Refrigerator with lifting shelves

Abstract

The present invention discloses a refrigerator with a lifting shelf, which includes a storage room, a lifting shelf and a shelf driving mechanism in the storage room, the shelf driving mechanism including: guide rails respectively fixed to opposite sides of the storage room, a support member slidably connected to the guide rail, the lifting shelf is fixedly connected to the support member; and a driving motor, a first pulley is fixed on the output shaft of the driving motor; second pulleys for converting the traction direction of a traction rope are respectively provided on the left and right sides of the storage room, one end of the two traction ropes is respectively fixed on the first pulley, the middle position of the two traction ropes respectively bypasses the second pulleys located on both sides of the storage room, and the other end of the traction rope is respectively fixed on the support member; and also includes a traction rope position adjustment device for adjusting the position of the traction rope. The shelf of the present invention can be automatically lifted and lowered to facilitate users to store food of different heights. At the same time, the position of the traction rope can be adjusted to avoid the tilt of the shelf due to improper adjustment of the length of the traction ropes on both sides.

Description

Technical Field

[0001] The invention relates to the field of intelligent household appliances, and in particular to a refrigerator with shelves capable of automatically rising and falling. Background Art

[0002] As the quality of life continues to improve, multi-door refrigerators with large capacity, multiple functions and classified storage are becoming more and more popular, and people's requirements for the intelligence of refrigerator products are also getting higher and higher.

[0003] Most of the shelves in existing refrigerator products are fixed in position. Usually, ribs are formed on opposite sides of the refrigerator liner, and the shelves can be placed on the ribs. In order to facilitate user adjustment, several ribs are usually reserved in the refrigerator design to adjust the position of the shelves. However, the height between the shelves cannot adapt to the placement of items of different volumes, the storage space has certain limitations, the space utilization rate inside the refrigerator is low, and many larger foods cannot be placed, affecting the user experience. In addition, in recent years, the demand for large-volume refrigerators has increased, which has led to an increase in the height of refrigerators. As a result, it is difficult to access items on the top shelf of the refrigerator, which has also become a problem that bothers users.

[0004] In order to solve the above technical problems, the prior art provides a shelf structure that can be automatically lifted and lowered, such as Figure 1 , Figure 2 As shown, the mechanism for driving the lifting of the shelf includes a screw 33 and a nut 34. The power part drives the screw 33 to rotate, so that the nut 34 moves up and down in a straight line. The nut 34 is connected to the housing 321 of the slider assembly 32 to drive the slider assembly 32 to move up and down along the guide rail 31. The power part includes a motor 35, a first rotating shaft 38 and a second rotating shaft 39. The output shaft of the motor 35 is connected to the first rotating shaft 38 through a belt 36 to drive the first rotating shaft 38 to rotate. One side of the first rotating shaft 38 transmits the rotational motion to the screw 33 of a group of lifting mechanisms through a worm gear reduction mechanism. This automatic shelf lifting device converts the worm gear mechanism and the screw nut mechanism into linear motion through the motor. The structure is complex. The worm gear mechanism and the screw nut mechanism both occupy a large space, which affects the effective storage space of the storage room. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing refrigerator lifting shelves occupy a large space. To this end, the present invention provides a refrigerator automatic lifting shelf with a simple structure and small space occupation.

[0006] In view of the above technical problems, the present invention provides the following technical solutions:

[0007] A refrigerator with a lifting shelf, comprising a storage chamber, wherein the storage chamber is provided with a lifting shelf and a shelf driving mechanism for driving the lifting shelf to move up and down, the shelf driving mechanism comprising: guide rails respectively fixed to opposite sides of the storage chamber, a support member slidably connected to the guide rails, the lifting shelf being fixedly connected to the support member; and a driving motor, a first pulley being fixed to the output shaft of the driving motor; second pulleys for converting the traction direction of a traction rope are respectively provided on the left and right sides of the storage chamber, one end of the two traction ropes are respectively fixed to the first pulleys, the middle positions of the two traction ropes respectively pass around the second pulleys located on both sides of the storage chamber, and the other ends of the traction ropes are respectively fixed to the support members; and also includes a traction rope position adjustment device for adjusting the length of the traction rope.

[0008] The technical solution of the present invention has the following technical effects compared with the prior art:

[0009] The refrigerator of the present invention is provided with a shelf and a shelf driving mechanism. The shelf can be moved up and down under the drive of the shelf driving mechanism, so that the user can store food of different heights. The shelf driving mechanism includes a guide rail and a support member slidably connected to the guide rail, and the shelf is fixedly connected to the support member; the driving motor drives the support member to move up and down along the guide rail through the traction rope. Since the transmission method of the shelf driving mechanism adopts the traction rope traction method, compared with the existing worm gear mechanism and lead screw nut mechanism that converts into linear motion, the structure is simple and occupies less space. At the same time, the shelf also includes a traction rope position adjustment device for adjusting the length of the traction rope, which can avoid the problem of the skewing of the two sides of the shelf due to improper adjustment of the length of the traction ropes on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the objects and advantages of the present invention, wherein:

[0011] Figure 1 A refrigerator with automatic lifting shelves in the prior art;

[0012] Figure 2 It is a schematic diagram of a driving mechanism of an automatic lifting shelf in the prior art;

[0013] Figure 3 A three-dimensional diagram of a refrigerator with automatic lifting shelves in Example 1 of the present invention;

[0014] Figure 4 It is a three-dimensional structural schematic diagram of a shelf driving mechanism of a lifting shelf in Example 1 of the present invention;

[0015] Figure 5 This is a schematic diagram of the installation structure of the drive motor in Example 1 of the present invention;

[0016] Figure 6 This is a schematic diagram of the guide rail structure in Example 1 of the present invention;

[0017] Figure 7 This is a schematic diagram of the structure of the lifting shelf in Example 1 of the present invention;

[0018] Figure 8 A diagram showing the connection relationship between the lifting shelf and the supporting member in Example 1 of the present invention;

[0019] Fig. 9 It is a schematic diagram of the shelf driving mechanism with an emergency stop device in case of encountering an obstacle in Example 1 of the present invention under normal working conditions;

