Automatic door opening and closing mechanism and door box equipment

Abstract

The utility model relates to an automatic door opening and closing mechanism and door box equipment, which can realize full-angle automatic door opening and closing, improve user experience and improve safety performance. The automatic door opening and closing mechanism comprises a hinge spring system, the hinge spring system comprises a hinge assembly used for rotatably installing the door body assembly on the box body frame, a first pull rope connected with the hinge assembly and a spring used for being connected with the box body frame, and the spring is connected to the first pull rope; the first pull rope is used for applying a first tension moment smaller than a gravity moment of the door body assembly to the hinge assembly through the first pull rope; and the pull rope driving system comprises a driving motor and a second pull rope, one end of the second pull rope is connected to the driving motor, the other end of the second pull rope is connected to the hinge assembly, and the pull rope driving system is used for applying second tension torque opposite to the gravity torque of the door body assembly to the hinge assembly through the second pull rope.

Description

[0001] This application claims priority to Chinese Patent Application No. 202410170632.6, filed on February 6, 2024, entitled "A Household Appliance", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model relates to the field of home appliance technology, and in particular to an automatic door opening and closing mechanism and door box device. Background Technology

[0003] Door-mounted appliances such as built-in dishwashers are common household appliances. Typically, these appliances automatically open and close their doors using a push-rod mechanism on top of the appliance. However, existing push-rod mechanisms have several drawbacks. First, the push-rod extends too far after pushing the door open, affecting aesthetics. Second, the existing mechanism is limited to a small angle range for automatic opening and closing; the remaining angles still require manual operation, which often involves overcoming significant lock force, resulting in a poor user experience. Furthermore, during automatic closing, the push-rod mechanism in existing systems is usually rigidly connected to the lock to pull the door shut. If the user's hand is positioned between the door and the appliance at this point, it could easily pinch their hand, posing a significant safety hazard. Utility Model Content

[0004] Therefore, it is necessary to address the problems of existing push rod mechanisms that can only achieve automatic door opening and closing within a small angle range, resulting in poor user experience and safety hazards. This utility model provides an automatic door opening and closing mechanism and door box device that can achieve automatic door opening and closing at all angles, improving user experience and enhancing safety performance.

[0005] In one embodiment of this application, the present invention provides an automatic door opening and closing mechanism for being disposed between a housing frame and a door assembly, comprising:

[0006] A hinge spring system includes a hinge assembly for rotatably mounting the door assembly to the housing frame, a first pull cord connected to the hinge assembly, and a spring connected to the housing frame, the spring being connected to the first pull cord for applying a first pulling torque less than the gravitational torque of the door assembly to the hinge assembly via the first pull cord; and

[0007] A pull-cord drive system includes a drive motor and a second pull cord. One end of the second pull cord is connected to the drive motor, and the other end of the second pull cord is connected to the hinge assembly. The system is used to apply a second pulling torque to the hinge assembly through the second pull cord, which is opposite to the direction of the gravitational torque of the door assembly.

[0008] When the second pull cord is tightened under the drive of the drive motor, the second pulling torque applied by the second pull cord increases so that the sum of the first pulling torque and the second pulling torque is greater than the gravitational torque of the door assembly, thus automatically closing the door; when the second pull cord is released under the drive of the drive motor, the second pulling torque applied by the second pull cord decreases so that the sum of the first pulling torque and the second pulling torque is less than the gravitational torque of the door assembly, thus automatically opening the door.

[0009] According to one embodiment of this application, the second pull rope portion is wound around the output shaft of the drive motor to release or retract the second pull rope by the forward and reverse rotation of the drive motor.

[0010] According to one embodiment of this application, the hinge spring system further includes a guide roller for mounting on the housing frame, the guide roller being arranged adjacent to the drive motor, and the first pull cord extending from the spring around the guide roller to the hinge assembly.

[0011] According to one embodiment of this application, the hinge assembly includes a hinge base for fixed connection with the box frame, a hinge bracket for fixed connection with the door assembly, and a pivot for rotatably connecting the hinge bracket to the hinge base; the two ends of the first pull rope are respectively limited and connected to the hinge bracket and the free end of the spring.

[0012] According to one embodiment of this application, the automatic door opening and closing mechanism further includes an auxiliary door opening system. The auxiliary door opening system includes a pusher slidably disposed on the housing frame and a transmission mechanism disposed between the drive motor and the pusher. When the drive motor rotates forward to release the second pull rope, the pusher slides toward the hinge bracket under the transmission action of the transmission mechanism to push the hinge bracket, thereby applying a pushing torque to the door assembly in the same direction as the gravitational torque.

