Lifting shelf, refrigerator and control method

Abstract

The application discloses a lifting shelf, a refrigerator and a control method, and relates to a lifting shelf which comprises a shelf plate and a support frame supporting the shelf plate, wherein the support frame comprises a lifting device supporting the shelf plate, and the lifting device comprises a lifting rod supporting the shelf plate and a driving mechanism controlling the lifting rod to lift. The application supports the shelf plate of the shelf by a telescopic mechanism, so that the shelf plate can be lifted and adjusted, thereby adapting to the placement of articles of different heights and facilitating the taking and placing of articles by adjusting the height of the shelf plate.

Description

Technical Field

[0001] This invention relates to the field of storage equipment technology, and particularly to lifting shelves, refrigerators, and control methods. Background Technology

[0002] As people's living standards continue to improve, their requirements for refrigerators are also increasing. Currently, the shelves on refrigerators are placed on the ribs of the refrigerator liner and cannot be adjusted in height. This leads to situations where users need to remove the shelves when storing tall items because they cannot adjust the height between the shelves. However, storing the removed shelves is also a problem, and the process of removing them may scratch the refrigerator liner. Although there are some height-adjustable shelf devices, they do not solve the problem of insufficient storage space when the shelves are raised to their highest point. Therefore, a device is needed to solve this problem. Summary of the Invention

[0003] To solve the problem of non-adjustable shelves, this invention proposes a lifting shelf that uses a telescopic mechanism to support the shelf's display board, allowing the display board to be raised and lowered for easy access to items.

[0004] The technical solution adopted in this invention relates to a lifting shelf, including an upper shelf and a support frame supporting the upper shelf. The support frame includes a lifting device supporting the shelf, and the lifting device includes a lifting rod supporting the upper shelf and a drive mechanism for controlling the lifting rod to move up and down.

[0005] In some embodiments, the lifting rod is provided with a rack, the support frame is provided with a turntable, and the surface of the turntable is provided with spiral patterns that cooperate with the rack.

[0006] In some embodiments, the turntable is positioned relative to the support frame via a ratchet mechanism.

[0007] In some embodiments, the ratchet mechanism includes a ratchet located on the turntable and a pawl located on the support frame. The ratchet is located opposite the helix on the other side of the turntable, and the pawl prevents the lifting rod from descending when it engages the ratchet.

[0008] In some embodiments, the support frame is provided with a rotating shaft, the turntable is rotatably mounted on the rotating shaft, the pawl is connected to the rotating shaft and can swing around the rotating shaft, and the rotating shaft is inclined relative to the rack, such that a portion of the helical teeth located on one side of the center of the helical pattern meshes with the rack.

[0009] In some embodiments, the lifting rod supports the upper shelf via a telescopic frame. The telescopic frame includes a crossbar and two parallel screws. Screws are fitted onto the screws. The upper shelf is rotatably connected to the screws. The screws are rotated by a rotating device. A vertical baffle is provided on one end of the upper shelf opposite to the screws. When the screws move toward the vertical baffle, the end of the upper shelf can move up and down along the surface of the vertical baffle.

[0010] In some embodiments, the rotation control device includes two pulleys mounted on the crossbar, each pulley being connected to one of the two screws, the pulleys of the two screws being connected by the same transmission belt, and one of the pulleys being controlled to rotate by a screw motor.

[0011] In some embodiments, the upper shelf is provided with guide wheels on its end side, which are opposite to the vertical baffle.

[0012] In some embodiments, a telescopic rod is connected between the side of the vertical baffle and the upper shelf, and the two ends of the telescopic rod are rotatably connected to the side of the vertical baffle and the upper shelf, respectively.

[0013] In some embodiments, a lower shelf located below the upper shelf and a distance detection sensor for detecting the distance between the upper shelf and the lower shelf are also included, and a pressure sensor is provided on the upper shelf.

[0014] Refrigerator, including the aforementioned lift-up shelves.

