CN115962604A - Refrigerator - Google Patents

Abstract

The invention provides a refrigerator, which comprises a refrigerator body, a first rack, a second rack, an obstacle measuring device and a main control board, wherein the refrigerator body is provided with a storage compartment, the first rack and the second rack are arranged in the storage compartment side by side, the first rack and the second rack are configured to be capable of lifting in the vertical direction respectively, the obstacle measuring device is arranged on the upper surface of the first rack and is positioned at the edge of the first rack close to the second rack, the obstacle measuring device is configured to detect whether an obstacle exists at the edge of the first rack when the height difference of the first rack and the second rack is smaller than a preset distance threshold value, and the main control board is electrically connected with the obstacle measuring device and is configured to prohibit the first rack and the second rack from lifting under the condition that the obstacle measuring device detects that the obstacle exists. For the two lifting racks, the refrigerator can reduce the risk of dumping articles, improves the lifting safety of the two racks, and has strong practicability and easy popularization.

Description

Refrigerator

Technical Field

The invention relates to the field of refrigeration and freezing, in particular to a refrigerator.

Background

Generally, a temperature field of a storage compartment of a refrigerator often has a certain temperature difference, and in order to accurately control the temperature of food, a rack capable of being lifted is provided in the prior art, and the height of the rack can be automatically or manually adjusted. However, the rack in the prior art is single, so that the space of the storage chamber cannot be fully utilized, and the user experience is not good.

Disclosure of Invention

An object of the present invention is to overcome at least one of the drawbacks of the prior art and to provide a refrigerator having two liftable racks.

It is a further object of the present invention to reduce the risk of tipping of articles across the two racks and at the edge of the first rack, improving the safety of the lifting of the first and second racks. .

It is another further object of the present invention that the adjustment of the first rack and the second rack is more reliable.

It is still another object of the present invention that the first and second racks not only ascend and descend smoothly but also hover stably so as to carry articles at different heights.

In particular, the present invention provides a refrigerator comprising: a box body provided with a storage chamber;

the first rack and the second rack are arranged in the storage room side by side and are configured to be lifted and lowered along the vertical direction respectively; the obstacle detection device is arranged on the upper surface of the first rack, is positioned at the edge of the first rack close to the second rack, and is configured to detect whether an obstacle exists at the edge of the first rack when the height difference between the first rack and the second rack is smaller than a preset distance threshold;

and the main control panel is electrically connected with the obstacle measuring device and is configured to prohibit the first rack and the second rack from lifting under the condition that the obstacle measuring device detects that the obstacle exists.

Optionally, the refrigerator further comprises: the two sets of driving mechanisms are used for respectively driving the first rack and the second rack to lift, and each set of driving mechanism also comprises a lifting motor; and the main control board is electrically connected with the two lifting motors respectively, and the main control board is configured to forbid the two lifting motors from starting under the condition that the obstacle detecting device detects that the obstacle exists.

Optionally, each set of drive mechanisms further comprises: the screw rod is arranged along the vertical direction and is connected with the lifting motor; a guide bar arranged in a vertical direction; the lifting frame comprises a connecting piece and a supporting piece for supporting the first rack or the second rack, the connecting piece is connected with the guide rod in a sliding mode and is in threaded connection with the screw rod of the screw rod, the supporting piece is fixed on the connecting piece, and the lifting frame is configured to enable the connecting piece to lift along the guide rod under the driving of the screw rod, so that the supporting piece drives the first rack or the second rack to lift.

Optionally, the obstacle measuring device is an infrared sensor; and the barrier detection device is configured to emit infrared light from back to front so as to detect the barrier at the edge of the first rack by using the infrared light.

Alternatively, the height between the light emitting part of the barrier measuring device and the upper surface of the first rack is at an arbitrary value in the range of 0 to 3 cm.

Alternatively, the preset distance threshold is configured to be any value in the range of 0 to 3 cm.

Optionally, the lift motor is a stepper motor.

Optionally, the refrigerator further comprises: and the distance measuring device is electrically connected with the main control board and is configured to detect the height difference of the first rack and the second rack and send the height difference to the main control board.

