Static holding force mechanism of push rod actuator
By designing a static retaining force mechanism in the push rod actuator, the limiting mechanism and limiting boss abutment are used to solve the problem of the door body's impact force retracting, and the static retaining of the door body and the convenience of user operation are achieved.
Patent Information
- Application Number
- CN202411730828.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-04-04
AI Technical Summary
In the push rod actuator, the door body retracts due to inertia and gravity, which makes the motor difficult to resist impact force, causing the door body to close and affect user operation.
A static retaining force mechanism is designed, including a bottom shell, upper cover, rack and rotary drive device, which abuts the limiting mechanism and the limiting boss to avoid the rack retraction and provide static retaining force for the door body.
Effectively resist the impact force brought by the retraction of the door body, keep the door body open, facilitate user operation and improve user experience.
Smart Images
Figure CN119754664A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of actuators, and in particular relates to a static retaining force mechanism of a push rod actuator. Background Art
[0002] With the development of economy and the progress of society, people's living standards have been greatly improved. As an indispensable electrical appliance in people's lives, home appliances are also constantly affecting people's lifestyles. Intelligence has become a mainstream trend in the home appliance industry. More intelligent home appliances use actuator technology solutions to automatically open or close the door. In practical applications, push rod actuators need to open the door and keep it open for a certain period of time. However, when the size of the home appliance is large and the weight of the door is relatively heavier, after the door is pushed open, the door will move a distance with inertia, and then the door will retreat due to gravity. This requires the actuator to provide a holding force after the door is pushed open to keep the door still for a period of time. However, when encountering a larger door, the impact force brought by the door is much greater than the holding force of the motor, causing the door to retreat.
[0003] Therefore, the above problems need to be solved urgently. Summary of the invention
[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a static holding force mechanism of a push rod actuator to provide static holding force for the door body to resist the impact force caused by the door body moving back, keep the door body in an open state, facilitate user operation, and enhance user experience.
[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a static holding force mechanism of a push rod actuator, comprising a bottom shell, the bottom shell is set as a hollow cavity with an opening at the upper end, an upper cover is connected to the top of the bottom shell, a rack is slidably connected to the bottom shell, the rack is slidably connected to the bottom shell along the long side, one end of the rack extends out of the bottom shell, and the rack is placed on the upper side of the bottom shell and connected to a rotating drive device, and the rotating axis of the rotating drive device is parallel to the movement direction of the rack. The rotating drive device is connected to a limiting mechanism, and the rotating drive device drives the limiting mechanism to rotate around the rotating axis of the rotating drive device. The upper cover is connected to a limiting boss on one side close to the bottom shell. The rotating drive device drives the limiting mechanism to rotate to a preset position, and when the door body retreats and impacts the rack, the limiting mechanism and the limiting boss abut. It is found in the process of use that when the weight of the door body is heavy, after the push rod actuator opens the door body, the door body will move a distance with inertia, and then the door body retreats and closes under the action of its own gravity. The holding force of the motor itself is difficult to resist the impact force brought by the retreat of the door body, causing the door body to close, affecting the user's operation. The present invention drives the rack to extend from between the bottom shell and the upper cover to open the door body for a certain distance, and then the rotating driving device drives the limiting mechanism to rotate to a preset angle. At this time, the limiting mechanism and the limiting boss are in contact, and when the door body retreats and impacts the rack, the limiting mechanism squeezes the limiting boss, and the limiting boss keeps the limiting mechanism in place, thereby preventing the rack from retreating, providing static holding force for the door body to resist the impact force caused by the retreat of the door body, and keeping the door body in an open state, which is convenient for user operation and improves user experience.
[0006] Furthermore, in the static holding force mechanism of the push rod actuator, there are two or more limit bosses, and the limit bosses are arranged in an array along the long side direction of the rack. The array of limit bosses can provide more limit positions, ensure that the limit mechanism and the limit bosses abut, so that the door body can stop at any position, provide more opening angles for the door body, meet the needs of different scenarios, and improve the user experience.
[0007] Furthermore, in the static holding force mechanism of the push rod actuator, the rotation drive device is set as a servo motor, the limit mechanism includes a connecting column and a limit column, the connecting column and the motor shaft of the rotation drive device are coaxially driven and connected, and the limit column is vertically connected to the middle of the connecting column. The servo motor can accurately control the position, speed and torque of the motor shaft, so that the rotation drive device can accurately control the position of the limit mechanism, ensuring that the limit mechanism and the limit boss abut to form a limit.
