Device with static retention force

Abstract

The utility model provides a device with static retention force, which comprises a shell, the shell is a hollow cavity, a push plate is connected in the shell in a sliding manner, and one end of the push plate extends out of the shell. A driving device is connected into the shell and is in driving connection with a coupler, the coupler is in driving connection with the push plate, and the driving device drives the push plate to extend out of the shell through the coupler. A braking part is arranged at the end, away from the driving device, of the coupler, the shell is connected with a braking mechanism, and the braking mechanism is close to the braking part, abuts against the braking part and brakes the braking part. And when the push plate is overloaded, the brake mechanism fails to brake the brake part. After the door body is pushed open, enough holding force can be provided for the door body, conditions are provided for a user to manually open the door body, the operation convenience of the user is improved, the door body is prevented from returning to pinch the user, and the safety is improved. Meanwhile, when the door body is subjected to overlarge external force, the door body can be closed, and the situation that the door body is accidentally stressed, and device damage is caused is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of actuator technology, specifically relating to a device with static holding force. Background Technology

[0002] With the application of various automatic door opening and closing actuators, traditional door handles in high-end smart home appliances are gradually being abandoned. In high-end smart home appliances, push-rod actuators push the door to a specific travel position and then pause for a few seconds, giving the user enough time to manually open the door. However, due to the door's own weight and the action of the springs inside the hinges, a considerable closing force is generated. During this brief pause, the actuator itself must possess a certain static holding force. But when the door is large and heavy, the self-locking force of the geared motor is insufficient to provide enough static holding force, and the door will close due to its own weight and the action of the springs inside the hinges, causing inconvenience to the user.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a static holding force device that can provide sufficient holding force to the door to keep the door open, making it easy for the user to manually open the door, improving the user's operation convenience and experience, preventing the door from retracting and pinching the user, and improving safety. At the same time, when the door is subjected to excessive external force, the braking part fails, and the door can close, preventing the door from being accidentally subjected to force and causing damage to the device.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a static holding force device, including a housing, which is a hollow cavity. A push plate is slidably connected inside the housing, with one end of the push plate extending out of the housing. A drive device is connected inside the housing, and the drive device drives a coupling connected to it. The coupling and the push plate are driven together, and the drive device drives the push plate to extend out of the housing via the coupling. A braking part is provided at the end of the coupling away from the drive device. A braking mechanism is connected to the housing, and the braking mechanism is located near the braking part, abutting against the braking part and braking it. When the push plate is overloaded, the braking mechanism fails to apply pressure to the braking part. In this utility model, the drive device drives the push plate to extend out of the housing, thereby opening the door. Then, the braking mechanism is activated, braking the braking part and locking the push plate, providing a static holding force for the door and preventing the door from closing due to excessive weight and the action of the spring inside the hinge. When the door is subjected to a pushing force or impact, if the pushing force on the push plate exceeds the braking force formed by the braking mechanism and the braking part, the braking fails, the braking part rotates relative to the braking mechanism, the push plate retracts, and the door closes. This invention provides sufficient retaining force to the door after it is pushed open, allowing the user to manually open the door, improving user convenience and experience, preventing the door from retracting and injuring the user, and enhancing safety. Simultaneously, when the door is subjected to excessive external force, the braking mechanism fails, allowing the door to close, preventing accidental force on the door and damage to the device.

[0006] Furthermore, in the aforementioned static holding force device, the braking mechanism includes an electromagnet and an armature, which are driven together. The electromagnet drives the armature to extend and retract. A locking part is connected to the end of the armature away from the electromagnet. When the braking mechanism is energized, the electromagnet drives the armature to extend, and the locking part and the braking part abut against each other. The electromagnet is a bistable electromagnet, which is stable in both the extended and retracted states of the armature. When the electromagnet is energized, the armature switches between the extended and retracted states. When the drive device drives the push plate to extend and the door opens, a current pulse is applied to the electromagnet, the armature extends, and the locking part and the braking part abut against each other, braking the braking part. At this time, the armature is in a stable extended state, which is maintained for a few seconds. Then, the electromagnet is energized again and a current pulse is applied, and the armature retracts and remains in the retracted stable state. The application of the bistable electromagnet allows for arbitrary switching between the extended and retracted stable states, keeping the door open for a period of time. This facilitates manual opening of the door by the user, preventing the door from retracting and causing injury, and improving safety.

