Grinding powder screening device, coffee machine, tea extractor and powder screening method

Abstract

The present invention discloses a grinding powder screening device, a coffee machine, a tea extractor and a powder screening method, wherein the grinding powder screening device comprises: a powder falling chamber; a plurality of powder screening components for screening powders of different coarseness and fineness, each of the powder screening components being arranged in a vertical direction, each of the powder screening components being movably arranged and switched to move below the powder falling chamber; a driving mechanism, wherein the driving mechanism is connected to the powder screening component and drives the powder screening component to vibrate. The present invention can match different extracts by switching a plurality of powder screening components, thereby screening out the correspondingly generated ultrafine powder or achieving other screening requirements. This improves the uniformity of the ground powder, reduces blockage, and improves the taste and appearance of the extract.

Description

Technical Field

[0001] The invention relates to a grinding powder screening device, a coffee machine, a tea extractor and a powder screening method. Background Art

[0002] In the prior art, the grinding structure of fully automatic coffee machines or tea extractors is not fully compatible with the grinding of tea leaves and coffee. Moreover, even if only coffee or tea leaves are ground, the grinding degree may not be uniform due to the different types of tea leaves or coffee, thus producing ultra-fine particles, which may cause blockage risks in the tea and coffee extraction steps, and after extraction, the tea and coffee liquid may become turbid and the taste may be affected. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the technical problems in the prior art that the grinding device cannot adapt to different types of extracts, the grinding degree is uneven, and ultrafine particles are easily generated, causing blockage and affecting the taste and appearance.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A grinding powder screening device, characterized in that the grinding powder screening device comprises:

[0006] Powder dropping chamber;

[0007] A plurality of powder screening components are used for screening powders of different coarseness and fineness, each of the powder screening components is arranged in a vertical direction, and each of the powder screening components is movably arranged and switched to move below the powder falling chamber;

[0008] A driving mechanism is connected to the powder screening component and drives the powder screening component to vibrate.

[0009] In this solution, by switching between multiple powder screening components, different extracts can be matched, thereby screening out the corresponding ultrafine powders. Among them, by using powder screening components of different coarseness and fineness, the required powder coarseness and fineness can be accurately obtained, including removing finer powder to obtain coarser powder; removing coarser powder to obtain finer powder; removing coarser and finer powders and retaining moderate powder. The driving mechanism can shake the powder screening component to achieve automatic powder screening.

[0010] Preferably, the powder screening component is switched and moved to the bottom of the powder falling chamber by rotating. The moving path occupied by the powder screening component in and out by rotating is short, which can effectively save internal space.

[0011] Preferably, the powder screening component is connected to a switching shaft component extending in a vertical direction, and rotates around the switching shaft component to move below the powder falling chamber. Thus, the switching paths of the powder screening components are staggered in space, avoiding the influence of the mutual movement of the powder screening components. At the same time, the powder screening components can be switched through the same switching shaft component, simplifying the structure.

[0012] Preferably, the grinding powder screening device further comprises a limit shaft assembly, which is arranged on the moving path of the powder screening assembly, and blocks the further movement of the powder screening assembly after switching to the bottom of the powder falling chamber. The limit shaft assembly positions the powder screening assembly to ensure that the powder screening assembly will not miss the position below the powder falling chamber during movement.

[0013] Preferably, the driving mechanism includes a cam assembly, one end of the switching shaft assembly contacts the cam assembly and moves up and down with the rotation of the cam assembly. The eccentric surface track of the cam passing edge can be set to have an undulating change, thereby driving the switching shaft assembly to shake. At the same time, the switching shaft assembly not only realizes the switching of the powder screening assembly, but also plays a role in driving the shaking, thereby achieving full utilization of the structure.

[0014] Preferably, the grinding powder screening device further comprises a limit shaft assembly, which is arranged on the moving path of the powder screening assembly and is detachably engaged with the powder screening assembly switched to the bottom of the powder falling chamber. The limit shaft assembly is engaged with the powder screening assembly to prevent the powder screening assembly under the powder falling chamber from moving when it is shaken. At the same time, the limit shaft assembly supports one end of the powder screening assembly, thereby improving the strength of the powder screening assembly and preventing the powder screening assembly from shaking violently and spilling powder uncontrollably.