[0020] Fig.10 It is a schematic diagram of the shelf driving mechanism with an emergency stop device in case of encountering an obstacle in Example 1 of the present invention when the shelf encounters an obstacle;

[0021] Fig.11 This is a circuit diagram of a power supply reversing signal having an emergency stop device in case of an obstacle in Embodiment 1 of the present invention;

[0022] Fig.12 This is a schematic diagram of the lifting shelf in Example 1 of the present invention rising to the highest position;

[0023] Fig.13 This is a schematic diagram of the lifting shelf in Example 1 of the present invention descending to the lowest position;

[0024] Fig.14 It is a schematic cross-sectional view of the refrigerating chamber along the horizontal direction in Embodiment 1 of the present invention;

[0025] Fig.15 is another cross-sectional schematic diagram of the refrigerating chamber in the horizontal direction in Embodiment 1 of the present invention;

[0026] Fig.16 is a three-dimensional diagram of a decorative plate in Example 1 of the present invention;

[0027] Fig.17 It is a rear view of the decorative plate in Example 1 of the present invention;

[0028] Fig.18 This is a diagram showing the coordination of the middle decorative plate and the shielding plate in Example 1 of the present invention;

[0029] Fig.19 An exploded view of the shielding plate in Example 1 of the present invention;

[0030] Fig. 20 This is a state diagram of the shielding plate when the middle shelf is at the lowest position in Example 1 of the present invention;

[0031] Fig.21 This is a state diagram of the shielding plate when the middle shelf is at the highest position in Example 1 of the present invention;

[0032] Fig. 22 The front and back views of the decorative plate and the shielding plate when the middle shelf is at the lowest position in Example 1 of the present invention;

[0033] Fig.23 The front and back views of the decorative plate and the shielding plate when the middle shelf is located at the middle position in Example 1 of the present invention;

[0034] Fig.24 The front and back views of the decorative plate and the shielding plate when the middle shelf is at the highest position in Example 1 of the present invention;

[0035] Fig.25 This is a schematic diagram of the automatic lifting shelf structure equipped with a traction rope position adjustment device and a micro switch position adjustment device in Example 2 of the present invention;

[0036] Fig.26 Schematic diagram of the structure of the traction rope position adjustment device and the micro switch position adjustment device in Example 2 of the present invention;

[0037] Fig. 27 Schematic diagram of the structure of the traction rope position adjustment device in Embodiment 2 of the present invention;

[0038] Fig.28 A three-dimensional diagram of an adjustment plate and a pressing member of a traction rope position adjustment device in Embodiment 2 of the present invention;

[0039] Fig.29 It is a schematic diagram of the structure of the fixing plate in Embodiment 2 of the present invention;

[0040] Fig.30 It is a schematic diagram of the partial structure of the fixing plate in Example 2 of the present invention;

[0041] Fig.31 Schematic diagram of the structure of the micro switch position adjustment device in Example 2 of the present invention;

[0042] Fig.32 This is a schematic diagram of the structure of the mounting base in Embodiment 2 of the present invention;

[0043] Fig.33 is a schematic diagram of a traction rope in an unadjusted initial state in Embodiment 2 of the present invention;

[0044] Fig.34 This is a state diagram of the traction rope after the traction rope position adjustment device in Example 2 of the present invention has adjusted it.

[0045] The reference numerals in the figure are:

[0046] 100-storage room, 100A-freezer, 100B-refrigerator, 200-door, 200A-freezer door, 200B-refrigerator door;

[0047] 101-storage drawer, 102-fixed shelf, 103-lifting shelf, 1031-shelf body, 1032-shelf support frame, 1033-hook, 104-motor reinforcement iron, 105-guide rail reinforcement iron, 106-motor installation slot, 107-guide rail installation slot, 108-shelf lifting control button,

[0048] 300-shelf driving mechanism, 301-guide rail, 3011-outer rail, 3012-inner rail, 3013-ball, 302-support, 3021-hanging hole, 303-drive motor, 3031-output shaft, 304-traction rope, 305-first pulley, 3051-sleeve body, 3052-blocking piece, 306-second pulley, 307-traction rope fixing piece, 308-travel switch;

[0049] 401-air duct cover, 402-air outlet;

[0050] 501-decorative plate, 5011-first opening, 5012-guiding portion, 5013-low position limiting portion, 5014-wind guide surface, 502-shielding plate, 5021-first shielding plate, 50211-sliding rib, 50212-first stopper, 50213-limiting protrusion, 50214-second opening, 5022-second shielding plate, 50221-sliding groove, 50222-second stopper;

[0051] 601- micro switch, 6011- detection arm, 6012- annular sleeve, 601A- first micro switch, 601B- second micro switch, 602- power switching chip, 603- diode.

[0052] 700-traction rope position adjustment device, 701-adjusting plate, 702-pressing member, 7021-fixed shaft, 7022-rotating wheel, 70221-slideway, 703-fixed plate, 703A-first threaded hole, 7031-fixed plate body, 7032-first mounting plate, 7033-second mounting plate, 70331-positioning shaft, 704-adjusting bolt, 705-reset spring, 706-guide column, 7061-first shaft, 7062-second shaft, 707-guide groove, 7071-guide section, 7072-plug section;

[0053] 800-micro switch position adjustment device, 801-mounting seat, 8011-arc adjustment hole, 8012-circular mounting hole.

[0054] 900-tension spring. DETAILED DESCRIPTION

[0055] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] Figure 3 is a stereogram of a specific embodiment of the refrigerator of the present invention; Figure 3 The refrigerator 1 of this embodiment has an approximately rectangular parallelepiped shape. The appearance of the refrigerator 1 is defined by a storage chamber 100 defining a storage space and a plurality of door bodies 200 disposed in the storage chamber 100. The storage chamber 100 has an open box body, which is formed by a storage chamber inner liner, a storage chamber outer shell, and a foaming layer located therebetween. The storage chamber 100 is vertically divided into a freezing chamber 100A below and a refrigerating chamber 100B above. Each of the separated spaces may have an independent storage space.