[0007] Furthermore, in the aforementioned static holding force device, the braking part is configured as an external toothed column. The locking part is positioned at the end furthest from the armature, corresponding to the braking part. During braking, the locking part and the braking part engage, locking the braking part and providing a static holding force to the door. When the door is subjected to excessive force, the braking part pushes the locking part. When the braking part applies a force greater than the magnetic force exerted by the electromagnet on the armature, the locking part retracts and engages its teeth, causing the push plate to retract and preventing damage to the device.

[0008] Furthermore, in the aforementioned static holding force device, the braking part is cylindrical, and its outer wall has a protrusion with an arc-shaped cross-section. These protrusions are arranged in an array around the axis of the braking part. The locking part, at the end furthest from the electromagnet, is arc-shaped, and has a corresponding protrusion at that end. When the protrusion on the braking part abuts against the locking part, the braking part is locked, providing a static holding force for the door. When the door is subjected to excessive force, the braking part and locking part may slip. The arc-shaped protrusion reduces friction, lowers wear, and extends the device's lifespan.

[0009] Furthermore, in the aforementioned static holding force device, the braking part is cylindrical, with a friction plate on its outer side. The locking part, at the end away from the electromagnet, is arc-shaped, corresponding to the braking part, and also has a friction plate at the end away from the electromagnet. When the locking part and the braking part are braked by the friction plate, the friction force can be adjusted by adjusting the thrust of the locking part, thereby adjusting the static holding force and improving the adaptability of the device. At the same time, when the torque of the braking part is greater than the friction force, the locking part and the braking part slip, protecting the device from damage and extending its service life.

[0010] Furthermore, in the aforementioned static holding force device, the push plate is configured as a rack, and the coupling and push plate drive connection are provided with external teeth, with the coupling and push plate meshing. By meshing the coupling and push plate, the push plate is driven to move, which can improve positioning accuracy, reduce component clearance, and improve device stability.

[0011] Furthermore, in the aforementioned static holding force device, the push plate is equipped with a double-row rack. The coupling is equipped with a double-row external tooth corresponding to the push plate. The double-row rack configuration has a stronger load-bearing capacity and can withstand greater loads, making it suitable for heavier door bodies. At the same time, the double-row teeth can reduce wear under heavy loads, improve device lifespan, and enhance transmission stability and accuracy.

[0012] Furthermore, in the aforementioned static holding force device, the push plate has a positioning groove on the side near the drive device, with the positioning grooves located at both ends of the push plate. Limit switches are connected inside the housing, with the limit switches located on both sides of the drive device. When the contacts of the limit switches enter the positioning grooves, a positioning reference is provided for the control system, thereby controlling the start or stop of the drive device and preventing the push plate from over-positioning.

[0013] Furthermore, in the aforementioned static holding force device, the housing includes a bottom cover and a top cover, with the bottom cover and top cover opening opposite each other. The bottom cover and top cover with opposite openings have a simple structure and are easy to disassemble. Placing the parts between the bottom cover and top cover openings can reduce dust and oil contamination and extend the service life of the device.

[0014] Furthermore, in the aforementioned static holding force device, the driving device is a servo motor. The servo motor can precisely control the rotational speed and output torque, and precisely control the position of the push plate, thereby improving the device's performance.

[0015] As can be seen from the above technical solution, this utility model has the following beneficial effects: This utility model has a static holding force device. By braking the braking part through the braking mechanism, a static holding force is provided to the door, preventing the door from closing due to excessive weight and the action of the internal spring of the hinge. This provides conditions for users to manually open the door, improving user convenience and experience, and preventing the door from retracting and injuring the user, thus improving safety. When the door is subjected to pushing force or impact, the braking part rotates relative to the braking mechanism, and the push plate retracts, preventing accidental force on the door and damage to the device, thereby increasing the device's service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the static holding force device of this utility model;

[0017] Figure 2 for Figure 1 Internal diagram;

[0018] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0019] Figure 4 This is a schematic diagram of the locking and braking parts in Embodiment 1;

[0020] Figure 5 This is a schematic diagram of the locking and braking parts in Embodiment 2;

[0021] Figure 6 This is a schematic diagram of the locking and braking parts in Example 3.