[0013] According to one embodiment of this application, the transmission mechanism includes a drive gear connected to the output shaft of the drive motor and a transmission gear meshing with the drive gear; the pushing member includes a pushing rod and a rack disposed on the pushing rod and meshing with the transmission gear.

[0014] According to one embodiment of this application, the transmission gear includes a gear shaft for rotatably connecting to the housing frame, a continuous toothed ring surrounding the gear shaft and cooperating with the drive gear, and a discontinuous toothed ring surrounding the gear shaft and cooperating with the rack.

[0015] According to one embodiment of this application, the intermittent toothed ring has tooth segments and smooth segments arranged circumferentially along the gear shaft; the pusher further includes a reset member connected to the pusher rod, wherein when the smooth segment of the intermittent toothed ring faces the rack, the pusher rod slides away from the hinge bracket under the action of the reset member.

[0016] According to one embodiment of this application, the drive motor has a built-in Hall sensor; the automatic door opening and closing mechanism further includes a door lock assembly disposed between the door assembly and the housing frame, a hovering micro switch activated by the hinge assembly in a hovering position, and an opening micro switch activated by the hinge assembly in an open position; the door lock assembly has a lock state and an unlock state that can be automatically switched between each other, and issues a closing completion signal when switching from the unlock state to the lock state.

[0017] According to another aspect of this application, one embodiment of this application further provides a door box device, including:

[0018] Box frame;

[0019] Door components; and

[0020] The automatic door opening and closing mechanism described above is disposed between the housing frame and the door assembly.

[0021] In summary, when closing the door, the pull-cord drive system of this application only needs to tighten the second pull cord via the drive motor, making the sum of the second pulling torque applied by the pull-cord drive system and the first pulling torque applied by the hinge spring system, M2, greater than the gravitational torque M1 of the door assembly, thereby breaking the torque balance and achieving automatic closing. When opening the door, the pull-cord drive system of this application also only needs to loosen the second pull cord via the drive motor, making the sum of the second pulling torque applied by the pull-cord drive system and the first pulling torque applied by the hinge spring system, M2, less than the gravitational torque M1 of the door assembly, thereby breaking the torque balance and achieving automatic opening. Simultaneously, when starting automatic opening, the pusher in the auxiliary opening system of this application can slide towards the hinge bracket to push the hinge bracket when the drive motor rotates forward to loosen the second pull cord, applying a pusher torque to the door assembly in the same direction as the gravitational torque, thereby overcoming the door lock torque and the gravitational torque and assisting in automatic opening.

[0022] Furthermore, since both the first and second pull ropes in the automatic door opening and closing mechanism of this application apply a pulling torque opposite to the gravitational torque of the door assembly through the hinge bracket, the torque required for the first pull rope to act on the hinge bracket is reduced. Therefore, the automatic door opening and closing mechanism of this application can significantly reduce the requirements for the spring and improve feasibility. At the same time, the torque of the second pull rope acting on the hinge bracket is only used to break the torque balance. Therefore, the drive motor only needs to output a small torque to apply the pulling torque required to break the torque balance to the door assembly through the second pull rope, which also helps to reduce the power requirements of the drive motor and improve feasibility. Attached Figure Description

[0023] Figure 1A A schematic diagram showing the curves of the tension torque applied to the hinge spring system and the gravitational torque of the door assembly as a function of the door opening angle;

[0024] Figure 1B A schematic diagram showing the ratio of the tension torque applied to the hinge spring system to the gravitational torque of the door assembly as a function of the door opening angle;

[0025] Figure 2 This is a perspective view of a door box device according to an embodiment of this application;

[0026] Figure 3 An enlarged schematic diagram of the automatic door opening and closing mechanism in the door box device according to the above embodiments of this application is shown;

[0027] Figure 4 An enlarged schematic diagram of the automatic door opening and closing mechanism according to the above embodiments of this application is shown from another perspective;

[0028] Figure 5 A schematic diagram showing the door assembly in a closed state in the door box device according to the above embodiments of this application is shown.

[0029] Figure 6 A schematic diagram of the auxiliary door opening system in the door box device according to the above embodiments of this application is shown.

[0030] Figure 7 A schematic diagram showing the door assembly in the open state in the door box device according to the above embodiments of this application is shown;

[0031] Figure 8 A schematic diagram showing the door assembly in a suspended state in the door box device according to the above embodiments of this application is shown.

