A rotary opening solid-liquid mixing device
The solid-liquid mixing device, which is opened by rotation, solves the problems of safety ring falling off and assembly errors, and achieves precise alignment and controllable dispensing, making it suitable for industrial production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- APTAR (CHINA) INVESTMENT CO LTD
- Filing Date
- 2024-03-01
- Publication Date
- 2026-08-04
AI Technical Summary
Existing solid-liquid mixing packaging devices have problems such as the safety ring easily falling off and polluting the environment, high assembly error rate, and difficulty in controlling the dispensing amount.
A rotary-opening solid-liquid mixing device was designed. Assembly is achieved by sliding and pressing the bottle body and the upper and lower caps together. The initial opening is achieved by rotation. It is equipped with a breakable safety ring and a limiting structure. The inner inclined surface of the head guides the liquid. The soft rubber button controls the volume change. The massage head is detachable.
It achieves precise alignment during assembly, avoiding assembly errors. The safety ring is stored inside the device, preventing environmental pollution. The output is controllable, the structure has high reliability, and it is suitable for industrial production.
Smart Images

Figure CN120571490B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of packaging containers for daily chemical products and food, and more specifically to a rotary-opening solid-liquid mixing device. Background Technology
[0002] In the field of daily chemical products or food packaging technology, there is a large demand for solid-liquid mixing or liquid-liquid mixing. Currently, existing solid-liquid mixing or liquid-liquid mixing packaging technology usually stores the first material in the cap and the second material in the bottle. The cap is equipped with a puncture element and a puncturable sealing film or seal. By pressing down the cap, the puncture element punctures the sealing film or seal, releasing the first material.
[0003] The drawbacks of this type of packaging device are as follows: First, the safety ring needs to be removed before use, and once removed, it is easily dropped into the environment, polluting it and is not easy to recycle. Second, the same action is used during factory assembly and initial opening at the user end. For example, the cap and bottle are assembled by pressing down during assembly, and the user also punctures the cap by pressing down during use. This results in a high error rate on the assembly line because it is difficult to set a strong limiting structure to indicate that the device has been assembled to the predetermined position in order to facilitate the user's start of the mixing device. During assembly, the puncturing component can easily puncture the sealing film or seal, causing the device to malfunction. Third, the mixed liquid needs to be squeezed or poured out of the bottle mouth during use, making it difficult to control the amount dispensed. Summary of the Invention
[0004] In view of the above-mentioned deficiencies of the prior art, the present invention provides a rotary-opening solid-liquid mixing device, including a bottle body and a first cap body, wherein a first opening is provided at the first end of the bottle body; The first cover includes an upper cover and a lower cover. The lower cover is connected to the first end of the bottle and covers the first opening. The upper cover is connected to the outer periphery of the lower cover by a threaded structure. The lower cover is provided with a partition. The space formed between the partition, the inner wall of the upper cover, and the inner wall of the lower cover constitutes a first cavity. The first cavity is used to store the first material. The bottle is provided with a second cavity. The second cavity is used to store the second material. The upper cover is provided with a piercing element. The piercing element is connected to the inner top surface of the upper cover and placed in the first cavity. In the initial state, the piercing element is located above the partition. When the upper cover rotates relative to the lower cover, the upper cover presses down on the safety ring, causing the safety ring to fall onto the storage platform. The upper cover then moves the piercing element downward to crush or pierce the partition, causing the first material to fall into the second material and mix.
[0005] According to one embodiment of the present invention, a breakable safety ring is provided below the upper cover, and a storage platform is provided below the safety ring. The storage platform protrudes along the outer peripheral wall of the bottle in a direction away from the axis of the bottle.
[0006] According to one embodiment of the present invention, the safety ring is further connected to the lower cover body through a breakable portion, the strength of the breakable portion is less than the strength of the safety ring, and the breakable portion is a thin sheet or a plurality of fracture bridge points.
[0007] According to one embodiment of the present invention, a dispensing head is further provided at the second end of the bottle body for dispensing the liquid inside the bottle body.
