Opening stopping plate assembly and rotary cover opening type electric cooking appliance

By designing the stopper in the stopper plate assembly to rotate and slide in the stopper seat, the problem of wear and rust of the insulation cover teeth in the rotary open-cover electric cooker is solved, and the user experience is improved.

CN223054320UActive Publication Date: 2025-07-04SHAOXING JIBONI ELECTRO-MECHANICAL PROD CO LTD
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Patent Information

Application Number
CN202422038050.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-21
Publication Date
2025-07-04
Estimated Expiration
2034-08-21

AI Technical Summary

Technical Problem

In the existing rotary open-cover electric cooker, the powdered layer of the insulation cover teeth is easily worn due to friction, resulting in poor user experience.

Method used

A preventing plate assembly is designed, including a preventing plate, a preventing member, a preventing member and a spring. The preventing member rotates in the preventing member and slides and rotates through a rotating shaft or cam structure to reduce friction and wear.

Benefits of technology

Through the sliding and rotation of the locking member, the wear between the locking member and the insulation cover is reduced, the smoothness of the opening and closing cover is improved, and the wear and rust of the powder spray layer is avoided.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of opening stopping, in particular to an opening stopping plate assembly and a rotary cover opening type electric cooking appliance applying the same. In order to solve the technical problem that a powder spraying layer of a heat preservation cover tooth is prone to being abraded and rusted due to friction, the opening stopping plate assembly is characterized in that an opening stopping base is located on the inner side of the first end of an opening stopping plate, an opening stopping piece is arranged in the opening stopping base and can rotate in the opening stopping base, and a spring is located on the outer side of the first end of the opening stopping plate and can rotate in the opening stopping base. And the elastic force of the spring can act on the opening stopping seat. The utility model further provides a rotary cover opening type electric cooking appliance, when the cooker cover is closed on the cooker body, the opening stopping piece abuts against the heat preservation cover teeth, and the opening stopping piece can slide along the heat preservation cover teeth to loosen or lock the cooker cover when the cooker cover rotates. When the opening stopping piece is in contact with the teeth of the heat preservation cover, the opening stopping piece can slide along the teeth of the heat preservation cover and can also rotate in the opening stopping base after being stressed, so that friction movement is easier, and abrasion between the opening stopping piece and the inner teeth and the outer teeth of the heat preservation cover can be reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of anti-opening technology, in particular to an anti-opening plate assembly and a rotary cover-opening electric cooker applying the same. Background Art

[0002] At present, the pot lid anti-opening assembly applied to a rotary cover-opening electric cooker includes an anti-opening plate and an anti-opening member. The fixing surface of the anti-opening member is in frictional contact with the teeth of the heat preservation cover. The rotation of the pot lid drives the anti-opening rod to slide along the teeth of the heat preservation cover to realize opening or locking of the cover. The material of the heat preservation cover is often iron. In order to prevent the iron from rusting, powder spraying is carried out on the surface of the iron material. Frequent opening and closing of the cover will cause the surface of the teeth of the heat preservation cover that cooperates with the movement of the anti-opening member to be easily worn, resulting in rusting of the heat preservation cover and poor mutual movement between the anti-opening member and the teeth of the heat preservation cover, bringing a very bad use experience to the product. Content of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the main purpose of the utility model is to solve the technical problem that the powder spraying layer on the teeth of the heat preservation cover is easily worn due to friction and rusts.

[0004] In order to achieve the above purpose, the utility model provides an anti-opening plate assembly, which includes an anti-opening plate, an anti-opening member, an anti-opening seat and a spring; the anti-opening seat is located inside the first end of the anti-opening plate, the anti-opening member is arranged in the anti-opening seat, and the anti-opening member can rotate in the anti-opening seat; the spring is located outside the first end of the anti-opening plate, so that the elastic force of the spring can act on the anti-opening seat.

[0005] Preferably, the anti-opening plate assembly further includes a rotating shaft, and the rotating shaft is fixedly connected to the anti-opening seat; a rotating shaft hole is arranged in the vertical direction of the anti-opening member, and the rotating shaft hole is matched with the rotating shaft so that the anti-opening member can rotate around the rotating shaft.

