CN211695588U

CN211695588U - Automatic telescopic mechanism for household appliances

Info

Publication number: CN211695588U
Application number: CN201922361901.4U
Authority: CN
Inventors: 黄建昌; 史海坤; 邹泽
Original assignee: Oechsler Plastic Products Taicang Co Ltd
Current assignee: Oechsler Plastic Products Taicang Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-10-16
Anticipated expiration: 2029-12-25

Abstract

The utility model belongs to the domestic appliance field specifically discloses an automatic telescopic machanism for household electrical appliances, include: the device comprises a shell, a driving assembly and a telescopic assembly; one side of the shell is provided with an opening, and the orientation of the opening is recorded as the extending direction; one end of the telescopic component is fixed in the shell and is marked as a fixed end, and the other end of the telescopic component can extend out of the shell or be taken in the shell and is marked as a movable end; the driving component is fixed in the outer shell 1 and can drive the telescopic component to enable the movable end to extend out of or retract into the outer shell. The utility model discloses an automatic telescopic machanism for household electrical appliances can conveniently install in various cabinet type household electrical appliances, and compact structure is reliable, and the little flexible stroke of occupation space is big, can realize that the drawer or put the automation of thing board and stretch out and withdraw, also can compromise manually operation's portability simultaneously, still can manually open and shut under the proruption outage condition and can not block and die, but also have and prevent tong anticollision function.

Description

Automatic telescopic mechanism for household appliances

Technical Field

The utility model belongs to the domestic appliance field, more specifically say, relate to an automatic telescopic machanism for household electrical appliances.

Background

The rapid development of the household appliance industry provides wide diversified selection space for people, and the requirements of people on the aspects of convenience, safety, humanization and the like of household appliances are higher and higher. Even though the traditional household appliance has reached a higher level in terms of functionality, the traditional household appliance still has many defects in the aspects of convenience in operation, humanization and the like. Taking cabinet type household appliances such as refrigerators as an example, most of the existing refrigerator drawers or shelves are of a manual drawing type, and the taking and placing of articles are not very convenient. To solve this problem, a small number of drawers with automatic or semi-automatic pull-out function have also been proposed. However, the existing drawer generally has the problems that a large space is occupied by a telescopic mechanism, the telescopic stroke is limited by the telescopic mechanism and the like; moreover, the existing device has single operation mode and operation logic, is difficult to adapt to diversified use environments and possible emergent conditions, and even has larger potential safety hazard.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model provides an automatic telescopic machanism for household electrical appliances. This an automatic telescopic machanism for household electrical appliances can conveniently install in various cabinet type household electrical appliances, and compact structure is reliable, and the little flexible stroke of occupation space is big, can realize that the drawer or put the automation of thing board stretch out and withdraw, also can compromise manually operation's portability simultaneously, still can manually open and shut under the proruption outage condition and can not block and die, but also have and prevent tong anticollision function.

In order to achieve the purpose, the invention is realized by the following technical scheme: an automatic retracting mechanism for an appliance, comprising: the device comprises a shell, a driving assembly and a telescopic assembly; one side of the shell is provided with an opening, and the orientation of the opening is recorded as the extending direction; one end of the telescopic component is fixed in the shell and is marked as a fixed end, and the other end of the telescopic component can extend out of the shell or be taken in the shell and is marked as a movable end; the driving component is fixed in the shell and can drive the telescopic component to enable the movable end to extend out of or retract into the shell.

In general, a cabinet-type home appliance such as a refrigerator includes a fixed cabinet and a drawer slidable out of the cabinet. When in use, the automatic pulling mechanism with convenient operation is arranged between the cabinet body and the drawer. Preferably, the shell is fixed in an interlayer of a bottom plate of the cabinet body, so that the extending direction is consistent with the drawing direction of the drawer; the extension end of the telescopic assembly is fixed on the drawer, preferably on the back of the drawer panel. The working modes comprise the following steps: when the power supply is normal, the power source drives the rack to extend or retract, and drives the drawer to be automatically opened or closed; when the power is cut off, the clutch can not transmit power, the rack is separated from the power source, manual operation can be carried out, and the drawer can not be subjected to the resistance of the power source when being pulled open or closed, so that the drawer is easy and convenient to use; in addition, the power supply can be manually turned off and manually opened and closed.