[0008] According to one embodiment of the present invention, the upper end of the upper cover is provided with a flexible soft rubber button, and the lower end of the dispensing head is provided with a liquid outlet. When the partition is crushed or punctured, pressing the soft rubber button creates a pressure difference within the bottle, thereby dispensing the liquid from the liquid outlet. The volume change generated by each press of the soft rubber button is controllable, so as to dispense a predetermined amount of liquid.
[0009] According to one embodiment of the present invention, the dispensing head further includes a liquid guiding section and a liquid dispensing tooth communicating with the liquid guiding section, wherein the inner circumferential surface at the connection between the liquid guiding section and the liquid dispensing tooth is an inclined surface. The aforementioned inclined surface is used to guide the liquid into the dispensing tooth, preventing material accumulation inside the bottle.
[0010] According to one embodiment of the present invention, the upper cover further includes ribs disposed on the inner top surface of the soft rubber button, and the strength of the ribs is greater than the strength of the soft rubber button. During pressing, due to the action of the ribs, the soft rubber button can rebound and reset more quickly and evenly. Preferably, the ribs can be symmetrically arranged.
[0011] According to one embodiment of the present invention, it further includes a massage head, the massage head comprising a plurality of massage teeth, the massage head being detachably coupled to the dispensing head.
[0012] According to one embodiment of the present invention, it further includes a second cover, which is detachably fitted onto the dispensing head. The second cover is provided with a sealing gasket, which can be combined with the inner top surface of the second cover. When the second cover is fitted onto the dispensing head, the liquid outlet is pressed against the sealing gasket.
[0013] According to one embodiment of the present invention, the puncturing member further includes a sheath extending downward from the inner top surface of the upper cover and a sharp puncture portion provided at the lower end of the sheath. The outer peripheral wall of the sheath is provided with a first interference edge that interferes with the inner peripheral wall of the lower cover to form a seal.
[0014] According to one embodiment of the present invention, the bottom of the piercing member is further provided as an inclined surface, and the partition is provided with a thin-walled area that is easy to pierce, the thin-walled area being arranged along a preset cutting path of the piercing member.
[0015] According to one embodiment of the present invention, the outer peripheral wall of the first end of the bottle body is provided with a first alignment structure, and the outer peripheral wall of the lower cap body is provided with a second alignment structure. The first alignment structure is a first boss or a first groove, and the second alignment structure is a second boss or a second groove that mates with the first alignment structure. The first end of the first groove or the second groove is provided with a first alignment opening. The first boss or the second boss enters the first groove or the second groove from the first alignment opening and abuts against the second end of the first groove or the second groove. The first alignment structure and the second alignment structure constitute a first limiting part. The first limiting part is used to control the relative position and assembly height between the bottle body and the lower cap body during assembly.
[0016] According to one embodiment of the present invention, the lower cover body is provided with a third alignment structure on its outer peripheral wall, the third alignment structure being a third protrusion or a third groove, and the upper cover body is provided with a fourth alignment structure on its inner peripheral wall, the fourth alignment structure being a fourth protrusion or a fourth groove that cooperates with the third alignment structure. The upper and lower ends of the third groove or the fourth groove are provided with openings, and the third protrusion or the fourth protrusion can enter or exit the third groove or the fourth groove from the openings. The third alignment structure and the fourth alignment structure constitute a second limiting part.
[0017] The second limiting part is used to control the relative position between the upper cover and the lower cover during assembly, so as to control the threaded structure between the upper cover and the lower cover at a predetermined position. When the predetermined position is reached, the threads between the upper cover and the lower cover will form interference to control the assembly height between the upper cover and the lower cover, and prevent the piercing part from piercing the partition when it is inserted too deeply, which would cause the assembly to fail.