[0015] A control method is applied to the aforementioned lifting shelf; the control method includes: acquiring the height information of the item to be placed, determining whether the distance between the upper shelf and the lower shelf is greater than the height of the item to be placed; if so, placing the item to be placed on the lower shelf; if not, determining whether the height of the item to be placed is less than the maximum height that the upper shelf can rise relative to the lower shelf; if so, using a lifting device to raise the upper shelf to a height greater than the required height; if not, determining whether there is an item on the upper shelf; if not, rotating the screw to retract the upper shelf toward the vertical baffle.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention utilizes a telescopic mechanism to support the shelf's display board, allowing the display board to be raised and lowered for placement of items of different heights. Adjusting the height of the display board facilitates easy retrieval and placement.

[0018] 2. This invention utilizes a threaded turntable to drive a rack to achieve lifting and lowering control of the shelf, resulting in a simple, compact structure that is easy to use.

[0019] 3. This invention also utilizes a screw and sleeve telescopic mechanism to retract and extend the storage board, thereby changing the layout of the storage space to accommodate the storage of different items. Attached Figure Description

[0020] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings. To illustrate the details and facilitate understanding of its principles, the drawings are not necessarily to scale, and similar reference numerals may describe similar components in different views. The accompanying drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Wherein:

[0021] Figure 1 This is a diagram showing shelves inside a refrigerator.

[0022] Figure 2 This is a schematic diagram of the shelf.

[0023] Figure 3 This is an exploded view of the shelf.

[0024] Figure 4 This is a cross-sectional view of the shelf.

[0025] Figure 5 This is a diagram of the turntable.

[0026] Figure 6 This is a schematic diagram of the connection between the pawl and the bushing.

[0027] Figure 7 This is a diagram of a pawl.

[0028] Figure 8 This is a schematic diagram of the column.

[0029] Figure 9 This is a schematic diagram of the lifting rod and crossbar.

[0030] Figure 10 This is a schematic diagram of the connecting rod.

[0031] Figure 11 This is a schematic diagram of a pawl locking a ratchet.

[0032] Figure 12 This is a diagram illustrating the pawl releasing the ratchet.

[0033] Figure 13 This is a schematic diagram showing the connection between the upper shelf and the telescopic rod.

[0034] Figure 14 This is a schematic diagram showing the connection between the upper shelf and the screw.

[0035] Figure 15 This is a schematic diagram of the interaction between the pulley and the drive belt.

[0036] Figure 16This is a diagram showing the upper shelf when it is folded up.

[0037] Figure 17 This is a flowchart of the control method. Detailed Implementation

[0038] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following embodiments do not limit the invention covered by the claims. Furthermore, not all combinations of the features described in the embodiments are necessary for the inventive solution.

[0039] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] Refrigerator shelves are components inside a refrigerator, typically movable flat panels or racks, used to store food, beverages, and other items. These shelves help organize the interior of the refrigerator, making it neater and more organized, and allow for the separate storage of different types of food.

[0042] As people's living standards continue to improve, their requirements for refrigerators are also increasing. Currently, the shelves on refrigerators are placed on the ribs of the refrigerator liner and cannot be adjusted in height. This leads to situations where users need to remove the shelves when storing tall items because they cannot adjust the height between the shelves. However, storing the removed shelves is also a problem, and the process of removing them may scratch the refrigerator liner. Although there are some height-adjustable shelf devices, they do not solve the problem of insufficient storage space when the shelves are raised to their highest point. Therefore, a device is needed to solve this problem.

[0043] like Figure 1 As shown, the lifting shelf includes a lower shelf located below the upper shelf 2 and a distance detection sensor for detecting the distance between the upper shelf 2 and the lower shelf, so as to detect the distance between the upper shelf 2 and the lower shelf. A pressure sensor is provided on the upper shelf 2 so as to detect whether there are items placed on the upper shelf 2.

[0044] like Figure 2 , 3 As shown in Figure 4, a support frame for supporting the upper shelf 2 is provided between the upper shelf 2 and the lower shelf. The support frame includes a lifting device for supporting the shelf, and the lifting device includes a lifting rod 8 supporting the upper shelf 2 and a drive mechanism for controlling the lifting rod 8 to move up and down. The shelf is supported by a telescopic mechanism, allowing the shelf to be adjusted in height to accommodate items of different heights. Adjusting the height of the shelf facilitates easy access to items.