Further, in the automatic telescopic mechanism for the household appliance, the telescopic assembly comprises an X-shaped scissor assembly, a fixed slide rail, a connecting block and a movable slide rail; the X-shaped shear rod assembly comprises an X-shaped shear rod unit or consists of a plurality of X-shaped shear rod units which are continuously spliced, and each shear rod unit consists of two rod pieces which are equal in length and can be rotatably connected at the middle point; the four corners of the X-shaped scissor component are provided with connecting parts, two connecting parts positioned at the fixed end are respectively marked as a first connecting part and a second connecting part, two connecting parts positioned at the movable end are respectively marked as a third connecting part and a fourth connecting part, and the first connecting part and the third connecting part are arranged in a diagonal manner; the first connecting part is connected with the fixed slide rail in a sliding manner, the fixed slide rail is fixed in the shell, and the direction of the fixed slide rail is vertical to the extending direction; the second connecting part is rotatably fixed in the shell and is positioned on the same straight line with the fixed slide rail; the connecting block is rotatably fixed on the third connecting part; the movable slide rail is connected with the fourth connecting part in a sliding way.

The telescopic component is skillfully provided with one or more X-shaped shearing rod units, has a large stroke after being extended out and occupies a small volume after being retracted; even if a plurality of X-shaped shearing rod units are arranged and connected in sequence for use, the volume after retraction is still small, and the telescopic stroke can be multiplied. In addition, because the telescopic assembly is provided with four connecting parts and adopts four-point connection, the structure is stable and reliable in operation, the problem of left-right swinging can not occur, and the problem is easy to occur in a two-point connection extending mechanism.

Further, in the automatic telescopic mechanism for household appliances, the driving assembly comprises a motor, a gear assembly, a clutch and a rack; the rack is slidably arranged in the shell, and the sliding direction of the rack is vertical to the extending direction; the motor, the gear assembly and the clutch are all fixed in the shell; when the power is on, the clutch can transmit power, and the power output by the motor is transmitted to the rack by the gear assembly and the clutch to drive the rack to slide; when the power is cut off, the clutch can not transmit power, and the sliding of the rack is independent to the rotation of the motor; the first connecting portion is rotatably connected with the rack.

The clutch is ingeniously arranged on the driving assembly, and under the normal working condition, the motor can automatically drive the rack to slide and drive the telescopic assembly to stretch out and retract. Under the proruption outage condition, the unable transmission power of clutch, flexible subassembly stretches out and withdraws and all not influenced by motor damping, therefore is lighter during manual operation. When manual operation is needed, the operation can be realized by turning off the power supply. The driving assembly converts the rotary motion of the motor into the linear sliding of the rack, and the rack rotates at a constant speed and slides linearly at a constant speed when the motor operates normally. The driving assembly is matched with the telescopic assembly, and the constant-speed linear sliding of the rack is converted into variable-speed extending or retracting of the extending assembly. When the telescopic assembly extends to the maximum stroke, the extending speed is reduced, and the operation is smoother and softer. In addition, because the stroke can be multiplied after a plurality of X-shaped shearing rod units are connected, the rack only needs short-distance sliding to complete the opening or closing of the large stroke of the drawer, so the length of the rack can be greatly shortened, the bending resistance of the rack is obviously improved, the operation is more stable and reliable, and meanwhile, the volume of the driving assembly can be greatly reduced.

Further, in the automatic telescopic mechanism for the household appliance, the gear assembly comprises a worm, a worm wheel and a straight gear; the worm is sleeved on an output shaft of the motor, and the worm wheel and the straight gear are coaxially fixed on the clutch; the worm is meshed with the worm wheel, and the straight gear is meshed with the rack; when the power is on, the clutch can transmit power, and the worm gear and the straight gear synchronously rotate; when the power is cut off, the clutch can not transmit power, and the worm wheel and the straight gear can rotate independently.