Optionally, the distance measuring device is a hall sensor.

Optionally, the refrigerator further comprises: and the voice prompt device is electrically connected with the main control board and is configured to carry out voice prompt when the first rack and the second rack are forbidden to lift.

In the refrigerator, the first rack and the second rack are arranged in the storage room side by side and can be lifted up and down, the obstacle detection device is arranged on the first rack and is positioned close to the edge of the second rack so as to detect whether an obstacle exists at the edge of the first rack, when the obstacle detection device detects that the obstacle exists, the first rack and the second rack are prohibited to be lifted up and down, and when the obstacle detection device detects that the obstacle does not exist, the first rack and the second rack can be lifted up and down freely and are not restrained, so that the risk of toppling over of articles on the two racks and at the edge of the first rack is reduced, and the safety of the first rack and the second rack during lifting is improved.

Furthermore, the precondition of the operation of the fault detection device of the refrigerator of the present invention is that the first rack and the second rack are smaller than the preset distance threshold, and the preset distance threshold can be set to any value within the range of 0 to 3cm, that is, the fault detection device operates on the premise that the first rack and the second rack are not completely in a flush state but have a certain height difference, so that the condition range of the fault detection device can be expanded, the adjustment of the first rack and the second rack is more reliable, and the safety is higher.

Furthermore, the fixed end of the lifting motor can be fixed on the box body, the output shaft of the lifting motor can be connected with one end of the screw rod through a coupler and the like, the guide rod can be vertically fixed on the box body and is positioned on one side of the screw rod, one part of the connecting piece of the lifting frame is in sliding connection with the guide rod, the other part of the connecting piece of the lifting frame is in threaded connection with the screw rod of the screw rod, and the supporting piece of the lifting frame is simultaneously fixed with the bottom surface of the first rack and the connecting piece of the lifting frame. In the lifting process, the lifting motor is started to drive the screw rod to rotate, the screw rod drives the connecting piece of the lifting frame to lift, the guide rod can play a role in guiding and limiting the axial degree of freedom of the connecting piece, the connecting piece drives the supporting piece to lift, the supporting piece can drive the first rack (or the second rack) to lift, and a driving mechanism consisting of the lifting motor, the screw rod, the guide rod and the lifting frame can enable the first rack (or the second rack) to lift smoothly and hover stably so as to bear articles at different heights.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily to scale. In the drawings:

fig. 1 is a schematic structural view of a first rack, a second rack and a driving mechanism thereof in a refrigerator according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a positional relationship of a first rack, a second rack and a barrier measuring device in a refrigerator according to an embodiment of the present invention;

fig. 3 is an operational principle block diagram of a refrigerator according to one embodiment of the present invention.

Detailed Description

In the description of the present embodiment, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "depth", and the like indicate orientations or positional relationships that are based on the orientation in the normal use state of the refrigerator as a reference, and can be determined with reference to the orientations or positional relationships shown in the drawings, for example, "front" indicating the orientation means the side toward the user. This is merely to facilitate description of the invention and to simplify the description, and is not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed and operated in a particular orientation, and thus should not be taken to be limiting of the invention.

The invention provides a refrigerator which can comprise a refrigerator body and a door body, wherein the refrigerator body can comprise an outer shell and one or more inner containers, and the outer shell is positioned at the outermost side of the whole refrigerator so as to protect the whole refrigerator. The space between the inner container and the outer shell is filled with heat insulating materials (forming a foaming layer) to reduce the outward heat dissipation of the inner container. Each inner container can define a storage compartment which is opened forwards, and the storage compartments can be configured into a refrigerating compartment, a freezing compartment, a temperature changing compartment and the like, and the number and the functions of the specific storage compartments can be configured according to the preset requirements.

The door body can be arranged on the front side of the box body and used for opening and closing the storage chamber, the door body can be arranged on one side of the front portion of the box body in a hinged mode, the storage chamber can be opened and closed in a pivoting mode, the number of the door body can be matched with the number of the storage chamber, and therefore the storage chamber can be opened one by one.

The refrigerator can also be provided with cold energy by a circulating refrigeration system, and the refrigeration system can be a refrigeration circulating system composed of a compressor, a condenser, a throttling device, an evaporator and the like.

Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a first rack 100, a second rack 200 and a driving mechanism thereof in a refrigerator according to an embodiment of the present invention, fig. 2 is a schematic positional relationship diagram of the first rack 100, the second rack 200 and a barrier measuring device 300 in the refrigerator according to an embodiment of the present invention, and fig. 3 is a functional block diagram of the refrigerator according to an embodiment of the present invention. In some embodiments, the refrigerator may include a first rack 100, a second rack 200, a barrier measuring device 300, and a main control panel 400, the first rack 100 and the second rack 200 are arranged side by side in one storage compartment, and the first rack 100 and the second rack 200 may be respectively controlled to be lifted and lowered in a vertical direction. The obstacle detection device 300 is disposed on an upper surface of the first rack 100 and located at an edge of the first rack 100 close to the second rack 200, and detects whether an obstacle exists at the edge of the first rack 100 when a height difference between the first rack 100 and the second rack 200 is smaller than a preset distance threshold. The main control board 400 is electrically connected to the obstacle measuring device 300 and configured to prohibit the first rack 100 and the second rack 200 from being lifted or lowered if the obstacle measuring device 300 detects that an obstacle exists.

That is, the refrigerator of the present embodiment has two liftable racks, i.e., the first rack 100 and the second rack 200, so that the space of the storage compartment is fully utilized and the temperature can be precisely controlled.

The first rack 100 and the second rack 200 may be arbitrarily disposed at the left or right side of the storage compartment, and fig. 1 shows the case where the first rack 100 is at the right side and the second rack 200 is at the left side, but it is understood that the positions of the first rack 100 and the second rack 200 may be interchanged, and the following description will be made by taking the arrangement form shown in fig. 1 as an example.

In the present embodiment, the first and second racks 100 and 200 are operatively or automatically lifted and lowered in the vertical direction. For example, the user may operate the first and second racks 100 and 200 to be raised and lowered by a remote controller, an adjustment button, or the like according to the size of the items to be stored; for another example, the first rack 100 and the second rack 200 may be lifted and lowered by voice control, automatic control, etc. to precisely control the temperature of the articles.

The obstacle detection device 300 is located at an edge of the first rack 100 close to the second rack 200, and detects whether an obstacle exists at the edge of the first rack 100 when a height difference between the first rack 100 and the second rack 200 is smaller than a preset distance threshold. The fault detection device 300 may transmit the detection result to the main control board 400, and the main control board 400 may prohibit or allow the first rack 100 and the second rack 200 to be lifted or lowered according to the detection result.

Specifically, when the height difference between the first rack 100 and the second rack 200 is greater than the preset distance threshold, the first rack 100 and the second rack 200 can be lifted freely, and since a large height difference exists between the first rack 100 and the second rack 200 at this time, it can be determined that no obstacle exists between the first rack 100 and the second rack 200, and the free lifting of the two racks can be allowed.

When the height difference between the first rack 100 and the second rack 200 is smaller than the predetermined distance threshold, since the height difference between the first rack 100 and the second rack 200 is smaller, a user may place some articles with larger sizes between the first rack 100 and the second rack 200, and once any rack is controlled to operate, there is a risk that the articles may be toppled over, especially for a long and tall container or an open container, liquid may easily flow out, and the environment of the storage compartment may be polluted.

At this time, the obstacle detecting device 300 starts to detect whether an obstacle exists at the edge of the first rack 100, if an obstacle exists at the edge of the first rack 100, it can be determined that an object crosses between the first rack 100 and the second rack 200 or is located at the edge of the first rack 100, the obstacle detecting device 300 can send the detection result to the main control board 400, and the main control board 400 can prohibit any one of the first rack 100 and the second rack 200 from ascending and descending, so as to avoid the object from falling. If the obstacle detecting device 300 does not detect an obstacle, the first rack 100 and the second rack 200 can be lifted freely without restriction.

