CN108371484B - Coffee machine and method for operating a coffee machine - Google Patents

Abstract

The invention provides a coffee machine and a working method of the coffee machine, wherein the coffee machine comprises a brewing unit and a bean grinding unit, the brewing unit comprises a coffee brewing box and a pressing part, and the top of the coffee brewing box is provided with an opening; the pressing part is positioned above the coffee brewing box and can move up and down along the vertical direction. The bean grinding unit comprises a grinding body, a bean grinding cavity is arranged in the grinding body, and the bean grinding cavity is provided with a powder outlet. The powder outlet is provided with a powder feeding pipeline, the fixed end of the powder feeding pipeline is arranged on the mill body, the free end of the powder feeding pipeline is positioned between the opening of the coffee brewing box and the pressing part, and the free end of the powder feeding pipeline is made of flexible materials. After the coffee powder is sent to the coffee brewing box by the bean grinding unit, the pressing part presses the powder sending pipeline and seals the coffee powder outlet, so that the wetting and bonding of the pipeline and the coffee powder in the bean grinding cavity are prevented.

Description

Coffee machine and method for operating a coffee machine

Technical Field

The invention relates to the field of coffee machines, in particular to a coffee machine and a working method of the coffee machine.

Background

The powder feeding pipeline of the existing coffee machine is made of hard materials, the end part of the powder feeding pipeline cannot be sealed after the coffee powder is fed into the coffee brewing box, water easily enters the powder feeding pipeline and the powder feeding pipeline enters the bean grinding cavity, and residual coffee powder in the pipeline and the bean grinding cavity is affected with damp and is bonded.

Disclosure of Invention

The invention mainly aims to provide a coffee machine for preventing coffee powder from being wetted and adhered.

Another object of the present invention is to provide a method of operating the above coffee machine.

In order to achieve the main purpose, the invention provides a coffee machine, which comprises a brewing unit and a bean grinding unit, wherein the brewing unit comprises a coffee brewing box and a pressing part, and the top of the coffee brewing box is provided with an opening; the pressing part is positioned above the coffee brewing box and can move up and down along the vertical direction. The bean grinding unit comprises a grinding body, a bean grinding cavity is arranged in the grinding body, and the bean grinding cavity is provided with a powder outlet. The powder outlet is provided with a powder feeding pipeline, the fixed end of the powder feeding pipeline is arranged on the mill body, the free end of the powder feeding pipeline is positioned between the opening of the coffee brewing box and the pressing part, the fixed end of the powder feeding pipeline is higher than the free end of the powder feeding pipeline, and the free end of the powder feeding pipeline is made of flexible materials.

According to the scheme, after the coffee powder is sent into the coffee brewing box by the bean grinding unit, the pressing part moves downwards and presses the powder sending pipeline, and a coffee powder outlet at the free end of the powder sending pipeline is sealed. When the coffee powder is required to be continuously sent into the coffee brewing box, the pressing part moves upwards to enable the powder sending pipeline to recover the shape under the action of elastic restoring force, and the coffee powder outlet is opened, so that the coffee powder is sent. The compacting component is matched with the powder feeding pipeline to prevent the pipeline and coffee powder in the bean grinding cavity from being wetted and adhered.

In a preferred embodiment, the brewing unit further comprises a base, the coffee brewing cartridge is mounted in the base, and the free end of the deformed powder feeding tube is located between the compacting member and the base.

Therefore, the coffee powder outlet at the free end of the powder feeding pipeline is tightly pressed between the pressing part and the peripheral wall of the coffee brewing box, and a good sealing effect can be realized.

The bean grinding unit further comprises a bean box, the bean box comprises a barrel body and an installation part located at one axial end of the barrel body, the installation part is connected with the grinding body through threads, an elastic clamping device is arranged on the barrel body, one end of the elastic clamping device is fixed on the barrel body, and the other end of the elastic clamping device is abutted to the grinding body.

