CN108451373B

CN108451373B - Cover body opening and closing damping limiting device and cooking utensil

Info

Publication number: CN108451373B
Application number: CN201810245910.4A
Authority: CN
Inventors: 倪祖根
Original assignee: Kingclean Electric Co Ltd
Current assignee: Kingclean Electric Co Ltd
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2023-11-17
Anticipated expiration: 2038-03-23
Also published as: CN108451373A

Abstract

The invention discloses a cover opening and closing damping limiting device and a cooking utensil, wherein the cover opening and closing damping limiting device realizes self-locking when passing through the damping device, so that the cooking utensil is fixed at any angle within a defined maximum opening and closing cover angle range, is not limited by the weight of a cooker cover, and is convenient to use.

Description

Cover body opening and closing damping limiting device and cooking utensil

Technical Field

The invention relates to the technical field of cooking appliances, in particular to a cover opening and closing damping limiting device and a cooking appliance.

Background

There are many types of electric cookers on the market, wherein the cover opening and closing form according to the cooker cover mainly has split type and disjunctor type, wherein, split type cooker cover is separated with the pedestal, when taking out food, need take down the cooker cover and find place in addition and place, user's use is inconvenient, and disjunctor type cooker cover is with pedestal swing joint, cooker cover and pedestal need not separate, user's use is more convenient, therefore the pot of this kind of disjunctor type cooker cover is more and more popular, specifically, disjunctor type cooker cover is articulated on the pedestal through the pivot generally, the pivot cover is equipped with the torsional spring, the both ends stabilizer blade of torsional spring is blocked respectively on pedestal and cooker cover, when opening the cooker cover, the cooker cover is spring open under the torsional spring effect and is auto-lock through the auto-lock structure.

The opening and closing conditions of the commonly used integrated pot cover are as follows:

1. like ordinary rice cooker, the pot cover is lighter, and when the pot cover was opened, the relative rotation between articulated part and the relative articulated part of pot cover, the auto-lock of uncapping was realized by the hook lock between spring and simple spare part, and the cover that opens and shuts is simple, but only is applicable to the light such condition of pot cover, just can not adopt this kind of structure when the pot cover is heavier.

2. When the pot cover is heavy, like the pot covers of an eggbeater, a meat grinder, a dough kneading device and a frying pot, the pot cover is provided with accessories such as a motor, a wind wheel, a blade and the like, so that the pot cover is heavy, and a common cover opening self-locking structure cannot support a limiting function at a certain angle, and therefore, all the machines are provided with a lock head mechanism for locking the machine head; specifically, the locating pin is inserted into the middle of two parts to fix the two parts, and after the cover is opened, the switch is pressed to enable the locating pin to pass through the two parts to fix the two parts, and the fixing mode is limited to a specific angle, so that the requirements of different customers at any different angles cannot be met, and the operation is inconvenient because an additional auxiliary switch is generally needed to be added.

Based on this, a device capable of realizing self-locking limit at any angle position is needed to meet the use demands of customers.

Disclosure of Invention

The invention aims to provide a cover opening and closing damping limiting device and a cooking utensil, which can realize self-locking limiting of any angle position of a pot cover, are not limited by the weight of the pot cover, and are convenient to use.

To achieve the purpose, the invention adopts the following technical scheme:

on the one hand, the invention provides a cover opening and closing damping limiting device, which comprises a base and a cover body covered on the base, wherein the cover body is opened or closed around the base.

The damping device comprises a fixed part and a movable part capable of rotating relative to the fixed part, wherein the fixed part is arranged on the base body, the movable part is arranged on the cover body, and the fixed part and the movable part move relative to each other to generate damping force.

The cover body and the base body respectively comprise a first pivot and a second pivot which rotate relatively, the movable part is fixed on the first pivot, and the fixed part is fixed on the second pivot.

Wherein the movable part is arranged in the first pivot and is in friction contact with the first pivot, the fixed part is fixed with the second pivot,

when the first pivot rotates around the central axis of the first pivot, the first pivot drives the movable part to rotate in the same direction to generate damping force, so that the first pivot stays at any angle.

The connecting shaft is arranged at one end of the first pivot, the movable part is located in the first inner cavity, the end face, far away from the second pivot, of the movable part is in friction contact with the inner bottom surface of the first inner cavity, the second inner cavity is arranged at one end, far away from the first pivot, of the second pivot, and the connecting shaft penetrates through the second pivot from the second inner cavity and then is fixedly connected with the fixing part.

