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 assembly, a gravity balance assembly and a lead screw driving system. The gravity balance assembly comprises a pull rope, a spring and a sliding connecting piece, and the sliding connecting piece is connected with the pull rope and the spring and used for applying tension torque opposite to the gravity torque of the door body assembly to the door body assembly through the pull rope under the action of the spring. The lead screw driving system comprises a driving motor and a lead screw in driving connection with the driving motor, the lead screw and the spring are coaxially arranged, and the lead screw is in threaded connection with the sliding connecting piece and used for linearly moving the sliding connecting piece under the driving of the driving motor so as to increase or reduce the tension torque applied to the door body assembly.

Description

Technical Field

[0001] 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

[0002] 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

[0003] 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.

[0004] 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:

[0005] A hinge assembly for connecting the door assembly and the housing frame, so that the door assembly can rotate relative to the housing frame to open or close;

[0006] A gravity balancing assembly includes a pull cord for connecting to the door assembly, a spring for connecting to the housing frame, and a sliding connector slidably disposed on the housing frame. The sliding connector connects the pull cord and the spring, respectively, and applies a pulling torque to the door assembly via the pull cord under the action of the spring, the torque being opposite to the gravitational torque of the door assembly.

[0007] A lead screw drive system includes a drive motor and a lead screw driven and connected to the drive motor. The lead screw is coaxially arranged with the spring and threadedly connected to the sliding connector. The system is used to linearly move the sliding connector under the drive of the drive motor to increase or decrease the tensile torque applied to the door assembly.

[0008] According to one embodiment of this application, the sliding connector includes a nut seat fitted onto the lead screw, a threaded connector extending protruding from the nut seat toward the spring, and a hook portion fixedly connected to the nut seat; the threaded connector is screwed into one end of the spring, and one end of the pull rope is hooked into the hook portion.

[0009] According to one embodiment of this application, the sliding connector further includes a ball bearing that is rotatably protruding from the nut seat for abutting against the housing frame.

[0010] According to one embodiment of this application, the nut seat has a threaded hole that matches the lead screw, a mounting cavity for receiving the ball, and a notch located on the side of the nut seat facing the housing frame and communicating with the mounting cavity. The width of the notch is smaller than the diameter of the ball, so that a portion of the ball received within the mounting cavity extends out of the notch.

[0011] According to one embodiment of this application, the screw connector is integrally connected to the nut seat; the hook portion is detachably fixed to the nut seat.

[0012] According to one embodiment of this application, the hook portion includes a pressure plate screwed to the nut seat and a hook arm extending curvedly from the pressure plate toward the nut seat; when the pressure plate is fixed to the nut seat, the pressure plate blocks the opening of the mounting cavity, and the nut seat blocks the hook opening of the hook arm.

[0013] 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 pull rope are respectively limited and connected to the hinge bracket and the sliding connector; the spring is a tension spring, one end of the tension spring is fixedly connected to the sliding connector, and the other end of the tension spring is adjustablely connected to the box frame.

[0014] According to one embodiment of this application, the gravity balancing assembly further includes a roller assembly for mounting on the housing frame. The roller assembly includes a guide roller arranged adjacent to the drive motor and a fixed roller arranged adjacent to the hinge bracket. The pull rope passes from the sliding connector around the guide roller and the fixed roller to connect to the hinge bracket.

[0015] According to one embodiment of this application, the automatic door opening and closing mechanism further includes a door lock system for releasably locking the door assembly to the housing frame; the door lock system has a first state and a second state, and the door lock force when the door lock system is in the first state is greater than the door lock force when the door lock system is in the second state.

[0016] According to another aspect of this application, one embodiment of this application further provides a door box device, including:

[0017] Box frame;

[0018] Door components; and

[0019] In any of the above-described automatic door opening and closing mechanisms, the hinge base and hinge bracket are respectively fixedly connected to the box frame and the door assembly.

