CN210169677U - Juicer with high-precision screw - Google Patents

Abstract

The utility model discloses a juice extractor that screw rod precision is high, including inside frame that has the motor, the juice collecting cavity of being connected with the frame, the screw rod of setting in the juice collecting cavity, the screw rod has spiral shell body, the screw rod axle of setting in the shell body including the surface, shell body one end is equipped with along axially extended first mounting hole, screw rod axle one end is the link of being connected with motor drive, and the other end is the assembly end that the cladding has the screw rod core, the assembly end is pegged graft in first mounting hole, and the screw rod core includes preceding location section and the back location section of adaptation in first mounting hole, is located before, the transmission section of back location section between can outside casing transmission moment of torsion, and the length of shell body is L, and the length of transmission section is S to 1/4 is less than or equal to S/L and is less than or equal to 5/8. The utility model discloses both made things convenient for the manufacturing of screw rod, can make higher axiality have again between screw shaft and the shell body, made the higher joint strength in order to transmit sufficient moment of torsion between screw shaft and the shell body simultaneously.

Description

Juicer with high-precision screw

Technical Field

The utility model belongs to the technical field of food preparation machine, especially, relate to a juice extractor that screw rod precision is high.

Background

Along with the improvement of living standard, various juicers continuously emerge, become the new pet of health preserving personage. The existing juice extractor is divided into a vertical type juice extractor and a horizontal type juice extractor, wherein the horizontal type juice extractor generally comprises a base, a juice collecting cavity, a screw rod and a feeding cylinder, the base is internally provided with a motor, the juice collecting cavity is transversely connected with the base, the screw rod is transversely arranged in the juice collecting cavity, and the feeding cylinder is arranged on the upper side of the juice collecting cavity. The screw rod includes the shell body and sets up the spiral on shell body surface, and the one end of shell body is the higher broken section of helical height, and the other end of shell body is the lower grinding section of helical height, and the feeding section of thick bamboo setting is in corresponding broken section position. When needing to squeeze juice, cut into the cubic with the fruit, the vegetables that need squeeze juice earlier, then throw into cubic material through a feeding section of thick bamboo and feed into the juice collecting cavity, starter motor, the motor drives the screw rod and rotates, and the higher spiral of broken section of screw rod can be sheared into the piece gradually with cubic fruit vegetables material and realize preliminary squeezing juice, and meanwhile, the spiral of broken section is with the fruit vegetables piece towards grinding section propelling movement. Due to the low spiral height of the grinding section, the juicing space between the juice collecting cavity and the outer shell body becomes relatively small. At the moment, the fruit and vegetable fragments are gradually squeezed to form fruit and vegetable juice and corresponding residues, the fruit and vegetable juice flows out from a juice outlet at the lower part of the juice collecting cavity, and the residues are discharged out from a residue outlet at the lower part of the juice collecting cavity.

In the prior art, the outer casing with the inner hole is usually made of stainless steel, ceramics and other materials to improve the wear resistance and food safety of the outer casing, and the screw shaft is made of stainless steel, so that the screw shaft is conveniently in transmission connection with the motor shaft to transmit torque and can meet the food sanitation requirement. To facilitate the connection between the screw shaft and the outer housing. A plastic screw core is typically provided between the screw shaft and the inner bore of the outer housing. Specifically, the screw core made of plastic needs to be molded by an injection molding process. During molding, the screw shaft and the outer shell are placed in a mold as inserts for positioning, and high-pressure molten plastic material is injected into a gap between the screw shaft and an inner hole of the outer shell. After the molten plastic is cooled and solidified, the screw shaft and the screw core can be fixedly connected together, thereby forming the screw with an integrated structure.

However, the existing screw structure and the corresponding manufacturing process have the following defects: firstly, when the screw core is molded and the shape and the size of the outer shell have errors, the positioning of the screw core in a mold can be influenced, so that the outer shell is crushed when the mold is closed; secondly, the screw core has a process of gradually cooling and shrinking during molding, so that a certain gap is formed between the screw core and the outer shell after molding, the connection strength between the screw core and the outer shell is influenced, and liquid enters the gap to form mildew.

