CN113017452A

CN113017452A - Detachable handle for pot

Info

Publication number: CN113017452A
Application number: CN202110392696.7A
Authority: CN
Inventors: 罗欣; 方成
Original assignee: Zhejiang Sanhe Kitchenware Co ltd
Current assignee: Zhejiang Sanhe Kitchenware Co ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2021-06-25

Abstract

A detachable handle for a pot comprises a handle body, wherein a movable plate is arranged in the handle body, and a clamping piece is arranged at the front end of the movable plate; the handle body is also provided with a first elastic device acting on the moving plate, a driving mechanism for driving the moving plate to move backwards, a moving plate positioning mechanism for positioning the moving plate, and a positioning release mechanism for releasing the positioning of the moving plate positioning mechanism on the moving plate; the driving mechanism comprises a poking piece and a handle; the moving plate positioning mechanism comprises an upper rack, a positioning arm and a lower rack; the positioning release mechanism comprises a button and a third elastic device; the handle body is also provided with a safety mechanism. The invention has the beneficial effects that: the shifting piece is driven by the handle to rotate to move the moving plate, the shifting piece rotates to have a lever effect, the stroke of the moving plate can be lengthened, and meanwhile, the positioning structure provided with the upper rack and the lower rack can also ensure the positioning of the moving plate in a larger stroke, so that the moving plate has larger moving distance and stronger adaptability, and a pot body with a larger wall thickness range can be used.

Description

Detachable handle for pot

Technical Field

The invention relates to a detachable handle for a pot.

Background

The pan such as a frying pan is provided with a handle which is fixed on the edge of the pan, and dirt and bacteria are easy to be hidden in the gap between the pan and the handle. Therefore, the handle which can be detached from the pot body is also arranged, the handle is clamped on the pot body when the handle is needed, the handle can be conveniently detached when the handle is not needed, and the problems that dirt is easily stored and contained and bacteria are bred between the handle and the pot body are avoided.

For example, the Chinese invention patent CN 203424846U, CN 211022334U and the like all provide the detachable handle, the working principle of the detachable handle is that the driven part moves by the inclined surface matching between the driving part and the driven part, the driven part is provided with a clamping piece, the movement of the driven part enables an interlayer between the clamping piece and the front end of the handle to be enlarged or reduced, and when the handle is needed, the pot body is clamped in the interlayer and the interlayer is reduced, so that the pot body is clamped in the interlayer; when the handle is not needed, the interlayer is enlarged, so that the handle can be conveniently taken down. The prior detachable handle for a pan also has the following disadvantages: the driven part is driven by the matching of the inclined planes, the space in the handle is limited, and a long inclined plane cannot be arranged, so that the moving distance of the driven part is limited, the size change of the interlayer is small, and the pot cannot be well adapted to various pot bodies with different wall thicknesses.

Disclosure of Invention

In order to overcome the defects of the existing detachable handle for the pan, the invention provides a detachable handle for the pan, which has better adaptability.

The technical scheme for solving the technical problem is as follows: a detachable handle for a pot comprises a handle body, wherein a movable plate capable of moving back and forth along the handle body is arranged in the handle body, the front end of the movable plate penetrates through the handle body, a clamping piece is arranged at the front end of the movable plate, and an interlayer is formed between the clamping piece and the front end face of the handle body;

the handle body is also provided with a first elastic device acting on the moving plate, and under the action of the first elastic device, the moving plate has the tendency of moving forwards, so that the interlayer is wider;

the handle body is also provided with a driving mechanism for driving the moving plate to move backwards, and the driving mechanism drives the moving plate to move backwards to narrow the interlayer;

the handle body is also provided with a moving plate positioning mechanism which can position the moving plate;

the handle body is also provided with a positioning release mechanism which can release the positioning of the moving plate positioning mechanism on the moving plate so that the moving plate moves forwards under the action of the first elastic device;

the driving mechanism comprises a shifting piece and a handle connected to the lower side of the handle body, the front part of the handle is rotatably connected to the handle body, the rear part of the handle is movably connected with the lower part of the shifting piece, the middle part of the shifting piece is rotatably connected to the handle body, and the upper part of the shifting piece is movably connected with the rear part of the moving plate;

