Kitchen appliance with cover opening protection mechanism

Abstract

The present invention provides a kitchen appliance with a lid-opening protection mechanism, comprising a base, a cover rotatably disposed on the base, and a lid-opening protection mechanism disposed on the base. The lid-opening protection mechanism comprises a frame, a microswitch, and a trigger rod, and the operation of the kitchen appliance is suspended when the on / off state of the microswitch changes. A water collection box is provided in the middle of the trigger rod, a collection port surrounding the trigger rod is provided in the upper portion of the water collection box, and a discharge port is provided on one side of the water collection box. By providing the water collection box, the present invention can prevent solid and liquid substances from entering the interior of the lid-opening protection mechanism, thereby improving the reliability and durability of the lid-opening protection mechanism, preventing users from electric shock, and protecting the user's safety. The present invention also improves the accuracy of the mechanical transmission in the lid-opening protection mechanism by providing a mutually cooperating locking mechanism between the trigger rod and the telescopic tube, so that the lid-opening protection mechanism can be stably triggered.

Description

Technical Field

[0001] The invention relates to a kitchen appliance with a cover opening protection mechanism. Background Art

[0002] During cooking, the internal temperature of a kitchen appliance is often high due to the sealing effect of the lid and the continuous heating of the heating element. If the user opens the lid without pausing the appliance, food residue, grease, and moisture can easily splash out as the heating element continues to operate, creating a risk of burns. Therefore, it is very important for a kitchen appliance to automatically pause when the lid is opened to prevent burns.

[0003] Existing lid-opening protection mechanisms typically use a mechanical transmission coupled with electronic control to convert the mechanical motion of opening the lid into an electrical signal that can pause the operation of the kitchen appliance. However, the applicant's research has found that water and food debris that enter the lid-opening protection mechanism during cooking can cause the lid-opening protection mechanism to malfunction. Food debris can enter the mechanical transmission mechanism, blocking its transmission, while water can intrude into the electronic control device, causing a short circuit. Water that enters the lid-opening protection mechanism can also easily flow into the interior of the kitchen appliance, damaging other electronic components. This not only shortens the lifespan of the appliance but also poses a risk of electric shock to the user. Furthermore, the mechanical transmission mechanism is prone to aging and high-temperature deformation over long-term use, which can reduce its motion accuracy and prevent the lid-opening protection mechanism from being reliably triggered. Therefore, existing lid-opening protection mechanisms lack reliability and, after long-term use, can easily cause the kitchen appliance to not pause or pause with delay after the lid is opened, failing to provide effective safety protection for the user. Summary of the Invention

[0004] In view of this, the present invention provides a kitchen appliance with a lid-opening protection mechanism that can prevent solid and liquid substances from entering the interior of the lid-opening protection mechanism, thereby improving the reliability and durability of the lid-opening protection mechanism, preventing users from electric shock, and ensuring user safety. The present invention also improves the accuracy of the mechanical transmission in the lid-opening protection mechanism, ensuring that the lid-opening protection mechanism can be triggered stably.

[0005] The present invention provides a kitchen appliance with a cover-opening protection mechanism, comprising a base, a cover rotatably arranged on the base, and a cover-opening protection mechanism arranged on the base;

[0006] The cover opening protection mechanism comprises:

[0007] - a frame, fixedly disposed inside the base and close to the connection between the cover and the base;

[0008] - a micro switch, disposed inside the frame, capable of pausing the operation of the kitchen appliance when its on / off state changes; and

[0009] - a trigger rod, telescopically disposed on the frame, with its upper end extending above the base to contact the cover, and its lower end interacting with the micro switch to change the on / off state of the micro switch;

[0010] A water collecting box is provided in the middle of the trigger rod, a collecting port surrounding the trigger rod is provided on the upper part of the water collecting box, and a discharge port is provided on one side of the water collecting box.

[0011] Preferably, a drainage channel is provided on the side wall of the base close to the discharge port, and the water inlet end of the drainage channel is connected to the lower side of the water outlet end of the discharge port.

[0012] Preferably, the bottom surface of the water collecting box is inclined downward toward the discharge port, and the base further comprises:

[0013] a first water retaining wall, blocking the edge of the water inlet end of the drainage channel and being parallel to the side wall of the base where the drainage channel is opened; and

[0014] a second water retaining wall, blocking the edge of the water inlet end of the drainage channel and located at both ends of the first water retaining wall;

[0015] The projection of the water outlet end of the discharge port in the vertical direction falls on the side of the first water retaining wall away from the trigger rod and is located between the two second water retaining walls.