[0020] In summary, the screw drive system of this application only requires a small force to be applied to the spring to change the magnitude of the tension torque, thereby disrupting the torque balance and realizing the automatic opening and closing of the door box device. Therefore, the drive motor in the screw drive system of this application does not require a large power, but only needs to provide a small driving force to disrupt the hovering balance. The requirements for the drive motor are low, which helps to reduce costs and facilitates implementation.

[0021] Furthermore, since the lead screw in the lead screw drive system of this application is coaxially arranged with the spring in the gravity balance component, the force applied by the lead screw to the spring through the sliding connector is collinear with the axis of the spring, making the extension and shortening movements of the spring smoother and saving space in the height direction of the base frame, thus enhancing feasibility. At the same time, the door box device of this application retains the hinge spring system composed of the gravity balance component and the hinge component, so that manual opening and closing with a hovering function can still be completed when the drive motor in the lead screw drive system is not in operation; that is, the automatic door opening and closing mechanism of this application can meet both manual and fully automatic door opening and closing needs. Attached Figure Description

[0022] 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;

[0023] 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;

[0024] Figure 2 This is a perspective view of a door box device according to an embodiment of this application;

[0025] Figure 3 A schematic diagram of the structure of the automatic door opening and closing mechanism in the door box device according to the above embodiments of this application is shown;

[0026] Figure 4An enlarged schematic diagram of the sliding connector in the automatic door opening and closing mechanism according to the above embodiments of this application is shown;

[0027] Figure 5 A schematic diagram of the structure of the nut seat and the threaded joint in the sliding connector according to the above embodiments of this application is shown;

[0028] Figure 6 A schematic diagram of the hook portion in the sliding connector according to the above embodiments of this application is shown;

[0029] Figure 7 A schematic diagram showing the state of the door box device according to the above embodiments of this application when the door is closed is shown;

[0030] Figure 8 A schematic diagram showing the state of the door box device according to the above embodiment of this application when the door is opened is shown.

[0031] Explanation of main component symbols: 1. Automatic door opening and closing mechanism; 10. Gravity balance assembly; 11. Hinge assembly; 111. Hinge base; 112. Hinge bracket; 113. Rotating shaft; 12. Pull cord; 13. Spring; 130. Tension spring; 14. Sliding connector; 141. Nut seat; 1411. Threaded hole; 1412. Mounting cavity; 1413. Notch; 142. Threaded connector; 143. Hook part; 1431. Pressure plate; 1432. Hook arm; 144. Ball bearing; 15. Roller assembly; 151. Guide roller; 152. Fixed roller; 20. Screw drive system; 21. Drive motor; 22. Screw; 23. Limiting rib; 30. Door lock system; 2. Box frame; 3. Door assembly.

[0032] 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

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] More specifically, such as Figures 3 to 6As shown, the automatic door opening and closing mechanism 1 may include a hinge assembly 11, a gravity balancing assembly 10, and a screw drive system 20. The hinge assembly 11 connects the door assembly 3 and the housing frame 2, allowing the door assembly 3 to rotate relative to the housing frame 2 to open or close. The gravity balancing assembly 10 includes a pull cord 12 for connecting to the door assembly 3, a spring 13 for connecting to the housing frame 2, and a sliding connector 14 slidably disposed on the housing frame 2; the sliding connector 14 connects the pull cord 12 and the spring 13 respectively, and applies a pulling torque M2 to the door assembly 3 through the pull cord 12 under the action of the spring 13, in the opposite direction to the gravitational torque M1 of the door assembly 3. The lead screw drive system 20 includes a drive motor 21 and a lead screw 22 driven by the drive motor 21. The lead screw 22 is coaxially arranged with the spring 13 and is threadedly connected to the sliding connector 14. It is used to linearly move the sliding connector 14 under the drive of the drive motor 21 to increase or decrease the tensile torque applied to the door assembly 3.