Further, in the automatic telescopic mechanism for home appliances, the X-shaped scissor assemblies are preferably formed by continuously splicing three X-shaped scissor units with the same shape and size. The shear rod assembly comprising three X-shaped shear rod units is selected, so that a larger stroke can be obtained, the structure is not too complex, and the reliability is higher.

Further, in the above automatic telescopic mechanism for home appliances, the maximum transmission torque of the clutch is 1.2N · m, and when the load exceeds the maximum torque of the clutch, the clutch slips and only the maximum torque is output. Therefore, the automatic telescopic mechanism for the household appliance can prevent the hands from being pinched after being clamped, and can also prevent the operator from being extruded or bruised when the drawer is opened. When the drawer runs and is blocked, the clutch can also slip, so that the safety in use is ensured, and meanwhile, the motor and other parts are protected to a certain extent.

In the above automatic telescopic mechanism for a household electrical appliance, the clutch is preferably an electromagnetic clutch.

Furthermore, in the automatic telescopic mechanism for the household appliance, the fixed slide rail is provided with a slide groove perpendicular to the extending direction, and the first connecting part is slidably connected with the slide groove through a pin; the movable sliding rail is provided with a sliding groove, and the fourth connecting portion and the sliding groove are connected in a sliding mode through pins.

In addition, in order to improve the automation degree and increase the convenience of operation, a control center and a control panel can be arranged for operation. The control center receives the current signal of the motor and the signal of the control panel to control the operation of the motor and the clutch. The control panel is provided with opening, closing and manual buttons which can be controlled by manual operation. The operation and control logic of the entire automatic retracting mechanism for home appliances is as follows.

When the drawer is in the fully closed state, the motor is in a static state. At the moment, if an opening button on the operation panel is manually pressed, the control center controls the motor to rotate in the forward direction, the motor rotates in the forward direction to drive the telescopic assembly to extend out until the drawer is completely opened, the control center receives a current overload signal of the motor and controls the motor to stop working, and therefore the drawer is automatically opened. If need manually pull open the drawer, can gently draw the drawer, control center detects the induced-current signal of motor, and control motor forward rotates, and until the drawer is opened completely, control center receives the electric current overload signal of motor, and control motor stop work realizes that the drawer is manually opened the effect of motor helping hand occasionally.

When the drawer is in the fully open state, the motor is in a static state. At the moment, if a closing button on the operation panel is manually pressed, the control center controls the motor to rotate reversely, the motor rotates reversely to drive the drawer to be pulled back until the drawer is completely closed, the control center receives a current overload signal and controls the motor to stop working, and therefore the automatic closing of the drawer is achieved. If the drawer needs to be manually closed, the drawer is slightly pushed, the control center receives a current signal of the motor in the reverse rotation direction, the motor is controlled to rotate in the reverse direction, and the effect of motor assistance is achieved when the drawer is manually closed.

The motor is in a starting state during the opening or closing operation of the drawer. If the drawer runs and is hindered by external force, the control center receives the overcurrent signal of the motor, the motor is controlled to stop working, and the drawer is immediately stopped at a partial opening state, so that the anti-pinch and anti-collision device has the functions of preventing pinching and preventing collision injury and is safe to use.

When the drawer is stopped at the partial opening state, the motor is in a static state. At this time, the button can be manually operated to realize full opening or full closing, and can also be manually pulled out or closed. The operation process and the stop logic at this time refer to opening in the fully closed state or closing in the fully open state, and are not described in detail.

Alternatively, the manual button may be pressed to switch to the completely manual state. At the moment, the clutch is powered off, and the drawer is not damped by the motor when being pulled open manually, so that the drawer is lighter. The condition of the sudden power failure is the same as that in the manual state, the drawer is opened or closed without being blocked by a motor, and can be manually opened or closed like a common drawer, so that the problem that the drawer is blocked and cannot be opened is avoided, and the problem that the drawer is manually opened or closed difficultly due to the damping of the motor is also avoided.