[0016] Preferably, the height of the first water retaining wall is smaller than that of the second water retaining wall, and the water outlet end of the discharge port is located between the top of the first water retaining wall and the top of the second water retaining wall when the trigger rod is in a retracted state.

[0017] Preferably, the micro switch is arranged adjacent to the trigger rod, and the micro switch further comprises:

[0018] an elastic button, arranged on a side of the micro switch close to the trigger rod, capable of changing the on / off state of the micro switch when squeezed;

[0019] A first inclined surface is provided on a side of the lower end of the trigger rod facing the elastic button, and the first inclined surface can press the elastic button when the telescopic state of the trigger rod changes.

[0020] Preferably, the frame is provided with a telescopic tube, the trigger rod is telescopically arranged inside the telescopic tube, the telescopic tube is further provided with a guide groove extending along the telescopic direction of the trigger rod, and the trigger rod is further provided with a clamping rib extending outward and capable of being clamped inside the guide groove.

[0021] Preferably, the inner diameter of at least the portion of the telescopic tube located above the guide groove is smaller than the outer diameter of the clamping rib, and a second inclined surface is further provided on the inner wall of the telescopic tube directly above the guide groove, and the second inclined surface causes the inner diameter of the telescopic tube to gradually increase from top to bottom. The lower surface of the clamping rib is further provided with a third inclined surface, and the third inclined surface causes the thickness of the clamping rib to gradually decrease from inside to outside.

[0022] Preferably, the trigger rod is further provided with a step structure protruding outward, the outer wall of the step structure is a guide surface, the guide surface cooperates with the inner wall of the telescopic tube, the inner wall of the telescopic tube is further provided with a positioning rib, and the outer wall of the step structure is provided with a positioning groove, the positioning groove cooperates with the positioning rib; the upper end of the telescopic tube is further provided with an anti-fool groove extending along the telescopic direction of the trigger rod, and the trigger rod is further provided with an anti-fool flange protruding outward, and the anti-fool flange can be embedded and installed inside the anti-fool groove.

[0023] Preferably, the kitchen appliance further comprises:

[0024] The spring has two ends connected to the frame and the trigger rod respectively, and can make the trigger rod have a movement tendency of extending upward relative to the frame in a compressed state.

[0025] Therefore, by providing a water collection box on the trigger rod, the present invention can prevent solid and liquid substances from entering the interior of the cover opening protection mechanism along the trigger rod, thereby improving the reliability and durability of the cover opening protection mechanism, preventing users from electric shock, and ensuring user safety. In addition, by providing mutually coordinated guiding structures such as guide grooves and retaining ribs, positioning ribs and positioning grooves, and foolproof grooves and foolproof flanges, the present invention improves the accuracy of the trigger rod's telescopic movement relative to the telescopic tube, thereby ensuring more stable triggering of the microswitch. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application, but do not constitute a limitation on the technical solution of the present application.

[0027] Figure 1 It is a schematic cross-sectional view of a portion of the cover opening protection mechanism of a kitchen appliance according to the present invention;

[0028] Figure 2 It is a schematic structural diagram of the drainage channel on the base of the kitchen appliance of the present invention;

[0029] Figure 3 Schematic diagram of the cross-sectional structure of the cover opening protection mechanism of the present invention;

[0030] Figure 4The cover opening protection mechanism of the present invention is perpendicular to Figure 3 Schematic diagram of the cross-sectional structure from the perspective of ;

[0031] Figure 5 It is a schematic cross-sectional structural diagram of a portion of the drainage channel of the cover opening protection mechanism of the present invention when the trigger rod is in the extended state;

[0032] Figure 6 It is a schematic cross-sectional structural diagram of a portion of the drainage channel of the cover opening protection mechanism of the present invention when the trigger rod is in a retracted state;

[0033] Figure 7 Schematic diagram of the structure of the trigger rod in the cover opening protection mechanism of the present invention;

[0034] Figure 8 Schematic diagram of the cross-sectional structure of the trigger rod in the cover opening protection mechanism of the present invention;

[0035] Figure 9 Schematic diagram of the structure of the frame in the cover opening protection mechanism of the present invention;

[0036] Figure 10 It is a schematic cross-sectional structure diagram of the frame in the cover opening protection mechanism of the present invention.