[0006] Further preferably, the rotating shaft hole is a through hole penetrating the anti-opening member, the rotating shaft is inserted from the rotating shaft hole, and both ends of the rotating shaft extend out of the rotating shaft hole, and both ends of the rotating shaft are fixedly connected to the anti-opening seat, so that the anti-opening member can rotate around the rotating shaft.

[0007] Further preferably, an upper rotating shaft hole and a lower rotating shaft hole are respectively arranged at the upper and lower ends of the anti-opening member, and the rotating shaft includes an upper rotating shaft and a lower rotating shaft; the lower end of the upper rotating shaft is matched with the upper rotating shaft hole, and the upper end of the upper rotating shaft is fixedly connected to the anti-opening seat, so that the anti-opening member can rotate around the upper rotating shaft; the upper end of the lower rotating shaft is matched with the lower rotating shaft hole, and the lower end of the lower rotating shaft is fixedly connected to the anti-opening seat, so that the anti-opening member can rotate around the lower rotating shaft.

[0008] Preferably, the opening prevention plate assembly further includes a rivet; a first mounting hole is provided at the first end of the opening prevention plate, and a second mounting hole is provided on the opening prevention seat corresponding to the first mounting hole. The rivet passes through the second mounting hole and the first mounting hole and then extends into the spring.

[0009] Preferably, the opening prevention member is a cam.

[0010] To achieve the above object, the present invention further provides a rotary lid-opening electric cooker, including:

[0011] A pot lid, on the side wall of which a third mounting hole is provided;

[0012] A pot body, on the outer end of the side close to the pot lid of the pot body, a heat preservation cover tooth is provided. The heat preservation cover tooth includes a first inner tooth, an outer tooth and a second inner tooth. The outer tooth is located between the first inner tooth and the second inner tooth, and the diameter of the outer tooth is greater than the diameters of the first inner tooth and the second inner tooth; and

[0013] The opening prevention plate assembly according to any one of the above, the opening prevention plate is located outside the side wall of the pot lid, and the opening prevention member passes through the third mounting hole;

[0014] When the pot lid is closed on the pot body, the opening prevention member abuts against the heat preservation cover tooth, and the opening prevention member can slide along the heat preservation cover tooth when the pot lid rotates to loosen or lock the pot lid.

[0015] Preferably, the rotary lid-opening electric cooker further includes a face cover. The pot lid is located between the face cover and the pot body, the opening prevention plate is located between the face cover and the pot lid, and the free end of the spring abuts against the inner side of the side wall of the face cover.

[0016] Preferably, the rotary lid-opening electric cooker further includes an opening prevention valve, and the opening prevention valve is provided on the pot lid;

[0017] A through hole is provided on the face wall of the pot lid. A stop hole is provided at the second end of the opening prevention plate away from the first mounting hole. The second end of the opening prevention plate is located outside the face wall of the pot lid. The position of the stop hole corresponds to the position of the through hole. The opening prevention valve can vertically pass through the through hole and then lift and lower in the stop hole to loosen or lock the opening prevention plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] When the anti-opening plate assembly in the present utility model is applied to an electric cooker, when the anti-opening member contacts the teeth of the heat preservation cover, the anti-opening member will not only slide along the inner and outer teeth of the heat preservation cover but also rotate within the anti-opening seat after being stressed. Therefore, the frictional movement will be made easier, the wear between the anti-opening member and the inner and outer teeth of the heat preservation cover can be reduced, and thus the technical problem that the powder spraying layer on the teeth of the heat preservation cover is easily worn and rusted due to friction can be solved, and the feeling when opening and closing the lid will be smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic structural diagram of an embodiment of the anti-opening plate assembly of the present utility model;

[0021] Figure 2 is Figure 1 a schematic cross-sectional view of;

[0022] Figure 3 is Figure 1 a disassembled schematic diagram;

[0023] Figure 4 FIG. is a disassembled structural schematic diagram of an embodiment of a rotary lid-opening electric cooker of the present utility model;

[0024] Figure 5 FIG. is a structural schematic diagram of the contact between the anti-opening member and the teeth of the heat preservation cover in an embodiment of a rotary lid-opening electric cooker of the present utility model;

[0025] Figure 6 FIG. is a schematic diagram of the lid locking structure in an embodiment of a rotary lid-opening electric cooker of the present utility model;

[0026] Figure 7 FIG. is a schematic diagram of the lid loosening structure in an embodiment of a rotary lid-opening electric cooker of the present utility model.