To this end, screws are provided in a modular construction, with a screw core being molded onto a screw shaft and the screw shaft with the screw core being mounted in an inner bore of an outer housing. However, such structures and assembly processes still suffer from the following drawbacks: because the hole of shell body is the less deep hole in aperture, when the screw shaft assembled in the hole of shell body, be difficult to ensure the assembly precision of axiality between the two, and then cause the eccentricity between screw rod and the collection juice chamber, make the spiral of screw rod and the inside wall clearance of collection juice chamber one side too big, and the spiral of screw rod and the clearance undersize of collection juice chamber opposite side, and then influence the efficiency of squeezing the juice. In particular, the screw is easily jammed when hard fine particles are caught in the gap between the spiral and the inner wall of the juice collecting cavity.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a juice extractor that screw rod precision is high both makes things convenient for the manufacturing of screw rod, can make the higher axiality of having again between screw rod axle and the shell body to can ensure the efficiency of squeezing the juice of juice extractor, make simultaneously have higher joint strength between screw rod axle and the shell body in order to transmit sufficient moment of torsion.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a juice extractor that screw rod precision is high, has the frame of motor, the collection juice chamber of being connected with the frame including inside, transversely sets up the screw rod at collection juice intracavity, and the screw rod has spiral shell body, metal screw rod axle, the plastic screw rod core of setting in the shell body including the surface, shell body one end is equipped with along axially extended first mounting hole, and screw rod axle one end is the link of being connected with motor drive, and the other end is the cladding has the assembly end of screw rod core, the assembly end is pegged graft in first mounting hole, and the screw rod core includes preceding location section and the back location section of adaptation in first mounting hole, is located the transmission section that can transmit the moment of torsion to the shell body between location section and the back location section before, and the length of shell body is L, and the length of transmission section is S to 1/4 is less than or equal to S/L and is less than.

Firstly, the utility model discloses a screw rod adopts assembled structure, and the cladding of the screw core that the plastic was made is epaxial at the metal screw, becomes independent component respectively with the shell body. Therefore, the assembling end of the screw shaft coated with the screw core can be inserted into the first mounting hole of the outer shell, so that the screw is convenient to manufacture. Particularly, the screw core comprises a front positioning section and a rear positioning section which are matched in the first mounting hole, and a transmission section which can transmit torque to the outer shell, so that the front and rear positioning between the screw core and the first mounting hole is realized, and the coaxiality between the screw core and the first mounting hole can be ensured. It will be appreciated that the drive section may be of any non-circular configuration, such that the screw shaft may transmit torque to the outer housing through the screw core. Because the effect of transmission section lies in the transmission moment of torsion, consequently, can set up great radial fit-up clearance between transmission section and the first mounting hole, can greatly make things convenient for the assembly between screw shaft and the shell body, reduce the assembly precision requirement between first mounting hole and the screw rod core. That is to say, the whole screw core only has the front positioning section and the rear positioning section at the front end and the rear end to form matching with the first mounting hole for positioning.

Furthermore, the utility model discloses a rationally control the length of transmission section for the ratio between the length L of S and shell body, make the screw core can transmit sufficient moment of torsion, make things convenient for the manufacturing of shell body simultaneously, ensure the reliable positioning between the first mounting hole of screw core and shell body. When S/L < 1/4, it may result in the length of the drive section being too short, thereby making it difficult for the screw core to transmit sufficient torque to the outer housing. When the screw rod works, the phenomenon of slipping between the screw rod core and the outer shell easily occurs due to overload. When S/L > 5/8, can lead to the length overlength of screw core, the degree of depth of first mounting hole is too dark to increase the processing degree of difficulty of shell body, reduce the machining precision of first mounting hole, be unfavorable for the cooperation and the location of screw core and shell body.

Preferably, the outer side surface of the screw core transmission section is provided with a rotation stopping groove extending along the axial direction, a rotation stopping convex rib clamped in the rotation stopping groove is arranged in the first mounting hole, and the other end of the outer shell is provided with a fastener in threaded connection with the screw shaft at the assembling end.

Through the cooperation of the rotation stopping convex rib and the rotation stopping groove, the screw core can transmit enough torque to the outer shell, and the rotation stopping convex rib and the rotation stopping groove extend along the axial direction, so that the axial insertion between the rotation stopping convex rib and the rotation stopping groove is facilitated. In addition, the other end of the outer shell is provided with a fastener connected with the assembling end, so that the screw core is reliably positioned on the shaft pin, and the screw core is prevented from being separated from the first mounting hole of the outer shell. Particularly, the utility model discloses to spline the protruding muscle setting in the shell, consequently, be favorable to splines the shaping of protruding muscle in the pottery shell.