The movable part comprises a lock plate and a roller arranged in the lock plate, the fixed part comprises a transmission shaft, the connecting shaft is fixedly connected with the second pivot, one end of the transmission shaft stretches into the lock plate and is matched with the lock plate, and the other end of the transmission shaft is fixedly connected with the connecting shaft.

Wherein the movable part further comprises a gland, a third inner cavity is arranged at one end of the lock plate, facing the gland, of the lock plate, the gland is arranged at the opening of the third inner cavity, the third inner cavity comprises a middle cavity which is positioned at the central axis of the lock plate and used for the transmission shaft to extend in, and a side cavity which is positioned at the periphery of the middle cavity and communicated with the middle cavity, the side cavity is an arc-shaped groove, the roller is arranged in the side cavity,

the side surface of the roller is matched with the cylindrical surface of the transmission shaft in an extrusion mode so that the roller can roll from one end of the arc-shaped groove to the other end of the arc-shaped groove.

The space of the arc-shaped groove gradually increases from one end of the arc-shaped groove to the other end, one end of the arc-shaped groove is a large end, the other end of the arc-shaped groove is a small end, and the large end and the small end are sequentially arranged in the opening direction of the cover body.

The lock plate is provided with a lock plate connecting hole around the third inner cavity towards one end of the gland, a limit post is arranged at one end of the gland towards the lock plate, corresponding to the lock plate connecting hole, and the limit post is inserted into the lock plate connecting hole.

The center of the gland is provided with a gland hole corresponding to the middle cavity, and the transmission shaft penetrates through the gland hole and stretches into the middle cavity.

The connecting shaft comprises a limiting pin, a limiting pin hole is formed in the transmission shaft, and the limiting pin is inserted into the limiting pin hole to be matched with the limiting pin hole, so that the transmission shaft is fixedly connected with the connecting shaft.

The connecting shaft further comprises a connecting shaft body, one end of the connecting shaft body is connected with a flange plate, the other end of the connecting shaft body is connected with the limiting pin, a first through hole penetrating through the second pivot is formed in the second inner cavity, the connecting shaft body penetrates through the first through hole, and the flange plate is located in the second inner cavity and fixedly connected with the second pivot.

The periphery of the transmission shaft is provided with a limiting ring, and the limiting ring is used for propping against the gland.

The novel clamping device comprises a clamping plate, and is characterized by further comprising the clamping plate, wherein the clamping plate comprises a clamping plate body, a step hole is formed in the middle of the clamping plate body, and the transmission shaft penetrates through the step hole and is clamped into the step surface of the step hole.

On the other hand, the invention also provides a cooking utensil, which comprises a cover body, a base body and the cover body opening and closing damping limiting device, wherein the first pivot of the cover body opening and closing damping limiting device is fixed at the bottom of the rear end of the cover body, and the second pivot is fixed at the top of the rear end of the base body.

The beneficial effects of the invention are as follows:

the invention relates to a cover opening and closing damping limiting device and a cooking utensil with the same, which comprise a first pivot connected with a cover body and a second pivot connected with a base body, wherein the first pivot can rotate around a central axis of the first pivot relative to the second pivot, the damping device comprises a movable part and a fixed part, the movable part is connected with the first pivot, the fixed part is connected with the second pivot, and when the first pivot rotates, the movable part is driven to cooperate with the fixed part to generate damping force, so that the first pivot can stay at any angle position, self-locking limiting of any angle position of a pot cover can be realized, the self-locking limiting device is not limited by the weight of the pot cover, and the self-locking limiting device is convenient to use.

Drawings

Fig. 1 is a schematic view of a cooking appliance according to the present invention in a state in which a cover is opened;

FIG. 2 is an exploded view of the cover opening and closing damping limiting device of the present invention;

FIG. 3 is a schematic diagram of a damping device;

FIG. 4 is a schematic view of the structure of the pot cover in FIG. 2;

FIG. 5 is a schematic view of the base in FIG. 2;

FIG. 6 is a second schematic structural view of the base in FIG. 2;

FIG. 7 is a schematic view of the structure of the connecting shaft of FIG. 2;

FIG. 8 is a schematic diagram of the platen of FIG. 2;

FIG. 9 is a second schematic structural view of the platen of FIG. 2;

FIG. 10 is a schematic view of the drive shaft of FIG. 2;

FIG. 11 is a schematic view of the gland of FIG. 2;

fig. 12 is a schematic view of the structure of the lock plate in fig. 2.