[0060] In detail, the freezing chamber 100A is defined at the lower side of the storage chamber 100 and can be selectively covered by a drawer-type freezing chamber door 200A. The space defined above the freezing chamber 100A is partitioned into left and right sides to respectively define a refrigerating chamber 100B. The refrigerating chamber 100B can be selectively opened or closed by a refrigerating chamber door body 200B pivotably mounted on the refrigerating chamber 100B.

[0061] The storage room 100 in the embodiment of the present invention includes a storage drawer 101 located at the lower side. The storage drawer has two layers, including two dry and wet fresh-keeping drawers located at the lower layer, and a wider storage drawer located on the upper side of the dry and wet fresh-keeping drawers for storing longer food ingredients; the storage room 100 also includes a shelf located on the storage drawer 101; wherein the shelf includes a fixed shelf 102 and a lifting shelf 103; the fixed shelf 102 is a shelf that cannot be moved up and down after installation. Usually, ribs are formed on the inner walls of both sides of the storage room 10, and the fixed shelf 102 is placed on the ribs. The lifting shelf 103 is a shelf that can be adjusted up and down after installation. Specifically, the lifting shelf 103 moves up and down under the drive of the shelf driving mechanism 300.

[0062] The relative position of the lifting shelf 103 and the fixed shelf 102 is not unique. The fixed shelf 102 can be located at the upper side, or the lifting shelf 103 can be located at the upper side. Preferably, in this embodiment, the lifting shelf 103 is located at the upper side. In this way, when the overall height of the refrigerator is high and the user cannot store food on the uppermost shelf, the lifting shelf 103 can be adjusted to move down and store food, which is convenient for the user.

[0063] like Figure 4 , Figure 5 As shown, the shelf driving mechanism 300 includes: a guide rail 301 fixed in the storage chamber 100, a support member 302 slidably connected to the guide rail 301, and the lifting shelf 103 is fixedly connected to the support member 302; it also includes a driving motor 303 for driving the support member 302 to lift and lower, the output shaft 3031 of the driving motor 303 is wound around a traction rope 304, and the other end of the traction rope 304 is connected to the support member 302; when the lifting shelf 103 needs to move downward, the output shaft 3031 of the driving motor 303 is controlled to rotate in a first direction, the traction rope 304 is extended, and the lifting shelf 103 moves downward under the action of gravity; when the lifting shelf 103 needs to move upward, the output shaft of the driving motor 303 is controlled to rotate in a second direction (the opposite direction of the first direction), the traction rope 304 is gradually wound, and the lifting shelf 103 moves upward. Since the transmission mode of the shelf driving mechanism adopts the traction rope traction mode, compared with the existing worm gear mechanism and lead screw nut mechanism converted into linear motion, the structure is simple and occupies less space.

[0064] In order to facilitate the user to control the lifting of the lifting shelf 103, Figure 3 As shown, a shelf lifting control button 108 is provided on the side wall of the storage chamber 100, and the shelf lifting control button 108 is used by a user to control the driving motor to rotate forward, reverse or stop.

[0065] Specifically, in one embodiment, the shelf lifting control buttons 108 include three buttons: an ascending button, a descending button, and a stop button; the ascending button is located on the upper side and has an upward arrow mark, the stop button is located in the middle and has a stop mark, and the descending button is located on the lower side and has a downward arrow mark. In another embodiment, the shelf lifting control buttons 108 include two buttons, namely an ascending / stop button and a descending / stop button. The ascending / stop button is used to control the ascending or ascending stop of the lifting shelf 103; the descending / stop button is used to control the descending or descending stop of the lifting shelf 103.

[0066] In one embodiment, in the shelf driving mechanism 300, a guide rail 301 and a support member 302 are respectively provided, the guide rail 301 is installed on the rear side wall of the storage room 100, and the support member 302 is fixedly connected to the middle and rear position of the lifting shelf 103; the driving motor 303 is arranged on the upper side of the guide rail 301. In this way, the traction distance of the traction rope 304 is shorter, the structure is simpler, and the production cost is lower. However, in this embodiment, the lifting shelf 103 is only supported and fixed in the middle position. If the weight difference of the items placed on both sides is large, the lifting shelf 103 may tilt.

[0067] In another embodiment, if Figure 4 As shown, in order to make the lifting shelf 103 move up and down more stably, the guide rails 301 are set in two, which are respectively located on the opposite sides of the storage room 100, and the driving motor 303 is set on the rear side of the storage room 100. A first pulley 305 is fixed on the output shaft of the driving motor 303; the left and right sides of the storage room 100 are respectively provided with second pulleys 306 for converting the traction direction of the traction rope, one end of the two traction ropes 304 is respectively fixed on the first pulley 305, and the middle positions of the two traction ropes 304 are respectively passed around the second pulley 306, and the other ends of the traction ropes 304 are respectively fixed on the support member 302.

[0068] Specifically, Figure 5 As shown, the first pulley 305 includes a sleeve body 3051 sleeved on the output shaft 3031 of the driving motor 303 and three radially extending baffles 3052, and the traction ropes 304 that respectively pull the left and right side support members 302 are separated by the baffles 3052.

[0069] Specifically, Figure 6As shown, the guide rail 301 is selected as a steel ball slide rail, and the steel ball slide rail includes an outer rail 3011, an inner rail 3012, and a ball 3013 located therebetween; the outer rail 3011 is fixed to the side wall of the storage chamber 100, and the support member 302 is fixedly connected to the inner rail 3012. The steel ball slide rail can make the lifting shelf 103 only need to overcome rolling friction when moving up and down, and under the same load, only a small driving force is needed to move the lifting shelf 103 up and down.

[0070] The lifting shelf 103 and the support member 302 may be fixedly connected in different ways, and may be fixed by threads or by snap-fit ​​connections. Figure 7 As shown, in this embodiment, the lifting shelf 103 includes a shelf body 1031 and a shelf support frame 1032 for supporting the shelf body 1031, the shelf support frame 1032 is fixedly connected to both sides of the lower part of the shelf body 1031, and the rear side of the partition support frame 1032 is provided with a hook 1033; the support member 302 is provided with a hanging hole 3021, such as Figure 8 As shown, the hook 1033 of the partition support frame 1032 is hooked on the hanging hole 3021 of the support member 302. This hooking method has high reliability and is convenient for users to disassemble and clean the lifting shelf 103.

