Door box equipment

Abstract

The utility model relates to door box equipment which can realize full-angle automatic door opening and closing and improve user experience. The door box device comprises a box body frame; the door body assembly comprises a door main body, a linear driving mechanism mounted on the door main body and a balancing weight which is arranged on the door main body in a sliding manner and is in driving connection with the linear driving mechanism; the hinge spring assembly comprises a hinge assembly, a pull rope and a spring, the hinge assembly enables the door body assembly to be rotatably installed on the box body frame, the pull rope is connected with the door body assembly, the spring is connected with the box body frame, and the spring is connected to the pull rope and used for applying tension moment opposite to the gravity moment of the door body assembly to the door body assembly; when the balancing weight is driven by the linear driving mechanism to slide relative to the door body, the gravity center position of the door body assembly is adjusted, so that the gravity moment of the door body assembly is larger than, equal to or smaller than the tension moment applied to the door body assembly by the hinge spring assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of home appliances, in particular to a door box equipment. BACKGROUND

[0002] Door box equipment such as embedded dishwashers is a more commonly used household appliance at present, and in general, the automatic opening and closing of the door of the door box equipment is realized by a push rod mechanism on the top of the equipment pushing and pulling the door body. However, on the one hand, after the push rod mechanism pushes out the door body, the push rod is too long, affecting the appearance; on the other hand, the existing push rod mechanism is limited by the form of the push rod and can only realize automatic opening and closing of the door within a small angle range, and the remaining angle still needs to be completed manually by the user, and when manually opening and closing the door, a large door lock force often needs to be overcome, resulting in poor user experience. SUMMARY

[0003] Therefore, it is necessary to solve the problems of the existing push rod mechanism that can only realize automatic opening and closing of the door within a small angle range and poor user experience, and the utility model provides a door box equipment which can realize automatic opening and closing of the door within a full angle and improve user experience.

[0004] In an embodiment of the present application, the utility model provides a door box equipment, which comprises:

[0005] a box body frame;

[0006] a door body assembly comprising a door body, a linear drive mechanism mounted on the door body, and a counterweight slidably arranged on the door body and drivingly connected with the linear drive mechanism; and

[0007] a hinge spring assembly comprising a hinge assembly rotatably mounting the door body assembly on the box body frame, a pull rope connected with the door body assembly, and a spring connected with the box body frame, the spring being connected with the pull rope and used for exerting a tension torque on the door body assembly in a direction opposite to the gravitational torque of the door body assembly;

[0008] When the counterweight slides relative to the door body under the driving of the linear drive mechanism, the center of gravity of the door body assembly is adjusted so that the gravitational torque of the door body assembly is greater than, equal to, or less than the tension torque exerted by the hinge spring assembly on the door body assembly.

[0009] According to an embodiment of the present application, the hinge assembly comprises a hinge base fixedly connected with the box body frame, a hinge bracket fixedly connected with the door body, and a rotating shaft rotatably connecting the hinge bracket with the hinge base; both ends of the pull rope are limitingly connected with the hinge bracket and the spring, respectively.

[0010] According to one embodiment of the present application, the door body has an open door position, a hovering position and a close door position arranged in sequence along the sliding direction of the counterweight; wherein the distance between the open door position and the rotation shaft is greater than the distance between the hovering position and the rotation shaft, and the distance between the close door position and the rotation shaft is less than the distance between the hovering position and the rotation shaft.

[0011] According to one embodiment of the present application, when the counterweight slides to the hovering position under the driving of the linear driving mechanism, the gravity moment of the door body assembly and the pulling moment of the hinge spring assembly applied to the door body assembly are in moment balance; when the counterweight slides from the hovering position to the open door position or the close door position under the driving of the linear driving mechanism, the gravity moment of the door body assembly correspondingly increases or decreases to break the moment balance.

[0012] According to one embodiment of the present application, the counterweight slides along the radial direction of the rotation shaft.

[0013] According to one embodiment of the present application, the hinge spring system further comprises a roller assembly installed on the cabinet frame, the roller assembly is installed on the cabinet frame and arranged between the spring and the hinge support, the pull rope passes through the roller assembly, so that the pulling direction of the pull rope applied to the spring is always consistent with the axial direction of the spring.