[0037] Description of reference numerals:

[0038] 1-base; 11-drainage channel; 12-first water retaining wall; 13-second water retaining wall; 2-cover; 3-cover opening protection mechanism; 31-frame; 311-telescopic tube; 311a-guide groove; 311b-second inclined plane; 311c-positioning rib; 311d-anti-fouling groove; 32-micro switch; 321-elastic button; 33-touch rod; 331-first inclined plane; 332-clamping rib; 332a-third inclined plane; 333-step structure; 333a-guide surface; 333b-positioning groove; 334-anti-fouling flange; 34-water collection box; 341-collection port; 342-discharge port; 35-spring. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0040] like Figure 1-10As shown, in one aspect of the present invention, a kitchen appliance with a lid opening protection mechanism 3 is provided, comprising a base 1, a cover 2 rotatably disposed on the base 1, and the lid opening protection mechanism 3 disposed on the base 1.

[0041] The lid-opening protection mechanism 3 uses the opening of the lid 2 relative to the base 1 to control the suspension of the kitchen appliance. It comprises a frame 31, a microswitch 32 mounted within the frame 31, and a trigger rod 33 retractably mounted on the frame 31. The frame 31 is fixedly mounted within the base 1, near the connection between the lid 2 and the base 1. The frame 31 serves as the intermediate support structure for attaching the microswitch 32 and trigger rod 33 to the base 1. The frame 31 also provides guidance for the trigger rod 33: the upper end of the trigger rod 33 extends above the base 1 to contact the lid 2, while the lower end interacts with the microswitch 32 to change its on / off state. Thus, the trigger rod 33 converts the opening and closing of the lid 2 into a change in the on / off state of the microswitch 32, thereby causing the kitchen appliance to stop operating accordingly.

[0042] It can be seen that the lid opening protection mechanism 3 mainly controls the kitchen appliance by mechanical transmission of the trigger rod 33 and electronic control of the micro switch 32. During operation, the kitchen appliance generates a large amount of water vapor and splashes soup, oil droplets and food residues. These liquid or solid impurities can easily flow downward along the trigger rod 33 to the micro switch 32, affecting the normal operation of the micro switch 32.

[0043] In this regard, according to the attached Figure 2-6 The impurity discharge process of the present invention is described in detail. A water collection box 34 is provided in the middle of the trigger rod 33. A collection port 341 is provided above the water collection box 34, surrounding the trigger rod 33, to collect liquid or solid impurities that flow downward along the trigger rod 33. A discharge port 342 is also provided on one side of the water collection box 34, which promptly discharges impurities collected by the water collection box 34 out of the lid protection mechanism 3. This prevents the water collection box 34 from losing its ability to collect materials due to its internal space being full, allowing the water collection box 34 to continue functioning and protecting the microswitch 32 from the effects of liquid or solid impurities.

[0044] However, simply discharging impurities from the cover protection mechanism 3 cannot effectively protect other electronic components in the kitchen appliance from the influence of impurities. Therefore, the present invention further guides the impurities discharged from the discharge port 342 out of the base 1 by providing a drainage channel 11 on the side wall of the base 1 near the discharge port 342.

[0045] Considering that the water collecting box 34 will move up and down with the extension and retraction of the trigger rod 33, the water inlet end of the drainage channel 11 is connected below the water outlet end of the discharge port 342. At this time, no matter what the height of the discharge port 342 is, the material flowing out from the water outlet end of the discharge port 342 will fall into the water inlet end of the drainage channel 11 under the action of gravity.

[0046] Furthermore, the types and proportions of liquid and solid matter in the impurities collected by the water collection box 34 vary depending on the type of food cooked by the kitchen appliance. When the impurities are highly viscous and have poor fluidity, the speed at which the impurities flow from the water collection box 34 to the drainage channel 11 will also slow down. For the water collection box 34, when the outflow rate of impurities at the discharge port 342 is lower than the inflow rate at the collection port 341, impurities will accumulate in the water collection box 34, reducing the collection efficiency and protective effect of the water collection box 34. To address this issue, the bottom surface of the water collection box 34 in the present invention is tilted downward toward the discharge port 342, so that impurities in the water collection box 34 can flow smoothly from the water collection box 34 to the drainage channel 11 due to the action of the tilted bottom surface.