[0071] There is no unique way to connect the support member 302 and the traction rope 304. In one embodiment, a connection hole is formed on the upper side of the support member 302, and the traction rope 304 is directly connected to the connection hole. In this way, the support member 302 fixes both the lifting shelf 103 and the traction rope 304, which requires a high support capacity. Therefore, in this embodiment, preferably, Figure 8 As shown, a traction rope fixing member 307 is provided on the upper side of the support member 302, and the traction rope fixing member 307 is fixedly connected to the inner rail 3012. The traction rope fixing member 307 and the support member 302 are independent of each other, and support the lifting shelf 103 and the traction rope 304 respectively, so that the supporting performance is easy to ensure, and the manufacturing and assembly are relatively easy.

[0072] When the lifting shelf 103 is moving up and down, there is a possibility that an object will block the lifting shelf 103. At this time, it is necessary to immediately stop the lifting shelf 103 from moving further to avoid the lifting shelf 103 from tilting on one side and causing the objects on the lifting shelf 103 to fall over. Therefore, the shelf driving mechanism 300 also includes an obstruction emergency stop device, which is used to control the driving motor to stop when the lifting shelf encounters resistance when it is rising or falling. In order to ensure the safety of the upward and downward movement of the lifting shelf 103, the obstruction emergency stop device includes a downward obstruction emergency stop device and an upward obstruction emergency stop device. The downward obstruction emergency stop device is used to ensure that the lifting shelf 103 stops moving downward when it encounters an object blocking it when it moves downward, and the upward obstruction emergency stop device is used to ensure that the lifting shelf 103 stops moving upward when it encounters an object blocking it when it moves upward. Specifically, the downward resistance emergency stop device and the upward resistance emergency stop device can be implemented by detecting the current of the drive motor 303. Specifically, a current sensor for detecting the current size is set on the drive motor 303. When the lifting shelf 103 moves upward or downward and encounters resistance, the current of the drive motor 303 suddenly changes. At this time, the controller controls the drive motor to stop running. In the above-mentioned resistance emergency stop device, since the start and stop of the drive motor is controlled by the current change threshold, if the threshold setting is not reasonable, for example, if it is set too large, the lifting shelf 103 cannot stop in time. If it is set too small, the lifting shelf 103 stops at a position where it should not stop.

[0073] In order to provide an obstacle emergency stop device that can more accurately control the lifting shelf 103 to stop when encountering resistance, as Fig. 9 , Fig.10 As shown, the downward resistance emergency stop device includes a micro switch 601, and the micro switch 601 is fixed on the rear wall of the refrigerating chamber 100B. The detection arm 6011 of the micro switch 601 is provided with an annular sleeve 6012, which is sleeved on the traction rope 304. Preferably, the annular sleeve 6012 is sleeved on the traction rope section between the first pulley 305 and the second pulley 306. Under normal circumstances, the traction rope 304 Fig. 9 As shown, since the lifting shelf 103 is in a tensioned state under the action of gravity, the detection arm 6011 of the micro switch 601 maintains a consistent position under normal working conditions, and the circuit is in a normally closed state. When the lifting shelf 103 encounters an obstacle on the way down, as shown in FIG. Fig.10As shown, the traction rope 304 changes from a tensioned state to a relaxed state, at which time the position of the detection arm 6011 of the micro switch 601 changes from a normally closed state to a normally open state, at which time the control unit cuts off the circuit, the drive motor 303 stops rotating, and the lifting shelf 103 stops descending. Since the traction rope will change position immediately when it encounters an obstacle, the micro switch 601 detects the position of the traction rope 304 to improve the response speed and detection reliability.

[0074] Fig.11 It is a power reversing signal circuit diagram of an emergency stop device in case of an obstruction; it includes a power reversing chip 602, which is used to switch the polarity of the output end according to the signal input information, and the first micro switch 601A and the second micro switch 601B located on both sides of the traction rope 304 are connected in series with each other and then in parallel with the diode 603, and then connected in series with the drive motor 303 and then connected to the two output ends of the power reversing chip 602, wherein the anode of the diode 603 is connected to the drive motor 303, and the cathode of the diode 603 is connected to the power reversing chip 602.

[0075] Specifically, the input end of the power switching chip 602 includes a +24V power interface and a GND end connected to the positive and negative poles of the 24V DC power supply, and a signal input end connected to the I / O port of the single-chip microcomputer to send a switching signal; the two output ends of the power switching chip are connected in series in the loop to provide a power signal for the emergency stop device when encountering an obstacle. When the signal input end receives the switching signal sent by the single-chip microcomputer, the power polarity of the two output ends is swapped up and down (e.g., from the upper end +24V and the lower end GND to the upper end GND and the lower end +24V).

[0076] When the lifting shelf is descending normally, the two output ends of the power commutation chip 602 are +24V at the upper end and GND at the lower end. At this time, the current direction in the circuit is clockwise, and the current flows through the first micro switch 601A and the second micro switch 601B on the two traction ropes 304, and then flows through the drive motor 303. The drive motor 303 rotates to drive the lifting shelf 103 to descend. At this time, the lifting shelf 103 encounters obstacles during the descent process, causing the traction rope 304 to become loose, and one or both of the first micro switch 601A and the second micro switch 601B will be disconnected, so that the original circuit is cut off, the drive motor 303 stops rotating, and the lifting shelf 103 stops descending. At this time, the lifting shelf 103 will not move if the descending button is pressed again, but the lifting shelf 103 can be raised by pressing the ascending button. When the up button is pressed, the microcontroller receives the button information and sends a power reversing signal to the power reversing chip 602 through the signal input terminal. The power of the two output terminals of the power reversing chip 602 is reversed, and the upper end is GND and the lower end is +24V. At this time, the loop current becomes counterclockwise. Although the micro switch 601 (the first micro switch 601A and / or the second micro switch 601B) is disconnected, the current flows through the drive motor 303 and can be turned on through the diode 603, so the drive motor 303 rotates in the opposite direction, and the lifting shelf 103 rises. When the lifting shelf 103 rises a certain distance, the two micro switches 601A / 601B are restored to the on state, and the down button resumes its function. The up and down buttons can be used to freely control the rise and fall of the shelf.