[0045] like Figure 5 , 6 As shown in Figure 7, a rack 81 is provided on the lifting rod 8, and a turntable 10 is provided on the support frame. The turntable 10 has a spiral pattern 102 that mates with the rack 81 on its surface. The spiral pattern 102 and the planar Archimedean thread are also provided. When the turntable 10 rotates, different parts of the Archimedean thread mate with the teeth of the rack 81, thereby causing the rack 81 to rise and fall relative to the turntable 10. The rotation of the turntable 10 can be manual or controlled by a motor or other equipment.

[0046] The turntable 10 is positioned relative to the support frame via a ratchet mechanism, so that after the turntable 10 rotates at a certain angle, its position can be fixed under the action of the ratchet mechanism, thereby keeping the position of the shelf fixed.

[0047] like Figure 11 , 12 As shown, the ratchet mechanism includes a ratchet on the turntable 10 and a pawl 11 on the support frame. The ratchet and the spiral 102 are located opposite each other on the turntable 10. When the pawl 11 engages the ratchet, it prevents the lifting rod 8 from descending. When the turntable 10 is rotated, the pawl 11 and the ratchet automatically cooperate to position the turntable 10. The structure is simple and compact. In this embodiment, the ratchet can be a gear 101.

[0048] like Figure 8 , 9 As shown in Figure 10, a rotating shaft 103 is provided on the support frame, and the turntable 10 is rotatably mounted on the rotating shaft 103. The pawl 11 is connected to the rotating shaft 103 and can swing around the rotating shaft 103. The rotating shaft 103 is inclined relative to the rack 81, so that the disk surface of the turntable 10 is inclined relative to the rack 81, so that a portion of the helical teeth located on one side of the center of the helix 102 meshes with the rack 81, avoiding the entire helical teeth from engaging with the rack 81, thereby driving the turntable 10 to move relative to the rack 81.

[0049] The lifting rod 8 supports the upper shelf 2 via a telescopic frame 5. The telescopic frame 5 includes a crossbar 8282 and two parallel screws 12. The lifting rod 8 supports the crossbar 8282. A screw sleeve 13 is fitted onto the screw 12. The upper shelf 2 is rotatably connected to the screw sleeve 13. The screw 12 is rotated by a rotating device. A vertical baffle is provided on one end of the upper shelf 2 opposite to the screw sleeve 13. In this embodiment, the vertical baffle is the refrigerator back panel. A groove 4 is provided on the refrigerator back panel. The support rod is located in the groove 4. When the screw sleeve 13 moves toward the vertical baffle, the end of the upper shelf 2 can move up and down along the surface of the vertical baffle, thereby causing the upper shelf 2 to retract inward, which is equivalent to removing the upper shelf 2. This means that the upper shelf 2 is no longer obstructing the lower shelf. When users want to store tall items, they can do so by raising and lowering the upper shelf 2. When the upper shelf 2 is raised to its highest point and still cannot meet the user's storage needs, the upper shelf 2 can be retracted using the telescopic device to achieve the effect of maximizing the utilization of the volume.

[0050] like Figure 13 , 14 As shown in Figures 15 and 16, the rotation control device 15 includes two pulleys 151 mounted on the crossbar 8282. The two pulleys 151 are respectively connected to the two screws 12. The pulleys 151 of the two screws 12 are connected by the same transmission belt 152. One of the pulleys 151 is controlled to rotate by the screw motor, thereby controlling the two screws 12 to rotate synchronously through the rotation of one motor, and then controlling the two screw sleeves 13 to move synchronously along the screw 12.

[0051] The upper shelf 2 is provided with a guide wheel on one end, which is opposite to the vertical baffle, so that the upper shelf 2 can slide smoothly upward.

[0052] A telescopic rod 14 is connected between the side of the vertical baffle and the upper shelf 2. The two ends of the telescopic rod 14 are rotatably connected to the side of the vertical baffle and the upper shelf 2, respectively. The telescopic rod 14 serves to reinforce the structure and guide the movement of the shelf.