[0047] Due to the height difference between the water collection box 34 and the drainage channel 11, impurities that fall into the drainage channel 11 are easily splashed out due to the speed of their fall, affecting the electronic components in the kitchen appliance. To address this issue, the present invention provides a first water retaining wall 12 and a second water retaining wall 13 at the edge of the water inlet end of the drainage channel 11 to prevent impurities from splashing outward. The first water retaining wall 12 is parallel to the side wall of the base 1 that defines the drainage channel 11, and the second water retaining walls 13 are provided at both ends of the first water retaining wall 12. Preferably, one first water retaining wall 12 and two second water retaining walls 13 are arranged in a U-shape around the edge of the water inlet end of the drainage channel 11.

[0048] Based on this structure, the projection of the water outlet end of the discharge port 342 in the vertical direction falls on the side of the first water retaining wall 12 away from the trigger rod 33 and is located between the two second water retaining walls 13, that is, the water outlet end of the discharge port 342 falls inside the U-shaped enclosing structure, so that the splashing impurities can be blocked by the first water retaining wall 12 and the second water retaining wall 13.

[0049] Taking into account that a large amount of impurities enter the lid opening protection mechanism 3 when the kitchen appliance is in the cooking state, in a preferred embodiment, the height of the first water retaining wall 12 is less than the height of the second water retaining wall 13, and when the trigger rod 33 is in the retracted state, the water outlet end of the discharge port 342 is located between the top of the first water retaining wall 12 and the top of the second water retaining wall 13, so that the water outlet end of the discharge port 342 is blocked by the two second water retaining walls 13 in its own width direction, further preventing impurities from splashing outside the water inlet end of the discharge channel.

[0050] The following is based on the attached Figure 3The interaction between the trigger rod 33 and the microswitch 32 is described in detail. The microswitch 32 of the present invention is positioned adjacent to the trigger rod 33 and includes a resilient button 321 on a side proximal to the trigger rod 33. A first inclined surface 331 is provided on the lower end of the trigger rod 33, facing the resilient button 321. This first inclined surface 331 compresses the resilient button 321 when the trigger rod 33 retracts downward, thereby changing the on / off state of the microswitch 32 through the resilient button 321 and thereby suspending the operation of the kitchen appliance.

[0051] The microswitch 32 is positioned adjacent to the trigger rod 33, making the cover-opening protection mechanism 3 more compact in height and more compact. The first inclined surface 331 redirects the longitudinal extension and retraction motion of the trigger rod 33 into a lateral squeezing motion of the trigger rod 33 against the elastic button 321. Those skilled in the art will appreciate that by varying the slope of the first inclined surface 331, the amplitude of the squeezing motion of the trigger rod 33 against the elastic button 321 can be adjusted to achieve the desired compression level sufficient to trigger the microswitch 32 to switch the microswitch 32 on and off.

[0052] Since the trigger rod 33 is prone to aging and high temperature deformation during long-term use, the accuracy of the telescopic movement of the trigger rod 33 relative to the frame 31 will be reduced, resulting in the inability to stably trigger the cover opening protection mechanism 3. Figure 3-10 The guiding function between the trigger rod 33 and the structure cooperating therewith will be described in detail.

[0053] To guide the telescopic tube 311, the frame 31 is provided with the telescopic tube 311, and the trigger rod 33 is telescopically disposed within the telescopic tube 311. Furthermore, the telescopic tube 311 is provided with a guide groove 311a extending in the direction of extension and contraction of the trigger rod 33. The trigger rod 33 is also provided with a retaining rib 332 extending outward and retaining within the guide groove 311a. The retaining rib 332 is restrained by the guide groove 311a, thereby limiting the circumferential position of the trigger rod 33 relative to the telescopic tube 311.

[0054] In a preferred embodiment, to limit the axial position of the trip rod 33 relative to the telescopic tube 311, the inner diameter of at least the portion of the telescopic tube 311 located above the guide slot 311a is smaller than the outer diameter of the retaining rib 332. Consequently, when the retaining rib 332 moves to the uppermost end of the guide slot 311a as the trip rod 33 extends, the upward movement of the trip rod 33 is correspondingly limited, preventing the trip rod 33 from dislodging from the telescopic tube 311.

