A buckle structure and a cooking device

Abstract

The latch structure and cooking device provided by the present invention include: a locking pin; an opening structure having an opening facing the locking pin, and the inner diameter of the opening structure gradually increases along the direction away from the opening; a cylinder body disposed inside the opening structure and abutting against the inner wall of the opening structure, the cylinder body having the same opening direction as the opening structure and being adapted to accommodate the locking pin, the cylinder body including a limiting portion; and a stroke maintaining portion acting on the cylinder body; the limiting portion has a locking state of limiting the locking pin under the action of the stroke maintaining portion. Such a setting, on the one hand, avoids sudden changes in the stroke, thereby preventing the destruction of the locking state between the limiting portion and the locking pin. On the other hand, during the process of the locking pin being withdrawn from the cylinder body, the common stroke of the locking pin, the cylinder body, and the limiting portion will be restricted by the inner diameter of the opening structure that gradually decreases towards the opening, thereby effectively maintaining the locking state and improving the reliability of the latch structure.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a locking structure and a cooking device. Background Art

[0002] Currently, the upper cover and the pot body of household appliances such as rice cookers are generally fastened by a snap-fit structure. An elastic buckle is installed on the upper cover or the pot body. When fastening, the elastic buckle is pressed by a guiding inclined plane, the elastic buckle deforms, and after yielding, the elastic buckle position is fastened to fix the upper cover. When it is necessary to open the cover, press the open cover button to drive the open cover lock to disengage from the fastening position, so as to smoothly open the rice cooker cover.

[0003] However, such a fastening method, since it is only carried out by the mutual engagement between elastic buckles and there is no specifically provided locking structure during use, may cause too large a gap between the upper cover and the pot body after fastening, easily causing problems such as overflowing of the pot, and reducing the user experience. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor stability and reliability of the fastening method of the elastic snap structure in the prior art, so as to provide a new locking structure and a cooking device.

[0005] The present invention provides a locking structure, including: a locking pin;

[0006] An opening structure, having an opening facing the locking pin, and the inner diameter of the opening structure gradually increases along the direction away from the opening;

[0007] A cylinder body, arranged inside the opening structure and in contact with the inner wall of the opening structure. The cylinder body has the same opening direction as the opening structure and is adapted to accommodate the locking pin. The cylinder body includes a limiting portion; and

[0008] A stroke maintaining portion, acting on the cylinder body;

[0009] The limiting portion has a locking state of limiting the locking pin under the action of the stroke maintaining portion.

[0010] The limiting portion is rigidly arranged and includes:

[0011] A plurality of accommodating holes, arranged circumferentially on the side wall of the cylinder body;

[0012] Limiting blocks, arranged in the accommodating holes and protruding from the inner wall of the cylinder body, adapted to move along the accommodating holes under the action of an external force and respectively contact the locking pin and the inner wall of the opening structure.

[0013] The locking pin is coaxially arranged with the cylinder body and the opening structure. The included angle between the locking pin and the inner wall of the opening structure is α, and α is less than or equal to arctanμ, where μ is the friction coefficient between the locking pin and the limiting block.

[0014] The limiting block is a sphere.

[0015] The cylinder body includes a limiting end, which is arranged inside the opening structure and abuts against the opening structure. The limiting end is arranged in the same shape as the opening structure, and the accommodating hole is arranged on the side wall of the limiting end.

[0016] The locking structure further includes an inner cavity, at the top of which the opening structure is arranged, and the cylinder body and the stroke maintaining part are arranged in the inner cavity.

[0017] The stroke maintaining part is an elastic member arranged on the circumference of the cylinder body. One end of the stroke maintaining part abuts against the bottom surface of the limiting end, and the other end abuts against the protruding part protruding towards the cylinder body on the inner cavity.

[0018] The locking structure further includes an unlocking structure, which acts on the cylinder body and is adapted to control the lifting of the cylinder body so as to control the limiting part to release the limit on the locking pin.

