CN109808126B

CN109808126B - Core piece, stirrer, milk frother and manufacturing method of stirrer

Info

Publication number: CN109808126B
Application number: CN201711173196.4A
Authority: CN
Inventors: 周杰
Original assignee: Guangdong Midea Consumer Electric Manufacturing Co Ltd
Current assignee: Guangdong Midea Consumer Electric Manufacturing Co Ltd
Priority date: 2017-11-21
Filing date: 2017-11-21
Publication date: 2024-05-28
Anticipated expiration: 2037-11-21
Also published as: CN109808126A

Abstract

The invention discloses a core piece, a stirrer, a milk frothing machine and a manufacturing method of the stirrer, wherein the core piece is used for the stirrer of the milk frothing machine and comprises a base body part and a magnetic piece arranged in the base body part, the base body part is columnar, the side wall of the base body part is provided with a positioning rib extending outwards, and the middle part of the base body part is provided with a hollowed-out structure for positioning and fixing the core piece in an injection mold.

Description

Core piece, stirrer, milk frother and manufacturing method of stirrer

Technical Field

The invention relates to a core piece, a stirrer applying the core piece, a milk frothing machine applying the stirrer and a manufacturing method of the stirrer.

Background

The stirring system of the existing milk frother generally drives a magnet in the stirrer to rotate by magnetic traction, as shown in fig. 1 to 3, a driven magnet 101 'is arranged on the stirrer 1', a driving magnet is also arranged on the milk frother, and the driven magnet is driven to rotate by the driving magnet, so that the stirrer is driven to rotate in the inner container, and stirring is realized. The raw material of the stirrer is usually PP or POM, and the driven magnet is placed in the stirrer and sealed after two-shot molding. The stirrer 1' comprises an inner core 10' and a main body 20' positioned outside the core, the inner core cannot be molded first without positioning, after the second molding machine is cooled, the material used for forming the core can be seriously shrunk, so that a small gap can be formed at the joint between the outer main body and the core positioned inside the main body, the joint is easy to crack after high-temperature boiling, and the problem of shrinkage of the core in the cooling process after molding cannot be solved at any time by a reinforcement position.

Disclosure of Invention

The main object of the present invention is to provide a core, aimed at improving the structural strength of the stirrer.

In order to achieve the above purpose, the core piece provided by the invention is used for a stirrer of a milk frothing machine, and comprises a base body part and a magnetic piece arranged in the base body part, wherein the base body part is columnar, the side wall of the base body part is provided with a positioning rib which extends outwards, and the middle part of the base body part is provided with a hollowed-out structure for positioning and fixing the core piece in an injection mold.

Optionally, the hollow structure includes a plurality of through holes formed in the middle of the base body and a support table disposed in an area surrounded by the through holes.

Optionally, the base body portion is concavely provided with a containing groove at the periphery of the through hole, and the magnetic piece is contained in the containing groove.

Optionally, the magnetic part is provided with at least two, the quantity of accommodation groove with the quantity phase-match of magnetic part, the magnetic part in the circumference of supporting bench evenly spaced apart sets up.

Optionally, the positioning ribs are formed with positioning protrusions or positioning notches.

Optionally, the length range value of the positioning rib is 10 mm-15 mm; and/or the thickness range value of the positioning rib is 0.8 mm-1.3 mm.

The invention also proposes a stirrer comprising a main body portion, stirring vanes projecting outwardly from the sides of the main body portion, and a core as described above, the core being located within the main body portion.

Optionally, the stirring leaf equidistant is provided with a plurality of, and two are adjacent the stirring leaf with main part cooperation forms the tooth's socket, the location muscle orientation the tooth's socket extends, just the location muscle keep away from the terminal of base member with the tank bottom parallel and level of tooth's socket.

Optionally, the external diameter size of the stirring blade ranges from 76mm to 81mm.

Optionally, the base portion is in an elliptic cylinder shape, and a long axis direction of the base portion is consistent with an extending direction of the stirring blade.

Optionally, the stirrer further comprises a seat cushion, the middle part of the main body part is abutted against the upper surface of the seat cushion, and the magnetic piece is driven to rotate on the upper surface of the seat cushion by magnetic force.

Optionally, the stirrer further comprises a handle connected with the seat cushion, a shaft hole in which the main body part is in rotary fit with the handle is formed at a position corresponding to the hollow structure of the core piece, and the handle penetrates through the shaft hole.

