Mixing device
By designing an automated mixing device and using first and second forces to control state switching, automated mixing of solid powder and liquid is achieved, solving the problems of cumbersome operation and safety risks, and is suitable for fine mixing scenarios.
Patent Information
- Application Number
- CN202422842658.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-21
AI Technical Summary
Existing mixing devices are cumbersome to operate and pose a risk of chemical harm during the mixing of solid powders and liquids. Current technologies rely on manual mixing, which lacks convenience and safety.
Design a mixing device comprising a first container and a second container, achieving state switching by applying first and second forces, automating the mixing and aeration of substances, and avoiding human contact with chemical agents.
It enables automated mixing of substances, avoiding cumbersome operations and the risk of harm from chemical agents. It is suitable for fine mixing scenarios and improves operational convenience and safety.
Smart Images
Figure CN223490768U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mixing container technology, and in particular to a mixing device that is applicable to mixing two powders, mixing powder and liquid, and mixing liquid and liquid. Background Technology
[0002] In the field of existing mixing equipment, especially in the process of mixing solid powders and liquids, traditional methods mainly rely on manual mixing by operators. Operators need to manually weigh the solid powders and liquids based on experience and requirements, and then mix them. However, this method has many drawbacks, such as being cumbersome. Furthermore, if operators handle chemicals improperly, they may face the risk of chemical injury, posing a threat to their health. Utility Model Content
[0003] This utility model provides a mixing device to solve the problems in the prior art.
[0004] The technical solution adopted in this embodiment of the utility model is as follows:
[0005] A mixing device includes: a first container for holding a first substance; and a second container located at the open end of the first container, with a seal at its bottom to form a cavity for holding a second substance. The mixing device has a first state and a second state. In the first state, the second container closes the open end of the first container to enclose the first substance within the first container, while the second substance is enclosed within the cavity of the second container. In the second state, the second container releases the seal on the open end of the first container, connecting the interior of the first container to the external atmosphere, and the seal on the second container is released, releasing the second substance from the second container into the first container. In the first state, the mixing device is subjected to a first force and a second force to switch from the first state to the second state. After the mixing device is subjected to the first force, the second container releases the seal on the open end of the first container, connecting the interior of the first container to the external atmosphere. After the mixing device is subjected to the second force, the seal on the second container is released, releasing the second substance from the second container into the first container.
[0006] Preferably, under the action of the first force, the second container moves relative to the first container in a direction perpendicular or substantially perpendicular to the bottom surface of the first container, so as to release the closure of the opening end of the first container.
[0007] Preferably, under the action of the second force, the second container rotates relative to the first container about its axis to release the closure of the second container.
[0008] Preferably, the sealing element is rotatably connected to the open end of the second container; the first container is provided with a limiting part adapted to the sealing element, and when the second container rotates relative to the first container around its axis under the action of a second force, the limiting part forces the sealing element to rotate relative to the second container, so that the sealing element disengages from the second container.
[0009] Preferably, the second container is configured as a cylindrical shape with one end open, and a plurality of limiting ribs are evenly distributed on the side wall of the open end; the sealing element is configured as a cover, and a plurality of limiting grooves are provided on it to match the limiting ribs so as to realize the connection between the sealing element and the second container; the sealing element rotates relative to the second container, so that the limiting ribs slide out from the limiting grooves and the sealing element detaches from the second container.
[0010] Preferably, the second container is provided with a sealing gasket; in the first state, the sealing gasket abuts against the first container to close the opening end of the first container; in the second state, the sealing gasket disengages from the first container, releasing the closure of the opening end of the first container.
[0011] Preferably, in the second state, after the second container is subjected to the third force, the second container closes the opening of the first container again to isolate the interior of the first container from the external atmosphere.
[0012] Preferably, the mixing device further includes: a ventilation cover mounted on the first container; a pressing member having a button portion and a connecting portion disposed on the button portion, the free end of the connecting portion passing through the ventilation cover and connected to the second container; the pressing member is movable relative to the ventilation cover from an initial position to a pressing position, in the initial position, the mixing device is in a first state; in the pressing position, the pressing member causes the second container to release the seal on the opening end of the first container, realizing communication between the inside of the first container and the outside atmosphere.