[0018] The beneficial effects of this invention are: 1. During assembly, the present invention achieves assembly by sliding and pressing down between the bottle body and the upper and lower caps. During use, the initial opening and puncturing mixing are achieved by rotating. The assembly and initial opening are achieved through differentiated actions, so that corresponding alignment structures can be set during assembly to prevent assembly errors. 2. The present invention dispenses liquid by pressing a soft rubber button. The volume change caused by pressing the soft rubber button is controllable, so as to dispense a predetermined amount of liquid. In addition, support ribs are provided on the inner surface of the soft rubber button so that the soft rubber button can rebound and reset more quickly and evenly. 3. In this invention, the inner circumferential surface at the connection between the liquid guiding part and the liquid dispensing tooth in the dispensing head is set as an inclined surface to prevent material accumulation inside the bottle; 4. The present invention features a detachable massage head that can be reused and cleaned to meet different user needs; 5. The present invention has high structural reliability and is easy to industrialize; 6. The safety ring in this invention will fall onto the storage platform on the bottle after the device is turned on, and will not fall into the environment and pollute it, and it is easy to recycle.
[0019] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the solid-liquid mixing device in one embodiment of the present invention; Figure 2 This is an exploded view of a solid-liquid mixing device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the upper cover and the lower cover in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the lower cover and the bottle body in one embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of the solid-liquid mixing device before its first activation in one embodiment of the present invention; Figure 6 This is a cross-sectional schematic diagram of the solid-liquid mixing device after its first activation in one embodiment of the present invention; Figure 7 This is a perspective view of the combination of a dispensing head and a massage head in a solid-liquid mixing device according to an embodiment of the present invention; Figure 8 This is a perspective view of a solid-liquid mixing device with multiple liquid-dispensing toothed heads according to an embodiment of the present invention; Figure 9 This is a perspective view of the upper cover body in one embodiment of the present invention.
[0021] Figure label: 1-Bottle body; 11-First opening; 12-Dispensing head; 121-Liquid guiding section; 122-Dispensing teeth; 1221-Dispensing opening; 13-Receiving platform; 14-First alignment structure; 2-First cover; 21-Upper cover; 211-Piercing part; 2111-Sheath; 2112-Piercing part; 2113-First Interference edge; 212-Safety ring; 213-Fragile part; 214-Soft rubber button; 2141-Rib; 215-Fourth alignment structure; 22-Lower cover; 221-Separator; 222-Second alignment structure; 223-Third alignment structure; 23-First cavity; 24-Second cavity; 3-Second cover; 31-Sealing gasket; 4-Massage head; 41-Massage teeth. Detailed Implementation
[0022] To make the technical means, inventive features, objectives, and effects of the invention readily understandable, the invention is further illustrated below with reference to specific figures. However, the invention is not limited to the embodiments described below.
[0023] like Figure 1 , Figure 2 As shown, this embodiment provides a rotary-opening solid-liquid mixing device, including a bottle body 1, a first cap 2, a second cap 3, and a massage head 4.
[0024] like Figure 2 , Figure 5 As shown, the bottle body 1 has a first opening 11 at its first end. The first cap 2 includes an upper cap 21 and a lower cap 22. The lower cap 22 is connected to the first end of the bottle body 1 and covers the first opening 11. The upper cap 21 is connected to the outer periphery of the lower cap 22 by a threaded structure. A partition 221 is provided inside the lower cap 22. The space formed between the partition 221, the inner wall of the upper cap 21, and the inner wall of the lower cap 22 constitutes a first cavity 23, which is used to store the first material. The bottle body 1 has a second cavity 24, which is used to store the second material.
