Lifting device, drawer and refrigerator

Abstract

The utility model discloses a lifting device, a drawer and a refrigerator, comprising: a lifting assembly used for bearing a lifted object, the lifting assembly comprising at least one active connecting rod; the transmission assembly comprises at least one driving transmission structure and a worm transmission structure; one end of each driving connecting rod is hinged to the lifted object, the other end of each driving connecting rod is hinged to the driving transmission structure, and the driving transmission structure is further connected with the worm transmission structure; and the driving transmission structure and the worm transmission structure are matched with each other and jointly drive the driving connecting rod and the lifted object to do lifting motion along a parabolic path. Therefore, when the lifted object descends along the parabolic path, the descending speed can be slowed down, the impact force generated in the descending process is reduced, and the service life of the lifting device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration, in particular to a lifting device, a drawer and a freezer. Background Art

[0002] Currently, household freezers generally have an upper door and a lower box structure, and the accommodation space inside the box is an integral structure. However, due to the structure of the freezer, it is difficult to take out the items stored at the bottom of the freezer. The taking-out method is complex, time-consuming and laborious. At the same time, due to the long-time opening of the door, cold loss and frosting inside the freezer occur.

[0003] To solve the above problems, some manufacturers use the grille inside the freezer box to divide the accommodation space into upper and lower layers. Then, a drawer is provided at the bottom of the outer wall of the freezer corresponding to the lower layer of the accommodation space. When it is necessary to take in or out the items at the bottom of the freezer, only need to horizontally pull out the drawer first, and then the drawer moves vertically upward through its own lifting device to achieve the purpose of opening the drawer.

[0004] However, for the lifting device adopted by the drawer provided at the bottom of the freezer, when it descends, it mostly relies on its own gravity to achieve vertical descent, resulting in a rapid descent process. The impact force generated during the descent process will damage itself or the lifting device, reducing its service life. Summary of the Utility Model

[0005] In view of this, the utility model provides a lifting device, a drawer and a freezer, which are used to solve the problem in the prior art that the drawer descends vertically through the lifting device, resulting in a rapid descent process. The impact force generated during the descent process will damage itself or the lifting device, reducing its service life.

[0006] The technical solution of the utility model is a lifting device, including:

[0007] A lifting component for carrying the object to be lifted, and the lifting component includes at least one active link;

[0008] A transmission component including at least one active transmission structure and a worm transmission structure;

[0009] One end of each active link is hinged to the object to be lifted, and the other end of each active link is respectively hinged to the active transmission structure. The active transmission structure is also connected to the worm transmission structure;

[0010] Wherein, the active transmission structure and the worm transmission structure cooperate with each other to jointly drive the active link and the object to be lifted to move up and down along a parabolic trajectory.

[0011] Further, two active transmission structures are arranged side by side in the transmission component, and the active transmission structures are both meshed with one worm transmission structure.

[0012] Further, the transmission assembly further includes a first fixing bracket; the active transmission structure includes an active rotating shaft and a three-axis connecting rod; the worm transmission structure includes a driven gear, a worm, a first gear, and a second gear; the driven gear includes a large gear, a small gear, and a gear shaft connecting the large gear and the small gear;

[0013] The top of the first fixing bracket is provided with a shaft hole corresponding to the gear shaft for installing the gear shaft; one side wall of the first fixing bracket is rotatably connected with a worm, and the worm is provided with a threaded portion corresponding to and meshing with the small gear;

[0014] The active rotating shaft passes through the middle of the driven gear and is connected to the corner of the three-axis connecting rod, and a shaft sleeve is provided between the active rotating shaft and the driven gear; one end of the three-axis connecting rod is hinged to the first gear, and the other end of the three-axis connecting rod is respectively hinged to the second gear and the other end of the active connecting rod;

[0015] And the large gear meshes with the first gear, and the first gear meshes with the second gear.

[0016] Further, both ends of the bottom of one side wall of the first fixing bracket extend outward to form fixing blocks, and the fixing blocks are respectively provided with mounting holes penetrating along the length direction of the worm, and rolling bearings are arranged in the mounting holes;

[0017] Both ends of the worm respectively pass through and are in interference connection with the corresponding rolling bearings.