[0013] Preferably, when in the pressing position, the pressing member can rotate relative to the ventilation cover, thereby causing the second container to rotate relative to the first container around its axis, so as to release the closure of the second container.
[0014] Preferably, the ventilation cover is provided with a door latch seat, and the button part is provided with a door latch fastener; in the initial position, the door latch fastener is engaged in the door latch seat, thereby achieving relative positioning of the ventilation cover and the button part.
[0015] Preferably, an elastic element is provided between the ventilation cover and the pressing element so that the pressing element is forced to move to the pressing position after the door latch is disengaged from the door latch seat.
[0016] Preferably, the button is provided with a limiting member, and the ventilation cover is provided with a slot. When the button is in the initial position, the limiting member is embedded in the slot to restrict the relative rotation between the button and the ventilation cover. When the button is in the pressed position, the limiting member is disengaged from the slot.
[0017] Preferably, an elastic element is provided between the ventilation cover and the pressing element to force the limiting element out of the slot.
[0018] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:
[0019] Firstly, the mixing device is equipped with a first container and a second container to hold the two substances respectively. This allows for the appropriate proportions to be pre-mixed at the factory, thus avoiding uneven distribution of the two substances during actual operation by the customer or operator. In addition, the mixing device only requires the operator to apply a first force and a second force to achieve the mixing of the two substances. At the same time, it allows the mixed substance in the first container to be connected to the atmosphere, making the overall operation more convenient and avoiding the risk of the operator directly contacting the chemical reagents.
[0020] Secondly, this mixing device can be widely used in various scenarios where two substances need to be mixed, especially in experimental or industrial production applications where the mixing conditions are relatively precise and the mixing process needs to be controlled step by step. Attached Figure Description
[0021] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0023] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention;
[0024] Figure 3 This is a three-dimensional structural cross-sectional view of the first and second containers of this utility model;
[0025] Figure 4 This is an exploded view of the first container, the sealing element, and the second container of this utility model;
[0026] Figure 5 This is an exploded view of the first container, the second container, the ventilation cover, and the pressing component of this utility model;
[0027] Figure 6 This is an exploded view of the ventilation cover and pressing component of this utility model;
[0028] Figure 7 This is an exploded view of the second container, sealing element, and pressing element of this utility model;
[0029] Figure 8 This is an assembly diagram of the ventilation cover and pressing component of this utility model.
[0030] Figure Labels
[0031] 1-First container; 11-Limiting part; 13-First shell; 14-Middle cover; 15-Second shell; 2-Second container; 21-Limiting rib; 22-Sealing gasket; 3-Sealing element; 31-Limiting groove; 32-Sealing ring; 33-Stop bar; 4-Ventilation cover; 41-Door latch seat; 43-Card slot; 5-Pressing element; 51-Button part; 511-Limiting element; 52-Connecting part; 53-Door latch fastener; 6-Elastic element. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0033] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.
[0034] Reference Figures 1 to 8 As shown in the figure, this utility model embodiment provides a mixing device, which mainly includes a first container 1 and a second container 2.
[0035] The first container 1 is used to hold the first substance and serves as a storage space for the first substance during the mixing process, as well as a mixing space for the first and second substances. The specific shape, size, and material of its chamber can be designed according to actual needs. For example, it can be a cylindrical, square, or other different shaped chamber. The material can be selected from materials with certain strength and corrosion resistance to accommodate different types of the first substance.
[0036] The second container 2 is located at the open end of the first container 1, and its bottom has a sealing element 3 to form a cavity for holding a second substance. That is, the second container 2 and the sealing element 3 together form the cavity. The sealing element 3 can ensure that the second substance can be effectively sealed in the second container 2 to prevent leakage. The shape and size of the second container 2 will also be determined according to the actual situation, and it is structurally adapted to the first container 1 so as to achieve a sealed contact with the first container 1 and subsequent operation.