In the present embodiment, since the obstacle detecting device 300 is disposed on the first rack 100 and detects whether an obstacle exists at the edge of the first rack 100 close to the second rack 200, the obstacle detecting device 300 may detect the existence of the obstacle in two situations: first, an obstacle straddles the first rack 100 and the second rack 200; second, an obstacle is located at an edge of the first rack 100, but is not mounted on the second rack 200. The inventor has realized that for the second case, although the detected "obstacle" is not across the first rack 100 and the second rack 200, the articles may easily fall under the actions of inertia and shaking caused by lifting once the first rack 100 and the second rack 200 are allowed to be lifted, so in the present embodiment, for the second case, the main control board 400 still prohibits the first rack 100 and the second rack 200 from being lifted, further reducing the risk of article falling, and improving the safety when the first rack 100 and the second rack 200 are lifted.

Referring to fig. 1 and 3, further, the refrigerator may further include two sets of driving mechanisms, each set of driving mechanisms may further include a lifting motor 510, the main control board 400 is electrically connected to the two lifting motors 510, and the main control board 400 is configured to prohibit the two lifting motors 510 from being activated when the obstacle detection device 300 detects that an obstacle exists.

Specifically, the lifting motors 510 may further be provided with a protection circuit, the obstacle detection device 300 sends a detection result thereof to the main control board 400, and the main control board 400 sends an instruction to the protection circuit according to the detection result, so that the protection circuit is used to prohibit the two lifting motors 510 from being started when the existence of an obstacle is detected, and the two lifting motors 510 are allowed to be started when the existence of an obstacle is not detected.

Further, the refrigerator may further be provided with an indicator light so as to show a user whether the starting condition of the lifting motor 510 is satisfied or not in real time, for example, when the indicator light is green, the starting condition is satisfied, and when the indicator light is red, the starting condition is not satisfied, so that the user needs to adjust the position of the article.

Referring to fig. 1, further, each set of driving mechanism may further include a lead screw 520, a guide rod 530, and a lifting frame 540, the lead screw 520 is disposed in a vertical direction and connected to the lifting motor 510, the guide rod 530 is disposed in the vertical direction, the lifting frame 540 includes a connector 542 and a support 544 for supporting the first rack 100 or the second rack 200, the connector 542 is slidably connected to the guide rod 530 and is threadedly connected to the screw 522 of the lead screw 520, the support 544 is fixed to the connector 542, and the lead screw 520 may drive the lower connector 542 to be lifted along the guide rod 530, such that the support 544 drives the first rack 100 or the second rack 200 to be lifted.

The fixed end of the lifting motor 510 can be fixed on the box body, the output shaft of the lifting motor 510 can be connected with one end of the lead screw 520 through a shaft coupling, etc., the guide bar 530 can be fixed on the box body vertically and is positioned at one side of the lead screw 520, one part of the connector 542 of the lifting frame 540 is connected with the guide bar 530 in a sliding way, the other part is connected with the screw 522 of the lead screw in a threaded way, the support member 544 of the lifting frame 540 is approximately triangular, one side of the support member 544 is fixed with the bottom surface of the first rack 100 (or the second rack 200), and the other side is fixed with the connector 542 of the lifting frame 540.

When the lifting motor 510 is turned on and drives the screw 520 to rotate, the screw 520 drives the connecting member 542 of the lifting frame 540 to lift, the guiding rod 530 can guide and limit the axial degree of freedom of the connecting member 542, the connecting member 542 drives the supporting member 544 to lift, and the supporting member 544 can drive the first rack 100 (or the second rack 200) to lift.

Further, the barrier detection device 300 is an infrared sensor, and the barrier detection device 300 may emit infrared light from back to front to detect whether an obstacle exists at an edge of the first rack 100 by using the infrared light.

That is, the infrared sensor may be disposed at the rear side of the first rack 100, so that the space in front of the first rack 100 is not occupied, and the probability of the user mistakenly touching the obstacle detection device 300 is reduced, so that the detection angle of the infrared sensor does not deviate from the set angle.

Further, the height between the light emitting portion of the barrier measuring device 300 and the upper surface of the first rack 100 is at any value in the range of 0 to 3cm, for example, 0, 1cm, or 3 cm. The light emitting part of the barrier measuring device 300 is slightly higher than the upper surface of the first rack 100 by the above limitation, so that the light emitted by the light emitting part of the barrier measuring device 300 avoids interfering with the upper surface of the first rack 100, and the probability of error detection is reduced.