[0043] Specifically, the sliding connector 14, under the action of the spring 13, can apply a pulling torque M2 to the door assembly 3 via the pull rope 12, which balances the gravitational torque M1 of the door assembly 3, thereby achieving torque balance and allowing the door assembly 3 to be suspended relative to the housing frame 2. The lead screw 22, driven by the drive motor 21, can linearly move the sliding connector 14 to increase or decrease the pulling torque applied to the door assembly 3, thus breaking the torque balance and achieving automatic opening and closing of the door at all angles.

[0044] In other words, when the door assembly 3 is suspended relative to the box frame 2, the pulling torque M2 exerted by the pull rope 12 on the door assembly 3 under the action of the spring 13 is approximately equal to the gravitational torque M1 of the door assembly 3, thus achieving a torque balance state through friction. In this way, as... Figure 7 As shown, when the door needs to be closed, the screw drive system 20 only needs to drive the sliding connector 14 to make linear motion to pull the pull rope 12, which can apply additional tension to the pull rope 12 to increase the pulling torque M2, making the pulling torque M2 greater than the gravitational torque M1, thereby realizing automatic door closing; Figure 8As shown, when the door needs to be opened, the screw drive system 20 only needs to drive the sliding connector 14 to make a linear motion to pull the spring 13, which can apply additional tension to the spring 13 to reduce the tension torque M2, making the tension torque M2 less than the gravitational torque M1, thereby realizing automatic door opening. It is understood that in other examples of this application, the sliding connector 14, under the action of the spring 13, can apply a tension torque M2 to the door assembly 3 through the pull rope 12, which can be greater than or less than the gravitational torque M1 of the door assembly 3 to partially offset it. It is still possible to change the magnitude of the tension torque M2 with the help of the screw drive system 20 to automatically open and close the door. This application will not elaborate on this further.

[0045] It is worth noting that since the screw drive system 20 of this application only needs to apply a linear driving force to the sliding connector 14 in the gravity balance component 10, the screw drive system 20 of this application can be integrated into the housing frame 2, avoiding being seen by the user during use, resulting in a simple and beautiful appearance and enhancing the sense of intelligent technology. At the same time, the door housing device of this application retains the gravity balance component 10 so that manual opening and closing of the door with the hovering function can still be completed when the drive motor 21 in the screw drive system 20 is not in operation; that is to say, the automatic door opening and closing mechanism 1 of this application can meet the needs of both manual and fully automatic door opening and closing.

[0046] Specifically, since the lead screw 22 in the lead screw drive system 20 of this application is coaxially arranged with the spring 13 in the gravity balance assembly 10, the force exerted by the lead screw 22 on the spring 13 or the pull rope 12 through the sliding connector 14 is collinear with the axis of the spring 13. This prevents the spring 13 from deflecting during extension and retraction, thus avoiding friction or interference with other parts. This makes the extension and retraction of the spring 13 smoother and more feasible. It is understood that compared to the parallel arrangement of the lead screw 22 and the spring 13, the automatic door opening and closing mechanism 1 of this application also saves space in the height direction of the base frame 2, making it more adaptable.

[0047] Furthermore, since the screw drive system 20 of this application only needs to apply a small pulling force to the pull rope 12 or the spring 13 to change the magnitude of the pulling torque M2, thereby disrupting the torque balance state and realizing the automatic opening and closing of the door box device, the drive motor 21 in the screw drive system 20 of this application does not need to have a large power. It only needs to provide a small driving force to disrupt the hovering balance. The requirements for the drive motor are low, which helps to reduce costs and facilitates implementation.

[0048] For example, such as Figures 3 to 6As shown, the sliding connector 14 may include a nut seat 141 fitted onto the lead screw 22, a threaded connector 142 extending protruding from the nut seat 141 toward the spring 13, and a hook portion 143 fixedly connected to the nut seat 141. The threaded connector 142 is screwed into one end of the spring 13 to securely connect the spring 13 to the sliding connector 14. One end of the pull rope 12 is hooked into the hook portion 143 to limit the connection between the pull rope 12 and the sliding connector 14. Thus, when the lead screw 22 rotates under the drive of the drive motor 21, the sliding connector 14 slides along the lead screw 22 to pull the pull rope 12 or the spring 13, causing the pulling torque applied by the pull rope 12 to the door assembly 3 to increase or decrease, thereby breaking the torque balance and realizing the automatic opening and closing of the door box device.