[0037] The mixing device has a first state and a second state. In the first state, the second container 2 closes the opening of the first container 1 to enclose the first substance within the first container 1, while the second substance is enclosed within the cavity of the second container 2. In the second state, the second container 2 releases the seal on the opening of the first container 1, connecting the interior of the first container 1 with the external atmosphere, and the seal 3 releases the seal on the second container 2, releasing the second substance from the second container 2 into the first container 1. In the first state, the mixing device is subjected to a first force and a second force to switch from the first state to the second state. After the mixing device is subjected to the first force, the second container 2 releases the seal on the opening of the first container 1, connecting the interior of the first container 1 with the external atmosphere. After the mixing device is subjected to the second force, the seal 3 releases the seal on the second container 2, releasing the second substance from the second container 2 into the first container 1.
[0038] The state transition process of the mixing device is as follows: In the first state, the second container 2 is in sealed contact with the first container 1, achieving the sealing of the chamber of the first container 1. At the same time, the sealing element 3 also ensures the sealing of the sealed space inside the second container 2. At this time, the first substance is in the chamber of the first container 1, and the second substance is in the sealed space of the second container 2. The two are in a mutually isolated state, preventing the substances in the two containers from coming into contact with the outside world (e.g., moisture in the air), which can effectively ensure the effectiveness of the substances in the two containers.
[0039] To transition the mixing device from the first state to the second state, a first force and a second force need to be applied to the mixing device. These two forces can be applied sequentially, with no particular order; either the first force can be applied first, or the second force can be applied first.
[0040] When the first force of the mixing device is applied, the second container 2 releases its sealed contact with the first container 1. This operation breaks the sealed isolation between the first container 1 and the second container 2, creating a gas channel that allows the first container 1 to communicate with the outside atmosphere, enabling rapid exchange or circulation of external air pressure with the air pressure inside the first container 1. After the first force is applied, when the second force of the mixing device is applied, the seal 3 detaches from the second container 2. At this time, the second substance, which was originally sealed in the closed space of the second container 2, can enter the first container 1 and mix with the first substance because the seal 3 is no longer obstructing it.
[0041] Similarly, in another operational step, a second force is applied first, followed by a first force. In this embodiment, the seal 3 first detaches from the second container 2, allowing the first and second substances to mix. Subsequently, the gas channel is opened, allowing the gas produced after the first and second substances mix to escape into the external environment. This method prioritizes the chemical reaction process between the two substances by allowing them to mix rapidly first. Opening the gas channel after the reaction has begun allows the two substances to react within a relatively independent space for a certain period, preventing the gas produced in the early stages of the reaction from prematurely escaping into the external environment and avoiding interference from external gases that could disrupt the reaction process between the first and second substances.
[0042] In summary, this mixing device can be widely used in various scenarios requiring the mixing of two substances, especially in situations where precise mixing conditions and step-by-step control of the mixing process are necessary. By controlling the first and second forces acting on the mixing device, the two substances are mixed according to a specific sequence and conditions, thus avoiding problems such as premature volatilization or uneven mixing of the first and second substances. Furthermore, this flexible operating sequence allows users to arrange the mixing steps according to actual conditions and specific needs, increasing operational flexibility and adaptability, and better meeting the mixing requirements of different scenarios.
[0043] In some practical applications, under the action of a first force, the second container 2 moves relative to the first container 1 in a direction perpendicular or substantially perpendicular to the bottom surface of the first container 1, thereby releasing the closure of the opening end of the first container 1. That is, the movement of the second container 2 relative to the first container 1 is achieved by pressing or pulling.
[0044] In some practical applications, the second container 2 rotates relative to the first container 1 about its axis under the action of a second force, so as to release the closure of the second container 2.
[0045] Specifically, such as Figure 2 and Figure 7As shown, the second container 2 is configured as a cylindrical shape with one open end, and a plurality of limiting ribs 21 are evenly distributed on the side wall of its open end; the sealing element 3 is configured as a cover, and is provided with a plurality of limiting grooves 31 that are adapted to the limiting ribs 21 to realize the connection between the sealing element 3 and the second container 2; the sealing element 3 rotates relative to the second container 2, so that the limiting ribs 21 slide out from the limiting grooves 31, and the sealing element 3 detaches from the second container 2. For example, rotating the sealing element 3 clockwise can seal the connection between the sealing element 3 and the second container 2, while rotating the sealing element 3 counterclockwise can detach the sealing element 3 from the second container 2. In addition to the above-mentioned rotational connection method, a threaded connection method can also be used instead, and the specific rotational connection method depends on the actual production needs and application scenarios.