[0015] Preferably, the cam assembly includes two cam elements connected to each other, and one end of the limit shaft assembly and the switching shaft assembly are respectively in contact with the two cam elements, and move up and down together with the rotation of the two cam elements. The cam elements on both sides enable the limit shaft assembly and the switching shaft assembly to move together on both sides, thereby ensuring that the rotating end and the buckling end of the powder screening assembly can move synchronously, improving strength and avoiding uncontrolled movement.

[0016] Preferably, the limit shaft assembly includes a limit slide bar in contact with the cam element and a limit sleeve sleeved on the limit slide bar, the switching shaft assembly includes a switching slide bar in contact with the cam element and a switching sleeve sleeved on the switching slide bar, the limit sleeve is detachably engaged with the powder screening assembly, and the powder screening assembly is rotatably connected with the switching sleeve, wherein a return element is provided between the switching slide bar and the switching sleeve, and / or a return element is provided between the limit slide bar and the limit sleeve. The return element can be a spring or other element, and the return element absorbs the vibration generated by the up and down movement by stretching and contracting, so that the powder screening process is smoother.

[0017] Preferably, the limiting sleeve and the switching sleeve are connected as one body. The limiting sleeve and the switching sleeve connected as one body can move stably, so that both ends of the powder screening component can vibrate synchronously and cooperatively.

[0018] Preferably, the grinding powder screening device further comprises a powder unloading mechanism, each of the powder screening components comprises a bracket and a screen, the screen is flippable relative to the bracket, and the powder unloading mechanism is used to drive the screen to flip.

[0019] Preferably, the powder unloading mechanism is detachably connected to the screen, wherein the powder unloading mechanism is connected to the screen moved to the bottom of the powder dropping chamber and drives the corresponding screen to flip, and the powder unloading mechanism is disconnected from the screen moved out from the bottom of the powder dropping chamber. Thus, the powder screening assembly ensures that only the screen located under the powder dropping chamber can be unloaded, avoiding incorrect powder unloading.

[0020] Preferably, the powder unloading mechanism includes a rack extending in a vertical direction, each of the screens has a flip shaft, one end of the flip shaft is connected to a gear exposed outside the bracket, and the rack meshes with the gear and drives the screen to flip. The rack and the gear can smoothly screen the powder, and it is also conducive to accurately controlling the flip angle.

[0021] Preferably, the grinding powder screening device further includes a powder receiving box and a waste box, and the powder receiving box and the waste box are switched and moved to the bottom of the powder screening assembly located below the powder falling chamber. Thus, the waste box and the powder receiving box alternately receive the corresponding powder, so as to realize the automatic connection with the subsequent extraction process.

[0022] Preferably, the grinding powder screening device further comprises:

[0023] An image recognition component, wherein the image recognition component is disposed at a feed port of the grinding device;

[0024] A control unit controls the corresponding powder screening assembly to switch into or out of the bottom of the powder falling chamber, and controls the operation of the driving mechanism.

[0025] Through the image recognition component and the control unit, different powder screening components can be automatically selected according to different grinding objects, so as to carry out targeted powder screening.

[0026] Preferably, the grinding powder screening device also includes a waste box, wherein when the driving mechanism is working, the control unit switches and moves the waste box to below the powder screening assembly located below the powder falling chamber.

[0027] Preferably, the grinding powder screening device also includes a powder receiving box and a powder unloading mechanism, wherein the powder unloading mechanism is used to unload the powder on the powder screening assembly, wherein when the powder unloading mechanism is working, the control unit switches and moves the powder receiving box to the bottom of the powder screening assembly located below the powder dropping chamber.

[0028] Preferably, a gravity sensor is provided below the powder receiving box, and the control unit starts the grinding device according to a signal from the gravity sensor.

[0029] A coffee machine is characterized in that the coffee machine comprises the ground powder screening device.

[0030] A tea leaf extractor is characterized in that the tea leaf extractor comprises the grinding powder screening device.