[0018] Further, the worm transmission structure further includes a first driving mechanism, and the output end of the first driving mechanism is connected to one end of the worm passing through one of the rolling bearings.

[0019] Further, the active transmission structure further includes a second driving mechanism, and the output end of the second driving mechanism is connected to one end of any one of the active rotating shafts;

[0020] Each of the active rotating shafts is provided with a guide wheel, all the guide wheels are arranged side by side, and a transmission belt is sleeved on all the guide wheels.

[0021] Further, an opening is provided at the top of the shaft hole, both ends of the opening are recessed downward to form limiting grooves, and both ends of the bottom of the limiting grooves are recessed downward to form first limiting holes;

[0022] The limiting grooves are correspondingly provided with limiting blocks, and the limiting blocks are respectively provided with a second limiting hole corresponding to the first limiting hole;

[0023] Among them, the fastener can sequentially pass through the second limiting hole and the corresponding first limiting hole to tightly connect the limiting block and the limiting groove.

[0024] The present utility model further provides a drawer, which includes a drawer body and the above-mentioned lifting device;

[0025] One end of the drawer body is hinged to one end of all the active link rods.

[0026] Furthermore, the drawer further includes a driven assembly, and the driven assembly includes a second fixed bracket, a first driven link rod and a second driven link rod;

[0027] Both ends of the second fixed bracket along its length direction are respectively provided with a driven pin shaft, and each driven pin shaft is respectively hinged to one end of a first driven link rod. The other end of the first driven link rod is hinged to one end of the second driven link rod, and the other ends of all the second driven link rods are all hinged to the other end of the drawer body away from the transmission assembly.

[0028] The present utility model further provides a freezer, and the freezer includes the above-mentioned drawer.

[0029] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0030] The active transmission structure of the present utility model cooperates with the worm transmission structure to jointly drive the active link rod and the object to be lifted to move up and down along a parabolic trajectory. Moreover, when the object to be lifted moves down along the parabolic trajectory, the descending speed can be slowed down, the impact force generated during the descending process can be reduced, and the service life of the lifting device can be prolonged. Description of the Drawings

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs; the terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model; the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above description of the drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present utility model or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0032] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the attached drawings required for the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0033] Figure 1 Partial exploded view of the lifting device of the present utility model;

[0034] Figure 2 Left view of the drawer of the present utility model in the closed state;

[0035] Figure 3 Left view of the drawer of the present utility model in the open state;

[0036] Figure 4 Partial left view of the active transmission structure of the present utility model;

[0037] Figure 5 Partial left view of the worm gear transmission structure of the present utility model;

[0038] Figure 6 Structural schematic diagram of the first fixing bracket of the present utility model;

[0039] Figure 7 Structural schematic diagram of the drawer of the present utility model;

[0040] Figure 8 Exploded view of the driven assembly of the present utility model;

[0041] Figure 9 Structural schematic diagram of the freezer of the present utility model;

[0042] Figure 10 Left view of the freezer of the present utility model with the drawer opened.

[0043] Reference numerals:

[0044] 1. Drawer body; 2. Cabinet body; 3. Cabinet door; 4. Touch screen;

[0045] 10. Lifting assembly; 11. Active connecting rod;

[0046] 20. Transmission assembly; 21. First fixing bracket; 211. Shaft hole; 212. Fixed block; 213. Mounting hole; 214. Limiting groove; 215. First limiting hole; 216. Limiting block; 218. Fastener; 219. First bolt hole; 220. Arc-shaped groove;

[0047] 22. Active transmission structure; 221. Active rotating shaft; 2211. Guide wheel; 222. Three-axis connecting rod; 2221. First hinge part; 2222. Second hinge part; 2223. Third hinge part; 223. Second driving mechanism; 224. Transmission belt;

[0048] 23. Worm transmission structure; 231. Driven gear; 2311. Large gear; 2312. Small gear; 2313. Gear shaft; 232. Worm; 2321. Thread part; 233. First gear; 234. Second gear; 235. Rolling bearing; 236. First driving mechanism;

[0049] 30. Driven assembly; 31. Second fixing bracket; 311. Driven pin shaft; 312. Second bolt hole; 32. First driven connecting rod; 33. Second driven connecting rod;

[0050] 40. Protective cover; 41. Third bolt hole. Detailed implementation manners

[0051] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. Thus, a feature pointed out in this specification will be used to illustrate one feature of one embodiment of the present utility model, rather than implying that each embodiment of the present utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features may be combined together to show a possible system design, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combination is not intended to be limiting.