Preferably, the rear positioning section comprises a cylindrical positioning surface, and the bottom surface of the rotation stopping groove is not lower than the cylindrical positioning surface of the rear positioning section.

It will be appreciated that when the rear locating section comprises a cylindrical locating surface, the first mounting hole of the outer housing also comprises a section of cylindrical locating hole adapted to the cylindrical locating surface, thereby facilitating coaxial location therebetween. Because the bottom surface of the rotation stopping groove is not lower than the cylindrical positioning surface of the rear positioning section, correspondingly, the outer diameter of the cylindrical positioning surface of the rear positioning section is smaller than the inner diameter of the cylindrical surface of the top surface of the rotation stopping convex rib in the first mounting hole, and when the assembling end is inserted into the first mounting hole, the cylindrical positioning surface of the rear positioning section can be positioned in the cylindrical positioning hole in the first mounting hole smoothly through the rotation stopping convex rib.

Preferably, the clearance between the rotation stopping convex rib and the rotation stopping groove in the circumferential direction is α, and 0.2mm is not less than α mm not more than 0.8 mm.

The requirement on the manufacturing precision of the screw core and the outer shell can be reduced by reasonably arranging the gap α in the circumferential direction between the rotation stopping convex rib and the rotation stopping groove, the assembling end of the screw shaft can be conveniently installed and positioned in the first installing through hole of the outer shell, when α is less than 0.2mm, the manufacturing difficulty of the screw core and the outer shell can be greatly increased, meanwhile, the assembling between the assembling end of the screw shaft and the first installing through hole of the outer shell is not facilitated, when α is more than 0.8mm, an overlarge circumferential gap can be formed between the rotation stopping convex rib and the rotation stopping groove, when the screw shaft drives the outer shell to rotate through the screw core, the rotation stopping convex rib and the rotation stopping groove can form a tiny relative rotation to form impact, so that impact noise is generated, and the rotation stopping convex rib or the rotation stopping groove is easily damaged by impact.

Preferably, the other end of the outer shell is provided with a second mounting hole communicated with the first mounting hole, a shaft sleeve is fit in an opening of the second mounting hole, a screw through hole is formed in the shaft sleeve, and the fastening piece is a fastening screw arranged in the screw through hole.

The bushing provides a cushioning effect between the fastening screw and the outer casing, and in particular, when the outer casing is made of a hard and brittle material such as ceramic, crushing of the outer casing upon tightening of the fastening screw is effectively avoided. In addition, the sleeve may be made of a material such as plastic having a certain elasticity to improve the sealing between the fastening screw and the outer casing, thereby preventing external liquid from entering the inside of the outer casing.

Preferably, the front positioning section of the screw core is provided with a plurality of grooves axially extending to the transmission section, the grooves are uniformly distributed in the circumferential direction, and the bottom surfaces of the grooves are flush with the surface of the transmission section.

The groove can remarkably reduce the contact area between the front positioning section and the first mounting hole, and is favorable for matching and positioning the front positioning section and the first mounting hole. In particular, the bottom surface of the recess is flush with the surface of the drive section, so that a step is formed between the front positioning section and the drive section. Like this, when the assembly end of screw shaft is pegged graft in first mounting hole, can have a clearance radially between transmission section and the first mounting hole to make things convenient for the assembly between the two, reduce the size precision requirement of transmission section and first installation through-hole simultaneously.

Preferably, the rear positioning section of the screw core is provided with a plurality of first separation grooves axially penetrating through two ends of the rear positioning section, and the first separation grooves are uniformly distributed in the circumferential direction, so that an inner positioning convex rib is formed between adjacent separation grooves.

The first partition groove can remarkably reduce the contact area between the rear positioning section and the first mounting hole, and is favorable for matching and positioning the rear positioning section and the first mounting hole. Particularly, the first separating groove penetrates through two ends of the rear positioning section along the axial direction, so that the plastic mold for forming the screw rod core is formed in a simple axial parting mode, the structure of the plastic mold can be greatly simplified, and the manufacturing cost is reduced.