[0025] like Figure 3 , Figure 5 , Figure 6As shown, the upper cover 21 is provided with a piercing element 211, which is connected to the inner top surface of the upper cover 21 and placed within the first cavity 23. The piercing element 211 includes a sheath portion 2111 extending downwards from the inner top surface of the upper cover 21 and a sharp piercing portion 2112 located at the lower end of the sheath portion 2111. The outer peripheral wall of the sheath portion 2111 has a protruding first interference edge 2113, which interferes with the inner peripheral wall of the lower cover 22 to form a seal. The bottom of the piercing portion 2112 is beveled. The partition 221 within the lower cover 22 has a thin-walled area that is easily pierced, and this thin-walled area is arranged along a predetermined cutting path of the piercing element 211. Figure 4 , Figure 5 , Figure 6 As shown, a breakable safety ring 212 is provided below the upper cover 21. The safety ring 212 is connected to the lower cover 22 through a breakable portion 213. The strength of the breakable portion 213 is less than that of the safety ring 212. The breakable portion 212 is configured as a thin ring or several breakage points. Below the safety ring 212, a storage platform 13 is provided. The storage platform 13 is located on the outer peripheral wall of the bottle body 1 and protrudes along the outer peripheral wall of the bottle body 1 in a direction away from the axis of the bottle body 1.
[0026] like Figure 5 , Figure 6 As shown, in the initial state, the piercing element 211 is located above the partition 221. When the upper cover 21 rotates relative to the lower cover 22, the upper cover 21 presses down against the safety ring 212, causing the safety ring 212 to fall onto the storage platform 13. The upper cover 21 drives the piercing element 211 to move down and pierce or break the partition 221, causing the first material to fall into the second material and mix.
[0027] like Figure 4 , Figure 5 , Figure 8 As shown, a dispensing head 12 is provided at the second end of the bottle body 1. The dispensing head 12 is used to dispense the liquid inside the bottle body 1. The dispensing head 12 includes a liquid guiding part 121 and a liquid dispensing tooth 122 connected to the liquid guiding part 121. The inner circumferential surface of the connection between the liquid guiding part 121 and the liquid dispensing tooth 122 is a slope. The aforementioned slope is used to guide the liquid into the dispensing tooth 122 and prevent the accumulation of material inside the bottle body 1.
[0028] like Figure 2 , Figure 9As shown, an elastic soft rubber button 214 is provided at the upper end of the upper cover 21. A rib 2141 is provided on the inner top surface of the soft rubber button 214, and the strength of the rib 2141 is greater than that of the soft rubber button 214. The rib 2141 can be directly fixed to the soft rubber button 214, or the rib 2141 can be integrally injection molded with the upper cover 21, and then the soft rubber button 214 can be injection molded again or installed onto the upper cover 21 with the rib 2141 tightly against the inner top surface of the soft rubber button 214. During pressing, due to the action of the rib 2141, the soft rubber button 214 can rebound and reset more quickly and evenly.
[0029] like Figure 4 As shown, a first alignment structure 14 is provided on the outer peripheral wall of the first end of the bottle body 1, and a second alignment structure 222 is provided on the outer peripheral wall of the lower cap 22. The first alignment structure 14 is a first boss, and the second alignment structure 222 is a second groove that mates with the first alignment structure 14. A first alignment opening is provided at the first end of the second groove. The first boss enters the first groove through the first alignment opening and abuts against the second end of the first groove. The first alignment structure 14 and the second alignment structure 222 constitute a first limiting part. The first limiting part is used to control the relative position and assembly height between the bottle body 1 and the lower cap 22 during assembly.
[0030] like Figure 3 As shown, the lower cover 22 has a third alignment structure 223 on its outer peripheral wall, which is a third groove. The upper cover 21 has a fourth alignment structure 215 on its inner peripheral wall, which is a fourth protrusion that cooperates with the third alignment structure 223. The third groove has openings at both ends, and the fourth protrusion can enter or exit the third groove from the openings, so that the third alignment structure 223 and the fourth alignment structure 215 constitute a second limiting part.
[0031] like Figure 3 , Figure 5 , Figure 6 As shown, the second limiting part is used to control the relative position between the upper cover 21 and the lower cover 22 during assembly, so as to control the threaded structure between the upper cover 21 and the lower cover 22 at a predetermined position. When the predetermined position is reached, the threads between the upper cover 21 and the lower cover 22 will form interference to control the assembly height between the upper cover 21 and the lower cover 22, and prevent the piercing part 211 from piercing the partition 221 when the insertion is too deep, which would lead to assembly failure.