[0052] The principle and structure of the present utility model will be described in detail below with reference to the drawings and embodiments.

[0053] Embodiment 1

[0054] Existing manufacturers use the grille inside the freezer cabinet to divide the accommodation space of the freezer into upper and lower layers. Then, a drawer is provided at the bottom of the outer wall of the freezer corresponding to the lower layer of the accommodation space. When it is necessary to take or place items at the bottom of the freezer, one only needs to first horizontally pull out the drawer, and then the drawer moves vertically upward through its own lifting device to achieve the purpose of opening the drawer.

[0055] However, for the lifting device adopted by the drawer provided at the bottom of the freezer, its descent mostly relies on its own gravity to achieve vertical descent, resulting in a rapid descent process. The impact force generated during the descent process will cause damage to itself or the lifting device, reducing its service life. To solve this problem, refer to the attached Figure 1-2, the present utility model provides a lifting device, comprising:

[0056] A lifting assembly 10 for carrying the object to be lifted, and the lifting assembly 10 includes at least one active link 11; in this embodiment, the object to be lifted is preferably a drawer.

[0057] A transmission assembly 20, including at least one active transmission structure 22 and a worm transmission structure 23;

[0058] One end of each active link 11 is hinged to the object to be lifted, and the other end of each active link 11 is respectively hinged to the active transmission structure 22, and the active transmission structure 22 is also connected to the worm transmission structure 23;

[0059] Wherein, the active transmission structure 22 and the worm transmission structure 23 cooperate with each other to jointly drive the active link 11 and the object to be lifted to perform a lifting and lowering movement along a parabolic trajectory.

[0060] In this way, when the object to be lifted needs to be lifted or lowered, the active transmission structure 22 and the worm transmission structure 23 cooperate with each other to jointly drive the active link 11 and the object to be lifted to perform a lifting and lowering movement along a parabolic trajectory. In this way, compared with vertical descent, the object to be lifted moving along a parabolic trajectory can slow down the descent speed, reduce the impact force generated during the descent process, and extend the service life of the lifting device.

[0061] It should be noted that the lifting device is also provided with a control unit (not shown, the same throughout the text).

[0062] Wherein, to ensure that the lifting device can drive the object to be lifted to perform a lifting and lowering movement along a parabolic trajectory better and more stably, referring to the attached Figure 2 , in this embodiment, the transmission assembly 20 is provided with two active transmission structures 22 arranged side by side, and the active transmission structures 22 are both meshed with one worm transmission structure 23 as an example for illustration.

[0063] Of course, the active transmission structure 22 can also be set to one, three or more according to the actual situation, which is not limited here.

[0064] Specifically, to ensure that the lifting device can stably drive the object to be lifted to perform a lifting and lowering movement along a parabolic trajectory, referring to the attached Figure 1 , the transmission assembly 20 further includes a first fixing bracket 21; the active transmission structure 22 includes an active rotating shaft 221 and a three-axis link 222; the worm transmission structure 23 includes a driven gear 231, a worm 232, a first gear 233 and a second gear 234; the driven gear 231 includes a large gear 2311, a small gear 2312 and a gear shaft 2313 connecting the large gear 2311 and the small gear 2312;

[0065] At the top of the first fixing bracket 21, a shaft hole 211 is correspondingly provided for each of the gear shafts 2313, and the shaft hole 211 is used for installing the gear shaft 2313; on one side wall of the first fixing bracket 21, a worm 232 is rotatably connected, and the worm 232 is correspondingly provided with a threaded portion 2321 that matches and meshes with the pinion 2312;

[0066] The driving rotating shaft 221 penetrates through the middle of the driven gear 231 and is connected to the corner of the three-axis connecting rod 222, and a shaft sleeve (not shown, the same throughout the text) is provided between the driving rotating shaft 221 and the driven gear 231; one end of the three-axis connecting rod 222 is hinged to the first gear 233, and the other end of the three-axis connecting rod 222 is respectively hinged to the second gear 234 and the other end of the driving connecting rod 11;

[0067] And the large gear 2311 meshes with the first gear 233, and the first gear 233 meshes with the second gear 234.