[0027] The descriptions of each identifier in the figures are as follows:

[0028] 10 - anti-opening plate assembly, 11 - anti-opening plate, 111 - first mounting hole, 112 - anti-opening hole, 12 - anti-opening member,

[0029] 121 - rotating shaft hole, 13 - anti-opening seat, 131 - second mounting hole, 14 - spring, 15 - rotating shaft, 16 - rivet;

[0030] 20 - pot lid, 21 - pot lid side wall, 211 - third mounting hole, 22 - pot lid face wall, 221 - through hole;

[0031] 30 - cooker body, 31 - teeth of the heat preservation cover, 311 - first inner teeth, 312 - outer teeth, 313 - second inner teeth;

[0032] 40 - face cover;

[0033] 50 - anti-opening valve. Detailed implementation mode

[0034] The present utility model will be described in more detail below with reference to the accompanying drawings. It should be noted that the description of the present utility model with reference to the accompanying drawings below is illustrative rather than restrictive.

[0035] Where possible, the various different embodiments described below can be recombined with each other to form other embodiments not shown in the following description; the various different technical features described below can also be recombined with each other to form other embodiments not shown in the following description.

[0036] Embodiment 1

[0037] Please refer to Figure 1 , to solve the technical problem that the powder spraying layer of the heat preservation cover tooth is easily worn due to friction and rust, this embodiment provides a stop opening plate assembly 10, including a stop opening plate 11, a stop opening member 12, a stop opening seat 13 and a spring 14. The stop opening seat 13 is located inside the first end of the stop opening plate 11. The stop opening member 12 is arranged in the stop opening seat 13 and can rotate in the stop opening seat 13. The spring 14 is located outside the first end of the stop opening plate 11, so that the elastic force of the spring 11 can act on the stop opening seat 13.

[0038] Apply this stop opening plate assembly to a rotary cover type electric cooker. The rotary cover type electric cooker includes a pot cover and a pot body. A heat preservation cover tooth is arranged at the outer end of the pot body close to the pot cover. The heat preservation cover tooth includes a first inner tooth, an outer tooth and a second inner tooth. The outer tooth is located between the first inner tooth and the second inner tooth, and the diameter of the outer tooth is greater than the diameters of the first inner tooth and the second inner tooth.

[0039] When the pot cover and the pot body are in the closed state, the stop opening member abuts against the first inner tooth under the action of the spring force. Rotate the pot cover, and the stop opening plate drives the stop opening member to slide towards the outer tooth through the rotation of the pot cover. Since the diameter of the outer tooth is greater than the diameter of the first inner tooth, when the stop opening member is on the outer tooth, the spring is compressed, and the elastic force generated by the compressed spring drives the stop opening member to continue sliding towards the second inner tooth to realize the closing of the cover; when it is necessary to open the pot cover, rotate the pot cover in the reverse direction, and the stop opening plate drives the stop opening member to slide from the second inner tooth towards the outer tooth through the rotation of the pot cover. Since the diameter of the outer tooth is greater than the diameter of the second inner tooth, when the stop opening member is on the outer tooth, the spring is compressed, and the elastic force generated by the compressed spring drives the stop opening member to continue sliding towards the first inner tooth to realize the opening of the cover.

[0040] After being stressed, the stop opening member will not only slide along the inner and outer teeth of the heat preservation cover, but also rotate in the stop opening seat, which will not only make the friction movement easier, but also make different surfaces of the stop opening member contact and rub against the inner and outer teeth of the heat preservation cover. In this way, the wear between the stop opening member and the inner and outer teeth of the heat preservation cover can be reduced, and the feel during opening and closing the cover will be smoother.

