Device with adjustable static retention force and working method

Abstract

The invention provides an adjustable static retention device and a working method, the adjustable static retention device comprises a driving motor, a driving shaft and a rack, a motor shaft of the driving motor is in driving connection with the driving shaft, the driving shaft is engaged with the rack, and the driving motor drives the rack to move through the driving shaft. A bottom cover is arranged on the lower side of the driving motor, a motor cavity is formed in the bottom cover, the driving motor is clamped in the motor cavity, a rack cavity is formed in the bottom cover, one end of the rack cavity is open, and the rack is slidably connected into the rack cavity and extends out of the opening of the rack cavity. And the motor cavity and the rack cavity are vertically crossed. A brake cavity is formed in the side, away from the motor cavity, of the rack cavity, an electromagnetic clutch is connected into the brake cavity, and a movable disc is arranged at the end, close to the electromagnetic clutch, of the driving shaft. And the electromagnetic clutch magnetically attracts the movable disc and brakes the driving shaft. Static retention force is provided for the door body through the electromagnetic clutch, a user can open the door body conveniently, and harm to personnel is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of actuators, and in particular relates to a device with adjustable static holding force and a working method. Background Art

[0002] High-end home appliances are moving towards the trend of intelligence, integration, and cabinet integration. Various types of automatic door opening and closing actuators are widely used. In order to enhance the overall aesthetics of the appearance of home appliances, traditional door handles are gradually being eliminated. Taking many home appliances as an example, during their operation, the push rod actuator pushes the door body to a specific travel position, which is convenient for users to open the door body. However, due to the weight of the door body and the internal spring of the hinge, the door body will generate a large closing force. The actuator needs to have a static holding force sufficient to resist the closing force and keep the door body paused for a few seconds so that the user can manually open the door body. The actuator often cannot meet actual needs by relying solely on the self-locking force of the motor itself.

[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-mentioned deficiencies, the present invention provides a device with adjustable static holding force and a working method, which can provide static holding force for the door body, prevent the door body from closing automatically, facilitate users to open the door body, prevent the door body from closing automatically and causing harm to personnel, and can adjust the static holding force to prevent the door body from being subjected to excessive external force, causing damage to the device and extending the service life.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a device with adjustable static holding force, including a driving motor, a driving shaft, and a rack. The motor shaft of the driving motor is connected to the driving shaft, the driving shaft and the rack are meshed, and the driving motor drives the rack to move through the driving shaft. A bottom cover is provided on the lower side of the driving motor, the bottom cover is provided with a motor cavity, the driving motor is clamped in the motor cavity, the bottom cover is provided with a rack cavity, one end of the rack cavity is open, the rack is slidably connected in the rack cavity, and the rack extends out from the opening of the rack cavity. The motor cavity and the rack cavity are both set in a rectangular shape, and the motor cavity and the rack cavity are arranged vertically and crosswise. A brake cavity is provided on the side of the rack cavity away from the motor cavity, and an electromagnetic clutch is connected in the brake cavity, and a moving disk is connected to the end of the driving shaft close to the electromagnetic clutch. The electromagnetic clutch magnetically attracts the moving disk, and the electromagnetic clutch brakes the driving shaft. During use, the driving motor is powered on, the rack is pushed out, the rack pushes the door body open, the electromagnetic clutch is powered on, the electromagnetic clutch magnetically attracts the moving disk on the driving shaft, and the electromagnetic clutch brakes the driving shaft to provide static holding force for the door body. The present invention provides a static holding force for the door body through an electromagnetic clutch, which is convenient for users to open the door body and prevents the door body from closing automatically and causing harm to personnel. At the same time, the electromagnetic force of the electromagnetic clutch is adjusted by adjusting the voltage or current of the electromagnetic clutch, and the braking force applied to the drive shaft is adjusted, thereby adjusting the static holding force of the door body. When the external force applied to the door body is greater than the static holding force, the braking force of the electromagnetic clutch fails and the moving plate slips, thereby avoiding damage to parts and extending the service life.

[0006] Furthermore, in the above-mentioned device with adjustable static holding force, a top cover is provided on the upper side of the bottom cover, and the bottom cover and the top cover opening are relatively connected. The parts are installed between the bottom cover and the top cover to avoid dust and oil pollution to the internal parts, thereby extending the service life of the device.