[0049] It is worth noting that although the spring 13 of this application can, to a certain extent, limit the rotation of the sliding connector 14 with the lead screw 22, thereby converting the rotational motion of the lead screw 22 into the linear motion of the sliding connector 14, in order to further improve the stability of motion conversion, the housing frame 2 of this application can limit the rotation of the sliding connector 14 through a linear groove, so that the sliding connector 14 can only perform linear sliding motion relative to the housing frame 2. However, the sliding connector 14 will generate sliding friction when sliding relative to the housing frame 2, which is prone to noise; in order to solve this problem, such as Figure 2 and Figure 3 As shown, the sliding connector 14 of this application may further include a ball bearing 144, which is rotatably protruding from the nut seat 141 and abuts against the housing frame 2, so that the friction between the sliding connector 14 and the housing frame 2 when sliding along the lead screw 22 is rolling friction, which helps to reduce the friction between the sliding connector 14 and the housing frame 2, reduce sliding noise, and improve the operational stability of the automatic door opening and closing mechanism 1.

[0050] Optionally, such as Figure 4 and Figure 5 As shown, the nut seat 141 has a threaded hole 1411 that matches the lead screw 22, a mounting cavity 1412 that accommodates the ball 144, and a notch 1413 located on the side of the nut seat 141 facing the housing frame 2 and communicating with the mounting cavity 1412. The width of the notch 1413 is smaller than the diameter of the ball 144, so that the ball 144, which is accommodated in the mounting cavity 1412, extends out of the notch 1413, so that it can roll to contact the housing frame 2, and the sliding connector 14 rolls against the housing frame 2.

[0051] Optionally, such as Figures 3 to 6As shown, the screw connector 142 is integrally connected to the nut seat 141; the hook portion 143 is detachably fixed to the nut seat 141, so that while binding the pull rope 12 and the spring 13 together to the lead screw 22, the easily damaged hook portion 143 can be easily replaced, which helps to reduce maintenance costs. It is understood that the screw connector 142 and the hook portion 143 have through holes coaxial with the threaded hole 1411, so that the lead screw 22 passes through the hook portion 143, the nut seat 141, and the screw connector 142.

[0052] Furthermore, the external thread of the screw connector 142 is coaxially arranged with the internal thread of the threaded hole 1411 to ensure that the lead screw 22 and the spring 13 are coaxially arranged.

[0053] Optionally, such as Figure 3 and Figure 6 As shown, the hook portion 143 includes a pressure plate 1431 that is screwed to the nut seat 141 and a hook arm 1432 that extends curvedly from the pressure plate 1431 toward the nut seat 141. When the pressure plate 1431 is fixed to the nut seat 141, the pressure plate 1431 blocks the opening of the mounting cavity 1412 to prevent the ball 144 from coming out of the mounting cavity 1412. The nut seat 141 also blocks the hook opening of the hook arm 1432 to prevent the pull rope 12 from detaching from the hook arm 1432.

[0054] According to the above embodiments of this application, as Figure 3 , Figure 7 as well as Figure 8 As shown, the spring 13 in the gravity balance assembly 10 can be, but is not limited to, a tension spring 130. One end of the tension spring 130 is fixedly connected to the sliding connector 14, and the other end of the tension spring 130 is adjustablely connected to the housing frame 2. Thus, the pull rope 12 applies a tensile torque to the door assembly 3 under the tension of the tension spring 130. When the drive motor 21 operates to drive the lead screw 22 to rotate, the sliding connector 14 moves along the lead screw 22 under its action, causing a positional change in one end of the tension spring 130. This applies a force that alters the magnitude of the tensile torque to the tension spring 130 and the pull rope 12, disrupting the original torque balance and achieving automatic door opening and closing. It is understood that in other examples of this application, the spring 13 can also be implemented as a compression spring. In this case, the pull rope 12 can apply a tensile torque to the door assembly 3 under the pressure of the compression spring, achieving torque balance. This application will not elaborate further on this aspect.