[0053] The support column 7 has screw holes 71, with the bottom screw holes 71 for fixing the support column 7 to the refrigerator. The connecting rod 9's fixing part 91 is inserted into the inclined groove 72 on the support column 7, and the connecting rod 9 is fixed to the support column 7 through the middle screw holes 71. The upper end of the lifting rod 8 is divided into crossbars 82 and 82, which serve as support for the upper shelf 2. The lower end of the lifting rod 8 is placed in the lifting groove 73, allowing the lifting rod 8 to move up and down within the lifting groove 73 to raise and lower the shelf. The rack 81 of the lifting rod 8 is placed in the opening 74 on the support column 7 to cooperate with the spiral 102 of the turntable 10.

[0054] The rotating shaft 103 of the turntable 10 has a round hole that fits onto the fixed shaft 92 of the gear 101 of the connecting rod 9. One side of the turntable 10 is the gear 101, and the other side is a spiral pattern 102. The spiral pattern 102 is a spiral with an increasingly smaller radius. The spiral part is connected to the rack 81 part on the lifting rod 8. The pawl 11 is provided with a bushing 111. The pawl 11 and the turntable 10 are fixed together on the fixed shaft 92 of the gear 101 of the connecting rod 9 through the screw hole 71 on the bushing 111. One end of the pawl 11 is provided with a lever 112. The front end of the lever 112 has a protrusion that is placed between the two teeth of the gear 101, which serves as a locking device.

[0055] A motor controls the rotation of the turntable 10; a motor is provided on the pawl 11 to control the shaft connected to the lever 112, so as to control the rotation of the lever 112.

[0056] The spiral pattern 102 behind the turntable 10 has a smaller and smaller radius. Therefore, when it rotates clockwise, it rotates in the direction of a smaller and smaller radius. The rack 81 of the lifting rod 8 moves downward under its action, and the shelf descends.

[0057] The specific lifting process is as follows: After receiving the signal, the motor starts to run, and the lever 112 rotates upward to release the device from locking. Then, the turntable 10 rotates under the control of the motor, causing the shelf to move upward. When it reaches the designated position, the lever 112 rotates downward under the control of the motor to lock the entire device.

[0058] On refrigerator 1, the distance between the upper shelf 2 and the lower shelf 3 is L1, the height between the upper shelf 2 and the upper liner is L2, and when the upper shelf 2 is raised to its highest point, the distance between the upper shelf 2 and the lower shelf is LMAX.

[0059] like Figure 17As shown, when an item needs to be placed on the refrigerator shelf, the height information of the item to be placed can be obtained first. Then, it is determined whether the distance L1 between the upper shelf 2 and the lower shelf is greater than the height of the item to be placed. If so, the item to be placed is placed on the lower shelf. If not, it is determined whether the height of the item to be placed is less than the maximum height LMAX that the upper shelf 2 can rise relative to the lower shelf. If so, the upper shelf 2 is raised to a height greater than the lower shelf using a lifting device. If not, it is determined whether there is an item on the upper shelf 2. If not, the screw 12 is rotated to make the upper shelf 2 retract toward the vertical baffle.

[0060] The height of items to be placed can be detected by manual input or by installing height detection sensors inside the refrigerator. For example, image recognition sensors can be used to achieve intelligent detection of the height of items to be placed.

[0061] In this embodiment, the turntable 10 and the lifting rod 8 are driven by an Archimedean rack and pinion 81. The Archimedean rack and pinion 81 transmission mechanism is a mechanical transmission device designed based on the Archimedean spiral principle, used to convert rotary motion into linear motion or vice versa. The main advantages of this transmission mechanism include high precision, high transmission efficiency, strong load capacity, and good stability.

[0062] An Archimedean thread is a planar curve, similar to a helix or spiral. It spirals outward along a central axis, with each turn parallel to the previous one and equidistant from the central axis. A key characteristic of the Archimedean thread is that the distance between each spiral arm (one turn of the helix) is equal, meaning the spacing between the spiral arms remains constant.