[0032] Key component symbols: 1. Automatic door opening and closing mechanism; 10. Hinge spring system; 11. Hinge assembly; 111. Hinge base; 112. Hinge bracket; 113. Rotating shaft; 12. First pull rope; 13. Spring; 14. Guide roller; 20. Pull rope drive system; 21. Drive motor; 22. Second pull rope; 30. Auxiliary door opening system; 31. Pushing component; 311. Push rod; 312. Rack; 313. Reset component; 32. Transmission mechanism; 321. Drive gear; 322. Transmission gear; 3221. Gear shaft; 3222. Continuous toothed ring; 3223. Intermittent toothed ring; 32231. Tooth segment; 32232. Smooth segment; 40. Door lock assembly; 50. Door opening micro switch; 60. Hovering micro switch; 2. Box frame; 3. Door assembly.

[0033] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a further detailed explanation of this utility model. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] In some door frame devices, the suspension and non-suspended position of the door assembly are achieved by balancing or differentiating the torque generated by a hinge spring system with the door's weight torque. This hinge spring system mainly consists of a spring, a cord, and a hinge. The hinge is positioned between the frame and the door assembly, allowing the door assembly to pivot relative to the frame to change the door angle. The spring connects to the hinge via the cord to apply torque to the hinge. As the door angle changes, the weight G of the door assembly remains constant, but the lever arm Lg changes, causing the gravitational torque M1 = G * Lg to change with the door angle. Simultaneously, the tension in the cord changes with the door angle, causing the tension F exerted by the spring on the hinge through the cord and the lever arm Lf of the cord to both change. Therefore, the tension torque M2 = F * Lf also changes with the door angle.

[0040] Thus, by designing the hinge spring system parameters, it is generally possible to achieve M2≈M1 except for small angles, with its curve roughly varying with the door opening angle as shown in the figure. Figure 1A and 1B As shown: In areas outside the small angle, the existing hinge spring system can already achieve M2≈M1. The small difference can be compensated by friction to achieve torque balance hovering outside the small angle; while torque balance hovering within the small angle can be achieved by the action of door seal and door lock.

[0041] However, while this hinge spring system can allow the door to hover at all angles, it cannot automatically open or close the door. Therefore, the applicant has designed an automatic door opening and closing mechanism and door housing device that can achieve automatic opening and closing at all angles, improving user experience and enhancing safety performance.

[0042] Specifically, see the attached document. Figures 2 to 8 As shown, one embodiment of this application provides a door cabinet device, which may include a cabinet frame 2 with an opening, a door assembly 3 for covering the opening of the cabinet frame 2, and an automatic door opening and closing mechanism 1 disposed between the cabinet frame 2 and the door assembly 3, so as to realize automatic door opening and closing at all angles. It is understood that the door cabinet device of this application may be implemented as a sink dishwasher or refrigerator, etc.; in addition, the door cabinet device of this application may also include, but is not limited to, a functional body capable of realizing functions such as washing dishes or refrigeration, which will not be elaborated here.

[0043] More specifically, such as Figures 2 to 8 As shown, the automatic door opening and closing mechanism 1 may include a hinge spring system 10 and a pull rope drive system 20. The hinge spring system 10 includes a hinge assembly 11 for rotatably mounting the door assembly 3 to the housing frame 2, a first pull rope 12 connected to the hinge assembly 11, and a spring 13 connected to the housing frame 2. The spring 13 is connected to the first pull rope 12 and applies a first pulling torque m1, less than the gravitational torque M1 of the door assembly 3, to the hinge assembly 11 via the first pull rope 12. The pull rope drive system 20 includes a drive motor 21 and a second pull rope 22. One end of the second pull rope 22 is connected to the drive motor 21, and the other end is connected to the hinge assembly 11. It applies a second pulling torque m2, opposite in direction to the gravitational torque M1 of the door assembly 3, to the hinge assembly 11 via the second pull rope 22.

[0044] Thus, as Figure 3 and Figure 5 As shown, when the second pull rope 22 is tightened under the drive of the drive motor 21, the second pulling torque m2 applied by the second pull rope 22 increases so that the sum of the first pulling torque m1 and the second pulling torque m2, M2 = m1 + m2, is greater than the gravitational torque M1 of the door assembly 3, thus automatically closing the door; Figure 3 and Figure 7 As shown, when the second pull rope 22 is released under the drive of the drive motor 21, the second pulling torque m2 applied by the second pull rope 22 decreases so that the sum of the first pulling torque m1 and the second pulling torque m2 M2 = m1 + m2 is less than the gravitational torque M1 of the door assembly 3, and the door opens automatically.