In order to achieve the main purpose, the invention also provides a coffee machine, which comprises a brewing unit and a bean grinding unit, wherein the brewing unit comprises a coffee brewing box and a pressing part, the top of the coffee brewing box is provided with an opening, the pressing part is positioned above the coffee brewing box and can move up and down along the vertical direction, the bottom wall of the pressing part is tightly matched with the peripheral wall of the coffee brewing box, the bean grinding unit comprises a grinding body, a bean grinding cavity is arranged in the grinding body, and the bean grinding cavity is provided with a powder outlet; the powder outlet is provided with a powder feeding pipeline, the fixed end of the powder feeding pipeline is arranged on the mill body, the fixed end of the powder feeding pipeline is higher than the free end of the powder feeding pipeline, the pressing part is abutted to the free end of the powder feeding pipeline, and the coffee powder outlet at the free end of the powder feeding pipeline is closed.

In a preferred embodiment, the brewing unit further comprises a base, the coffee brewing cartridge is mounted in the base, and the free end of the powder feeding tube is located between the compacting member and the base.

The bean grinding unit also comprises a bean box, wherein the bean box comprises a barrel body and a mounting part positioned at one axial end of the barrel body, and the mounting part is connected with the grinding body through threads; an elastic clamping device is arranged on the cylinder body, one end of the elastic clamping device is fixed on the bean box, and the other end of the elastic clamping device is abutted on the grinding body.

Therefore, the bean box is detachably and fixedly connected with the grinding body, and the recovery of coffee beans in the bean box and the cleaning of the bean box can be conveniently realized. In addition, the elastic clamping device is convenient to realize tight fit between the bean box and the grinding body.

The elastic clamping device comprises a cover part, an elastic piece and a fixed column, wherein the cylinder body is provided with a mounting groove, the elastic piece and the fixed column are positioned in the mounting groove, and the cover part is arranged on the top wall of the mounting groove; the both ends of elastic component butt respectively on lid and fixed column, and the bottom of fixed column has columnar butt portion, and the diameter of butt portion is less than the diameter of fixed column, and butt portion passes the diapire of mounting groove and butt on the mill body.

Therefore, when the bean box is rotationally fastened, the fixing column is always abutted on the grinding body, so that the bean box is ensured to be fixedly connected with the grinding body all the time in the rotating process.

Still further, the top wall of the grinding body is provided with a plurality of constant head tanks evenly arranged along the circumference of the grinding body, the abutting part is abutted in one of the constant head tanks, the outer peripheral wall of one end of the cylinder body, which is close to the installation part, is provided with a stop part extending outwards along the radial direction of the cylinder body, and the stop part covers the upper part of the constant head tank.

Therefore, when the positioning groove is arranged to facilitate the rotation and fastening of the bean box, the abutting part is positioned to prevent the abutting part from sliding on the top wall of the mill body, and in addition, dust or other sundries can be prevented from entering the positioning groove by the arrangement of the stop part, so that the screwing process of the bean box is not smooth.

The soybean grinding unit further comprises a motor and an upper soybean grinding wheel, a lower soybean grinding wheel and a lower soybean grinding wheel mounting frame which are coaxially arranged, wherein the motor is arranged below the soybean grinding cavity, a driving shaft of the motor stretches into the soybean grinding cavity, the upper soybean grinding wheel, the lower soybean grinding wheel and the lower soybean grinding wheel mounting frame are positioned in the soybean grinding cavity, the lower soybean grinding wheel mounting frame is fixedly connected with the driving shaft, the upper soybean grinding wheel is fixed at the bottom of the mounting part, and the lower soybean grinding wheel is fixed on the lower soybean grinding wheel mounting frame.

Therefore, the upper bean grinding wheel is detachably and fixedly connected with the bean box, the lower bean grinding wheel is detachably and fixedly connected with the lower bean grinding wheel mounting frame, and the upper bean grinding wheel and the lower bean grinding wheel are convenient to clean and assemble.

In order to achieve the above another object, the present invention provides a method for operating a coffee machine, wherein the coffee machine comprises the following steps:

the bean grinding unit grinds the coffee beans into coffee powder;

the coffee powder enters the coffee brewing box from the bean grinding cavity through the powder feeding pipeline;

the pressing part moves downwards until the pressing part is tightly matched with the coffee brewing box, the pressing part applies pressure to the free end of the powder feeding pipeline, the free end of the powder feeding pipeline is deformed, and the coffee powder outlet is sealed;

high pressure hot water is injected into the coffee brewing cartridge.