[0032] like Figure 2 , Figure 5 , Figure 8As shown, the dispensing head 12 can be provided with one or more dispensing teeth 122. The second cover 3 is detachably covered on the dispensing head 12. The second cover 3 is provided with a sealing gasket 31. The sealing gasket 31 can be combined with the inner top surface of the second cover 3. When the second cover 3 is covered on the dispensing head 12, the dispensing opening 1221 is pressed against the sealing gasket 31.
[0033] like Figure 2 , Figure 7 As shown, the massage head 4 includes several massage teeth 41, and the massage head 4 is detachably combined with the dispensing head 12.
[0034] The technical solution described in the above embodiments is used as follows: As shown in the figure, during assembly, first align the second alignment structure 222 at the lower cap 21 with the first alignment structure 14 at the bottle body, then press down the lower cap 21 so that the first alignment structure 14, i.e., the first boss, is inserted into the second alignment structure 222, i.e., the second groove, until the first boss abuts against the second end of the second groove. At this point, the lower cap 21 and the bottle body 1 are assembled. Next, align the fourth alignment structure 215, i.e., the fourth boss, at the upper cap 21 with the third alignment structure 223, i.e., the third groove, at the lower cap 21, and press down the upper cap 21. The fourth boss is inserted into the third groove, thereby controlling the relative position between the upper cover 21 and the lower cover 22 so that the threads between them are controlled at a predetermined position. When the upper cover 21 is pressed down until the fourth boss is dislodged from the third groove, the threads between the upper cover 21 and the lower cover 22 reach the predetermined initial position and form interference, making it difficult for the upper cover 21 to be pressed down further. This controls the assembly height between the upper cover 21 and the lower cover 22, preventing the piercing part 211 from piercing the partition 221 when inserted too deeply, thus causing assembly failure.
[0035] When the user first opens the bottle, the upper cover 21 is rotated. Since the fourth alignment structure 215, i.e. the fourth protrusion, has disengaged from the third alignment structure 223, i.e. the third groove, the rotation of the upper cover 21 is not restricted by the above structure. When the upper cover 21 is rotated, the lower end of the upper cover 21 presses down against the safety ring 212, the fragile part 213 breaks, the safety ring 212 disengages from the lower cover 22 and falls onto the storage platform 13. The upper cover 21 continues to rotate, and the upper cover 21 drives the piercing piece 211 to move down and cut the partition 221. The second material stored in the second cavity 24 falls into the first cavity 23 inside the bottle 1 and mixes with the first material. The bottle 1 is shaken to make the first material and the second material mix evenly.
[0036] Dispensing liquid: Remove the second cap 3 and press the soft rubber button 214 to create a pressure difference inside the bottle 1, thereby dispensing the liquid from the liquid outlet 1221 of the dispensing head 12.
[0037] Optionally, a massage head 4 can be installed on the dispensing head 12 according to the user's needs for use on the scalp or other areas. In this case, after the liquid is dispensed from the dispensing opening 1221, it is spread evenly by the massage head 4 and massaged to promote absorption.
[0038] It should be understood that the preferred embodiments of the present invention have been described in detail above. It is clear that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.
[0039] In the description of this invention, it should be noted that the terms "upper / lower end," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "set / set up," "sleeve," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The structures, proportions, sizes, etc., illustrated in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the conditions under which this invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this invention, should still fall within the scope of the technical content disclosed in this invention.