Preferably, a sealing counter bore is arranged at the opening of the first mounting hole, a sealing convex ring limited in the sealing counter bore is arranged at the corresponding position of the front positioning section of the screw core, an extrusion chamfer is arranged at the junction of the first mounting hole and the sealing counter bore, and a sealing ring is arranged at the joint of the front positioning section and the sealing convex ring.

The sealing washer can avoid external liquid to get into in the shell through the gap between preceding location section and the first installation through-hole. It can be understood that the extrusion chamfer at the junction of the first mounting hole and the sealing counterbore is a conical surface, and when the assembling end of the screw shaft is axially fixed in the first mounting hole through a fastener, the sealing convex ring can axially extrude the sealing ring, so that the sealing ring is tightly attached to the extrusion chamfer to form sealing at the opening of the screw core and the first mounting hole. In particular, the pressing of the chamfered conical surface results in an axial component and a radial inward pressing force on the sealing ring, the axial component ensures the sealing effect between the sealing convex ring and the sealing counter bore, and the radial inward pressing force enables the inner side of the sealing ring to tightly abut against the outer side wall of the front positioning section of the screw rod core, so that radial sealing is formed. That is, the extrusion chamfer enables the seal ring to achieve double sealing of the end face and the circumferential face.

Preferably, the second mounting hole comprises a positioning round hole at the opening and a regular polygon rotation stopping hole connected with the positioning round hole, and the shaft sleeve comprises a positioning section matched with the positioning round hole and a rotation stopping section matched with the rotation stopping hole.

The rotation stopping holes in the regular polygon are matched with the rotation stopping sections, so that the shaft sleeve can be accurately positioned in the second mounting hole in the circumferential direction, and the shaft sleeve is prevented from being driven to rotate together when the fastening screw is screwed down.

Preferably, a plurality of second separating grooves axially penetrating through two ends of the positioning section are formed in the circumferential surface of the positioning section, so that a positioning convex rib is formed between the adjacent second separating grooves, and the radius of the bottom surface of each second separating groove is larger than the radius of the circumscribed circle of the rotation stopping section.

The second separation groove can remarkably reduce the contact area between the positioning section and the positioning round hole, and is favorable for matching and positioning the positioning section and the positioning round hole. Because the radius of the bottom surface of the second separating groove is larger than the radius of the circumscribed circle of the rotation stopping section, the cross section of the rotation stopping section is completely positioned in the end surface formed by the circle of the bottom surface of the second separating groove, so that the positioning section and the rotation stopping section form a reduced step, and the molding formation of the shaft sleeve and the assembly in the second mounting hole are facilitated.

Therefore, the utility model discloses following beneficial effect has: the processing and manufacturing of the screw rod are facilitated, the screw rod shaft and the outer shell body can have high coaxiality, the juice squeezing efficiency of the juice squeezer can be guaranteed, and meanwhile the screw rod shaft and the outer shell body have high connection strength so as to transmit enough torque.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of a screw structure.

Fig. 3 is a schematic view of a screw shaft.

Fig. 4 is a schematic diagram of a structure of the outer housing.

FIG. 5 is a schematic cross-sectional view of a screw.

Fig. 6 is a schematic structural view of the bushing.

In the figure: 1. the juice collecting cavity 3 is provided with a base 11, a motor 2, a juice collecting cavity 3, a screw 31, an outer shell 311, a first mounting hole 312, a second mounting hole 313, a rotation stopping convex rib 314, a sealing counter bore 315, an extrusion chamfer 316, a cylindrical positioning hole 32, a screw shaft 321, a connecting end 322, an assembling end 33, a screw core 331, a front positioning section 332, a rear positioning section 333, a transmission section 334, a rotation stopping groove 335, a cylindrical positioning surface 336, a groove 337, a first separating groove 338, a sealing convex ring 4, a fastener 5, a shaft sleeve 51, a positioning section 511, a second separating groove 52, a rotation stopping section 6 and a sealing ring.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