[0055] It is worth noting that the other end of the tension spring 130 in this application can be connected to the housing frame 2 via an adjusting screw. Thus, when the adjusting screw is rotated, the position of the other end of the tension spring 130 will change, moving away from or closer to the sliding connector 14, thereby altering the preload tension of the tension spring 130 to adapt to changes in the weight of the door assembly 3, thus meeting the suspension requirements for doors of different weights. In other words, for door assemblies 3 of different weights, the automatic door opening and closing mechanism 1 of this application only needs to adjust the preload tension of the tension spring 130 via the adjusting screw to meet the torque balance requirements for suspension of doors of different weights. Furthermore, after adjusting to accommodate doors of different weights, the screw drive system 20 can still achieve automatic opening and closing of the door at all angles. It is understandable that the elasticity of the tension spring 130 will decrease after a period of use. At this time, the automatic door opening and closing mechanism 1 of this application can also adjust the preload tension of the tension spring 130 via the adjusting screw to still meet the torque balance requirements for suspension of the door.

[0056] Optionally, such as Figure 2 and Figure 3 As shown, the hinge assembly 11 includes a hinge base 111 fixedly connected to the box frame 2, a hinge bracket 112 fixedly connected to the door assembly 3, and a pivot 113 rotatably connecting the hinge bracket 112 to the hinge base 111, such that the door assembly 3 rotates around the pivot 113 to open or close the opening of the box frame 2.

[0057] Optionally, such as Figure 2 and 3 As shown, the two ends of the pull rope 12 are respectively limited and connected to the spring 13 and the hinge bracket 112, so that the pull rope 12 is indirectly connected to the door assembly 3 through the hinge bracket 112, which facilitates the application of a pulling torque to the door assembly 3. It is understood that the limiting connection mentioned in this application may include, but is not limited to, fixed connection, sleeve connection, hook connection and other connection methods, as long as the spring 13 can apply a pulling torque to the door assembly 3 through the pull rope 12. This application will not elaborate on this further.

[0058] It is worth noting that during the opening and closing of the door, such as Figure 7 and Figure 8 As shown, the hinge bracket 112 rotates around the pivot 113 along with the door assembly 3, causing the force exerted by the pull rope 12 on the sliding connector 14 to be out of sync with the axis of the spring 13. This results in the direction of the tension force exerted by the pull rope 12 on the sliding connector 14 being different from the extension direction of the lead screw 22, causing the lead screw 22 to be subjected to a deviated tension, which can easily damage the lead screw 22. To solve this problem, as... Figure 3 , Figure 7 as well as Figure 8As shown, the gravity balancing assembly 10 of this application may further include a roller assembly 15. The roller assembly 15 may include a guide roller 151 arranged adjacent to the drive motor 21 and a fixed roller 152 arranged adjacent to the hinge bracket 112. The pull rope 12 passes successively over the guide roller 151 and the fixed roller 152 from the sliding connector 14 to connect to the hinge bracket 112. In this way, the pull rope 12 can be connected to the sliding connector 14 along the extension direction of the lead screw 22 between the sliding connector 14 and the guide roller 151, ensuring that the sliding connector 14 is only subjected to the same force as the extension direction of the lead screw 22, preventing the lead screw 22 from being damaged. At the same time, the pull rope 12 can increase the tension arm of the pull rope 12 after passing over the fixed roller 152, which helps to reduce the elasticity requirement of the spring 13.

[0059] According to the above embodiments of this application, as Figure 2 , Figure 7 as well as Figure 8 As shown, the automatic door opening and closing mechanism 1 may further include a door lock system 30 for releasably locking the door assembly 3 to the housing frame 2. The door lock system 30 has a first state and a second state, and the door lock force when the door lock system 30 is in the first state is greater than the door lock force when the door lock system 30 is in the second state. Thus, when it is necessary to open the door, the door lock system 30 will switch from the first state to the second state to reduce the door lock force; at this time, the door lock is unlocked, the lock hook disengages from the door lock, and the signal change during the switching process will trigger the drive motor 21 to rotate forward, thereby driving the sliding connector 14 to move in the direction of stretching the tension spring 130, so that the tension torque M2 on the door assembly 3 tends to decrease, disrupting the torque balance, thereby realizing automatic door opening.