[0007] Furthermore, in the above-mentioned device with adjustable static holding force, the drive motor is provided with a clamping platform, and clamping rings are respectively connected to both ends of the drive motor, and the drive motor is clamped in the motor cavity through the clamping ring. The clamping platform and the clamping ring are clamped, and the upper and lower sides of the clamping ring are respectively set as planes that abut against the top cover and the bottom cover. The upper and lower sides of the clamping ring are provided with clamping grooves, and the bottom cover is provided with a boss corresponding to the clamping groove. The drive motor is clamped in the motor cavity through the clamping ring, and the clamping ring can buffer the impact force on the drive motor and extend the service life of the drive motor.

[0008] Furthermore, in the above-mentioned device with adjustable static holding force, the driving shaft includes a connecting portion, a first limiting portion, an avoidance portion, a second limiting portion, and a driving portion. The connecting portion, the first limiting portion, the avoidance portion, the second limiting portion, and the driving portion are coaxially arranged in sequence. The diameters of the first limiting portion and the second limiting portion are larger than the diameter of the avoidance portion. The outer wall of the driving portion is provided with external teeth. The driving portion is meshed with the rack. A limiting boss is provided at the bottom of the bottom cover, and the avoidance portion is connected to a groove provided on the limiting boss. The first limiting portion and the second limiting portion are respectively abutted against both sides of the limiting boss to provide limiting for the driving shaft, and the second limiting portion with a larger diameter can improve the mechanical strength of the driving shaft and enhance the stability of transmission.

[0009] Furthermore, in the above-mentioned device with adjustable static holding force, the bottom cover is provided with a supporting boss, the limiting boss and the supporting boss are arranged in parallel, and the driving part is connected to the groove provided on the limiting boss. The limiting boss and the supporting boss support the driving shaft, so that the driving shaft rotates in the groove, the stability of the driving shaft rotation is improved, the control accuracy of the rack is improved, and the stability of the rack braking the door body is ensured.

[0010] Furthermore, in the above-mentioned device with adjustable static holding force, the avoidance portion is provided with an avoidance groove, and the avoidance groove is arranged around the axis of the avoidance portion. The design of the avoidance groove can reduce the friction between the avoidance portion and the groove of the limiting boss, and grease is arranged in the avoidance groove to further reduce friction, reduce power loss, reduce wear, and increase service life.

[0011] Furthermore, in the above-mentioned device with adjustable static holding force, rollers are provided at the opening of the rack cavity, and the rollers are respectively provided on both sides of the rack, and the rack slides along the rollers. The rack slides in the rack cavity, and rollers are provided at the opening of the rack cavity to guide the rack to slide, reduce the friction and force between the rack and the opening of the rack cavity, avoid premature damage to the opening of the rack cavity due to friction and force, and improve the service life of the device. The roller setting can reduce the shaking of the rack and improve the stability of the rack.

[0012] Furthermore, in the above-mentioned device with adjustable static holding force, a limit groove is provided on the side of the rack close to the drive motor, and the limit groove is provided at both ends of the rack. The bottom surface of the bottom cover is connected to a limit switch, and the limit switch is provided on both sides of the drive motor. When the rack is extended, the contact of the limit switch is sunk into the limit groove, and the limit switch sends a signal to the control system, providing a positioning reference for the control system, thereby controlling the start or stop of the drive device to avoid over-extension of the limit switch.

[0013] Furthermore, in the above-mentioned device with adjustable static holding force, one end of the rack extending out of the rack cavity is connected to a flexible push block. When the rack pushes the door body, the flexible push block first contacts the door body, so that the rigid contact between the rack and the door body becomes a flexible contact, which can reduce the door opening noise, reduce the door body wear, and increase the service life.

[0014] Furthermore, in the above-mentioned device with adjustable static holding force, the bottom cover is provided with ears, and the ears are arranged along the outer periphery of the bottom cover. The device is fixed by the ears, and the ears arranged along the outer periphery of the bottom cover can improve the stability of the device.

[0015] A working method with an adjustable static holding force device, comprising the following steps: S1: The drive motor is energized, and the drive motor drives the rack to move. The rack moves along the roller, and the rack is pushed out from the opening of the rack cavity, and the rack pushes the door body open.

[0016] S2: The electromagnetic clutch is powered on, the drive motor is powered off, the electromagnetic clutch magnetically attracts the moving plate, and the electromagnetic clutch brakes the drive shaft through the moving plate and maintains the set time.