Drawings

Fig. 1 is a schematic view of a coffee machine according to an embodiment of the present invention after concealing the coffee machine housing.

Fig. 2 is a cross-sectional view of an embodiment of the coffee maker of the present invention after concealing the coffee maker housing.

Fig. 3 is an exploded view of the structure of the bean grinding unit in the embodiment of the coffee maker of the present invention.

Fig. 4 is a schematic view of the structure of the bean box in the embodiment of the coffee maker of the present invention.

Fig. 5 is a cross-sectional view of a bean grinding unit in an embodiment of the coffee maker of the present invention.

Fig. 6 is an exploded view of the structure of the exchange means of the coffee brewing cartridge in an embodiment of the coffee maker of the present invention.

Fig. 7 is a schematic view of the structure of the pressing device in the releasing position in the coffee maker according to the embodiment of the present invention.

Fig. 8 is a schematic view of the pressing device in a pressing position in an embodiment of the coffee maker of the present invention.

Fig. 9 is a cross-sectional view of a sleeve ram in an embodiment of a coffee maker of the present invention.

Fig. 10 is an exploded view of the structure of the sleeve ram in an embodiment of the coffee maker of the present invention.

Fig. 11 is an exploded view of the structure of the coffee capsule brewing cartridge in an embodiment of the coffee maker of the present invention.

Fig. 12 is a cross-sectional view of a coffee capsule brewing cartridge, cartridge mount and compression device in an embodiment of a coffee machine of the present invention.

The invention is further described below with reference to the drawings and examples.

Detailed Description

Referring to fig. 1, the coffee maker of the present embodiment includes a brewing unit 1 and abean grinding unit 5, thebean grinding unit 5 is used for grinding coffee beans into coffee powder, and the brewing unit 1 is used for brewing the coffee powder made by thebean grinding unit 5 into coffee liquid.

Referring to fig. 2 to 5, thebean grinding unit 5 includes a grinding body assembly including a grindingbody 51, amotor 54, and upper and lowerbean grinding wheels 71, 72 and a lower bean grindingwheel mounting frame 73 coaxially disposed, and abean box 52. Thegrinding body 51 is provided with agrinding chamber 511, and thebean box 52 includes acylindrical body 521 and amounting portion 522 at one axial end of thecylindrical body 521, themounting portion 522 being screwed with the grindingbody 51. Thecylinder 521 is provided with two elastic clamping devices which are symmetrically arranged relative to the central axis of thebean box 52. One end of the elastic clamping device is fixed on thebean box 52, and the other end of the elastic clamping device is abutted on the grindingbody 51.

The elastic clamping device comprises acover member 61, anelastic member 62 and afixing column 63, wherein amounting groove 5211 is formed in thecylinder 521, theelastic member 62 and thefixing column 63 are located in themounting groove 5211, and thecover member 61 is mounted on the top wall of themounting groove 5211. Both ends of theelastic member 62 are respectively abutted against thecover member 61 and thefixing post 63. Preferably, theelastic member 62 is a spring. The bottom end of thefixed post 63 has acolumnar abutment portion 64, the diameter of theabutment portion 64 is smaller than that of thefixed post 63, and theabutment portion 64 passes through the bottom wall of themounting groove 5211 and abuts against thegrinding body 51. The top wall of thegrinding body 51 is provided with a plurality ofpositioning grooves 512 uniformly arranged along the circumferential direction of thegrinding body 51, theabutting part 64 abuts in one of thepositioning grooves 512, the outer circumferential wall of one end of thecylinder 521, which is close to themounting part 522, is provided with astop part 523 extending outwards along the radial direction of thecylinder 521, and thestop part 523 covers the upper part of thepositioning groove 512. The lower end of the abuttingportion 64 is hemispherical, the shape of thepositioning groove 512 is matched with the shape of the lower end of the abuttingportion 64, and the upper periphery of thepositioning groove 512 is in arc transition with the top wall of thegrinding body 51.