[0031] A powder screening method, characterized in that the powder screening method comprises the following steps:

[0032] Identify the extracted object through an image recognition component;

[0033] The grinding device grinds and delivers the powder into the powder dropping chamber;

[0034] Select the corresponding powder screening component and move it to the bottom of the powder dropping chamber to receive the powder;

[0035] The driving mechanism drives the powder screening component to move to screen the powder, and moves the component into the waste box to receive the screened powder;

[0036] The powder unloading mechanism drives the powder screening component to unload the screened powder and move it into the powder receiving box to receive the powder;

[0037] The gravity sensor of the powder receiving box reads the gravity and selects the grinding device to continue grinding or stop.

[0038] A powder screening method, characterized in that the powder screening method comprises the following steps:

[0039] Identify the extracted object through an image recognition component;

[0040] The grinding device grinds and delivers the powder into the powder dropping chamber;

[0041] Select the corresponding powder screening component and move it to the bottom of the powder dropping chamber to receive the powder;

[0042] The driving mechanism drives the powder screening component to move to screen the powder, and moves into the powder receiving box to receive the screened powder;

[0043] The gravity sensor of the powder receiving box reads the gravity and selects the grinding device to continue grinding or stop;

[0044] The powder unloading mechanism drives the powder screening assembly to unload the screened powder and move it into the waste box to receive the powder.

[0045] A powder screening method, characterized in that the powder screening method comprises the following steps:

[0046] Identify the extracted object through an image recognition component;

[0047] The grinding device grinds and delivers the powder into the powder dropping chamber;

[0048] Select a coarser powder screening component and move it to the bottom of the powder falling chamber to receive powder, and move a finer powder screening component to the bottom of the coarser powder screening component to receive powder;

[0049] The driving mechanism drives the coarser powder screening component and the finer powder screening component to move to screen the powder, and moves the waste box to receive the screened powder;

[0050] The powder unloading mechanism drives the powder screening assembly to unload the retained powder in the finer powder screening assembly and move it into the powder receiving box to receive the powder, and / or the powder unloading mechanism drives the powder screening assembly to unload the retained powder in the coarser powder screening assembly and move it into the waste box to receive the powder.

[0051] The gravity sensor of the powder receiving box reads the gravity and selects the grinding device to continue grinding or stop.

[0052] The positive improvement effect of the present invention is that the present invention can match different extracts by switching multiple powder screening components, thereby screening out the corresponding ultrafine powder or achieving other screening requirements. This improves the uniformity of the ground powder, reduces blockage, and improves the taste and appearance of the extract. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a three-dimensional structural schematic diagram of a grinding powder screening device according to a preferred embodiment of the present invention.

[0054] Figure 2 Another schematic diagram of the three-dimensional structure of the grinding powder screening device according to a preferred embodiment of the present invention.

[0055] Figure 3It is a schematic diagram of the partial structure of the grinding powder screening device according to a preferred embodiment of the present invention.

[0056] Figure 4 It is a schematic structural diagram of a limit shaft assembly and a switching shaft assembly according to a preferred embodiment of the present invention.

[0057] Figure 5 The figure is a flow chart of a first powder screening method according to a preferred embodiment of the present invention.

[0058] Figure 6 The figure is a flow chart of a second powder screening method according to a preferred embodiment of the present invention.

[0059] Figure 7 The figure is a flow chart of a third powder screening method according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0060] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0061] like Figure 1-Figure 4 As shown, this embodiment discloses a grinding powder screening device, which includes a powder falling chamber 1 and a plurality of powder screening components 2 for screening powder of different coarseness and fineness, each powder screening component 2 is arranged in a vertical direction, and each powder screening component 2 is movably arranged and switched to move below the powder falling chamber 1. The grinding powder screening device of this embodiment also includes a driving mechanism, which is connected to the powder screening component 2 and drives the powder screening component 2 to vibrate. In this embodiment, a cam assembly 6 is used as a driving mechanism, and in other embodiments, other mechanisms for generating movement may also be used.

[0062] like Figure 1-Figure 4 As shown, the powder screening component 2 of this embodiment is switched and moved to the bottom of the powder falling chamber 1 by rotating. The moving path occupied by the powder screening component 2 moving in and out by rotating is short, which can effectively save internal space.

[0063] like Figure 1 and Figure 2 As shown, the powder screening component 2 of this embodiment is connected to a switching shaft component 3 extending in a vertical direction, and rotates around the switching shaft component 3 to move to the bottom of the powder falling chamber 1. As a result, the switching paths of the powder screening components 2 are staggered in space to avoid the influence of the mutual movement of the powder screening components 2. At the same time, the powder screening components 2 can be switched through the same switching shaft component 3, simplifying the structure.