[0008] Furthermore, in the static holding force mechanism of the push rod actuator, the end of the limit column away from the connecting column is set as an inclined surface inclined in the direction of the rotary drive device, and the limit boss and the end of the limit column away from the connecting column are set accordingly. The contact surface of the limit column and the limit column are both set as inclined surfaces. During the contact process between the limit column and the limit column, the inclination of the inclined surface can be fine-tuned, so that the limit column automatically adjusts its position along the inclined surface to adapt to the contact deviation between the limit column and the limit column, so that the limit column and the limit column are restricted in both the horizontal and vertical directions, forming a reliable limit and improving the positioning accuracy.
[0009] Furthermore, in the static holding force mechanism of the push rod actuator, a reinforcing rib is provided at the connection portion between the connecting column and the limiting column, and the reinforcing rib is provided on the side of the limiting column away from the rotation drive device. The reinforcing rib arrangement improves the structural strength of the limiting column and the connecting column, improves the impact resistance of the limiting column, and improves the stability of the limiting column.
[0010] Furthermore, in the static holding force mechanism of the push rod actuator, a motor is connected to the side of the bottom shell close to the upper cover, and the motor is connected to the rack drive. The motor drives the rack to extend from between the bottom shell and the upper cover, and the position of the rack is precisely controlled by the electronic control system to improve the positioning accuracy of the rack. The motor control is also conducive to the realization of automation and the realization of intelligent home appliances.
[0011] Furthermore, in the static holding force mechanism of the push rod actuator, the motor shaft of the motor is connected with a coupling, and the coupling is engaged with the rack at one end away from the motor. While driving the rack to move, the coupling can reduce the impact force of the door body transmitted to the motor, thereby increasing the life of the motor. The coupling can compensate for installation errors, reduce vibration and noise, increase installation difficulty, and improve installation flexibility.
[0012] Furthermore, in the static holding force mechanism of the push rod actuator, a groove is provided on the side of the rack close to the motor, and two grooves are provided, which are respectively provided at both ends of the rack. The bottom shell is connected to a limit switch, and the limit switch is provided on the side of the rack where the groove is provided. When the limit switch contact is embedded in the groove, the limit switch is disconnected, and the control system identifies the position of the rack through the disconnection of the limit switch, and then controls the start and stop of the motor to avoid over-position of the rack and ensure that the door body is opened or closed.
[0013] Furthermore, in the static holding force mechanism of the above-mentioned push rod actuator, the coupling includes a motor connecting part and a rack meshing part, the motor connecting part and the rack meshing part are coaxially connected, the motor connecting part is coaxially connected to the motor shaft of the motor at one end away from the rack meshing part, the rack meshing part is provided with external teeth at one end away from the motor connecting part, and the rack meshing part is meshed with the rack at one end away from the motor connecting part.
[0014] Furthermore, in the static holding force mechanism of the push rod actuator, a buffer head is provided at one end of the rack away from the rotary drive device. When the rack is extended, the buffer head first contacts the door body, and the buffer head absorbs the impact force generated when the rack is extended, thereby preventing the door body from being damaged by the impact. The buffer head can also absorb the impact force generated when the door body retracts, thereby preventing the rack from receiving a large impact force, reducing rack wear or deformation, and extending the service life of the push rod actuator. The buffer head can reduce noise and improve the user experience.
[0015] It can be seen from the above technical scheme that the present invention has the following beneficial effects: the static holding force mechanism of the push rod actuator of the present invention, the limiting boss keeps the limiting mechanism in place, thereby preventing the rack from retreating, providing static holding force for the door body to resist the impact force caused by the retreat of the door body, and keeping the door body in an open state, which is convenient for user operation and improves the user experience. The limiting boss array is set so that the door body can stop at any position, providing more opening angles for the door body to meet the needs of different scenarios. The abutting surfaces of the limiting column and the limiting column are both set as inclined planes. During the contact process between the limiting column and the limiting column, the inclination of the inclined plane can be fine-tuned, so that the limiting column automatically adjusts its position along the inclined plane to adapt to the contact deviation between the limiting column and the limiting column, so that the limiting column and the limiting column are restricted in both the horizontal and vertical directions, forming a reliable limit and improving the positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the static holding force mechanism of the push rod actuator of the present invention; Figure 2 for Figure 1 Internal schematic diagram of Figure 3 is a bottom view of the upper cover; Figure 4 for Figure 2 A partial enlarged view of .