[0068] It should be noted that a pin shaft extends vertically outward from the middle of one side wall of one end of the three-axis connecting rod 222 to form a first hinge portion 2221; pin shafts extend outward from the middle of both side walls of the other end of the three-axis connecting rod 222 to form second hinge portions 2222; a circular shaft hole is provided at the corner of the three-axis connecting rod 222 to form a third hinge portion 2223. Circular shaft holes are provided in the middle of both the first gear 233 and the second gear 234; a circular shaft hole is provided in the middle of the other end of the driving connecting rod 11, and a pin shaft extends vertically outward from the middle of one side wall of one end of the driving connecting rod 11; One end of the drawer or the drawer body 1 is provided with the transmission assembly 20 and two circular shaft holes are arranged side by side along the pulling direction of the drawer.

[0069] Therefore, the driving rotating shaft 221 passing through the driven gear 231 is also correspondingly inserted into the third hinge portion 2223 and fixedly connected to the third hinge portion 2223. The first hinge portion 2221 is correspondingly inserted into the circular shaft hole of the first gear 233 to form a hinge. One side of the second hinge portion 2222 is correspondingly inserted into the circular shaft hole of the second gear 234 to form a hinge, and the other side of the second hinge portion 2222 is correspondingly inserted into the circular shaft hole of the driving connecting rod 11 to form a hinge, and the pin shaft at one end of the driving connecting rod 11; The pin shafts of each driving connecting rod 11 are respectively inserted into one of the circular shaft holes at one end of the drawer body 1 to form a hinge.

[0070] Among them, to ensure that the worm 232 can rotate stably and smoothly, refer to the attached Figure 1 and 6, One of the rotational connection structures between the first fixed bracket 21 and the worm 232 is as follows: At both ends of the bottom of one side wall of the first fixed bracket 21, fixing blocks 212 extend outward. Through holes 213 are provided in the fixing blocks 212 along the length direction of the worm 232, and rolling bearings 235 are provided in the through holes 213;

[0071] Both ends of the worm 232 pass through and are in interference connection with the corresponding rolling bearings 235.

[0072] In this way, the worm 232 rotates through the rolling bearings 235.

[0073] Among them, to ensure that the active transmission structure 22 can operate automatically to drive the object to be lifted to move up and down automatically, referring to the attached Figure 2 and 4 , the active transmission structure 22 further includes a second driving mechanism 223, and the output end of the second driving mechanism 223 is connected to one end of any one of the active rotating shafts 221; and the second driving mechanism 223 is preferably a motor.

[0074] A guide wheel 2211 is provided in each of the active rotating shafts 221. All the guide wheels 2211 are arranged side by side, and a transmission belt 224 is sleeved on all the guide wheels 2211; the transmission belt 224 is preferably a conveyor belt.

[0075] In this way, when the control unit controls the second driving mechanism 223 to rotate clockwise, the second driving mechanism 223 drives the active rotating shaft 221 to rotate clockwise. The active rotating shaft 221 synchronously drives the other active rotating shaft 221 to rotate clockwise through the conveyor belt 224. Since the third hinge portion 2223 of the three-axis link 222 is fixedly connected to the corresponding active rotating shaft 221, the active rotating shaft 221 drives the corresponding three-axis link 222 to rotate clockwise along the driven gear 231, and the three-axis link 222 drives the corresponding active link 11 to rotate clockwise. Similarly, when the second driving mechanism 223 drives the active rotating shaft 221 to rotate counterclockwise, the active rotating shaft 221 synchronously drives the other active rotating shaft 221 to rotate counterclockwise through the conveyor belt 224. The active rotating shaft 221 drives the corresponding three-axis link 222 to rotate counterclockwise along the driven gear 231, and the three-axis link 222 drives the corresponding active link 11 to rotate counterclockwise.