[0046] In addition, a sealing ring 32 is installed on the bottom wall of the cover of the sealing element 3 (e.g., Figure 3 This is to achieve a sealed connection between the seal 3 and the second container 2.
[0047] In some practical applications, based on the aforementioned rotatable connection between the second container 2 and the seal 3, a structural design is implemented to address the detachment process between the seal 3 and the second container 2. Specifically, for example... Figure 2 and Figure 3 As shown, the sealing element 3 is rotatably connected to the opening end of the second container 2; the first container 1 is provided with a limiting part 11 adapted to the sealing element 3. When the second container 2 rotates relative to the first container 1 around its axis under the action of the second force, the limiting part 11 forces the sealing element 3 to rotate relative to the second container 2, so that the sealing element 3 is disengaged from the second container 2.
[0048] In some practical applications, such as Figure 3 As shown, the second container 2 is provided with a sealing gasket 22; in the first state, the sealing gasket 22 abuts against the first container 1 to close the opening end of the first container 1; in the second state, the sealing gasket 22 disengages from the first container 1, releasing the closure of the opening end of the first container 1.
[0049] Specifically, the first container 1 has an open end that allows the second container 2 to at least partially enter the first container 1. The open end is a partial channel structure of the ventilation channel. The sealing gasket 22 at the edge of the second container 2 is generally hood-shaped. When the second container 2 is in the first state, the sealing gasket 22 is pressed against the side of the open end of the first container 1 to achieve the sealing of the first container 1. When the second container 2 is in the second state, that is, when the second container moves upward, the second container 2 releases the sealing contact with the first container 1 to open the gas channel.
[0050] In some practical applications, in the second state, after the mixing device is subjected to a third force, the second container 2 closes the opening of the first container 1 again, thereby isolating the interior of the first container 1 from the external atmosphere. That is, the operator can apply a third force again to move the second container 2 downwards, causing the sealing gasket 22 to press against the opening of the first container 1, thus sealing the first container 1 again. This design can be applied to situations where long-term release of the mixture of the first and second substances is not required; the third force can isolate the first container 1 from the outside environment.
[0051] In some practical applications, based on any of the above embodiments, the mixing device further includes a ventilation cover 4 and a pressing element 5.
[0052] like Figure 2 , Figure 5 and Figure 6 As shown, the ventilation cover 4 is installed on the first container 1; the pressing member 5 has a button portion 51 and a connecting portion 52 disposed on the button portion 51, the free end of the connecting portion 52 passing through the ventilation cover 4 and connected to the second container 2; the pressing member 5 can move relative to the ventilation cover 4 from an initial position to a pressing position. In the initial position, the mixing device is in a first state; in the pressing position, the pressing member 5 drives the second container 2 to release the seal on the opening end of the first container 1, realizing the communication between the inside of the first container 1 and the outside atmosphere. The first force is to push or pull the pressing member 5 to make it press position, while the second force is to rotate the pressing member 5. In the pressing position, the pressing member 5 can rotate relative to the ventilation cover 4, thereby driving the second container 2 to rotate around its axis relative to the first container 1, so as to release the seal of the second container 2.
[0053] The button part 51 can be designed as a flat, round or square shape with a certain texture or curvature on the surface to provide better grip and tactile feel when pressed by fingers. The ventilation cover 4 is provided with several ventilation openings connecting its inner and outer ends.
[0054] In summary, the connecting part 52 at least partially passes through the ventilation cover 4 and achieves both sliding and rotational engagement with it. The sliding engagement allows the connecting part 52 to move linearly or slide within the perforation of the ventilation cover 4, while the rotational engagement allows the connecting part 52 to rotate around an axis within a certain range. This connection method ensures both the relative movement flexibility between the connecting part 52 and the ventilation cover 4 and the stability of the connection. Several connecting parts 52 are connected to the second container 2, thereby accurately transmitting the actions applied by the operator to the button part 51 to the second container 2.