[0017] In the figure: 1, bottom shell, 2, upper cover, 21, limiting boss, 3, rack, 31, groove, 4, rotation drive device, 41, limiting mechanism, 411, connecting column, 412, limiting column, 413, reinforcing rib, 42, buffer head, 5, motor, 51, coupling, 511, motor connecting part, 512, rack meshing part. DETAILED DESCRIPTION
[0018] Example 1 like Figure 1-2The static holding force mechanism of a push rod actuator shown in the figure comprises a bottom shell 1, the bottom shell 1 is set as a hollow cavity with an opening at the upper end, the top of the bottom shell 1 is connected to an upper cover 2, the bottom shell 1 is slidably connected to a rack 3, the rack 3 is slidably connected to the bottom shell 1 along the long side, one end of the rack 3 extends out of the bottom shell 1, the rack 3 is placed on the upper side of the bottom shell 1 and is connected to a rotation drive device 4, the rotation axis of the rotation drive device 4 is parallel to the movement direction of the rack 3. The rotation drive device 4 is connected to a limiting mechanism 41, and the rotation drive device 4 drives the limiting mechanism 41 to rotate around the rotation axis of the rotation drive device 4. The upper cover 2 is connected to a limiting boss 21 on the side close to the bottom shell 1. The rotation drive device 4 drives the limiting mechanism 41 to rotate to a preset position, and when the door body retreats and impacts the rack 3, the limiting mechanism 41 and the limiting boss 21 abut. A buffer head 42 is provided on the end of the rack 3 away from the rotation drive device 4. The bottom shell 1 is connected to a motor 5 on the side close to the upper cover 2, and the motor 5 is drivingly connected to the rack 3. The motor shaft of the motor 5 is connected with a coupling 51, and the coupling 51 is meshed with the rack 3 at one end away from the motor 5. The coupling 51 includes a motor connecting portion 511 and a rack meshing portion 512, the motor connecting portion 511 and the rack meshing portion 512 are coaxially connected, the motor connecting portion 511 is coaxially connected with the motor shaft of the motor 5 at one end away from the rack meshing portion 512, the rack meshing portion 512 is provided with external teeth at one end away from the motor connecting portion 511, and the rack meshing portion 512 is meshed with the rack 3 at one end away from the motor connecting portion 511. The rack 3 is provided with a groove 31 on the side close to the motor 5, and there are two grooves 31, which are respectively arranged at both ends of the rack 3. The bottom shell 1 is connected with a limit switch, and the limit switch is arranged on the side of the rack 3 provided with the groove 31.
[0019] When the door needs to be opened, the motor 5 is started. The motor 5 drives the rack 3 to extend from between the bottom shell 1 and the upper cover 2 through the coupling 51. The rack 3 opens the door to a certain distance. The contact of the limit switch sinks into the groove 31. The motor 5 stops. Then the rotating drive device 4 drives the limit mechanism 41 to rotate to a preset angle. The limit mechanism 41 and the limit boss 21 are in the same straight line. The above straight line is parallel to the extension direction of the rack 3. When the door retreats and impacts the rack 3, the rack 3 retreats. The limit mechanism 41 squeezes the limit boss 21. The limit boss 21 keeps the limit mechanism 41 in place to prevent the rack 3 from retreating and provide static holding force for the door. The rack 3 stops for a few seconds. Then the rotating drive device 4 drives the limit mechanism 41 to reset. The limit mechanism 41 and the limit boss 21 are disengaged. The motor 5 reverses and drives the rack 3 to retract. When the contact of the limit switch sinks into the groove 31, the motor 5 stops.
[0020] like Figure 3 The static holding force mechanism of the push rod actuator shown in the figure has two or more limit bosses 21, and the limit bosses 21 are arranged in an array along the long side direction of the rack 3. When the door body is preset with more opening angles, the limit bosses 21 are arranged in an array so that the door body can stop at any position.