the handle body is held by hand, after the handle is held, the handle rotates so that the rear part of the handle drives the stirring piece to rotate, and the upper part of the stirring piece stirs the moving plate to move backwards after the stirring piece rotates;

the movable plate positioning mechanism comprises an upper rack arranged on the movable plate and a positioning arm positioned below the movable plate, a lower rack matched with the upper rack is arranged on the positioning arm, the rear part of the positioning arm is rotatably connected to the handle body, the front part of the positioning arm is connected with the handle body through a second elastic device, and the positioning arm has a tendency of jacking under the action of the second elastic device, so that the upper rack and the lower rack are kept meshed;

the teeth on the upper rack and the lower rack are helical teeth, and when the helical teeth on the upper rack are meshed with the helical teeth on the lower rack, the movable plate can only move backwards and can not move forwards, so that the movable plate is positioned;

the positioning release mechanism comprises a button arranged on the handle body, a third elastic device acting on the button is arranged between the handle body and the button, the third elastic device enables the button to have a tendency of bouncing upwards, the button acts on the lower rack after being pressed downwards, the lower rack and the upper rack are separated after the lower rack rotates, and the positioning of the moving plate is released; after the button is released, the button is lifted back and reset under the action of the third elastic device;

the handle body is also provided with a safety mechanism, the safety mechanism is used for blocking the button from being pressed downwards, and the button can be pressed downwards after the safety mechanism releases the blocking of the button.

Furthermore, the handle body is also provided with a button seat, the button is sleeved in the button seat, and the button seat limits the button so that the button can only move up and down but not rotate;

the safety mechanism comprises a knob, the button is also sleeved in the knob, the knob can rotate to a locking position and an unlocking position, the knob is also connected with a reset mechanism, and the reset mechanism enables the knob to have the tendency of rotating to the locking position;

a knob moving plate positioning mechanism is further arranged between the knob and the button, and when the knob is in a locking position under the action of the reset mechanism, the button is blocked by the knob so as not to be pressed down; when the knob is rotated to the unlocking position, the knob is positioned by the knob moving plate positioning mechanism and is kept at the unlocking position, the knob does not block the button at the moment, so that the button can be pressed down, and the knob is still approximately positioned at the unlocking position under the positioning of the knob moving plate positioning mechanism after the button is pressed down; when the button is lifted back, the knob moving plate positioning mechanism does not position the knob any more, and the knob automatically returns to the locking position under the action of the reset mechanism.

Furthermore, the reset mechanism is a torsion spring, one end of the torsion spring is connected to the knob, and the other end of the torsion spring is connected to the button seat.

Furthermore, a stop block protruding inwards in the radial direction is arranged in the knob, and a positioning block corresponding to the stop block is arranged on the button;

when the knob is rotated to the locking position, the positioning block of the button is positioned above the stop block, so that the positioning block is blocked by the stop block; when the knob is rotated to the unlocking position, the stop block does not block the positioning block any more.

Further, the knob moving plate positioning mechanism comprises a clamping groove arranged in the knob and a clamping block arranged on the button, and when the knob rotates to the unlocking position, the clamping block is clamped in the clamping groove so as to position the knob;

the knob moving plate positioning mechanism further comprises the stop block and a positioning block, the stop block is separated from the clamping groove after the button is pressed down, and the side face of the stop block is abutted against the side face of the positioning block, so that the knob is positioned and still approximately positioned at the unlocking position.

Furthermore, a loop is arranged in the knob, the clamping groove is arranged on the loop, and the clamping block is abutted against the loop under the action force of the third elastic device.

Furthermore, the ring channel is provided with a groove wall to form the clamping groove between the groove walls, and the groove wall facing the clamping block is provided with a first inclined surface, so that the groove wall can smoothly pass over the clamping block and then the clamping block is clamped into the clamping groove.

Furthermore, a second inclined plane matched with the first inclined plane is arranged on the clamping block.

Furthermore, the button is provided with a rotation stopping block, the side wall of the button seat is provided with a rotation stopping groove, and the rotation stopping block is positioned in the rotation stopping groove.

Further, a handle rotating shaft is arranged on the handle body, and the front part of the handle penetrates through the handle rotating shaft;

the lower part of the poking piece is provided with a through hole, the rear part of the handle is provided with a linkage shaft, and the linkage shaft penetrates into the through hole and is provided with a movable space;

the middle part of the stirring piece is rotatably connected to the handle body through a stirring rotating shaft, a shifting fork is arranged on the upper part of the stirring piece, a stirring hole is formed in the rear part of the moving plate, and the shifting fork extends into the stirring hole.