Optionally, a boss is disposed at the abutting position of the seat cushion or the main body.

Optionally, a silica gel pad is further arranged on one side of the seat cushion, which faces away from the handle.

The invention also provides a milk frothing machine, which comprises a machine shell, a container arranged in the machine shell, a stirrer arranged in the container and a driving device arranged below the container, wherein the stirrer is the stirrer, and the driving device drives the main body part and the stirring blade to rotate through magnetic force between the driving device and the magnetic piece.

Optionally, the distance between the outer end of the stirring blade and the side wall of the container is 3.5 mm-6.5 mm.

The invention also provides a manufacturing method of the stirrer, which comprises the following steps:

The method comprises the steps that a core piece is manufactured through injection molding of a first mold, the core piece is provided with a base body part and positioning ribs connected with the side wall of the base body part, a hollowed-out structure is arranged in the middle of the base body part, and a containing groove is concavely formed in the periphery of the hollowed-out structure;

Embedding a magnetic piece into the accommodating groove;

the core piece with the magnetic piece is positioned and fixed in the second injection mold through clamping the positioning ribs and the hollow structure;

encapsulating and injecting the core piece through a second die to obtain a stirrer blank piece with stirring blades;

cutting the positioning ribs;

And drilling shaft holes in the positions of the stirrer blank corresponding to the hollow structures to obtain the stirrer.

Optionally, after the step of drilling the shaft hole in the stirrer blank at a position corresponding to the support table to obtain a stirrer semi-finished product, the method further comprises: the handle and the seat cushion are manufactured through injection molding of a third die, and the handle can be arranged in the shaft hole in a sliding penetrating mode.

Optionally, after the step of injection molding the handle and the seat cushion integrally by the third mold, the handle slidably penetrating through the shaft hole further includes: and a silica gel pad which is integrated with the seat cushion into a whole is injection molded on one side of the seat cushion, which is away from the handle.

Optionally, the composition of the material used for the overmolding in the step of overmolding the core with the magnetic member to produce the stirrer blank with stirring vanes comprises: polyoxymethylene and polytetrafluoroethylene.

According to the technical scheme, the core piece is used as the insert for injection molding of the stirrer, the side part of the matrix part of the core piece is provided with the outwards extending locating rib, the die cavity adopted by the in-die injection molding process is internally provided with the locating groove corresponding to the locating rib, after the core piece provided with the magnetic piece is placed into the die cavity of the die, the locating rib is placed into the locating groove, so that the core piece can be located in the die cavity, after the positioning of the core piece is realized, resin used for molding the main body is injected into the die cavity of the die, the core piece is contracted and tightened along with the shrinkage of the cooling main body of the injection molding machine, the main body is tightly wrapped and the magnetic piece is well sealed, and the defect that cracks exist between the core piece and the main body due to the fact that the main body and the core piece are molded by the in-die injection molding process in the related technology is avoided. The surface structure of the obtained stirrer is complete and seamless, and the using effect of the stirrer is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained from the structures shown in these drawings without the need of inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a related art stirrer at a view angle;

FIG. 2 is a schematic view of the stirrer of FIG. 1 from another perspective;

FIG. 3 is a schematic view of the stirrer of FIG. 1 from a further perspective;

FIG. 4 is a schematic perspective view of an embodiment of the core of the present invention, not shown;

FIG. 5 is a schematic view showing a part of the structure of an embodiment of the agitator of the present invention;

FIG. 6 is a cross-sectional view of the overall structure of the stirrer of the present invention;

FIG. 7 is a schematic cross-sectional view of an embodiment of a milk frothing machine of the present invention;

FIG. 8 is a schematic diagram of a first embodiment of a method of manufacturing a blender according to the present invention;

FIG. 9 is a schematic diagram of a second embodiment of a method of manufacturing a blender according to the present invention;

fig. 10 is a schematic structural view of a third embodiment of a method for manufacturing a stirrer according to the present invention.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				200	Core piece	304	Tooth slot
210	Base body part	305	Shaft hole
				211	Hollow structure	410	Handle
212	Bearing table	420	Seat cushion
				213	Through hole	421	Boss
214	Accommodating groove	430	Silica gel pad
				215	Magnetic member	500	Milk frothing machine
220	Positioning rib	510	Casing of machine
				301	Main body part	520	Container
303	Stirring blade	530	Driving device

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention will be understood by those of ordinary skill in the art as the case may be.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Referring to fig. 4, the present application proposes a core 200 for a stirrer of a milk frothing machine 500, the core 200 includes a base portion 210 and a magnetic member 215 mounted in the base portion 210, a positioning rib 220 extending outwards is disposed on a side wall of the base portion 210 in a column shape, and a hollow structure 211 for positioning and fixing the core 200 in an injection mold is disposed in the middle of the base portion 210.