In some embodiments, the preset distance threshold may be set to any value in the range of 0 to 3cm, such as 0, 1cm, or 3cm, etc.

That is, in the present embodiment, the precondition for detecting whether the first rack 100 has an obstacle is not that the first rack 100 and the second rack 200 are completely in the flush state. The present invention recognizes that it is actually a special state that the first rack 100 and the second rack 200 are level, and the user may cross the article to be prevented between the first rack 100 and the second rack 200 (at which the article may be in equilibrium) even in the case that the difference in height between the two is not great, and thus the reliability of detecting the obstacle is not high only when the two are level, and thus, the range of the condition of detection can be extended by the above definition, so that the adjustment reliability of the first rack 100 and the second rack 200 is better, and the safety is higher.

In some embodiments, the lifting motor 510 is a stepping motor, the stepping motor is a motor that converts an electric pulse signal into a corresponding angular displacement or linear displacement, the main control board 400 of the refrigerator may further pre-store a preset angular displacement before the refrigerator leaves the factory, and the lifting motor 510 rotates in a unit of the preset angular displacement after receiving an action command of the main control board 400.

Referring to fig. 3, in some embodiments, the refrigerator may further include a distance measuring device 600, the distance measuring device 600 being electrically connected to the main control board 400, the distance measuring device 600 being capable of detecting a height difference of the first rack 100 and the second rack 200 and transmitting the height difference to the main control board 400.

In this embodiment, the distance measuring device 600 may be two hall sensors, the two hall sensors are respectively electrically connected to the two lifting motors 510 and are used for detecting the number of steps of the two lifting motors 510, and since the driving motor drives the lead screw 520 and the lead screw 520 drives the lifting frame 540 to lift, it can be regarded as a linear relationship, therefore, the relationship between the number of steps of the stepping motor and the lifting distance can be stored in advance before the refrigerator leaves the factory, and then the height of each rack is determined, so as to determine the height difference between the first rack 100 and the second rack 200.

Of course, those skilled in the art may make corresponding modifications after knowing the solution of the present embodiment, and still achieve the purpose of detecting the height difference between the first rack 100 and the second rack 200, for example, by using an infrared distance meter or the like, which is not illustrated herein.

Referring to fig. 3, in some embodiments, the refrigerator may further include a voice prompt device 700, the voice prompt device 700 may be a speaker, and the voice prompt device 700 may be electrically connected to the main control board 400, and when the main control board 400 prohibits the two lifting motors 510 from being activated, a prompt tone or a pre-stored prompt voice is emitted to the user, so that the user may adjust the position of the article in time.

In the refrigerator of the present invention, the first rack 100 and the second rack 200 are arranged side by side in the storage compartment and can be lifted up and down, the obstacle detection device 300 is arranged on the first rack 100 and is located near the edge of the second rack 200 to detect whether an obstacle exists at the edge of the first rack 100, when the obstacle detection device 300 detects that an obstacle exists, the first rack 100 and the second rack 200 are prohibited from lifting, and when the obstacle detection device 300 detects that no obstacle exists, the first rack 100 and the second rack 200 can be lifted up and down freely and are not restricted, so that the risk of articles crossing over the two racks and located at the edge of the first rack 100 toppling over is reduced, and the safety of the first rack 100 and the second rack 200 during lifting is improved.

Further, in the refrigerator of the present invention, the obstacle detection device 300 operates on the premise that the first rack 100 and the second rack 200 are smaller than the preset distance threshold, and the preset distance threshold may be set to any value within a range of 0 to 3cm, that is, the obstacle detection device 300 operates on the premise that the first rack 100 and the second rack 200 are not completely flush but have a certain height difference, which can extend the range of the conditions detected by the obstacle detection device 300, so that the adjustment of the first rack 100 and the second rack 200 is more reliable and safer.