[0019] The unlocking structure includes: a swing rod structure, which is adapted to rotate along a fixed axis and includes a connecting end and a control end. The connecting end passes through a connecting hole arranged on the bottom side of the cylinder body.

[0020] The unlocking structure is a connecting rod structure, including: a first engaging part arranged at one end of the unlocking structure and connected in a matching manner with a first accommodating groove with an elastic member on the inner cavity;

[0021] a second engaging part arranged at the other end of the unlocking structure and connected in a matching manner with a first fitting part protruding on the inner cavity;

[0022] an inclined part passing through the connecting hole on the bottom side of the cylinder body, and the inner edge of the connecting hole is arranged in a circular convex shape.

[0023] The unlocking structure further includes: a switch structure, which is arranged adjacent to the swing rod structure or the connecting rod structure and includes a switch shaft connected with an elastic member. The switch shaft is adapted to move along a fixed track under an external force and apply pressure to the control end or the second engaging part.

[0024] A profiling sleeve is embedded on the inner wall of the opening structure, and the profiling sleeve, the locking pin and the limiting block are all metal parts.

[0025] The locking structure further includes a closing detection device, which is respectively in communication connection with the profiling sleeve, the locking pin and the limiting block.

[0026] This embodiment also provides a cooking device, including the above latch structure.

[0027] The cooking device includes: a lid body, on which a concave portion is provided, the concave portion includes an opening, and a locking pin extending toward the outside of the opening is built therein;

[0028] A pot body, on which the opening structure, the cylinder body, and the stroke maintaining portion are provided, and at least a part of the opening structure is adapted to be embedded in the concave portion in the locking state.

[0029] The technical solution of the present invention has the following advantages:

[0030] 1. The latch structure provided by the present invention includes: a locking pin; an opening structure, which is provided with an opening facing the locking pin, and the inner diameter of the opening structure gradually increases along the direction away from the opening; a cylinder body, which is arranged inside the opening structure and abuts against the inner wall of the opening structure, the cylinder body has the same opening direction as the opening structure and is adapted to accommodate the locking pin, and the cylinder body includes a limiting portion; and a stroke maintaining portion, which acts on the cylinder body; the limiting portion has a locking state of limiting the locking pin under the action of the stroke maintaining portion.

[0031] The cylinder body abuts against the opening structure with an inner diameter gradually increasing along the direction away from the opening, accommodates the locking pin in the cylinder body, and limits it through the limiting portion. In addition, a stroke maintaining portion acting on the cylinder body is provided, so that the cylinder body keeps abutting against the inner wall of the opening structure, and also makes the locking pin, the cylinder body, and the limiting portion have the same stroke during the movement. Such a setting, on the one hand, avoids sudden changes in stroke, thereby destroying the locking state between the limiting portion and the locking pin. On the other hand, during the process of the locking pin being pulled out of the cylinder body, the common stroke of the locking pin, the cylinder body, and the limiting portion will be restricted by the inner diameter of the opening structure that gradually decreases toward the opening, thereby effectively maintaining the locking state, making the device with the latch structure unable to be opened after being stably closed, effectively reducing the gap of the closing structure, avoiding phenomena such as overflowing of the pot, improving the stability and reliability of the latch structure, and enhancing the user experience.

[0032] 2. In the latch structure provided by the present invention, the limiting portion is rigidly arranged and includes: a plurality of receiving holes, which are arranged on the side wall of the cylinder body along the circumferential direction; a limiting block, which is arranged in the receiving hole and protrudes from the inner wall of the cylinder body, and is adapted to move along the receiving hole under the action of an external force and respectively abut against the locking pin and the inner wall of the opening structure.