[0014] According to one embodiment of the present application, the roller assembly comprises an adjusting roller arranged adjacent to the axis of the spring and a fixed roller arranged adjacent to the hinge support; the pull rope passes through the adjusting roller and the fixed roller in sequence from the spring to extend to the hinge support.

[0015] According to one embodiment of the present application, the linear driving mechanism comprises a driving motor and a screw rod connected with the driving motor; the counterweight has a threaded hole matched with the screw rod to be threadedly connected with the screw rod.

[0016] According to one embodiment of the present application, the door body assembly further comprises a guide column fixed to the door body and arranged in parallel with the screw rod; the counterweight further has a guide hole matched with the guide column to be slidably sleeved on the guide column.

[0017] According to one embodiment of the present application, the door body assembly further comprises an electronic gyroscope fixed to the counterweight.

[0018] In summary, when the door needs to be closed, the door assembly of the present application only needs to drive the counterweight to move through the linear drive mechanism to change the center of gravity of the door assembly, so that the gravitational moment of the door assembly is less than the pulling moment exerted on the door assembly by the hinge spring assembly, to achieve automatic closing of the door; when the door needs to be opened, the door assembly of the present application only needs to drive the counterweight to move through the linear drive mechanism to change the center of gravity of the door assembly, so that the gravitational moment of the door assembly is greater than the pulling moment exerted on the door assembly by the hinge spring assembly, to achieve automatic opening of the door. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1A A curve diagram showing the pulling moment exerted by the hinge spring system and the gravitational moment of the door assembly varying with the door opening angle;

[0020] Figure 1B A curve diagram showing the ratio between the pulling moment exerted by the hinge spring system and the gravitational moment of the door assembly varying with the door opening angle;

[0021] Figure 2 A perspective view of a door box device according to an embodiment of the present application;

[0022] Figure 3 A state diagram showing the door assembly in the door box device according to the above embodiment of the present application, in which the counterweight is located at the door opening position;

[0023] Figure 4 An enlarged diagram showing the counterweight in the door assembly according to the above embodiment of the present application;

[0024] Figure 5 A state diagram showing the counterweight in the door assembly according to the above embodiment of the present application, in which the counterweight is located at the hovering position;

[0025] Figure 6 A state diagram showing the counterweight in the door assembly according to the above embodiment of the present application, in which the counterweight is located at the door closing position;

[0026] Figure 7 A state diagram showing the door assembly in the door box device according to the above embodiment of the present application, in which the door assembly is in the open state;

[0027] Figure 8 A state diagram showing the door assembly in the door box device according to the above embodiment of the present application, in which the door assembly is in the hovering state;

[0028] Figure 9 A state diagram showing the door assembly in the door box device according to the above embodiment of the present application, in which the door assembly is in the closed state.

[0029] Main element symbol explanation: 1, door box equipment; 10, box frame; 20, door body assembly; 21, door main body; 211, door opening position; 212, hovering position; 213, door closing position; 22, straight line driving mechanism; 221, driving motor; 222, screw rod; 23, counterweight; 231, threaded hole; 232, guide hole; 24, guide column; 25, electronic gyroscope; 30, hinge spring assembly; 31, hinge assembly; 311, hinge base; 312, hinge support; 313, rotating shaft; 32, pull rope; 33, spring; 34, roller assembly; 341, adjusting roller; 342, fixed roller; 40, door lock assembly.

[0030] The above main element symbol explanation is further explained in detail in combination with the drawings and the specific embodiments of the present application. Specific embodiments

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, 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" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0034] In the utility model, unless otherwise expressly provided and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements or the interaction between two elements, unless otherwise expressly limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0036] In some door box devices, the balance or difference between the torque generated by the hinge tension spring system and the gravity torque of the door body assembly is used to realize the hovering and non-hoovering at a certain angle of the door body assembly. The hinge tension spring system mainly consists of a tension spring, a pull rope and a hinge, the hinge is arranged between the box frame and the door body assembly, so that the door body assembly can pivot relative to the box frame to change the door angle, and the tension spring is connected to the hinge through the pull rope to exert torque on the hinge. With the change of the door angle, the gravity G of the door body assembly does not change, but the gravity force arm Lg will change, so that the gravity torque M1=G*Lg changes with the change of the door angle; at the same time, the tension of the pull rope will change with the change of the door angle, so that the tension F of the tension spring acting on the hinge through the pull rope and the force arm Lf of the pull rope will change, that is, the tension torque M2=F*Lf will also change with the change of the door angle.