[0041] The rotation of the opening prevention member within the opening prevention seat can be achieved by providing a rotating shaft within the opening prevention seat, that is: the rotating shaft is fixedly connected to the opening prevention seat, the opening prevention member is provided with a rotating shaft hole in the vertical direction, and the rotating shaft hole is engaged with the rotating shaft so that the opening prevention member can rotate around the rotating shaft. Specifically, it can be:

[0042] Please refer to Figure 2 、 Figure 3 , the rotating shaft hole 121 is a through hole penetrating the opening prevention member 12, a rotating shaft 15 is inserted through the rotating shaft hole 121, and both ends of the rotating shaft extend out of the rotating shaft hole, and both ends of the rotating shaft are fixedly connected to the opening prevention seat, so that the opening prevention member can rotate around the rotating shaft. It can also be:

[0043] Upper and lower rotating shaft holes are respectively provided at the upper and lower ends of the opening prevention member. The rotating shaft includes an upper rotating shaft and a lower rotating shaft. The lower end of the upper rotating shaft is engaged with the upper rotating shaft hole, the upper end of the upper rotating shaft is fixedly connected to the opening prevention seat, so that the opening prevention member can rotate around the upper rotating shaft. The upper end of the lower rotating shaft is engaged with the lower rotating shaft hole, and the lower end of the lower rotating shaft is fixedly connected to the opening prevention seat, so that the opening prevention member can rotate around the lower rotating shaft.

[0044] Specifically, the assembly among the opening prevention seat, the opening prevention plate, and the spring can be achieved by rivets 16. Please continue to refer to Figure 2 、 Figure 3 , a first mounting hole 111 is provided at the first end of the opening prevention plate 11. Corresponding to the first mounting hole 11, a second mounting hole 131 is provided on the opening prevention seat 13. The rivet 16 passes through the second mounting hole 131 and the first mounting hole 111 and then extends into the spring 14, thereby assembling the opening prevention seat, the opening prevention plate, and the spring together. By one rivet, the opening prevention plate, the opening prevention seat, and the spring are fixed. It is not only simple and reliable in structure, but also convenient for installation.

[0045] In a more specific embodiment, the opening prevention member is selected as a cam. The contact between the cam and the internal and external teeth of the heat preservation cover is line contact. When they slide relative to each other, compared with point contact, the contact area of friction is increased. Under the action of the same magnitude of force, the pressure borne by the surface of the internal and external teeth of the heat preservation cover is much smaller than the pressure of the point contact movement of the existing opening prevention rod, so as to further reduce the wear of the internal and external teeth of the heat preservation cover. Of course, in other specific embodiments, the opening prevention member can also be a non-line contact element such as a spherical ball, as long as the opening prevention member can rotate within the opening prevention seat, it should fall within the protection scope required by the present invention.

[0046] Embodiment 2

[0047] Please further refer to Figure 4 、 Figure 5 , in order to solve the technical problem that the powder spraying layer of the teeth of the heat preservation cover is easily worn due to friction and rust, this embodiment provides a rotary open-top electric cooker, including:

[0048] The pot lid 20 has a third mounting hole 211 provided on the side wall 21 thereof.

[0049] The pot body 30 has a heat preservation cover tooth 31 provided at the outer end of the side close to the pot lid 20. The heat preservation cover tooth includes a first inner tooth 311, an outer tooth 312, and a second inner tooth 313. The outer tooth is located between the first inner tooth and the second inner tooth, and the diameter of the outer tooth is greater than the diameters of the first inner tooth and the second inner tooth; and

[0050] Implement the stop-opening plate assembly 10 provided in the first embodiment. The stop-opening plate 11 is located outside the side wall 21 of the pot lid 20, and the stop-opening member 12 passes through the third mounting hole 211.

[0051] When the pot lid 20 is closed on the pot body 30, the stop-opening member 12 abuts against the heat preservation cover tooth 31, and the stop-opening member 12 can slide along the heat preservation cover tooth 31 when the pot lid 20 rotates to loosen or lock the pot lid.

[0052] The principle of rotating the pot lid to open and close is as follows:

[0053] When the pot lid and the pot body are in the closed state, the stop-opening member abuts against the first inner tooth under the action of the spring force. Rotate the pot lid, and the stop-opening plate drives the stop-opening member to slide towards the outer tooth through the rotation of the pot lid. Since the diameter of the outer tooth is greater than the diameter of the first inner tooth, when the stop-opening member is on the outer tooth, the spring is compressed, and the elastic force generated by the compressed spring drives the cam to continue sliding towards the second inner tooth to realize the closing of the lid; when it is necessary to open the pot lid, rotate the pot lid in the reverse direction, and the stop-opening plate drives the stop-opening member to slide from the second inner tooth towards the outer tooth through the rotation of the pot lid. Since the diameter of the outer tooth is greater than the diameter of the second inner tooth, when the stop-opening member is on the outer tooth, the spring is compressed, and the elastic force generated by the compressed spring drives the stop-opening member to continue sliding towards the first inner tooth to realize the opening of the lid.