[0064] like Figure 1 and Figure 2As shown, the grinding powder screening device of this embodiment further includes a limit shaft assembly 4, which is arranged on the moving path of the powder screening assembly 2, and the limit shaft assembly 4 blocks the further movement of the powder screening assembly 2 switched to the bottom of the powder falling chamber 1. The limit shaft assembly 4 positions the powder screening assembly 2 to ensure that the powder screening assembly 2 will not miss the position below the powder falling chamber 1 during movement.

[0065] like Figure 1 and Figure 2 As shown, the driving mechanism of this embodiment includes a cam assembly 6, one end of the switching shaft assembly 3 contacts the cam assembly 6, and moves up and down with the rotation of the cam assembly 6. The eccentric surface track of the cam passing edge can be set to have an undulating change, thereby driving the switching shaft assembly 3 to shake, and at the same time, the switching shaft assembly 3 plays a role in driving the shaking while realizing the switching of the powder screening assembly 2, realizing full utilization of the structure.

[0066] like Figure 1 and Figure 2 As shown, the limiting shaft assembly 4 of this embodiment is arranged on the moving path of the powder screening assembly 2 and is detachably engaged with the powder screening assembly 2 switched to the bottom of the powder falling chamber 1. The limiting shaft assembly 4 is engaged with the powder screening assembly 2 to prevent the powder screening assembly 2 under the powder falling chamber 1 from moving when shaking. At the same time, the limiting shaft assembly 4 supports one end of the powder screening assembly 2, improves the strength of the powder screening assembly 2, and prevents the powder screening assembly 2 from shaking violently and spilling powder uncontrollably.

[0067] like Figure 1-Figure 3 As shown, the cam assembly 6 of this embodiment includes two cam elements 61 connected to each other, and one end of the limit shaft assembly 4 and the switching shaft assembly 3 are respectively in contact with the two cam elements 61, and move up and down together with the rotation of the two cam elements 61. The cam elements 61 on both sides enable the limit shaft assembly 4 and the switching shaft assembly 3 to move together on both sides, thereby ensuring that the rotating end and the snap-fit ​​end of the powder screening assembly 2 can move synchronously, improve strength, and avoid uncontrolled movement. The cam elements 61 on both sides in this embodiment can have a consistent outer contour so that the shaking on both sides is consistent. It can also have an inconsistent outer contour so that the two sides produce shaking in different directions.

[0068] like Figure 3 and Figure 4As shown, the limit shaft assembly 4 of this embodiment includes a limit slide bar 41 in contact with the cam element 61 and a limit shaft sleeve 42 sleeved on the limit slide bar 41, the switching shaft assembly 3 includes a switching slide bar 31 in contact with the cam element 61 and a switching shaft sleeve 32 sleeved on the switching slide bar 31, the limit shaft sleeve 42 is detachably engaged with the powder screening assembly 2, and the powder screening assembly 2 is rotatably connected with the switching shaft sleeve 32, wherein a return element 5 is provided between the switching slide bar 31 and the switching shaft sleeve 32, and / or a return element 5 is provided between the limit slide bar 41 and the limit shaft sleeve 42. The return element 5 can be a spring or other element, and the return element 5 absorbs the vibration generated by the up and down movement by stretching and contracting, so that the powder screening process is smoother.

[0069] like Figure 3 and Figure 4 As shown, the limiting sleeve 42 and the switching sleeve 32 of this embodiment are independently provided. In other embodiments, the limiting sleeve 42 and the switching sleeve 32 can be connected as one. The limiting sleeve 42 and the switching sleeve 32 connected as one can move stably, so that both ends of the powder screening component 2 can generate shaking synchronously and cooperatively.

[0070] like Figure 4 As shown, the grinding powder screening device of this embodiment further includes a powder unloading mechanism 7. Each powder screening assembly 2 includes a bracket 21 and a screen 22. The screen 22 is flippable relative to the bracket 21. The powder unloading mechanism 7 is used to drive the screen 22 to flip.