[0037] In this way, through the design of the hinge tension spring system parameters, M2≈M1 can be generally realized except for small angles, and the curve of the change of the door angle is as shown in Figure 1A and 1B In the area except for small angles, the existing hinge tension spring system can already achieve M2≈M1, and the small difference value can be compensated by the friction force to realize the torque balance hovering except for small angles; and the torque balance hovering within the small angle can be realized by the action of the door seal and the door lock.

[0038] However, although such a hinge spring system can achieve full-angle hovering of the door body, it cannot achieve automatic opening or closing of the door body. Based on this, the applicant designs a door box device which can achieve automatic opening and closing of the door body at full angle, improving user experience.

[0039] Specifically, referring to the accompanying drawings, Figures 2 to 9 An embodiment of the present application provides a door box device 1 which can include a box frame 10 having an opening, a door body assembly 20 for covering the opening of the box frame 10, and a hinge spring assembly 30 provided between the box frame 10 and the door body assembly 20. It can be understood that the door box device 1 of the present application can be but is not limited to being implemented as a sink-type dishwasher or a refrigerator, etc.; in addition, the door box device 1 of the present application can also but is not limited to including a functional body capable of achieving functions such as dishwashing or refrigeration, etc., which will not be described here in detail by the present application.

[0040] More specifically, as Figures 3 to 6 shown, the door body assembly 20 can include a door body 21, a linear drive mechanism 22 mounted to the door body 21, and a counterweight 23 slidably provided to the door body 21 and drivingly connected with the linear drive mechanism 22. As Figure 2 shown, the hinge spring assembly 30 includes a hinge assembly 31 rotatably mounting the door body assembly 20 to the box frame 10, a pull rope 32 connected with the door body assembly 20, and a spring 33 connected to the pull rope 32 and connected with the box frame 10, for exerting a pulling moment on the door body assembly 20 opposite to the direction of the gravitational moment of the door body assembly 20.

[0041] In this way, as Figures 7 to 9 shown, when the counterweight 23 slides relative to the door body 21 under the drive of the linear drive mechanism 22, the center of gravity of the door body assembly 20 is adjusted so that the gravitational moment M1 of the door body assembly 20 is greater than, equal to, or less than the pulling moment M2 exerted by the hinge spring assembly 30 on the door body assembly 20, thereby achieving automatic opening and closing of the door box device 1.

[0042] Notably, as Figure 7 shown, when the gravitational moment M1 is greater than the pulling moment M2, the door body assembly 20 makes an opening motion; as Figure 8 shown, when the gravitational moment M1 is equal to the pulling moment M2, the door body assembly 20 is in a hovering state; as Figure 9As shown, when the gravitational torque M1 is less than the pulling torque M2, the door assembly 20 performs a closing motion. Since the gravitational torque M1 mentioned in this application is equal to the product of the weight G of the door assembly 20 and the gravitational lever arm L1, i.e., M1 = G * L1; and the pulling torque M2 mentioned in the application is equal to the product of the pulling force F applied to the door assembly 20 by the pull rope 32 and the pulling lever arm L2; therefore, when the counterweight 23 slides relative to the door body 21 under the drive of the linear drive mechanism 22, although the weight G of the door assembly 20 does not change, the gravitational lever arm L1 of the door assembly 20 will change, causing the gravitational torque M1 of the door assembly 20 to change for automatic opening and closing of the door at all angles. That is, the door box device 1 of this application achieves automatic opening and closing of the door at all angles by changing the position of the door's center of gravity.

[0043] For example, such as Figure 2 As shown, the hinge assembly 31 includes a hinge base 311 fixedly connected to the box frame 10, a hinge bracket 312 fixedly connected to the door assembly 20, and a pivot 313 rotatably connecting the hinge bracket 312 to the hinge base 311; the two ends of the pull rope 32 are respectively limited and connected to the hinge bracket 312 and the spring 33. It is understood that the limiting connection mentioned in this application may include, but is not limited to, fixed connection, sleeve connection, and hook connection, which will not be elaborated further in this application. Furthermore, the gravity arm L1 mentioned in this application refers to the horizontal distance between the center of the pivot 313 and the center of gravity of the door assembly 20; the pulling arm L2 mentioned in this application refers to the vertical distance between the center of the pivot 313 and a section of the pull rope 32 adjacent to the hinge bracket 312.