Further, the handle in be equipped with the spring fixed block, the spring fixed block be located the place ahead at movable plate rear portion, first resilient means be first extension spring, the front end hook of first extension spring be in the spring fixed block on, the rear end hook of first extension spring is in the rear portion of movable plate.

Furthermore, the second elastic device is a second tension spring, the front end of the second tension spring is hooked on the handle body, the rear end of the second tension spring is hooked on the front portion of the positioning arm, and the front end of the second tension spring is higher than the rear end of the second tension spring, so that the inclined second tension spring pulls the positioning arm to push up.

Furthermore, the lower rack is provided with a convex block protruding upwards, and the convex block upwards penetrates through the upper rack and corresponds to the button.

The invention has the beneficial effects that: the shifting piece is driven by the handle to rotate to move the moving plate, the shifting piece rotates to have a lever effect, the stroke of the moving plate can be lengthened, and meanwhile, the positioning structure provided with the upper rack and the lower rack can also ensure the positioning of the moving plate in a larger stroke, so that the moving plate has larger moving distance and stronger adaptability, and a pot body with a larger wall thickness range can be used.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention with the interlayer larger.

Figure 2 is a schematic of the structure of the present invention with a smaller interlayer.

Fig. 3 is a schematic view showing the state of the inside of the grip body when the interlayer is large.

Fig. 4 is a schematic view showing another angle state inside the grip body when the interlayer is large.

Fig. 5 is a schematic view of a state between the push button and the lower rack when the interlayer is large.

Fig. 6 is a schematic view showing the state of the inside of the grip body when the interlayer is small.

Fig. 7 is an exploded view of the installation of the shank and button.

Fig. 8 is an exploded view of the button, knob, button holder.

Fig. 9 is a schematic structural view of the button holder.

Fig. 10 is a schematic view of the structure of the button.

FIG. 11 is a rear schematic view of the knob.

Fig. 12 is a rear view of the knob with torsion springs inside.

Fig. 13 is a schematic front view of the knob and button in the locked state.

FIG. 14 is a rear schematic view of the knob and button in the locked condition.

Fig. 15 is a front schematic view of the knob and button in the unlocked state.

Fig. 16 is a rear schematic view of the knob and button in the unlocked state.

FIG. 17 is a cross-sectional view of the knob and button in the unlocked state.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-17, a handle detachably connected to a pot comprises a handle body 1, a moving plate 2 capable of moving back and forth along the handle body 1 is arranged in the handle body 1, the front end of the moving plate 2 penetrates through the handle body 1, a clamping piece 3 is arranged at the front end of the moving plate 2, and an interlayer 4 is formed between the clamping piece 3 and the front end face of the handle body 1.

The handle body 1 is also provided with a first elastic device acting on the moving plate 2, and under the action of the first elastic device, the moving plate 2 has the tendency of moving forwards, so that the interlayer 4 is wider, and the handle can be easily taken down from the pot body. In this embodiment, the first elastic device is a first tension spring 5, a spring fixing block 6 is arranged in the handle body 1, the spring fixing block 6 is located in front of the rear portion of the moving plate, the front end of the first tension spring 5 is hooked on the spring fixing block 6, and the rear end of the first tension spring 5 is hooked on the rear portion of the moving plate 2, so that the moving plate 2 tends to move forward.