[0060] Similarly, when the door needs to be closed, the closing signal triggers the drive motor 21 to rotate in the opposite direction, causing the sliding connector 14 to move in the direction of shortening the tension spring 130. This causes the tension torque M2 on the door assembly 3 to tend to increase, disrupting the torque balance and thus achieving automatic closing. It is understood that when the door assembly 3 is about to reach the closed position (e.g., the opening angle is approximately 0.5°), the lock hook in the door lock system 30 will engage the door lock to trigger the door lock signal. Afterwards, the control board will control the door lock system 30 to switch from the second state to the first state, pulling the lock hook into the door lock to complete the locking process.

[0061] It is worth noting that, such as Figure 7As shown, when the door box device completes closing, the door assembly 3 is fixed relative to the box frame 2, preventing the pull rope 12 from being pulled relative to the door assembly 3 and the box frame 2. This restricts the sliding connector 14 from continuing to move towards the tension spring 130, thus limiting the closing limit position of the sliding connector 14. Conversely, when the door box device completes opening, to limit the opening limit position of the sliding connector 14 and prevent it from contacting or impacting the drive motor 21, as shown... Figure 2 and Figure 8 As shown, the lead screw drive system 20 of this application may further include a limiting rib 23 protruding from the box frame 2. The limiting rib 23 is arranged adjacent to the drive motor 21 and is used to abut against the sliding connector 14 when the door assembly 3 is opened to the maximum angle, so as to limit the sliding connector 14 from continuing to move away from the tension spring 130 and prevent the tension spring 130 from being overstretched.

[0062] 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 component. 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 component 3 respectively, to cooperate in achieving automatic door opening and closing; or, in another example of this application, an automatic door opening and closing mechanism 1 and a gravity balancing component 10 can be arranged on the left and right sides of the door component 3 respectively, so that automatic door opening and closing can also be achieved through the cooperation of the two, which will not be described in detail in this application.

[0063] It is worth noting that in the lead screw drive system 20 of this application, the drive motor 21 can be controlled to rotate forward and backward by a control board (not shown in the figure) to drive the sliding connector 14 to reciprocate linearly along the lead screw 22. Furthermore, the drive motor 21 can have a built-in Hall sensor (not shown in the figure) to detect the rotational speed of the lead screw 22, thereby sensing the magnitude of the motor load and implementing safety precautions. It is understood that this application defines the forward rotation of the drive motor 21 as the direction of rotation that stretches the tension spring 130, and the reverse rotation of the drive motor 21 as the direction of rotation that shortens the tension spring 130.

[0064] For example, to prevent safety issues such as increased screw load caused by pinching a hand when closing the door, the Hall sensor of this application can first control the drive motor 21 to stop for a first predetermined time n1 when it senses that the motor load has increased and the speed has slowed down when the door is about to be closed, so as to give the user time to release the handle. Then, it can control the drive motor 21 to increase the output power for a second predetermined time n2 to overcome the resistance torque until the door lock signal is triggered to complete the closing, thereby safely realizing automatic closing at all angles.

[0065] Furthermore, for safety and operational considerations during the automatic door opening and closing process, the automatic door opening and closing mechanism 1 of this application can be set with one or more hovering positions. The drive motor 21 is controlled to move and stop through program timing. When the drive motor 21 stops moving, the extra torque disappears, and the torque balance is restored to achieve hovering.