[0022] In the diagram: 1. Housing, 11. Bottom cover, 12. Top cover, 2. Push plate, 21. Positioning groove, 3. Drive device, 4. Coupling, 41. Braking part, 42. Protrusion, 5. Braking mechanism, 51. Electromagnet, 52. Armature, 521. Locking part, 6. Limit switch. Detailed Implementation

[0023] Example 1

[0024] like Figure 1-2A static holding force device is shown, comprising a housing 1, which is a hollow cavity. A push plate 2 is slidably connected inside the housing 1, with one end of the push plate 2 extending out of the housing 1. A drive device 3 is connected inside the housing 1, and a coupling 4 is driven by the drive device 3. The coupling 4 and the push plate 2 are driven to extend out of the housing 1 via the coupling 4. A braking part 41 is provided at the end of the coupling 4 away from the drive device 3. A braking mechanism 5 is connected to the housing 1 and is located adjacent to the braking part 41. The braking mechanism 5 abuts against the braking part 41 and brakes the braking part 41. When the push plate 2 is overloaded, the braking of the braking part 41 by the braking mechanism 5 fails. The push plate 2 is a rack, and the drive connection between the coupling 4 and the push plate 2 is provided with external teeth, which mesh with the coupling 4. The push plate 2 is provided with a double-row rack. The coupling 4 is provided with a double-row external tooth corresponding to the push plate 2. The housing 1 includes a bottom cover 11 and a top cover 12, with the openings of the bottom cover 11 and the top cover 12 connected to each other. The drive device 3 is a servo motor.

[0025] like Figure 3 The illustrated static holding force device includes a braking mechanism 5 comprising an electromagnet 51 and an armature 52, which are driven together. The electromagnet 51 drives the armature 52 to extend or retract. A locking part 521 is connected to the end of the armature 52 away from the electromagnet 51. When the braking mechanism 5 is energized, the electromagnet 51 drives the armature 52 to extend, and the locking part 521 abuts against the braking part 41. The electromagnet 51 is a bistable electromagnet, which is stable in both the extended and retracted states of the armature 52. When the electromagnet is energized, the armature switches between the extended and retracted states.

[0026] like Figure 4 The device shown has a static holding force, with the braking part 41 configured as an external toothed column. The locking part 521, located away from the armature 52, is correspondingly positioned with the braking part 41. During braking, the locking part 521 and the braking part 41 engage, locking the braking part 41 and providing a static holding force to the door. When the door is subjected to excessive force, the braking part 41 pushes the locking part 521. When the force applied by the braking part 41 to the locking part 521 exceeds the magnetic force exerted by the electromagnet 51 on the armature 52, the locking part 521 retracts and engages its teeth, causing the push plate 2 to retract, thus preventing damage to the device. The push plate 2 has a positioning groove 21 on the side near the drive device 3, located at both ends of the push plate 2. Limit switches 6 are connected inside the housing 1, located on both sides of the drive device 3. When the contacts of the limit switches 6 enter the positioning groove 21, a positioning reference is provided for the control system, thereby controlling the start or stop of the drive device 3 and preventing the push plate 2 from over-positioning.

[0027] When the door needs to be opened, the drive unit 3 drives the push plate 2 to extend out of the housing 1, and the push plate 2 pushes the door open. Then, the electromagnet 51 is energized to apply a current pulse, the armature 52 extends, the locking part 521 and the braking part 41 engage, braking the braking part 41. At this time, the armature 52 is in a stable extended state and remains so for a few seconds, providing static holding force for the door. Then, the electromagnet 51 is energized again to apply a current pulse, the armature 52 retracts and remains in a stable retracted state. Then, the drive unit 3 reverses to retract the push plate 2. When the push plate 2 pushes the door out and the armature 52 is in a stable extended state, if the door is subjected to a pushing force or impact, and the pushing force on the push plate 2 exceeds the magnetic attraction force of the electromagnet 51 on the armature 52, the braking fails, the braking part 41 rotates relative to the locking part 521, the push plate 2 retracts, and the door closes.