Further, in the refrigerator of the present invention, the fixed end of the lifting motor 510 may be fixed on the refrigerator body, the output shaft of the lifting motor 510 may be connected with one end of the lead screw 520 through a shaft coupling, etc., the guide rod 530 may be fixed on the refrigerator body in a vertical direction and located at one side of the lead screw 520, one part of the connector 542 of the lifting frame 540 is slidably connected with the guide rod 530, the other part is threadedly connected with the screw 522 of the lead screw, and the support 544 of the lifting frame 540 is simultaneously fixed with the bottom surface of the first rack 100 and the connector 542 of the lifting frame 540. In the lifting process, the lifting motor 510 is started to drive the screw 520 to rotate, the screw 520 drives the connecting member 542 of the lifting frame 540 to lift, the guide rod 530 can play a role in guiding and limiting the axial degree of freedom of the connecting member 542, the connecting member 542 drives the supporting member 544 to lift, the supporting member 544 can drive the first rack 100 (or the second rack 200) to lift, and the driving mechanism formed by the lifting motor 510, the screw 520, the guide rod 530 and the lifting frame 540 can enable the first rack 100 (or the second rack 200) to lift smoothly and suspend stably so as to bear articles at different heights.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A refrigerator characterized by comprising:

a box body provided with a storage chamber;

a first rack and a second rack which are arranged in parallel in the storage compartment, and the first rack and the second rack are configured to be lifted and lowered in a vertical direction respectively;

the obstacle detection device is arranged on the upper surface of the first rack, is positioned at the edge of the first rack close to the second rack, and is configured to detect whether an obstacle exists at the edge of the first rack when the height difference between the first rack and the second rack is smaller than a preset distance threshold;

the main control panel is electrically connected with the obstacle measuring device and is configured to prohibit the first rack and the second rack from lifting under the condition that the obstacle measuring device detects that an obstacle exists.

2. The refrigerator according to claim 1, characterized by further comprising:

the two sets of driving mechanisms are used for respectively driving the first rack and the second rack to lift, and each set of driving mechanism further comprises a lifting motor; and is provided with

The main control board is electrically connected with the two lifting motors respectively, and the main control board is configured to forbid the two lifting motors from starting under the condition that the obstacle detecting device detects that an obstacle exists.

3. The refrigerator as claimed in claim 2, wherein each set of the driving mechanism further comprises:

the screw rod is arranged along the vertical direction and is connected with the lifting motor;

a guide bar arranged in a vertical direction;

the lifting frame comprises a connecting piece and a supporting piece used for supporting the first rack or the second rack, the connecting piece is connected with the guide rod in a sliding mode and is in threaded connection with the screw rod of the screw rod, the supporting piece is fixed on the connecting piece, and the lifting frame is configured to be driven by the screw rod to lift along the guide rod through the connecting piece, so that the supporting piece drives the first rack or the second rack to lift.

4. The refrigerator as claimed in claim 1, wherein the refrigerator further comprises a cover for covering the opening of the door

The barrier measuring device is an infrared sensor; and is provided with

The barrier detection device is configured to emit infrared light from back to front so as to detect an obstacle at the edge of the first rack by using the infrared light.

5. The refrigerator as claimed in claim 4, wherein the refrigerator further comprises a cover for covering the opening of the door

The height between the light emitting part of the barrier measuring device and the upper surface of the first rack is any value in the range of 0-3 cm.

6. The refrigerator as claimed in claim 1, wherein the refrigerator further comprises a door for opening the door

The preset distance threshold is configured to be any value in the range of 0 to 3 cm.

7. The refrigerator as claimed in claim 2, wherein the refrigerator further comprises a cover for covering the opening of the door

The lifting motor is a stepping motor.

8. The refrigerator according to claim 1, further comprising:

and the distance measuring device is electrically connected with the main control board and is configured to detect the height difference of the first rack and the second rack and send the height difference to the main control board.

9. The refrigerator as claimed in claim 8, wherein the refrigerator further comprises a cover for covering the opening of the door

The distance measuring device is a Hall sensor.

10. The refrigerator according to claim 1, characterized by further comprising:

and the voice prompt device is electrically connected with the main control board and is configured to perform voice prompt when the first rack and the second rack are prohibited from lifting.

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