Wherein the magnetic member 215 may be a permanent magnet or a metallic material capable of being magnetized, and the magnetic member 215 is driven by a rotating magnetic field in the milk frother 500 to rotate the entire mixer during the use of the mixer with the core member 200 of the present application.

According to the technical scheme of the invention, the core piece 200 is used as an insert for injection molding of the stirrer, the side part of the base body part 210 of the core piece 200 is provided with the outwards extending positioning rib 220, the mold cavity adopted by the in-mold injection molding process is internally provided with the positioning groove corresponding to the positioning rib 220, after the core piece 200 provided with the magnetic piece 215 is placed into the mold cavity of the mold, the positioning rib 220 is placed into the positioning groove, so that the core piece 200 can be positioned in the mold cavity, and after preliminary positioning of the core piece 200 is realized, the mold can be abutted against the hollowed-out structure 211 of the core piece 200 through the ejector pin, for example, so that the core piece 200 can be firmly fixed when a larger pressure exists in the molding process of the stirrer. Resin used for forming the main body is injected into the cavity of the die, and the main body is shrunk along with the cooling of the injection molding machine so as to shrink and tighten the core piece 200, thereby realizing tight package of the core piece 200 and good sealing of the magnetic piece 215, and avoiding the defect that cracks exist between the core piece 200 and the main body caused by the fact that the main body is firstly formed and then the main body and the core piece 200 are formed by adopting an in-die injection molding process in the related art. The surface structure of the obtained stirrer is complete and seamless, and the structural strength and the use effect of the stirrer are improved.

The hollow structure 211 includes a plurality of through holes 213 formed in the middle of the base portion 210, and a support table 212 disposed in an area surrounded by the plurality of through holes 213.

The supporting table 212 is used as a location and clamping position of the core piece 200 in the cavity, the supporting table 212 is of an integrated structure with the base body 210, the surface of the supporting table 212 is flush with the surface of the base body 210, and due to the arrangement of the plurality of through holes 213, molten resin can flow to the other side of the core piece 200 through the through holes 213 in the process of encapsulation and injection molding, so that the core piece 200 can be wrapped more quickly.

Preferably, the base portion 210 is concavely formed with a receiving groove 214 at the periphery of the through hole 213, and the magnetic member 215 is received in the receiving groove 214.

The core 200 of the application can be made of metal (nonmagnetic) or plastic or other materials, after the core 200 is molded, the core 200 is provided with the accommodating groove 214, the magnetic piece 215 is arranged in the accommodating groove 214, so that the magnetic piece 215 can be firmly fixed on the core 200, and the magnetic piece 215 is not easy to shift when the core 200 is encapsulated and molded to prepare the stirrer. Or when the core 200 is a plastic part, the magnetic part 215 is first placed as an insert in a cavity of a mold used for molding the core 200, and the magnetic part 215 is wrapped in the cavity by resin used for injection molding the core 200, so that the magnetic part 215 and the core 200 are molded into a whole by an in-mold injection molding process.

The number of the accommodating grooves 214 is matched with the number of the magnetic pieces 215, and the magnetic pieces 215 are uniformly arranged at intervals in the circumferential direction of the supporting table 212. The number of the magnetic members 215 is two, the magnetic members 215 are permanent magnets, and the NS magnetic pole direction of the permanent magnets is the up-down direction of the base portion 210. By providing the two magnetic members 215, the stirrer with the core 200 of the present application has a simple structure and is more uniformly stressed in the process of being driven to rotate by magnetic force.

In order to achieve a more firm fixing and positioning of the core 200, the positioning ribs 220 are formed with positioning protrusions or positioning notches.

The positioning ribs 220 are provided with positioning protrusions or positioning gaps, positioning grooves corresponding to the positioning protrusions or positioning convex columns corresponding to the positioning gaps are arranged in the cavities of the corresponding molds, and the core piece 200 is placed in the cavity of the mold, so that the positioning protrusions are inserted into the positioning grooves or the positioning convex columns are inserted into the positioning gaps, and the core piece 200 is stably positioned in the cavity.