[0028] Example 2

[0029] The difference between this embodiment and Embodiment 1 is that, as Figure 5 As shown, the braking part 41 is cylindrical, and its outer wall has a protrusion 42 with an arc-shaped cross-section. The protrusions 42 are arranged in an array around the axis of the braking part 41. The locking part 521 is arc-shaped at the end away from the electromagnet 51, and has a protrusion corresponding to the protrusion 42 at the end away from the electromagnet 51. When the protrusion 42 of the braking part 41 abuts against the locking part 521, the braking part 41 is locked. When the door is subjected to excessive force, the braking part 41 and the locking part 521 slip.

[0030] Example 3

[0031] The difference between this embodiment and Embodiment 1 is that, as Figure 6 As shown, the braking part 41 is cylindrical, and a friction plate is provided on the outer side of the braking part 41. The locking part 521, at the end away from the electromagnet 51, is arc-shaped corresponding to the braking part 41, and a friction plate is provided at the end of the locking part 521 away from the electromagnet 51. When the locking part 521 and the braking part 41 are braked by the friction plate, the friction force can be adjusted by adjusting the thrust of the locking part 521, thereby adjusting the static holding force. When the torque of the braking part 41 is greater than the friction force, the locking part 521 and the braking part 41 slip.

[0032] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A device with static holding force, characterized in that: The device includes a housing (1), which is a hollow cavity. A push plate (2) is slidably connected inside the housing (1), and one end of the push plate (2) extends out of the housing (1). A drive device (3) is connected inside the housing (1), and the drive device (3) drives a coupling (4) to be connected. The coupling (4) and the push plate (2) are driven to extend out of the housing (1) through the coupling (4). A braking part (41) is provided at the end of the coupling (4) away from the drive device (3). A braking mechanism (5) is connected to the housing (1), and the braking mechanism (5) is located near the braking part (41). The braking mechanism (5) abuts against the braking part (41) and brakes the braking part (41). When the push plate (2) is overloaded, the braking of the braking part (41) by the braking mechanism (5) fails.

2. The device with static holding force according to claim 1, characterized in that: The braking mechanism (5) includes an electromagnet (51) and an armature (52), which are driven to extend and retract. The electromagnet (51) drives the armature (52) to extend and retract. A locking part (521) is connected to the end of the armature (52) away from the electromagnet (51). When the braking mechanism (5) is energized, the electromagnet (51) drives the armature (52) to extend, and the locking part (521) and the braking part (41) abut against each other.

3. The device with static holding force according to claim 2, characterized in that: The braking part (41) is configured as an external toothed column; the locking part (521) is located at the end away from the armature (52) and is correspondingly configured with the braking part (41).

4. The device with static holding force according to claim 2, characterized in that: The braking part (41) is cylindrical, and the outer wall of the braking part (41) is provided with a protrusion (42). The cross-section of the protrusion (42) is arc-shaped, and the protrusions (42) are arranged in an array around the axis of the braking part (41). The locking part (521) is arc-shaped at the end away from the electromagnet (51), and the locking part (521) is provided with a protrusion corresponding to the protrusion (42) at the end away from the electromagnet (51).

5. The device with static holding force according to claim 2, characterized in that: The braking part (41) is cylindrical, and a friction plate is provided on the outer side of the braking part (41). The locking part (521) is arc-shaped at the end away from the electromagnet (51) and is provided with a friction plate at the end away from the electromagnet (51).

6. The device with static holding force according to claim 1, characterized in that: The push plate (2) is configured as a rack, and the drive connection part of the coupling (4) and the push plate (2) is provided with external teeth, and the coupling (4) and the push plate (2) mesh.

7. The device with static holding force according to claim 6, characterized in that: The push plate (2) is provided with a double row of racks; the coupling (4) is provided with a double row of external teeth corresponding to the push plate (2).

8. The device with static holding force according to claim 6, characterized in that: The push plate (2) is provided with a positioning groove (21) on the side near the drive device (3), and the positioning groove (21) is located at both ends of the push plate (2); the housing (1) is connected with a limit switch (6), and the limit switch (6) is located on both sides of the drive device (3).

9. The device with static holding force according to claim 7, characterized in that: The housing (1) includes a bottom cover (11) and a top cover (12), with the bottom cover (11) and the top cover (12) having openings connected to each other.

10. The device with static holding force according to claim 1, characterized in that: The drive device (3) is a servo motor.

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