Themotor 54 is arranged below thebean grinding cavity 511, adriving shaft 541 of themotor 54 extends into thebean grinding cavity 511, an upperbean grinding wheel 71, a lowerbean grinding wheel 72 and a lower bean grindingwheel mounting frame 73 are positioned in thebean grinding cavity 511, the lower bean grindingwheel mounting frame 73 is detachably and fixedly connected with thedriving shaft 541 through threads, amounting groove 5221 is formed in the bottom of themounting portion 522, the upper bean grindingwheel 71 is detachably fixed in themounting groove 5221 through a plurality of first screws, the lower bean grindingwheel 72 is detachably fixed on the lower bean grindingwheel mounting frame 73 through a plurality of second screws, and the upper bean grindingwheel 71 and the lower bean grindingwheel 72 are arranged up and down oppositely. The coffee maker can adjust the size of the gap between the upper andlower grinding wheels 71, 72 by rotating thebean box 52, thereby achieving the adjustment of the thickness of the coffee powder.

Thebean grinding cavity 511 is provided with apowder outlet 513 on one side close to the brewing unit 1, apowder feeding pipeline 55 is arranged at thepowder outlet 513, the fixed end of thepowder feeding pipeline 55 is arranged on the grindingbody 51, and the free end of thepowder feeding pipeline 55 is positioned between the opening of thecoffee brewing box 3 and the pressing part. The pressing member in this embodiment is a sleeve pressinghead 251 of thepressing device 25, and the structure thereof will be described in detail later. The fixed end of thepowder feeding pipe 55 is located higher than the free end of thepowder feeding pipe 55. Preferably, thepowder feeding pipe 55 is made of a flexible material such as silicone rubber. The compacting member is able to move downwards and to drive the deformation of the free end of thepowder feeding duct 55, when the bottom wall of the compacting member is in close fit with the peripheral wall of thecoffee brewing cartridge 3, the compacting member abuts against the free end of thepowder feeding duct 55 to seal thecoffee powder outlet 552 of the free end of thepowder feeding duct 55.

As shown in fig. 3, at least two fixingprotrusions 514 are provided on the outer wall of thepowder outlet 513, mountingholes 551 are provided on thepowder feeding pipe 55 at positions corresponding to the fixingprotrusions 514, and the fixingprotrusions 514 are inserted into the mountingholes 551 to fix thepowder feeding pipe 55 on the grindingbody 51.

Referring to fig. 6 to 8, the brewing unit 1 comprises an exchange means of the coffee brewing cartridge comprising abase 21, a cartridge mount, thecoffee brewing cartridge 3 and a compacting means 25.

Thecoffee brewing cartridge 3 in fig. 2 and 6-8 is used for containing coffee powder, the top periphery of thecoffee brewing cartridge 3 is turned outwards to form a mountingpart 31, the mountingpart 31 is positioned at the top of the peripheral wall of the cartridgebody accommodating cavity 221, and thepressing device 25 is abutted on the mountingpart 31.

Thebase 21 has atop opening 211 and aside opening 212, the cartridge mount has acartridge receiving chamber 221 and acoffee flow outlet 222, which are in communication, thecartridge receiving chamber 221 is a coffee brewing cartridge mounting position, thecoffee brewing cartridge 3 is positioned in thecartridge receiving chamber 221, thecartridge receiving chamber 221 extends into the base 21 from theside opening 212, and the cartridge mount can horizontally move along theside opening 212. The top of thecoffee brewing box 3 is provided with an opening for injecting high-pressure hot water into thecoffee brewing box 3, the bottom of thecoffee brewing box 3 is provided with a liquid outlet hole, and the liquid outlet hole is communicated with the boxbody accommodating cavity 221.

A yieldinggroove 213 is arranged between the base 21 and thecoffee brewing box 3, the yieldinggroove 213 is positioned on one side of the base 21 close to thebean grinding unit 5, the pressing component presses thecoffee brewing box 3 downwards, the free end of thepowder feeding pipeline 55 is pressed and deformed, and the free end of the deformedpowder feeding pipeline 55 is pressed by the pressing component into the yieldinggroove 213, so that thecoffee powder outlet 552 of thepowder feeding pipeline 55 is sealed.