[0071] like Figure 3 and Figure 4 As shown, the powder unloading mechanism 7 of this embodiment is detachably connected to the screen 22, wherein the powder unloading mechanism 7 is connected to the screen 22 moved to the bottom of the powder dropping chamber 1 and drives the corresponding screen 22 to flip, and the powder unloading mechanism 7 is disconnected from the screen 22 moved out from the bottom of the powder dropping chamber 1. Thus, the powder screening assembly ensures that powder can only be unloaded from the screen 22 located under the powder dropping chamber 1, avoiding incorrect powder unloading.

[0072] like Figure 4 As shown, the powder unloading mechanism 7 of this embodiment includes a rack extending in the vertical direction, each screen 22 has a flip shaft, one end of the flip shaft is connected to a gear exposed outside the bracket 21, and the rack meshes with the gear and drives the screen 22 to flip. The rack and the gear can smoothly screen the powder, which is also conducive to accurately controlling the flip angle.

[0073] like Figure 1 and Figure 3As shown, the grinding powder screening device of this embodiment also includes a powder receiving box 82 and a waste box 83, and the powder receiving box 82 and the waste box 83 are switched and moved to the bottom of the powder screening assembly 2 located below the powder falling chamber 1. Thus, the waste box 83 and the powder receiving box 82 alternately receive the corresponding powder, and the subsequent extraction process is automatically connected.

[0074] like Figure 1 As shown, the grinding powder screening device also includes an image recognition component 81, which is arranged at the feed port of the grinding device 9. The grinding powder screening device of this embodiment also includes a control unit, which controls the corresponding powder screening component to switch into or out of the bottom of the powder falling chamber 1, and controls the operation of the driving mechanism. Through the image recognition component 81 and the control unit, different powder screening components 2 can be automatically selected according to different grinding objects, so as to perform targeted powder screening.

[0075] Furthermore, in this embodiment, when the driving mechanism is working, the control unit switches the waste box 83 to the bottom of the powder screening assembly 2 located below the powder falling chamber 1. The powder unloading mechanism 7 is used to unload the powder on the powder screening assembly, wherein, when the powder unloading mechanism 7 is working, the control unit switches the powder receiving box 82 to the bottom of the powder screening assembly 2 located below the powder falling chamber 1. A gravity sensor 84 is provided below the powder receiving box 82, and the control unit starts the grinding device 9 according to the signal of the gravity sensor 84.

[0076] In this embodiment, the switching of multiple powder screening components 2 can match different extracts, thereby screening out the corresponding ultrafine powder. Among them, through the powder screening components 2 of different coarseness and fineness, the required powder coarseness and fineness can be accurately obtained, including removing finer powder to obtain coarser powder; removing coarser powder to obtain finer powder; removing coarser and finer powders and retaining moderate powder. The driving mechanism can shake the powder screening component 2 to achieve automatic powder screening.

[0077] In addition, the grinding powder screening device of this embodiment can be used in a coffee machine or a tea extraction machine, or can be a device that can extract both.

[0078] like Figure 5 As shown, this embodiment discloses a first powder screening method, which includes the following steps:

[0079] S101, identifying the object to be extracted by the image recognition component 81;

[0080] S102, the grinding device 9 grinds and delivers the powder into the powder dropping chamber 1;

[0081] S103, selecting a corresponding powder screening component 2 and moving it to the bottom of the powder dropping chamber 1 to receive powder;

[0082] S104, the driving mechanism drives the powder screening component 2 to move to screen the powder, and moves it into the waste box 83 to receive the screened powder;

[0083] S105, the powder unloading mechanism 7 drives the powder screening assembly 2 to unload the screened powder and move it into the powder receiving box 82 to receive the powder;

[0084] S106, the gravity sensor 84 of the powder receiving box 82 reads the gravity and selects the grinding device 9 to continue grinding or stop.

[0085] like Figure 6 As shown, this embodiment discloses a second powder screening method, which includes the following steps:

[0086] S201, identifying the object to be extracted by the image recognition component 81;

[0087] S202, the grinding device 9 grinds and delivers the powder into the powder dropping chamber 1;

[0088] S203, selecting a corresponding powder screening component 2 and moving it to the bottom of the powder dropping chamber 1 to receive powder;

[0089] S204, the driving mechanism drives the powder screening component 2 to move to screen the powder, and moves into the powder receiving box 82 to receive the screened powder;

[0090] S205, the gravity sensor 84 of the powder receiving box 82 reads the gravity and selects the grinding device 9 to continue grinding or stop;

[0091] S206, the powder unloading mechanism 7 drives the powder screening assembly 2 to unload the screened powder and move it into the waste box 83 to receive the powder.