Has the advantages that: to sum up, the utility model discloses an automatic telescopic machanism for household electrical appliances can conveniently install in various cabinet type household electrical appliances, and compact structure is reliable, and occupation space is little flexible stroke big, can realize that the drawer or put the automation of thing board stretch out and withdraw, also can compromise manually operation's portability simultaneously, still can manually open and shut under the proruption outage condition can not block and die, but also has the anticollision function of preventing pressing from both sides the hand.

Drawings

Fig. 1 and 2 are schematic structural views of an automatic telescopic mechanism for household appliances according to the present invention;

fig. 3 is a schematic structural view of the telescopic assembly according to the present invention;

fig. 4 and 5 are schematic structural views of the driving assembly according to the present invention;

FIGS. 6 and 7 are schematic structural views of the refrigerator-freezer according to embodiments 3 and 4;

fig. 8 is a front view of the refrigerator according to embodiment 4;

FIG. 9 is a schematic structural view of an automatic partition plate elevating apparatus according to embodiment 4;

fig. 10 is a schematic structural view of a power module according to embodiment 4.

In the figure, a housing 1, a driving assembly 2, a telescopic assembly 3, a motor 21, a gear assembly 22, a clutch 23, a rack 24, a worm 221, a worm wheel 222, a spur gear 223, an X-shaped scissor assembly 31, a fixed slide rail 32, a connecting block 33, a movable slide rail 34, a first connecting portion 311, a second connecting portion 312, a third connecting portion 313, a fourth connecting portion 314, a guide rail 91, a slider 92, a partition plate 93, a power assembly 94, a housing 941, a lifting motor 942, a power scroll 943, a reduction gear 944 and a lifting rack 945 are illustrated.

Detailed Description

The invention is further explained by combining the attached drawings and the specific embodiments.

Example 1

An automatic retracting mechanism for home appliances, as shown in fig. 1 to 5, comprising: the device comprises a shell 1, a driving assembly 2 and a telescopic assembly 3; one side of the shell 1 is open, and the orientation of the opening is recorded as the extending direction; one end of the telescopic component 3 is fixed in the shell 1 and is marked as a fixed end, and the other end of the telescopic component can extend out of the shell 1 or be retracted into the shell 1 and is marked as a movable end; the driving component 2 is fixed in the shell 1, and the driving component 2 can drive the telescopic component 3 to extend or retract the movable end of the telescopic component from the shell 1.

In this embodiment, the telescopic assembly 3 includes an X-shaped scissor assembly 31, a fixed slide rail 32, a connecting block 33 and a movable slide rail 34; the X-shaped scissor assembly 31 comprises an X-shaped scissor unit or is formed by continuously splicing a plurality of X-shaped scissor units, and each scissor unit comprises two rods which are equal in length and can be rotatably connected at the middle point; the four corners of the X-shaped scissor assembly 31 are provided with connecting parts, two connecting parts at the fixed end are respectively marked as a first connecting part 311 and a second connecting part 312, two connecting parts at the movable end are respectively marked as a third connecting part 313 and a fourth connecting part 314, and the first connecting part 311 and the third connecting part 313 are arranged diagonally; the first connecting portion 311 is slidably connected to the fixed slide rail 32, the fixed slide rail 32 is fixed in the housing 1, and the direction of the fixed slide rail 32 is perpendicular to the extending direction; the second connecting part 312 is rotatably fixed in the housing 1, and the second connecting part 312 and the fixed slide rail 32 are on the same straight line; the connecting block 33 is rotatably fixed on the third connecting portion 313; the movable slide rail 34 is slidably connected to the fourth connecting portion 314.

In this embodiment, the driving assembly 2 includes a motor 21, a gear assembly 22, a clutch 23, and a rack 24; the rack 24 is slidably arranged in the shell 1, and the sliding direction of the rack 24 is vertical to the extending direction; the motor 21, the gear assembly 22 and the clutch 23 are all fixed in the shell 1; when the power is on, the clutch 23 can transmit power, and the power output by the motor 21 is transmitted to the rack 24 through the gear assembly 22 and the clutch 23 to drive the rack 24 to slide; when the power is cut off, the clutch 23 can not transmit power, and the sliding of the rack 24 and the rotation of the motor 21 are mutually independent; the first coupling portion 311 is rotatably coupled with the rack gear 24.