Thepressing device 25 includes a sleevepressing head 251, a housing, and amotor 253. The housing includes acylinder 2521 and anupper cover 2522 mounted on an upper end portion of thecylinder 2521, and themotor 253 is mounted on amotor mount 256, and themotor mount 256 is mounted under theupper cover 2522 and within thecylinder 2521. Theupper cover 2522 is detachably mounted on thecylinder 2521, and themotor housing 256 is detachably mounted on theupper cover 2522, so that assembly and disassembly of the coffee maker are facilitated, and maintenance of the coffee maker is facilitated. The sleevepressing head 251 is installed inside thecylinder 2521, and a driving shaft of themotor 253 extends into thecylinder 2521, and a first connecting piece is fixed on the driving shaft and is ascrew head 2531.

Thesleeve press 251 has a cylindrical shape with an open top, thescrew head 2531 is screwed with the inner peripheral wall of thesleeve press 251, and thescrew head 2531 is screwed with the sleeve press and drives thesleeve press 251 to reciprocate between the press position and the release position.

Referring to fig. 1, 9 and 10, threefirst guide columns 2513 and onesecond guide column 2514 are provided on the outer circumferential wall of thesleeve press 251, four guide columns extend outward in the radial direction of thesleeve press 251, and the four guide columns are arranged in two rows along the length direction of thesleeve press 251, one row includes twofirst guide columns 2513, the other row includes onefirst guide column 2513 and onesecond guide column 2514, the two rows of guide columns are symmetrically arranged with respect to the central axis of thesleeve press 251, twoguide openings 2523 extending along the length direction of thecylinder 2521 are provided on thecylinder 2521, and the two rows of guide columns respectively move along the twoguide openings 2523. In addition, due to the arrangement of the first andsecond guide columns 2513 and 2514, thesleeve press head 251 and the housing are relatively fixed in the circumferential direction of the housing, and thesleeve press head 251 is prevented from rotating in the circumferential direction when the first andsecond guide columns 2513 and 2514 move along theguide opening 2523.

The inner peripheral wall of thecylinder 2521 is provided with afirst limit boss 2524 extending inwards from the inner peripheral wall of thecylinder 2521 in the radial direction, the outer peripheral wall of thesleeve pressing head 251 is provided with astop portion 2511, and thestop portion 2511 is adjacent to thefirst limit boss 2524; asecond limit boss 2512 is provided on the inner bottom wall of thesleeve press 251, thesecond limit boss 2512 being contiguous with the end of thescrew head 2531. The provision offirst limit boss 2524 andsecond limit boss 2512 facilitates limiting displacement ofsleeve press head 251 in the vertical direction.

The bottom wall of thesleeve pressing head 251 is provided with anupper filter screen 26, theupper filter screen 26 is arranged in an outwards convex arc shape, ascrew 28 penetrates through the center of theupper filter screen 26 to fix theupper filter screen 26 on thesleeve pressing head 251, and the periphery of theupper filter screen 26 is abutted on the bottom wall of thesleeve pressing head 251. The bottom of thesleeve pressing head 251 is abutted on the peripheral wall of thecoffee brewing box 3, the periphery of the bottom wall of thesleeve pressing head 251 is provided with anannular sealing ring 27, and theannular sealing ring 27 is tightly matched with the peripheral wall of thecoffee brewing box 3 to form a sealing part. Preferably, theseal ring 27 is made of an elastic material such as rubber.

Thesleeve pressure head 251 is provided with a water channel, the outlet of the water channel is positioned between thesleeve pressure head 251 and theupper filter screen 26, the outlet of the water channel is positioned in the middle of the sealing part, and high-pressure hot water flows through the water channel to be sprayed into thecoffee brewing box 3. The water channel includes aflow channel 254 and a plurality offlow channels 255 in communication, the plurality offlow channels 255 being arranged in a scattering pattern around thescrew 28, theflow channel 254 being located within thesecond guide column 2514 and extending in the axial direction of thesecond guide column 2514 to approximately the central axis of thesleeve head 251. Thescrew 28 comprises ahead 281 and arod 282, therod 282 is in threaded connection with thesleeve press head 251, the axial end of therod 282 is provided with ablind hole 283 which extends in the axial direction, the first end of theflow channel 254 is communicated with the outside, namely, high-pressure hot water is introduced into the brewing unit 1 from the first end of theflow channel 254 in thesecond guide post 2514, the second end of theflow channel 254 is communicated with theblind hole 283, therod 282 is further provided with a throughhole 284 which penetrates therod 282 in the radial direction, the throughhole 284 is positioned at a position close to the bottom of theblind hole 283, the throughhole 284 is communicated with theblind hole 283, the first end of theflow channel 255 is communicated with the throughhole 284, and the second end of theflow channel 255 is communicated with small holes on theupper filter screen 26. After flowing into thesleeve head 251 from the first end of theflow passage 254, the high pressure hot water flows through theblind hole 283 and the throughhole 284 in order, enters theflow passage 255 and is uniformly sprayed into thecoffee brewing cartridge 3 from the small holes in theupper filter screen 26.