[0077] Specifically, in order to further accurately control the moving position of the lifting shelf 103, the refrigerator further includes a shelf travel control device, which includes a travel switch 308 arranged on the rear inner wall of the storage chamber 100, the travel switch 308 is connected in series with the drive motor 303, and the travel switch 308 is in a normally closed state. Fig.12 As shown, when the lifting shelf 103 moves to the set highest position, the travel switch 308 is triggered to open, and the drive motor 303 stops; Fig.13 As shown, when the lifting shelf 103 moves to the set lowest position, the travel switch 308 is triggered to open, and the drive motor 303 stops. In order to further reduce the space occupied by the shelf drive mechanism 300 in the storage room 100, as shown in FIG. Figure 5 As shown, the rear wall of the storage chamber 100 is formed with a motor installation groove 106, and the inner side of the rear wall of the storage chamber 100 is provided with a motor reinforcement iron 104, and the drive motor 303 installed in the motor installation groove 106 is connected to the motor reinforcement iron 104 by bolts. Fig.14 , Fig.15As shown, the left and right side walls of the storage room 100 are formed with guide rail mounting grooves 107, the inner sides of the left and right side walls of the storage room 100 are provided with guide rail reinforcement irons 105, and the guide rails 301 installed in the guide rail mounting grooves 107 are connected to the guide rail reinforcement irons 105 by bolts. In this way, the two larger parts of the shelf driving mechanism 300: the driving motor 303 and the guide rail 301 are both embedded in the mounting grooves on the inner side of the inner wall of the storage room, and the entire shelf driving mechanism 300 occupies very little space.

[0078] In order to make the interior of the storage room 100 more beautiful and better integrated, it also includes a decorative structure covering the above-mentioned shelf driving mechanism 300. Specifically, when the refrigerator is a direct cooling refrigerator and no air duct structure is arranged on the inner side of the storage room 100, it can use an integral panel to cover the entire area where the shelf driving mechanism 300 is located, and openings are arranged on both sides of the panel, and the lifting shelf 103 can move up and down along the openings.

[0079] In this embodiment, the refrigerator 1 is an air-cooled refrigerator. Fig.14 , Fig.15 As shown, an air duct assembly is provided at the rear inner wall of the storage chamber 100, wherein the air duct assembly includes an air duct cover plate 401 and an air duct foam (not shown in the figure), the air duct foam is located at the rear side of the air duct cover plate 401, and is snap-connected to the rear wall of the refrigerating chamber through the air duct cover plate 401, a duct structure is formed inside the air duct foam, and a plurality of air outlets 402 are respectively provided on both sides of the air duct foam, and the air duct assembly supplies air to the refrigerating chamber 100B through the plurality of air outlets 402.

[0080] The decorative structure covering the shelf drive mechanism 300 includes two parts, one of which is the air duct cover 401 covering the drive motor 303 and the upper part of the traction rope 304. Since the drive motor 303 is installed on the rear wall of the cold storage room 100B, the air duct cover 401 can be cleverly used to cover the drive motor 303 and the upper part of the traction rope 304 to improve the overall appearance of the cold storage room. The other part is a decorative plate 501 covering the area where the guide rail 301 is located. The decorative plate 501 is located on the left and right sides of the air duct cover 401. The decorative plate 501 is used to lift the shelf. Fig.14 , Fig.15 As shown, one end of the decorative panel 501 is clamped in the guide rail mounting groove 107, and the other end is fixed to the rear wall of the cold storage room 100B by two screws, and the two sides of the air duct cover 401 can cover part of the panel surface of the decorative panel 501. In this way, the integrity of the storage room can be maintained, and the guide rails and pulley assemblies are prevented from being exposed to the outside, which may affect the lifting and lowering of the lifting shelves when storing items.

[0081] The decorative plate 501 is provided with an air guide surface 5014 at the air outlet 402 of the air duct assembly 400, for guiding the air outlet direction of the air duct assembly. Specifically, the air guide surface 5014 is an inclined surface or an inwardly concave arc surface. By providing the air guide surface 5014 at the air outlet 402, it is possible to prevent the decorative plate 501 from blocking the air outlet of the air duct assembly 400, thereby affecting the refrigeration effect of the refrigeration chamber.

[0082] like Fig.16 , Fig.17 , Fig.18 As shown, the decorative panel 501 is provided with a first opening 5011 extending up and down, and the shelf support frame 1032 of the lifting rack 103 is passed through the first opening 5011, and the lifting rack 103 can move up and down along the first opening 5011; in order to prevent the lifting rack 103 from sliding and rubbing against the side wall of the first opening 5011 when moving up and down, the area of ​​the first opening 5011 is set slightly larger to prevent the two from contacting each other. Therefore, the shelf driving mechanism arranged inside is exposed through the first opening 5011, and when food in the refrigerator storage chamber enters the inside, it will affect the reliability of the shelf driving mechanism; therefore, the decorative panel 501 is provided with a shielding plate 502 on the side away from the lifting rack 103, and the shielding plate 502 is provided with a second opening 50214 matching the size of the shelf support frame, and the shelf support frame is plugged into the second opening 50214, and the shielding plate 502 can move up and down with the lifting rack 103 and cover at least part of the first opening 5011.

[0083] In this way, the shielding plate 502 can shield most of the first opening 5011, and when the lifting shelf 103 moves up and down, the shielding plate 502 moves accordingly, and the shielding plate 502 does not affect the movement of the lifting shelf. The above shielding structure avoids the risk of foreign matter entering the interior due to the communication between the inside and the outside. At the same time, it ensures the lifting reliability of the lifting shelf 103.

[0084] The shielding plate 502 may be fixedly installed in various ways. It may be independently slidably connected to the guide plate located at the rear side of the decorative plate. In this way, since there is still a gap between the shielding plate 502 and the decorative plate 501, it is not possible to completely prevent foreign matter from entering. Therefore, in this embodiment, the shielding plate 502 is slidably connected to the rear surface of the decorative plate 501. Specifically, the decorative plate 501 is provided with a guide portion 5012, and the shielding plate 502 may be slidably connected to the guide portion 5012 up and down.