[0021] like Figure 4 The static holding force mechanism of the push rod actuator shown in the figure, the rotation drive device 4 is set as a servo motor, the limiting mechanism 41 includes a connecting column 411 and a limiting column 412, the connecting column 411 and the motor shaft of the rotation drive device 4 are coaxially driven and connected, and the limiting column 412 is vertically connected to the middle of the connecting column 411. The end of the limiting column 412 away from the connecting column 411 is set as an inclined surface inclined in the direction of the rotation drive device 4, and the limiting boss 21 and the end of the limiting column 412 away from the connecting column 411 are correspondingly arranged. The connection part of the connecting column 411 and the limiting column 412 is provided with a reinforcing rib 413, and the reinforcing rib 413 is arranged on the side of the limiting column 412 away from the rotation drive device 4. During the contact process between the limiting column 412 and the limiting column 412, the limiting column 412 is automatically adjusted along the inclined surface, so that the limiting column 412 and the limiting column 412 are restricted in both the horizontal direction and the vertical direction.
[0022] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with this field can understand the content of the present invention and implement it accordingly, and they cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.
Claims
1. A static holding force mechanism of a push rod actuator, characterized in that: The invention comprises a bottom shell (1), wherein the bottom shell (1) is set as a hollow cavity with an opening at the upper end, the top of the bottom shell (1) is connected to an upper cover (2), the bottom shell (1) is slidably connected to a rack (3), the rack (3) is slidably connected to the bottom shell (1) along the long side, one end of the rack (3) extends out of the bottom shell (1), the rack (3) is placed on the upper side of the bottom shell (1) and one end is connected to a rotation drive device (4), the rotation axis of the rotation drive device (4) is parallel to the movement direction of the rack (3); the rotation drive device (4) is connected to a limiting mechanism (41), and the rotation drive device (4) drives the limiting mechanism (41) to rotate around the rotation axis of the rotation drive device (4); the upper cover (2) is connected to a limiting boss (21) on one side close to the bottom shell (1); the rotation drive device (4) drives the limiting mechanism (41) to rotate to a preset position, and when the door body retreats and impacts the rack (3), the limiting mechanism (41) and the limiting boss (21) abut against each other.
2. The static holding force mechanism of the push rod actuator according to claim 1, characterized in that: Two or more of the limiting bosses (21) are provided, and the limiting bosses (21) are arranged in an array along the long side direction of the rack (3).
3. The static holding force mechanism of the push rod actuator according to claim 1, characterized in that: The rotation drive device (4) is configured as a servo motor, and the limiting mechanism (41) comprises a connecting column (411) and a limiting column (412), the connecting column (411) and a motor shaft of the rotation drive device (4) are coaxially drivingly connected, and the limiting column (412) is vertically connected to the middle of the connecting column (411).
4. The static holding force mechanism of the push rod actuator according to claim 3, characterized in that: One end of the limiting column (412) away from the connecting column (411) is arranged as an inclined surface inclined in the direction of the rotation drive device (4), and the limiting boss (21) and the limiting column (412) are arranged accordingly.
5. The static holding force mechanism of the push rod actuator according to claim 3, characterized in that: A reinforcing rib (413) is provided at the connection portion between the connecting column (411) and the limiting column (412), and the reinforcing rib (413) is provided on a side of the limiting column (412) away from the rotation drive device (4).
6. The static holding force mechanism of the push rod actuator according to claim 1, characterized in that: A motor (5) is connected to a side of the bottom shell (1) close to the upper cover (2), and the motor (5) is drivingly connected to the rack (3).
7. The static holding force mechanism of the push rod actuator according to claim 6, characterized in that: A coupling (51) is connected to the motor shaft of the motor (5), and an end of the coupling (51) away from the motor (5) is meshed with the rack (3).
8. The static holding force mechanism of the push rod actuator according to claim 7, characterized in that: A groove (31) is provided on a side of the rack (3) close to the motor (5), and two grooves (31) are provided, and the grooves (31) are provided at both ends of the rack (3); the bottom shell (1) is connected to a limit switch, and the limit switch is provided on the side of the rack (3) where the groove (31) is provided.
9. The static holding force mechanism of the push rod actuator according to claim 7, characterized in that: The coupling (51) comprises a motor connecting portion (511) and a rack meshing portion (512); the motor connecting portion (511) and the rack meshing portion (512) are coaxially connected; one end of the motor connecting portion (511) away from the rack meshing portion (512) is coaxially connected to a motor shaft of the motor (5); one end of the rack meshing portion (512) away from the motor connecting portion (511) is provided with external teeth; and one end of the rack meshing portion (512) away from the motor connecting portion (511) meshes with the rack (3).
10. The static holding force mechanism of the push rod actuator according to claim 1, characterized in that: A buffer head (42) is provided at one end of the rack (3) away from the rotary drive device (4).