As shown in fig. 6, the cartridge mount includes thecoffee flow head 23 and thehousing 24 connected, thecartridge accommodating chamber 221 is provided on thehousing 24, and the bottom wall of thecartridge accommodating chamber 221 is inclined toward theflow passage 241. Thecoffee liquid outlet 222 is arranged at the bottom of thecoffee liquid outlet 23, arunner 231 communicated with thecoffee liquid outlet 222 is arranged in thecoffee liquid outlet 23, arunner 241 communicated with therunner 231 and the boxaccommodating cavity 221 is arranged in thebase 24, therunner 241 is positioned at the bottom of the side wall of the boxaccommodating cavity 221, and the bottom wall of therunner 241 is obliquely arranged from one side of the boxaccommodating cavity 221 to one side of thecoffee liquid outlet 23 from top to bottom. The bottom wall of theflow channel 241 and the bottom wall of thecartridge housing chamber 221 are inclined so that the coffee flowing out of the outlet hole is entirely flowing to thecoffee flow outlet 222.

The coffee brewing box in fig. 11 and 12 is a coffeecapsule brewing box 4 for containing acoffee capsule 10, the coffeecapsule brewing box 4 comprises abox body 41 and acover body 42, thecylindrical cover body 42 is reversely buckled in thecylindrical box body 41, a coffee capsule containing cavity is formed by enclosing thecover body 42 and the inside of thebox body 41, apositioning part 43 is arranged on the peripheral wall of thecover body 42, thepositioning part 43 is a protrusion extending outwards from the peripheral wall of thecover body 42 along the radial direction of thecover body 42, thepositioning part 43 is positioned at the top of the peripheral wall of the containingcavity 221 of thebox body 41, and thepressing device 25 is abutted on thepositioning part 43. The outer surface oflid 42 roof is concave curved surface, the lowest position of curved surface is located the central point oflid 42 roof, the central point oflid 42 roof is equipped with high-pressure hotwater filling port 44,lid 42 roof's internal surface installspuncture sword 45, after pushing intopedestal 24 with the box body mount pad, thecasing pressure head 251 is moved downwards tomotor 253,casing pressure head 251 is contacted withlid 42 back and is pushedlid 42 and move downwards together, thereby makepuncture sword 45puncture coffee capsule 10, so that the inside of high-pressure hot water enteringcoffee capsule 10.

The operation of the coffee maker of the present invention will be described as follows.

The working method of the coffee machine comprises the following steps:

the coffee beans are placed in thebean box 52, the coffee machine is started, and the grindingunit 5 grinds the coffee beans into coffee grounds.

From the grindingchamber 511, the coffee powder enters thecoffee brewing chamber 3 through apowder feed conduit 55.

After delivering the coffee powder, themotor 253 drives thescrew head 2531 to rotate, so that thesleeve pressing head 251 is driven to move downwards, thesleeve pressing head 251 moves downwards until thesleeve pressing head 251 is tightly matched with thecoffee brewing box 3, thesleeve pressing head 251 applies pressure to the free end of thepowder delivering pipeline 55, the free end of thepowder delivering pipeline 55 is deformed, and thecoffee powder outlet 552 is sealed.

The high-pressure hot water is fed into the brewing unit 1 from the outer port of thesecond guide column 2514, flows through theflow passage 254, theblind hole 283 on thescrew 28, the throughhole 284 on thescrew 28 and theflow passage 255 in this order, and is then sprayed into thecoffee brewing chamber 3 from the small holes of theupper filter screen 26.