[0033] By setting the limiting part to be rigid, the stability of the action of the limiting part is ensured, and the service life of the limiting part is effectively improved. The setting of the accommodating hole restricts the movement of the limiting block on the one hand to prevent it from slipping out of the cylinder body, and provides a moving space for the limiting block on the other hand. In addition, due to the setting of the stroke maintaining part, the limiting block on the cylinder body abuts against the inner wall of the opening structure under the action of the locking pin, forming a sliding mating surface between the locking pin and the limiting block, and realizing synchronous movement of the stroke. During the process of the locking pin leaving the cylinder body, the frictional force between the locking pin and the limiting block effectively combines with the component force of the resistance applied by the inner wall of the opening structure, so that stable locking is achieved between the limiting block and the locking pin.

[0034] 3. For the lock structure provided by the present invention, the locking pin is coaxially arranged with the cylinder body and the opening structure, and the included angle between the locking pin and the inner wall of the opening structure is α, and α is less than or equal to arctanμ, where μ is the friction coefficient between the locking pin and the limiting block.

[0035] When the included angle between the locking pin and the inner wall of the opening structure is α, and α is less than or equal to arctanμ, the sum of the frictional force between the locking pin and the limiting block and the component force of the resistance applied by the inner wall of the opening structure is greater than or equal to the external force applied to take out the locking pin, realizing effective locking of the locking pin.

[0036] 4. For the lock structure provided by the present invention, the limiting block is a sphere.

[0037] Since during the process of locking or unlocking the lock structure, the limiting block may abut against or rub against the accommodating hole, the inner wall of the opening structure, and the locking pin. When the limiting block is a sphere, on the one hand, during the movement process, the sliding friction changes to rolling friction, reducing the frictional resistance, improving the flexibility of the movement of the limiting block, and avoiding problems such as frictional noise. On the other hand, the setting of the sphere causes the worn parts to change continuously during the cooperation with various structures, reducing the movement wear and improving the service life of the lock structure.

[0038] 5. For the lock structure provided by the present invention, the unlocking structure is a link structure, including: a first engaging part arranged at one end of the unlocking structure and cooperatively connected with the first accommodating groove with an elastic member on the inner cavity; a second engaging part arranged at the other end of the unlocking structure and cooperatively connected with the first fitting part protruding on the inner cavity; an inclined part passing through the connection hole at the bottom side of the cylinder body, and the inner edge of the connection hole is circularly convexly arranged.

[0039] By setting the connecting rod structure as the unlocking structure, on the one hand, through the setting of the inclined part, the control of the lifting of the cylinder can be realized. Furthermore, in the locked state of the limiting part, by further controlling the cylinder to move away from the opening structure, the separation of the limiting part and the locking pin can be achieved, and the unlocking of the locking pin can be realized; on the other hand, through the setting of the first engaging part and the second engaging part, the stability of the cylinder structure during the lifting process is ensured, and the locking structure is prevented from shaking under the action of external forces, thereby preventing the position of the cylinder from changing and causing the limiting part to disengage from the locked state, improving the working stability of the locking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 Structural schematic diagram of the locking structure provided in Embodiment 1 of the present invention;

[0042] Figure 2 Structural schematic diagram of the locking structure provided in Embodiment 2 of the present invention;

[0043] Figure 3 Structural schematic diagram of the angle formed by the locking pin and the opening structure provided in Embodiment 1 of the present invention.

[0044] Description of reference numerals:

[0045] 1 - locking pin; 2 - opening structure; 3 - cylinder; 4 - stroke holding part; 31 - receiving hole; 32 - limiting block; 33 - limiting end; 5 - inner cavity; 6 - swing rod structure; 7 - connecting rod structure; 34 - connecting hole; 8 - switch structure; 21 - profiling sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Embodiment 1:

[0051] As Figure 1 and Figure 3 shown, this embodiment provides a cooking device including a locking structure.