As shown in figure 1, the juicer with the high-precision screw comprises a base 1, a juice collecting cavity 2 and a screw 3, wherein the motor 11 is arranged in the base, the juice collecting cavity is connected with the base, the screw is transversely arranged in the juice collecting cavity, the screw comprises a ceramic outer shell 31 and a metal screw shaft 32 arranged in the outer shell, a spiral is arranged on the surface of the outer shell, and the outer shell can be made of stainless steel or other materials with higher hardness and meeting the food sanitation requirements. As shown in fig. 2, 3 and 4, one end of the screw shaft is a connecting end 321 connected with the motor in a transmission way, and the other end is an assembling end 322 assembled with the outer shell. In addition, a plastic screw core 33 is wrapped around the mounting end of the screw shaft. The screw core can be connected with the screw shaft into a whole through an injection molding process. In addition, a first mounting hole 311 extending along the axial direction is formed in one end of the outer shell, the assembling end of the screw shaft is inserted into the first mounting hole, the screw core comprises a front positioning section 331 adapted to the outer end of the first mounting hole, a rear positioning section 332 adapted to the inner end of the first mounting hole, and a transmission section 333 positioned between the front positioning section and the rear positioning section and capable of transmitting torque to the outer shell, wherein the front positioning section and the rear positioning section are used for positioning front and rear points between the screw core and the first mounting hole to ensure the coaxiality between the screw core and the first mounting hole, further ensure the coaxiality between the screw shaft and the outer shell, and avoid the generation of impact noise caused by the fit clearance between the screw core and the first mounting hole when the screw rotates.

It will be appreciated that the drive section may be of any non-circular configuration, such as a regular polygon, or that parallel flats may be provided on either side of a cylindrical drive section, so that the screw shaft may transmit torque through the screw core to the outer housing.

Preferably, 4 axially extending rotation stop grooves 334 are provided on the outer side of the screw core drive section, the rotation stop grooves are evenly distributed in the circumferential direction, and the bottom surfaces of the rotation stop grooves are on the same cylindrical surface coaxial with the screw shaft. Set up 4 screens in the groove of splining the commentaries on classics of splining 313 in the first mounting hole corresponds transmission section department to make things convenient for axial grafting between the two, thereby make the screw core can transmit very big moment of torsion to the shell body, be favorable to reducing the size of screw core. Of course, the top surface of the rotation stopping convex rib is positioned on the same cylindrical surface coaxial with the first mounting hole.

In addition, the other end of the outer shell is provided with a fastener 4 in threaded connection with the screw shaft of the assembling end, so that the screw core is reliably positioned on the shaft pin, and the screw core is prevented from being separated from the first mounting hole of the outer shell.

In the present embodiment, one end of the opening of the first mounting hole is referred to as an outer end, and one end far from the opening and extending into the outer housing is referred to as an inner end.

Further, we can control the ratio between the length S of the transmission section and the length L of the outer housing in the following range: 1/4 ≦ S/L ≦ 5/8, with preferred values: s =51mm and L =130mm, so as to provide the transmission section of the screw core with a sufficient length to transmit a sufficient torque to the outer casing, while minimizing the length of the transmission section and the depth of the corresponding second mounting hole, so as to facilitate the manufacture of the ceramic outer casing and improve the precision of the first mounting hole of the outer casing, thereby ensuring reliable positioning between the screw core and the first mounting hole.

As a preferable scheme, the rear positioning section includes a cylindrical positioning surface 335, and the first mounting hole of the outer housing includes a section of cylindrical positioning hole 316 adapted to the cylindrical positioning surface, so as to facilitate coaxial positioning therebetween and facilitate insertion of the screw shaft in the first mounting hole in any direction. In addition, the bottom surface of the rotation stopping groove is not lower than the cylindrical positioning surface of the rear positioning section, so that the outer diameter of the cylindrical positioning surface of the rear positioning section is smaller than the inner diameter of the cylindrical surface of the top surface of the rotation stopping convex rib in the first mounting hole. When the assembling end of the screw shaft is inserted into the first mounting hole, the cylindrical positioning surface of the rear positioning section can be positioned in the cylindrical positioning hole in the first mounting hole smoothly through the rotation stopping convex rib.

In addition, a plurality of grooves 336 extending axially to the transmission section can be formed in the front positioning section of the screw core, and the grooves are uniformly distributed in the circumferential direction, so that convex ribs are formed between adjacent grooves, and the bottom surfaces of the grooves are flush with the surface of the transmission section. That is, we understand that the cylindrical surface of the transmission section extends to the front positioning section, and then a plurality of convex ribs are arranged on the front surface of the front positioning section. Therefore, on one hand, the contact area of the front positioning section and the first mounting hole can be obviously reduced, and the matching and positioning of the front positioning section and the first mounting hole are facilitated. On the other hand, a step is formed between the front positioning section and the transmission section. Like this, when the assembly end of screw shaft is pegged graft in first mounting hole, can have a clearance radially between transmission section and the first mounting hole to make things convenient for the assembly between the two, reduce the size precision requirement of transmission section and first installation through-hole simultaneously.