In the figure: 100-cover body; 200-a base; 300-damping means;

10-a first pivot; 11-a first lumen; 12-a first pivot connection hole; 13-a pivot mating surface; 14-a slider;

20-a second pivot; 21-a second lumen; 22-a second pivot connection hole; 23-a first through hole; 24-sliding grooves; 25-a second through hole;

30-connecting shafts; 31-a connecting shaft body; 32-flange plates; 33-limiting pins; 34-flange connection holes;

40-pressing plates; 41-a platen body; 42-step holes; 43-platen attachment holes; 44-guard plates; 45-step surface;

50-a transmission shaft; 51-limiting rings; 52-a cylindrical surface; 53-limit pin holes;

60-gland; 61-capping the hole; 62-limiting columns;

70-locking plate; 71-an intermediate cavity; 72-locking plate mating surface; 73-side cavity; 74—small end; 75-big end; 76-a latch plate attachment hole;

80-roller.

Detailed Description

The technical scheme of the invention is further described below by means of specific embodiments in combination with the accompanying drawings 1-12.

Referring to fig. 1 and 2, the present invention provides a cover opening and closing damping limiting device for a cooking appliance. The cooking appliance includes a base 200 and a cover 100 covering the base 200.

Referring to fig. 2, the cover body 100 is covered on the base body 200 and can rotate around the base body 200 to realize opening or closing, the cover body 100 is connected with the base body 200 through a cover body opening and closing damping limiting device, when the cover body 100 is opened, the cover body can stay at any angle position, self-locking limiting of any angle position of the cover can be realized, and the cover is not limited by the weight of the cover and is convenient to use.

The cover opening and closing damping limiting device comprises a damping device 300, wherein the damping device 300 comprises a fixed part and a movable part capable of rotating relative to the fixed part, the fixed part is arranged on the base 200, the movable part is arranged on the cover 100, and damping force is generated by the relative movement of the fixed part and the movable part.

Specifically, the cover opening and closing damping limiting device includes a first pivot 10 and a second pivot 20 which are coaxially and relatively rotatably disposed, wherein the first pivot 10 is disposed at one end of the cover 100, the second pivot 20 is disposed at one end of the base 200, and the first pivot 10 can rotate around its central axis relative to the second pivot 20 along with opening and closing of the cover 100. The movable part of the damping device 300 is fixedly connected with the first pivot 10, and the fixed part of the damping device 300 is fixedly connected with the second pivot 20. In other embodiments, the movable portion of the damping device 300 may be directly disposed on the cover 100 or integrally formed with the cover, and the fixed portion of the damping device 300 may be directly disposed on the base 200 or integrally formed with the base 200. When the cover 100 is opened and closed, the cover 100 drives the movable part and the fixed part of the damping device 300 to cooperate to generate damping force, so that the cover 100 stays at any angle.

Referring further to fig. 2, the damping device 300 of the present invention is a mechanical damper, and other types of dampers may be used instead in other embodiments, and in this embodiment, the damping device 300 includes a lock plate 70, a transmission shaft 50 disposed at the center of the lock plate 70, and a roller 80 clamped between the lock plate 70 and the transmission shaft 50.

The lock plate 70 includes a third inner cavity at the central axis, the third inner cavity includes a middle cavity 71 at the central axis of the lock plate 70 for the transmission shaft 50 to extend into, and a side cavity 73 at the peripheral side of the middle cavity 71, one end of the transmission shaft 50 is extended and accommodated in the middle cavity 71, and the side cavity 73 is communicated with the middle cavity 71.

As shown in fig. 12, the side cavity 73 is an arc-shaped groove in which a roller 80 having a central axis parallel to the central axis of the drive shaft 50 is disposed. As shown in fig. 10, the outer periphery of the portion of the drive shaft 50 extending into the intermediate chamber 71 is a cylindrical surface 52, and as shown in fig. 3, when the drive shaft 50 rotates, the roller 80 rolls against the roller 80 and drives the roller 80 to roll in the opposite direction in the side chamber 73. Preferably, the side cavities 73 are uniformly distributed around the middle cavity 71 in a ring shape, and the number of the side cavities is 3.