[0045] It is worth noting that, such asFigure 8 As shown, when the drive motor 21 stops driving, the sum M2 of the first pulling torque m1 exerted by the first pull rope 12 on the door assembly 3 under the action of the spring 13 and the second pulling torque m1 exerted by the second pull rope 22 on the door assembly 3 is basically equal to the gravitational torque M1 of the door assembly 3, achieving a torque balance state, so that the door assembly 3 can be suspended relative to the box frame 2. Thus, as Figure 5 As shown, when the door needs to be closed, the pull cord drive system 20 only needs to tighten the second pull cord 22 through the drive motor 21, so that the second pulling torque m2 applied by the pull cord drive system 20 increases, thereby breaking the torque balance state and realizing automatic door closing; as Figure 6 and Figure 7 As shown, when the door needs to be opened, the pull-cord drive system 20 only needs to loosen the second pull cord 22 through the drive motor 21, thereby reducing the second pulling torque m2 applied by the pull-cord drive system 20, breaking the torque balance state, and realizing automatic door opening. In other words, the pull-cord drive system 20 of this application only needs to tighten or loosen the second pull cord 22 through the drive motor 21 to change the magnitude of the pulling force applied by the pull-cord drive system 20 to the door assembly 3, thereby changing the magnitude of the sum of the pulling torques M2, disrupting the original torque balance state, and realizing the automatic opening and closing of the door box device.

[0046] For example, such as Figure 3 and Figure 4 As shown, the second pull rope 22 is partially wound around the output shaft of the drive motor 21, so that the second pull rope 22 is loosened or tightened by the forward and reverse rotation of the drive motor 21, thereby increasing or decreasing the length of the second pull rope 22 between the hinge assembly 11 and the drive motor 21. It is understood that, in this application, the forward rotation of the drive motor 21 can be defined as the rotation direction that loosens the second pull rope 22, and the reverse rotation of the drive motor 21 can be defined as the rotation direction that tightens the second pull rope 22.

[0047] For example, such as Figures 5 to 8As shown, the second pull cord 22 is wound counterclockwise around the output shaft of the drive motor 21. When the drive motor 21 rotates counterclockwise, the second pull cord 22 wound around the output shaft is released to loosen it, increasing the length of the pull cord between the drive motor 21 and the hinge assembly 11, thereby reducing the second pulling torque m2 and breaking the torque balance to achieve automatic door opening. When the drive motor 21 rotates clockwise, the second pull cord 22 wound around the output shaft is wound to tighten it, decreasing the length of the pull cord between the drive motor 21 and the hinge assembly 11, thereby increasing the second pulling torque m2 and breaking the torque balance to achieve automatic door closing. In this case, clockwise rotation of the drive motor 21 corresponds to counterclockwise rotation, and counterclockwise rotation corresponds to clockwise rotation. It is understood that in other examples of this application, the second pull rope 22 may also be wound around the output shaft in a clockwise direction. In this case, the forward and reverse rotation of the drive motor 21 corresponds to clockwise rotation and counterclockwise rotation, respectively. This application will not elaborate further on this.

[0048] It is worth noting that the spring 13 can be, but is not limited to, a tension spring, with its two ends respectively connected to the housing frame 2 and the first pull rope 12. Thus, the first pull rope 12 applies a first tensile torque m1 to the door assembly 3 under the tension of the tension spring. It is understood that in other examples of this application, the spring 13 can also be implemented as a compression spring, as long as it can provide elastic force to achieve torque balance; this application will not elaborate further on this.

[0049] Optionally, such as Figures 2 to 8 As shown, the hinge assembly 11 includes a hinge base 111 for fixed connection with the housing frame 2, a hinge bracket 112 for fixed connection with the door assembly 3, and a pivot 113 rotatably connecting the hinge bracket 112 to the hinge base 111; the two ends of the first pull rope 12 are respectively limited and connected to the hinge bracket 112 and the free end of the spring 13. It is understood that the free end of the spring 13 mentioned in this application refers to the end of the spring 13 that is not connected to the housing frame 2.

[0050] It is worth noting that the limiting connection mentioned in this application may include, but is not limited to, fixed connection, sleeve connection and hook connection, as long as the spring 13 can apply a pulling torque to the door assembly 3 through the first pull rope 12. This application will not elaborate on this further.

[0051] Furthermore, during the opening and closing of the door, the hinge bracket 112 rotates around the pivot 113 along with the door assembly 3, causing the first pull rope 12 to change with the opening and closing of the door. This results in the spring 13 easily swinging significantly with the opening and closing of the door, requiring a sufficiently large installation space. To solve this problem, such as...Figures 2 to 8 As shown, the hinge spring system 10 of this application may further include a guide roller 14 around which the first pull rope 12 passes. The guide roller 14 is installed on the housing frame 2 to change the direction of the first pull rope 12, so that the direction of the tension force applied by the first pull rope 12 to the spring 13 remains fixed and is always consistent with the axial direction of the spring 13, thereby preventing the spring 13 from wobbling.

