Device with static retention and working method

Abstract

The invention provides a static retention device and a working method, the static retention device comprises a shell, the shell is a hollow cavity, a push plate is slidably connected in the shell, 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 situation that the door body retreats to pinch the user is avoided, and 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] The invention belongs to the technical field of actuators, and in particular relates to a static holding force device and a working method. Background Art

[0002] With the application of various automatic door opening and closing actuators, traditional door handles in high-end smart home appliances are gradually abandoned. In high-end smart home appliances, the push rod actuator is used to push the door body to a specific travel position, and then stays for a few seconds, so that the user has enough time to manually open the door body. However, due to the weight of the door body and the internal spring of the hinge, a large closing force will be generated. During this short period of stay, the actuator itself must have a certain static holding force. But when the door body is large and heavy, the self-locking force of the reduction motor is difficult to provide sufficient static holding force, and the door body will be closed due to the weight and the internal spring of the hinge, which brings inconvenience to the user's operation.

[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 device and a working method, which can provide sufficient holding force for the door body to keep the door body open, facilitate users to manually open the door body, improve user operation convenience, improve experience, avoid door body retreat and pinch users, and improve safety. At the same time, when the door body is subjected to excessive external force, the brake part fails and the door body can be closed to avoid accidental force on the door body and damage to the device.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a device with static holding force, including a shell, the shell is set as a hollow cavity, a push plate is slidably connected in the shell, and one end of the push plate extends out of the shell. A driving device is connected in the shell, and the driving device is connected to a coupling, the coupling and the push plate are connected in driving, and the driving device drives the push plate to extend out of the shell through the coupling. A braking part is provided at one end of the coupling away from the driving device, and a braking mechanism is connected to the shell. The braking mechanism is arranged near the braking part, the braking mechanism abuts the braking part, and the braking mechanism brakes the braking part. When the push plate is overloaded, the braking formed by the braking mechanism on the braking part fails. In the present invention, the driving device drives the push plate to extend out of the shell, thereby opening the door body, and then the braking mechanism is started, the braking mechanism brakes the braking part, and then the push plate is locked, providing a static holding force for the door body, and preventing the door body from closing due to excessive deadweight and the action of the internal spring of the hinge. When the door body is subjected to thrust or impact, the thrust received by 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 retreats, and the door body is closed. The present invention can provide sufficient holding force for the door body after the door body is pushed open, providing conditions for the user to manually open the door body, improving the user's operating convenience, improving the user experience, avoiding the door body from retracting and pinching the user, and improving safety. At the same time, when the door body is subjected to excessive external force, the brake part fails, and the door body can be closed, avoiding accidental force on the door body and causing damage to the device.

[0006] Further, in the above-mentioned device with static holding force, the braking mechanism includes an electromagnet and an armature, the electromagnet and the armature are connected by driving, and the electromagnet drives the armature to extend and retract. A locking part is connected to one 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. The electromagnet is set as a bistable electromagnet, which is in a stable state when the armature is extended and retracted. When the electromagnet is energized, the armature switches between the extended or retracted state. When the driving device drives the push plate to extend, the door body opens, and a current pulse is applied to the electromagnet, the armature extends, the locking part and the braking part abut, and the braking part is braked. At this time, the armature is in a stable extended state, which is maintained for a few seconds, and then the electromagnet is powered on again to apply a current pulse, and the armature retracts and remains in a retracted stable state. The application of a bistable electromagnet can arbitrarily switch between an extended or retracted stable state, and can keep the door body in an open state for a period of time, which is conducive to the user manually opening the door body, avoiding the door body from retreating, causing injuries, and improving safety.

[0007] Furthermore, in the above-mentioned static holding force device, the braking part is set as an external tooth column. The locking part is arranged at one end away from the armature and the braking part accordingly. During the braking process, the locking part and the braking part are meshed, and the braking part is locked, which will provide static holding force for the door body. When the force on the door body is too large, the braking part pushes the locking part, and the braking part applies a magnetic force greater than the magnetic force of the electromagnet on the armature, the locking part retreats and hits the teeth, and then the push plate retreats to avoid damage to the device.