In order to change the pressing damping force of the roller 80 with respect to the propeller shaft 50 during the change of the position of the roller 80, referring to fig. 3 and 12, the vertical distance from the point on the center line of the arc-shaped groove to the center axis of the propeller shaft 50 gradually increases from one end to the other end of the radial width of the arc-shaped groove, one end of the arc-shaped groove is spaced from the large end 75 and the other end is spaced from the small end 74, and the large end 75 and the small end 74 are sequentially arranged in the opening direction of the cover 100.

In the embodiment of the present invention, the lock plate 70 of the damping device is a movable portion, the transmission shaft 50 is a fixed portion, referring to fig. 4, a first inner cavity 11 is formed at one end of the first pivot 10, the lock plate 70 is accommodated and fixed in the first inner cavity 11, and a pressing plate 40 is disposed at an opening of the first inner cavity 11 to seal the lock plate 70 in the first inner cavity 11.

The locking plate 70 is rotatably disposed between the pressing plate 40 and the inner bottom surface of the first inner cavity 11, and an end surface of the locking plate 70 away from the pressing plate 40 is in friction contact with the inner bottom surface of the first inner cavity 11, and one end of the transmission shaft 50 extends into the locking plate 70 and is matched with the locking plate 70.

Referring to fig. 5 and 6, a second inner cavity 21 is formed at one end, far away from the first pivot 10, of the second pivot 20, a connecting shaft 30 is fixedly arranged in the second pivot 20, penetrates through the second inner cavity 21 and extends into the first inner cavity 11, referring to fig. 10, a limit pin hole 53 is formed in the transmission shaft 50, referring to fig. 7, the connecting shaft 30 comprises a limit pin 33, and the limit pin 33 is inserted into the limit pin hole 53 to be matched with the connecting shaft 30, so that the transmission shaft 50 is fixedly connected with the connecting shaft 30. Preferably, both the end surfaces of the stopper pin hole 53 and the stopper pin 33 are polygonal in shape.

Referring to fig. 2 and 7, the connection shaft 30 further includes a connection shaft body 31, one end of the connection shaft body 31 is connected with a flange plate 32, and the other end extends as a stopper pin 33. Referring to fig. 6, a first through hole 23 penetrating the second pivot 20 is formed in the second inner cavity 21, a connection shaft body 31 is inserted into the first through hole 23, and a flange plate 32 is positioned in the first inner cavity 11 and fixedly connected with the second pivot 20. Specifically, the flange plate 32 is provided with a flange connection hole 34, the second pivot shaft 20 is provided with a second pivot shaft connection hole 22, and the flange connection hole 34 and the second pivot shaft connection hole 22 are fixedly connected by a screw.

Referring to fig. 2 and 11, the damping device 300 further includes a gland 60, the gland 60 is disposed at an opening of the third inner cavity, a gland hole 61 is formed in a center of the gland 60 corresponding to the middle cavity 71, and the transmission shaft 50 extends into the middle cavity 71 through the gland hole 61.

The end of the lock plate 70 facing the press cover 60 surrounds the third inner cavity, a lock plate connecting hole 76 is formed, a limit post 62 is provided at the end of the press cover 60 facing the lock plate 70 corresponding to the lock plate connecting hole 76, the limit post 62 is inserted into the lock plate connecting hole 76, and the movement of the roller 80 is limited in the axial direction of the first pivot 10 and the second pivot 20 by the press cover 60, so that the roller 80 is prevented from falling off.

Referring to fig. 10, a stopper ring 51 is provided at the outer circumference of the driving shaft 50, and the stopper ring 51 is located between the pressing cover 60 and the pressing plate 40. Referring to fig. 9, the pressing plate 40 includes a pressing plate body 41, a stepped hole 42 is formed in the middle of the pressing plate body 41, a transmission shaft 50 passes through the stepped hole 42, and a limit ring 51 is clamped on a stepped surface 45 of the stepped hole 42. The platen 40 includes a platen attachment hole 43, the first pivot shaft 10 includes a first pivot shaft attachment hole 12, and the platen attachment hole 43 and the first pivot shaft attachment hole 12 are attached by a screw. Further, the platen body 41 extends toward the lock plate 70 with a guard plate 44, and the guard plate 44 surrounds the lock plate 70. Therefore, the transmission shaft 50 can be limited in the axial direction through the pressing plate 40, the transmission shaft 50 is prevented from moving out of the middle cavity, and the reliability of the opening and closing cover is ensured.