[0052] The cooking device includes: a lid body and a pot body. An inner concave portion is provided on the lid body. The inner concave portion includes an opening, and a locking pin 1 extending outward toward the outside of the opening is built in; the pot body is provided with an opening structure 2, a cylinder 3, and a stroke maintaining portion 4. Part of the opening structure is embedded in the inner concave portion in the locked state, so that it can be ensured that the locking pin 1 can stably penetrate into the opening structure 2 and the cylinder 3, avoiding the misalignment of the cooperation of the locking pin 1.

[0053] As a changeable embodiment, an opening structure 2, a cylinder 3, and a stroke maintaining portion 4 can be provided on the lid body, and a locking pin 1 is provided on the pot body.

[0054] The specific type of the cooking device is not limited. It only needs to satisfy including an upper housing and a lower housing, and one of them is respectively provided with an opening structure 2, a cylinder 3, and a stroke maintaining portion 4, and the other is provided with a locking pin 1. In this embodiment, the cooking device is an electric rice cooker, and it can be an electric griddle, an electric pressure cooker, a stew pot, a deep fryer, and other cooking devices that need to complete the switch function.

[0055] The buckle structure includes a locking pin 1, an opening structure 2, a cylinder 3, and a stroke maintaining portion 4.

[0056] The locking pin 1 is fixed on the concave portion of the pot body. The concave portion is arranged in an inverted bowl shape, and the locking pin 1 is fixed in the middle of the inner side. In this embodiment, the locking pin 1 is a cylinder, and the end is round-headed. The opening structure 2, the cylinder 3, and the stroke maintaining portion 4 are all arranged on the pot body and are arranged in cooperation with the concave portion. The opening structure 2 is arranged in the shape of a frustum side wall, protrudes from the pot body, has an opening facing the locking pin 1, and the inner diameter of the opening structure 2 gradually increases along the direction away from the opening. The cylinder 3 is arranged inside the opening structure 2 and has the same opening direction as the opening structure 2, and can accommodate the locking pin 1. A limiting portion is arranged on the inner wall of the cylinder 3. The limiting portion has a locking state of limiting the locking pin 1 under the action of the stroke maintaining portion 4, and also has an unlocking state of releasing the limitation on the locking pin 1 under the action of the unlocking structure. The stroke maintaining portion 4, in this embodiment, is a spring member, sleeved on the outside of the cylinder 3, and acts on the cylinder 3 so that at least part of the cylinder 3 abuts against the inner wall of the opening structure 2.

[0057] The cylinder 3 abuts against the opening structure 2 with an inner diameter that gradually increases along the direction away from the opening, accommodates the locking pin 1 in the cylinder 3, and limits it through the limiting portion. In addition, a stroke maintaining portion 4 acting on the cylinder 3 is also provided, so that the cylinder 3 keeps abutting against the inner wall of the opening structure 2, and also makes the locking pin 1, the cylinder 3, and the limiting portion have the same stroke during the movement. Such a setting, on the one hand, avoids sudden changes in stroke, thereby destroying the locking state between the limiting portion and the locking pin 1. On the other hand, during the process of the locking pin 1 being withdrawn from the cylinder 3, the common stroke of the locking pin 1, the cylinder 3, and the limiting portion will be restricted by the inner diameter of the opening structure 2 that gradually decreases towards the opening, thereby effectively maintaining the locking state, making the device with the buckle structure unable to be opened after being stably covered, effectively reducing the gap of the covering structure, avoiding phenomena such as overflowing of the pot, improving the stability and reliability of the buckle structure, and enhancing the user experience.

[0058] In this embodiment, the limiting portion is rigidly arranged and includes a receiving hole 31 and a limiting block 32. As an alternative embodiment, the limiting portion can be a flexible member or an elastic member, and is the inner wall of the cylinder 3.

[0059] In this embodiment, a plurality of receiving holes 31 are uniformly arranged on the side wall of the cylinder 3 along the same horizontal height in the circumferential direction. The number of the receiving holes 31 is not limited and is three in this embodiment. A plurality of limiting blocks 32 are correspondingly arranged in each receiving hole 31 and protrude from the inner wall of the cylinder 3. They can move along the receiving hole 31 under the external force applied by the locking pin 1 and respectively abut against the locking pin 1 and the inner wall of the opening structure 2. As an alternative embodiment, one or more receiving holes 31 can be arranged, or they can be arranged non-uniformly on the side wall of the cylinder 3.