In this embodiment, the gear assembly 22 includes a worm 221, a worm wheel 222, and a spur gear 223; the worm 221 is sleeved on the output shaft of the motor 21, and the worm wheel 222 and the straight gear 223 are coaxially fixed on the clutch 23; the worm 221 is meshed with the worm wheel 222, and the straight gear 223 is meshed with the rack 24; when the power is on, the clutch 23 can transmit power, and the worm wheel 222 and the straight gear 223 synchronously rotate; when the power is cut off, the clutch 23 can not transmit power, and the worm wheel 222 and the straight gear 223 can independently rotate.

Example 2

In this embodiment, the X-shaped scissor assembly 31 is formed by continuously splicing three X-shaped scissor units with the same shape and size.

In the present embodiment, the maximum transmission torque of the clutch 23 is 1.2N · m, and when the load exceeds the maximum torque of the clutch 23, the clutch 23 slips and outputs only the maximum torque.

In the present embodiment, the clutch 23 is an electromagnetic clutch.

In this embodiment, the fixed slide rail 32 is provided with a slide groove perpendicular to the extending direction, and the first connecting portion 311 and the slide groove are slidably connected by a pin; the movable slide rail 34 is provided with a slide groove, and the fourth connecting portion 314 and the slide groove are slidably connected through a pin.

Example 3

A refrigerator and freezer cabinet is disclosed, as shown in fig. 6 and 7, comprising a cabinet body and a drawer capable of being drawn out relative to the cabinet, wherein the cabinet body and the drawer are connected through a set of slide rails. The drawer is composed of a bottom plate, side plates and a panel, and for convenience of expression, only the panel is shown in the schematic diagram, and the bottom plate and the side plates are not shown. The shell 1 of the automatic telescopic mechanism for the household appliances is fixed in an interlayer at the bottom of the cabinet body, the extending direction is consistent with the pulling direction of the drawer, and the connecting block 33 and the movable sliding rail 34 are both fixed with the inner side of the drawer panel. As shown in fig. 1 to 5, the automatic retracting mechanism for a home appliance includes: the device comprises a shell 1, a driving assembly 2 and a telescopic assembly 3; one side of the shell 1 is open, and the orientation of the opening is recorded as the extending direction; one end of the telescopic component 3 is fixed in the shell 1 and is marked as a fixed end, and the other end of the telescopic component can extend out of the shell 1 or be retracted into the shell 1 and is marked as a movable end; the driving component 2 is fixed in the shell 1, and the driving component 2 can drive the telescopic component 3 to extend or retract the movable end of the telescopic component from the shell 1.

In the present embodiment, the clutch 23 is an electromagnetic clutch.

In addition, in order to improve the degree of automation and increase the convenience of operation, the refrigerator freezer is further provided with a control center and an operation panel. The control center receives a current signal of the motor 21 and a signal of the control panel to control the operation of the motor 21 and the clutch 23. The control panel is provided with opening, closing and manual buttons which can be controlled by manual operation. The refrigerator freezer has the following operation and control logic.

When the drawer is in the fully closed state, the motor 21 is in a stationary state. At this moment, if an opening button on the operation panel is manually pressed, the control center controls the motor 21 to rotate forward to enable the extending direction of the drawer to be recorded as the forward rotating direction, the retracting direction of the drawer to be recorded as the reverse rotating direction, the motor 21 rotates forward to drive the telescopic assembly 3 to extend until the drawer is completely opened, the control center receives a current overload signal of the motor 21 and controls the motor 21 to stop working, and thus the automatic opening of the drawer is realized. If need manually pull open the drawer, can slightly pull the drawer, control center detects motor 21's induced-current signal, and control motor 21 forward rotates, and until the drawer is opened completely, control center receives motor 21's electric current overload signal, and control motor 21 stop work realizes the manual effect of motor 21 helping hand occasionally of opening of drawer.