On the basis of the scheme, the other end of the first pivot 10 far away from the second pivot 20 is further provided with an auxiliary second pivot, the bottom surface of the auxiliary second pivot is provided with a second through hole 25, correspondingly, one end of the first pivot 10 far away from the first inner cavity is provided with a connecting hole, and the connecting piece realizes the rotary connection between the first pivot and the auxiliary second pivot through the second through hole 25 and the connecting hole. The auxiliary second pivot is coaxially arranged with the first pivot and the second pivot and is arranged at intervals with the second pivot, so that the first pivot can be arranged at intervals formed by the second pivot and the auxiliary second pivot, the auxiliary second pivot can limit and support the first pivot, and the stability of the opening and closing process is better.

Further, an arc-shaped chute 24 is provided at the top of the base between the second pivot and the auxiliary second pivot, and correspondingly, a slide block 14 is provided on the outer circumferential surface of the first pivot 10, and the slide block 14 can slide along the chute 24, in this embodiment, the arc direction of the chute 24 is consistent with the bending direction of the circumferential surfaces of the first pivot 10 and the second pivot 20, and by matching the slide block 14 and the chute 24, the start and end positions of the cover can be ensured, so that the maximum rotation angle range of the cover is ensured.

Referring to fig. 12, in the new embodiment of the present invention, the end surface of the lock plate 70, which is far away from the pressing plate 40, is a lock plate mating surface 72, the inner bottom surface of the first inner cavity 11 is a pivot mating surface 13, and the lock plate mating surface 72 is in friction contact with the pivot mating surface 13, so that when the first pivot 10 rotates, the lock plate 70 can be driven to rotate by the friction force between the lock plate mating surface 72 and the pivot mating surface 13. In other embodiments, other means of fixation may be employed.

The working principle of the invention is as follows:

when the cover is closed, the lock plate rotates along with the cover body, the roller moves from the large end to the small end of the side cavity in the lock plate, and the roller is in interference fit with the lock plate and the transmission shaft, so that the roller has a large damping force on the transmission shaft; meanwhile, the transmission shaft is matched with the connecting shaft through the limiting pin, so that damping force received by the transmission shaft is transmitted to the connecting shaft, and the connecting shaft is connected with the base body and kept still together. The damping force can keep the cover body still without the action of external force, so that the limiting function of the cover body at any angle in the cover opening angle defined by the product is realized, and in actual operation, if the cover is wanted to be closed, the damping force is applied slightly, so that the structure is simple, and the user operation is convenient.

When uncapping, the damping force is substantially zero, specifically: in the process of uncapping, the lid drives the latch plate and rotates, and the roller moves along the arc orbit in the damping space of latch plate, and the latch plate drives the roller and moves to the big end along the tip of the side cavity of latch plate, and the roller is located the orbit big end of latch plate always this moment, keeps clearance fit with the mating surface of transmission shaft, and the transmission shaft is not stressed, keeps relatively static, does not have the effort of rotation direction to the lid at the in-process pedestal that the lid opened, therefore the lid can be easily opened.

The invention can be applied to various cooking appliances with heavier cover bodies, in particular to fryers and the like. For the frying pan, the cover part of the frying pan is provided with a motor, a wind wheel, a heating component and the like, so that the cover is much heavier than a common cover, when the cover is opened, an operator can not conveniently take and put articles while holding the cover, and the cover is unsafe, so that the cover can be convenient when the cover can realize any angle self-locking function. The existing method is usually realized by a knob and a button, so that the use method of the knob and the button is difficult to grasp on the premise that a specification is not read when a new user uses the method, and inconvenience is brought to the operation of the user. In contrast, the structure of the invention does not need any knob or button, and can be easily opened by only manually opening and closing the cover normally, and the pot cover can be fixed at any angle, thereby greatly facilitating the user.