[0054] After being stressed, the stop-opening member will not only slide along the inner and outer teeth of the heat preservation cover, but also rotate within the stop-opening seat, which will not only make the frictional movement easier, but also enable different surfaces of the stop-opening member to contact and rub against the inner and outer teeth of the heat preservation cover. In this way, the wear between the stop-opening member and the inner and outer teeth of the heat preservation cover can be reduced, and the feel during opening and closing the lid will be smoother.

[0055] In a further specific embodiment, the rotary lid-opening type electric cooker may further include a face cover 40. The pot lid 20 is located between the face cover 40 and the pot body 30, and the stop-opening plate 11 is located between the face cover 40 and the pot lid 20. The free end of the spring 14 abuts against the inner side of the side wall of the face cover, and the compression of the spring is realized through the face cover and the stop-opening plate.

[0056] Embodiment Three

[0057] Based on the second embodiment, the rotary lid-opening type electric cooker provided in this embodiment further includes a stop valve 50. Please refer further to Figure 6 、 Figure 7, the pressure relief valve is arranged on the pot cover. A through hole 221 is arranged on the surface wall 22 of the pot cover. A pressure relief hole 112 is arranged at the second end of the pressure relief plate away from the first mounting hole 111. The second end of the pressure relief plate is located outside the surface wall 22 of the pot cover. The position of the pressure relief hole 112 corresponds to the position of the through hole 221. The pressure relief valve 50 can lift up and down in the pressure relief hole after passing through the through hole in the vertical direction to loosen or lock the pressure relief plate.

[0058] After the pressure in the pot body rises, the pressure relief valve will be forced upward and rise into the pressure relief hole of the pressure relief plate. The pressure relief plate is blocked by the rising pressure relief valve and cannot move, resulting in the pressure relief component being unable to generate a radial displacement when the user rotates the pot cover. Since the diameter of the external teeth is greater than the diameter of the first internal teeth, the pressure relief component will be blocked by the external teeth and cannot slide from the first internal teeth towards the external teeth, and the pot cover cannot rotate, ensuring that the pot cover cannot be opened when there is pressure in the pot body, thus ensuring the safety of the user; when there is no pressure in the pot body assembly, the pressure relief valve drops outside the pressure relief hole under the action of gravity, and the pressure relief plate is not blocked by the pressure relief valve. The pressure relief component can generate a radial displacement under the action of the user rotating the pot cover. At this time, if the cover is in the open state, rotate the pot cover, and the pressure relief plate drives the pressure relief component to slide from the first internal teeth towards the external teeth through the rotation of the pot cover. Since the diameter of the external teeth is greater than the diameter of the first internal teeth, when the pressure relief component is on the external teeth, the spring is compressed, and the elastic force generated by the compressed spring drives the cam to continue sliding towards the second internal teeth to realize the closing of the cover; at this time, if the cover is in the closed state, rotate the pot cover in the reverse direction, and the pressure relief plate drives the pressure relief component to slide from the second internal teeth towards the external teeth through the rotation of the pot cover. Since the diameter of the external teeth is greater than the diameter of the second internal teeth, when the pressure relief component is on the external teeth, the spring is compressed, and the elastic force generated by the compressed spring drives the cam to continue sliding towards the first internal teeth to realize the opening of the cover.

[0059] Although multiple specific embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are merely exemplary and should not be construed as limiting the protection scope of the present invention. Any non-substantial changes and substitutions made by those of ordinary skill in the art belong to the scope of protection required by the present invention.