Claims
1. A rotary-opening solid-liquid mixing device, characterized in that, It includes a bottle body and a first cap, wherein a first opening is provided at the first end of the bottle body; The first cover includes an upper cover and a lower cover. The lower cover is connected to the first end of the bottle and covers the first opening. The upper cover is connected to the outer periphery of the lower cover by a threaded structure. The lower cover is provided with a partition. The space formed between the partition, the inner wall of the upper cover, and the inner wall of the lower cover constitutes a first cavity. The first cavity is used to store the first material. The bottle is provided with a second cavity. The second cavity is used to store the second material. The upper cover is provided with a piercing element. The piercing element is connected to the inner top surface of the upper cover and placed in the first cavity. In the initial state, the piercing element is located above the partition. When the upper cover is rotated during opening, the upper cover moves the piercing element relative to the partition, piercing the partition and causing the first material to fall into the second material for mixing. During assembly, the upper cover slides axially relative to the lower cover, and the second limiting part causes the thread between the upper cover and the lower cover to reach a predetermined initial position and form interference.
2. The solid-liquid mixing device according to claim 1, characterized in that, The upper cover is provided with a breakable safety ring at the bottom, and a storage platform is provided below the safety ring. The storage platform protrudes along the outer peripheral wall of the bottle in a direction away from the axis of the bottle.
3. The solid-liquid mixing device according to claim 2, characterized in that, The safety ring is connected to the lower cover through a breakable portion. The strength of the breakable portion is less than the strength of the safety ring. The breakable portion is a thin sheet or several fracture points.
4. The solid-liquid mixing device according to claim 1, characterized in that, A dispensing head is provided at the second end of the bottle body, which is used to dispense the liquid inside the bottle body.
5. The solid-liquid mixing device according to claim 4, characterized in that, The upper end of the cover is provided with a flexible soft rubber button, and the lower end of the dispensing head is provided with a liquid outlet.
6. The solid-liquid mixing device according to claim 4, characterized in that, The dispensing head includes a liquid guiding section and a liquid dispensing tooth connected to the liquid guiding section, and the inner circumferential surface at the connection between the liquid guiding section and the liquid dispensing tooth is an inclined surface.
7. The solid-liquid mixing apparatus according to claim 5, characterized in that, The upper cover also includes ribs, which are disposed on the inner top surface of the soft rubber button, and the strength of the ribs is greater than that of the soft rubber button.
8. The solid-liquid mixing device according to claim 4, characterized in that, It also includes a massage head, which comprises a plurality of massage teeth and is detachably coupled to the dispensing head.
9. The solid-liquid mixing device according to claim 4, characterized in that, It also includes a second cover, which is detachably fitted onto the dispensing head, and the second cover has a sealing gasket inside.
10. The solid-liquid mixing apparatus according to claim 1, characterized in that, The puncturing member includes a sheath extending downward from the inner top surface of the upper cover and a sharp puncture portion located at the lower end of the sheath. The outer peripheral wall of the sheath has a protruding first interference edge, which interferes with the inner peripheral wall of the lower cover to form a seal.
11. The solid-liquid mixing apparatus according to claim 1, characterized in that, The bottom of the piercing element is set as an inclined surface, and the partition has a thin-walled area that is easy to pierce. The thin-walled area is set along the preset cutting path of the piercing element.
12. The solid-liquid mixing apparatus according to claim 1, characterized in that, The outer peripheral wall of the first end of the bottle body is provided with a first alignment structure, and the outer peripheral wall of the lower cover body is provided with a second alignment structure. The first alignment structure is a first protrusion or a first groove, and the second alignment structure is a second protrusion or a second groove that cooperates with the first alignment structure. The first end of the first groove or the second groove is provided with a first alignment opening. The first protrusion or the second protrusion enters the first groove or the second groove from the first alignment opening and abuts against the second end of the first groove or the second groove. The first alignment structure and the second alignment structure constitute a first limiting part.
13. The solid-liquid mixing apparatus according to claim 1, characterized in that, The lower cover has a third alignment structure on its outer peripheral wall, which is a third protrusion or a third groove. The upper cover has a fourth alignment structure on its inner peripheral wall, which is a fourth protrusion or a fourth groove that mates with the third alignment structure. The upper and lower ends of the third groove or the fourth groove have openings, and the third protrusion or the fourth protrusion can enter or exit the third groove or the fourth groove from the openings. The third alignment structure and the fourth alignment structure constitute a second limiting part.