[0008] Furthermore, in the above-mentioned static holding force device, the braking part is set to be cylindrical, and the outer side wall of the braking part is provided with a convex part, the cross section of the convex part is arc-shaped, and the convex part is arranged in an array around the axis of the braking part. The locking part is set to be arc-shaped at one end away from the electromagnet, and the locking part is provided with a protrusion corresponding to the convex part at one end away from the electromagnet. When the convex part of the braking part abuts against the locking part, the braking part is locked to provide a static holding force for the door body. When the force on the door body is too large, the braking part and the locking part slip, and the arc-shaped convex part can reduce friction, reduce wear, and increase the life of the device.

[0009] Furthermore, in the above-mentioned device with static holding force, the braking part is set to be cylindrical, a friction plate is provided on the outside of the braking part, and the end of the locking part away from the electromagnet is set to be an arc shape corresponding to the braking part, and a friction plate is provided on the end of the locking part 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, thereby 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, thereby protecting the device from damage and improving the service life of the device.

[0010] Furthermore, in the above-mentioned static holding force device, the push plate is set as a rack, the coupling and the push plate driving connection part are provided with external teeth, and the coupling and the push plate are meshed. Through the meshing of the coupling and the push plate, the push plate is pushed to move, which can improve the positioning accuracy, reduce the gap between components, and improve the stability of the device.

[0011] Furthermore, in the above-mentioned static holding force device, the push plate is provided with a double row of racks. The coupling is provided with double rows of external teeth corresponding to the push plate. The double row of racks has a stronger bearing capacity and can withstand a larger load, and can be used for a heavier door body. At the same time, the double row of teeth can reduce wear under heavy load conditions, increase the life of the device, and improve transmission stability and accuracy.

[0012] Furthermore, in the above-mentioned static holding force device, a positioning groove is provided on the side of the push plate close to the driving device, and the positioning grooves are arranged at both ends of the push plate. A limit switch is connected in the housing, and the limit switch is arranged on both sides of the driving device. When the contact of the limit switch enters the positioning groove, a positioning reference is provided for the control system, thereby controlling the start or stop of the driving device to prevent the push plate from being over-positioned.

[0013] Furthermore, in the above-mentioned static holding force device, the housing includes a bottom cover and an upper cover, and the bottom cover and the upper cover are connected with each other through openings. The bottom cover and the upper cover with openings facing each other have a simple structure and are easy to disassemble. The parts are arranged between the bottom cover and the upper cover, which can reduce the pollution of dust and oil and increase the service life of the device.

[0014] Furthermore, in the above-mentioned static holding force device, the driving device is set as a servo motor. The servo motor can accurately control the rotation speed, output torque, and position of the push plate to improve the performance of the device.

[0015] A method of operating a static holding force device, comprising the following steps: S1: The driving device is powered on and drives the push plate to extend out of the housing through the coupling. When the contact of the limit switch falls into the positioning groove, the driving device is powered off. S2: A current pulse is applied to the electromagnet, the armature extends, the armature pushes the locking part to move toward the braking part, the locking part brakes the braking part, and the armature maintains a stable extended state; S3: the electromagnet is powered on again to apply a current pulse, the armature retracts, the locking portion and the braking portion are separated, and the braking portion loses braking force; S4: The driving device reverses and drives the push plate to retract through the coupling.

[0016] It can be seen from the above technical solution that the present invention has the following beneficial effects: the present invention has a static holding force device, which brakes the braking part through the braking mechanism to provide static holding force for the door body, thereby preventing the door body from closing due to excessive deadweight and the action of the spring inside the hinge, providing conditions for users to manually open the door body, improving user operation convenience, improving experience, preventing the door body from retreating and pinching the user, and improving safety. When the door body is pushed or hit, the braking part rotates relative to the braking mechanism, and the push plate retreats, thereby preventing the door body from being accidentally stressed and causing damage to the device, and increasing the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the static holding force device of the present invention; Figure 2 for Figure 1 Internal schematic diagram of Figure 3 for Figure 2 A partial enlarged view of Figure 4 It is a schematic structural diagram of the locking part and the braking part of Example 1; Figure 5 It is a structural schematic diagram of the locking part and the braking part of Example 2; Figure 6 This is a schematic diagram of the structure of the locking part and the braking part of Example 3.