[0055] By setting the button section 51, the first or second force applied to the second container 2 is concentrated so that the operator can directly apply it to the button section 51, so that the operator does not need to directly operate the second container 2 or other complex components, reducing the difficulty of operation and improving the efficiency of operation.
[0056] In some practical applications, such as Figure 2 and Figure 5 As shown, a locking structure is provided between the ventilation cover 4 and the button part 51. Specifically, the ventilation cover 4 is provided with a door latch seat 41, and the button part 51 is provided with a door latch fastener 53. In the initial position, the door latch fastener 53 is engaged in the door latch seat 41, realizing the relative positioning of the ventilation cover 4 and the button part 5. The door latch seat and the door latch fastener are existing plastic door latches. These plastic door latches are standard parts and can be purchased and used according to usage requirements. Pressing the door latch fastener will lock it onto the door latch seat. Pressing the door latch fastener again will cause it to spring upward to unlock the connection with the door latch seat. The structure of a ballpoint pen press can also be referred to.
[0057] In some practical applications, based on plastic door latches, such as Figure 2 and Figure 5 As shown, an elastic element 6 is provided between the ventilation cover 4 and the pressing member 5 so that after the door latch 53 disengages from the door latch lock seat 41, the pressing member 5 is forced to move to the pressing position. The pressing position and the initial position of the pressing member 5 are achieved by the plastic door latch. When the ventilation cover 4 and the button part 51 are connected together, the mixing device is in the first state, and the pressing member 5 is in the initial position. At this time, the locking of the door latch and the door latch lock seat can prevent the operator from accidentally touching the button part 51 and causing the button part 51 to rotate. In actual use, the operator needs to press the button part 51 to apply the first force to unlock the lock seat and the latch of the plastic door latch. Under the action of the elastic element 6 (usually a spring), the button part 51 is pushed upward, and then the second force can be applied.
[0058] In other practical applications, such as Figure 2 and Figure 5 As shown, the ventilation cover 4 and the button part 51 are elastically connected by an elastic member 6. When the pressing member 5 is in the initial position, the limiting member 511 on the button part 51 is embedded in the slot 43 on the ventilation cover 4 to restrict the relative rotation between the pressing member 5 and the ventilation cover 4. When the pressing member 5 is in the pressed position, the elastic member 6 pushes the button part 51 away from the ventilation cover 4, so that the limiting member 511 disengages from the slot 43. In this embodiment, the limiting member 511 and the slot 43 prevent the pressing member 5 from rotating when it is in the pressed position, thus avoiding the operator accidentally rotating the button part 51 when the mixing device is in the first state, which could cause the seal 3 on the second container 2 to fall off.
[0059] In other practical applications, based on the above implementation methods, such as Figure 2 As shown, the first container 1 consists of a first shell 13 and a middle cover 14. The middle cover is detachably installed at the opening end of the first shell. The second container 2 is located above the middle cover 14. The ventilation cover 4 can also be detachably connected to the middle cover 14. Several connecting parts 52 can also be detachably connected to the second container 2, for example, by snap-fit. A second shell 15 is fitted outside the first shell 13, and the second shell 15 is detachably connected to the ventilation cover 4.
[0060] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.
Claims
1. A mixing device, characterized in that, include: The first container (1) is used to hold the first substance; The second container (2) is located at the open end of the first container (1) and has a seal (3) at its bottom to form a cavity for holding the second substance; The mixing device has a first state and a second state; In the first state, the second container (2) closes the opening of the first container (1) to enclose the first substance in the first container (1), while the second substance is enclosed in the cavity of the second container (2); in the second state, the second container (2) releases the seal on the opening of the first container (1), connecting the inside of the first container (1) with the outside atmosphere, and the seal (3) on the second container (2) is released, and the second substance in the second container (2) is released into the first container (1); In the first state, the mixing device is subjected to a first force and a second force to switch from the first state to the second state; after the mixing device is subjected to the first force, the second container (2) releases the seal on the opening end of the first container (1) to achieve communication between the inside of the first container (1) and the outside atmosphere; after the mixing device is subjected to the second force, the seal (3) releases the seal on the second container (2) and the second substance in the second container (2) is released into the first container (1).