[0092] like Figure 7 As shown, this embodiment discloses a third powder screening method, which includes the following steps:

[0093] S301, identifying the object to be extracted by the image recognition component 81;

[0094] S302, the grinding device 9 grinds and delivers the powder into the powder dropping chamber 1;

[0095] S303, select a coarser powder screening component 2 to move to the bottom of the powder falling chamber 1 to receive powder, and a finer powder screening component 2 to move to the bottom of the coarser powder screening component 2 to receive powder;

[0096] S304, the driving mechanism drives the coarser powder screening component 2 and the finer powder screening component 2 to move to screen the powder, and move the waste box 83 to receive the screened powder;

[0097] S305 , the powder unloading mechanism 7 drives the powder screening component 2 to unload the finer powder in the powder screening component 2 and move it into the powder receiving box 82 to receive the powder.

[0098] S306, the gravity sensor 84 of the powder receiving box 82 reads the gravity and selects the grinding device 9 to continue grinding or stop.

[0099] S307, the powder unloading mechanism 7 drives the powder screening component 2 to unload the coarser powder screened and retained in the powder screening component 2, and moves the powder into the waste box 83 to receive the powder.

[0100] Among them, step S305 and step S07 are performed separately.

[0101] The present invention can match different extracts by switching multiple powder screening components, thereby screening out the corresponding ultrafine powder or achieving other screening requirements, thereby improving the uniformity of the ground powder, reducing blockage, and improving the taste and appearance of the extract.

[0102] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A grinding powder screening device, characterized in that: The grinding powder screening device comprises: Powder dropping chamber; A plurality of powder screening assemblies, used for screening powder of different coarseness and fineness, each of the powder screening assemblies is arranged in a vertical direction, each of the powder screening assemblies is movably arranged and switched to move below the powder falling chamber, the powder screening assemblies are switched to move below the powder falling chamber by rotating, the powder screening assemblies are connected to a switching shaft assembly extending in a vertical direction, and rotate around the switching shaft assembly to move below the powder falling chamber; A driving mechanism, the driving mechanism is connected to the powder screening assembly and drives the powder screening assembly to shake, the driving mechanism includes a cam assembly, one end of the switching shaft assembly contacts the cam assembly and moves up and down with the rotation of the cam assembly, and the cam assembly includes two cam elements connected to each other; A limiting shaft assembly, one end of the limiting shaft assembly and the switching shaft assembly are respectively in contact with the two cam elements, and move up and down together with the rotation of the two cam elements, the limiting shaft assembly is arranged on the moving path of the powder screening assembly and is detachably engaged with the powder screening assembly switched to the bottom of the powder falling chamber, the limiting shaft assembly blocks the further movement of the powder screening assembly switched to the bottom of the powder falling chamber, the limiting shaft assembly includes a limiting slide bar in contact with the cam element and a limiting shaft sleeve sleeved on the limiting slide bar, the switching shaft assembly includes a switching slide bar in contact with the cam element and a switching shaft sleeve sleeved on the switching slide bar, the limiting shaft sleeve is detachably engaged with the powder screening assembly, and the powder screening assembly is rotatably connected with the switching shaft sleeve, wherein a return element is arranged between the switching slide bar and the switching shaft sleeve, and / or a return element is arranged between the limiting slide bar and the limiting shaft sleeve, The grinding powder screening device also includes an image recognition component, which is arranged at the feed port of the grinding device. The grinding powder screening device also includes a control unit, which controls the corresponding powder screening component to switch in or out of the bottom of the powder falling chamber and controls the operation of the driving mechanism. Through the image recognition component and the control unit, different powder screening components can be automatically selected according to different grinding objects.

2. The grinding powder screening device according to claim 1, characterized in that: The limiting shaft sleeve and the switching shaft sleeve are connected as one body.

3. The grinding powder screening device according to claim 1, characterized in that: The grinding powder screening device also includes a powder unloading mechanism, each of the powder screening components includes a bracket and a screen, the screen is flippable relative to the bracket, and the powder unloading mechanism is used to drive the screen to flip.