[0085] The structure of the guide portion 5012 is not unique, and it can be used as long as the shielding plate 502 can slide longitudinally thereon. Fig.17As shown, the guide portion 5012 is a plurality of L-shaped guide ribs formed on the decorative plate 501, and the L-shaped guide ribs are arranged in two rows along the longitudinal direction, and the shielding plate 502 is located between the two rows of L-shaped guide ribs. In this way, when installing the shielding plate 502, the L-shaped guide ribs can be bent outward to complete the installation, and the whole process is convenient and quick; and because there are fewer sliding friction surfaces, the shielding plate 502 slides more smoothly.

[0086] In one embodiment, the shielding plate 502 is an integral plate structure, and its length is greater than about twice the height of the first opening to ensure that the shielding plate 502 always covers the first opening 5011 when the lifting shelf 103 is at the lowest position or the highest position.

[0087] Since the lifting distance of the lifting shelf 103 is relatively large, if the shielding plate 502 is set as an integral plate, when it moves downward to the lowest position, the lower end of the shielding plate 502 extends downward too much to affect the fixation of the lower fixed shelf 102, or, when the lifting shelf 103 moves upward to the highest position, the upper end of the shielding plate 502 extends upward too much to hit the top wall of the storage room; Fig.19 As shown, the baffle plate 502 includes a first baffle plate 5021 and a second baffle plate 5022 which are slidably connected to each other, the second opening 50214 is arranged on the first baffle plate 5021, and the second baffle plate 5022 is located on the upper side and / or lower side of the second opening 50214; when the second baffle plate 5022 is located on the upper side of the second opening 50214, the decorative panel 501 is provided with a high position limiting portion (not shown in the figure) for limiting the highest position of the second baffle plate 5022; when the second baffle plate 5022 is located on the lower side of the second opening 50214, the decorative panel 501 is provided with a low position limiting portion for limiting the lowest position of the second baffle plate 5022.

[0088] In this way, by providing the first baffle plate 5021 and the second baffle plate 5022 which can slide relative to each other, when the lifting shelf 103 moves upward, the upper limit portion limits the uppermost position of the second baffle plate 5022, and the second baffle plate 5022 slides to the inner side of the first baffle plate 5021, thereby avoiding the risk of the second baffle plate 5022 continuing to move upward and hitting the top wall of the storage room; when the lifting shelf 103 moves downward, the lower limit portion limits the lowermost position of the second baffle plate 5022, and the second baffle plate 5022 slides to the inner side of the first baffle plate 5021, thereby avoiding the risk of the second baffle plate 5022 continuing to move downward and interfering with the supporting device of the lower fixed shelf.

[0089] Specifically, the high-position limiting portion or the low-position limiting portion 5013 is a limiting rib formed on the decorative plate 501 .

[0090] In this embodiment, if Figure 18-Figure 24 As shown, the relationship and working process between the two are described by taking the second shielding plate 5022 located at the lower side of the second opening 50214 as an example. For those skilled in the art, the second shielding plate 5022 located at the upper side of the second opening 50214 has the same working principle, which will not be repeated here.

[0091] In order to further limit the sliding position of the second shielding plate 5022, the first shielding plate 5021 and the second shielding plate 5022 are respectively provided with a first limiting portion and a second limiting portion. Fig. 20 As shown, when the first shielding plate 5021 moves toward the direction close to the second shielding plate 5022, the first limiting portion cooperates with the low-position limiting portion to limit the second shielding plate 5022 to the first position; Fig.21 As shown, when the first shielding plate 5021 moves in a direction away from the second shielding plate 5022, the second limiting portion can limit the second shielding plate 5022 to the second position.

[0092] Specifically, Fig.19 As shown, the first shielding plate 5021 is provided with a sliding rib 50211 at the lower side of the second opening 50214, and the second shielding plate 5022 is provided with a sliding groove 50221 matching the sliding rib; the first limiting portion includes a limiting protrusion 50213 arranged at the upper end of the sliding rib, when the lower end surface of the second shielding plate 5022 cooperates with the low-position limiting portion 5013, the limiting protrusion 50213 cooperates with the upper end surface of the second shielding plate 5022 to limit the second shielding plate 5022 to the first position, see the details. Fig. 20 The second limiting portion includes a first stopper 50212 disposed at the lower end of the sliding rib 50211 and a second stopper 50222 disposed at the upper end of the sliding groove 50221, and the first stopper 50212 cooperates with the second stopper 50222 to limit the second shielding plate 5022 to the second position, see Fig.21 .

[0093] Figure 22-24 The structure diagram of the front and rear sides of the decorative panel 501 when the lifting shelf 103 is moved from the lowest position to the middle position to the highest position; wherein, when the lifting shelf 103 is at the lowest position, Fig. 22 As shown, the second opening 50214 is located at the lowermost side, the second shielding plate 5022 slides to the inner side of the first shielding plate 5021, the lower end surface of the second shielding plate 5022 cooperates with the low-position limiting portion 5013, and the limiting protrusion 50213 cooperates with the upper end surface of the second shielding plate 5022 to limit the second shielding plate 5022 to the first position; when the lifting shelf 103 is in the middle position, as shown in FIG. Fig.23 As shown, the second opening 50214 is located in the middle position, the first shielding plate 5021 slides relative to the second shielding plate 5022, so that the second shielding plate 5022 is located on the outside of the first shielding plate 5021, and the first stopper 50212 cooperates with the second stopper 50222 to limit the second shielding plate 5022 to the second position; when the lifting shelf 103 is at the highest position, as shown in FIG. Fig.24 As shown, the second opening 50214 is located at the highest position, and the first shielding plate 5021 drives the second shielding plate 5022 to move up to the highest position.

[0094] Specifically, two T-shaped sliding grooves 50221 are provided on the second shielding plate 5022 , and two T-shaped sliding ribs 50211 are correspondingly provided on the first shielding plate 5021 .

[0095] The structure of the present embodiment 2 is basically the same as that of the embodiment 1, except that: Figure 25-Figure 34 As shown, in this embodiment, a traction rope position adjustment device 700 for adjusting the position of the traction rope 304 and a micro switch position adjustment device 800 for adjusting the position of the micro switch 601 are added.