[0018] In the figure: 1, housing, 11, bottom cover, 12, upper cover, 2, push plate, 21, positioning groove, 3, driving device, 4, coupling, 41, braking part, 42, convex part, 5, braking mechanism, 51, electromagnet, 52, armature, 521, locking part, 6, limit switch. DETAILED DESCRIPTION

[0019] Example 1 like Figure 1-2 A static holding force device shown includes a housing 1, the housing 1 is set as a hollow cavity, a push plate 2 is slidably connected in the housing 1, and one end of the push plate 2 extends out of the housing 1. A driving device 3 is connected in the housing 1, and the driving device 3 is drivingly connected to a coupling 4. The coupling 4 and the push plate 2 are drivingly connected, and the driving device 3 drives the push plate 2 to extend out of the housing 1 through the coupling 4. A braking part 41 is provided at one end of the coupling 4 away from the driving device 3, and a braking mechanism 5 is connected to the housing 1. The braking mechanism 5 is arranged near the braking part 41, and the braking mechanism 5 abuts against the braking part 41, and the braking mechanism 5 brakes the braking part 41. When the push plate 2 is overloaded, the braking formed by the braking mechanism 5 on the braking part 41 fails. The push plate 2 is set as a rack, and the coupling 4 and the push plate 2 driving connection part are provided with external teeth, and the coupling 4 and the push plate 2 are meshed. The push plate 2 is set with a double row of racks. The coupling 4 is provided with double rows of external teeth corresponding to the push plate 2. The housing 1 comprises a bottom cover 11 and an upper cover 12, and the bottom cover 11 and the upper cover 12 are connected with each other through their openings. The driving device 3 is a servo motor.

[0020] like Figure 3 The static holding force device shown in the figure comprises an electromagnet 51 and an armature 52, the electromagnet 51 and the armature 52 are connected in driving, and the electromagnet 51 drives the armature 52 to extend and retract. The armature 52 is connected to a locking portion 521 at one end away from the electromagnet 51. When the brake mechanism 5 is energized, the electromagnet 51 drives the armature 52 to extend, and the locking portion 521 abuts against the brake portion 41. The electromagnet 51 is a bistable electromagnet, which is in a stable state when the armature 52 is extended or retracted. When the electromagnet is energized, the armature switches between the extended or retracted state.

[0021] like Figure 4The static holding force device shown in the figure has a brake part 41 set as an outer tooth column. The locking part 521 is set correspondingly to the brake part 41 away from one end of the armature 52. During the braking process, the locking part 521 and the brake part 41 are meshed, and the brake part 41 is locked, which will provide a static holding force for the door body. When the force on the door body is too large, the brake part 41 pushes the locking part 521, and the brake part 41 applies a magnetic force greater than the magnetic force of the electromagnet 51 on the armature 52 to the locking part 521, and the locking part 521 retreats and breaks teeth, and then the push plate 2 retreats to avoid damage to the device. A positioning groove 21 is provided on the side of the push plate 2 close to the drive device 3, and the positioning groove 21 is arranged at both ends of the push plate 2. A limit switch 6 is connected in the housing 1, and the limit switch 6 is arranged on both sides of the drive device 3. When the contact of the limit switch 6 enters the positioning groove 21, it provides a positioning reference for the control system, thereby controlling the start or stop of the drive device 3 to avoid over-positioning of the push plate 2.

[0022] When the door needs to be opened, the drive device 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 powered on and a current pulse is applied, the armature 52 extends, the locking portion 521 and the braking portion 41 are engaged, and the braking portion 41 is braked. At this time, the armature 52 is in a stable extended state and remains for a few seconds, providing a static holding force for the door. Then, the electromagnet 51 is powered on again and a current pulse is applied, the armature 52 retracts and remains in a retracted stable state. Then the drive device 3 reverses and retracts 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 thrust or impact, the thrust received by the push plate 2 exceeds the magnetic attraction of the electromagnet 51 to the armature 52, the brake fails, the braking portion 41 rotates relative to the locking portion 521, the push plate 2 retreats, and the door is closed.

[0023] A method of operating a static holding force device, comprising the following steps: S1: The driving device 3 is powered on, and the driving device 3 drives the push plate 2 to extend out of the housing 1 through the coupling 4. When the contact of the limit switch 6 is sunk into the positioning groove 21, the driving device 3 is powered off; S2: A current pulse is applied to the electromagnet 51, and the armature 52 extends. The armature 52 pushes the locking portion 521 to move toward the braking portion 41, and the locking portion 521 brakes the braking portion 41, and the armature 52 maintains a stable extended state; S3: the electromagnet 51 is powered on again to apply a current pulse, the armature 52 retracts, the locking portion 521 and the braking portion 41 are separated, and the braking portion 41 loses its braking force; S4: The driving device 3 reverses and drives the push plate 2 to retract through the coupling 4.