[0044] Optionally, such as Figures 3 to 6 As shown, the door body 21 has an open position 211, a hovering position 212, and a closed position 213 arranged sequentially along the sliding direction of the counterweight 23. The distance between the open position 211 and the pivot 313 is greater than the distance between the hovering position 212 and the pivot 313, and the distance between the closed position 213 and the pivot 313 is less than the distance between the hovering position 212 and the pivot 313. Thus, when the counterweight 23 slides sequentially to the open position 211, the hovering position 212, and the closed position 213 under the drive of the linear drive mechanism 22, the counterweight 23 gradually approaches the pivot 313, causing the distance between the center of gravity of the door assembly 20 and the center of the pivot 313 to gradually decrease. This means the gravitational lever arm of the door assembly 20 also gradually decreases, causing the gravitational torque of the door assembly 20 to gradually decrease from a state greater than the tensile torque to a state less than the tensile torque.

[0045] Optionally, such as Figure 5 and Figure 8As shown, when the counterweight 23 is driven by the linear driving mechanism 22 to slide to the hovering position 212, the gravity moment of the door body assembly 20 and the pulling moment of the hinge spring assembly 30 applied to the door body assembly 20 are in moment balance, so that the door body assembly 20 can be in a hovering state; as shown in Figure 3 、 Figure 6 、 Figure 7 and Figure 9 As shown, when the counterweight 23 is driven by the linear driving mechanism 22 to slide from the hovering position 212 to the door opening position 211 or the door closing position 213, the gravity moment of the door body assembly 20 correspondingly increases or decreases to be greater or smaller than the pulling moment applied to the door body assembly 20, thereby breaking the moment balance state, so that the door body assembly 20 is in a door opening state or a door closing state. It can be understood that the moment balance mentioned in the present application refers to that the gravity moment of the door body assembly 20 is substantially equal to the pulling moment of the hinge spring assembly 30 applied to the door body assembly 20, so that the door body assembly 20 hovers at a certain door opening angle under the action of friction.

[0046] Optionally, as shown in Figures 7 to 9 The counterweight 23 slides along the radial direction of the rotating shaft 313, so that the gravity arm of the door body assembly 20 changes more when the counterweight 23 slides the same distance, thereby quickly adjusting the size of the gravity moment, facilitating quick switching of the state of the door box device 1, and improving response timeliness.

[0047] According to the above-mentioned embodiments of the present application, as shown in Figure 3 and Figure 4 The linear driving mechanism 22 can include a driving motor 221 and a screw rod 222 connected with the driving motor 221; the counterweight 23 has a threaded hole 231 matched with the screw rod 222, so as to be threadedly connected with the screw rod 222. In this way, when the driving motor 221 drives the screw rod 222 to rotate, the threaded matching between the counterweight 23 and the screw rod 222 converts the rotary motion into linear motion, so that the counterweight 23 moves linearly along the screw rod 222, thereby adjusting the gravity center position of the door body assembly 20. It can be understood that the driving motor 221 mentioned in the present application can be but not limited to a reduction motor, i.e. an electric motor configured with a reduction gear, for driving the screw rod 222 to rotate.

[0048] Optionally, as shown in Figure 3 and Figure 4As shown, the door body assembly 20 further comprises a guide post 24 fixed to the door body 21 and arranged in parallel with the screw rod 222; the counterweight 23 further has a guide hole 232 matched with the guide post 24, so as to be slidably sleeved on the guide post 24, so as to avoid the direct contact between the counterweight 23 and the door body 21 while ensuring that the counterweight 23 does not rotate with the screw rod 222 for linear motion, thereby facilitating the reduction of frictional resistance.