The handle body 1 is also provided with a driving mechanism for driving the moving plate 2 to move backwards, and the driving mechanism drives the moving plate 2 to move backwards to narrow the interlayer 4, so that the pot body can be clamped in the interlayer 4. The specific structure mode of the driving mechanism can be as follows: the driving mechanism comprises a toggle piece 9 and a handle 7 connected to the lower side of the handle body 1, the front part of the handle 7 is rotatably connected to the handle body 1, in the embodiment, a handle rotating shaft 8 is arranged on the handle body 1, the front part of the handle 7 is arranged on the handle rotating shaft 8 in a penetrating manner, and the rotary connection of the front part of the handle can be realized by adopting other modes, for example, pins are arranged on two sides of the front part of the handle, and the pins penetrate into the handle body and the like. The rear part of the handle 7 is movably connected with the lower part of the stirring part 9, the lower part of the stirring part 9 is provided with a through hole 10, the rear part of the handle is provided with a linkage shaft 11, and the linkage shaft 11 penetrates into the through hole 10 and has a movable space. The middle part of the toggle member 9 is rotatably connected to the handle body 1, and in this embodiment, the middle part of the toggle member 9 is rotatably connected to the handle body 1 through a toggle rotating shaft 12. The upper part of the shifting part 9 is movably connected with the rear part of the moving plate 2, in this embodiment, the upper part of the shifting part 9 is provided with a shifting fork 13, the rear part of the moving plate 2 is provided with a shifting hole 14, and the shifting fork 13 extends into the shifting hole 14, although other movable connection modes can be adopted, such as the upper part of the shifting part is provided with a pin, the moving plate is provided with a pin hole, and the pin penetrates into the pin hole; or a tooth hole can be arranged on the moving plate, and the shifting piece is made into a tooth shape to form gear and rack meshing transmission and the like.

When in operation, the handle body 1 is held by hand, and after the handle 7 is pinched, the handle 7 rotates, so that the rear part of the handle 7 drives the stirring piece 9 to rotate, and the upper part of the stirring piece 9 stirs the moving plate 2 to move backwards after the stirring piece 9 rotates, so that the interlayer 4 becomes smaller.

The handle body 1 is further provided with a moving plate positioning mechanism, the moving plate positioning mechanism can position the moving plate 2, and when the pot body is clamped in the interlayer 4, the moving plate positioning mechanism is required to position the moving plate 2, so that the handle is prevented from being loosened.

In this embodiment, the positioning structure includes an upper rack 15 disposed on the moving plate 2, and a positioning arm 16 located below the moving plate 3, a lower rack 17 engaged with the upper rack 15 is disposed on the positioning arm 16, a rear portion of the positioning arm 16 is rotatably connected to the handle body 1 through a positioning arm rotation 18, a front portion of the positioning arm 16 is connected to the handle body 1 through a second elastic device, and the positioning arm 16 has a tendency of being pushed up under the action of the second elastic device, so that the upper rack 15 and the lower rack 17 are kept engaged with each other. The teeth on the upper rack 15 and the lower rack 17 are oblique teeth, and when the oblique teeth on the upper rack 15 are meshed with the oblique teeth on the lower rack 17, the moving plate 2 can only move backwards and can not move forwards, so that the moving plate 2 is positioned, specifically, the teeth on the upper rack 15 incline forwards, and the teeth on the lower rack 17 incline backwards. In this embodiment, the second elastic device is a second tension spring 19, the front end of the second tension spring 19 is hooked on the handle body 1, the rear end of the second tension spring 19 is hooked on the front portion of the positioning arm 16, and the front end of the second tension spring 19 is higher than the rear end of the second tension spring 19, so that the inclined second tension spring 19 pulls the positioning arm 16 to push up. Of course, the second elastic device may also adopt other manners, for example, the second elastic device adopts a compression spring, the compression spring is located below the front portion of the positioning arm, and the upper end of the compression spring abuts against the positioning arm, so that the second elastic device has a tendency of upward ejection.

The handle body is further provided with a positioning release mechanism, the positioning release mechanism can release the positioning of the moving plate positioning mechanism on the moving plate 2, so that the moving plate 2 moves forwards under the action of the first elastic device, and the interlayer 4 automatically enlarges after the positioning release mechanism releases the positioning of the moving plate positioning mechanism on the moving plate 2, so that the handle can be taken down from the pot body.