[0063] Archimedean threads, also known as Archimedean spiral teeth, are used in combination with rack 81 to manufacture telescopic devices. The Archimedean spiral teeth rotate and engage with rack 81 to achieve linear motion or telescoping. Such devices are commonly referred to as Archimedean spiral tooth telescoping mechanisms or spiral telescoping mechanisms. One end of the Archimedean spiral tooth is connected to a rotating shaft. When the shaft rotates, the spiral tooth rotates along the shaft and engages with rack 81. Rack 81 is a rod or shaft with Archimedean spiral teeth whose helical grooves perfectly match the Archimedean spiral teeth. When the Archimedean spiral tooth rotates, it moves on rack 81. Due to the geometric matching of the spiral tooth and rack 81, this results in linear motion or telescoping of rack 81. The telescoping motion of rack 81 can be controlled by rotating the Archimedean spiral tooth shaft. The direction and speed of rotation determine the direction and speed of telescoping. The combination of Archimedean spiral teeth and rack 81 provides a reliable way to achieve linear motion or telescoping with a certain degree of accuracy and load capacity. Furthermore, due to the geometric characteristics of the Archimedes' helical teeth, this mechanism is generally not easy to slide or will have very little friction when it does slide.

[0064] The ratchet mechanism used in this embodiment is used to convert rotary motion into intermittent or discontinuous linear or angular motion. It consists of a wheel (ratchet) and a toothed control lever (pawl 11), whose interaction allows or prevents movement only at specific positions or under specific conditions. The ratchet is a wheel or disc with a series of strong teeth. These teeth are typically evenly distributed along the edge or circumference of the wheel. The pawl 11 is a movable control lever with a section that grips the teeth. The movement of the pawl 11 is influenced by external drive or control; it can engage or disengage with the teeth of the ratchet. The main function of the ratchet mechanism is to convert continuous rotary motion into intermittent motion. When the ratchet teeth are gripped by the pawl 11, the wheel can drive the movement of the control lever, but when the pawl 11 is released, the wheel will rotate freely. Ratchet mechanisms offer good control and safety because they can be used to prevent unwanted movement or control the speed and direction of movement.

[0065] The screw 12 and sleeve 13 moving mechanism used in this embodiment is used to convert rotational motion into linear motion. It consists of two main parts: the screw 12 and the sleeve 13. The working principle of this mechanism is similar to that of the helical rack and pinion 81 transmission mechanism, but its primary purpose is to achieve linear movement, not rotation. The screw 12 is a long, helical shaft with a series of threads on its surface. These threads are typically helical, like a screw. When the screw 12 rotates, the threads engage with the threads of the sleeve 13. The sleeve 13 is a part that matches the screw 12, having the same or compatible threads. When the screw 12 rotates, the sleeve 13 moves linearly along the axis of the screw 12. The sleeve 13 is typically connected to a component that needs to move, such as a platform, carrier, or other object. The main function of the screw 12 and sleeve 13 moving mechanism is to convert rotational motion into linear motion. By rotating the screw 12, the sleeve 13 can be moved along the axis of the screw 12, achieving linear movement of the object. This type of mechanism typically possesses high precision and load capacity, making it highly useful in applications requiring precise control and support for large loads. Different types of screw 12 and sleeve 13 moving mechanisms exist, including ball screw 12, lead screw 12, and sliding screw 12. The screw 12 and sleeve 13 moving mechanism enables precise position control and linear motion.

[0066] In this embodiment, the two screws 12 are synchronously rotated using a pulley 151 transmission mechanism. The pulley 151 transmission is a mechanical transmission system that uses a belt or drive belt to transfer power from one wheel to another to achieve rotational motion. This transmission system typically consists of two or more pulleys 151 (also called gears 101 or rollers) and a drive belt. The drive belt is usually made of rubber or other elastic material, and its shape can match the contour of the pulleys 151. The drive belt can be flat or toothed, depending on the power and type of motion to be transmitted. The pulleys 151 are wheels or rollers that contact the drive belt and transmit power. The pulleys 151 can have different diameters and shapes to change the transmission ratio and speed. Generally, the drive belt overlaps the pulleys 151 and transmits power as the pulleys 151 rotate. Different transmission ratios can be achieved by selecting pulleys 151 of different sizes. This allows the output speed and torque in the transmission system to be adjusted to meet specific application requirements. Belt drives (151 pulley drives) are generally quieter and smoother than other drive systems (such as chain drives or gear drives). They reduce noise and vibration, making them advantageous in certain applications. Belt drives typically require less maintenance compared to some other drive systems. The drive belt is relatively easy to replace and does not require lubrication.