It will be appreciated that positioning protrusions are provided on opposite sides of the positioning rib 220 in the thickness direction (up-down direction) to achieve better positioning of the core 200. A plurality of positioning protrusions may be further provided in the length direction of the positioning rib 220. Of course, when the positioning rib 220 is provided with the positioning notch, preferably, two opposite inner wall surfaces of the cavity are provided with positioning convex columns, and two sides of the positioning rib 220 are provided with positioning notches corresponding to the positioning convex columns or the positioning notch is a through hole 213 penetrating through the thickness direction of the positioning rib 220. Preferably, a plurality of positioning notches are provided along the length of the core 200. Further, the core 200 is provided with a plurality of positioning ribs 220, and the plurality of positioning ribs 220 are uniformly distributed.

The length of the positioning rib 220 is 10 mm-15 mm; and/or the thickness of the positioning rib 220 is 0.8mm to 1.3mm.

Too small a length of the positioning rib 220 may result in poor positioning effect of the positioning rib 220 on the core 200 in the cavity, and too large a length of the positioning rib 220 may increase the molding cost of the stirrer, preferably, the length of the positioning rib 220 is 10mm, 11mm, 12mm, 13mm, 14mm, 15mm. After the stirrer is molded, the positioning rib 220 may extend out of the main body 301, and in this case, in order to facilitate removal of a portion of the positioning rib 220 extending out of the main body 301, the thickness of the positioning rib 220 is less than or equal to 1.3mm; in order to ensure that the positioning rib 220 has a good fixing effect on the core 200 during the in-mold injection molding process, the thickness of the positioning rib 220 is greater than or equal to 0.8mm. The thickness of the positioning rib 220 may be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm.

Referring to fig. 5 and 6 in combination, the present invention further proposes a stirrer, which includes a main body 301, stirring blades 303 extending outwards from the side of the main body 301, and a core 200 as described above, wherein the core 200 is located in the main body 301.

According to the stirrer provided by the invention, the core piece 200 is positioned in the main body part 301, the main body part 301 wraps the core piece 200, after the resin used for the main body part 301 is injection molded, the resin used for the main body part 301 is cooled and contracted, so that the core piece 200 is tightly wrapped, and the problem that the joint surface of the main body part 301 and the core piece 200 is easy to crack due to boiling water at high temperature is avoided.

Preferably, a plurality of stirring blades 303 are arranged at equal intervals, two adjacent stirring blades 303 and the main body part 301 are matched to form tooth grooves 304, the positioning ribs 220 extend towards the tooth grooves 304, and the tail ends of the positioning ribs 220 away from the base body part 210 are flush with the bottom of the tooth grooves 304.

The core 200 is placed in a cavity, and the resin used for the main body 301 is injected, and the positioning rib 220 protrudes outside the main body 301 in the product obtained by opening the mold after the resin is cured and molded. The portion of the positioning rib 220 extending out of the main body is cut off to obtain a reinforcing rib, and the reinforcing rib is flush with the outer edge of the main body to obtain the stirrer, preferably, the positioning protrusion or the positioning notch is located on the portion of the positioning rib 220 extending out of the main body 301. It should be noted that, the positioning rib 220 extends out of the main body 301, and the positioning rib 220 may extend from the tooth slot 304 between two adjacent stirring teeth or may extend from the stirring teeth.

The positioning rib 220 protrudes toward the tooth groove 304, and the end (free end) of the positioning rib 220 away from the base portion 210 is flush with the groove bottom of the tooth groove 304. When the positioning rib 220 extends towards the tooth groove 304, the end of the positioning rib 220 away from the base body 210 may be just flush with the groove bottom of the tooth groove 304, or may not reach the groove bottom of the tooth groove 304, i.e. the end of the positioning rib 220 away from the base body is located in the stirring body, or may be the position of the positioning rib 220 extending out of the groove bottom of the tooth groove 304, at this time, the part of the positioning rib 220 extending out of the groove bottom of the tooth groove 304 needs to be removed to obtain the reinforcing rib located in the main body 301. Of course, the positioning rib 220 may extend in the direction of the stirring teeth, and in this case, the positioning rib 220 may extend out of the stirring blade 303 in the radial direction of the stirrer (the portion extending out of the stirring blade 303 needs to be removed after the stirrer is molded), or the positioning rib 220 may not extend out of the stirring blade 303.