[0052] Optionally, such as Figures 5 to 8 As shown, the guide roller 14 is arranged adjacent to the drive motor 21, and the first pull rope 12 extends from the spring 13, first passing over the guide roller 14 to the hinge bracket 112, such that the direction of the tension force applied by the first pull rope 12 to the hinge bracket 112 is consistent with the direction of the tension force applied by the second pull rope 22 to the hinge bracket 112, thereby reducing the torque required by the first pull rope 12 on the hinge bracket 112, so as to significantly reduce the requirements on the spring 13 and improve feasibility.

[0053] At the same time, since the torque of the second pull rope 22 acting on the hinge bracket 112 is only used to break the torque balance, the drive motor 21 only needs to output a small torque to apply the torque required to break the torque balance to the door assembly 3 through the second pull rope 22, which helps to reduce the power requirements of the drive motor 21 and improve feasibility.

[0054] According to the above embodiments of this application, as Figure 2 and Figure 5 As shown, the automatic door opening and closing mechanism 1 may further include a door lock assembly 40 disposed between the door assembly 3 and the housing frame 2. The door lock assembly 40 has a lock state and an unlock state that can be automatically switched between each other, so as to releasably lock the door assembly 3 to the housing frame 2. In this way, when it is necessary to open the door, the door opening signal will trigger the door lock assembly 40 to automatically switch from the locked state to the unlocked state to issue an unlock signal; at this time, the drive motor 21 in the pull rope drive system 20 is triggered to rotate forward and release the second pull rope 22, so that the second pulling torque m2 on the door assembly 3 becomes smaller, thereby making the sum of the pulling torques M2 tend to decrease, disrupting the torque balance, and thus realizing automatic door opening.

[0055] Similarly, when the door needs to be closed, the closing signal will trigger the drive motor 21 to reverse and tighten the second pull rope 22, which will increase the second pulling torque m2 on the door assembly 3, thus causing the sum of the pulling torques M2 to tend to increase, disrupting the torque balance, thereby realizing automatic closing.

[0056] It is worth noting that since the door lock assembly 40 is usually located at the top of the housing frame 2, while the hinge assembly 11 is usually located at the bottom of the housing frame 2, the door lock lever arm of the door lock assembly 40 is usually much larger than the lever arm of the hinge spring system 10 and the pull rope drive system 20. Therefore, the existing hinge spring system 10 and pull rope drive system 20 require relatively large pulling forces. However, the automatic door opening and closing mechanism 1 of this application distributes the required pulling torque by means of the hinge spring system 10 and the pull rope drive system 20, which places lower requirements on the spring 13 and the drive motor 21 and is easier to implement.

[0057] Furthermore, when the door assembly 3 is in the closed state, although the drive motor 21 rotates forward to relax the second pull rope 22, causing the sum of the pulling torque M2 on the door assembly 3 to tend to decrease, the distance between the gravity line of the door assembly 3 and the pivot 113 is very small, that is, the gravity torque M1 of the door assembly 3 is very small. In addition, when the door lock assembly 40 is in the unlocked state, it will also apply a resistance torque to the door assembly 3 in the opposite direction to the gravity torque M1. Therefore, it may be difficult to open the door by relying solely on the gravity torque M1.

[0058] To solve this problem, such as Figures 2 to 8 As shown, the automatic door opening and closing mechanism 1 of this application may further include an auxiliary door opening system 30. The auxiliary door opening system 30 may include a pusher 31 slidably disposed on the housing frame 2 and a transmission mechanism 32 disposed between the drive motor 21 and the pusher 31. When the drive motor 21 rotates forward to release the second pull rope 22, the pusher 31 slides toward the hinge bracket 112 under the transmission action of the transmission mechanism 32 to push the hinge bracket 112, thereby applying a pushing torque to the door assembly 3 in the same direction as the gravitational torque M1 to overcome the resistance torque of the door lock assembly 40 and assist in completing the door opening action.

[0059] Optionally, such as Figures 3 to 6As shown, the transmission mechanism 32 includes a drive gear 321 connected to the output shaft of the drive motor 21 and a transmission gear 322 meshing with the drive gear 321; the pusher 31 includes a push rod 311 and a rack 312 disposed on the push rod 311 and meshing with the transmission gear 322. Thus, when the drive motor 21 drives the drive gear 321 to rotate forward to loosen the second pull rope 22, the transmission gear 322 rotates in reverse under the drive of the drive gear 321. This is achieved by converting the rotational motion of the transmission gear 322 into the linear motion of the push rod 311 via the rack 312, thereby driving the push rod 311 closer to the hinge bracket 112 to push against the hinge bracket 112, facilitating smooth door opening. Conversely, when the drive motor 21 drives the drive gear 321 to rotate in reverse to tighten the second pull rope 22, the transmission gear 322 rotates forward under the drive of the drive gear 321. This is achieved by converting the rotational motion of the transmission gear 322 into the linear motion of the push rod 311 via the rack 312, thereby driving the push rod 311 away from the hinge bracket 112 to avoid contact with the hinge bracket 112 and affecting automatic door closing. It is understood that in other examples of this application, the drive motor 21 may also be driven by a belt or chain connected to the transmission gear 322, which will not be described in detail here.