[0076] Among them, to ensure that the worm transmission structure 23 can operate automatically to drive the object to be lifted to move up and down automatically, referring to the attached Figure 5 , the worm transmission structure 23 further includes a first driving mechanism 236 connected to the control unit, and the output end of the first driving mechanism 236 is connected to one end of the worm 232 passing through one of the rolling bearings 235; and the first driving mechanism 236 is preferably a motor.

[0077] In this way, the control unit controls the first driving mechanism 236 to rotate clockwise, the first driving mechanism 236 drives the worm 232 to rotate clockwise, the worm 232 then drives the driven gear 231 to rotate clockwise, the driven gear 231 then drives the first gear 233 to rotate clockwise, the first gear 233 then drives the second gear 234 to rotate clockwise, the second gear 234 then drives the corresponding active connecting rod 11 to rotate clockwise, and the worm 232 can simultaneously drive the two side-by-side driven gears 231 to rotate clockwise. Similarly, the first driving mechanism 236 drives the worm 232 to rotate counterclockwise, the worm 232 then drives the driven gear 231 to rotate counterclockwise, the driven gear 231 then drives the first gear 233 to rotate counterclockwise, the first gear 233 then drives the second gear 234 to rotate counterclockwise, the second gear 234 then drives the corresponding active connecting rod 11 to rotate counterclockwise, and the worm 232 can simultaneously drive the two side-by-side driven gears 231 to rotate counterclockwise.

[0078] In this way, the lifting device can realize automatic lifting through the first driving mechanism 236 and the second driving mechanism 223, without the need for the user to bend over or squat to pull open the lifted object, or the user still needs to bend over or squat to take the items in the lifted object after the lifted object is pulled open, thereby reducing the user's physical burden and achieving the purpose of saving time and effort.

[0079] It should be noted that when the active transmission structure 22 and the worm transmission structure 23 work simultaneously, the first drive mechanism 236 and the second drive mechanism 223 both rotate clockwise or counterclockwise; and the first gear 233 is driven by the driven gear 231, that is, the driven gear 231 drives the first gear 233 to rotate.

[0080] In order to ensure that the driven gear 231 can be replaced at any time and the stability of the driven gear 231 can be ensured, refer to the attached Figure 1 and 6 The top of the shaft hole 211 is provided with an opening, both ends of the opening are recessed downward to form a limiting groove 214, and both ends of the bottom of the limiting groove 214 are recessed downward to form a first limiting hole 215;

[0081] The limiting groove 214 is matched with a limiting block 216, and the limiting block 216 is matched with a second limiting hole (not shown, the same applies to the whole text) corresponding to the first limiting hole 215;

[0082] The fastener 218 can pass through the second limiting hole and the corresponding first limiting hole 215 in sequence to tightly connect the limiting block 216 and the limiting groove 214 .

[0083] Moreover, for better installation of the gear shaft 2313, the side of the limiting block 216 facing the first limiting hole 215 is recessed inward to form an arc-shaped groove 220. When the limiting block 216 is tightly connected to the limiting groove 214, the arc-shaped groove 220 and the shaft hole 211 cooperate to form a circular through-hole, which can match and install the gear shaft 2313, and the gear shaft 2313 can rotate within the circular through-hole.

[0084] It should be noted that the fastener 218 is preferably a bolt, and the first limiting hole 215 and the second limiting hole are both provided with internal threads corresponding to the fastener 218. Therefore, the fastener 218 can sequentially pass through the second limiting hole and the corresponding first limiting hole 215 to bolt-connect the limiting block 216 and the limiting groove 214, so as to achieve the close contact of the limiting block 216 with the limiting groove 214. Of course, to ensure that the fastener 218 will not loosen due to vibration, a lock washer can be installed on the fastener 218 to prevent the fastener 218 from loosening due to vibration; and when it is necessary to disassemble the fastener 218, only need to rotate the head of the fastener 218 with a wrench, and at this time the lock washer will be compressed and will not interfere with the disassembly process.