[0096] When the lengths of the traction ropes 304 on both sides are adjusted, it is easy to cause the shelves to be uneven on the left and right sides. Therefore, the traction rope position adjustment device 700 for adjusting the length of the traction rope 304 adopts the following structure: Fig. 27 As shown, the traction rope position adjustment device 700 includes an adjustment plate 701, and the adjustment plate 701 can slide relative to the inner wall of the storage chamber 100. A pressing member 702 is fixedly provided on the adjustment plate 701 to press against the traction rope 304. The sliding direction of the adjustment plate 701 is not parallel to the extension direction of the traction rope 304. In this way, when the left and right sides of the shelf are uneven, the traction rope 304 on the lower side of the shelf can be pulled upward by sliding the adjustment plate 701 to achieve shelf height adjustment.

[0097] Specifically, Fig.28 As shown, the pressing member 702 includes a fixed shaft 7021 fixedly connected to the adjustment plate 701, a rotating wheel 7022 rotatably connected to the fixed shaft 7021, the rotating wheel 7022 is slidably connected to the fixed shaft 7021 through a nut, and a sliding groove 70221 is formed on the wheel surface of the rotating wheel 7022 to cooperate with the traction rope 304. The sliding friction between the rotating wheel 7022 and the traction rope 304 is smaller than that between the fixed member and the traction rope 304, so as to avoid the wear of the traction rope 304; at the same time, by providing the sliding groove 70221 to cooperate with the traction rope 304, the traction rope 304 can be prevented from being separated from the pressing member 702 in the horizontal direction.

[0098] Specifically, Fig.26 and Fig.29 As shown, in order to facilitate the installation and adjustment of the adjustment plate 701, a fixed plate is fixedly installed on the rear wall of the storage chamber 100, and the adjustment plate 701 can be slidably installed on the fixed plate. A guide part and an adjustment part are provided between the fixed plate and the adjustment plate 701. The guide part is used to guide the sliding direction of the adjustment plate 701, and the adjustment part is used to adjust the sliding position of the adjustment plate 701.

[0099] Specifically, Fig.26 , Fig. 27 As shown, the adjustment part includes: an adjustment bolt 704 and a return spring 705 arranged between a fixed plate and an adjustment plate 701, the fixed plate is provided with a first threaded hole 703A, the adjustment bolt 704 is passed through the first threaded hole 703A, and its end acts on the adjustment plate 701, and the elastic force of the return spring 705 is suitable for pressing the adjustment plate 701 against the adjustment bolt 704. In this way, the position of the adjustment plate 701 can be adjusted by simply rotating the adjustment bolt 704.

[0100] More specifically, if Figure 29-Figure 31 As shown, the fixed plate includes a fixed plate body 7031, and the adjustment plate 701 slides along the fixed plate body 7031; the fixed plate also includes a first mounting plate 7032 and a second mounting plate 7033 arranged perpendicular to the plate surface of the fixed plate body 7031, and the first mounting plate 7032 is provided with the first threaded hole 703A, and the second mounting plate 7033 is provided with a positioning shaft 70331 for installing the reset spring 705.

[0101] Specifically, the structure of the guide portion is not unique. In one embodiment, it can adopt a prismatic guide rail structure that can achieve linear sliding, such as a dovetail guide rail. This type of guide rail is difficult to adjust because it is in surface contact during sliding. Therefore, in this embodiment, the guide portion preferably adopts the following structural form: Figure 29-Figure 31 As shown, the guide portion includes a guide column 706 arranged on the fixed plate and a guide groove 707 arranged on the adjustment plate 701 and cooperating with the guide column 706, so that when the adjustment bolt 704 is rotated to make the adjustment plate 701 slide, the guide column 706 cooperates with the guide groove 707, and the two are in line contact, so that the sliding of the adjustment plate 701 is smoother, which is convenient for users to adjust.

[0102] More specifically, in order to avoid unstable movement of the adjustment plate 701 caused by providing one guide portion, the guide portions are provided in an even number, such as 2 or 4, which are symmetrically arranged on both sides of the axis of the adjustment bolt 704 .

[0103] More specifically, if Fig.30 As shown, the guide column 706 includes a first shaft 7061 with a smaller diameter and a second shaft 7062 with a larger diameter; the first shaft 7061 is connected to the fixing plate; Fig.28 As shown, the guide groove 707 includes a guide section 7071 matched with the first shaft 7061 and a plug section 7072 matched with the second shaft 7062. The plug section 7072 is formed as an arc groove with an opening, the diameter of the arc groove matches the diameter of the second shaft 7062, and the width of the guide section 7071 matches the diameter of the first shaft 7061. During installation, after the second shaft 7062 of the guide column 706 is inserted from the plug section 7072 of the guide groove 707, the adjustment plate 701 is slid to the first shaft 7061 to match the guide section 7071. In this way, the adjustment plate 701 can be positioned in the horizontal direction to prevent the adjustment plate 701 from being separated from the fixing plate in the horizontal direction.

[0104] The above-mentioned traction rope position adjustment device can be set up as one, and the traction rope position adjustment device can be set at the longer end of the traction rope 304. In this way, the height of the traction rope 304 can be adjusted to the horizontal by adjusting the traction rope position adjustment device; for the convenience of adjustment, one of the above-mentioned traction rope position adjustment devices is respectively set on the traction rope 304 on both sides of the driving motor 303.

[0105] When the height of the traction rope 304 is adjusted by using the above-mentioned traction rope position adjustment device, the initial position of the micro switch detection arm 6011 mounted on the traction rope 304 will change due to the change in the position of the traction rope 304, affecting the normal response of the micro switch. Therefore, when the position of the traction rope 304 changes, the position of the micro switch 601 also needs to change accordingly.

[0106] Therefore, if Fig.25 As shown, the refrigerator of this embodiment includes a micro switch position adjustment device 800 for adjusting the installation position of the micro switch; Figure 31-32 As shown, the micro switch position adjustment device 800 includes a mounting seat 801 , the micro switch is fixedly connected to the mounting seat 801 , and the mounting seat 801 can slide along a sliding track relative to the inner wall of the storage chamber 100 .