[0060] Optionally, such as Figure 3 and Figure 4 As shown, the transmission gear 322 includes a gear shaft 3221 rotatably connected to the housing frame 2, a continuous toothed ring 3222 surrounding the gear shaft 3221 and cooperating with the drive gear 321, and an intermittent toothed ring 3223 surrounding the gear shaft 3221 and cooperating with the rack 312. In this way, the drive gear 321 can continuously mesh with the continuous toothed ring 3222 when rotating, so as to drive the transmission gear 322 to rotate continuously; at the same time, the intermittent toothed ring 3223 of the transmission gear 322 can intermittently mesh with the rack 312, so as to drive the rack 312 to make linear motion when the intermittent toothed ring 3223 meshes with the rack 312, and remove the driving force on the rack 312 when the intermittent toothed ring 3223 does not mesh with the rack 312. This ensures that the push rod 311 can be driven to push the hinge bracket 112, while also preventing the rack 312 from being continuously driven by the transmission gear 322 and disengaging from the transmission gear 322 or sliding too far, causing structural interference.

[0061] For example, such as Figure 4As shown, the intermittent toothed ring 3223 of the transmission gear 322 may have toothed segments 32231 and smooth segments 32232 arranged circumferentially along the gear shaft 3221; when the toothed segments 32231 of the intermittent toothed ring 3223 face the rack 312, the transmission gear 322 meshes with the rack 312 to drive the push rod 311 to slide; when the smooth segments 32232 of the intermittent toothed ring 3223 face the rack 312, the transmission gear 322 disengages from the rack 312 to remove the driving force on the push rod 311. It is understood that the toothed section 32231 mentioned in this application refers to a region on the gear shaft 3221 where teeth are protruding; the smooth section 32232 mentioned in this application refers to a region on the gear shaft 3221 where no teeth are provided, which can be an arc surface, a curved surface or a plane, and this application will not elaborate further on this.

[0062] Optionally, such as Figures 3 to 6 As shown, the pusher 31 further includes a reset member 313 connected to the pusher rod 311; when the smooth section 32232 of the intermittent toothed ring 3223 faces the rack 312, the pusher rod 311 slides away from the hinge bracket 112 under the action of the reset member 313. Thus, during the forward rotation of the drive motor 21 to release the second pull rope 22, the transmission gear 322 continues to rotate forward under the meshing action of the continuous toothed ring 3222 and the drive gear 321; when the tooth segment 32231 on the transmission gear 322 faces the rack 312, the transmission gear 322 meshes with the rack 312 to drive the push rod 311 to slide towards the hinge bracket 112 until the smooth segment 32232 on the transmission gear 322 faces the rack 312, causing the push rod 311 to slide to the first limit position; at this time, under the action of the reset member 313, the push rod 311 slides away from the hinge bracket 112 to the second limit position; thereafter, when the transmission gear 322 continues to rotate forward, the push rod 311 will slide back and forth between the first limit position and the second limit position.

[0063] Furthermore, during the process of the drive motor 21 reversing to tighten the second pull rope 22, the transmission gear 322 continues to reverse under the meshing action of the continuous toothed ring 3222 and the drive gear 321; when the toothed section 32231 on the transmission gear 322 faces the rack 312, the transmission gear 322 meshes with the rack 312 to drive the push rod 311 to slide away from the hinge bracket 112, until the smooth section 32232 on the transmission gear 322 faces the rack 312. The push rod 311 slides to the second limit position when the rack 312 is stopped. At this time, the push rod 311 is held in the second limit position by the reset member 313 and will not affect the closing position of the hinge bracket 112. That is to say, the transmission gear 322 will not mesh with the rack 312 if it continues to reverse. Unless the transmission gear 322 rotates forward, the tooth segment 32231 on the transmission gear 322 will mesh with the rack 312 again when it faces the rack 312.

[0064] It is worth noting that although the opening and closing speed of the door assembly 3 needs to be controlled to ensure safety during the opening and closing process (i.e., opening or closing the door), the automatic door opening and closing mechanism 1 of this application only needs to control the rotation speed of the drive motor 21 to control the opening and closing speed of the door assembly 3.