[0085] Embodiment 2

[0086] Referring to the attached Figure 2-3 drawings, the present utility model further provides a drawer, which includes a drawer body 1 and the above-mentioned lifting device;

[0087] One end of the drawer body 1 is hinged to one end of all the active linkages 11.

[0088] In this way, when the drawer needs to be lifted or lowered, the active transmission structure 22 and the worm transmission structure 23 cooperate with each other to drive the active linkage 11 to move, and then the active linkage 11 drives the drawer body 1 to perform a lifting and lowering motion along a parabolic trajectory. In this way, compared with vertical descent, the drawer body 1 moving along a parabolic trajectory during descent can slow down the descent speed, reduce the impact force generated during the descent process, reduce the damage caused by the impact force to the lifting device or the drawer, and extend the service life of the lifting device or the drawer.

[0089] It should be noted that when the drawer is in a fully closed state, referring to the attached Figure 2 drawings, the axes of the active rotating shaft 221 and the driven gear 231 are in the same horizontal plane, and the center line of the active linkage 11 is perpendicular to this horizontal plane; and when the drawer is in a fully open state, referring to the attached Figure 3 drawings, the axes of the active rotating shaft 221 and the driven gear 231 are still in the same horizontal plane, but at this time the center line of the active linkage 11 is also in this horizontal plane.

[0090] Among them, to ensure the stability of the drawer body 1 during the lifting and lowering motion, prevent the drawer from tipping over or falling, referring to the attached Figure 7, the drawer further includes a driven component 30 that moves synchronously with the transmission component 20. The driven component 30 includes a second fixed bracket 31, a first driven link 32, and a second driven link 33;

[0091] Both ends of the second fixed bracket 31 along its length direction are respectively provided with driven pins 311. Each driven pin 311 is respectively hinged to one end of a first driven link 32. The other end of the first driven link 32 is hinged to one end of the second driven link 33. The other ends of all the second driven links 33 are hinged to the other end of the drawer body 1 away from the transmission component 20.

[0092] Specifically, referring to the appendix Figure 8 , a circular shaft hole is provided in the middle of one end of each first driven link 32, and a pin extends perpendicularly outward from the middle of one side wall of the other end of each first driven link 32; a circular shaft hole is provided in the middle of one end of each second driven link 33, and a pin extends perpendicularly outward from the middle of one side wall of the other end of each second driven link 33. Two circular shaft holes are arranged side by side along the pulling direction of the drawer at the other end of the drawer body 1 away from the transmission component 20. And each driven pin 311 is respectively inserted into a circular shaft hole of a first driven link 32 to form a hinge, each pin of the first driven link 32 is respectively inserted into a circular shaft hole of a second driven link 33 to form a hinge, and each pin of the second driven link 33 is respectively inserted into a circular shaft hole at the other end of the drawer body 1 to form a hinge.

[0093] Embodiment 3

[0094] Referring to the appendix Figure 9-10 , the present utility model further proposes a freezer, and the above-mentioned drawer is installed at the bottom of the freezer.

[0095] Among them, a first fixed bracket 21 is installed on one inner side wall of the freezer corresponding to one end of the drawer. Specifically, a plurality of first bolt holes 219 are provided on the first fixed bracket 21, and the first fixed bracket 21 is installed on one inner side wall of the freezer by bolts passing through the corresponding first bolt holes 219; a second fixed bracket 31 is installed on the other inner side wall of the freezer corresponding to the other end of the drawer. Specifically, a plurality of second bolt holes 312 are provided on the second fixed bracket 31, and the second fixed bracket 31 is installed on the other inner side wall of the freezer by bolts passing through the corresponding second bolt holes 312.

[0096] Among them, to ensure that the lifting device is not affected by the outside, a protective cover 40 is installed on the outer surface of the lifting device in a matching manner. A plurality of third bolt holes 41 are provided at the edge of the protective cover 40, and the protective cover 40 is installed on one inner side wall of the freezer by bolts passing through the corresponding third bolt holes 41.