[0067] Although this document uses a number of technical terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention. The order of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless otherwise expressly specified, and provided that the output of a preceding process is not used in a subsequent process. Similar sequential terms used for descriptive convenience (e.g., "firstly," "next," "secondly," "again," "then," etc.) do not imply that the actions must be performed in such an order.

[0068] Those skilled in the art will understand that all directional references (e.g., above, below, up, up, down, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to aid the reader's understanding and do not imply (e.g., a limitation on the scope of the invention as defined by the appended claims) a limitation on the scope of the invention as defined by the appended claims. They are merely for the purpose of facilitating the description of this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation. The directional terms "inside" and "outside" refer to inside or outside relative to the outline of the respective component itself.

[0069] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0070] Additionally, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or minor deviations in conditions, quantities, values, or dimensions, some of which are within manufacturing tolerances or limits. It should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components; unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0071] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art can make various modifications or additions to the described embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A lifting shelf, comprising an upper shelf and a support frame supporting the upper shelf, characterized in that, The support frame includes a lifting device for supporting the upper shelf. The lifting device includes a lifting rod supporting the upper shelf and a drive mechanism for controlling the lifting rod's movement. A rack is provided on the lifting rod, and a turntable is provided on the support frame. The turntable has spiral patterns that engage with the rack. A rotating shaft is provided on the support frame, and the turntable is rotatably mounted on the rotating shaft. The rotating shaft is inclined relative to the rack, such that a portion of the spiral teeth located on one side of the center of the spiral patterns mesh with the rack. The lifting rod supports the upper shelf via a telescopic frame. The telescopic frame includes a crossbar and two parallel screws. Screws are fitted onto the screws, and the upper shelf is rotatably connected to the screws. The screws are controlled to rotate by a rotation control device. A vertical baffle is provided on one end of the upper shelf opposite to the screws. When the screws move toward the vertical baffle, the end of the upper shelf can move up and down along the surface of the vertical baffle.

2. The lifting shelf according to claim 1, characterized in that, The turntable is positioned relative to the support frame via a ratchet mechanism.

3. The lifting shelf according to claim 2, characterized in that, The ratchet mechanism includes a ratchet located on the turntable and a pawl located on the support frame. The ratchet is located on the other side of the turntable opposite to the helical groove. When the pawl engages the ratchet, it prevents the lifting rod from descending.

4. The lifting shelf according to claim 3, characterized in that, The pawl is oscillating around the pivot and is connected to the pivot.

5. The lifting shelf according to claim 1, characterized in that, The rotation control device includes two pulleys mounted on the crossbar. The two pulleys are respectively connected to the two screws. The pulleys of the two screws are connected by the same transmission belt, and one of the pulleys is controlled to rotate by a screw motor.

6. The lifting shelf according to claim 1, characterized in that, The upper shelf is provided with guide wheels on one end, which are opposite to the vertical baffle.

7. The lifting shelf according to claim 1, characterized in that, A telescopic rod is connected between the side of the vertical baffle and the upper shelf, and the two ends of the telescopic rod are rotatably connected to the side of the vertical baffle and the upper shelf, respectively.

8. The lifting shelf according to claim 1, characterized in that, It also includes a lower shelf located below the upper shelf and a distance detection sensor for detecting the distance between the upper shelf and the lower shelf, and a pressure sensor is provided on the upper shelf.

9. A refrigerator, characterized in that, Includes the lifting shelf as described in any one of claims 1 to 8.

10. A control method, said control method being applied to the lifting shelf according to claim 8; characterized in that, The control method includes: acquiring the height information of the item to be placed, determining whether the distance between the upper shelf and the lower shelf is greater than the height of the item to be placed; if so, placing the item on the lower shelf; if not, determining whether the height of the item to be placed is less than the maximum height that the upper shelf can rise relative to the lower shelf; if so, using a lifting device to raise the upper shelf to a height greater than the required height; if not, determining whether there is an item on the upper shelf; if not, rotating the screw to retract the upper shelf toward the vertical baffle.

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