[0017] S3: The electromagnetic clutch is powered off, and the electromagnetic clutch and the moving plate are separated.

[0018] S4: The drive motor is powered on and reverses, and the rack moves back.

[0019] S5: The electromagnetic clutch is powered on, the drive motor is powered off, and the electromagnetic clutch magnetically attracts the moving plate.

[0020] It can be seen from the above technical scheme that the present invention has the following beneficial effects: the present invention has an adjustable static holding force device and a working method, which provides a static holding force for the door body through an electromagnetic clutch to prevent the door body from closing automatically, making it convenient for users to open the door body and prevent the door body from closing automatically, causing harm to personnel. At the same time, the electromagnetic force of the electromagnetic clutch is adjusted by adjusting the voltage or current of the electromagnetic clutch, and the braking force applied to the drive shaft is adjusted, thereby adjusting the static holding force of the door body. When the external force applied to the door body is greater than the static holding force, the braking force of the electromagnetic clutch fails and the moving plate slips, thereby avoiding damage to parts and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the interior of the device with adjustable static holding force of the present invention; Figure 2 is a structural schematic diagram of the bottom cover; Figure 3 It is a schematic diagram of the structure of the device with adjustable static holding force of the present invention; Figure 4 is a schematic diagram of the structure of the driving motor and the driving shaft; Figure 5 It is a left side view of the collar.

[0022] In the figure: 1, driving motor, 11, clamping table, 12, clamping ring, 121, clamping slot, 2, driving shaft, 21, connecting part, 22, first limiting part, 23, avoidance part, 231, avoidance slot, 24, second limiting part, 25, driving part, 28, moving plate, 3, rack, 31, limiting slot, 4, bottom cover, 41, motor cavity, 42, rack cavity, 42, rack cavity, 421, roller, 43, brake cavity, 44, limiting boss, 45, supporting boss, 46, ear, 5, electromagnetic clutch, 6, top cover, 7, limit switch. DETAILED DESCRIPTION

[0023] Example 1 like Figure 1-2 The device with adjustable static holding force shown in the figure comprises a driving motor 1, a driving shaft 2, and a rack 3. The motor shaft of the driving motor 1 is drivingly connected to the driving shaft 2, the driving shaft 2 and the rack 3 are meshed, and the driving motor 1 drives the rack 3 to move through the driving shaft 2. A bottom cover 4 is provided on the lower side of the driving motor 1, and the bottom cover 4 is provided with a motor cavity 41. The driving motor 1 is clamped in the motor cavity 41. The bottom cover 4 is provided with a rack cavity 42. One end of the rack cavity 42 is open. The rack 3 is slidably connected in the rack cavity 42, and the rack 3 extends out from the opening of the rack cavity 42. The motor cavity 41 and the rack cavity 42 are both set in a rectangular shape, and the motor cavity 41 and the rack cavity 42 are arranged vertically and crosswise. A brake cavity 43 is provided on the side of the rack cavity 42 away from the motor cavity 41, and an electromagnetic clutch 5 is connected in the brake cavity 43. The end of the driving shaft 2 close to the electromagnetic clutch 5 is connected to a moving disk 28. The electromagnetic clutch 5 magnetically attracts the moving disk 28, and the electromagnetic clutch 5 brakes the driving shaft 2. A roller 421 is provided at the opening of the rack cavity 42. The rollers 421 are respectively provided on both sides of the rack 3. The rack 3 slides along the rollers 421. A limit groove 31 is provided on the side of the rack 3 close to the drive motor 1. The limit groove 31 is provided at both ends of the rack 3. The bottom surface of the bottom cover 4 is connected to a limit switch 7. The limit switch 7 is provided on both sides of the drive motor 1. When the rack 3 is extended, the contact of the limit switch 7 is sunk into the limit groove 31, and the limit switch 7 sends a signal to the control system. A flexible push block is connected to one end of the rack 3 extending out of the rack cavity 42. The bottom cover 4 is provided with an ear 46, and the ear 46 is provided along the outer periphery of the bottom cover 4.