In the above technical solution, preferably, the outer diameter of the stirring teeth ranges from 76mm to 81mm. The external diameter of stirring tooth is more than or equal to 76mm and less than or equal to 81mm, can guarantee that the size of agitator is big enough to improve stirring effect. Preferably, the external diameter of the stirring teeth is 76mm, 77mm, 78mm, 79mm, 80mm, 81mm.

The base portion 210 has an elliptic cylindrical shape, and the magnetic member 215 is disposed in the longitudinal direction of the base portion 210. From the above, it will be understood that the number of the magnetic members 215 in the present application is two, the connecting line between the centers of the two magnetic members 215 is located in the long axis direction of the base portion 210, and the base portion 210 is designed into an elliptical cylinder shape, so that the contact area between the base portion 210 and the main portion 301 can be increased, and the main portion 301 can shrink after the stirrer is molded, so that the core member 200 can be tightly wrapped.

Further, the agitator further comprises a seat 420, the middle part of the main body 301 is abutted against the upper surface of the seat 420, and the magnetic member 215 is magnetically driven to rotate the main body 301 and the stirring blade 303 on the upper surface of the seat 420.

The seat 420 of the present embodiment is a flat disc structure, and the seat 420 is attached to the bottom wall of the container 520. By providing the seat cushion 420 in cooperation with the main body 301, the magnetic member 215 is driven by magnetic force to rotate the main body 301 and the stirring blade 303 on the upper surface of the seat cushion 420, and direct contact between the main body 301 and the container 520 is avoided due to the arrangement of the seat cushion 420, so that abrasion caused by friction in the rotation process of the stirrer is greatly reduced, and the service life of the stirrer is prolonged.

Preferably, the stirrer further comprises a handle 410 connected with the seat cushion 420, the main body 301 is provided with a shaft hole 305 corresponding to the hollow structure 211 of the core 200, the shaft hole 305 is in rotation fit with the handle 410, and the handle 410 passes through the shaft hole 305.

The handle 410 is cylindrical in shape having a length that does not impede the length of the handle 410 when the lid is used to close the container 520 during use of the breast milk machine 500. The handle 410 and the seat cushion 420 are of an integrated structure, the handle 410 is connected to the middle of the upper surface of the seat cushion 420, the handle 410 can be held by hand to integrally put the stirrer in the container 520 in the use process, and the stirrer can be taken out of the container 520 by the hand after the use process is finished. The handle 410 is convenient to use, and the stirrer can rotate around the handle 410 through the cooperation of the handle 410 and the shaft hole 305, so that the stirrer is stable in the rotation process.

In the present application, in order to further reduce the contact area between the main body 301 and the seat 420, one of the seat 420 and the main body 301 is provided with the boss 421, and the other of the seat 420 and the main body 301 is in contact with the boss 421, on the basis of the scheme that the seat 420 is provided to prevent the main body 301 from being worn out due to direct contact with the container 520.

In the present application, the boss 421 is preferably disposed in the middle of the upper surface of the seat cushion 420, wherein the thickness of the boss 421 may be about 1 to 2mm, the cross section of the boss 421 is circular, and the projection area on the horizontal plane is preferably capable of stably placing the main body 301, wherein the boss 421 and the seat cushion 420 are integrally formed and made of the same material as the seat cushion 420. In use, the body 301 of the stirring member contacts the boss 421 of the seat cushion 420, and by virtue of the boss 421, the contact area between the body 301 and the seat cushion 420 is further reduced, so that the abrasion between the body 301 and the seat cushion 420 can be further reduced.

The body 301 of the mixer of the present application rotates on the seat 420 without rotation between the seat 420 and the container 520, i.e., the coefficient of friction between the seat 420 and the container 520 is greater than the coefficient of friction between the body 301 and the seat 420. In order to achieve the above object, the seat cushion 420 of the present embodiment is further provided with an anti-slip structure, and when the main body 301 rotates on the seat cushion 420, the seat cushion 420 is relatively stationary to the container 520 by being connected to the bottom wall of the container 520 through the anti-slip structure.

According to the application, through the design of the anti-slip structure, the stirrer can be directly placed in the container 520 of the milk frothing machine 500, in the use process, the main body 301 of the stirrer and the seat cushion 420 rotate relative to each other, and the seat cushion 420 and the container 520 are relatively static, so that abrasion caused by friction between the stirrer and the container 520 can be avoided, and the service life of the stirrer is prolonged.