The brewed coffee liquid flows out from the liquid outlet hole at the bottom of thecoffee brewing box 3, flows through the boxbody accommodating cavity 221, theflow channel 241 and theflow channel 231 in sequence and flows out from thecoffee liquid outlet 222 of thecoffee liquid outlet 23, and a user can place a coffee cup below thecoffee liquid outlet 222 to take coffee liquid drink.

In addition, the first connecting piece can also be a gear, correspondingly, the pressing device also comprises a second connecting piece, the second connecting piece is a rack, the rack is fixed on the inner peripheral wall of the sleeve pressing head and extends along the axial direction parallel to the sleeve pressing head, and the gear is meshed with the rack. The free end of the deformed powder feeding duct may also be clamped between the compacting member and the peripheral wall of the coffee brewing cartridge. In addition, the powder feeding pipeline can also be formed by connecting a hard pipe made of hard materials and a hose made of flexible materials, wherein the hard pipe is used as the fixed end of the powder feeding pipeline to be fixed on the grinding body, and the hose is used as the free end of the powder feeding pipeline to extend into the coffee brewing box. The above-mentioned scheme can also achieve the object of the present invention.

From the above, the drive shaft of motor and sleeve pipe pressure head threaded connection, drive sleeve pipe pressure head reciprocating motion about the drive shaft in corotation and reversal in-process to realize sleeve pipe pressure head and compress tightly the function of coffee brewing box downwards, this closing device compares with prior art, and its simple structure is convenient for realize the automation, and easy to maintain and use moreover.

After the coffee of packaging style is put into the coffee brewing box, the coffee brewing box is installed in the box accommodating cavity of the box body installation seat, the box body installation seat is pushed to be installed in the base from the side opening of the base, and the pressing device presses downwards and abuts against the peripheral wall of the coffee brewing box. When the coffee of other packaging styles needs to be replaced, the pressing device releases the coffee brewing box, the box body mounting seat is pulled out of the base, and the coffee brewing box types are replaced after the box body mounting seat is cleaned. The exchange device of the brewing box of the coffee machine can realize multiple functions, and can brew mellow and delicious coffee in one coffee machine no matter coffee powder or coffee capsules, thereby being suitable for the requirements of different packaging modes. In addition, the pressing device is abutted on the peripheral wall of the coffee brewing box so as to press the coffee brewing box, so that the stress of the coffee brewing box is more uniform, and the coffee brewing box is prevented from being damaged.

After the coffee powder is sent to the coffee brewing box by the bean grinding unit, the pressing part moves downwards and presses the powder sending pipeline, and a coffee powder outlet at the free end of the powder sending pipeline is sealed. When the coffee powder is required to be continuously sent into the coffee brewing box, the pressing part moves upwards to enable the powder sending pipeline to recover the shape under the action of elastic restoring force, and the coffee powder outlet is opened, so that the coffee powder is sent. The compacting component is matched with the powder feeding pipeline to prevent the pipeline and coffee powder in the bean grinding cavity from being wetted and adhered.

The bean box is detachably and fixedly connected with the grinding body, so that the recovery of coffee beans in the bean box and the cleaning of the bean box can be conveniently realized. The upper bean grinding wheel is detachably and fixedly connected with the bean box, the lower bean grinding wheel is detachably and fixedly connected with the lower bean grinding wheel mounting frame, and the upper bean grinding wheel and the lower bean grinding wheel are convenient to clean and assemble. The elastic clamping device is convenient for realizing the tight fit between the bean box and the grinding body. In addition, the thickness degree of the coffee powder can be adjusted by rotating the bean box.

Finally, it should be emphasized that the foregoing description is merely illustrative of the preferred embodiments of the invention, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the invention, and any such modifications, equivalents, improvements, etc. are intended to be included within the scope of the invention.