[0024] During use, the drive motor 1 is powered on, the rack 3 moves along the roller 421, and the rack 3 is pushed out from the opening of the rack cavity 42, and the rack 3 pushes the door body open. Then the electromagnetic clutch 5 is powered on, the drive motor 1 is powered off, the electromagnetic clutch 5 magnetically attracts the moving disk 28 on the drive shaft 2, and the electromagnetic clutch 5 brakes the drive shaft 2 and keeps it for a period of time, leaving time for the user to open the door body. Then the electromagnetic clutch 5 is powered off, the electromagnetic clutch 5 and the moving disk 28 are separated, the drive motor 1 rotates in the opposite direction, and the rack 3 retracts.

[0025] like Figure 2The device with adjustable static holding force shown in the figure has a top cover 6 on the upper side of the bottom cover 4, and the openings of the bottom cover 4 and the top cover 6 are relatively connected. The parts are installed between the bottom cover 4 and the top cover 6 to avoid dust and oil pollution to the internal parts and extend the service life of the device.

[0026] like Figure 3 The device with adjustable static holding force shown in the figure has a clamping platform 11, and the two ends of the drive motor 1 are respectively connected with a clamping ring 12, and the drive motor 1 is clamped in the motor cavity 41 through the clamping ring 12. The clamping platform 11 and the clamping ring 12 are clamped, and the upper and lower sides of the clamping ring 12 are respectively set as planes that abut against the top cover 6 and the bottom cover 4. The upper and lower sides of the clamping ring 12 are provided with a clamping groove 121, and the bottom cover 4 is provided with a boss corresponding to the clamping groove 121. The drive motor 1 is clamped in the motor cavity 41 through the clamping ring 12. The drive shaft 2 includes a connecting portion 21, a first limiting portion 22, an avoidance portion 23, a second limiting portion 24, and a driving portion 25. The connecting portion 21, the first limiting portion 22, the avoidance portion 23, the second limiting portion 24, and the driving portion 25 are coaxially arranged in sequence. The diameters of the first limiting portion 22 and the second limiting portion 24 are larger than the diameter of the avoidance portion 23. The outer wall of the driving portion 25 is provided with external teeth. The driving portion 25 is meshed with the rack 3. The bottom of the bottom cover 4 is provided with a limiting boss 44, the avoidance portion 23 is connected to the groove provided on the limiting boss 44, and the first limiting portion 22 and the second limiting portion 24 are respectively abutted against the two sides of the limiting boss 44 to provide a limit for the drive shaft 2. The bottom cover 4 is provided with a supporting boss 45 (see Figure 2 ), the limiting boss 44 and the supporting boss 45 are arranged in parallel, and the driving part 25 is connected to the groove provided on the limiting boss 44. The driving shaft 2 is supported by the limiting boss 44 and the supporting boss 45. The avoidance part 23 is provided with an avoidance groove 231, and the avoidance groove 231 is arranged around the axis of the avoidance part 23.

[0027] A working method with an adjustable static holding force device, comprising the following steps: S1: The driving motor 1 is powered on, and the driving motor 1 drives the rack 3 to move. The rack 3 moves along the roller 421, and the rack 3 is pushed out from the opening of the rack cavity 42, and the rack 3 pushes the door body open.

[0028] S2: The electromagnetic clutch 5 is powered on, the drive motor 1 is powered off, the electromagnetic clutch 5 magnetically attracts the moving plate 28, and the electromagnetic clutch 5 brakes the drive shaft 2 via the moving plate 28 and maintains the braking for a set time.

[0029] S3: The electromagnetic clutch 5 is powered off, and the electromagnetic clutch 5 and the moving plate 28 are separated.

[0030] S4: The driving motor 1 is powered on and rotates in the reverse direction, and the rack 3 moves back.

[0031] S5: The electromagnetic clutch 5 is powered on, the drive motor 1 is powered off, and the electromagnetic clutch 5 magnetically attracts the moving plate 28 .

[0032] 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 adjustable static holding force, characterized in that: The invention comprises a driving motor (1), a driving shaft (2), and a rack (3); the motor shaft of the driving motor (1) is drivingly connected to the driving shaft (2); the driving shaft (2) and the rack (3) are meshed; the driving motor (1) drives the rack (3) to move via the driving shaft (2); a bottom cover (4) is provided on the lower side of the driving motor (1); the bottom cover (4) is provided with a motor cavity (41); the driving motor (1) is snap-fitted into the motor cavity (41); the bottom cover (4) is provided with a rack cavity (42); the rack cavity ( The rack (3) is slidably connected to the rack cavity (42); the motor cavity (41) and the rack cavity (42) are vertically cross-arranged; a brake cavity (43) is provided on the side of the rack cavity (42) away from the motor cavity (41), an electromagnetic clutch (5) is connected to the brake cavity (43), and a moving plate (28) is connected to one end of the drive shaft (2) close to the electromagnetic clutch (5); the electromagnetic clutch (5) magnetically attracts the moving plate (28), and the electromagnetic clutch (5) brakes the drive shaft (2).