Specifically, the anti-slip structure includes a silicone pad 430 disposed on a side of the seat cushion 420 facing away from the main body 301. By the arrangement of the silica gel pad 430, the friction coefficient between the silica gel pad 430 and the bottom of the container 520 is larger than that between the main body 301 and the seat cushion 420, so that the seat cushion 420 can be prevented from rotating along with the main body 301 in the rotating process.

Referring to fig. 7, the present application further provides a milk frothing machine 500, where the milk frothing machine 500 includes a housing 510, a container 520 disposed in the housing 510 for containing liquid, a stirrer disposed in the container 520, and a driving device 530 disposed in the housing 510 and located below the container 520, wherein the driving device 530 includes a motor and a turntable, and magnetic blocks are disposed in the turntable, and the magnetic blocks are rotated by the motor and the turntable structure to form a rotating magnetic field, so as to drive the stirrer to rotate.

Preferably, the distance between the outer end of the stirring vane 303 and the side wall of the inner container 1 is 3.5mm to 6.5mm.

The distance between the outer end of the stirring vane 303 and the side wall of the container 520 is 3.5mm or more and 6.5mm or less, so that the size of the stirrer is increased and the stirring effect is enhanced while the stirrer can rotate in the container 520.

Referring to fig. 8 in combination, the present application further provides a method for manufacturing a stirrer, which is characterized in that the method includes the following steps:

step S110, the core piece 200 is manufactured by injection molding of a first mold, the core piece 200 is provided with a base body part 210 and a positioning rib 220 connected with the side wall of the base body part 210, a hollowed-out structure 211 is arranged in the middle of the base body part 210, and a containing groove 214 is concavely formed in the periphery of the hollowed-out structure 211 by the base body part 210;

step S120, embedding the magnetic member 215 into the accommodating groove 214;

Step S130, the core piece 200 with the magnetic piece 215 is positioned and fixed in the second injection mold by clamping the positioning ribs 220 and the hollow structure 211;

Step S140, carrying out encapsulation injection molding on the base body part 210 through a second die to obtain a stirrer blank piece with stirring blades 303;

step S150, cutting the positioning ribs 220;

In step S160, a shaft hole 305 is drilled at a position corresponding to the hollow structure 211 in the blank of the stirrer to obtain the stirrer.

Further, referring to fig. 9, after step S160, the method further includes:

in step S170, the handle 410 and the seat cushion 420 are integrally formed by injection molding with a third mold, and the handle 410 can be slidably inserted into the shaft hole 305.

The use of the stirrer is facilitated by making the stirrer bracket structure of handle 410 and seat 420 and cooperating with the stirrer structure having stirring blades 303.

Further, referring to fig. 10, after step S170, the method further includes:

in step S180, a silicone pad 430 integrally formed with the seat cushion 420 is injection molded on a side of the seat cushion 420 facing away from the handle 410.

In step S140, the material components used for the over-molding of the present application include: polyoxymethylene and polytetrafluoroethylene, wherein the mass ratio is: 95% polyoxymethylene and 5% polytetrafluoroethylene.

According to the manufacturing method of the stirrer, in the step S110, the injection molding temperature of the core piece 200 is 200 ℃ and the injection molding pressure is 60T through the first mold, in the step S140, the injection molding pressure of the second mold is 80T and the injection molding temperature is 210 ℃ during the encapsulation injection molding, the core piece 200 can be firmly wrapped by the injected molten material in the encapsulation injection molding process through the parameter setting, and the shrinkage of the encapsulation material is carried out, so that the core piece 200 is more compact, the obtained stirrer is firm in structure and smooth and seamless in surface. It should be noted that, in the manufacturing method of the stirrer of the present application, the injection molding temperature and injection molding pressure parameters of the first mold and the second mold may be left and right floating based on the above disclosed values, which are all within the scope of the present application.