[0060] By setting a rigid limiting part, the stability of the limiting part is ensured, and the service life of the limiting part is effectively improved. The setting of the accommodating hole 31, on the one hand, limits the movement of the limiting block 32 to prevent it from sliding out of the cylinder 3, and on the other hand, provides a movable space for the limiting block 32. In addition, due to the setting of the stroke holding part 4, the limiting block 32 on the cylinder 3 abuts against the inner wall of the opening structure 2 under the action of the locking pin 1, forming a sliding matching surface between the locking pin 1 and the limiting block 32, and realizing synchronous movement of the stroke. In the process of the locking pin 1 leaving the cylinder 3, the friction between the locking pin 1 and the limiting block 32 is effectively combined with the resistance force component applied by the inner wall of the opening structure 2, so that the limiting block 32 and the locking pin 1 are stably locked.

[0061] The cylinder 3 is in a straight cylindrical shape, the locking pin 1 is coaxially arranged with the cylinder 3 and the opening structure 2, the angle between the locking pin 1 and the inner wall of the opening structure 2 is α, α is less than or equal to arctanμ, and μ is the friction coefficient between the locking pin 1 and the limit block 32. When the angle between the locking pin 1 and the inner wall of the opening structure 2 is α, α is less than or equal to arctanμ, the sum of the friction force between the locking pin 1 and the limit block 32 and the resistance force component applied by the inner wall of the opening structure 2 is greater than or equal to the external force applied by the locking pin 1, and the effective locking of the locking pin 1 is achieved.

[0062] In this embodiment, as a preferred implementation, the locking pin 1, the cylinder 3 and the opening structure 2 are steel structures, μ is 0.15, α is required to be less than 8.5 degrees, and the actual value range is 2.5-8.0 degrees. If α is too small, the unlocking stroke will be long and unlocking will be difficult. If α is too large, it will cause the locking to fail and fall off automatically.

[0063] In this embodiment, as a preferred implementation, the limit block 32 is a sphere. Since the limit block 32 may abut or rub against the receiving hole 31, the inner wall of the opening structure 2 and the locking pin 1 during the locking or unlocking of the lock structure, when the limit block 32 is a sphere, on the one hand, during the movement, the sliding friction is changed into rolling friction, which reduces the friction resistance, improves the flexibility of the movement of the limit block 32, and avoids problems such as friction noise. On the other hand, the setting of the sphere is that the wear parts are constantly changing during the coordination of various structures, which reduces the movement wear and improves the service life of the lock structure.

[0064] As a convertible implementation, the limiting block 32 may also be in a block shape or a column shape.

[0065] In this embodiment, the cylinder body 3 further includes a limiting end 33, which is arranged inside the opening structure 2 and abuts against the opening structure 2. The limiting end 33 is arranged in the same shape as the opening structure 2, and the accommodating hole 31 is arranged on the side wall of the limiting end 33. The locking structure further includes an inner cavity 5, and an opening structure 2 is arranged at the top end of the inner cavity 5. The cylinder body 3 and the stroke maintaining part 4 are arranged in the inner cavity 5.

[0066] In this embodiment, the stroke maintaining part 4 is an elastic spring member, which is arranged on the circumferential side of the cylinder body 3. One end of the stroke maintaining part 4 abuts against the bottom surface of the limiting end 33, and the other end abuts against the protruding part protruding towards the cylinder body 3 on the inner cavity 5.

[0067] The locking structure further includes an unlocking structure, which acts on the cylinder body 3 and is adapted to control the lifting of the cylinder body 3 so as to control the limiting part to release the limit on the locking pin 1.