[0097] Among them, the freezer includes a cabinet body 2 and a cabinet door 3 that is matched and covered on the top of the cabinet body 2; and a drawer is provided at the bottom of the outer side wall of the cabinet body 2, and a touch screen 4 is also provided on the outer side wall of the cabinet door 3. The touch screen 4 is electrically connected to the control unit. Users can operate the drawer to open or close on the touch screen 4, and the touch screen 4 also has functions such as conventional display and control of the internal temperature of the freezer.

[0098] When the corresponding operation is pressed on the touch screen 4, the control unit will activate the first driving mechanism 236 and the second driving mechanism 223, and the automatic lifting of the drawer is realized through the first driving mechanism 236 and the second driving mechanism 223. Users do not need to bend down or squat down to open the drawer, or do not need to bend down or squat down to take the items in the drawer after the drawer is opened, so as to reduce the physical burden of users and achieve the purpose of saving time and effort; and the drawer moves downward along a parabolic trajectory to slow down the descending speed, reduce the impact force generated during the descending process, reduce the damage caused by the impact force to the lifting device or the drawer, and extend the service life of the lifting device or the drawer.

[0099] Among them, the principle of opening and closing the drawer of the freezer is as follows:

[0100] First, refer to the appendix Figure 3 , open the drawer:

[0101] The control unit activates the first driving mechanism 236 and the second driving mechanism 223. The second driving mechanism 223 drives the driving rotating shaft 221 to rotate counterclockwise. The driving rotating shaft 221 synchronously drives another driving rotating shaft 221 to rotate counterclockwise through the conveyor belt 224. The driving rotating shaft 221 will drive the corresponding three-axis connecting rod 222 to rotate counterclockwise along the driven gear 231. The three-axis connecting rod 222 drives the corresponding driving connecting rod 11 to rotate counterclockwise, causing the drawer to rise; at the same time, the first driving mechanism 236 drives the worm 232 to rotate counterclockwise. The worm 232 drives the driven gear 231 to rotate counterclockwise, the driven gear 231 drives the first gear 233 to rotate counterclockwise, the first gear 233 drives the second gear 234 to rotate counterclockwise, and the second gear 234 drives the corresponding driving connecting rod 11 to rotate counterclockwise, causing the drawer to be pulled outwards and rise at the same time to achieve the purpose of opening the drawer.

[0102] Second, refer to the appendix Figure 2 , close the drawer:

[0103] The control unit activates the first driving mechanism 236 and the second driving mechanism 223. The second driving mechanism 223 drives the driving rotating shaft 221 to rotate clockwise. The driving rotating shaft 221 synchronously drives another driving rotating shaft 221 to rotate clockwise through the conveyor belt 224. The driving rotating shaft 221 drives the corresponding three-axis connecting rod 222 to rotate clockwise along the driven gear 231. The three-axis connecting rod 222 drives the corresponding driving connecting rod 11 to rotate clockwise, causing the drawer to descend. At the same time, the first driving mechanism 236 drives the worm 232 to rotate clockwise. The worm 232 drives the driven gear 231 to rotate clockwise. The driven gear 231 drives the first gear 233 to rotate clockwise. The first gear 233 drives the second gear 234 to rotate clockwise. The second gear 234 drives the corresponding driving connecting rod 11 to rotate clockwise, causing the drawer to retract inward and descend simultaneously, so as to achieve the purpose of closing the drawer.

[0104] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all embodiments. The drawings show the preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structure made by using the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, is equally within the scope of the patent protection of the present invention.

Claims

1. A lifting device, characterized in that: include: A lifting assembly (10) for carrying an object to be lifted, wherein the lifting assembly (10) comprises at least one active connecting rod (11); A transmission assembly (20) comprising at least one active transmission structure (22) and a worm transmission structure (23); One end of each active connecting rod (11) is hinged to the lifted object, and the other end of each active connecting rod (11) is hinged to the active transmission structure (22), and the active transmission structure (22) is also connected to the worm transmission structure (23); The active transmission structure (22) and the worm transmission structure (23) cooperate with each other to jointly drive the active connecting rod (11) and the lifted object to perform lifting motion along a parabolic trajectory.