[0024] Example 2 The difference between this embodiment and embodiment 1 is that Figure 5As shown, the brake part 41 is set to be cylindrical, and the outer side wall of the brake part 41 is provided with a convex part 42, the cross section of the convex part 42 is arc-shaped, and the convex part 42 is arranged in an array around the axis of the brake part 41. The end of the locking part 521 away from the electromagnet 51 is set to be arc-shaped, and the end of the locking part 521 away from the electromagnet 51 is provided with a protrusion corresponding to the convex part 42. When the convex part 42 of the brake part 41 abuts against the locking part 521, the brake part 41 is locked. When the force on the door body is too large, the brake part 41 and the locking part 521 slip.

[0025] Example 3 The difference between this embodiment and embodiment 1 is that Figure 6 As shown, the braking part 41 is set to be cylindrical, a friction plate is provided on the outer side of the braking part 41, and the end of the locking part 521 away from the electromagnet 51 is set to be an arc shape corresponding to the braking part 41, and a friction plate is provided on 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.

[0026] 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 device with static holding force, characterized in that: The invention comprises a shell (1), wherein the shell (1) is configured as a hollow cavity, a push plate (2) is slidably connected to the shell (1), and one end of the push plate (2) extends out of the shell (1); a driving device (3) is connected to the shell (1), and the driving device (3) is drivingly connected to a coupling (4), and the coupling (4) and the push plate (2) are drivingly connected, and the driving device (3) drives the push plate (2) to extend out of the shell (1) through the coupling (4); a braking portion (41) is provided at one end of the coupling (4) away from the driving device (3), and the shell (1) is connected to a braking mechanism (5), and the braking mechanism (5) is arranged adjacent to the braking portion (41); the braking mechanism (5) abuts against the braking portion (41), and the braking mechanism (5) brakes the braking portion (41); when the push plate (2) is overloaded, the braking of the braking portion (41) by the braking mechanism (5) fails.

2. The static holding force device according to claim 1, characterized in that: The braking mechanism (5) comprises an electromagnet (51) and an armature (52); the electromagnet (51) and the armature (52) are connected in driving relation; the electromagnet (51) drives the armature (52) to extend and retract; an end of the armature (52) away from the electromagnet (51) is connected to a locking portion (521); when the braking mechanism (5) is energized, the electromagnet (51) drives the armature (52) to extend, and the locking portion (521) abuts against the braking portion (41).

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

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

5. The static holding force device according to claim 2, characterized in that: The braking portion (41) is configured as a cylinder, a friction plate is provided on the outside of the braking portion (41), the locking portion (521) at one end away from the electromagnet (51) is configured as an arc shape corresponding to the braking portion (41), and a friction plate is provided on one end of the locking portion (521) away from the electromagnet (51).

6. The static holding force device according to claim 1, characterized in that: The push plate (2) is configured as a rack, and a driving connection portion between the coupling (4) and the push plate (2) is provided with external teeth, and the coupling (4) and the push plate (2) are meshed.

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

9. The static holding force device according to claim 7, characterized in that: The housing (1) comprises a bottom cover (11) and an upper cover (12), and the openings of the bottom cover (11) and the upper cover (12) are relatively connected.

10. A method of operating a device having a static holding force, characterized in that: The following steps are involved: S1: the driving device (3) is powered on, and the driving device (3) drives the push plate (2) to extend out of the housing (1) through the coupling (4). When the contact of the limit switch (6) is sunk into the positioning groove (21), the driving device (3) is powered off; S2: A current pulse is applied to the electromagnet (51), the armature (52) extends, the armature (52) pushes the locking portion (521) to move toward the braking portion (41), the locking portion (521) brakes the braking portion (41), and the armature (52) maintains a stable extended state; S3: the electromagnet (51) is powered on again to apply a current pulse, the armature (52) retracts, the locking portion (521) and the braking portion (41) separate, and the braking portion (41) loses its braking force; S4: the driving device (3) is reversed, and the driving device (3) drives the push plate (2) to retract via the coupling (4).

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