In this embodiment, the positioning release mechanism includes a button 20 disposed on the handle body 1, a button seat 21 is fixed on the handle body 1, the button 20 is sleeved in the button seat 21, the button seat 21 limits the button 20, so that the button 20 can only move up and down but not rotate, and the specific implementation manner may be: the button 20 is provided with a rotation stopping block 22, the side wall of the button seat 21 is provided with a rotation stopping groove 23, the rotation stopping block 22 is positioned in the rotation stopping groove 23, and the rotation stopping block 22 and the rotation stopping groove 23 are matched with each other to limit the action of the button 20, so that the button 20 can only move up and down but not rotate, and meanwhile, the up-and-down movement of the button 20 is guided, and the button 20 is more smoothly pressed. A third elastic device acting on the button 20 is arranged between the handle body 1 and the button 20, the third elastic device makes the button 20 have a tendency of springing up, in the embodiment, the third elastic device adopts a compression spring 24, and the compression spring 24 is pressed against the button. The button 20 acts on the lower rack 17 after being pressed down, so that the lower rack 17 is separated from the upper rack 18 after the lower rack 17 rotates, and the movable plate 2 is released from being positioned; after the button 20 is released, the button 20 is lifted back and reset under the action of the compression spring 24. In this embodiment, the lower rack 17 is provided with a protruding block 25 protruding upwards, and the protruding block 25 penetrates upwards through the upper rack 15 and corresponds to the button 20, so that the button 20 can conveniently press the lower rack 17.

In order to prevent misoperation, the handle body 1 is further provided with a safety mechanism, the safety mechanism is used for blocking the push button 20 from being pressed downwards, and the push button 20 can be pressed downwards after the safety mechanism releases the blocking of the push button 20.

In this embodiment, the safety mechanism includes a knob 26, the button 20 is also sleeved in the knob 26, the knob 26 is rotatable to a locking position and an unlocking position, the knob 26 is further connected with a reset mechanism, and the reset mechanism enables the knob 26 to have a tendency of rotating to the locking position. The reset mechanism in this embodiment is a torsion spring 27, one end of the torsion spring 27 is connected to the knob 26, and the other end of the torsion spring 27 is connected to the button seat 21.

A knob positioning mechanism is further arranged between the knob 26 and the button 20, and when the knob 26 is in a locking position under the action of the torsion spring 27, the button 20 is blocked by the knob 26 and cannot be pressed down; when the knob 26 is rotated to the unlocking position, the knob 26 is positioned by the knob positioning mechanism and is kept at the unlocking position, at the moment, the knob 26 no longer blocks the button 20, so that the button 20 can be pressed down, and after the button 20 is pressed down, under the positioning of the knob positioning mechanism, the knob 26 is still approximately positioned at the unlocking position; when the button 20 is lifted back, the knob positioning mechanism no longer positions the knob 26, and the knob 26 automatically returns to the locking position under the action of the torsion spring 27.

In this embodiment, the knob 26 is provided with a stopper 28 protruding inward in the radial direction, and the button 20 is provided with a positioning block 29 corresponding to the stopper 28. When the knob 26 is rotated to the locking position, the positioning block 29 of the button 20 is positioned above the stopper 28, so that the positioning block 29 is blocked by the stopper 28, and the button 20 cannot be pressed down; when the knob 26 is rotated to the unlocking position, the stopper 28 no longer blocks the positioning block 29, so that the button 20 can be smoothly pushed down.

In this embodiment, the knob positioning mechanism includes a slot 30 disposed in the knob 26 and a latch 31 disposed on the button 20. The reasonable arrangement mode of the clamping groove and the clamping block is as follows: the knob 26 is provided with a ring 32, the engaging groove 30 is provided on the ring 32, the engaging block 31 is pressed against the ring 32 under the action of the third elastic device, and when the rotation stopping block 22 is provided, the engaging block 31 can be provided on the rotation stopping block 22. When the knob 26 is rotated to the unlocking position, the latch 31 is latched in the latch slot 30 to position the knob 26; the knob positioning mechanism further comprises the stopper 28 and a positioning block, after the button 20 is pressed down, the stopper 31 is separated from the slot 30, at this time, the knob 26 rotates a little under the action of the torsion spring 27, but the side surface of the stopper 28 is abutted against the side surface of the positioning block 29, so that the knob 26 is positioned and still approximately positioned at the unlocking position.

In this embodiment, the ring 32 has a groove wall 33 to form the locking groove 30 between the groove walls 33, and a first inclined surface 34 is disposed on the groove wall facing the locking block, so that the groove wall can smoothly pass over the locking block and then the locking block 31 is locked in the locking groove 30. In order to make the latch 31 enter the slot 30 more smoothly, the latch 31 is provided with a second inclined surface 35 adapted to the first inclined surface 34.

Of course, the arrangement of the clamping groove can also adopt other modes, for example, the clamping groove is directly arranged as a groove on the ring channel.