[0055] However, the inner diameter of the telescopic tube 311 above the guide groove 311a is smaller than the outer diameter of the retaining rib 332, which prevents the trigger rod 33 from being assembled from the upper end into the interior of the telescopic tube 311. To address this, a second inclined surface 311b is provided on the inner wall of the telescopic tube 311, located directly above the guide groove 311a, and a third inclined surface 332a is provided on the lower surface of the retaining rib 332. The second inclined surface 311b gradually increases the inner diameter of the telescopic tube 311 from top to bottom, while the third inclined surface 332a gradually decreases the thickness of the retaining rib 332 from inside to outside. The interaction between the second inclined surface 311b and the third inclined surface 332a increases the distance between the retaining rib 332 and the inner wall of the telescopic tube 311, allowing the trigger rod 33 to be easily assembled to the position where the retaining rib 332 is located below the second inclined surface 311b. At this time, by continuing to press down the trigger rod 33, the clamping rib 332 and the inner wall of the telescopic tube 311 are deformed to a certain extent, and the trigger rod 33 can be easily installed inside the telescopic tube 311, and the clamping rib 332 can be clamped inside the guide groove 311a.

[0056] In a preferred embodiment, the trigger rod 33 further includes an outwardly protruding step structure 333. The outer wall of the step structure 333 serves as a guide surface 333a, which mates with the inner wall of the telescopic tube 311. The inner wall of the telescopic tube 311 also includes a positioning rib 311c, and the outer wall of the step structure 333 also includes a positioning groove 333b, which mates with the positioning rib 311c. The interplay of the guide surface 333a with the inner wall of the telescopic tube 311, and the positioning groove 333b with the positioning rib 311c, effectively improves the precision of the telescopic movement of the trigger rod 33 relative to the telescopic tube 311, thereby enabling the trigger rod 33 to more effectively trigger the microswitch 32.

[0057] To facilitate operator positioning and installation, the upper end of the telescopic tube 311 is provided with a foolproof groove 311d extending along the extension and retraction direction of the trigger rod 33. The trigger rod 33 also features an outwardly protruding foolproof flange 334, which fits snugly within the foolproof groove 311d. Operators simply align the foolproof flange 334 with the foolproof groove 311d to easily ensure the desired installation angle of the trigger rod 33 relative to the telescopic tube 311. The foolproof design of the foolproof flange 334 and the foolproof groove 311d prevents the operator from inserting the trigger rod 33 into the telescopic tube 311 at any angle other than the specified one. This design allows operators to accurately and directly perform the correct operation without requiring additional attention, experience, or specialized training, thereby reducing assembly complexity and improving production efficiency.

[0058] However, the multiple structural coordination relationships, including the retaining rib 332 and the guide groove 311a, the guide surface 333a and the inner wall of the telescopic tube 311, and the positioning groove 333b and the positioning rib 311c, will still cause a certain resistance to the extension process of the trigger rod 33 relative to the telescopic tube 311. Therefore, the present invention provides a spring 35 between the frame 31 and the trigger rod 33, and the spring 35, when compressed, causes the trigger rod 33 to have a tendency to extend upward relative to the frame 31, thereby ensuring that the trigger rod 33 can be smoothly extended when there is no obstruction from the cover 2.

[0059] In another aspect of the present invention, a kitchen appliance is provided, comprising the lid opening protection mechanism 3 according to any one of the aforementioned embodiments.

[0060] In summary, the present invention, by providing a water collection box 34 on the trigger rod 33, can prevent solid and liquid substances from entering the interior of the lid opening protection mechanism 3 along the trigger rod 33, thereby improving the reliability and durability of the lid opening protection mechanism 3, preventing users from electric shock, and ensuring user safety. Furthermore, by providing mutually cooperating guide structures such as the guide groove 311a and the retaining rib 332, the positioning rib 311c and the positioning groove 333b, and the foolproof groove 311d and the foolproof flange 334, the present invention improves the precision of the telescopic movement of the trigger rod 33 relative to the telescopic tube 311, thereby ensuring more stable triggering of the microswitch 32.

