction piece, and the inner friction surface is abutted against the outer friction surface.
3. The lift table post linear actuator of claim 2, wherein: the friction piece is annular, embedded in the bearing seat and faces the braking piece.
4. The lift table post linear actuator of claim 2, wherein: the friction piece is a plastic piece.
5. The lift table post linear actuator of claim 1, wherein: the upper end part of the braking piece is radially reduced from bottom to top, and the upper end part of the braking piece is arranged between the bearing seats; the braking piece is a plastic piece.
6. The lift table post linear actuator of claim 2 or 5, wherein: the inner friction surface and the outer friction surface are conical surfaces.
7. The lift table post linear actuator of claim 1, wherein: and a thrust bearing is further arranged on the screw rod, one end of the thrust bearing is in interference fit with the screw rod, and the other end of the thrust bearing is in interference fit with the brake piece.
8. The lift table post linear actuator of claim 1, wherein: the brake piece is provided with an accommodating groove from bottom to top, and the spring seat is positioned in the accommodating groove; the braking piece is also provided with a clamping groove which is communicated with the accommodating groove, and the torsion arm of the torsion spring is inserted into the clamping groove.
9. The lift table post linear actuator of claim 1, wherein: the clutch mechanism is provided with two spring seats which are overlapped up and down along the axial direction of the screw rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321417026.7U CN220369663U (en) | 2023-06-06 | 2023-06-06 | Linear actuator of lifting table upright post |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321417026.7U CN220369663U (en) | 2023-06-06 | 2023-06-06 | Linear actuator of lifting table upright post |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220369663U true CN220369663U (en) | 2024-01-23 |
Family
ID=89570377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321417026.7U Active CN220369663U (en) | 2023-06-06 | 2023-06-06 | Linear actuator of lifting table upright post |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220369663U (en) |
-
2023
- 2023-06-06 CN CN202321417026.7U patent/CN220369663U/en active Active
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