Claims

1. A detachable handle for a pot comprises a handle body, wherein a movable plate capable of moving back and forth along the handle body is arranged in the handle body, the front end of the movable plate penetrates through the handle body, a clamping piece is arranged at the front end of the movable plate, and an interlayer is formed between the clamping piece and the front end face of the handle body;

the method is characterized in that: the driving mechanism comprises a shifting piece and a handle connected to the lower side of the handle body, the front part of the handle is rotatably connected to the handle body, the rear part of the handle is movably connected with the lower part of the shifting piece, the middle part of the shifting piece is rotatably connected to the handle body, and the upper part of the shifting piece is movably connected with the rear part of the moving plate;

2. The handle for a detachable pan according to claim 1, wherein: the handle body is also provided with a button seat, the button is sleeved in the button seat, and the button seat limits the button so that the button can only move up and down but not rotate;

a knob positioning mechanism is further arranged between the knob and the button, and when the knob is in a locking position under the action of the reset mechanism, the button is blocked by the knob so as not to be pressed down; when the knob is rotated to the unlocking position, the knob is positioned by the knob positioning mechanism and is kept at the unlocking position, the knob does not block the button at the moment, so that the button can be pressed down, and the knob is still approximately positioned at the unlocking position under the positioning of the knob positioning mechanism after the button is pressed down; when the button rises, the knob positioning mechanism does not position the knob any more, and the knob automatically returns to the locking position under the action of the reset mechanism.

3. The handle for a detachable pan according to claim 2, characterized in that: the reset mechanism is a torsion spring, one end of the torsion spring is connected to the knob, and the other end of the torsion spring is connected to the button seat.

4. The handle for a detachable pan according to claim 2, characterized in that: a radially inward convex stop block is arranged in the knob, and a positioning block corresponding to the stop block is arranged on the button;

5. The handle for a detachable pan according to claim 4, wherein: the knob positioning mechanism comprises a clamping groove arranged in the knob and a clamping block arranged on the button, and when the knob is rotated to an unlocking position, the clamping block is clamped into the clamping groove so as to position the knob;

the knob positioning mechanism further comprises the check block and a positioning block, the check block is separated from the clamping groove after the button is pressed down, and the side surface of the check block is abutted against the side surface of the positioning block, so that the knob is positioned and still approximately positioned at the unlocking position.

6. The handle for a detachable pan according to claim 5, characterized in that: the knob is internally provided with a loop, the clamping groove is arranged on the loop, and the clamping block is abutted against the loop under the action force of the third elastic device.

7. The handle for a detachable pan according to claim 6, characterized in that: the ring is provided with groove walls to form the clamping groove between the groove walls, and the groove wall facing the clamping block is provided with a first inclined surface, so that the groove walls can smoothly pass over the clamping block and then the clamping block is clamped into the clamping groove.

8. The handle for a detachable pan according to claim 7, wherein: the fixture block is provided with a second inclined plane matched with the first inclined plane.

9. The handle for a detachable pan according to claim 2, characterized in that: the button is provided with a rotation stopping block, the side wall of the button seat is provided with a rotation stopping groove, and the rotation stopping block is positioned in the rotation stopping groove.

10. The detachable pot handle according to any one of claims 1 to 9, wherein: the handle body is provided with a handle rotating shaft, and the front part of the handle is arranged on the handle rotating shaft in a penetrating way;

11. A detachable handle for a pot as claimed in any one of claims 1 to 9 wherein: the handle in be equipped with the spring fixed block, the spring fixed block be located the place ahead at movable plate rear portion, first resilient means be first extension spring, the front end hook of first extension spring be in the spring fixed block on, the rear end hook of first extension spring is in the rear portion of movable plate.

12. The detachable pot handle according to any one of claims 1 to 9, wherein: the second elastic device is a second tension spring, the front end of the second tension spring is hooked on the handle body, the rear end of the second tension spring is hooked on the front portion of the positioning arm, the front end of the second tension spring is higher than the rear end of the second tension spring, and therefore the inclined second tension spring pulls the positioning arm to push up.

13. The detachable pot handle according to any one of claims 1 to 9, wherein: the lower rack is provided with a convex block which protrudes upwards, and the convex block penetrates through the upper rack upwards and corresponds to the button.