When the drawer is in the fully open state, the motor 21 is in a stationary state. At the moment, if a closing button on the operation panel is manually pressed, the control center controls the motor 21 to rotate reversely, the motor 21 rotates reversely to drive the drawer to be pulled back until the drawer is completely closed, the control center receives a current overload signal and controls the motor 21 to stop working, and therefore the automatic closing of the drawer is achieved. If the drawer needs to be manually closed, the drawer is slightly pushed, the control center receives a current signal of the motor 21 in the reverse rotation direction, the motor 21 is controlled to rotate in the reverse direction, and the effect that the motor 21 assists power when the drawer is manually closed is achieved.

During the opening or closing operation of the drawer, the motor 21 is in an activated state. If the drawer runs and is hindered by external force, the control center receives the overcurrent signal of the motor 21, the motor 21 is controlled to stop working, and the drawer is immediately stopped in a partially opened state, so that the anti-pinch and anti-collision device has the functions of preventing hand pinching and preventing collision injury and is safe to use.

When the drawer is stopped in the partially opened state, the motor 21 is in a stationary state. At this time, the button can be manually operated to realize full opening or full closing, and can also be manually pulled out or closed. The operation process and the stop logic at this time refer to opening in the fully closed state or closing in the fully open state, and are not described in detail.

Alternatively, the manual button may be pressed to switch to the completely manual state. At the moment, the motor 23 is powered off, and the drawer is not damped by the motor 21 when being pulled open manually, so that the drawer is lighter. The condition of sudden power failure is the same as that in the manual state, the drawer can be opened or closed manually like a common drawer because the drawer is not blocked by the motor 21, the problem that the drawer is blocked and cannot be opened is avoided, and the problem that the drawer is opened or closed manually because of the damping of the motor 21 is avoided.

Example 4

A refrigerator, as shown in FIG. 8, includes an upper freezer, a middle fresh food cabinet, and a lower freezer.

In this example, the freezer is the same as the refrigerator freezer of example 3.

In this embodiment, the refrigerator is provided with an automatic partition lifting device. As shown in fig. 9 and 10, the automatic partition lifting device includes: a lifting guide rail 91, a slide block 92, a partition plate 93 and a power assembly 94; the power assembly includes a housing 941, a lift motor 942, a power scroll 943, a reduction gear 944, a lift rack 945, and a limit switch 946. Four lifting guide rails 91 are vertically fixed on the inner wall of the refrigerated cabinet, a sliding block 92 is arranged on each lifting guide rail 91 in a sliding mode, the height of each sliding block 92 is consistent by adjusting the position of the corresponding sliding block 92, a partition plate 93 is horizontally arranged, four corners of each partition plate 93 are fixed with the corresponding sliding block 92, and the partition plates 93 can slide up and down along the lifting guide rails 91. The lifting rack 945 is vertically slidably disposed in the housing 941, the lifting motor 942, the reduction gear 944 and the limit switch 946 are disposed in the housing 941, the power scroll 943 is fixed to an output shaft of the lifting motor 942, and a driving force of the power scroll 943 is transmitted to the lifting rack 945 through the reduction gear 944 to drive the lifting rack 945 to slide up and down relative to the housing 941. Two groups of power assemblies 94 are arranged, the opposite angles of the power assemblies are fixed on the inner wall of the refrigerated cabinet, and the upper end of the lifting rack 945 is fixed with the partition plate 93.

Wherein, the lifting guide rail 91 has the functions of unbalance loading resistance and guiding; the lifting motor 942 is a band-type self-locking micro-motor with power failure self-locking function, and the partition plate 93 cannot be lifted manually due to self-locking of the lifting motor 942 and amplification of the power worm 943 and the reduction gear 944, so that the self-locking function is realized. When the partition board needs to move up and down, a button on the inner wall of the refrigerated cabinet can be manually pressed to control the lifting motor 942 to rotate synchronously, the lifting motor 942 is powered off after the button is released, and the partition board 93 stops moving; when the partition 93 moves to the highest or lowest stroke, the limit switch 946 is triggered, the lift motor 942 is de-energized, and the partition 93 stops moving.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an automatic telescopic machanism for household electrical appliances which characterized in that: the method comprises the following steps: the device comprises a shell (1), a driving assembly (2) and a telescopic assembly (3); one side of the shell (1) is provided with an opening, and the orientation of the opening is recorded as a stretching direction; one end of the telescopic component (3) is fixed in the shell (1) and is marked as a fixed end, and the other end of the telescopic component can extend out of the shell (1) or be collected in the shell (1) and is marked as a movable end; the driving component (2) is fixed in the shell (1), and the driving component (2) can drive the telescopic component (3) to enable the movable end to extend out of or retract into the shell (1).