[0068] In this embodiment, the unlocking structure is an integral connecting rod structure 7, which includes: a first engaging part, a second engaging part and an inclined part.

[0069] The first engaging part is arranged in a square column shape at one end of the unlocking structure and is connected with the first accommodating square groove with an elastic member on the inner cavity 5 in a matching manner; the second engaging part is arranged in a groove shape at the other end of the unlocking structure and is connected with the first fitting part protruding on the inner cavity 5 in a matching manner; the inclined part passes through the connecting hole 34 at the bottom side of the cylinder body 3, and the inner edge of the connecting hole 34 is arranged in a circular convex shape.

[0070] By setting the connecting rod structure 7 as the unlocking structure, on the one hand, through the setting of the inclined part, the lifting of the cylinder body 3 can be controlled, and further, when the limiting part is in the locked state, by further controlling the cylinder body 3 to move away from the opening structure 2, the separation of the limiting part and the locking pin 1 can be realized, and the unlocking of the locking pin 1 can be realized; on the other hand, through the setting of the first engaging part and the second engaging part, the stability of the cylinder body 3 structure during the lifting process can be ensured, and the shaking of the locking structure under the action of external force can be avoided, so that the position of the cylinder body 3 changes, resulting in the situation that the limiting part is disengaged from the locked state, and the working stability of the locking structure is improved.

[0071] The unlocking structure further includes: a switch structure 8, which is arranged adjacent to the swing rod structure 6 or the connecting rod structure 7, and includes a switch shaft connected with an elastic member. The switch shaft is adapted to move along a fixed track under the action of external force and apply pressure to the control end or the second engaging part.

[0072] In this embodiment, the buckle structure further includes a closing detection device, which is electrically connected to the profiling sleeve 21, the locking pin 1, and the limiting block 32 respectively. The profiling sleeve 21 is fitted on the inner wall of the opening structure 2. The profiling sleeve 21, the locking pin 1, and the limiting block 32 are all metal parts, specifically steel structure parts, and it can be judged whether they are closed by conductivity. As an alternative embodiment, the profiling sleeve 21, the locking pin 1, and the limiting block 32 can also be other metal parts or conductive material parts.

[0073] Embodiment 2

[0074] As Figure 2 shown, on the basis of Embodiment 1, in this embodiment, the connecting rod structure 7 is changed to a swing rod structure 6. The swing rod structure 6 can be internally provided with an elastic member, can rotate along a preset fixed axis, and complete the reset through the elastic member, or can be without an elastic member and complete the reset through the stroke maintaining portion on the cylinder body. The swing rod structure 6 further includes a connection end and a control end, and the connection end passes through the connection hole 34 provided at the bottom side of the cylinder body 3. The switch structure 8 is arranged adjacent to the connecting rod structure 7 and moves along a fixed track under an external force, applying pressure to the control end, thereby realizing the control of the movement of the swing rod structure 6, and the structure is simple and easy to implement.

[0075] As an alternative embodiment, the moving manner of the cylinder body 3 can also be in the form of gear-rack linkage or the like.

[0076] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A latch structure, characterized in that, it includes: a locking pin (1); an opening structure (2) which is provided with an opening towards the locking pin (1), and the inner diameter of the opening structure (2) gradually increases along the direction away from the opening; a cylinder body (3) which is arranged inside the opening structure (2) and abuts against the inner wall of the opening structure (2), the cylinder body (3) has the same opening direction as the opening structure (2) and is adapted to accommodate the locking pin (1), and the cylinder body (3) includes a limiting portion; and a stroke maintaining portion (4) which acts on the cylinder body (3); the limiting portion has a locking state of limiting the locking pin (1) under the action of the stroke maintaining portion (4).

2. The latch structure according to claim 1, characterized in that, the limiting portion is rigidly arranged and includes: a plurality of receiving holes (31) which are arranged on the side wall of the cylinder body (3); limiting blocks (32) which are arranged in the receiving holes (31) and protrude from the inner wall of the cylinder body (3), and are adapted to move along the receiving holes (31) under an external force and respectively abut against the locking pin (1) and the inner wall of the opening structure (2).