[0049] Optionally, as shown, the door body assembly 20 further comprises an electronic gyroscope 25 fixed to the counterweight 23, for detecting the inclination angle of the door body assembly 20, so as to calculate the position required for the counterweight 23 to slide, for automatic door opening and closing control. It can be understood that the electronic gyroscope 25 can also be installed on the door body 21, and can also detect the inclination angle of the door body assembly 20, which will not be described herein. Figures 3 to 6

[0050] It is worth noting that the door body assembly 20 of the present application is internally provided with a power board or control board (not shown in the figure) communicably connected with the electronic gyroscope 25 and the drive motor 221. In this way, when there is an instruction to open or close the door, the drive motor 221 works to drive the screw rod 222 to rotate to push the counterweight 23 to move up and down; at the same time, the electronic gyroscope 25 in the counterweight 23 feeds back the inclination angle of the current door body to the power board or control board, which calculates and determines the opening or closing position of the counterweight 23 to achieve the required opening or closing action. When there is no instruction to open or close the door, the electronic gyroscope 25 feeds back the current inclination angle to the power board or control board, which calculates and determines the hovering position of the counterweight 23 to achieve hovering.

[0051] According to the above embodiment of the present application, the spring 33 can be but is not limited to a tension spring, the two ends of which are respectively limitedly connected to the cabinet frame 10 and the pull rope 32. In this way, the pull rope 32 exerts a pulling moment on the door body assembly 20 under the pulling force of the tension spring. It can be understood that in other examples of the present application, the spring 33 can also be implemented as a compression spring, as long as it can provide elastic force to achieve moment balance, which will not be described herein.

[0052] It is worth noting that during the opening and closing of the door, the hinge bracket 312 will rotate with the door body assembly 20 around the rotating shaft 313, so that the pull rope 32 will change with the opening and closing of the door, causing the spring 33 to easily swing greatly with the opening and closing of the door, and a large enough installation space needs to be reserved. In order to solve this problem, as shown, Figures 2 to 9 ​As shown, the hinge spring assembly 30 of this application may further include a roller assembly 34, which is installed on the housing frame 10 and arranged between the spring 33 and the hinge bracket 312. The pull rope 32 passes around the roller assembly 34 to change the direction of the pull rope, so that the direction of the tension applied by the pull rope 32 to the spring 33 is always consistent with the axial direction of the spring 33, preventing the spring 33 from tilting.

[0053] Optionally, such as Figures 7 to 9 As shown, the roller assembly 34 may include an adjusting roller 341 arranged along the axis adjacent to the spring 33 and a fixed roller 342 arranged along the hinge bracket 312. The pull rope 32 extends from the spring 33, passing successively over the adjusting roller 341 and the fixed roller 342 to the hinge bracket 312. In this way, the pull rope 32 first passes over the adjusting roller 341 arranged along the axis adjacent to the spring 33 and then turns, and then passes over the fixed roller 342 arranged along the hinge bracket 312 to connect to the hinge bracket 312. This not only ensures that the spring 33 is only subjected to a force in the same direction as the axis of the spring 33, preventing the spring 33 from tilting, but also increases the tension arm of the pull rope 32, which helps to reduce the elastic force requirement of the spring 33.

[0054] According to the above embodiments of this application, as Figure 2 As shown, the door assembly 20 may further include a door lock assembly 40 disposed between the door assembly 20 and the housing frame 10. 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 20 to the housing frame 10. 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 221 of the linear drive mechanism 22 in the door assembly 20 is triggered to drive the screw 222 to rotate forward, so that the counterweight 23 moves upward (towards the direction away from the rotating shaft 313) to increase the gravitational torque of the door assembly 20, disrupt the torque balance, and thus realize automatic door opening.

[0055] Similarly, when the door needs to be closed, the closing signal will trigger the drive motor 221 to drive the screw 222 to reverse, causing the counterweight 23 to move downward (towards the direction close to the rotating shaft 313) to reduce the gravitational torque of the door assembly 20, disrupt the torque balance, and thus achieve automatic closing.