[0061] Thus far, some specific embodiments of the present invention have been described in detail by way of examples. However, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A kitchen appliance with a cover opening protection mechanism, characterized in that: It comprises a base (1), a cover (2) rotatably arranged on the base (1), and a cover opening protection mechanism (3) arranged on the base (1); The cover opening protection mechanism (3) comprises: - a frame (31), fixedly arranged inside the base (1) and close to the connection position between the cover (2) and the base (1); - a micro switch (32), which is arranged inside the frame (31) and can suspend the operation of the kitchen appliance when the on / off state changes; and - a trigger rod (33), which is telescopically arranged on the frame (31), with its upper end extending above the base (1) to contact the cover (2), and its lower end interacting with the micro switch (32) to change the on / off state of the micro switch (32); A water collecting box (34) is provided in the middle of the trigger rod (33), a collecting port (341) surrounding the trigger rod (33) is provided on the upper portion of the water collecting box (34), and a discharge port (342) is provided on the side of the water collecting box (34).

2. The kitchen appliance according to claim 1, characterized in that: The base (1) is provided with a drainage channel (11) on a side wall close to the discharge port (342), and the water inlet end of the drainage channel (11) is connected to the lower side of the water outlet end of the discharge port (342).

3. The kitchen appliance according to claim 2, characterized in that: The bottom surface of the water collecting box (34) is inclined downwardly toward the discharge port (342), and the base (1) further comprises: A first water retaining wall (12) blocks the edge of the water inlet end of the drainage channel (11) and is parallel to the side wall of the base (1) on which the drainage channel (11) is opened; and A second water retaining wall (13) blocks the edge of the water inlet end of the drainage channel (11) and is located at both ends of the first water retaining wall (12); The projection of the water outlet end of the discharge port (342) in the vertical direction falls on the side of the first water retaining wall (12) away from the trigger rod (33) and is located between the two second water retaining walls (13).

4. The kitchen appliance according to claim 3, characterized in that: The height of the first water retaining wall (12) is smaller than the height of the second water retaining wall (13), and the water outlet end of the discharge port (342) is located between the top of the first water retaining wall (12) and the top of the second water retaining wall (13) when the trigger rod (33) is in a retracted state.

5. The kitchen appliance according to claim 1, characterized in that The micro switch (32) is arranged adjacent to the trigger rod (33), and the micro switch (32) further includes: an elastic button (321), arranged on a side of the micro switch (32) close to the trigger rod (33), capable of changing the on / off state of the micro switch (32) when squeezed; A first inclined surface (331) is provided on the side of the lower end of the trigger rod (33) facing the elastic button (321), and the first inclined surface (331) can press the elastic button (321) when the telescopic state of the trigger rod (33) changes.

6. The kitchen appliance according to claim 1, characterized in that The frame (31) is provided with a telescopic tube (311), the trigger rod (33) is telescopically arranged inside the telescopic tube (311), the telescopic tube (311) is further provided with a guide groove (311a) extending along the telescopic direction of the trigger rod (33), and the trigger rod (33) is further provided with a clamping rib (332) extending outward and capable of being clamped inside the guide groove (311a).

7. The kitchen appliance according to claim 6, characterized in that: The inner diameter of at least a portion of the telescopic tube (311) above the guide groove (311a) is smaller than the outer diameter of the clamping rib (332); a second inclined surface (311b) located directly above the guide groove (311a) is further provided on the inner wall of the telescopic tube (311); the second inclined surface (311b) causes the inner diameter of the telescopic tube (311) to gradually increase from top to bottom; a third inclined surface (332a) is further provided on the lower surface of the clamping rib (332); the third inclined surface (332a) causes the thickness of the clamping rib (332) to gradually decrease from inside to outside.

8. The kitchen appliance according to claim 6, characterized in that: The trigger rod (33) is further provided with a step structure (333) protruding outward, the outer wall of the step structure (333) is a guide surface (333a), the guide surface (333a) cooperates with the inner wall of the telescopic tube (311), the inner wall of the telescopic tube (311) is further provided with a positioning rib (311c), the outer wall of the step structure (333) is provided with a positioning groove (333b), the positioning groove (333b) cooperates with the positioning rib (311c); the upper end of the telescopic tube (311) is further provided with an anti-fool groove (311d) extending along the telescopic direction of the trigger rod (33), the trigger rod (33) is further provided with an anti-fool flange (334) protruding outward, the anti-fool flange (334) can be embedded and installed inside the anti-fool groove (311d).

9. The kitchen appliance according to claim 1, characterized in that: The cover opening protection mechanism (3) further comprises: The spring (35) has two ends connected to the frame (31) and the trigger rod (33) respectively, and can make the trigger rod (33) have a tendency to extend upward relative to the frame (31) in a compressed state.

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