Further, in the process of manufacturing the agitator support having the handle 410 and the seat cushion 420, in the step S170, the injection molding temperature of the third mold is 280 ℃, the injection molding pressure of the injection molding machine is 180T, and in the step S180, when the silica gel pad 430 is manufactured by performing the secondary injection molding on one side of the seat cushion 420 through the fourth mold, the mold temperature is 230 ℃, the injection molding pressure of the injection molding machine is 250T, and since the silica gel pad 430 will directly contact the inner container of the milk frothing machine during the use of the agitator, the silica gel pad 430 should be made of a high temperature resistant silica gel material, and meanwhile, the agitator support should also be made of a high temperature resistant material, so that the overall structural strength of the agitator is improved, and the service life of the agitator is prolonged.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. The core piece is used for a stirrer of a milk frothing machine and is characterized by comprising a base body part and a magnetic piece arranged in the base body part, wherein the base body part is columnar, the side wall of the base body part is provided with a positioning rib which extends outwards, and the middle part of the base body part is provided with a hollowed-out structure for positioning and fixing the core piece in an injection mold;

the hollow structure comprises a plurality of through holes formed in the middle of the base body part and a supporting table arranged in the area surrounded by the through holes, wherein the through holes are used for the flow of forming materials in the process of forming the stirrer, and the supporting table is used for assisting in positioning of the core piece.

2. The core member according to claim 1, wherein the base body portion is concavely formed with a receiving groove at a periphery of the through hole, and the magnetic member is received in the receiving groove.

3. The core member as claimed in claim 2, wherein the magnetic member is provided with at least two, the number of the receiving grooves is matched with the number of the magnetic members, and the magnetic members are uniformly spaced in the circumferential direction of the support table.

4. The core of claim 1, wherein the locating ribs are formed with locating protrusions or locating indentations.

5. The core according to claim 4, wherein the length of the positioning ribs ranges from 10mm to 15mm; and/or the thickness range value of the positioning rib is 0.8 mm-1.3 mm.

6. A mixer comprising a main body portion, mixing blades extending outwardly from the sides of the main body portion, and a core member according to any one of claims 1 to 5, the core member being located within the main body portion.

7. The mixer of claim 6 wherein a plurality of said mixing lobes are equally spaced, two adjacent mixing lobes and said main body portion cooperate to form a spline, said locating rib extends toward said spline, and the end of said locating rib remote from said main body portion is flush with the bottom of said spline.

8. The stirrer according to claim 6, wherein the outside diameter of the stirring blade ranges from 76mm to 81mm.

9. The mixer of claim 6 wherein said base portion is in the shape of an elliptical cylinder and the longitudinal direction of said base portion coincides with the direction of extension of the mixing blade;

The two magnetic pieces are arranged, and the connecting line of the centers of the two magnetic pieces is positioned in the long axis direction of the base body.

10. A beater according to any one of claims 6 to 9, further comprising a seat cushion, the central portion of the main body portion being in abutment with the upper surface of the seat cushion, the magnetic member being magnetically urged to rotate the main body portion and the mixing blades on the upper surface of the seat cushion.

11. The mixer of claim 10 further comprising a handle connected to said seat cushion, said body portion defining a shaft aperture in rotational engagement with said handle corresponding to the hollow structure of said core, said handle passing through said shaft aperture.

12. A mixer according to claim 11, wherein the seat cushion or the body portion is provided with a boss at the abutment of the two.

13. The agitator of claim 10, wherein the side of the seat facing away from the handle is further provided with a silicone pad.

14. A milk frother comprising a housing, a container disposed in the housing, a stirrer disposed in the container, and a driving device disposed below the container, wherein the stirrer is as claimed in any one of claims 6 to 13, and the driving device drives the main body and the stirring blade to rotate by magnetic force with a magnetic member.

15. A milk frother as claimed in claim 14 wherein the distance between the outer end of the stirring blade and the side wall of the vessel is 3.5mm to 6.5mm.

16. A method of manufacturing a stirrer, the method comprising the steps of:

Embedding a magnetic piece into the accommodating groove;

cutting the positioning ribs;

17. The method of manufacturing a mixer of claim 16, further comprising, after said step of drilling holes in said mixer blank at positions corresponding to support stations, the steps of: the handle and the seat cushion are manufactured through injection molding of a third die, and the handle can be arranged in the shaft hole in a sliding penetrating mode.

18. The method of manufacturing a mixer of claim 17 wherein said step of injection molding said handle and said seat cushion integrally with said third mold, said handle slidably passing through said shaft hole, further comprises: and a silica gel pad which is integrated with the seat cushion into a whole is injection molded on one side of the seat cushion, which is away from the handle.

19. The method of manufacturing a mixer of claim 18 wherein the step of overmolding the core having the magnetic element to produce a mixer blank having mixing lobes comprises the steps of: polyoxymethylene and polytetrafluoroethylene.