[0065] For example, during the opening process of door assembly 3: Figure 5 and Figure 6 As shown, when the drive motor 21 stops rotating, the length of the second pull rope 22 between the drive motor 21 and the hinge bracket 112 remains unchanged, so that the sum of the pulling torques M2 is approximately equal to the gravitational torque M1. At this time, the door assembly 3 stops opening and remains in the suspended position; as Figure 7 and Figure 8 As shown, when the drive motor 21 continues to rotate forward, the length of the second pull rope 22 between the drive motor 21 and the hinge bracket 112 increases, so that the second pulling torque m1 tends to decrease. As the door assembly 3 opens, the length of the first pull rope 12 between the hinge bracket 112 and the spring 13 remains constant. Although the spring 13 is extended to make the first pulling torque m1 tend to increase, the sum of the pulling torques M2 is less than the gravitational torque M1, thus achieving the slow opening of the door assembly 3. In turn, by controlling the forward rotation speed of the drive motor 21, the opening speed of the door assembly 3 can be controlled.

[0066] Similarly, during the closing process, the automatic door opening and closing mechanism 1 of this application only needs to control the reverse rotation speed of the drive motor 21 to control the closing speed of the door assembly 3.

[0067] According to the above embodiments of this application, the number of automatic door opening and closing mechanisms 1 in each door box device can be one or two, to automatically open or close a single door assembly. For example, in one example of this application, two automatic door opening and closing mechanisms 1 can be located on the left and right sides of the door assembly 3 respectively, to cooperate in realizing automatic door opening and closing; or, in another example of this application, an automatic door opening and closing mechanism 1 and a hinge spring system can be arranged on the left and right sides of the door assembly 3 respectively, so that automatic door opening and closing can also be realized through the cooperation of the two, which will not be described in detail in this application.

[0068] It is worth noting that when the door assembly 3 is closed, the door lock assembly 40 is triggered to switch from the unlocked state to the locked state and issue a locking signal to securely lock the door assembly 3. At this time, the pull rope drive system 20 can control the drive motor 21 to stop rotating based on the locking signal so that the door assembly 3 remains in the closed state.

[0069] Furthermore, during the automatic door opening process, in order to accurately detect whether the door assembly 3 has rotated to the open state, such as... Figure 7 As shown, the automatic door opening and closing mechanism 1 of this application may further include a door opening micro switch 50 that can be triggered by the hinge bracket 112 in the open position, for sensing the door opening position of the hinge bracket 112; that is, when the door assembly 3 rotates to the open position, the hinge bracket 112 rotates to the open position and triggers the door opening micro switch 50 to send an open position signal, thereby controlling the drive motor 21 to stop rotating so that the hinge bracket 112 stays in the open position, thereby realizing that the door assembly 3 is kept in the open position.

[0070] Specifically, during the automatic opening and closing process, for safety and intermediate operation considerations, such as... Figure 8 As shown, the automatic door opening and closing mechanism 1 of this application may include one or more hovering microswitches 60 that can be triggered by the hinge bracket 112 in the hovering position, for sensing the hovering position of the hinge bracket 112; that is, when the hinge bracket 112 rotates to the hovering position, the hovering microswitch 60 will be triggered by the hinge bracket 112 to send a hovering signal, thereby controlling the drive motor 21 to stop rotating so that the sum of the pulling torque M2 and the gravitational torque M1 of the door assembly 3 automatically achieve torque balance, thereby realizing the hovering of the door assembly 3. It is understood that the door opening microswitch 50 and the hovering microswitch 60 of this application can be correspondingly installed on the housing frame 2, as long as they can be triggered by the hinge bracket 112 rotated to the door opening position and the hovering position respectively, which will not be described in detail in this application.

[0071] It is worth noting that the drive motor 21 in the rope drive system 20 of this application can be controlled by a control board (not shown in the figure) to rotate forward and backward to loosen or tighten the second rope 22, and the drive motor 21 can be equipped with a Hall sensor (not shown in the figure) to detect the rotational speed of the output shaft, thereby sensing the change in the magnitude of the motor load in order to implement safety precautions.

[0072] Furthermore, due to safety considerations, the automatic door opening and closing speed is relatively slow, while some users may prefer to quickly retrieve or place tableware. Therefore, manual intervention often occurs during the automatic door opening and closing process. For example, if a user manually intervenes during the automatic door opening and closing process, such as by pushing or pulling the door assembly 3, the load force on the drive motor 21 via the second pull cord 22 changes. At this time, the Hall sensor will detect the change in motor speed and thus determine the user's intention to intervene: when the direction of user intervention is consistent with the direction of the motor driving the door opening and closing (i.e., positive intervention), it is equivalent to increasing the speed of the drive motor 21, which can be controlled to speed up the opening and closing of the door; when the direction of user intervention is inconsistent with the direction of the motor driving the door opening and closing (i.e., reverse intervention), it is equivalent to decreasing the speed of the drive motor 21, which can be controlled to slow down the opening and closing of the door.