2. The mixing device according to claim 1, characterized in that, Under the action of the first force, the second container (2) moves relative to the first container (1) in a direction perpendicular to or substantially perpendicular to the bottom surface of the first container (1) to release the closure of the opening end of the first container (1).
3. The mixing device according to claim 1, characterized in that, The second container (2) rotates relative to the first container (1) about its axis under the action of the second force, so as to release the closure of the second container (2).
4. The mixing apparatus according to claim 3, characterized in that, The sealing element (3) is rotatably connected to the opening end of the second container (2); the first container (1) is provided with a limiting part (11) that is adapted to the sealing element (3). When the second container (2) rotates relative to the first container (1) around its axis under the action of the second force, the limiting part (11) forces the sealing element (3) to rotate relative to the second container (2), so that the sealing element (3) is disengaged from the second container (2).
5. The mixing apparatus according to claim 3, characterized in that, The second container (2) is configured as a cylindrical shape with one end open, and a number of limiting ribs (21) are evenly distributed on the side wall of the open end; the sealing element (3) is configured as a cover, and a number of limiting grooves (31) are provided on it to match the limiting ribs (21) so as to realize the connection between the sealing element (3) and the second container (2); the sealing element (3) rotates relative to the second container (2), so that the limiting ribs (21) slide out from the limiting grooves (31) and the sealing element (3) is separated from the second container (2).
6. The mixing apparatus according to claim 1, characterized in that, The second container (2) is provided with a sealing gasket (22); in the first state, the sealing gasket (22) abuts against the first container (1) to close the opening end of the first container (1); in the second state, the sealing gasket (22) disengages from the first container (1) and releases the closure of the opening end of the first container (1).
7. The mixing apparatus according to claim 2, characterized in that, In the second state, after the second container (2) is subjected to the third force, the second container (2) closes the opening end of the first container (1) again to achieve the isolation between the inside of the first container (1) and the outside atmosphere.
8. The mixing apparatus according to claim 1, characterized in that, The mixing device further includes: Ventilation cover (4) is installed on the first container (1); The pressing part (5) has a button part (51) and a connecting part (52) provided on the button part (51). The free end of the connecting part (52) passes through the ventilation cover (4) and is connected to the second container (2). The pressing member (5) can move from the initial position to the pressing position relative to the ventilation cover (4). In the initial position, the mixing device is in the first state. In the pressing position, the pressing member (5) drives the second container (2) to release the closure of the opening end of the first container (1), thereby realizing the communication between the inside of the first container (1) and the outside atmosphere.
9. The mixing apparatus according to claim 8, characterized in that, When in the pressing position, the pressing member (5) can rotate relative to the ventilation cover (4), thereby driving the second container (2) to rotate relative to the first container (1) around its axis, so as to release the closure of the second container (2).
10. The mixing apparatus according to claim 8, characterized in that, The ventilation cover (4) is provided with a door latch seat (41), and the button part (51) is provided with a door latch fastener (53); in the initial position, the door latch fastener (53) is engaged in the door latch seat (41) to achieve relative positioning of the ventilation cover (4) and the pressing part (5).
11. The mixing apparatus according to claim 10, characterized in that, An elastic element (6) is provided between the ventilation cover (4) and the pressing element (5) so that the pressing element (5) is forced to move to the pressing position after the door latch (53) disengages from the door latch seat (41).
12. A mixing device according to claim 8, characterized in that, The button part (51) is provided with a limiting member (511), and the ventilation cover (4) is provided with a slot (43). When the pressing member (5) is in the initial position, the limiting member (511) is embedded in the slot (43) to restrict the relative rotation between the pressing member (5) and the ventilation cover (4); when the pressing member (5) is in the pressing position, the limiting member (511) is disengaged from the slot (43).
13. A mixing device according to claim 12, characterized in that, An elastic element (6) is provided between the ventilation cover (4) and the pressing element (5) to force the limiting element (511) to disengage from the slot (43).