[0066] It is worth noting that since the drive motor 21 has a built-in Hall sensor, during the automatic door opening and closing process, if the user intervenes manually, such as by pushing or pulling the door assembly 3, the load force on the lead screw 22 through the pull rope 12 of the door assembly 3 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 the user's intervention is consistent with the direction of the lead screw's action to open and close the door, that is, when the intervention is positive, it is equivalent to reducing the load force on the lead screw 22, and the speed of the drive motor 21 can be controlled to increase, so as to speed up the opening and closing of the door; when the direction of the user's intervention is inconsistent with the direction of the lead screw's action to open and close the door, that is, when the intervention is negative, it is equivalent to increasing the load force on the lead screw 22, and the speed of the drive motor 21 can be controlled to decrease, so as to slow down the opening and closing of the door.

[0067] 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.

[0068] 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.

[0069] 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 assembly for connecting the door assembly and the housing frame, so that the door assembly can rotate relative to the housing frame to open or close; A gravity balancing assembly includes a pull rope for connecting to the door assembly, a spring for connecting to the box frame, and a sliding connector for being slidably disposed on the box frame. The sliding connector connects the pull rope and the spring respectively, and is used to apply a pulling torque to the door assembly through the pull rope under the action of the spring, which is opposite to the direction of the gravity torque of the door assembly. as well as A lead screw drive system includes a drive motor and a lead screw driven and connected to the drive motor. The lead screw is coaxially arranged with the spring and threadedly connected to the sliding connector. The system is used to linearly move the sliding connector under the drive of the drive motor to increase or decrease the tensile torque applied to the door assembly.

2. The automatic door opening and closing mechanism according to claim 1, characterized in that, The sliding connector includes a nut seat fitted onto the lead screw, a threaded connector extending protruding from the nut seat toward the spring, and a hook portion fixedly connected to the nut seat; the threaded connector is screwed into one end of the spring, and one end of the pull rope is hooked into the hook portion.

3. The automatic door opening and closing mechanism according to claim 2, characterized in that, The sliding connector further includes ball bearings that are rotatably protruding from the nut seat to abut against the housing frame.

4. The automatic door opening and closing mechanism according to claim 3, characterized in that, The nut seat has a threaded hole that matches the lead screw, a mounting cavity for receiving the ball, and a notch located on the side of the nut seat facing the housing frame and communicating with the mounting cavity. The width of the notch is smaller than the diameter of the ball, so that the portion of the ball received in the mounting cavity extends out of the notch.

5. The automatic door opening and closing mechanism according to claim 4, characterized in that, The screw connector is integrally connected to the nut seat; the hook portion is detachably fixed to the nut seat.

6. The automatic door opening and closing mechanism according to claim 5, characterized in that, The hook portion includes a pressure plate that is screwed to the nut seat and a hook arm that extends curvedly from the pressure plate toward the nut seat; when the pressure plate is fixed to the nut seat, the pressure plate blocks the opening of the mounting cavity, and the nut seat blocks the hook opening of the hook arm.

7. The automatic door opening and closing mechanism according to any one of claims 1 to 6, 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 pull cord are respectively limited and connected to the hinge bracket and the sliding connector; the spring is a tension spring, one end of the tension spring is fixedly connected to the sliding connector, and the other end of the tension spring is adjustablely connected to the box frame.

8. The automatic door opening and closing mechanism according to claim 7, characterized in that, The gravity balancing assembly further includes a roller assembly for mounting on the housing frame. The roller assembly includes a guide roller arranged adjacent to the drive motor and a fixed roller arranged adjacent to the hinge bracket. The pull rope passes from the sliding connector, successively around the guide roller and the fixed roller, to connect to the hinge bracket.

9. The automatic door opening and closing mechanism according to any one of claims 1 to 6, characterized in that, It also includes a door lock system for releasably locking the door assembly to the housing frame; the door lock system has a first state and a second state, and the door lock force when the door lock system is in the first state is greater than the door lock force when the door lock system is in the second state.

10. A door-mounted equipment, characterized in that, include: Box frame; Door components; as well as In the automatic door opening and closing mechanism as described in any one of claims 1 to 9, the hinge base and hinge bracket in the automatic door opening and closing mechanism are respectively fixedly connected to the box frame and the door assembly.

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