[0073] In other words, when the user intervenes in the same direction, the Hall sensor will detect an increase in rotation speed; when the user intervenes in the opposite direction, the Hall sensor will detect a decrease in rotation speed. Based on this, this application can quickly identify the user's intervention intention while ensuring safety, and react accordingly: if the intervention is in the same direction, the original action logic continues; if the intervention is in the opposite direction, the original action stops, and then the reverse action logic is implemented. The action logic is relatively simple, so as to improve the intelligent experience and enhance the user experience.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. An automatic door opening and closing mechanism, used to be installed between the box frame and the door assembly, characterized in that, include: A hinge spring system includes a hinge assembly for rotatably mounting the door assembly to the housing frame, a first pull cord connected to the hinge assembly, and a spring connected to the housing frame, the spring being connected to the first pull cord for applying a first pulling torque less than the gravitational torque of the door assembly to the hinge assembly via the first pull cord. and A pull-cord drive system includes a drive motor and a second pull cord. One end of the second pull cord is connected to the drive motor, and the other end of the second pull cord is connected to the hinge assembly. The system is used to apply a second pulling torque to the hinge assembly through the second pull cord, which is opposite to the direction of the gravitational torque of the door assembly. When the second pull cord is tightened under the drive of the drive motor, the second pulling torque applied by the second pull cord increases so that the sum of the first pulling torque and the second pulling torque is greater than the gravitational torque of the door assembly, thus automatically closing the door; when the second pull cord is released under the drive of the drive motor, the second pulling torque applied by the second pull cord decreases so that the sum of the first pulling torque and the second pulling torque is less than the gravitational torque of the door assembly, thus automatically opening the door.

2. The automatic door opening and closing mechanism according to claim 1, characterized in that, The second pull rope portion is wound around the output shaft of the drive motor to release or retract the second pull rope by the forward and reverse rotation of the drive motor.

3. The automatic door opening and closing mechanism according to claim 2, characterized in that, The hinge spring system further includes a guide roller for mounting on the housing frame, the guide roller being arranged adjacent to the drive motor, and the first pull cord extending from the spring around the guide roller to the hinge assembly.

4. The automatic door opening and closing mechanism according to any one of claims 1 to 3, characterized in that, The hinge assembly includes a hinge base for fixed connection with the box frame, a hinge bracket for fixed connection with the door assembly, and a pivot for rotatably connecting the hinge bracket to the hinge base; the two ends of the first pull rope are respectively limited and connected to the hinge bracket and the free end of the spring.

5. The automatic door opening and closing mechanism according to claim 4, characterized in that, It also includes an auxiliary door opening system, which includes a pusher slidably mounted on the housing frame and a transmission mechanism disposed between the drive motor and the pusher. When the drive motor rotates forward to release the second pull rope, the pusher slides toward the hinge bracket under the transmission action of the transmission mechanism to push the hinge bracket, thereby applying a pushing torque to the door assembly in the same direction as the gravitational torque.

6. The automatic door opening and closing mechanism according to claim 5, characterized in that, The transmission mechanism includes a drive gear connected to the output shaft of the drive motor and a transmission gear meshing with the drive gear; the pushing member includes a pushing rod and a rack disposed on the pushing rod and meshing with the transmission gear.

7. The automatic door opening and closing mechanism according to claim 6, characterized in that, The transmission gear includes a gear shaft for rotatably connecting to the housing frame, a continuous toothed ring surrounding the gear shaft and engaging with the drive gear, and a discontinuous toothed ring surrounding the gear shaft and engaging with the rack.

8. The automatic door opening and closing mechanism according to claim 7, characterized in that, The intermittent toothed ring has tooth segments and smooth segments arranged circumferentially along the gear shaft; the pusher further includes a reset member connected to the pusher rod, and when the smooth segment of the intermittent toothed ring faces the rack, the pusher rod slides away from the hinge bracket under the action of the reset member.

9. The automatic door opening and closing mechanism according to any one of claims 1 to 3, characterized in that, The drive motor has a built-in Hall sensor; the automatic door opening and closing mechanism further includes a door lock assembly disposed between the door assembly and the housing frame, a hovering micro switch activated by the hinge assembly in the hovering position, and an opening micro switch activated by the hinge assembly in the open position; the door lock assembly has a lock state and an unlock state that can be automatically switched between each other, and issues a closing completion signal when switching from the unlock state to the lock state.

10. A door-mounted equipment, characterized in that, include: Box frame; Door components; as well as The automatic door opening and closing mechanism as described in any one of claims 1 to 9, wherein the automatic door opening and closing mechanism is disposed between the housing frame and the door assembly.

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