[0107] Specifically, Fig.31As shown, the mounting seat 801 can be slidably installed on the fixing plate, and a second threaded hole 703B is provided on the fixing plate. A circular arc adjustment hole 8011 is formed on the mounting seat 801. After the position of the traction rope 304 is adjusted to the right position, the mounting seat 801 is adjusted so that the circular arc adjustment hole 8011 is opposite to the second threaded hole 703B on the fixing plate. After the detection arm 6011 is in the initial position, the mounting seat 801 is fixed to the fixing plate by screws.

[0108] In order to further improve the convenience of adjustment, the fixing plate is further provided with a third threaded hole 703C, and the mounting seat 801 is correspondingly provided with a circular mounting hole 8012 whose size matches the third threaded hole 703C. Thus, during installation and adjustment, the mounting seat 801 is first positioned on the fixing plate through the second threaded hole 703B and the third threaded hole 703C by screws (without locking connection), and after adjusting the mounting seat 801 so that the detection arm 6011 is in the initial position, the mounting seat 801 is then locked on the fixing plate by screws, and the position adjustment of the mounting seat 801 and the micro switch 601 is completed.

[0109] like Fig.33 Shown is a schematic diagram of the traction rope in an unadjusted initial state; Fig.34 This is a state diagram of the traction rope after being adjusted by the traction rope position adjustment device 700. After the traction rope position is lowered, the micro switch 601 is simultaneously changed in position by the micro switch position adjustment device 800, which can ensure the normal response of the micro switch.

[0110] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A refrigerator with a lifting shelf, characterized in that: include: A storage room, wherein a lifting shelf and a shelf driving mechanism for driving the lifting shelf to move up and down are provided in the storage room; The shelf driving mechanism comprises: guide rails respectively fixed to opposite sides of the storage chamber, supports slidably connected to the guide rails, the lifting shelf is fixedly connected to the supports; and a driving motor, a first pulley is fixed to the output shaft of the driving motor; second pulleys for converting the traction direction of the traction rope are respectively provided on the left and right sides of the storage chamber, one end of the two traction ropes is respectively fixed to the first pulley, the middle positions of the two traction ropes are respectively passed around the second pulleys located on both sides of the storage chamber, and the other ends of the traction ropes are respectively fixed to the supports; The shelf driving mechanism also includes an emergency stop device for controlling the driving motor to stop when the lifting shelf encounters resistance when ascending or descending; Also included is a traction rope position adjustment device for adjusting the position of the traction rope; The traction rope position adjustment device comprises an adjustment plate, the adjustment plate can slide relative to the inner wall of the storage chamber, the adjustment plate is provided with a pressing member pressed against the traction rope, and the sliding direction of the adjustment plate is not parallel to the extension direction of the traction rope; The pressing member comprises a fixed shaft fixedly connected to the adjusting plate, and a rotating wheel rotatably connected to the fixed shaft, wherein the rotating wheel is slidably connected to the fixed shaft through a nut, and a sliding groove cooperating with the traction rope is formed on the wheel surface of the rotating wheel; The rear wall of the storage chamber is formed with a motor installation groove, and the driving motor is arranged in the motor installation groove; The left and right side walls of the storage chamber are formed with guide rail installation grooves, and the guide rails are arranged in the guide rail installation grooves; A duct assembly is provided on the inner wall of the rear side of the storage room, and the decorative structure covering the shelf driving mechanism includes two parts, one part is a duct cover covering the driving motor and the upper half of the traction rope, and the other part is a decorative panel covering the area where the guide rail is located, and the decorative panel is located on the left and right sides of the duct cover, one end of the decorative panel is clamped in the guide rail mounting groove, and the other end is fixed to the rear wall of the storage room, and both sides of the duct cover can cover part of the panel surface of the decorative panel.

2. The refrigerator with lifting shelves according to claim 1, characterized in that: A fixed plate is fixedly installed on the rear wall of the storage chamber, and the adjustment plate is slidably installed on the fixed plate. A guide part and an adjustment part are provided between the fixed plate and the adjustment plate. The guide part is used to guide the sliding direction of the adjustment plate, and the adjustment part is used to adjust the sliding position of the adjustment plate.

3. The refrigerator with lifting shelves according to claim 2, characterized in that: The adjusting part includes: an adjusting bolt and a return spring arranged between a fixed plate and an adjusting plate, the fixed plate is provided with a first threaded hole, the adjusting bolt is passed through the first threaded hole, and an end portion of the adjusting bolt acts on the adjusting plate, and the elastic force of the return spring is suitable for pressing the adjusting plate against the adjusting bolt.

4. The refrigerator with lifting shelves according to claim 3, characterized in that: The guide part comprises a guide column arranged on the fixing plate and a guide groove arranged on the adjusting plate. The guide column is plugged into the guide groove and can slide along the extending direction of the guide groove.

5. The refrigerator with lifting shelves according to claim 4, characterized in that: The guide column includes a first shaft with a smaller diameter and a second shaft with a larger diameter; the first shaft is connected to the fixing plate; the guide groove includes a guide section matched with the first shaft and a plug-in section matched with the second shaft.

6. The refrigerator with lifting shelves according to any one of claims 1 to 5, characterized in that: A traction rope position adjustment device is respectively arranged on the traction ropes on both sides of the driving motor.

7. The refrigerator with lifting shelves according to any one of claims 2 to 5, characterized in that: It also includes a micro switch position adjustment device for adjusting the installation position of the micro switch, the micro switch position adjustment device includes a mounting seat, the micro switch is fixedly connected to the mounting seat, and the mounting seat can slide along a sliding track relative to the inner wall of the storage chamber.

8. The refrigerator with lifting shelves according to claim 7, characterized in that: The mounting seat can be slidably mounted on the fixing plate, a second threaded hole is provided on the fixing plate, an arc adjustment hole is formed on the mounting seat, and the mounting seat is fixed to the fixing plate by screws passing through the arc adjustment hole and the second threaded hole.

9. The refrigerator with lifting shelves according to claim 8, characterized in that: The fixing plate is also provided with a third threaded hole, and the mounting seat is correspondingly provided with a mounting hole matching the size of the third threaded hole. The mounting seat is fixed to the fixing plate by screws passing through the arc adjustment hole and the second threaded hole.

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