2. The lifting device according to claim 1, characterized in that: The transmission assembly (20) is provided with two active transmission structures (22) side by side, and each of the active transmission structures (22) is meshed with one of the worm transmission structures (23).

3. The lifting device according to claim 1 or 2, characterized in that: The transmission assembly (20) further comprises a first fixed bracket (21); the active transmission structure (22) comprises an active rotating shaft (221) and a three-axis connecting rod (222); the worm transmission structure (23) comprises a driven gear (231), a worm (232), a first gear (233) and a second gear (234); the driven gear (231) comprises a large gear (2311), a small gear (2312) and a gear shaft (2313) connecting the large gear (2311) and the small gear (2312); The top of the first fixing bracket (21) is provided with an axial hole (211) corresponding to the gear shaft (2313), and the axial hole (211) is used to install the gear shaft (2313); a worm (232) is rotatably connected to a side wall of the first fixing bracket (21), and the worm (232) is provided with a threaded portion (2321) corresponding to the pinion (2312) and matched and meshed; The driving shaft (221) passes through the middle of the driven gear (231) and is connected to the corner of the three-axis connecting rod (222), and a shaft sleeve is provided between the driving shaft (221) and the driven gear (231); one end of the three-axis connecting rod (222) is hinged to the first gear (233), and the other end of the three-axis connecting rod (222) is respectively hinged to the second gear (234) and the other end of the driving connecting rod (11); Furthermore, the large gear (2311) is meshed with the first gear (233), and the first gear (233) is meshed with the second gear (234).

4. The lifting device according to claim 3, characterized in that: Both ends of the bottom of a side wall of the first fixing bracket (21) are provided with fixing blocks (212) extending outwards, and the fixing blocks (212) are provided with mounting holes (213) penetrating along the length direction of the worm (232), and rolling bearings (235) are provided in the mounting holes (213); Both ends of the worm (232) pass through and are interference-connected with the corresponding rolling bearings (235).

5. The lifting device according to claim 4, characterized in that: The worm gear transmission structure (23) further comprises a first driving mechanism (236), wherein an output end of the first driving mechanism (236) is connected to one end of the worm (232) passing through one of the rolling bearings (235).

6. The lifting device according to claim 3, characterized in that: The active transmission structure (22) further comprises a second driving mechanism (223), wherein an output end of the second driving mechanism (223) is connected to one end of any one of the active rotating shafts (221); Each of the driving rotating shafts (221) is provided with a guide wheel (2211), all of the guide wheels (2211) are arranged side by side, and all of the guide wheels (2211) are sleeved with a transmission belt (224).

7. The lifting device according to claim 3, characterized in that: The top of the shaft hole (211) is provided with an opening, both ends of the opening are recessed downward to form a limiting groove (214), and both ends of the bottom of the limiting groove (214) are recessed downward to form a first limiting hole (215); The limiting groove (214) is matched with a limiting block (216), and the limiting block (216) is matched with a second limiting hole corresponding to the first limiting hole (215); The fastener (218) can pass through the second limiting hole and the corresponding first limiting hole (215) in sequence to tightly connect the limiting block (216) and the limiting groove (214).

8. Drawer, characterized in that, It comprises a drawer body (1) and a lifting device according to any one of claims 1 to 7; One end of the drawer body (1) is hinged to one end of all the active connecting rods (11).

9. The drawer according to claim 8, characterized in that: The drawer further comprises a driven assembly (30), wherein the driven assembly (30) comprises a second fixed bracket (31), a first driven connecting rod (32) and a second driven connecting rod (33); A driven pin shaft (311) is respectively provided at both ends of the second fixed bracket (31) along its length direction, each driven pin shaft (311) is respectively hinged to one end of one of the first driven connecting rods (32), the other end of the first driven connecting rod (32) is hinged to one end of the second driven connecting rod (33), and the other ends of all the second driven connecting rods (33) are hinged to the other end of the drawer body (1) away from the transmission assembly (20).

10. A refrigerator, characterized in that: The refrigerator comprises the drawer according to claim 8 or 9.

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