2. The device with adjustable static holding force according to claim 1, characterized in that: A top cover (6) is provided on the upper side of the bottom cover (4), and the openings of the bottom cover (4) and the top cover (6) are relatively connected.

3. The device with adjustable static holding force according to claim 2, characterized in that: The drive motor (1) is provided with a clamping platform (11), and clamping rings (12) are respectively connected to both ends of the drive motor (1). The drive motor (1) is clamped into the motor cavity (41) via the clamping ring (12). The clamping platform (11) and the clamping ring (12) are clamped together, and the upper and lower sides of the clamping ring (12) are respectively provided as planes that abut against the top cover (6) and the bottom cover (4); the upper and lower sides of the clamping ring (12) are provided with clamping grooves (121), and the bottom cover (4) is provided with a boss corresponding to the clamping groove (121).

4. The device with adjustable static holding force according to claim 1, characterized in that: The driving shaft (2) comprises a connecting portion (21), a first limiting portion (22), an avoiding portion (23), a second limiting portion (24), and a driving portion (25); the connecting portion (21), the first limiting portion (22), the avoiding portion (23), the second limiting portion (24), and the driving portion (25) are coaxially arranged in sequence; the diameters of the first limiting portion (22) and the second limiting portion (24) are larger than the diameter of the avoiding portion (23); the outer wall of the driving portion (25) is provided with external teeth; the driving portion (25) and the rack (3) are meshed; a limiting boss (44) is provided at the bottom of the bottom cover (4); the avoiding portion (23) is connected to a groove provided in the limiting boss (44), and the first limiting portion (22) and the second limiting portion (24) are respectively abutted against two sides of the limiting boss (44).

5. The device with adjustable static holding force according to claim 4, characterized in that: The bottom cover (4) is provided with a supporting boss (45), the limiting boss (44) and the supporting boss (45) are arranged in parallel, and the driving part (25) is connected to a groove provided in the limiting boss (44).

6. The device with adjustable static holding force according to claim 4, characterized in that: The avoidance portion (23) is provided with an avoidance groove (231), and the avoidance groove (231) is arranged around the axis of the avoidance portion (23).

7. The device with adjustable static holding force according to claim 1, characterized in that: Rollers (421) are provided at the opening of the rack cavity (42), and the rollers (421) are respectively provided on both sides of the rack (3), and the rack (3) slides along the rollers (421).

8. The device with adjustable static holding force according to claim 1, characterized in that: A limit groove (31) is provided on one side of the rack (3) close to the drive motor (1), and the limit groove (31) is provided at both ends of the rack (3); the bottom surface of the bottom cover (4) is connected to a limit switch (7), and the limit switch (7) is provided at both sides of the drive motor (1).

9. The device with adjustable static holding force according to claim 1, characterized in that: One end of the rack (3) extending out of the rack cavity (42) is connected to a flexible push block.

10. A method of working with an adjustable static holding force device, characterized in that: The following steps are involved: S1: The drive motor (1) is powered on, the drive motor (1) drives the rack (3) to move, the rack (3) moves along the roller (421), the rack (3) is pushed out from the opening of the rack cavity (42), and the rack (3) pushes the door body open; S2: the electromagnetic clutch (5) is powered on, the drive motor (1) is powered off, the electromagnetic clutch (5) magnetically attracts the moving disk (28), and the electromagnetic clutch (5) brakes the drive shaft (2) via the moving disk (28) and maintains the braking for a set time; S3: the electromagnetic clutch (5) is powered off, and the electromagnetic clutch (5) and the moving plate (28) are separated; S4: the driving motor (1) is powered on and rotates in the reverse direction, and the rack (3) retracts; S5: The electromagnetic clutch (5) is powered on, the drive motor (1) is powered off, and the electromagnetic clutch (5) magnetically attracts the driving disc (28).

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