In summary, the invention overcomes the defects of the prior art, and provides a structure which utilizes internal damping force to come from a lock, the cover body can realize vertical limit after the cover is opened to the maximum angle, the cover can be automatically fixed at any angle in the cover closing process, the cover can be fixed at any angle within the maximum opening and closing angles defined by products, the requirements of different customers on different fixing angles are met, no additional switch is needed, and the cover is fixed by additional force, so that the operation is simpler and more convenient.

The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims

1. The cover body opening and closing damping limiting device comprises a base body and a cover body which is covered on the base body, wherein the cover body is opened or closed around the base body;

the damping device comprises a fixed part and a movable part capable of rotating relative to the fixed part, the fixed part is arranged on the base body, the movable part is arranged on the cover body, and the fixed part and the movable part move relative to each other to generate damping force;

the movable part comprises a lock plate and a roller arranged in the lock plate, and the fixed part comprises a transmission shaft;

the movable part also comprises a gland, a third inner cavity is arranged at one end of the lock plate, which faces the gland, the gland is arranged at the opening of the third inner cavity, the third inner cavity comprises a middle cavity which is positioned at the central axis of the lock plate and is used for the transmission shaft to extend in, and a side cavity which is positioned at the periphery of the middle cavity and is communicated with the middle cavity, the side cavity is an arc-shaped groove, the roller is arranged in the side cavity,

2. The cover opening and closing damping limiting device according to claim 1, wherein the cover and the base respectively comprise a first pivot and a second pivot which rotate relatively, the movable portion is fixed on the first pivot, and the fixed portion is fixed on the second pivot.

3. The cover opening and closing damping limiting device according to claim 2, wherein the movable part is disposed in the first pivot and is in frictional contact with the first pivot, the fixed part is fixed with the second pivot,

4. The cover opening and closing damping limiting device according to claim 3, further comprising a connecting shaft, wherein a first inner cavity is formed at one end of the first pivot, the movable portion is located in the first inner cavity, an end face, far away from the second pivot, of the movable portion is in friction contact with an inner bottom face of the first inner cavity, a second inner cavity is formed at one end, far away from the first pivot, of the second pivot, and the connecting shaft penetrates through the second pivot from the second inner cavity and is fixedly connected with the fixing portion.

5. The cover opening and closing damping limiting device according to claim 4, wherein the connecting shaft is fixedly connected with the second pivot, one end of the transmission shaft extends into the lock plate and is matched with the lock plate, and the other end of the transmission shaft is fixedly connected with the connecting shaft;

6. The cover opening and closing damping limiting device according to claim 1, wherein the space of the arc-shaped groove gradually increases from one end to the other end of the arc-shaped groove, one end of the arc-shaped groove is a large end, the other end of the arc-shaped groove is a small end, and the large end and the small end are sequentially arranged in the cover opening direction.

7. The cover opening and closing damping limiting device according to claim 1, wherein a locking plate connecting hole is formed around the third inner cavity at one end of the locking plate facing the pressing cover, a limiting post is arranged at one end of the pressing cover facing the locking plate, corresponding to the locking plate connecting hole, and the limiting post is inserted into the locking plate connecting hole.

8. The cover opening and closing damping limiting device according to claim 1, wherein a gland hole is formed in the center of the gland corresponding to the middle cavity, and the transmission shaft penetrates through the gland hole and stretches into the middle cavity.

9. The cover opening and closing damping limiting device according to claim 5, wherein the connecting shaft further comprises a connecting shaft body, one end of the connecting shaft body is connected with a flange plate, the other end of the connecting shaft body is connected with the limiting pin, a first through hole penetrating through the second pivot is formed in the second inner cavity, the connecting shaft body penetrates through the first through hole, and the flange plate is located in the second inner cavity and fixedly connected with the second pivot.

10. The cover opening and closing damping limiting device according to claim 1, wherein a limiting ring is arranged on the periphery of the transmission shaft and used for propping against the gland.

11. The cover opening and closing damping limiting device according to claim 10, further comprising a pressing plate, wherein the pressing plate comprises a pressing plate body, a step hole is formed in the middle of the pressing plate body, and the transmission shaft penetrates through the step hole and the limiting ring is clamped into the step surface of the step hole.

12. A cooking appliance comprising a cover and a base, characterized in that it further comprises a cover opening/closing damping limiting device according to any one of claims 1 to 11.