3. The latch structure according to claim 2, characterized in that, the receiving holes (31) are uniformly arranged circumferentially along the side wall of the cylinder body (3).

4. The latch structure according to claim 2, characterized in that, the locking pin (1) is coaxially arranged with the cylinder body (3) and the opening structure (2), and the included angle between the locking pin (1) and the inner wall of the opening structure (2) is α, and α is less than or equal to arctanμ, where μ is the friction coefficient between the locking pin (1) and the limiting block (32).

5. The latch structure according to claim 2, characterized in that, the limiting block (32) is a sphere.

6. The latch structure according to any one of claims 2 - 5, characterized in that, the cylinder body (3) includes a limiting end (33), the limiting end (33) is arranged inside the opening structure (2) and abuts against the opening structure (2), the limiting end (33) has the same shape as the opening structure (2), and the receiving holes (31) are arranged on the side wall of the limiting end (33).

7. The latch structure according to claim 6, characterized in that, it further includes a cavity (5), the opening structure (2) is arranged at the top end of the cavity (5), and the cylinder body (3) and the stroke maintaining portion (4) are arranged in the cavity (5).

8. The latch structure according to claim 7, characterized in that, the stroke maintaining portion (4) is an elastic member which is arranged on the circumference of the cylinder body (3), one end of the stroke maintaining portion (4) abuts against the bottom surface of the limiting end (33), and the other end abuts against a protruding portion on the cavity (5) which protrudes towards the cylinder body (3).

9. The latch structure according to claim 7, characterized in that, it further includes an unlocking structure which acts on the cylinder body (3) and is adapted to control the lifting of the cylinder body (3) so as to control the limiting portion to release the limitation on the locking pin (1).

10. The latch structure according to claim 9, It is characterized in that the unlocking structure includes: a swing rod structure (6), adapted to rotate along a fixed axis, including a connecting end and a control end, and the connecting end passes through a connecting hole (34) provided on the bottom side of the cylinder body (3).

11. The buckle structure according to claim 9, It is characterized in that the unlocking structure is a connecting rod structure (7), including: a first engaging portion, provided at one end of the unlocking structure, and cooperatively connected with a first receiving groove with an elastic member on the inner cavity (5); a second engaging portion, provided at the other end of the unlocking structure, and cooperatively connected with a first fitting portion protruding on the inner cavity (5); an inclined portion, passing through the connecting hole (34) on the bottom side of the cylinder body (3), and the inner edge of the connecting hole (34) is provided in a circular convex shape.

12. The buckle structure according to claim 10 or 11, It is characterized in that the unlocking structure further includes: a switch structure (8), arranged adjacent to the swing rod structure (6) or the connecting rod structure (7), including a switch shaft connected with an elastic member, and the switch shaft is adapted to move along a fixed track under an external force to apply pressure to the control end or the second engaging portion.

13. The buckle structure according to claim 12, It is characterized in that a profiling sleeve (21) is fitted on the inner wall of the opening structure (2), and the profiling sleeve (21), the locking pin (1) and the limiting block (32) are all metal parts.

14. The buckle structure according to claim 13, It is characterized in that it further includes a closing detection device, which is communicatively connected to the profiling sleeve (21), the locking pin (1) and the limiting block (32) respectively.

15. A cooking device, It is characterized in that it includes the buckle structure according to any one of claims 1-14.

16. The cooking device according to claim 15, It is characterized in that it includes: a lid body, on which there is a concave portion, the concave portion includes an opening, and the locking pin (1) extending towards the outside of the opening is built in; a pot body, on which there are provided the opening structure (2), the cylinder body (3), and the stroke maintaining portion (4), and at least a part of the opening structure (2) is adapted to be embedded in the concave portion in the locked state.

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