2. The automatic retracting mechanism for an electric home appliance according to claim 1, wherein: the telescopic assembly (3) comprises an X-shaped scissor assembly (31), a fixed slide rail (32), a connecting block (33) and a movable slide rail (34); the X-shaped shear rod assembly (31) comprises an X-shaped shear rod unit or is formed by continuously splicing a plurality of X-shaped shear rod units, and each shear rod unit is formed by two rod pieces which are equal in length and can be rotatably connected at the middle point; the four corners of the X-shaped scissor component (31) are provided with connecting parts, two connecting parts at the fixed end are respectively marked as a first connecting part (311) and a second connecting part (312), two connecting parts at the movable end are respectively marked as a third connecting part (313) and a fourth connecting part (314), and the first connecting part (311) and the third connecting part (313) are arranged diagonally; the first connecting part (311) is connected with the fixed slide rail (32) in a sliding manner, the fixed slide rail (32) is fixed in the shell (1), and the direction of the fixed slide rail (32) is vertical to the extending direction; the second connecting part (312) is rotatably fixed in the shell (1), and the second connecting part (312) and the fixed slide rail (32) are on the same straight line; the connecting block (33) is rotatably fixed on the third connecting part (313); the movable slide rail (34) is connected with the fourth connecting part (314) in a sliding way.

3. The automatic retracting mechanism for an electric home appliance according to claim 2, wherein: the driving assembly (2) comprises a motor (21), a gear assembly (22), a clutch (23) and a rack (24); the rack (24) is slidably arranged in the shell (1), and the sliding direction of the rack (24) is vertical to the extending direction; the motor (21), the gear assembly (22) and the clutch (23) are all fixed in the shell (1); when the power is supplied, the clutch (23) can transmit power, and the power output by the motor (21) is transmitted to the rack (24) by the gear assembly (22) and the clutch (23) to drive the rack (24) to slide; when the power is cut off, the clutch (23) can not transmit power, and the sliding of the rack (24) and the rotation of the motor (21) are mutually independent; the first connecting portion (311) is rotatably connected to the rack (24).

4. The automatic retracting mechanism for an electric home appliance according to claim 3, wherein: the gear assembly (22) comprises a worm (221), a worm wheel (222) and a spur gear (223); the worm (221) is sleeved on an output shaft of the motor (21), and the worm wheel (222) and the straight gear (223) are coaxially fixed on the clutch (23); the worm (221) is meshed with the worm wheel (222), and the straight gear (223) is meshed with the rack (24); when the power is on, the clutch (23) can transmit power, and the worm wheel (222) and the straight gear (223) synchronously rotate; when the power is cut off, the clutch (23) can not transmit power, and the worm wheel (222) and the straight gear (223) can rotate independently.

5. The automatic retracting mechanism for an electric home appliance according to claim 3, wherein: the X-shaped shear rod assembly (31) is formed by continuously splicing three X-shaped shear rod units with the same shape and size.

6. The automatic retracting mechanism for an electric home appliance according to claim 3, wherein: the maximum transmission torque of the clutch (23) is 1.2 N.m, and when the load exceeds the maximum torque of the clutch (23), the clutch (23) slips and only the maximum torque is output.

7. The automatic retracting mechanism for an electric home appliance according to claim 6, wherein: the clutch (23) is an electromagnetic clutch.

8. The automatic retracting mechanism for an electric home appliance according to claim 3, wherein: a sliding groove perpendicular to the extending direction is formed in the fixed sliding rail (32), and the first connecting portion (311) is connected with the sliding groove in a sliding mode through a pin; the movable sliding rail (34) is provided with a sliding groove, and the fourth connecting portion (314) is connected with the sliding groove in a sliding mode through a pin.