Similarly, a plurality of first separation grooves 337 can be arranged on the rear positioning section of the screw core and are uniformly distributed in the circumferential direction, so that positioning convex ribs are formed between adjacent separation grooves, the contact area between the rear positioning section and the first mounting hole can be obviously reduced, and the cooperation and the positioning of the rear positioning section and the first mounting hole are facilitated. Particularly, the first separating groove penetrates through two ends of the rear positioning section along the axial direction, so that the plastic mold for forming the screw rod core is formed in a simple axial parting mode, the structure of the plastic mold can be greatly simplified, and the manufacturing cost is reduced.

Preferably, as shown in FIG. 5, the circumferential gap α between the rotation stopping ribs and the rotation stopping grooves can be controlled within the range of 0.2mm & lt α & lt 0.8mm, so that the requirement on the manufacturing precision of the screw core and the outer shell is reduced, the torque transmission of the screw shaft to the outer shell is not influenced, and the mounting end of the screw shaft is conveniently mounted and positioned in the first mounting through hole of the outer shell.

Further, we can set up second mounting hole 312 at the other end that first mounting hole was kept away from to the shell body, of course, the second mounting hole should communicate and coaxial arrangement with first mounting hole, be fit with plastic axle sleeve 5 in the opening of second mounting hole, be equipped with the screw via hole of echelonment in the axle sleeve, set up fastening screw in the screw via hole, thereby constitute aforementioned fastener, fastening screw's tail end passes second mounting hole and the assembly end tip threaded connection of screw shaft, the axle sleeve can make and form a cushioning effect between fastening screw and the shell body this moment, with ceramic shell body crushing when avoiding fastening screw to tighten. It should be noted that the mounting end of the screw shaft may extend beyond the screw core.

In order to improve the sealing performance between the screw core and the first mounting hole, a sealing counter bore 314 may be disposed at an opening of the first mounting hole, a sealing convex ring 338 limited in the sealing counter bore is disposed at a corresponding position of a front positioning section of the screw core, an extrusion chamfer 315 is disposed at a junction of the first mounting hole and the sealing counter bore, and a sealing ring 6 is sleeved at a connection position of the front positioning section and the sealing convex ring. When the assembling end of the screw shaft is inserted into the first mounting hole and the screw shaft is axially fixed in the first mounting through hole by the fastening piece, the sealing convex ring can axially extrude the sealing ring, one side of the sealing ring at the moment is tightly attached to the sealing convex ring, the other side of the sealing ring is attached to the conical surface of the extrusion chamfer, the conical surface of the extrusion chamfer forms an inclined centripetal acting force towards the sealing ring, the acting force can be decomposed into an axial component force and a radial inward extrusion force, the axial component force can ensure the sealing effect between the sealing convex ring and the sealing counter bore, and the radial inward extrusion force can enable the inner side of the sealing ring to be tightly attached to the outer side wall of the front positioning section of the screw core, so that radial sealing is formed, and the sealing ring can realize double sealing of the end face and the circumferential face.

In order to reliably position and mount the shaft sleeve in the second mounting hole, the second mounting hole may include a positioning circular hole at the opening and a regular hexagon rotation stopping hole connected to the positioning circular hole, and accordingly, as shown in fig. 6, the shaft sleeve includes a positioning section 51 adapted to the positioning circular hole and a regular hexagon rotation stopping section 52 adapted to the rotation stopping hole, and the regular hexagon rotation stopping section has a circumscribed circle. When the shaft sleeve is installed in the second installation hole, the shaft sleeve can be centered and positioned through the matching of the positioning section and the positioning round hole, the rotation stopping hole of the regular polygon and the matching of the rotation stopping section can enable the shaft sleeve to be accurately positioned in the second installation hole in the circumferential direction, and the shaft sleeve is driven to rotate together when the fastening screw is prevented from being screwed down.