[0056] It is worth noting that although the opening and closing speed of the door assembly 20 needs to be controlled to ensure safety during the opening and closing process (i.e., opening or closing the door), the door assembly 20 of this application only needs to control the up and down position of the counterweight 23 to control the opening and closing speed. For example, during the opening process of the door assembly 20: Figure 3and Figure 7 As shown, if the counterweight 23 slides upward to a farther opening position under the drive of the linear drive mechanism 22, the gravitational torque of the door assembly 20 increases significantly, resulting in a faster opening speed of the door assembly 20; Figures 6 to 9 As shown, if the counterweight 23 slides upward to a closer opening position under the drive of the linear drive mechanism 22, the gravitational torque of the door assembly 20 increases less, thus slowing down the opening speed of the door assembly 20. Similarly, during the closing process, the door assembly 20 of this application only needs to control the closing position of the counterweight 23 as it slides downward to control the closing speed of the door assembly 20.

[0057] According to the above embodiments of this application, the number of hinge spring assemblies 30 in each door box device 1 can be one or two, both of which can automatically open or close a single door assembly 20. For example, in one example of this application, two hinge spring assemblies 30 can be located on the left and right sides of the box frame 10 respectively, to cooperate in achieving automatic door opening and closing; or, in another example of this application, a single hinge spring assembly 30 can also be arranged on the left or right side of the box frame 10, still achieving automatic door opening and closing, which will not be elaborated further in this application.

[0058] 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.

[0059] 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. A door box apparatus, characterized by, The application relates to a door body assembly of a refrigerator. The door body assembly comprises a door body, a linear driving mechanism installed on the door body, and a counterweight slidably arranged on the door body and connected with the linear driving mechanism. The hinged spring assembly comprises a hinge assembly for rotatably connecting the door body assembly with the cabinet frame, a pull rope connected with the door body assembly, and a spring connected with the cabinet frame and the pull rope, for applying a pulling moment to the door body assembly in a direction opposite to the gravity moment of the door body assembly. When the counterweight slides relative to the door body under the driving of the linear driving mechanism, the gravity center of the door body assembly is adjusted so that the gravity moment of the door body assembly is greater than, equal to or smaller than the pulling moment applied by the hinged spring assembly. The hinge assembly comprises a hinge base fixedly connected with the cabinet frame, a hinge support fixedly connected with the door body, and a rotating shaft rotatably connecting the hinge support with the hinge base; and the two ends of the pull rope are respectively connected with the hinge support and the spring.

2. The door box apparatus according to claim 1, characterized by The door body has an opening position, a hovering position and a closing position arranged in sequence along the sliding direction of the counterweight; the distance between the opening position and the rotating shaft is greater than the distance between the hovering position and the rotating shaft, and the distance between the closing position and the rotating shaft is smaller than the distance between the hovering position and the rotating shaft.

3. The door box apparatus of claim 2, wherein, When the counterweight slides to the hovering position under the driving of the linear driving mechanism, the gravity moment of the door body assembly and the pulling moment applied by the hinged spring assembly are in moment balance; when the counterweight slides from the hovering position to the opening position or the closing position under the driving of the linear driving mechanism, the gravity moment of the door body assembly correspondingly increases or decreases to break the moment balance.

4. The door box apparatus of claim 3, wherein, The counterweight slides along the radial direction of the rotating shaft.

5. The door box apparatus of claim 3, wherein, The hinged spring assembly further comprises a roller assembly installed on the cabinet frame, which is arranged between the spring and the hinge support, and the pull rope passes through the roller assembly, so that the pulling direction of the pull rope to the spring is always consistent with the axial direction of the spring.

6. The door box apparatus of claim 2, wherein, The roller assembly comprises an adjusting roller arranged adjacent to the axial line of the spring and a fixed roller arranged adjacent to the hinge support; and the pull rope passes through the adjusting roller and the fixed roller in sequence from the spring to the hinge support.

7. The door box apparatus of claim 6, wherein, The linear driving mechanism comprises a driving motor and a screw rod connected with the driving motor; and the counterweight has a threaded hole matched with the screw rod, for threadedly connecting with the screw rod.

8. The door box apparatus according to any one of claims 1 to 7, characterized by The door body assembly further comprises a guide column fixedly arranged on the door body and parallel to the screw rod; and the counterweight further has a guide hole matched with the guide column, for slidably sleeving on the guide column.

9. The door box apparatus of claim 8, wherein, The door body assembly further comprises an electronic gyroscope fixedly arranged on the counterweight.

10. The door box apparatus of claim 8, wherein, ​

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