4. The grinding powder screening device according to claim 3, characterized in that: The powder unloading mechanism is detachably connected to the screen, wherein the powder unloading mechanism is connected to the screen moved to the bottom of the powder dropping chamber and drives the corresponding screen to flip, and the powder unloading mechanism is disconnected from the screen moved out from under the powder dropping chamber.

5. The grinding powder screening device according to claim 3, characterized in that: The powder unloading mechanism includes a rack extending in a vertical direction, each of the screens has a flip shaft, one end of the flip shaft is connected to a gear exposed outside the bracket, and the rack meshes with the gear and drives the screen to flip.

6. The grinding powder screening device according to claim 1, characterized in that: The grinding powder screening device also includes a powder receiving box and a waste box. The powder receiving box and the waste box are switched and moved to the bottom of the powder screening assembly located below the powder falling chamber.

7. The grinding powder screening device according to claim 1, characterized in that: The grinding powder screening device also includes a waste box, wherein when the driving mechanism is working, the control unit switches and moves the waste box to below the powder screening assembly located below the powder falling chamber.

8. The grinding powder screening device according to claim 1 or 7, characterized in that: The grinding powder screening device also includes a powder receiving box and a powder unloading mechanism, wherein the powder unloading mechanism is used to unload the powder on the powder screening assembly, wherein when the powder unloading mechanism is working, the control unit switches and moves the powder receiving box to the bottom of the powder screening assembly located below the powder dropping chamber.

9. The grinding powder screening device according to claim 8, characterized in that: A gravity sensor is arranged below the powder receiving box, and the control unit starts the grinding device according to a signal from the gravity sensor.

10. A coffee machine, characterized in that: The coffee machine comprises a ground powder screening device as claimed in any one of claims 1-9.

11. A tea extractor, characterized in that: The tea extractor comprises a grinding powder screening device as described in any one of claims 1-9.

12. A method for sieving flour, characterized in that: The powder screening method is implemented using the grinding powder screening device according to any one of claims 1 to 9, comprising the following steps: Identify the extracted object through an image recognition component; The grinding device grinds and delivers the powder into the powder dropping chamber; Select the corresponding powder screening component and move it to the bottom of the powder dropping chamber to receive the powder; The driving mechanism drives the powder screening component to move to screen the powder, and moves the component into the waste box to receive the screened powder; The powder unloading mechanism drives the powder screening component to unload the screened powder and move it into the powder receiving box to receive the powder; The gravity sensor of the powder receiving box reads the gravity and selects the grinding device to continue grinding or stop.

13. A method for sieving flour, characterized in that: The powder screening method is implemented using the grinding powder screening device according to any one of claims 1 to 9, comprising the following steps: Identify the extracted object through an image recognition component; The grinding device grinds and delivers the powder into the powder dropping chamber; Select the corresponding powder screening component and move it to the bottom of the powder dropping chamber to receive the powder; The driving mechanism drives the powder screening component to move to screen the powder, and moves into the powder receiving box to receive the screened powder; The gravity sensor of the powder receiving box reads the gravity and selects the grinding device to continue grinding or stop; The powder unloading mechanism drives the powder screening assembly to unload the screened powder and move it into the waste box to receive the powder.

14. A method for sieving flour, characterized in that: The powder screening method is implemented using the grinding powder screening device according to any one of claims 1 to 9, comprising the following steps: Identify the extracted object through an image recognition component; The grinding device grinds and delivers the powder into the powder dropping chamber; Select a coarser powder screening component and move it to the bottom of the powder falling chamber to receive powder, and move a finer powder screening component to the bottom of the coarser powder screening component to receive powder; The driving mechanism drives the coarser powder screening component and the finer powder screening component to move to screen the powder, and moves the waste box to receive the screened powder; The powder unloading mechanism drives the powder screening component to unload the sieved powder in the finer powder screening component and move it into the powder receiving box to receive the powder, and / or the powder unloading mechanism drives the powder screening component to unload the sieved powder in the coarser powder screening component and move it into the waste box to receive the powder; The gravity sensor of the powder receiving box reads the gravity and selects the grinding device to continue grinding or stop.

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