Preferably, a plurality of second separating grooves 511 which axially penetrate through two ends of the positioning section can be further arranged on the circumferential surface of the positioning section, and the bottom surfaces of the second separating grooves are positioned on the same cylindrical surface, so that a positioning convex rib is formed between the adjacent second separating grooves, the contact area between the positioning section and the positioning round hole is reduced, and the matching and the positioning of the positioning section and the positioning round hole are facilitated. In addition, the radius of the bottom surface of the second separation groove is larger than the radius of the circumscribed circle of the rotation stopping section, so that the cross section of the rotation stopping section is completely positioned in the end surface formed by the circle of the bottom surface of the second separation groove, the positioning section and the rotation stopping section form a reduced step, and the molding and the assembly of the shaft sleeve in the second mounting hole are facilitated.

In addition to the preferred embodiments described above, other embodiments of the present invention are also possible, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope of the present invention defined by the appended claims.

Claims (10)

1. The utility model provides a juice extractor that screw rod precision is high, has the frame of motor, the collection juice chamber of being connected with the frame including inside, transversely sets up the screw rod at the juice intracavity, and the screw rod has spiral shell body, metal screw rod axle, plastic screw rod core of setting in the shell body including the surface, characterized by, shell body one end is equipped with along the first mounting hole of axial extension, and screw rod axle one end is the link of being connected with motor drive, and the other end is the cladding the assembly end of screw rod core, the assembly end is pegged graft in first mounting hole, and the screw rod core includes preceding location section and the back location section of adaptation in first mounting hole, is located the transmission section that can outside casing transmission moment of torsion between location section and the back location section, and the length of shell body is L, and the length of transmission section is S to 1/4 is less than or equal to S/L and is less than or equal to.

2. The juicer according to claim 1, wherein the outer side surface of the screw core transmission section is provided with a rotation stopping groove extending along the axial direction, the first mounting hole is internally provided with a rotation stopping rib clamped in the rotation stopping groove, and the other end of the outer shell is provided with a fastener in threaded connection with the screw shaft at the assembling end.

3. The juicer with the high-precision screw rod as claimed in claim 2, wherein the rear positioning section comprises a cylindrical positioning surface, and the bottom surface of the rotation stopping groove is not lower than the cylindrical positioning surface of the rear positioning section.

4. The juicer of claim 2, wherein the circumferential gap between the rotation stop rib and the rotation stop groove is α mm, and 0.2mm or more and α or less and 0.8mm or less.

5. The juicer according to claim 2, wherein the other end of the outer casing is provided with a second mounting hole communicated with the first mounting hole, a shaft sleeve is fitted in an opening of the second mounting hole, a screw passing hole is formed in the shaft sleeve, and the fastening member is a fastening screw arranged in the screw passing hole.

6. The juicer of claim 1, wherein the front positioning section of the screw core is provided with a plurality of grooves extending axially to the transmission section, the grooves are uniformly distributed in the circumferential direction, and the bottom surfaces of the grooves are flush with the surface of the transmission section.

7. The juicer according to claim 1, wherein the rear positioning section of the screw core is provided with a plurality of first separation grooves axially penetrating through two ends of the rear positioning section, and the first separation grooves are uniformly distributed in the circumferential direction, so that an inner positioning rib is formed between adjacent separation grooves.

8. The juicer according to claim 3, wherein a sealing counter bore is formed at the opening of the first mounting hole, a sealing convex ring limited in the sealing counter bore is arranged at the corresponding position of the front positioning section of the screw core, an extrusion chamfer is arranged at the junction of the first mounting hole and the sealing counter bore, and a sealing ring is arranged at the junction of the front positioning section and the sealing convex ring.

9. The juicer with the high-precision screw rod as claimed in claim 5, wherein the second mounting hole comprises a positioning round hole at the opening and a regular polygon rotation stopping hole connected with the positioning round hole, and the shaft sleeve comprises a positioning section matched with the positioning round hole and a rotation stopping section matched with the rotation stopping hole.

10. The juicer according to claim 9, wherein the circumferential surface of the positioning section is provided with a plurality of second separating grooves axially penetrating through both ends of the positioning section, so that a positioning rib is formed between adjacent second separating grooves, and the radius of the bottom surface of each second separating groove is larger than the radius of the circumscribed circle of the rotation stopping section.

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