Claims

1. An anti-opening plate assembly, characterized in that, It includes a lid-opening prevention plate, a lid-opening prevention member, a lid-opening prevention seat, and a spring; the lid-opening prevention seat is located inside the first end of the lid-opening prevention plate, the lid-opening prevention member is arranged in the lid-opening prevention seat, and the lid-opening prevention member can rotate in the lid-opening prevention seat; the spring is located outside the first end of the lid-opening prevention plate, so that the elastic force of the spring can act on the lid-opening prevention seat.

2. The anti-opening plate assembly according to claim 1, characterized in that, It further includes a rotating shaft, and the rotating shaft is fixedly connected to the lid-opening prevention seat; a rotating shaft hole is arranged in the vertical direction of the lid-opening prevention member, and the rotating shaft hole cooperates with the rotating shaft so that the lid-opening prevention member can rotate around the rotating shaft.

3. The anti-opening plate assembly according to claim 2, wherein The rotating shaft hole is a through hole penetrating the lid-opening prevention member, the rotating shaft is inserted from the rotating shaft hole, and both ends of the rotating shaft extend out of the rotating shaft hole, and both ends of the rotating shaft are fixedly connected to the lid-opening prevention seat, so that the lid-opening prevention member can rotate around the rotating shaft.

4. The anti-opening plate assembly according to claim 2, characterized in that, Upper and lower rotating shaft holes are respectively arranged at the upper and lower ends of the lid-opening prevention member, and the rotating shaft includes an upper rotating shaft and a lower rotating shaft; the lower end of the upper rotating shaft cooperates with the upper rotating shaft hole, and the upper end of the upper rotating shaft is fixedly connected to the lid-opening prevention seat, so that the lid-opening prevention member can rotate around the upper rotating shaft; the upper end of the lower rotating shaft cooperates with the lower rotating shaft hole, and the lower end of the lower rotating shaft is fixedly connected to the lid-opening prevention seat, so that the lid-opening prevention member can rotate around the lower rotating shaft.

5. The anti-opening plate assembly according to any one of claims 1 to 4, characterized in that It further includes a rivet; a first installation hole is arranged at the first end of the lid-opening prevention plate, corresponding to the first installation hole, a second installation hole is arranged on the lid-opening prevention seat, and the rivet passes through the second installation hole and the first installation hole and then extends into the spring.

6. The anti-opening plate assembly according to claim 1, characterized in that, The lid-opening prevention member is a cam.

7. A rotary lid-opening electric cooker, characterized in that, It includes: A pot lid, and a third installation hole is arranged on the side wall of the pot lid; A pot body, and a heat preservation cover tooth is arranged at the outer end of the pot body close to the pot lid side. The heat preservation cover tooth includes a first inner tooth, an outer tooth, and a second inner tooth. The outer tooth is located between the first inner tooth and the second inner tooth, and the diameter of the outer tooth is larger than the diameters of the first inner tooth and the second inner tooth; And The lid-opening prevention plate assembly according to any one of claims 1 to 4 and 6, the lid-opening prevention plate is located outside the side wall of the pot lid, and the lid-opening prevention member passes through the third installation hole; When the pot lid is closed on the pot body, the lid-opening prevention member abuts against the heat preservation cover tooth, and the lid-opening prevention member can slide along the heat preservation cover tooth when the pot lid rotates to loosen or lock the pot lid.

8. The rotary open-cover type electric cooker according to claim 7, wherein It further includes a face cover. The pot lid is located between the face cover and the pot body, the lid-opening prevention plate is located between the face cover and the pot lid, and the free end of the spring abuts against the inner side of the side wall of the face cover.

9. The rotary lid-opening electric cooker according to any one of claims 7 or 8, characterized in that It further includes a lid-opening prevention valve and a rivet, and the lid-opening prevention valve is arranged on the pot lid; A first installation hole is arranged at the first end of the lid-opening prevention plate, corresponding to the first installation hole, a second installation hole is arranged on the lid-opening prevention seat, and the rivet passes through the second installation hole and the first installation hole and then extends into the spring; A through hole is provided on the wall surface of the pot lid. A stop opening hole is provided at the second end of the stop opening plate away from the first mounting hole. The second end of the stop opening plate is located outside the wall surface of the pot lid. The position of the stop opening hole corresponds to the position of the through hole. The stop valve can vertically pass through the through hole and then lift and lower in the stop opening hole to loosen or lock the stop opening plate.