Claims (6)

1. The coffee machine comprises a brewing unit and a bean grinding unit, wherein the brewing unit comprises a coffee brewing box and a pressing part, an opening is formed in the top of the coffee brewing box, the pressing part is located above the coffee brewing box and can move up and down along the vertical direction between a pressing position for pressing the coffee brewing box and a releasing position for releasing the coffee brewing box, when the pressing part is located at the pressing position, the bottom wall of the pressing part is tightly matched with the top end of the peripheral wall of the coffee brewing box, the bean grinding unit comprises a grinding body, a bean grinding cavity is arranged in the grinding body, and the bean grinding cavity is provided with a powder outlet;

the method is characterized in that:

the powder outlet is provided with a powder feeding pipeline, the free end of the powder feeding pipeline is made of flexible materials, the fixed end of the powder feeding pipeline is arranged on the grinding body, the powder feeding pipeline extends from the peripheral wall of the grinding body to a direction away from the grinding body, and the fixed end of the powder feeding pipeline is higher than the free end of the powder feeding pipeline;

the coffee brewing unit further comprises a base, the coffee brewing box is arranged in the base, a yielding groove is formed between the base and the coffee brewing box, and the yielding groove is located at one side, close to the bean grinding unit, of the base;

when the pressing part is positioned at the pressing position, the pressing part drives the free end of the powder feeding pipeline to deform, and the deformed free end of the powder feeding pipeline is extruded into the abdication groove so as to enable a coffee powder outlet at the free end of the powder feeding pipeline to be closed;

when the pressing part is at the loosening position, the powder feeding pipeline restores the shape under the action of elastic restoring force, and the free end of the powder feeding pipeline stretches to the opening of the coffee brewing box.

2. A coffee machine as claimed in claim 1, characterized in that:

the bean grinding unit further comprises a bean box, the bean box comprises a barrel body and an installation part located at one axial end of the barrel body, the installation part is connected with the grinding body through threads, an elastic clamping device is arranged on the barrel body, one end of the elastic clamping device is fixed on the barrel body, and the other end of the elastic clamping device is abutted to the grinding body.

3. A coffee machine as claimed in claim 2, characterized in that:

the elastic clamping device comprises a cover part, an elastic piece and a fixed column, wherein the cylinder body is provided with a mounting groove, the elastic piece and the fixed column are positioned in the mounting groove, and the cover part is mounted on the top wall of the mounting groove; the two ends of the elastic piece are respectively abutted to the cover part and the fixed column, the bottom end of the fixed column is provided with a columnar abutting part, the diameter of the abutting part is smaller than that of the fixed column, and the abutting part penetrates through the bottom wall of the mounting groove and abuts against the grinding body.

4. A coffee machine as claimed in claim 3, characterized in that:

the top wall of the grinding body is provided with a plurality of positioning grooves which are uniformly distributed along the circumferential direction of the grinding body, the abutting part is abutted in one of the positioning grooves, the outer circumferential wall of the cylinder body, which is close to one end of the mounting part, is provided with a stop part which extends outwards along the radial direction of the cylinder body, and the stop part covers the upper part of the positioning groove.

5. Coffee machine according to any one of claims 2 to 4, characterized in that:

the bean grinding unit further comprises a motor and an upper bean grinding wheel, a lower bean grinding wheel and a lower bean grinding wheel mounting frame which are coaxially arranged, wherein the motor is arranged below the bean grinding cavity, a driving shaft of the motor stretches into the bean grinding cavity, the upper bean grinding wheel, the lower bean grinding wheel and the lower bean grinding wheel mounting frame are positioned in the bean grinding cavity, the lower bean grinding wheel mounting frame is fixedly connected with the driving shaft, the upper bean grinding wheel is fixed at the bottom of the mounting part, and the lower bean grinding wheel is fixed on the lower bean grinding wheel mounting frame.

6. A method of operating a coffee machine, characterized in that the coffee machine is a coffee machine according to any one of claims 1 to 5, the method comprising the steps of:

the bean grinding unit grinds coffee beans into coffee powder;

the coffee powder enters the coffee brewing box from the bean grinding cavity through the powder feeding pipeline;

the pressing part moves downwards until the pressing part is tightly matched with the coffee brewing box, the pressing part applies pressure to the free end of the powder feeding pipeline, the free end of the powder feeding pipeline is deformed, and the coffee powder outlet is sealed;

high pressure hot water is injected into the coffee brewing cartridge.

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